1 /* * This file is part of UBIFS.
3 * Copyright (C) 2006-2008 Nokia Corporation.
4 * Copyright (C) 2006, 2007 University of Szeged, Hungary
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 as published by
8 * the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15 * You should have received a copy of the GNU General Public License along with
16 * this program; if not, write to the Free Software Foundation, Inc., 51
17 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19 * Authors: Artem Bityutskiy (Битюцкий Артём)
25 * This file implements directory operations.
27 * All FS operations in this file allocate budget before writing anything to the
28 * media. If they fail to allocate it, the error is returned. The only
29 * exceptions are 'ubifs_unlink()' and 'ubifs_rmdir()' which keep working even
30 * if they unable to allocate the budget, because deletion %-ENOSPC failure is
31 * not what users are usually ready to get. UBIFS budgeting subsystem has some
32 * space reserved for these purposes.
34 * All operations in this file write all inodes which they change straight
35 * away, instead of marking them dirty. For example, 'ubifs_link()' changes
36 * @i_size of the parent inode and writes the parent inode together with the
37 * target inode. This was done to simplify file-system recovery which would
38 * otherwise be very difficult to do. The only exception is rename which marks
39 * the re-named inode dirty (because its @i_ctime is updated) but does not
40 * write it, but just marks it as dirty.
46 * inherit_flags - inherit flags of the parent inode.
48 * @mode: new inode mode flags
50 * This is a helper function for 'ubifs_new_inode()' which inherits flag of the
51 * parent directory inode @dir. UBIFS inodes inherit the following flags:
52 * o %UBIFS_COMPR_FL, which is useful to switch compression on/of on
53 * sub-directory basis;
54 * o %UBIFS_SYNC_FL - useful for the same reasons;
55 * o %UBIFS_DIRSYNC_FL - similar, but relevant only to directories.
57 * This function returns the inherited flags.
59 static int inherit_flags(const struct inode
*dir
, umode_t mode
)
62 const struct ubifs_inode
*ui
= ubifs_inode(dir
);
64 if (!S_ISDIR(dir
->i_mode
))
66 * The parent is not a directory, which means that an extended
67 * attribute inode is being created. No flags.
71 flags
= ui
->flags
& (UBIFS_COMPR_FL
| UBIFS_SYNC_FL
| UBIFS_DIRSYNC_FL
);
73 /* The "DIRSYNC" flag only applies to directories */
74 flags
&= ~UBIFS_DIRSYNC_FL
;
79 * ubifs_new_inode - allocate new UBIFS inode object.
80 * @c: UBIFS file-system description object
81 * @dir: parent directory inode
82 * @mode: inode mode flags
84 * This function finds an unused inode number, allocates new inode and
85 * initializes it. Returns new inode in case of success and an error code in
88 struct inode
*ubifs_new_inode(struct ubifs_info
*c
, const struct inode
*dir
,
92 struct ubifs_inode
*ui
;
94 inode
= new_inode(c
->vfs_sb
);
95 ui
= ubifs_inode(inode
);
97 return ERR_PTR(-ENOMEM
);
100 * Set 'S_NOCMTIME' to prevent VFS form updating [mc]time of inodes and
101 * marking them dirty in file write path (see 'file_update_time()').
102 * UBIFS has to fully control "clean <-> dirty" transitions of inodes
103 * to make budgeting work.
105 inode
->i_flags
|= S_NOCMTIME
;
107 inode_init_owner(inode
, dir
, mode
);
108 inode
->i_mtime
= inode
->i_atime
= inode
->i_ctime
=
109 ubifs_current_time(inode
);
110 inode
->i_mapping
->nrpages
= 0;
111 /* Disable readahead */
112 inode
->i_mapping
->backing_dev_info
= &c
->bdi
;
114 switch (mode
& S_IFMT
) {
116 inode
->i_mapping
->a_ops
= &ubifs_file_address_operations
;
117 inode
->i_op
= &ubifs_file_inode_operations
;
118 inode
->i_fop
= &ubifs_file_operations
;
121 inode
->i_op
= &ubifs_dir_inode_operations
;
122 inode
->i_fop
= &ubifs_dir_operations
;
123 inode
->i_size
= ui
->ui_size
= UBIFS_INO_NODE_SZ
;
126 inode
->i_op
= &ubifs_symlink_inode_operations
;
132 inode
->i_op
= &ubifs_file_inode_operations
;
138 ui
->flags
= inherit_flags(dir
, mode
);
139 ubifs_set_inode_flags(inode
);
141 ui
->compr_type
= c
->default_compr
;
143 ui
->compr_type
= UBIFS_COMPR_NONE
;
144 ui
->synced_i_size
= 0;
146 spin_lock(&c
->cnt_lock
);
147 /* Inode number overflow is currently not supported */
148 if (c
->highest_inum
>= INUM_WARN_WATERMARK
) {
149 if (c
->highest_inum
>= INUM_WATERMARK
) {
150 spin_unlock(&c
->cnt_lock
);
151 ubifs_err("out of inode numbers");
152 make_bad_inode(inode
);
154 return ERR_PTR(-EINVAL
);
156 ubifs_warn("running out of inode numbers (current %lu, max %d)",
157 (unsigned long)c
->highest_inum
, INUM_WATERMARK
);
160 inode
->i_ino
= ++c
->highest_inum
;
162 * The creation sequence number remains with this inode for its
163 * lifetime. All nodes for this inode have a greater sequence number,
164 * and so it is possible to distinguish obsolete nodes belonging to a
165 * previous incarnation of the same inode number - for example, for the
166 * purpose of rebuilding the index.
