2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2011 Red Hat, Inc. All rights reserved.
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
7 * of the GNU General Public License version 2.
10 #include <linux/slab.h>
11 #include <linux/spinlock.h>
12 #include <linux/completion.h>
13 #include <linux/buffer_head.h>
14 #include <linux/namei.h>
16 #include <linux/cred.h>
17 #include <linux/xattr.h>
18 #include <linux/posix_acl.h>
19 #include <linux/gfs2_ondisk.h>
20 #include <linux/crc32.h>
21 #include <linux/fiemap.h>
22 #include <linux/security.h>
23 #include <linux/uaccess.h>
41 static int iget_test(struct inode *inode, void *opaque)
43 u64 no_addr = *(u64 *)opaque;
45 return GFS2_I(inode)->i_no_addr == no_addr;
48 static int iget_set(struct inode *inode, void *opaque)
50 u64 no_addr = *(u64 *)opaque;
52 GFS2_I(inode)->i_no_addr = no_addr;
53 inode->i_ino = no_addr;
57 static struct inode *gfs2_iget(struct super_block *sb, u64 no_addr)
62 inode = iget5_locked(sb, no_addr, iget_test, iget_set, &no_addr);
65 if (is_bad_inode(inode)) {
73 * gfs2_set_iop - Sets inode operations
74 * @inode: The inode with correct i_mode filled in
76 * GFS2 lookup code fills in vfs inode contents based on info obtained
77 * from directory entry inside gfs2_inode_lookup().
80 static void gfs2_set_iop(struct inode *inode)
82 struct gfs2_sbd *sdp = GFS2_SB(inode);
83 umode_t mode = inode->i_mode;
86 inode->i_op = &gfs2_file_iops;
87 if (gfs2_localflocks(sdp))
88 inode->i_fop = &gfs2_file_fops_nolock;
90 inode->i_fop = &gfs2_file_fops;
91 } else if (S_ISDIR(mode)) {
92 inode->i_op = &gfs2_dir_iops;
93 if (gfs2_localflocks(sdp))
94 inode->i_fop = &gfs2_dir_fops_nolock;
96 inode->i_fop = &gfs2_dir_fops;
97 } else if (S_ISLNK(mode)) {
98 inode->i_op = &gfs2_symlink_iops;
100 inode->i_op = &gfs2_file_iops;
101 init_special_inode(inode, inode->i_mode, inode->i_rdev);
106 * gfs2_inode_lookup - Lookup an inode
107 * @sb: The super block
108 * @type: The type of the inode
109 * @no_addr: The inode number
110 * @no_formal_ino: The inode generation number
111 * @blktype: Requested block type (GFS2_BLKST_DINODE or GFS2_BLKST_UNLINKED;
112 * GFS2_BLKST_FREE do indicate not to verify)
114 * If @type is DT_UNKNOWN, the inode type is fetched from disk.
116 * If @blktype is anything other than GFS2_BLKST_FREE (which is used as a
117 * placeholder because it doesn't otherwise make sense), the on-disk block type
118 * is verified to be @blktype.
120 * Returns: A VFS inode, or an error
123 struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type,
124 u64 no_addr, u64 no_formal_ino,
125 unsigned int blktype)
128 struct gfs2_inode *ip;
129 struct gfs2_glock *io_gl = NULL;
130 struct gfs2_holder i_gh;
133 gfs2_holder_mark_uninitialized(&i_gh);
134 inode = gfs2_iget(sb, no_addr);
136 return ERR_PTR(-ENOMEM);
140 if (inode->i_state & I_NEW) {
141 struct gfs2_sbd *sdp = GFS2_SB(inode);
142 ip->i_no_formal_ino = no_formal_ino;
144 error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
147 ip->i_gl->gl_object = ip;
149 error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE, &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 with gfs2_inode_refresh
157 * after possibly checking the block type.
159 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE,
164 if (blktype != GFS2_BLKST_FREE) {
165 error = gfs2_check_blk_type(sdp, no_addr,
172 set_bit(GIF_INVALID, &ip->i_flags);
173 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
177 ip->i_iopen_gh.gh_gl->gl_object = ip;
178 gfs2_glock_put(io_gl);
181 if (type == DT_UNKNOWN) {
182 /* Inode glock must be locked already */
183 error = gfs2_inode_refresh(GFS2_I(inode));
187 inode->i_mode = DT2IF(type);
192 inode->i_atime.tv_sec = 0;
193 inode->i_atime.tv_nsec = 0;
195 unlock_new_inode(inode);
198 if (gfs2_holder_initialized(&i_gh))
199 gfs2_glock_dq_uninit(&i_gh);
203 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
204 ip->i_iopen_gh.gh_gl->gl_object = NULL;
205 gfs2_glock_dq_wait(&ip->i_iopen_gh);
206 gfs2_holder_uninit(&ip->i_iopen_gh);
209 gfs2_glock_put(io_gl);
210 if (gfs2_holder_initialized(&i_gh))
211 gfs2_glock_dq_uninit(&i_gh);
212 ip->i_gl->gl_object = NULL;
215 return ERR_PTR(error);
218 struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr,
219 u64 *no_formal_ino, unsigned int blktype)
221 struct super_block *sb = sdp->sd_vfs;
225 inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, 0, blktype);
229 /* Two extra checks for NFS only */
232 if (GFS2_I(inode)->i_no_formal_ino != *no_formal_ino)
236 if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM)
243 return ERR_PTR(error);
247 struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
251 gfs2_str2qstr(&qstr, name);
252 inode = gfs2_lookupi(dip, &qstr, 1);
253 /* gfs2_lookupi has inconsistent callers: vfs
254 * related routines expect NULL for no entry found,
255 * gfs2_lookup_simple callers expect ENOENT
256 * and do not check for NULL.
