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,
139 error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE,
144 if (blktype != GFS2_BLKST_UNLINKED)
145 gfs2_cancel_delete_work(io_gl);
146 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED,
149 gfs2_glock_put(io_gl);
153 if (type == DT_UNKNOWN || blktype != GFS2_BLKST_FREE) {
155 * The GL_SKIP flag indicates to skip reading the inode
156 * block. We read the inode when instantiating it
157 * after possibly checking the block type.
159 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE,
166 gfs2_inode_already_deleted(ip->i_gl, no_formal_ino))
169 if (blktype != GFS2_BLKST_FREE) {
170 error = gfs2_check_blk_type(sdp, no_addr,
177 set_bit(GLF_INSTANTIATE_NEEDED, &ip->i_gl->gl_flags);
179 /* Lowest possible timestamp; will be overwritten in gfs2_dinode_in. */
180 inode->i_atime.tv_sec = 1LL << (8 * sizeof(inode->i_atime.tv_sec) - 1);
181 inode->i_atime.tv_nsec = 0;
183 glock_set_object(ip->i_gl, ip);
185 if (type == DT_UNKNOWN) {
186 /* Inode glock must be locked already */
187 error = gfs2_instantiate(&i_gh);
189 glock_clear_object(ip->i_gl, ip);
193 ip->i_no_formal_ino = no_formal_ino;
194 inode->i_mode = DT2IF(type);
197 if (gfs2_holder_initialized(&i_gh))
198 gfs2_glock_dq_uninit(&i_gh);
199 glock_set_object(ip->i_iopen_gh.gh_gl, ip);
202 unlock_new_inode(inode);
205 if (no_formal_ino && ip->i_no_formal_ino &&
206 no_formal_ino != ip->i_no_formal_ino) {
208 return ERR_PTR(-ESTALE);
214 if (gfs2_holder_initialized(&ip->i_iopen_gh))
215 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
216 if (gfs2_holder_initialized(&i_gh))
217 gfs2_glock_dq_uninit(&i_gh);
219 return ERR_PTR(error);
223 * gfs2_lookup_by_inum - look up an inode by inode number
224 * @sdp: The super block
225 * @no_addr: The inode number
226 * @no_formal_ino: The inode generation number (0 for any)
227 * @blktype: Requested block type (see gfs2_inode_lookup)
229 struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr,
230 u64 no_formal_ino, unsigned int blktype)
232 struct super_block *sb = sdp->sd_vfs;
236 inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, no_formal_ino,
243 if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM)
250 return ERR_PTR(error);
254 struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
258 gfs2_str2qstr(&qstr, name);
259 inode = gfs2_lookupi(dip, &qstr, 1);
260 /* gfs2_lookupi has inconsistent callers: vfs
261 * related routines expect NULL for no entry found,
262 * gfs2_lookup_simple callers expect ENOENT
263 * and do not check for NULL.
266 return ERR_PTR(-ENOENT);
273 * gfs2_lookupi - Look up a filename in a directory and return its inode
274 * @dir: The inode of the directory containing the inode to look-up
275 * @name: The name of the inode to look for
276 * @is_root: If 1, ignore the caller's permissions
278 * This can be called via the VFS filldir function when NFS is doing
279 * a readdirplus and the inode which its intending to stat isn't
280 * already in cache. In this case we must not take the directory glock
281 * again, since the readdir call will have already taken that lock.
286 struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
289 struct super_block *sb = dir->i_sb;
290 struct gfs2_inode *dip = GFS2_I(dir);
291 struct gfs2_holder d_gh;
293 struct inode *inode = NULL;
295 gfs2_holder_mark_uninitialized(&d_gh);
296 if (!name->len || name->len > GFS2_FNAMESIZE)
297 return ERR_PTR(-ENAMETOOLONG);
299 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
300 (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
301 dir == d_inode(sb->s_root))) {
306 if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) {
307 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
309 return ERR_PTR(error);
313 error = gfs2_permission(&init_user_ns, dir, MAY_EXEC);
318 inode = gfs2_dir_search(dir, name, false);
320 error = PTR_ERR(inode);
322 if (gfs2_holder_initialized(&d_gh))
323 gfs2_glock_dq_uninit(&d_gh);
324 if (error == -ENOENT)
326 return inode ? inode : ERR_PTR(error);
330 * create_ok - OK to create a new on-disk inode here?