168 ui
->creat_sqnum
= ++c
->max_sqnum
;
169 spin_unlock(&c
->cnt_lock
);
173 static int dbg_check_name(const struct ubifs_info
*c
,
174 const struct ubifs_dent_node
*dent
,
175 const struct qstr
*nm
)
177 if (!dbg_is_chk_gen(c
))
179 if (le16_to_cpu(dent
->nlen
) != nm
->len
)
181 if (memcmp(dent
->name
, nm
->name
, nm
->len
))
186 static struct dentry
*ubifs_lookup(struct inode
*dir
, struct dentry
*dentry
,
191 struct inode
*inode
= NULL
;
192 struct ubifs_dent_node
*dent
;
193 struct ubifs_info
*c
= dir
->i_sb
->s_fs_info
;
195 dbg_gen("'%.*s' in dir ino %lu",
196 dentry
->d_name
.len
, dentry
->d_name
.name
, dir
->i_ino
);
198 if (dentry
->d_name
.len
> UBIFS_MAX_NLEN
)
199 return ERR_PTR(-ENAMETOOLONG
);
201 dent
= kmalloc(UBIFS_MAX_DENT_NODE_SZ
, GFP_NOFS
);
203 return ERR_PTR(-ENOMEM
);
205 dent_key_init(c
, &key
, dir
->i_ino
, &dentry
->d_name
);
207 err
= ubifs_tnc_lookup_nm(c
, &key
, dent
, &dentry
->d_name
);
209 if (err
== -ENOENT
) {
210 dbg_gen("not found");
216 if (dbg_check_name(c
, dent
, &dentry
->d_name
)) {
221 inode
= ubifs_iget(dir
->i_sb
, le64_to_cpu(dent
->inum
));
224 * This should not happen. Probably the file-system needs
227 err
= PTR_ERR(inode
);
228 ubifs_err("dead directory entry '%.*s', error %d",
229 dentry
->d_name
.len
, dentry
->d_name
.name
, err
);
230 ubifs_ro_mode(c
, err
);
237 * Note, d_splice_alias() would be required instead if we supported
240 d_add(dentry
, inode
);
248 static int ubifs_create(struct inode
*dir
, struct dentry
*dentry
, umode_t mode
,
252 struct ubifs_info
*c
= dir
->i_sb
->s_fs_info
;
253 int err
, sz_change
= CALC_DENT_SIZE(dentry
->d_name
.len
);
254 struct ubifs_budget_req req
= { .new_ino
= 1, .new_dent
= 1,
256 struct ubifs_inode
*dir_ui
= ubifs_inode(dir
);
259 * Budget request settings: new inode, new direntry, changing the
260 * parent directory inode.
263 dbg_gen("dent '%.*s', mode %#hx in dir ino %lu",
264 dentry
->d_name
.len
, dentry
->d_name
.name
, mode
, dir
->i_ino
);
266 err
= ubifs_budget_space(c
, &req
);
270 inode
= ubifs_new_inode(c
, dir
, mode
);
272 err
= PTR_ERR(inode
);
276 mutex_lock(&dir_ui
->ui_mutex
);
277 dir
->i_size
+= sz_change
;
278 dir_ui
->ui_size
= dir
->i_size
;
279 dir
->i_mtime
= dir
->i_ctime
= inode
->i_ctime
;
280 err
= ubifs_jnl_update(c
, dir
, &dentry
->d_name
, inode
, 0, 0);
283 mutex_unlock(&dir_ui
->ui_mutex
);
285 ubifs_release_budget(c
, &req
);
286 insert_inode_hash(inode
);
287 d_instantiate(dentry
, inode
);
291 dir
->i_size
-= sz_change
;
292 dir_ui
->ui_size
= dir
->i_size
;
293 mutex_unlock(&dir_ui
->ui_mutex
);
294 make_bad_inode(inode
);
297 ubifs_release_budget(c
, &req
);
298 ubifs_err("cannot create regular file, error %d", err
);
303 * vfs_dent_type - get VFS directory entry type.
