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0001 // SPDX-License-Identifier: GPL-2.0
0002 /*
0003  * linux/fs/nfs/callback_proc.c
0004  *
0005  * Copyright (C) 2004 Trond Myklebust
0006  *
0007  * NFSv4 callback procedures
0008  */
0009 
0010 #include <linux/errno.h>
0011 #include <linux/math.h>
0012 #include <linux/nfs4.h>
0013 #include <linux/nfs_fs.h>
0014 #include <linux/slab.h>
0015 #include <linux/rcupdate.h>
0016 #include <linux/types.h>
0017 
0018 #include "nfs4_fs.h"
0019 #include "callback.h"
0020 #include "delegation.h"
0021 #include "internal.h"
0022 #include "pnfs.h"
0023 #include "nfs4session.h"
0024 #include "nfs4trace.h"
0025 
0026 #define NFSDBG_FACILITY NFSDBG_CALLBACK
0027 
0028 __be32 nfs4_callback_getattr(void *argp, void *resp,
0029                  struct cb_process_state *cps)
0030 {
0031     struct cb_getattrargs *args = argp;
0032     struct cb_getattrres *res = resp;
0033     struct nfs_delegation *delegation;
0034     struct inode *inode;
0035 
0036     res->status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
0037     if (!cps->clp) /* Always set for v4.0. Set in cb_sequence for v4.1 */
0038         goto out;
0039 
0040     res->bitmap[0] = res->bitmap[1] = 0;
0041     res->status = htonl(NFS4ERR_BADHANDLE);
0042 
0043     dprintk_rcu("NFS: GETATTR callback request from %s\n",
0044         rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
0045 
0046     inode = nfs_delegation_find_inode(cps->clp, &args->fh);
0047     if (IS_ERR(inode)) {
0048         if (inode == ERR_PTR(-EAGAIN))
0049             res->status = htonl(NFS4ERR_DELAY);
0050         trace_nfs4_cb_getattr(cps->clp, &args->fh, NULL,
0051                 -ntohl(res->status));
0052         goto out;
0053     }
0054     rcu_read_lock();
0055     delegation = nfs4_get_valid_delegation(inode);
0056     if (delegation == NULL || (delegation->type & FMODE_WRITE) == 0)
0057         goto out_iput;
0058     res->size = i_size_read(inode);
0059     res->change_attr = delegation->change_attr;
0060     if (nfs_have_writebacks(inode))
0061         res->change_attr++;
0062     res->ctime = inode->i_ctime;
0063     res->mtime = inode->i_mtime;
0064     res->bitmap[0] = (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE) &
0065         args->bitmap[0];
0066     res->bitmap[1] = (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY) &
0067         args->bitmap[1];
0068     res->status = 0;
0069 out_iput:
0070     rcu_read_unlock();
0071     trace_nfs4_cb_getattr(cps->clp, &args->fh, inode, -ntohl(res->status));
0072     nfs_iput_and_deactive(inode);
0073 out:
0074     dprintk("%s: exit with status = %d\n", __func__, ntohl(res->status));
0075     return res->status;
0076 }
0077 
0078 __be32 nfs4_callback_recall(void *argp, void *resp,
0079                 struct cb_process_state *cps)
0080 {
0081     struct cb_recallargs *args = argp;
0082     struct inode *inode;
0083     __be32 res;
0084     
0085     res = htonl(NFS4ERR_OP_NOT_IN_SESSION);
0086     if (!cps->clp) /* Always set for v4.0. Set in cb_sequence for v4.1 */
0087         goto out;
0088 
0089     dprintk_rcu("NFS: RECALL callback request from %s\n",
0090         rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
0091 
0092     res = htonl(NFS4ERR_BADHANDLE);
0093     inode = nfs_delegation_find_inode(cps->clp, &args->fh);
0094     if (IS_ERR(inode)) {
0095         if (inode == ERR_PTR(-EAGAIN))
0096             res = htonl(NFS4ERR_DELAY);
0097         trace_nfs4_cb_recall(cps->clp, &args->fh, NULL,
0098                 &args->stateid, -ntohl(res));
0099         goto out;
0100     }
0101     /* Set up a helper thread to actually return the delegation */
0102     switch (nfs_async_inode_return_delegation(inode, &args->stateid)) {
0103     case 0:
0104         res = 0;
0105         break;
0106     case -ENOENT:
0107         res = htonl(NFS4ERR_BAD_STATEID);
