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2b27bdcc | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1e51764a AB |
2 | /* * This file is part of UBIFS. |
3 | * | |
4 | * Copyright (C) 2006-2008 Nokia Corporation. | |
5 | * Copyright (C) 2006, 2007 University of Szeged, Hungary | |
6 | * | |
1e51764a AB |
7 | * Authors: Artem Bityutskiy (Битюцкий Артём) |
8 | * Adrian Hunter | |
9 | * Zoltan Sogor | |
10 | */ | |
11 | ||
12 | /* | |
13 | * This file implements directory operations. | |
14 | * | |
15 | * All FS operations in this file allocate budget before writing anything to the | |
16 | * media. If they fail to allocate it, the error is returned. The only | |
17 | * exceptions are 'ubifs_unlink()' and 'ubifs_rmdir()' which keep working even | |
18 | * if they unable to allocate the budget, because deletion %-ENOSPC failure is | |
19 | * not what users are usually ready to get. UBIFS budgeting subsystem has some | |
20 | * space reserved for these purposes. | |
21 | * | |
22 | * All operations in this file write all inodes which they change straight | |
23 | * away, instead of marking them dirty. For example, 'ubifs_link()' changes | |
24 | * @i_size of the parent inode and writes the parent inode together with the | |
25 | * target inode. This was done to simplify file-system recovery which would | |
26 | * otherwise be very difficult to do. The only exception is rename which marks | |
27 | * the re-named inode dirty (because its @i_ctime is updated) but does not | |
28 | * write it, but just marks it as dirty. | |
29 | */ | |
30 | ||
31 | #include "ubifs.h" | |
32 | ||
33 | /** | |
34 | * inherit_flags - inherit flags of the parent inode. | |
35 | * @dir: parent inode | |
36 | * @mode: new inode mode flags | |
37 | * | |
38 | * This is a helper function for 'ubifs_new_inode()' which inherits flag of the | |
39 | * parent directory inode @dir. UBIFS inodes inherit the following flags: | |
40 | * o %UBIFS_COMPR_FL, which is useful to switch compression on/of on | |
41 | * sub-directory basis; | |
42 | * o %UBIFS_SYNC_FL - useful for the same reasons; | |
43 | * o %UBIFS_DIRSYNC_FL - similar, but relevant only to directories. | |
44 | * | |
45 | * This function returns the inherited flags. | |
46 | */ | |
ad44be5c | 47 | static int inherit_flags(const struct inode *dir, umode_t mode) |
1e51764a AB |
48 | { |
49 | int flags; | |
50 | const struct ubifs_inode *ui = ubifs_inode(dir); | |
51 | ||
52 | if (!S_ISDIR(dir->i_mode)) | |
53 | /* | |
54 | * The parent is not a directory, which means that an extended | |
55 | * attribute inode is being created. No flags. | |
56 | */ | |
57 | return 0; | |
58 | ||
59 | flags = ui->flags & (UBIFS_COMPR_FL | UBIFS_SYNC_FL | UBIFS_DIRSYNC_FL); | |
60 | if (!S_ISDIR(mode)) | |
61 | /* The "DIRSYNC" flag only applies to directories */ | |
62 | flags &= ~UBIFS_DIRSYNC_FL; | |
63 | return flags; | |
64 | } | |
65 | ||
66 | /** | |
67 | * ubifs_new_inode - allocate new UBIFS inode object. | |
68 | * @c: UBIFS file-system description object | |
69 | * @dir: parent directory inode | |
70 | * @mode: inode mode flags | |
71 | * | |
72 | * This function finds an unused inode number, allocates new inode and | |
73 | * initializes it. Returns new inode in case of success and an error code in | |
74 | * case of failure. | |
75 | */ | |
d475a507 | 76 | struct inode *ubifs_new_inode(struct ubifs_info *c, struct inode *dir, |
ad44be5c | 77 | umode_t mode) |
1e51764a | 78 | { |
d475a507 | 79 | int err; |
1e51764a AB |
80 | struct inode *inode; |
81 | struct ubifs_inode *ui; | |
d475a507 RW |
82 | bool encrypted = false; |
83 | ||
50d9fad7 | 84 | if (IS_ENCRYPTED(dir)) { |
d475a507 RW |
85 | err = fscrypt_get_encryption_info(dir); |
86 | if (err) { | |
87 | ubifs_err(c, "fscrypt_get_encryption_info failed: %i", err); | |
88 | return ERR_PTR(err); | |
89 | } | |
90 | ||
91 | if (!fscrypt_has_encryption_key(dir)) | |
92 | return ERR_PTR(-EPERM); | |
93 | ||
94 | encrypted = true; | |
95 | } | |
1e51764a AB |
96 | |
97 | inode = new_inode(c->vfs_sb); | |
98 | ui = ubifs_inode(inode); | |
99 | if (!inode) | |
100 | return ERR_PTR(-ENOMEM); | |
101 | ||
102 | /* | |
103 | * Set 'S_NOCMTIME' to prevent VFS form updating [mc]time of inodes and | |
104 | * marking them dirty in file write path (see 'file_update_time()'). | |
105 | * UBIFS has to fully control "clean <-> dirty" transitions of inodes | |
106 | * to make budgeting work. | |
107 | */ | |
12e776a0 | 108 | inode->i_flags |= S_NOCMTIME; |
1e51764a | 109 | |
abf5d08a | 110 | inode_init_owner(inode, dir, mode); |
1e51764a | 111 | inode->i_mtime = inode->i_atime = inode->i_ctime = |
607a11ad | 112 | current_time(inode); |
1e51764a | 113 | inode->i_mapping->nrpages = 0; |
1e51764a AB |
114 | |
115 | switch (mode & S_IFMT) { | |
116 | case S_IFREG: | |
117 | inode->i_mapping->a_ops = &ubifs_file_address_operations; | |
118 | inode->i_op = &ubifs_file_inode_operations; | |
119 | inode->i_fop = &ubifs_file_operations; | |
120 | break; | |
121 | case S_IFDIR: | |
122 | inode->i_op = &ubifs_dir_inode_operations; | |
123 | inode->i_fop = &ubifs_dir_operations; | |
124 | inode->i_size = ui->ui_size = UBIFS_INO_NODE_SZ; | |
125 | break; | |
126 | case S_IFLNK: | |
127 | inode->i_op = &ubifs_symlink_inode_operations; | |
128 | break; | |
129 | case S_IFSOCK: | |
130 | case S_IFIFO: | |
131 | case S_IFBLK: | |
132 | case S_IFCHR: | |
133 | inode->i_op = &ubifs_file_inode_operations; | |
f34e87f5 | 134 | encrypted = false; |
1e51764a AB |
135 | break; |
136 | default: | |
137 | BUG(); | |
138 | } | |
139 | ||
140 | ui->flags = inherit_flags(dir, mode); | |
141 | ubifs_set_inode_flags(inode); | |
142 | if (S_ISREG(mode)) | |
143 | ui->compr_type = c->default_compr; | |
144 | else | |
145 | ui->compr_type = UBIFS_COMPR_NONE; | |
146 | ui->synced_i_size = 0; | |
147 | ||
148 | spin_lock(&c->cnt_lock); | |
149 | /* Inode number overflow is currently not supported */ | |
150 | if (c->highest_inum >= INUM_WARN_WATERMARK) { | |
151 | if (c->highest_inum >= INUM_WATERMARK) { | |
152 | spin_unlock(&c->cnt_lock); | |
235c362b | 153 | ubifs_err(c, "out of inode numbers"); |
1e51764a AB |
154 | make_bad_inode(inode); |
155 | iput(inode); | |
156 | return ERR_PTR(-EINVAL); | |
157 | } | |
1a7e985d | 158 | ubifs_warn(c, "running out of inode numbers (current %lu, max %u)", |
e84461ad | 159 | (unsigned long)c->highest_inum, INUM_WATERMARK); |
1e51764a AB |
160 | } |
161 | ||
162 | inode->i_ino = ++c->highest_inum; | |
1e51764a AB |
163 | /* |
164 | * The creation sequence number remains with this inode for its | |
165 | * lifetime. All nodes for this inode have a greater sequence number, | |
166 | * and so it is possible to distinguish obsolete nodes belonging to a | |
167 | * previous incarnation of the same inode number - for example, for the | |
168 | * purpose of rebuilding the index. | |
169 | */ | |
170 | ui->creat_sqnum = ++c->max_sqnum; | |
171 | spin_unlock(&c->cnt_lock); | |
d475a507 RW |
172 | |
173 | if (encrypted) { | |
174 | err = fscrypt_inherit_context(dir, inode, &encrypted, true); | |
175 | if (err) { | |
176 | ubifs_err(c, "fscrypt_inherit_context failed: %i", err); | |
177 | make_bad_inode(inode); | |
178 | iput(inode); | |
179 | return ERR_PTR(err); | |
180 | } | |
181 | } | |
182 | ||
1e51764a AB |
183 | return inode; |
184 | } | |
185 | ||
bb2615d4 AB |
186 | static int dbg_check_name(const struct ubifs_info *c, |
187 | const struct ubifs_dent_node *dent, | |
f4f61d2c | 188 | const struct fscrypt_name *nm) |
1e51764a | 189 | { |
2b1844a8 | 190 | if (!dbg_is_chk_gen(c)) |
1e51764a | 191 | return 0; |
f4f61d2c | 192 | if (le16_to_cpu(dent->nlen) != fname_len(nm)) |
1e51764a | 193 | return -EINVAL; |
f4f61d2c | 194 | if (memcmp(dent->name, fname_name(nm), fname_len(nm))) |
1e51764a AB |
195 | return -EINVAL; |
196 | return 0; | |
197 | } | |
198 | ||
1e51764a | 199 | static struct dentry *ubifs_lookup(struct inode *dir, struct dentry *dentry, |
