Commit | Line | Data |
---|---|---|
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 | |
a0c51565 | 71 | * @is_xattr: whether the inode is xattr inode |
1e51764a AB |
72 | * |
73 | * This function finds an unused inode number, allocates new inode and | |
74 | * initializes it. Returns new inode in case of success and an error code in | |
75 | * case of failure. | |
76 | */ | |
d475a507 | 77 | struct inode *ubifs_new_inode(struct ubifs_info *c, struct inode *dir, |
a0c51565 | 78 | umode_t mode, bool is_xattr) |
1e51764a | 79 | { |
d475a507 | 80 | int err; |
1e51764a AB |
81 | struct inode *inode; |
82 | struct ubifs_inode *ui; | |
d475a507 RW |
83 | bool encrypted = false; |
84 | ||
1e51764a AB |
85 | inode = new_inode(c->vfs_sb); |
86 | ui = ubifs_inode(inode); | |
87 | if (!inode) | |
88 | return ERR_PTR(-ENOMEM); | |
89 | ||
90 | /* | |
91 | * Set 'S_NOCMTIME' to prevent VFS form updating [mc]time of inodes and | |
92 | * marking them dirty in file write path (see 'file_update_time()'). | |
93 | * UBIFS has to fully control "clean <-> dirty" transitions of inodes | |
94 | * to make budgeting work. | |
95 | */ | |
12e776a0 | 96 | inode->i_flags |= S_NOCMTIME; |
1e51764a | 97 | |
f2d40141 | 98 | inode_init_owner(&nop_mnt_idmap, inode, dir, mode); |
e4cfef33 | 99 | simple_inode_init_ts(inode); |
1e51764a | 100 | inode->i_mapping->nrpages = 0; |
1e51764a | 101 | |
a0c51565 ZC |
102 | if (!is_xattr) { |
103 | err = fscrypt_prepare_new_inode(dir, inode, &encrypted); | |
104 | if (err) { | |
105 | ubifs_err(c, "fscrypt_prepare_new_inode failed: %i", err); | |
106 | goto out_iput; | |
107 | } | |
4c030fa8 EB |
108 | } |
109 | ||
1e51764a AB |
110 | switch (mode & S_IFMT) { |
111 | case S_IFREG: | |
112 | inode->i_mapping->a_ops = &ubifs_file_address_operations; | |
113 | inode->i_op = &ubifs_file_inode_operations; | |
114 | inode->i_fop = &ubifs_file_operations; | |
115 | break; | |
116 | case S_IFDIR: | |
117 | inode->i_op = &ubifs_dir_inode_operations; | |
118 | inode->i_fop = &ubifs_dir_operations; | |
119 | inode->i_size = ui->ui_size = UBIFS_INO_NODE_SZ; | |
120 | break; | |
121 | case S_IFLNK: | |
122 | inode->i_op = &ubifs_symlink_inode_operations; | |
123 | break; | |
124 | case S_IFSOCK: | |
125 | case S_IFIFO: | |
126 | case S_IFBLK: | |
127 | case S_IFCHR: | |
128 | inode->i_op = &ubifs_file_inode_operations; | |
129 | break; | |
130 | default: | |
131 | BUG(); | |
132 | } | |
133 | ||
134 | ui->flags = inherit_flags(dir, mode); | |
135 | ubifs_set_inode_flags(inode); | |
136 | if (S_ISREG(mode)) | |
137 | ui->compr_type = c->default_compr; | |
138 | else | |
139 | ui->compr_type = UBIFS_COMPR_NONE; | |
140 | ui->synced_i_size = 0; | |
141 | ||
142 | spin_lock(&c->cnt_lock); | |
143 | /* Inode number overflow is currently not supported */ | |
144 | if (c->highest_inum >= INUM_WARN_WATERMARK) { | |
145 | if (c->highest_inum >= INUM_WATERMARK) { | |
146 | spin_unlock(&c->cnt_lock); | |
235c362b | 147 | ubifs_err(c, "out of inode numbers"); |
4c030fa8 EB |
148 | err = -EINVAL; |
149 | goto out_iput; | |
1e51764a | 150 | } |
1a7e985d | 151 | ubifs_warn(c, "running out of inode numbers (current %lu, max %u)", |
e84461ad | 152 | (unsigned long)c->highest_inum, INUM_WATERMARK); |
1e51764a AB |
153 | } |
154 | ||
155 | inode->i_ino = ++c->highest_inum; | |
1e51764a AB |
156 | /* |
157 | * The creation sequence number remains with this inode for its | |
158 | * lifetime. All nodes for this inode have a greater sequence number, | |
159 | * and so it is possible to distinguish obsolete nodes belonging to a | |
160 | * previous incarnation of the same inode number - for example, for the | |
161 | * purpose of rebuilding the index. | |
162 | */ | |
163 | ui->creat_sqnum = ++c->max_sqnum; | |
164 | spin_unlock(&c->cnt_lock); | |
d475a507 RW |
165 | |
166 | if (encrypted) { | |
4c030fa8 | 167 | err = fscrypt_set_context(inode, NULL); |
d475a507 | 168 | if (err) { |
4c030fa8 EB |
169 | ubifs_err(c, "fscrypt_set_context failed: %i", err); |
170 | goto out_iput; | |
d475a507 RW |
171 | } |
172 | } | |
173 | ||
1e51764a | 174 | return inode; |
4c030fa8 EB |
175 | |
176 | out_iput: | |
177 | make_bad_inode(inode); | |
178 | iput(inode); | |
179 | return ERR_PTR(err); | |
1e51764a AB |
180 | } |
181 | ||
bb2615d4 AB |
182 | static int dbg_check_name(const struct ubifs_info *c, |
183 | const struct ubifs_dent_node *dent, | |
f4f61d2c | 184 | const struct fscrypt_name *nm) |
1e51764a | 185 | { |
2b1844a8 | 186 | if (!dbg_is_chk_gen(c)) |
1e51764a | 187 | return 0; |
f4f61d2c | 188 | if (le16_to_cpu(dent->nlen) != fname_len(nm)) |
1e51764a | 189 | return -EINVAL; |
f4f61d2c | 190 | if (memcmp(dent->name, fname_name(nm), fname_len(nm))) |
1e51764a AB |
191 | return -EINVAL; |
192 | return 0; | |
193 | } | |
194 | ||
1e51764a | 195 | static struct dentry *ubifs_lookup(struct inode *dir, struct dentry *dentry, |
00cd8dd3 | 196 | unsigned int flags) |
1e51764a AB |
197 | { |
198 | int err; | |
199 | union ubifs_key key; | |
200 | struct inode *inode = NULL; | |
191ac107 | 201 | struct ubifs_dent_node *dent = NULL; |
1e51764a | 202 | struct ubifs_info *c = dir->i_sb->s_fs_info; |
f4f61d2c | 203 | struct fscrypt_name nm; |
1e51764a | 204 | |
4cb2a01d | 205 | dbg_gen("'%pd' in dir ino %lu", dentry, dir->i_ino); |
1e51764a | 206 | |
b01531db | 207 | err = fscrypt_prepare_lookup(dir, dentry, &nm); |
bb9cd910 | 208 | generic_set_encrypted_ci_d_ops(dentry); |
b01531db EB |
209 | if (err == -ENOENT) |
210 | return d_splice_alias(NULL, dentry); | |
f4f61d2c RW |
211 | if (err) |
212 | return ERR_PTR(err); | |
213 | ||
214 | if (fname_len(&nm) > UBIFS_MAX_NLEN) { | |
191ac107 AV |
215 | inode = ERR_PTR(-ENAMETOOLONG); |
216 | goto done; | |
f4f61d2c | 217 | } |
1e51764a AB |
218 | |
219 | dent = kmalloc(UBIFS_MAX_DENT_NODE_SZ, GFP_NOFS); | |
f4f61d2c | 220 | if (!dent) { |
191ac107 AV |
221 | inode = ERR_PTR(-ENOMEM); |
222 | goto done; | |
f4f61d2c | 223 | } |
1e51764a | 224 | |
aec992aa | 225 | if (fname_name(&nm) == NULL) { |
f0d07a98 EB |
226 | if (nm.hash & ~UBIFS_S_KEY_HASH_MASK) |
227 | goto done; /* ENOENT */ | |
f4f61d2c | 228 | dent_key_init_hash(c, &key, dir->i_ino, nm.hash); |
528e3d17 | 229 | err = ubifs_tnc_lookup_dh(c, &key, dent, nm.minor_hash); |
f4f61d2c RW |
230 | } else { |
231 | dent_key_init(c, &key, dir->i_ino, &nm); | |
232 | err = ubifs_tnc_lookup_nm(c, &key, dent, &nm); | |
233 | } | |
1e51764a | 234 | |
1e51764a | 235 | if (err) { |
191ac107 | 236 | if (err == -ENOENT) |
1e51764a | 237 | dbg_gen("not found"); |
191ac107 AV |
238 | else |
239 | inode = ERR_PTR(err); | |
240 | goto done; | |
1e51764a AB |
241 | } |
242 | ||
f4f61d2c | 243 | if (dbg_check_name(c, dent, &nm)) { |
191ac107 AV |
244 | inode = ERR_PTR(-EINVAL); |
245 | goto done; | |
1e51764a AB |
246 | } |
247 | ||
248 | inode = ubifs_iget(dir->i_sb, le64_to_cpu(dent->inum)); | |
249 | if (IS_ERR(inode)) { | |
250 | /* | |
251 | * This should not happen. Probably the file-system needs | |
252 | * checking. | |
253 | */ | |
254 | err = PTR_ERR(inode); | |
235c362b | 255 | ubifs_err(c, "dead directory entry '%pd', error %d", |
4cb2a01d | 256 | dentry, err); |
1e51764a | 257 | ubifs_ro_mode(c, err); |
191ac107 | 258 | goto done; |
1e51764a AB |
259 | } |
260 | ||
50d9fad7 | 261 | if (IS_ENCRYPTED(dir) && |
413d5a9e EB |
262 | (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) && |
263 | !fscrypt_has_permitted_context(dir, inode)) { | |
264 | ubifs_warn(c, "Inconsistent encryption contexts: %lu/%lu", | |
265 | dir->i_ino, inode->i_ino); | |
191ac107 AV |
266 | iput(inode); |
267 | inode = ERR_PTR(-EPERM); | |
413d5a9e EB |
268 | } |
269 | ||
1e51764a AB |
270 | done: |
271 | kfree(dent); | |
f4f61d2c | 272 | fscrypt_free_filename(&nm); |
191ac107 | 273 | return d_splice_alias(inode, dentry); |
1e51764a AB |
274 | } |
275 | ||
76786a0f EB |
276 | static int ubifs_prepare_create(struct inode *dir, struct dentry *dentry, |
277 | struct fscrypt_name *nm) | |
278 | { | |
