1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
4 * Copyright (C) 2004-2011 Red Hat, Inc. All rights reserved.
7 #include <linux/slab.h>
8 #include <linux/spinlock.h>
9 #include <linux/completion.h>
10 #include <linux/buffer_head.h>
11 #include <linux/namei.h>
13 #include <linux/cred.h>
14 #include <linux/xattr.h>
15 #include <linux/posix_acl.h>
16 #include <linux/gfs2_ondisk.h>
17 #include <linux/crc32.h>
18 #include <linux/iomap.h>
19 #include <linux/security.h>
20 #include <linux/fiemap.h>
21 #include <linux/uaccess.h>
39 static const struct inode_operations gfs2_file_iops;
40 static const struct inode_operations gfs2_dir_iops;
41 static const struct inode_operations gfs2_symlink_iops;
43 static int iget_test(struct inode *inode, void *opaque)
45 u64 no_addr = *(u64 *)opaque;
47 return GFS2_I(inode)->i_no_addr == no_addr;
50 static int iget_set(struct inode *inode, void *opaque)
52 u64 no_addr = *(u64 *)opaque;
54 GFS2_I(inode)->i_no_addr = no_addr;
55 inode->i_ino = no_addr;
59 static struct inode *gfs2_iget(struct super_block *sb, u64 no_addr)
64 inode = iget5_locked(sb, no_addr, iget_test, iget_set, &no_addr);
67 if (is_bad_inode(inode)) {
75 * gfs2_set_iop - Sets inode operations
76 * @inode: The inode with correct i_mode filled in
78 * GFS2 lookup code fills in vfs inode contents based on info obtained
79 * from directory entry inside gfs2_inode_lookup().
82 static void gfs2_set_iop(struct inode *inode)
84 struct gfs2_sbd *sdp = GFS2_SB(inode);
85 umode_t mode = inode->i_mode;
88 inode->i_op = &gfs2_file_iops;
89 if (gfs2_localflocks(sdp))
90 inode->i_fop = &gfs2_file_fops_nolock;
92 inode->i_fop = &gfs2_file_fops;
93 } else if (S_ISDIR(mode)) {
94 inode->i_op = &gfs2_dir_iops;
95 if (gfs2_localflocks(sdp))
96 inode->i_fop = &gfs2_dir_fops_nolock;
98 inode->i_fop = &gfs2_dir_fops;
99 } else if (S_ISLNK(mode)) {
100 inode->i_op = &gfs2_symlink_iops;
102 inode->i_op = &gfs2_file_iops;
103 init_special_inode(inode, inode->i_mode, inode->i_rdev);
108 * gfs2_inode_lookup - Lookup an inode
109 * @sb: The super block
110 * @type: The type of the inode
111 * @no_addr: The inode number
112 * @no_formal_ino: The inode generation number
113 * @blktype: Requested block type (GFS2_BLKST_DINODE or GFS2_BLKST_UNLINKED;
114 * GFS2_BLKST_FREE to indicate not to verify)
116 * If @type is DT_UNKNOWN, the inode type is fetched from disk.
118 * If @blktype is anything other than GFS2_BLKST_FREE (which is used as a
119 * placeholder because it doesn't otherwise make sense), the on-disk block type
120 * is verified to be @blktype.
122 * When @no_formal_ino is non-zero, this function will return ERR_PTR(-ESTALE)
123 * if it detects that @no_formal_ino doesn't match the actual inode generation
124 * number. However, it doesn't always know unless @type is DT_UNKNOWN.
126 * Returns: A VFS inode, or an error
129 struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type,
130 u64 no_addr, u64 no_formal_ino,
131 unsigned int blktype)
134 struct gfs2_inode *ip;
135 struct gfs2_glock *io_gl = NULL;
136 struct gfs2_holder i_gh;
139 gfs2_holder_mark_uninitialized(&i_gh);
140 inode = gfs2_iget(sb, no_addr);
142 return ERR_PTR(-ENOMEM);
146 if (inode->i_state & I_NEW) {
147 struct gfs2_sbd *sdp = GFS2_SB(inode);
149 error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
152 flush_delayed_work(&ip->i_gl->gl_work);
154 error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
157 if (blktype != GFS2_BLKST_UNLINKED)
158 gfs2_cancel_delete_work(io_gl);
160 if (type == DT_UNKNOWN || blktype != GFS2_BLKST_FREE) {
162 * The GL_SKIP flag indicates to skip reading the inode
163 * block. We read the inode with gfs2_inode_refresh
164 * after possibly checking the block type.
166 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE,
173 gfs2_inode_already_deleted(ip->i_gl, no_formal_ino))
176 if (blktype != GFS2_BLKST_FREE) {
177 error = gfs2_check_blk_type(sdp, no_addr,
184 glock_set_object(ip->i_gl, ip);
185 set_bit(GLF_INSTANTIATE_NEEDED, &ip->i_gl->gl_flags);
186 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
189 glock_set_object(ip->i_iopen_gh.gh_gl, ip);
190 gfs2_glock_put(io_gl);
193 /* Lowest possible timestamp; will be overwritten in gfs2_dinode_in. */
194 inode->i_atime.tv_sec = 1LL << (8 * sizeof(inode->i_atime.tv_sec) - 1);
195 inode->i_atime.tv_nsec = 0;
197 if (type == DT_UNKNOWN) {
198 /* Inode glock must be locked already */
199 error = gfs2_instantiate(&i_gh);
203 ip->i_no_formal_ino = no_formal_ino;
204 inode->i_mode = DT2IF(type);
207 if (gfs2_holder_initialized(&i_gh))
208 gfs2_glock_dq_uninit(&i_gh);
213 if (no_formal_ino && ip->i_no_formal_ino &&
214 no_formal_ino != ip->i_no_formal_ino) {
216 if (inode->i_state & I_NEW)
219 return ERR_PTR(error);
222 if (inode->i_state & I_NEW)
223 unlock_new_inode(inode);
228 if (gfs2_holder_initialized(&ip->i_iopen_gh)) {
229 glock_clear_object(ip->i_iopen_gh.gh_gl, ip);
230 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
233 gfs2_glock_put(io_gl);
234 if (gfs2_holder_initialized(&i_gh))
235 gfs2_glock_dq_uninit(&i_gh);
237 return ERR_PTR(error);
241 * gfs2_lookup_by_inum - look up an inode by inode number
242 * @sdp: The super block
243 * @no_addr: The inode number
244 * @no_formal_ino: The inode generation number (0 for any)
245 * @blktype: Requested block type (see gfs2_inode_lookup)
247 struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr,
248 u64 no_formal_ino, unsigned int blktype)
250 struct super_block *sb = sdp->sd_vfs;
254 inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, no_formal_ino,
261 if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM)
268 return ERR_PTR(error);
272 struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
276 gfs2_str2qstr(&qstr, name);
277 inode = gfs2_lookupi(dip, &qstr, 1);
278 /* gfs2_lookupi has inconsistent callers: vfs
279 * related routines expect NULL for no entry found,
280 * gfs2_lookup_simple callers expect ENOENT
281 * and do not check for NULL.
