Commit | Line | Data |
---|---|---|
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 | 47 | /* Slab cache for UBIFS inodes */ |
e996bfd4 | 48 | static struct kmem_cache *ubifs_inode_slab; |
1e51764a AB |
49 | |
50 | /* UBIFS TNC shrinker description */ | |
51 | static struct shrinker ubifs_shrinker_info = { | |
1ab6c499 DC |
52 | .scan_objects = ubifs_shrink_scan, |
53 | .count_objects = ubifs_shrink_count, | |
1e51764a AB |
54 | .seeks = DEFAULT_SEEKS, |
55 | }; | |
56 | ||
57 | /** | |
58 | * validate_inode - validate inode. | |
59 | * @c: UBIFS file-system description object | |
60 | * @inode: the inode to validate | |
61 | * | |
62 | * This is a helper function for 'ubifs_iget()' which validates various fields | |
63 | * of a newly built inode to make sure they contain sane values and prevent | |
64 | * possible vulnerabilities. Returns zero if the inode is all right and | |
65 | * a non-zero error code if not. | |
66 | */ | |
67 | static int validate_inode(struct ubifs_info *c, const struct inode *inode) | |
68 | { | |
69 | int err; | |
70 | const struct ubifs_inode *ui = ubifs_inode(inode); | |
71 | ||
72 | if (inode->i_size > c->max_inode_sz) { | |
235c362b | 73 | ubifs_err(c, "inode is too large (%lld)", |
1e51764a AB |
74 | (long long)inode->i_size); |
75 | return 1; | |
76 | } | |
77 | ||
b793a8c8 | 78 | if (ui->compr_type >= UBIFS_COMPR_TYPES_CNT) { |
235c362b | 79 | ubifs_err(c, "unknown compression type %d", ui->compr_type); |
1e51764a AB |
80 | return 2; |
81 | } | |
82 | ||
83 | if (ui->xattr_names + ui->xattr_cnt > XATTR_LIST_MAX) | |
84 | return 3; | |
85 | ||
86 | if (ui->data_len < 0 || ui->data_len > UBIFS_MAX_INO_DATA) | |
87 | return 4; | |
88 | ||
a29fa9df | 89 | if (ui->xattr && !S_ISREG(inode->i_mode)) |
1e51764a AB |
90 | return 5; |
91 | ||
6eb61d58 | 92 | if (!ubifs_compr_present(c, ui->compr_type)) { |
235c362b | 93 | ubifs_warn(c, "inode %lu uses '%s' compression, but it was not compiled in", |
6eb61d58 | 94 | inode->i_ino, ubifs_compr_name(c, ui->compr_type)); |
1e51764a AB |
95 | } |
96 | ||
1b51e983 | 97 | err = dbg_check_dir(c, inode); |
1e51764a AB |
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 | ||
8c1c5f26 | 131 | inode->i_flags |= S_NOCMTIME; |
e3d73dea SH |
132 | |
133 | if (!IS_ENABLED(CONFIG_UBIFS_ATIME_SUPPORT)) | |
134 | inode->i_flags |= S_NOATIME; | |
135 | ||
bfe86848 | 136 | set_nlink(inode, le32_to_cpu(ino->nlink)); |
39241beb EB |
137 | i_uid_write(inode, le32_to_cpu(ino->uid)); |
138 | i_gid_write(inode, le32_to_cpu(ino->gid)); | |
1e51764a AB |
139 | inode->i_atime.tv_sec = (int64_t)le64_to_cpu(ino->atime_sec); |
140 | inode->i_atime.tv_nsec = le32_to_cpu(ino->atime_nsec); | |
141 | inode->i_mtime.tv_sec = (int64_t)le64_to_cpu(ino->mtime_sec); | |
142 | inode->i_mtime.tv_nsec = le32_to_cpu(ino->mtime_nsec); | |
143 | inode->i_ctime.tv_sec = (int64_t)le64_to_cpu(ino->ctime_sec); | |
144 | inode->i_ctime.tv_nsec = le32_to_cpu(ino->ctime_nsec); | |
145 | inode->i_mode = le32_to_cpu(ino->mode); | |
146 | inode->i_size = le64_to_cpu(ino->size); | |
147 | ||
148 | ui->data_len = le32_to_cpu(ino->data_len); | |
149 | ui->flags = le32_to_cpu(ino->flags); | |
150 | ui->compr_type = le16_to_cpu(ino->compr_type); | |
151 | ui->creat_sqnum = le64_to_cpu(ino->creat_sqnum); | |
152 | ui->xattr_cnt = le32_to_cpu(ino->xattr_cnt); | |
153 | ui->xattr_size = le32_to_cpu(ino->xattr_size); | |
154 | ui->xattr_names = le32_to_cpu(ino->xattr_names); | |
155 | ui->synced_i_size = ui->ui_size = inode->i_size; | |
156 | ||
157 | ui->xattr = (ui->flags & UBIFS_XATTR_FL) ? 1 : 0; | |
158 | ||
159 | err = validate_inode(c, inode); | |
160 | if (err) | |
161 | goto out_invalid; | |
162 | ||
1e51764a AB |
163 | switch (inode->i_mode & S_IFMT) { |
164 | case S_IFREG: | |
165 | inode->i_mapping->a_ops = &ubifs_file_address_operations; | |
166 | inode->i_op = &ubifs_file_inode_operations; | |
167 | inode->i_fop = &ubifs_file_operations; | |
168 | if (ui->xattr) { | |
169 | ui->data = kmalloc(ui->data_len + 1, GFP_NOFS); | |
170 | if (!ui->data) { | |
171 | err = -ENOMEM; | |
172 | goto out_ino; | |
173 | } | |
174 | memcpy(ui->data, ino->data, ui->data_len); | |
175 | ((char *)ui->data)[ui->data_len] = '\0'; | |
176 | } else if (ui->data_len != 0) { | |
177 | err = 10; | |
178 | goto out_invalid; | |
179 | } | |
180 | break; | |
181 | case S_IFDIR: | |
182 | inode->i_op = &ubifs_dir_inode_operations; | |
183 | inode->i_fop = &ubifs_dir_operations; | |
184 | if (ui->data_len != 0) { | |
185 | err = 11; | |
186 | goto out_invalid; | |
187 | } | |
188 | break; | |
189 | case S_IFLNK: | |
190 | inode->i_op = &ubifs_symlink_inode_operations; | |
191 | if (ui->data_len <= 0 || ui->data_len > UBIFS_MAX_INO_DATA) { | |
192 | err = 12; | |
193 | goto out_invalid; | |
194 | } | |
195 | ui->data = kmalloc(ui->data_len + 1, GFP_NOFS); | |
196 | if (!ui->data) { | |
197 | err = -ENOMEM; | |
198 | goto out_ino; | |
199 | } | |
200 | memcpy(ui->data, ino->data, ui->data_len); | |
201 | ((char *)ui->data)[ui->data_len] = '\0'; | |
202 | break; | |
203 | case S_IFBLK: | |
204 | case S_IFCHR: | |
205 | { | |
206 | dev_t rdev; | |
207 | union ubifs_dev_desc *dev; | |
208 | ||
209 | ui->data = kmalloc(sizeof(union ubifs_dev_desc), GFP_NOFS); | |
210 | if (!ui->data) { | |
211 | err = -ENOMEM; | |
212 | goto out_ino; | |
213 | } | |
214 | ||
215 | dev = (union ubifs_dev_desc *)ino->data; | |
216 | if (ui->data_len == sizeof(dev->new)) | |
217 | rdev = new_decode_dev(le32_to_cpu(dev->new)); | |
218 | else if (ui->data_len == sizeof(dev->huge)) | |
219 | rdev = huge_decode_dev(le64_to_cpu(dev->huge)); | |
220 | else { | |
221 | err = 13; | |
222 | goto out_invalid; | |
223 | } | |
224 | memcpy(ui->data, ino->data, ui->data_len); | |
225 | inode->i_op = &ubifs_file_inode_operations; | |
226 | init_special_inode(inode, inode->i_mode, rdev); | |
227 | break; | |
228 | } | |
229 | case S_IFSOCK: | |
230 | case S_IFIFO: | |
231 | inode->i_op = &ubifs_file_inode_operations; | |
232 | init_special_inode(inode, inode->i_mode, 0); | |
233 | if (ui->data_len != 0) { | |
234 | err = 14; | |
235 | goto out_invalid; | |
236 | } | |
237 | break; | |
238 | default: | |
239 | err = 15; | |
240 | goto out_invalid; | |
241 | } | |
242 | ||
243 | kfree(ino); | |
244 | ubifs_set_inode_flags(inode); | |
245 | unlock_new_inode(inode); | |
246 | return inode; | |
247 | ||
248 | out_invalid: | |
235c362b | 249 | ubifs_err(c, "inode %lu validation failed, error %d", inode->i_ino, err); |
edf6be24 AB |
250 | ubifs_dump_node(c, ino); |
251 | ubifs_dump_inode(c, inode); | |
1e51764a AB |
252 | err = -EINVAL; |
253 | out_ino: | |
254 | kfree(ino); | |
255 | out: | |
235c362b | 256 | ubifs_err(c, "failed to read inode %lu, error %d", inode->i_ino, err); |
1e51764a AB |
257 | iget_failed(inode); |
258 | return ERR_PTR(err); | |
259 | } | |
260 | ||
261 | static struct inode *ubifs_alloc_inode(struct super_block *sb) | |
262 | { | |
263 | struct ubifs_inode *ui; | |
264 | ||
265 | ui = kmem_cache_alloc(ubifs_inode_slab, GFP_NOFS); | |
266 | if (!ui) | |
267 | return NULL; | |
268 | ||
269 | memset((void *)ui + sizeof(struct inode), 0, | |
270 | sizeof(struct ubifs_inode) - sizeof(struct inode)); | |
271 | mutex_init(&ui->ui_mutex); | |
272 | spin_lock_init(&ui->ui_lock); | |
273 | return &ui->vfs_inode; | |
274 | }; | |
275 | ||
dc431759 | 276 | static void ubifs_free_inode(struct inode *inode) |
fa0d7e3d | 277 | { |
fa0d7e3d | 278 | struct ubifs_inode *ui = ubifs_inode(inode); |
2c58d548 | 279 | |
0cdc17eb | 280 | kfree(ui->data); |
2c58d548 EB |
281 | fscrypt_free_inode(inode); |
282 | ||
fa0d7e3d NP |
283 | kmem_cache_free(ubifs_inode_slab, ui); |
284 | } | |
285 | ||
1e51764a AB |
286 | /* |
287 | * Note, Linux write-back code calls this without 'i_mutex'. | |
288 | */ | |
a9185b41 | 289 | static int ubifs_write_inode(struct inode *inode, struct writeback_control *wbc) |
1e51764a | 290 | { |
fbfa6c88 | 291 | int err = 0; |
1e51764a AB |
292 | struct ubifs_info *c = inode->i_sb->s_fs_info; |
293 | struct ubifs_inode *ui = ubifs_inode(inode); | |
294 | ||
6eb61d58 | 295 | ubifs_assert(c, !ui->xattr); |
1e51764a AB |
296 | if (is_bad_inode(inode)) |
297 | return 0; | |
298 | ||
299 | mutex_lock(&ui->ui_mutex); | |
300 | /* | |
301 | * Due to races between write-back forced by budgeting | |
5c57f20b | 302 | * (see 'sync_some_inodes()') and background write-back, the inode may |
1e51764a AB |
303 | * have already been synchronized, do not do this again. This might |
304 | * also happen if it was synchronized in an VFS operation, e.g. | |
305 | * 'ubifs_link()'. | |
306 | */ | |
307 | if (!ui->dirty) { | |
308 | mutex_unlock(&ui->ui_mutex); | |
309 | return 0; | |
310 | } | |
311 | ||
fbfa6c88 AB |
312 | /* |
313 | * As an optimization, do not write orphan inodes to the media just | |
314 | * because this is not needed. | |
315 | */ | |
316 | dbg_gen("inode %lu, mode %#x, nlink %u", | |
317 | inode->i_ino, (int)inode->i_mode, inode->i_nlink); | |
318 | if (inode->i_nlink) { | |
1f28681a | 319 | err = ubifs_jnl_write_inode(c, inode); |
fbfa6c88 | 320 | if (err) |
235c362b | 321 | ubifs_err(c, "can't write inode %lu, error %d", |
fbfa6c88 | 322 | inode->i_ino, err); |
e3c3efc2 AB |
323 | else |
324 | err = dbg_check_inode_size(c, inode, ui->ui_size); | |
fbfa6c88 | 325 | } |
1e51764a AB |
326 | |
327 | ui->dirty = 0; | |
328 | mutex_unlock(&ui->ui_mutex); | |
329 | ubifs_release_dirty_inode_budget(c, ui); | |
330 | return err; | |
331 | } | |
332 | ||
d640e1b5 | 333 | static void ubifs_evict_inode(struct inode *inode) |
1e51764a AB |
334 | { |
335 | int err; | |
336 | struct ubifs_info *c = inode->i_sb->s_fs_info; | |
1e0f358e | 337 | struct ubifs_inode *ui = ubifs_inode(inode); |
1e51764a | 338 | |
1e0f358e | 339 | if (ui->xattr) |
1e51764a AB |
340 | /* |
341 | * Extended attribute inode deletions are fully handled in | |
342 | * 'ubifs_removexattr()'. These inodes are special and have | |
343 | * limited usage, so there is nothing to do here. | |
344 | */ | |
345 | goto out; | |
346 | ||
7d32c2bb | 347 | dbg_gen("inode %lu, mode %#x", inode->i_ino, (int)inode->i_mode); |
6eb61d58 | 348 | ubifs_assert(c, !atomic_read(&inode->i_count)); |
1e51764a | 349 | |
91b0abe3 | 350 | truncate_inode_pages_final(&inode->i_data); |
d640e1b5 AV |
351 | |
352 | if (inode->i_nlink) | |
353 | goto done; | |
354 | ||
1e51764a AB |
355 | if (is_bad_inode(inode)) |
356 | goto out; | |
357 | ||
1e0f358e | 358 | ui->ui_size = inode->i_size = 0; |
de94eb55 | 359 | err = ubifs_jnl_delete_inode(c, inode); |
1e51764a AB |
360 | if (err) |
361 | /* | |
362 | * Worst case we have a lost orphan inode wasting space, so a | |
0a883a05 | 363 | * simple error message is OK here. |
1e51764a | 364 | */ |
235c362b | 365 | ubifs_err(c, "can't delete inode %lu, error %d", |
de94eb55 AB |
366 | inode->i_ino, err); |
367 | ||
1e51764a | 368 | out: |
1e0f358e AB |
369 | if (ui->dirty) |
370 | ubifs_release_dirty_inode_budget(c, ui); | |
6d6cb0d6 AH |
371 | else { |
372 | /* We've deleted something - clean the "no space" flags */ | |
