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1e51764a AB |
1 | /* |
2 | * This file is part of UBIFS. | |
3 | * | |
4 | * Copyright (C) 2006-2008 Nokia Corporation. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License version 2 as published by | |
8 | * the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
13 | * more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License along with | |
16 | * this program; if not, write to the Free Software Foundation, Inc., 51 | |
17 | * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
18 | * | |
19 | * Authors: Artem Bityutskiy (Битюцкий Артём) | |
20 | * Adrian Hunter | |
21 | */ | |
22 | ||
23 | /* | |
24 | * This file implements UBIFS initialization and VFS superblock operations. Some | |
25 | * initialization stuff which is rather large and complex is placed at | |
26 | * corresponding subsystems, but most of it is here. | |
27 | */ | |
28 | ||
29 | #include <linux/init.h> | |
30 | #include <linux/slab.h> | |
31 | #include <linux/module.h> | |
32 | #include <linux/ctype.h> | |
1e51764a AB |
33 | #include <linux/kthread.h> |
34 | #include <linux/parser.h> | |
35 | #include <linux/seq_file.h> | |
36 | #include <linux/mount.h> | |
4d61db4f | 37 | #include <linux/math64.h> |
304d427c | 38 | #include <linux/writeback.h> |
1e51764a AB |
39 | #include "ubifs.h" |
40 | ||
39ce81ce AB |
41 | /* |
42 | * Maximum amount of memory we may 'kmalloc()' without worrying that we are | |
43 | * allocating too much. | |
44 | */ | |
45 | #define UBIFS_KMALLOC_OK (128*1024) | |
46 | ||
1e51764a AB |
47 | /* Slab cache for UBIFS inodes */ |
48 | struct kmem_cache *ubifs_inode_slab; | |
49 | ||
50 | /* UBIFS TNC shrinker description */ | |
51 | static struct shrinker ubifs_shrinker_info = { | |
52 | .shrink = ubifs_shrinker, | |
53 | .seeks = DEFAULT_SEEKS, | |
54 | }; | |
55 | ||
56 | /** | |
57 | * validate_inode - validate inode. | |
58 | * @c: UBIFS file-system description object | |
59 | * @inode: the inode to validate | |
60 | * | |
61 | * This is a helper function for 'ubifs_iget()' which validates various fields | |
62 | * of a newly built inode to make sure they contain sane values and prevent | |
63 | * possible vulnerabilities. Returns zero if the inode is all right and | |
64 | * a non-zero error code if not. | |
65 | */ | |
66 | static int validate_inode(struct ubifs_info *c, const struct inode *inode) | |
67 | { | |
68 | int err; | |
69 | const struct ubifs_inode *ui = ubifs_inode(inode); | |
70 | ||
71 | if (inode->i_size > c->max_inode_sz) { | |
72 | ubifs_err("inode is too large (%lld)", | |
73 | (long long)inode->i_size); | |
74 | return 1; | |
75 | } | |
76 | ||
77 | if (ui->compr_type < 0 || ui->compr_type >= UBIFS_COMPR_TYPES_CNT) { | |
78 | ubifs_err("unknown compression type %d", ui->compr_type); | |
79 | return 2; | |
80 | } | |
81 | ||
82 | if (ui->xattr_names + ui->xattr_cnt > XATTR_LIST_MAX) | |
83 | return 3; | |
84 | ||
85 | if (ui->data_len < 0 || ui->data_len > UBIFS_MAX_INO_DATA) | |
86 | return 4; | |
87 | ||
88 | if (ui->xattr && (inode->i_mode & S_IFMT) != S_IFREG) | |
89 | return 5; | |
90 | ||
91 | if (!ubifs_compr_present(ui->compr_type)) { | |
92 | ubifs_warn("inode %lu uses '%s' compression, but it was not " | |
93 | "compiled in", inode->i_ino, | |
94 | ubifs_compr_name(ui->compr_type)); | |
95 | } | |
96 | ||
97 | err = dbg_check_dir_size(c, inode); | |
98 | return err; | |
99 | } | |
100 | ||
101 | struct inode *ubifs_iget(struct super_block *sb, unsigned long inum) | |
102 | { | |
103 | int err; | |
104 | union ubifs_key key; | |
105 | struct ubifs_ino_node *ino; | |
106 | struct ubifs_info *c = sb->s_fs_info; | |
107 | struct inode *inode; | |
108 | struct ubifs_inode *ui; | |
109 | ||
110 | dbg_gen("inode %lu", inum); | |
111 | ||
112 | inode = iget_locked(sb, inum); | |
113 | if (!inode) | |
114 | return ERR_PTR(-ENOMEM); | |
115 | if (!(inode->i_state & I_NEW)) | |
116 | return inode; | |
117 | ui = ubifs_inode(inode); | |
118 | ||
119 | ino = kmalloc(UBIFS_MAX_INO_NODE_SZ, GFP_NOFS); | |
120 | if (!ino) { | |
121 | err = -ENOMEM; | |
122 | goto out; | |
123 | } | |
124 | ||
125 | ino_key_init(c, &key, inode->i_ino); | |
126 | ||
127 | err = ubifs_tnc_lookup(c, &key, ino); | |
128 | if (err) | |
129 | goto out_ino; | |
130 | ||
131 | inode->i_flags |= (S_NOCMTIME | S_NOATIME); | |
132 | inode->i_nlink = le32_to_cpu(ino->nlink); | |
133 | inode->i_uid = le32_to_cpu(ino->uid); | |
134 | inode->i_gid = le32_to_cpu(ino->gid); | |
135 | inode->i_atime.tv_sec = (int64_t)le64_to_cpu(ino->atime_sec); | |
136 | inode->i_atime.tv_nsec = le32_to_cpu(ino->atime_nsec); | |
137 | inode->i_mtime.tv_sec = (int64_t)le64_to_cpu(ino->mtime_sec); | |
138 | inode->i_mtime.tv_nsec = le32_to_cpu(ino->mtime_nsec); | |
139 | inode->i_ctime.tv_sec = (int64_t)le64_to_cpu(ino->ctime_sec); | |
140 | inode->i_ctime.tv_nsec = le32_to_cpu(ino->ctime_nsec); | |
141 | inode->i_mode = le32_to_cpu(ino->mode); | |
142 | inode->i_size = le64_to_cpu(ino->size); | |
143 | ||
144 | ui->data_len = le32_to_cpu(ino->data_len); | |
145 | ui->flags = le32_to_cpu(ino->flags); | |
146 | ui->compr_type = le16_to_cpu(ino->compr_type); | |
147 | ui->creat_sqnum = le64_to_cpu(ino->creat_sqnum); | |
148 | ui->xattr_cnt = le32_to_cpu(ino->xattr_cnt); | |
149 | ui->xattr_size = le32_to_cpu(ino->xattr_size); | |
150 | ui->xattr_names = le32_to_cpu(ino->xattr_names); | |
151 | ui->synced_i_size = ui->ui_size = inode->i_size; | |
152 | ||
153 | ui->xattr = (ui->flags & UBIFS_XATTR_FL) ? 1 : 0; | |
154 | ||
155 | err = validate_inode(c, inode); | |
156 | if (err) | |
157 | goto out_invalid; | |
158 | ||
0a883a05 | 159 | /* Disable read-ahead */ |
1e51764a AB |
160 | inode->i_mapping->backing_dev_info = &c->bdi; |
161 | ||
162 | switch (inode->i_mode & S_IFMT) { | |
163 | case S_IFREG: | |
164 | inode->i_mapping->a_ops = &ubifs_file_address_operations; | |
165 | inode->i_op = &ubifs_file_inode_operations; | |
166 | inode->i_fop = &ubifs_file_operations; | |
167 | if (ui->xattr) { | |
168 | ui->data = kmalloc(ui->data_len + 1, GFP_NOFS); | |
169 | if (!ui->data) { | |
170 | err = -ENOMEM; | |
171 | goto out_ino; | |
172 | } | |
173 | memcpy(ui->data, ino->data, ui->data_len); | |
174 | ((char *)ui->data)[ui->data_len] = '\0'; | |
175 | } else if (ui->data_len != 0) { | |
176 | err = 10; | |
177 | goto out_invalid; | |
178 | } | |
179 | break; | |
180 | case S_IFDIR: | |
181 | inode->i_op = &ubifs_dir_inode_operations; | |
182 | inode->i_fop = &ubifs_dir_operations; | |
183 | if (ui->data_len != 0) { | |
184 | err = 11; | |
185 | goto out_invalid; | |
186 | } | |
187 | break; | |
188 | case S_IFLNK: | |
189 | inode->i_op = &ubifs_symlink_inode_operations; | |
190 | if (ui->data_len <= 0 || ui->data_len > UBIFS_MAX_INO_DATA) { | |
191 | err = 12; | |
192 | goto out_invalid; | |
193 | } | |
194 | ui->data = kmalloc(ui->data_len + 1, GFP_NOFS); | |
195 | if (!ui->data) { | |
196 | err = -ENOMEM; | |
197 | goto out_ino; | |
198 | } | |
199 | memcpy(ui->data, ino->data, ui->data_len); | |
200 | ((char *)ui->data)[ui->data_len] = '\0'; | |
201 | break; | |
202 | case S_IFBLK: | |
203 | case S_IFCHR: | |
204 | { | |
205 | dev_t rdev; | |
206 | union ubifs_dev_desc *dev; | |
207 | ||
208 | ui->data = kmalloc(sizeof(union ubifs_dev_desc), GFP_NOFS); | |
209 | if (!ui->data) { | |
210 | err = -ENOMEM; | |
211 | goto out_ino; | |
212 | } | |
213 | ||
214 | dev = (union ubifs_dev_desc *)ino->data; | |
215 | if (ui->data_len == sizeof(dev->new)) | |
216 | rdev = new_decode_dev(le32_to_cpu(dev->new)); | |
217 | else if (ui->data_len == sizeof(dev->huge)) | |
218 | rdev = huge_decode_dev(le64_to_cpu(dev->huge)); | |
219 | else { | |
220 | err = 13; | |
221 | goto out_invalid; | |
222 | } | |
223 | memcpy(ui->data, ino->data, ui->data_len); | |
224 | inode->i_op = &ubifs_file_inode_operations; | |
225 | init_special_inode(inode, inode->i_mode, rdev); | |
226 | break; | |
227 | } | |
228 | case S_IFSOCK: | |
229 | case S_IFIFO: | |
230 | inode->i_op = &ubifs_file_inode_operations; | |
231 | init_special_inode(inode, inode->i_mode, 0); | |
232 | if (ui->data_len != 0) { | |
233 | err = 14; | |
234 | goto out_invalid; | |
235 | } | |
236 | break; | |
237 | default: | |
238 | err = 15; | |
239 | goto out_invalid; | |
240 | } | |
241 | ||
242 | kfree(ino); | |
243 | ubifs_set_inode_flags(inode); | |
244 | unlock_new_inode(inode); | |
245 | return inode; | |
246 | ||
247 | out_invalid: | |
248 | ubifs_err("inode %lu validation failed, error %d", inode->i_ino, err); | |
249 | dbg_dump_node(c, ino); | |
250 | dbg_dump_inode(c, inode); | |
251 | err = -EINVAL; | |
252 | out_ino: | |
253 | kfree(ino); | |
254 | out: | |
255 | ubifs_err("failed to read inode %lu, error %d", inode->i_ino, err); | |
256 | iget_failed(inode); | |
257 | return ERR_PTR(err); | |
258 | } | |
259 | ||
260 | static struct inode *ubifs_alloc_inode(struct super_block *sb) | |
261 | { | |
262 | struct ubifs_inode *ui; | |
263 | ||
264 | ui = kmem_cache_alloc(ubifs_inode_slab, GFP_NOFS); | |
265 | if (!ui) | |
266 | return NULL; | |
267 | ||
268 | memset((void *)ui + sizeof(struct inode), 0, | |
269 | sizeof(struct ubifs_inode) - sizeof(struct inode)); | |
270 | mutex_init(&ui->ui_mutex); | |
271 | spin_lock_init(&ui->ui_lock); | |
272 | return &ui->vfs_inode; | |
273 | }; | |
274 | ||
fa0d7e3d NP |
275 | static void ubifs_i_callback(struct rcu_head *head) |
276 | { | |
277 | struct inode *inode = container_of(head, struct inode, i_rcu); | |
278 | struct ubifs_inode *ui = ubifs_inode(inode); | |
279 | INIT_LIST_HEAD(&inode->i_dentry); | |
280 | kmem_cache_free(ubifs_inode_slab, ui); | |
281 | } | |
282 | ||
1e51764a AB |
283 | static void ubifs_destroy_inode(struct inode *inode) |
284 | { | |
285 | struct ubifs_inode *ui = ubifs_inode(inode); | |
286 | ||
287 | kfree(ui->data); | |
fa0d7e3d | 288 | call_rcu(&inode->i_rcu, ubifs_i_callback); |
1e51764a AB |
289 | } |
290 | ||
291 | /* | |
292 | * Note, Linux write-back code calls this without 'i_mutex'. | |
293 | */ | |
a9185b41 | 294 | static int ubifs_write_inode(struct inode *inode, struct writeback_control *wbc) |
1e51764a | 295 | { |
fbfa6c88 | 296 | int err = 0; |
1e51764a AB |
297 | struct ubifs_info *c = inode->i_sb->s_fs_info; |
298 | struct ubifs_inode *ui = ubifs_inode(inode); | |
299 | ||
300 | ubifs_assert(!ui->xattr); | |
301 | if (is_bad_inode(inode)) | |
302 | return 0; | |
303 | ||