284 return ERR_PTR(-ENOENT);
291 * gfs2_lookupi - Look up a filename in a directory and return its inode
292 * @dir: The inode of the directory containing the inode to look-up
293 * @name: The name of the inode to look for
294 * @is_root: If 1, ignore the caller's permissions
296 * This can be called via the VFS filldir function when NFS is doing
297 * a readdirplus and the inode which its intending to stat isn't
298 * already in cache. In this case we must not take the directory glock
299 * again, since the readdir call will have already taken that lock.
304 struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
307 struct super_block *sb = dir->i_sb;
308 struct gfs2_inode *dip = GFS2_I(dir);
309 struct gfs2_holder d_gh;
311 struct inode *inode = NULL;
313 gfs2_holder_mark_uninitialized(&d_gh);
314 if (!name->len || name->len > GFS2_FNAMESIZE)
315 return ERR_PTR(-ENAMETOOLONG);
317 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
318 (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
319 dir == d_inode(sb->s_root))) {
324 if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) {
325 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
327 return ERR_PTR(error);
331 error = gfs2_permission(&init_user_ns, dir, MAY_EXEC);
336 inode = gfs2_dir_search(dir, name, false);
338 error = PTR_ERR(inode);
340 if (gfs2_holder_initialized(&d_gh))
341 gfs2_glock_dq_uninit(&d_gh);
342 if (error == -ENOENT)
344 return inode ? inode : ERR_PTR(error);
348 * create_ok - OK to create a new on-disk inode here?
349 * @dip: Directory in which dinode is to be created
350 * @name: Name of new dinode
356 static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
361 error = gfs2_permission(&init_user_ns, &dip->i_inode,
362 MAY_WRITE | MAY_EXEC);
366 /* Don't create entries in an unlinked directory */
367 if (!dip->i_inode.i_nlink)
370 if (dip->i_entries == (u32)-1)
372 if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1)
378 static void munge_mode_uid_gid(const struct gfs2_inode *dip,
381 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
382 (dip->i_inode.i_mode & S_ISUID) &&
383 !uid_eq(dip->i_inode.i_uid, GLOBAL_ROOT_UID)) {
384 if (S_ISDIR(inode->i_mode))
385 inode->i_mode |= S_ISUID;
386 else if (!uid_eq(dip->i_inode.i_uid, current_fsuid()))
387 inode->i_mode &= ~07111;
388 inode->i_uid = dip->i_inode.i_uid;
390 inode->i_uid = current_fsuid();
392 if (dip->i_inode.i_mode & S_ISGID) {
393 if (S_ISDIR(inode->i_mode))
394 inode->i_mode |= S_ISGID;
395 inode->i_gid = dip->i_inode.i_gid;
397 inode->i_gid = current_fsgid();
400 static int alloc_dinode(struct gfs2_inode *ip, u32 flags, unsigned *dblocks)
402 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
403 struct gfs2_alloc_parms ap = { .target = *dblocks, .aflags = flags, };
406 error = gfs2_quota_lock_check(ip, &ap);
410 error = gfs2_inplace_reserve(ip, &ap);
414 error = gfs2_trans_begin(sdp, (*dblocks * RES_RG_BIT) + RES_STATFS + RES_QUOTA, 0);
418 error = gfs2_alloc_blocks(ip, &ip->i_no_addr, dblocks, 1, &ip->i_generation);
419 ip->i_no_formal_ino = ip->i_generation;
420 ip->i_inode.i_ino = ip->i_no_addr;
421 ip->i_goal = ip->i_no_addr;
426 gfs2_inplace_release(ip);
428 gfs2_quota_unlock(ip);
433 static void gfs2_init_dir(struct buffer_head *dibh,
434 const struct gfs2_inode *parent)
436 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
437 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
439 gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent);
440 dent->de_inum = di->di_num; /* already GFS2 endian */
441 dent->de_type = cpu_to_be16(DT_DIR);
443 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
444 gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
445 gfs2_inum_out(parent, dent);
446 dent->de_type = cpu_to_be16(DT_DIR);
451 * gfs2_init_xattr - Initialise an xattr block for a new inode
452 * @ip: The inode in question
454 * This sets up an empty xattr block for a new inode, ready to
455 * take any ACLs, LSM xattrs, etc.
