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 int iget_test(struct inode *inode, void *opaque)
41 u64 no_addr = *(u64 *)opaque;
43 return GFS2_I(inode)->i_no_addr == no_addr;
46 static int iget_set(struct inode *inode, void *opaque)
48 u64 no_addr = *(u64 *)opaque;
50 GFS2_I(inode)->i_no_addr = no_addr;
51 inode->i_ino = no_addr;
55 static struct inode *gfs2_iget(struct super_block *sb, u64 no_addr)
60 inode = iget5_locked(sb, no_addr, iget_test, iget_set, &no_addr);
63 if (is_bad_inode(inode)) {
71 * gfs2_set_iop - Sets inode operations
72 * @inode: The inode with correct i_mode filled in
74 * GFS2 lookup code fills in vfs inode contents based on info obtained
75 * from directory entry inside gfs2_inode_lookup().
78 static void gfs2_set_iop(struct inode *inode)
80 struct gfs2_sbd *sdp = GFS2_SB(inode);
81 umode_t mode = inode->i_mode;
84 inode->i_op = &gfs2_file_iops;
85 if (gfs2_localflocks(sdp))
86 inode->i_fop = &gfs2_file_fops_nolock;
88 inode->i_fop = &gfs2_file_fops;
89 } else if (S_ISDIR(mode)) {
90 inode->i_op = &gfs2_dir_iops;
91 if (gfs2_localflocks(sdp))
92 inode->i_fop = &gfs2_dir_fops_nolock;
94 inode->i_fop = &gfs2_dir_fops;
95 } else if (S_ISLNK(mode)) {
96 inode->i_op = &gfs2_symlink_iops;
98 inode->i_op = &gfs2_file_iops;
99 init_special_inode(inode, inode->i_mode, inode->i_rdev);
104 * gfs2_inode_lookup - Lookup an inode
105 * @sb: The super block
106 * @type: The type of the inode
107 * @no_addr: The inode number
108 * @no_formal_ino: The inode generation number
109 * @blktype: Requested block type (GFS2_BLKST_DINODE or GFS2_BLKST_UNLINKED;
110 * GFS2_BLKST_FREE to indicate not to verify)
112 * If @type is DT_UNKNOWN, the inode type is fetched from disk.
114 * If @blktype is anything other than GFS2_BLKST_FREE (which is used as a
115 * placeholder because it doesn't otherwise make sense), the on-disk block type
116 * is verified to be @blktype.
118 * When @no_formal_ino is non-zero, this function will return ERR_PTR(-ESTALE)
119 * if it detects that @no_formal_ino doesn't match the actual inode generation
120 * number. However, it doesn't always know unless @type is DT_UNKNOWN.
122 * Returns: A VFS inode, or an error
125 struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type,
126 u64 no_addr, u64 no_formal_ino,
127 unsigned int blktype)
130 struct gfs2_inode *ip;
131 struct gfs2_glock *io_gl = NULL;
132 struct gfs2_holder i_gh;
135 gfs2_holder_mark_uninitialized(&i_gh);
136 inode = gfs2_iget(sb, no_addr);
138 return ERR_PTR(-ENOMEM);
142 if (inode->i_state & I_NEW) {
143 struct gfs2_sbd *sdp = GFS2_SB(inode);
145 error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
148 flush_delayed_work(&ip->i_gl->gl_work);
150 error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
154 if (type == DT_UNKNOWN || blktype != GFS2_BLKST_FREE) {
156 * The GL_SKIP flag indicates to skip reading the inode
157 * block. We read the inode with gfs2_inode_refresh
158 * after possibly checking the block type.
160 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE,
167 gfs2_inode_already_deleted(ip->i_gl, no_formal_ino))
170 if (blktype != GFS2_BLKST_FREE) {
171 error = gfs2_check_blk_type(sdp, no_addr,
178 glock_set_object(ip->i_gl, ip);
179 set_bit(GIF_INVALID, &ip->i_flags);
180 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
183 if (blktype != GFS2_BLKST_UNLINKED)
184 gfs2_cancel_delete_work(ip->i_iopen_gh.gh_gl);
185 glock_set_object(ip->i_iopen_gh.gh_gl, ip);
186 gfs2_glock_put(io_gl);
189 /* Lowest possible timestamp; will be overwritten in gfs2_dinode_in. */
190 inode->i_atime.tv_sec = 1LL << (8 * sizeof(inode->i_atime.tv_sec) - 1);
191 inode->i_atime.tv_nsec = 0;
193 if (type == DT_UNKNOWN) {
194 /* Inode glock must be locked already */
195 error = gfs2_inode_refresh(GFS2_I(inode));
199 ip->i_no_formal_ino = no_formal_ino;
200 inode->i_mode = DT2IF(type);
203 if (gfs2_holder_initialized(&i_gh))
204 gfs2_glock_dq_uninit(&i_gh);
209 if (no_formal_ino && ip->i_no_formal_ino &&
210 no_formal_ino != ip->i_no_formal_ino) {
212 if (inode->i_state & I_NEW)
215 return ERR_PTR(error);
218 if (inode->i_state & I_NEW)
219 unlock_new_inode(inode);
225 gfs2_glock_put(io_gl);
226 if (gfs2_holder_initialized(&i_gh))
227 gfs2_glock_dq_uninit(&i_gh);
229 return ERR_PTR(error);
233 * gfs2_lookup_by_inum - look up an inode by inode number
234 * @sdp: The super block
235 * @no_addr: The inode number
236 * @no_formal_ino: The inode generation number (0 for any)
237 * @blktype: Requested block type (see gfs2_inode_lookup)
239 struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr,
240 u64 no_formal_ino, unsigned int blktype)
242 struct super_block *sb = sdp->sd_vfs;
246 inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, no_formal_ino,
253 if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM)
260 return ERR_PTR(error);
264 struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
268 gfs2_str2qstr(&qstr, name);
269 inode = gfs2_lookupi(dip, &qstr, 1);
270 /* gfs2_lookupi has inconsistent callers: vfs
271 * related routines expect NULL for no entry found,
272 * gfs2_lookup_simple callers expect ENOENT
273 * and do not check for NULL.