304 * @type: UBIFS directory entry type
306 * This function converts UBIFS directory entry type into VFS directory entry
309 static unsigned int vfs_dent_type(uint8_t type
)
312 case UBIFS_ITYPE_REG
:
314 case UBIFS_ITYPE_DIR
:
316 case UBIFS_ITYPE_LNK
:
318 case UBIFS_ITYPE_BLK
:
320 case UBIFS_ITYPE_CHR
:
322 case UBIFS_ITYPE_FIFO
:
324 case UBIFS_ITYPE_SOCK
:
333 * The classical Unix view for directory is that it is a linear array of
334 * (name, inode number) entries. Linux/VFS assumes this model as well.
335 * Particularly, 'readdir()' call wants us to return a directory entry offset
336 * which later may be used to continue 'readdir()'ing the directory or to
337 * 'seek()' to that specific direntry. Obviously UBIFS does not really fit this
338 * model because directory entries are identified by keys, which may collide.
340 * UBIFS uses directory entry hash value for directory offsets, so
341 * 'seekdir()'/'telldir()' may not always work because of possible key
342 * collisions. But UBIFS guarantees that consecutive 'readdir()' calls work
343 * properly by means of saving full directory entry name in the private field
344 * of the file description object.
346 * This means that UBIFS cannot support NFS which requires full
347 * 'seekdir()'/'telldir()' support.
349 static int ubifs_readdir(struct file
*file
, void *dirent
, filldir_t filldir
)
354 struct ubifs_dent_node
*dent
;
355 struct inode
*dir
= file
->f_path
.dentry
->d_inode
;
356 struct ubifs_info
*c
= dir
->i_sb
->s_fs_info
;
358 dbg_gen("dir ino %lu, f_pos %#llx", dir
->i_ino
, file
->f_pos
);
360 if (file
->f_pos
> UBIFS_S_KEY_HASH_MASK
|| file
->f_pos
== 2)
362 * The directory was seek'ed to a senseless position or there
363 * are no more entries.
367 /* File positions 0 and 1 correspond to "." and ".." */
368 if (file
->f_pos
== 0) {
369 ubifs_assert(!file
->private_data
);
370 over
= filldir(dirent
, ".", 1, 0, dir
->i_ino
, DT_DIR
);
376 if (file
->f_pos
== 1) {
377 ubifs_assert(!file
->private_data
);
378 over
= filldir(dirent
, "..", 2, 1,
379 parent_ino(file
->f_path
.dentry
), DT_DIR
);
383 /* Find the first entry in TNC and save it */
384 lowest_dent_key(c
, &key
, dir
->i_ino
);
386 dent
= ubifs_tnc_next_ent(c
, &key
, &nm
);
392 file
->f_pos
= key_hash_flash(c
, &dent
->key
);
393 file
->private_data
= dent
;
396 dent
= file
->private_data
;
399 * The directory was seek'ed to and is now readdir'ed.
400 * Find the entry corresponding to @file->f_pos or the
403 dent_key_init_hash(c
, &key
, dir
->i_ino
, file
->f_pos
);
405 dent
= ubifs_tnc_next_ent(c
, &key
, &nm
);
410 file
->f_pos
= key_hash_flash(c
, &dent
->key
);
411 file
->private_data
= dent
;
415 dbg_gen("feed '%s', ino %llu, new f_pos %#x",
416 dent
->name
, (unsigned long long)le64_to_cpu(dent
->inum
),
417 key_hash_flash(c
, &dent
->key
));
418 ubifs_assert(le64_to_cpu(dent
->ch
.sqnum
) >
419 ubifs_inode(dir
)->creat_sqnum
);
421 nm
.len
= le16_to_cpu(dent
->nlen
);
422 over
= filldir(dirent
, dent
->name
, nm
.len
, file
->f_pos
,
423 le64_to_cpu(dent
->inum
),
424 vfs_dent_type(dent
->type
));
428 /* Switch to the next entry */
429 key_read(c
, &dent
->key
, &key
);
430 nm
.name
= dent
->name
;
431 dent
= ubifs_tnc_next_ent(c
, &key
, &nm
);
437 kfree(file
->private_data
);
438 file
->f_pos
= key_hash_flash(c
, &dent
->key
);
439 file
->private_data
= dent
;
444 if (err
!= -ENOENT
) {
445 ubifs_err("cannot find next direntry, error %d", err
);
449 kfree(file
->private_data
);
450 file
->private_data
= NULL
;
455 /* If a directory is seeked, we have to free saved readdir() state */
456 static loff_t
ubifs_dir_llseek(struct file
*file
, loff_t offset
, int whence
)
458 kfree(file
->private_data
);
459 file
->private_data
= NULL
;
460 return generic_file_llseek(file
, offset
, whence
);
463 /* Free saved readdir() state when the directory is closed */
464 static int ubifs_dir_release(struct inode
*dir
, struct file
*file
)
466 kfree(file
->private_data
);
467 file
->private_data
= NULL
;
472 * lock_2_inodes - a wrapper for locking two UBIFS inodes.