458 static void gfs2_init_xattr(struct gfs2_inode *ip)
460 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
461 struct buffer_head *bh;
462 struct gfs2_ea_header *ea;
464 bh = gfs2_meta_new(ip->i_gl, ip->i_eattr);
465 gfs2_trans_add_meta(ip->i_gl, bh);
466 gfs2_metatype_set(bh, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
467 gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header));
469 ea = GFS2_EA_BH2FIRST(bh);
470 ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
471 ea->ea_type = GFS2_EATYPE_UNUSED;
472 ea->ea_flags = GFS2_EAFLAG_LAST;
478 * init_dinode - Fill in a new dinode structure
479 * @dip: The directory this inode is being created in
481 * @symname: The symlink destination (if a symlink)
485 static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip,
488 struct gfs2_dinode *di;
489 struct buffer_head *dibh;
491 dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr);
492 gfs2_trans_add_meta(ip->i_gl, dibh);
493 di = (struct gfs2_dinode *)dibh->b_data;
494 gfs2_dinode_out(ip, di);
496 di->di_major = cpu_to_be32(imajor(&ip->i_inode));
497 di->di_minor = cpu_to_be32(iminor(&ip->i_inode));
501 memset(&di->__pad4, 0, sizeof(di->__pad4));
502 memset(&di->di_reserved, 0, sizeof(di->di_reserved));
503 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
505 switch(ip->i_inode.i_mode & S_IFMT) {
507 gfs2_init_dir(dibh, dip);
510 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size);
514 set_buffer_uptodate(dibh);
519 * gfs2_trans_da_blks - Calculate number of blocks to link inode
520 * @dip: The directory we are linking into
521 * @da: The dir add information
522 * @nr_inodes: The number of inodes involved
524 * This calculate the number of blocks we need to reserve in a
525 * transaction to link @nr_inodes into a directory. In most cases
526 * @nr_inodes will be 2 (the directory plus the inode being linked in)
527 * but in case of rename, 4 may be required.
529 * Returns: Number of blocks
532 static unsigned gfs2_trans_da_blks(const struct gfs2_inode *dip,
533 const struct gfs2_diradd *da,
536 return da->nr_blocks + gfs2_rg_blocks(dip, da->nr_blocks) +
537 (nr_inodes * RES_DINODE) + RES_QUOTA + RES_STATFS;
540 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
541 struct gfs2_inode *ip, struct gfs2_diradd *da)
543 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
544 struct gfs2_alloc_parms ap = { .target = da->nr_blocks, };
548 error = gfs2_quota_lock_check(dip, &ap);
550 goto fail_quota_locks;
552 error = gfs2_inplace_reserve(dip, &ap);
554 goto fail_quota_locks;
556 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, da, 2), 0);
560 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
562 goto fail_quota_locks;
565 error = gfs2_dir_add(&dip->i_inode, name, ip, da);
569 gfs2_inplace_release(dip);
571 gfs2_quota_unlock(dip);
575 static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
578 const struct xattr *xattr;
581 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
582 err = __gfs2_xattr_set(inode, xattr->name, xattr->value,
584 GFS2_EATYPE_SECURITY);
592 * gfs2_create_inode - Create a new inode
593 * @dir: The parent directory
594 * @dentry: The new dentry
595 * @file: If non-NULL, the file which is being opened
596 * @mode: The permissions on the new inode
597 * @dev: For device nodes, this is the device number
598 * @symname: For symlinks, this is the link destination
599 * @size: The initial size of the inode (ignored for directories)
600 * @excl: Force fail if inode exists
602 * Returns: 0 on success, or error code
605 static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
607 umode_t mode, dev_t dev, const char *symname,
608 unsigned int size, int excl)
610 const struct qstr *name = &dentry->d_name;
611 struct posix_acl *default_acl, *acl;
612 struct gfs2_holder ghs[2];
613 struct inode *inode = NULL;
614 struct gfs2_inode *dip = GFS2_I(dir), *ip;
615 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
616 struct gfs2_glock *io_gl;
617 int error, free_vfs_inode = 1;
620 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
622 if (!name->len || name->len > GFS2_FNAMESIZE)
623 return -ENAMETOOLONG;
625 error = gfs2_qa_get(dip);
629 error = gfs2_rindex_update(sdp);
633 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
636 gfs2_holder_mark_uninitialized(ghs + 1);
638 error = create_ok(dip, name, mode);
642 inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl);
643 error = PTR_ERR(inode);
644 if (!IS_ERR(inode)) {
645 if (S_ISDIR(inode->i_mode)) {
647 inode = ERR_PTR(-EISDIR);
650 d_instantiate(dentry, inode);
653 if (S_ISREG(inode->i_mode))
654 error = finish_open(file, dentry, gfs2_open_common);
656 error = finish_no_open(file, NULL);
658 gfs2_glock_dq_uninit(ghs);
660 } else if (error != -ENOENT) {
664 error = gfs2_diradd_alloc_required(dir, name, &da);
668 inode = new_inode(sdp->sd_vfs);
673 error = posix_acl_create(dir, &mode, &default_acl, &acl);
678 error = gfs2_qa_get(ip);
682 inode->i_mode = mode;
683 set_nlink(inode, S_ISDIR(mode) ? 2 : 1);
685 inode->i_size = size;
686 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
687 munge_mode_uid_gid(dip, inode);
688 check_and_update_goal(dip);
689 ip->i_goal = dip->i_goal;
695 ip->i_no_addr = 0; /* Temporarily zero until real addr is assigned */
697 switch(mode & S_IFMT) {
699 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) ||
700 gfs2_tune_get(sdp, gt_new_files_jdata))
701 ip->i_diskflags |= GFS2_DIF_JDATA;
702 gfs2_set_aops(inode);
705 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA);
706 ip->i_diskflags |= GFS2_DIF_JDATA;
711 /* Force SYSTEM flag on all files and subdirs of a SYSTEM directory */
712 if (dip->i_diskflags & GFS2_DIF_SYSTEM)
713 ip->i_diskflags |= GFS2_DIF_SYSTEM;
715 gfs2_set_inode_flags(inode);
717 if ((GFS2_I(d_inode(sdp->sd_root_dir)) == dip) ||
718 (dip->i_diskflags & GFS2_DIF_TOPDIR))
719 aflags |= GFS2_AF_ORLOV;
721 if (default_acl || acl)
724 error = alloc_dinode(ip, aflags, &blocks);
726 goto fail_free_inode;
728 gfs2_set_inode_blocks(inode, blocks);
730 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
732 goto fail_free_inode;
733 flush_delayed_work(&ip->i_gl->gl_work);
735 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
737 goto fail_free_inode;
738 gfs2_cancel_delete_work(io_gl);
