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;
134 error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
138 if (type == DT_UNKNOWN || blktype != GFS2_BLKST_FREE) {
140 * The GL_SKIP flag indicates to skip reading the inode
141 * block. We read the inode when instantiating it
142 * after possibly checking the block type.
144 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE,
151 gfs2_inode_already_deleted(ip->i_gl, no_formal_ino))
154 if (blktype != GFS2_BLKST_FREE) {
155 error = gfs2_check_blk_type(sdp, no_addr,
162 set_bit(GLF_INSTANTIATE_NEEDED, &ip->i_gl->gl_flags);
164 error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
167 if (blktype != GFS2_BLKST_UNLINKED)
168 gfs2_cancel_delete_work(io_gl);
169 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
170 gfs2_glock_put(io_gl);
174 /* Lowest possible timestamp; will be overwritten in gfs2_dinode_in. */
175 inode->i_atime.tv_sec = 1LL << (8 * sizeof(inode->i_atime.tv_sec) - 1);
176 inode->i_atime.tv_nsec = 0;
178 glock_set_object(ip->i_gl, ip);
180 if (type == DT_UNKNOWN) {
181 /* Inode glock must be locked already */
182 error = gfs2_instantiate(&i_gh);
184 glock_clear_object(ip->i_gl, ip);
188 ip->i_no_formal_ino = no_formal_ino;
189 inode->i_mode = DT2IF(type);
192 if (gfs2_holder_initialized(&i_gh))
193 gfs2_glock_dq_uninit(&i_gh);
194 glock_set_object(ip->i_iopen_gh.gh_gl, ip);
197 unlock_new_inode(inode);
200 if (no_formal_ino && ip->i_no_formal_ino &&
201 no_formal_ino != ip->i_no_formal_ino) {
203 return ERR_PTR(-ESTALE);
209 if (gfs2_holder_initialized(&ip->i_iopen_gh))
210 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
211 if (gfs2_holder_initialized(&i_gh))
212 gfs2_glock_dq_uninit(&i_gh);
214 return ERR_PTR(error);
218 * gfs2_lookup_by_inum - look up an inode by inode number
219 * @sdp: The super block
220 * @no_addr: The inode number
221 * @no_formal_ino: The inode generation number (0 for any)
222 * @blktype: Requested block type (see gfs2_inode_lookup)
224 struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr,
225 u64 no_formal_ino, unsigned int blktype)
227 struct super_block *sb = sdp->sd_vfs;
231 inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, no_formal_ino,
238 if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM)
245 return ERR_PTR(error);
249 struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
253 gfs2_str2qstr(&qstr, name);
254 inode = gfs2_lookupi(dip, &qstr, 1);
255 /* gfs2_lookupi has inconsistent callers: vfs
256 * related routines expect NULL for no entry found,
257 * gfs2_lookup_simple callers expect ENOENT
258 * and do not check for NULL.
261 return ERR_PTR(-ENOENT);
268 * gfs2_lookupi - Look up a filename in a directory and return its inode
269 * @dir: The inode of the directory containing the inode to look-up
270 * @name: The name of the inode to look for
271 * @is_root: If 1, ignore the caller's permissions
273 * This can be called via the VFS filldir function when NFS is doing
274 * a readdirplus and the inode which its intending to stat isn't
275 * already in cache. In this case we must not take the directory glock
276 * again, since the readdir call will have already taken that lock.
281 struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
284 struct super_block *sb = dir->i_sb;
285 struct gfs2_inode *dip = GFS2_I(dir);
286 struct gfs2_holder d_gh;
288 struct inode *inode = NULL;
290 gfs2_holder_mark_uninitialized(&d_gh);
291 if (!name->len || name->len > GFS2_FNAMESIZE)
292 return ERR_PTR(-ENAMETOOLONG);
294 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
295 (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
296 dir == d_inode(sb->s_root))) {
301 if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) {
302 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
304 return ERR_PTR(error);
308 error = gfs2_permission(&init_user_ns, dir, MAY_EXEC);
313 inode = gfs2_dir_search(dir, name, false);
315 error = PTR_ERR(inode);
317 if (gfs2_holder_initialized(&d_gh))
318 gfs2_glock_dq_uninit(&d_gh);
319 if (error == -ENOENT)
321 return inode ? inode : ERR_PTR(error);
325 * create_ok - OK to create a new on-disk inode here?
