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0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
0004  * Copyright (C) 2004-2011 Red Hat, Inc.  All rights reserved.
0005  */
0006 
0007 #include <linux/slab.h>
0008 #include <linux/spinlock.h>
0009 #include <linux/completion.h>
0010 #include <linux/buffer_head.h>
0011 #include <linux/namei.h>
0012 #include <linux/mm.h>
0013 #include <linux/cred.h>
0014 #include <linux/xattr.h>
0015 #include <linux/posix_acl.h>
0016 #include <linux/gfs2_ondisk.h>
0017 #include <linux/crc32.h>
0018 #include <linux/iomap.h>
0019 #include <linux/security.h>
0020 #include <linux/fiemap.h>
0021 #include <linux/uaccess.h>
0022 
0023 #include "gfs2.h"
0024 #include "incore.h"
0025 #include "acl.h"
0026 #include "bmap.h"
0027 #include "dir.h"
0028 #include "xattr.h"
0029 #include "glock.h"
0030 #include "inode.h"
0031 #include "meta_io.h"
0032 #include "quota.h"
0033 #include "rgrp.h"
0034 #include "trans.h"
0035 #include "util.h"
0036 #include "super.h"
0037 #include "glops.h"
0038 
0039 static const struct inode_operations gfs2_file_iops;
0040 static const struct inode_operations gfs2_dir_iops;
0041 static const struct inode_operations gfs2_symlink_iops;
0042 
0043 /**
0044  * gfs2_set_iop - Sets inode operations
0045  * @inode: The inode with correct i_mode filled in
0046  *
0047  * GFS2 lookup code fills in vfs inode contents based on info obtained
0048  * from directory entry inside gfs2_inode_lookup().
0049  */
0050 
0051 static void gfs2_set_iop(struct inode *inode)
0052 {
0053     struct gfs2_sbd *sdp = GFS2_SB(inode);
0054     umode_t mode = inode->i_mode;
0055 
0056     if (S_ISREG(mode)) {
0057         inode->i_op = &gfs2_file_iops;
0058         if (gfs2_localflocks(sdp))
0059             inode->i_fop = &gfs2_file_fops_nolock;
0060         else
0061             inode->i_fop = &gfs2_file_fops;
0062     } else if (S_ISDIR(mode)) {
0063         inode->i_op = &gfs2_dir_iops;
0064         if (gfs2_localflocks(sdp))
0065             inode->i_fop = &gfs2_dir_fops_nolock;
0066         else
0067             inode->i_fop = &gfs2_dir_fops;
0068     } else if (S_ISLNK(mode)) {
0069         inode->i_op = &gfs2_symlink_iops;
0070     } else {
0071         inode->i_op = &gfs2_file_iops;
0072         init_special_inode(inode, inode->i_mode, inode->i_rdev);
0073     }
0074 }
0075 
0076 static int iget_test(struct inode *inode, void *opaque)
0077 {
0078     u64 no_addr = *(u64 *)opaque;
0079 
0080     return GFS2_I(inode)->i_no_addr == no_addr;
0081 }
0082 
0083 static int iget_set(struct inode *inode, void *opaque)
0084 {
0085     u64 no_addr = *(u64 *)opaque;
0086 
0087     GFS2_I(inode)->i_no_addr = no_addr;
0088     inode->i_ino = no_addr;
0089     return 0;
0090 }
0091 
0092 /**
0093  * gfs2_inode_lookup - Lookup an inode
0094  * @sb: The super block
0095  * @type: The type of the inode
0096  * @no_addr: The inode number
0097  * @no_formal_ino: The inode generation number
0098  * @blktype: Requested block type (GFS2_BLKST_DINODE or GFS2_BLKST_UNLINKED;
0099  *           GFS2_BLKST_FREE to indicate not to verify)
0100  *
0101  * If @type is DT_UNKNOWN, the inode type is fetched from disk.
0102  *
0103  * If @blktype is anything other than GFS2_BLKST_FREE (which is used as a
0104  * placeholder because it doesn't otherwise make sense), the on-disk block type
0105  * is verified to be @blktype.
0106  *
0107  * When @no_formal_ino is non-zero, this function will return ERR_PTR(-ESTALE)
0108  * if it detects that @no_formal_ino doesn't match the actual inode generation
0109  * number.  However, it doesn't always know unless @type is DT_UNKNOWN.
0110  *
0111  * Returns: A VFS inode, or an error
0112  */
0113 
0114 struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type,
0115                 u64 no_addr, u64 no_formal_ino,
0116                 unsigned int blktype)
0117 {
0118     struct inode *inode;
0119     struct gfs2_inode *ip;
0120     struct gfs2_holder i_gh;
0121     int error;
0122 
0123     gfs2_holder_mark_uninitialized(&i_gh);
0124     inode = iget5_locked(sb, no_addr, iget_test, iget_set, &no_addr);
0125     if (!inode)
0126         return ERR_PTR(-ENOMEM);
0127 
0128     ip = GFS2_I(inode);
0129 
0130     if (inode->i_state & I_NEW) {
0131         struct gfs2_sbd *sdp = GFS2_SB(inode);
0132         struct gfs2_glock *io_gl;
0133 
0134         error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE,
0135                        &ip->i_gl);
0136         if (unlikely(error))
0137             goto fail;
0138 
0139         error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE,
0140                        &io_gl);
0141         if (unlikely(error))
0142             goto fail;
0143 
0144         if (blktype != GFS2_BLKST_UNLINKED)
0145             gfs2_cancel_delete_work(io_gl);
0146         error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT,
0147                        &ip->i_iopen_gh);
0148         gfs2_glock_put(io_gl);
0149         if (unlikely(error))
0150             goto fail;
0151 
0152         if (type == DT_UNKNOWN || blktype != GFS2_BLKST_FREE) {
0153             /*
0154              * The GL_SKIP flag indicates to skip reading the inode
0155              * block.  We read the inode when instantiating it
0156              * after possibly checking the block type.
0157              */
0158             error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE,
0159                            GL_SKIP, &i_gh);
0160             if (error)
0161                 goto fail;
0162 
0163             error = -ESTALE;
0164             if (no_formal_ino &&
0165                 gfs2_inode_already_deleted(ip->i_gl, no_formal_ino))
0166                 goto fail;
0167 
0168             if (blktype != GFS2_BLKST_FREE) {
0169                 error = gfs2_check_blk_type(sdp, no_addr,
0170                                 blktype);
0171                 if (error)
0172                     goto fail;
0173             }
0174         }
0175 
0176         set_bit(GLF_INSTANTIATE_NEEDED, &ip->i_gl->gl_flags);
0177 
0178         /* Lowest possible timestamp; will be overwritten in gfs2_dinode_in. */
0179         inode->i_atime.tv_sec = 1LL << (8 * sizeof(inode->i_atime.tv_sec) - 1);
0180         inode->i_atime.tv_nsec = 0;
0181 
0182         glock_set_object(ip->i_gl, ip);
0183 
0184         if (type == DT_UNKNOWN) {
0185             /* Inode glock must be locked already */
0186             error = gfs2_instantiate(&i_gh);
0187             if (error) {
0188                 glock_clear_object(ip->i_gl, ip);
0189                 goto fail;
0190             }
0191         } else {
0192             ip->i_no_formal_ino = no_formal_ino;
0193             inode->i_mode = DT2IF(type);
0194         }
0195 
0196         if (gfs2_holder_initialized(&i_gh))
0197             gfs2_glock_dq_uninit(&i_gh);
0198         glock_set_object(ip->i_iopen_gh.gh_gl, ip);
0199 
0200         gfs2_set_iop(inode);
0201         unlock_new_inode(inode);
0202     }
0203 
0204     if (no_formal_ino && ip->i_no_formal_ino &&
0205         no_formal_ino != ip->i_no_formal_ino) {
0206         iput(inode);
0207         return ERR_PTR(-ESTALE);
0208     }
0209 
0210     return inode;
0211 
0212 fail:
0213     if (gfs2_holder_initialized(&ip->i_iopen_gh))
0214         gfs2_glock_dq_uninit(&ip->i_iopen_gh);
0215     if (gfs2_holder_initialized(&i_gh))
0216         gfs2_glock_dq_uninit(&i_gh);
0217     iget_failed(inode);
0218     return ERR_PTR(error);
0219 }
0220 
0221 /**
0222  * gfs2_lookup_by_inum - look up an inode by inode number
0223  * @sdp: The super block
0224  * @no_addr: The inode number
0225  * @no_formal_ino: The inode generation number (0 for any)
0226  * @blktype: Requested block type (see gfs2_inode_lookup)
0227  */
0228 struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr,
0229                   u64 no_formal_ino, unsigned int blktype)
0230 {
0231     struct super_block *sb = sdp->sd_vfs;
0232     struct inode *inode;
0233     int error;
0234 
0235     inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, no_formal_ino,
0236                   blktype);
0237     if (IS_ERR(inode))
0238         return inode;
0239 
0240     if (no_formal_ino) {
0241         error = -EIO;
0242         if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM)
0243             goto fail_iput;
0244     }
0245     return inode;
0246 
0247 fail_iput:
0248     iput(inode);
0249     return ERR_PTR(error);
0250 }
0251 
0252 
0253 struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
0254 {
0255     struct qstr qstr;
0256     struct inode *inode;
0257     gfs2_str2qstr(&qstr, name);
0258     inode = gfs2_lookupi(dip, &qstr, 1);
0259     /* gfs2_lookupi has inconsistent callers: vfs
0260      * related routines expect NULL for no entry found,
0261      * gfs2_lookup_simple callers expect ENOENT
0262      * and do not check for NULL.