740 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
744 glock_set_object(ip->i_gl, ip);
745 error = gfs2_trans_begin(sdp, blocks, 0);
750 ip->i_eattr = ip->i_no_addr + 1;
753 init_dinode(dip, ip, symname);
756 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
760 glock_set_object(io_gl, ip);
762 insert_inode_hash(inode);
764 free_vfs_inode = 0; /* After this point, the inode is no longer
765 considered free. Any failures need to undo
766 the gfs2 structures. */
768 error = __gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
771 posix_acl_release(default_acl);
775 error = __gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS);
778 posix_acl_release(acl);
782 error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name,
783 &gfs2_initxattrs, NULL);
787 error = link_dinode(dip, name, ip, &da);
791 mark_inode_dirty(inode);
792 d_instantiate(dentry, inode);
793 /* After instantiate, errors should result in evict which will destroy
794 * both inode and iopen glocks properly. */
796 file->f_mode |= FMODE_CREATED;
797 error = finish_open(file, dentry, gfs2_open_common);
799 gfs2_glock_dq_uninit(ghs);
801 gfs2_glock_dq_uninit(ghs + 1);
802 gfs2_glock_put(io_gl);
807 glock_clear_object(io_gl, ip);
808 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
810 glock_clear_object(io_gl, ip);
811 gfs2_glock_put(io_gl);
814 glock_clear_object(ip->i_gl, ip);
815 if (free_vfs_inode) /* else evict will do the put for us */
816 gfs2_glock_put(ip->i_gl);
818 gfs2_rs_delete(ip, NULL);
821 posix_acl_release(default_acl);
822 posix_acl_release(acl);
824 gfs2_dir_no_add(&da);
825 gfs2_glock_dq_uninit(ghs);
826 if (!IS_ERR_OR_NULL(inode)) {
829 mark_inode_dirty(inode);
830 set_bit(free_vfs_inode ? GIF_FREE_VFS_INODE : GIF_ALLOC_FAILED,
831 &GFS2_I(inode)->i_flags);
834 if (gfs2_holder_initialized(ghs + 1))
835 gfs2_glock_dq_uninit(ghs + 1);
842 * gfs2_create - Create a file
843 * @mnt_userns: User namespace of the mount the inode was found from
844 * @dir: The directory in which to create the file
845 * @dentry: The dentry of the new file
846 * @mode: The mode of the new file
847 * @excl: Force fail if inode exists
852 static int gfs2_create(struct user_namespace *mnt_userns, struct inode *dir,
853 struct dentry *dentry, umode_t mode, bool excl)
855 return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl);
859 * __gfs2_lookup - Look up a filename in a directory and return its inode
860 * @dir: The directory inode
861 * @dentry: The dentry of the new inode
862 * @file: File to be opened
868 static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry,
873 struct gfs2_holder gh;
874 struct gfs2_glock *gl;
877 inode = gfs2_lookupi(dir, &dentry->d_name, 0);
883 return ERR_CAST(inode);
885 gl = GFS2_I(inode)->i_gl;
886 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
889 return ERR_PTR(error);
892 d = d_splice_alias(inode, dentry);
894 gfs2_glock_dq_uninit(&gh);
897 if (file && S_ISREG(inode->i_mode))
898 error = finish_open(file, dentry, gfs2_open_common);
900 gfs2_glock_dq_uninit(&gh);
903 return ERR_PTR(error);
908 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
911 return __gfs2_lookup(dir, dentry, NULL);
915 * gfs2_link - Link to a file
916 * @old_dentry: The inode to link
917 * @dir: Add link to this directory
918 * @dentry: The name of the link
920 * Link the inode in "old_dentry" into the directory "dir" with the
926 static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
927 struct dentry *dentry)
929 struct gfs2_inode *dip = GFS2_I(dir);
930 struct gfs2_sbd *sdp = GFS2_SB(dir);
931 struct inode *inode = d_inode(old_dentry);
932 struct gfs2_inode *ip = GFS2_I(inode);
933 struct gfs2_holder ghs[2];
934 struct buffer_head *dibh;
935 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
938 if (S_ISDIR(inode->i_mode))
941 error = gfs2_qa_get(dip);
945 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
946 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
948 error = gfs2_glock_nq(ghs); /* parent */
952 error = gfs2_glock_nq(ghs + 1); /* child */
957 if (inode->i_nlink == 0)
960 error = gfs2_permission(&init_user_ns, dir, MAY_WRITE | MAY_EXEC);
964 error = gfs2_dir_check(dir, &dentry->d_name, NULL);
976 if (!dip->i_inode.i_nlink)
979 if (dip->i_entries == (u32)-1)
982 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
985 if (!ip->i_inode.i_nlink)
988 if (ip->i_inode.i_nlink == (u32)-1)
991 error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da);
996 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
997 error = gfs2_quota_lock_check(dip, &ap);
1001 error = gfs2_inplace_reserve(dip, &ap);
1005 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0);
1009 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
1014 error = gfs2_meta_inode_buffer(ip, &dibh);
1018 error = gfs2_dir_add(dir, &dentry->d_name, ip, &da);
1022 gfs2_trans_add_meta(ip->i_gl, dibh);
1023 inc_nlink(&ip->i_inode);
1024 ip->i_inode.i_ctime = current_time(&ip->i_inode);
1026 d_instantiate(dentry, inode);
1027 mark_inode_dirty(inode);
1032 gfs2_trans_end(sdp);
1035 gfs2_inplace_release(dip);
1038 gfs2_quota_unlock(dip);
1040 gfs2_dir_no_add(&da);
1041 gfs2_glock_dq(ghs + 1);
1046 gfs2_holder_uninit(ghs);
1047 gfs2_holder_uninit(ghs + 1);
1052 * gfs2_unlink_ok - check to see that a inode is still in a directory
1053 * @dip: the directory
1054 * @name: the name of the file
1057 * Assumes that the lock on (at least) @dip is held.
1059 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
1062 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
1063 const struct gfs2_inode *ip)
1067 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
1070 if ((dip->i_inode.i_mode & S_ISVTX) &&
1071 !uid_eq(dip->i_inode.i_uid, current_fsuid()) &&
1072 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER))
1075 if (IS_APPEND(&dip->i_inode))
1078 error = gfs2_permission(&init_user_ns, &dip->i_inode,
1079 MAY_WRITE | MAY_EXEC);
1083 return gfs2_dir_check(&dip->i_inode, name, ip);
1087 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it
1088 * @dip: The parent directory
1089 * @dentry: The dentry to unlink
1091 * Called with all the locks and in a transaction. This will only be
1092 * called for a directory after it has been checked to ensure it is empty.
