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1e51764a AB |
1 | /* |
2 | * This file is part of UBIFS. | |
3 | * | |
4 | * Copyright (C) 2006-2008 Nokia Corporation. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License version 2 as published by | |
8 | * the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
13 | * more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License along with | |
16 | * this program; if not, write to the Free Software Foundation, Inc., 51 | |
17 | * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
18 | * | |
19 | * Authors: Artem Bityutskiy (Битюцкий Артём) | |
20 | * Adrian Hunter | |
21 | */ | |
22 | ||
23 | /* | |
24 | * This file implements UBIFS initialization and VFS superblock operations. Some | |
25 | * initialization stuff which is rather large and complex is placed at | |
26 | * corresponding subsystems, but most of it is here. | |
27 | */ | |
28 | ||
29 | #include <linux/init.h> | |
30 | #include <linux/slab.h> | |
31 | #include <linux/module.h> | |
32 | #include <linux/ctype.h> | |
1e51764a AB |
33 | #include <linux/kthread.h> |
34 | #include <linux/parser.h> | |
35 | #include <linux/seq_file.h> | |
36 | #include <linux/mount.h> | |
4d61db4f | 37 | #include <linux/math64.h> |
304d427c | 38 | #include <linux/writeback.h> |
1e51764a AB |
39 | #include "ubifs.h" |
40 | ||
39ce81ce AB |
41 | /* |
42 | * Maximum amount of memory we may 'kmalloc()' without worrying that we are | |
43 | * allocating too much. | |
44 | */ | |
45 | #define UBIFS_KMALLOC_OK (128*1024) | |
46 | ||
1e51764a AB |
47 | /* Slab cache for UBIFS inodes */ |
48 | struct kmem_cache *ubifs_inode_slab; | |
49 | ||
50 | /* UBIFS TNC shrinker description */ | |
51 | static struct shrinker ubifs_shrinker_info = { | |
52 | .shrink = ubifs_shrinker, | |
53 | .seeks = DEFAULT_SEEKS, | |
54 | }; | |
55 | ||
56 | /** | |
57 | * validate_inode - validate inode. | |
58 | * @c: UBIFS file-system description object | |
59 | * @inode: the inode to validate | |
60 | * | |
61 | * This is a helper function for 'ubifs_iget()' which validates various fields | |
62 | * of a newly built inode to make sure they contain sane values and prevent | |
63 | * possible vulnerabilities. Returns zero if the inode is all right and | |
64 | * a non-zero error code if not. | |
65 | */ | |
66 | static int validate_inode(struct ubifs_info *c, const struct inode *inode) | |
67 | { | |
68 | int err; | |
69 | const struct ubifs_inode *ui = ubifs_inode(inode); | |
70 | ||
71 | if (inode->i_size > c->max_inode_sz) { | |
72 | ubifs_err("inode is too large (%lld)", | |
73 | (long long)inode->i_size); | |
74 | return 1; | |
75 | } | |
76 | ||
77 | if (ui->compr_type < 0 || ui->compr_type >= UBIFS_COMPR_TYPES_CNT) { | |
78 | ubifs_err("unknown compression type %d", ui->compr_type); | |
79 | return 2; | |
80 | } | |
81 | ||
82 | if (ui->xattr_names + ui->xattr_cnt > XATTR_LIST_MAX) | |
83 | return 3; | |
84 | ||
85 | if (ui->data_len < 0 || ui->data_len > UBIFS_MAX_INO_DATA) | |
86 | return 4; | |
87 | ||
88 | if (ui->xattr && (inode->i_mode & S_IFMT) != S_IFREG) | |
89 | return 5; | |
90 | ||
91 | if (!ubifs_compr_present(ui->compr_type)) { | |