276 return ERR_PTR(-ENOENT);
283 * gfs2_lookupi - Look up a filename in a directory and return its inode
284 * @d_gh: An initialized holder for the directory glock
285 * @name: The name of the inode to look for
286 * @is_root: If 1, ignore the caller's permissions
287 * @i_gh: An uninitialized holder for the new inode glock
289 * This can be called via the VFS filldir function when NFS is doing
290 * a readdirplus and the inode which its intending to stat isn't
291 * already in cache. In this case we must not take the directory glock
292 * again, since the readdir call will have already taken that lock.
297 struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
300 struct super_block *sb = dir->i_sb;
301 struct gfs2_inode *dip = GFS2_I(dir);
302 struct gfs2_holder d_gh;
304 struct inode *inode = NULL;
306 gfs2_holder_mark_uninitialized(&d_gh);
307 if (!name->len || name->len > GFS2_FNAMESIZE)
308 return ERR_PTR(-ENAMETOOLONG);
310 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
311 (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
312 dir == d_inode(sb->s_root))) {
317 if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) {
318 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
320 return ERR_PTR(error);
324 error = gfs2_permission(dir, MAY_EXEC);
329 inode = gfs2_dir_search(dir, name, false);
331 error = PTR_ERR(inode);
333 if (gfs2_holder_initialized(&d_gh))
334 gfs2_glock_dq_uninit(&d_gh);
335 if (error == -ENOENT)
337 return inode ? inode : ERR_PTR(error);
341 * create_ok - OK to create a new on-disk inode here?
342 * @dip: Directory in which dinode is to be created
343 * @name: Name of new dinode
349 static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
354 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
358 /* Don't create entries in an unlinked directory */
359 if (!dip->i_inode.i_nlink)
362 if (dip->i_entries == (u32)-1)
364 if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1)
370 static void munge_mode_uid_gid(const struct gfs2_inode *dip,
373 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
374 (dip->i_inode.i_mode & S_ISUID) &&
375 !uid_eq(dip->i_inode.i_uid, GLOBAL_ROOT_UID)) {
376 if (S_ISDIR(inode->i_mode))
377 inode->i_mode |= S_ISUID;
378 else if (!uid_eq(dip->i_inode.i_uid, current_fsuid()))
379 inode->i_mode &= ~07111;
380 inode->i_uid = dip->i_inode.i_uid;
382 inode->i_uid = current_fsuid();
384 if (dip->i_inode.i_mode & S_ISGID) {
385 if (S_ISDIR(inode->i_mode))
386 inode->i_mode |= S_ISGID;
387 inode->i_gid = dip->i_inode.i_gid;
389 inode->i_gid = current_fsgid();
392 static int alloc_dinode(struct gfs2_inode *ip, u32 flags, unsigned *dblocks)
394 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
395 struct gfs2_alloc_parms ap = { .target = *dblocks, .aflags = flags, };
398 error = gfs2_quota_lock_check(ip, &ap);
402 error = gfs2_inplace_reserve(ip, &ap);
406 error = gfs2_trans_begin(sdp, (*dblocks * RES_RG_BIT) + RES_STATFS + RES_QUOTA, 0);
410 error = gfs2_alloc_blocks(ip, &ip->i_no_addr, dblocks, 1, &ip->i_generation);
411 ip->i_no_formal_ino = ip->i_generation;
412 ip->i_inode.i_ino = ip->i_no_addr;
413 ip->i_goal = ip->i_no_addr;
418 gfs2_inplace_release(ip);
420 gfs2_quota_unlock(ip);
425 static void gfs2_init_dir(struct buffer_head *dibh,
426 const struct gfs2_inode *parent)
428 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
429 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
431 gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent);
432 dent->de_inum = di->di_num; /* already GFS2 endian */
433 dent->de_type = cpu_to_be16(DT_DIR);
435 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
436 gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
437 gfs2_inum_out(parent, dent);
438 dent->de_type = cpu_to_be16(DT_DIR);
443 * gfs2_init_xattr - Initialise an xattr block for a new inode
444 * @ip: The inode in question
446 * This sets up an empty xattr block for a new inode, ready to
447 * take any ACLs, LSM xattrs, etc.
450 static void gfs2_init_xattr(struct gfs2_inode *ip)
452 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
453 struct buffer_head *bh;
454 struct gfs2_ea_header *ea;
456 bh = gfs2_meta_new(ip->i_gl, ip->i_eattr);
457 gfs2_trans_add_meta(ip->i_gl, bh);
458 gfs2_metatype_set(bh, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
459 gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header));
461 ea = GFS2_EA_BH2FIRST(bh);
462 ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
463 ea->ea_type = GFS2_EATYPE_UNUSED;
464 ea->ea_flags = GFS2_EAFLAG_LAST;
470 * init_dinode - Fill in a new dinode structure
471 * @dip: The directory this inode is being created in
473 * @symname: The symlink destination (if a symlink)
474 * @bhp: The buffer head (returned to caller)
478 static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip,
481 struct gfs2_dinode *di;
482 struct buffer_head *dibh;
484 dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr);
485 gfs2_trans_add_meta(ip->i_gl, dibh);
486 di = (struct gfs2_dinode *)dibh->b_data;
487 gfs2_dinode_out(ip, di);
489 di->di_major = cpu_to_be32(MAJOR(ip->i_inode.i_rdev));
490 di->di_minor = cpu_to_be32(MINOR(ip->i_inode.i_rdev));
494 memset(&di->__pad4, 0, sizeof(di->__pad4));
495 memset(&di->di_reserved, 0, sizeof(di->di_reserved));
496 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
498 switch(ip->i_inode.i_mode & S_IFMT) {
500 gfs2_init_dir(dibh, dip);
503 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size);
507 set_buffer_uptodate(dibh);
512 * gfs2_trans_da_blocks - Calculate number of blocks to link inode
513 * @dip: The directory we are linking into
514 * @da: The dir add information
515 * @nr_inodes: The number of inodes involved
517 * This calculate the number of blocks we need to reserve in a
518 * transaction to link @nr_inodes into a directory. In most cases
519 * @nr_inodes will be 2 (the directory plus the inode being linked in)
520 * but in case of rename, 4 may be required.