331 * @dip: Directory in which dinode is to be created
332 * @name: Name of new dinode
338 static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
343 error = gfs2_permission(&init_user_ns, &dip->i_inode,
344 MAY_WRITE | MAY_EXEC);
348 /* Don't create entries in an unlinked directory */
349 if (!dip->i_inode.i_nlink)
352 if (dip->i_entries == (u32)-1)
354 if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1)
360 static void munge_mode_uid_gid(const struct gfs2_inode *dip,
363 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
364 (dip->i_inode.i_mode & S_ISUID) &&
365 !uid_eq(dip->i_inode.i_uid, GLOBAL_ROOT_UID)) {
366 if (S_ISDIR(inode->i_mode))
367 inode->i_mode |= S_ISUID;
368 else if (!uid_eq(dip->i_inode.i_uid, current_fsuid()))
369 inode->i_mode &= ~07111;
370 inode->i_uid = dip->i_inode.i_uid;
372 inode->i_uid = current_fsuid();
374 if (dip->i_inode.i_mode & S_ISGID) {
375 if (S_ISDIR(inode->i_mode))
376 inode->i_mode |= S_ISGID;
377 inode->i_gid = dip->i_inode.i_gid;
379 inode->i_gid = current_fsgid();
382 static int alloc_dinode(struct gfs2_inode *ip, u32 flags, unsigned *dblocks)
384 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
385 struct gfs2_alloc_parms ap = { .target = *dblocks, .aflags = flags, };
388 error = gfs2_quota_lock_check(ip, &ap);
392 error = gfs2_inplace_reserve(ip, &ap);
396 error = gfs2_trans_begin(sdp, (*dblocks * RES_RG_BIT) + RES_STATFS + RES_QUOTA, 0);
400 error = gfs2_alloc_blocks(ip, &ip->i_no_addr, dblocks, 1, &ip->i_generation);
401 ip->i_no_formal_ino = ip->i_generation;
402 ip->i_inode.i_ino = ip->i_no_addr;
403 ip->i_goal = ip->i_no_addr;
408 gfs2_inplace_release(ip);
410 gfs2_quota_unlock(ip);
415 static void gfs2_init_dir(struct buffer_head *dibh,
416 const struct gfs2_inode *parent)
418 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
419 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
421 gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent);
422 dent->de_inum = di->di_num; /* already GFS2 endian */
423 dent->de_type = cpu_to_be16(DT_DIR);
425 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
426 gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
427 gfs2_inum_out(parent, dent);
428 dent->de_type = cpu_to_be16(DT_DIR);
433 * gfs2_init_xattr - Initialise an xattr block for a new inode
434 * @ip: The inode in question
436 * This sets up an empty xattr block for a new inode, ready to
437 * take any ACLs, LSM xattrs, etc.
440 static void gfs2_init_xattr(struct gfs2_inode *ip)
442 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
443 struct buffer_head *bh;
444 struct gfs2_ea_header *ea;
446 bh = gfs2_meta_new(ip->i_gl, ip->i_eattr);
447 gfs2_trans_add_meta(ip->i_gl, bh);
448 gfs2_metatype_set(bh, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
449 gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header));
451 ea = GFS2_EA_BH2FIRST(bh);
452 ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
453 ea->ea_type = GFS2_EATYPE_UNUSED;
454 ea->ea_flags = GFS2_EAFLAG_LAST;
460 * init_dinode - Fill in a new dinode structure
461 * @dip: The directory this inode is being created in
463 * @symname: The symlink destination (if a symlink)
467 static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip,
470 struct gfs2_dinode *di;
471 struct buffer_head *dibh;
473 dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr);
474 gfs2_trans_add_meta(ip->i_gl, dibh);
475 di = (struct gfs2_dinode *)dibh->b_data;
476 gfs2_dinode_out(ip, di);
478 di->di_major = cpu_to_be32(imajor(&ip->i_inode));
479 di->di_minor = cpu_to_be32(iminor(&ip->i_inode));
483 memset(&di->__pad4, 0, sizeof(di->__pad4));
484 memset(&di->di_reserved, 0, sizeof(di->di_reserved));
485 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
487 switch(ip->i_inode.i_mode & S_IFMT) {
489 gfs2_init_dir(dibh, dip);
492 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size);
496 set_buffer_uptodate(dibh);
501 * gfs2_trans_da_blks - Calculate number of blocks to link inode
502 * @dip: The directory we are linking into
503 * @da: The dir add information
504 * @nr_inodes: The number of inodes involved
506 * This calculate the number of blocks we need to reserve in a
507 * transaction to link @nr_inodes into a directory. In most cases
508 * @nr_inodes will be 2 (the directory plus the inode being linked in)
509 * but in case of rename, 4 may be required.
