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; | |
146 | break; | |
147 | default: | |
148 | BUG(); | |
149 | } | |
150 | ||
151 | ui->flags = inherit_flags(dir, mode); | |
152 | ubifs_set_inode_flags(inode); | |
153 | if (S_ISREG(mode)) | |
154 | ui->compr_type = c->default_compr; | |
155 | else | |
156 | ui->compr_type = UBIFS_COMPR_NONE; | |
157 | ui->synced_i_size = 0; | |
158 | ||
159 | spin_lock(&c->cnt_lock); | |
160 | /* Inode number overflow is currently not supported */ | |
161 | if (c->highest_inum >= INUM_WARN_WATERMARK) { | |
162 | if (c->highest_inum >= INUM_WATERMARK) { | |
163 | spin_unlock(&c->cnt_lock); | |
235c362b | 164 | ubifs_err(c, "out of inode numbers"); |
1e51764a AB |
165 | make_bad_inode(inode); |
166 | iput(inode); | |
167 | return ERR_PTR(-EINVAL); | |
168 | } | |
1a7e985d | 169 | ubifs_warn(c, "running out of inode numbers (current %lu, max %u)", |
e84461ad | 170 | (unsigned long)c->highest_inum, INUM_WATERMARK); |
1e51764a AB |
171 | } |
172 | ||
173 | inode->i_ino = ++c->highest_inum; | |
1e51764a AB |
174 | /* |
175 | * The creation sequence number remains with this inode for its | |
176 | * lifetime. All nodes for this inode have a greater sequence number, | |
177 | * and so it is possible to distinguish obsolete nodes belonging to a | |
178 | * previous incarnation of the same inode number - for example, for the | |
179 | * purpose of rebuilding the index. | |
180 | */ | |
181 | ui->creat_sqnum = ++c->max_sqnum; | |
182 | spin_unlock(&c->cnt_lock); | |
d475a507 RW |
183 | |
184 | if (encrypted) { | |
185 | err = fscrypt_inherit_context(dir, inode, &encrypted, true); | |
186 | if (err) { | |
187 | ubifs_err(c, "fscrypt_inherit_context failed: %i", err); | |
188 | make_bad_inode(inode); | |
189 | iput(inode); | |
190 | return ERR_PTR(err); | |
191 | } | |
192 | } | |
193 | ||
1e51764a AB |
194 | return inode; |
195 | } | |
196 | ||
bb2615d4 AB |
197 | static int dbg_check_name(const struct ubifs_info *c, |
198 | const struct ubifs_dent_node *dent, | |
f4f61d2c | 199 | const struct fscrypt_name *nm) |
1e51764a | 200 | { |
2b1844a8 | 201 | if (!dbg_is_chk_gen(c)) |
1e51764a | 202 | return 0; |
f4f61d2c | 203 | if (le16_to_cpu(dent->nlen) != fname_len(nm)) |
1e51764a | 204 | return -EINVAL; |
f4f61d2c | 205 | if (memcmp(dent->name, fname_name(nm), fname_len(nm))) |
1e51764a AB |
206 | return -EINVAL; |
207 | return 0; | |
208 | } | |
209 | ||
1e51764a | 210 | static struct dentry *ubifs_lookup(struct inode *dir, struct dentry *dentry, |
00cd8dd3 | 211 | unsigned int flags) |
1e51764a AB |
212 | { |
213 | int err; | |
214 | union ubifs_key key; | |
215 | struct inode *inode = NULL; | |
216 | struct ubifs_dent_node *dent; | |
217 | struct ubifs_info *c = dir->i_sb->s_fs_info; | |
f4f61d2c | 218 | struct fscrypt_name nm; |
1e51764a | 219 | |
4cb2a01d | 220 | dbg_gen("'%pd' in dir ino %lu", dentry, dir->i_ino); |
1e51764a | 221 | |
9270b2f4 RW |
222 | if (ubifs_crypt_is_encrypted(dir)) { |
223 | err = fscrypt_get_encryption_info(dir); | |
224 | ||
225 | /* | |
226 | * DCACHE_ENCRYPTED_WITH_KEY is set if the dentry is | |
227 | * created while the directory was encrypted and we | |
228 | * have access to the key. | |
229 | */ | |
230 | if (fscrypt_has_encryption_key(dir)) | |
231 | fscrypt_set_encrypted_dentry(dentry); | |
232 | fscrypt_set_d_op(dentry); | |
233 | if (err && err != -ENOKEY) | |
234 | return ERR_PTR(err); | |
235 | } | |
236 | ||
f4f61d2c RW |
237 | err = fscrypt_setup_filename(dir, &dentry->d_name, 1, &nm); |
238 | if (err) | |
239 | return ERR_PTR(err); | |
240 | ||
241 | if (fname_len(&nm) > UBIFS_MAX_NLEN) { | |
242 | err = -ENAMETOOLONG; | |
243 | goto out_fname; | |
244 | } | |
1e51764a AB |
245 | |
246 | dent = kmalloc(UBIFS_MAX_DENT_NODE_SZ, GFP_NOFS); | |
f4f61d2c RW |
247 | if (!dent) { |
248 | err = -ENOMEM; | |
249 | goto out_fname; | |
250 | } | |
1e51764a | 251 | |
f4f61d2c RW |
252 | if (nm.hash) { |
253 | ubifs_assert(fname_len(&nm) == 0); | |
254 | ubifs_assert(fname_name(&nm) == NULL); | |
255 | dent_key_init_hash(c, &key, dir->i_ino, nm.hash); | |
528e3d17 | 256 | err = ubifs_tnc_lookup_dh(c, &key, dent, nm.minor_hash); |
f4f61d2c RW |
257 | } else { |
258 | dent_key_init(c, &key, dir->i_ino, &nm); | |
259 | err = ubifs_tnc_lookup_nm(c, &key, dent, &nm); | |
260 | } | |
1e51764a | 261 | |
1e51764a | 262 | if (err) { |
720b499c | 263 | if (err == -ENOENT) { |
1e51764a AB |
264 | dbg_gen("not found"); |
265 | goto done; | |
266 | } | |
f4f61d2c | 267 | goto out_dent; |
1e51764a AB |
268 | } |
269 | ||
f4f61d2c | 270 | if (dbg_check_name(c, dent, &nm)) { |
1e51764a | 271 | err = -EINVAL; |
f4f61d2c | 272 | goto out_dent; |
1e51764a AB |
273 | } |
274 | ||
275 | inode = ubifs_iget(dir->i_sb, le64_to_cpu(dent->inum)); | |
276 | if (IS_ERR(inode)) { | |
277 | /* | |
278 | * This should not happen. Probably the file-system needs | |
279 | * checking. | |
280 | */ | |
281 | err = PTR_ERR(inode); | |
235c362b | 282 | ubifs_err(c, "dead directory entry '%pd', error %d", |
4cb2a01d | 283 | dentry, err); |
1e51764a | 284 | ubifs_ro_mode(c, err); |
f4f61d2c | 285 | goto out_dent; |
1e51764a AB |
286 | } |
287 | ||
413d5a9e EB |
288 | if (ubifs_crypt_is_encrypted(dir) && |
289 | (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) && | |
290 | !fscrypt_has_permitted_context(dir, inode)) { | |
291 | ubifs_warn(c, "Inconsistent encryption contexts: %lu/%lu", | |
292 | dir->i_ino, inode->i_ino); | |
293 | err = -EPERM; | |
294 | goto out_inode; | |
295 | } | |
296 | ||
1e51764a AB |
297 | done: |
298 | kfree(dent); | |
f4f61d2c | 299 | fscrypt_free_filename(&nm); |
1e51764a AB |
300 | /* |
301 | * Note, d_splice_alias() would be required instead if we supported | |
302 | * NFS. | |
303 | */ | |
304 | d_add(dentry, inode); | |
305 | return NULL; | |
306 | ||
413d5a9e EB |
307 | out_inode: |
308 | iput(inode); | |
f4f61d2c | 309 | out_dent: |
1e51764a | 310 | kfree(dent); |
f4f61d2c RW |
311 | out_fname: |
312 | fscrypt_free_filename(&nm); | |
1e51764a AB |
313 | return ERR_PTR(err); |
314 | } | |
315 | ||
4acdaf27 | 316 | static int ubifs_create(struct inode *dir, struct dentry *dentry, umode_t mode, |
ebfc3b49 | 317 | bool excl) |
1e51764a AB |
318 | { |
319 | struct inode *inode; | |
320 | struct ubifs_info *c = dir->i_sb->s_fs_info; | |
1e51764a AB |
321 | struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1, |
322 | .dirtied_ino = 1 }; | |
323 | struct ubifs_inode *dir_ui = ubifs_inode(dir); | |
f4f61d2c RW |
324 | struct fscrypt_name nm; |
325 | int err, sz_change; | |
1e51764a AB |
326 | |
327 | /* | |
328 | * Budget request settings: new inode, new direntry, changing the | |
329 | * parent directory inode. | |
330 | */ | |
331 | ||
4cb2a01d AV |
332 | dbg_gen("dent '%pd', mode %#hx in dir ino %lu", |
333 | dentry, mode, dir->i_ino); | |
1e51764a AB |
334 | |
335 | err = ubifs_budget_space(c, &req); | |
336 | if (err) | |
337 | return err; | |
338 | ||
f4f61d2c RW |
339 | err = fscrypt_setup_filename(dir, &dentry->d_name, 0, &nm); |
340 | if (err) | |
341 | goto out_budg; | |
342 | ||
343 | sz_change = CALC_DENT_SIZE(fname_len(&nm)); | |
344 | ||
1e51764a AB |
345 | inode = ubifs_new_inode(c, dir, mode); |
346 | if (IS_ERR(inode)) { | |
347 | err = PTR_ERR(inode); | |
f4f61d2c | 348 | goto out_fname; |
1e51764a AB |
349 | } |
350 | ||
d7f0b70d SN |
351 | err = ubifs_init_security(dir, inode, &dentry->d_name); |
