blob: 98014bf1d8b42aac47c8a09669bf21a3fc008c6f [file] [log] [blame]
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001/* * This file is part of UBIFS.
2 *
3 * Copyright (C) 2006-2008 Nokia Corporation.
4 * Copyright (C) 2006, 2007 University of Szeged, Hungary
5 *
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.
9 *
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
13 * more details.
14 *
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
18 *
19 * Authors: Artem Bityutskiy (Битюцкий Артём)
20 * Adrian Hunter
21 * Zoltan Sogor
22 */
23
24/*
25 * This file implements directory operations.
26 *
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.
33 *
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.
41 */
42
43#include "ubifs.h"
44
45/**
46 * inherit_flags - inherit flags of the parent inode.
47 * @dir: parent inode
48 * @mode: new inode mode flags
49 *
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.
56 *
57 * This function returns the inherited flags.
58 */
59static int inherit_flags(const struct inode *dir, int mode)
60{
61 int flags;
62 const struct ubifs_inode *ui = ubifs_inode(dir);
63
64 if (!S_ISDIR(dir->i_mode))
65 /*
66 * The parent is not a directory, which means that an extended
67 * attribute inode is being created. No flags.
68 */
69 return 0;
70
71 flags = ui->flags & (UBIFS_COMPR_FL | UBIFS_SYNC_FL | UBIFS_DIRSYNC_FL);
72 if (!S_ISDIR(mode))
73 /* The "DIRSYNC" flag only applies to directories */
74 flags &= ~UBIFS_DIRSYNC_FL;
75 return flags;
76}
77
78/**
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
83 *
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
86 * case of failure.
87 */
88struct inode *ubifs_new_inode(struct ubifs_info *c, const struct inode *dir,
89 int mode)
90{
91 struct inode *inode;
92 struct ubifs_inode *ui;
93
94 inode = new_inode(c->vfs_sb);
95 ui = ubifs_inode(inode);
96 if (!inode)
97 return ERR_PTR(-ENOMEM);
98
99 /*
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.
104 */
Artem Bityutskiy12e776a2011-05-27 15:50:39 +0300105 inode->i_flags |= S_NOCMTIME;
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300106
Dmitry Monakhovabf5d082010-03-04 17:32:21 +0300107 inode_init_owner(inode, dir, mode);
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300108 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;
113
114 switch (mode & S_IFMT) {
115 case S_IFREG:
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;
119 break;
120 case S_IFDIR:
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;
124 break;
125 case S_IFLNK:
126 inode->i_op = &ubifs_symlink_inode_operations;
127 break;
128 case S_IFSOCK:
129 case S_IFIFO:
130 case S_IFBLK:
131 case S_IFCHR:
132 inode->i_op = &ubifs_file_inode_operations;
133 break;
134 default:
135 BUG();
136 }
137
138 ui->flags = inherit_flags(dir, mode);
139 ubifs_set_inode_flags(inode);
140 if (S_ISREG(mode))
141 ui->compr_type = c->default_compr;
142 else
143 ui->compr_type = UBIFS_COMPR_NONE;
144 ui->synced_i_size = 0;
145
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);
153 iput(inode);
154 return ERR_PTR(-EINVAL);
155 }
156 ubifs_warn("running out of inode numbers (current %lu, max %d)",
Artem Bityutskiye84461a2008-10-29 12:08:43 +0200157 (unsigned long)c->highest_inum, INUM_WATERMARK);
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300158 }
159
160 inode->i_ino = ++c->highest_inum;
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300161 /*
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.
167 */
168 ui->creat_sqnum = ++c->max_sqnum;
169 spin_unlock(&c->cnt_lock);
170 return inode;
171}
172
173#ifdef CONFIG_UBIFS_FS_DEBUG
174
Artem Bityutskiybb2615d2011-05-31 17:47:53 +0300175static int dbg_check_name(const struct ubifs_info *c,
176 const struct ubifs_dent_node *dent,
177 const struct qstr *nm)
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300178{
179 if (!(ubifs_chk_flags & UBIFS_CHK_GEN))
180 return 0;
181 if (le16_to_cpu(dent->nlen) != nm->len)
182 return -EINVAL;
183 if (memcmp(dent->name, nm->name, nm->len))
184 return -EINVAL;
185 return 0;
186}
187
188#else
189
Artem Bityutskiybb2615d2011-05-31 17:47:53 +0300190#define dbg_check_name(c, dent, nm) 0
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300191
192#endif
193
194static struct dentry *ubifs_lookup(struct inode *dir, struct dentry *dentry,
195 struct nameidata *nd)
196{
197 int err;
198 union ubifs_key key;
199 struct inode *inode = NULL;
200 struct ubifs_dent_node *dent;
201 struct ubifs_info *c = dir->i_sb->s_fs_info;
202
203 dbg_gen("'%.*s' in dir ino %lu",
204 dentry->d_name.len, dentry->d_name.name, dir->i_ino);
205
206 if (dentry->d_name.len > UBIFS_MAX_NLEN)
207 return ERR_PTR(-ENAMETOOLONG);
208
209 dent = kmalloc(UBIFS_MAX_DENT_NODE_SZ, GFP_NOFS);
210 if (!dent)
211 return ERR_PTR(-ENOMEM);
212
213 dent_key_init(c, &key, dir->i_ino, &dentry->d_name);
214
215 err = ubifs_tnc_lookup_nm(c, &key, dent, &dentry->d_name);
216 if (err) {
Artem Bityutskiy720b4992008-08-13 16:16:31 +0300217 if (err == -ENOENT) {
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300218 dbg_gen("not found");
219 goto done;
220 }
221 goto out;
222 }
223
Artem Bityutskiybb2615d2011-05-31 17:47:53 +0300224 if (dbg_check_name(c, dent, &dentry->d_name)) {
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300225 err = -EINVAL;
226 goto out;
227 }
228
229 inode = ubifs_iget(dir->i_sb, le64_to_cpu(dent->inum));
230 if (IS_ERR(inode)) {
231 /*
232 * This should not happen. Probably the file-system needs
233 * checking.
