1 | // SPDX-License-Identifier: GPL-2.0-only |
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 | * |
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 | */ |
47 | static int inherit_flags(const struct inode *dir, umode_t mode) |
48 | { |
49 | int flags; |
50 | const struct ubifs_inode *ui = ubifs_inode(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 | * @is_xattr: whether the inode is xattr inode |
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 | */ |
77 | struct inode *ubifs_new_inode(struct ubifs_info *c, struct inode *dir, |
78 | umode_t mode, bool is_xattr) |
79 | { |
80 | int err; |
81 | struct inode *inode; |
82 | struct ubifs_inode *ui; |
83 | bool encrypted = false; |
84 | |
85 | inode = new_inode(sb: c->vfs_sb); |
86 | ui = ubifs_inode(inode); |
87 | if (!inode) |
88 | return ERR_PTR(error: -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 | */ |
96 | inode->i_flags |= S_NOCMTIME; |
97 | |
98 | inode_init_owner(idmap: &nop_mnt_idmap, inode, dir, mode); |
99 | simple_inode_init_ts(inode); |
100 | inode->i_mapping->nrpages = 0; |
101 | |
102 | if (!is_xattr) { |
103 | err = fscrypt_prepare_new_inode(dir, inode, encrypt_ret: &encrypted); |
104 | if (err) { |
105 | ubifs_err(c, fmt: "fscrypt_prepare_new_inode failed: %i" , err); |
106 | goto out_iput; |
107 | } |
108 | } |
109 | |
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(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(lock: &c->cnt_lock); |
147 | ubifs_err(c, fmt: "out of inode numbers" ); |
148 | err = -EINVAL; |
149 | goto out_iput; |
150 | } |
151 | ubifs_warn(c, fmt: "running out of inode numbers (current %lu, max %u)" , |
152 | (unsigned long)c->highest_inum, INUM_WATERMARK); |
153 | } |
154 | |
155 | inode->i_ino = ++c->highest_inum; |
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(lock: &c->cnt_lock); |
165 | |
166 | if (encrypted) { |
167 | err = fscrypt_set_context(inode, NULL); |
168 | if (err) { |
169 | ubifs_err(c, fmt: "fscrypt_set_context failed: %i" , err); |
170 | goto out_iput; |
171 | } |
172 | } |
173 | |
174 | return inode; |
175 | |
176 | out_iput: |
177 | make_bad_inode(inode); |
178 | iput(inode); |
179 | return ERR_PTR(error: err); |
180 | } |
181 | |
182 | static int dbg_check_name(const struct ubifs_info *c, |
183 | const struct ubifs_dent_node *dent, |
184 | const struct fscrypt_name *nm) |
185 | { |
186 | if (!dbg_is_chk_gen(c)) |
187 | return 0; |
188 | if (le16_to_cpu(dent->nlen) != fname_len(nm)) |
189 | return -EINVAL; |
190 | if (memcmp(p: dent->name, fname_name(nm), fname_len(nm))) |
191 | return -EINVAL; |
192 | return 0; |
193 | } |
194 | |
195 | static struct dentry *ubifs_lookup(struct inode *dir, struct dentry *dentry, |
196 | unsigned int flags) |
197 | { |
198 | int err; |
199 | union ubifs_key key; |
200 | struct inode *inode = NULL; |
201 | struct ubifs_dent_node *dent = NULL; |
202 | struct ubifs_info *c = dir->i_sb->s_fs_info; |
203 | struct fscrypt_name nm; |
204 | |
205 | dbg_gen("'%pd' in dir ino %lu" , dentry, dir->i_ino); |
206 | |
207 | err = fscrypt_prepare_lookup(dir, dentry, fname: &nm); |
208 | if (err == -ENOENT) |
209 | return d_splice_alias(NULL, dentry); |
210 | if (err) |
211 | return ERR_PTR(error: err); |
212 | |
213 | if (fname_len(&nm) > UBIFS_MAX_NLEN) { |
214 | inode = ERR_PTR(error: -ENAMETOOLONG); |
215 | goto done; |
216 | } |
217 | |
218 | dent = kmalloc(UBIFS_MAX_DENT_NODE_SZ, GFP_NOFS); |
219 | if (!dent) { |
220 | inode = ERR_PTR(error: -ENOMEM); |
221 | goto done; |
222 | } |
223 | |
224 | if (fname_name(&nm) == NULL) { |
225 | if (nm.hash & ~UBIFS_S_KEY_HASH_MASK) |
226 | goto done; /* ENOENT */ |
227 | dent_key_init_hash(c, key: &key, inum: dir->i_ino, hash: nm.hash); |
228 | err = ubifs_tnc_lookup_dh(c, key: &key, node: dent, secondary_hash: nm.minor_hash); |
229 | } else { |
230 | dent_key_init(c, key: &key, inum: dir->i_ino, nm: &nm); |
231 | err = ubifs_tnc_lookup_nm(c, key: &key, node: dent, nm: &nm); |
232 | } |
233 | |
234 | if (err) { |
235 | if (err == -ENOENT) |
236 | dbg_gen("not found" ); |
237 | else |
238 | inode = ERR_PTR(error: err); |
239 | goto done; |
240 | } |
241 | |
242 | if (dbg_check_name(c, dent, nm: &nm)) { |
243 | inode = ERR_PTR(error: -EINVAL); |
244 | goto done; |
245 | } |
246 | |
247 | inode = ubifs_iget(sb: dir->i_sb, le64_to_cpu(dent->inum)); |
248 | if (IS_ERR(ptr: inode)) { |
249 | /* |
250 | * This should not happen. Probably the file-system needs |
251 | * checking. |
252 | */ |
253 | err = PTR_ERR(ptr: inode); |
254 | ubifs_err(c, fmt: "dead directory entry '%pd', error %d" , |
255 | dentry, err); |
256 | ubifs_ro_mode(c, err); |
257 | goto done; |
258 | } |
259 | |
260 | if (IS_ENCRYPTED(dir) && |
261 | (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) && |
262 | !fscrypt_has_permitted_context(parent: dir, child: inode)) { |
263 | ubifs_warn(c, fmt: "Inconsistent encryption contexts: %lu/%lu" , |
264 | dir->i_ino, inode->i_ino); |
265 | iput(inode); |
266 | inode = ERR_PTR(error: -EPERM); |
267 | } |
268 | |
269 | done: |
270 | kfree(objp: dent); |
271 | fscrypt_free_filename(fname: &nm); |
272 | return d_splice_alias(inode, dentry); |
273 | } |
274 | |
275 | static int ubifs_prepare_create(struct inode *dir, struct dentry *dentry, |
276 | struct fscrypt_name *nm) |
277 | { |
278 | if (fscrypt_is_nokey_name(dentry)) |
279 | return -ENOKEY; |
280 | |
281 | return fscrypt_setup_filename(inode: dir, iname: &dentry->d_name, lookup: 0, fname: nm); |
282 | } |
283 | |
284 | static int ubifs_create(struct mnt_idmap *idmap, struct inode *dir, |
285 | struct dentry *dentry, umode_t mode, bool excl) |
286 | { |
287 | struct inode *inode; |
288 | struct ubifs_info *c = dir->i_sb->s_fs_info; |
289 | struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1, |
290 | .dirtied_ino = 1 }; |
291 | struct ubifs_inode *dir_ui = ubifs_inode(inode: dir); |
292 | struct fscrypt_name nm; |
293 | int err, sz_change; |
294 | |
295 | /* |
296 | * Budget request settings: new inode, new direntry, changing the |
297 | * parent directory inode. |
298 | */ |
299 | |
300 | dbg_gen("dent '%pd', mode %#hx in dir ino %lu" , |
301 | dentry, mode, dir->i_ino); |
302 | |
303 | err = ubifs_budget_space(c, req: &req); |
304 | if (err) |
305 | return err; |
306 | |
307 | err = ubifs_prepare_create(dir, dentry, nm: &nm); |
308 | if (err) |
309 | goto out_budg; |
310 | |
311 | sz_change = CALC_DENT_SIZE(fname_len(&nm)); |
312 | |
313 | inode = ubifs_new_inode(c, dir, mode, is_xattr: false); |
314 | if (IS_ERR(ptr: inode)) { |
315 | err = PTR_ERR(ptr: inode); |
316 | goto out_fname; |
317 | } |
318 | |
319 | err = ubifs_init_security(dentry: dir, inode, qstr: &dentry->d_name); |
320 | if (err) |
321 | goto out_inode; |
322 | |
323 | mutex_lock(&dir_ui->ui_mutex); |
324 | dir->i_size += sz_change; |
325 | dir_ui->ui_size = dir->i_size; |
326 | inode_set_mtime_to_ts(inode: dir, |
327 | ts: inode_set_ctime_to_ts(inode: dir, ts: inode_get_ctime(inode))); |
