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_set_atime(inode,
189 1LL << (8 * sizeof(inode_get_atime_sec(inode)) - 1),
192 glock_set_object(ip->i_gl, ip);
194 if (type == DT_UNKNOWN) {
195 /* Inode glock must be locked already */
196 error = gfs2_instantiate(&i_gh);
198 glock_clear_object(ip->i_gl, ip);
202 ip->i_no_formal_ino = no_formal_ino;
203 inode->i_mode = DT2IF(type);
206 if (gfs2_holder_initialized(&i_gh))
207 gfs2_glock_dq_uninit(&i_gh);
208 glock_set_object(ip->i_iopen_gh.gh_gl, ip);
211 unlock_new_inode(inode);
214 if (no_formal_ino && ip->i_no_formal_ino &&
215 no_formal_ino != ip->i_no_formal_ino) {
217 return ERR_PTR(-ESTALE);
223 if (error == GLR_TRYFAILED)
225 if (gfs2_holder_initialized(&ip->i_iopen_gh))
226 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
227 if (gfs2_holder_initialized(&i_gh))
228 gfs2_glock_dq_uninit(&i_gh);
230 gfs2_glock_put(ip->i_gl);
234 return ERR_PTR(error);
238 * gfs2_lookup_by_inum - look up an inode by inode number
239 * @sdp: The super block
240 * @no_addr: The inode number
241 * @no_formal_ino: The inode generation number (0 for any)
242 * @blktype: Requested block type (see gfs2_inode_lookup)
244 struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr,
245 u64 no_formal_ino, unsigned int blktype)
247 struct super_block *sb = sdp->sd_vfs;
251 inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, no_formal_ino,
258 if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM)
265 return ERR_PTR(error);
270 * gfs2_lookup_meta - Look up an inode in a metadata directory
271 * @dip: The directory
272 * @name: The name of the inode
274 struct inode *gfs2_lookup_meta(struct inode *dip, const char *name)
279 gfs2_str2qstr(&qstr, name);
280 inode = gfs2_lookupi(dip, &qstr, 1);
281 if (IS_ERR_OR_NULL(inode))
282 return inode ? inode : ERR_PTR(-ENOENT);
285 * Must not call back into the filesystem when allocating
286 * pages in the metadata inode's address space.
288 mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
295 * gfs2_lookupi - Look up a filename in a directory and return its inode
296 * @dir: The inode of the directory containing the inode to look-up
297 * @name: The name of the inode to look for
298 * @is_root: If 1, ignore the caller's permissions
300 * This can be called via the VFS filldir function when NFS is doing
301 * a readdirplus and the inode which its intending to stat isn't
302 * already in cache. In this case we must not take the directory glock
303 * again, since the readdir call will have already taken that lock.
308 struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
311 struct super_block *sb = dir->i_sb;
312 struct gfs2_inode *dip = GFS2_I(dir);
313 struct gfs2_holder d_gh;
315 struct inode *inode = NULL;
317 gfs2_holder_mark_uninitialized(&d_gh);
318 if (!name->len || name->len > GFS2_FNAMESIZE)
319 return ERR_PTR(-ENAMETOOLONG);
321 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
322 (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
323 dir == d_inode(sb->s_root))) {
328 if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) {
329 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
331 return ERR_PTR(error);
335 error = gfs2_permission(&nop_mnt_idmap, dir, MAY_EXEC);
340 inode = gfs2_dir_search(dir, name, false);
342 error = PTR_ERR(inode);
344 if (gfs2_holder_initialized(&d_gh))
345 gfs2_glock_dq_uninit(&d_gh);
346 if (error == -ENOENT)
348 return inode ? inode : ERR_PTR(error);
352 * create_ok - OK to create a new on-disk inode here?
353 * @dip: Directory in which dinode is to be created
354 * @name: Name of new dinode
360 static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
365 error = gfs2_permission(&nop_mnt_idmap, &dip->i_inode,
366 MAY_WRITE | MAY_EXEC);
370 /* Don't create entries in an unlinked directory */
371 if (!dip->i_inode.i_nlink)
374 if (dip->i_entries == (u32)-1)
376 if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1)
382 static void munge_mode_uid_gid(const struct gfs2_inode *dip,
385 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
386 (dip->i_inode.i_mode & S_ISUID) &&
387 !uid_eq(dip->i_inode.i_uid, GLOBAL_ROOT_UID)) {
388 if (S_ISDIR(inode->i_mode))
389 inode->i_mode |= S_ISUID;
390 else if (!uid_eq(dip->i_inode.i_uid, current_fsuid()))
391 inode->i_mode &= ~07111;
392 inode->i_uid = dip->i_inode.i_uid;
394 inode->i_uid = current_fsuid();
396 if (dip->i_inode.i_mode & S_ISGID) {
397 if (S_ISDIR(inode->i_mode))
398 inode->i_mode |= S_ISGID;
399 inode->i_gid = dip->i_inode.i_gid;
401 inode->i_gid = current_fsgid();
404 static int alloc_dinode(struct gfs2_inode *ip, u32 flags, unsigned *dblocks)
406 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
407 struct gfs2_alloc_parms ap = { .target = *dblocks, .aflags = flags, };
410 error = gfs2_quota_lock_check(ip, &ap);
414 error = gfs2_inplace_reserve(ip, &ap);
418 error = gfs2_trans_begin(sdp, (*dblocks * RES_RG_BIT) + RES_STATFS + RES_QUOTA, 0);
422 error = gfs2_alloc_blocks(ip, &ip->i_no_addr, dblocks, 1);
426 ip->i_no_formal_ino = ip->i_generation;
427 ip->i_inode.i_ino = ip->i_no_addr;
428 ip->i_goal = ip->i_no_addr;
430 ip->i_eattr = ip->i_no_addr + 1;
435 gfs2_inplace_release(ip);
437 gfs2_quota_unlock(ip);
442 static void gfs2_init_dir(struct buffer_head *dibh,
443 const struct gfs2_inode *parent)
445 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
446 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
448 gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent);
449 dent->de_inum = di->di_num; /* already GFS2 endian */
450 dent->de_type = cpu_to_be16(DT_DIR);
452 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
453 gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
454 gfs2_inum_out(parent, dent);
455 dent->de_type = cpu_to_be16(DT_DIR);
460 * gfs2_init_xattr - Initialise an xattr block for a new inode
461 * @ip: The inode in question
463 * This sets up an empty xattr block for a new inode, ready to
464 * take any ACLs, LSM xattrs, etc.