352 | if (err) | |
9401a795 | 353 | goto out_inode; |
d7f0b70d | 354 | |
1e51764a AB |
355 | mutex_lock(&dir_ui->ui_mutex); |
356 | dir->i_size += sz_change; | |
357 | dir_ui->ui_size = dir->i_size; | |
358 | dir->i_mtime = dir->i_ctime = inode->i_ctime; | |
f4f61d2c | 359 | err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0); |
1e51764a AB |
360 | if (err) |
361 | goto out_cancel; | |
362 | mutex_unlock(&dir_ui->ui_mutex); | |
363 | ||
364 | ubifs_release_budget(c, &req); | |
f4f61d2c | 365 | fscrypt_free_filename(&nm); |
1e51764a AB |
366 | insert_inode_hash(inode); |
367 | d_instantiate(dentry, inode); | |
368 | return 0; | |
369 | ||
370 | out_cancel: | |
371 | dir->i_size -= sz_change; | |
372 | dir_ui->ui_size = dir->i_size; | |
373 | mutex_unlock(&dir_ui->ui_mutex); | |
9401a795 | 374 | out_inode: |
1e51764a AB |
375 | make_bad_inode(inode); |
376 | iput(inode); | |
f4f61d2c RW |
377 | out_fname: |
378 | fscrypt_free_filename(&nm); | |
1e51764a AB |
379 | out_budg: |
380 | ubifs_release_budget(c, &req); | |
235c362b | 381 | ubifs_err(c, "cannot create regular file, error %d", err); |
1e51764a AB |
382 | return err; |
383 | } | |
384 | ||
9e0a1fff RW |
385 | static int do_tmpfile(struct inode *dir, struct dentry *dentry, |
386 | umode_t mode, struct inode **whiteout) | |
474b9370 RW |
387 | { |
388 | struct inode *inode; | |
389 | struct ubifs_info *c = dir->i_sb->s_fs_info; | |
390 | struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1}; | |
391 | struct ubifs_budget_req ino_req = { .dirtied_ino = 1 }; | |
392 | struct ubifs_inode *ui, *dir_ui = ubifs_inode(dir); | |
393 | int err, instantiated = 0; | |
f4f61d2c | 394 | struct fscrypt_name nm; |
474b9370 RW |
395 | |
396 | /* | |
397 | * Budget request settings: new dirty inode, new direntry, | |
398 | * budget for dirtied inode will be released via writeback. | |
399 | */ | |
400 | ||
401 | dbg_gen("dent '%pd', mode %#hx in dir ino %lu", | |
402 | dentry, mode, dir->i_ino); | |
403 | ||
f4f61d2c | 404 | err = fscrypt_setup_filename(dir, &dentry->d_name, 0, &nm); |
474b9370 RW |
405 | if (err) |
406 | return err; | |
407 | ||
f4f61d2c RW |
408 | err = ubifs_budget_space(c, &req); |
409 | if (err) { | |
410 | fscrypt_free_filename(&nm); | |
411 | return err; | |
412 | } | |
413 | ||
474b9370 RW |
414 | err = ubifs_budget_space(c, &ino_req); |
415 | if (err) { | |
416 | ubifs_release_budget(c, &req); | |
f4f61d2c | 417 | fscrypt_free_filename(&nm); |
474b9370 RW |
418 | return err; |
419 | } | |
420 | ||
421 | inode = ubifs_new_inode(c, dir, mode); | |
422 | if (IS_ERR(inode)) { | |
423 | err = PTR_ERR(inode); | |
424 | goto out_budg; | |
425 | } | |
426 | ui = ubifs_inode(inode); | |
427 | ||
9e0a1fff RW |
428 | if (whiteout) { |
429 | init_special_inode(inode, inode->i_mode, WHITEOUT_DEV); | |
430 | ubifs_assert(inode->i_op == &ubifs_file_inode_operations); | |
431 | } | |
432 | ||
474b9370 RW |
433 | err = ubifs_init_security(dir, inode, &dentry->d_name); |
434 | if (err) | |
435 | goto out_inode; | |
436 | ||
437 | mutex_lock(&ui->ui_mutex); | |
438 | insert_inode_hash(inode); | |
9e0a1fff RW |
439 | |
440 | if (whiteout) { | |
441 | mark_inode_dirty(inode); | |
442 | drop_nlink(inode); | |
443 | *whiteout = inode; | |
444 | } else { | |
445 | d_tmpfile(dentry, inode); | |
446 | } | |
474b9370 | 447 | ubifs_assert(ui->dirty); |
9e0a1fff | 448 | |
474b9370 RW |
449 | instantiated = 1; |
450 | mutex_unlock(&ui->ui_mutex); | |
451 | ||
452 | mutex_lock(&dir_ui->ui_mutex); | |
f4f61d2c | 453 | err = ubifs_jnl_update(c, dir, &nm, inode, 1, 0); |
474b9370 RW |
454 | if (err) |
455 | goto out_cancel; | |
456 | mutex_unlock(&dir_ui->ui_mutex); | |
457 | ||
458 | ubifs_release_budget(c, &req); | |
459 | ||
460 | return 0; | |
461 | ||
462 | out_cancel: | |
463 | mutex_unlock(&dir_ui->ui_mutex); | |
464 | out_inode: | |
465 | make_bad_inode(inode); | |
466 | if (!instantiated) | |
467 | iput(inode); | |
468 | out_budg: | |
469 | ubifs_release_budget(c, &req); | |
470 | if (!instantiated) | |
471 | ubifs_release_budget(c, &ino_req); | |
f4f61d2c | 472 | fscrypt_free_filename(&nm); |
474b9370 RW |
473 | ubifs_err(c, "cannot create temporary file, error %d", err); |
474 | return err; | |
475 | } | |
476 | ||
9e0a1fff RW |
477 | static int ubifs_tmpfile(struct inode *dir, struct dentry *dentry, |
478 | umode_t mode) | |
479 | { | |
480 | return do_tmpfile(dir, dentry, mode, NULL); | |
481 | } | |
482 | ||
1e51764a AB |
483 | /** |
484 | * vfs_dent_type - get VFS directory entry type. | |
485 | * @type: UBIFS directory entry type | |
486 | * | |
487 | * This function converts UBIFS directory entry type into VFS directory entry | |
488 | * type. | |
489 | */ | |
490 | static unsigned int vfs_dent_type(uint8_t type) | |
491 | { | |
492 | switch (type) { | |
493 | case UBIFS_ITYPE_REG: | |
494 | return DT_REG; | |
495 | case UBIFS_ITYPE_DIR: | |
496 | return DT_DIR; | |
497 | case UBIFS_ITYPE_LNK: | |
498 | return DT_LNK; | |
499 | case UBIFS_ITYPE_BLK: | |
500 | return DT_BLK; | |
501 | case UBIFS_ITYPE_CHR: | |
502 | return DT_CHR; | |
503 | case UBIFS_ITYPE_FIFO: | |
504 | return DT_FIFO; | |
505 | case UBIFS_ITYPE_SOCK: | |
506 | return DT_SOCK; | |
507 | default: | |
508 | BUG(); | |
509 | } | |
510 | return 0; | |
511 | } | |
512 | ||
513 | /* | |
514 | * The classical Unix view for directory is that it is a linear array of | |
515 | * (name, inode number) entries. Linux/VFS assumes this model as well. | |
516 | * Particularly, 'readdir()' call wants us to return a directory entry offset | |
517 | * which later may be used to continue 'readdir()'ing the directory or to | |
518 | * 'seek()' to that specific direntry. Obviously UBIFS does not really fit this | |
519 | * model because directory entries are identified by keys, which may collide. | |
520 | * | |
521 | * UBIFS uses directory entry hash value for directory offsets, so | |
522 | * 'seekdir()'/'telldir()' may not always work because of possible key | |
523 | * collisions. But UBIFS guarantees that consecutive 'readdir()' calls work | |
524 | * properly by means of saving full directory entry name in the private field | |
525 | * of the file description object. | |
526 | * | |
527 | * This means that UBIFS cannot support NFS which requires full | |
528 | * 'seekdir()'/'telldir()' support. | |
529 | */ | |
01122e06 | 530 | static int ubifs_readdir(struct file *file, struct dir_context *ctx) |
1e51764a | 531 | { |
ba75d570 | 532 | int fstr_real_len = 0, err = 0; |
f4f61d2c RW |
533 | struct fscrypt_name nm; |
534 | struct fscrypt_str fstr = {0}; | |
1e51764a AB |
535 | union ubifs_key key; |
536 | struct ubifs_dent_node *dent; | |
496ad9aa | 537 | struct inode *dir = file_inode(file); |
1e51764a | 538 | struct ubifs_info *c = dir->i_sb->s_fs_info; |
f4f61d2c | 539 | bool encrypted = ubifs_crypt_is_encrypted(dir); |
1e51764a | 540 | |
01122e06 | 541 | dbg_gen("dir ino %lu, f_pos %#llx", dir->i_ino, ctx->pos); |
1e51764a | 542 | |
01122e06 | 543 | if (ctx->pos > UBIFS_S_KEY_HASH_MASK || ctx->pos == 2) |
1e51764a AB |
544 | /* |
545 | * The directory was seek'ed to a senseless position or there | |
546 | * are no more entries. | |
547 | */ | |
548 | return 0; | |
549 | ||
f4f61d2c RW |
550 | if (encrypted) { |
551 | err = fscrypt_get_encryption_info(dir); | |
552 | if (err && err != -ENOKEY) | |
553 | return err; | |
