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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 | ||
1e51764a AB |
84 | inode = new_inode(c->vfs_sb); |
85 | ui = ubifs_inode(inode); | |
86 | if (!inode) | |
87 | return ERR_PTR(-ENOMEM); | |
88 | ||
89 | /* | |
90 | * Set 'S_NOCMTIME' to prevent VFS form updating [mc]time of inodes and | |
91 | * marking them dirty in file write path (see 'file_update_time()'). | |
92 | * UBIFS has to fully control "clean <-> dirty" transitions of inodes | |
93 | * to make budgeting work. | |
94 | */ | |
12e776a0 | 95 | inode->i_flags |= S_NOCMTIME; |
1e51764a | 96 | |
abf5d08a | 97 | inode_init_owner(inode, dir, mode); |
1e51764a | 98 | inode->i_mtime = inode->i_atime = inode->i_ctime = |
607a11ad | 99 | current_time(inode); |
1e51764a | 100 | inode->i_mapping->nrpages = 0; |
1e51764a | 101 | |
4c030fa8 EB |
102 | err = fscrypt_prepare_new_inode(dir, inode, &encrypted); |
103 | if (err) { | |
104 | ubifs_err(c, "fscrypt_prepare_new_inode failed: %i", err); | |
105 | goto out_iput; | |
106 | } | |
107 | ||
1e51764a AB |
108 | switch (mode & S_IFMT) { |
109 | case S_IFREG: | |
110 | inode->i_mapping->a_ops = &ubifs_file_address_operations; | |
111 | inode->i_op = &ubifs_file_inode_operations; | |
112 | inode->i_fop = &ubifs_file_operations; | |
113 | break; | |
114 | case S_IFDIR: | |
115 | inode->i_op = &ubifs_dir_inode_operations; | |
116 | inode->i_fop = &ubifs_dir_operations; | |
117 | inode->i_size = ui->ui_size = UBIFS_INO_NODE_SZ; | |
118 | break; | |
119 | case S_IFLNK: | |
120 | inode->i_op = &ubifs_symlink_inode_operations; | |
121 | break; | |
122 | case S_IFSOCK: | |
123 | case S_IFIFO: | |
124 | case S_IFBLK: | |
125 | case S_IFCHR: | |
126 | inode->i_op = &ubifs_file_inode_operations; | |
127 | break; | |
128 | default: | |
129 | BUG(); | |
130 | } | |
131 | ||
132 | ui->flags = inherit_flags(dir, mode); | |
133 | ubifs_set_inode_flags(inode); | |
134 | if (S_ISREG(mode)) | |
135 | ui->compr_type = c->default_compr; | |
136 | else | |
137 | ui->compr_type = UBIFS_COMPR_NONE; | |
138 | ui->synced_i_size = 0; | |
139 | ||
140 | spin_lock(&c->cnt_lock); | |
141 | /* Inode number overflow is currently not supported */ | |
142 | if (c->highest_inum >= INUM_WARN_WATERMARK) { | |
143 | if (c->highest_inum >= INUM_WATERMARK) { | |
144 | spin_unlock(&c->cnt_lock); | |
235c362b | 145 | ubifs_err(c, "out of inode numbers"); |
4c030fa8 EB |
146 | err = -EINVAL; |
147 | goto out_iput; | |
1e51764a | 148 | } |
1a7e985d | 149 | ubifs_warn(c, "running out of inode numbers (current %lu, max %u)", |
e84461ad | 150 | (unsigned long)c->highest_inum, INUM_WATERMARK); |
1e51764a AB |
151 | } |
152 | ||
153 | inode->i_ino = ++c->highest_inum; | |
1e51764a AB |
154 | /* |
155 | * The creation sequence number remains with this inode for its | |
156 | * lifetime. All nodes for this inode have a greater sequence number, | |
157 | * and so it is possible to distinguish obsolete nodes belonging to a | |
158 | * previous incarnation of the same inode number - for example, for the | |
159 | * purpose of rebuilding the index. | |
160 | */ | |
161 | ui->creat_sqnum = ++c->max_sqnum; | |
162 | spin_unlock(&c->cnt_lock); | |
d475a507 RW |
163 | |
164 | if (encrypted) { | |
4c030fa8 | 165 | err = fscrypt_set_context(inode, NULL); |
d475a507 | 166 | if (err) { |
4c030fa8 EB |
167 | ubifs_err(c, "fscrypt_set_context failed: %i", err); |
168 | goto out_iput; | |
d475a507 RW |
169 | } |
170 | } | |
171 | ||
1e51764a | 172 | return inode; |
4c030fa8 EB |
173 | |
174 | out_iput: | |
175 | make_bad_inode(inode); | |
176 | iput(inode); | |
177 | return ERR_PTR(err); | |
1e51764a AB |
178 | } |
179 | ||
bb2615d4 AB |
180 | static int dbg_check_name(const struct ubifs_info *c, |
181 | const struct ubifs_dent_node *dent, | |
f4f61d2c | 182 | const struct fscrypt_name *nm) |
1e51764a | 183 | { |
2b1844a8 | 184 | if (!dbg_is_chk_gen(c)) |
1e51764a | 185 | return 0; |
f4f61d2c | 186 | if (le16_to_cpu(dent->nlen) != fname_len(nm)) |
1e51764a | 187 | return -EINVAL; |
f4f61d2c | 188 | if (memcmp(dent->name, fname_name(nm), fname_len(nm))) |
1e51764a AB |
189 | return -EINVAL; |
190 | return 0; | |
191 | } | |
192 | ||
1e51764a | 193 | static struct dentry *ubifs_lookup(struct inode *dir, struct dentry *dentry, |
00cd8dd3 | 194 | unsigned int flags) |
1e51764a AB |
195 | { |
196 | int err; | |
197 | union ubifs_key key; | |
198 | struct inode *inode = NULL; | |
191ac107 | 199 | struct ubifs_dent_node *dent = NULL; |
1e51764a | 200 | struct ubifs_info *c = dir->i_sb->s_fs_info; |
f4f61d2c | 201 | struct fscrypt_name nm; |
1e51764a | 202 | |
4cb2a01d | 203 | dbg_gen("'%pd' in dir ino %lu", dentry, dir->i_ino); |
1e51764a | 204 | |
b01531db | 205 | err = fscrypt_prepare_lookup(dir, dentry, &nm); |
bb9cd910 | 206 | generic_set_encrypted_ci_d_ops(dentry); |
b01531db EB |
207 | if (err == -ENOENT) |
208 | return d_splice_alias(NULL, dentry); | |
f4f61d2c RW |
209 | if (err) |
210 | return ERR_PTR(err); | |
211 | ||
212 | if (fname_len(&nm) > UBIFS_MAX_NLEN) { | |
191ac107 AV |
213 | inode = ERR_PTR(-ENAMETOOLONG); |
214 | goto done; | |
f4f61d2c | 215 | } |
1e51764a AB |
216 | |
217 | dent = kmalloc(UBIFS_MAX_DENT_NODE_SZ, GFP_NOFS); | |
f4f61d2c | 218 | if (!dent) { |
191ac107 AV |
219 | inode = ERR_PTR(-ENOMEM); |
220 | goto done; | |
f4f61d2c | 221 | } |
1e51764a | 222 | |
aec992aa | 223 | if (fname_name(&nm) == NULL) { |
f0d07a98 EB |
224 | if (nm.hash & ~UBIFS_S_KEY_HASH_MASK) |
225 | goto done; /* ENOENT */ | |
f4f61d2c | 226 | dent_key_init_hash(c, &key, dir->i_ino, nm.hash); |
528e3d17 | 227 | err = ubifs_tnc_lookup_dh(c, &key, dent, nm.minor_hash); |
f4f61d2c RW |
228 | } else { |
229 | dent_key_init(c, &key, dir->i_ino, &nm); | |
230 | err = ubifs_tnc_lookup_nm(c, &key, dent, &nm); | |
231 | } | |
1e51764a | 232 | |
1e51764a | 233 | if (err) { |
191ac107 | 234 | if (err == -ENOENT) |
1e51764a | 235 | dbg_gen("not found"); |
191ac107 AV |
236 | else |
237 | inode = ERR_PTR(err); | |
238 | goto done; | |
1e51764a AB |
239 | } |
240 | ||
f4f61d2c | 241 | if (dbg_check_name(c, dent, &nm)) { |
191ac107 AV |
242 | inode = ERR_PTR(-EINVAL); |
243 | goto done; | |
1e51764a AB |
244 | } |
245 | ||
246 | inode = ubifs_iget(dir->i_sb, le64_to_cpu(dent->inum)); | |
247 | if (IS_ERR(inode)) { | |
248 | /* | |
249 | * This should not happen. Probably the file-system needs | |
250 | * checking. | |
251 | */ | |
252 | err = PTR_ERR(inode); | |
235c362b | 253 | ubifs_err(c, "dead directory entry '%pd', error %d", |
4cb2a01d | 254 | dentry, err); |
1e51764a | 255 | ubifs_ro_mode(c, err); |
191ac107 | 256 | goto done; |
1e51764a AB |
257 | } |
258 | ||
50d9fad7 | 259 | if (IS_ENCRYPTED(dir) && |
413d5a9e EB |
260 | (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) && |
261 | !fscrypt_has_permitted_context(dir, inode)) { | |
262 | ubifs_warn(c, "Inconsistent encryption contexts: %lu/%lu", | |
263 | dir->i_ino, inode->i_ino); | |
191ac107 AV |
264 | iput(inode); |
265 | inode = ERR_PTR(-EPERM); | |
413d5a9e EB |
266 | } |
267 | ||
1e51764a AB |
268 | done: |
269 | kfree(dent); | |
f4f61d2c | 270 | fscrypt_free_filename(&nm); |
191ac107 | 271 | return d_splice_alias(inode, dentry); |
1e51764a AB |
272 | } |
273 | ||
76786a0f EB |
274 | static int ubifs_prepare_create(struct inode *dir, struct dentry *dentry, |
275 | struct fscrypt_name *nm) | |
276 | { | |
277 | if (fscrypt_is_nokey_name(dentry)) | |
278 | return -ENOKEY; | |
279 | ||