b137545c | 373 | c->bi.nospace = c->bi.nospace_rp = 0; |
6d6cb0d6 AH |
374 | smp_wmb(); |
375 | } | |
d640e1b5 | 376 | done: |
dbd5768f | 377 | clear_inode(inode); |
3d204e24 | 378 | fscrypt_put_encryption_info(inode); |
1e51764a AB |
379 | } |
380 | ||
aa385729 | 381 | static void ubifs_dirty_inode(struct inode *inode, int flags) |
1e51764a | 382 | { |
6eb61d58 | 383 | struct ubifs_info *c = inode->i_sb->s_fs_info; |
1e51764a AB |
384 | struct ubifs_inode *ui = ubifs_inode(inode); |
385 | ||
6eb61d58 | 386 | ubifs_assert(c, mutex_is_locked(&ui->ui_mutex)); |
1e51764a AB |
387 | if (!ui->dirty) { |
388 | ui->dirty = 1; | |
389 | dbg_gen("inode %lu", inode->i_ino); | |
390 | } | |
391 | } | |
392 | ||
393 | static int ubifs_statfs(struct dentry *dentry, struct kstatfs *buf) | |
394 | { | |
395 | struct ubifs_info *c = dentry->d_sb->s_fs_info; | |
396 | unsigned long long free; | |
7c7cbadf | 397 | __le32 *uuid = (__le32 *)c->uuid; |
1e51764a | 398 | |
7dad181b | 399 | free = ubifs_get_free_space(c); |
1e51764a AB |
400 | dbg_gen("free space %lld bytes (%lld blocks)", |
401 | free, free >> UBIFS_BLOCK_SHIFT); | |
402 | ||
403 | buf->f_type = UBIFS_SUPER_MAGIC; | |
404 | buf->f_bsize = UBIFS_BLOCK_SIZE; | |
405 | buf->f_blocks = c->block_cnt; | |
406 | buf->f_bfree = free >> UBIFS_BLOCK_SHIFT; | |
407 | if (free > c->report_rp_size) | |
408 | buf->f_bavail = (free - c->report_rp_size) >> UBIFS_BLOCK_SHIFT; | |
409 | else | |
410 | buf->f_bavail = 0; | |
411 | buf->f_files = 0; | |
412 | buf->f_ffree = 0; | |
413 | buf->f_namelen = UBIFS_MAX_NLEN; | |
7c7cbadf AB |
414 | buf->f_fsid.val[0] = le32_to_cpu(uuid[0]) ^ le32_to_cpu(uuid[2]); |
415 | buf->f_fsid.val[1] = le32_to_cpu(uuid[1]) ^ le32_to_cpu(uuid[3]); | |
6eb61d58 | 416 | ubifs_assert(c, buf->f_bfree <= c->block_cnt); |
1e51764a AB |
417 | return 0; |
418 | } | |
419 | ||
34c80b1d | 420 | static int ubifs_show_options(struct seq_file *s, struct dentry *root) |
1e51764a | 421 | { |
34c80b1d | 422 | struct ubifs_info *c = root->d_sb->s_fs_info; |
1e51764a AB |
423 | |
424 | if (c->mount_opts.unmount_mode == 2) | |
d4eb08ff | 425 | seq_puts(s, ",fast_unmount"); |
1e51764a | 426 | else if (c->mount_opts.unmount_mode == 1) |
d4eb08ff | 427 | seq_puts(s, ",norm_unmount"); |
1e51764a | 428 | |
4793e7c5 | 429 | if (c->mount_opts.bulk_read == 2) |
d4eb08ff | 430 | seq_puts(s, ",bulk_read"); |
4793e7c5 | 431 | else if (c->mount_opts.bulk_read == 1) |
d4eb08ff | 432 | seq_puts(s, ",no_bulk_read"); |
4793e7c5 | 433 | |
2953e73f | 434 | if (c->mount_opts.chk_data_crc == 2) |
d4eb08ff | 435 | seq_puts(s, ",chk_data_crc"); |
2953e73f | 436 | else if (c->mount_opts.chk_data_crc == 1) |
d4eb08ff | 437 | seq_puts(s, ",no_chk_data_crc"); |
2953e73f | 438 | |
553dea4d | 439 | if (c->mount_opts.override_compr) { |
fcabb347 | 440 | seq_printf(s, ",compr=%s", |
6eb61d58 | 441 | ubifs_compr_name(c, c->mount_opts.compr_type)); |
553dea4d AB |
442 | } |
443 | ||
c38c5a7f | 444 | seq_printf(s, ",assert=%s", ubifs_assert_action_name(c)); |
319c1042 RV |
445 | seq_printf(s, ",ubi=%d,vol=%d", c->vi.ubi_num, c->vi.vol_id); |
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) { | |
235c362b | 499 | ubifs_warn(c, "UBI volume is corrupted - read-only mode"); |
1e51764a AB |
500 | c->ro_media = 1; |
501 | } | |
502 | ||
503 | if (c->di.ro_mode) { | |
235c362b | 504 | ubifs_msg(c, "read-only UBI device"); |
1e51764a AB |
505 | c->ro_media = 1; |
506 | } | |
507 | ||
508 | if (c->vi.vol_type == UBI_STATIC_VOLUME) { | |
235c362b | 509 | ubifs_msg(c, "static UBI volume - read-only mode"); |
1e51764a AB |
510 | c->ro_media = 1; |
511 | } | |
512 | ||
513 | c->leb_cnt = c->vi.size; | |
514 | c->leb_size = c->vi.usable_leb_size; | |
ca2ec61d | 515 | c->leb_start = c->di.leb_start; |
1e51764a AB |
516 | c->half_leb_size = c->leb_size / 2; |
517 | c->min_io_size = c->di.min_io_size; | |
518 | c->min_io_shift = fls(c->min_io_size) - 1; | |
3e8e2e0c AB |
519 | c->max_write_size = c->di.max_write_size; |
520 | c->max_write_shift = fls(c->max_write_size) - 1; | |
1e51764a AB |
521 | |
522 | if (c->leb_size < UBIFS_MIN_LEB_SZ) { | |
dccbc919 DG |
523 | ubifs_errc(c, "too small LEBs (%d bytes), min. is %d bytes", |
524 | c->leb_size, UBIFS_MIN_LEB_SZ); | |
1e51764a AB |
525 | return -EINVAL; |
526 | } | |
527 | ||
528 | if (c->leb_cnt < UBIFS_MIN_LEB_CNT) { | |
dccbc919 DG |
529 | ubifs_errc(c, "too few LEBs (%d), min. is %d", |
530 | c->leb_cnt, UBIFS_MIN_LEB_CNT); | |
1e51764a AB |
531 | return -EINVAL; |
532 | } | |
533 | ||
534 | if (!is_power_of_2(c->min_io_size)) { | |
dccbc919 | 535 | ubifs_errc(c, "bad min. I/O size %d", c->min_io_size); |
1e51764a AB |
536 | return -EINVAL; |
537 | } | |
538 | ||
3e8e2e0c AB |
539 | /* |
540 | * Maximum write size has to be greater or equivalent to min. I/O | |
541 | * size, and be multiple of min. I/O size. | |
542 | */ | |
543 | if (c->max_write_size < c->min_io_size || | |
544 | c->max_write_size % c->min_io_size || | |
545 | !is_power_of_2(c->max_write_size)) { | |
dccbc919 DG |
546 | ubifs_errc(c, "bad write buffer size %d for %d min. I/O unit", |
547 | c->max_write_size, c->min_io_size); | |
3e8e2e0c AB |
548 | return -EINVAL; |
549 | } | |
550 | ||
1e51764a AB |
551 | /* |
552 | * UBIFS aligns all node to 8-byte boundary, so to make function in | |
553 | * io.c simpler, assume minimum I/O unit size to be 8 bytes if it is | |
554 | * less than 8. | |
555 | */ | |
556 | if (c->min_io_size < 8) { | |
557 | c->min_io_size = 8; | |
558 | c->min_io_shift = 3; | |
3e8e2e0c AB |
559 | if (c->max_write_size < c->min_io_size) { |
560 | c->max_write_size = c->min_io_size; | |
561 | c->max_write_shift = c->min_io_shift; | |
562 | } | |
1e51764a AB |
563 | } |
564 | ||
565 | c->ref_node_alsz = ALIGN(UBIFS_REF_NODE_SZ, c->min_io_size); | |
566 | c->mst_node_alsz = ALIGN(UBIFS_MST_NODE_SZ, c->min_io_size); | |
567 | ||
568 | /* | |
569 | * Initialize node length ranges which are mostly needed for node | |
570 | * length validation. | |
571 | */ | |
572 | c->ranges[UBIFS_PAD_NODE].len = UBIFS_PAD_NODE_SZ; | |
573 | c->ranges[UBIFS_SB_NODE].len = UBIFS_SB_NODE_SZ; | |
574 | c->ranges[UBIFS_MST_NODE].len = UBIFS_MST_NODE_SZ; | |
575 | c->ranges[UBIFS_REF_NODE].len = UBIFS_REF_NODE_SZ; | |
576 | c->ranges[UBIFS_TRUN_NODE].len = UBIFS_TRUN_NODE_SZ; | |
577 | c->ranges[UBIFS_CS_NODE].len = UBIFS_CS_NODE_SZ; | |
d8a22773 SH |
578 | c->ranges[UBIFS_AUTH_NODE].min_len = UBIFS_AUTH_NODE_SZ; |
579 | c->ranges[UBIFS_AUTH_NODE].max_len = UBIFS_AUTH_NODE_SZ + | |
580 | UBIFS_MAX_HMAC_LEN; | |
1e51764a AB |
581 | |
582 | c->ranges[UBIFS_INO_NODE].min_len = UBIFS_INO_NODE_SZ; | |
583 | c->ranges[UBIFS_INO_NODE].max_len = UBIFS_MAX_INO_NODE_SZ; | |
584 | c->ranges[UBIFS_ORPH_NODE].min_len = | |
585 | UBIFS_ORPH_NODE_SZ + sizeof(__le64); | |
586 | c->ranges[UBIFS_ORPH_NODE].max_len = c->leb_size; | |
587 | c->ranges[UBIFS_DENT_NODE].min_len = UBIFS_DENT_NODE_SZ; | |
588 | c->ranges[UBIFS_DENT_NODE].max_len = UBIFS_MAX_DENT_NODE_SZ; | |
589 | c->ranges[UBIFS_XENT_NODE].min_len = UBIFS_XENT_NODE_SZ; | |
590 | c->ranges[UBIFS_XENT_NODE].max_len = UBIFS_MAX_XENT_NODE_SZ; | |
591 | c->ranges[UBIFS_DATA_NODE].min_len = UBIFS_DATA_NODE_SZ; | |
592 | c->ranges[UBIFS_DATA_NODE].max_len = UBIFS_MAX_DATA_NODE_SZ; | |
593 | /* | |
594 | * Minimum indexing node size is amended later when superblock is | |
595 | * read and the key length is known. | |
596 | */ | |
597 | c->ranges[UBIFS_IDX_NODE].min_len = UBIFS_IDX_NODE_SZ + UBIFS_BRANCH_SZ; | |
598 | /* | |
599 | * Maximum indexing node size is amended later when superblock is | |
600 | * read and the fanout is known. | |
601 | */ | |
602 | c->ranges[UBIFS_IDX_NODE].max_len = INT_MAX; | |
603 | ||
604 | /* | |
7078202e AB |
605 | * Initialize dead and dark LEB space watermarks. See gc.c for comments |
606 | * about these values. | |
1e51764a AB |
607 | */ |
608 | c->dead_wm = ALIGN(MIN_WRITE_SZ, c->min_io_size); | |
609 | c->dark_wm = ALIGN(UBIFS_MAX_NODE_SZ, c->min_io_size); | |
610 | ||
9bbb5726 AB |
611 | /* |
612 | * Calculate how many bytes would be wasted at the end of LEB if it was | |
613 | * fully filled with data nodes of maximum size. This is used in | |
614 | * calculations when reporting free space. | |
615 | */ | |
616 | c->leb_overhead = c->leb_size % UBIFS_MAX_DATA_NODE_SZ; | |
39ce81ce | 617 | |
4793e7c5 | 618 | /* Buffer size for bulk-reads */ |
6c0c42cd AB |
619 | c->max_bu_buf_len = UBIFS_MAX_BULK_READ * UBIFS_MAX_DATA_NODE_SZ; |
620 | if (c->max_bu_buf_len > c->leb_size) | |
621 | c->max_bu_buf_len = c->leb_size; | |
1e51764a AB |
622 | return 0; |
623 | } | |
624 | ||
625 | /** | |
626 | * bud_wbuf_callback - bud LEB write-buffer synchronization call-back. | |
627 | * @c: UBIFS file-system description object | |
628 | * @lnum: LEB the write-buffer was synchronized to | |
629 | * @free: how many free bytes left in this LEB | |
630 | * @pad: how many bytes were padded | |
631 | * | |
632 | * This is a callback function which is called by the I/O unit when the | |
633 | * write-buffer is synchronized. We need this to correctly maintain space | |
634 | * accounting in bud logical eraseblocks. This function returns zero in case of | |
635 | * success and a negative error code in case of failure. | |
636 | * | |
637 | * This function actually belongs to the journal, but we keep it here because | |
638 | * we want to keep it static. | |
639 | */ | |
640 | static int bud_wbuf_callback(struct ubifs_info *c, int lnum, int free, int pad) | |
641 | { | |
642 | return ubifs_update_one_lp(c, lnum, free, pad, 0, 0); | |
643 | } | |
644 | ||
645 | /* | |
79807d07 | 646 | * init_constants_sb - initialize UBIFS constants. |
1e51764a AB |
647 | * @c: UBIFS file-system description object |
648 | * | |
649 | * This is a helper function which initializes various UBIFS constants after | |
650 | * the superblock has been read. It also checks various UBIFS parameters and | |
651 | * makes sure they are all right. Returns zero in case of success and a | |
652 | * negative error code in case of failure. | |
653 | */ | |
79807d07 | 654 | static int init_constants_sb(struct ubifs_info *c) |
1e51764a AB |
655 | { |
656 | int tmp, err; | |
4d61db4f | 657 | long long tmp64; |
1e51764a AB |
658 | |
659 | c->main_bytes = (long long)c->main_lebs * c->leb_size; | |
660 | c->max_znode_sz = sizeof(struct ubifs_znode) + | |
661 | c->fanout * sizeof(struct ubifs_zbranch); | |
662 | ||
663 | tmp = ubifs_idx_node_sz(c, 1); | |
664 | c->ranges[UBIFS_IDX_NODE].min_len = tmp; | |
665 | c->min_idx_node_sz = ALIGN(tmp, 8); | |
666 | ||
667 | tmp = ubifs_idx_node_sz(c, c->fanout); | |
668 | c->ranges[UBIFS_IDX_NODE].max_len = tmp; | |
669 | c->max_idx_node_sz = ALIGN(tmp, 8); | |
670 | ||
671 | /* Make sure LEB size is large enough to fit full commit */ | |
672 | tmp = UBIFS_CS_NODE_SZ + UBIFS_REF_NODE_SZ * c->jhead_cnt; | |
673 | tmp = ALIGN(tmp, c->min_io_size); | |
674 | if (tmp > c->leb_size) { | |
235c362b | 675 | ubifs_err(c, "too small LEB size %d, at least %d needed", |
a6aae4dd | 676 | c->leb_size, tmp); |
1e51764a AB |
677 | return -EINVAL; |
