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,
146 * The only caller that sets @blktype to GFS2_BLKST_UNLINKED is
147 * delete_work_func(). Make sure not to cancel the delete work
148 * from within itself here.
150 if (blktype == GFS2_BLKST_UNLINKED)
151 extra_flags |= LM_FLAG_TRY;
153 gfs2_cancel_delete_work(io_gl);
154 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED,
155 GL_EXACT | GL_NOPID | extra_flags,
157 gfs2_glock_put(io_gl);
161 if (type == DT_UNKNOWN || blktype != GFS2_BLKST_FREE) {
163 * The GL_SKIP flag indicates to skip reading the inode
164 * block. We read the inode when instantiating it
165 * after possibly checking the block type.
167 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE,
174 gfs2_inode_already_deleted(ip->i_gl, no_formal_ino))
177 if (blktype != GFS2_BLKST_FREE) {
178 error = gfs2_check_blk_type(sdp, no_addr,
185 set_bit(GLF_INSTANTIATE_NEEDED, &ip->i_gl->gl_flags);
187 /* Lowest possible timestamp; will be overwritten in gfs2_dinode_in. */
188 inode->i_atime.tv_sec = 1LL << (8 * sizeof(inode->i_atime.tv_sec) - 1);
189 inode->i_atime.tv_nsec = 0;
191 glock_set_object(ip->i_gl, ip);
193 if (type == DT_UNKNOWN) {
194 /* Inode glock must be locked already */
195 error = gfs2_instantiate(&i_gh);
197 glock_clear_object(ip->i_gl, ip);
201 ip->i_no_formal_ino = no_formal_ino;
202 inode->i_mode = DT2IF(type);
205 if (gfs2_holder_initialized(&i_gh))
206 gfs2_glock_dq_uninit(&i_gh);
207 glock_set_object(ip->i_iopen_gh.gh_gl, ip);
210 unlock_new_inode(inode);
213 if (no_formal_ino && ip->i_no_formal_ino &&
214 no_formal_ino != ip->i_no_formal_ino) {
216 return ERR_PTR(-ESTALE);
222 if (error == GLR_TRYFAILED)
224 if (gfs2_holder_initialized(&ip->i_iopen_gh))
225 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
226 if (gfs2_holder_initialized(&i_gh))
227 gfs2_glock_dq_uninit(&i_gh);
229 return ERR_PTR(error);
233 * gfs2_lookup_by_inum - look up an inode by inode number
234 * @sdp: The super block
235 * @no_addr: The inode number
236 * @no_formal_ino: The inode generation number (0 for any)
237 * @blktype: Requested block type (see gfs2_inode_lookup)
239 struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr,
240 u64 no_formal_ino, unsigned int blktype)
242 struct super_block *sb = sdp->sd_vfs;
246 inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, no_formal_ino,
253 if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM)
260 return ERR_PTR(error);
264 struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
268 gfs2_str2qstr(&qstr, name);
269 inode = gfs2_lookupi(dip, &qstr, 1);
270 /* gfs2_lookupi has inconsistent callers: vfs
271 * related routines expect NULL for no entry found,
272 * gfs2_lookup_simple callers expect ENOENT
273 * and do not check for NULL.
276 return ERR_PTR(-ENOENT);
283 * gfs2_lookupi - Look up a filename in a directory and return its inode
284 * @dir: The inode of the directory containing the inode to look-up
285 * @name: The name of the inode to look for
286 * @is_root: If 1, ignore the caller's permissions
288 * This can be called via the VFS filldir function when NFS is doing
289 * a readdirplus and the inode which its intending to stat isn't
290 * already in cache. In this case we must not take the directory glock
291 * again, since the readdir call will have already taken that lock.
296 struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
299 struct super_block *sb = dir->i_sb;
300 struct gfs2_inode *dip = GFS2_I(dir);
301 struct gfs2_holder d_gh;
303 struct inode *inode = NULL;
305 gfs2_holder_mark_uninitialized(&d_gh);
306 if (!name->len || name->len > GFS2_FNAMESIZE)
307 return ERR_PTR(-ENAMETOOLONG);
309 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
310 (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
311 dir == d_inode(sb->s_root))) {
316 if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) {
317 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
319 return ERR_PTR(error);
323 error = gfs2_permission(&init_user_ns, dir, MAY_EXEC);
328 inode = gfs2_dir_search(dir, name, false);
330 error = PTR_ERR(inode);
332 if (gfs2_holder_initialized(&d_gh))
333 gfs2_glock_dq_uninit(&d_gh);
334 if (error == -ENOENT)
336 return inode ? inode : ERR_PTR(error);
340 * create_ok - OK to create a new on-disk inode here?
