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1e51764a AB |
1 | /* * 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 | */ | |
59 | static 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 | */ | |
88 | struct 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 | */ | |
105 | inode->i_flags |= (S_NOCMTIME); | |
106 | ||
abf5d08a | 107 | inode_init_owner(inode, dir, mode); |
1e51764a AB |
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; | |
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)", | |
e84461ad | 157 | (unsigned long)c->highest_inum, INUM_WATERMARK); |
1e51764a AB |
158 | } |
159 | ||
160 | inode->i_ino = ++c->highest_inum; | |
1e51764a AB |
161 | /* |
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 | ||
175 | static int dbg_check_name(struct ubifs_dent_node *dent, struct qstr *nm) | |
176 | { | |
177 | if (!(ubifs_chk_flags & UBIFS_CHK_GEN)) | |
178 | return 0; | |
179 | if (le16_to_cpu(dent->nlen) != nm->len) | |
180 | return -EINVAL; | |
181 | if (memcmp(dent->name, nm->name, nm->len)) | |
182 | return -EINVAL; | |
183 | return 0; | |
184 | } | |
185 | ||
186 | #else | |
187 | ||
188 | #define dbg_check_name(dent, nm) 0 | |
189 | ||
190 | #endif | |
191 | ||
192 | static struct dentry *ubifs_lookup(struct inode *dir, struct dentry *dentry, | |
193 | struct nameidata *nd) | |
194 | { | |
195 | int err; | |
196 | union ubifs_key key; | |
197 | struct inode *inode = NULL; | |
198 | struct ubifs_dent_node *dent; | |
199 | struct ubifs_info *c = dir->i_sb->s_fs_info; | |
200 | ||
201 | dbg_gen("'%.*s' in dir ino %lu", | |
202 | dentry->d_name.len, dentry->d_name.name, dir->i_ino); | |
203 | ||
204 | if (dentry->d_name.len > UBIFS_MAX_NLEN) | |
205 | return ERR_PTR(-ENAMETOOLONG); | |
206 | ||
207 | dent = kmalloc(UBIFS_MAX_DENT_NODE_SZ, GFP_NOFS); | |
208 | if (!dent) | |
209 | return ERR_PTR(-ENOMEM); | |
210 | ||
211 | dent_key_init(c, &key, dir->i_ino, &dentry->d_name); | |
212 | ||
213 | err = ubifs_tnc_lookup_nm(c, &key, dent, &dentry->d_name); | |
214 | if (err) { | |
720b499c | 215 | if (err == -ENOENT) { |
1e51764a AB |
216 | dbg_gen("not found"); |
217 | goto done; | |
218 | } | |
219 | goto out; | |
220 | } | |
221 | ||
222 | if (dbg_check_name(dent, &dentry->d_name)) { | |
223 | err = -EINVAL; | |
224 | goto out; | |
225 | } | |
226 | ||
227 | inode = ubifs_iget(dir->i_sb, le64_to_cpu(dent->inum)); | |
228 | if (IS_ERR(inode)) { | |
229 | /* | |
230 | * This should not happen. Probably the file-system needs | |
231 | * checking. | |
232 | */ | |
233 | err = PTR_ERR(inode); | |
234 | ubifs_err("dead directory entry '%.*s', error %d", | |
235 | dentry->d_name.len, dentry->d_name.name, err); | |
236 | ubifs_ro_mode(c, err); | |
237 | goto out; | |
238 | } | |
239 | ||
240 | done: | |
241 | kfree(dent); | |
242 | /* | |
243 | * Note, d_splice_alias() would be required instead if we supported | |
244 | * NFS. | |
245 | */ | |
246 | d_add(dentry, inode); | |
247 | return NULL; | |
248 | ||
249 | out: | |
250 | kfree(dent); | |
251 | return ERR_PTR(err); | |
252 | } | |
253 | ||
254 | static int ubifs_create(struct inode *dir, struct dentry *dentry, int mode, | |
255 | struct nameidata *nd) | |
256 | { | |
257 | struct inode *inode; | |
258 | struct ubifs_info *c = dir->i_sb->s_fs_info; | |
259 | int err, sz_change = CALC_DENT_SIZE(dentry->d_name.len); | |
260 | struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1, | |
261 | .dirtied_ino = 1 }; | |
262 | struct ubifs_inode *dir_ui = ubifs_inode(dir); | |
263 | ||
264 | /* | |
265 | * Budget request settings: new inode, new direntry, changing the | |
266 | * parent directory inode. | |
267 | */ | |
268 | ||
269 | dbg_gen("dent '%.*s', mode %#x in dir ino %lu", | |
270 | dentry->d_name.len, dentry->d_name.name, mode, dir->i_ino); | |
271 | ||
272 | err = ubifs_budget_space(c, &req); | |
273 | if (err) | |
274 | return err; | |
275 | ||
276 | inode = ubifs_new_inode(c, dir, mode); | |
277 | if (IS_ERR(inode)) { | |
278 | err = PTR_ERR(inode); | |
279 | goto out_budg; | |
280 | } | |
281 | ||
282 | mutex_lock(&dir_ui->ui_mutex); | |
283 | dir->i_size += sz_change; | |
284 | dir_ui->ui_size = dir->i_size; | |
285 | dir->i_mtime = dir->i_ctime = inode->i_ctime; | |
286 | err = ubifs_jnl_update(c, dir, &dentry->d_name, inode, 0, 0); | |
287 | if (err) | |
288 | goto out_cancel; | |
289 | mutex_unlock(&dir_ui->ui_mutex); | |
290 | ||
291 | ubifs_release_budget(c, &req); | |
292 | insert_inode_hash(inode); | |
293 | d_instantiate(dentry, inode); | |
294 | return 0; | |
295 | ||
296 | out_cancel: | |
297 | dir->i_size -= sz_change; | |
298 | dir_ui->ui_size = dir->i_size; | |
299 | mutex_unlock(&dir_ui->ui_mutex); | |