554 | ||
555 | err = fscrypt_fname_alloc_buffer(dir, UBIFS_MAX_NLEN, &fstr); | |
556 | if (err) | |
557 | return err; | |
558 | ||
559 | fstr_real_len = fstr.len; | |
560 | } | |
561 | ||
605c912b AB |
562 | if (file->f_version == 0) { |
563 | /* | |
564 | * The file was seek'ed, which means that @file->private_data | |
565 | * is now invalid. This may also be just the first | |
566 | * 'ubifs_readdir()' invocation, in which case | |
567 | * @file->private_data is NULL, and the below code is | |
568 | * basically a no-op. | |
569 | */ | |
570 | kfree(file->private_data); | |
571 | file->private_data = NULL; | |
572 | } | |
573 | ||
574 | /* | |
575 | * 'generic_file_llseek()' unconditionally sets @file->f_version to | |
576 | * zero, and we use this for detecting whether the file was seek'ed. | |
577 | */ | |
578 | file->f_version = 1; | |
579 | ||
1e51764a | 580 | /* File positions 0 and 1 correspond to "." and ".." */ |
01122e06 | 581 | if (ctx->pos < 2) { |
1e51764a | 582 | ubifs_assert(!file->private_data); |
f4f61d2c RW |
583 | if (!dir_emit_dots(file, ctx)) { |
584 | if (encrypted) | |
585 | fscrypt_fname_free_buffer(&fstr); | |
1e51764a | 586 | return 0; |
f4f61d2c | 587 | } |
1e51764a AB |
588 | |
589 | /* Find the first entry in TNC and save it */ | |
590 | lowest_dent_key(c, &key, dir->i_ino); | |
f4f61d2c | 591 | fname_len(&nm) = 0; |
1e51764a AB |
592 | dent = ubifs_tnc_next_ent(c, &key, &nm); |
593 | if (IS_ERR(dent)) { | |
594 | err = PTR_ERR(dent); | |
595 | goto out; | |
596 | } | |
597 | ||
01122e06 | 598 | ctx->pos = key_hash_flash(c, &dent->key); |
1e51764a AB |
599 | file->private_data = dent; |
600 | } | |
601 | ||
602 | dent = file->private_data; | |
603 | if (!dent) { | |
604 | /* | |
605 | * The directory was seek'ed to and is now readdir'ed. | |
01122e06 | 606 | * Find the entry corresponding to @ctx->pos or the closest one. |
1e51764a | 607 | */ |
01122e06 | 608 | dent_key_init_hash(c, &key, dir->i_ino, ctx->pos); |
f4f61d2c | 609 | fname_len(&nm) = 0; |
1e51764a AB |
610 | dent = ubifs_tnc_next_ent(c, &key, &nm); |
611 | if (IS_ERR(dent)) { | |
612 | err = PTR_ERR(dent); | |
613 | goto out; | |
614 | } | |
01122e06 | 615 | ctx->pos = key_hash_flash(c, &dent->key); |
1e51764a AB |
616 | file->private_data = dent; |
617 | } | |
618 | ||
619 | while (1) { | |
b20e2d99 HL |
620 | dbg_gen("ino %llu, new f_pos %#x", |
621 | (unsigned long long)le64_to_cpu(dent->inum), | |
1e51764a | 622 | key_hash_flash(c, &dent->key)); |
0ecb9529 HH |
623 | ubifs_assert(le64_to_cpu(dent->ch.sqnum) > |
624 | ubifs_inode(dir)->creat_sqnum); | |
1e51764a | 625 | |
f4f61d2c RW |
626 | fname_len(&nm) = le16_to_cpu(dent->nlen); |
627 | fname_name(&nm) = dent->name; | |
628 | ||
629 | if (encrypted) { | |
630 | fstr.len = fstr_real_len; | |
631 | ||
528e3d17 RW |
632 | err = fscrypt_fname_disk_to_usr(dir, key_hash_flash(c, |
633 | &dent->key), | |
634 | le32_to_cpu(dent->cookie), | |
635 | &nm.disk_name, &fstr); | |
ca7f85be | 636 | if (err) |
f4f61d2c RW |
637 | goto out; |
638 | } else { | |
639 | fstr.len = fname_len(&nm); | |
640 | fstr.name = fname_name(&nm); | |
641 | } | |
642 | ||
643 | if (!dir_emit(ctx, fstr.name, fstr.len, | |
1e51764a | 644 | le64_to_cpu(dent->inum), |
f4f61d2c RW |
645 | vfs_dent_type(dent->type))) { |
646 | if (encrypted) | |
647 | fscrypt_fname_free_buffer(&fstr); | |
1e51764a | 648 | return 0; |
f4f61d2c | 649 | } |
1e51764a AB |
650 | |
651 | /* Switch to the next entry */ | |
652 | key_read(c, &dent->key, &key); | |
1e51764a AB |
653 | dent = ubifs_tnc_next_ent(c, &key, &nm); |
654 | if (IS_ERR(dent)) { | |
655 | err = PTR_ERR(dent); | |
656 | goto out; | |
657 | } | |
658 | ||
659 | kfree(file->private_data); | |
01122e06 | 660 | ctx->pos = key_hash_flash(c, &dent->key); |
1e51764a AB |
661 | file->private_data = dent; |
662 | cond_resched(); | |
663 | } | |
664 | ||
665 | out: | |
aeeb14f7 RW |
666 | kfree(file->private_data); |
667 | file->private_data = NULL; | |
668 | ||
f4f61d2c RW |
669 | if (encrypted) |
670 | fscrypt_fname_free_buffer(&fstr); | |
671 | ||
c83ed4c9 | 672 | if (err != -ENOENT) |
235c362b | 673 | ubifs_err(c, "cannot find next direntry, error %d", err); |
a00052a2 RW |
674 | else |
675 | /* | |
676 | * -ENOENT is a non-fatal error in this context, the TNC uses | |
677 | * it to indicate that the cursor moved past the current directory | |
678 | * and readdir() has to stop. | |
679 | */ | |
680 | err = 0; | |
681 | ||
1e51764a | 682 | |
605c912b | 683 | /* 2 is a special value indicating that there are no more direntries */ |
01122e06 | 684 | ctx->pos = 2; |
c83ed4c9 | 685 | return err; |
1e51764a AB |
686 | } |
687 | ||
1e51764a AB |
688 | /* Free saved readdir() state when the directory is closed */ |
689 | static int ubifs_dir_release(struct inode *dir, struct file *file) | |
690 | { | |
691 | kfree(file->private_data); | |
692 | file->private_data = NULL; | |
693 | return 0; | |
694 | } | |
695 | ||
696 | /** | |
82c1593c | 697 | * lock_2_inodes - a wrapper for locking two UBIFS inodes. |
1e51764a AB |
698 | * @inode1: first inode |
699 | * @inode2: second inode | |
82c1593c AB |
700 | * |
701 | * We do not implement any tricks to guarantee strict lock ordering, because | |
702 | * VFS has already done it for us on the @i_mutex. So this is just a simple | |
703 | * wrapper function. | |
1e51764a AB |
704 | */ |
705 | static void lock_2_inodes(struct inode *inode1, struct inode *inode2) | |
706 | { | |
82c1593c AB |
707 | mutex_lock_nested(&ubifs_inode(inode1)->ui_mutex, WB_MUTEX_1); |
708 | mutex_lock_nested(&ubifs_inode(inode2)->ui_mutex, WB_MUTEX_2); | |
1e51764a AB |
709 | } |
710 | ||
711 | /** | |
82c1593c | 712 | * unlock_2_inodes - a wrapper for unlocking two UBIFS inodes. |
1e51764a AB |
713 | * @inode1: first inode |
714 | * @inode2: second inode | |
715 | */ | |
716 | static void unlock_2_inodes(struct inode *inode1, struct inode *inode2) | |
717 | { | |
1e51764a | 718 | mutex_unlock(&ubifs_inode(inode2)->ui_mutex); |
82c1593c | 719 | mutex_unlock(&ubifs_inode(inode1)->ui_mutex); |
1e51764a AB |
720 | } |
721 | ||
722 | static int ubifs_link(struct dentry *old_dentry, struct inode *dir, | |
723 | struct dentry *dentry) | |
724 | { | |
725 | struct ubifs_info *c = dir->i_sb->s_fs_info; | |
2b0143b5 | 726 | struct inode *inode = d_inode(old_dentry); |
1e51764a AB |
727 | struct ubifs_inode *ui = ubifs_inode(inode); |
728 | struct ubifs_inode *dir_ui = ubifs_inode(dir); | |
729 | int err, sz_change = CALC_DENT_SIZE(dentry->d_name.len); | |
730 | struct ubifs_budget_req req = { .new_dent = 1, .dirtied_ino = 2, | |
dab4b4d2 | 731 | .dirtied_ino_d = ALIGN(ui->data_len, 8) }; |
f4f61d2c | 732 | struct fscrypt_name nm; |
1e51764a AB |
733 | |
734 | /* | |
735 | * Budget request settings: new direntry, changing the target inode, | |
736 | * changing the parent inode. | |
737 | */ | |
738 | ||
4cb2a01d AV |
739 | dbg_gen("dent '%pd' to ino %lu (nlink %d) in dir ino %lu", |
740 | dentry, inode->i_ino, | |
1e51764a | 741 | inode->i_nlink, dir->i_ino); |
5955102c AV |
742 | ubifs_assert(inode_is_locked(dir)); |
743 | ubifs_assert(inode_is_locked(inode)); | |
8b3884a8 | 744 | |
3d4b2fcb EB |
745 | if (ubifs_crypt_is_encrypted(dir) && |
746 | !fscrypt_has_permitted_context(dir, inode)) | |
747 | return -EPERM; | |
f4f61d2c RW |
748 | |
749 | err = fscrypt_setup_filename(dir, &dentry->d_name, 0, &nm); | |