467 static void gfs2_init_xattr(struct gfs2_inode *ip)
469 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
470 struct buffer_head *bh;
471 struct gfs2_ea_header *ea;
473 bh = gfs2_meta_new(ip->i_gl, ip->i_eattr);
474 gfs2_trans_add_meta(ip->i_gl, bh);
475 gfs2_metatype_set(bh, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
476 gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header));
478 ea = GFS2_EA_BH2FIRST(bh);
479 ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
480 ea->ea_type = GFS2_EATYPE_UNUSED;
481 ea->ea_flags = GFS2_EAFLAG_LAST;
487 * init_dinode - Fill in a new dinode structure
488 * @dip: The directory this inode is being created in
490 * @symname: The symlink destination (if a symlink)
494 static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip,
497 struct gfs2_dinode *di;
498 struct buffer_head *dibh;
500 dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr);
501 gfs2_trans_add_meta(ip->i_gl, dibh);
502 di = (struct gfs2_dinode *)dibh->b_data;
503 gfs2_dinode_out(ip, di);
505 di->di_major = cpu_to_be32(imajor(&ip->i_inode));
506 di->di_minor = cpu_to_be32(iminor(&ip->i_inode));
510 memset(&di->__pad4, 0, sizeof(di->__pad4));
511 memset(&di->di_reserved, 0, sizeof(di->di_reserved));
512 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
514 switch(ip->i_inode.i_mode & S_IFMT) {
516 gfs2_init_dir(dibh, dip);
519 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size);
523 set_buffer_uptodate(dibh);
528 * gfs2_trans_da_blks - Calculate number of blocks to link inode
529 * @dip: The directory we are linking into
530 * @da: The dir add information
531 * @nr_inodes: The number of inodes involved
533 * This calculate the number of blocks we need to reserve in a
534 * transaction to link @nr_inodes into a directory. In most cases
535 * @nr_inodes will be 2 (the directory plus the inode being linked in)
536 * but in case of rename, 4 may be required.
538 * Returns: Number of blocks
541 static unsigned gfs2_trans_da_blks(const struct gfs2_inode *dip,
542 const struct gfs2_diradd *da,
545 return da->nr_blocks + gfs2_rg_blocks(dip, da->nr_blocks) +
546 (nr_inodes * RES_DINODE) + RES_QUOTA + RES_STATFS;
549 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
550 struct gfs2_inode *ip, struct gfs2_diradd *da)
552 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
553 struct gfs2_alloc_parms ap = { .target = da->nr_blocks, };
557 error = gfs2_quota_lock_check(dip, &ap);
559 goto fail_quota_locks;
561 error = gfs2_inplace_reserve(dip, &ap);
563 goto fail_quota_locks;
565 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, da, 2), 0);
569 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
571 goto fail_quota_locks;
574 error = gfs2_dir_add(&dip->i_inode, name, ip, da);
578 gfs2_inplace_release(dip);
580 gfs2_quota_unlock(dip);
584 static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
587 const struct xattr *xattr;
590 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
591 err = __gfs2_xattr_set(inode, xattr->name, xattr->value,
593 GFS2_EATYPE_SECURITY);
601 * gfs2_create_inode - Create a new inode
602 * @dir: The parent directory
603 * @dentry: The new dentry
604 * @file: If non-NULL, the file which is being opened
605 * @mode: The permissions on the new inode
606 * @dev: For device nodes, this is the device number
607 * @symname: For symlinks, this is the link destination
608 * @size: The initial size of the inode (ignored for directories)
609 * @excl: Force fail if inode exists
611 * FIXME: Change to allocate the disk blocks and write them out in the same
612 * transaction. That way, we can no longer end up in a situation in which an
613 * inode is allocated, the node crashes, and the block looks like a valid
614 * inode. (With atomic creates in place, we will also no longer need to zero
615 * the link count and dirty the inode here on failure.)