341 * @dip: Directory in which dinode is to be created
342 * @name: Name of new dinode
348 static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
353 error = gfs2_permission(&init_user_ns, &dip->i_inode,
354 MAY_WRITE | MAY_EXEC);
358 /* Don't create entries in an unlinked directory */
359 if (!dip->i_inode.i_nlink)
362 if (dip->i_entries == (u32)-1)
364 if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1)
370 static void munge_mode_uid_gid(const struct gfs2_inode *dip,
373 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
374 (dip->i_inode.i_mode & S_ISUID) &&
375 !uid_eq(dip->i_inode.i_uid, GLOBAL_ROOT_UID)) {
376 if (S_ISDIR(inode->i_mode))
377 inode->i_mode |= S_ISUID;
378 else if (!uid_eq(dip->i_inode.i_uid, current_fsuid()))
379 inode->i_mode &= ~07111;
380 inode->i_uid = dip->i_inode.i_uid;
382 inode->i_uid = current_fsuid();
384 if (dip->i_inode.i_mode & S_ISGID) {
385 if (S_ISDIR(inode->i_mode))
386 inode->i_mode |= S_ISGID;
387 inode->i_gid = dip->i_inode.i_gid;
389 inode->i_gid = current_fsgid();
392 static int alloc_dinode(struct gfs2_inode *ip, u32 flags, unsigned *dblocks)
394 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
395 struct gfs2_alloc_parms ap = { .target = *dblocks, .aflags = flags, };
398 error = gfs2_quota_lock_check(ip, &ap);
402 error = gfs2_inplace_reserve(ip, &ap);
406 error = gfs2_trans_begin(sdp, (*dblocks * RES_RG_BIT) + RES_STATFS + RES_QUOTA, 0);
410 error = gfs2_alloc_blocks(ip, &ip->i_no_addr, dblocks, 1, &ip->i_generation);
414 ip->i_no_formal_ino = ip->i_generation;
415 ip->i_inode.i_ino = ip->i_no_addr;
416 ip->i_goal = ip->i_no_addr;
418 ip->i_eattr = ip->i_no_addr + 1;
423 gfs2_inplace_release(ip);
425 gfs2_quota_unlock(ip);
430 static void gfs2_init_dir(struct buffer_head *dibh,
431 const struct gfs2_inode *parent)
433 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
434 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
436 gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent);
437 dent->de_inum = di->di_num; /* already GFS2 endian */
438 dent->de_type = cpu_to_be16(DT_DIR);
440 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
441 gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
442 gfs2_inum_out(parent, dent);
443 dent->de_type = cpu_to_be16(DT_DIR);
448 * gfs2_init_xattr - Initialise an xattr block for a new inode
449 * @ip: The inode in question
451 * This sets up an empty xattr block for a new inode, ready to
452 * take any ACLs, LSM xattrs, etc.
455 static void gfs2_init_xattr(struct gfs2_inode *ip)
457 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
458 struct buffer_head *bh;
459 struct gfs2_ea_header *ea;
461 bh = gfs2_meta_new(ip->i_gl, ip->i_eattr);
462 gfs2_trans_add_meta(ip->i_gl, bh);
463 gfs2_metatype_set(bh, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
464 gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header));
466 ea = GFS2_EA_BH2FIRST(bh);
467 ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
468 ea->ea_type = GFS2_EATYPE_UNUSED;
469 ea->ea_flags = GFS2_EAFLAG_LAST;
475 * init_dinode - Fill in a new dinode structure
476 * @dip: The directory this inode is being created in
478 * @symname: The symlink destination (if a symlink)
482 static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip,
485 struct gfs2_dinode *di;
486 struct buffer_head *dibh;
488 dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr);
489 gfs2_trans_add_meta(ip->i_gl, dibh);
490 di = (struct gfs2_dinode *)dibh->b_data;
491 gfs2_dinode_out(ip, di);
493 di->di_major = cpu_to_be32(imajor(&ip->i_inode));
494 di->di_minor = cpu_to_be32(iminor(&ip->i_inode));
498 memset(&di->__pad4, 0, sizeof(di->__pad4));
499 memset(&di->di_reserved, 0, sizeof(di->di_reserved));
500 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
502 switch(ip->i_inode.i_mode & S_IFMT) {
504 gfs2_init_dir(dibh, dip);
507 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size);
511 set_buffer_uptodate(dibh);
516 * gfs2_trans_da_blks - Calculate number of blocks to link inode
517 * @dip: The directory we are linking into
518 * @da: The dir add information
519 * @nr_inodes: The number of inodes involved
521 * This calculate the number of blocks we need to reserve in a
522 * transaction to link @nr_inodes into a directory. In most cases
523 * @nr_inodes will be 2 (the directory plus the inode being linked in)
524 * but in case of rename, 4 may be required.
526 * Returns: Number of blocks
529 static unsigned gfs2_trans_da_blks(const struct gfs2_inode *dip,
530 const struct gfs2_diradd *da,
533 return da->nr_blocks + gfs2_rg_blocks(dip, da->nr_blocks) +
534 (nr_inodes * RES_DINODE) + RES_QUOTA + RES_STATFS;
537 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
538 struct gfs2_inode *ip, struct gfs2_diradd *da)
540 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
541 struct gfs2_alloc_parms ap = { .target = da->nr_blocks, };
545 error = gfs2_quota_lock_check(dip, &ap);
547 goto fail_quota_locks;
549 error = gfs2_inplace_reserve(dip, &ap);
551 goto fail_quota_locks;
553 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, da, 2), 0);
557 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
559 goto fail_quota_locks;
562 error = gfs2_dir_add(&dip->i_inode, name, ip, da);
566 gfs2_inplace_release(dip);
568 gfs2_quota_unlock(dip);
572 static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
575 const struct xattr *xattr;
578 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
579 err = __gfs2_xattr_set(inode, xattr->name, xattr->value,
581 GFS2_EATYPE_SECURITY);
589 * gfs2_create_inode - Create a new inode
590 * @dir: The parent directory
591 * @dentry: The new dentry
592 * @file: If non-NULL, the file which is being opened
593 * @mode: The permissions on the new inode
594 * @dev: For device nodes, this is the device number
595 * @symname: For symlinks, this is the link destination
596 * @size: The initial size of the inode (ignored for directories)
597 * @excl: Force fail if inode exists
599 * FIXME: Change to allocate the disk blocks and write them out in the same
600 * transaction. That way, we can no longer end up in a situation in which an
601 * inode is allocated, the node crashes, and the block looks like a valid
602 * inode. (With atomic creates in place, we will also no longer need to zero
603 * the link count and dirty the inode here on failure.)
