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 AB |
47 | /* Slab cache for UBIFS inodes */ |
48 | struct kmem_cache *ubifs_inode_slab; | |
49 | ||
50 | /* UBIFS TNC shrinker description */ | |
51 | static struct shrinker ubifs_shrinker_info = { | |
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) { | |
73 | ubifs_err("inode is too large (%lld)", | |
74 | (long long)inode->i_size); | |
75 | return 1; | |
76 | } | |
77 | ||
b793a8c8 | 78 | if (ui->compr_type >= UBIFS_COMPR_TYPES_CNT) { |
1e51764a AB |
79 | ubifs_err("unknown compression type %d", ui->compr_type); |
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 | ||
92 | if (!ubifs_compr_present(ui->compr_type)) { | |
79fda517 AB |
93 | ubifs_warn("inode %lu uses '%s' compression, but it was not compiled in", |
94 | inode->i_ino, ubifs_compr_name(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 | ||
131 | inode->i_flags |= (S_NOCMTIME | S_NOATIME); | |
bfe86848 | 132 | set_nlink(inode, le32_to_cpu(ino->nlink)); |
39241beb EB |
133 | i_uid_write(inode, le32_to_cpu(ino->uid)); |
134 | i_gid_write(inode, le32_to_cpu(ino->gid)); | |
1e51764a AB |
135 | inode->i_atime.tv_sec = (int64_t)le64_to_cpu(ino->atime_sec); |
136 | inode->i_atime.tv_nsec = le32_to_cpu(ino->atime_nsec); | |
137 | inode->i_mtime.tv_sec = (int64_t)le64_to_cpu(ino->mtime_sec); | |
138 | inode->i_mtime.tv_nsec = le32_to_cpu(ino->mtime_nsec); | |
139 | inode->i_ctime.tv_sec = (int64_t)le64_to_cpu(ino->ctime_sec); | |
140 | inode->i_ctime.tv_nsec = le32_to_cpu(ino->ctime_nsec); | |
141 | inode->i_mode = le32_to_cpu(ino->mode); | |
142 | inode->i_size = le64_to_cpu(ino->size); | |
143 | ||
144 | ui->data_len = le32_to_cpu(ino->data_len); | |
145 | ui->flags = le32_to_cpu(ino->flags); | |
146 | ui->compr_type = le16_to_cpu(ino->compr_type); | |
147 | ui->creat_sqnum = le64_to_cpu(ino->creat_sqnum); | |
148 | ui->xattr_cnt = le32_to_cpu(ino->xattr_cnt); | |
149 | ui->xattr_size = le32_to_cpu(ino->xattr_size); | |
150 | ui->xattr_names = le32_to_cpu(ino->xattr_names); | |
151 | ui->synced_i_size = ui->ui_size = inode->i_size; | |
152 | ||
153 | ui->xattr = (ui->flags & UBIFS_XATTR_FL) ? 1 : 0; | |
154 | ||
155 | err = validate_inode(c, inode); | |
156 | if (err) | |
157 | goto out_invalid; | |
158 | ||
1e51764a AB |
159 | switch (inode->i_mode & S_IFMT) { |
160 | case S_IFREG: | |
161 | inode->i_mapping->a_ops = &ubifs_file_address_operations; | |
162 | inode->i_op = &ubifs_file_inode_operations; | |
163 | inode->i_fop = &ubifs_file_operations; | |
164 | if (ui->xattr) { | |
165 | ui->data = kmalloc(ui->data_len + 1, GFP_NOFS); | |
166 | if (!ui->data) { | |
167 | err = -ENOMEM; | |
168 | goto out_ino; | |
169 | } | |
170 | memcpy(ui->data, ino->data, ui->data_len); | |
171 | ((char *)ui->data)[ui->data_len] = '\0'; | |
172 | } else if (ui->data_len != 0) { | |
173 | err = 10; | |
174 | goto out_invalid; | |
175 | } | |
176 | break; | |
177 | case S_IFDIR: | |
178 | inode->i_op = &ubifs_dir_inode_operations; | |
179 | inode->i_fop = &ubifs_dir_operations; | |
180 | if (ui->data_len != 0) { | |
181 | err = 11; | |
182 | goto out_invalid; | |
183 | } | |
184 | break; | |
185 | case S_IFLNK: | |
186 | inode->i_op = &ubifs_symlink_inode_operations; | |
187 | if (ui->data_len <= 0 || ui->data_len > UBIFS_MAX_INO_DATA) { | |
188 | err = 12; | |
189 | goto out_invalid; | |
190 | } | |
191 | ui->data = kmalloc(ui->data_len + 1, GFP_NOFS); | |
192 | if (!ui->data) { | |
193 | err = -ENOMEM; | |
194 | goto out_ino; | |
195 | } | |
196 | memcpy(ui->data, ino->data, ui->data_len); | |
197 | ((char *)ui->data)[ui->data_len] = '\0'; | |
198 | break; | |
199 | case S_IFBLK: | |
200 | case S_IFCHR: | |
201 | { | |
202 | dev_t rdev; | |
203 | union ubifs_dev_desc *dev; | |
204 | ||
205 | ui->data = kmalloc(sizeof(union ubifs_dev_desc), GFP_NOFS); | |
206 | if (!ui->data) { | |
207 | err = -ENOMEM; | |
208 | goto out_ino; | |
209 | } | |
210 | ||
211 | dev = (union ubifs_dev_desc *)ino->data; | |
212 | if (ui->data_len == sizeof(dev->new)) | |
213 | rdev = new_decode_dev(le32_to_cpu(dev->new)); | |
214 | else if (ui->data_len == sizeof(dev->huge)) | |
215 | rdev = huge_decode_dev(le64_to_cpu(dev->huge)); | |
216 | else { | |
217 | err = 13; | |
218 | goto out_invalid; | |
219 | } | |
220 | memcpy(ui->data, ino->data, ui->data_len); | |
221 | inode->i_op = &ubifs_file_inode_operations; | |
222 | init_special_inode(inode, inode->i_mode, rdev); | |
223 | break; | |
224 | } | |
225 | case S_IFSOCK: | |
226 | case S_IFIFO: | |
227 | inode->i_op = &ubifs_file_inode_operations; | |
228 | init_special_inode(inode, inode->i_mode, 0); | |
229 | if (ui->data_len != 0) { | |
230 | err = 14; | |
231 | goto out_invalid; | |
232 | } | |
233 | break; | |
234 | default: | |
235 | err = 15; | |
236 | goto out_invalid; | |
237 | } | |
238 | ||
239 | kfree(ino); | |
240 | ubifs_set_inode_flags(inode); | |
241 | unlock_new_inode(inode); | |
242 | return inode; | |
243 | ||
244 | out_invalid: | |
245 | ubifs_err("inode %lu validation failed, error %d", inode->i_ino, err); | |
edf6be24 AB |
246 | ubifs_dump_node(c, ino); |
247 | ubifs_dump_inode(c, inode); | |
1e51764a AB |
248 | err = -EINVAL; |
249 | out_ino: | |
250 | kfree(ino); | |
251 | out: | |
252 | ubifs_err("failed to read inode %lu, error %d", inode->i_ino, err); | |
253 | iget_failed(inode); | |
254 | return ERR_PTR(err); | |
255 | } | |
256 | ||
257 | static struct inode *ubifs_alloc_inode(struct super_block *sb) | |
258 | { | |
259 | struct ubifs_inode *ui; | |
260 | ||
261 | ui = kmem_cache_alloc(ubifs_inode_slab, GFP_NOFS); | |
262 | if (!ui) | |
263 | return NULL; | |
264 | ||
265 | memset((void *)ui + sizeof(struct inode), 0, | |
266 | sizeof(struct ubifs_inode) - sizeof(struct inode)); | |
267 | mutex_init(&ui->ui_mutex); | |
268 | spin_lock_init(&ui->ui_lock); | |
269 | return &ui->vfs_inode; | |
270 | }; | |
271 | ||
fa0d7e3d NP |
272 | static void ubifs_i_callback(struct rcu_head *head) |
273 | { | |
274 | struct inode *inode = container_of(head, struct inode, i_rcu); | |
275 | struct ubifs_inode *ui = ubifs_inode(inode); | |
fa0d7e3d NP |
276 | kmem_cache_free(ubifs_inode_slab, ui); |
277 | } | |
278 | ||
1e51764a AB |
279 | static void ubifs_destroy_inode(struct inode *inode) |
280 | { | |
281 | struct ubifs_inode *ui = ubifs_inode(inode); | |
282 | ||
283 | kfree(ui->data); | |
fa0d7e3d | 284 | call_rcu(&inode->i_rcu, ubifs_i_callback); |
1e51764a AB |
285 | } |
286 | ||
287 | /* | |
288 | * Note, Linux write-back code calls this without 'i_mutex'. | |
289 | */ | |
a9185b41 | 290 | static int ubifs_write_inode(struct inode *inode, struct writeback_control *wbc) |
1e51764a | 291 | { |
fbfa6c88 | 292 | int err = 0; |
1e51764a AB |
293 | struct ubifs_info *c = inode->i_sb->s_fs_info; |
294 | struct ubifs_inode *ui = ubifs_inode(inode); | |
295 | ||
296 | ubifs_assert(!ui->xattr); | |
297 | if (is_bad_inode(inode)) | |
298 | return 0; | |
299 | ||
300 | mutex_lock(&ui->ui_mutex); | |
301 | /* | |
302 | * Due to races between write-back forced by budgeting | |
5c57f20b | 303 | * (see 'sync_some_inodes()') and background write-back, the inode may |
1e51764a AB |
304 | * have already been synchronized, do not do this again. This might |
305 | * also happen if it was synchronized in an VFS operation, e.g. | |
306 | * 'ubifs_link()'. | |
307 | */ | |
308 | if (!ui->dirty) { | |
309 | mutex_unlock(&ui->ui_mutex); | |
310 | return 0; | |
311 | } | |
312 | ||
fbfa6c88 AB |
313 | /* |
314 | * As an optimization, do not write orphan inodes to the media just | |
315 | * because this is not needed. | |
316 | */ | |
317 | dbg_gen("inode %lu, mode %#x, nlink %u", | |
318 | inode->i_ino, (int)inode->i_mode, inode->i_nlink); | |
319 | if (inode->i_nlink) { | |
1f28681a | 320 | err = ubifs_jnl_write_inode(c, inode); |
fbfa6c88 AB |
321 | if (err) |
322 | ubifs_err("can't write inode %lu, error %d", | |
323 | inode->i_ino, err); | |
e3c3efc2 AB |
324 | else |
325 | err = dbg_check_inode_size(c, inode, ui->ui_size); | |
fbfa6c88 | 326 | } |
1e51764a AB |
327 | |
328 | ui->dirty = 0; | |
329 | mutex_unlock(&ui->ui_mutex); | |
330 | ubifs_release_dirty_inode_budget(c, ui); | |
331 | return err; | |
332 | } | |
333 | ||
d640e1b5 | 334 | static void ubifs_evict_inode(struct inode *inode) |
1e51764a AB |
335 | { |
336 | int err; | |
337 | struct ubifs_info *c = inode->i_sb->s_fs_info; | |
1e0f358e | 338 | struct ubifs_inode *ui = ubifs_inode(inode); |
1e51764a | 339 | |
1e0f358e | 340 | if (ui->xattr) |
1e51764a AB |
341 | /* |
342 | * Extended attribute inode deletions are fully handled in | |
343 | * 'ubifs_removexattr()'. These inodes are special and have | |
344 | * limited usage, so there is nothing to do here. | |
345 | */ | |
346 | goto out; | |
347 | ||
7d32c2bb | 348 | dbg_gen("inode %lu, mode %#x", inode->i_ino, (int)inode->i_mode); |
1e51764a | 349 | ubifs_assert(!atomic_read(&inode->i_count)); |
1e51764a | 350 | |
91b0abe3 | 351 | truncate_inode_pages_final(&inode->i_data); |
d640e1b5 AV |
352 | |
353 | if (inode->i_nlink) | |
354 | goto done; | |
355 | ||
1e51764a AB |
356 | if (is_bad_inode(inode)) |
357 | goto out; | |
358 | ||
1e0f358e | 359 | ui->ui_size = inode->i_size = 0; |
de94eb55 | 360 | err = ubifs_jnl_delete_inode(c, inode); |
1e51764a AB |
361 | if (err) |
362 | /* | |
363 | * Worst case we have a lost orphan inode wasting space, so a | |
0a883a05 | 364 | * simple error message is OK here. |
1e51764a | 365 | */ |
de94eb55 AB |
366 | ubifs_err("can't delete inode %lu, error %d", |
367 | inode->i_ino, err); | |
368 | ||
1e51764a | 369 | out: |
1e0f358e AB |
370 | if (ui->dirty) |
371 | ubifs_release_dirty_inode_budget(c, ui); | |
6d6cb0d6 AH |
372 | else { |
373 | /* We've deleted something - clean the "no space" flags */ | |
b137545c | 374 | c->bi.nospace = c->bi.nospace_rp = 0; |
6d6cb0d6 AH |
375 | smp_wmb(); |
376 | } | |
d640e1b5 | 377 | done: |
dbd5768f | 378 | clear_inode(inode); |
1e51764a AB |
379 | } |
380 | ||
aa385729 | 381 | static void ubifs_dirty_inode(struct inode *inode, int flags) |
1e51764a AB |
382 | { |
383 | struct ubifs_inode *ui = ubifs_inode(inode); | |
384 | ||
385 | ubifs_assert(mutex_is_locked(&ui->ui_mutex)); | |
386 | if (!ui->dirty) { | |
387 | ui->dirty = 1; | |
388 | dbg_gen("inode %lu", inode->i_ino); | |
389 | } | |
390 | } | |
391 | ||
392 | static int ubifs_statfs(struct dentry *dentry, struct kstatfs *buf) | |
393 | { | |
394 | struct ubifs_info *c = dentry->d_sb->s_fs_info; | |
