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0001 /*
0002  *  fs/nfs/nfs4proc.c
0003  *
0004  *  Client-side procedure declarations for NFSv4.
0005  *
0006  *  Copyright (c) 2002 The Regents of the University of Michigan.
0007  *  All rights reserved.
0008  *
0009  *  Kendrick Smith <kmsmith@umich.edu>
0010  *  Andy Adamson   <andros@umich.edu>
0011  *
0012  *  Redistribution and use in source and binary forms, with or without
0013  *  modification, are permitted provided that the following conditions
0014  *  are met:
0015  *
0016  *  1. Redistributions of source code must retain the above copyright
0017  *     notice, this list of conditions and the following disclaimer.
0018  *  2. Redistributions in binary form must reproduce the above copyright
0019  *     notice, this list of conditions and the following disclaimer in the
0020  *     documentation and/or other materials provided with the distribution.
0021  *  3. Neither the name of the University nor the names of its
0022  *     contributors may be used to endorse or promote products derived
0023  *     from this software without specific prior written permission.
0024  *
0025  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
0026  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
0027  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
0028  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
0029  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
0030  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
0031  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
0032  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
0033  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
0034  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
0035  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
0036  */
0037 
0038 #include <linux/mm.h>
0039 #include <linux/delay.h>
0040 #include <linux/errno.h>
0041 #include <linux/string.h>
0042 #include <linux/ratelimit.h>
0043 #include <linux/printk.h>
0044 #include <linux/slab.h>
0045 #include <linux/sunrpc/clnt.h>
0046 #include <linux/nfs.h>
0047 #include <linux/nfs4.h>
0048 #include <linux/nfs_fs.h>
0049 #include <linux/nfs_page.h>
0050 #include <linux/nfs_mount.h>
0051 #include <linux/namei.h>
0052 #include <linux/mount.h>
0053 #include <linux/module.h>
0054 #include <linux/xattr.h>
0055 #include <linux/utsname.h>
0056 #include <linux/freezer.h>
0057 #include <linux/iversion.h>
0058 
0059 #include "nfs4_fs.h"
0060 #include "delegation.h"
0061 #include "internal.h"
0062 #include "iostat.h"
0063 #include "callback.h"
0064 #include "pnfs.h"
0065 #include "netns.h"
0066 #include "sysfs.h"
0067 #include "nfs4idmap.h"
0068 #include "nfs4session.h"
0069 #include "fscache.h"
0070 #include "nfs42.h"
0071 
0072 #include "nfs4trace.h"
0073 
0074 #define NFSDBG_FACILITY     NFSDBG_PROC
0075 
0076 #define NFS4_BITMASK_SZ     3
0077 
0078 #define NFS4_POLL_RETRY_MIN (HZ/10)
0079 #define NFS4_POLL_RETRY_MAX (15*HZ)
0080 
0081 /* file attributes which can be mapped to nfs attributes */
0082 #define NFS4_VALID_ATTRS (ATTR_MODE \
0083     | ATTR_UID \
0084     | ATTR_GID \
0085     | ATTR_SIZE \
0086     | ATTR_ATIME \
0087     | ATTR_MTIME \
0088     | ATTR_CTIME \
0089     | ATTR_ATIME_SET \
0090     | ATTR_MTIME_SET)
0091 
0092 struct nfs4_opendata;
0093 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
0094 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
0095 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
0096 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
0097                   struct nfs_fattr *fattr, struct inode *inode);
0098 static int nfs4_do_setattr(struct inode *inode, const struct cred *cred,
0099                 struct nfs_fattr *fattr, struct iattr *sattr,
0100                 struct nfs_open_context *ctx, struct nfs4_label *ilabel);
0101 #ifdef CONFIG_NFS_V4_1
0102 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
0103         const struct cred *cred,
0104         struct nfs4_slot *slot,
0105         bool is_privileged);
0106 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *,
0107         const struct cred *);
0108 static int nfs41_free_stateid(struct nfs_server *, const nfs4_stateid *,
0109         const struct cred *, bool);
0110 #endif
0111 
0112 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
0113 static inline struct nfs4_label *
0114 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
0115     struct iattr *sattr, struct nfs4_label *label)
0116 {
0117     int err;
0118 
0119     if (label == NULL)
0120         return NULL;
0121 
0122     if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL) == 0)
0123         return NULL;
0124 
0125     err = security_dentry_init_security(dentry, sattr->ia_mode,
0126                 &dentry->d_name, NULL,
0127                 (void **)&label->label, &label->len);
0128     if (err == 0)
0129         return label;
0130 
0131     return NULL;
0132 }
0133 static inline void
0134 nfs4_label_release_security(struct nfs4_label *label)
0135 {
0136     if (label)
0137         security_release_secctx(label->label, label->len);
0138 }
0139 static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
0140 {
0141     if (label)
0142         return server->attr_bitmask;
0143 
0144     return server->attr_bitmask_nl;
0145 }
0146 #else
0147 static inline struct nfs4_label *
0148 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
0149     struct iattr *sattr, struct nfs4_label *l)
0150 { return NULL; }
0151 static inline void
0152 nfs4_label_release_security(struct nfs4_label *label)
0153 { return; }
0154 static inline u32 *
0155 nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
0156 { return server->attr_bitmask; }
0157 #endif
0158 
0159 /* Prevent leaks of NFSv4 errors into userland */
0160 static int nfs4_map_errors(int err)
0161 {
0162     if (err >= -1000)
0163         return err;
0164     switch (err) {
0165     case -NFS4ERR_RESOURCE:
0166     case -NFS4ERR_LAYOUTTRYLATER:
0167     case -NFS4ERR_RECALLCONFLICT:
0168         return -EREMOTEIO;
0169     case -NFS4ERR_WRONGSEC:
0170     case -NFS4ERR_WRONG_CRED:
0171         return -EPERM;
0172     case -NFS4ERR_BADOWNER:
0173     case -NFS4ERR_BADNAME:
0174         return -EINVAL;
0175     case -NFS4ERR_SHARE_DENIED:
0176         return -EACCES;
0177     case -NFS4ERR_MINOR_VERS_MISMATCH:
0178         return -EPROTONOSUPPORT;
0179     case -NFS4ERR_FILE_OPEN:
0180         return -EBUSY;
0181     case -NFS4ERR_NOT_SAME:
0182         return -ENOTSYNC;
0183     default:
0184         dprintk("%s could not handle NFSv4 error %d\n",
0185                 __func__, -err);
0186         break;
0187     }
0188     return -EIO;
0189 }
0190 
0191 /*
0192  * This is our standard bitmap for GETATTR requests.
0193  */
0194 const u32 nfs4_fattr_bitmap[3] = {
0195     FATTR4_WORD0_TYPE
0196     | FATTR4_WORD0_CHANGE
0197     | FATTR4_WORD0_SIZE
0198     | FATTR4_WORD0_FSID
0199     | FATTR4_WORD0_FILEID,
0200     FATTR4_WORD1_MODE
0201     | FATTR4_WORD1_NUMLINKS
0202     | FATTR4_WORD1_OWNER
0203     | FATTR4_WORD1_OWNER_GROUP
0204     | FATTR4_WORD1_RAWDEV
0205     | FATTR4_WORD1_SPACE_USED
0206     | FATTR4_WORD1_TIME_ACCESS
0207     | FATTR4_WORD1_TIME_METADATA
0208     | FATTR4_WORD1_TIME_MODIFY
0209     | FATTR4_WORD1_MOUNTED_ON_FILEID,
0210 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
0211     FATTR4_WORD2_SECURITY_LABEL
0212 #endif
0213 };
0214 
0215 static const u32 nfs4_pnfs_open_bitmap[3] = {
0216     FATTR4_WORD0_TYPE
0217     | FATTR4_WORD0_CHANGE
0218     | FATTR4_WORD0_SIZE
0219     | FATTR4_WORD0_FSID
0220     | FATTR4_WORD0_FILEID,
0221     FATTR4_WORD1_MODE
0222     | FATTR4_WORD1_NUMLINKS
0223     | FATTR4_WORD1_OWNER
0224     | FATTR4_WORD1_OWNER_GROUP
0225     | FATTR4_WORD1_RAWDEV
0226     | FATTR4_WORD1_SPACE_USED
0227     | FATTR4_WORD1_TIME_ACCESS
0228     | FATTR4_WORD1_TIME_METADATA
0229     | FATTR4_WORD1_TIME_MODIFY,
0230     FATTR4_WORD2_MDSTHRESHOLD
0231 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
0232     | FATTR4_WORD2_SECURITY_LABEL
0233 #endif
0234 };
0235 
0236 static const u32 nfs4_open_noattr_bitmap[3] = {
0237     FATTR4_WORD0_TYPE
0238     | FATTR4_WORD0_FILEID,
0239 };
0240 
0241 const u32 nfs4_statfs_bitmap[3] = {
0242     FATTR4_WORD0_FILES_AVAIL
0243     | FATTR4_WORD0_FILES_FREE
0244     | FATTR4_WORD0_FILES_TOTAL,
0245     FATTR4_WORD1_SPACE_AVAIL
0246     | FATTR4_WORD1_SPACE_FREE
0247     | FATTR4_WORD1_SPACE_TOTAL
0248 };
0249 
0250 const u32 nfs4_pathconf_bitmap[3] = {
0251     FATTR4_WORD0_MAXLINK
0252     | FATTR4_WORD0_MAXNAME,
0253     0
0254 };
0255 
0256 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
0257             | FATTR4_WORD0_MAXREAD
0258             | FATTR4_WORD0_MAXWRITE
0259             | FATTR4_WORD0_LEASE_TIME,
0260             FATTR4_WORD1_TIME_DELTA
0261             | FATTR4_WORD1_FS_LAYOUT_TYPES,
0262             FATTR4_WORD2_LAYOUT_BLKSIZE
0263             | FATTR4_WORD2_CLONE_BLKSIZE
0264             | FATTR4_WORD2_CHANGE_ATTR_TYPE
0265             | FATTR4_WORD2_XATTR_SUPPORT
0266 };
0267 
0268 const u32 nfs4_fs_locations_bitmap[3] = {
0269     FATTR4_WORD0_CHANGE
0270     | FATTR4_WORD0_SIZE
0271     | FATTR4_WORD0_FSID
0272     | FATTR4_WORD0_FILEID
0273     | FATTR4_WORD0_FS_LOCATIONS,
0274     FATTR4_WORD1_OWNER
0275     | FATTR4_WORD1_OWNER_GROUP
0276     | FATTR4_WORD1_RAWDEV
0277     | FATTR4_WORD1_SPACE_USED
0278     | FATTR4_WORD1_TIME_ACCESS
0279     | FATTR4_WORD1_TIME_METADATA
0280     | FATTR4_WORD1_TIME_MODIFY
0281     | FATTR4_WORD1_MOUNTED_ON_FILEID,
0282 };
0283 
0284 static void nfs4_bitmap_copy_adjust(__u32 *dst, const __u32 *src,
0285                     struct inode *inode, unsigned long flags)
0286 {
0287     unsigned long cache_validity;
0288 
0289     memcpy(dst, src, NFS4_BITMASK_SZ*sizeof(*dst));
0290     if (!inode || !nfs4_have_delegation(inode, FMODE_READ))
0291         return;
0292 
0293     cache_validity = READ_ONCE(NFS_I(inode)->cache_validity) | flags;
0294 
0295     /* Remove the attributes over which we have full control */
0296     dst[1] &= ~FATTR4_WORD1_RAWDEV;
0297     if (!(cache_validity & NFS_INO_INVALID_SIZE))
0298         dst[0] &= ~FATTR4_WORD0_SIZE;
0299 
0300     if (!(cache_validity & NFS_INO_INVALID_CHANGE))
0301         dst[0] &= ~FATTR4_WORD0_CHANGE;
0302 
0303     if (!(cache_validity & NFS_INO_INVALID_MODE))
0304         dst[1] &= ~FATTR4_WORD1_MODE;
0305     if (!(cache_validity & NFS_INO_INVALID_OTHER))
0306         dst[1] &= ~(FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP);
0307 }
0308 
0309 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
0310         struct nfs4_readdir_arg *readdir)
0311 {
0312     unsigned int attrs = FATTR4_WORD0_FILEID | FATTR4_WORD0_TYPE;
0313     __be32 *start, *p;
0314 
0315     if (cookie > 2) {
0316         readdir->cookie = cookie;
0317         memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
0318         return;
0319     }
0320 
0321     readdir->cookie = 0;
0322     memset(&readdir->verifier, 0, sizeof(readdir->verifier));
0323     if (cookie == 2)
0324         return;
0325     
0326     /*
0327      * NFSv4 servers do not return entries for '.' and '..'
0328      * Therefore, we fake these entries here.  We let '.'
0329      * have cookie 0 and '..' have cookie 1.  Note that
0330      * when talking to the server, we always send cookie 0
0331      * instead of 1 or 2.
0332      */
0333     start = p = kmap_atomic(*readdir->pages);
0334     
0335     if (cookie == 0) {
0336         *p++ = xdr_one;                                  /* next */
0337         *p++ = xdr_zero;                   /* cookie, first word */
0338         *p++ = xdr_one;                   /* cookie, second word */
0339         *p++ = xdr_one;                             /* entry len */
0340         memcpy(p, ".\0\0\0", 4);                        /* entry */
0341         p++;
0342         *p++ = xdr_one;                         /* bitmap length */
0343         *p++ = htonl(attrs);                           /* bitmap */
0344         *p++ = htonl(12);             /* attribute buffer length */
0345         *p++ = htonl(NF4DIR);
0346         p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry)));
0347     }
0348     
0349     *p++ = xdr_one;                                  /* next */
0350     *p++ = xdr_zero;                   /* cookie, first word */
0351     *p++ = xdr_two;                   /* cookie, second word */
0352     *p++ = xdr_two;                             /* entry len */
0353     memcpy(p, "..\0\0", 4);                         /* entry */
0354     p++;
0355     *p++ = xdr_one;                         /* bitmap length */
0356     *p++ = htonl(attrs);                           /* bitmap */
0357     *p++ = htonl(12);             /* attribute buffer length */
0358     *p++ = htonl(NF4DIR);
0359     p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry->d_parent)));
0360 
0361     readdir->pgbase = (char *)p - (char *)start;
0362     readdir->count -= readdir->pgbase;
0363     kunmap_atomic(start);
0364 }
0365 
0366 static void nfs4_fattr_set_prechange(struct nfs_fattr *fattr, u64 version)
0367 {
0368     if (!(fattr->valid & NFS_ATTR_FATTR_PRECHANGE)) {
0369         fattr->pre_change_attr = version;
0370         fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
0371     }
0372 }
0373 
0374 static void nfs4_test_and_free_stateid(struct nfs_server *server,
0375         nfs4_stateid *stateid,
0376         const struct cred *cred)
0377 {
0378     const struct nfs4_minor_version_ops *ops = server->nfs_client->cl_mvops;
0379 
0380     ops->test_and_free_expired(server, stateid, cred);
0381 }
0382 
0383 static void __nfs4_free_revoked_stateid(struct nfs_server *server,
0384         nfs4_stateid *stateid,
0385         const struct cred *cred)
0386 {
0387     stateid->type = NFS4_REVOKED_STATEID_TYPE;
0388     nfs4_test_and_free_stateid(server, stateid, cred);
0389 }
0390 
0391 static void nfs4_free_revoked_stateid(struct nfs_server *server,
0392         const nfs4_stateid *stateid,
0393         const struct cred *cred)
0394 {
0395     nfs4_stateid tmp;
0396 
0397     nfs4_stateid_copy(&tmp, stateid);
0398     __nfs4_free_revoked_stateid(server, &tmp, cred);
0399 }
0400 
0401 static long nfs4_update_delay(long *timeout)
0402 {
0403     long ret;
0404     if (!timeout)
0405         return NFS4_POLL_RETRY_MAX;
0406     if (*timeout <= 0)
0407         *timeout = NFS4_POLL_RETRY_MIN;
0408     if (*timeout > NFS4_POLL_RETRY_MAX)
0409         *timeout = NFS4_POLL_RETRY_MAX;
0410     ret = *timeout;
0411     *timeout <<= 1;
0412     return ret;
0413 }
0414 
0415 static int nfs4_delay_killable(long *timeout)
0416 {
0417     might_sleep();
0418 
0419     freezable_schedule_timeout_killable_unsafe(
0420         nfs4_update_delay(timeout));
0421     if (!__fatal_signal_pending(current))
0422         return 0;
0423     return -EINTR;
0424 }
0425 
0426 static int nfs4_delay_interruptible(long *timeout)
0427 {
0428     might_sleep();
0429 
0430     freezable_schedule_timeout_interruptible_unsafe(nfs4_update_delay(timeout));
0431     if (!signal_pending(current))
0432         return 0;
0433     return __fatal_signal_pending(current) ? -EINTR :-ERESTARTSYS;
0434 }
0435 
0436 static int nfs4_delay(long *timeout, bool interruptible)
0437 {
0438     if (interruptible)
0439         return nfs4_delay_interruptible(timeout);
0440     return nfs4_delay_killable(timeout);
0441 }
0442 
0443 static const nfs4_stateid *
0444 nfs4_recoverable_stateid(const nfs4_stateid *stateid)
0445 {
0446     if (!stateid)
0447         return NULL;
0448     switch (stateid->type) {
0449     case NFS4_OPEN_STATEID_TYPE:
0450     case NFS4_LOCK_STATEID_TYPE:
0451     case NFS4_DELEGATION_STATEID_TYPE:
0452         return stateid;
0453     default:
0454         break;
0455     }
0456     return NULL;
0457 }
0458 
0459 /* This is the error handling routine for processes that are allowed
0460  * to sleep.
0461  */
0462 static int nfs4_do_handle_exception(struct nfs_server *server,
0463         int errorcode, struct nfs4_exception *exception)
0464 {
0465     struct nfs_client *clp = server->nfs_client;
0466     struct nfs4_state *state = exception->state;
0467     const nfs4_stateid *stateid;
0468     struct inode *inode = exception->inode;
0469     int ret = errorcode;
0470 
0471     exception->delay = 0;
0472     exception->recovering = 0;
0473     exception->retry = 0;
0474 
0475     stateid = nfs4_recoverable_stateid(exception->stateid);
0476     if (stateid == NULL && state != NULL)
0477         stateid = nfs4_recoverable_stateid(&state->stateid);
0478 
0479     switch(errorcode) {
0480         case 0:
0481             return 0;
0482         case -NFS4ERR_BADHANDLE:
0483         case -ESTALE:
0484             if (inode != NULL && S_ISREG(inode->i_mode))
0485                 pnfs_destroy_layout(NFS_I(inode));
0486             break;
0487         case -NFS4ERR_DELEG_REVOKED:
0488         case -NFS4ERR_ADMIN_REVOKED:
0489         case -NFS4ERR_EXPIRED:
0490         case -NFS4ERR_BAD_STATEID:
0491         case -NFS4ERR_PARTNER_NO_AUTH:
0492             if (inode != NULL && stateid != NULL) {
0493                 nfs_inode_find_state_and_recover(inode,
0494                         stateid);
0495                 goto wait_on_recovery;
0496             }
0497             fallthrough;
0498         case -NFS4ERR_OPENMODE:
0499             if (inode) {
0500                 int err;
0501 
0502                 err = nfs_async_inode_return_delegation(inode,
0503                         stateid);
0504                 if (err == 0)
0505                     goto wait_on_recovery;
0506                 if (stateid != NULL && stateid->type == NFS4_DELEGATION_STATEID_TYPE) {
0507                     exception->retry = 1;
0508                     break;
0509                 }
0510             }
0511             if (state == NULL)
0512                 break;
0513             ret = nfs4_schedule_stateid_recovery(server, state);
0514             if (ret < 0)
0515                 break;
0516             goto wait_on_recovery;
0517         case -NFS4ERR_STALE_STATEID:
0518         case -NFS4ERR_STALE_CLIENTID:
0519             nfs4_schedule_lease_recovery(clp);
0520             goto wait_on_recovery;
0521         case -NFS4ERR_MOVED:
0522             ret = nfs4_schedule_migration_recovery(server);
0523             if (ret < 0)
0524                 break;
0525             goto wait_on_recovery;
0526         case -NFS4ERR_LEASE_MOVED:
0527             nfs4_schedule_lease_moved_recovery(clp);
0528             goto wait_on_recovery;
0529 #if defined(CONFIG_NFS_V4_1)
0530         case -NFS4ERR_BADSESSION:
0531         case -NFS4ERR_BADSLOT:
0532         case -NFS4ERR_BAD_HIGH_SLOT:
0533         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
0534         case -NFS4ERR_DEADSESSION:
0535         case -NFS4ERR_SEQ_FALSE_RETRY:
0536         case -NFS4ERR_SEQ_MISORDERED:
0537             /* Handled in nfs41_sequence_process() */
0538             goto wait_on_recovery;
0539 #endif /* defined(CONFIG_NFS_V4_1) */
0540         case -NFS4ERR_FILE_OPEN:
0541             if (exception->timeout > HZ) {
0542                 /* We have retried a decent amount, time to
0543                  * fail
0544                  */
0545                 ret = -EBUSY;
0546                 break;
0547             }
0548             fallthrough;
0549         case -NFS4ERR_DELAY:
0550             nfs_inc_server_stats(server, NFSIOS_DELAY);
0551             fallthrough;
0552         case -NFS4ERR_GRACE:
0553         case -NFS4ERR_LAYOUTTRYLATER:
0554         case -NFS4ERR_RECALLCONFLICT:
0555             exception->delay = 1;
0556             return 0;
0557 
0558         case -NFS4ERR_RETRY_UNCACHED_REP:
0559         case -NFS4ERR_OLD_STATEID:
0560             exception->retry = 1;
0561             break;
0562         case -NFS4ERR_BADOWNER:
0563             /* The following works around a Linux server bug! */
0564         case -NFS4ERR_BADNAME:
0565             if (server->caps & NFS_CAP_UIDGID_NOMAP) {
0566                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
0567                 exception->retry = 1;
0568                 printk(KERN_WARNING "NFS: v4 server %s "
0569                         "does not accept raw "
0570                         "uid/gids. "
0571                         "Reenabling the idmapper.\n",
0572                         server->nfs_client->cl_hostname);
0573             }
0574     }
0575     /* We failed to handle the error */
0576     return nfs4_map_errors(ret);
0577 wait_on_recovery:
0578     exception->recovering = 1;
0579     return 0;
0580 }
0581 
0582 /* This is the error handling routine for processes that are allowed
0583  * to sleep.
0584  */
0585 int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
0586 {
0587     struct nfs_client *clp = server->nfs_client;
0588     int ret;
0589 
0590     ret = nfs4_do_handle_exception(server, errorcode, exception);
0591     if (exception->delay) {
0592         ret = nfs4_delay(&exception->timeout,
0593                 exception->interruptible);
0594         goto out_retry;
0595     }
0596     if (exception->recovering) {
0597         if (exception->task_is_privileged)
0598             return -EDEADLOCK;
0599         ret = nfs4_wait_clnt_recover(clp);
0600         if (test_bit(NFS_MIG_FAILED, &server->mig_status))
0601             return -EIO;
0602         goto out_retry;
0603     }
0604     return ret;
0605 out_retry:
0606     if (ret == 0)
0607         exception->retry = 1;
0608     return ret;
0609 }
0610 
0611 static int
0612 nfs4_async_handle_exception(struct rpc_task *task, struct nfs_server *server,
0613         int errorcode, struct nfs4_exception *exception)
0614 {
0615     struct nfs_client *clp = server->nfs_client;
0616     int ret;
0617 
0618     ret = nfs4_do_handle_exception(server, errorcode, exception);
0619     if (exception->delay) {
0620         rpc_delay(task, nfs4_update_delay(&exception->timeout));
0621         goto out_retry;
0622     }
0623     if (exception->recovering) {
0624         if (exception->task_is_privileged)
0625             return -EDEADLOCK;
0626         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
0627         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
0628             rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
0629         goto out_retry;
0630     }
0631     if (test_bit(NFS_MIG_FAILED, &server->mig_status))
0632         ret = -EIO;
0633     return ret;
0634 out_retry:
0635     if (ret == 0) {
0636         exception->retry = 1;
0637         /*
0638          * For NFS4ERR_MOVED, the client transport will need to
0639          * be recomputed after migration recovery has completed.
0640          */
0641         if (errorcode == -NFS4ERR_MOVED)
0642             rpc_task_release_transport(task);
0643     }
0644     return ret;
0645 }
0646 
0647 int
0648 nfs4_async_handle_error(struct rpc_task *task, struct nfs_server *server,
0649             struct nfs4_state *state, long *timeout)
0650 {
0651     struct nfs4_exception exception = {
0652         .state = state,
0653     };
0654 
0655     if (task->tk_status >= 0)
0656         return 0;
0657     if (timeout)
0658         exception.timeout = *timeout;
0659     task->tk_status = nfs4_async_handle_exception(task, server,
0660             task->tk_status,
0661             &exception);
0662     if (exception.delay && timeout)
0663         *timeout = exception.timeout;
0664     if (exception.retry)
0665         return -EAGAIN;
0666     return 0;
0667 }
0668 
0669 /*
0670  * Return 'true' if 'clp' is using an rpc_client that is integrity protected
0671  * or 'false' otherwise.
0672  */
0673 static bool _nfs4_is_integrity_protected(struct nfs_client *clp)
0674 {
0675     rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor;
0676     return (flavor == RPC_AUTH_GSS_KRB5I) || (flavor == RPC_AUTH_GSS_KRB5P);
0677 }
0678 
0679 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
0680 {
0681     spin_lock(&clp->cl_lock);
0682     if (time_before(clp->cl_last_renewal,timestamp))
0683         clp->cl_last_renewal = timestamp;
0684     spin_unlock(&clp->cl_lock);
0685 }
0686 
0687 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
0688 {
0689     struct nfs_client *clp = server->nfs_client;
0690 
0691     if (!nfs4_has_session(clp))
0692         do_renew_lease(clp, timestamp);
0693 }
0694 
0695 struct nfs4_call_sync_data {
0696     const struct nfs_server *seq_server;
0697     struct nfs4_sequence_args *seq_args;
0698     struct nfs4_sequence_res *seq_res;
0699 };
0700 
0701 void nfs4_init_sequence(struct nfs4_sequence_args *args,
0702             struct nfs4_sequence_res *res, int cache_reply,
0703             int privileged)
0704 {
0705     args->sa_slot = NULL;
0706     args->sa_cache_this = cache_reply;
0707     args->sa_privileged = privileged;
0708 
0709     res->sr_slot = NULL;
0710 }
0711 
0712 static void nfs40_sequence_free_slot(struct nfs4_sequence_res *res)
0713 {
0714     struct nfs4_slot *slot = res->sr_slot;
0715     struct nfs4_slot_table *tbl;
0716 
0717     tbl = slot->table;
0718     spin_lock(&tbl->slot_tbl_lock);
0719     if (!nfs41_wake_and_assign_slot(tbl, slot))
0720         nfs4_free_slot(tbl, slot);
0721     spin_unlock(&tbl->slot_tbl_lock);
0722 
0723     res->sr_slot = NULL;
0724 }
0725 
0726 static int nfs40_sequence_done(struct rpc_task *task,
0727                    struct nfs4_sequence_res *res)
0728 {
0729     if (res->sr_slot != NULL)
0730         nfs40_sequence_free_slot(res);
0731     return 1;
0732 }
0733 
0734 #if defined(CONFIG_NFS_V4_1)
0735 
0736 static void nfs41_release_slot(struct nfs4_slot *slot)
0737 {
0738     struct nfs4_session *session;
0739     struct nfs4_slot_table *tbl;
0740     bool send_new_highest_used_slotid = false;
0741 
0742     if (!slot)
0743         return;
0744     tbl = slot->table;
0745     session = tbl->session;
0746 
0747     /* Bump the slot sequence number */
0748     if (slot->seq_done)
0749         slot->seq_nr++;
0750     slot->seq_done = 0;
0751 
0752     spin_lock(&tbl->slot_tbl_lock);
0753     /* Be nice to the server: try to ensure that the last transmitted
0754      * value for highest_user_slotid <= target_highest_slotid
0755      */
0756     if (tbl->highest_used_slotid > tbl->target_highest_slotid)
0757         send_new_highest_used_slotid = true;
0758 
0759     if (nfs41_wake_and_assign_slot(tbl, slot)) {
0760         send_new_highest_used_slotid = false;
0761         goto out_unlock;
0762     }
0763     nfs4_free_slot(tbl, slot);
0764 
0765     if (tbl->highest_used_slotid != NFS4_NO_SLOT)
0766         send_new_highest_used_slotid = false;
0767 out_unlock:
0768     spin_unlock(&tbl->slot_tbl_lock);
0769     if (send_new_highest_used_slotid)
0770         nfs41_notify_server(session->clp);
0771     if (waitqueue_active(&tbl->slot_waitq))
0772         wake_up_all(&tbl->slot_waitq);
0773 }
0774 
0775 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
0776 {
0777     nfs41_release_slot(res->sr_slot);
0778     res->sr_slot = NULL;
0779 }
0780 
0781 static void nfs4_slot_sequence_record_sent(struct nfs4_slot *slot,
0782         u32 seqnr)
0783 {
0784     if ((s32)(seqnr - slot->seq_nr_highest_sent) > 0)
0785         slot->seq_nr_highest_sent = seqnr;
0786 }
0787 static void nfs4_slot_sequence_acked(struct nfs4_slot *slot, u32 seqnr)
0788 {
0789     nfs4_slot_sequence_record_sent(slot, seqnr);
0790     slot->seq_nr_last_acked = seqnr;
0791 }
0792 
0793 static void nfs4_probe_sequence(struct nfs_client *client, const struct cred *cred,
0794                 struct nfs4_slot *slot)
0795 {
0796     struct rpc_task *task = _nfs41_proc_sequence(client, cred, slot, true);
0797     if (!IS_ERR(task))
0798         rpc_put_task_async(task);
0799 }
0800 
0801 static int nfs41_sequence_process(struct rpc_task *task,
0802         struct nfs4_sequence_res *res)
0803 {
0804     struct nfs4_session *session;
0805     struct nfs4_slot *slot = res->sr_slot;
0806     struct nfs_client *clp;
0807     int status;
0808     int ret = 1;
0809 
0810     if (slot == NULL)
0811         goto out_noaction;
0812     /* don't increment the sequence number if the task wasn't sent */
0813     if (!RPC_WAS_SENT(task) || slot->seq_done)
0814         goto out;
0815 
0816     session = slot->table->session;
0817     clp = session->clp;
0818 
0819     trace_nfs4_sequence_done(session, res);
0820 
0821     status = res->sr_status;
0822     if (task->tk_status == -NFS4ERR_DEADSESSION)
0823         status = -NFS4ERR_DEADSESSION;
0824 
0825     /* Check the SEQUENCE operation status */
0826     switch (status) {
0827     case 0:
0828         /* Mark this sequence number as having been acked */
0829         nfs4_slot_sequence_acked(slot, slot->seq_nr);
0830         /* Update the slot's sequence and clientid lease timer */
0831         slot->seq_done = 1;
0832         do_renew_lease(clp, res->sr_timestamp);
0833         /* Check sequence flags */
0834         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags,
0835                 !!slot->privileged);
0836         nfs41_update_target_slotid(slot->table, slot, res);
0837         break;
0838     case 1:
0839         /*
0840          * sr_status remains 1 if an RPC level error occurred.
0841          * The server may or may not have processed the sequence
0842          * operation..
0843          */
0844         nfs4_slot_sequence_record_sent(slot, slot->seq_nr);
0845         slot->seq_done = 1;
0846         goto out;
0847     case -NFS4ERR_DELAY:
0848         /* The server detected a resend of the RPC call and
0849          * returned NFS4ERR_DELAY as per Section 2.10.6.2
0850          * of RFC5661.
0851          */
0852         dprintk("%s: slot=%u seq=%u: Operation in progress\n",
0853             __func__,
0854             slot->slot_nr,
0855             slot->seq_nr);
0856         goto out_retry;
0857     case -NFS4ERR_RETRY_UNCACHED_REP:
0858     case -NFS4ERR_SEQ_FALSE_RETRY:
0859         /*
0860          * The server thinks we tried to replay a request.
0861          * Retry the call after bumping the sequence ID.
0862          */
0863         nfs4_slot_sequence_acked(slot, slot->seq_nr);
0864         goto retry_new_seq;
0865     case -NFS4ERR_BADSLOT:
0866         /*
0867          * The slot id we used was probably retired. Try again
0868          * using a different slot id.
0869          */
0870         if (slot->slot_nr < slot->table->target_highest_slotid)
0871             goto session_recover;
0872         goto retry_nowait;
0873     case -NFS4ERR_SEQ_MISORDERED:
0874         nfs4_slot_sequence_record_sent(slot, slot->seq_nr);
0875         /*
0876          * Were one or more calls using this slot interrupted?
0877          * If the server never received the request, then our
0878          * transmitted slot sequence number may be too high. However,
0879          * if the server did receive the request then it might
0880          * accidentally give us a reply with a mismatched operation.
0881          * We can sort this out by sending a lone sequence operation
0882          * to the server on the same slot.
0883          */
0884         if ((s32)(slot->seq_nr - slot->seq_nr_last_acked) > 1) {
0885             slot->seq_nr--;
0886             if (task->tk_msg.rpc_proc != &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE]) {
0887                 nfs4_probe_sequence(clp, task->tk_msg.rpc_cred, slot);
0888                 res->sr_slot = NULL;
0889             }
0890             goto retry_nowait;
0891         }
0892         /*
0893          * RFC5661:
0894          * A retry might be sent while the original request is
0895          * still in progress on the replier. The replier SHOULD
0896          * deal with the issue by returning NFS4ERR_DELAY as the
0897          * reply to SEQUENCE or CB_SEQUENCE operation, but
0898          * implementations MAY return NFS4ERR_SEQ_MISORDERED.
0899          *
0900          * Restart the search after a delay.
0901          */
0902         slot->seq_nr = slot->seq_nr_highest_sent;
0903         goto out_retry;
0904     case -NFS4ERR_BADSESSION:
0905     case -NFS4ERR_DEADSESSION:
0906     case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
0907         goto session_recover;
0908     default:
0909         /* Just update the slot sequence no. */
0910         slot->seq_done = 1;
0911     }
0912 out:
0913     /* The session may be reset by one of the error handlers. */
0914     dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
0915 out_noaction:
0916     return ret;
0917 session_recover:
0918     nfs4_schedule_session_recovery(session, status);
0919     dprintk("%s ERROR: %d Reset session\n", __func__, status);
0920     nfs41_sequence_free_slot(res);
0921     goto out;
0922 retry_new_seq:
0923     ++slot->seq_nr;
0924 retry_nowait:
0925     if (rpc_restart_call_prepare(task)) {
0926         nfs41_sequence_free_slot(res);
0927         task->tk_status = 0;
0928         ret = 0;
0929     }
0930     goto out;
0931 out_retry:
0932     if (!rpc_restart_call(task))
0933         goto out;
0934     rpc_delay(task, NFS4_POLL_RETRY_MAX);
0935     return 0;
0936 }
0937 
0938 int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
0939 {
0940     if (!nfs41_sequence_process(task, res))
0941         return 0;
0942     if (res->sr_slot != NULL)
0943         nfs41_sequence_free_slot(res);
0944     return 1;
0945 
0946 }
0947 EXPORT_SYMBOL_GPL(nfs41_sequence_done);
0948 
0949 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res)
0950 {
0951     if (res->sr_slot == NULL)
0952         return 1;
0953     if (res->sr_slot->table->session != NULL)
0954         return nfs41_sequence_process(task, res);
0955     return nfs40_sequence_done(task, res);
0956 }
0957 
0958 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res)
0959 {
0960     if (res->sr_slot != NULL) {
0961         if (res->sr_slot->table->session != NULL)
0962             nfs41_sequence_free_slot(res);
0963         else
0964             nfs40_sequence_free_slot(res);
0965     }
0966 }
0967 
0968 int nfs4_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
0969 {
0970     if (res->sr_slot == NULL)
0971         return 1;
0972     if (!res->sr_slot->table->session)
0973         return nfs40_sequence_done(task, res);
0974     return nfs41_sequence_done(task, res);
0975 }
0976 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
0977 
0978 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
0979 {
0980     struct nfs4_call_sync_data *data = calldata;
0981 
0982     dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
0983 
0984     nfs4_setup_sequence(data->seq_server->nfs_client,
0985                 data->seq_args, data->seq_res, task);
0986 }
0987 
0988 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
0989 {
0990     struct nfs4_call_sync_data *data = calldata;
0991 
0992     nfs41_sequence_done(task, data->seq_res);
0993 }
0994 
0995 static const struct rpc_call_ops nfs41_call_sync_ops = {
0996     .rpc_call_prepare = nfs41_call_sync_prepare,
0997     .rpc_call_done = nfs41_call_sync_done,
0998 };
0999 
1000 #else   /* !CONFIG_NFS_V4_1 */
1001 
1002 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res)
1003 {
1004     return nfs40_sequence_done(task, res);
1005 }
1006 
1007 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res)
1008 {
1009     if (res->sr_slot != NULL)
1010         nfs40_sequence_free_slot(res);
1011 }
1012 
1013 int nfs4_sequence_done(struct rpc_task *task,
1014                struct nfs4_sequence_res *res)
1015 {
1016     return nfs40_sequence_done(task, res);
1017 }
1018 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
1019 
1020 #endif  /* !CONFIG_NFS_V4_1 */
1021 
1022 static void nfs41_sequence_res_init(struct nfs4_sequence_res *res)
1023 {
1024     res->sr_timestamp = jiffies;
1025     res->sr_status_flags = 0;
1026     res->sr_status = 1;
1027 }
1028 
1029 static
1030 void nfs4_sequence_attach_slot(struct nfs4_sequence_args *args,
1031         struct nfs4_sequence_res *res,
1032         struct nfs4_slot *slot)
1033 {
1034     if (!slot)
1035         return;
1036     slot->privileged = args->sa_privileged ? 1 : 0;
1037     args->sa_slot = slot;
1038 
1039     res->sr_slot = slot;
1040 }
1041 
1042 int nfs4_setup_sequence(struct nfs_client *client,
1043             struct nfs4_sequence_args *args,
1044             struct nfs4_sequence_res *res,
1045             struct rpc_task *task)
1046 {
1047     struct nfs4_session *session = nfs4_get_session(client);
1048     struct nfs4_slot_table *tbl  = client->cl_slot_tbl;
1049     struct nfs4_slot *slot;
1050 
1051     /* slot already allocated? */
1052     if (res->sr_slot != NULL)
1053         goto out_start;
1054 
1055     if (session)
1056         tbl = &session->fc_slot_table;
1057 
1058     spin_lock(&tbl->slot_tbl_lock);
1059     /* The state manager will wait until the slot table is empty */
1060     if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged)
1061         goto out_sleep;
1062 
1063     slot = nfs4_alloc_slot(tbl);
1064     if (IS_ERR(slot)) {
1065         if (slot == ERR_PTR(-ENOMEM))
1066             goto out_sleep_timeout;
1067         goto out_sleep;
1068     }
1069     spin_unlock(&tbl->slot_tbl_lock);
1070 
1071     nfs4_sequence_attach_slot(args, res, slot);
1072 
1073     trace_nfs4_setup_sequence(session, args);
1074 out_start:
1075     nfs41_sequence_res_init(res);
1076     rpc_call_start(task);
1077     return 0;
1078 out_sleep_timeout:
1079     /* Try again in 1/4 second */
1080     if (args->sa_privileged)
1081         rpc_sleep_on_priority_timeout(&tbl->slot_tbl_waitq, task,
1082                 jiffies + (HZ >> 2), RPC_PRIORITY_PRIVILEGED);
1083     else
1084         rpc_sleep_on_timeout(&tbl->slot_tbl_waitq, task,
1085                 NULL, jiffies + (HZ >> 2));
1086     spin_unlock(&tbl->slot_tbl_lock);
1087     return -EAGAIN;
1088 out_sleep:
1089     if (args->sa_privileged)
1090         rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
1091                 RPC_PRIORITY_PRIVILEGED);
1092     else
1093         rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
1094     spin_unlock(&tbl->slot_tbl_lock);
1095     return -EAGAIN;
1096 }
1097 EXPORT_SYMBOL_GPL(nfs4_setup_sequence);
1098 
1099 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata)
1100 {
1101     struct nfs4_call_sync_data *data = calldata;
1102     nfs4_setup_sequence(data->seq_server->nfs_client,
1103                 data->seq_args, data->seq_res, task);
1104 }
1105 
1106 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata)
1107 {
1108     struct nfs4_call_sync_data *data = calldata;
1109     nfs4_sequence_done(task, data->seq_res);
1110 }
1111 
1112 static const struct rpc_call_ops nfs40_call_sync_ops = {
1113     .rpc_call_prepare = nfs40_call_sync_prepare,
1114     .rpc_call_done = nfs40_call_sync_done,
1115 };
1116 
1117 static int nfs4_call_sync_custom(struct rpc_task_setup *task_setup)
1118 {
1119     int ret;
1120     struct rpc_task *task;
1121 
1122     task = rpc_run_task(task_setup);
1123     if (IS_ERR(task))
1124         return PTR_ERR(task);
1125 
1126     ret = task->tk_status;
1127     rpc_put_task(task);
1128     return ret;
1129 }
1130 
1131 static int nfs4_do_call_sync(struct rpc_clnt *clnt,
1132                  struct nfs_server *server,
1133                  struct rpc_message *msg,
1134                  struct nfs4_sequence_args *args,
1135                  struct nfs4_sequence_res *res,
1136                  unsigned short task_flags)
1137 {
1138     struct nfs_client *clp = server->nfs_client;
1139     struct nfs4_call_sync_data data = {
1140         .seq_server = server,
1141         .seq_args = args,
1142         .seq_res = res,
1143     };
1144     struct rpc_task_setup task_setup = {
1145         .rpc_client = clnt,
1146         .rpc_message = msg,
1147         .callback_ops = clp->cl_mvops->call_sync_ops,
1148         .callback_data = &data,
1149         .flags = task_flags,
1150     };
1151 
1152     return nfs4_call_sync_custom(&task_setup);
1153 }
1154 
1155 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
1156                    struct nfs_server *server,
1157                    struct rpc_message *msg,
1158                    struct nfs4_sequence_args *args,
1159                    struct nfs4_sequence_res *res)
1160 {
1161     unsigned short task_flags = 0;
1162 
1163     if (server->caps & NFS_CAP_MOVEABLE)
1164         task_flags = RPC_TASK_MOVEABLE;
1165     return nfs4_do_call_sync(clnt, server, msg, args, res, task_flags);
1166 }
1167 
1168 
1169 int nfs4_call_sync(struct rpc_clnt *clnt,
1170            struct nfs_server *server,
1171            struct rpc_message *msg,
1172            struct nfs4_sequence_args *args,
1173            struct nfs4_sequence_res *res,
1174            int cache_reply)
1175 {
1176     nfs4_init_sequence(args, res, cache_reply, 0);
1177     return nfs4_call_sync_sequence(clnt, server, msg, args, res);
1178 }
1179 
1180 static void
1181 nfs4_inc_nlink_locked(struct inode *inode)
1182 {
1183     nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE |
1184                          NFS_INO_INVALID_CTIME |
1185                          NFS_INO_INVALID_NLINK);
1186     inc_nlink(inode);
1187 }
1188 
1189 static void
1190 nfs4_inc_nlink(struct inode *inode)
1191 {
1192     spin_lock(&inode->i_lock);
1193     nfs4_inc_nlink_locked(inode);
1194     spin_unlock(&inode->i_lock);
1195 }
1196 
1197 static void
1198 nfs4_dec_nlink_locked(struct inode *inode)
1199 {
1200     nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE |
1201                          NFS_INO_INVALID_CTIME |
1202                          NFS_INO_INVALID_NLINK);
1203     drop_nlink(inode);
1204 }
1205 
1206 static void
1207 nfs4_update_changeattr_locked(struct inode *inode,
1208         struct nfs4_change_info *cinfo,
1209         unsigned long timestamp, unsigned long cache_validity)
1210 {
1211     struct nfs_inode *nfsi = NFS_I(inode);
1212     u64 change_attr = inode_peek_iversion_raw(inode);
1213 
1214     cache_validity |= NFS_INO_INVALID_CTIME | NFS_INO_INVALID_MTIME;
1215     if (S_ISDIR(inode->i_mode))
1216         cache_validity |= NFS_INO_INVALID_DATA;
1217 
1218     switch (NFS_SERVER(inode)->change_attr_type) {
1219     case NFS4_CHANGE_TYPE_IS_UNDEFINED:
1220         if (cinfo->after == change_attr)
1221             goto out;
1222         break;
1223     default:
1224         if ((s64)(change_attr - cinfo->after) >= 0)
1225             goto out;
1226     }
1227 
1228     inode_set_iversion_raw(inode, cinfo->after);
1229     if (!cinfo->atomic || cinfo->before != change_attr) {
1230         if (S_ISDIR(inode->i_mode))
1231             nfs_force_lookup_revalidate(inode);
1232 
1233         if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
1234             cache_validity |=
1235                 NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL |
1236                 NFS_INO_INVALID_SIZE | NFS_INO_INVALID_OTHER |
1237                 NFS_INO_INVALID_BLOCKS | NFS_INO_INVALID_NLINK |
1238                 NFS_INO_INVALID_MODE | NFS_INO_INVALID_XATTR;
1239         nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
1240     }
1241     nfsi->attrtimeo_timestamp = jiffies;
1242     nfsi->read_cache_jiffies = timestamp;
1243     nfsi->attr_gencount = nfs_inc_attr_generation_counter();
1244     nfsi->cache_validity &= ~NFS_INO_INVALID_CHANGE;
1245 out:
1246     nfs_set_cache_invalid(inode, cache_validity);
1247 }
1248 
1249 void
1250 nfs4_update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo,
1251         unsigned long timestamp, unsigned long cache_validity)
1252 {
1253     spin_lock(&dir->i_lock);
1254     nfs4_update_changeattr_locked(dir, cinfo, timestamp, cache_validity);
1255     spin_unlock(&dir->i_lock);
1256 }
1257 
1258 struct nfs4_open_createattrs {
1259     struct nfs4_label *label;
1260     struct iattr *sattr;
1261     const __u32 verf[2];
1262 };
1263 
1264 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
1265         int err, struct nfs4_exception *exception)
1266 {
1267     if (err != -EINVAL)
1268         return false;
1269     if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
1270         return false;
1271     server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
1272     exception->retry = 1;
1273     return true;
1274 }
1275 
1276 static fmode_t _nfs4_ctx_to_accessmode(const struct nfs_open_context *ctx)
1277 {
1278      return ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
1279 }
1280 
1281 static fmode_t _nfs4_ctx_to_openmode(const struct nfs_open_context *ctx)
1282 {
1283     fmode_t ret = ctx->mode & (FMODE_READ|FMODE_WRITE);
1284 
1285     return (ctx->mode & FMODE_EXEC) ? FMODE_READ | ret : ret;
1286 }
1287 
1288 static u32
1289 nfs4_map_atomic_open_share(struct nfs_server *server,
1290         fmode_t fmode, int openflags)
1291 {
1292     u32 res = 0;
1293 
1294     switch (fmode & (FMODE_READ | FMODE_WRITE)) {
1295     case FMODE_READ:
1296         res = NFS4_SHARE_ACCESS_READ;
1297         break;
1298     case FMODE_WRITE:
1299         res = NFS4_SHARE_ACCESS_WRITE;
1300         break;
1301     case FMODE_READ|FMODE_WRITE:
1302         res = NFS4_SHARE_ACCESS_BOTH;
1303     }
1304     if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
1305         goto out;
1306     /* Want no delegation if we're using O_DIRECT */
1307     if (openflags & O_DIRECT)
1308         res |= NFS4_SHARE_WANT_NO_DELEG;
1309 out:
1310     return res;
1311 }
1312 
1313 static enum open_claim_type4
1314 nfs4_map_atomic_open_claim(struct nfs_server *server,
1315         enum open_claim_type4 claim)
1316 {
1317     if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
1318         return claim;
1319     switch (claim) {
1320     default:
1321         return claim;
1322     case NFS4_OPEN_CLAIM_FH:
1323         return NFS4_OPEN_CLAIM_NULL;
1324     case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1325         return NFS4_OPEN_CLAIM_DELEGATE_CUR;
1326     case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1327         return NFS4_OPEN_CLAIM_DELEGATE_PREV;
1328     }
1329 }
1330 
1331 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
1332 {
1333     p->o_res.f_attr = &p->f_attr;
1334     p->o_res.seqid = p->o_arg.seqid;
1335     p->c_res.seqid = p->c_arg.seqid;
1336     p->o_res.server = p->o_arg.server;
1337     p->o_res.access_request = p->o_arg.access;
1338     nfs_fattr_init(&p->f_attr);
1339     nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
1340 }
1341 
1342 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
1343         struct nfs4_state_owner *sp, fmode_t fmode, int flags,
1344         const struct nfs4_open_createattrs *c,
1345         enum open_claim_type4 claim,
1346         gfp_t gfp_mask)
1347 {
1348     struct dentry *parent = dget_parent(dentry);
1349     struct inode *dir = d_inode(parent);
1350     struct nfs_server *server = NFS_SERVER(dir);
1351     struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
1352     struct nfs4_label *label = (c != NULL) ? c->label : NULL;
1353     struct nfs4_opendata *p;
1354 
1355     p = kzalloc(sizeof(*p), gfp_mask);
1356     if (p == NULL)
1357         goto err;
1358 
1359     p->f_attr.label = nfs4_label_alloc(server, gfp_mask);
1360     if (IS_ERR(p->f_attr.label))
1361         goto err_free_p;
1362 
1363     p->a_label = nfs4_label_alloc(server, gfp_mask);
1364     if (IS_ERR(p->a_label))
1365         goto err_free_f;
1366 
1367     alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
1368     p->o_arg.seqid = alloc_seqid(&sp->so_seqid, gfp_mask);
1369     if (IS_ERR(p->o_arg.seqid))
1370         goto err_free_label;
1371     nfs_sb_active(dentry->d_sb);
1372     p->dentry = dget(dentry);
1373     p->dir = parent;
1374     p->owner = sp;
1375     atomic_inc(&sp->so_count);
1376     p->o_arg.open_flags = flags;
1377     p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
1378     p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
1379     p->o_arg.share_access = nfs4_map_atomic_open_share(server,
1380             fmode, flags);
1381     if (flags & O_CREAT) {
1382         p->o_arg.umask = current_umask();
1383         p->o_arg.label = nfs4_label_copy(p->a_label, label);
1384         if (c->sattr != NULL && c->sattr->ia_valid != 0) {
1385             p->o_arg.u.attrs = &p->attrs;
1386             memcpy(&p->attrs, c->sattr, sizeof(p->attrs));
1387 
1388             memcpy(p->o_arg.u.verifier.data, c->verf,
1389                     sizeof(p->o_arg.u.verifier.data));
1390         }
1391     }
1392     /* ask server to check for all possible rights as results
1393      * are cached */
1394     switch (p->o_arg.claim) {
1395     default:
1396         break;
1397     case NFS4_OPEN_CLAIM_NULL:
1398     case NFS4_OPEN_CLAIM_FH:
1399         p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
1400                   NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE |
1401                   NFS4_ACCESS_EXECUTE |
1402                   nfs_access_xattr_mask(server);
1403     }
1404     p->o_arg.clientid = server->nfs_client->cl_clientid;
1405     p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
1406     p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
1407     p->o_arg.name = &dentry->d_name;
1408     p->o_arg.server = server;
1409     p->o_arg.bitmask = nfs4_bitmask(server, label);
1410     p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
1411     switch (p->o_arg.claim) {
1412     case NFS4_OPEN_CLAIM_NULL:
1413     case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1414     case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1415         p->o_arg.fh = NFS_FH(dir);
1416         break;
1417     case NFS4_OPEN_CLAIM_PREVIOUS:
1418     case NFS4_OPEN_CLAIM_FH:
1419     case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1420     case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1421         p->o_arg.fh = NFS_FH(d_inode(dentry));
1422     }
1423     p->c_arg.fh = &p->o_res.fh;
1424     p->c_arg.stateid = &p->o_res.stateid;
1425     p->c_arg.seqid = p->o_arg.seqid;
1426     nfs4_init_opendata_res(p);
1427     kref_init(&p->kref);
1428     return p;
1429 
1430 err_free_label:
1431     nfs4_label_free(p->a_label);
1432 err_free_f:
1433     nfs4_label_free(p->f_attr.label);
1434 err_free_p:
1435     kfree(p);
1436 err:
1437     dput(parent);
1438     return NULL;
1439 }
1440 
1441 static void nfs4_opendata_free(struct kref *kref)
1442 {
1443     struct nfs4_opendata *p = container_of(kref,
1444             struct nfs4_opendata, kref);
1445     struct super_block *sb = p->dentry->d_sb;
1446 
1447     nfs4_lgopen_release(p->lgp);
1448     nfs_free_seqid(p->o_arg.seqid);
1449     nfs4_sequence_free_slot(&p->o_res.seq_res);
1450     if (p->state != NULL)
1451         nfs4_put_open_state(p->state);
1452     nfs4_put_state_owner(p->owner);
1453 
1454     nfs4_label_free(p->a_label);
1455     nfs4_label_free(p->f_attr.label);
1456 
1457     dput(p->dir);
1458     dput(p->dentry);
1459     nfs_sb_deactive(sb);
1460     nfs_fattr_free_names(&p->f_attr);
1461     kfree(p->f_attr.mdsthreshold);
1462     kfree(p);
1463 }
1464 
1465 static void nfs4_opendata_put(struct nfs4_opendata *p)
1466 {
1467     if (p != NULL)
1468         kref_put(&p->kref, nfs4_opendata_free);
1469 }
1470 
1471 static bool nfs4_mode_match_open_stateid(struct nfs4_state *state,
1472         fmode_t fmode)
1473 {
1474     switch(fmode & (FMODE_READ|FMODE_WRITE)) {
1475     case FMODE_READ|FMODE_WRITE:
1476         return state->n_rdwr != 0;
1477     case FMODE_WRITE:
1478         return state->n_wronly != 0;
1479     case FMODE_READ:
1480         return state->n_rdonly != 0;
1481     }
1482     WARN_ON_ONCE(1);
1483     return false;
1484 }
1485 
1486 static int can_open_cached(struct nfs4_state *state, fmode_t mode,
1487         int open_mode, enum open_claim_type4 claim)
1488 {
1489     int ret = 0;
1490 
1491     if (open_mode & (O_EXCL|O_TRUNC))
1492         goto out;
1493     switch (claim) {
1494     case NFS4_OPEN_CLAIM_NULL:
1495     case NFS4_OPEN_CLAIM_FH:
1496         goto out;
1497     default:
1498         break;
1499     }
1500     switch (mode & (FMODE_READ|FMODE_WRITE)) {
1501         case FMODE_READ:
1502             ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1503                 && state->n_rdonly != 0;
1504             break;
1505         case FMODE_WRITE:
1506             ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1507                 && state->n_wronly != 0;
1508             break;
1509         case FMODE_READ|FMODE_WRITE:
1510             ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1511                 && state->n_rdwr != 0;
1512     }
1513 out:
1514     return ret;
1515 }
1516 
1517 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode,
1518         enum open_claim_type4 claim)
1519 {
1520     if (delegation == NULL)
1521         return 0;
1522     if ((delegation->type & fmode) != fmode)
1523         return 0;
1524     switch (claim) {
1525     case NFS4_OPEN_CLAIM_NULL:
1526     case NFS4_OPEN_CLAIM_FH:
1527         break;
1528     case NFS4_OPEN_CLAIM_PREVIOUS:
1529         if (!test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
1530             break;
1531         fallthrough;
1532     default:
1533         return 0;
1534     }
1535     nfs_mark_delegation_referenced(delegation);
1536     return 1;
1537 }
1538 
1539 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
1540 {
1541     switch (fmode) {
1542         case FMODE_WRITE:
1543             state->n_wronly++;
1544             break;
1545         case FMODE_READ:
1546             state->n_rdonly++;
1547             break;
1548         case FMODE_READ|FMODE_WRITE:
1549             state->n_rdwr++;
1550     }
1551     nfs4_state_set_mode_locked(state, state->state | fmode);
1552 }
1553 
1554 #ifdef CONFIG_NFS_V4_1
1555 static bool nfs_open_stateid_recover_openmode(struct nfs4_state *state)
1556 {
1557     if (state->n_rdonly && !test_bit(NFS_O_RDONLY_STATE, &state->flags))
1558         return true;
1559     if (state->n_wronly && !test_bit(NFS_O_WRONLY_STATE, &state->flags))
1560         return true;
1561     if (state->n_rdwr && !test_bit(NFS_O_RDWR_STATE, &state->flags))
1562         return true;
1563     return false;
1564 }
1565 #endif /* CONFIG_NFS_V4_1 */
1566 
1567 static void nfs_state_log_update_open_stateid(struct nfs4_state *state)
1568 {
1569     if (test_and_clear_bit(NFS_STATE_CHANGE_WAIT, &state->flags))
1570         wake_up_all(&state->waitq);
1571 }
1572 
1573 static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state)
1574 {
1575     struct nfs_client *clp = state->owner->so_server->nfs_client;
1576     bool need_recover = false;
1577 
1578     if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly)
1579         need_recover = true;
1580     if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly)
1581         need_recover = true;
1582     if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr)
1583         need_recover = true;
1584     if (need_recover)
1585         nfs4_state_mark_reclaim_nograce(clp, state);
1586 }
1587 
1588 /*
1589  * Check for whether or not the caller may update the open stateid
1590  * to the value passed in by stateid.