280 | return fscrypt_setup_filename(dir, &dentry->d_name, 0, nm); | |
281 | } | |
282 | ||
4acdaf27 | 283 | static int ubifs_create(struct inode *dir, struct dentry *dentry, umode_t mode, |
ebfc3b49 | 284 | bool excl) |
1e51764a AB |
285 | { |
286 | struct inode *inode; | |
287 | struct ubifs_info *c = dir->i_sb->s_fs_info; | |
1e51764a AB |
288 | struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1, |
289 | .dirtied_ino = 1 }; | |
290 | struct ubifs_inode *dir_ui = ubifs_inode(dir); | |
f4f61d2c RW |
291 | struct fscrypt_name nm; |
292 | int err, sz_change; | |
1e51764a AB |
293 | |
294 | /* | |
295 | * Budget request settings: new inode, new direntry, changing the | |
296 | * parent directory inode. | |
297 | */ | |
298 | ||
4cb2a01d AV |
299 | dbg_gen("dent '%pd', mode %#hx in dir ino %lu", |
300 | dentry, mode, dir->i_ino); | |
1e51764a AB |
301 | |
302 | err = ubifs_budget_space(c, &req); | |
303 | if (err) | |
304 | return err; | |
305 | ||
76786a0f | 306 | err = ubifs_prepare_create(dir, dentry, &nm); |
f4f61d2c RW |
307 | if (err) |
308 | goto out_budg; | |
309 | ||
310 | sz_change = CALC_DENT_SIZE(fname_len(&nm)); | |
311 | ||
1e51764a AB |
312 | inode = ubifs_new_inode(c, dir, mode); |
313 | if (IS_ERR(inode)) { | |
314 | err = PTR_ERR(inode); | |
f4f61d2c | 315 | goto out_fname; |
1e51764a AB |
316 | } |
317 | ||
d7f0b70d SN |
318 | err = ubifs_init_security(dir, inode, &dentry->d_name); |
319 | if (err) | |
9401a795 | 320 | goto out_inode; |
d7f0b70d | 321 | |
1e51764a AB |
322 | mutex_lock(&dir_ui->ui_mutex); |
323 | dir->i_size += sz_change; | |
324 | dir_ui->ui_size = dir->i_size; | |
325 | dir->i_mtime = dir->i_ctime = inode->i_ctime; | |
f4f61d2c | 326 | err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0); |
1e51764a AB |
327 | if (err) |
328 | goto out_cancel; | |
329 | mutex_unlock(&dir_ui->ui_mutex); | |
330 | ||
331 | ubifs_release_budget(c, &req); | |
f4f61d2c | 332 | fscrypt_free_filename(&nm); |
1e51764a AB |
333 | insert_inode_hash(inode); |
334 | d_instantiate(dentry, inode); | |
335 | return 0; | |
336 | ||
337 | out_cancel: | |
338 | dir->i_size -= sz_change; | |
339 | dir_ui->ui_size = dir->i_size; | |
340 | mutex_unlock(&dir_ui->ui_mutex); | |
9401a795 | 341 | out_inode: |
1e51764a AB |
342 | make_bad_inode(inode); |
343 | iput(inode); | |
f4f61d2c RW |
344 | out_fname: |
345 | fscrypt_free_filename(&nm); | |
1e51764a AB |
346 | out_budg: |
347 | ubifs_release_budget(c, &req); | |
235c362b | 348 | ubifs_err(c, "cannot create regular file, error %d", err); |
1e51764a AB |
349 | return err; |
350 | } | |
351 | ||
9e0a1fff RW |
352 | static int do_tmpfile(struct inode *dir, struct dentry *dentry, |
353 | umode_t mode, struct inode **whiteout) | |
474b9370 RW |
354 | { |
355 | struct inode *inode; | |
356 | struct ubifs_info *c = dir->i_sb->s_fs_info; | |
357 | struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1}; | |
358 | struct ubifs_budget_req ino_req = { .dirtied_ino = 1 }; | |
359 | struct ubifs_inode *ui, *dir_ui = ubifs_inode(dir); | |
360 | int err, instantiated = 0; | |
f4f61d2c | 361 | struct fscrypt_name nm; |
474b9370 RW |
362 | |
363 | /* | |
364 | * Budget request settings: new dirty inode, new direntry, | |
365 | * budget for dirtied inode will be released via writeback. | |
366 | */ | |
367 | ||
368 | dbg_gen("dent '%pd', mode %#hx in dir ino %lu", | |
369 | dentry, mode, dir->i_ino); | |
370 | ||
f4f61d2c | 371 | err = fscrypt_setup_filename(dir, &dentry->d_name, 0, &nm); |
474b9370 RW |
372 | if (err) |
373 | return err; | |
374 | ||
f4f61d2c RW |
375 | err = ubifs_budget_space(c, &req); |
376 | if (err) { | |
377 | fscrypt_free_filename(&nm); | |
378 | return err; | |
379 | } | |
380 | ||
474b9370 RW |
381 | err = ubifs_budget_space(c, &ino_req); |
382 | if (err) { | |
383 | ubifs_release_budget(c, &req); | |
f4f61d2c | 384 | fscrypt_free_filename(&nm); |
474b9370 RW |
385 | return err; |
386 | } | |
387 | ||
388 | inode = ubifs_new_inode(c, dir, mode); | |
389 | if (IS_ERR(inode)) { | |
390 | err = PTR_ERR(inode); | |
391 | goto out_budg; | |
392 | } | |
393 | ui = ubifs_inode(inode); | |
394 | ||
9e0a1fff RW |
395 | if (whiteout) { |
396 | init_special_inode(inode, inode->i_mode, WHITEOUT_DEV); | |
6eb61d58 | 397 | ubifs_assert(c, inode->i_op == &ubifs_file_inode_operations); |
9e0a1fff RW |
398 | } |
399 | ||
474b9370 RW |
400 | err = ubifs_init_security(dir, inode, &dentry->d_name); |
401 | if (err) | |
402 | goto out_inode; | |
403 | ||
404 | mutex_lock(&ui->ui_mutex); | |
405 | insert_inode_hash(inode); | |
9e0a1fff RW |
406 | |
407 | if (whiteout) { | |
408 | mark_inode_dirty(inode); | |
409 | drop_nlink(inode); | |
410 | *whiteout = inode; | |
411 | } else { | |
412 | d_tmpfile(dentry, inode); | |
413 | } | |
6eb61d58 | 414 | ubifs_assert(c, ui->dirty); |
9e0a1fff | 415 | |
474b9370 RW |
416 | instantiated = 1; |
417 | mutex_unlock(&ui->ui_mutex); | |
418 | ||
419 | mutex_lock(&dir_ui->ui_mutex); | |
f4f61d2c | 420 | err = ubifs_jnl_update(c, dir, &nm, inode, 1, 0); |
474b9370 RW |
421 | if (err) |
422 | goto out_cancel; | |
423 | mutex_unlock(&dir_ui->ui_mutex); | |
424 | ||
425 | ubifs_release_budget(c, &req); | |
426 | ||
427 | return 0; | |
428 | ||
429 | out_cancel: | |
430 | mutex_unlock(&dir_ui->ui_mutex); | |
431 | out_inode: | |
432 | make_bad_inode(inode); | |
433 | if (!instantiated) | |
434 | iput(inode); | |
435 | out_budg: | |
436 | ubifs_release_budget(c, &req); | |
437 | if (!instantiated) | |
438 | ubifs_release_budget(c, &ino_req); | |
f4f61d2c | 439 | fscrypt_free_filename(&nm); |
474b9370 RW |
440 | ubifs_err(c, "cannot create temporary file, error %d", err); |
441 | return err; | |
442 | } | |
443 | ||
9e0a1fff RW |
444 | static int ubifs_tmpfile(struct inode *dir, struct dentry *dentry, |
445 | umode_t mode) | |
446 | { | |
447 | return do_tmpfile(dir, dentry, mode, NULL); | |
448 | } | |
449 | ||
1e51764a AB |
450 | /** |
451 | * vfs_dent_type - get VFS directory entry type. | |
452 | * @type: UBIFS directory entry type | |
453 | * | |
454 | * This function converts UBIFS directory entry type into VFS directory entry | |
455 | * type. | |
456 | */ | |
457 | static unsigned int vfs_dent_type(uint8_t type) | |
458 | { | |
459 | switch (type) { | |
460 | case UBIFS_ITYPE_REG: | |
461 | return DT_REG; | |
462 | case UBIFS_ITYPE_DIR: | |
463 | return DT_DIR; | |
464 | case UBIFS_ITYPE_LNK: | |
465 | return DT_LNK; | |
466 | case UBIFS_ITYPE_BLK: | |
467 | return DT_BLK; | |
468 | case UBIFS_ITYPE_CHR: | |
469 | return DT_CHR; | |
470 | case UBIFS_ITYPE_FIFO: | |
471 | return DT_FIFO; | |
472 | case UBIFS_ITYPE_SOCK: | |
473 | return DT_SOCK; | |
474 | default: | |
475 | BUG(); | |
476 | } | |
477 | return 0; | |
478 | } | |
479 | ||
480 | /* | |
481 | * The classical Unix view for directory is that it is a linear array of | |
482 | * (name, inode number) entries. Linux/VFS assumes this model as well. | |
483 | * Particularly, 'readdir()' call wants us to return a directory entry offset | |
484 | * which later may be used to continue 'readdir()'ing the directory or to | |
485 | * 'seek()' to that specific direntry. Obviously UBIFS does not really fit this | |
486 | * model because directory entries are identified by keys, which may collide. | |
487 | * | |
488 | * UBIFS uses directory entry hash value for directory offsets, so | |
489 | * 'seekdir()'/'telldir()' may not always work because of possible key | |