0263      */
0264     if (inode == NULL)
0265         return ERR_PTR(-ENOENT);
0266     else
0267         return inode;
0268 }
0269 
0270 
0271 /**
0272  * gfs2_lookupi - Look up a filename in a directory and return its inode
0273  * @dir: The inode of the directory containing the inode to look-up
0274  * @name: The name of the inode to look for
0275  * @is_root: If 1, ignore the caller's permissions
0276  *
0277  * This can be called via the VFS filldir function when NFS is doing
0278  * a readdirplus and the inode which its intending to stat isn't
0279  * already in cache. In this case we must not take the directory glock
0280  * again, since the readdir call will have already taken that lock.
0281  *
0282  * Returns: errno
0283  */
0284 
0285 struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
0286                int is_root)
0287 {
0288     struct super_block *sb = dir->i_sb;
0289     struct gfs2_inode *dip = GFS2_I(dir);
0290     struct gfs2_holder d_gh;
0291     int error = 0;
0292     struct inode *inode = NULL;
0293 
0294     gfs2_holder_mark_uninitialized(&d_gh);
0295     if (!name->len || name->len > GFS2_FNAMESIZE)
0296         return ERR_PTR(-ENAMETOOLONG);
0297 
0298     if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
0299         (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
0300          dir == d_inode(sb->s_root))) {
0301         igrab(dir);
0302         return dir;
0303     }
0304 
0305     if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) {
0306         error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
0307         if (error)
0308             return ERR_PTR(error);
0309     }
0310 
0311     if (!is_root) {
0312         error = gfs2_permission(&init_user_ns, dir, MAY_EXEC);
0313         if (error)
0314             goto out;
0315     }
0316 
0317     inode = gfs2_dir_search(dir, name, false);
0318     if (IS_ERR(inode))
0319         error = PTR_ERR(inode);
0320 out:
0321     if (gfs2_holder_initialized(&d_gh))
0322         gfs2_glock_dq_uninit(&d_gh);
0323     if (error == -ENOENT)
0324         return NULL;
0325     return inode ? inode : ERR_PTR(error);
0326 }
0327 
0328 /**
0329  * create_ok - OK to create a new on-disk inode here?
0330  * @dip:  Directory in which dinode is to be created
0331  * @name:  Name of new dinode
0332  * @mode:
0333  *
0334  * Returns: errno
0335  */
0336 
0337 static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
0338              umode_t mode)
0339 {
0340     int error;
0341 
0342     error = gfs2_permission(&init_user_ns, &dip->i_inode,
0343                 MAY_WRITE | MAY_EXEC);
0344     if (error)
0345         return error;
0346 
0347     /*  Don't create entries in an unlinked directory  */
0348     if (!dip->i_inode.i_nlink)
0349         return -ENOENT;
0350 
0351     if (dip->i_entries == (u32)-1)
0352         return -EFBIG;
0353     if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1)
0354         return -EMLINK;
0355 
0356     return 0;
0357 }
0358 
0359 static void munge_mode_uid_gid(const struct gfs2_inode *dip,
0360                    struct inode *inode)
0361 {
0362     if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
0363         (dip->i_inode.i_mode & S_ISUID) &&
0364         !uid_eq(dip->i_inode.i_uid, GLOBAL_ROOT_UID)) {
0365         if (S_ISDIR(inode->i_mode))
0366             inode->i_mode |= S_ISUID;
0367         else if (!uid_eq(dip->i_inode.i_uid, current_fsuid()))
0368             inode->i_mode &= ~07111;
0369         inode->i_uid = dip->i_inode.i_uid;
0370     } else
0371         inode->i_uid = current_fsuid();
0372 
0373     if (dip->i_inode.i_mode & S_ISGID) {
0374         if (S_ISDIR(inode->i_mode))
0375             inode->i_mode |= S_ISGID;
0376         inode->i_gid = dip->i_inode.i_gid;
0377     } else
0378         inode->i_gid = current_fsgid();
0379 }
0380 
0381 static int alloc_dinode(struct gfs2_inode *ip, u32 flags, unsigned *dblocks)
0382 {
0383     struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
0384     struct gfs2_alloc_parms ap = { .target = *dblocks, .aflags = flags, };
0385     int error;
0386 
0387     error = gfs2_quota_lock_check(ip, &ap);
0388     if (error)
0389         goto out;
0390 
0391     error = gfs2_inplace_reserve(ip, &ap);
0392     if (error)
0393         goto out_quota;
0394 
0395     error = gfs2_trans_begin(sdp, (*dblocks * RES_RG_BIT) + RES_STATFS + RES_QUOTA, 0);
0396     if (error)
0397         goto out_ipreserv;
0398 
0399     error = gfs2_alloc_blocks(ip, &ip->i_no_addr, dblocks, 1, &ip->i_generation);
0400     ip->i_no_formal_ino = ip->i_generation;
0401     ip->i_inode.i_ino = ip->i_no_addr;
0402     ip->i_goal = ip->i_no_addr;
0403 
0404     gfs2_trans_end(sdp);
0405 
0406 out_ipreserv:
0407     gfs2_inplace_release(ip);
0408 out_quota:
0409     gfs2_quota_unlock(ip);
0410 out:
0411     return error;
0412 }
0413 
0414 static void gfs2_init_dir(struct buffer_head *dibh,
0415               const struct gfs2_inode *parent)
0416 {
0417     struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
0418     struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
0419 
0420     gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent);
0421     dent->de_inum = di->di_num; /* already GFS2 endian */
0422     dent->de_type = cpu_to_be16(DT_DIR);
0423 
0424     dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
0425     gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
0426     gfs2_inum_out(parent, dent);
0427     dent->de_type = cpu_to_be16(DT_DIR);
0428     
0429 }
0430 
0431 /**
0432  * gfs2_init_xattr - Initialise an xattr block for a new inode
0433  * @ip: The inode in question
0434  *
0435  * This sets up an empty xattr block for a new inode, ready to
0436  * take any ACLs, LSM xattrs, etc.
0437  */
0438 
0439 static void gfs2_init_xattr(struct gfs2_inode *ip)
0440 {
0441     struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
0442     struct buffer_head *bh;
0443     struct gfs2_ea_header *ea;
0444 
0445     bh = gfs2_meta_new(ip->i_gl, ip->i_eattr);
0446     gfs2_trans_add_meta(ip->i_gl, bh);
0447     gfs2_metatype_set(bh, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
0448     gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header));
0449 
0450     ea = GFS2_EA_BH2FIRST(bh);
0451     ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
0452     ea->ea_type = GFS2_EATYPE_UNUSED;
0453     ea->ea_flags = GFS2_EAFLAG_LAST;
0454 
0455     brelse(bh);
0456 }
0457 
0458 /**
0459  * init_dinode - Fill in a new dinode structure
0460  * @dip: The directory this inode is being created in
0461  * @ip: The inode
0462  * @symname: The symlink destination (if a symlink)
0463  *
0464  */
0465 
0466 static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip,
0467             const char *symname)
0468 {
0469     struct gfs2_dinode *di;
0470     struct buffer_head *dibh;
0471 
0472     dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr);
0473     gfs2_trans_add_meta(ip->i_gl, dibh);
0474     di = (struct gfs2_dinode *)dibh->b_data;
0475     gfs2_dinode_out(ip, di);
0476 
0477     di->di_major = cpu_to_be32(imajor(&ip->i_inode));
0478     di->di_minor = cpu_to_be32(iminor(&ip->i_inode));
0479     di->__pad1 = 0;
0480     di->__pad2 = 0;
0481     di->__pad3 = 0;
0482     memset(&di->__pad4, 0, sizeof(di->__pad4));
0483     memset(&di->di_reserved, 0, sizeof(di->di_reserved));
0484     gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
0485 
0486     switch(ip->i_inode.i_mode & S_IFMT) {
0487     case S_IFDIR:
0488         gfs2_init_dir(dibh, dip);
0489         break;
0490     case S_IFLNK:
0491         memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size);
0492         break;
0493     }
0494 
0495     set_buffer_uptodate(dibh);
0496     brelse(dibh);
0497 }
0498 
0499 /**
0500  * gfs2_trans_da_blks - Calculate number of blocks to link inode
0501  * @dip: The directory we are linking into
0502  * @da: The dir add information
0503  * @nr_inodes: The number of inodes involved
0504  *
0505  * This calculate the number of blocks we need to reserve in a
0506  * transaction to link @nr_inodes into a directory. In most cases
0507  * @nr_inodes will be 2 (the directory plus the inode being linked in)
0508  * but in case of rename, 4 may be required.
