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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 | */ | |
ad44be5c | 59 | static int inherit_flags(const struct inode *dir, umode_t mode) |
1e51764a AB |
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, | |
ad44be5c | 89 | umode_t mode) |
1e51764a AB |
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 | */ | |
12e776a0 | 105 | inode->i_flags |= S_NOCMTIME; |
1e51764a | 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; | |
1e51764a AB |
111 | |
112 | switch (mode & S_IFMT) { | |
113 | case S_IFREG: | |
114 | inode->i_mapping->a_ops = &ubifs_file_address_operations; | |
115 | inode->i_op = &ubifs_file_inode_operations; | |
116 | inode->i_fop = &ubifs_file_operations; | |
117 | break; | |
118 | case S_IFDIR: | |
119 | inode->i_op = &ubifs_dir_inode_operations; | |
120 | inode->i_fop = &ubifs_dir_operations; | |
121 | inode->i_size = ui->ui_size = UBIFS_INO_NODE_SZ; | |
122 | break; | |
123 | case S_IFLNK: | |
124 | inode->i_op = &ubifs_symlink_inode_operations; | |
125 | break; | |
126 | case S_IFSOCK: | |
127 | case S_IFIFO: | |
128 | case S_IFBLK: | |
129 | case S_IFCHR: | |
130 | inode->i_op = &ubifs_file_inode_operations; | |
131 | break; | |
132 | default: | |
133 | BUG(); | |
134 | } | |
135 | ||
136 | ui->flags = inherit_flags(dir, mode); | |
137 | ubifs_set_inode_flags(inode); | |
138 | if (S_ISREG(mode)) | |
139 | ui->compr_type = c->default_compr; | |
140 | else | |
141 | ui->compr_type = UBIFS_COMPR_NONE; | |
142 | ui->synced_i_size = 0; | |
143 | ||
144 | spin_lock(&c->cnt_lock); | |
145 | /* Inode number overflow is currently not supported */ | |
146 | if (c->highest_inum >= INUM_WARN_WATERMARK) { | |
147 | if (c->highest_inum >= INUM_WATERMARK) { | |
148 | spin_unlock(&c->cnt_lock); | |
235c362b | 149 | ubifs_err(c, "out of inode numbers"); |
1e51764a AB |
150 | make_bad_inode(inode); |
151 | iput(inode); | |
152 | return ERR_PTR(-EINVAL); | |
153 | } | |
1a7e985d | 154 | ubifs_warn(c, "running out of inode numbers (current %lu, max %u)", |
e84461ad | 155 | (unsigned long)c->highest_inum, INUM_WATERMARK); |
1e51764a AB |
156 | } |
157 | ||
158 | inode->i_ino = ++c->highest_inum; | |
1e51764a AB |
159 | /* |
160 | * The creation sequence number remains with this inode for its | |
161 | * lifetime. All nodes for this inode have a greater sequence number, | |
162 | * and so it is possible to distinguish obsolete nodes belonging to a | |
163 | * previous incarnation of the same inode number - for example, for the | |
164 | * purpose of rebuilding the index. | |
165 | */ | |
166 | ui->creat_sqnum = ++c->max_sqnum; | |
167 | spin_unlock(&c->cnt_lock); | |
168 | return inode; | |
169 | } | |
170 | ||
bb2615d4 AB |
171 | static int dbg_check_name(const struct ubifs_info *c, |
172 | const struct ubifs_dent_node *dent, | |
173 | const struct qstr *nm) | |
1e51764a | 174 | { |
2b1844a8 | 175 | if (!dbg_is_chk_gen(c)) |
1e51764a AB |
176 | return 0; |
177 | if (le16_to_cpu(dent->nlen) != nm->len) | |
178 | return -EINVAL; | |
179 | if (memcmp(dent->name, nm->name, nm->len)) | |
180 | return -EINVAL; | |
181 | return 0; | |
182 | } | |
183 | ||
1e51764a | 184 | static struct dentry *ubifs_lookup(struct inode *dir, struct dentry *dentry, |
00cd8dd3 | 185 | unsigned int flags) |
1e51764a AB |
186 | { |
187 | int err; | |
188 | union ubifs_key key; | |
189 | struct inode *inode = NULL; | |
190 | struct ubifs_dent_node *dent; | |
191 | struct ubifs_info *c = dir->i_sb->s_fs_info; | |
192 | ||
4cb2a01d | 193 | dbg_gen("'%pd' in dir ino %lu", dentry, dir->i_ino); |
1e51764a AB |
194 | |
195 | if (dentry->d_name.len > UBIFS_MAX_NLEN) | |
196 | return ERR_PTR(-ENAMETOOLONG); | |
197 | ||
198 | dent = kmalloc(UBIFS_MAX_DENT_NODE_SZ, GFP_NOFS); | |
199 | if (!dent) | |
200 | return ERR_PTR(-ENOMEM); | |
201 | ||
202 | dent_key_init(c, &key, dir->i_ino, &dentry->d_name); | |
203 | ||
204 | err = ubifs_tnc_lookup_nm(c, &key, dent, &dentry->d_name); | |
205 | if (err) { | |
720b499c | 206 | if (err == -ENOENT) { |
1e51764a AB |
207 | dbg_gen("not found"); |
208 | goto done; | |
209 | } | |
210 | goto out; | |
211 | } | |
212 | ||
bb2615d4 | 213 | if (dbg_check_name(c, dent, &dentry->d_name)) { |
1e51764a AB |
214 | err = -EINVAL; |
215 | goto out; | |
216 | } | |
217 | ||
218 | inode = ubifs_iget(dir->i_sb, le64_to_cpu(dent->inum)); | |
219 | if (IS_ERR(inode)) { | |
220 | /* | |
221 | * This should not happen. Probably the file-system needs | |
222 | * checking. | |
223 | */ | |
224 | err = PTR_ERR(inode); | |
235c362b | 225 | ubifs_err(c, "dead directory entry '%pd', error %d", |
4cb2a01d | 226 | dentry, err); |
1e51764a AB |
227 | ubifs_ro_mode(c, err); |
228 | goto out; | |
229 | } | |
230 | ||
231 | done: | |
232 | kfree(dent); | |
233 | /* | |
234 | * Note, d_splice_alias() would be required instead if we supported | |
235 | * NFS. | |
236 | */ | |
237 | d_add(dentry, inode); | |
238 | return NULL; | |
239 | ||
240 | out: | |
241 | kfree(dent); | |
242 | return ERR_PTR(err); | |
243 | } | |
244 | ||
4acdaf27 | 245 | static int ubifs_create(struct inode *dir, struct dentry *dentry, umode_t mode, |
ebfc3b49 | 246 | bool excl) |
1e51764a AB |
247 | { |
248 | struct inode *inode; | |
249 | struct ubifs_info *c = dir->i_sb->s_fs_info; | |
250 | int err, sz_change = CALC_DENT_SIZE(dentry->d_name.len); | |
251 | struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1, | |
252 | .dirtied_ino = 1 }; | |
253 | struct ubifs_inode *dir_ui = ubifs_inode(dir); | |
254 | ||
255 | /* | |
256 | * Budget request settings: new inode, new direntry, changing the | |
257 | * parent directory inode. | |
258 | */ | |
259 | ||
4cb2a01d AV |
260 | dbg_gen("dent '%pd', mode %#hx in dir ino %lu", |
261 | dentry, mode, dir->i_ino); | |
1e51764a AB |
262 | |
263 | err = ubifs_budget_space(c, &req); | |
264 | if (err) | |
265 | return err; | |
266 | ||
267 | inode = ubifs_new_inode(c, dir, mode); | |
268 | if (IS_ERR(inode)) { | |
269 | err = PTR_ERR(inode); | |
270 | goto out_budg; | |
271 | } | |