490 | * collisions. But UBIFS guarantees that consecutive 'readdir()' calls work | |
491 | * properly by means of saving full directory entry name in the private field | |
492 | * of the file description object. | |
493 | * | |
494 | * This means that UBIFS cannot support NFS which requires full | |
495 | * 'seekdir()'/'telldir()' support. | |
496 | */ | |
01122e06 | 497 | static int ubifs_readdir(struct file *file, struct dir_context *ctx) |
1e51764a | 498 | { |
ba75d570 | 499 | int fstr_real_len = 0, err = 0; |
f4f61d2c RW |
500 | struct fscrypt_name nm; |
501 | struct fscrypt_str fstr = {0}; | |
1e51764a AB |
502 | union ubifs_key key; |
503 | struct ubifs_dent_node *dent; | |
496ad9aa | 504 | struct inode *dir = file_inode(file); |
1e51764a | 505 | struct ubifs_info *c = dir->i_sb->s_fs_info; |
50d9fad7 | 506 | bool encrypted = IS_ENCRYPTED(dir); |
1e51764a | 507 | |
01122e06 | 508 | dbg_gen("dir ino %lu, f_pos %#llx", dir->i_ino, ctx->pos); |
1e51764a | 509 | |
01122e06 | 510 | if (ctx->pos > UBIFS_S_KEY_HASH_MASK || ctx->pos == 2) |
1e51764a AB |
511 | /* |
512 | * The directory was seek'ed to a senseless position or there | |
513 | * are no more entries. | |
514 | */ | |
515 | return 0; | |
516 | ||
f4f61d2c | 517 | if (encrypted) { |
ec0caa97 | 518 | err = fscrypt_prepare_readdir(dir); |
3b1ada55 | 519 | if (err) |
f4f61d2c RW |
520 | return err; |
521 | ||
8b10fe68 | 522 | err = fscrypt_fname_alloc_buffer(UBIFS_MAX_NLEN, &fstr); |
f4f61d2c RW |
523 | if (err) |
524 | return err; | |
525 | ||
526 | fstr_real_len = fstr.len; | |
527 | } | |
528 | ||
605c912b AB |
529 | if (file->f_version == 0) { |
530 | /* | |
531 | * The file was seek'ed, which means that @file->private_data | |
532 | * is now invalid. This may also be just the first | |
533 | * 'ubifs_readdir()' invocation, in which case | |
534 | * @file->private_data is NULL, and the below code is | |
535 | * basically a no-op. | |
536 | */ | |
537 | kfree(file->private_data); | |
538 | file->private_data = NULL; | |
539 | } | |
540 | ||
541 | /* | |
542 | * 'generic_file_llseek()' unconditionally sets @file->f_version to | |
543 | * zero, and we use this for detecting whether the file was seek'ed. | |
544 | */ | |
545 | file->f_version = 1; | |
546 | ||
1e51764a | 547 | /* File positions 0 and 1 correspond to "." and ".." */ |
01122e06 | 548 | if (ctx->pos < 2) { |
6eb61d58 | 549 | ubifs_assert(c, !file->private_data); |
f4f61d2c RW |
550 | if (!dir_emit_dots(file, ctx)) { |
551 | if (encrypted) | |
552 | fscrypt_fname_free_buffer(&fstr); | |
1e51764a | 553 | return 0; |
f4f61d2c | 554 | } |
1e51764a AB |
555 | |
556 | /* Find the first entry in TNC and save it */ | |
557 | lowest_dent_key(c, &key, dir->i_ino); | |
f4f61d2c | 558 | fname_len(&nm) = 0; |
1e51764a AB |
559 | dent = ubifs_tnc_next_ent(c, &key, &nm); |
560 | if (IS_ERR(dent)) { | |
561 | err = PTR_ERR(dent); | |
562 | goto out; | |
563 | } | |
564 | ||
01122e06 | 565 | ctx->pos = key_hash_flash(c, &dent->key); |
1e51764a AB |
566 | file->private_data = dent; |
567 | } | |
568 | ||
569 | dent = file->private_data; | |
570 | if (!dent) { | |
571 | /* | |
572 | * The directory was seek'ed to and is now readdir'ed. | |
01122e06 | 573 | * Find the entry corresponding to @ctx->pos or the closest one. |
1e51764a | 574 | */ |
01122e06 | 575 | dent_key_init_hash(c, &key, dir->i_ino, ctx->pos); |
f4f61d2c | 576 | fname_len(&nm) = 0; |
1e51764a AB |
577 | dent = ubifs_tnc_next_ent(c, &key, &nm); |
578 | if (IS_ERR(dent)) { | |
579 | err = PTR_ERR(dent); | |
580 | goto out; | |
581 | } | |
01122e06 | 582 | ctx->pos = key_hash_flash(c, &dent->key); |
1e51764a AB |
583 | file->private_data = dent; |
584 | } | |
585 | ||
586 | while (1) { | |
b20e2d99 HL |
587 | dbg_gen("ino %llu, new f_pos %#x", |
588 | (unsigned long long)le64_to_cpu(dent->inum), | |
1e51764a | 589 | key_hash_flash(c, &dent->key)); |
6eb61d58 | 590 | ubifs_assert(c, le64_to_cpu(dent->ch.sqnum) > |
0ecb9529 | 591 | ubifs_inode(dir)->creat_sqnum); |
1e51764a | 592 | |
f4f61d2c RW |
593 | fname_len(&nm) = le16_to_cpu(dent->nlen); |
594 | fname_name(&nm) = dent->name; | |
595 | ||
596 | if (encrypted) { | |
597 | fstr.len = fstr_real_len; | |
598 | ||
528e3d17 RW |
599 | err = fscrypt_fname_disk_to_usr(dir, key_hash_flash(c, |
600 | &dent->key), | |
601 | le32_to_cpu(dent->cookie), | |
602 | &nm.disk_name, &fstr); | |
ca7f85be | 603 | if (err) |
f4f61d2c RW |
604 | goto out; |
605 | } else { | |
606 | fstr.len = fname_len(&nm); | |
607 | fstr.name = fname_name(&nm); | |
608 | } | |
609 | ||
610 | if (!dir_emit(ctx, fstr.name, fstr.len, | |
1e51764a | 611 | le64_to_cpu(dent->inum), |
f4f61d2c RW |
612 | vfs_dent_type(dent->type))) { |
613 | if (encrypted) | |
614 | fscrypt_fname_free_buffer(&fstr); | |
1e51764a | 615 | return 0; |
f4f61d2c | 616 | } |
1e51764a AB |
617 | |
618 | /* Switch to the next entry */ | |
619 | key_read(c, &dent->key, &key); | |
1e51764a AB |
620 | dent = ubifs_tnc_next_ent(c, &key, &nm); |
621 | if (IS_ERR(dent)) { | |
622 | err = PTR_ERR(dent); | |
623 | goto out; | |
624 | } | |
625 | ||
626 | kfree(file->private_data); | |
01122e06 | 627 | ctx->pos = key_hash_flash(c, &dent->key); |
1e51764a AB |
628 | file->private_data = dent; |
629 | cond_resched(); | |
630 | } | |
631 | ||
632 | out: | |
aeeb14f7 RW |
633 | kfree(file->private_data); |
634 | file->private_data = NULL; | |
635 | ||
f4f61d2c RW |
636 | if (encrypted) |
637 | fscrypt_fname_free_buffer(&fstr); | |
638 | ||
c83ed4c9 | 639 | if (err != -ENOENT) |
235c362b | 640 | ubifs_err(c, "cannot find next direntry, error %d", err); |
a00052a2 RW |
641 | else |
642 | /* | |
643 | * -ENOENT is a non-fatal error in this context, the TNC uses | |
644 | * it to indicate that the cursor moved past the current directory | |
645 | * and readdir() has to stop. | |
646 | */ | |
647 | err = 0; | |
648 | ||
1e51764a | 649 | |
605c912b | 650 | /* 2 is a special value indicating that there are no more direntries */ |
01122e06 | 651 | ctx->pos = 2; |
c83ed4c9 | 652 | return err; |
1e51764a AB |
653 | } |
654 | ||
1e51764a AB |
655 | /* Free saved readdir() state when the directory is closed */ |
656 | static int ubifs_dir_release(struct inode *dir, struct file *file) | |
657 | { | |
658 | kfree(file->private_data); | |
659 | file->private_data = NULL; | |
660 | return 0; | |
661 | } | |
662 | ||
663 | /** | |
82c1593c | 664 | * lock_2_inodes - a wrapper for locking two UBIFS inodes. |
1e51764a AB |
665 | * @inode1: first inode |
666 | * @inode2: second inode | |
82c1593c AB |
667 | * |
668 | * We do not implement any tricks to guarantee strict lock ordering, because | |
669 | * VFS has already done it for us on the @i_mutex. So this is just a simple | |
670 | * wrapper function. | |
1e51764a AB |
671 | */ |
672 | static void lock_2_inodes(struct inode *inode1, struct inode *inode2) | |
673 | { | |
82c1593c AB |
674 | mutex_lock_nested(&ubifs_inode(inode1)->ui_mutex, WB_MUTEX_1); |
675 | mutex_lock_nested(&ubifs_inode(inode2)->ui_mutex, WB_MUTEX_2); | |
1e51764a AB |
676 | } |
677 | ||
678 | /** | |
82c1593c | 679 | * unlock_2_inodes - a wrapper for unlocking two UBIFS inodes. |
1e51764a AB |
680 | * @inode1: first inode |
681 | * @inode2: second inode | |
682 | */ | |
683 | static void unlock_2_inodes(struct inode *inode1, struct inode *inode2) | |
684 | { | |
1e51764a | 685 | mutex_unlock(&ubifs_inode(inode2)->ui_mutex); |
82c1593c | 686 | mutex_unlock(&ubifs_inode(inode1)->ui_mutex); |
1e51764a AB |
687 | } |
688 | ||