1591  *
1592  * Note: This function relies heavily on the server implementing
1593  * RFC7530 Section 9.1.4.2, and RFC5661 Section 8.2.2
1594  * correctly.
1595  * i.e. The stateid seqids have to be initialised to 1, and
1596  * are then incremented on every state transition.
1597  */
1598 static bool nfs_stateid_is_sequential(struct nfs4_state *state,
1599         const nfs4_stateid *stateid)
1600 {
1601     if (test_bit(NFS_OPEN_STATE, &state->flags)) {
1602         /* The common case - we're updating to a new sequence number */
1603         if (nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1604             if (nfs4_stateid_is_next(&state->open_stateid, stateid))
1605                 return true;
1606             return false;
1607         }
1608         /* The server returned a new stateid */
1609     }
1610     /* This is the first OPEN in this generation */
1611     if (stateid->seqid == cpu_to_be32(1))
1612         return true;
1613     return false;
1614 }
1615 
1616 static void nfs_resync_open_stateid_locked(struct nfs4_state *state)
1617 {
1618     if (!(state->n_wronly || state->n_rdonly || state->n_rdwr))
1619         return;
1620     if (state->n_wronly)
1621         set_bit(NFS_O_WRONLY_STATE, &state->flags);
1622     if (state->n_rdonly)
1623         set_bit(NFS_O_RDONLY_STATE, &state->flags);
1624     if (state->n_rdwr)
1625         set_bit(NFS_O_RDWR_STATE, &state->flags);
1626     set_bit(NFS_OPEN_STATE, &state->flags);
1627 }
1628 
1629 static void nfs_clear_open_stateid_locked(struct nfs4_state *state,
1630         nfs4_stateid *stateid, fmode_t fmode)
1631 {
1632     clear_bit(NFS_O_RDWR_STATE, &state->flags);
1633     switch (fmode & (FMODE_READ|FMODE_WRITE)) {
1634     case FMODE_WRITE:
1635         clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1636         break;
1637     case FMODE_READ:
1638         clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1639         break;
1640     case 0:
1641         clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1642         clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1643         clear_bit(NFS_OPEN_STATE, &state->flags);
1644     }
1645     if (stateid == NULL)
1646         return;
1647     /* Handle OPEN+OPEN_DOWNGRADE races */
1648     if (nfs4_stateid_match_other(stateid, &state->open_stateid) &&
1649         !nfs4_stateid_is_newer(stateid, &state->open_stateid)) {
1650         nfs_resync_open_stateid_locked(state);
1651         goto out;
1652     }
1653     if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1654         nfs4_stateid_copy(&state->stateid, stateid);
1655     nfs4_stateid_copy(&state->open_stateid, stateid);
1656     trace_nfs4_open_stateid_update(state->inode, stateid, 0);
1657 out:
1658     nfs_state_log_update_open_stateid(state);
1659 }
1660 
1661 static void nfs_clear_open_stateid(struct nfs4_state *state,
1662     nfs4_stateid *arg_stateid,
1663     nfs4_stateid *stateid, fmode_t fmode)
1664 {
1665     write_seqlock(&state->seqlock);
1666     /* Ignore, if the CLOSE argment doesn't match the current stateid */
1667     if (nfs4_state_match_open_stateid_other(state, arg_stateid))
1668         nfs_clear_open_stateid_locked(state, stateid, fmode);
1669     write_sequnlock(&state->seqlock);
1670     if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1671         nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1672 }
1673 
1674 static void nfs_set_open_stateid_locked(struct nfs4_state *state,
1675         const nfs4_stateid *stateid, nfs4_stateid *freeme)
1676     __must_hold(&state->owner->so_lock)
1677     __must_hold(&state->seqlock)
1678     __must_hold(RCU)
1679 
1680 {
1681     DEFINE_WAIT(wait);
1682     int status = 0;
1683     for (;;) {
1684 
1685         if (nfs_stateid_is_sequential(state, stateid))
1686             break;
1687 
1688         if (status)
1689             break;
1690         /* Rely on seqids for serialisation with NFSv4.0 */
1691         if (!nfs4_has_session(NFS_SERVER(state->inode)->nfs_client))
1692             break;
1693 
1694         set_bit(NFS_STATE_CHANGE_WAIT, &state->flags);
1695         prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE);
1696         /*
1697          * Ensure we process the state changes in the same order
1698          * in which the server processed them by delaying the
1699          * update of the stateid until we are in sequence.
1700          */
1701         write_sequnlock(&state->seqlock);
1702         spin_unlock(&state->owner->so_lock);
1703         rcu_read_unlock();
1704         trace_nfs4_open_stateid_update_wait(state->inode, stateid, 0);
1705 
1706         if (!fatal_signal_pending(current)) {
1707             if (schedule_timeout(5*HZ) == 0)
1708                 status = -EAGAIN;
1709             else
1710                 status = 0;
1711         } else
1712             status = -EINTR;
1713         finish_wait(&state->waitq, &wait);
1714         rcu_read_lock();
1715         spin_lock(&state->owner->so_lock);
1716         write_seqlock(&state->seqlock);
1717     }
1718 
1719     if (test_bit(NFS_OPEN_STATE, &state->flags) &&
1720         !nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1721         nfs4_stateid_copy(freeme, &state->open_stateid);
1722         nfs_test_and_clear_all_open_stateid(state);
1723     }
1724 
1725     if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1726         nfs4_stateid_copy(&state->stateid, stateid);
1727     nfs4_stateid_copy(&state->open_stateid, stateid);
1728     trace_nfs4_open_stateid_update(state->inode, stateid, status);
1729     nfs_state_log_update_open_stateid(state);
1730 }
1731 
1732 static void nfs_state_set_open_stateid(struct nfs4_state *state,
1733         const nfs4_stateid *open_stateid,
1734         fmode_t fmode,
1735         nfs4_stateid *freeme)
1736 {
1737     /*
1738      * Protect the call to nfs4_state_set_mode_locked and
1739      * serialise the stateid update
1740      */
1741     write_seqlock(&state->seqlock);
1742     nfs_set_open_stateid_locked(state, open_stateid, freeme);
1743     switch (fmode) {
1744     case FMODE_READ:
1745         set_bit(NFS_O_RDONLY_STATE, &state->flags);
1746         break;
1747     case FMODE_WRITE:
1748         set_bit(NFS_O_WRONLY_STATE, &state->flags);
1749         break;
1750     case FMODE_READ|FMODE_WRITE:
1751         set_bit(NFS_O_RDWR_STATE, &state->flags);
1752     }
1753     set_bit(NFS_OPEN_STATE, &state->flags);
1754     write_sequnlock(&state->seqlock);
1755 }
1756 
1757 static void nfs_state_clear_open_state_flags(struct nfs4_state *state)
1758 {
1759     clear_bit(NFS_O_RDWR_STATE, &state->flags);
1760     clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1761     clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1762     clear_bit(NFS_OPEN_STATE, &state->flags);
1763 }
1764 
1765 static void nfs_state_set_delegation(struct nfs4_state *state,
1766         const nfs4_stateid *deleg_stateid,
1767         fmode_t fmode)
1768 {
1769     /*
1770      * Protect the call to nfs4_state_set_mode_locked and
1771      * serialise the stateid update
1772      */
1773     write_seqlock(&state->seqlock);
1774     nfs4_stateid_copy(&state->stateid, deleg_stateid);
1775     set_bit(NFS_DELEGATED_STATE, &state->flags);
1776     write_sequnlock(&state->seqlock);
1777 }
1778 
1779 static void nfs_state_clear_delegation(struct nfs4_state *state)
1780 {
1781     write_seqlock(&state->seqlock);
1782     nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1783     clear_bit(NFS_DELEGATED_STATE, &state->flags);
1784     write_sequnlock(&state->seqlock);
1785 }
1786 
1787 int update_open_stateid(struct nfs4_state *state,
1788         const nfs4_stateid *open_stateid,
1789         const nfs4_stateid *delegation,
1790         fmode_t fmode)
1791 {
1792     struct nfs_server *server = NFS_SERVER(state->inode);
1793     struct nfs_client *clp = server->nfs_client;
1794     struct nfs_inode *nfsi = NFS_I(state->inode);
1795     struct nfs_delegation *deleg_cur;
1796     nfs4_stateid freeme = { };
1797     int ret = 0;
1798 
1799     fmode &= (FMODE_READ|FMODE_WRITE);
1800 
1801     rcu_read_lock();
1802     spin_lock(&state->owner->so_lock);
1803     if (open_stateid != NULL) {
1804         nfs_state_set_open_stateid(state, open_stateid, fmode, &freeme);
1805         ret = 1;
1806     }
1807 
1808     deleg_cur = nfs4_get_valid_delegation(state->inode);
1809     if (deleg_cur == NULL)
1810         goto no_delegation;
1811 
1812     spin_lock(&deleg_cur->lock);
1813     if (rcu_dereference(nfsi->delegation) != deleg_cur ||
1814        test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1815         (deleg_cur->type & fmode) != fmode)
1816         goto no_delegation_unlock;
1817 
1818     if (delegation == NULL)
1819         delegation = &deleg_cur->stateid;
1820     else if (!nfs4_stateid_match_other(&deleg_cur->stateid, delegation))
1821         goto no_delegation_unlock;
1822 
1823     nfs_mark_delegation_referenced(deleg_cur);
1824     nfs_state_set_delegation(state, &deleg_cur->stateid, fmode);
1825     ret = 1;
1826 no_delegation_unlock:
1827     spin_unlock(&deleg_cur->lock);
1828 no_delegation:
1829     if (ret)
1830         update_open_stateflags(state, fmode);
1831     spin_unlock(&state->owner->so_lock);
1832     rcu_read_unlock();
1833 
1834     if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1835         nfs4_schedule_state_manager(clp);
1836     if (freeme.type != 0)
1837         nfs4_test_and_free_stateid(server, &freeme,
1838                 state->owner->so_cred);
1839 
1840     return ret;
1841 }
1842 
1843 static bool nfs4_update_lock_stateid(struct nfs4_lock_state *lsp,
1844         const nfs4_stateid *stateid)
1845 {
1846     struct nfs4_state *state = lsp->ls_state;
1847     bool ret = false;
1848 
1849     spin_lock(&state->state_lock);
1850     if (!nfs4_stateid_match_other(stateid, &lsp->ls_stateid))
1851         goto out_noupdate;
1852     if (!nfs4_stateid_is_newer(stateid, &lsp->ls_stateid))
1853         goto out_noupdate;
1854     nfs4_stateid_copy(&lsp->ls_stateid, stateid);
1855     ret = true;
1856 out_noupdate:
1857     spin_unlock(&state->state_lock);
1858     return ret;
1859 }
1860 
1861 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1862 {
1863     struct nfs_delegation *delegation;
1864 
1865     fmode &= FMODE_READ|FMODE_WRITE;
1866     rcu_read_lock();
1867     delegation = nfs4_get_valid_delegation(inode);
1868     if (delegation == NULL || (delegation->type & fmode) == fmode) {
1869         rcu_read_unlock();
1870         return;
1871     }
1872     rcu_read_unlock();
1873     nfs4_inode_return_delegation(inode);
1874 }
1875 
1876 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1877 {
1878     struct nfs4_state *state = opendata->state;
1879     struct nfs_delegation *delegation;
1880     int open_mode = opendata->o_arg.open_flags;
1881     fmode_t fmode = opendata->o_arg.fmode;
1882     enum open_claim_type4 claim = opendata->o_arg.claim;
1883     nfs4_stateid stateid;
1884     int ret = -EAGAIN;
1885 
1886     for (;;) {
1887         spin_lock(&state->owner->so_lock);
1888         if (can_open_cached(state, fmode, open_mode, claim)) {
1889             update_open_stateflags(state, fmode);
1890             spin_unlock(&state->owner->so_lock);
1891             goto out_return_state;
1892         }
1893         spin_unlock(&state->owner->so_lock);
1894         rcu_read_lock();
1895         delegation = nfs4_get_valid_delegation(state->inode);
1896         if (!can_open_delegated(delegation, fmode, claim)) {
1897             rcu_read_unlock();
1898             break;
1899         }
1900         /* Save the delegation */
1901         nfs4_stateid_copy(&stateid, &delegation->stateid);
1902         rcu_read_unlock();
1903         nfs_release_seqid(opendata->o_arg.seqid);
1904         if (!opendata->is_recover) {
1905             ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1906             if (ret != 0)
1907                 goto out;
1908         }
1909         ret = -EAGAIN;
1910 
1911         /* Try to update the stateid using the delegation */
1912         if (update_open_stateid(state, NULL, &stateid, fmode))
1913             goto out_return_state;
1914     }
1915 out:
1916     return ERR_PTR(ret);
1917 out_return_state:
1918     refcount_inc(&state->count);
1919     return state;
1920 }
1921 
1922 static void
1923 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1924 {
1925     struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1926     struct nfs_delegation *delegation;
1927     int delegation_flags = 0;
1928 
1929     rcu_read_lock();
1930     delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1931     if (delegation)
1932         delegation_flags = delegation->flags;
1933     rcu_read_unlock();
1934     switch (data->o_arg.claim) {
1935     default:
1936         break;
1937     case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1938     case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1939         pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1940                    "returning a delegation for "
1941                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1942                    clp->cl_hostname);
1943         return;
1944     }
1945     if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1946         nfs_inode_set_delegation(state->inode,
1947                 data->owner->so_cred,
1948                 data->o_res.delegation_type,
1949                 &data->o_res.delegation,
1950                 data->o_res.pagemod_limit);
1951     else
1952         nfs_inode_reclaim_delegation(state->inode,
1953                 data->owner->so_cred,
1954                 data->o_res.delegation_type,
1955                 &data->o_res.delegation,
1956                 data->o_res.pagemod_limit);
1957 
1958     if (data->o_res.do_recall)
1959         nfs_async_inode_return_delegation(state->inode,
1960                           &data->o_res.delegation);
1961 }
1962 
1963 /*
1964  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1965  * and update the nfs4_state.
1966  */
1967 static struct nfs4_state *
1968 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1969 {
1970     struct inode *inode = data->state->inode;
1971     struct nfs4_state *state = data->state;
1972     int ret;
1973 
1974     if (!data->rpc_done) {
1975         if (data->rpc_status)
1976             return ERR_PTR(data->rpc_status);
1977         /* cached opens have already been processed */
1978         goto update;
1979     }
1980 
1981     ret = nfs_refresh_inode(inode, &data->f_attr);
1982     if (ret)
1983         return ERR_PTR(ret);
1984 
1985     if (data->o_res.delegation_type != 0)
1986         nfs4_opendata_check_deleg(data, state);
1987 update:
1988     if (!update_open_stateid(state, &data->o_res.stateid,
1989                 NULL, data->o_arg.fmode))
1990         return ERR_PTR(-EAGAIN);
1991     refcount_inc(&state->count);
1992 
1993     return state;
1994 }
1995 
1996 static struct inode *
1997 nfs4_opendata_get_inode(struct nfs4_opendata *data)
1998 {
1999     struct inode *inode;
2000 
2001     switch (data->o_arg.claim) {
2002     case NFS4_OPEN_CLAIM_NULL:
2003     case NFS4_OPEN_CLAIM_DELEGATE_CUR:
2004     case NFS4_OPEN_CLAIM_DELEGATE_PREV:
2005         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
2006             return ERR_PTR(-EAGAIN);
2007         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh,
2008                 &data->f_attr);
2009         break;
2010     default:
2011         inode = d_inode(data->dentry);
2012         ihold(inode);
2013         nfs_refresh_inode(inode, &data->f_attr);
2014     }
2015     return inode;
2016 }
2017 
2018 static struct nfs4_state *
2019 nfs4_opendata_find_nfs4_state(struct nfs4_opendata *data)
2020 {
2021     struct nfs4_state *state;
2022     struct inode *inode;
2023 
2024     inode = nfs4_opendata_get_inode(data);
2025     if (IS_ERR(inode))
2026         return ERR_CAST(inode);
2027     if (data->state != NULL && data->state->inode == inode) {
2028         state = data->state;
2029         refcount_inc(&state->count);
2030     } else
2031         state = nfs4_get_open_state(inode, data->owner);
2032     iput(inode);
2033     if (state == NULL)
2034         state = ERR_PTR(-ENOMEM);
2035     return state;
2036 }
2037 
2038 static struct nfs4_state *
2039 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
2040 {
2041     struct nfs4_state *state;
2042 
2043     if (!data->rpc_done) {
2044         state = nfs4_try_open_cached(data);
2045         trace_nfs4_cached_open(data->state);
2046         goto out;
2047     }
2048 
2049     state = nfs4_opendata_find_nfs4_state(data);
2050     if (IS_ERR(state))
2051         goto out;
2052 
2053     if (data->o_res.delegation_type != 0)
2054         nfs4_opendata_check_deleg(data, state);
2055     if (!update_open_stateid(state, &data->o_res.stateid,
2056                 NULL, data->o_arg.fmode)) {
2057         nfs4_put_open_state(state);
2058         state = ERR_PTR(-EAGAIN);
2059     }
2060 out:
2061     nfs_release_seqid(data->o_arg.seqid);
2062     return state;
2063 }
2064 
2065 static struct nfs4_state *
2066 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
2067 {
2068     struct nfs4_state *ret;
2069 
2070     if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
2071         ret =_nfs4_opendata_reclaim_to_nfs4_state(data);
2072     else
2073         ret = _nfs4_opendata_to_nfs4_state(data);
2074     nfs4_sequence_free_slot(&data->o_res.seq_res);
2075     return ret;
2076 }
2077 
2078 static struct nfs_open_context *
2079 nfs4_state_find_open_context_mode(struct nfs4_state *state, fmode_t mode)
2080 {
2081     struct nfs_inode *nfsi = NFS_I(state->inode);
2082     struct nfs_open_context *ctx;
2083 
2084     rcu_read_lock();
2085     list_for_each_entry_rcu(ctx, &nfsi->open_files, list) {
2086         if (ctx->state != state)
2087             continue;
2088         if ((ctx->mode & mode) != mode)
2089             continue;
2090         if (!get_nfs_open_context(ctx))
2091             continue;
2092         rcu_read_unlock();
2093         return ctx;
2094     }
2095     rcu_read_unlock();
2096     return ERR_PTR(-ENOENT);
2097 }
2098 
2099 static struct nfs_open_context *
2100 nfs4_state_find_open_context(struct nfs4_state *state)
2101 {
2102     struct nfs_open_context *ctx;
2103 
2104     ctx = nfs4_state_find_open_context_mode(state, FMODE_READ|FMODE_WRITE);
2105     if (!IS_ERR(ctx))
2106         return ctx;
2107     ctx = nfs4_state_find_open_context_mode(state, FMODE_WRITE);
2108     if (!IS_ERR(ctx))
2109         return ctx;
2110     return nfs4_state_find_open_context_mode(state, FMODE_READ);
2111 }
2112 
2113 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
2114         struct nfs4_state *state, enum open_claim_type4 claim)
2115 {
2116     struct nfs4_opendata *opendata;
2117 
2118     opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
2119             NULL, claim, GFP_NOFS);
2120     if (opendata == NULL)
2121         return ERR_PTR(-ENOMEM);
2122     opendata->state = state;
2123     refcount_inc(&state->count);
2124     return opendata;
2125 }
2126 
2127 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata,
2128         fmode_t fmode)
2129 {
2130     struct nfs4_state *newstate;
2131     int ret;
2132 
2133     if (!nfs4_mode_match_open_stateid(opendata->state, fmode))
2134         return 0;
2135     opendata->o_arg.open_flags = 0;
2136     opendata->o_arg.fmode = fmode;
2137     opendata->o_arg.share_access = nfs4_map_atomic_open_share(
2138             NFS_SB(opendata->dentry->d_sb),
2139             fmode, 0);
2140     memset(&opendata->o_res, 0, sizeof(opendata->o_res));
2141     memset(&opendata->c_res, 0, sizeof(opendata->c_res));
2142     nfs4_init_opendata_res(opendata);
2143     ret = _nfs4_recover_proc_open(opendata);
2144     if (ret != 0)
2145         return ret; 
2146     newstate = nfs4_opendata_to_nfs4_state(opendata);
2147     if (IS_ERR(newstate))
2148         return PTR_ERR(newstate);
2149     if (newstate != opendata->state)
2150         ret = -ESTALE;
2151     nfs4_close_state(newstate, fmode);
2152     return ret;
2153 }
2154 
2155 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
2156 {
2157     int ret;
2158 
2159     /* memory barrier prior to reading state->n_* */
2160     smp_rmb();
2161     ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
2162     if (ret != 0)
2163         return ret;
2164     ret = nfs4_open_recover_helper(opendata, FMODE_WRITE);
2165     if (ret != 0)
2166         return ret;
2167     ret = nfs4_open_recover_helper(opendata, FMODE_READ);
2168     if (ret != 0)
2169         return ret;
2170     /*
2171      * We may have performed cached opens for all three recoveries.
2172      * Check if we need to update the current stateid.
2173      */
2174     if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
2175         !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
2176         write_seqlock(&state->seqlock);
2177         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
2178             nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2179         write_sequnlock(&state->seqlock);
2180     }
2181     return 0;
2182 }
2183 
2184 /*
2185  * OPEN_RECLAIM:
2186  *  reclaim state on the server after a reboot.
2187  */
2188 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
2189 {
2190     struct nfs_delegation *delegation;
2191     struct nfs4_opendata *opendata;
2192     fmode_t delegation_type = 0;
2193     int status;
2194 
2195     opendata = nfs4_open_recoverdata_alloc(ctx, state,
2196             NFS4_OPEN_CLAIM_PREVIOUS);
2197     if (IS_ERR(opendata))
2198         return PTR_ERR(opendata);
2199     rcu_read_lock();
2200     delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2201     if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
2202         delegation_type = delegation->type;
2203     rcu_read_unlock();
2204     opendata->o_arg.u.delegation_type = delegation_type;
2205     status = nfs4_open_recover(opendata, state);
2206     nfs4_opendata_put(opendata);
2207     return status;
2208 }
2209 
2210 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
2211 {
2212     struct nfs_server *server = NFS_SERVER(state->inode);
2213     struct nfs4_exception exception = { };
2214     int err;
2215     do {
2216         err = _nfs4_do_open_reclaim(ctx, state);
2217         trace_nfs4_open_reclaim(ctx, 0, err);
2218         if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2219             continue;
2220         if (err != -NFS4ERR_DELAY)
2221             break;
2222         nfs4_handle_exception(server, err, &exception);
2223     } while (exception.retry);
2224     return err;
2225 }
2226 
2227 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
2228 {
2229     struct nfs_open_context *ctx;
2230     int ret;
2231 
2232     ctx = nfs4_state_find_open_context(state);
2233     if (IS_ERR(ctx))
2234         return -EAGAIN;
2235     clear_bit(NFS_DELEGATED_STATE, &state->flags);
2236     nfs_state_clear_open_state_flags(state);
2237     ret = nfs4_do_open_reclaim(ctx, state);
2238     put_nfs_open_context(ctx);
2239     return ret;
2240 }
2241 
2242 static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, struct file_lock *fl, int err)
2243 {
2244     switch (err) {
2245         default:
2246             printk(KERN_ERR "NFS: %s: unhandled error "
2247                     "%d.\n", __func__, err);
2248             fallthrough;
2249         case 0:
2250         case -ENOENT:
2251         case -EAGAIN:
2252         case -ESTALE:
2253         case -ETIMEDOUT:
2254             break;
2255         case -NFS4ERR_BADSESSION:
2256         case -NFS4ERR_BADSLOT:
2257         case -NFS4ERR_BAD_HIGH_SLOT:
2258         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
2259         case -NFS4ERR_DEADSESSION:
2260             return -EAGAIN;
2261         case -NFS4ERR_STALE_CLIENTID:
2262         case -NFS4ERR_STALE_STATEID:
2263             /* Don't recall a delegation if it was lost */
2264             nfs4_schedule_lease_recovery(server->nfs_client);
2265             return -EAGAIN;
2266         case -NFS4ERR_MOVED:
2267             nfs4_schedule_migration_recovery(server);
2268             return -EAGAIN;
2269         case -NFS4ERR_LEASE_MOVED:
2270             nfs4_schedule_lease_moved_recovery(server->nfs_client);
2271             return -EAGAIN;
2272         case -NFS4ERR_DELEG_REVOKED:
2273         case -NFS4ERR_ADMIN_REVOKED:
2274         case -NFS4ERR_EXPIRED:
2275         case -NFS4ERR_BAD_STATEID:
2276         case -NFS4ERR_OPENMODE:
2277             nfs_inode_find_state_and_recover(state->inode,
2278                     stateid);
2279             nfs4_schedule_stateid_recovery(server, state);
2280             return -EAGAIN;
2281         case -NFS4ERR_DELAY:
2282         case -NFS4ERR_GRACE:
2283             ssleep(1);
2284             return -EAGAIN;
2285         case -ENOMEM:
2286         case -NFS4ERR_DENIED:
2287             if (fl) {
2288                 struct nfs4_lock_state *lsp = fl->fl_u.nfs4_fl.owner;
2289                 if (lsp)
2290                     set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
2291             }
2292             return 0;
2293     }
2294     return err;
2295 }
2296 
2297 int nfs4_open_delegation_recall(struct nfs_open_context *ctx,
2298         struct nfs4_state *state, const nfs4_stateid *stateid)
2299 {
2300     struct nfs_server *server = NFS_SERVER(state->inode);
2301     struct nfs4_opendata *opendata;
2302     int err = 0;
2303 
2304     opendata = nfs4_open_recoverdata_alloc(ctx, state,
2305             NFS4_OPEN_CLAIM_DELEG_CUR_FH);
2306     if (IS_ERR(opendata))
2307         return PTR_ERR(opendata);
2308     nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
2309     if (!test_bit(NFS_O_RDWR_STATE, &state->flags)) {
2310         err = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
2311         if (err)
2312             goto out;
2313     }
2314     if (!test_bit(NFS_O_WRONLY_STATE, &state->flags)) {
2315         err = nfs4_open_recover_helper(opendata, FMODE_WRITE);
2316         if (err)
2317             goto out;
2318     }
2319     if (!test_bit(NFS_O_RDONLY_STATE, &state->flags)) {
2320         err = nfs4_open_recover_helper(opendata, FMODE_READ);
2321         if (err)
2322             goto out;
2323     }
2324     nfs_state_clear_delegation(state);
2325 out:
2326     nfs4_opendata_put(opendata);
2327     return nfs4_handle_delegation_recall_error(server, state, stateid, NULL, err);
2328 }
2329 
2330 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
2331 {
2332     struct nfs4_opendata *data = calldata;
2333 
2334     nfs4_setup_sequence(data->o_arg.server->nfs_client,
2335                &data->c_arg.seq_args, &data->c_res.seq_res, task);
2336 }
2337 
2338 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
2339 {
2340     struct nfs4_opendata *data = calldata;
2341 
2342     nfs40_sequence_done(task, &data->c_res.seq_res);
2343 
2344     data->rpc_status = task->tk_status;
2345     if (data->rpc_status == 0) {
2346         nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
2347         nfs_confirm_seqid(&data->owner->so_seqid, 0);
2348         renew_lease(data->o_res.server, data->timestamp);
2349         data->rpc_done = true;
2350     }
2351 }
2352 
2353 static void nfs4_open_confirm_release(void *calldata)
2354 {
2355     struct nfs4_opendata *data = calldata;
2356     struct nfs4_state *state = NULL;
2357 
2358     /* If this request hasn't been cancelled, do nothing */
2359     if (!data->cancelled)
2360         goto out_free;
2361     /* In case of error, no cleanup! */
2362     if (!data->rpc_done)
2363         goto out_free;
2364     state = nfs4_opendata_to_nfs4_state(data);
2365     if (!IS_ERR(state))
2366         nfs4_close_state(state, data->o_arg.fmode);
2367 out_free:
2368     nfs4_opendata_put(data);
2369 }
2370 
2371 static const struct rpc_call_ops nfs4_open_confirm_ops = {
2372     .rpc_call_prepare = nfs4_open_confirm_prepare,
2373     .rpc_call_done = nfs4_open_confirm_done,
2374     .rpc_release = nfs4_open_confirm_release,
2375 };
2376 
2377 /*
2378  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
2379  */
2380 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
2381 {
2382     struct nfs_server *server = NFS_SERVER(d_inode(data->dir));
2383     struct rpc_task *task;
2384     struct  rpc_message msg = {
2385         .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
2386         .rpc_argp = &data->c_arg,
2387         .rpc_resp = &data->c_res,
2388         .rpc_cred = data->owner->so_cred,
2389     };
2390     struct rpc_task_setup task_setup_data = {
2391         .rpc_client = server->client,
2392         .rpc_message = &msg,
2393         .callback_ops = &nfs4_open_confirm_ops,
2394         .callback_data = data,
2395         .workqueue = nfsiod_workqueue,
2396         .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
2397     };
2398     int status;
2399 
2400     nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1,
2401                 data->is_recover);
2402     kref_get(&data->kref);
2403     data->rpc_done = false;
2404     data->rpc_status = 0;
2405     data->timestamp = jiffies;
2406     task = rpc_run_task(&task_setup_data);
2407     if (IS_ERR(task))
2408         return PTR_ERR(task);
2409     status = rpc_wait_for_completion_task(task);
2410     if (status != 0) {
2411         data->cancelled = true;
2412         smp_wmb();
2413     } else
2414         status = data->rpc_status;
2415     rpc_put_task(task);
2416     return status;
2417 }
2418 
2419 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
2420 {
2421     struct nfs4_opendata *data = calldata;
2422     struct nfs4_state_owner *sp = data->owner;
2423     struct nfs_client *clp = sp->so_server->nfs_client;
2424     enum open_claim_type4 claim = data->o_arg.claim;
2425 
2426     if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
2427         goto out_wait;
2428     /*
2429      * Check if we still need to send an OPEN call, or if we can use
2430      * a delegation instead.
2431      */
2432     if (data->state != NULL) {
2433         struct nfs_delegation *delegation;
2434 
2435         if (can_open_cached(data->state, data->o_arg.fmode,
2436                     data->o_arg.open_flags, claim))
2437             goto out_no_action;
2438         rcu_read_lock();
2439         delegation = nfs4_get_valid_delegation(data->state->inode);
2440         if (can_open_delegated(delegation, data->o_arg.fmode, claim))
2441             goto unlock_no_action;
2442         rcu_read_unlock();
2443     }
2444     /* Update client id. */
2445     data->o_arg.clientid = clp->cl_clientid;
2446     switch (claim) {
2447     default:
2448         break;
2449     case NFS4_OPEN_CLAIM_PREVIOUS:
2450     case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
2451     case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
2452         data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
2453         fallthrough;
2454     case NFS4_OPEN_CLAIM_FH:
2455         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
2456     }
2457     data->timestamp = jiffies;
2458     if (nfs4_setup_sequence(data->o_arg.server->nfs_client,
2459                 &data->o_arg.seq_args,
2460                 &data->o_res.seq_res,
2461                 task) != 0)
2462         nfs_release_seqid(data->o_arg.seqid);
2463 
2464     /* Set the create mode (note dependency on the session type) */
2465     data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
2466     if (data->o_arg.open_flags & O_EXCL) {
2467         data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
2468         if (clp->cl_mvops->minor_version == 0) {
2469             data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
2470             /* don't put an ACCESS op in OPEN compound if O_EXCL,
2471              * because ACCESS will return permission denied for
2472              * all bits until close */
2473             data->o_res.access_request = data->o_arg.access = 0;
2474         } else if (nfs4_has_persistent_session(clp))
2475             data->o_arg.createmode = NFS4_CREATE_GUARDED;
2476     }
2477     return;
2478 unlock_no_action:
2479     trace_nfs4_cached_open(data->state);
2480     rcu_read_unlock();
2481 out_no_action:
2482     task->tk_action = NULL;
2483 out_wait:
2484     nfs4_sequence_done(task, &data->o_res.seq_res);
2485 }
2486 
2487 static void nfs4_open_done(struct rpc_task *task, void *calldata)
2488 {
2489     struct nfs4_opendata *data = calldata;
2490 
2491     data->rpc_status = task->tk_status;
2492 
2493     if (!nfs4_sequence_process(task, &data->o_res.seq_res))
2494         return;
2495 
2496     if (task->tk_status == 0) {
2497         if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
2498             switch (data->o_res.f_attr->mode & S_IFMT) {
2499             case S_IFREG:
2500                 break;
2501             case S_IFLNK:
2502                 data->rpc_status = -ELOOP;
2503                 break;
2504             case S_IFDIR:
2505                 data->rpc_status = -EISDIR;
2506                 break;
2507             default:
2508                 data->rpc_status = -ENOTDIR;
2509             }
2510         }
2511         renew_lease(data->o_res.server, data->timestamp);
2512         if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
2513             nfs_confirm_seqid(&data->owner->so_seqid, 0);
2514     }
2515     data->rpc_done = true;
2516 }
2517 
2518 static void nfs4_open_release(void *calldata)
2519 {
2520     struct nfs4_opendata *data = calldata;
2521     struct nfs4_state *state = NULL;
2522 
2523     /* If this request hasn't been cancelled, do nothing */
2524     if (!data->cancelled)
2525         goto out_free;
2526     /* In case of error, no cleanup! */
2527     if (data->rpc_status != 0 || !data->rpc_done)
2528         goto out_free;
2529     /* In case we need an open_confirm, no cleanup! */
2530     if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
2531         goto out_free;
2532     state = nfs4_opendata_to_nfs4_state(data);
2533     if (!IS_ERR(state))
2534         nfs4_close_state(state, data->o_arg.fmode);
2535 out_free:
2536     nfs4_opendata_put(data);
2537 }
2538 
2539 static const struct rpc_call_ops nfs4_open_ops = {
2540     .rpc_call_prepare = nfs4_open_prepare,
2541     .rpc_call_done = nfs4_open_done,
2542     .rpc_release = nfs4_open_release,
2543 };
2544 
2545 static int nfs4_run_open_task(struct nfs4_opendata *data,
2546                   struct nfs_open_context *ctx)
2547 {
2548     struct inode *dir = d_inode(data->dir);
2549     struct nfs_server *server = NFS_SERVER(dir);
2550     struct nfs_openargs *o_arg = &data->o_arg;
2551     struct nfs_openres *o_res = &data->o_res;
2552     struct rpc_task *task;
2553     struct rpc_message msg = {
2554         .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
2555         .rpc_argp = o_arg,
2556         .rpc_resp = o_res,
2557         .rpc_cred = data->owner->so_cred,
2558     };
2559     struct rpc_task_setup task_setup_data = {
2560         .rpc_client = server->client,
2561         .rpc_message = &msg,
2562         .callback_ops = &nfs4_open_ops,
2563         .callback_data = data,
2564         .workqueue = nfsiod_workqueue,
2565         .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
2566     };
2567     int status;
2568 
2569     if (nfs_server_capable(dir, NFS_CAP_MOVEABLE))
2570         task_setup_data.flags |= RPC_TASK_MOVEABLE;
2571 
2572     kref_get(&data->kref);
2573     data->rpc_done = false;
2574     data->rpc_status = 0;
2575     data->cancelled = false;
2576     data->is_recover = false;
2577     if (!ctx) {
2578         nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 1);
2579         data->is_recover = true;
2580         task_setup_data.flags |= RPC_TASK_TIMEOUT;
2581     } else {
2582         nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 0);
2583         pnfs_lgopen_prepare(data, ctx);
2584     }
2585     task = rpc_run_task(&task_setup_data);
2586     if (IS_ERR(task))
2587         return PTR_ERR(task);
2588     status = rpc_wait_for_completion_task(task);
2589     if (status != 0) {
2590         data->cancelled = true;
2591         smp_wmb();
2592     } else
2593         status = data->rpc_status;
2594     rpc_put_task(task);
2595 
2596     return status;
2597 }
2598 
2599 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
2600 {
2601     struct inode *dir = d_inode(data->dir);
2602     struct nfs_openres *o_res = &data->o_res;
2603     int status;
2604 
2605     status = nfs4_run_open_task(data, NULL);
2606     if (status != 0 || !data->rpc_done)
2607         return status;
2608 
2609     nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
2610 
2611     if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM)
2612         status = _nfs4_proc_open_confirm(data);
2613 
2614     return status;
2615 }
2616 
2617 /*
2618  * Additional permission checks in order to distinguish between an
2619  * open for read, and an open for execute. This works around the
2620  * fact that NFSv4 OPEN treats read and execute permissions as being
2621  * the same.