1e51764a AB |
750 | if (err) |
751 | return err; | |
752 | ||
f4f61d2c RW |
753 | err = dbg_check_synced_i_size(c, inode); |
754 | if (err) | |
755 | goto out_fname; | |
756 | ||
1e51764a AB |
757 | err = ubifs_budget_space(c, &req); |
758 | if (err) | |
f4f61d2c | 759 | goto out_fname; |
1e51764a AB |
760 | |
761 | lock_2_inodes(dir, inode); | |
32fe905c RW |
762 | |
763 | /* Handle O_TMPFILE corner case, it is allowed to link a O_TMPFILE. */ | |
764 | if (inode->i_nlink == 0) | |
765 | ubifs_delete_orphan(c, inode->i_ino); | |
766 | ||
1e51764a | 767 | inc_nlink(inode); |
7de9c6ee | 768 | ihold(inode); |
607a11ad | 769 | inode->i_ctime = current_time(inode); |
1e51764a AB |
770 | dir->i_size += sz_change; |
771 | dir_ui->ui_size = dir->i_size; | |
772 | dir->i_mtime = dir->i_ctime = inode->i_ctime; | |
f4f61d2c | 773 | err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0); |
1e51764a AB |
774 | if (err) |
775 | goto out_cancel; | |
776 | unlock_2_inodes(dir, inode); | |
777 | ||
778 | ubifs_release_budget(c, &req); | |
779 | d_instantiate(dentry, inode); | |
f4f61d2c | 780 | fscrypt_free_filename(&nm); |
1e51764a AB |
781 | return 0; |
782 | ||
783 | out_cancel: | |
784 | dir->i_size -= sz_change; | |
785 | dir_ui->ui_size = dir->i_size; | |
786 | drop_nlink(inode); | |
32fe905c RW |
787 | if (inode->i_nlink == 0) |
788 | ubifs_add_orphan(c, inode->i_ino); | |
1e51764a AB |
789 | unlock_2_inodes(dir, inode); |
790 | ubifs_release_budget(c, &req); | |
791 | iput(inode); | |
f4f61d2c RW |
792 | out_fname: |
793 | fscrypt_free_filename(&nm); | |
1e51764a AB |
794 | return err; |
795 | } | |
796 | ||
797 | static int ubifs_unlink(struct inode *dir, struct dentry *dentry) | |
798 | { | |
799 | struct ubifs_info *c = dir->i_sb->s_fs_info; | |
2b0143b5 | 800 | struct inode *inode = d_inode(dentry); |
1e51764a | 801 | struct ubifs_inode *dir_ui = ubifs_inode(dir); |
f4f61d2c | 802 | int err, sz_change, budgeted = 1; |
1e51764a | 803 | struct ubifs_budget_req req = { .mod_dent = 1, .dirtied_ino = 2 }; |
c43be108 | 804 | unsigned int saved_nlink = inode->i_nlink; |
f4f61d2c | 805 | struct fscrypt_name nm; |
1e51764a AB |
806 | |
807 | /* | |
808 | * Budget request settings: deletion direntry, deletion inode (+1 for | |
809 | * @dirtied_ino), changing the parent directory inode. If budgeting | |
810 | * fails, go ahead anyway because we have extra space reserved for | |
811 | * deletions. | |
812 | */ | |
813 | ||
4cb2a01d AV |
814 | dbg_gen("dent '%pd' from ino %lu (nlink %d) in dir ino %lu", |
815 | dentry, inode->i_ino, | |
1e51764a | 816 | inode->i_nlink, dir->i_ino); |
f4f61d2c RW |
817 | |
818 | if (ubifs_crypt_is_encrypted(dir)) { | |
819 | err = fscrypt_get_encryption_info(dir); | |
820 | if (err && err != -ENOKEY) | |
821 | return err; | |
822 | } | |
823 | ||
824 | err = fscrypt_setup_filename(dir, &dentry->d_name, 1, &nm); | |
825 | if (err) | |
826 | return err; | |
827 | ||
828 | sz_change = CALC_DENT_SIZE(fname_len(&nm)); | |
829 | ||
5955102c AV |
830 | ubifs_assert(inode_is_locked(dir)); |
831 | ubifs_assert(inode_is_locked(inode)); | |
d808efb4 | 832 | err = dbg_check_synced_i_size(c, inode); |
1e51764a | 833 | if (err) |
f4f61d2c | 834 | goto out_fname; |
1e51764a AB |
835 | |
836 | err = ubifs_budget_space(c, &req); | |
837 | if (err) { | |
838 | if (err != -ENOSPC) | |
f4f61d2c | 839 | goto out_fname; |
1e51764a AB |
840 | budgeted = 0; |
841 | } | |
842 | ||
843 | lock_2_inodes(dir, inode); | |
607a11ad | 844 | inode->i_ctime = current_time(dir); |
1e51764a AB |
845 | drop_nlink(inode); |
846 | dir->i_size -= sz_change; | |
847 | dir_ui->ui_size = dir->i_size; | |
848 | dir->i_mtime = dir->i_ctime = inode->i_ctime; | |
f4f61d2c | 849 | err = ubifs_jnl_update(c, dir, &nm, inode, 1, 0); |
1e51764a AB |
850 | if (err) |
851 | goto out_cancel; | |
852 | unlock_2_inodes(dir, inode); | |
853 | ||
854 | if (budgeted) | |
855 | ubifs_release_budget(c, &req); | |
856 | else { | |
857 | /* We've deleted something - clean the "no space" flags */ | |
b137545c | 858 | c->bi.nospace = c->bi.nospace_rp = 0; |
1e51764a AB |
859 | smp_wmb(); |
860 | } | |
f4f61d2c | 861 | fscrypt_free_filename(&nm); |
1e51764a AB |
862 | return 0; |
863 | ||
864 | out_cancel: | |
865 | dir->i_size += sz_change; | |
866 | dir_ui->ui_size = dir->i_size; | |
c43be108 | 867 | set_nlink(inode, saved_nlink); |
1e51764a AB |
868 | unlock_2_inodes(dir, inode); |
869 | if (budgeted) | |
870 | ubifs_release_budget(c, &req); | |
f4f61d2c RW |
871 | out_fname: |
872 | fscrypt_free_filename(&nm); | |
1e51764a AB |
873 | return err; |
874 | } | |
875 | ||
876 | /** | |
877 | * check_dir_empty - check if a directory is empty or not. | |
1e51764a AB |
878 | * @dir: VFS inode object of the directory to check |
879 | * | |
880 | * This function checks if directory @dir is empty. Returns zero if the | |
881 | * directory is empty, %-ENOTEMPTY if it is not, and other negative error codes | |
882 | * in case of of errors. | |
883 | */ | |
f6337d84 | 884 | int ubifs_check_dir_empty(struct inode *dir) |
1e51764a | 885 | { |
f6337d84 | 886 | struct ubifs_info *c = dir->i_sb->s_fs_info; |
f4f61d2c | 887 | struct fscrypt_name nm = { 0 }; |
1e51764a AB |
888 | struct ubifs_dent_node *dent; |
889 | union ubifs_key key; | |
890 | int err; | |
891 | ||
892 | lowest_dent_key(c, &key, dir->i_ino); | |
893 | dent = ubifs_tnc_next_ent(c, &key, &nm); | |
894 | if (IS_ERR(dent)) { | |
895 | err = PTR_ERR(dent); | |
896 | if (err == -ENOENT) | |
897 | err = 0; | |
898 | } else { | |
899 | kfree(dent); | |
900 | err = -ENOTEMPTY; | |
901 | } | |
902 | return err; | |
903 | } | |
904 | ||
905 | static int ubifs_rmdir(struct inode *dir, struct dentry *dentry) | |
906 | { | |
907 | struct ubifs_info *c = dir->i_sb->s_fs_info; | |
2b0143b5 | 908 | struct inode *inode = d_inode(dentry); |
f4f61d2c | 909 | int err, sz_change, budgeted = 1; |
1e51764a AB |
910 | struct ubifs_inode *dir_ui = ubifs_inode(dir); |
911 | struct ubifs_budget_req req = { .mod_dent = 1, .dirtied_ino = 2 }; | |
f4f61d2c | 912 | struct fscrypt_name nm; |
1e51764a AB |
913 | |
914 | /* | |
915 | * Budget request settings: deletion direntry, deletion inode and | |
916 | * changing the parent inode. If budgeting fails, go ahead anyway | |
917 | * because we have extra space reserved for deletions. | |
918 | */ | |
919 | ||
4cb2a01d AV |
920 | dbg_gen("directory '%pd', ino %lu in dir ino %lu", dentry, |
921 | inode->i_ino, dir->i_ino); | |
5955102c AV |
922 | ubifs_assert(inode_is_locked(dir)); |
923 | ubifs_assert(inode_is_locked(inode)); | |
f6337d84 | 924 | err = ubifs_check_dir_empty(d_inode(dentry)); |
1e51764a AB |
925 | if (err) |
926 | return err; | |
927 | ||
f4f61d2c RW |
928 | if (ubifs_crypt_is_encrypted(dir)) { |
929 | err = fscrypt_get_encryption_info(dir); | |
930 | if (err && err != -ENOKEY) | |
931 | return err; | |
932 | } | |
933 | ||
934 | err = fscrypt_setup_filename(dir, &dentry->d_name, 1, &nm); | |
935 | if (err) | |
936 | return err; | |
937 | ||
938 | sz_change = CALC_DENT_SIZE(fname_len(&nm)); | |
939 | ||
1e51764a AB |
940 | err = ubifs_budget_space(c, &req); |
941 | if (err) { | |
942 | if (err != -ENOSPC) | |
f4f61d2c | 943 | goto out_fname; |
1e51764a AB |
944 | budgeted = 0; |
945 | } | |
946 | ||
947 | lock_2_inodes(dir, inode); | |
607a11ad | 948 | inode->i_ctime = current_time(dir); |
1e51764a AB |