689 | static int ubifs_link(struct dentry *old_dentry, struct inode *dir, | |
690 | struct dentry *dentry) | |
691 | { | |
692 | struct ubifs_info *c = dir->i_sb->s_fs_info; | |
2b0143b5 | 693 | struct inode *inode = d_inode(old_dentry); |
1e51764a AB |
694 | struct ubifs_inode *ui = ubifs_inode(inode); |
695 | struct ubifs_inode *dir_ui = ubifs_inode(dir); | |
696 | int err, sz_change = CALC_DENT_SIZE(dentry->d_name.len); | |
697 | struct ubifs_budget_req req = { .new_dent = 1, .dirtied_ino = 2, | |
dab4b4d2 | 698 | .dirtied_ino_d = ALIGN(ui->data_len, 8) }; |
f4f61d2c | 699 | struct fscrypt_name nm; |
1e51764a AB |
700 | |
701 | /* | |
702 | * Budget request settings: new direntry, changing the target inode, | |
703 | * changing the parent inode. | |
704 | */ | |
705 | ||
4cb2a01d AV |
706 | dbg_gen("dent '%pd' to ino %lu (nlink %d) in dir ino %lu", |
707 | dentry, inode->i_ino, | |
1e51764a | 708 | inode->i_nlink, dir->i_ino); |
6eb61d58 RW |
709 | ubifs_assert(c, inode_is_locked(dir)); |
710 | ubifs_assert(c, inode_is_locked(inode)); | |
8b3884a8 | 711 | |
5653878c EB |
712 | err = fscrypt_prepare_link(old_dentry, dir, dentry); |
713 | if (err) | |
714 | return err; | |
f4f61d2c RW |
715 | |
716 | err = fscrypt_setup_filename(dir, &dentry->d_name, 0, &nm); | |
1e51764a AB |
717 | if (err) |
718 | return err; | |
719 | ||
f4f61d2c RW |
720 | err = dbg_check_synced_i_size(c, inode); |
721 | if (err) | |
722 | goto out_fname; | |
723 | ||
1e51764a AB |
724 | err = ubifs_budget_space(c, &req); |
725 | if (err) | |
f4f61d2c | 726 | goto out_fname; |
1e51764a AB |
727 | |
728 | lock_2_inodes(dir, inode); | |
32fe905c RW |
729 | |
730 | /* Handle O_TMPFILE corner case, it is allowed to link a O_TMPFILE. */ | |
731 | if (inode->i_nlink == 0) | |
732 | ubifs_delete_orphan(c, inode->i_ino); | |
733 | ||
1e51764a | 734 | inc_nlink(inode); |
7de9c6ee | 735 | ihold(inode); |
607a11ad | 736 | inode->i_ctime = current_time(inode); |
1e51764a AB |
737 | dir->i_size += sz_change; |
738 | dir_ui->ui_size = dir->i_size; | |
739 | dir->i_mtime = dir->i_ctime = inode->i_ctime; | |
f4f61d2c | 740 | err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0); |
1e51764a AB |
741 | if (err) |
742 | goto out_cancel; | |
743 | unlock_2_inodes(dir, inode); | |
744 | ||
745 | ubifs_release_budget(c, &req); | |
746 | d_instantiate(dentry, inode); | |
f4f61d2c | 747 | fscrypt_free_filename(&nm); |
1e51764a AB |
748 | return 0; |
749 | ||
750 | out_cancel: | |
751 | dir->i_size -= sz_change; | |
752 | dir_ui->ui_size = dir->i_size; | |
753 | drop_nlink(inode); | |
32fe905c RW |
754 | if (inode->i_nlink == 0) |
755 | ubifs_add_orphan(c, inode->i_ino); | |
1e51764a AB |
756 | unlock_2_inodes(dir, inode); |
757 | ubifs_release_budget(c, &req); | |
758 | iput(inode); | |
f4f61d2c RW |
759 | out_fname: |
760 | fscrypt_free_filename(&nm); | |
1e51764a AB |
761 | return err; |
762 | } | |
763 | ||
764 | static int ubifs_unlink(struct inode *dir, struct dentry *dentry) | |
765 | { | |
766 | struct ubifs_info *c = dir->i_sb->s_fs_info; | |
2b0143b5 | 767 | struct inode *inode = d_inode(dentry); |
1e51764a | 768 | struct ubifs_inode *dir_ui = ubifs_inode(dir); |
f4f61d2c | 769 | int err, sz_change, budgeted = 1; |
1e51764a | 770 | struct ubifs_budget_req req = { .mod_dent = 1, .dirtied_ino = 2 }; |
c43be108 | 771 | unsigned int saved_nlink = inode->i_nlink; |
f4f61d2c | 772 | struct fscrypt_name nm; |
1e51764a AB |
773 | |
774 | /* | |
775 | * Budget request settings: deletion direntry, deletion inode (+1 for | |
776 | * @dirtied_ino), changing the parent directory inode. If budgeting | |
777 | * fails, go ahead anyway because we have extra space reserved for | |
778 | * deletions. | |
779 | */ | |
780 | ||
4cb2a01d AV |
781 | dbg_gen("dent '%pd' from ino %lu (nlink %d) in dir ino %lu", |
782 | dentry, inode->i_ino, | |
1e51764a | 783 | inode->i_nlink, dir->i_ino); |
f4f61d2c | 784 | |
f4f61d2c RW |
785 | err = fscrypt_setup_filename(dir, &dentry->d_name, 1, &nm); |
786 | if (err) | |
787 | return err; | |
788 | ||
9ca2d732 RW |
789 | err = ubifs_purge_xattrs(inode); |
790 | if (err) | |
791 | return err; | |
792 | ||
f4f61d2c RW |
793 | sz_change = CALC_DENT_SIZE(fname_len(&nm)); |
794 | ||
6eb61d58 RW |
795 | ubifs_assert(c, inode_is_locked(dir)); |
796 | ubifs_assert(c, inode_is_locked(inode)); | |
d808efb4 | 797 | err = dbg_check_synced_i_size(c, inode); |
1e51764a | 798 | if (err) |
f4f61d2c | 799 | goto out_fname; |
1e51764a AB |
800 | |
801 | err = ubifs_budget_space(c, &req); | |
802 | if (err) { | |
803 | if (err != -ENOSPC) | |
f4f61d2c | 804 | goto out_fname; |
1e51764a AB |
805 | budgeted = 0; |
806 | } | |
807 | ||
808 | lock_2_inodes(dir, inode); | |
607a11ad | 809 | inode->i_ctime = current_time(dir); |
1e51764a AB |
810 | drop_nlink(inode); |
811 | dir->i_size -= sz_change; | |
812 | dir_ui->ui_size = dir->i_size; | |
813 | dir->i_mtime = dir->i_ctime = inode->i_ctime; | |
f4f61d2c | 814 | err = ubifs_jnl_update(c, dir, &nm, inode, 1, 0); |
1e51764a AB |
815 | if (err) |
816 | goto out_cancel; | |
817 | unlock_2_inodes(dir, inode); | |
818 | ||
819 | if (budgeted) | |
820 | ubifs_release_budget(c, &req); | |
821 | else { | |
822 | /* We've deleted something - clean the "no space" flags */ | |
b137545c | 823 | c->bi.nospace = c->bi.nospace_rp = 0; |
1e51764a AB |
824 | smp_wmb(); |
825 | } | |
f4f61d2c | 826 | fscrypt_free_filename(&nm); |
1e51764a AB |
827 | return 0; |
828 | ||
829 | out_cancel: | |
830 | dir->i_size += sz_change; | |
831 | dir_ui->ui_size = dir->i_size; | |
c43be108 | 832 | set_nlink(inode, saved_nlink); |
1e51764a AB |
833 | unlock_2_inodes(dir, inode); |
834 | if (budgeted) | |
835 | ubifs_release_budget(c, &req); | |
f4f61d2c RW |
836 | out_fname: |
837 | fscrypt_free_filename(&nm); | |
1e51764a AB |
838 | return err; |
839 | } | |
840 | ||
841 | /** | |
842 | * check_dir_empty - check if a directory is empty or not. | |
1e51764a AB |
843 | * @dir: VFS inode object of the directory to check |
844 | * | |
845 | * This function checks if directory @dir is empty. Returns zero if the | |
846 | * directory is empty, %-ENOTEMPTY if it is not, and other negative error codes | |
b8f1da98 | 847 | * in case of errors. |
1e51764a | 848 | */ |
f6337d84 | 849 | int ubifs_check_dir_empty(struct inode *dir) |
1e51764a | 850 | { |
f6337d84 | 851 | struct ubifs_info *c = dir->i_sb->s_fs_info; |
f4f61d2c | 852 | struct fscrypt_name nm = { 0 }; |
1e51764a AB |
853 | struct ubifs_dent_node *dent; |
854 | union ubifs_key key; | |
855 | int err; | |
856 | ||
857 | lowest_dent_key(c, &key, dir->i_ino); | |
858 | dent = ubifs_tnc_next_ent(c, &key, &nm); | |
859 | if (IS_ERR(dent)) { | |
860 | err = PTR_ERR(dent); | |
861 | if (err == -ENOENT) | |
862 | err = 0; | |
863 | } else { | |
864 | kfree(dent); | |
865 | err = -ENOTEMPTY; | |
866 | } | |
867 | return err; | |
868 | } | |
869 | ||
870 | static int ubifs_rmdir(struct inode *dir, struct dentry *dentry) | |
871 | { | |
872 | struct ubifs_info *c = dir->i_sb->s_fs_info; | |
2b0143b5 | 873 | struct inode *inode = d_inode(dentry); |
f4f61d2c | 874 | int err, sz_change, budgeted = 1; |
1e51764a AB |
875 | struct ubifs_inode *dir_ui = ubifs_inode(dir); |
876 | struct ubifs_budget_req req = { .mod_dent = 1, .dirtied_ino = 2 }; | |
f4f61d2c | 877 | struct fscrypt_name nm; |
1e51764a AB |
878 | |
879 | /* | |
880 | * Budget request settings: deletion direntry, deletion inode and | |