328 | err = ubifs_jnl_update(c, dir, nm: &nm, inode, deletion: 0, xent: 0); |
329 | if (err) |
330 | goto out_cancel; |
331 | mutex_unlock(lock: &dir_ui->ui_mutex); |
332 | |
333 | ubifs_release_budget(c, req: &req); |
334 | fscrypt_free_filename(fname: &nm); |
335 | insert_inode_hash(inode); |
336 | d_instantiate(dentry, inode); |
337 | return 0; |
338 | |
339 | out_cancel: |
340 | dir->i_size -= sz_change; |
341 | dir_ui->ui_size = dir->i_size; |
342 | mutex_unlock(lock: &dir_ui->ui_mutex); |
343 | out_inode: |
344 | make_bad_inode(inode); |
345 | iput(inode); |
346 | out_fname: |
347 | fscrypt_free_filename(fname: &nm); |
348 | out_budg: |
349 | ubifs_release_budget(c, req: &req); |
350 | ubifs_err(c, fmt: "cannot create regular file, error %d" , err); |
351 | return err; |
352 | } |
353 | |
354 | static struct inode *create_whiteout(struct inode *dir, struct dentry *dentry) |
355 | { |
356 | int err; |
357 | umode_t mode = S_IFCHR | WHITEOUT_MODE; |
358 | struct inode *inode; |
359 | struct ubifs_info *c = dir->i_sb->s_fs_info; |
360 | |
361 | /* |
362 | * Create an inode('nlink = 1') for whiteout without updating journal, |
363 | * let ubifs_jnl_rename() store it on flash to complete rename whiteout |
364 | * atomically. |
365 | */ |
366 | |
367 | dbg_gen("dent '%pd', mode %#hx in dir ino %lu" , |
368 | dentry, mode, dir->i_ino); |
369 | |
370 | inode = ubifs_new_inode(c, dir, mode, is_xattr: false); |
371 | if (IS_ERR(ptr: inode)) { |
372 | err = PTR_ERR(ptr: inode); |
373 | goto out_free; |
374 | } |
375 | |
376 | init_special_inode(inode, inode->i_mode, WHITEOUT_DEV); |
377 | ubifs_assert(c, inode->i_op == &ubifs_file_inode_operations); |
378 | |
379 | err = ubifs_init_security(dentry: dir, inode, qstr: &dentry->d_name); |
380 | if (err) |
381 | goto out_inode; |
382 | |
383 | /* The dir size is updated by do_rename. */ |
384 | insert_inode_hash(inode); |
385 | |
386 | return inode; |
387 | |
388 | out_inode: |
389 | make_bad_inode(inode); |
390 | iput(inode); |
391 | out_free: |
392 | ubifs_err(c, fmt: "cannot create whiteout file, error %d" , err); |
393 | return ERR_PTR(error: err); |
394 | } |
395 | |
396 | /** |
397 | * lock_2_inodes - a wrapper for locking two UBIFS inodes. |
398 | * @inode1: first inode |
399 | * @inode2: second inode |
400 | * |
401 | * We do not implement any tricks to guarantee strict lock ordering, because |
402 | * VFS has already done it for us on the @i_mutex. So this is just a simple |
403 | * wrapper function. |
404 | */ |
405 | static void lock_2_inodes(struct inode *inode1, struct inode *inode2) |
406 | { |
407 | mutex_lock_nested(lock: &ubifs_inode(inode: inode1)->ui_mutex, subclass: WB_MUTEX_1); |
408 | mutex_lock_nested(lock: &ubifs_inode(inode: inode2)->ui_mutex, subclass: WB_MUTEX_2); |
409 | } |
410 | |
411 | /** |
412 | * unlock_2_inodes - a wrapper for unlocking two UBIFS inodes. |
413 | * @inode1: first inode |
414 | * @inode2: second inode |
415 | */ |
416 | static void unlock_2_inodes(struct inode *inode1, struct inode *inode2) |
417 | { |
418 | mutex_unlock(lock: &ubifs_inode(inode: inode2)->ui_mutex); |
419 | mutex_unlock(lock: &ubifs_inode(inode: inode1)->ui_mutex); |
420 | } |
421 | |
422 | static int ubifs_tmpfile(struct mnt_idmap *idmap, struct inode *dir, |
423 | struct file *file, umode_t mode) |
424 | { |
425 | struct dentry *dentry = file->f_path.dentry; |
426 | struct inode *inode; |
427 | struct ubifs_info *c = dir->i_sb->s_fs_info; |
428 | struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1, |
429 | .dirtied_ino = 1}; |
430 | struct ubifs_budget_req ino_req = { .dirtied_ino = 1 }; |
431 | struct ubifs_inode *ui; |
432 | int err, instantiated = 0; |
433 | struct fscrypt_name nm; |
434 | |
435 | /* |
436 | * Budget request settings: new inode, new direntry, changing the |
437 | * parent directory inode. |
438 | * Allocate budget separately for new dirtied inode, the budget will |
439 | * be released via writeback. |
440 | */ |
441 | |
442 | dbg_gen("dent '%pd', mode %#hx in dir ino %lu" , |
443 | dentry, mode, dir->i_ino); |
444 | |
445 | err = fscrypt_setup_filename(inode: dir, iname: &dentry->d_name, lookup: 0, fname: &nm); |
446 | if (err) |
447 | return err; |
448 | |
449 | err = ubifs_budget_space(c, req: &req); |
450 | if (err) { |
451 | fscrypt_free_filename(fname: &nm); |
452 | return err; |
453 | } |
454 | |
455 | err = ubifs_budget_space(c, req: &ino_req); |
456 | if (err) { |
457 | ubifs_release_budget(c, req: &req); |
458 | fscrypt_free_filename(fname: &nm); |
459 | return err; |
460 | } |
461 | |
462 | inode = ubifs_new_inode(c, dir, mode, is_xattr: false); |
463 | if (IS_ERR(ptr: inode)) { |
464 | err = PTR_ERR(ptr: inode); |
465 | goto out_budg; |
466 | } |
467 | ui = ubifs_inode(inode); |
468 | |
469 | err = ubifs_init_security(dentry: dir, inode, qstr: &dentry->d_name); |
470 | if (err) |
471 | goto out_inode; |
472 | |
473 | mutex_lock(&ui->ui_mutex); |
474 | insert_inode_hash(inode); |
475 | d_tmpfile(file, inode); |
476 | ubifs_assert(c, ui->dirty); |
477 | |
478 | instantiated = 1; |
479 | mutex_unlock(lock: &ui->ui_mutex); |
480 | |
481 | lock_2_inodes(inode1: dir, inode2: inode); |
482 | err = ubifs_jnl_update(c, dir, nm: &nm, inode, deletion: 1, xent: 0); |
483 | if (err) |
484 | goto out_cancel; |
485 | unlock_2_inodes(inode1: dir, inode2: inode); |
486 | |
487 | ubifs_release_budget(c, req: &req); |
488 | fscrypt_free_filename(fname: &nm); |
489 | |
490 | return finish_open_simple(file, error: 0); |
491 | |
492 | out_cancel: |
493 | unlock_2_inodes(inode1: dir, inode2: inode); |
494 | out_inode: |
495 | make_bad_inode(inode); |
496 | if (!instantiated) |
497 | iput(inode); |
498 | out_budg: |
499 | ubifs_release_budget(c, req: &req); |
500 | if (!instantiated) |
501 | ubifs_release_budget(c, req: &ino_req); |
502 | fscrypt_free_filename(fname: &nm); |
503 | ubifs_err(c, fmt: "cannot create temporary file, error %d" , err); |
504 | return err; |
505 | } |
506 | |
507 | /** |
508 | * vfs_dent_type - get VFS directory entry type. |
509 | * @type: UBIFS directory entry type |
510 | * |
511 | * This function converts UBIFS directory entry type into VFS directory entry |
512 | * type. |
513 | */ |
514 | static unsigned int vfs_dent_type(uint8_t type) |
515 | { |
516 | switch (type) { |
517 | case UBIFS_ITYPE_REG: |
518 | return DT_REG; |
519 | case UBIFS_ITYPE_DIR: |
520 | return DT_DIR; |
521 | case UBIFS_ITYPE_LNK: |
522 | return DT_LNK; |
523 | case UBIFS_ITYPE_BLK: |
524 | return DT_BLK; |
525 | case UBIFS_ITYPE_CHR: |
526 | return DT_CHR; |
527 | case UBIFS_ITYPE_FIFO: |
528 | return DT_FIFO; |
529 | case UBIFS_ITYPE_SOCK: |
530 | return DT_SOCK; |
531 | default: |
532 | BUG(); |
533 | } |
534 | return 0; |
535 | } |
536 | |
537 | /* |
538 | * The classical Unix view for directory is that it is a linear array of |
539 | * (name, inode number) entries. Linux/VFS assumes this model as well. |
540 | * Particularly, 'readdir()' call wants us to return a directory entry offset |