522 * Returns: Number of blocks
525 static unsigned gfs2_trans_da_blks(const struct gfs2_inode *dip,
526 const struct gfs2_diradd *da,
529 return da->nr_blocks + gfs2_rg_blocks(dip, da->nr_blocks) +
530 (nr_inodes * RES_DINODE) + RES_QUOTA + RES_STATFS;
533 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
534 struct gfs2_inode *ip, struct gfs2_diradd *da)
536 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
537 struct gfs2_alloc_parms ap = { .target = da->nr_blocks, };
541 error = gfs2_quota_lock_check(dip, &ap);
543 goto fail_quota_locks;
545 error = gfs2_inplace_reserve(dip, &ap);
547 goto fail_quota_locks;
549 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, da, 2), 0);
553 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
555 goto fail_quota_locks;
558 error = gfs2_dir_add(&dip->i_inode, name, ip, da);
562 gfs2_inplace_release(dip);
564 gfs2_quota_unlock(dip);
568 static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
571 const struct xattr *xattr;
574 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
575 err = __gfs2_xattr_set(inode, xattr->name, xattr->value,
577 GFS2_EATYPE_SECURITY);
585 * gfs2_create_inode - Create a new inode
586 * @dir: The parent directory
587 * @dentry: The new dentry
588 * @file: If non-NULL, the file which is being opened
589 * @mode: The permissions on the new inode
590 * @dev: For device nodes, this is the device number
591 * @symname: For symlinks, this is the link destination
592 * @size: The initial size of the inode (ignored for directories)
594 * Returns: 0 on success, or error code
597 static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
599 umode_t mode, dev_t dev, const char *symname,
600 unsigned int size, int excl)
602 const struct qstr *name = &dentry->d_name;
603 struct posix_acl *default_acl, *acl;
604 struct gfs2_holder ghs[2];
605 struct inode *inode = NULL;
606 struct gfs2_inode *dip = GFS2_I(dir), *ip;
607 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
608 struct gfs2_glock *io_gl = NULL;
609 int error, free_vfs_inode = 1;
612 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
614 if (!name->len || name->len > GFS2_FNAMESIZE)
615 return -ENAMETOOLONG;
617 error = gfs2_qa_get(dip);
621 error = gfs2_rindex_update(sdp);
625 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
628 gfs2_holder_mark_uninitialized(ghs + 1);
630 error = create_ok(dip, name, mode);
634 inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl);
635 error = PTR_ERR(inode);
636 if (!IS_ERR(inode)) {
637 if (S_ISDIR(inode->i_mode)) {
639 inode = ERR_PTR(-EISDIR);
642 d_instantiate(dentry, inode);
645 if (S_ISREG(inode->i_mode))
646 error = finish_open(file, dentry, gfs2_open_common);
648 error = finish_no_open(file, NULL);
650 gfs2_glock_dq_uninit(ghs);
652 } else if (error != -ENOENT) {
656 error = gfs2_diradd_alloc_required(dir, name, &da);
660 inode = new_inode(sdp->sd_vfs);
665 error = posix_acl_create(dir, &mode, &default_acl, &acl);
670 error = gfs2_qa_get(ip);
674 inode->i_mode = mode;
675 set_nlink(inode, S_ISDIR(mode) ? 2 : 1);
677 inode->i_size = size;
678 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
679 munge_mode_uid_gid(dip, inode);
680 check_and_update_goal(dip);
681 ip->i_goal = dip->i_goal;
687 ip->i_no_addr = 0; /* Temporarily zero until real addr is assigned */
689 switch(mode & S_IFMT) {
691 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) ||
692 gfs2_tune_get(sdp, gt_new_files_jdata))
693 ip->i_diskflags |= GFS2_DIF_JDATA;
694 gfs2_set_aops(inode);
697 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA);
698 ip->i_diskflags |= GFS2_DIF_JDATA;
703 /* Force SYSTEM flag on all files and subdirs of a SYSTEM directory */
704 if (dip->i_diskflags & GFS2_DIF_SYSTEM)
705 ip->i_diskflags |= GFS2_DIF_SYSTEM;
707 gfs2_set_inode_flags(inode);
709 if ((GFS2_I(d_inode(sdp->sd_root_dir)) == dip) ||
710 (dip->i_diskflags & GFS2_DIF_TOPDIR))
711 aflags |= GFS2_AF_ORLOV;
713 if (default_acl || acl)
716 error = alloc_dinode(ip, aflags, &blocks);
718 goto fail_free_inode;
720 gfs2_set_inode_blocks(inode, blocks);
722 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
724 goto fail_free_inode;
725 flush_delayed_work(&ip->i_gl->gl_work);
726 glock_set_object(ip->i_gl, ip);
728 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
730 goto fail_free_inode;
732 error = gfs2_trans_begin(sdp, blocks, 0);
734 goto fail_free_inode;
737 ip->i_eattr = ip->i_no_addr + 1;
740 init_dinode(dip, ip, symname);
743 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
745 goto fail_free_inode;
747 BUG_ON(test_and_set_bit(GLF_INODE_CREATING, &io_gl->gl_flags));
749 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
753 gfs2_cancel_delete_work(ip->i_iopen_gh.gh_gl);
754 glock_set_object(ip->i_iopen_gh.gh_gl, ip);
756 insert_inode_hash(inode);
758 free_vfs_inode = 0; /* After this point, the inode is no longer
759 considered free. Any failures need to undo
