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;
44 * gfs2_set_iop - Sets inode operations
45 * @inode: The inode with correct i_mode filled in
47 * GFS2 lookup code fills in vfs inode contents based on info obtained
48 * from directory entry inside gfs2_inode_lookup().
51 static void gfs2_set_iop(struct inode *inode)
53 struct gfs2_sbd *sdp = GFS2_SB(inode);
54 umode_t mode = inode->i_mode;
57 inode->i_op = &gfs2_file_iops;
58 if (gfs2_localflocks(sdp))
59 inode->i_fop = &gfs2_file_fops_nolock;
61 inode->i_fop = &gfs2_file_fops;
62 } else if (S_ISDIR(mode)) {
63 inode->i_op = &gfs2_dir_iops;
64 if (gfs2_localflocks(sdp))
65 inode->i_fop = &gfs2_dir_fops_nolock;
67 inode->i_fop = &gfs2_dir_fops;
68 } else if (S_ISLNK(mode)) {
69 inode->i_op = &gfs2_symlink_iops;
71 inode->i_op = &gfs2_file_iops;
72 init_special_inode(inode, inode->i_mode, inode->i_rdev);
76 static int iget_test(struct inode *inode, void *opaque)
78 u64 no_addr = *(u64 *)opaque;
80 return GFS2_I(inode)->i_no_addr == no_addr;
83 static int iget_set(struct inode *inode, void *opaque)
85 u64 no_addr = *(u64 *)opaque;
87 GFS2_I(inode)->i_no_addr = no_addr;
88 inode->i_ino = no_addr;
93 * gfs2_inode_lookup - Lookup an inode
94 * @sb: The super block
95 * @type: The type of the inode
96 * @no_addr: The inode number
97 * @no_formal_ino: The inode generation number
98 * @blktype: Requested block type (GFS2_BLKST_DINODE or GFS2_BLKST_UNLINKED;
99 * GFS2_BLKST_FREE to indicate not to verify)
101 * If @type is DT_UNKNOWN, the inode type is fetched from disk.
103 * If @blktype is anything other than GFS2_BLKST_FREE (which is used as a
104 * placeholder because it doesn't otherwise make sense), the on-disk block type
105 * is verified to be @blktype.
107 * When @no_formal_ino is non-zero, this function will return ERR_PTR(-ESTALE)
108 * if it detects that @no_formal_ino doesn't match the actual inode generation
109 * number. However, it doesn't always know unless @type is DT_UNKNOWN.
111 * Returns: A VFS inode, or an error
114 struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type,
115 u64 no_addr, u64 no_formal_ino,
116 unsigned int blktype)
119 struct gfs2_inode *ip;
120 struct gfs2_holder i_gh;
123 gfs2_holder_mark_uninitialized(&i_gh);
124 inode = iget5_locked(sb, no_addr, iget_test, iget_set, &no_addr);
126 return ERR_PTR(-ENOMEM);
130 if (inode->i_state & I_NEW) {
131 struct gfs2_sbd *sdp = GFS2_SB(inode);
132 struct gfs2_glock *io_gl;
135 error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE,
140 error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE,
145 if (blktype == GFS2_BLKST_UNLINKED)
146 extra_flags |= LM_FLAG_TRY;
148 gfs2_cancel_delete_work(io_gl);
149 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED,
150 GL_EXACT | GL_NOPID | extra_flags,
152 gfs2_glock_put(io_gl);
156 if (type == DT_UNKNOWN || blktype != GFS2_BLKST_FREE) {
158 * The GL_SKIP flag indicates to skip reading the inode
159 * block. We read the inode when instantiating it
160 * after possibly checking the block type.
162 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE,
169 gfs2_inode_already_deleted(ip->i_gl, no_formal_ino))
172 if (blktype != GFS2_BLKST_FREE) {
173 error = gfs2_check_blk_type(sdp, no_addr,
180 set_bit(GLF_INSTANTIATE_NEEDED, &ip->i_gl->gl_flags);
182 /* Lowest possible timestamp; will be overwritten in gfs2_dinode_in. */
183 inode->i_atime.tv_sec = 1LL << (8 * sizeof(inode->i_atime.tv_sec) - 1);
184 inode->i_atime.tv_nsec = 0;
186 glock_set_object(ip->i_gl, ip);
188 if (type == DT_UNKNOWN) {
189 /* Inode glock must be locked already */
190 error = gfs2_instantiate(&i_gh);
192 glock_clear_object(ip->i_gl, ip);
196 ip->i_no_formal_ino = no_formal_ino;
197 inode->i_mode = DT2IF(type);
200 if (gfs2_holder_initialized(&i_gh))
201 gfs2_glock_dq_uninit(&i_gh);
202 glock_set_object(ip->i_iopen_gh.gh_gl, ip);
205 unlock_new_inode(inode);
208 if (no_formal_ino && ip->i_no_formal_ino &&
209 no_formal_ino != ip->i_no_formal_ino) {
211 return ERR_PTR(-ESTALE);
217 if (error == GLR_TRYFAILED)
219 if (gfs2_holder_initialized(&ip->i_iopen_gh))
220 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
221 if (gfs2_holder_initialized(&i_gh))
222 gfs2_glock_dq_uninit(&i_gh);
224 return ERR_PTR(error);
228 * gfs2_lookup_by_inum - look up an inode by inode number
229 * @sdp: The super block
230 * @no_addr: The inode number
231 * @no_formal_ino: The inode generation number (0 for any)
232 * @blktype: Requested block type (see gfs2_inode_lookup)
234 struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr,
235 u64 no_formal_ino, unsigned int blktype)
237 struct super_block *sb = sdp->sd_vfs;
241 inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, no_formal_ino,
248 if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM)
255 return ERR_PTR(error);
259 struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
263 gfs2_str2qstr(&qstr, name);
264 inode = gfs2_lookupi(dip, &qstr, 1);
265 /* gfs2_lookupi has inconsistent callers: vfs
266 * related routines expect NULL for no entry found,
267 * gfs2_lookup_simple callers expect ENOENT
268 * and do not check for NULL.