259 return ERR_PTR(-ENOENT);
266 * gfs2_lookupi - Look up a filename in a directory and return its inode
267 * @d_gh: An initialized holder for the directory glock
268 * @name: The name of the inode to look for
269 * @is_root: If 1, ignore the caller's permissions
270 * @i_gh: An uninitialized holder for the new inode glock
272 * This can be called via the VFS filldir function when NFS is doing
273 * a readdirplus and the inode which its intending to stat isn't
274 * already in cache. In this case we must not take the directory glock
275 * again, since the readdir call will have already taken that lock.
280 struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
283 struct super_block *sb = dir->i_sb;
284 struct gfs2_inode *dip = GFS2_I(dir);
285 struct gfs2_holder d_gh;
287 struct inode *inode = NULL;
289 gfs2_holder_mark_uninitialized(&d_gh);
290 if (!name->len || name->len > GFS2_FNAMESIZE)
291 return ERR_PTR(-ENAMETOOLONG);
293 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
294 (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
295 dir == d_inode(sb->s_root))) {
300 if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) {
301 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
303 return ERR_PTR(error);
307 error = gfs2_permission(dir, MAY_EXEC);
312 inode = gfs2_dir_search(dir, name, false);
314 error = PTR_ERR(inode);
316 if (gfs2_holder_initialized(&d_gh))
317 gfs2_glock_dq_uninit(&d_gh);
318 if (error == -ENOENT)
320 return inode ? inode : ERR_PTR(error);
324 * create_ok - OK to create a new on-disk inode here?
325 * @dip: Directory in which dinode is to be created
326 * @name: Name of new dinode
332 static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
337 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
341 /* Don't create entries in an unlinked directory */
342 if (!dip->i_inode.i_nlink)
345 if (dip->i_entries == (u32)-1)
347 if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1)
353 static void munge_mode_uid_gid(const struct gfs2_inode *dip,
356 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
357 (dip->i_inode.i_mode & S_ISUID) &&
358 !uid_eq(dip->i_inode.i_uid, GLOBAL_ROOT_UID)) {
359 if (S_ISDIR(inode->i_mode))
360 inode->i_mode |= S_ISUID;
361 else if (!uid_eq(dip->i_inode.i_uid, current_fsuid()))
362 inode->i_mode &= ~07111;
363 inode->i_uid = dip->i_inode.i_uid;
365 inode->i_uid = current_fsuid();
367 if (dip->i_inode.i_mode & S_ISGID) {
368 if (S_ISDIR(inode->i_mode))
369 inode->i_mode |= S_ISGID;
370 inode->i_gid = dip->i_inode.i_gid;
372 inode->i_gid = current_fsgid();
375 static int alloc_dinode(struct gfs2_inode *ip, u32 flags, unsigned *dblocks)
377 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
378 struct gfs2_alloc_parms ap = { .target = *dblocks, .aflags = flags, };
381 error = gfs2_quota_lock_check(ip, &ap);
385 error = gfs2_inplace_reserve(ip, &ap);
389 error = gfs2_trans_begin(sdp, (*dblocks * RES_RG_BIT) + RES_STATFS + RES_QUOTA, 0);
393 error = gfs2_alloc_blocks(ip, &ip->i_no_addr, dblocks, 1, &ip->i_generation);
394 ip->i_no_formal_ino = ip->i_generation;
395 ip->i_inode.i_ino = ip->i_no_addr;
396 ip->i_goal = ip->i_no_addr;
401 gfs2_inplace_release(ip);
403 gfs2_quota_unlock(ip);
408 static void gfs2_init_dir(struct buffer_head *dibh,
409 const struct gfs2_inode *parent)
411 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
412 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
414 gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent);
415 dent->de_inum = di->di_num; /* already GFS2 endian */
416 dent->de_type = cpu_to_be16(DT_DIR);
418 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
419 gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
420 gfs2_inum_out(parent, dent);
421 dent->de_type = cpu_to_be16(DT_DIR);
426 * gfs2_init_xattr - Initialise an xattr block for a new inode
427 * @ip: The inode in question
429 * This sets up an empty xattr block for a new inode, ready to
430 * take any ACLs, LSM xattrs, etc.