272 | ||
d7f0b70d SN |
273 | err = ubifs_init_security(dir, inode, &dentry->d_name); |
274 | if (err) | |
9401a795 | 275 | goto out_inode; |
d7f0b70d | 276 | |
1e51764a AB |
277 | mutex_lock(&dir_ui->ui_mutex); |
278 | dir->i_size += sz_change; | |
279 | dir_ui->ui_size = dir->i_size; | |
280 | dir->i_mtime = dir->i_ctime = inode->i_ctime; | |
281 | err = ubifs_jnl_update(c, dir, &dentry->d_name, inode, 0, 0); | |
282 | if (err) | |
283 | goto out_cancel; | |
284 | mutex_unlock(&dir_ui->ui_mutex); | |
285 | ||
286 | ubifs_release_budget(c, &req); | |
287 | insert_inode_hash(inode); | |
288 | d_instantiate(dentry, inode); | |
289 | return 0; | |
290 | ||
291 | out_cancel: | |
292 | dir->i_size -= sz_change; | |
293 | dir_ui->ui_size = dir->i_size; | |
294 | mutex_unlock(&dir_ui->ui_mutex); | |
9401a795 | 295 | out_inode: |
1e51764a AB |
296 | make_bad_inode(inode); |
297 | iput(inode); | |
298 | out_budg: | |
299 | ubifs_release_budget(c, &req); | |
235c362b | 300 | ubifs_err(c, "cannot create regular file, error %d", err); |
1e51764a AB |
301 | return err; |
302 | } | |
303 | ||
9e0a1fff RW |
304 | static int do_tmpfile(struct inode *dir, struct dentry *dentry, |
305 | umode_t mode, struct inode **whiteout) | |
474b9370 RW |
306 | { |
307 | struct inode *inode; | |
308 | struct ubifs_info *c = dir->i_sb->s_fs_info; | |
309 | struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1}; | |
310 | struct ubifs_budget_req ino_req = { .dirtied_ino = 1 }; | |
311 | struct ubifs_inode *ui, *dir_ui = ubifs_inode(dir); | |
312 | int err, instantiated = 0; | |
313 | ||
314 | /* | |
315 | * Budget request settings: new dirty inode, new direntry, | |
316 | * budget for dirtied inode will be released via writeback. | |
317 | */ | |
318 | ||
319 | dbg_gen("dent '%pd', mode %#hx in dir ino %lu", | |
320 | dentry, mode, dir->i_ino); | |
321 | ||
322 | err = ubifs_budget_space(c, &req); | |
323 | if (err) | |
324 | return err; | |
325 | ||
326 | err = ubifs_budget_space(c, &ino_req); | |
327 | if (err) { | |
328 | ubifs_release_budget(c, &req); | |
329 | return err; | |
330 | } | |
331 | ||
332 | inode = ubifs_new_inode(c, dir, mode); | |
333 | if (IS_ERR(inode)) { | |
334 | err = PTR_ERR(inode); | |
335 | goto out_budg; | |
336 | } | |
337 | ui = ubifs_inode(inode); | |
338 | ||
9e0a1fff RW |
339 | if (whiteout) { |
340 | init_special_inode(inode, inode->i_mode, WHITEOUT_DEV); | |
341 | ubifs_assert(inode->i_op == &ubifs_file_inode_operations); | |
342 | } | |
343 | ||
474b9370 RW |
344 | err = ubifs_init_security(dir, inode, &dentry->d_name); |
345 | if (err) | |
346 | goto out_inode; | |
347 | ||
348 | mutex_lock(&ui->ui_mutex); | |
349 | insert_inode_hash(inode); | |
9e0a1fff RW |
350 | |
351 | if (whiteout) { | |
352 | mark_inode_dirty(inode); | |
353 | drop_nlink(inode); | |
354 | *whiteout = inode; | |
355 | } else { | |
356 | d_tmpfile(dentry, inode); | |
357 | } | |
474b9370 | 358 | ubifs_assert(ui->dirty); |
9e0a1fff | 359 | |
474b9370 RW |
360 | instantiated = 1; |
361 | mutex_unlock(&ui->ui_mutex); | |
362 | ||
363 | mutex_lock(&dir_ui->ui_mutex); | |
364 | err = ubifs_jnl_update(c, dir, &dentry->d_name, inode, 1, 0); | |
365 | if (err) | |
366 | goto out_cancel; | |
367 | mutex_unlock(&dir_ui->ui_mutex); | |
368 | ||
369 | ubifs_release_budget(c, &req); | |
370 | ||
371 | return 0; | |
372 | ||
373 | out_cancel: | |
374 | mutex_unlock(&dir_ui->ui_mutex); | |
375 | out_inode: | |
376 | make_bad_inode(inode); | |
377 | if (!instantiated) | |
378 | iput(inode); | |
379 | out_budg: | |
380 | ubifs_release_budget(c, &req); | |
381 | if (!instantiated) | |
382 | ubifs_release_budget(c, &ino_req); | |
383 | ubifs_err(c, "cannot create temporary file, error %d", err); | |
384 | return err; | |
385 | } | |
386 | ||
9e0a1fff RW |
387 | static int ubifs_tmpfile(struct inode *dir, struct dentry *dentry, |
388 | umode_t mode) | |
389 | { | |
390 | return do_tmpfile(dir, dentry, mode, NULL); | |
391 | } | |
392 | ||
1e51764a AB |
393 | /** |
394 | * vfs_dent_type - get VFS directory entry type. | |
395 | * @type: UBIFS directory entry type | |
396 | * | |
397 | * This function converts UBIFS directory entry type into VFS directory entry | |
398 | * type. | |
399 | */ | |
400 | static unsigned int vfs_dent_type(uint8_t type) | |
401 | { | |
402 | switch (type) { | |
403 | case UBIFS_ITYPE_REG: | |
404 | return DT_REG; | |
405 | case UBIFS_ITYPE_DIR: | |
406 | return DT_DIR; | |
407 | case UBIFS_ITYPE_LNK: | |
408 | return DT_LNK; | |
409 | case UBIFS_ITYPE_BLK: | |
410 | return DT_BLK; | |
411 | case UBIFS_ITYPE_CHR: | |
412 | return DT_CHR; | |
413 | case UBIFS_ITYPE_FIFO: | |
414 | return DT_FIFO; | |
415 | case UBIFS_ITYPE_SOCK: | |
416 | return DT_SOCK; | |
417 | default: | |
418 | BUG(); | |
419 | } | |
420 | return 0; | |
421 | } | |
422 | ||
423 | /* | |
424 | * The classical Unix view for directory is that it is a linear array of | |
425 | * (name, inode number) entries. Linux/VFS assumes this model as well. | |
426 | * Particularly, 'readdir()' call wants us to return a directory entry offset | |
427 | * which later may be used to continue 'readdir()'ing the directory or to | |
428 | * 'seek()' to that specific direntry. Obviously UBIFS does not really fit this | |
429 | * model because directory entries are identified by keys, which may collide. | |
430 | * | |
431 | * UBIFS uses directory entry hash value for directory offsets, so | |
432 | * 'seekdir()'/'telldir()' may not always work because of possible key | |
433 | * collisions. But UBIFS guarantees that consecutive 'readdir()' calls work | |
434 | * properly by means of saving full directory entry name in the private field | |
435 | * of the file description object. | |
436 | * | |
437 | * This means that UBIFS cannot support NFS which requires full | |
438 | * 'seekdir()'/'telldir()' support. | |
439 | */ | |
01122e06 | 440 | static int ubifs_readdir(struct file *file, struct dir_context *ctx) |
1e51764a | 441 | { |
c83ed4c9 | 442 | int err = 0; |
1e51764a AB |
443 | struct qstr nm; |