279 | if (fscrypt_is_nokey_name(dentry)) | |
280 | return -ENOKEY; | |
281 | ||
282 | return fscrypt_setup_filename(dir, &dentry->d_name, 0, nm); | |
283 | } | |
284 | ||
6c960e68 | 285 | static int ubifs_create(struct mnt_idmap *idmap, struct inode *dir, |
549c7297 | 286 | struct dentry *dentry, umode_t mode, bool excl) |
1e51764a AB |
287 | { |
288 | struct inode *inode; | |
289 | struct ubifs_info *c = dir->i_sb->s_fs_info; | |
1e51764a AB |
290 | struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1, |
291 | .dirtied_ino = 1 }; | |
292 | struct ubifs_inode *dir_ui = ubifs_inode(dir); | |
f4f61d2c RW |
293 | struct fscrypt_name nm; |
294 | int err, sz_change; | |
1e51764a AB |
295 | |
296 | /* | |
297 | * Budget request settings: new inode, new direntry, changing the | |
298 | * parent directory inode. | |
299 | */ | |
300 | ||
4cb2a01d AV |
301 | dbg_gen("dent '%pd', mode %#hx in dir ino %lu", |
302 | dentry, mode, dir->i_ino); | |
1e51764a AB |
303 | |
304 | err = ubifs_budget_space(c, &req); | |
305 | if (err) | |
306 | return err; | |
307 | ||
76786a0f | 308 | err = ubifs_prepare_create(dir, dentry, &nm); |
f4f61d2c RW |
309 | if (err) |
310 | goto out_budg; | |
311 | ||
312 | sz_change = CALC_DENT_SIZE(fname_len(&nm)); | |
313 | ||
a0c51565 | 314 | inode = ubifs_new_inode(c, dir, mode, false); |
1e51764a AB |
315 | if (IS_ERR(inode)) { |
316 | err = PTR_ERR(inode); | |
f4f61d2c | 317 | goto out_fname; |
1e51764a AB |
318 | } |
319 | ||
d7f0b70d SN |
320 | err = ubifs_init_security(dir, inode, &dentry->d_name); |
321 | if (err) | |
9401a795 | 322 | goto out_inode; |
d7f0b70d | 323 | |
1e51764a AB |
324 | mutex_lock(&dir_ui->ui_mutex); |
325 | dir->i_size += sz_change; | |
326 | dir_ui->ui_size = dir->i_size; | |
e4cfef33 JL |
327 | inode_set_mtime_to_ts(dir, |
328 | inode_set_ctime_to_ts(dir, inode_get_ctime(inode))); | |
f4f61d2c | 329 | err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0); |
1e51764a AB |
330 | if (err) |
331 | goto out_cancel; | |
332 | mutex_unlock(&dir_ui->ui_mutex); | |
333 | ||
334 | ubifs_release_budget(c, &req); | |
f4f61d2c | 335 | fscrypt_free_filename(&nm); |
1e51764a AB |
336 | insert_inode_hash(inode); |
337 | d_instantiate(dentry, inode); | |
338 | return 0; | |
339 | ||
340 | out_cancel: | |
341 | dir->i_size -= sz_change; | |
342 | dir_ui->ui_size = dir->i_size; | |
343 | mutex_unlock(&dir_ui->ui_mutex); | |
9401a795 | 344 | out_inode: |
1e51764a AB |
345 | make_bad_inode(inode); |
346 | iput(inode); | |
f4f61d2c RW |
347 | out_fname: |
348 | fscrypt_free_filename(&nm); | |
1e51764a AB |
349 | out_budg: |
350 | ubifs_release_budget(c, &req); | |
235c362b | 351 | ubifs_err(c, "cannot create regular file, error %d", err); |
1e51764a AB |
352 | return err; |
353 | } | |
354 | ||
278d9a24 ZC |
355 | static struct inode *create_whiteout(struct inode *dir, struct dentry *dentry) |
356 | { | |
357 | int err; | |
358 | umode_t mode = S_IFCHR | WHITEOUT_MODE; | |
359 | struct inode *inode; | |
360 | struct ubifs_info *c = dir->i_sb->s_fs_info; | |
278d9a24 ZC |
361 | |
362 | /* | |
363 | * Create an inode('nlink = 1') for whiteout without updating journal, | |
364 | * let ubifs_jnl_rename() store it on flash to complete rename whiteout | |
365 | * atomically. | |
366 | */ | |
367 | ||
368 | dbg_gen("dent '%pd', mode %#hx in dir ino %lu", | |
369 | dentry, mode, dir->i_ino); | |
370 | ||
a0c51565 | 371 | inode = ubifs_new_inode(c, dir, mode, false); |
278d9a24 ZC |
372 | if (IS_ERR(inode)) { |
373 | err = PTR_ERR(inode); | |
374 | goto out_free; | |
375 | } | |
376 | ||
377 | init_special_inode(inode, inode->i_mode, WHITEOUT_DEV); | |
378 | ubifs_assert(c, inode->i_op == &ubifs_file_inode_operations); | |
379 | ||
380 | err = ubifs_init_security(dir, inode, &dentry->d_name); | |
381 | if (err) | |
382 | goto out_inode; | |
383 | ||
384 | /* The dir size is updated by do_rename. */ | |
385 | insert_inode_hash(inode); | |
386 | ||
387 | return inode; | |
388 | ||
389 | out_inode: | |
390 | make_bad_inode(inode); | |
391 | iput(inode); | |
392 | out_free: | |
278d9a24 ZC |
393 | ubifs_err(c, "cannot create whiteout file, error %d", err); |
394 | return ERR_PTR(err); | |
395 | } | |
396 | ||
60eb3b9c ZC |
397 | /** |
398 | * lock_2_inodes - a wrapper for locking two UBIFS inodes. | |
399 | * @inode1: first inode | |
400 | * @inode2: second inode | |
401 | * | |
402 | * We do not implement any tricks to guarantee strict lock ordering, because | |
403 | * VFS has already done it for us on the @i_mutex. So this is just a simple | |
404 | * wrapper function. | |
405 | */ | |
406 | static void lock_2_inodes(struct inode *inode1, struct inode *inode2) | |
407 | { | |
408 | mutex_lock_nested(&ubifs_inode(inode1)->ui_mutex, WB_MUTEX_1); | |
409 | mutex_lock_nested(&ubifs_inode(inode2)->ui_mutex, WB_MUTEX_2); | |
410 | } | |
411 | ||
412 | /** | |
413 | * unlock_2_inodes - a wrapper for unlocking two UBIFS inodes. | |
414 | * @inode1: first inode | |
415 | * @inode2: second inode | |
416 | */ | |
417 | static void unlock_2_inodes(struct inode *inode1, struct inode *inode2) | |
418 | { | |
419 | mutex_unlock(&ubifs_inode(inode2)->ui_mutex); | |
420 | mutex_unlock(&ubifs_inode(inode1)->ui_mutex); | |
421 | } | |
422 | ||
011e2b71 | 423 | static int ubifs_tmpfile(struct mnt_idmap *idmap, struct inode *dir, |
863f144f | 424 | struct file *file, umode_t mode) |
474b9370 | 425 | { |
863f144f | 426 | struct dentry *dentry = file->f_path.dentry; |
474b9370 RW |
427 | struct inode *inode; |
428 | struct ubifs_info *c = dir->i_sb->s_fs_info; | |
a6dab660 ZC |
429 | struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1, |
430 | .dirtied_ino = 1}; | |
474b9370 | 431 | struct ubifs_budget_req ino_req = { .dirtied_ino = 1 }; |
60eb3b9c | 432 | struct ubifs_inode *ui; |
474b9370 | 433 | int err, instantiated = 0; |
f4f61d2c | 434 | struct fscrypt_name nm; |
474b9370 RW |
435 | |
436 | /* | |
a6dab660 ZC |
437 | * Budget request settings: new inode, new direntry, changing the |
438 | * parent directory inode. | |
439 | * Allocate budget separately for new dirtied inode, the budget will | |
440 | * be released via writeback. | |
474b9370 RW |
441 | */ |
442 | ||
443 | dbg_gen("dent '%pd', mode %#hx in dir ino %lu", | |
444 | dentry, mode, dir->i_ino); | |
445 | ||
f4f61d2c | 446 | err = fscrypt_setup_filename(dir, &dentry->d_name, 0, &nm); |
474b9370 RW |
447 | if (err) |
448 | return err; | |
449 | ||
f4f61d2c RW |
450 | err = ubifs_budget_space(c, &req); |
451 | if (err) { | |
452 | fscrypt_free_filename(&nm); | |
453 | return err; | |
454 | } | |
455 | ||
474b9370 RW |
456 | err = ubifs_budget_space(c, &ino_req); |
457 | if (err) { | |
458 | ubifs_release_budget(c, &req); | |
f4f61d2c | 459 | fscrypt_free_filename(&nm); |
474b9370 RW |
460 | return err; |
461 | } | |
462 | ||
a0c51565 | 463 | inode = ubifs_new_inode(c, dir, mode, false); |
474b9370 RW |
464 | if (IS_ERR(inode)) { |
465 | err = PTR_ERR(inode); | |
466 | goto out_budg; | |
467 | } | |
468 | ui = ubifs_inode(inode); | |
469 | ||
470 | err = ubifs_init_security(dir, inode, &dentry->d_name); | |
471 | if (err) | |
472 | goto out_inode; | |
473 | ||
474 | mutex_lock(&ui->ui_mutex); | |
475 | insert_inode_hash(inode); | |
863f144f | 476 | d_tmpfile(file, inode); |
6eb61d58 | 477 | ubifs_assert(c, ui->dirty); |
9e0a1fff | 478 | |
474b9370 RW |
479 | instantiated = 1; |
480 | mutex_unlock(&ui->ui_mutex); | |
481 | ||
60eb3b9c | 482 | lock_2_inodes(dir, inode); |
f4f61d2c | 483 | err = ubifs_jnl_update(c, dir, &nm, inode, 1, 0); |
474b9370 RW |
484 | if (err) |
485 | goto out_cancel; | |
60eb3b9c | 486 | unlock_2_inodes(dir, inode); |
474b9370 RW |
487 | |
488 | ubifs_release_budget(c, &req); | |
1fb815b3 | 489 | fscrypt_free_filename(&nm); |
474b9370 | 490 | |
863f144f | 491 | return finish_open_simple(file, 0); |
474b9370 RW |
492 | |
493 | out_cancel: | |
60eb3b9c | 494 | unlock_2_inodes(dir, inode); |
474b9370 RW |
495 | out_inode: |
496 | make_bad_inode(inode); | |