433 static void gfs2_init_xattr(struct gfs2_inode *ip)
435 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
436 struct buffer_head *bh;
437 struct gfs2_ea_header *ea;
439 bh = gfs2_meta_new(ip->i_gl, ip->i_eattr);
440 gfs2_trans_add_meta(ip->i_gl, bh);
441 gfs2_metatype_set(bh, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
442 gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header));
444 ea = GFS2_EA_BH2FIRST(bh);
445 ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
446 ea->ea_type = GFS2_EATYPE_UNUSED;
447 ea->ea_flags = GFS2_EAFLAG_LAST;
453 * init_dinode - Fill in a new dinode structure
454 * @dip: The directory this inode is being created in
456 * @symname: The symlink destination (if a symlink)
457 * @bhp: The buffer head (returned to caller)
461 static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip,
464 struct gfs2_dinode *di;
465 struct buffer_head *dibh;
467 dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr);
468 gfs2_trans_add_meta(ip->i_gl, dibh);
469 di = (struct gfs2_dinode *)dibh->b_data;
470 gfs2_dinode_out(ip, di);
472 di->di_major = cpu_to_be32(MAJOR(ip->i_inode.i_rdev));
473 di->di_minor = cpu_to_be32(MINOR(ip->i_inode.i_rdev));
477 memset(&di->__pad4, 0, sizeof(di->__pad4));
478 memset(&di->di_reserved, 0, sizeof(di->di_reserved));
479 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
481 switch(ip->i_inode.i_mode & S_IFMT) {
483 gfs2_init_dir(dibh, dip);
486 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size);
490 set_buffer_uptodate(dibh);
495 * gfs2_trans_da_blocks - Calculate number of blocks to link inode
496 * @dip: The directory we are linking into
497 * @da: The dir add information
498 * @nr_inodes: The number of inodes involved
500 * This calculate the number of blocks we need to reserve in a
501 * transaction to link @nr_inodes into a directory. In most cases
502 * @nr_inodes will be 2 (the directory plus the inode being linked in)
503 * but in case of rename, 4 may be required.
505 * Returns: Number of blocks
508 static unsigned gfs2_trans_da_blks(const struct gfs2_inode *dip,
509 const struct gfs2_diradd *da,
512 return da->nr_blocks + gfs2_rg_blocks(dip, da->nr_blocks) +
513 (nr_inodes * RES_DINODE) + RES_QUOTA + RES_STATFS;
516 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
517 struct gfs2_inode *ip, struct gfs2_diradd *da)
519 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
520 struct gfs2_alloc_parms ap = { .target = da->nr_blocks, };
524 error = gfs2_quota_lock_check(dip, &ap);
526 goto fail_quota_locks;
528 error = gfs2_inplace_reserve(dip, &ap);
530 goto fail_quota_locks;
532 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, da, 2), 0);
536 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
538 goto fail_quota_locks;
541 error = gfs2_dir_add(&dip->i_inode, name, ip, da);
545 gfs2_inplace_release(dip);
547 gfs2_quota_unlock(dip);
551 static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
554 const struct xattr *xattr;
557 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
558 err = __gfs2_xattr_set(inode, xattr->name, xattr->value,
560 GFS2_EATYPE_SECURITY);
568 * gfs2_create_inode - Create a new inode
569 * @dir: The parent directory
570 * @dentry: The new dentry
571 * @file: If non-NULL, the file which is being opened
572 * @mode: The permissions on the new inode
573 * @dev: For device nodes, this is the device number
574 * @symname: For symlinks, this is the link destination
575 * @size: The initial size of the inode (ignored for directories)
577 * Returns: 0 on success, or error code
580 static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
582 umode_t mode, dev_t dev, const char *symname,
583 unsigned int size, int excl, int *opened)
585 const struct qstr *name = &dentry->d_name;
586 struct posix_acl *default_acl, *acl;
587 struct gfs2_holder ghs[2];
588 struct inode *inode = NULL;
589 struct gfs2_inode *dip = GFS2_I(dir), *ip;
590 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
591 struct gfs2_glock *io_gl = NULL;
592 int error, free_vfs_inode = 1;
595 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
597 if (!name->len || name->len > GFS2_FNAMESIZE)
598 return -ENAMETOOLONG;
600 error = gfs2_rsqa_alloc(dip);
604 error = gfs2_rindex_update(sdp);
608 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
612 error = create_ok(dip, name, mode);
616 inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl);
617 error = PTR_ERR(inode);
618 if (!IS_ERR(inode)) {
619 if (S_ISDIR(inode->i_mode)) {
621 inode = ERR_PTR(-EISDIR);
624 d_instantiate(dentry, inode);
627 if (S_ISREG(inode->i_mode))
628 error = finish_open(file, dentry, gfs2_open_common, opened);
630 error = finish_no_open(file, NULL);
632 gfs2_glock_dq_uninit(ghs);
634 } else if (error != -ENOENT) {
638 error = gfs2_diradd_alloc_required(dir, name, &da);
642 inode = new_inode(sdp->sd_vfs);
647 error = posix_acl_create(dir, &mode, &default_acl, &acl);
652 error = gfs2_rsqa_alloc(ip);
656 inode->i_mode = mode;
657 set_nlink(inode, S_ISDIR(mode) ? 2 : 1);
659 inode->i_size = size;
660 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
661 gfs2_set_inode_blocks(inode, 1);
662 munge_mode_uid_gid(dip, inode);
663 check_and_update_goal(dip);
664 ip->i_goal = dip->i_goal;
671 switch(mode & S_IFMT) {
673 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) ||
674 gfs2_tune_get(sdp, gt_new_files_jdata))
675 ip->i_diskflags |= GFS2_DIF_JDATA;
676 gfs2_set_aops(inode);
679 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA);
680 ip->i_diskflags |= GFS2_DIF_JDATA;
685 /* Force SYSTEM flag on all files and subdirs of a SYSTEM directory */
686 if (dip->i_diskflags & GFS2_DIF_SYSTEM)