234 */
235 err = PTR_ERR(inode);
236 ubifs_err("dead directory entry '%.*s', error %d",
237 dentry->d_name.len, dentry->d_name.name, err);
238 ubifs_ro_mode(c, err);
239 goto out;
240 }
241
242done:
243 kfree(dent);
244 /*
245 * Note, d_splice_alias() would be required instead if we supported
246 * NFS.
247 */
248 d_add(dentry, inode);
249 return NULL;
250
251out:
252 kfree(dent);
253 return ERR_PTR(err);
254}
255
256static int ubifs_create(struct inode *dir, struct dentry *dentry, int mode,
257 struct nameidata *nd)
258{
259 struct inode *inode;
260 struct ubifs_info *c = dir->i_sb->s_fs_info;
261 int err, sz_change = CALC_DENT_SIZE(dentry->d_name.len);
262 struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1,
263 .dirtied_ino = 1 };
264 struct ubifs_inode *dir_ui = ubifs_inode(dir);
265
266 /*
267 * Budget request settings: new inode, new direntry, changing the
268 * parent directory inode.
269 */
270
271 dbg_gen("dent '%.*s', mode %#x in dir ino %lu",
272 dentry->d_name.len, dentry->d_name.name, mode, dir->i_ino);
273
274 err = ubifs_budget_space(c, &req);
275 if (err)
276 return err;
277
278 inode = ubifs_new_inode(c, dir, mode);
279 if (IS_ERR(inode)) {
280 err = PTR_ERR(inode);
281 goto out_budg;
282 }
283
284 mutex_lock(&dir_ui->ui_mutex);
285 dir->i_size += sz_change;
286 dir_ui->ui_size = dir->i_size;
287 dir->i_mtime = dir->i_ctime = inode->i_ctime;
288 err = ubifs_jnl_update(c, dir, &dentry->d_name, inode, 0, 0);
289 if (err)
290 goto out_cancel;
291 mutex_unlock(&dir_ui->ui_mutex);
292
293 ubifs_release_budget(c, &req);
294 insert_inode_hash(inode);
295 d_instantiate(dentry, inode);
296 return 0;
297
298out_cancel:
299 dir->i_size -= sz_change;
300 dir_ui->ui_size = dir->i_size;
301 mutex_unlock(&dir_ui->ui_mutex);
302 make_bad_inode(inode);
303 iput(inode);
304out_budg:
305 ubifs_release_budget(c, &req);
306 ubifs_err("cannot create regular file, error %d", err);
307 return err;
308}
309
310/**
311 * vfs_dent_type - get VFS directory entry type.
312 * @type: UBIFS directory entry type
313 *
314 * This function converts UBIFS directory entry type into VFS directory entry
315 * type.
316 */
317static unsigned int vfs_dent_type(uint8_t type)
318{
319 switch (type) {
320 case UBIFS_ITYPE_REG:
321 return DT_REG;
322 case UBIFS_ITYPE_DIR:
323 return DT_DIR;
324 case UBIFS_ITYPE_LNK:
325 return DT_LNK;
326 case UBIFS_ITYPE_BLK:
327 return DT_BLK;
328 case UBIFS_ITYPE_CHR:
329 return DT_CHR;
330 case UBIFS_ITYPE_FIFO:
331 return DT_FIFO;
332 case UBIFS_ITYPE_SOCK:
333 return DT_SOCK;
334 default:
335 BUG();
336 }
337 return 0;
338}
339
340/*
341 * The classical Unix view for directory is that it is a linear array of
342 * (name, inode number) entries. Linux/VFS assumes this model as well.
343 * Particularly, 'readdir()' call wants us to return a directory entry offset
344 * which later may be used to continue 'readdir()'ing the directory or to
345 * 'seek()' to that specific direntry. Obviously UBIFS does not really fit this
346 * model because directory entries are identified by keys, which may collide.
347 *
348 * UBIFS uses directory entry hash value for directory offsets, so
349 * 'seekdir()'/'telldir()' may not always work because of possible key
350 * collisions. But UBIFS guarantees that consecutive 'readdir()' calls work
351 * properly by means of saving full directory entry name in the private field
352 * of the file description object.
353 *
354 * This means that UBIFS cannot support NFS which requires full
355 * 'seekdir()'/'telldir()' support.
356 */
357static int ubifs_readdir(struct file *file, void *dirent, filldir_t filldir)
358{
359 int err, over = 0;
360 struct qstr nm;
361 union ubifs_key key;
362 struct ubifs_dent_node *dent;
363 struct inode *dir = file->f_path.dentry->d_inode;
364 struct ubifs_info *c = dir->i_sb->s_fs_info;
365
366 dbg_gen("dir ino %lu, f_pos %#llx", dir->i_ino, file->f_pos);
367
368 if (file->f_pos > UBIFS_S_KEY_HASH_MASK || file->f_pos == 2)
369 /*
370 * The directory was seek'ed to a senseless position or there
371 * are no more entries.