304 | mutex_lock(&ui->ui_mutex); | |
305 | /* | |
306 | * Due to races between write-back forced by budgeting | |
307 | * (see 'sync_some_inodes()') and pdflush write-back, the inode may | |
308 | * have already been synchronized, do not do this again. This might | |
309 | * also happen if it was synchronized in an VFS operation, e.g. | |
310 | * 'ubifs_link()'. | |
311 | */ | |
312 | if (!ui->dirty) { | |
313 | mutex_unlock(&ui->ui_mutex); | |
314 | return 0; | |
315 | } | |
316 | ||
fbfa6c88 AB |
317 | /* |
318 | * As an optimization, do not write orphan inodes to the media just | |
319 | * because this is not needed. | |
320 | */ | |
321 | dbg_gen("inode %lu, mode %#x, nlink %u", | |
322 | inode->i_ino, (int)inode->i_mode, inode->i_nlink); | |
323 | if (inode->i_nlink) { | |
1f28681a | 324 | err = ubifs_jnl_write_inode(c, inode); |
fbfa6c88 AB |
325 | if (err) |
326 | ubifs_err("can't write inode %lu, error %d", | |
327 | inode->i_ino, err); | |
e3c3efc2 AB |
328 | else |
329 | err = dbg_check_inode_size(c, inode, ui->ui_size); | |
fbfa6c88 | 330 | } |
1e51764a AB |
331 | |
332 | ui->dirty = 0; | |
333 | mutex_unlock(&ui->ui_mutex); | |
334 | ubifs_release_dirty_inode_budget(c, ui); | |
335 | return err; | |
336 | } | |
337 | ||
d640e1b5 | 338 | static void ubifs_evict_inode(struct inode *inode) |
1e51764a AB |
339 | { |
340 | int err; | |
341 | struct ubifs_info *c = inode->i_sb->s_fs_info; | |
1e0f358e | 342 | struct ubifs_inode *ui = ubifs_inode(inode); |
1e51764a | 343 | |
1e0f358e | 344 | if (ui->xattr) |
1e51764a AB |
345 | /* |
346 | * Extended attribute inode deletions are fully handled in | |
347 | * 'ubifs_removexattr()'. These inodes are special and have | |
348 | * limited usage, so there is nothing to do here. | |
349 | */ | |
350 | goto out; | |
351 | ||
7d32c2bb | 352 | dbg_gen("inode %lu, mode %#x", inode->i_ino, (int)inode->i_mode); |
1e51764a | 353 | ubifs_assert(!atomic_read(&inode->i_count)); |
1e51764a AB |
354 | |
355 | truncate_inode_pages(&inode->i_data, 0); | |
d640e1b5 AV |
356 | |
357 | if (inode->i_nlink) | |
358 | goto done; | |
359 | ||
1e51764a AB |
360 | if (is_bad_inode(inode)) |
361 | goto out; | |
362 | ||
1e0f358e | 363 | ui->ui_size = inode->i_size = 0; |
de94eb55 | 364 | err = ubifs_jnl_delete_inode(c, inode); |
1e51764a AB |
365 | if (err) |
366 | /* | |
367 | * Worst case we have a lost orphan inode wasting space, so a | |
0a883a05 | 368 | * simple error message is OK here. |
1e51764a | 369 | */ |
de94eb55 AB |
370 | ubifs_err("can't delete inode %lu, error %d", |
371 | inode->i_ino, err); | |
372 | ||
1e51764a | 373 | out: |
1e0f358e AB |
374 | if (ui->dirty) |
375 | ubifs_release_dirty_inode_budget(c, ui); | |
6d6cb0d6 AH |
376 | else { |
377 | /* We've deleted something - clean the "no space" flags */ | |
378 | c->nospace = c->nospace_rp = 0; | |
379 | smp_wmb(); | |
380 | } | |
d640e1b5 AV |
381 | done: |
382 | end_writeback(inode); | |
1e51764a AB |
383 | } |
384 | ||
385 | static void ubifs_dirty_inode(struct inode *inode) | |
386 | { | |
387 | struct ubifs_inode *ui = ubifs_inode(inode); | |
388 | ||
389 | ubifs_assert(mutex_is_locked(&ui->ui_mutex)); | |
390 | if (!ui->dirty) { | |
391 | ui->dirty = 1; | |
392 | dbg_gen("inode %lu", inode->i_ino); | |
393 | } | |
394 | } | |
395 | ||
396 | static int ubifs_statfs(struct dentry *dentry, struct kstatfs *buf) | |
397 | { | |
398 | struct ubifs_info *c = dentry->d_sb->s_fs_info; | |
399 | unsigned long long free; | |
7c7cbadf | 400 | __le32 *uuid = (__le32 *)c->uuid; |
1e51764a | 401 | |
7dad181b | 402 | free = ubifs_get_free_space(c); |
1e51764a AB |
403 | dbg_gen("free space %lld bytes (%lld blocks)", |
404 | free, free >> UBIFS_BLOCK_SHIFT); | |
405 | ||
406 | buf->f_type = UBIFS_SUPER_MAGIC; | |
407 | buf->f_bsize = UBIFS_BLOCK_SIZE; | |
408 | buf->f_blocks = c->block_cnt; | |
409 | buf->f_bfree = free >> UBIFS_BLOCK_SHIFT; | |
410 | if (free > c->report_rp_size) | |
411 | buf->f_bavail = (free - c->report_rp_size) >> UBIFS_BLOCK_SHIFT; | |
412 | else | |
413 | buf->f_bavail = 0; | |
414 | buf->f_files = 0; | |
415 | buf->f_ffree = 0; | |
416 | buf->f_namelen = UBIFS_MAX_NLEN; | |
7c7cbadf AB |
417 | buf->f_fsid.val[0] = le32_to_cpu(uuid[0]) ^ le32_to_cpu(uuid[2]); |
418 | buf->f_fsid.val[1] = le32_to_cpu(uuid[1]) ^ le32_to_cpu(uuid[3]); | |
b4978e94 | 419 | ubifs_assert(buf->f_bfree <= c->block_cnt); |
1e51764a AB |
420 | return 0; |
421 | } | |
422 | ||
423 | static int ubifs_show_options(struct seq_file *s, struct vfsmount *mnt) | |
424 | { | |
425 | struct ubifs_info *c = mnt->mnt_sb->s_fs_info; | |
426 | ||
427 | if (c->mount_opts.unmount_mode == 2) | |
428 | seq_printf(s, ",fast_unmount"); | |
429 | else if (c->mount_opts.unmount_mode == 1) | |
430 | seq_printf(s, ",norm_unmount"); | |
431 | ||
4793e7c5 AH |
432 | if (c->mount_opts.bulk_read == 2) |
433 | seq_printf(s, ",bulk_read"); | |
434 | else if (c->mount_opts.bulk_read == 1) | |
435 | seq_printf(s, ",no_bulk_read"); | |
436 | ||
2953e73f AH |
437 | if (c->mount_opts.chk_data_crc == 2) |
438 | seq_printf(s, ",chk_data_crc"); | |
439 | else if (c->mount_opts.chk_data_crc == 1) | |
440 | seq_printf(s, ",no_chk_data_crc"); | |
441 | ||
553dea4d | 442 | if (c->mount_opts.override_compr) { |
fcabb347 HA |
443 | seq_printf(s, ",compr=%s", |
444 | ubifs_compr_name(c->mount_opts.compr_type)); | |
553dea4d AB |
445 | } |
446 | ||
1e51764a AB |
447 | return 0; |
448 | } | |
449 | ||
450 | static int ubifs_sync_fs(struct super_block *sb, int wait) | |
451 | { | |
f1038300 | 452 | int i, err; |
1e51764a | 453 | struct ubifs_info *c = sb->s_fs_info; |
304d427c | 454 | |
e8ea1759 | 455 | /* |
dedb0d48 AB |
456 | * Zero @wait is just an advisory thing to help the file system shove |
457 | * lots of data into the queues, and there will be the second | |
e8ea1759 AB |
458 | * '->sync_fs()' call, with non-zero @wait. |
459 | */ | |
dedb0d48 AB |
460 | if (!wait) |
461 | return 0; | |
e8ea1759 | 462 | |
3eb14297 AH |
463 | /* |
464 | * Synchronize write buffers, because 'ubifs_run_commit()' does not | |
465 | * do this if it waits for an already running commit. | |
466 | */ | |
467 | for (i = 0; i < c->jhead_cnt; i++) { | |
468 | err = ubifs_wbuf_sync(&c->jheads[i].wbuf); | |
469 | if (err) | |
470 | return err; | |
471 | } | |
472 | ||
887ee171 AB |
473 | /* |
474 | * Strictly speaking, it is not necessary to commit the journal here, | |
475 | * synchronizing write-buffers would be enough. But committing makes | |
476 | * UBIFS free space predictions much more accurate, so we want to let | |
477 | * the user be able to get more accurate results of 'statfs()' after | |
478 | * they synchronize the file system. | |
479 | */ | |
f1038300 AB |
480 | err = ubifs_run_commit(c); |
481 | if (err) | |
482 | return err; | |
403e12ab | 483 | |
cb5c6a2b | 484 | return ubi_sync(c->vi.ubi_num); |
1e51764a AB |
485 | } |
486 | ||
487 | /** | |
488 | * init_constants_early - initialize UBIFS constants. | |
489 | * @c: UBIFS file-system description object | |
490 | * | |
491 | * This function initialize UBIFS constants which do not need the superblock to | |
492 | * be read. It also checks that the UBI volume satisfies basic UBIFS | |
493 | * requirements. Returns zero in case of success and a negative error code in | |
494 | * case of failure. | |
495 | */ | |
496 | static int init_constants_early(struct ubifs_info *c) | |
497 | { | |
498 | if (c->vi.corrupted) { | |
499 | ubifs_warn("UBI volume is corrupted - read-only mode"); | |
500 | c->ro_media = 1; | |
501 | } | |
502 | ||
503 | if (c->di.ro_mode) { | |
504 | ubifs_msg("read-only UBI device"); | |
505 | c->ro_media = 1; | |
506 | } | |
507 | ||
508 | if (c->vi.vol_type == UBI_STATIC_VOLUME) { | |
509 | ubifs_msg("static UBI volume - read-only mode"); | |
510 | c->ro_media = 1; | |
511 | } | |
512 | ||
513 | c->leb_cnt = c->vi.size; | |
514 | c->leb_size = c->vi.usable_leb_size; | |
515 | c->half_leb_size = c->leb_size / 2; | |
516 | c->min_io_size = c->di.min_io_size; | |
517 | c->min_io_shift = fls(c->min_io_size) - 1; | |
518 | ||
519 | if (c->leb_size < UBIFS_MIN_LEB_SZ) { | |
520 | ubifs_err("too small LEBs (%d bytes), min. is %d bytes", | |
521 | c->leb_size, UBIFS_MIN_LEB_SZ); | |
522 | return -EINVAL; | |
523 | } | |
524 | ||
525 | if (c->leb_cnt < UBIFS_MIN_LEB_CNT) { | |
526 | ubifs_err("too few LEBs (%d), min. is %d", | |
527 | c->leb_cnt, UBIFS_MIN_LEB_CNT); | |
528 | return -EINVAL; | |
529 | } | |
530 | ||
531 | if (!is_power_of_2(c->min_io_size)) { | |
532 | ubifs_err("bad min. I/O size %d", c->min_io_size); | |
533 | return -EINVAL; | |
534 | } | |
535 | ||
536 | /* | |
537 | * UBIFS aligns all node to 8-byte boundary, so to make function in | |
538 | * io.c simpler, assume minimum I/O unit size to be 8 bytes if it is | |
539 | * less than 8. | |
540 | */ | |
541 | if (c->min_io_size < 8) { | |
542 | c->min_io_size = 8; | |
543 | c->min_io_shift = 3; | |
544 | } | |
545 | ||
546 | c->ref_node_alsz = ALIGN(UBIFS_REF_NODE_SZ, c->min_io_size); | |
547 | c->mst_node_alsz = ALIGN(UBIFS_MST_NODE_SZ, c->min_io_size); | |
548 | ||
549 | /* | |
550 | * Initialize node length ranges which are mostly needed for node | |
551 | * length validation. | |
552 | */ | |
553 | c->ranges[UBIFS_PAD_NODE].len = UBIFS_PAD_NODE_SZ; | |
554 | c->ranges[UBIFS_SB_NODE].len = UBIFS_SB_NODE_SZ; | |
555 | c->ranges[UBIFS_MST_NODE].len = UBIFS_MST_NODE_SZ; | |
556 | c->ranges[UBIFS_REF_NODE].len = UBIFS_REF_NODE_SZ; | |
557 | c->ranges[UBIFS_TRUN_NODE].len = UBIFS_TRUN_NODE_SZ; | |
558 | c->ranges[UBIFS_CS_NODE].len = UBIFS_CS_NODE_SZ; | |
559 | ||
560 | c->ranges[UBIFS_INO_NODE].min_len = UBIFS_INO_NODE_SZ; | |
561 | c->ranges[UBIFS_INO_NODE].max_len = UBIFS_MAX_INO_NODE_SZ; | |
562 | c->ranges[UBIFS_ORPH_NODE].min_len = | |
563 | UBIFS_ORPH_NODE_SZ + sizeof(__le64); | |
564 | c->ranges[UBIFS_ORPH_NODE].max_len = c->leb_size; | |
565 | c->ranges[UBIFS_DENT_NODE].min_len = UBIFS_DENT_NODE_SZ; | |
566 | c->ranges[UBIFS_DENT_NODE].max_len = UBIFS_MAX_DENT_NODE_SZ; | |
567 | c->ranges[UBIFS_XENT_NODE].min_len = UBIFS_XENT_NODE_SZ; | |
568 | c->ranges[UBIFS_XENT_NODE].max_len = UBIFS_MAX_XENT_NODE_SZ; | |
569 | c->ranges[UBIFS_DATA_NODE].min_len = UBIFS_DATA_NODE_SZ; | |
570 | c->ranges[UBIFS_DATA_NODE].max_len = UBIFS_MAX_DATA_NODE_SZ; | |
571 | /* | |
572 | * Minimum indexing node size is amended later when superblock is | |
573 | * read and the key length is known. | |
574 | */ | |