2622  * Note that in the non-execute case, we want to turn off permission
2623  * checking if we just created a new file (POSIX open() semantics).
2624  */
2625 static int nfs4_opendata_access(const struct cred *cred,
2626                 struct nfs4_opendata *opendata,
2627                 struct nfs4_state *state, fmode_t fmode,
2628                 int openflags)
2629 {
2630     struct nfs_access_entry cache;
2631     u32 mask, flags;
2632 
2633     /* access call failed or for some reason the server doesn't
2634      * support any access modes -- defer access call until later */
2635     if (opendata->o_res.access_supported == 0)
2636         return 0;
2637 
2638     mask = 0;
2639     /*
2640      * Use openflags to check for exec, because fmode won't
2641      * always have FMODE_EXEC set when file open for exec.
2642      */
2643     if (openflags & __FMODE_EXEC) {
2644         /* ONLY check for exec rights */
2645         if (S_ISDIR(state->inode->i_mode))
2646             mask = NFS4_ACCESS_LOOKUP;
2647         else
2648             mask = NFS4_ACCESS_EXECUTE;
2649     } else if ((fmode & FMODE_READ) && !opendata->file_created)
2650         mask = NFS4_ACCESS_READ;
2651 
2652     nfs_access_set_mask(&cache, opendata->o_res.access_result);
2653     nfs_access_add_cache(state->inode, &cache, cred);
2654 
2655     flags = NFS4_ACCESS_READ | NFS4_ACCESS_EXECUTE | NFS4_ACCESS_LOOKUP;
2656     if ((mask & ~cache.mask & flags) == 0)
2657         return 0;
2658 
2659     return -EACCES;
2660 }
2661 
2662 /*
2663  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
2664  */
2665 static int _nfs4_proc_open(struct nfs4_opendata *data,
2666                struct nfs_open_context *ctx)
2667 {
2668     struct inode *dir = d_inode(data->dir);
2669     struct nfs_server *server = NFS_SERVER(dir);
2670     struct nfs_openargs *o_arg = &data->o_arg;
2671     struct nfs_openres *o_res = &data->o_res;
2672     int status;
2673 
2674     status = nfs4_run_open_task(data, ctx);
2675     if (!data->rpc_done)
2676         return status;
2677     if (status != 0) {
2678         if (status == -NFS4ERR_BADNAME &&
2679                 !(o_arg->open_flags & O_CREAT))
2680             return -ENOENT;
2681         return status;
2682     }
2683 
2684     nfs_fattr_map_and_free_names(server, &data->f_attr);
2685 
2686     if (o_arg->open_flags & O_CREAT) {
2687         if (o_arg->open_flags & O_EXCL)
2688             data->file_created = true;
2689         else if (o_res->cinfo.before != o_res->cinfo.after)
2690             data->file_created = true;
2691         if (data->file_created ||
2692             inode_peek_iversion_raw(dir) != o_res->cinfo.after)
2693             nfs4_update_changeattr(dir, &o_res->cinfo,
2694                     o_res->f_attr->time_start,
2695                     NFS_INO_INVALID_DATA);
2696     }
2697     if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
2698         server->caps &= ~NFS_CAP_POSIX_LOCK;
2699     if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2700         status = _nfs4_proc_open_confirm(data);
2701         if (status != 0)
2702             return status;
2703     }
2704     if (!(o_res->f_attr->valid & NFS_ATTR_FATTR)) {
2705         nfs4_sequence_free_slot(&o_res->seq_res);
2706         nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, NULL);
2707     }
2708     return 0;
2709 }
2710 
2711 /*
2712  * OPEN_EXPIRED:
2713  *  reclaim state on the server after a network partition.
2714  *  Assumes caller holds the appropriate lock
2715  */
2716 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2717 {
2718     struct nfs4_opendata *opendata;
2719     int ret;
2720 
2721     opendata = nfs4_open_recoverdata_alloc(ctx, state,
2722             NFS4_OPEN_CLAIM_FH);
2723     if (IS_ERR(opendata))
2724         return PTR_ERR(opendata);
2725     ret = nfs4_open_recover(opendata, state);
2726     if (ret == -ESTALE)
2727         d_drop(ctx->dentry);
2728     nfs4_opendata_put(opendata);
2729     return ret;
2730 }
2731 
2732 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2733 {
2734     struct nfs_server *server = NFS_SERVER(state->inode);
2735     struct nfs4_exception exception = { };
2736     int err;
2737 
2738     do {
2739         err = _nfs4_open_expired(ctx, state);
2740         trace_nfs4_open_expired(ctx, 0, err);
2741         if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2742             continue;
2743         switch (err) {
2744         default:
2745             goto out;
2746         case -NFS4ERR_GRACE:
2747         case -NFS4ERR_DELAY:
2748             nfs4_handle_exception(server, err, &exception);
2749             err = 0;
2750         }
2751     } while (exception.retry);
2752 out:
2753     return err;
2754 }
2755 
2756 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2757 {
2758     struct nfs_open_context *ctx;
2759     int ret;
2760 
2761     ctx = nfs4_state_find_open_context(state);
2762     if (IS_ERR(ctx))
2763         return -EAGAIN;
2764     ret = nfs4_do_open_expired(ctx, state);
2765     put_nfs_open_context(ctx);
2766     return ret;
2767 }
2768 
2769 static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state,
2770         const nfs4_stateid *stateid)
2771 {
2772     nfs_remove_bad_delegation(state->inode, stateid);
2773     nfs_state_clear_delegation(state);
2774 }
2775 
2776 static void nfs40_clear_delegation_stateid(struct nfs4_state *state)
2777 {
2778     if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL)
2779         nfs_finish_clear_delegation_stateid(state, NULL);
2780 }
2781 
2782 static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2783 {
2784     /* NFSv4.0 doesn't allow for delegation recovery on open expire */
2785     nfs40_clear_delegation_stateid(state);
2786     nfs_state_clear_open_state_flags(state);
2787     return nfs4_open_expired(sp, state);
2788 }
2789 
2790 static int nfs40_test_and_free_expired_stateid(struct nfs_server *server,
2791         nfs4_stateid *stateid,
2792         const struct cred *cred)
2793 {
2794     return -NFS4ERR_BAD_STATEID;
2795 }
2796 
2797 #if defined(CONFIG_NFS_V4_1)
2798 static int nfs41_test_and_free_expired_stateid(struct nfs_server *server,
2799         nfs4_stateid *stateid,
2800         const struct cred *cred)
2801 {
2802     int status;
2803 
2804     switch (stateid->type) {
2805     default:
2806         break;
2807     case NFS4_INVALID_STATEID_TYPE:
2808     case NFS4_SPECIAL_STATEID_TYPE:
2809         return -NFS4ERR_BAD_STATEID;
2810     case NFS4_REVOKED_STATEID_TYPE:
2811         goto out_free;
2812     }
2813 
2814     status = nfs41_test_stateid(server, stateid, cred);
2815     switch (status) {
2816     case -NFS4ERR_EXPIRED:
2817     case -NFS4ERR_ADMIN_REVOKED:
2818     case -NFS4ERR_DELEG_REVOKED:
2819         break;
2820     default:
2821         return status;
2822     }
2823 out_free:
2824     /* Ack the revoked state to the server */
2825     nfs41_free_stateid(server, stateid, cred, true);
2826     return -NFS4ERR_EXPIRED;
2827 }
2828 
2829 static int nfs41_check_delegation_stateid(struct nfs4_state *state)
2830 {
2831     struct nfs_server *server = NFS_SERVER(state->inode);
2832     nfs4_stateid stateid;
2833     struct nfs_delegation *delegation;
2834     const struct cred *cred = NULL;
2835     int status, ret = NFS_OK;
2836 
2837     /* Get the delegation credential for use by test/free_stateid */
2838     rcu_read_lock();
2839     delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2840     if (delegation == NULL) {
2841         rcu_read_unlock();
2842         nfs_state_clear_delegation(state);
2843         return NFS_OK;
2844     }
2845 
2846     spin_lock(&delegation->lock);
2847     nfs4_stateid_copy(&stateid, &delegation->stateid);
2848 
2849     if (!test_and_clear_bit(NFS_DELEGATION_TEST_EXPIRED,
2850                 &delegation->flags)) {
2851         spin_unlock(&delegation->lock);
2852         rcu_read_unlock();
2853         return NFS_OK;
2854     }
2855 
2856     if (delegation->cred)
2857         cred = get_cred(delegation->cred);
2858     spin_unlock(&delegation->lock);
2859     rcu_read_unlock();
2860     status = nfs41_test_and_free_expired_stateid(server, &stateid, cred);
2861     trace_nfs4_test_delegation_stateid(state, NULL, status);
2862     if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID)
2863         nfs_finish_clear_delegation_stateid(state, &stateid);
2864     else
2865         ret = status;
2866 
2867     put_cred(cred);
2868     return ret;
2869 }
2870 
2871 static void nfs41_delegation_recover_stateid(struct nfs4_state *state)
2872 {
2873     nfs4_stateid tmp;
2874 
2875     if (test_bit(NFS_DELEGATED_STATE, &state->flags) &&
2876         nfs4_copy_delegation_stateid(state->inode, state->state,
2877                 &tmp, NULL) &&
2878         nfs4_stateid_match_other(&state->stateid, &tmp))
2879         nfs_state_set_delegation(state, &tmp, state->state);
2880     else
2881         nfs_state_clear_delegation(state);
2882 }
2883 
2884 /**
2885  * nfs41_check_expired_locks - possibly free a lock stateid
2886  *
2887  * @state: NFSv4 state for an inode
2888  *
2889  * Returns NFS_OK if recovery for this stateid is now finished.
2890  * Otherwise a negative NFS4ERR value is returned.
2891  */
2892 static int nfs41_check_expired_locks(struct nfs4_state *state)
2893 {
2894     int status, ret = NFS_OK;
2895     struct nfs4_lock_state *lsp, *prev = NULL;
2896     struct nfs_server *server = NFS_SERVER(state->inode);
2897 
2898     if (!test_bit(LK_STATE_IN_USE, &state->flags))
2899         goto out;
2900 
2901     spin_lock(&state->state_lock);
2902     list_for_each_entry(lsp, &state->lock_states, ls_locks) {
2903         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
2904             const struct cred *cred = lsp->ls_state->owner->so_cred;
2905 
2906             refcount_inc(&lsp->ls_count);
2907             spin_unlock(&state->state_lock);
2908 
2909             nfs4_put_lock_state(prev);
2910             prev = lsp;
2911 
2912             status = nfs41_test_and_free_expired_stateid(server,
2913                     &lsp->ls_stateid,
2914                     cred);
2915             trace_nfs4_test_lock_stateid(state, lsp, status);
2916             if (status == -NFS4ERR_EXPIRED ||
2917                 status == -NFS4ERR_BAD_STATEID) {
2918                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
2919                 lsp->ls_stateid.type = NFS4_INVALID_STATEID_TYPE;
2920                 if (!recover_lost_locks)
2921                     set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
2922             } else if (status != NFS_OK) {
2923                 ret = status;
2924                 nfs4_put_lock_state(prev);
2925                 goto out;
2926             }
2927             spin_lock(&state->state_lock);
2928         }
2929     }
2930     spin_unlock(&state->state_lock);
2931     nfs4_put_lock_state(prev);
2932 out:
2933     return ret;
2934 }
2935 
2936 /**
2937  * nfs41_check_open_stateid - possibly free an open stateid
2938  *
2939  * @state: NFSv4 state for an inode
2940  *
2941  * Returns NFS_OK if recovery for this stateid is now finished.
2942  * Otherwise a negative NFS4ERR value is returned.
2943  */
2944 static int nfs41_check_open_stateid(struct nfs4_state *state)
2945 {
2946     struct nfs_server *server = NFS_SERVER(state->inode);
2947     nfs4_stateid *stateid = &state->open_stateid;
2948     const struct cred *cred = state->owner->so_cred;
2949     int status;
2950 
2951     if (test_bit(NFS_OPEN_STATE, &state->flags) == 0)
2952         return -NFS4ERR_BAD_STATEID;
2953     status = nfs41_test_and_free_expired_stateid(server, stateid, cred);
2954     trace_nfs4_test_open_stateid(state, NULL, status);
2955     if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID) {
2956         nfs_state_clear_open_state_flags(state);
2957         stateid->type = NFS4_INVALID_STATEID_TYPE;
2958         return status;
2959     }
2960     if (nfs_open_stateid_recover_openmode(state))
2961         return -NFS4ERR_OPENMODE;
2962     return NFS_OK;
2963 }
2964 
2965 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2966 {
2967     int status;
2968 
2969     status = nfs41_check_delegation_stateid(state);
2970     if (status != NFS_OK)
2971         return status;
2972     nfs41_delegation_recover_stateid(state);
2973 
2974     status = nfs41_check_expired_locks(state);
2975     if (status != NFS_OK)
2976         return status;
2977     status = nfs41_check_open_stateid(state);
2978     if (status != NFS_OK)
2979         status = nfs4_open_expired(sp, state);
2980     return status;
2981 }
2982 #endif
2983 
2984 /*
2985  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
2986  * fields corresponding to attributes that were used to store the verifier.
2987  * Make sure we clobber those fields in the later setattr call
2988  */
2989 static unsigned nfs4_exclusive_attrset(struct nfs4_opendata *opendata,
2990                 struct iattr *sattr, struct nfs4_label **label)
2991 {
2992     const __u32 *bitmask = opendata->o_arg.server->exclcreat_bitmask;
2993     __u32 attrset[3];
2994     unsigned ret;
2995     unsigned i;
2996 
2997     for (i = 0; i < ARRAY_SIZE(attrset); i++) {
2998         attrset[i] = opendata->o_res.attrset[i];
2999         if (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE4_1)
3000             attrset[i] &= ~bitmask[i];
3001     }
3002 
3003     ret = (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE) ?
3004         sattr->ia_valid : 0;
3005 
3006     if ((attrset[1] & (FATTR4_WORD1_TIME_ACCESS|FATTR4_WORD1_TIME_ACCESS_SET))) {
3007         if (sattr->ia_valid & ATTR_ATIME_SET)
3008             ret |= ATTR_ATIME_SET;
3009         else
3010             ret |= ATTR_ATIME;
3011     }
3012 
3013     if ((attrset[1] & (FATTR4_WORD1_TIME_MODIFY|FATTR4_WORD1_TIME_MODIFY_SET))) {
3014         if (sattr->ia_valid & ATTR_MTIME_SET)
3015             ret |= ATTR_MTIME_SET;
3016         else
3017             ret |= ATTR_MTIME;
3018     }
3019 
3020     if (!(attrset[2] & FATTR4_WORD2_SECURITY_LABEL))
3021         *label = NULL;
3022     return ret;
3023 }
3024 
3025 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
3026         int flags, struct nfs_open_context *ctx)
3027 {
3028     struct nfs4_state_owner *sp = opendata->owner;
3029     struct nfs_server *server = sp->so_server;
3030     struct dentry *dentry;
3031     struct nfs4_state *state;
3032     fmode_t acc_mode = _nfs4_ctx_to_accessmode(ctx);
3033     struct inode *dir = d_inode(opendata->dir);
3034     unsigned long dir_verifier;
3035     unsigned int seq;
3036     int ret;
3037 
3038     seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
3039     dir_verifier = nfs_save_change_attribute(dir);
3040 
3041     ret = _nfs4_proc_open(opendata, ctx);
3042     if (ret != 0)
3043         goto out;
3044 
3045     state = _nfs4_opendata_to_nfs4_state(opendata);
3046     ret = PTR_ERR(state);
3047     if (IS_ERR(state))
3048         goto out;
3049     ctx->state = state;
3050     if (server->caps & NFS_CAP_POSIX_LOCK)
3051         set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
3052     if (opendata->o_res.rflags & NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK)
3053         set_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags);
3054     if (opendata->o_res.rflags & NFS4_OPEN_RESULT_PRESERVE_UNLINKED)
3055         set_bit(NFS_INO_PRESERVE_UNLINKED, &NFS_I(state->inode)->flags);
3056 
3057     dentry = opendata->dentry;
3058     if (d_really_is_negative(dentry)) {
3059         struct dentry *alias;
3060         d_drop(dentry);
3061         alias = d_exact_alias(dentry, state->inode);
3062         if (!alias)
3063             alias = d_splice_alias(igrab(state->inode), dentry);
3064         /* d_splice_alias() can't fail here - it's a non-directory */
3065         if (alias) {
3066             dput(ctx->dentry);
3067             ctx->dentry = dentry = alias;
3068         }
3069     }
3070 
3071     switch(opendata->o_arg.claim) {
3072     default:
3073         break;
3074     case NFS4_OPEN_CLAIM_NULL:
3075     case NFS4_OPEN_CLAIM_DELEGATE_CUR:
3076     case NFS4_OPEN_CLAIM_DELEGATE_PREV:
3077         if (!opendata->rpc_done)
3078             break;
3079         if (opendata->o_res.delegation_type != 0)
3080             dir_verifier = nfs_save_change_attribute(dir);
3081         nfs_set_verifier(dentry, dir_verifier);
3082     }
3083 
3084     /* Parse layoutget results before we check for access */
3085     pnfs_parse_lgopen(state->inode, opendata->lgp, ctx);
3086 
3087     ret = nfs4_opendata_access(sp->so_cred, opendata, state,
3088             acc_mode, flags);
3089     if (ret != 0)
3090         goto out;
3091 
3092     if (d_inode(dentry) == state->inode) {
3093         nfs_inode_attach_open_context(ctx);
3094         if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
3095             nfs4_schedule_stateid_recovery(server, state);
3096     }
3097 
3098 out:
3099     if (!opendata->cancelled) {
3100         if (opendata->lgp) {
3101             nfs4_lgopen_release(opendata->lgp);
3102             opendata->lgp = NULL;
3103         }
3104         nfs4_sequence_free_slot(&opendata->o_res.seq_res);
3105     }
3106     return ret;
3107 }
3108 
3109 /*
3110  * Returns a referenced nfs4_state
3111  */
3112 static int _nfs4_do_open(struct inode *dir,
3113             struct nfs_open_context *ctx,
3114             int flags,
3115             const struct nfs4_open_createattrs *c,
3116             int *opened)
3117 {
3118     struct nfs4_state_owner  *sp;
3119     struct nfs4_state     *state = NULL;
3120     struct nfs_server       *server = NFS_SERVER(dir);
3121     struct nfs4_opendata *opendata;
3122     struct dentry *dentry = ctx->dentry;
3123     const struct cred *cred = ctx->cred;
3124     struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
3125     fmode_t fmode = _nfs4_ctx_to_openmode(ctx);
3126     enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
3127     struct iattr *sattr = c->sattr;
3128     struct nfs4_label *label = c->label;
3129     int status;
3130 
3131     /* Protect against reboot recovery conflicts */
3132     status = -ENOMEM;
3133     sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
3134     if (sp == NULL) {
3135         dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
3136         goto out_err;
3137     }
3138     status = nfs4_client_recover_expired_lease(server->nfs_client);
3139     if (status != 0)
3140         goto err_put_state_owner;
3141     if (d_really_is_positive(dentry))
3142         nfs4_return_incompatible_delegation(d_inode(dentry), fmode);
3143     status = -ENOMEM;
3144     if (d_really_is_positive(dentry))
3145         claim = NFS4_OPEN_CLAIM_FH;
3146     opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags,
3147             c, claim, GFP_KERNEL);
3148     if (opendata == NULL)
3149         goto err_put_state_owner;
3150 
3151     if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
3152         if (!opendata->f_attr.mdsthreshold) {
3153             opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
3154             if (!opendata->f_attr.mdsthreshold)
3155                 goto err_opendata_put;
3156         }
3157         opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
3158     }
3159     if (d_really_is_positive(dentry))
3160         opendata->state = nfs4_get_open_state(d_inode(dentry), sp);
3161 
3162     status = _nfs4_open_and_get_state(opendata, flags, ctx);
3163     if (status != 0)
3164         goto err_opendata_put;
3165     state = ctx->state;
3166 
3167     if ((opendata->o_arg.open_flags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL) &&
3168         (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
3169         unsigned attrs = nfs4_exclusive_attrset(opendata, sattr, &label);
3170         /*
3171          * send create attributes which was not set by open
3172          * with an extra setattr.
3173          */
3174         if (attrs || label) {
3175             unsigned ia_old = sattr->ia_valid;
3176 
3177             sattr->ia_valid = attrs;
3178             nfs_fattr_init(opendata->o_res.f_attr);
3179             status = nfs4_do_setattr(state->inode, cred,
3180                     opendata->o_res.f_attr, sattr,
3181                     ctx, label);
3182             if (status == 0) {
3183                 nfs_setattr_update_inode(state->inode, sattr,
3184                         opendata->o_res.f_attr);
3185                 nfs_setsecurity(state->inode, opendata->o_res.f_attr);
3186             }
3187             sattr->ia_valid = ia_old;
3188         }
3189     }
3190     if (opened && opendata->file_created)
3191         *opened = 1;
3192 
3193     if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) {
3194         *ctx_th = opendata->f_attr.mdsthreshold;
3195         opendata->f_attr.mdsthreshold = NULL;
3196     }
3197 
3198     nfs4_opendata_put(opendata);
3199     nfs4_put_state_owner(sp);
3200     return 0;
3201 err_opendata_put:
3202     nfs4_opendata_put(opendata);
3203 err_put_state_owner:
3204     nfs4_put_state_owner(sp);
3205 out_err:
3206     return status;
3207 }
3208 
3209 
3210 static struct nfs4_state *nfs4_do_open(struct inode *dir,
3211                     struct nfs_open_context *ctx,
3212                     int flags,
3213                     struct iattr *sattr,
3214                     struct nfs4_label *label,
3215                     int *opened)
3216 {
3217     struct nfs_server *server = NFS_SERVER(dir);
3218     struct nfs4_exception exception = {
3219         .interruptible = true,
3220     };
3221     struct nfs4_state *res;
3222     struct nfs4_open_createattrs c = {
3223         .label = label,
3224         .sattr = sattr,
3225         .verf = {
3226             [0] = (__u32)jiffies,
3227             [1] = (__u32)current->pid,
3228         },
3229     };
3230     int status;
3231 
3232     do {
3233         status = _nfs4_do_open(dir, ctx, flags, &c, opened);
3234         res = ctx->state;
3235         trace_nfs4_open_file(ctx, flags, status);
3236         if (status == 0)
3237             break;
3238         /* NOTE: BAD_SEQID means the server and client disagree about the
3239          * book-keeping w.r.t. state-changing operations
3240          * (OPEN/CLOSE/LOCK/LOCKU...)
3241          * It is actually a sign of a bug on the client or on the server.
3242          *
3243          * If we receive a BAD_SEQID error in the particular case of
3244          * doing an OPEN, we assume that nfs_increment_open_seqid() will
3245          * have unhashed the old state_owner for us, and that we can
3246          * therefore safely retry using a new one. We should still warn
3247          * the user though...
3248          */
3249         if (status == -NFS4ERR_BAD_SEQID) {
3250             pr_warn_ratelimited("NFS: v4 server %s "
3251                     " returned a bad sequence-id error!\n",
3252                     NFS_SERVER(dir)->nfs_client->cl_hostname);
3253             exception.retry = 1;
3254             continue;
3255         }
3256         /*
3257          * BAD_STATEID on OPEN means that the server cancelled our
3258          * state before it received the OPEN_CONFIRM.
3259          * Recover by retrying the request as per the discussion
3260          * on Page 181 of RFC3530.
3261          */
3262         if (status == -NFS4ERR_BAD_STATEID) {
3263             exception.retry = 1;
3264             continue;
3265         }
3266         if (status == -NFS4ERR_EXPIRED) {
3267             nfs4_schedule_lease_recovery(server->nfs_client);
3268             exception.retry = 1;
3269             continue;
3270         }
3271         if (status == -EAGAIN) {
3272             /* We must have found a delegation */
3273             exception.retry = 1;
3274             continue;
3275         }
3276         if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
3277             continue;
3278         res = ERR_PTR(nfs4_handle_exception(server,
3279                     status, &exception));
3280     } while (exception.retry);
3281     return res;
3282 }
3283 
3284 static int _nfs4_do_setattr(struct inode *inode,
3285                 struct nfs_setattrargs *arg,
3286                 struct nfs_setattrres *res,
3287                 const struct cred *cred,
3288                 struct nfs_open_context *ctx)
3289 {
3290     struct nfs_server *server = NFS_SERVER(inode);
3291     struct rpc_message msg = {
3292         .rpc_proc   = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
3293         .rpc_argp   = arg,
3294         .rpc_resp   = res,
3295         .rpc_cred   = cred,
3296     };
3297     const struct cred *delegation_cred = NULL;
3298     unsigned long timestamp = jiffies;
3299     bool truncate;
3300     int status;
3301 
3302     nfs_fattr_init(res->fattr);
3303 
3304     /* Servers should only apply open mode checks for file size changes */
3305     truncate = (arg->iap->ia_valid & ATTR_SIZE) ? true : false;
3306     if (!truncate) {
3307         nfs4_inode_make_writeable(inode);
3308         goto zero_stateid;
3309     }
3310 
3311     if (nfs4_copy_delegation_stateid(inode, FMODE_WRITE, &arg->stateid, &delegation_cred)) {
3312         /* Use that stateid */
3313     } else if (ctx != NULL && ctx->state) {
3314         struct nfs_lock_context *l_ctx;
3315         if (!nfs4_valid_open_stateid(ctx->state))
3316             return -EBADF;
3317         l_ctx = nfs_get_lock_context(ctx);
3318         if (IS_ERR(l_ctx))
3319             return PTR_ERR(l_ctx);
3320         status = nfs4_select_rw_stateid(ctx->state, FMODE_WRITE, l_ctx,
3321                         &arg->stateid, &delegation_cred);
3322         nfs_put_lock_context(l_ctx);
3323         if (status == -EIO)
3324             return -EBADF;
3325         else if (status == -EAGAIN)
3326             goto zero_stateid;
3327     } else {
3328 zero_stateid:
3329         nfs4_stateid_copy(&arg->stateid, &zero_stateid);
3330     }
3331     if (delegation_cred)
3332         msg.rpc_cred = delegation_cred;
3333 
3334     status = nfs4_call_sync(server->client, server, &msg, &arg->seq_args, &res->seq_res, 1);
3335 
3336     put_cred(delegation_cred);
3337     if (status == 0 && ctx != NULL)
3338         renew_lease(server, timestamp);
3339     trace_nfs4_setattr(inode, &arg->stateid, status);
3340     return status;
3341 }
3342 
3343 static int nfs4_do_setattr(struct inode *inode, const struct cred *cred,
3344                struct nfs_fattr *fattr, struct iattr *sattr,
3345                struct nfs_open_context *ctx, struct nfs4_label *ilabel)
3346 {
3347     struct nfs_server *server = NFS_SERVER(inode);
3348     __u32 bitmask[NFS4_BITMASK_SZ];
3349     struct nfs4_state *state = ctx ? ctx->state : NULL;
3350     struct nfs_setattrargs  arg = {
3351         .fh     = NFS_FH(inode),
3352         .iap        = sattr,
3353         .server     = server,
3354         .bitmask = bitmask,
3355         .label      = ilabel,
3356     };
3357     struct nfs_setattrres  res = {
3358         .fattr      = fattr,
3359         .server     = server,
3360     };
3361     struct nfs4_exception exception = {
3362         .state = state,
3363         .inode = inode,
3364         .stateid = &arg.stateid,
3365     };
3366     unsigned long adjust_flags = NFS_INO_INVALID_CHANGE;
3367     int err;
3368 
3369     if (sattr->ia_valid & (ATTR_MODE | ATTR_KILL_SUID | ATTR_KILL_SGID))
3370         adjust_flags |= NFS_INO_INVALID_MODE;
3371     if (sattr->ia_valid & (ATTR_UID | ATTR_GID))
3372         adjust_flags |= NFS_INO_INVALID_OTHER;
3373 
3374     do {
3375         nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, fattr->label),
3376                     inode, adjust_flags);
3377 
3378         err = _nfs4_do_setattr(inode, &arg, &res, cred, ctx);
3379         switch (err) {
3380         case -NFS4ERR_OPENMODE:
3381             if (!(sattr->ia_valid & ATTR_SIZE)) {
3382                 pr_warn_once("NFSv4: server %s is incorrectly "
3383                         "applying open mode checks to "
3384                         "a SETATTR that is not "
3385                         "changing file size.\n",
3386                         server->nfs_client->cl_hostname);
3387             }
3388             if (state && !(state->state & FMODE_WRITE)) {
3389                 err = -EBADF;
3390                 if (sattr->ia_valid & ATTR_OPEN)
3391                     err = -EACCES;
3392                 goto out;
3393             }
3394         }
3395         err = nfs4_handle_exception(server, err, &exception);
3396     } while (exception.retry);
3397 out:
3398     return err;
3399 }
3400 
3401 static bool
3402 nfs4_wait_on_layoutreturn(struct inode *inode, struct rpc_task *task)
3403 {
3404     if (inode == NULL || !nfs_have_layout(inode))
3405         return false;
3406 
3407     return pnfs_wait_on_layoutreturn(inode, task);
3408 }
3409 
3410 /*
3411  * Update the seqid of an open stateid
3412  */
3413 static void nfs4_sync_open_stateid(nfs4_stateid *dst,
3414         struct nfs4_state *state)
3415 {
3416     __be32 seqid_open;
3417     u32 dst_seqid;
3418     int seq;
3419 
3420     for (;;) {
3421         if (!nfs4_valid_open_stateid(state))
3422             break;
3423         seq = read_seqbegin(&state->seqlock);
3424         if (!nfs4_state_match_open_stateid_other(state, dst)) {
3425             nfs4_stateid_copy(dst, &state->open_stateid);
3426             if (read_seqretry(&state->seqlock, seq))
3427                 continue;
3428             break;
3429         }
3430         seqid_open = state->open_stateid.seqid;
3431         if (read_seqretry(&state->seqlock, seq))
3432             continue;
3433 
3434         dst_seqid = be32_to_cpu(dst->seqid);
3435         if ((s32)(dst_seqid - be32_to_cpu(seqid_open)) < 0)
3436             dst->seqid = seqid_open;
3437         break;
3438     }
3439 }
3440 
3441 /*
3442  * Update the seqid of an open stateid after receiving
3443  * NFS4ERR_OLD_STATEID
3444  */
3445 static bool nfs4_refresh_open_old_stateid(nfs4_stateid *dst,
3446         struct nfs4_state *state)
3447 {
3448     __be32 seqid_open;
3449     u32 dst_seqid;
3450     bool ret;
3451     int seq, status = -EAGAIN;
3452     DEFINE_WAIT(wait);
3453 
3454     for (;;) {
3455         ret = false;
3456         if (!nfs4_valid_open_stateid(state))
3457             break;
3458         seq = read_seqbegin(&state->seqlock);
3459         if (!nfs4_state_match_open_stateid_other(state, dst)) {
3460             if (read_seqretry(&state->seqlock, seq))
3461                 continue;
3462             break;
3463         }
3464 
3465         write_seqlock(&state->seqlock);
3466         seqid_open = state->open_stateid.seqid;
3467 
3468         dst_seqid = be32_to_cpu(dst->seqid);
3469 
3470         /* Did another OPEN bump the state's seqid?  try again: */
3471         if ((s32)(be32_to_cpu(seqid_open) - dst_seqid) > 0) {
3472             dst->seqid = seqid_open;
3473             write_sequnlock(&state->seqlock);
3474             ret = true;
3475             break;
3476         }
3477 
3478         /* server says we're behind but we haven't seen the update yet */
3479         set_bit(NFS_STATE_CHANGE_WAIT, &state->flags);
3480         prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE);
3481         write_sequnlock(&state->seqlock);
3482         trace_nfs4_close_stateid_update_wait(state->inode, dst, 0);
3483 
3484         if (fatal_signal_pending(current))
3485             status = -EINTR;
3486         else
3487             if (schedule_timeout(5*HZ) != 0)
3488                 status = 0;
3489 
3490         finish_wait(&state->waitq, &wait);
3491 
3492         if (!status)
3493             continue;
3494         if (status == -EINTR)
3495             break;
3496 
3497         /* we slept the whole 5 seconds, we must have lost a seqid */
3498         dst->seqid = cpu_to_be32(dst_seqid + 1);
3499         ret = true;
3500         break;
3501     }
3502 
3503     return ret;
3504 }
3505 
3506 struct nfs4_closedata {
3507     struct inode *inode;
3508     struct nfs4_state *state;
3509     struct nfs_closeargs arg;
3510     struct nfs_closeres res;
3511     struct {
3512         struct nfs4_layoutreturn_args arg;
3513         struct nfs4_layoutreturn_res res;
3514         struct nfs4_xdr_opaque_data ld_private;
3515         u32 roc_barrier;
3516         bool roc;
3517     } lr;
3518     struct nfs_fattr fattr;
3519     unsigned long timestamp;
3520 };
3521 
3522 static void nfs4_free_closedata(void *data)
3523 {
3524     struct nfs4_closedata *calldata = data;
3525     struct nfs4_state_owner *sp = calldata->state->owner;
3526     struct super_block *sb = calldata->state->inode->i_sb;
3527 
3528     if (calldata->lr.roc)
3529         pnfs_roc_release(&calldata->lr.arg, &calldata->lr.res,
3530                 calldata->res.lr_ret);
3531     nfs4_put_open_state(calldata->state);
3532     nfs_free_seqid(calldata->arg.seqid);
3533     nfs4_put_state_owner(sp);
3534     nfs_sb_deactive(sb);
3535     kfree(calldata);
3536 }
3537 
3538 static void nfs4_close_done(struct rpc_task *task, void *data)
3539 {
3540     struct nfs4_closedata *calldata = data;
3541     struct nfs4_state *state = calldata->state;
3542     struct nfs_server *server = NFS_SERVER(calldata->inode);
3543     nfs4_stateid *res_stateid = NULL;
3544     struct nfs4_exception exception = {
3545         .state = state,
3546         .inode = calldata->inode,
3547         .stateid = &calldata->arg.stateid,
3548     };
3549 
3550     if (!nfs4_sequence_done(task, &calldata->res.seq_res))
3551         return;
3552     trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
3553 
3554     /* Handle Layoutreturn errors */
3555     if (pnfs_roc_done(task, &calldata->arg.lr_args, &calldata->res.lr_res,
3556               &calldata->res.lr_ret) == -EAGAIN)
3557         goto out_restart;
3558 
3559     /* hmm. we are done with the inode, and in the process of freeing
3560      * the state_owner. we keep this around to process errors
3561      */
3562     switch (task->tk_status) {
3563         case 0:
3564             res_stateid = &calldata->res.stateid;
3565             renew_lease(server, calldata->timestamp);
3566             break;
3567         case -NFS4ERR_ACCESS:
3568             if (calldata->arg.bitmask != NULL) {
3569                 calldata->arg.bitmask = NULL;
3570                 calldata->res.fattr = NULL;
3571                 goto out_restart;
3572 
3573             }
3574             break;
3575         case -NFS4ERR_OLD_STATEID:
3576             /* Did we race with OPEN? */
3577             if (nfs4_refresh_open_old_stateid(&calldata->arg.stateid,
3578                         state))
3579                 goto out_restart;
3580             goto out_release;
3581         case -NFS4ERR_ADMIN_REVOKED:
3582         case -NFS4ERR_STALE_STATEID:
3583         case -NFS4ERR_EXPIRED:
3584             nfs4_free_revoked_stateid(server,
3585                     &calldata->arg.stateid,
3586                     task->tk_msg.rpc_cred);
3587             fallthrough;
3588         case -NFS4ERR_BAD_STATEID:
3589             if (calldata->arg.fmode == 0)
3590                 break;
3591             fallthrough;
3592         default:
3593             task->tk_status = nfs4_async_handle_exception(task,
3594                     server, task->tk_status, &exception);
3595             if (exception.retry)
3596                 goto out_restart;
3597     }
3598     nfs_clear_open_stateid(state, &calldata->arg.stateid,
3599             res_stateid, calldata->arg.fmode);
3600 out_release:
3601     task->tk_status = 0;
3602     nfs_release_seqid(calldata->arg.seqid);
3603     nfs_refresh_inode(calldata->inode, &calldata->fattr);
3604     dprintk("%s: ret = %d\n", __func__, task->tk_status);
3605     return;
3606 out_restart:
3607     task->tk_status = 0;
3608     rpc_restart_call_prepare(task);
3609     goto out_release;
3610 }
3611 
3612 static void nfs4_close_prepare(struct rpc_task *task, void *data)
3613 {
3614     struct nfs4_closedata *calldata = data;
3615     struct nfs4_state *state = calldata->state;
3616     struct inode *inode = calldata->inode;
3617     struct nfs_server *server = NFS_SERVER(inode);
3618     struct pnfs_layout_hdr *lo;
3619     bool is_rdonly, is_wronly, is_rdwr;
3620     int call_close = 0;
3621 
3622     if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3623         goto out_wait;
3624 
3625     task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
3626     spin_lock(&state->owner->so_lock);
3627     is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags);
3628     is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags);
3629     is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags);
3630     /* Calculate the change in open mode */
3631     calldata->arg.fmode = 0;
3632     if (state->n_rdwr == 0) {
3633         if (state->n_rdonly == 0)
3634             call_close |= is_rdonly;
3635         else if (is_rdonly)
3636             calldata->arg.fmode |= FMODE_READ;
3637         if (state->n_wronly == 0)
3638             call_close |= is_wronly;
3639         else if (is_wronly)
3640             calldata->arg.fmode |= FMODE_WRITE;
3641         if (calldata->arg.fmode != (FMODE_READ|FMODE_WRITE))
3642             call_close |= is_rdwr;
3643     } else if (is_rdwr)
3644         calldata->arg.fmode |= FMODE_READ|FMODE_WRITE;
3645 
3646     nfs4_sync_open_stateid(&calldata->arg.stateid, state);
3647     if (!nfs4_valid_open_stateid(state))
3648         call_close = 0;
3649     spin_unlock(&state->owner->so_lock);
3650 
3651     if (!call_close) {
3652         /* Note: exit _without_ calling nfs4_close_done */
3653         goto out_no_action;
3654     }
3655 
3656     if (!calldata->lr.roc && nfs4_wait_on_layoutreturn(inode, task)) {
3657         nfs_release_seqid(calldata->arg.seqid);
3658         goto out_wait;
3659     }
3660 
3661     lo = calldata->arg.lr_args ? calldata->arg.lr_args->layout : NULL;
3662     if (lo && !pnfs_layout_is_valid(lo)) {
3663         calldata->arg.lr_args = NULL;
3664         calldata->res.lr_res = NULL;
3665     }
3666 
3667     if (calldata->arg.fmode == 0)
3668         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
3669 
3670     if (calldata->arg.fmode == 0 || calldata->arg.fmode == FMODE_READ) {
3671         /* Close-to-open cache consistency revalidation */
3672         if (!nfs4_have_delegation(inode, FMODE_READ)) {
3673             nfs4_bitmask_set(calldata->arg.bitmask_store,
3674                      server->cache_consistency_bitmask,
3675                      inode, 0);
3676             calldata->arg.bitmask = calldata->arg.bitmask_store;
3677         } else
3678             calldata->arg.bitmask = NULL;
3679     }
3680 
3681     calldata->arg.share_access =
3682         nfs4_map_atomic_open_share(NFS_SERVER(inode),
3683                 calldata->arg.fmode, 0);
3684 
3685     if (calldata->res.fattr == NULL)
3686         calldata->arg.bitmask = NULL;
3687     else if (calldata->arg.bitmask == NULL)
3688         calldata->res.fattr = NULL;
3689     calldata->timestamp = jiffies;
3690     if (nfs4_setup_sequence(NFS_SERVER(inode)->nfs_client,
3691                 &calldata->arg.seq_args,
3692                 &calldata->res.seq_res,
3693                 task) != 0)
3694         nfs_release_seqid(calldata->arg.seqid);
3695     return;
3696 out_no_action:
3697     task->tk_action = NULL;
3698 out_wait:
3699     nfs4_sequence_done(task, &calldata->res.seq_res);
3700 }
3701 
3702 static const struct rpc_call_ops nfs4_close_ops = {
3703     .rpc_call_prepare = nfs4_close_prepare,
3704     .rpc_call_done = nfs4_close_done,
3705     .rpc_release = nfs4_free_closedata,
3706 };
3707 
3708 /* 
3709  * It is possible for data to be read/written from a mem-mapped file 
3710  * after the sys_close call (which hits the vfs layer as a flush).
3711  * This means that we can't safely call nfsv4 close on a file until 
3712  * the inode is cleared. This in turn means that we are not good
3713  * NFSv4 citizens - we do not indicate to the server to update the file's 
3714  * share state even when we are done with one of the three share 
3715  * stateid's in the inode.
3716  *
3717  * NOTE: Caller must be holding the sp->so_owner semaphore!