605 * Returns: 0 on success, or error code
608 static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
610 umode_t mode, dev_t dev, const char *symname,
611 unsigned int size, int excl)
613 const struct qstr *name = &dentry->d_name;
614 struct posix_acl *default_acl, *acl;
615 struct gfs2_holder d_gh, gh;
616 struct inode *inode = NULL;
617 struct gfs2_inode *dip = GFS2_I(dir), *ip;
618 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
619 struct gfs2_glock *io_gl;
623 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
625 if (!name->len || name->len > GFS2_FNAMESIZE)
626 return -ENAMETOOLONG;
628 error = gfs2_qa_get(dip);
632 error = gfs2_rindex_update(sdp);
636 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, &d_gh);
639 gfs2_holder_mark_uninitialized(&gh);
641 error = create_ok(dip, name, mode);
645 inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl);
646 error = PTR_ERR(inode);
647 if (!IS_ERR(inode)) {
648 if (S_ISDIR(inode->i_mode)) {
650 inode = ERR_PTR(-EISDIR);
653 d_instantiate(dentry, inode);
656 if (S_ISREG(inode->i_mode))
657 error = finish_open(file, dentry, gfs2_open_common);
659 error = finish_no_open(file, NULL);
661 gfs2_glock_dq_uninit(&d_gh);
663 } else if (error != -ENOENT) {
667 error = gfs2_diradd_alloc_required(dir, name, &da);
671 inode = new_inode(sdp->sd_vfs);
677 error = posix_acl_create(dir, &mode, &default_acl, &acl);
681 error = gfs2_qa_get(ip);
685 inode->i_mode = mode;
686 set_nlink(inode, S_ISDIR(mode) ? 2 : 1);
688 inode->i_size = size;
689 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
690 munge_mode_uid_gid(dip, inode);
691 check_and_update_goal(dip);
692 ip->i_goal = dip->i_goal;
698 ip->i_no_addr = 0; /* Temporarily zero until real addr is assigned */
700 switch(mode & S_IFMT) {
702 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) ||
703 gfs2_tune_get(sdp, gt_new_files_jdata))
704 ip->i_diskflags |= GFS2_DIF_JDATA;
705 gfs2_set_aops(inode);
708 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA);
709 ip->i_diskflags |= GFS2_DIF_JDATA;
714 /* Force SYSTEM flag on all files and subdirs of a SYSTEM directory */
715 if (dip->i_diskflags & GFS2_DIF_SYSTEM)
716 ip->i_diskflags |= GFS2_DIF_SYSTEM;
718 gfs2_set_inode_flags(inode);
720 if ((GFS2_I(d_inode(sdp->sd_root_dir)) == dip) ||
721 (dip->i_diskflags & GFS2_DIF_TOPDIR))
722 aflags |= GFS2_AF_ORLOV;
724 if (default_acl || acl)
727 error = alloc_dinode(ip, aflags, &blocks);
729 goto fail_free_inode;
731 gfs2_set_inode_blocks(inode, blocks);
733 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
735 goto fail_free_inode;
737 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
739 goto fail_free_inode;
740 gfs2_cancel_delete_work(io_gl);
743 error = insert_inode_locked4(inode, ip->i_no_addr, iget_test, &ip->i_no_addr);
749 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT | GL_NOPID,
754 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, &gh);
758 error = gfs2_trans_begin(sdp, blocks, 0);
764 init_dinode(dip, ip, symname);
767 glock_set_object(ip->i_gl, ip);
768 glock_set_object(io_gl, ip);
772 error = __gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
775 posix_acl_release(default_acl);
779 error = __gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS);
782 posix_acl_release(acl);
786 error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name,
787 &gfs2_initxattrs, NULL);
791 error = link_dinode(dip, name, ip, &da);
795 mark_inode_dirty(inode);
796 d_instantiate(dentry, inode);
797 /* After instantiate, errors should result in evict which will destroy
798 * both inode and iopen glocks properly. */
800 file->f_mode |= FMODE_CREATED;
801 error = finish_open(file, dentry, gfs2_open_common);
803 gfs2_glock_dq_uninit(&d_gh);
805 gfs2_glock_dq_uninit(&gh);
806 gfs2_glock_put(io_gl);
808 unlock_new_inode(inode);
812 glock_clear_object(ip->i_gl, ip);
813 glock_clear_object(io_gl, ip);
815 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
817 gfs2_glock_put(io_gl);
819 gfs2_rs_deltree(&ip->i_res);
822 posix_acl_release(default_acl);
823 posix_acl_release(acl);
825 gfs2_dir_no_add(&da);
826 gfs2_glock_dq_uninit(&d_gh);
827 if (!IS_ERR_OR_NULL(inode)) {
828 set_bit(GIF_ALLOC_FAILED, &ip->i_flags);
831 mark_inode_dirty(inode);
832 if (inode->i_state & I_NEW)
837 if (gfs2_holder_initialized(&gh))
838 gfs2_glock_dq_uninit(&gh);
845 * gfs2_create - Create a file
846 * @mnt_userns: User namespace of the mount the inode was found from
847 * @dir: The directory in which to create the file
848 * @dentry: The dentry of the new file
849 * @mode: The mode of the new file
850 * @excl: Force fail if inode exists
855 static int gfs2_create(struct user_namespace *mnt_userns, struct inode *dir,