617 * Returns: 0 on success, or error code
620 static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
622 umode_t mode, dev_t dev, const char *symname,
623 unsigned int size, int excl)
625 const struct qstr *name = &dentry->d_name;
626 struct posix_acl *default_acl, *acl;
627 struct gfs2_holder d_gh, gh;
628 struct inode *inode = NULL;
629 struct gfs2_inode *dip = GFS2_I(dir), *ip;
630 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
631 struct gfs2_glock *io_gl;
635 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
637 if (!name->len || name->len > GFS2_FNAMESIZE)
638 return -ENAMETOOLONG;
640 error = gfs2_qa_get(dip);
644 error = gfs2_rindex_update(sdp);
648 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, &d_gh);
651 gfs2_holder_mark_uninitialized(&gh);
653 error = create_ok(dip, name, mode);
657 inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl);
658 error = PTR_ERR(inode);
659 if (!IS_ERR(inode)) {
660 if (S_ISDIR(inode->i_mode)) {
662 inode = ERR_PTR(-EISDIR);
665 d_instantiate(dentry, inode);
668 if (S_ISREG(inode->i_mode))
669 error = finish_open(file, dentry, gfs2_open_common);
671 error = finish_no_open(file, NULL);
673 gfs2_glock_dq_uninit(&d_gh);
675 } else if (error != -ENOENT) {
679 error = gfs2_diradd_alloc_required(dir, name, &da);
683 inode = new_inode(sdp->sd_vfs);
689 error = posix_acl_create(dir, &mode, &default_acl, &acl);
693 error = gfs2_qa_get(ip);
697 inode->i_mode = mode;
698 set_nlink(inode, S_ISDIR(mode) ? 2 : 1);
700 inode->i_size = size;
701 simple_inode_init_ts(inode);
702 munge_mode_uid_gid(dip, inode);
703 check_and_update_goal(dip);
704 ip->i_goal = dip->i_goal;
710 ip->i_no_addr = 0; /* Temporarily zero until real addr is assigned */
712 switch(mode & S_IFMT) {
714 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) ||
715 gfs2_tune_get(sdp, gt_new_files_jdata))
716 ip->i_diskflags |= GFS2_DIF_JDATA;
717 gfs2_set_aops(inode);
720 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA);
721 ip->i_diskflags |= GFS2_DIF_JDATA;
726 /* Force SYSTEM flag on all files and subdirs of a SYSTEM directory */
727 if (dip->i_diskflags & GFS2_DIF_SYSTEM)
728 ip->i_diskflags |= GFS2_DIF_SYSTEM;
730 gfs2_set_inode_flags(inode);
732 if ((GFS2_I(d_inode(sdp->sd_root_dir)) == dip) ||
733 (dip->i_diskflags & GFS2_DIF_TOPDIR))
734 aflags |= GFS2_AF_ORLOV;
736 if (default_acl || acl)
739 error = alloc_dinode(ip, aflags, &blocks);
741 goto fail_free_inode;
743 gfs2_set_inode_blocks(inode, blocks);
745 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
747 goto fail_free_inode;
749 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
751 goto fail_free_inode;
752 gfs2_cancel_delete_work(io_gl);
755 error = insert_inode_locked4(inode, ip->i_no_addr, iget_test, &ip->i_no_addr);
761 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT | GL_NOPID,
766 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, &gh);
770 error = gfs2_trans_begin(sdp, blocks, 0);
776 init_dinode(dip, ip, symname);
779 glock_set_object(ip->i_gl, ip);
780 glock_set_object(io_gl, ip);
784 error = __gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
787 posix_acl_release(default_acl);
791 error = __gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS);
794 posix_acl_release(acl);
798 error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name,
799 &gfs2_initxattrs, NULL);
803 error = link_dinode(dip, name, ip, &da);
807 mark_inode_dirty(inode);
808 d_instantiate(dentry, inode);
809 /* After instantiate, errors should result in evict which will destroy
810 * both inode and iopen glocks properly. */
812 file->f_mode |= FMODE_CREATED;
813 error = finish_open(file, dentry, gfs2_open_common);
815 gfs2_glock_dq_uninit(&d_gh);
817 gfs2_glock_dq_uninit(&gh);
818 gfs2_glock_put(io_gl);
820 unlock_new_inode(inode);
824 glock_clear_object(ip->i_gl, ip);
825 glock_clear_object(io_gl, ip);
827 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
829 gfs2_glock_put(io_gl);
832 gfs2_glock_put(ip->i_gl);
835 gfs2_rs_deltree(&ip->i_res);
838 posix_acl_release(default_acl);
839 posix_acl_release(acl);
841 gfs2_dir_no_add(&da);
842 gfs2_glock_dq_uninit(&d_gh);
843 if (!IS_ERR_OR_NULL(inode)) {
844 set_bit(GIF_ALLOC_FAILED, &ip->i_flags);
847 mark_inode_dirty(inode);
848 if (inode->i_state & I_NEW)
853 if (gfs2_holder_initialized(&gh))
854 gfs2_glock_dq_uninit(&gh);
861 * gfs2_create - Create a file
862 * @idmap: idmap of the mount the inode was found from
863 * @dir: The directory in which to create the file
864 * @dentry: The dentry of the new file
865 * @mode: The mode of the new file
866 * @excl: Force fail if inode exists
871 static int gfs2_create(struct mnt_idmap *idmap, struct inode *dir,