3718  */
3719 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
3720 {
3721     struct nfs_server *server = NFS_SERVER(state->inode);
3722     struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
3723     struct nfs4_closedata *calldata;
3724     struct nfs4_state_owner *sp = state->owner;
3725     struct rpc_task *task;
3726     struct rpc_message msg = {
3727         .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
3728         .rpc_cred = state->owner->so_cred,
3729     };
3730     struct rpc_task_setup task_setup_data = {
3731         .rpc_client = server->client,
3732         .rpc_message = &msg,
3733         .callback_ops = &nfs4_close_ops,
3734         .workqueue = nfsiod_workqueue,
3735         .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
3736     };
3737     int status = -ENOMEM;
3738 
3739     if (nfs_server_capable(state->inode, NFS_CAP_MOVEABLE))
3740         task_setup_data.flags |= RPC_TASK_MOVEABLE;
3741 
3742     nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP,
3743         &task_setup_data.rpc_client, &msg);
3744 
3745     calldata = kzalloc(sizeof(*calldata), gfp_mask);
3746     if (calldata == NULL)
3747         goto out;
3748     nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1, 0);
3749     calldata->inode = state->inode;
3750     calldata->state = state;
3751     calldata->arg.fh = NFS_FH(state->inode);
3752     if (!nfs4_copy_open_stateid(&calldata->arg.stateid, state))
3753         goto out_free_calldata;
3754     /* Serialization for the sequence id */
3755     alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
3756     calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask);
3757     if (IS_ERR(calldata->arg.seqid))
3758         goto out_free_calldata;
3759     nfs_fattr_init(&calldata->fattr);
3760     calldata->arg.fmode = 0;
3761     calldata->lr.arg.ld_private = &calldata->lr.ld_private;
3762     calldata->res.fattr = &calldata->fattr;
3763     calldata->res.seqid = calldata->arg.seqid;
3764     calldata->res.server = server;
3765     calldata->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT;
3766     calldata->lr.roc = pnfs_roc(state->inode,
3767             &calldata->lr.arg, &calldata->lr.res, msg.rpc_cred);
3768     if (calldata->lr.roc) {
3769         calldata->arg.lr_args = &calldata->lr.arg;
3770         calldata->res.lr_res = &calldata->lr.res;
3771     }
3772     nfs_sb_active(calldata->inode->i_sb);
3773 
3774     msg.rpc_argp = &calldata->arg;
3775     msg.rpc_resp = &calldata->res;
3776     task_setup_data.callback_data = calldata;
3777     task = rpc_run_task(&task_setup_data);
3778     if (IS_ERR(task))
3779         return PTR_ERR(task);
3780     status = 0;
3781     if (wait)
3782         status = rpc_wait_for_completion_task(task);
3783     rpc_put_task(task);
3784     return status;
3785 out_free_calldata:
3786     kfree(calldata);
3787 out:
3788     nfs4_put_open_state(state);
3789     nfs4_put_state_owner(sp);
3790     return status;
3791 }
3792 
3793 static struct inode *
3794 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx,
3795         int open_flags, struct iattr *attr, int *opened)
3796 {
3797     struct nfs4_state *state;
3798     struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL;
3799 
3800     label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
3801 
3802     /* Protect against concurrent sillydeletes */
3803     state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened);
3804 
3805     nfs4_label_release_security(label);
3806 
3807     if (IS_ERR(state))
3808         return ERR_CAST(state);
3809     return state->inode;
3810 }
3811 
3812 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
3813 {
3814     if (ctx->state == NULL)
3815         return;
3816     if (is_sync)
3817         nfs4_close_sync(ctx->state, _nfs4_ctx_to_openmode(ctx));
3818     else
3819         nfs4_close_state(ctx->state, _nfs4_ctx_to_openmode(ctx));
3820 }
3821 
3822 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL)
3823 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL)
3824 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_XATTR_SUPPORT - 1UL)
3825 
3826 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
3827 {
3828     u32 bitmask[3] = {}, minorversion = server->nfs_client->cl_minorversion;
3829     struct nfs4_server_caps_arg args = {
3830         .fhandle = fhandle,
3831         .bitmask = bitmask,
3832     };
3833     struct nfs4_server_caps_res res = {};
3834     struct rpc_message msg = {
3835         .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
3836         .rpc_argp = &args,
3837         .rpc_resp = &res,
3838     };
3839     int status;
3840     int i;
3841 
3842     bitmask[0] = FATTR4_WORD0_SUPPORTED_ATTRS |
3843              FATTR4_WORD0_FH_EXPIRE_TYPE |
3844              FATTR4_WORD0_LINK_SUPPORT |
3845              FATTR4_WORD0_SYMLINK_SUPPORT |
3846              FATTR4_WORD0_ACLSUPPORT |
3847              FATTR4_WORD0_CASE_INSENSITIVE |
3848              FATTR4_WORD0_CASE_PRESERVING;
3849     if (minorversion)
3850         bitmask[2] = FATTR4_WORD2_SUPPATTR_EXCLCREAT;
3851 
3852     status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3853     if (status == 0) {
3854         /* Sanity check the server answers */
3855         switch (minorversion) {
3856         case 0:
3857             res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK;
3858             res.attr_bitmask[2] = 0;
3859             break;
3860         case 1:
3861             res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK;
3862             break;
3863         case 2:
3864             res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK;
3865         }
3866         memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
3867         server->caps &= ~(NFS_CAP_ACLS | NFS_CAP_HARDLINKS |
3868                   NFS_CAP_SYMLINKS| NFS_CAP_SECURITY_LABEL);
3869         server->fattr_valid = NFS_ATTR_FATTR_V4;
3870         if (res.attr_bitmask[0] & FATTR4_WORD0_ACL &&
3871                 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3872             server->caps |= NFS_CAP_ACLS;
3873         if (res.has_links != 0)
3874             server->caps |= NFS_CAP_HARDLINKS;
3875         if (res.has_symlinks != 0)
3876             server->caps |= NFS_CAP_SYMLINKS;
3877         if (res.case_insensitive)
3878             server->caps |= NFS_CAP_CASE_INSENSITIVE;
3879         if (res.case_preserving)
3880             server->caps |= NFS_CAP_CASE_PRESERVING;
3881 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
3882         if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
3883             server->caps |= NFS_CAP_SECURITY_LABEL;
3884 #endif
3885         if (res.attr_bitmask[0] & FATTR4_WORD0_FS_LOCATIONS)
3886             server->caps |= NFS_CAP_FS_LOCATIONS;
3887         if (!(res.attr_bitmask[0] & FATTR4_WORD0_FILEID))
3888             server->fattr_valid &= ~NFS_ATTR_FATTR_FILEID;
3889         if (!(res.attr_bitmask[1] & FATTR4_WORD1_MODE))
3890             server->fattr_valid &= ~NFS_ATTR_FATTR_MODE;
3891         if (!(res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS))
3892             server->fattr_valid &= ~NFS_ATTR_FATTR_NLINK;
3893         if (!(res.attr_bitmask[1] & FATTR4_WORD1_OWNER))
3894             server->fattr_valid &= ~(NFS_ATTR_FATTR_OWNER |
3895                 NFS_ATTR_FATTR_OWNER_NAME);
3896         if (!(res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP))
3897             server->fattr_valid &= ~(NFS_ATTR_FATTR_GROUP |
3898                 NFS_ATTR_FATTR_GROUP_NAME);
3899         if (!(res.attr_bitmask[1] & FATTR4_WORD1_SPACE_USED))
3900             server->fattr_valid &= ~NFS_ATTR_FATTR_SPACE_USED;
3901         if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS))
3902             server->fattr_valid &= ~NFS_ATTR_FATTR_ATIME;
3903         if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA))
3904             server->fattr_valid &= ~NFS_ATTR_FATTR_CTIME;
3905         if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY))
3906             server->fattr_valid &= ~NFS_ATTR_FATTR_MTIME;
3907         memcpy(server->attr_bitmask_nl, res.attr_bitmask,
3908                 sizeof(server->attr_bitmask));
3909         server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
3910 
3911         memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
3912         server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
3913         server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
3914         server->cache_consistency_bitmask[2] = 0;
3915 
3916         /* Avoid a regression due to buggy server */
3917         for (i = 0; i < ARRAY_SIZE(res.exclcreat_bitmask); i++)
3918             res.exclcreat_bitmask[i] &= res.attr_bitmask[i];
3919         memcpy(server->exclcreat_bitmask, res.exclcreat_bitmask,
3920             sizeof(server->exclcreat_bitmask));
3921 
3922         server->acl_bitmask = res.acl_bitmask;
3923         server->fh_expire_type = res.fh_expire_type;
3924     }
3925 
3926     return status;
3927 }
3928 
3929 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
3930 {
3931     struct nfs4_exception exception = {
3932         .interruptible = true,
3933     };
3934     int err;
3935 
3936     nfs4_server_set_init_caps(server);
3937     do {
3938         err = nfs4_handle_exception(server,
3939                 _nfs4_server_capabilities(server, fhandle),
3940                 &exception);
3941     } while (exception.retry);
3942     return err;
3943 }
3944 
3945 static void test_fs_location_for_trunking(struct nfs4_fs_location *location,
3946                       struct nfs_client *clp,
3947                       struct nfs_server *server)
3948 {
3949     int i;
3950 
3951     for (i = 0; i < location->nservers; i++) {
3952         struct nfs4_string *srv_loc = &location->servers[i];
3953         struct sockaddr addr;
3954         size_t addrlen;
3955         struct xprt_create xprt_args = {
3956             .ident = 0,
3957             .net = clp->cl_net,
3958         };
3959         struct nfs4_add_xprt_data xprtdata = {
3960             .clp = clp,
3961         };
3962         struct rpc_add_xprt_test rpcdata = {
3963             .add_xprt_test = clp->cl_mvops->session_trunk,
3964             .data = &xprtdata,
3965         };
3966         char *servername = NULL;
3967 
3968         if (!srv_loc->len)
3969             continue;
3970 
3971         addrlen = nfs_parse_server_name(srv_loc->data, srv_loc->len,
3972                         &addr, sizeof(addr),
3973                         clp->cl_net, server->port);
3974         if (!addrlen)
3975             return;
3976         xprt_args.dstaddr = &addr;
3977         xprt_args.addrlen = addrlen;
3978         servername = kmalloc(srv_loc->len + 1, GFP_KERNEL);
3979         if (!servername)
3980             return;
3981         memcpy(servername, srv_loc->data, srv_loc->len);
3982         servername[srv_loc->len] = '\0';
3983         xprt_args.servername = servername;
3984 
3985         xprtdata.cred = nfs4_get_clid_cred(clp);
3986         rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args,
3987                   rpc_clnt_setup_test_and_add_xprt,
3988                   &rpcdata);
3989         if (xprtdata.cred)
3990             put_cred(xprtdata.cred);
3991         kfree(servername);
3992     }
3993 }
3994 
3995 static int _nfs4_discover_trunking(struct nfs_server *server,
3996                    struct nfs_fh *fhandle)
3997 {
3998     struct nfs4_fs_locations *locations = NULL;
3999     struct page *page;
4000     const struct cred *cred;
4001     struct nfs_client *clp = server->nfs_client;
4002     const struct nfs4_state_maintenance_ops *ops =
4003         clp->cl_mvops->state_renewal_ops;
4004     int status = -ENOMEM, i;
4005 
4006     cred = ops->get_state_renewal_cred(clp);
4007     if (cred == NULL) {
4008         cred = nfs4_get_clid_cred(clp);
4009         if (cred == NULL)
4010             return -ENOKEY;
4011     }
4012 
4013     page = alloc_page(GFP_KERNEL);
4014     if (!page)
4015         return -ENOMEM;
4016     locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
4017     if (!locations)
4018         goto out_free;
4019     locations->fattr = nfs_alloc_fattr();
4020     if (!locations->fattr)
4021         goto out_free_2;
4022 
4023     status = nfs4_proc_get_locations(server, fhandle, locations, page,
4024                      cred);
4025     if (status)
4026         goto out_free_3;
4027 
4028     for (i = 0; i < locations->nlocations; i++)
4029         test_fs_location_for_trunking(&locations->locations[i], clp,
4030                           server);
4031 out_free_3:
4032     kfree(locations->fattr);
4033 out_free_2:
4034     kfree(locations);
4035 out_free:
4036     __free_page(page);
4037     return status;
4038 }
4039 
4040 static int nfs4_discover_trunking(struct nfs_server *server,
4041                   struct nfs_fh *fhandle)
4042 {
4043     struct nfs4_exception exception = {
4044         .interruptible = true,
4045     };
4046     struct nfs_client *clp = server->nfs_client;
4047     int err = 0;
4048 
4049     if (!nfs4_has_session(clp))
4050         goto out;
4051     do {
4052         err = nfs4_handle_exception(server,
4053                 _nfs4_discover_trunking(server, fhandle),
4054                 &exception);
4055     } while (exception.retry);
4056 out:
4057     return err;
4058 }
4059 
4060 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
4061         struct nfs_fsinfo *info)
4062 {
4063     u32 bitmask[3];
4064     struct nfs4_lookup_root_arg args = {
4065         .bitmask = bitmask,
4066     };
4067     struct nfs4_lookup_res res = {
4068         .server = server,
4069         .fattr = info->fattr,
4070         .fh = fhandle,
4071     };
4072     struct rpc_message msg = {
4073         .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
4074         .rpc_argp = &args,
4075         .rpc_resp = &res,
4076     };
4077 
4078     bitmask[0] = nfs4_fattr_bitmap[0];
4079     bitmask[1] = nfs4_fattr_bitmap[1];
4080     /*
4081      * Process the label in the upcoming getfattr
4082      */
4083     bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
4084 
4085     nfs_fattr_init(info->fattr);
4086     return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4087 }
4088 
4089 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
4090         struct nfs_fsinfo *info)
4091 {
4092     struct nfs4_exception exception = {
4093         .interruptible = true,
4094     };
4095     int err;
4096     do {
4097         err = _nfs4_lookup_root(server, fhandle, info);
4098         trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
4099         switch (err) {
4100         case 0:
4101         case -NFS4ERR_WRONGSEC:
4102             goto out;
4103         default:
4104             err = nfs4_handle_exception(server, err, &exception);
4105         }
4106     } while (exception.retry);
4107 out:
4108     return err;
4109 }
4110 
4111 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
4112                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
4113 {
4114     struct rpc_auth_create_args auth_args = {
4115         .pseudoflavor = flavor,
4116     };
4117     struct rpc_auth *auth;
4118 
4119     auth = rpcauth_create(&auth_args, server->client);
4120     if (IS_ERR(auth))
4121         return -EACCES;
4122     return nfs4_lookup_root(server, fhandle, info);
4123 }
4124 
4125 /*
4126  * Retry pseudoroot lookup with various security flavors.  We do this when:
4127  *
4128  *   NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
4129  *   NFSv4.1: the server does not support the SECINFO_NO_NAME operation
4130  *
4131  * Returns zero on success, or a negative NFS4ERR value, or a
4132  * negative errno value.
4133  */
4134 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
4135                   struct nfs_fsinfo *info)
4136 {
4137     /* Per 3530bis 15.33.5 */
4138     static const rpc_authflavor_t flav_array[] = {
4139         RPC_AUTH_GSS_KRB5P,
4140         RPC_AUTH_GSS_KRB5I,
4141         RPC_AUTH_GSS_KRB5,
4142         RPC_AUTH_UNIX,          /* courtesy */
4143         RPC_AUTH_NULL,
4144     };
4145     int status = -EPERM;
4146     size_t i;
4147 
4148     if (server->auth_info.flavor_len > 0) {
4149         /* try each flavor specified by user */
4150         for (i = 0; i < server->auth_info.flavor_len; i++) {
4151             status = nfs4_lookup_root_sec(server, fhandle, info,
4152                         server->auth_info.flavors[i]);
4153             if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
4154                 continue;
4155             break;
4156         }
4157     } else {
4158         /* no flavors specified by user, try default list */
4159         for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
4160             status = nfs4_lookup_root_sec(server, fhandle, info,
4161                               flav_array[i]);
4162             if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
4163                 continue;
4164             break;
4165         }
4166     }
4167 
4168     /*
4169      * -EACCES could mean that the user doesn't have correct permissions
4170      * to access the mount.  It could also mean that we tried to mount
4171      * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
4172      * existing mount programs don't handle -EACCES very well so it should
4173      * be mapped to -EPERM instead.
4174      */
4175     if (status == -EACCES)
4176         status = -EPERM;
4177     return status;
4178 }
4179 
4180 /**
4181  * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
4182  * @server: initialized nfs_server handle
4183  * @fhandle: we fill in the pseudo-fs root file handle
4184  * @info: we fill in an FSINFO struct
4185  * @auth_probe: probe the auth flavours
4186  *
4187  * Returns zero on success, or a negative errno.
4188  */
4189 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
4190              struct nfs_fsinfo *info,
4191              bool auth_probe)
4192 {
4193     int status = 0;
4194 
4195     if (!auth_probe)
4196         status = nfs4_lookup_root(server, fhandle, info);
4197 
4198     if (auth_probe || status == NFS4ERR_WRONGSEC)
4199         status = server->nfs_client->cl_mvops->find_root_sec(server,
4200                 fhandle, info);
4201 
4202     if (status == 0)
4203         status = nfs4_server_capabilities(server, fhandle);
4204     if (status == 0)
4205         status = nfs4_do_fsinfo(server, fhandle, info);
4206 
4207     return nfs4_map_errors(status);
4208 }
4209 
4210 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
4211                   struct nfs_fsinfo *info)
4212 {
4213     int error;
4214     struct nfs_fattr *fattr = info->fattr;
4215 
4216     error = nfs4_server_capabilities(server, mntfh);
4217     if (error < 0) {
4218         dprintk("nfs4_get_root: getcaps error = %d\n", -error);
4219         return error;
4220     }
4221 
4222     error = nfs4_proc_getattr(server, mntfh, fattr, NULL);
4223     if (error < 0) {
4224         dprintk("nfs4_get_root: getattr error = %d\n", -error);
4225         goto out;
4226     }
4227 
4228     if (fattr->valid & NFS_ATTR_FATTR_FSID &&
4229         !nfs_fsid_equal(&server->fsid, &fattr->fsid))
4230         memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
4231 
4232 out:
4233     return error;
4234 }
4235 
4236 /*
4237  * Get locations and (maybe) other attributes of a referral.
4238  * Note that we'll actually follow the referral later when
4239  * we detect fsid mismatch in inode revalidation
4240  */
4241 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
4242                  const struct qstr *name, struct nfs_fattr *fattr,
4243                  struct nfs_fh *fhandle)
4244 {
4245     int status = -ENOMEM;
4246     struct page *page = NULL;
4247     struct nfs4_fs_locations *locations = NULL;
4248 
4249     page = alloc_page(GFP_KERNEL);
4250     if (page == NULL)
4251         goto out;
4252     locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
4253     if (locations == NULL)
4254         goto out;
4255 
4256     locations->fattr = fattr;
4257 
4258     status = nfs4_proc_fs_locations(client, dir, name, locations, page);
4259     if (status != 0)
4260         goto out;
4261 
4262     /*
4263      * If the fsid didn't change, this is a migration event, not a
4264      * referral.  Cause us to drop into the exception handler, which
4265      * will kick off migration recovery.
4266      */
4267     if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &fattr->fsid)) {
4268         dprintk("%s: server did not return a different fsid for"
4269             " a referral at %s\n", __func__, name->name);
4270         status = -NFS4ERR_MOVED;
4271         goto out;
4272     }
4273     /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
4274     nfs_fixup_referral_attributes(fattr);
4275     memset(fhandle, 0, sizeof(struct nfs_fh));
4276 out:
4277     if (page)
4278         __free_page(page);
4279     kfree(locations);
4280     return status;
4281 }
4282 
4283 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
4284                 struct nfs_fattr *fattr, struct inode *inode)
4285 {
4286     __u32 bitmask[NFS4_BITMASK_SZ];
4287     struct nfs4_getattr_arg args = {
4288         .fh = fhandle,
4289         .bitmask = bitmask,
4290     };
4291     struct nfs4_getattr_res res = {
4292         .fattr = fattr,
4293         .server = server,
4294     };
4295     struct rpc_message msg = {
4296         .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
4297         .rpc_argp = &args,
4298         .rpc_resp = &res,
4299     };
4300     unsigned short task_flags = 0;
4301 
4302     if (nfs4_has_session(server->nfs_client))
4303         task_flags = RPC_TASK_MOVEABLE;
4304 
4305     /* Is this is an attribute revalidation, subject to softreval? */
4306     if (inode && (server->flags & NFS_MOUNT_SOFTREVAL))
4307         task_flags |= RPC_TASK_TIMEOUT;
4308 
4309     nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, fattr->label), inode, 0);
4310     nfs_fattr_init(fattr);
4311     nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
4312     return nfs4_do_call_sync(server->client, server, &msg,
4313             &args.seq_args, &res.seq_res, task_flags);
4314 }
4315 
4316 int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
4317                 struct nfs_fattr *fattr, struct inode *inode)
4318 {
4319     struct nfs4_exception exception = {
4320         .interruptible = true,
4321     };
4322     int err;
4323     do {
4324         err = _nfs4_proc_getattr(server, fhandle, fattr, inode);
4325         trace_nfs4_getattr(server, fhandle, fattr, err);
4326         err = nfs4_handle_exception(server, err,
4327                 &exception);
4328     } while (exception.retry);
4329     return err;
4330 }
4331 
4332 /* 
4333  * The file is not closed if it is opened due to the a request to change
4334  * the size of the file. The open call will not be needed once the
4335  * VFS layer lookup-intents are implemented.
4336  *
4337  * Close is called when the inode is destroyed.
4338  * If we haven't opened the file for O_WRONLY, we
4339  * need to in the size_change case to obtain a stateid.
4340  *
4341  * Got race?
4342  * Because OPEN is always done by name in nfsv4, it is
4343  * possible that we opened a different file by the same
4344  * name.  We can recognize this race condition, but we
4345  * can't do anything about it besides returning an error.
4346  *
4347  * This will be fixed with VFS changes (lookup-intent).
4348  */
4349 static int
4350 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
4351           struct iattr *sattr)
4352 {
4353     struct inode *inode = d_inode(dentry);
4354     const struct cred *cred = NULL;
4355     struct nfs_open_context *ctx = NULL;
4356     int status;
4357 
4358     if (pnfs_ld_layoutret_on_setattr(inode) &&
4359         sattr->ia_valid & ATTR_SIZE &&
4360         sattr->ia_size < i_size_read(inode))
4361         pnfs_commit_and_return_layout(inode);
4362 
4363     nfs_fattr_init(fattr);
4364     
4365     /* Deal with open(O_TRUNC) */
4366     if (sattr->ia_valid & ATTR_OPEN)
4367         sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
4368 
4369     /* Optimization: if the end result is no change, don't RPC */
4370     if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
4371         return 0;
4372 
4373     /* Search for an existing open(O_WRITE) file */
4374     if (sattr->ia_valid & ATTR_FILE) {
4375 
4376         ctx = nfs_file_open_context(sattr->ia_file);
4377         if (ctx)
4378             cred = ctx->cred;
4379     }
4380 
4381     /* Return any delegations if we're going to change ACLs */
4382     if ((sattr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
4383         nfs4_inode_make_writeable(inode);
4384 
4385     status = nfs4_do_setattr(inode, cred, fattr, sattr, ctx, NULL);
4386     if (status == 0) {
4387         nfs_setattr_update_inode(inode, sattr, fattr);
4388         nfs_setsecurity(inode, fattr);
4389     }
4390     return status;
4391 }
4392 
4393 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
4394         struct dentry *dentry, struct nfs_fh *fhandle,
4395         struct nfs_fattr *fattr)
4396 {
4397     struct nfs_server *server = NFS_SERVER(dir);
4398     int            status;
4399     struct nfs4_lookup_arg args = {
4400         .bitmask = server->attr_bitmask,
4401         .dir_fh = NFS_FH(dir),
4402         .name = &dentry->d_name,
4403     };
4404     struct nfs4_lookup_res res = {
4405         .server = server,
4406         .fattr = fattr,
4407         .fh = fhandle,
4408     };
4409     struct rpc_message msg = {
4410         .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
4411         .rpc_argp = &args,
4412         .rpc_resp = &res,
4413     };
4414     unsigned short task_flags = 0;
4415 
4416     if (nfs_server_capable(dir, NFS_CAP_MOVEABLE))
4417         task_flags = RPC_TASK_MOVEABLE;
4418 
4419     /* Is this is an attribute revalidation, subject to softreval? */
4420     if (nfs_lookup_is_soft_revalidate(dentry))
4421         task_flags |= RPC_TASK_TIMEOUT;
4422 
4423     args.bitmask = nfs4_bitmask(server, fattr->label);
4424 
4425     nfs_fattr_init(fattr);
4426 
4427     dprintk("NFS call  lookup %pd2\n", dentry);
4428     nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
4429     status = nfs4_do_call_sync(clnt, server, &msg,
4430             &args.seq_args, &res.seq_res, task_flags);
4431     dprintk("NFS reply lookup: %d\n", status);
4432     return status;
4433 }
4434 
4435 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
4436 {
4437     fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4438         NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
4439     fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4440     fattr->nlink = 2;
4441 }
4442 
4443 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
4444                    struct dentry *dentry, struct nfs_fh *fhandle,
4445                    struct nfs_fattr *fattr)
4446 {
4447     struct nfs4_exception exception = {
4448         .interruptible = true,
4449     };
4450     struct rpc_clnt *client = *clnt;
4451     const struct qstr *name = &dentry->d_name;
4452     int err;
4453     do {
4454         err = _nfs4_proc_lookup(client, dir, dentry, fhandle, fattr);
4455         trace_nfs4_lookup(dir, name, err);
4456         switch (err) {
4457         case -NFS4ERR_BADNAME:
4458             err = -ENOENT;
4459             goto out;
4460         case -NFS4ERR_MOVED:
4461             err = nfs4_get_referral(client, dir, name, fattr, fhandle);
4462             if (err == -NFS4ERR_MOVED)
4463                 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
4464             goto out;
4465         case -NFS4ERR_WRONGSEC:
4466             err = -EPERM;
4467             if (client != *clnt)
4468                 goto out;
4469             client = nfs4_negotiate_security(client, dir, name);
4470             if (IS_ERR(client))
4471                 return PTR_ERR(client);
4472 
4473             exception.retry = 1;
4474             break;
4475         default:
4476             err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
4477         }
4478     } while (exception.retry);
4479 
4480 out:
4481     if (err == 0)
4482         *clnt = client;
4483     else if (client != *clnt)
4484         rpc_shutdown_client(client);
4485 
4486     return err;
4487 }
4488 
4489 static int nfs4_proc_lookup(struct inode *dir, struct dentry *dentry,
4490                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
4491 {
4492     int status;
4493     struct rpc_clnt *client = NFS_CLIENT(dir);
4494 
4495     status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr);
4496     if (client != NFS_CLIENT(dir)) {
4497         rpc_shutdown_client(client);
4498         nfs_fixup_secinfo_attributes(fattr);
4499     }
4500     return status;
4501 }
4502 
4503 struct rpc_clnt *
4504 nfs4_proc_lookup_mountpoint(struct inode *dir, struct dentry *dentry,
4505                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
4506 {
4507     struct rpc_clnt *client = NFS_CLIENT(dir);
4508     int status;
4509 
4510     status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr);
4511     if (status < 0)
4512         return ERR_PTR(status);
4513     return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
4514 }
4515 
4516 static int _nfs4_proc_lookupp(struct inode *inode,
4517         struct nfs_fh *fhandle, struct nfs_fattr *fattr)
4518 {
4519     struct rpc_clnt *clnt = NFS_CLIENT(inode);
4520     struct nfs_server *server = NFS_SERVER(inode);
4521     int            status;
4522     struct nfs4_lookupp_arg args = {
4523         .bitmask = server->attr_bitmask,
4524         .fh = NFS_FH(inode),
4525     };
4526     struct nfs4_lookupp_res res = {
4527         .server = server,
4528         .fattr = fattr,
4529         .fh = fhandle,
4530     };
4531     struct rpc_message msg = {
4532         .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUPP],
4533         .rpc_argp = &args,
4534         .rpc_resp = &res,
4535     };
4536     unsigned short task_flags = 0;
4537 
4538     if (NFS_SERVER(inode)->flags & NFS_MOUNT_SOFTREVAL)
4539         task_flags |= RPC_TASK_TIMEOUT;
4540 
4541     args.bitmask = nfs4_bitmask(server, fattr->label);
4542 
4543     nfs_fattr_init(fattr);
4544 
4545     dprintk("NFS call  lookupp ino=0x%lx\n", inode->i_ino);
4546     status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
4547                 &res.seq_res, task_flags);
4548     dprintk("NFS reply lookupp: %d\n", status);
4549     return status;
4550 }
4551 
4552 static int nfs4_proc_lookupp(struct inode *inode, struct nfs_fh *fhandle,
4553                  struct nfs_fattr *fattr)
4554 {
4555     struct nfs4_exception exception = {
4556         .interruptible = true,
4557     };
4558     int err;
4559     do {
4560         err = _nfs4_proc_lookupp(inode, fhandle, fattr);
4561         trace_nfs4_lookupp(inode, err);
4562         err = nfs4_handle_exception(NFS_SERVER(inode), err,
4563                 &exception);
4564     } while (exception.retry);
4565     return err;
4566 }
4567 
4568 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry,
4569                  const struct cred *cred)
4570 {
4571     struct nfs_server *server = NFS_SERVER(inode);
4572     struct nfs4_accessargs args = {
4573         .fh = NFS_FH(inode),
4574         .access = entry->mask,
4575     };
4576     struct nfs4_accessres res = {
4577         .server = server,
4578     };
4579     struct rpc_message msg = {
4580         .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
4581         .rpc_argp = &args,
4582         .rpc_resp = &res,
4583         .rpc_cred = cred,
4584     };
4585     int status = 0;
4586 
4587     if (!nfs4_have_delegation(inode, FMODE_READ)) {
4588         res.fattr = nfs_alloc_fattr();
4589         if (res.fattr == NULL)
4590             return -ENOMEM;
4591         args.bitmask = server->cache_consistency_bitmask;
4592     }
4593     status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4594     if (!status) {
4595         nfs_access_set_mask(entry, res.access);
4596         if (res.fattr)
4597             nfs_refresh_inode(inode, res.fattr);
4598     }
4599     nfs_free_fattr(res.fattr);
4600     return status;
4601 }
4602 
4603 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry,
4604                 const struct cred *cred)
4605 {
4606     struct nfs4_exception exception = {
4607         .interruptible = true,
4608     };
4609     int err;
4610     do {
4611         err = _nfs4_proc_access(inode, entry, cred);
4612         trace_nfs4_access(inode, err);
4613         err = nfs4_handle_exception(NFS_SERVER(inode), err,
4614                 &exception);
4615     } while (exception.retry);
4616     return err;
4617 }
4618 
4619 /*
4620  * TODO: For the time being, we don't try to get any attributes
4621  * along with any of the zero-copy operations READ, READDIR,
4622  * READLINK, WRITE.
4623  *
4624  * In the case of the first three, we want to put the GETATTR
4625  * after the read-type operation -- this is because it is hard
4626  * to predict the length of a GETATTR response in v4, and thus
4627  * align the READ data correctly.  This means that the GETATTR
4628  * may end up partially falling into the page cache, and we should
4629  * shift it into the 'tail' of the xdr_buf before processing.
4630  * To do this efficiently, we need to know the total length
4631  * of data received, which doesn't seem to be available outside
4632  * of the RPC layer.
4633  *
4634  * In the case of WRITE, we also want to put the GETATTR after
4635  * the operation -- in this case because we want to make sure
4636  * we get the post-operation mtime and size.
4637  *
4638  * Both of these changes to the XDR layer would in fact be quite
4639  * minor, but I decided to leave them for a subsequent patch.
4640  */
4641 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
4642         unsigned int pgbase, unsigned int pglen)
4643 {
4644     struct nfs4_readlink args = {
4645         .fh       = NFS_FH(inode),
4646         .pgbase   = pgbase,
4647         .pglen    = pglen,
4648         .pages    = &page,
4649     };
4650     struct nfs4_readlink_res res;
4651     struct rpc_message msg = {
4652         .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
4653         .rpc_argp = &args,
4654         .rpc_resp = &res,
4655     };
4656 
4657     return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
4658 }
4659 
4660 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
4661         unsigned int pgbase, unsigned int pglen)
4662 {
4663     struct nfs4_exception exception = {
4664         .interruptible = true,
4665     };
4666     int err;
4667     do {
4668         err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
4669         trace_nfs4_readlink(inode, err);
4670         err = nfs4_handle_exception(NFS_SERVER(inode), err,
4671                 &exception);
4672     } while (exception.retry);
4673     return err;
4674 }
4675 
4676 /*
4677  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
4678  */
4679 static int
4680 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
4681          int flags)
4682 {
4683     struct nfs_server *server = NFS_SERVER(dir);
4684     struct nfs4_label l, *ilabel = NULL;
4685     struct nfs_open_context *ctx;
4686     struct nfs4_state *state;
4687     int status = 0;
4688 
4689     ctx = alloc_nfs_open_context(dentry, FMODE_READ, NULL);
4690     if (IS_ERR(ctx))
4691         return PTR_ERR(ctx);
4692 
4693     ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
4694 
4695     if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
4696         sattr->ia_mode &= ~current_umask();
4697     state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, NULL);
4698     if (IS_ERR(state)) {
4699         status = PTR_ERR(state);
4700         goto out;
4701     }
4702 out:
4703     nfs4_label_release_security(ilabel);
4704     put_nfs_open_context(ctx);
4705     return status;
4706 }
4707 
4708 static int
4709 _nfs4_proc_remove(struct inode *dir, const struct qstr *name, u32 ftype)
4710 {
4711     struct nfs_server *server = NFS_SERVER(dir);
4712     struct nfs_removeargs args = {
4713         .fh = NFS_FH(dir),
4714         .name = *name,
4715     };
4716     struct nfs_removeres res = {
4717         .server = server,
4718     };
4719     struct rpc_message msg = {
4720         .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
4721         .rpc_argp = &args,
4722         .rpc_resp = &res,
4723     };
4724     unsigned long timestamp = jiffies;
4725     int status;
4726 
4727     status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
4728     if (status == 0) {
4729         spin_lock(&dir->i_lock);
4730         /* Removing a directory decrements nlink in the parent */
4731         if (ftype == NF4DIR && dir->i_nlink > 2)
4732             nfs4_dec_nlink_locked(dir);
4733         nfs4_update_changeattr_locked(dir, &res.cinfo, timestamp,
4734                           NFS_INO_INVALID_DATA);
4735         spin_unlock(&dir->i_lock);
4736     }
4737     return status;
4738 }
4739 
4740 static int nfs4_proc_remove(struct inode *dir, struct dentry *dentry)
4741 {
4742     struct nfs4_exception exception = {
4743         .interruptible = true,
4744     };
4745     struct inode *inode = d_inode(dentry);
4746     int err;
4747 
4748     if (inode) {
4749         if (inode->i_nlink == 1)
4750             nfs4_inode_return_delegation(inode);
4751         else
4752             nfs4_inode_make_writeable(inode);
4753     }
4754     do {
4755         err = _nfs4_proc_remove(dir, &dentry->d_name, NF4REG);
4756         trace_nfs4_remove(dir, &dentry->d_name, err);
4757         err = nfs4_handle_exception(NFS_SERVER(dir), err,
4758                 &exception);
4759     } while (exception.retry);
4760     return err;
4761 }
4762 
4763 static int nfs4_proc_rmdir(struct inode *dir, const struct qstr *name)
4764 {
4765     struct nfs4_exception exception = {
4766         .interruptible = true,
4767     };
4768     int err;
4769 
4770     do {
4771         err = _nfs4_proc_remove(dir, name, NF4DIR);
4772         trace_nfs4_remove(dir, name, err);
4773         err = nfs4_handle_exception(NFS_SERVER(dir), err,
4774                 &exception);
4775     } while (exception.retry);
4776     return err;
4777 }
4778 
4779 static void nfs4_proc_unlink_setup(struct rpc_message *msg,
4780         struct dentry *dentry,
4781         struct inode *inode)
4782 {
4783     struct nfs_removeargs *args = msg->rpc_argp;
4784     struct nfs_removeres *res = msg->rpc_resp;
4785 
4786     res->server = NFS_SB(dentry->d_sb);
4787     msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
4788     nfs4_init_sequence(&args->seq_args, &res->seq_res, 1, 0);
4789 
4790     nfs_fattr_init(res->dir_attr);
4791 
4792     if (inode) {
4793         nfs4_inode_return_delegation(inode);
4794         nfs_d_prune_case_insensitive_aliases(inode);
4795     }
4796 }
4797 
4798 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
4799 {
4800     nfs4_setup_sequence(NFS_SB(data->dentry->d_sb)->nfs_client,
4801             &data->args.seq_args,
4802             &data->res.seq_res,
4803             task);
4804 }
4805 
4806 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
4807 {
4808     struct nfs_unlinkdata *data = task->tk_calldata;
4809     struct nfs_removeres *res = &data->res;
4810 
4811     if (!nfs4_sequence_done(task, &res->seq_res))
4812         return 0;
4813     if (nfs4_async_handle_error(task, res->server, NULL,
4814                     &data->timeout) == -EAGAIN)
4815         return 0;
4816     if (task->tk_status == 0)
4817         nfs4_update_changeattr(dir, &res->cinfo,
4818                 res->dir_attr->time_start,
4819                 NFS_INO_INVALID_DATA);
4820     return 1;
4821 }
4822 
4823 static void nfs4_proc_rename_setup(struct rpc_message *msg,
4824         struct dentry *old_dentry,
4825         struct dentry *new_dentry)
4826 {
4827     struct nfs_renameargs *arg = msg->rpc_argp;
4828     struct nfs_renameres *res = msg->rpc_resp;
4829     struct inode *old_inode = d_inode(old_dentry);
4830     struct inode *new_inode = d_inode(new_dentry);
4831 
4832     if (old_inode)
4833         nfs4_inode_make_writeable(old_inode);
4834     if (new_inode)
4835         nfs4_inode_return_delegation(new_inode);
4836     msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
4837     res->server = NFS_SB(old_dentry->d_sb);
4838     nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1, 0);
4839 }
4840 
4841 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
4842 {
4843     nfs4_setup_sequence(NFS_SERVER(data->old_dir)->nfs_client,
4844             &data->args.seq_args,
4845             &data->res.seq_res,
4846             task);
4847 }
4848 
4849 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
4850                  struct inode *new_dir)
4851 {
4852     struct nfs_renamedata *data = task->tk_calldata;
4853     struct nfs_renameres *res = &data->res;
4854 
4855     if (!nfs4_sequence_done(task, &res->seq_res))
4856         return 0;
4857     if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN)
4858         return 0;
4859 
4860     if (task->tk_status == 0) {
4861         nfs_d_prune_case_insensitive_aliases(d_inode(data->old_dentry));
4862         if (new_dir != old_dir) {
4863             /* Note: If we moved a directory, nlink will change */
4864             nfs4_update_changeattr(old_dir, &res->old_cinfo,
4865                     res->old_fattr->time_start,
4866                     NFS_INO_INVALID_NLINK |
4867                         NFS_INO_INVALID_DATA);
4868             nfs4_update_changeattr(new_dir, &res->new_cinfo,
4869                     res->new_fattr->time_start,
4870                     NFS_INO_INVALID_NLINK |
4871                         NFS_INO_INVALID_DATA);
4872         } else
4873             nfs4_update_changeattr(old_dir, &res->old_cinfo,
4874                     res->old_fattr->time_start,
4875                     NFS_INO_INVALID_DATA);
4876     }
4877     return 1;
4878 }
4879 
4880 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
4881 {
4882     struct nfs_server *server = NFS_SERVER(inode);
4883     __u32 bitmask[NFS4_BITMASK_SZ];
4884     struct nfs4_link_arg arg = {
4885         .fh     = NFS_FH(inode),
4886         .dir_fh = NFS_FH(dir),
4887         .name   = name,
4888         .bitmask = bitmask,
4889     };
4890     struct nfs4_link_res res = {
4891         .server = server,
4892     };
4893     struct rpc_message msg = {
4894         .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
4895         .rpc_argp = &arg,
4896         .rpc_resp = &res,
4897     };
4898     int status = -ENOMEM;
4899 
4900     res.fattr = nfs_alloc_fattr_with_label(server);
4901     if (res.fattr == NULL)
4902         goto out;
4903 
4904     nfs4_inode_make_writeable(inode);
4905     nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, res.fattr->label), inode,
4906                 NFS_INO_INVALID_CHANGE);
4907     status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4908     if (!status) {
4909         nfs4_update_changeattr(dir, &res.cinfo, res.fattr->time_start,
4910                        NFS_INO_INVALID_DATA);
4911         nfs4_inc_nlink(inode);
4912         status = nfs_post_op_update_inode(inode, res.fattr);
4913         if (!status)
4914             nfs_setsecurity(inode, res.fattr);
4915     }
4916 
4917 out:
4918     nfs_free_fattr(res.fattr);
4919     return status;
4920 }
4921 
4922 static int nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
4923 {
4924     struct nfs4_exception exception = {
4925         .interruptible = true,
4926     };
4927     int err;
4928     do {
4929         err = nfs4_handle_exception(NFS_SERVER(inode),
4930                 _nfs4_proc_link(inode, dir, name),
4931                 &exception);
4932     } while (exception.retry);
4933     return err;
4934 }
4935 
4936 struct nfs4_createdata {
4937     struct rpc_message msg;
4938     struct nfs4_create_arg arg;
4939     struct nfs4_create_res res;
4940     struct nfs_fh fh;
4941     struct nfs_fattr fattr;
4942 };
4943 
4944 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
4945         const struct qstr *name, struct iattr *sattr, u32 ftype)
4946 {
4947     struct nfs4_createdata *data;
4948 
4949     data = kzalloc(sizeof(*data), GFP_KERNEL);
4950     if (data != NULL) {
4951         struct nfs_server *server = NFS_SERVER(dir);
4952 
4953         data->fattr.label = nfs4_label_alloc(server, GFP_KERNEL);
4954         if (IS_ERR(data->fattr.label))
4955             goto out_free;
4956 
4957         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
4958         data->msg.rpc_argp = &data->arg;
4959         data->msg.rpc_resp = &data->res;
4960         data->arg.dir_fh = NFS_FH(dir);
4961         data->arg.server = server;
4962         data->arg.name = name;
4963         data->arg.attrs = sattr;
4964         data->arg.ftype = ftype;
4965         data->arg.bitmask = nfs4_bitmask(server, data->fattr.label);
4966         data->arg.umask = current_umask();
4967         data->res.server = server;
4968         data->res.fh = &data->fh;
4969         data->res.fattr = &data->fattr;
4970         nfs_fattr_init(data->res.fattr);
4971     }
4972     return data;
4973 out_free:
4974     kfree(data);
4975     return NULL;
4976 }
4977 
4978 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
4979 {
4980     int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
4981                     &data->arg.seq_args, &data->res.seq_res, 1);
4982     if (status == 0) {
4983         spin_lock(&dir->i_lock);
4984         /* Creating a directory bumps nlink in the parent */
4985         if (data->arg.ftype == NF4DIR)
4986             nfs4_inc_nlink_locked(dir);
4987         nfs4_update_changeattr_locked(dir, &data->res.dir_cinfo,
4988                           data->res.fattr->time_start,
4989                           NFS_INO_INVALID_DATA);
4990         spin_unlock(&dir->i_lock);
4991         status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
4992     }
4993     return status;
4994 }
4995 
4996 static void nfs4_free_createdata(struct nfs4_createdata *data)
4997 {
4998     nfs4_label_free(data->fattr.label);
4999     kfree(data);
5000 }
5001 
5002 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
5003         struct page *page, unsigned int len, struct iattr *sattr,
5004         struct nfs4_label *label)
5005 {
5006     struct nfs4_createdata *data;
5007     int status = -ENAMETOOLONG;
5008 
5009     if (len > NFS4_MAXPATHLEN)
5010         goto out;
5011 
5012     status = -ENOMEM;
5013     data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
5014     if (data == NULL)
5015         goto out;
5016 
5017     data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
5018     data->arg.u.symlink.pages = &page;
5019     data->arg.u.symlink.len = len;
5020     data->arg.label = label;
5021     
5022     status = nfs4_do_create(dir, dentry, data);
5023 
5024     nfs4_free_createdata(data);
5025 out:
5026     return status;
5027 }
5028 
5029 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
5030         struct page *page, unsigned int len, struct iattr *sattr)
5031 {
5032     struct nfs4_exception exception = {
5033         .interruptible = true,
5034     };
5035     struct nfs4_label l, *label = NULL;
5036     int err;
5037 
5038     label = nfs4_label_init_security(dir, dentry, sattr, &l);
5039 
5040     do {
5041         err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label);
5042         trace_nfs4_symlink(dir, &dentry->d_name, err);
5043         err = nfs4_handle_exception(NFS_SERVER(dir), err,
5044                 &exception);
5045     } while (exception.retry);
5046 
5047     nfs4_label_release_security(label);
5048     return err;
5049 }
5050 
5051 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
5052         struct iattr *sattr, struct nfs4_label *label)
5053 {
5054     struct nfs4_createdata *data;
5055     int status = -ENOMEM;
5056 
5057     data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
5058     if (data == NULL)
5059         goto out;
5060 
5061     data->arg.label = label;
5062     status = nfs4_do_create(dir, dentry, data);
5063 
5064     nfs4_free_createdata(data);
5065 out:
5066     return status;
5067 }
5068 
5069 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
5070         struct iattr *sattr)
5071 {
5072     struct nfs_server *server = NFS_SERVER(dir);
5073     struct nfs4_exception exception = {
5074         .interruptible = true,
5075     };
5076     struct nfs4_label l, *label = NULL;
5077     int err;
5078 
5079     label = nfs4_label_init_security(dir, dentry, sattr, &l);
5080 
5081     if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
5082         sattr->ia_mode &= ~current_umask();
5083     do {
5084         err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
5085         trace_nfs4_mkdir(dir, &dentry->d_name, err);
5086         err = nfs4_handle_exception(NFS_SERVER(dir), err,
5087                 &exception);
5088     } while (exception.retry);
5089     nfs4_label_release_security(label);
5090 
5091     return err;
5092 }
5093 
5094 static int _nfs4_proc_readdir(struct nfs_readdir_arg *nr_arg,
5095                   struct nfs_readdir_res *nr_res)
5096 {
5097     struct inode        *dir = d_inode(nr_arg->dentry);
5098     struct nfs_server   *server = NFS_SERVER(dir);
5099     struct nfs4_readdir_arg args = {
5100         .fh = NFS_FH(dir),
5101         .pages = nr_arg->pages,
5102         .pgbase = 0,
5103         .count = nr_arg->page_len,
5104         .plus = nr_arg->plus,
5105     };
5106     struct nfs4_readdir_res res;
5107     struct rpc_message msg = {
5108         .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
5109         .rpc_argp = &args,
5110         .rpc_resp = &res,
5111         .rpc_cred = nr_arg->cred,
5112     };
5113     int         status;
5114 
5115     dprintk("%s: dentry = %pd2, cookie = %llu\n", __func__,
5116         nr_arg->dentry, (unsigned long long)nr_arg->cookie);
5117     if (!(server->caps & NFS_CAP_SECURITY_LABEL))
5118         args.bitmask = server->attr_bitmask_nl;
5119     else
5120         args.bitmask = server->attr_bitmask;
5121 
5122     nfs4_setup_readdir(nr_arg->cookie, nr_arg->verf, nr_arg->dentry, &args);
5123     res.pgbase = args.pgbase;
5124     status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
5125             &res.seq_res, 0);
5126     if (status >= 0) {
5127         memcpy(nr_res->verf, res.verifier.data, NFS4_VERIFIER_SIZE);
5128         status += args.pgbase;
5129     }
5130 
5131     nfs_invalidate_atime(dir);
5132 
5133     dprintk("%s: returns %d\n", __func__, status);
5134     return status;
5135 }
5136 
5137 static int nfs4_proc_readdir(struct nfs_readdir_arg *arg,
5138                  struct nfs_readdir_res *res)
5139 {
5140     struct nfs4_exception exception = {
5141         .interruptible = true,
5142     };
5143     int err;
5144     do {
5145         err = _nfs4_proc_readdir(arg, res);
5146         trace_nfs4_readdir(d_inode(arg->dentry), err);
5147         err = nfs4_handle_exception(NFS_SERVER(d_inode(arg->dentry)),
5148                         err, &exception);
5149     } while (exception.retry);
5150     return err;
5151 }
5152 
5153 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
5154         struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
5155 {
5156     struct nfs4_createdata *data;
5157     int mode = sattr->ia_mode;
5158     int status = -ENOMEM;
5159 
5160     data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
5161     if (data == NULL)
5162         goto out;
5163 
5164     if (S_ISFIFO(mode))
5165         data->arg.ftype = NF4FIFO;
5166     else if (S_ISBLK(mode)) {
5167         data->arg.ftype = NF4BLK;
5168         data->arg.u.device.specdata1 = MAJOR(rdev);
5169         data->arg.u.device.specdata2 = MINOR(rdev);
5170     }
5171     else if (S_ISCHR(mode)) {
5172         data->arg.ftype = NF4CHR;
5173         data->arg.u.device.specdata1 = MAJOR(rdev);
5174         data->arg.u.device.specdata2 = MINOR(rdev);
5175     } else if (!S_ISSOCK(mode)) {
5176         status = -EINVAL;
5177         goto out_free;
5178     }
5179 
5180     data->arg.label = label;
5181     status = nfs4_do_create(dir, dentry, data);
5182 out_free:
5183     nfs4_free_createdata(data);
5184 out:
5185     return status;
5186 }
5187 
5188 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
5189         struct iattr *sattr, dev_t rdev)
5190 {
5191     struct nfs_server *server = NFS_SERVER(dir);
5192     struct nfs4_exception exception = {
5193         .interruptible = true,
5194     };
5195     struct nfs4_label l, *label = NULL;
5196     int err;
5197 
5198     label = nfs4_label_init_security(dir, dentry, sattr, &l);
5199 
5200     if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
5201         sattr->ia_mode &= ~current_umask();
5202     do {
5203         err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
5204         trace_nfs4_mknod(dir, &dentry->d_name, err);
5205         err = nfs4_handle_exception(NFS_SERVER(dir), err,
5206                 &exception);
5207     } while (exception.retry);
5208 
5209     nfs4_label_release_security(label);
5210 
5211     return err;
5212 }
5213 
5214 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
5215          struct nfs_fsstat *fsstat)
5216 {
5217     struct nfs4_statfs_arg args = {
5218         .fh = fhandle,
5219         .bitmask = server->attr_bitmask,
5220     };
5221     struct nfs4_statfs_res res = {
5222         .fsstat = fsstat,
5223     };
5224     struct rpc_message msg = {
5225         .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
5226         .rpc_argp = &args,
5227         .rpc_resp = &res,
5228     };
5229 
5230     nfs_fattr_init(fsstat->fattr);
5231     return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5232 }
5233 
5234 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
5235 {
5236     struct nfs4_exception exception = {
5237         .interruptible = true,
5238     };
5239     int err;
5240     do {
5241         err = nfs4_handle_exception(server,
5242                 _nfs4_proc_statfs(server, fhandle, fsstat),
5243                 &exception);
5244     } while (exception.retry);
5245     return err;
5246 }
5247 
5248 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
5249         struct nfs_fsinfo *fsinfo)
5250 {
5251     struct nfs4_fsinfo_arg args = {
5252         .fh = fhandle,
5253         .bitmask = server->attr_bitmask,
5254     };
5255     struct nfs4_fsinfo_res res = {
5256         .fsinfo = fsinfo,
5257     };
5258     struct rpc_message msg = {
5259         .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
5260         .rpc_argp = &args,
5261         .rpc_resp = &res,
5262     };
5263 
5264     return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5265 }
5266 
5267 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
5268 {
5269     struct nfs4_exception exception = {
5270         .interruptible = true,
5271     };
5272     int err;
5273 
5274     do {
5275         err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
5276         trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
5277         if (err == 0) {
5278             nfs4_set_lease_period(server->nfs_client, fsinfo->lease_time * HZ);
5279             break;
5280         }
5281         err = nfs4_handle_exception(server, err, &exception);
5282     } while (exception.retry);
5283     return err;
5284 }
5285 
5286 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
5287 {
5288     int error;
5289 
5290     nfs_fattr_init(fsinfo->fattr);
5291     error = nfs4_do_fsinfo(server, fhandle, fsinfo);
5292     if (error == 0) {
5293         /* block layout checks this! */
5294         server->pnfs_blksize = fsinfo->blksize;
5295         set_pnfs_layoutdriver(server, fhandle, fsinfo);
5296     }
5297 
5298     return error;
5299 }
5300 
5301 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
5302         struct nfs_pathconf *pathconf)
5303 {
5304     struct nfs4_pathconf_arg args = {
5305         .fh = fhandle,
5306         .bitmask = server->attr_bitmask,
5307     };
5308     struct nfs4_pathconf_res res = {
5309         .pathconf = pathconf,
5310     };
5311     struct rpc_message msg = {
5312         .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
5313         .rpc_argp = &args,
5314         .rpc_resp = &res,
5315     };
5316 
5317     /* None of the pathconf attributes are mandatory to implement */
5318     if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
5319         memset(pathconf, 0, sizeof(*pathconf));
5320         return 0;
5321     }
5322 
5323     nfs_fattr_init(pathconf->fattr);
5324     return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5325 }
5326 
5327 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
5328         struct nfs_pathconf *pathconf)
5329 {
5330     struct nfs4_exception exception = {
5331         .interruptible = true,
5332     };
5333     int err;
5334 
5335     do {
5336         err = nfs4_handle_exception(server,
5337                 _nfs4_proc_pathconf(server, fhandle, pathconf),
5338                 &exception);
5339     } while (exception.retry);
5340     return err;
5341 }
5342 
5343 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
5344         const struct nfs_open_context *ctx,
5345         const struct nfs_lock_context *l_ctx,
5346         fmode_t fmode)
5347 {
5348     return nfs4_select_rw_stateid(ctx->state, fmode, l_ctx, stateid, NULL);
5349 }
5350 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
5351 
5352 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
5353         const struct nfs_open_context *ctx,
5354         const struct nfs_lock_context *l_ctx,
5355         fmode_t fmode)
5356 {
5357     nfs4_stateid _current_stateid;
5358 
5359     /* If the current stateid represents a lost lock, then exit */
5360     if (nfs4_set_rw_stateid(&_current_stateid, ctx, l_ctx, fmode) == -EIO)
5361         return true;
5362     return nfs4_stateid_match(stateid, &_current_stateid);
5363 }
5364 
5365 static bool nfs4_error_stateid_expired(int err)
5366 {
5367     switch (err) {
5368     case -NFS4ERR_DELEG_REVOKED:
5369     case -NFS4ERR_ADMIN_REVOKED:
5370     case -NFS4ERR_BAD_STATEID:
5371     case -NFS4ERR_STALE_STATEID:
5372     case -NFS4ERR_OLD_STATEID:
5373     case -NFS4ERR_OPENMODE:
5374     case -NFS4ERR_EXPIRED:
5375         return true;
5376     }
5377     return false;
5378 }
5379 
5380 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr)
5381 {
5382     struct nfs_server *server = NFS_SERVER(hdr->inode);
5383 
5384     trace_nfs4_read(hdr, task->tk_status);
5385     if (task->tk_status < 0) {
5386         struct nfs4_exception exception = {
5387             .inode = hdr->inode,
5388             .state = hdr->args.context->state,
5389             .stateid = &hdr->args.stateid,
5390         };
5391         task->tk_status = nfs4_async_handle_exception(task,
5392                 server, task->tk_status, &exception);
5393         if (exception.retry) {
5394             rpc_restart_call_prepare(task);
5395             return -EAGAIN;
5396         }
5397     }
5398 
5399     if (task->tk_status > 0)
5400         renew_lease(server, hdr->timestamp);
5401     return 0;
5402 }
5403 
5404 static bool nfs4_read_stateid_changed(struct rpc_task *task,
5405         struct nfs_pgio_args *args)
5406 {
5407 
5408     if (!nfs4_error_stateid_expired(task->tk_status) ||
5409         nfs4_stateid_is_current(&args->stateid,
5410                 args->context,
5411                 args->lock_context,
5412                 FMODE_READ))
5413         return false;
5414     rpc_restart_call_prepare(task);
5415     return true;
5416 }
5417 
5418 static bool nfs4_read_plus_not_supported(struct rpc_task *task,
5419                      struct nfs_pgio_header *hdr)
5420 {
5421     struct nfs_server *server = NFS_SERVER(hdr->inode);
5422     struct rpc_message *msg = &task->tk_msg;
5423 
5424     if (msg->rpc_proc == &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS] &&
5425         server->caps & NFS_CAP_READ_PLUS && task->tk_status == -ENOTSUPP) {
5426         server->caps &= ~NFS_CAP_READ_PLUS;
5427         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
5428         rpc_restart_call_prepare(task);
5429         return true;
5430     }
5431     return false;
5432 }
5433 
5434 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
5435 {
5436     if (!nfs4_sequence_done(task, &hdr->res.seq_res))
5437         return -EAGAIN;
5438     if (nfs4_read_stateid_changed(task, &hdr->args))
5439         return -EAGAIN;
5440     if (nfs4_read_plus_not_supported(task, hdr))
5441         return -EAGAIN;
5442     if (task->tk_status > 0)
5443         nfs_invalidate_atime(hdr->inode);
5444     return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
5445                     nfs4_read_done_cb(task, hdr);
5446 }
5447 
5448 #if defined CONFIG_NFS_V4_2 && defined CONFIG_NFS_V4_2_READ_PLUS
5449 static void nfs42_read_plus_support(struct nfs_pgio_header *hdr,
5450                     struct rpc_message *msg)
5451 {
5452     /* Note: We don't use READ_PLUS with pNFS yet */
5453     if (nfs_server_capable(hdr->inode, NFS_CAP_READ_PLUS) && !hdr->ds_clp)
5454         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS];
5455 }
5456 #else
5457 static void nfs42_read_plus_support(struct nfs_pgio_header *hdr,
5458                     struct rpc_message *msg)
5459 {
5460 }
5461 #endif /* CONFIG_NFS_V4_2 */
5462 
5463 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr,
5464                  struct rpc_message *msg)
5465 {
5466     hdr->timestamp   = jiffies;
5467     if (!hdr->pgio_done_cb)
5468         hdr->pgio_done_cb = nfs4_read_done_cb;
5469     msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
5470     nfs42_read_plus_support(hdr, msg);
5471     nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0);
5472 }
5473 
5474 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task,
5475                       struct nfs_pgio_header *hdr)
5476 {
5477     if (nfs4_setup_sequence(NFS_SERVER(hdr->inode)->nfs_client,
5478             &hdr->args.seq_args,
5479             &hdr->res.seq_res,
5480             task))
5481         return 0;
5482     if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
5483                 hdr->args.lock_context,
5484                 hdr->rw_mode) == -EIO)
5485         return -EIO;
5486     if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags)))
5487         return -EIO;
5488     return 0;
5489 }
5490 
5491 static int nfs4_write_done_cb(struct rpc_task *task,
5492                   struct nfs_pgio_header *hdr)
5493 {
5494     struct inode *inode = hdr->inode;
5495 
5496     trace_nfs4_write(hdr, task->tk_status);
5497     if (task->tk_status < 0) {
5498         struct nfs4_exception exception = {
5499             .inode = hdr->inode,
5500             .state = hdr->args.context->state,
5501             .stateid = &hdr->args.stateid,
5502         };
5503         task->tk_status = nfs4_async_handle_exception(task,
5504                 NFS_SERVER(inode), task->tk_status,
5505                 &exception);
5506         if (exception.retry) {
5507             rpc_restart_call_prepare(task);
5508             return -EAGAIN;
5509         }
5510     }
5511     if (task->tk_status >= 0) {
5512         renew_lease(NFS_SERVER(inode), hdr->timestamp);
5513         nfs_writeback_update_inode(hdr);
5514     }
5515     return 0;
5516 }
5517 
5518 static bool nfs4_write_stateid_changed(struct rpc_task *task,
5519         struct nfs_pgio_args *args)
5520 {
5521 
5522     if (!nfs4_error_stateid_expired(task->tk_status) ||
5523         nfs4_stateid_is_current(&args->stateid,
5524                 args->context,
5525                 args->lock_context,
5526                 FMODE_WRITE))
5527         return false;
5528     rpc_restart_call_prepare(task);
5529     return true;
5530 }
5531 
5532 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
5533 {
5534     if (!nfs4_sequence_done(task, &hdr->res.seq_res))
5535         return -EAGAIN;
5536     if (nfs4_write_stateid_changed(task, &hdr->args))
5537         return -EAGAIN;
5538     return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
5539         nfs4_write_done_cb(task, hdr);
5540 }
5541 
5542 static
5543 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr)
5544 {
5545     /* Don't request attributes for pNFS or O_DIRECT writes */
5546     if (hdr->ds_clp != NULL || hdr->dreq != NULL)
5547         return false;
5548     /* Otherwise, request attributes if and only if we don't hold
5549      * a delegation
5550      */
5551     return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
5552 }
5553 
5554 void nfs4_bitmask_set(__u32 bitmask[], const __u32 src[],
5555               struct inode *inode, unsigned long cache_validity)
5556 {
5557     struct nfs_server *server = NFS_SERVER(inode);
5558     unsigned int i;
5559 
5560     memcpy(bitmask, src, sizeof(*bitmask) * NFS4_BITMASK_SZ);
5561     cache_validity |= READ_ONCE(NFS_I(inode)->cache_validity);
5562 
5563     if (cache_validity & NFS_INO_INVALID_CHANGE)
5564         bitmask[0] |= FATTR4_WORD0_CHANGE;
5565     if (cache_validity & NFS_INO_INVALID_ATIME)
5566         bitmask[1] |= FATTR4_WORD1_TIME_ACCESS;
5567     if (cache_validity & NFS_INO_INVALID_MODE)
5568         bitmask[1] |= FATTR4_WORD1_MODE;
5569     if (cache_validity & NFS_INO_INVALID_OTHER)
5570         bitmask[1] |= FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP;
5571     if (cache_validity & NFS_INO_INVALID_NLINK)
5572         bitmask[1] |= FATTR4_WORD1_NUMLINKS;
5573     if (cache_validity & NFS_INO_INVALID_CTIME)
5574         bitmask[1] |= FATTR4_WORD1_TIME_METADATA;
5575     if (cache_validity & NFS_INO_INVALID_MTIME)
5576         bitmask[1] |= FATTR4_WORD1_TIME_MODIFY;
5577     if (cache_validity & NFS_INO_INVALID_BLOCKS)
5578         bitmask[1] |= FATTR4_WORD1_SPACE_USED;
5579 
5580     if (cache_validity & NFS_INO_INVALID_SIZE)
5581         bitmask[0] |= FATTR4_WORD0_SIZE;
5582 
5583     for (i = 0; i < NFS4_BITMASK_SZ; i++)
5584         bitmask[i] &= server->attr_bitmask[i];
5585 }
5586 
5587 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr,
5588                   struct rpc_message *msg,
5589                   struct rpc_clnt **clnt)
5590 {
5591     struct nfs_server *server = NFS_SERVER(hdr->inode);
5592 
5593     if (!nfs4_write_need_cache_consistency_data(hdr)) {
5594         hdr->args.bitmask = NULL;
5595         hdr->res.fattr = NULL;
5596     } else {
5597         nfs4_bitmask_set(hdr->args.bitmask_store,
5598                  server->cache_consistency_bitmask,
5599                  hdr->inode, NFS_INO_INVALID_BLOCKS);
5600         hdr->args.bitmask = hdr->args.bitmask_store;
5601     }
5602 
5603     if (!hdr->pgio_done_cb)
5604         hdr->pgio_done_cb = nfs4_write_done_cb;
5605     hdr->res.server = server;
5606     hdr->timestamp   = jiffies;
5607 
5608     msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
5609     nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0);
5610     nfs4_state_protect_write(server->nfs_client, clnt, msg, hdr);
5611 }
5612 
5613 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
5614 {
5615     nfs4_setup_sequence(NFS_SERVER(data->inode)->nfs_client,
5616             &data->args.seq_args,
5617             &data->res.seq_res,
5618             task);
5619 }
5620 
5621 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
5622 {
5623     struct inode *inode = data->inode;
5624 
5625     trace_nfs4_commit(data, task->tk_status);
5626     if (nfs4_async_handle_error(task, NFS_SERVER(inode),
5627                     NULL, NULL) == -EAGAIN) {
5628         rpc_restart_call_prepare(task);
5629         return -EAGAIN;
5630     }
5631     return 0;
5632 }
5633 
5634 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
5635 {
5636     if (!nfs4_sequence_done(task, &data->res.seq_res))
5637         return -EAGAIN;
5638     return data->commit_done_cb(task, data);
5639 }
5640 
5641 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg,
5642                    struct rpc_clnt **clnt)
5643 {
5644     struct nfs_server *server = NFS_SERVER(data->inode);
5645 
5646     if (data->commit_done_cb == NULL)
5647         data->commit_done_cb = nfs4_commit_done_cb;
5648     data->res.server = server;
5649     msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
5650     nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0);
5651     nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_COMMIT, clnt, msg);
5652 }
5653 
5654 static int _nfs4_proc_commit(struct file *dst, struct nfs_commitargs *args,
5655                 struct nfs_commitres *res)
5656 {
5657     struct inode *dst_inode = file_inode(dst);
5658     struct nfs_server *server = NFS_SERVER(dst_inode);
5659     struct rpc_message msg = {
5660         .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
5661         .rpc_argp = args,
5662         .rpc_resp = res,
5663     };
5664 
5665     args->fh = NFS_FH(dst_inode);
5666     return nfs4_call_sync(server->client, server, &msg,
5667             &args->seq_args, &res->seq_res, 1);
5668 }
5669 
5670 int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res)
5671 {
5672     struct nfs_commitargs args = {
5673         .offset = offset,
5674         .count = count,
5675     };
5676     struct nfs_server *dst_server = NFS_SERVER(file_inode(dst));
5677     struct nfs4_exception exception = { };
5678     int status;
5679 
5680     do {
5681         status = _nfs4_proc_commit(dst, &args, res);
5682         status = nfs4_handle_exception(dst_server, status, &exception);
5683     } while (exception.retry);
5684 
5685     return status;
5686 }
5687 
5688 struct nfs4_renewdata {
5689     struct nfs_client   *client;
5690     unsigned long       timestamp;
5691 };
5692 
5693 /*
5694  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
5695  * standalone procedure for queueing an asynchronous RENEW.