856 struct dentry *dentry, umode_t mode, bool excl)
858 return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl);
862 * __gfs2_lookup - Look up a filename in a directory and return its inode
863 * @dir: The directory inode
864 * @dentry: The dentry of the new inode
865 * @file: File to be opened
871 static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry,
876 struct gfs2_holder gh;
877 struct gfs2_glock *gl;
880 inode = gfs2_lookupi(dir, &dentry->d_name, 0);
886 return ERR_CAST(inode);
888 gl = GFS2_I(inode)->i_gl;
889 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
892 return ERR_PTR(error);
895 d = d_splice_alias(inode, dentry);
897 gfs2_glock_dq_uninit(&gh);
900 if (file && S_ISREG(inode->i_mode))
901 error = finish_open(file, dentry, gfs2_open_common);
903 gfs2_glock_dq_uninit(&gh);
906 return ERR_PTR(error);
911 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
914 return __gfs2_lookup(dir, dentry, NULL);
918 * gfs2_link - Link to a file
919 * @old_dentry: The inode to link
920 * @dir: Add link to this directory
921 * @dentry: The name of the link
923 * Link the inode in "old_dentry" into the directory "dir" with the
929 static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
930 struct dentry *dentry)
932 struct gfs2_inode *dip = GFS2_I(dir);
933 struct gfs2_sbd *sdp = GFS2_SB(dir);
934 struct inode *inode = d_inode(old_dentry);
935 struct gfs2_inode *ip = GFS2_I(inode);
936 struct gfs2_holder ghs[2];
937 struct buffer_head *dibh;
938 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
941 if (S_ISDIR(inode->i_mode))
944 error = gfs2_qa_get(dip);
948 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
949 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
951 error = gfs2_glock_nq(ghs); /* parent */
955 error = gfs2_glock_nq(ghs + 1); /* child */
960 if (inode->i_nlink == 0)
963 error = gfs2_permission(&init_user_ns, dir, MAY_WRITE | MAY_EXEC);
967 error = gfs2_dir_check(dir, &dentry->d_name, NULL);
979 if (!dip->i_inode.i_nlink)
982 if (dip->i_entries == (u32)-1)
985 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
988 if (!ip->i_inode.i_nlink)
991 if (ip->i_inode.i_nlink == (u32)-1)
994 error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da);
999 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
1000 error = gfs2_quota_lock_check(dip, &ap);
1004 error = gfs2_inplace_reserve(dip, &ap);
1008 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0);
1012 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
1017 error = gfs2_meta_inode_buffer(ip, &dibh);
1021 error = gfs2_dir_add(dir, &dentry->d_name, ip, &da);
1025 gfs2_trans_add_meta(ip->i_gl, dibh);
1026 inc_nlink(&ip->i_inode);
1027 ip->i_inode.i_ctime = current_time(&ip->i_inode);
1029 d_instantiate(dentry, inode);
1030 mark_inode_dirty(inode);
1035 gfs2_trans_end(sdp);
1038 gfs2_inplace_release(dip);
1041 gfs2_quota_unlock(dip);
1043 gfs2_dir_no_add(&da);
1044 gfs2_glock_dq(ghs + 1);
1049 gfs2_holder_uninit(ghs);
1050 gfs2_holder_uninit(ghs + 1);
1055 * gfs2_unlink_ok - check to see that a inode is still in a directory
1056 * @dip: the directory
1057 * @name: the name of the file
1060 * Assumes that the lock on (at least) @dip is held.
1062 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
1065 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
1066 const struct gfs2_inode *ip)
1070 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
1073 if ((dip->i_inode.i_mode & S_ISVTX) &&
1074 !uid_eq(dip->i_inode.i_uid, current_fsuid()) &&
1075 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER))
1078 if (IS_APPEND(&dip->i_inode))
1081 error = gfs2_permission(&init_user_ns, &dip->i_inode,
1082 MAY_WRITE | MAY_EXEC);
1086 return gfs2_dir_check(&dip->i_inode, name, ip);
1090 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it
1091 * @dip: The parent directory
1092 * @dentry: The dentry to unlink
1094 * Called with all the locks and in a transaction. This will only be
1095 * called for a directory after it has been checked to ensure it is empty.
1097 * Returns: 0 on success, or an error
1100 static int gfs2_unlink_inode(struct gfs2_inode *dip,
1101 const struct dentry *dentry)
1103 struct inode *inode = d_inode(dentry);
1104 struct gfs2_inode *ip = GFS2_I(inode);
1107 error = gfs2_dir_del(dip, dentry);
1112 inode->i_ctime = current_time(inode);
1113 if (S_ISDIR(inode->i_mode))
1117 mark_inode_dirty(inode);
1118 if (inode->i_nlink == 0)
1119 gfs2_unlink_di(inode);
1125 * gfs2_unlink - Unlink an inode (this does rmdir as well)
1126 * @dir: The inode of the directory containing the inode to unlink
1127 * @dentry: The file itself
1129 * This routine uses the type of the inode as a flag to figure out
1130 * whether this is an unlink or an rmdir.