00cd8dd3 | 200 | unsigned int flags) |
1e51764a AB |
201 | { |
202 | int err; | |
203 | union ubifs_key key; | |
204 | struct inode *inode = NULL; | |
191ac107 | 205 | struct ubifs_dent_node *dent = NULL; |
1e51764a | 206 | struct ubifs_info *c = dir->i_sb->s_fs_info; |
f4f61d2c | 207 | struct fscrypt_name nm; |
1e51764a | 208 | |
4cb2a01d | 209 | dbg_gen("'%pd' in dir ino %lu", dentry, dir->i_ino); |
1e51764a | 210 | |
b01531db EB |
211 | err = fscrypt_prepare_lookup(dir, dentry, &nm); |
212 | if (err == -ENOENT) | |
213 | return d_splice_alias(NULL, dentry); | |
f4f61d2c RW |
214 | if (err) |
215 | return ERR_PTR(err); | |
216 | ||
217 | if (fname_len(&nm) > UBIFS_MAX_NLEN) { | |
191ac107 AV |
218 | inode = ERR_PTR(-ENAMETOOLONG); |
219 | goto done; | |
f4f61d2c | 220 | } |
1e51764a AB |
221 | |
222 | dent = kmalloc(UBIFS_MAX_DENT_NODE_SZ, GFP_NOFS); | |
f4f61d2c | 223 | if (!dent) { |
191ac107 AV |
224 | inode = ERR_PTR(-ENOMEM); |
225 | goto done; | |
f4f61d2c | 226 | } |
1e51764a | 227 | |
aec992aa | 228 | if (fname_name(&nm) == NULL) { |
f0d07a98 EB |
229 | if (nm.hash & ~UBIFS_S_KEY_HASH_MASK) |
230 | goto done; /* ENOENT */ | |
f4f61d2c | 231 | dent_key_init_hash(c, &key, dir->i_ino, nm.hash); |
528e3d17 | 232 | err = ubifs_tnc_lookup_dh(c, &key, dent, nm.minor_hash); |
f4f61d2c RW |
233 | } else { |
234 | dent_key_init(c, &key, dir->i_ino, &nm); | |
235 | err = ubifs_tnc_lookup_nm(c, &key, dent, &nm); | |
236 | } | |
1e51764a | 237 | |
1e51764a | 238 | if (err) { |
191ac107 | 239 | if (err == -ENOENT) |
1e51764a | 240 | dbg_gen("not found"); |
191ac107 AV |
241 | else |
242 | inode = ERR_PTR(err); | |
243 | goto done; | |
1e51764a AB |
244 | } |
245 | ||
f4f61d2c | 246 | if (dbg_check_name(c, dent, &nm)) { |
191ac107 AV |
247 | inode = ERR_PTR(-EINVAL); |
248 | goto done; | |
1e51764a AB |
249 | } |
250 | ||
251 | inode = ubifs_iget(dir->i_sb, le64_to_cpu(dent->inum)); | |
252 | if (IS_ERR(inode)) { | |
253 | /* | |
254 | * This should not happen. Probably the file-system needs | |
255 | * checking. | |
256 | */ | |
257 | err = PTR_ERR(inode); | |
235c362b | 258 | ubifs_err(c, "dead directory entry '%pd', error %d", |
4cb2a01d | 259 | dentry, err); |
1e51764a | 260 | ubifs_ro_mode(c, err); |
191ac107 | 261 | goto done; |
1e51764a AB |
262 | } |
263 | ||
50d9fad7 | 264 | if (IS_ENCRYPTED(dir) && |
413d5a9e EB |
265 | (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) && |
266 | !fscrypt_has_permitted_context(dir, inode)) { | |
267 | ubifs_warn(c, "Inconsistent encryption contexts: %lu/%lu", | |
268 | dir->i_ino, inode->i_ino); | |
191ac107 AV |
269 | iput(inode); |
270 | inode = ERR_PTR(-EPERM); | |
413d5a9e EB |
271 | } |
272 | ||
1e51764a AB |
273 | done: |
274 | kfree(dent); | |
f4f61d2c | 275 | fscrypt_free_filename(&nm); |
191ac107 | 276 | return d_splice_alias(inode, dentry); |
1e51764a AB |
277 | } |
278 | ||
4acdaf27 | 279 | static int ubifs_create(struct inode *dir, struct dentry *dentry, umode_t mode, |
ebfc3b49 | 280 | bool excl) |
1e51764a AB |
281 | { |
282 | struct inode *inode; | |
283 | struct ubifs_info *c = dir->i_sb->s_fs_info; | |
1e51764a AB |
284 | struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1, |
285 | .dirtied_ino = 1 }; | |
286 | struct ubifs_inode *dir_ui = ubifs_inode(dir); | |
f4f61d2c RW |
287 | struct fscrypt_name nm; |
288 | int err, sz_change; | |
1e51764a AB |
289 | |
290 | /* | |
291 | * Budget request settings: new inode, new direntry, changing the | |
292 | * parent directory inode. | |
293 | */ | |
294 | ||
4cb2a01d AV |
295 | dbg_gen("dent '%pd', mode %#hx in dir ino %lu", |
296 | dentry, mode, dir->i_ino); | |
1e51764a AB |
297 | |
298 | err = ubifs_budget_space(c, &req); | |
299 | if (err) | |
300 | return err; | |
301 | ||
f4f61d2c RW |
302 | err = fscrypt_setup_filename(dir, &dentry->d_name, 0, &nm); |
303 | if (err) | |
304 | goto out_budg; | |
305 | ||
306 | sz_change = CALC_DENT_SIZE(fname_len(&nm)); | |
307 | ||
1e51764a AB |
308 | inode = ubifs_new_inode(c, dir, mode); |
309 | if (IS_ERR(inode)) { | |
310 | err = PTR_ERR(inode); | |
f4f61d2c | 311 | goto out_fname; |
1e51764a AB |
312 | } |
313 | ||
d7f0b70d SN |
314 | err = ubifs_init_security(dir, inode, &dentry->d_name); |
315 | if (err) | |
9401a795 | 316 | goto out_inode; |
d7f0b70d | 317 | |
1e51764a AB |
318 | mutex_lock(&dir_ui->ui_mutex); |
319 | dir->i_size += sz_change; | |
320 | dir_ui->ui_size = dir->i_size; | |
321 | dir->i_mtime = dir->i_ctime = inode->i_ctime; | |
f4f61d2c | 322 | err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0); |
1e51764a AB |
323 | if (err) |
324 | goto out_cancel; | |
325 | mutex_unlock(&dir_ui->ui_mutex); | |
326 | ||
327 | ubifs_release_budget(c, &req); | |
f4f61d2c | 328 | fscrypt_free_filename(&nm); |
1e51764a AB |
329 | insert_inode_hash(inode); |
330 | d_instantiate(dentry, inode); | |
331 | return 0; | |
332 | ||
333 | out_cancel: | |
334 | dir->i_size -= sz_change; | |
335 | dir_ui->ui_size = dir->i_size; | |
336 | mutex_unlock(&dir_ui->ui_mutex); | |
9401a795 | 337 | out_inode: |
1e51764a AB |
338 | make_bad_inode(inode); |
339 | iput(inode); | |
f4f61d2c RW |
340 | out_fname: |
341 | fscrypt_free_filename(&nm); | |
1e51764a AB |
342 | out_budg: |
343 | ubifs_release_budget(c, &req); | |
235c362b | 344 | ubifs_err(c, "cannot create regular file, error %d", err); |
1e51764a AB |
345 | return err; |
346 | } | |
347 | ||
9e0a1fff RW |
348 | static int do_tmpfile(struct inode *dir, struct dentry *dentry, |
349 | umode_t mode, struct inode **whiteout) | |
474b9370 RW |
350 | { |
351 | struct inode *inode; | |
352 | struct ubifs_info *c = dir->i_sb->s_fs_info; | |
353 | struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1}; | |
354 | struct ubifs_budget_req ino_req = { .dirtied_ino = 1 }; | |
355 | struct ubifs_inode *ui, *dir_ui = ubifs_inode(dir); | |
356 | int err, instantiated = 0; | |
f4f61d2c | 357 | struct fscrypt_name nm; |
474b9370 RW |
358 | |
359 | /* | |
360 | * Budget request settings: new dirty inode, new direntry, | |
361 | * budget for dirtied inode will be released via writeback. | |
362 | */ | |
363 | ||
364 | dbg_gen("dent '%pd', mode %#hx in dir ino %lu", | |
365 | dentry, mode, dir->i_ino); | |
366 | ||
f4f61d2c | 367 | err = fscrypt_setup_filename(dir, &dentry->d_name, 0, &nm); |
474b9370 RW |
368 | if (err) |
369 | return err; | |
370 | ||
f4f61d2c RW |
371 | err = ubifs_budget_space(c, &req); |
372 | if (err) { | |
373 | fscrypt_free_filename(&nm); | |
374 | return err; | |
375 | } | |
376 | ||
474b9370 RW |
377 | err = ubifs_budget_space(c, &ino_req); |
378 | if (err) { | |
379 | ubifs_release_budget(c, &req); | |
f4f61d2c | 380 | fscrypt_free_filename(&nm); |
474b9370 RW |
381 | return err; |
382 | } | |
383 | ||
384 | inode = ubifs_new_inode(c, dir, mode); | |
385 | if (IS_ERR(inode)) { | |
386 | err = PTR_ERR(inode); | |
387 | goto out_budg; | |
388 | } | |
389 | ui = ubifs_inode(inode); | |
390 | ||
9e0a1fff RW |
391 | if (whiteout) { |
392 | init_special_inode(inode, inode->i_mode, WHITEOUT_DEV); | |
6eb61d58 | 393 | ubifs_assert(c, inode->i_op == &ubifs_file_inode_operations); |
9e0a1fff RW |
394 | } |
395 | ||
474b9370 RW |
396 | err = ubifs_init_security(dir, inode, &dentry->d_name); |
397 | if (err) | |
398 | goto out_inode; | |
399 | ||
400 | mutex_lock(&ui->ui_mutex); | |
401 | insert_inode_hash(inode); | |
9e0a1fff RW |
402 | |
403 | if (whiteout) { | |
404 | mark_inode_dirty(inode); | |
405 | drop_nlink(inode); | |
406 | *whiteout = inode; | |
407 | } else { | |
408 | d_tmpfile(dentry, inode); | |
409 | } | |
6eb61d58 | 410 | ubifs_assert(c, ui->dirty); |
9e0a1fff | 411 | |
474b9370 RW |
412 | instantiated = 1; |
413 | mutex_unlock(&ui->ui_mutex); | |
414 | ||
415 | mutex_lock(&dir_ui->ui_mutex); | |
f4f61d2c | 416 | err = ubifs_jnl_update(c, dir, &nm, inode, 1, 0); |
474b9370 RW |
417 | if (err) |
418 | goto out_cancel; | |