300 | make_bad_inode(inode); | |
301 | iput(inode); | |
302 | out_budg: | |
303 | ubifs_release_budget(c, &req); | |
304 | ubifs_err("cannot create regular file, error %d", err); | |
305 | return err; | |
306 | } | |
307 | ||
308 | /** | |
309 | * vfs_dent_type - get VFS directory entry type. | |
310 | * @type: UBIFS directory entry type | |
311 | * | |
312 | * This function converts UBIFS directory entry type into VFS directory entry | |
313 | * type. | |
314 | */ | |
315 | static unsigned int vfs_dent_type(uint8_t type) | |
316 | { | |
317 | switch (type) { | |
318 | case UBIFS_ITYPE_REG: | |
319 | return DT_REG; | |
320 | case UBIFS_ITYPE_DIR: | |
321 | return DT_DIR; | |
322 | case UBIFS_ITYPE_LNK: | |
323 | return DT_LNK; | |
324 | case UBIFS_ITYPE_BLK: | |
325 | return DT_BLK; | |
326 | case UBIFS_ITYPE_CHR: | |
327 | return DT_CHR; | |
328 | case UBIFS_ITYPE_FIFO: | |
329 | return DT_FIFO; | |
330 | case UBIFS_ITYPE_SOCK: | |
331 | return DT_SOCK; | |
332 | default: | |
333 | BUG(); | |
334 | } | |
335 | return 0; | |
336 | } | |
337 | ||
338 | /* | |
339 | * The classical Unix view for directory is that it is a linear array of | |
340 | * (name, inode number) entries. Linux/VFS assumes this model as well. | |
341 | * Particularly, 'readdir()' call wants us to return a directory entry offset | |
342 | * which later may be used to continue 'readdir()'ing the directory or to | |
343 | * 'seek()' to that specific direntry. Obviously UBIFS does not really fit this | |
344 | * model because directory entries are identified by keys, which may collide. | |
345 | * | |
346 | * UBIFS uses directory entry hash value for directory offsets, so | |
347 | * 'seekdir()'/'telldir()' may not always work because of possible key | |
348 | * collisions. But UBIFS guarantees that consecutive 'readdir()' calls work | |
349 | * properly by means of saving full directory entry name in the private field | |
350 | * of the file description object. | |
351 | * | |
352 | * This means that UBIFS cannot support NFS which requires full | |
353 | * 'seekdir()'/'telldir()' support. | |
354 | */ | |
355 | static int ubifs_readdir(struct file *file, void *dirent, filldir_t filldir) | |
356 | { | |
357 | int err, over = 0; | |
358 | struct qstr nm; | |
359 | union ubifs_key key; | |
360 | struct ubifs_dent_node *dent; | |
361 | struct inode *dir = file->f_path.dentry->d_inode; | |
362 | struct ubifs_info *c = dir->i_sb->s_fs_info; | |
363 | ||
364 | dbg_gen("dir ino %lu, f_pos %#llx", dir->i_ino, file->f_pos); | |
365 | ||
366 | if (file->f_pos > UBIFS_S_KEY_HASH_MASK || file->f_pos == 2) | |
367 | /* | |
368 | * The directory was seek'ed to a senseless position or there | |
369 | * are no more entries. | |
370 | */ | |
371 | return 0; | |
372 | ||
373 | /* File positions 0 and 1 correspond to "." and ".." */ | |
374 | if (file->f_pos == 0) { | |
375 | ubifs_assert(!file->private_data); | |
376 | over = filldir(dirent, ".", 1, 0, dir->i_ino, DT_DIR); | |
377 | if (over) | |
378 | return 0; | |
379 | file->f_pos = 1; | |
380 | } | |
381 | ||
382 | if (file->f_pos == 1) { | |
383 | ubifs_assert(!file->private_data); | |
384 | over = filldir(dirent, "..", 2, 1, | |
385 | parent_ino(file->f_path.dentry), DT_DIR); | |
386 | if (over) | |
387 | return 0; | |
388 | ||
389 | /* Find the first entry in TNC and save it */ | |
390 | lowest_dent_key(c, &key, dir->i_ino); | |
391 | nm.name = NULL; | |
392 | dent = ubifs_tnc_next_ent(c, &key, &nm); | |
393 | if (IS_ERR(dent)) { | |
394 | err = PTR_ERR(dent); | |
395 | goto out; | |
396 | } | |
397 | ||
398 | file->f_pos = key_hash_flash(c, &dent->key); | |
399 | file->private_data = dent; | |
400 | } | |
401 | ||
402 | dent = file->private_data; | |
403 | if (!dent) { | |
404 | /* | |
405 | * The directory was seek'ed to and is now readdir'ed. | |
406 | * Find the entry corresponding to @file->f_pos or the | |
407 | * closest one. | |
408 | */ | |
409 | dent_key_init_hash(c, &key, dir->i_ino, file->f_pos); | |
410 | nm.name = NULL; | |
411 | dent = ubifs_tnc_next_ent(c, &key, &nm); | |
412 | if (IS_ERR(dent)) { | |
413 | err = PTR_ERR(dent); | |
414 | goto out; | |
415 | } | |
416 | file->f_pos = key_hash_flash(c, &dent->key); | |
417 | file->private_data = dent; | |
418 | } | |
419 | ||
420 | while (1) { | |
421 | dbg_gen("feed '%s', ino %llu, new f_pos %#x", | |
7424bac8 | 422 | dent->name, (unsigned long long)le64_to_cpu(dent->inum), |
1e51764a | 423 | key_hash_flash(c, &dent->key)); |
0ecb9529 HH |
424 | ubifs_assert(le64_to_cpu(dent->ch.sqnum) > |
425 | ubifs_inode(dir)->creat_sqnum); | |
1e51764a AB |
426 | |
427 | nm.len = le16_to_cpu(dent->nlen); | |
428 | over = filldir(dirent, dent->name, nm.len, file->f_pos, | |
