Commit | Line | Data |
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1e51764a AB |
1 | /* |
2 | * This file is part of UBIFS. | |
3 | * | |
4 | * Copyright (C) 2006-2008 Nokia Corporation. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License version 2 as published by | |
8 | * the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
13 | * more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License along with | |
16 | * this program; if not, write to the Free Software Foundation, Inc., 51 | |
17 | * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
18 | * | |
19 | * Authors: Artem Bityutskiy (Битюцкий Артём) | |
20 | * Adrian Hunter | |
21 | */ | |
22 | ||
23 | /* | |
24 | * This file implements UBIFS initialization and VFS superblock operations. Some | |
25 | * initialization stuff which is rather large and complex is placed at | |
26 | * corresponding subsystems, but most of it is here. | |
27 | */ | |
28 | ||
29 | #include <linux/init.h> | |
30 | #include <linux/slab.h> | |
31 | #include <linux/module.h> | |
32 | #include <linux/ctype.h> | |
1e51764a AB |
33 | #include <linux/kthread.h> |
34 | #include <linux/parser.h> | |
35 | #include <linux/seq_file.h> | |
36 | #include <linux/mount.h> | |
4d61db4f | 37 | #include <linux/math64.h> |
304d427c | 38 | #include <linux/writeback.h> |
1e51764a AB |
39 | #include "ubifs.h" |
40 | ||
39ce81ce AB |
41 | /* |
42 | * Maximum amount of memory we may 'kmalloc()' without worrying that we are | |
43 | * allocating too much. | |
44 | */ | |
45 | #define UBIFS_KMALLOC_OK (128*1024) | |
46 | ||
1e51764a | 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 DY |
131 | inode->i_flags |= S_NOCMTIME; |
132 | #ifndef CONFIG_UBIFS_ATIME_SUPPORT | |
133 | inode->i_flags |= S_NOATIME; | |
134 | #endif | |
bfe86848 | 135 | set_nlink(inode, le32_to_cpu(ino->nlink)); |
39241beb EB |
136 | i_uid_write(inode, le32_to_cpu(ino->uid)); |
137 | i_gid_write(inode, le32_to_cpu(ino->gid)); | |
1e51764a AB |
138 | inode->i_atime.tv_sec = (int64_t)le64_to_cpu(ino->atime_sec); |
139 | inode->i_atime.tv_nsec = le32_to_cpu(ino->atime_nsec); | |
140 | inode->i_mtime.tv_sec = (int64_t)le64_to_cpu(ino->mtime_sec); | |
141 | inode->i_mtime.tv_nsec = le32_to_cpu(ino->mtime_nsec); | |
142 | inode->i_ctime.tv_sec = (int64_t)le64_to_cpu(ino->ctime_sec); | |
143 | inode->i_ctime.tv_nsec = le32_to_cpu(ino->ctime_nsec); | |
144 | inode->i_mode = le32_to_cpu(ino->mode); | |
145 | inode->i_size = le64_to_cpu(ino->size); | |
146 | ||
147 | ui->data_len = le32_to_cpu(ino->data_len); | |
148 | ui->flags = le32_to_cpu(ino->flags); | |
149 | ui->compr_type = le16_to_cpu(ino->compr_type); | |
150 | ui->creat_sqnum = le64_to_cpu(ino->creat_sqnum); | |
151 | ui->xattr_cnt = le32_to_cpu(ino->xattr_cnt); | |
152 | ui->xattr_size = le32_to_cpu(ino->xattr_size); | |
153 | ui->xattr_names = le32_to_cpu(ino->xattr_names); | |
154 | ui->synced_i_size = ui->ui_size = inode->i_size; | |
155 | ||
156 | ui->xattr = (ui->flags & UBIFS_XATTR_FL) ? 1 : 0; | |
157 | ||
158 | err = validate_inode(c, inode); | |
159 | if (err) | |
160 | goto out_invalid; | |
161 | ||
1e51764a AB |
162 | switch (inode->i_mode & S_IFMT) { |
163 | case S_IFREG: | |
164 | inode->i_mapping->a_ops = &ubifs_file_address_operations; | |
165 | inode->i_op = &ubifs_file_inode_operations; | |
166 | inode->i_fop = &ubifs_file_operations; | |
167 | if (ui->xattr) { | |
168 | ui->data = kmalloc(ui->data_len + 1, GFP_NOFS); | |
169 | if (!ui->data) { | |
170 | err = -ENOMEM; | |
171 | goto out_ino; | |
172 | } | |
173 | memcpy(ui->data, ino->data, ui->data_len); | |
174 | ((char *)ui->data)[ui->data_len] = '\0'; | |
175 | } else if (ui->data_len != 0) { | |
176 | err = 10; | |
177 | goto out_invalid; | |
178 | } | |
179 | break; | |
180 | case S_IFDIR: | |
181 | inode->i_op = &ubifs_dir_inode_operations; | |
182 | inode->i_fop = &ubifs_dir_operations; | |
183 | if (ui->data_len != 0) { | |
184 | err = 11; | |
185 | goto out_invalid; | |
186 | } | |
187 | break; | |
188 | case S_IFLNK: | |
189 | inode->i_op = &ubifs_symlink_inode_operations; | |
190 | if (ui->data_len <= 0 || ui->data_len > UBIFS_MAX_INO_DATA) { | |
191 | err = 12; | |
192 | goto out_invalid; | |
193 | } | |
194 | ui->data = kmalloc(ui->data_len + 1, GFP_NOFS); | |
195 | if (!ui->data) { | |
196 | err = -ENOMEM; | |
197 | goto out_ino; | |
198 | } | |
199 | memcpy(ui->data, ino->data, ui->data_len); | |
200 | ((char *)ui->data)[ui->data_len] = '\0'; | |
201 | break; | |
202 | case S_IFBLK: | |
203 | case S_IFCHR: | |
204 | { | |
205 | dev_t rdev; | |
206 | union ubifs_dev_desc *dev; | |
207 | ||
208 | ui->data = kmalloc(sizeof(union ubifs_dev_desc), GFP_NOFS); | |
209 | if (!ui->data) { | |
210 | err = -ENOMEM; | |
211 | goto out_ino; | |
212 | } | |
213 | ||
214 | dev = (union ubifs_dev_desc *)ino->data; | |
215 | if (ui->data_len == sizeof(dev->new)) | |
216 | rdev = new_decode_dev(le32_to_cpu(dev->new)); | |
217 | else if (ui->data_len == sizeof(dev->huge)) | |
218 | rdev = huge_decode_dev(le64_to_cpu(dev->huge)); | |
219 | else { | |
220 | err = 13; | |
221 | goto out_invalid; | |
222 | } | |
223 | memcpy(ui->data, ino->data, ui->data_len); | |
224 | inode->i_op = &ubifs_file_inode_operations; | |
225 | init_special_inode(inode, inode->i_mode, rdev); | |
226 | break; | |
227 | } | |
228 | case S_IFSOCK: | |
229 | case S_IFIFO: | |
230 | inode->i_op = &ubifs_file_inode_operations; | |
231 | init_special_inode(inode, inode->i_mode, 0); | |
232 | if (ui->data_len != 0) { | |
233 | err = 14; | |
234 | goto out_invalid; | |
235 | } | |
236 | break; | |
237 | default: | |
238 | err = 15; | |
239 | goto out_invalid; | |
240 | } | |
241 | ||
242 | kfree(ino); | |
243 | ubifs_set_inode_flags(inode); | |
244 | unlock_new_inode(inode); | |
245 | return inode; | |
246 | ||
247 | out_invalid: | |
235c362b | 248 | ubifs_err(c, "inode %lu validation failed, error %d", inode->i_ino, err); |
edf6be24 AB |
249 | ubifs_dump_node(c, ino); |
250 | ubifs_dump_inode(c, inode); | |
1e51764a AB |
251 | err = -EINVAL; |
252 | out_ino: | |
253 | kfree(ino); | |
254 | out: | |
235c362b | 255 | ubifs_err(c, "failed to read inode %lu, error %d", inode->i_ino, err); |
1e51764a AB |
256 | iget_failed(inode); |
257 | return ERR_PTR(err); | |
258 | } | |
259 | ||
260 | static struct inode *ubifs_alloc_inode(struct super_block *sb) | |
261 | { | |
262 | struct ubifs_inode *ui; | |
263 | ||
264 | ui = kmem_cache_alloc(ubifs_inode_slab, GFP_NOFS); | |
265 | if (!ui) | |
266 | return NULL; | |
267 | ||
268 | memset((void *)ui + sizeof(struct inode), 0, | |
269 | sizeof(struct ubifs_inode) - sizeof(struct inode)); | |
270 | mutex_init(&ui->ui_mutex); | |
271 | spin_lock_init(&ui->ui_lock); | |
272 | return &ui->vfs_inode; | |
273 | }; | |
274 | ||
fa0d7e3d NP |
275 | static void ubifs_i_callback(struct rcu_head *head) |
276 | { | |
277 | struct inode *inode = container_of(head, struct inode, i_rcu); | |
278 | struct ubifs_inode *ui = ubifs_inode(inode); | |
fa0d7e3d NP |
279 | kmem_cache_free(ubifs_inode_slab, ui); |
280 | } | |
281 | ||
1e51764a AB |
282 | static void ubifs_destroy_inode(struct inode *inode) |
283 | { | |
284 | struct ubifs_inode *ui = ubifs_inode(inode); | |
285 | ||
286 | kfree(ui->data); | |
fa0d7e3d | 287 | call_rcu(&inode->i_rcu, ubifs_i_callback); |
1e51764a AB |
288 | } |
289 | ||
290 | /* | |
291 | * Note, Linux write-back code calls this without 'i_mutex'. | |
292 | */ | |
a9185b41 | 293 | static int ubifs_write_inode(struct inode *inode, struct writeback_control *wbc) |
1e51764a | 294 | { |
fbfa6c88 | 295 | int err = 0; |
1e51764a AB |
296 | struct ubifs_info *c = inode->i_sb->s_fs_info; |
297 | struct ubifs_inode *ui = ubifs_inode(inode); | |
298 | ||
6eb61d58 | 299 | ubifs_assert(c, !ui->xattr); |
1e51764a AB |
300 | if (is_bad_inode(inode)) |
301 | return 0; | |
302 | ||
303 | mutex_lock(&ui->ui_mutex); | |
304 | /* | |
305 | * Due to races between write-back forced by budgeting | |
5c57f20b | 306 | * (see 'sync_some_inodes()') and background write-back, the inode may |
1e51764a AB |
307 | * have already been synchronized, do not do this again. This might |
308 | * also happen if it was synchronized in an VFS operation, e.g. | |
309 | * 'ubifs_link()'. | |
310 | */ | |
311 | if (!ui->dirty) { | |
312 | mutex_unlock(&ui->ui_mutex); | |
313 | return 0; | |
314 | } | |
315 | ||
fbfa6c88 AB |
316 | /* |
317 | * As an optimization, do not write orphan inodes to the media just | |
318 | * because this is not needed. | |
319 | */ | |
320 | dbg_gen("inode %lu, mode %#x, nlink %u", | |
321 | inode->i_ino, (int)inode->i_mode, inode->i_nlink); | |
322 | if (inode->i_nlink) { | |
1f28681a | 323 | err = ubifs_jnl_write_inode(c, inode); |
fbfa6c88 | 324 | if (err) |
235c362b | 325 | ubifs_err(c, "can't write inode %lu, error %d", |
fbfa6c88 | 326 | inode->i_ino, err); |
e3c3efc2 AB |
327 | else |
328 | err = dbg_check_inode_size(c, inode, ui->ui_size); | |
fbfa6c88 | 329 | } |
1e51764a AB |
330 | |
331 | ui->dirty = 0; | |
332 | mutex_unlock(&ui->ui_mutex); | |
333 | ubifs_release_dirty_inode_budget(c, ui); | |
334 | return err; | |
335 | } | |
336 | ||
d640e1b5 | 337 | static void ubifs_evict_inode(struct inode *inode) |
1e51764a AB |
338 | { |
339 | int err; | |
340 | struct ubifs_info *c = inode->i_sb->s_fs_info; | |
1e0f358e | 341 | struct ubifs_inode *ui = ubifs_inode(inode); |
1e51764a | 342 | |
1e0f358e | 343 | if (ui->xattr) |
1e51764a AB |
344 | /* |
345 | * Extended attribute inode deletions are fully handled in | |
346 | * 'ubifs_removexattr()'. These inodes are special and have | |
347 | * limited usage, so there is nothing to do here. | |
348 | */ | |
349 | goto out; | |
350 | ||
7d32c2bb | 351 | dbg_gen("inode %lu, mode %#x", inode->i_ino, (int)inode->i_mode); |
6eb61d58 | 352 | ubifs_assert(c, !atomic_read(&inode->i_count)); |
1e51764a | 353 | |
91b0abe3 | 354 | truncate_inode_pages_final(&inode->i_data); |
d640e1b5 AV |
355 | |
356 | if (inode->i_nlink) | |
357 | goto done; | |
358 | ||
1e51764a AB |
359 | if (is_bad_inode(inode)) |
360 | goto out; | |
361 | ||
1e0f358e | 362 | ui->ui_size = inode->i_size = 0; |
de94eb55 | 363 | err = ubifs_jnl_delete_inode(c, inode); |
1e51764a AB |
364 | if (err) |
365 | /* | |
366 | * Worst case we have a lost orphan inode wasting space, so a | |
0a883a05 | 367 | * simple error message is OK here. |
1e51764a | 368 | */ |
235c362b | 369 | ubifs_err(c, "can't delete inode %lu, error %d", |
de94eb55 AB |
370 | inode->i_ino, err); |
371 | ||
1e51764a | 372 | out: |
1e0f358e AB |
373 | if (ui->dirty) |
374 | ubifs_release_dirty_inode_budget(c, ui); | |
6d6cb0d6 AH |
375 | else { |
376 | /* We've deleted something - clean the "no space" flags */ | |
b137545c | 377 | c->bi.nospace = c->bi.nospace_rp = 0; |
6d6cb0d6 AH |
378 | smp_wmb(); |
379 | } | |
d640e1b5 | 380 | done: |
dbd5768f | 381 | clear_inode(inode); |
3d204e24 | 382 | fscrypt_put_encryption_info(inode); |
1e51764a AB |
383 | } |
384 | ||
aa385729 | 385 | static void ubifs_dirty_inode(struct inode *inode, int flags) |
1e51764a | 386 | { |
6eb61d58 | 387 | struct ubifs_info *c = inode->i_sb->s_fs_info; |
1e51764a AB |
388 | struct ubifs_inode *ui = ubifs_inode(inode); |
389 | ||
6eb61d58 | 390 | ubifs_assert(c, mutex_is_locked(&ui->ui_mutex)); |
