Commit | Line | Data |
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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 | */ | |
d475a507 | 88 | struct inode *ubifs_new_inode(struct ubifs_info *c, struct inode *dir, |
ad44be5c | 89 | umode_t mode) |
1e51764a | 90 | { |
d475a507 | 91 | int err; |
1e51764a AB |
92 | struct inode *inode; |
93 | struct ubifs_inode *ui; | |
d475a507 RW |
94 | bool encrypted = false; |
95 | ||
96 | if (ubifs_crypt_is_encrypted(dir)) { | |
97 | err = fscrypt_get_encryption_info(dir); | |
98 | if (err) { | |
99 | ubifs_err(c, "fscrypt_get_encryption_info failed: %i", err); | |
100 | return ERR_PTR(err); | |
101 | } | |
102 | ||
103 | if (!fscrypt_has_encryption_key(dir)) | |
104 | return ERR_PTR(-EPERM); | |
105 | ||
106 | encrypted = true; | |
107 | } | |
1e51764a AB |
108 | |
109 | inode = new_inode(c->vfs_sb); | |
110 | ui = ubifs_inode(inode); | |
111 | if (!inode) | |
112 | return ERR_PTR(-ENOMEM); | |
113 | ||
114 | /* | |
115 | * Set 'S_NOCMTIME' to prevent VFS form updating [mc]time of inodes and | |
116 | * marking them dirty in file write path (see 'file_update_time()'). | |
117 | * UBIFS has to fully control "clean <-> dirty" transitions of inodes | |
118 | * to make budgeting work. | |
119 | */ | |
12e776a0 | 120 | inode->i_flags |= S_NOCMTIME; |
1e51764a | 121 | |
abf5d08a | 122 | inode_init_owner(inode, dir, mode); |
1e51764a | 123 | inode->i_mtime = inode->i_atime = inode->i_ctime = |
607a11ad | 124 | current_time(inode); |
1e51764a | 125 | inode->i_mapping->nrpages = 0; |
1e51764a AB |
126 | |
127 | switch (mode & S_IFMT) { | |
128 | case S_IFREG: | |
129 | inode->i_mapping->a_ops = &ubifs_file_address_operations; | |
130 | inode->i_op = &ubifs_file_inode_operations; | |
131 | inode->i_fop = &ubifs_file_operations; | |
132 | break; | |
133 | case S_IFDIR: | |
134 | inode->i_op = &ubifs_dir_inode_operations; | |
135 | inode->i_fop = &ubifs_dir_operations; | |
136 | inode->i_size = ui->ui_size = UBIFS_INO_NODE_SZ; | |
137 | break; | |
138 | case S_IFLNK: | |
139 | inode->i_op = &ubifs_symlink_inode_operations; | |
140 | break; | |
141 | case S_IFSOCK: | |
142 | case S_IFIFO: | |
143 | case S_IFBLK: | |
144 | case S_IFCHR: | |
145 | inode->i_op = &ubifs_file_inode_operations; | |
f34e87f5 | 146 | encrypted = false; |
1e51764a AB |
147 | break; |
148 | default: | |
149 | BUG(); | |
150 | } | |
151 | ||
152 | ui->flags = inherit_flags(dir, mode); | |
153 | ubifs_set_inode_flags(inode); | |
154 | if (S_ISREG(mode)) | |
155 | ui->compr_type = c->default_compr; | |
156 | else | |
157 | ui->compr_type = UBIFS_COMPR_NONE; | |
158 | ui->synced_i_size = 0; | |
159 | ||
160 | spin_lock(&c->cnt_lock); | |
161 | /* Inode number overflow is currently not supported */ | |
162 | if (c->highest_inum >= INUM_WARN_WATERMARK) { | |
163 | if (c->highest_inum >= INUM_WATERMARK) { | |
164 | spin_unlock(&c->cnt_lock); | |
235c362b | 165 | ubifs_err(c, "out of inode numbers"); |
1e51764a AB |
166 | make_bad_inode(inode); |
167 | iput(inode); | |
168 | return ERR_PTR(-EINVAL); | |
169 | } | |
1a7e985d | 170 | ubifs_warn(c, "running out of inode numbers (current %lu, max %u)", |
e84461ad | 171 | (unsigned long)c->highest_inum, INUM_WATERMARK); |
1e51764a AB |
172 | } |
173 | ||
174 | inode->i_ino = ++c->highest_inum; | |
1e51764a AB |
175 | /* |
176 | * The creation sequence number remains with this inode for its | |
177 | * lifetime. All nodes for this inode have a greater sequence number, | |
178 | * and so it is possible to distinguish obsolete nodes belonging to a | |
179 | * previous incarnation of the same inode number - for example, for the | |
180 | * purpose of rebuilding the index. | |
181 | */ | |
182 | ui->creat_sqnum = ++c->max_sqnum; | |
183 | spin_unlock(&c->cnt_lock); | |
d475a507 RW |
184 | |
185 | if (encrypted) { | |
186 | err = fscrypt_inherit_context(dir, inode, &encrypted, true); | |
187 | if (err) { | |
188 | ubifs_err(c, "fscrypt_inherit_context failed: %i", err); | |
189 | make_bad_inode(inode); | |
190 | iput(inode); | |
191 | return ERR_PTR(err); | |
192 | } | |
193 | } | |
194 | ||
1e51764a AB |
195 | return inode; |
196 | } | |
197 | ||
bb2615d4 AB |
198 | static int dbg_check_name(const struct ubifs_info *c, |
199 | const struct ubifs_dent_node *dent, | |
f4f61d2c | 200 | const struct fscrypt_name *nm) |
1e51764a | 201 | { |
2b1844a8 | 202 | if (!dbg_is_chk_gen(c)) |
1e51764a | 203 | return 0; |
f4f61d2c | 204 | if (le16_to_cpu(dent->nlen) != fname_len(nm)) |
1e51764a | 205 | return -EINVAL; |
f4f61d2c | 206 | if (memcmp(dent->name, fname_name(nm), fname_len(nm))) |
1e51764a AB |
207 | return -EINVAL; |
208 | return 0; | |
209 | } | |
210 | ||
1e51764a | 211 | static struct dentry *ubifs_lookup(struct inode *dir, struct dentry *dentry, |
00cd8dd3 | 212 | unsigned int flags) |
1e51764a AB |
213 | { |
214 | int err; | |
215 | union ubifs_key key; | |
216 | struct inode *inode = NULL; | |
191ac107 | 217 | struct ubifs_dent_node *dent = NULL; |
1e51764a | 218 | struct ubifs_info *c = dir->i_sb->s_fs_info; |
f4f61d2c | 219 | struct fscrypt_name nm; |
1e51764a | 220 | |
4cb2a01d | 221 | dbg_gen("'%pd' in dir ino %lu", dentry, dir->i_ino); |
1e51764a | 222 | |
a0b3ccd9 EB |
223 | err = fscrypt_prepare_lookup(dir, dentry, flags); |
224 | if (err) | |
225 | return ERR_PTR(err); | |
9270b2f4 | 226 | |
f4f61d2c RW |
227 | err = fscrypt_setup_filename(dir, &dentry->d_name, 1, &nm); |
228 | if (err) | |
229 | return ERR_PTR(err); | |
230 | ||
231 | if (fname_len(&nm) > UBIFS_MAX_NLEN) { | |
191ac107 AV |
232 | inode = ERR_PTR(-ENAMETOOLONG); |
233 | goto done; | |
f4f61d2c | 234 | } |
1e51764a AB |
235 | |
236 | dent = kmalloc(UBIFS_MAX_DENT_NODE_SZ, GFP_NOFS); | |
f4f61d2c | 237 | if (!dent) { |
191ac107 AV |
238 | inode = ERR_PTR(-ENOMEM); |
239 | goto done; | |
f4f61d2c | 240 | } |
1e51764a | 241 | |
f4f61d2c | 242 | if (nm.hash) { |
6eb61d58 RW |
243 | ubifs_assert(c, fname_len(&nm) == 0); |
244 | ubifs_assert(c, fname_name(&nm) == NULL); | |
f4f61d2c | 245 | dent_key_init_hash(c, &key, dir->i_ino, nm.hash); |
528e3d17 | 246 | err = ubifs_tnc_lookup_dh(c, &key, dent, nm.minor_hash); |
f4f61d2c RW |
247 | } else { |
248 | dent_key_init(c, &key, dir->i_ino, &nm); | |
249 | err = ubifs_tnc_lookup_nm(c, &key, dent, &nm); | |
250 | } | |
1e51764a | 251 | |
1e51764a | 252 | if (err) { |
191ac107 | 253 | if (err == -ENOENT) |
1e51764a | 254 | dbg_gen("not found"); |
191ac107 AV |
255 | else |
256 | inode = ERR_PTR(err); | |
257 | goto done; | |
1e51764a AB |
258 | } |
259 | ||
f4f61d2c | 260 | if (dbg_check_name(c, dent, &nm)) { |
191ac107 AV |
261 | inode = ERR_PTR(-EINVAL); |
262 | goto done; | |
1e51764a AB |
263 | } |
264 | ||
265 | inode = ubifs_iget(dir->i_sb, le64_to_cpu(dent->inum)); | |
266 | if (IS_ERR(inode)) { | |
267 | /* | |
268 | * This should not happen. Probably the file-system needs | |
269 | * checking. | |
270 | */ | |
271 | err = PTR_ERR(inode); | |
235c362b | 272 | ubifs_err(c, "dead directory entry '%pd', error %d", |
4cb2a01d | 273 | dentry, err); |
1e51764a | 274 | ubifs_ro_mode(c, err); |
191ac107 | 275 | goto done; |
1e51764a AB |
276 | } |
277 | ||
413d5a9e EB |
278 | if (ubifs_crypt_is_encrypted(dir) && |
279 | (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) && | |
280 | !fscrypt_has_permitted_context(dir, inode)) { | |
281 | ubifs_warn(c, "Inconsistent encryption contexts: %lu/%lu", | |
282 | dir->i_ino, inode->i_ino); | |
191ac107 AV |
283 | iput(inode); |
284 | inode = ERR_PTR(-EPERM); | |
413d5a9e EB |
285 | } |
286 | ||
1e51764a AB |