0509  *
0510  * Returns: Number of blocks
0511  */
0512 
0513 static unsigned gfs2_trans_da_blks(const struct gfs2_inode *dip,
0514                    const struct gfs2_diradd *da,
0515                    unsigned nr_inodes)
0516 {
0517     return da->nr_blocks + gfs2_rg_blocks(dip, da->nr_blocks) +
0518            (nr_inodes * RES_DINODE) + RES_QUOTA + RES_STATFS;
0519 }
0520 
0521 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
0522                struct gfs2_inode *ip, struct gfs2_diradd *da)
0523 {
0524     struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
0525     struct gfs2_alloc_parms ap = { .target = da->nr_blocks, };
0526     int error;
0527 
0528     if (da->nr_blocks) {
0529         error = gfs2_quota_lock_check(dip, &ap);
0530         if (error)
0531             goto fail_quota_locks;
0532 
0533         error = gfs2_inplace_reserve(dip, &ap);
0534         if (error)
0535             goto fail_quota_locks;
0536 
0537         error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, da, 2), 0);
0538         if (error)
0539             goto fail_ipreserv;
0540     } else {
0541         error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
0542         if (error)
0543             goto fail_quota_locks;
0544     }
0545 
0546     error = gfs2_dir_add(&dip->i_inode, name, ip, da);
0547 
0548     gfs2_trans_end(sdp);
0549 fail_ipreserv:
0550     gfs2_inplace_release(dip);
0551 fail_quota_locks:
0552     gfs2_quota_unlock(dip);
0553     return error;
0554 }
0555 
0556 static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
0557             void *fs_info)
0558 {
0559     const struct xattr *xattr;
0560     int err = 0;
0561 
0562     for (xattr = xattr_array; xattr->name != NULL; xattr++) {
0563         err = __gfs2_xattr_set(inode, xattr->name, xattr->value,
0564                        xattr->value_len, 0,
0565                        GFS2_EATYPE_SECURITY);
0566         if (err < 0)
0567             break;
0568     }
0569     return err;
0570 }
0571 
0572 /**
0573  * gfs2_create_inode - Create a new inode
0574  * @dir: The parent directory
0575  * @dentry: The new dentry
0576  * @file: If non-NULL, the file which is being opened
0577  * @mode: The permissions on the new inode
0578  * @dev: For device nodes, this is the device number
0579  * @symname: For symlinks, this is the link destination
0580  * @size: The initial size of the inode (ignored for directories)
0581  * @excl: Force fail if inode exists
0582  *
0583  * Returns: 0 on success, or error code
0584  */
0585 
0586 static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
0587                  struct file *file,
0588                  umode_t mode, dev_t dev, const char *symname,
0589                  unsigned int size, int excl)
0590 {
0591     const struct qstr *name = &dentry->d_name;
0592     struct posix_acl *default_acl, *acl;
0593     struct gfs2_holder ghs[2];
0594     struct inode *inode = NULL;
0595     struct gfs2_inode *dip = GFS2_I(dir), *ip;
0596     struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
0597     struct gfs2_glock *io_gl;
0598     int error, free_vfs_inode = 1;
0599     u32 aflags = 0;
0600     unsigned blocks = 1;
0601     struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
0602 
0603     if (!name->len || name->len > GFS2_FNAMESIZE)
0604         return -ENAMETOOLONG;
0605 
0606     error = gfs2_qa_get(dip);
0607     if (error)
0608         return error;
0609 
0610     error = gfs2_rindex_update(sdp);
0611     if (error)
0612         goto fail;
0613 
0614     error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
0615     if (error)
0616         goto fail;
0617     gfs2_holder_mark_uninitialized(ghs + 1);
0618 
0619     error = create_ok(dip, name, mode);
0620     if (error)
0621         goto fail_gunlock;
0622 
0623     inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl);
0624     error = PTR_ERR(inode);
0625     if (!IS_ERR(inode)) {
0626         if (S_ISDIR(inode->i_mode)) {
0627             iput(inode);
0628             inode = ERR_PTR(-EISDIR);
0629             goto fail_gunlock;
0630         }
0631         d_instantiate(dentry, inode);
0632         error = 0;
0633         if (file) {
0634             if (S_ISREG(inode->i_mode))
0635                 error = finish_open(file, dentry, gfs2_open_common);
0636             else
0637                 error = finish_no_open(file, NULL);
0638         }
0639         gfs2_glock_dq_uninit(ghs);
0640         goto fail;
0641     } else if (error != -ENOENT) {
0642         goto fail_gunlock;
0643     }
0644 
0645     error = gfs2_diradd_alloc_required(dir, name, &da);
0646     if (error < 0)
0647         goto fail_gunlock;
0648 
0649     inode = new_inode(sdp->sd_vfs);
0650     error = -ENOMEM;
0651     if (!inode)
0652         goto fail_gunlock;
0653 
0654     error = posix_acl_create(dir, &mode, &default_acl, &acl);
0655     if (error)
0656         goto fail_gunlock;
0657 
0658     ip = GFS2_I(inode);
0659     error = gfs2_qa_get(ip);
0660     if (error)
0661         goto fail_free_acls;
0662 
0663     inode->i_mode = mode;
0664     set_nlink(inode, S_ISDIR(mode) ? 2 : 1);
0665     inode->i_rdev = dev;
0666     inode->i_size = size;
0667     inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
0668     munge_mode_uid_gid(dip, inode);
0669     check_and_update_goal(dip);
0670     ip->i_goal = dip->i_goal;
0671     ip->i_diskflags = 0;
0672     ip->i_eattr = 0;
0673     ip->i_height = 0;
0674     ip->i_depth = 0;
0675     ip->i_entries = 0;
0676     ip->i_no_addr = 0; /* Temporarily zero until real addr is assigned */
0677 
0678     switch(mode & S_IFMT) {
0679     case S_IFREG:
0680         if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) ||
0681             gfs2_tune_get(sdp, gt_new_files_jdata))
0682             ip->i_diskflags |= GFS2_DIF_JDATA;
0683         gfs2_set_aops(inode);
0684         break;
0685     case S_IFDIR:
0686         ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA);
0687         ip->i_diskflags |= GFS2_DIF_JDATA;
0688         ip->i_entries = 2;
0689         break;
0690     }
0691 
0692     /* Force SYSTEM flag on all files and subdirs of a SYSTEM directory */
0693     if (dip->i_diskflags & GFS2_DIF_SYSTEM)
0694         ip->i_diskflags |= GFS2_DIF_SYSTEM;
0695 
0696     gfs2_set_inode_flags(inode);
0697 
0698     if ((GFS2_I(d_inode(sdp->sd_root_dir)) == dip) ||
0699         (dip->i_diskflags & GFS2_DIF_TOPDIR))
0700         aflags |= GFS2_AF_ORLOV;
0701 
0702     if (default_acl || acl)
0703         blocks++;
0704 
0705     error = alloc_dinode(ip, aflags, &blocks);
0706     if (error)
0707         goto fail_free_inode;
0708 
0709     gfs2_set_inode_blocks(inode, blocks);
0710 
0711     error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
0712     if (error)
0713         goto fail_free_inode;
0714 
0715     error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
0716     if (error)
0717         goto fail_free_inode;
0718     gfs2_cancel_delete_work(io_gl);
0719 
0720     error = insert_inode_locked4(inode, ip->i_no_addr, iget_test, &ip->i_no_addr);
0721     BUG_ON(error);
0722 
0723     error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
0724     if (error)
0725         goto fail_gunlock2;
0726 
0727     error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
0728     if (error)
0729         goto fail_gunlock3;
0730 
0731     error = gfs2_trans_begin(sdp, blocks, 0);
0732     if (error)
0733         goto fail_gunlock3;
0734 
0735     if (blocks > 1) {
0736         ip->i_eattr = ip->i_no_addr + 1;
0737         gfs2_init_xattr(ip);
0738     }
0739     init_dinode(dip, ip, symname);
0740     gfs2_trans_end(sdp);
0741 
0742     glock_set_object(ip->i_gl, ip);
0743     glock_set_object(io_gl, ip);
0744     gfs2_set_iop(inode);
0745 
0746     free_vfs_inode = 0; /* After this point, the inode is no longer
0747                    considered free. Any failures need to undo
0748                    the gfs2 structures. */
0749     if (default_acl) {
0750         error = __gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
0751         if (error)
0752             goto fail_gunlock4;
0753         posix_acl_release(default_acl);
0754         default_acl = NULL;
0755     }
0756     if (acl) {
0757         error = __gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS);
0758         if (error)
0759             goto fail_gunlock4;
0760         posix_acl_release(acl);
0761         acl = NULL;
0762     }
0763 
0764     error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name,
0765                          &gfs2_initxattrs, NULL);
0766     if (error)
0767         goto fail_gunlock4;
0768 
0769     error = link_dinode(dip, name, ip, &da);
0770     if (error)
0771         goto fail_gunlock4;
0772 
0773     mark_inode_dirty(inode);
0774     d_instantiate(dentry, inode);
0775     /* After instantiate, errors should result in evict which will destroy
0776      * both inode and iopen glocks properly. */
0777     if (file) {
0778         file->f_mode |= FMODE_CREATED;