326 * @dip: Directory in which dinode is to be created
327 * @name: Name of new dinode
333 static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
338 error = gfs2_permission(&init_user_ns, &dip->i_inode,
339 MAY_WRITE | MAY_EXEC);
343 /* Don't create entries in an unlinked directory */
344 if (!dip->i_inode.i_nlink)
347 if (dip->i_entries == (u32)-1)
349 if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1)
355 static void munge_mode_uid_gid(const struct gfs2_inode *dip,
358 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
359 (dip->i_inode.i_mode & S_ISUID) &&
360 !uid_eq(dip->i_inode.i_uid, GLOBAL_ROOT_UID)) {
361 if (S_ISDIR(inode->i_mode))
362 inode->i_mode |= S_ISUID;
363 else if (!uid_eq(dip->i_inode.i_uid, current_fsuid()))
364 inode->i_mode &= ~07111;
365 inode->i_uid = dip->i_inode.i_uid;
367 inode->i_uid = current_fsuid();
369 if (dip->i_inode.i_mode & S_ISGID) {
370 if (S_ISDIR(inode->i_mode))
371 inode->i_mode |= S_ISGID;
372 inode->i_gid = dip->i_inode.i_gid;
374 inode->i_gid = current_fsgid();
377 static int alloc_dinode(struct gfs2_inode *ip, u32 flags, unsigned *dblocks)
379 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
380 struct gfs2_alloc_parms ap = { .target = *dblocks, .aflags = flags, };
383 error = gfs2_quota_lock_check(ip, &ap);
387 error = gfs2_inplace_reserve(ip, &ap);
391 error = gfs2_trans_begin(sdp, (*dblocks * RES_RG_BIT) + RES_STATFS + RES_QUOTA, 0);
395 error = gfs2_alloc_blocks(ip, &ip->i_no_addr, dblocks, 1, &ip->i_generation);
396 ip->i_no_formal_ino = ip->i_generation;
397 ip->i_inode.i_ino = ip->i_no_addr;
398 ip->i_goal = ip->i_no_addr;
403 gfs2_inplace_release(ip);
405 gfs2_quota_unlock(ip);
410 static void gfs2_init_dir(struct buffer_head *dibh,
411 const struct gfs2_inode *parent)
413 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
414 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
416 gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent);
417 dent->de_inum = di->di_num; /* already GFS2 endian */
418 dent->de_type = cpu_to_be16(DT_DIR);
420 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
421 gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
422 gfs2_inum_out(parent, dent);
423 dent->de_type = cpu_to_be16(DT_DIR);
428 * gfs2_init_xattr - Initialise an xattr block for a new inode
429 * @ip: The inode in question
431 * This sets up an empty xattr block for a new inode, ready to
432 * take any ACLs, LSM xattrs, etc.
435 static void gfs2_init_xattr(struct gfs2_inode *ip)
437 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
438 struct buffer_head *bh;
439 struct gfs2_ea_header *ea;
441 bh = gfs2_meta_new(ip->i_gl, ip->i_eattr);
442 gfs2_trans_add_meta(ip->i_gl, bh);
443 gfs2_metatype_set(bh, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
444 gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header));
446 ea = GFS2_EA_BH2FIRST(bh);
447 ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
448 ea->ea_type = GFS2_EATYPE_UNUSED;
449 ea->ea_flags = GFS2_EAFLAG_LAST;
455 * init_dinode - Fill in a new dinode structure
456 * @dip: The directory this inode is being created in
458 * @symname: The symlink destination (if a symlink)
462 static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip,
465 struct gfs2_dinode *di;
466 struct buffer_head *dibh;
468 dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr);
469 gfs2_trans_add_meta(ip->i_gl, dibh);
470 di = (struct gfs2_dinode *)dibh->b_data;
471 gfs2_dinode_out(ip, di);
473 di->di_major = cpu_to_be32(imajor(&ip->i_inode));
474 di->di_minor = cpu_to_be32(iminor(&ip->i_inode));
478 memset(&di->__pad4, 0, sizeof(di->__pad4));
479 memset(&di->di_reserved, 0, sizeof(di->di_reserved));
480 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
482 switch(ip->i_inode.i_mode & S_IFMT) {
484 gfs2_init_dir(dibh, dip);
487 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size);
491 set_buffer_uptodate(dibh);
496 * gfs2_trans_da_blks - Calculate number of blocks to link inode
497 * @dip: The directory we are linking into
498 * @da: The dir add information
499 * @nr_inodes: The number of inodes involved
501 * This calculate the number of blocks we need to reserve in a
502 * transaction to link @nr_inodes into a directory. In most cases
503 * @nr_inodes will be 2 (the directory plus the inode being linked in)
504 * but in case of rename, 4 may be required.
506 * Returns: Number of blocks
509 static unsigned gfs2_trans_da_blks(const struct gfs2_inode *dip,
510 const struct gfs2_diradd *da,
513 return da->nr_blocks + gfs2_rg_blocks(dip, da->nr_blocks) +
514 (nr_inodes * RES_DINODE) + RES_QUOTA + RES_STATFS;
517 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
518 struct gfs2_inode *ip, struct gfs2_diradd *da)
520 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
521 struct gfs2_alloc_parms ap = { .target = da->nr_blocks, };
525 error = gfs2_quota_lock_check(dip, &ap);
527 goto fail_quota_locks;
529 error = gfs2_inplace_reserve(dip, &ap);
531 goto fail_quota_locks;
533 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, da, 2), 0);
537 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
539 goto fail_quota_locks;
542 error = gfs2_dir_add(&dip->i_inode, name, ip, da);
546 gfs2_inplace_release(dip);