1094 * Returns: 0 on success, or an error
1097 static int gfs2_unlink_inode(struct gfs2_inode *dip,
1098 const struct dentry *dentry)
1100 struct inode *inode = d_inode(dentry);
1101 struct gfs2_inode *ip = GFS2_I(inode);
1104 error = gfs2_dir_del(dip, dentry);
1109 inode->i_ctime = current_time(inode);
1110 if (S_ISDIR(inode->i_mode))
1114 mark_inode_dirty(inode);
1115 if (inode->i_nlink == 0)
1116 gfs2_unlink_di(inode);
1122 * gfs2_unlink - Unlink an inode (this does rmdir as well)
1123 * @dir: The inode of the directory containing the inode to unlink
1124 * @dentry: The file itself
1126 * This routine uses the type of the inode as a flag to figure out
1127 * whether this is an unlink or an rmdir.
1132 static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
1134 struct gfs2_inode *dip = GFS2_I(dir);
1135 struct gfs2_sbd *sdp = GFS2_SB(dir);
1136 struct inode *inode = d_inode(dentry);
1137 struct gfs2_inode *ip = GFS2_I(inode);
1138 struct gfs2_holder ghs[3];
1139 struct gfs2_rgrpd *rgd;
1142 error = gfs2_rindex_update(sdp);
1148 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1149 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
1151 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1155 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, LM_FLAG_NODE_SCOPE, ghs + 2);
1158 error = gfs2_glock_nq(ghs); /* parent */
1162 error = gfs2_glock_nq(ghs + 1); /* child */
1167 if (inode->i_nlink == 0)
1170 if (S_ISDIR(inode->i_mode)) {
1172 if (ip->i_entries > 2 || inode->i_nlink > 2)
1176 error = gfs2_glock_nq(ghs + 2); /* rgrp */
1180 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
1184 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0);
1188 error = gfs2_unlink_inode(dip, dentry);
1189 gfs2_trans_end(sdp);
1192 gfs2_glock_dq(ghs + 2);
1194 gfs2_glock_dq(ghs + 1);
1198 gfs2_holder_uninit(ghs + 2);
1200 gfs2_holder_uninit(ghs + 1);
1201 gfs2_holder_uninit(ghs);
1206 * gfs2_symlink - Create a symlink
1207 * @mnt_userns: User namespace of the mount the inode was found from
1208 * @dir: The directory to create the symlink in
1209 * @dentry: The dentry to put the symlink in
1210 * @symname: The thing which the link points to
1215 static int gfs2_symlink(struct user_namespace *mnt_userns, struct inode *dir,
1216 struct dentry *dentry, const char *symname)
1220 size = strlen(symname);
1221 if (size >= gfs2_max_stuffed_size(GFS2_I(dir)))
1222 return -ENAMETOOLONG;
1224 return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0);
1228 * gfs2_mkdir - Make a directory
1229 * @mnt_userns: User namespace of the mount the inode was found from
1230 * @dir: The parent directory of the new one
1231 * @dentry: The dentry of the new directory
1232 * @mode: The mode of the new directory
1237 static int gfs2_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
1238 struct dentry *dentry, umode_t mode)
1240 unsigned dsize = gfs2_max_stuffed_size(GFS2_I(dir));
1241 return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0);
1245 * gfs2_mknod - Make a special file
1246 * @mnt_userns: User namespace of the mount the inode was found from
1247 * @dir: The directory in which the special file will reside
1248 * @dentry: The dentry of the special file
1249 * @mode: The mode of the special file
1250 * @dev: The device specification of the special file
1254 static int gfs2_mknod(struct user_namespace *mnt_userns, struct inode *dir,
1255 struct dentry *dentry, umode_t mode, dev_t dev)
1257 return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0);
1261 * gfs2_atomic_open - Atomically open a file
1262 * @dir: The directory
1263 * @dentry: The proposed new entry
1264 * @file: The proposed new struct file
1265 * @flags: open flags
1268 * Returns: error code or 0 for success
1271 static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry,
1272 struct file *file, unsigned flags,
1276 bool excl = !!(flags & O_EXCL);
1278 if (!d_in_lookup(dentry))
1281 d = __gfs2_lookup(dir, dentry, file);
1286 if (d_really_is_positive(dentry)) {
1287 if (!(file->f_mode & FMODE_OPENED))
1288 return finish_no_open(file, d);
1290 return excl && (flags & O_CREAT) ? -EEXIST : 0;
1296 if (!(flags & O_CREAT))
1299 return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl);
1303 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1307 * Follow @to back to the root and make sure we don't encounter @this
1308 * Assumes we already hold the rename lock.
1313 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1315 struct inode *dir = &to->i_inode;
1316 struct super_block *sb = dir->i_sb;
1323 if (dir == &this->i_inode) {
1327 if (dir == d_inode(sb->s_root)) {
1332 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
1338 error = PTR_ERR(tmp);
1352 * update_moved_ino - Update an inode that's being moved
1353 * @ip: The inode being moved
1354 * @ndip: The parent directory of the new filename
1355 * @dir_rename: True of ip is a directory
1360 static int update_moved_ino(struct gfs2_inode *ip, struct gfs2_inode *ndip,
1364 return gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);
1366 ip->i_inode.i_ctime = current_time(&ip->i_inode);
1367 mark_inode_dirty_sync(&ip->i_inode);
1373 * gfs2_rename - Rename a file
1374 * @odir: Parent directory of old file name
1375 * @odentry: The old dentry of the file
1376 * @ndir: Parent directory of new file name
1377 * @ndentry: The new dentry of the file
1382 static int gfs2_rename(struct inode *odir, struct dentry *odentry,
1383 struct inode *ndir, struct dentry *ndentry)
1385 struct gfs2_inode *odip = GFS2_I(odir);
1386 struct gfs2_inode *ndip = GFS2_I(ndir);
1387 struct gfs2_inode *ip = GFS2_I(d_inode(odentry));
1388 struct gfs2_inode *nip = NULL;
1389 struct gfs2_sbd *sdp = GFS2_SB(odir);
1390 struct gfs2_holder ghs[4], r_gh, rd_gh;
1391 struct gfs2_rgrpd *nrgd;
1392 unsigned int num_gh;
1394 struct gfs2_diradd da = { .nr_blocks = 0, .save_loc = 0, };
1398 gfs2_holder_mark_uninitialized(&r_gh);
1399 gfs2_holder_mark_uninitialized(&rd_gh);
1400 if (d_really_is_positive(ndentry)) {
1401 nip = GFS2_I(d_inode(ndentry));
1406 error = gfs2_rindex_update(sdp);
1410 error = gfs2_qa_get(ndip);
1415 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1420 if (S_ISDIR(ip->i_inode.i_mode)) {
1422 /* don't move a directory into its subdir */
1423 error = gfs2_ok_to_move(ip, ndip);
1430 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs);
1432 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE,GL_ASYNC,
1436 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh);
1440 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC,
1445 for (x = 0; x < num_gh; x++) {
1446 error = gfs2_glock_nq(ghs + x);
1450 error = gfs2_glock_async_wait(num_gh, ghs);
1455 /* Grab the resource group glock for unlink flag twiddling.