0779         error = finish_open(file, dentry, gfs2_open_common);
0780     }
0781     gfs2_glock_dq_uninit(ghs);
0782     gfs2_qa_put(ip);
0783     gfs2_glock_dq_uninit(ghs + 1);
0784     gfs2_glock_put(io_gl);
0785     gfs2_qa_put(dip);
0786     unlock_new_inode(inode);
0787     return error;
0788 
0789 fail_gunlock4:
0790     glock_clear_object(ip->i_gl, ip);
0791     glock_clear_object(io_gl, ip);
0792 fail_gunlock3:
0793     gfs2_glock_dq_uninit(&ip->i_iopen_gh);
0794 fail_gunlock2:
0795     gfs2_glock_put(io_gl);
0796 fail_free_inode:
0797     if (ip->i_gl) {
0798         if (free_vfs_inode) /* else evict will do the put for us */
0799             gfs2_glock_put(ip->i_gl);
0800     }
0801     gfs2_rs_deltree(&ip->i_res);
0802     gfs2_qa_put(ip);
0803 fail_free_acls:
0804     posix_acl_release(default_acl);
0805     posix_acl_release(acl);
0806 fail_gunlock:
0807     gfs2_dir_no_add(&da);
0808     gfs2_glock_dq_uninit(ghs);
0809     if (!IS_ERR_OR_NULL(inode)) {
0810         clear_nlink(inode);
0811         if (!free_vfs_inode)
0812             mark_inode_dirty(inode);
0813         set_bit(free_vfs_inode ? GIF_FREE_VFS_INODE : GIF_ALLOC_FAILED,
0814             &GFS2_I(inode)->i_flags);
0815         if (inode->i_state & I_NEW)
0816             iget_failed(inode);
0817         else
0818             iput(inode);
0819     }
0820     if (gfs2_holder_initialized(ghs + 1))
0821         gfs2_glock_dq_uninit(ghs + 1);
0822 fail:
0823     gfs2_qa_put(dip);
0824     return error;
0825 }
0826 
0827 /**
0828  * gfs2_create - Create a file
0829  * @mnt_userns: User namespace of the mount the inode was found from
0830  * @dir: The directory in which to create the file
0831  * @dentry: The dentry of the new file
0832  * @mode: The mode of the new file
0833  * @excl: Force fail if inode exists
0834  *
0835  * Returns: errno
0836  */
0837 
0838 static int gfs2_create(struct user_namespace *mnt_userns, struct inode *dir,
0839                struct dentry *dentry, umode_t mode, bool excl)
0840 {
0841     return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl);
0842 }
0843 
0844 /**
0845  * __gfs2_lookup - Look up a filename in a directory and return its inode
0846  * @dir: The directory inode
0847  * @dentry: The dentry of the new inode
0848  * @file: File to be opened
0849  *
0850  *
0851  * Returns: errno
0852  */
0853 
0854 static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry,
0855                     struct file *file)
0856 {
0857     struct inode *inode;
0858     struct dentry *d;
0859     struct gfs2_holder gh;
0860     struct gfs2_glock *gl;
0861     int error;
0862 
0863     inode = gfs2_lookupi(dir, &dentry->d_name, 0);
0864     if (inode == NULL) {
0865         d_add(dentry, NULL);
0866         return NULL;
0867     }
0868     if (IS_ERR(inode))
0869         return ERR_CAST(inode);
0870 
0871     gl = GFS2_I(inode)->i_gl;
0872     error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
0873     if (error) {
0874         iput(inode);
0875         return ERR_PTR(error);
0876     }
0877 
0878     d = d_splice_alias(inode, dentry);
0879     if (IS_ERR(d)) {
0880         gfs2_glock_dq_uninit(&gh);
0881         return d;
0882     }
0883     if (file && S_ISREG(inode->i_mode))
0884         error = finish_open(file, dentry, gfs2_open_common);
0885 
0886     gfs2_glock_dq_uninit(&gh);
0887     if (error) {
0888         dput(d);
0889         return ERR_PTR(error);
0890     }
0891     return d;
0892 }
0893 
0894 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
0895                   unsigned flags)
0896 {
0897     return __gfs2_lookup(dir, dentry, NULL);
0898 }
0899 
0900 /**
0901  * gfs2_link - Link to a file
0902  * @old_dentry: The inode to link
0903  * @dir: Add link to this directory
0904  * @dentry: The name of the link
0905  *
0906  * Link the inode in "old_dentry" into the directory "dir" with the
0907  * name in "dentry".
0908  *
0909  * Returns: errno
0910  */
0911 
0912 static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
0913              struct dentry *dentry)
0914 {
0915     struct gfs2_inode *dip = GFS2_I(dir);
0916     struct gfs2_sbd *sdp = GFS2_SB(dir);
0917     struct inode *inode = d_inode(old_dentry);
0918     struct gfs2_inode *ip = GFS2_I(inode);
0919     struct gfs2_holder ghs[2];
0920     struct buffer_head *dibh;
0921     struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
0922     int error;
0923 
0924     if (S_ISDIR(inode->i_mode))
0925         return -EPERM;
0926 
0927     error = gfs2_qa_get(dip);
0928     if (error)
0929         return error;
0930 
0931     gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
0932     gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
0933 
0934     error = gfs2_glock_nq(ghs); /* parent */
0935     if (error)
0936         goto out_parent;
0937 
0938     error = gfs2_glock_nq(ghs + 1); /* child */
0939     if (error)
0940         goto out_child;
0941 
0942     error = -ENOENT;
0943     if (inode->i_nlink == 0)
0944         goto out_gunlock;
0945 
0946     error = gfs2_permission(&init_user_ns, dir, MAY_WRITE | MAY_EXEC);
0947     if (error)
0948         goto out_gunlock;
0949 
0950     error = gfs2_dir_check(dir, &dentry->d_name, NULL);
0951     switch (error) {
0952     case -ENOENT:
0953         break;
0954     case 0:
0955         error = -EEXIST;
0956         goto out_gunlock;
0957     default:
0958         goto out_gunlock;
0959     }
0960 
0961     error = -EINVAL;
0962     if (!dip->i_inode.i_nlink)
0963         goto out_gunlock;
0964     error = -EFBIG;
0965     if (dip->i_entries == (u32)-1)
0966         goto out_gunlock;
0967     error = -EPERM;
0968     if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
0969         goto out_gunlock;
0970     error = -EINVAL;
0971     if (!ip->i_inode.i_nlink)
0972         goto out_gunlock;
0973     error = -EMLINK;
0974     if (ip->i_inode.i_nlink == (u32)-1)
0975         goto out_gunlock;
0976 
0977     error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da);
0978     if (error < 0)
0979         goto out_gunlock;
0980 
0981     if (da.nr_blocks) {
0982         struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
0983         error = gfs2_quota_lock_check(dip, &ap);
0984         if (error)
0985             goto out_gunlock;
0986 
0987         error = gfs2_inplace_reserve(dip, &ap);
0988         if (error)
0989             goto out_gunlock_q;
0990 
0991         error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0);
0992         if (error)
0993             goto out_ipres;
0994     } else {
0995         error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
0996         if (error)
0997             goto out_ipres;
0998     }
0999 
1000     error = gfs2_meta_inode_buffer(ip, &dibh);
1001     if (error)
1002         goto out_end_trans;
1003 
1004     error = gfs2_dir_add(dir, &dentry->d_name, ip, &da);
1005     if (error)
1006         goto out_brelse;
1007 
1008     gfs2_trans_add_meta(ip->i_gl, dibh);
1009     inc_nlink(&ip->i_inode);
1010     ip->i_inode.i_ctime = current_time(&ip->i_inode);
1011     ihold(inode);
1012     d_instantiate(dentry, inode);
1013     mark_inode_dirty(inode);
1014 
1015 out_brelse:
1016     brelse(dibh);
1017 out_end_trans:
1018     gfs2_trans_end(sdp);
1019 out_ipres:
1020     if (da.nr_blocks)
1021         gfs2_inplace_release(dip);
1022 out_gunlock_q:
1023     if (da.nr_blocks)
1024         gfs2_quota_unlock(dip);
1025 out_gunlock:
1026     gfs2_dir_no_add(&da);
1027     gfs2_glock_dq(ghs + 1);
1028 out_child:
1029     gfs2_glock_dq(ghs);
1030 out_parent:
1031     gfs2_qa_put(dip);
1032     gfs2_holder_uninit(ghs);
1033     gfs2_holder_uninit(ghs + 1);
1034     return error;
1035 }
1036 
1037 /*
1038  * gfs2_unlink_ok - check to see that a inode is still in a directory
1039  * @dip: the directory
1040  * @name: the name of the file
1041  * @ip: the inode
1042  *
1043  * Assumes that the lock on (at least) @dip is held.
1044  *
1045  * Returns: 0 if the parent/child relationship is correct, errno if it isn't
1046  */
1047 
1048 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
1049               const struct gfs2_inode *ip)
1050 {
1051     int error;
1052 
1053     if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
1054         return -EPERM;
1055 
1056     if ((dip->i_inode.i_mode & S_ISVTX) &&
1057         !uid_eq(dip->i_inode.i_uid, current_fsuid()) &&
1058         !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER))
1059         return -EPERM;
1060 
1061     if (IS_APPEND(&dip->i_inode))
1062         return -EPERM;
1063 
1064     error = gfs2_permission(&init_user_ns, &dip->i_inode,
1065                 MAY_WRITE | MAY_EXEC);
1066     if (error)
1067         return error;
1068 
1069     return gfs2_dir_check(&dip->i_inode, name, ip);
1070 }
1071 
1072 /**
1073  * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it
1074  * @dip: The parent directory
1075  * @dentry: The dentry to unlink
1076  *
1077  * Called with all the locks and in a transaction. This will only be
1078  * called for a directory after it has been checked to ensure it is empty.