444 | union ubifs_key key; | |
445 | struct ubifs_dent_node *dent; | |
496ad9aa | 446 | struct inode *dir = file_inode(file); |
1e51764a AB |
447 | struct ubifs_info *c = dir->i_sb->s_fs_info; |
448 | ||
01122e06 | 449 | dbg_gen("dir ino %lu, f_pos %#llx", dir->i_ino, ctx->pos); |
1e51764a | 450 | |
01122e06 | 451 | if (ctx->pos > UBIFS_S_KEY_HASH_MASK || ctx->pos == 2) |
1e51764a AB |
452 | /* |
453 | * The directory was seek'ed to a senseless position or there | |
454 | * are no more entries. | |
455 | */ | |
456 | return 0; | |
457 | ||
605c912b AB |
458 | if (file->f_version == 0) { |
459 | /* | |
460 | * The file was seek'ed, which means that @file->private_data | |
461 | * is now invalid. This may also be just the first | |
462 | * 'ubifs_readdir()' invocation, in which case | |
463 | * @file->private_data is NULL, and the below code is | |
464 | * basically a no-op. | |
465 | */ | |
466 | kfree(file->private_data); | |
467 | file->private_data = NULL; | |
468 | } | |
469 | ||
470 | /* | |
471 | * 'generic_file_llseek()' unconditionally sets @file->f_version to | |
472 | * zero, and we use this for detecting whether the file was seek'ed. | |
473 | */ | |
474 | file->f_version = 1; | |
475 | ||
1e51764a | 476 | /* File positions 0 and 1 correspond to "." and ".." */ |
01122e06 | 477 | if (ctx->pos < 2) { |
1e51764a | 478 | ubifs_assert(!file->private_data); |
01122e06 | 479 | if (!dir_emit_dots(file, ctx)) |
1e51764a AB |
480 | return 0; |
481 | ||
482 | /* Find the first entry in TNC and save it */ | |
483 | lowest_dent_key(c, &key, dir->i_ino); | |
484 | nm.name = NULL; | |
485 | dent = ubifs_tnc_next_ent(c, &key, &nm); | |
486 | if (IS_ERR(dent)) { | |
487 | err = PTR_ERR(dent); | |
488 | goto out; | |
489 | } | |
490 | ||
01122e06 | 491 | ctx->pos = key_hash_flash(c, &dent->key); |
1e51764a AB |
492 | file->private_data = dent; |
493 | } | |
494 | ||
495 | dent = file->private_data; | |
496 | if (!dent) { | |
497 | /* | |
498 | * The directory was seek'ed to and is now readdir'ed. | |
01122e06 | 499 | * Find the entry corresponding to @ctx->pos or the closest one. |
1e51764a | 500 | */ |
01122e06 | 501 | dent_key_init_hash(c, &key, dir->i_ino, ctx->pos); |
1e51764a AB |
502 | nm.name = NULL; |
503 | dent = ubifs_tnc_next_ent(c, &key, &nm); | |
504 | if (IS_ERR(dent)) { | |
505 | err = PTR_ERR(dent); | |
506 | goto out; | |
507 | } | |
01122e06 | 508 | ctx->pos = key_hash_flash(c, &dent->key); |
1e51764a AB |
509 | file->private_data = dent; |
510 | } | |
511 | ||
512 | while (1) { | |
513 | dbg_gen("feed '%s', ino %llu, new f_pos %#x", | |
7424bac8 | 514 | dent->name, (unsigned long long)le64_to_cpu(dent->inum), |
1e51764a | 515 | key_hash_flash(c, &dent->key)); |
0ecb9529 HH |
516 | ubifs_assert(le64_to_cpu(dent->ch.sqnum) > |
517 | ubifs_inode(dir)->creat_sqnum); | |
1e51764a AB |
518 | |
519 | nm.len = le16_to_cpu(dent->nlen); | |
01122e06 | 520 | if (!dir_emit(ctx, dent->name, nm.len, |
1e51764a | 521 | le64_to_cpu(dent->inum), |
01122e06 | 522 | vfs_dent_type(dent->type))) |
1e51764a AB |
523 | return 0; |
524 | ||
525 | /* Switch to the next entry */ | |
526 | key_read(c, &dent->key, &key); | |
527 | nm.name = dent->name; | |
528 | dent = ubifs_tnc_next_ent(c, &key, &nm); | |
529 | if (IS_ERR(dent)) { | |
530 | err = PTR_ERR(dent); | |
531 | goto out; | |
532 | } | |
533 | ||
534 | kfree(file->private_data); | |
01122e06 | 535 | ctx->pos = key_hash_flash(c, &dent->key); |
1e51764a AB |
536 | file->private_data = dent; |
537 | cond_resched(); | |
538 | } | |
539 | ||
540 | out: | |
aeeb14f7 RW |
541 | kfree(file->private_data); |
542 | file->private_data = NULL; | |
543 | ||
c83ed4c9 | 544 | if (err != -ENOENT) |
235c362b | 545 | ubifs_err(c, "cannot find next direntry, error %d", err); |
a00052a2 RW |
546 | else |
547 | /* | |
548 | * -ENOENT is a non-fatal error in this context, the TNC uses | |
549 | * it to indicate that the cursor moved past the current directory | |
550 | * and readdir() has to stop. | |
551 | */ | |
552 | err = 0; | |
553 | ||
1e51764a | 554 | |
605c912b | 555 | /* 2 is a special value indicating that there are no more direntries */ |
01122e06 | 556 | ctx->pos = 2; |
c83ed4c9 | 557 | return err; |
1e51764a AB |
558 | } |
559 | ||
1e51764a AB |
560 | /* Free saved readdir() state when the directory is closed */ |
561 | static int ubifs_dir_release(struct inode *dir, struct file *file) | |
562 | { | |
563 | kfree(file->private_data); | |
564 | file->private_data = NULL; | |
565 | return 0; | |
566 | } | |
567 | ||
568 | /** | |
82c1593c | 569 | * lock_2_inodes - a wrapper for locking two UBIFS inodes. |
1e51764a AB |
570 | * @inode1: first inode |
571 | * @inode2: second inode | |
82c1593c AB |
572 | * |
573 | * We do not implement any tricks to guarantee strict lock ordering, because | |
574 | * VFS has already done it for us on the @i_mutex. So this is just a simple | |
575 | * wrapper function. | |
1e51764a AB |
576 | */ |
577 | static void lock_2_inodes(struct inode *inode1, struct inode *inode2) | |
578 | { | |
82c1593c AB |
579 | mutex_lock_nested(&ubifs_inode(inode1)->ui_mutex, WB_MUTEX_1); |
580 | mutex_lock_nested(&ubifs_inode(inode2)->ui_mutex, WB_MUTEX_2); | |
1e51764a AB |
581 | } |
582 | ||
583 | /** | |
82c1593c | 584 | * unlock_2_inodes - a wrapper for unlocking two UBIFS inodes. |
1e51764a AB |
585 | * @inode1: first inode |
586 | * @inode2: second inode | |
587 | */ | |
588 | static void unlock_2_inodes(struct inode *inode1, struct inode *inode2) | |
589 | { | |
1e51764a | 590 | mutex_unlock(&ubifs_inode(inode2)->ui_mutex); |
82c1593c | 591 | mutex_unlock(&ubifs_inode(inode1)->ui_mutex); |
1e51764a AB |
592 | } |
593 | ||
594 | static int ubifs_link(struct dentry *old_dentry, struct inode *dir, | |
595 | struct dentry *dentry) | |
596 | { | |
597 | struct ubifs_info *c = dir->i_sb->s_fs_info; | |
2b0143b5 | 598 | struct inode *inode = d_inode(old_dentry); |
1e51764a AB |
599 | struct ubifs_inode *ui = ubifs_inode(inode); |
600 | struct ubifs_inode *dir_ui = ubifs_inode(dir); | |