395 | unsigned long long free; | |
7c7cbadf | 396 | __le32 *uuid = (__le32 *)c->uuid; |
1e51764a | 397 | |
7dad181b | 398 | free = ubifs_get_free_space(c); |
1e51764a AB |
399 | dbg_gen("free space %lld bytes (%lld blocks)", |
400 | free, free >> UBIFS_BLOCK_SHIFT); | |
401 | ||
402 | buf->f_type = UBIFS_SUPER_MAGIC; | |
403 | buf->f_bsize = UBIFS_BLOCK_SIZE; | |
404 | buf->f_blocks = c->block_cnt; | |
405 | buf->f_bfree = free >> UBIFS_BLOCK_SHIFT; | |
406 | if (free > c->report_rp_size) | |
407 | buf->f_bavail = (free - c->report_rp_size) >> UBIFS_BLOCK_SHIFT; | |
408 | else | |
409 | buf->f_bavail = 0; | |
410 | buf->f_files = 0; | |
411 | buf->f_ffree = 0; | |
412 | buf->f_namelen = UBIFS_MAX_NLEN; | |
7c7cbadf AB |
413 | buf->f_fsid.val[0] = le32_to_cpu(uuid[0]) ^ le32_to_cpu(uuid[2]); |
414 | buf->f_fsid.val[1] = le32_to_cpu(uuid[1]) ^ le32_to_cpu(uuid[3]); | |
b4978e94 | 415 | ubifs_assert(buf->f_bfree <= c->block_cnt); |
1e51764a AB |
416 | return 0; |
417 | } | |
418 | ||
34c80b1d | 419 | static int ubifs_show_options(struct seq_file *s, struct dentry *root) |
1e51764a | 420 | { |
34c80b1d | 421 | struct ubifs_info *c = root->d_sb->s_fs_info; |
1e51764a AB |
422 | |
423 | if (c->mount_opts.unmount_mode == 2) | |
d4eb08ff | 424 | seq_puts(s, ",fast_unmount"); |
1e51764a | 425 | else if (c->mount_opts.unmount_mode == 1) |
d4eb08ff | 426 | seq_puts(s, ",norm_unmount"); |
1e51764a | 427 | |
4793e7c5 | 428 | if (c->mount_opts.bulk_read == 2) |
d4eb08ff | 429 | seq_puts(s, ",bulk_read"); |
4793e7c5 | 430 | else if (c->mount_opts.bulk_read == 1) |
d4eb08ff | 431 | seq_puts(s, ",no_bulk_read"); |
4793e7c5 | 432 | |
2953e73f | 433 | if (c->mount_opts.chk_data_crc == 2) |
d4eb08ff | 434 | seq_puts(s, ",chk_data_crc"); |
2953e73f | 435 | else if (c->mount_opts.chk_data_crc == 1) |
d4eb08ff | 436 | seq_puts(s, ",no_chk_data_crc"); |
2953e73f | 437 | |
553dea4d | 438 | if (c->mount_opts.override_compr) { |
fcabb347 HA |
439 | seq_printf(s, ",compr=%s", |
440 | ubifs_compr_name(c->mount_opts.compr_type)); | |
553dea4d AB |
441 | } |
442 | ||
1e51764a AB |
443 | return 0; |
444 | } | |
445 | ||
446 | static int ubifs_sync_fs(struct super_block *sb, int wait) | |
447 | { | |
f1038300 | 448 | int i, err; |
1e51764a | 449 | struct ubifs_info *c = sb->s_fs_info; |
304d427c | 450 | |
e8ea1759 | 451 | /* |
dedb0d48 AB |
452 | * Zero @wait is just an advisory thing to help the file system shove |
453 | * lots of data into the queues, and there will be the second | |
e8ea1759 AB |
454 | * '->sync_fs()' call, with non-zero @wait. |
455 | */ | |
dedb0d48 AB |
456 | if (!wait) |
457 | return 0; | |
e8ea1759 | 458 | |
3eb14297 AH |
459 | /* |
460 | * Synchronize write buffers, because 'ubifs_run_commit()' does not | |
461 | * do this if it waits for an already running commit. | |
462 | */ | |
463 | for (i = 0; i < c->jhead_cnt; i++) { | |
464 | err = ubifs_wbuf_sync(&c->jheads[i].wbuf); | |
465 | if (err) | |
466 | return err; | |
467 | } | |
468 | ||
887ee171 AB |
469 | /* |
470 | * Strictly speaking, it is not necessary to commit the journal here, | |
471 | * synchronizing write-buffers would be enough. But committing makes | |
472 | * UBIFS free space predictions much more accurate, so we want to let | |
473 | * the user be able to get more accurate results of 'statfs()' after | |
474 | * they synchronize the file system. | |
475 | */ | |
f1038300 AB |
476 | err = ubifs_run_commit(c); |
477 | if (err) | |
478 | return err; | |
403e12ab | 479 | |
cb5c6a2b | 480 | return ubi_sync(c->vi.ubi_num); |
1e51764a AB |
481 | } |
482 | ||
483 | /** | |
484 | * init_constants_early - initialize UBIFS constants. | |
485 | * @c: UBIFS file-system description object | |
486 | * | |
487 | * This function initialize UBIFS constants which do not need the superblock to | |
488 | * be read. It also checks that the UBI volume satisfies basic UBIFS | |
489 | * requirements. Returns zero in case of success and a negative error code in | |
490 | * case of failure. | |
491 | */ | |
492 | static int init_constants_early(struct ubifs_info *c) | |
493 | { | |
494 | if (c->vi.corrupted) { | |
495 | ubifs_warn("UBI volume is corrupted - read-only mode"); | |
496 | c->ro_media = 1; | |
497 | } | |
498 | ||
499 | if (c->di.ro_mode) { | |
500 | ubifs_msg("read-only UBI device"); | |
501 | c->ro_media = 1; | |
502 | } | |
503 | ||
504 | if (c->vi.vol_type == UBI_STATIC_VOLUME) { | |
505 | ubifs_msg("static UBI volume - read-only mode"); | |
506 | c->ro_media = 1; | |
507 | } | |
508 | ||
509 | c->leb_cnt = c->vi.size; | |
510 | c->leb_size = c->vi.usable_leb_size; | |
ca2ec61d | 511 | c->leb_start = c->di.leb_start; |
1e51764a AB |
512 | c->half_leb_size = c->leb_size / 2; |
513 | c->min_io_size = c->di.min_io_size; | |
514 | c->min_io_shift = fls(c->min_io_size) - 1; | |
3e8e2e0c AB |
515 | c->max_write_size = c->di.max_write_size; |
516 | c->max_write_shift = fls(c->max_write_size) - 1; | |
1e51764a AB |
517 | |
518 | if (c->leb_size < UBIFS_MIN_LEB_SZ) { | |
519 | ubifs_err("too small LEBs (%d bytes), min. is %d bytes", | |
520 | c->leb_size, UBIFS_MIN_LEB_SZ); | |
521 | return -EINVAL; | |
522 | } | |
523 | ||
524 | if (c->leb_cnt < UBIFS_MIN_LEB_CNT) { | |
525 | ubifs_err("too few LEBs (%d), min. is %d", | |
526 | c->leb_cnt, UBIFS_MIN_LEB_CNT); | |
527 | return -EINVAL; | |
528 | } | |
529 | ||
530 | if (!is_power_of_2(c->min_io_size)) { | |
531 | ubifs_err("bad min. I/O size %d", c->min_io_size); | |
532 | return -EINVAL; | |
533 | } | |
534 | ||
3e8e2e0c AB |
535 | /* |
536 | * Maximum write size has to be greater or equivalent to min. I/O | |
537 | * size, and be multiple of min. I/O size. | |
538 | */ | |
539 | if (c->max_write_size < c->min_io_size || | |
540 | c->max_write_size % c->min_io_size || | |
541 | !is_power_of_2(c->max_write_size)) { | |
542 | ubifs_err("bad write buffer size %d for %d min. I/O unit", | |
543 | c->max_write_size, c->min_io_size); | |
544 | return -EINVAL; | |
545 | } | |
546 | ||
1e51764a AB |
547 | /* |
548 | * UBIFS aligns all node to 8-byte boundary, so to make function in | |
549 | * io.c simpler, assume minimum I/O unit size to be 8 bytes if it is | |
550 | * less than 8. | |
551 | */ | |
552 | if (c->min_io_size < 8) { | |
553 | c->min_io_size = 8; | |
554 | c->min_io_shift = 3; | |
3e8e2e0c AB |
555 | if (c->max_write_size < c->min_io_size) { |
556 | c->max_write_size = c->min_io_size; | |
557 | c->max_write_shift = c->min_io_shift; | |
558 | } | |
1e51764a AB |
559 | } |
560 | ||
561 | c->ref_node_alsz = ALIGN(UBIFS_REF_NODE_SZ, c->min_io_size); | |
562 | c->mst_node_alsz = ALIGN(UBIFS_MST_NODE_SZ, c->min_io_size); | |
563 | ||
564 | /* | |
565 | * Initialize node length ranges which are mostly needed for node | |
566 | * length validation. | |
567 | */ | |
568 | c->ranges[UBIFS_PAD_NODE].len = UBIFS_PAD_NODE_SZ; | |
569 | c->ranges[UBIFS_SB_NODE].len = UBIFS_SB_NODE_SZ; | |
570 | c->ranges[UBIFS_MST_NODE].len = UBIFS_MST_NODE_SZ; | |
571 | c->ranges[UBIFS_REF_NODE].len = UBIFS_REF_NODE_SZ; | |
572 | c->ranges[UBIFS_TRUN_NODE].len = UBIFS_TRUN_NODE_SZ; | |
573 | c->ranges[UBIFS_CS_NODE].len = UBIFS_CS_NODE_SZ; | |
574 | ||
575 | c->ranges[UBIFS_INO_NODE].min_len = UBIFS_INO_NODE_SZ; | |
576 | c->ranges[UBIFS_INO_NODE].max_len = UBIFS_MAX_INO_NODE_SZ; | |
577 | c->ranges[UBIFS_ORPH_NODE].min_len = | |
578 | UBIFS_ORPH_NODE_SZ + sizeof(__le64); | |
579 | c->ranges[UBIFS_ORPH_NODE].max_len = c->leb_size; | |
580 | c->ranges[UBIFS_DENT_NODE].min_len = UBIFS_DENT_NODE_SZ; | |
581 | c->ranges[UBIFS_DENT_NODE].max_len = UBIFS_MAX_DENT_NODE_SZ; | |
582 | c->ranges[UBIFS_XENT_NODE].min_len = UBIFS_XENT_NODE_SZ; | |
583 | c->ranges[UBIFS_XENT_NODE].max_len = UBIFS_MAX_XENT_NODE_SZ; | |
584 | c->ranges[UBIFS_DATA_NODE].min_len = UBIFS_DATA_NODE_SZ; | |
585 | c->ranges[UBIFS_DATA_NODE].max_len = UBIFS_MAX_DATA_NODE_SZ; | |
586 | /* | |
587 | * Minimum indexing node size is amended later when superblock is | |
588 | * read and the key length is known. | |
589 | */ | |
590 | c->ranges[UBIFS_IDX_NODE].min_len = UBIFS_IDX_NODE_SZ + UBIFS_BRANCH_SZ; | |
591 | /* | |
592 | * Maximum indexing node size is amended later when superblock is | |
593 | * read and the fanout is known. | |
594 | */ | |
595 | c->ranges[UBIFS_IDX_NODE].max_len = INT_MAX; | |
596 | ||
597 | /* | |
7078202e AB |
598 | * Initialize dead and dark LEB space watermarks. See gc.c for comments |
599 | * about these values. | |
1e51764a AB |
600 | */ |
601 | c->dead_wm = ALIGN(MIN_WRITE_SZ, c->min_io_size); | |
602 | c->dark_wm = ALIGN(UBIFS_MAX_NODE_SZ, c->min_io_size); | |
603 | ||
9bbb5726 AB |
604 | /* |
605 | * Calculate how many bytes would be wasted at the end of LEB if it was | |
606 | * fully filled with data nodes of maximum size. This is used in | |
607 | * calculations when reporting free space. | |
608 | */ | |
609 | c->leb_overhead = c->leb_size % UBIFS_MAX_DATA_NODE_SZ; | |
39ce81ce | 610 | |
4793e7c5 | 611 | /* Buffer size for bulk-reads */ |
6c0c42cd AB |
612 | c->max_bu_buf_len = UBIFS_MAX_BULK_READ * UBIFS_MAX_DATA_NODE_SZ; |
613 | if (c->max_bu_buf_len > c->leb_size) | |
614 | c->max_bu_buf_len = c->leb_size; | |
1e51764a AB |
615 | return 0; |
616 | } | |
617 | ||
618 | /** | |
619 | * bud_wbuf_callback - bud LEB write-buffer synchronization call-back. | |
620 | * @c: UBIFS file-system description object | |
621 | * @lnum: LEB the write-buffer was synchronized to | |
622 | * @free: how many free bytes left in this LEB | |
623 | * @pad: how many bytes were padded | |
624 | * | |
625 | * This is a callback function which is called by the I/O unit when the | |
626 | * write-buffer is synchronized. We need this to correctly maintain space | |
627 | * accounting in bud logical eraseblocks. This function returns zero in case of | |
628 | * success and a negative error code in case of failure. | |
629 | * | |
630 | * This function actually belongs to the journal, but we keep it here because | |
631 | * we want to keep it static. | |
632 | */ | |
633 | static int bud_wbuf_callback(struct ubifs_info *c, int lnum, int free, int pad) | |
634 | { | |
635 | return ubifs_update_one_lp(c, lnum, free, pad, 0, 0); | |
636 | } | |
637 | ||
638 | /* | |
79807d07 | 639 | * init_constants_sb - initialize UBIFS constants. |
1e51764a AB |
640 | * @c: UBIFS file-system description object |
641 | * | |
642 | * This is a helper function which initializes various UBIFS constants after | |