575 | c->ranges[UBIFS_IDX_NODE].min_len = UBIFS_IDX_NODE_SZ + UBIFS_BRANCH_SZ; | |
576 | /* | |
577 | * Maximum indexing node size is amended later when superblock is | |
578 | * read and the fanout is known. | |
579 | */ | |
580 | c->ranges[UBIFS_IDX_NODE].max_len = INT_MAX; | |
581 | ||
582 | /* | |
7078202e AB |
583 | * Initialize dead and dark LEB space watermarks. See gc.c for comments |
584 | * about these values. | |
1e51764a AB |
585 | */ |
586 | c->dead_wm = ALIGN(MIN_WRITE_SZ, c->min_io_size); | |
587 | c->dark_wm = ALIGN(UBIFS_MAX_NODE_SZ, c->min_io_size); | |
588 | ||
9bbb5726 AB |
589 | /* |
590 | * Calculate how many bytes would be wasted at the end of LEB if it was | |
591 | * fully filled with data nodes of maximum size. This is used in | |
592 | * calculations when reporting free space. | |
593 | */ | |
594 | c->leb_overhead = c->leb_size % UBIFS_MAX_DATA_NODE_SZ; | |
39ce81ce | 595 | |
4793e7c5 | 596 | /* Buffer size for bulk-reads */ |
6c0c42cd AB |
597 | c->max_bu_buf_len = UBIFS_MAX_BULK_READ * UBIFS_MAX_DATA_NODE_SZ; |
598 | if (c->max_bu_buf_len > c->leb_size) | |
599 | c->max_bu_buf_len = c->leb_size; | |
1e51764a AB |
600 | return 0; |
601 | } | |
602 | ||
603 | /** | |
604 | * bud_wbuf_callback - bud LEB write-buffer synchronization call-back. | |
605 | * @c: UBIFS file-system description object | |
606 | * @lnum: LEB the write-buffer was synchronized to | |
607 | * @free: how many free bytes left in this LEB | |
608 | * @pad: how many bytes were padded | |
609 | * | |
610 | * This is a callback function which is called by the I/O unit when the | |
611 | * write-buffer is synchronized. We need this to correctly maintain space | |
612 | * accounting in bud logical eraseblocks. This function returns zero in case of | |
613 | * success and a negative error code in case of failure. | |
614 | * | |
615 | * This function actually belongs to the journal, but we keep it here because | |
616 | * we want to keep it static. | |
617 | */ | |
618 | static int bud_wbuf_callback(struct ubifs_info *c, int lnum, int free, int pad) | |
619 | { | |
620 | return ubifs_update_one_lp(c, lnum, free, pad, 0, 0); | |
621 | } | |
622 | ||
623 | /* | |
79807d07 | 624 | * init_constants_sb - initialize UBIFS constants. |
1e51764a AB |
625 | * @c: UBIFS file-system description object |
626 | * | |
627 | * This is a helper function which initializes various UBIFS constants after | |
628 | * the superblock has been read. It also checks various UBIFS parameters and | |
629 | * makes sure they are all right. Returns zero in case of success and a | |
630 | * negative error code in case of failure. | |
631 | */ | |
79807d07 | 632 | static int init_constants_sb(struct ubifs_info *c) |
1e51764a AB |
633 | { |
634 | int tmp, err; | |
4d61db4f | 635 | long long tmp64; |
1e51764a AB |
636 | |
637 | c->main_bytes = (long long)c->main_lebs * c->leb_size; | |
638 | c->max_znode_sz = sizeof(struct ubifs_znode) + | |
639 | c->fanout * sizeof(struct ubifs_zbranch); | |
640 | ||
641 | tmp = ubifs_idx_node_sz(c, 1); | |
642 | c->ranges[UBIFS_IDX_NODE].min_len = tmp; | |
643 | c->min_idx_node_sz = ALIGN(tmp, 8); | |
644 | ||
645 | tmp = ubifs_idx_node_sz(c, c->fanout); | |
646 | c->ranges[UBIFS_IDX_NODE].max_len = tmp; | |
647 | c->max_idx_node_sz = ALIGN(tmp, 8); | |
648 | ||
649 | /* Make sure LEB size is large enough to fit full commit */ | |
650 | tmp = UBIFS_CS_NODE_SZ + UBIFS_REF_NODE_SZ * c->jhead_cnt; | |
651 | tmp = ALIGN(tmp, c->min_io_size); | |
652 | if (tmp > c->leb_size) { | |
653 | dbg_err("too small LEB size %d, at least %d needed", | |
654 | c->leb_size, tmp); | |
655 | return -EINVAL; | |
656 | } | |
657 | ||
658 | /* | |
659 | * Make sure that the log is large enough to fit reference nodes for | |
660 | * all buds plus one reserved LEB. | |
661 | */ | |
4d61db4f AB |
662 | tmp64 = c->max_bud_bytes + c->leb_size - 1; |
663 | c->max_bud_cnt = div_u64(tmp64, c->leb_size); | |
1e51764a AB |
664 | tmp = (c->ref_node_alsz * c->max_bud_cnt + c->leb_size - 1); |
665 | tmp /= c->leb_size; | |
666 | tmp += 1; | |
667 | if (c->log_lebs < tmp) { | |
668 | dbg_err("too small log %d LEBs, required min. %d LEBs", | |
669 | c->log_lebs, tmp); | |
670 | return -EINVAL; | |
671 | } | |
672 | ||
673 | /* | |
674 | * When budgeting we assume worst-case scenarios when the pages are not | |
675 | * be compressed and direntries are of the maximum size. | |
676 | * | |
677 | * Note, data, which may be stored in inodes is budgeted separately, so | |
678 | * it is not included into 'c->inode_budget'. | |
679 | */ | |
680 | c->page_budget = UBIFS_MAX_DATA_NODE_SZ * UBIFS_BLOCKS_PER_PAGE; | |
681 | c->inode_budget = UBIFS_INO_NODE_SZ; | |
682 | c->dent_budget = UBIFS_MAX_DENT_NODE_SZ; | |
683 | ||
684 | /* | |
685 | * When the amount of flash space used by buds becomes | |
686 | * 'c->max_bud_bytes', UBIFS just blocks all writers and starts commit. | |
687 | * The writers are unblocked when the commit is finished. To avoid | |
688 | * writers to be blocked UBIFS initiates background commit in advance, | |
689 | * when number of bud bytes becomes above the limit defined below. | |
690 | */ | |
691 | c->bg_bud_bytes = (c->max_bud_bytes * 13) >> 4; | |
692 | ||
693 | /* | |
694 | * Ensure minimum journal size. All the bytes in the journal heads are | |
695 | * considered to be used, when calculating the current journal usage. | |
696 | * Consequently, if the journal is too small, UBIFS will treat it as | |
697 | * always full. | |
698 | */ | |
4d61db4f | 699 | tmp64 = (long long)(c->jhead_cnt + 1) * c->leb_size + 1; |
1e51764a AB |
700 | if (c->bg_bud_bytes < tmp64) |
701 | c->bg_bud_bytes = tmp64; | |
702 | if (c->max_bud_bytes < tmp64 + c->leb_size) | |
703 | c->max_bud_bytes = tmp64 + c->leb_size; | |
704 | ||
705 | err = ubifs_calc_lpt_geom(c); | |
706 | if (err) | |
707 | return err; | |
708 | ||
fb1cd01a AB |
709 | /* Initialize effective LEB size used in budgeting calculations */ |
710 | c->idx_leb_size = c->leb_size - c->max_idx_node_sz; | |
79807d07 AB |
711 | return 0; |
712 | } | |
713 | ||
714 | /* | |
715 | * init_constants_master - initialize UBIFS constants. | |
716 | * @c: UBIFS file-system description object | |
717 | * | |
718 | * This is a helper function which initializes various UBIFS constants after | |
719 | * the master node has been read. It also checks various UBIFS parameters and | |
720 | * makes sure they are all right. | |
721 | */ | |
722 | static void init_constants_master(struct ubifs_info *c) | |
723 | { | |
724 | long long tmp64; | |
725 | ||
1e51764a | 726 | c->min_idx_lebs = ubifs_calc_min_idx_lebs(c); |
fb1cd01a | 727 | c->report_rp_size = ubifs_reported_space(c, c->rp_size); |
1e51764a AB |
728 | |
729 | /* | |
730 | * Calculate total amount of FS blocks. This number is not used | |
731 | * internally because it does not make much sense for UBIFS, but it is | |
732 | * necessary to report something for the 'statfs()' call. | |
733 | * | |
7dad181b | 734 | * Subtract the LEB reserved for GC, the LEB which is reserved for |
af14a1ad AB |
735 | * deletions, minimum LEBs for the index, and assume only one journal |
736 | * head is available. | |
1e51764a | 737 | */ |
af14a1ad | 738 | tmp64 = c->main_lebs - 1 - 1 - MIN_INDEX_LEBS - c->jhead_cnt + 1; |
4d61db4f | 739 | tmp64 *= (long long)c->leb_size - c->leb_overhead; |
1e51764a AB |
740 | tmp64 = ubifs_reported_space(c, tmp64); |
741 | c->block_cnt = tmp64 >> UBIFS_BLOCK_SHIFT; | |
1e51764a AB |
742 | } |
743 | ||
744 | /** | |
745 | * take_gc_lnum - reserve GC LEB. | |
746 | * @c: UBIFS file-system description object | |
747 | * | |
b4978e94 AB |
748 | * This function ensures that the LEB reserved for garbage collection is marked |
749 | * as "taken" in lprops. We also have to set free space to LEB size and dirty | |
750 | * space to zero, because lprops may contain out-of-date information if the | |
751 | * file-system was un-mounted before it has been committed. This function | |
752 | * returns zero in case of success and a negative error code in case of | |
753 | * failure. | |
1e51764a AB |
754 | */ |
755 | static int take_gc_lnum(struct ubifs_info *c) | |
756 | { | |
757 | int err; | |
758 | ||
759 | if (c->gc_lnum == -1) { | |
760 | ubifs_err("no LEB for GC"); | |
761 | return -EINVAL; | |
762 | } | |
763 | ||
1e51764a AB |
764 | /* And we have to tell lprops that this LEB is taken */ |
765 | err = ubifs_change_one_lp(c, c->gc_lnum, c->leb_size, 0, | |
766 | LPROPS_TAKEN, 0, 0); | |
767 | return err; | |
768 | } | |
769 | ||
770 | /** | |
771 | * alloc_wbufs - allocate write-buffers. | |
772 | * @c: UBIFS file-system description object | |
773 | * | |
774 | * This helper function allocates and initializes UBIFS write-buffers. Returns | |
775 | * zero in case of success and %-ENOMEM in case of failure. | |
776 | */ | |
777 | static int alloc_wbufs(struct ubifs_info *c) | |
778 | { | |
779 | int i, err; | |
780 | ||
781 | c->jheads = kzalloc(c->jhead_cnt * sizeof(struct ubifs_jhead), | |
782 | GFP_KERNEL); | |
783 | if (!c->jheads) | |
784 | return -ENOMEM; | |
785 | ||
786 | /* Initialize journal heads */ | |
787 | for (i = 0; i < c->jhead_cnt; i++) { | |
788 | INIT_LIST_HEAD(&c->jheads[i].buds_list); | |
789 | err = ubifs_wbuf_init(c, &c->jheads[i].wbuf); | |
790 | if (err) | |
791 | return err; | |
792 | ||
793 | c->jheads[i].wbuf.sync_callback = &bud_wbuf_callback; | |
794 | c->jheads[i].wbuf.jhead = i; | |
795 | } | |
796 | ||
797 | c->jheads[BASEHD].wbuf.dtype = UBI_SHORTTERM; | |
798 | /* | |
799 | * Garbage Collector head likely contains long-term data and | |
800 | * does not need to be synchronized by timer. | |
801 | */ | |
802 | c->jheads[GCHD].wbuf.dtype = UBI_LONGTERM; | |
0b335b9d | 803 | c->jheads[GCHD].wbuf.no_timer = 1; |
1e51764a AB |
804 | |
805 | return 0; | |
806 | } | |
807 | ||
808 | /** | |
809 | * free_wbufs - free write-buffers. | |
810 | * @c: UBIFS file-system description object | |
811 | */ | |
812 | static void free_wbufs(struct ubifs_info *c) | |
813 | { | |
814 | int i; | |
815 | ||
816 | if (c->jheads) { | |
817 | for (i = 0; i < c->jhead_cnt; i++) { | |
818 | kfree(c->jheads[i].wbuf.buf); | |
819 | kfree(c->jheads[i].wbuf.inodes); | |
820 | } | |
821 | kfree(c->jheads); | |
822 | c->jheads = NULL; | |
823 | } | |
824 | } | |
825 | ||
826 | /** | |
827 | * free_orphans - free orphans. | |
828 | * @c: UBIFS file-system description object | |