429 | le64_to_cpu(dent->inum), | |
430 | vfs_dent_type(dent->type)); | |
431 | if (over) | |
432 | return 0; | |
433 | ||
434 | /* Switch to the next entry */ | |
435 | key_read(c, &dent->key, &key); | |
436 | nm.name = dent->name; | |
437 | dent = ubifs_tnc_next_ent(c, &key, &nm); | |
438 | if (IS_ERR(dent)) { | |
439 | err = PTR_ERR(dent); | |
440 | goto out; | |
441 | } | |
442 | ||
443 | kfree(file->private_data); | |
444 | file->f_pos = key_hash_flash(c, &dent->key); | |
445 | file->private_data = dent; | |
446 | cond_resched(); | |
447 | } | |
448 | ||
449 | out: | |
450 | if (err != -ENOENT) { | |
451 | ubifs_err("cannot find next direntry, error %d", err); | |
452 | return err; | |
453 | } | |
454 | ||
455 | kfree(file->private_data); | |
456 | file->private_data = NULL; | |
457 | file->f_pos = 2; | |
458 | return 0; | |
459 | } | |
460 | ||
461 | /* If a directory is seeked, we have to free saved readdir() state */ | |
462 | static loff_t ubifs_dir_llseek(struct file *file, loff_t offset, int origin) | |
463 | { | |
464 | kfree(file->private_data); | |
465 | file->private_data = NULL; | |
466 | return generic_file_llseek(file, offset, origin); | |
467 | } | |
468 | ||
469 | /* Free saved readdir() state when the directory is closed */ | |
470 | static int ubifs_dir_release(struct inode *dir, struct file *file) | |
471 | { | |
472 | kfree(file->private_data); | |
473 | file->private_data = NULL; | |
474 | return 0; | |
475 | } | |
476 | ||
477 | /** | |
82c1593c | 478 | * lock_2_inodes - a wrapper for locking two UBIFS inodes. |
1e51764a AB |
479 | * @inode1: first inode |
480 | * @inode2: second inode | |
82c1593c AB |
481 | * |
482 | * We do not implement any tricks to guarantee strict lock ordering, because | |
483 | * VFS has already done it for us on the @i_mutex. So this is just a simple | |
484 | * wrapper function. | |
1e51764a AB |
485 | */ |
486 | static void lock_2_inodes(struct inode *inode1, struct inode *inode2) | |
487 | { | |
82c1593c AB |
488 | mutex_lock_nested(&ubifs_inode(inode1)->ui_mutex, WB_MUTEX_1); |
489 | mutex_lock_nested(&ubifs_inode(inode2)->ui_mutex, WB_MUTEX_2); | |
1e51764a AB |
490 | } |
491 | ||
492 | /** | |
82c1593c | 493 | * unlock_2_inodes - a wrapper for unlocking two UBIFS inodes. |
1e51764a AB |
494 | * @inode1: first inode |
495 | * @inode2: second inode | |
496 | */ | |
497 | static void unlock_2_inodes(struct inode *inode1, struct inode *inode2) | |
498 | { | |
1e51764a | 499 | mutex_unlock(&ubifs_inode(inode2)->ui_mutex); |
82c1593c | 500 | mutex_unlock(&ubifs_inode(inode1)->ui_mutex); |
1e51764a AB |
501 | } |
502 | ||
503 | static int ubifs_link(struct dentry *old_dentry, struct inode *dir, | |
504 | struct dentry *dentry) | |
505 | { | |
506 | struct ubifs_info *c = dir->i_sb->s_fs_info; | |
507 | struct inode *inode = old_dentry->d_inode; | |
508 | struct ubifs_inode *ui = ubifs_inode(inode); | |
509 | struct ubifs_inode *dir_ui = ubifs_inode(dir); | |
510 | int err, sz_change = CALC_DENT_SIZE(dentry->d_name.len); | |
511 | struct ubifs_budget_req req = { .new_dent = 1, .dirtied_ino = 2, | |
dab4b4d2 | 512 | .dirtied_ino_d = ALIGN(ui->data_len, 8) }; |
1e51764a AB |
513 | |
514 | /* | |
515 | * Budget request settings: new direntry, changing the target inode, | |
516 | * changing the parent inode. | |
517 | */ | |
518 | ||
519 | dbg_gen("dent '%.*s' to ino %lu (nlink %d) in dir ino %lu", | |
520 | dentry->d_name.len, dentry->d_name.name, inode->i_ino, | |
521 | inode->i_nlink, dir->i_ino); | |
82c1593c AB |
522 | ubifs_assert(mutex_is_locked(&dir->i_mutex)); |
523 | ubifs_assert(mutex_is_locked(&inode->i_mutex)); | |
8b3884a8 | 524 | |
1e51764a AB |
525 | err = dbg_check_synced_i_size(inode); |
526 | if (err) | |
527 | return err; | |
528 | ||
529 | err = ubifs_budget_space(c, &req); | |
530 | if (err) | |
531 | return err; | |
532 | ||
533 | lock_2_inodes(dir, inode); | |
534 | inc_nlink(inode); | |
7de9c6ee | 535 | ihold(inode); |
1e51764a AB |
536 | inode->i_ctime = ubifs_current_time(inode); |
537 | dir->i_size += sz_change; | |
538 | dir_ui->ui_size = dir->i_size; | |
539 | dir->i_mtime = dir->i_ctime = inode->i_ctime; | |
540 | err = ubifs_jnl_update(c, dir, &dentry->d_name, inode, 0, 0); | |
541 | if (err) | |
542 | goto out_cancel; | |
543 | unlock_2_inodes(dir, inode); | |
544 | ||
545 | ubifs_release_budget(c, &req); | |
546 | d_instantiate(dentry, inode); | |
547 | return 0; | |
548 | ||
549 | out_cancel: | |
550 | dir->i_size -= sz_change; | |
551 | dir_ui->ui_size = dir->i_size; | |
552 | drop_nlink(inode); | |
553 | unlock_2_inodes(dir, inode); | |
554 | ubifs_release_budget(c, &req); | |
555 | iput(inode); | |
556 | return err; | |
557 | } | |