678 | } | |
679 | ||
680 | /* | |
681 | * Make sure that the log is large enough to fit reference nodes for | |
682 | * all buds plus one reserved LEB. | |
683 | */ | |
4d61db4f AB |
684 | tmp64 = c->max_bud_bytes + c->leb_size - 1; |
685 | c->max_bud_cnt = div_u64(tmp64, c->leb_size); | |
1e51764a AB |
686 | tmp = (c->ref_node_alsz * c->max_bud_cnt + c->leb_size - 1); |
687 | tmp /= c->leb_size; | |
688 | tmp += 1; | |
689 | if (c->log_lebs < tmp) { | |
235c362b | 690 | ubifs_err(c, "too small log %d LEBs, required min. %d LEBs", |
a6aae4dd | 691 | c->log_lebs, tmp); |
1e51764a AB |
692 | return -EINVAL; |
693 | } | |
694 | ||
695 | /* | |
696 | * When budgeting we assume worst-case scenarios when the pages are not | |
697 | * be compressed and direntries are of the maximum size. | |
698 | * | |
699 | * Note, data, which may be stored in inodes is budgeted separately, so | |
b137545c | 700 | * it is not included into 'c->bi.inode_budget'. |
1e51764a | 701 | */ |
b137545c AB |
702 | c->bi.page_budget = UBIFS_MAX_DATA_NODE_SZ * UBIFS_BLOCKS_PER_PAGE; |
703 | c->bi.inode_budget = UBIFS_INO_NODE_SZ; | |
704 | c->bi.dent_budget = UBIFS_MAX_DENT_NODE_SZ; | |
1e51764a AB |
705 | |
706 | /* | |
707 | * When the amount of flash space used by buds becomes | |
708 | * 'c->max_bud_bytes', UBIFS just blocks all writers and starts commit. | |
709 | * The writers are unblocked when the commit is finished. To avoid | |
710 | * writers to be blocked UBIFS initiates background commit in advance, | |
711 | * when number of bud bytes becomes above the limit defined below. | |
712 | */ | |
713 | c->bg_bud_bytes = (c->max_bud_bytes * 13) >> 4; | |
714 | ||
715 | /* | |
716 | * Ensure minimum journal size. All the bytes in the journal heads are | |
717 | * considered to be used, when calculating the current journal usage. | |
718 | * Consequently, if the journal is too small, UBIFS will treat it as | |
719 | * always full. | |
720 | */ | |
4d61db4f | 721 | tmp64 = (long long)(c->jhead_cnt + 1) * c->leb_size + 1; |
1e51764a AB |
722 | if (c->bg_bud_bytes < tmp64) |
723 | c->bg_bud_bytes = tmp64; | |
724 | if (c->max_bud_bytes < tmp64 + c->leb_size) | |
725 | c->max_bud_bytes = tmp64 + c->leb_size; | |
726 | ||
727 | err = ubifs_calc_lpt_geom(c); | |
728 | if (err) | |
729 | return err; | |
730 | ||
fb1cd01a AB |
731 | /* Initialize effective LEB size used in budgeting calculations */ |
732 | c->idx_leb_size = c->leb_size - c->max_idx_node_sz; | |
79807d07 AB |
733 | return 0; |
734 | } | |
735 | ||
736 | /* | |
737 | * init_constants_master - initialize UBIFS constants. | |
738 | * @c: UBIFS file-system description object | |
739 | * | |
740 | * This is a helper function which initializes various UBIFS constants after | |
741 | * the master node has been read. It also checks various UBIFS parameters and | |
742 | * makes sure they are all right. | |
743 | */ | |
744 | static void init_constants_master(struct ubifs_info *c) | |
745 | { | |
746 | long long tmp64; | |
747 | ||
b137545c | 748 | c->bi.min_idx_lebs = ubifs_calc_min_idx_lebs(c); |
fb1cd01a | 749 | c->report_rp_size = ubifs_reported_space(c, c->rp_size); |
1e51764a AB |
750 | |
751 | /* | |
752 | * Calculate total amount of FS blocks. This number is not used | |
753 | * internally because it does not make much sense for UBIFS, but it is | |
754 | * necessary to report something for the 'statfs()' call. | |
755 | * | |
7dad181b | 756 | * Subtract the LEB reserved for GC, the LEB which is reserved for |
af14a1ad AB |
757 | * deletions, minimum LEBs for the index, and assume only one journal |
758 | * head is available. | |
1e51764a | 759 | */ |
af14a1ad | 760 | tmp64 = c->main_lebs - 1 - 1 - MIN_INDEX_LEBS - c->jhead_cnt + 1; |
4d61db4f | 761 | tmp64 *= (long long)c->leb_size - c->leb_overhead; |
1e51764a AB |
762 | tmp64 = ubifs_reported_space(c, tmp64); |
763 | c->block_cnt = tmp64 >> UBIFS_BLOCK_SHIFT; | |
1e51764a AB |
764 | } |
765 | ||
766 | /** | |
767 | * take_gc_lnum - reserve GC LEB. | |
768 | * @c: UBIFS file-system description object | |
769 | * | |
b4978e94 AB |
770 | * This function ensures that the LEB reserved for garbage collection is marked |
771 | * as "taken" in lprops. We also have to set free space to LEB size and dirty | |
772 | * space to zero, because lprops may contain out-of-date information if the | |
773 | * file-system was un-mounted before it has been committed. This function | |
774 | * returns zero in case of success and a negative error code in case of | |
775 | * failure. | |
1e51764a AB |
776 | */ |
777 | static int take_gc_lnum(struct ubifs_info *c) | |
778 | { | |
779 | int err; | |
780 | ||
781 | if (c->gc_lnum == -1) { | |
235c362b | 782 | ubifs_err(c, "no LEB for GC"); |
1e51764a AB |
783 | return -EINVAL; |
784 | } | |
785 | ||
1e51764a AB |
786 | /* And we have to tell lprops that this LEB is taken */ |
787 | err = ubifs_change_one_lp(c, c->gc_lnum, c->leb_size, 0, | |
788 | LPROPS_TAKEN, 0, 0); | |
789 | return err; | |
790 | } | |
791 | ||
792 | /** | |
793 | * alloc_wbufs - allocate write-buffers. | |
794 | * @c: UBIFS file-system description object | |
795 | * | |
796 | * This helper function allocates and initializes UBIFS write-buffers. Returns | |
797 | * zero in case of success and %-ENOMEM in case of failure. | |
798 | */ | |
799 | static int alloc_wbufs(struct ubifs_info *c) | |
800 | { | |
801 | int i, err; | |
802 | ||
86b4c14d FF |
803 | c->jheads = kcalloc(c->jhead_cnt, sizeof(struct ubifs_jhead), |
804 | GFP_KERNEL); | |
1e51764a AB |
805 | if (!c->jheads) |
806 | return -ENOMEM; | |
807 | ||
808 | /* Initialize journal heads */ | |
809 | for (i = 0; i < c->jhead_cnt; i++) { | |
810 | INIT_LIST_HEAD(&c->jheads[i].buds_list); | |
811 | err = ubifs_wbuf_init(c, &c->jheads[i].wbuf); | |
812 | if (err) | |
813 | return err; | |
814 | ||
815 | c->jheads[i].wbuf.sync_callback = &bud_wbuf_callback; | |
816 | c->jheads[i].wbuf.jhead = i; | |
1a0b0699 | 817 | c->jheads[i].grouped = 1; |
6a98bc46 SH |
818 | c->jheads[i].log_hash = ubifs_hash_get_desc(c); |
819 | if (IS_ERR(c->jheads[i].log_hash)) | |
820 | goto out; | |
1e51764a AB |
821 | } |
822 | ||
1e51764a | 823 | /* |
44156267 AB |
824 | * Garbage Collector head does not need to be synchronized by timer. |
825 | * Also GC head nodes are not grouped. | |
1e51764a | 826 | */ |
0b335b9d | 827 | c->jheads[GCHD].wbuf.no_timer = 1; |
1a0b0699 | 828 | c->jheads[GCHD].grouped = 0; |
1e51764a AB |
829 | |
830 | return 0; | |
6a98bc46 SH |
831 | |
832 | out: | |
833 | while (i--) | |
834 | kfree(c->jheads[i].log_hash); | |
835 | ||
836 | return err; | |
1e51764a AB |
837 | } |
838 | ||
839 | /** | |
840 | * free_wbufs - free write-buffers. | |
841 | * @c: UBIFS file-system description object | |
842 | */ | |
843 | static void free_wbufs(struct ubifs_info *c) | |
844 | { | |
845 | int i; | |
846 | ||
847 | if (c->jheads) { | |
848 | for (i = 0; i < c->jhead_cnt; i++) { | |
849 | kfree(c->jheads[i].wbuf.buf); | |
850 | kfree(c->jheads[i].wbuf.inodes); | |
6a98bc46 | 851 | kfree(c->jheads[i].log_hash); |
1e51764a AB |
852 | } |
853 | kfree(c->jheads); | |
854 | c->jheads = NULL; | |
855 | } | |
856 | } | |
857 | ||
858 | /** | |
859 | * free_orphans - free orphans. | |
860 | * @c: UBIFS file-system description object | |
861 | */ | |
862 | static void free_orphans(struct ubifs_info *c) | |
863 | { | |
864 | struct ubifs_orphan *orph; | |
865 | ||
866 | while (c->orph_dnext) { | |
867 | orph = c->orph_dnext; | |
868 | c->orph_dnext = orph->dnext; | |
869 | list_del(&orph->list); | |
870 | kfree(orph); | |
871 | } | |
872 | ||
873 | while (!list_empty(&c->orph_list)) { | |
874 | orph = list_entry(c->orph_list.next, struct ubifs_orphan, list); | |
875 | list_del(&orph->list); | |
876 | kfree(orph); | |
235c362b | 877 | ubifs_err(c, "orphan list not empty at unmount"); |
1e51764a AB |
878 | } |
879 | ||
880 | vfree(c->orph_buf); | |
881 | c->orph_buf = NULL; | |
882 | } | |
883 | ||
884 | /** | |
885 | * free_buds - free per-bud objects. | |
886 | * @c: UBIFS file-system description object | |
887 | */ | |
888 | static void free_buds(struct ubifs_info *c) | |
889 | { | |
bb25e49f CS |
890 | struct ubifs_bud *bud, *n; |
891 | ||
892 | rbtree_postorder_for_each_entry_safe(bud, n, &c->buds, rb) | |
893 | kfree(bud); | |
1e51764a AB |
894 | } |
895 | ||
896 | /** | |
897 | * check_volume_empty - check if the UBI volume is empty. | |
898 | * @c: UBIFS file-system description object | |
899 | * | |
900 | * This function checks if the UBIFS volume is empty by looking if its LEBs are | |
901 | * mapped or not. The result of checking is stored in the @c->empty variable. | |
902 | * Returns zero in case of success and a negative error code in case of | |
903 | * failure. | |
904 | */ | |
905 | static int check_volume_empty(struct ubifs_info *c) | |
906 | { | |
907 | int lnum, err; | |
908 | ||
909 | c->empty = 1; | |
910 | for (lnum = 0; lnum < c->leb_cnt; lnum++) { | |
d3b2578f | 911 | err = ubifs_is_mapped(c, lnum); |
1e51764a AB |
912 | if (unlikely(err < 0)) |
913 | return err; | |
914 | if (err == 1) { | |
915 | c->empty = 0; | |
916 | break; | |
917 | } | |
918 | ||
919 | cond_resched(); | |
920 | } | |
921 | ||
922 | return 0; | |
923 | } | |
924 | ||
925 | /* | |
926 | * UBIFS mount options. | |
927 | * | |
928 | * Opt_fast_unmount: do not run a journal commit before un-mounting | |
929 | * Opt_norm_unmount: run a journal commit before un-mounting | |
4793e7c5 AH |
930 | * Opt_bulk_read: enable bulk-reads |
931 | * Opt_no_bulk_read: disable bulk-reads | |
2953e73f AH |
932 | * Opt_chk_data_crc: check CRCs when reading data nodes |
933 | * Opt_no_chk_data_crc: do not check CRCs when reading data nodes | |
553dea4d | 934 | * Opt_override_compr: override default compressor |
c38c5a7f | 935 | * Opt_assert: set ubifs_assert() action |
d8a22773 SH |
936 | * Opt_auth_key: The key name used for authentication |
937 | * Opt_auth_hash_name: The hash type used for authentication | |
1e51764a AB |
938 | * Opt_err: just end of array marker |
939 | */ | |
940 | enum { | |
941 | Opt_fast_unmount, | |
942 | Opt_norm_unmount, | |
4793e7c5 AH |
943 | Opt_bulk_read, |
944 | Opt_no_bulk_read, | |
2953e73f AH |
945 | Opt_chk_data_crc, |
946 | Opt_no_chk_data_crc, | |
553dea4d | 947 | Opt_override_compr, |
c38c5a7f | 948 | Opt_assert, |
d8a22773 SH |
949 | Opt_auth_key, |
950 | Opt_auth_hash_name, | |
319c1042 | 951 | Opt_ignore, |
1e51764a AB |
952 | Opt_err, |
953 | }; | |
954 | ||
a447c093 | 955 | static const match_table_t tokens = { |
1e51764a AB |
956 | {Opt_fast_unmount, "fast_unmount"}, |
957 | {Opt_norm_unmount, "norm_unmount"}, | |
4793e7c5 AH |
958 | {Opt_bulk_read, "bulk_read"}, |
959 | {Opt_no_bulk_read, "no_bulk_read"}, | |
2953e73f AH |
960 | {Opt_chk_data_crc, "chk_data_crc"}, |
961 | {Opt_no_chk_data_crc, "no_chk_data_crc"}, | |
553dea4d | 962 | {Opt_override_compr, "compr=%s"}, |
d8a22773 SH |
963 | {Opt_auth_key, "auth_key=%s"}, |
964 | {Opt_auth_hash_name, "auth_hash_name=%s"}, | |
319c1042 RV |
965 | {Opt_ignore, "ubi=%s"}, |
966 | {Opt_ignore, "vol=%s"}, | |