287 | done: |
288 | kfree(dent); | |
f4f61d2c | 289 | fscrypt_free_filename(&nm); |
191ac107 | 290 | return d_splice_alias(inode, dentry); |
1e51764a AB |
291 | } |
292 | ||
4acdaf27 | 293 | static int ubifs_create(struct inode *dir, struct dentry *dentry, umode_t mode, |
ebfc3b49 | 294 | bool excl) |
1e51764a AB |
295 | { |
296 | struct inode *inode; | |
297 | struct ubifs_info *c = dir->i_sb->s_fs_info; | |
1e51764a AB |
298 | struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1, |
299 | .dirtied_ino = 1 }; | |
300 | struct ubifs_inode *dir_ui = ubifs_inode(dir); | |
f4f61d2c RW |
301 | struct fscrypt_name nm; |
302 | int err, sz_change; | |
1e51764a AB |
303 | |
304 | /* | |
305 | * Budget request settings: new inode, new direntry, changing the | |
306 | * parent directory inode. | |
307 | */ | |
308 | ||
4cb2a01d AV |
309 | dbg_gen("dent '%pd', mode %#hx in dir ino %lu", |
310 | dentry, mode, dir->i_ino); | |
1e51764a AB |
311 | |
312 | err = ubifs_budget_space(c, &req); | |
313 | if (err) | |
314 | return err; | |
315 | ||
f4f61d2c RW |
316 | err = fscrypt_setup_filename(dir, &dentry->d_name, 0, &nm); |
317 | if (err) | |
318 | goto out_budg; | |
319 | ||
320 | sz_change = CALC_DENT_SIZE(fname_len(&nm)); | |
321 | ||
1e51764a AB |
322 | inode = ubifs_new_inode(c, dir, mode); |
323 | if (IS_ERR(inode)) { | |
324 | err = PTR_ERR(inode); | |
f4f61d2c | 325 | goto out_fname; |
1e51764a AB |
326 | } |
327 | ||
d7f0b70d SN |
328 | err = ubifs_init_security(dir, inode, &dentry->d_name); |
329 | if (err) | |
9401a795 | 330 | goto out_inode; |
d7f0b70d | 331 | |
1e51764a AB |
332 | mutex_lock(&dir_ui->ui_mutex); |
333 | dir->i_size += sz_change; | |
334 | dir_ui->ui_size = dir->i_size; | |
335 | dir->i_mtime = dir->i_ctime = inode->i_ctime; | |
f4f61d2c | 336 | err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0); |
1e51764a AB |
337 | if (err) |
338 | goto out_cancel; | |
339 | mutex_unlock(&dir_ui->ui_mutex); | |
340 | ||
341 | ubifs_release_budget(c, &req); | |
f4f61d2c | 342 | fscrypt_free_filename(&nm); |
1e51764a AB |
343 | insert_inode_hash(inode); |
344 | d_instantiate(dentry, inode); | |
345 | return 0; | |
346 | ||
347 | out_cancel: | |
348 | dir->i_size -= sz_change; | |
349 | dir_ui->ui_size = dir->i_size; | |
350 | mutex_unlock(&dir_ui->ui_mutex); | |
9401a795 | 351 | out_inode: |
1e51764a AB |
352 | make_bad_inode(inode); |
353 | iput(inode); | |
f4f61d2c RW |
354 | out_fname: |
355 | fscrypt_free_filename(&nm); | |
1e51764a AB |
356 | out_budg: |
357 | ubifs_release_budget(c, &req); | |
235c362b | 358 | ubifs_err(c, "cannot create regular file, error %d", err); |
1e51764a AB |
359 | return err; |
360 | } | |
361 | ||
9e0a1fff RW |
362 | static int do_tmpfile(struct inode *dir, struct dentry *dentry, |
363 | umode_t mode, struct inode **whiteout) | |
474b9370 RW |
364 | { |
365 | struct inode *inode; | |
366 | struct ubifs_info *c = dir->i_sb->s_fs_info; | |
367 | struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1}; | |
368 | struct ubifs_budget_req ino_req = { .dirtied_ino = 1 }; | |
369 | struct ubifs_inode *ui, *dir_ui = ubifs_inode(dir); | |
370 | int err, instantiated = 0; | |
f4f61d2c | 371 | struct fscrypt_name nm; |
474b9370 RW |
372 | |
373 | /* | |
374 | * Budget request settings: new dirty inode, new direntry, | |
375 | * budget for dirtied inode will be released via writeback. | |
376 | */ | |
377 | ||
378 | dbg_gen("dent '%pd', mode %#hx in dir ino %lu", | |
379 | dentry, mode, dir->i_ino); | |
380 | ||
f4f61d2c | 381 | err = fscrypt_setup_filename(dir, &dentry->d_name, 0, &nm); |
474b9370 RW |
382 | if (err) |
383 | return err; | |
384 | ||
f4f61d2c RW |
385 | err = ubifs_budget_space(c, &req); |
386 | if (err) { | |
387 | fscrypt_free_filename(&nm); | |
388 | return err; | |
389 | } | |
390 | ||
474b9370 RW |
391 | err = ubifs_budget_space(c, &ino_req); |
392 | if (err) { | |
393 | ubifs_release_budget(c, &req); | |
f4f61d2c | 394 | fscrypt_free_filename(&nm); |
474b9370 RW |
395 | return err; |
396 | } | |
397 | ||
398 | inode = ubifs_new_inode(c, dir, mode); | |
399 | if (IS_ERR(inode)) { | |
400 | err = PTR_ERR(inode); | |
401 | goto out_budg; | |
402 | } | |
403 | ui = ubifs_inode(inode); | |
404 | ||
9e0a1fff RW |
405 | if (whiteout) { |
406 | init_special_inode(inode, inode->i_mode, WHITEOUT_DEV); | |
6eb61d58 | 407 | ubifs_assert(c, inode->i_op == &ubifs_file_inode_operations); |
9e0a1fff RW |
408 | } |
409 | ||
474b9370 RW |
410 | err = ubifs_init_security(dir, inode, &dentry->d_name); |
411 | if (err) | |
412 | goto out_inode; | |
413 | ||
414 | mutex_lock(&ui->ui_mutex); | |
415 | insert_inode_hash(inode); | |
9e0a1fff RW |
416 | |
417 | if (whiteout) { | |
418 | mark_inode_dirty(inode); | |
419 | drop_nlink(inode); | |
420 | *whiteout = inode; | |
421 | } else { | |
422 | d_tmpfile(dentry, inode); | |
423 | } | |
6eb61d58 | 424 | ubifs_assert(c, ui->dirty); |
9e0a1fff | 425 | |
474b9370 RW |
426 | instantiated = 1; |
427 | mutex_unlock(&ui->ui_mutex); | |
428 | ||
429 | mutex_lock(&dir_ui->ui_mutex); | |
f4f61d2c | 430 | err = ubifs_jnl_update(c, dir, &nm, inode, 1, 0); |
474b9370 RW |
431 | if (err) |
432 | goto out_cancel; | |
433 | mutex_unlock(&dir_ui->ui_mutex); | |
434 | ||
435 | ubifs_release_budget(c, &req); | |
436 | ||
437 | return 0; | |
438 | ||
439 | out_cancel: | |
440 | mutex_unlock(&dir_ui->ui_mutex); | |
441 | out_inode: | |
442 | make_bad_inode(inode); | |
443 | if (!instantiated) | |
444 | iput(inode); | |
445 | out_budg: | |
446 | ubifs_release_budget(c, &req); | |
447 | if (!instantiated) | |
448 | ubifs_release_budget(c, &ino_req); | |
f4f61d2c | 449 | fscrypt_free_filename(&nm); |
474b9370 RW |
450 | ubifs_err(c, "cannot create temporary file, error %d", err); |
451 | return err; | |
452 | } | |
453 | ||
9e0a1fff RW |
454 | static int ubifs_tmpfile(struct inode *dir, struct dentry *dentry, |
455 | umode_t mode) | |
456 | { | |
457 | return do_tmpfile(dir, dentry, mode, NULL); | |
458 | } | |
459 | ||
1e51764a AB |
460 | /** |
461 | * vfs_dent_type - get VFS directory entry type. | |
462 | * @type: UBIFS directory entry type | |
463 | * | |
464 | * This function converts UBIFS directory entry type into VFS directory entry | |
465 | * type. | |
466 | */ | |
467 | static unsigned int vfs_dent_type(uint8_t type) | |
468 | { | |
469 | switch (type) { | |
470 | case UBIFS_ITYPE_REG: | |
471 | return DT_REG; | |
472 | case UBIFS_ITYPE_DIR: | |
473 | return DT_DIR; | |
474 | case UBIFS_ITYPE_LNK: | |
475 | return DT_LNK; | |
476 | case UBIFS_ITYPE_BLK: | |
477 | return DT_BLK; | |
478 | case UBIFS_ITYPE_CHR: | |
479 | return DT_CHR; | |
480 | case UBIFS_ITYPE_FIFO: | |
481 | return DT_FIFO; | |
482 | case UBIFS_ITYPE_SOCK: | |
483 | return DT_SOCK; | |
484 | default: | |
485 | BUG(); | |
486 | } | |
487 | return 0; | |
488 | } | |
489 | ||
490 | /* | |
491 | * The classical Unix view for directory is that it is a linear array of | |
492 | * (name, inode number) entries. Linux/VFS assumes this model as well. | |
493 | * Particularly, 'readdir()' call wants us to return a directory entry offset | |
494 | * which later may be used to continue 'readdir()'ing the directory or to | |
495 | * 'seek()' to that specific direntry. Obviously UBIFS does not really fit this | |
496 | * model because directory entries are identified by keys, which may collide. | |
497 | * | |
498 | * UBIFS uses directory entry hash value for directory offsets, so | |
499 | * 'seekdir()'/'telldir()' may not always work because of possible key | |