601 | int err, sz_change = CALC_DENT_SIZE(dentry->d_name.len); | |
602 | struct ubifs_budget_req req = { .new_dent = 1, .dirtied_ino = 2, | |
dab4b4d2 | 603 | .dirtied_ino_d = ALIGN(ui->data_len, 8) }; |
1e51764a AB |
604 | |
605 | /* | |
606 | * Budget request settings: new direntry, changing the target inode, | |
607 | * changing the parent inode. | |
608 | */ | |
609 | ||
4cb2a01d AV |
610 | dbg_gen("dent '%pd' to ino %lu (nlink %d) in dir ino %lu", |
611 | dentry, inode->i_ino, | |
1e51764a | 612 | inode->i_nlink, dir->i_ino); |
5955102c AV |
613 | ubifs_assert(inode_is_locked(dir)); |
614 | ubifs_assert(inode_is_locked(inode)); | |
8b3884a8 | 615 | |
d808efb4 | 616 | err = dbg_check_synced_i_size(c, inode); |
1e51764a AB |
617 | if (err) |
618 | return err; | |
619 | ||
620 | err = ubifs_budget_space(c, &req); | |
621 | if (err) | |
622 | return err; | |
623 | ||
624 | lock_2_inodes(dir, inode); | |
625 | inc_nlink(inode); | |
7de9c6ee | 626 | ihold(inode); |
1e51764a AB |
627 | inode->i_ctime = ubifs_current_time(inode); |
628 | dir->i_size += sz_change; | |
629 | dir_ui->ui_size = dir->i_size; | |
630 | dir->i_mtime = dir->i_ctime = inode->i_ctime; | |
631 | err = ubifs_jnl_update(c, dir, &dentry->d_name, inode, 0, 0); | |
632 | if (err) | |
633 | goto out_cancel; | |
634 | unlock_2_inodes(dir, inode); | |
635 | ||
636 | ubifs_release_budget(c, &req); | |
637 | d_instantiate(dentry, inode); | |
638 | return 0; | |
639 | ||
640 | out_cancel: | |
641 | dir->i_size -= sz_change; | |
642 | dir_ui->ui_size = dir->i_size; | |
643 | drop_nlink(inode); | |
644 | unlock_2_inodes(dir, inode); | |
645 | ubifs_release_budget(c, &req); | |
646 | iput(inode); | |
647 | return err; | |
648 | } | |
649 | ||
650 | static int ubifs_unlink(struct inode *dir, struct dentry *dentry) | |
651 | { | |
652 | struct ubifs_info *c = dir->i_sb->s_fs_info; | |
2b0143b5 | 653 | struct inode *inode = d_inode(dentry); |
1e51764a AB |
654 | struct ubifs_inode *dir_ui = ubifs_inode(dir); |
655 | int sz_change = CALC_DENT_SIZE(dentry->d_name.len); | |
656 | int err, budgeted = 1; | |
657 | struct ubifs_budget_req req = { .mod_dent = 1, .dirtied_ino = 2 }; | |
c43be108 | 658 | unsigned int saved_nlink = inode->i_nlink; |
1e51764a AB |
659 | |
660 | /* | |
661 | * Budget request settings: deletion direntry, deletion inode (+1 for | |
662 | * @dirtied_ino), changing the parent directory inode. If budgeting | |
663 | * fails, go ahead anyway because we have extra space reserved for | |
664 | * deletions. | |
665 | */ | |
666 | ||
4cb2a01d AV |
667 | dbg_gen("dent '%pd' from ino %lu (nlink %d) in dir ino %lu", |
668 | dentry, inode->i_ino, | |
1e51764a | 669 | inode->i_nlink, dir->i_ino); |
5955102c AV |
670 | ubifs_assert(inode_is_locked(dir)); |
671 | ubifs_assert(inode_is_locked(inode)); | |
d808efb4 | 672 | err = dbg_check_synced_i_size(c, inode); |
1e51764a AB |
673 | if (err) |
674 | return err; | |
675 | ||
676 | err = ubifs_budget_space(c, &req); | |
677 | if (err) { | |
678 | if (err != -ENOSPC) | |
679 | return err; | |
1e51764a AB |
680 | budgeted = 0; |
681 | } | |
682 | ||
683 | lock_2_inodes(dir, inode); | |
684 | inode->i_ctime = ubifs_current_time(dir); | |
685 | drop_nlink(inode); | |
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 */ | |
b137545c | 698 | c->bi.nospace = c->bi.nospace_rp = 0; |
1e51764a AB |
699 | smp_wmb(); |
700 | } | |
701 | return 0; | |
702 | ||
703 | out_cancel: | |
704 | dir->i_size += sz_change; | |
705 | dir_ui->ui_size = dir->i_size; | |
c43be108 | 706 | set_nlink(inode, saved_nlink); |
1e51764a AB |
707 | unlock_2_inodes(dir, inode); |
708 | if (budgeted) | |
709 | ubifs_release_budget(c, &req); | |
710 | return err; | |
711 | } | |
712 | ||
713 | /** | |
714 | * check_dir_empty - check if a directory is empty or not. | |
715 | * @c: UBIFS file-system description object | |
716 | * @dir: VFS inode object of the directory to check | |
717 | * | |
718 | * This function checks if directory @dir is empty. Returns zero if the | |
719 | * directory is empty, %-ENOTEMPTY if it is not, and other negative error codes | |
720 | * in case of of errors. | |
721 | */ | |
722 | static int check_dir_empty(struct ubifs_info *c, struct inode *dir) | |
723 | { | |
724 | struct qstr nm = { .name = NULL }; | |
725 | struct ubifs_dent_node *dent; | |
726 | union ubifs_key key; | |
727 | int err; | |
728 | ||
729 | lowest_dent_key(c, &key, dir->i_ino); | |
730 | dent = ubifs_tnc_next_ent(c, &key, &nm); | |
731 | if (IS_ERR(dent)) { | |
732 | err = PTR_ERR(dent); | |
733 | if (err == -ENOENT) | |
734 | err = 0; | |
735 | } else { | |
736 | kfree(dent); | |
737 | err = -ENOTEMPTY; | |
738 | } | |
739 | return err; | |
740 | } | |
741 | ||
742 | static int ubifs_rmdir(struct inode *dir, struct dentry *dentry) | |
743 | { | |
744 | struct ubifs_info *c = dir->i_sb->s_fs_info; | |
2b0143b5 | 745 | struct inode *inode = d_inode(dentry); |
1e51764a AB |
746 | int sz_change = CALC_DENT_SIZE(dentry->d_name.len); |
747 | int err, budgeted = 1; | |
748 | struct ubifs_inode *dir_ui = ubifs_inode(dir); | |
749 | struct ubifs_budget_req req = { .mod_dent = 1, .dirtied_ino = 2 }; | |
750 | ||
751 | /* | |
752 | * Budget request settings: deletion direntry, deletion inode and | |
753 | * changing the parent inode. If budgeting fails, go ahead anyway | |
754 | * because we have extra space reserved for deletions. | |
755 | */ | |
756 | ||
4cb2a01d AV |
757 | dbg_gen("directory '%pd', ino %lu in dir ino %lu", dentry, |
758 | inode->i_ino, dir->i_ino); | |
5955102c AV |
759 | ubifs_assert(inode_is_locked(dir)); |
760 | ubifs_assert(inode_is_locked(inode)); | |
2b0143b5 | 761 | err = check_dir_empty(c, d_inode(dentry)); |
1e51764a AB |
762 | if (err) |
763 | return err; | |
764 | ||
765 | err = ubifs_budget_space(c, &req); | |
766 | if (err) { | |
767 | if (err != -ENOSPC) | |
768 | return err; | |
769 | budgeted = 0; | |
770 | } | |
771 | ||
772 | lock_2_inodes(dir, inode); | |
773 | inode->i_ctime = ubifs_current_time(dir); | |
774 | clear_nlink(inode); | |