372 */
373 return 0;
374
375 /* File positions 0 and 1 correspond to "." and ".." */
376 if (file->f_pos == 0) {
377 ubifs_assert(!file->private_data);
378 over = filldir(dirent, ".", 1, 0, dir->i_ino, DT_DIR);
379 if (over)
380 return 0;
381 file->f_pos = 1;
382 }
383
384 if (file->f_pos == 1) {
385 ubifs_assert(!file->private_data);
386 over = filldir(dirent, "..", 2, 1,
387 parent_ino(file->f_path.dentry), DT_DIR);
388 if (over)
389 return 0;
390
391 /* Find the first entry in TNC and save it */
392 lowest_dent_key(c, &key, dir->i_ino);
393 nm.name = NULL;
394 dent = ubifs_tnc_next_ent(c, &key, &nm);
395 if (IS_ERR(dent)) {
396 err = PTR_ERR(dent);
397 goto out;
398 }
399
400 file->f_pos = key_hash_flash(c, &dent->key);
401 file->private_data = dent;
402 }
403
404 dent = file->private_data;
405 if (!dent) {
406 /*
407 * The directory was seek'ed to and is now readdir'ed.
408 * Find the entry corresponding to @file->f_pos or the
409 * closest one.
410 */
411 dent_key_init_hash(c, &key, dir->i_ino, file->f_pos);
412 nm.name = NULL;
413 dent = ubifs_tnc_next_ent(c, &key, &nm);
414 if (IS_ERR(dent)) {
415 err = PTR_ERR(dent);
416 goto out;
417 }
418 file->f_pos = key_hash_flash(c, &dent->key);
419 file->private_data = dent;
420 }
421
422 while (1) {
423 dbg_gen("feed '%s', ino %llu, new f_pos %#x",
Alexander Beregalov7424bac2008-09-17 22:09:41 +0400424 dent->name, (unsigned long long)le64_to_cpu(dent->inum),
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300425 key_hash_flash(c, &dent->key));
Harvey Harrison0ecb9522008-10-24 10:52:57 -0700426 ubifs_assert(le64_to_cpu(dent->ch.sqnum) >
427 ubifs_inode(dir)->creat_sqnum);
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300428
429 nm.len = le16_to_cpu(dent->nlen);
430 over = filldir(dirent, dent->name, nm.len, file->f_pos,
431 le64_to_cpu(dent->inum),
432 vfs_dent_type(dent->type));
433 if (over)
434 return 0;
435
436 /* Switch to the next entry */
437 key_read(c, &dent->key, &key);
438 nm.name = dent->name;
439 dent = ubifs_tnc_next_ent(c, &key, &nm);
440 if (IS_ERR(dent)) {
441 err = PTR_ERR(dent);
442 goto out;
443 }
444
445 kfree(file->private_data);
446 file->f_pos = key_hash_flash(c, &dent->key);
447 file->private_data = dent;
448 cond_resched();
449 }
450
451out:
452 if (err != -ENOENT) {
453 ubifs_err("cannot find next direntry, error %d", err);
454 return err;
455 }
456
457 kfree(file->private_data);
458 file->private_data = NULL;
459 file->f_pos = 2;
460 return 0;
461}
462
463/* If a directory is seeked, we have to free saved readdir() state */
464static loff_t ubifs_dir_llseek(struct file *file, loff_t offset, int origin)
465{
466 kfree(file->private_data);
467 file->private_data = NULL;
468 return generic_file_llseek(file, offset, origin);
469}
470
471/* Free saved readdir() state when the directory is closed */
472static int ubifs_dir_release(struct inode *dir, struct file *file)
473{
474 kfree(file->private_data);
475 file->private_data = NULL;
476 return 0;
477}
478
479/**
Artem Bityutskiy82c15932009-01-20 16:46:02 +0200480 * lock_2_inodes - a wrapper for locking two UBIFS inodes.
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300481 * @inode1: first inode
482 * @inode2: second inode
Artem Bityutskiy82c15932009-01-20 16:46:02 +0200483 *
484 * We do not implement any tricks to guarantee strict lock ordering, because
485 * VFS has already done it for us on the @i_mutex. So this is just a simple
486 * wrapper function.
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300487 */
488static void lock_2_inodes(struct inode *inode1, struct inode *inode2)
489{
Artem Bityutskiy82c15932009-01-20 16:46:02 +0200490 mutex_lock_nested(&ubifs_inode(inode1)->ui_mutex, WB_MUTEX_1);
491 mutex_lock_nested(&ubifs_inode(inode2)->ui_mutex, WB_MUTEX_2);
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300492}
493
494/**
Artem Bityutskiy82c15932009-01-20 16:46:02 +0200495 * unlock_2_inodes - a wrapper for unlocking two UBIFS inodes.
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300496 * @inode1: first inode
497 * @inode2: second inode
498 */
499static void unlock_2_inodes(struct inode *inode1, struct inode *inode2)
500{
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300501 mutex_unlock(&ubifs_inode(inode2)->ui_mutex);
Artem Bityutskiy82c15932009-01-20 16:46:02 +0200502 mutex_unlock(&ubifs_inode(inode1)->ui_mutex);
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300503}
504
505static int ubifs_link(struct dentry *old_dentry, struct inode *dir,
506 struct dentry *dentry)
507{
508 struct ubifs_info *c = dir->i_sb->s_fs_info;
509 struct inode *inode = old_dentry->d_inode;
510 struct ubifs_inode *ui = ubifs_inode(inode);
511 struct ubifs_inode *dir_ui = ubifs_inode(dir);
512 int err, sz_change = CALC_DENT_SIZE(dentry->d_name.len);
513 struct ubifs_budget_req req = { .new_dent = 1, .dirtied_ino = 2,
Artem Bityutskiydab4b4d2008-07-24 14:52:45 +0300514 .dirtied_ino_d = ALIGN(ui->data_len, 8) };
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300515
516 /*
517 * Budget request settings: new direntry, changing the target inode,
518 * changing the parent inode.
