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; | |
217 | struct ubifs_dent_node *dent; | |
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) { | |
232 | err = -ENAMETOOLONG; | |
233 | goto out_fname; | |
234 | } | |
1e51764a AB |
235 | |
236 | dent = kmalloc(UBIFS_MAX_DENT_NODE_SZ, GFP_NOFS); | |
f4f61d2c RW |
237 | if (!dent) { |
238 | err = -ENOMEM; | |
239 | goto out_fname; | |
240 | } | |
1e51764a | 241 | |
f4f61d2c RW |
242 | if (nm.hash) { |
243 | ubifs_assert(fname_len(&nm) == 0); | |
244 | ubifs_assert(fname_name(&nm) == NULL); | |
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) { |
720b499c | 253 | if (err == -ENOENT) { |
1e51764a AB |
254 | dbg_gen("not found"); |
255 | goto done; | |
256 | } | |
f4f61d2c | 257 | goto out_dent; |
1e51764a AB |
258 | } |
259 | ||
f4f61d2c | 260 | if (dbg_check_name(c, dent, &nm)) { |
1e51764a | 261 | err = -EINVAL; |
f4f61d2c | 262 | goto out_dent; |
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); |
f4f61d2c | 275 | goto out_dent; |
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); | |
283 | err = -EPERM; | |
284 | goto out_inode; | |
285 | } | |
286 | ||
1e51764a AB |
287 | done: |
288 | kfree(dent); | |
f4f61d2c | 289 | fscrypt_free_filename(&nm); |
1e51764a AB |
290 | /* |
291 | * Note, d_splice_alias() would be required instead if we supported | |
292 | * NFS. | |
293 | */ | |
294 | d_add(dentry, inode); | |
295 | return NULL; | |
296 | ||
413d5a9e EB |
297 | out_inode: |
298 | iput(inode); | |
f4f61d2c | 299 | out_dent: |
1e51764a | 300 | kfree(dent); |
f4f61d2c RW |
301 | out_fname: |
302 | fscrypt_free_filename(&nm); | |
1e51764a AB |
303 | return ERR_PTR(err); |
304 | } | |
305 | ||
4acdaf27 | 306 | static int ubifs_create(struct inode *dir, struct dentry *dentry, umode_t mode, |
ebfc3b49 | 307 | bool excl) |
1e51764a AB |
308 | { |
309 | struct inode *inode; | |
310 | struct ubifs_info *c = dir->i_sb->s_fs_info; | |
1e51764a AB |
311 | struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1, |
312 | .dirtied_ino = 1 }; | |
313 | struct ubifs_inode *dir_ui = ubifs_inode(dir); | |
f4f61d2c RW |
314 | struct fscrypt_name nm; |
315 | int err, sz_change; | |
1e51764a AB |
316 | |
317 | /* | |
318 | * Budget request settings: new inode, new direntry, changing the | |
319 | * parent directory inode. | |
320 | */ | |
321 | ||
4cb2a01d AV |
322 | dbg_gen("dent '%pd', mode %#hx in dir ino %lu", |
323 | dentry, mode, dir->i_ino); | |
1e51764a AB |
324 | |
325 | err = ubifs_budget_space(c, &req); | |
326 | if (err) | |
327 | return err; | |
328 | ||
f4f61d2c RW |
329 | err = fscrypt_setup_filename(dir, &dentry->d_name, 0, &nm); |
330 | if (err) | |
331 | goto out_budg; | |
332 | ||
333 | sz_change = CALC_DENT_SIZE(fname_len(&nm)); | |
334 | ||
1e51764a AB |
335 | inode = ubifs_new_inode(c, dir, mode); |
336 | if (IS_ERR(inode)) { | |
337 | err = PTR_ERR(inode); | |
f4f61d2c | 338 | goto out_fname; |
1e51764a AB |
339 | } |
340 | ||
d7f0b70d SN |
341 | err = ubifs_init_security(dir, inode, &dentry->d_name); |
342 | if (err) | |
9401a795 | 343 | goto out_inode; |
d7f0b70d | 344 | |
1e51764a AB |
345 | mutex_lock(&dir_ui->ui_mutex); |
346 | dir->i_size += sz_change; | |
347 | dir_ui->ui_size = dir->i_size; | |
348 | dir->i_mtime = dir->i_ctime = inode->i_ctime; | |
f4f61d2c | 349 | err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0); |
1e51764a AB |
350 | if (err) |
351 | goto out_cancel; | |
352 | mutex_unlock(&dir_ui->ui_mutex); | |
353 | ||
354 | ubifs_release_budget(c, &req); | |
f4f61d2c | 355 | fscrypt_free_filename(&nm); |
1e51764a AB |
356 | insert_inode_hash(inode); |
357 | d_instantiate(dentry, inode); | |
358 | return 0; | |
359 | ||
360 | out_cancel: | |
361 | dir->i_size -= sz_change; | |
362 | dir_ui->ui_size = dir->i_size; | |
363 | mutex_unlock(&dir_ui->ui_mutex); | |
9401a795 | 364 | out_inode: |
1e51764a AB |
365 | make_bad_inode(inode); |
366 | iput(inode); | |
f4f61d2c RW |
367 | out_fname: |
368 | fscrypt_free_filename(&nm); | |
1e51764a AB |
369 | out_budg: |
370 | ubifs_release_budget(c, &req); | |
235c362b | 371 | ubifs_err(c, "cannot create regular file, error %d", err); |
1e51764a AB |
372 | return err; |
373 | } | |
374 | ||
9e0a1fff RW |
375 | static int do_tmpfile(struct inode *dir, struct dentry *dentry, |
376 | umode_t mode, struct inode **whiteout) | |
474b9370 RW |
377 | { |
378 | struct inode *inode; | |
379 | struct ubifs_info *c = dir->i_sb->s_fs_info; | |
380 | struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1}; | |
381 | struct ubifs_budget_req ino_req = { .dirtied_ino = 1 }; | |
382 | struct ubifs_inode *ui, *dir_ui = ubifs_inode(dir); | |
383 | int err, instantiated = 0; | |
f4f61d2c | 384 | struct fscrypt_name nm; |
474b9370 RW |
385 | |
386 | /* | |
387 | * Budget request settings: new dirty inode, new direntry, | |
388 | * budget for dirtied inode will be released via writeback. | |
389 | */ | |
390 | ||
391 | dbg_gen("dent '%pd', mode %#hx in dir ino %lu", | |
392 | dentry, mode, dir->i_ino); | |
393 | ||
f4f61d2c | 394 | err = fscrypt_setup_filename(dir, &dentry->d_name, 0, &nm); |
474b9370 RW |
395 | if (err) |
396 | return err; | |
397 | ||
f4f61d2c RW |
398 | err = ubifs_budget_space(c, &req); |
399 | if (err) { | |
400 | fscrypt_free_filename(&nm); | |
401 | return err; | |
402 | } | |
403 | ||
474b9370 RW |
404 | err = ubifs_budget_space(c, &ino_req); |
405 | if (err) { | |
406 | ubifs_release_budget(c, &req); | |
f4f61d2c | 407 | fscrypt_free_filename(&nm); |
474b9370 RW |
408 | return err; |
409 | } | |
410 | ||
411 | inode = ubifs_new_inode(c, dir, mode); | |
412 | if (IS_ERR(inode)) { | |
413 | err = PTR_ERR(inode); | |
414 | goto out_budg; | |
415 | } | |
416 | ui = ubifs_inode(inode); | |
417 | ||
9e0a1fff RW |
418 | if (whiteout) { |
419 | init_special_inode(inode, inode->i_mode, WHITEOUT_DEV); | |
420 | ubifs_assert(inode->i_op == &ubifs_file_inode_operations); | |
421 | } | |
422 | ||
474b9370 RW |
423 | err = ubifs_init_security(dir, inode, &dentry->d_name); |
424 | if (err) | |
425 | goto out_inode; | |
426 | ||
427 | mutex_lock(&ui->ui_mutex); | |
428 | insert_inode_hash(inode); | |
9e0a1fff RW |
429 | |
430 | if (whiteout) { | |
431 | mark_inode_dirty(inode); | |
432 | drop_nlink(inode); | |
433 | *whiteout = inode; | |
434 | } else { | |
435 | d_tmpfile(dentry, inode); | |
436 | } | |
474b9370 | 437 | ubifs_assert(ui->dirty); |
9e0a1fff | 438 | |
474b9370 RW |
439 | instantiated = 1; |
440 | mutex_unlock(&ui->ui_mutex); | |
441 | ||
442 | mutex_lock(&dir_ui->ui_mutex); | |
f4f61d2c | 443 | err = ubifs_jnl_update(c, dir, &nm, inode, 1, 0); |
474b9370 RW |
444 | if (err) |
445 | goto out_cancel; | |
446 | mutex_unlock(&dir_ui->ui_mutex); | |
447 | ||
448 | ubifs_release_budget(c, &req); | |