558 | ||
559 | static int ubifs_unlink(struct inode *dir, struct dentry *dentry) | |
560 | { | |
561 | struct ubifs_info *c = dir->i_sb->s_fs_info; | |
562 | struct inode *inode = dentry->d_inode; | |
563 | struct ubifs_inode *dir_ui = ubifs_inode(dir); | |
564 | int sz_change = CALC_DENT_SIZE(dentry->d_name.len); | |
565 | int err, budgeted = 1; | |
566 | struct ubifs_budget_req req = { .mod_dent = 1, .dirtied_ino = 2 }; | |
567 | ||
568 | /* | |
569 | * Budget request settings: deletion direntry, deletion inode (+1 for | |
570 | * @dirtied_ino), changing the parent directory inode. If budgeting | |
571 | * fails, go ahead anyway because we have extra space reserved for | |
572 | * deletions. | |
573 | */ | |
574 | ||
575 | dbg_gen("dent '%.*s' from ino %lu (nlink %d) in dir ino %lu", | |
576 | dentry->d_name.len, dentry->d_name.name, inode->i_ino, | |
577 | inode->i_nlink, dir->i_ino); | |
82c1593c AB |
578 | ubifs_assert(mutex_is_locked(&dir->i_mutex)); |
579 | ubifs_assert(mutex_is_locked(&inode->i_mutex)); | |
1e51764a AB |
580 | err = dbg_check_synced_i_size(inode); |
581 | if (err) | |
582 | return err; | |
583 | ||
584 | err = ubifs_budget_space(c, &req); | |
585 | if (err) { | |
586 | if (err != -ENOSPC) | |
587 | return err; | |
1e51764a AB |
588 | budgeted = 0; |
589 | } | |
590 | ||
591 | lock_2_inodes(dir, inode); | |
592 | inode->i_ctime = ubifs_current_time(dir); | |
593 | drop_nlink(inode); | |
594 | dir->i_size -= sz_change; | |
595 | dir_ui->ui_size = dir->i_size; | |
596 | dir->i_mtime = dir->i_ctime = inode->i_ctime; | |
597 | err = ubifs_jnl_update(c, dir, &dentry->d_name, inode, 1, 0); | |
598 | if (err) | |
599 | goto out_cancel; | |
600 | unlock_2_inodes(dir, inode); | |
601 | ||
602 | if (budgeted) | |
603 | ubifs_release_budget(c, &req); | |
604 | else { | |
605 | /* We've deleted something - clean the "no space" flags */ | |
606 | c->nospace = c->nospace_rp = 0; | |
607 | smp_wmb(); | |
608 | } | |
609 | return 0; | |
610 | ||
611 | out_cancel: | |
612 | dir->i_size += sz_change; | |
613 | dir_ui->ui_size = dir->i_size; | |
614 | inc_nlink(inode); | |
615 | unlock_2_inodes(dir, inode); | |
616 | if (budgeted) | |
617 | ubifs_release_budget(c, &req); | |
618 | return err; | |
619 | } | |
620 | ||
621 | /** | |
622 | * check_dir_empty - check if a directory is empty or not. | |
623 | * @c: UBIFS file-system description object | |
624 | * @dir: VFS inode object of the directory to check | |
625 | * | |
626 | * This function checks if directory @dir is empty. Returns zero if the | |
627 | * directory is empty, %-ENOTEMPTY if it is not, and other negative error codes | |
628 | * in case of of errors. | |
629 | */ | |
630 | static int check_dir_empty(struct ubifs_info *c, struct inode *dir) | |
631 | { | |
632 | struct qstr nm = { .name = NULL }; | |
633 | struct ubifs_dent_node *dent; | |
634 | union ubifs_key key; | |
635 | int err; | |
636 | ||
637 | lowest_dent_key(c, &key, dir->i_ino); | |
638 | dent = ubifs_tnc_next_ent(c, &key, &nm); | |
639 | if (IS_ERR(dent)) { | |
640 | err = PTR_ERR(dent); | |
641 | if (err == -ENOENT) | |
642 | err = 0; | |
643 | } else { | |
644 | kfree(dent); | |
645 | err = -ENOTEMPTY; | |
646 | } | |
647 | return err; | |
648 | } | |
649 | ||
650 | static int ubifs_rmdir(struct inode *dir, struct dentry *dentry) | |
651 | { | |
652 | struct ubifs_info *c = dir->i_sb->s_fs_info; | |
653 | struct inode *inode = dentry->d_inode; | |
654 | int sz_change = CALC_DENT_SIZE(dentry->d_name.len); | |
655 | int err, budgeted = 1; | |
656 | struct ubifs_inode *dir_ui = ubifs_inode(dir); | |
657 | struct ubifs_budget_req req = { .mod_dent = 1, .dirtied_ino = 2 }; | |
658 | ||
659 | /* | |
660 | * Budget request settings: deletion direntry, deletion inode and | |
661 | * changing the parent inode. If budgeting fails, go ahead anyway | |
662 | * because we have extra space reserved for deletions. | |
663 | */ | |
664 | ||
665 | dbg_gen("directory '%.*s', ino %lu in dir ino %lu", dentry->d_name.len, | |
666 | dentry->d_name.name, inode->i_ino, dir->i_ino); | |
82c1593c AB |
667 | ubifs_assert(mutex_is_locked(&dir->i_mutex)); |
668 | ubifs_assert(mutex_is_locked(&inode->i_mutex)); | |
1e51764a AB |
669 | err = check_dir_empty(c, dentry->d_inode); |
670 | if (err) | |
671 | return err; | |
672 | ||
673 | err = ubifs_budget_space(c, &req); | |
674 | if (err) { | |
675 | if (err != -ENOSPC) | |
676 | return err; | |
677 | budgeted = 0; | |
678 | } | |
679 | ||
680 | lock_2_inodes(dir, inode); | |
681 | inode->i_ctime = ubifs_current_time(dir); | |
682 | clear_nlink(inode); | |
683 | drop_nlink(dir); | |
684 | dir->i_size -= sz_change; | |
685 | dir_ui->ui_size = dir->i_size; | |