473 * @inode1: first inode
474 * @inode2: second inode
476 * We do not implement any tricks to guarantee strict lock ordering, because
477 * VFS has already done it for us on the @i_mutex. So this is just a simple
480 static void lock_2_inodes(struct inode
*inode1
, struct inode
*inode2
)
482 mutex_lock_nested(&ubifs_inode(inode1
)->ui_mutex
, WB_MUTEX_1
);
483 mutex_lock_nested(&ubifs_inode(inode2
)->ui_mutex
, WB_MUTEX_2
);
487 * unlock_2_inodes - a wrapper for unlocking two UBIFS inodes.
488 * @inode1: first inode
489 * @inode2: second inode
491 static void unlock_2_inodes(struct inode
*inode1
, struct inode
*inode2
)
493 mutex_unlock(&ubifs_inode(inode2
)->ui_mutex
);
494 mutex_unlock(&ubifs_inode(inode1
)->ui_mutex
);
497 static int ubifs_link(struct dentry
*old_dentry
, struct inode
*dir
,
498 struct dentry
*dentry
)
500 struct ubifs_info
*c
= dir
->i_sb
->s_fs_info
;
501 struct inode
*inode
= old_dentry
->d_inode
;
502 struct ubifs_inode
*ui
= ubifs_inode(inode
);
503 struct ubifs_inode
*dir_ui
= ubifs_inode(dir
);
504 int err
, sz_change
= CALC_DENT_SIZE(dentry
->d_name
.len
);
505 struct ubifs_budget_req req
= { .new_dent
= 1, .dirtied_ino
= 2,
506 .dirtied_ino_d
= ALIGN(ui
->data_len
, 8) };
509 * Budget request settings: new direntry, changing the target inode,
510 * changing the parent inode.
513 dbg_gen("dent '%.*s' to ino %lu (nlink %d) in dir ino %lu",
514 dentry
->d_name
.len
, dentry
->d_name
.name
, inode
->i_ino
,
515 inode
->i_nlink
, dir
->i_ino
);
516 ubifs_assert(mutex_is_locked(&dir
->i_mutex
));
517 ubifs_assert(mutex_is_locked(&inode
->i_mutex
));
519 err
= dbg_check_synced_i_size(c
, inode
);
523 err
= ubifs_budget_space(c
, &req
);
527 lock_2_inodes(dir
, inode
);
530 inode
->i_ctime
= ubifs_current_time(inode
);
531 dir
->i_size
+= sz_change
;
532 dir_ui
->ui_size
= dir
->i_size
;
533 dir
->i_mtime
= dir
->i_ctime
= inode
->i_ctime
;
534 err
= ubifs_jnl_update(c
, dir
, &dentry
->d_name
, inode
, 0, 0);
537 unlock_2_inodes(dir
, inode
);
539 ubifs_release_budget(c
, &req
);
540 d_instantiate(dentry
, inode
);
544 dir
->i_size
-= sz_change
;
545 dir_ui
->ui_size
= dir
->i_size
;
547 unlock_2_inodes(dir
, inode
);
548 ubifs_release_budget(c
, &req
);
553 static int ubifs_unlink(struct inode
*dir
, struct dentry
*dentry
)
555 struct ubifs_info
*c
= dir
->i_sb
->s_fs_info
;
556 struct inode
*inode
= dentry
->d_inode
;
557 struct ubifs_inode
*dir_ui
= ubifs_inode(dir
);
558 int sz_change
= CALC_DENT_SIZE(dentry
->d_name
.len
);
559 int err
, budgeted
= 1;
560 struct ubifs_budget_req req
= { .mod_dent
= 1, .dirtied_ino
= 2 };
561 unsigned int saved_nlink
= inode
->i_nlink
;
564 * Budget request settings: deletion direntry, deletion inode (+1 for
565 * @dirtied_ino), changing the parent directory inode. If budgeting
566 * fails, go ahead anyway because we have extra space reserved for
570 dbg_gen("dent '%.*s' from ino %lu (nlink %d) in dir ino %lu",
571 dentry
->d_name
.len
, dentry
->d_name
.name
, inode
->i_ino
,
572 inode
->i_nlink
, dir
->i_ino
);
573 ubifs_assert(mutex_is_locked(&dir
->i_mutex
));
574 ubifs_assert(mutex_is_locked(&inode
->i_mutex
));
575 err
= dbg_check_synced_i_size(c
, inode
);
579 err
= ubifs_budget_space(c
, &req
);
586 lock_2_inodes(dir
, inode
);
587 inode
->i_ctime
= ubifs_current_time(dir
);
589 dir
->i_size
-= sz_change
;
590 dir_ui
->ui_size
= dir
->i_size
;
591 dir
->i_mtime
= dir
->i_ctime
= inode
->i_ctime
;
592 err
= ubifs_jnl_update(c
, dir
, &dentry
->d_name
, inode
, 1, 0);
595 unlock_2_inodes(dir
, inode
);
598 ubifs_release_budget(c
, &req
);
600 /* We've deleted something - clean the "no space" flags */
601 c
->bi
.nospace
= c
->bi
.nospace_rp
= 0;
607 dir
->i_size
+= sz_change
;
608 dir_ui
->ui_size
= dir
->i_size
;
609 set_nlink(inode
, saved_nlink
);
610 unlock_2_inodes(dir
, inode
);
612 ubifs_release_budget(c
, &req
);
617 * check_dir_empty - check if a directory is empty or not.