1079  *
1080  * Returns: 0 on success, or an error
1081  */
1082 
1083 static int gfs2_unlink_inode(struct gfs2_inode *dip,
1084                  const struct dentry *dentry)
1085 {
1086     struct inode *inode = d_inode(dentry);
1087     struct gfs2_inode *ip = GFS2_I(inode);
1088     int error;
1089 
1090     error = gfs2_dir_del(dip, dentry);
1091     if (error)
1092         return error;
1093 
1094     ip->i_entries = 0;
1095     inode->i_ctime = current_time(inode);
1096     if (S_ISDIR(inode->i_mode))
1097         clear_nlink(inode);
1098     else
1099         drop_nlink(inode);
1100     mark_inode_dirty(inode);
1101     if (inode->i_nlink == 0)
1102         gfs2_unlink_di(inode);
1103     return 0;
1104 }
1105 
1106 
1107 /**
1108  * gfs2_unlink - Unlink an inode (this does rmdir as well)
1109  * @dir: The inode of the directory containing the inode to unlink
1110  * @dentry: The file itself
1111  *
1112  * This routine uses the type of the inode as a flag to figure out
1113  * whether this is an unlink or an rmdir.
1114  *
1115  * Returns: errno
1116  */
1117 
1118 static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
1119 {
1120     struct gfs2_inode *dip = GFS2_I(dir);
1121     struct gfs2_sbd *sdp = GFS2_SB(dir);
1122     struct inode *inode = d_inode(dentry);
1123     struct gfs2_inode *ip = GFS2_I(inode);
1124     struct gfs2_holder ghs[3];
1125     struct gfs2_rgrpd *rgd;
1126     int error;
1127 
1128     error = gfs2_rindex_update(sdp);
1129     if (error)
1130         return error;
1131 
1132     error = -EROFS;
1133 
1134     gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1135     gfs2_holder_init(ip->i_gl,  LM_ST_EXCLUSIVE, 0, ghs + 1);
1136 
1137     rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1138     if (!rgd)
1139         goto out_inodes;
1140 
1141     gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, LM_FLAG_NODE_SCOPE, ghs + 2);
1142 
1143 
1144     error = gfs2_glock_nq(ghs); /* parent */
1145     if (error)
1146         goto out_parent;
1147 
1148     error = gfs2_glock_nq(ghs + 1); /* child */
1149     if (error)
1150         goto out_child;
1151 
1152     error = -ENOENT;
1153     if (inode->i_nlink == 0)
1154         goto out_rgrp;
1155 
1156     if (S_ISDIR(inode->i_mode)) {
1157         error = -ENOTEMPTY;
1158         if (ip->i_entries > 2 || inode->i_nlink > 2)
1159             goto out_rgrp;
1160     }
1161 
1162     error = gfs2_glock_nq(ghs + 2); /* rgrp */
1163     if (error)
1164         goto out_rgrp;
1165 
1166     error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
1167     if (error)
1168         goto out_gunlock;
1169 
1170     error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0);
1171     if (error)
1172         goto out_gunlock;
1173 
1174     error = gfs2_unlink_inode(dip, dentry);
1175     gfs2_trans_end(sdp);
1176 
1177 out_gunlock:
1178     gfs2_glock_dq(ghs + 2);
1179 out_rgrp:
1180     gfs2_glock_dq(ghs + 1);
1181 out_child:
1182     gfs2_glock_dq(ghs);
1183 out_parent:
1184     gfs2_holder_uninit(ghs + 2);
1185 out_inodes:
1186     gfs2_holder_uninit(ghs + 1);
1187     gfs2_holder_uninit(ghs);
1188     return error;
1189 }
1190 
1191 /**
1192  * gfs2_symlink - Create a symlink
1193  * @mnt_userns: User namespace of the mount the inode was found from
1194  * @dir: The directory to create the symlink in
1195  * @dentry: The dentry to put the symlink in
1196  * @symname: The thing which the link points to
1197  *
1198  * Returns: errno
1199  */
1200 
1201 static int gfs2_symlink(struct user_namespace *mnt_userns, struct inode *dir,
1202             struct dentry *dentry, const char *symname)
1203 {
1204     unsigned int size;
1205 
1206     size = strlen(symname);
1207     if (size >= gfs2_max_stuffed_size(GFS2_I(dir)))
1208         return -ENAMETOOLONG;
1209 
1210     return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0);
1211 }
1212 
1213 /**
1214  * gfs2_mkdir - Make a directory
1215  * @mnt_userns: User namespace of the mount the inode was found from
1216  * @dir: The parent directory of the new one
1217  * @dentry: The dentry of the new directory
1218  * @mode: The mode of the new directory
1219  *
1220  * Returns: errno
1221  */
1222 
1223 static int gfs2_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
1224               struct dentry *dentry, umode_t mode)
1225 {
1226     unsigned dsize = gfs2_max_stuffed_size(GFS2_I(dir));
1227     return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0);
1228 }
1229 
1230 /**
1231  * gfs2_mknod - Make a special file
1232  * @mnt_userns: User namespace of the mount the inode was found from
1233  * @dir: The directory in which the special file will reside
1234  * @dentry: The dentry of the special file
1235  * @mode: The mode of the special file
1236  * @dev: The device specification of the special file
1237  *
1238  */
1239 
1240 static int gfs2_mknod(struct user_namespace *mnt_userns, struct inode *dir,
1241               struct dentry *dentry, umode_t mode, dev_t dev)
1242 {
1243     return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0);
1244 }
1245 
1246 /**
1247  * gfs2_atomic_open - Atomically open a file
1248  * @dir: The directory
1249  * @dentry: The proposed new entry
1250  * @file: The proposed new struct file
1251  * @flags: open flags
1252  * @mode: File mode
1253  *
1254  * Returns: error code or 0 for success
1255  */
1256 
1257 static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry,
1258                 struct file *file, unsigned flags,
1259                 umode_t mode)
1260 {
1261     struct dentry *d;
1262     bool excl = !!(flags & O_EXCL);
1263 
1264     if (!d_in_lookup(dentry))
1265         goto skip_lookup;
1266 
1267     d = __gfs2_lookup(dir, dentry, file);
1268     if (IS_ERR(d))
1269         return PTR_ERR(d);
1270     if (d != NULL)
1271         dentry = d;
1272     if (d_really_is_positive(dentry)) {
1273         if (!(file->f_mode & FMODE_OPENED))
1274             return finish_no_open(file, d);
1275         dput(d);
1276         return excl && (flags & O_CREAT) ? -EEXIST : 0;
1277     }
1278 
1279     BUG_ON(d != NULL);
1280 
1281 skip_lookup:
1282     if (!(flags & O_CREAT))
1283         return -ENOENT;
1284 
1285     return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl);
1286 }
1287 
1288 /*
1289  * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1290  * @this: move this
1291  * @to: to here
1292  *
1293  * Follow @to back to the root and make sure we don't encounter @this
1294  * Assumes we already hold the rename lock.