760 the gfs2 structures. */
762 error = __gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
765 posix_acl_release(default_acl);
769 error = __gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS);
772 posix_acl_release(acl);
776 error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name,
777 &gfs2_initxattrs, NULL);
781 error = link_dinode(dip, name, ip, &da);
785 mark_inode_dirty(inode);
786 d_instantiate(dentry, inode);
787 /* After instantiate, errors should result in evict which will destroy
788 * both inode and iopen glocks properly. */
790 file->f_mode |= FMODE_CREATED;
791 error = finish_open(file, dentry, gfs2_open_common);
793 gfs2_glock_dq_uninit(ghs);
795 gfs2_glock_dq_uninit(ghs + 1);
796 clear_bit(GLF_INODE_CREATING, &io_gl->gl_flags);
797 gfs2_glock_put(io_gl);
802 glock_clear_object(io_gl, ip);
803 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
805 clear_bit(GLF_INODE_CREATING, &io_gl->gl_flags);
806 gfs2_glock_put(io_gl);
809 glock_clear_object(ip->i_gl, ip);
810 if (free_vfs_inode) /* else evict will do the put for us */
811 gfs2_glock_put(ip->i_gl);
813 gfs2_rs_delete(ip, NULL);
816 posix_acl_release(default_acl);
817 posix_acl_release(acl);
819 gfs2_dir_no_add(&da);
820 gfs2_glock_dq_uninit(ghs);
821 if (!IS_ERR_OR_NULL(inode)) {
824 mark_inode_dirty(inode);
825 set_bit(free_vfs_inode ? GIF_FREE_VFS_INODE : GIF_ALLOC_FAILED,
826 &GFS2_I(inode)->i_flags);
829 if (gfs2_holder_initialized(ghs + 1))
830 gfs2_glock_dq_uninit(ghs + 1);
837 * gfs2_create - Create a file
838 * @dir: The directory in which to create the file
839 * @dentry: The dentry of the new file
840 * @mode: The mode of the new file
845 static int gfs2_create(struct inode *dir, struct dentry *dentry,
846 umode_t mode, bool excl)
848 return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl);
852 * __gfs2_lookup - Look up a filename in a directory and return its inode
853 * @dir: The directory inode
854 * @dentry: The dentry of the new inode
855 * @file: File to be opened
861 static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry,
866 struct gfs2_holder gh;
867 struct gfs2_glock *gl;
870 inode = gfs2_lookupi(dir, &dentry->d_name, 0);
876 return ERR_CAST(inode);
878 gl = GFS2_I(inode)->i_gl;
879 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
882 return ERR_PTR(error);
885 d = d_splice_alias(inode, dentry);
887 gfs2_glock_dq_uninit(&gh);
890 if (file && S_ISREG(inode->i_mode))
891 error = finish_open(file, dentry, gfs2_open_common);
893 gfs2_glock_dq_uninit(&gh);
896 return ERR_PTR(error);
901 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
904 return __gfs2_lookup(dir, dentry, NULL);
908 * gfs2_link - Link to a file
909 * @old_dentry: The inode to link
910 * @dir: Add link to this directory
911 * @dentry: The name of the link
913 * Link the inode in "old_dentry" into the directory "dir" with the
919 static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
920 struct dentry *dentry)
922 struct gfs2_inode *dip = GFS2_I(dir);
923 struct gfs2_sbd *sdp = GFS2_SB(dir);
924 struct inode *inode = d_inode(old_dentry);
925 struct gfs2_inode *ip = GFS2_I(inode);
926 struct gfs2_holder ghs[2];
927 struct buffer_head *dibh;
928 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
931 if (S_ISDIR(inode->i_mode))
934 error = gfs2_qa_get(dip);
938 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
939 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
941 error = gfs2_glock_nq(ghs); /* parent */
945 error = gfs2_glock_nq(ghs + 1); /* child */
950 if (inode->i_nlink == 0)
953 error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC);
957 error = gfs2_dir_check(dir, &dentry->d_name, NULL);
968 if (!dip->i_inode.i_nlink)
971 if (dip->i_entries == (u32)-1)
974 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
977 if (!ip->i_inode.i_nlink)
980 if (ip->i_inode.i_nlink == (u32)-1)
983 error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da);
988 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
989 error = gfs2_quota_lock_check(dip, &ap);
993 error = gfs2_inplace_reserve(dip, &ap);
997 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0);
1001 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
1006 error = gfs2_meta_inode_buffer(ip, &dibh);
1010 error = gfs2_dir_add(dir, &dentry->d_name, ip, &da);
1014 gfs2_trans_add_meta(ip->i_gl, dibh);
1015 inc_nlink(&ip->i_inode);
1016 ip->i_inode.i_ctime = current_time(&ip->i_inode);
1018 d_instantiate(dentry, inode);
1019 mark_inode_dirty(inode);
1024 gfs2_trans_end(sdp);
1027 gfs2_inplace_release(dip);
1030 gfs2_quota_unlock(dip);
1032 gfs2_dir_no_add(&da);
1033 gfs2_glock_dq(ghs + 1);
1038 gfs2_holder_uninit(ghs);
1039 gfs2_holder_uninit(ghs + 1);
1044 * gfs2_unlink_ok - check to see that a inode is still in a directory
1045 * @dip: the directory
1046 * @name: the name of the file
1049 * Assumes that the lock on (at least) @dip is held.