618 * @c: UBIFS file-system description object
619 * @dir: VFS inode object of the directory to check
621 * This function checks if directory @dir is empty. Returns zero if the
622 * directory is empty, %-ENOTEMPTY if it is not, and other negative error codes
623 * in case of of errors.
625 static int check_dir_empty(struct ubifs_info
*c
, struct inode
*dir
)
627 struct qstr nm
= { .name
= NULL
};
628 struct ubifs_dent_node
*dent
;
632 lowest_dent_key(c
, &key
, dir
->i_ino
);
633 dent
= ubifs_tnc_next_ent(c
, &key
, &nm
);
645 static int ubifs_rmdir(struct inode
*dir
, struct dentry
*dentry
)
647 struct ubifs_info
*c
= dir
->i_sb
->s_fs_info
;
648 struct inode
*inode
= dentry
->d_inode
;
649 int sz_change
= CALC_DENT_SIZE(dentry
->d_name
.len
);
650 int err
, budgeted
= 1;
651 struct ubifs_inode
*dir_ui
= ubifs_inode(dir
);
652 struct ubifs_budget_req req
= { .mod_dent
= 1, .dirtied_ino
= 2 };
655 * Budget request settings: deletion direntry, deletion inode and
656 * changing the parent inode. If budgeting fails, go ahead anyway
657 * because we have extra space reserved for deletions.
660 dbg_gen("directory '%.*s', ino %lu in dir ino %lu", dentry
->d_name
.len
,
661 dentry
->d_name
.name
, inode
->i_ino
, dir
->i_ino
);
662 ubifs_assert(mutex_is_locked(&dir
->i_mutex
));
663 ubifs_assert(mutex_is_locked(&inode
->i_mutex
));
664 err
= check_dir_empty(c
, dentry
->d_inode
);
668 err
= ubifs_budget_space(c
, &req
);
675 lock_2_inodes(dir
, inode
);
676 inode
->i_ctime
= ubifs_current_time(dir
);
679 dir
->i_size
-= sz_change
;
680 dir_ui
->ui_size
= dir
->i_size
;
681 dir
->i_mtime
= dir
->i_ctime
= inode
->i_ctime
;
682 err
= ubifs_jnl_update(c
, dir
, &dentry
->d_name
, inode
, 1, 0);
685 unlock_2_inodes(dir
, inode
);
688 ubifs_release_budget(c
, &req
);
690 /* We've deleted something - clean the "no space" flags */
691 c
->bi
.nospace
= c
->bi
.nospace_rp
= 0;
697 dir
->i_size
+= sz_change
;
698 dir_ui
->ui_size
= dir
->i_size
;
701 unlock_2_inodes(dir
, inode
);
703 ubifs_release_budget(c
, &req
);
707 static int ubifs_mkdir(struct inode
*dir
, struct dentry
*dentry
, umode_t mode
)
710 struct ubifs_inode
*dir_ui
= ubifs_inode(dir
);
711 struct ubifs_info
*c
= dir
->i_sb
->s_fs_info
;
712 int err
, sz_change
= CALC_DENT_SIZE(dentry
->d_name
.len
);
713 struct ubifs_budget_req req
= { .new_ino
= 1, .new_dent
= 1 };
716 * Budget request settings: new inode, new direntry and changing parent
720 dbg_gen("dent '%.*s', mode %#hx in dir ino %lu",
721 dentry
->d_name
.len
, dentry
->d_name
.name
, mode
, dir
->i_ino
);
723 err
= ubifs_budget_space(c
, &req
);
727 inode
= ubifs_new_inode(c
, dir
, S_IFDIR
| mode
);
729 err
= PTR_ERR(inode
);
733 mutex_lock(&dir_ui
->ui_mutex
);
734 insert_inode_hash(inode
);
737 dir
->i_size
+= sz_change
;
738 dir_ui
->ui_size
= dir
->i_size
;
739 dir
->i_mtime
= dir
->i_ctime
= inode
->i_ctime
;
740 err
= ubifs_jnl_update(c
, dir
, &dentry
->d_name
, inode
, 0, 0);
742 ubifs_err("cannot create directory, error %d", err
);
745 mutex_unlock(&dir_ui
->ui_mutex
);
747 ubifs_release_budget(c
, &req
);
748 d_instantiate(dentry
, inode
);
752 dir
->i_size
-= sz_change
;
753 dir_ui
->ui_size
= dir
->i_size
;
755 mutex_unlock(&dir_ui
->ui_mutex
);
756 make_bad_inode(inode
);
759 ubifs_release_budget(c
, &req
);
763 static int ubifs_mknod(struct inode
*dir
, struct dentry
*dentry
,