419 | mutex_unlock(&dir_ui->ui_mutex); | |
420 | ||
421 | ubifs_release_budget(c, &req); | |
422 | ||
423 | return 0; | |
424 | ||
425 | out_cancel: | |
426 | mutex_unlock(&dir_ui->ui_mutex); | |
427 | out_inode: | |
428 | make_bad_inode(inode); | |
429 | if (!instantiated) | |
430 | iput(inode); | |
431 | out_budg: | |
432 | ubifs_release_budget(c, &req); | |
433 | if (!instantiated) | |
434 | ubifs_release_budget(c, &ino_req); | |
f4f61d2c | 435 | fscrypt_free_filename(&nm); |
474b9370 RW |
436 | ubifs_err(c, "cannot create temporary file, error %d", err); |
437 | return err; | |
438 | } | |
439 | ||
9e0a1fff RW |
440 | static int ubifs_tmpfile(struct inode *dir, struct dentry *dentry, |
441 | umode_t mode) | |
442 | { | |
443 | return do_tmpfile(dir, dentry, mode, NULL); | |
444 | } | |
445 | ||
1e51764a AB |
446 | /** |
447 | * vfs_dent_type - get VFS directory entry type. | |
448 | * @type: UBIFS directory entry type | |
449 | * | |
450 | * This function converts UBIFS directory entry type into VFS directory entry | |
451 | * type. | |
452 | */ | |
453 | static unsigned int vfs_dent_type(uint8_t type) | |
454 | { | |
455 | switch (type) { | |
456 | case UBIFS_ITYPE_REG: | |
457 | return DT_REG; | |
458 | case UBIFS_ITYPE_DIR: | |
459 | return DT_DIR; | |
460 | case UBIFS_ITYPE_LNK: | |
461 | return DT_LNK; | |
462 | case UBIFS_ITYPE_BLK: | |
463 | return DT_BLK; | |
464 | case UBIFS_ITYPE_CHR: | |
465 | return DT_CHR; | |
466 | case UBIFS_ITYPE_FIFO: | |
467 | return DT_FIFO; | |
468 | case UBIFS_ITYPE_SOCK: | |
469 | return DT_SOCK; | |
470 | default: | |
471 | BUG(); | |
472 | } | |
473 | return 0; | |
474 | } | |
475 | ||
476 | /* | |
477 | * The classical Unix view for directory is that it is a linear array of | |
478 | * (name, inode number) entries. Linux/VFS assumes this model as well. | |
479 | * Particularly, 'readdir()' call wants us to return a directory entry offset | |
480 | * which later may be used to continue 'readdir()'ing the directory or to | |
481 | * 'seek()' to that specific direntry. Obviously UBIFS does not really fit this | |
482 | * model because directory entries are identified by keys, which may collide. | |
483 | * | |
484 | * UBIFS uses directory entry hash value for directory offsets, so | |
485 | * 'seekdir()'/'telldir()' may not always work because of possible key | |
486 | * collisions. But UBIFS guarantees that consecutive 'readdir()' calls work | |
487 | * properly by means of saving full directory entry name in the private field | |
488 | * of the file description object. | |
489 | * | |
490 | * This means that UBIFS cannot support NFS which requires full | |
491 | * 'seekdir()'/'telldir()' support. | |
492 | */ | |
01122e06 | 493 | static int ubifs_readdir(struct file *file, struct dir_context *ctx) |
1e51764a | 494 | { |
ba75d570 | 495 | int fstr_real_len = 0, err = 0; |
f4f61d2c RW |
496 | struct fscrypt_name nm; |
497 | struct fscrypt_str fstr = {0}; | |
1e51764a AB |
498 | union ubifs_key key; |
499 | struct ubifs_dent_node *dent; | |
496ad9aa | 500 | struct inode *dir = file_inode(file); |
1e51764a | 501 | struct ubifs_info *c = dir->i_sb->s_fs_info; |
50d9fad7 | 502 | bool encrypted = IS_ENCRYPTED(dir); |
1e51764a | 503 | |
01122e06 | 504 | dbg_gen("dir ino %lu, f_pos %#llx", dir->i_ino, ctx->pos); |
1e51764a | 505 | |
01122e06 | 506 | if (ctx->pos > UBIFS_S_KEY_HASH_MASK || ctx->pos == 2) |
1e51764a AB |
507 | /* |
508 | * The directory was seek'ed to a senseless position or there | |
509 | * are no more entries. | |
510 | */ | |
511 | return 0; | |
512 | ||
f4f61d2c RW |
513 | if (encrypted) { |
514 | err = fscrypt_get_encryption_info(dir); | |
3b1ada55 | 515 | if (err) |
f4f61d2c RW |
516 | return err; |
517 | ||
518 | err = fscrypt_fname_alloc_buffer(dir, UBIFS_MAX_NLEN, &fstr); | |
519 | if (err) | |
520 | return err; | |
521 | ||
522 | fstr_real_len = fstr.len; | |
523 | } | |
524 | ||
605c912b AB |
525 | if (file->f_version == 0) { |
526 | /* | |
527 | * The file was seek'ed, which means that @file->private_data | |
528 | * is now invalid. This may also be just the first | |
529 | * 'ubifs_readdir()' invocation, in which case | |
530 | * @file->private_data is NULL, and the below code is | |
531 | * basically a no-op. | |
532 | */ | |
533 | kfree(file->private_data); | |
534 | file->private_data = NULL; | |
535 | } | |
536 | ||
537 | /* | |
538 | * 'generic_file_llseek()' unconditionally sets @file->f_version to | |
539 | * zero, and we use this for detecting whether the file was seek'ed. | |
540 | */ | |
541 | file->f_version = 1; | |
542 | ||
1e51764a | 543 | /* File positions 0 and 1 correspond to "." and ".." */ |
01122e06 | 544 | if (ctx->pos < 2) { |
6eb61d58 | 545 | ubifs_assert(c, !file->private_data); |
f4f61d2c RW |
546 | if (!dir_emit_dots(file, ctx)) { |
547 | if (encrypted) | |
548 | fscrypt_fname_free_buffer(&fstr); | |
1e51764a | 549 | return 0; |
f4f61d2c | 550 | } |
1e51764a AB |
551 | |
552 | /* Find the first entry in TNC and save it */ | |
553 | lowest_dent_key(c, &key, dir->i_ino); | |
f4f61d2c | 554 | fname_len(&nm) = 0; |
1e51764a AB |
555 | dent = ubifs_tnc_next_ent(c, &key, &nm); |
556 | if (IS_ERR(dent)) { | |
557 | err = PTR_ERR(dent); | |
558 | goto out; | |
559 | } | |
560 | ||
01122e06 | 561 | ctx->pos = key_hash_flash(c, &dent->key); |
1e51764a AB |
562 | file->private_data = dent; |
563 | } | |
564 | ||
565 | dent = file->private_data; | |
566 | if (!dent) { | |
567 | /* | |
568 | * The directory was seek'ed to and is now readdir'ed. | |
01122e06 | 569 | * Find the entry corresponding to @ctx->pos or the closest one. |
1e51764a | 570 | */ |
01122e06 | 571 | dent_key_init_hash(c, &key, dir->i_ino, ctx->pos); |
f4f61d2c | 572 | fname_len(&nm) = 0; |
1e51764a AB |
573 | dent = ubifs_tnc_next_ent(c, &key, &nm); |
574 | if (IS_ERR(dent)) { | |
575 | err = PTR_ERR(dent); | |
576 | goto out; | |
577 | } | |
01122e06 | 578 | ctx->pos = key_hash_flash(c, &dent->key); |
1e51764a AB |
579 | file->private_data = dent; |
580 | } | |
581 | ||
582 | while (1) { | |
b20e2d99 HL |
583 | dbg_gen("ino %llu, new f_pos %#x", |
584 | (unsigned long long)le64_to_cpu(dent->inum), | |
1e51764a | 585 | key_hash_flash(c, &dent->key)); |
6eb61d58 | 586 | ubifs_assert(c, le64_to_cpu(dent->ch.sqnum) > |
0ecb9529 | 587 | ubifs_inode(dir)->creat_sqnum); |
1e51764a | 588 | |
f4f61d2c RW |
589 | fname_len(&nm) = le16_to_cpu(dent->nlen); |
590 | fname_name(&nm) = dent->name; | |
591 | ||
592 | if (encrypted) { | |
593 | fstr.len = fstr_real_len; | |
594 | ||
528e3d17 RW |
595 | err = fscrypt_fname_disk_to_usr(dir, key_hash_flash(c, |
596 | &dent->key), | |
597 | le32_to_cpu(dent->cookie), | |
598 | &nm.disk_name, &fstr); | |
ca7f85be | 599 | if (err) |
f4f61d2c RW |
600 | goto out; |
601 | } else { | |
602 | fstr.len = fname_len(&nm); | |
603 | fstr.name = fname_name(&nm); | |
604 | } | |
605 | ||
606 | if (!dir_emit(ctx, fstr.name, fstr.len, | |
1e51764a | 607 | le64_to_cpu(dent->inum), |
f4f61d2c RW |
608 | vfs_dent_type(dent->type))) { |
609 | if (encrypted) | |
610 | fscrypt_fname_free_buffer(&fstr); | |
1e51764a | 611 | return 0; |
f4f61d2c | 612 | } |
1e51764a AB |
613 | |
614 | /* Switch to the next entry */ | |
615 | key_read(c, &dent->key, &key); | |
1e51764a AB |
616 | dent = ubifs_tnc_next_ent(c, &key, &nm); |
617 | if (IS_ERR(dent)) { | |
618 | err = PTR_ERR(dent); | |
619 | goto out; | |
620 | } | |
621 | ||
622 | kfree(file->private_data); | |
01122e06 | 623 | ctx->pos = key_hash_flash(c, &dent->key); |
1e51764a AB |
624 | file->private_data = dent; |
625 | cond_resched(); | |
626 | } | |
627 | ||
628 | out: | |
aeeb14f7 RW |
629 | kfree(file->private_data); |
630 | file->private_data = NULL; | |
631 | ||
f4f61d2c RW |
632 | if (encrypted) |
633 | fscrypt_fname_free_buffer(&fstr); | |
634 | ||
c83ed4c9 | 635 | if (err != -ENOENT) |
235c362b | 636 | ubifs_err(c, "cannot find next direntry, error %d", err); |
a00052a2 RW |