1051 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
1054 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
1055 const struct gfs2_inode *ip)
1059 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
1062 if ((dip->i_inode.i_mode & S_ISVTX) &&
1063 !uid_eq(dip->i_inode.i_uid, current_fsuid()) &&
1064 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER))
1067 if (IS_APPEND(&dip->i_inode))
1070 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
1074 return gfs2_dir_check(&dip->i_inode, name, ip);
1078 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it
1079 * @dip: The parent directory
1080 * @name: The name of the entry in the parent directory
1081 * @inode: The inode to be removed
1083 * Called with all the locks and in a transaction. This will only be
1084 * called for a directory after it has been checked to ensure it is empty.
1086 * Returns: 0 on success, or an error
1089 static int gfs2_unlink_inode(struct gfs2_inode *dip,
1090 const struct dentry *dentry)
1092 struct inode *inode = d_inode(dentry);
1093 struct gfs2_inode *ip = GFS2_I(inode);
1096 error = gfs2_dir_del(dip, dentry);
1101 inode->i_ctime = current_time(inode);
1102 if (S_ISDIR(inode->i_mode))
1106 mark_inode_dirty(inode);
1107 if (inode->i_nlink == 0)
1108 gfs2_unlink_di(inode);
1114 * gfs2_unlink - Unlink an inode (this does rmdir as well)
1115 * @dir: The inode of the directory containing the inode to unlink
1116 * @dentry: The file itself
1118 * This routine uses the type of the inode as a flag to figure out
1119 * whether this is an unlink or an rmdir.
1124 static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
1126 struct gfs2_inode *dip = GFS2_I(dir);
1127 struct gfs2_sbd *sdp = GFS2_SB(dir);
1128 struct inode *inode = d_inode(dentry);
1129 struct gfs2_inode *ip = GFS2_I(inode);
1130 struct gfs2_holder ghs[3];
1131 struct gfs2_rgrpd *rgd;
1134 error = gfs2_rindex_update(sdp);
1140 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1141 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
1143 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1147 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
1150 error = gfs2_glock_nq(ghs); /* parent */
1154 error = gfs2_glock_nq(ghs + 1); /* child */
1159 if (inode->i_nlink == 0)
1162 if (S_ISDIR(inode->i_mode)) {
1164 if (ip->i_entries > 2 || inode->i_nlink > 2)
1168 error = gfs2_glock_nq(ghs + 2); /* rgrp */
1172 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
1176 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0);
1180 error = gfs2_unlink_inode(dip, dentry);
1181 gfs2_trans_end(sdp);
1184 gfs2_glock_dq(ghs + 2);
1186 gfs2_glock_dq(ghs + 1);
1190 gfs2_holder_uninit(ghs + 2);
1192 gfs2_holder_uninit(ghs + 1);
1193 gfs2_holder_uninit(ghs);
1198 * gfs2_symlink - Create a symlink
1199 * @dir: The directory to create the symlink in
1200 * @dentry: The dentry to put the symlink in
1201 * @symname: The thing which the link points to
1206 static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
1207 const char *symname)
1211 size = strlen(symname);
1212 if (size >= gfs2_max_stuffed_size(GFS2_I(dir)))
1213 return -ENAMETOOLONG;
1215 return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0);
1219 * gfs2_mkdir - Make a directory
1220 * @dir: The parent directory of the new one
1221 * @dentry: The dentry of the new directory
1222 * @mode: The mode of the new directory
1227 static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
1229 unsigned dsize = gfs2_max_stuffed_size(GFS2_I(dir));
1230 return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0);
1234 * gfs2_mknod - Make a special file
1235 * @dir: The directory in which the special file will reside
1236 * @dentry: The dentry of the special file
1237 * @mode: The mode of the special file
1238 * @dev: The device specification of the special file
1242 static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
1245 return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0);
1249 * gfs2_atomic_open - Atomically open a file
1250 * @dir: The directory
1251 * @dentry: The proposed new entry
1252 * @file: The proposed new struct file
1253 * @flags: open flags
1256 * Returns: error code or 0 for success
1259 static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry,
1260 struct file *file, unsigned flags,
1264 bool excl = !!(flags & O_EXCL);
1266 if (!d_in_lookup(dentry))
1269 d = __gfs2_lookup(dir, dentry, file);
1274 if (d_really_is_positive(dentry)) {
1275 if (!(file->f_mode & FMODE_OPENED))
1276 return finish_no_open(file, d);
1278 return excl && (flags & O_CREAT) ? -EEXIST : 0;
1284 if (!(flags & O_CREAT))
1287 return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl);
1291 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1295 * Follow @to back to the root and make sure we don't encounter @this
1296 * Assumes we already hold the rename lock.