764 umode_t mode
, dev_t rdev
)
767 struct ubifs_inode
*ui
;
768 struct ubifs_inode
*dir_ui
= ubifs_inode(dir
);
769 struct ubifs_info
*c
= dir
->i_sb
->s_fs_info
;
770 union ubifs_dev_desc
*dev
= NULL
;
771 int sz_change
= CALC_DENT_SIZE(dentry
->d_name
.len
);
773 struct ubifs_budget_req req
= { .new_ino
= 1, .new_dent
= 1,
774 .new_ino_d
= ALIGN(devlen
, 8),
778 * Budget request settings: new inode, new direntry and changing parent
782 dbg_gen("dent '%.*s' in dir ino %lu",
783 dentry
->d_name
.len
, dentry
->d_name
.name
, dir
->i_ino
);
785 if (!new_valid_dev(rdev
))
788 if (S_ISBLK(mode
) || S_ISCHR(mode
)) {
789 dev
= kmalloc(sizeof(union ubifs_dev_desc
), GFP_NOFS
);
792 devlen
= ubifs_encode_dev(dev
, rdev
);
795 err
= ubifs_budget_space(c
, &req
);
801 inode
= ubifs_new_inode(c
, dir
, mode
);
804 err
= PTR_ERR(inode
);
808 init_special_inode(inode
, inode
->i_mode
, rdev
);
809 inode
->i_size
= ubifs_inode(inode
)->ui_size
= devlen
;
810 ui
= ubifs_inode(inode
);
812 ui
->data_len
= devlen
;
814 mutex_lock(&dir_ui
->ui_mutex
);
815 dir
->i_size
+= sz_change
;
816 dir_ui
->ui_size
= dir
->i_size
;
817 dir
->i_mtime
= dir
->i_ctime
= inode
->i_ctime
;
818 err
= ubifs_jnl_update(c
, dir
, &dentry
->d_name
, inode
, 0, 0);
821 mutex_unlock(&dir_ui
->ui_mutex
);
823 ubifs_release_budget(c
, &req
);
824 insert_inode_hash(inode
);
825 d_instantiate(dentry
, inode
);
829 dir
->i_size
-= sz_change
;
830 dir_ui
->ui_size
= dir
->i_size
;
831 mutex_unlock(&dir_ui
->ui_mutex
);
832 make_bad_inode(inode
);
835 ubifs_release_budget(c
, &req
);
839 static int ubifs_symlink(struct inode
*dir
, struct dentry
*dentry
,
843 struct ubifs_inode
*ui
;
844 struct ubifs_inode
*dir_ui
= ubifs_inode(dir
);
845 struct ubifs_info
*c
= dir
->i_sb
->s_fs_info
;
846 int err
, len
= strlen(symname
);
847 int sz_change
= CALC_DENT_SIZE(dentry
->d_name
.len
);
848 struct ubifs_budget_req req
= { .new_ino
= 1, .new_dent
= 1,
849 .new_ino_d
= ALIGN(len
, 8),
853 * Budget request settings: new inode, new direntry and changing parent
857 dbg_gen("dent '%.*s', target '%s' in dir ino %lu", dentry
->d_name
.len
,
858 dentry
->d_name
.name
, symname
, dir
->i_ino
);
860 if (len
> UBIFS_MAX_INO_DATA
)
861 return -ENAMETOOLONG
;
863 err
= ubifs_budget_space(c
, &req
);
867 inode
= ubifs_new_inode(c
, dir
, S_IFLNK
| S_IRWXUGO
);
869 err
= PTR_ERR(inode
);
873 ui
= ubifs_inode(inode
);
874 ui
->data
= kmalloc(len
+ 1, GFP_NOFS
);
880 memcpy(ui
->data
, symname
, len
);
881 ((char *)ui
->data
)[len
] = '\0';
883 * The terminating zero byte is not written to the flash media and it
884 * is put just to make later in-memory string processing simpler. Thus,
885 * data length is @len, not @len + %1.
888 inode
->i_size
= ubifs_inode(inode
)->ui_size
= len
;
890 mutex_lock(&dir_ui
->ui_mutex
);
891 dir
->i_size
+= sz_change
;
892 dir_ui
->ui_size
= dir
->i_size
;
893 dir
->i_mtime
= dir
->i_ctime
= inode
->i_ctime
;
894 err
= ubifs_jnl_update(c
, dir
, &dentry
->d_name
, inode
, 0, 0);
897 mutex_unlock(&dir_ui
->ui_mutex
);
899 ubifs_release_budget(c
, &req
);
900 insert_inode_hash(inode
);
901 d_instantiate(dentry
, inode
);
905 dir
->i_size
-= sz_change
;
906 dir_ui
->ui_size
= dir
->i_size
;
907 mutex_unlock(&dir_ui
->ui_mutex
);
909 make_bad_inode(inode
);
912 ubifs_release_budget(c
, &req
);
917 * lock_3_inodes - a wrapper for locking three UBIFS inodes.