637 | else |
638 | /* | |
639 | * -ENOENT is a non-fatal error in this context, the TNC uses | |
640 | * it to indicate that the cursor moved past the current directory | |
641 | * and readdir() has to stop. | |
642 | */ | |
643 | err = 0; | |
644 | ||
1e51764a | 645 | |
605c912b | 646 | /* 2 is a special value indicating that there are no more direntries */ |
01122e06 | 647 | ctx->pos = 2; |
c83ed4c9 | 648 | return err; |
1e51764a AB |
649 | } |
650 | ||
1e51764a AB |
651 | /* Free saved readdir() state when the directory is closed */ |
652 | static int ubifs_dir_release(struct inode *dir, struct file *file) | |
653 | { | |
654 | kfree(file->private_data); | |
655 | file->private_data = NULL; | |
656 | return 0; | |
657 | } | |
658 | ||
659 | /** | |
82c1593c | 660 | * lock_2_inodes - a wrapper for locking two UBIFS inodes. |
1e51764a AB |
661 | * @inode1: first inode |
662 | * @inode2: second inode | |
82c1593c AB |
663 | * |
664 | * We do not implement any tricks to guarantee strict lock ordering, because | |
665 | * VFS has already done it for us on the @i_mutex. So this is just a simple | |
666 | * wrapper function. | |
1e51764a AB |
667 | */ |
668 | static void lock_2_inodes(struct inode *inode1, struct inode *inode2) | |
669 | { | |
82c1593c AB |
670 | mutex_lock_nested(&ubifs_inode(inode1)->ui_mutex, WB_MUTEX_1); |
671 | mutex_lock_nested(&ubifs_inode(inode2)->ui_mutex, WB_MUTEX_2); | |
1e51764a AB |
672 | } |
673 | ||
674 | /** | |
82c1593c | 675 | * unlock_2_inodes - a wrapper for unlocking two UBIFS inodes. |
1e51764a AB |
676 | * @inode1: first inode |
677 | * @inode2: second inode | |
678 | */ | |
679 | static void unlock_2_inodes(struct inode *inode1, struct inode *inode2) | |
680 | { | |
1e51764a | 681 | mutex_unlock(&ubifs_inode(inode2)->ui_mutex); |
82c1593c | 682 | mutex_unlock(&ubifs_inode(inode1)->ui_mutex); |
1e51764a AB |
683 | } |
684 | ||
685 | static int ubifs_link(struct dentry *old_dentry, struct inode *dir, | |
686 | struct dentry *dentry) | |
687 | { | |
688 | struct ubifs_info *c = dir->i_sb->s_fs_info; | |
2b0143b5 | 689 | struct inode *inode = d_inode(old_dentry); |
1e51764a AB |
690 | struct ubifs_inode *ui = ubifs_inode(inode); |
691 | struct ubifs_inode *dir_ui = ubifs_inode(dir); | |
692 | int err, sz_change = CALC_DENT_SIZE(dentry->d_name.len); | |
693 | struct ubifs_budget_req req = { .new_dent = 1, .dirtied_ino = 2, | |
dab4b4d2 | 694 | .dirtied_ino_d = ALIGN(ui->data_len, 8) }; |
f4f61d2c | 695 | struct fscrypt_name nm; |
1e51764a AB |
696 | |
697 | /* | |
698 | * Budget request settings: new direntry, changing the target inode, | |
699 | * changing the parent inode. | |
700 | */ | |
701 | ||
4cb2a01d AV |
702 | dbg_gen("dent '%pd' to ino %lu (nlink %d) in dir ino %lu", |
703 | dentry, inode->i_ino, | |
1e51764a | 704 | inode->i_nlink, dir->i_ino); |
6eb61d58 RW |
705 | ubifs_assert(c, inode_is_locked(dir)); |
706 | ubifs_assert(c, inode_is_locked(inode)); | |
8b3884a8 | 707 | |
5653878c EB |
708 | err = fscrypt_prepare_link(old_dentry, dir, dentry); |
709 | if (err) | |
710 | return err; | |
f4f61d2c RW |
711 | |
712 | err = fscrypt_setup_filename(dir, &dentry->d_name, 0, &nm); | |
1e51764a AB |
713 | if (err) |
714 | return err; | |
715 | ||
f4f61d2c RW |
716 | err = dbg_check_synced_i_size(c, inode); |
717 | if (err) | |
718 | goto out_fname; | |
719 | ||
1e51764a AB |
720 | err = ubifs_budget_space(c, &req); |
721 | if (err) | |
f4f61d2c | 722 | goto out_fname; |
1e51764a AB |
723 | |
724 | lock_2_inodes(dir, inode); | |
32fe905c RW |
725 | |
726 | /* Handle O_TMPFILE corner case, it is allowed to link a O_TMPFILE. */ | |
727 | if (inode->i_nlink == 0) | |
728 | ubifs_delete_orphan(c, inode->i_ino); | |
729 | ||
1e51764a | 730 | inc_nlink(inode); |
7de9c6ee | 731 | ihold(inode); |
607a11ad | 732 | inode->i_ctime = current_time(inode); |
1e51764a AB |
733 | dir->i_size += sz_change; |
734 | dir_ui->ui_size = dir->i_size; | |
735 | dir->i_mtime = dir->i_ctime = inode->i_ctime; | |
f4f61d2c | 736 | err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0); |
1e51764a AB |
737 | if (err) |
738 | goto out_cancel; | |
739 | unlock_2_inodes(dir, inode); | |
740 | ||
741 | ubifs_release_budget(c, &req); | |
742 | d_instantiate(dentry, inode); | |
f4f61d2c | 743 | fscrypt_free_filename(&nm); |
1e51764a AB |
744 | return 0; |
745 | ||
746 | out_cancel: | |
747 | dir->i_size -= sz_change; | |
748 | dir_ui->ui_size = dir->i_size; | |
749 | drop_nlink(inode); | |
32fe905c RW |
750 | if (inode->i_nlink == 0) |
751 | ubifs_add_orphan(c, inode->i_ino); | |
1e51764a AB |
752 | unlock_2_inodes(dir, inode); |
753 | ubifs_release_budget(c, &req); | |
754 | iput(inode); | |
f4f61d2c RW |
755 | out_fname: |
756 | fscrypt_free_filename(&nm); | |
1e51764a AB |
757 | return err; |
758 | } | |
759 | ||
760 | static int ubifs_unlink(struct inode *dir, struct dentry *dentry) | |
761 | { | |
762 | struct ubifs_info *c = dir->i_sb->s_fs_info; | |
2b0143b5 | 763 | struct inode *inode = d_inode(dentry); |
1e51764a | 764 | struct ubifs_inode *dir_ui = ubifs_inode(dir); |
f4f61d2c | 765 | int err, sz_change, budgeted = 1; |
1e51764a | 766 | struct ubifs_budget_req req = { .mod_dent = 1, .dirtied_ino = 2 }; |
c43be108 | 767 | unsigned int saved_nlink = inode->i_nlink; |
f4f61d2c | 768 | struct fscrypt_name nm; |
1e51764a AB |
769 | |
770 | /* | |
771 | * Budget request settings: deletion direntry, deletion inode (+1 for | |
772 | * @dirtied_ino), changing the parent directory inode. If budgeting | |
773 | * fails, go ahead anyway because we have extra space reserved for | |
774 | * deletions. | |
775 | */ | |
776 | ||
4cb2a01d AV |
777 | dbg_gen("dent '%pd' from ino %lu (nlink %d) in dir ino %lu", |
778 | dentry, inode->i_ino, | |
1e51764a | 779 | inode->i_nlink, dir->i_ino); |
f4f61d2c | 780 | |
f4f61d2c RW |
781 | err = fscrypt_setup_filename(dir, &dentry->d_name, 1, &nm); |
782 | if (err) | |
783 | return err; | |
784 | ||
9ca2d732 RW |
785 | err = ubifs_purge_xattrs(inode); |
786 | if (err) | |
787 | return err; | |
788 | ||
f4f61d2c RW |
789 | sz_change = CALC_DENT_SIZE(fname_len(&nm)); |
790 | ||
6eb61d58 RW |
791 | ubifs_assert(c, inode_is_locked(dir)); |
792 | ubifs_assert(c, inode_is_locked(inode)); | |
d808efb4 | 793 | err = dbg_check_synced_i_size(c, inode); |
1e51764a | 794 | if (err) |
f4f61d2c | 795 | goto out_fname; |
1e51764a AB |
796 | |
797 | err = ubifs_budget_space(c, &req); | |
798 | if (err) { | |
799 | if (err != -ENOSPC) | |
f4f61d2c | 800 | goto out_fname; |
1e51764a AB |
801 | budgeted = 0; |
802 | } | |
803 | ||
804 | lock_2_inodes(dir, inode); | |
607a11ad | 805 | inode->i_ctime = current_time(dir); |
1e51764a AB |
806 | drop_nlink(inode); |
807 | dir->i_size -= sz_change; | |
808 | dir_ui->ui_size = dir->i_size; | |
809 | dir->i_mtime = dir->i_ctime = inode->i_ctime; | |
f4f61d2c | 810 | err = ubifs_jnl_update(c, dir, &nm, inode, 1, 0); |
1e51764a AB |
811 | if (err) |
812 | goto out_cancel; | |
813 | unlock_2_inodes(dir, inode); | |
814 | ||
815 | if (budgeted) | |
816 | ubifs_release_budget(c, &req); | |
817 | else { | |
818 | /* We've deleted something - clean the "no space" flags */ | |
b137545c | 819 | c->bi.nospace = c->bi.nospace_rp = 0; |
1e51764a AB |
820 | smp_wmb(); |
821 | } | |
f4f61d2c | 822 | fscrypt_free_filename(&nm); |
1e51764a AB |
823 | return 0; |
824 | ||
825 | out_cancel: | |
826 | dir->i_size += sz_change; | |
827 | dir_ui->ui_size = dir->i_size; | |
c43be108 | 828 | set_nlink(inode, saved_nlink); |
1e51764a AB |
829 | unlock_2_inodes(dir, inode); |
830 | if (budgeted) | |
831 | ubifs_release_budget(c, &req); | |
f4f61d2c RW |
832 | out_fname: |
833 | fscrypt_free_filename(&nm); | |
1e51764a AB |
834 | return err; |
835 | } | |
836 | ||
837 | /** | |
838 | * check_dir_empty - check if a directory is empty or not. | |
1e51764a AB |
839 | * @dir: VFS inode object of the directory to check |
840 | * | |