775 | drop_nlink(dir); | |
776 | dir->i_size -= sz_change; | |
777 | dir_ui->ui_size = dir->i_size; | |
778 | dir->i_mtime = dir->i_ctime = inode->i_ctime; | |
779 | err = ubifs_jnl_update(c, dir, &dentry->d_name, inode, 1, 0); | |
780 | if (err) | |
781 | goto out_cancel; | |
782 | unlock_2_inodes(dir, inode); | |
783 | ||
784 | if (budgeted) | |
785 | ubifs_release_budget(c, &req); | |
786 | else { | |
787 | /* We've deleted something - clean the "no space" flags */ | |
b137545c | 788 | c->bi.nospace = c->bi.nospace_rp = 0; |
1e51764a AB |
789 | smp_wmb(); |
790 | } | |
791 | return 0; | |
792 | ||
793 | out_cancel: | |
794 | dir->i_size += sz_change; | |
795 | dir_ui->ui_size = dir->i_size; | |
796 | inc_nlink(dir); | |
c43be108 | 797 | set_nlink(inode, 2); |
1e51764a AB |
798 | unlock_2_inodes(dir, inode); |
799 | if (budgeted) | |
800 | ubifs_release_budget(c, &req); | |
801 | return err; | |
802 | } | |
803 | ||
18bb1db3 | 804 | static int ubifs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
1e51764a AB |
805 | { |
806 | struct inode *inode; | |
807 | struct ubifs_inode *dir_ui = ubifs_inode(dir); | |
808 | struct ubifs_info *c = dir->i_sb->s_fs_info; | |
809 | int err, sz_change = CALC_DENT_SIZE(dentry->d_name.len); | |
182854b4 | 810 | struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1 }; |
1e51764a AB |
811 | |
812 | /* | |
813 | * Budget request settings: new inode, new direntry and changing parent | |
814 | * directory inode. | |
815 | */ | |
816 | ||
4cb2a01d AV |
817 | dbg_gen("dent '%pd', mode %#hx in dir ino %lu", |
818 | dentry, mode, dir->i_ino); | |
1e51764a AB |
819 | |
820 | err = ubifs_budget_space(c, &req); | |
821 | if (err) | |
822 | return err; | |
823 | ||
824 | inode = ubifs_new_inode(c, dir, S_IFDIR | mode); | |
825 | if (IS_ERR(inode)) { | |
826 | err = PTR_ERR(inode); | |
827 | goto out_budg; | |
828 | } | |
829 | ||
d7f0b70d SN |
830 | err = ubifs_init_security(dir, inode, &dentry->d_name); |
831 | if (err) | |
9401a795 | 832 | goto out_inode; |
d7f0b70d | 833 | |
1e51764a AB |
834 | mutex_lock(&dir_ui->ui_mutex); |
835 | insert_inode_hash(inode); | |
836 | inc_nlink(inode); | |
837 | inc_nlink(dir); | |
838 | dir->i_size += sz_change; | |
839 | dir_ui->ui_size = dir->i_size; | |
840 | dir->i_mtime = dir->i_ctime = inode->i_ctime; | |
841 | err = ubifs_jnl_update(c, dir, &dentry->d_name, inode, 0, 0); | |
842 | if (err) { | |
235c362b | 843 | ubifs_err(c, "cannot create directory, error %d", err); |
1e51764a AB |
844 | goto out_cancel; |
845 | } | |
846 | mutex_unlock(&dir_ui->ui_mutex); | |
847 | ||
848 | ubifs_release_budget(c, &req); | |
849 | d_instantiate(dentry, inode); | |
850 | return 0; | |
851 | ||
852 | out_cancel: | |
853 | dir->i_size -= sz_change; | |
854 | dir_ui->ui_size = dir->i_size; | |
855 | drop_nlink(dir); | |
856 | mutex_unlock(&dir_ui->ui_mutex); | |
9401a795 | 857 | out_inode: |
1e51764a AB |
858 | make_bad_inode(inode); |
859 | iput(inode); | |
860 | out_budg: | |
861 | ubifs_release_budget(c, &req); | |
862 | return err; | |
863 | } | |
864 | ||
865 | static int ubifs_mknod(struct inode *dir, struct dentry *dentry, | |
1a67aafb | 866 | umode_t mode, dev_t rdev) |
1e51764a AB |
867 | { |
868 | struct inode *inode; | |
869 | struct ubifs_inode *ui; | |
870 | struct ubifs_inode *dir_ui = ubifs_inode(dir); | |
871 | struct ubifs_info *c = dir->i_sb->s_fs_info; | |
872 | union ubifs_dev_desc *dev = NULL; | |
873 | int sz_change = CALC_DENT_SIZE(dentry->d_name.len); | |
874 | int err, devlen = 0; | |
875 | struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1, | |
dab4b4d2 AB |
876 | .new_ino_d = ALIGN(devlen, 8), |
877 | .dirtied_ino = 1 }; | |
1e51764a AB |
878 | |
879 | /* | |
880 | * Budget request settings: new inode, new direntry and changing parent | |
881 | * directory inode. | |
882 | */ | |
883 | ||
4cb2a01d | 884 | dbg_gen("dent '%pd' in dir ino %lu", dentry, dir->i_ino); |
1e51764a | 885 | |
1e51764a AB |
886 | if (S_ISBLK(mode) || S_ISCHR(mode)) { |
887 | dev = kmalloc(sizeof(union ubifs_dev_desc), GFP_NOFS); | |
888 | if (!dev) | |
889 | return -ENOMEM; | |
890 | devlen = ubifs_encode_dev(dev, rdev); | |
891 | } | |
892 | ||
893 | err = ubifs_budget_space(c, &req); | |
894 | if (err) { | |
895 | kfree(dev); | |
896 | return err; | |
897 | } | |
898 | ||
899 | inode = ubifs_new_inode(c, dir, mode); | |
900 | if (IS_ERR(inode)) { | |
901 | kfree(dev); | |
902 | err = PTR_ERR(inode); | |
903 | goto out_budg; | |
904 | } | |
905 | ||
906 | init_special_inode(inode, inode->i_mode, rdev); | |
907 | inode->i_size = ubifs_inode(inode)->ui_size = devlen; | |
908 | ui = ubifs_inode(inode); | |
909 | ui->data = dev; | |
910 | ui->data_len = devlen; | |
911 | ||
d7f0b70d SN |
912 | err = ubifs_init_security(dir, inode, &dentry->d_name); |
913 | if (err) | |
9401a795 | 914 | goto out_inode; |
d7f0b70d | 915 | |
1e51764a AB |
916 | mutex_lock(&dir_ui->ui_mutex); |
917 | dir->i_size += sz_change; | |
918 | dir_ui->ui_size = dir->i_size; | |
919 | dir->i_mtime = dir->i_ctime = inode->i_ctime; | |
920 | err = ubifs_jnl_update(c, dir, &dentry->d_name, inode, 0, 0); | |
921 | if (err) | |
922 | goto out_cancel; | |
923 | mutex_unlock(&dir_ui->ui_mutex); | |
924 | ||
925 | ubifs_release_budget(c, &req); | |
926 | insert_inode_hash(inode); | |
927 | d_instantiate(dentry, inode); | |
928 | return 0; | |
929 | ||
930 | out_cancel: | |
931 | dir->i_size -= sz_change; | |
932 | dir_ui->ui_size = dir->i_size; | |
933 | mutex_unlock(&dir_ui->ui_mutex); | |
9401a795 | 934 | out_inode: |
1e51764a AB |
935 | make_bad_inode(inode); |
936 | iput(inode); | |
937 | out_budg: | |
938 | ubifs_release_budget(c, &req); | |
939 | return err; | |
940 | } | |
941 | ||
942 | static int ubifs_symlink(struct inode *dir, struct dentry *dentry, | |
943 | const char *symname) | |
944 | { | |
945 | struct inode *inode; | |
946 | struct ubifs_inode *ui; | |
947 | struct ubifs_inode *dir_ui = ubifs_inode(dir); | |
948 | struct ubifs_info *c = dir->i_sb->s_fs_info; | |