643 | * the superblock has been read. It also checks various UBIFS parameters and | |
644 | * makes sure they are all right. Returns zero in case of success and a | |
645 | * negative error code in case of failure. | |
646 | */ | |
79807d07 | 647 | static int init_constants_sb(struct ubifs_info *c) |
1e51764a AB |
648 | { |
649 | int tmp, err; | |
4d61db4f | 650 | long long tmp64; |
1e51764a AB |
651 | |
652 | c->main_bytes = (long long)c->main_lebs * c->leb_size; | |
653 | c->max_znode_sz = sizeof(struct ubifs_znode) + | |
654 | c->fanout * sizeof(struct ubifs_zbranch); | |
655 | ||
656 | tmp = ubifs_idx_node_sz(c, 1); | |
657 | c->ranges[UBIFS_IDX_NODE].min_len = tmp; | |
658 | c->min_idx_node_sz = ALIGN(tmp, 8); | |
659 | ||
660 | tmp = ubifs_idx_node_sz(c, c->fanout); | |
661 | c->ranges[UBIFS_IDX_NODE].max_len = tmp; | |
662 | c->max_idx_node_sz = ALIGN(tmp, 8); | |
663 | ||
664 | /* Make sure LEB size is large enough to fit full commit */ | |
665 | tmp = UBIFS_CS_NODE_SZ + UBIFS_REF_NODE_SZ * c->jhead_cnt; | |
666 | tmp = ALIGN(tmp, c->min_io_size); | |
667 | if (tmp > c->leb_size) { | |
a6aae4dd AB |
668 | ubifs_err("too small LEB size %d, at least %d needed", |
669 | c->leb_size, tmp); | |
1e51764a AB |
670 | return -EINVAL; |
671 | } | |
672 | ||
673 | /* | |
674 | * Make sure that the log is large enough to fit reference nodes for | |
675 | * all buds plus one reserved LEB. | |
676 | */ | |
4d61db4f AB |
677 | tmp64 = c->max_bud_bytes + c->leb_size - 1; |
678 | c->max_bud_cnt = div_u64(tmp64, c->leb_size); | |
1e51764a AB |
679 | tmp = (c->ref_node_alsz * c->max_bud_cnt + c->leb_size - 1); |
680 | tmp /= c->leb_size; | |
681 | tmp += 1; | |
682 | if (c->log_lebs < tmp) { | |
a6aae4dd AB |
683 | ubifs_err("too small log %d LEBs, required min. %d LEBs", |
684 | c->log_lebs, tmp); | |
1e51764a AB |
685 | return -EINVAL; |
686 | } | |
687 | ||
688 | /* | |
689 | * When budgeting we assume worst-case scenarios when the pages are not | |
690 | * be compressed and direntries are of the maximum size. | |
691 | * | |
692 | * Note, data, which may be stored in inodes is budgeted separately, so | |
b137545c | 693 | * it is not included into 'c->bi.inode_budget'. |
1e51764a | 694 | */ |
b137545c AB |
695 | c->bi.page_budget = UBIFS_MAX_DATA_NODE_SZ * UBIFS_BLOCKS_PER_PAGE; |
696 | c->bi.inode_budget = UBIFS_INO_NODE_SZ; | |
697 | c->bi.dent_budget = UBIFS_MAX_DENT_NODE_SZ; | |
1e51764a AB |
698 | |
699 | /* | |
700 | * When the amount of flash space used by buds becomes | |
701 | * 'c->max_bud_bytes', UBIFS just blocks all writers and starts commit. | |
702 | * The writers are unblocked when the commit is finished. To avoid | |
703 | * writers to be blocked UBIFS initiates background commit in advance, | |
704 | * when number of bud bytes becomes above the limit defined below. | |
705 | */ | |
706 | c->bg_bud_bytes = (c->max_bud_bytes * 13) >> 4; | |
707 | ||
708 | /* | |
709 | * Ensure minimum journal size. All the bytes in the journal heads are | |
710 | * considered to be used, when calculating the current journal usage. | |
711 | * Consequently, if the journal is too small, UBIFS will treat it as | |
712 | * always full. | |
713 | */ | |
4d61db4f | 714 | tmp64 = (long long)(c->jhead_cnt + 1) * c->leb_size + 1; |
1e51764a AB |
715 | if (c->bg_bud_bytes < tmp64) |
716 | c->bg_bud_bytes = tmp64; | |
717 | if (c->max_bud_bytes < tmp64 + c->leb_size) | |
718 | c->max_bud_bytes = tmp64 + c->leb_size; | |
719 | ||
720 | err = ubifs_calc_lpt_geom(c); | |
721 | if (err) | |
722 | return err; | |
723 | ||
fb1cd01a AB |
724 | /* Initialize effective LEB size used in budgeting calculations */ |
725 | c->idx_leb_size = c->leb_size - c->max_idx_node_sz; | |
79807d07 AB |
726 | return 0; |
727 | } | |
728 | ||
729 | /* | |
730 | * init_constants_master - initialize UBIFS constants. | |
731 | * @c: UBIFS file-system description object | |
732 | * | |
733 | * This is a helper function which initializes various UBIFS constants after | |
734 | * the master node has been read. It also checks various UBIFS parameters and | |
735 | * makes sure they are all right. | |
736 | */ | |
737 | static void init_constants_master(struct ubifs_info *c) | |
738 | { | |
739 | long long tmp64; | |
740 | ||
b137545c | 741 | c->bi.min_idx_lebs = ubifs_calc_min_idx_lebs(c); |
fb1cd01a | 742 | c->report_rp_size = ubifs_reported_space(c, c->rp_size); |
1e51764a AB |
743 | |
744 | /* | |
745 | * Calculate total amount of FS blocks. This number is not used | |
746 | * internally because it does not make much sense for UBIFS, but it is | |
747 | * necessary to report something for the 'statfs()' call. | |
748 | * | |
7dad181b | 749 | * Subtract the LEB reserved for GC, the LEB which is reserved for |
af14a1ad AB |
750 | * deletions, minimum LEBs for the index, and assume only one journal |
751 | * head is available. | |
1e51764a | 752 | */ |
af14a1ad | 753 | tmp64 = c->main_lebs - 1 - 1 - MIN_INDEX_LEBS - c->jhead_cnt + 1; |
4d61db4f | 754 | tmp64 *= (long long)c->leb_size - c->leb_overhead; |
1e51764a AB |
755 | tmp64 = ubifs_reported_space(c, tmp64); |
756 | c->block_cnt = tmp64 >> UBIFS_BLOCK_SHIFT; | |
1e51764a AB |
757 | } |
758 | ||
759 | /** | |
760 | * take_gc_lnum - reserve GC LEB. | |
761 | * @c: UBIFS file-system description object | |
762 | * | |
b4978e94 AB |
763 | * This function ensures that the LEB reserved for garbage collection is marked |
764 | * as "taken" in lprops. We also have to set free space to LEB size and dirty | |
765 | * space to zero, because lprops may contain out-of-date information if the | |
766 | * file-system was un-mounted before it has been committed. This function | |
767 | * returns zero in case of success and a negative error code in case of | |
768 | * failure. | |
1e51764a AB |
769 | */ |
770 | static int take_gc_lnum(struct ubifs_info *c) | |
771 | { | |
772 | int err; | |
773 | ||
774 | if (c->gc_lnum == -1) { | |
775 | ubifs_err("no LEB for GC"); | |
776 | return -EINVAL; | |
777 | } | |
778 | ||
1e51764a AB |
779 | /* And we have to tell lprops that this LEB is taken */ |
780 | err = ubifs_change_one_lp(c, c->gc_lnum, c->leb_size, 0, | |
781 | LPROPS_TAKEN, 0, 0); | |
782 | return err; | |
783 | } | |
784 | ||
785 | /** | |
786 | * alloc_wbufs - allocate write-buffers. | |
787 | * @c: UBIFS file-system description object | |
788 | * | |
789 | * This helper function allocates and initializes UBIFS write-buffers. Returns | |
790 | * zero in case of success and %-ENOMEM in case of failure. | |
791 | */ | |
792 | static int alloc_wbufs(struct ubifs_info *c) | |
793 | { | |
794 | int i, err; | |
795 | ||
86b4c14d FF |
796 | c->jheads = kcalloc(c->jhead_cnt, sizeof(struct ubifs_jhead), |
797 | GFP_KERNEL); | |
1e51764a AB |
798 | if (!c->jheads) |
799 | return -ENOMEM; | |
800 | ||
801 | /* Initialize journal heads */ | |
802 | for (i = 0; i < c->jhead_cnt; i++) { | |
803 | INIT_LIST_HEAD(&c->jheads[i].buds_list); | |
804 | err = ubifs_wbuf_init(c, &c->jheads[i].wbuf); | |
805 | if (err) | |
806 | return err; | |
807 | ||
808 | c->jheads[i].wbuf.sync_callback = &bud_wbuf_callback; | |
809 | c->jheads[i].wbuf.jhead = i; | |
1a0b0699 | 810 | c->jheads[i].grouped = 1; |
1e51764a AB |
811 | } |
812 | ||
1e51764a | 813 | /* |
44156267 AB |
814 | * Garbage Collector head does not need to be synchronized by timer. |
815 | * Also GC head nodes are not grouped. | |
1e51764a | 816 | */ |
0b335b9d | 817 | c->jheads[GCHD].wbuf.no_timer = 1; |
1a0b0699 | 818 | c->jheads[GCHD].grouped = 0; |
1e51764a AB |
819 | |
820 | return 0; | |
821 | } | |
822 | ||
823 | /** | |
824 | * free_wbufs - free write-buffers. | |
825 | * @c: UBIFS file-system description object | |
826 | */ | |
827 | static void free_wbufs(struct ubifs_info *c) | |
828 | { | |
829 | int i; | |
830 | ||
831 | if (c->jheads) { | |
832 | for (i = 0; i < c->jhead_cnt; i++) { | |
833 | kfree(c->jheads[i].wbuf.buf); | |
834 | kfree(c->jheads[i].wbuf.inodes); | |
835 | } | |
836 | kfree(c->jheads); | |
837 | c->jheads = NULL; | |
838 | } | |
839 | } | |
840 | ||
841 | /** | |
842 | * free_orphans - free orphans. | |
843 | * @c: UBIFS file-system description object | |
844 | */ | |
845 | static void free_orphans(struct ubifs_info *c) | |
846 | { | |
847 | struct ubifs_orphan *orph; | |
848 | ||
849 | while (c->orph_dnext) { | |
850 | orph = c->orph_dnext; | |
851 | c->orph_dnext = orph->dnext; | |
852 | list_del(&orph->list); | |
853 | kfree(orph); | |
854 | } | |
855 | ||
856 | while (!list_empty(&c->orph_list)) { | |
857 | orph = list_entry(c->orph_list.next, struct ubifs_orphan, list); | |
858 | list_del(&orph->list); | |
859 | kfree(orph); | |
a6aae4dd | 860 | ubifs_err("orphan list not empty at unmount"); |
1e51764a AB |
861 | } |
862 | ||
863 | vfree(c->orph_buf); | |
864 | c->orph_buf = NULL; | |
865 | } | |
866 | ||
867 | /** | |
868 | * free_buds - free per-bud objects. | |
869 | * @c: UBIFS file-system description object | |
870 | */ | |
871 | static void free_buds(struct ubifs_info *c) | |
872 | { | |
bb25e49f CS |
873 | struct ubifs_bud *bud, *n; |
874 | ||
875 | rbtree_postorder_for_each_entry_safe(bud, n, &c->buds, rb) | |
876 | kfree(bud); | |
1e51764a AB |
877 | } |
878 | ||
879 | /** | |
880 | * check_volume_empty - check if the UBI volume is empty. | |
881 | * @c: UBIFS file-system description object | |
882 | * | |
883 | * This function checks if the UBIFS volume is empty by looking if its LEBs are | |
884 | * mapped or not. The result of checking is stored in the @c->empty variable. | |
885 | * Returns zero in case of success and a negative error code in case of | |
886 | * failure. | |
887 | */ | |
888 | static int check_volume_empty(struct ubifs_info *c) | |
889 | { | |
890 | int lnum, err; | |
891 | ||
892 | c->empty = 1; | |
893 | for (lnum = 0; lnum < c->leb_cnt; lnum++) { | |
d3b2578f | 894 | err = ubifs_is_mapped(c, lnum); |
1e51764a AB |
895 | if (unlikely(err < 0)) |
896 | return err; | |
897 | if (err == 1) { | |
898 | c->empty = 0; | |
899 | break; | |
900 | } | |
901 | ||
902 | cond_resched(); | |
903 | } | |
904 | ||
905 | return 0; | |
906 | } | |
907 | ||
908 | /* | |
909 | * UBIFS mount options. | |
910 | * | |
911 | * Opt_fast_unmount: do not run a journal commit before un-mounting | |
912 | * Opt_norm_unmount: run a journal commit before un-mounting | |
4793e7c5 AH |
913 | * Opt_bulk_read: enable bulk-reads |
914 | * Opt_no_bulk_read: disable bulk-reads | |
2953e73f AH |