841 | * This function checks if directory @dir is empty. Returns zero if the | |
842 | * directory is empty, %-ENOTEMPTY if it is not, and other negative error codes | |
843 | * in case of of errors. | |
844 | */ | |
f6337d84 | 845 | int ubifs_check_dir_empty(struct inode *dir) |
1e51764a | 846 | { |
f6337d84 | 847 | struct ubifs_info *c = dir->i_sb->s_fs_info; |
f4f61d2c | 848 | struct fscrypt_name nm = { 0 }; |
1e51764a AB |
849 | struct ubifs_dent_node *dent; |
850 | union ubifs_key key; | |
851 | int err; | |
852 | ||
853 | lowest_dent_key(c, &key, dir->i_ino); | |
854 | dent = ubifs_tnc_next_ent(c, &key, &nm); | |
855 | if (IS_ERR(dent)) { | |
856 | err = PTR_ERR(dent); | |
857 | if (err == -ENOENT) | |
858 | err = 0; | |
859 | } else { | |
860 | kfree(dent); | |
861 | err = -ENOTEMPTY; | |
862 | } | |
863 | return err; | |
864 | } | |
865 | ||
866 | static int ubifs_rmdir(struct inode *dir, struct dentry *dentry) | |
867 | { | |
868 | struct ubifs_info *c = dir->i_sb->s_fs_info; | |
2b0143b5 | 869 | struct inode *inode = d_inode(dentry); |
f4f61d2c | 870 | int err, sz_change, budgeted = 1; |
1e51764a AB |
871 | struct ubifs_inode *dir_ui = ubifs_inode(dir); |
872 | struct ubifs_budget_req req = { .mod_dent = 1, .dirtied_ino = 2 }; | |
f4f61d2c | 873 | struct fscrypt_name nm; |
1e51764a AB |
874 | |
875 | /* | |
876 | * Budget request settings: deletion direntry, deletion inode and | |
877 | * changing the parent inode. If budgeting fails, go ahead anyway | |
878 | * because we have extra space reserved for deletions. | |
879 | */ | |
880 | ||
4cb2a01d AV |
881 | dbg_gen("directory '%pd', ino %lu in dir ino %lu", dentry, |
882 | inode->i_ino, dir->i_ino); | |
6eb61d58 RW |
883 | ubifs_assert(c, inode_is_locked(dir)); |
884 | ubifs_assert(c, inode_is_locked(inode)); | |
f6337d84 | 885 | err = ubifs_check_dir_empty(d_inode(dentry)); |
1e51764a AB |
886 | if (err) |
887 | return err; | |
888 | ||
f4f61d2c RW |
889 | err = fscrypt_setup_filename(dir, &dentry->d_name, 1, &nm); |
890 | if (err) | |
891 | return err; | |
892 | ||
9ca2d732 RW |
893 | err = ubifs_purge_xattrs(inode); |
894 | if (err) | |
895 | return err; | |
896 | ||
f4f61d2c RW |
897 | sz_change = CALC_DENT_SIZE(fname_len(&nm)); |
898 | ||
1e51764a AB |
899 | err = ubifs_budget_space(c, &req); |
900 | if (err) { | |
901 | if (err != -ENOSPC) | |
f4f61d2c | 902 | goto out_fname; |
1e51764a AB |
903 | budgeted = 0; |
904 | } | |
905 | ||
906 | lock_2_inodes(dir, inode); | |
607a11ad | 907 | inode->i_ctime = current_time(dir); |
1e51764a AB |
908 | clear_nlink(inode); |
909 | drop_nlink(dir); | |
910 | dir->i_size -= sz_change; | |
911 | dir_ui->ui_size = dir->i_size; | |
912 | dir->i_mtime = dir->i_ctime = inode->i_ctime; | |
f4f61d2c | 913 | err = ubifs_jnl_update(c, dir, &nm, inode, 1, 0); |
1e51764a AB |
914 | if (err) |
915 | goto out_cancel; | |
916 | unlock_2_inodes(dir, inode); | |
917 | ||
918 | if (budgeted) | |
919 | ubifs_release_budget(c, &req); | |
920 | else { | |
921 | /* We've deleted something - clean the "no space" flags */ | |
b137545c | 922 | c->bi.nospace = c->bi.nospace_rp = 0; |
1e51764a AB |
923 | smp_wmb(); |
924 | } | |
f4f61d2c | 925 | fscrypt_free_filename(&nm); |
1e51764a AB |
926 | return 0; |
927 | ||
928 | out_cancel: | |
929 | dir->i_size += sz_change; | |
930 | dir_ui->ui_size = dir->i_size; | |
931 | inc_nlink(dir); | |
c43be108 | 932 | set_nlink(inode, 2); |
1e51764a AB |
933 | unlock_2_inodes(dir, inode); |
934 | if (budgeted) | |
935 | ubifs_release_budget(c, &req); | |
f4f61d2c RW |
936 | out_fname: |
937 | fscrypt_free_filename(&nm); | |
1e51764a AB |
938 | return err; |
939 | } | |
940 | ||
18bb1db3 | 941 | static int ubifs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
1e51764a AB |
942 | { |
943 | struct inode *inode; | |
944 | struct ubifs_inode *dir_ui = ubifs_inode(dir); | |
945 | struct ubifs_info *c = dir->i_sb->s_fs_info; | |
f4f61d2c | 946 | int err, sz_change; |
182854b4 | 947 | struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1 }; |
f4f61d2c | 948 | struct fscrypt_name nm; |
1e51764a AB |
949 | |
950 | /* | |
951 | * Budget request settings: new inode, new direntry and changing parent | |
952 | * directory inode. | |
953 | */ | |
954 | ||
4cb2a01d AV |
955 | dbg_gen("dent '%pd', mode %#hx in dir ino %lu", |
956 | dentry, mode, dir->i_ino); | |
1e51764a AB |
957 | |
958 | err = ubifs_budget_space(c, &req); | |
959 | if (err) | |
960 | return err; | |
961 | ||
f4f61d2c RW |
962 | err = fscrypt_setup_filename(dir, &dentry->d_name, 0, &nm); |
963 | if (err) | |
964 | goto out_budg; | |
965 | ||
966 | sz_change = CALC_DENT_SIZE(fname_len(&nm)); | |
967 | ||
1e51764a AB |
968 | inode = ubifs_new_inode(c, dir, S_IFDIR | mode); |
969 | if (IS_ERR(inode)) { | |
970 | err = PTR_ERR(inode); | |
f4f61d2c | 971 | goto out_fname; |
1e51764a AB |
972 | } |
973 | ||
d7f0b70d SN |
974 | err = ubifs_init_security(dir, inode, &dentry->d_name); |
975 | if (err) | |
9401a795 | 976 | goto out_inode; |
d7f0b70d | 977 | |
1e51764a AB |
978 | mutex_lock(&dir_ui->ui_mutex); |
979 | insert_inode_hash(inode); | |
980 | inc_nlink(inode); | |
981 | inc_nlink(dir); | |
982 | dir->i_size += sz_change; | |
983 | dir_ui->ui_size = dir->i_size; | |
984 | dir->i_mtime = dir->i_ctime = inode->i_ctime; | |
f4f61d2c | 985 | err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0); |
1e51764a | 986 | if (err) { |
235c362b | 987 | ubifs_err(c, "cannot create directory, error %d", err); |
1e51764a AB |
988 | goto out_cancel; |
989 | } | |
990 | mutex_unlock(&dir_ui->ui_mutex); | |
991 | ||
992 | ubifs_release_budget(c, &req); | |
993 | d_instantiate(dentry, inode); | |
f4f61d2c | 994 | fscrypt_free_filename(&nm); |
1e51764a AB |
995 | return 0; |
996 | ||
997 | out_cancel: | |
998 | dir->i_size -= sz_change; | |
999 | dir_ui->ui_size = dir->i_size; | |
1000 | drop_nlink(dir); | |
1001 | mutex_unlock(&dir_ui->ui_mutex); | |
9401a795 | 1002 | out_inode: |
1e51764a AB |
1003 | make_bad_inode(inode); |
1004 | iput(inode); | |
f4f61d2c RW |
1005 | out_fname: |
1006 | fscrypt_free_filename(&nm); | |
1e51764a AB |
1007 | out_budg: |
1008 | ubifs_release_budget(c, &req); | |
1009 | return err; | |
1010 | } | |
1011 | ||
1012 | static int ubifs_mknod(struct inode *dir, struct dentry *dentry, | |
1a67aafb | 1013 | umode_t mode, dev_t rdev) |
1e51764a AB |
1014 | { |
1015 | struct inode *inode; | |
1016 | struct ubifs_inode *ui; | |
1017 | struct ubifs_inode *dir_ui = ubifs_inode(dir); | |
1018 | struct ubifs_info *c = dir->i_sb->s_fs_info; | |
1019 | union ubifs_dev_desc *dev = NULL; | |
f4f61d2c | 1020 | int sz_change; |
1e51764a AB |
1021 | int err, devlen = 0; |
1022 | struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1, | |
dab4b4d2 | 1023 | .dirtied_ino = 1 }; |
f4f61d2c | 1024 | struct fscrypt_name nm; |
1e51764a AB |
1025 | |
1026 | /* | |
1027 | * Budget request settings: new inode, new direntry and changing parent | |
1028 | * directory inode. | |
1029 | */ | |
1030 | ||
4cb2a01d | 1031 | dbg_gen("dent '%pd' in dir ino %lu", dentry, dir->i_ino); |
1e51764a | 1032 | |
1e51764a AB |
1033 | if (S_ISBLK(mode) || S_ISCHR(mode)) { |
1034 | dev = kmalloc(sizeof(union ubifs_dev_desc), GFP_NOFS); | |
1035 | if (!dev) | |
1036 | return -ENOMEM; | |
1037 | devlen = ubifs_encode_dev(dev, rdev); | |
1038 | } | |
1039 | ||
4d35ca4f | 1040 | req.new_ino_d = ALIGN(devlen, 8); |
1e51764a AB |
1041 | err = ubifs_budget_space(c, &req); |
1042 | if (err) { | |
1043 | kfree(dev); | |
1044 | return err; | |
1045 | } | |
1046 | ||
f4f61d2c | 1047 | err = fscrypt_setup_filename(dir, &dentry->d_name, 0, &nm); |
63ed6573 RW |
1048 | if (err) { |
1049 | kfree(dev); | |
f4f61d2c | 1050 | goto out_budg; |
63ed6573 | 1051 | } |
f4f61d2c RW |
1052 | |
1053 | sz_change = CALC_DENT_SIZE(fname_len(&nm)); | |
1054 | ||
1e51764a AB |
1055 | inode = ubifs_new_inode(c, dir, mode); |
1056 | if (IS_ERR(inode)) { | |
1057 | kfree(dev); | |