449 | ||
450 | return 0; | |
451 | ||
452 | out_cancel: | |
453 | mutex_unlock(&dir_ui->ui_mutex); | |
454 | out_inode: | |
455 | make_bad_inode(inode); | |
456 | if (!instantiated) | |
457 | iput(inode); | |
458 | out_budg: | |
459 | ubifs_release_budget(c, &req); | |
460 | if (!instantiated) | |
461 | ubifs_release_budget(c, &ino_req); | |
f4f61d2c | 462 | fscrypt_free_filename(&nm); |
474b9370 RW |
463 | ubifs_err(c, "cannot create temporary file, error %d", err); |
464 | return err; | |
465 | } | |
466 | ||
9e0a1fff RW |
467 | static int ubifs_tmpfile(struct inode *dir, struct dentry *dentry, |
468 | umode_t mode) | |
469 | { | |
470 | return do_tmpfile(dir, dentry, mode, NULL); | |
471 | } | |
472 | ||
1e51764a AB |
473 | /** |
474 | * vfs_dent_type - get VFS directory entry type. | |
475 | * @type: UBIFS directory entry type | |
476 | * | |
477 | * This function converts UBIFS directory entry type into VFS directory entry | |
478 | * type. | |
479 | */ | |
480 | static unsigned int vfs_dent_type(uint8_t type) | |
481 | { | |
482 | switch (type) { | |
483 | case UBIFS_ITYPE_REG: | |
484 | return DT_REG; | |
485 | case UBIFS_ITYPE_DIR: | |
486 | return DT_DIR; | |
487 | case UBIFS_ITYPE_LNK: | |
488 | return DT_LNK; | |
489 | case UBIFS_ITYPE_BLK: | |
490 | return DT_BLK; | |
491 | case UBIFS_ITYPE_CHR: | |
492 | return DT_CHR; | |
493 | case UBIFS_ITYPE_FIFO: | |
494 | return DT_FIFO; | |
495 | case UBIFS_ITYPE_SOCK: | |
496 | return DT_SOCK; | |
497 | default: | |
498 | BUG(); | |
499 | } | |
500 | return 0; | |
501 | } | |
502 | ||
503 | /* | |
504 | * The classical Unix view for directory is that it is a linear array of | |
505 | * (name, inode number) entries. Linux/VFS assumes this model as well. | |
506 | * Particularly, 'readdir()' call wants us to return a directory entry offset | |
507 | * which later may be used to continue 'readdir()'ing the directory or to | |
508 | * 'seek()' to that specific direntry. Obviously UBIFS does not really fit this | |
509 | * model because directory entries are identified by keys, which may collide. | |
510 | * | |
511 | * UBIFS uses directory entry hash value for directory offsets, so | |
512 | * 'seekdir()'/'telldir()' may not always work because of possible key | |
513 | * collisions. But UBIFS guarantees that consecutive 'readdir()' calls work | |
514 | * properly by means of saving full directory entry name in the private field | |
515 | * of the file description object. | |
516 | * | |
517 | * This means that UBIFS cannot support NFS which requires full | |
518 | * 'seekdir()'/'telldir()' support. | |
519 | */ | |
01122e06 | 520 | static int ubifs_readdir(struct file *file, struct dir_context *ctx) |
1e51764a | 521 | { |
ba75d570 | 522 | int fstr_real_len = 0, err = 0; |
f4f61d2c RW |
523 | struct fscrypt_name nm; |
524 | struct fscrypt_str fstr = {0}; | |
1e51764a AB |
525 | union ubifs_key key; |
526 | struct ubifs_dent_node *dent; | |
496ad9aa | 527 | struct inode *dir = file_inode(file); |
1e51764a | 528 | struct ubifs_info *c = dir->i_sb->s_fs_info; |
f4f61d2c | 529 | bool encrypted = ubifs_crypt_is_encrypted(dir); |
1e51764a | 530 | |
01122e06 | 531 | dbg_gen("dir ino %lu, f_pos %#llx", dir->i_ino, ctx->pos); |
1e51764a | 532 | |
01122e06 | 533 | if (ctx->pos > UBIFS_S_KEY_HASH_MASK || ctx->pos == 2) |
1e51764a AB |
534 | /* |
535 | * The directory was seek'ed to a senseless position or there | |
536 | * are no more entries. | |
537 | */ | |
538 | return 0; | |
539 | ||
f4f61d2c RW |
540 | if (encrypted) { |
541 | err = fscrypt_get_encryption_info(dir); | |
542 | if (err && err != -ENOKEY) | |
543 | return err; | |
544 | ||
545 | err = fscrypt_fname_alloc_buffer(dir, UBIFS_MAX_NLEN, &fstr); | |
546 | if (err) | |
547 | return err; | |
548 | ||
549 | fstr_real_len = fstr.len; | |
550 | } | |
551 | ||
605c912b AB |
552 | if (file->f_version == 0) { |
553 | /* | |
554 | * The file was seek'ed, which means that @file->private_data | |
555 | * is now invalid. This may also be just the first | |
556 | * 'ubifs_readdir()' invocation, in which case | |
557 | * @file->private_data is NULL, and the below code is | |
558 | * basically a no-op. | |
559 | */ | |
560 | kfree(file->private_data); | |
561 | file->private_data = NULL; | |
562 | } | |
563 | ||
564 | /* | |
565 | * 'generic_file_llseek()' unconditionally sets @file->f_version to | |
566 | * zero, and we use this for detecting whether the file was seek'ed. | |
567 | */ | |
568 | file->f_version = 1; | |
569 | ||
1e51764a | 570 | /* File positions 0 and 1 correspond to "." and ".." */ |
01122e06 | 571 | if (ctx->pos < 2) { |
1e51764a | 572 | ubifs_assert(!file->private_data); |
f4f61d2c RW |
573 | if (!dir_emit_dots(file, ctx)) { |
574 | if (encrypted) | |
575 | fscrypt_fname_free_buffer(&fstr); | |
1e51764a | 576 | return 0; |
f4f61d2c | 577 | } |
1e51764a AB |
578 | |
579 | /* Find the first entry in TNC and save it */ | |
580 | lowest_dent_key(c, &key, dir->i_ino); | |
f4f61d2c | 581 | fname_len(&nm) = 0; |
1e51764a AB |
582 | dent = ubifs_tnc_next_ent(c, &key, &nm); |
583 | if (IS_ERR(dent)) { | |
584 | err = PTR_ERR(dent); | |
585 | goto out; | |
586 | } | |
587 | ||
01122e06 | 588 | ctx->pos = key_hash_flash(c, &dent->key); |
1e51764a AB |
589 | file->private_data = dent; |
590 | } | |
591 | ||
592 | dent = file->private_data; | |
593 | if (!dent) { | |
594 | /* | |
595 | * The directory was seek'ed to and is now readdir'ed. | |
01122e06 | 596 | * Find the entry corresponding to @ctx->pos or the closest one. |
1e51764a | 597 | */ |
01122e06 | 598 | dent_key_init_hash(c, &key, dir->i_ino, ctx->pos); |
f4f61d2c | 599 | fname_len(&nm) = 0; |
1e51764a AB |
600 | dent = ubifs_tnc_next_ent(c, &key, &nm); |
601 | if (IS_ERR(dent)) { | |
602 | err = PTR_ERR(dent); | |
603 | goto out; | |
604 | } | |
01122e06 | 605 | ctx->pos = key_hash_flash(c, &dent->key); |
1e51764a AB |
606 | file->private_data = dent; |
607 | } | |
608 | ||
609 | while (1) { | |
b20e2d99 HL |
610 | dbg_gen("ino %llu, new f_pos %#x", |
611 | (unsigned long long)le64_to_cpu(dent->inum), | |
1e51764a | 612 | key_hash_flash(c, &dent->key)); |
0ecb9529 HH |
613 | ubifs_assert(le64_to_cpu(dent->ch.sqnum) > |
614 | ubifs_inode(dir)->creat_sqnum); | |
1e51764a | 615 | |
f4f61d2c RW |
616 | fname_len(&nm) = le16_to_cpu(dent->nlen); |
617 | fname_name(&nm) = dent->name; | |
618 | ||
619 | if (encrypted) { | |
620 | fstr.len = fstr_real_len; | |
621 | ||
528e3d17 RW |
622 | err = fscrypt_fname_disk_to_usr(dir, key_hash_flash(c, |
623 | &dent->key), | |
624 | le32_to_cpu(dent->cookie), | |
625 | &nm.disk_name, &fstr); | |
ca7f85be | 626 | if (err) |
f4f61d2c RW |
627 | goto out; |
628 | } else { | |
629 | fstr.len = fname_len(&nm); | |