949 | clear_nlink(inode); |
950 | drop_nlink(dir); | |
951 | dir->i_size -= sz_change; | |
952 | dir_ui->ui_size = dir->i_size; | |
953 | dir->i_mtime = dir->i_ctime = inode->i_ctime; | |
f4f61d2c | 954 | err = ubifs_jnl_update(c, dir, &nm, inode, 1, 0); |
1e51764a AB |
955 | if (err) |
956 | goto out_cancel; | |
957 | unlock_2_inodes(dir, inode); | |
958 | ||
959 | if (budgeted) | |
960 | ubifs_release_budget(c, &req); | |
961 | else { | |
962 | /* We've deleted something - clean the "no space" flags */ | |
b137545c | 963 | c->bi.nospace = c->bi.nospace_rp = 0; |
1e51764a AB |
964 | smp_wmb(); |
965 | } | |
f4f61d2c | 966 | fscrypt_free_filename(&nm); |
1e51764a AB |
967 | return 0; |
968 | ||
969 | out_cancel: | |
970 | dir->i_size += sz_change; | |
971 | dir_ui->ui_size = dir->i_size; | |
972 | inc_nlink(dir); | |
c43be108 | 973 | set_nlink(inode, 2); |
1e51764a AB |
974 | unlock_2_inodes(dir, inode); |
975 | if (budgeted) | |
976 | ubifs_release_budget(c, &req); | |
f4f61d2c RW |
977 | out_fname: |
978 | fscrypt_free_filename(&nm); | |
1e51764a AB |
979 | return err; |
980 | } | |
981 | ||
18bb1db3 | 982 | static int ubifs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
1e51764a AB |
983 | { |
984 | struct inode *inode; | |
985 | struct ubifs_inode *dir_ui = ubifs_inode(dir); | |
986 | struct ubifs_info *c = dir->i_sb->s_fs_info; | |
f4f61d2c | 987 | int err, sz_change; |
182854b4 | 988 | struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1 }; |
f4f61d2c | 989 | struct fscrypt_name nm; |
1e51764a AB |
990 | |
991 | /* | |
992 | * Budget request settings: new inode, new direntry and changing parent | |
993 | * directory inode. | |
994 | */ | |
995 | ||
4cb2a01d AV |
996 | dbg_gen("dent '%pd', mode %#hx in dir ino %lu", |
997 | dentry, mode, dir->i_ino); | |
1e51764a AB |
998 | |
999 | err = ubifs_budget_space(c, &req); | |
1000 | if (err) | |
1001 | return err; | |
1002 | ||
f4f61d2c RW |
1003 | err = fscrypt_setup_filename(dir, &dentry->d_name, 0, &nm); |
1004 | if (err) | |
1005 | goto out_budg; | |
1006 | ||
1007 | sz_change = CALC_DENT_SIZE(fname_len(&nm)); | |
1008 | ||
1e51764a AB |
1009 | inode = ubifs_new_inode(c, dir, S_IFDIR | mode); |
1010 | if (IS_ERR(inode)) { | |
1011 | err = PTR_ERR(inode); | |
f4f61d2c | 1012 | goto out_fname; |
1e51764a AB |
1013 | } |
1014 | ||
d7f0b70d SN |
1015 | err = ubifs_init_security(dir, inode, &dentry->d_name); |
1016 | if (err) | |
9401a795 | 1017 | goto out_inode; |
d7f0b70d | 1018 | |
1e51764a AB |
1019 | mutex_lock(&dir_ui->ui_mutex); |
1020 | insert_inode_hash(inode); | |
1021 | inc_nlink(inode); | |
1022 | inc_nlink(dir); | |
1023 | dir->i_size += sz_change; | |
1024 | dir_ui->ui_size = dir->i_size; | |
1025 | dir->i_mtime = dir->i_ctime = inode->i_ctime; | |
f4f61d2c | 1026 | err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0); |
1e51764a | 1027 | if (err) { |
235c362b | 1028 | ubifs_err(c, "cannot create directory, error %d", err); |
1e51764a AB |
1029 | goto out_cancel; |
1030 | } | |
1031 | mutex_unlock(&dir_ui->ui_mutex); | |
1032 | ||
1033 | ubifs_release_budget(c, &req); | |
1034 | d_instantiate(dentry, inode); | |
f4f61d2c | 1035 | fscrypt_free_filename(&nm); |
1e51764a AB |
1036 | return 0; |
1037 | ||
1038 | out_cancel: | |
1039 | dir->i_size -= sz_change; | |
1040 | dir_ui->ui_size = dir->i_size; | |
1041 | drop_nlink(dir); | |
1042 | mutex_unlock(&dir_ui->ui_mutex); | |
9401a795 | 1043 | out_inode: |
1e51764a AB |
1044 | make_bad_inode(inode); |
1045 | iput(inode); | |
f4f61d2c RW |
1046 | out_fname: |
1047 | fscrypt_free_filename(&nm); | |
1e51764a AB |
1048 | out_budg: |
1049 | ubifs_release_budget(c, &req); | |
1050 | return err; | |
1051 | } | |
1052 | ||
1053 | static int ubifs_mknod(struct inode *dir, struct dentry *dentry, | |
1a67aafb | 1054 | umode_t mode, dev_t rdev) |
1e51764a AB |
1055 | { |
1056 | struct inode *inode; | |
1057 | struct ubifs_inode *ui; | |
1058 | struct ubifs_inode *dir_ui = ubifs_inode(dir); | |
1059 | struct ubifs_info *c = dir->i_sb->s_fs_info; | |
1060 | union ubifs_dev_desc *dev = NULL; | |
f4f61d2c | 1061 | int sz_change; |
1e51764a AB |
1062 | int err, devlen = 0; |
1063 | struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1, | |
dab4b4d2 AB |
1064 | .new_ino_d = ALIGN(devlen, 8), |
1065 | .dirtied_ino = 1 }; | |
f4f61d2c | 1066 | struct fscrypt_name nm; |
1e51764a AB |
1067 | |
1068 | /* | |
1069 | * Budget request settings: new inode, new direntry and changing parent | |
1070 | * directory inode. | |
1071 | */ | |
1072 | ||
4cb2a01d | 1073 | dbg_gen("dent '%pd' in dir ino %lu", dentry, dir->i_ino); |
1e51764a | 1074 | |
1e51764a AB |
1075 | if (S_ISBLK(mode) || S_ISCHR(mode)) { |
1076 | dev = kmalloc(sizeof(union ubifs_dev_desc), GFP_NOFS); | |
1077 | if (!dev) | |
1078 | return -ENOMEM; | |
1079 | devlen = ubifs_encode_dev(dev, rdev); | |
1080 | } | |
1081 | ||
1082 | err = ubifs_budget_space(c, &req); | |
1083 | if (err) { | |
1084 | kfree(dev); | |
1085 | return err; | |
1086 | } | |
1087 | ||
f4f61d2c | 1088 | err = fscrypt_setup_filename(dir, &dentry->d_name, 0, &nm); |
63ed6573 RW |
1089 | if (err) { |
1090 | kfree(dev); | |
f4f61d2c | 1091 | goto out_budg; |
63ed6573 | 1092 | } |
f4f61d2c RW |
1093 | |
1094 | sz_change = CALC_DENT_SIZE(fname_len(&nm)); | |
1095 | ||
1e51764a AB |
1096 | inode = ubifs_new_inode(c, dir, mode); |
1097 | if (IS_ERR(inode)) { | |
1098 | kfree(dev); | |
1099 | err = PTR_ERR(inode); | |
f4f61d2c | 1100 | goto out_fname; |
1e51764a AB |
1101 | } |
1102 | ||
1103 | init_special_inode(inode, inode->i_mode, rdev); | |
1104 | inode->i_size = ubifs_inode(inode)->ui_size = devlen; | |
1105 | ui = ubifs_inode(inode); | |
1106 | ui->data = dev; | |
1107 | ui->data_len = devlen; | |
1108 | ||
d7f0b70d SN |
1109 | err = ubifs_init_security(dir, inode, &dentry->d_name); |
1110 | if (err) | |
9401a795 | 1111 | goto out_inode; |
d7f0b70d | 1112 | |
1e51764a AB |
1113 | mutex_lock(&dir_ui->ui_mutex); |
1114 | dir->i_size += sz_change; | |
1115 | dir_ui->ui_size = dir->i_size; | |
1116 | dir->i_mtime = dir->i_ctime = inode->i_ctime; | |
f4f61d2c | 1117 | err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0); |
1e51764a AB |
1118 | if (err) |
1119 | goto out_cancel; | |
1120 | mutex_unlock(&dir_ui->ui_mutex); | |
1121 | ||
1122 | ubifs_release_budget(c, &req); | |
1123 | insert_inode_hash(inode); | |
1124 | d_instantiate(dentry, inode); | |
f4f61d2c | 1125 | fscrypt_free_filename(&nm); |
1e51764a AB |
1126 | return 0; |
1127 | ||
1128 | out_cancel: | |
1129 | dir->i_size -= sz_change; | |
1130 | dir_ui->ui_size = dir->i_size; | |
1131 | mutex_unlock(&dir_ui->ui_mutex); | |
9401a795 | 1132 | out_inode: |
1e51764a AB |
1133 | make_bad_inode(inode); |
1134 | iput(inode); | |
f4f61d2c RW |
1135 | out_fname: |
1136 | fscrypt_free_filename(&nm); | |
1e51764a AB |
1137 | out_budg: |
1138 | ubifs_release_budget(c, &req); | |
1139 | return err; | |
1140 | } | |
1141 | ||
1142 | static int ubifs_symlink(struct inode *dir, struct dentry *dentry, | |
1143 | const char *symname) | |
1144 | { | |
1145 | struct inode *inode; | |
1146 | struct ubifs_inode *ui; | |
1147 | struct ubifs_inode *dir_ui = ubifs_inode(dir); | |
1148 | struct ubifs_info *c = dir->i_sb->s_fs_info; | |
1149 | int err, len = strlen(symname); | |
ca7f85be RW |
1150 | int sz_change = CALC_DENT_SIZE(len); |