500 | * collisions. But UBIFS guarantees that consecutive 'readdir()' calls work | |
501 | * properly by means of saving full directory entry name in the private field | |
502 | * of the file description object. | |
503 | * | |
504 | * This means that UBIFS cannot support NFS which requires full | |
505 | * 'seekdir()'/'telldir()' support. | |
506 | */ | |
01122e06 | 507 | static int ubifs_readdir(struct file *file, struct dir_context *ctx) |
1e51764a | 508 | { |
ba75d570 | 509 | int fstr_real_len = 0, err = 0; |
f4f61d2c RW |
510 | struct fscrypt_name nm; |
511 | struct fscrypt_str fstr = {0}; | |
1e51764a AB |
512 | union ubifs_key key; |
513 | struct ubifs_dent_node *dent; | |
496ad9aa | 514 | struct inode *dir = file_inode(file); |
1e51764a | 515 | struct ubifs_info *c = dir->i_sb->s_fs_info; |
f4f61d2c | 516 | bool encrypted = ubifs_crypt_is_encrypted(dir); |
1e51764a | 517 | |
01122e06 | 518 | dbg_gen("dir ino %lu, f_pos %#llx", dir->i_ino, ctx->pos); |
1e51764a | 519 | |
01122e06 | 520 | if (ctx->pos > UBIFS_S_KEY_HASH_MASK || ctx->pos == 2) |
1e51764a AB |
521 | /* |
522 | * The directory was seek'ed to a senseless position or there | |
523 | * are no more entries. | |
524 | */ | |
525 | return 0; | |
526 | ||
f4f61d2c RW |
527 | if (encrypted) { |
528 | err = fscrypt_get_encryption_info(dir); | |
529 | if (err && err != -ENOKEY) | |
530 | return err; | |
531 | ||
532 | err = fscrypt_fname_alloc_buffer(dir, UBIFS_MAX_NLEN, &fstr); | |
533 | if (err) | |
534 | return err; | |
535 | ||
536 | fstr_real_len = fstr.len; | |
537 | } | |
538 | ||
605c912b AB |
539 | if (file->f_version == 0) { |
540 | /* | |
541 | * The file was seek'ed, which means that @file->private_data | |
542 | * is now invalid. This may also be just the first | |
543 | * 'ubifs_readdir()' invocation, in which case | |
544 | * @file->private_data is NULL, and the below code is | |
545 | * basically a no-op. | |
546 | */ | |
547 | kfree(file->private_data); | |
548 | file->private_data = NULL; | |
549 | } | |
550 | ||
551 | /* | |
552 | * 'generic_file_llseek()' unconditionally sets @file->f_version to | |
553 | * zero, and we use this for detecting whether the file was seek'ed. | |
554 | */ | |
555 | file->f_version = 1; | |
556 | ||
1e51764a | 557 | /* File positions 0 and 1 correspond to "." and ".." */ |
01122e06 | 558 | if (ctx->pos < 2) { |
6eb61d58 | 559 | ubifs_assert(c, !file->private_data); |
f4f61d2c RW |
560 | if (!dir_emit_dots(file, ctx)) { |
561 | if (encrypted) | |
562 | fscrypt_fname_free_buffer(&fstr); | |
1e51764a | 563 | return 0; |
f4f61d2c | 564 | } |
1e51764a AB |
565 | |
566 | /* Find the first entry in TNC and save it */ | |
567 | lowest_dent_key(c, &key, dir->i_ino); | |
f4f61d2c | 568 | fname_len(&nm) = 0; |
1e51764a AB |
569 | dent = ubifs_tnc_next_ent(c, &key, &nm); |
570 | if (IS_ERR(dent)) { | |
571 | err = PTR_ERR(dent); | |
572 | goto out; | |
573 | } | |
574 | ||
01122e06 | 575 | ctx->pos = key_hash_flash(c, &dent->key); |
1e51764a AB |
576 | file->private_data = dent; |
577 | } | |
578 | ||
579 | dent = file->private_data; | |
580 | if (!dent) { | |
581 | /* | |
582 | * The directory was seek'ed to and is now readdir'ed. | |
01122e06 | 583 | * Find the entry corresponding to @ctx->pos or the closest one. |
1e51764a | 584 | */ |
01122e06 | 585 | dent_key_init_hash(c, &key, dir->i_ino, ctx->pos); |
f4f61d2c | 586 | fname_len(&nm) = 0; |
1e51764a AB |
587 | dent = ubifs_tnc_next_ent(c, &key, &nm); |
588 | if (IS_ERR(dent)) { | |
589 | err = PTR_ERR(dent); | |
590 | goto out; | |
591 | } | |
01122e06 | 592 | ctx->pos = key_hash_flash(c, &dent->key); |
1e51764a AB |
593 | file->private_data = dent; |
594 | } | |
595 | ||
596 | while (1) { | |
b20e2d99 HL |
597 | dbg_gen("ino %llu, new f_pos %#x", |
598 | (unsigned long long)le64_to_cpu(dent->inum), | |
1e51764a | 599 | key_hash_flash(c, &dent->key)); |
6eb61d58 | 600 | ubifs_assert(c, le64_to_cpu(dent->ch.sqnum) > |
0ecb9529 | 601 | ubifs_inode(dir)->creat_sqnum); |
1e51764a | 602 | |
f4f61d2c RW |
603 | fname_len(&nm) = le16_to_cpu(dent->nlen); |
604 | fname_name(&nm) = dent->name; | |
605 | ||
606 | if (encrypted) { | |
607 | fstr.len = fstr_real_len; | |
608 | ||
528e3d17 RW |
609 | err = fscrypt_fname_disk_to_usr(dir, key_hash_flash(c, |
610 | &dent->key), | |
611 | le32_to_cpu(dent->cookie), | |
612 | &nm.disk_name, &fstr); | |
ca7f85be | 613 | if (err) |
f4f61d2c RW |
614 | goto out; |
615 | } else { | |
616 | fstr.len = fname_len(&nm); | |
617 | fstr.name = fname_name(&nm); | |
618 | } | |
619 | ||
620 | if (!dir_emit(ctx, fstr.name, fstr.len, | |
1e51764a | 621 | le64_to_cpu(dent->inum), |
f4f61d2c RW |
622 | vfs_dent_type(dent->type))) { |
623 | if (encrypted) | |
624 | fscrypt_fname_free_buffer(&fstr); | |
1e51764a | 625 | return 0; |
f4f61d2c | 626 | } |
1e51764a AB |
627 | |
628 | /* Switch to the next entry */ | |
629 | key_read(c, &dent->key, &key); | |
1e51764a AB |
630 | dent = ubifs_tnc_next_ent(c, &key, &nm); |
631 | if (IS_ERR(dent)) { | |
632 | err = PTR_ERR(dent); | |
633 | goto out; | |
634 | } | |
635 | ||
636 | kfree(file->private_data); | |
01122e06 | 637 | ctx->pos = key_hash_flash(c, &dent->key); |
1e51764a AB |
638 | file->private_data = dent; |
639 | cond_resched(); | |
640 | } | |
641 | ||
642 | out: | |
aeeb14f7 RW |
643 | kfree(file->private_data); |
644 | file->private_data = NULL; | |
645 | ||
f4f61d2c RW |
646 | if (encrypted) |
647 | fscrypt_fname_free_buffer(&fstr); | |
648 | ||
c83ed4c9 | 649 | if (err != -ENOENT) |
235c362b | 650 | ubifs_err(c, "cannot find next direntry, error %d", err); |
a00052a2 RW |
651 | else |
652 | /* | |
653 | * -ENOENT is a non-fatal error in this context, the TNC uses | |
654 | * it to indicate that the cursor moved past the current directory | |
655 | * and readdir() has to stop. | |
656 | */ | |
657 | err = 0; | |
658 | ||
1e51764a | 659 | |
605c912b | 660 | /* 2 is a special value indicating that there are no more direntries */ |
01122e06 | 661 | ctx->pos = 2; |
c83ed4c9 | 662 | return err; |
1e51764a AB |
663 | } |
664 | ||
1e51764a AB |
665 | /* Free saved readdir() state when the directory is closed */ |
666 | static int ubifs_dir_release(struct inode *dir, struct file *file) | |
667 | { | |
668 | kfree(file->private_data); | |
669 | file->private_data = NULL; | |
670 | return 0; | |
671 | } | |
672 | ||
673 | /** | |
82c1593c | 674 | * lock_2_inodes - a wrapper for locking two UBIFS inodes. |
1e51764a AB |
675 | * @inode1: first inode |
676 | * @inode2: second inode | |
82c1593c AB |
677 | * |
678 | * We do not implement any tricks to guarantee strict lock ordering, because | |
679 | * VFS has already done it for us on the @i_mutex. So this is just a simple | |
680 | * wrapper function. | |
1e51764a AB |
681 | */ |
682 | static void lock_2_inodes(struct inode *inode1, struct inode *inode2) | |
683 | { | |
82c1593c AB |
684 | mutex_lock_nested(&ubifs_inode(inode1)->ui_mutex, WB_MUTEX_1); |
685 | mutex_lock_nested(&ubifs_inode(inode2)->ui_mutex, WB_MUTEX_2); | |
1e51764a AB |
686 | } |
687 | ||
688 | /** | |
82c1593c | 689 | * unlock_2_inodes - a wrapper for unlocking two UBIFS inodes. |
1e51764a AB |
690 | * @inode1: first inode |
691 | * @inode2: second inode | |
692 | */ | |
693 | static void unlock_2_inodes(struct inode *inode1, struct inode *inode2) | |
694 | { | |
1e51764a | 695 | mutex_unlock(&ubifs_inode(inode2)->ui_mutex); |
82c1593c | 696 | mutex_unlock(&ubifs_inode(inode1)->ui_mutex); |
1e51764a AB |
697 | } |
698 | ||
699 | static int ubifs_link(struct dentry *old_dentry, struct inode *dir, | |