c38c5a7f | 967 | {Opt_assert, "assert=%s"}, |
1e51764a AB |
968 | {Opt_err, NULL}, |
969 | }; | |
970 | ||
8379ea31 AB |
971 | /** |
972 | * parse_standard_option - parse a standard mount option. | |
973 | * @option: the option to parse | |
974 | * | |
975 | * Normally, standard mount options like "sync" are passed to file-systems as | |
976 | * flags. However, when a "rootflags=" kernel boot parameter is used, they may | |
977 | * be present in the options string. This function tries to deal with this | |
978 | * situation and parse standard options. Returns 0 if the option was not | |
979 | * recognized, and the corresponding integer flag if it was. | |
980 | * | |
981 | * UBIFS is only interested in the "sync" option, so do not check for anything | |
982 | * else. | |
983 | */ | |
984 | static int parse_standard_option(const char *option) | |
985 | { | |
235c362b SY |
986 | |
987 | pr_notice("UBIFS: parse %s\n", option); | |
8379ea31 | 988 | if (!strcmp(option, "sync")) |
1751e8a6 | 989 | return SB_SYNCHRONOUS; |
8379ea31 AB |
990 | return 0; |
991 | } | |
992 | ||
1e51764a AB |
993 | /** |
994 | * ubifs_parse_options - parse mount parameters. | |
995 | * @c: UBIFS file-system description object | |
996 | * @options: parameters to parse | |
997 | * @is_remount: non-zero if this is FS re-mount | |
998 | * | |
999 | * This function parses UBIFS mount options and returns zero in case success | |
1000 | * and a negative error code in case of failure. | |
1001 | */ | |
1002 | static int ubifs_parse_options(struct ubifs_info *c, char *options, | |
1003 | int is_remount) | |
1004 | { | |
1005 | char *p; | |
1006 | substring_t args[MAX_OPT_ARGS]; | |
1007 | ||
1008 | if (!options) | |
1009 | return 0; | |
1010 | ||
1011 | while ((p = strsep(&options, ","))) { | |
1012 | int token; | |
1013 | ||
1014 | if (!*p) | |
1015 | continue; | |
1016 | ||
1017 | token = match_token(p, tokens, args); | |
1018 | switch (token) { | |
27ad2799 AB |
1019 | /* |
1020 | * %Opt_fast_unmount and %Opt_norm_unmount options are ignored. | |
cb54ef8b | 1021 | * We accept them in order to be backward-compatible. But this |
27ad2799 AB |
1022 | * should be removed at some point. |
1023 | */ | |
1e51764a AB |
1024 | case Opt_fast_unmount: |
1025 | c->mount_opts.unmount_mode = 2; | |
1e51764a AB |
1026 | break; |
1027 | case Opt_norm_unmount: | |
1028 | c->mount_opts.unmount_mode = 1; | |
1e51764a | 1029 | break; |
4793e7c5 AH |
1030 | case Opt_bulk_read: |
1031 | c->mount_opts.bulk_read = 2; | |
1032 | c->bulk_read = 1; | |
1033 | break; | |
1034 | case Opt_no_bulk_read: | |
1035 | c->mount_opts.bulk_read = 1; | |
1036 | c->bulk_read = 0; | |
1037 | break; | |
2953e73f AH |
1038 | case Opt_chk_data_crc: |
1039 | c->mount_opts.chk_data_crc = 2; | |
1040 | c->no_chk_data_crc = 0; | |
1041 | break; | |
1042 | case Opt_no_chk_data_crc: | |
1043 | c->mount_opts.chk_data_crc = 1; | |
1044 | c->no_chk_data_crc = 1; | |
1045 | break; | |
553dea4d AB |
1046 | case Opt_override_compr: |
1047 | { | |
1048 | char *name = match_strdup(&args[0]); | |
1049 | ||
1050 | if (!name) | |
1051 | return -ENOMEM; | |
1052 | if (!strcmp(name, "none")) | |
1053 | c->mount_opts.compr_type = UBIFS_COMPR_NONE; | |
1054 | else if (!strcmp(name, "lzo")) | |
1055 | c->mount_opts.compr_type = UBIFS_COMPR_LZO; | |
1056 | else if (!strcmp(name, "zlib")) | |
1057 | c->mount_opts.compr_type = UBIFS_COMPR_ZLIB; | |
1058 | else { | |
235c362b | 1059 | ubifs_err(c, "unknown compressor \"%s\"", name); //FIXME: is c ready? |
553dea4d AB |
1060 | kfree(name); |
1061 | return -EINVAL; | |
1062 | } | |
1063 | kfree(name); | |
1064 | c->mount_opts.override_compr = 1; | |
1065 | c->default_compr = c->mount_opts.compr_type; | |
1066 | break; | |
1067 | } | |
c38c5a7f RW |
1068 | case Opt_assert: |
1069 | { | |
1070 | char *act = match_strdup(&args[0]); | |
1071 | ||
1072 | if (!act) | |
1073 | return -ENOMEM; | |
1074 | if (!strcmp(act, "report")) | |
1075 | c->assert_action = ASSACT_REPORT; | |
1076 | else if (!strcmp(act, "read-only")) | |
1077 | c->assert_action = ASSACT_RO; | |
1078 | else if (!strcmp(act, "panic")) | |
1079 | c->assert_action = ASSACT_PANIC; | |
1080 | else { | |
1081 | ubifs_err(c, "unknown assert action \"%s\"", act); | |
1082 | kfree(act); | |
1083 | return -EINVAL; | |
1084 | } | |
1085 | kfree(act); | |
1086 | break; | |
1087 | } | |
d8a22773 SH |
1088 | case Opt_auth_key: |
1089 | c->auth_key_name = kstrdup(args[0].from, GFP_KERNEL); | |
1090 | if (!c->auth_key_name) | |
1091 | return -ENOMEM; | |
1092 | break; | |
1093 | case Opt_auth_hash_name: | |
1094 | c->auth_hash_name = kstrdup(args[0].from, GFP_KERNEL); | |
1095 | if (!c->auth_hash_name) | |
1096 | return -ENOMEM; | |
1097 | break; | |
319c1042 RV |
1098 | case Opt_ignore: |
1099 | break; | |
1e51764a | 1100 | default: |
8379ea31 AB |
1101 | { |
1102 | unsigned long flag; | |
1103 | struct super_block *sb = c->vfs_sb; | |
1104 | ||
1105 | flag = parse_standard_option(p); | |
1106 | if (!flag) { | |
235c362b | 1107 | ubifs_err(c, "unrecognized mount option \"%s\" or missing value", |
79fda517 | 1108 | p); |
8379ea31 AB |
1109 | return -EINVAL; |
1110 | } | |
1111 | sb->s_flags |= flag; | |
1112 | break; | |
1113 | } | |
1e51764a AB |
1114 | } |
1115 | } | |
1116 | ||
1117 | return 0; | |
1118 | } | |
1119 | ||
1120 | /** | |
1121 | * destroy_journal - destroy journal data structures. | |
1122 | * @c: UBIFS file-system description object | |
1123 | * | |
1124 | * This function destroys journal data structures including those that may have | |
1125 | * been created by recovery functions. | |
1126 | */ | |
1127 | static void destroy_journal(struct ubifs_info *c) | |
1128 | { | |
1129 | while (!list_empty(&c->unclean_leb_list)) { | |
1130 | struct ubifs_unclean_leb *ucleb; | |
1131 | ||
1132 | ucleb = list_entry(c->unclean_leb_list.next, | |
1133 | struct ubifs_unclean_leb, list); | |
1134 | list_del(&ucleb->list); | |
1135 | kfree(ucleb); | |
1136 | } | |
1137 | while (!list_empty(&c->old_buds)) { | |
1138 | struct ubifs_bud *bud; | |
1139 | ||
1140 | bud = list_entry(c->old_buds.next, struct ubifs_bud, list); | |
1141 | list_del(&bud->list); | |
1142 | kfree(bud); | |
1143 | } | |
1144 | ubifs_destroy_idx_gc(c); | |
1145 | ubifs_destroy_size_tree(c); | |
1146 | ubifs_tnc_close(c); | |
1147 | free_buds(c); | |
1148 | } | |
1149 | ||
3477d204 AB |
1150 | /** |
1151 | * bu_init - initialize bulk-read information. | |
1152 | * @c: UBIFS file-system description object | |
1153 | */ | |
1154 | static void bu_init(struct ubifs_info *c) | |
1155 | { | |
6eb61d58 | 1156 | ubifs_assert(c, c->bulk_read == 1); |
3477d204 AB |
1157 | |
1158 | if (c->bu.buf) | |
1159 | return; /* Already initialized */ | |
1160 | ||
1161 | again: | |
1162 | c->bu.buf = kmalloc(c->max_bu_buf_len, GFP_KERNEL | __GFP_NOWARN); | |
1163 | if (!c->bu.buf) { | |
1164 | if (c->max_bu_buf_len > UBIFS_KMALLOC_OK) { | |
1165 | c->max_bu_buf_len = UBIFS_KMALLOC_OK; | |
1166 | goto again; | |
1167 | } | |
1168 | ||
1169 | /* Just disable bulk-read */ | |
235c362b | 1170 | ubifs_warn(c, "cannot allocate %d bytes of memory for bulk-read, disabling it", |
79fda517 | 1171 | c->max_bu_buf_len); |
3477d204 AB |
1172 | c->mount_opts.bulk_read = 1; |
1173 | c->bulk_read = 0; | |
1174 | return; | |
1175 | } | |
1176 | } | |
1177 | ||
57a450e9 AB |
1178 | /** |
1179 | * check_free_space - check if there is enough free space to mount. | |
1180 | * @c: UBIFS file-system description object | |
1181 | * | |
1182 | * This function makes sure UBIFS has enough free space to be mounted in | |
1183 | * read/write mode. UBIFS must always have some free space to allow deletions. | |
1184 | */ | |
1185 | static int check_free_space(struct ubifs_info *c) | |
1186 | { | |
6eb61d58 | 1187 | ubifs_assert(c, c->dark_wm > 0); |
57a450e9 | 1188 | if (c->lst.total_free + c->lst.total_dirty < c->dark_wm) { |
235c362b | 1189 | ubifs_err(c, "insufficient free space to mount in R/W mode"); |
edf6be24 AB |
1190 | ubifs_dump_budg(c, &c->bi); |
1191 | ubifs_dump_lprops(c); | |
a2b9df3f | 1192 | return -ENOSPC; |
57a450e9 AB |
1193 | } |
1194 | return 0; | |
1195 | } | |
1196 | ||
1e51764a AB |
1197 | /** |
1198 | * mount_ubifs - mount UBIFS file-system. | |
1199 | * @c: UBIFS file-system description object | |
1200 | * | |
1201 | * This function mounts UBIFS file system. Returns zero in case of success and | |
1202 | * a negative error code in case of failure. | |
1e51764a AB |
1203 | */ |
1204 | static int mount_ubifs(struct ubifs_info *c) | |
1205 | { | |
2ef13294 | 1206 | int err; |
3668b70f | 1207 | long long x, y; |
1e51764a AB |
1208 | size_t sz; |
1209 | ||
bc98a42c | 1210 | c->ro_mount = !!sb_rdonly(c->vfs_sb); |
1751e8a6 LT |
1211 | /* Suppress error messages while probing if SB_SILENT is set */ |
1212 | c->probing = !!(c->vfs_sb->s_flags & SB_SILENT); | |
90bea5a3 | 1213 | |
1e51764a AB |
1214 | err = init_constants_early(c); |
1215 | if (err) | |
1216 | return err; | |
1217 | ||
17c2f9f8 AB |
1218 | err = ubifs_debugging_init(c); |
1219 | if (err) | |
1220 | return err; | |
1e51764a AB |
1221 | |
1222 | err = check_volume_empty(c); | |
1223 | if (err) | |
1224 | goto out_free; | |
1225 | ||
2ef13294 | 1226 | if (c->empty && (c->ro_mount || c->ro_media)) { |
1e51764a AB |
1227 | /* |
1228 | * This UBI volume is empty, and read-only, or the file system | |
1229 | * is mounted read-only - we cannot format it. | |
1230 | */ | |
235c362b | 1231 | ubifs_err(c, "can't format empty UBI volume: read-only %s", |
1e51764a AB |
1232 | c->ro_media ? "UBI volume" : "mount"); |
1233 | err = -EROFS; | |
1234 | goto out_free; | |
1235 | } | |
1236 | ||
2ef13294 | 1237 | if (c->ro_media && !c->ro_mount) { |
235c362b | 1238 | ubifs_err(c, "cannot mount read-write - read-only media"); |
1e51764a AB |
1239 | err = -EROFS; |
1240 | goto out_free; | |
1241 | } | |
1242 | ||
1243 | /* | |
1244 | * The requirement for the buffer is that it should fit indexing B-tree | |
1245 | * height amount of integers. We assume the height if the TNC tree will | |
1246 | * never exceed 64. | |
1247 | */ | |
1248 | err = -ENOMEM; | |
6da2ec56 KC |
1249 | c->bottom_up_buf = kmalloc_array(BOTTOM_UP_HEIGHT, sizeof(int), |
1250 | GFP_KERNEL); | |
1e51764a AB |
1251 | if (!c->bottom_up_buf) |
1252 | goto out_free; | |
1253 | ||
1254 | c->sbuf = vmalloc(c->leb_size); | |
1255 | if (!c->sbuf) | |
1256 | goto out_free; | |
1257 | ||
2ef13294 | 1258 | if (!c->ro_mount) { |
1e51764a AB |
1259 | c->ileb_buf = vmalloc(c->leb_size); |
1260 | if (!c->ileb_buf) | |
1261 | goto out_free; | |
1262 | } | |
1263 | ||
3477d204 AB |
1264 | if (c->bulk_read == 1) |
1265 | bu_init(c); | |
1266 | ||
d882962f | 1267 | if (!c->ro_mount) { |
7799953b RW |
1268 | c->write_reserve_buf = kmalloc(COMPRESSED_DATA_NODE_BUF_SZ + \ |
1269 | UBIFS_CIPHER_BLOCK_SIZE, | |
d882962f MC |
1270 | GFP_KERNEL); |
1271 | if (!c->write_reserve_buf) | |
1272 | goto out_free; | |
1273 | } | |
1274 | ||
18d1d7fb | 1275 | c->mounting = 1; |
2953e73f | 1276 | |
d8a22773 SH |
1277 | if (c->auth_key_name) { |
1278 | if (IS_ENABLED(CONFIG_UBIFS_FS_AUTHENTICATION)) { | |