497 | if (!instantiated) | |
498 | iput(inode); | |
499 | out_budg: | |
500 | ubifs_release_budget(c, &req); | |
501 | if (!instantiated) | |
502 | ubifs_release_budget(c, &ino_req); | |
f4f61d2c | 503 | fscrypt_free_filename(&nm); |
474b9370 RW |
504 | ubifs_err(c, "cannot create temporary file, error %d", err); |
505 | return err; | |
506 | } | |
507 | ||
1e51764a AB |
508 | /** |
509 | * vfs_dent_type - get VFS directory entry type. | |
510 | * @type: UBIFS directory entry type | |
511 | * | |
512 | * This function converts UBIFS directory entry type into VFS directory entry | |
513 | * type. | |
514 | */ | |
515 | static unsigned int vfs_dent_type(uint8_t type) | |
516 | { | |
517 | switch (type) { | |
518 | case UBIFS_ITYPE_REG: | |
519 | return DT_REG; | |
520 | case UBIFS_ITYPE_DIR: | |
521 | return DT_DIR; | |
522 | case UBIFS_ITYPE_LNK: | |
523 | return DT_LNK; | |
524 | case UBIFS_ITYPE_BLK: | |
525 | return DT_BLK; | |
526 | case UBIFS_ITYPE_CHR: | |
527 | return DT_CHR; | |
528 | case UBIFS_ITYPE_FIFO: | |
529 | return DT_FIFO; | |
530 | case UBIFS_ITYPE_SOCK: | |
531 | return DT_SOCK; | |
532 | default: | |
533 | BUG(); | |
534 | } | |
535 | return 0; | |
536 | } | |
537 | ||
538 | /* | |
539 | * The classical Unix view for directory is that it is a linear array of | |
540 | * (name, inode number) entries. Linux/VFS assumes this model as well. | |
541 | * Particularly, 'readdir()' call wants us to return a directory entry offset | |
542 | * which later may be used to continue 'readdir()'ing the directory or to | |
543 | * 'seek()' to that specific direntry. Obviously UBIFS does not really fit this | |
544 | * model because directory entries are identified by keys, which may collide. | |
545 | * | |
546 | * UBIFS uses directory entry hash value for directory offsets, so | |
547 | * 'seekdir()'/'telldir()' may not always work because of possible key | |
548 | * collisions. But UBIFS guarantees that consecutive 'readdir()' calls work | |
549 | * properly by means of saving full directory entry name in the private field | |
550 | * of the file description object. | |
551 | * | |
552 | * This means that UBIFS cannot support NFS which requires full | |
553 | * 'seekdir()'/'telldir()' support. | |
554 | */ | |
01122e06 | 555 | static int ubifs_readdir(struct file *file, struct dir_context *ctx) |
1e51764a | 556 | { |
ba75d570 | 557 | int fstr_real_len = 0, err = 0; |
f4f61d2c RW |
558 | struct fscrypt_name nm; |
559 | struct fscrypt_str fstr = {0}; | |
1e51764a AB |
560 | union ubifs_key key; |
561 | struct ubifs_dent_node *dent; | |
496ad9aa | 562 | struct inode *dir = file_inode(file); |
1e51764a | 563 | struct ubifs_info *c = dir->i_sb->s_fs_info; |
50d9fad7 | 564 | bool encrypted = IS_ENCRYPTED(dir); |
1e51764a | 565 | |
01122e06 | 566 | dbg_gen("dir ino %lu, f_pos %#llx", dir->i_ino, ctx->pos); |
1e51764a | 567 | |
01122e06 | 568 | if (ctx->pos > UBIFS_S_KEY_HASH_MASK || ctx->pos == 2) |
1e51764a AB |
569 | /* |
570 | * The directory was seek'ed to a senseless position or there | |
571 | * are no more entries. | |
572 | */ | |
573 | return 0; | |
574 | ||
f4f61d2c | 575 | if (encrypted) { |
ec0caa97 | 576 | err = fscrypt_prepare_readdir(dir); |
3b1ada55 | 577 | if (err) |
f4f61d2c RW |
578 | return err; |
579 | ||
8b10fe68 | 580 | err = fscrypt_fname_alloc_buffer(UBIFS_MAX_NLEN, &fstr); |
f4f61d2c RW |
581 | if (err) |
582 | return err; | |
583 | ||
584 | fstr_real_len = fstr.len; | |
585 | } | |
586 | ||
605c912b AB |
587 | if (file->f_version == 0) { |
588 | /* | |
589 | * The file was seek'ed, which means that @file->private_data | |
590 | * is now invalid. This may also be just the first | |
591 | * 'ubifs_readdir()' invocation, in which case | |
592 | * @file->private_data is NULL, and the below code is | |
593 | * basically a no-op. | |
594 | */ | |
595 | kfree(file->private_data); | |
596 | file->private_data = NULL; | |
597 | } | |
598 | ||
599 | /* | |
600 | * 'generic_file_llseek()' unconditionally sets @file->f_version to | |
601 | * zero, and we use this for detecting whether the file was seek'ed. | |
602 | */ | |
603 | file->f_version = 1; | |
604 | ||
1e51764a | 605 | /* File positions 0 and 1 correspond to "." and ".." */ |
01122e06 | 606 | if (ctx->pos < 2) { |
6eb61d58 | 607 | ubifs_assert(c, !file->private_data); |
f4f61d2c RW |
608 | if (!dir_emit_dots(file, ctx)) { |
609 | if (encrypted) | |
610 | fscrypt_fname_free_buffer(&fstr); | |
1e51764a | 611 | return 0; |
f4f61d2c | 612 | } |
1e51764a AB |
613 | |
614 | /* Find the first entry in TNC and save it */ | |
615 | lowest_dent_key(c, &key, dir->i_ino); | |
f4f61d2c | 616 | fname_len(&nm) = 0; |
1e51764a AB |
617 | dent = ubifs_tnc_next_ent(c, &key, &nm); |
618 | if (IS_ERR(dent)) { | |
619 | err = PTR_ERR(dent); | |
620 | goto out; | |
621 | } | |
622 | ||
01122e06 | 623 | ctx->pos = key_hash_flash(c, &dent->key); |
1e51764a AB |
624 | file->private_data = dent; |
625 | } | |
626 | ||
627 | dent = file->private_data; | |
628 | if (!dent) { | |
629 | /* | |
630 | * The directory was seek'ed to and is now readdir'ed. | |
01122e06 | 631 | * Find the entry corresponding to @ctx->pos or the closest one. |
1e51764a | 632 | */ |
01122e06 | 633 | dent_key_init_hash(c, &key, dir->i_ino, ctx->pos); |
f4f61d2c | 634 | fname_len(&nm) = 0; |
1e51764a AB |
635 | dent = ubifs_tnc_next_ent(c, &key, &nm); |
636 | if (IS_ERR(dent)) { | |
637 | err = PTR_ERR(dent); | |
638 | goto out; | |
639 | } | |
01122e06 | 640 | ctx->pos = key_hash_flash(c, &dent->key); |
1e51764a AB |
641 | file->private_data = dent; |
642 | } | |
643 | ||
644 | while (1) { | |
b20e2d99 HL |
645 | dbg_gen("ino %llu, new f_pos %#x", |
646 | (unsigned long long)le64_to_cpu(dent->inum), | |
1e51764a | 647 | key_hash_flash(c, &dent->key)); |
6eb61d58 | 648 | ubifs_assert(c, le64_to_cpu(dent->ch.sqnum) > |
0ecb9529 | 649 | ubifs_inode(dir)->creat_sqnum); |
1e51764a | 650 | |
f4f61d2c RW |
651 | fname_len(&nm) = le16_to_cpu(dent->nlen); |
652 | fname_name(&nm) = dent->name; | |
653 | ||
654 | if (encrypted) { | |
655 | fstr.len = fstr_real_len; | |
656 | ||
528e3d17 RW |
657 | err = fscrypt_fname_disk_to_usr(dir, key_hash_flash(c, |
658 | &dent->key), | |
659 | le32_to_cpu(dent->cookie), | |
660 | &nm.disk_name, &fstr); | |
ca7f85be | 661 | if (err) |
f4f61d2c RW |
662 | goto out; |
663 | } else { | |
664 | fstr.len = fname_len(&nm); | |
665 | fstr.name = fname_name(&nm); | |
666 | } | |
667 | ||
668 | if (!dir_emit(ctx, fstr.name, fstr.len, | |
1e51764a | 669 | le64_to_cpu(dent->inum), |
f4f61d2c RW |
670 | vfs_dent_type(dent->type))) { |
671 | if (encrypted) | |
672 | fscrypt_fname_free_buffer(&fstr); | |
1e51764a | 673 | return 0; |
f4f61d2c | 674 | } |
1e51764a AB |
675 | |
676 | /* Switch to the next entry */ | |
677 | key_read(c, &dent->key, &key); | |
1e51764a AB |
678 | dent = ubifs_tnc_next_ent(c, &key, &nm); |
679 | if (IS_ERR(dent)) { | |
680 | err = PTR_ERR(dent); | |
681 | goto out; | |
682 | } | |
683 | ||
684 | kfree(file->private_data); | |
01122e06 | 685 | ctx->pos = key_hash_flash(c, &dent->key); |
1e51764a AB |
686 | file->private_data = dent; |
687 | cond_resched(); | |
688 | } | |
689 | ||
690 | out: | |
aeeb14f7 RW |
691 | kfree(file->private_data); |
692 | file->private_data = NULL; | |
693 | ||
f4f61d2c RW |
694 | if (encrypted) |
695 | fscrypt_fname_free_buffer(&fstr); | |
696 | ||
c83ed4c9 | 697 | if (err != -ENOENT) |
235c362b | 698 | ubifs_err(c, "cannot find next direntry, error %d", err); |
a00052a2 RW |
699 | else |
700 | /* | |
701 | * -ENOENT is a non-fatal error in this context, the TNC uses | |
702 | * it to indicate that the cursor moved past the current directory | |
703 | * and readdir() has to stop. | |
704 | */ | |
705 | err = 0; | |
706 | ||
1e51764a | 707 | |
605c912b | 708 | /* 2 is a special value indicating that there are no more direntries */ |
01122e06 | 709 | ctx->pos = 2; |
c83ed4c9 | 710 | return err; |
1e51764a AB |
711 | } |
712 | ||
1e51764a AB |