687 ip->i_diskflags |= GFS2_DIF_SYSTEM;
689 gfs2_set_inode_flags(inode);
691 if ((GFS2_I(d_inode(sdp->sd_root_dir)) == dip) ||
692 (dip->i_diskflags & GFS2_DIF_TOPDIR))
693 aflags |= GFS2_AF_ORLOV;
695 if (default_acl || acl)
698 error = alloc_dinode(ip, aflags, &blocks);
700 goto fail_free_inode;
702 gfs2_set_inode_blocks(inode, blocks);
704 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
706 goto fail_free_inode;
708 ip->i_gl->gl_object = ip;
709 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
711 goto fail_free_inode;
713 error = gfs2_trans_begin(sdp, blocks, 0);
718 ip->i_eattr = ip->i_no_addr + 1;
721 init_dinode(dip, ip, symname);
724 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
728 BUG_ON(test_and_set_bit(GLF_INODE_CREATING, &io_gl->gl_flags));
730 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
734 ip->i_iopen_gh.gh_gl->gl_object = ip;
735 gfs2_glock_put(io_gl);
737 insert_inode_hash(inode);
739 free_vfs_inode = 0; /* After this point, the inode is no longer
740 considered free. Any failures need to undo
741 the gfs2 structures. */
743 error = __gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
744 posix_acl_release(default_acl);
748 error = __gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS);
749 posix_acl_release(acl);
755 error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name,
756 &gfs2_initxattrs, NULL);
760 error = link_dinode(dip, name, ip, &da);
764 mark_inode_dirty(inode);
765 d_instantiate(dentry, inode);
767 *opened |= FILE_CREATED;
768 error = finish_open(file, dentry, gfs2_open_common, opened);
770 gfs2_glock_dq_uninit(ghs);
771 gfs2_glock_dq_uninit(ghs + 1);
772 clear_bit(GLF_INODE_CREATING, &io_gl->gl_flags);
776 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
777 gfs2_glock_put(io_gl);
780 clear_bit(GLF_INODE_CREATING, &io_gl->gl_flags);
781 gfs2_glock_dq_uninit(ghs + 1);
784 gfs2_glock_put(ip->i_gl);
785 gfs2_rsqa_delete(ip, NULL);
788 posix_acl_release(default_acl);
790 posix_acl_release(acl);
792 gfs2_dir_no_add(&da);
793 gfs2_glock_dq_uninit(ghs);
794 if (inode && !IS_ERR(inode)) {
797 mark_inode_dirty(inode);
798 set_bit(free_vfs_inode ? GIF_FREE_VFS_INODE : GIF_ALLOC_FAILED,
799 &GFS2_I(inode)->i_flags);
807 * gfs2_create - Create a file
808 * @dir: The directory in which to create the file
809 * @dentry: The dentry of the new file
810 * @mode: The mode of the new file
815 static int gfs2_create(struct inode *dir, struct dentry *dentry,
816 umode_t mode, bool excl)
818 return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl, NULL);
822 * __gfs2_lookup - Look up a filename in a directory and return its inode
823 * @dir: The directory inode
824 * @dentry: The dentry of the new inode
825 * @file: File to be opened
826 * @opened: atomic_open flags
832 static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry,
833 struct file *file, int *opened)
837 struct gfs2_holder gh;
838 struct gfs2_glock *gl;
841 inode = gfs2_lookupi(dir, &dentry->d_name, 0);
847 return ERR_CAST(inode);
849 gl = GFS2_I(inode)->i_gl;
850 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
853 return ERR_PTR(error);
856 d = d_splice_alias(inode, dentry);
858 gfs2_glock_dq_uninit(&gh);
861 if (file && S_ISREG(inode->i_mode))
862 error = finish_open(file, dentry, gfs2_open_common, opened);
864 gfs2_glock_dq_uninit(&gh);
867 return ERR_PTR(error);
872 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
875 return __gfs2_lookup(dir, dentry, NULL, NULL);
879 * gfs2_link - Link to a file
880 * @old_dentry: The inode to link
881 * @dir: Add link to this directory
882 * @dentry: The name of the link
884 * Link the inode in "old_dentry" into the directory "dir" with the
890 static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
891 struct dentry *dentry)
893 struct gfs2_inode *dip = GFS2_I(dir);
894 struct gfs2_sbd *sdp = GFS2_SB(dir);
895 struct inode *inode = d_inode(old_dentry);
896 struct gfs2_inode *ip = GFS2_I(inode);
897 struct gfs2_holder ghs[2];
898 struct buffer_head *dibh;
899 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
902 if (S_ISDIR(inode->i_mode))
905 error = gfs2_rsqa_alloc(dip);
909 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
910 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
912 error = gfs2_glock_nq(ghs); /* parent */
916 error = gfs2_glock_nq(ghs + 1); /* child */
921 if (inode->i_nlink == 0)
924 error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC);
928 error = gfs2_dir_check(dir, &dentry->d_name, NULL);
939 if (!dip->i_inode.i_nlink)
942 if (dip->i_entries == (u32)-1)
945 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
948 if (!ip->i_inode.i_nlink)
951 if (ip->i_inode.i_nlink == (u32)-1)
954 error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da);
959 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
960 error = gfs2_quota_lock_check(dip, &ap);
964 error = gfs2_inplace_reserve(dip, &ap);
968 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0);
972 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
977 error = gfs2_meta_inode_buffer(ip, &dibh);
981 error = gfs2_dir_add(dir, &dentry->d_name, ip, &da);
985 gfs2_trans_add_meta(ip->i_gl, dibh);
986 inc_nlink(&ip->i_inode);
987 ip->i_inode.i_ctime = current_time(&ip->i_inode);
989 d_instantiate(dentry, inode);
990 mark_inode_dirty(inode);
998 gfs2_inplace_release(dip);
1001 gfs2_quota_unlock(dip);
1003 gfs2_dir_no_add(&da);
1004 gfs2_glock_dq(ghs + 1);
1008 gfs2_holder_uninit(ghs);
1009 gfs2_holder_uninit(ghs + 1);
1014 * gfs2_unlink_ok - check to see that a inode is still in a directory
1015 * @dip: the directory
1016 * @name: the name of the file
1019 * Assumes that the lock on (at least) @dip is held.