915 | * Opt_chk_data_crc: check CRCs when reading data nodes |
916 | * Opt_no_chk_data_crc: do not check CRCs when reading data nodes | |
553dea4d | 917 | * Opt_override_compr: override default compressor |
1e51764a AB |
918 | * Opt_err: just end of array marker |
919 | */ | |
920 | enum { | |
921 | Opt_fast_unmount, | |
922 | Opt_norm_unmount, | |
4793e7c5 AH |
923 | Opt_bulk_read, |
924 | Opt_no_bulk_read, | |
2953e73f AH |
925 | Opt_chk_data_crc, |
926 | Opt_no_chk_data_crc, | |
553dea4d | 927 | Opt_override_compr, |
1e51764a AB |
928 | Opt_err, |
929 | }; | |
930 | ||
a447c093 | 931 | static const match_table_t tokens = { |
1e51764a AB |
932 | {Opt_fast_unmount, "fast_unmount"}, |
933 | {Opt_norm_unmount, "norm_unmount"}, | |
4793e7c5 AH |
934 | {Opt_bulk_read, "bulk_read"}, |
935 | {Opt_no_bulk_read, "no_bulk_read"}, | |
2953e73f AH |
936 | {Opt_chk_data_crc, "chk_data_crc"}, |
937 | {Opt_no_chk_data_crc, "no_chk_data_crc"}, | |
553dea4d | 938 | {Opt_override_compr, "compr=%s"}, |
1e51764a AB |
939 | {Opt_err, NULL}, |
940 | }; | |
941 | ||
8379ea31 AB |
942 | /** |
943 | * parse_standard_option - parse a standard mount option. | |
944 | * @option: the option to parse | |
945 | * | |
946 | * Normally, standard mount options like "sync" are passed to file-systems as | |
947 | * flags. However, when a "rootflags=" kernel boot parameter is used, they may | |
948 | * be present in the options string. This function tries to deal with this | |
949 | * situation and parse standard options. Returns 0 if the option was not | |
950 | * recognized, and the corresponding integer flag if it was. | |
951 | * | |
952 | * UBIFS is only interested in the "sync" option, so do not check for anything | |
953 | * else. | |
954 | */ | |
955 | static int parse_standard_option(const char *option) | |
956 | { | |
957 | ubifs_msg("parse %s", option); | |
958 | if (!strcmp(option, "sync")) | |
959 | return MS_SYNCHRONOUS; | |
960 | return 0; | |
961 | } | |
962 | ||
1e51764a AB |
963 | /** |
964 | * ubifs_parse_options - parse mount parameters. | |
965 | * @c: UBIFS file-system description object | |
966 | * @options: parameters to parse | |
967 | * @is_remount: non-zero if this is FS re-mount | |
968 | * | |
969 | * This function parses UBIFS mount options and returns zero in case success | |
970 | * and a negative error code in case of failure. | |
971 | */ | |
972 | static int ubifs_parse_options(struct ubifs_info *c, char *options, | |
973 | int is_remount) | |
974 | { | |
975 | char *p; | |
976 | substring_t args[MAX_OPT_ARGS]; | |
977 | ||
978 | if (!options) | |
979 | return 0; | |
980 | ||
981 | while ((p = strsep(&options, ","))) { | |
982 | int token; | |
983 | ||
984 | if (!*p) | |
985 | continue; | |
986 | ||
987 | token = match_token(p, tokens, args); | |
988 | switch (token) { | |
27ad2799 AB |
989 | /* |
990 | * %Opt_fast_unmount and %Opt_norm_unmount options are ignored. | |
cb54ef8b | 991 | * We accept them in order to be backward-compatible. But this |
27ad2799 AB |
992 | * should be removed at some point. |
993 | */ | |
1e51764a AB |
994 | case Opt_fast_unmount: |
995 | c->mount_opts.unmount_mode = 2; | |
1e51764a AB |
996 | break; |
997 | case Opt_norm_unmount: | |
998 | c->mount_opts.unmount_mode = 1; | |
1e51764a | 999 | break; |
4793e7c5 AH |
1000 | case Opt_bulk_read: |
1001 | c->mount_opts.bulk_read = 2; | |
1002 | c->bulk_read = 1; | |
1003 | break; | |
1004 | case Opt_no_bulk_read: | |
1005 | c->mount_opts.bulk_read = 1; | |
1006 | c->bulk_read = 0; | |
1007 | break; | |
2953e73f AH |
1008 | case Opt_chk_data_crc: |
1009 | c->mount_opts.chk_data_crc = 2; | |
1010 | c->no_chk_data_crc = 0; | |
1011 | break; | |
1012 | case Opt_no_chk_data_crc: | |
1013 | c->mount_opts.chk_data_crc = 1; | |
1014 | c->no_chk_data_crc = 1; | |
1015 | break; | |
553dea4d AB |
1016 | case Opt_override_compr: |
1017 | { | |
1018 | char *name = match_strdup(&args[0]); | |
1019 | ||
1020 | if (!name) | |
1021 | return -ENOMEM; | |
1022 | if (!strcmp(name, "none")) | |
1023 | c->mount_opts.compr_type = UBIFS_COMPR_NONE; | |
1024 | else if (!strcmp(name, "lzo")) | |
1025 | c->mount_opts.compr_type = UBIFS_COMPR_LZO; | |
1026 | else if (!strcmp(name, "zlib")) | |
1027 | c->mount_opts.compr_type = UBIFS_COMPR_ZLIB; | |
1028 | else { | |
1029 | ubifs_err("unknown compressor \"%s\"", name); | |
1030 | kfree(name); | |
1031 | return -EINVAL; | |
1032 | } | |
1033 | kfree(name); | |
1034 | c->mount_opts.override_compr = 1; | |
1035 | c->default_compr = c->mount_opts.compr_type; | |
1036 | break; | |
1037 | } | |
1e51764a | 1038 | default: |
8379ea31 AB |
1039 | { |
1040 | unsigned long flag; | |
1041 | struct super_block *sb = c->vfs_sb; | |
1042 | ||
1043 | flag = parse_standard_option(p); | |
1044 | if (!flag) { | |
79fda517 AB |
1045 | ubifs_err("unrecognized mount option \"%s\" or missing value", |
1046 | p); | |
8379ea31 AB |
1047 | return -EINVAL; |
1048 | } | |
1049 | sb->s_flags |= flag; | |
1050 | break; | |
1051 | } | |
1e51764a AB |
1052 | } |
1053 | } | |
1054 | ||
1055 | return 0; | |
1056 | } | |
1057 | ||
1058 | /** | |
1059 | * destroy_journal - destroy journal data structures. | |
1060 | * @c: UBIFS file-system description object | |
1061 | * | |
1062 | * This function destroys journal data structures including those that may have | |
1063 | * been created by recovery functions. | |
1064 | */ | |
1065 | static void destroy_journal(struct ubifs_info *c) | |
1066 | { | |
1067 | while (!list_empty(&c->unclean_leb_list)) { | |
1068 | struct ubifs_unclean_leb *ucleb; | |
1069 | ||
1070 | ucleb = list_entry(c->unclean_leb_list.next, | |
1071 | struct ubifs_unclean_leb, list); | |
1072 | list_del(&ucleb->list); | |
1073 | kfree(ucleb); | |
1074 | } | |
1075 | while (!list_empty(&c->old_buds)) { | |
1076 | struct ubifs_bud *bud; | |
1077 | ||
1078 | bud = list_entry(c->old_buds.next, struct ubifs_bud, list); | |
1079 | list_del(&bud->list); | |
1080 | kfree(bud); | |
1081 | } | |
1082 | ubifs_destroy_idx_gc(c); | |
1083 | ubifs_destroy_size_tree(c); | |
1084 | ubifs_tnc_close(c); | |
1085 | free_buds(c); | |
1086 | } | |
1087 | ||
3477d204 AB |
1088 | /** |
1089 | * bu_init - initialize bulk-read information. | |
1090 | * @c: UBIFS file-system description object | |
1091 | */ | |
1092 | static void bu_init(struct ubifs_info *c) | |
1093 | { | |
1094 | ubifs_assert(c->bulk_read == 1); | |
1095 | ||
1096 | if (c->bu.buf) | |
1097 | return; /* Already initialized */ | |
1098 | ||
1099 | again: | |
1100 | c->bu.buf = kmalloc(c->max_bu_buf_len, GFP_KERNEL | __GFP_NOWARN); | |
1101 | if (!c->bu.buf) { | |
1102 | if (c->max_bu_buf_len > UBIFS_KMALLOC_OK) { | |
1103 | c->max_bu_buf_len = UBIFS_KMALLOC_OK; | |
1104 | goto again; | |
1105 | } | |
1106 | ||
1107 | /* Just disable bulk-read */ | |
79fda517 AB |
1108 | ubifs_warn("cannot allocate %d bytes of memory for bulk-read, disabling it", |
1109 | c->max_bu_buf_len); | |
3477d204 AB |
1110 | c->mount_opts.bulk_read = 1; |
1111 | c->bulk_read = 0; | |
1112 | return; | |
1113 | } | |
1114 | } | |
1115 | ||
57a450e9 AB |
1116 | /** |
1117 | * check_free_space - check if there is enough free space to mount. | |
1118 | * @c: UBIFS file-system description object | |
1119 | * | |
1120 | * This function makes sure UBIFS has enough free space to be mounted in | |
1121 | * read/write mode. UBIFS must always have some free space to allow deletions. | |
1122 | */ | |
1123 | static int check_free_space(struct ubifs_info *c) | |
1124 | { | |
1125 | ubifs_assert(c->dark_wm > 0); | |
1126 | if (c->lst.total_free + c->lst.total_dirty < c->dark_wm) { | |
c4361570 | 1127 | ubifs_err("insufficient free space to mount in R/W mode"); |
edf6be24 AB |
1128 | ubifs_dump_budg(c, &c->bi); |
1129 | ubifs_dump_lprops(c); | |
a2b9df3f | 1130 | return -ENOSPC; |
57a450e9 AB |
1131 | } |
1132 | return 0; | |
1133 | } | |
1134 | ||
1e51764a AB |
1135 | /** |
1136 | * mount_ubifs - mount UBIFS file-system. | |
1137 | * @c: UBIFS file-system description object | |
1138 | * | |
1139 | * This function mounts UBIFS file system. Returns zero in case of success and | |
1140 | * a negative error code in case of failure. | |
1e51764a AB |
1141 | */ |
1142 | static int mount_ubifs(struct ubifs_info *c) | |
1143 | { | |
2ef13294 | 1144 | int err; |
3668b70f | 1145 | long long x, y; |
1e51764a AB |
1146 | size_t sz; |
1147 | ||
2ef13294 | 1148 | c->ro_mount = !!(c->vfs_sb->s_flags & MS_RDONLY); |
90bea5a3 DG |
1149 | /* Suppress error messages while probing if MS_SILENT is set */ |
1150 | c->probing = !!(c->vfs_sb->s_flags & MS_SILENT); | |
1151 | ||
1e51764a AB |
1152 | err = init_constants_early(c); |
1153 | if (err) | |
1154 | return err; | |
1155 | ||
17c2f9f8 AB |
1156 | err = ubifs_debugging_init(c); |
1157 | if (err) | |
1158 | return err; | |
1e51764a AB |
1159 | |
1160 | err = check_volume_empty(c); | |
1161 | if (err) | |
1162 | goto out_free; | |
1163 | ||
2ef13294 | 1164 | if (c->empty && (c->ro_mount || c->ro_media)) { |
1e51764a AB |
1165 | /* |
1166 | * This UBI volume is empty, and read-only, or the file system | |
1167 | * is mounted read-only - we cannot format it. | |
1168 | */ | |
1169 | ubifs_err("can't format empty UBI volume: read-only %s", | |
1170 | c->ro_media ? "UBI volume" : "mount"); | |
1171 | err = -EROFS; | |
1172 | goto out_free; | |
1173 | } | |
1174 | ||
2ef13294 | 1175 | if (c->ro_media && !c->ro_mount) { |
1e51764a AB |
1176 | ubifs_err("cannot mount read-write - read-only media"); |
1177 | err = -EROFS; | |
1178 | goto out_free; | |
1179 | } | |
1180 | ||
1181 | /* | |
1182 | * The requirement for the buffer is that it should fit indexing B-tree | |
1183 | * height amount of integers. We assume the height if the TNC tree will | |
1184 | * never exceed 64. | |
1185 | */ | |
1186 | err = -ENOMEM; | |
1187 | c->bottom_up_buf = kmalloc(BOTTOM_UP_HEIGHT * sizeof(int), GFP_KERNEL); | |
1188 | if (!c->bottom_up_buf) | |
1189 | goto out_free; | |
1190 | ||
1191 | c->sbuf = vmalloc(c->leb_size); | |
1192 | if (!c->sbuf) | |
1193 | goto out_free; | |
1194 | ||
2ef13294 | 1195 | if (!c->ro_mount) { |
1e51764a AB |
1196 | c->ileb_buf = vmalloc(c->leb_size); |
1197 | if (!c->ileb_buf) | |
1198 | goto out_free; | |
1199 | } | |
1200 | ||
3477d204 AB |
1201 | if (c->bulk_read == 1) |
1202 | bu_init(c); | |
1203 | ||
d882962f MC |
1204 | if (!c->ro_mount) { |
1205 | c->write_reserve_buf = kmalloc(COMPRESSED_DATA_NODE_BUF_SZ, | |
1206 | GFP_KERNEL); | |
1207 | if (!c->write_reserve_buf) | |