686 | dir->i_mtime = dir->i_ctime = inode->i_ctime; | |
687 | err = ubifs_jnl_update(c, dir, &dentry->d_name, inode, 1, 0); | |
688 | if (err) | |
689 | goto out_cancel; | |
690 | unlock_2_inodes(dir, inode); | |
691 | ||
692 | if (budgeted) | |
693 | ubifs_release_budget(c, &req); | |
694 | else { | |
695 | /* We've deleted something - clean the "no space" flags */ | |
696 | c->nospace = c->nospace_rp = 0; | |
697 | smp_wmb(); | |
698 | } | |
699 | return 0; | |
700 | ||
701 | out_cancel: | |
702 | dir->i_size += sz_change; | |
703 | dir_ui->ui_size = dir->i_size; | |
704 | inc_nlink(dir); | |
705 | inc_nlink(inode); | |
706 | inc_nlink(inode); | |
707 | unlock_2_inodes(dir, inode); | |
708 | if (budgeted) | |
709 | ubifs_release_budget(c, &req); | |
710 | return err; | |
711 | } | |
712 | ||
713 | static int ubifs_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
714 | { | |
715 | struct inode *inode; | |
716 | struct ubifs_inode *dir_ui = ubifs_inode(dir); | |
717 | struct ubifs_info *c = dir->i_sb->s_fs_info; | |
718 | int err, sz_change = CALC_DENT_SIZE(dentry->d_name.len); | |
182854b4 | 719 | struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1 }; |
1e51764a AB |
720 | |
721 | /* | |
722 | * Budget request settings: new inode, new direntry and changing parent | |
723 | * directory inode. | |
724 | */ | |
725 | ||
726 | dbg_gen("dent '%.*s', mode %#x in dir ino %lu", | |
727 | dentry->d_name.len, dentry->d_name.name, mode, dir->i_ino); | |
728 | ||
729 | err = ubifs_budget_space(c, &req); | |
730 | if (err) | |
731 | return err; | |
732 | ||
733 | inode = ubifs_new_inode(c, dir, S_IFDIR | mode); | |
734 | if (IS_ERR(inode)) { | |
735 | err = PTR_ERR(inode); | |
736 | goto out_budg; | |
737 | } | |
738 | ||
739 | mutex_lock(&dir_ui->ui_mutex); | |
740 | insert_inode_hash(inode); | |
741 | inc_nlink(inode); | |
742 | inc_nlink(dir); | |
743 | dir->i_size += sz_change; | |
744 | dir_ui->ui_size = dir->i_size; | |
745 | dir->i_mtime = dir->i_ctime = inode->i_ctime; | |
746 | err = ubifs_jnl_update(c, dir, &dentry->d_name, inode, 0, 0); | |
747 | if (err) { | |
748 | ubifs_err("cannot create directory, error %d", err); | |
749 | goto out_cancel; | |
750 | } | |
751 | mutex_unlock(&dir_ui->ui_mutex); | |
752 | ||
753 | ubifs_release_budget(c, &req); | |
754 | d_instantiate(dentry, inode); | |
755 | return 0; | |
756 | ||
757 | out_cancel: | |
758 | dir->i_size -= sz_change; | |
759 | dir_ui->ui_size = dir->i_size; | |
760 | drop_nlink(dir); | |
761 | mutex_unlock(&dir_ui->ui_mutex); | |
762 | make_bad_inode(inode); | |
763 | iput(inode); | |
764 | out_budg: | |
765 | ubifs_release_budget(c, &req); | |
766 | return err; | |
767 | } | |
768 | ||
769 | static int ubifs_mknod(struct inode *dir, struct dentry *dentry, | |
770 | int mode, dev_t rdev) | |
771 | { | |
772 | struct inode *inode; | |
773 | struct ubifs_inode *ui; | |
774 | struct ubifs_inode *dir_ui = ubifs_inode(dir); | |
775 | struct ubifs_info *c = dir->i_sb->s_fs_info; | |
776 | union ubifs_dev_desc *dev = NULL; | |
777 | int sz_change = CALC_DENT_SIZE(dentry->d_name.len); | |
778 | int err, devlen = 0; | |
779 | struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1, | |
dab4b4d2 AB |
780 | .new_ino_d = ALIGN(devlen, 8), |
781 | .dirtied_ino = 1 }; | |
1e51764a AB |
782 | |
783 | /* | |
784 | * Budget request settings: new inode, new direntry and changing parent | |
785 | * directory inode. | |
786 | */ | |
787 | ||
788 | dbg_gen("dent '%.*s' in dir ino %lu", | |
789 | dentry->d_name.len, dentry->d_name.name, dir->i_ino); | |
790 | ||
791 | if (!new_valid_dev(rdev)) | |
792 | return -EINVAL; | |
793 | ||
794 | if (S_ISBLK(mode) || S_ISCHR(mode)) { | |
795 | dev = kmalloc(sizeof(union ubifs_dev_desc), GFP_NOFS); | |
796 | if (!dev) | |
797 | return -ENOMEM; | |
798 | devlen = ubifs_encode_dev(dev, rdev); | |
799 | } | |
800 | ||
801 | err = ubifs_budget_space(c, &req); | |
802 | if (err) { | |
803 | kfree(dev); | |
804 | return err; | |
805 | } | |
806 | ||
807 | inode = ubifs_new_inode(c, dir, mode); | |
808 | if (IS_ERR(inode)) { | |
809 | kfree(dev); | |
810 | err = PTR_ERR(inode); | |
811 | goto out_budg; | |
812 | } | |
813 | ||
814 | init_special_inode(inode, inode->i_mode, rdev); | |
815 | inode->i_size = ubifs_inode(inode)->ui_size = devlen; | |
816 | ui = ubifs_inode(inode); | |
817 | ui->data = dev; | |
818 | ui->data_len = devlen; | |
819 | ||
820 | mutex_lock(&dir_ui->ui_mutex); | |
821 | dir->i_size += sz_change; | |
822 | dir_ui->ui_size = dir->i_size; | |
823 | dir->i_mtime = dir->i_ctime = inode->i_ctime; | |
824 | err = ubifs_jnl_update(c, dir, &dentry->d_name, inode, 0, 0); | |
825 | if (err) | |
826 | goto out_cancel; | |