1e51764a AB |
391 | if (!ui->dirty) { |
392 | ui->dirty = 1; | |
393 | dbg_gen("inode %lu", inode->i_ino); | |
394 | } | |
395 | } | |
396 | ||
397 | static int ubifs_statfs(struct dentry *dentry, struct kstatfs *buf) | |
398 | { | |
399 | struct ubifs_info *c = dentry->d_sb->s_fs_info; | |
400 | unsigned long long free; | |
7c7cbadf | 401 | __le32 *uuid = (__le32 *)c->uuid; |
1e51764a | 402 | |
7dad181b | 403 | free = ubifs_get_free_space(c); |
1e51764a AB |
404 | dbg_gen("free space %lld bytes (%lld blocks)", |
405 | free, free >> UBIFS_BLOCK_SHIFT); | |
406 | ||
407 | buf->f_type = UBIFS_SUPER_MAGIC; | |
408 | buf->f_bsize = UBIFS_BLOCK_SIZE; | |
409 | buf->f_blocks = c->block_cnt; | |
410 | buf->f_bfree = free >> UBIFS_BLOCK_SHIFT; | |
411 | if (free > c->report_rp_size) | |
412 | buf->f_bavail = (free - c->report_rp_size) >> UBIFS_BLOCK_SHIFT; | |
413 | else | |
414 | buf->f_bavail = 0; | |
415 | buf->f_files = 0; | |
416 | buf->f_ffree = 0; | |
417 | buf->f_namelen = UBIFS_MAX_NLEN; | |
7c7cbadf AB |
418 | buf->f_fsid.val[0] = le32_to_cpu(uuid[0]) ^ le32_to_cpu(uuid[2]); |
419 | buf->f_fsid.val[1] = le32_to_cpu(uuid[1]) ^ le32_to_cpu(uuid[3]); | |
6eb61d58 | 420 | ubifs_assert(c, buf->f_bfree <= c->block_cnt); |
1e51764a AB |
421 | return 0; |
422 | } | |
423 | ||
34c80b1d | 424 | static int ubifs_show_options(struct seq_file *s, struct dentry *root) |
1e51764a | 425 | { |
34c80b1d | 426 | struct ubifs_info *c = root->d_sb->s_fs_info; |
1e51764a AB |
427 | |
428 | if (c->mount_opts.unmount_mode == 2) | |
d4eb08ff | 429 | seq_puts(s, ",fast_unmount"); |
1e51764a | 430 | else if (c->mount_opts.unmount_mode == 1) |
d4eb08ff | 431 | seq_puts(s, ",norm_unmount"); |
1e51764a | 432 | |
4793e7c5 | 433 | if (c->mount_opts.bulk_read == 2) |
d4eb08ff | 434 | seq_puts(s, ",bulk_read"); |
4793e7c5 | 435 | else if (c->mount_opts.bulk_read == 1) |
d4eb08ff | 436 | seq_puts(s, ",no_bulk_read"); |
4793e7c5 | 437 | |
2953e73f | 438 | if (c->mount_opts.chk_data_crc == 2) |
d4eb08ff | 439 | seq_puts(s, ",chk_data_crc"); |
2953e73f | 440 | else if (c->mount_opts.chk_data_crc == 1) |
d4eb08ff | 441 | seq_puts(s, ",no_chk_data_crc"); |
2953e73f | 442 | |
553dea4d | 443 | if (c->mount_opts.override_compr) { |
fcabb347 | 444 | seq_printf(s, ",compr=%s", |
6eb61d58 | 445 | ubifs_compr_name(c, c->mount_opts.compr_type)); |
553dea4d AB |
446 | } |
447 | ||
c38c5a7f | 448 | seq_printf(s, ",assert=%s", ubifs_assert_action_name(c)); |
319c1042 RV |
449 | seq_printf(s, ",ubi=%d,vol=%d", c->vi.ubi_num, c->vi.vol_id); |
450 | ||
1e51764a AB |
451 | return 0; |
452 | } | |
453 | ||
454 | static int ubifs_sync_fs(struct super_block *sb, int wait) | |
455 | { | |
f1038300 | 456 | int i, err; |
1e51764a | 457 | struct ubifs_info *c = sb->s_fs_info; |
304d427c | 458 | |
e8ea1759 | 459 | /* |
dedb0d48 AB |
460 | * Zero @wait is just an advisory thing to help the file system shove |
461 | * lots of data into the queues, and there will be the second | |
e8ea1759 AB |
462 | * '->sync_fs()' call, with non-zero @wait. |
463 | */ | |
dedb0d48 AB |
464 | if (!wait) |
465 | return 0; | |
e8ea1759 | 466 | |
3eb14297 AH |
467 | /* |
468 | * Synchronize write buffers, because 'ubifs_run_commit()' does not | |
469 | * do this if it waits for an already running commit. | |
470 | */ | |
471 | for (i = 0; i < c->jhead_cnt; i++) { | |
472 | err = ubifs_wbuf_sync(&c->jheads[i].wbuf); | |
473 | if (err) | |
474 | return err; | |
475 | } | |
476 | ||
887ee171 AB |
477 | /* |
478 | * Strictly speaking, it is not necessary to commit the journal here, | |
479 | * synchronizing write-buffers would be enough. But committing makes | |
480 | * UBIFS free space predictions much more accurate, so we want to let | |
481 | * the user be able to get more accurate results of 'statfs()' after | |
482 | * they synchronize the file system. | |
483 | */ | |
f1038300 AB |
484 | err = ubifs_run_commit(c); |
485 | if (err) | |
486 | return err; | |
403e12ab | 487 | |
cb5c6a2b | 488 | return ubi_sync(c->vi.ubi_num); |
1e51764a AB |
489 | } |
490 | ||
491 | /** | |
492 | * init_constants_early - initialize UBIFS constants. | |
493 | * @c: UBIFS file-system description object | |
494 | * | |
495 | * This function initialize UBIFS constants which do not need the superblock to | |
496 | * be read. It also checks that the UBI volume satisfies basic UBIFS | |
497 | * requirements. Returns zero in case of success and a negative error code in | |
498 | * case of failure. | |
499 | */ | |
500 | static int init_constants_early(struct ubifs_info *c) | |
501 | { | |
502 | if (c->vi.corrupted) { | |
235c362b | 503 | ubifs_warn(c, "UBI volume is corrupted - read-only mode"); |
1e51764a AB |
504 | c->ro_media = 1; |
505 | } | |
506 | ||
507 | if (c->di.ro_mode) { | |
235c362b | 508 | ubifs_msg(c, "read-only UBI device"); |
1e51764a AB |
509 | c->ro_media = 1; |
510 | } | |
511 | ||
512 | if (c->vi.vol_type == UBI_STATIC_VOLUME) { | |
235c362b | 513 | ubifs_msg(c, "static UBI volume - read-only mode"); |
1e51764a AB |
514 | c->ro_media = 1; |
515 | } | |
516 | ||
517 | c->leb_cnt = c->vi.size; | |
518 | c->leb_size = c->vi.usable_leb_size; | |
ca2ec61d | 519 | c->leb_start = c->di.leb_start; |
1e51764a AB |
520 | c->half_leb_size = c->leb_size / 2; |
521 | c->min_io_size = c->di.min_io_size; | |
522 | c->min_io_shift = fls(c->min_io_size) - 1; | |
3e8e2e0c AB |
523 | c->max_write_size = c->di.max_write_size; |
524 | c->max_write_shift = fls(c->max_write_size) - 1; | |
1e51764a AB |
525 | |
526 | if (c->leb_size < UBIFS_MIN_LEB_SZ) { | |
dccbc919 DG |
527 | ubifs_errc(c, "too small LEBs (%d bytes), min. is %d bytes", |
528 | c->leb_size, UBIFS_MIN_LEB_SZ); | |
1e51764a AB |
529 | return -EINVAL; |
530 | } | |
531 | ||
532 | if (c->leb_cnt < UBIFS_MIN_LEB_CNT) { | |
dccbc919 DG |
533 | ubifs_errc(c, "too few LEBs (%d), min. is %d", |
534 | c->leb_cnt, UBIFS_MIN_LEB_CNT); | |
1e51764a AB |
535 | return -EINVAL; |
536 | } | |
537 | ||
538 | if (!is_power_of_2(c->min_io_size)) { | |
dccbc919 | 539 | ubifs_errc(c, "bad min. I/O size %d", c->min_io_size); |
1e51764a AB |
540 | return -EINVAL; |
541 | } | |
542 | ||
3e8e2e0c AB |
543 | /* |
544 | * Maximum write size has to be greater or equivalent to min. I/O | |
545 | * size, and be multiple of min. I/O size. | |
546 | */ | |
547 | if (c->max_write_size < c->min_io_size || | |
548 | c->max_write_size % c->min_io_size || | |
549 | !is_power_of_2(c->max_write_size)) { | |
dccbc919 DG |
550 | ubifs_errc(c, "bad write buffer size %d for %d min. I/O unit", |
551 | c->max_write_size, c->min_io_size); | |
3e8e2e0c AB |
552 | return -EINVAL; |
553 | } | |
554 | ||
1e51764a AB |
555 | /* |
556 | * UBIFS aligns all node to 8-byte boundary, so to make function in | |
557 | * io.c simpler, assume minimum I/O unit size to be 8 bytes if it is | |
558 | * less than 8. | |
559 | */ | |
560 | if (c->min_io_size < 8) { | |
561 | c->min_io_size = 8; | |
562 | c->min_io_shift = 3; | |
3e8e2e0c AB |
563 | if (c->max_write_size < c->min_io_size) { |
564 | c->max_write_size = c->min_io_size; | |
565 | c->max_write_shift = c->min_io_shift; | |
566 | } | |
1e51764a AB |
567 | } |
568 | ||
569 | c->ref_node_alsz = ALIGN(UBIFS_REF_NODE_SZ, c->min_io_size); | |
570 | c->mst_node_alsz = ALIGN(UBIFS_MST_NODE_SZ, c->min_io_size); | |
571 | ||
572 | /* | |
573 | * Initialize node length ranges which are mostly needed for node | |
574 | * length validation. | |
575 | */ | |
576 | c->ranges[UBIFS_PAD_NODE].len = UBIFS_PAD_NODE_SZ; | |
577 | c->ranges[UBIFS_SB_NODE].len = UBIFS_SB_NODE_SZ; | |
578 | c->ranges[UBIFS_MST_NODE].len = UBIFS_MST_NODE_SZ; | |
579 | c->ranges[UBIFS_REF_NODE].len = UBIFS_REF_NODE_SZ; | |
580 | c->ranges[UBIFS_TRUN_NODE].len = UBIFS_TRUN_NODE_SZ; | |
581 | c->ranges[UBIFS_CS_NODE].len = UBIFS_CS_NODE_SZ; | |
d8a22773 SH |
582 | c->ranges[UBIFS_AUTH_NODE].min_len = UBIFS_AUTH_NODE_SZ; |
583 | c->ranges[UBIFS_AUTH_NODE].max_len = UBIFS_AUTH_NODE_SZ + | |
584 | UBIFS_MAX_HMAC_LEN; | |
1e51764a AB |
585 | |
586 | c->ranges[UBIFS_INO_NODE].min_len = UBIFS_INO_NODE_SZ; | |
587 | c->ranges[UBIFS_INO_NODE].max_len = UBIFS_MAX_INO_NODE_SZ; | |
588 | c->ranges[UBIFS_ORPH_NODE].min_len = | |
589 | UBIFS_ORPH_NODE_SZ + sizeof(__le64); | |
590 | c->ranges[UBIFS_ORPH_NODE].max_len = c->leb_size; | |
591 | c->ranges[UBIFS_DENT_NODE].min_len = UBIFS_DENT_NODE_SZ; | |
592 | c->ranges[UBIFS_DENT_NODE].max_len = UBIFS_MAX_DENT_NODE_SZ; | |
593 | c->ranges[UBIFS_XENT_NODE].min_len = UBIFS_XENT_NODE_SZ; | |
594 | c->ranges[UBIFS_XENT_NODE].max_len = UBIFS_MAX_XENT_NODE_SZ; | |
595 | c->ranges[UBIFS_DATA_NODE].min_len = UBIFS_DATA_NODE_SZ; | |
596 | c->ranges[UBIFS_DATA_NODE].max_len = UBIFS_MAX_DATA_NODE_SZ; | |
597 | /* | |
598 | * Minimum indexing node size is amended later when superblock is | |
599 | * read and the key length is known. | |
600 | */ | |
601 | c->ranges[UBIFS_IDX_NODE].min_len = UBIFS_IDX_NODE_SZ + UBIFS_BRANCH_SZ; | |
602 | /* | |
603 | * Maximum indexing node size is amended later when superblock is | |
604 | * read and the fanout is known. | |
605 | */ | |
606 | c->ranges[UBIFS_IDX_NODE].max_len = INT_MAX; | |
607 | ||
608 | /* | |
7078202e AB |
609 | * Initialize dead and dark LEB space watermarks. See gc.c for comments |
610 | * about these values. | |
1e51764a AB |
611 | */ |
612 | c->dead_wm = ALIGN(MIN_WRITE_SZ, c->min_io_size); | |
613 | c->dark_wm = ALIGN(UBIFS_MAX_NODE_SZ, c->min_io_size); | |
614 | ||
9bbb5726 AB |
615 | /* |
616 | * Calculate how many bytes would be wasted at the end of LEB if it was | |
617 | * fully filled with data nodes of maximum size. This is used in | |
618 | * calculations when reporting free space. | |
619 | */ | |
620 | c->leb_overhead = c->leb_size % UBIFS_MAX_DATA_NODE_SZ; | |
39ce81ce | 621 | |
4793e7c5 | 622 | /* Buffer size for bulk-reads */ |
6c0c42cd AB |
623 | c->max_bu_buf_len = UBIFS_MAX_BULK_READ * UBIFS_MAX_DATA_NODE_SZ; |
624 | if (c->max_bu_buf_len > c->leb_size) | |
625 | c->max_bu_buf_len = c->leb_size; | |
1e51764a AB |
626 | return 0; |
627 | } | |
628 | ||
629 | /** | |
630 | * bud_wbuf_callback - bud LEB write-buffer synchronization call-back. | |
631 | * @c: UBIFS file-system description object | |
632 | * @lnum: LEB the write-buffer was synchronized to | |
633 | * @free: how many free bytes left in this LEB | |
634 | * @pad: how many bytes were padded | |
635 | * | |
636 | * This is a callback function which is called by the I/O unit when the | |
637 | * write-buffer is synchronized. We need this to correctly maintain space | |
638 | * accounting in bud logical eraseblocks. This function returns zero in case of | |
639 | * success and a negative error code in case of failure. | |
640 | * | |
641 | * This function actually belongs to the journal, but we keep it here because | |
642 | * we want to keep it static. | |
643 | */ | |
644 | static int bud_wbuf_callback(struct ubifs_info *c, int lnum, int free, int pad) | |
645 | { | |
646 | return ubifs_update_one_lp(c, lnum, free, pad, 0, 0); | |
647 | } | |
648 | ||
649 | /* | |
79807d07 | 650 | * init_constants_sb - initialize UBIFS constants. |
1e51764a AB |
651 | * @c: UBIFS file-system description object |
652 | * | |
653 | * This is a helper function which initializes various UBIFS constants after | |