511 * Returns: Number of blocks
514 static unsigned gfs2_trans_da_blks(const struct gfs2_inode *dip,
515 const struct gfs2_diradd *da,
518 return da->nr_blocks + gfs2_rg_blocks(dip, da->nr_blocks) +
519 (nr_inodes * RES_DINODE) + RES_QUOTA + RES_STATFS;
522 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
523 struct gfs2_inode *ip, struct gfs2_diradd *da)
525 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
526 struct gfs2_alloc_parms ap = { .target = da->nr_blocks, };
530 error = gfs2_quota_lock_check(dip, &ap);
532 goto fail_quota_locks;
534 error = gfs2_inplace_reserve(dip, &ap);
536 goto fail_quota_locks;
538 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, da, 2), 0);
542 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
544 goto fail_quota_locks;
547 error = gfs2_dir_add(&dip->i_inode, name, ip, da);
551 gfs2_inplace_release(dip);
553 gfs2_quota_unlock(dip);
557 static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
560 const struct xattr *xattr;
563 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
564 err = __gfs2_xattr_set(inode, xattr->name, xattr->value,
566 GFS2_EATYPE_SECURITY);
574 * gfs2_create_inode - Create a new inode
575 * @dir: The parent directory
576 * @dentry: The new dentry
577 * @file: If non-NULL, the file which is being opened
578 * @mode: The permissions on the new inode
579 * @dev: For device nodes, this is the device number
580 * @symname: For symlinks, this is the link destination
581 * @size: The initial size of the inode (ignored for directories)
582 * @excl: Force fail if inode exists
584 * Returns: 0 on success, or error code
587 static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
589 umode_t mode, dev_t dev, const char *symname,
590 unsigned int size, int excl)
592 const struct qstr *name = &dentry->d_name;
593 struct posix_acl *default_acl, *acl;
594 struct gfs2_holder ghs[2];
595 struct inode *inode = NULL;
596 struct gfs2_inode *dip = GFS2_I(dir), *ip;
597 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
598 struct gfs2_glock *io_gl;
599 int error, free_vfs_inode = 1;
602 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
604 if (!name->len || name->len > GFS2_FNAMESIZE)
605 return -ENAMETOOLONG;
607 error = gfs2_qa_get(dip);
611 error = gfs2_rindex_update(sdp);
615 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
618 gfs2_holder_mark_uninitialized(ghs + 1);
620 error = create_ok(dip, name, mode);
624 inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl);
625 error = PTR_ERR(inode);
626 if (!IS_ERR(inode)) {
627 if (S_ISDIR(inode->i_mode)) {
629 inode = ERR_PTR(-EISDIR);
632 d_instantiate(dentry, inode);
635 if (S_ISREG(inode->i_mode))
636 error = finish_open(file, dentry, gfs2_open_common);
638 error = finish_no_open(file, NULL);
640 gfs2_glock_dq_uninit(ghs);
642 } else if (error != -ENOENT) {
646 error = gfs2_diradd_alloc_required(dir, name, &da);
650 inode = new_inode(sdp->sd_vfs);
655 error = posix_acl_create(dir, &mode, &default_acl, &acl);
660 error = gfs2_qa_get(ip);
664 inode->i_mode = mode;
665 set_nlink(inode, S_ISDIR(mode) ? 2 : 1);
667 inode->i_size = size;
668 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
669 munge_mode_uid_gid(dip, inode);
670 check_and_update_goal(dip);
671 ip->i_goal = dip->i_goal;
677 ip->i_no_addr = 0; /* Temporarily zero until real addr is assigned */
679 switch(mode & S_IFMT) {
681 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) ||
682 gfs2_tune_get(sdp, gt_new_files_jdata))
683 ip->i_diskflags |= GFS2_DIF_JDATA;
684 gfs2_set_aops(inode);
687 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA);
688 ip->i_diskflags |= GFS2_DIF_JDATA;
693 /* Force SYSTEM flag on all files and subdirs of a SYSTEM directory */
694 if (dip->i_diskflags & GFS2_DIF_SYSTEM)
695 ip->i_diskflags |= GFS2_DIF_SYSTEM;
697 gfs2_set_inode_flags(inode);
699 if ((GFS2_I(d_inode(sdp->sd_root_dir)) == dip) ||
700 (dip->i_diskflags & GFS2_DIF_TOPDIR))
701 aflags |= GFS2_AF_ORLOV;
703 if (default_acl || acl)
706 error = alloc_dinode(ip, aflags, &blocks);
708 goto fail_free_inode;
710 gfs2_set_inode_blocks(inode, blocks);
712 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
714 goto fail_free_inode;
716 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
718 goto fail_free_inode;
719 gfs2_cancel_delete_work(io_gl);
721 error = insert_inode_locked4(inode, ip->i_no_addr, iget_test, &ip->i_no_addr);
724 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT | GL_NOPID,
729 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
733 error = gfs2_trans_begin(sdp, blocks, 0);
738 ip->i_eattr = ip->i_no_addr + 1;
741 init_dinode(dip, ip, symname);
744 glock_set_object(ip->i_gl, ip);
745 glock_set_object(io_gl, ip);
748 free_vfs_inode = 0; /* After this point, the inode is no longer
749 considered free. Any failures need to undo
750 the gfs2 structures. */
752 error = __gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