827 | mutex_unlock(&dir_ui->ui_mutex); | |
828 | ||
829 | ubifs_release_budget(c, &req); | |
830 | insert_inode_hash(inode); | |
831 | d_instantiate(dentry, inode); | |
832 | return 0; | |
833 | ||
834 | out_cancel: | |
835 | dir->i_size -= sz_change; | |
836 | dir_ui->ui_size = dir->i_size; | |
837 | mutex_unlock(&dir_ui->ui_mutex); | |
838 | make_bad_inode(inode); | |
839 | iput(inode); | |
840 | out_budg: | |
841 | ubifs_release_budget(c, &req); | |
842 | return err; | |
843 | } | |
844 | ||
845 | static int ubifs_symlink(struct inode *dir, struct dentry *dentry, | |
846 | const char *symname) | |
847 | { | |
848 | struct inode *inode; | |
849 | struct ubifs_inode *ui; | |
850 | struct ubifs_inode *dir_ui = ubifs_inode(dir); | |
851 | struct ubifs_info *c = dir->i_sb->s_fs_info; | |
852 | int err, len = strlen(symname); | |
853 | int sz_change = CALC_DENT_SIZE(dentry->d_name.len); | |
854 | struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1, | |
dab4b4d2 AB |
855 | .new_ino_d = ALIGN(len, 8), |
856 | .dirtied_ino = 1 }; | |
1e51764a AB |
857 | |
858 | /* | |
859 | * Budget request settings: new inode, new direntry and changing parent | |
860 | * directory inode. | |
861 | */ | |
862 | ||
863 | dbg_gen("dent '%.*s', target '%s' in dir ino %lu", dentry->d_name.len, | |
864 | dentry->d_name.name, symname, dir->i_ino); | |
865 | ||
866 | if (len > UBIFS_MAX_INO_DATA) | |
867 | return -ENAMETOOLONG; | |
868 | ||
869 | err = ubifs_budget_space(c, &req); | |
870 | if (err) | |
871 | return err; | |
872 | ||
873 | inode = ubifs_new_inode(c, dir, S_IFLNK | S_IRWXUGO); | |
874 | if (IS_ERR(inode)) { | |
875 | err = PTR_ERR(inode); | |
876 | goto out_budg; | |
877 | } | |
878 | ||
879 | ui = ubifs_inode(inode); | |
880 | ui->data = kmalloc(len + 1, GFP_NOFS); | |
881 | if (!ui->data) { | |
882 | err = -ENOMEM; | |
883 | goto out_inode; | |
884 | } | |
885 | ||
886 | memcpy(ui->data, symname, len); | |
887 | ((char *)ui->data)[len] = '\0'; | |
888 | /* | |
889 | * The terminating zero byte is not written to the flash media and it | |
890 | * is put just to make later in-memory string processing simpler. Thus, | |
891 | * data length is @len, not @len + %1. | |
892 | */ | |
893 | ui->data_len = len; | |
894 | inode->i_size = ubifs_inode(inode)->ui_size = len; | |
895 | ||
896 | mutex_lock(&dir_ui->ui_mutex); | |
897 | dir->i_size += sz_change; | |
898 | dir_ui->ui_size = dir->i_size; | |
899 | dir->i_mtime = dir->i_ctime = inode->i_ctime; | |
900 | err = ubifs_jnl_update(c, dir, &dentry->d_name, inode, 0, 0); | |
901 | if (err) | |
902 | goto out_cancel; | |
903 | mutex_unlock(&dir_ui->ui_mutex); | |
904 | ||
905 | ubifs_release_budget(c, &req); | |
906 | insert_inode_hash(inode); | |
907 | d_instantiate(dentry, inode); | |
908 | return 0; | |
909 | ||
910 | out_cancel: | |
911 | dir->i_size -= sz_change; | |
912 | dir_ui->ui_size = dir->i_size; | |
913 | mutex_unlock(&dir_ui->ui_mutex); | |
914 | out_inode: | |
915 | make_bad_inode(inode); | |
916 | iput(inode); | |
917 | out_budg: | |
918 | ubifs_release_budget(c, &req); | |
919 | return err; | |
920 | } | |
921 | ||
922 | /** | |
82c1593c | 923 | * lock_3_inodes - a wrapper for locking three UBIFS inodes. |
1e51764a AB |
924 | * @inode1: first inode |
925 | * @inode2: second inode | |
926 | * @inode3: third inode | |
927 | * | |
82c1593c AB |
928 | * This function is used for 'ubifs_rename()' and @inode1 may be the same as |
929 | * @inode2 whereas @inode3 may be %NULL. | |
930 | * | |
931 | * We do not implement any tricks to guarantee strict lock ordering, because | |
932 | * VFS has already done it for us on the @i_mutex. So this is just a simple | |
933 | * wrapper function. | |
1e51764a AB |
934 | */ |
935 | static void lock_3_inodes(struct inode *inode1, struct inode *inode2, | |
936 | struct inode *inode3) | |
937 | { | |
82c1593c AB |
938 | mutex_lock_nested(&ubifs_inode(inode1)->ui_mutex, WB_MUTEX_1); |
939 | if (inode2 != inode1) | |
940 | mutex_lock_nested(&ubifs_inode(inode2)->ui_mutex, WB_MUTEX_2); | |
941 | if (inode3) | |
942 | mutex_lock_nested(&ubifs_inode(inode3)->ui_mutex, WB_MUTEX_3); | |
1e51764a AB |
943 | } |
944 | ||
945 | /** | |
82c1593c | 946 | * unlock_3_inodes - a wrapper for unlocking three UBIFS inodes for rename. |
1e51764a AB |
947 | * @inode1: first inode |
948 | * @inode2: second inode | |
949 | * @inode3: third inode | |
950 | */ | |
951 | static void unlock_3_inodes(struct inode *inode1, struct inode *inode2, | |
952 | struct inode *inode3) | |
953 | { | |
1e51764a AB |
954 | if (inode3) |
955 | mutex_unlock(&ubifs_inode(inode3)->ui_mutex); | |
82c1593c AB |
956 | if (inode1 != inode2) |
957 | mutex_unlock(&ubifs_inode(inode2)->ui_mutex); | |