1456 * This is the case where the target dinode already exists
1457 * so we unlink before doing the rename.
1459 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1);
1464 error = gfs2_glock_nq_init(nrgd->rd_gl, LM_ST_EXCLUSIVE,
1465 LM_FLAG_NODE_SCOPE, &rd_gh);
1471 if (ip->i_inode.i_nlink == 0)
1474 /* Check out the old directory */
1476 error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
1480 /* Check out the new directory */
1483 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1487 if (nip->i_inode.i_nlink == 0) {
1492 if (S_ISDIR(nip->i_inode.i_mode)) {
1493 if (nip->i_entries < 2) {
1494 gfs2_consist_inode(nip);
1498 if (nip->i_entries > 2) {
1504 error = gfs2_permission(&init_user_ns, ndir,
1505 MAY_WRITE | MAY_EXEC);
1509 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
1522 if (!ndip->i_inode.i_nlink) {
1526 if (ndip->i_entries == (u32)-1) {
1530 if (S_ISDIR(ip->i_inode.i_mode) &&
1531 ndip->i_inode.i_nlink == (u32)-1) {
1538 /* Check out the dir to be renamed */
1541 error = gfs2_permission(&init_user_ns, d_inode(odentry),
1548 error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da);
1554 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
1555 error = gfs2_quota_lock_check(ndip, &ap);
1559 error = gfs2_inplace_reserve(ndip, &ap);
1563 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) +
1564 4 * RES_LEAF + 4, 0);
1568 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
1569 5 * RES_LEAF + 4, 0);
1574 /* Remove the target file, if it exists */
1577 error = gfs2_unlink_inode(ndip, ndentry);
1579 error = update_moved_ino(ip, ndip, dir_rename);
1583 error = gfs2_dir_del(odip, odentry);
1587 error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da);
1592 gfs2_trans_end(sdp);
1595 gfs2_inplace_release(ndip);
1598 gfs2_quota_unlock(ndip);
1600 gfs2_dir_no_add(&da);
1601 if (gfs2_holder_initialized(&rd_gh))
1602 gfs2_glock_dq_uninit(&rd_gh);
1605 if (gfs2_holder_queued(ghs + x))
1606 gfs2_glock_dq(ghs + x);
1607 gfs2_holder_uninit(ghs + x);
1610 if (gfs2_holder_initialized(&r_gh))
1611 gfs2_glock_dq_uninit(&r_gh);
1618 * gfs2_exchange - exchange two files
1619 * @odir: Parent directory of old file name
1620 * @odentry: The old dentry of the file
1621 * @ndir: Parent directory of new file name
1622 * @ndentry: The new dentry of the file
1623 * @flags: The rename flags
1628 static int gfs2_exchange(struct inode *odir, struct dentry *odentry,
1629 struct inode *ndir, struct dentry *ndentry,
1632 struct gfs2_inode *odip = GFS2_I(odir);
1633 struct gfs2_inode *ndip = GFS2_I(ndir);
1634 struct gfs2_inode *oip = GFS2_I(odentry->d_inode);
1635 struct gfs2_inode *nip = GFS2_I(ndentry->d_inode);
1636 struct gfs2_sbd *sdp = GFS2_SB(odir);
1637 struct gfs2_holder ghs[4], r_gh;
1638 unsigned int num_gh;
1640 umode_t old_mode = oip->i_inode.i_mode;
1641 umode_t new_mode = nip->i_inode.i_mode;
1644 gfs2_holder_mark_uninitialized(&r_gh);
1645 error = gfs2_rindex_update(sdp);
1650 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1655 if (S_ISDIR(old_mode)) {
1656 /* don't move a directory into its subdir */
1657 error = gfs2_ok_to_move(oip, ndip);
1662 if (S_ISDIR(new_mode)) {
1663 /* don't move a directory into its subdir */
1664 error = gfs2_ok_to_move(nip, odip);
1671 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs);
1673 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC,
1677 gfs2_holder_init(oip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh);
1680 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh);
1683 for (x = 0; x < num_gh; x++) {
1684 error = gfs2_glock_nq(ghs + x);
1689 error = gfs2_glock_async_wait(num_gh, ghs);
1694 if (oip->i_inode.i_nlink == 0 || nip->i_inode.i_nlink == 0)
1697 error = gfs2_unlink_ok(odip, &odentry->d_name, oip);
1700 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1704 if (S_ISDIR(old_mode)) {
1705 error = gfs2_permission(&init_user_ns, odentry->d_inode,
1710 if (S_ISDIR(new_mode)) {
1711 error = gfs2_permission(&init_user_ns, ndentry->d_inode,
1716 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 4 * RES_LEAF, 0);
1720 error = update_moved_ino(oip, ndip, S_ISDIR(old_mode));
1724 error = update_moved_ino(nip, odip, S_ISDIR(new_mode));
1728 error = gfs2_dir_mvino(ndip, &ndentry->d_name, oip,
1733 error = gfs2_dir_mvino(odip, &odentry->d_name, nip,
1739 if (S_ISDIR(new_mode) && !S_ISDIR(old_mode)) {
1740 inc_nlink(&odip->i_inode);
1741 drop_nlink(&ndip->i_inode);
1742 } else if (S_ISDIR(old_mode) && !S_ISDIR(new_mode)) {
1743 inc_nlink(&ndip->i_inode);
1744 drop_nlink(&odip->i_inode);
1747 mark_inode_dirty(&ndip->i_inode);
1749 mark_inode_dirty(&odip->i_inode);
1752 gfs2_trans_end(sdp);
1755 if (gfs2_holder_queued(ghs + x))
1756 gfs2_glock_dq(ghs + x);
1757 gfs2_holder_uninit(ghs + x);
1760 if (gfs2_holder_initialized(&r_gh))
1761 gfs2_glock_dq_uninit(&r_gh);
1766 static int gfs2_rename2(struct user_namespace *mnt_userns, struct inode *odir,
1767 struct dentry *odentry, struct inode *ndir,
1768 struct dentry *ndentry, unsigned int flags)
1770 flags &= ~RENAME_NOREPLACE;
1772 if (flags & ~RENAME_EXCHANGE)
1775 if (flags & RENAME_EXCHANGE)
1776 return gfs2_exchange(odir, odentry, ndir, ndentry, flags);
1778 return gfs2_rename(odir, odentry, ndir, ndentry);
1782 * gfs2_get_link - Follow a symbolic link
1783 * @dentry: The dentry of the link
1784 * @inode: The inode of the link
1785 * @done: destructor for return value
1787 * This can handle symlinks of any size.