700 | struct dentry *dentry) | |
701 | { | |
702 | struct ubifs_info *c = dir->i_sb->s_fs_info; | |
2b0143b5 | 703 | struct inode *inode = d_inode(old_dentry); |
1e51764a AB |
704 | struct ubifs_inode *ui = ubifs_inode(inode); |
705 | struct ubifs_inode *dir_ui = ubifs_inode(dir); | |
706 | int err, sz_change = CALC_DENT_SIZE(dentry->d_name.len); | |
707 | struct ubifs_budget_req req = { .new_dent = 1, .dirtied_ino = 2, | |
dab4b4d2 | 708 | .dirtied_ino_d = ALIGN(ui->data_len, 8) }; |
f4f61d2c | 709 | struct fscrypt_name nm; |
1e51764a AB |
710 | |
711 | /* | |
712 | * Budget request settings: new direntry, changing the target inode, | |
713 | * changing the parent inode. | |
714 | */ | |
715 | ||
4cb2a01d AV |
716 | dbg_gen("dent '%pd' to ino %lu (nlink %d) in dir ino %lu", |
717 | dentry, inode->i_ino, | |
1e51764a | 718 | inode->i_nlink, dir->i_ino); |
6eb61d58 RW |
719 | ubifs_assert(c, inode_is_locked(dir)); |
720 | ubifs_assert(c, inode_is_locked(inode)); | |
8b3884a8 | 721 | |
5653878c EB |
722 | err = fscrypt_prepare_link(old_dentry, dir, dentry); |
723 | if (err) | |
724 | return err; | |
f4f61d2c RW |
725 | |
726 | err = fscrypt_setup_filename(dir, &dentry->d_name, 0, &nm); | |
1e51764a AB |
727 | if (err) |
728 | return err; | |
729 | ||
f4f61d2c RW |
730 | err = dbg_check_synced_i_size(c, inode); |
731 | if (err) | |
732 | goto out_fname; | |
733 | ||
1e51764a AB |
734 | err = ubifs_budget_space(c, &req); |
735 | if (err) | |
f4f61d2c | 736 | goto out_fname; |
1e51764a AB |
737 | |
738 | lock_2_inodes(dir, inode); | |
32fe905c RW |
739 | |
740 | /* Handle O_TMPFILE corner case, it is allowed to link a O_TMPFILE. */ | |
741 | if (inode->i_nlink == 0) | |
742 | ubifs_delete_orphan(c, inode->i_ino); | |
743 | ||
1e51764a | 744 | inc_nlink(inode); |
7de9c6ee | 745 | ihold(inode); |
607a11ad | 746 | inode->i_ctime = current_time(inode); |
1e51764a AB |
747 | dir->i_size += sz_change; |
748 | dir_ui->ui_size = dir->i_size; | |
749 | dir->i_mtime = dir->i_ctime = inode->i_ctime; | |
f4f61d2c | 750 | err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0); |
1e51764a AB |
751 | if (err) |
752 | goto out_cancel; | |
753 | unlock_2_inodes(dir, inode); | |
754 | ||
755 | ubifs_release_budget(c, &req); | |
756 | d_instantiate(dentry, inode); | |
f4f61d2c | 757 | fscrypt_free_filename(&nm); |
1e51764a AB |
758 | return 0; |
759 | ||
760 | out_cancel: | |
761 | dir->i_size -= sz_change; | |
762 | dir_ui->ui_size = dir->i_size; | |
763 | drop_nlink(inode); | |
32fe905c RW |
764 | if (inode->i_nlink == 0) |
765 | ubifs_add_orphan(c, inode->i_ino); | |
1e51764a AB |
766 | unlock_2_inodes(dir, inode); |
767 | ubifs_release_budget(c, &req); | |
768 | iput(inode); | |
f4f61d2c RW |
769 | out_fname: |
770 | fscrypt_free_filename(&nm); | |
1e51764a AB |
771 | return err; |
772 | } | |
773 | ||
774 | static int ubifs_unlink(struct inode *dir, struct dentry *dentry) | |
775 | { | |
776 | struct ubifs_info *c = dir->i_sb->s_fs_info; | |
2b0143b5 | 777 | struct inode *inode = d_inode(dentry); |
1e51764a | 778 | struct ubifs_inode *dir_ui = ubifs_inode(dir); |
f4f61d2c | 779 | int err, sz_change, budgeted = 1; |
1e51764a | 780 | struct ubifs_budget_req req = { .mod_dent = 1, .dirtied_ino = 2 }; |
c43be108 | 781 | unsigned int saved_nlink = inode->i_nlink; |
f4f61d2c | 782 | struct fscrypt_name nm; |
1e51764a AB |
783 | |
784 | /* | |
785 | * Budget request settings: deletion direntry, deletion inode (+1 for | |
786 | * @dirtied_ino), changing the parent directory inode. If budgeting | |
787 | * fails, go ahead anyway because we have extra space reserved for | |
788 | * deletions. | |
789 | */ | |
790 | ||
4cb2a01d AV |
791 | dbg_gen("dent '%pd' from ino %lu (nlink %d) in dir ino %lu", |
792 | dentry, inode->i_ino, | |
1e51764a | 793 | inode->i_nlink, dir->i_ino); |
f4f61d2c RW |
794 | |
795 | if (ubifs_crypt_is_encrypted(dir)) { | |
796 | err = fscrypt_get_encryption_info(dir); | |
797 | if (err && err != -ENOKEY) | |
798 | return err; | |
799 | } | |
800 | ||
801 | err = fscrypt_setup_filename(dir, &dentry->d_name, 1, &nm); | |
802 | if (err) | |
803 | return err; | |
804 | ||
805 | sz_change = CALC_DENT_SIZE(fname_len(&nm)); | |
806 | ||
6eb61d58 RW |
807 | ubifs_assert(c, inode_is_locked(dir)); |
808 | ubifs_assert(c, inode_is_locked(inode)); | |
d808efb4 | 809 | err = dbg_check_synced_i_size(c, inode); |
1e51764a | 810 | if (err) |
f4f61d2c | 811 | goto out_fname; |
1e51764a AB |
812 | |
813 | err = ubifs_budget_space(c, &req); | |
814 | if (err) { | |
815 | if (err != -ENOSPC) | |
f4f61d2c | 816 | goto out_fname; |
1e51764a AB |
817 | budgeted = 0; |
818 | } | |
819 | ||
820 | lock_2_inodes(dir, inode); | |
607a11ad | 821 | inode->i_ctime = current_time(dir); |
1e51764a AB |
822 | drop_nlink(inode); |
823 | dir->i_size -= sz_change; | |
824 | dir_ui->ui_size = dir->i_size; | |
825 | dir->i_mtime = dir->i_ctime = inode->i_ctime; | |
f4f61d2c | 826 | err = ubifs_jnl_update(c, dir, &nm, inode, 1, 0); |
1e51764a AB |
827 | if (err) |
828 | goto out_cancel; | |
829 | unlock_2_inodes(dir, inode); | |
830 | ||
831 | if (budgeted) | |
832 | ubifs_release_budget(c, &req); | |
833 | else { | |
834 | /* We've deleted something - clean the "no space" flags */ | |
b137545c | 835 | c->bi.nospace = c->bi.nospace_rp = 0; |
1e51764a AB |
836 | smp_wmb(); |
837 | } | |
f4f61d2c | 838 | fscrypt_free_filename(&nm); |
1e51764a AB |
839 | return 0; |
840 | ||
841 | out_cancel: | |
842 | dir->i_size += sz_change; | |
843 | dir_ui->ui_size = dir->i_size; | |
c43be108 | 844 | set_nlink(inode, saved_nlink); |
1e51764a AB |
845 | unlock_2_inodes(dir, inode); |
846 | if (budgeted) | |
847 | ubifs_release_budget(c, &req); | |
f4f61d2c RW |
848 | out_fname: |
849 | fscrypt_free_filename(&nm); | |
1e51764a AB |
850 | return err; |
851 | } | |
852 | ||
853 | /** | |
854 | * check_dir_empty - check if a directory is empty or not. | |
1e51764a AB |
855 | * @dir: VFS inode object of the directory to check |
856 | * | |
857 | * This function checks if directory @dir is empty. Returns zero if the | |
858 | * directory is empty, %-ENOTEMPTY if it is not, and other negative error codes | |
859 | * in case of of errors. | |
860 | */ | |
f6337d84 | 861 | int ubifs_check_dir_empty(struct inode *dir) |
1e51764a | 862 | { |
f6337d84 | 863 | struct ubifs_info *c = dir->i_sb->s_fs_info; |
f4f61d2c | 864 | struct fscrypt_name nm = { 0 }; |
1e51764a AB |
865 | struct ubifs_dent_node *dent; |
866 | union ubifs_key key; | |
867 | int err; | |
868 | ||
869 | lowest_dent_key(c, &key, dir->i_ino); | |
870 | dent = ubifs_tnc_next_ent(c, &key, &nm); | |
871 | if (IS_ERR(dent)) { | |
872 | err = PTR_ERR(dent); | |
873 | if (err == -ENOENT) | |
874 | err = 0; | |
875 | } else { | |
876 | kfree(dent); | |
877 | err = -ENOTEMPTY; | |
878 | } | |
879 | return err; | |
880 | } | |
881 | ||
882 | static int ubifs_rmdir(struct inode *dir, struct dentry *dentry) | |
883 | { | |
884 | struct ubifs_info *c = dir->i_sb->s_fs_info; | |
2b0143b5 | 885 | struct inode *inode = d_inode(dentry); |
f4f61d2c | 886 | int err, sz_change, budgeted = 1; |
1e51764a AB |
887 | struct ubifs_inode *dir_ui = ubifs_inode(dir); |
888 | struct ubifs_budget_req req = { .mod_dent = 1, .dirtied_ino = 2 }; | |
f4f61d2c | 889 | struct fscrypt_name nm; |
1e51764a AB |
890 | |
891 | /* | |
892 | * Budget request settings: deletion direntry, deletion inode and | |
893 | * changing the parent inode. If budgeting fails, go ahead anyway | |
894 | * because we have extra space reserved for deletions. | |