654 | * the superblock has been read. It also checks various UBIFS parameters and | |
655 | * makes sure they are all right. Returns zero in case of success and a | |
656 | * negative error code in case of failure. | |
657 | */ | |
79807d07 | 658 | static int init_constants_sb(struct ubifs_info *c) |
1e51764a AB |
659 | { |
660 | int tmp, err; | |
4d61db4f | 661 | long long tmp64; |
1e51764a AB |
662 | |
663 | c->main_bytes = (long long)c->main_lebs * c->leb_size; | |
664 | c->max_znode_sz = sizeof(struct ubifs_znode) + | |
665 | c->fanout * sizeof(struct ubifs_zbranch); | |
666 | ||
667 | tmp = ubifs_idx_node_sz(c, 1); | |
668 | c->ranges[UBIFS_IDX_NODE].min_len = tmp; | |
669 | c->min_idx_node_sz = ALIGN(tmp, 8); | |
670 | ||
671 | tmp = ubifs_idx_node_sz(c, c->fanout); | |
672 | c->ranges[UBIFS_IDX_NODE].max_len = tmp; | |
673 | c->max_idx_node_sz = ALIGN(tmp, 8); | |
674 | ||
675 | /* Make sure LEB size is large enough to fit full commit */ | |
676 | tmp = UBIFS_CS_NODE_SZ + UBIFS_REF_NODE_SZ * c->jhead_cnt; | |
677 | tmp = ALIGN(tmp, c->min_io_size); | |
678 | if (tmp > c->leb_size) { | |
235c362b | 679 | ubifs_err(c, "too small LEB size %d, at least %d needed", |
a6aae4dd | 680 | c->leb_size, tmp); |
1e51764a AB |
681 | return -EINVAL; |
682 | } | |
683 | ||
684 | /* | |
685 | * Make sure that the log is large enough to fit reference nodes for | |
686 | * all buds plus one reserved LEB. | |
687 | */ | |
4d61db4f AB |
688 | tmp64 = c->max_bud_bytes + c->leb_size - 1; |
689 | c->max_bud_cnt = div_u64(tmp64, c->leb_size); | |
1e51764a AB |
690 | tmp = (c->ref_node_alsz * c->max_bud_cnt + c->leb_size - 1); |
691 | tmp /= c->leb_size; | |
692 | tmp += 1; | |
693 | if (c->log_lebs < tmp) { | |
235c362b | 694 | ubifs_err(c, "too small log %d LEBs, required min. %d LEBs", |
a6aae4dd | 695 | c->log_lebs, tmp); |
1e51764a AB |
696 | return -EINVAL; |
697 | } | |
698 | ||
699 | /* | |
700 | * When budgeting we assume worst-case scenarios when the pages are not | |
701 | * be compressed and direntries are of the maximum size. | |
702 | * | |
703 | * Note, data, which may be stored in inodes is budgeted separately, so | |
b137545c | 704 | * it is not included into 'c->bi.inode_budget'. |
1e51764a | 705 | */ |
b137545c AB |
706 | c->bi.page_budget = UBIFS_MAX_DATA_NODE_SZ * UBIFS_BLOCKS_PER_PAGE; |
707 | c->bi.inode_budget = UBIFS_INO_NODE_SZ; | |
708 | c->bi.dent_budget = UBIFS_MAX_DENT_NODE_SZ; | |
1e51764a AB |
709 | |
710 | /* | |
711 | * When the amount of flash space used by buds becomes | |
712 | * 'c->max_bud_bytes', UBIFS just blocks all writers and starts commit. | |
713 | * The writers are unblocked when the commit is finished. To avoid | |
714 | * writers to be blocked UBIFS initiates background commit in advance, | |
715 | * when number of bud bytes becomes above the limit defined below. | |
716 | */ | |
717 | c->bg_bud_bytes = (c->max_bud_bytes * 13) >> 4; | |
718 | ||
719 | /* | |
720 | * Ensure minimum journal size. All the bytes in the journal heads are | |
721 | * considered to be used, when calculating the current journal usage. | |
722 | * Consequently, if the journal is too small, UBIFS will treat it as | |
723 | * always full. | |
724 | */ | |
4d61db4f | 725 | tmp64 = (long long)(c->jhead_cnt + 1) * c->leb_size + 1; |
1e51764a AB |
726 | if (c->bg_bud_bytes < tmp64) |
727 | c->bg_bud_bytes = tmp64; | |
728 | if (c->max_bud_bytes < tmp64 + c->leb_size) | |
729 | c->max_bud_bytes = tmp64 + c->leb_size; | |
730 | ||
731 | err = ubifs_calc_lpt_geom(c); | |
732 | if (err) | |
733 | return err; | |
734 | ||
fb1cd01a AB |
735 | /* Initialize effective LEB size used in budgeting calculations */ |
736 | c->idx_leb_size = c->leb_size - c->max_idx_node_sz; | |
79807d07 AB |
737 | return 0; |
738 | } | |
739 | ||
740 | /* | |
741 | * init_constants_master - initialize UBIFS constants. | |
742 | * @c: UBIFS file-system description object | |
743 | * | |
744 | * This is a helper function which initializes various UBIFS constants after | |
745 | * the master node has been read. It also checks various UBIFS parameters and | |
746 | * makes sure they are all right. | |
747 | */ | |
748 | static void init_constants_master(struct ubifs_info *c) | |
749 | { | |
750 | long long tmp64; | |
751 | ||
b137545c | 752 | c->bi.min_idx_lebs = ubifs_calc_min_idx_lebs(c); |
fb1cd01a | 753 | c->report_rp_size = ubifs_reported_space(c, c->rp_size); |
1e51764a AB |
754 | |
755 | /* | |
756 | * Calculate total amount of FS blocks. This number is not used | |
757 | * internally because it does not make much sense for UBIFS, but it is | |
758 | * necessary to report something for the 'statfs()' call. | |
759 | * | |
7dad181b | 760 | * Subtract the LEB reserved for GC, the LEB which is reserved for |
af14a1ad AB |
761 | * deletions, minimum LEBs for the index, and assume only one journal |
762 | * head is available. | |
1e51764a | 763 | */ |
af14a1ad | 764 | tmp64 = c->main_lebs - 1 - 1 - MIN_INDEX_LEBS - c->jhead_cnt + 1; |
4d61db4f | 765 | tmp64 *= (long long)c->leb_size - c->leb_overhead; |
1e51764a AB |
766 | tmp64 = ubifs_reported_space(c, tmp64); |
767 | c->block_cnt = tmp64 >> UBIFS_BLOCK_SHIFT; | |
1e51764a AB |
768 | } |
769 | ||
770 | /** | |
771 | * take_gc_lnum - reserve GC LEB. | |
772 | * @c: UBIFS file-system description object | |
773 | * | |
b4978e94 AB |
774 | * This function ensures that the LEB reserved for garbage collection is marked |
775 | * as "taken" in lprops. We also have to set free space to LEB size and dirty | |
776 | * space to zero, because lprops may contain out-of-date information if the | |
777 | * file-system was un-mounted before it has been committed. This function | |
778 | * returns zero in case of success and a negative error code in case of | |
779 | * failure. | |
1e51764a AB |
780 | */ |
781 | static int take_gc_lnum(struct ubifs_info *c) | |
782 | { | |
783 | int err; | |
784 | ||
785 | if (c->gc_lnum == -1) { | |
235c362b | 786 | ubifs_err(c, "no LEB for GC"); |
1e51764a AB |
787 | return -EINVAL; |
788 | } | |
789 | ||
1e51764a AB |
790 | /* And we have to tell lprops that this LEB is taken */ |
791 | err = ubifs_change_one_lp(c, c->gc_lnum, c->leb_size, 0, | |
792 | LPROPS_TAKEN, 0, 0); | |
793 | return err; | |
794 | } | |
795 | ||
796 | /** | |
797 | * alloc_wbufs - allocate write-buffers. | |
798 | * @c: UBIFS file-system description object | |
799 | * | |
800 | * This helper function allocates and initializes UBIFS write-buffers. Returns | |
801 | * zero in case of success and %-ENOMEM in case of failure. | |
802 | */ | |
803 | static int alloc_wbufs(struct ubifs_info *c) | |
804 | { | |
805 | int i, err; | |
806 | ||
86b4c14d FF |
807 | c->jheads = kcalloc(c->jhead_cnt, sizeof(struct ubifs_jhead), |
808 | GFP_KERNEL); | |
1e51764a AB |
809 | if (!c->jheads) |
810 | return -ENOMEM; | |
811 | ||
812 | /* Initialize journal heads */ | |
813 | for (i = 0; i < c->jhead_cnt; i++) { | |
814 | INIT_LIST_HEAD(&c->jheads[i].buds_list); | |
815 | err = ubifs_wbuf_init(c, &c->jheads[i].wbuf); | |
816 | if (err) | |
817 | return err; | |
818 | ||
819 | c->jheads[i].wbuf.sync_callback = &bud_wbuf_callback; | |
820 | c->jheads[i].wbuf.jhead = i; | |
1a0b0699 | 821 | c->jheads[i].grouped = 1; |
6a98bc46 SH |
822 | c->jheads[i].log_hash = ubifs_hash_get_desc(c); |
823 | if (IS_ERR(c->jheads[i].log_hash)) | |
824 | goto out; | |
1e51764a AB |
825 | } |
826 | ||
1e51764a | 827 | /* |
44156267 AB |
828 | * Garbage Collector head does not need to be synchronized by timer. |
829 | * Also GC head nodes are not grouped. | |
1e51764a | 830 | */ |
0b335b9d | 831 | c->jheads[GCHD].wbuf.no_timer = 1; |
1a0b0699 | 832 | c->jheads[GCHD].grouped = 0; |
1e51764a AB |
833 | |
834 | return 0; | |
6a98bc46 SH |
835 | |
836 | out: | |
837 | while (i--) | |
838 | kfree(c->jheads[i].log_hash); | |
839 | ||
840 | return err; | |
1e51764a AB |
841 | } |
842 | ||
843 | /** | |
844 | * free_wbufs - free write-buffers. | |
845 | * @c: UBIFS file-system description object | |
846 | */ | |
847 | static void free_wbufs(struct ubifs_info *c) | |
848 | { | |
849 | int i; | |
850 | ||
851 | if (c->jheads) { | |
852 | for (i = 0; i < c->jhead_cnt; i++) { | |
853 | kfree(c->jheads[i].wbuf.buf); | |
854 | kfree(c->jheads[i].wbuf.inodes); | |
6a98bc46 | 855 | kfree(c->jheads[i].log_hash); |
1e51764a AB |
856 | } |
857 | kfree(c->jheads); | |
858 | c->jheads = NULL; | |
859 | } | |
860 | } | |
861 | ||
862 | /** | |
863 | * free_orphans - free orphans. | |
864 | * @c: UBIFS file-system description object | |
865 | */ | |
866 | static void free_orphans(struct ubifs_info *c) | |
867 | { | |
868 | struct ubifs_orphan *orph; | |
869 | ||
870 | while (c->orph_dnext) { | |
871 | orph = c->orph_dnext; | |
872 | c->orph_dnext = orph->dnext; | |
873 | list_del(&orph->list); | |
874 | kfree(orph); | |
875 | } | |
876 | ||
877 | while (!list_empty(&c->orph_list)) { | |
878 | orph = list_entry(c->orph_list.next, struct ubifs_orphan, list); | |
879 | list_del(&orph->list); | |
880 | kfree(orph); | |
235c362b | 881 | ubifs_err(c, "orphan list not empty at unmount"); |
1e51764a AB |
882 | } |
883 | ||
884 | vfree(c->orph_buf); | |
885 | c->orph_buf = NULL; | |
886 | } | |
887 | ||
888 | /** | |
889 | * free_buds - free per-bud objects. | |
890 | * @c: UBIFS file-system description object | |
891 | */ | |
892 | static void free_buds(struct ubifs_info *c) | |
893 | { | |
bb25e49f CS |
894 | struct ubifs_bud *bud, *n; |
895 | ||
896 | rbtree_postorder_for_each_entry_safe(bud, n, &c->buds, rb) | |
897 | kfree(bud); | |
1e51764a AB |
898 | } |
899 | ||
900 | /** | |
901 | * check_volume_empty - check if the UBI volume is empty. | |
902 | * @c: UBIFS file-system description object | |
903 | * | |
904 | * This function checks if the UBIFS volume is empty by looking if its LEBs are | |
905 | * mapped or not. The result of checking is stored in the @c->empty variable. | |
906 | * Returns zero in case of success and a negative error code in case of | |
907 | * failure. | |
908 | */ | |
909 | static int check_volume_empty(struct ubifs_info *c) | |
910 | { | |
911 | int lnum, err; | |
912 | ||
913 | c->empty = 1; | |
914 | for (lnum = 0; lnum < c->leb_cnt; lnum++) { | |
d3b2578f | 915 | err = ubifs_is_mapped(c, lnum); |
1e51764a AB |
916 | if (unlikely(err < 0)) |
917 | return err; | |
918 | if (err == 1) { | |
919 | c->empty = 0; | |
920 | break; | |
921 | } | |
922 | ||
923 | cond_resched(); | |
924 | } | |
925 | ||
926 | return 0; | |
927 | } | |
928 | ||
929 | /* | |
930 | * UBIFS mount options. | |
931 | * | |
932 | * Opt_fast_unmount: do not run a journal commit before un-mounting | |
933 | * Opt_norm_unmount: run a journal commit before un-mounting | |
4793e7c5 AH |
934 | * Opt_bulk_read: enable bulk-reads |
935 | * Opt_no_bulk_read: disable bulk-reads | |
2953e73f AH |
936 | * Opt_chk_data_crc: check CRCs when reading data nodes |
937 | * Opt_no_chk_data_crc: do not check CRCs when reading data nodes | |
553dea4d | 938 | * Opt_override_compr: override default compressor |
c38c5a7f | 939 | * Opt_assert: set ubifs_assert() action |
d8a22773 SH |
940 | * Opt_auth_key: The key name used for authentication |
941 | * Opt_auth_hash_name: The hash type used for authentication | |
1e51764a AB |
942 | * Opt_err: just end of array marker |