1301 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1303 struct inode *dir = &to->i_inode;
1304 struct super_block *sb = dir->i_sb;
1311 if (dir == &this->i_inode) {
1315 if (dir == d_inode(sb->s_root)) {
1320 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
1326 error = PTR_ERR(tmp);
1340 * update_moved_ino - Update an inode that's being moved
1341 * @ip: The inode being moved
1342 * @ndip: The parent directory of the new filename
1343 * @dir_rename: True of ip is a directory
1348 static int update_moved_ino(struct gfs2_inode *ip, struct gfs2_inode *ndip,
1352 return gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);
1354 ip->i_inode.i_ctime = current_time(&ip->i_inode);
1355 mark_inode_dirty_sync(&ip->i_inode);
1361 * gfs2_rename - Rename a file
1362 * @odir: Parent directory of old file name
1363 * @odentry: The old dentry of the file
1364 * @ndir: Parent directory of new file name
1365 * @ndentry: The new dentry of the file
1370 static int gfs2_rename(struct inode *odir, struct dentry *odentry,
1371 struct inode *ndir, struct dentry *ndentry)
1373 struct gfs2_inode *odip = GFS2_I(odir);
1374 struct gfs2_inode *ndip = GFS2_I(ndir);
1375 struct gfs2_inode *ip = GFS2_I(d_inode(odentry));
1376 struct gfs2_inode *nip = NULL;
1377 struct gfs2_sbd *sdp = GFS2_SB(odir);
1378 struct gfs2_holder ghs[4], r_gh, rd_gh;
1379 struct gfs2_rgrpd *nrgd;
1380 unsigned int num_gh;
1382 struct gfs2_diradd da = { .nr_blocks = 0, .save_loc = 0, };
1386 gfs2_holder_mark_uninitialized(&r_gh);
1387 gfs2_holder_mark_uninitialized(&rd_gh);
1388 if (d_really_is_positive(ndentry)) {
1389 nip = GFS2_I(d_inode(ndentry));
1394 error = gfs2_rindex_update(sdp);
1398 error = gfs2_qa_get(ndip);
1403 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1408 if (S_ISDIR(ip->i_inode.i_mode)) {
1410 /* don't move a directory into its subdir */
1411 error = gfs2_ok_to_move(ip, ndip);
1418 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs);
1420 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE,GL_ASYNC,
1424 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh);
1428 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC,
1433 for (x = 0; x < num_gh; x++) {
1434 error = gfs2_glock_nq(ghs + x);
1438 error = gfs2_glock_async_wait(num_gh, ghs);
1443 /* Grab the resource group glock for unlink flag twiddling.
1444 * This is the case where the target dinode already exists
1445 * so we unlink before doing the rename.
1447 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1);
1452 error = gfs2_glock_nq_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0,
1459 if (ip->i_inode.i_nlink == 0)
1462 /* Check out the old directory */
1464 error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
1468 /* Check out the new directory */
1471 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1475 if (nip->i_inode.i_nlink == 0) {
1480 if (S_ISDIR(nip->i_inode.i_mode)) {
1481 if (nip->i_entries < 2) {
1482 gfs2_consist_inode(nip);
1486 if (nip->i_entries > 2) {
1492 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC);
1496 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
1508 if (!ndip->i_inode.i_nlink) {
1512 if (ndip->i_entries == (u32)-1) {
1516 if (S_ISDIR(ip->i_inode.i_mode) &&
1517 ndip->i_inode.i_nlink == (u32)-1) {
1524 /* Check out the dir to be renamed */
1527 error = gfs2_permission(d_inode(odentry), MAY_WRITE);
1533 error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da);
1539 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
1540 error = gfs2_quota_lock_check(ndip, &ap);
1544 error = gfs2_inplace_reserve(ndip, &ap);
1548 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) +
1549 4 * RES_LEAF + 4, 0);
1553 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
1554 5 * RES_LEAF + 4, 0);
1559 /* Remove the target file, if it exists */
1562 error = gfs2_unlink_inode(ndip, ndentry);
1564 error = update_moved_ino(ip, ndip, dir_rename);
1568 error = gfs2_dir_del(odip, odentry);
1572 error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da);
1577 gfs2_trans_end(sdp);
1580 gfs2_inplace_release(ndip);
1583 gfs2_quota_unlock(ndip);
1585 gfs2_dir_no_add(&da);
1586 if (gfs2_holder_initialized(&rd_gh))
1587 gfs2_glock_dq_uninit(&rd_gh);
1590 if (gfs2_holder_queued(ghs + x))
1591 gfs2_glock_dq(ghs + x);
1592 gfs2_holder_uninit(ghs + x);
1595 if (gfs2_holder_initialized(&r_gh))
1596 gfs2_glock_dq_uninit(&r_gh);
1603 * gfs2_exchange - exchange two files
1604 * @odir: Parent directory of old file name
1605 * @odentry: The old dentry of the file
1606 * @ndir: Parent directory of new file name
1607 * @ndentry: The new dentry of the file
1608 * @flags: The rename flags
1613 static int gfs2_exchange(struct inode *odir, struct dentry *odentry,
1614 struct inode *ndir, struct dentry *ndentry,
1617 struct gfs2_inode *odip = GFS2_I(odir);
1618 struct gfs2_inode *ndip = GFS2_I(ndir);
1619 struct gfs2_inode *oip = GFS2_I(odentry->d_inode);
1620 struct gfs2_inode *nip = GFS2_I(ndentry->d_inode);
1621 struct gfs2_sbd *sdp = GFS2_SB(odir);
1622 struct gfs2_holder ghs[4], r_gh;
1623 unsigned int num_gh;
1625 umode_t old_mode = oip->i_inode.i_mode;
1626 umode_t new_mode = nip->i_inode.i_mode;
1629 gfs2_holder_mark_uninitialized(&r_gh);
1630 error = gfs2_rindex_update(sdp);
1635 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1640 if (S_ISDIR(old_mode)) {
1641 /* don't move a directory into its subdir */
1642 error = gfs2_ok_to_move(oip, ndip);
1647 if (S_ISDIR(new_mode)) {
1648 /* don't move a directory into its subdir */
1649 error = gfs2_ok_to_move(nip, odip);
1656 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs);