755 posix_acl_release(default_acl);
759 error = __gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS);
762 posix_acl_release(acl);
766 error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name,
767 &gfs2_initxattrs, NULL);
771 error = link_dinode(dip, name, ip, &da);
775 mark_inode_dirty(inode);
776 d_instantiate(dentry, inode);
777 /* After instantiate, errors should result in evict which will destroy
778 * both inode and iopen glocks properly. */
780 file->f_mode |= FMODE_CREATED;
781 error = finish_open(file, dentry, gfs2_open_common);
783 gfs2_glock_dq_uninit(ghs);
785 gfs2_glock_dq_uninit(ghs + 1);
786 gfs2_glock_put(io_gl);
788 unlock_new_inode(inode);
792 glock_clear_object(ip->i_gl, ip);
793 glock_clear_object(io_gl, ip);
795 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
797 gfs2_glock_put(io_gl);
800 if (free_vfs_inode) /* else evict will do the put for us */
801 gfs2_glock_put(ip->i_gl);
803 gfs2_rs_deltree(&ip->i_res);
806 posix_acl_release(default_acl);
807 posix_acl_release(acl);
809 gfs2_dir_no_add(&da);
810 gfs2_glock_dq_uninit(ghs);
811 if (!IS_ERR_OR_NULL(inode)) {
814 mark_inode_dirty(inode);
815 set_bit(free_vfs_inode ? GIF_FREE_VFS_INODE : GIF_ALLOC_FAILED,
816 &GFS2_I(inode)->i_flags);
817 if (inode->i_state & I_NEW)
822 if (gfs2_holder_initialized(ghs + 1))
823 gfs2_glock_dq_uninit(ghs + 1);
830 * gfs2_create - Create a file
831 * @mnt_userns: User namespace of the mount the inode was found from
832 * @dir: The directory in which to create the file
833 * @dentry: The dentry of the new file
834 * @mode: The mode of the new file
835 * @excl: Force fail if inode exists
840 static int gfs2_create(struct user_namespace *mnt_userns, struct inode *dir,
841 struct dentry *dentry, umode_t mode, bool excl)
843 return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl);
847 * __gfs2_lookup - Look up a filename in a directory and return its inode
848 * @dir: The directory inode
849 * @dentry: The dentry of the new inode
850 * @file: File to be opened
856 static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry,
861 struct gfs2_holder gh;
862 struct gfs2_glock *gl;
865 inode = gfs2_lookupi(dir, &dentry->d_name, 0);
871 return ERR_CAST(inode);
873 gl = GFS2_I(inode)->i_gl;
874 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
877 return ERR_PTR(error);
880 d = d_splice_alias(inode, dentry);
882 gfs2_glock_dq_uninit(&gh);
885 if (file && S_ISREG(inode->i_mode))
886 error = finish_open(file, dentry, gfs2_open_common);
888 gfs2_glock_dq_uninit(&gh);
891 return ERR_PTR(error);
896 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
899 return __gfs2_lookup(dir, dentry, NULL);
903 * gfs2_link - Link to a file
904 * @old_dentry: The inode to link
905 * @dir: Add link to this directory
906 * @dentry: The name of the link
908 * Link the inode in "old_dentry" into the directory "dir" with the
914 static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
915 struct dentry *dentry)
917 struct gfs2_inode *dip = GFS2_I(dir);
918 struct gfs2_sbd *sdp = GFS2_SB(dir);
919 struct inode *inode = d_inode(old_dentry);
920 struct gfs2_inode *ip = GFS2_I(inode);
921 struct gfs2_holder ghs[2];
922 struct buffer_head *dibh;
923 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
926 if (S_ISDIR(inode->i_mode))
929 error = gfs2_qa_get(dip);
933 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
934 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
936 error = gfs2_glock_nq(ghs); /* parent */
940 error = gfs2_glock_nq(ghs + 1); /* child */
945 if (inode->i_nlink == 0)
948 error = gfs2_permission(&init_user_ns, dir, MAY_WRITE | MAY_EXEC);
952 error = gfs2_dir_check(dir, &dentry->d_name, NULL);
964 if (!dip->i_inode.i_nlink)
967 if (dip->i_entries == (u32)-1)
970 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
973 if (!ip->i_inode.i_nlink)
976 if (ip->i_inode.i_nlink == (u32)-1)
979 error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da);
984 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
985 error = gfs2_quota_lock_check(dip, &ap);
989 error = gfs2_inplace_reserve(dip, &ap);
993 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0);
997 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
1002 error = gfs2_meta_inode_buffer(ip, &dibh);
1006 error = gfs2_dir_add(dir, &dentry->d_name, ip, &da);
1010 gfs2_trans_add_meta(ip->i_gl, dibh);
1011 inc_nlink(&ip->i_inode);
1012 ip->i_inode.i_ctime = current_time(&ip->i_inode);
1014 d_instantiate(dentry, inode);
1015 mark_inode_dirty(inode);
1020 gfs2_trans_end(sdp);
1023 gfs2_inplace_release(dip);
1026 gfs2_quota_unlock(dip);
1028 gfs2_dir_no_add(&da);
1029 gfs2_glock_dq(ghs + 1);
1034 gfs2_holder_uninit(ghs);
1035 gfs2_holder_uninit(ghs + 1);
1040 * gfs2_unlink_ok - check to see that a inode is still in a directory
1041 * @dip: the directory
1042 * @name: the name of the file
1045 * Assumes that the lock on (at least) @dip is held.