92 | ubifs_warn("inode %lu uses '%s' compression, but it was not " | |
93 | "compiled in", inode->i_ino, | |
94 | ubifs_compr_name(ui->compr_type)); | |
95 | } | |
96 | ||
97 | err = dbg_check_dir_size(c, inode); | |
98 | return err; | |
99 | } | |
100 | ||
101 | struct inode *ubifs_iget(struct super_block *sb, unsigned long inum) | |
102 | { | |
103 | int err; | |
104 | union ubifs_key key; | |
105 | struct ubifs_ino_node *ino; | |
106 | struct ubifs_info *c = sb->s_fs_info; | |
107 | struct inode *inode; | |
108 | struct ubifs_inode *ui; | |
109 | ||
110 | dbg_gen("inode %lu", inum); | |
111 | ||
112 | inode = iget_locked(sb, inum); | |
113 | if (!inode) | |
114 | return ERR_PTR(-ENOMEM); | |
115 | if (!(inode->i_state & I_NEW)) | |
116 | return inode; | |
117 | ui = ubifs_inode(inode); | |
118 | ||
119 | ino = kmalloc(UBIFS_MAX_INO_NODE_SZ, GFP_NOFS); | |
120 | if (!ino) { | |
121 | err = -ENOMEM; | |
122 | goto out; | |
123 | } | |
124 | ||
125 | ino_key_init(c, &key, inode->i_ino); | |
126 | ||
127 | err = ubifs_tnc_lookup(c, &key, ino); | |
128 | if (err) | |
129 | goto out_ino; | |
130 | ||
131 | inode->i_flags |= (S_NOCMTIME | S_NOATIME); | |
132 | inode->i_nlink = le32_to_cpu(ino->nlink); | |
133 | inode->i_uid = le32_to_cpu(ino->uid); | |
134 | inode->i_gid = le32_to_cpu(ino->gid); | |
135 | inode->i_atime.tv_sec = (int64_t)le64_to_cpu(ino->atime_sec); | |
136 | inode->i_atime.tv_nsec = le32_to_cpu(ino->atime_nsec); | |
137 | inode->i_mtime.tv_sec = (int64_t)le64_to_cpu(ino->mtime_sec); | |
138 | inode->i_mtime.tv_nsec = le32_to_cpu(ino->mtime_nsec); | |
139 | inode->i_ctime.tv_sec = (int64_t)le64_to_cpu(ino->ctime_sec); | |
140 | inode->i_ctime.tv_nsec = le32_to_cpu(ino->ctime_nsec); | |
141 | inode->i_mode = le32_to_cpu(ino->mode); | |
142 | inode->i_size = le64_to_cpu(ino->size); | |
143 | ||
144 | ui->data_len = le32_to_cpu(ino->data_len); | |
145 | ui->flags = le32_to_cpu(ino->flags); | |
146 | ui->compr_type = le16_to_cpu(ino->compr_type); | |
147 | ui->creat_sqnum = le64_to_cpu(ino->creat_sqnum); | |
148 | ui->xattr_cnt = le32_to_cpu(ino->xattr_cnt); | |
149 | ui->xattr_size = le32_to_cpu(ino->xattr_size); | |
150 | ui->xattr_names = le32_to_cpu(ino->xattr_names); | |
151 | ui->synced_i_size = ui->ui_size = inode->i_size; | |
152 | ||
153 | ui->xattr = (ui->flags & UBIFS_XATTR_FL) ? 1 : 0; | |
154 | ||
155 | err = validate_inode(c, inode); | |
156 | if (err) | |
157 | goto out_invalid; | |
158 | ||
0a883a05 | 159 | /* Disable read-ahead */ |
1e51764a AB |
160 | inode->i_mapping->backing_dev_info = &c->bdi; |
161 | ||
162 | switch (inode->i_mode & S_IFMT) { | |
163 | case S_IFREG: | |
164 | inode->i_mapping->a_ops = &ubifs_file_address_operations; | |
165 | inode->i_op = &ubifs_file_inode_operations; | |
166 | inode->i_fop = &ubifs_file_operations; | |
167 | if (ui->xattr) { | |
168 | ui->data = kmalloc(ui->data_len + 1, GFP_NOFS); | |
169 | if (!ui->data) { | |
170 | err = -ENOMEM; | |
171 | goto out_ino; | |
172 | } | |
173 | memcpy(ui->data, ino->data, ui->data_len); | |
174 | ((char *)ui->data)[ui->data_len] = '\0'; | |
175 | } else if (ui->data_len != 0) { | |
176 | err = 10; | |
177 | goto out_invalid; | |
178 | } | |
179 | break; | |