918 * @inode1: first inode
919 * @inode2: second inode
920 * @inode3: third inode
922 * This function is used for 'ubifs_rename()' and @inode1 may be the same as
923 * @inode2 whereas @inode3 may be %NULL.
925 * We do not implement any tricks to guarantee strict lock ordering, because
926 * VFS has already done it for us on the @i_mutex. So this is just a simple
929 static void lock_3_inodes(struct inode
*inode1
, struct inode
*inode2
,
930 struct inode
*inode3
)
932 mutex_lock_nested(&ubifs_inode(inode1
)->ui_mutex
, WB_MUTEX_1
);
933 if (inode2
!= inode1
)
934 mutex_lock_nested(&ubifs_inode(inode2
)->ui_mutex
, WB_MUTEX_2
);
936 mutex_lock_nested(&ubifs_inode(inode3
)->ui_mutex
, WB_MUTEX_3
);
940 * unlock_3_inodes - a wrapper for unlocking three UBIFS inodes for rename.
941 * @inode1: first inode
942 * @inode2: second inode
943 * @inode3: third inode
945 static void unlock_3_inodes(struct inode
*inode1
, struct inode
*inode2
,
946 struct inode
*inode3
)
949 mutex_unlock(&ubifs_inode(inode3
)->ui_mutex
);
950 if (inode1
!= inode2
)
951 mutex_unlock(&ubifs_inode(inode2
)->ui_mutex
);
952 mutex_unlock(&ubifs_inode(inode1
)->ui_mutex
);
955 static int ubifs_rename(struct inode
*old_dir
, struct dentry
*old_dentry
,
956 struct inode
*new_dir
, struct dentry
*new_dentry
)
958 struct ubifs_info
*c
= old_dir
->i_sb
->s_fs_info
;
959 struct inode
*old_inode
= old_dentry
->d_inode
;
960 struct inode
*new_inode
= new_dentry
->d_inode
;
961 struct ubifs_inode
*old_inode_ui
= ubifs_inode(old_inode
);
962 int err
, release
, sync
= 0, move
= (new_dir
!= old_dir
);
963 int is_dir
= S_ISDIR(old_inode
->i_mode
);
964 int unlink
= !!new_inode
;
965 int new_sz
= CALC_DENT_SIZE(new_dentry
->d_name
.len
);
966 int old_sz
= CALC_DENT_SIZE(old_dentry
->d_name
.len
);
967 struct ubifs_budget_req req
= { .new_dent
= 1, .mod_dent
= 1,
969 struct ubifs_budget_req ino_req
= { .dirtied_ino
= 1,
970 .dirtied_ino_d
= ALIGN(old_inode_ui
->data_len
, 8) };
971 struct timespec time
;
972 unsigned int uninitialized_var(saved_nlink
);
975 * Budget request settings: deletion direntry, new direntry, removing
976 * the old inode, and changing old and new parent directory inodes.
978 * However, this operation also marks the target inode as dirty and
979 * does not write it, so we allocate budget for the target inode
983 dbg_gen("dent '%.*s' ino %lu in dir ino %lu to dent '%.*s' in dir ino %lu",
984 old_dentry
->d_name
.len
, old_dentry
->d_name
.name
,
985 old_inode
->i_ino
, old_dir
->i_ino
, new_dentry
->d_name
.len
,
986 new_dentry
->d_name
.name
, new_dir
->i_ino
);
987 ubifs_assert(mutex_is_locked(&old_dir
->i_mutex
));
988 ubifs_assert(mutex_is_locked(&new_dir
->i_mutex
));
990 ubifs_assert(mutex_is_locked(&new_inode
->i_mutex
));
993 if (unlink
&& is_dir
) {
994 err
= check_dir_empty(c
, new_inode
);
999 err
= ubifs_budget_space(c
, &req
);
1002 err
= ubifs_budget_space(c
, &ino_req
);
1004 ubifs_release_budget(c
, &req
);
1008 lock_3_inodes(old_dir
, new_dir
, new_inode
);
1011 * Like most other Unix systems, set the @i_ctime for inodes on a
1014 time
= ubifs_current_time(old_dir
);
1015 old_inode
->i_ctime
= time
;
1017 /* We must adjust parent link count when renaming directories */
1021 * @old_dir loses a link because we are moving
1022 * @old_inode to a different directory.
1024 drop_nlink(old_dir
);
1026 * @new_dir only gains a link if we are not also
1027 * overwriting an existing directory.
1033 * @old_inode is not moving to a different directory,
1034 * but @old_dir still loses a link if we are
1035 * overwriting an existing directory.
1038 drop_nlink(old_dir
);
1042 old_dir
->i_size
-= old_sz
;
1043 ubifs_inode(old_dir
)->ui_size
= old_dir
->i_size
;
1044 old_dir
->i_mtime
= old_dir
->i_ctime
= time
;
1045 new_dir
->i_mtime
= new_dir
->i_ctime
= time
;
1048 * And finally, if we unlinked a direntry which happened to have the
1049 * same name as the moved direntry, we have to decrement @i_nlink of
1050 * the unlinked inode and change its ctime.