1047 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
1050 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
1051 const struct gfs2_inode *ip)
1055 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
1058 if ((dip->i_inode.i_mode & S_ISVTX) &&
1059 !uid_eq(dip->i_inode.i_uid, current_fsuid()) &&
1060 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER))
1063 if (IS_APPEND(&dip->i_inode))
1066 error = gfs2_permission(&init_user_ns, &dip->i_inode,
1067 MAY_WRITE | MAY_EXEC);
1071 return gfs2_dir_check(&dip->i_inode, name, ip);
1075 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it
1076 * @dip: The parent directory
1077 * @dentry: The dentry to unlink
1079 * Called with all the locks and in a transaction. This will only be
1080 * called for a directory after it has been checked to ensure it is empty.
1082 * Returns: 0 on success, or an error
1085 static int gfs2_unlink_inode(struct gfs2_inode *dip,
1086 const struct dentry *dentry)
1088 struct inode *inode = d_inode(dentry);
1089 struct gfs2_inode *ip = GFS2_I(inode);
1092 error = gfs2_dir_del(dip, dentry);
1097 inode->i_ctime = current_time(inode);
1098 if (S_ISDIR(inode->i_mode))
1102 mark_inode_dirty(inode);
1103 if (inode->i_nlink == 0)
1104 gfs2_unlink_di(inode);
1110 * gfs2_unlink - Unlink an inode (this does rmdir as well)
1111 * @dir: The inode of the directory containing the inode to unlink
1112 * @dentry: The file itself
1114 * This routine uses the type of the inode as a flag to figure out
1115 * whether this is an unlink or an rmdir.
1120 static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
1122 struct gfs2_inode *dip = GFS2_I(dir);
1123 struct gfs2_sbd *sdp = GFS2_SB(dir);
1124 struct inode *inode = d_inode(dentry);
1125 struct gfs2_inode *ip = GFS2_I(inode);
1126 struct gfs2_holder ghs[3];
1127 struct gfs2_rgrpd *rgd;
1130 error = gfs2_rindex_update(sdp);
1136 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1137 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
1139 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1143 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, LM_FLAG_NODE_SCOPE, ghs + 2);
1146 error = gfs2_glock_nq(ghs); /* parent */
1150 error = gfs2_glock_nq(ghs + 1); /* child */
1155 if (inode->i_nlink == 0)
1158 if (S_ISDIR(inode->i_mode)) {
1160 if (ip->i_entries > 2 || inode->i_nlink > 2)
1164 error = gfs2_glock_nq(ghs + 2); /* rgrp */
1168 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
1172 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0);
1176 error = gfs2_unlink_inode(dip, dentry);
1177 gfs2_trans_end(sdp);
1180 gfs2_glock_dq(ghs + 2);
1182 gfs2_glock_dq(ghs + 1);
1186 gfs2_holder_uninit(ghs + 2);
1188 gfs2_holder_uninit(ghs + 1);
1189 gfs2_holder_uninit(ghs);
1194 * gfs2_symlink - Create a symlink
1195 * @mnt_userns: User namespace of the mount the inode was found from
1196 * @dir: The directory to create the symlink in
1197 * @dentry: The dentry to put the symlink in
1198 * @symname: The thing which the link points to
1203 static int gfs2_symlink(struct user_namespace *mnt_userns, struct inode *dir,
1204 struct dentry *dentry, const char *symname)
1208 size = strlen(symname);
1209 if (size >= gfs2_max_stuffed_size(GFS2_I(dir)))
1210 return -ENAMETOOLONG;
1212 return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0);
1216 * gfs2_mkdir - Make a directory
1217 * @mnt_userns: User namespace of the mount the inode was found from
1218 * @dir: The parent directory of the new one
1219 * @dentry: The dentry of the new directory
1220 * @mode: The mode of the new directory
1225 static int gfs2_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
1226 struct dentry *dentry, umode_t mode)
1228 unsigned dsize = gfs2_max_stuffed_size(GFS2_I(dir));
1229 return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0);
1233 * gfs2_mknod - Make a special file
1234 * @mnt_userns: User namespace of the mount the inode was found from
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 user_namespace *mnt_userns, struct inode *dir,
1243 struct dentry *dentry, umode_t mode, dev_t dev)
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,
1453 LM_FLAG_NODE_SCOPE, &rd_gh);
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(&init_user_ns, ndir,
1493 MAY_WRITE | MAY_EXEC);
1497 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
1510 if (!ndip->i_inode.i_nlink) {
1514 if (ndip->i_entries == (u32)-1) {
1518 if (S_ISDIR(ip->i_inode.i_mode) &&
1519 ndip->i_inode.i_nlink == (u32)-1) {