0108         break;
0109     default:
0110         res = htonl(NFS4ERR_RESOURCE);
0111     }
0112     trace_nfs4_cb_recall(cps->clp, &args->fh, inode,
0113             &args->stateid, -ntohl(res));
0114     nfs_iput_and_deactive(inode);
0115 out:
0116     dprintk("%s: exit with status = %d\n", __func__, ntohl(res));
0117     return res;
0118 }
0119 
0120 #if defined(CONFIG_NFS_V4_1)
0121 
0122 /*
0123  * Lookup a layout inode by stateid
0124  *
0125  * Note: returns a refcount on the inode and superblock
0126  */
0127 static struct inode *nfs_layout_find_inode_by_stateid(struct nfs_client *clp,
0128         const nfs4_stateid *stateid)
0129     __must_hold(RCU)
0130 {
0131     struct nfs_server *server;
0132     struct inode *inode;
0133     struct pnfs_layout_hdr *lo;
0134 
0135     rcu_read_lock();
0136     list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
0137         list_for_each_entry_rcu(lo, &server->layouts, plh_layouts) {
0138             if (!pnfs_layout_is_valid(lo))
0139                 continue;
0140             if (!nfs4_stateid_match_other(stateid, &lo->plh_stateid))
0141                 continue;
0142             if (nfs_sb_active(server->super))
0143                 inode = igrab(lo->plh_inode);
0144             else
0145                 inode = ERR_PTR(-EAGAIN);
0146             rcu_read_unlock();
0147             if (inode)
0148                 return inode;
0149             nfs_sb_deactive(server->super);
0150             return ERR_PTR(-EAGAIN);
0151         }
0152     }
0153     rcu_read_unlock();
0154     return ERR_PTR(-ENOENT);
0155 }
0156 
0157 /*
0158  * Lookup a layout inode by filehandle.
0159  *
0160  * Note: returns a refcount on the inode and superblock
0161  *
0162  */
0163 static struct inode *nfs_layout_find_inode_by_fh(struct nfs_client *clp,
0164         const struct nfs_fh *fh)
0165 {
0166     struct nfs_server *server;
0167     struct nfs_inode *nfsi;
0168     struct inode *inode;
0169     struct pnfs_layout_hdr *lo;
0170 
0171     rcu_read_lock();
0172     list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
0173         list_for_each_entry_rcu(lo, &server->layouts, plh_layouts) {
0174             nfsi = NFS_I(lo->plh_inode);
0175             if (nfs_compare_fh(fh, &nfsi->fh))
0176                 continue;
0177             if (nfsi->layout != lo)
0178                 continue;
0179             if (nfs_sb_active(server->super))
0180                 inode = igrab(lo->plh_inode);
0181             else
0182                 inode = ERR_PTR(-EAGAIN);
0183             rcu_read_unlock();
0184             if (inode)
0185                 return inode;
0186             nfs_sb_deactive(server->super);
0187             return ERR_PTR(-EAGAIN);
0188         }
0189     }
0190     rcu_read_unlock();
0191     return ERR_PTR(-ENOENT);
0192 }
0193 
0194 static struct inode *nfs_layout_find_inode(struct nfs_client *clp,
0195         const struct nfs_fh *fh,
0196         const nfs4_stateid *stateid)
0197 {
0198     struct inode *inode;
0199 
0200     inode = nfs_layout_find_inode_by_stateid(clp, stateid);
0201     if (inode == ERR_PTR(-ENOENT))
0202         inode = nfs_layout_find_inode_by_fh(clp, fh);
0203     return inode;
0204 }
0205 
0206 /*
0207  * Enforce RFC5661 section 12.5.5.2.1. (Layout Recall and Return Sequencing)
0208  */
0209 static u32 pnfs_check_callback_stateid(struct pnfs_layout_hdr *lo,
0210                     const nfs4_stateid *new)
0211 {
0212     u32 oldseq, newseq;
0213 
0214     /* Is the stateid not initialised? */
0215     if (!pnfs_layout_is_valid(lo))
0216         return NFS4ERR_NOMATCHING_LAYOUT;
0217 
0218     /* Mismatched stateid? */
0219     if (!nfs4_stateid_match_other(&lo->plh_stateid, new))
0220         return NFS4ERR_BAD_STATEID;
0221 
0222     newseq = be32_to_cpu(new->seqid);