1295  *
1296  * Returns: errno
1297  */
1298 
1299 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1300 {
1301     struct inode *dir = &to->i_inode;
1302     struct super_block *sb = dir->i_sb;
1303     struct inode *tmp;
1304     int error = 0;
1305 
1306     igrab(dir);
1307 
1308     for (;;) {
1309         if (dir == &this->i_inode) {
1310             error = -EINVAL;
1311             break;
1312         }
1313         if (dir == d_inode(sb->s_root)) {
1314             error = 0;
1315             break;
1316         }
1317 
1318         tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
1319         if (!tmp) {
1320             error = -ENOENT;
1321             break;
1322         }
1323         if (IS_ERR(tmp)) {
1324             error = PTR_ERR(tmp);
1325             break;
1326         }
1327 
1328         iput(dir);
1329         dir = tmp;
1330     }
1331 
1332     iput(dir);
1333 
1334     return error;
1335 }
1336 
1337 /**
1338  * update_moved_ino - Update an inode that's being moved
1339  * @ip: The inode being moved
1340  * @ndip: The parent directory of the new filename
1341  * @dir_rename: True of ip is a directory
1342  *
1343  * Returns: errno
1344  */
1345 
1346 static int update_moved_ino(struct gfs2_inode *ip, struct gfs2_inode *ndip,
1347                 int dir_rename)
1348 {
1349     if (dir_rename)
1350         return gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);
1351 
1352     ip->i_inode.i_ctime = current_time(&ip->i_inode);
1353     mark_inode_dirty_sync(&ip->i_inode);
1354     return 0;
1355 }
1356 
1357 
1358 /**
1359  * gfs2_rename - Rename a file
1360  * @odir: Parent directory of old file name
1361  * @odentry: The old dentry of the file
1362  * @ndir: Parent directory of new file name
1363  * @ndentry: The new dentry of the file
1364  *
1365  * Returns: errno
1366  */
1367 
1368 static int gfs2_rename(struct inode *odir, struct dentry *odentry,
1369                struct inode *ndir, struct dentry *ndentry)
1370 {
1371     struct gfs2_inode *odip = GFS2_I(odir);
1372     struct gfs2_inode *ndip = GFS2_I(ndir);
1373     struct gfs2_inode *ip = GFS2_I(d_inode(odentry));
1374     struct gfs2_inode *nip = NULL;
1375     struct gfs2_sbd *sdp = GFS2_SB(odir);
1376     struct gfs2_holder ghs[4], r_gh, rd_gh;
1377     struct gfs2_rgrpd *nrgd;
1378     unsigned int num_gh;
1379     int dir_rename = 0;
1380     struct gfs2_diradd da = { .nr_blocks = 0, .save_loc = 0, };
1381     unsigned int x;
1382     int error;
1383 
1384     gfs2_holder_mark_uninitialized(&r_gh);
1385     gfs2_holder_mark_uninitialized(&rd_gh);
1386     if (d_really_is_positive(ndentry)) {
1387         nip = GFS2_I(d_inode(ndentry));
1388         if (ip == nip)
1389             return 0;
1390     }
1391 
1392     error = gfs2_rindex_update(sdp);
1393     if (error)
1394         return error;
1395 
1396     error = gfs2_qa_get(ndip);
1397     if (error)
1398         return error;
1399 
1400     if (odip != ndip) {
1401         error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1402                        0, &r_gh);
1403         if (error)
1404             goto out;
1405 
1406         if (S_ISDIR(ip->i_inode.i_mode)) {
1407             dir_rename = 1;
1408             /* don't move a directory into its subdir */
1409             error = gfs2_ok_to_move(ip, ndip);
1410             if (error)
1411                 goto out_gunlock_r;
1412         }
1413     }
1414 
1415     num_gh = 1;
1416     gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs);
1417     if (odip != ndip) {
1418         gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE,GL_ASYNC,
1419                  ghs + num_gh);
1420         num_gh++;
1421     }
1422     gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh);
1423     num_gh++;
1424 
1425     if (nip) {
1426         gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC,
1427                  ghs + num_gh);
1428         num_gh++;
1429     }
1430 
1431     for (x = 0; x < num_gh; x++) {
1432         error = gfs2_glock_nq(ghs + x);
1433         if (error)
1434             goto out_gunlock;
1435     }
1436     error = gfs2_glock_async_wait(num_gh, ghs);
1437     if (error)
1438         goto out_gunlock;
1439 
1440     if (nip) {
1441         /* Grab the resource group glock for unlink flag twiddling.
1442          * This is the case where the target dinode already exists
1443          * so we unlink before doing the rename.
1444          */
1445         nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1);
1446         if (!nrgd) {
1447             error = -ENOENT;
1448             goto out_gunlock;
1449         }
1450         error = gfs2_glock_nq_init(nrgd->rd_gl, LM_ST_EXCLUSIVE,
1451                        LM_FLAG_NODE_SCOPE, &rd_gh);
1452         if (error)
1453             goto out_gunlock;
1454     }
1455 
1456     error = -ENOENT;
1457     if (ip->i_inode.i_nlink == 0)
1458         goto out_gunlock;
1459 
1460     /* Check out the old directory */
1461 
1462     error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
1463     if (error)
1464         goto out_gunlock;
1465 
1466     /* Check out the new directory */
1467 
1468     if (nip) {
1469         error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1470         if (error)
1471             goto out_gunlock;
1472 
1473         if (nip->i_inode.i_nlink == 0) {
1474             error = -EAGAIN;
1475             goto out_gunlock;
1476         }
1477 
1478         if (S_ISDIR(nip->i_inode.i_mode)) {
1479             if (nip->i_entries < 2) {
1480                 gfs2_consist_inode(nip);
1481                 error = -EIO;
1482                 goto out_gunlock;
1483             }
1484             if (nip->i_entries > 2) {
1485                 error = -ENOTEMPTY;
1486                 goto out_gunlock;
1487             }
1488         }
1489     } else {
1490         error = gfs2_permission(&init_user_ns, ndir,
1491                     MAY_WRITE | MAY_EXEC);
1492         if (error)
1493             goto out_gunlock;
1494 
1495         error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
1496         switch (error) {
1497         case -ENOENT:
1498             error = 0;
1499             break;
1500         case 0:
1501             error = -EEXIST;
1502             goto out_gunlock;
1503         default:
1504             goto out_gunlock;
1505         }
1506 
1507         if (odip != ndip) {
1508             if (!ndip->i_inode.i_nlink) {
1509                 error = -ENOENT;
1510                 goto out_gunlock;
1511             }
1512             if (ndip->i_entries == (u32)-1) {
1513                 error = -EFBIG;
1514                 goto out_gunlock;
1515             }
1516             if (S_ISDIR(ip->i_inode.i_mode) &&
1517                 ndip->i_inode.i_nlink == (u32)-1) {
1518                 error = -EMLINK;
1519                 goto out_gunlock;
1520             }
1521         }
1522     }
1523 
1524     /* Check out the dir to be renamed */
1525 
1526     if (dir_rename) {
1527         error = gfs2_permission(&init_user_ns, d_inode(odentry),
1528                     MAY_WRITE);
1529         if (error)
1530             goto out_gunlock;
1531     }
1532 
1533     if (nip == NULL) {
1534         error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da);
1535         if (error)
1536             goto out_gunlock;
1537     }
1538 
1539     if (da.nr_blocks) {
1540         struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
1541         error = gfs2_quota_lock_check(ndip, &ap);
1542         if (error)
1543             goto out_gunlock;
1544 
1545         error = gfs2_inplace_reserve(ndip, &ap);
1546         if (error)
1547             goto out_gunlock_q;
1548 
1549         error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) +
1550                      4 * RES_LEAF + 4, 0);
1551         if (error)
1552             goto out_ipreserv;
1553     } else {
1554         error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
1555                      5 * RES_LEAF + 4, 0);
1556         if (error)
1557             goto out_gunlock;
1558     }
1559 
1560     /* Remove the target file, if it exists */
1561 
1562     if (nip)
1563         error = gfs2_unlink_inode(ndip, ndentry);
1564 
1565     error = update_moved_ino(ip, ndip, dir_rename);
1566     if (error)
1567         goto out_end_trans;
1568 
1569     error = gfs2_dir_del(odip, odentry);
1570     if (error)
1571         goto out_end_trans;
1572 
1573     error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da);
1574     if (error)
1575         goto out_end_trans;
1576 
1577 out_end_trans:
1578     gfs2_trans_end(sdp);
1579 out_ipreserv:
1580     if (da.nr_blocks)
1581         gfs2_inplace_release(ndip);
1582 out_gunlock_q:
1583     if (da.nr_blocks)
1584         gfs2_quota_unlock(ndip);
1585 out_gunlock:
1586     gfs2_dir_no_add(&da);
1587     if (gfs2_holder_initialized(&rd_gh))
1588         gfs2_glock_dq_uninit(&rd_gh);
1589 
1590     while (x--) {
1591         if (gfs2_holder_queued(ghs + x))
1592             gfs2_glock_dq(ghs + x);
1593         gfs2_holder_uninit(ghs + x);
1594     }
1595 out_gunlock_r:
1596     if (gfs2_holder_initialized(&r_gh))
1597         gfs2_glock_dq_uninit(&r_gh);
1598 out:
1599     gfs2_qa_put(ndip);
1600     return error;
1601 }
1602 
1603 /**
1604  * gfs2_exchange - exchange two files
1605  * @odir: Parent directory of old file name
1606  * @odentry: The old dentry of the file
1607  * @ndir: Parent directory of new file name
1608  * @ndentry: The new dentry of the file
1609  * @flags: The rename flags
1610  *
1611  * Returns: errno
1612  */
1613 
1614 static int gfs2_exchange(struct inode *odir, struct dentry *odentry,
1615              struct inode *ndir, struct dentry *ndentry,
1616              unsigned int flags)
1617 {
1618     struct gfs2_inode *odip = GFS2_I(odir);
1619     struct gfs2_inode *ndip = GFS2_I(ndir);
1620     struct gfs2_inode *oip = GFS2_I(odentry->d_inode);
1621     struct gfs2_inode *nip = GFS2_I(ndentry->d_inode);
1622     struct gfs2_sbd *sdp = GFS2_SB(odir);
1623     struct gfs2_holder ghs[4], r_gh;
1624     unsigned int num_gh;
1625     unsigned int x;
1626     umode_t old_mode = oip->i_inode.i_mode;
1627     umode_t new_mode = nip->i_inode.i_mode;
1628     int error;
1629 