881 | * changing the parent inode. If budgeting fails, go ahead anyway | |
882 | * because we have extra space reserved for deletions. | |
883 | */ | |
884 | ||
4cb2a01d AV |
885 | dbg_gen("directory '%pd', ino %lu in dir ino %lu", dentry, |
886 | inode->i_ino, dir->i_ino); | |
6eb61d58 RW |
887 | ubifs_assert(c, inode_is_locked(dir)); |
888 | ubifs_assert(c, inode_is_locked(inode)); | |
f6337d84 | 889 | err = ubifs_check_dir_empty(d_inode(dentry)); |
1e51764a AB |
890 | if (err) |
891 | return err; | |
892 | ||
f4f61d2c RW |
893 | err = fscrypt_setup_filename(dir, &dentry->d_name, 1, &nm); |
894 | if (err) | |
895 | return err; | |
896 | ||
9ca2d732 RW |
897 | err = ubifs_purge_xattrs(inode); |
898 | if (err) | |
899 | return err; | |
900 | ||
f4f61d2c RW |
901 | sz_change = CALC_DENT_SIZE(fname_len(&nm)); |
902 | ||
1e51764a AB |
903 | err = ubifs_budget_space(c, &req); |
904 | if (err) { | |
905 | if (err != -ENOSPC) | |
f4f61d2c | 906 | goto out_fname; |
1e51764a AB |
907 | budgeted = 0; |
908 | } | |
909 | ||
910 | lock_2_inodes(dir, inode); | |
607a11ad | 911 | inode->i_ctime = current_time(dir); |
1e51764a AB |
912 | clear_nlink(inode); |
913 | drop_nlink(dir); | |
914 | dir->i_size -= sz_change; | |
915 | dir_ui->ui_size = dir->i_size; | |
916 | dir->i_mtime = dir->i_ctime = inode->i_ctime; | |
f4f61d2c | 917 | err = ubifs_jnl_update(c, dir, &nm, inode, 1, 0); |
1e51764a AB |
918 | if (err) |
919 | goto out_cancel; | |
920 | unlock_2_inodes(dir, inode); | |
921 | ||
922 | if (budgeted) | |
923 | ubifs_release_budget(c, &req); | |
924 | else { | |
925 | /* We've deleted something - clean the "no space" flags */ | |
b137545c | 926 | c->bi.nospace = c->bi.nospace_rp = 0; |
1e51764a AB |
927 | smp_wmb(); |
928 | } | |
f4f61d2c | 929 | fscrypt_free_filename(&nm); |
1e51764a AB |
930 | return 0; |
931 | ||
932 | out_cancel: | |
933 | dir->i_size += sz_change; | |
934 | dir_ui->ui_size = dir->i_size; | |
935 | inc_nlink(dir); | |
c43be108 | 936 | set_nlink(inode, 2); |
1e51764a AB |
937 | unlock_2_inodes(dir, inode); |
938 | if (budgeted) | |
939 | ubifs_release_budget(c, &req); | |
f4f61d2c RW |
940 | out_fname: |
941 | fscrypt_free_filename(&nm); | |
1e51764a AB |
942 | return err; |
943 | } | |
944 | ||
18bb1db3 | 945 | static int ubifs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
1e51764a AB |
946 | { |
947 | struct inode *inode; | |
948 | struct ubifs_inode *dir_ui = ubifs_inode(dir); | |
949 | struct ubifs_info *c = dir->i_sb->s_fs_info; | |
f4f61d2c | 950 | int err, sz_change; |
182854b4 | 951 | struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1 }; |
f4f61d2c | 952 | struct fscrypt_name nm; |
1e51764a AB |
953 | |
954 | /* | |
955 | * Budget request settings: new inode, new direntry and changing parent | |
956 | * directory inode. | |
957 | */ | |
958 | ||
4cb2a01d AV |
959 | dbg_gen("dent '%pd', mode %#hx in dir ino %lu", |
960 | dentry, mode, dir->i_ino); | |
1e51764a AB |
961 | |
962 | err = ubifs_budget_space(c, &req); | |
963 | if (err) | |
964 | return err; | |
965 | ||
76786a0f | 966 | err = ubifs_prepare_create(dir, dentry, &nm); |
f4f61d2c RW |
967 | if (err) |
968 | goto out_budg; | |
969 | ||
970 | sz_change = CALC_DENT_SIZE(fname_len(&nm)); | |
971 | ||
1e51764a AB |
972 | inode = ubifs_new_inode(c, dir, S_IFDIR | mode); |
973 | if (IS_ERR(inode)) { | |
974 | err = PTR_ERR(inode); | |
f4f61d2c | 975 | goto out_fname; |
1e51764a AB |
976 | } |
977 | ||
d7f0b70d SN |
978 | err = ubifs_init_security(dir, inode, &dentry->d_name); |
979 | if (err) | |
9401a795 | 980 | goto out_inode; |
d7f0b70d | 981 | |
1e51764a AB |
982 | mutex_lock(&dir_ui->ui_mutex); |
983 | insert_inode_hash(inode); | |
984 | inc_nlink(inode); | |
985 | inc_nlink(dir); | |
986 | dir->i_size += sz_change; | |
987 | dir_ui->ui_size = dir->i_size; | |
988 | dir->i_mtime = dir->i_ctime = inode->i_ctime; | |
f4f61d2c | 989 | err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0); |
1e51764a | 990 | if (err) { |
235c362b | 991 | ubifs_err(c, "cannot create directory, error %d", err); |
1e51764a AB |
992 | goto out_cancel; |
993 | } | |
994 | mutex_unlock(&dir_ui->ui_mutex); | |
995 | ||
996 | ubifs_release_budget(c, &req); | |
997 | d_instantiate(dentry, inode); | |
f4f61d2c | 998 | fscrypt_free_filename(&nm); |
1e51764a AB |
999 | return 0; |
1000 | ||
1001 | out_cancel: | |
1002 | dir->i_size -= sz_change; | |
1003 | dir_ui->ui_size = dir->i_size; | |
1004 | drop_nlink(dir); | |
1005 | mutex_unlock(&dir_ui->ui_mutex); | |
9401a795 | 1006 | out_inode: |
1e51764a AB |
1007 | make_bad_inode(inode); |
1008 | iput(inode); | |
f4f61d2c RW |
1009 | out_fname: |
1010 | fscrypt_free_filename(&nm); | |
1e51764a AB |
1011 | out_budg: |
1012 | ubifs_release_budget(c, &req); | |
1013 | return err; | |
1014 | } | |
1015 | ||
1016 | static int ubifs_mknod(struct inode *dir, struct dentry *dentry, | |
1a67aafb | 1017 | umode_t mode, dev_t rdev) |
1e51764a AB |
1018 | { |
1019 | struct inode *inode; | |
1020 | struct ubifs_inode *ui; | |
1021 | struct ubifs_inode *dir_ui = ubifs_inode(dir); | |
1022 | struct ubifs_info *c = dir->i_sb->s_fs_info; | |
1023 | union ubifs_dev_desc *dev = NULL; | |
f4f61d2c | 1024 | int sz_change; |
1e51764a AB |
1025 | int err, devlen = 0; |
1026 | struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1, | |
dab4b4d2 | 1027 | .dirtied_ino = 1 }; |
f4f61d2c | 1028 | struct fscrypt_name nm; |
1e51764a AB |
1029 | |
1030 | /* | |
1031 | * Budget request settings: new inode, new direntry and changing parent | |
1032 | * directory inode. | |
1033 | */ | |
1034 | ||
4cb2a01d | 1035 | dbg_gen("dent '%pd' in dir ino %lu", dentry, dir->i_ino); |
1e51764a | 1036 | |
1e51764a AB |
1037 | if (S_ISBLK(mode) || S_ISCHR(mode)) { |
1038 | dev = kmalloc(sizeof(union ubifs_dev_desc), GFP_NOFS); | |
1039 | if (!dev) | |
1040 | return -ENOMEM; | |
1041 | devlen = ubifs_encode_dev(dev, rdev); | |
1042 | } | |
1043 | ||
4d35ca4f | 1044 | req.new_ino_d = ALIGN(devlen, 8); |
1e51764a AB |
1045 | err = ubifs_budget_space(c, &req); |
1046 | if (err) { | |
1047 | kfree(dev); | |
1048 | return err; | |
1049 | } | |
1050 | ||
76786a0f | 1051 | err = ubifs_prepare_create(dir, dentry, &nm); |
63ed6573 RW |
1052 | if (err) { |
1053 | kfree(dev); | |
f4f61d2c | 1054 | goto out_budg; |
63ed6573 | 1055 | } |
f4f61d2c RW |
1056 | |
1057 | sz_change = CALC_DENT_SIZE(fname_len(&nm)); | |
1058 | ||
1e51764a AB |
1059 | inode = ubifs_new_inode(c, dir, mode); |
1060 | if (IS_ERR(inode)) { | |
1061 | kfree(dev); | |
1062 | err = PTR_ERR(inode); | |
f4f61d2c | 1063 | goto out_fname; |
1e51764a AB |
1064 | } |
1065 | ||
1066 | init_special_inode(inode, inode->i_mode, rdev); | |
1067 | inode->i_size = ubifs_inode(inode)->ui_size = devlen; | |
1068 | ui = ubifs_inode(inode); | |
1069 | ui->data = dev; | |
1070 | ui->data_len = devlen; | |
1071 | ||
d7f0b70d SN |
1072 | err = ubifs_init_security(dir, inode, &dentry->d_name); |
1073 | if (err) | |
9401a795 | 1074 | goto out_inode; |
d7f0b70d | 1075 | |
1e51764a AB |
1076 | mutex_lock(&dir_ui->ui_mutex); |
1077 | dir->i_size += sz_change; | |
1078 | dir_ui->ui_size = dir->i_size; | |
1079 | dir->i_mtime = dir->i_ctime = inode->i_ctime; | |
f4f61d2c | 1080 | err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0); |
1e51764a AB |
1081 | if (err) |
1082 | goto out_cancel; | |
1083 | mutex_unlock(&dir_ui->ui_mutex); | |
1084 | ||
1085 | ubifs_release_budget(c, &req); | |
1086 | insert_inode_hash(inode); | |