541 | * which later may be used to continue 'readdir()'ing the directory or to |
542 | * 'seek()' to that specific direntry. Obviously UBIFS does not really fit this |
543 | * model because directory entries are identified by keys, which may collide. |
544 | * |
545 | * UBIFS uses directory entry hash value for directory offsets, so |
546 | * 'seekdir()'/'telldir()' may not always work because of possible key |
547 | * collisions. But UBIFS guarantees that consecutive 'readdir()' calls work |
548 | * properly by means of saving full directory entry name in the private field |
549 | * of the file description object. |
550 | * |
551 | * This means that UBIFS cannot support NFS which requires full |
552 | * 'seekdir()'/'telldir()' support. |
553 | */ |
554 | static int ubifs_readdir(struct file *file, struct dir_context *ctx) |
555 | { |
556 | int fstr_real_len = 0, err = 0; |
557 | struct fscrypt_name nm; |
558 | struct fscrypt_str fstr = {0}; |
559 | union ubifs_key key; |
560 | struct ubifs_dent_node *dent; |
561 | struct inode *dir = file_inode(f: file); |
562 | struct ubifs_info *c = dir->i_sb->s_fs_info; |
563 | bool encrypted = IS_ENCRYPTED(dir); |
564 | |
565 | dbg_gen("dir ino %lu, f_pos %#llx" , dir->i_ino, ctx->pos); |
566 | |
567 | if (ctx->pos > UBIFS_S_KEY_HASH_MASK || ctx->pos == 2) |
568 | /* |
569 | * The directory was seek'ed to a senseless position or there |
570 | * are no more entries. |
571 | */ |
572 | return 0; |
573 | |
574 | if (encrypted) { |
575 | err = fscrypt_prepare_readdir(dir); |
576 | if (err) |
577 | return err; |
578 | |
579 | err = fscrypt_fname_alloc_buffer(UBIFS_MAX_NLEN, crypto_str: &fstr); |
580 | if (err) |
581 | return err; |
582 | |
583 | fstr_real_len = fstr.len; |
584 | } |
585 | |
586 | if (file->f_version == 0) { |
587 | /* |
588 | * The file was seek'ed, which means that @file->private_data |
589 | * is now invalid. This may also be just the first |
590 | * 'ubifs_readdir()' invocation, in which case |
591 | * @file->private_data is NULL, and the below code is |
592 | * basically a no-op. |
593 | */ |
594 | kfree(objp: file->private_data); |
595 | file->private_data = NULL; |
596 | } |
597 | |
598 | /* |
599 | * 'generic_file_llseek()' unconditionally sets @file->f_version to |
600 | * zero, and we use this for detecting whether the file was seek'ed. |
601 | */ |
602 | file->f_version = 1; |
603 | |
604 | /* File positions 0 and 1 correspond to "." and ".." */ |
605 | if (ctx->pos < 2) { |
606 | ubifs_assert(c, !file->private_data); |
607 | if (!dir_emit_dots(file, ctx)) { |
608 | if (encrypted) |
609 | fscrypt_fname_free_buffer(crypto_str: &fstr); |
610 | return 0; |
611 | } |
612 | |
613 | /* Find the first entry in TNC and save it */ |
614 | lowest_dent_key(c, key: &key, inum: dir->i_ino); |
615 | fname_len(&nm) = 0; |
616 | dent = ubifs_tnc_next_ent(c, key: &key, nm: &nm); |
617 | if (IS_ERR(ptr: dent)) { |
618 | err = PTR_ERR(ptr: dent); |
619 | goto out; |
620 | } |
621 | |
622 | ctx->pos = key_hash_flash(c, k: &dent->key); |
623 | file->private_data = dent; |
624 | } |
625 | |
626 | dent = file->private_data; |
627 | if (!dent) { |
628 | /* |
629 | * The directory was seek'ed to and is now readdir'ed. |
630 | * Find the entry corresponding to @ctx->pos or the closest one. |
631 | */ |
632 | dent_key_init_hash(c, key: &key, inum: dir->i_ino, hash: ctx->pos); |
633 | fname_len(&nm) = 0; |
634 | dent = ubifs_tnc_next_ent(c, key: &key, nm: &nm); |
635 | if (IS_ERR(ptr: dent)) { |
636 | err = PTR_ERR(ptr: dent); |
637 | goto out; |
638 | } |
639 | ctx->pos = key_hash_flash(c, k: &dent->key); |
640 | file->private_data = dent; |
641 | } |
642 | |
643 | while (1) { |
644 | dbg_gen("ino %llu, new f_pos %#x" , |
645 | (unsigned long long)le64_to_cpu(dent->inum), |
646 | key_hash_flash(c, &dent->key)); |
647 | ubifs_assert(c, le64_to_cpu(dent->ch.sqnum) > |
648 | ubifs_inode(dir)->creat_sqnum); |
649 | |
650 | fname_len(&nm) = le16_to_cpu(dent->nlen); |
651 | fname_name(&nm) = dent->name; |
652 | |
653 | if (encrypted) { |
654 | fstr.len = fstr_real_len; |
655 | |
656 | err = fscrypt_fname_disk_to_usr(inode: dir, hash: key_hash_flash(c, |
657 | k: &dent->key), |
658 | le32_to_cpu(dent->cookie), |
659 | iname: &nm.disk_name, oname: &fstr); |
660 | if (err) |
661 | goto out; |
662 | } else { |
663 | fstr.len = fname_len(&nm); |
664 | fstr.name = fname_name(&nm); |
665 | } |
666 | |
667 | if (!dir_emit(ctx, name: fstr.name, namelen: fstr.len, |
668 | le64_to_cpu(dent->inum), |
669 | type: vfs_dent_type(type: dent->type))) { |
670 | if (encrypted) |
671 | fscrypt_fname_free_buffer(crypto_str: &fstr); |
672 | return 0; |
673 | } |
674 | |
675 | /* Switch to the next entry */ |
676 | key_read(c, from: &dent->key, to: &key); |
677 | dent = ubifs_tnc_next_ent(c, key: &key, nm: &nm); |
678 | if (IS_ERR(ptr: dent)) { |
679 | err = PTR_ERR(ptr: dent); |
680 | goto out; |
681 | } |
682 | |
683 | kfree(objp: file->private_data); |
684 | ctx->pos = key_hash_flash(c, k: &dent->key); |
685 | file->private_data = dent; |
686 | cond_resched(); |
687 | } |
688 | |
689 | out: |
690 | kfree(objp: file->private_data); |
691 | file->private_data = NULL; |
692 | |
693 | if (encrypted) |
694 | fscrypt_fname_free_buffer(crypto_str: &fstr); |
695 | |
696 | if (err != -ENOENT) |
697 | ubifs_err(c, fmt: "cannot find next direntry, error %d" , err); |
698 | else |
699 | /* |
700 | * -ENOENT is a non-fatal error in this context, the TNC uses |
701 | * it to indicate that the cursor moved past the current directory |
702 | * and readdir() has to stop. |
703 | */ |
704 | err = 0; |
705 | |
706 | |
707 | /* 2 is a special value indicating that there are no more direntries */ |
708 | ctx->pos = 2; |
709 | return err; |
710 | } |
711 | |
712 | /* Free saved readdir() state when the directory is closed */ |
713 | static int ubifs_dir_release(struct inode *dir, struct file *file) |
714 | { |
715 | kfree(objp: file->private_data); |
716 | file->private_data = NULL; |
717 | return 0; |
718 | } |
719 | |
720 | static int ubifs_link(struct dentry *old_dentry, struct inode *dir, |
721 | struct dentry *dentry) |
722 | { |
723 | struct ubifs_info *c = dir->i_sb->s_fs_info; |
724 | struct inode *inode = d_inode(dentry: old_dentry); |
725 | struct ubifs_inode *ui = ubifs_inode(inode); |
726 | struct ubifs_inode *dir_ui = ubifs_inode(inode: dir); |
727 | int err, sz_change; |
728 | struct ubifs_budget_req req = { .new_dent = 1, .dirtied_ino = 2, |
729 | .dirtied_ino_d = ALIGN(ui->data_len, 8) }; |
730 | struct fscrypt_name nm; |
731 | |
732 | /* |
733 | * Budget request settings: new direntry, changing the target inode, |
734 | * changing the parent inode. |
735 | */ |
736 | |
737 | dbg_gen("dent '%pd' to ino %lu (nlink %d) in dir ino %lu" , |
738 | dentry, inode->i_ino, |
739 | inode->i_nlink, dir->i_ino); |
740 | ubifs_assert(c, inode_is_locked(dir)); |
741 | ubifs_assert(c, inode_is_locked(inode)); |
742 | |
743 | err = fscrypt_prepare_link(old_dentry, dir, dentry); |