829 | */ | |
830 | static void free_orphans(struct ubifs_info *c) | |
831 | { | |
832 | struct ubifs_orphan *orph; | |
833 | ||
834 | while (c->orph_dnext) { | |
835 | orph = c->orph_dnext; | |
836 | c->orph_dnext = orph->dnext; | |
837 | list_del(&orph->list); | |
838 | kfree(orph); | |
839 | } | |
840 | ||
841 | while (!list_empty(&c->orph_list)) { | |
842 | orph = list_entry(c->orph_list.next, struct ubifs_orphan, list); | |
843 | list_del(&orph->list); | |
844 | kfree(orph); | |
845 | dbg_err("orphan list not empty at unmount"); | |
846 | } | |
847 | ||
848 | vfree(c->orph_buf); | |
849 | c->orph_buf = NULL; | |
850 | } | |
851 | ||
852 | /** | |
853 | * free_buds - free per-bud objects. | |
854 | * @c: UBIFS file-system description object | |
855 | */ | |
856 | static void free_buds(struct ubifs_info *c) | |
857 | { | |
858 | struct rb_node *this = c->buds.rb_node; | |
859 | struct ubifs_bud *bud; | |
860 | ||
861 | while (this) { | |
862 | if (this->rb_left) | |
863 | this = this->rb_left; | |
864 | else if (this->rb_right) | |
865 | this = this->rb_right; | |
866 | else { | |
867 | bud = rb_entry(this, struct ubifs_bud, rb); | |
868 | this = rb_parent(this); | |
869 | if (this) { | |
870 | if (this->rb_left == &bud->rb) | |
871 | this->rb_left = NULL; | |
872 | else | |
873 | this->rb_right = NULL; | |
874 | } | |
875 | kfree(bud); | |
876 | } | |
877 | } | |
878 | } | |
879 | ||
880 | /** | |
881 | * check_volume_empty - check if the UBI volume is empty. | |
882 | * @c: UBIFS file-system description object | |
883 | * | |
884 | * This function checks if the UBIFS volume is empty by looking if its LEBs are | |
885 | * mapped or not. The result of checking is stored in the @c->empty variable. | |
886 | * Returns zero in case of success and a negative error code in case of | |
887 | * failure. | |
888 | */ | |
889 | static int check_volume_empty(struct ubifs_info *c) | |
890 | { | |
891 | int lnum, err; | |
892 | ||
893 | c->empty = 1; | |
894 | for (lnum = 0; lnum < c->leb_cnt; lnum++) { | |
895 | err = ubi_is_mapped(c->ubi, lnum); | |
896 | if (unlikely(err < 0)) | |
897 | return err; | |
898 | if (err == 1) { | |
899 | c->empty = 0; | |
900 | break; | |
901 | } | |
902 | ||
903 | cond_resched(); | |
904 | } | |
905 | ||
906 | return 0; | |
907 | } | |
908 | ||
909 | /* | |
910 | * UBIFS mount options. | |
911 | * | |
912 | * Opt_fast_unmount: do not run a journal commit before un-mounting | |
913 | * Opt_norm_unmount: run a journal commit before un-mounting | |
4793e7c5 AH |
914 | * Opt_bulk_read: enable bulk-reads |
915 | * Opt_no_bulk_read: disable bulk-reads | |
2953e73f AH |
916 | * Opt_chk_data_crc: check CRCs when reading data nodes |
917 | * Opt_no_chk_data_crc: do not check CRCs when reading data nodes | |
553dea4d | 918 | * Opt_override_compr: override default compressor |
1e51764a AB |
919 | * Opt_err: just end of array marker |
920 | */ | |
921 | enum { | |
922 | Opt_fast_unmount, | |
923 | Opt_norm_unmount, | |
4793e7c5 AH |
924 | Opt_bulk_read, |
925 | Opt_no_bulk_read, | |
2953e73f AH |
926 | Opt_chk_data_crc, |
927 | Opt_no_chk_data_crc, | |
553dea4d | 928 | Opt_override_compr, |
1e51764a AB |
929 | Opt_err, |
930 | }; | |
931 | ||
a447c093 | 932 | static const match_table_t tokens = { |
1e51764a AB |
933 | {Opt_fast_unmount, "fast_unmount"}, |
934 | {Opt_norm_unmount, "norm_unmount"}, | |
4793e7c5 AH |
935 | {Opt_bulk_read, "bulk_read"}, |
936 | {Opt_no_bulk_read, "no_bulk_read"}, | |
2953e73f AH |
937 | {Opt_chk_data_crc, "chk_data_crc"}, |
938 | {Opt_no_chk_data_crc, "no_chk_data_crc"}, | |
553dea4d | 939 | {Opt_override_compr, "compr=%s"}, |
1e51764a AB |
940 | {Opt_err, NULL}, |
941 | }; | |
942 | ||
8379ea31 AB |
943 | /** |
944 | * parse_standard_option - parse a standard mount option. | |
945 | * @option: the option to parse | |
946 | * | |
947 | * Normally, standard mount options like "sync" are passed to file-systems as | |
948 | * flags. However, when a "rootflags=" kernel boot parameter is used, they may | |
949 | * be present in the options string. This function tries to deal with this | |
950 | * situation and parse standard options. Returns 0 if the option was not | |
951 | * recognized, and the corresponding integer flag if it was. | |
952 | * | |
953 | * UBIFS is only interested in the "sync" option, so do not check for anything | |
954 | * else. | |
955 | */ | |
956 | static int parse_standard_option(const char *option) | |
957 | { | |
958 | ubifs_msg("parse %s", option); | |
959 | if (!strcmp(option, "sync")) | |
960 | return MS_SYNCHRONOUS; | |
961 | return 0; | |
962 | } | |
963 | ||
1e51764a AB |
964 | /** |
965 | * ubifs_parse_options - parse mount parameters. | |
966 | * @c: UBIFS file-system description object | |
967 | * @options: parameters to parse | |
968 | * @is_remount: non-zero if this is FS re-mount | |
969 | * | |
970 | * This function parses UBIFS mount options and returns zero in case success | |
971 | * and a negative error code in case of failure. | |
972 | */ | |
973 | static int ubifs_parse_options(struct ubifs_info *c, char *options, | |
974 | int is_remount) | |
975 | { | |
976 | char *p; | |
977 | substring_t args[MAX_OPT_ARGS]; | |
978 | ||
979 | if (!options) | |
980 | return 0; | |
981 | ||
982 | while ((p = strsep(&options, ","))) { | |
983 | int token; | |
984 | ||
985 | if (!*p) | |
986 | continue; | |
987 | ||
988 | token = match_token(p, tokens, args); | |
989 | switch (token) { | |
27ad2799 AB |
990 | /* |
991 | * %Opt_fast_unmount and %Opt_norm_unmount options are ignored. | |
cb54ef8b | 992 | * We accept them in order to be backward-compatible. But this |
27ad2799 AB |
993 | * should be removed at some point. |
994 | */ | |
1e51764a AB |
995 | case Opt_fast_unmount: |
996 | c->mount_opts.unmount_mode = 2; | |
1e51764a AB |
997 | break; |
998 | case Opt_norm_unmount: | |
999 | c->mount_opts.unmount_mode = 1; | |
1e51764a | 1000 | break; |
4793e7c5 AH |
1001 | case Opt_bulk_read: |
1002 | c->mount_opts.bulk_read = 2; | |
1003 | c->bulk_read = 1; | |
1004 | break; | |
1005 | case Opt_no_bulk_read: | |
1006 | c->mount_opts.bulk_read = 1; | |
1007 | c->bulk_read = 0; | |
1008 | break; | |
2953e73f AH |
1009 | case Opt_chk_data_crc: |
1010 | c->mount_opts.chk_data_crc = 2; | |
1011 | c->no_chk_data_crc = 0; | |
1012 | break; | |
1013 | case Opt_no_chk_data_crc: | |
1014 | c->mount_opts.chk_data_crc = 1; | |
1015 | c->no_chk_data_crc = 1; | |
1016 | break; | |
553dea4d AB |
1017 | case Opt_override_compr: |
1018 | { | |
1019 | char *name = match_strdup(&args[0]); | |
1020 | ||
1021 | if (!name) | |
1022 | return -ENOMEM; | |
1023 | if (!strcmp(name, "none")) | |
1024 | c->mount_opts.compr_type = UBIFS_COMPR_NONE; | |
1025 | else if (!strcmp(name, "lzo")) | |
1026 | c->mount_opts.compr_type = UBIFS_COMPR_LZO; | |
1027 | else if (!strcmp(name, "zlib")) | |
1028 | c->mount_opts.compr_type = UBIFS_COMPR_ZLIB; | |
1029 | else { | |
1030 | ubifs_err("unknown compressor \"%s\"", name); | |
1031 | kfree(name); | |
1032 | return -EINVAL; | |
1033 | } | |
1034 | kfree(name); | |
1035 | c->mount_opts.override_compr = 1; | |
1036 | c->default_compr = c->mount_opts.compr_type; | |
1037 | break; | |
1038 | } | |
1e51764a | 1039 | default: |
8379ea31 AB |
1040 | { |
1041 | unsigned long flag; | |
1042 | struct super_block *sb = c->vfs_sb; | |
1043 | ||
1044 | flag = parse_standard_option(p); | |
1045 | if (!flag) { | |
1046 | ubifs_err("unrecognized mount option \"%s\" " | |
1047 | "or missing value", p); | |
1048 | return -EINVAL; | |
1049 | } | |
1050 | sb->s_flags |= flag; | |
1051 | break; | |
1052 | } | |
1e51764a AB |
1053 | } |
1054 | } | |
1055 | ||
1056 | return 0; | |
1057 | } | |
1058 | ||
1059 | /** | |
1060 | * destroy_journal - destroy journal data structures. | |
1061 | * @c: UBIFS file-system description object | |
1062 | * | |
1063 | * This function destroys journal data structures including those that may have | |
1064 | * been created by recovery functions. | |
1065 | */ | |
1066 | static void destroy_journal(struct ubifs_info *c) | |
1067 | { | |
1068 | while (!list_empty(&c->unclean_leb_list)) { | |
1069 | struct ubifs_unclean_leb *ucleb; | |
1070 | ||
1071 | ucleb = list_entry(c->unclean_leb_list.next, | |
1072 | struct ubifs_unclean_leb, list); | |
1073 | list_del(&ucleb->list); | |
1074 | kfree(ucleb); | |
1075 | } | |
1076 | while (!list_empty(&c->old_buds)) { | |
1077 | struct ubifs_bud *bud; | |
1078 | ||
1079 | bud = list_entry(c->old_buds.next, struct ubifs_bud, list); | |
1080 | list_del(&bud->list); | |
1081 | kfree(bud); | |
1082 | } | |
1083 | ubifs_destroy_idx_gc(c); | |
1084 | ubifs_destroy_size_tree(c); | |
1085 | ubifs_tnc_close(c); | |
1086 | free_buds(c); | |
1087 | } | |
1088 | ||
3477d204 AB |
1089 | /** |
1090 | * bu_init - initialize bulk-read information. | |
1091 | * @c: UBIFS file-system description object | |
1092 | */ | |
1093 | static void bu_init(struct ubifs_info *c) | |
1094 | { | |
1095 | ubifs_assert(c->bulk_read == 1); | |
1096 | ||
1097 | if (c->bu.buf) | |
1098 | return; /* Already initialized */ | |
1099 | ||
1100 | again: | |
1101 | c->bu.buf = kmalloc(c->max_bu_buf_len, GFP_KERNEL | __GFP_NOWARN); | |
1102 | if (!c->bu.buf) { | |
1103 | if (c->max_bu_buf_len > UBIFS_KMALLOC_OK) { | |
1104 | c->max_bu_buf_len = UBIFS_KMALLOC_OK; | |
1105 | goto again; | |
1106 | } | |
1107 | ||
1108 | /* Just disable bulk-read */ | |
1109 | ubifs_warn("Cannot allocate %d bytes of memory for bulk-read, " | |
1110 | "disabling it", c->max_bu_buf_len); | |
1111 | c->mount_opts.bulk_read = 1; | |
1112 | c->bulk_read = 0; | |
1113 | return; | |
1114 | } | |
1115 | } | |
1116 | ||
57a450e9 AB |
1117 | /** |
1118 | * check_free_space - check if there is enough free space to mount. | |
1119 | * @c: UBIFS file-system description object | |
1120 | * | |
1121 | * This function makes sure UBIFS has enough free space to be mounted in | |
1122 | * read/write mode. UBIFS must always have some free space to allow deletions. | |
1123 | */ | |
1124 | static int check_free_space(struct ubifs_info *c) | |
1125 | { | |
1126 | ubifs_assert(c->dark_wm > 0); | |
1127 | if (c->lst.total_free + c->lst.total_dirty < c->dark_wm) { | |
1128 | ubifs_err("insufficient free space to mount in read/write mode"); | |
1129 | dbg_dump_budg(c); | |
1130 | dbg_dump_lprops(c); | |
a2b9df3f | 1131 | return -ENOSPC; |
57a450e9 AB |
1132 | } |
1133 | return 0; | |
1134 | } | |
1135 | ||