1087 | d_instantiate(dentry, inode); | |
f4f61d2c | 1088 | fscrypt_free_filename(&nm); |
1e51764a AB |
1089 | return 0; |
1090 | ||
1091 | out_cancel: | |
1092 | dir->i_size -= sz_change; | |
1093 | dir_ui->ui_size = dir->i_size; | |
1094 | mutex_unlock(&dir_ui->ui_mutex); | |
9401a795 | 1095 | out_inode: |
1e51764a AB |
1096 | make_bad_inode(inode); |
1097 | iput(inode); | |
f4f61d2c RW |
1098 | out_fname: |
1099 | fscrypt_free_filename(&nm); | |
1e51764a AB |
1100 | out_budg: |
1101 | ubifs_release_budget(c, &req); | |
1102 | return err; | |
1103 | } | |
1104 | ||
1105 | static int ubifs_symlink(struct inode *dir, struct dentry *dentry, | |
1106 | const char *symname) | |
1107 | { | |
1108 | struct inode *inode; | |
1109 | struct ubifs_inode *ui; | |
1110 | struct ubifs_inode *dir_ui = ubifs_inode(dir); | |
1111 | struct ubifs_info *c = dir->i_sb->s_fs_info; | |
00ee8b60 | 1112 | int err, sz_change, len = strlen(symname); |
0e4dda29 | 1113 | struct fscrypt_str disk_link; |
1e51764a | 1114 | struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1, |
dab4b4d2 AB |
1115 | .new_ino_d = ALIGN(len, 8), |
1116 | .dirtied_ino = 1 }; | |
ca7f85be RW |
1117 | struct fscrypt_name nm; |
1118 | ||
0e4dda29 EB |
1119 | dbg_gen("dent '%pd', target '%s' in dir ino %lu", dentry, |
1120 | symname, dir->i_ino); | |
ca7f85be | 1121 | |
0e4dda29 EB |
1122 | err = fscrypt_prepare_symlink(dir, symname, len, UBIFS_MAX_INO_DATA, |
1123 | &disk_link); | |
1124 | if (err) | |
1125 | return err; | |
1e51764a AB |
1126 | |
1127 | /* | |
1128 | * Budget request settings: new inode, new direntry and changing parent | |
1129 | * directory inode. | |
1130 | */ | |
1e51764a AB |
1131 | err = ubifs_budget_space(c, &req); |
1132 | if (err) | |
1133 | return err; | |
1134 | ||
76786a0f | 1135 | err = ubifs_prepare_create(dir, dentry, &nm); |
ca7f85be RW |
1136 | if (err) |
1137 | goto out_budg; | |
1138 | ||
00ee8b60 RW |
1139 | sz_change = CALC_DENT_SIZE(fname_len(&nm)); |
1140 | ||
1e51764a AB |
1141 | inode = ubifs_new_inode(c, dir, S_IFLNK | S_IRWXUGO); |
1142 | if (IS_ERR(inode)) { | |
1143 | err = PTR_ERR(inode); | |
ca7f85be | 1144 | goto out_fname; |
1e51764a AB |
1145 | } |
1146 | ||
1147 | ui = ubifs_inode(inode); | |
ca7f85be | 1148 | ui->data = kmalloc(disk_link.len, GFP_NOFS); |
1e51764a AB |
1149 | if (!ui->data) { |
1150 | err = -ENOMEM; | |
1151 | goto out_inode; | |
1152 | } | |
1153 | ||
0e4dda29 EB |
1154 | if (IS_ENCRYPTED(inode)) { |
1155 | disk_link.name = ui->data; /* encrypt directly into ui->data */ | |
1156 | err = fscrypt_encrypt_symlink(inode, symname, len, &disk_link); | |
6b46d444 | 1157 | if (err) |
ca7f85be | 1158 | goto out_inode; |
ca7f85be | 1159 | } else { |
0e4dda29 | 1160 | memcpy(ui->data, disk_link.name, disk_link.len); |
ca7f85be RW |
1161 | inode->i_link = ui->data; |
1162 | } | |
1163 | ||
1e51764a AB |
1164 | /* |
1165 | * The terminating zero byte is not written to the flash media and it | |
1166 | * is put just to make later in-memory string processing simpler. Thus, | |
0e4dda29 | 1167 | * data length is @disk_link.len - 1, not @disk_link.len. |
1e51764a | 1168 | */ |
ca7f85be RW |
1169 | ui->data_len = disk_link.len - 1; |
1170 | inode->i_size = ubifs_inode(inode)->ui_size = disk_link.len - 1; | |
1e51764a | 1171 | |
d7f0b70d SN |
1172 | err = ubifs_init_security(dir, inode, &dentry->d_name); |
1173 | if (err) | |
9401a795 | 1174 | goto out_inode; |
d7f0b70d | 1175 | |
1e51764a AB |
1176 | mutex_lock(&dir_ui->ui_mutex); |
1177 | dir->i_size += sz_change; | |
1178 | dir_ui->ui_size = dir->i_size; | |
1179 | dir->i_mtime = dir->i_ctime = inode->i_ctime; | |
ca7f85be | 1180 | err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0); |
1e51764a AB |
1181 | if (err) |
1182 | goto out_cancel; | |
1183 | mutex_unlock(&dir_ui->ui_mutex); | |
1184 | ||
1e51764a AB |
1185 | insert_inode_hash(inode); |
1186 | d_instantiate(dentry, inode); | |
6b46d444 EB |
1187 | err = 0; |
1188 | goto out_fname; | |
1e51764a AB |
1189 | |
1190 | out_cancel: | |
1191 | dir->i_size -= sz_change; | |
1192 | dir_ui->ui_size = dir->i_size; | |
1193 | mutex_unlock(&dir_ui->ui_mutex); | |
1194 | out_inode: | |
1195 | make_bad_inode(inode); | |
1196 | iput(inode); | |
ca7f85be RW |
1197 | out_fname: |
1198 | fscrypt_free_filename(&nm); | |
1e51764a AB |
1199 | out_budg: |
1200 | ubifs_release_budget(c, &req); | |
1201 | return err; | |
1202 | } | |
1203 | ||
1204 | /** | |
9e0a1fff | 1205 | * lock_4_inodes - a wrapper for locking three UBIFS inodes. |
1e51764a AB |
1206 | * @inode1: first inode |
1207 | * @inode2: second inode | |
1208 | * @inode3: third inode | |
9e0a1fff | 1209 | * @inode4: fouth inode |
1e51764a | 1210 | * |
82c1593c | 1211 | * This function is used for 'ubifs_rename()' and @inode1 may be the same as |
9e0a1fff | 1212 | * @inode2 whereas @inode3 and @inode4 may be %NULL. |
82c1593c AB |
1213 | * |
1214 | * We do not implement any tricks to guarantee strict lock ordering, because | |
1215 | * VFS has already done it for us on the @i_mutex. So this is just a simple | |
1216 | * wrapper function. | |
1e51764a | 1217 | */ |
9e0a1fff RW |
1218 | static void lock_4_inodes(struct inode *inode1, struct inode *inode2, |
1219 | struct inode *inode3, struct inode *inode4) | |
1e51764a | 1220 | { |
82c1593c AB |
1221 | mutex_lock_nested(&ubifs_inode(inode1)->ui_mutex, WB_MUTEX_1); |
1222 | if (inode2 != inode1) | |
1223 | mutex_lock_nested(&ubifs_inode(inode2)->ui_mutex, WB_MUTEX_2); | |
1224 | if (inode3) | |
1225 | mutex_lock_nested(&ubifs_inode(inode3)->ui_mutex, WB_MUTEX_3); | |
9e0a1fff RW |
1226 | if (inode4) |
1227 | mutex_lock_nested(&ubifs_inode(inode4)->ui_mutex, WB_MUTEX_4); | |
1e51764a AB |
1228 | } |
1229 | ||
1230 | /** | |
9e0a1fff | 1231 | * unlock_4_inodes - a wrapper for unlocking three UBIFS inodes for rename. |
1e51764a AB |
1232 | * @inode1: first inode |
1233 | * @inode2: second inode | |
1234 | * @inode3: third inode | |
9e0a1fff | 1235 | * @inode4: fouth inode |
1e51764a | 1236 | */ |
9e0a1fff RW |
1237 | static void unlock_4_inodes(struct inode *inode1, struct inode *inode2, |
1238 | struct inode *inode3, struct inode *inode4) | |
1e51764a | 1239 | { |
9e0a1fff RW |
1240 | if (inode4) |
1241 | mutex_unlock(&ubifs_inode(inode4)->ui_mutex); | |
1e51764a AB |
1242 | if (inode3) |
1243 | mutex_unlock(&ubifs_inode(inode3)->ui_mutex); | |
82c1593c AB |
1244 | if (inode1 != inode2) |
1245 | mutex_unlock(&ubifs_inode(inode2)->ui_mutex); | |
1246 | mutex_unlock(&ubifs_inode(inode1)->ui_mutex); | |
1e51764a AB |
1247 | } |
1248 | ||
390975ac RW |
1249 | static int do_rename(struct inode *old_dir, struct dentry *old_dentry, |
1250 | struct inode *new_dir, struct dentry *new_dentry, | |
1251 | unsigned int flags) | |
1e51764a AB |
1252 | { |
1253 | struct ubifs_info *c = old_dir->i_sb->s_fs_info; | |
2b0143b5 DH |
1254 | struct inode *old_inode = d_inode(old_dentry); |
1255 | struct inode *new_inode = d_inode(new_dentry); | |
9e0a1fff | 1256 | struct inode *whiteout = NULL; |
1e51764a | 1257 | struct ubifs_inode *old_inode_ui = ubifs_inode(old_inode); |
9e0a1fff | 1258 | struct ubifs_inode *whiteout_ui = NULL; |
1e51764a AB |
1259 | int err, release, sync = 0, move = (new_dir != old_dir); |
1260 | int is_dir = S_ISDIR(old_inode->i_mode); | |
f4f61d2c | 1261 | int unlink = !!new_inode, new_sz, old_sz; |
1e51764a AB |
1262 | struct ubifs_budget_req req = { .new_dent = 1, .mod_dent = 1, |
1263 | .dirtied_ino = 3 }; | |