895 | */ | |
896 | ||
4cb2a01d AV |
897 | dbg_gen("directory '%pd', ino %lu in dir ino %lu", dentry, |
898 | inode->i_ino, dir->i_ino); | |
6eb61d58 RW |
899 | ubifs_assert(c, inode_is_locked(dir)); |
900 | ubifs_assert(c, inode_is_locked(inode)); | |
f6337d84 | 901 | err = ubifs_check_dir_empty(d_inode(dentry)); |
1e51764a AB |
902 | if (err) |
903 | return err; | |
904 | ||
f4f61d2c RW |
905 | if (ubifs_crypt_is_encrypted(dir)) { |
906 | err = fscrypt_get_encryption_info(dir); | |
907 | if (err && err != -ENOKEY) | |
908 | return err; | |
909 | } | |
910 | ||
911 | err = fscrypt_setup_filename(dir, &dentry->d_name, 1, &nm); | |
912 | if (err) | |
913 | return err; | |
914 | ||
915 | sz_change = CALC_DENT_SIZE(fname_len(&nm)); | |
916 | ||
1e51764a AB |
917 | err = ubifs_budget_space(c, &req); |
918 | if (err) { | |
919 | if (err != -ENOSPC) | |
f4f61d2c | 920 | goto out_fname; |
1e51764a AB |
921 | budgeted = 0; |
922 | } | |
923 | ||
924 | lock_2_inodes(dir, inode); | |
607a11ad | 925 | inode->i_ctime = current_time(dir); |
1e51764a AB |
926 | clear_nlink(inode); |
927 | drop_nlink(dir); | |
928 | dir->i_size -= sz_change; | |
929 | dir_ui->ui_size = dir->i_size; | |
930 | dir->i_mtime = dir->i_ctime = inode->i_ctime; | |
f4f61d2c | 931 | err = ubifs_jnl_update(c, dir, &nm, inode, 1, 0); |
1e51764a AB |
932 | if (err) |
933 | goto out_cancel; | |
934 | unlock_2_inodes(dir, inode); | |
935 | ||
936 | if (budgeted) | |
937 | ubifs_release_budget(c, &req); | |
938 | else { | |
939 | /* We've deleted something - clean the "no space" flags */ | |
b137545c | 940 | c->bi.nospace = c->bi.nospace_rp = 0; |
1e51764a AB |
941 | smp_wmb(); |
942 | } | |
f4f61d2c | 943 | fscrypt_free_filename(&nm); |
1e51764a AB |
944 | return 0; |
945 | ||
946 | out_cancel: | |
947 | dir->i_size += sz_change; | |
948 | dir_ui->ui_size = dir->i_size; | |
949 | inc_nlink(dir); | |
c43be108 | 950 | set_nlink(inode, 2); |
1e51764a AB |
951 | unlock_2_inodes(dir, inode); |
952 | if (budgeted) | |
953 | ubifs_release_budget(c, &req); | |
f4f61d2c RW |
954 | out_fname: |
955 | fscrypt_free_filename(&nm); | |
1e51764a AB |
956 | return err; |
957 | } | |
958 | ||
18bb1db3 | 959 | static int ubifs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
1e51764a AB |
960 | { |
961 | struct inode *inode; | |
962 | struct ubifs_inode *dir_ui = ubifs_inode(dir); | |
963 | struct ubifs_info *c = dir->i_sb->s_fs_info; | |
f4f61d2c | 964 | int err, sz_change; |
182854b4 | 965 | struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1 }; |
f4f61d2c | 966 | struct fscrypt_name nm; |
1e51764a AB |
967 | |
968 | /* | |
969 | * Budget request settings: new inode, new direntry and changing parent | |
970 | * directory inode. | |
971 | */ | |
972 | ||
4cb2a01d AV |
973 | dbg_gen("dent '%pd', mode %#hx in dir ino %lu", |
974 | dentry, mode, dir->i_ino); | |
1e51764a AB |
975 | |
976 | err = ubifs_budget_space(c, &req); | |
977 | if (err) | |
978 | return err; | |
979 | ||
f4f61d2c RW |
980 | err = fscrypt_setup_filename(dir, &dentry->d_name, 0, &nm); |
981 | if (err) | |
982 | goto out_budg; | |
983 | ||
984 | sz_change = CALC_DENT_SIZE(fname_len(&nm)); | |
985 | ||
1e51764a AB |
986 | inode = ubifs_new_inode(c, dir, S_IFDIR | mode); |
987 | if (IS_ERR(inode)) { | |
988 | err = PTR_ERR(inode); | |
f4f61d2c | 989 | goto out_fname; |
1e51764a AB |
990 | } |
991 | ||
d7f0b70d SN |
992 | err = ubifs_init_security(dir, inode, &dentry->d_name); |
993 | if (err) | |
9401a795 | 994 | goto out_inode; |
d7f0b70d | 995 | |
1e51764a AB |
996 | mutex_lock(&dir_ui->ui_mutex); |
997 | insert_inode_hash(inode); | |
998 | inc_nlink(inode); | |
999 | inc_nlink(dir); | |
1000 | dir->i_size += sz_change; | |
1001 | dir_ui->ui_size = dir->i_size; | |
1002 | dir->i_mtime = dir->i_ctime = inode->i_ctime; | |
f4f61d2c | 1003 | err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0); |
1e51764a | 1004 | if (err) { |
235c362b | 1005 | ubifs_err(c, "cannot create directory, error %d", err); |
1e51764a AB |
1006 | goto out_cancel; |
1007 | } | |
1008 | mutex_unlock(&dir_ui->ui_mutex); | |
1009 | ||
1010 | ubifs_release_budget(c, &req); | |
1011 | d_instantiate(dentry, inode); | |
f4f61d2c | 1012 | fscrypt_free_filename(&nm); |
1e51764a AB |
1013 | return 0; |
1014 | ||
1015 | out_cancel: | |
1016 | dir->i_size -= sz_change; | |
1017 | dir_ui->ui_size = dir->i_size; | |
1018 | drop_nlink(dir); | |
1019 | mutex_unlock(&dir_ui->ui_mutex); | |
9401a795 | 1020 | out_inode: |
1e51764a AB |
1021 | make_bad_inode(inode); |
1022 | iput(inode); | |
f4f61d2c RW |
1023 | out_fname: |
1024 | fscrypt_free_filename(&nm); | |
1e51764a AB |
1025 | out_budg: |
1026 | ubifs_release_budget(c, &req); | |
1027 | return err; | |
1028 | } | |
1029 | ||
1030 | static int ubifs_mknod(struct inode *dir, struct dentry *dentry, | |
1a67aafb | 1031 | umode_t mode, dev_t rdev) |
1e51764a AB |
1032 | { |
1033 | struct inode *inode; | |
1034 | struct ubifs_inode *ui; | |
1035 | struct ubifs_inode *dir_ui = ubifs_inode(dir); | |
1036 | struct ubifs_info *c = dir->i_sb->s_fs_info; | |
1037 | union ubifs_dev_desc *dev = NULL; | |
f4f61d2c | 1038 | int sz_change; |
1e51764a AB |
1039 | int err, devlen = 0; |
1040 | struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1, | |
dab4b4d2 | 1041 | .dirtied_ino = 1 }; |
f4f61d2c | 1042 | struct fscrypt_name nm; |
1e51764a AB |
1043 | |
1044 | /* | |
1045 | * Budget request settings: new inode, new direntry and changing parent | |
1046 | * directory inode. | |
1047 | */ | |
1048 | ||
4cb2a01d | 1049 | dbg_gen("dent '%pd' in dir ino %lu", dentry, dir->i_ino); |
1e51764a | 1050 | |
1e51764a AB |
1051 | if (S_ISBLK(mode) || S_ISCHR(mode)) { |
1052 | dev = kmalloc(sizeof(union ubifs_dev_desc), GFP_NOFS); | |
1053 | if (!dev) | |
1054 | return -ENOMEM; | |
1055 | devlen = ubifs_encode_dev(dev, rdev); | |
1056 | } | |
1057 | ||
4d35ca4f | 1058 | req.new_ino_d = ALIGN(devlen, 8); |
1e51764a AB |
1059 | err = ubifs_budget_space(c, &req); |
1060 | if (err) { | |
1061 | kfree(dev); | |
1062 | return err; | |
1063 | } | |
1064 | ||
f4f61d2c | 1065 | err = fscrypt_setup_filename(dir, &dentry->d_name, 0, &nm); |
63ed6573 RW |
1066 | if (err) { |
1067 | kfree(dev); | |
f4f61d2c | 1068 | goto out_budg; |
63ed6573 | 1069 | } |
f4f61d2c RW |
1070 | |
1071 | sz_change = CALC_DENT_SIZE(fname_len(&nm)); | |
1072 | ||
1e51764a AB |
1073 | inode = ubifs_new_inode(c, dir, mode); |
1074 | if (IS_ERR(inode)) { | |
1075 | kfree(dev); | |
1076 | err = PTR_ERR(inode); | |
f4f61d2c | 1077 | goto out_fname; |
1e51764a AB |
1078 | } |
1079 | ||
1080 | init_special_inode(inode, inode->i_mode, rdev); | |
1081 | inode->i_size = ubifs_inode(inode)->ui_size = devlen; | |
1082 | ui = ubifs_inode(inode); | |
1083 | ui->data = dev; | |
1084 | ui->data_len = devlen; | |
1085 | ||
d7f0b70d SN |
1086 | err = ubifs_init_security(dir, inode, &dentry->d_name); |
1087 | if (err) | |
9401a795 | 1088 | goto out_inode; |
d7f0b70d | 1089 | |
1e51764a AB |
1090 | mutex_lock(&dir_ui->ui_mutex); |
1091 | dir->i_size += sz_change; | |
1092 | dir_ui->ui_size = dir->i_size; | |
1093 | dir->i_mtime = dir->i_ctime = inode->i_ctime; | |
f4f61d2c | 1094 | err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0); |
1e51764a AB |
1095 | if (err) |
1096 | goto out_cancel; | |
1097 | mutex_unlock(&dir_ui->ui_mutex); | |
1098 | ||
1099 | ubifs_release_budget(c, &req); | |
1100 | insert_inode_hash(inode); | |
1101 | d_instantiate(dentry, inode); | |
f4f61d2c | 1102 | fscrypt_free_filename(&nm); |
1e51764a AB |
1103 | return 0; |
1104 | ||