1658 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC,
1662 gfs2_holder_init(oip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh);
1665 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh);
1668 for (x = 0; x < num_gh; x++) {
1669 error = gfs2_glock_nq(ghs + x);
1674 error = gfs2_glock_async_wait(num_gh, ghs);
1679 if (oip->i_inode.i_nlink == 0 || nip->i_inode.i_nlink == 0)
1682 error = gfs2_unlink_ok(odip, &odentry->d_name, oip);
1685 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1689 if (S_ISDIR(old_mode)) {
1690 error = gfs2_permission(odentry->d_inode, MAY_WRITE);
1694 if (S_ISDIR(new_mode)) {
1695 error = gfs2_permission(ndentry->d_inode, MAY_WRITE);
1699 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 4 * RES_LEAF, 0);
1703 error = update_moved_ino(oip, ndip, S_ISDIR(old_mode));
1707 error = update_moved_ino(nip, odip, S_ISDIR(new_mode));
1711 error = gfs2_dir_mvino(ndip, &ndentry->d_name, oip,
1716 error = gfs2_dir_mvino(odip, &odentry->d_name, nip,
1722 if (S_ISDIR(new_mode) && !S_ISDIR(old_mode)) {
1723 inc_nlink(&odip->i_inode);
1724 drop_nlink(&ndip->i_inode);
1725 } else if (S_ISDIR(old_mode) && !S_ISDIR(new_mode)) {
1726 inc_nlink(&ndip->i_inode);
1727 drop_nlink(&odip->i_inode);
1730 mark_inode_dirty(&ndip->i_inode);
1732 mark_inode_dirty(&odip->i_inode);
1735 gfs2_trans_end(sdp);
1738 if (gfs2_holder_queued(ghs + x))
1739 gfs2_glock_dq(ghs + x);
1740 gfs2_holder_uninit(ghs + x);
1743 if (gfs2_holder_initialized(&r_gh))
1744 gfs2_glock_dq_uninit(&r_gh);
1749 static int gfs2_rename2(struct inode *odir, struct dentry *odentry,
1750 struct inode *ndir, struct dentry *ndentry,
1753 flags &= ~RENAME_NOREPLACE;
1755 if (flags & ~RENAME_EXCHANGE)
1758 if (flags & RENAME_EXCHANGE)
1759 return gfs2_exchange(odir, odentry, ndir, ndentry, flags);
1761 return gfs2_rename(odir, odentry, ndir, ndentry);
1765 * gfs2_get_link - Follow a symbolic link
1766 * @dentry: The dentry of the link
1767 * @inode: The inode of the link
1768 * @done: destructor for return value
1770 * This can handle symlinks of any size.
1772 * Returns: 0 on success or error code
1775 static const char *gfs2_get_link(struct dentry *dentry,
1776 struct inode *inode,
1777 struct delayed_call *done)
1779 struct gfs2_inode *ip = GFS2_I(inode);
1780 struct gfs2_holder i_gh;
1781 struct buffer_head *dibh;
1787 return ERR_PTR(-ECHILD);
1789 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1790 error = gfs2_glock_nq(&i_gh);
1792 gfs2_holder_uninit(&i_gh);
1793 return ERR_PTR(error);
1796 size = (unsigned int)i_size_read(&ip->i_inode);
1798 gfs2_consist_inode(ip);
1799 buf = ERR_PTR(-EIO);
1803 error = gfs2_meta_inode_buffer(ip, &dibh);
1805 buf = ERR_PTR(error);
1809 buf = kzalloc(size + 1, GFP_NOFS);
1811 buf = ERR_PTR(-ENOMEM);
1813 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
1816 gfs2_glock_dq_uninit(&i_gh);
1818 set_delayed_call(done, kfree_link, buf);
1825 * @mask: The mask to be tested
1826 * @flags: Indicates whether this is an RCU path walk or not
1828 * This may be called from the VFS directly, or from within GFS2 with the
1829 * inode locked, so we look to see if the glock is already locked and only
1830 * lock the glock if its not already been done.
1835 int gfs2_permission(struct inode *inode, int mask)
1837 struct gfs2_inode *ip;
1838 struct gfs2_holder i_gh;
1841 gfs2_holder_mark_uninitialized(&i_gh);
1843 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1844 if (mask & MAY_NOT_BLOCK)
1846 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1851 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1854 error = generic_permission(inode, mask);
1855 if (gfs2_holder_initialized(&i_gh))
1856 gfs2_glock_dq_uninit(&i_gh);
1861 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1863 setattr_copy(inode, attr);
1864 mark_inode_dirty(inode);
1869 * gfs2_setattr_simple -
1876 int gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1880 if (current->journal_info)
1881 return __gfs2_setattr_simple(inode, attr);
1883 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0);
1887 error = __gfs2_setattr_simple(inode, attr);
1888 gfs2_trans_end(GFS2_SB(inode));
1892 static int setattr_chown(struct inode *inode, struct iattr *attr)
1894 struct gfs2_inode *ip = GFS2_I(inode);
1895 struct gfs2_sbd *sdp = GFS2_SB(inode);
1899 struct gfs2_alloc_parms ap;
1901 ouid = inode->i_uid;
1902 ogid = inode->i_gid;
1903 nuid = attr->ia_uid;
1904 ngid = attr->ia_gid;
1906 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid))
1907 ouid = nuid = NO_UID_QUOTA_CHANGE;
1908 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid))
1909 ogid = ngid = NO_GID_QUOTA_CHANGE;
1910 error = gfs2_qa_get(ip);
1914 error = gfs2_rindex_update(sdp);
1918 error = gfs2_quota_lock(ip, nuid, ngid);
1922 ap.target = gfs2_get_inode_blocks(&ip->i_inode);
1924 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1925 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1926 error = gfs2_quota_check(ip, nuid, ngid, &ap);
1931 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1935 error = gfs2_setattr_simple(inode, attr);
1939 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1940 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1941 gfs2_quota_change(ip, -(s64)ap.target, ouid, ogid);
1942 gfs2_quota_change(ip, ap.target, nuid, ngid);
1946 gfs2_trans_end(sdp);
1948 gfs2_quota_unlock(ip);
1955 * gfs2_setattr - Change attributes on an inode
1956 * @dentry: The dentry which is changing
1957 * @attr: The structure describing the change
1959 * The VFS layer wants to change one or more of an inodes attributes. Write
1960 * that change out to disk.