1279 | err = ubifs_init_authentication(c); | |
1280 | if (err) | |
1281 | goto out_free; | |
1282 | } else { | |
1283 | ubifs_err(c, "auth_key_name, but UBIFS is built without" | |
1284 | " authentication support"); | |
1285 | err = -EINVAL; | |
1286 | goto out_free; | |
1287 | } | |
1288 | } | |
1289 | ||
1e51764a AB |
1290 | err = ubifs_read_superblock(c); |
1291 | if (err) | |
1292 | goto out_free; | |
1293 | ||
90bea5a3 DG |
1294 | c->probing = 0; |
1295 | ||
1e51764a | 1296 | /* |
553dea4d | 1297 | * Make sure the compressor which is set as default in the superblock |
57a450e9 | 1298 | * or overridden by mount options is actually compiled in. |
1e51764a | 1299 | */ |
6eb61d58 | 1300 | if (!ubifs_compr_present(c, c->default_compr)) { |
235c362b | 1301 | ubifs_err(c, "'compressor \"%s\" is not compiled in", |
6eb61d58 | 1302 | ubifs_compr_name(c, c->default_compr)); |
8eec2f36 | 1303 | err = -ENOTSUPP; |
553dea4d | 1304 | goto out_free; |
1e51764a AB |
1305 | } |
1306 | ||
79807d07 | 1307 | err = init_constants_sb(c); |
1e51764a | 1308 | if (err) |
17c2f9f8 | 1309 | goto out_free; |
1e51764a AB |
1310 | |
1311 | sz = ALIGN(c->max_idx_node_sz, c->min_io_size); | |
1312 | sz = ALIGN(sz + c->max_idx_node_sz, c->min_io_size); | |
1313 | c->cbuf = kmalloc(sz, GFP_NOFS); | |
1314 | if (!c->cbuf) { | |
1315 | err = -ENOMEM; | |
17c2f9f8 | 1316 | goto out_free; |
1e51764a AB |
1317 | } |
1318 | ||
b50b9f40 AB |
1319 | err = alloc_wbufs(c); |
1320 | if (err) | |
1321 | goto out_cbuf; | |
1322 | ||
0855f310 | 1323 | sprintf(c->bgt_name, BGT_NAME_PATTERN, c->vi.ubi_num, c->vi.vol_id); |
2ef13294 | 1324 | if (!c->ro_mount) { |
1e51764a | 1325 | /* Create background thread */ |
fcabb347 | 1326 | c->bgt = kthread_create(ubifs_bg_thread, c, "%s", c->bgt_name); |
1e51764a AB |
1327 | if (IS_ERR(c->bgt)) { |
1328 | err = PTR_ERR(c->bgt); | |
1329 | c->bgt = NULL; | |
235c362b | 1330 | ubifs_err(c, "cannot spawn \"%s\", error %d", |
1e51764a AB |
1331 | c->bgt_name, err); |
1332 | goto out_wbufs; | |
1333 | } | |
1334 | wake_up_process(c->bgt); | |
1335 | } | |
1336 | ||
1337 | err = ubifs_read_master(c); | |
1338 | if (err) | |
1339 | goto out_master; | |
1340 | ||
09801194 BG |
1341 | init_constants_master(c); |
1342 | ||
1e51764a | 1343 | if ((c->mst_node->flags & cpu_to_le32(UBIFS_MST_DIRTY)) != 0) { |
235c362b | 1344 | ubifs_msg(c, "recovery needed"); |
1e51764a | 1345 | c->need_recovery = 1; |
781c5717 BG |
1346 | } |
1347 | ||
781c5717 BG |
1348 | if (c->need_recovery && !c->ro_mount) { |
1349 | err = ubifs_recover_inl_heads(c, c->sbuf); | |
1350 | if (err) | |
1351 | goto out_master; | |
1352 | } | |
1353 | ||
1354 | err = ubifs_lpt_init(c, 1, !c->ro_mount); | |
1355 | if (err) | |
1356 | goto out_master; | |
1357 | ||
09801194 BG |
1358 | if (!c->ro_mount && c->space_fixup) { |
1359 | err = ubifs_fixup_free_space(c); | |
1360 | if (err) | |
56b04e3e | 1361 | goto out_lpt; |
09801194 BG |
1362 | } |
1363 | ||
2c84599c | 1364 | if (!c->ro_mount && !c->need_recovery) { |
1e51764a AB |
1365 | /* |
1366 | * Set the "dirty" flag so that if we reboot uncleanly we | |
1367 | * will notice this immediately on the next mount. | |
1368 | */ | |
1369 | c->mst_node->flags |= cpu_to_le32(UBIFS_MST_DIRTY); | |
1370 | err = ubifs_write_master(c); | |
1371 | if (err) | |
781c5717 | 1372 | goto out_lpt; |
1e51764a AB |
1373 | } |
1374 | ||
b137545c | 1375 | err = dbg_check_idx_size(c, c->bi.old_idx_sz); |
1e51764a AB |
1376 | if (err) |
1377 | goto out_lpt; | |
1378 | ||
1379 | err = ubifs_replay_journal(c); | |
1380 | if (err) | |
1381 | goto out_journal; | |
1382 | ||
1fb8bd01 | 1383 | /* Calculate 'min_idx_lebs' after journal replay */ |
b137545c | 1384 | c->bi.min_idx_lebs = ubifs_calc_min_idx_lebs(c); |
1fb8bd01 | 1385 | |
2ef13294 | 1386 | err = ubifs_mount_orphans(c, c->need_recovery, c->ro_mount); |
1e51764a AB |
1387 | if (err) |
1388 | goto out_orphans; | |
1389 | ||
2ef13294 | 1390 | if (!c->ro_mount) { |
1e51764a AB |
1391 | int lnum; |
1392 | ||
57a450e9 AB |
1393 | err = check_free_space(c); |
1394 | if (err) | |
1e51764a | 1395 | goto out_orphans; |
1e51764a AB |
1396 | |
1397 | /* Check for enough log space */ | |
1398 | lnum = c->lhead_lnum + 1; | |
1399 | if (lnum >= UBIFS_LOG_LNUM + c->log_lebs) | |
1400 | lnum = UBIFS_LOG_LNUM; | |
1401 | if (lnum == c->ltail_lnum) { | |
1402 | err = ubifs_consolidate_log(c); | |
1403 | if (err) | |
1404 | goto out_orphans; | |
1405 | } | |
1406 | ||
1407 | if (c->need_recovery) { | |
1e76592f SH |
1408 | if (!ubifs_authenticated(c)) { |
1409 | err = ubifs_recover_size(c, true); | |
1410 | if (err) | |
1411 | goto out_orphans; | |
1412 | } | |
1413 | ||
1e51764a | 1414 | err = ubifs_rcvry_gc_commit(c); |
276de5d2 AB |
1415 | if (err) |
1416 | goto out_orphans; | |
1e76592f SH |
1417 | |
1418 | if (ubifs_authenticated(c)) { | |
1419 | err = ubifs_recover_size(c, false); | |
1420 | if (err) | |
1421 | goto out_orphans; | |
1422 | } | |
b4978e94 | 1423 | } else { |
1e51764a | 1424 | err = take_gc_lnum(c); |
b4978e94 AB |
1425 | if (err) |
1426 | goto out_orphans; | |
1427 | ||
1428 | /* | |
1429 | * GC LEB may contain garbage if there was an unclean | |
1430 | * reboot, and it should be un-mapped. | |
1431 | */ | |
1432 | err = ubifs_leb_unmap(c, c->gc_lnum); | |
1433 | if (err) | |
c18de72f | 1434 | goto out_orphans; |
b4978e94 | 1435 | } |
1e51764a AB |
1436 | |
1437 | err = dbg_check_lprops(c); | |
1438 | if (err) | |
1439 | goto out_orphans; | |
1440 | } else if (c->need_recovery) { | |
1e76592f | 1441 | err = ubifs_recover_size(c, false); |
1e51764a AB |
1442 | if (err) |
1443 | goto out_orphans; | |
b4978e94 AB |
1444 | } else { |
1445 | /* | |
1446 | * Even if we mount read-only, we have to set space in GC LEB | |
1447 | * to proper value because this affects UBIFS free space | |
1448 | * reporting. We do not want to have a situation when | |
1449 | * re-mounting from R/O to R/W changes amount of free space. | |
1450 | */ | |
1451 | err = take_gc_lnum(c); | |
1452 | if (err) | |
1453 | goto out_orphans; | |
1e51764a AB |
1454 | } |
1455 | ||
1456 | spin_lock(&ubifs_infos_lock); | |
1457 | list_add_tail(&c->infos_list, &ubifs_infos); | |
1458 | spin_unlock(&ubifs_infos_lock); | |
1459 | ||
1460 | if (c->need_recovery) { | |
2ef13294 | 1461 | if (c->ro_mount) |
235c362b | 1462 | ubifs_msg(c, "recovery deferred"); |
1e51764a AB |
1463 | else { |
1464 | c->need_recovery = 0; | |
235c362b | 1465 | ubifs_msg(c, "recovery completed"); |
b221337a AB |
1466 | /* |
1467 | * GC LEB has to be empty and taken at this point. But | |
1468 | * the journal head LEBs may also be accounted as | |
1469 | * "empty taken" if they are empty. | |
1470 | */ | |
6eb61d58 | 1471 | ubifs_assert(c, c->lst.taken_empty_lebs > 0); |
1e51764a | 1472 | } |
6ba87c9b | 1473 | } else |
6eb61d58 | 1474 | ubifs_assert(c, c->lst.taken_empty_lebs > 0); |
1e51764a | 1475 | |
6ba87c9b | 1476 | err = dbg_check_filesystem(c); |
552ff317 AB |
1477 | if (err) |
1478 | goto out_infos; | |
1479 | ||
6ba87c9b | 1480 | err = dbg_debugfs_init_fs(c); |
1e51764a AB |
1481 | if (err) |
1482 | goto out_infos; | |
1483 | ||
18d1d7fb | 1484 | c->mounting = 0; |
2953e73f | 1485 | |
235c362b | 1486 | ubifs_msg(c, "UBIFS: mounted UBI device %d, volume %d, name \"%s\"%s", |
3668b70f | 1487 | c->vi.ubi_num, c->vi.vol_id, c->vi.name, |
beadadfa | 1488 | c->ro_mount ? ", R/O mode" : ""); |
1e51764a | 1489 | x = (long long)c->main_lebs * c->leb_size; |
3668b70f | 1490 | y = (long long)c->log_lebs * c->leb_size + c->max_bud_bytes; |
235c362b | 1491 | ubifs_msg(c, "LEB size: %d bytes (%d KiB), min./max. I/O unit sizes: %d bytes/%d bytes", |
3668b70f AB |
1492 | c->leb_size, c->leb_size >> 10, c->min_io_size, |
1493 | c->max_write_size); | |
235c362b | 1494 | ubifs_msg(c, "FS size: %lld bytes (%lld MiB, %d LEBs), journal size %lld bytes (%lld MiB, %d LEBs)", |
3668b70f AB |
1495 | x, x >> 20, c->main_lebs, |
1496 | y, y >> 20, c->log_lebs + c->max_bud_cnt); | |
235c362b | 1497 | ubifs_msg(c, "reserved for root: %llu bytes (%llu KiB)", |
3668b70f | 1498 | c->report_rp_size, c->report_rp_size >> 10); |
235c362b | 1499 | ubifs_msg(c, "media format: w%d/r%d (latest is w%d/r%d), UUID %pUB%s", |
963f0cf6 | 1500 | c->fmt_version, c->ro_compat_version, |
3668b70f AB |
1501 | UBIFS_FORMAT_VERSION, UBIFS_RO_COMPAT_VERSION, c->uuid, |
1502 | c->big_lpt ? ", big LPT model" : ", small LPT model"); | |
1503 | ||
6eb61d58 | 1504 | dbg_gen("default compressor: %s", ubifs_compr_name(c, c->default_compr)); |
3668b70f | 1505 | dbg_gen("data journal heads: %d", |
1e51764a | 1506 | c->jhead_cnt - NONDATA_JHEADS_CNT); |
3668b70f | 1507 | dbg_gen("log LEBs: %d (%d - %d)", |
1e51764a | 1508 | c->log_lebs, UBIFS_LOG_LNUM, c->log_last); |
3668b70f | 1509 | dbg_gen("LPT area LEBs: %d (%d - %d)", |
1e51764a | 1510 | c->lpt_lebs, c->lpt_first, c->lpt_last); |
3668b70f | 1511 | dbg_gen("orphan area LEBs: %d (%d - %d)", |
1e51764a | 1512 | c->orph_lebs, c->orph_first, c->orph_last); |
3668b70f | 1513 | dbg_gen("main area LEBs: %d (%d - %d)", |
1e51764a | 1514 | c->main_lebs, c->main_first, c->leb_cnt - 1); |
3668b70f AB |
1515 | dbg_gen("index LEBs: %d", c->lst.idx_lebs); |
1516 | dbg_gen("total index bytes: %lld (%lld KiB, %lld MiB)", | |
b137545c AB |
1517 | c->bi.old_idx_sz, c->bi.old_idx_sz >> 10, |
1518 | c->bi.old_idx_sz >> 20); | |
3668b70f AB |
1519 | dbg_gen("key hash type: %d", c->key_hash_type); |
1520 | dbg_gen("tree fanout: %d", c->fanout); | |
1521 | dbg_gen("reserved GC LEB: %d", c->gc_lnum); | |
1522 | dbg_gen("max. znode size %d", c->max_znode_sz); | |
1523 | dbg_gen("max. index node size %d", c->max_idx_node_sz); | |
1524 | dbg_gen("node sizes: data %zu, inode %zu, dentry %zu", | |
8e5033ad | 1525 | UBIFS_DATA_NODE_SZ, UBIFS_INO_NODE_SZ, UBIFS_DENT_NODE_SZ); |
3668b70f | 1526 | dbg_gen("node sizes: trun %zu, sb %zu, master %zu", |
8e5033ad | 1527 | UBIFS_TRUN_NODE_SZ, UBIFS_SB_NODE_SZ, UBIFS_MST_NODE_SZ); |
3668b70f | 1528 | dbg_gen("node sizes: ref %zu, cmt. start %zu, orph %zu", |
8e5033ad | 1529 | UBIFS_REF_NODE_SZ, UBIFS_CS_NODE_SZ, UBIFS_ORPH_NODE_SZ); |
3668b70f | 1530 | dbg_gen("max. node sizes: data %zu, inode %zu dentry %zu, idx %d", |
c4361570 | 1531 | UBIFS_MAX_DATA_NODE_SZ, UBIFS_MAX_INO_NODE_SZ, |
6342aaeb | 1532 | UBIFS_MAX_DENT_NODE_SZ, ubifs_idx_node_sz(c, c->fanout)); |
3668b70f AB |
1533 | dbg_gen("dead watermark: %d", c->dead_wm); |
1534 | dbg_gen("dark watermark: %d", c->dark_wm); | |
1535 | dbg_gen("LEB overhead: %d", c->leb_overhead); | |
1e51764a | 1536 | x = (long long)c->main_lebs * c->dark_wm; |
3668b70f | 1537 | dbg_gen("max. dark space: %lld (%lld KiB, %lld MiB)", |
1e51764a | 1538 | x, x >> 10, x >> 20); |
3668b70f | 1539 | dbg_gen("maximum bud bytes: %lld (%lld KiB, %lld MiB)", |
1e51764a AB |
1540 | c->max_bud_bytes, c->max_bud_bytes >> 10, |
1541 | c->max_bud_bytes >> 20); | |
3668b70f | 1542 | dbg_gen("BG commit bud bytes: %lld (%lld KiB, %lld MiB)", |
1e51764a AB |
1543 | c->bg_bud_bytes, c->bg_bud_bytes >> 10, |
1544 | c->bg_bud_bytes >> 20); | |