1151 | struct fscrypt_str disk_link = FSTR_INIT((char *)symname, len + 1); | |
1152 | struct fscrypt_symlink_data *sd = NULL; | |
1e51764a | 1153 | struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1, |
dab4b4d2 AB |
1154 | .new_ino_d = ALIGN(len, 8), |
1155 | .dirtied_ino = 1 }; | |
ca7f85be RW |
1156 | struct fscrypt_name nm; |
1157 | ||
1158 | if (ubifs_crypt_is_encrypted(dir)) { | |
1159 | err = fscrypt_get_encryption_info(dir); | |
1160 | if (err) | |
1161 | goto out_budg; | |
1162 | ||
1163 | if (!fscrypt_has_encryption_key(dir)) { | |
1164 | err = -EPERM; | |
1165 | goto out_budg; | |
1166 | } | |
1167 | ||
1168 | disk_link.len = (fscrypt_fname_encrypted_size(dir, len) + | |
1169 | sizeof(struct fscrypt_symlink_data)); | |
1170 | } | |
1e51764a AB |
1171 | |
1172 | /* | |
1173 | * Budget request settings: new inode, new direntry and changing parent | |
1174 | * directory inode. | |
1175 | */ | |
1176 | ||
4cb2a01d AV |
1177 | dbg_gen("dent '%pd', target '%s' in dir ino %lu", dentry, |
1178 | symname, dir->i_ino); | |
1e51764a | 1179 | |
ca7f85be | 1180 | if (disk_link.len > UBIFS_MAX_INO_DATA) |
1e51764a AB |
1181 | return -ENAMETOOLONG; |
1182 | ||
1183 | err = ubifs_budget_space(c, &req); | |
1184 | if (err) | |
1185 | return err; | |
1186 | ||
ca7f85be RW |
1187 | err = fscrypt_setup_filename(dir, &dentry->d_name, 0, &nm); |
1188 | if (err) | |
1189 | goto out_budg; | |
1190 | ||
1e51764a AB |
1191 | inode = ubifs_new_inode(c, dir, S_IFLNK | S_IRWXUGO); |
1192 | if (IS_ERR(inode)) { | |
1193 | err = PTR_ERR(inode); | |
ca7f85be | 1194 | goto out_fname; |
1e51764a AB |
1195 | } |
1196 | ||
1197 | ui = ubifs_inode(inode); | |
ca7f85be | 1198 | ui->data = kmalloc(disk_link.len, GFP_NOFS); |
1e51764a AB |
1199 | if (!ui->data) { |
1200 | err = -ENOMEM; | |
1201 | goto out_inode; | |
1202 | } | |
1203 | ||
ca7f85be RW |
1204 | if (ubifs_crypt_is_encrypted(dir)) { |
1205 | struct qstr istr = QSTR_INIT(symname, len); | |
1206 | struct fscrypt_str ostr; | |
1207 | ||
1208 | sd = kzalloc(disk_link.len, GFP_NOFS); | |
1209 | if (!sd) { | |
1210 | err = -ENOMEM; | |
1211 | goto out_inode; | |
1212 | } | |
1213 | ||
ca7f85be RW |
1214 | ostr.name = sd->encrypted_path; |
1215 | ostr.len = disk_link.len; | |
1216 | ||
1217 | err = fscrypt_fname_usr_to_disk(inode, &istr, &ostr); | |
1218 | if (err) { | |
1219 | kfree(sd); | |
1220 | goto out_inode; | |
1221 | } | |
1222 | ||
1223 | sd->len = cpu_to_le16(ostr.len); | |
1224 | disk_link.name = (char *)sd; | |
1225 | } else { | |
1226 | inode->i_link = ui->data; | |
1227 | } | |
1228 | ||
1229 | memcpy(ui->data, disk_link.name, disk_link.len); | |
1230 | ((char *)ui->data)[disk_link.len - 1] = '\0'; | |
1231 | ||
1e51764a AB |
1232 | /* |
1233 | * The terminating zero byte is not written to the flash media and it | |
1234 | * is put just to make later in-memory string processing simpler. Thus, | |
1235 | * data length is @len, not @len + %1. | |
1236 | */ | |
ca7f85be RW |
1237 | ui->data_len = disk_link.len - 1; |
1238 | inode->i_size = ubifs_inode(inode)->ui_size = disk_link.len - 1; | |
1e51764a | 1239 | |
d7f0b70d SN |
1240 | err = ubifs_init_security(dir, inode, &dentry->d_name); |
1241 | if (err) | |
9401a795 | 1242 | goto out_inode; |
d7f0b70d | 1243 | |
1e51764a AB |
1244 | mutex_lock(&dir_ui->ui_mutex); |
1245 | dir->i_size += sz_change; | |
1246 | dir_ui->ui_size = dir->i_size; | |
1247 | dir->i_mtime = dir->i_ctime = inode->i_ctime; | |
ca7f85be | 1248 | err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0); |
1e51764a AB |
1249 | if (err) |
1250 | goto out_cancel; | |
1251 | mutex_unlock(&dir_ui->ui_mutex); | |
1252 | ||
1253 | ubifs_release_budget(c, &req); | |
1254 | insert_inode_hash(inode); | |
1255 | d_instantiate(dentry, inode); | |
ca7f85be | 1256 | fscrypt_free_filename(&nm); |
1e51764a AB |
1257 | return 0; |
1258 | ||
1259 | out_cancel: | |
1260 | dir->i_size -= sz_change; | |
1261 | dir_ui->ui_size = dir->i_size; | |
1262 | mutex_unlock(&dir_ui->ui_mutex); | |
1263 | out_inode: | |
1264 | make_bad_inode(inode); | |
1265 | iput(inode); | |
ca7f85be RW |
1266 | out_fname: |
1267 | fscrypt_free_filename(&nm); | |
1e51764a AB |
1268 | out_budg: |
1269 | ubifs_release_budget(c, &req); | |
1270 | return err; | |
1271 | } | |
1272 | ||
1273 | /** | |
9e0a1fff | 1274 | * lock_4_inodes - a wrapper for locking three UBIFS inodes. |
1e51764a AB |
1275 | * @inode1: first inode |
1276 | * @inode2: second inode | |
1277 | * @inode3: third inode | |
9e0a1fff | 1278 | * @inode4: fouth inode |
1e51764a | 1279 | * |
82c1593c | 1280 | * This function is used for 'ubifs_rename()' and @inode1 may be the same as |
9e0a1fff | 1281 | * @inode2 whereas @inode3 and @inode4 may be %NULL. |
82c1593c AB |
1282 | * |
1283 | * We do not implement any tricks to guarantee strict lock ordering, because | |
1284 | * VFS has already done it for us on the @i_mutex. So this is just a simple | |
1285 | * wrapper function. | |
1e51764a | 1286 | */ |
9e0a1fff RW |
1287 | static void lock_4_inodes(struct inode *inode1, struct inode *inode2, |
1288 | struct inode *inode3, struct inode *inode4) | |
1e51764a | 1289 | { |
82c1593c AB |
1290 | mutex_lock_nested(&ubifs_inode(inode1)->ui_mutex, WB_MUTEX_1); |
1291 | if (inode2 != inode1) | |
1292 | mutex_lock_nested(&ubifs_inode(inode2)->ui_mutex, WB_MUTEX_2); | |
1293 | if (inode3) | |
1294 | mutex_lock_nested(&ubifs_inode(inode3)->ui_mutex, WB_MUTEX_3); | |
9e0a1fff RW |
1295 | if (inode4) |
1296 | mutex_lock_nested(&ubifs_inode(inode4)->ui_mutex, WB_MUTEX_4); | |
1e51764a AB |
1297 | } |
1298 | ||
1299 | /** | |
9e0a1fff | 1300 | * unlock_4_inodes - a wrapper for unlocking three UBIFS inodes for rename. |
1e51764a AB |
1301 | * @inode1: first inode |
1302 | * @inode2: second inode | |
1303 | * @inode3: third inode | |
9e0a1fff | 1304 | * @inode4: fouth inode |
1e51764a | 1305 | */ |
9e0a1fff RW |
1306 | static void unlock_4_inodes(struct inode *inode1, struct inode *inode2, |
1307 | struct inode *inode3, struct inode *inode4) | |
1e51764a | 1308 | { |
9e0a1fff RW |
1309 | if (inode4) |
1310 | mutex_unlock(&ubifs_inode(inode4)->ui_mutex); | |
1e51764a AB |
1311 | if (inode3) |
1312 | mutex_unlock(&ubifs_inode(inode3)->ui_mutex); | |
82c1593c AB |
1313 | if (inode1 != inode2) |
1314 | mutex_unlock(&ubifs_inode(inode2)->ui_mutex); | |
1315 | mutex_unlock(&ubifs_inode(inode1)->ui_mutex); | |
1e51764a AB |
1316 | } |
1317 | ||
390975ac RW |
1318 | static int do_rename(struct inode *old_dir, struct dentry *old_dentry, |
1319 | struct inode *new_dir, struct dentry *new_dentry, | |
1320 | unsigned int flags) | |
1e51764a AB |
1321 | { |
1322 | struct ubifs_info *c = old_dir->i_sb->s_fs_info; | |
2b0143b5 DH |
1323 | struct inode *old_inode = d_inode(old_dentry); |
1324 | struct inode *new_inode = d_inode(new_dentry); | |
9e0a1fff | 1325 | struct inode *whiteout = NULL; |
1e51764a | 1326 | struct ubifs_inode *old_inode_ui = ubifs_inode(old_inode); |
9e0a1fff | 1327 | struct ubifs_inode *whiteout_ui = NULL; |
1e51764a AB |
1328 | int err, release, sync = 0, move = (new_dir != old_dir); |
1329 | int is_dir = S_ISDIR(old_inode->i_mode); | |
f4f61d2c | 1330 | int unlink = !!new_inode, new_sz, old_sz; |
1e51764a AB |
1331 | struct ubifs_budget_req req = { .new_dent = 1, .mod_dent = 1, |
1332 | .dirtied_ino = 3 }; | |
1333 | struct ubifs_budget_req ino_req = { .dirtied_ino = 1, | |
dab4b4d2 | 1334 | .dirtied_ino_d = ALIGN(old_inode_ui->data_len, 8) }; |