1e51764a AB |
1136 | /** |
1137 | * mount_ubifs - mount UBIFS file-system. | |
1138 | * @c: UBIFS file-system description object | |
1139 | * | |
1140 | * This function mounts UBIFS file system. Returns zero in case of success and | |
1141 | * a negative error code in case of failure. | |
1142 | * | |
1143 | * Note, the function does not de-allocate resources it it fails half way | |
1144 | * through, and the caller has to do this instead. | |
1145 | */ | |
1146 | static int mount_ubifs(struct ubifs_info *c) | |
1147 | { | |
2ef13294 | 1148 | int err; |
1e51764a AB |
1149 | long long x; |
1150 | size_t sz; | |
1151 | ||
2ef13294 | 1152 | c->ro_mount = !!(c->vfs_sb->s_flags & MS_RDONLY); |
1e51764a AB |
1153 | err = init_constants_early(c); |
1154 | if (err) | |
1155 | return err; | |
1156 | ||
17c2f9f8 AB |
1157 | err = ubifs_debugging_init(c); |
1158 | if (err) | |
1159 | return err; | |
1e51764a AB |
1160 | |
1161 | err = check_volume_empty(c); | |
1162 | if (err) | |
1163 | goto out_free; | |
1164 | ||
2ef13294 | 1165 | if (c->empty && (c->ro_mount || c->ro_media)) { |
1e51764a AB |
1166 | /* |
1167 | * This UBI volume is empty, and read-only, or the file system | |
1168 | * is mounted read-only - we cannot format it. | |
1169 | */ | |
1170 | ubifs_err("can't format empty UBI volume: read-only %s", | |
1171 | c->ro_media ? "UBI volume" : "mount"); | |
1172 | err = -EROFS; | |
1173 | goto out_free; | |
1174 | } | |
1175 | ||
2ef13294 | 1176 | if (c->ro_media && !c->ro_mount) { |
1e51764a AB |
1177 | ubifs_err("cannot mount read-write - read-only media"); |
1178 | err = -EROFS; | |
1179 | goto out_free; | |
1180 | } | |
1181 | ||
1182 | /* | |
1183 | * The requirement for the buffer is that it should fit indexing B-tree | |
1184 | * height amount of integers. We assume the height if the TNC tree will | |
1185 | * never exceed 64. | |
1186 | */ | |
1187 | err = -ENOMEM; | |
1188 | c->bottom_up_buf = kmalloc(BOTTOM_UP_HEIGHT * sizeof(int), GFP_KERNEL); | |
1189 | if (!c->bottom_up_buf) | |
1190 | goto out_free; | |
1191 | ||
1192 | c->sbuf = vmalloc(c->leb_size); | |
1193 | if (!c->sbuf) | |
1194 | goto out_free; | |
1195 | ||
2ef13294 | 1196 | if (!c->ro_mount) { |
1e51764a AB |
1197 | c->ileb_buf = vmalloc(c->leb_size); |
1198 | if (!c->ileb_buf) | |
1199 | goto out_free; | |
1200 | } | |
1201 | ||
3477d204 AB |
1202 | if (c->bulk_read == 1) |
1203 | bu_init(c); | |
1204 | ||
1205 | /* | |
1206 | * We have to check all CRCs, even for data nodes, when we mount the FS | |
1207 | * (specifically, when we are replaying). | |
1208 | */ | |
2953e73f AH |
1209 | c->always_chk_crc = 1; |
1210 | ||
1e51764a AB |
1211 | err = ubifs_read_superblock(c); |
1212 | if (err) | |
1213 | goto out_free; | |
1214 | ||
1215 | /* | |
553dea4d | 1216 | * Make sure the compressor which is set as default in the superblock |
57a450e9 | 1217 | * or overridden by mount options is actually compiled in. |
1e51764a AB |
1218 | */ |
1219 | if (!ubifs_compr_present(c->default_compr)) { | |
553dea4d AB |
1220 | ubifs_err("'compressor \"%s\" is not compiled in", |
1221 | ubifs_compr_name(c->default_compr)); | |
8eec2f36 | 1222 | err = -ENOTSUPP; |
553dea4d | 1223 | goto out_free; |
1e51764a AB |
1224 | } |
1225 | ||
79807d07 | 1226 | err = init_constants_sb(c); |
1e51764a | 1227 | if (err) |
17c2f9f8 | 1228 | goto out_free; |
1e51764a AB |
1229 | |
1230 | sz = ALIGN(c->max_idx_node_sz, c->min_io_size); | |
1231 | sz = ALIGN(sz + c->max_idx_node_sz, c->min_io_size); | |
1232 | c->cbuf = kmalloc(sz, GFP_NOFS); | |
1233 | if (!c->cbuf) { | |
1234 | err = -ENOMEM; | |
17c2f9f8 | 1235 | goto out_free; |
1e51764a AB |
1236 | } |
1237 | ||
0855f310 | 1238 | sprintf(c->bgt_name, BGT_NAME_PATTERN, c->vi.ubi_num, c->vi.vol_id); |
2ef13294 | 1239 | if (!c->ro_mount) { |
1e51764a AB |
1240 | err = alloc_wbufs(c); |
1241 | if (err) | |
1242 | goto out_cbuf; | |
1243 | ||
1244 | /* Create background thread */ | |
fcabb347 | 1245 | c->bgt = kthread_create(ubifs_bg_thread, c, "%s", c->bgt_name); |
1e51764a AB |
1246 | if (IS_ERR(c->bgt)) { |
1247 | err = PTR_ERR(c->bgt); | |
1248 | c->bgt = NULL; | |
1249 | ubifs_err("cannot spawn \"%s\", error %d", | |
1250 | c->bgt_name, err); | |
1251 | goto out_wbufs; | |
1252 | } | |
1253 | wake_up_process(c->bgt); | |
1254 | } | |
1255 | ||
1256 | err = ubifs_read_master(c); | |
1257 | if (err) | |
1258 | goto out_master; | |
1259 | ||
79807d07 AB |
1260 | init_constants_master(c); |
1261 | ||
1e51764a AB |
1262 | if ((c->mst_node->flags & cpu_to_le32(UBIFS_MST_DIRTY)) != 0) { |
1263 | ubifs_msg("recovery needed"); | |
1264 | c->need_recovery = 1; | |
2ef13294 | 1265 | if (!c->ro_mount) { |
1e51764a AB |
1266 | err = ubifs_recover_inl_heads(c, c->sbuf); |
1267 | if (err) | |
1268 | goto out_master; | |
1269 | } | |
2ef13294 | 1270 | } else if (!c->ro_mount) { |
1e51764a AB |
1271 | /* |
1272 | * Set the "dirty" flag so that if we reboot uncleanly we | |
1273 | * will notice this immediately on the next mount. | |
1274 | */ | |
1275 | c->mst_node->flags |= cpu_to_le32(UBIFS_MST_DIRTY); | |
1276 | err = ubifs_write_master(c); | |
1277 | if (err) | |
1278 | goto out_master; | |
1279 | } | |
1280 | ||
2ef13294 | 1281 | err = ubifs_lpt_init(c, 1, !c->ro_mount); |
1e51764a AB |
1282 | if (err) |
1283 | goto out_lpt; | |
1284 | ||
1285 | err = dbg_check_idx_size(c, c->old_idx_sz); | |
1286 | if (err) | |
1287 | goto out_lpt; | |
1288 | ||
1289 | err = ubifs_replay_journal(c); | |
1290 | if (err) | |
1291 | goto out_journal; | |
1292 | ||
1fb8bd01 AB |
1293 | /* Calculate 'min_idx_lebs' after journal replay */ |
1294 | c->min_idx_lebs = ubifs_calc_min_idx_lebs(c); | |
1295 | ||
2ef13294 | 1296 | err = ubifs_mount_orphans(c, c->need_recovery, c->ro_mount); |
1e51764a AB |
1297 | if (err) |
1298 | goto out_orphans; | |
1299 | ||
2ef13294 | 1300 | if (!c->ro_mount) { |
1e51764a AB |
1301 | int lnum; |
1302 | ||
57a450e9 AB |
1303 | err = check_free_space(c); |
1304 | if (err) | |
1e51764a | 1305 | goto out_orphans; |
1e51764a AB |
1306 | |
1307 | /* Check for enough log space */ | |
1308 | lnum = c->lhead_lnum + 1; | |
1309 | if (lnum >= UBIFS_LOG_LNUM + c->log_lebs) | |
1310 | lnum = UBIFS_LOG_LNUM; | |
1311 | if (lnum == c->ltail_lnum) { | |
1312 | err = ubifs_consolidate_log(c); | |
1313 | if (err) | |
1314 | goto out_orphans; | |
1315 | } | |
1316 | ||
1317 | if (c->need_recovery) { | |
1318 | err = ubifs_recover_size(c); | |
1319 | if (err) | |
1320 | goto out_orphans; | |
1321 | err = ubifs_rcvry_gc_commit(c); | |
276de5d2 AB |
1322 | if (err) |
1323 | goto out_orphans; | |
b4978e94 | 1324 | } else { |
1e51764a | 1325 | err = take_gc_lnum(c); |
b4978e94 AB |
1326 | if (err) |
1327 | goto out_orphans; | |
1328 | ||
1329 | /* | |
1330 | * GC LEB may contain garbage if there was an unclean | |
1331 | * reboot, and it should be un-mapped. | |
1332 | */ | |
1333 | err = ubifs_leb_unmap(c, c->gc_lnum); | |
1334 | if (err) | |
c18de72f | 1335 | goto out_orphans; |
b4978e94 | 1336 | } |
1e51764a AB |
1337 | |
1338 | err = dbg_check_lprops(c); | |
1339 | if (err) | |
1340 | goto out_orphans; | |
1341 | } else if (c->need_recovery) { | |
1342 | err = ubifs_recover_size(c); | |
1343 | if (err) | |
1344 | goto out_orphans; | |
b4978e94 AB |
1345 | } else { |
1346 | /* | |
1347 | * Even if we mount read-only, we have to set space in GC LEB | |
1348 | * to proper value because this affects UBIFS free space | |
1349 | * reporting. We do not want to have a situation when | |
1350 | * re-mounting from R/O to R/W changes amount of free space. | |
1351 | */ | |
1352 | err = take_gc_lnum(c); | |
1353 | if (err) | |
1354 | goto out_orphans; | |
1e51764a AB |
1355 | } |
1356 | ||
1357 | spin_lock(&ubifs_infos_lock); | |
1358 | list_add_tail(&c->infos_list, &ubifs_infos); | |
1359 | spin_unlock(&ubifs_infos_lock); | |
1360 | ||
1361 | if (c->need_recovery) { | |
2ef13294 | 1362 | if (c->ro_mount) |
1e51764a AB |
1363 | ubifs_msg("recovery deferred"); |
1364 | else { | |
1365 | c->need_recovery = 0; | |
1366 | ubifs_msg("recovery completed"); | |
b221337a AB |
1367 | /* |
1368 | * GC LEB has to be empty and taken at this point. But | |
1369 | * the journal head LEBs may also be accounted as | |
1370 | * "empty taken" if they are empty. | |
1371 | */ | |
1372 | ubifs_assert(c->lst.taken_empty_lebs > 0); | |
1e51764a | 1373 | } |
6ba87c9b | 1374 | } else |
b221337a | 1375 | ubifs_assert(c->lst.taken_empty_lebs > 0); |
1e51764a | 1376 | |
6ba87c9b | 1377 | err = dbg_check_filesystem(c); |
552ff317 AB |
1378 | if (err) |
1379 | goto out_infos; | |
1380 | ||
6ba87c9b | 1381 | err = dbg_debugfs_init_fs(c); |
1e51764a AB |
1382 | if (err) |
1383 | goto out_infos; | |
1384 | ||
2953e73f AH |
1385 | c->always_chk_crc = 0; |
1386 | ||
ce769caa AB |
1387 | ubifs_msg("mounted UBI device %d, volume %d, name \"%s\"", |
1388 | c->vi.ubi_num, c->vi.vol_id, c->vi.name); | |
2ef13294 | 1389 | if (c->ro_mount) |
1e51764a AB |
1390 | ubifs_msg("mounted read-only"); |
1391 | x = (long long)c->main_lebs * c->leb_size; | |
948cfb21 AB |
1392 | ubifs_msg("file system size: %lld bytes (%lld KiB, %lld MiB, %d " |
1393 | "LEBs)", x, x >> 10, x >> 20, c->main_lebs); | |
1e51764a | 1394 | x = (long long)c->log_lebs * c->leb_size + c->max_bud_bytes; |
948cfb21 AB |
1395 | ubifs_msg("journal size: %lld bytes (%lld KiB, %lld MiB, %d " |
1396 | "LEBs)", x, x >> 10, x >> 20, c->log_lebs + c->max_bud_cnt); | |
963f0cf6 AB |
1397 | ubifs_msg("media format: w%d/r%d (latest is w%d/r%d)", |
1398 | c->fmt_version, c->ro_compat_version, | |
1399 | UBIFS_FORMAT_VERSION, UBIFS_RO_COMPAT_VERSION); | |
948cfb21 | 1400 | ubifs_msg("default compressor: %s", ubifs_compr_name(c->default_compr)); |
fae7fb29 | 1401 | ubifs_msg("reserved for root: %llu bytes (%llu KiB)", |
948cfb21 | 1402 | c->report_rp_size, c->report_rp_size >> 10); |
1e51764a AB |
1403 | |
1404 | dbg_msg("compiled on: " __DATE__ " at " __TIME__); | |
1405 | dbg_msg("min. I/O unit size: %d bytes", c->min_io_size); | |
1406 | dbg_msg("LEB size: %d bytes (%d KiB)", | |
948cfb21 | 1407 | c->leb_size, c->leb_size >> 10); |
1e51764a AB |
1408 | dbg_msg("data journal heads: %d", |
1409 | c->jhead_cnt - NONDATA_JHEADS_CNT); | |
7f2f4e72 | 1410 | dbg_msg("UUID: %pUB", c->uuid); |
1e51764a AB |
1411 | dbg_msg("big_lpt %d", c->big_lpt); |
1412 | dbg_msg("log LEBs: %d (%d - %d)", | |
1413 | c->log_lebs, UBIFS_LOG_LNUM, c->log_last); | |
1414 | dbg_msg("LPT area LEBs: %d (%d - %d)", | |