180 | case S_IFDIR: | |
181 | inode->i_op = &ubifs_dir_inode_operations; | |
182 | inode->i_fop = &ubifs_dir_operations; | |
183 | if (ui->data_len != 0) { | |
184 | err = 11; | |
185 | goto out_invalid; | |
186 | } | |
187 | break; | |
188 | case S_IFLNK: | |
189 | inode->i_op = &ubifs_symlink_inode_operations; | |
190 | if (ui->data_len <= 0 || ui->data_len > UBIFS_MAX_INO_DATA) { | |
191 | err = 12; | |
192 | goto out_invalid; | |
193 | } | |
194 | ui->data = kmalloc(ui->data_len + 1, GFP_NOFS); | |
195 | if (!ui->data) { | |
196 | err = -ENOMEM; | |
197 | goto out_ino; | |
198 | } | |
199 | memcpy(ui->data, ino->data, ui->data_len); | |
200 | ((char *)ui->data)[ui->data_len] = '\0'; | |
201 | break; | |
202 | case S_IFBLK: | |
203 | case S_IFCHR: | |
204 | { | |
205 | dev_t rdev; | |
206 | union ubifs_dev_desc *dev; | |
207 | ||
208 | ui->data = kmalloc(sizeof(union ubifs_dev_desc), GFP_NOFS); | |
209 | if (!ui->data) { | |
210 | err = -ENOMEM; | |
211 | goto out_ino; | |
212 | } | |
213 | ||
214 | dev = (union ubifs_dev_desc *)ino->data; | |
215 | if (ui->data_len == sizeof(dev->new)) | |
216 | rdev = new_decode_dev(le32_to_cpu(dev->new)); | |
217 | else if (ui->data_len == sizeof(dev->huge)) | |
218 | rdev = huge_decode_dev(le64_to_cpu(dev->huge)); | |
219 | else { | |
220 | err = 13; | |
221 | goto out_invalid; | |
222 | } | |
223 | memcpy(ui->data, ino->data, ui->data_len); | |
224 | inode->i_op = &ubifs_file_inode_operations; | |
225 | init_special_inode(inode, inode->i_mode, rdev); | |
226 | break; | |
227 | } | |
228 | case S_IFSOCK: | |
229 | case S_IFIFO: | |
230 | inode->i_op = &ubifs_file_inode_operations; | |
231 | init_special_inode(inode, inode->i_mode, 0); | |
232 | if (ui->data_len != 0) { | |
233 | err = 14; | |
234 | goto out_invalid; | |
235 | } | |
236 | break; | |
237 | default: | |
238 | err = 15; | |
239 | goto out_invalid; | |
240 | } | |
241 | ||
242 | kfree(ino); | |
243 | ubifs_set_inode_flags(inode); | |
244 | unlock_new_inode(inode); | |
245 | return inode; | |
246 | ||
247 | out_invalid: | |
248 | ubifs_err("inode %lu validation failed, error %d", inode->i_ino, err); | |
249 | dbg_dump_node(c, ino); | |
250 | dbg_dump_inode(c, inode); | |
251 | err = -EINVAL; | |
252 | out_ino: | |
253 | kfree(ino); | |
254 | out: | |
255 | ubifs_err("failed to read inode %lu, error %d", inode->i_ino, err); | |
256 | iget_failed(inode); | |
257 | return ERR_PTR(err); | |
258 | } | |
259 | ||
260 | static struct inode *ubifs_alloc_inode(struct super_block *sb) | |
261 | { | |
262 | struct ubifs_inode *ui; | |
263 | ||
264 | ui = kmem_cache_alloc(ubifs_inode_slab, GFP_NOFS); | |
265 | if (!ui) | |
266 | return NULL; | |
267 | ||
268 | memset((void *)ui + sizeof(struct inode), 0, | |
269 | sizeof(struct ubifs_inode) - sizeof(struct inode)); | |
270 | mutex_init(&ui->ui_mutex); | |
271 | spin_lock_init(&ui->ui_lock); | |
272 | return &ui->vfs_inode; | |
273 | }; | |
274 | ||
275 | static void ubifs_destroy_inode(struct inode *inode) | |
276 | { | |
277 | struct ubifs_inode *ui = ubifs_inode(inode); | |
278 | ||
279 | kfree(ui->data); | |
280 | kmem_cache_free(ubifs_inode_slab, inode); | |
281 | } | |
282 | ||
283 | /* | |