872 struct dentry *dentry, umode_t mode, bool excl)
874 return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl);
878 * __gfs2_lookup - Look up a filename in a directory and return its inode
879 * @dir: The directory inode
880 * @dentry: The dentry of the new inode
881 * @file: File to be opened
887 static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry,
892 struct gfs2_holder gh;
893 struct gfs2_glock *gl;
896 inode = gfs2_lookupi(dir, &dentry->d_name, 0);
902 return ERR_CAST(inode);
904 gl = GFS2_I(inode)->i_gl;
905 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
908 return ERR_PTR(error);
911 d = d_splice_alias(inode, dentry);
913 gfs2_glock_dq_uninit(&gh);
916 if (file && S_ISREG(inode->i_mode))
917 error = finish_open(file, dentry, gfs2_open_common);
919 gfs2_glock_dq_uninit(&gh);
922 return ERR_PTR(error);
927 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
930 return __gfs2_lookup(dir, dentry, NULL);
934 * gfs2_link - Link to a file
935 * @old_dentry: The inode to link
936 * @dir: Add link to this directory
937 * @dentry: The name of the link
939 * Link the inode in "old_dentry" into the directory "dir" with the
945 static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
946 struct dentry *dentry)
948 struct gfs2_inode *dip = GFS2_I(dir);
949 struct gfs2_sbd *sdp = GFS2_SB(dir);
950 struct inode *inode = d_inode(old_dentry);
951 struct gfs2_inode *ip = GFS2_I(inode);
952 struct gfs2_holder d_gh, gh;
953 struct buffer_head *dibh;
954 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
957 if (S_ISDIR(inode->i_mode))
960 error = gfs2_qa_get(dip);
964 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, &d_gh);
965 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
967 error = gfs2_glock_nq(&d_gh);
971 error = gfs2_glock_nq(&gh);
976 if (inode->i_nlink == 0)
979 error = gfs2_permission(&nop_mnt_idmap, dir, MAY_WRITE | MAY_EXEC);
983 error = gfs2_dir_check(dir, &dentry->d_name, NULL);
995 if (!dip->i_inode.i_nlink)
998 if (dip->i_entries == (u32)-1)
1001 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1004 if (ip->i_inode.i_nlink == (u32)-1)
1007 error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da);
1012 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
1013 error = gfs2_quota_lock_check(dip, &ap);
1017 error = gfs2_inplace_reserve(dip, &ap);
1021 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0);
1025 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
1030 error = gfs2_meta_inode_buffer(ip, &dibh);
1034 error = gfs2_dir_add(dir, &dentry->d_name, ip, &da);
1038 gfs2_trans_add_meta(ip->i_gl, dibh);
1039 inc_nlink(&ip->i_inode);
1040 inode_set_ctime_current(&ip->i_inode);
1042 d_instantiate(dentry, inode);
1043 mark_inode_dirty(inode);
1048 gfs2_trans_end(sdp);
1051 gfs2_inplace_release(dip);
1054 gfs2_quota_unlock(dip);
1056 gfs2_dir_no_add(&da);
1059 gfs2_glock_dq(&d_gh);
1062 gfs2_holder_uninit(&d_gh);
1063 gfs2_holder_uninit(&gh);
1068 * gfs2_unlink_ok - check to see that a inode is still in a directory
1069 * @dip: the directory
1070 * @name: the name of the file
1073 * Assumes that the lock on (at least) @dip is held.
1075 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
1078 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
1079 const struct gfs2_inode *ip)
1083 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
1086 if ((dip->i_inode.i_mode & S_ISVTX) &&
1087 !uid_eq(dip->i_inode.i_uid, current_fsuid()) &&
1088 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER))
1091 if (IS_APPEND(&dip->i_inode))
1094 error = gfs2_permission(&nop_mnt_idmap, &dip->i_inode,
1095 MAY_WRITE | MAY_EXEC);
1099 return gfs2_dir_check(&dip->i_inode, name, ip);
1103 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it
1104 * @dip: The parent directory
1105 * @dentry: The dentry to unlink
1107 * Called with all the locks and in a transaction. This will only be
1108 * called for a directory after it has been checked to ensure it is empty.
1110 * Returns: 0 on success, or an error
1113 static int gfs2_unlink_inode(struct gfs2_inode *dip,
1114 const struct dentry *dentry)
1116 struct inode *inode = d_inode(dentry);
1117 struct gfs2_inode *ip = GFS2_I(inode);
1120 error = gfs2_dir_del(dip, dentry);
1125 inode_set_ctime_current(inode);
1126 if (S_ISDIR(inode->i_mode))
1130 mark_inode_dirty(inode);
1131 if (inode->i_nlink == 0)
1132 gfs2_unlink_di(inode);
1138 * gfs2_unlink - Unlink an inode (this does rmdir as well)
1139 * @dir: The inode of the directory containing the inode to unlink
1140 * @dentry: The file itself
1142 * This routine uses the type of the inode as a flag to figure out
1143 * whether this is an unlink or an rmdir.