1105 | out_cancel: | |
1106 | dir->i_size -= sz_change; | |
1107 | dir_ui->ui_size = dir->i_size; | |
1108 | mutex_unlock(&dir_ui->ui_mutex); | |
9401a795 | 1109 | out_inode: |
1e51764a AB |
1110 | make_bad_inode(inode); |
1111 | iput(inode); | |
f4f61d2c RW |
1112 | out_fname: |
1113 | fscrypt_free_filename(&nm); | |
1e51764a AB |
1114 | out_budg: |
1115 | ubifs_release_budget(c, &req); | |
1116 | return err; | |
1117 | } | |
1118 | ||
1119 | static int ubifs_symlink(struct inode *dir, struct dentry *dentry, | |
1120 | const char *symname) | |
1121 | { | |
1122 | struct inode *inode; | |
1123 | struct ubifs_inode *ui; | |
1124 | struct ubifs_inode *dir_ui = ubifs_inode(dir); | |
1125 | struct ubifs_info *c = dir->i_sb->s_fs_info; | |
00ee8b60 | 1126 | int err, sz_change, len = strlen(symname); |
0e4dda29 | 1127 | struct fscrypt_str disk_link; |
1e51764a | 1128 | struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1, |
dab4b4d2 AB |
1129 | .new_ino_d = ALIGN(len, 8), |
1130 | .dirtied_ino = 1 }; | |
ca7f85be RW |
1131 | struct fscrypt_name nm; |
1132 | ||
0e4dda29 EB |
1133 | dbg_gen("dent '%pd', target '%s' in dir ino %lu", dentry, |
1134 | symname, dir->i_ino); | |
ca7f85be | 1135 | |
0e4dda29 EB |
1136 | err = fscrypt_prepare_symlink(dir, symname, len, UBIFS_MAX_INO_DATA, |
1137 | &disk_link); | |
1138 | if (err) | |
1139 | return err; | |
1e51764a AB |
1140 | |
1141 | /* | |
1142 | * Budget request settings: new inode, new direntry and changing parent | |
1143 | * directory inode. | |
1144 | */ | |
1e51764a AB |
1145 | err = ubifs_budget_space(c, &req); |
1146 | if (err) | |
1147 | return err; | |
1148 | ||
ca7f85be RW |
1149 | err = fscrypt_setup_filename(dir, &dentry->d_name, 0, &nm); |
1150 | if (err) | |
1151 | goto out_budg; | |
1152 | ||
00ee8b60 RW |
1153 | sz_change = CALC_DENT_SIZE(fname_len(&nm)); |
1154 | ||
1e51764a AB |
1155 | inode = ubifs_new_inode(c, dir, S_IFLNK | S_IRWXUGO); |
1156 | if (IS_ERR(inode)) { | |
1157 | err = PTR_ERR(inode); | |
ca7f85be | 1158 | goto out_fname; |
1e51764a AB |
1159 | } |
1160 | ||
1161 | ui = ubifs_inode(inode); | |
ca7f85be | 1162 | ui->data = kmalloc(disk_link.len, GFP_NOFS); |
1e51764a AB |
1163 | if (!ui->data) { |
1164 | err = -ENOMEM; | |
1165 | goto out_inode; | |
1166 | } | |
1167 | ||
0e4dda29 EB |
1168 | if (IS_ENCRYPTED(inode)) { |
1169 | disk_link.name = ui->data; /* encrypt directly into ui->data */ | |
1170 | err = fscrypt_encrypt_symlink(inode, symname, len, &disk_link); | |
6b46d444 | 1171 | if (err) |
ca7f85be | 1172 | goto out_inode; |
ca7f85be | 1173 | } else { |
0e4dda29 | 1174 | memcpy(ui->data, disk_link.name, disk_link.len); |
ca7f85be RW |
1175 | inode->i_link = ui->data; |
1176 | } | |
1177 | ||
1e51764a AB |
1178 | /* |
1179 | * The terminating zero byte is not written to the flash media and it | |
1180 | * is put just to make later in-memory string processing simpler. Thus, | |
0e4dda29 | 1181 | * data length is @disk_link.len - 1, not @disk_link.len. |
1e51764a | 1182 | */ |
ca7f85be RW |
1183 | ui->data_len = disk_link.len - 1; |
1184 | inode->i_size = ubifs_inode(inode)->ui_size = disk_link.len - 1; | |
1e51764a | 1185 | |
d7f0b70d SN |
1186 | err = ubifs_init_security(dir, inode, &dentry->d_name); |
1187 | if (err) | |
9401a795 | 1188 | goto out_inode; |
d7f0b70d | 1189 | |
1e51764a AB |
1190 | mutex_lock(&dir_ui->ui_mutex); |
1191 | dir->i_size += sz_change; | |
1192 | dir_ui->ui_size = dir->i_size; | |
1193 | dir->i_mtime = dir->i_ctime = inode->i_ctime; | |
ca7f85be | 1194 | err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0); |
1e51764a AB |
1195 | if (err) |
1196 | goto out_cancel; | |
1197 | mutex_unlock(&dir_ui->ui_mutex); | |
1198 | ||
1e51764a AB |
1199 | insert_inode_hash(inode); |
1200 | d_instantiate(dentry, inode); | |
6b46d444 EB |
1201 | err = 0; |
1202 | goto out_fname; | |
1e51764a AB |
1203 | |
1204 | out_cancel: | |
1205 | dir->i_size -= sz_change; | |
1206 | dir_ui->ui_size = dir->i_size; | |
1207 | mutex_unlock(&dir_ui->ui_mutex); | |
1208 | out_inode: | |
1209 | make_bad_inode(inode); | |
1210 | iput(inode); | |
ca7f85be RW |
1211 | out_fname: |
1212 | fscrypt_free_filename(&nm); | |
1e51764a AB |
1213 | out_budg: |
1214 | ubifs_release_budget(c, &req); | |
1215 | return err; | |
1216 | } | |
1217 | ||
1218 | /** | |
9e0a1fff | 1219 | * lock_4_inodes - a wrapper for locking three UBIFS inodes. |
1e51764a AB |
1220 | * @inode1: first inode |
1221 | * @inode2: second inode | |
1222 | * @inode3: third inode | |
9e0a1fff | 1223 | * @inode4: fouth inode |
1e51764a | 1224 | * |
82c1593c | 1225 | * This function is used for 'ubifs_rename()' and @inode1 may be the same as |
9e0a1fff | 1226 | * @inode2 whereas @inode3 and @inode4 may be %NULL. |
82c1593c AB |
1227 | * |
1228 | * We do not implement any tricks to guarantee strict lock ordering, because | |
1229 | * VFS has already done it for us on the @i_mutex. So this is just a simple | |
1230 | * wrapper function. | |
1e51764a | 1231 | */ |
9e0a1fff RW |
1232 | static void lock_4_inodes(struct inode *inode1, struct inode *inode2, |
1233 | struct inode *inode3, struct inode *inode4) | |
1e51764a | 1234 | { |
82c1593c AB |
1235 | mutex_lock_nested(&ubifs_inode(inode1)->ui_mutex, WB_MUTEX_1); |
1236 | if (inode2 != inode1) | |
1237 | mutex_lock_nested(&ubifs_inode(inode2)->ui_mutex, WB_MUTEX_2); | |
1238 | if (inode3) | |
1239 | mutex_lock_nested(&ubifs_inode(inode3)->ui_mutex, WB_MUTEX_3); | |
9e0a1fff RW |
1240 | if (inode4) |
1241 | mutex_lock_nested(&ubifs_inode(inode4)->ui_mutex, WB_MUTEX_4); | |
1e51764a AB |
1242 | } |
1243 | ||
1244 | /** | |
9e0a1fff | 1245 | * unlock_4_inodes - a wrapper for unlocking three UBIFS inodes for rename. |
1e51764a AB |
1246 | * @inode1: first inode |
1247 | * @inode2: second inode | |
1248 | * @inode3: third inode | |
9e0a1fff | 1249 | * @inode4: fouth inode |
1e51764a | 1250 | */ |
9e0a1fff RW |
1251 | static void unlock_4_inodes(struct inode *inode1, struct inode *inode2, |
1252 | struct inode *inode3, struct inode *inode4) | |
1e51764a | 1253 | { |
9e0a1fff RW |
1254 | if (inode4) |
1255 | mutex_unlock(&ubifs_inode(inode4)->ui_mutex); | |
1e51764a AB |
1256 | if (inode3) |
1257 | mutex_unlock(&ubifs_inode(inode3)->ui_mutex); | |
82c1593c AB |
1258 | if (inode1 != inode2) |
1259 | mutex_unlock(&ubifs_inode(inode2)->ui_mutex); | |
1260 | mutex_unlock(&ubifs_inode(inode1)->ui_mutex); | |
1e51764a AB |
1261 | } |
1262 | ||
390975ac RW |
1263 | static int do_rename(struct inode *old_dir, struct dentry *old_dentry, |
1264 | struct inode *new_dir, struct dentry *new_dentry, | |
1265 | unsigned int flags) | |
1e51764a AB |
1266 | { |
1267 | struct ubifs_info *c = old_dir->i_sb->s_fs_info; | |
2b0143b5 DH |
1268 | struct inode *old_inode = d_inode(old_dentry); |
1269 | struct inode *new_inode = d_inode(new_dentry); | |
9e0a1fff | 1270 | struct inode *whiteout = NULL; |
1e51764a | 1271 | struct ubifs_inode *old_inode_ui = ubifs_inode(old_inode); |
9e0a1fff | 1272 | struct ubifs_inode *whiteout_ui = NULL; |
1e51764a AB |
1273 | int err, release, sync = 0, move = (new_dir != old_dir); |
1274 | int is_dir = S_ISDIR(old_inode->i_mode); | |
f4f61d2c | 1275 | int unlink = !!new_inode, new_sz, old_sz; |
1e51764a AB |
1276 | struct ubifs_budget_req req = { .new_dent = 1, .mod_dent = 1, |
1277 | .dirtied_ino = 3 }; | |
1278 | struct ubifs_budget_req ino_req = { .dirtied_ino = 1, | |
dab4b4d2 | 1279 | .dirtied_ino_d = ALIGN(old_inode_ui->data_len, 8) }; |
95582b00 | 1280 | struct timespec64 time; |
782759b9 | 1281 | unsigned int uninitialized_var(saved_nlink); |