744 | if (err) |
745 | return err; |
746 | |
747 | err = fscrypt_setup_filename(inode: dir, iname: &dentry->d_name, lookup: 0, fname: &nm); |
748 | if (err) |
749 | return err; |
750 | |
751 | sz_change = CALC_DENT_SIZE(fname_len(&nm)); |
752 | |
753 | err = dbg_check_synced_i_size(c, inode); |
754 | if (err) |
755 | goto out_fname; |
756 | |
757 | err = ubifs_budget_space(c, req: &req); |
758 | if (err) |
759 | goto out_fname; |
760 | |
761 | lock_2_inodes(inode1: dir, inode2: inode); |
762 | |
763 | /* Handle O_TMPFILE corner case, it is allowed to link a O_TMPFILE. */ |
764 | if (inode->i_nlink == 0) |
765 | ubifs_delete_orphan(c, inum: inode->i_ino); |
766 | |
767 | inc_nlink(inode); |
768 | ihold(inode); |
769 | inode_set_ctime_current(inode); |
770 | dir->i_size += sz_change; |
771 | dir_ui->ui_size = dir->i_size; |
772 | inode_set_mtime_to_ts(inode: dir, |
773 | ts: inode_set_ctime_to_ts(inode: dir, ts: inode_get_ctime(inode))); |
774 | err = ubifs_jnl_update(c, dir, nm: &nm, inode, deletion: 0, xent: 0); |
775 | if (err) |
776 | goto out_cancel; |
777 | unlock_2_inodes(inode1: dir, inode2: inode); |
778 | |
779 | ubifs_release_budget(c, req: &req); |
780 | d_instantiate(dentry, inode); |
781 | fscrypt_free_filename(fname: &nm); |
782 | return 0; |
783 | |
784 | out_cancel: |
785 | dir->i_size -= sz_change; |
786 | dir_ui->ui_size = dir->i_size; |
787 | drop_nlink(inode); |
788 | if (inode->i_nlink == 0) |
789 | ubifs_add_orphan(c, inum: inode->i_ino); |
790 | unlock_2_inodes(inode1: dir, inode2: inode); |
791 | ubifs_release_budget(c, req: &req); |
792 | iput(inode); |
793 | out_fname: |
794 | fscrypt_free_filename(fname: &nm); |
795 | return err; |
796 | } |
797 | |
798 | static int ubifs_unlink(struct inode *dir, struct dentry *dentry) |
799 | { |
800 | struct ubifs_info *c = dir->i_sb->s_fs_info; |
801 | struct inode *inode = d_inode(dentry); |
802 | struct ubifs_inode *dir_ui = ubifs_inode(inode: dir); |
803 | int err, sz_change, budgeted = 1; |
804 | struct ubifs_budget_req req = { .mod_dent = 1, .dirtied_ino = 2 }; |
805 | unsigned int saved_nlink = inode->i_nlink; |
806 | struct fscrypt_name nm; |
807 | |
808 | /* |
809 | * Budget request settings: deletion direntry, deletion inode (+1 for |
810 | * @dirtied_ino), changing the parent directory inode. If budgeting |
811 | * fails, go ahead anyway because we have extra space reserved for |
812 | * deletions. |
813 | */ |
814 | |
815 | dbg_gen("dent '%pd' from ino %lu (nlink %d) in dir ino %lu" , |
816 | dentry, inode->i_ino, |
817 | inode->i_nlink, dir->i_ino); |
818 | |
819 | err = fscrypt_setup_filename(inode: dir, iname: &dentry->d_name, lookup: 1, fname: &nm); |
820 | if (err) |
821 | return err; |
822 | |
823 | err = ubifs_purge_xattrs(host: inode); |
824 | if (err) |
825 | return err; |
826 | |
827 | sz_change = CALC_DENT_SIZE(fname_len(&nm)); |
828 | |
829 | ubifs_assert(c, inode_is_locked(dir)); |
830 | ubifs_assert(c, inode_is_locked(inode)); |
831 | err = dbg_check_synced_i_size(c, inode); |
832 | if (err) |
833 | goto out_fname; |
834 | |
835 | err = ubifs_budget_space(c, req: &req); |
836 | if (err) { |
837 | if (err != -ENOSPC) |
838 | goto out_fname; |
839 | budgeted = 0; |
840 | } |
841 | |
842 | lock_2_inodes(inode1: dir, inode2: inode); |
843 | inode_set_ctime_current(inode); |
844 | drop_nlink(inode); |
845 | dir->i_size -= sz_change; |
846 | dir_ui->ui_size = dir->i_size; |
847 | inode_set_mtime_to_ts(inode: dir, |
848 | ts: inode_set_ctime_to_ts(inode: dir, ts: inode_get_ctime(inode))); |
849 | err = ubifs_jnl_update(c, dir, nm: &nm, inode, deletion: 1, xent: 0); |
850 | if (err) |
851 | goto out_cancel; |
852 | unlock_2_inodes(inode1: dir, inode2: inode); |
853 | |
854 | if (budgeted) |
855 | ubifs_release_budget(c, req: &req); |
856 | else { |
857 | /* We've deleted something - clean the "no space" flags */ |
858 | c->bi.nospace = c->bi.nospace_rp = 0; |
859 | smp_wmb(); |
860 | } |
861 | fscrypt_free_filename(fname: &nm); |
862 | return 0; |
863 | |
864 | out_cancel: |
865 | dir->i_size += sz_change; |
866 | dir_ui->ui_size = dir->i_size; |
867 | set_nlink(inode, nlink: saved_nlink); |
868 | unlock_2_inodes(inode1: dir, inode2: inode); |
869 | if (budgeted) |
870 | ubifs_release_budget(c, req: &req); |
871 | out_fname: |
872 | fscrypt_free_filename(fname: &nm); |
873 | return err; |
874 | } |
875 | |
876 | /** |
877 | * ubifs_check_dir_empty - check if a directory is empty or not. |
878 | * @dir: VFS inode object of the directory to check |
879 | * |
880 | * This function checks if directory @dir is empty. Returns zero if the |
881 | * directory is empty, %-ENOTEMPTY if it is not, and other negative error codes |
882 | * in case of errors. |
883 | */ |
884 | int ubifs_check_dir_empty(struct inode *dir) |
885 | { |
886 | struct ubifs_info *c = dir->i_sb->s_fs_info; |
887 | struct fscrypt_name nm = { 0 }; |
888 | struct ubifs_dent_node *dent; |
889 | union ubifs_key key; |
890 | int err; |
891 | |
892 | lowest_dent_key(c, key: &key, inum: dir->i_ino); |
893 | dent = ubifs_tnc_next_ent(c, key: &key, nm: &nm); |
894 | if (IS_ERR(ptr: dent)) { |
895 | err = PTR_ERR(ptr: dent); |
896 | if (err == -ENOENT) |
897 | err = 0; |
898 | } else { |
899 | kfree(objp: dent); |
900 | err = -ENOTEMPTY; |
901 | } |
902 | return err; |
903 | } |
904 | |
905 | static int ubifs_rmdir(struct inode *dir, struct dentry *dentry) |
906 | { |
907 | struct ubifs_info *c = dir->i_sb->s_fs_info; |
908 | struct inode *inode = d_inode(dentry); |
909 | int err, sz_change, budgeted = 1; |
910 | struct ubifs_inode *dir_ui = ubifs_inode(inode: dir); |
911 | struct ubifs_budget_req req = { .mod_dent = 1, .dirtied_ino = 2 }; |
912 | struct fscrypt_name nm; |
913 | |
914 | /* |
915 | * Budget request settings: deletion direntry, deletion inode and |
916 | * changing the parent inode. If budgeting fails, go ahead anyway |
917 | * because we have extra space reserved for deletions. |
918 | */ |
919 | |
920 | dbg_gen("directory '%pd', ino %lu in dir ino %lu" , dentry, |
921 | inode->i_ino, dir->i_ino); |
922 | ubifs_assert(c, inode_is_locked(dir)); |
923 | ubifs_assert(c, inode_is_locked(inode)); |
924 | err = ubifs_check_dir_empty(dir: d_inode(dentry)); |
925 | if (err) |
926 | return err; |
927 | |
928 | err = fscrypt_setup_filename(inode: dir, iname: &dentry->d_name, lookup: 1, fname: &nm); |
929 | if (err) |
930 | return err; |
931 | |
932 | err = ubifs_purge_xattrs(host: inode); |
933 | if (err) |
934 | return err; |
935 | |
936 | sz_change = CALC_DENT_SIZE(fname_len(&nm)); |
937 | |
938 | err = ubifs_budget_space(c, req: &req); |
939 | if (err) { |
940 | if (err != -ENOSPC) |
941 | goto out_fname; |
942 | budgeted = 0; |
943 | } |
944 | |
945 | lock_2_inodes(inode1: dir, inode2: inode); |
946 | inode_set_ctime_current(inode); |
947 | clear_nlink(inode); |
948 | drop_nlink(inode: dir); |
949 | dir->i_size -= sz_change; |
950 | dir_ui->ui_size = dir->i_size; |
951 | inode_set_mtime_to_ts(inode: dir, |