548 gfs2_quota_unlock(dip);
552 static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
555 const struct xattr *xattr;
558 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
559 err = __gfs2_xattr_set(inode, xattr->name, xattr->value,
561 GFS2_EATYPE_SECURITY);
569 * gfs2_create_inode - Create a new inode
570 * @dir: The parent directory
571 * @dentry: The new dentry
572 * @file: If non-NULL, the file which is being opened
573 * @mode: The permissions on the new inode
574 * @dev: For device nodes, this is the device number
575 * @symname: For symlinks, this is the link destination
576 * @size: The initial size of the inode (ignored for directories)
577 * @excl: Force fail if inode exists
579 * Returns: 0 on success, or error code
582 static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
584 umode_t mode, dev_t dev, const char *symname,
585 unsigned int size, int excl)
587 const struct qstr *name = &dentry->d_name;
588 struct posix_acl *default_acl, *acl;
589 struct gfs2_holder ghs[2];
590 struct inode *inode = NULL;
591 struct gfs2_inode *dip = GFS2_I(dir), *ip;
592 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
593 struct gfs2_glock *io_gl;
594 int error, free_vfs_inode = 1;
597 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
599 if (!name->len || name->len > GFS2_FNAMESIZE)
600 return -ENAMETOOLONG;
602 error = gfs2_qa_get(dip);
606 error = gfs2_rindex_update(sdp);
610 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
613 gfs2_holder_mark_uninitialized(ghs + 1);
615 error = create_ok(dip, name, mode);
619 inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl);
620 error = PTR_ERR(inode);
621 if (!IS_ERR(inode)) {
622 if (S_ISDIR(inode->i_mode)) {
624 inode = ERR_PTR(-EISDIR);
627 d_instantiate(dentry, inode);
630 if (S_ISREG(inode->i_mode))
631 error = finish_open(file, dentry, gfs2_open_common);
633 error = finish_no_open(file, NULL);
635 gfs2_glock_dq_uninit(ghs);
637 } else if (error != -ENOENT) {
641 error = gfs2_diradd_alloc_required(dir, name, &da);
645 inode = new_inode(sdp->sd_vfs);
650 error = posix_acl_create(dir, &mode, &default_acl, &acl);
655 error = gfs2_qa_get(ip);
659 inode->i_mode = mode;
660 set_nlink(inode, S_ISDIR(mode) ? 2 : 1);
662 inode->i_size = size;
663 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
664 munge_mode_uid_gid(dip, inode);
665 check_and_update_goal(dip);
666 ip->i_goal = dip->i_goal;
672 ip->i_no_addr = 0; /* Temporarily zero until real addr is assigned */
674 switch(mode & S_IFMT) {
676 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) ||
677 gfs2_tune_get(sdp, gt_new_files_jdata))
678 ip->i_diskflags |= GFS2_DIF_JDATA;
679 gfs2_set_aops(inode);
682 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA);
683 ip->i_diskflags |= GFS2_DIF_JDATA;
688 /* Force SYSTEM flag on all files and subdirs of a SYSTEM directory */
689 if (dip->i_diskflags & GFS2_DIF_SYSTEM)
690 ip->i_diskflags |= GFS2_DIF_SYSTEM;
692 gfs2_set_inode_flags(inode);
694 if ((GFS2_I(d_inode(sdp->sd_root_dir)) == dip) ||
695 (dip->i_diskflags & GFS2_DIF_TOPDIR))
696 aflags |= GFS2_AF_ORLOV;
698 if (default_acl || acl)
701 error = alloc_dinode(ip, aflags, &blocks);
703 goto fail_free_inode;
705 gfs2_set_inode_blocks(inode, blocks);
707 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
709 goto fail_free_inode;
711 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
713 goto fail_free_inode;
714 gfs2_cancel_delete_work(io_gl);
716 error = insert_inode_locked4(inode, ip->i_no_addr, iget_test, &ip->i_no_addr);
719 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
723 error = gfs2_trans_begin(sdp, blocks, 0);
728 ip->i_eattr = ip->i_no_addr + 1;
731 init_dinode(dip, ip, symname);
734 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
738 glock_set_object(ip->i_gl, ip);
739 glock_set_object(io_gl, ip);
742 free_vfs_inode = 0; /* After this point, the inode is no longer
743 considered free. Any failures need to undo
744 the gfs2 structures. */
746 error = __gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
749 posix_acl_release(default_acl);
753 error = __gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS);
756 posix_acl_release(acl);
760 error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name,
761 &gfs2_initxattrs, NULL);
765 error = link_dinode(dip, name, ip, &da);
769 mark_inode_dirty(inode);
770 d_instantiate(dentry, inode);
771 /* After instantiate, errors should result in evict which will destroy
772 * both inode and iopen glocks properly. */
774 file->f_mode |= FMODE_CREATED;
775 error = finish_open(file, dentry, gfs2_open_common);
777 gfs2_glock_dq_uninit(ghs);
779 gfs2_glock_dq_uninit(ghs + 1);
780 gfs2_glock_put(io_gl);
782 unlock_new_inode(inode);
786 glock_clear_object(ip->i_gl, ip);
787 glock_clear_object(io_gl, ip);
788 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
790 gfs2_glock_put(io_gl);
793 if (free_vfs_inode) /* else evict will do the put for us */
794 gfs2_glock_put(ip->i_gl);
796 gfs2_rs_delete(ip, NULL);
799 posix_acl_release(default_acl);
800 posix_acl_release(acl);
802 gfs2_dir_no_add(&da);
803 gfs2_glock_dq_uninit(ghs);
804 if (!IS_ERR_OR_NULL(inode)) {
807 mark_inode_dirty(inode);
808 set_bit(free_vfs_inode ? GIF_FREE_VFS_INODE : GIF_ALLOC_FAILED,