1415 | c->lpt_lebs, c->lpt_first, c->lpt_last); | |
1416 | dbg_msg("orphan area LEBs: %d (%d - %d)", | |
1417 | c->orph_lebs, c->orph_first, c->orph_last); | |
1418 | dbg_msg("main area LEBs: %d (%d - %d)", | |
1419 | c->main_lebs, c->main_first, c->leb_cnt - 1); | |
1420 | dbg_msg("index LEBs: %d", c->lst.idx_lebs); | |
1421 | dbg_msg("total index bytes: %lld (%lld KiB, %lld MiB)", | |
1422 | c->old_idx_sz, c->old_idx_sz >> 10, c->old_idx_sz >> 20); | |
1423 | dbg_msg("key hash type: %d", c->key_hash_type); | |
1424 | dbg_msg("tree fanout: %d", c->fanout); | |
1425 | dbg_msg("reserved GC LEB: %d", c->gc_lnum); | |
1426 | dbg_msg("first main LEB: %d", c->main_first); | |
8e5033ad AB |
1427 | dbg_msg("max. znode size %d", c->max_znode_sz); |
1428 | dbg_msg("max. index node size %d", c->max_idx_node_sz); | |
1429 | dbg_msg("node sizes: data %zu, inode %zu, dentry %zu", | |
1430 | UBIFS_DATA_NODE_SZ, UBIFS_INO_NODE_SZ, UBIFS_DENT_NODE_SZ); | |
1431 | dbg_msg("node sizes: trun %zu, sb %zu, master %zu", | |
1432 | UBIFS_TRUN_NODE_SZ, UBIFS_SB_NODE_SZ, UBIFS_MST_NODE_SZ); | |
1433 | dbg_msg("node sizes: ref %zu, cmt. start %zu, orph %zu", | |
1434 | UBIFS_REF_NODE_SZ, UBIFS_CS_NODE_SZ, UBIFS_ORPH_NODE_SZ); | |
1435 | dbg_msg("max. node sizes: data %zu, inode %zu dentry %zu", | |
1436 | UBIFS_MAX_DATA_NODE_SZ, UBIFS_MAX_INO_NODE_SZ, | |
1437 | UBIFS_MAX_DENT_NODE_SZ); | |
1e51764a AB |
1438 | dbg_msg("dead watermark: %d", c->dead_wm); |
1439 | dbg_msg("dark watermark: %d", c->dark_wm); | |
8e5033ad | 1440 | dbg_msg("LEB overhead: %d", c->leb_overhead); |
1e51764a AB |
1441 | x = (long long)c->main_lebs * c->dark_wm; |
1442 | dbg_msg("max. dark space: %lld (%lld KiB, %lld MiB)", | |
1443 | x, x >> 10, x >> 20); | |
1444 | dbg_msg("maximum bud bytes: %lld (%lld KiB, %lld MiB)", | |
1445 | c->max_bud_bytes, c->max_bud_bytes >> 10, | |
1446 | c->max_bud_bytes >> 20); | |
1447 | dbg_msg("BG commit bud bytes: %lld (%lld KiB, %lld MiB)", | |
1448 | c->bg_bud_bytes, c->bg_bud_bytes >> 10, | |
1449 | c->bg_bud_bytes >> 20); | |
1450 | dbg_msg("current bud bytes %lld (%lld KiB, %lld MiB)", | |
1451 | c->bud_bytes, c->bud_bytes >> 10, c->bud_bytes >> 20); | |
1452 | dbg_msg("max. seq. number: %llu", c->max_sqnum); | |
1453 | dbg_msg("commit number: %llu", c->cmt_no); | |
1454 | ||
1455 | return 0; | |
1456 | ||
1457 | out_infos: | |
1458 | spin_lock(&ubifs_infos_lock); | |
1459 | list_del(&c->infos_list); | |
1460 | spin_unlock(&ubifs_infos_lock); | |
1461 | out_orphans: | |
1462 | free_orphans(c); | |
1463 | out_journal: | |
1464 | destroy_journal(c); | |
1465 | out_lpt: | |
1466 | ubifs_lpt_free(c, 0); | |
1467 | out_master: | |
1468 | kfree(c->mst_node); | |
1469 | kfree(c->rcvrd_mst_node); | |
1470 | if (c->bgt) | |
1471 | kthread_stop(c->bgt); | |
1472 | out_wbufs: | |
1473 | free_wbufs(c); | |
1474 | out_cbuf: | |
1475 | kfree(c->cbuf); | |
1e51764a | 1476 | out_free: |
3477d204 | 1477 | kfree(c->bu.buf); |
1e51764a AB |
1478 | vfree(c->ileb_buf); |
1479 | vfree(c->sbuf); | |
1480 | kfree(c->bottom_up_buf); | |
17c2f9f8 | 1481 | ubifs_debugging_exit(c); |
1e51764a AB |
1482 | return err; |
1483 | } | |
1484 | ||
1485 | /** | |
1486 | * ubifs_umount - un-mount UBIFS file-system. | |
1487 | * @c: UBIFS file-system description object | |
1488 | * | |
1489 | * Note, this function is called to free allocated resourced when un-mounting, | |
1490 | * as well as free resources when an error occurred while we were half way | |
1491 | * through mounting (error path cleanup function). So it has to make sure the | |
1492 | * resource was actually allocated before freeing it. | |
1493 | */ | |
1494 | static void ubifs_umount(struct ubifs_info *c) | |
1495 | { | |
1496 | dbg_gen("un-mounting UBI device %d, volume %d", c->vi.ubi_num, | |
1497 | c->vi.vol_id); | |
1498 | ||
552ff317 | 1499 | dbg_debugfs_exit_fs(c); |
1e51764a AB |
1500 | spin_lock(&ubifs_infos_lock); |
1501 | list_del(&c->infos_list); | |
1502 | spin_unlock(&ubifs_infos_lock); | |
1503 | ||
1504 | if (c->bgt) | |
1505 | kthread_stop(c->bgt); | |
1506 | ||
1507 | destroy_journal(c); | |
1508 | free_wbufs(c); | |
1509 | free_orphans(c); | |
1510 | ubifs_lpt_free(c, 0); | |
1511 | ||
1512 | kfree(c->cbuf); | |
1513 | kfree(c->rcvrd_mst_node); | |
1514 | kfree(c->mst_node); | |
3477d204 AB |
1515 | kfree(c->bu.buf); |
1516 | vfree(c->ileb_buf); | |
1e51764a AB |
1517 | vfree(c->sbuf); |
1518 | kfree(c->bottom_up_buf); | |
17c2f9f8 | 1519 | ubifs_debugging_exit(c); |
1e51764a AB |
1520 | } |
1521 | ||
1522 | /** | |
1523 | * ubifs_remount_rw - re-mount in read-write mode. | |
1524 | * @c: UBIFS file-system description object | |
1525 | * | |
1526 | * UBIFS avoids allocating many unnecessary resources when mounted in read-only | |
1527 | * mode. This function allocates the needed resources and re-mounts UBIFS in | |
1528 | * read-write mode. | |
1529 | */ | |
1530 | static int ubifs_remount_rw(struct ubifs_info *c) | |
1531 | { | |
1532 | int err, lnum; | |
1533 | ||
963f0cf6 AB |
1534 | if (c->rw_incompat) { |
1535 | ubifs_err("the file-system is not R/W-compatible"); | |
1536 | ubifs_msg("on-flash format version is w%d/r%d, but software " | |
1537 | "only supports up to version w%d/r%d", c->fmt_version, | |
1538 | c->ro_compat_version, UBIFS_FORMAT_VERSION, | |
1539 | UBIFS_RO_COMPAT_VERSION); | |
1540 | return -EROFS; | |
1541 | } | |
1542 | ||
1e51764a | 1543 | mutex_lock(&c->umount_mutex); |
84abf972 | 1544 | dbg_save_space_info(c); |
1e51764a | 1545 | c->remounting_rw = 1; |
2953e73f | 1546 | c->always_chk_crc = 1; |
1e51764a | 1547 | |
57a450e9 AB |
1548 | err = check_free_space(c); |
1549 | if (err) | |
1e51764a | 1550 | goto out; |
1e51764a AB |
1551 | |
1552 | if (c->old_leb_cnt != c->leb_cnt) { | |
1553 | struct ubifs_sb_node *sup; | |
1554 | ||
1555 | sup = ubifs_read_sb_node(c); | |
1556 | if (IS_ERR(sup)) { | |
1557 | err = PTR_ERR(sup); | |
1558 | goto out; | |
1559 | } | |
1560 | sup->leb_cnt = cpu_to_le32(c->leb_cnt); | |
1561 | err = ubifs_write_sb_node(c, sup); | |
1562 | if (err) | |
1563 | goto out; | |
1564 | } | |
1565 | ||
1566 | if (c->need_recovery) { | |
1567 | ubifs_msg("completing deferred recovery"); | |
1568 | err = ubifs_write_rcvrd_mst_node(c); | |
1569 | if (err) | |
1570 | goto out; | |
1571 | err = ubifs_recover_size(c); | |
1572 | if (err) | |
1573 | goto out; | |
1574 | err = ubifs_clean_lebs(c, c->sbuf); | |
1575 | if (err) | |
1576 | goto out; | |
1577 | err = ubifs_recover_inl_heads(c, c->sbuf); | |
1578 | if (err) | |
1579 | goto out; | |
49d128aa AH |
1580 | } else { |
1581 | /* A readonly mount is not allowed to have orphans */ | |
1582 | ubifs_assert(c->tot_orphans == 0); | |
1583 | err = ubifs_clear_orphans(c); | |
1584 | if (err) | |
1585 | goto out; | |
1e51764a AB |
1586 | } |
1587 | ||
1588 | if (!(c->mst_node->flags & cpu_to_le32(UBIFS_MST_DIRTY))) { | |
1589 | c->mst_node->flags |= cpu_to_le32(UBIFS_MST_DIRTY); | |
1590 | err = ubifs_write_master(c); | |
1591 | if (err) | |
1592 | goto out; | |
1593 | } | |
1594 | ||
1595 | c->ileb_buf = vmalloc(c->leb_size); | |
1596 | if (!c->ileb_buf) { | |
1597 | err = -ENOMEM; | |
1598 | goto out; | |
1599 | } | |
1600 | ||
1601 | err = ubifs_lpt_init(c, 0, 1); | |
1602 | if (err) | |
1603 | goto out; | |
1604 | ||
1605 | err = alloc_wbufs(c); | |
1606 | if (err) | |
1607 | goto out; | |
1608 | ||
1609 | ubifs_create_buds_lists(c); | |
1610 | ||
1611 | /* Create background thread */ | |
fcabb347 | 1612 | c->bgt = kthread_create(ubifs_bg_thread, c, "%s", c->bgt_name); |
1e51764a AB |
1613 | if (IS_ERR(c->bgt)) { |
1614 | err = PTR_ERR(c->bgt); | |
1615 | c->bgt = NULL; | |
1616 | ubifs_err("cannot spawn \"%s\", error %d", | |
1617 | c->bgt_name, err); | |
2953e73f | 1618 | goto out; |
1e51764a AB |
1619 | } |
1620 | wake_up_process(c->bgt); | |
1621 | ||
1622 | c->orph_buf = vmalloc(c->leb_size); | |
2953e73f AH |
1623 | if (!c->orph_buf) { |
1624 | err = -ENOMEM; | |
1625 | goto out; | |
1626 | } | |
1e51764a AB |
1627 | |
1628 | /* Check for enough log space */ | |
1629 | lnum = c->lhead_lnum + 1; | |
1630 | if (lnum >= UBIFS_LOG_LNUM + c->log_lebs) | |
1631 | lnum = UBIFS_LOG_LNUM; | |
1632 | if (lnum == c->ltail_lnum) { | |
1633 | err = ubifs_consolidate_log(c); | |
1634 | if (err) | |
1635 | goto out; | |
1636 | } | |
1637 | ||
1638 | if (c->need_recovery) | |
1639 | err = ubifs_rcvry_gc_commit(c); | |
1640 | else | |
b4978e94 | 1641 | err = ubifs_leb_unmap(c, c->gc_lnum); |
1e51764a AB |
1642 | if (err) |
1643 | goto out; | |
1644 | ||
1645 | if (c->need_recovery) { | |
1646 | c->need_recovery = 0; | |
1647 | ubifs_msg("deferred recovery completed"); | |
1648 | } | |
1649 | ||
1650 | dbg_gen("re-mounted read-write"); | |
2ef13294 | 1651 | c->ro_mount = 0; |
1e51764a | 1652 | c->remounting_rw = 0; |
2953e73f | 1653 | c->always_chk_crc = 0; |
84abf972 | 1654 | err = dbg_check_space_info(c); |
1e51764a | 1655 | mutex_unlock(&c->umount_mutex); |
84abf972 | 1656 | return err; |
1e51764a AB |
1657 | |
1658 | out: | |
1659 | vfree(c->orph_buf); | |
1660 | c->orph_buf = NULL; | |
1661 | if (c->bgt) { | |
1662 | kthread_stop(c->bgt); | |
1663 | c->bgt = NULL; | |
1664 | } | |
1665 | free_wbufs(c); | |
1666 | vfree(c->ileb_buf); | |
1667 | c->ileb_buf = NULL; | |
1668 | ubifs_lpt_free(c, 1); | |
1669 | c->remounting_rw = 0; | |
2953e73f | 1670 | c->always_chk_crc = 0; |
1e51764a AB |
1671 | mutex_unlock(&c->umount_mutex); |
1672 | return err; | |
1673 | } | |
1674 | ||
1e51764a AB |
1675 | /** |
1676 | * ubifs_remount_ro - re-mount in read-only mode. | |
1677 | * @c: UBIFS file-system description object | |
1678 | * | |
84abf972 AB |
1679 | * We assume VFS has stopped writing. Possibly the background thread could be |
1680 | * running a commit, however kthread_stop will wait in that case. | |
1e51764a AB |
1681 | */ |
1682 | static void ubifs_remount_ro(struct ubifs_info *c) | |
1683 | { | |
1684 | int i, err; | |
1685 | ||
1686 | ubifs_assert(!c->need_recovery); | |
2ef13294 | 1687 | ubifs_assert(!c->ro_mount); |
e4d9b6cb | 1688 | |
1e51764a AB |
1689 | mutex_lock(&c->umount_mutex); |
1690 | if (c->bgt) { | |
1691 | kthread_stop(c->bgt); | |
1692 | c->bgt = NULL; | |
1693 | } | |
1694 | ||
84abf972 AB |
1695 | dbg_save_space_info(c); |
1696 | ||
39037559 | 1697 | for (i = 0; i < c->jhead_cnt; i++) |
1e51764a | 1698 | ubifs_wbuf_sync(&c->jheads[i].wbuf); |
1e51764a | 1699 | |
e4d9b6cb AB |