1208 | goto out_free; | |
1209 | } | |
1210 | ||
18d1d7fb | 1211 | c->mounting = 1; |
2953e73f | 1212 | |
1e51764a AB |
1213 | err = ubifs_read_superblock(c); |
1214 | if (err) | |
1215 | goto out_free; | |
1216 | ||
90bea5a3 DG |
1217 | c->probing = 0; |
1218 | ||
1e51764a | 1219 | /* |
553dea4d | 1220 | * Make sure the compressor which is set as default in the superblock |
57a450e9 | 1221 | * or overridden by mount options is actually compiled in. |
1e51764a AB |
1222 | */ |
1223 | if (!ubifs_compr_present(c->default_compr)) { | |
553dea4d AB |
1224 | ubifs_err("'compressor \"%s\" is not compiled in", |
1225 | ubifs_compr_name(c->default_compr)); | |
8eec2f36 | 1226 | err = -ENOTSUPP; |
553dea4d | 1227 | goto out_free; |
1e51764a AB |
1228 | } |
1229 | ||
79807d07 | 1230 | err = init_constants_sb(c); |
1e51764a | 1231 | if (err) |
17c2f9f8 | 1232 | goto out_free; |
1e51764a AB |
1233 | |
1234 | sz = ALIGN(c->max_idx_node_sz, c->min_io_size); | |
1235 | sz = ALIGN(sz + c->max_idx_node_sz, c->min_io_size); | |
1236 | c->cbuf = kmalloc(sz, GFP_NOFS); | |
1237 | if (!c->cbuf) { | |
1238 | err = -ENOMEM; | |
17c2f9f8 | 1239 | goto out_free; |
1e51764a AB |
1240 | } |
1241 | ||
b50b9f40 AB |
1242 | err = alloc_wbufs(c); |
1243 | if (err) | |
1244 | goto out_cbuf; | |
1245 | ||
0855f310 | 1246 | sprintf(c->bgt_name, BGT_NAME_PATTERN, c->vi.ubi_num, c->vi.vol_id); |
2ef13294 | 1247 | if (!c->ro_mount) { |
1e51764a | 1248 | /* Create background thread */ |
fcabb347 | 1249 | c->bgt = kthread_create(ubifs_bg_thread, c, "%s", c->bgt_name); |
1e51764a AB |
1250 | if (IS_ERR(c->bgt)) { |
1251 | err = PTR_ERR(c->bgt); | |
1252 | c->bgt = NULL; | |
1253 | ubifs_err("cannot spawn \"%s\", error %d", | |
1254 | c->bgt_name, err); | |
1255 | goto out_wbufs; | |
1256 | } | |
1257 | wake_up_process(c->bgt); | |
1258 | } | |
1259 | ||
1260 | err = ubifs_read_master(c); | |
1261 | if (err) | |
1262 | goto out_master; | |
1263 | ||
09801194 BG |
1264 | init_constants_master(c); |
1265 | ||
1e51764a AB |
1266 | if ((c->mst_node->flags & cpu_to_le32(UBIFS_MST_DIRTY)) != 0) { |
1267 | ubifs_msg("recovery needed"); | |
1268 | c->need_recovery = 1; | |
781c5717 BG |
1269 | } |
1270 | ||
781c5717 BG |
1271 | if (c->need_recovery && !c->ro_mount) { |
1272 | err = ubifs_recover_inl_heads(c, c->sbuf); | |
1273 | if (err) | |
1274 | goto out_master; | |
1275 | } | |
1276 | ||
1277 | err = ubifs_lpt_init(c, 1, !c->ro_mount); | |
1278 | if (err) | |
1279 | goto out_master; | |
1280 | ||
09801194 BG |
1281 | if (!c->ro_mount && c->space_fixup) { |
1282 | err = ubifs_fixup_free_space(c); | |
1283 | if (err) | |
56b04e3e | 1284 | goto out_lpt; |
09801194 BG |
1285 | } |
1286 | ||
781c5717 | 1287 | if (!c->ro_mount) { |
1e51764a AB |
1288 | /* |
1289 | * Set the "dirty" flag so that if we reboot uncleanly we | |
1290 | * will notice this immediately on the next mount. | |
1291 | */ | |
1292 | c->mst_node->flags |= cpu_to_le32(UBIFS_MST_DIRTY); | |
1293 | err = ubifs_write_master(c); | |
1294 | if (err) | |
781c5717 | 1295 | goto out_lpt; |
1e51764a AB |
1296 | } |
1297 | ||
b137545c | 1298 | err = dbg_check_idx_size(c, c->bi.old_idx_sz); |
1e51764a AB |
1299 | if (err) |
1300 | goto out_lpt; | |
1301 | ||
1302 | err = ubifs_replay_journal(c); | |
1303 | if (err) | |
1304 | goto out_journal; | |
1305 | ||
1fb8bd01 | 1306 | /* Calculate 'min_idx_lebs' after journal replay */ |
b137545c | 1307 | c->bi.min_idx_lebs = ubifs_calc_min_idx_lebs(c); |
1fb8bd01 | 1308 | |
2ef13294 | 1309 | err = ubifs_mount_orphans(c, c->need_recovery, c->ro_mount); |
1e51764a AB |
1310 | if (err) |
1311 | goto out_orphans; | |
1312 | ||
2ef13294 | 1313 | if (!c->ro_mount) { |
1e51764a AB |
1314 | int lnum; |
1315 | ||
57a450e9 AB |
1316 | err = check_free_space(c); |
1317 | if (err) | |
1e51764a | 1318 | goto out_orphans; |
1e51764a AB |
1319 | |
1320 | /* Check for enough log space */ | |
1321 | lnum = c->lhead_lnum + 1; | |
1322 | if (lnum >= UBIFS_LOG_LNUM + c->log_lebs) | |
1323 | lnum = UBIFS_LOG_LNUM; | |
1324 | if (lnum == c->ltail_lnum) { | |
1325 | err = ubifs_consolidate_log(c); | |
1326 | if (err) | |
1327 | goto out_orphans; | |
1328 | } | |
1329 | ||
1330 | if (c->need_recovery) { | |
1331 | err = ubifs_recover_size(c); | |
1332 | if (err) | |
1333 | goto out_orphans; | |
1334 | err = ubifs_rcvry_gc_commit(c); | |
276de5d2 AB |
1335 | if (err) |
1336 | goto out_orphans; | |
b4978e94 | 1337 | } else { |
1e51764a | 1338 | err = take_gc_lnum(c); |
b4978e94 AB |
1339 | if (err) |
1340 | goto out_orphans; | |
1341 | ||
1342 | /* | |
1343 | * GC LEB may contain garbage if there was an unclean | |
1344 | * reboot, and it should be un-mapped. | |
1345 | */ | |
1346 | err = ubifs_leb_unmap(c, c->gc_lnum); | |
1347 | if (err) | |
c18de72f | 1348 | goto out_orphans; |
b4978e94 | 1349 | } |
1e51764a AB |
1350 | |
1351 | err = dbg_check_lprops(c); | |
1352 | if (err) | |
1353 | goto out_orphans; | |
1354 | } else if (c->need_recovery) { | |
1355 | err = ubifs_recover_size(c); | |
1356 | if (err) | |
1357 | goto out_orphans; | |
b4978e94 AB |
1358 | } else { |
1359 | /* | |
1360 | * Even if we mount read-only, we have to set space in GC LEB | |
1361 | * to proper value because this affects UBIFS free space | |
1362 | * reporting. We do not want to have a situation when | |
1363 | * re-mounting from R/O to R/W changes amount of free space. | |
1364 | */ | |
1365 | err = take_gc_lnum(c); | |
1366 | if (err) | |
1367 | goto out_orphans; | |
1e51764a AB |
1368 | } |
1369 | ||
1370 | spin_lock(&ubifs_infos_lock); | |
1371 | list_add_tail(&c->infos_list, &ubifs_infos); | |
1372 | spin_unlock(&ubifs_infos_lock); | |
1373 | ||
1374 | if (c->need_recovery) { | |
2ef13294 | 1375 | if (c->ro_mount) |
1e51764a AB |
1376 | ubifs_msg("recovery deferred"); |
1377 | else { | |
1378 | c->need_recovery = 0; | |
1379 | ubifs_msg("recovery completed"); | |
b221337a AB |
1380 | /* |
1381 | * GC LEB has to be empty and taken at this point. But | |
1382 | * the journal head LEBs may also be accounted as | |
1383 | * "empty taken" if they are empty. | |
1384 | */ | |
1385 | ubifs_assert(c->lst.taken_empty_lebs > 0); | |
1e51764a | 1386 | } |
6ba87c9b | 1387 | } else |
b221337a | 1388 | ubifs_assert(c->lst.taken_empty_lebs > 0); |
1e51764a | 1389 | |
6ba87c9b | 1390 | err = dbg_check_filesystem(c); |
552ff317 AB |
1391 | if (err) |
1392 | goto out_infos; | |
1393 | ||
6ba87c9b | 1394 | err = dbg_debugfs_init_fs(c); |
1e51764a AB |
1395 | if (err) |
1396 | goto out_infos; | |
1397 | ||
18d1d7fb | 1398 | c->mounting = 0; |
2953e73f | 1399 | |
3668b70f AB |
1400 | ubifs_msg("mounted UBI device %d, volume %d, name \"%s\"%s", |
1401 | c->vi.ubi_num, c->vi.vol_id, c->vi.name, | |
beadadfa | 1402 | c->ro_mount ? ", R/O mode" : ""); |
1e51764a | 1403 | x = (long long)c->main_lebs * c->leb_size; |
3668b70f AB |
1404 | y = (long long)c->log_lebs * c->leb_size + c->max_bud_bytes; |
1405 | ubifs_msg("LEB size: %d bytes (%d KiB), min./max. I/O unit sizes: %d bytes/%d bytes", | |
1406 | c->leb_size, c->leb_size >> 10, c->min_io_size, | |
1407 | c->max_write_size); | |
1408 | ubifs_msg("FS size: %lld bytes (%lld MiB, %d LEBs), journal size %lld bytes (%lld MiB, %d LEBs)", | |
1409 | x, x >> 20, c->main_lebs, | |
1410 | y, y >> 20, c->log_lebs + c->max_bud_cnt); | |
1411 | ubifs_msg("reserved for root: %llu bytes (%llu KiB)", | |
1412 | c->report_rp_size, c->report_rp_size >> 10); | |
1413 | ubifs_msg("media format: w%d/r%d (latest is w%d/r%d), UUID %pUB%s", | |
963f0cf6 | 1414 | c->fmt_version, c->ro_compat_version, |
3668b70f AB |
1415 | UBIFS_FORMAT_VERSION, UBIFS_RO_COMPAT_VERSION, c->uuid, |
1416 | c->big_lpt ? ", big LPT model" : ", small LPT model"); | |
1417 | ||
1418 | dbg_gen("default compressor: %s", ubifs_compr_name(c->default_compr)); | |
1419 | dbg_gen("data journal heads: %d", | |
1e51764a | 1420 | c->jhead_cnt - NONDATA_JHEADS_CNT); |
3668b70f | 1421 | dbg_gen("log LEBs: %d (%d - %d)", |
1e51764a | 1422 | c->log_lebs, UBIFS_LOG_LNUM, c->log_last); |
3668b70f | 1423 | dbg_gen("LPT area LEBs: %d (%d - %d)", |
1e51764a | 1424 | c->lpt_lebs, c->lpt_first, c->lpt_last); |
3668b70f | 1425 | dbg_gen("orphan area LEBs: %d (%d - %d)", |
1e51764a | 1426 | c->orph_lebs, c->orph_first, c->orph_last); |
3668b70f | 1427 | dbg_gen("main area LEBs: %d (%d - %d)", |
1e51764a | 1428 | c->main_lebs, c->main_first, c->leb_cnt - 1); |
3668b70f AB |
1429 | dbg_gen("index LEBs: %d", c->lst.idx_lebs); |
1430 | dbg_gen("total index bytes: %lld (%lld KiB, %lld MiB)", | |
b137545c AB |
1431 | c->bi.old_idx_sz, c->bi.old_idx_sz >> 10, |
1432 | c->bi.old_idx_sz >> 20); | |
3668b70f AB |
1433 | dbg_gen("key hash type: %d", c->key_hash_type); |
1434 | dbg_gen("tree fanout: %d", c->fanout); | |
1435 | dbg_gen("reserved GC LEB: %d", c->gc_lnum); | |
1436 | dbg_gen("max. znode size %d", c->max_znode_sz); | |
1437 | dbg_gen("max. index node size %d", c->max_idx_node_sz); | |
1438 | dbg_gen("node sizes: data %zu, inode %zu, dentry %zu", | |
8e5033ad | 1439 | UBIFS_DATA_NODE_SZ, UBIFS_INO_NODE_SZ, UBIFS_DENT_NODE_SZ); |
3668b70f | 1440 | dbg_gen("node sizes: trun %zu, sb %zu, master %zu", |
8e5033ad | 1441 | UBIFS_TRUN_NODE_SZ, UBIFS_SB_NODE_SZ, UBIFS_MST_NODE_SZ); |
3668b70f | 1442 | dbg_gen("node sizes: ref %zu, cmt. start %zu, orph %zu", |
8e5033ad | 1443 | UBIFS_REF_NODE_SZ, UBIFS_CS_NODE_SZ, UBIFS_ORPH_NODE_SZ); |
3668b70f | 1444 | dbg_gen("max. node sizes: data %zu, inode %zu dentry %zu, idx %d", |
c4361570 | 1445 | UBIFS_MAX_DATA_NODE_SZ, UBIFS_MAX_INO_NODE_SZ, |
6342aaeb | 1446 | UBIFS_MAX_DENT_NODE_SZ, ubifs_idx_node_sz(c, c->fanout)); |
3668b70f AB |
1447 | dbg_gen("dead watermark: %d", c->dead_wm); |
1448 | dbg_gen("dark watermark: %d", c->dark_wm); | |
1449 | dbg_gen("LEB overhead: %d", c->leb_overhead); | |
1e51764a | 1450 | x = (long long)c->main_lebs * c->dark_wm; |
3668b70f | 1451 | dbg_gen("max. dark space: %lld (%lld KiB, %lld MiB)", |
1e51764a | 1452 | x, x >> 10, x >> 20); |
3668b70f | 1453 | dbg_gen("maximum bud bytes: %lld (%lld KiB, %lld MiB)", |
1e51764a AB |
1454 | c->max_bud_bytes, c->max_bud_bytes >> 10, |
1455 | c->max_bud_bytes >> 20); | |
3668b70f | 1456 | dbg_gen("BG commit bud bytes: %lld (%lld KiB, %lld MiB)", |
1e51764a AB |
1457 | c->bg_bud_bytes, c->bg_bud_bytes >> 10, |
1458 | c->bg_bud_bytes >> 20); | |
3668b70f | 1459 | dbg_gen("current bud bytes %lld (%lld KiB, %lld MiB)", |
1e51764a | 1460 | c->bud_bytes, c->bud_bytes >> 10, c->bud_bytes >> 20); |