1e51764a | 1335 | struct timespec time; |
782759b9 | 1336 | unsigned int uninitialized_var(saved_nlink); |
f4f61d2c | 1337 | struct fscrypt_name old_nm, new_nm; |
1e51764a AB |
1338 | |
1339 | /* | |
1340 | * Budget request settings: deletion direntry, new direntry, removing | |
1341 | * the old inode, and changing old and new parent directory inodes. | |
1342 | * | |
1343 | * However, this operation also marks the target inode as dirty and | |
1344 | * does not write it, so we allocate budget for the target inode | |
1345 | * separately. | |
1346 | */ | |
1347 | ||
9e0a1fff | 1348 | dbg_gen("dent '%pd' ino %lu in dir ino %lu to dent '%pd' in dir ino %lu flags 0x%x", |
4cb2a01d | 1349 | old_dentry, old_inode->i_ino, old_dir->i_ino, |
9e0a1fff RW |
1350 | new_dentry, new_dir->i_ino, flags); |
1351 | ||
82c1593c | 1352 | if (unlink) |
5955102c | 1353 | ubifs_assert(inode_is_locked(new_inode)); |
82c1593c | 1354 | |
ac7e47a9 RW |
1355 | if (old_dir != new_dir) { |
1356 | if (ubifs_crypt_is_encrypted(new_dir) && | |
1357 | !fscrypt_has_permitted_context(new_dir, old_inode)) | |
1358 | return -EPERM; | |
1359 | } | |
1360 | ||
1e51764a | 1361 | if (unlink && is_dir) { |
f6337d84 | 1362 | err = ubifs_check_dir_empty(new_inode); |
1e51764a AB |
1363 | if (err) |
1364 | return err; | |
1365 | } | |
1366 | ||
f4f61d2c | 1367 | err = fscrypt_setup_filename(old_dir, &old_dentry->d_name, 0, &old_nm); |
1e51764a AB |
1368 | if (err) |
1369 | return err; | |
f4f61d2c RW |
1370 | |
1371 | err = fscrypt_setup_filename(new_dir, &new_dentry->d_name, 0, &new_nm); | |
1372 | if (err) { | |
1373 | fscrypt_free_filename(&old_nm); | |
1374 | return err; | |
1375 | } | |
1376 | ||
1377 | new_sz = CALC_DENT_SIZE(fname_len(&new_nm)); | |
1378 | old_sz = CALC_DENT_SIZE(fname_len(&old_nm)); | |
1379 | ||
1380 | err = ubifs_budget_space(c, &req); | |
1381 | if (err) { | |
1382 | fscrypt_free_filename(&old_nm); | |
1383 | fscrypt_free_filename(&new_nm); | |
1384 | return err; | |
1385 | } | |
1e51764a AB |
1386 | err = ubifs_budget_space(c, &ino_req); |
1387 | if (err) { | |
f4f61d2c RW |
1388 | fscrypt_free_filename(&old_nm); |
1389 | fscrypt_free_filename(&new_nm); | |
1e51764a AB |
1390 | ubifs_release_budget(c, &req); |
1391 | return err; | |
1392 | } | |
1393 | ||
9e0a1fff RW |
1394 | if (flags & RENAME_WHITEOUT) { |
1395 | union ubifs_dev_desc *dev = NULL; | |
1396 | ||
1397 | dev = kmalloc(sizeof(union ubifs_dev_desc), GFP_NOFS); | |
1398 | if (!dev) { | |
1399 | ubifs_release_budget(c, &req); | |
1400 | ubifs_release_budget(c, &ino_req); | |
1401 | return -ENOMEM; | |
1402 | } | |
1403 | ||
1404 | err = do_tmpfile(old_dir, old_dentry, S_IFCHR | WHITEOUT_MODE, &whiteout); | |
1405 | if (err) { | |
1406 | ubifs_release_budget(c, &req); | |
1407 | ubifs_release_budget(c, &ino_req); | |
1408 | kfree(dev); | |
1409 | return err; | |
1410 | } | |
1411 | ||
1412 | whiteout->i_state |= I_LINKABLE; | |
1413 | whiteout_ui = ubifs_inode(whiteout); | |
1414 | whiteout_ui->data = dev; | |
1415 | whiteout_ui->data_len = ubifs_encode_dev(dev, MKDEV(0, 0)); | |
1416 | ubifs_assert(!whiteout_ui->dirty); | |
1417 | } | |
1418 | ||
1419 | lock_4_inodes(old_dir, new_dir, new_inode, whiteout); | |
1e51764a AB |
1420 | |
1421 | /* | |
1422 | * Like most other Unix systems, set the @i_ctime for inodes on a | |
1423 | * rename. | |
1424 | */ | |
607a11ad | 1425 | time = current_time(old_dir); |
1e51764a AB |
1426 | old_inode->i_ctime = time; |
1427 | ||
1428 | /* We must adjust parent link count when renaming directories */ | |
1429 | if (is_dir) { | |
1430 | if (move) { | |
1431 | /* | |
1432 | * @old_dir loses a link because we are moving | |
1433 | * @old_inode to a different directory. | |
1434 | */ | |
1435 | drop_nlink(old_dir); | |
1436 | /* | |
1437 | * @new_dir only gains a link if we are not also | |
1438 | * overwriting an existing directory. | |
1439 | */ | |
1440 | if (!unlink) | |
1441 | inc_nlink(new_dir); | |
1442 | } else { | |
1443 | /* | |
1444 | * @old_inode is not moving to a different directory, | |
1445 | * but @old_dir still loses a link if we are | |
1446 | * overwriting an existing directory. | |
1447 | */ | |
1448 | if (unlink) | |
1449 | drop_nlink(old_dir); | |
1450 | } | |
1451 | } | |
1452 | ||
1453 | old_dir->i_size -= old_sz; | |
1454 | ubifs_inode(old_dir)->ui_size = old_dir->i_size; | |
1455 | old_dir->i_mtime = old_dir->i_ctime = time; | |
1456 | new_dir->i_mtime = new_dir->i_ctime = time; | |
1457 | ||
1458 | /* | |
1459 | * And finally, if we unlinked a direntry which happened to have the | |
1460 | * same name as the moved direntry, we have to decrement @i_nlink of | |
1461 | * the unlinked inode and change its ctime. | |
1462 | */ | |
1463 | if (unlink) { | |
1464 | /* | |
1465 | * Directories cannot have hard-links, so if this is a | |
c43be108 | 1466 | * directory, just clear @i_nlink. |
1e51764a | 1467 | */ |
c43be108 | 1468 | saved_nlink = new_inode->i_nlink; |
1e51764a | 1469 | if (is_dir) |
c43be108 AB |
1470 | clear_nlink(new_inode); |
1471 | else | |
1e51764a AB |
1472 | drop_nlink(new_inode); |
1473 | new_inode->i_ctime = time; | |
1e51764a AB |
1474 | } else { |
1475 | new_dir->i_size += new_sz; | |
1476 | ubifs_inode(new_dir)->ui_size = new_dir->i_size; | |
1477 | } | |
1478 | ||
1479 | /* | |
1480 | * Do not ask 'ubifs_jnl_rename()' to flush write-buffer if @old_inode | |
1481 | * is dirty, because this will be done later on at the end of | |
1482 | * 'ubifs_rename()'. | |
1483 | */ | |
1484 | if (IS_SYNC(old_inode)) { | |
1485 | sync = IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir); | |
1486 | if (unlink && IS_SYNC(new_inode)) | |
1487 | sync = 1; | |
1488 | } | |
9e0a1fff RW |
1489 | |
1490 | if (whiteout) { | |
1491 | struct ubifs_budget_req wht_req = { .dirtied_ino = 1, | |
1492 | .dirtied_ino_d = \ | |
1493 | ALIGN(ubifs_inode(whiteout)->data_len, 8) }; | |
1494 | ||
1495 | err = ubifs_budget_space(c, &wht_req); | |
1496 | if (err) { | |
1497 | ubifs_release_budget(c, &req); | |
1498 | ubifs_release_budget(c, &ino_req); | |
1499 | kfree(whiteout_ui->data); | |
1500 | whiteout_ui->data_len = 0; | |
1501 | iput(whiteout); | |
1502 | return err; | |
1503 | } | |
1504 | ||
1505 | inc_nlink(whiteout); | |
1506 | mark_inode_dirty(whiteout); | |
1507 | whiteout->i_state &= ~I_LINKABLE; | |
1508 | iput(whiteout); | |
1509 | } | |
1510 | ||
f4f61d2c RW |
1511 | err = ubifs_jnl_rename(c, old_dir, old_inode, &old_nm, new_dir, |
1512 | new_inode, &new_nm, whiteout, sync); | |
1e51764a AB |
1513 | if (err) |
1514 | goto out_cancel; | |
1515 | ||
9e0a1fff | 1516 | unlock_4_inodes(old_dir, new_dir, new_inode, whiteout); |
1e51764a AB |
1517 | ubifs_release_budget(c, &req); |
1518 | ||
1519 | mutex_lock(&old_inode_ui->ui_mutex); | |
1520 | release = old_inode_ui->dirty; | |
1521 | mark_inode_dirty_sync(old_inode); | |
1522 | mutex_unlock(&old_inode_ui->ui_mutex); | |
1523 | ||
1524 | if (release) | |
1525 | ubifs_release_budget(c, &ino_req); | |
1526 | if (IS_SYNC(old_inode)) | |
a9185b41 | 1527 | err = old_inode->i_sb->s_op->write_inode(old_inode, NULL); |
f4f61d2c RW |
1528 | |
1529 | fscrypt_free_filename(&old_nm); | |
1530 | fscrypt_free_filename(&new_nm); | |
1e51764a AB |
1531 | return err; |
1532 | ||
1533 | out_cancel: | |
1534 | if (unlink) { | |
c43be108 | 1535 | set_nlink(new_inode, saved_nlink); |