713 | /* Free saved readdir() state when the directory is closed */ |
714 | static int ubifs_dir_release(struct inode *dir, struct file *file) | |
715 | { | |
716 | kfree(file->private_data); | |
717 | file->private_data = NULL; | |
718 | return 0; | |
719 | } | |
720 | ||
1e51764a AB |
721 | static int ubifs_link(struct dentry *old_dentry, struct inode *dir, |
722 | struct dentry *dentry) | |
723 | { | |
724 | struct ubifs_info *c = dir->i_sb->s_fs_info; | |
2b0143b5 | 725 | struct inode *inode = d_inode(old_dentry); |
1e51764a AB |
726 | struct ubifs_inode *ui = ubifs_inode(inode); |
727 | struct ubifs_inode *dir_ui = ubifs_inode(dir); | |
728 | int err, sz_change = CALC_DENT_SIZE(dentry->d_name.len); | |
729 | struct ubifs_budget_req req = { .new_dent = 1, .dirtied_ino = 2, | |
dab4b4d2 | 730 | .dirtied_ino_d = ALIGN(ui->data_len, 8) }; |
f4f61d2c | 731 | struct fscrypt_name nm; |
1e51764a AB |
732 | |
733 | /* | |
734 | * Budget request settings: new direntry, changing the target inode, | |
735 | * changing the parent inode. | |
736 | */ | |
737 | ||
4cb2a01d AV |
738 | dbg_gen("dent '%pd' to ino %lu (nlink %d) in dir ino %lu", |
739 | dentry, inode->i_ino, | |
1e51764a | 740 | inode->i_nlink, dir->i_ino); |
6eb61d58 RW |
741 | ubifs_assert(c, inode_is_locked(dir)); |
742 | ubifs_assert(c, inode_is_locked(inode)); | |
8b3884a8 | 743 | |
5653878c EB |
744 | err = fscrypt_prepare_link(old_dentry, dir, dentry); |
745 | if (err) | |
746 | return err; | |
f4f61d2c RW |
747 | |
748 | err = fscrypt_setup_filename(dir, &dentry->d_name, 0, &nm); | |
1e51764a AB |
749 | if (err) |
750 | return err; | |
751 | ||
f4f61d2c RW |
752 | err = dbg_check_synced_i_size(c, inode); |
753 | if (err) | |
754 | goto out_fname; | |
755 | ||
1e51764a AB |
756 | err = ubifs_budget_space(c, &req); |
757 | if (err) | |
f4f61d2c | 758 | goto out_fname; |
1e51764a AB |
759 | |
760 | lock_2_inodes(dir, inode); | |
32fe905c RW |
761 | |
762 | /* Handle O_TMPFILE corner case, it is allowed to link a O_TMPFILE. */ | |
763 | if (inode->i_nlink == 0) | |
764 | ubifs_delete_orphan(c, inode->i_ino); | |
765 | ||
1e51764a | 766 | inc_nlink(inode); |
7de9c6ee | 767 | ihold(inode); |
d07d3a7e | 768 | inode_set_ctime_current(inode); |
1e51764a AB |
769 | dir->i_size += sz_change; |
770 | dir_ui->ui_size = dir->i_size; | |
e4cfef33 JL |
771 | inode_set_mtime_to_ts(dir, |
772 | inode_set_ctime_to_ts(dir, inode_get_ctime(inode))); | |
f4f61d2c | 773 | err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0); |
1e51764a AB |
774 | if (err) |
775 | goto out_cancel; | |
776 | unlock_2_inodes(dir, inode); | |
777 | ||
778 | ubifs_release_budget(c, &req); | |
779 | d_instantiate(dentry, inode); | |
f4f61d2c | 780 | fscrypt_free_filename(&nm); |
1e51764a AB |
781 | return 0; |
782 | ||
783 | out_cancel: | |
784 | dir->i_size -= sz_change; | |
785 | dir_ui->ui_size = dir->i_size; | |
786 | drop_nlink(inode); | |
32fe905c RW |
787 | if (inode->i_nlink == 0) |
788 | ubifs_add_orphan(c, inode->i_ino); | |
1e51764a AB |
789 | unlock_2_inodes(dir, inode); |
790 | ubifs_release_budget(c, &req); | |
791 | iput(inode); | |
f4f61d2c RW |
792 | out_fname: |
793 | fscrypt_free_filename(&nm); | |
1e51764a AB |
794 | return err; |
795 | } | |
796 | ||
797 | static int ubifs_unlink(struct inode *dir, struct dentry *dentry) | |
798 | { | |
799 | struct ubifs_info *c = dir->i_sb->s_fs_info; | |
2b0143b5 | 800 | struct inode *inode = d_inode(dentry); |
1e51764a | 801 | struct ubifs_inode *dir_ui = ubifs_inode(dir); |
f4f61d2c | 802 | int err, sz_change, budgeted = 1; |
1e51764a | 803 | struct ubifs_budget_req req = { .mod_dent = 1, .dirtied_ino = 2 }; |
c43be108 | 804 | unsigned int saved_nlink = inode->i_nlink; |
f4f61d2c | 805 | struct fscrypt_name nm; |
1e51764a AB |
806 | |
807 | /* | |
808 | * Budget request settings: deletion direntry, deletion inode (+1 for | |
809 | * @dirtied_ino), changing the parent directory inode. If budgeting | |
810 | * fails, go ahead anyway because we have extra space reserved for | |
811 | * deletions. | |
812 | */ | |
813 | ||
4cb2a01d AV |
814 | dbg_gen("dent '%pd' from ino %lu (nlink %d) in dir ino %lu", |
815 | dentry, inode->i_ino, | |
1e51764a | 816 | inode->i_nlink, dir->i_ino); |
f4f61d2c | 817 | |
f4f61d2c RW |
818 | err = fscrypt_setup_filename(dir, &dentry->d_name, 1, &nm); |
819 | if (err) | |
820 | return err; | |
821 | ||
9ca2d732 RW |
822 | err = ubifs_purge_xattrs(inode); |
823 | if (err) | |
824 | return err; | |
825 | ||
f4f61d2c RW |
826 | sz_change = CALC_DENT_SIZE(fname_len(&nm)); |
827 | ||
6eb61d58 RW |
828 | ubifs_assert(c, inode_is_locked(dir)); |
829 | ubifs_assert(c, inode_is_locked(inode)); | |
d808efb4 | 830 | err = dbg_check_synced_i_size(c, inode); |
1e51764a | 831 | if (err) |
f4f61d2c | 832 | goto out_fname; |
1e51764a AB |
833 | |
834 | err = ubifs_budget_space(c, &req); | |
835 | if (err) { | |
836 | if (err != -ENOSPC) | |
f4f61d2c | 837 | goto out_fname; |
1e51764a AB |
838 | budgeted = 0; |
839 | } | |
840 | ||
841 | lock_2_inodes(dir, inode); | |
d07d3a7e | 842 | inode_set_ctime_current(inode); |
1e51764a AB |
843 | drop_nlink(inode); |
844 | dir->i_size -= sz_change; | |
845 | dir_ui->ui_size = dir->i_size; | |
e4cfef33 JL |
846 | inode_set_mtime_to_ts(dir, |
847 | inode_set_ctime_to_ts(dir, inode_get_ctime(inode))); | |
f4f61d2c | 848 | err = ubifs_jnl_update(c, dir, &nm, inode, 1, 0); |
1e51764a AB |
849 | if (err) |
850 | goto out_cancel; | |
851 | unlock_2_inodes(dir, inode); | |
852 | ||
853 | if (budgeted) | |
854 | ubifs_release_budget(c, &req); | |
855 | else { | |
856 | /* We've deleted something - clean the "no space" flags */ | |
b137545c | 857 | c->bi.nospace = c->bi.nospace_rp = 0; |
1e51764a AB |
858 | smp_wmb(); |
859 | } | |
f4f61d2c | 860 | fscrypt_free_filename(&nm); |
1e51764a AB |
861 | return 0; |
862 | ||
863 | out_cancel: | |
864 | dir->i_size += sz_change; | |
865 | dir_ui->ui_size = dir->i_size; | |
c43be108 | 866 | set_nlink(inode, saved_nlink); |
1e51764a AB |
867 | unlock_2_inodes(dir, inode); |
868 | if (budgeted) | |
869 | ubifs_release_budget(c, &req); | |
f4f61d2c RW |
870 | out_fname: |
871 | fscrypt_free_filename(&nm); | |
1e51764a AB |
872 | return err; |
873 | } | |
874 | ||
875 | /** | |
27ef523a | 876 | * ubifs_check_dir_empty - check if a directory is empty or not. |
1e51764a AB |
877 | * @dir: VFS inode object of the directory to check |
878 | * | |
879 | * This function checks if directory @dir is empty. Returns zero if the | |
880 | * directory is empty, %-ENOTEMPTY if it is not, and other negative error codes | |
b8f1da98 | 881 | * in case of errors. |
1e51764a | 882 | */ |
f6337d84 | 883 | int ubifs_check_dir_empty(struct inode *dir) |
1e51764a | 884 | { |
f6337d84 | 885 | struct ubifs_info *c = dir->i_sb->s_fs_info; |
f4f61d2c | 886 | struct fscrypt_name nm = { 0 }; |
1e51764a AB |
887 | struct ubifs_dent_node *dent; |
888 | union ubifs_key key; | |
889 | int err; | |
890 | ||
891 | lowest_dent_key(c, &key, dir->i_ino); | |
892 | dent = ubifs_tnc_next_ent(c, &key, &nm); | |
893 | if (IS_ERR(dent)) { | |
894 | err = PTR_ERR(dent); | |
895 | if (err == -ENOENT) | |
896 | err = 0; | |
897 | } else { | |
898 | kfree(dent); | |
899 | err = -ENOTEMPTY; | |
900 | } | |
901 | return err; | |
902 | } | |
903 | ||
904 | static int ubifs_rmdir(struct inode *dir, struct dentry *dentry) | |
905 | { | |
906 | struct ubifs_info *c = dir->i_sb->s_fs_info; | |
2b0143b5 | 907 | struct inode *inode = d_inode(dentry); |
f4f61d2c | 908 | int err, sz_change, budgeted = 1; |
1e51764a AB |
909 | struct ubifs_inode *dir_ui = ubifs_inode(dir); |
910 | struct ubifs_budget_req req = { .mod_dent = 1, .dirtied_ino = 2 }; | |
f4f61d2c | 911 | struct fscrypt_name nm; |
1e51764a AB |
912 | |
913 | /* | |
914 | * Budget request settings: deletion direntry, deletion inode and | |
915 | * changing the parent inode. If budgeting fails, go ahead anyway | |
916 | * because we have extra space reserved for deletions. | |
917 | */ | |
918 | ||