519 */
520
521 dbg_gen("dent '%.*s' to ino %lu (nlink %d) in dir ino %lu",
522 dentry->d_name.len, dentry->d_name.name, inode->i_ino,
523 inode->i_nlink, dir->i_ino);
Artem Bityutskiy82c15932009-01-20 16:46:02 +0200524 ubifs_assert(mutex_is_locked(&dir->i_mutex));
525 ubifs_assert(mutex_is_locked(&inode->i_mutex));
Hunter Adrian8b3884a2009-05-14 06:32:30 +0200526
Artem Bityutskiyd808efb2011-05-31 18:14:38 +0300527 err = dbg_check_synced_i_size(c, inode);
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300528 if (err)
529 return err;
530
531 err = ubifs_budget_space(c, &req);
532 if (err)
533 return err;
534
535 lock_2_inodes(dir, inode);
536 inc_nlink(inode);
Al Viro7de9c6ee2010-10-23 11:11:40 -0400537 ihold(inode);
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300538 inode->i_ctime = ubifs_current_time(inode);
539 dir->i_size += sz_change;
540 dir_ui->ui_size = dir->i_size;
541 dir->i_mtime = dir->i_ctime = inode->i_ctime;
542 err = ubifs_jnl_update(c, dir, &dentry->d_name, inode, 0, 0);
543 if (err)
544 goto out_cancel;
545 unlock_2_inodes(dir, inode);
546
547 ubifs_release_budget(c, &req);
548 d_instantiate(dentry, inode);
549 return 0;
550
551out_cancel:
552 dir->i_size -= sz_change;
553 dir_ui->ui_size = dir->i_size;
554 drop_nlink(inode);
555 unlock_2_inodes(dir, inode);
556 ubifs_release_budget(c, &req);
557 iput(inode);
558 return err;
559}
560
561static int ubifs_unlink(struct inode *dir, struct dentry *dentry)
562{
563 struct ubifs_info *c = dir->i_sb->s_fs_info;
564 struct inode *inode = dentry->d_inode;
565 struct ubifs_inode *dir_ui = ubifs_inode(dir);
566 int sz_change = CALC_DENT_SIZE(dentry->d_name.len);
567 int err, budgeted = 1;
568 struct ubifs_budget_req req = { .mod_dent = 1, .dirtied_ino = 2 };
569
570 /*
571 * Budget request settings: deletion direntry, deletion inode (+1 for
572 * @dirtied_ino), changing the parent directory inode. If budgeting
573 * fails, go ahead anyway because we have extra space reserved for
574 * deletions.
575 */
576
577 dbg_gen("dent '%.*s' from ino %lu (nlink %d) in dir ino %lu",
578 dentry->d_name.len, dentry->d_name.name, inode->i_ino,
579 inode->i_nlink, dir->i_ino);
Artem Bityutskiy82c15932009-01-20 16:46:02 +0200580 ubifs_assert(mutex_is_locked(&dir->i_mutex));
581 ubifs_assert(mutex_is_locked(&inode->i_mutex));
Artem Bityutskiyd808efb2011-05-31 18:14:38 +0300582 err = dbg_check_synced_i_size(c, inode);
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300583 if (err)
584 return err;
585
586 err = ubifs_budget_space(c, &req);
587 if (err) {
588 if (err != -ENOSPC)
589 return err;
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300590 budgeted = 0;
591 }
592
593 lock_2_inodes(dir, inode);
594 inode->i_ctime = ubifs_current_time(dir);
595 drop_nlink(inode);
596 dir->i_size -= sz_change;
597 dir_ui->ui_size = dir->i_size;
598 dir->i_mtime = dir->i_ctime = inode->i_ctime;
599 err = ubifs_jnl_update(c, dir, &dentry->d_name, inode, 1, 0);
600 if (err)
601 goto out_cancel;
602 unlock_2_inodes(dir, inode);
603
604 if (budgeted)
605 ubifs_release_budget(c, &req);
606 else {
607 /* We've deleted something - clean the "no space" flags */
Artem Bityutskiyb1375452011-03-29 18:04:05 +0300608 c->bi.nospace = c->bi.nospace_rp = 0;
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300609 smp_wmb();
610 }
611 return 0;
612
613out_cancel:
614 dir->i_size += sz_change;
615 dir_ui->ui_size = dir->i_size;
616 inc_nlink(inode);
617 unlock_2_inodes(dir, inode);
618 if (budgeted)
619 ubifs_release_budget(c, &req);
620 return err;
621}
622
623/**
624 * check_dir_empty - check if a directory is empty or not.
625 * @c: UBIFS file-system description object
626 * @dir: VFS inode object of the directory to check
627 *
628 * This function checks if directory @dir is empty. Returns zero if the
629 * directory is empty, %-ENOTEMPTY if it is not, and other negative error codes
630 * in case of of errors.
631 */
632static int check_dir_empty(struct ubifs_info *c, struct inode *dir)
633{
634 struct qstr nm = { .name = NULL };
635 struct ubifs_dent_node *dent;
636 union ubifs_key key;
637 int err;
638
639 lowest_dent_key(c, &key, dir->i_ino);
640 dent = ubifs_tnc_next_ent(c, &key, &nm);
641 if (IS_ERR(dent)) {
642 err = PTR_ERR(dent);
643 if (err == -ENOENT)
644 err = 0;
645 } else {
646 kfree(dent);
647 err = -ENOTEMPTY;
648 }
649 return err;
650}
651
652static int ubifs_rmdir(struct inode *dir, struct dentry *dentry)
653{
654 struct ubifs_info *c = dir->i_sb->s_fs_info;
655 struct inode *inode = dentry->d_inode;
656 int sz_change = CALC_DENT_SIZE(dentry->d_name.len);
657 int err, budgeted = 1;
658 struct ubifs_inode *dir_ui = ubifs_inode(dir);
659 struct ubifs_budget_req req = { .mod_dent = 1, .dirtied_ino = 2 };
660
661 /*
662 * Budget request settings: deletion direntry, deletion inode and
663 * changing the parent inode. If budgeting fails, go ahead anyway
664 * because we have extra space reserved for deletions.