952 | ts: inode_set_ctime_to_ts(inode: dir, ts: inode_get_ctime(inode))); |
953 | err = ubifs_jnl_update(c, dir, nm: &nm, inode, deletion: 1, xent: 0); |
954 | if (err) |
955 | goto out_cancel; |
956 | unlock_2_inodes(inode1: dir, inode2: inode); |
957 | |
958 | if (budgeted) |
959 | ubifs_release_budget(c, req: &req); |
960 | else { |
961 | /* We've deleted something - clean the "no space" flags */ |
962 | c->bi.nospace = c->bi.nospace_rp = 0; |
963 | smp_wmb(); |
964 | } |
965 | fscrypt_free_filename(fname: &nm); |
966 | return 0; |
967 | |
968 | out_cancel: |
969 | dir->i_size += sz_change; |
970 | dir_ui->ui_size = dir->i_size; |
971 | inc_nlink(inode: dir); |
972 | set_nlink(inode, nlink: 2); |
973 | unlock_2_inodes(inode1: dir, inode2: inode); |
974 | if (budgeted) |
975 | ubifs_release_budget(c, req: &req); |
976 | out_fname: |
977 | fscrypt_free_filename(fname: &nm); |
978 | return err; |
979 | } |
980 | |
981 | static int ubifs_mkdir(struct mnt_idmap *idmap, struct inode *dir, |
982 | struct dentry *dentry, umode_t mode) |
983 | { |
984 | struct inode *inode; |
985 | struct ubifs_inode *dir_ui = ubifs_inode(inode: dir); |
986 | struct ubifs_info *c = dir->i_sb->s_fs_info; |
987 | int err, sz_change; |
988 | struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1, |
989 | .dirtied_ino = 1}; |
990 | struct fscrypt_name nm; |
991 | |
992 | /* |
993 | * Budget request settings: new inode, new direntry and changing parent |
994 | * directory inode. |
995 | */ |
996 | |
997 | dbg_gen("dent '%pd', mode %#hx in dir ino %lu" , |
998 | dentry, mode, dir->i_ino); |
999 | |
1000 | err = ubifs_budget_space(c, req: &req); |
1001 | if (err) |
1002 | return err; |
1003 | |
1004 | err = ubifs_prepare_create(dir, dentry, nm: &nm); |
1005 | if (err) |
1006 | goto out_budg; |
1007 | |
1008 | sz_change = CALC_DENT_SIZE(fname_len(&nm)); |
1009 | |
1010 | inode = ubifs_new_inode(c, dir, S_IFDIR | mode, is_xattr: false); |
1011 | if (IS_ERR(ptr: inode)) { |
1012 | err = PTR_ERR(ptr: inode); |
1013 | goto out_fname; |
1014 | } |
1015 | |
1016 | err = ubifs_init_security(dentry: dir, inode, qstr: &dentry->d_name); |
1017 | if (err) |
1018 | goto out_inode; |
1019 | |
1020 | mutex_lock(&dir_ui->ui_mutex); |
1021 | insert_inode_hash(inode); |
1022 | inc_nlink(inode); |
1023 | inc_nlink(inode: dir); |
1024 | dir->i_size += sz_change; |
1025 | dir_ui->ui_size = dir->i_size; |
1026 | inode_set_mtime_to_ts(inode: dir, |
1027 | ts: inode_set_ctime_to_ts(inode: dir, ts: inode_get_ctime(inode))); |
1028 | err = ubifs_jnl_update(c, dir, nm: &nm, inode, deletion: 0, xent: 0); |
1029 | if (err) { |
1030 | ubifs_err(c, fmt: "cannot create directory, error %d" , err); |
1031 | goto out_cancel; |
1032 | } |
1033 | mutex_unlock(lock: &dir_ui->ui_mutex); |
1034 | |
1035 | ubifs_release_budget(c, req: &req); |
1036 | d_instantiate(dentry, inode); |
1037 | fscrypt_free_filename(fname: &nm); |
1038 | return 0; |
1039 | |
1040 | out_cancel: |
1041 | dir->i_size -= sz_change; |
1042 | dir_ui->ui_size = dir->i_size; |
1043 | drop_nlink(inode: dir); |
1044 | mutex_unlock(lock: &dir_ui->ui_mutex); |
1045 | out_inode: |
1046 | make_bad_inode(inode); |
1047 | iput(inode); |
1048 | out_fname: |
1049 | fscrypt_free_filename(fname: &nm); |
1050 | out_budg: |
1051 | ubifs_release_budget(c, req: &req); |
1052 | return err; |
1053 | } |
1054 | |
1055 | static int ubifs_mknod(struct mnt_idmap *idmap, struct inode *dir, |
1056 | struct dentry *dentry, umode_t mode, dev_t rdev) |
1057 | { |
1058 | struct inode *inode; |
1059 | struct ubifs_inode *ui; |
1060 | struct ubifs_inode *dir_ui = ubifs_inode(inode: dir); |
1061 | struct ubifs_info *c = dir->i_sb->s_fs_info; |
1062 | union ubifs_dev_desc *dev = NULL; |
1063 | int sz_change; |
1064 | int err, devlen = 0; |
1065 | struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1, |
1066 | .dirtied_ino = 1 }; |
1067 | struct fscrypt_name nm; |
1068 | |
1069 | /* |
1070 | * Budget request settings: new inode, new direntry and changing parent |
1071 | * directory inode. |
1072 | */ |
1073 | |
1074 | dbg_gen("dent '%pd' in dir ino %lu" , dentry, dir->i_ino); |
1075 | |
1076 | if (S_ISBLK(mode) || S_ISCHR(mode)) { |
1077 | dev = kmalloc(size: sizeof(union ubifs_dev_desc), GFP_NOFS); |
1078 | if (!dev) |
1079 | return -ENOMEM; |
1080 | devlen = ubifs_encode_dev(dev, rdev); |
1081 | } |
1082 | |
1083 | req.new_ino_d = ALIGN(devlen, 8); |
1084 | err = ubifs_budget_space(c, req: &req); |
1085 | if (err) { |
1086 | kfree(objp: dev); |
1087 | return err; |
1088 | } |
1089 | |
1090 | err = ubifs_prepare_create(dir, dentry, nm: &nm); |
1091 | if (err) { |
1092 | kfree(objp: dev); |
1093 | goto out_budg; |
1094 | } |
1095 | |
1096 | sz_change = CALC_DENT_SIZE(fname_len(&nm)); |
1097 | |
1098 | inode = ubifs_new_inode(c, dir, mode, is_xattr: false); |
1099 | if (IS_ERR(ptr: inode)) { |
1100 | kfree(objp: dev); |
1101 | err = PTR_ERR(ptr: inode); |
1102 | goto out_fname; |
1103 | } |
1104 | |
1105 | init_special_inode(inode, inode->i_mode, rdev); |
1106 | inode->i_size = ubifs_inode(inode)->ui_size = devlen; |
1107 | ui = ubifs_inode(inode); |
1108 | ui->data = dev; |
1109 | ui->data_len = devlen; |
1110 | |
1111 | err = ubifs_init_security(dentry: dir, inode, qstr: &dentry->d_name); |
1112 | if (err) |
1113 | goto out_inode; |
1114 | |
1115 | mutex_lock(&dir_ui->ui_mutex); |
1116 | dir->i_size += sz_change; |
1117 | dir_ui->ui_size = dir->i_size; |
1118 | inode_set_mtime_to_ts(inode: dir, |
1119 | ts: inode_set_ctime_to_ts(inode: dir, ts: inode_get_ctime(inode))); |
1120 | err = ubifs_jnl_update(c, dir, nm: &nm, inode, deletion: 0, xent: 0); |
1121 | if (err) |
1122 | goto out_cancel; |
1123 | mutex_unlock(lock: &dir_ui->ui_mutex); |
1124 | |
1125 | ubifs_release_budget(c, req: &req); |
1126 | insert_inode_hash(inode); |
1127 | d_instantiate(dentry, inode); |
1128 | fscrypt_free_filename(fname: &nm); |
1129 | return 0; |
1130 | |
1131 | out_cancel: |
1132 | dir->i_size -= sz_change; |
1133 | dir_ui->ui_size = dir->i_size; |
1134 | mutex_unlock(lock: &dir_ui->ui_mutex); |
1135 | out_inode: |
1136 | /* Free inode->i_link before inode is marked as bad. */ |
1137 | fscrypt_free_inode(inode); |
1138 | make_bad_inode(inode); |
1139 | iput(inode); |
1140 | out_fname: |
1141 | fscrypt_free_filename(fname: &nm); |
1142 | out_budg: |
1143 | ubifs_release_budget(c, req: &req); |
1144 | return err; |
1145 | } |
1146 | |
1147 | static int ubifs_symlink(struct mnt_idmap *idmap, struct inode *dir, |
1148 | struct dentry *dentry, const char *symname) |
1149 | { |
1150 | struct inode *inode; |
1151 | struct ubifs_inode *ui; |
1152 | struct ubifs_inode *dir_ui = ubifs_inode(inode: dir); |
1153 | struct ubifs_info *c = dir->i_sb->s_fs_info; |
1154 | int err, sz_change, len = strlen(symname); |
1155 | struct fscrypt_str disk_link; |
1156 | struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1, |
1157 | .dirtied_ino = 1 }; |
1158 | struct fscrypt_name nm; |
1159 | |