4cb2a01d AV |
919 | dbg_gen("directory '%pd', ino %lu in dir ino %lu", dentry, |
920 | inode->i_ino, dir->i_ino); | |
6eb61d58 RW |
921 | ubifs_assert(c, inode_is_locked(dir)); |
922 | ubifs_assert(c, inode_is_locked(inode)); | |
f6337d84 | 923 | err = ubifs_check_dir_empty(d_inode(dentry)); |
1e51764a AB |
924 | if (err) |
925 | return err; | |
926 | ||
f4f61d2c RW |
927 | err = fscrypt_setup_filename(dir, &dentry->d_name, 1, &nm); |
928 | if (err) | |
929 | return err; | |
930 | ||
9ca2d732 RW |
931 | err = ubifs_purge_xattrs(inode); |
932 | if (err) | |
933 | return err; | |
934 | ||
f4f61d2c RW |
935 | sz_change = CALC_DENT_SIZE(fname_len(&nm)); |
936 | ||
1e51764a AB |
937 | err = ubifs_budget_space(c, &req); |
938 | if (err) { | |
939 | if (err != -ENOSPC) | |
f4f61d2c | 940 | goto out_fname; |
1e51764a AB |
941 | budgeted = 0; |
942 | } | |
943 | ||
944 | lock_2_inodes(dir, inode); | |
d07d3a7e | 945 | inode_set_ctime_current(inode); |
1e51764a AB |
946 | clear_nlink(inode); |
947 | drop_nlink(dir); | |
948 | dir->i_size -= sz_change; | |
949 | dir_ui->ui_size = dir->i_size; | |
e4cfef33 JL |
950 | inode_set_mtime_to_ts(dir, |
951 | inode_set_ctime_to_ts(dir, inode_get_ctime(inode))); | |
f4f61d2c | 952 | err = ubifs_jnl_update(c, dir, &nm, inode, 1, 0); |
1e51764a AB |
953 | if (err) |
954 | goto out_cancel; | |
955 | unlock_2_inodes(dir, inode); | |
956 | ||
957 | if (budgeted) | |
958 | ubifs_release_budget(c, &req); | |
959 | else { | |
960 | /* We've deleted something - clean the "no space" flags */ | |
b137545c | 961 | c->bi.nospace = c->bi.nospace_rp = 0; |
1e51764a AB |
962 | smp_wmb(); |
963 | } | |
f4f61d2c | 964 | fscrypt_free_filename(&nm); |
1e51764a AB |
965 | return 0; |
966 | ||
967 | out_cancel: | |
968 | dir->i_size += sz_change; | |
969 | dir_ui->ui_size = dir->i_size; | |
970 | inc_nlink(dir); | |
c43be108 | 971 | set_nlink(inode, 2); |
1e51764a AB |
972 | unlock_2_inodes(dir, inode); |
973 | if (budgeted) | |
974 | ubifs_release_budget(c, &req); | |
f4f61d2c RW |
975 | out_fname: |
976 | fscrypt_free_filename(&nm); | |
1e51764a AB |
977 | return err; |
978 | } | |
979 | ||
c54bd91e | 980 | static int ubifs_mkdir(struct mnt_idmap *idmap, struct inode *dir, |
549c7297 | 981 | struct dentry *dentry, umode_t mode) |
1e51764a AB |
982 | { |
983 | struct inode *inode; | |
984 | struct ubifs_inode *dir_ui = ubifs_inode(dir); | |
985 | struct ubifs_info *c = dir->i_sb->s_fs_info; | |
f4f61d2c | 986 | int err, sz_change; |
a6dab660 ZC |
987 | struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1, |
988 | .dirtied_ino = 1}; | |
f4f61d2c | 989 | struct fscrypt_name nm; |
1e51764a AB |
990 | |
991 | /* | |
992 | * Budget request settings: new inode, new direntry and changing parent | |
993 | * directory inode. | |
994 | */ | |
995 | ||
4cb2a01d AV |
996 | dbg_gen("dent '%pd', mode %#hx in dir ino %lu", |
997 | dentry, mode, dir->i_ino); | |
1e51764a AB |
998 | |
999 | err = ubifs_budget_space(c, &req); | |
1000 | if (err) | |
1001 | return err; | |
1002 | ||
76786a0f | 1003 | err = ubifs_prepare_create(dir, dentry, &nm); |
f4f61d2c RW |
1004 | if (err) |
1005 | goto out_budg; | |
1006 | ||
1007 | sz_change = CALC_DENT_SIZE(fname_len(&nm)); | |
1008 | ||
a0c51565 | 1009 | inode = ubifs_new_inode(c, dir, S_IFDIR | mode, false); |
1e51764a AB |
1010 | if (IS_ERR(inode)) { |
1011 | err = PTR_ERR(inode); | |
f4f61d2c | 1012 | goto out_fname; |
1e51764a AB |
1013 | } |
1014 | ||
d7f0b70d SN |
1015 | err = ubifs_init_security(dir, inode, &dentry->d_name); |
1016 | if (err) | |
9401a795 | 1017 | goto out_inode; |
d7f0b70d | 1018 | |
1e51764a AB |
1019 | mutex_lock(&dir_ui->ui_mutex); |
1020 | insert_inode_hash(inode); | |
1021 | inc_nlink(inode); | |
1022 | inc_nlink(dir); | |
1023 | dir->i_size += sz_change; | |
1024 | dir_ui->ui_size = dir->i_size; | |
e4cfef33 JL |
1025 | inode_set_mtime_to_ts(dir, |
1026 | inode_set_ctime_to_ts(dir, inode_get_ctime(inode))); | |
f4f61d2c | 1027 | err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0); |
1e51764a | 1028 | if (err) { |
235c362b | 1029 | ubifs_err(c, "cannot create directory, error %d", err); |
1e51764a AB |
1030 | goto out_cancel; |
1031 | } | |
1032 | mutex_unlock(&dir_ui->ui_mutex); | |
1033 | ||
1034 | ubifs_release_budget(c, &req); | |
1035 | d_instantiate(dentry, inode); | |
f4f61d2c | 1036 | fscrypt_free_filename(&nm); |
1e51764a AB |
1037 | return 0; |
1038 | ||
1039 | out_cancel: | |
1040 | dir->i_size -= sz_change; | |
1041 | dir_ui->ui_size = dir->i_size; | |
1042 | drop_nlink(dir); | |
1043 | mutex_unlock(&dir_ui->ui_mutex); | |
9401a795 | 1044 | out_inode: |
1e51764a AB |
1045 | make_bad_inode(inode); |
1046 | iput(inode); | |
f4f61d2c RW |
1047 | out_fname: |
1048 | fscrypt_free_filename(&nm); | |
1e51764a AB |
1049 | out_budg: |
1050 | ubifs_release_budget(c, &req); | |
1051 | return err; | |
1052 | } | |
1053 | ||
5ebb29be | 1054 | static int ubifs_mknod(struct mnt_idmap *idmap, struct inode *dir, |
549c7297 | 1055 | struct dentry *dentry, umode_t mode, dev_t rdev) |
1e51764a AB |
1056 | { |
1057 | struct inode *inode; | |
1058 | struct ubifs_inode *ui; | |
1059 | struct ubifs_inode *dir_ui = ubifs_inode(dir); | |
1060 | struct ubifs_info *c = dir->i_sb->s_fs_info; | |
1061 | union ubifs_dev_desc *dev = NULL; | |
f4f61d2c | 1062 | int sz_change; |
1e51764a AB |
1063 | int err, devlen = 0; |
1064 | struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1, | |
dab4b4d2 | 1065 | .dirtied_ino = 1 }; |
f4f61d2c | 1066 | struct fscrypt_name nm; |
1e51764a AB |
1067 | |
1068 | /* | |
1069 | * Budget request settings: new inode, new direntry and changing parent | |
1070 | * directory inode. | |
1071 | */ | |
1072 | ||
4cb2a01d | 1073 | dbg_gen("dent '%pd' in dir ino %lu", dentry, dir->i_ino); |
1e51764a | 1074 | |
1e51764a AB |
1075 | if (S_ISBLK(mode) || S_ISCHR(mode)) { |
1076 | dev = kmalloc(sizeof(union ubifs_dev_desc), GFP_NOFS); | |
1077 | if (!dev) | |
1078 | return -ENOMEM; | |
1079 | devlen = ubifs_encode_dev(dev, rdev); | |
1080 | } | |
1081 | ||
4d35ca4f | 1082 | req.new_ino_d = ALIGN(devlen, 8); |
1e51764a AB |
1083 | err = ubifs_budget_space(c, &req); |
1084 | if (err) { | |
1085 | kfree(dev); | |
1086 | return err; | |
1087 | } | |
1088 | ||
76786a0f | 1089 | err = ubifs_prepare_create(dir, dentry, &nm); |
63ed6573 RW |
1090 | if (err) { |
1091 | kfree(dev); | |
f4f61d2c | 1092 | goto out_budg; |
63ed6573 | 1093 | } |
f4f61d2c RW |
1094 | |
1095 | sz_change = CALC_DENT_SIZE(fname_len(&nm)); | |
1096 | ||
a0c51565 | 1097 | inode = ubifs_new_inode(c, dir, mode, false); |
1e51764a AB |
1098 | if (IS_ERR(inode)) { |
1099 | kfree(dev); | |
1100 | err = PTR_ERR(inode); | |
f4f61d2c | 1101 | goto out_fname; |
1e51764a AB |
1102 | } |
1103 | ||
1104 | init_special_inode(inode, inode->i_mode, rdev); | |
1105 | inode->i_size = ubifs_inode(inode)->ui_size = devlen; | |
1106 | ui = ubifs_inode(inode); | |
1107 | ui->data = dev; | |
1108 | ui->data_len = devlen; | |
1109 | ||
d7f0b70d SN |
1110 | err = ubifs_init_security(dir, inode, &dentry->d_name); |
1111 | if (err) | |
9401a795 | 1112 | goto out_inode; |
d7f0b70d | 1113 | |
1e51764a AB |
1114 | mutex_lock(&dir_ui->ui_mutex); |
1115 | dir->i_size += sz_change; | |
1116 | dir_ui->ui_size = dir->i_size; | |
e4cfef33 JL |
1117 | inode_set_mtime_to_ts(dir, |
1118 | inode_set_ctime_to_ts(dir, inode_get_ctime(inode))); | |
f4f61d2c | 1119 | err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0); |
1e51764a AB |
1120 | if (err) |
1121 | goto out_cancel; | |
1122 | mutex_unlock(&dir_ui->ui_mutex); | |
1123 | ||
1124 | ubifs_release_budget(c, &req); | |
1125 | insert_inode_hash(inode); | |
1126 | d_instantiate(dentry, inode); | |
f4f61d2c | 1127 | fscrypt_free_filename(&nm); |
1e51764a AB |
1128 | return 0; |
1129 | ||
1130 | out_cancel: | |
1131 | dir->i_size -= sz_change; | |
1132 | dir_ui->ui_size = dir->i_size; | |
1133 | mutex_unlock(&dir_ui->ui_mutex); | |
9401a795 | 1134 | out_inode: |
1e51764a AB |