5696  */
5697 static void nfs4_renew_release(void *calldata)
5698 {
5699     struct nfs4_renewdata *data = calldata;
5700     struct nfs_client *clp = data->client;
5701 
5702     if (refcount_read(&clp->cl_count) > 1)
5703         nfs4_schedule_state_renewal(clp);
5704     nfs_put_client(clp);
5705     kfree(data);
5706 }
5707 
5708 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
5709 {
5710     struct nfs4_renewdata *data = calldata;
5711     struct nfs_client *clp = data->client;
5712     unsigned long timestamp = data->timestamp;
5713 
5714     trace_nfs4_renew_async(clp, task->tk_status);
5715     switch (task->tk_status) {
5716     case 0:
5717         break;
5718     case -NFS4ERR_LEASE_MOVED:
5719         nfs4_schedule_lease_moved_recovery(clp);
5720         break;
5721     default:
5722         /* Unless we're shutting down, schedule state recovery! */
5723         if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
5724             return;
5725         if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
5726             nfs4_schedule_lease_recovery(clp);
5727             return;
5728         }
5729         nfs4_schedule_path_down_recovery(clp);
5730     }
5731     do_renew_lease(clp, timestamp);
5732 }
5733 
5734 static const struct rpc_call_ops nfs4_renew_ops = {
5735     .rpc_call_done = nfs4_renew_done,
5736     .rpc_release = nfs4_renew_release,
5737 };
5738 
5739 static int nfs4_proc_async_renew(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags)
5740 {
5741     struct rpc_message msg = {
5742         .rpc_proc   = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
5743         .rpc_argp   = clp,
5744         .rpc_cred   = cred,
5745     };
5746     struct nfs4_renewdata *data;
5747 
5748     if (renew_flags == 0)
5749         return 0;
5750     if (!refcount_inc_not_zero(&clp->cl_count))
5751         return -EIO;
5752     data = kmalloc(sizeof(*data), GFP_NOFS);
5753     if (data == NULL) {
5754         nfs_put_client(clp);
5755         return -ENOMEM;
5756     }
5757     data->client = clp;
5758     data->timestamp = jiffies;
5759     return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
5760             &nfs4_renew_ops, data);
5761 }
5762 
5763 static int nfs4_proc_renew(struct nfs_client *clp, const struct cred *cred)
5764 {
5765     struct rpc_message msg = {
5766         .rpc_proc   = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
5767         .rpc_argp   = clp,
5768         .rpc_cred   = cred,
5769     };
5770     unsigned long now = jiffies;
5771     int status;
5772 
5773     status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5774     if (status < 0)
5775         return status;
5776     do_renew_lease(clp, now);
5777     return 0;
5778 }
5779 
5780 static bool nfs4_server_supports_acls(const struct nfs_server *server,
5781                       enum nfs4_acl_type type)
5782 {
5783     switch (type) {
5784     default:
5785         return server->attr_bitmask[0] & FATTR4_WORD0_ACL;
5786     case NFS4ACL_DACL:
5787         return server->attr_bitmask[1] & FATTR4_WORD1_DACL;
5788     case NFS4ACL_SACL:
5789         return server->attr_bitmask[1] & FATTR4_WORD1_SACL;
5790     }
5791 }
5792 
5793 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
5794  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
5795  * the stack.
5796  */
5797 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
5798 
5799 int nfs4_buf_to_pages_noslab(const void *buf, size_t buflen,
5800         struct page **pages)
5801 {
5802     struct page *newpage, **spages;
5803     int rc = 0;
5804     size_t len;
5805     spages = pages;
5806 
5807     do {
5808         len = min_t(size_t, PAGE_SIZE, buflen);
5809         newpage = alloc_page(GFP_KERNEL);
5810 
5811         if (newpage == NULL)
5812             goto unwind;
5813         memcpy(page_address(newpage), buf, len);
5814         buf += len;
5815         buflen -= len;
5816         *pages++ = newpage;
5817         rc++;
5818     } while (buflen != 0);
5819 
5820     return rc;
5821 
5822 unwind:
5823     for(; rc > 0; rc--)
5824         __free_page(spages[rc-1]);
5825     return -ENOMEM;
5826 }
5827 
5828 struct nfs4_cached_acl {
5829     enum nfs4_acl_type type;
5830     int cached;
5831     size_t len;
5832     char data[];
5833 };
5834 
5835 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
5836 {
5837     struct nfs_inode *nfsi = NFS_I(inode);
5838 
5839     spin_lock(&inode->i_lock);
5840     kfree(nfsi->nfs4_acl);
5841     nfsi->nfs4_acl = acl;
5842     spin_unlock(&inode->i_lock);
5843 }
5844 
5845 static void nfs4_zap_acl_attr(struct inode *inode)
5846 {
5847     nfs4_set_cached_acl(inode, NULL);
5848 }
5849 
5850 static ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf,
5851                     size_t buflen, enum nfs4_acl_type type)
5852 {
5853     struct nfs_inode *nfsi = NFS_I(inode);
5854     struct nfs4_cached_acl *acl;
5855     int ret = -ENOENT;
5856 
5857     spin_lock(&inode->i_lock);
5858     acl = nfsi->nfs4_acl;
5859     if (acl == NULL)
5860         goto out;
5861     if (acl->type != type)
5862         goto out;
5863     if (buf == NULL) /* user is just asking for length */
5864         goto out_len;
5865     if (acl->cached == 0)
5866         goto out;
5867     ret = -ERANGE; /* see getxattr(2) man page */
5868     if (acl->len > buflen)
5869         goto out;
5870     memcpy(buf, acl->data, acl->len);
5871 out_len:
5872     ret = acl->len;
5873 out:
5874     spin_unlock(&inode->i_lock);
5875     return ret;
5876 }
5877 
5878 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages,
5879                   size_t pgbase, size_t acl_len,
5880                   enum nfs4_acl_type type)
5881 {
5882     struct nfs4_cached_acl *acl;
5883     size_t buflen = sizeof(*acl) + acl_len;
5884 
5885     if (buflen <= PAGE_SIZE) {
5886         acl = kmalloc(buflen, GFP_KERNEL);
5887         if (acl == NULL)
5888             goto out;
5889         acl->cached = 1;
5890         _copy_from_pages(acl->data, pages, pgbase, acl_len);
5891     } else {
5892         acl = kmalloc(sizeof(*acl), GFP_KERNEL);
5893         if (acl == NULL)
5894             goto out;
5895         acl->cached = 0;
5896     }
5897     acl->type = type;
5898     acl->len = acl_len;
5899 out:
5900     nfs4_set_cached_acl(inode, acl);
5901 }
5902 
5903 /*
5904  * The getxattr API returns the required buffer length when called with a
5905  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
5906  * the required buf.  On a NULL buf, we send a page of data to the server
5907  * guessing that the ACL request can be serviced by a page. If so, we cache
5908  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
5909  * the cache. If not so, we throw away the page, and cache the required
5910  * length. The next getxattr call will then produce another round trip to
5911  * the server, this time with the input buf of the required size.
5912  */
5913 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf,
5914                        size_t buflen, enum nfs4_acl_type type)
5915 {
5916     struct page **pages;
5917     struct nfs_getaclargs args = {
5918         .fh = NFS_FH(inode),
5919         .acl_type = type,
5920         .acl_len = buflen,
5921     };
5922     struct nfs_getaclres res = {
5923         .acl_type = type,
5924         .acl_len = buflen,
5925     };
5926     struct rpc_message msg = {
5927         .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
5928         .rpc_argp = &args,
5929         .rpc_resp = &res,
5930     };
5931     unsigned int npages;
5932     int ret = -ENOMEM, i;
5933     struct nfs_server *server = NFS_SERVER(inode);
5934 
5935     if (buflen == 0)
5936         buflen = server->rsize;
5937 
5938     npages = DIV_ROUND_UP(buflen, PAGE_SIZE) + 1;
5939     pages = kmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
5940     if (!pages)
5941         return -ENOMEM;
5942 
5943     args.acl_pages = pages;
5944 
5945     for (i = 0; i < npages; i++) {
5946         pages[i] = alloc_page(GFP_KERNEL);
5947         if (!pages[i])
5948             goto out_free;
5949     }
5950 
5951     /* for decoding across pages */
5952     res.acl_scratch = alloc_page(GFP_KERNEL);
5953     if (!res.acl_scratch)
5954         goto out_free;
5955 
5956     args.acl_len = npages * PAGE_SIZE;
5957 
5958     dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
5959         __func__, buf, buflen, npages, args.acl_len);
5960     ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
5961                  &msg, &args.seq_args, &res.seq_res, 0);
5962     if (ret)
5963         goto out_free;
5964 
5965     /* Handle the case where the passed-in buffer is too short */
5966     if (res.acl_flags & NFS4_ACL_TRUNC) {
5967         /* Did the user only issue a request for the acl length? */
5968         if (buf == NULL)
5969             goto out_ok;
5970         ret = -ERANGE;
5971         goto out_free;
5972     }
5973     nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len,
5974                   type);
5975     if (buf) {
5976         if (res.acl_len > buflen) {
5977             ret = -ERANGE;
5978             goto out_free;
5979         }
5980         _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
5981     }
5982 out_ok:
5983     ret = res.acl_len;
5984 out_free:
5985     for (i = 0; i < npages; i++)
5986         if (pages[i])
5987             __free_page(pages[i]);
5988     if (res.acl_scratch)
5989         __free_page(res.acl_scratch);
5990     kfree(pages);
5991     return ret;
5992 }
5993 
5994 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf,
5995                      size_t buflen, enum nfs4_acl_type type)
5996 {
5997     struct nfs4_exception exception = {
5998         .interruptible = true,
5999     };
6000     ssize_t ret;
6001     do {
6002         ret = __nfs4_get_acl_uncached(inode, buf, buflen, type);
6003         trace_nfs4_get_acl(inode, ret);
6004         if (ret >= 0)
6005             break;
6006         ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
6007     } while (exception.retry);
6008     return ret;
6009 }
6010 
6011 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen,
6012                  enum nfs4_acl_type type)
6013 {
6014     struct nfs_server *server = NFS_SERVER(inode);
6015     int ret;
6016 
6017     if (!nfs4_server_supports_acls(server, type))
6018         return -EOPNOTSUPP;
6019     ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE);
6020     if (ret < 0)
6021         return ret;
6022     if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
6023         nfs_zap_acl_cache(inode);
6024     ret = nfs4_read_cached_acl(inode, buf, buflen, type);
6025     if (ret != -ENOENT)
6026         /* -ENOENT is returned if there is no ACL or if there is an ACL
6027          * but no cached acl data, just the acl length */
6028         return ret;
6029     return nfs4_get_acl_uncached(inode, buf, buflen, type);
6030 }
6031 
6032 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf,
6033                    size_t buflen, enum nfs4_acl_type type)
6034 {
6035     struct nfs_server *server = NFS_SERVER(inode);
6036     struct page *pages[NFS4ACL_MAXPAGES];
6037     struct nfs_setaclargs arg = {
6038         .fh = NFS_FH(inode),
6039         .acl_type = type,
6040         .acl_len = buflen,
6041         .acl_pages = pages,
6042     };
6043     struct nfs_setaclres res;
6044     struct rpc_message msg = {
6045         .rpc_proc   = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
6046         .rpc_argp   = &arg,
6047         .rpc_resp   = &res,
6048     };
6049     unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
6050     int ret, i;
6051 
6052     /* You can't remove system.nfs4_acl: */
6053     if (buflen == 0)
6054         return -EINVAL;
6055     if (!nfs4_server_supports_acls(server, type))
6056         return -EOPNOTSUPP;
6057     if (npages > ARRAY_SIZE(pages))
6058         return -ERANGE;
6059     i = nfs4_buf_to_pages_noslab(buf, buflen, arg.acl_pages);
6060     if (i < 0)
6061         return i;
6062     nfs4_inode_make_writeable(inode);
6063     ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
6064 
6065     /*
6066      * Free each page after tx, so the only ref left is
6067      * held by the network stack
6068      */
6069     for (; i > 0; i--)
6070         put_page(pages[i-1]);
6071 
6072     /*
6073      * Acl update can result in inode attribute update.
6074      * so mark the attribute cache invalid.
6075      */
6076     spin_lock(&inode->i_lock);
6077     nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE |
6078                          NFS_INO_INVALID_CTIME |
6079                          NFS_INO_REVAL_FORCED);
6080     spin_unlock(&inode->i_lock);
6081     nfs_access_zap_cache(inode);
6082     nfs_zap_acl_cache(inode);
6083     return ret;
6084 }
6085 
6086 static int nfs4_proc_set_acl(struct inode *inode, const void *buf,
6087                  size_t buflen, enum nfs4_acl_type type)
6088 {
6089     struct nfs4_exception exception = { };
6090     int err;
6091     do {
6092         err = __nfs4_proc_set_acl(inode, buf, buflen, type);
6093         trace_nfs4_set_acl(inode, err);
6094         if (err == -NFS4ERR_BADOWNER || err == -NFS4ERR_BADNAME) {
6095             /*
6096              * no need to retry since the kernel
6097              * isn't involved in encoding the ACEs.
6098              */
6099             err = -EINVAL;
6100             break;
6101         }
6102         err = nfs4_handle_exception(NFS_SERVER(inode), err,
6103                 &exception);
6104     } while (exception.retry);
6105     return err;
6106 }
6107 
6108 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
6109 static int _nfs4_get_security_label(struct inode *inode, void *buf,
6110                     size_t buflen)
6111 {
6112     struct nfs_server *server = NFS_SERVER(inode);
6113     struct nfs4_label label = {0, 0, buflen, buf};
6114 
6115     u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
6116     struct nfs_fattr fattr = {
6117         .label = &label,
6118     };
6119     struct nfs4_getattr_arg arg = {
6120         .fh     = NFS_FH(inode),
6121         .bitmask    = bitmask,
6122     };
6123     struct nfs4_getattr_res res = {
6124         .fattr      = &fattr,
6125         .server     = server,
6126     };
6127     struct rpc_message msg = {
6128         .rpc_proc   = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
6129         .rpc_argp   = &arg,
6130         .rpc_resp   = &res,
6131     };
6132     int ret;
6133 
6134     nfs_fattr_init(&fattr);
6135 
6136     ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0);
6137     if (ret)
6138         return ret;
6139     if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
6140         return -ENOENT;
6141     return label.len;
6142 }
6143 
6144 static int nfs4_get_security_label(struct inode *inode, void *buf,
6145                     size_t buflen)
6146 {
6147     struct nfs4_exception exception = {
6148         .interruptible = true,
6149     };
6150     int err;
6151 
6152     if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
6153         return -EOPNOTSUPP;
6154 
6155     do {
6156         err = _nfs4_get_security_label(inode, buf, buflen);
6157         trace_nfs4_get_security_label(inode, err);
6158         err = nfs4_handle_exception(NFS_SERVER(inode), err,
6159                 &exception);
6160     } while (exception.retry);
6161     return err;
6162 }
6163 
6164 static int _nfs4_do_set_security_label(struct inode *inode,
6165         struct nfs4_label *ilabel,
6166         struct nfs_fattr *fattr)
6167 {
6168 
6169     struct iattr sattr = {0};
6170     struct nfs_server *server = NFS_SERVER(inode);
6171     const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
6172     struct nfs_setattrargs arg = {
6173         .fh     = NFS_FH(inode),
6174         .iap        = &sattr,
6175         .server     = server,
6176         .bitmask    = bitmask,
6177         .label      = ilabel,
6178     };
6179     struct nfs_setattrres res = {
6180         .fattr      = fattr,
6181         .server     = server,
6182     };
6183     struct rpc_message msg = {
6184         .rpc_proc   = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
6185         .rpc_argp   = &arg,
6186         .rpc_resp   = &res,
6187     };
6188     int status;
6189 
6190     nfs4_stateid_copy(&arg.stateid, &zero_stateid);
6191 
6192     status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
6193     if (status)
6194         dprintk("%s failed: %d\n", __func__, status);
6195 
6196     return status;
6197 }
6198 
6199 static int nfs4_do_set_security_label(struct inode *inode,
6200         struct nfs4_label *ilabel,
6201         struct nfs_fattr *fattr)
6202 {
6203     struct nfs4_exception exception = { };
6204     int err;
6205 
6206     do {
6207         err = _nfs4_do_set_security_label(inode, ilabel, fattr);
6208         trace_nfs4_set_security_label(inode, err);
6209         err = nfs4_handle_exception(NFS_SERVER(inode), err,
6210                 &exception);
6211     } while (exception.retry);
6212     return err;
6213 }
6214 
6215 static int
6216 nfs4_set_security_label(struct inode *inode, const void *buf, size_t buflen)
6217 {
6218     struct nfs4_label ilabel = {0, 0, buflen, (char *)buf };
6219     struct nfs_fattr *fattr;
6220     int status;
6221 
6222     if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
6223         return -EOPNOTSUPP;
6224 
6225     fattr = nfs_alloc_fattr_with_label(NFS_SERVER(inode));
6226     if (fattr == NULL)
6227         return -ENOMEM;
6228 
6229     status = nfs4_do_set_security_label(inode, &ilabel, fattr);
6230     if (status == 0)
6231         nfs_setsecurity(inode, fattr);
6232 
6233     return status;
6234 }
6235 #endif  /* CONFIG_NFS_V4_SECURITY_LABEL */
6236 
6237 
6238 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
6239                     nfs4_verifier *bootverf)
6240 {
6241     __be32 verf[2];
6242 
6243     if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
6244         /* An impossible timestamp guarantees this value
6245          * will never match a generated boot time. */
6246         verf[0] = cpu_to_be32(U32_MAX);
6247         verf[1] = cpu_to_be32(U32_MAX);
6248     } else {
6249         struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
6250         u64 ns = ktime_to_ns(nn->boot_time);
6251 
6252         verf[0] = cpu_to_be32(ns >> 32);
6253         verf[1] = cpu_to_be32(ns);
6254     }
6255     memcpy(bootverf->data, verf, sizeof(bootverf->data));
6256 }
6257 
6258 static size_t
6259 nfs4_get_uniquifier(struct nfs_client *clp, char *buf, size_t buflen)
6260 {
6261     struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
6262     struct nfs_netns_client *nn_clp = nn->nfs_client;
6263     const char *id;
6264 
6265     buf[0] = '\0';
6266 
6267     if (nn_clp) {
6268         rcu_read_lock();
6269         id = rcu_dereference(nn_clp->identifier);
6270         if (id)
6271             strscpy(buf, id, buflen);
6272         rcu_read_unlock();
6273     }
6274 
6275     if (nfs4_client_id_uniquifier[0] != '\0' && buf[0] == '\0')
6276         strscpy(buf, nfs4_client_id_uniquifier, buflen);
6277 
6278     return strlen(buf);
6279 }
6280 
6281 static int
6282 nfs4_init_nonuniform_client_string(struct nfs_client *clp)
6283 {
6284     char buf[NFS4_CLIENT_ID_UNIQ_LEN];
6285     size_t buflen;
6286     size_t len;
6287     char *str;
6288 
6289     if (clp->cl_owner_id != NULL)
6290         return 0;
6291 
6292     rcu_read_lock();
6293     len = 14 +
6294         strlen(clp->cl_rpcclient->cl_nodename) +
6295         1 +
6296         strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)) +
6297         1;
6298     rcu_read_unlock();
6299 
6300     buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf));
6301     if (buflen)
6302         len += buflen + 1;
6303 
6304     if (len > NFS4_OPAQUE_LIMIT + 1)
6305         return -EINVAL;
6306 
6307     /*
6308      * Since this string is allocated at mount time, and held until the
6309      * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
6310      * about a memory-reclaim deadlock.
6311      */
6312     str = kmalloc(len, GFP_KERNEL);
6313     if (!str)
6314         return -ENOMEM;
6315 
6316     rcu_read_lock();
6317     if (buflen)
6318         scnprintf(str, len, "Linux NFSv4.0 %s/%s/%s",
6319               clp->cl_rpcclient->cl_nodename, buf,
6320               rpc_peeraddr2str(clp->cl_rpcclient,
6321                        RPC_DISPLAY_ADDR));
6322     else
6323         scnprintf(str, len, "Linux NFSv4.0 %s/%s",
6324               clp->cl_rpcclient->cl_nodename,
6325               rpc_peeraddr2str(clp->cl_rpcclient,
6326                        RPC_DISPLAY_ADDR));
6327     rcu_read_unlock();
6328 
6329     clp->cl_owner_id = str;
6330     return 0;
6331 }
6332 
6333 static int
6334 nfs4_init_uniform_client_string(struct nfs_client *clp)
6335 {
6336     char buf[NFS4_CLIENT_ID_UNIQ_LEN];
6337     size_t buflen;
6338     size_t len;
6339     char *str;
6340 
6341     if (clp->cl_owner_id != NULL)
6342         return 0;
6343 
6344     len = 10 + 10 + 1 + 10 + 1 +
6345         strlen(clp->cl_rpcclient->cl_nodename) + 1;
6346 
6347     buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf));
6348     if (buflen)
6349         len += buflen + 1;
6350 
6351     if (len > NFS4_OPAQUE_LIMIT + 1)
6352         return -EINVAL;
6353 
6354     /*
6355      * Since this string is allocated at mount time, and held until the
6356      * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
6357      * about a memory-reclaim deadlock.
6358      */
6359     str = kmalloc(len, GFP_KERNEL);
6360     if (!str)
6361         return -ENOMEM;
6362 
6363     if (buflen)
6364         scnprintf(str, len, "Linux NFSv%u.%u %s/%s",
6365               clp->rpc_ops->version, clp->cl_minorversion,
6366               buf, clp->cl_rpcclient->cl_nodename);
6367     else
6368         scnprintf(str, len, "Linux NFSv%u.%u %s",
6369               clp->rpc_ops->version, clp->cl_minorversion,
6370               clp->cl_rpcclient->cl_nodename);
6371     clp->cl_owner_id = str;
6372     return 0;
6373 }
6374 
6375 /*
6376  * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback
6377  * services.  Advertise one based on the address family of the
6378  * clientaddr.
6379  */
6380 static unsigned int
6381 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len)
6382 {
6383     if (strchr(clp->cl_ipaddr, ':') != NULL)
6384         return scnprintf(buf, len, "tcp6");
6385     else
6386         return scnprintf(buf, len, "tcp");
6387 }
6388 
6389 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata)
6390 {
6391     struct nfs4_setclientid *sc = calldata;
6392 
6393     if (task->tk_status == 0)
6394         sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred);
6395 }
6396 
6397 static const struct rpc_call_ops nfs4_setclientid_ops = {
6398     .rpc_call_done = nfs4_setclientid_done,
6399 };
6400 
6401 /**
6402  * nfs4_proc_setclientid - Negotiate client ID
6403  * @clp: state data structure
6404  * @program: RPC program for NFSv4 callback service
6405  * @port: IP port number for NFS4 callback service
6406  * @cred: credential to use for this call
6407  * @res: where to place the result
6408  *
6409  * Returns zero, a negative errno, or a negative NFS4ERR status code.
6410  */
6411 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
6412         unsigned short port, const struct cred *cred,
6413         struct nfs4_setclientid_res *res)
6414 {
6415     nfs4_verifier sc_verifier;
6416     struct nfs4_setclientid setclientid = {
6417         .sc_verifier = &sc_verifier,
6418         .sc_prog = program,
6419         .sc_clnt = clp,
6420     };
6421     struct rpc_message msg = {
6422         .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
6423         .rpc_argp = &setclientid,
6424         .rpc_resp = res,
6425         .rpc_cred = cred,
6426     };
6427     struct rpc_task_setup task_setup_data = {
6428         .rpc_client = clp->cl_rpcclient,
6429         .rpc_message = &msg,
6430         .callback_ops = &nfs4_setclientid_ops,
6431         .callback_data = &setclientid,
6432         .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN,
6433     };
6434     unsigned long now = jiffies;
6435     int status;
6436 
6437     /* nfs_client_id4 */
6438     nfs4_init_boot_verifier(clp, &sc_verifier);
6439 
6440     if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
6441         status = nfs4_init_uniform_client_string(clp);
6442     else
6443         status = nfs4_init_nonuniform_client_string(clp);
6444 
6445     if (status)
6446         goto out;
6447 
6448     /* cb_client4 */
6449     setclientid.sc_netid_len =
6450                 nfs4_init_callback_netid(clp,
6451                         setclientid.sc_netid,
6452                         sizeof(setclientid.sc_netid));
6453     setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
6454                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
6455                 clp->cl_ipaddr, port >> 8, port & 255);
6456 
6457     dprintk("NFS call  setclientid auth=%s, '%s'\n",
6458         clp->cl_rpcclient->cl_auth->au_ops->au_name,
6459         clp->cl_owner_id);
6460 
6461     status = nfs4_call_sync_custom(&task_setup_data);
6462     if (setclientid.sc_cred) {
6463         kfree(clp->cl_acceptor);
6464         clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred);
6465         put_rpccred(setclientid.sc_cred);
6466     }
6467 
6468     if (status == 0)
6469         do_renew_lease(clp, now);
6470 out:
6471     trace_nfs4_setclientid(clp, status);
6472     dprintk("NFS reply setclientid: %d\n", status);
6473     return status;
6474 }
6475 
6476 /**
6477  * nfs4_proc_setclientid_confirm - Confirm client ID
6478  * @clp: state data structure
6479  * @arg: result of a previous SETCLIENTID
6480  * @cred: credential to use for this call
6481  *
6482  * Returns zero, a negative errno, or a negative NFS4ERR status code.