271 return ERR_PTR(-ENOENT);
278 * gfs2_lookupi - Look up a filename in a directory and return its inode
279 * @dir: The inode of the directory containing the inode to look-up
280 * @name: The name of the inode to look for
281 * @is_root: If 1, ignore the caller's permissions
283 * This can be called via the VFS filldir function when NFS is doing
284 * a readdirplus and the inode which its intending to stat isn't
285 * already in cache. In this case we must not take the directory glock
286 * again, since the readdir call will have already taken that lock.
291 struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
294 struct super_block *sb = dir->i_sb;
295 struct gfs2_inode *dip = GFS2_I(dir);
296 struct gfs2_holder d_gh;
298 struct inode *inode = NULL;
300 gfs2_holder_mark_uninitialized(&d_gh);
301 if (!name->len || name->len > GFS2_FNAMESIZE)
302 return ERR_PTR(-ENAMETOOLONG);
304 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
305 (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
306 dir == d_inode(sb->s_root))) {
311 if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) {
312 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
314 return ERR_PTR(error);
318 error = gfs2_permission(&init_user_ns, dir, MAY_EXEC);
323 inode = gfs2_dir_search(dir, name, false);
325 error = PTR_ERR(inode);
327 if (gfs2_holder_initialized(&d_gh))
328 gfs2_glock_dq_uninit(&d_gh);
329 if (error == -ENOENT)
331 return inode ? inode : ERR_PTR(error);
335 * create_ok - OK to create a new on-disk inode here?
336 * @dip: Directory in which dinode is to be created
337 * @name: Name of new dinode
343 static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
348 error = gfs2_permission(&init_user_ns, &dip->i_inode,
349 MAY_WRITE | MAY_EXEC);
353 /* Don't create entries in an unlinked directory */
354 if (!dip->i_inode.i_nlink)
357 if (dip->i_entries == (u32)-1)
359 if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1)
365 static void munge_mode_uid_gid(const struct gfs2_inode *dip,
368 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
369 (dip->i_inode.i_mode & S_ISUID) &&
370 !uid_eq(dip->i_inode.i_uid, GLOBAL_ROOT_UID)) {
371 if (S_ISDIR(inode->i_mode))
372 inode->i_mode |= S_ISUID;
373 else if (!uid_eq(dip->i_inode.i_uid, current_fsuid()))
374 inode->i_mode &= ~07111;
375 inode->i_uid = dip->i_inode.i_uid;
377 inode->i_uid = current_fsuid();
379 if (dip->i_inode.i_mode & S_ISGID) {
380 if (S_ISDIR(inode->i_mode))
381 inode->i_mode |= S_ISGID;
382 inode->i_gid = dip->i_inode.i_gid;
384 inode->i_gid = current_fsgid();
387 static int alloc_dinode(struct gfs2_inode *ip, u32 flags, unsigned *dblocks)
389 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
390 struct gfs2_alloc_parms ap = { .target = *dblocks, .aflags = flags, };
393 error = gfs2_quota_lock_check(ip, &ap);
397 error = gfs2_inplace_reserve(ip, &ap);
401 error = gfs2_trans_begin(sdp, (*dblocks * RES_RG_BIT) + RES_STATFS + RES_QUOTA, 0);
405 error = gfs2_alloc_blocks(ip, &ip->i_no_addr, dblocks, 1, &ip->i_generation);
406 ip->i_no_formal_ino = ip->i_generation;
407 ip->i_inode.i_ino = ip->i_no_addr;
408 ip->i_goal = ip->i_no_addr;
413 gfs2_inplace_release(ip);
415 gfs2_quota_unlock(ip);
420 static void gfs2_init_dir(struct buffer_head *dibh,
421 const struct gfs2_inode *parent)
423 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
424 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
426 gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent);
427 dent->de_inum = di->di_num; /* already GFS2 endian */
428 dent->de_type = cpu_to_be16(DT_DIR);
430 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
431 gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
432 gfs2_inum_out(parent, dent);
433 dent->de_type = cpu_to_be16(DT_DIR);
438 * gfs2_init_xattr - Initialise an xattr block for a new inode
439 * @ip: The inode in question
441 * This sets up an empty xattr block for a new inode, ready to
442 * take any ACLs, LSM xattrs, etc.
445 static void gfs2_init_xattr(struct gfs2_inode *ip)
447 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
448 struct buffer_head *bh;
449 struct gfs2_ea_header *ea;
451 bh = gfs2_meta_new(ip->i_gl, ip->i_eattr);
452 gfs2_trans_add_meta(ip->i_gl, bh);
453 gfs2_metatype_set(bh, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
454 gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header));
456 ea = GFS2_EA_BH2FIRST(bh);
457 ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
458 ea->ea_type = GFS2_EATYPE_UNUSED;
459 ea->ea_flags = GFS2_EAFLAG_LAST;
465 * init_dinode - Fill in a new dinode structure
466 * @dip: The directory this inode is being created in
468 * @symname: The symlink destination (if a symlink)
472 static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip,
475 struct gfs2_dinode *di;
476 struct buffer_head *dibh;
478 dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr);
479 gfs2_trans_add_meta(ip->i_gl, dibh);
480 di = (struct gfs2_dinode *)dibh->b_data;
481 gfs2_dinode_out(ip, di);
483 di->di_major = cpu_to_be32(imajor(&ip->i_inode));
484 di->di_minor = cpu_to_be32(iminor(&ip->i_inode));
488 memset(&di->__pad4, 0, sizeof(di->__pad4));
489 memset(&di->di_reserved, 0, sizeof(di->di_reserved));
490 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
492 switch(ip->i_inode.i_mode & S_IFMT) {
494 gfs2_init_dir(dibh, dip);
497 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size);
501 set_buffer_uptodate(dibh);
506 * gfs2_trans_da_blks - Calculate number of blocks to link inode
507 * @dip: The directory we are linking into
508 * @da: The dir add information
509 * @nr_inodes: The number of inodes involved
511 * This calculate the number of blocks we need to reserve in a
512 * transaction to link @nr_inodes into a directory. In most cases
513 * @nr_inodes will be 2 (the directory plus the inode being linked in)
514 * but in case of rename, 4 may be required.