1135 static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
1137 struct gfs2_inode *dip = GFS2_I(dir);
1138 struct gfs2_sbd *sdp = GFS2_SB(dir);
1139 struct inode *inode = d_inode(dentry);
1140 struct gfs2_inode *ip = GFS2_I(inode);
1141 struct gfs2_holder ghs[3];
1142 struct gfs2_rgrpd *rgd;
1145 error = gfs2_rindex_update(sdp);
1151 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1152 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
1154 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1158 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, LM_FLAG_NODE_SCOPE, ghs + 2);
1161 error = gfs2_glock_nq(ghs); /* parent */
1165 error = gfs2_glock_nq(ghs + 1); /* child */
1170 if (inode->i_nlink == 0)
1173 if (S_ISDIR(inode->i_mode)) {
1175 if (ip->i_entries > 2 || inode->i_nlink > 2)
1179 error = gfs2_glock_nq(ghs + 2); /* rgrp */
1183 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
1187 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0);
1191 error = gfs2_unlink_inode(dip, dentry);
1192 gfs2_trans_end(sdp);
1195 gfs2_glock_dq(ghs + 2);
1197 gfs2_glock_dq(ghs + 1);
1201 gfs2_holder_uninit(ghs + 2);
1203 gfs2_holder_uninit(ghs + 1);
1204 gfs2_holder_uninit(ghs);
1209 * gfs2_symlink - Create a symlink
1210 * @mnt_userns: User namespace of the mount the inode was found from
1211 * @dir: The directory to create the symlink in
1212 * @dentry: The dentry to put the symlink in
1213 * @symname: The thing which the link points to
1218 static int gfs2_symlink(struct user_namespace *mnt_userns, struct inode *dir,
1219 struct dentry *dentry, const char *symname)
1223 size = strlen(symname);
1224 if (size >= gfs2_max_stuffed_size(GFS2_I(dir)))
1225 return -ENAMETOOLONG;
1227 return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0);
1231 * gfs2_mkdir - Make a directory
1232 * @mnt_userns: User namespace of the mount the inode was found from
1233 * @dir: The parent directory of the new one
1234 * @dentry: The dentry of the new directory
1235 * @mode: The mode of the new directory
1240 static int gfs2_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
1241 struct dentry *dentry, umode_t mode)
1243 unsigned dsize = gfs2_max_stuffed_size(GFS2_I(dir));
1244 return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0);
1248 * gfs2_mknod - Make a special file
1249 * @mnt_userns: User namespace of the mount the inode was found from
1250 * @dir: The directory in which the special file will reside
1251 * @dentry: The dentry of the special file
1252 * @mode: The mode of the special file
1253 * @dev: The device specification of the special file
1257 static int gfs2_mknod(struct user_namespace *mnt_userns, struct inode *dir,
1258 struct dentry *dentry, umode_t mode, dev_t dev)
1260 return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0);
1264 * gfs2_atomic_open - Atomically open a file
1265 * @dir: The directory
1266 * @dentry: The proposed new entry
1267 * @file: The proposed new struct file
1268 * @flags: open flags
1271 * Returns: error code or 0 for success
1274 static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry,
1275 struct file *file, unsigned flags,
1279 bool excl = !!(flags & O_EXCL);
1281 if (!d_in_lookup(dentry))
1284 d = __gfs2_lookup(dir, dentry, file);
1289 if (d_really_is_positive(dentry)) {
1290 if (!(file->f_mode & FMODE_OPENED))
1291 return finish_no_open(file, d);
1293 return excl && (flags & O_CREAT) ? -EEXIST : 0;
1299 if (!(flags & O_CREAT))
1302 return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl);
1306 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1310 * Follow @to back to the root and make sure we don't encounter @this
1311 * Assumes we already hold the rename lock.
1316 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1318 struct inode *dir = &to->i_inode;
1319 struct super_block *sb = dir->i_sb;
1326 if (dir == &this->i_inode) {
1330 if (dir == d_inode(sb->s_root)) {
1335 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
1341 error = PTR_ERR(tmp);
1355 * update_moved_ino - Update an inode that's being moved
1356 * @ip: The inode being moved
1357 * @ndip: The parent directory of the new filename
1358 * @dir_rename: True of ip is a directory
1363 static int update_moved_ino(struct gfs2_inode *ip, struct gfs2_inode *ndip,
1367 return gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);
1369 ip->i_inode.i_ctime = current_time(&ip->i_inode);
1370 mark_inode_dirty_sync(&ip->i_inode);
1376 * gfs2_rename - Rename a file
1377 * @odir: Parent directory of old file name
1378 * @odentry: The old dentry of the file
1379 * @ndir: Parent directory of new file name
1380 * @ndentry: The new dentry of the file
1385 static int gfs2_rename(struct inode *odir, struct dentry *odentry,
1386 struct inode *ndir, struct dentry *ndentry)
1388 struct gfs2_inode *odip = GFS2_I(odir);
1389 struct gfs2_inode *ndip = GFS2_I(ndir);
1390 struct gfs2_inode *ip = GFS2_I(d_inode(odentry));
1391 struct gfs2_inode *nip = NULL;
1392 struct gfs2_sbd *sdp = GFS2_SB(odir);
1393 struct gfs2_holder ghs[4], r_gh, rd_gh;
1394 struct gfs2_rgrpd *nrgd;
1395 unsigned int num_gh;
1397 struct gfs2_diradd da = { .nr_blocks = 0, .save_loc = 0, };
1401 gfs2_holder_mark_uninitialized(&r_gh);
1402 gfs2_holder_mark_uninitialized(&rd_gh);
1403 if (d_really_is_positive(ndentry)) {
1404 nip = GFS2_I(d_inode(ndentry));
1409 error = gfs2_rindex_update(sdp);
1413 error = gfs2_qa_get(ndip);
1418 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1423 if (S_ISDIR(ip->i_inode.i_mode)) {
1425 /* don't move a directory into its subdir */
1426 error = gfs2_ok_to_move(ip, ndip);
1433 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs);
1435 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE,GL_ASYNC,
1439 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh);
1443 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC,
1448 for (x = 0; x < num_gh; x++) {
1449 error = gfs2_glock_nq(ghs + x);
1453 error = gfs2_glock_async_wait(num_gh, ghs);
1458 /* Grab the resource group glock for unlink flag twiddling.
1459 * This is the case where the target dinode already exists
1460 * so we unlink before doing the rename.