809 &GFS2_I(inode)->i_flags);
810 if (inode->i_state & I_NEW)
815 if (gfs2_holder_initialized(ghs + 1))
816 gfs2_glock_dq_uninit(ghs + 1);
823 * gfs2_create - Create a file
824 * @mnt_userns: User namespace of the mount the inode was found from
825 * @dir: The directory in which to create the file
826 * @dentry: The dentry of the new file
827 * @mode: The mode of the new file
828 * @excl: Force fail if inode exists
833 static int gfs2_create(struct user_namespace *mnt_userns, struct inode *dir,
834 struct dentry *dentry, umode_t mode, bool excl)
836 return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl);
840 * __gfs2_lookup - Look up a filename in a directory and return its inode
841 * @dir: The directory inode
842 * @dentry: The dentry of the new inode
843 * @file: File to be opened
849 static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry,
854 struct gfs2_holder gh;
855 struct gfs2_glock *gl;
858 inode = gfs2_lookupi(dir, &dentry->d_name, 0);
864 return ERR_CAST(inode);
866 gl = GFS2_I(inode)->i_gl;
867 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
870 return ERR_PTR(error);
873 d = d_splice_alias(inode, dentry);
875 gfs2_glock_dq_uninit(&gh);
878 if (file && S_ISREG(inode->i_mode))
879 error = finish_open(file, dentry, gfs2_open_common);
881 gfs2_glock_dq_uninit(&gh);
884 return ERR_PTR(error);
889 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
892 return __gfs2_lookup(dir, dentry, NULL);
896 * gfs2_link - Link to a file
897 * @old_dentry: The inode to link
898 * @dir: Add link to this directory
899 * @dentry: The name of the link
901 * Link the inode in "old_dentry" into the directory "dir" with the
907 static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
908 struct dentry *dentry)
910 struct gfs2_inode *dip = GFS2_I(dir);
911 struct gfs2_sbd *sdp = GFS2_SB(dir);
912 struct inode *inode = d_inode(old_dentry);
913 struct gfs2_inode *ip = GFS2_I(inode);
914 struct gfs2_holder ghs[2];
915 struct buffer_head *dibh;
916 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
919 if (S_ISDIR(inode->i_mode))
922 error = gfs2_qa_get(dip);
926 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
927 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
929 error = gfs2_glock_nq(ghs); /* parent */
933 error = gfs2_glock_nq(ghs + 1); /* child */
938 if (inode->i_nlink == 0)
941 error = gfs2_permission(&init_user_ns, dir, MAY_WRITE | MAY_EXEC);
945 error = gfs2_dir_check(dir, &dentry->d_name, NULL);
957 if (!dip->i_inode.i_nlink)
960 if (dip->i_entries == (u32)-1)
963 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
966 if (!ip->i_inode.i_nlink)
969 if (ip->i_inode.i_nlink == (u32)-1)
972 error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da);
977 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
978 error = gfs2_quota_lock_check(dip, &ap);
982 error = gfs2_inplace_reserve(dip, &ap);
986 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0);
990 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
995 error = gfs2_meta_inode_buffer(ip, &dibh);
999 error = gfs2_dir_add(dir, &dentry->d_name, ip, &da);
1003 gfs2_trans_add_meta(ip->i_gl, dibh);
1004 inc_nlink(&ip->i_inode);
1005 ip->i_inode.i_ctime = current_time(&ip->i_inode);
1007 d_instantiate(dentry, inode);
1008 mark_inode_dirty(inode);
1013 gfs2_trans_end(sdp);
1016 gfs2_inplace_release(dip);
1019 gfs2_quota_unlock(dip);
1021 gfs2_dir_no_add(&da);
1022 gfs2_glock_dq(ghs + 1);
1027 gfs2_holder_uninit(ghs);
1028 gfs2_holder_uninit(ghs + 1);
1033 * gfs2_unlink_ok - check to see that a inode is still in a directory
1034 * @dip: the directory
1035 * @name: the name of the file
1038 * Assumes that the lock on (at least) @dip is held.
1040 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
1043 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
1044 const struct gfs2_inode *ip)
1048 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
1051 if ((dip->i_inode.i_mode & S_ISVTX) &&
1052 !uid_eq(dip->i_inode.i_uid, current_fsuid()) &&
1053 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER))
1056 if (IS_APPEND(&dip->i_inode))
1059 error = gfs2_permission(&init_user_ns, &dip->i_inode,
1060 MAY_WRITE | MAY_EXEC);
1064 return gfs2_dir_check(&dip->i_inode, name, ip);
1068 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it
1069 * @dip: The parent directory
1070 * @dentry: The dentry to unlink
1072 * Called with all the locks and in a transaction. This will only be
1073 * called for a directory after it has been checked to ensure it is empty.
1075 * Returns: 0 on success, or an error
1078 static int gfs2_unlink_inode(struct gfs2_inode *dip,
1079 const struct dentry *dentry)
1081 struct inode *inode = d_inode(dentry);
1082 struct gfs2_inode *ip = GFS2_I(inode);
1085 error = gfs2_dir_del(dip, dentry);
1090 inode->i_ctime = current_time(inode);
1091 if (S_ISDIR(inode->i_mode))
1095 mark_inode_dirty(inode);
1096 if (inode->i_nlink == 0)
1097 gfs2_unlink_di(inode);
1103 * gfs2_unlink - Unlink an inode (this does rmdir as well)
1104 * @dir: The inode of the directory containing the inode to unlink
1105 * @dentry: The file itself
1107 * This routine uses the type of the inode as a flag to figure out
1108 * whether this is an unlink or an rmdir.