958 | mutex_unlock(&ubifs_inode(inode1)->ui_mutex); | |
1e51764a AB |
959 | } |
960 | ||
961 | static int ubifs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
962 | struct inode *new_dir, struct dentry *new_dentry) | |
963 | { | |
964 | struct ubifs_info *c = old_dir->i_sb->s_fs_info; | |
965 | struct inode *old_inode = old_dentry->d_inode; | |
966 | struct inode *new_inode = new_dentry->d_inode; | |
967 | struct ubifs_inode *old_inode_ui = ubifs_inode(old_inode); | |
968 | int err, release, sync = 0, move = (new_dir != old_dir); | |
969 | int is_dir = S_ISDIR(old_inode->i_mode); | |
970 | int unlink = !!new_inode; | |
971 | int new_sz = CALC_DENT_SIZE(new_dentry->d_name.len); | |
972 | int old_sz = CALC_DENT_SIZE(old_dentry->d_name.len); | |
973 | struct ubifs_budget_req req = { .new_dent = 1, .mod_dent = 1, | |
974 | .dirtied_ino = 3 }; | |
975 | struct ubifs_budget_req ino_req = { .dirtied_ino = 1, | |
dab4b4d2 | 976 | .dirtied_ino_d = ALIGN(old_inode_ui->data_len, 8) }; |
1e51764a AB |
977 | struct timespec time; |
978 | ||
979 | /* | |
980 | * Budget request settings: deletion direntry, new direntry, removing | |
981 | * the old inode, and changing old and new parent directory inodes. | |
982 | * | |
983 | * However, this operation also marks the target inode as dirty and | |
984 | * does not write it, so we allocate budget for the target inode | |
985 | * separately. | |
986 | */ | |
987 | ||
988 | dbg_gen("dent '%.*s' ino %lu in dir ino %lu to dent '%.*s' in " | |
989 | "dir ino %lu", old_dentry->d_name.len, old_dentry->d_name.name, | |
990 | old_inode->i_ino, old_dir->i_ino, new_dentry->d_name.len, | |
991 | new_dentry->d_name.name, new_dir->i_ino); | |
82c1593c AB |
992 | ubifs_assert(mutex_is_locked(&old_dir->i_mutex)); |
993 | ubifs_assert(mutex_is_locked(&new_dir->i_mutex)); | |
994 | if (unlink) | |
995 | ubifs_assert(mutex_is_locked(&new_inode->i_mutex)); | |
996 | ||
1e51764a AB |
997 | |
998 | if (unlink && is_dir) { | |
999 | err = check_dir_empty(c, new_inode); | |
1000 | if (err) | |
1001 | return err; | |
1002 | } | |
1003 | ||
1004 | err = ubifs_budget_space(c, &req); | |
1005 | if (err) | |
1006 | return err; | |
1007 | err = ubifs_budget_space(c, &ino_req); | |
1008 | if (err) { | |
1009 | ubifs_release_budget(c, &req); | |
1010 | return err; | |
1011 | } | |
1012 | ||
1013 | lock_3_inodes(old_dir, new_dir, new_inode); | |
1014 | ||
1015 | /* | |
1016 | * Like most other Unix systems, set the @i_ctime for inodes on a | |
1017 | * rename. | |
1018 | */ | |
1019 | time = ubifs_current_time(old_dir); | |
1020 | old_inode->i_ctime = time; | |
1021 | ||
1022 | /* We must adjust parent link count when renaming directories */ | |
1023 | if (is_dir) { | |
1024 | if (move) { | |
1025 | /* | |
1026 | * @old_dir loses a link because we are moving | |
1027 | * @old_inode to a different directory. | |
1028 | */ | |
1029 | drop_nlink(old_dir); | |
1030 | /* | |
1031 | * @new_dir only gains a link if we are not also | |
1032 | * overwriting an existing directory. | |
1033 | */ | |
1034 | if (!unlink) | |
1035 | inc_nlink(new_dir); | |
1036 | } else { | |
1037 | /* | |
1038 | * @old_inode is not moving to a different directory, | |
1039 | * but @old_dir still loses a link if we are | |
1040 | * overwriting an existing directory. | |
1041 | */ | |
1042 | if (unlink) | |
1043 | drop_nlink(old_dir); | |
1044 | } | |
1045 | } | |
1046 | ||
1047 | old_dir->i_size -= old_sz; | |
1048 | ubifs_inode(old_dir)->ui_size = old_dir->i_size; | |
1049 | old_dir->i_mtime = old_dir->i_ctime = time; | |
1050 | new_dir->i_mtime = new_dir->i_ctime = time; | |
1051 | ||
1052 | /* | |
1053 | * And finally, if we unlinked a direntry which happened to have the | |
1054 | * same name as the moved direntry, we have to decrement @i_nlink of | |
1055 | * the unlinked inode and change its ctime. | |
1056 | */ | |
1057 | if (unlink) { | |
1058 | /* | |
1059 | * Directories cannot have hard-links, so if this is a | |
1060 | * directory, decrement its @i_nlink twice because an empty | |
1061 | * directory has @i_nlink 2. | |
1062 | */ | |
1063 | if (is_dir) | |
1064 | drop_nlink(new_inode); | |
1065 | new_inode->i_ctime = time; | |
1066 | drop_nlink(new_inode); | |
1067 | } else { | |
1068 | new_dir->i_size += new_sz; | |
1069 | ubifs_inode(new_dir)->ui_size = new_dir->i_size; | |
1070 | } | |
1071 | ||
1072 | /* | |
1073 | * Do not ask 'ubifs_jnl_rename()' to flush write-buffer if @old_inode | |
1074 | * is dirty, because this will be done later on at the end of | |
1075 | * 'ubifs_rename()'. | |
1076 | */ | |
1077 | if (IS_SYNC(old_inode)) { | |
1078 | sync = IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir); | |