6483  */
6484 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
6485         struct nfs4_setclientid_res *arg,
6486         const struct cred *cred)
6487 {
6488     struct rpc_message msg = {
6489         .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
6490         .rpc_argp = arg,
6491         .rpc_cred = cred,
6492     };
6493     int status;
6494 
6495     dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
6496         clp->cl_rpcclient->cl_auth->au_ops->au_name,
6497         clp->cl_clientid);
6498     status = rpc_call_sync(clp->cl_rpcclient, &msg,
6499                    RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
6500     trace_nfs4_setclientid_confirm(clp, status);
6501     dprintk("NFS reply setclientid_confirm: %d\n", status);
6502     return status;
6503 }
6504 
6505 struct nfs4_delegreturndata {
6506     struct nfs4_delegreturnargs args;
6507     struct nfs4_delegreturnres res;
6508     struct nfs_fh fh;
6509     nfs4_stateid stateid;
6510     unsigned long timestamp;
6511     struct {
6512         struct nfs4_layoutreturn_args arg;
6513         struct nfs4_layoutreturn_res res;
6514         struct nfs4_xdr_opaque_data ld_private;
6515         u32 roc_barrier;
6516         bool roc;
6517     } lr;
6518     struct nfs_fattr fattr;
6519     int rpc_status;
6520     struct inode *inode;
6521 };
6522 
6523 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
6524 {
6525     struct nfs4_delegreturndata *data = calldata;
6526     struct nfs4_exception exception = {
6527         .inode = data->inode,
6528         .stateid = &data->stateid,
6529         .task_is_privileged = data->args.seq_args.sa_privileged,
6530     };
6531 
6532     if (!nfs4_sequence_done(task, &data->res.seq_res))
6533         return;
6534 
6535     trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
6536 
6537     /* Handle Layoutreturn errors */
6538     if (pnfs_roc_done(task, &data->args.lr_args, &data->res.lr_res,
6539               &data->res.lr_ret) == -EAGAIN)
6540         goto out_restart;
6541 
6542     switch (task->tk_status) {
6543     case 0:
6544         renew_lease(data->res.server, data->timestamp);
6545         break;
6546     case -NFS4ERR_ADMIN_REVOKED:
6547     case -NFS4ERR_DELEG_REVOKED:
6548     case -NFS4ERR_EXPIRED:
6549         nfs4_free_revoked_stateid(data->res.server,
6550                 data->args.stateid,
6551                 task->tk_msg.rpc_cred);
6552         fallthrough;
6553     case -NFS4ERR_BAD_STATEID:
6554     case -NFS4ERR_STALE_STATEID:
6555     case -ETIMEDOUT:
6556         task->tk_status = 0;
6557         break;
6558     case -NFS4ERR_OLD_STATEID:
6559         if (!nfs4_refresh_delegation_stateid(&data->stateid, data->inode))
6560             nfs4_stateid_seqid_inc(&data->stateid);
6561         if (data->args.bitmask) {
6562             data->args.bitmask = NULL;
6563             data->res.fattr = NULL;
6564         }
6565         goto out_restart;
6566     case -NFS4ERR_ACCESS:
6567         if (data->args.bitmask) {
6568             data->args.bitmask = NULL;
6569             data->res.fattr = NULL;
6570             goto out_restart;
6571         }
6572         fallthrough;
6573     default:
6574         task->tk_status = nfs4_async_handle_exception(task,
6575                 data->res.server, task->tk_status,
6576                 &exception);
6577         if (exception.retry)
6578             goto out_restart;
6579     }
6580     nfs_delegation_mark_returned(data->inode, data->args.stateid);
6581     data->rpc_status = task->tk_status;
6582     return;
6583 out_restart:
6584     task->tk_status = 0;
6585     rpc_restart_call_prepare(task);
6586 }
6587 
6588 static void nfs4_delegreturn_release(void *calldata)
6589 {
6590     struct nfs4_delegreturndata *data = calldata;
6591     struct inode *inode = data->inode;
6592 
6593     if (data->lr.roc)
6594         pnfs_roc_release(&data->lr.arg, &data->lr.res,
6595                  data->res.lr_ret);
6596     if (inode) {
6597         nfs4_fattr_set_prechange(&data->fattr,
6598                      inode_peek_iversion_raw(inode));
6599         nfs_refresh_inode(inode, &data->fattr);
6600         nfs_iput_and_deactive(inode);
6601     }
6602     kfree(calldata);
6603 }
6604 
6605 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
6606 {
6607     struct nfs4_delegreturndata *d_data;
6608     struct pnfs_layout_hdr *lo;
6609 
6610     d_data = (struct nfs4_delegreturndata *)data;
6611 
6612     if (!d_data->lr.roc && nfs4_wait_on_layoutreturn(d_data->inode, task)) {
6613         nfs4_sequence_done(task, &d_data->res.seq_res);
6614         return;
6615     }
6616 
6617     lo = d_data->args.lr_args ? d_data->args.lr_args->layout : NULL;
6618     if (lo && !pnfs_layout_is_valid(lo)) {
6619         d_data->args.lr_args = NULL;
6620         d_data->res.lr_res = NULL;
6621     }
6622 
6623     nfs4_setup_sequence(d_data->res.server->nfs_client,
6624             &d_data->args.seq_args,
6625             &d_data->res.seq_res,
6626             task);
6627 }
6628 
6629 static const struct rpc_call_ops nfs4_delegreturn_ops = {
6630     .rpc_call_prepare = nfs4_delegreturn_prepare,
6631     .rpc_call_done = nfs4_delegreturn_done,
6632     .rpc_release = nfs4_delegreturn_release,
6633 };
6634 
6635 static int _nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync)
6636 {
6637     struct nfs4_delegreturndata *data;
6638     struct nfs_server *server = NFS_SERVER(inode);
6639     struct rpc_task *task;
6640     struct rpc_message msg = {
6641         .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
6642         .rpc_cred = cred,
6643     };
6644     struct rpc_task_setup task_setup_data = {
6645         .rpc_client = server->client,
6646         .rpc_message = &msg,
6647         .callback_ops = &nfs4_delegreturn_ops,
6648         .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
6649     };
6650     int status = 0;
6651 
6652     if (nfs_server_capable(inode, NFS_CAP_MOVEABLE))
6653         task_setup_data.flags |= RPC_TASK_MOVEABLE;
6654 
6655     data = kzalloc(sizeof(*data), GFP_KERNEL);
6656     if (data == NULL)
6657         return -ENOMEM;
6658 
6659     nfs4_state_protect(server->nfs_client,
6660             NFS_SP4_MACH_CRED_CLEANUP,
6661             &task_setup_data.rpc_client, &msg);
6662 
6663     data->args.fhandle = &data->fh;
6664     data->args.stateid = &data->stateid;
6665     nfs4_bitmask_set(data->args.bitmask_store,
6666              server->cache_consistency_bitmask, inode, 0);
6667     data->args.bitmask = data->args.bitmask_store;
6668     nfs_copy_fh(&data->fh, NFS_FH(inode));
6669     nfs4_stateid_copy(&data->stateid, stateid);
6670     data->res.fattr = &data->fattr;
6671     data->res.server = server;
6672     data->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT;
6673     data->lr.arg.ld_private = &data->lr.ld_private;
6674     nfs_fattr_init(data->res.fattr);
6675     data->timestamp = jiffies;
6676     data->rpc_status = 0;
6677     data->inode = nfs_igrab_and_active(inode);
6678     if (data->inode || issync) {
6679         data->lr.roc = pnfs_roc(inode, &data->lr.arg, &data->lr.res,
6680                     cred);
6681         if (data->lr.roc) {
6682             data->args.lr_args = &data->lr.arg;
6683             data->res.lr_res = &data->lr.res;
6684         }
6685     }
6686 
6687     if (!data->inode)
6688         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1,
6689                    1);
6690     else
6691         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1,
6692                    0);
6693     task_setup_data.callback_data = data;
6694     msg.rpc_argp = &data->args;
6695     msg.rpc_resp = &data->res;
6696     task = rpc_run_task(&task_setup_data);
6697     if (IS_ERR(task))
6698         return PTR_ERR(task);
6699     if (!issync)
6700         goto out;
6701     status = rpc_wait_for_completion_task(task);
6702     if (status != 0)
6703         goto out;
6704     status = data->rpc_status;
6705 out:
6706     rpc_put_task(task);
6707     return status;
6708 }
6709 
6710 int nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync)
6711 {
6712     struct nfs_server *server = NFS_SERVER(inode);
6713     struct nfs4_exception exception = { };
6714     int err;
6715     do {
6716         err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
6717         trace_nfs4_delegreturn(inode, stateid, err);
6718         switch (err) {
6719             case -NFS4ERR_STALE_STATEID:
6720             case -NFS4ERR_EXPIRED:
6721             case 0:
6722                 return 0;
6723         }
6724         err = nfs4_handle_exception(server, err, &exception);
6725     } while (exception.retry);
6726     return err;
6727 }
6728 
6729 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6730 {
6731     struct inode *inode = state->inode;
6732     struct nfs_server *server = NFS_SERVER(inode);
6733     struct nfs_client *clp = server->nfs_client;
6734     struct nfs_lockt_args arg = {
6735         .fh = NFS_FH(inode),
6736         .fl = request,
6737     };
6738     struct nfs_lockt_res res = {
6739         .denied = request,
6740     };
6741     struct rpc_message msg = {
6742         .rpc_proc   = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
6743         .rpc_argp   = &arg,
6744         .rpc_resp   = &res,
6745         .rpc_cred   = state->owner->so_cred,
6746     };
6747     struct nfs4_lock_state *lsp;
6748     int status;
6749 
6750     arg.lock_owner.clientid = clp->cl_clientid;
6751     status = nfs4_set_lock_state(state, request);
6752     if (status != 0)
6753         goto out;
6754     lsp = request->fl_u.nfs4_fl.owner;
6755     arg.lock_owner.id = lsp->ls_seqid.owner_id;
6756     arg.lock_owner.s_dev = server->s_dev;
6757     status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
6758     switch (status) {
6759         case 0:
6760             request->fl_type = F_UNLCK;
6761             break;
6762         case -NFS4ERR_DENIED:
6763             status = 0;
6764     }
6765     request->fl_ops->fl_release_private(request);
6766     request->fl_ops = NULL;
6767 out:
6768     return status;
6769 }
6770 
6771 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6772 {
6773     struct nfs4_exception exception = {
6774         .interruptible = true,
6775     };
6776     int err;
6777 
6778     do {
6779         err = _nfs4_proc_getlk(state, cmd, request);
6780         trace_nfs4_get_lock(request, state, cmd, err);
6781         err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
6782                 &exception);
6783     } while (exception.retry);
6784     return err;
6785 }
6786 
6787 /*
6788  * Update the seqid of a lock stateid after receiving
6789  * NFS4ERR_OLD_STATEID
6790  */
6791 static bool nfs4_refresh_lock_old_stateid(nfs4_stateid *dst,
6792         struct nfs4_lock_state *lsp)
6793 {
6794     struct nfs4_state *state = lsp->ls_state;
6795     bool ret = false;
6796 
6797     spin_lock(&state->state_lock);
6798     if (!nfs4_stateid_match_other(dst, &lsp->ls_stateid))
6799         goto out;
6800     if (!nfs4_stateid_is_newer(&lsp->ls_stateid, dst))
6801         nfs4_stateid_seqid_inc(dst);
6802     else
6803         dst->seqid = lsp->ls_stateid.seqid;
6804     ret = true;
6805 out:
6806     spin_unlock(&state->state_lock);
6807     return ret;
6808 }
6809 
6810 static bool nfs4_sync_lock_stateid(nfs4_stateid *dst,
6811         struct nfs4_lock_state *lsp)
6812 {
6813     struct nfs4_state *state = lsp->ls_state;
6814     bool ret;
6815 
6816     spin_lock(&state->state_lock);
6817     ret = !nfs4_stateid_match_other(dst, &lsp->ls_stateid);
6818     nfs4_stateid_copy(dst, &lsp->ls_stateid);
6819     spin_unlock(&state->state_lock);
6820     return ret;
6821 }
6822 
6823 struct nfs4_unlockdata {
6824     struct nfs_locku_args arg;
6825     struct nfs_locku_res res;
6826     struct nfs4_lock_state *lsp;
6827     struct nfs_open_context *ctx;
6828     struct nfs_lock_context *l_ctx;
6829     struct file_lock fl;
6830     struct nfs_server *server;
6831     unsigned long timestamp;
6832 };
6833 
6834 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
6835         struct nfs_open_context *ctx,
6836         struct nfs4_lock_state *lsp,
6837         struct nfs_seqid *seqid)
6838 {
6839     struct nfs4_unlockdata *p;
6840     struct nfs4_state *state = lsp->ls_state;
6841     struct inode *inode = state->inode;
6842 
6843     p = kzalloc(sizeof(*p), GFP_KERNEL);
6844     if (p == NULL)
6845         return NULL;
6846     p->arg.fh = NFS_FH(inode);
6847     p->arg.fl = &p->fl;
6848     p->arg.seqid = seqid;
6849     p->res.seqid = seqid;
6850     p->lsp = lsp;
6851     /* Ensure we don't close file until we're done freeing locks! */
6852     p->ctx = get_nfs_open_context(ctx);
6853     p->l_ctx = nfs_get_lock_context(ctx);
6854     locks_init_lock(&p->fl);
6855     locks_copy_lock(&p->fl, fl);
6856     p->server = NFS_SERVER(inode);
6857     spin_lock(&state->state_lock);
6858     nfs4_stateid_copy(&p->arg.stateid, &lsp->ls_stateid);
6859     spin_unlock(&state->state_lock);
6860     return p;
6861 }
6862 
6863 static void nfs4_locku_release_calldata(void *data)
6864 {
6865     struct nfs4_unlockdata *calldata = data;
6866     nfs_free_seqid(calldata->arg.seqid);
6867     nfs4_put_lock_state(calldata->lsp);
6868     nfs_put_lock_context(calldata->l_ctx);
6869     put_nfs_open_context(calldata->ctx);
6870     kfree(calldata);
6871 }
6872 
6873 static void nfs4_locku_done(struct rpc_task *task, void *data)
6874 {
6875     struct nfs4_unlockdata *calldata = data;
6876     struct nfs4_exception exception = {
6877         .inode = calldata->lsp->ls_state->inode,
6878         .stateid = &calldata->arg.stateid,
6879     };
6880 
6881     if (!nfs4_sequence_done(task, &calldata->res.seq_res))
6882         return;
6883     switch (task->tk_status) {
6884         case 0:
6885             renew_lease(calldata->server, calldata->timestamp);
6886             locks_lock_inode_wait(calldata->lsp->ls_state->inode, &calldata->fl);
6887             if (nfs4_update_lock_stateid(calldata->lsp,
6888                     &calldata->res.stateid))
6889                 break;
6890             fallthrough;
6891         case -NFS4ERR_ADMIN_REVOKED:
6892         case -NFS4ERR_EXPIRED:
6893             nfs4_free_revoked_stateid(calldata->server,
6894                     &calldata->arg.stateid,
6895                     task->tk_msg.rpc_cred);
6896             fallthrough;
6897         case -NFS4ERR_BAD_STATEID:
6898         case -NFS4ERR_STALE_STATEID:
6899             if (nfs4_sync_lock_stateid(&calldata->arg.stateid,
6900                         calldata->lsp))
6901                 rpc_restart_call_prepare(task);
6902             break;
6903         case -NFS4ERR_OLD_STATEID:
6904             if (nfs4_refresh_lock_old_stateid(&calldata->arg.stateid,
6905                         calldata->lsp))
6906                 rpc_restart_call_prepare(task);
6907             break;
6908         default:
6909             task->tk_status = nfs4_async_handle_exception(task,
6910                     calldata->server, task->tk_status,
6911                     &exception);
6912             if (exception.retry)
6913                 rpc_restart_call_prepare(task);
6914     }
6915     nfs_release_seqid(calldata->arg.seqid);
6916 }
6917 
6918 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
6919 {
6920     struct nfs4_unlockdata *calldata = data;
6921 
6922     if (test_bit(NFS_CONTEXT_UNLOCK, &calldata->l_ctx->open_context->flags) &&
6923         nfs_async_iocounter_wait(task, calldata->l_ctx))
6924         return;
6925 
6926     if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
6927         goto out_wait;
6928     if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
6929         /* Note: exit _without_ running nfs4_locku_done */
6930         goto out_no_action;
6931     }
6932     calldata->timestamp = jiffies;
6933     if (nfs4_setup_sequence(calldata->server->nfs_client,
6934                 &calldata->arg.seq_args,
6935                 &calldata->res.seq_res,
6936                 task) != 0)
6937         nfs_release_seqid(calldata->arg.seqid);
6938     return;
6939 out_no_action:
6940     task->tk_action = NULL;
6941 out_wait:
6942     nfs4_sequence_done(task, &calldata->res.seq_res);
6943 }
6944 
6945 static const struct rpc_call_ops nfs4_locku_ops = {
6946     .rpc_call_prepare = nfs4_locku_prepare,
6947     .rpc_call_done = nfs4_locku_done,
6948     .rpc_release = nfs4_locku_release_calldata,
6949 };
6950 
6951 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
6952         struct nfs_open_context *ctx,
6953         struct nfs4_lock_state *lsp,
6954         struct nfs_seqid *seqid)
6955 {
6956     struct nfs4_unlockdata *data;
6957     struct rpc_message msg = {
6958         .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
6959         .rpc_cred = ctx->cred,
6960     };
6961     struct rpc_task_setup task_setup_data = {
6962         .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
6963         .rpc_message = &msg,
6964         .callback_ops = &nfs4_locku_ops,
6965         .workqueue = nfsiod_workqueue,
6966         .flags = RPC_TASK_ASYNC,
6967     };
6968 
6969     if (nfs_server_capable(lsp->ls_state->inode, NFS_CAP_MOVEABLE))
6970         task_setup_data.flags |= RPC_TASK_MOVEABLE;
6971 
6972     nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client,
6973         NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg);
6974 
6975     /* Ensure this is an unlock - when canceling a lock, the
6976      * canceled lock is passed in, and it won't be an unlock.
6977      */
6978     fl->fl_type = F_UNLCK;
6979     if (fl->fl_flags & FL_CLOSE)
6980         set_bit(NFS_CONTEXT_UNLOCK, &ctx->flags);
6981 
6982     data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
6983     if (data == NULL) {
6984         nfs_free_seqid(seqid);
6985         return ERR_PTR(-ENOMEM);
6986     }
6987 
6988     nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1, 0);
6989     msg.rpc_argp = &data->arg;
6990     msg.rpc_resp = &data->res;
6991     task_setup_data.callback_data = data;
6992     return rpc_run_task(&task_setup_data);
6993 }
6994 
6995 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
6996 {
6997     struct inode *inode = state->inode;
6998     struct nfs4_state_owner *sp = state->owner;
6999     struct nfs_inode *nfsi = NFS_I(inode);
7000     struct nfs_seqid *seqid;
7001     struct nfs4_lock_state *lsp;
7002     struct rpc_task *task;
7003     struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
7004     int status = 0;
7005     unsigned char fl_flags = request->fl_flags;
7006 
7007     status = nfs4_set_lock_state(state, request);
7008     /* Unlock _before_ we do the RPC call */
7009     request->fl_flags |= FL_EXISTS;
7010     /* Exclude nfs_delegation_claim_locks() */
7011     mutex_lock(&sp->so_delegreturn_mutex);
7012     /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
7013     down_read(&nfsi->rwsem);
7014     if (locks_lock_inode_wait(inode, request) == -ENOENT) {
7015         up_read(&nfsi->rwsem);
7016         mutex_unlock(&sp->so_delegreturn_mutex);
7017         goto out;
7018     }
7019     up_read(&nfsi->rwsem);
7020     mutex_unlock(&sp->so_delegreturn_mutex);
7021     if (status != 0)
7022         goto out;
7023     /* Is this a delegated lock? */
7024     lsp = request->fl_u.nfs4_fl.owner;
7025     if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
7026         goto out;
7027     alloc_seqid = NFS_SERVER(inode)->nfs_client->cl_mvops->alloc_seqid;
7028     seqid = alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
7029     status = -ENOMEM;
7030     if (IS_ERR(seqid))
7031         goto out;
7032     task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
7033     status = PTR_ERR(task);
7034     if (IS_ERR(task))
7035         goto out;
7036     status = rpc_wait_for_completion_task(task);
7037     rpc_put_task(task);
7038 out:
7039     request->fl_flags = fl_flags;
7040     trace_nfs4_unlock(request, state, F_SETLK, status);
7041     return status;
7042 }
7043 
7044 struct nfs4_lockdata {
7045     struct nfs_lock_args arg;
7046     struct nfs_lock_res res;
7047     struct nfs4_lock_state *lsp;
7048     struct nfs_open_context *ctx;
7049     struct file_lock fl;
7050     unsigned long timestamp;
7051     int rpc_status;
7052     int cancelled;
7053     struct nfs_server *server;
7054 };
7055 
7056 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
7057         struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
7058         gfp_t gfp_mask)
7059 {
7060     struct nfs4_lockdata *p;
7061     struct inode *inode = lsp->ls_state->inode;
7062     struct nfs_server *server = NFS_SERVER(inode);
7063     struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
7064 
7065     p = kzalloc(sizeof(*p), gfp_mask);
7066     if (p == NULL)
7067         return NULL;
7068 
7069     p->arg.fh = NFS_FH(inode);
7070     p->arg.fl = &p->fl;
7071     p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
7072     if (IS_ERR(p->arg.open_seqid))
7073         goto out_free;
7074     alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
7075     p->arg.lock_seqid = alloc_seqid(&lsp->ls_seqid, gfp_mask);
7076     if (IS_ERR(p->arg.lock_seqid))
7077         goto out_free_seqid;
7078     p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
7079     p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
7080     p->arg.lock_owner.s_dev = server->s_dev;
7081     p->res.lock_seqid = p->arg.lock_seqid;
7082     p->lsp = lsp;
7083     p->server = server;
7084     p->ctx = get_nfs_open_context(ctx);
7085     locks_init_lock(&p->fl);
7086     locks_copy_lock(&p->fl, fl);
7087     return p;
7088 out_free_seqid:
7089     nfs_free_seqid(p->arg.open_seqid);
7090 out_free:
7091     kfree(p);
7092     return NULL;
7093 }
7094 
7095 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
7096 {
7097     struct nfs4_lockdata *data = calldata;
7098     struct nfs4_state *state = data->lsp->ls_state;
7099 
7100     if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
7101         goto out_wait;
7102     /* Do we need to do an open_to_lock_owner? */
7103     if (!test_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags)) {
7104         if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
7105             goto out_release_lock_seqid;
7106         }
7107         nfs4_stateid_copy(&data->arg.open_stateid,
7108                 &state->open_stateid);
7109         data->arg.new_lock_owner = 1;
7110         data->res.open_seqid = data->arg.open_seqid;
7111     } else {
7112         data->arg.new_lock_owner = 0;
7113         nfs4_stateid_copy(&data->arg.lock_stateid,
7114                 &data->lsp->ls_stateid);
7115     }
7116     if (!nfs4_valid_open_stateid(state)) {
7117         data->rpc_status = -EBADF;
7118         task->tk_action = NULL;
7119         goto out_release_open_seqid;
7120     }
7121     data->timestamp = jiffies;
7122     if (nfs4_setup_sequence(data->server->nfs_client,
7123                 &data->arg.seq_args,
7124                 &data->res.seq_res,
7125                 task) == 0)
7126         return;
7127 out_release_open_seqid:
7128     nfs_release_seqid(data->arg.open_seqid);
7129 out_release_lock_seqid:
7130     nfs_release_seqid(data->arg.lock_seqid);
7131 out_wait:
7132     nfs4_sequence_done(task, &data->res.seq_res);
7133     dprintk("%s: ret = %d\n", __func__, data->rpc_status);
7134 }
7135 
7136 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
7137 {
7138     struct nfs4_lockdata *data = calldata;
7139     struct nfs4_lock_state *lsp = data->lsp;
7140 
7141     if (!nfs4_sequence_done(task, &data->res.seq_res))
7142         return;
7143 
7144     data->rpc_status = task->tk_status;
7145     switch (task->tk_status) {
7146     case 0:
7147         renew_lease(NFS_SERVER(d_inode(data->ctx->dentry)),
7148                 data->timestamp);
7149         if (data->arg.new_lock && !data->cancelled) {
7150             data->fl.fl_flags &= ~(FL_SLEEP | FL_ACCESS);
7151             if (locks_lock_inode_wait(lsp->ls_state->inode, &data->fl) < 0)
7152                 goto out_restart;
7153         }
7154         if (data->arg.new_lock_owner != 0) {
7155             nfs_confirm_seqid(&lsp->ls_seqid, 0);
7156             nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid);
7157             set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
7158         } else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid))
7159             goto out_restart;
7160         break;
7161     case -NFS4ERR_BAD_STATEID:
7162     case -NFS4ERR_OLD_STATEID:
7163     case -NFS4ERR_STALE_STATEID:
7164     case -NFS4ERR_EXPIRED:
7165         if (data->arg.new_lock_owner != 0) {
7166             if (!nfs4_stateid_match(&data->arg.open_stateid,
7167                         &lsp->ls_state->open_stateid))
7168                 goto out_restart;
7169         } else if (!nfs4_stateid_match(&data->arg.lock_stateid,
7170                         &lsp->ls_stateid))
7171                 goto out_restart;
7172     }
7173 out_done:
7174     dprintk("%s: ret = %d!\n", __func__, data->rpc_status);
7175     return;
7176 out_restart:
7177     if (!data->cancelled)
7178         rpc_restart_call_prepare(task);
7179     goto out_done;
7180 }
7181 
7182 static void nfs4_lock_release(void *calldata)
7183 {
7184     struct nfs4_lockdata *data = calldata;
7185 
7186     nfs_free_seqid(data->arg.open_seqid);
7187     if (data->cancelled && data->rpc_status == 0) {
7188         struct rpc_task *task;
7189         task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
7190                 data->arg.lock_seqid);
7191         if (!IS_ERR(task))
7192             rpc_put_task_async(task);
7193         dprintk("%s: cancelling lock!\n", __func__);
7194     } else
7195         nfs_free_seqid(data->arg.lock_seqid);
7196     nfs4_put_lock_state(data->lsp);
7197     put_nfs_open_context(data->ctx);
7198     kfree(data);
7199 }
7200 
7201 static const struct rpc_call_ops nfs4_lock_ops = {
7202     .rpc_call_prepare = nfs4_lock_prepare,
7203     .rpc_call_done = nfs4_lock_done,
7204     .rpc_release = nfs4_lock_release,
7205 };
7206 
7207 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
7208 {
7209     switch (error) {
7210     case -NFS4ERR_ADMIN_REVOKED:
7211     case -NFS4ERR_EXPIRED:
7212     case -NFS4ERR_BAD_STATEID:
7213         lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
7214         if (new_lock_owner != 0 ||
7215            test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
7216             nfs4_schedule_stateid_recovery(server, lsp->ls_state);
7217         break;
7218     case -NFS4ERR_STALE_STATEID:
7219         lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
7220         nfs4_schedule_lease_recovery(server->nfs_client);
7221     }
7222 }
7223 
7224 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
7225 {
7226     struct nfs4_lockdata *data;
7227     struct rpc_task *task;
7228     struct rpc_message msg = {
7229         .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
7230         .rpc_cred = state->owner->so_cred,
7231     };
7232     struct rpc_task_setup task_setup_data = {
7233         .rpc_client = NFS_CLIENT(state->inode),
7234         .rpc_message = &msg,
7235         .callback_ops = &nfs4_lock_ops,
7236         .workqueue = nfsiod_workqueue,
7237         .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
7238     };
7239     int ret;
7240 
7241     if (nfs_server_capable(state->inode, NFS_CAP_MOVEABLE))
7242         task_setup_data.flags |= RPC_TASK_MOVEABLE;
7243 
7244     data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
7245                    fl->fl_u.nfs4_fl.owner, GFP_KERNEL);
7246     if (data == NULL)
7247         return -ENOMEM;
7248     if (IS_SETLKW(cmd))
7249         data->arg.block = 1;
7250     nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1,
7251                 recovery_type > NFS_LOCK_NEW);
7252     msg.rpc_argp = &data->arg;
7253     msg.rpc_resp = &data->res;
7254     task_setup_data.callback_data = data;
7255     if (recovery_type > NFS_LOCK_NEW) {
7256         if (recovery_type == NFS_LOCK_RECLAIM)
7257             data->arg.reclaim = NFS_LOCK_RECLAIM;
7258     } else
7259         data->arg.new_lock = 1;
7260     task = rpc_run_task(&task_setup_data);
7261     if (IS_ERR(task))
7262         return PTR_ERR(task);
7263     ret = rpc_wait_for_completion_task(task);
7264     if (ret == 0) {
7265         ret = data->rpc_status;
7266         if (ret)
7267             nfs4_handle_setlk_error(data->server, data->lsp,
7268                     data->arg.new_lock_owner, ret);
7269     } else
7270         data->cancelled = true;
7271     trace_nfs4_set_lock(fl, state, &data->res.stateid, cmd, ret);
7272     rpc_put_task(task);
7273     dprintk("%s: ret = %d\n", __func__, ret);
7274     return ret;
7275 }
7276 
7277 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
7278 {
7279     struct nfs_server *server = NFS_SERVER(state->inode);
7280     struct nfs4_exception exception = {
7281         .inode = state->inode,
7282     };
7283     int err;
7284 
7285     do {
7286         /* Cache the lock if possible... */
7287         if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
7288             return 0;
7289         err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
7290         if (err != -NFS4ERR_DELAY)
7291             break;
7292         nfs4_handle_exception(server, err, &exception);
7293     } while (exception.retry);
7294     return err;
7295 }
7296 
7297 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
7298 {
7299     struct nfs_server *server = NFS_SERVER(state->inode);
7300     struct nfs4_exception exception = {
7301         .inode = state->inode,
7302     };
7303     int err;
7304 
7305     err = nfs4_set_lock_state(state, request);
7306     if (err != 0)
7307         return err;
7308     if (!recover_lost_locks) {
7309         set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
7310         return 0;
7311     }
7312     do {
7313         if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
7314             return 0;
7315         err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
7316         switch (err) {
7317         default:
7318             goto out;
7319         case -NFS4ERR_GRACE:
7320         case -NFS4ERR_DELAY:
7321             nfs4_handle_exception(server, err, &exception);
7322             err = 0;
7323         }
7324     } while (exception.retry);
7325 out:
7326     return err;
7327 }
7328 
7329 #if defined(CONFIG_NFS_V4_1)
7330 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
7331 {
7332     struct nfs4_lock_state *lsp;
7333     int status;
7334 
7335     status = nfs4_set_lock_state(state, request);
7336     if (status != 0)
7337         return status;
7338     lsp = request->fl_u.nfs4_fl.owner;
7339     if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) ||
7340         test_bit(NFS_LOCK_LOST, &lsp->ls_flags))
7341         return 0;
7342     return nfs4_lock_expired(state, request);
7343 }
7344 #endif
7345 
7346 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7347 {
7348     struct nfs_inode *nfsi = NFS_I(state->inode);
7349     struct nfs4_state_owner *sp = state->owner;
7350     unsigned char fl_flags = request->fl_flags;
7351     int status;
7352 
7353     request->fl_flags |= FL_ACCESS;
7354     status = locks_lock_inode_wait(state->inode, request);
7355     if (status < 0)
7356         goto out;
7357     mutex_lock(&sp->so_delegreturn_mutex);
7358     down_read(&nfsi->rwsem);
7359     if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
7360         /* Yes: cache locks! */
7361         /* ...but avoid races with delegation recall... */
7362         request->fl_flags = fl_flags & ~FL_SLEEP;
7363         status = locks_lock_inode_wait(state->inode, request);
7364         up_read(&nfsi->rwsem);
7365         mutex_unlock(&sp->so_delegreturn_mutex);
7366         goto out;
7367     }
7368     up_read(&nfsi->rwsem);
7369     mutex_unlock(&sp->so_delegreturn_mutex);
7370     status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
7371 out:
7372     request->fl_flags = fl_flags;
7373     return status;
7374 }
7375 
7376 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7377 {
7378     struct nfs4_exception exception = {
7379         .state = state,
7380         .inode = state->inode,
7381         .interruptible = true,
7382     };
7383     int err;
7384 
7385     do {
7386         err = _nfs4_proc_setlk(state, cmd, request);
7387         if (err == -NFS4ERR_DENIED)
7388             err = -EAGAIN;
7389         err = nfs4_handle_exception(NFS_SERVER(state->inode),
7390                 err, &exception);
7391     } while (exception.retry);
7392     return err;
7393 }
7394 
7395 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
7396 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
7397 
7398 static int
7399 nfs4_retry_setlk_simple(struct nfs4_state *state, int cmd,
7400             struct file_lock *request)
7401 {
7402     int     status = -ERESTARTSYS;
7403     unsigned long   timeout = NFS4_LOCK_MINTIMEOUT;
7404 
7405     while(!signalled()) {
7406         status = nfs4_proc_setlk(state, cmd, request);
7407         if ((status != -EAGAIN) || IS_SETLK(cmd))
7408             break;
7409         freezable_schedule_timeout_interruptible(timeout);
7410         timeout *= 2;
7411         timeout = min_t(unsigned long, NFS4_LOCK_MAXTIMEOUT, timeout);
7412         status = -ERESTARTSYS;
7413     }
7414     return status;
7415 }
7416 
7417 #ifdef CONFIG_NFS_V4_1
7418 struct nfs4_lock_waiter {
7419     struct inode        *inode;
7420     struct nfs_lowner   owner;
7421     wait_queue_entry_t  wait;
7422 };
7423 
7424 static int
7425 nfs4_wake_lock_waiter(wait_queue_entry_t *wait, unsigned int mode, int flags, void *key)
7426 {
7427     struct nfs4_lock_waiter *waiter =
7428         container_of(wait, struct nfs4_lock_waiter, wait);
7429 
7430     /* NULL key means to wake up everyone */
7431     if (key) {
7432         struct cb_notify_lock_args  *cbnl = key;
7433         struct nfs_lowner       *lowner = &cbnl->cbnl_owner,
7434                         *wowner = &waiter->owner;
7435 
7436         /* Only wake if the callback was for the same owner. */
7437         if (lowner->id != wowner->id || lowner->s_dev != wowner->s_dev)
7438             return 0;
7439 
7440         /* Make sure it's for the right inode */
7441         if (nfs_compare_fh(NFS_FH(waiter->inode), &cbnl->cbnl_fh))
7442             return 0;
7443     }
7444 
7445     return woken_wake_function(wait, mode, flags, key);
7446 }
7447 
7448 static int
7449 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7450 {
7451     struct nfs4_lock_state *lsp = request->fl_u.nfs4_fl.owner;
7452     struct nfs_server *server = NFS_SERVER(state->inode);
7453     struct nfs_client *clp = server->nfs_client;
7454     wait_queue_head_t *q = &clp->cl_lock_waitq;
7455     struct nfs4_lock_waiter waiter = {
7456         .inode = state->inode,
7457         .owner = { .clientid = clp->cl_clientid,
7458                .id = lsp->ls_seqid.owner_id,
7459                .s_dev = server->s_dev },
7460     };
7461     int status;
7462 
7463     /* Don't bother with waitqueue if we don't expect a callback */
7464     if (!test_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags))
7465         return nfs4_retry_setlk_simple(state, cmd, request);
7466 
7467     init_wait(&waiter.wait);
7468     waiter.wait.func = nfs4_wake_lock_waiter;
7469     add_wait_queue(q, &waiter.wait);
7470 
7471     do {
7472         status = nfs4_proc_setlk(state, cmd, request);
7473         if (status != -EAGAIN || IS_SETLK(cmd))
7474             break;
7475 
7476         status = -ERESTARTSYS;
7477         freezer_do_not_count();
7478         wait_woken(&waiter.wait, TASK_INTERRUPTIBLE,
7479                NFS4_LOCK_MAXTIMEOUT);
7480         freezer_count();
7481     } while (!signalled());
7482 
7483     remove_wait_queue(q, &waiter.wait);
7484 
7485     return status;
7486 }
7487 #else /* !CONFIG_NFS_V4_1 */
7488 static inline int
7489 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7490 {
7491     return nfs4_retry_setlk_simple(state, cmd, request);
7492 }
7493 #endif
7494 
7495 static int
7496 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
7497 {
7498     struct nfs_open_context *ctx;
7499     struct nfs4_state *state;
7500     int status;
7501 
7502     /* verify open state */
7503     ctx = nfs_file_open_context(filp);
7504     state = ctx->state;
7505 
7506     if (IS_GETLK(cmd)) {
7507         if (state != NULL)
7508             return nfs4_proc_getlk(state, F_GETLK, request);
7509         return 0;
7510     }
7511 
7512     if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
7513         return -EINVAL;
7514 
7515     if (request->fl_type == F_UNLCK) {
7516         if (state != NULL)
7517             return nfs4_proc_unlck(state, cmd, request);
7518         return 0;
7519     }
7520 
7521     if (state == NULL)
7522         return -ENOLCK;
7523 
7524     if ((request->fl_flags & FL_POSIX) &&
7525         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
7526         return -ENOLCK;
7527 
7528     /*
7529      * Don't rely on the VFS having checked the file open mode,
7530      * since it won't do this for flock() locks.
7531      */
7532     switch (request->fl_type) {
7533     case F_RDLCK:
7534         if (!(filp->f_mode & FMODE_READ))
7535             return -EBADF;
7536         break;
7537     case F_WRLCK:
7538         if (!(filp->f_mode & FMODE_WRITE))
7539             return -EBADF;
7540     }
7541 
7542     status = nfs4_set_lock_state(state, request);
7543     if (status != 0)
7544         return status;
7545 
7546     return nfs4_retry_setlk(state, cmd, request);
7547 }
7548 
7549 static int nfs4_delete_lease(struct file *file, void **priv)
7550 {
7551     return generic_setlease(file, F_UNLCK, NULL, priv);
7552 }
7553 
7554 static int nfs4_add_lease(struct file *file, long arg, struct file_lock **lease,
7555               void **priv)
7556 {
7557     struct inode *inode = file_inode(file);
7558     fmode_t type = arg == F_RDLCK ? FMODE_READ : FMODE_WRITE;
7559     int ret;
7560 
7561     /* No delegation, no lease */
7562     if (!nfs4_have_delegation(inode, type))
7563         return -EAGAIN;
7564     ret = generic_setlease(file, arg, lease, priv);
7565     if (ret || nfs4_have_delegation(inode, type))
7566         return ret;
7567     /* We raced with a delegation return */
7568     nfs4_delete_lease(file, priv);
7569     return -EAGAIN;
7570 }
7571 
7572 int nfs4_proc_setlease(struct file *file, long arg, struct file_lock **lease,
7573                void **priv)
7574 {
7575     switch (arg) {
7576     case F_RDLCK:
7577     case F_WRLCK:
7578         return nfs4_add_lease(file, arg, lease, priv);
7579     case F_UNLCK:
7580         return nfs4_delete_lease(file, priv);
7581     default:
7582         return -EINVAL;
7583     }
7584 }
7585 
7586 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
7587 {
7588     struct nfs_server *server = NFS_SERVER(state->inode);
7589     int err;
7590 
7591     err = nfs4_set_lock_state(state, fl);
7592     if (err != 0)
7593         return err;
7594     do {
7595         err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
7596         if (err != -NFS4ERR_DELAY)
7597             break;
7598         ssleep(1);
7599     } while (err == -NFS4ERR_DELAY);
7600     return nfs4_handle_delegation_recall_error(server, state, stateid, fl, err);
7601 }
7602 
7603 struct nfs_release_lockowner_data {
7604     struct nfs4_lock_state *lsp;
7605     struct nfs_server *server;
7606     struct nfs_release_lockowner_args args;
7607     struct nfs_release_lockowner_res res;
7608     unsigned long timestamp;
7609 };
7610 
7611 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata)
7612 {
7613     struct nfs_release_lockowner_data *data = calldata;
7614     struct nfs_server *server = data->server;
7615     nfs4_setup_sequence(server->nfs_client, &data->args.seq_args,
7616                &data->res.seq_res, task);
7617     data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
7618     data->timestamp = jiffies;
7619 }
7620 
7621 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata)
7622 {
7623     struct nfs_release_lockowner_data *data = calldata;
7624     struct nfs_server *server = data->server;
7625 
7626     nfs40_sequence_done(task, &data->res.seq_res);
7627 
7628     switch (task->tk_status) {
7629     case 0:
7630         renew_lease(server, data->timestamp);
7631         break;
7632     case -NFS4ERR_STALE_CLIENTID:
7633     case -NFS4ERR_EXPIRED:
7634         nfs4_schedule_lease_recovery(server->nfs_client);
7635         break;
7636     case -NFS4ERR_LEASE_MOVED:
7637     case -NFS4ERR_DELAY:
7638         if (nfs4_async_handle_error(task, server,
7639                         NULL, NULL) == -EAGAIN)
7640             rpc_restart_call_prepare(task);
7641     }
7642 }
7643 
7644 static void nfs4_release_lockowner_release(void *calldata)
7645 {
7646     struct nfs_release_lockowner_data *data = calldata;
7647     nfs4_free_lock_state(data->server, data->lsp);
7648     kfree(calldata);
7649 }
7650 
7651 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
7652     .rpc_call_prepare = nfs4_release_lockowner_prepare,
7653     .rpc_call_done = nfs4_release_lockowner_done,
7654     .rpc_release = nfs4_release_lockowner_release,
7655 };
7656 
7657 static void
7658 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
7659 {
7660     struct nfs_release_lockowner_data *data;
7661     struct rpc_message msg = {
7662         .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
7663     };
7664 
7665     if (server->nfs_client->cl_mvops->minor_version != 0)
7666         return;
7667 
7668     data = kmalloc(sizeof(*data), GFP_KERNEL);
7669     if (!data)
7670         return;
7671     data->lsp = lsp;
7672     data->server = server;
7673     data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
7674     data->args.lock_owner.id = lsp->ls_seqid.owner_id;
7675     data->args.lock_owner.s_dev = server->s_dev;
7676 
7677     msg.rpc_argp = &data->args;
7678     msg.rpc_resp = &data->res;
7679     nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0, 0);
7680     rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
7681 }
7682 
7683 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
7684 
7685 static int nfs4_xattr_set_nfs4_acl(const struct xattr_handler *handler,
7686                    struct user_namespace *mnt_userns,
7687                    struct dentry *unused, struct inode *inode,
7688                    const char *key, const void *buf,
7689                    size_t buflen, int flags)
7690 {
7691     return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_ACL);
7692 }
7693 
7694 static int nfs4_xattr_get_nfs4_acl(const struct xattr_handler *handler,
7695                    struct dentry *unused, struct inode *inode,
7696                    const char *key, void *buf, size_t buflen)
7697 {
7698     return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_ACL);
7699 }
7700 
7701 static bool nfs4_xattr_list_nfs4_acl(struct dentry *dentry)
7702 {
7703     return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_ACL);
7704 }
7705 
7706 #if defined(CONFIG_NFS_V4_1)
7707 #define XATTR_NAME_NFSV4_DACL "system.nfs4_dacl"
7708 
7709 static int nfs4_xattr_set_nfs4_dacl(const struct xattr_handler *handler,
7710                     struct user_namespace *mnt_userns,
7711                     struct dentry *unused, struct inode *inode,
7712                     const char *key, const void *buf,
7713                     size_t buflen, int flags)
7714 {
7715     return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_DACL);
7716 }
7717 
7718 static int nfs4_xattr_get_nfs4_dacl(const struct xattr_handler *handler,
7719                     struct dentry *unused, struct inode *inode,
7720                     const char *key, void *buf, size_t buflen)
7721 {
7722     return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_DACL);
7723 }
7724 
7725 static bool nfs4_xattr_list_nfs4_dacl(struct dentry *dentry)
7726 {
7727     return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_DACL);
7728 }
7729 
7730 #define XATTR_NAME_NFSV4_SACL "system.nfs4_sacl"
7731 
7732 static int nfs4_xattr_set_nfs4_sacl(const struct xattr_handler *handler,
7733                     struct user_namespace *mnt_userns,
7734                     struct dentry *unused, struct inode *inode,
7735                     const char *key, const void *buf,
7736                     size_t buflen, int flags)
7737 {
7738     return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_SACL);
7739 }
7740 
7741 static int nfs4_xattr_get_nfs4_sacl(const struct xattr_handler *handler,
7742                     struct dentry *unused, struct inode *inode,
7743                     const char *key, void *buf, size_t buflen)
7744 {
7745     return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_SACL);
7746 }
7747 
7748 static bool nfs4_xattr_list_nfs4_sacl(struct dentry *dentry)
7749 {
7750     return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_SACL);
7751 }
7752 
7753 #endif
7754 
7755 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
7756 
7757 static int nfs4_xattr_set_nfs4_label(const struct xattr_handler *handler,
7758                      struct user_namespace *mnt_userns,
7759                      struct dentry *unused, struct inode *inode,
7760                      const char *key, const void *buf,
7761                      size_t buflen, int flags)
7762 {
7763     if (security_ismaclabel(key))
7764         return nfs4_set_security_label(inode, buf, buflen);
7765 
7766     return -EOPNOTSUPP;
7767 }
7768 
7769 static int nfs4_xattr_get_nfs4_label(const struct xattr_handler *handler,
7770                      struct dentry *unused, struct inode *inode,
7771                      const char *key, void *buf, size_t buflen)
7772 {
7773     if (security_ismaclabel(key))
7774         return nfs4_get_security_label(inode, buf, buflen);
7775     return -EOPNOTSUPP;
7776 }
7777 
7778 static ssize_t
7779 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len)
7780 {
7781     int len = 0;
7782 
7783     if (nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) {
7784         len = security_inode_listsecurity(inode, list, list_len);
7785         if (len >= 0 && list_len && len > list_len)
7786             return -ERANGE;
7787     }
7788     return len;
7789 }
7790 
7791 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
7792     .prefix = XATTR_SECURITY_PREFIX,
7793     .get    = nfs4_xattr_get_nfs4_label,
7794     .set    = nfs4_xattr_set_nfs4_label,
7795 };
7796 
7797 #else
7798 
7799 static ssize_t
7800 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len)
7801 {
7802     return 0;
7803 }
7804 
7805 #endif
7806 
7807 #ifdef CONFIG_NFS_V4_2
7808 static int nfs4_xattr_set_nfs4_user(const struct xattr_handler *handler,
7809                     struct user_namespace *mnt_userns,
7810                     struct dentry *unused, struct inode *inode,
7811                     const char *key, const void *buf,
7812                     size_t buflen, int flags)
7813 {
7814     u32 mask;
7815     int ret;
7816 
7817     if (!nfs_server_capable(inode, NFS_CAP_XATTR))
7818         return -EOPNOTSUPP;
7819 
7820     /*
7821      * There is no mapping from the MAY_* flags to the NFS_ACCESS_XA*
7822      * flags right now. Handling of xattr operations use the normal
7823      * file read/write permissions.
7824      *
7825      * Just in case the server has other ideas (which RFC 8276 allows),
7826      * do a cached access check for the XA* flags to possibly avoid
7827      * doing an RPC and getting EACCES back.
7828      */
7829     if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) {
7830         if (!(mask & NFS_ACCESS_XAWRITE))
7831             return -EACCES;
7832     }
7833 
7834     if (buf == NULL) {
7835         ret = nfs42_proc_removexattr(inode, key);
7836         if (!ret)
7837             nfs4_xattr_cache_remove(inode, key);
7838     } else {
7839         ret = nfs42_proc_setxattr(inode, key, buf, buflen, flags);
7840         if (!ret)
7841             nfs4_xattr_cache_add(inode, key, buf, NULL, buflen);
7842     }
7843 
7844     return ret;
7845 }
7846 
7847 static int nfs4_xattr_get_nfs4_user(const struct xattr_handler *handler,
7848                     struct dentry *unused, struct inode *inode,
7849                     const char *key, void *buf, size_t buflen)
7850 {
7851     u32 mask;
7852     ssize_t ret;
7853 
7854     if (!nfs_server_capable(inode, NFS_CAP_XATTR))
7855         return -EOPNOTSUPP;
7856 
7857     if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) {
7858         if (!(mask & NFS_ACCESS_XAREAD))
7859             return -EACCES;
7860     }
7861 
7862     ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE);
7863     if (ret)
7864         return ret;
7865 
7866     ret = nfs4_xattr_cache_get(inode, key, buf, buflen);
7867     if (ret >= 0 || (ret < 0 && ret != -ENOENT))
7868         return ret;
7869 
7870     ret = nfs42_proc_getxattr(inode, key, buf, buflen);
7871 
7872     return ret;
7873 }
7874 
7875 static ssize_t
7876 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len)
7877 {
7878     u64 cookie;
7879     bool eof;
7880     ssize_t ret, size;
7881     char *buf;
7882     size_t buflen;
7883     u32 mask;
7884 
7885     if (!nfs_server_capable(inode, NFS_CAP_XATTR))
7886         return 0;
7887 
7888     if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) {
7889         if (!(mask & NFS_ACCESS_XALIST))
7890             return 0;
7891     }
7892 
7893     ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE);
7894     if (ret)
7895         return ret;
7896 
7897     ret = nfs4_xattr_cache_list(inode, list, list_len);
7898     if (ret >= 0 || (ret < 0 && ret != -ENOENT))
7899         return ret;
7900 
7901     cookie = 0;
7902     eof = false;
7903     buflen = list_len ? list_len : XATTR_LIST_MAX;
7904     buf = list_len ? list : NULL;
7905     size = 0;
7906 
7907     while (!eof) {
7908         ret = nfs42_proc_listxattrs(inode, buf, buflen,
7909             &cookie, &eof);
7910         if (ret < 0)
7911             return ret;
7912 
7913         if (list_len) {
7914             buf += ret;
7915             buflen -= ret;
7916         }
7917         size += ret;
7918     }
7919 
7920     if (list_len)
7921         nfs4_xattr_cache_set_list(inode, list, size);
7922 
7923     return size;
7924 }
7925 
7926 #else
7927 
7928 static ssize_t
7929 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len)
7930 {
7931     return 0;
7932 }
7933 #endif /* CONFIG_NFS_V4_2 */
7934 
7935 /*
7936  * nfs_fhget will use either the mounted_on_fileid or the fileid
7937  */
7938 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
7939 {
7940     if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
7941            (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
7942           (fattr->valid & NFS_ATTR_FATTR_FSID) &&
7943           (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
7944         return;
7945 
7946     fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
7947         NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
7948     fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
7949     fattr->nlink = 2;
7950 }
7951 
7952 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
7953                    const struct qstr *name,
7954                    struct nfs4_fs_locations *fs_locations,
7955                    struct page *page)
7956 {
7957     struct nfs_server *server = NFS_SERVER(dir);
7958     u32 bitmask[3];
7959     struct nfs4_fs_locations_arg args = {
7960         .dir_fh = NFS_FH(dir),
7961         .name = name,
7962         .page = page,
7963         .bitmask = bitmask,
7964     };
7965     struct nfs4_fs_locations_res res = {
7966         .fs_locations = fs_locations,
7967     };
7968     struct rpc_message msg = {
7969         .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
7970         .rpc_argp = &args,
7971         .rpc_resp = &res,
7972     };
7973     int status;
7974 
7975     dprintk("%s: start\n", __func__);
7976 
7977     bitmask[0] = nfs4_fattr_bitmap[0] | FATTR4_WORD0_FS_LOCATIONS;
7978     bitmask[1] = nfs4_fattr_bitmap[1];
7979 
7980     /* Ask for the fileid of the absent filesystem if mounted_on_fileid
7981      * is not supported */
7982     if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
7983         bitmask[0] &= ~FATTR4_WORD0_FILEID;
7984     else
7985         bitmask[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID;
7986 
7987     nfs_fattr_init(fs_locations->fattr);
7988     fs_locations->server = server;
7989     fs_locations->nlocations = 0;
7990     status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
7991     dprintk("%s: returned status = %d\n", __func__, status);
7992     return status;
7993 }
7994 
7995 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
7996                const struct qstr *name,
7997                struct nfs4_fs_locations *fs_locations,
7998                struct page *page)
7999 {
8000     struct nfs4_exception exception = {
8001         .interruptible = true,
8002     };
8003     int err;
8004     do {
8005         err = _nfs4_proc_fs_locations(client, dir, name,
8006                 fs_locations, page);
8007         trace_nfs4_get_fs_locations(dir, name, err);
8008         err = nfs4_handle_exception(NFS_SERVER(dir), err,
8009                 &exception);
8010     } while (exception.retry);
8011     return err;
8012 }
8013 
8014 /*
8015  * This operation also signals the server that this client is
8016  * performing migration recovery.  The server can stop returning
8017  * NFS4ERR_LEASE_MOVED to this client.  A RENEW operation is
8018  * appended to this compound to identify the client ID which is
8019  * performing recovery.
8020  */
8021 static int _nfs40_proc_get_locations(struct nfs_server *server,
8022                      struct nfs_fh *fhandle,
8023                      struct nfs4_fs_locations *locations,
8024                      struct page *page, const struct cred *cred)
8025 {
8026     struct rpc_clnt *clnt = server->client;
8027     u32 bitmask[2] = {
8028         [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
8029     };
8030     struct nfs4_fs_locations_arg args = {
8031         .clientid   = server->nfs_client->cl_clientid,
8032         .fh     = fhandle,
8033         .page       = page,
8034         .bitmask    = bitmask,
8035         .migration  = 1,        /* skip LOOKUP */
8036         .renew      = 1,        /* append RENEW */
8037     };
8038     struct nfs4_fs_locations_res res = {
8039         .fs_locations   = locations,
8040         .migration  = 1,
8041         .renew      = 1,
8042     };
8043     struct rpc_message msg = {
8044         .rpc_proc   = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
8045         .rpc_argp   = &args,
8046         .rpc_resp   = &res,
8047         .rpc_cred   = cred,
8048     };
8049     unsigned long now = jiffies;
8050     int status;
8051 
8052     nfs_fattr_init(locations->fattr);
8053     locations->server = server;
8054     locations->nlocations = 0;
8055 
8056     nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
8057     status = nfs4_call_sync_sequence(clnt, server, &msg,
8058                     &args.seq_args, &res.seq_res);
8059     if (status)
8060         return status;
8061 
8062     renew_lease(server, now);
8063     return 0;
8064 }
8065 
8066 #ifdef CONFIG_NFS_V4_1
8067 
8068 /*
8069  * This operation also signals the server that this client is
8070  * performing migration recovery.  The server can stop asserting
8071  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID
8072  * performing this operation is identified in the SEQUENCE
8073  * operation in this compound.
8074  *
8075  * When the client supports GETATTR(fs_locations_info), it can
8076  * be plumbed in here.