1113 static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
1115 struct gfs2_inode *dip = GFS2_I(dir);
1116 struct gfs2_sbd *sdp = GFS2_SB(dir);
1117 struct inode *inode = d_inode(dentry);
1118 struct gfs2_inode *ip = GFS2_I(inode);
1119 struct gfs2_holder ghs[3];
1120 struct gfs2_rgrpd *rgd;
1123 error = gfs2_rindex_update(sdp);
1129 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1130 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
1132 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1136 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, LM_FLAG_NODE_SCOPE, ghs + 2);
1139 error = gfs2_glock_nq(ghs); /* parent */
1143 error = gfs2_glock_nq(ghs + 1); /* child */
1148 if (inode->i_nlink == 0)
1151 if (S_ISDIR(inode->i_mode)) {
1153 if (ip->i_entries > 2 || inode->i_nlink > 2)
1157 error = gfs2_glock_nq(ghs + 2); /* rgrp */
1161 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
1165 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0);
1169 error = gfs2_unlink_inode(dip, dentry);
1170 gfs2_trans_end(sdp);
1173 gfs2_glock_dq(ghs + 2);
1175 gfs2_glock_dq(ghs + 1);
1179 gfs2_holder_uninit(ghs + 2);
1181 gfs2_holder_uninit(ghs + 1);
1182 gfs2_holder_uninit(ghs);
1187 * gfs2_symlink - Create a symlink
1188 * @mnt_userns: User namespace of the mount the inode was found from
1189 * @dir: The directory to create the symlink in
1190 * @dentry: The dentry to put the symlink in
1191 * @symname: The thing which the link points to
1196 static int gfs2_symlink(struct user_namespace *mnt_userns, struct inode *dir,
1197 struct dentry *dentry, const char *symname)
1201 size = strlen(symname);
1202 if (size >= gfs2_max_stuffed_size(GFS2_I(dir)))
1203 return -ENAMETOOLONG;
1205 return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0);
1209 * gfs2_mkdir - Make a directory
1210 * @mnt_userns: User namespace of the mount the inode was found from
1211 * @dir: The parent directory of the new one
1212 * @dentry: The dentry of the new directory
1213 * @mode: The mode of the new directory
1218 static int gfs2_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
1219 struct dentry *dentry, umode_t mode)
1221 unsigned dsize = gfs2_max_stuffed_size(GFS2_I(dir));
1222 return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0);
1226 * gfs2_mknod - Make a special file
1227 * @mnt_userns: User namespace of the mount the inode was found from
1228 * @dir: The directory in which the special file will reside
1229 * @dentry: The dentry of the special file
1230 * @mode: The mode of the special file
1231 * @dev: The device specification of the special file
1235 static int gfs2_mknod(struct user_namespace *mnt_userns, struct inode *dir,
1236 struct dentry *dentry, umode_t mode, dev_t dev)
1238 return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0);
1242 * gfs2_atomic_open - Atomically open a file
1243 * @dir: The directory
1244 * @dentry: The proposed new entry
1245 * @file: The proposed new struct file
1246 * @flags: open flags
1249 * Returns: error code or 0 for success
1252 static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry,
1253 struct file *file, unsigned flags,
1257 bool excl = !!(flags & O_EXCL);
1259 if (!d_in_lookup(dentry))
1262 d = __gfs2_lookup(dir, dentry, file);
1267 if (d_really_is_positive(dentry)) {
1268 if (!(file->f_mode & FMODE_OPENED))
1269 return finish_no_open(file, d);
1271 return excl && (flags & O_CREAT) ? -EEXIST : 0;
1277 if (!(flags & O_CREAT))
1280 return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl);
1284 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1288 * Follow @to back to the root and make sure we don't encounter @this
1289 * Assumes we already hold the rename lock.
1294 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1296 struct inode *dir = &to->i_inode;
1297 struct super_block *sb = dir->i_sb;
1304 if (dir == &this->i_inode) {
1308 if (dir == d_inode(sb->s_root)) {
1313 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
1319 error = PTR_ERR(tmp);
1333 * update_moved_ino - Update an inode that's being moved
1334 * @ip: The inode being moved
1335 * @ndip: The parent directory of the new filename
1336 * @dir_rename: True of ip is a directory
1341 static int update_moved_ino(struct gfs2_inode *ip, struct gfs2_inode *ndip,
1345 return gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);
1347 ip->i_inode.i_ctime = current_time(&ip->i_inode);
1348 mark_inode_dirty_sync(&ip->i_inode);
1354 * gfs2_rename - Rename a file
1355 * @odir: Parent directory of old file name
1356 * @odentry: The old dentry of the file
1357 * @ndir: Parent directory of new file name
1358 * @ndentry: The new dentry of the file
1363 static int gfs2_rename(struct inode *odir, struct dentry *odentry,
1364 struct inode *ndir, struct dentry *ndentry)
1366 struct gfs2_inode *odip = GFS2_I(odir);
1367 struct gfs2_inode *ndip = GFS2_I(ndir);
1368 struct gfs2_inode *ip = GFS2_I(d_inode(odentry));
1369 struct gfs2_inode *nip = NULL;
1370 struct gfs2_sbd *sdp = GFS2_SB(odir);
1371 struct gfs2_holder ghs[4], r_gh, rd_gh;
1372 struct gfs2_rgrpd *nrgd;
1373 unsigned int num_gh;
1375 struct gfs2_diradd da = { .nr_blocks = 0, .save_loc = 0, };
1379 gfs2_holder_mark_uninitialized(&r_gh);
1380 gfs2_holder_mark_uninitialized(&rd_gh);
1381 if (d_really_is_positive(ndentry)) {
1382 nip = GFS2_I(d_inode(ndentry));
1387 error = gfs2_rindex_update(sdp);
1391 error = gfs2_qa_get(ndip);
1396 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1401 if (S_ISDIR(ip->i_inode.i_mode)) {
1403 /* don't move a directory into its subdir */
1404 error = gfs2_ok_to_move(ip, ndip);
1411 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs);
1413 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE,GL_ASYNC,
1417 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh);
1421 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC,
1426 for (x = 0; x < num_gh; x++) {
1427 error = gfs2_glock_nq(ghs + x);
1431 error = gfs2_glock_async_wait(num_gh, ghs);
1436 /* Grab the resource group glock for unlink flag twiddling.