1264 | struct ubifs_budget_req ino_req = { .dirtied_ino = 1, | |
dab4b4d2 | 1265 | .dirtied_ino_d = ALIGN(old_inode_ui->data_len, 8) }; |
95582b00 | 1266 | struct timespec64 time; |
3f649ab7 | 1267 | unsigned int saved_nlink; |
f4f61d2c | 1268 | struct fscrypt_name old_nm, new_nm; |
1e51764a AB |
1269 | |
1270 | /* | |
1271 | * Budget request settings: deletion direntry, new direntry, removing | |
1272 | * the old inode, and changing old and new parent directory inodes. | |
1273 | * | |
1274 | * However, this operation also marks the target inode as dirty and | |
1275 | * does not write it, so we allocate budget for the target inode | |
1276 | * separately. | |
1277 | */ | |
1278 | ||
9e0a1fff | 1279 | dbg_gen("dent '%pd' ino %lu in dir ino %lu to dent '%pd' in dir ino %lu flags 0x%x", |
4cb2a01d | 1280 | old_dentry, old_inode->i_ino, old_dir->i_ino, |
9e0a1fff RW |
1281 | new_dentry, new_dir->i_ino, flags); |
1282 | ||
9ca2d732 | 1283 | if (unlink) { |
6eb61d58 | 1284 | ubifs_assert(c, inode_is_locked(new_inode)); |
82c1593c | 1285 | |
9ca2d732 RW |
1286 | err = ubifs_purge_xattrs(new_inode); |
1287 | if (err) | |
1288 | return err; | |
1289 | } | |
1290 | ||
1e51764a | 1291 | if (unlink && is_dir) { |
f6337d84 | 1292 | err = ubifs_check_dir_empty(new_inode); |
1e51764a AB |
1293 | if (err) |
1294 | return err; | |
1295 | } | |
1296 | ||
f4f61d2c | 1297 | err = fscrypt_setup_filename(old_dir, &old_dentry->d_name, 0, &old_nm); |
1e51764a AB |
1298 | if (err) |
1299 | return err; | |
f4f61d2c RW |
1300 | |
1301 | err = fscrypt_setup_filename(new_dir, &new_dentry->d_name, 0, &new_nm); | |
1302 | if (err) { | |
1303 | fscrypt_free_filename(&old_nm); | |
1304 | return err; | |
1305 | } | |
1306 | ||
1307 | new_sz = CALC_DENT_SIZE(fname_len(&new_nm)); | |
1308 | old_sz = CALC_DENT_SIZE(fname_len(&old_nm)); | |
1309 | ||
1310 | err = ubifs_budget_space(c, &req); | |
1311 | if (err) { | |
1312 | fscrypt_free_filename(&old_nm); | |
1313 | fscrypt_free_filename(&new_nm); | |
1314 | return err; | |
1315 | } | |
1e51764a AB |
1316 | err = ubifs_budget_space(c, &ino_req); |
1317 | if (err) { | |
f4f61d2c RW |
1318 | fscrypt_free_filename(&old_nm); |
1319 | fscrypt_free_filename(&new_nm); | |
1e51764a AB |
1320 | ubifs_release_budget(c, &req); |
1321 | return err; | |
1322 | } | |
1323 | ||
9e0a1fff RW |
1324 | if (flags & RENAME_WHITEOUT) { |
1325 | union ubifs_dev_desc *dev = NULL; | |
1326 | ||
1327 | dev = kmalloc(sizeof(union ubifs_dev_desc), GFP_NOFS); | |
1328 | if (!dev) { | |
bb50c632 HL |
1329 | err = -ENOMEM; |
1330 | goto out_release; | |
9e0a1fff RW |
1331 | } |
1332 | ||
1333 | err = do_tmpfile(old_dir, old_dentry, S_IFCHR | WHITEOUT_MODE, &whiteout); | |
1334 | if (err) { | |
9e0a1fff | 1335 | kfree(dev); |
bb50c632 | 1336 | goto out_release; |
9e0a1fff RW |
1337 | } |
1338 | ||
1339 | whiteout->i_state |= I_LINKABLE; | |
1340 | whiteout_ui = ubifs_inode(whiteout); | |
1341 | whiteout_ui->data = dev; | |
1342 | whiteout_ui->data_len = ubifs_encode_dev(dev, MKDEV(0, 0)); | |
6eb61d58 | 1343 | ubifs_assert(c, !whiteout_ui->dirty); |
9e0a1fff RW |
1344 | } |
1345 | ||
1346 | lock_4_inodes(old_dir, new_dir, new_inode, whiteout); | |
1e51764a AB |
1347 | |
1348 | /* | |
1349 | * Like most other Unix systems, set the @i_ctime for inodes on a | |
1350 | * rename. | |
1351 | */ | |
607a11ad | 1352 | time = current_time(old_dir); |
1e51764a AB |
1353 | old_inode->i_ctime = time; |
1354 | ||
1355 | /* We must adjust parent link count when renaming directories */ | |
1356 | if (is_dir) { | |
1357 | if (move) { | |
1358 | /* | |
1359 | * @old_dir loses a link because we are moving | |
1360 | * @old_inode to a different directory. | |
1361 | */ | |
1362 | drop_nlink(old_dir); | |
1363 | /* | |
1364 | * @new_dir only gains a link if we are not also | |
1365 | * overwriting an existing directory. | |
1366 | */ | |
1367 | if (!unlink) | |
1368 | inc_nlink(new_dir); | |
1369 | } else { | |
1370 | /* | |
1371 | * @old_inode is not moving to a different directory, | |
1372 | * but @old_dir still loses a link if we are | |
1373 | * overwriting an existing directory. | |
1374 | */ | |
1375 | if (unlink) | |
1376 | drop_nlink(old_dir); | |
1377 | } | |
1378 | } | |
1379 | ||
1380 | old_dir->i_size -= old_sz; | |
1381 | ubifs_inode(old_dir)->ui_size = old_dir->i_size; | |
1382 | old_dir->i_mtime = old_dir->i_ctime = time; | |
1383 | new_dir->i_mtime = new_dir->i_ctime = time; | |
1384 | ||
1385 | /* | |
1386 | * And finally, if we unlinked a direntry which happened to have the | |
1387 | * same name as the moved direntry, we have to decrement @i_nlink of | |
1388 | * the unlinked inode and change its ctime. | |
1389 | */ | |
1390 | if (unlink) { | |
1391 | /* | |
1392 | * Directories cannot have hard-links, so if this is a | |
c43be108 | 1393 | * directory, just clear @i_nlink. |
1e51764a | 1394 | */ |
c43be108 | 1395 | saved_nlink = new_inode->i_nlink; |
1e51764a | 1396 | if (is_dir) |
c43be108 AB |
1397 | clear_nlink(new_inode); |
1398 | else | |
1e51764a AB |
1399 | drop_nlink(new_inode); |
1400 | new_inode->i_ctime = time; | |
1e51764a AB |
1401 | } else { |
1402 | new_dir->i_size += new_sz; | |
1403 | ubifs_inode(new_dir)->ui_size = new_dir->i_size; | |
1404 | } | |
1405 | ||
1406 | /* | |
1407 | * Do not ask 'ubifs_jnl_rename()' to flush write-buffer if @old_inode | |
1408 | * is dirty, because this will be done later on at the end of | |
1409 | * 'ubifs_rename()'. | |
1410 | */ | |
1411 | if (IS_SYNC(old_inode)) { | |
1412 | sync = IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir); | |
1413 | if (unlink && IS_SYNC(new_inode)) | |
1414 | sync = 1; | |
1415 | } | |
9e0a1fff RW |
1416 | |
1417 | if (whiteout) { | |
1418 | struct ubifs_budget_req wht_req = { .dirtied_ino = 1, | |
1419 | .dirtied_ino_d = \ | |
1420 | ALIGN(ubifs_inode(whiteout)->data_len, 8) }; | |
1421 | ||
1422 | err = ubifs_budget_space(c, &wht_req); | |
1423 | if (err) { | |
9e0a1fff RW |
1424 | kfree(whiteout_ui->data); |
1425 | whiteout_ui->data_len = 0; | |
1426 | iput(whiteout); | |
bb50c632 | 1427 | goto out_release; |
9e0a1fff RW |
1428 | } |
1429 | ||
1430 | inc_nlink(whiteout); | |
1431 | mark_inode_dirty(whiteout); | |
1432 | whiteout->i_state &= ~I_LINKABLE; | |
1433 | iput(whiteout); | |
1434 | } | |
1435 | ||
f4f61d2c RW |
1436 | err = ubifs_jnl_rename(c, old_dir, old_inode, &old_nm, new_dir, |
1437 | new_inode, &new_nm, whiteout, sync); | |
1e51764a AB |
1438 | if (err) |
1439 | goto out_cancel; | |
1440 | ||
9e0a1fff | 1441 | unlock_4_inodes(old_dir, new_dir, new_inode, whiteout); |
1e51764a AB |
1442 | ubifs_release_budget(c, &req); |
1443 | ||
1444 | mutex_lock(&old_inode_ui->ui_mutex); | |
1445 | release = old_inode_ui->dirty; | |
1446 | mark_inode_dirty_sync(old_inode); | |
1447 | mutex_unlock(&old_inode_ui->ui_mutex); | |
1448 | ||
1449 | if (release) | |
1450 | ubifs_release_budget(c, &ino_req); | |
1451 | if (IS_SYNC(old_inode)) | |
a9185b41 | 1452 | err = old_inode->i_sb->s_op->write_inode(old_inode, NULL); |
f4f61d2c RW |
1453 | |
1454 | fscrypt_free_filename(&old_nm); | |
1455 | fscrypt_free_filename(&new_nm); | |
1e51764a AB |
1456 | return err; |
1457 | ||
1458 | out_cancel: | |
1459 | if (unlink) { | |
c43be108 | 1460 | set_nlink(new_inode, saved_nlink); |
1e51764a AB |
1461 | } else { |
1462 | new_dir->i_size -= new_sz; | |
1463 | ubifs_inode(new_dir)->ui_size = new_dir->i_size; | |
1464 | } | |
1465 | old_dir->i_size += old_sz; | |
1466 | ubifs_inode(old_dir)->ui_size = old_dir->i_size; | |