1148 static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
1150 struct gfs2_inode *dip = GFS2_I(dir);
1151 struct gfs2_sbd *sdp = GFS2_SB(dir);
1152 struct inode *inode = d_inode(dentry);
1153 struct gfs2_inode *ip = GFS2_I(inode);
1154 struct gfs2_holder d_gh, r_gh, gh;
1155 struct gfs2_rgrpd *rgd;
1158 error = gfs2_rindex_update(sdp);
1164 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, &d_gh);
1165 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1167 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1171 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, LM_FLAG_NODE_SCOPE, &r_gh);
1174 error = gfs2_glock_nq(&d_gh);
1178 error = gfs2_glock_nq(&gh);
1183 if (inode->i_nlink == 0)
1186 if (S_ISDIR(inode->i_mode)) {
1188 if (ip->i_entries > 2 || inode->i_nlink > 2)
1192 error = gfs2_glock_nq(&r_gh); /* rgrp */
1196 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
1200 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0);
1204 error = gfs2_unlink_inode(dip, dentry);
1205 gfs2_trans_end(sdp);
1208 gfs2_glock_dq(&r_gh);
1212 gfs2_glock_dq(&d_gh);
1214 gfs2_holder_uninit(&r_gh);
1216 gfs2_holder_uninit(&gh);
1217 gfs2_holder_uninit(&d_gh);
1222 * gfs2_symlink - Create a symlink
1223 * @idmap: idmap of the mount the inode was found from
1224 * @dir: The directory to create the symlink in
1225 * @dentry: The dentry to put the symlink in
1226 * @symname: The thing which the link points to
1231 static int gfs2_symlink(struct mnt_idmap *idmap, struct inode *dir,
1232 struct dentry *dentry, const char *symname)
1236 size = strlen(symname);
1237 if (size >= gfs2_max_stuffed_size(GFS2_I(dir)))
1238 return -ENAMETOOLONG;
1240 return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0);
1244 * gfs2_mkdir - Make a directory
1245 * @idmap: idmap of the mount the inode was found from
1246 * @dir: The parent directory of the new one
1247 * @dentry: The dentry of the new directory
1248 * @mode: The mode of the new directory
1253 static int gfs2_mkdir(struct mnt_idmap *idmap, struct inode *dir,
1254 struct dentry *dentry, umode_t mode)
1256 unsigned dsize = gfs2_max_stuffed_size(GFS2_I(dir));
1257 return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0);
1261 * gfs2_mknod - Make a special file
1262 * @idmap: idmap of the mount the inode was found from
1263 * @dir: The directory in which the special file will reside
1264 * @dentry: The dentry of the special file
1265 * @mode: The mode of the special file
1266 * @dev: The device specification of the special file
1270 static int gfs2_mknod(struct mnt_idmap *idmap, struct inode *dir,
1271 struct dentry *dentry, umode_t mode, dev_t dev)
1273 return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0);
1277 * gfs2_atomic_open - Atomically open a file
1278 * @dir: The directory
1279 * @dentry: The proposed new entry
1280 * @file: The proposed new struct file
1281 * @flags: open flags
1284 * Returns: error code or 0 for success
1287 static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry,
1288 struct file *file, unsigned flags,
1292 bool excl = !!(flags & O_EXCL);
1294 if (!d_in_lookup(dentry))
1297 d = __gfs2_lookup(dir, dentry, file);
1302 if (d_really_is_positive(dentry)) {
1303 if (!(file->f_mode & FMODE_OPENED))
1304 return finish_no_open(file, d);
1306 return excl && (flags & O_CREAT) ? -EEXIST : 0;
1312 if (!(flags & O_CREAT))
1315 return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl);
1319 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1323 * Follow @to back to the root and make sure we don't encounter @this
1324 * Assumes we already hold the rename lock.
1329 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1331 struct inode *dir = &to->i_inode;
1332 struct super_block *sb = dir->i_sb;
1339 if (dir == &this->i_inode) {
1343 if (dir == d_inode(sb->s_root)) {
1348 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
1354 error = PTR_ERR(tmp);
1368 * update_moved_ino - Update an inode that's being moved
1369 * @ip: The inode being moved
1370 * @ndip: The parent directory of the new filename
1371 * @dir_rename: True of ip is a directory
1376 static int update_moved_ino(struct gfs2_inode *ip, struct gfs2_inode *ndip,
1380 return gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);
1382 inode_set_ctime_current(&ip->i_inode);
1383 mark_inode_dirty_sync(&ip->i_inode);
1389 * gfs2_rename - Rename a file
1390 * @odir: Parent directory of old file name
1391 * @odentry: The old dentry of the file
1392 * @ndir: Parent directory of new file name
1393 * @ndentry: The new dentry of the file
1398 static int gfs2_rename(struct inode *odir, struct dentry *odentry,
1399 struct inode *ndir, struct dentry *ndentry)
1401 struct gfs2_inode *odip = GFS2_I(odir);
1402 struct gfs2_inode *ndip = GFS2_I(ndir);
1403 struct gfs2_inode *ip = GFS2_I(d_inode(odentry));
1404 struct gfs2_inode *nip = NULL;
1405 struct gfs2_sbd *sdp = GFS2_SB(odir);
1406 struct gfs2_holder ghs[4], r_gh, rd_gh;
1407 struct gfs2_rgrpd *nrgd;
1408 unsigned int num_gh;
1410 struct gfs2_diradd da = { .nr_blocks = 0, .save_loc = 0, };
1414 gfs2_holder_mark_uninitialized(&r_gh);
1415 gfs2_holder_mark_uninitialized(&rd_gh);
1416 if (d_really_is_positive(ndentry)) {
1417 nip = GFS2_I(d_inode(ndentry));
1422 error = gfs2_rindex_update(sdp);
1426 error = gfs2_qa_get(ndip);
1431 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1436 if (S_ISDIR(ip->i_inode.i_mode)) {
1438 /* don't move a directory into its subdir */
1439 error = gfs2_ok_to_move(ip, ndip);
1446 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs);
1448 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE,GL_ASYNC,
1452 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh);
1456 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC,
1461 for (x = 0; x < num_gh; x++) {
1462 error = gfs2_glock_nq(ghs + x);
1466 error = gfs2_glock_async_wait(num_gh, ghs);
1471 /* Grab the resource group glock for unlink flag twiddling.
1472 * This is the case where the target dinode already exists
1473 * so we unlink before doing the rename.