516 * Returns: Number of blocks
519 static unsigned gfs2_trans_da_blks(const struct gfs2_inode *dip,
520 const struct gfs2_diradd *da,
523 return da->nr_blocks + gfs2_rg_blocks(dip, da->nr_blocks) +
524 (nr_inodes * RES_DINODE) + RES_QUOTA + RES_STATFS;
527 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
528 struct gfs2_inode *ip, struct gfs2_diradd *da)
530 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
531 struct gfs2_alloc_parms ap = { .target = da->nr_blocks, };
535 error = gfs2_quota_lock_check(dip, &ap);
537 goto fail_quota_locks;
539 error = gfs2_inplace_reserve(dip, &ap);
541 goto fail_quota_locks;
543 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, da, 2), 0);
547 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
549 goto fail_quota_locks;
552 error = gfs2_dir_add(&dip->i_inode, name, ip, da);
556 gfs2_inplace_release(dip);
558 gfs2_quota_unlock(dip);
562 static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
565 const struct xattr *xattr;
568 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
569 err = __gfs2_xattr_set(inode, xattr->name, xattr->value,
571 GFS2_EATYPE_SECURITY);
579 * gfs2_create_inode - Create a new inode
580 * @dir: The parent directory
581 * @dentry: The new dentry
582 * @file: If non-NULL, the file which is being opened
583 * @mode: The permissions on the new inode
584 * @dev: For device nodes, this is the device number
585 * @symname: For symlinks, this is the link destination
586 * @size: The initial size of the inode (ignored for directories)
587 * @excl: Force fail if inode exists
589 * Returns: 0 on success, or error code
592 static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
594 umode_t mode, dev_t dev, const char *symname,
595 unsigned int size, int excl)
597 const struct qstr *name = &dentry->d_name;
598 struct posix_acl *default_acl, *acl;
599 struct gfs2_holder ghs[2];
600 struct inode *inode = NULL;
601 struct gfs2_inode *dip = GFS2_I(dir), *ip;
602 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
603 struct gfs2_glock *io_gl;
604 int error, free_vfs_inode = 1;
607 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
609 if (!name->len || name->len > GFS2_FNAMESIZE)
610 return -ENAMETOOLONG;
612 error = gfs2_qa_get(dip);
616 error = gfs2_rindex_update(sdp);
620 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
623 gfs2_holder_mark_uninitialized(ghs + 1);
625 error = create_ok(dip, name, mode);
629 inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl);
630 error = PTR_ERR(inode);
631 if (!IS_ERR(inode)) {
632 if (S_ISDIR(inode->i_mode)) {
634 inode = ERR_PTR(-EISDIR);
637 d_instantiate(dentry, inode);
640 if (S_ISREG(inode->i_mode))
641 error = finish_open(file, dentry, gfs2_open_common);
643 error = finish_no_open(file, NULL);
645 gfs2_glock_dq_uninit(ghs);
647 } else if (error != -ENOENT) {
651 error = gfs2_diradd_alloc_required(dir, name, &da);
655 inode = new_inode(sdp->sd_vfs);
660 error = posix_acl_create(dir, &mode, &default_acl, &acl);
665 error = gfs2_qa_get(ip);
669 inode->i_mode = mode;
670 set_nlink(inode, S_ISDIR(mode) ? 2 : 1);
672 inode->i_size = size;
673 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
674 munge_mode_uid_gid(dip, inode);
675 check_and_update_goal(dip);
676 ip->i_goal = dip->i_goal;
682 ip->i_no_addr = 0; /* Temporarily zero until real addr is assigned */
684 switch(mode & S_IFMT) {
686 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) ||
687 gfs2_tune_get(sdp, gt_new_files_jdata))
688 ip->i_diskflags |= GFS2_DIF_JDATA;
689 gfs2_set_aops(inode);
692 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA);
693 ip->i_diskflags |= GFS2_DIF_JDATA;
698 /* Force SYSTEM flag on all files and subdirs of a SYSTEM directory */
699 if (dip->i_diskflags & GFS2_DIF_SYSTEM)
700 ip->i_diskflags |= GFS2_DIF_SYSTEM;
702 gfs2_set_inode_flags(inode);
704 if ((GFS2_I(d_inode(sdp->sd_root_dir)) == dip) ||
705 (dip->i_diskflags & GFS2_DIF_TOPDIR))
706 aflags |= GFS2_AF_ORLOV;
708 if (default_acl || acl)
711 error = alloc_dinode(ip, aflags, &blocks);
713 goto fail_free_inode;
715 gfs2_set_inode_blocks(inode, blocks);
717 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
719 goto fail_free_inode;
721 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
723 goto fail_free_inode;
724 gfs2_cancel_delete_work(io_gl);
726 error = insert_inode_locked4(inode, ip->i_no_addr, iget_test, &ip->i_no_addr);
729 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT | GL_NOPID,
734 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
738 error = gfs2_trans_begin(sdp, blocks, 0);
743 ip->i_eattr = ip->i_no_addr + 1;
746 init_dinode(dip, ip, symname);
749 glock_set_object(ip->i_gl, ip);
750 glock_set_object(io_gl, ip);
753 free_vfs_inode = 0; /* After this point, the inode is no longer