1135 | make_bad_inode(inode); |
1136 | iput(inode); | |
f4f61d2c RW |
1137 | out_fname: |
1138 | fscrypt_free_filename(&nm); | |
1e51764a AB |
1139 | out_budg: |
1140 | ubifs_release_budget(c, &req); | |
1141 | return err; | |
1142 | } | |
1143 | ||
7a77db95 | 1144 | static int ubifs_symlink(struct mnt_idmap *idmap, struct inode *dir, |
549c7297 | 1145 | struct dentry *dentry, const char *symname) |
1e51764a AB |
1146 | { |
1147 | struct inode *inode; | |
1148 | struct ubifs_inode *ui; | |
1149 | struct ubifs_inode *dir_ui = ubifs_inode(dir); | |
1150 | struct ubifs_info *c = dir->i_sb->s_fs_info; | |
00ee8b60 | 1151 | int err, sz_change, len = strlen(symname); |
0e4dda29 | 1152 | struct fscrypt_str disk_link; |
1e51764a | 1153 | struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1, |
dab4b4d2 | 1154 | .dirtied_ino = 1 }; |
ca7f85be RW |
1155 | struct fscrypt_name nm; |
1156 | ||
0e4dda29 EB |
1157 | dbg_gen("dent '%pd', target '%s' in dir ino %lu", dentry, |
1158 | symname, dir->i_ino); | |
ca7f85be | 1159 | |
0e4dda29 EB |
1160 | err = fscrypt_prepare_symlink(dir, symname, len, UBIFS_MAX_INO_DATA, |
1161 | &disk_link); | |
1162 | if (err) | |
1163 | return err; | |
1e51764a AB |
1164 | |
1165 | /* | |
1166 | * Budget request settings: new inode, new direntry and changing parent | |
1167 | * directory inode. | |
1168 | */ | |
c2c36cc6 | 1169 | req.new_ino_d = ALIGN(disk_link.len - 1, 8); |
1e51764a AB |
1170 | err = ubifs_budget_space(c, &req); |
1171 | if (err) | |
1172 | return err; | |
1173 | ||
76786a0f | 1174 | err = ubifs_prepare_create(dir, dentry, &nm); |
ca7f85be RW |
1175 | if (err) |
1176 | goto out_budg; | |
1177 | ||
00ee8b60 RW |
1178 | sz_change = CALC_DENT_SIZE(fname_len(&nm)); |
1179 | ||
a0c51565 | 1180 | inode = ubifs_new_inode(c, dir, S_IFLNK | S_IRWXUGO, false); |
1e51764a AB |
1181 | if (IS_ERR(inode)) { |
1182 | err = PTR_ERR(inode); | |
ca7f85be | 1183 | goto out_fname; |
1e51764a AB |
1184 | } |
1185 | ||
1186 | ui = ubifs_inode(inode); | |
ca7f85be | 1187 | ui->data = kmalloc(disk_link.len, GFP_NOFS); |
1e51764a AB |
1188 | if (!ui->data) { |
1189 | err = -ENOMEM; | |
1190 | goto out_inode; | |
1191 | } | |
1192 | ||
0e4dda29 EB |
1193 | if (IS_ENCRYPTED(inode)) { |
1194 | disk_link.name = ui->data; /* encrypt directly into ui->data */ | |
1195 | err = fscrypt_encrypt_symlink(inode, symname, len, &disk_link); | |
6b46d444 | 1196 | if (err) |
ca7f85be | 1197 | goto out_inode; |
ca7f85be | 1198 | } else { |
0e4dda29 | 1199 | memcpy(ui->data, disk_link.name, disk_link.len); |
ca7f85be RW |
1200 | inode->i_link = ui->data; |
1201 | } | |
1202 | ||
1e51764a AB |
1203 | /* |
1204 | * The terminating zero byte is not written to the flash media and it | |
1205 | * is put just to make later in-memory string processing simpler. Thus, | |
0e4dda29 | 1206 | * data length is @disk_link.len - 1, not @disk_link.len. |
1e51764a | 1207 | */ |
ca7f85be RW |
1208 | ui->data_len = disk_link.len - 1; |
1209 | inode->i_size = ubifs_inode(inode)->ui_size = disk_link.len - 1; | |
1e51764a | 1210 | |
d7f0b70d SN |
1211 | err = ubifs_init_security(dir, inode, &dentry->d_name); |
1212 | if (err) | |
9401a795 | 1213 | goto out_inode; |
d7f0b70d | 1214 | |
1e51764a AB |
1215 | mutex_lock(&dir_ui->ui_mutex); |
1216 | dir->i_size += sz_change; | |
1217 | dir_ui->ui_size = dir->i_size; | |
e4cfef33 JL |
1218 | inode_set_mtime_to_ts(dir, |
1219 | inode_set_ctime_to_ts(dir, inode_get_ctime(inode))); | |
ca7f85be | 1220 | err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0); |
1e51764a AB |
1221 | if (err) |
1222 | goto out_cancel; | |
1223 | mutex_unlock(&dir_ui->ui_mutex); | |
1224 | ||
1e51764a AB |
1225 | insert_inode_hash(inode); |
1226 | d_instantiate(dentry, inode); | |
6b46d444 EB |
1227 | err = 0; |
1228 | goto out_fname; | |
1e51764a AB |
1229 | |
1230 | out_cancel: | |
1231 | dir->i_size -= sz_change; | |
1232 | dir_ui->ui_size = dir->i_size; | |
1233 | mutex_unlock(&dir_ui->ui_mutex); | |
1234 | out_inode: | |
1235 | make_bad_inode(inode); | |
1236 | iput(inode); | |
ca7f85be RW |
1237 | out_fname: |
1238 | fscrypt_free_filename(&nm); | |
1e51764a AB |
1239 | out_budg: |
1240 | ubifs_release_budget(c, &req); | |
1241 | return err; | |
1242 | } | |
1243 | ||
1244 | /** | |
9e0a1fff | 1245 | * lock_4_inodes - a wrapper for locking three UBIFS inodes. |
1e51764a AB |
1246 | * @inode1: first inode |
1247 | * @inode2: second inode | |
1248 | * @inode3: third inode | |
7296c8af | 1249 | * @inode4: fourth inode |
1e51764a | 1250 | * |
82c1593c | 1251 | * This function is used for 'ubifs_rename()' and @inode1 may be the same as |
9e0a1fff | 1252 | * @inode2 whereas @inode3 and @inode4 may be %NULL. |
82c1593c AB |
1253 | * |
1254 | * We do not implement any tricks to guarantee strict lock ordering, because | |
1255 | * VFS has already done it for us on the @i_mutex. So this is just a simple | |
1256 | * wrapper function. | |
1e51764a | 1257 | */ |
9e0a1fff RW |
1258 | static void lock_4_inodes(struct inode *inode1, struct inode *inode2, |
1259 | struct inode *inode3, struct inode *inode4) | |
1e51764a | 1260 | { |
82c1593c AB |
1261 | mutex_lock_nested(&ubifs_inode(inode1)->ui_mutex, WB_MUTEX_1); |
1262 | if (inode2 != inode1) | |
1263 | mutex_lock_nested(&ubifs_inode(inode2)->ui_mutex, WB_MUTEX_2); | |
1264 | if (inode3) | |
1265 | mutex_lock_nested(&ubifs_inode(inode3)->ui_mutex, WB_MUTEX_3); | |
9e0a1fff RW |
1266 | if (inode4) |
1267 | mutex_lock_nested(&ubifs_inode(inode4)->ui_mutex, WB_MUTEX_4); | |
1e51764a AB |
1268 | } |
1269 | ||
1270 | /** | |
9e0a1fff | 1271 | * unlock_4_inodes - a wrapper for unlocking three UBIFS inodes for rename. |
1e51764a AB |
1272 | * @inode1: first inode |
1273 | * @inode2: second inode | |
1274 | * @inode3: third inode | |
7296c8af | 1275 | * @inode4: fourth inode |
1e51764a | 1276 | */ |
9e0a1fff RW |
1277 | static void unlock_4_inodes(struct inode *inode1, struct inode *inode2, |
1278 | struct inode *inode3, struct inode *inode4) | |
1e51764a | 1279 | { |
9e0a1fff RW |
1280 | if (inode4) |
1281 | mutex_unlock(&ubifs_inode(inode4)->ui_mutex); | |
1e51764a AB |
1282 | if (inode3) |
1283 | mutex_unlock(&ubifs_inode(inode3)->ui_mutex); | |
82c1593c AB |
1284 | if (inode1 != inode2) |
1285 | mutex_unlock(&ubifs_inode(inode2)->ui_mutex); | |
1286 | mutex_unlock(&ubifs_inode(inode1)->ui_mutex); | |
1e51764a AB |
1287 | } |
1288 | ||
390975ac RW |
1289 | static int do_rename(struct inode *old_dir, struct dentry *old_dentry, |
1290 | struct inode *new_dir, struct dentry *new_dentry, | |
1291 | unsigned int flags) | |
1e51764a AB |
1292 | { |
1293 | struct ubifs_info *c = old_dir->i_sb->s_fs_info; | |
2b0143b5 DH |
1294 | struct inode *old_inode = d_inode(old_dentry); |
1295 | struct inode *new_inode = d_inode(new_dentry); | |
9e0a1fff | 1296 | struct inode *whiteout = NULL; |
1e51764a | 1297 | struct ubifs_inode *old_inode_ui = ubifs_inode(old_inode); |
9e0a1fff | 1298 | struct ubifs_inode *whiteout_ui = NULL; |
1e51764a AB |
1299 | int err, release, sync = 0, move = (new_dir != old_dir); |
1300 | int is_dir = S_ISDIR(old_inode->i_mode); | |
f4f61d2c | 1301 | int unlink = !!new_inode, new_sz, old_sz; |
1e51764a AB |
1302 | struct ubifs_budget_req req = { .new_dent = 1, .mod_dent = 1, |
1303 | .dirtied_ino = 3 }; | |
1304 | struct ubifs_budget_req ino_req = { .dirtied_ino = 1, | |
dab4b4d2 | 1305 | .dirtied_ino_d = ALIGN(old_inode_ui->data_len, 8) }; |
278d9a24 | 1306 | struct ubifs_budget_req wht_req; |
3f649ab7 | 1307 | unsigned int saved_nlink; |
f4f61d2c | 1308 | struct fscrypt_name old_nm, new_nm; |
1e51764a AB |
1309 | |
1310 | /* | |
278d9a24 ZC |
1311 | * Budget request settings: |
1312 | * req: deletion direntry, new direntry, removing the old inode, | |
1313 | * and changing old and new parent directory inodes. | |
1e51764a | 1314 | * |
278d9a24 ZC |
1315 | * wht_req: new whiteout inode for RENAME_WHITEOUT. |
1316 | * | |
1317 | * ino_req: marks the target inode as dirty and does not write it. | |