0223     /* Are we already in a layout recall situation? */
0224     if (test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) &&
0225         lo->plh_return_seq != 0) {
0226         if (newseq < lo->plh_return_seq)
0227             return NFS4ERR_OLD_STATEID;
0228         if (newseq > lo->plh_return_seq)
0229             return NFS4ERR_DELAY;
0230         goto out;
0231     }
0232 
0233     /* Check that the stateid matches what we think it should be. */
0234     oldseq = be32_to_cpu(lo->plh_stateid.seqid);
0235     if (newseq > oldseq + 1)
0236         return NFS4ERR_DELAY;
0237     /* Crazy server! */
0238     if (newseq <= oldseq)
0239         return NFS4ERR_OLD_STATEID;
0240 out:
0241     return NFS_OK;
0242 }
0243 
0244 static u32 initiate_file_draining(struct nfs_client *clp,
0245                   struct cb_layoutrecallargs *args)
0246 {
0247     struct inode *ino;
0248     struct pnfs_layout_hdr *lo;
0249     u32 rv = NFS4ERR_NOMATCHING_LAYOUT;
0250     LIST_HEAD(free_me_list);
0251 
0252     ino = nfs_layout_find_inode(clp, &args->cbl_fh, &args->cbl_stateid);
0253     if (IS_ERR(ino)) {
0254         if (ino == ERR_PTR(-EAGAIN))
0255             rv = NFS4ERR_DELAY;
0256         goto out_noput;
0257     }
0258 
0259     pnfs_layoutcommit_inode(ino, false);
0260 
0261 
0262     spin_lock(&ino->i_lock);
0263     lo = NFS_I(ino)->layout;
0264     if (!lo) {
0265         spin_unlock(&ino->i_lock);
0266         goto out;
0267     }
0268     pnfs_get_layout_hdr(lo);
0269     rv = pnfs_check_callback_stateid(lo, &args->cbl_stateid);
0270     if (rv != NFS_OK)
0271         goto unlock;
0272 
0273     /*
0274      * Enforce RFC5661 Section 12.5.5.2.1.5 (Bulk Recall and Return)
0275      */
0276     if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
0277         rv = NFS4ERR_DELAY;
0278         goto unlock;
0279     }
0280 
0281     pnfs_set_layout_stateid(lo, &args->cbl_stateid, NULL, true);
0282     switch (pnfs_mark_matching_lsegs_return(lo, &free_me_list,
0283                 &args->cbl_range,
0284                 be32_to_cpu(args->cbl_stateid.seqid))) {
0285     case 0:
0286     case -EBUSY:
0287         /* There are layout segments that need to be returned */
0288         rv = NFS4_OK;
0289         break;
0290     case -ENOENT:
0291         set_bit(NFS_LAYOUT_DRAIN, &lo->plh_flags);
0292         /* Embrace your forgetfulness! */
0293         rv = NFS4ERR_NOMATCHING_LAYOUT;
0294 
0295         if (NFS_SERVER(ino)->pnfs_curr_ld->return_range) {
0296             NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo,
0297                 &args->cbl_range);
0298         }
0299     }
0300 unlock:
0301     spin_unlock(&ino->i_lock);
0302     pnfs_free_lseg_list(&free_me_list);
0303     /* Free all lsegs that are attached to commit buckets */
0304     nfs_commit_inode(ino, 0);
0305     pnfs_put_layout_hdr(lo);
0306 out:
0307     nfs_iput_and_deactive(ino);
0308 out_noput:
0309     trace_nfs4_cb_layoutrecall_file(clp, &args->cbl_fh, ino,
0310             &args->cbl_stateid, -rv);
0311     return rv;
0312 }
0313 
0314 static u32 initiate_bulk_draining(struct nfs_client *clp,
0315                   struct cb_layoutrecallargs *args)
0316 {
0317     int stat;
0318 
0319     if (args->cbl_recall_type == RETURN_FSID)
0320         stat = pnfs_destroy_layouts_byfsid(clp, &args->cbl_fsid, true);
0321     else
0322         stat = pnfs_destroy_layouts_byclid(clp, true);
0323     if (stat != 0)
0324         return NFS4ERR_DELAY;
0325     return NFS4ERR_NOMATCHING_LAYOUT;
0326 }
0327 
0328 static u32 do_callback_layoutrecall(struct nfs_client *clp,
0329                     struct cb_layoutrecallargs *args)
0330 {
0331     if (args->cbl_recall_type == RETURN_FILE)
0332         return initiate_file_draining(clp, args);
0333     return initiate_bulk_draining(clp, args);
0334 }
0335 
0336 __be32 nfs4_callback_layoutrecall(void *argp, void *resp,