1058 | err = PTR_ERR(inode); | |
f4f61d2c | 1059 | goto out_fname; |
1e51764a AB |
1060 | } |
1061 | ||
1062 | init_special_inode(inode, inode->i_mode, rdev); | |
1063 | inode->i_size = ubifs_inode(inode)->ui_size = devlen; | |
1064 | ui = ubifs_inode(inode); | |
1065 | ui->data = dev; | |
1066 | ui->data_len = devlen; | |
1067 | ||
d7f0b70d SN |
1068 | err = ubifs_init_security(dir, inode, &dentry->d_name); |
1069 | if (err) | |
9401a795 | 1070 | goto out_inode; |
d7f0b70d | 1071 | |
1e51764a AB |
1072 | mutex_lock(&dir_ui->ui_mutex); |
1073 | dir->i_size += sz_change; | |
1074 | dir_ui->ui_size = dir->i_size; | |
1075 | dir->i_mtime = dir->i_ctime = inode->i_ctime; | |
f4f61d2c | 1076 | err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0); |
1e51764a AB |
1077 | if (err) |
1078 | goto out_cancel; | |
1079 | mutex_unlock(&dir_ui->ui_mutex); | |
1080 | ||
1081 | ubifs_release_budget(c, &req); | |
1082 | insert_inode_hash(inode); | |
1083 | d_instantiate(dentry, inode); | |
f4f61d2c | 1084 | fscrypt_free_filename(&nm); |
1e51764a AB |
1085 | return 0; |
1086 | ||
1087 | out_cancel: | |
1088 | dir->i_size -= sz_change; | |
1089 | dir_ui->ui_size = dir->i_size; | |
1090 | mutex_unlock(&dir_ui->ui_mutex); | |
9401a795 | 1091 | out_inode: |
1e51764a AB |
1092 | make_bad_inode(inode); |
1093 | iput(inode); | |
f4f61d2c RW |
1094 | out_fname: |
1095 | fscrypt_free_filename(&nm); | |
1e51764a AB |
1096 | out_budg: |
1097 | ubifs_release_budget(c, &req); | |
1098 | return err; | |
1099 | } | |
1100 | ||
1101 | static int ubifs_symlink(struct inode *dir, struct dentry *dentry, | |
1102 | const char *symname) | |
1103 | { | |
1104 | struct inode *inode; | |
1105 | struct ubifs_inode *ui; | |
1106 | struct ubifs_inode *dir_ui = ubifs_inode(dir); | |
1107 | struct ubifs_info *c = dir->i_sb->s_fs_info; | |
00ee8b60 | 1108 | int err, sz_change, len = strlen(symname); |
0e4dda29 | 1109 | struct fscrypt_str disk_link; |
1e51764a | 1110 | struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1, |
dab4b4d2 AB |
1111 | .new_ino_d = ALIGN(len, 8), |
1112 | .dirtied_ino = 1 }; | |
ca7f85be RW |
1113 | struct fscrypt_name nm; |
1114 | ||
0e4dda29 EB |
1115 | dbg_gen("dent '%pd', target '%s' in dir ino %lu", dentry, |
1116 | symname, dir->i_ino); | |
ca7f85be | 1117 | |
0e4dda29 EB |
1118 | err = fscrypt_prepare_symlink(dir, symname, len, UBIFS_MAX_INO_DATA, |
1119 | &disk_link); | |
1120 | if (err) | |
1121 | return err; | |
1e51764a AB |
1122 | |
1123 | /* | |
1124 | * Budget request settings: new inode, new direntry and changing parent | |
1125 | * directory inode. | |
1126 | */ | |
1e51764a AB |
1127 | err = ubifs_budget_space(c, &req); |
1128 | if (err) | |
1129 | return err; | |
1130 | ||
ca7f85be RW |
1131 | err = fscrypt_setup_filename(dir, &dentry->d_name, 0, &nm); |
1132 | if (err) | |
1133 | goto out_budg; | |
1134 | ||
00ee8b60 RW |
1135 | sz_change = CALC_DENT_SIZE(fname_len(&nm)); |
1136 | ||
1e51764a AB |
1137 | inode = ubifs_new_inode(c, dir, S_IFLNK | S_IRWXUGO); |
1138 | if (IS_ERR(inode)) { | |
1139 | err = PTR_ERR(inode); | |
ca7f85be | 1140 | goto out_fname; |
1e51764a AB |
1141 | } |
1142 | ||
1143 | ui = ubifs_inode(inode); | |
ca7f85be | 1144 | ui->data = kmalloc(disk_link.len, GFP_NOFS); |
1e51764a AB |
1145 | if (!ui->data) { |
1146 | err = -ENOMEM; | |
1147 | goto out_inode; | |
1148 | } | |
1149 | ||
0e4dda29 EB |
1150 | if (IS_ENCRYPTED(inode)) { |
1151 | disk_link.name = ui->data; /* encrypt directly into ui->data */ | |
1152 | err = fscrypt_encrypt_symlink(inode, symname, len, &disk_link); | |
6b46d444 | 1153 | if (err) |
ca7f85be | 1154 | goto out_inode; |
ca7f85be | 1155 | } else { |
0e4dda29 | 1156 | memcpy(ui->data, disk_link.name, disk_link.len); |
ca7f85be RW |
1157 | inode->i_link = ui->data; |
1158 | } | |
1159 | ||
1e51764a AB |
1160 | /* |
1161 | * The terminating zero byte is not written to the flash media and it | |
1162 | * is put just to make later in-memory string processing simpler. Thus, | |
0e4dda29 | 1163 | * data length is @disk_link.len - 1, not @disk_link.len. |
1e51764a | 1164 | */ |
ca7f85be RW |
1165 | ui->data_len = disk_link.len - 1; |
1166 | inode->i_size = ubifs_inode(inode)->ui_size = disk_link.len - 1; | |
1e51764a | 1167 | |
d7f0b70d SN |
1168 | err = ubifs_init_security(dir, inode, &dentry->d_name); |
1169 | if (err) | |
9401a795 | 1170 | goto out_inode; |
d7f0b70d | 1171 | |
1e51764a AB |
1172 | mutex_lock(&dir_ui->ui_mutex); |
1173 | dir->i_size += sz_change; | |
1174 | dir_ui->ui_size = dir->i_size; | |
1175 | dir->i_mtime = dir->i_ctime = inode->i_ctime; | |
ca7f85be | 1176 | err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0); |
1e51764a AB |
1177 | if (err) |
1178 | goto out_cancel; | |
1179 | mutex_unlock(&dir_ui->ui_mutex); | |
1180 | ||
1e51764a AB |
1181 | insert_inode_hash(inode); |
1182 | d_instantiate(dentry, inode); | |
6b46d444 EB |
1183 | err = 0; |
1184 | goto out_fname; | |
1e51764a AB |
1185 | |
1186 | out_cancel: | |
1187 | dir->i_size -= sz_change; | |
1188 | dir_ui->ui_size = dir->i_size; | |
1189 | mutex_unlock(&dir_ui->ui_mutex); | |
1190 | out_inode: | |
1191 | make_bad_inode(inode); | |
1192 | iput(inode); | |
ca7f85be RW |
1193 | out_fname: |
1194 | fscrypt_free_filename(&nm); | |
1e51764a AB |
1195 | out_budg: |
1196 | ubifs_release_budget(c, &req); | |
1197 | return err; | |
1198 | } | |
1199 | ||
1200 | /** | |
9e0a1fff | 1201 | * lock_4_inodes - a wrapper for locking three UBIFS inodes. |
1e51764a AB |
1202 | * @inode1: first inode |
1203 | * @inode2: second inode | |
1204 | * @inode3: third inode | |
9e0a1fff | 1205 | * @inode4: fouth inode |
1e51764a | 1206 | * |
82c1593c | 1207 | * This function is used for 'ubifs_rename()' and @inode1 may be the same as |
9e0a1fff | 1208 | * @inode2 whereas @inode3 and @inode4 may be %NULL. |
82c1593c AB |
1209 | * |
1210 | * We do not implement any tricks to guarantee strict lock ordering, because | |
1211 | * VFS has already done it for us on the @i_mutex. So this is just a simple | |
1212 | * wrapper function. | |
1e51764a | 1213 | */ |
9e0a1fff RW |
1214 | static void lock_4_inodes(struct inode *inode1, struct inode *inode2, |
1215 | struct inode *inode3, struct inode *inode4) | |
1e51764a | 1216 | { |
82c1593c AB |
1217 | mutex_lock_nested(&ubifs_inode(inode1)->ui_mutex, WB_MUTEX_1); |
1218 | if (inode2 != inode1) | |
1219 | mutex_lock_nested(&ubifs_inode(inode2)->ui_mutex, WB_MUTEX_2); | |
1220 | if (inode3) | |
1221 | mutex_lock_nested(&ubifs_inode(inode3)->ui_mutex, WB_MUTEX_3); | |
9e0a1fff RW |
1222 | if (inode4) |
1223 | mutex_lock_nested(&ubifs_inode(inode4)->ui_mutex, WB_MUTEX_4); | |
1e51764a AB |
1224 | } |
1225 | ||
1226 | /** | |
9e0a1fff | 1227 | * unlock_4_inodes - a wrapper for unlocking three UBIFS inodes for rename. |
1e51764a AB |
1228 | * @inode1: first inode |
1229 | * @inode2: second inode | |
1230 | * @inode3: third inode | |
9e0a1fff | 1231 | * @inode4: fouth inode |
1e51764a | 1232 | */ |
9e0a1fff RW |
1233 | static void unlock_4_inodes(struct inode *inode1, struct inode *inode2, |
1234 | struct inode *inode3, struct inode *inode4) | |
1e51764a | 1235 | { |
9e0a1fff RW |
1236 | if (inode4) |
1237 | mutex_unlock(&ubifs_inode(inode4)->ui_mutex); | |
1e51764a AB |
1238 | if (inode3) |
1239 | mutex_unlock(&ubifs_inode(inode3)->ui_mutex); | |
82c1593c AB |
1240 | if (inode1 != inode2) |
1241 | mutex_unlock(&ubifs_inode(inode2)->ui_mutex); | |
1242 | mutex_unlock(&ubifs_inode(inode1)->ui_mutex); | |
1e51764a AB |
1243 | } |
1244 | ||
390975ac RW |
1245 | static int do_rename(struct inode *old_dir, struct dentry *old_dentry, |
1246 | struct inode *new_dir, struct dentry *new_dentry, | |
1247 | unsigned int flags) | |
1e51764a AB |
1248 | { |
1249 | struct ubifs_info *c = old_dir->i_sb->s_fs_info; | |
2b0143b5 DH |
1250 | struct inode *old_inode = d_inode(old_dentry); |
1251 | struct inode *new_inode = d_inode(new_dentry); | |