630 | fstr.name = fname_name(&nm); | |
631 | } | |
632 | ||
633 | if (!dir_emit(ctx, fstr.name, fstr.len, | |
1e51764a | 634 | le64_to_cpu(dent->inum), |
f4f61d2c RW |
635 | vfs_dent_type(dent->type))) { |
636 | if (encrypted) | |
637 | fscrypt_fname_free_buffer(&fstr); | |
1e51764a | 638 | return 0; |
f4f61d2c | 639 | } |
1e51764a AB |
640 | |
641 | /* Switch to the next entry */ | |
642 | key_read(c, &dent->key, &key); | |
1e51764a AB |
643 | dent = ubifs_tnc_next_ent(c, &key, &nm); |
644 | if (IS_ERR(dent)) { | |
645 | err = PTR_ERR(dent); | |
646 | goto out; | |
647 | } | |
648 | ||
649 | kfree(file->private_data); | |
01122e06 | 650 | ctx->pos = key_hash_flash(c, &dent->key); |
1e51764a AB |
651 | file->private_data = dent; |
652 | cond_resched(); | |
653 | } | |
654 | ||
655 | out: | |
aeeb14f7 RW |
656 | kfree(file->private_data); |
657 | file->private_data = NULL; | |
658 | ||
f4f61d2c RW |
659 | if (encrypted) |
660 | fscrypt_fname_free_buffer(&fstr); | |
661 | ||
c83ed4c9 | 662 | if (err != -ENOENT) |
235c362b | 663 | ubifs_err(c, "cannot find next direntry, error %d", err); |
a00052a2 RW |
664 | else |
665 | /* | |
666 | * -ENOENT is a non-fatal error in this context, the TNC uses | |
667 | * it to indicate that the cursor moved past the current directory | |
668 | * and readdir() has to stop. | |
669 | */ | |
670 | err = 0; | |
671 | ||
1e51764a | 672 | |
605c912b | 673 | /* 2 is a special value indicating that there are no more direntries */ |
01122e06 | 674 | ctx->pos = 2; |
c83ed4c9 | 675 | return err; |
1e51764a AB |
676 | } |
677 | ||
1e51764a AB |
678 | /* Free saved readdir() state when the directory is closed */ |
679 | static int ubifs_dir_release(struct inode *dir, struct file *file) | |
680 | { | |
681 | kfree(file->private_data); | |
682 | file->private_data = NULL; | |
683 | return 0; | |
684 | } | |
685 | ||
686 | /** | |
82c1593c | 687 | * lock_2_inodes - a wrapper for locking two UBIFS inodes. |
1e51764a AB |
688 | * @inode1: first inode |
689 | * @inode2: second inode | |
82c1593c AB |
690 | * |
691 | * We do not implement any tricks to guarantee strict lock ordering, because | |
692 | * VFS has already done it for us on the @i_mutex. So this is just a simple | |
693 | * wrapper function. | |
1e51764a AB |
694 | */ |
695 | static void lock_2_inodes(struct inode *inode1, struct inode *inode2) | |
696 | { | |
82c1593c AB |
697 | mutex_lock_nested(&ubifs_inode(inode1)->ui_mutex, WB_MUTEX_1); |
698 | mutex_lock_nested(&ubifs_inode(inode2)->ui_mutex, WB_MUTEX_2); | |
1e51764a AB |
699 | } |
700 | ||
701 | /** | |
82c1593c | 702 | * unlock_2_inodes - a wrapper for unlocking two UBIFS inodes. |
1e51764a AB |
703 | * @inode1: first inode |
704 | * @inode2: second inode | |
705 | */ | |
706 | static void unlock_2_inodes(struct inode *inode1, struct inode *inode2) | |
707 | { | |
1e51764a | 708 | mutex_unlock(&ubifs_inode(inode2)->ui_mutex); |
82c1593c | 709 | mutex_unlock(&ubifs_inode(inode1)->ui_mutex); |
1e51764a AB |
710 | } |
711 | ||
712 | static int ubifs_link(struct dentry *old_dentry, struct inode *dir, | |
713 | struct dentry *dentry) | |
714 | { | |
715 | struct ubifs_info *c = dir->i_sb->s_fs_info; | |
2b0143b5 | 716 | struct inode *inode = d_inode(old_dentry); |
1e51764a AB |
717 | struct ubifs_inode *ui = ubifs_inode(inode); |
718 | struct ubifs_inode *dir_ui = ubifs_inode(dir); | |
719 | int err, sz_change = CALC_DENT_SIZE(dentry->d_name.len); | |
720 | struct ubifs_budget_req req = { .new_dent = 1, .dirtied_ino = 2, | |
dab4b4d2 | 721 | .dirtied_ino_d = ALIGN(ui->data_len, 8) }; |
f4f61d2c | 722 | struct fscrypt_name nm; |
1e51764a AB |
723 | |
724 | /* | |
725 | * Budget request settings: new direntry, changing the target inode, | |
726 | * changing the parent inode. | |
727 | */ | |
728 | ||
4cb2a01d AV |
729 | dbg_gen("dent '%pd' to ino %lu (nlink %d) in dir ino %lu", |
730 | dentry, inode->i_ino, | |
1e51764a | 731 | inode->i_nlink, dir->i_ino); |
5955102c AV |
732 | ubifs_assert(inode_is_locked(dir)); |
733 | ubifs_assert(inode_is_locked(inode)); | |
8b3884a8 | 734 | |
5653878c EB |
735 | err = fscrypt_prepare_link(old_dentry, dir, dentry); |
736 | if (err) | |
737 | return err; | |
f4f61d2c RW |
738 | |
739 | err = fscrypt_setup_filename(dir, &dentry->d_name, 0, &nm); | |
1e51764a AB |
740 | if (err) |
741 | return err; | |
742 | ||
f4f61d2c RW |
743 | err = dbg_check_synced_i_size(c, inode); |
744 | if (err) | |
745 | goto out_fname; | |
746 | ||
1e51764a AB |
747 | err = ubifs_budget_space(c, &req); |
748 | if (err) | |
f4f61d2c | 749 | goto out_fname; |
1e51764a AB |
750 | |
751 | lock_2_inodes(dir, inode); | |
32fe905c RW |
752 | |
753 | /* Handle O_TMPFILE corner case, it is allowed to link a O_TMPFILE. */ | |
754 | if (inode->i_nlink == 0) | |
755 | ubifs_delete_orphan(c, inode->i_ino); | |
756 | ||
1e51764a | 757 | inc_nlink(inode); |
7de9c6ee | 758 | ihold(inode); |
607a11ad | 759 | inode->i_ctime = current_time(inode); |
1e51764a AB |
760 | dir->i_size += sz_change; |
761 | dir_ui->ui_size = dir->i_size; | |
762 | dir->i_mtime = dir->i_ctime = inode->i_ctime; | |
f4f61d2c | 763 | err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0); |
1e51764a AB |
764 | if (err) |
765 | goto out_cancel; | |
766 | unlock_2_inodes(dir, inode); | |
767 | ||
768 | ubifs_release_budget(c, &req); | |
769 | d_instantiate(dentry, inode); | |
f4f61d2c | 770 | fscrypt_free_filename(&nm); |
1e51764a AB |
771 | return 0; |
772 | ||
773 | out_cancel: | |
774 | dir->i_size -= sz_change; | |
775 | dir_ui->ui_size = dir->i_size; | |
776 | drop_nlink(inode); | |
32fe905c RW |
777 | if (inode->i_nlink == 0) |
778 | ubifs_add_orphan(c, inode->i_ino); | |
1e51764a AB |
779 | unlock_2_inodes(dir, inode); |
780 | ubifs_release_budget(c, &req); | |
781 | iput(inode); | |
f4f61d2c RW |
782 | out_fname: |
783 | fscrypt_free_filename(&nm); | |
1e51764a AB |
784 | return err; |
785 | } | |
786 | ||
787 | static int ubifs_unlink(struct inode *dir, struct dentry *dentry) | |
788 | { | |
789 | struct ubifs_info *c = dir->i_sb->s_fs_info; | |
2b0143b5 | 790 | struct inode *inode = d_inode(dentry); |
1e51764a | 791 | struct ubifs_inode *dir_ui = ubifs_inode(dir); |
f4f61d2c | 792 | int err, sz_change, budgeted = 1; |
1e51764a | 793 | struct ubifs_budget_req req = { .mod_dent = 1, .dirtied_ino = 2 }; |
c43be108 | 794 | unsigned int saved_nlink = inode->i_nlink; |
f4f61d2c | 795 | struct fscrypt_name nm; |
1e51764a AB |
796 | |
797 | /* | |
798 | * Budget request settings: deletion direntry, deletion inode (+1 for | |
799 | * @dirtied_ino), changing the parent directory inode. If budgeting | |
800 | * fails, go ahead anyway because we have extra space reserved for | |
801 | * deletions. | |
802 | */ | |
803 | ||
4cb2a01d AV |