949 | int err, len = strlen(symname); | |
950 | int sz_change = CALC_DENT_SIZE(dentry->d_name.len); | |
951 | struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1, | |
dab4b4d2 AB |
952 | .new_ino_d = ALIGN(len, 8), |
953 | .dirtied_ino = 1 }; | |
1e51764a AB |
954 | |
955 | /* | |
956 | * Budget request settings: new inode, new direntry and changing parent | |
957 | * directory inode. | |
958 | */ | |
959 | ||
4cb2a01d AV |
960 | dbg_gen("dent '%pd', target '%s' in dir ino %lu", dentry, |
961 | symname, dir->i_ino); | |
1e51764a AB |
962 | |
963 | if (len > UBIFS_MAX_INO_DATA) | |
964 | return -ENAMETOOLONG; | |
965 | ||
966 | err = ubifs_budget_space(c, &req); | |
967 | if (err) | |
968 | return err; | |
969 | ||
970 | inode = ubifs_new_inode(c, dir, S_IFLNK | S_IRWXUGO); | |
971 | if (IS_ERR(inode)) { | |
972 | err = PTR_ERR(inode); | |
973 | goto out_budg; | |
974 | } | |
975 | ||
976 | ui = ubifs_inode(inode); | |
977 | ui->data = kmalloc(len + 1, GFP_NOFS); | |
978 | if (!ui->data) { | |
979 | err = -ENOMEM; | |
980 | goto out_inode; | |
981 | } | |
982 | ||
983 | memcpy(ui->data, symname, len); | |
984 | ((char *)ui->data)[len] = '\0'; | |
0f301bd3 | 985 | inode->i_link = ui->data; |
1e51764a AB |
986 | /* |
987 | * The terminating zero byte is not written to the flash media and it | |
988 | * is put just to make later in-memory string processing simpler. Thus, | |
989 | * data length is @len, not @len + %1. | |
990 | */ | |
991 | ui->data_len = len; | |
992 | inode->i_size = ubifs_inode(inode)->ui_size = len; | |
993 | ||
d7f0b70d SN |
994 | err = ubifs_init_security(dir, inode, &dentry->d_name); |
995 | if (err) | |
9401a795 | 996 | goto out_inode; |
d7f0b70d | 997 | |
1e51764a AB |
998 | mutex_lock(&dir_ui->ui_mutex); |
999 | dir->i_size += sz_change; | |
1000 | dir_ui->ui_size = dir->i_size; | |
1001 | dir->i_mtime = dir->i_ctime = inode->i_ctime; | |
1002 | err = ubifs_jnl_update(c, dir, &dentry->d_name, inode, 0, 0); | |
1003 | if (err) | |
1004 | goto out_cancel; | |
1005 | mutex_unlock(&dir_ui->ui_mutex); | |
1006 | ||
1007 | ubifs_release_budget(c, &req); | |
1008 | insert_inode_hash(inode); | |
1009 | d_instantiate(dentry, inode); | |
1010 | return 0; | |
1011 | ||
1012 | out_cancel: | |
1013 | dir->i_size -= sz_change; | |
1014 | dir_ui->ui_size = dir->i_size; | |
1015 | mutex_unlock(&dir_ui->ui_mutex); | |
1016 | out_inode: | |
1017 | make_bad_inode(inode); | |
1018 | iput(inode); | |
1019 | out_budg: | |
1020 | ubifs_release_budget(c, &req); | |
1021 | return err; | |
1022 | } | |
1023 | ||
1024 | /** | |
9e0a1fff | 1025 | * lock_4_inodes - a wrapper for locking three UBIFS inodes. |
1e51764a AB |
1026 | * @inode1: first inode |
1027 | * @inode2: second inode | |
1028 | * @inode3: third inode | |
9e0a1fff | 1029 | * @inode4: fouth inode |
1e51764a | 1030 | * |
82c1593c | 1031 | * This function is used for 'ubifs_rename()' and @inode1 may be the same as |
9e0a1fff | 1032 | * @inode2 whereas @inode3 and @inode4 may be %NULL. |
82c1593c AB |
1033 | * |
1034 | * We do not implement any tricks to guarantee strict lock ordering, because | |
1035 | * VFS has already done it for us on the @i_mutex. So this is just a simple | |
1036 | * wrapper function. | |
1e51764a | 1037 | */ |
9e0a1fff RW |
1038 | static void lock_4_inodes(struct inode *inode1, struct inode *inode2, |
1039 | struct inode *inode3, struct inode *inode4) | |
1e51764a | 1040 | { |
82c1593c AB |
1041 | mutex_lock_nested(&ubifs_inode(inode1)->ui_mutex, WB_MUTEX_1); |
1042 | if (inode2 != inode1) | |
1043 | mutex_lock_nested(&ubifs_inode(inode2)->ui_mutex, WB_MUTEX_2); | |
1044 | if (inode3) | |
1045 | mutex_lock_nested(&ubifs_inode(inode3)->ui_mutex, WB_MUTEX_3); | |
9e0a1fff RW |
1046 | if (inode4) |
1047 | mutex_lock_nested(&ubifs_inode(inode4)->ui_mutex, WB_MUTEX_4); | |
1e51764a AB |
1048 | } |
1049 | ||
1050 | /** | |
9e0a1fff | 1051 | * unlock_4_inodes - a wrapper for unlocking three UBIFS inodes for rename. |
1e51764a AB |
1052 | * @inode1: first inode |
1053 | * @inode2: second inode | |
1054 | * @inode3: third inode | |
9e0a1fff | 1055 | * @inode4: fouth inode |
1e51764a | 1056 | */ |
9e0a1fff RW |
1057 | static void unlock_4_inodes(struct inode *inode1, struct inode *inode2, |
1058 | struct inode *inode3, struct inode *inode4) | |
1e51764a | 1059 | { |
9e0a1fff RW |
1060 | if (inode4) |
1061 | mutex_unlock(&ubifs_inode(inode4)->ui_mutex); | |
1e51764a AB |
1062 | if (inode3) |
1063 | mutex_unlock(&ubifs_inode(inode3)->ui_mutex); | |
82c1593c AB |
1064 | if (inode1 != inode2) |
1065 | mutex_unlock(&ubifs_inode(inode2)->ui_mutex); | |
1066 | mutex_unlock(&ubifs_inode(inode1)->ui_mutex); | |
1e51764a AB |
1067 | } |
1068 | ||
390975ac RW |
1069 | static int do_rename(struct inode *old_dir, struct dentry *old_dentry, |
1070 | struct inode *new_dir, struct dentry *new_dentry, | |
1071 | unsigned int flags) | |
1e51764a AB |
1072 | { |
1073 | struct ubifs_info *c = old_dir->i_sb->s_fs_info; | |
2b0143b5 DH |
1074 | struct inode *old_inode = d_inode(old_dentry); |
1075 | struct inode *new_inode = d_inode(new_dentry); | |
9e0a1fff | 1076 | struct inode *whiteout = NULL; |
1e51764a | 1077 | struct ubifs_inode *old_inode_ui = ubifs_inode(old_inode); |
9e0a1fff | 1078 | struct ubifs_inode *whiteout_ui = NULL; |
1e51764a AB |
1079 | int err, release, sync = 0, move = (new_dir != old_dir); |
1080 | int is_dir = S_ISDIR(old_inode->i_mode); | |
1081 | int unlink = !!new_inode; | |
1082 | int new_sz = CALC_DENT_SIZE(new_dentry->d_name.len); | |
1083 | int old_sz = CALC_DENT_SIZE(old_dentry->d_name.len); | |
1084 | struct ubifs_budget_req req = { .new_dent = 1, .mod_dent = 1, | |
1085 | .dirtied_ino = 3 }; | |
1086 | struct ubifs_budget_req ino_req = { .dirtied_ino = 1, | |
dab4b4d2 | 1087 | .dirtied_ino_d = ALIGN(old_inode_ui->data_len, 8) }; |
1e51764a | 1088 | struct timespec time; |
782759b9 | 1089 | unsigned int uninitialized_var(saved_nlink); |
1e51764a | 1090 | |
f03b8ad8 MS |
1091 | if (flags & ~RENAME_NOREPLACE) |
1092 | return -EINVAL; | |
1093 | ||
1e51764a AB |