943 | */ | |
944 | enum { | |
945 | Opt_fast_unmount, | |
946 | Opt_norm_unmount, | |
4793e7c5 AH |
947 | Opt_bulk_read, |
948 | Opt_no_bulk_read, | |
2953e73f AH |
949 | Opt_chk_data_crc, |
950 | Opt_no_chk_data_crc, | |
553dea4d | 951 | Opt_override_compr, |
c38c5a7f | 952 | Opt_assert, |
d8a22773 SH |
953 | Opt_auth_key, |
954 | Opt_auth_hash_name, | |
319c1042 | 955 | Opt_ignore, |
1e51764a AB |
956 | Opt_err, |
957 | }; | |
958 | ||
a447c093 | 959 | static const match_table_t tokens = { |
1e51764a AB |
960 | {Opt_fast_unmount, "fast_unmount"}, |
961 | {Opt_norm_unmount, "norm_unmount"}, | |
4793e7c5 AH |
962 | {Opt_bulk_read, "bulk_read"}, |
963 | {Opt_no_bulk_read, "no_bulk_read"}, | |
2953e73f AH |
964 | {Opt_chk_data_crc, "chk_data_crc"}, |
965 | {Opt_no_chk_data_crc, "no_chk_data_crc"}, | |
553dea4d | 966 | {Opt_override_compr, "compr=%s"}, |
d8a22773 SH |
967 | {Opt_auth_key, "auth_key=%s"}, |
968 | {Opt_auth_hash_name, "auth_hash_name=%s"}, | |
319c1042 RV |
969 | {Opt_ignore, "ubi=%s"}, |
970 | {Opt_ignore, "vol=%s"}, | |
c38c5a7f | 971 | {Opt_assert, "assert=%s"}, |
1e51764a AB |
972 | {Opt_err, NULL}, |
973 | }; | |
974 | ||
8379ea31 AB |
975 | /** |
976 | * parse_standard_option - parse a standard mount option. | |
977 | * @option: the option to parse | |
978 | * | |
979 | * Normally, standard mount options like "sync" are passed to file-systems as | |
980 | * flags. However, when a "rootflags=" kernel boot parameter is used, they may | |
981 | * be present in the options string. This function tries to deal with this | |
982 | * situation and parse standard options. Returns 0 if the option was not | |
983 | * recognized, and the corresponding integer flag if it was. | |
984 | * | |
985 | * UBIFS is only interested in the "sync" option, so do not check for anything | |
986 | * else. | |
987 | */ | |
988 | static int parse_standard_option(const char *option) | |
989 | { | |
235c362b SY |
990 | |
991 | pr_notice("UBIFS: parse %s\n", option); | |
8379ea31 | 992 | if (!strcmp(option, "sync")) |
1751e8a6 | 993 | return SB_SYNCHRONOUS; |
8379ea31 AB |
994 | return 0; |
995 | } | |
996 | ||
1e51764a AB |
997 | /** |
998 | * ubifs_parse_options - parse mount parameters. | |
999 | * @c: UBIFS file-system description object | |
1000 | * @options: parameters to parse | |
1001 | * @is_remount: non-zero if this is FS re-mount | |
1002 | * | |
1003 | * This function parses UBIFS mount options and returns zero in case success | |
1004 | * and a negative error code in case of failure. | |
1005 | */ | |
1006 | static int ubifs_parse_options(struct ubifs_info *c, char *options, | |
1007 | int is_remount) | |
1008 | { | |
1009 | char *p; | |
1010 | substring_t args[MAX_OPT_ARGS]; | |
1011 | ||
1012 | if (!options) | |
1013 | return 0; | |
1014 | ||
1015 | while ((p = strsep(&options, ","))) { | |
1016 | int token; | |
1017 | ||
1018 | if (!*p) | |
1019 | continue; | |
1020 | ||
1021 | token = match_token(p, tokens, args); | |
1022 | switch (token) { | |
27ad2799 AB |
1023 | /* |
1024 | * %Opt_fast_unmount and %Opt_norm_unmount options are ignored. | |
cb54ef8b | 1025 | * We accept them in order to be backward-compatible. But this |
27ad2799 AB |
1026 | * should be removed at some point. |
1027 | */ | |
1e51764a AB |
1028 | case Opt_fast_unmount: |
1029 | c->mount_opts.unmount_mode = 2; | |
1e51764a AB |
1030 | break; |
1031 | case Opt_norm_unmount: | |
1032 | c->mount_opts.unmount_mode = 1; | |
1e51764a | 1033 | break; |
4793e7c5 AH |
1034 | case Opt_bulk_read: |
1035 | c->mount_opts.bulk_read = 2; | |
1036 | c->bulk_read = 1; | |
1037 | break; | |
1038 | case Opt_no_bulk_read: | |
1039 | c->mount_opts.bulk_read = 1; | |
1040 | c->bulk_read = 0; | |
1041 | break; | |
2953e73f AH |
1042 | case Opt_chk_data_crc: |
1043 | c->mount_opts.chk_data_crc = 2; | |
1044 | c->no_chk_data_crc = 0; | |
1045 | break; | |
1046 | case Opt_no_chk_data_crc: | |
1047 | c->mount_opts.chk_data_crc = 1; | |
1048 | c->no_chk_data_crc = 1; | |
1049 | break; | |
553dea4d AB |
1050 | case Opt_override_compr: |
1051 | { | |
1052 | char *name = match_strdup(&args[0]); | |
1053 | ||
1054 | if (!name) | |
1055 | return -ENOMEM; | |
1056 | if (!strcmp(name, "none")) | |
1057 | c->mount_opts.compr_type = UBIFS_COMPR_NONE; | |
1058 | else if (!strcmp(name, "lzo")) | |
1059 | c->mount_opts.compr_type = UBIFS_COMPR_LZO; | |
1060 | else if (!strcmp(name, "zlib")) | |
1061 | c->mount_opts.compr_type = UBIFS_COMPR_ZLIB; | |
1062 | else { | |
235c362b | 1063 | ubifs_err(c, "unknown compressor \"%s\"", name); //FIXME: is c ready? |
553dea4d AB |
1064 | kfree(name); |
1065 | return -EINVAL; | |
1066 | } | |
1067 | kfree(name); | |
1068 | c->mount_opts.override_compr = 1; | |
1069 | c->default_compr = c->mount_opts.compr_type; | |
1070 | break; | |
1071 | } | |
c38c5a7f RW |
1072 | case Opt_assert: |
1073 | { | |
1074 | char *act = match_strdup(&args[0]); | |
1075 | ||
1076 | if (!act) | |
1077 | return -ENOMEM; | |
1078 | if (!strcmp(act, "report")) | |
1079 | c->assert_action = ASSACT_REPORT; | |
1080 | else if (!strcmp(act, "read-only")) | |
1081 | c->assert_action = ASSACT_RO; | |
1082 | else if (!strcmp(act, "panic")) | |
1083 | c->assert_action = ASSACT_PANIC; | |
1084 | else { | |
1085 | ubifs_err(c, "unknown assert action \"%s\"", act); | |
1086 | kfree(act); | |
1087 | return -EINVAL; | |
1088 | } | |
1089 | kfree(act); | |
1090 | break; | |
1091 | } | |
d8a22773 SH |
1092 | case Opt_auth_key: |
1093 | c->auth_key_name = kstrdup(args[0].from, GFP_KERNEL); | |
1094 | if (!c->auth_key_name) | |
1095 | return -ENOMEM; | |
1096 | break; | |
1097 | case Opt_auth_hash_name: | |
1098 | c->auth_hash_name = kstrdup(args[0].from, GFP_KERNEL); | |
1099 | if (!c->auth_hash_name) | |
1100 | return -ENOMEM; | |
1101 | break; | |
319c1042 RV |
1102 | case Opt_ignore: |
1103 | break; | |
1e51764a | 1104 | default: |
8379ea31 AB |
1105 | { |
1106 | unsigned long flag; | |
1107 | struct super_block *sb = c->vfs_sb; | |
1108 | ||
1109 | flag = parse_standard_option(p); | |
1110 | if (!flag) { | |
235c362b | 1111 | ubifs_err(c, "unrecognized mount option \"%s\" or missing value", |
79fda517 | 1112 | p); |
8379ea31 AB |
1113 | return -EINVAL; |
1114 | } | |
1115 | sb->s_flags |= flag; | |
1116 | break; | |
1117 | } | |
1e51764a AB |
1118 | } |
1119 | } | |
1120 | ||
1121 | return 0; | |
1122 | } | |
1123 | ||
1124 | /** | |
1125 | * destroy_journal - destroy journal data structures. | |
1126 | * @c: UBIFS file-system description object | |
1127 | * | |
1128 | * This function destroys journal data structures including those that may have | |
1129 | * been created by recovery functions. | |
1130 | */ | |
1131 | static void destroy_journal(struct ubifs_info *c) | |
1132 | { | |
1133 | while (!list_empty(&c->unclean_leb_list)) { | |
1134 | struct ubifs_unclean_leb *ucleb; | |
1135 | ||
1136 | ucleb = list_entry(c->unclean_leb_list.next, | |
1137 | struct ubifs_unclean_leb, list); | |
1138 | list_del(&ucleb->list); | |
1139 | kfree(ucleb); | |
1140 | } | |
1141 | while (!list_empty(&c->old_buds)) { | |
1142 | struct ubifs_bud *bud; | |
1143 | ||
1144 | bud = list_entry(c->old_buds.next, struct ubifs_bud, list); | |
1145 | list_del(&bud->list); | |
1146 | kfree(bud); | |
1147 | } | |
1148 | ubifs_destroy_idx_gc(c); | |
1149 | ubifs_destroy_size_tree(c); | |
1150 | ubifs_tnc_close(c); | |
1151 | free_buds(c); | |
1152 | } | |
1153 | ||
3477d204 AB |
1154 | /** |
1155 | * bu_init - initialize bulk-read information. | |
1156 | * @c: UBIFS file-system description object | |
1157 | */ | |
1158 | static void bu_init(struct ubifs_info *c) | |
1159 | { | |
6eb61d58 | 1160 | ubifs_assert(c, c->bulk_read == 1); |
3477d204 AB |
1161 | |
1162 | if (c->bu.buf) | |
1163 | return; /* Already initialized */ | |
1164 | ||
1165 | again: | |
1166 | c->bu.buf = kmalloc(c->max_bu_buf_len, GFP_KERNEL | __GFP_NOWARN); | |
1167 | if (!c->bu.buf) { | |
1168 | if (c->max_bu_buf_len > UBIFS_KMALLOC_OK) { | |
1169 | c->max_bu_buf_len = UBIFS_KMALLOC_OK; | |
1170 | goto again; | |
1171 | } | |
1172 | ||
1173 | /* Just disable bulk-read */ | |
235c362b | 1174 | ubifs_warn(c, "cannot allocate %d bytes of memory for bulk-read, disabling it", |
79fda517 | 1175 | c->max_bu_buf_len); |
3477d204 AB |
1176 | c->mount_opts.bulk_read = 1; |
1177 | c->bulk_read = 0; | |
1178 | return; | |
1179 | } | |
1180 | } | |
1181 | ||
57a450e9 AB |
1182 | /** |
1183 | * check_free_space - check if there is enough free space to mount. | |
1184 | * @c: UBIFS file-system description object | |
1185 | * | |
1186 | * This function makes sure UBIFS has enough free space to be mounted in | |
1187 | * read/write mode. UBIFS must always have some free space to allow deletions. | |
1188 | */ | |
1189 | static int check_free_space(struct ubifs_info *c) | |
1190 | { | |
6eb61d58 | 1191 | ubifs_assert(c, c->dark_wm > 0); |
57a450e9 | 1192 | if (c->lst.total_free + c->lst.total_dirty < c->dark_wm) { |
235c362b | 1193 | ubifs_err(c, "insufficient free space to mount in R/W mode"); |
edf6be24 AB |
1194 | ubifs_dump_budg(c, &c->bi); |
1195 | ubifs_dump_lprops(c); | |
a2b9df3f | 1196 | return -ENOSPC; |
57a450e9 AB |
1197 | } |
1198 | return 0; | |
1199 | } | |
1200 | ||
1e51764a AB |
1201 | /** |
1202 | * mount_ubifs - mount UBIFS file-system. | |
1203 | * @c: UBIFS file-system description object | |
1204 | * | |
1205 | * This function mounts UBIFS file system. Returns zero in case of success and | |
1206 | * a negative error code in case of failure. | |
1e51764a AB |
1207 | */ |
1208 | static int mount_ubifs(struct ubifs_info *c) | |
1209 | { | |
2ef13294 | 1210 | int err; |
3668b70f | 1211 | long long x, y; |
1e51764a AB |
1212 | size_t sz; |
1213 | ||
bc98a42c | 1214 | c->ro_mount = !!sb_rdonly(c->vfs_sb); |
1751e8a6 LT |
1215 | /* Suppress error messages while probing if SB_SILENT is set */ |
1216 | c->probing = !!(c->vfs_sb->s_flags & SB_SILENT); | |
90bea5a3 | 1217 | |
1e51764a AB |
1218 | err = init_constants_early(c); |
1219 | if (err) | |
1220 | return err; | |
1221 | ||
17c2f9f8 AB |
1222 | err = ubifs_debugging_init(c); |
1223 | if (err) | |
1224 | return err; | |
1e51764a AB |
1225 | |
1226 | err = check_volume_empty(c); | |
1227 | if (err) | |
1228 | goto out_free; | |
1229 | ||
2ef13294 | 1230 | if (c->empty && (c->ro_mount || c->ro_media)) { |
1e51764a AB |
1231 | /* |
1232 | * This UBI volume is empty, and read-only, or the file system | |
1233 | * is mounted read-only - we cannot format it. | |
1234 | */ | |
235c362b | 1235 | ubifs_err(c, "can't format empty UBI volume: read-only %s", |
1e51764a AB |
1236 | c->ro_media ? "UBI volume" : "mount"); |
1237 | err = -EROFS; | |
1238 | goto out_free; | |
1239 | } | |
1240 | ||
2ef13294 | 1241 | if (c->ro_media && !c->ro_mount) { |
235c362b | 1242 | ubifs_err(c, "cannot mount read-write - read-only media"); |
1e51764a AB |
1243 | err = -EROFS; |
1244 | goto out_free; | |
1245 | } | |
1246 | ||
1247 | /* | |
1248 | * The requirement for the buffer is that it should fit indexing B-tree | |
1249 | * height amount of integers. We assume the height if the TNC tree will | |
1250 | * never exceed 64. | |
1251 | */ | |
1252 | err = -ENOMEM; | |
6da2ec56 KC |
1253 | c->bottom_up_buf = kmalloc_array(BOTTOM_UP_HEIGHT, sizeof(int), |