0337                   struct cb_process_state *cps)
0338 {
0339     struct cb_layoutrecallargs *args = argp;
0340     u32 res = NFS4ERR_OP_NOT_IN_SESSION;
0341 
0342     if (cps->clp)
0343         res = do_callback_layoutrecall(cps->clp, args);
0344     return cpu_to_be32(res);
0345 }
0346 
0347 static void pnfs_recall_all_layouts(struct nfs_client *clp)
0348 {
0349     struct cb_layoutrecallargs args;
0350 
0351     /* Pretend we got a CB_LAYOUTRECALL(ALL) */
0352     memset(&args, 0, sizeof(args));
0353     args.cbl_recall_type = RETURN_ALL;
0354     /* FIXME we ignore errors, what should we do? */
0355     do_callback_layoutrecall(clp, &args);
0356 }
0357 
0358 __be32 nfs4_callback_devicenotify(void *argp, void *resp,
0359                   struct cb_process_state *cps)
0360 {
0361     struct cb_devicenotifyargs *args = argp;
0362     const struct pnfs_layoutdriver_type *ld = NULL;
0363     uint32_t i;
0364     __be32 res = 0;
0365 
0366     if (!cps->clp) {
0367         res = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION);
0368         goto out;
0369     }
0370 
0371     for (i = 0; i < args->ndevs; i++) {
0372         struct cb_devicenotifyitem *dev = &args->devs[i];
0373 
0374         if (!ld || ld->id != dev->cbd_layout_type) {
0375             pnfs_put_layoutdriver(ld);
0376             ld = pnfs_find_layoutdriver(dev->cbd_layout_type);
0377             if (!ld)
0378                 continue;
0379         }
0380         nfs4_delete_deviceid(ld, cps->clp, &dev->cbd_dev_id);
0381     }
0382     pnfs_put_layoutdriver(ld);
0383 out:
0384     kfree(args->devs);
0385     return res;
0386 }
0387 
0388 /*
0389  * Validate the sequenceID sent by the server.
0390  * Return success if the sequenceID is one more than what we last saw on
0391  * this slot, accounting for wraparound.  Increments the slot's sequence.
0392  *
0393  * We don't yet implement a duplicate request cache, instead we set the
0394  * back channel ca_maxresponsesize_cached to zero. This is OK for now
0395  * since we only currently implement idempotent callbacks anyway.
0396  *
0397  * We have a single slot backchannel at this time, so we don't bother
0398  * checking the used_slots bit array on the table.  The lower layer guarantees
0399  * a single outstanding callback request at a time.
0400  */
0401 static __be32
0402 validate_seqid(const struct nfs4_slot_table *tbl, const struct nfs4_slot *slot,
0403         const struct cb_sequenceargs * args)
0404 {
0405     __be32 ret;
0406 
0407     ret = cpu_to_be32(NFS4ERR_BADSLOT);
0408     if (args->csa_slotid > tbl->server_highest_slotid)
0409         goto out_err;
0410 
0411     /* Replay */
0412     if (args->csa_sequenceid == slot->seq_nr) {
0413         ret = cpu_to_be32(NFS4ERR_DELAY);
0414         if (nfs4_test_locked_slot(tbl, slot->slot_nr))
0415             goto out_err;
0416 
0417         /* Signal process_op to set this error on next op */
0418         ret = cpu_to_be32(NFS4ERR_RETRY_UNCACHED_REP);
0419         if (args->csa_cachethis == 0)
0420             goto out_err;
0421 
0422         /* Liar! We never allowed you to set csa_cachethis != 0 */
0423         ret = cpu_to_be32(NFS4ERR_SEQ_FALSE_RETRY);
0424         goto out_err;
0425     }
0426 
0427     /* Note: wraparound relies on seq_nr being of type u32 */
0428     /* Misordered request */
0429     ret = cpu_to_be32(NFS4ERR_SEQ_MISORDERED);
0430     if (args->csa_sequenceid != slot->seq_nr + 1)
0431         goto out_err;
0432 
0433     return cpu_to_be32(NFS4_OK);
0434 
0435 out_err:
0436     trace_nfs4_cb_seqid_err(args, ret);
0437     return ret;
0438 }
0439 
0440 /*
0441  * For each referring call triple, check the session's slot table for
0442  * a match.  If the slot is in use and the sequence numbers match, the
0443  * client is still waiting for a response to the original request.