804 | dbg_gen("dent '%pd' from ino %lu (nlink %d) in dir ino %lu", |
805 | dentry, inode->i_ino, | |
1e51764a | 806 | inode->i_nlink, dir->i_ino); |
f4f61d2c RW |
807 | |
808 | if (ubifs_crypt_is_encrypted(dir)) { | |
809 | err = fscrypt_get_encryption_info(dir); | |
810 | if (err && err != -ENOKEY) | |
811 | return err; | |
812 | } | |
813 | ||
814 | err = fscrypt_setup_filename(dir, &dentry->d_name, 1, &nm); | |
815 | if (err) | |
816 | return err; | |
817 | ||
818 | sz_change = CALC_DENT_SIZE(fname_len(&nm)); | |
819 | ||
5955102c AV |
820 | ubifs_assert(inode_is_locked(dir)); |
821 | ubifs_assert(inode_is_locked(inode)); | |
d808efb4 | 822 | err = dbg_check_synced_i_size(c, inode); |
1e51764a | 823 | if (err) |
f4f61d2c | 824 | goto out_fname; |
1e51764a AB |
825 | |
826 | err = ubifs_budget_space(c, &req); | |
827 | if (err) { | |
828 | if (err != -ENOSPC) | |
f4f61d2c | 829 | goto out_fname; |
1e51764a AB |
830 | budgeted = 0; |
831 | } | |
832 | ||
833 | lock_2_inodes(dir, inode); | |
607a11ad | 834 | inode->i_ctime = current_time(dir); |
1e51764a AB |
835 | drop_nlink(inode); |
836 | dir->i_size -= sz_change; | |
837 | dir_ui->ui_size = dir->i_size; | |
838 | dir->i_mtime = dir->i_ctime = inode->i_ctime; | |
f4f61d2c | 839 | err = ubifs_jnl_update(c, dir, &nm, inode, 1, 0); |
1e51764a AB |
840 | if (err) |
841 | goto out_cancel; | |
842 | unlock_2_inodes(dir, inode); | |
843 | ||
844 | if (budgeted) | |
845 | ubifs_release_budget(c, &req); | |
846 | else { | |
847 | /* We've deleted something - clean the "no space" flags */ | |
b137545c | 848 | c->bi.nospace = c->bi.nospace_rp = 0; |
1e51764a AB |
849 | smp_wmb(); |
850 | } | |
f4f61d2c | 851 | fscrypt_free_filename(&nm); |
1e51764a AB |
852 | return 0; |
853 | ||
854 | out_cancel: | |
855 | dir->i_size += sz_change; | |
856 | dir_ui->ui_size = dir->i_size; | |
c43be108 | 857 | set_nlink(inode, saved_nlink); |
1e51764a AB |
858 | unlock_2_inodes(dir, inode); |
859 | if (budgeted) | |
860 | ubifs_release_budget(c, &req); | |
f4f61d2c RW |
861 | out_fname: |
862 | fscrypt_free_filename(&nm); | |
1e51764a AB |
863 | return err; |
864 | } | |
865 | ||
866 | /** | |
867 | * check_dir_empty - check if a directory is empty or not. | |
1e51764a AB |
868 | * @dir: VFS inode object of the directory to check |
869 | * | |
870 | * This function checks if directory @dir is empty. Returns zero if the | |
871 | * directory is empty, %-ENOTEMPTY if it is not, and other negative error codes | |
872 | * in case of of errors. | |
873 | */ | |
f6337d84 | 874 | int ubifs_check_dir_empty(struct inode *dir) |
1e51764a | 875 | { |
f6337d84 | 876 | struct ubifs_info *c = dir->i_sb->s_fs_info; |
f4f61d2c | 877 | struct fscrypt_name nm = { 0 }; |
1e51764a AB |
878 | struct ubifs_dent_node *dent; |
879 | union ubifs_key key; | |
880 | int err; | |
881 | ||
882 | lowest_dent_key(c, &key, dir->i_ino); | |
883 | dent = ubifs_tnc_next_ent(c, &key, &nm); | |
884 | if (IS_ERR(dent)) { | |
885 | err = PTR_ERR(dent); | |
886 | if (err == -ENOENT) | |
887 | err = 0; | |
888 | } else { | |
889 | kfree(dent); | |
890 | err = -ENOTEMPTY; | |
891 | } | |
892 | return err; | |
893 | } | |
894 | ||
895 | static int ubifs_rmdir(struct inode *dir, struct dentry *dentry) | |
896 | { | |
897 | struct ubifs_info *c = dir->i_sb->s_fs_info; | |
2b0143b5 | 898 | struct inode *inode = d_inode(dentry); |
f4f61d2c | 899 | int err, sz_change, budgeted = 1; |
1e51764a AB |
900 | struct ubifs_inode *dir_ui = ubifs_inode(dir); |
901 | struct ubifs_budget_req req = { .mod_dent = 1, .dirtied_ino = 2 }; | |
f4f61d2c | 902 | struct fscrypt_name nm; |
1e51764a AB |
903 | |
904 | /* | |
905 | * Budget request settings: deletion direntry, deletion inode and | |
906 | * changing the parent inode. If budgeting fails, go ahead anyway | |
907 | * because we have extra space reserved for deletions. | |
908 | */ | |
909 | ||
4cb2a01d AV |
910 | dbg_gen("directory '%pd', ino %lu in dir ino %lu", dentry, |
911 | inode->i_ino, dir->i_ino); | |
5955102c AV |
912 | ubifs_assert(inode_is_locked(dir)); |
913 | ubifs_assert(inode_is_locked(inode)); | |
f6337d84 | 914 | err = ubifs_check_dir_empty(d_inode(dentry)); |
1e51764a AB |
915 | if (err) |
916 | return err; | |
917 | ||
f4f61d2c RW |
918 | if (ubifs_crypt_is_encrypted(dir)) { |
919 | err = fscrypt_get_encryption_info(dir); | |
920 | if (err && err != -ENOKEY) | |
921 | return err; | |
922 | } | |
923 | ||
924 | err = fscrypt_setup_filename(dir, &dentry->d_name, 1, &nm); | |
925 | if (err) | |
926 | return err; | |
927 | ||
928 | sz_change = CALC_DENT_SIZE(fname_len(&nm)); | |
929 | ||
1e51764a AB |
930 | err = ubifs_budget_space(c, &req); |
931 | if (err) { | |
932 | if (err != -ENOSPC) | |
f4f61d2c | 933 | goto out_fname; |
1e51764a AB |
934 | budgeted = 0; |
935 | } | |
936 | ||
937 | lock_2_inodes(dir, inode); | |
607a11ad | 938 | inode->i_ctime = current_time(dir); |
1e51764a AB |
939 | clear_nlink(inode); |
940 | drop_nlink(dir); | |
941 | dir->i_size -= sz_change; | |
942 | dir_ui->ui_size = dir->i_size; | |
943 | dir->i_mtime = dir->i_ctime = inode->i_ctime; | |
f4f61d2c | 944 | err = ubifs_jnl_update(c, dir, &nm, inode, 1, 0); |
1e51764a AB |
945 | if (err) |
946 | goto out_cancel; | |
947 | unlock_2_inodes(dir, inode); | |
948 | ||
949 | if (budgeted) | |
950 | ubifs_release_budget(c, &req); | |
951 | else { | |
952 | /* We've deleted something - clean the "no space" flags */ | |
b137545c | 953 | c->bi.nospace = c->bi.nospace_rp = 0; |
1e51764a AB |
954 | smp_wmb(); |
955 | } | |
f4f61d2c | 956 | fscrypt_free_filename(&nm); |
1e51764a AB |
957 | return 0; |
958 | ||
959 | out_cancel: | |
960 | dir->i_size += sz_change; | |
961 | dir_ui->ui_size = dir->i_size; | |
962 | inc_nlink(dir); | |
c43be108 | 963 | set_nlink(inode, 2); |
1e51764a AB |
964 | unlock_2_inodes(dir, inode); |
965 | if (budgeted) | |
966 | ubifs_release_budget(c, &req); | |
f4f61d2c RW |
967 | out_fname: |
968 | fscrypt_free_filename(&nm); | |
1e51764a AB |
969 | return err; |
970 | } | |
971 | ||
18bb1db3 | 972 | static int ubifs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
1e51764a AB |
973 | { |
974 | struct inode *inode; | |
975 | struct ubifs_inode *dir_ui = ubifs_inode(dir); | |
976 | struct ubifs_info *c = dir->i_sb->s_fs_info; | |
f4f61d2c | 977 | int err, sz_change; |
182854b4 | 978 | struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1 }; |
f4f61d2c | 979 | struct fscrypt_name nm; |
1e51764a AB |
980 | |
981 | /* | |
982 | * Budget request settings: new inode, new direntry and changing parent | |
983 | * directory inode. | |
984 | */ | |
985 | ||
4cb2a01d AV |
986 | dbg_gen("dent '%pd', mode %#hx in dir ino %lu", |
987 | dentry, mode, dir->i_ino); | |
1e51764a AB |
988 | |
989 | err = ubifs_budget_space(c, &req); | |