1254 | GFP_KERNEL); | |
1e51764a AB |
1255 | if (!c->bottom_up_buf) |
1256 | goto out_free; | |
1257 | ||
1258 | c->sbuf = vmalloc(c->leb_size); | |
1259 | if (!c->sbuf) | |
1260 | goto out_free; | |
1261 | ||
2ef13294 | 1262 | if (!c->ro_mount) { |
1e51764a AB |
1263 | c->ileb_buf = vmalloc(c->leb_size); |
1264 | if (!c->ileb_buf) | |
1265 | goto out_free; | |
1266 | } | |
1267 | ||
3477d204 AB |
1268 | if (c->bulk_read == 1) |
1269 | bu_init(c); | |
1270 | ||
d882962f | 1271 | if (!c->ro_mount) { |
7799953b RW |
1272 | c->write_reserve_buf = kmalloc(COMPRESSED_DATA_NODE_BUF_SZ + \ |
1273 | UBIFS_CIPHER_BLOCK_SIZE, | |
d882962f MC |
1274 | GFP_KERNEL); |
1275 | if (!c->write_reserve_buf) | |
1276 | goto out_free; | |
1277 | } | |
1278 | ||
18d1d7fb | 1279 | c->mounting = 1; |
2953e73f | 1280 | |
d8a22773 SH |
1281 | if (c->auth_key_name) { |
1282 | if (IS_ENABLED(CONFIG_UBIFS_FS_AUTHENTICATION)) { | |
1283 | err = ubifs_init_authentication(c); | |
1284 | if (err) | |
1285 | goto out_free; | |
1286 | } else { | |
1287 | ubifs_err(c, "auth_key_name, but UBIFS is built without" | |
1288 | " authentication support"); | |
1289 | err = -EINVAL; | |
1290 | goto out_free; | |
1291 | } | |
1292 | } | |
1293 | ||
1e51764a AB |
1294 | err = ubifs_read_superblock(c); |
1295 | if (err) | |
1296 | goto out_free; | |
1297 | ||
90bea5a3 DG |
1298 | c->probing = 0; |
1299 | ||
1e51764a | 1300 | /* |
553dea4d | 1301 | * Make sure the compressor which is set as default in the superblock |
57a450e9 | 1302 | * or overridden by mount options is actually compiled in. |
1e51764a | 1303 | */ |
6eb61d58 | 1304 | if (!ubifs_compr_present(c, c->default_compr)) { |
235c362b | 1305 | ubifs_err(c, "'compressor \"%s\" is not compiled in", |
6eb61d58 | 1306 | ubifs_compr_name(c, c->default_compr)); |
8eec2f36 | 1307 | err = -ENOTSUPP; |
553dea4d | 1308 | goto out_free; |
1e51764a AB |
1309 | } |
1310 | ||
79807d07 | 1311 | err = init_constants_sb(c); |
1e51764a | 1312 | if (err) |
17c2f9f8 | 1313 | goto out_free; |
1e51764a AB |
1314 | |
1315 | sz = ALIGN(c->max_idx_node_sz, c->min_io_size); | |
1316 | sz = ALIGN(sz + c->max_idx_node_sz, c->min_io_size); | |
1317 | c->cbuf = kmalloc(sz, GFP_NOFS); | |
1318 | if (!c->cbuf) { | |
1319 | err = -ENOMEM; | |
17c2f9f8 | 1320 | goto out_free; |
1e51764a AB |
1321 | } |
1322 | ||
b50b9f40 AB |
1323 | err = alloc_wbufs(c); |
1324 | if (err) | |
1325 | goto out_cbuf; | |
1326 | ||
0855f310 | 1327 | sprintf(c->bgt_name, BGT_NAME_PATTERN, c->vi.ubi_num, c->vi.vol_id); |
2ef13294 | 1328 | if (!c->ro_mount) { |
1e51764a | 1329 | /* Create background thread */ |
fcabb347 | 1330 | c->bgt = kthread_create(ubifs_bg_thread, c, "%s", c->bgt_name); |
1e51764a AB |
1331 | if (IS_ERR(c->bgt)) { |
1332 | err = PTR_ERR(c->bgt); | |
1333 | c->bgt = NULL; | |
235c362b | 1334 | ubifs_err(c, "cannot spawn \"%s\", error %d", |
1e51764a AB |
1335 | c->bgt_name, err); |
1336 | goto out_wbufs; | |
1337 | } | |
1338 | wake_up_process(c->bgt); | |
1339 | } | |
1340 | ||
1341 | err = ubifs_read_master(c); | |
1342 | if (err) | |
1343 | goto out_master; | |
1344 | ||
09801194 BG |
1345 | init_constants_master(c); |
1346 | ||
1e51764a | 1347 | if ((c->mst_node->flags & cpu_to_le32(UBIFS_MST_DIRTY)) != 0) { |
235c362b | 1348 | ubifs_msg(c, "recovery needed"); |
1e51764a | 1349 | c->need_recovery = 1; |
781c5717 BG |
1350 | } |
1351 | ||
781c5717 BG |
1352 | if (c->need_recovery && !c->ro_mount) { |
1353 | err = ubifs_recover_inl_heads(c, c->sbuf); | |
1354 | if (err) | |
1355 | goto out_master; | |
1356 | } | |
1357 | ||
1358 | err = ubifs_lpt_init(c, 1, !c->ro_mount); | |
1359 | if (err) | |
1360 | goto out_master; | |
1361 | ||
09801194 BG |
1362 | if (!c->ro_mount && c->space_fixup) { |
1363 | err = ubifs_fixup_free_space(c); | |
1364 | if (err) | |
56b04e3e | 1365 | goto out_lpt; |
09801194 BG |
1366 | } |
1367 | ||
2c84599c | 1368 | if (!c->ro_mount && !c->need_recovery) { |
1e51764a AB |
1369 | /* |
1370 | * Set the "dirty" flag so that if we reboot uncleanly we | |
1371 | * will notice this immediately on the next mount. | |
1372 | */ | |
1373 | c->mst_node->flags |= cpu_to_le32(UBIFS_MST_DIRTY); | |
1374 | err = ubifs_write_master(c); | |
1375 | if (err) | |
781c5717 | 1376 | goto out_lpt; |
1e51764a AB |
1377 | } |
1378 | ||
b137545c | 1379 | err = dbg_check_idx_size(c, c->bi.old_idx_sz); |
1e51764a AB |
1380 | if (err) |
1381 | goto out_lpt; | |
1382 | ||
1383 | err = ubifs_replay_journal(c); | |
1384 | if (err) | |
1385 | goto out_journal; | |
1386 | ||
1fb8bd01 | 1387 | /* Calculate 'min_idx_lebs' after journal replay */ |
b137545c | 1388 | c->bi.min_idx_lebs = ubifs_calc_min_idx_lebs(c); |
1fb8bd01 | 1389 | |
2ef13294 | 1390 | err = ubifs_mount_orphans(c, c->need_recovery, c->ro_mount); |
1e51764a AB |
1391 | if (err) |
1392 | goto out_orphans; | |
1393 | ||
2ef13294 | 1394 | if (!c->ro_mount) { |
1e51764a AB |
1395 | int lnum; |
1396 | ||
57a450e9 AB |
1397 | err = check_free_space(c); |
1398 | if (err) | |
1e51764a | 1399 | goto out_orphans; |
1e51764a AB |
1400 | |
1401 | /* Check for enough log space */ | |
1402 | lnum = c->lhead_lnum + 1; | |
1403 | if (lnum >= UBIFS_LOG_LNUM + c->log_lebs) | |
1404 | lnum = UBIFS_LOG_LNUM; | |
1405 | if (lnum == c->ltail_lnum) { | |
1406 | err = ubifs_consolidate_log(c); | |
1407 | if (err) | |
1408 | goto out_orphans; | |
1409 | } | |
1410 | ||
1411 | if (c->need_recovery) { | |
1e76592f SH |
1412 | if (!ubifs_authenticated(c)) { |
1413 | err = ubifs_recover_size(c, true); | |
1414 | if (err) | |
1415 | goto out_orphans; | |
1416 | } | |
1417 | ||
1e51764a | 1418 | err = ubifs_rcvry_gc_commit(c); |
276de5d2 AB |
1419 | if (err) |
1420 | goto out_orphans; | |
1e76592f SH |
1421 | |
1422 | if (ubifs_authenticated(c)) { | |
1423 | err = ubifs_recover_size(c, false); | |
1424 | if (err) | |
1425 | goto out_orphans; | |
1426 | } | |
b4978e94 | 1427 | } else { |
1e51764a | 1428 | err = take_gc_lnum(c); |
b4978e94 AB |
1429 | if (err) |
1430 | goto out_orphans; | |
1431 | ||
1432 | /* | |
1433 | * GC LEB may contain garbage if there was an unclean | |
1434 | * reboot, and it should be un-mapped. | |
1435 | */ | |
1436 | err = ubifs_leb_unmap(c, c->gc_lnum); | |
1437 | if (err) | |
c18de72f | 1438 | goto out_orphans; |
b4978e94 | 1439 | } |
1e51764a AB |
1440 | |
1441 | err = dbg_check_lprops(c); | |
1442 | if (err) | |
1443 | goto out_orphans; | |
1444 | } else if (c->need_recovery) { | |
1e76592f | 1445 | err = ubifs_recover_size(c, false); |
1e51764a AB |
1446 | if (err) |
1447 | goto out_orphans; | |
b4978e94 AB |
1448 | } else { |
1449 | /* | |
1450 | * Even if we mount read-only, we have to set space in GC LEB | |
1451 | * to proper value because this affects UBIFS free space | |
1452 | * reporting. We do not want to have a situation when | |
1453 | * re-mounting from R/O to R/W changes amount of free space. | |
1454 | */ | |
1455 | err = take_gc_lnum(c); | |
1456 | if (err) | |
1457 | goto out_orphans; | |
1e51764a AB |
1458 | } |
1459 | ||
1460 | spin_lock(&ubifs_infos_lock); | |
1461 | list_add_tail(&c->infos_list, &ubifs_infos); | |
1462 | spin_unlock(&ubifs_infos_lock); | |
1463 | ||
1464 | if (c->need_recovery) { | |
2ef13294 | 1465 | if (c->ro_mount) |
235c362b | 1466 | ubifs_msg(c, "recovery deferred"); |
1e51764a AB |
1467 | else { |
1468 | c->need_recovery = 0; | |
235c362b | 1469 | ubifs_msg(c, "recovery completed"); |
b221337a AB |
1470 | /* |
1471 | * GC LEB has to be empty and taken at this point. But | |
1472 | * the journal head LEBs may also be accounted as | |
1473 | * "empty taken" if they are empty. | |
1474 | */ | |
6eb61d58 | 1475 | ubifs_assert(c, c->lst.taken_empty_lebs > 0); |
1e51764a | 1476 | } |
6ba87c9b | 1477 | } else |
6eb61d58 | 1478 | ubifs_assert(c, c->lst.taken_empty_lebs > 0); |
1e51764a | 1479 | |
6ba87c9b | 1480 | err = dbg_check_filesystem(c); |
552ff317 AB |
1481 | if (err) |
1482 | goto out_infos; | |
1483 | ||
6ba87c9b | 1484 | err = dbg_debugfs_init_fs(c); |
1e51764a AB |
1485 | if (err) |
1486 | goto out_infos; | |
1487 | ||
18d1d7fb | 1488 | c->mounting = 0; |
2953e73f | 1489 | |
235c362b | 1490 | ubifs_msg(c, "UBIFS: mounted UBI device %d, volume %d, name \"%s\"%s", |
3668b70f | 1491 | c->vi.ubi_num, c->vi.vol_id, c->vi.name, |
beadadfa | 1492 | c->ro_mount ? ", R/O mode" : ""); |
1e51764a | 1493 | x = (long long)c->main_lebs * c->leb_size; |
3668b70f | 1494 | y = (long long)c->log_lebs * c->leb_size + c->max_bud_bytes; |
235c362b | 1495 | ubifs_msg(c, "LEB size: %d bytes (%d KiB), min./max. I/O unit sizes: %d bytes/%d bytes", |
3668b70f AB |
1496 | c->leb_size, c->leb_size >> 10, c->min_io_size, |
1497 | c->max_write_size); | |
235c362b | 1498 | ubifs_msg(c, "FS size: %lld bytes (%lld MiB, %d LEBs), journal size %lld bytes (%lld MiB, %d LEBs)", |
3668b70f AB |
1499 | x, x >> 20, c->main_lebs, |
1500 | y, y >> 20, c->log_lebs + c->max_bud_cnt); | |
235c362b | 1501 | ubifs_msg(c, "reserved for root: %llu bytes (%llu KiB)", |
3668b70f | 1502 | c->report_rp_size, c->report_rp_size >> 10); |
235c362b | 1503 | ubifs_msg(c, "media format: w%d/r%d (latest is w%d/r%d), UUID %pUB%s", |
963f0cf6 | 1504 | c->fmt_version, c->ro_compat_version, |
3668b70f AB |
1505 | UBIFS_FORMAT_VERSION, UBIFS_RO_COMPAT_VERSION, c->uuid, |
1506 | c->big_lpt ? ", big LPT model" : ", small LPT model"); | |
1507 | ||
6eb61d58 | 1508 | dbg_gen("default compressor: %s", ubifs_compr_name(c, c->default_compr)); |
3668b70f | 1509 | dbg_gen("data journal heads: %d", |
1e51764a | 1510 | c->jhead_cnt - NONDATA_JHEADS_CNT); |
3668b70f | 1511 | dbg_gen("log LEBs: %d (%d - %d)", |
1e51764a | 1512 | c->log_lebs, UBIFS_LOG_LNUM, c->log_last); |
3668b70f | 1513 | dbg_gen("LPT area LEBs: %d (%d - %d)", |
1e51764a | 1514 | c->lpt_lebs, c->lpt_first, c->lpt_last); |
3668b70f | 1515 | dbg_gen("orphan area LEBs: %d (%d - %d)", |
1e51764a | 1516 | c->orph_lebs, c->orph_first, c->orph_last); |
3668b70f | 1517 | dbg_gen("main area LEBs: %d (%d - %d)", |
1e51764a | 1518 | c->main_lebs, c->main_first, c->leb_cnt - 1); |
3668b70f AB |
1519 | dbg_gen("index LEBs: %d", c->lst.idx_lebs); |
1520 | dbg_gen("total index bytes: %lld (%lld KiB, %lld MiB)", | |
b137545c AB |
1521 | c->bi.old_idx_sz, c->bi.old_idx_sz >> 10, |
1522 | c->bi.old_idx_sz >> 20); | |
3668b70f AB |
1523 | dbg_gen("key hash type: %d", c->key_hash_type); |
1524 | dbg_gen("tree fanout: %d", c->fanout); | |
1525 | dbg_gen("reserved GC LEB: %d", c->gc_lnum); | |
1526 | dbg_gen("max. znode size %d", c->max_znode_sz); | |
1527 | dbg_gen("max. index node size %d", c->max_idx_node_sz); | |
1528 | dbg_gen("node sizes: data %zu, inode %zu, dentry %zu", | |
8e5033ad | 1529 | UBIFS_DATA_NODE_SZ, UBIFS_INO_NODE_SZ, UBIFS_DENT_NODE_SZ); |
3668b70f | 1530 | dbg_gen("node sizes: trun %zu, sb %zu, master %zu", |
8e5033ad | 1531 | UBIFS_TRUN_NODE_SZ, UBIFS_SB_NODE_SZ, UBIFS_MST_NODE_SZ); |
3668b70f | 1532 | dbg_gen("node sizes: ref %zu, cmt. start %zu, orph %zu", |
8e5033ad | 1533 | UBIFS_REF_NODE_SZ, UBIFS_CS_NODE_SZ, UBIFS_ORPH_NODE_SZ); |
3668b70f | 1534 | dbg_gen("max. node sizes: data %zu, inode %zu dentry %zu, idx %d", |
c4361570 | 1535 | UBIFS_MAX_DATA_NODE_SZ, UBIFS_MAX_INO_NODE_SZ, |
6342aaeb | 1536 | UBIFS_MAX_DENT_NODE_SZ, ubifs_idx_node_sz(c, c->fanout)); |
3668b70f AB |