8077  */
8078 static int _nfs41_proc_get_locations(struct nfs_server *server,
8079                      struct nfs_fh *fhandle,
8080                      struct nfs4_fs_locations *locations,
8081                      struct page *page, const struct cred *cred)
8082 {
8083     struct rpc_clnt *clnt = server->client;
8084     u32 bitmask[2] = {
8085         [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
8086     };
8087     struct nfs4_fs_locations_arg args = {
8088         .fh     = fhandle,
8089         .page       = page,
8090         .bitmask    = bitmask,
8091         .migration  = 1,        /* skip LOOKUP */
8092     };
8093     struct nfs4_fs_locations_res res = {
8094         .fs_locations   = locations,
8095         .migration  = 1,
8096     };
8097     struct rpc_message msg = {
8098         .rpc_proc   = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
8099         .rpc_argp   = &args,
8100         .rpc_resp   = &res,
8101         .rpc_cred   = cred,
8102     };
8103     struct nfs4_call_sync_data data = {
8104         .seq_server = server,
8105         .seq_args = &args.seq_args,
8106         .seq_res = &res.seq_res,
8107     };
8108     struct rpc_task_setup task_setup_data = {
8109         .rpc_client = clnt,
8110         .rpc_message = &msg,
8111         .callback_ops = server->nfs_client->cl_mvops->call_sync_ops,
8112         .callback_data = &data,
8113         .flags = RPC_TASK_NO_ROUND_ROBIN,
8114     };
8115     int status;
8116 
8117     nfs_fattr_init(locations->fattr);
8118     locations->server = server;
8119     locations->nlocations = 0;
8120 
8121     nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
8122     status = nfs4_call_sync_custom(&task_setup_data);
8123     if (status == NFS4_OK &&
8124         res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
8125         status = -NFS4ERR_LEASE_MOVED;
8126     return status;
8127 }
8128 
8129 #endif  /* CONFIG_NFS_V4_1 */
8130 
8131 /**
8132  * nfs4_proc_get_locations - discover locations for a migrated FSID
8133  * @server: pointer to nfs_server to process
8134  * @fhandle: pointer to the kernel NFS client file handle
8135  * @locations: result of query
8136  * @page: buffer
8137  * @cred: credential to use for this operation
8138  *
8139  * Returns NFS4_OK on success, a negative NFS4ERR status code if the
8140  * operation failed, or a negative errno if a local error occurred.
8141  *
8142  * On success, "locations" is filled in, but if the server has
8143  * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not
8144  * asserted.
8145  *
8146  * -NFS4ERR_LEASE_MOVED is returned if the server still has leases
8147  * from this client that require migration recovery.
8148  */
8149 int nfs4_proc_get_locations(struct nfs_server *server,
8150                 struct nfs_fh *fhandle,
8151                 struct nfs4_fs_locations *locations,
8152                 struct page *page, const struct cred *cred)
8153 {
8154     struct nfs_client *clp = server->nfs_client;
8155     const struct nfs4_mig_recovery_ops *ops =
8156                     clp->cl_mvops->mig_recovery_ops;
8157     struct nfs4_exception exception = {
8158         .interruptible = true,
8159     };
8160     int status;
8161 
8162     dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
8163         (unsigned long long)server->fsid.major,
8164         (unsigned long long)server->fsid.minor,
8165         clp->cl_hostname);
8166     nfs_display_fhandle(fhandle, __func__);
8167 
8168     do {
8169         status = ops->get_locations(server, fhandle, locations, page,
8170                         cred);
8171         if (status != -NFS4ERR_DELAY)
8172             break;
8173         nfs4_handle_exception(server, status, &exception);
8174     } while (exception.retry);
8175     return status;
8176 }
8177 
8178 /*
8179  * This operation also signals the server that this client is
8180  * performing "lease moved" recovery.  The server can stop
8181  * returning NFS4ERR_LEASE_MOVED to this client.  A RENEW operation
8182  * is appended to this compound to identify the client ID which is
8183  * performing recovery.
8184  */
8185 static int _nfs40_proc_fsid_present(struct inode *inode, const struct cred *cred)
8186 {
8187     struct nfs_server *server = NFS_SERVER(inode);
8188     struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
8189     struct rpc_clnt *clnt = server->client;
8190     struct nfs4_fsid_present_arg args = {
8191         .fh     = NFS_FH(inode),
8192         .clientid   = clp->cl_clientid,
8193         .renew      = 1,        /* append RENEW */
8194     };
8195     struct nfs4_fsid_present_res res = {
8196         .renew      = 1,
8197     };
8198     struct rpc_message msg = {
8199         .rpc_proc   = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
8200         .rpc_argp   = &args,
8201         .rpc_resp   = &res,
8202         .rpc_cred   = cred,
8203     };
8204     unsigned long now = jiffies;
8205     int status;
8206 
8207     res.fh = nfs_alloc_fhandle();
8208     if (res.fh == NULL)
8209         return -ENOMEM;
8210 
8211     nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
8212     status = nfs4_call_sync_sequence(clnt, server, &msg,
8213                         &args.seq_args, &res.seq_res);
8214     nfs_free_fhandle(res.fh);
8215     if (status)
8216         return status;
8217 
8218     do_renew_lease(clp, now);
8219     return 0;
8220 }
8221 
8222 #ifdef CONFIG_NFS_V4_1
8223 
8224 /*
8225  * This operation also signals the server that this client is
8226  * performing "lease moved" recovery.  The server can stop asserting
8227  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID performing
8228  * this operation is identified in the SEQUENCE operation in this
8229  * compound.
8230  */
8231 static int _nfs41_proc_fsid_present(struct inode *inode, const struct cred *cred)
8232 {
8233     struct nfs_server *server = NFS_SERVER(inode);
8234     struct rpc_clnt *clnt = server->client;
8235     struct nfs4_fsid_present_arg args = {
8236         .fh     = NFS_FH(inode),
8237     };
8238     struct nfs4_fsid_present_res res = {
8239     };
8240     struct rpc_message msg = {
8241         .rpc_proc   = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
8242         .rpc_argp   = &args,
8243         .rpc_resp   = &res,
8244         .rpc_cred   = cred,
8245     };
8246     int status;
8247 
8248     res.fh = nfs_alloc_fhandle();
8249     if (res.fh == NULL)
8250         return -ENOMEM;
8251 
8252     nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
8253     status = nfs4_call_sync_sequence(clnt, server, &msg,
8254                         &args.seq_args, &res.seq_res);
8255     nfs_free_fhandle(res.fh);
8256     if (status == NFS4_OK &&
8257         res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
8258         status = -NFS4ERR_LEASE_MOVED;
8259     return status;
8260 }
8261 
8262 #endif  /* CONFIG_NFS_V4_1 */
8263 
8264 /**
8265  * nfs4_proc_fsid_present - Is this FSID present or absent on server?
8266  * @inode: inode on FSID to check
8267  * @cred: credential to use for this operation
8268  *
8269  * Server indicates whether the FSID is present, moved, or not
8270  * recognized.  This operation is necessary to clear a LEASE_MOVED
8271  * condition for this client ID.
8272  *
8273  * Returns NFS4_OK if the FSID is present on this server,
8274  * -NFS4ERR_MOVED if the FSID is no longer present, a negative
8275  *  NFS4ERR code if some error occurred on the server, or a
8276  *  negative errno if a local failure occurred.
8277  */
8278 int nfs4_proc_fsid_present(struct inode *inode, const struct cred *cred)
8279 {
8280     struct nfs_server *server = NFS_SERVER(inode);
8281     struct nfs_client *clp = server->nfs_client;
8282     const struct nfs4_mig_recovery_ops *ops =
8283                     clp->cl_mvops->mig_recovery_ops;
8284     struct nfs4_exception exception = {
8285         .interruptible = true,
8286     };
8287     int status;
8288 
8289     dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
8290         (unsigned long long)server->fsid.major,
8291         (unsigned long long)server->fsid.minor,
8292         clp->cl_hostname);
8293     nfs_display_fhandle(NFS_FH(inode), __func__);
8294 
8295     do {
8296         status = ops->fsid_present(inode, cred);
8297         if (status != -NFS4ERR_DELAY)
8298             break;
8299         nfs4_handle_exception(server, status, &exception);
8300     } while (exception.retry);
8301     return status;
8302 }
8303 
8304 /*
8305  * If 'use_integrity' is true and the state managment nfs_client
8306  * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
8307  * and the machine credential as per RFC3530bis and RFC5661 Security
8308  * Considerations sections. Otherwise, just use the user cred with the
8309  * filesystem's rpc_client.
8310  */
8311 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
8312 {
8313     int status;
8314     struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
8315     struct nfs_client *clp = NFS_SERVER(dir)->nfs_client;
8316     struct nfs4_secinfo_arg args = {
8317         .dir_fh = NFS_FH(dir),
8318         .name   = name,
8319     };
8320     struct nfs4_secinfo_res res = {
8321         .flavors     = flavors,
8322     };
8323     struct rpc_message msg = {
8324         .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
8325         .rpc_argp = &args,
8326         .rpc_resp = &res,
8327     };
8328     struct nfs4_call_sync_data data = {
8329         .seq_server = NFS_SERVER(dir),
8330         .seq_args = &args.seq_args,
8331         .seq_res = &res.seq_res,
8332     };
8333     struct rpc_task_setup task_setup = {
8334         .rpc_client = clnt,
8335         .rpc_message = &msg,
8336         .callback_ops = clp->cl_mvops->call_sync_ops,
8337         .callback_data = &data,
8338         .flags = RPC_TASK_NO_ROUND_ROBIN,
8339     };
8340     const struct cred *cred = NULL;
8341 
8342     if (use_integrity) {
8343         clnt = clp->cl_rpcclient;
8344         task_setup.rpc_client = clnt;
8345 
8346         cred = nfs4_get_clid_cred(clp);
8347         msg.rpc_cred = cred;
8348     }
8349 
8350     dprintk("NFS call  secinfo %s\n", name->name);
8351 
8352     nfs4_state_protect(clp, NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg);
8353     nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
8354     status = nfs4_call_sync_custom(&task_setup);
8355 
8356     dprintk("NFS reply  secinfo: %d\n", status);
8357 
8358     put_cred(cred);
8359     return status;
8360 }
8361 
8362 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
8363               struct nfs4_secinfo_flavors *flavors)
8364 {
8365     struct nfs4_exception exception = {
8366         .interruptible = true,
8367     };
8368     int err;
8369     do {
8370         err = -NFS4ERR_WRONGSEC;
8371 
8372         /* try to use integrity protection with machine cred */
8373         if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
8374             err = _nfs4_proc_secinfo(dir, name, flavors, true);
8375 
8376         /*
8377          * if unable to use integrity protection, or SECINFO with
8378          * integrity protection returns NFS4ERR_WRONGSEC (which is
8379          * disallowed by spec, but exists in deployed servers) use
8380          * the current filesystem's rpc_client and the user cred.
8381          */
8382         if (err == -NFS4ERR_WRONGSEC)
8383             err = _nfs4_proc_secinfo(dir, name, flavors, false);
8384 
8385         trace_nfs4_secinfo(dir, name, err);
8386         err = nfs4_handle_exception(NFS_SERVER(dir), err,
8387                 &exception);
8388     } while (exception.retry);
8389     return err;
8390 }
8391 
8392 #ifdef CONFIG_NFS_V4_1
8393 /*
8394  * Check the exchange flags returned by the server for invalid flags, having
8395  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
8396  * DS flags set.
8397  */
8398 static int nfs4_check_cl_exchange_flags(u32 flags, u32 version)
8399 {
8400     if (version >= 2 && (flags & ~EXCHGID4_2_FLAG_MASK_R))
8401         goto out_inval;
8402     else if (version < 2 && (flags & ~EXCHGID4_FLAG_MASK_R))
8403         goto out_inval;
8404     if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
8405         (flags & EXCHGID4_FLAG_USE_NON_PNFS))
8406         goto out_inval;
8407     if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
8408         goto out_inval;
8409     return NFS_OK;
8410 out_inval:
8411     return -NFS4ERR_INVAL;
8412 }
8413 
8414 static bool
8415 nfs41_same_server_scope(struct nfs41_server_scope *a,
8416             struct nfs41_server_scope *b)
8417 {
8418     if (a->server_scope_sz != b->server_scope_sz)
8419         return false;
8420     return memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0;
8421 }
8422 
8423 static void
8424 nfs4_bind_one_conn_to_session_done(struct rpc_task *task, void *calldata)
8425 {
8426     struct nfs41_bind_conn_to_session_args *args = task->tk_msg.rpc_argp;
8427     struct nfs41_bind_conn_to_session_res *res = task->tk_msg.rpc_resp;
8428     struct nfs_client *clp = args->client;
8429 
8430     switch (task->tk_status) {
8431     case -NFS4ERR_BADSESSION:
8432     case -NFS4ERR_DEADSESSION:
8433         nfs4_schedule_session_recovery(clp->cl_session,
8434                 task->tk_status);
8435         return;
8436     }
8437     if (args->dir == NFS4_CDFC4_FORE_OR_BOTH &&
8438             res->dir != NFS4_CDFS4_BOTH) {
8439         rpc_task_close_connection(task);
8440         if (args->retries++ < MAX_BIND_CONN_TO_SESSION_RETRIES)
8441             rpc_restart_call(task);
8442     }
8443 }
8444 
8445 static const struct rpc_call_ops nfs4_bind_one_conn_to_session_ops = {
8446     .rpc_call_done =  nfs4_bind_one_conn_to_session_done,
8447 };
8448 
8449 /*
8450  * nfs4_proc_bind_one_conn_to_session()
8451  *
8452  * The 4.1 client currently uses the same TCP connection for the
8453  * fore and backchannel.
8454  */
8455 static
8456 int nfs4_proc_bind_one_conn_to_session(struct rpc_clnt *clnt,
8457         struct rpc_xprt *xprt,
8458         struct nfs_client *clp,
8459         const struct cred *cred)
8460 {
8461     int status;
8462     struct nfs41_bind_conn_to_session_args args = {
8463         .client = clp,
8464         .dir = NFS4_CDFC4_FORE_OR_BOTH,
8465         .retries = 0,
8466     };
8467     struct nfs41_bind_conn_to_session_res res;
8468     struct rpc_message msg = {
8469         .rpc_proc =
8470             &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
8471         .rpc_argp = &args,
8472         .rpc_resp = &res,
8473         .rpc_cred = cred,
8474     };
8475     struct rpc_task_setup task_setup_data = {
8476         .rpc_client = clnt,
8477         .rpc_xprt = xprt,
8478         .callback_ops = &nfs4_bind_one_conn_to_session_ops,
8479         .rpc_message = &msg,
8480         .flags = RPC_TASK_TIMEOUT,
8481     };
8482     struct rpc_task *task;
8483 
8484     nfs4_copy_sessionid(&args.sessionid, &clp->cl_session->sess_id);
8485     if (!(clp->cl_session->flags & SESSION4_BACK_CHAN))
8486         args.dir = NFS4_CDFC4_FORE;
8487 
8488     /* Do not set the backchannel flag unless this is clnt->cl_xprt */
8489     if (xprt != rcu_access_pointer(clnt->cl_xprt))
8490         args.dir = NFS4_CDFC4_FORE;
8491 
8492     task = rpc_run_task(&task_setup_data);
8493     if (!IS_ERR(task)) {
8494         status = task->tk_status;
8495         rpc_put_task(task);
8496     } else
8497         status = PTR_ERR(task);
8498     trace_nfs4_bind_conn_to_session(clp, status);
8499     if (status == 0) {
8500         if (memcmp(res.sessionid.data,
8501             clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
8502             dprintk("NFS: %s: Session ID mismatch\n", __func__);
8503             return -EIO;
8504         }
8505         if ((res.dir & args.dir) != res.dir || res.dir == 0) {
8506             dprintk("NFS: %s: Unexpected direction from server\n",
8507                 __func__);
8508             return -EIO;
8509         }
8510         if (res.use_conn_in_rdma_mode != args.use_conn_in_rdma_mode) {
8511             dprintk("NFS: %s: Server returned RDMA mode = true\n",
8512                 __func__);
8513             return -EIO;
8514         }
8515     }
8516 
8517     return status;
8518 }
8519 
8520 struct rpc_bind_conn_calldata {
8521     struct nfs_client *clp;
8522     const struct cred *cred;
8523 };
8524 
8525 static int
8526 nfs4_proc_bind_conn_to_session_callback(struct rpc_clnt *clnt,
8527         struct rpc_xprt *xprt,
8528         void *calldata)
8529 {
8530     struct rpc_bind_conn_calldata *p = calldata;
8531 
8532     return nfs4_proc_bind_one_conn_to_session(clnt, xprt, p->clp, p->cred);
8533 }
8534 
8535 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, const struct cred *cred)
8536 {
8537     struct rpc_bind_conn_calldata data = {
8538         .clp = clp,
8539         .cred = cred,
8540     };
8541     return rpc_clnt_iterate_for_each_xprt(clp->cl_rpcclient,
8542             nfs4_proc_bind_conn_to_session_callback, &data);
8543 }
8544 
8545 /*
8546  * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map
8547  * and operations we'd like to see to enable certain features in the allow map
8548  */
8549 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
8550     .how = SP4_MACH_CRED,
8551     .enforce.u.words = {
8552         [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
8553               1 << (OP_EXCHANGE_ID - 32) |
8554               1 << (OP_CREATE_SESSION - 32) |
8555               1 << (OP_DESTROY_SESSION - 32) |
8556               1 << (OP_DESTROY_CLIENTID - 32)
8557     },
8558     .allow.u.words = {
8559         [0] = 1 << (OP_CLOSE) |
8560               1 << (OP_OPEN_DOWNGRADE) |
8561               1 << (OP_LOCKU) |
8562               1 << (OP_DELEGRETURN) |
8563               1 << (OP_COMMIT),
8564         [1] = 1 << (OP_SECINFO - 32) |
8565               1 << (OP_SECINFO_NO_NAME - 32) |
8566               1 << (OP_LAYOUTRETURN - 32) |
8567               1 << (OP_TEST_STATEID - 32) |
8568               1 << (OP_FREE_STATEID - 32) |
8569               1 << (OP_WRITE - 32)
8570     }
8571 };
8572 
8573 /*
8574  * Select the state protection mode for client `clp' given the server results
8575  * from exchange_id in `sp'.
8576  *
8577  * Returns 0 on success, negative errno otherwise.
8578  */
8579 static int nfs4_sp4_select_mode(struct nfs_client *clp,
8580                  struct nfs41_state_protection *sp)
8581 {
8582     static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = {
8583         [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
8584               1 << (OP_EXCHANGE_ID - 32) |
8585               1 << (OP_CREATE_SESSION - 32) |
8586               1 << (OP_DESTROY_SESSION - 32) |
8587               1 << (OP_DESTROY_CLIENTID - 32)
8588     };
8589     unsigned long flags = 0;
8590     unsigned int i;
8591     int ret = 0;
8592 
8593     if (sp->how == SP4_MACH_CRED) {
8594         /* Print state protect result */
8595         dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n");
8596         for (i = 0; i <= LAST_NFS4_OP; i++) {
8597             if (test_bit(i, sp->enforce.u.longs))
8598                 dfprintk(MOUNT, "  enforce op %d\n", i);
8599             if (test_bit(i, sp->allow.u.longs))
8600                 dfprintk(MOUNT, "  allow op %d\n", i);
8601         }
8602 
8603         /* make sure nothing is on enforce list that isn't supported */
8604         for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) {
8605             if (sp->enforce.u.words[i] & ~supported_enforce[i]) {
8606                 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
8607                 ret = -EINVAL;
8608                 goto out;
8609             }
8610         }
8611 
8612         /*
8613          * Minimal mode - state operations are allowed to use machine
8614          * credential.  Note this already happens by default, so the
8615          * client doesn't have to do anything more than the negotiation.
8616          *
8617          * NOTE: we don't care if EXCHANGE_ID is in the list -
8618          *       we're already using the machine cred for exchange_id
8619          *       and will never use a different cred.
8620          */
8621         if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) &&
8622             test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) &&
8623             test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) &&
8624             test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) {
8625             dfprintk(MOUNT, "sp4_mach_cred:\n");
8626             dfprintk(MOUNT, "  minimal mode enabled\n");
8627             __set_bit(NFS_SP4_MACH_CRED_MINIMAL, &flags);
8628         } else {
8629             dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
8630             ret = -EINVAL;
8631             goto out;
8632         }
8633 
8634         if (test_bit(OP_CLOSE, sp->allow.u.longs) &&
8635             test_bit(OP_OPEN_DOWNGRADE, sp->allow.u.longs) &&
8636             test_bit(OP_DELEGRETURN, sp->allow.u.longs) &&
8637             test_bit(OP_LOCKU, sp->allow.u.longs)) {
8638             dfprintk(MOUNT, "  cleanup mode enabled\n");
8639             __set_bit(NFS_SP4_MACH_CRED_CLEANUP, &flags);
8640         }
8641 
8642         if (test_bit(OP_LAYOUTRETURN, sp->allow.u.longs)) {
8643             dfprintk(MOUNT, "  pnfs cleanup mode enabled\n");
8644             __set_bit(NFS_SP4_MACH_CRED_PNFS_CLEANUP, &flags);
8645         }
8646 
8647         if (test_bit(OP_SECINFO, sp->allow.u.longs) &&
8648             test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) {
8649             dfprintk(MOUNT, "  secinfo mode enabled\n");
8650             __set_bit(NFS_SP4_MACH_CRED_SECINFO, &flags);
8651         }
8652 
8653         if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) &&
8654             test_bit(OP_FREE_STATEID, sp->allow.u.longs)) {
8655             dfprintk(MOUNT, "  stateid mode enabled\n");
8656             __set_bit(NFS_SP4_MACH_CRED_STATEID, &flags);
8657         }
8658 
8659         if (test_bit(OP_WRITE, sp->allow.u.longs)) {
8660             dfprintk(MOUNT, "  write mode enabled\n");
8661             __set_bit(NFS_SP4_MACH_CRED_WRITE, &flags);
8662         }
8663 
8664         if (test_bit(OP_COMMIT, sp->allow.u.longs)) {
8665             dfprintk(MOUNT, "  commit mode enabled\n");
8666             __set_bit(NFS_SP4_MACH_CRED_COMMIT, &flags);
8667         }
8668     }
8669 out:
8670     clp->cl_sp4_flags = flags;
8671     return ret;
8672 }
8673 
8674 struct nfs41_exchange_id_data {
8675     struct nfs41_exchange_id_res res;
8676     struct nfs41_exchange_id_args args;
8677 };
8678 
8679 static void nfs4_exchange_id_release(void *data)
8680 {
8681     struct nfs41_exchange_id_data *cdata =
8682                     (struct nfs41_exchange_id_data *)data;
8683 
8684     nfs_put_client(cdata->args.client);
8685     kfree(cdata->res.impl_id);
8686     kfree(cdata->res.server_scope);
8687     kfree(cdata->res.server_owner);
8688     kfree(cdata);
8689 }
8690 
8691 static const struct rpc_call_ops nfs4_exchange_id_call_ops = {
8692     .rpc_release = nfs4_exchange_id_release,
8693 };
8694 
8695 /*
8696  * _nfs4_proc_exchange_id()
8697  *
8698  * Wrapper for EXCHANGE_ID operation.
8699  */
8700 static struct rpc_task *
8701 nfs4_run_exchange_id(struct nfs_client *clp, const struct cred *cred,
8702             u32 sp4_how, struct rpc_xprt *xprt)
8703 {
8704     struct rpc_message msg = {
8705         .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
8706         .rpc_cred = cred,
8707     };
8708     struct rpc_task_setup task_setup_data = {
8709         .rpc_client = clp->cl_rpcclient,
8710         .callback_ops = &nfs4_exchange_id_call_ops,
8711         .rpc_message = &msg,
8712         .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN,
8713     };
8714     struct nfs41_exchange_id_data *calldata;
8715     int status;
8716 
8717     if (!refcount_inc_not_zero(&clp->cl_count))
8718         return ERR_PTR(-EIO);
8719 
8720     status = -ENOMEM;
8721     calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
8722     if (!calldata)
8723         goto out;
8724 
8725     nfs4_init_boot_verifier(clp, &calldata->args.verifier);
8726 
8727     status = nfs4_init_uniform_client_string(clp);
8728     if (status)
8729         goto out_calldata;
8730 
8731     calldata->res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
8732                         GFP_NOFS);
8733     status = -ENOMEM;
8734     if (unlikely(calldata->res.server_owner == NULL))
8735         goto out_calldata;
8736 
8737     calldata->res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
8738                     GFP_NOFS);
8739     if (unlikely(calldata->res.server_scope == NULL))
8740         goto out_server_owner;
8741 
8742     calldata->res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
8743     if (unlikely(calldata->res.impl_id == NULL))
8744         goto out_server_scope;
8745 
8746     switch (sp4_how) {
8747     case SP4_NONE:
8748         calldata->args.state_protect.how = SP4_NONE;
8749         break;
8750 
8751     case SP4_MACH_CRED:
8752         calldata->args.state_protect = nfs4_sp4_mach_cred_request;
8753         break;
8754 
8755     default:
8756         /* unsupported! */
8757         WARN_ON_ONCE(1);
8758         status = -EINVAL;
8759         goto out_impl_id;
8760     }
8761     if (xprt) {
8762         task_setup_data.rpc_xprt = xprt;
8763         task_setup_data.flags |= RPC_TASK_SOFTCONN;
8764         memcpy(calldata->args.verifier.data, clp->cl_confirm.data,
8765                 sizeof(calldata->args.verifier.data));
8766     }
8767     calldata->args.client = clp;
8768     calldata->args.flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
8769     EXCHGID4_FLAG_BIND_PRINC_STATEID;
8770 #ifdef CONFIG_NFS_V4_1_MIGRATION
8771     calldata->args.flags |= EXCHGID4_FLAG_SUPP_MOVED_MIGR;
8772 #endif
8773     msg.rpc_argp = &calldata->args;
8774     msg.rpc_resp = &calldata->res;
8775     task_setup_data.callback_data = calldata;
8776 
8777     return rpc_run_task(&task_setup_data);
8778 
8779 out_impl_id:
8780     kfree(calldata->res.impl_id);
8781 out_server_scope:
8782     kfree(calldata->res.server_scope);
8783 out_server_owner:
8784     kfree(calldata->res.server_owner);
8785 out_calldata:
8786     kfree(calldata);
8787 out:
8788     nfs_put_client(clp);
8789     return ERR_PTR(status);
8790 }
8791 
8792 /*
8793  * _nfs4_proc_exchange_id()
8794  *
8795  * Wrapper for EXCHANGE_ID operation.
8796  */
8797 static int _nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred,
8798             u32 sp4_how)
8799 {
8800     struct rpc_task *task;
8801     struct nfs41_exchange_id_args *argp;
8802     struct nfs41_exchange_id_res *resp;
8803     unsigned long now = jiffies;
8804     int status;
8805 
8806     task = nfs4_run_exchange_id(clp, cred, sp4_how, NULL);
8807     if (IS_ERR(task))
8808         return PTR_ERR(task);
8809 
8810     argp = task->tk_msg.rpc_argp;
8811     resp = task->tk_msg.rpc_resp;
8812     status = task->tk_status;
8813     if (status  != 0)
8814         goto out;
8815 
8816     status = nfs4_check_cl_exchange_flags(resp->flags,
8817             clp->cl_mvops->minor_version);
8818     if (status  != 0)
8819         goto out;
8820 
8821     status = nfs4_sp4_select_mode(clp, &resp->state_protect);
8822     if (status != 0)
8823         goto out;
8824 
8825     do_renew_lease(clp, now);
8826 
8827     clp->cl_clientid = resp->clientid;
8828     clp->cl_exchange_flags = resp->flags;
8829     clp->cl_seqid = resp->seqid;
8830     /* Client ID is not confirmed */
8831     if (!(resp->flags & EXCHGID4_FLAG_CONFIRMED_R))
8832         clear_bit(NFS4_SESSION_ESTABLISHED,
8833               &clp->cl_session->session_state);
8834 
8835     if (clp->cl_serverscope != NULL &&
8836         !nfs41_same_server_scope(clp->cl_serverscope,
8837                 resp->server_scope)) {
8838         dprintk("%s: server_scope mismatch detected\n",
8839             __func__);
8840         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
8841     }
8842 
8843     swap(clp->cl_serverowner, resp->server_owner);
8844     swap(clp->cl_serverscope, resp->server_scope);
8845     swap(clp->cl_implid, resp->impl_id);
8846 
8847     /* Save the EXCHANGE_ID verifier session trunk tests */
8848     memcpy(clp->cl_confirm.data, argp->verifier.data,
8849            sizeof(clp->cl_confirm.data));
8850 out:
8851     trace_nfs4_exchange_id(clp, status);
8852     rpc_put_task(task);
8853     return status;
8854 }
8855 
8856 /*
8857  * nfs4_proc_exchange_id()
8858  *
8859  * Returns zero, a negative errno, or a negative NFS4ERR status code.
8860  *
8861  * Since the clientid has expired, all compounds using sessions
8862  * associated with the stale clientid will be returning
8863  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
8864  * be in some phase of session reset.
8865  *
8866  * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used.
8867  */
8868 int nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred)
8869 {
8870     rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor;
8871     int status;
8872 
8873     /* try SP4_MACH_CRED if krb5i/p */
8874     if (authflavor == RPC_AUTH_GSS_KRB5I ||
8875         authflavor == RPC_AUTH_GSS_KRB5P) {
8876         status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED);
8877         if (!status)
8878             return 0;
8879     }
8880 
8881     /* try SP4_NONE */
8882     return _nfs4_proc_exchange_id(clp, cred, SP4_NONE);
8883 }
8884 
8885 /**
8886  * nfs4_test_session_trunk
8887  *
8888  * This is an add_xprt_test() test function called from
8889  * rpc_clnt_setup_test_and_add_xprt.
8890  *
8891  * The rpc_xprt_switch is referrenced by rpc_clnt_setup_test_and_add_xprt
8892  * and is dereferrenced in nfs4_exchange_id_release
8893  *
8894  * Upon success, add the new transport to the rpc_clnt
8895  *
8896  * @clnt: struct rpc_clnt to get new transport
8897  * @xprt: the rpc_xprt to test
8898  * @data: call data for _nfs4_proc_exchange_id.
8899  */
8900 void nfs4_test_session_trunk(struct rpc_clnt *clnt, struct rpc_xprt *xprt,
8901                 void *data)
8902 {
8903     struct nfs4_add_xprt_data *adata = (struct nfs4_add_xprt_data *)data;
8904     struct rpc_task *task;
8905     int status;
8906 
8907     u32 sp4_how;
8908 
8909     dprintk("--> %s try %s\n", __func__,
8910         xprt->address_strings[RPC_DISPLAY_ADDR]);
8911 
8912     sp4_how = (adata->clp->cl_sp4_flags == 0 ? SP4_NONE : SP4_MACH_CRED);
8913 
8914     /* Test connection for session trunking. Async exchange_id call */
8915     task = nfs4_run_exchange_id(adata->clp, adata->cred, sp4_how, xprt);
8916     if (IS_ERR(task))
8917         return;
8918 
8919     status = task->tk_status;
8920     if (status == 0)
8921         status = nfs4_detect_session_trunking(adata->clp,
8922                 task->tk_msg.rpc_resp, xprt);
8923 
8924     if (status == 0)
8925         rpc_clnt_xprt_switch_add_xprt(clnt, xprt);
8926     else if (rpc_clnt_xprt_switch_has_addr(clnt,
8927                 (struct sockaddr *)&xprt->addr))
8928         rpc_clnt_xprt_switch_remove_xprt(clnt, xprt);
8929 
8930     rpc_put_task(task);
8931 }
8932 EXPORT_SYMBOL_GPL(nfs4_test_session_trunk);
8933 
8934 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
8935         const struct cred *cred)
8936 {
8937     struct rpc_message msg = {
8938         .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
8939         .rpc_argp = clp,
8940         .rpc_cred = cred,
8941     };
8942     int status;
8943 
8944     status = rpc_call_sync(clp->cl_rpcclient, &msg,
8945                    RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
8946     trace_nfs4_destroy_clientid(clp, status);
8947     if (status)
8948         dprintk("NFS: Got error %d from the server %s on "
8949             "DESTROY_CLIENTID.", status, clp->cl_hostname);
8950     return status;
8951 }
8952 
8953 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
8954         const struct cred *cred)
8955 {
8956     unsigned int loop;
8957     int ret;
8958 
8959     for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
8960         ret = _nfs4_proc_destroy_clientid(clp, cred);
8961         switch (ret) {
8962         case -NFS4ERR_DELAY:
8963         case -NFS4ERR_CLIENTID_BUSY:
8964             ssleep(1);
8965             break;
8966         default:
8967             return ret;
8968         }
8969     }
8970     return 0;
8971 }
8972 
8973 int nfs4_destroy_clientid(struct nfs_client *clp)
8974 {
8975     const struct cred *cred;
8976     int ret = 0;
8977 
8978     if (clp->cl_mvops->minor_version < 1)
8979         goto out;
8980     if (clp->cl_exchange_flags == 0)
8981         goto out;
8982     if (clp->cl_preserve_clid)
8983         goto out;
8984     cred = nfs4_get_clid_cred(clp);
8985     ret = nfs4_proc_destroy_clientid(clp, cred);
8986     put_cred(cred);
8987     switch (ret) {
8988     case 0:
8989     case -NFS4ERR_STALE_CLIENTID:
8990         clp->cl_exchange_flags = 0;
8991     }
8992 out:
8993     return ret;
8994 }
8995 
8996 #endif /* CONFIG_NFS_V4_1 */
8997 
8998 struct nfs4_get_lease_time_data {
8999     struct nfs4_get_lease_time_args *args;
9000     struct nfs4_get_lease_time_res *res;
9001     struct nfs_client *clp;
9002 };
9003 
9004 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
9005                     void *calldata)
9006 {
9007     struct nfs4_get_lease_time_data *data =
9008             (struct nfs4_get_lease_time_data *)calldata;
9009 
9010     /* just setup sequence, do not trigger session recovery
9011        since we're invoked within one */
9012     nfs4_setup_sequence(data->clp,
9013             &data->args->la_seq_args,
9014             &data->res->lr_seq_res,
9015             task);
9016 }
9017 
9018 /*
9019  * Called from nfs4_state_manager thread for session setup, so don't recover
9020  * from sequence operation or clientid errors.
9021  */
9022 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
9023 {
9024     struct nfs4_get_lease_time_data *data =
9025             (struct nfs4_get_lease_time_data *)calldata;
9026 
9027     if (!nfs4_sequence_done(task, &data->res->lr_seq_res))
9028         return;
9029     switch (task->tk_status) {
9030     case -NFS4ERR_DELAY:
9031     case -NFS4ERR_GRACE:
9032         rpc_delay(task, NFS4_POLL_RETRY_MIN);
9033         task->tk_status = 0;
9034         fallthrough;
9035     case -NFS4ERR_RETRY_UNCACHED_REP:
9036         rpc_restart_call_prepare(task);
9037         return;
9038     }
9039 }
9040 
9041 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
9042     .rpc_call_prepare = nfs4_get_lease_time_prepare,
9043     .rpc_call_done = nfs4_get_lease_time_done,
9044 };
9045 
9046 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
9047 {
9048     struct nfs4_get_lease_time_args args;
9049     struct nfs4_get_lease_time_res res = {
9050         .lr_fsinfo = fsinfo,
9051     };
9052     struct nfs4_get_lease_time_data data = {
9053         .args = &args,
9054         .res = &res,
9055         .clp = clp,
9056     };
9057     struct rpc_message msg = {
9058         .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
9059         .rpc_argp = &args,
9060         .rpc_resp = &res,
9061     };
9062     struct rpc_task_setup task_setup = {
9063         .rpc_client = clp->cl_rpcclient,
9064         .rpc_message = &msg,
9065         .callback_ops = &nfs4_get_lease_time_ops,
9066         .callback_data = &data,
9067         .flags = RPC_TASK_TIMEOUT,
9068     };
9069 
9070     nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0, 1);
9071     return nfs4_call_sync_custom(&task_setup);
9072 }
9073 
9074 #ifdef CONFIG_NFS_V4_1
9075 
9076 /*
9077  * Initialize the values to be used by the client in CREATE_SESSION
9078  * If nfs4_init_session set the fore channel request and response sizes,
9079  * use them.
9080  *
9081  * Set the back channel max_resp_sz_cached to zero to force the client to
9082  * always set csa_cachethis to FALSE because the current implementation
9083  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
9084  */
9085 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args,
9086                     struct rpc_clnt *clnt)
9087 {
9088     unsigned int max_rqst_sz, max_resp_sz;
9089     unsigned int max_bc_payload = rpc_max_bc_payload(clnt);
9090     unsigned int max_bc_slots = rpc_num_bc_slots(clnt);
9091 
9092     max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
9093     max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
9094 
9095     /* Fore channel attributes */
9096     args->fc_attrs.max_rqst_sz = max_rqst_sz;
9097     args->fc_attrs.max_resp_sz = max_resp_sz;
9098     args->fc_attrs.max_ops = NFS4_MAX_OPS;
9099     args->fc_attrs.max_reqs = max_session_slots;
9100 
9101     dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
9102         "max_ops=%u max_reqs=%u\n",
9103         __func__,
9104         args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
9105         args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
9106 
9107     /* Back channel attributes */
9108     args->bc_attrs.max_rqst_sz = max_bc_payload;
9109     args->bc_attrs.max_resp_sz = max_bc_payload;
9110     args->bc_attrs.max_resp_sz_cached = 0;
9111     args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
9112     args->bc_attrs.max_reqs = max_t(unsigned short, max_session_cb_slots, 1);
9113     if (args->bc_attrs.max_reqs > max_bc_slots)
9114         args->bc_attrs.max_reqs = max_bc_slots;
9115 
9116     dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
9117         "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
9118         __func__,
9119         args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
9120         args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
9121         args->bc_attrs.max_reqs);
9122 }
9123 
9124 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args,
9125         struct nfs41_create_session_res *res)
9126 {
9127     struct nfs4_channel_attrs *sent = &args->fc_attrs;
9128     struct nfs4_channel_attrs *rcvd = &res->fc_attrs;
9129 
9130     if (rcvd->max_resp_sz > sent->max_resp_sz)
9131         return -EINVAL;
9132     /*
9133      * Our requested max_ops is the minimum we need; we're not
9134      * prepared to break up compounds into smaller pieces than that.
9135      * So, no point even trying to continue if the server won't
9136      * cooperate:
9137      */
9138     if (rcvd->max_ops < sent->max_ops)
9139         return -EINVAL;
9140     if (rcvd->max_reqs == 0)
9141         return -EINVAL;
9142     if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
9143         rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
9144     return 0;
9145 }
9146 
9147 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args,
9148         struct nfs41_create_session_res *res)
9149 {
9150     struct nfs4_channel_attrs *sent = &args->bc_attrs;
9151     struct nfs4_channel_attrs *rcvd = &res->bc_attrs;
9152 
9153     if (!(res->flags & SESSION4_BACK_CHAN))
9154         goto out;
9155     if (rcvd->max_rqst_sz > sent->max_rqst_sz)
9156         return -EINVAL;
9157     if (rcvd->max_resp_sz < sent->max_resp_sz)
9158         return -EINVAL;
9159     if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
9160         return -EINVAL;
9161     if (rcvd->max_ops > sent->max_ops)
9162         return -EINVAL;
9163     if (rcvd->max_reqs > sent->max_reqs)
9164         return -EINVAL;
9165 out:
9166     return 0;
9167 }
9168 
9169 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
9170                      struct nfs41_create_session_res *res)
9171 {
9172     int ret;
9173 
9174     ret = nfs4_verify_fore_channel_attrs(args, res);
9175     if (ret)
9176         return ret;
9177     return nfs4_verify_back_channel_attrs(args, res);
9178 }
9179 
9180 static void nfs4_update_session(struct nfs4_session *session,
9181         struct nfs41_create_session_res *res)
9182 {
9183     nfs4_copy_sessionid(&session->sess_id, &res->sessionid);
9184     /* Mark client id and session as being confirmed */
9185     session->clp->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
9186     set_bit(NFS4_SESSION_ESTABLISHED, &session->session_state);
9187     session->flags = res->flags;
9188     memcpy(&session->fc_attrs, &res->fc_attrs, sizeof(session->fc_attrs));
9189     if (res->flags & SESSION4_BACK_CHAN)
9190         memcpy(&session->bc_attrs, &res->bc_attrs,
9191                 sizeof(session->bc_attrs));
9192 }
9193 
9194 static int _nfs4_proc_create_session(struct nfs_client *clp,
9195         const struct cred *cred)
9196 {
9197     struct nfs4_session *session = clp->cl_session;
9198     struct nfs41_create_session_args args = {
9199         .client = clp,
9200         .clientid = clp->cl_clientid,
9201         .seqid = clp->cl_seqid,
9202         .cb_program = NFS4_CALLBACK,
9203     };
9204     struct nfs41_create_session_res res;
9205 
9206     struct rpc_message msg = {
9207         .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
9208         .rpc_argp = &args,
9209         .rpc_resp = &res,
9210         .rpc_cred = cred,
9211     };
9212     int status;
9213 
9214     nfs4_init_channel_attrs(&args, clp->cl_rpcclient);
9215     args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
9216 
9217     status = rpc_call_sync(session->clp->cl_rpcclient, &msg,
9218                    RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
9219     trace_nfs4_create_session(clp, status);
9220 
9221     switch (status) {
9222     case -NFS4ERR_STALE_CLIENTID:
9223     case -NFS4ERR_DELAY:
9224     case -ETIMEDOUT:
9225     case -EACCES:
9226     case -EAGAIN:
9227         goto out;
9228     }
9229 
9230     clp->cl_seqid++;
9231     if (!status) {
9232         /* Verify the session's negotiated channel_attrs values */
9233         status = nfs4_verify_channel_attrs(&args, &res);
9234         /* Increment the clientid slot sequence id */
9235         if (status)
9236             goto out;
9237         nfs4_update_session(session, &res);
9238     }
9239 out:
9240     return status;
9241 }
9242 
9243 /*
9244  * Issues a CREATE_SESSION operation to the server.
9245  * It is the responsibility of the caller to verify the session is
9246  * expired before calling this routine.
9247  */
9248 int nfs4_proc_create_session(struct nfs_client *clp, const struct cred *cred)
9249 {
9250     int status;
9251     unsigned *ptr;
9252     struct nfs4_session *session = clp->cl_session;
9253     struct nfs4_add_xprt_data xprtdata = {
9254         .clp = clp,
9255     };
9256     struct rpc_add_xprt_test rpcdata = {
9257         .add_xprt_test = clp->cl_mvops->session_trunk,
9258         .data = &xprtdata,
9259     };
9260 
9261     dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
9262 
9263     status = _nfs4_proc_create_session(clp, cred);
9264     if (status)
9265         goto out;
9266 
9267     /* Init or reset the session slot tables */
9268     status = nfs4_setup_session_slot_tables(session);
9269     dprintk("slot table setup returned %d\n", status);
9270     if (status)
9271         goto out;
9272 
9273     ptr = (unsigned *)&session->sess_id.data[0];
9274     dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
9275         clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
9276     rpc_clnt_probe_trunked_xprts(clp->cl_rpcclient, &rpcdata);
9277 out:
9278     return status;
9279 }
9280 
9281 /*
9282  * Issue the over-the-wire RPC DESTROY_SESSION.
9283  * The caller must serialize access to this routine.
9284  */
9285 int nfs4_proc_destroy_session(struct nfs4_session *session,
9286         const struct cred *cred)
9287 {
9288     struct rpc_message msg = {
9289         .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
9290         .rpc_argp = session,
9291         .rpc_cred = cred,
9292     };
9293     int status = 0;
9294 
9295     /* session is still being setup */
9296     if (!test_and_clear_bit(NFS4_SESSION_ESTABLISHED, &session->session_state))
9297         return 0;
9298 
9299     status = rpc_call_sync(session->clp->cl_rpcclient, &msg,
9300                    RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
9301     trace_nfs4_destroy_session(session->clp, status);
9302 
9303     if (status)
9304         dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
9305             "Session has been destroyed regardless...\n", status);
9306     rpc_clnt_manage_trunked_xprts(session->clp->cl_rpcclient);
9307     return status;
9308 }
9309 
9310 /*
9311  * Renew the cl_session lease.