1e51764a AB |
1536 | } else { |
1537 | new_dir->i_size -= new_sz; | |
1538 | ubifs_inode(new_dir)->ui_size = new_dir->i_size; | |
1539 | } | |
1540 | old_dir->i_size += old_sz; | |
1541 | ubifs_inode(old_dir)->ui_size = old_dir->i_size; | |
1542 | if (is_dir) { | |
1543 | if (move) { | |
1544 | inc_nlink(old_dir); | |
1545 | if (!unlink) | |
1546 | drop_nlink(new_dir); | |
1547 | } else { | |
1548 | if (unlink) | |
1549 | inc_nlink(old_dir); | |
1550 | } | |
1551 | } | |
9e0a1fff RW |
1552 | if (whiteout) { |
1553 | drop_nlink(whiteout); | |
1554 | iput(whiteout); | |
1555 | } | |
1556 | unlock_4_inodes(old_dir, new_dir, new_inode, whiteout); | |
1e51764a AB |
1557 | ubifs_release_budget(c, &ino_req); |
1558 | ubifs_release_budget(c, &req); | |
f4f61d2c RW |
1559 | fscrypt_free_filename(&old_nm); |
1560 | fscrypt_free_filename(&new_nm); | |
1e51764a AB |
1561 | return err; |
1562 | } | |
1563 | ||
9ec64962 RW |
1564 | static int ubifs_xrename(struct inode *old_dir, struct dentry *old_dentry, |
1565 | struct inode *new_dir, struct dentry *new_dentry) | |
1566 | { | |
1567 | struct ubifs_info *c = old_dir->i_sb->s_fs_info; | |
1568 | struct ubifs_budget_req req = { .new_dent = 1, .mod_dent = 1, | |
1569 | .dirtied_ino = 2 }; | |
1570 | int sync = IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir); | |
1571 | struct inode *fst_inode = d_inode(old_dentry); | |
1572 | struct inode *snd_inode = d_inode(new_dentry); | |
1573 | struct timespec time; | |
1574 | int err; | |
f4f61d2c | 1575 | struct fscrypt_name fst_nm, snd_nm; |
9ec64962 RW |
1576 | |
1577 | ubifs_assert(fst_inode && snd_inode); | |
1578 | ||
ac7e47a9 RW |
1579 | if ((ubifs_crypt_is_encrypted(old_dir) || |
1580 | ubifs_crypt_is_encrypted(new_dir)) && | |
1581 | (old_dir != new_dir) && | |
1582 | (!fscrypt_has_permitted_context(new_dir, fst_inode) || | |
1583 | !fscrypt_has_permitted_context(old_dir, snd_inode))) | |
1584 | return -EPERM; | |
1585 | ||
f4f61d2c RW |
1586 | err = fscrypt_setup_filename(old_dir, &old_dentry->d_name, 0, &fst_nm); |
1587 | if (err) | |
1588 | return err; | |
1589 | ||
1590 | err = fscrypt_setup_filename(new_dir, &new_dentry->d_name, 0, &snd_nm); | |
1591 | if (err) { | |
1592 | fscrypt_free_filename(&fst_nm); | |
1593 | return err; | |
1594 | } | |
1595 | ||
9ec64962 RW |
1596 | lock_4_inodes(old_dir, new_dir, NULL, NULL); |
1597 | ||
607a11ad | 1598 | time = current_time(old_dir); |
9ec64962 RW |
1599 | fst_inode->i_ctime = time; |
1600 | snd_inode->i_ctime = time; | |
1601 | old_dir->i_mtime = old_dir->i_ctime = time; | |
1602 | new_dir->i_mtime = new_dir->i_ctime = time; | |
1603 | ||
1604 | if (old_dir != new_dir) { | |
1605 | if (S_ISDIR(fst_inode->i_mode) && !S_ISDIR(snd_inode->i_mode)) { | |
1606 | inc_nlink(new_dir); | |
1607 | drop_nlink(old_dir); | |
1608 | } | |
1609 | else if (!S_ISDIR(fst_inode->i_mode) && S_ISDIR(snd_inode->i_mode)) { | |
1610 | drop_nlink(new_dir); | |
1611 | inc_nlink(old_dir); | |
1612 | } | |
1613 | } | |
1614 | ||
f4f61d2c RW |
1615 | err = ubifs_jnl_xrename(c, old_dir, fst_inode, &fst_nm, new_dir, |
1616 | snd_inode, &snd_nm, sync); | |
9ec64962 RW |
1617 | |
1618 | unlock_4_inodes(old_dir, new_dir, NULL, NULL); | |
1619 | ubifs_release_budget(c, &req); | |
1620 | ||
f4f61d2c RW |
1621 | fscrypt_free_filename(&fst_nm); |
1622 | fscrypt_free_filename(&snd_nm); | |
9ec64962 RW |
1623 | return err; |
1624 | } | |
1625 | ||
390975ac | 1626 | static int ubifs_rename(struct inode *old_dir, struct dentry *old_dentry, |
9ec64962 RW |
1627 | struct inode *new_dir, struct dentry *new_dentry, |
1628 | unsigned int flags) | |
1629 | { | |
1630 | if (flags & ~(RENAME_NOREPLACE | RENAME_WHITEOUT | RENAME_EXCHANGE)) | |
1631 | return -EINVAL; | |
1632 | ||
1633 | ubifs_assert(inode_is_locked(old_dir)); | |
1634 | ubifs_assert(inode_is_locked(new_dir)); | |
1635 | ||
1636 | if (flags & RENAME_EXCHANGE) | |
1637 | return ubifs_xrename(old_dir, old_dentry, new_dir, new_dentry); | |
1638 | ||
390975ac | 1639 | return do_rename(old_dir, old_dentry, new_dir, new_dentry, flags); |
9ec64962 RW |
1640 | } |
1641 | ||
a528d35e DH |
1642 | int ubifs_getattr(const struct path *path, struct kstat *stat, |
1643 | u32 request_mask, unsigned int flags) | |
1e51764a AB |
1644 | { |
1645 | loff_t size; | |
a528d35e | 1646 | struct inode *inode = d_inode(path->dentry); |
1e51764a AB |
1647 | struct ubifs_inode *ui = ubifs_inode(inode); |
1648 | ||
1649 | mutex_lock(&ui->ui_mutex); | |
6d42e7e9 | 1650 | generic_fillattr(inode, stat); |
1e51764a AB |
1651 | stat->blksize = UBIFS_BLOCK_SIZE; |
1652 | stat->size = ui->ui_size; | |
1653 | ||
1654 | /* | |
1655 | * Unfortunately, the 'stat()' system call was designed for block | |
1656 | * device based file systems, and it is not appropriate for UBIFS, | |
1657 | * because UBIFS does not have notion of "block". For example, it is | |
1658 | * difficult to tell how many block a directory takes - it actually | |
1659 | * takes less than 300 bytes, but we have to round it to block size, | |
1660 | * which introduces large mistake. This makes utilities like 'du' to | |
1661 | * report completely senseless numbers. This is the reason why UBIFS | |
1662 | * goes the same way as JFFS2 - it reports zero blocks for everything | |
1663 | * but regular files, which makes more sense than reporting completely | |
1664 | * wrong sizes. | |
1665 | */ | |
1666 | if (S_ISREG(inode->i_mode)) { | |
1667 | size = ui->xattr_size; | |
1668 | size += stat->size; | |
1669 | size = ALIGN(size, UBIFS_BLOCK_SIZE); | |
1670 | /* | |
1671 | * Note, user-space expects 512-byte blocks count irrespectively | |
1672 | * of what was reported in @stat->size. | |
1673 | */ | |
1674 | stat->blocks = size >> 9; | |
1675 | } else | |
1676 | stat->blocks = 0; | |
1677 | mutex_unlock(&ui->ui_mutex); | |
1678 | return 0; | |
1679 | } | |
1680 | ||
ba40e6a3 RW |
1681 | static int ubifs_dir_open(struct inode *dir, struct file *file) |
1682 | { | |
1683 | if (ubifs_crypt_is_encrypted(dir)) | |
1684 | return fscrypt_get_encryption_info(dir) ? -EACCES : 0; | |
1685 | ||
1686 | return 0; | |
1687 | } | |
1688 | ||
e8b81566 | 1689 | const struct inode_operations ubifs_dir_inode_operations = { |
1e51764a AB |
1690 | .lookup = ubifs_lookup, |
1691 | .create = ubifs_create, | |
1692 | .link = ubifs_link, | |
1693 | .symlink = ubifs_symlink, | |
1694 | .unlink = ubifs_unlink, | |
1695 | .mkdir = ubifs_mkdir, | |
1696 | .rmdir = ubifs_rmdir, | |
1697 | .mknod = ubifs_mknod, | |
390975ac | 1698 | .rename = ubifs_rename, |
1e51764a AB |
1699 | .setattr = ubifs_setattr, |
1700 | .getattr = ubifs_getattr, | |
1e51764a | 1701 | .listxattr = ubifs_listxattr, |
8c1c5f26 DY |
1702 | #ifdef CONFIG_UBIFS_ATIME_SUPPORT |
1703 | .update_time = ubifs_update_time, | |
1704 | #endif | |
474b9370 | 1705 | .tmpfile = ubifs_tmpfile, |
1e51764a AB |
1706 | }; |
1707 | ||
e8b81566 | 1708 | const struct file_operations ubifs_dir_operations = { |
01122e06 | 1709 | .llseek = generic_file_llseek, |
1e51764a AB |
1710 | .release = ubifs_dir_release, |
1711 | .read = generic_read_dir, | |
c51da20c | 1712 | .iterate_shared = ubifs_readdir, |
1e51764a AB |
1713 | .fsync = ubifs_fsync, |
1714 | .unlocked_ioctl = ubifs_ioctl, | |
ba40e6a3 | 1715 | .open = ubifs_dir_open, |
1e51764a AB |
1716 | #ifdef CONFIG_COMPAT |
1717 | .compat_ioctl = ubifs_compat_ioctl, | |
1718 | #endif | |
1719 | }; |