1526 /* Check out the dir to be renamed */
1529 error = gfs2_permission(&init_user_ns, d_inode(odentry),
1536 error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da);
1542 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
1543 error = gfs2_quota_lock_check(ndip, &ap);
1547 error = gfs2_inplace_reserve(ndip, &ap);
1551 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) +
1552 4 * RES_LEAF + 4, 0);
1556 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
1557 5 * RES_LEAF + 4, 0);
1562 /* Remove the target file, if it exists */
1565 error = gfs2_unlink_inode(ndip, ndentry);
1567 error = update_moved_ino(ip, ndip, dir_rename);
1571 error = gfs2_dir_del(odip, odentry);
1575 error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da);
1580 gfs2_trans_end(sdp);
1583 gfs2_inplace_release(ndip);
1586 gfs2_quota_unlock(ndip);
1588 gfs2_dir_no_add(&da);
1589 if (gfs2_holder_initialized(&rd_gh))
1590 gfs2_glock_dq_uninit(&rd_gh);
1593 if (gfs2_holder_queued(ghs + x))
1594 gfs2_glock_dq(ghs + x);
1595 gfs2_holder_uninit(ghs + x);
1598 if (gfs2_holder_initialized(&r_gh))
1599 gfs2_glock_dq_uninit(&r_gh);
1606 * gfs2_exchange - exchange two files
1607 * @odir: Parent directory of old file name
1608 * @odentry: The old dentry of the file
1609 * @ndir: Parent directory of new file name
1610 * @ndentry: The new dentry of the file
1611 * @flags: The rename flags
1616 static int gfs2_exchange(struct inode *odir, struct dentry *odentry,
1617 struct inode *ndir, struct dentry *ndentry,
1620 struct gfs2_inode *odip = GFS2_I(odir);
1621 struct gfs2_inode *ndip = GFS2_I(ndir);
1622 struct gfs2_inode *oip = GFS2_I(odentry->d_inode);
1623 struct gfs2_inode *nip = GFS2_I(ndentry->d_inode);
1624 struct gfs2_sbd *sdp = GFS2_SB(odir);
1625 struct gfs2_holder ghs[4], r_gh;
1626 unsigned int num_gh;
1628 umode_t old_mode = oip->i_inode.i_mode;
1629 umode_t new_mode = nip->i_inode.i_mode;
1632 gfs2_holder_mark_uninitialized(&r_gh);
1633 error = gfs2_rindex_update(sdp);
1638 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1643 if (S_ISDIR(old_mode)) {
1644 /* don't move a directory into its subdir */
1645 error = gfs2_ok_to_move(oip, ndip);
1650 if (S_ISDIR(new_mode)) {
1651 /* don't move a directory into its subdir */
1652 error = gfs2_ok_to_move(nip, odip);
1659 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs);
1661 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC,
1665 gfs2_holder_init(oip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh);
1668 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh);
1671 for (x = 0; x < num_gh; x++) {
1672 error = gfs2_glock_nq(ghs + x);
1677 error = gfs2_glock_async_wait(num_gh, ghs);
1682 if (oip->i_inode.i_nlink == 0 || nip->i_inode.i_nlink == 0)
1685 error = gfs2_unlink_ok(odip, &odentry->d_name, oip);
1688 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1692 if (S_ISDIR(old_mode)) {
1693 error = gfs2_permission(&init_user_ns, odentry->d_inode,
1698 if (S_ISDIR(new_mode)) {
1699 error = gfs2_permission(&init_user_ns, ndentry->d_inode,
1704 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 4 * RES_LEAF, 0);
1708 error = update_moved_ino(oip, ndip, S_ISDIR(old_mode));
1712 error = update_moved_ino(nip, odip, S_ISDIR(new_mode));
1716 error = gfs2_dir_mvino(ndip, &ndentry->d_name, oip,
1721 error = gfs2_dir_mvino(odip, &odentry->d_name, nip,
1727 if (S_ISDIR(new_mode) && !S_ISDIR(old_mode)) {
1728 inc_nlink(&odip->i_inode);
1729 drop_nlink(&ndip->i_inode);
1730 } else if (S_ISDIR(old_mode) && !S_ISDIR(new_mode)) {
1731 inc_nlink(&ndip->i_inode);
1732 drop_nlink(&odip->i_inode);
1735 mark_inode_dirty(&ndip->i_inode);
1737 mark_inode_dirty(&odip->i_inode);
1740 gfs2_trans_end(sdp);
1743 if (gfs2_holder_queued(ghs + x))
1744 gfs2_glock_dq(ghs + x);
1745 gfs2_holder_uninit(ghs + x);
1748 if (gfs2_holder_initialized(&r_gh))
1749 gfs2_glock_dq_uninit(&r_gh);
1754 static int gfs2_rename2(struct user_namespace *mnt_userns, struct inode *odir,
1755 struct dentry *odentry, struct inode *ndir,
1756 struct dentry *ndentry, unsigned int flags)
1758 flags &= ~RENAME_NOREPLACE;
1760 if (flags & ~RENAME_EXCHANGE)
1763 if (flags & RENAME_EXCHANGE)
1764 return gfs2_exchange(odir, odentry, ndir, ndentry, flags);
1766 return gfs2_rename(odir, odentry, ndir, ndentry);
1770 * gfs2_get_link - Follow a symbolic link
1771 * @dentry: The dentry of the link
1772 * @inode: The inode of the link
1773 * @done: destructor for return value
1775 * This can handle symlinks of any size.