1537 | dbg_gen("dead watermark: %d", c->dead_wm); |
1538 | dbg_gen("dark watermark: %d", c->dark_wm); | |
1539 | dbg_gen("LEB overhead: %d", c->leb_overhead); | |
1e51764a | 1540 | x = (long long)c->main_lebs * c->dark_wm; |
3668b70f | 1541 | dbg_gen("max. dark space: %lld (%lld KiB, %lld MiB)", |
1e51764a | 1542 | x, x >> 10, x >> 20); |
3668b70f | 1543 | dbg_gen("maximum bud bytes: %lld (%lld KiB, %lld MiB)", |
1e51764a AB |
1544 | c->max_bud_bytes, c->max_bud_bytes >> 10, |
1545 | c->max_bud_bytes >> 20); | |
3668b70f | 1546 | dbg_gen("BG commit bud bytes: %lld (%lld KiB, %lld MiB)", |
1e51764a AB |
1547 | c->bg_bud_bytes, c->bg_bud_bytes >> 10, |
1548 | c->bg_bud_bytes >> 20); | |
3668b70f | 1549 | dbg_gen("current bud bytes %lld (%lld KiB, %lld MiB)", |
1e51764a | 1550 | c->bud_bytes, c->bud_bytes >> 10, c->bud_bytes >> 20); |
3668b70f AB |
1551 | dbg_gen("max. seq. number: %llu", c->max_sqnum); |
1552 | dbg_gen("commit number: %llu", c->cmt_no); | |
1e51764a AB |
1553 | |
1554 | return 0; | |
1555 | ||
1556 | out_infos: | |
1557 | spin_lock(&ubifs_infos_lock); | |
1558 | list_del(&c->infos_list); | |
1559 | spin_unlock(&ubifs_infos_lock); | |
1560 | out_orphans: | |
1561 | free_orphans(c); | |
1562 | out_journal: | |
1563 | destroy_journal(c); | |
1564 | out_lpt: | |
1565 | ubifs_lpt_free(c, 0); | |
1566 | out_master: | |
1567 | kfree(c->mst_node); | |
1568 | kfree(c->rcvrd_mst_node); | |
1569 | if (c->bgt) | |
1570 | kthread_stop(c->bgt); | |
1571 | out_wbufs: | |
1572 | free_wbufs(c); | |
1573 | out_cbuf: | |
1574 | kfree(c->cbuf); | |
1e51764a | 1575 | out_free: |
d882962f | 1576 | kfree(c->write_reserve_buf); |
3477d204 | 1577 | kfree(c->bu.buf); |
1e51764a AB |
1578 | vfree(c->ileb_buf); |
1579 | vfree(c->sbuf); | |
1580 | kfree(c->bottom_up_buf); | |
17c2f9f8 | 1581 | ubifs_debugging_exit(c); |
1e51764a AB |
1582 | return err; |
1583 | } | |
1584 | ||
1585 | /** | |
1586 | * ubifs_umount - un-mount UBIFS file-system. | |
1587 | * @c: UBIFS file-system description object | |
1588 | * | |
1589 | * Note, this function is called to free allocated resourced when un-mounting, | |
1590 | * as well as free resources when an error occurred while we were half way | |
1591 | * through mounting (error path cleanup function). So it has to make sure the | |
1592 | * resource was actually allocated before freeing it. | |
1593 | */ | |
1594 | static void ubifs_umount(struct ubifs_info *c) | |
1595 | { | |
1596 | dbg_gen("un-mounting UBI device %d, volume %d", c->vi.ubi_num, | |
1597 | c->vi.vol_id); | |
1598 | ||
552ff317 | 1599 | dbg_debugfs_exit_fs(c); |
1e51764a AB |
1600 | spin_lock(&ubifs_infos_lock); |
1601 | list_del(&c->infos_list); | |
1602 | spin_unlock(&ubifs_infos_lock); | |
1603 | ||
1604 | if (c->bgt) | |
1605 | kthread_stop(c->bgt); | |
1606 | ||
1607 | destroy_journal(c); | |
1608 | free_wbufs(c); | |
1609 | free_orphans(c); | |
1610 | ubifs_lpt_free(c, 0); | |
d8a22773 | 1611 | ubifs_exit_authentication(c); |
1e51764a | 1612 | |
d8a22773 SH |
1613 | kfree(c->auth_key_name); |
1614 | kfree(c->auth_hash_name); | |
1e51764a AB |
1615 | kfree(c->cbuf); |
1616 | kfree(c->rcvrd_mst_node); | |
1617 | kfree(c->mst_node); | |
d882962f | 1618 | kfree(c->write_reserve_buf); |
3477d204 AB |
1619 | kfree(c->bu.buf); |
1620 | vfree(c->ileb_buf); | |
1e51764a AB |
1621 | vfree(c->sbuf); |
1622 | kfree(c->bottom_up_buf); | |
17c2f9f8 | 1623 | ubifs_debugging_exit(c); |
1e51764a AB |
1624 | } |
1625 | ||
1626 | /** | |
1627 | * ubifs_remount_rw - re-mount in read-write mode. | |
1628 | * @c: UBIFS file-system description object | |
1629 | * | |
1630 | * UBIFS avoids allocating many unnecessary resources when mounted in read-only | |
1631 | * mode. This function allocates the needed resources and re-mounts UBIFS in | |
1632 | * read-write mode. | |
1633 | */ | |
1634 | static int ubifs_remount_rw(struct ubifs_info *c) | |
1635 | { | |
1636 | int err, lnum; | |
1637 | ||
963f0cf6 | 1638 | if (c->rw_incompat) { |
235c362b SY |
1639 | ubifs_err(c, "the file-system is not R/W-compatible"); |
1640 | 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 |
1641 | c->fmt_version, c->ro_compat_version, |
1642 | UBIFS_FORMAT_VERSION, UBIFS_RO_COMPAT_VERSION); | |
963f0cf6 AB |
1643 | return -EROFS; |
1644 | } | |
1645 | ||
1e51764a | 1646 | mutex_lock(&c->umount_mutex); |
84abf972 | 1647 | dbg_save_space_info(c); |
1e51764a | 1648 | c->remounting_rw = 1; |
c88ac00c | 1649 | c->ro_mount = 0; |
1e51764a | 1650 | |
67e753ca AB |
1651 | if (c->space_fixup) { |
1652 | err = ubifs_fixup_free_space(c); | |
1653 | if (err) | |
fcdd57c8 | 1654 | goto out; |
67e753ca AB |
1655 | } |
1656 | ||
57a450e9 AB |
1657 | err = check_free_space(c); |
1658 | if (err) | |
1e51764a | 1659 | goto out; |
1e51764a AB |
1660 | |
1661 | if (c->old_leb_cnt != c->leb_cnt) { | |
fd615005 | 1662 | struct ubifs_sb_node *sup = c->sup_node; |
1e51764a | 1663 | |
1e51764a AB |
1664 | sup->leb_cnt = cpu_to_le32(c->leb_cnt); |
1665 | err = ubifs_write_sb_node(c, sup); | |
1666 | if (err) | |
1667 | goto out; | |
1668 | } | |
1669 | ||
1670 | if (c->need_recovery) { | |
235c362b | 1671 | ubifs_msg(c, "completing deferred recovery"); |
1e51764a AB |
1672 | err = ubifs_write_rcvrd_mst_node(c); |
1673 | if (err) | |
1674 | goto out; | |
1e76592f SH |
1675 | if (!ubifs_authenticated(c)) { |
1676 | err = ubifs_recover_size(c, true); | |
1677 | if (err) | |
1678 | goto out; | |
1679 | } | |
1e51764a AB |
1680 | err = ubifs_clean_lebs(c, c->sbuf); |
1681 | if (err) | |
1682 | goto out; | |
1683 | err = ubifs_recover_inl_heads(c, c->sbuf); | |
1684 | if (err) | |
1685 | goto out; | |
49d128aa AH |
1686 | } else { |
1687 | /* A readonly mount is not allowed to have orphans */ | |
6eb61d58 | 1688 | ubifs_assert(c, c->tot_orphans == 0); |
49d128aa AH |
1689 | err = ubifs_clear_orphans(c); |
1690 | if (err) | |
1691 | goto out; | |
1e51764a AB |
1692 | } |
1693 | ||
1694 | if (!(c->mst_node->flags & cpu_to_le32(UBIFS_MST_DIRTY))) { | |
1695 | c->mst_node->flags |= cpu_to_le32(UBIFS_MST_DIRTY); | |
1696 | err = ubifs_write_master(c); | |
1697 | if (err) | |
1698 | goto out; | |
1699 | } | |
1700 | ||
1701 | c->ileb_buf = vmalloc(c->leb_size); | |
1702 | if (!c->ileb_buf) { | |
1703 | err = -ENOMEM; | |
1704 | goto out; | |
1705 | } | |
1706 | ||
7799953b RW |
1707 | c->write_reserve_buf = kmalloc(COMPRESSED_DATA_NODE_BUF_SZ + \ |
1708 | UBIFS_CIPHER_BLOCK_SIZE, GFP_KERNEL); | |
7203db97 WY |
1709 | if (!c->write_reserve_buf) { |
1710 | err = -ENOMEM; | |
d882962f | 1711 | goto out; |
7203db97 | 1712 | } |
d882962f | 1713 | |
1e51764a AB |
1714 | err = ubifs_lpt_init(c, 0, 1); |
1715 | if (err) | |
1716 | goto out; | |
1717 | ||
1e51764a | 1718 | /* Create background thread */ |
fcabb347 | 1719 | c->bgt = kthread_create(ubifs_bg_thread, c, "%s", c->bgt_name); |
1e51764a AB |
1720 | if (IS_ERR(c->bgt)) { |
1721 | err = PTR_ERR(c->bgt); | |
1722 | c->bgt = NULL; | |
235c362b | 1723 | ubifs_err(c, "cannot spawn \"%s\", error %d", |
1e51764a | 1724 | c->bgt_name, err); |
2953e73f | 1725 | goto out; |
1e51764a AB |
1726 | } |
1727 | wake_up_process(c->bgt); | |
1728 | ||
1729 | c->orph_buf = vmalloc(c->leb_size); | |
2953e73f AH |
1730 | if (!c->orph_buf) { |
1731 | err = -ENOMEM; | |
1732 | goto out; | |
1733 | } | |
1e51764a AB |
1734 | |
1735 | /* Check for enough log space */ | |
1736 | lnum = c->lhead_lnum + 1; | |
1737 | if (lnum >= UBIFS_LOG_LNUM + c->log_lebs) | |
1738 | lnum = UBIFS_LOG_LNUM; | |
1739 | if (lnum == c->ltail_lnum) { | |
1740 | err = ubifs_consolidate_log(c); | |
1741 | if (err) | |
1742 | goto out; | |
1743 | } | |
1744 | ||
1e76592f | 1745 | if (c->need_recovery) { |
1e51764a | 1746 | err = ubifs_rcvry_gc_commit(c); |
1e76592f SH |
1747 | if (err) |
1748 | goto out; | |
1749 | ||
1750 | if (ubifs_authenticated(c)) { | |
1751 | err = ubifs_recover_size(c, false); | |
1752 | if (err) | |
1753 | goto out; | |
1754 | } | |
1755 | } else { | |
b4978e94 | 1756 | err = ubifs_leb_unmap(c, c->gc_lnum); |
1e76592f | 1757 | } |
1e51764a AB |
1758 | if (err) |
1759 | goto out; | |
1760 | ||
8c230d9a AB |
1761 | dbg_gen("re-mounted read-write"); |
1762 | c->remounting_rw = 0; | |
1763 | ||
1e51764a AB |
1764 | if (c->need_recovery) { |
1765 | c->need_recovery = 0; | |
235c362b | 1766 | ubifs_msg(c, "deferred recovery completed"); |
8c230d9a AB |
1767 | } else { |
1768 | /* | |
1769 | * Do not run the debugging space check if the were doing | |
1770 | * recovery, because when we saved the information we had the | |
1771 | * file-system in a state where the TNC and lprops has been | |
1772 | * modified in memory, but all the I/O operations (including a | |
1773 | * commit) were deferred. So the file-system was in | |
1774 | * "non-committed" state. Now the file-system is in committed | |
1775 | * state, and of course the amount of free space will change | |
1776 | * because, for example, the old index size was imprecise. | |
1777 | */ | |
1778 | err = dbg_check_space_info(c); | |
1e51764a | 1779 | } |
9d510db4 | 1780 | |
1e51764a | 1781 | mutex_unlock(&c->umount_mutex); |
84abf972 | 1782 | return err; |
1e51764a AB |
1783 | |
1784 | out: | |
c88ac00c | 1785 | c->ro_mount = 1; |
1e51764a AB |
1786 | vfree(c->orph_buf); |
1787 | c->orph_buf = NULL; | |
1788 | if (c->bgt) { | |
1789 | kthread_stop(c->bgt); | |
1790 | c->bgt = NULL; | |
1791 | } | |
1792 | free_wbufs(c); | |
d882962f MC |
1793 | kfree(c->write_reserve_buf); |
1794 | c->write_reserve_buf = NULL; | |
1e51764a AB |
1795 | vfree(c->ileb_buf); |
1796 | c->ileb_buf = NULL; | |
1797 | ubifs_lpt_free(c, 1); | |
1798 | c->remounting_rw = 0; | |
1799 | mutex_unlock(&c->umount_mutex); | |
1800 | return err; | |
1801 | } | |
1802 | ||
1e51764a AB |
1803 | /** |
1804 | * ubifs_remount_ro - re-mount in read-only mode. | |
1805 | * @c: UBIFS file-system description object | |
1806 | * | |
84abf972 AB |
1807 | * We assume VFS has stopped writing. Possibly the background thread could be |
1808 | * running a commit, however kthread_stop will wait in that case. | |
1e51764a AB |
1809 | */ |
1810 | static void ubifs_remount_ro(struct ubifs_info *c) | |
1811 | { | |
1812 | int i, err; | |
1813 | ||
6eb61d58 RW |
1814 | ubifs_assert(c, !c->need_recovery); |
1815 | ubifs_assert(c, !c->ro_mount); | |
e4d9b6cb | 1816 | |
1e51764a AB |
1817 | mutex_lock(&c->umount_mutex); |
1818 | if (c->bgt) { | |
1819 | kthread_stop(c->bgt); | |
1820 | c->bgt = NULL; | |
1821 | } | |
1822 | ||
84abf972 AB |
1823 | dbg_save_space_info(c); |
1824 | ||
aac17948 RW |
1825 | for (i = 0; i < c->jhead_cnt; i++) { |
1826 | err = ubifs_wbuf_sync(&c->jheads[i].wbuf); | |
1827 | if (err) | |
1828 | ubifs_ro_mode(c, err); | |
1829 | } | |
1e51764a | 1830 | |
e4d9b6cb AB |
1831 | c->mst_node->flags &= ~cpu_to_le32(UBIFS_MST_DIRTY); |
1832 | c->mst_node->flags |= cpu_to_le32(UBIFS_MST_NO_ORPHS); | |
1833 | c->mst_node->gc_lnum = cpu_to_le32(c->gc_lnum); | |
1834 | err = ubifs_write_master(c); | |
1835 | if (err) | |
1836 | ubifs_ro_mode(c, err); | |
1837 | ||
1e51764a AB |
1838 | vfree(c->orph_buf); |
1839 | c->orph_buf = NULL; | |
d882962f MC |
1840 | kfree(c->write_reserve_buf); |
1841 | c->write_reserve_buf = NULL; | |
1e51764a AB |
1842 | vfree(c->ileb_buf); |
1843 | c->ileb_buf = NULL; | |
1844 | ubifs_lpt_free(c, 1); | |