665 */
666
667 dbg_gen("directory '%.*s', ino %lu in dir ino %lu", dentry->d_name.len,
668 dentry->d_name.name, inode->i_ino, dir->i_ino);
Artem Bityutskiy82c15932009-01-20 16:46:02 +0200669 ubifs_assert(mutex_is_locked(&dir->i_mutex));
670 ubifs_assert(mutex_is_locked(&inode->i_mutex));
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300671 err = check_dir_empty(c, dentry->d_inode);
672 if (err)
673 return err;
674
675 err = ubifs_budget_space(c, &req);
676 if (err) {
677 if (err != -ENOSPC)
678 return err;
679 budgeted = 0;
680 }
681
682 lock_2_inodes(dir, inode);
683 inode->i_ctime = ubifs_current_time(dir);
684 clear_nlink(inode);
685 drop_nlink(dir);
686 dir->i_size -= sz_change;
687 dir_ui->ui_size = dir->i_size;
688 dir->i_mtime = dir->i_ctime = inode->i_ctime;
689 err = ubifs_jnl_update(c, dir, &dentry->d_name, inode, 1, 0);
690 if (err)
691 goto out_cancel;
692 unlock_2_inodes(dir, inode);
693
694 if (budgeted)
695 ubifs_release_budget(c, &req);
696 else {
697 /* We've deleted something - clean the "no space" flags */
Artem Bityutskiyb1375452011-03-29 18:04:05 +0300698 c->bi.nospace = c->bi.nospace_rp = 0;
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300699 smp_wmb();
700 }
701 return 0;
702
703out_cancel:
704 dir->i_size += sz_change;
705 dir_ui->ui_size = dir->i_size;
706 inc_nlink(dir);
707 inc_nlink(inode);
708 inc_nlink(inode);
709 unlock_2_inodes(dir, inode);
710 if (budgeted)
711 ubifs_release_budget(c, &req);
712 return err;
713}
714
715static int ubifs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
716{
717 struct inode *inode;
718 struct ubifs_inode *dir_ui = ubifs_inode(dir);
719 struct ubifs_info *c = dir->i_sb->s_fs_info;
720 int err, sz_change = CALC_DENT_SIZE(dentry->d_name.len);
Artem Bityutskiy182854b2008-07-18 18:54:29 +0300721 struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1 };
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300722
723 /*
724 * Budget request settings: new inode, new direntry and changing parent
725 * directory inode.
726 */
727
728 dbg_gen("dent '%.*s', mode %#x in dir ino %lu",
729 dentry->d_name.len, dentry->d_name.name, mode, dir->i_ino);
730
731 err = ubifs_budget_space(c, &req);
732 if (err)
733 return err;
734
735 inode = ubifs_new_inode(c, dir, S_IFDIR | mode);
736 if (IS_ERR(inode)) {
737 err = PTR_ERR(inode);
738 goto out_budg;
739 }
740
741 mutex_lock(&dir_ui->ui_mutex);
742 insert_inode_hash(inode);
743 inc_nlink(inode);
744 inc_nlink(dir);
745 dir->i_size += sz_change;
746 dir_ui->ui_size = dir->i_size;
747 dir->i_mtime = dir->i_ctime = inode->i_ctime;
748 err = ubifs_jnl_update(c, dir, &dentry->d_name, inode, 0, 0);
749 if (err) {
750 ubifs_err("cannot create directory, error %d", err);
751 goto out_cancel;
752 }
753 mutex_unlock(&dir_ui->ui_mutex);
754
755 ubifs_release_budget(c, &req);
756 d_instantiate(dentry, inode);
757 return 0;
758
759out_cancel:
760 dir->i_size -= sz_change;
761 dir_ui->ui_size = dir->i_size;
762 drop_nlink(dir);
763 mutex_unlock(&dir_ui->ui_mutex);
764 make_bad_inode(inode);
765 iput(inode);
766out_budg:
767 ubifs_release_budget(c, &req);
768 return err;
769}
770
771static int ubifs_mknod(struct inode *dir, struct dentry *dentry,
772 int mode, dev_t rdev)
773{
774 struct inode *inode;
775 struct ubifs_inode *ui;
776 struct ubifs_inode *dir_ui = ubifs_inode(dir);
777 struct ubifs_info *c = dir->i_sb->s_fs_info;
778 union ubifs_dev_desc *dev = NULL;
779 int sz_change = CALC_DENT_SIZE(dentry->d_name.len);
780 int err, devlen = 0;
781 struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1,
Artem Bityutskiydab4b4d2008-07-24 14:52:45 +0300782 .new_ino_d = ALIGN(devlen, 8),
783 .dirtied_ino = 1 };
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300784
785 /*
786 * Budget request settings: new inode, new direntry and changing parent
787 * directory inode.