1021 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
1024 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
1025 const struct gfs2_inode *ip)
1029 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
1032 if ((dip->i_inode.i_mode & S_ISVTX) &&
1033 !uid_eq(dip->i_inode.i_uid, current_fsuid()) &&
1034 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER))
1037 if (IS_APPEND(&dip->i_inode))
1040 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
1044 return gfs2_dir_check(&dip->i_inode, name, ip);
1048 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it
1049 * @dip: The parent directory
1050 * @name: The name of the entry in the parent directory
1051 * @inode: The inode to be removed
1053 * Called with all the locks and in a transaction. This will only be
1054 * called for a directory after it has been checked to ensure it is empty.
1056 * Returns: 0 on success, or an error
1059 static int gfs2_unlink_inode(struct gfs2_inode *dip,
1060 const struct dentry *dentry)
1062 struct inode *inode = d_inode(dentry);
1063 struct gfs2_inode *ip = GFS2_I(inode);
1066 error = gfs2_dir_del(dip, dentry);
1071 inode->i_ctime = current_time(inode);
1072 if (S_ISDIR(inode->i_mode))
1076 mark_inode_dirty(inode);
1077 if (inode->i_nlink == 0)
1078 gfs2_unlink_di(inode);
1084 * gfs2_unlink - Unlink an inode (this does rmdir as well)
1085 * @dir: The inode of the directory containing the inode to unlink
1086 * @dentry: The file itself
1088 * This routine uses the type of the inode as a flag to figure out
1089 * whether this is an unlink or an rmdir.
1094 static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
1096 struct gfs2_inode *dip = GFS2_I(dir);
1097 struct gfs2_sbd *sdp = GFS2_SB(dir);
1098 struct inode *inode = d_inode(dentry);
1099 struct gfs2_inode *ip = GFS2_I(inode);
1100 struct gfs2_holder ghs[3];
1101 struct gfs2_rgrpd *rgd;
1104 error = gfs2_rindex_update(sdp);
1110 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1111 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
1113 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1117 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
1120 error = gfs2_glock_nq(ghs); /* parent */
1124 error = gfs2_glock_nq(ghs + 1); /* child */
1129 if (inode->i_nlink == 0)
1132 if (S_ISDIR(inode->i_mode)) {
1134 if (ip->i_entries > 2 || inode->i_nlink > 2)
1138 error = gfs2_glock_nq(ghs + 2); /* rgrp */
1142 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
1146 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0);
1150 error = gfs2_unlink_inode(dip, dentry);
1153 gfs2_trans_end(sdp);
1155 gfs2_glock_dq(ghs + 2);
1157 gfs2_glock_dq(ghs + 1);
1161 gfs2_holder_uninit(ghs + 2);
1163 gfs2_holder_uninit(ghs + 1);
1164 gfs2_holder_uninit(ghs);
1169 * gfs2_symlink - Create a symlink
1170 * @dir: The directory to create the symlink in
1171 * @dentry: The dentry to put the symlink in
1172 * @symname: The thing which the link points to
1177 static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
1178 const char *symname)
1180 struct gfs2_sbd *sdp = GFS2_SB(dir);
1183 size = strlen(symname);
1184 if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
1185 return -ENAMETOOLONG;
1187 return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0, NULL);
1191 * gfs2_mkdir - Make a directory
1192 * @dir: The parent directory of the new one
1193 * @dentry: The dentry of the new directory
1194 * @mode: The mode of the new directory
1199 static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
1201 struct gfs2_sbd *sdp = GFS2_SB(dir);
1202 unsigned dsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode);
1203 return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0, NULL);
1207 * gfs2_mknod - Make a special file
1208 * @dir: The directory in which the special file will reside
1209 * @dentry: The dentry of the special file
1210 * @mode: The mode of the special file
1211 * @dev: The device specification of the special file
1215 static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
1218 return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0, NULL);
1222 * gfs2_atomic_open - Atomically open a file
1223 * @dir: The directory
1224 * @dentry: The proposed new entry
1225 * @file: The proposed new struct file
1226 * @flags: open flags
1228 * @opened: Flag to say whether the file has been opened or not
1230 * Returns: error code or 0 for success
1233 static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry,
1234 struct file *file, unsigned flags,
1235 umode_t mode, int *opened)
1238 bool excl = !!(flags & O_EXCL);
1240 if (!d_in_lookup(dentry))
1243 d = __gfs2_lookup(dir, dentry, file, opened);
1248 if (d_really_is_positive(dentry)) {
1249 if (!(*opened & FILE_OPENED))
1250 return finish_no_open(file, d);
1258 if (!(flags & O_CREAT))
1261 return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl, opened);
1265 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1269 * Follow @to back to the root and make sure we don't encounter @this
1270 * Assumes we already hold the rename lock.