1437 * This is the case where the target dinode already exists
1438 * so we unlink before doing the rename.
1440 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1);
1445 error = gfs2_glock_nq_init(nrgd->rd_gl, LM_ST_EXCLUSIVE,
1446 LM_FLAG_NODE_SCOPE, &rd_gh);
1452 if (ip->i_inode.i_nlink == 0)
1455 /* Check out the old directory */
1457 error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
1461 /* Check out the new directory */
1464 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1468 if (nip->i_inode.i_nlink == 0) {
1473 if (S_ISDIR(nip->i_inode.i_mode)) {
1474 if (nip->i_entries < 2) {
1475 gfs2_consist_inode(nip);
1479 if (nip->i_entries > 2) {
1485 error = gfs2_permission(&init_user_ns, ndir,
1486 MAY_WRITE | MAY_EXEC);
1490 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
1503 if (!ndip->i_inode.i_nlink) {
1507 if (ndip->i_entries == (u32)-1) {
1511 if (S_ISDIR(ip->i_inode.i_mode) &&
1512 ndip->i_inode.i_nlink == (u32)-1) {
1519 /* Check out the dir to be renamed */
1522 error = gfs2_permission(&init_user_ns, d_inode(odentry),
1529 error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da);
1535 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
1536 error = gfs2_quota_lock_check(ndip, &ap);
1540 error = gfs2_inplace_reserve(ndip, &ap);
1544 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) +
1545 4 * RES_LEAF + 4, 0);
1549 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
1550 5 * RES_LEAF + 4, 0);
1555 /* Remove the target file, if it exists */
1558 error = gfs2_unlink_inode(ndip, ndentry);
1560 error = update_moved_ino(ip, ndip, dir_rename);
1564 error = gfs2_dir_del(odip, odentry);
1568 error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da);
1573 gfs2_trans_end(sdp);
1576 gfs2_inplace_release(ndip);
1579 gfs2_quota_unlock(ndip);
1581 gfs2_dir_no_add(&da);
1582 if (gfs2_holder_initialized(&rd_gh))
1583 gfs2_glock_dq_uninit(&rd_gh);
1586 if (gfs2_holder_queued(ghs + x))
1587 gfs2_glock_dq(ghs + x);
1588 gfs2_holder_uninit(ghs + x);
1591 if (gfs2_holder_initialized(&r_gh))
1592 gfs2_glock_dq_uninit(&r_gh);
1599 * gfs2_exchange - exchange two files
1600 * @odir: Parent directory of old file name
1601 * @odentry: The old dentry of the file
1602 * @ndir: Parent directory of new file name
1603 * @ndentry: The new dentry of the file
1604 * @flags: The rename flags
1609 static int gfs2_exchange(struct inode *odir, struct dentry *odentry,
1610 struct inode *ndir, struct dentry *ndentry,
1613 struct gfs2_inode *odip = GFS2_I(odir);
1614 struct gfs2_inode *ndip = GFS2_I(ndir);
1615 struct gfs2_inode *oip = GFS2_I(odentry->d_inode);
1616 struct gfs2_inode *nip = GFS2_I(ndentry->d_inode);
1617 struct gfs2_sbd *sdp = GFS2_SB(odir);
1618 struct gfs2_holder ghs[4], r_gh;
1619 unsigned int num_gh;
1621 umode_t old_mode = oip->i_inode.i_mode;
1622 umode_t new_mode = nip->i_inode.i_mode;
1625 gfs2_holder_mark_uninitialized(&r_gh);
1626 error = gfs2_rindex_update(sdp);
1631 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1636 if (S_ISDIR(old_mode)) {
1637 /* don't move a directory into its subdir */
1638 error = gfs2_ok_to_move(oip, ndip);
1643 if (S_ISDIR(new_mode)) {
1644 /* don't move a directory into its subdir */
1645 error = gfs2_ok_to_move(nip, odip);
1652 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs);
1654 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC,
1658 gfs2_holder_init(oip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh);
1661 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh);
1664 for (x = 0; x < num_gh; x++) {
1665 error = gfs2_glock_nq(ghs + x);
1670 error = gfs2_glock_async_wait(num_gh, ghs);
1675 if (oip->i_inode.i_nlink == 0 || nip->i_inode.i_nlink == 0)
1678 error = gfs2_unlink_ok(odip, &odentry->d_name, oip);
1681 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1685 if (S_ISDIR(old_mode)) {
1686 error = gfs2_permission(&init_user_ns, odentry->d_inode,
1691 if (S_ISDIR(new_mode)) {
1692 error = gfs2_permission(&init_user_ns, ndentry->d_inode,
1697 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 4 * RES_LEAF, 0);
1701 error = update_moved_ino(oip, ndip, S_ISDIR(old_mode));
1705 error = update_moved_ino(nip, odip, S_ISDIR(new_mode));
1709 error = gfs2_dir_mvino(ndip, &ndentry->d_name, oip,
1714 error = gfs2_dir_mvino(odip, &odentry->d_name, nip,
1720 if (S_ISDIR(new_mode) && !S_ISDIR(old_mode)) {
1721 inc_nlink(&odip->i_inode);
1722 drop_nlink(&ndip->i_inode);
1723 } else if (S_ISDIR(old_mode) && !S_ISDIR(new_mode)) {
1724 inc_nlink(&ndip->i_inode);
1725 drop_nlink(&odip->i_inode);
1728 mark_inode_dirty(&ndip->i_inode);
1730 mark_inode_dirty(&odip->i_inode);
1733 gfs2_trans_end(sdp);
1736 if (gfs2_holder_queued(ghs + x))
1737 gfs2_glock_dq(ghs + x);
1738 gfs2_holder_uninit(ghs + x);
1741 if (gfs2_holder_initialized(&r_gh))
1742 gfs2_glock_dq_uninit(&r_gh);
1747 static int gfs2_rename2(struct user_namespace *mnt_userns, struct inode *odir,
1748 struct dentry *odentry, struct inode *ndir,
1749 struct dentry *ndentry, unsigned int flags)
1751 flags &= ~RENAME_NOREPLACE;
1753 if (flags & ~RENAME_EXCHANGE)
1756 if (flags & RENAME_EXCHANGE)
1757 return gfs2_exchange(odir, odentry, ndir, ndentry, flags);
1759 return gfs2_rename(odir, odentry, ndir, ndentry);
1763 * gfs2_get_link - Follow a symbolic link
1764 * @dentry: The dentry of the link
1765 * @inode: The inode of the link
1766 * @done: destructor for return value
1768 * This can handle symlinks of any size.