990 | if (err) | |
991 | return err; | |
992 | ||
f4f61d2c RW |
993 | err = fscrypt_setup_filename(dir, &dentry->d_name, 0, &nm); |
994 | if (err) | |
995 | goto out_budg; | |
996 | ||
997 | sz_change = CALC_DENT_SIZE(fname_len(&nm)); | |
998 | ||
1e51764a AB |
999 | inode = ubifs_new_inode(c, dir, S_IFDIR | mode); |
1000 | if (IS_ERR(inode)) { | |
1001 | err = PTR_ERR(inode); | |
f4f61d2c | 1002 | goto out_fname; |
1e51764a AB |
1003 | } |
1004 | ||
d7f0b70d SN |
1005 | err = ubifs_init_security(dir, inode, &dentry->d_name); |
1006 | if (err) | |
9401a795 | 1007 | goto out_inode; |
d7f0b70d | 1008 | |
1e51764a AB |
1009 | mutex_lock(&dir_ui->ui_mutex); |
1010 | insert_inode_hash(inode); | |
1011 | inc_nlink(inode); | |
1012 | inc_nlink(dir); | |
1013 | dir->i_size += sz_change; | |
1014 | dir_ui->ui_size = dir->i_size; | |
1015 | dir->i_mtime = dir->i_ctime = inode->i_ctime; | |
f4f61d2c | 1016 | err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0); |
1e51764a | 1017 | if (err) { |
235c362b | 1018 | ubifs_err(c, "cannot create directory, error %d", err); |
1e51764a AB |
1019 | goto out_cancel; |
1020 | } | |
1021 | mutex_unlock(&dir_ui->ui_mutex); | |
1022 | ||
1023 | ubifs_release_budget(c, &req); | |
1024 | d_instantiate(dentry, inode); | |
f4f61d2c | 1025 | fscrypt_free_filename(&nm); |
1e51764a AB |
1026 | return 0; |
1027 | ||
1028 | out_cancel: | |
1029 | dir->i_size -= sz_change; | |
1030 | dir_ui->ui_size = dir->i_size; | |
1031 | drop_nlink(dir); | |
1032 | mutex_unlock(&dir_ui->ui_mutex); | |
9401a795 | 1033 | out_inode: |
1e51764a AB |
1034 | make_bad_inode(inode); |
1035 | iput(inode); | |
f4f61d2c RW |
1036 | out_fname: |
1037 | fscrypt_free_filename(&nm); | |
1e51764a AB |
1038 | out_budg: |
1039 | ubifs_release_budget(c, &req); | |
1040 | return err; | |
1041 | } | |
1042 | ||
1043 | static int ubifs_mknod(struct inode *dir, struct dentry *dentry, | |
1a67aafb | 1044 | umode_t mode, dev_t rdev) |
1e51764a AB |
1045 | { |
1046 | struct inode *inode; | |
1047 | struct ubifs_inode *ui; | |
1048 | struct ubifs_inode *dir_ui = ubifs_inode(dir); | |
1049 | struct ubifs_info *c = dir->i_sb->s_fs_info; | |
1050 | union ubifs_dev_desc *dev = NULL; | |
f4f61d2c | 1051 | int sz_change; |
1e51764a AB |
1052 | int err, devlen = 0; |
1053 | struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1, | |
dab4b4d2 | 1054 | .dirtied_ino = 1 }; |
f4f61d2c | 1055 | struct fscrypt_name nm; |
1e51764a AB |
1056 | |
1057 | /* | |
1058 | * Budget request settings: new inode, new direntry and changing parent | |
1059 | * directory inode. | |
1060 | */ | |
1061 | ||
4cb2a01d | 1062 | dbg_gen("dent '%pd' in dir ino %lu", dentry, dir->i_ino); |
1e51764a | 1063 | |
1e51764a AB |
1064 | if (S_ISBLK(mode) || S_ISCHR(mode)) { |
1065 | dev = kmalloc(sizeof(union ubifs_dev_desc), GFP_NOFS); | |
1066 | if (!dev) | |
1067 | return -ENOMEM; | |
1068 | devlen = ubifs_encode_dev(dev, rdev); | |
1069 | } | |
1070 | ||
4d35ca4f | 1071 | req.new_ino_d = ALIGN(devlen, 8); |
1e51764a AB |
1072 | err = ubifs_budget_space(c, &req); |
1073 | if (err) { | |
1074 | kfree(dev); | |
1075 | return err; | |
1076 | } | |
1077 | ||
f4f61d2c | 1078 | err = fscrypt_setup_filename(dir, &dentry->d_name, 0, &nm); |
63ed6573 RW |
1079 | if (err) { |
1080 | kfree(dev); | |
f4f61d2c | 1081 | goto out_budg; |
63ed6573 | 1082 | } |
f4f61d2c RW |
1083 | |
1084 | sz_change = CALC_DENT_SIZE(fname_len(&nm)); | |
1085 | ||
1e51764a AB |
1086 | inode = ubifs_new_inode(c, dir, mode); |
1087 | if (IS_ERR(inode)) { | |
1088 | kfree(dev); | |
1089 | err = PTR_ERR(inode); | |
f4f61d2c | 1090 | goto out_fname; |
1e51764a AB |
1091 | } |
1092 | ||
1093 | init_special_inode(inode, inode->i_mode, rdev); | |
1094 | inode->i_size = ubifs_inode(inode)->ui_size = devlen; | |
1095 | ui = ubifs_inode(inode); | |
1096 | ui->data = dev; | |
1097 | ui->data_len = devlen; | |
1098 | ||
d7f0b70d SN |
1099 | err = ubifs_init_security(dir, inode, &dentry->d_name); |
1100 | if (err) | |
9401a795 | 1101 | goto out_inode; |
d7f0b70d | 1102 | |
1e51764a AB |
1103 | mutex_lock(&dir_ui->ui_mutex); |
1104 | dir->i_size += sz_change; | |
1105 | dir_ui->ui_size = dir->i_size; | |
1106 | dir->i_mtime = dir->i_ctime = inode->i_ctime; | |
f4f61d2c | 1107 | err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0); |
1e51764a AB |
1108 | if (err) |
1109 | goto out_cancel; | |
1110 | mutex_unlock(&dir_ui->ui_mutex); | |
1111 | ||
1112 | ubifs_release_budget(c, &req); | |
1113 | insert_inode_hash(inode); | |
1114 | d_instantiate(dentry, inode); | |
f4f61d2c | 1115 | fscrypt_free_filename(&nm); |
1e51764a AB |
1116 | return 0; |
1117 | ||
1118 | out_cancel: | |
1119 | dir->i_size -= sz_change; | |
1120 | dir_ui->ui_size = dir->i_size; | |
1121 | mutex_unlock(&dir_ui->ui_mutex); | |
9401a795 | 1122 | out_inode: |
1e51764a AB |
1123 | make_bad_inode(inode); |
1124 | iput(inode); | |
f4f61d2c RW |
1125 | out_fname: |
1126 | fscrypt_free_filename(&nm); | |
1e51764a AB |
1127 | out_budg: |
1128 | ubifs_release_budget(c, &req); | |
1129 | return err; | |
1130 | } | |
1131 | ||
1132 | static int ubifs_symlink(struct inode *dir, struct dentry *dentry, | |
1133 | const char *symname) | |
1134 | { | |
1135 | struct inode *inode; | |
1136 | struct ubifs_inode *ui; | |
1137 | struct ubifs_inode *dir_ui = ubifs_inode(dir); | |
1138 | struct ubifs_info *c = dir->i_sb->s_fs_info; | |
1139 | int err, len = strlen(symname); | |
ca7f85be | 1140 | int sz_change = CALC_DENT_SIZE(len); |
0e4dda29 | 1141 | struct fscrypt_str disk_link; |
1e51764a | 1142 | struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1, |
dab4b4d2 AB |
1143 | .new_ino_d = ALIGN(len, 8), |
1144 | .dirtied_ino = 1 }; | |
ca7f85be RW |
1145 | struct fscrypt_name nm; |
1146 | ||
0e4dda29 EB |
1147 | dbg_gen("dent '%pd', target '%s' in dir ino %lu", dentry, |
1148 | symname, dir->i_ino); | |
ca7f85be | 1149 | |
0e4dda29 EB |
1150 | err = fscrypt_prepare_symlink(dir, symname, len, UBIFS_MAX_INO_DATA, |
1151 | &disk_link); | |
1152 | if (err) | |
1153 | return err; | |
1e51764a AB |
1154 | |
1155 | /* | |
1156 | * Budget request settings: new inode, new direntry and changing parent | |
1157 | * directory inode. | |
1158 | */ | |
1e51764a AB |
1159 | err = ubifs_budget_space(c, &req); |
1160 | if (err) | |
1161 | return err; | |
1162 | ||
ca7f85be RW |
1163 | err = fscrypt_setup_filename(dir, &dentry->d_name, 0, &nm); |
1164 | if (err) | |
1165 | goto out_budg; | |
1166 | ||
1e51764a AB |
1167 | inode = ubifs_new_inode(c, dir, S_IFLNK | S_IRWXUGO); |
1168 | if (IS_ERR(inode)) { | |
1169 | err = PTR_ERR(inode); | |
ca7f85be | 1170 | goto out_fname; |
1e51764a AB |
1171 | } |
1172 | ||
1173 | ui = ubifs_inode(inode); | |