754 considered free. Any failures need to undo
755 the gfs2 structures. */
757 error = __gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
760 posix_acl_release(default_acl);
764 error = __gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS);
767 posix_acl_release(acl);
771 error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name,
772 &gfs2_initxattrs, NULL);
776 error = link_dinode(dip, name, ip, &da);
780 mark_inode_dirty(inode);
781 d_instantiate(dentry, inode);
782 /* After instantiate, errors should result in evict which will destroy
783 * both inode and iopen glocks properly. */
785 file->f_mode |= FMODE_CREATED;
786 error = finish_open(file, dentry, gfs2_open_common);
788 gfs2_glock_dq_uninit(ghs);
790 gfs2_glock_dq_uninit(ghs + 1);
791 gfs2_glock_put(io_gl);
793 unlock_new_inode(inode);
797 glock_clear_object(ip->i_gl, ip);
798 glock_clear_object(io_gl, ip);
800 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
802 gfs2_glock_put(io_gl);
805 if (free_vfs_inode) /* else evict will do the put for us */
806 gfs2_glock_put(ip->i_gl);
808 gfs2_rs_deltree(&ip->i_res);
811 posix_acl_release(default_acl);
812 posix_acl_release(acl);
814 gfs2_dir_no_add(&da);
815 gfs2_glock_dq_uninit(ghs);
816 if (!IS_ERR_OR_NULL(inode)) {
819 mark_inode_dirty(inode);
820 set_bit(free_vfs_inode ? GIF_FREE_VFS_INODE : GIF_ALLOC_FAILED,
821 &GFS2_I(inode)->i_flags);
822 if (inode->i_state & I_NEW)
827 if (gfs2_holder_initialized(ghs + 1))
828 gfs2_glock_dq_uninit(ghs + 1);
835 * gfs2_create - Create a file
836 * @mnt_userns: User namespace of the mount the inode was found from
837 * @dir: The directory in which to create the file
838 * @dentry: The dentry of the new file
839 * @mode: The mode of the new file
840 * @excl: Force fail if inode exists
845 static int gfs2_create(struct user_namespace *mnt_userns, struct inode *dir,
846 struct dentry *dentry, 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(&init_user_ns, dir, MAY_WRITE | MAY_EXEC);
957 error = gfs2_dir_check(dir, &dentry->d_name, NULL);
969 if (!dip->i_inode.i_nlink)
972 if (dip->i_entries == (u32)-1)
975 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
978 if (!ip->i_inode.i_nlink)
981 if (ip->i_inode.i_nlink == (u32)-1)
984 error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da);
989 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
990 error = gfs2_quota_lock_check(dip, &ap);
994 error = gfs2_inplace_reserve(dip, &ap);
998 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0);
1002 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
1007 error = gfs2_meta_inode_buffer(ip, &dibh);
1011 error = gfs2_dir_add(dir, &dentry->d_name, ip, &da);
1015 gfs2_trans_add_meta(ip->i_gl, dibh);
1016 inc_nlink(&ip->i_inode);
1017 ip->i_inode.i_ctime = current_time(&ip->i_inode);
1019 d_instantiate(dentry, inode);
1020 mark_inode_dirty(inode);
1025 gfs2_trans_end(sdp);
1028 gfs2_inplace_release(dip);
1031 gfs2_quota_unlock(dip);
1033 gfs2_dir_no_add(&da);
1034 gfs2_glock_dq(ghs + 1);
1039 gfs2_holder_uninit(ghs);
1040 gfs2_holder_uninit(ghs + 1);
1045 * gfs2_unlink_ok - check to see that a inode is still in a directory
1046 * @dip: the directory
1047 * @name: the name of the file
1050 * Assumes that the lock on (at least) @dip is held.
1052 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
1055 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
1056 const struct gfs2_inode *ip)
1060 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
1063 if ((dip->i_inode.i_mode & S_ISVTX) &&
1064 !uid_eq(dip->i_inode.i_uid, current_fsuid()) &&
1065 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER))
1068 if (IS_APPEND(&dip->i_inode))
1071 error = gfs2_permission(&init_user_ns, &dip->i_inode,
1072 MAY_WRITE | MAY_EXEC);
1076 return gfs2_dir_check(&dip->i_inode, name, ip);
1080 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it
1081 * @dip: The parent directory
1082 * @dentry: The dentry to unlink
1084 * Called with all the locks and in a transaction. This will only be
1085 * called for a directory after it has been checked to ensure it is empty.
1087 * Returns: 0 on success, or an error
1090 static int gfs2_unlink_inode(struct gfs2_inode *dip,
1091 const struct dentry *dentry)
1093 struct inode *inode = d_inode(dentry);
1094 struct gfs2_inode *ip = GFS2_I(inode);
1097 error = gfs2_dir_del(dip, dentry);
1102 inode->i_ctime = current_time(inode);
1103 if (S_ISDIR(inode->i_mode))
1107 mark_inode_dirty(inode);
1108 if (inode->i_nlink == 0)
1109 gfs2_unlink_di(inode);
1115 * gfs2_unlink - Unlink an inode (this does rmdir as well)
1116 * @dir: The inode of the directory containing the inode to unlink
1117 * @dentry: The file itself
1119 * This routine uses the type of the inode as a flag to figure out
1120 * whether this is an unlink or an rmdir.