1160 | dbg_gen("dent '%pd', target '%s' in dir ino %lu" , dentry, |
1161 | symname, dir->i_ino); |
1162 | |
1163 | err = fscrypt_prepare_symlink(dir, target: symname, len, UBIFS_MAX_INO_DATA, |
1164 | disk_link: &disk_link); |
1165 | if (err) |
1166 | return err; |
1167 | |
1168 | /* |
1169 | * Budget request settings: new inode, new direntry and changing parent |
1170 | * directory inode. |
1171 | */ |
1172 | req.new_ino_d = ALIGN(disk_link.len - 1, 8); |
1173 | err = ubifs_budget_space(c, req: &req); |
1174 | if (err) |
1175 | return err; |
1176 | |
1177 | err = ubifs_prepare_create(dir, dentry, nm: &nm); |
1178 | if (err) |
1179 | goto out_budg; |
1180 | |
1181 | sz_change = CALC_DENT_SIZE(fname_len(&nm)); |
1182 | |
1183 | inode = ubifs_new_inode(c, dir, S_IFLNK | S_IRWXUGO, is_xattr: false); |
1184 | if (IS_ERR(ptr: inode)) { |
1185 | err = PTR_ERR(ptr: inode); |
1186 | goto out_fname; |
1187 | } |
1188 | |
1189 | ui = ubifs_inode(inode); |
1190 | ui->data = kmalloc(size: disk_link.len, GFP_NOFS); |
1191 | if (!ui->data) { |
1192 | err = -ENOMEM; |
1193 | goto out_inode; |
1194 | } |
1195 | |
1196 | if (IS_ENCRYPTED(inode)) { |
1197 | disk_link.name = ui->data; /* encrypt directly into ui->data */ |
1198 | err = fscrypt_encrypt_symlink(inode, target: symname, len, disk_link: &disk_link); |
1199 | if (err) |
1200 | goto out_inode; |
1201 | } else { |
1202 | memcpy(ui->data, disk_link.name, disk_link.len); |
1203 | inode->i_link = ui->data; |
1204 | } |
1205 | |
1206 | /* |
1207 | * The terminating zero byte is not written to the flash media and it |
1208 | * is put just to make later in-memory string processing simpler. Thus, |
1209 | * data length is @disk_link.len - 1, not @disk_link.len. |
1210 | */ |
1211 | ui->data_len = disk_link.len - 1; |
1212 | inode->i_size = ubifs_inode(inode)->ui_size = disk_link.len - 1; |
1213 | |
1214 | err = ubifs_init_security(dentry: dir, inode, qstr: &dentry->d_name); |
1215 | if (err) |
1216 | goto out_inode; |
1217 | |
1218 | mutex_lock(&dir_ui->ui_mutex); |
1219 | dir->i_size += sz_change; |
1220 | dir_ui->ui_size = dir->i_size; |
1221 | inode_set_mtime_to_ts(inode: dir, |
1222 | ts: inode_set_ctime_to_ts(inode: dir, ts: inode_get_ctime(inode))); |
1223 | err = ubifs_jnl_update(c, dir, nm: &nm, inode, deletion: 0, xent: 0); |
1224 | if (err) |
1225 | goto out_cancel; |
1226 | mutex_unlock(lock: &dir_ui->ui_mutex); |
1227 | |
1228 | insert_inode_hash(inode); |
1229 | d_instantiate(dentry, inode); |
1230 | err = 0; |
1231 | goto out_fname; |
1232 | |
1233 | out_cancel: |
1234 | dir->i_size -= sz_change; |
1235 | dir_ui->ui_size = dir->i_size; |
1236 | mutex_unlock(lock: &dir_ui->ui_mutex); |
1237 | out_inode: |
1238 | /* Free inode->i_link before inode is marked as bad. */ |
1239 | fscrypt_free_inode(inode); |
1240 | make_bad_inode(inode); |
1241 | iput(inode); |
1242 | out_fname: |
1243 | fscrypt_free_filename(fname: &nm); |
1244 | out_budg: |
1245 | ubifs_release_budget(c, req: &req); |
1246 | return err; |
1247 | } |
1248 | |
1249 | /** |
1250 | * lock_4_inodes - a wrapper for locking three UBIFS inodes. |
1251 | * @inode1: first inode |
1252 | * @inode2: second inode |
1253 | * @inode3: third inode |
1254 | * @inode4: fourth inode |
1255 | * |
1256 | * This function is used for 'ubifs_rename()' and @inode1 may be the same as |
1257 | * @inode2 whereas @inode3 and @inode4 may be %NULL. |
1258 | * |
1259 | * We do not implement any tricks to guarantee strict lock ordering, because |
1260 | * VFS has already done it for us on the @i_mutex. So this is just a simple |
1261 | * wrapper function. |
1262 | */ |
1263 | static void lock_4_inodes(struct inode *inode1, struct inode *inode2, |
1264 | struct inode *inode3, struct inode *inode4) |
1265 | { |
1266 | mutex_lock_nested(lock: &ubifs_inode(inode: inode1)->ui_mutex, subclass: WB_MUTEX_1); |
1267 | if (inode2 != inode1) |
1268 | mutex_lock_nested(lock: &ubifs_inode(inode: inode2)->ui_mutex, subclass: WB_MUTEX_2); |
1269 | if (inode3) |
1270 | mutex_lock_nested(lock: &ubifs_inode(inode: inode3)->ui_mutex, subclass: WB_MUTEX_3); |
1271 | if (inode4) |
1272 | mutex_lock_nested(lock: &ubifs_inode(inode: inode4)->ui_mutex, subclass: WB_MUTEX_4); |
1273 | } |
1274 | |
1275 | /** |
1276 | * unlock_4_inodes - a wrapper for unlocking three UBIFS inodes for rename. |
1277 | * @inode1: first inode |
1278 | * @inode2: second inode |
1279 | * @inode3: third inode |
1280 | * @inode4: fourth inode |
1281 | */ |
1282 | static void unlock_4_inodes(struct inode *inode1, struct inode *inode2, |
1283 | struct inode *inode3, struct inode *inode4) |
1284 | { |
1285 | if (inode4) |
1286 | mutex_unlock(lock: &ubifs_inode(inode: inode4)->ui_mutex); |
1287 | if (inode3) |
1288 | mutex_unlock(lock: &ubifs_inode(inode: inode3)->ui_mutex); |
1289 | if (inode1 != inode2) |
1290 | mutex_unlock(lock: &ubifs_inode(inode: inode2)->ui_mutex); |
1291 | mutex_unlock(lock: &ubifs_inode(inode: inode1)->ui_mutex); |
1292 | } |
1293 | |
1294 | static int do_rename(struct inode *old_dir, struct dentry *old_dentry, |
1295 | struct inode *new_dir, struct dentry *new_dentry, |
1296 | unsigned int flags) |
1297 | { |
1298 | struct ubifs_info *c = old_dir->i_sb->s_fs_info; |
1299 | struct inode *old_inode = d_inode(dentry: old_dentry); |
1300 | struct inode *new_inode = d_inode(dentry: new_dentry); |
1301 | struct inode *whiteout = NULL; |
1302 | struct ubifs_inode *old_inode_ui = ubifs_inode(inode: old_inode); |
1303 | struct ubifs_inode *whiteout_ui = NULL; |
1304 | int err, release, sync = 0, move = (new_dir != old_dir); |
1305 | int is_dir = S_ISDIR(old_inode->i_mode); |
1306 | int unlink = !!new_inode, new_sz, old_sz; |
1307 | struct ubifs_budget_req req = { .new_dent = 1, .mod_dent = 1, |
1308 | .dirtied_ino = 3 }; |
1309 | struct ubifs_budget_req ino_req = { .dirtied_ino = 1, |
1310 | .dirtied_ino_d = ALIGN(old_inode_ui->data_len, 8) }; |
1311 | struct ubifs_budget_req wht_req; |
1312 | unsigned int saved_nlink; |
1313 | struct fscrypt_name old_nm, new_nm; |
1314 | |
1315 | /* |
1316 | * Budget request settings: |
1317 | * req: deletion direntry, new direntry, removing the old inode, |
1318 | * and changing old and new parent directory inodes. |
1319 | * |
1320 | * wht_req: new whiteout inode for RENAME_WHITEOUT. |
1321 | * |
1322 | * ino_req: marks the target inode as dirty and does not write it. |
1323 | */ |
1324 | |
1325 | dbg_gen("dent '%pd' ino %lu in dir ino %lu to dent '%pd' in dir ino %lu flags 0x%x" , |
1326 | old_dentry, old_inode->i_ino, old_dir->i_ino, |
1327 | new_dentry, new_dir->i_ino, flags); |
1328 | |
1329 | if (unlink) { |
1330 | ubifs_assert(c, inode_is_locked(new_inode)); |
1331 | |
1332 | /* Budget for old inode's data when its nlink > 1. */ |
1333 | req.dirtied_ino_d = ALIGN(ubifs_inode(new_inode)->data_len, 8); |
1334 | err = ubifs_purge_xattrs(host: new_inode); |
1335 | if (err) |
1336 | return err; |
1337 | } |
1338 | |
1339 | if (unlink && is_dir) { |