1770 * Returns: 0 on success or error code
1773 static const char *gfs2_get_link(struct dentry *dentry,
1774 struct inode *inode,
1775 struct delayed_call *done)
1777 struct gfs2_inode *ip = GFS2_I(inode);
1778 struct gfs2_holder i_gh;
1779 struct buffer_head *dibh;
1785 return ERR_PTR(-ECHILD);
1787 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1788 error = gfs2_glock_nq(&i_gh);
1790 gfs2_holder_uninit(&i_gh);
1791 return ERR_PTR(error);
1794 size = (unsigned int)i_size_read(&ip->i_inode);
1796 gfs2_consist_inode(ip);
1797 buf = ERR_PTR(-EIO);
1801 error = gfs2_meta_inode_buffer(ip, &dibh);
1803 buf = ERR_PTR(error);
1807 buf = kzalloc(size + 1, GFP_NOFS);
1809 buf = ERR_PTR(-ENOMEM);
1811 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
1814 gfs2_glock_dq_uninit(&i_gh);
1816 set_delayed_call(done, kfree_link, buf);
1822 * @mnt_userns: User namespace of the mount the inode was found from
1824 * @mask: The mask to be tested
1826 * This may be called from the VFS directly, or from within GFS2 with the
1827 * inode locked, so we look to see if the glock is already locked and only
1828 * lock the glock if its not already been done.
1833 int gfs2_permission(struct user_namespace *mnt_userns, struct inode *inode,
1836 struct gfs2_inode *ip;
1837 struct gfs2_holder i_gh;
1840 gfs2_holder_mark_uninitialized(&i_gh);
1842 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1843 if (mask & MAY_NOT_BLOCK)
1845 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1850 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1853 error = generic_permission(&init_user_ns, inode, mask);
1854 if (gfs2_holder_initialized(&i_gh))
1855 gfs2_glock_dq_uninit(&i_gh);
1860 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1862 setattr_copy(&init_user_ns, inode, attr);
1863 mark_inode_dirty(inode);
1867 static int gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1871 if (current->journal_info)
1872 return __gfs2_setattr_simple(inode, attr);
1874 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0);
1878 error = __gfs2_setattr_simple(inode, attr);
1879 gfs2_trans_end(GFS2_SB(inode));
1883 static int setattr_chown(struct inode *inode, struct iattr *attr)
1885 struct gfs2_inode *ip = GFS2_I(inode);
1886 struct gfs2_sbd *sdp = GFS2_SB(inode);
1890 struct gfs2_alloc_parms ap;
1892 ouid = inode->i_uid;
1893 ogid = inode->i_gid;
1894 nuid = attr->ia_uid;
1895 ngid = attr->ia_gid;
1897 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid))
1898 ouid = nuid = NO_UID_QUOTA_CHANGE;
1899 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid))
1900 ogid = ngid = NO_GID_QUOTA_CHANGE;
1901 error = gfs2_qa_get(ip);
1905 error = gfs2_rindex_update(sdp);
1909 error = gfs2_quota_lock(ip, nuid, ngid);
1913 ap.target = gfs2_get_inode_blocks(&ip->i_inode);
1915 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1916 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1917 error = gfs2_quota_check(ip, nuid, ngid, &ap);
1922 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1926 error = gfs2_setattr_simple(inode, attr);
1930 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1931 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1932 gfs2_quota_change(ip, -(s64)ap.target, ouid, ogid);
1933 gfs2_quota_change(ip, ap.target, nuid, ngid);
1937 gfs2_trans_end(sdp);
1939 gfs2_quota_unlock(ip);
1946 * gfs2_setattr - Change attributes on an inode
1947 * @mnt_userns: User namespace of the mount the inode was found from
1948 * @dentry: The dentry which is changing
1949 * @attr: The structure describing the change
1951 * The VFS layer wants to change one or more of an inodes attributes. Write
1952 * that change out to disk.