1125 static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
1127 struct gfs2_inode *dip = GFS2_I(dir);
1128 struct gfs2_sbd *sdp = GFS2_SB(dir);
1129 struct inode *inode = d_inode(dentry);
1130 struct gfs2_inode *ip = GFS2_I(inode);
1131 struct gfs2_holder ghs[3];
1132 struct gfs2_rgrpd *rgd;
1135 error = gfs2_rindex_update(sdp);
1141 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1142 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
1144 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1148 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, LM_FLAG_NODE_SCOPE, ghs + 2);
1151 error = gfs2_glock_nq(ghs); /* parent */
1155 error = gfs2_glock_nq(ghs + 1); /* child */
1160 if (inode->i_nlink == 0)
1163 if (S_ISDIR(inode->i_mode)) {
1165 if (ip->i_entries > 2 || inode->i_nlink > 2)
1169 error = gfs2_glock_nq(ghs + 2); /* rgrp */
1173 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
1177 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0);
1181 error = gfs2_unlink_inode(dip, dentry);
1182 gfs2_trans_end(sdp);
1185 gfs2_glock_dq(ghs + 2);
1187 gfs2_glock_dq(ghs + 1);
1191 gfs2_holder_uninit(ghs + 2);
1193 gfs2_holder_uninit(ghs + 1);
1194 gfs2_holder_uninit(ghs);
1199 * gfs2_symlink - Create a symlink
1200 * @mnt_userns: User namespace of the mount the inode was found from
1201 * @dir: The directory to create the symlink in
1202 * @dentry: The dentry to put the symlink in
1203 * @symname: The thing which the link points to
1208 static int gfs2_symlink(struct user_namespace *mnt_userns, struct inode *dir,
1209 struct dentry *dentry, const char *symname)
1213 size = strlen(symname);
1214 if (size >= gfs2_max_stuffed_size(GFS2_I(dir)))
1215 return -ENAMETOOLONG;
1217 return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0);
1221 * gfs2_mkdir - Make a directory
1222 * @mnt_userns: User namespace of the mount the inode was found from
1223 * @dir: The parent directory of the new one
1224 * @dentry: The dentry of the new directory
1225 * @mode: The mode of the new directory
1230 static int gfs2_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
1231 struct dentry *dentry, umode_t mode)
1233 unsigned dsize = gfs2_max_stuffed_size(GFS2_I(dir));
1234 return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0);
1238 * gfs2_mknod - Make a special file
1239 * @mnt_userns: User namespace of the mount the inode was found from
1240 * @dir: The directory in which the special file will reside
1241 * @dentry: The dentry of the special file
1242 * @mode: The mode of the special file
1243 * @dev: The device specification of the special file
1247 static int gfs2_mknod(struct user_namespace *mnt_userns, struct inode *dir,
1248 struct dentry *dentry, umode_t mode, dev_t dev)
1250 return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0);
1254 * gfs2_atomic_open - Atomically open a file
1255 * @dir: The directory
1256 * @dentry: The proposed new entry
1257 * @file: The proposed new struct file
1258 * @flags: open flags
1261 * Returns: error code or 0 for success
1264 static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry,
1265 struct file *file, unsigned flags,
1269 bool excl = !!(flags & O_EXCL);
1271 if (!d_in_lookup(dentry))
1274 d = __gfs2_lookup(dir, dentry, file);
1279 if (d_really_is_positive(dentry)) {
1280 if (!(file->f_mode & FMODE_OPENED))
1281 return finish_no_open(file, d);
1283 return excl && (flags & O_CREAT) ? -EEXIST : 0;
1289 if (!(flags & O_CREAT))
1292 return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl);
1296 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1300 * Follow @to back to the root and make sure we don't encounter @this
1301 * Assumes we already hold the rename lock.
1306 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1308 struct inode *dir = &to->i_inode;
1309 struct super_block *sb = dir->i_sb;
1316 if (dir == &this->i_inode) {
1320 if (dir == d_inode(sb->s_root)) {
1325 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
1331 error = PTR_ERR(tmp);
1345 * update_moved_ino - Update an inode that's being moved
1346 * @ip: The inode being moved
1347 * @ndip: The parent directory of the new filename
1348 * @dir_rename: True of ip is a directory
1353 static int update_moved_ino(struct gfs2_inode *ip, struct gfs2_inode *ndip,
1357 return gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);
1359 ip->i_inode.i_ctime = current_time(&ip->i_inode);
1360 mark_inode_dirty_sync(&ip->i_inode);
1366 * gfs2_rename - Rename a file
1367 * @odir: Parent directory of old file name
1368 * @odentry: The old dentry of the file
1369 * @ndir: Parent directory of new file name
1370 * @ndentry: The new dentry of the file
1375 static int gfs2_rename(struct inode *odir, struct dentry *odentry,
1376 struct inode *ndir, struct dentry *ndentry)
1378 struct gfs2_inode *odip = GFS2_I(odir);
1379 struct gfs2_inode *ndip = GFS2_I(ndir);
1380 struct gfs2_inode *ip = GFS2_I(d_inode(odentry));
1381 struct gfs2_inode *nip = NULL;
1382 struct gfs2_sbd *sdp = GFS2_SB(odir);
1383 struct gfs2_holder ghs[4], r_gh, rd_gh;
1384 struct gfs2_rgrpd *nrgd;
1385 unsigned int num_gh;
1387 struct gfs2_diradd da = { .nr_blocks = 0, .save_loc = 0, };
1391 gfs2_holder_mark_uninitialized(&r_gh);
1392 gfs2_holder_mark_uninitialized(&rd_gh);
1393 if (d_really_is_positive(ndentry)) {
1394 nip = GFS2_I(d_inode(ndentry));
1399 error = gfs2_rindex_update(sdp);
1403 error = gfs2_qa_get(ndip);
1408 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1413 if (S_ISDIR(ip->i_inode.i_mode)) {
1415 /* don't move a directory into its subdir */
1416 error = gfs2_ok_to_move(ip, ndip);
1423 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs);
1425 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE,GL_ASYNC,
1429 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh);
1433 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC,
1438 for (x = 0; x < num_gh; x++) {
1439 error = gfs2_glock_nq(ghs + x);
1443 error = gfs2_glock_async_wait(num_gh, ghs);
1448 /* Grab the resource group glock for unlink flag twiddling.