f4f61d2c | 1282 | struct fscrypt_name old_nm, new_nm; |
1e51764a AB |
1283 | |
1284 | /* | |
1285 | * Budget request settings: deletion direntry, new direntry, removing | |
1286 | * the old inode, and changing old and new parent directory inodes. | |
1287 | * | |
1288 | * However, this operation also marks the target inode as dirty and | |
1289 | * does not write it, so we allocate budget for the target inode | |
1290 | * separately. | |
1291 | */ | |
1292 | ||
9e0a1fff | 1293 | dbg_gen("dent '%pd' ino %lu in dir ino %lu to dent '%pd' in dir ino %lu flags 0x%x", |
4cb2a01d | 1294 | old_dentry, old_inode->i_ino, old_dir->i_ino, |
9e0a1fff RW |
1295 | new_dentry, new_dir->i_ino, flags); |
1296 | ||
82c1593c | 1297 | if (unlink) |
6eb61d58 | 1298 | ubifs_assert(c, inode_is_locked(new_inode)); |
82c1593c | 1299 | |
1e51764a | 1300 | if (unlink && is_dir) { |
f6337d84 | 1301 | err = ubifs_check_dir_empty(new_inode); |
1e51764a AB |
1302 | if (err) |
1303 | return err; | |
1304 | } | |
1305 | ||
f4f61d2c | 1306 | err = fscrypt_setup_filename(old_dir, &old_dentry->d_name, 0, &old_nm); |
1e51764a AB |
1307 | if (err) |
1308 | return err; | |
f4f61d2c RW |
1309 | |
1310 | err = fscrypt_setup_filename(new_dir, &new_dentry->d_name, 0, &new_nm); | |
1311 | if (err) { | |
1312 | fscrypt_free_filename(&old_nm); | |
1313 | return err; | |
1314 | } | |
1315 | ||
1316 | new_sz = CALC_DENT_SIZE(fname_len(&new_nm)); | |
1317 | old_sz = CALC_DENT_SIZE(fname_len(&old_nm)); | |
1318 | ||
1319 | err = ubifs_budget_space(c, &req); | |
1320 | if (err) { | |
1321 | fscrypt_free_filename(&old_nm); | |
1322 | fscrypt_free_filename(&new_nm); | |
1323 | return err; | |
1324 | } | |
1e51764a AB |
1325 | err = ubifs_budget_space(c, &ino_req); |
1326 | if (err) { | |
f4f61d2c RW |
1327 | fscrypt_free_filename(&old_nm); |
1328 | fscrypt_free_filename(&new_nm); | |
1e51764a AB |
1329 | ubifs_release_budget(c, &req); |
1330 | return err; | |
1331 | } | |
1332 | ||
9e0a1fff RW |
1333 | if (flags & RENAME_WHITEOUT) { |
1334 | union ubifs_dev_desc *dev = NULL; | |
1335 | ||
1336 | dev = kmalloc(sizeof(union ubifs_dev_desc), GFP_NOFS); | |
1337 | if (!dev) { | |
bb50c632 HL |
1338 | err = -ENOMEM; |
1339 | goto out_release; | |
9e0a1fff RW |
1340 | } |
1341 | ||
1342 | err = do_tmpfile(old_dir, old_dentry, S_IFCHR | WHITEOUT_MODE, &whiteout); | |
1343 | if (err) { | |
9e0a1fff | 1344 | kfree(dev); |
bb50c632 | 1345 | goto out_release; |
9e0a1fff RW |
1346 | } |
1347 | ||
1348 | whiteout->i_state |= I_LINKABLE; | |
1349 | whiteout_ui = ubifs_inode(whiteout); | |
1350 | whiteout_ui->data = dev; | |
1351 | whiteout_ui->data_len = ubifs_encode_dev(dev, MKDEV(0, 0)); | |
6eb61d58 | 1352 | ubifs_assert(c, !whiteout_ui->dirty); |
9e0a1fff RW |
1353 | } |
1354 | ||
1355 | lock_4_inodes(old_dir, new_dir, new_inode, whiteout); | |
1e51764a AB |
1356 | |
1357 | /* | |
1358 | * Like most other Unix systems, set the @i_ctime for inodes on a | |
1359 | * rename. | |
1360 | */ | |
607a11ad | 1361 | time = current_time(old_dir); |
1e51764a AB |
1362 | old_inode->i_ctime = time; |
1363 | ||
1364 | /* We must adjust parent link count when renaming directories */ | |
1365 | if (is_dir) { | |
1366 | if (move) { | |
1367 | /* | |
1368 | * @old_dir loses a link because we are moving | |
1369 | * @old_inode to a different directory. | |
1370 | */ | |
1371 | drop_nlink(old_dir); | |
1372 | /* | |
1373 | * @new_dir only gains a link if we are not also | |
1374 | * overwriting an existing directory. | |
1375 | */ | |
1376 | if (!unlink) | |
1377 | inc_nlink(new_dir); | |
1378 | } else { | |
1379 | /* | |
1380 | * @old_inode is not moving to a different directory, | |
1381 | * but @old_dir still loses a link if we are | |
1382 | * overwriting an existing directory. | |
1383 | */ | |
1384 | if (unlink) | |
1385 | drop_nlink(old_dir); | |
1386 | } | |
1387 | } | |
1388 | ||
1389 | old_dir->i_size -= old_sz; | |
1390 | ubifs_inode(old_dir)->ui_size = old_dir->i_size; | |
1391 | old_dir->i_mtime = old_dir->i_ctime = time; | |
1392 | new_dir->i_mtime = new_dir->i_ctime = time; | |
1393 | ||
1394 | /* | |
1395 | * And finally, if we unlinked a direntry which happened to have the | |
1396 | * same name as the moved direntry, we have to decrement @i_nlink of | |
1397 | * the unlinked inode and change its ctime. | |
1398 | */ | |
1399 | if (unlink) { | |
1400 | /* | |
1401 | * Directories cannot have hard-links, so if this is a | |
c43be108 | 1402 | * directory, just clear @i_nlink. |
1e51764a | 1403 | */ |
c43be108 | 1404 | saved_nlink = new_inode->i_nlink; |
1e51764a | 1405 | if (is_dir) |
c43be108 AB |
1406 | clear_nlink(new_inode); |
1407 | else | |
1e51764a AB |
1408 | drop_nlink(new_inode); |
1409 | new_inode->i_ctime = time; | |
1e51764a AB |
1410 | } else { |
1411 | new_dir->i_size += new_sz; | |
1412 | ubifs_inode(new_dir)->ui_size = new_dir->i_size; | |
1413 | } | |
1414 | ||
1415 | /* | |
1416 | * Do not ask 'ubifs_jnl_rename()' to flush write-buffer if @old_inode | |
1417 | * is dirty, because this will be done later on at the end of | |
1418 | * 'ubifs_rename()'. | |
1419 | */ | |
1420 | if (IS_SYNC(old_inode)) { | |
1421 | sync = IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir); | |
1422 | if (unlink && IS_SYNC(new_inode)) | |
1423 | sync = 1; | |
1424 | } | |
9e0a1fff RW |
1425 | |
1426 | if (whiteout) { | |
1427 | struct ubifs_budget_req wht_req = { .dirtied_ino = 1, | |
1428 | .dirtied_ino_d = \ | |
1429 | ALIGN(ubifs_inode(whiteout)->data_len, 8) }; | |
1430 | ||
1431 | err = ubifs_budget_space(c, &wht_req); | |
1432 | if (err) { | |
9e0a1fff RW |
1433 | kfree(whiteout_ui->data); |
1434 | whiteout_ui->data_len = 0; | |
1435 | iput(whiteout); | |
bb50c632 | 1436 | goto out_release; |
9e0a1fff RW |
1437 | } |
1438 | ||
1439 | inc_nlink(whiteout); | |
1440 | mark_inode_dirty(whiteout); | |
1441 | whiteout->i_state &= ~I_LINKABLE; | |
1442 | iput(whiteout); | |
1443 | } | |
1444 | ||
f4f61d2c RW |
1445 | err = ubifs_jnl_rename(c, old_dir, old_inode, &old_nm, new_dir, |
1446 | new_inode, &new_nm, whiteout, sync); | |
1e51764a AB |
1447 | if (err) |
1448 | goto out_cancel; | |
1449 | ||
9e0a1fff | 1450 | unlock_4_inodes(old_dir, new_dir, new_inode, whiteout); |
1e51764a AB |
1451 | ubifs_release_budget(c, &req); |
1452 | ||
1453 | mutex_lock(&old_inode_ui->ui_mutex); | |
1454 | release = old_inode_ui->dirty; | |
1455 | mark_inode_dirty_sync(old_inode); | |
1456 | mutex_unlock(&old_inode_ui->ui_mutex); | |
1457 | ||
1458 | if (release) | |
1459 | ubifs_release_budget(c, &ino_req); | |
1460 | if (IS_SYNC(old_inode)) | |
a9185b41 | 1461 | err = old_inode->i_sb->s_op->write_inode(old_inode, NULL); |
f4f61d2c RW |
1462 | |
1463 | fscrypt_free_filename(&old_nm); | |
1464 | fscrypt_free_filename(&new_nm); | |
1e51764a AB |
1465 | return err; |
1466 | ||
1467 | out_cancel: | |
1468 | if (unlink) { | |
c43be108 | 1469 | set_nlink(new_inode, saved_nlink); |
1e51764a AB |
1470 | } else { |
1471 | new_dir->i_size -= new_sz; | |
1472 | ubifs_inode(new_dir)->ui_size = new_dir->i_size; | |
1473 | } | |
1474 | old_dir->i_size += old_sz; | |
1475 | ubifs_inode(old_dir)->ui_size = old_dir->i_size; | |
1476 | if (is_dir) { | |
1477 | if (move) { | |
1478 | inc_nlink(old_dir); | |
1479 | if (!unlink) | |
1480 | drop_nlink(new_dir); | |
1481 | } else { | |
1482 | if (unlink) | |
1483 | inc_nlink(old_dir); | |
1484 | } | |
1485 | } | |
9e0a1fff RW |
1486 | if (whiteout) { |
1487 | drop_nlink(whiteout); | |
1488 | iput(whiteout); | |
1489 | } | |