1630     gfs2_holder_mark_uninitialized(&r_gh);
1631     error = gfs2_rindex_update(sdp);
1632     if (error)
1633         return error;
1634 
1635     if (odip != ndip) {
1636         error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1637                        0, &r_gh);
1638         if (error)
1639             goto out;
1640 
1641         if (S_ISDIR(old_mode)) {
1642             /* don't move a directory into its subdir */
1643             error = gfs2_ok_to_move(oip, ndip);
1644             if (error)
1645                 goto out_gunlock_r;
1646         }
1647 
1648         if (S_ISDIR(new_mode)) {
1649             /* don't move a directory into its subdir */
1650             error = gfs2_ok_to_move(nip, odip);
1651             if (error)
1652                 goto out_gunlock_r;
1653         }
1654     }
1655 
1656     num_gh = 1;
1657     gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs);
1658     if (odip != ndip) {
1659         gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC,
1660                  ghs + num_gh);
1661         num_gh++;
1662     }
1663     gfs2_holder_init(oip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh);
1664     num_gh++;
1665 
1666     gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh);
1667     num_gh++;
1668 
1669     for (x = 0; x < num_gh; x++) {
1670         error = gfs2_glock_nq(ghs + x);
1671         if (error)
1672             goto out_gunlock;
1673     }
1674 
1675     error = gfs2_glock_async_wait(num_gh, ghs);
1676     if (error)
1677         goto out_gunlock;
1678 
1679     error = -ENOENT;
1680     if (oip->i_inode.i_nlink == 0 || nip->i_inode.i_nlink == 0)
1681         goto out_gunlock;
1682 
1683     error = gfs2_unlink_ok(odip, &odentry->d_name, oip);
1684     if (error)
1685         goto out_gunlock;
1686     error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1687     if (error)
1688         goto out_gunlock;
1689 
1690     if (S_ISDIR(old_mode)) {
1691         error = gfs2_permission(&init_user_ns, odentry->d_inode,
1692                     MAY_WRITE);
1693         if (error)
1694             goto out_gunlock;
1695     }
1696     if (S_ISDIR(new_mode)) {
1697         error = gfs2_permission(&init_user_ns, ndentry->d_inode,
1698                     MAY_WRITE);
1699         if (error)
1700             goto out_gunlock;
1701     }
1702     error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 4 * RES_LEAF, 0);
1703     if (error)
1704         goto out_gunlock;
1705 
1706     error = update_moved_ino(oip, ndip, S_ISDIR(old_mode));
1707     if (error)
1708         goto out_end_trans;
1709 
1710     error = update_moved_ino(nip, odip, S_ISDIR(new_mode));
1711     if (error)
1712         goto out_end_trans;
1713 
1714     error = gfs2_dir_mvino(ndip, &ndentry->d_name, oip,
1715                    IF2DT(old_mode));
1716     if (error)
1717         goto out_end_trans;
1718 
1719     error = gfs2_dir_mvino(odip, &odentry->d_name, nip,
1720                    IF2DT(new_mode));
1721     if (error)
1722         goto out_end_trans;
1723 
1724     if (odip != ndip) {
1725         if (S_ISDIR(new_mode) && !S_ISDIR(old_mode)) {
1726             inc_nlink(&odip->i_inode);
1727             drop_nlink(&ndip->i_inode);
1728         } else if (S_ISDIR(old_mode) && !S_ISDIR(new_mode)) {
1729             inc_nlink(&ndip->i_inode);
1730             drop_nlink(&odip->i_inode);
1731         }
1732     }
1733     mark_inode_dirty(&ndip->i_inode);
1734     if (odip != ndip)
1735         mark_inode_dirty(&odip->i_inode);
1736 
1737 out_end_trans:
1738     gfs2_trans_end(sdp);
1739 out_gunlock:
1740     while (x--) {
1741         if (gfs2_holder_queued(ghs + x))
1742             gfs2_glock_dq(ghs + x);
1743         gfs2_holder_uninit(ghs + x);
1744     }
1745 out_gunlock_r:
1746     if (gfs2_holder_initialized(&r_gh))
1747         gfs2_glock_dq_uninit(&r_gh);
1748 out:
1749     return error;
1750 }
1751 
1752 static int gfs2_rename2(struct user_namespace *mnt_userns, struct inode *odir,
1753             struct dentry *odentry, struct inode *ndir,
1754             struct dentry *ndentry, unsigned int flags)
1755 {
1756     flags &= ~RENAME_NOREPLACE;
1757 
1758     if (flags & ~RENAME_EXCHANGE)
1759         return -EINVAL;
1760 
1761     if (flags & RENAME_EXCHANGE)
1762         return gfs2_exchange(odir, odentry, ndir, ndentry, flags);
1763 
1764     return gfs2_rename(odir, odentry, ndir, ndentry);
1765 }
1766 
1767 /**
1768  * gfs2_get_link - Follow a symbolic link
1769  * @dentry: The dentry of the link
1770  * @inode: The inode of the link
1771  * @done: destructor for return value
1772  *
1773  * This can handle symlinks of any size.
1774  *
1775  * Returns: 0 on success or error code
1776  */
1777 
1778 static const char *gfs2_get_link(struct dentry *dentry,
1779                  struct inode *inode,
1780                  struct delayed_call *done)
1781 {
1782     struct gfs2_inode *ip = GFS2_I(inode);
1783     struct gfs2_holder i_gh;
1784     struct buffer_head *dibh;
1785     unsigned int size;
1786     char *buf;
1787     int error;
1788 
1789     if (!dentry)
1790         return ERR_PTR(-ECHILD);
1791 
1792     gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1793     error = gfs2_glock_nq(&i_gh);
1794     if (error) {
1795         gfs2_holder_uninit(&i_gh);
1796         return ERR_PTR(error);
1797     }
1798 
1799     size = (unsigned int)i_size_read(&ip->i_inode);
1800     if (size == 0) {
1801         gfs2_consist_inode(ip);
1802         buf = ERR_PTR(-EIO);
1803         goto out;
1804     }
1805 
1806     error = gfs2_meta_inode_buffer(ip, &dibh);
1807     if (error) {
1808         buf = ERR_PTR(error);
1809         goto out;
1810     }
1811 
1812     buf = kzalloc(size + 1, GFP_NOFS);
1813     if (!buf)
1814         buf = ERR_PTR(-ENOMEM);
1815     else
1816         memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
1817     brelse(dibh);
1818 out:
1819     gfs2_glock_dq_uninit(&i_gh);
1820     if (!IS_ERR(buf))
1821         set_delayed_call(done, kfree_link, buf);
1822     return buf;
1823 }
1824 
1825 /**
1826  * gfs2_permission
1827  * @mnt_userns: User namespace of the mount the inode was found from
1828  * @inode: The inode
1829  * @mask: The mask to be tested
1830  *
1831  * This may be called from the VFS directly, or from within GFS2 with the
1832  * inode locked, so we look to see if the glock is already locked and only
1833  * lock the glock if its not already been done.
1834  *
1835  * Returns: errno
1836  */
1837 
1838 int gfs2_permission(struct user_namespace *mnt_userns, struct inode *inode,
1839             int mask)
1840 {
1841     struct gfs2_inode *ip;
1842     struct gfs2_holder i_gh;
1843     int error;
1844 
1845     gfs2_holder_mark_uninitialized(&i_gh);
1846     ip = GFS2_I(inode);
1847     if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1848         if (mask & MAY_NOT_BLOCK)
1849             return -ECHILD;
1850         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1851         if (error)
1852             return error;
1853     }
1854 
1855     if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1856         error = -EPERM;
1857     else
1858         error = generic_permission(&init_user_ns, inode, mask);
1859     if (gfs2_holder_initialized(&i_gh))
1860         gfs2_glock_dq_uninit(&i_gh);
1861 
1862     return error;
1863 }
1864 
1865 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1866 {
1867     setattr_copy(&init_user_ns, inode, attr);
1868     mark_inode_dirty(inode);
1869     return 0;
1870 }
1871 
1872 static int gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1873 {
1874     int error;
1875 
1876     if (current->journal_info)
1877         return __gfs2_setattr_simple(inode, attr);
1878 
1879     error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0);
1880     if (error)
1881         return error;
1882 
1883     error = __gfs2_setattr_simple(inode, attr);
1884     gfs2_trans_end(GFS2_SB(inode));
1885     return error;
1886 }
1887 
1888 static int setattr_chown(struct inode *inode, struct iattr *attr)
1889 {
1890     struct gfs2_inode *ip = GFS2_I(inode);
1891     struct gfs2_sbd *sdp = GFS2_SB(inode);
1892     kuid_t ouid, nuid;
1893     kgid_t ogid, ngid;
1894     int error;
1895     struct gfs2_alloc_parms ap;
1896 
1897     ouid = inode->i_uid;
1898     ogid = inode->i_gid;
1899     nuid = attr->ia_uid;
1900     ngid = attr->ia_gid;
1901 
1902     if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid))
1903         ouid = nuid = NO_UID_QUOTA_CHANGE;
1904     if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid))
1905         ogid = ngid = NO_GID_QUOTA_CHANGE;
1906     error = gfs2_qa_get(ip);
1907     if (error)
1908         return error;
1909 
1910     error = gfs2_rindex_update(sdp);
1911     if (error)
1912         goto out;
1913 
1914     error = gfs2_quota_lock(ip, nuid, ngid);
1915     if (error)
1916         goto out;
1917 
1918     ap.target = gfs2_get_inode_blocks(&ip->i_inode);
1919 
1920     if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1921         !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1922         error = gfs2_quota_check(ip, nuid, ngid, &ap);
1923         if (error)
1924             goto out_gunlock_q;
1925     }
1926 
1927     error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1928     if (error)
1929         goto out_gunlock_q;
1930 
1931     error = gfs2_setattr_simple(inode, attr);
1932     if (error)
1933         goto out_end_trans;
1934 
1935     if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1936         !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1937         gfs2_quota_change(ip, -(s64)ap.target, ouid, ogid);
1938         gfs2_quota_change(ip, ap.target, nuid, ngid);
1939     }
1940 
1941 out_end_trans:
1942     gfs2_trans_end(sdp);
1943 out_gunlock_q:
1944     gfs2_quota_unlock(ip);
1945 out:
1946     gfs2_qa_put(ip);
1947     return error;
1948 }
1949 
1950 /**
1951  * gfs2_setattr - Change attributes on an inode
1952  * @mnt_userns: User namespace of the mount the inode was found from
1953  * @dentry: The dentry which is changing
1954  * @attr: The structure describing the change
1955  *
1956  * The VFS layer wants to change one or more of an inodes attributes.  Write
1957  * that change out to disk.