ca7f85be | 1174 | ui->data = kmalloc(disk_link.len, GFP_NOFS); |
1e51764a AB |
1175 | if (!ui->data) { |
1176 | err = -ENOMEM; | |
1177 | goto out_inode; | |
1178 | } | |
1179 | ||
0e4dda29 EB |
1180 | if (IS_ENCRYPTED(inode)) { |
1181 | disk_link.name = ui->data; /* encrypt directly into ui->data */ | |
1182 | err = fscrypt_encrypt_symlink(inode, symname, len, &disk_link); | |
6b46d444 | 1183 | if (err) |
ca7f85be | 1184 | goto out_inode; |
ca7f85be | 1185 | } else { |
0e4dda29 | 1186 | memcpy(ui->data, disk_link.name, disk_link.len); |
ca7f85be RW |
1187 | inode->i_link = ui->data; |
1188 | } | |
1189 | ||
1e51764a AB |
1190 | /* |
1191 | * The terminating zero byte is not written to the flash media and it | |
1192 | * is put just to make later in-memory string processing simpler. Thus, | |
0e4dda29 | 1193 | * data length is @disk_link.len - 1, not @disk_link.len. |
1e51764a | 1194 | */ |
ca7f85be RW |
1195 | ui->data_len = disk_link.len - 1; |
1196 | inode->i_size = ubifs_inode(inode)->ui_size = disk_link.len - 1; | |
1e51764a | 1197 | |
d7f0b70d SN |
1198 | err = ubifs_init_security(dir, inode, &dentry->d_name); |
1199 | if (err) | |
9401a795 | 1200 | goto out_inode; |
d7f0b70d | 1201 | |
1e51764a AB |
1202 | mutex_lock(&dir_ui->ui_mutex); |
1203 | dir->i_size += sz_change; | |
1204 | dir_ui->ui_size = dir->i_size; | |
1205 | dir->i_mtime = dir->i_ctime = inode->i_ctime; | |
ca7f85be | 1206 | err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0); |
1e51764a AB |
1207 | if (err) |
1208 | goto out_cancel; | |
1209 | mutex_unlock(&dir_ui->ui_mutex); | |
1210 | ||
1e51764a AB |
1211 | insert_inode_hash(inode); |
1212 | d_instantiate(dentry, inode); | |
6b46d444 EB |
1213 | err = 0; |
1214 | goto out_fname; | |
1e51764a AB |
1215 | |
1216 | out_cancel: | |
1217 | dir->i_size -= sz_change; | |
1218 | dir_ui->ui_size = dir->i_size; | |
1219 | mutex_unlock(&dir_ui->ui_mutex); | |
1220 | out_inode: | |
1221 | make_bad_inode(inode); | |
1222 | iput(inode); | |
ca7f85be RW |
1223 | out_fname: |
1224 | fscrypt_free_filename(&nm); | |
1e51764a AB |
1225 | out_budg: |
1226 | ubifs_release_budget(c, &req); | |
1227 | return err; | |
1228 | } | |
1229 | ||
1230 | /** | |
9e0a1fff | 1231 | * lock_4_inodes - a wrapper for locking three UBIFS inodes. |
1e51764a AB |
1232 | * @inode1: first inode |
1233 | * @inode2: second inode | |
1234 | * @inode3: third inode | |
9e0a1fff | 1235 | * @inode4: fouth inode |
1e51764a | 1236 | * |
82c1593c | 1237 | * This function is used for 'ubifs_rename()' and @inode1 may be the same as |
9e0a1fff | 1238 | * @inode2 whereas @inode3 and @inode4 may be %NULL. |
82c1593c AB |
1239 | * |
1240 | * We do not implement any tricks to guarantee strict lock ordering, because | |
1241 | * VFS has already done it for us on the @i_mutex. So this is just a simple | |
1242 | * wrapper function. | |
1e51764a | 1243 | */ |
9e0a1fff RW |
1244 | static void lock_4_inodes(struct inode *inode1, struct inode *inode2, |
1245 | struct inode *inode3, struct inode *inode4) | |
1e51764a | 1246 | { |
82c1593c AB |
1247 | mutex_lock_nested(&ubifs_inode(inode1)->ui_mutex, WB_MUTEX_1); |
1248 | if (inode2 != inode1) | |
1249 | mutex_lock_nested(&ubifs_inode(inode2)->ui_mutex, WB_MUTEX_2); | |
1250 | if (inode3) | |
1251 | mutex_lock_nested(&ubifs_inode(inode3)->ui_mutex, WB_MUTEX_3); | |
9e0a1fff RW |
1252 | if (inode4) |
1253 | mutex_lock_nested(&ubifs_inode(inode4)->ui_mutex, WB_MUTEX_4); | |
1e51764a AB |
1254 | } |
1255 | ||
1256 | /** | |
9e0a1fff | 1257 | * unlock_4_inodes - a wrapper for unlocking three UBIFS inodes for rename. |
1e51764a AB |
1258 | * @inode1: first inode |
1259 | * @inode2: second inode | |
1260 | * @inode3: third inode | |
9e0a1fff | 1261 | * @inode4: fouth inode |
1e51764a | 1262 | */ |
9e0a1fff RW |
1263 | static void unlock_4_inodes(struct inode *inode1, struct inode *inode2, |
1264 | struct inode *inode3, struct inode *inode4) | |
1e51764a | 1265 | { |
9e0a1fff RW |
1266 | if (inode4) |
1267 | mutex_unlock(&ubifs_inode(inode4)->ui_mutex); | |
1e51764a AB |
1268 | if (inode3) |
1269 | mutex_unlock(&ubifs_inode(inode3)->ui_mutex); | |
82c1593c AB |
1270 | if (inode1 != inode2) |
1271 | mutex_unlock(&ubifs_inode(inode2)->ui_mutex); | |
1272 | mutex_unlock(&ubifs_inode(inode1)->ui_mutex); | |
1e51764a AB |
1273 | } |
1274 | ||
390975ac RW |
1275 | static int do_rename(struct inode *old_dir, struct dentry *old_dentry, |
1276 | struct inode *new_dir, struct dentry *new_dentry, | |
1277 | unsigned int flags) | |
1e51764a AB |
1278 | { |
1279 | struct ubifs_info *c = old_dir->i_sb->s_fs_info; | |
2b0143b5 DH |
1280 | struct inode *old_inode = d_inode(old_dentry); |
1281 | struct inode *new_inode = d_inode(new_dentry); | |
9e0a1fff | 1282 | struct inode *whiteout = NULL; |
1e51764a | 1283 | struct ubifs_inode *old_inode_ui = ubifs_inode(old_inode); |
9e0a1fff | 1284 | struct ubifs_inode *whiteout_ui = NULL; |
1e51764a AB |
1285 | int err, release, sync = 0, move = (new_dir != old_dir); |
1286 | int is_dir = S_ISDIR(old_inode->i_mode); | |
f4f61d2c | 1287 | int unlink = !!new_inode, new_sz, old_sz; |
1e51764a AB |
1288 | struct ubifs_budget_req req = { .new_dent = 1, .mod_dent = 1, |
1289 | .dirtied_ino = 3 }; | |
1290 | struct ubifs_budget_req ino_req = { .dirtied_ino = 1, | |
dab4b4d2 | 1291 | .dirtied_ino_d = ALIGN(old_inode_ui->data_len, 8) }; |
1e51764a | 1292 | struct timespec time; |
782759b9 | 1293 | unsigned int uninitialized_var(saved_nlink); |
f4f61d2c | 1294 | struct fscrypt_name old_nm, new_nm; |
1e51764a AB |
1295 | |
1296 | /* | |
1297 | * Budget request settings: deletion direntry, new direntry, removing | |
1298 | * the old inode, and changing old and new parent directory inodes. | |
1299 | * | |
1300 | * However, this operation also marks the target inode as dirty and | |
1301 | * does not write it, so we allocate budget for the target inode | |
1302 | * separately. | |
1303 | */ | |
1304 | ||
9e0a1fff | 1305 | dbg_gen("dent '%pd' ino %lu in dir ino %lu to dent '%pd' in dir ino %lu flags 0x%x", |
4cb2a01d | 1306 | old_dentry, old_inode->i_ino, old_dir->i_ino, |
9e0a1fff RW |
1307 | new_dentry, new_dir->i_ino, flags); |
1308 | ||
82c1593c | 1309 | if (unlink) |
5955102c | 1310 | ubifs_assert(inode_is_locked(new_inode)); |
82c1593c | 1311 | |
1e51764a | 1312 | if (unlink && is_dir) { |
f6337d84 | 1313 | err = ubifs_check_dir_empty(new_inode); |
1e51764a AB |
1314 | if (err) |
1315 | return err; | |
1316 | } | |
1317 | ||
f4f61d2c | 1318 | err = fscrypt_setup_filename(old_dir, &old_dentry->d_name, 0, &old_nm); |
1e51764a AB |
1319 | if (err) |
1320 | return err; | |
f4f61d2c RW |
1321 | |
1322 | err = fscrypt_setup_filename(new_dir, &new_dentry->d_name, 0, &new_nm); | |
1323 | if (err) { | |
1324 | fscrypt_free_filename(&old_nm); | |