284 | * Note, Linux write-back code calls this without 'i_mutex'. | |
285 | */ | |
a9185b41 | 286 | static int ubifs_write_inode(struct inode *inode, struct writeback_control *wbc) |
1e51764a | 287 | { |
fbfa6c88 | 288 | int err = 0; |
1e51764a AB |
289 | struct ubifs_info *c = inode->i_sb->s_fs_info; |
290 | struct ubifs_inode *ui = ubifs_inode(inode); | |
291 | ||
292 | ubifs_assert(!ui->xattr); | |
293 | if (is_bad_inode(inode)) | |
294 | return 0; | |
295 | ||
296 | mutex_lock(&ui->ui_mutex); | |
297 | /* | |
298 | * Due to races between write-back forced by budgeting | |
299 | * (see 'sync_some_inodes()') and pdflush write-back, the inode may | |
300 | * have already been synchronized, do not do this again. This might | |
301 | * also happen if it was synchronized in an VFS operation, e.g. | |
302 | * 'ubifs_link()'. | |
303 | */ | |
304 | if (!ui->dirty) { | |
305 | mutex_unlock(&ui->ui_mutex); | |
306 | return 0; | |
307 | } | |
308 | ||
fbfa6c88 AB |
309 | /* |
310 | * As an optimization, do not write orphan inodes to the media just | |
311 | * because this is not needed. | |
312 | */ | |
313 | dbg_gen("inode %lu, mode %#x, nlink %u", | |
314 | inode->i_ino, (int)inode->i_mode, inode->i_nlink); | |
315 | if (inode->i_nlink) { | |
1f28681a | 316 | err = ubifs_jnl_write_inode(c, inode); |
fbfa6c88 AB |
317 | if (err) |
318 | ubifs_err("can't write inode %lu, error %d", | |
319 | inode->i_ino, err); | |
e3c3efc2 AB |
320 | else |
321 | err = dbg_check_inode_size(c, inode, ui->ui_size); | |
fbfa6c88 | 322 | } |
1e51764a AB |
323 | |
324 | ui->dirty = 0; | |
325 | mutex_unlock(&ui->ui_mutex); | |
326 | ubifs_release_dirty_inode_budget(c, ui); | |
327 | return err; | |
328 | } | |
329 | ||
330 | static void ubifs_delete_inode(struct inode *inode) | |
331 | { | |
332 | int err; | |
333 | struct ubifs_info *c = inode->i_sb->s_fs_info; | |
1e0f358e | 334 | struct ubifs_inode *ui = ubifs_inode(inode); |
1e51764a | 335 | |
1e0f358e | 336 | if (ui->xattr) |
1e51764a AB |
337 | /* |
338 | * Extended attribute inode deletions are fully handled in | |
339 | * 'ubifs_removexattr()'. These inodes are special and have | |
340 | * limited usage, so there is nothing to do here. | |
341 | */ | |
342 | goto out; | |
343 | ||
7d32c2bb | 344 | dbg_gen("inode %lu, mode %#x", inode->i_ino, (int)inode->i_mode); |
1e51764a AB |
345 | ubifs_assert(!atomic_read(&inode->i_count)); |
346 | ubifs_assert(inode->i_nlink == 0); | |
347 | ||
348 | truncate_inode_pages(&inode->i_data, 0); | |
349 | if (is_bad_inode(inode)) | |
350 | goto out; | |
351 | ||
1e0f358e | 352 | ui->ui_size = inode->i_size = 0; |
de94eb55 | 353 | err = ubifs_jnl_delete_inode(c, inode); |
1e51764a AB |
354 | if (err) |
355 | /* | |
356 | * Worst case we have a lost orphan inode wasting space, so a | |
0a883a05 | 357 | * simple error message is OK here. |
1e51764a | 358 | */ |
de94eb55 AB |
359 | ubifs_err("can't delete inode %lu, error %d", |
360 | inode->i_ino, err); | |
361 | ||
1e51764a | 362 | out: |
1e0f358e AB |
363 | if (ui->dirty) |
364 | ubifs_release_dirty_inode_budget(c, ui); | |
6d6cb0d6 AH |
365 | else { |
366 | /* We've deleted something - clean the "no space" flags */ | |