1475 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1);
1480 error = gfs2_glock_nq_init(nrgd->rd_gl, LM_ST_EXCLUSIVE,
1481 LM_FLAG_NODE_SCOPE, &rd_gh);
1487 if (ip->i_inode.i_nlink == 0)
1490 /* Check out the old directory */
1492 error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
1496 /* Check out the new directory */
1499 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1503 if (nip->i_inode.i_nlink == 0) {
1508 if (S_ISDIR(nip->i_inode.i_mode)) {
1509 if (nip->i_entries < 2) {
1510 gfs2_consist_inode(nip);
1514 if (nip->i_entries > 2) {
1520 error = gfs2_permission(&nop_mnt_idmap, ndir,
1521 MAY_WRITE | MAY_EXEC);
1525 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
1538 if (!ndip->i_inode.i_nlink) {
1542 if (ndip->i_entries == (u32)-1) {
1546 if (S_ISDIR(ip->i_inode.i_mode) &&
1547 ndip->i_inode.i_nlink == (u32)-1) {
1554 /* Check out the dir to be renamed */
1557 error = gfs2_permission(&nop_mnt_idmap, d_inode(odentry),
1564 error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da);
1570 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
1571 error = gfs2_quota_lock_check(ndip, &ap);
1575 error = gfs2_inplace_reserve(ndip, &ap);
1579 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) +
1580 4 * RES_LEAF + 4, 0);
1584 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
1585 5 * RES_LEAF + 4, 0);
1590 /* Remove the target file, if it exists */
1593 error = gfs2_unlink_inode(ndip, ndentry);
1595 error = update_moved_ino(ip, ndip, dir_rename);
1599 error = gfs2_dir_del(odip, odentry);
1603 error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da);
1608 gfs2_trans_end(sdp);
1611 gfs2_inplace_release(ndip);
1614 gfs2_quota_unlock(ndip);
1616 gfs2_dir_no_add(&da);
1617 if (gfs2_holder_initialized(&rd_gh))
1618 gfs2_glock_dq_uninit(&rd_gh);
1621 if (gfs2_holder_queued(ghs + x))
1622 gfs2_glock_dq(ghs + x);
1623 gfs2_holder_uninit(ghs + x);
1626 if (gfs2_holder_initialized(&r_gh))
1627 gfs2_glock_dq_uninit(&r_gh);
1634 * gfs2_exchange - exchange two files
1635 * @odir: Parent directory of old file name
1636 * @odentry: The old dentry of the file
1637 * @ndir: Parent directory of new file name
1638 * @ndentry: The new dentry of the file
1639 * @flags: The rename flags
1644 static int gfs2_exchange(struct inode *odir, struct dentry *odentry,
1645 struct inode *ndir, struct dentry *ndentry,
1648 struct gfs2_inode *odip = GFS2_I(odir);
1649 struct gfs2_inode *ndip = GFS2_I(ndir);
1650 struct gfs2_inode *oip = GFS2_I(odentry->d_inode);
1651 struct gfs2_inode *nip = GFS2_I(ndentry->d_inode);
1652 struct gfs2_sbd *sdp = GFS2_SB(odir);
1653 struct gfs2_holder ghs[4], r_gh;
1654 unsigned int num_gh;
1656 umode_t old_mode = oip->i_inode.i_mode;
1657 umode_t new_mode = nip->i_inode.i_mode;
1660 gfs2_holder_mark_uninitialized(&r_gh);
1661 error = gfs2_rindex_update(sdp);
1666 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1671 if (S_ISDIR(old_mode)) {
1672 /* don't move a directory into its subdir */
1673 error = gfs2_ok_to_move(oip, ndip);
1678 if (S_ISDIR(new_mode)) {
1679 /* don't move a directory into its subdir */
1680 error = gfs2_ok_to_move(nip, odip);
1687 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs);
1689 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC,
1693 gfs2_holder_init(oip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh);
1696 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh);
1699 for (x = 0; x < num_gh; x++) {
1700 error = gfs2_glock_nq(ghs + x);
1705 error = gfs2_glock_async_wait(num_gh, ghs);
1710 if (oip->i_inode.i_nlink == 0 || nip->i_inode.i_nlink == 0)
1713 error = gfs2_unlink_ok(odip, &odentry->d_name, oip);
1716 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1720 if (S_ISDIR(old_mode)) {
1721 error = gfs2_permission(&nop_mnt_idmap, odentry->d_inode,
1726 if (S_ISDIR(new_mode)) {
1727 error = gfs2_permission(&nop_mnt_idmap, ndentry->d_inode,
1732 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 4 * RES_LEAF, 0);
1736 error = update_moved_ino(oip, ndip, S_ISDIR(old_mode));
1740 error = update_moved_ino(nip, odip, S_ISDIR(new_mode));
1744 error = gfs2_dir_mvino(ndip, &ndentry->d_name, oip,
1749 error = gfs2_dir_mvino(odip, &odentry->d_name, nip,
1755 if (S_ISDIR(new_mode) && !S_ISDIR(old_mode)) {
1756 inc_nlink(&odip->i_inode);
1757 drop_nlink(&ndip->i_inode);
1758 } else if (S_ISDIR(old_mode) && !S_ISDIR(new_mode)) {
1759 inc_nlink(&ndip->i_inode);
1760 drop_nlink(&odip->i_inode);
1763 mark_inode_dirty(&ndip->i_inode);
1765 mark_inode_dirty(&odip->i_inode);
1768 gfs2_trans_end(sdp);
1771 if (gfs2_holder_queued(ghs + x))
1772 gfs2_glock_dq(ghs + x);
1773 gfs2_holder_uninit(ghs + x);
1776 if (gfs2_holder_initialized(&r_gh))
1777 gfs2_glock_dq_uninit(&r_gh);
1782 static int gfs2_rename2(struct mnt_idmap *idmap, struct inode *odir,
1783 struct dentry *odentry, struct inode *ndir,
1784 struct dentry *ndentry, unsigned int flags)
1786 flags &= ~RENAME_NOREPLACE;
1788 if (flags & ~RENAME_EXCHANGE)
1791 if (flags & RENAME_EXCHANGE)
1792 return gfs2_exchange(odir, odentry, ndir, ndentry, flags);
1794 return gfs2_rename(odir, odentry, ndir, ndentry);
1798 * gfs2_get_link - Follow a symbolic link
1799 * @dentry: The dentry of the link
1800 * @inode: The inode of the link
1801 * @done: destructor for return value
1803 * This can handle symlinks of any size.