1958  *
1959  * Returns: errno
1960  */
1961 
1962 static int gfs2_setattr(struct user_namespace *mnt_userns,
1963             struct dentry *dentry, struct iattr *attr)
1964 {
1965     struct inode *inode = d_inode(dentry);
1966     struct gfs2_inode *ip = GFS2_I(inode);
1967     struct gfs2_holder i_gh;
1968     int error;
1969 
1970     error = gfs2_qa_get(ip);
1971     if (error)
1972         return error;
1973 
1974     error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1975     if (error)
1976         goto out;
1977 
1978     error = may_setattr(&init_user_ns, inode, attr->ia_valid);
1979     if (error)
1980         goto error;
1981 
1982     error = setattr_prepare(&init_user_ns, dentry, attr);
1983     if (error)
1984         goto error;
1985 
1986     if (attr->ia_valid & ATTR_SIZE)
1987         error = gfs2_setattr_size(inode, attr->ia_size);
1988     else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1989         error = setattr_chown(inode, attr);
1990     else {
1991         error = gfs2_setattr_simple(inode, attr);
1992         if (!error && attr->ia_valid & ATTR_MODE)
1993             error = posix_acl_chmod(&init_user_ns, inode,
1994                         inode->i_mode);
1995     }
1996 
1997 error:
1998     if (!error)
1999         mark_inode_dirty(inode);
2000     gfs2_glock_dq_uninit(&i_gh);
2001 out:
2002     gfs2_qa_put(ip);
2003     return error;
2004 }
2005 
2006 /**
2007  * gfs2_getattr - Read out an inode's attributes
2008  * @mnt_userns: user namespace of the mount the inode was found from
2009  * @path: Object to query
2010  * @stat: The inode's stats
2011  * @request_mask: Mask of STATX_xxx flags indicating the caller's interests
2012  * @flags: AT_STATX_xxx setting
2013  *
2014  * This may be called from the VFS directly, or from within GFS2 with the
2015  * inode locked, so we look to see if the glock is already locked and only
2016  * lock the glock if its not already been done. Note that its the NFS
2017  * readdirplus operation which causes this to be called (from filldir)
2018  * with the glock already held.
2019  *
2020  * Returns: errno
2021  */
2022 
2023 static int gfs2_getattr(struct user_namespace *mnt_userns,
2024             const struct path *path, struct kstat *stat,
2025             u32 request_mask, unsigned int flags)
2026 {
2027     struct inode *inode = d_inode(path->dentry);
2028     struct gfs2_inode *ip = GFS2_I(inode);
2029     struct gfs2_holder gh;
2030     u32 gfsflags;
2031     int error;
2032 
2033     gfs2_holder_mark_uninitialized(&gh);
2034     if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
2035         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
2036         if (error)
2037             return error;
2038     }
2039 
2040     gfsflags = ip->i_diskflags;
2041     if (gfsflags & GFS2_DIF_APPENDONLY)
2042         stat->attributes |= STATX_ATTR_APPEND;
2043     if (gfsflags & GFS2_DIF_IMMUTABLE)
2044         stat->attributes |= STATX_ATTR_IMMUTABLE;
2045 
2046     stat->attributes_mask |= (STATX_ATTR_APPEND |
2047                   STATX_ATTR_COMPRESSED |
2048                   STATX_ATTR_ENCRYPTED |
2049                   STATX_ATTR_IMMUTABLE |
2050                   STATX_ATTR_NODUMP);
2051 
2052     generic_fillattr(&init_user_ns, inode, stat);
2053 
2054     if (gfs2_holder_initialized(&gh))
2055         gfs2_glock_dq_uninit(&gh);
2056 
2057     return 0;
2058 }
2059 
2060 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
2061                u64 start, u64 len)
2062 {
2063     struct gfs2_inode *ip = GFS2_I(inode);
2064     struct gfs2_holder gh;
2065     int ret;
2066 
2067     inode_lock_shared(inode);
2068 
2069     ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2070     if (ret)
2071         goto out;
2072 
2073     ret = iomap_fiemap(inode, fieinfo, start, len, &gfs2_iomap_ops);
2074 
2075     gfs2_glock_dq_uninit(&gh);
2076 
2077 out:
2078     inode_unlock_shared(inode);
2079     return ret;
2080 }
2081 
2082 loff_t gfs2_seek_data(struct file *file, loff_t offset)
2083 {
2084     struct inode *inode = file->f_mapping->host;
2085     struct gfs2_inode *ip = GFS2_I(inode);
2086     struct gfs2_holder gh;
2087     loff_t ret;
2088 
2089     inode_lock_shared(inode);
2090     ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2091     if (!ret)
2092         ret = iomap_seek_data(inode, offset, &gfs2_iomap_ops);
2093     gfs2_glock_dq_uninit(&gh);
2094     inode_unlock_shared(inode);
2095 
2096     if (ret < 0)
2097         return ret;
2098     return vfs_setpos(file, ret, inode->i_sb->s_maxbytes);
2099 }
2100 
2101 loff_t gfs2_seek_hole(struct file *file, loff_t offset)
2102 {
2103     struct inode *inode = file->f_mapping->host;
2104     struct gfs2_inode *ip = GFS2_I(inode);
2105     struct gfs2_holder gh;
2106     loff_t ret;
2107 
2108     inode_lock_shared(inode);
2109     ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2110     if (!ret)
2111         ret = iomap_seek_hole(inode, offset, &gfs2_iomap_ops);
2112     gfs2_glock_dq_uninit(&gh);
2113     inode_unlock_shared(inode);
2114 
2115     if (ret < 0)
2116         return ret;
2117     return vfs_setpos(file, ret, inode->i_sb->s_maxbytes);
2118 }
2119 
2120 static int gfs2_update_time(struct inode *inode, struct timespec64 *time,
2121                 int flags)
2122 {
2123     struct gfs2_inode *ip = GFS2_I(inode);
2124     struct gfs2_glock *gl = ip->i_gl;
2125     struct gfs2_holder *gh;
2126     int error;
2127 
2128     gh = gfs2_glock_is_locked_by_me(gl);
2129     if (gh && !gfs2_glock_is_held_excl(gl)) {
2130         gfs2_glock_dq(gh);
2131         gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, gh);
2132         error = gfs2_glock_nq(gh);
2133         if (error)
2134             return error;
2135     }
2136     return generic_update_time(inode, time, flags);
2137 }
2138 
2139 static const struct inode_operations gfs2_file_iops = {
2140     .permission = gfs2_permission,
2141     .setattr = gfs2_setattr,
2142     .getattr = gfs2_getattr,
2143     .listxattr = gfs2_listxattr,
2144     .fiemap = gfs2_fiemap,
2145     .get_acl = gfs2_get_acl,
2146     .set_acl = gfs2_set_acl,
2147     .update_time = gfs2_update_time,
2148     .fileattr_get = gfs2_fileattr_get,
2149     .fileattr_set = gfs2_fileattr_set,
2150 };
2151 
2152 static const struct inode_operations gfs2_dir_iops = {
2153     .create = gfs2_create,
2154     .lookup = gfs2_lookup,
2155     .link = gfs2_link,
2156     .unlink = gfs2_unlink,
2157     .symlink = gfs2_symlink,
2158     .mkdir = gfs2_mkdir,
2159     .rmdir = gfs2_unlink,
2160     .mknod = gfs2_mknod,
2161     .rename = gfs2_rename2,
2162     .permission = gfs2_permission,
2163     .setattr = gfs2_setattr,
2164     .getattr = gfs2_getattr,
2165     .listxattr = gfs2_listxattr,
2166     .fiemap = gfs2_fiemap,
2167     .get_acl = gfs2_get_acl,
2168     .set_acl = gfs2_set_acl,
2169     .update_time = gfs2_update_time,
2170     .atomic_open = gfs2_atomic_open,
2171     .fileattr_get = gfs2_fileattr_get,
2172     .fileattr_set = gfs2_fileattr_set,
2173 };
2174 
2175 static const struct inode_operations gfs2_symlink_iops = {
2176     .get_link = gfs2_get_link,
2177     .permission = gfs2_permission,
2178     .setattr = gfs2_setattr,
2179     .getattr = gfs2_getattr,
2180     .listxattr = gfs2_listxattr,
2181     .fiemap = gfs2_fiemap,
2182 };
2183
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