2ef13294 | 1845 | c->ro_mount = 1; |
84abf972 AB |
1846 | err = dbg_check_space_info(c); |
1847 | if (err) | |
1848 | ubifs_ro_mode(c, err); | |
1e51764a AB |
1849 | mutex_unlock(&c->umount_mutex); |
1850 | } | |
1851 | ||
1852 | static void ubifs_put_super(struct super_block *sb) | |
1853 | { | |
1854 | int i; | |
1855 | struct ubifs_info *c = sb->s_fs_info; | |
1856 | ||
235c362b | 1857 | ubifs_msg(c, "un-mount UBI device %d", c->vi.ubi_num); |
6cfd0148 | 1858 | |
1e51764a AB |
1859 | /* |
1860 | * The following asserts are only valid if there has not been a failure | |
1861 | * of the media. For example, there will be dirty inodes if we failed | |
1862 | * to write them back because of I/O errors. | |
1863 | */ | |
1a067a22 | 1864 | if (!c->ro_error) { |
6eb61d58 RW |
1865 | ubifs_assert(c, c->bi.idx_growth == 0); |
1866 | ubifs_assert(c, c->bi.dd_growth == 0); | |
1867 | ubifs_assert(c, c->bi.data_growth == 0); | |
1a067a22 | 1868 | } |
1e51764a AB |
1869 | |
1870 | /* | |
1871 | * The 'c->umount_lock' prevents races between UBIFS memory shrinker | |
1872 | * and file system un-mount. Namely, it prevents the shrinker from | |
1873 | * picking this superblock for shrinking - it will be just skipped if | |
1874 | * the mutex is locked. | |
1875 | */ | |
1876 | mutex_lock(&c->umount_mutex); | |
2ef13294 | 1877 | if (!c->ro_mount) { |
1e51764a AB |
1878 | /* |
1879 | * First of all kill the background thread to make sure it does | |
1880 | * not interfere with un-mounting and freeing resources. | |
1881 | */ | |
1882 | if (c->bgt) { | |
1883 | kthread_stop(c->bgt); | |
1884 | c->bgt = NULL; | |
1885 | } | |
1886 | ||
1e51764a | 1887 | /* |
2680d722 | 1888 | * On fatal errors c->ro_error is set to 1, in which case we do |
1e51764a AB |
1889 | * not write the master node. |
1890 | */ | |
2680d722 | 1891 | if (!c->ro_error) { |
2ef13294 AB |
1892 | int err; |
1893 | ||
1894 | /* Synchronize write-buffers */ | |
aac17948 RW |
1895 | for (i = 0; i < c->jhead_cnt; i++) { |
1896 | err = ubifs_wbuf_sync(&c->jheads[i].wbuf); | |
1897 | if (err) | |
1898 | ubifs_ro_mode(c, err); | |
1899 | } | |
2ef13294 | 1900 | |
1e51764a AB |
1901 | /* |
1902 | * We are being cleanly unmounted which means the | |
1903 | * orphans were killed - indicate this in the master | |
1904 | * node. Also save the reserved GC LEB number. | |
1905 | */ | |
1e51764a AB |
1906 | c->mst_node->flags &= ~cpu_to_le32(UBIFS_MST_DIRTY); |
1907 | c->mst_node->flags |= cpu_to_le32(UBIFS_MST_NO_ORPHS); | |
1908 | c->mst_node->gc_lnum = cpu_to_le32(c->gc_lnum); | |
1909 | err = ubifs_write_master(c); | |
1910 | if (err) | |
1911 | /* | |
1912 | * Recovery will attempt to fix the master area | |
1913 | * next mount, so we just print a message and | |
1914 | * continue to unmount normally. | |
1915 | */ | |
235c362b | 1916 | ubifs_err(c, "failed to write master node, error %d", |
79fda517 | 1917 | err); |
3601ba27 AB |
1918 | } else { |
1919 | for (i = 0; i < c->jhead_cnt; i++) | |
1920 | /* Make sure write-buffer timers are canceled */ | |
1921 | hrtimer_cancel(&c->jheads[i].wbuf.timer); | |
1e51764a AB |
1922 | } |
1923 | } | |
1924 | ||
1925 | ubifs_umount(c); | |
1e51764a AB |
1926 | ubi_close_volume(c->ubi); |
1927 | mutex_unlock(&c->umount_mutex); | |
1e51764a AB |
1928 | } |
1929 | ||
1930 | static int ubifs_remount_fs(struct super_block *sb, int *flags, char *data) | |
1931 | { | |
1932 | int err; | |
1933 | struct ubifs_info *c = sb->s_fs_info; | |
1934 | ||
02b9984d | 1935 | sync_filesystem(sb); |
1e51764a AB |
1936 | dbg_gen("old flags %#lx, new flags %#x", sb->s_flags, *flags); |
1937 | ||
1938 | err = ubifs_parse_options(c, data, 1); | |
1939 | if (err) { | |
235c362b | 1940 | ubifs_err(c, "invalid or unknown remount parameter"); |
1e51764a AB |
1941 | return err; |
1942 | } | |
3477d204 | 1943 | |
1751e8a6 | 1944 | if (c->ro_mount && !(*flags & SB_RDONLY)) { |
2680d722 | 1945 | if (c->ro_error) { |
235c362b | 1946 | ubifs_msg(c, "cannot re-mount R/W due to prior errors"); |
2680d722 AB |
1947 | return -EROFS; |
1948 | } | |
e4d9b6cb | 1949 | if (c->ro_media) { |
235c362b | 1950 | ubifs_msg(c, "cannot re-mount R/W - UBI volume is R/O"); |
a2b9df3f | 1951 | return -EROFS; |
e4d9b6cb | 1952 | } |
1e51764a | 1953 | err = ubifs_remount_rw(c); |
e9d6bbc4 | 1954 | if (err) |
1e51764a | 1955 | return err; |
1751e8a6 | 1956 | } else if (!c->ro_mount && (*flags & SB_RDONLY)) { |
2680d722 | 1957 | if (c->ro_error) { |
235c362b | 1958 | ubifs_msg(c, "cannot re-mount R/O due to prior errors"); |
a2b9df3f | 1959 | return -EROFS; |
b466f17d | 1960 | } |
1e51764a | 1961 | ubifs_remount_ro(c); |
b466f17d | 1962 | } |
1e51764a | 1963 | |
3477d204 AB |
1964 | if (c->bulk_read == 1) |
1965 | bu_init(c); | |
1966 | else { | |
1967 | dbg_gen("disable bulk-read"); | |
07d41c3c | 1968 | mutex_lock(&c->bu_mutex); |
3477d204 AB |
1969 | kfree(c->bu.buf); |
1970 | c->bu.buf = NULL; | |
07d41c3c | 1971 | mutex_unlock(&c->bu_mutex); |
3477d204 AB |
1972 | } |
1973 | ||
d3bdc016 SH |
1974 | if (!c->need_recovery) |
1975 | ubifs_assert(c, c->lst.taken_empty_lebs > 0); | |
1976 | ||
1e51764a AB |
1977 | return 0; |
1978 | } | |
1979 | ||
e8b81566 | 1980 | const struct super_operations ubifs_super_operations = { |
1e51764a AB |
1981 | .alloc_inode = ubifs_alloc_inode, |
1982 | .destroy_inode = ubifs_destroy_inode, | |
1983 | .put_super = ubifs_put_super, | |
1984 | .write_inode = ubifs_write_inode, | |
d640e1b5 | 1985 | .evict_inode = ubifs_evict_inode, |
1e51764a AB |
1986 | .statfs = ubifs_statfs, |
1987 | .dirty_inode = ubifs_dirty_inode, | |
1988 | .remount_fs = ubifs_remount_fs, | |
1989 | .show_options = ubifs_show_options, | |
1990 | .sync_fs = ubifs_sync_fs, | |
1991 | }; | |
1992 | ||
1993 | /** | |
1994 | * open_ubi - parse UBI device name string and open the UBI device. | |
1995 | * @name: UBI volume name | |
1996 | * @mode: UBI volume open mode | |
1997 | * | |
9722324e CC |
1998 | * The primary method of mounting UBIFS is by specifying the UBI volume |
1999 | * character device node path. However, UBIFS may also be mounted withoug any | |
2000 | * character device node using one of the following methods: | |
2001 | * | |
2002 | * o ubiX_Y - mount UBI device number X, volume Y; | |
2003 | * o ubiY - mount UBI device number 0, volume Y; | |
1e51764a AB |
2004 | * o ubiX:NAME - mount UBI device X, volume with name NAME; |
2005 | * o ubi:NAME - mount UBI device 0, volume with name NAME. | |
2006 | * | |
2007 | * Alternative '!' separator may be used instead of ':' (because some shells | |
2008 | * like busybox may interpret ':' as an NFS host name separator). This function | |
9722324e CC |
2009 | * returns UBI volume description object in case of success and a negative |
2010 | * error code in case of failure. | |
1e51764a AB |
2011 | */ |
2012 | static struct ubi_volume_desc *open_ubi(const char *name, int mode) | |
2013 | { | |
9722324e | 2014 | struct ubi_volume_desc *ubi; |
1e51764a AB |
2015 | int dev, vol; |
2016 | char *endptr; | |
2017 | ||
37f31b6c RW |
2018 | if (!name || !*name) |
2019 | return ERR_PTR(-EINVAL); | |
2020 | ||
9722324e CC |
2021 | /* First, try to open using the device node path method */ |
2022 | ubi = ubi_open_volume_path(name, mode); | |
2023 | if (!IS_ERR(ubi)) | |
2024 | return ubi; | |
2025 | ||
2026 | /* Try the "nodev" method */ | |
1e51764a AB |
2027 | if (name[0] != 'u' || name[1] != 'b' || name[2] != 'i') |
2028 | return ERR_PTR(-EINVAL); | |
2029 | ||
2030 | /* ubi:NAME method */ | |
2031 | if ((name[3] == ':' || name[3] == '!') && name[4] != '\0') | |
2032 | return ubi_open_volume_nm(0, name + 4, mode); | |
2033 | ||
2034 | if (!isdigit(name[3])) | |
2035 | return ERR_PTR(-EINVAL); | |
2036 | ||
2037 | dev = simple_strtoul(name + 3, &endptr, 0); | |
2038 | ||
2039 | /* ubiY method */ | |
2040 | if (*endptr == '\0') | |
2041 | return ubi_open_volume(0, dev, mode); | |
2042 | ||
2043 | /* ubiX_Y method */ | |
2044 | if (*endptr == '_' && isdigit(endptr[1])) { | |
2045 | vol = simple_strtoul(endptr + 1, &endptr, 0); | |
2046 | if (*endptr != '\0') | |
2047 | return ERR_PTR(-EINVAL); | |
2048 | return ubi_open_volume(dev, vol, mode); | |
2049 | } | |
2050 | ||
2051 | /* ubiX:NAME method */ | |
2052 | if ((*endptr == ':' || *endptr == '!') && endptr[1] != '\0') | |
2053 | return ubi_open_volume_nm(dev, ++endptr, mode); | |
2054 | ||
2055 | return ERR_PTR(-EINVAL); | |
2056 | } | |
2057 | ||
b1c27ab3 AV |
2058 | static struct ubifs_info *alloc_ubifs_info(struct ubi_volume_desc *ubi) |
2059 | { | |
2060 | struct ubifs_info *c; | |
2061 | ||
2062 | c = kzalloc(sizeof(struct ubifs_info), GFP_KERNEL); | |
2063 | if (c) { | |
2064 | spin_lock_init(&c->cnt_lock); | |
2065 | spin_lock_init(&c->cs_lock); | |
2066 | spin_lock_init(&c->buds_lock); | |
2067 | spin_lock_init(&c->space_lock); | |
2068 | spin_lock_init(&c->orphan_lock); | |
2069 | init_rwsem(&c->commit_sem); | |
2070 | mutex_init(&c->lp_mutex); | |
2071 | mutex_init(&c->tnc_mutex); | |
2072 | mutex_init(&c->log_mutex); | |
b1c27ab3 AV |
2073 | mutex_init(&c->umount_mutex); |
2074 | mutex_init(&c->bu_mutex); | |
2075 | mutex_init(&c->write_reserve_mutex); | |
2076 | init_waitqueue_head(&c->cmt_wq); | |
2077 | c->buds = RB_ROOT; | |
2078 | c->old_idx = RB_ROOT; | |
2079 | c->size_tree = RB_ROOT; | |
2080 | c->orph_tree = RB_ROOT; | |
2081 | INIT_LIST_HEAD(&c->infos_list); | |
2082 | INIT_LIST_HEAD(&c->idx_gc); | |
2083 | INIT_LIST_HEAD(&c->replay_list); | |
2084 | INIT_LIST_HEAD(&c->replay_buds); | |
2085 | INIT_LIST_HEAD(&c->uncat_list); | |
2086 | INIT_LIST_HEAD(&c->empty_list); | |
2087 | INIT_LIST_HEAD(&c->freeable_list); | |
2088 | INIT_LIST_HEAD(&c->frdi_idx_list); | |
2089 | INIT_LIST_HEAD(&c->unclean_leb_list); | |
2090 | INIT_LIST_HEAD(&c->old_buds); | |
2091 | INIT_LIST_HEAD(&c->orph_list); | |
2092 | INIT_LIST_HEAD(&c->orph_new); | |
2093 | c->no_chk_data_crc = 1; | |
99a24e02 | 2094 | c->assert_action = ASSACT_RO; |
b1c27ab3 AV |
2095 | |
2096 | c->highest_inum = UBIFS_FIRST_INO; | |
2097 | c->lhead_lnum = c->ltail_lnum = UBIFS_LOG_LNUM; | |
2098 | ||
2099 | ubi_get_volume_info(ubi, &c->vi); | |
2100 | ubi_get_device_info(c->vi.ubi_num, &c->di); | |
2101 | } | |
2102 | return c; | |
2103 | } | |
2104 | ||
1e51764a AB |
2105 | static int ubifs_fill_super(struct super_block *sb, void *data, int silent) |
2106 | { | |
d251ed27 | 2107 | struct ubifs_info *c = sb->s_fs_info; |
1e51764a AB |
2108 | struct inode *root; |
2109 | int err; | |
2110 | ||
8379ea31 | 2111 | c->vfs_sb = sb; |
1e51764a AB |
2112 | /* Re-open the UBI device in read-write mode */ |
2113 | c->ubi = ubi_open_volume(c->vi.ubi_num, c->vi.vol_id, UBI_READWRITE); | |
2114 | if (IS_ERR(c->ubi)) { | |
2115 | err = PTR_ERR(c->ubi); | |
d251ed27 | 2116 | goto out; |
1e51764a AB |
2117 | } |
2118 | ||
99edd458 JK |
2119 | err = ubifs_parse_options(c, data, 0); |
2120 | if (err) | |
2121 | goto out_close; | |
2122 | ||
1e51764a | 2123 | /* |
0a883a05 | 2124 | * UBIFS provides 'backing_dev_info' in order to disable read-ahead. For |
1e51764a AB |
2125 | * UBIFS, I/O is not deferred, it is done immediately in readpage, |
2126 | * which means the user would have to wait not just for their own I/O | |
0a883a05 | 2127 | * but the read-ahead I/O as well i.e. completely pointless. |
1e51764a | 2128 | * |