1e51764a AB |
1318 | */ |
1319 | ||
9e0a1fff | 1320 | dbg_gen("dent '%pd' ino %lu in dir ino %lu to dent '%pd' in dir ino %lu flags 0x%x", |
4cb2a01d | 1321 | old_dentry, old_inode->i_ino, old_dir->i_ino, |
9e0a1fff RW |
1322 | new_dentry, new_dir->i_ino, flags); |
1323 | ||
9ca2d732 | 1324 | if (unlink) { |
6eb61d58 | 1325 | ubifs_assert(c, inode_is_locked(new_inode)); |
82c1593c | 1326 | |
25fce616 ZC |
1327 | /* Budget for old inode's data when its nlink > 1. */ |
1328 | req.dirtied_ino_d = ALIGN(ubifs_inode(new_inode)->data_len, 8); | |
9ca2d732 RW |
1329 | err = ubifs_purge_xattrs(new_inode); |
1330 | if (err) | |
1331 | return err; | |
1332 | } | |
1333 | ||
1e51764a | 1334 | if (unlink && is_dir) { |
f6337d84 | 1335 | err = ubifs_check_dir_empty(new_inode); |
1e51764a AB |
1336 | if (err) |
1337 | return err; | |
1338 | } | |
1339 | ||
f4f61d2c | 1340 | err = fscrypt_setup_filename(old_dir, &old_dentry->d_name, 0, &old_nm); |
1e51764a AB |
1341 | if (err) |
1342 | return err; | |
f4f61d2c RW |
1343 | |
1344 | err = fscrypt_setup_filename(new_dir, &new_dentry->d_name, 0, &new_nm); | |
1345 | if (err) { | |
1346 | fscrypt_free_filename(&old_nm); | |
1347 | return err; | |
1348 | } | |
1349 | ||
1350 | new_sz = CALC_DENT_SIZE(fname_len(&new_nm)); | |
1351 | old_sz = CALC_DENT_SIZE(fname_len(&old_nm)); | |
1352 | ||
1353 | err = ubifs_budget_space(c, &req); | |
1354 | if (err) { | |
1355 | fscrypt_free_filename(&old_nm); | |
1356 | fscrypt_free_filename(&new_nm); | |
1357 | return err; | |
1358 | } | |
1e51764a AB |
1359 | err = ubifs_budget_space(c, &ino_req); |
1360 | if (err) { | |
f4f61d2c RW |
1361 | fscrypt_free_filename(&old_nm); |
1362 | fscrypt_free_filename(&new_nm); | |
1e51764a AB |
1363 | ubifs_release_budget(c, &req); |
1364 | return err; | |
1365 | } | |
1366 | ||
9e0a1fff RW |
1367 | if (flags & RENAME_WHITEOUT) { |
1368 | union ubifs_dev_desc *dev = NULL; | |
1369 | ||
1370 | dev = kmalloc(sizeof(union ubifs_dev_desc), GFP_NOFS); | |
1371 | if (!dev) { | |
bb50c632 HL |
1372 | err = -ENOMEM; |
1373 | goto out_release; | |
9e0a1fff RW |
1374 | } |
1375 | ||
278d9a24 ZC |
1376 | /* |
1377 | * The whiteout inode without dentry is pinned in memory, | |
1378 | * umount won't happen during rename process because we | |
1379 | * got parent dentry. | |
1380 | */ | |
1381 | whiteout = create_whiteout(old_dir, old_dentry); | |
1382 | if (IS_ERR(whiteout)) { | |
1383 | err = PTR_ERR(whiteout); | |
9e0a1fff | 1384 | kfree(dev); |
bb50c632 | 1385 | goto out_release; |
9e0a1fff RW |
1386 | } |
1387 | ||
9e0a1fff RW |
1388 | whiteout_ui = ubifs_inode(whiteout); |
1389 | whiteout_ui->data = dev; | |
1390 | whiteout_ui->data_len = ubifs_encode_dev(dev, MKDEV(0, 0)); | |
6eb61d58 | 1391 | ubifs_assert(c, !whiteout_ui->dirty); |
afd42704 ZC |
1392 | |
1393 | memset(&wht_req, 0, sizeof(struct ubifs_budget_req)); | |
278d9a24 ZC |
1394 | wht_req.new_ino = 1; |
1395 | wht_req.new_ino_d = ALIGN(whiteout_ui->data_len, 8); | |
afd42704 ZC |
1396 | /* |
1397 | * To avoid deadlock between space budget (holds ui_mutex and | |
1398 | * waits wb work) and writeback work(waits ui_mutex), do space | |
1399 | * budget before ubifs inodes locked. | |
1400 | */ | |
1401 | err = ubifs_budget_space(c, &wht_req); | |
1402 | if (err) { | |
278d9a24 ZC |
1403 | /* |
1404 | * Whiteout inode can not be written on flash by | |
1405 | * ubifs_jnl_write_inode(), because it's neither | |
1406 | * dirty nor zero-nlink. | |
1407 | */ | |
afd42704 ZC |
1408 | iput(whiteout); |
1409 | goto out_release; | |
1410 | } | |
70575727 BL |
1411 | |
1412 | /* Add the old_dentry size to the old_dir size. */ | |
1413 | old_sz -= CALC_DENT_SIZE(fname_len(&old_nm)); | |
9e0a1fff RW |
1414 | } |
1415 | ||
1416 | lock_4_inodes(old_dir, new_dir, new_inode, whiteout); | |
1e51764a AB |
1417 | |
1418 | /* | |
1419 | * Like most other Unix systems, set the @i_ctime for inodes on a | |
1420 | * rename. | |
1421 | */ | |
e54c86fd | 1422 | simple_rename_timestamp(old_dir, old_dentry, new_dir, new_dentry); |
1e51764a AB |
1423 | |
1424 | /* We must adjust parent link count when renaming directories */ | |
1425 | if (is_dir) { | |
1426 | if (move) { | |
1427 | /* | |
1428 | * @old_dir loses a link because we are moving | |
1429 | * @old_inode to a different directory. | |
1430 | */ | |
1431 | drop_nlink(old_dir); | |
1432 | /* | |
1433 | * @new_dir only gains a link if we are not also | |
1434 | * overwriting an existing directory. | |
1435 | */ | |
1436 | if (!unlink) | |
1437 | inc_nlink(new_dir); | |
1438 | } else { | |
1439 | /* | |
1440 | * @old_inode is not moving to a different directory, | |
1441 | * but @old_dir still loses a link if we are | |
1442 | * overwriting an existing directory. | |
1443 | */ | |
1444 | if (unlink) | |
1445 | drop_nlink(old_dir); | |
1446 | } | |
1447 | } | |
1448 | ||
1449 | old_dir->i_size -= old_sz; | |
1450 | ubifs_inode(old_dir)->ui_size = old_dir->i_size; | |
1e51764a AB |
1451 | |
1452 | /* | |
1453 | * And finally, if we unlinked a direntry which happened to have the | |
1454 | * same name as the moved direntry, we have to decrement @i_nlink of | |
e54c86fd | 1455 | * the unlinked inode. |
1e51764a AB |
1456 | */ |
1457 | if (unlink) { | |
1458 | /* | |
1459 | * Directories cannot have hard-links, so if this is a | |
c43be108 | 1460 | * directory, just clear @i_nlink. |
1e51764a | 1461 | */ |
c43be108 | 1462 | saved_nlink = new_inode->i_nlink; |
1e51764a | 1463 | if (is_dir) |
c43be108 AB |
1464 | clear_nlink(new_inode); |
1465 | else | |
1e51764a | 1466 | drop_nlink(new_inode); |
1e51764a AB |
1467 | } else { |
1468 | new_dir->i_size += new_sz; | |
1469 | ubifs_inode(new_dir)->ui_size = new_dir->i_size; | |
1470 | } | |
1471 | ||
1472 | /* | |
1473 | * Do not ask 'ubifs_jnl_rename()' to flush write-buffer if @old_inode | |
1474 | * is dirty, because this will be done later on at the end of | |
1475 | * 'ubifs_rename()'. | |
1476 | */ | |
1477 | if (IS_SYNC(old_inode)) { | |
1478 | sync = IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir); | |
1479 | if (unlink && IS_SYNC(new_inode)) | |
1480 | sync = 1; | |
278d9a24 ZC |
1481 | /* |
1482 | * S_SYNC flag of whiteout inherits from the old_dir, and we | |
1483 | * have already checked the old dir inode. So there is no need | |
1484 | * to check whiteout. | |
1485 | */ | |
9e0a1fff RW |
1486 | } |
1487 | ||
f4f61d2c RW |
1488 | err = ubifs_jnl_rename(c, old_dir, old_inode, &old_nm, new_dir, |
1489 | new_inode, &new_nm, whiteout, sync); | |
1e51764a AB |
1490 | if (err) |
1491 | goto out_cancel; | |
1492 | ||
9e0a1fff | 1493 | unlock_4_inodes(old_dir, new_dir, new_inode, whiteout); |
1e51764a AB |
1494 | ubifs_release_budget(c, &req); |
1495 | ||
278d9a24 ZC |
1496 | if (whiteout) { |
1497 | ubifs_release_budget(c, &wht_req); | |
1498 | iput(whiteout); | |
1499 | } | |
1500 | ||
1e51764a AB |
1501 | mutex_lock(&old_inode_ui->ui_mutex); |
1502 | release = old_inode_ui->dirty; | |
1503 | mark_inode_dirty_sync(old_inode); | |
1504 | mutex_unlock(&old_inode_ui->ui_mutex); | |
1505 | ||
1506 | if (release) | |
1507 | ubifs_release_budget(c, &ino_req); | |
1508 | if (IS_SYNC(old_inode)) | |
278d9a24 ZC |
1509 | /* |
1510 | * Rename finished here. Although old inode cannot be updated | |
1511 | * on flash, old ctime is not a big problem, don't return err | |
1512 | * code to userspace. | |
1513 | */ | |
1514 | old_inode->i_sb->s_op->write_inode(old_inode, NULL); | |
f4f61d2c RW |
1515 | |
1516 | fscrypt_free_filename(&old_nm); | |
1517 | fscrypt_free_filename(&new_nm); | |
278d9a24 | 1518 | return 0; |
1e51764a AB |
1519 | |
1520 | out_cancel: | |
1521 | if (unlink) { | |
c43be108 | 1522 | set_nlink(new_inode, saved_nlink); |
1e51764a AB |
1523 | } else { |
1524 | new_dir->i_size -= new_sz; | |
1525 | ubifs_inode(new_dir)->ui_size = new_dir->i_size; | |
1526 | } | |
1527 | old_dir->i_size += old_sz; | |
1528 | ubifs_inode(old_dir)->ui_size = old_dir->i_size; | |
1529 | if (is_dir) { | |
1530 | if (move) { | |