1777 * Returns: 0 on success or error code
1780 static const char *gfs2_get_link(struct dentry *dentry,
1781 struct inode *inode,
1782 struct delayed_call *done)
1784 struct gfs2_inode *ip = GFS2_I(inode);
1785 struct gfs2_holder i_gh;
1786 struct buffer_head *dibh;
1792 return ERR_PTR(-ECHILD);
1794 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1795 error = gfs2_glock_nq(&i_gh);
1797 gfs2_holder_uninit(&i_gh);
1798 return ERR_PTR(error);
1801 size = (unsigned int)i_size_read(&ip->i_inode);
1803 gfs2_consist_inode(ip);
1804 buf = ERR_PTR(-EIO);
1808 error = gfs2_meta_inode_buffer(ip, &dibh);
1810 buf = ERR_PTR(error);
1814 buf = kzalloc(size + 1, GFP_NOFS);
1816 buf = ERR_PTR(-ENOMEM);
1818 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
1821 gfs2_glock_dq_uninit(&i_gh);
1823 set_delayed_call(done, kfree_link, buf);
1829 * @mnt_userns: User namespace of the mount the inode was found from
1831 * @mask: The mask to be tested
1833 * This may be called from the VFS directly, or from within GFS2 with the
1834 * inode locked, so we look to see if the glock is already locked and only
1835 * lock the glock if its not already been done.
1840 int gfs2_permission(struct user_namespace *mnt_userns, struct inode *inode,
1843 struct gfs2_inode *ip;
1844 struct gfs2_holder i_gh;
1847 gfs2_holder_mark_uninitialized(&i_gh);
1849 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1850 if (mask & MAY_NOT_BLOCK)
1852 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1857 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1860 error = generic_permission(&init_user_ns, inode, mask);
1861 if (gfs2_holder_initialized(&i_gh))
1862 gfs2_glock_dq_uninit(&i_gh);
1867 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1869 setattr_copy(&init_user_ns, inode, attr);
1870 mark_inode_dirty(inode);
1874 static int gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1878 if (current->journal_info)
1879 return __gfs2_setattr_simple(inode, attr);
1881 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0);
1885 error = __gfs2_setattr_simple(inode, attr);
1886 gfs2_trans_end(GFS2_SB(inode));
1890 static int setattr_chown(struct inode *inode, struct iattr *attr)
1892 struct gfs2_inode *ip = GFS2_I(inode);
1893 struct gfs2_sbd *sdp = GFS2_SB(inode);
1897 struct gfs2_alloc_parms ap;
1899 ouid = inode->i_uid;
1900 ogid = inode->i_gid;
1901 nuid = attr->ia_uid;
1902 ngid = attr->ia_gid;
1904 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid))
1905 ouid = nuid = NO_UID_QUOTA_CHANGE;
1906 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid))
1907 ogid = ngid = NO_GID_QUOTA_CHANGE;
1908 error = gfs2_qa_get(ip);
1912 error = gfs2_rindex_update(sdp);
1916 error = gfs2_quota_lock(ip, nuid, ngid);
1920 ap.target = gfs2_get_inode_blocks(&ip->i_inode);
1922 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1923 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1924 error = gfs2_quota_check(ip, nuid, ngid, &ap);
1929 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1933 error = gfs2_setattr_simple(inode, attr);
1937 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1938 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1939 gfs2_quota_change(ip, -(s64)ap.target, ouid, ogid);
1940 gfs2_quota_change(ip, ap.target, nuid, ngid);
1944 gfs2_trans_end(sdp);
1946 gfs2_quota_unlock(ip);
1953 * gfs2_setattr - Change attributes on an inode
1954 * @mnt_userns: User namespace of the mount the inode was found from
1955 * @dentry: The dentry which is changing
1956 * @attr: The structure describing the change
1958 * The VFS layer wants to change one or more of an inodes attributes. Write
1959 * that change out to disk.
1964 static int gfs2_setattr(struct user_namespace *mnt_userns,
1965 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);
1980 error = may_setattr(&init_user_ns, inode, attr->ia_valid);
1984 error = setattr_prepare(&init_user_ns, 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(&init_user_ns, inode,
2001 mark_inode_dirty(inode);
2002 gfs2_glock_dq_uninit(&i_gh);
2009 * gfs2_getattr - Read out an inode's attributes
2010 * @mnt_userns: user namespace of the mount the inode was found from
2011 * @path: Object to query
2012 * @stat: The inode's stats
2013 * @request_mask: Mask of STATX_xxx flags indicating the caller's interests
2014 * @flags: AT_STATX_xxx setting
2016 * This may be called from the VFS directly, or from within GFS2 with the
2017 * inode locked, so we look to see if the glock is already locked and only
2018 * lock the glock if its not already been done. Note that its the NFS
2019 * readdirplus operation which causes this to be called (from filldir)
2020 * with the glock already held.