1094 | /* |
1095 | * Budget request settings: deletion direntry, new direntry, removing | |
1096 | * the old inode, and changing old and new parent directory inodes. | |
1097 | * | |
1098 | * However, this operation also marks the target inode as dirty and | |
1099 | * does not write it, so we allocate budget for the target inode | |
1100 | * separately. | |
1101 | */ | |
1102 | ||
9e0a1fff | 1103 | dbg_gen("dent '%pd' ino %lu in dir ino %lu to dent '%pd' in dir ino %lu flags 0x%x", |
4cb2a01d | 1104 | old_dentry, old_inode->i_ino, old_dir->i_ino, |
9e0a1fff RW |
1105 | new_dentry, new_dir->i_ino, flags); |
1106 | ||
82c1593c | 1107 | if (unlink) |
5955102c | 1108 | ubifs_assert(inode_is_locked(new_inode)); |
82c1593c | 1109 | |
1e51764a AB |
1110 | if (unlink && is_dir) { |
1111 | err = check_dir_empty(c, new_inode); | |
1112 | if (err) | |
1113 | return err; | |
1114 | } | |
1115 | ||
1116 | err = ubifs_budget_space(c, &req); | |
1117 | if (err) | |
1118 | return err; | |
1119 | err = ubifs_budget_space(c, &ino_req); | |
1120 | if (err) { | |
1121 | ubifs_release_budget(c, &req); | |
1122 | return err; | |
1123 | } | |
1124 | ||
9e0a1fff RW |
1125 | if (flags & RENAME_WHITEOUT) { |
1126 | union ubifs_dev_desc *dev = NULL; | |
1127 | ||
1128 | dev = kmalloc(sizeof(union ubifs_dev_desc), GFP_NOFS); | |
1129 | if (!dev) { | |
1130 | ubifs_release_budget(c, &req); | |
1131 | ubifs_release_budget(c, &ino_req); | |
1132 | return -ENOMEM; | |
1133 | } | |
1134 | ||
1135 | err = do_tmpfile(old_dir, old_dentry, S_IFCHR | WHITEOUT_MODE, &whiteout); | |
1136 | if (err) { | |
1137 | ubifs_release_budget(c, &req); | |
1138 | ubifs_release_budget(c, &ino_req); | |
1139 | kfree(dev); | |
1140 | return err; | |
1141 | } | |
1142 | ||
1143 | whiteout->i_state |= I_LINKABLE; | |
1144 | whiteout_ui = ubifs_inode(whiteout); | |
1145 | whiteout_ui->data = dev; | |
1146 | whiteout_ui->data_len = ubifs_encode_dev(dev, MKDEV(0, 0)); | |
1147 | ubifs_assert(!whiteout_ui->dirty); | |
1148 | } | |
1149 | ||
1150 | lock_4_inodes(old_dir, new_dir, new_inode, whiteout); | |
1e51764a AB |
1151 | |
1152 | /* | |
1153 | * Like most other Unix systems, set the @i_ctime for inodes on a | |
1154 | * rename. | |
1155 | */ | |
1156 | time = ubifs_current_time(old_dir); | |
1157 | old_inode->i_ctime = time; | |
1158 | ||
1159 | /* We must adjust parent link count when renaming directories */ | |
1160 | if (is_dir) { | |
1161 | if (move) { | |
1162 | /* | |
1163 | * @old_dir loses a link because we are moving | |
1164 | * @old_inode to a different directory. | |
1165 | */ | |
1166 | drop_nlink(old_dir); | |
1167 | /* | |
1168 | * @new_dir only gains a link if we are not also | |
1169 | * overwriting an existing directory. | |
1170 | */ | |
1171 | if (!unlink) | |
1172 | inc_nlink(new_dir); | |
1173 | } else { | |
1174 | /* | |
1175 | * @old_inode is not moving to a different directory, | |
1176 | * but @old_dir still loses a link if we are | |
1177 | * overwriting an existing directory. | |
1178 | */ | |
1179 | if (unlink) | |
1180 | drop_nlink(old_dir); | |
1181 | } | |
1182 | } | |
1183 | ||
1184 | old_dir->i_size -= old_sz; | |
1185 | ubifs_inode(old_dir)->ui_size = old_dir->i_size; | |
1186 | old_dir->i_mtime = old_dir->i_ctime = time; | |
1187 | new_dir->i_mtime = new_dir->i_ctime = time; | |
1188 | ||
1189 | /* | |
1190 | * And finally, if we unlinked a direntry which happened to have the | |
1191 | * same name as the moved direntry, we have to decrement @i_nlink of | |
1192 | * the unlinked inode and change its ctime. | |
1193 | */ | |
1194 | if (unlink) { | |
1195 | /* | |
1196 | * Directories cannot have hard-links, so if this is a | |
c43be108 | 1197 | * directory, just clear @i_nlink. |
1e51764a | 1198 | */ |
c43be108 | 1199 | saved_nlink = new_inode->i_nlink; |
1e51764a | 1200 | if (is_dir) |
c43be108 AB |
1201 | clear_nlink(new_inode); |
1202 | else | |
1e51764a AB |
1203 | drop_nlink(new_inode); |
1204 | new_inode->i_ctime = time; | |
1e51764a AB |
1205 | } else { |
1206 | new_dir->i_size += new_sz; | |
1207 | ubifs_inode(new_dir)->ui_size = new_dir->i_size; | |
1208 | } | |
1209 | ||
1210 | /* | |
1211 | * Do not ask 'ubifs_jnl_rename()' to flush write-buffer if @old_inode | |
1212 | * is dirty, because this will be done later on at the end of | |
1213 | * 'ubifs_rename()'. | |
1214 | */ | |
1215 | if (IS_SYNC(old_inode)) { | |
1216 | sync = IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir); | |
1217 | if (unlink && IS_SYNC(new_inode)) | |
1218 | sync = 1; | |
1219 | } | |
9e0a1fff RW |
1220 | |
1221 | if (whiteout) { | |
1222 | struct ubifs_budget_req wht_req = { .dirtied_ino = 1, | |
1223 | .dirtied_ino_d = \ | |
1224 | ALIGN(ubifs_inode(whiteout)->data_len, 8) }; | |
1225 | ||
1226 | err = ubifs_budget_space(c, &wht_req); | |
1227 | if (err) { | |
1228 | ubifs_release_budget(c, &req); | |
1229 | ubifs_release_budget(c, &ino_req); | |
1230 | kfree(whiteout_ui->data); | |
1231 | whiteout_ui->data_len = 0; | |
1232 | iput(whiteout); | |
1233 | return err; | |
1234 | } | |
1235 | ||
1236 | inc_nlink(whiteout); | |
1237 | mark_inode_dirty(whiteout); | |
1238 | whiteout->i_state &= ~I_LINKABLE; | |
1239 | iput(whiteout); | |
1240 | } | |
1241 | ||
1242 | err = ubifs_jnl_rename(c, old_dir, old_dentry, new_dir, new_dentry, whiteout, | |
1e51764a AB |
1243 | sync); |
1244 | if (err) | |
1245 | goto out_cancel; | |
1246 | ||
9e0a1fff | 1247 | unlock_4_inodes(old_dir, new_dir, new_inode, whiteout); |
1e51764a AB |
1248 | ubifs_release_budget(c, &req); |
1249 | ||
1250 | mutex_lock(&old_inode_ui->ui_mutex); | |
1251 | release = old_inode_ui->dirty; | |
1252 | mark_inode_dirty_sync(old_inode); | |
1253 | mutex_unlock(&old_inode_ui->ui_mutex); | |
1254 | ||
1255 | if (release) | |
1256 | ubifs_release_budget(c, &ino_req); | |
1257 | if (IS_SYNC(old_inode)) | |
a9185b41 | 1258 | err = old_inode->i_sb->s_op->write_inode(old_inode, NULL); |
1e51764a AB |
1259 | return err; |
1260 | ||
1261 | out_cancel: | |
1262 | if (unlink) { | |