1079 | if (unlink && IS_SYNC(new_inode)) | |
1080 | sync = 1; | |
1081 | } | |
1082 | err = ubifs_jnl_rename(c, old_dir, old_dentry, new_dir, new_dentry, | |
1083 | sync); | |
1084 | if (err) | |
1085 | goto out_cancel; | |
1086 | ||
1087 | unlock_3_inodes(old_dir, new_dir, new_inode); | |
1088 | ubifs_release_budget(c, &req); | |
1089 | ||
1090 | mutex_lock(&old_inode_ui->ui_mutex); | |
1091 | release = old_inode_ui->dirty; | |
1092 | mark_inode_dirty_sync(old_inode); | |
1093 | mutex_unlock(&old_inode_ui->ui_mutex); | |
1094 | ||
1095 | if (release) | |
1096 | ubifs_release_budget(c, &ino_req); | |
1097 | if (IS_SYNC(old_inode)) | |
a9185b41 | 1098 | err = old_inode->i_sb->s_op->write_inode(old_inode, NULL); |
1e51764a AB |
1099 | return err; |
1100 | ||
1101 | out_cancel: | |
1102 | if (unlink) { | |
1103 | if (is_dir) | |
1104 | inc_nlink(new_inode); | |
1105 | inc_nlink(new_inode); | |
1106 | } else { | |
1107 | new_dir->i_size -= new_sz; | |
1108 | ubifs_inode(new_dir)->ui_size = new_dir->i_size; | |
1109 | } | |
1110 | old_dir->i_size += old_sz; | |
1111 | ubifs_inode(old_dir)->ui_size = old_dir->i_size; | |
1112 | if (is_dir) { | |
1113 | if (move) { | |
1114 | inc_nlink(old_dir); | |
1115 | if (!unlink) | |
1116 | drop_nlink(new_dir); | |
1117 | } else { | |
1118 | if (unlink) | |
1119 | inc_nlink(old_dir); | |
1120 | } | |
1121 | } | |
1122 | unlock_3_inodes(old_dir, new_dir, new_inode); | |
1123 | ubifs_release_budget(c, &ino_req); | |
1124 | ubifs_release_budget(c, &req); | |
1125 | return err; | |
1126 | } | |
1127 | ||
1128 | int ubifs_getattr(struct vfsmount *mnt, struct dentry *dentry, | |
1129 | struct kstat *stat) | |
1130 | { | |
1131 | loff_t size; | |
1132 | struct inode *inode = dentry->d_inode; | |
1133 | struct ubifs_inode *ui = ubifs_inode(inode); | |
1134 | ||
1135 | mutex_lock(&ui->ui_mutex); | |
1136 | stat->dev = inode->i_sb->s_dev; | |
1137 | stat->ino = inode->i_ino; | |
1138 | stat->mode = inode->i_mode; | |
1139 | stat->nlink = inode->i_nlink; | |
1140 | stat->uid = inode->i_uid; | |
1141 | stat->gid = inode->i_gid; | |
1142 | stat->rdev = inode->i_rdev; | |
1143 | stat->atime = inode->i_atime; | |
1144 | stat->mtime = inode->i_mtime; | |
1145 | stat->ctime = inode->i_ctime; | |
1146 | stat->blksize = UBIFS_BLOCK_SIZE; | |
1147 | stat->size = ui->ui_size; | |
1148 | ||
1149 | /* | |
1150 | * Unfortunately, the 'stat()' system call was designed for block | |
1151 | * device based file systems, and it is not appropriate for UBIFS, | |
1152 | * because UBIFS does not have notion of "block". For example, it is | |
1153 | * difficult to tell how many block a directory takes - it actually | |
1154 | * takes less than 300 bytes, but we have to round it to block size, | |
1155 | * which introduces large mistake. This makes utilities like 'du' to | |
1156 | * report completely senseless numbers. This is the reason why UBIFS | |
1157 | * goes the same way as JFFS2 - it reports zero blocks for everything | |
1158 | * but regular files, which makes more sense than reporting completely | |
1159 | * wrong sizes. | |
1160 | */ | |
1161 | if (S_ISREG(inode->i_mode)) { | |
1162 | size = ui->xattr_size; | |
1163 | size += stat->size; | |
1164 | size = ALIGN(size, UBIFS_BLOCK_SIZE); | |
1165 | /* | |
1166 | * Note, user-space expects 512-byte blocks count irrespectively | |
1167 | * of what was reported in @stat->size. | |
1168 | */ | |
1169 | stat->blocks = size >> 9; | |
1170 | } else | |
1171 | stat->blocks = 0; | |
1172 | mutex_unlock(&ui->ui_mutex); | |
1173 | return 0; | |
1174 | } | |
1175 | ||
e8b81566 | 1176 | const struct inode_operations ubifs_dir_inode_operations = { |
1e51764a AB |
1177 | .lookup = ubifs_lookup, |
1178 | .create = ubifs_create, | |
1179 | .link = ubifs_link, | |
1180 | .symlink = ubifs_symlink, | |
1181 | .unlink = ubifs_unlink, | |
1182 | .mkdir = ubifs_mkdir, | |
1183 | .rmdir = ubifs_rmdir, | |
1184 | .mknod = ubifs_mknod, | |
1185 | .rename = ubifs_rename, | |
1186 | .setattr = ubifs_setattr, | |
1187 | .getattr = ubifs_getattr, | |
1188 | #ifdef CONFIG_UBIFS_FS_XATTR | |
1189 | .setxattr = ubifs_setxattr, | |
1190 | .getxattr = ubifs_getxattr, | |
1191 | .listxattr = ubifs_listxattr, | |
1192 | .removexattr = ubifs_removexattr, | |
1193 | #endif | |
1194 | }; | |
1195 | ||
e8b81566 | 1196 | const struct file_operations ubifs_dir_operations = { |
1e51764a AB |
1197 | .llseek = ubifs_dir_llseek, |
1198 | .release = ubifs_dir_release, | |
1199 | .read = generic_read_dir, | |
1200 | .readdir = ubifs_readdir, | |
1201 | .fsync = ubifs_fsync, | |
1202 | .unlocked_ioctl = ubifs_ioctl, | |
1203 | #ifdef CONFIG_COMPAT | |
1204 | .compat_ioctl = ubifs_compat_ioctl, | |
1205 | #endif | |
1206 | }; |