3668b70f | 1545 | dbg_gen("current bud bytes %lld (%lld KiB, %lld MiB)", |
1e51764a | 1546 | c->bud_bytes, c->bud_bytes >> 10, c->bud_bytes >> 20); |
3668b70f AB |
1547 | dbg_gen("max. seq. number: %llu", c->max_sqnum); |
1548 | dbg_gen("commit number: %llu", c->cmt_no); | |
9ca2d732 RW |
1549 | dbg_gen("max. xattrs per inode: %d", ubifs_xattr_max_cnt(c)); |
1550 | dbg_gen("max orphans: %d", c->max_orphans); | |
1e51764a AB |
1551 | |
1552 | return 0; | |
1553 | ||
1554 | out_infos: | |
1555 | spin_lock(&ubifs_infos_lock); | |
1556 | list_del(&c->infos_list); | |
1557 | spin_unlock(&ubifs_infos_lock); | |
1558 | out_orphans: | |
1559 | free_orphans(c); | |
1560 | out_journal: | |
1561 | destroy_journal(c); | |
1562 | out_lpt: | |
1563 | ubifs_lpt_free(c, 0); | |
1564 | out_master: | |
1565 | kfree(c->mst_node); | |
1566 | kfree(c->rcvrd_mst_node); | |
1567 | if (c->bgt) | |
1568 | kthread_stop(c->bgt); | |
1569 | out_wbufs: | |
1570 | free_wbufs(c); | |
1571 | out_cbuf: | |
1572 | kfree(c->cbuf); | |
1e51764a | 1573 | out_free: |
d882962f | 1574 | kfree(c->write_reserve_buf); |
3477d204 | 1575 | kfree(c->bu.buf); |
1e51764a AB |
1576 | vfree(c->ileb_buf); |
1577 | vfree(c->sbuf); | |
1578 | kfree(c->bottom_up_buf); | |
17c2f9f8 | 1579 | ubifs_debugging_exit(c); |
1e51764a AB |
1580 | return err; |
1581 | } | |
1582 | ||
1583 | /** | |
1584 | * ubifs_umount - un-mount UBIFS file-system. | |
1585 | * @c: UBIFS file-system description object | |
1586 | * | |
1587 | * Note, this function is called to free allocated resourced when un-mounting, | |
1588 | * as well as free resources when an error occurred while we were half way | |
1589 | * through mounting (error path cleanup function). So it has to make sure the | |
1590 | * resource was actually allocated before freeing it. | |
1591 | */ | |
1592 | static void ubifs_umount(struct ubifs_info *c) | |
1593 | { | |
1594 | dbg_gen("un-mounting UBI device %d, volume %d", c->vi.ubi_num, | |
1595 | c->vi.vol_id); | |
1596 | ||
552ff317 | 1597 | dbg_debugfs_exit_fs(c); |
1e51764a AB |
1598 | spin_lock(&ubifs_infos_lock); |
1599 | list_del(&c->infos_list); | |
1600 | spin_unlock(&ubifs_infos_lock); | |
1601 | ||
1602 | if (c->bgt) | |
1603 | kthread_stop(c->bgt); | |
1604 | ||
1605 | destroy_journal(c); | |
1606 | free_wbufs(c); | |
1607 | free_orphans(c); | |
1608 | ubifs_lpt_free(c, 0); | |
d8a22773 | 1609 | ubifs_exit_authentication(c); |
1e51764a | 1610 | |
d8a22773 SH |
1611 | kfree(c->auth_key_name); |
1612 | kfree(c->auth_hash_name); | |
1e51764a AB |
1613 | kfree(c->cbuf); |
1614 | kfree(c->rcvrd_mst_node); | |
1615 | kfree(c->mst_node); | |
d882962f | 1616 | kfree(c->write_reserve_buf); |
3477d204 AB |
1617 | kfree(c->bu.buf); |
1618 | vfree(c->ileb_buf); | |
1e51764a AB |
1619 | vfree(c->sbuf); |
1620 | kfree(c->bottom_up_buf); | |
17c2f9f8 | 1621 | ubifs_debugging_exit(c); |
1e51764a AB |
1622 | } |
1623 | ||
1624 | /** | |
1625 | * ubifs_remount_rw - re-mount in read-write mode. | |
1626 | * @c: UBIFS file-system description object | |
1627 | * | |
1628 | * UBIFS avoids allocating many unnecessary resources when mounted in read-only | |
1629 | * mode. This function allocates the needed resources and re-mounts UBIFS in | |
1630 | * read-write mode. | |
1631 | */ | |
1632 | static int ubifs_remount_rw(struct ubifs_info *c) | |
1633 | { | |
1634 | int err, lnum; | |
1635 | ||
963f0cf6 | 1636 | if (c->rw_incompat) { |
235c362b SY |
1637 | ubifs_err(c, "the file-system is not R/W-compatible"); |
1638 | ubifs_msg(c, "on-flash format version is w%d/r%d, but software only supports up to version w%d/r%d", | |
79fda517 AB |
1639 | c->fmt_version, c->ro_compat_version, |
1640 | UBIFS_FORMAT_VERSION, UBIFS_RO_COMPAT_VERSION); | |
963f0cf6 AB |
1641 | return -EROFS; |
1642 | } | |
1643 | ||
1e51764a | 1644 | mutex_lock(&c->umount_mutex); |
84abf972 | 1645 | dbg_save_space_info(c); |
1e51764a | 1646 | c->remounting_rw = 1; |
c88ac00c | 1647 | c->ro_mount = 0; |
1e51764a | 1648 | |
67e753ca AB |
1649 | if (c->space_fixup) { |
1650 | err = ubifs_fixup_free_space(c); | |
1651 | if (err) | |
fcdd57c8 | 1652 | goto out; |
67e753ca AB |
1653 | } |
1654 | ||
57a450e9 AB |
1655 | err = check_free_space(c); |
1656 | if (err) | |
1e51764a | 1657 | goto out; |
1e51764a AB |
1658 | |
1659 | if (c->old_leb_cnt != c->leb_cnt) { | |
fd615005 | 1660 | struct ubifs_sb_node *sup = c->sup_node; |
1e51764a | 1661 | |
1e51764a AB |
1662 | sup->leb_cnt = cpu_to_le32(c->leb_cnt); |
1663 | err = ubifs_write_sb_node(c, sup); | |
1664 | if (err) | |
1665 | goto out; | |
1666 | } | |
1667 | ||
1668 | if (c->need_recovery) { | |
235c362b | 1669 | ubifs_msg(c, "completing deferred recovery"); |
1e51764a AB |
1670 | err = ubifs_write_rcvrd_mst_node(c); |
1671 | if (err) | |
1672 | goto out; | |
1e76592f SH |
1673 | if (!ubifs_authenticated(c)) { |
1674 | err = ubifs_recover_size(c, true); | |
1675 | if (err) | |
1676 | goto out; | |
1677 | } | |
1e51764a AB |
1678 | err = ubifs_clean_lebs(c, c->sbuf); |
1679 | if (err) | |
1680 | goto out; | |
1681 | err = ubifs_recover_inl_heads(c, c->sbuf); | |
1682 | if (err) | |
1683 | goto out; | |
49d128aa AH |
1684 | } else { |
1685 | /* A readonly mount is not allowed to have orphans */ | |
6eb61d58 | 1686 | ubifs_assert(c, c->tot_orphans == 0); |
49d128aa AH |
1687 | err = ubifs_clear_orphans(c); |
1688 | if (err) | |
1689 | goto out; | |
1e51764a AB |
1690 | } |
1691 | ||
1692 | if (!(c->mst_node->flags & cpu_to_le32(UBIFS_MST_DIRTY))) { | |
1693 | c->mst_node->flags |= cpu_to_le32(UBIFS_MST_DIRTY); | |
1694 | err = ubifs_write_master(c); | |
1695 | if (err) | |
1696 | goto out; | |
1697 | } | |
1698 | ||
1699 | c->ileb_buf = vmalloc(c->leb_size); | |
1700 | if (!c->ileb_buf) { | |
1701 | err = -ENOMEM; | |
1702 | goto out; | |
1703 | } | |
1704 | ||
7799953b RW |
1705 | c->write_reserve_buf = kmalloc(COMPRESSED_DATA_NODE_BUF_SZ + \ |
1706 | UBIFS_CIPHER_BLOCK_SIZE, GFP_KERNEL); | |
7203db97 WY |
1707 | if (!c->write_reserve_buf) { |
1708 | err = -ENOMEM; | |
d882962f | 1709 | goto out; |
7203db97 | 1710 | } |
d882962f | 1711 | |
1e51764a AB |
1712 | err = ubifs_lpt_init(c, 0, 1); |
1713 | if (err) | |
1714 | goto out; | |
1715 | ||
1e51764a | 1716 | /* Create background thread */ |
fcabb347 | 1717 | c->bgt = kthread_create(ubifs_bg_thread, c, "%s", c->bgt_name); |
1e51764a AB |
1718 | if (IS_ERR(c->bgt)) { |
1719 | err = PTR_ERR(c->bgt); | |
1720 | c->bgt = NULL; | |
235c362b | 1721 | ubifs_err(c, "cannot spawn \"%s\", error %d", |
1e51764a | 1722 | c->bgt_name, err); |
2953e73f | 1723 | goto out; |
1e51764a AB |
1724 | } |
1725 | wake_up_process(c->bgt); | |
1726 | ||
1727 | c->orph_buf = vmalloc(c->leb_size); | |
2953e73f AH |
1728 | if (!c->orph_buf) { |
1729 | err = -ENOMEM; | |
1730 | goto out; | |
1731 | } | |
1e51764a AB |
1732 | |
1733 | /* Check for enough log space */ | |
1734 | lnum = c->lhead_lnum + 1; | |
1735 | if (lnum >= UBIFS_LOG_LNUM + c->log_lebs) | |
1736 | lnum = UBIFS_LOG_LNUM; | |
1737 | if (lnum == c->ltail_lnum) { | |
1738 | err = ubifs_consolidate_log(c); | |
1739 | if (err) | |
1740 | goto out; | |
1741 | } | |
1742 | ||
1e76592f | 1743 | if (c->need_recovery) { |
1e51764a | 1744 | err = ubifs_rcvry_gc_commit(c); |
1e76592f SH |
1745 | if (err) |
1746 | goto out; | |
1747 | ||
1748 | if (ubifs_authenticated(c)) { | |
1749 | err = ubifs_recover_size(c, false); | |
1750 | if (err) | |
1751 | goto out; | |
1752 | } | |
1753 | } else { | |
b4978e94 | 1754 | err = ubifs_leb_unmap(c, c->gc_lnum); |
1e76592f | 1755 | } |
1e51764a AB |
1756 | if (err) |
1757 | goto out; | |
1758 | ||
8c230d9a AB |
1759 | dbg_gen("re-mounted read-write"); |
1760 | c->remounting_rw = 0; | |
1761 | ||
1e51764a AB |
1762 | if (c->need_recovery) { |
1763 | c->need_recovery = 0; | |
235c362b | 1764 | ubifs_msg(c, "deferred recovery completed"); |
8c230d9a AB |
1765 | } else { |
1766 | /* | |
1767 | * Do not run the debugging space check if the were doing | |
1768 | * recovery, because when we saved the information we had the | |
1769 | * file-system in a state where the TNC and lprops has been | |
1770 | * modified in memory, but all the I/O operations (including a | |
1771 | * commit) were deferred. So the file-system was in | |
1772 | * "non-committed" state. Now the file-system is in committed | |
1773 | * state, and of course the amount of free space will change | |
1774 | * because, for example, the old index size was imprecise. | |
1775 | */ | |
1776 | err = dbg_check_space_info(c); | |
1e51764a | 1777 | } |
9d510db4 | 1778 | |
1e51764a | 1779 | mutex_unlock(&c->umount_mutex); |
84abf972 | 1780 | return err; |
1e51764a AB |
1781 | |
1782 | out: | |
c88ac00c | 1783 | c->ro_mount = 1; |
1e51764a AB |
1784 | vfree(c->orph_buf); |
1785 | c->orph_buf = NULL; | |
1786 | if (c->bgt) { | |
1787 | kthread_stop(c->bgt); | |
1788 | c->bgt = NULL; | |
1789 | } | |
1790 | free_wbufs(c); | |
d882962f MC |
1791 | kfree(c->write_reserve_buf); |
1792 | c->write_reserve_buf = NULL; | |
1e51764a AB |
1793 | vfree(c->ileb_buf); |
1794 | c->ileb_buf = NULL; | |
1795 | ubifs_lpt_free(c, 1); | |
1796 | c->remounting_rw = 0; | |
1797 | mutex_unlock(&c->umount_mutex); | |
1798 | return err; | |
1799 | } | |
1800 | ||
1e51764a AB |
1801 | /** |
1802 | * ubifs_remount_ro - re-mount in read-only mode. | |
1803 | * @c: UBIFS file-system description object | |
1804 | * | |
84abf972 AB |
1805 | * We assume VFS has stopped writing. Possibly the background thread could be |
1806 | * running a commit, however kthread_stop will wait in that case. | |
1e51764a AB |
1807 | */ |
1808 | static void ubifs_remount_ro(struct ubifs_info *c) | |
1809 | { | |
1810 | int i, err; | |
1811 | ||
6eb61d58 RW |
1812 | ubifs_assert(c, !c->need_recovery); |
1813 | ubifs_assert(c, !c->ro_mount); | |
e4d9b6cb | 1814 | |
1e51764a AB |
1815 | mutex_lock(&c->umount_mutex); |
1816 | if (c->bgt) { | |
1817 | kthread_stop(c->bgt); | |
1818 | c->bgt = NULL; | |
1819 | } | |
1820 | ||
84abf972 AB |
1821 | dbg_save_space_info(c); |
1822 | ||
aac17948 RW |
1823 | for (i = 0; i < c->jhead_cnt; i++) { |
1824 | err = ubifs_wbuf_sync(&c->jheads[i].wbuf); | |
1825 | if (err) | |
1826 | ubifs_ro_mode(c, err); | |
1827 | } | |
1e51764a | 1828 | |
e4d9b6cb AB |
1829 | c->mst_node->flags &= ~cpu_to_le32(UBIFS_MST_DIRTY); |
1830 | c->mst_node->flags |= cpu_to_le32(UBIFS_MST_NO_ORPHS); | |
1831 | c->mst_node->gc_lnum = cpu_to_le32(c->gc_lnum); | |
1832 | err = ubifs_write_master(c); | |
1833 | if (err) | |
1834 | ubifs_ro_mode(c, err); | |
1835 | ||
1e51764a AB |
1836 | vfree(c->orph_buf); |
1837 | c->orph_buf = NULL; | |
d882962f MC |
1838 | kfree(c->write_reserve_buf); |
1839 | c->write_reserve_buf = NULL; | |
1e51764a AB |
1840 | vfree(c->ileb_buf); |
1841 | c->ileb_buf = NULL; | |
1842 | ubifs_lpt_free(c, 1); | |
2ef13294 | 1843 | c->ro_mount = 1; |
84abf972 AB |
1844 | err = dbg_check_space_info(c); |
1845 | if (err) | |
1846 | ubifs_ro_mode(c, err); | |
1e51764a AB |
1847 | mutex_unlock(&c->umount_mutex); |
1848 | } | |
1849 | ||
1850 | static void ubifs_put_super(struct super_block *sb) | |
1851 | { | |
1852 | int i; | |