c43be108 | 1263 | set_nlink(new_inode, saved_nlink); |
1e51764a AB |
1264 | } else { |
1265 | new_dir->i_size -= new_sz; | |
1266 | ubifs_inode(new_dir)->ui_size = new_dir->i_size; | |
1267 | } | |
1268 | old_dir->i_size += old_sz; | |
1269 | ubifs_inode(old_dir)->ui_size = old_dir->i_size; | |
1270 | if (is_dir) { | |
1271 | if (move) { | |
1272 | inc_nlink(old_dir); | |
1273 | if (!unlink) | |
1274 | drop_nlink(new_dir); | |
1275 | } else { | |
1276 | if (unlink) | |
1277 | inc_nlink(old_dir); | |
1278 | } | |
1279 | } | |
9e0a1fff RW |
1280 | if (whiteout) { |
1281 | drop_nlink(whiteout); | |
1282 | iput(whiteout); | |
1283 | } | |
1284 | unlock_4_inodes(old_dir, new_dir, new_inode, whiteout); | |
1e51764a AB |
1285 | ubifs_release_budget(c, &ino_req); |
1286 | ubifs_release_budget(c, &req); | |
1287 | return err; | |
1288 | } | |
1289 | ||
9ec64962 RW |
1290 | static int ubifs_xrename(struct inode *old_dir, struct dentry *old_dentry, |
1291 | struct inode *new_dir, struct dentry *new_dentry) | |
1292 | { | |
1293 | struct ubifs_info *c = old_dir->i_sb->s_fs_info; | |
1294 | struct ubifs_budget_req req = { .new_dent = 1, .mod_dent = 1, | |
1295 | .dirtied_ino = 2 }; | |
1296 | int sync = IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir); | |
1297 | struct inode *fst_inode = d_inode(old_dentry); | |
1298 | struct inode *snd_inode = d_inode(new_dentry); | |
1299 | struct timespec time; | |
1300 | int err; | |
1301 | ||
1302 | ubifs_assert(fst_inode && snd_inode); | |
1303 | ||
1304 | lock_4_inodes(old_dir, new_dir, NULL, NULL); | |
1305 | ||
1306 | time = ubifs_current_time(old_dir); | |
1307 | fst_inode->i_ctime = time; | |
1308 | snd_inode->i_ctime = time; | |
1309 | old_dir->i_mtime = old_dir->i_ctime = time; | |
1310 | new_dir->i_mtime = new_dir->i_ctime = time; | |
1311 | ||
1312 | if (old_dir != new_dir) { | |
1313 | if (S_ISDIR(fst_inode->i_mode) && !S_ISDIR(snd_inode->i_mode)) { | |
1314 | inc_nlink(new_dir); | |
1315 | drop_nlink(old_dir); | |
1316 | } | |
1317 | else if (!S_ISDIR(fst_inode->i_mode) && S_ISDIR(snd_inode->i_mode)) { | |
1318 | drop_nlink(new_dir); | |
1319 | inc_nlink(old_dir); | |
1320 | } | |
1321 | } | |
1322 | ||
1323 | err = ubifs_jnl_xrename(c, old_dir, old_dentry, new_dir, new_dentry, | |
1324 | sync); | |
1325 | ||
1326 | unlock_4_inodes(old_dir, new_dir, NULL, NULL); | |
1327 | ubifs_release_budget(c, &req); | |
1328 | ||
1329 | return err; | |
1330 | } | |
1331 | ||
390975ac | 1332 | static int ubifs_rename(struct inode *old_dir, struct dentry *old_dentry, |
9ec64962 RW |
1333 | struct inode *new_dir, struct dentry *new_dentry, |
1334 | unsigned int flags) | |
1335 | { | |
1336 | if (flags & ~(RENAME_NOREPLACE | RENAME_WHITEOUT | RENAME_EXCHANGE)) | |
1337 | return -EINVAL; | |
1338 | ||
1339 | ubifs_assert(inode_is_locked(old_dir)); | |
1340 | ubifs_assert(inode_is_locked(new_dir)); | |
1341 | ||
1342 | if (flags & RENAME_EXCHANGE) | |
1343 | return ubifs_xrename(old_dir, old_dentry, new_dir, new_dentry); | |
1344 | ||
390975ac | 1345 | return do_rename(old_dir, old_dentry, new_dir, new_dentry, flags); |
9ec64962 RW |
1346 | } |
1347 | ||
1e51764a AB |
1348 | int ubifs_getattr(struct vfsmount *mnt, struct dentry *dentry, |
1349 | struct kstat *stat) | |
1350 | { | |
1351 | loff_t size; | |
2b0143b5 | 1352 | struct inode *inode = d_inode(dentry); |
1e51764a AB |
1353 | struct ubifs_inode *ui = ubifs_inode(inode); |
1354 | ||
1355 | mutex_lock(&ui->ui_mutex); | |
6d42e7e9 | 1356 | generic_fillattr(inode, stat); |
1e51764a AB |
1357 | stat->blksize = UBIFS_BLOCK_SIZE; |
1358 | stat->size = ui->ui_size; | |
1359 | ||
1360 | /* | |
1361 | * Unfortunately, the 'stat()' system call was designed for block | |
1362 | * device based file systems, and it is not appropriate for UBIFS, | |
1363 | * because UBIFS does not have notion of "block". For example, it is | |
1364 | * difficult to tell how many block a directory takes - it actually | |
1365 | * takes less than 300 bytes, but we have to round it to block size, | |
1366 | * which introduces large mistake. This makes utilities like 'du' to | |
1367 | * report completely senseless numbers. This is the reason why UBIFS | |
1368 | * goes the same way as JFFS2 - it reports zero blocks for everything | |
1369 | * but regular files, which makes more sense than reporting completely | |
1370 | * wrong sizes. | |
1371 | */ | |
1372 | if (S_ISREG(inode->i_mode)) { | |
1373 | size = ui->xattr_size; | |
1374 | size += stat->size; | |
1375 | size = ALIGN(size, UBIFS_BLOCK_SIZE); | |
1376 | /* | |
1377 | * Note, user-space expects 512-byte blocks count irrespectively | |
1378 | * of what was reported in @stat->size. | |
1379 | */ | |
1380 | stat->blocks = size >> 9; | |
1381 | } else | |
1382 | stat->blocks = 0; | |
1383 | mutex_unlock(&ui->ui_mutex); | |
1384 | return 0; | |
1385 | } | |
1386 | ||
e8b81566 | 1387 | const struct inode_operations ubifs_dir_inode_operations = { |
1e51764a AB |
1388 | .lookup = ubifs_lookup, |
1389 | .create = ubifs_create, | |
1390 | .link = ubifs_link, | |
1391 | .symlink = ubifs_symlink, | |
1392 | .unlink = ubifs_unlink, | |
1393 | .mkdir = ubifs_mkdir, | |
1394 | .rmdir = ubifs_rmdir, | |
1395 | .mknod = ubifs_mknod, | |
390975ac | 1396 | .rename = ubifs_rename, |
1e51764a AB |
1397 | .setattr = ubifs_setattr, |
1398 | .getattr = ubifs_getattr, | |
1e51764a | 1399 | .listxattr = ubifs_listxattr, |
8c1c5f26 DY |
1400 | #ifdef CONFIG_UBIFS_ATIME_SUPPORT |
1401 | .update_time = ubifs_update_time, | |
1402 | #endif | |
474b9370 | 1403 | .tmpfile = ubifs_tmpfile, |
1e51764a AB |
1404 | }; |
1405 | ||
e8b81566 | 1406 | const struct file_operations ubifs_dir_operations = { |
01122e06 | 1407 | .llseek = generic_file_llseek, |
1e51764a AB |
1408 | .release = ubifs_dir_release, |
1409 | .read = generic_read_dir, | |
c51da20c | 1410 | .iterate_shared = ubifs_readdir, |
1e51764a AB |
1411 | .fsync = ubifs_fsync, |
1412 | .unlocked_ioctl = ubifs_ioctl, | |
1413 | #ifdef CONFIG_COMPAT | |
1414 | .compat_ioctl = ubifs_compat_ioctl, | |
1415 | #endif | |
1416 | }; |