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