1853 | struct ubifs_info *c = sb->s_fs_info; | |
1854 | ||
235c362b | 1855 | ubifs_msg(c, "un-mount UBI device %d", c->vi.ubi_num); |
6cfd0148 | 1856 | |
1e51764a AB |
1857 | /* |
1858 | * The following asserts are only valid if there has not been a failure | |
1859 | * of the media. For example, there will be dirty inodes if we failed | |
1860 | * to write them back because of I/O errors. | |
1861 | */ | |
1a067a22 | 1862 | if (!c->ro_error) { |
6eb61d58 RW |
1863 | ubifs_assert(c, c->bi.idx_growth == 0); |
1864 | ubifs_assert(c, c->bi.dd_growth == 0); | |
1865 | ubifs_assert(c, c->bi.data_growth == 0); | |
1a067a22 | 1866 | } |
1e51764a AB |
1867 | |
1868 | /* | |
1869 | * The 'c->umount_lock' prevents races between UBIFS memory shrinker | |
1870 | * and file system un-mount. Namely, it prevents the shrinker from | |
1871 | * picking this superblock for shrinking - it will be just skipped if | |
1872 | * the mutex is locked. | |
1873 | */ | |
1874 | mutex_lock(&c->umount_mutex); | |
2ef13294 | 1875 | if (!c->ro_mount) { |
1e51764a AB |
1876 | /* |
1877 | * First of all kill the background thread to make sure it does | |
1878 | * not interfere with un-mounting and freeing resources. | |
1879 | */ | |
1880 | if (c->bgt) { | |
1881 | kthread_stop(c->bgt); | |
1882 | c->bgt = NULL; | |
1883 | } | |
1884 | ||
1e51764a | 1885 | /* |
2680d722 | 1886 | * On fatal errors c->ro_error is set to 1, in which case we do |
1e51764a AB |
1887 | * not write the master node. |
1888 | */ | |
2680d722 | 1889 | if (!c->ro_error) { |
2ef13294 AB |
1890 | int err; |
1891 | ||
1892 | /* Synchronize write-buffers */ | |
aac17948 RW |
1893 | for (i = 0; i < c->jhead_cnt; i++) { |
1894 | err = ubifs_wbuf_sync(&c->jheads[i].wbuf); | |
1895 | if (err) | |
1896 | ubifs_ro_mode(c, err); | |
1897 | } | |
2ef13294 | 1898 | |
1e51764a AB |
1899 | /* |
1900 | * We are being cleanly unmounted which means the | |
1901 | * orphans were killed - indicate this in the master | |
1902 | * node. Also save the reserved GC LEB number. | |
1903 | */ | |
1e51764a AB |
1904 | c->mst_node->flags &= ~cpu_to_le32(UBIFS_MST_DIRTY); |
1905 | c->mst_node->flags |= cpu_to_le32(UBIFS_MST_NO_ORPHS); | |
1906 | c->mst_node->gc_lnum = cpu_to_le32(c->gc_lnum); | |
1907 | err = ubifs_write_master(c); | |
1908 | if (err) | |
1909 | /* | |
1910 | * Recovery will attempt to fix the master area | |
1911 | * next mount, so we just print a message and | |
1912 | * continue to unmount normally. | |
1913 | */ | |
235c362b | 1914 | ubifs_err(c, "failed to write master node, error %d", |
79fda517 | 1915 | err); |
3601ba27 AB |
1916 | } else { |
1917 | for (i = 0; i < c->jhead_cnt; i++) | |
1918 | /* Make sure write-buffer timers are canceled */ | |
1919 | hrtimer_cancel(&c->jheads[i].wbuf.timer); | |
1e51764a AB |
1920 | } |
1921 | } | |
1922 | ||
1923 | ubifs_umount(c); | |
1e51764a AB |
1924 | ubi_close_volume(c->ubi); |
1925 | mutex_unlock(&c->umount_mutex); | |
1e51764a AB |
1926 | } |
1927 | ||
1928 | static int ubifs_remount_fs(struct super_block *sb, int *flags, char *data) | |
1929 | { | |
1930 | int err; | |
1931 | struct ubifs_info *c = sb->s_fs_info; | |
1932 | ||
02b9984d | 1933 | sync_filesystem(sb); |
1e51764a AB |
1934 | dbg_gen("old flags %#lx, new flags %#x", sb->s_flags, *flags); |
1935 | ||
1936 | err = ubifs_parse_options(c, data, 1); | |
1937 | if (err) { | |
235c362b | 1938 | ubifs_err(c, "invalid or unknown remount parameter"); |
1e51764a AB |
1939 | return err; |
1940 | } | |
3477d204 | 1941 | |
1751e8a6 | 1942 | if (c->ro_mount && !(*flags & SB_RDONLY)) { |
2680d722 | 1943 | if (c->ro_error) { |
235c362b | 1944 | ubifs_msg(c, "cannot re-mount R/W due to prior errors"); |
2680d722 AB |
1945 | return -EROFS; |
1946 | } | |
e4d9b6cb | 1947 | if (c->ro_media) { |
235c362b | 1948 | ubifs_msg(c, "cannot re-mount R/W - UBI volume is R/O"); |
a2b9df3f | 1949 | return -EROFS; |
e4d9b6cb | 1950 | } |
1e51764a | 1951 | err = ubifs_remount_rw(c); |
e9d6bbc4 | 1952 | if (err) |
1e51764a | 1953 | return err; |
1751e8a6 | 1954 | } else if (!c->ro_mount && (*flags & SB_RDONLY)) { |
2680d722 | 1955 | if (c->ro_error) { |
235c362b | 1956 | ubifs_msg(c, "cannot re-mount R/O due to prior errors"); |
a2b9df3f | 1957 | return -EROFS; |
b466f17d | 1958 | } |
1e51764a | 1959 | ubifs_remount_ro(c); |
b466f17d | 1960 | } |
1e51764a | 1961 | |
3477d204 AB |
1962 | if (c->bulk_read == 1) |
1963 | bu_init(c); | |
1964 | else { | |
1965 | dbg_gen("disable bulk-read"); | |
07d41c3c | 1966 | mutex_lock(&c->bu_mutex); |
3477d204 AB |
1967 | kfree(c->bu.buf); |
1968 | c->bu.buf = NULL; | |
07d41c3c | 1969 | mutex_unlock(&c->bu_mutex); |
3477d204 AB |
1970 | } |
1971 | ||
d3bdc016 SH |
1972 | if (!c->need_recovery) |
1973 | ubifs_assert(c, c->lst.taken_empty_lebs > 0); | |
1974 | ||
1e51764a AB |
1975 | return 0; |
1976 | } | |
1977 | ||
e8b81566 | 1978 | const struct super_operations ubifs_super_operations = { |
1e51764a | 1979 | .alloc_inode = ubifs_alloc_inode, |
dc431759 | 1980 | .free_inode = ubifs_free_inode, |
1e51764a AB |
1981 | .put_super = ubifs_put_super, |
1982 | .write_inode = ubifs_write_inode, | |
d640e1b5 | 1983 | .evict_inode = ubifs_evict_inode, |
1e51764a AB |
1984 | .statfs = ubifs_statfs, |
1985 | .dirty_inode = ubifs_dirty_inode, | |
1986 | .remount_fs = ubifs_remount_fs, | |
1987 | .show_options = ubifs_show_options, | |
1988 | .sync_fs = ubifs_sync_fs, | |
1989 | }; | |
1990 | ||
1991 | /** | |
1992 | * open_ubi - parse UBI device name string and open the UBI device. | |
1993 | * @name: UBI volume name | |
1994 | * @mode: UBI volume open mode | |
1995 | * | |
9722324e CC |
1996 | * The primary method of mounting UBIFS is by specifying the UBI volume |
1997 | * character device node path. However, UBIFS may also be mounted withoug any | |
1998 | * character device node using one of the following methods: | |
1999 | * | |
2000 | * o ubiX_Y - mount UBI device number X, volume Y; | |
2001 | * o ubiY - mount UBI device number 0, volume Y; | |
1e51764a AB |
2002 | * o ubiX:NAME - mount UBI device X, volume with name NAME; |
2003 | * o ubi:NAME - mount UBI device 0, volume with name NAME. | |
2004 | * | |
2005 | * Alternative '!' separator may be used instead of ':' (because some shells | |
2006 | * like busybox may interpret ':' as an NFS host name separator). This function | |
9722324e CC |
2007 | * returns UBI volume description object in case of success and a negative |
2008 | * error code in case of failure. | |
1e51764a AB |
2009 | */ |
2010 | static struct ubi_volume_desc *open_ubi(const char *name, int mode) | |
2011 | { | |
9722324e | 2012 | struct ubi_volume_desc *ubi; |
1e51764a AB |
2013 | int dev, vol; |
2014 | char *endptr; | |
2015 | ||
37f31b6c RW |
2016 | if (!name || !*name) |
2017 | return ERR_PTR(-EINVAL); | |
2018 | ||
9722324e CC |
2019 | /* First, try to open using the device node path method */ |
2020 | ubi = ubi_open_volume_path(name, mode); | |
2021 | if (!IS_ERR(ubi)) | |
2022 | return ubi; | |
2023 | ||
2024 | /* Try the "nodev" method */ | |
1e51764a AB |
2025 | if (name[0] != 'u' || name[1] != 'b' || name[2] != 'i') |
2026 | return ERR_PTR(-EINVAL); | |
2027 | ||
2028 | /* ubi:NAME method */ | |
2029 | if ((name[3] == ':' || name[3] == '!') && name[4] != '\0') | |
2030 | return ubi_open_volume_nm(0, name + 4, mode); | |
2031 | ||
2032 | if (!isdigit(name[3])) | |
2033 | return ERR_PTR(-EINVAL); | |
2034 | ||
2035 | dev = simple_strtoul(name + 3, &endptr, 0); | |
2036 | ||
2037 | /* ubiY method */ | |
2038 | if (*endptr == '\0') | |
2039 | return ubi_open_volume(0, dev, mode); | |
2040 | ||
2041 | /* ubiX_Y method */ | |
2042 | if (*endptr == '_' && isdigit(endptr[1])) { | |
2043 | vol = simple_strtoul(endptr + 1, &endptr, 0); | |
2044 | if (*endptr != '\0') | |
2045 | return ERR_PTR(-EINVAL); | |
2046 | return ubi_open_volume(dev, vol, mode); | |
2047 | } | |
2048 | ||
2049 | /* ubiX:NAME method */ | |
2050 | if ((*endptr == ':' || *endptr == '!') && endptr[1] != '\0') | |
2051 | return ubi_open_volume_nm(dev, ++endptr, mode); | |
2052 | ||
2053 | return ERR_PTR(-EINVAL); | |
2054 | } | |
2055 | ||
b1c27ab3 AV |
2056 | static struct ubifs_info *alloc_ubifs_info(struct ubi_volume_desc *ubi) |
2057 | { | |
2058 | struct ubifs_info *c; | |
2059 | ||
2060 | c = kzalloc(sizeof(struct ubifs_info), GFP_KERNEL); | |
2061 | if (c) { | |
2062 | spin_lock_init(&c->cnt_lock); | |
2063 | spin_lock_init(&c->cs_lock); | |
2064 | spin_lock_init(&c->buds_lock); | |
2065 | spin_lock_init(&c->space_lock); | |
2066 | spin_lock_init(&c->orphan_lock); | |
2067 | init_rwsem(&c->commit_sem); | |
2068 | mutex_init(&c->lp_mutex); | |
2069 | mutex_init(&c->tnc_mutex); | |
2070 | mutex_init(&c->log_mutex); | |
b1c27ab3 AV |
2071 | mutex_init(&c->umount_mutex); |
2072 | mutex_init(&c->bu_mutex); | |
2073 | mutex_init(&c->write_reserve_mutex); | |
2074 | init_waitqueue_head(&c->cmt_wq); | |
2075 | c->buds = RB_ROOT; | |
2076 | c->old_idx = RB_ROOT; | |
2077 | c->size_tree = RB_ROOT; | |
2078 | c->orph_tree = RB_ROOT; | |
2079 | INIT_LIST_HEAD(&c->infos_list); | |
2080 | INIT_LIST_HEAD(&c->idx_gc); | |
2081 | INIT_LIST_HEAD(&c->replay_list); | |
2082 | INIT_LIST_HEAD(&c->replay_buds); | |
2083 | INIT_LIST_HEAD(&c->uncat_list); | |
2084 | INIT_LIST_HEAD(&c->empty_list); | |
2085 | INIT_LIST_HEAD(&c->freeable_list); | |
2086 | INIT_LIST_HEAD(&c->frdi_idx_list); | |
2087 | INIT_LIST_HEAD(&c->unclean_leb_list); | |
2088 | INIT_LIST_HEAD(&c->old_buds); | |
2089 | INIT_LIST_HEAD(&c->orph_list); | |
2090 | INIT_LIST_HEAD(&c->orph_new); | |
2091 | c->no_chk_data_crc = 1; | |
99a24e02 | 2092 | c->assert_action = ASSACT_RO; |
b1c27ab3 AV |
2093 | |
2094 | c->highest_inum = UBIFS_FIRST_INO; | |
2095 | c->lhead_lnum = c->ltail_lnum = UBIFS_LOG_LNUM; | |
2096 | ||
2097 | ubi_get_volume_info(ubi, &c->vi); | |
2098 | ubi_get_device_info(c->vi.ubi_num, &c->di); | |
2099 | } | |
2100 | return c; | |
2101 | } | |
2102 | ||
1e51764a AB |
2103 | static int ubifs_fill_super(struct super_block *sb, void *data, int silent) |
2104 | { | |
d251ed27 | 2105 | struct ubifs_info *c = sb->s_fs_info; |
1e51764a AB |
2106 | struct inode *root; |
2107 | int err; | |
2108 | ||
8379ea31 | 2109 | c->vfs_sb = sb; |
1e51764a AB |
2110 | /* Re-open the UBI device in read-write mode */ |
2111 | c->ubi = ubi_open_volume(c->vi.ubi_num, c->vi.vol_id, UBI_READWRITE); | |
2112 | if (IS_ERR(c->ubi)) { | |
2113 | err = PTR_ERR(c->ubi); | |
d251ed27 | 2114 | goto out; |
1e51764a AB |
2115 | } |
2116 | ||
99edd458 JK |
2117 | err = ubifs_parse_options(c, data, 0); |
2118 | if (err) | |
2119 | goto out_close; | |
2120 | ||
1e51764a | 2121 | /* |
0a883a05 | 2122 | * UBIFS provides 'backing_dev_info' in order to disable read-ahead. For |
1e51764a AB |
2123 | * UBIFS, I/O is not deferred, it is done immediately in readpage, |
2124 | * which means the user would have to wait not just for their own I/O | |
0a883a05 | 2125 | * but the read-ahead I/O as well i.e. completely pointless. |
1e51764a | 2126 | * |
99edd458 JK |
2127 | * Read-ahead will be disabled because @sb->s_bdi->ra_pages is 0. Also |