1054 * Directories cannot have hard-links, so if this is a
1055 * directory, just clear @i_nlink.
1057 saved_nlink
= new_inode
->i_nlink
;
1059 clear_nlink(new_inode
);
1061 drop_nlink(new_inode
);
1062 new_inode
->i_ctime
= time
;
1064 new_dir
->i_size
+= new_sz
;
1065 ubifs_inode(new_dir
)->ui_size
= new_dir
->i_size
;
1069 * Do not ask 'ubifs_jnl_rename()' to flush write-buffer if @old_inode
1070 * is dirty, because this will be done later on at the end of
1073 if (IS_SYNC(old_inode
)) {
1074 sync
= IS_DIRSYNC(old_dir
) || IS_DIRSYNC(new_dir
);
1075 if (unlink
&& IS_SYNC(new_inode
))
1078 err
= ubifs_jnl_rename(c
, old_dir
, old_dentry
, new_dir
, new_dentry
,
1083 unlock_3_inodes(old_dir
, new_dir
, new_inode
);
1084 ubifs_release_budget(c
, &req
);
1086 mutex_lock(&old_inode_ui
->ui_mutex
);
1087 release
= old_inode_ui
->dirty
;
1088 mark_inode_dirty_sync(old_inode
);
1089 mutex_unlock(&old_inode_ui
->ui_mutex
);
1092 ubifs_release_budget(c
, &ino_req
);
1093 if (IS_SYNC(old_inode
))
1094 err
= old_inode
->i_sb
->s_op
->write_inode(old_inode
, NULL
);
1099 set_nlink(new_inode
, saved_nlink
);
1101 new_dir
->i_size
-= new_sz
;
1102 ubifs_inode(new_dir
)->ui_size
= new_dir
->i_size
;
1104 old_dir
->i_size
+= old_sz
;
1105 ubifs_inode(old_dir
)->ui_size
= old_dir
->i_size
;
1110 drop_nlink(new_dir
);
1116 unlock_3_inodes(old_dir
, new_dir
, new_inode
);
1117 ubifs_release_budget(c
, &ino_req
);
1118 ubifs_release_budget(c
, &req
);
1122 int ubifs_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
,
1126 struct inode
*inode
= dentry
->d_inode
;
1127 struct ubifs_inode
*ui
= ubifs_inode(inode
);
1129 mutex_lock(&ui
->ui_mutex
);
1130 generic_fillattr(inode
, stat
);
1131 stat
->blksize
= UBIFS_BLOCK_SIZE
;
1132 stat
->size
= ui
->ui_size
;
1135 * Unfortunately, the 'stat()' system call was designed for block
1136 * device based file systems, and it is not appropriate for UBIFS,
1137 * because UBIFS does not have notion of "block". For example, it is
1138 * difficult to tell how many block a directory takes - it actually
1139 * takes less than 300 bytes, but we have to round it to block size,
1140 * which introduces large mistake. This makes utilities like 'du' to
1141 * report completely senseless numbers. This is the reason why UBIFS
1142 * goes the same way as JFFS2 - it reports zero blocks for everything
1143 * but regular files, which makes more sense than reporting completely
1146 if (S_ISREG(inode
->i_mode
)) {
1147 size
= ui
->xattr_size
;
1149 size
= ALIGN(size
, UBIFS_BLOCK_SIZE
);
1151 * Note, user-space expects 512-byte blocks count irrespectively
1152 * of what was reported in @stat->size.
1154 stat
->blocks
= size
>> 9;
1157 mutex_unlock(&ui
->ui_mutex
);
1161 const struct inode_operations ubifs_dir_inode_operations
= {
1162 .lookup
= ubifs_lookup
,
1163 .create
= ubifs_create
,
1165 .symlink
= ubifs_symlink
,
1166 .unlink
= ubifs_unlink
,
1167 .mkdir
= ubifs_mkdir
,
1168 .rmdir
= ubifs_rmdir
,
1169 .mknod
= ubifs_mknod
,
1170 .rename
= ubifs_rename
,
1171 .setattr
= ubifs_setattr
,
1172 .getattr
= ubifs_getattr
,
1173 .setxattr
= ubifs_setxattr
,
1174 .getxattr
= ubifs_getxattr
,
1175 .listxattr
= ubifs_listxattr
,
1176 .removexattr
= ubifs_removexattr
,
1179 const struct file_operations ubifs_dir_operations
= {
1180 .llseek
= ubifs_dir_llseek
,
1181 .release
= ubifs_dir_release
,
1182 .read
= generic_read_dir
,
1183 .readdir
= ubifs_readdir
,
1184 .fsync
= ubifs_fsync
,
1185 .unlocked_ioctl
= ubifs_ioctl
,
1186 #ifdef CONFIG_COMPAT
1187 .compat_ioctl
= ubifs_compat_ioctl
,