1275 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1277 struct inode *dir = &to->i_inode;
1278 struct super_block *sb = dir->i_sb;
1285 if (dir == &this->i_inode) {
1289 if (dir == d_inode(sb->s_root)) {
1294 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
1300 error = PTR_ERR(tmp);
1314 * update_moved_ino - Update an inode that's being moved
1315 * @ip: The inode being moved
1316 * @ndip: The parent directory of the new filename
1317 * @dir_rename: True of ip is a directory
1322 static int update_moved_ino(struct gfs2_inode *ip, struct gfs2_inode *ndip,
1326 struct buffer_head *dibh;
1329 return gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);
1331 error = gfs2_meta_inode_buffer(ip, &dibh);
1334 ip->i_inode.i_ctime = current_time(&ip->i_inode);
1335 gfs2_trans_add_meta(ip->i_gl, dibh);
1336 gfs2_dinode_out(ip, dibh->b_data);
1343 * gfs2_rename - Rename a file
1344 * @odir: Parent directory of old file name
1345 * @odentry: The old dentry of the file
1346 * @ndir: Parent directory of new file name
1347 * @ndentry: The new dentry of the file
1352 static int gfs2_rename(struct inode *odir, struct dentry *odentry,
1353 struct inode *ndir, struct dentry *ndentry)
1355 struct gfs2_inode *odip = GFS2_I(odir);
1356 struct gfs2_inode *ndip = GFS2_I(ndir);
1357 struct gfs2_inode *ip = GFS2_I(d_inode(odentry));
1358 struct gfs2_inode *nip = NULL;
1359 struct gfs2_sbd *sdp = GFS2_SB(odir);
1360 struct gfs2_holder ghs[5], r_gh;
1361 struct gfs2_rgrpd *nrgd;
1362 unsigned int num_gh;
1364 struct gfs2_diradd da = { .nr_blocks = 0, .save_loc = 0, };
1368 gfs2_holder_mark_uninitialized(&r_gh);
1369 if (d_really_is_positive(ndentry)) {
1370 nip = GFS2_I(d_inode(ndentry));
1375 error = gfs2_rindex_update(sdp);
1379 error = gfs2_rsqa_alloc(ndip);
1384 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1389 if (S_ISDIR(ip->i_inode.i_mode)) {
1391 /* don't move a directory into its subdir */
1392 error = gfs2_ok_to_move(ip, ndip);
1399 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1401 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1404 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1408 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1410 /* grab the resource lock for unlink flag twiddling
1411 * this is the case of the target file already existing
1412 * so we unlink before doing the rename
1414 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1);
1416 gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
1419 for (x = 0; x < num_gh; x++) {
1420 error = gfs2_glock_nq(ghs + x);
1426 if (ip->i_inode.i_nlink == 0)
1429 /* Check out the old directory */
1431 error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
1435 /* Check out the new directory */
1438 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1442 if (nip->i_inode.i_nlink == 0) {
1447 if (S_ISDIR(nip->i_inode.i_mode)) {
1448 if (nip->i_entries < 2) {
1449 gfs2_consist_inode(nip);
1453 if (nip->i_entries > 2) {
1459 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC);
1463 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
1475 if (!ndip->i_inode.i_nlink) {
1479 if (ndip->i_entries == (u32)-1) {
1483 if (S_ISDIR(ip->i_inode.i_mode) &&
1484 ndip->i_inode.i_nlink == (u32)-1) {
1491 /* Check out the dir to be renamed */
1494 error = gfs2_permission(d_inode(odentry), MAY_WRITE);
1500 error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da);
1506 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
1507 error = gfs2_quota_lock_check(ndip, &ap);
1511 error = gfs2_inplace_reserve(ndip, &ap);
1515 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) +
1516 4 * RES_LEAF + 4, 0);
1520 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
1521 5 * RES_LEAF + 4, 0);
1526 /* Remove the target file, if it exists */
1529 error = gfs2_unlink_inode(ndip, ndentry);
1531 error = update_moved_ino(ip, ndip, dir_rename);
1535 error = gfs2_dir_del(odip, odentry);
1539 error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da);
1544 gfs2_trans_end(sdp);
1547 gfs2_inplace_release(ndip);
1550 gfs2_quota_unlock(ndip);
1552 gfs2_dir_no_add(&da);
1554 gfs2_glock_dq(ghs + x);
1555 gfs2_holder_uninit(ghs + x);
1558 if (gfs2_holder_initialized(&r_gh))
1559 gfs2_glock_dq_uninit(&r_gh);
1565 * gfs2_exchange - exchange two files