1449 * This is the case where the target dinode already exists
1450 * so we unlink before doing the rename.
1452 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1);
1457 error = gfs2_glock_nq_init(nrgd->rd_gl, LM_ST_EXCLUSIVE,
1458 LM_FLAG_NODE_SCOPE, &rd_gh);
1464 if (ip->i_inode.i_nlink == 0)
1467 /* Check out the old directory */
1469 error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
1473 /* Check out the new directory */
1476 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1480 if (nip->i_inode.i_nlink == 0) {
1485 if (S_ISDIR(nip->i_inode.i_mode)) {
1486 if (nip->i_entries < 2) {
1487 gfs2_consist_inode(nip);
1491 if (nip->i_entries > 2) {
1497 error = gfs2_permission(&init_user_ns, ndir,
1498 MAY_WRITE | MAY_EXEC);
1502 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
1515 if (!ndip->i_inode.i_nlink) {
1519 if (ndip->i_entries == (u32)-1) {
1523 if (S_ISDIR(ip->i_inode.i_mode) &&
1524 ndip->i_inode.i_nlink == (u32)-1) {
1531 /* Check out the dir to be renamed */
1534 error = gfs2_permission(&init_user_ns, d_inode(odentry),
1541 error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da);
1547 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
1548 error = gfs2_quota_lock_check(ndip, &ap);
1552 error = gfs2_inplace_reserve(ndip, &ap);
1556 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) +
1557 4 * RES_LEAF + 4, 0);
1561 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
1562 5 * RES_LEAF + 4, 0);
1567 /* Remove the target file, if it exists */
1570 error = gfs2_unlink_inode(ndip, ndentry);
1572 error = update_moved_ino(ip, ndip, dir_rename);
1576 error = gfs2_dir_del(odip, odentry);
1580 error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da);
1585 gfs2_trans_end(sdp);
1588 gfs2_inplace_release(ndip);
1591 gfs2_quota_unlock(ndip);
1593 gfs2_dir_no_add(&da);
1594 if (gfs2_holder_initialized(&rd_gh))
1595 gfs2_glock_dq_uninit(&rd_gh);
1598 if (gfs2_holder_queued(ghs + x))
1599 gfs2_glock_dq(ghs + x);
1600 gfs2_holder_uninit(ghs + x);
1603 if (gfs2_holder_initialized(&r_gh))
1604 gfs2_glock_dq_uninit(&r_gh);
1611 * gfs2_exchange - exchange two files
1612 * @odir: Parent directory of old file name
1613 * @odentry: The old dentry of the file
1614 * @ndir: Parent directory of new file name
1615 * @ndentry: The new dentry of the file
1616 * @flags: The rename flags
1621 static int gfs2_exchange(struct inode *odir, struct dentry *odentry,
1622 struct inode *ndir, struct dentry *ndentry,
1625 struct gfs2_inode *odip = GFS2_I(odir);
1626 struct gfs2_inode *ndip = GFS2_I(ndir);
1627 struct gfs2_inode *oip = GFS2_I(odentry->d_inode);
1628 struct gfs2_inode *nip = GFS2_I(ndentry->d_inode);
1629 struct gfs2_sbd *sdp = GFS2_SB(odir);
1630 struct gfs2_holder ghs[4], r_gh;
1631 unsigned int num_gh;
1633 umode_t old_mode = oip->i_inode.i_mode;
1634 umode_t new_mode = nip->i_inode.i_mode;
1637 gfs2_holder_mark_uninitialized(&r_gh);
1638 error = gfs2_rindex_update(sdp);
1643 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1648 if (S_ISDIR(old_mode)) {
1649 /* don't move a directory into its subdir */
1650 error = gfs2_ok_to_move(oip, ndip);
1655 if (S_ISDIR(new_mode)) {
1656 /* don't move a directory into its subdir */
1657 error = gfs2_ok_to_move(nip, odip);
1664 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs);
1666 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC,
1670 gfs2_holder_init(oip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh);
1673 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh);
1676 for (x = 0; x < num_gh; x++) {
1677 error = gfs2_glock_nq(ghs + x);
1682 error = gfs2_glock_async_wait(num_gh, ghs);
1687 if (oip->i_inode.i_nlink == 0 || nip->i_inode.i_nlink == 0)
1690 error = gfs2_unlink_ok(odip, &odentry->d_name, oip);
1693 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1697 if (S_ISDIR(old_mode)) {
1698 error = gfs2_permission(&init_user_ns, odentry->d_inode,
1703 if (S_ISDIR(new_mode)) {
1704 error = gfs2_permission(&init_user_ns, ndentry->d_inode,
1709 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 4 * RES_LEAF, 0);
1713 error = update_moved_ino(oip, ndip, S_ISDIR(old_mode));
1717 error = update_moved_ino(nip, odip, S_ISDIR(new_mode));
1721 error = gfs2_dir_mvino(ndip, &ndentry->d_name, oip,
1726 error = gfs2_dir_mvino(odip, &odentry->d_name, nip,
1732 if (S_ISDIR(new_mode) && !S_ISDIR(old_mode)) {
1733 inc_nlink(&odip->i_inode);
1734 drop_nlink(&ndip->i_inode);
1735 } else if (S_ISDIR(old_mode) && !S_ISDIR(new_mode)) {
1736 inc_nlink(&ndip->i_inode);
1737 drop_nlink(&odip->i_inode);
1740 mark_inode_dirty(&ndip->i_inode);
1742 mark_inode_dirty(&odip->i_inode);
1745 gfs2_trans_end(sdp);
1748 if (gfs2_holder_queued(ghs + x))
1749 gfs2_glock_dq(ghs + x);
1750 gfs2_holder_uninit(ghs + x);
1753 if (gfs2_holder_initialized(&r_gh))
1754 gfs2_glock_dq_uninit(&r_gh);
1759 static int gfs2_rename2(struct user_namespace *mnt_userns, struct inode *odir,
1760 struct dentry *odentry, struct inode *ndir,
1761 struct dentry *ndentry, unsigned int flags)
1763 flags &= ~RENAME_NOREPLACE;
1765 if (flags & ~RENAME_EXCHANGE)
1768 if (flags & RENAME_EXCHANGE)
1769 return gfs2_exchange(odir, odentry, ndir, ndentry, flags);
1771 return gfs2_rename(odir, odentry, ndir, ndentry);
1775 * gfs2_get_link - Follow a symbolic link
1776 * @dentry: The dentry of the link
1777 * @inode: The inode of the link
1778 * @done: destructor for return value
1780 * This can handle symlinks of any size.