9e0a1fff | 1252 | struct inode *whiteout = NULL; |
1e51764a | 1253 | struct ubifs_inode *old_inode_ui = ubifs_inode(old_inode); |
9e0a1fff | 1254 | struct ubifs_inode *whiteout_ui = NULL; |
1e51764a AB |
1255 | int err, release, sync = 0, move = (new_dir != old_dir); |
1256 | int is_dir = S_ISDIR(old_inode->i_mode); | |
f4f61d2c | 1257 | int unlink = !!new_inode, new_sz, old_sz; |
1e51764a AB |
1258 | struct ubifs_budget_req req = { .new_dent = 1, .mod_dent = 1, |
1259 | .dirtied_ino = 3 }; | |
1260 | struct ubifs_budget_req ino_req = { .dirtied_ino = 1, | |
dab4b4d2 | 1261 | .dirtied_ino_d = ALIGN(old_inode_ui->data_len, 8) }; |
95582b00 | 1262 | struct timespec64 time; |
782759b9 | 1263 | unsigned int uninitialized_var(saved_nlink); |
f4f61d2c | 1264 | struct fscrypt_name old_nm, new_nm; |
1e51764a AB |
1265 | |
1266 | /* | |
1267 | * Budget request settings: deletion direntry, new direntry, removing | |
1268 | * the old inode, and changing old and new parent directory inodes. | |
1269 | * | |
1270 | * However, this operation also marks the target inode as dirty and | |
1271 | * does not write it, so we allocate budget for the target inode | |
1272 | * separately. | |
1273 | */ | |
1274 | ||
9e0a1fff | 1275 | dbg_gen("dent '%pd' ino %lu in dir ino %lu to dent '%pd' in dir ino %lu flags 0x%x", |
4cb2a01d | 1276 | old_dentry, old_inode->i_ino, old_dir->i_ino, |
9e0a1fff RW |
1277 | new_dentry, new_dir->i_ino, flags); |
1278 | ||
9ca2d732 | 1279 | if (unlink) { |
6eb61d58 | 1280 | ubifs_assert(c, inode_is_locked(new_inode)); |
82c1593c | 1281 | |
9ca2d732 RW |
1282 | err = ubifs_purge_xattrs(new_inode); |
1283 | if (err) | |
1284 | return err; | |
1285 | } | |
1286 | ||
1e51764a | 1287 | if (unlink && is_dir) { |
f6337d84 | 1288 | err = ubifs_check_dir_empty(new_inode); |
1e51764a AB |
1289 | if (err) |
1290 | return err; | |
1291 | } | |
1292 | ||
f4f61d2c | 1293 | err = fscrypt_setup_filename(old_dir, &old_dentry->d_name, 0, &old_nm); |
1e51764a AB |
1294 | if (err) |
1295 | return err; | |
f4f61d2c RW |
1296 | |
1297 | err = fscrypt_setup_filename(new_dir, &new_dentry->d_name, 0, &new_nm); | |
1298 | if (err) { | |
1299 | fscrypt_free_filename(&old_nm); | |
1300 | return err; | |
1301 | } | |
1302 | ||
1303 | new_sz = CALC_DENT_SIZE(fname_len(&new_nm)); | |
1304 | old_sz = CALC_DENT_SIZE(fname_len(&old_nm)); | |
1305 | ||
1306 | err = ubifs_budget_space(c, &req); | |
1307 | if (err) { | |
1308 | fscrypt_free_filename(&old_nm); | |
1309 | fscrypt_free_filename(&new_nm); | |
1310 | return err; | |
1311 | } | |
1e51764a AB |
1312 | err = ubifs_budget_space(c, &ino_req); |
1313 | if (err) { | |
f4f61d2c RW |
1314 | fscrypt_free_filename(&old_nm); |
1315 | fscrypt_free_filename(&new_nm); | |
1e51764a AB |
1316 | ubifs_release_budget(c, &req); |
1317 | return err; | |
1318 | } | |
1319 | ||
9e0a1fff RW |
1320 | if (flags & RENAME_WHITEOUT) { |
1321 | union ubifs_dev_desc *dev = NULL; | |
1322 | ||
1323 | dev = kmalloc(sizeof(union ubifs_dev_desc), GFP_NOFS); | |
1324 | if (!dev) { | |
bb50c632 HL |
1325 | err = -ENOMEM; |
1326 | goto out_release; | |
9e0a1fff RW |
1327 | } |
1328 | ||
1329 | err = do_tmpfile(old_dir, old_dentry, S_IFCHR | WHITEOUT_MODE, &whiteout); | |
1330 | if (err) { | |
9e0a1fff | 1331 | kfree(dev); |
bb50c632 | 1332 | goto out_release; |
9e0a1fff RW |
1333 | } |
1334 | ||
1335 | whiteout->i_state |= I_LINKABLE; | |
1336 | whiteout_ui = ubifs_inode(whiteout); | |
1337 | whiteout_ui->data = dev; | |
1338 | whiteout_ui->data_len = ubifs_encode_dev(dev, MKDEV(0, 0)); | |
6eb61d58 | 1339 | ubifs_assert(c, !whiteout_ui->dirty); |
9e0a1fff RW |
1340 | } |
1341 | ||
1342 | lock_4_inodes(old_dir, new_dir, new_inode, whiteout); | |
1e51764a AB |
1343 | |
1344 | /* | |
1345 | * Like most other Unix systems, set the @i_ctime for inodes on a | |
1346 | * rename. | |
1347 | */ | |
607a11ad | 1348 | time = current_time(old_dir); |
1e51764a AB |
1349 | old_inode->i_ctime = time; |
1350 | ||
1351 | /* We must adjust parent link count when renaming directories */ | |
1352 | if (is_dir) { | |
1353 | if (move) { | |
1354 | /* | |
1355 | * @old_dir loses a link because we are moving | |
1356 | * @old_inode to a different directory. | |
1357 | */ | |
1358 | drop_nlink(old_dir); | |
1359 | /* | |
1360 | * @new_dir only gains a link if we are not also | |
1361 | * overwriting an existing directory. | |
1362 | */ | |
1363 | if (!unlink) | |
1364 | inc_nlink(new_dir); | |
1365 | } else { | |
1366 | /* | |
1367 | * @old_inode is not moving to a different directory, | |
1368 | * but @old_dir still loses a link if we are | |
1369 | * overwriting an existing directory. | |
1370 | */ | |
1371 | if (unlink) | |
1372 | drop_nlink(old_dir); | |
1373 | } | |
1374 | } | |
1375 | ||
1376 | old_dir->i_size -= old_sz; | |
1377 | ubifs_inode(old_dir)->ui_size = old_dir->i_size; | |
1378 | old_dir->i_mtime = old_dir->i_ctime = time; | |
1379 | new_dir->i_mtime = new_dir->i_ctime = time; | |
1380 | ||
1381 | /* | |
1382 | * And finally, if we unlinked a direntry which happened to have the | |
1383 | * same name as the moved direntry, we have to decrement @i_nlink of | |
1384 | * the unlinked inode and change its ctime. | |
1385 | */ | |
1386 | if (unlink) { | |
1387 | /* | |
1388 | * Directories cannot have hard-links, so if this is a | |
c43be108 | 1389 | * directory, just clear @i_nlink. |
1e51764a | 1390 | */ |
c43be108 | 1391 | saved_nlink = new_inode->i_nlink; |
1e51764a | 1392 | if (is_dir) |
c43be108 AB |
1393 | clear_nlink(new_inode); |
1394 | else | |
1e51764a AB |
1395 | drop_nlink(new_inode); |
1396 | new_inode->i_ctime = time; | |
1e51764a AB |
1397 | } else { |
1398 | new_dir->i_size += new_sz; | |
1399 | ubifs_inode(new_dir)->ui_size = new_dir->i_size; | |
1400 | } | |
1401 | ||
1402 | /* | |
1403 | * Do not ask 'ubifs_jnl_rename()' to flush write-buffer if @old_inode | |
1404 | * is dirty, because this will be done later on at the end of | |
1405 | * 'ubifs_rename()'. | |
1406 | */ | |
1407 | if (IS_SYNC(old_inode)) { | |
1408 | sync = IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir); | |
1409 | if (unlink && IS_SYNC(new_inode)) | |
1410 | sync = 1; | |
1411 | } | |
9e0a1fff RW |
1412 | |
1413 | if (whiteout) { | |
1414 | struct ubifs_budget_req wht_req = { .dirtied_ino = 1, | |
1415 | .dirtied_ino_d = \ | |
1416 | ALIGN(ubifs_inode(whiteout)->data_len, 8) }; | |
1417 | ||
1418 | err = ubifs_budget_space(c, &wht_req); | |
1419 | if (err) { | |
9e0a1fff RW |
1420 | kfree(whiteout_ui->data); |
1421 | whiteout_ui->data_len = 0; | |
1422 | iput(whiteout); | |
bb50c632 | 1423 | goto out_release; |
9e0a1fff RW |
1424 | } |
1425 | ||
1426 | inc_nlink(whiteout); | |
1427 | mark_inode_dirty(whiteout); | |
1428 | whiteout->i_state &= ~I_LINKABLE; | |
1429 | iput(whiteout); | |
1430 | } | |
1431 | ||
f4f61d2c RW |
1432 | err = ubifs_jnl_rename(c, old_dir, old_inode, &old_nm, new_dir, |
1433 | new_inode, &new_nm, whiteout, sync); | |
1e51764a AB |
1434 | if (err) |
1435 | goto out_cancel; | |
1436 | ||
9e0a1fff | 1437 | unlock_4_inodes(old_dir, new_dir, new_inode, whiteout); |
1e51764a AB |
1438 | ubifs_release_budget(c, &req); |
1439 | ||
1440 | mutex_lock(&old_inode_ui->ui_mutex); | |
1441 | release = old_inode_ui->dirty; | |
1442 | mark_inode_dirty_sync(old_inode); | |
1443 | mutex_unlock(&old_inode_ui->ui_mutex); | |
1444 | ||
1445 | if (release) | |
1446 | ubifs_release_budget(c, &ino_req); | |
1447 | if (IS_SYNC(old_inode)) | |
a9185b41 | 1448 | err = old_inode->i_sb->s_op->write_inode(old_inode, NULL); |
f4f61d2c RW |
1449 | |
1450 | fscrypt_free_filename(&old_nm); | |
1451 | fscrypt_free_filename(&new_nm); | |
1e51764a AB |
1452 | return err; |
1453 | ||
1454 | out_cancel: | |
1455 | if (unlink) { | |
c43be108 | 1456 | set_nlink(new_inode, saved_nlink); |
1e51764a AB |
1457 | } else { |
1458 | new_dir->i_size -= new_sz; | |
1459 | ubifs_inode(new_dir)->ui_size = new_dir->i_size; | |
1460 | } | |