1957 static int gfs2_setattr(struct user_namespace *mnt_userns,
1958 struct dentry *dentry, struct iattr *attr)
1960 struct inode *inode = d_inode(dentry);
1961 struct gfs2_inode *ip = GFS2_I(inode);
1962 struct gfs2_holder i_gh;
1965 error = gfs2_qa_get(ip);
1969 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1973 error = may_setattr(&init_user_ns, inode, attr->ia_valid);
1977 error = setattr_prepare(&init_user_ns, dentry, attr);
1981 if (attr->ia_valid & ATTR_SIZE)
1982 error = gfs2_setattr_size(inode, attr->ia_size);
1983 else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1984 error = setattr_chown(inode, attr);
1986 error = gfs2_setattr_simple(inode, attr);
1987 if (!error && attr->ia_valid & ATTR_MODE)
1988 error = posix_acl_chmod(&init_user_ns, inode,
1994 mark_inode_dirty(inode);
1995 gfs2_glock_dq_uninit(&i_gh);
2002 * gfs2_getattr - Read out an inode's attributes
2003 * @mnt_userns: user namespace of the mount the inode was found from
2004 * @path: Object to query
2005 * @stat: The inode's stats
2006 * @request_mask: Mask of STATX_xxx flags indicating the caller's interests
2007 * @flags: AT_STATX_xxx setting
2009 * This may be called from the VFS directly, or from within GFS2 with the
2010 * inode locked, so we look to see if the glock is already locked and only
2011 * lock the glock if its not already been done. Note that its the NFS
2012 * readdirplus operation which causes this to be called (from filldir)
2013 * with the glock already held.
2018 static int gfs2_getattr(struct user_namespace *mnt_userns,
2019 const struct path *path, struct kstat *stat,
2020 u32 request_mask, unsigned int flags)
2022 struct inode *inode = d_inode(path->dentry);
2023 struct gfs2_inode *ip = GFS2_I(inode);
2024 struct gfs2_holder gh;
2028 gfs2_holder_mark_uninitialized(&gh);
2029 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
2030 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
2035 gfsflags = ip->i_diskflags;
2036 if (gfsflags & GFS2_DIF_APPENDONLY)
2037 stat->attributes |= STATX_ATTR_APPEND;
2038 if (gfsflags & GFS2_DIF_IMMUTABLE)
2039 stat->attributes |= STATX_ATTR_IMMUTABLE;
2041 stat->attributes_mask |= (STATX_ATTR_APPEND |
2042 STATX_ATTR_COMPRESSED |
2043 STATX_ATTR_ENCRYPTED |
2044 STATX_ATTR_IMMUTABLE |
2047 generic_fillattr(&init_user_ns, inode, stat);
2049 if (gfs2_holder_initialized(&gh))
2050 gfs2_glock_dq_uninit(&gh);
2055 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
2058 struct gfs2_inode *ip = GFS2_I(inode);
2059 struct gfs2_holder gh;
2062 inode_lock_shared(inode);
2064 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2068 ret = iomap_fiemap(inode, fieinfo, start, len, &gfs2_iomap_ops);
2070 gfs2_glock_dq_uninit(&gh);
2073 inode_unlock_shared(inode);
2077 loff_t gfs2_seek_data(struct file *file, loff_t offset)
2079 struct inode *inode = file->f_mapping->host;
2080 struct gfs2_inode *ip = GFS2_I(inode);
2081 struct gfs2_holder gh;
2084 inode_lock_shared(inode);
2085 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2087 ret = iomap_seek_data(inode, offset, &gfs2_iomap_ops);
2088 gfs2_glock_dq_uninit(&gh);
2089 inode_unlock_shared(inode);
2093 return vfs_setpos(file, ret, inode->i_sb->s_maxbytes);
2096 loff_t gfs2_seek_hole(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_hole(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 static int gfs2_update_time(struct inode *inode, struct timespec64 *time,
2118 struct gfs2_inode *ip = GFS2_I(inode);
2119 struct gfs2_glock *gl = ip->i_gl;
2120 struct gfs2_holder *gh;
2123 gh = gfs2_glock_is_locked_by_me(gl);
2124 if (gh && !gfs2_glock_is_held_excl(gl)) {
2126 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, gh);
2127 error = gfs2_glock_nq(gh);
2131 return generic_update_time(inode, time, flags);
2134 static const struct inode_operations gfs2_file_iops = {
2135 .permission = gfs2_permission,
2136 .setattr = gfs2_setattr,
2137 .getattr = gfs2_getattr,
2138 .listxattr = gfs2_listxattr,
2139 .fiemap = gfs2_fiemap,
2140 .get_acl = gfs2_get_acl,
2141 .set_acl = gfs2_set_acl,
2142 .update_time = gfs2_update_time,
2143 .fileattr_get = gfs2_fileattr_get,
2144 .fileattr_set = gfs2_fileattr_set,
2147 static const struct inode_operations gfs2_dir_iops = {
2148 .create = gfs2_create,
2149 .lookup = gfs2_lookup,
2151 .unlink = gfs2_unlink,
2152 .symlink = gfs2_symlink,
2153 .mkdir = gfs2_mkdir,
2154 .rmdir = gfs2_unlink,
2155 .mknod = gfs2_mknod,
2156 .rename = gfs2_rename2,
2157 .permission = gfs2_permission,
2158 .setattr = gfs2_setattr,
2159 .getattr = gfs2_getattr,
2160 .listxattr = gfs2_listxattr,
2161 .fiemap = gfs2_fiemap,
2162 .get_acl = gfs2_get_acl,
2163 .set_acl = gfs2_set_acl,
2164 .update_time = gfs2_update_time,
2165 .atomic_open = gfs2_atomic_open,
2166 .fileattr_get = gfs2_fileattr_get,
2167 .fileattr_set = gfs2_fileattr_set,
2170 static const struct inode_operations gfs2_symlink_iops = {
2171 .get_link = gfs2_get_link,
2172 .permission = gfs2_permission,
2173 .setattr = gfs2_setattr,
2174 .getattr = gfs2_getattr,
2175 .listxattr = gfs2_listxattr,
2176 .fiemap = gfs2_fiemap,