3668b70f AB |
1461 | dbg_gen("max. seq. number: %llu", c->max_sqnum); |
1462 | dbg_gen("commit number: %llu", c->cmt_no); | |
1e51764a AB |
1463 | |
1464 | return 0; | |
1465 | ||
1466 | out_infos: | |
1467 | spin_lock(&ubifs_infos_lock); | |
1468 | list_del(&c->infos_list); | |
1469 | spin_unlock(&ubifs_infos_lock); | |
1470 | out_orphans: | |
1471 | free_orphans(c); | |
1472 | out_journal: | |
1473 | destroy_journal(c); | |
1474 | out_lpt: | |
1475 | ubifs_lpt_free(c, 0); | |
1476 | out_master: | |
1477 | kfree(c->mst_node); | |
1478 | kfree(c->rcvrd_mst_node); | |
1479 | if (c->bgt) | |
1480 | kthread_stop(c->bgt); | |
1481 | out_wbufs: | |
1482 | free_wbufs(c); | |
1483 | out_cbuf: | |
1484 | kfree(c->cbuf); | |
1e51764a | 1485 | out_free: |
d882962f | 1486 | kfree(c->write_reserve_buf); |
3477d204 | 1487 | kfree(c->bu.buf); |
1e51764a AB |
1488 | vfree(c->ileb_buf); |
1489 | vfree(c->sbuf); | |
1490 | kfree(c->bottom_up_buf); | |
17c2f9f8 | 1491 | ubifs_debugging_exit(c); |
1e51764a AB |
1492 | return err; |
1493 | } | |
1494 | ||
1495 | /** | |
1496 | * ubifs_umount - un-mount UBIFS file-system. | |
1497 | * @c: UBIFS file-system description object | |
1498 | * | |
1499 | * Note, this function is called to free allocated resourced when un-mounting, | |
1500 | * as well as free resources when an error occurred while we were half way | |
1501 | * through mounting (error path cleanup function). So it has to make sure the | |
1502 | * resource was actually allocated before freeing it. | |
1503 | */ | |
1504 | static void ubifs_umount(struct ubifs_info *c) | |
1505 | { | |
1506 | dbg_gen("un-mounting UBI device %d, volume %d", c->vi.ubi_num, | |
1507 | c->vi.vol_id); | |
1508 | ||
552ff317 | 1509 | dbg_debugfs_exit_fs(c); |
1e51764a AB |
1510 | spin_lock(&ubifs_infos_lock); |
1511 | list_del(&c->infos_list); | |
1512 | spin_unlock(&ubifs_infos_lock); | |
1513 | ||
1514 | if (c->bgt) | |
1515 | kthread_stop(c->bgt); | |
1516 | ||
1517 | destroy_journal(c); | |
1518 | free_wbufs(c); | |
1519 | free_orphans(c); | |
1520 | ubifs_lpt_free(c, 0); | |
1521 | ||
1522 | kfree(c->cbuf); | |
1523 | kfree(c->rcvrd_mst_node); | |
1524 | kfree(c->mst_node); | |
d882962f | 1525 | kfree(c->write_reserve_buf); |
3477d204 AB |
1526 | kfree(c->bu.buf); |
1527 | vfree(c->ileb_buf); | |
1e51764a AB |
1528 | vfree(c->sbuf); |
1529 | kfree(c->bottom_up_buf); | |
17c2f9f8 | 1530 | ubifs_debugging_exit(c); |
1e51764a AB |
1531 | } |
1532 | ||
1533 | /** | |
1534 | * ubifs_remount_rw - re-mount in read-write mode. | |
1535 | * @c: UBIFS file-system description object | |
1536 | * | |
1537 | * UBIFS avoids allocating many unnecessary resources when mounted in read-only | |
1538 | * mode. This function allocates the needed resources and re-mounts UBIFS in | |
1539 | * read-write mode. | |
1540 | */ | |
1541 | static int ubifs_remount_rw(struct ubifs_info *c) | |
1542 | { | |
1543 | int err, lnum; | |
1544 | ||
963f0cf6 AB |
1545 | if (c->rw_incompat) { |
1546 | ubifs_err("the file-system is not R/W-compatible"); | |
79fda517 AB |
1547 | ubifs_msg("on-flash format version is w%d/r%d, but software only supports up to version w%d/r%d", |
1548 | c->fmt_version, c->ro_compat_version, | |
1549 | UBIFS_FORMAT_VERSION, UBIFS_RO_COMPAT_VERSION); | |
963f0cf6 AB |
1550 | return -EROFS; |
1551 | } | |
1552 | ||
1e51764a | 1553 | mutex_lock(&c->umount_mutex); |
84abf972 | 1554 | dbg_save_space_info(c); |
1e51764a | 1555 | c->remounting_rw = 1; |
c88ac00c | 1556 | c->ro_mount = 0; |
1e51764a | 1557 | |
67e753ca AB |
1558 | if (c->space_fixup) { |
1559 | err = ubifs_fixup_free_space(c); | |
1560 | if (err) | |
fcdd57c8 | 1561 | goto out; |
67e753ca AB |
1562 | } |
1563 | ||
57a450e9 AB |
1564 | err = check_free_space(c); |
1565 | if (err) | |
1e51764a | 1566 | goto out; |
1e51764a AB |
1567 | |
1568 | if (c->old_leb_cnt != c->leb_cnt) { | |
1569 | struct ubifs_sb_node *sup; | |
1570 | ||
1571 | sup = ubifs_read_sb_node(c); | |
1572 | if (IS_ERR(sup)) { | |
1573 | err = PTR_ERR(sup); | |
1574 | goto out; | |
1575 | } | |
1576 | sup->leb_cnt = cpu_to_le32(c->leb_cnt); | |
1577 | err = ubifs_write_sb_node(c, sup); | |
eaeee242 | 1578 | kfree(sup); |
1e51764a AB |
1579 | if (err) |
1580 | goto out; | |
1581 | } | |
1582 | ||
1583 | if (c->need_recovery) { | |
1584 | ubifs_msg("completing deferred recovery"); | |
1585 | err = ubifs_write_rcvrd_mst_node(c); | |
1586 | if (err) | |
1587 | goto out; | |
1588 | err = ubifs_recover_size(c); | |
1589 | if (err) | |
1590 | goto out; | |
1591 | err = ubifs_clean_lebs(c, c->sbuf); | |
1592 | if (err) | |
1593 | goto out; | |
1594 | err = ubifs_recover_inl_heads(c, c->sbuf); | |
1595 | if (err) | |
1596 | goto out; | |
49d128aa AH |
1597 | } else { |
1598 | /* A readonly mount is not allowed to have orphans */ | |
1599 | ubifs_assert(c->tot_orphans == 0); | |
1600 | err = ubifs_clear_orphans(c); | |
1601 | if (err) | |
1602 | goto out; | |
1e51764a AB |
1603 | } |
1604 | ||
1605 | if (!(c->mst_node->flags & cpu_to_le32(UBIFS_MST_DIRTY))) { | |
1606 | c->mst_node->flags |= cpu_to_le32(UBIFS_MST_DIRTY); | |
1607 | err = ubifs_write_master(c); | |
1608 | if (err) | |
1609 | goto out; | |
1610 | } | |
1611 | ||
1612 | c->ileb_buf = vmalloc(c->leb_size); | |
1613 | if (!c->ileb_buf) { | |
1614 | err = -ENOMEM; | |
1615 | goto out; | |
1616 | } | |
1617 | ||
d882962f | 1618 | c->write_reserve_buf = kmalloc(COMPRESSED_DATA_NODE_BUF_SZ, GFP_KERNEL); |
7203db97 WY |
1619 | if (!c->write_reserve_buf) { |
1620 | err = -ENOMEM; | |
d882962f | 1621 | goto out; |
7203db97 | 1622 | } |
d882962f | 1623 | |
1e51764a AB |
1624 | err = ubifs_lpt_init(c, 0, 1); |
1625 | if (err) | |
1626 | goto out; | |
1627 | ||
1e51764a | 1628 | /* Create background thread */ |
fcabb347 | 1629 | c->bgt = kthread_create(ubifs_bg_thread, c, "%s", c->bgt_name); |
1e51764a AB |
1630 | if (IS_ERR(c->bgt)) { |
1631 | err = PTR_ERR(c->bgt); | |
1632 | c->bgt = NULL; | |
1633 | ubifs_err("cannot spawn \"%s\", error %d", | |
1634 | c->bgt_name, err); | |
2953e73f | 1635 | goto out; |
1e51764a AB |
1636 | } |
1637 | wake_up_process(c->bgt); | |
1638 | ||
1639 | c->orph_buf = vmalloc(c->leb_size); | |
2953e73f AH |
1640 | if (!c->orph_buf) { |
1641 | err = -ENOMEM; | |
1642 | goto out; | |
1643 | } | |
1e51764a AB |
1644 | |
1645 | /* Check for enough log space */ | |
1646 | lnum = c->lhead_lnum + 1; | |
1647 | if (lnum >= UBIFS_LOG_LNUM + c->log_lebs) | |
1648 | lnum = UBIFS_LOG_LNUM; | |
1649 | if (lnum == c->ltail_lnum) { | |
1650 | err = ubifs_consolidate_log(c); | |
1651 | if (err) | |
1652 | goto out; | |
1653 | } | |
1654 | ||
1655 | if (c->need_recovery) | |
1656 | err = ubifs_rcvry_gc_commit(c); | |
1657 | else | |
b4978e94 | 1658 | err = ubifs_leb_unmap(c, c->gc_lnum); |
1e51764a AB |
1659 | if (err) |
1660 | goto out; | |
1661 | ||
8c230d9a AB |
1662 | dbg_gen("re-mounted read-write"); |
1663 | c->remounting_rw = 0; | |
1664 | ||
1e51764a AB |
1665 | if (c->need_recovery) { |
1666 | c->need_recovery = 0; | |
1667 | ubifs_msg("deferred recovery completed"); | |
8c230d9a AB |
1668 | } else { |
1669 | /* | |
1670 | * Do not run the debugging space check if the were doing | |
1671 | * recovery, because when we saved the information we had the | |
1672 | * file-system in a state where the TNC and lprops has been | |
1673 | * modified in memory, but all the I/O operations (including a | |
1674 | * commit) were deferred. So the file-system was in | |
1675 | * "non-committed" state. Now the file-system is in committed | |
1676 | * state, and of course the amount of free space will change | |
1677 | * because, for example, the old index size was imprecise. | |
1678 | */ | |
1679 | err = dbg_check_space_info(c); | |
1e51764a | 1680 | } |
9d510db4 | 1681 | |
1e51764a | 1682 | mutex_unlock(&c->umount_mutex); |
84abf972 | 1683 | return err; |
1e51764a AB |
1684 | |
1685 | out: | |
c88ac00c | 1686 | c->ro_mount = 1; |
1e51764a AB |
1687 | vfree(c->orph_buf); |
1688 | c->orph_buf = NULL; | |
1689 | if (c->bgt) { | |
1690 | kthread_stop(c->bgt); | |
1691 | c->bgt = NULL; | |
1692 | } | |
1693 | free_wbufs(c); | |
d882962f MC |
1694 | kfree(c->write_reserve_buf); |
1695 | c->write_reserve_buf = NULL; | |
1e51764a AB |
1696 | vfree(c->ileb_buf); |
1697 | c->ileb_buf = NULL; | |
1698 | ubifs_lpt_free(c, 1); | |
1699 | c->remounting_rw = 0; | |
1700 | mutex_unlock(&c->umount_mutex); | |
1701 | return err; | |
1702 | } | |
1703 | ||
1e51764a AB |
1704 | /** |
1705 | * ubifs_remount_ro - re-mount in read-only mode. | |
1706 | * @c: UBIFS file-system description object | |
1707 | * | |
84abf972 AB |
1708 | * We assume VFS has stopped writing. Possibly the background thread could be |
1709 | * running a commit, however kthread_stop will wait in that case. | |
1e51764a AB |
1710 | */ |
1711 | static void ubifs_remount_ro(struct ubifs_info *c) | |
1712 | { | |
1713 | int i, err; | |
1714 | ||
1715 | ubifs_assert(!c->need_recovery); | |
2ef13294 | 1716 | ubifs_assert(!c->ro_mount); |
e4d9b6cb | 1717 | |
1e51764a AB |
1718 | mutex_lock(&c->umount_mutex); |
1719 | if (c->bgt) { | |
1720 | kthread_stop(c->bgt); | |
1721 | c->bgt = NULL; | |
1722 | } | |
1723 | ||
84abf972 AB |
1724 | dbg_save_space_info(c); |
1725 | ||
39037559 | 1726 | for (i = 0; i < c->jhead_cnt; i++) |
1e51764a | 1727 | ubifs_wbuf_sync(&c->jheads[i].wbuf); |
1e51764a | 1728 | |
e4d9b6cb AB |
1729 | c->mst_node->flags &= ~cpu_to_le32(UBIFS_MST_DIRTY); |
1730 | c->mst_node->flags |= cpu_to_le32(UBIFS_MST_NO_ORPHS); | |
1731 | c->mst_node->gc_lnum = cpu_to_le32(c->gc_lnum); | |
1732 | err = ubifs_write_master(c); | |
1733 | if (err) | |
1734 | ubifs_ro_mode(c, err); | |
1735 | ||
1e51764a AB |
1736 | vfree(c->orph_buf); |
1737 | c->orph_buf = NULL; | |
d882962f MC |
1738 | kfree(c->write_reserve_buf); |
1739 | c->write_reserve_buf = NULL; | |
1e51764a AB |
1740 | vfree(c->ileb_buf); |
1741 | c->ileb_buf = NULL; | |
1742 | ubifs_lpt_free(c, 1); | |
2ef13294 | 1743 | c->ro_mount = 1; |
84abf972 AB |
1744 | err = dbg_check_space_info(c); |
1745 | if (err) | |
1746 | ubifs_ro_mode(c, err); | |
1e51764a AB |
1747 | mutex_unlock(&c->umount_mutex); |
1748 | } | |
1749 | ||
1750 | static void ubifs_put_super(struct super_block *sb) | |
1751 | { | |
1752 | int i; | |
1753 | struct ubifs_info *c = sb->s_fs_info; | |
1754 | ||
1755 | ubifs_msg("un-mount UBI device %d, volume %d", c->vi.ubi_num, | |
1756 | c->vi.vol_id); | |
6cfd0148 | 1757 | |
1e51764a AB |
1758 | /* |