1805 * Returns: 0 on success or error code
1808 static const char *gfs2_get_link(struct dentry *dentry,
1809 struct inode *inode,
1810 struct delayed_call *done)
1812 struct gfs2_inode *ip = GFS2_I(inode);
1813 struct gfs2_holder i_gh;
1814 struct buffer_head *dibh;
1820 return ERR_PTR(-ECHILD);
1822 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1823 error = gfs2_glock_nq(&i_gh);
1825 gfs2_holder_uninit(&i_gh);
1826 return ERR_PTR(error);
1829 size = (unsigned int)i_size_read(&ip->i_inode);
1831 gfs2_consist_inode(ip);
1832 buf = ERR_PTR(-EIO);
1836 error = gfs2_meta_inode_buffer(ip, &dibh);
1838 buf = ERR_PTR(error);
1842 buf = kzalloc(size + 1, GFP_NOFS);
1844 buf = ERR_PTR(-ENOMEM);
1846 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
1849 gfs2_glock_dq_uninit(&i_gh);
1851 set_delayed_call(done, kfree_link, buf);
1857 * @idmap: idmap of the mount the inode was found from
1859 * @mask: The mask to be tested
1861 * This may be called from the VFS directly, or from within GFS2 with the
1862 * inode locked, so we look to see if the glock is already locked and only
1863 * lock the glock if its not already been done.
1868 int gfs2_permission(struct mnt_idmap *idmap, struct inode *inode,
1871 int may_not_block = mask & MAY_NOT_BLOCK;
1872 struct gfs2_inode *ip;
1873 struct gfs2_holder i_gh;
1874 struct gfs2_glock *gl;
1877 gfs2_holder_mark_uninitialized(&i_gh);
1879 gl = rcu_dereference_check(ip->i_gl, !may_not_block);
1880 if (unlikely(!gl)) {
1881 /* inode is getting torn down, must be RCU mode */
1882 WARN_ON_ONCE(!may_not_block);
1885 if (gfs2_glock_is_locked_by_me(gl) == NULL) {
1888 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1893 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1896 error = generic_permission(&nop_mnt_idmap, inode, mask);
1897 if (gfs2_holder_initialized(&i_gh))
1898 gfs2_glock_dq_uninit(&i_gh);
1903 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1905 setattr_copy(&nop_mnt_idmap, inode, attr);
1906 mark_inode_dirty(inode);
1910 static int gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1914 if (current->journal_info)
1915 return __gfs2_setattr_simple(inode, attr);
1917 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0);
1921 error = __gfs2_setattr_simple(inode, attr);
1922 gfs2_trans_end(GFS2_SB(inode));
1926 static int setattr_chown(struct inode *inode, struct iattr *attr)
1928 struct gfs2_inode *ip = GFS2_I(inode);
1929 struct gfs2_sbd *sdp = GFS2_SB(inode);
1933 struct gfs2_alloc_parms ap = {};
1935 ouid = inode->i_uid;
1936 ogid = inode->i_gid;
1937 nuid = attr->ia_uid;
1938 ngid = attr->ia_gid;
1940 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid))
1941 ouid = nuid = NO_UID_QUOTA_CHANGE;
1942 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid))
1943 ogid = ngid = NO_GID_QUOTA_CHANGE;
1944 error = gfs2_qa_get(ip);
1948 error = gfs2_rindex_update(sdp);
1952 error = gfs2_quota_lock(ip, nuid, ngid);
1956 ap.target = gfs2_get_inode_blocks(&ip->i_inode);
1958 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1959 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1960 error = gfs2_quota_check(ip, nuid, ngid, &ap);
1965 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1969 error = gfs2_setattr_simple(inode, attr);
1973 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1974 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1975 gfs2_quota_change(ip, -(s64)ap.target, ouid, ogid);
1976 gfs2_quota_change(ip, ap.target, nuid, ngid);
1980 gfs2_trans_end(sdp);
1982 gfs2_quota_unlock(ip);
1989 * gfs2_setattr - Change attributes on an inode
1990 * @idmap: idmap of the mount the inode was found from
1991 * @dentry: The dentry which is changing
1992 * @attr: The structure describing the change
1994 * The VFS layer wants to change one or more of an inodes attributes. Write
1995 * that change out to disk.
2000 static int gfs2_setattr(struct mnt_idmap *idmap,
2001 struct dentry *dentry, struct iattr *attr)
2003 struct inode *inode = d_inode(dentry);
2004 struct gfs2_inode *ip = GFS2_I(inode);
2005 struct gfs2_holder i_gh;
2008 error = gfs2_qa_get(ip);
2012 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
2016 error = may_setattr(&nop_mnt_idmap, inode, attr->ia_valid);
2020 error = setattr_prepare(&nop_mnt_idmap, dentry, attr);
2024 if (attr->ia_valid & ATTR_SIZE)
2025 error = gfs2_setattr_size(inode, attr->ia_size);
2026 else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
2027 error = setattr_chown(inode, attr);
2029 error = gfs2_setattr_simple(inode, attr);
2030 if (!error && attr->ia_valid & ATTR_MODE)
2031 error = posix_acl_chmod(&nop_mnt_idmap, dentry,
2037 mark_inode_dirty(inode);
2038 gfs2_glock_dq_uninit(&i_gh);
2045 * gfs2_getattr - Read out an inode's attributes
2046 * @idmap: idmap of the mount the inode was found from
2047 * @path: Object to query
2048 * @stat: The inode's stats
2049 * @request_mask: Mask of STATX_xxx flags indicating the caller's interests
2050 * @flags: AT_STATX_xxx setting
2052 * This may be called from the VFS directly, or from within GFS2 with the
2053 * inode locked, so we look to see if the glock is already locked and only
2054 * lock the glock if its not already been done. Note that its the NFS
2055 * readdirplus operation which causes this to be called (from filldir)
2056 * with the glock already held.