1566 * @odir: Parent directory of old file name
1567 * @odentry: The old dentry of the file
1568 * @ndir: Parent directory of new file name
1569 * @ndentry: The new dentry of the file
1570 * @flags: The rename flags
1575 static int gfs2_exchange(struct inode *odir, struct dentry *odentry,
1576 struct inode *ndir, struct dentry *ndentry,
1579 struct gfs2_inode *odip = GFS2_I(odir);
1580 struct gfs2_inode *ndip = GFS2_I(ndir);
1581 struct gfs2_inode *oip = GFS2_I(odentry->d_inode);
1582 struct gfs2_inode *nip = GFS2_I(ndentry->d_inode);
1583 struct gfs2_sbd *sdp = GFS2_SB(odir);
1584 struct gfs2_holder ghs[5], r_gh;
1585 unsigned int num_gh;
1587 umode_t old_mode = oip->i_inode.i_mode;
1588 umode_t new_mode = nip->i_inode.i_mode;
1591 gfs2_holder_mark_uninitialized(&r_gh);
1592 error = gfs2_rindex_update(sdp);
1597 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1602 if (S_ISDIR(old_mode)) {
1603 /* don't move a directory into its subdir */
1604 error = gfs2_ok_to_move(oip, ndip);
1609 if (S_ISDIR(new_mode)) {
1610 /* don't move a directory into its subdir */
1611 error = gfs2_ok_to_move(nip, odip);
1618 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1620 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1623 gfs2_holder_init(oip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1626 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1629 for (x = 0; x < num_gh; x++) {
1630 error = gfs2_glock_nq(ghs + x);
1636 if (oip->i_inode.i_nlink == 0 || nip->i_inode.i_nlink == 0)
1639 error = gfs2_unlink_ok(odip, &odentry->d_name, oip);
1642 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1646 if (S_ISDIR(old_mode)) {
1647 error = gfs2_permission(odentry->d_inode, MAY_WRITE);
1651 if (S_ISDIR(new_mode)) {
1652 error = gfs2_permission(ndentry->d_inode, MAY_WRITE);
1656 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 4 * RES_LEAF, 0);
1660 error = update_moved_ino(oip, ndip, S_ISDIR(old_mode));
1664 error = update_moved_ino(nip, odip, S_ISDIR(new_mode));
1668 error = gfs2_dir_mvino(ndip, &ndentry->d_name, oip,
1673 error = gfs2_dir_mvino(odip, &odentry->d_name, nip,
1679 if (S_ISDIR(new_mode) && !S_ISDIR(old_mode)) {
1680 inc_nlink(&odip->i_inode);
1681 drop_nlink(&ndip->i_inode);
1682 } else if (S_ISDIR(old_mode) && !S_ISDIR(new_mode)) {
1683 inc_nlink(&ndip->i_inode);
1684 drop_nlink(&odip->i_inode);
1687 mark_inode_dirty(&ndip->i_inode);
1689 mark_inode_dirty(&odip->i_inode);
1692 gfs2_trans_end(sdp);
1695 gfs2_glock_dq(ghs + x);
1696 gfs2_holder_uninit(ghs + x);
1699 if (gfs2_holder_initialized(&r_gh))
1700 gfs2_glock_dq_uninit(&r_gh);
1705 static int gfs2_rename2(struct inode *odir, struct dentry *odentry,
1706 struct inode *ndir, struct dentry *ndentry,
1709 flags &= ~RENAME_NOREPLACE;
1711 if (flags & ~RENAME_EXCHANGE)
1714 if (flags & RENAME_EXCHANGE)
1715 return gfs2_exchange(odir, odentry, ndir, ndentry, flags);
1717 return gfs2_rename(odir, odentry, ndir, ndentry);
1721 * gfs2_get_link - Follow a symbolic link
1722 * @dentry: The dentry of the link
1723 * @inode: The inode of the link
1724 * @done: destructor for return value
1726 * This can handle symlinks of any size.
1728 * Returns: 0 on success or error code
1731 static const char *gfs2_get_link(struct dentry *dentry,
1732 struct inode *inode,
1733 struct delayed_call *done)
1735 struct gfs2_inode *ip = GFS2_I(inode);
1736 struct gfs2_holder i_gh;
1737 struct buffer_head *dibh;
1743 return ERR_PTR(-ECHILD);
1745 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1746 error = gfs2_glock_nq(&i_gh);
1748 gfs2_holder_uninit(&i_gh);
1749 return ERR_PTR(error);
1752 size = (unsigned int)i_size_read(&ip->i_inode);
1754 gfs2_consist_inode(ip);
1755 buf = ERR_PTR(-EIO);
1759 error = gfs2_meta_inode_buffer(ip, &dibh);
1761 buf = ERR_PTR(error);
1765 buf = kzalloc(size + 1, GFP_NOFS);
1767 buf = ERR_PTR(-ENOMEM);
1769 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
1772 gfs2_glock_dq_uninit(&i_gh);
1774 set_delayed_call(done, kfree_link, buf);
1781 * @mask: The mask to be tested
1782 * @flags: Indicates whether this is an RCU path walk or not
1784 * This may be called from the VFS directly, or from within GFS2 with the
1785 * inode locked, so we look to see if the glock is already locked and only
1786 * lock the glock if its not already been done.