1700 | c->mst_node->flags &= ~cpu_to_le32(UBIFS_MST_DIRTY); |
1701 | c->mst_node->flags |= cpu_to_le32(UBIFS_MST_NO_ORPHS); | |
1702 | c->mst_node->gc_lnum = cpu_to_le32(c->gc_lnum); | |
1703 | err = ubifs_write_master(c); | |
1704 | if (err) | |
1705 | ubifs_ro_mode(c, err); | |
1706 | ||
1e51764a AB |
1707 | free_wbufs(c); |
1708 | vfree(c->orph_buf); | |
1709 | c->orph_buf = NULL; | |
1710 | vfree(c->ileb_buf); | |
1711 | c->ileb_buf = NULL; | |
1712 | ubifs_lpt_free(c, 1); | |
2ef13294 | 1713 | c->ro_mount = 1; |
84abf972 AB |
1714 | err = dbg_check_space_info(c); |
1715 | if (err) | |
1716 | ubifs_ro_mode(c, err); | |
1e51764a AB |
1717 | mutex_unlock(&c->umount_mutex); |
1718 | } | |
1719 | ||
1720 | static void ubifs_put_super(struct super_block *sb) | |
1721 | { | |
1722 | int i; | |
1723 | struct ubifs_info *c = sb->s_fs_info; | |
1724 | ||
1725 | ubifs_msg("un-mount UBI device %d, volume %d", c->vi.ubi_num, | |
1726 | c->vi.vol_id); | |
6cfd0148 | 1727 | |
1e51764a AB |
1728 | /* |
1729 | * The following asserts are only valid if there has not been a failure | |
1730 | * of the media. For example, there will be dirty inodes if we failed | |
1731 | * to write them back because of I/O errors. | |
1732 | */ | |
1733 | ubifs_assert(atomic_long_read(&c->dirty_pg_cnt) == 0); | |
1734 | ubifs_assert(c->budg_idx_growth == 0); | |
7d32c2bb | 1735 | ubifs_assert(c->budg_dd_growth == 0); |
1e51764a AB |
1736 | ubifs_assert(c->budg_data_growth == 0); |
1737 | ||
1738 | /* | |
1739 | * The 'c->umount_lock' prevents races between UBIFS memory shrinker | |
1740 | * and file system un-mount. Namely, it prevents the shrinker from | |
1741 | * picking this superblock for shrinking - it will be just skipped if | |
1742 | * the mutex is locked. | |
1743 | */ | |
1744 | mutex_lock(&c->umount_mutex); | |
2ef13294 | 1745 | if (!c->ro_mount) { |
1e51764a AB |
1746 | /* |
1747 | * First of all kill the background thread to make sure it does | |
1748 | * not interfere with un-mounting and freeing resources. | |
1749 | */ | |
1750 | if (c->bgt) { | |
1751 | kthread_stop(c->bgt); | |
1752 | c->bgt = NULL; | |
1753 | } | |
1754 | ||
1e51764a | 1755 | /* |
2680d722 | 1756 | * On fatal errors c->ro_error is set to 1, in which case we do |
1e51764a AB |
1757 | * not write the master node. |
1758 | */ | |
2680d722 | 1759 | if (!c->ro_error) { |
2ef13294 AB |
1760 | int err; |
1761 | ||
1762 | /* Synchronize write-buffers */ | |
39037559 AB |
1763 | for (i = 0; i < c->jhead_cnt; i++) |
1764 | ubifs_wbuf_sync(&c->jheads[i].wbuf); | |
2ef13294 | 1765 | |
1e51764a AB |
1766 | /* |
1767 | * We are being cleanly unmounted which means the | |
1768 | * orphans were killed - indicate this in the master | |
1769 | * node. Also save the reserved GC LEB number. | |
1770 | */ | |
1e51764a AB |
1771 | c->mst_node->flags &= ~cpu_to_le32(UBIFS_MST_DIRTY); |
1772 | c->mst_node->flags |= cpu_to_le32(UBIFS_MST_NO_ORPHS); | |
1773 | c->mst_node->gc_lnum = cpu_to_le32(c->gc_lnum); | |
1774 | err = ubifs_write_master(c); | |
1775 | if (err) | |
1776 | /* | |
1777 | * Recovery will attempt to fix the master area | |
1778 | * next mount, so we just print a message and | |
1779 | * continue to unmount normally. | |
1780 | */ | |
1781 | ubifs_err("failed to write master node, " | |
1782 | "error %d", err); | |
3601ba27 AB |
1783 | } else { |
1784 | for (i = 0; i < c->jhead_cnt; i++) | |
1785 | /* Make sure write-buffer timers are canceled */ | |
1786 | hrtimer_cancel(&c->jheads[i].wbuf.timer); | |
1e51764a AB |
1787 | } |
1788 | } | |
1789 | ||
1790 | ubifs_umount(c); | |
1791 | bdi_destroy(&c->bdi); | |
1792 | ubi_close_volume(c->ubi); | |
1793 | mutex_unlock(&c->umount_mutex); | |
1794 | kfree(c); | |
1795 | } | |
1796 | ||
1797 | static int ubifs_remount_fs(struct super_block *sb, int *flags, char *data) | |
1798 | { | |
1799 | int err; | |
1800 | struct ubifs_info *c = sb->s_fs_info; | |
1801 | ||
1802 | dbg_gen("old flags %#lx, new flags %#x", sb->s_flags, *flags); | |
1803 | ||
1804 | err = ubifs_parse_options(c, data, 1); | |
1805 | if (err) { | |
1806 | ubifs_err("invalid or unknown remount parameter"); | |
1807 | return err; | |
1808 | } | |
3477d204 | 1809 | |
2ef13294 | 1810 | if (c->ro_mount && !(*flags & MS_RDONLY)) { |
2680d722 AB |
1811 | if (c->ro_error) { |
1812 | ubifs_msg("cannot re-mount R/W due to prior errors"); | |
1813 | return -EROFS; | |
1814 | } | |
e4d9b6cb | 1815 | if (c->ro_media) { |
2680d722 | 1816 | ubifs_msg("cannot re-mount R/W - UBI volume is R/O"); |
a2b9df3f | 1817 | return -EROFS; |
e4d9b6cb | 1818 | } |
1e51764a | 1819 | err = ubifs_remount_rw(c); |
e9d6bbc4 | 1820 | if (err) |
1e51764a | 1821 | return err; |
2ef13294 | 1822 | } else if (!c->ro_mount && (*flags & MS_RDONLY)) { |
2680d722 AB |
1823 | if (c->ro_error) { |
1824 | ubifs_msg("cannot re-mount R/O due to prior errors"); | |
a2b9df3f | 1825 | return -EROFS; |
b466f17d | 1826 | } |
1e51764a | 1827 | ubifs_remount_ro(c); |
b466f17d | 1828 | } |
1e51764a | 1829 | |
3477d204 AB |
1830 | if (c->bulk_read == 1) |
1831 | bu_init(c); | |
1832 | else { | |
1833 | dbg_gen("disable bulk-read"); | |
1834 | kfree(c->bu.buf); | |
1835 | c->bu.buf = NULL; | |
1836 | } | |
1837 | ||
b221337a | 1838 | ubifs_assert(c->lst.taken_empty_lebs > 0); |
1e51764a AB |
1839 | return 0; |
1840 | } | |
1841 | ||
e8b81566 | 1842 | const struct super_operations ubifs_super_operations = { |
1e51764a AB |
1843 | .alloc_inode = ubifs_alloc_inode, |
1844 | .destroy_inode = ubifs_destroy_inode, | |
1845 | .put_super = ubifs_put_super, | |
1846 | .write_inode = ubifs_write_inode, | |
d640e1b5 | 1847 | .evict_inode = ubifs_evict_inode, |
1e51764a AB |
1848 | .statfs = ubifs_statfs, |
1849 | .dirty_inode = ubifs_dirty_inode, | |
1850 | .remount_fs = ubifs_remount_fs, | |
1851 | .show_options = ubifs_show_options, | |
1852 | .sync_fs = ubifs_sync_fs, | |
1853 | }; | |
1854 | ||
1855 | /** | |
1856 | * open_ubi - parse UBI device name string and open the UBI device. | |
1857 | * @name: UBI volume name | |
1858 | * @mode: UBI volume open mode | |
1859 | * | |
9722324e CC |
1860 | * The primary method of mounting UBIFS is by specifying the UBI volume |
1861 | * character device node path. However, UBIFS may also be mounted withoug any | |
1862 | * character device node using one of the following methods: | |
1863 | * | |
1864 | * o ubiX_Y - mount UBI device number X, volume Y; | |
1865 | * o ubiY - mount UBI device number 0, volume Y; | |
1e51764a AB |
1866 | * o ubiX:NAME - mount UBI device X, volume with name NAME; |
1867 | * o ubi:NAME - mount UBI device 0, volume with name NAME. | |
1868 | * | |
1869 | * Alternative '!' separator may be used instead of ':' (because some shells | |
1870 | * like busybox may interpret ':' as an NFS host name separator). This function | |
9722324e CC |
1871 | * returns UBI volume description object in case of success and a negative |
1872 | * error code in case of failure. | |
1e51764a AB |
1873 | */ |
1874 | static struct ubi_volume_desc *open_ubi(const char *name, int mode) | |
1875 | { | |
9722324e | 1876 | struct ubi_volume_desc *ubi; |
1e51764a AB |
1877 | int dev, vol; |
1878 | char *endptr; | |
1879 | ||
9722324e CC |
1880 | /* First, try to open using the device node path method */ |
1881 | ubi = ubi_open_volume_path(name, mode); | |
1882 | if (!IS_ERR(ubi)) | |
1883 | return ubi; | |
1884 | ||
1885 | /* Try the "nodev" method */ | |
1e51764a AB |
1886 | if (name[0] != 'u' || name[1] != 'b' || name[2] != 'i') |
1887 | return ERR_PTR(-EINVAL); | |
1888 | ||
1889 | /* ubi:NAME method */ | |
1890 | if ((name[3] == ':' || name[3] == '!') && name[4] != '\0') | |
1891 | return ubi_open_volume_nm(0, name + 4, mode); | |
1892 | ||
1893 | if (!isdigit(name[3])) | |
1894 | return ERR_PTR(-EINVAL); | |
1895 | ||
1896 | dev = simple_strtoul(name + 3, &endptr, 0); | |
1897 | ||
1898 | /* ubiY method */ | |
1899 | if (*endptr == '\0') | |
1900 | return ubi_open_volume(0, dev, mode); | |
1901 | ||
1902 | /* ubiX_Y method */ | |
1903 | if (*endptr == '_' && isdigit(endptr[1])) { | |
1904 | vol = simple_strtoul(endptr + 1, &endptr, 0); | |
1905 | if (*endptr != '\0') | |
1906 | return ERR_PTR(-EINVAL); | |
1907 | return ubi_open_volume(dev, vol, mode); | |
1908 | } | |
1909 | ||
1910 | /* ubiX:NAME method */ | |
1911 | if ((*endptr == ':' || *endptr == '!') && endptr[1] != '\0') | |
1912 | return ubi_open_volume_nm(dev, ++endptr, mode); | |
1913 | ||
1914 | return ERR_PTR(-EINVAL); | |
1915 | } | |
1916 | ||
1917 | static int ubifs_fill_super(struct super_block *sb, void *data, int silent) | |
1918 | { | |
1919 | struct ubi_volume_desc *ubi = sb->s_fs_info; | |
1920 | struct ubifs_info *c; | |
1921 | struct inode *root; | |
1922 | int err; | |
1923 | ||
1924 | c = kzalloc(sizeof(struct ubifs_info), GFP_KERNEL); | |
1925 | if (!c) | |
1926 | return -ENOMEM; | |
1927 | ||
1928 | spin_lock_init(&c->cnt_lock); | |
1929 | spin_lock_init(&c->cs_lock); | |
1930 | spin_lock_init(&c->buds_lock); | |
1931 | spin_lock_init(&c->space_lock); | |
1932 | spin_lock_init(&c->orphan_lock); | |
1933 | init_rwsem(&c->commit_sem); | |
1934 | mutex_init(&c->lp_mutex); | |
1935 | mutex_init(&c->tnc_mutex); | |
1936 | mutex_init(&c->log_mutex); | |
1937 | mutex_init(&c->mst_mutex); | |
1938 | mutex_init(&c->umount_mutex); | |
3477d204 | 1939 | mutex_init(&c->bu_mutex); |
1e51764a AB |
1940 | init_waitqueue_head(&c->cmt_wq); |
1941 | c->buds = RB_ROOT; | |
1942 | c->old_idx = RB_ROOT; | |
1943 | c->size_tree = RB_ROOT; | |
1944 | c->orph_tree = RB_ROOT; | |
1945 | INIT_LIST_HEAD(&c->infos_list); | |
1946 | INIT_LIST_HEAD(&c->idx_gc); | |
1947 | INIT_LIST_HEAD(&c->replay_list); | |
1948 | INIT_LIST_HEAD(&c->replay_buds); | |
1949 | INIT_LIST_HEAD(&c->uncat_list); | |
1950 | INIT_LIST_HEAD(&c->empty_list); | |
1951 | INIT_LIST_HEAD(&c->freeable_list); | |
1952 | INIT_LIST_HEAD(&c->frdi_idx_list); | |
1953 | INIT_LIST_HEAD(&c->unclean_leb_list); | |
1954 | INIT_LIST_HEAD(&c->old_buds); | |
1955 | INIT_LIST_HEAD(&c->orph_list); | |
1956 | INIT_LIST_HEAD(&c->orph_new); | |
1957 | ||
8379ea31 | 1958 | c->vfs_sb = sb; |
1e51764a | 1959 | c->highest_inum = UBIFS_FIRST_INO; |
1e51764a AB |
1960 | c->lhead_lnum = c->ltail_lnum = UBIFS_LOG_LNUM; |
1961 | ||
1962 | ubi_get_volume_info(ubi, &c->vi); | |
1963 | ubi_get_device_info(c->vi.ubi_num, &c->di); | |
1964 | ||
1965 | /* Re-open the UBI device in read-write mode */ | |