1461 | old_dir->i_size += old_sz; | |
1462 | ubifs_inode(old_dir)->ui_size = old_dir->i_size; | |
1463 | if (is_dir) { | |
1464 | if (move) { | |
1465 | inc_nlink(old_dir); | |
1466 | if (!unlink) | |
1467 | drop_nlink(new_dir); | |
1468 | } else { | |
1469 | if (unlink) | |
1470 | inc_nlink(old_dir); | |
1471 | } | |
1472 | } | |
9e0a1fff RW |
1473 | if (whiteout) { |
1474 | drop_nlink(whiteout); | |
1475 | iput(whiteout); | |
1476 | } | |
1477 | unlock_4_inodes(old_dir, new_dir, new_inode, whiteout); | |
bb50c632 | 1478 | out_release: |
1e51764a AB |
1479 | ubifs_release_budget(c, &ino_req); |
1480 | ubifs_release_budget(c, &req); | |
f4f61d2c RW |
1481 | fscrypt_free_filename(&old_nm); |
1482 | fscrypt_free_filename(&new_nm); | |
1e51764a AB |
1483 | return err; |
1484 | } | |
1485 | ||
9ec64962 RW |
1486 | static int ubifs_xrename(struct inode *old_dir, struct dentry *old_dentry, |
1487 | struct inode *new_dir, struct dentry *new_dentry) | |
1488 | { | |
1489 | struct ubifs_info *c = old_dir->i_sb->s_fs_info; | |
1490 | struct ubifs_budget_req req = { .new_dent = 1, .mod_dent = 1, | |
1491 | .dirtied_ino = 2 }; | |
1492 | int sync = IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir); | |
1493 | struct inode *fst_inode = d_inode(old_dentry); | |
1494 | struct inode *snd_inode = d_inode(new_dentry); | |
95582b00 | 1495 | struct timespec64 time; |
9ec64962 | 1496 | int err; |
f4f61d2c | 1497 | struct fscrypt_name fst_nm, snd_nm; |
9ec64962 | 1498 | |
6eb61d58 | 1499 | ubifs_assert(c, fst_inode && snd_inode); |
9ec64962 | 1500 | |
f4f61d2c RW |
1501 | err = fscrypt_setup_filename(old_dir, &old_dentry->d_name, 0, &fst_nm); |
1502 | if (err) | |
1503 | return err; | |
1504 | ||
1505 | err = fscrypt_setup_filename(new_dir, &new_dentry->d_name, 0, &snd_nm); | |
1506 | if (err) { | |
1507 | fscrypt_free_filename(&fst_nm); | |
1508 | return err; | |
1509 | } | |
1510 | ||
9ec64962 RW |
1511 | lock_4_inodes(old_dir, new_dir, NULL, NULL); |
1512 | ||
607a11ad | 1513 | time = current_time(old_dir); |
9ec64962 RW |
1514 | fst_inode->i_ctime = time; |
1515 | snd_inode->i_ctime = time; | |
1516 | old_dir->i_mtime = old_dir->i_ctime = time; | |
1517 | new_dir->i_mtime = new_dir->i_ctime = time; | |
1518 | ||
1519 | if (old_dir != new_dir) { | |
1520 | if (S_ISDIR(fst_inode->i_mode) && !S_ISDIR(snd_inode->i_mode)) { | |
1521 | inc_nlink(new_dir); | |
1522 | drop_nlink(old_dir); | |
1523 | } | |
1524 | else if (!S_ISDIR(fst_inode->i_mode) && S_ISDIR(snd_inode->i_mode)) { | |
1525 | drop_nlink(new_dir); | |
1526 | inc_nlink(old_dir); | |
1527 | } | |
1528 | } | |
1529 | ||
f4f61d2c RW |
1530 | err = ubifs_jnl_xrename(c, old_dir, fst_inode, &fst_nm, new_dir, |
1531 | snd_inode, &snd_nm, sync); | |
9ec64962 RW |
1532 | |
1533 | unlock_4_inodes(old_dir, new_dir, NULL, NULL); | |
1534 | ubifs_release_budget(c, &req); | |
1535 | ||
f4f61d2c RW |
1536 | fscrypt_free_filename(&fst_nm); |
1537 | fscrypt_free_filename(&snd_nm); | |
9ec64962 RW |
1538 | return err; |
1539 | } | |
1540 | ||
390975ac | 1541 | static int ubifs_rename(struct inode *old_dir, struct dentry *old_dentry, |
9ec64962 RW |
1542 | struct inode *new_dir, struct dentry *new_dentry, |
1543 | unsigned int flags) | |
1544 | { | |
0c1ad524 | 1545 | int err; |
6eb61d58 | 1546 | struct ubifs_info *c = old_dir->i_sb->s_fs_info; |
0c1ad524 | 1547 | |
9ec64962 RW |
1548 | if (flags & ~(RENAME_NOREPLACE | RENAME_WHITEOUT | RENAME_EXCHANGE)) |
1549 | return -EINVAL; | |
1550 | ||
6eb61d58 RW |
1551 | ubifs_assert(c, inode_is_locked(old_dir)); |
1552 | ubifs_assert(c, inode_is_locked(new_dir)); | |
9ec64962 | 1553 | |
0c1ad524 EB |
1554 | err = fscrypt_prepare_rename(old_dir, old_dentry, new_dir, new_dentry, |
1555 | flags); | |
1556 | if (err) | |
1557 | return err; | |
1558 | ||
9ec64962 RW |
1559 | if (flags & RENAME_EXCHANGE) |
1560 | return ubifs_xrename(old_dir, old_dentry, new_dir, new_dentry); | |
1561 | ||
390975ac | 1562 | return do_rename(old_dir, old_dentry, new_dir, new_dentry, flags); |
9ec64962 RW |
1563 | } |
1564 | ||
a528d35e DH |
1565 | int ubifs_getattr(const struct path *path, struct kstat *stat, |
1566 | u32 request_mask, unsigned int flags) | |
1e51764a AB |
1567 | { |
1568 | loff_t size; | |
a528d35e | 1569 | struct inode *inode = d_inode(path->dentry); |
1e51764a AB |
1570 | struct ubifs_inode *ui = ubifs_inode(inode); |
1571 | ||
1572 | mutex_lock(&ui->ui_mutex); | |
a02a6eba RW |
1573 | |
1574 | if (ui->flags & UBIFS_APPEND_FL) | |
1575 | stat->attributes |= STATX_ATTR_APPEND; | |
1576 | if (ui->flags & UBIFS_COMPR_FL) | |
1577 | stat->attributes |= STATX_ATTR_COMPRESSED; | |
1578 | if (ui->flags & UBIFS_CRYPT_FL) | |
1579 | stat->attributes |= STATX_ATTR_ENCRYPTED; | |
1580 | if (ui->flags & UBIFS_IMMUTABLE_FL) | |
1581 | stat->attributes |= STATX_ATTR_IMMUTABLE; | |
1582 | ||
1583 | stat->attributes_mask |= (STATX_ATTR_APPEND | | |
1584 | STATX_ATTR_COMPRESSED | | |
1585 | STATX_ATTR_ENCRYPTED | | |
1586 | STATX_ATTR_IMMUTABLE); | |
1587 | ||
6d42e7e9 | 1588 | generic_fillattr(inode, stat); |
1e51764a AB |
1589 | stat->blksize = UBIFS_BLOCK_SIZE; |
1590 | stat->size = ui->ui_size; | |
1591 | ||
1592 | /* | |
1593 | * Unfortunately, the 'stat()' system call was designed for block | |
1594 | * device based file systems, and it is not appropriate for UBIFS, | |
1595 | * because UBIFS does not have notion of "block". For example, it is | |
1596 | * difficult to tell how many block a directory takes - it actually | |
1597 | * takes less than 300 bytes, but we have to round it to block size, | |
1598 | * which introduces large mistake. This makes utilities like 'du' to | |
1599 | * report completely senseless numbers. This is the reason why UBIFS | |
1600 | * goes the same way as JFFS2 - it reports zero blocks for everything | |
1601 | * but regular files, which makes more sense than reporting completely | |
1602 | * wrong sizes. | |
1603 | */ | |
1604 | if (S_ISREG(inode->i_mode)) { | |
1605 | size = ui->xattr_size; | |
1606 | size += stat->size; | |
1607 | size = ALIGN(size, UBIFS_BLOCK_SIZE); | |
1608 | /* | |
1609 | * Note, user-space expects 512-byte blocks count irrespectively | |
1610 | * of what was reported in @stat->size. | |
1611 | */ | |
1612 | stat->blocks = size >> 9; | |
1613 | } else | |
1614 | stat->blocks = 0; | |
1615 | mutex_unlock(&ui->ui_mutex); | |
1616 | return 0; | |
1617 | } | |
1618 | ||
ba40e6a3 RW |
1619 | static int ubifs_dir_open(struct inode *dir, struct file *file) |
1620 | { | |
50d9fad7 | 1621 | if (IS_ENCRYPTED(dir)) |
ba40e6a3 RW |
1622 | return fscrypt_get_encryption_info(dir) ? -EACCES : 0; |
1623 | ||
1624 | return 0; | |
1625 | } | |
1626 | ||
e8b81566 | 1627 | const struct inode_operations ubifs_dir_inode_operations = { |
1e51764a AB |
1628 | .lookup = ubifs_lookup, |
1629 | .create = ubifs_create, | |
1630 | .link = ubifs_link, | |
1631 | .symlink = ubifs_symlink, | |
1632 | .unlink = ubifs_unlink, | |
1633 | .mkdir = ubifs_mkdir, | |
1634 | .rmdir = ubifs_rmdir, | |
1635 | .mknod = ubifs_mknod, | |
390975ac | 1636 | .rename = ubifs_rename, |
1e51764a AB |
1637 | .setattr = ubifs_setattr, |
1638 | .getattr = ubifs_getattr, | |
7e5471ce | 1639 | #ifdef CONFIG_UBIFS_FS_XATTR |
1e51764a | 1640 | .listxattr = ubifs_listxattr, |
7e5471ce | 1641 | #endif |
8c1c5f26 | 1642 | .update_time = ubifs_update_time, |
474b9370 | 1643 | .tmpfile = ubifs_tmpfile, |
1e51764a AB |
1644 | }; |
1645 | ||
e8b81566 | 1646 | const struct file_operations ubifs_dir_operations = { |
01122e06 | 1647 | .llseek = generic_file_llseek, |
1e51764a AB |
1648 | .release = ubifs_dir_release, |
1649 | .read = generic_read_dir, | |
c51da20c | 1650 | .iterate_shared = ubifs_readdir, |
1e51764a AB |
1651 | .fsync = ubifs_fsync, |
1652 | .unlocked_ioctl = ubifs_ioctl, | |
ba40e6a3 | 1653 | .open = ubifs_dir_open, |
1e51764a AB |
1654 | #ifdef CONFIG_COMPAT |
1655 | .compat_ioctl = ubifs_compat_ioctl, | |
1656 | #endif | |
1657 | }; |