1791 int gfs2_permission(struct inode *inode, int mask)
1793 struct gfs2_inode *ip;
1794 struct gfs2_holder i_gh;
1797 gfs2_holder_mark_uninitialized(&i_gh);
1799 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1800 if (mask & MAY_NOT_BLOCK)
1802 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1807 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1810 error = generic_permission(inode, mask);
1811 if (gfs2_holder_initialized(&i_gh))
1812 gfs2_glock_dq_uninit(&i_gh);
1817 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1819 setattr_copy(inode, attr);
1820 mark_inode_dirty(inode);
1825 * gfs2_setattr_simple -
1832 int gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1836 if (current->journal_info)
1837 return __gfs2_setattr_simple(inode, attr);
1839 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0);
1843 error = __gfs2_setattr_simple(inode, attr);
1844 gfs2_trans_end(GFS2_SB(inode));
1848 static int setattr_chown(struct inode *inode, struct iattr *attr)
1850 struct gfs2_inode *ip = GFS2_I(inode);
1851 struct gfs2_sbd *sdp = GFS2_SB(inode);
1855 struct gfs2_alloc_parms ap;
1857 ouid = inode->i_uid;
1858 ogid = inode->i_gid;
1859 nuid = attr->ia_uid;
1860 ngid = attr->ia_gid;
1862 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid))
1863 ouid = nuid = NO_UID_QUOTA_CHANGE;
1864 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid))
1865 ogid = ngid = NO_GID_QUOTA_CHANGE;
1867 error = gfs2_rsqa_alloc(ip);
1871 error = gfs2_rindex_update(sdp);
1875 error = gfs2_quota_lock(ip, nuid, ngid);
1879 ap.target = gfs2_get_inode_blocks(&ip->i_inode);
1881 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1882 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1883 error = gfs2_quota_check(ip, nuid, ngid, &ap);
1888 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1892 error = gfs2_setattr_simple(inode, attr);
1896 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1897 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1898 gfs2_quota_change(ip, -(s64)ap.target, ouid, ogid);
1899 gfs2_quota_change(ip, ap.target, nuid, ngid);
1903 gfs2_trans_end(sdp);
1905 gfs2_quota_unlock(ip);
1911 * gfs2_setattr - Change attributes on an inode
1912 * @dentry: The dentry which is changing
1913 * @attr: The structure describing the change
1915 * The VFS layer wants to change one or more of an inodes attributes. Write
1916 * that change out to disk.
1921 static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
1923 struct inode *inode = d_inode(dentry);
1924 struct gfs2_inode *ip = GFS2_I(inode);
1925 struct gfs2_holder i_gh;
1928 error = gfs2_rsqa_alloc(ip);
1932 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1937 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1940 error = setattr_prepare(dentry, attr);
1944 if (attr->ia_valid & ATTR_SIZE)
1945 error = gfs2_setattr_size(inode, attr->ia_size);
1946 else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1947 error = setattr_chown(inode, attr);
1949 error = gfs2_setattr_simple(inode, attr);
1950 if (!error && attr->ia_valid & ATTR_MODE)
1951 error = posix_acl_chmod(inode, inode->i_mode);
1956 mark_inode_dirty(inode);
1957 gfs2_glock_dq_uninit(&i_gh);
1962 * gfs2_getattr - Read out an inode's attributes
1963 * @path: Object to query
1964 * @stat: The inode's stats
1965 * @request_mask: Mask of STATX_xxx flags indicating the caller's interests
1966 * @flags: AT_STATX_xxx setting
1968 * This may be called from the VFS directly, or from within GFS2 with the
1969 * inode locked, so we look to see if the glock is already locked and only
1970 * lock the glock if its not already been done. Note that its the NFS
1971 * readdirplus operation which causes this to be called (from filldir)
1972 * with the glock already held.
1977 static int gfs2_getattr(const struct path *path, struct kstat *stat,
1978 u32 request_mask, unsigned int flags)
1980 struct inode *inode = d_inode(path->dentry);
1981 struct gfs2_inode *ip = GFS2_I(inode);
1982 struct gfs2_holder gh;
1985 gfs2_holder_mark_uninitialized(&gh);
1986 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1987 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1992 generic_fillattr(inode, stat);
1993 if (gfs2_holder_initialized(&gh))
1994 gfs2_glock_dq_uninit(&gh);
1999 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
2002 struct gfs2_inode *ip = GFS2_I(inode);
2003 struct gfs2_holder gh;
2006 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
2012 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2016 if (gfs2_is_stuffed(ip)) {
2017 u64 phys = ip->i_no_addr << inode->i_blkbits;
2018 u64 size = i_size_read(inode);
2019 u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED|
2020 FIEMAP_EXTENT_DATA_INLINE;
2021 phys += sizeof(struct gfs2_dinode);
2023 if (start + len > size)
2026 ret = fiemap_fill_next_extent(fieinfo, start, phys,
2031 ret = __generic_block_fiemap(inode, fieinfo, start, len,
2035 gfs2_glock_dq_uninit(&gh);
2037 inode_unlock(inode);
2041 const struct inode_operations gfs2_file_iops = {
2042 .permission = gfs2_permission,
2043 .setattr = gfs2_setattr,
2044 .getattr = gfs2_getattr,
2045 .listxattr = gfs2_listxattr,
2046 .fiemap = gfs2_fiemap,
2047 .get_acl = gfs2_get_acl,
2048 .set_acl = gfs2_set_acl,
2051 const struct inode_operations gfs2_dir_iops = {
2052 .create = gfs2_create,
2053 .lookup = gfs2_lookup,
2055 .unlink = gfs2_unlink,
2056 .symlink = gfs2_symlink,
2057 .mkdir = gfs2_mkdir,
2058 .rmdir = gfs2_unlink,
2059 .mknod = gfs2_mknod,
2060 .rename = gfs2_rename2,
2061 .permission = gfs2_permission,
2062 .setattr = gfs2_setattr,
2063 .getattr = gfs2_getattr,
2064 .listxattr = gfs2_listxattr,
2065 .fiemap = gfs2_fiemap,
2066 .get_acl = gfs2_get_acl,
2067 .set_acl = gfs2_set_acl,
2068 .atomic_open = gfs2_atomic_open,
2071 const struct inode_operations gfs2_symlink_iops = {
2072 .get_link = gfs2_get_link,
2073 .permission = gfs2_permission,
2074 .setattr = gfs2_setattr,
2075 .getattr = gfs2_getattr,
2076 .listxattr = gfs2_listxattr,
2077 .fiemap = gfs2_fiemap,