1759 | * The following asserts are only valid if there has not been a failure | |
1760 | * of the media. For example, there will be dirty inodes if we failed | |
1761 | * to write them back because of I/O errors. | |
1762 | */ | |
1a067a22 | 1763 | if (!c->ro_error) { |
b137545c AB |
1764 | ubifs_assert(c->bi.idx_growth == 0); |
1765 | ubifs_assert(c->bi.dd_growth == 0); | |
1766 | ubifs_assert(c->bi.data_growth == 0); | |
1a067a22 | 1767 | } |
1e51764a AB |
1768 | |
1769 | /* | |
1770 | * The 'c->umount_lock' prevents races between UBIFS memory shrinker | |
1771 | * and file system un-mount. Namely, it prevents the shrinker from | |
1772 | * picking this superblock for shrinking - it will be just skipped if | |
1773 | * the mutex is locked. | |
1774 | */ | |
1775 | mutex_lock(&c->umount_mutex); | |
2ef13294 | 1776 | if (!c->ro_mount) { |
1e51764a AB |
1777 | /* |
1778 | * First of all kill the background thread to make sure it does | |
1779 | * not interfere with un-mounting and freeing resources. | |
1780 | */ | |
1781 | if (c->bgt) { | |
1782 | kthread_stop(c->bgt); | |
1783 | c->bgt = NULL; | |
1784 | } | |
1785 | ||
1e51764a | 1786 | /* |
2680d722 | 1787 | * On fatal errors c->ro_error is set to 1, in which case we do |
1e51764a AB |
1788 | * not write the master node. |
1789 | */ | |
2680d722 | 1790 | if (!c->ro_error) { |
2ef13294 AB |
1791 | int err; |
1792 | ||
1793 | /* Synchronize write-buffers */ | |
39037559 AB |
1794 | for (i = 0; i < c->jhead_cnt; i++) |
1795 | ubifs_wbuf_sync(&c->jheads[i].wbuf); | |
2ef13294 | 1796 | |
1e51764a AB |
1797 | /* |
1798 | * We are being cleanly unmounted which means the | |
1799 | * orphans were killed - indicate this in the master | |
1800 | * node. Also save the reserved GC LEB number. | |
1801 | */ | |
1e51764a AB |
1802 | c->mst_node->flags &= ~cpu_to_le32(UBIFS_MST_DIRTY); |
1803 | c->mst_node->flags |= cpu_to_le32(UBIFS_MST_NO_ORPHS); | |
1804 | c->mst_node->gc_lnum = cpu_to_le32(c->gc_lnum); | |
1805 | err = ubifs_write_master(c); | |
1806 | if (err) | |
1807 | /* | |
1808 | * Recovery will attempt to fix the master area | |
1809 | * next mount, so we just print a message and | |
1810 | * continue to unmount normally. | |
1811 | */ | |
79fda517 AB |
1812 | ubifs_err("failed to write master node, error %d", |
1813 | err); | |
3601ba27 AB |
1814 | } else { |
1815 | for (i = 0; i < c->jhead_cnt; i++) | |
1816 | /* Make sure write-buffer timers are canceled */ | |
1817 | hrtimer_cancel(&c->jheads[i].wbuf.timer); | |
1e51764a AB |
1818 | } |
1819 | } | |
1820 | ||
1821 | ubifs_umount(c); | |
1822 | bdi_destroy(&c->bdi); | |
1823 | ubi_close_volume(c->ubi); | |
1824 | mutex_unlock(&c->umount_mutex); | |
1e51764a AB |
1825 | } |
1826 | ||
1827 | static int ubifs_remount_fs(struct super_block *sb, int *flags, char *data) | |
1828 | { | |
1829 | int err; | |
1830 | struct ubifs_info *c = sb->s_fs_info; | |
1831 | ||
02b9984d | 1832 | sync_filesystem(sb); |
1e51764a AB |
1833 | dbg_gen("old flags %#lx, new flags %#x", sb->s_flags, *flags); |
1834 | ||
1835 | err = ubifs_parse_options(c, data, 1); | |
1836 | if (err) { | |
1837 | ubifs_err("invalid or unknown remount parameter"); | |
1838 | return err; | |
1839 | } | |
3477d204 | 1840 | |
2ef13294 | 1841 | if (c->ro_mount && !(*flags & MS_RDONLY)) { |
2680d722 AB |
1842 | if (c->ro_error) { |
1843 | ubifs_msg("cannot re-mount R/W due to prior errors"); | |
1844 | return -EROFS; | |
1845 | } | |
e4d9b6cb | 1846 | if (c->ro_media) { |
2680d722 | 1847 | ubifs_msg("cannot re-mount R/W - UBI volume is R/O"); |
a2b9df3f | 1848 | return -EROFS; |
e4d9b6cb | 1849 | } |
1e51764a | 1850 | err = ubifs_remount_rw(c); |
e9d6bbc4 | 1851 | if (err) |
1e51764a | 1852 | return err; |
2ef13294 | 1853 | } else if (!c->ro_mount && (*flags & MS_RDONLY)) { |
2680d722 AB |
1854 | if (c->ro_error) { |
1855 | ubifs_msg("cannot re-mount R/O due to prior errors"); | |
a2b9df3f | 1856 | return -EROFS; |
b466f17d | 1857 | } |
1e51764a | 1858 | ubifs_remount_ro(c); |
b466f17d | 1859 | } |
1e51764a | 1860 | |
3477d204 AB |
1861 | if (c->bulk_read == 1) |
1862 | bu_init(c); | |
1863 | else { | |
1864 | dbg_gen("disable bulk-read"); | |
1865 | kfree(c->bu.buf); | |
1866 | c->bu.buf = NULL; | |
1867 | } | |
1868 | ||
b221337a | 1869 | ubifs_assert(c->lst.taken_empty_lebs > 0); |
1e51764a AB |
1870 | return 0; |
1871 | } | |
1872 | ||
e8b81566 | 1873 | const struct super_operations ubifs_super_operations = { |
1e51764a AB |
1874 | .alloc_inode = ubifs_alloc_inode, |
1875 | .destroy_inode = ubifs_destroy_inode, | |
1876 | .put_super = ubifs_put_super, | |
1877 | .write_inode = ubifs_write_inode, | |
d640e1b5 | 1878 | .evict_inode = ubifs_evict_inode, |
1e51764a AB |
1879 | .statfs = ubifs_statfs, |
1880 | .dirty_inode = ubifs_dirty_inode, | |
1881 | .remount_fs = ubifs_remount_fs, | |
1882 | .show_options = ubifs_show_options, | |
1883 | .sync_fs = ubifs_sync_fs, | |
1884 | }; | |
1885 | ||
1886 | /** | |
1887 | * open_ubi - parse UBI device name string and open the UBI device. | |
1888 | * @name: UBI volume name | |
1889 | * @mode: UBI volume open mode | |
1890 | * | |
9722324e CC |
1891 | * The primary method of mounting UBIFS is by specifying the UBI volume |
1892 | * character device node path. However, UBIFS may also be mounted withoug any | |
1893 | * character device node using one of the following methods: | |
1894 | * | |
1895 | * o ubiX_Y - mount UBI device number X, volume Y; | |
1896 | * o ubiY - mount UBI device number 0, volume Y; | |
1e51764a AB |
1897 | * o ubiX:NAME - mount UBI device X, volume with name NAME; |
1898 | * o ubi:NAME - mount UBI device 0, volume with name NAME. | |
1899 | * | |
1900 | * Alternative '!' separator may be used instead of ':' (because some shells | |
1901 | * like busybox may interpret ':' as an NFS host name separator). This function | |
9722324e CC |
1902 | * returns UBI volume description object in case of success and a negative |
1903 | * error code in case of failure. | |
1e51764a AB |
1904 | */ |
1905 | static struct ubi_volume_desc *open_ubi(const char *name, int mode) | |
1906 | { | |
9722324e | 1907 | struct ubi_volume_desc *ubi; |
1e51764a AB |
1908 | int dev, vol; |
1909 | char *endptr; | |
1910 | ||
9722324e CC |
1911 | /* First, try to open using the device node path method */ |
1912 | ubi = ubi_open_volume_path(name, mode); | |
1913 | if (!IS_ERR(ubi)) | |
1914 | return ubi; | |
1915 | ||
1916 | /* Try the "nodev" method */ | |
1e51764a AB |
1917 | if (name[0] != 'u' || name[1] != 'b' || name[2] != 'i') |
1918 | return ERR_PTR(-EINVAL); | |
1919 | ||
1920 | /* ubi:NAME method */ | |
1921 | if ((name[3] == ':' || name[3] == '!') && name[4] != '\0') | |
1922 | return ubi_open_volume_nm(0, name + 4, mode); | |
1923 | ||
1924 | if (!isdigit(name[3])) | |
1925 | return ERR_PTR(-EINVAL); | |
1926 | ||
1927 | dev = simple_strtoul(name + 3, &endptr, 0); | |
1928 | ||
1929 | /* ubiY method */ | |
1930 | if (*endptr == '\0') | |
1931 | return ubi_open_volume(0, dev, mode); | |
1932 | ||
1933 | /* ubiX_Y method */ | |
1934 | if (*endptr == '_' && isdigit(endptr[1])) { | |
1935 | vol = simple_strtoul(endptr + 1, &endptr, 0); | |
1936 | if (*endptr != '\0') | |
1937 | return ERR_PTR(-EINVAL); | |
1938 | return ubi_open_volume(dev, vol, mode); | |
1939 | } | |
1940 | ||
1941 | /* ubiX:NAME method */ | |
1942 | if ((*endptr == ':' || *endptr == '!') && endptr[1] != '\0') | |
1943 | return ubi_open_volume_nm(dev, ++endptr, mode); | |
1944 | ||
1945 | return ERR_PTR(-EINVAL); | |
1946 | } | |
1947 | ||
b1c27ab3 AV |
1948 | static struct ubifs_info *alloc_ubifs_info(struct ubi_volume_desc *ubi) |
1949 | { | |
1950 | struct ubifs_info *c; | |
1951 | ||
1952 | c = kzalloc(sizeof(struct ubifs_info), GFP_KERNEL); | |
1953 | if (c) { | |
1954 | spin_lock_init(&c->cnt_lock); | |
1955 | spin_lock_init(&c->cs_lock); | |
1956 | spin_lock_init(&c->buds_lock); | |
1957 | spin_lock_init(&c->space_lock); | |
1958 | spin_lock_init(&c->orphan_lock); | |
1959 | init_rwsem(&c->commit_sem); | |
1960 | mutex_init(&c->lp_mutex); | |
1961 | mutex_init(&c->tnc_mutex); | |
1962 | mutex_init(&c->log_mutex); | |
b1c27ab3 AV |
1963 | mutex_init(&c->umount_mutex); |
1964 | mutex_init(&c->bu_mutex); | |
1965 | mutex_init(&c->write_reserve_mutex); | |
1966 | init_waitqueue_head(&c->cmt_wq); | |
1967 | c->buds = RB_ROOT; | |
1968 | c->old_idx = RB_ROOT; | |
1969 | c->size_tree = RB_ROOT; | |
1970 | c->orph_tree = RB_ROOT; | |
1971 | INIT_LIST_HEAD(&c->infos_list); | |
1972 | INIT_LIST_HEAD(&c->idx_gc); | |
1973 | INIT_LIST_HEAD(&c->replay_list); | |
1974 | INIT_LIST_HEAD(&c->replay_buds); | |
1975 | INIT_LIST_HEAD(&c->uncat_list); | |
1976 | INIT_LIST_HEAD(&c->empty_list); | |
1977 | INIT_LIST_HEAD(&c->freeable_list); | |
1978 | INIT_LIST_HEAD(&c->frdi_idx_list); | |
1979 | INIT_LIST_HEAD(&c->unclean_leb_list); | |
1980 | INIT_LIST_HEAD(&c->old_buds); | |
1981 | INIT_LIST_HEAD(&c->orph_list); | |
1982 | INIT_LIST_HEAD(&c->orph_new); | |
1983 | c->no_chk_data_crc = 1; | |
1984 | ||
1985 | c->highest_inum = UBIFS_FIRST_INO; | |
1986 | c->lhead_lnum = c->ltail_lnum = UBIFS_LOG_LNUM; | |
1987 | ||
1988 | ubi_get_volume_info(ubi, &c->vi); | |
1989 | ubi_get_device_info(c->vi.ubi_num, &c->di); | |
1990 | } | |
1991 | return c; | |
1992 | } | |
1993 | ||
1e51764a AB |
1994 | static int ubifs_fill_super(struct super_block *sb, void *data, int silent) |
1995 | { | |
d251ed27 | 1996 | struct ubifs_info *c = sb->s_fs_info; |
1e51764a AB |
1997 | struct inode *root; |
1998 | int err; | |
1999 | ||
8379ea31 | 2000 | c->vfs_sb = sb; |
1e51764a AB |
2001 | /* Re-open the UBI device in read-write mode */ |
2002 | c->ubi = ubi_open_volume(c->vi.ubi_num, c->vi.vol_id, UBI_READWRITE); | |
2003 | if (IS_ERR(c->ubi)) { | |
2004 | err = PTR_ERR(c->ubi); | |
d251ed27 | 2005 | goto out; |
1e51764a AB |
2006 | } |
2007 | ||
2008 | /* | |
0a883a05 | 2009 | * UBIFS provides 'backing_dev_info' in order to disable read-ahead. For |
1e51764a AB |
2010 | * UBIFS, I/O is not deferred, it is done immediately in readpage, |
2011 | * which means the user would have to wait not just for their own I/O | |
0a883a05 | 2012 | * but the read-ahead I/O as well i.e. completely pointless. |
1e51764a AB |
2013 | * |
2014 | * Read-ahead will be disabled because @c->bdi.ra_pages is 0. | |
2015 | */ | |
d993831f | 2016 | c->bdi.name = "ubifs", |
b4caecd4 | 2017 | c->bdi.capabilities = 0; |
1e51764a AB |
2018 | err = bdi_init(&c->bdi); |