1325 | return err; | |
1326 | } | |
1327 | ||
1328 | new_sz = CALC_DENT_SIZE(fname_len(&new_nm)); | |
1329 | old_sz = CALC_DENT_SIZE(fname_len(&old_nm)); | |
1330 | ||
1331 | err = ubifs_budget_space(c, &req); | |
1332 | if (err) { | |
1333 | fscrypt_free_filename(&old_nm); | |
1334 | fscrypt_free_filename(&new_nm); | |
1335 | return err; | |
1336 | } | |
1e51764a AB |
1337 | err = ubifs_budget_space(c, &ino_req); |
1338 | if (err) { | |
f4f61d2c RW |
1339 | fscrypt_free_filename(&old_nm); |
1340 | fscrypt_free_filename(&new_nm); | |
1e51764a AB |
1341 | ubifs_release_budget(c, &req); |
1342 | return err; | |
1343 | } | |
1344 | ||
9e0a1fff RW |
1345 | if (flags & RENAME_WHITEOUT) { |
1346 | union ubifs_dev_desc *dev = NULL; | |
1347 | ||
1348 | dev = kmalloc(sizeof(union ubifs_dev_desc), GFP_NOFS); | |
1349 | if (!dev) { | |
bb50c632 HL |
1350 | err = -ENOMEM; |
1351 | goto out_release; | |
9e0a1fff RW |
1352 | } |
1353 | ||
1354 | err = do_tmpfile(old_dir, old_dentry, S_IFCHR | WHITEOUT_MODE, &whiteout); | |
1355 | if (err) { | |
9e0a1fff | 1356 | kfree(dev); |
bb50c632 | 1357 | goto out_release; |
9e0a1fff RW |
1358 | } |
1359 | ||
1360 | whiteout->i_state |= I_LINKABLE; | |
1361 | whiteout_ui = ubifs_inode(whiteout); | |
1362 | whiteout_ui->data = dev; | |
1363 | whiteout_ui->data_len = ubifs_encode_dev(dev, MKDEV(0, 0)); | |
1364 | ubifs_assert(!whiteout_ui->dirty); | |
1365 | } | |
1366 | ||
1367 | lock_4_inodes(old_dir, new_dir, new_inode, whiteout); | |
1e51764a AB |
1368 | |
1369 | /* | |
1370 | * Like most other Unix systems, set the @i_ctime for inodes on a | |
1371 | * rename. | |
1372 | */ | |
607a11ad | 1373 | time = current_time(old_dir); |
1e51764a AB |
1374 | old_inode->i_ctime = time; |
1375 | ||
1376 | /* We must adjust parent link count when renaming directories */ | |
1377 | if (is_dir) { | |
1378 | if (move) { | |
1379 | /* | |
1380 | * @old_dir loses a link because we are moving | |
1381 | * @old_inode to a different directory. | |
1382 | */ | |
1383 | drop_nlink(old_dir); | |
1384 | /* | |
1385 | * @new_dir only gains a link if we are not also | |
1386 | * overwriting an existing directory. | |
1387 | */ | |
1388 | if (!unlink) | |
1389 | inc_nlink(new_dir); | |
1390 | } else { | |
1391 | /* | |
1392 | * @old_inode is not moving to a different directory, | |
1393 | * but @old_dir still loses a link if we are | |
1394 | * overwriting an existing directory. | |
1395 | */ | |
1396 | if (unlink) | |
1397 | drop_nlink(old_dir); | |
1398 | } | |
1399 | } | |
1400 | ||
1401 | old_dir->i_size -= old_sz; | |
1402 | ubifs_inode(old_dir)->ui_size = old_dir->i_size; | |
1403 | old_dir->i_mtime = old_dir->i_ctime = time; | |
1404 | new_dir->i_mtime = new_dir->i_ctime = time; | |
1405 | ||
1406 | /* | |
1407 | * And finally, if we unlinked a direntry which happened to have the | |
1408 | * same name as the moved direntry, we have to decrement @i_nlink of | |
1409 | * the unlinked inode and change its ctime. | |
1410 | */ | |
1411 | if (unlink) { | |
1412 | /* | |
1413 | * Directories cannot have hard-links, so if this is a | |
c43be108 | 1414 | * directory, just clear @i_nlink. |
1e51764a | 1415 | */ |
c43be108 | 1416 | saved_nlink = new_inode->i_nlink; |
1e51764a | 1417 | if (is_dir) |
c43be108 AB |
1418 | clear_nlink(new_inode); |
1419 | else | |
1e51764a AB |
1420 | drop_nlink(new_inode); |
1421 | new_inode->i_ctime = time; | |
1e51764a AB |
1422 | } else { |
1423 | new_dir->i_size += new_sz; | |
1424 | ubifs_inode(new_dir)->ui_size = new_dir->i_size; | |
1425 | } | |
1426 | ||
1427 | /* | |
1428 | * Do not ask 'ubifs_jnl_rename()' to flush write-buffer if @old_inode | |
1429 | * is dirty, because this will be done later on at the end of | |
1430 | * 'ubifs_rename()'. | |
1431 | */ | |
1432 | if (IS_SYNC(old_inode)) { | |
1433 | sync = IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir); | |
1434 | if (unlink && IS_SYNC(new_inode)) | |
1435 | sync = 1; | |
1436 | } | |
9e0a1fff RW |
1437 | |
1438 | if (whiteout) { | |
1439 | struct ubifs_budget_req wht_req = { .dirtied_ino = 1, | |
1440 | .dirtied_ino_d = \ | |
1441 | ALIGN(ubifs_inode(whiteout)->data_len, 8) }; | |
1442 | ||
1443 | err = ubifs_budget_space(c, &wht_req); | |
1444 | if (err) { | |
9e0a1fff RW |
1445 | kfree(whiteout_ui->data); |
1446 | whiteout_ui->data_len = 0; | |
1447 | iput(whiteout); | |
bb50c632 | 1448 | goto out_release; |
9e0a1fff RW |
1449 | } |
1450 | ||
1451 | inc_nlink(whiteout); | |
1452 | mark_inode_dirty(whiteout); | |
1453 | whiteout->i_state &= ~I_LINKABLE; | |
1454 | iput(whiteout); | |
1455 | } | |
1456 | ||
f4f61d2c RW |
1457 | err = ubifs_jnl_rename(c, old_dir, old_inode, &old_nm, new_dir, |
1458 | new_inode, &new_nm, whiteout, sync); | |
1e51764a AB |
1459 | if (err) |
1460 | goto out_cancel; | |
1461 | ||
9e0a1fff | 1462 | unlock_4_inodes(old_dir, new_dir, new_inode, whiteout); |
1e51764a AB |
1463 | ubifs_release_budget(c, &req); |
1464 | ||
1465 | mutex_lock(&old_inode_ui->ui_mutex); | |
1466 | release = old_inode_ui->dirty; | |
1467 | mark_inode_dirty_sync(old_inode); | |
1468 | mutex_unlock(&old_inode_ui->ui_mutex); | |
1469 | ||
1470 | if (release) | |
1471 | ubifs_release_budget(c, &ino_req); | |
1472 | if (IS_SYNC(old_inode)) | |
a9185b41 | 1473 | err = old_inode->i_sb->s_op->write_inode(old_inode, NULL); |
f4f61d2c RW |
1474 | |
1475 | fscrypt_free_filename(&old_nm); | |
1476 | fscrypt_free_filename(&new_nm); | |
1e51764a AB |
1477 | return err; |
1478 | ||
1479 | out_cancel: | |
1480 | if (unlink) { | |
c43be108 | 1481 | set_nlink(new_inode, saved_nlink); |
1e51764a AB |
1482 | } else { |
1483 | new_dir->i_size -= new_sz; | |
1484 | ubifs_inode(new_dir)->ui_size = new_dir->i_size; | |
1485 | } | |
1486 | old_dir->i_size += old_sz; | |
1487 | ubifs_inode(old_dir)->ui_size = old_dir->i_size; | |
1488 | if (is_dir) { | |
1489 | if (move) { | |
1490 | inc_nlink(old_dir); | |
1491 | if (!unlink) | |
1492 | drop_nlink(new_dir); | |
1493 | } else { | |
1494 | if (unlink) | |
1495 | inc_nlink(old_dir); | |
1496 | } | |
1497 | } | |
9e0a1fff RW |
1498 | if (whiteout) { |
1499 | drop_nlink(whiteout); | |
1500 | iput(whiteout); | |
1501 | } | |
1502 | unlock_4_inodes(old_dir, new_dir, new_inode, whiteout); | |
bb50c632 | 1503 | out_release: |
1e51764a AB |
1504 | ubifs_release_budget(c, &ino_req); |
1505 | ubifs_release_budget(c, &req); | |
f4f61d2c RW |
1506 | fscrypt_free_filename(&old_nm); |
1507 | fscrypt_free_filename(&new_nm); | |
1e51764a AB |
1508 | return err; |
1509 | } | |
1510 | ||
9ec64962 RW |
1511 | static int ubifs_xrename(struct inode *old_dir, struct dentry *old_dentry, |
1512 | struct inode *new_dir, struct dentry *new_dentry) | |
1513 | { | |
1514 | struct ubifs_info *c = old_dir->i_sb->s_fs_info; | |