9312  */
9313 struct nfs4_sequence_data {
9314     struct nfs_client *clp;
9315     struct nfs4_sequence_args args;
9316     struct nfs4_sequence_res res;
9317 };
9318 
9319 static void nfs41_sequence_release(void *data)
9320 {
9321     struct nfs4_sequence_data *calldata = data;
9322     struct nfs_client *clp = calldata->clp;
9323 
9324     if (refcount_read(&clp->cl_count) > 1)
9325         nfs4_schedule_state_renewal(clp);
9326     nfs_put_client(clp);
9327     kfree(calldata);
9328 }
9329 
9330 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
9331 {
9332     switch(task->tk_status) {
9333     case -NFS4ERR_DELAY:
9334         rpc_delay(task, NFS4_POLL_RETRY_MAX);
9335         return -EAGAIN;
9336     default:
9337         nfs4_schedule_lease_recovery(clp);
9338     }
9339     return 0;
9340 }
9341 
9342 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
9343 {
9344     struct nfs4_sequence_data *calldata = data;
9345     struct nfs_client *clp = calldata->clp;
9346 
9347     if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
9348         return;
9349 
9350     trace_nfs4_sequence(clp, task->tk_status);
9351     if (task->tk_status < 0) {
9352         dprintk("%s ERROR %d\n", __func__, task->tk_status);
9353         if (refcount_read(&clp->cl_count) == 1)
9354             return;
9355 
9356         if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
9357             rpc_restart_call_prepare(task);
9358             return;
9359         }
9360     }
9361     dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
9362 }
9363 
9364 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
9365 {
9366     struct nfs4_sequence_data *calldata = data;
9367     struct nfs_client *clp = calldata->clp;
9368     struct nfs4_sequence_args *args;
9369     struct nfs4_sequence_res *res;
9370 
9371     args = task->tk_msg.rpc_argp;
9372     res = task->tk_msg.rpc_resp;
9373 
9374     nfs4_setup_sequence(clp, args, res, task);
9375 }
9376 
9377 static const struct rpc_call_ops nfs41_sequence_ops = {
9378     .rpc_call_done = nfs41_sequence_call_done,
9379     .rpc_call_prepare = nfs41_sequence_prepare,
9380     .rpc_release = nfs41_sequence_release,
9381 };
9382 
9383 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
9384         const struct cred *cred,
9385         struct nfs4_slot *slot,
9386         bool is_privileged)
9387 {
9388     struct nfs4_sequence_data *calldata;
9389     struct rpc_message msg = {
9390         .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
9391         .rpc_cred = cred,
9392     };
9393     struct rpc_task_setup task_setup_data = {
9394         .rpc_client = clp->cl_rpcclient,
9395         .rpc_message = &msg,
9396         .callback_ops = &nfs41_sequence_ops,
9397         .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT | RPC_TASK_MOVEABLE,
9398     };
9399     struct rpc_task *ret;
9400 
9401     ret = ERR_PTR(-EIO);
9402     if (!refcount_inc_not_zero(&clp->cl_count))
9403         goto out_err;
9404 
9405     ret = ERR_PTR(-ENOMEM);
9406     calldata = kzalloc(sizeof(*calldata), GFP_KERNEL);
9407     if (calldata == NULL)
9408         goto out_put_clp;
9409     nfs4_init_sequence(&calldata->args, &calldata->res, 0, is_privileged);
9410     nfs4_sequence_attach_slot(&calldata->args, &calldata->res, slot);
9411     msg.rpc_argp = &calldata->args;
9412     msg.rpc_resp = &calldata->res;
9413     calldata->clp = clp;
9414     task_setup_data.callback_data = calldata;
9415 
9416     ret = rpc_run_task(&task_setup_data);
9417     if (IS_ERR(ret))
9418         goto out_err;
9419     return ret;
9420 out_put_clp:
9421     nfs_put_client(clp);
9422 out_err:
9423     nfs41_release_slot(slot);
9424     return ret;
9425 }
9426 
9427 static int nfs41_proc_async_sequence(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags)
9428 {
9429     struct rpc_task *task;
9430     int ret = 0;
9431 
9432     if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
9433         return -EAGAIN;
9434     task = _nfs41_proc_sequence(clp, cred, NULL, false);
9435     if (IS_ERR(task))
9436         ret = PTR_ERR(task);
9437     else
9438         rpc_put_task_async(task);
9439     dprintk("<-- %s status=%d\n", __func__, ret);
9440     return ret;
9441 }
9442 
9443 static int nfs4_proc_sequence(struct nfs_client *clp, const struct cred *cred)
9444 {
9445     struct rpc_task *task;
9446     int ret;
9447 
9448     task = _nfs41_proc_sequence(clp, cred, NULL, true);
9449     if (IS_ERR(task)) {
9450         ret = PTR_ERR(task);
9451         goto out;
9452     }
9453     ret = rpc_wait_for_completion_task(task);
9454     if (!ret)
9455         ret = task->tk_status;
9456     rpc_put_task(task);
9457 out:
9458     dprintk("<-- %s status=%d\n", __func__, ret);
9459     return ret;
9460 }
9461 
9462 struct nfs4_reclaim_complete_data {
9463     struct nfs_client *clp;
9464     struct nfs41_reclaim_complete_args arg;
9465     struct nfs41_reclaim_complete_res res;
9466 };
9467 
9468 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
9469 {
9470     struct nfs4_reclaim_complete_data *calldata = data;
9471 
9472     nfs4_setup_sequence(calldata->clp,
9473             &calldata->arg.seq_args,
9474             &calldata->res.seq_res,
9475             task);
9476 }
9477 
9478 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
9479 {
9480     switch(task->tk_status) {
9481     case 0:
9482         wake_up_all(&clp->cl_lock_waitq);
9483         fallthrough;
9484     case -NFS4ERR_COMPLETE_ALREADY:
9485     case -NFS4ERR_WRONG_CRED: /* What to do here? */
9486         break;
9487     case -NFS4ERR_DELAY:
9488         rpc_delay(task, NFS4_POLL_RETRY_MAX);
9489         fallthrough;
9490     case -NFS4ERR_RETRY_UNCACHED_REP:
9491     case -EACCES:
9492         dprintk("%s: failed to reclaim complete error %d for server %s, retrying\n",
9493             __func__, task->tk_status, clp->cl_hostname);
9494         return -EAGAIN;
9495     case -NFS4ERR_BADSESSION:
9496     case -NFS4ERR_DEADSESSION:
9497     case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
9498         break;
9499     default:
9500         nfs4_schedule_lease_recovery(clp);
9501     }
9502     return 0;
9503 }
9504 
9505 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
9506 {
9507     struct nfs4_reclaim_complete_data *calldata = data;
9508     struct nfs_client *clp = calldata->clp;
9509     struct nfs4_sequence_res *res = &calldata->res.seq_res;
9510 
9511     if (!nfs41_sequence_done(task, res))
9512         return;
9513 
9514     trace_nfs4_reclaim_complete(clp, task->tk_status);
9515     if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
9516         rpc_restart_call_prepare(task);
9517         return;
9518     }
9519 }
9520 
9521 static void nfs4_free_reclaim_complete_data(void *data)
9522 {
9523     struct nfs4_reclaim_complete_data *calldata = data;
9524 
9525     kfree(calldata);
9526 }
9527 
9528 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
9529     .rpc_call_prepare = nfs4_reclaim_complete_prepare,
9530     .rpc_call_done = nfs4_reclaim_complete_done,
9531     .rpc_release = nfs4_free_reclaim_complete_data,
9532 };
9533 
9534 /*
9535  * Issue a global reclaim complete.
9536  */
9537 static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
9538         const struct cred *cred)
9539 {
9540     struct nfs4_reclaim_complete_data *calldata;
9541     struct rpc_message msg = {
9542         .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
9543         .rpc_cred = cred,
9544     };
9545     struct rpc_task_setup task_setup_data = {
9546         .rpc_client = clp->cl_rpcclient,
9547         .rpc_message = &msg,
9548         .callback_ops = &nfs4_reclaim_complete_call_ops,
9549         .flags = RPC_TASK_NO_ROUND_ROBIN,
9550     };
9551     int status = -ENOMEM;
9552 
9553     calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
9554     if (calldata == NULL)
9555         goto out;
9556     calldata->clp = clp;
9557     calldata->arg.one_fs = 0;
9558 
9559     nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0, 1);
9560     msg.rpc_argp = &calldata->arg;
9561     msg.rpc_resp = &calldata->res;
9562     task_setup_data.callback_data = calldata;
9563     status = nfs4_call_sync_custom(&task_setup_data);
9564 out:
9565     dprintk("<-- %s status=%d\n", __func__, status);
9566     return status;
9567 }
9568 
9569 static void
9570 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
9571 {
9572     struct nfs4_layoutget *lgp = calldata;
9573     struct nfs_server *server = NFS_SERVER(lgp->args.inode);
9574 
9575     nfs4_setup_sequence(server->nfs_client, &lgp->args.seq_args,
9576                 &lgp->res.seq_res, task);
9577 }
9578 
9579 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
9580 {
9581     struct nfs4_layoutget *lgp = calldata;
9582 
9583     nfs41_sequence_process(task, &lgp->res.seq_res);
9584 }
9585 
9586 static int
9587 nfs4_layoutget_handle_exception(struct rpc_task *task,
9588         struct nfs4_layoutget *lgp, struct nfs4_exception *exception)
9589 {
9590     struct inode *inode = lgp->args.inode;
9591     struct nfs_server *server = NFS_SERVER(inode);
9592     struct pnfs_layout_hdr *lo = lgp->lo;
9593     int nfs4err = task->tk_status;
9594     int err, status = 0;
9595     LIST_HEAD(head);
9596 
9597     dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status);
9598 
9599     nfs4_sequence_free_slot(&lgp->res.seq_res);
9600 
9601     switch (nfs4err) {
9602     case 0:
9603         goto out;
9604 
9605     /*
9606      * NFS4ERR_LAYOUTUNAVAILABLE means we are not supposed to use pnfs
9607      * on the file. set tk_status to -ENODATA to tell upper layer to
9608      * retry go inband.
9609      */
9610     case -NFS4ERR_LAYOUTUNAVAILABLE:
9611         status = -ENODATA;
9612         goto out;
9613     /*
9614      * NFS4ERR_BADLAYOUT means the MDS cannot return a layout of
9615      * length lgp->args.minlength != 0 (see RFC5661 section 18.43.3).
9616      */
9617     case -NFS4ERR_BADLAYOUT:
9618         status = -EOVERFLOW;
9619         goto out;
9620     /*
9621      * NFS4ERR_LAYOUTTRYLATER is a conflict with another client
9622      * (or clients) writing to the same RAID stripe except when
9623      * the minlength argument is 0 (see RFC5661 section 18.43.3).
9624      *
9625      * Treat it like we would RECALLCONFLICT -- we retry for a little
9626      * while, and then eventually give up.
9627      */
9628     case -NFS4ERR_LAYOUTTRYLATER:
9629         if (lgp->args.minlength == 0) {
9630             status = -EOVERFLOW;
9631             goto out;
9632         }
9633         status = -EBUSY;
9634         break;
9635     case -NFS4ERR_RECALLCONFLICT:
9636         status = -ERECALLCONFLICT;
9637         break;
9638     case -NFS4ERR_DELEG_REVOKED:
9639     case -NFS4ERR_ADMIN_REVOKED:
9640     case -NFS4ERR_EXPIRED:
9641     case -NFS4ERR_BAD_STATEID:
9642         exception->timeout = 0;
9643         spin_lock(&inode->i_lock);
9644         /* If the open stateid was bad, then recover it. */
9645         if (!lo || test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) ||
9646             !nfs4_stateid_match_other(&lgp->args.stateid, &lo->plh_stateid)) {
9647             spin_unlock(&inode->i_lock);
9648             exception->state = lgp->args.ctx->state;
9649             exception->stateid = &lgp->args.stateid;
9650             break;
9651         }
9652 
9653         /*
9654          * Mark the bad layout state as invalid, then retry
9655          */
9656         pnfs_mark_layout_stateid_invalid(lo, &head);
9657         spin_unlock(&inode->i_lock);
9658         nfs_commit_inode(inode, 0);
9659         pnfs_free_lseg_list(&head);
9660         status = -EAGAIN;
9661         goto out;
9662     }
9663 
9664     err = nfs4_handle_exception(server, nfs4err, exception);
9665     if (!status) {
9666         if (exception->retry)
9667             status = -EAGAIN;
9668         else
9669             status = err;
9670     }
9671 out:
9672     return status;
9673 }
9674 
9675 size_t max_response_pages(struct nfs_server *server)
9676 {
9677     u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
9678     return nfs_page_array_len(0, max_resp_sz);
9679 }
9680 
9681 static void nfs4_layoutget_release(void *calldata)
9682 {
9683     struct nfs4_layoutget *lgp = calldata;
9684 
9685     nfs4_sequence_free_slot(&lgp->res.seq_res);
9686     pnfs_layoutget_free(lgp);
9687 }
9688 
9689 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
9690     .rpc_call_prepare = nfs4_layoutget_prepare,
9691     .rpc_call_done = nfs4_layoutget_done,
9692     .rpc_release = nfs4_layoutget_release,
9693 };
9694 
9695 struct pnfs_layout_segment *
9696 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, long *timeout)
9697 {
9698     struct inode *inode = lgp->args.inode;
9699     struct nfs_server *server = NFS_SERVER(inode);
9700     struct rpc_task *task;
9701     struct rpc_message msg = {
9702         .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
9703         .rpc_argp = &lgp->args,
9704         .rpc_resp = &lgp->res,
9705         .rpc_cred = lgp->cred,
9706     };
9707     struct rpc_task_setup task_setup_data = {
9708         .rpc_client = server->client,
9709         .rpc_message = &msg,
9710         .callback_ops = &nfs4_layoutget_call_ops,
9711         .callback_data = lgp,
9712         .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF |
9713              RPC_TASK_MOVEABLE,
9714     };
9715     struct pnfs_layout_segment *lseg = NULL;
9716     struct nfs4_exception exception = {
9717         .inode = inode,
9718         .timeout = *timeout,
9719     };
9720     int status = 0;
9721 
9722     nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0, 0);
9723 
9724     task = rpc_run_task(&task_setup_data);
9725     if (IS_ERR(task))
9726         return ERR_CAST(task);
9727 
9728     status = rpc_wait_for_completion_task(task);
9729     if (status != 0)
9730         goto out;
9731 
9732     if (task->tk_status < 0) {
9733         status = nfs4_layoutget_handle_exception(task, lgp, &exception);
9734         *timeout = exception.timeout;
9735     } else if (lgp->res.layoutp->len == 0) {
9736         status = -EAGAIN;
9737         *timeout = nfs4_update_delay(&exception.timeout);
9738     } else
9739         lseg = pnfs_layout_process(lgp);
9740 out:
9741     trace_nfs4_layoutget(lgp->args.ctx,
9742             &lgp->args.range,
9743             &lgp->res.range,
9744             &lgp->res.stateid,
9745             status);
9746 
9747     rpc_put_task(task);
9748     dprintk("<-- %s status=%d\n", __func__, status);
9749     if (status)
9750         return ERR_PTR(status);
9751     return lseg;
9752 }
9753 
9754 static void
9755 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
9756 {
9757     struct nfs4_layoutreturn *lrp = calldata;
9758 
9759     nfs4_setup_sequence(lrp->clp,
9760             &lrp->args.seq_args,
9761             &lrp->res.seq_res,
9762             task);
9763     if (!pnfs_layout_is_valid(lrp->args.layout))
9764         rpc_exit(task, 0);
9765 }
9766 
9767 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
9768 {
9769     struct nfs4_layoutreturn *lrp = calldata;
9770     struct nfs_server *server;
9771 
9772     if (!nfs41_sequence_process(task, &lrp->res.seq_res))
9773         return;
9774 
9775     /*
9776      * Was there an RPC level error? Assume the call succeeded,
9777      * and that we need to release the layout
9778      */
9779     if (task->tk_rpc_status != 0 && RPC_WAS_SENT(task)) {
9780         lrp->res.lrs_present = 0;
9781         return;
9782     }
9783 
9784     server = NFS_SERVER(lrp->args.inode);
9785     switch (task->tk_status) {
9786     case -NFS4ERR_OLD_STATEID:
9787         if (nfs4_layout_refresh_old_stateid(&lrp->args.stateid,
9788                     &lrp->args.range,
9789                     lrp->args.inode))
9790             goto out_restart;
9791         fallthrough;
9792     default:
9793         task->tk_status = 0;
9794         fallthrough;
9795     case 0:
9796         break;
9797     case -NFS4ERR_DELAY:
9798         if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN)
9799             break;
9800         goto out_restart;
9801     }
9802     return;
9803 out_restart:
9804     task->tk_status = 0;
9805     nfs4_sequence_free_slot(&lrp->res.seq_res);
9806     rpc_restart_call_prepare(task);
9807 }
9808 
9809 static void nfs4_layoutreturn_release(void *calldata)
9810 {
9811     struct nfs4_layoutreturn *lrp = calldata;
9812     struct pnfs_layout_hdr *lo = lrp->args.layout;
9813 
9814     pnfs_layoutreturn_free_lsegs(lo, &lrp->args.stateid, &lrp->args.range,
9815             lrp->res.lrs_present ? &lrp->res.stateid : NULL);
9816     nfs4_sequence_free_slot(&lrp->res.seq_res);
9817     if (lrp->ld_private.ops && lrp->ld_private.ops->free)
9818         lrp->ld_private.ops->free(&lrp->ld_private);
9819     pnfs_put_layout_hdr(lrp->args.layout);
9820     nfs_iput_and_deactive(lrp->inode);
9821     put_cred(lrp->cred);
9822     kfree(calldata);
9823 }
9824 
9825 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
9826     .rpc_call_prepare = nfs4_layoutreturn_prepare,
9827     .rpc_call_done = nfs4_layoutreturn_done,
9828     .rpc_release = nfs4_layoutreturn_release,
9829 };
9830 
9831 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync)
9832 {
9833     struct rpc_task *task;
9834     struct rpc_message msg = {
9835         .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
9836         .rpc_argp = &lrp->args,
9837         .rpc_resp = &lrp->res,
9838         .rpc_cred = lrp->cred,
9839     };
9840     struct rpc_task_setup task_setup_data = {
9841         .rpc_client = NFS_SERVER(lrp->args.inode)->client,
9842         .rpc_message = &msg,
9843         .callback_ops = &nfs4_layoutreturn_call_ops,
9844         .callback_data = lrp,
9845         .flags = RPC_TASK_MOVEABLE,
9846     };
9847     int status = 0;
9848 
9849     nfs4_state_protect(NFS_SERVER(lrp->args.inode)->nfs_client,
9850             NFS_SP4_MACH_CRED_PNFS_CLEANUP,
9851             &task_setup_data.rpc_client, &msg);
9852 
9853     lrp->inode = nfs_igrab_and_active(lrp->args.inode);
9854     if (!sync) {
9855         if (!lrp->inode) {
9856             nfs4_layoutreturn_release(lrp);
9857             return -EAGAIN;
9858         }
9859         task_setup_data.flags |= RPC_TASK_ASYNC;
9860     }
9861     if (!lrp->inode)
9862         nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1,
9863                    1);
9864     else
9865         nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1,
9866                    0);
9867     task = rpc_run_task(&task_setup_data);
9868     if (IS_ERR(task))
9869         return PTR_ERR(task);
9870     if (sync)
9871         status = task->tk_status;
9872     trace_nfs4_layoutreturn(lrp->args.inode, &lrp->args.stateid, status);
9873     dprintk("<-- %s status=%d\n", __func__, status);
9874     rpc_put_task(task);
9875     return status;
9876 }
9877 
9878 static int
9879 _nfs4_proc_getdeviceinfo(struct nfs_server *server,
9880         struct pnfs_device *pdev,
9881         const struct cred *cred)
9882 {
9883     struct nfs4_getdeviceinfo_args args = {
9884         .pdev = pdev,
9885         .notify_types = NOTIFY_DEVICEID4_CHANGE |
9886             NOTIFY_DEVICEID4_DELETE,
9887     };
9888     struct nfs4_getdeviceinfo_res res = {
9889         .pdev = pdev,
9890     };
9891     struct rpc_message msg = {
9892         .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
9893         .rpc_argp = &args,
9894         .rpc_resp = &res,
9895         .rpc_cred = cred,
9896     };
9897     int status;
9898 
9899     status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
9900     if (res.notification & ~args.notify_types)
9901         dprintk("%s: unsupported notification\n", __func__);
9902     if (res.notification != args.notify_types)
9903         pdev->nocache = 1;
9904 
9905     trace_nfs4_getdeviceinfo(server, &pdev->dev_id, status);
9906 
9907     dprintk("<-- %s status=%d\n", __func__, status);
9908 
9909     return status;
9910 }
9911 
9912 int nfs4_proc_getdeviceinfo(struct nfs_server *server,
9913         struct pnfs_device *pdev,
9914         const struct cred *cred)
9915 {
9916     struct nfs4_exception exception = { };
9917     int err;
9918 
9919     do {
9920         err = nfs4_handle_exception(server,
9921                     _nfs4_proc_getdeviceinfo(server, pdev, cred),
9922                     &exception);
9923     } while (exception.retry);
9924     return err;
9925 }
9926 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
9927 
9928 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
9929 {
9930     struct nfs4_layoutcommit_data *data = calldata;
9931     struct nfs_server *server = NFS_SERVER(data->args.inode);
9932 
9933     nfs4_setup_sequence(server->nfs_client,
9934             &data->args.seq_args,
9935             &data->res.seq_res,
9936             task);
9937 }
9938 
9939 static void
9940 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
9941 {
9942     struct nfs4_layoutcommit_data *data = calldata;
9943     struct nfs_server *server = NFS_SERVER(data->args.inode);
9944 
9945     if (!nfs41_sequence_done(task, &data->res.seq_res))
9946         return;
9947 
9948     switch (task->tk_status) { /* Just ignore these failures */
9949     case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
9950     case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
9951     case -NFS4ERR_BADLAYOUT:     /* no layout */
9952     case -NFS4ERR_GRACE:        /* loca_recalim always false */
9953         task->tk_status = 0;
9954         break;
9955     case 0:
9956         break;
9957     default:
9958         if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) {
9959             rpc_restart_call_prepare(task);
9960             return;
9961         }
9962     }
9963 }
9964 
9965 static void nfs4_layoutcommit_release(void *calldata)
9966 {
9967     struct nfs4_layoutcommit_data *data = calldata;
9968 
9969     pnfs_cleanup_layoutcommit(data);
9970     nfs_post_op_update_inode_force_wcc(data->args.inode,
9971                        data->res.fattr);
9972     put_cred(data->cred);
9973     nfs_iput_and_deactive(data->inode);
9974     kfree(data);
9975 }
9976 
9977 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
9978     .rpc_call_prepare = nfs4_layoutcommit_prepare,
9979     .rpc_call_done = nfs4_layoutcommit_done,
9980     .rpc_release = nfs4_layoutcommit_release,
9981 };
9982 
9983 int
9984 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
9985 {
9986     struct rpc_message msg = {
9987         .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
9988         .rpc_argp = &data->args,
9989         .rpc_resp = &data->res,
9990         .rpc_cred = data->cred,
9991     };
9992     struct rpc_task_setup task_setup_data = {
9993         .task = &data->task,
9994         .rpc_client = NFS_CLIENT(data->args.inode),
9995         .rpc_message = &msg,
9996         .callback_ops = &nfs4_layoutcommit_ops,
9997         .callback_data = data,
9998         .flags = RPC_TASK_MOVEABLE,
9999     };
10000     struct rpc_task *task;
10001     int status = 0;
10002 
10003     dprintk("NFS: initiating layoutcommit call. sync %d "
10004         "lbw: %llu inode %lu\n", sync,
10005         data->args.lastbytewritten,
10006         data->args.inode->i_ino);
10007 
10008     if (!sync) {
10009         data->inode = nfs_igrab_and_active(data->args.inode);
10010         if (data->inode == NULL) {
10011             nfs4_layoutcommit_release(data);
10012             return -EAGAIN;
10013         }
10014         task_setup_data.flags = RPC_TASK_ASYNC;
10015     }
10016     nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0);
10017     task = rpc_run_task(&task_setup_data);
10018     if (IS_ERR(task))
10019         return PTR_ERR(task);
10020     if (sync)
10021         status = task->tk_status;
10022     trace_nfs4_layoutcommit(data->args.inode, &data->args.stateid, status);
10023     dprintk("%s: status %d\n", __func__, status);
10024     rpc_put_task(task);
10025     return status;
10026 }
10027 
10028 /*
10029  * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
10030  * possible) as per RFC3530bis and RFC5661 Security Considerations sections
10031  */
10032 static int
10033 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
10034             struct nfs_fsinfo *info,
10035             struct nfs4_secinfo_flavors *flavors, bool use_integrity)
10036 {
10037     struct nfs41_secinfo_no_name_args args = {
10038         .style = SECINFO_STYLE_CURRENT_FH,
10039     };
10040     struct nfs4_secinfo_res res = {
10041         .flavors = flavors,
10042     };
10043     struct rpc_message msg = {
10044         .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
10045         .rpc_argp = &args,
10046         .rpc_resp = &res,
10047     };
10048     struct nfs4_call_sync_data data = {
10049         .seq_server = server,
10050         .seq_args = &args.seq_args,
10051         .seq_res = &res.seq_res,
10052     };
10053     struct rpc_task_setup task_setup = {
10054         .rpc_client = server->client,
10055         .rpc_message = &msg,
10056         .callback_ops = server->nfs_client->cl_mvops->call_sync_ops,
10057         .callback_data = &data,
10058         .flags = RPC_TASK_NO_ROUND_ROBIN,
10059     };
10060     const struct cred *cred = NULL;
10061     int status;
10062 
10063     if (use_integrity) {
10064         task_setup.rpc_client = server->nfs_client->cl_rpcclient;
10065 
10066         cred = nfs4_get_clid_cred(server->nfs_client);
10067         msg.rpc_cred = cred;
10068     }
10069 
10070     nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
10071     status = nfs4_call_sync_custom(&task_setup);
10072     dprintk("<-- %s status=%d\n", __func__, status);
10073 
10074     put_cred(cred);
10075 
10076     return status;
10077 }
10078 
10079 static int
10080 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
10081                struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
10082 {
10083     struct nfs4_exception exception = {
10084         .interruptible = true,
10085     };
10086     int err;
10087     do {
10088         /* first try using integrity protection */
10089         err = -NFS4ERR_WRONGSEC;
10090 
10091         /* try to use integrity protection with machine cred */
10092         if (_nfs4_is_integrity_protected(server->nfs_client))
10093             err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
10094                               flavors, true);
10095 
10096         /*
10097          * if unable to use integrity protection, or SECINFO with
10098          * integrity protection returns NFS4ERR_WRONGSEC (which is
10099          * disallowed by spec, but exists in deployed servers) use
10100          * the current filesystem's rpc_client and the user cred.
10101          */
10102         if (err == -NFS4ERR_WRONGSEC)
10103             err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
10104                               flavors, false);
10105 
10106         switch (err) {
10107         case 0:
10108         case -NFS4ERR_WRONGSEC:
10109         case -ENOTSUPP:
10110             goto out;
10111         default:
10112             err = nfs4_handle_exception(server, err, &exception);
10113         }
10114     } while (exception.retry);
10115 out:
10116     return err;
10117 }
10118 
10119 static int
10120 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
10121             struct nfs_fsinfo *info)
10122 {
10123     int err;
10124     struct page *page;
10125     rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
10126     struct nfs4_secinfo_flavors *flavors;
10127     struct nfs4_secinfo4 *secinfo;
10128     int i;
10129 
10130     page = alloc_page(GFP_KERNEL);
10131     if (!page) {
10132         err = -ENOMEM;
10133         goto out;
10134     }
10135 
10136     flavors = page_address(page);
10137     err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
10138 
10139     /*
10140      * Fall back on "guess and check" method if
10141      * the server doesn't support SECINFO_NO_NAME
10142      */
10143     if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) {
10144         err = nfs4_find_root_sec(server, fhandle, info);
10145         goto out_freepage;
10146     }
10147     if (err)
10148         goto out_freepage;
10149 
10150     for (i = 0; i < flavors->num_flavors; i++) {
10151         secinfo = &flavors->flavors[i];
10152 
10153         switch (secinfo->flavor) {
10154         case RPC_AUTH_NULL:
10155         case RPC_AUTH_UNIX:
10156         case RPC_AUTH_GSS:
10157             flavor = rpcauth_get_pseudoflavor(secinfo->flavor,
10158                     &secinfo->flavor_info);
10159             break;
10160         default:
10161             flavor = RPC_AUTH_MAXFLAVOR;
10162             break;
10163         }
10164 
10165         if (!nfs_auth_info_match(&server->auth_info, flavor))
10166             flavor = RPC_AUTH_MAXFLAVOR;
10167 
10168         if (flavor != RPC_AUTH_MAXFLAVOR) {
10169             err = nfs4_lookup_root_sec(server, fhandle,
10170                            info, flavor);
10171             if (!err)
10172                 break;
10173         }
10174     }
10175 
10176     if (flavor == RPC_AUTH_MAXFLAVOR)
10177         err = -EPERM;
10178 
10179 out_freepage:
10180     put_page(page);
10181     if (err == -EACCES)
10182         return -EPERM;
10183 out:
10184     return err;
10185 }
10186 
10187 static int _nfs41_test_stateid(struct nfs_server *server,
10188         nfs4_stateid *stateid,
10189         const struct cred *cred)
10190 {
10191     int status;
10192     struct nfs41_test_stateid_args args = {
10193         .stateid = stateid,
10194     };
10195     struct nfs41_test_stateid_res res;
10196     struct rpc_message msg = {
10197         .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
10198         .rpc_argp = &args,
10199         .rpc_resp = &res,
10200         .rpc_cred = cred,
10201     };
10202     struct rpc_clnt *rpc_client = server->client;
10203 
10204     nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
10205         &rpc_client, &msg);
10206 
10207     dprintk("NFS call  test_stateid %p\n", stateid);
10208     nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
10209     status = nfs4_call_sync_sequence(rpc_client, server, &msg,
10210             &args.seq_args, &res.seq_res);
10211     if (status != NFS_OK) {
10212         dprintk("NFS reply test_stateid: failed, %d\n", status);
10213         return status;
10214     }
10215     dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
10216     return -res.status;
10217 }
10218 
10219 static void nfs4_handle_delay_or_session_error(struct nfs_server *server,
10220         int err, struct nfs4_exception *exception)
10221 {
10222     exception->retry = 0;
10223     switch(err) {
10224     case -NFS4ERR_DELAY:
10225     case -NFS4ERR_RETRY_UNCACHED_REP:
10226         nfs4_handle_exception(server, err, exception);
10227         break;
10228     case -NFS4ERR_BADSESSION:
10229     case -NFS4ERR_BADSLOT:
10230     case -NFS4ERR_BAD_HIGH_SLOT:
10231     case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
10232     case -NFS4ERR_DEADSESSION:
10233         nfs4_do_handle_exception(server, err, exception);
10234     }
10235 }
10236 
10237 /**
10238  * nfs41_test_stateid - perform a TEST_STATEID operation
10239  *
10240  * @server: server / transport on which to perform the operation
10241  * @stateid: state ID to test
10242  * @cred: credential
10243  *
10244  * Returns NFS_OK if the server recognizes that "stateid" is valid.
10245  * Otherwise a negative NFS4ERR value is returned if the operation
10246  * failed or the state ID is not currently valid.
10247  */
10248 static int nfs41_test_stateid(struct nfs_server *server,
10249         nfs4_stateid *stateid,
10250         const struct cred *cred)
10251 {
10252     struct nfs4_exception exception = {
10253         .interruptible = true,
10254     };
10255     int err;
10256     do {
10257         err = _nfs41_test_stateid(server, stateid, cred);
10258         nfs4_handle_delay_or_session_error(server, err, &exception);
10259     } while (exception.retry);
10260     return err;
10261 }
10262 
10263 struct nfs_free_stateid_data {
10264     struct nfs_server *server;
10265     struct nfs41_free_stateid_args args;
10266     struct nfs41_free_stateid_res res;
10267 };
10268 
10269 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
10270 {
10271     struct nfs_free_stateid_data *data = calldata;
10272     nfs4_setup_sequence(data->server->nfs_client,
10273             &data->args.seq_args,
10274             &data->res.seq_res,
10275             task);
10276 }
10277 
10278 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
10279 {
10280     struct nfs_free_stateid_data *data = calldata;
10281 
10282     nfs41_sequence_done(task, &data->res.seq_res);
10283 
10284     switch (task->tk_status) {
10285     case -NFS4ERR_DELAY:
10286         if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN)
10287             rpc_restart_call_prepare(task);
10288     }
10289 }
10290 
10291 static void nfs41_free_stateid_release(void *calldata)
10292 {
10293     struct nfs_free_stateid_data *data = calldata;
10294     struct nfs_client *clp = data->server->nfs_client;
10295 
10296     nfs_put_client(clp);
10297     kfree(calldata);
10298 }
10299 
10300 static const struct rpc_call_ops nfs41_free_stateid_ops = {
10301     .rpc_call_prepare = nfs41_free_stateid_prepare,
10302     .rpc_call_done = nfs41_free_stateid_done,
10303     .rpc_release = nfs41_free_stateid_release,
10304 };
10305 
10306 /**
10307  * nfs41_free_stateid - perform a FREE_STATEID operation
10308  *
10309  * @server: server / transport on which to perform the operation
10310  * @stateid: state ID to release
10311  * @cred: credential
10312  * @privileged: set to true if this call needs to be privileged
10313  *
10314  * Note: this function is always asynchronous.
10315  */
10316 static int nfs41_free_stateid(struct nfs_server *server,
10317         const nfs4_stateid *stateid,
10318         const struct cred *cred,
10319         bool privileged)
10320 {
10321     struct rpc_message msg = {
10322         .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
10323         .rpc_cred = cred,
10324     };
10325     struct rpc_task_setup task_setup = {
10326         .rpc_client = server->client,
10327         .rpc_message = &msg,
10328         .callback_ops = &nfs41_free_stateid_ops,
10329         .flags = RPC_TASK_ASYNC | RPC_TASK_MOVEABLE,
10330     };
10331     struct nfs_free_stateid_data *data;
10332     struct rpc_task *task;
10333     struct nfs_client *clp = server->nfs_client;
10334 
10335     if (!refcount_inc_not_zero(&clp->cl_count))
10336         return -EIO;
10337 
10338     nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
10339         &task_setup.rpc_client, &msg);
10340 
10341     dprintk("NFS call  free_stateid %p\n", stateid);
10342     data = kmalloc(sizeof(*data), GFP_KERNEL);
10343     if (!data)
10344         return -ENOMEM;
10345     data->server = server;
10346     nfs4_stateid_copy(&data->args.stateid, stateid);
10347 
10348     task_setup.callback_data = data;
10349 
10350     msg.rpc_argp = &data->args;
10351     msg.rpc_resp = &data->res;
10352     nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, privileged);
10353     task = rpc_run_task(&task_setup);
10354     if (IS_ERR(task))
10355         return PTR_ERR(task);
10356     rpc_put_task(task);
10357     return 0;
10358 }
10359 
10360 static void
10361 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
10362 {
10363     const struct cred *cred = lsp->ls_state->owner->so_cred;
10364 
10365     nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
10366     nfs4_free_lock_state(server, lsp);
10367 }
10368 
10369 static bool nfs41_match_stateid(const nfs4_stateid *s1,
10370         const nfs4_stateid *s2)
10371 {
10372     if (s1->type != s2->type)
10373         return false;
10374 
10375     if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
10376         return false;
10377 
10378     if (s1->seqid == s2->seqid)
10379         return true;
10380 
10381     return s1->seqid == 0 || s2->seqid == 0;
10382 }
10383 
10384 #endif /* CONFIG_NFS_V4_1 */
10385 
10386 static bool nfs4_match_stateid(const nfs4_stateid *s1,
10387         const nfs4_stateid *s2)
10388 {
10389     return nfs4_stateid_match(s1, s2);
10390 }
10391 
10392 
10393 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
10394     .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
10395     .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
10396     .recover_open   = nfs4_open_reclaim,
10397     .recover_lock   = nfs4_lock_reclaim,
10398     .establish_clid = nfs4_init_clientid,
10399     .detect_trunking = nfs40_discover_server_trunking,
10400 };
10401 
10402 #if defined(CONFIG_NFS_V4_1)
10403 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
10404     .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
10405     .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
10406     .recover_open   = nfs4_open_reclaim,
10407     .recover_lock   = nfs4_lock_reclaim,
10408     .establish_clid = nfs41_init_clientid,
10409     .reclaim_complete = nfs41_proc_reclaim_complete,
10410     .detect_trunking = nfs41_discover_server_trunking,
10411 };
10412 #endif /* CONFIG_NFS_V4_1 */
10413 
10414 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
10415     .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
10416     .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
10417     .recover_open   = nfs40_open_expired,
10418     .recover_lock   = nfs4_lock_expired,
10419     .establish_clid = nfs4_init_clientid,
10420 };
10421 
10422 #if defined(CONFIG_NFS_V4_1)
10423 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
10424     .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
10425     .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
10426     .recover_open   = nfs41_open_expired,
10427     .recover_lock   = nfs41_lock_expired,
10428     .establish_clid = nfs41_init_clientid,
10429 };
10430 #endif /* CONFIG_NFS_V4_1 */
10431 
10432 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
10433     .sched_state_renewal = nfs4_proc_async_renew,
10434     .get_state_renewal_cred = nfs4_get_renew_cred,
10435     .renew_lease = nfs4_proc_renew,
10436 };
10437 
10438 #if defined(CONFIG_NFS_V4_1)
10439 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
10440     .sched_state_renewal = nfs41_proc_async_sequence,
10441     .get_state_renewal_cred = nfs4_get_machine_cred,
10442     .renew_lease = nfs4_proc_sequence,
10443 };
10444 #endif
10445 
10446 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = {
10447     .get_locations = _nfs40_proc_get_locations,
10448     .fsid_present = _nfs40_proc_fsid_present,
10449 };
10450 
10451 #if defined(CONFIG_NFS_V4_1)
10452 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = {
10453     .get_locations = _nfs41_proc_get_locations,
10454     .fsid_present = _nfs41_proc_fsid_present,
10455 };
10456 #endif  /* CONFIG_NFS_V4_1 */
10457 
10458 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
10459     .minor_version = 0,
10460     .init_caps = NFS_CAP_READDIRPLUS
10461         | NFS_CAP_ATOMIC_OPEN
10462         | NFS_CAP_POSIX_LOCK,
10463     .init_client = nfs40_init_client,
10464     .shutdown_client = nfs40_shutdown_client,
10465     .match_stateid = nfs4_match_stateid,
10466     .find_root_sec = nfs4_find_root_sec,
10467     .free_lock_state = nfs4_release_lockowner,
10468     .test_and_free_expired = nfs40_test_and_free_expired_stateid,
10469     .alloc_seqid = nfs_alloc_seqid,
10470     .call_sync_ops = &nfs40_call_sync_ops,
10471     .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
10472     .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
10473     .state_renewal_ops = &nfs40_state_renewal_ops,
10474     .mig_recovery_ops = &nfs40_mig_recovery_ops,
10475 };
10476 
10477 #if defined(CONFIG_NFS_V4_1)
10478 static struct nfs_seqid *
10479 nfs_alloc_no_seqid(struct nfs_seqid_counter *arg1, gfp_t arg2)
10480 {
10481     return NULL;
10482 }
10483 
10484 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
10485     .minor_version = 1,
10486     .init_caps = NFS_CAP_READDIRPLUS
10487         | NFS_CAP_ATOMIC_OPEN
10488         | NFS_CAP_POSIX_LOCK
10489         | NFS_CAP_STATEID_NFSV41
10490         | NFS_CAP_ATOMIC_OPEN_V1
10491         | NFS_CAP_LGOPEN
10492         | NFS_CAP_MOVEABLE,
10493     .init_client = nfs41_init_client,
10494     .shutdown_client = nfs41_shutdown_client,
10495     .match_stateid = nfs41_match_stateid,
10496     .find_root_sec = nfs41_find_root_sec,
10497     .free_lock_state = nfs41_free_lock_state,
10498     .test_and_free_expired = nfs41_test_and_free_expired_stateid,
10499     .alloc_seqid = nfs_alloc_no_seqid,
10500     .session_trunk = nfs4_test_session_trunk,
10501     .call_sync_ops = &nfs41_call_sync_ops,
10502     .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
10503     .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
10504     .state_renewal_ops = &nfs41_state_renewal_ops,
10505     .mig_recovery_ops = &nfs41_mig_recovery_ops,
10506 };
10507 #endif
10508 
10509 #if defined(CONFIG_NFS_V4_2)
10510 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
10511     .minor_version = 2,
10512     .init_caps = NFS_CAP_READDIRPLUS
10513         | NFS_CAP_ATOMIC_OPEN
10514         | NFS_CAP_POSIX_LOCK
10515         | NFS_CAP_STATEID_NFSV41
10516         | NFS_CAP_ATOMIC_OPEN_V1
10517         | NFS_CAP_LGOPEN
10518         | NFS_CAP_ALLOCATE
10519         | NFS_CAP_COPY
10520         | NFS_CAP_OFFLOAD_CANCEL
10521         | NFS_CAP_COPY_NOTIFY
10522         | NFS_CAP_DEALLOCATE
10523         | NFS_CAP_SEEK
10524         | NFS_CAP_LAYOUTSTATS
10525         | NFS_CAP_CLONE
10526         | NFS_CAP_LAYOUTERROR
10527         | NFS_CAP_READ_PLUS
10528         | NFS_CAP_MOVEABLE,
10529     .init_client = nfs41_init_client,
10530     .shutdown_client = nfs41_shutdown_client,
10531     .match_stateid = nfs41_match_stateid,
10532     .find_root_sec = nfs41_find_root_sec,
10533     .free_lock_state = nfs41_free_lock_state,
10534     .call_sync_ops = &nfs41_call_sync_ops,
10535     .test_and_free_expired = nfs41_test_and_free_expired_stateid,
10536     .alloc_seqid = nfs_alloc_no_seqid,
10537     .session_trunk = nfs4_test_session_trunk,
10538     .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
10539     .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
10540     .state_renewal_ops = &nfs41_state_renewal_ops,
10541     .mig_recovery_ops = &nfs41_mig_recovery_ops,
10542 };
10543 #endif
10544 
10545 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
10546     [0] = &nfs_v4_0_minor_ops,
10547 #if defined(CONFIG_NFS_V4_1)
10548     [1] = &nfs_v4_1_minor_ops,
10549 #endif
10550 #if defined(CONFIG_NFS_V4_2)
10551     [2] = &nfs_v4_2_minor_ops,
10552 #endif
10553 };
10554 
10555 static ssize_t nfs4_listxattr(struct dentry *dentry, char *list, size_t size)
10556 {
10557     ssize_t error, error2, error3;
10558 
10559     error = generic_listxattr(dentry, list, size);
10560     if (error < 0)
10561         return error;
10562     if (list) {
10563         list += error;
10564         size -= error;
10565     }
10566 
10567     error2 = nfs4_listxattr_nfs4_label(d_inode(dentry), list, size);
10568     if (error2 < 0)
10569         return error2;
10570 
10571     if (list) {
10572         list += error2;
10573         size -= error2;
10574     }
10575 
10576     error3 = nfs4_listxattr_nfs4_user(d_inode(dentry), list, size);
10577     if (error3 < 0)
10578         return error3;
10579 
10580     return error + error2 + error3;
10581 }
10582 
10583 static void nfs4_enable_swap(struct inode *inode)
10584 {
10585     /* The state manager thread must always be running.
10586      * It will notice the client is a swapper, and stay put.
10587      */
10588     struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
10589 
10590     nfs4_schedule_state_manager(clp);
10591 }
10592 
10593 static void nfs4_disable_swap(struct inode *inode)
10594 {
10595     /* The state manager thread will now exit once it is
10596      * woken.
10597      */
10598     wake_up_var(&NFS_SERVER(inode)->nfs_client->cl_state);
10599 }
10600 
10601 static const struct inode_operations nfs4_dir_inode_operations = {
10602     .create     = nfs_create,
10603     .lookup     = nfs_lookup,
10604     .atomic_open    = nfs_atomic_open,
10605     .link       = nfs_link,
10606     .unlink     = nfs_unlink,
10607     .symlink    = nfs_symlink,
10608     .mkdir      = nfs_mkdir,
10609     .rmdir      = nfs_rmdir,
10610     .mknod      = nfs_mknod,
10611     .rename     = nfs_rename,
10612     .permission = nfs_permission,
10613     .getattr    = nfs_getattr,
10614     .setattr    = nfs_setattr,
10615     .listxattr  = nfs4_listxattr,
10616 };
10617 
10618 static const struct inode_operations nfs4_file_inode_operations = {
10619     .permission = nfs_permission,
10620     .getattr    = nfs_getattr,
10621     .setattr    = nfs_setattr,
10622     .listxattr  = nfs4_listxattr,
10623 };
10624 
10625 const struct nfs_rpc_ops nfs_v4_clientops = {
10626     .version    = 4,            /* protocol version */
10627     .dentry_ops = &nfs4_dentry_operations,
10628     .dir_inode_ops  = &nfs4_dir_inode_operations,
10629     .file_inode_ops = &nfs4_file_inode_operations,
10630     .file_ops   = &nfs4_file_operations,
10631     .getroot    = nfs4_proc_get_root,
10632     .submount   = nfs4_submount,
10633     .try_get_tree   = nfs4_try_get_tree,
10634     .getattr    = nfs4_proc_getattr,
10635     .setattr    = nfs4_proc_setattr,
10636     .lookup     = nfs4_proc_lookup,
10637     .lookupp    = nfs4_proc_lookupp,
10638     .access     = nfs4_proc_access,
10639     .readlink   = nfs4_proc_readlink,
10640     .create     = nfs4_proc_create,
10641     .remove     = nfs4_proc_remove,
10642     .unlink_setup   = nfs4_proc_unlink_setup,
10643     .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
10644     .unlink_done    = nfs4_proc_unlink_done,
10645     .rename_setup   = nfs4_proc_rename_setup,
10646     .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
10647     .rename_done    = nfs4_proc_rename_done,
10648     .link       = nfs4_proc_link,
10649     .symlink    = nfs4_proc_symlink,
10650     .mkdir      = nfs4_proc_mkdir,
10651     .rmdir      = nfs4_proc_rmdir,
10652     .readdir    = nfs4_proc_readdir,
10653     .mknod      = nfs4_proc_mknod,
10654     .statfs     = nfs4_proc_statfs,
10655     .fsinfo     = nfs4_proc_fsinfo,
10656     .pathconf   = nfs4_proc_pathconf,
10657     .set_capabilities = nfs4_server_capabilities,
10658     .decode_dirent  = nfs4_decode_dirent,
10659     .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare,
10660     .read_setup = nfs4_proc_read_setup,
10661     .read_done  = nfs4_read_done,
10662     .write_setup    = nfs4_proc_write_setup,
10663     .write_done = nfs4_write_done,
10664     .commit_setup   = nfs4_proc_commit_setup,
10665     .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
10666     .commit_done    = nfs4_commit_done,
10667     .lock       = nfs4_proc_lock,
10668     .clear_acl_cache = nfs4_zap_acl_attr,
10669     .close_context  = nfs4_close_context,
10670     .open_context   = nfs4_atomic_open,
10671     .have_delegation = nfs4_have_delegation,
10672     .alloc_client   = nfs4_alloc_client,
10673     .init_client    = nfs4_init_client,
10674     .free_client    = nfs4_free_client,
10675     .create_server  = nfs4_create_server,
10676     .clone_server   = nfs_clone_server,
10677     .discover_trunking = nfs4_discover_trunking,
10678     .enable_swap    = nfs4_enable_swap,
10679     .disable_swap   = nfs4_disable_swap,
10680 };
10681 
10682 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
10683     .name   = XATTR_NAME_NFSV4_ACL,
10684     .list   = nfs4_xattr_list_nfs4_acl,
10685     .get    = nfs4_xattr_get_nfs4_acl,
10686     .set    = nfs4_xattr_set_nfs4_acl,
10687 };
10688 
10689 #if defined(CONFIG_NFS_V4_1)
10690 static const struct xattr_handler nfs4_xattr_nfs4_dacl_handler = {
10691     .name   = XATTR_NAME_NFSV4_DACL,
10692     .list   = nfs4_xattr_list_nfs4_dacl,
10693     .get    = nfs4_xattr_get_nfs4_dacl,
10694     .set    = nfs4_xattr_set_nfs4_dacl,
10695 };
10696 
10697 static const struct xattr_handler nfs4_xattr_nfs4_sacl_handler = {
10698     .name   = XATTR_NAME_NFSV4_SACL,
10699     .list   = nfs4_xattr_list_nfs4_sacl,
10700     .get    = nfs4_xattr_get_nfs4_sacl,
10701     .set    = nfs4_xattr_set_nfs4_sacl,
10702 };
10703 #endif
10704 
10705 #ifdef CONFIG_NFS_V4_2
10706 static const struct xattr_handler nfs4_xattr_nfs4_user_handler = {
10707     .prefix = XATTR_USER_PREFIX,
10708     .get    = nfs4_xattr_get_nfs4_user,
10709     .set    = nfs4_xattr_set_nfs4_user,
10710 };
10711 #endif
10712 
10713 const struct xattr_handler *nfs4_xattr_handlers[] = {
10714     &nfs4_xattr_nfs4_acl_handler,
10715 #if defined(CONFIG_NFS_V4_1)
10716     &nfs4_xattr_nfs4_dacl_handler,
10717     &nfs4_xattr_nfs4_sacl_handler,
10718 #endif
10719 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
10720     &nfs4_xattr_nfs4_label_handler,
10721 #endif
10722 #ifdef CONFIG_NFS_V4_2
10723     &nfs4_xattr_nfs4_user_handler,
10724 #endif
10725     NULL
10726 };
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