1490 | unlock_4_inodes(old_dir, new_dir, new_inode, whiteout); | |
bb50c632 | 1491 | out_release: |
1e51764a AB |
1492 | ubifs_release_budget(c, &ino_req); |
1493 | ubifs_release_budget(c, &req); | |
f4f61d2c RW |
1494 | fscrypt_free_filename(&old_nm); |
1495 | fscrypt_free_filename(&new_nm); | |
1e51764a AB |
1496 | return err; |
1497 | } | |
1498 | ||
9ec64962 RW |
1499 | static int ubifs_xrename(struct inode *old_dir, struct dentry *old_dentry, |
1500 | struct inode *new_dir, struct dentry *new_dentry) | |
1501 | { | |
1502 | struct ubifs_info *c = old_dir->i_sb->s_fs_info; | |
1503 | struct ubifs_budget_req req = { .new_dent = 1, .mod_dent = 1, | |
1504 | .dirtied_ino = 2 }; | |
1505 | int sync = IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir); | |
1506 | struct inode *fst_inode = d_inode(old_dentry); | |
1507 | struct inode *snd_inode = d_inode(new_dentry); | |
95582b00 | 1508 | struct timespec64 time; |
9ec64962 | 1509 | int err; |
f4f61d2c | 1510 | struct fscrypt_name fst_nm, snd_nm; |
9ec64962 | 1511 | |
6eb61d58 | 1512 | ubifs_assert(c, fst_inode && snd_inode); |
9ec64962 | 1513 | |
f4f61d2c RW |
1514 | err = fscrypt_setup_filename(old_dir, &old_dentry->d_name, 0, &fst_nm); |
1515 | if (err) | |
1516 | return err; | |
1517 | ||
1518 | err = fscrypt_setup_filename(new_dir, &new_dentry->d_name, 0, &snd_nm); | |
1519 | if (err) { | |
1520 | fscrypt_free_filename(&fst_nm); | |
1521 | return err; | |
1522 | } | |
1523 | ||
9ec64962 RW |
1524 | lock_4_inodes(old_dir, new_dir, NULL, NULL); |
1525 | ||
607a11ad | 1526 | time = current_time(old_dir); |
9ec64962 RW |
1527 | fst_inode->i_ctime = time; |
1528 | snd_inode->i_ctime = time; | |
1529 | old_dir->i_mtime = old_dir->i_ctime = time; | |
1530 | new_dir->i_mtime = new_dir->i_ctime = time; | |
1531 | ||
1532 | if (old_dir != new_dir) { | |
1533 | if (S_ISDIR(fst_inode->i_mode) && !S_ISDIR(snd_inode->i_mode)) { | |
1534 | inc_nlink(new_dir); | |
1535 | drop_nlink(old_dir); | |
1536 | } | |
1537 | else if (!S_ISDIR(fst_inode->i_mode) && S_ISDIR(snd_inode->i_mode)) { | |
1538 | drop_nlink(new_dir); | |
1539 | inc_nlink(old_dir); | |
1540 | } | |
1541 | } | |
1542 | ||
f4f61d2c RW |
1543 | err = ubifs_jnl_xrename(c, old_dir, fst_inode, &fst_nm, new_dir, |
1544 | snd_inode, &snd_nm, sync); | |
9ec64962 RW |
1545 | |
1546 | unlock_4_inodes(old_dir, new_dir, NULL, NULL); | |
1547 | ubifs_release_budget(c, &req); | |
1548 | ||
f4f61d2c RW |
1549 | fscrypt_free_filename(&fst_nm); |
1550 | fscrypt_free_filename(&snd_nm); | |
9ec64962 RW |
1551 | return err; |
1552 | } | |
1553 | ||
390975ac | 1554 | static int ubifs_rename(struct inode *old_dir, struct dentry *old_dentry, |
9ec64962 RW |
1555 | struct inode *new_dir, struct dentry *new_dentry, |
1556 | unsigned int flags) | |
1557 | { | |
0c1ad524 | 1558 | int err; |
6eb61d58 | 1559 | struct ubifs_info *c = old_dir->i_sb->s_fs_info; |
0c1ad524 | 1560 | |
9ec64962 RW |
1561 | if (flags & ~(RENAME_NOREPLACE | RENAME_WHITEOUT | RENAME_EXCHANGE)) |
1562 | return -EINVAL; | |
1563 | ||
6eb61d58 RW |
1564 | ubifs_assert(c, inode_is_locked(old_dir)); |
1565 | ubifs_assert(c, inode_is_locked(new_dir)); | |
9ec64962 | 1566 | |
0c1ad524 EB |
1567 | err = fscrypt_prepare_rename(old_dir, old_dentry, new_dir, new_dentry, |
1568 | flags); | |
1569 | if (err) | |
1570 | return err; | |
1571 | ||
9ec64962 RW |
1572 | if (flags & RENAME_EXCHANGE) |
1573 | return ubifs_xrename(old_dir, old_dentry, new_dir, new_dentry); | |
1574 | ||
390975ac | 1575 | return do_rename(old_dir, old_dentry, new_dir, new_dentry, flags); |
9ec64962 RW |
1576 | } |
1577 | ||
a528d35e DH |
1578 | int ubifs_getattr(const struct path *path, struct kstat *stat, |
1579 | u32 request_mask, unsigned int flags) | |
1e51764a AB |
1580 | { |
1581 | loff_t size; | |
a528d35e | 1582 | struct inode *inode = d_inode(path->dentry); |
1e51764a AB |
1583 | struct ubifs_inode *ui = ubifs_inode(inode); |
1584 | ||
1585 | mutex_lock(&ui->ui_mutex); | |
a02a6eba RW |
1586 | |
1587 | if (ui->flags & UBIFS_APPEND_FL) | |
1588 | stat->attributes |= STATX_ATTR_APPEND; | |
1589 | if (ui->flags & UBIFS_COMPR_FL) | |
1590 | stat->attributes |= STATX_ATTR_COMPRESSED; | |
1591 | if (ui->flags & UBIFS_CRYPT_FL) | |
1592 | stat->attributes |= STATX_ATTR_ENCRYPTED; | |
1593 | if (ui->flags & UBIFS_IMMUTABLE_FL) | |
1594 | stat->attributes |= STATX_ATTR_IMMUTABLE; | |
1595 | ||
1596 | stat->attributes_mask |= (STATX_ATTR_APPEND | | |
1597 | STATX_ATTR_COMPRESSED | | |
1598 | STATX_ATTR_ENCRYPTED | | |
1599 | STATX_ATTR_IMMUTABLE); | |
1600 | ||
6d42e7e9 | 1601 | generic_fillattr(inode, stat); |
1e51764a AB |
1602 | stat->blksize = UBIFS_BLOCK_SIZE; |
1603 | stat->size = ui->ui_size; | |
1604 | ||
1605 | /* | |
1606 | * Unfortunately, the 'stat()' system call was designed for block | |
1607 | * device based file systems, and it is not appropriate for UBIFS, | |
1608 | * because UBIFS does not have notion of "block". For example, it is | |
1609 | * difficult to tell how many block a directory takes - it actually | |
1610 | * takes less than 300 bytes, but we have to round it to block size, | |
1611 | * which introduces large mistake. This makes utilities like 'du' to | |
1612 | * report completely senseless numbers. This is the reason why UBIFS | |
1613 | * goes the same way as JFFS2 - it reports zero blocks for everything | |
1614 | * but regular files, which makes more sense than reporting completely | |
1615 | * wrong sizes. | |
1616 | */ | |
1617 | if (S_ISREG(inode->i_mode)) { | |
1618 | size = ui->xattr_size; | |
1619 | size += stat->size; | |
1620 | size = ALIGN(size, UBIFS_BLOCK_SIZE); | |
1621 | /* | |
1622 | * Note, user-space expects 512-byte blocks count irrespectively | |
1623 | * of what was reported in @stat->size. | |
1624 | */ | |
1625 | stat->blocks = size >> 9; | |
1626 | } else | |
1627 | stat->blocks = 0; | |
1628 | mutex_unlock(&ui->ui_mutex); | |
1629 | return 0; | |
1630 | } | |
1631 | ||
ba40e6a3 RW |
1632 | static int ubifs_dir_open(struct inode *dir, struct file *file) |
1633 | { | |
1634 | if (ubifs_crypt_is_encrypted(dir)) | |
1635 | return fscrypt_get_encryption_info(dir) ? -EACCES : 0; | |
1636 | ||
1637 | return 0; | |
1638 | } | |
1639 | ||
e8b81566 | 1640 | const struct inode_operations ubifs_dir_inode_operations = { |
1e51764a AB |
1641 | .lookup = ubifs_lookup, |
1642 | .create = ubifs_create, | |
1643 | .link = ubifs_link, | |
1644 | .symlink = ubifs_symlink, | |
1645 | .unlink = ubifs_unlink, | |
1646 | .mkdir = ubifs_mkdir, | |
1647 | .rmdir = ubifs_rmdir, | |
1648 | .mknod = ubifs_mknod, | |
390975ac | 1649 | .rename = ubifs_rename, |
1e51764a AB |
1650 | .setattr = ubifs_setattr, |
1651 | .getattr = ubifs_getattr, | |
7e5471ce | 1652 | #ifdef CONFIG_UBIFS_FS_XATTR |
1e51764a | 1653 | .listxattr = ubifs_listxattr, |
7e5471ce | 1654 | #endif |
8c1c5f26 DY |
1655 | #ifdef CONFIG_UBIFS_ATIME_SUPPORT |
1656 | .update_time = ubifs_update_time, | |
1657 | #endif | |
474b9370 | 1658 | .tmpfile = ubifs_tmpfile, |
1e51764a AB |
1659 | }; |
1660 | ||
e8b81566 | 1661 | const struct file_operations ubifs_dir_operations = { |
01122e06 | 1662 | .llseek = generic_file_llseek, |
1e51764a AB |
1663 | .release = ubifs_dir_release, |
1664 | .read = generic_read_dir, | |
c51da20c | 1665 | .iterate_shared = ubifs_readdir, |
1e51764a AB |
1666 | .fsync = ubifs_fsync, |
1667 | .unlocked_ioctl = ubifs_ioctl, | |
ba40e6a3 | 1668 | .open = ubifs_dir_open, |
1e51764a AB |
1669 | #ifdef CONFIG_COMPAT |
1670 | .compat_ioctl = ubifs_compat_ioctl, | |
1671 | #endif | |
1672 | }; |