99edd458 JK |
2129 | * Read-ahead will be disabled because @sb->s_bdi->ra_pages is 0. Also |
2130 | * @sb->s_bdi->capabilities are initialized to 0 so there won't be any | |
2131 | * writeback happening. | |
1e51764a | 2132 | */ |
99edd458 JK |
2133 | err = super_setup_bdi_name(sb, "ubifs_%d_%d", c->vi.ubi_num, |
2134 | c->vi.vol_id); | |
1e51764a AB |
2135 | if (err) |
2136 | goto out_close; | |
1e51764a | 2137 | |
1e51764a AB |
2138 | sb->s_fs_info = c; |
2139 | sb->s_magic = UBIFS_SUPER_MAGIC; | |
2140 | sb->s_blocksize = UBIFS_BLOCK_SIZE; | |
2141 | sb->s_blocksize_bits = UBIFS_BLOCK_SHIFT; | |
1e51764a AB |
2142 | sb->s_maxbytes = c->max_inode_sz = key_max_inode_size(c); |
2143 | if (c->max_inode_sz > MAX_LFS_FILESIZE) | |
2144 | sb->s_maxbytes = c->max_inode_sz = MAX_LFS_FILESIZE; | |
2145 | sb->s_op = &ubifs_super_operations; | |
7e5471ce | 2146 | #ifdef CONFIG_UBIFS_FS_XATTR |
2b88fc21 | 2147 | sb->s_xattr = ubifs_xattr_handlers; |
7e5471ce | 2148 | #endif |
643fa961 | 2149 | #ifdef CONFIG_FS_ENCRYPTION |
d475a507 | 2150 | sb->s_cop = &ubifs_crypt_operations; |
ffcc4182 | 2151 | #endif |
1e51764a AB |
2152 | |
2153 | mutex_lock(&c->umount_mutex); | |
2154 | err = mount_ubifs(c); | |
2155 | if (err) { | |
6eb61d58 | 2156 | ubifs_assert(c, err < 0); |
1e51764a AB |
2157 | goto out_unlock; |
2158 | } | |
2159 | ||
2160 | /* Read the root inode */ | |
2161 | root = ubifs_iget(sb, UBIFS_ROOT_INO); | |
2162 | if (IS_ERR(root)) { | |
2163 | err = PTR_ERR(root); | |
2164 | goto out_umount; | |
2165 | } | |
2166 | ||
48fde701 | 2167 | sb->s_root = d_make_root(root); |
7203db97 WY |
2168 | if (!sb->s_root) { |
2169 | err = -ENOMEM; | |
48fde701 | 2170 | goto out_umount; |
7203db97 | 2171 | } |
1e51764a AB |
2172 | |
2173 | mutex_unlock(&c->umount_mutex); | |
1e51764a AB |
2174 | return 0; |
2175 | ||
1e51764a AB |
2176 | out_umount: |
2177 | ubifs_umount(c); | |
2178 | out_unlock: | |
2179 | mutex_unlock(&c->umount_mutex); | |
1e51764a AB |
2180 | out_close: |
2181 | ubi_close_volume(c->ubi); | |
d251ed27 | 2182 | out: |
1e51764a AB |
2183 | return err; |
2184 | } | |
2185 | ||
2186 | static int sb_test(struct super_block *sb, void *data) | |
2187 | { | |
d251ed27 | 2188 | struct ubifs_info *c1 = data; |
7c83f5cb | 2189 | struct ubifs_info *c = sb->s_fs_info; |
1e51764a | 2190 | |
d251ed27 AV |
2191 | return c->vi.cdev == c1->vi.cdev; |
2192 | } | |
2193 | ||
2194 | static int sb_set(struct super_block *sb, void *data) | |
2195 | { | |
2196 | sb->s_fs_info = data; | |
2197 | return set_anon_super(sb, NULL); | |
1e51764a AB |
2198 | } |
2199 | ||
157d81e7 AV |
2200 | static struct dentry *ubifs_mount(struct file_system_type *fs_type, int flags, |
2201 | const char *name, void *data) | |
1e51764a AB |
2202 | { |
2203 | struct ubi_volume_desc *ubi; | |
d251ed27 | 2204 | struct ubifs_info *c; |
1e51764a AB |
2205 | struct super_block *sb; |
2206 | int err; | |
2207 | ||
2208 | dbg_gen("name %s, flags %#x", name, flags); | |
2209 | ||
2210 | /* | |
2211 | * Get UBI device number and volume ID. Mount it read-only so far | |
2212 | * because this might be a new mount point, and UBI allows only one | |
2213 | * read-write user at a time. | |
2214 | */ | |
2215 | ubi = open_ubi(name, UBI_READONLY); | |
2216 | if (IS_ERR(ubi)) { | |
1751e8a6 | 2217 | if (!(flags & SB_SILENT)) |
1ae92642 DG |
2218 | pr_err("UBIFS error (pid: %d): cannot open \"%s\", error %d", |
2219 | current->pid, name, (int)PTR_ERR(ubi)); | |
157d81e7 | 2220 | return ERR_CAST(ubi); |
1e51764a | 2221 | } |
1e51764a | 2222 | |
d251ed27 AV |
2223 | c = alloc_ubifs_info(ubi); |
2224 | if (!c) { | |
2225 | err = -ENOMEM; | |
2226 | goto out_close; | |
2227 | } | |
2228 | ||
2229 | dbg_gen("opened ubi%d_%d", c->vi.ubi_num, c->vi.vol_id); | |
1e51764a | 2230 | |
9249e17f | 2231 | sb = sget(fs_type, sb_test, sb_set, flags, c); |
1e51764a AB |
2232 | if (IS_ERR(sb)) { |
2233 | err = PTR_ERR(sb); | |
d251ed27 | 2234 | kfree(c); |
185bf873 | 2235 | goto out_close; |
1e51764a AB |
2236 | } |
2237 | ||
2238 | if (sb->s_root) { | |
2ef13294 | 2239 | struct ubifs_info *c1 = sb->s_fs_info; |
d251ed27 | 2240 | kfree(c); |
1e51764a AB |
2241 | /* A new mount point for already mounted UBIFS */ |
2242 | dbg_gen("this ubi volume is already mounted"); | |
1751e8a6 | 2243 | if (!!(flags & SB_RDONLY) != c1->ro_mount) { |
1e51764a AB |
2244 | err = -EBUSY; |
2245 | goto out_deact; | |
2246 | } | |
2247 | } else { | |
1751e8a6 | 2248 | err = ubifs_fill_super(sb, data, flags & SB_SILENT ? 1 : 0); |
1e51764a AB |
2249 | if (err) |
2250 | goto out_deact; | |
2251 | /* We do not support atime */ | |
1751e8a6 | 2252 | sb->s_flags |= SB_ACTIVE; |
8c1c5f26 | 2253 | #ifndef CONFIG_UBIFS_ATIME_SUPPORT |
1751e8a6 | 2254 | sb->s_flags |= SB_NOATIME; |
8c1c5f26 DY |
2255 | #else |
2256 | ubifs_msg(c, "full atime support is enabled."); | |
2257 | #endif | |
1e51764a AB |
2258 | } |
2259 | ||
2260 | /* 'fill_super()' opens ubi again so we must close it here */ | |
2261 | ubi_close_volume(ubi); | |
2262 | ||
157d81e7 | 2263 | return dget(sb->s_root); |
1e51764a AB |
2264 | |
2265 | out_deact: | |
6f5bbff9 | 2266 | deactivate_locked_super(sb); |
1e51764a AB |
2267 | out_close: |
2268 | ubi_close_volume(ubi); | |
157d81e7 | 2269 | return ERR_PTR(err); |
1e51764a AB |
2270 | } |
2271 | ||
d251ed27 AV |
2272 | static void kill_ubifs_super(struct super_block *s) |
2273 | { | |
2274 | struct ubifs_info *c = s->s_fs_info; | |
2275 | kill_anon_super(s); | |
2276 | kfree(c); | |
2277 | } | |
2278 | ||
1e51764a AB |
2279 | static struct file_system_type ubifs_fs_type = { |
2280 | .name = "ubifs", | |
2281 | .owner = THIS_MODULE, | |
157d81e7 | 2282 | .mount = ubifs_mount, |
d251ed27 | 2283 | .kill_sb = kill_ubifs_super, |
1e51764a | 2284 | }; |
7f78e035 | 2285 | MODULE_ALIAS_FS("ubifs"); |
1e51764a AB |
2286 | |
2287 | /* | |
2288 | * Inode slab cache constructor. | |
2289 | */ | |
51cc5068 | 2290 | static void inode_slab_ctor(void *obj) |
1e51764a AB |
2291 | { |
2292 | struct ubifs_inode *ui = obj; | |
2293 | inode_init_once(&ui->vfs_inode); | |
2294 | } | |
2295 | ||
2296 | static int __init ubifs_init(void) | |
2297 | { | |
2298 | int err; | |
2299 | ||
2300 | BUILD_BUG_ON(sizeof(struct ubifs_ch) != 24); | |
2301 | ||
2302 | /* Make sure node sizes are 8-byte aligned */ | |
2303 | BUILD_BUG_ON(UBIFS_CH_SZ & 7); | |
2304 | BUILD_BUG_ON(UBIFS_INO_NODE_SZ & 7); | |
2305 | BUILD_BUG_ON(UBIFS_DENT_NODE_SZ & 7); | |
2306 | BUILD_BUG_ON(UBIFS_XENT_NODE_SZ & 7); | |
2307 | BUILD_BUG_ON(UBIFS_DATA_NODE_SZ & 7); | |
2308 | BUILD_BUG_ON(UBIFS_TRUN_NODE_SZ & 7); | |
2309 | BUILD_BUG_ON(UBIFS_SB_NODE_SZ & 7); | |
2310 | BUILD_BUG_ON(UBIFS_MST_NODE_SZ & 7); | |
2311 | BUILD_BUG_ON(UBIFS_REF_NODE_SZ & 7); | |
2312 | BUILD_BUG_ON(UBIFS_CS_NODE_SZ & 7); | |
2313 | BUILD_BUG_ON(UBIFS_ORPH_NODE_SZ & 7); | |
2314 | ||
2315 | BUILD_BUG_ON(UBIFS_MAX_DENT_NODE_SZ & 7); | |
2316 | BUILD_BUG_ON(UBIFS_MAX_XENT_NODE_SZ & 7); | |
2317 | BUILD_BUG_ON(UBIFS_MAX_DATA_NODE_SZ & 7); | |
2318 | BUILD_BUG_ON(UBIFS_MAX_INO_NODE_SZ & 7); | |
2319 | BUILD_BUG_ON(UBIFS_MAX_NODE_SZ & 7); | |
2320 | BUILD_BUG_ON(MIN_WRITE_SZ & 7); | |
2321 | ||
2322 | /* Check min. node size */ | |
2323 | BUILD_BUG_ON(UBIFS_INO_NODE_SZ < MIN_WRITE_SZ); | |
2324 | BUILD_BUG_ON(UBIFS_DENT_NODE_SZ < MIN_WRITE_SZ); | |
2325 | BUILD_BUG_ON(UBIFS_XENT_NODE_SZ < MIN_WRITE_SZ); | |
2326 | BUILD_BUG_ON(UBIFS_TRUN_NODE_SZ < MIN_WRITE_SZ); | |
2327 | ||
2328 | BUILD_BUG_ON(UBIFS_MAX_DENT_NODE_SZ > UBIFS_MAX_NODE_SZ); | |
2329 | BUILD_BUG_ON(UBIFS_MAX_XENT_NODE_SZ > UBIFS_MAX_NODE_SZ); | |
2330 | BUILD_BUG_ON(UBIFS_MAX_DATA_NODE_SZ > UBIFS_MAX_NODE_SZ); | |
2331 | BUILD_BUG_ON(UBIFS_MAX_INO_NODE_SZ > UBIFS_MAX_NODE_SZ); | |
2332 | ||
2333 | /* Defined node sizes */ | |
2334 | BUILD_BUG_ON(UBIFS_SB_NODE_SZ != 4096); | |
2335 | BUILD_BUG_ON(UBIFS_MST_NODE_SZ != 512); | |
2336 | BUILD_BUG_ON(UBIFS_INO_NODE_SZ != 160); | |
2337 | BUILD_BUG_ON(UBIFS_REF_NODE_SZ != 64); | |
2338 | ||
a1dc080c AB |
2339 | /* |
2340 | * We use 2 bit wide bit-fields to store compression type, which should | |
2341 | * be amended if more compressors are added. The bit-fields are: | |
553dea4d AB |
2342 | * @compr_type in 'struct ubifs_inode', @default_compr in |
2343 | * 'struct ubifs_info' and @compr_type in 'struct ubifs_mount_opts'. | |
a1dc080c AB |
2344 | */ |
2345 | BUILD_BUG_ON(UBIFS_COMPR_TYPES_CNT > 4); | |
2346 | ||
1e51764a | 2347 | /* |
ea1754a0 | 2348 | * We require that PAGE_SIZE is greater-than-or-equal-to |
1e51764a AB |
2349 | * UBIFS_BLOCK_SIZE. It is assumed that both are powers of 2. |
2350 | */ | |
09cbfeaf | 2351 | if (PAGE_SIZE < UBIFS_BLOCK_SIZE) { |
235c362b | 2352 | pr_err("UBIFS error (pid %d): VFS page cache size is %u bytes, but UBIFS requires at least 4096 bytes", |
09cbfeaf | 2353 | current->pid, (unsigned int)PAGE_SIZE); |
1e51764a AB |
2354 | return -EINVAL; |
2355 | } | |
2356 | ||
1e51764a AB |
2357 | ubifs_inode_slab = kmem_cache_create("ubifs_inode_slab", |
2358 | sizeof(struct ubifs_inode), 0, | |
5d097056 VD |
2359 | SLAB_MEM_SPREAD | SLAB_RECLAIM_ACCOUNT | |
2360 | SLAB_ACCOUNT, &inode_slab_ctor); | |
1e51764a | 2361 | if (!ubifs_inode_slab) |
5cc361e3 | 2362 | return -ENOMEM; |
1e51764a | 2363 | |
a1fe33af CY |
2364 | err = register_shrinker(&ubifs_shrinker_info); |
2365 | if (err) | |
2366 | goto out_slab; | |
1e51764a AB |
2367 | |
2368 | err = ubifs_compressors_init(); | |
552ff317 AB |
2369 | if (err) |
2370 | goto out_shrinker; | |
2371 | ||
2372 | err = dbg_debugfs_init(); | |
1e51764a AB |
2373 | if (err) |
2374 | goto out_compr; | |
2375 | ||
5cc361e3 AV |
2376 | err = register_filesystem(&ubifs_fs_type); |
2377 | if (err) { | |
235c362b SY |
2378 | pr_err("UBIFS error (pid %d): cannot register file system, error %d", |
2379 | current->pid, err); | |
5cc361e3 AV |
2380 | goto out_dbg; |
2381 | } | |
1e51764a AB |
2382 | return 0; |
2383 | ||
5cc361e3 AV |
2384 | out_dbg: |
2385 | dbg_debugfs_exit(); | |
1e51764a | 2386 | out_compr: |
552ff317 AB |
2387 | ubifs_compressors_exit(); |
2388 | out_shrinker: | |
1e51764a | 2389 | unregister_shrinker(&ubifs_shrinker_info); |
a1fe33af | 2390 | out_slab: |
1e51764a | 2391 | kmem_cache_destroy(ubifs_inode_slab); |
1e51764a AB |
2392 | return err; |
2393 | } | |
2394 | /* late_initcall to let compressors initialize first */ | |
2395 | late_initcall(ubifs_init); | |
2396 | ||
2397 | static void __exit ubifs_exit(void) | |
2398 | { | |
f8ccb14f RW |
2399 | WARN_ON(!list_empty(&ubifs_infos)); |
2400 | WARN_ON(atomic_long_read(&ubifs_clean_zn_cnt) != 0); | |
1e51764a | 2401 | |
552ff317 | 2402 | dbg_debugfs_exit(); |
1e51764a AB |
2403 | ubifs_compressors_exit(); |
2404 | unregister_shrinker(&ubifs_shrinker_info); | |
8c0a8537 KS |
2405 | |
2406 | /* | |
2407 | * Make sure all delayed rcu free inodes are flushed before we | |
2408 | * destroy cache. | |
2409 | */ | |
2410 | rcu_barrier(); | |
1e51764a AB |
2411 | kmem_cache_destroy(ubifs_inode_slab); |
2412 | unregister_filesystem(&ubifs_fs_type); | |
2413 | } | |
2414 | module_exit(ubifs_exit); | |
2415 | ||
2416 | MODULE_LICENSE("GPL"); | |
2417 | MODULE_VERSION(__stringify(UBIFS_VERSION)); | |
2418 | MODULE_AUTHOR("Artem Bityutskiy, Adrian Hunter"); | |
2419 | MODULE_DESCRIPTION("UBIFS - UBI File System"); |