1531 | inc_nlink(old_dir); | |
1532 | if (!unlink) | |
1533 | drop_nlink(new_dir); | |
1534 | } else { | |
1535 | if (unlink) | |
1536 | inc_nlink(old_dir); | |
1537 | } | |
1538 | } | |
278d9a24 | 1539 | unlock_4_inodes(old_dir, new_dir, new_inode, whiteout); |
9e0a1fff | 1540 | if (whiteout) { |
278d9a24 | 1541 | ubifs_release_budget(c, &wht_req); |
9e0a1fff RW |
1542 | iput(whiteout); |
1543 | } | |
bb50c632 | 1544 | out_release: |
1e51764a AB |
1545 | ubifs_release_budget(c, &ino_req); |
1546 | ubifs_release_budget(c, &req); | |
f4f61d2c RW |
1547 | fscrypt_free_filename(&old_nm); |
1548 | fscrypt_free_filename(&new_nm); | |
1e51764a AB |
1549 | return err; |
1550 | } | |
1551 | ||
9ec64962 RW |
1552 | static int ubifs_xrename(struct inode *old_dir, struct dentry *old_dentry, |
1553 | struct inode *new_dir, struct dentry *new_dentry) | |
1554 | { | |
1555 | struct ubifs_info *c = old_dir->i_sb->s_fs_info; | |
1556 | struct ubifs_budget_req req = { .new_dent = 1, .mod_dent = 1, | |
1557 | .dirtied_ino = 2 }; | |
1558 | int sync = IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir); | |
1559 | struct inode *fst_inode = d_inode(old_dentry); | |
1560 | struct inode *snd_inode = d_inode(new_dentry); | |
9ec64962 | 1561 | int err; |
f4f61d2c | 1562 | struct fscrypt_name fst_nm, snd_nm; |
9ec64962 | 1563 | |
6eb61d58 | 1564 | ubifs_assert(c, fst_inode && snd_inode); |
9ec64962 | 1565 | |
c04cc68d ZC |
1566 | /* |
1567 | * Budget request settings: changing two direntries, changing the two | |
1568 | * parent directory inodes. | |
1569 | */ | |
1570 | ||
1571 | dbg_gen("dent '%pd' ino %lu in dir ino %lu exchange dent '%pd' ino %lu in dir ino %lu", | |
1572 | old_dentry, fst_inode->i_ino, old_dir->i_ino, | |
1573 | new_dentry, snd_inode->i_ino, new_dir->i_ino); | |
1574 | ||
f4f61d2c RW |
1575 | err = fscrypt_setup_filename(old_dir, &old_dentry->d_name, 0, &fst_nm); |
1576 | if (err) | |
1577 | return err; | |
1578 | ||
1579 | err = fscrypt_setup_filename(new_dir, &new_dentry->d_name, 0, &snd_nm); | |
1580 | if (err) { | |
1581 | fscrypt_free_filename(&fst_nm); | |
1582 | return err; | |
1583 | } | |
1584 | ||
1b2ba090 ZC |
1585 | err = ubifs_budget_space(c, &req); |
1586 | if (err) | |
1587 | goto out; | |
1588 | ||
9ec64962 RW |
1589 | lock_4_inodes(old_dir, new_dir, NULL, NULL); |
1590 | ||
e54c86fd | 1591 | simple_rename_timestamp(old_dir, old_dentry, new_dir, new_dentry); |
9ec64962 RW |
1592 | |
1593 | if (old_dir != new_dir) { | |
1594 | if (S_ISDIR(fst_inode->i_mode) && !S_ISDIR(snd_inode->i_mode)) { | |
1595 | inc_nlink(new_dir); | |
1596 | drop_nlink(old_dir); | |
1597 | } | |
1598 | else if (!S_ISDIR(fst_inode->i_mode) && S_ISDIR(snd_inode->i_mode)) { | |
1599 | drop_nlink(new_dir); | |
1600 | inc_nlink(old_dir); | |
1601 | } | |
1602 | } | |
1603 | ||
f4f61d2c RW |
1604 | err = ubifs_jnl_xrename(c, old_dir, fst_inode, &fst_nm, new_dir, |
1605 | snd_inode, &snd_nm, sync); | |
9ec64962 RW |
1606 | |
1607 | unlock_4_inodes(old_dir, new_dir, NULL, NULL); | |
1608 | ubifs_release_budget(c, &req); | |
1609 | ||
1b2ba090 | 1610 | out: |
f4f61d2c RW |
1611 | fscrypt_free_filename(&fst_nm); |
1612 | fscrypt_free_filename(&snd_nm); | |
9ec64962 RW |
1613 | return err; |
1614 | } | |
1615 | ||
e18275ae | 1616 | static int ubifs_rename(struct mnt_idmap *idmap, |
549c7297 | 1617 | struct inode *old_dir, struct dentry *old_dentry, |
9ec64962 RW |
1618 | struct inode *new_dir, struct dentry *new_dentry, |
1619 | unsigned int flags) | |
1620 | { | |
0c1ad524 | 1621 | int err; |
6eb61d58 | 1622 | struct ubifs_info *c = old_dir->i_sb->s_fs_info; |
0c1ad524 | 1623 | |
9ec64962 RW |
1624 | if (flags & ~(RENAME_NOREPLACE | RENAME_WHITEOUT | RENAME_EXCHANGE)) |
1625 | return -EINVAL; | |
1626 | ||
6eb61d58 RW |
1627 | ubifs_assert(c, inode_is_locked(old_dir)); |
1628 | ubifs_assert(c, inode_is_locked(new_dir)); | |
9ec64962 | 1629 | |
0c1ad524 EB |
1630 | err = fscrypt_prepare_rename(old_dir, old_dentry, new_dir, new_dentry, |
1631 | flags); | |
1632 | if (err) | |
1633 | return err; | |
1634 | ||
9ec64962 RW |
1635 | if (flags & RENAME_EXCHANGE) |
1636 | return ubifs_xrename(old_dir, old_dentry, new_dir, new_dentry); | |
1637 | ||
390975ac | 1638 | return do_rename(old_dir, old_dentry, new_dir, new_dentry, flags); |
9ec64962 RW |
1639 | } |
1640 | ||
b74d24f7 | 1641 | int ubifs_getattr(struct mnt_idmap *idmap, const struct path *path, |
549c7297 | 1642 | struct kstat *stat, u32 request_mask, unsigned int flags) |
1e51764a AB |
1643 | { |
1644 | loff_t size; | |
a528d35e | 1645 | struct inode *inode = d_inode(path->dentry); |
1e51764a AB |
1646 | struct ubifs_inode *ui = ubifs_inode(inode); |
1647 | ||
1648 | mutex_lock(&ui->ui_mutex); | |
a02a6eba RW |
1649 | |
1650 | if (ui->flags & UBIFS_APPEND_FL) | |
1651 | stat->attributes |= STATX_ATTR_APPEND; | |
1652 | if (ui->flags & UBIFS_COMPR_FL) | |
1653 | stat->attributes |= STATX_ATTR_COMPRESSED; | |
1654 | if (ui->flags & UBIFS_CRYPT_FL) | |
1655 | stat->attributes |= STATX_ATTR_ENCRYPTED; | |
1656 | if (ui->flags & UBIFS_IMMUTABLE_FL) | |
1657 | stat->attributes |= STATX_ATTR_IMMUTABLE; | |
1658 | ||
1659 | stat->attributes_mask |= (STATX_ATTR_APPEND | | |
1660 | STATX_ATTR_COMPRESSED | | |
1661 | STATX_ATTR_ENCRYPTED | | |
1662 | STATX_ATTR_IMMUTABLE); | |
1663 | ||
0d72b928 | 1664 | generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat); |
1e51764a AB |
1665 | stat->blksize = UBIFS_BLOCK_SIZE; |
1666 | stat->size = ui->ui_size; | |
1667 | ||
1668 | /* | |
1669 | * Unfortunately, the 'stat()' system call was designed for block | |
1670 | * device based file systems, and it is not appropriate for UBIFS, | |
1671 | * because UBIFS does not have notion of "block". For example, it is | |
1672 | * difficult to tell how many block a directory takes - it actually | |
1673 | * takes less than 300 bytes, but we have to round it to block size, | |
1674 | * which introduces large mistake. This makes utilities like 'du' to | |
1675 | * report completely senseless numbers. This is the reason why UBIFS | |
1676 | * goes the same way as JFFS2 - it reports zero blocks for everything | |
1677 | * but regular files, which makes more sense than reporting completely | |
1678 | * wrong sizes. | |
1679 | */ | |
1680 | if (S_ISREG(inode->i_mode)) { | |
1681 | size = ui->xattr_size; | |
1682 | size += stat->size; | |
1683 | size = ALIGN(size, UBIFS_BLOCK_SIZE); | |
1684 | /* | |
1685 | * Note, user-space expects 512-byte blocks count irrespectively | |
1686 | * of what was reported in @stat->size. | |
1687 | */ | |
1688 | stat->blocks = size >> 9; | |
1689 | } else | |
1690 | stat->blocks = 0; | |
1691 | mutex_unlock(&ui->ui_mutex); | |
1692 | return 0; | |
1693 | } | |
1694 | ||
e8b81566 | 1695 | const struct inode_operations ubifs_dir_inode_operations = { |
1e51764a AB |
1696 | .lookup = ubifs_lookup, |
1697 | .create = ubifs_create, | |
1698 | .link = ubifs_link, | |
1699 | .symlink = ubifs_symlink, | |
1700 | .unlink = ubifs_unlink, | |
1701 | .mkdir = ubifs_mkdir, | |
1702 | .rmdir = ubifs_rmdir, | |
1703 | .mknod = ubifs_mknod, | |
390975ac | 1704 | .rename = ubifs_rename, |
1e51764a AB |
1705 | .setattr = ubifs_setattr, |
1706 | .getattr = ubifs_getattr, | |
1e51764a | 1707 | .listxattr = ubifs_listxattr, |
8c1c5f26 | 1708 | .update_time = ubifs_update_time, |
474b9370 | 1709 | .tmpfile = ubifs_tmpfile, |
8871d84c MS |
1710 | .fileattr_get = ubifs_fileattr_get, |
1711 | .fileattr_set = ubifs_fileattr_set, | |
1e51764a AB |
1712 | }; |
1713 | ||
e8b81566 | 1714 | const struct file_operations ubifs_dir_operations = { |
01122e06 | 1715 | .llseek = generic_file_llseek, |
1e51764a AB |
1716 | .release = ubifs_dir_release, |
1717 | .read = generic_read_dir, | |
c51da20c | 1718 | .iterate_shared = ubifs_readdir, |
1e51764a AB |
1719 | .fsync = ubifs_fsync, |
1720 | .unlocked_ioctl = ubifs_ioctl, | |
1721 | #ifdef CONFIG_COMPAT | |
1722 | .compat_ioctl = ubifs_compat_ioctl, | |
1723 | #endif | |
1724 | }; |