1789 * Returns: 0 on success or error code
1792 static const char *gfs2_get_link(struct dentry *dentry,
1793 struct inode *inode,
1794 struct delayed_call *done)
1796 struct gfs2_inode *ip = GFS2_I(inode);
1797 struct gfs2_holder i_gh;
1798 struct buffer_head *dibh;
1804 return ERR_PTR(-ECHILD);
1806 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1807 error = gfs2_glock_nq(&i_gh);
1809 gfs2_holder_uninit(&i_gh);
1810 return ERR_PTR(error);
1813 size = (unsigned int)i_size_read(&ip->i_inode);
1815 gfs2_consist_inode(ip);
1816 buf = ERR_PTR(-EIO);
1820 error = gfs2_meta_inode_buffer(ip, &dibh);
1822 buf = ERR_PTR(error);
1826 buf = kzalloc(size + 1, GFP_NOFS);
1828 buf = ERR_PTR(-ENOMEM);
1830 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
1833 gfs2_glock_dq_uninit(&i_gh);
1835 set_delayed_call(done, kfree_link, buf);
1841 * @mnt_userns: User namespace of the mount the inode was found from
1843 * @mask: The mask to be tested
1845 * This may be called from the VFS directly, or from within GFS2 with the
1846 * inode locked, so we look to see if the glock is already locked and only
1847 * lock the glock if its not already been done.
1852 int gfs2_permission(struct user_namespace *mnt_userns, struct inode *inode,
1855 struct gfs2_inode *ip;
1856 struct gfs2_holder i_gh;
1859 gfs2_holder_mark_uninitialized(&i_gh);
1861 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1862 if (mask & MAY_NOT_BLOCK)
1864 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1869 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1872 error = generic_permission(&init_user_ns, inode, mask);
1873 if (gfs2_holder_initialized(&i_gh))
1874 gfs2_glock_dq_uninit(&i_gh);
1879 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1881 setattr_copy(&init_user_ns, inode, attr);
1882 mark_inode_dirty(inode);
1886 static int gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1890 if (current->journal_info)
1891 return __gfs2_setattr_simple(inode, attr);
1893 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0);
1897 error = __gfs2_setattr_simple(inode, attr);
1898 gfs2_trans_end(GFS2_SB(inode));
1902 static int setattr_chown(struct inode *inode, struct iattr *attr)
1904 struct gfs2_inode *ip = GFS2_I(inode);
1905 struct gfs2_sbd *sdp = GFS2_SB(inode);
1909 struct gfs2_alloc_parms ap;
1911 ouid = inode->i_uid;
1912 ogid = inode->i_gid;
1913 nuid = attr->ia_uid;
1914 ngid = attr->ia_gid;
1916 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid))
1917 ouid = nuid = NO_UID_QUOTA_CHANGE;
1918 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid))
1919 ogid = ngid = NO_GID_QUOTA_CHANGE;
1920 error = gfs2_qa_get(ip);
1924 error = gfs2_rindex_update(sdp);
1928 error = gfs2_quota_lock(ip, nuid, ngid);
1932 ap.target = gfs2_get_inode_blocks(&ip->i_inode);
1934 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1935 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1936 error = gfs2_quota_check(ip, nuid, ngid, &ap);
1941 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1945 error = gfs2_setattr_simple(inode, attr);
1949 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1950 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1951 gfs2_quota_change(ip, -(s64)ap.target, ouid, ogid);
1952 gfs2_quota_change(ip, ap.target, nuid, ngid);
1956 gfs2_trans_end(sdp);
1958 gfs2_quota_unlock(ip);
1965 * gfs2_setattr - Change attributes on an inode
1966 * @mnt_userns: User namespace of the mount the inode was found from
1967 * @dentry: The dentry which is changing
1968 * @attr: The structure describing the change
1970 * The VFS layer wants to change one or more of an inodes attributes. Write
1971 * that change out to disk.