2019 | if (err) | |
2020 | goto out_close; | |
7fcd9c3e DM |
2021 | err = bdi_register(&c->bdi, NULL, "ubifs_%d_%d", |
2022 | c->vi.ubi_num, c->vi.vol_id); | |
a979eff1 JA |
2023 | if (err) |
2024 | goto out_bdi; | |
1e51764a AB |
2025 | |
2026 | err = ubifs_parse_options(c, data, 0); | |
2027 | if (err) | |
2028 | goto out_bdi; | |
2029 | ||
32a88aa1 | 2030 | sb->s_bdi = &c->bdi; |
1e51764a AB |
2031 | sb->s_fs_info = c; |
2032 | sb->s_magic = UBIFS_SUPER_MAGIC; | |
2033 | sb->s_blocksize = UBIFS_BLOCK_SIZE; | |
2034 | sb->s_blocksize_bits = UBIFS_BLOCK_SHIFT; | |
1e51764a AB |
2035 | sb->s_maxbytes = c->max_inode_sz = key_max_inode_size(c); |
2036 | if (c->max_inode_sz > MAX_LFS_FILESIZE) | |
2037 | sb->s_maxbytes = c->max_inode_sz = MAX_LFS_FILESIZE; | |
2038 | sb->s_op = &ubifs_super_operations; | |
d7f0b70d | 2039 | sb->s_xattr = ubifs_xattr_handlers; |
1e51764a AB |
2040 | |
2041 | mutex_lock(&c->umount_mutex); | |
2042 | err = mount_ubifs(c); | |
2043 | if (err) { | |
2044 | ubifs_assert(err < 0); | |
2045 | goto out_unlock; | |
2046 | } | |
2047 | ||
2048 | /* Read the root inode */ | |
2049 | root = ubifs_iget(sb, UBIFS_ROOT_INO); | |
2050 | if (IS_ERR(root)) { | |
2051 | err = PTR_ERR(root); | |
2052 | goto out_umount; | |
2053 | } | |
2054 | ||
48fde701 | 2055 | sb->s_root = d_make_root(root); |
7203db97 WY |
2056 | if (!sb->s_root) { |
2057 | err = -ENOMEM; | |
48fde701 | 2058 | goto out_umount; |
7203db97 | 2059 | } |
1e51764a AB |
2060 | |
2061 | mutex_unlock(&c->umount_mutex); | |
1e51764a AB |
2062 | return 0; |
2063 | ||
1e51764a AB |
2064 | out_umount: |
2065 | ubifs_umount(c); | |
2066 | out_unlock: | |
2067 | mutex_unlock(&c->umount_mutex); | |
2068 | out_bdi: | |
2069 | bdi_destroy(&c->bdi); | |
2070 | out_close: | |
2071 | ubi_close_volume(c->ubi); | |
d251ed27 | 2072 | out: |
1e51764a AB |
2073 | return err; |
2074 | } | |
2075 | ||
2076 | static int sb_test(struct super_block *sb, void *data) | |
2077 | { | |
d251ed27 | 2078 | struct ubifs_info *c1 = data; |
7c83f5cb | 2079 | struct ubifs_info *c = sb->s_fs_info; |
1e51764a | 2080 | |
d251ed27 AV |
2081 | return c->vi.cdev == c1->vi.cdev; |
2082 | } | |
2083 | ||
2084 | static int sb_set(struct super_block *sb, void *data) | |
2085 | { | |
2086 | sb->s_fs_info = data; | |
2087 | return set_anon_super(sb, NULL); | |
1e51764a AB |
2088 | } |
2089 | ||
157d81e7 AV |
2090 | static struct dentry *ubifs_mount(struct file_system_type *fs_type, int flags, |
2091 | const char *name, void *data) | |
1e51764a AB |
2092 | { |
2093 | struct ubi_volume_desc *ubi; | |
d251ed27 | 2094 | struct ubifs_info *c; |
1e51764a AB |
2095 | struct super_block *sb; |
2096 | int err; | |
2097 | ||
2098 | dbg_gen("name %s, flags %#x", name, flags); | |
2099 | ||
2100 | /* | |
2101 | * Get UBI device number and volume ID. Mount it read-only so far | |
2102 | * because this might be a new mount point, and UBI allows only one | |
2103 | * read-write user at a time. | |
2104 | */ | |
2105 | ubi = open_ubi(name, UBI_READONLY); | |
2106 | if (IS_ERR(ubi)) { | |
a6aae4dd AB |
2107 | ubifs_err("cannot open \"%s\", error %d", |
2108 | name, (int)PTR_ERR(ubi)); | |
157d81e7 | 2109 | return ERR_CAST(ubi); |
1e51764a | 2110 | } |
1e51764a | 2111 | |
d251ed27 AV |
2112 | c = alloc_ubifs_info(ubi); |
2113 | if (!c) { | |
2114 | err = -ENOMEM; | |
2115 | goto out_close; | |
2116 | } | |
2117 | ||
2118 | dbg_gen("opened ubi%d_%d", c->vi.ubi_num, c->vi.vol_id); | |
1e51764a | 2119 | |
9249e17f | 2120 | sb = sget(fs_type, sb_test, sb_set, flags, c); |
1e51764a AB |
2121 | if (IS_ERR(sb)) { |
2122 | err = PTR_ERR(sb); | |
d251ed27 | 2123 | kfree(c); |
185bf873 | 2124 | goto out_close; |
1e51764a AB |
2125 | } |
2126 | ||
2127 | if (sb->s_root) { | |
2ef13294 | 2128 | struct ubifs_info *c1 = sb->s_fs_info; |
d251ed27 | 2129 | kfree(c); |
1e51764a AB |
2130 | /* A new mount point for already mounted UBIFS */ |
2131 | dbg_gen("this ubi volume is already mounted"); | |
2ef13294 | 2132 | if (!!(flags & MS_RDONLY) != c1->ro_mount) { |
1e51764a AB |
2133 | err = -EBUSY; |
2134 | goto out_deact; | |
2135 | } | |
2136 | } else { | |
1e51764a AB |
2137 | err = ubifs_fill_super(sb, data, flags & MS_SILENT ? 1 : 0); |
2138 | if (err) | |
2139 | goto out_deact; | |
2140 | /* We do not support atime */ | |
2141 | sb->s_flags |= MS_ACTIVE | MS_NOATIME; | |
2142 | } | |
2143 | ||
2144 | /* 'fill_super()' opens ubi again so we must close it here */ | |
2145 | ubi_close_volume(ubi); | |
2146 | ||
157d81e7 | 2147 | return dget(sb->s_root); |
1e51764a AB |
2148 | |
2149 | out_deact: | |
6f5bbff9 | 2150 | deactivate_locked_super(sb); |
1e51764a AB |
2151 | out_close: |
2152 | ubi_close_volume(ubi); | |
157d81e7 | 2153 | return ERR_PTR(err); |
1e51764a AB |
2154 | } |
2155 | ||
d251ed27 AV |
2156 | static void kill_ubifs_super(struct super_block *s) |
2157 | { | |
2158 | struct ubifs_info *c = s->s_fs_info; | |
2159 | kill_anon_super(s); | |
2160 | kfree(c); | |
2161 | } | |
2162 | ||
1e51764a AB |
2163 | static struct file_system_type ubifs_fs_type = { |
2164 | .name = "ubifs", | |
2165 | .owner = THIS_MODULE, | |
157d81e7 | 2166 | .mount = ubifs_mount, |
d251ed27 | 2167 | .kill_sb = kill_ubifs_super, |
1e51764a | 2168 | }; |
7f78e035 | 2169 | MODULE_ALIAS_FS("ubifs"); |
1e51764a AB |
2170 | |
2171 | /* | |
2172 | * Inode slab cache constructor. | |
2173 | */ | |
51cc5068 | 2174 | static void inode_slab_ctor(void *obj) |
1e51764a AB |
2175 | { |
2176 | struct ubifs_inode *ui = obj; | |
2177 | inode_init_once(&ui->vfs_inode); | |
2178 | } | |
2179 | ||
2180 | static int __init ubifs_init(void) | |
2181 | { | |
2182 | int err; | |
2183 | ||
2184 | BUILD_BUG_ON(sizeof(struct ubifs_ch) != 24); | |
2185 | ||
2186 | /* Make sure node sizes are 8-byte aligned */ | |
2187 | BUILD_BUG_ON(UBIFS_CH_SZ & 7); | |
2188 | BUILD_BUG_ON(UBIFS_INO_NODE_SZ & 7); | |
2189 | BUILD_BUG_ON(UBIFS_DENT_NODE_SZ & 7); | |
2190 | BUILD_BUG_ON(UBIFS_XENT_NODE_SZ & 7); | |
2191 | BUILD_BUG_ON(UBIFS_DATA_NODE_SZ & 7); | |
2192 | BUILD_BUG_ON(UBIFS_TRUN_NODE_SZ & 7); | |
2193 | BUILD_BUG_ON(UBIFS_SB_NODE_SZ & 7); | |
2194 | BUILD_BUG_ON(UBIFS_MST_NODE_SZ & 7); | |
2195 | BUILD_BUG_ON(UBIFS_REF_NODE_SZ & 7); | |
2196 | BUILD_BUG_ON(UBIFS_CS_NODE_SZ & 7); | |
2197 | BUILD_BUG_ON(UBIFS_ORPH_NODE_SZ & 7); | |
2198 | ||
2199 | BUILD_BUG_ON(UBIFS_MAX_DENT_NODE_SZ & 7); | |
2200 | BUILD_BUG_ON(UBIFS_MAX_XENT_NODE_SZ & 7); | |
2201 | BUILD_BUG_ON(UBIFS_MAX_DATA_NODE_SZ & 7); | |
2202 | BUILD_BUG_ON(UBIFS_MAX_INO_NODE_SZ & 7); | |
2203 | BUILD_BUG_ON(UBIFS_MAX_NODE_SZ & 7); | |
2204 | BUILD_BUG_ON(MIN_WRITE_SZ & 7); | |
2205 | ||
2206 | /* Check min. node size */ | |
2207 | BUILD_BUG_ON(UBIFS_INO_NODE_SZ < MIN_WRITE_SZ); | |
2208 | BUILD_BUG_ON(UBIFS_DENT_NODE_SZ < MIN_WRITE_SZ); | |
2209 | BUILD_BUG_ON(UBIFS_XENT_NODE_SZ < MIN_WRITE_SZ); | |
2210 | BUILD_BUG_ON(UBIFS_TRUN_NODE_SZ < MIN_WRITE_SZ); | |
2211 | ||
2212 | BUILD_BUG_ON(UBIFS_MAX_DENT_NODE_SZ > UBIFS_MAX_NODE_SZ); | |
2213 | BUILD_BUG_ON(UBIFS_MAX_XENT_NODE_SZ > UBIFS_MAX_NODE_SZ); | |
2214 | BUILD_BUG_ON(UBIFS_MAX_DATA_NODE_SZ > UBIFS_MAX_NODE_SZ); | |
2215 | BUILD_BUG_ON(UBIFS_MAX_INO_NODE_SZ > UBIFS_MAX_NODE_SZ); | |
2216 | ||
2217 | /* Defined node sizes */ | |
2218 | BUILD_BUG_ON(UBIFS_SB_NODE_SZ != 4096); | |
2219 | BUILD_BUG_ON(UBIFS_MST_NODE_SZ != 512); | |
2220 | BUILD_BUG_ON(UBIFS_INO_NODE_SZ != 160); | |
2221 | BUILD_BUG_ON(UBIFS_REF_NODE_SZ != 64); | |
2222 | ||
a1dc080c AB |
2223 | /* |
2224 | * We use 2 bit wide bit-fields to store compression type, which should | |
2225 | * be amended if more compressors are added. The bit-fields are: | |
553dea4d AB |
2226 | * @compr_type in 'struct ubifs_inode', @default_compr in |
2227 | * 'struct ubifs_info' and @compr_type in 'struct ubifs_mount_opts'. | |
a1dc080c AB |
2228 | */ |
2229 | BUILD_BUG_ON(UBIFS_COMPR_TYPES_CNT > 4); | |
2230 | ||
1e51764a AB |
2231 | /* |
2232 | * We require that PAGE_CACHE_SIZE is greater-than-or-equal-to | |
2233 | * UBIFS_BLOCK_SIZE. It is assumed that both are powers of 2. | |
2234 | */ | |
2235 | if (PAGE_CACHE_SIZE < UBIFS_BLOCK_SIZE) { | |
79fda517 | 2236 | ubifs_err("VFS page cache size is %u bytes, but UBIFS requires at least 4096 bytes", |
1e51764a AB |
2237 | (unsigned int)PAGE_CACHE_SIZE); |
2238 | return -EINVAL; | |
2239 | } | |
2240 | ||
1e51764a AB |
2241 | ubifs_inode_slab = kmem_cache_create("ubifs_inode_slab", |
2242 | sizeof(struct ubifs_inode), 0, | |
2243 | SLAB_MEM_SPREAD | SLAB_RECLAIM_ACCOUNT, | |
2244 | &inode_slab_ctor); | |
2245 | if (!ubifs_inode_slab) | |
5cc361e3 | 2246 | return -ENOMEM; |
1e51764a AB |
2247 | |
2248 | register_shrinker(&ubifs_shrinker_info); | |
2249 | ||
2250 | err = ubifs_compressors_init(); | |
552ff317 AB |
2251 | if (err) |
2252 | goto out_shrinker; | |
2253 | ||
2254 | err = dbg_debugfs_init(); | |
1e51764a AB |
2255 | if (err) |
2256 | goto out_compr; | |
2257 | ||
5cc361e3 AV |
2258 | err = register_filesystem(&ubifs_fs_type); |
2259 | if (err) { | |
2260 | ubifs_err("cannot register file system, error %d", err); | |
2261 | goto out_dbg; | |
2262 | } | |
1e51764a AB |
2263 | return 0; |
2264 | ||
5cc361e3 AV |
2265 | out_dbg: |
2266 | dbg_debugfs_exit(); | |
1e51764a | 2267 | out_compr: |
552ff317 AB |
2268 | ubifs_compressors_exit(); |
2269 | out_shrinker: | |
1e51764a AB |
2270 | unregister_shrinker(&ubifs_shrinker_info); |
2271 | kmem_cache_destroy(ubifs_inode_slab); | |
1e51764a AB |
2272 | return err; |
2273 | } | |
2274 | /* late_initcall to let compressors initialize first */ | |
2275 | late_initcall(ubifs_init); | |
2276 | ||
2277 | static void __exit ubifs_exit(void) | |
2278 | { | |
2279 | ubifs_assert(list_empty(&ubifs_infos)); | |
2280 | ubifs_assert(atomic_long_read(&ubifs_clean_zn_cnt) == 0); | |
2281 | ||
552ff317 | 2282 | dbg_debugfs_exit(); |
1e51764a AB |
2283 | ubifs_compressors_exit(); |
2284 | unregister_shrinker(&ubifs_shrinker_info); | |
8c0a8537 KS |
2285 | |
2286 | /* | |
2287 | * Make sure all delayed rcu free inodes are flushed before we | |
2288 | * destroy cache. | |
2289 | */ | |
2290 | rcu_barrier(); | |
1e51764a AB |
2291 | kmem_cache_destroy(ubifs_inode_slab); |
2292 | unregister_filesystem(&ubifs_fs_type); | |
2293 | } | |
2294 | module_exit(ubifs_exit); | |
2295 | ||
2296 | MODULE_LICENSE("GPL"); | |
2297 | MODULE_VERSION(__stringify(UBIFS_VERSION)); | |
2298 | MODULE_AUTHOR("Artem Bityutskiy, Adrian Hunter"); | |
2299 | MODULE_DESCRIPTION("UBIFS - UBI File System"); |