2128 | * @sb->s_bdi->capabilities are initialized to 0 so there won't be any | |
2129 | * writeback happening. | |
1e51764a | 2130 | */ |
99edd458 JK |
2131 | err = super_setup_bdi_name(sb, "ubifs_%d_%d", c->vi.ubi_num, |
2132 | c->vi.vol_id); | |
1e51764a AB |
2133 | if (err) |
2134 | goto out_close; | |
1e51764a | 2135 | |
1e51764a AB |
2136 | sb->s_fs_info = c; |
2137 | sb->s_magic = UBIFS_SUPER_MAGIC; | |
2138 | sb->s_blocksize = UBIFS_BLOCK_SIZE; | |
2139 | sb->s_blocksize_bits = UBIFS_BLOCK_SHIFT; | |
1e51764a AB |
2140 | sb->s_maxbytes = c->max_inode_sz = key_max_inode_size(c); |
2141 | if (c->max_inode_sz > MAX_LFS_FILESIZE) | |
2142 | sb->s_maxbytes = c->max_inode_sz = MAX_LFS_FILESIZE; | |
2143 | sb->s_op = &ubifs_super_operations; | |
7e5471ce | 2144 | #ifdef CONFIG_UBIFS_FS_XATTR |
2b88fc21 | 2145 | sb->s_xattr = ubifs_xattr_handlers; |
7e5471ce | 2146 | #endif |
eea2c05d | 2147 | fscrypt_set_ops(sb, &ubifs_crypt_operations); |
1e51764a AB |
2148 | |
2149 | mutex_lock(&c->umount_mutex); | |
2150 | err = mount_ubifs(c); | |
2151 | if (err) { | |
6eb61d58 | 2152 | ubifs_assert(c, err < 0); |
1e51764a AB |
2153 | goto out_unlock; |
2154 | } | |
2155 | ||
2156 | /* Read the root inode */ | |
2157 | root = ubifs_iget(sb, UBIFS_ROOT_INO); | |
2158 | if (IS_ERR(root)) { | |
2159 | err = PTR_ERR(root); | |
2160 | goto out_umount; | |
2161 | } | |
2162 | ||
48fde701 | 2163 | sb->s_root = d_make_root(root); |
7203db97 WY |
2164 | if (!sb->s_root) { |
2165 | err = -ENOMEM; | |
48fde701 | 2166 | goto out_umount; |
7203db97 | 2167 | } |
1e51764a AB |
2168 | |
2169 | mutex_unlock(&c->umount_mutex); | |
1e51764a AB |
2170 | return 0; |
2171 | ||
1e51764a AB |
2172 | out_umount: |
2173 | ubifs_umount(c); | |
2174 | out_unlock: | |
2175 | mutex_unlock(&c->umount_mutex); | |
1e51764a AB |
2176 | out_close: |
2177 | ubi_close_volume(c->ubi); | |
d251ed27 | 2178 | out: |
1e51764a AB |
2179 | return err; |
2180 | } | |
2181 | ||
2182 | static int sb_test(struct super_block *sb, void *data) | |
2183 | { | |
d251ed27 | 2184 | struct ubifs_info *c1 = data; |
7c83f5cb | 2185 | struct ubifs_info *c = sb->s_fs_info; |
1e51764a | 2186 | |
d251ed27 AV |
2187 | return c->vi.cdev == c1->vi.cdev; |
2188 | } | |
2189 | ||
2190 | static int sb_set(struct super_block *sb, void *data) | |
2191 | { | |
2192 | sb->s_fs_info = data; | |
2193 | return set_anon_super(sb, NULL); | |
1e51764a AB |
2194 | } |
2195 | ||
157d81e7 AV |
2196 | static struct dentry *ubifs_mount(struct file_system_type *fs_type, int flags, |
2197 | const char *name, void *data) | |
1e51764a AB |
2198 | { |
2199 | struct ubi_volume_desc *ubi; | |
d251ed27 | 2200 | struct ubifs_info *c; |
1e51764a AB |
2201 | struct super_block *sb; |
2202 | int err; | |
2203 | ||
2204 | dbg_gen("name %s, flags %#x", name, flags); | |
2205 | ||
2206 | /* | |
2207 | * Get UBI device number and volume ID. Mount it read-only so far | |
2208 | * because this might be a new mount point, and UBI allows only one | |
2209 | * read-write user at a time. | |
2210 | */ | |
2211 | ubi = open_ubi(name, UBI_READONLY); | |
2212 | if (IS_ERR(ubi)) { | |
1751e8a6 | 2213 | if (!(flags & SB_SILENT)) |
1ae92642 DG |
2214 | pr_err("UBIFS error (pid: %d): cannot open \"%s\", error %d", |
2215 | current->pid, name, (int)PTR_ERR(ubi)); | |
157d81e7 | 2216 | return ERR_CAST(ubi); |
1e51764a | 2217 | } |
1e51764a | 2218 | |
d251ed27 AV |
2219 | c = alloc_ubifs_info(ubi); |
2220 | if (!c) { | |
2221 | err = -ENOMEM; | |
2222 | goto out_close; | |
2223 | } | |
2224 | ||
2225 | dbg_gen("opened ubi%d_%d", c->vi.ubi_num, c->vi.vol_id); | |
1e51764a | 2226 | |
9249e17f | 2227 | sb = sget(fs_type, sb_test, sb_set, flags, c); |
1e51764a AB |
2228 | if (IS_ERR(sb)) { |
2229 | err = PTR_ERR(sb); | |
d251ed27 | 2230 | kfree(c); |
185bf873 | 2231 | goto out_close; |
1e51764a AB |
2232 | } |
2233 | ||
2234 | if (sb->s_root) { | |
2ef13294 | 2235 | struct ubifs_info *c1 = sb->s_fs_info; |
d251ed27 | 2236 | kfree(c); |
1e51764a AB |
2237 | /* A new mount point for already mounted UBIFS */ |
2238 | dbg_gen("this ubi volume is already mounted"); | |
1751e8a6 | 2239 | if (!!(flags & SB_RDONLY) != c1->ro_mount) { |
1e51764a AB |
2240 | err = -EBUSY; |
2241 | goto out_deact; | |
2242 | } | |
2243 | } else { | |
1751e8a6 | 2244 | err = ubifs_fill_super(sb, data, flags & SB_SILENT ? 1 : 0); |
1e51764a AB |
2245 | if (err) |
2246 | goto out_deact; | |
2247 | /* We do not support atime */ | |
1751e8a6 | 2248 | sb->s_flags |= SB_ACTIVE; |
e3d73dea SH |
2249 | if (IS_ENABLED(CONFIG_UBIFS_ATIME_SUPPORT)) |
2250 | ubifs_msg(c, "full atime support is enabled."); | |
2251 | else | |
2252 | sb->s_flags |= SB_NOATIME; | |
1e51764a AB |
2253 | } |
2254 | ||
2255 | /* 'fill_super()' opens ubi again so we must close it here */ | |
2256 | ubi_close_volume(ubi); | |
2257 | ||
157d81e7 | 2258 | return dget(sb->s_root); |
1e51764a AB |
2259 | |
2260 | out_deact: | |
6f5bbff9 | 2261 | deactivate_locked_super(sb); |
1e51764a AB |
2262 | out_close: |
2263 | ubi_close_volume(ubi); | |
157d81e7 | 2264 | return ERR_PTR(err); |
1e51764a AB |
2265 | } |
2266 | ||
d251ed27 AV |
2267 | static void kill_ubifs_super(struct super_block *s) |
2268 | { | |
2269 | struct ubifs_info *c = s->s_fs_info; | |
2270 | kill_anon_super(s); | |
2271 | kfree(c); | |
2272 | } | |
2273 | ||
1e51764a AB |
2274 | static struct file_system_type ubifs_fs_type = { |
2275 | .name = "ubifs", | |
2276 | .owner = THIS_MODULE, | |
157d81e7 | 2277 | .mount = ubifs_mount, |
d251ed27 | 2278 | .kill_sb = kill_ubifs_super, |
1e51764a | 2279 | }; |
7f78e035 | 2280 | MODULE_ALIAS_FS("ubifs"); |
1e51764a AB |
2281 | |
2282 | /* | |
2283 | * Inode slab cache constructor. | |
2284 | */ | |
51cc5068 | 2285 | static void inode_slab_ctor(void *obj) |
1e51764a AB |
2286 | { |
2287 | struct ubifs_inode *ui = obj; | |
2288 | inode_init_once(&ui->vfs_inode); | |
2289 | } | |
2290 | ||
2291 | static int __init ubifs_init(void) | |
2292 | { | |
2293 | int err; | |
2294 | ||
2295 | BUILD_BUG_ON(sizeof(struct ubifs_ch) != 24); | |
2296 | ||
2297 | /* Make sure node sizes are 8-byte aligned */ | |
2298 | BUILD_BUG_ON(UBIFS_CH_SZ & 7); | |
2299 | BUILD_BUG_ON(UBIFS_INO_NODE_SZ & 7); | |
2300 | BUILD_BUG_ON(UBIFS_DENT_NODE_SZ & 7); | |
2301 | BUILD_BUG_ON(UBIFS_XENT_NODE_SZ & 7); | |
2302 | BUILD_BUG_ON(UBIFS_DATA_NODE_SZ & 7); | |
2303 | BUILD_BUG_ON(UBIFS_TRUN_NODE_SZ & 7); | |
2304 | BUILD_BUG_ON(UBIFS_SB_NODE_SZ & 7); | |
2305 | BUILD_BUG_ON(UBIFS_MST_NODE_SZ & 7); | |
2306 | BUILD_BUG_ON(UBIFS_REF_NODE_SZ & 7); | |
2307 | BUILD_BUG_ON(UBIFS_CS_NODE_SZ & 7); | |
2308 | BUILD_BUG_ON(UBIFS_ORPH_NODE_SZ & 7); | |
2309 | ||
2310 | BUILD_BUG_ON(UBIFS_MAX_DENT_NODE_SZ & 7); | |
2311 | BUILD_BUG_ON(UBIFS_MAX_XENT_NODE_SZ & 7); | |
2312 | BUILD_BUG_ON(UBIFS_MAX_DATA_NODE_SZ & 7); | |
2313 | BUILD_BUG_ON(UBIFS_MAX_INO_NODE_SZ & 7); | |
2314 | BUILD_BUG_ON(UBIFS_MAX_NODE_SZ & 7); | |
2315 | BUILD_BUG_ON(MIN_WRITE_SZ & 7); | |
2316 | ||
2317 | /* Check min. node size */ | |
2318 | BUILD_BUG_ON(UBIFS_INO_NODE_SZ < MIN_WRITE_SZ); | |
2319 | BUILD_BUG_ON(UBIFS_DENT_NODE_SZ < MIN_WRITE_SZ); | |
2320 | BUILD_BUG_ON(UBIFS_XENT_NODE_SZ < MIN_WRITE_SZ); | |
2321 | BUILD_BUG_ON(UBIFS_TRUN_NODE_SZ < MIN_WRITE_SZ); | |
2322 | ||
2323 | BUILD_BUG_ON(UBIFS_MAX_DENT_NODE_SZ > UBIFS_MAX_NODE_SZ); | |
2324 | BUILD_BUG_ON(UBIFS_MAX_XENT_NODE_SZ > UBIFS_MAX_NODE_SZ); | |
2325 | BUILD_BUG_ON(UBIFS_MAX_DATA_NODE_SZ > UBIFS_MAX_NODE_SZ); | |
2326 | BUILD_BUG_ON(UBIFS_MAX_INO_NODE_SZ > UBIFS_MAX_NODE_SZ); | |
2327 | ||
2328 | /* Defined node sizes */ | |
2329 | BUILD_BUG_ON(UBIFS_SB_NODE_SZ != 4096); | |
2330 | BUILD_BUG_ON(UBIFS_MST_NODE_SZ != 512); | |
2331 | BUILD_BUG_ON(UBIFS_INO_NODE_SZ != 160); | |
2332 | BUILD_BUG_ON(UBIFS_REF_NODE_SZ != 64); | |
2333 | ||
a1dc080c AB |
2334 | /* |
2335 | * We use 2 bit wide bit-fields to store compression type, which should | |
2336 | * be amended if more compressors are added. The bit-fields are: | |
553dea4d AB |
2337 | * @compr_type in 'struct ubifs_inode', @default_compr in |
2338 | * 'struct ubifs_info' and @compr_type in 'struct ubifs_mount_opts'. | |
a1dc080c AB |
2339 | */ |
2340 | BUILD_BUG_ON(UBIFS_COMPR_TYPES_CNT > 4); | |
2341 | ||
1e51764a | 2342 | /* |
ea1754a0 | 2343 | * We require that PAGE_SIZE is greater-than-or-equal-to |
1e51764a AB |
2344 | * UBIFS_BLOCK_SIZE. It is assumed that both are powers of 2. |
2345 | */ | |
09cbfeaf | 2346 | if (PAGE_SIZE < UBIFS_BLOCK_SIZE) { |
235c362b | 2347 | pr_err("UBIFS error (pid %d): VFS page cache size is %u bytes, but UBIFS requires at least 4096 bytes", |
09cbfeaf | 2348 | current->pid, (unsigned int)PAGE_SIZE); |
1e51764a AB |
2349 | return -EINVAL; |
2350 | } | |
2351 | ||
1e51764a AB |
2352 | ubifs_inode_slab = kmem_cache_create("ubifs_inode_slab", |
2353 | sizeof(struct ubifs_inode), 0, | |
5d097056 VD |
2354 | SLAB_MEM_SPREAD | SLAB_RECLAIM_ACCOUNT | |
2355 | SLAB_ACCOUNT, &inode_slab_ctor); | |
1e51764a | 2356 | if (!ubifs_inode_slab) |
5cc361e3 | 2357 | return -ENOMEM; |
1e51764a | 2358 | |
a1fe33af CY |
2359 | err = register_shrinker(&ubifs_shrinker_info); |
2360 | if (err) | |
2361 | goto out_slab; | |
1e51764a AB |
2362 | |
2363 | err = ubifs_compressors_init(); | |
552ff317 AB |
2364 | if (err) |
2365 | goto out_shrinker; | |
2366 | ||
2367 | err = dbg_debugfs_init(); | |
1e51764a AB |
2368 | if (err) |
2369 | goto out_compr; | |
2370 | ||
5cc361e3 AV |
2371 | err = register_filesystem(&ubifs_fs_type); |
2372 | if (err) { | |
235c362b SY |
2373 | pr_err("UBIFS error (pid %d): cannot register file system, error %d", |
2374 | current->pid, err); | |
5cc361e3 AV |
2375 | goto out_dbg; |
2376 | } | |
1e51764a AB |
2377 | return 0; |
2378 | ||
5cc361e3 AV |
2379 | out_dbg: |
2380 | dbg_debugfs_exit(); | |
1e51764a | 2381 | out_compr: |
552ff317 AB |
2382 | ubifs_compressors_exit(); |
2383 | out_shrinker: | |
1e51764a | 2384 | unregister_shrinker(&ubifs_shrinker_info); |
a1fe33af | 2385 | out_slab: |
1e51764a | 2386 | kmem_cache_destroy(ubifs_inode_slab); |
1e51764a AB |
2387 | return err; |
2388 | } | |
2389 | /* late_initcall to let compressors initialize first */ | |
2390 | late_initcall(ubifs_init); | |
2391 | ||
2392 | static void __exit ubifs_exit(void) | |
2393 | { | |
f8ccb14f RW |
2394 | WARN_ON(!list_empty(&ubifs_infos)); |
2395 | WARN_ON(atomic_long_read(&ubifs_clean_zn_cnt) != 0); | |
1e51764a | 2396 | |
552ff317 | 2397 | dbg_debugfs_exit(); |
1e51764a AB |
2398 | ubifs_compressors_exit(); |
2399 | unregister_shrinker(&ubifs_shrinker_info); | |
8c0a8537 KS |
2400 | |
2401 | /* | |
2402 | * Make sure all delayed rcu free inodes are flushed before we | |
2403 | * destroy cache. | |
2404 | */ | |
2405 | rcu_barrier(); | |
1e51764a AB |
2406 | kmem_cache_destroy(ubifs_inode_slab); |
2407 | unregister_filesystem(&ubifs_fs_type); | |
2408 | } | |
2409 | module_exit(ubifs_exit); | |
2410 | ||
2411 | MODULE_LICENSE("GPL"); | |
2412 | MODULE_VERSION(__stringify(UBIFS_VERSION)); | |
2413 | MODULE_AUTHOR("Artem Bityutskiy, Adrian Hunter"); | |
2414 | MODULE_DESCRIPTION("UBIFS - UBI File System"); |