1782 * Returns: 0 on success or error code
1785 static const char *gfs2_get_link(struct dentry *dentry,
1786 struct inode *inode,
1787 struct delayed_call *done)
1789 struct gfs2_inode *ip = GFS2_I(inode);
1790 struct gfs2_holder i_gh;
1791 struct buffer_head *dibh;
1797 return ERR_PTR(-ECHILD);
1799 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1800 error = gfs2_glock_nq(&i_gh);
1802 gfs2_holder_uninit(&i_gh);
1803 return ERR_PTR(error);
1806 size = (unsigned int)i_size_read(&ip->i_inode);
1808 gfs2_consist_inode(ip);
1809 buf = ERR_PTR(-EIO);
1813 error = gfs2_meta_inode_buffer(ip, &dibh);
1815 buf = ERR_PTR(error);
1819 buf = kzalloc(size + 1, GFP_NOFS);
1821 buf = ERR_PTR(-ENOMEM);
1823 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
1826 gfs2_glock_dq_uninit(&i_gh);
1828 set_delayed_call(done, kfree_link, buf);
1834 * @mnt_userns: User namespace of the mount the inode was found from
1836 * @mask: The mask to be tested
1838 * This may be called from the VFS directly, or from within GFS2 with the
1839 * inode locked, so we look to see if the glock is already locked and only
1840 * lock the glock if its not already been done.
1845 int gfs2_permission(struct user_namespace *mnt_userns, struct inode *inode,
1848 struct gfs2_inode *ip;
1849 struct gfs2_holder i_gh;
1852 gfs2_holder_mark_uninitialized(&i_gh);
1854 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1855 if (mask & MAY_NOT_BLOCK)
1857 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1862 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1865 error = generic_permission(&init_user_ns, inode, mask);
1866 if (gfs2_holder_initialized(&i_gh))
1867 gfs2_glock_dq_uninit(&i_gh);
1872 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1874 setattr_copy(&init_user_ns, inode, attr);
1875 mark_inode_dirty(inode);
1879 static int gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1883 if (current->journal_info)
1884 return __gfs2_setattr_simple(inode, attr);
1886 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0);
1890 error = __gfs2_setattr_simple(inode, attr);
1891 gfs2_trans_end(GFS2_SB(inode));
1895 static int setattr_chown(struct inode *inode, struct iattr *attr)
1897 struct gfs2_inode *ip = GFS2_I(inode);
1898 struct gfs2_sbd *sdp = GFS2_SB(inode);
1902 struct gfs2_alloc_parms ap;
1904 ouid = inode->i_uid;
1905 ogid = inode->i_gid;
1906 nuid = attr->ia_uid;
1907 ngid = attr->ia_gid;
1909 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid))
1910 ouid = nuid = NO_UID_QUOTA_CHANGE;
1911 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid))
1912 ogid = ngid = NO_GID_QUOTA_CHANGE;
1913 error = gfs2_qa_get(ip);
1917 error = gfs2_rindex_update(sdp);
1921 error = gfs2_quota_lock(ip, nuid, ngid);
1925 ap.target = gfs2_get_inode_blocks(&ip->i_inode);
1927 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1928 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1929 error = gfs2_quota_check(ip, nuid, ngid, &ap);
1934 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1938 error = gfs2_setattr_simple(inode, attr);
1942 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1943 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1944 gfs2_quota_change(ip, -(s64)ap.target, ouid, ogid);
1945 gfs2_quota_change(ip, ap.target, nuid, ngid);
1949 gfs2_trans_end(sdp);
1951 gfs2_quota_unlock(ip);
1958 * gfs2_setattr - Change attributes on an inode
1959 * @mnt_userns: User namespace of the mount the inode was found from
1960 * @dentry: The dentry which is changing
1961 * @attr: The structure describing the change
1963 * The VFS layer wants to change one or more of an inodes attributes. Write
1964 * that change out to disk.
1969 static int gfs2_setattr(struct user_namespace *mnt_userns,
1970 struct dentry *dentry, struct iattr *attr)
1972 struct inode *inode = d_inode(dentry);
1973 struct gfs2_inode *ip = GFS2_I(inode);
1974 struct gfs2_holder i_gh;
1977 error = gfs2_qa_get(ip);
1981 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1985 error = may_setattr(&init_user_ns, inode, attr->ia_valid);
1989 error = setattr_prepare(&init_user_ns, dentry, attr);
1993 if (attr->ia_valid & ATTR_SIZE)
1994 error = gfs2_setattr_size(inode, attr->ia_size);
1995 else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1996 error = setattr_chown(inode, attr);
1998 error = gfs2_setattr_simple(inode, attr);
1999 if (!error && attr->ia_valid & ATTR_MODE)
2000 error = posix_acl_chmod(&init_user_ns, inode,
2006 mark_inode_dirty(inode);
2007 gfs2_glock_dq_uninit(&i_gh);
2014 * gfs2_getattr - Read out an inode's attributes
2015 * @mnt_userns: user namespace of the mount the inode was found from
2016 * @path: Object to query
2017 * @stat: The inode's stats
2018 * @request_mask: Mask of STATX_xxx flags indicating the caller's interests
2019 * @flags: AT_STATX_xxx setting
2021 * This may be called from the VFS directly, or from within GFS2 with the
2022 * inode locked, so we look to see if the glock is already locked and only
2023 * lock the glock if its not already been done. Note that its the NFS
2024 * readdirplus operation which causes this to be called (from filldir)
2025 * with the glock already held.