1340 | err = ubifs_check_dir_empty(dir: new_inode); |
1341 | if (err) |
1342 | return err; |
1343 | } |
1344 | |
1345 | err = fscrypt_setup_filename(inode: old_dir, iname: &old_dentry->d_name, lookup: 0, fname: &old_nm); |
1346 | if (err) |
1347 | return err; |
1348 | |
1349 | err = fscrypt_setup_filename(inode: new_dir, iname: &new_dentry->d_name, lookup: 0, fname: &new_nm); |
1350 | if (err) { |
1351 | fscrypt_free_filename(fname: &old_nm); |
1352 | return err; |
1353 | } |
1354 | |
1355 | new_sz = CALC_DENT_SIZE(fname_len(&new_nm)); |
1356 | old_sz = CALC_DENT_SIZE(fname_len(&old_nm)); |
1357 | |
1358 | err = ubifs_budget_space(c, req: &req); |
1359 | if (err) { |
1360 | fscrypt_free_filename(fname: &old_nm); |
1361 | fscrypt_free_filename(fname: &new_nm); |
1362 | return err; |
1363 | } |
1364 | err = ubifs_budget_space(c, req: &ino_req); |
1365 | if (err) { |
1366 | fscrypt_free_filename(fname: &old_nm); |
1367 | fscrypt_free_filename(fname: &new_nm); |
1368 | ubifs_release_budget(c, req: &req); |
1369 | return err; |
1370 | } |
1371 | |
1372 | if (flags & RENAME_WHITEOUT) { |
1373 | union ubifs_dev_desc *dev = NULL; |
1374 | |
1375 | dev = kmalloc(size: sizeof(union ubifs_dev_desc), GFP_NOFS); |
1376 | if (!dev) { |
1377 | err = -ENOMEM; |
1378 | goto out_release; |
1379 | } |
1380 | |
1381 | /* |
1382 | * The whiteout inode without dentry is pinned in memory, |
1383 | * umount won't happen during rename process because we |
1384 | * got parent dentry. |
1385 | */ |
1386 | whiteout = create_whiteout(dir: old_dir, dentry: old_dentry); |
1387 | if (IS_ERR(ptr: whiteout)) { |
1388 | err = PTR_ERR(ptr: whiteout); |
1389 | kfree(objp: dev); |
1390 | goto out_release; |
1391 | } |
1392 | |
1393 | whiteout_ui = ubifs_inode(inode: whiteout); |
1394 | whiteout_ui->data = dev; |
1395 | whiteout_ui->data_len = ubifs_encode_dev(dev, MKDEV(0, 0)); |
1396 | ubifs_assert(c, !whiteout_ui->dirty); |
1397 | |
1398 | memset(&wht_req, 0, sizeof(struct ubifs_budget_req)); |
1399 | wht_req.new_ino = 1; |
1400 | wht_req.new_ino_d = ALIGN(whiteout_ui->data_len, 8); |
1401 | /* |
1402 | * To avoid deadlock between space budget (holds ui_mutex and |
1403 | * waits wb work) and writeback work(waits ui_mutex), do space |
1404 | * budget before ubifs inodes locked. |
1405 | */ |
1406 | err = ubifs_budget_space(c, req: &wht_req); |
1407 | if (err) { |
1408 | /* |
1409 | * Whiteout inode can not be written on flash by |
1410 | * ubifs_jnl_write_inode(), because it's neither |
1411 | * dirty nor zero-nlink. |
1412 | */ |
1413 | iput(whiteout); |
1414 | goto out_release; |
1415 | } |
1416 | |
1417 | /* Add the old_dentry size to the old_dir size. */ |
1418 | old_sz -= CALC_DENT_SIZE(fname_len(&old_nm)); |
1419 | } |
1420 | |
1421 | lock_4_inodes(inode1: old_dir, inode2: new_dir, inode3: new_inode, inode4: whiteout); |
1422 | |
1423 | /* |
1424 | * Like most other Unix systems, set the @i_ctime for inodes on a |
1425 | * rename. |
1426 | */ |
1427 | simple_rename_timestamp(old_dir, old_dentry, new_dir, new_dentry); |
1428 | |
1429 | /* We must adjust parent link count when renaming directories */ |
1430 | if (is_dir) { |
1431 | if (move) { |
1432 | /* |
1433 | * @old_dir loses a link because we are moving |
1434 | * @old_inode to a different directory. |
1435 | */ |
1436 | drop_nlink(inode: old_dir); |
1437 | /* |
1438 | * @new_dir only gains a link if we are not also |
1439 | * overwriting an existing directory. |
1440 | */ |
1441 | if (!unlink) |
1442 | inc_nlink(inode: new_dir); |
1443 | } else { |
1444 | /* |
1445 | * @old_inode is not moving to a different directory, |
1446 | * but @old_dir still loses a link if we are |
1447 | * overwriting an existing directory. |
1448 | */ |
1449 | if (unlink) |
1450 | drop_nlink(inode: old_dir); |
1451 | } |
1452 | } |
1453 | |
1454 | old_dir->i_size -= old_sz; |
1455 | ubifs_inode(inode: old_dir)->ui_size = old_dir->i_size; |
1456 | |
1457 | /* |
1458 | * And finally, if we unlinked a direntry which happened to have the |
1459 | * same name as the moved direntry, we have to decrement @i_nlink of |
1460 | * the unlinked inode. |
1461 | */ |
1462 | if (unlink) { |
1463 | /* |
1464 | * Directories cannot have hard-links, so if this is a |
1465 | * directory, just clear @i_nlink. |
1466 | */ |
1467 | saved_nlink = new_inode->i_nlink; |
1468 | if (is_dir) |
1469 | clear_nlink(inode: new_inode); |
1470 | else |
1471 | drop_nlink(inode: new_inode); |
1472 | } else { |
1473 | new_dir->i_size += new_sz; |
1474 | ubifs_inode(inode: new_dir)->ui_size = new_dir->i_size; |
1475 | } |
1476 | |
1477 | /* |
1478 | * Do not ask 'ubifs_jnl_rename()' to flush write-buffer if @old_inode |
1479 | * is dirty, because this will be done later on at the end of |
1480 | * 'ubifs_rename()'. |
1481 | */ |
1482 | if (IS_SYNC(old_inode)) { |
1483 | sync = IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir); |
1484 | if (unlink && IS_SYNC(new_inode)) |
1485 | sync = 1; |
1486 | /* |
1487 | * S_SYNC flag of whiteout inherits from the old_dir, and we |
1488 | * have already checked the old dir inode. So there is no need |
1489 | * to check whiteout. |
1490 | */ |
1491 | } |
1492 | |
1493 | err = ubifs_jnl_rename(c, old_dir, old_inode, old_nm: &old_nm, new_dir, |
1494 | new_inode, new_nm: &new_nm, whiteout, sync); |
1495 | if (err) |
1496 | goto out_cancel; |
1497 | |
1498 | unlock_4_inodes(inode1: old_dir, inode2: new_dir, inode3: new_inode, inode4: whiteout); |
1499 | ubifs_release_budget(c, req: &req); |
1500 | |
1501 | if (whiteout) { |
1502 | ubifs_release_budget(c, req: &wht_req); |
1503 | iput(whiteout); |
1504 | } |
1505 | |
1506 | mutex_lock(&old_inode_ui->ui_mutex); |
1507 | release = old_inode_ui->dirty; |
1508 | mark_inode_dirty_sync(inode: old_inode); |
1509 | mutex_unlock(lock: &old_inode_ui->ui_mutex); |
1510 | |
1511 | if (release) |
1512 | ubifs_release_budget(c, req: &ino_req); |
1513 | if (IS_SYNC(old_inode)) |
1514 | /* |
1515 | * Rename finished here. Although old inode cannot be updated |
1516 | * on flash, old ctime is not a big problem, don't return err |
1517 | * code to userspace. |
1518 | */ |
1519 | old_inode->i_sb->s_op->write_inode(old_inode, NULL); |
1520 | |
1521 | fscrypt_free_filename(fname: &old_nm); |
1522 | fscrypt_free_filename(fname: &new_nm); |
1523 | return 0; |
1524 | |
1525 | out_cancel: |
1526 | if (unlink) { |
1527 | set_nlink(inode: new_inode, nlink: saved_nlink); |
1528 | } else { |
1529 | new_dir->i_size -= new_sz; |
1530 | ubifs_inode(inode: new_dir)->ui_size = new_dir->i_size; |
1531 | } |
1532 | old_dir->i_size += old_sz; |
1533 | ubifs_inode(inode: old_dir)->ui_size = old_dir->i_size; |
1534 | if (is_dir) { |
1535 | if (move) { |
1536 | inc_nlink(inode: old_dir); |
1537 | if (!unlink) |
1538 | drop_nlink(inode: new_dir); |
1539 | } else { |
1540 | if (unlink) |
1541 | inc_nlink(inode: old_dir); |
1542 | } |
1543 | } |
1544 | unlock_4_inodes(inode1: old_dir, inode2: new_dir, inode3: new_inode, inode4: whiteout); |
1545 | if (whiteout) { |