0444  */
0445 static int referring_call_exists(struct nfs_client *clp,
0446                   uint32_t nrclists,
0447                   struct referring_call_list *rclists,
0448                   spinlock_t *lock)
0449     __releases(lock)
0450     __acquires(lock)
0451 {
0452     int status = 0;
0453     int i, j;
0454     struct nfs4_session *session;
0455     struct nfs4_slot_table *tbl;
0456     struct referring_call_list *rclist;
0457     struct referring_call *ref;
0458 
0459     /*
0460      * XXX When client trunking is implemented, this becomes
0461      * a session lookup from within the loop
0462      */
0463     session = clp->cl_session;
0464     tbl = &session->fc_slot_table;
0465 
0466     for (i = 0; i < nrclists; i++) {
0467         rclist = &rclists[i];
0468         if (memcmp(session->sess_id.data,
0469                rclist->rcl_sessionid.data,
0470                NFS4_MAX_SESSIONID_LEN) != 0)
0471             continue;
0472 
0473         for (j = 0; j < rclist->rcl_nrefcalls; j++) {
0474             ref = &rclist->rcl_refcalls[j];
0475             spin_unlock(lock);
0476             status = nfs4_slot_wait_on_seqid(tbl, ref->rc_slotid,
0477                     ref->rc_sequenceid, HZ >> 1) < 0;
0478             spin_lock(lock);
0479             if (status)
0480                 goto out;
0481         }
0482     }
0483 
0484 out:
0485     return status;
0486 }
0487 
0488 __be32 nfs4_callback_sequence(void *argp, void *resp,
0489                   struct cb_process_state *cps)
0490 {
0491     struct cb_sequenceargs *args = argp;
0492     struct cb_sequenceres *res = resp;
0493     struct nfs4_slot_table *tbl;
0494     struct nfs4_slot *slot;
0495     struct nfs_client *clp;
0496     int i;
0497     __be32 status = htonl(NFS4ERR_BADSESSION);
0498 
0499     clp = nfs4_find_client_sessionid(cps->net, args->csa_addr,
0500                      &args->csa_sessionid, cps->minorversion);
0501     if (clp == NULL)
0502         goto out;
0503 
0504     if (!(clp->cl_session->flags & SESSION4_BACK_CHAN))
0505         goto out;
0506 
0507     tbl = &clp->cl_session->bc_slot_table;
0508 
0509     /* Set up res before grabbing the spinlock */
0510     memcpy(&res->csr_sessionid, &args->csa_sessionid,
0511            sizeof(res->csr_sessionid));
0512     res->csr_sequenceid = args->csa_sequenceid;
0513     res->csr_slotid = args->csa_slotid;
0514 
0515     spin_lock(&tbl->slot_tbl_lock);
0516     /* state manager is resetting the session */
0517     if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state)) {
0518         status = htonl(NFS4ERR_DELAY);
0519         /* Return NFS4ERR_BADSESSION if we're draining the session
0520          * in order to reset it.