2030 static int gfs2_getattr(struct user_namespace *mnt_userns,
2031 const struct path *path, struct kstat *stat,
2032 u32 request_mask, unsigned int flags)
2034 struct inode *inode = d_inode(path->dentry);
2035 struct gfs2_inode *ip = GFS2_I(inode);
2036 struct gfs2_holder gh;
2040 gfs2_holder_mark_uninitialized(&gh);
2041 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
2042 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
2047 gfsflags = ip->i_diskflags;
2048 if (gfsflags & GFS2_DIF_APPENDONLY)
2049 stat->attributes |= STATX_ATTR_APPEND;
2050 if (gfsflags & GFS2_DIF_IMMUTABLE)
2051 stat->attributes |= STATX_ATTR_IMMUTABLE;
2053 stat->attributes_mask |= (STATX_ATTR_APPEND |
2054 STATX_ATTR_COMPRESSED |
2055 STATX_ATTR_ENCRYPTED |
2056 STATX_ATTR_IMMUTABLE |
2059 generic_fillattr(&init_user_ns, inode, stat);
2061 if (gfs2_holder_initialized(&gh))
2062 gfs2_glock_dq_uninit(&gh);
2067 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
2070 struct gfs2_inode *ip = GFS2_I(inode);
2071 struct gfs2_holder gh;
2074 inode_lock_shared(inode);
2076 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2080 ret = iomap_fiemap(inode, fieinfo, start, len, &gfs2_iomap_ops);
2082 gfs2_glock_dq_uninit(&gh);
2085 inode_unlock_shared(inode);
2089 loff_t gfs2_seek_data(struct file *file, loff_t offset)
2091 struct inode *inode = file->f_mapping->host;
2092 struct gfs2_inode *ip = GFS2_I(inode);
2093 struct gfs2_holder gh;
2096 inode_lock_shared(inode);
2097 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2099 ret = iomap_seek_data(inode, offset, &gfs2_iomap_ops);
2100 gfs2_glock_dq_uninit(&gh);
2101 inode_unlock_shared(inode);
2105 return vfs_setpos(file, ret, inode->i_sb->s_maxbytes);
2108 loff_t gfs2_seek_hole(struct file *file, loff_t offset)
2110 struct inode *inode = file->f_mapping->host;
2111 struct gfs2_inode *ip = GFS2_I(inode);
2112 struct gfs2_holder gh;
2115 inode_lock_shared(inode);
2116 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2118 ret = iomap_seek_hole(inode, offset, &gfs2_iomap_ops);
2119 gfs2_glock_dq_uninit(&gh);
2120 inode_unlock_shared(inode);
2124 return vfs_setpos(file, ret, inode->i_sb->s_maxbytes);
2127 static int gfs2_update_time(struct inode *inode, struct timespec64 *time,
2130 struct gfs2_inode *ip = GFS2_I(inode);
2131 struct gfs2_glock *gl = ip->i_gl;
2132 struct gfs2_holder *gh;
2135 gh = gfs2_glock_is_locked_by_me(gl);
2136 if (gh && !gfs2_glock_is_held_excl(gl)) {
2138 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, gh);
2139 error = gfs2_glock_nq(gh);
2143 return generic_update_time(inode, time, flags);
2146 static const struct inode_operations gfs2_file_iops = {
2147 .permission = gfs2_permission,
2148 .setattr = gfs2_setattr,
2149 .getattr = gfs2_getattr,
2150 .listxattr = gfs2_listxattr,
2151 .fiemap = gfs2_fiemap,
2152 .get_acl = gfs2_get_acl,
2153 .set_acl = gfs2_set_acl,
2154 .update_time = gfs2_update_time,
2155 .fileattr_get = gfs2_fileattr_get,
2156 .fileattr_set = gfs2_fileattr_set,
2159 static const struct inode_operations gfs2_dir_iops = {
2160 .create = gfs2_create,
2161 .lookup = gfs2_lookup,
2163 .unlink = gfs2_unlink,
2164 .symlink = gfs2_symlink,
2165 .mkdir = gfs2_mkdir,
2166 .rmdir = gfs2_unlink,
2167 .mknod = gfs2_mknod,
2168 .rename = gfs2_rename2,
2169 .permission = gfs2_permission,
2170 .setattr = gfs2_setattr,
2171 .getattr = gfs2_getattr,
2172 .listxattr = gfs2_listxattr,
2173 .fiemap = gfs2_fiemap,
2174 .get_acl = gfs2_get_acl,
2175 .set_acl = gfs2_set_acl,
2176 .update_time = gfs2_update_time,
2177 .atomic_open = gfs2_atomic_open,
2178 .fileattr_get = gfs2_fileattr_get,
2179 .fileattr_set = gfs2_fileattr_set,
2182 static const struct inode_operations gfs2_symlink_iops = {
2183 .get_link = gfs2_get_link,
2184 .permission = gfs2_permission,
2185 .setattr = gfs2_setattr,
2186 .getattr = gfs2_getattr,
2187 .listxattr = gfs2_listxattr,
2188 .fiemap = gfs2_fiemap,