1546 | ubifs_release_budget(c, req: &wht_req); |
1547 | iput(whiteout); |
1548 | } |
1549 | out_release: |
1550 | ubifs_release_budget(c, req: &ino_req); |
1551 | ubifs_release_budget(c, req: &req); |
1552 | fscrypt_free_filename(fname: &old_nm); |
1553 | fscrypt_free_filename(fname: &new_nm); |
1554 | return err; |
1555 | } |
1556 | |
1557 | static int ubifs_xrename(struct inode *old_dir, struct dentry *old_dentry, |
1558 | struct inode *new_dir, struct dentry *new_dentry) |
1559 | { |
1560 | struct ubifs_info *c = old_dir->i_sb->s_fs_info; |
1561 | struct ubifs_budget_req req = { .new_dent = 1, .mod_dent = 1, |
1562 | .dirtied_ino = 2 }; |
1563 | int sync = IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir); |
1564 | struct inode *fst_inode = d_inode(dentry: old_dentry); |
1565 | struct inode *snd_inode = d_inode(dentry: new_dentry); |
1566 | int err; |
1567 | struct fscrypt_name fst_nm, snd_nm; |
1568 | |
1569 | ubifs_assert(c, fst_inode && snd_inode); |
1570 | |
1571 | /* |
1572 | * Budget request settings: changing two direntries, changing the two |
1573 | * parent directory inodes. |
1574 | */ |
1575 | |
1576 | dbg_gen("dent '%pd' ino %lu in dir ino %lu exchange dent '%pd' ino %lu in dir ino %lu" , |
1577 | old_dentry, fst_inode->i_ino, old_dir->i_ino, |
1578 | new_dentry, snd_inode->i_ino, new_dir->i_ino); |
1579 | |
1580 | err = fscrypt_setup_filename(inode: old_dir, iname: &old_dentry->d_name, lookup: 0, fname: &fst_nm); |
1581 | if (err) |
1582 | return err; |
1583 | |
1584 | err = fscrypt_setup_filename(inode: new_dir, iname: &new_dentry->d_name, lookup: 0, fname: &snd_nm); |
1585 | if (err) { |
1586 | fscrypt_free_filename(fname: &fst_nm); |
1587 | return err; |
1588 | } |
1589 | |
1590 | err = ubifs_budget_space(c, req: &req); |
1591 | if (err) |
1592 | goto out; |
1593 | |
1594 | lock_4_inodes(inode1: old_dir, inode2: new_dir, NULL, NULL); |
1595 | |
1596 | simple_rename_timestamp(old_dir, old_dentry, new_dir, new_dentry); |
1597 | |
1598 | if (old_dir != new_dir) { |
1599 | if (S_ISDIR(fst_inode->i_mode) && !S_ISDIR(snd_inode->i_mode)) { |
1600 | inc_nlink(inode: new_dir); |
1601 | drop_nlink(inode: old_dir); |
1602 | } |
1603 | else if (!S_ISDIR(fst_inode->i_mode) && S_ISDIR(snd_inode->i_mode)) { |
1604 | drop_nlink(inode: new_dir); |
1605 | inc_nlink(inode: old_dir); |
1606 | } |
1607 | } |
1608 | |
1609 | err = ubifs_jnl_xrename(c, fst_dir: old_dir, fst_inode, fst_nm: &fst_nm, snd_dir: new_dir, |
1610 | snd_inode, snd_nm: &snd_nm, sync); |
1611 | |
1612 | unlock_4_inodes(inode1: old_dir, inode2: new_dir, NULL, NULL); |
1613 | ubifs_release_budget(c, req: &req); |
1614 | |
1615 | out: |
1616 | fscrypt_free_filename(fname: &fst_nm); |
1617 | fscrypt_free_filename(fname: &snd_nm); |
1618 | return err; |
1619 | } |
1620 | |
1621 | static int ubifs_rename(struct mnt_idmap *idmap, |
1622 | struct inode *old_dir, struct dentry *old_dentry, |
1623 | struct inode *new_dir, struct dentry *new_dentry, |
1624 | unsigned int flags) |
1625 | { |
1626 | int err; |
1627 | struct ubifs_info *c = old_dir->i_sb->s_fs_info; |
1628 | |
1629 | if (flags & ~(RENAME_NOREPLACE | RENAME_WHITEOUT | RENAME_EXCHANGE)) |
1630 | return -EINVAL; |
1631 | |
1632 | ubifs_assert(c, inode_is_locked(old_dir)); |
1633 | ubifs_assert(c, inode_is_locked(new_dir)); |
1634 | |
1635 | err = fscrypt_prepare_rename(old_dir, old_dentry, new_dir, new_dentry, |
1636 | flags); |
1637 | if (err) |
1638 | return err; |
1639 | |
1640 | if (flags & RENAME_EXCHANGE) |
1641 | return ubifs_xrename(old_dir, old_dentry, new_dir, new_dentry); |
1642 | |
1643 | return do_rename(old_dir, old_dentry, new_dir, new_dentry, flags); |
1644 | } |
1645 | |
1646 | int ubifs_getattr(struct mnt_idmap *idmap, const struct path *path, |
1647 | struct kstat *stat, u32 request_mask, unsigned int flags) |
1648 | { |
1649 | loff_t size; |
1650 | struct inode *inode = d_inode(dentry: path->dentry); |
1651 | struct ubifs_inode *ui = ubifs_inode(inode); |
1652 | |
1653 | mutex_lock(&ui->ui_mutex); |
1654 | |
1655 | if (ui->flags & UBIFS_APPEND_FL) |
1656 | stat->attributes |= STATX_ATTR_APPEND; |
1657 | if (ui->flags & UBIFS_COMPR_FL) |
1658 | stat->attributes |= STATX_ATTR_COMPRESSED; |
1659 | if (ui->flags & UBIFS_CRYPT_FL) |
1660 | stat->attributes |= STATX_ATTR_ENCRYPTED; |
1661 | if (ui->flags & UBIFS_IMMUTABLE_FL) |
1662 | stat->attributes |= STATX_ATTR_IMMUTABLE; |
1663 | |
1664 | stat->attributes_mask |= (STATX_ATTR_APPEND | |
1665 | STATX_ATTR_COMPRESSED | |
1666 | STATX_ATTR_ENCRYPTED | |
1667 | STATX_ATTR_IMMUTABLE); |
1668 | |
1669 | generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat); |
1670 | stat->blksize = UBIFS_BLOCK_SIZE; |
1671 | stat->size = ui->ui_size; |
1672 | |
1673 | /* |
1674 | * Unfortunately, the 'stat()' system call was designed for block |
1675 | * device based file systems, and it is not appropriate for UBIFS, |
1676 | * because UBIFS does not have notion of "block". For example, it is |
1677 | * difficult to tell how many block a directory takes - it actually |
1678 | * takes less than 300 bytes, but we have to round it to block size, |
1679 | * which introduces large mistake. This makes utilities like 'du' to |
1680 | * report completely senseless numbers. This is the reason why UBIFS |
1681 | * goes the same way as JFFS2 - it reports zero blocks for everything |
1682 | * but regular files, which makes more sense than reporting completely |
1683 | * wrong sizes. |
1684 | */ |
1685 | if (S_ISREG(inode->i_mode)) { |
1686 | size = ui->xattr_size; |
1687 | size += stat->size; |
1688 | size = ALIGN(size, UBIFS_BLOCK_SIZE); |
1689 | /* |
1690 | * Note, user-space expects 512-byte blocks count irrespectively |
1691 | * of what was reported in @stat->size. |
1692 | */ |
1693 | stat->blocks = size >> 9; |
1694 | } else |
1695 | stat->blocks = 0; |
1696 | mutex_unlock(lock: &ui->ui_mutex); |
1697 | return 0; |
1698 | } |
1699 | |
1700 | const struct inode_operations ubifs_dir_inode_operations = { |
1701 | .lookup = ubifs_lookup, |
1702 | .create = ubifs_create, |
1703 | .link = ubifs_link, |
1704 | .symlink = ubifs_symlink, |
1705 | .unlink = ubifs_unlink, |
1706 | .mkdir = ubifs_mkdir, |
1707 | .rmdir = ubifs_rmdir, |
1708 | .mknod = ubifs_mknod, |
1709 | .rename = ubifs_rename, |
1710 | .setattr = ubifs_setattr, |
1711 | .getattr = ubifs_getattr, |
1712 | .listxattr = ubifs_listxattr, |
1713 | .update_time = ubifs_update_time, |
1714 | .tmpfile = ubifs_tmpfile, |
1715 | .fileattr_get = ubifs_fileattr_get, |
1716 | .fileattr_set = ubifs_fileattr_set, |
1717 | }; |
1718 | |
1719 | const struct file_operations ubifs_dir_operations = { |
1720 | .llseek = generic_file_llseek, |
1721 | .release = ubifs_dir_release, |
1722 | .read = generic_read_dir, |
1723 | .iterate_shared = ubifs_readdir, |
1724 | .fsync = ubifs_fsync, |
1725 | .unlocked_ioctl = ubifs_ioctl, |
1726 | #ifdef CONFIG_COMPAT |
1727 | .compat_ioctl = ubifs_compat_ioctl, |
1728 | #endif |
1729 | }; |
1730 | |