788 */
789
790 dbg_gen("dent '%.*s' in dir ino %lu",
791 dentry->d_name.len, dentry->d_name.name, dir->i_ino);
792
793 if (!new_valid_dev(rdev))
794 return -EINVAL;
795
796 if (S_ISBLK(mode) || S_ISCHR(mode)) {
797 dev = kmalloc(sizeof(union ubifs_dev_desc), GFP_NOFS);
798 if (!dev)
799 return -ENOMEM;
800 devlen = ubifs_encode_dev(dev, rdev);
801 }
802
803 err = ubifs_budget_space(c, &req);
804 if (err) {
805 kfree(dev);
806 return err;
807 }
808
809 inode = ubifs_new_inode(c, dir, mode);
810 if (IS_ERR(inode)) {
811 kfree(dev);
812 err = PTR_ERR(inode);
813 goto out_budg;
814 }
815
816 init_special_inode(inode, inode->i_mode, rdev);
817 inode->i_size = ubifs_inode(inode)->ui_size = devlen;
818 ui = ubifs_inode(inode);
819 ui->data = dev;
820 ui->data_len = devlen;
821
822 mutex_lock(&dir_ui->ui_mutex);
823 dir->i_size += sz_change;
824 dir_ui->ui_size = dir->i_size;
825 dir->i_mtime = dir->i_ctime = inode->i_ctime;
826 err = ubifs_jnl_update(c, dir, &dentry->d_name, inode, 0, 0);
827 if (err)
828 goto out_cancel;
829 mutex_unlock(&dir_ui->ui_mutex);
830
831 ubifs_release_budget(c, &req);
832 insert_inode_hash(inode);
833 d_instantiate(dentry, inode);
834 return 0;
835
836out_cancel:
837 dir->i_size -= sz_change;
838 dir_ui->ui_size = dir->i_size;
839 mutex_unlock(&dir_ui->ui_mutex);
840 make_bad_inode(inode);
841 iput(inode);
842out_budg:
843 ubifs_release_budget(c, &req);
844 return err;
845}
846
847static int ubifs_symlink(struct inode *dir, struct dentry *dentry,
848 const char *symname)
849{
850 struct inode *inode;
851 struct ubifs_inode *ui;
852 struct ubifs_inode *dir_ui = ubifs_inode(dir);
853 struct ubifs_info *c = dir->i_sb->s_fs_info;
854 int err, len = strlen(symname);
855 int sz_change = CALC_DENT_SIZE(dentry->d_name.len);
856 struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1,
Artem Bityutskiydab4b4d2008-07-24 14:52:45 +0300857 .new_ino_d = ALIGN(len, 8),
858 .dirtied_ino = 1 };
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300859
860 /*
861 * Budget request settings: new inode, new direntry and changing parent
862 * directory inode.
863 */
864
865 dbg_gen("dent '%.*s', target '%s' in dir ino %lu", dentry->d_name.len,
866 dentry->d_name.name, symname, dir->i_ino);
867
868 if (len > UBIFS_MAX_INO_DATA)
869 return -ENAMETOOLONG;
870
871 err = ubifs_budget_space(c, &req);
872 if (err)
873 return err;
874
875 inode = ubifs_new_inode(c, dir, S_IFLNK | S_IRWXUGO);
876 if (IS_ERR(inode)) {
877 err = PTR_ERR(inode);
878 goto out_budg;
879 }
880
881 ui = ubifs_inode(inode);
882 ui->data = kmalloc(len + 1, GFP_NOFS);
883 if (!ui->data) {
884 err = -ENOMEM;
885 goto out_inode;
886 }
887
888 memcpy(ui->data, symname, len);
889 ((char *)ui->data)[len] = '\0';
890 /*
891 * The terminating zero byte is not written to the flash media and it
892 * is put just to make later in-memory string processing simpler. Thus,
893 * data length is @len, not @len + %1.
894 */
895 ui->data_len = len;
896 inode->i_size = ubifs_inode(inode)->ui_size = len;
897
898 mutex_lock(&dir_ui->ui_mutex);
899 dir->i_size += sz_change;
900 dir_ui->ui_size = dir->i_size;
901 dir->i_mtime = dir->i_ctime = inode->i_ctime;
902 err = ubifs_jnl_update(c, dir, &dentry->d_name, inode, 0, 0);
903 if (err)
904 goto out_cancel;
905 mutex_unlock(&dir_ui->ui_mutex);
906
907 ubifs_release_budget(c, &req);
908 insert_inode_hash(inode);
909 d_instantiate(dentry, inode);
910 return 0;
911
912out_cancel:
913 dir->i_size -= sz_change;
914 dir_ui->ui_size = dir->i_size;
915 mutex_unlock(&dir_ui->ui_mutex);
916out_inode:
917 make_bad_inode(inode);
918 iput(inode);
919out_budg:
920 ubifs_release_budget(c, &req);
921 return err;
922}
923
924/**
Artem Bityutskiy82c15932009-01-20 16:46:02 +0200925 * lock_3_inodes - a wrapper for locking three UBIFS inodes.
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300926 * @inode1: first inode
927 * @inode2: second inode
928 * @inode3: third inode
929 *
Artem Bityutskiy82c15932009-01-20 16:46:02 +0200930 * This function is used for 'ubifs_rename()' and @inode1 may be the same as
931 * @inode2 whereas @inode3 may be %NULL.
932 *
933 * We do not implement any tricks to guarantee strict lock ordering, because
934 * VFS has already done it for us on the @i_mutex. So this is just a simple
935 * wrapper function.