1462 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1);
1467 error = gfs2_glock_nq_init(nrgd->rd_gl, LM_ST_EXCLUSIVE,
1468 LM_FLAG_NODE_SCOPE, &rd_gh);
1474 if (ip->i_inode.i_nlink == 0)
1477 /* Check out the old directory */
1479 error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
1483 /* Check out the new directory */
1486 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1490 if (nip->i_inode.i_nlink == 0) {
1495 if (S_ISDIR(nip->i_inode.i_mode)) {
1496 if (nip->i_entries < 2) {
1497 gfs2_consist_inode(nip);
1501 if (nip->i_entries > 2) {
1507 error = gfs2_permission(&init_user_ns, ndir,
1508 MAY_WRITE | MAY_EXEC);
1512 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
1525 if (!ndip->i_inode.i_nlink) {
1529 if (ndip->i_entries == (u32)-1) {
1533 if (S_ISDIR(ip->i_inode.i_mode) &&
1534 ndip->i_inode.i_nlink == (u32)-1) {
1541 /* Check out the dir to be renamed */
1544 error = gfs2_permission(&init_user_ns, d_inode(odentry),
1551 error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da);
1557 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
1558 error = gfs2_quota_lock_check(ndip, &ap);
1562 error = gfs2_inplace_reserve(ndip, &ap);
1566 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) +
1567 4 * RES_LEAF + 4, 0);
1571 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
1572 5 * RES_LEAF + 4, 0);
1577 /* Remove the target file, if it exists */
1580 error = gfs2_unlink_inode(ndip, ndentry);
1582 error = update_moved_ino(ip, ndip, dir_rename);
1586 error = gfs2_dir_del(odip, odentry);
1590 error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da);
1595 gfs2_trans_end(sdp);
1598 gfs2_inplace_release(ndip);
1601 gfs2_quota_unlock(ndip);
1603 gfs2_dir_no_add(&da);
1604 if (gfs2_holder_initialized(&rd_gh))
1605 gfs2_glock_dq_uninit(&rd_gh);
1608 if (gfs2_holder_queued(ghs + x))
1609 gfs2_glock_dq(ghs + x);
1610 gfs2_holder_uninit(ghs + x);
1613 if (gfs2_holder_initialized(&r_gh))
1614 gfs2_glock_dq_uninit(&r_gh);
1621 * gfs2_exchange - exchange two files
1622 * @odir: Parent directory of old file name
1623 * @odentry: The old dentry of the file
1624 * @ndir: Parent directory of new file name
1625 * @ndentry: The new dentry of the file
1626 * @flags: The rename flags
1631 static int gfs2_exchange(struct inode *odir, struct dentry *odentry,
1632 struct inode *ndir, struct dentry *ndentry,
1635 struct gfs2_inode *odip = GFS2_I(odir);
1636 struct gfs2_inode *ndip = GFS2_I(ndir);
1637 struct gfs2_inode *oip = GFS2_I(odentry->d_inode);
1638 struct gfs2_inode *nip = GFS2_I(ndentry->d_inode);
1639 struct gfs2_sbd *sdp = GFS2_SB(odir);
1640 struct gfs2_holder ghs[4], r_gh;
1641 unsigned int num_gh;
1643 umode_t old_mode = oip->i_inode.i_mode;
1644 umode_t new_mode = nip->i_inode.i_mode;
1647 gfs2_holder_mark_uninitialized(&r_gh);
1648 error = gfs2_rindex_update(sdp);
1653 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1658 if (S_ISDIR(old_mode)) {
1659 /* don't move a directory into its subdir */
1660 error = gfs2_ok_to_move(oip, ndip);
1665 if (S_ISDIR(new_mode)) {
1666 /* don't move a directory into its subdir */
1667 error = gfs2_ok_to_move(nip, odip);
1674 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs);
1676 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC,
1680 gfs2_holder_init(oip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh);
1683 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh);
1686 for (x = 0; x < num_gh; x++) {
1687 error = gfs2_glock_nq(ghs + x);
1692 error = gfs2_glock_async_wait(num_gh, ghs);
1697 if (oip->i_inode.i_nlink == 0 || nip->i_inode.i_nlink == 0)
1700 error = gfs2_unlink_ok(odip, &odentry->d_name, oip);
1703 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1707 if (S_ISDIR(old_mode)) {
1708 error = gfs2_permission(&init_user_ns, odentry->d_inode,
1713 if (S_ISDIR(new_mode)) {
1714 error = gfs2_permission(&init_user_ns, ndentry->d_inode,
1719 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 4 * RES_LEAF, 0);
1723 error = update_moved_ino(oip, ndip, S_ISDIR(old_mode));
1727 error = update_moved_ino(nip, odip, S_ISDIR(new_mode));
1731 error = gfs2_dir_mvino(ndip, &ndentry->d_name, oip,
1736 error = gfs2_dir_mvino(odip, &odentry->d_name, nip,
1742 if (S_ISDIR(new_mode) && !S_ISDIR(old_mode)) {
1743 inc_nlink(&odip->i_inode);
1744 drop_nlink(&ndip->i_inode);
1745 } else if (S_ISDIR(old_mode) && !S_ISDIR(new_mode)) {
1746 inc_nlink(&ndip->i_inode);
1747 drop_nlink(&odip->i_inode);
1750 mark_inode_dirty(&ndip->i_inode);
1752 mark_inode_dirty(&odip->i_inode);
1755 gfs2_trans_end(sdp);
1758 if (gfs2_holder_queued(ghs + x))
1759 gfs2_glock_dq(ghs + x);
1760 gfs2_holder_uninit(ghs + x);
1763 if (gfs2_holder_initialized(&r_gh))
1764 gfs2_glock_dq_uninit(&r_gh);
1769 static int gfs2_rename2(struct user_namespace *mnt_userns, struct inode *odir,
1770 struct dentry *odentry, struct inode *ndir,
1771 struct dentry *ndentry, unsigned int flags)
1773 flags &= ~RENAME_NOREPLACE;
1775 if (flags & ~RENAME_EXCHANGE)
1778 if (flags & RENAME_EXCHANGE)
1779 return gfs2_exchange(odir, odentry, ndir, ndentry, flags);
1781 return gfs2_rename(odir, odentry, ndir, ndentry);
1785 * gfs2_get_link - Follow a symbolic link
1786 * @dentry: The dentry of the link
1787 * @inode: The inode of the link
1788 * @done: destructor for return value
1790 * This can handle symlinks of any size.