2025 static int gfs2_getattr(struct user_namespace *mnt_userns,
2026 const struct path *path, struct kstat *stat,
2027 u32 request_mask, unsigned int flags)
2029 struct inode *inode = d_inode(path->dentry);
2030 struct gfs2_inode *ip = GFS2_I(inode);
2031 struct gfs2_holder gh;
2035 gfs2_holder_mark_uninitialized(&gh);
2036 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
2037 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
2042 gfsflags = ip->i_diskflags;
2043 if (gfsflags & GFS2_DIF_APPENDONLY)
2044 stat->attributes |= STATX_ATTR_APPEND;
2045 if (gfsflags & GFS2_DIF_IMMUTABLE)
2046 stat->attributes |= STATX_ATTR_IMMUTABLE;
2048 stat->attributes_mask |= (STATX_ATTR_APPEND |
2049 STATX_ATTR_COMPRESSED |
2050 STATX_ATTR_ENCRYPTED |
2051 STATX_ATTR_IMMUTABLE |
2054 generic_fillattr(&init_user_ns, inode, stat);
2056 if (gfs2_holder_initialized(&gh))
2057 gfs2_glock_dq_uninit(&gh);
2062 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
2065 struct gfs2_inode *ip = GFS2_I(inode);
2066 struct gfs2_holder gh;
2069 inode_lock_shared(inode);
2071 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2075 ret = iomap_fiemap(inode, fieinfo, start, len, &gfs2_iomap_ops);
2077 gfs2_glock_dq_uninit(&gh);
2080 inode_unlock_shared(inode);
2084 loff_t gfs2_seek_data(struct file *file, loff_t offset)
2086 struct inode *inode = file->f_mapping->host;
2087 struct gfs2_inode *ip = GFS2_I(inode);
2088 struct gfs2_holder gh;
2091 inode_lock_shared(inode);
2092 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2094 ret = iomap_seek_data(inode, offset, &gfs2_iomap_ops);
2095 gfs2_glock_dq_uninit(&gh);
2096 inode_unlock_shared(inode);
2100 return vfs_setpos(file, ret, inode->i_sb->s_maxbytes);
2103 loff_t gfs2_seek_hole(struct file *file, loff_t offset)
2105 struct inode *inode = file->f_mapping->host;
2106 struct gfs2_inode *ip = GFS2_I(inode);
2107 struct gfs2_holder gh;
2110 inode_lock_shared(inode);
2111 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2113 ret = iomap_seek_hole(inode, offset, &gfs2_iomap_ops);
2114 gfs2_glock_dq_uninit(&gh);
2115 inode_unlock_shared(inode);
2119 return vfs_setpos(file, ret, inode->i_sb->s_maxbytes);
2122 static int gfs2_update_time(struct inode *inode, struct timespec64 *time,
2125 struct gfs2_inode *ip = GFS2_I(inode);
2126 struct gfs2_glock *gl = ip->i_gl;
2127 struct gfs2_holder *gh;
2130 gh = gfs2_glock_is_locked_by_me(gl);
2131 if (gh && !gfs2_glock_is_held_excl(gl)) {
2133 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, gh);
2134 error = gfs2_glock_nq(gh);
2138 return generic_update_time(inode, time, flags);
2141 static const struct inode_operations gfs2_file_iops = {
2142 .permission = gfs2_permission,
2143 .setattr = gfs2_setattr,
2144 .getattr = gfs2_getattr,
2145 .listxattr = gfs2_listxattr,
2146 .fiemap = gfs2_fiemap,
2147 .get_acl = gfs2_get_acl,
2148 .set_acl = gfs2_set_acl,
2149 .update_time = gfs2_update_time,
2150 .fileattr_get = gfs2_fileattr_get,
2151 .fileattr_set = gfs2_fileattr_set,
2154 static const struct inode_operations gfs2_dir_iops = {
2155 .create = gfs2_create,
2156 .lookup = gfs2_lookup,
2158 .unlink = gfs2_unlink,
2159 .symlink = gfs2_symlink,
2160 .mkdir = gfs2_mkdir,
2161 .rmdir = gfs2_unlink,
2162 .mknod = gfs2_mknod,
2163 .rename = gfs2_rename2,
2164 .permission = gfs2_permission,
2165 .setattr = gfs2_setattr,
2166 .getattr = gfs2_getattr,
2167 .listxattr = gfs2_listxattr,
2168 .fiemap = gfs2_fiemap,
2169 .get_acl = gfs2_get_acl,
2170 .set_acl = gfs2_set_acl,
2171 .update_time = gfs2_update_time,
2172 .atomic_open = gfs2_atomic_open,
2173 .fileattr_get = gfs2_fileattr_get,
2174 .fileattr_set = gfs2_fileattr_set,
2177 static const struct inode_operations gfs2_symlink_iops = {
2178 .get_link = gfs2_get_link,
2179 .permission = gfs2_permission,
2180 .setattr = gfs2_setattr,
2181 .getattr = gfs2_getattr,
2182 .listxattr = gfs2_listxattr,
2183 .fiemap = gfs2_fiemap,