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300936 */
937static void lock_3_inodes(struct inode *inode1, struct inode *inode2,
938 struct inode *inode3)
939{
Artem Bityutskiy82c15932009-01-20 16:46:02 +0200940 mutex_lock_nested(&ubifs_inode(inode1)->ui_mutex, WB_MUTEX_1);
941 if (inode2 != inode1)
942 mutex_lock_nested(&ubifs_inode(inode2)->ui_mutex, WB_MUTEX_2);
943 if (inode3)
944 mutex_lock_nested(&ubifs_inode(inode3)->ui_mutex, WB_MUTEX_3);
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300945}
946
947/**
Artem Bityutskiy82c15932009-01-20 16:46:02 +0200948 * unlock_3_inodes - a wrapper for unlocking three UBIFS inodes for rename.
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300949 * @inode1: first inode
950 * @inode2: second inode
951 * @inode3: third inode
952 */
953static void unlock_3_inodes(struct inode *inode1, struct inode *inode2,
954 struct inode *inode3)
955{
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300956 if (inode3)
957 mutex_unlock(&ubifs_inode(inode3)->ui_mutex);
Artem Bityutskiy82c15932009-01-20 16:46:02 +0200958 if (inode1 != inode2)
959 mutex_unlock(&ubifs_inode(inode2)->ui_mutex);
960 mutex_unlock(&ubifs_inode(inode1)->ui_mutex);
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300961}
962
963static int ubifs_rename(struct inode *old_dir, struct dentry *old_dentry,
964 struct inode *new_dir, struct dentry *new_dentry)
965{
966 struct ubifs_info *c = old_dir->i_sb->s_fs_info;
967 struct inode *old_inode = old_dentry->d_inode;
968 struct inode *new_inode = new_dentry->d_inode;
969 struct ubifs_inode *old_inode_ui = ubifs_inode(old_inode);
970 int err, release, sync = 0, move = (new_dir != old_dir);
971 int is_dir = S_ISDIR(old_inode->i_mode);
972 int unlink = !!new_inode;
973 int new_sz = CALC_DENT_SIZE(new_dentry->d_name.len);
974 int old_sz = CALC_DENT_SIZE(old_dentry->d_name.len);
975 struct ubifs_budget_req req = { .new_dent = 1, .mod_dent = 1,
976 .dirtied_ino = 3 };
977 struct ubifs_budget_req ino_req = { .dirtied_ino = 1,
Artem Bityutskiydab4b4d2008-07-24 14:52:45 +0300978 .dirtied_ino_d = ALIGN(old_inode_ui->data_len, 8) };
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300979 struct timespec time;
980
981 /*
982 * Budget request settings: deletion direntry, new direntry, removing
983 * the old inode, and changing old and new parent directory inodes.
984 *
985 * However, this operation also marks the target inode as dirty and
986 * does not write it, so we allocate budget for the target inode
987 * separately.
988 */
989
990 dbg_gen("dent '%.*s' ino %lu in dir ino %lu to dent '%.*s' in "
991 "dir ino %lu", old_dentry->d_name.len, old_dentry->d_name.name,
992 old_inode->i_ino, old_dir->i_ino, new_dentry->d_name.len,
993 new_dentry->d_name.name, new_dir->i_ino);
Artem Bityutskiy82c15932009-01-20 16:46:02 +0200994 ubifs_assert(mutex_is_locked(&old_dir->i_mutex));
995 ubifs_assert(mutex_is_locked(&new_dir->i_mutex));
996 if (unlink)
997 ubifs_assert(mutex_is_locked(&new_inode->i_mutex));
998
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300999
1000 if (unlink && is_dir) {
1001 err = check_dir_empty(c, new_inode);
1002 if (err)
1003 return err;
1004 }
1005
1006 err = ubifs_budget_space(c, &req);
1007 if (err)
1008 return err;
1009 err = ubifs_budget_space(c, &ino_req);
1010 if (err) {
1011 ubifs_release_budget(c, &req);
1012 return err;
1013 }
1014
1015 lock_3_inodes(old_dir, new_dir, new_inode);
1016
1017 /*
1018 * Like most other Unix systems, set the @i_ctime for inodes on a
1019 * rename.
1020 */
1021 time = ubifs_current_time(old_dir);
1022 old_inode->i_ctime = time;
1023
1024 /* We must adjust parent link count when renaming directories */
1025 if (is_dir) {
1026 if (move) {
1027 /*
1028 * @old_dir loses a link because we are moving
1029 * @old_inode to a different directory.
1030 */
1031 drop_nlink(old_dir);
1032 /*
1033 * @new_dir only gains a link if we are not also
1034 * overwriting an existing directory.
1035 */
1036 if (!unlink)
1037 inc_nlink(new_dir);
1038 } else {
1039 /*
1040 * @old_inode is not moving to a different directory,
1041 * but @old_dir still loses a link if we are
1042 * overwriting an existing directory.
1043 */
1044 if (unlink)
1045 drop_nlink(old_dir);
1046 }
1047 }
1048
1049 old_dir->i_size -= old_sz;
1050 ubifs_inode(old_dir)->ui_size = old_dir->i_size;
1051 old_dir->i_mtime = old_dir->i_ctime = time;
1052 new_dir->i_mtime = new_dir->i_ctime = time;
1053
1054 /*
1055 * And finally, if we unlinked a direntry which happened to have the
1056 * same name as the moved direntry, we have to decrement @i_nlink of
1057 * the unlinked inode and change its ctime.
1058 */
1059 if (unlink) {
1060 /*
1061 * Directories cannot have hard-links, so if this is a
1062 * directory, decrement its @i_nlink twice because an empty
1063 * directory has @i_nlink 2.
1064 */
1065 if (is_dir)
1066 drop_nlink(new_inode);
1067 new_inode->i_ctime = time;
1068 drop_nlink(new_inode);
1069 } else {
1070 new_dir->i_size += new_sz;
1071 ubifs_inode(new_dir)->ui_size = new_dir->i_size;
1072 }
1073
1074 /*
1075 * Do not ask 'ubifs_jnl_rename()' to flush write-buffer if @old_inode
1076 * is dirty, because this will be done later on at the end of
1077 * 'ubifs_rename()'.