0521          */
0522         if (test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state))
0523             status = htonl(NFS4ERR_BADSESSION);
0524         goto out_unlock;
0525     }
0526 
0527     status = htonl(NFS4ERR_BADSLOT);
0528     slot = nfs4_lookup_slot(tbl, args->csa_slotid);
0529     if (IS_ERR(slot))
0530         goto out_unlock;
0531 
0532     res->csr_highestslotid = tbl->server_highest_slotid;
0533     res->csr_target_highestslotid = tbl->target_highest_slotid;
0534 
0535     status = validate_seqid(tbl, slot, args);
0536     if (status)
0537         goto out_unlock;
0538     if (!nfs4_try_to_lock_slot(tbl, slot)) {
0539         status = htonl(NFS4ERR_DELAY);
0540         goto out_unlock;
0541     }
0542     cps->slot = slot;
0543 
0544     /* The ca_maxresponsesize_cached is 0 with no DRC */
0545     if (args->csa_cachethis != 0) {
0546         status = htonl(NFS4ERR_REP_TOO_BIG_TO_CACHE);
0547         goto out_unlock;
0548     }
0549 
0550     /*
0551      * Check for pending referring calls.  If a match is found, a
0552      * related callback was received before the response to the original
0553      * call.
0554      */
0555     if (referring_call_exists(clp, args->csa_nrclists, args->csa_rclists,
0556                 &tbl->slot_tbl_lock) < 0) {
0557         status = htonl(NFS4ERR_DELAY);
0558         goto out_unlock;
0559     }
0560 
0561     /*
0562      * RFC5661 20.9.3
0563      * If CB_SEQUENCE returns an error, then the state of the slot
0564      * (sequence ID, cached reply) MUST NOT change.
0565      */
0566     slot->seq_nr = args->csa_sequenceid;
0567 out_unlock:
0568     spin_unlock(&tbl->slot_tbl_lock);
0569 
0570 out:
0571     cps->clp = clp; /* put in nfs4_callback_compound */
0572     for (i = 0; i < args->csa_nrclists; i++)
0573         kfree(args->csa_rclists[i].rcl_refcalls);
0574     kfree(args->csa_rclists);
0575 
0576     if (status == htonl(NFS4ERR_RETRY_UNCACHED_REP)) {
0577         cps->drc_status = status;
0578         status = 0;
0579     } else
0580         res->csr_status = status;
0581 
0582     trace_nfs4_cb_sequence(args, res, status);
0583     return status;
0584 }
0585 
0586 static bool
0587 validate_bitmap_values(unsigned int mask)
0588 {
0589     return (mask & ~RCA4_TYPE_MASK_ALL) == 0;
0590 }
0591 
0592 __be32 nfs4_callback_recallany(void *argp, void *resp,
0593                    struct cb_process_state *cps)
0594 {
0595     struct cb_recallanyargs *args = argp;
0596     __be32 status;
0597     fmode_t flags = 0;
0598     bool schedule_manager = false;
0599 
0600     status = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION);
0601     if (!cps->clp) /* set in cb_sequence */
0602         goto out;
0603 
0604     dprintk_rcu("NFS: RECALL_ANY callback request from %s\n",
0605         rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
0606 
0607     status = cpu_to_be32(NFS4ERR_INVAL);
0608     if (!validate_bitmap_values(args->craa_type_mask))
0609         goto out;
0610 
0611     status = cpu_to_be32(NFS4_OK);
0612     if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_RDATA_DLG))
0613         flags = FMODE_READ;
0614     if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_WDATA_DLG))
0615         flags |= FMODE_WRITE;
0616     if (flags)
0617         nfs_expire_unused_delegation_types(cps->clp, flags);
0618 
0619     if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_FILE_LAYOUT))
0620         pnfs_recall_all_layouts(cps->clp);
0621 
0622     if (args->craa_type_mask & BIT(PNFS_FF_RCA4_TYPE_MASK_READ)) {
0623         set_bit(NFS4CLNT_RECALL_ANY_LAYOUT_READ, &cps->clp->cl_state);
0624         schedule_manager = true;
0625     }
0626     if (args->craa_type_mask & BIT(PNFS_FF_RCA4_TYPE_MASK_RW)) {
0627         set_bit(NFS4CLNT_RECALL_ANY_LAYOUT_RW, &cps->clp->cl_state);
0628         schedule_manager = true;
0629     }
0630     if (schedule_manager)
0631         nfs4_schedule_state_manager(cps->clp);