1965 static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
1967 struct inode *inode = d_inode(dentry);
1968 struct gfs2_inode *ip = GFS2_I(inode);
1969 struct gfs2_holder i_gh;
1972 error = gfs2_qa_get(ip);
1976 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1981 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1984 error = setattr_prepare(dentry, attr);
1988 if (attr->ia_valid & ATTR_SIZE)
1989 error = gfs2_setattr_size(inode, attr->ia_size);
1990 else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1991 error = setattr_chown(inode, attr);
1993 error = gfs2_setattr_simple(inode, attr);
1994 if (!error && attr->ia_valid & ATTR_MODE)
1995 error = posix_acl_chmod(inode, inode->i_mode);
2000 mark_inode_dirty(inode);
2001 gfs2_glock_dq_uninit(&i_gh);
2008 * gfs2_getattr - Read out an inode's attributes
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
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.
2023 static int gfs2_getattr(const struct path *path, struct kstat *stat,
2024 u32 request_mask, unsigned int flags)
2026 struct inode *inode = d_inode(path->dentry);
2027 struct gfs2_inode *ip = GFS2_I(inode);
2028 struct gfs2_holder gh;
2032 gfs2_holder_mark_uninitialized(&gh);
2033 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
2034 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
2039 gfsflags = ip->i_diskflags;
2040 if (gfsflags & GFS2_DIF_APPENDONLY)
2041 stat->attributes |= STATX_ATTR_APPEND;
2042 if (gfsflags & GFS2_DIF_IMMUTABLE)
2043 stat->attributes |= STATX_ATTR_IMMUTABLE;
2045 stat->attributes_mask |= (STATX_ATTR_APPEND |
2046 STATX_ATTR_COMPRESSED |
2047 STATX_ATTR_ENCRYPTED |
2048 STATX_ATTR_IMMUTABLE |
2051 generic_fillattr(inode, stat);
2053 if (gfs2_holder_initialized(&gh))
2054 gfs2_glock_dq_uninit(&gh);
2059 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
2062 struct gfs2_inode *ip = GFS2_I(inode);
2063 struct gfs2_holder gh;
2066 inode_lock_shared(inode);
2068 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2072 ret = iomap_fiemap(inode, fieinfo, start, len, &gfs2_iomap_ops);
2074 gfs2_glock_dq_uninit(&gh);
2077 inode_unlock_shared(inode);
2081 loff_t gfs2_seek_data(struct file *file, loff_t offset)
2083 struct inode *inode = file->f_mapping->host;
2084 struct gfs2_inode *ip = GFS2_I(inode);
2085 struct gfs2_holder gh;
2088 inode_lock_shared(inode);
2089 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2091 ret = iomap_seek_data(inode, offset, &gfs2_iomap_ops);
2092 gfs2_glock_dq_uninit(&gh);
2093 inode_unlock_shared(inode);
2097 return vfs_setpos(file, ret, inode->i_sb->s_maxbytes);
2100 loff_t gfs2_seek_hole(struct file *file, loff_t offset)
2102 struct inode *inode = file->f_mapping->host;
2103 struct gfs2_inode *ip = GFS2_I(inode);
2104 struct gfs2_holder gh;
2107 inode_lock_shared(inode);
2108 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2110 ret = iomap_seek_hole(inode, offset, &gfs2_iomap_ops);
2111 gfs2_glock_dq_uninit(&gh);
2112 inode_unlock_shared(inode);
2116 return vfs_setpos(file, ret, inode->i_sb->s_maxbytes);
2119 const struct inode_operations gfs2_file_iops = {
2120 .permission = gfs2_permission,
2121 .setattr = gfs2_setattr,
2122 .getattr = gfs2_getattr,
2123 .listxattr = gfs2_listxattr,
2124 .fiemap = gfs2_fiemap,
2125 .get_acl = gfs2_get_acl,
2126 .set_acl = gfs2_set_acl,
2129 const struct inode_operations gfs2_dir_iops = {
2130 .create = gfs2_create,
2131 .lookup = gfs2_lookup,
2133 .unlink = gfs2_unlink,
2134 .symlink = gfs2_symlink,
2135 .mkdir = gfs2_mkdir,
2136 .rmdir = gfs2_unlink,
2137 .mknod = gfs2_mknod,
2138 .rename = gfs2_rename2,
2139 .permission = gfs2_permission,
2140 .setattr = gfs2_setattr,
2141 .getattr = gfs2_getattr,
2142 .listxattr = gfs2_listxattr,
2143 .fiemap = gfs2_fiemap,
2144 .get_acl = gfs2_get_acl,
2145 .set_acl = gfs2_set_acl,
2146 .atomic_open = gfs2_atomic_open,
2149 const struct inode_operations gfs2_symlink_iops = {
2150 .get_link = gfs2_get_link,
2151 .permission = gfs2_permission,
2152 .setattr = gfs2_setattr,
2153 .getattr = gfs2_getattr,
2154 .listxattr = gfs2_listxattr,
2155 .fiemap = gfs2_fiemap,