1792 * Returns: 0 on success or error code
1795 static const char *gfs2_get_link(struct dentry *dentry,
1796 struct inode *inode,
1797 struct delayed_call *done)
1799 struct gfs2_inode *ip = GFS2_I(inode);
1800 struct gfs2_holder i_gh;
1801 struct buffer_head *dibh;
1807 return ERR_PTR(-ECHILD);
1809 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1810 error = gfs2_glock_nq(&i_gh);
1812 gfs2_holder_uninit(&i_gh);
1813 return ERR_PTR(error);
1816 size = (unsigned int)i_size_read(&ip->i_inode);
1818 gfs2_consist_inode(ip);
1819 buf = ERR_PTR(-EIO);
1823 error = gfs2_meta_inode_buffer(ip, &dibh);
1825 buf = ERR_PTR(error);
1829 buf = kzalloc(size + 1, GFP_NOFS);
1831 buf = ERR_PTR(-ENOMEM);
1833 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
1836 gfs2_glock_dq_uninit(&i_gh);
1838 set_delayed_call(done, kfree_link, buf);
1844 * @mnt_userns: User namespace of the mount the inode was found from
1846 * @mask: The mask to be tested
1848 * This may be called from the VFS directly, or from within GFS2 with the
1849 * inode locked, so we look to see if the glock is already locked and only
1850 * lock the glock if its not already been done.
1855 int gfs2_permission(struct user_namespace *mnt_userns, struct inode *inode,
1858 struct gfs2_inode *ip;
1859 struct gfs2_holder i_gh;
1862 gfs2_holder_mark_uninitialized(&i_gh);
1864 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1865 if (mask & MAY_NOT_BLOCK)
1867 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1872 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1875 error = generic_permission(&init_user_ns, inode, mask);
1876 if (gfs2_holder_initialized(&i_gh))
1877 gfs2_glock_dq_uninit(&i_gh);
1882 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1884 setattr_copy(&init_user_ns, inode, attr);
1885 mark_inode_dirty(inode);
1889 static int gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1893 if (current->journal_info)
1894 return __gfs2_setattr_simple(inode, attr);
1896 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0);
1900 error = __gfs2_setattr_simple(inode, attr);
1901 gfs2_trans_end(GFS2_SB(inode));
1905 static int setattr_chown(struct inode *inode, struct iattr *attr)
1907 struct gfs2_inode *ip = GFS2_I(inode);
1908 struct gfs2_sbd *sdp = GFS2_SB(inode);
1912 struct gfs2_alloc_parms ap;
1914 ouid = inode->i_uid;
1915 ogid = inode->i_gid;
1916 nuid = attr->ia_uid;
1917 ngid = attr->ia_gid;
1919 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid))
1920 ouid = nuid = NO_UID_QUOTA_CHANGE;
1921 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid))
1922 ogid = ngid = NO_GID_QUOTA_CHANGE;
1923 error = gfs2_qa_get(ip);
1927 error = gfs2_rindex_update(sdp);
1931 error = gfs2_quota_lock(ip, nuid, ngid);
1935 ap.target = gfs2_get_inode_blocks(&ip->i_inode);
1937 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1938 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1939 error = gfs2_quota_check(ip, nuid, ngid, &ap);
1944 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1948 error = gfs2_setattr_simple(inode, attr);
1952 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1953 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1954 gfs2_quota_change(ip, -(s64)ap.target, ouid, ogid);
1955 gfs2_quota_change(ip, ap.target, nuid, ngid);
1959 gfs2_trans_end(sdp);
1961 gfs2_quota_unlock(ip);
1968 * gfs2_setattr - Change attributes on an inode
1969 * @mnt_userns: User namespace of the mount the inode was found from
1970 * @dentry: The dentry which is changing
1971 * @attr: The structure describing the change
1973 * The VFS layer wants to change one or more of an inodes attributes. Write
1974 * that change out to disk.
1979 static int gfs2_setattr(struct user_namespace *mnt_userns,
1980 struct dentry *dentry, struct iattr *attr)
1982 struct inode *inode = d_inode(dentry);
1983 struct gfs2_inode *ip = GFS2_I(inode);
1984 struct gfs2_holder i_gh;
1987 error = gfs2_qa_get(ip);
1991 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1995 error = may_setattr(&init_user_ns, inode, attr->ia_valid);
1999 error = setattr_prepare(&init_user_ns, dentry, attr);
2003 if (attr->ia_valid & ATTR_SIZE)
2004 error = gfs2_setattr_size(inode, attr->ia_size);
2005 else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
2006 error = setattr_chown(inode, attr);
2008 error = gfs2_setattr_simple(inode, attr);
2009 if (!error && attr->ia_valid & ATTR_MODE)
2010 error = posix_acl_chmod(&init_user_ns, dentry,
2016 mark_inode_dirty(inode);
2017 gfs2_glock_dq_uninit(&i_gh);
2024 * gfs2_getattr - Read out an inode's attributes
2025 * @mnt_userns: user namespace of the mount the inode was found from
2026 * @path: Object to query
2027 * @stat: The inode's stats
2028 * @request_mask: Mask of STATX_xxx flags indicating the caller's interests
2029 * @flags: AT_STATX_xxx setting
2031 * This may be called from the VFS directly, or from within GFS2 with the
2032 * inode locked, so we look to see if the glock is already locked and only
2033 * lock the glock if its not already been done. Note that its the NFS
2034 * readdirplus operation which causes this to be called (from filldir)
2035 * with the glock already held.