0632 
0633 out:
0634     dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
0635     return status;
0636 }
0637 
0638 /* Reduce the fore channel's max_slots to the target value */
0639 __be32 nfs4_callback_recallslot(void *argp, void *resp,
0640                 struct cb_process_state *cps)
0641 {
0642     struct cb_recallslotargs *args = argp;
0643     struct nfs4_slot_table *fc_tbl;
0644     __be32 status;
0645 
0646     status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
0647     if (!cps->clp) /* set in cb_sequence */
0648         goto out;
0649 
0650     dprintk_rcu("NFS: CB_RECALL_SLOT request from %s target highest slotid %u\n",
0651         rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR),
0652         args->crsa_target_highest_slotid);
0653 
0654     fc_tbl = &cps->clp->cl_session->fc_slot_table;
0655 
0656     status = htonl(NFS4_OK);
0657 
0658     nfs41_set_target_slotid(fc_tbl, args->crsa_target_highest_slotid);
0659     nfs41_notify_server(cps->clp);
0660 out:
0661     dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
0662     return status;
0663 }
0664 
0665 __be32 nfs4_callback_notify_lock(void *argp, void *resp,
0666                  struct cb_process_state *cps)
0667 {
0668     struct cb_notify_lock_args *args = argp;
0669 
0670     if (!cps->clp) /* set in cb_sequence */
0671         return htonl(NFS4ERR_OP_NOT_IN_SESSION);
0672 
0673     dprintk_rcu("NFS: CB_NOTIFY_LOCK request from %s\n",
0674         rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
0675 
0676     /* Don't wake anybody if the string looked bogus */
0677     if (args->cbnl_valid)
0678         __wake_up(&cps->clp->cl_lock_waitq, TASK_NORMAL, 0, args);
0679 
0680     return htonl(NFS4_OK);
0681 }
0682 #endif /* CONFIG_NFS_V4_1 */
0683 #ifdef CONFIG_NFS_V4_2
0684 static void nfs4_copy_cb_args(struct nfs4_copy_state *cp_state,
0685                 struct cb_offloadargs *args)
0686 {
0687     cp_state->count = args->wr_count;
0688     cp_state->error = args->error;
0689     if (!args->error) {
0690         cp_state->verf.committed = args->wr_writeverf.committed;
0691         memcpy(&cp_state->verf.verifier.data[0],
0692             &args->wr_writeverf.verifier.data[0],
0693             NFS4_VERIFIER_SIZE);
0694     }
0695 }
0696 
0697 __be32 nfs4_callback_offload(void *data, void *dummy,
0698                  struct cb_process_state *cps)
0699 {
0700     struct cb_offloadargs *args = data;
0701     struct nfs_server *server;
0702     struct nfs4_copy_state *copy, *tmp_copy;
0703     bool found = false;
0704 
0705     copy = kzalloc(sizeof(struct nfs4_copy_state), GFP_KERNEL);
0706     if (!copy)
0707         return htonl(NFS4ERR_SERVERFAULT);
0708 
0709     spin_lock(&cps->clp->cl_lock);
0710     rcu_read_lock();
0711     list_for_each_entry_rcu(server, &cps->clp->cl_superblocks,
0712                 client_link) {
0713         list_for_each_entry(tmp_copy, &server->ss_copies, copies) {
0714             if (memcmp(args->coa_stateid.other,
0715                     tmp_copy->stateid.other,
0716                     sizeof(args->coa_stateid.other)))
0717                 continue;
0718             nfs4_copy_cb_args(tmp_copy, args);
0719             complete(&tmp_copy->completion);
0720             found = true;
0721             goto out;
0722         }
0723     }
0724 out:
0725     rcu_read_unlock();
0726     if (!found) {
0727         memcpy(&copy->stateid, &args->coa_stateid, NFS4_STATEID_SIZE);
0728         nfs4_copy_cb_args(copy, args);
0729         list_add_tail(&copy->copies, &cps->clp->pending_cb_stateids);
0730     } else
0731         kfree(copy);
0732     spin_unlock(&cps->clp->cl_lock);
0733 
0734     trace_nfs4_cb_offload(&args->coa_fh, &args->coa_stateid,
0735             args->wr_count, args->error,
0736             args->wr_writeverf.committed);
0737     return 0;
0738 }
0739 #endif /* CONFIG_NFS_V4_2 */
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