1467 | if (is_dir) { | |
1468 | if (move) { | |
1469 | inc_nlink(old_dir); | |
1470 | if (!unlink) | |
1471 | drop_nlink(new_dir); | |
1472 | } else { | |
1473 | if (unlink) | |
1474 | inc_nlink(old_dir); | |
1475 | } | |
1476 | } | |
9e0a1fff RW |
1477 | if (whiteout) { |
1478 | drop_nlink(whiteout); | |
1479 | iput(whiteout); | |
1480 | } | |
1481 | unlock_4_inodes(old_dir, new_dir, new_inode, whiteout); | |
bb50c632 | 1482 | out_release: |
1e51764a AB |
1483 | ubifs_release_budget(c, &ino_req); |
1484 | ubifs_release_budget(c, &req); | |
f4f61d2c RW |
1485 | fscrypt_free_filename(&old_nm); |
1486 | fscrypt_free_filename(&new_nm); | |
1e51764a AB |
1487 | return err; |
1488 | } | |
1489 | ||
9ec64962 RW |
1490 | static int ubifs_xrename(struct inode *old_dir, struct dentry *old_dentry, |
1491 | struct inode *new_dir, struct dentry *new_dentry) | |
1492 | { | |
1493 | struct ubifs_info *c = old_dir->i_sb->s_fs_info; | |
1494 | struct ubifs_budget_req req = { .new_dent = 1, .mod_dent = 1, | |
1495 | .dirtied_ino = 2 }; | |
1496 | int sync = IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir); | |
1497 | struct inode *fst_inode = d_inode(old_dentry); | |
1498 | struct inode *snd_inode = d_inode(new_dentry); | |
95582b00 | 1499 | struct timespec64 time; |
9ec64962 | 1500 | int err; |
f4f61d2c | 1501 | struct fscrypt_name fst_nm, snd_nm; |
9ec64962 | 1502 | |
6eb61d58 | 1503 | ubifs_assert(c, fst_inode && snd_inode); |
9ec64962 | 1504 | |
f4f61d2c RW |
1505 | err = fscrypt_setup_filename(old_dir, &old_dentry->d_name, 0, &fst_nm); |
1506 | if (err) | |
1507 | return err; | |
1508 | ||
1509 | err = fscrypt_setup_filename(new_dir, &new_dentry->d_name, 0, &snd_nm); | |
1510 | if (err) { | |
1511 | fscrypt_free_filename(&fst_nm); | |
1512 | return err; | |
1513 | } | |
1514 | ||
9ec64962 RW |
1515 | lock_4_inodes(old_dir, new_dir, NULL, NULL); |
1516 | ||
607a11ad | 1517 | time = current_time(old_dir); |
9ec64962 RW |
1518 | fst_inode->i_ctime = time; |
1519 | snd_inode->i_ctime = time; | |
1520 | old_dir->i_mtime = old_dir->i_ctime = time; | |
1521 | new_dir->i_mtime = new_dir->i_ctime = time; | |
1522 | ||
1523 | if (old_dir != new_dir) { | |
1524 | if (S_ISDIR(fst_inode->i_mode) && !S_ISDIR(snd_inode->i_mode)) { | |
1525 | inc_nlink(new_dir); | |
1526 | drop_nlink(old_dir); | |
1527 | } | |
1528 | else if (!S_ISDIR(fst_inode->i_mode) && S_ISDIR(snd_inode->i_mode)) { | |
1529 | drop_nlink(new_dir); | |
1530 | inc_nlink(old_dir); | |
1531 | } | |
1532 | } | |
1533 | ||
f4f61d2c RW |
1534 | err = ubifs_jnl_xrename(c, old_dir, fst_inode, &fst_nm, new_dir, |
1535 | snd_inode, &snd_nm, sync); | |
9ec64962 RW |
1536 | |
1537 | unlock_4_inodes(old_dir, new_dir, NULL, NULL); | |
1538 | ubifs_release_budget(c, &req); | |
1539 | ||
f4f61d2c RW |
1540 | fscrypt_free_filename(&fst_nm); |
1541 | fscrypt_free_filename(&snd_nm); | |
9ec64962 RW |
1542 | return err; |
1543 | } | |
1544 | ||
390975ac | 1545 | static int ubifs_rename(struct inode *old_dir, struct dentry *old_dentry, |
9ec64962 RW |
1546 | struct inode *new_dir, struct dentry *new_dentry, |
1547 | unsigned int flags) | |
1548 | { | |
0c1ad524 | 1549 | int err; |
6eb61d58 | 1550 | struct ubifs_info *c = old_dir->i_sb->s_fs_info; |
0c1ad524 | 1551 | |
9ec64962 RW |
1552 | if (flags & ~(RENAME_NOREPLACE | RENAME_WHITEOUT | RENAME_EXCHANGE)) |
1553 | return -EINVAL; | |
1554 | ||
6eb61d58 RW |
1555 | ubifs_assert(c, inode_is_locked(old_dir)); |
1556 | ubifs_assert(c, inode_is_locked(new_dir)); | |
9ec64962 | 1557 | |
0c1ad524 EB |
1558 | err = fscrypt_prepare_rename(old_dir, old_dentry, new_dir, new_dentry, |
1559 | flags); | |
1560 | if (err) | |
1561 | return err; | |
1562 | ||
9ec64962 RW |
1563 | if (flags & RENAME_EXCHANGE) |
1564 | return ubifs_xrename(old_dir, old_dentry, new_dir, new_dentry); | |
1565 | ||
390975ac | 1566 | return do_rename(old_dir, old_dentry, new_dir, new_dentry, flags); |
9ec64962 RW |
1567 | } |
1568 | ||
a528d35e DH |
1569 | int ubifs_getattr(const struct path *path, struct kstat *stat, |
1570 | u32 request_mask, unsigned int flags) | |
1e51764a AB |
1571 | { |
1572 | loff_t size; | |
a528d35e | 1573 | struct inode *inode = d_inode(path->dentry); |
1e51764a AB |
1574 | struct ubifs_inode *ui = ubifs_inode(inode); |
1575 | ||
1576 | mutex_lock(&ui->ui_mutex); | |
a02a6eba RW |
1577 | |
1578 | if (ui->flags & UBIFS_APPEND_FL) | |
1579 | stat->attributes |= STATX_ATTR_APPEND; | |
1580 | if (ui->flags & UBIFS_COMPR_FL) | |
1581 | stat->attributes |= STATX_ATTR_COMPRESSED; | |
1582 | if (ui->flags & UBIFS_CRYPT_FL) | |
1583 | stat->attributes |= STATX_ATTR_ENCRYPTED; | |
1584 | if (ui->flags & UBIFS_IMMUTABLE_FL) | |
1585 | stat->attributes |= STATX_ATTR_IMMUTABLE; | |
1586 | ||
1587 | stat->attributes_mask |= (STATX_ATTR_APPEND | | |
1588 | STATX_ATTR_COMPRESSED | | |
1589 | STATX_ATTR_ENCRYPTED | | |
1590 | STATX_ATTR_IMMUTABLE); | |
1591 | ||
6d42e7e9 | 1592 | generic_fillattr(inode, stat); |
1e51764a AB |
1593 | stat->blksize = UBIFS_BLOCK_SIZE; |
1594 | stat->size = ui->ui_size; | |
1595 | ||
1596 | /* | |
1597 | * Unfortunately, the 'stat()' system call was designed for block | |
1598 | * device based file systems, and it is not appropriate for UBIFS, | |
1599 | * because UBIFS does not have notion of "block". For example, it is | |
1600 | * difficult to tell how many block a directory takes - it actually | |
1601 | * takes less than 300 bytes, but we have to round it to block size, | |
1602 | * which introduces large mistake. This makes utilities like 'du' to | |
1603 | * report completely senseless numbers. This is the reason why UBIFS | |
1604 | * goes the same way as JFFS2 - it reports zero blocks for everything | |
1605 | * but regular files, which makes more sense than reporting completely | |
1606 | * wrong sizes. | |
1607 | */ | |
1608 | if (S_ISREG(inode->i_mode)) { | |
1609 | size = ui->xattr_size; | |
1610 | size += stat->size; | |
1611 | size = ALIGN(size, UBIFS_BLOCK_SIZE); | |
1612 | /* | |
1613 | * Note, user-space expects 512-byte blocks count irrespectively | |
1614 | * of what was reported in @stat->size. | |
1615 | */ | |
1616 | stat->blocks = size >> 9; | |
1617 | } else | |
1618 | stat->blocks = 0; | |
1619 | mutex_unlock(&ui->ui_mutex); | |
1620 | return 0; | |
1621 | } | |
1622 | ||
e8b81566 | 1623 | const struct inode_operations ubifs_dir_inode_operations = { |
1e51764a AB |
1624 | .lookup = ubifs_lookup, |
1625 | .create = ubifs_create, | |
1626 | .link = ubifs_link, | |
1627 | .symlink = ubifs_symlink, | |
1628 | .unlink = ubifs_unlink, | |
1629 | .mkdir = ubifs_mkdir, | |
1630 | .rmdir = ubifs_rmdir, | |
1631 | .mknod = ubifs_mknod, | |
390975ac | 1632 | .rename = ubifs_rename, |
1e51764a AB |
1633 | .setattr = ubifs_setattr, |
1634 | .getattr = ubifs_getattr, | |
1e51764a | 1635 | .listxattr = ubifs_listxattr, |
8c1c5f26 | 1636 | .update_time = ubifs_update_time, |
474b9370 | 1637 | .tmpfile = ubifs_tmpfile, |
1e51764a AB |
1638 | }; |
1639 | ||
e8b81566 | 1640 | const struct file_operations ubifs_dir_operations = { |
01122e06 | 1641 | .llseek = generic_file_llseek, |
1e51764a AB |
1642 | .release = ubifs_dir_release, |
1643 | .read = generic_read_dir, | |
c51da20c | 1644 | .iterate_shared = ubifs_readdir, |
1e51764a AB |
1645 | .fsync = ubifs_fsync, |
1646 | .unlocked_ioctl = ubifs_ioctl, | |
1647 | #ifdef CONFIG_COMPAT | |
1648 | .compat_ioctl = ubifs_compat_ioctl, | |
1649 | #endif | |
1650 | }; |