1078 */
1079 if (IS_SYNC(old_inode)) {
1080 sync = IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir);
1081 if (unlink && IS_SYNC(new_inode))
1082 sync = 1;
1083 }
1084 err = ubifs_jnl_rename(c, old_dir, old_dentry, new_dir, new_dentry,
1085 sync);
1086 if (err)
1087 goto out_cancel;
1088
1089 unlock_3_inodes(old_dir, new_dir, new_inode);
1090 ubifs_release_budget(c, &req);
1091
1092 mutex_lock(&old_inode_ui->ui_mutex);
1093 release = old_inode_ui->dirty;
1094 mark_inode_dirty_sync(old_inode);
1095 mutex_unlock(&old_inode_ui->ui_mutex);
1096
1097 if (release)
1098 ubifs_release_budget(c, &ino_req);
1099 if (IS_SYNC(old_inode))
Christoph Hellwiga9185b42010-03-05 09:21:37 +01001100 err = old_inode->i_sb->s_op->write_inode(old_inode, NULL);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001101 return err;
1102
1103out_cancel:
1104 if (unlink) {
1105 if (is_dir)
1106 inc_nlink(new_inode);
1107 inc_nlink(new_inode);
1108 } else {
1109 new_dir->i_size -= new_sz;
1110 ubifs_inode(new_dir)->ui_size = new_dir->i_size;
1111 }
1112 old_dir->i_size += old_sz;
1113 ubifs_inode(old_dir)->ui_size = old_dir->i_size;
1114 if (is_dir) {
1115 if (move) {
1116 inc_nlink(old_dir);
1117 if (!unlink)
1118 drop_nlink(new_dir);
1119 } else {
1120 if (unlink)
1121 inc_nlink(old_dir);
1122 }
1123 }
1124 unlock_3_inodes(old_dir, new_dir, new_inode);
1125 ubifs_release_budget(c, &ino_req);
1126 ubifs_release_budget(c, &req);
1127 return err;
1128}
1129
1130int ubifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1131 struct kstat *stat)
1132{
1133 loff_t size;
1134 struct inode *inode = dentry->d_inode;
1135 struct ubifs_inode *ui = ubifs_inode(inode);
1136
1137 mutex_lock(&ui->ui_mutex);
1138 stat->dev = inode->i_sb->s_dev;
1139 stat->ino = inode->i_ino;
1140 stat->mode = inode->i_mode;
1141 stat->nlink = inode->i_nlink;
1142 stat->uid = inode->i_uid;
1143 stat->gid = inode->i_gid;
1144 stat->rdev = inode->i_rdev;
1145 stat->atime = inode->i_atime;
1146 stat->mtime = inode->i_mtime;
1147 stat->ctime = inode->i_ctime;
1148 stat->blksize = UBIFS_BLOCK_SIZE;
1149 stat->size = ui->ui_size;
1150
1151 /*
1152 * Unfortunately, the 'stat()' system call was designed for block
1153 * device based file systems, and it is not appropriate for UBIFS,
1154 * because UBIFS does not have notion of "block". For example, it is
1155 * difficult to tell how many block a directory takes - it actually
1156 * takes less than 300 bytes, but we have to round it to block size,
1157 * which introduces large mistake. This makes utilities like 'du' to
1158 * report completely senseless numbers. This is the reason why UBIFS
1159 * goes the same way as JFFS2 - it reports zero blocks for everything
1160 * but regular files, which makes more sense than reporting completely
1161 * wrong sizes.
1162 */
1163 if (S_ISREG(inode->i_mode)) {
1164 size = ui->xattr_size;
1165 size += stat->size;
1166 size = ALIGN(size, UBIFS_BLOCK_SIZE);
1167 /*
1168 * Note, user-space expects 512-byte blocks count irrespectively
1169 * of what was reported in @stat->size.
1170 */
1171 stat->blocks = size >> 9;
1172 } else
1173 stat->blocks = 0;
1174 mutex_unlock(&ui->ui_mutex);
1175 return 0;
1176}
1177
Artem Bityutskiye8b81562009-01-15 17:43:23 +02001178const struct inode_operations ubifs_dir_inode_operations = {
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001179 .lookup = ubifs_lookup,
1180 .create = ubifs_create,
1181 .link = ubifs_link,
1182 .symlink = ubifs_symlink,
1183 .unlink = ubifs_unlink,
1184 .mkdir = ubifs_mkdir,
1185 .rmdir = ubifs_rmdir,
1186 .mknod = ubifs_mknod,
1187 .rename = ubifs_rename,
1188 .setattr = ubifs_setattr,
1189 .getattr = ubifs_getattr,
1190#ifdef CONFIG_UBIFS_FS_XATTR
1191 .setxattr = ubifs_setxattr,
1192 .getxattr = ubifs_getxattr,
1193 .listxattr = ubifs_listxattr,
1194 .removexattr = ubifs_removexattr,
1195#endif
1196};
1197
Artem Bityutskiye8b81562009-01-15 17:43:23 +02001198const struct file_operations ubifs_dir_operations = {
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001199 .llseek = ubifs_dir_llseek,
1200 .release = ubifs_dir_release,
1201 .read = generic_read_dir,
1202 .readdir = ubifs_readdir,
1203 .fsync = ubifs_fsync,
1204 .unlocked_ioctl = ubifs_ioctl,
1205#ifdef CONFIG_COMPAT
1206 .compat_ioctl = ubifs_compat_ioctl,
1207#endif
1208};