1966 | c->ubi = ubi_open_volume(c->vi.ubi_num, c->vi.vol_id, UBI_READWRITE); | |
1967 | if (IS_ERR(c->ubi)) { | |
1968 | err = PTR_ERR(c->ubi); | |
1969 | goto out_free; | |
1970 | } | |
1971 | ||
1972 | /* | |
0a883a05 | 1973 | * UBIFS provides 'backing_dev_info' in order to disable read-ahead. For |
1e51764a AB |
1974 | * UBIFS, I/O is not deferred, it is done immediately in readpage, |
1975 | * which means the user would have to wait not just for their own I/O | |
0a883a05 | 1976 | * but the read-ahead I/O as well i.e. completely pointless. |
1e51764a AB |
1977 | * |
1978 | * Read-ahead will be disabled because @c->bdi.ra_pages is 0. | |
1979 | */ | |
d993831f | 1980 | c->bdi.name = "ubifs", |
1e51764a AB |
1981 | c->bdi.capabilities = BDI_CAP_MAP_COPY; |
1982 | c->bdi.unplug_io_fn = default_unplug_io_fn; | |
1983 | err = bdi_init(&c->bdi); | |
1984 | if (err) | |
1985 | goto out_close; | |
7fcd9c3e DM |
1986 | err = bdi_register(&c->bdi, NULL, "ubifs_%d_%d", |
1987 | c->vi.ubi_num, c->vi.vol_id); | |
a979eff1 JA |
1988 | if (err) |
1989 | goto out_bdi; | |
1e51764a AB |
1990 | |
1991 | err = ubifs_parse_options(c, data, 0); | |
1992 | if (err) | |
1993 | goto out_bdi; | |
1994 | ||
32a88aa1 | 1995 | sb->s_bdi = &c->bdi; |
1e51764a AB |
1996 | sb->s_fs_info = c; |
1997 | sb->s_magic = UBIFS_SUPER_MAGIC; | |
1998 | sb->s_blocksize = UBIFS_BLOCK_SIZE; | |
1999 | sb->s_blocksize_bits = UBIFS_BLOCK_SHIFT; | |
1e51764a AB |
2000 | sb->s_maxbytes = c->max_inode_sz = key_max_inode_size(c); |
2001 | if (c->max_inode_sz > MAX_LFS_FILESIZE) | |
2002 | sb->s_maxbytes = c->max_inode_sz = MAX_LFS_FILESIZE; | |
2003 | sb->s_op = &ubifs_super_operations; | |
2004 | ||
2005 | mutex_lock(&c->umount_mutex); | |
2006 | err = mount_ubifs(c); | |
2007 | if (err) { | |
2008 | ubifs_assert(err < 0); | |
2009 | goto out_unlock; | |
2010 | } | |
2011 | ||
2012 | /* Read the root inode */ | |
2013 | root = ubifs_iget(sb, UBIFS_ROOT_INO); | |
2014 | if (IS_ERR(root)) { | |
2015 | err = PTR_ERR(root); | |
2016 | goto out_umount; | |
2017 | } | |
2018 | ||
2019 | sb->s_root = d_alloc_root(root); | |
2020 | if (!sb->s_root) | |
2021 | goto out_iput; | |
2022 | ||
2023 | mutex_unlock(&c->umount_mutex); | |
1e51764a AB |
2024 | return 0; |
2025 | ||
2026 | out_iput: | |
2027 | iput(root); | |
2028 | out_umount: | |
2029 | ubifs_umount(c); | |
2030 | out_unlock: | |
2031 | mutex_unlock(&c->umount_mutex); | |
2032 | out_bdi: | |
2033 | bdi_destroy(&c->bdi); | |
2034 | out_close: | |
2035 | ubi_close_volume(c->ubi); | |
2036 | out_free: | |
2037 | kfree(c); | |
2038 | return err; | |
2039 | } | |
2040 | ||
2041 | static int sb_test(struct super_block *sb, void *data) | |
2042 | { | |
2043 | dev_t *dev = data; | |
7c83f5cb | 2044 | struct ubifs_info *c = sb->s_fs_info; |
1e51764a | 2045 | |
7c83f5cb | 2046 | return c->vi.cdev == *dev; |
1e51764a AB |
2047 | } |
2048 | ||
157d81e7 AV |
2049 | static struct dentry *ubifs_mount(struct file_system_type *fs_type, int flags, |
2050 | const char *name, void *data) | |
1e51764a AB |
2051 | { |
2052 | struct ubi_volume_desc *ubi; | |
2053 | struct ubi_volume_info vi; | |
2054 | struct super_block *sb; | |
2055 | int err; | |
2056 | ||
2057 | dbg_gen("name %s, flags %#x", name, flags); | |
2058 | ||
2059 | /* | |
2060 | * Get UBI device number and volume ID. Mount it read-only so far | |
2061 | * because this might be a new mount point, and UBI allows only one | |
2062 | * read-write user at a time. | |
2063 | */ | |
2064 | ubi = open_ubi(name, UBI_READONLY); | |
2065 | if (IS_ERR(ubi)) { | |
54dd55a4 SS |
2066 | dbg_err("cannot open \"%s\", error %d", |
2067 | name, (int)PTR_ERR(ubi)); | |
157d81e7 | 2068 | return ERR_CAST(ubi); |
1e51764a AB |
2069 | } |
2070 | ubi_get_volume_info(ubi, &vi); | |
2071 | ||
2072 | dbg_gen("opened ubi%d_%d", vi.ubi_num, vi.vol_id); | |
2073 | ||
7c83f5cb | 2074 | sb = sget(fs_type, &sb_test, &set_anon_super, &vi.cdev); |
1e51764a AB |
2075 | if (IS_ERR(sb)) { |
2076 | err = PTR_ERR(sb); | |
2077 | goto out_close; | |
2078 | } | |
2079 | ||
2080 | if (sb->s_root) { | |
2ef13294 AB |
2081 | struct ubifs_info *c1 = sb->s_fs_info; |
2082 | ||
1e51764a AB |
2083 | /* A new mount point for already mounted UBIFS */ |
2084 | dbg_gen("this ubi volume is already mounted"); | |
2ef13294 | 2085 | if (!!(flags & MS_RDONLY) != c1->ro_mount) { |
1e51764a AB |
2086 | err = -EBUSY; |
2087 | goto out_deact; | |
2088 | } | |
2089 | } else { | |
2090 | sb->s_flags = flags; | |
2091 | /* | |
2092 | * Pass 'ubi' to 'fill_super()' in sb->s_fs_info where it is | |
2093 | * replaced by 'c'. | |
2094 | */ | |
2095 | sb->s_fs_info = ubi; | |
2096 | err = ubifs_fill_super(sb, data, flags & MS_SILENT ? 1 : 0); | |
2097 | if (err) | |
2098 | goto out_deact; | |
2099 | /* We do not support atime */ | |
2100 | sb->s_flags |= MS_ACTIVE | MS_NOATIME; | |
2101 | } | |
2102 | ||
2103 | /* 'fill_super()' opens ubi again so we must close it here */ | |
2104 | ubi_close_volume(ubi); | |
2105 | ||
157d81e7 | 2106 | return dget(sb->s_root); |
1e51764a AB |
2107 | |
2108 | out_deact: | |
6f5bbff9 | 2109 | deactivate_locked_super(sb); |
1e51764a AB |
2110 | out_close: |
2111 | ubi_close_volume(ubi); | |
157d81e7 | 2112 | return ERR_PTR(err); |
1e51764a AB |
2113 | } |
2114 | ||
1e51764a AB |
2115 | static struct file_system_type ubifs_fs_type = { |
2116 | .name = "ubifs", | |
2117 | .owner = THIS_MODULE, | |
157d81e7 | 2118 | .mount = ubifs_mount, |
7c83f5cb | 2119 | .kill_sb = kill_anon_super, |
1e51764a AB |
2120 | }; |
2121 | ||
2122 | /* | |
2123 | * Inode slab cache constructor. | |
2124 | */ | |
51cc5068 | 2125 | static void inode_slab_ctor(void *obj) |
1e51764a AB |
2126 | { |
2127 | struct ubifs_inode *ui = obj; | |
2128 | inode_init_once(&ui->vfs_inode); | |
2129 | } | |
2130 | ||
2131 | static int __init ubifs_init(void) | |
2132 | { | |
2133 | int err; | |
2134 | ||
2135 | BUILD_BUG_ON(sizeof(struct ubifs_ch) != 24); | |
2136 | ||
2137 | /* Make sure node sizes are 8-byte aligned */ | |
2138 | BUILD_BUG_ON(UBIFS_CH_SZ & 7); | |
2139 | BUILD_BUG_ON(UBIFS_INO_NODE_SZ & 7); | |
2140 | BUILD_BUG_ON(UBIFS_DENT_NODE_SZ & 7); | |
2141 | BUILD_BUG_ON(UBIFS_XENT_NODE_SZ & 7); | |
2142 | BUILD_BUG_ON(UBIFS_DATA_NODE_SZ & 7); | |
2143 | BUILD_BUG_ON(UBIFS_TRUN_NODE_SZ & 7); | |
2144 | BUILD_BUG_ON(UBIFS_SB_NODE_SZ & 7); | |
2145 | BUILD_BUG_ON(UBIFS_MST_NODE_SZ & 7); | |
2146 | BUILD_BUG_ON(UBIFS_REF_NODE_SZ & 7); | |
2147 | BUILD_BUG_ON(UBIFS_CS_NODE_SZ & 7); | |
2148 | BUILD_BUG_ON(UBIFS_ORPH_NODE_SZ & 7); | |
2149 | ||
2150 | BUILD_BUG_ON(UBIFS_MAX_DENT_NODE_SZ & 7); | |
2151 | BUILD_BUG_ON(UBIFS_MAX_XENT_NODE_SZ & 7); | |
2152 | BUILD_BUG_ON(UBIFS_MAX_DATA_NODE_SZ & 7); | |
2153 | BUILD_BUG_ON(UBIFS_MAX_INO_NODE_SZ & 7); | |
2154 | BUILD_BUG_ON(UBIFS_MAX_NODE_SZ & 7); | |
2155 | BUILD_BUG_ON(MIN_WRITE_SZ & 7); | |
2156 | ||
2157 | /* Check min. node size */ | |
2158 | BUILD_BUG_ON(UBIFS_INO_NODE_SZ < MIN_WRITE_SZ); | |
2159 | BUILD_BUG_ON(UBIFS_DENT_NODE_SZ < MIN_WRITE_SZ); | |
2160 | BUILD_BUG_ON(UBIFS_XENT_NODE_SZ < MIN_WRITE_SZ); | |
2161 | BUILD_BUG_ON(UBIFS_TRUN_NODE_SZ < MIN_WRITE_SZ); | |
2162 | ||
2163 | BUILD_BUG_ON(UBIFS_MAX_DENT_NODE_SZ > UBIFS_MAX_NODE_SZ); | |
2164 | BUILD_BUG_ON(UBIFS_MAX_XENT_NODE_SZ > UBIFS_MAX_NODE_SZ); | |
2165 | BUILD_BUG_ON(UBIFS_MAX_DATA_NODE_SZ > UBIFS_MAX_NODE_SZ); | |
2166 | BUILD_BUG_ON(UBIFS_MAX_INO_NODE_SZ > UBIFS_MAX_NODE_SZ); | |
2167 | ||
2168 | /* Defined node sizes */ | |
2169 | BUILD_BUG_ON(UBIFS_SB_NODE_SZ != 4096); | |
2170 | BUILD_BUG_ON(UBIFS_MST_NODE_SZ != 512); | |
2171 | BUILD_BUG_ON(UBIFS_INO_NODE_SZ != 160); | |
2172 | BUILD_BUG_ON(UBIFS_REF_NODE_SZ != 64); | |
2173 | ||
a1dc080c AB |
2174 | /* |
2175 | * We use 2 bit wide bit-fields to store compression type, which should | |
2176 | * be amended if more compressors are added. The bit-fields are: | |
553dea4d AB |
2177 | * @compr_type in 'struct ubifs_inode', @default_compr in |
2178 | * 'struct ubifs_info' and @compr_type in 'struct ubifs_mount_opts'. | |
a1dc080c AB |
2179 | */ |
2180 | BUILD_BUG_ON(UBIFS_COMPR_TYPES_CNT > 4); | |
2181 | ||
1e51764a AB |
2182 | /* |
2183 | * We require that PAGE_CACHE_SIZE is greater-than-or-equal-to | |
2184 | * UBIFS_BLOCK_SIZE. It is assumed that both are powers of 2. | |
2185 | */ | |
2186 | if (PAGE_CACHE_SIZE < UBIFS_BLOCK_SIZE) { | |
2187 | ubifs_err("VFS page cache size is %u bytes, but UBIFS requires" | |
2188 | " at least 4096 bytes", | |
2189 | (unsigned int)PAGE_CACHE_SIZE); | |
2190 | return -EINVAL; | |
2191 | } | |
2192 | ||
2193 | err = register_filesystem(&ubifs_fs_type); | |
2194 | if (err) { | |
2195 | ubifs_err("cannot register file system, error %d", err); | |
2196 | return err; | |
2197 | } | |
2198 | ||
2199 | err = -ENOMEM; | |
2200 | ubifs_inode_slab = kmem_cache_create("ubifs_inode_slab", | |
2201 | sizeof(struct ubifs_inode), 0, | |
2202 | SLAB_MEM_SPREAD | SLAB_RECLAIM_ACCOUNT, | |
2203 | &inode_slab_ctor); | |
2204 | if (!ubifs_inode_slab) | |
2205 | goto out_reg; | |
2206 | ||
2207 | register_shrinker(&ubifs_shrinker_info); | |
2208 | ||
2209 | err = ubifs_compressors_init(); | |
552ff317 AB |
2210 | if (err) |
2211 | goto out_shrinker; | |
2212 | ||
2213 | err = dbg_debugfs_init(); | |
1e51764a AB |
2214 | if (err) |
2215 | goto out_compr; | |
2216 | ||
2217 | return 0; | |
2218 | ||
2219 | out_compr: | |
552ff317 AB |
2220 | ubifs_compressors_exit(); |
2221 | out_shrinker: | |
1e51764a AB |
2222 | unregister_shrinker(&ubifs_shrinker_info); |
2223 | kmem_cache_destroy(ubifs_inode_slab); | |
2224 | out_reg: | |
2225 | unregister_filesystem(&ubifs_fs_type); | |
2226 | return err; | |
2227 | } | |
2228 | /* late_initcall to let compressors initialize first */ | |
2229 | late_initcall(ubifs_init); | |
2230 | ||
2231 | static void __exit ubifs_exit(void) | |
2232 | { | |
2233 | ubifs_assert(list_empty(&ubifs_infos)); | |
2234 | ubifs_assert(atomic_long_read(&ubifs_clean_zn_cnt) == 0); | |
2235 | ||
552ff317 | 2236 | dbg_debugfs_exit(); |
1e51764a AB |
2237 | ubifs_compressors_exit(); |
2238 | unregister_shrinker(&ubifs_shrinker_info); | |
2239 | kmem_cache_destroy(ubifs_inode_slab); | |
2240 | unregister_filesystem(&ubifs_fs_type); | |
2241 | } | |
2242 | module_exit(ubifs_exit); | |
2243 | ||
2244 | MODULE_LICENSE("GPL"); | |
2245 | MODULE_VERSION(__stringify(UBIFS_VERSION)); | |
2246 | MODULE_AUTHOR("Artem Bityutskiy, Adrian Hunter"); | |
2247 | MODULE_DESCRIPTION("UBIFS - UBI File System"); |