2061 static int gfs2_getattr(struct mnt_idmap *idmap,
2062 const struct path *path, struct kstat *stat,
2063 u32 request_mask, unsigned int flags)
2065 struct inode *inode = d_inode(path->dentry);
2066 struct gfs2_inode *ip = GFS2_I(inode);
2067 struct gfs2_holder gh;
2071 gfs2_holder_mark_uninitialized(&gh);
2072 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
2073 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
2078 gfsflags = ip->i_diskflags;
2079 if (gfsflags & GFS2_DIF_APPENDONLY)
2080 stat->attributes |= STATX_ATTR_APPEND;
2081 if (gfsflags & GFS2_DIF_IMMUTABLE)
2082 stat->attributes |= STATX_ATTR_IMMUTABLE;
2084 stat->attributes_mask |= (STATX_ATTR_APPEND |
2085 STATX_ATTR_COMPRESSED |
2086 STATX_ATTR_ENCRYPTED |
2087 STATX_ATTR_IMMUTABLE |
2090 generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat);
2092 if (gfs2_holder_initialized(&gh))
2093 gfs2_glock_dq_uninit(&gh);
2098 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
2101 struct gfs2_inode *ip = GFS2_I(inode);
2102 struct gfs2_holder gh;
2105 inode_lock_shared(inode);
2107 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2111 ret = iomap_fiemap(inode, fieinfo, start, len, &gfs2_iomap_ops);
2113 gfs2_glock_dq_uninit(&gh);
2116 inode_unlock_shared(inode);
2120 loff_t gfs2_seek_data(struct file *file, loff_t offset)
2122 struct inode *inode = file->f_mapping->host;
2123 struct gfs2_inode *ip = GFS2_I(inode);
2124 struct gfs2_holder gh;
2127 inode_lock_shared(inode);
2128 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2130 ret = iomap_seek_data(inode, offset, &gfs2_iomap_ops);
2131 gfs2_glock_dq_uninit(&gh);
2132 inode_unlock_shared(inode);
2136 return vfs_setpos(file, ret, inode->i_sb->s_maxbytes);
2139 loff_t gfs2_seek_hole(struct file *file, loff_t offset)
2141 struct inode *inode = file->f_mapping->host;
2142 struct gfs2_inode *ip = GFS2_I(inode);
2143 struct gfs2_holder gh;
2146 inode_lock_shared(inode);
2147 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2149 ret = iomap_seek_hole(inode, offset, &gfs2_iomap_ops);
2150 gfs2_glock_dq_uninit(&gh);
2151 inode_unlock_shared(inode);
2155 return vfs_setpos(file, ret, inode->i_sb->s_maxbytes);
2158 static int gfs2_update_time(struct inode *inode, int flags)
2160 struct gfs2_inode *ip = GFS2_I(inode);
2161 struct gfs2_glock *gl = ip->i_gl;
2162 struct gfs2_holder *gh;
2165 gh = gfs2_glock_is_locked_by_me(gl);
2166 if (gh && gl->gl_state != LM_ST_EXCLUSIVE) {
2168 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, gh);
2169 error = gfs2_glock_nq(gh);
2173 generic_update_time(inode, flags);
2177 static const struct inode_operations gfs2_file_iops = {
2178 .permission = gfs2_permission,
2179 .setattr = gfs2_setattr,
2180 .getattr = gfs2_getattr,
2181 .listxattr = gfs2_listxattr,
2182 .fiemap = gfs2_fiemap,
2183 .get_inode_acl = gfs2_get_acl,
2184 .set_acl = gfs2_set_acl,
2185 .update_time = gfs2_update_time,
2186 .fileattr_get = gfs2_fileattr_get,
2187 .fileattr_set = gfs2_fileattr_set,
2190 static const struct inode_operations gfs2_dir_iops = {
2191 .create = gfs2_create,
2192 .lookup = gfs2_lookup,
2194 .unlink = gfs2_unlink,
2195 .symlink = gfs2_symlink,
2196 .mkdir = gfs2_mkdir,
2197 .rmdir = gfs2_unlink,
2198 .mknod = gfs2_mknod,
2199 .rename = gfs2_rename2,
2200 .permission = gfs2_permission,
2201 .setattr = gfs2_setattr,
2202 .getattr = gfs2_getattr,
2203 .listxattr = gfs2_listxattr,
2204 .fiemap = gfs2_fiemap,
2205 .get_inode_acl = gfs2_get_acl,
2206 .set_acl = gfs2_set_acl,
2207 .update_time = gfs2_update_time,
2208 .atomic_open = gfs2_atomic_open,
2209 .fileattr_get = gfs2_fileattr_get,
2210 .fileattr_set = gfs2_fileattr_set,
2213 static const struct inode_operations gfs2_symlink_iops = {
2214 .get_link = gfs2_get_link,
2215 .permission = gfs2_permission,
2216 .setattr = gfs2_setattr,
2217 .getattr = gfs2_getattr,
2218 .listxattr = gfs2_listxattr,
2219 .fiemap = gfs2_fiemap,