1515 | struct ubifs_budget_req req = { .new_dent = 1, .mod_dent = 1, | |
1516 | .dirtied_ino = 2 }; | |
1517 | int sync = IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir); | |
1518 | struct inode *fst_inode = d_inode(old_dentry); | |
1519 | struct inode *snd_inode = d_inode(new_dentry); | |
1520 | struct timespec time; | |
1521 | int err; | |
f4f61d2c | 1522 | struct fscrypt_name fst_nm, snd_nm; |
9ec64962 RW |
1523 | |
1524 | ubifs_assert(fst_inode && snd_inode); | |
1525 | ||
f4f61d2c RW |
1526 | err = fscrypt_setup_filename(old_dir, &old_dentry->d_name, 0, &fst_nm); |
1527 | if (err) | |
1528 | return err; | |
1529 | ||
1530 | err = fscrypt_setup_filename(new_dir, &new_dentry->d_name, 0, &snd_nm); | |
1531 | if (err) { | |
1532 | fscrypt_free_filename(&fst_nm); | |
1533 | return err; | |
1534 | } | |
1535 | ||
9ec64962 RW |
1536 | lock_4_inodes(old_dir, new_dir, NULL, NULL); |
1537 | ||
607a11ad | 1538 | time = current_time(old_dir); |
9ec64962 RW |
1539 | fst_inode->i_ctime = time; |
1540 | snd_inode->i_ctime = time; | |
1541 | old_dir->i_mtime = old_dir->i_ctime = time; | |
1542 | new_dir->i_mtime = new_dir->i_ctime = time; | |
1543 | ||
1544 | if (old_dir != new_dir) { | |
1545 | if (S_ISDIR(fst_inode->i_mode) && !S_ISDIR(snd_inode->i_mode)) { | |
1546 | inc_nlink(new_dir); | |
1547 | drop_nlink(old_dir); | |
1548 | } | |
1549 | else if (!S_ISDIR(fst_inode->i_mode) && S_ISDIR(snd_inode->i_mode)) { | |
1550 | drop_nlink(new_dir); | |
1551 | inc_nlink(old_dir); | |
1552 | } | |
1553 | } | |
1554 | ||
f4f61d2c RW |
1555 | err = ubifs_jnl_xrename(c, old_dir, fst_inode, &fst_nm, new_dir, |
1556 | snd_inode, &snd_nm, sync); | |
9ec64962 RW |
1557 | |
1558 | unlock_4_inodes(old_dir, new_dir, NULL, NULL); | |
1559 | ubifs_release_budget(c, &req); | |
1560 | ||
f4f61d2c RW |
1561 | fscrypt_free_filename(&fst_nm); |
1562 | fscrypt_free_filename(&snd_nm); | |
9ec64962 RW |
1563 | return err; |
1564 | } | |
1565 | ||
390975ac | 1566 | static int ubifs_rename(struct inode *old_dir, struct dentry *old_dentry, |
9ec64962 RW |
1567 | struct inode *new_dir, struct dentry *new_dentry, |
1568 | unsigned int flags) | |
1569 | { | |
0c1ad524 EB |
1570 | int err; |
1571 | ||
9ec64962 RW |
1572 | if (flags & ~(RENAME_NOREPLACE | RENAME_WHITEOUT | RENAME_EXCHANGE)) |
1573 | return -EINVAL; | |
1574 | ||
1575 | ubifs_assert(inode_is_locked(old_dir)); | |
1576 | ubifs_assert(inode_is_locked(new_dir)); | |
1577 | ||
0c1ad524 EB |
1578 | err = fscrypt_prepare_rename(old_dir, old_dentry, new_dir, new_dentry, |
1579 | flags); | |
1580 | if (err) | |
1581 | return err; | |
1582 | ||
9ec64962 RW |
1583 | if (flags & RENAME_EXCHANGE) |
1584 | return ubifs_xrename(old_dir, old_dentry, new_dir, new_dentry); | |
1585 | ||
390975ac | 1586 | return do_rename(old_dir, old_dentry, new_dir, new_dentry, flags); |
9ec64962 RW |
1587 | } |
1588 | ||
a528d35e DH |
1589 | int ubifs_getattr(const struct path *path, struct kstat *stat, |
1590 | u32 request_mask, unsigned int flags) | |
1e51764a AB |
1591 | { |
1592 | loff_t size; | |
a528d35e | 1593 | struct inode *inode = d_inode(path->dentry); |
1e51764a AB |
1594 | struct ubifs_inode *ui = ubifs_inode(inode); |
1595 | ||
1596 | mutex_lock(&ui->ui_mutex); | |
a02a6eba RW |
1597 | |
1598 | if (ui->flags & UBIFS_APPEND_FL) | |
1599 | stat->attributes |= STATX_ATTR_APPEND; | |
1600 | if (ui->flags & UBIFS_COMPR_FL) | |
1601 | stat->attributes |= STATX_ATTR_COMPRESSED; | |
1602 | if (ui->flags & UBIFS_CRYPT_FL) | |
1603 | stat->attributes |= STATX_ATTR_ENCRYPTED; | |
1604 | if (ui->flags & UBIFS_IMMUTABLE_FL) | |
1605 | stat->attributes |= STATX_ATTR_IMMUTABLE; | |
1606 | ||
1607 | stat->attributes_mask |= (STATX_ATTR_APPEND | | |
1608 | STATX_ATTR_COMPRESSED | | |
1609 | STATX_ATTR_ENCRYPTED | | |
1610 | STATX_ATTR_IMMUTABLE); | |
1611 | ||
6d42e7e9 | 1612 | generic_fillattr(inode, stat); |
1e51764a AB |
1613 | stat->blksize = UBIFS_BLOCK_SIZE; |
1614 | stat->size = ui->ui_size; | |
1615 | ||
1616 | /* | |
1617 | * Unfortunately, the 'stat()' system call was designed for block | |
1618 | * device based file systems, and it is not appropriate for UBIFS, | |
1619 | * because UBIFS does not have notion of "block". For example, it is | |
1620 | * difficult to tell how many block a directory takes - it actually | |
1621 | * takes less than 300 bytes, but we have to round it to block size, | |
1622 | * which introduces large mistake. This makes utilities like 'du' to | |
1623 | * report completely senseless numbers. This is the reason why UBIFS | |
1624 | * goes the same way as JFFS2 - it reports zero blocks for everything | |
1625 | * but regular files, which makes more sense than reporting completely | |
1626 | * wrong sizes. | |
1627 | */ | |
1628 | if (S_ISREG(inode->i_mode)) { | |
1629 | size = ui->xattr_size; | |
1630 | size += stat->size; | |
1631 | size = ALIGN(size, UBIFS_BLOCK_SIZE); | |
1632 | /* | |
1633 | * Note, user-space expects 512-byte blocks count irrespectively | |
1634 | * of what was reported in @stat->size. | |
1635 | */ | |
1636 | stat->blocks = size >> 9; | |
1637 | } else | |
1638 | stat->blocks = 0; | |
1639 | mutex_unlock(&ui->ui_mutex); | |
1640 | return 0; | |
1641 | } | |
1642 | ||
ba40e6a3 RW |
1643 | static int ubifs_dir_open(struct inode *dir, struct file *file) |
1644 | { | |
1645 | if (ubifs_crypt_is_encrypted(dir)) | |
1646 | return fscrypt_get_encryption_info(dir) ? -EACCES : 0; | |
1647 | ||
1648 | return 0; | |
1649 | } | |
1650 | ||
e8b81566 | 1651 | const struct inode_operations ubifs_dir_inode_operations = { |
1e51764a AB |
1652 | .lookup = ubifs_lookup, |
1653 | .create = ubifs_create, | |
1654 | .link = ubifs_link, | |
1655 | .symlink = ubifs_symlink, | |
1656 | .unlink = ubifs_unlink, | |
1657 | .mkdir = ubifs_mkdir, | |
1658 | .rmdir = ubifs_rmdir, | |
1659 | .mknod = ubifs_mknod, | |
390975ac | 1660 | .rename = ubifs_rename, |
1e51764a AB |
1661 | .setattr = ubifs_setattr, |
1662 | .getattr = ubifs_getattr, | |
1e51764a | 1663 | .listxattr = ubifs_listxattr, |
8c1c5f26 DY |
1664 | #ifdef CONFIG_UBIFS_ATIME_SUPPORT |
1665 | .update_time = ubifs_update_time, | |
1666 | #endif | |
474b9370 | 1667 | .tmpfile = ubifs_tmpfile, |
1e51764a AB |
1668 | }; |
1669 | ||
e8b81566 | 1670 | const struct file_operations ubifs_dir_operations = { |
01122e06 | 1671 | .llseek = generic_file_llseek, |
1e51764a AB |
1672 | .release = ubifs_dir_release, |
1673 | .read = generic_read_dir, | |
c51da20c | 1674 | .iterate_shared = ubifs_readdir, |
1e51764a AB |
1675 | .fsync = ubifs_fsync, |
1676 | .unlocked_ioctl = ubifs_ioctl, | |
ba40e6a3 | 1677 | .open = ubifs_dir_open, |
1e51764a AB |
1678 | #ifdef CONFIG_COMPAT |
1679 | .compat_ioctl = ubifs_compat_ioctl, | |
1680 | #endif | |
1681 | }; |