2040 static int gfs2_getattr(struct user_namespace *mnt_userns,
2041 const struct path *path, struct kstat *stat,
2042 u32 request_mask, unsigned int flags)
2044 struct inode *inode = d_inode(path->dentry);
2045 struct gfs2_inode *ip = GFS2_I(inode);
2046 struct gfs2_holder gh;
2050 gfs2_holder_mark_uninitialized(&gh);
2051 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
2052 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
2057 gfsflags = ip->i_diskflags;
2058 if (gfsflags & GFS2_DIF_APPENDONLY)
2059 stat->attributes |= STATX_ATTR_APPEND;
2060 if (gfsflags & GFS2_DIF_IMMUTABLE)
2061 stat->attributes |= STATX_ATTR_IMMUTABLE;
2063 stat->attributes_mask |= (STATX_ATTR_APPEND |
2064 STATX_ATTR_COMPRESSED |
2065 STATX_ATTR_ENCRYPTED |
2066 STATX_ATTR_IMMUTABLE |
2069 generic_fillattr(&init_user_ns, inode, stat);
2071 if (gfs2_holder_initialized(&gh))
2072 gfs2_glock_dq_uninit(&gh);
2077 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
2080 struct gfs2_inode *ip = GFS2_I(inode);
2081 struct gfs2_holder gh;
2084 inode_lock_shared(inode);
2086 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2090 ret = iomap_fiemap(inode, fieinfo, start, len, &gfs2_iomap_ops);
2092 gfs2_glock_dq_uninit(&gh);
2095 inode_unlock_shared(inode);
2099 loff_t gfs2_seek_data(struct file *file, loff_t offset)
2101 struct inode *inode = file->f_mapping->host;
2102 struct gfs2_inode *ip = GFS2_I(inode);
2103 struct gfs2_holder gh;
2106 inode_lock_shared(inode);
2107 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2109 ret = iomap_seek_data(inode, offset, &gfs2_iomap_ops);
2110 gfs2_glock_dq_uninit(&gh);
2111 inode_unlock_shared(inode);
2115 return vfs_setpos(file, ret, inode->i_sb->s_maxbytes);
2118 loff_t gfs2_seek_hole(struct file *file, loff_t offset)
2120 struct inode *inode = file->f_mapping->host;
2121 struct gfs2_inode *ip = GFS2_I(inode);
2122 struct gfs2_holder gh;
2125 inode_lock_shared(inode);
2126 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2128 ret = iomap_seek_hole(inode, offset, &gfs2_iomap_ops);
2129 gfs2_glock_dq_uninit(&gh);
2130 inode_unlock_shared(inode);
2134 return vfs_setpos(file, ret, inode->i_sb->s_maxbytes);
2137 static int gfs2_update_time(struct inode *inode, struct timespec64 *time,
2140 struct gfs2_inode *ip = GFS2_I(inode);
2141 struct gfs2_glock *gl = ip->i_gl;
2142 struct gfs2_holder *gh;
2145 gh = gfs2_glock_is_locked_by_me(gl);
2146 if (gh && !gfs2_glock_is_held_excl(gl)) {
2148 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, gh);
2149 error = gfs2_glock_nq(gh);
2153 return generic_update_time(inode, time, flags);
2156 static const struct inode_operations gfs2_file_iops = {
2157 .permission = gfs2_permission,
2158 .setattr = gfs2_setattr,
2159 .getattr = gfs2_getattr,
2160 .listxattr = gfs2_listxattr,
2161 .fiemap = gfs2_fiemap,
2162 .get_inode_acl = gfs2_get_acl,
2163 .set_acl = gfs2_set_acl,
2164 .update_time = gfs2_update_time,
2165 .fileattr_get = gfs2_fileattr_get,
2166 .fileattr_set = gfs2_fileattr_set,
2169 static const struct inode_operations gfs2_dir_iops = {
2170 .create = gfs2_create,
2171 .lookup = gfs2_lookup,
2173 .unlink = gfs2_unlink,
2174 .symlink = gfs2_symlink,
2175 .mkdir = gfs2_mkdir,
2176 .rmdir = gfs2_unlink,
2177 .mknod = gfs2_mknod,
2178 .rename = gfs2_rename2,
2179 .permission = gfs2_permission,
2180 .setattr = gfs2_setattr,
2181 .getattr = gfs2_getattr,
2182 .listxattr = gfs2_listxattr,
2183 .fiemap = gfs2_fiemap,
2184 .get_inode_acl = gfs2_get_acl,
2185 .set_acl = gfs2_set_acl,
2186 .update_time = gfs2_update_time,
2187 .atomic_open = gfs2_atomic_open,
2188 .fileattr_get = gfs2_fileattr_get,
2189 .fileattr_set = gfs2_fileattr_set,
2192 static const struct inode_operations gfs2_symlink_iops = {
2193 .get_link = gfs2_get_link,
2194 .permission = gfs2_permission,
2195 .setattr = gfs2_setattr,
2196 .getattr = gfs2_getattr,
2197 .listxattr = gfs2_listxattr,
2198 .fiemap = gfs2_fiemap,