1976 static int gfs2_setattr(struct user_namespace *mnt_userns,
1977 struct dentry *dentry, struct iattr *attr)
1979 struct inode *inode = d_inode(dentry);
1980 struct gfs2_inode *ip = GFS2_I(inode);
1981 struct gfs2_holder i_gh;
1984 error = gfs2_qa_get(ip);
1988 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1992 error = may_setattr(&init_user_ns, inode, attr->ia_valid);
1996 error = setattr_prepare(&init_user_ns, dentry, attr);
2000 if (attr->ia_valid & ATTR_SIZE)
2001 error = gfs2_setattr_size(inode, attr->ia_size);
2002 else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
2003 error = setattr_chown(inode, attr);
2005 error = gfs2_setattr_simple(inode, attr);
2006 if (!error && attr->ia_valid & ATTR_MODE)
2007 error = posix_acl_chmod(&init_user_ns, inode,
2013 mark_inode_dirty(inode);
2014 gfs2_glock_dq_uninit(&i_gh);
2021 * gfs2_getattr - Read out an inode's attributes
2022 * @mnt_userns: user namespace of the mount the inode was found from
2023 * @path: Object to query
2024 * @stat: The inode's stats
2025 * @request_mask: Mask of STATX_xxx flags indicating the caller's interests
2026 * @flags: AT_STATX_xxx setting
2028 * This may be called from the VFS directly, or from within GFS2 with the
2029 * inode locked, so we look to see if the glock is already locked and only
2030 * lock the glock if its not already been done. Note that its the NFS
2031 * readdirplus operation which causes this to be called (from filldir)
2032 * with the glock already held.
2037 static int gfs2_getattr(struct user_namespace *mnt_userns,
2038 const struct path *path, struct kstat *stat,
2039 u32 request_mask, unsigned int flags)
2041 struct inode *inode = d_inode(path->dentry);
2042 struct gfs2_inode *ip = GFS2_I(inode);
2043 struct gfs2_holder gh;
2047 gfs2_holder_mark_uninitialized(&gh);
2048 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
2049 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
2054 gfsflags = ip->i_diskflags;
2055 if (gfsflags & GFS2_DIF_APPENDONLY)
2056 stat->attributes |= STATX_ATTR_APPEND;
2057 if (gfsflags & GFS2_DIF_IMMUTABLE)
2058 stat->attributes |= STATX_ATTR_IMMUTABLE;
2060 stat->attributes_mask |= (STATX_ATTR_APPEND |
2061 STATX_ATTR_COMPRESSED |
2062 STATX_ATTR_ENCRYPTED |
2063 STATX_ATTR_IMMUTABLE |
2066 generic_fillattr(&init_user_ns, inode, stat);
2068 if (gfs2_holder_initialized(&gh))
2069 gfs2_glock_dq_uninit(&gh);
2074 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
2077 struct gfs2_inode *ip = GFS2_I(inode);
2078 struct gfs2_holder gh;
2081 inode_lock_shared(inode);
2083 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2087 ret = iomap_fiemap(inode, fieinfo, start, len, &gfs2_iomap_ops);
2089 gfs2_glock_dq_uninit(&gh);
2092 inode_unlock_shared(inode);
2096 loff_t gfs2_seek_data(struct file *file, loff_t offset)
2098 struct inode *inode = file->f_mapping->host;
2099 struct gfs2_inode *ip = GFS2_I(inode);
2100 struct gfs2_holder gh;
2103 inode_lock_shared(inode);
2104 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2106 ret = iomap_seek_data(inode, offset, &gfs2_iomap_ops);
2107 gfs2_glock_dq_uninit(&gh);
2108 inode_unlock_shared(inode);
2112 return vfs_setpos(file, ret, inode->i_sb->s_maxbytes);
2115 loff_t gfs2_seek_hole(struct file *file, loff_t offset)
2117 struct inode *inode = file->f_mapping->host;
2118 struct gfs2_inode *ip = GFS2_I(inode);
2119 struct gfs2_holder gh;
2122 inode_lock_shared(inode);
2123 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2125 ret = iomap_seek_hole(inode, offset, &gfs2_iomap_ops);
2126 gfs2_glock_dq_uninit(&gh);
2127 inode_unlock_shared(inode);
2131 return vfs_setpos(file, ret, inode->i_sb->s_maxbytes);
2134 static int gfs2_update_time(struct inode *inode, struct timespec64 *time,
2137 struct gfs2_inode *ip = GFS2_I(inode);
2138 struct gfs2_glock *gl = ip->i_gl;
2139 struct gfs2_holder *gh;
2142 gh = gfs2_glock_is_locked_by_me(gl);
2143 if (gh && !gfs2_glock_is_held_excl(gl)) {
2145 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, gh);
2146 error = gfs2_glock_nq(gh);
2150 return generic_update_time(inode, time, flags);
2153 static const struct inode_operations gfs2_file_iops = {
2154 .permission = gfs2_permission,
2155 .setattr = gfs2_setattr,
2156 .getattr = gfs2_getattr,
2157 .listxattr = gfs2_listxattr,
2158 .fiemap = gfs2_fiemap,
2159 .get_acl = gfs2_get_acl,
2160 .set_acl = gfs2_set_acl,
2161 .update_time = gfs2_update_time,
2162 .fileattr_get = gfs2_fileattr_get,
2163 .fileattr_set = gfs2_fileattr_set,
2166 static const struct inode_operations gfs2_dir_iops = {
2167 .create = gfs2_create,
2168 .lookup = gfs2_lookup,
2170 .unlink = gfs2_unlink,
2171 .symlink = gfs2_symlink,
2172 .mkdir = gfs2_mkdir,
2173 .rmdir = gfs2_unlink,
2174 .mknod = gfs2_mknod,
2175 .rename = gfs2_rename2,
2176 .permission = gfs2_permission,
2177 .setattr = gfs2_setattr,
2178 .getattr = gfs2_getattr,
2179 .listxattr = gfs2_listxattr,
2180 .fiemap = gfs2_fiemap,
2181 .get_acl = gfs2_get_acl,
2182 .set_acl = gfs2_set_acl,
2183 .update_time = gfs2_update_time,
2184 .atomic_open = gfs2_atomic_open,
2185 .fileattr_get = gfs2_fileattr_get,
2186 .fileattr_set = gfs2_fileattr_set,
2189 static const struct inode_operations gfs2_symlink_iops = {
2190 .get_link = gfs2_get_link,
2191 .permission = gfs2_permission,
2192 .setattr = gfs2_setattr,
2193 .getattr = gfs2_getattr,
2194 .listxattr = gfs2_listxattr,
2195 .fiemap = gfs2_fiemap,