367 | c->nospace = c->nospace_rp = 0; | |
368 | smp_wmb(); | |
369 | } | |
1e51764a AB |
370 | clear_inode(inode); |
371 | } | |
372 | ||
373 | static void ubifs_dirty_inode(struct inode *inode) | |
374 | { | |
375 | struct ubifs_inode *ui = ubifs_inode(inode); | |
376 | ||
377 | ubifs_assert(mutex_is_locked(&ui->ui_mutex)); | |
378 | if (!ui->dirty) { | |
379 | ui->dirty = 1; | |
380 | dbg_gen("inode %lu", inode->i_ino); | |
381 | } | |
382 | } | |
383 | ||
384 | static int ubifs_statfs(struct dentry *dentry, struct kstatfs *buf) | |
385 | { | |
386 | struct ubifs_info *c = dentry->d_sb->s_fs_info; | |
387 | unsigned long long free; | |
7c7cbadf | 388 | __le32 *uuid = (__le32 *)c->uuid; |
1e51764a | 389 | |
7dad181b | 390 | free = ubifs_get_free_space(c); |
1e51764a AB |
391 | dbg_gen("free space %lld bytes (%lld blocks)", |
392 | free, free >> UBIFS_BLOCK_SHIFT); | |
393 | ||
394 | buf->f_type = UBIFS_SUPER_MAGIC; | |
395 | buf->f_bsize = UBIFS_BLOCK_SIZE; | |
396 | buf->f_blocks = c->block_cnt; | |
397 | buf->f_bfree = free >> UBIFS_BLOCK_SHIFT; | |
398 | if (free > c->report_rp_size) | |
399 | buf->f_bavail = (free - c->report_rp_size) >> UBIFS_BLOCK_SHIFT; | |
400 | else | |
401 | buf->f_bavail = 0; | |
402 | buf->f_files = 0; | |
403 | buf->f_ffree = 0; | |
404 | buf->f_namelen = UBIFS_MAX_NLEN; | |
7c7cbadf AB |
405 | buf->f_fsid.val[0] = le32_to_cpu(uuid[0]) ^ le32_to_cpu(uuid[2]); |
406 | buf->f_fsid.val[1] = le32_to_cpu(uuid[1]) ^ le32_to_cpu(uuid[3]); | |
b4978e94 | 407 | ubifs_assert(buf->f_bfree <= c->block_cnt); |
1e51764a AB |
408 | return 0; |
409 | } | |
410 | ||
411 | static int ubifs_show_options(struct seq_file *s, struct vfsmount *mnt) | |
412 | { | |
413 | struct ubifs_info *c = mnt->mnt_sb->s_fs_info; | |
414 | ||
415 | if (c->mount_opts.unmount_mode == 2) | |
416 | seq_printf(s, ",fast_unmount"); | |
417 | else if (c->mount_opts.unmount_mode == 1) | |
418 | seq_printf(s, ",norm_unmount"); | |
419 | ||
4793e7c5 AH |
420 | if (c->mount_opts.bulk_read == 2) |
421 | seq_printf(s, ",bulk_read"); | |
422 | else if (c->mount_opts.bulk_read == 1) | |
423 | seq_printf(s, ",no_bulk_read"); | |
424 | ||
2953e73f AH |
425 | if (c->mount_opts.chk_data_crc == 2) |
426 | seq_printf(s, ",chk_data_crc"); | |
427 | else if (c->mount_opts.chk_data_crc == 1) | |
428 | seq_printf(s, ",no_chk_data_crc"); | |
429 | ||
553dea4d | 430 | if (c->mount_opts.override_compr) { |
fcabb347 HA |
431 | seq_printf(s, ",compr=%s", |
432 | ubifs_compr_name(c->mount_opts.compr_type)); | |
553dea4d AB |
433 | } |
434 | ||
1e51764a AB |
435 | return 0; |
436 | } | |
437 | ||
438 | static int ubifs_sync_fs(struct super_block *sb, int wait) | |
439 | { | |
f1038300 | 440 | int i, err; |
1e51764a | 441 | struct ubifs_info *c = sb->s_fs_info; |
304d427c | 442 | |
e8ea1759 | 443 | /* |
dedb0d48 AB |
444 | * Zero @wait is just an advisory thing to help the file system shove |
445 | * lots of data into the queues, and there will be the second | |
e8ea1759 AB |
446 | * '->sync_fs()' call, with non-zero @wait. |
447 | */ | |
dedb0d48 AB |
448 | if (!wait) |
449 | return 0; | |
e8ea1759 | 450 | |
3eb14297 AH |
451 | /* |
452 | * Synchronize write buffers, because 'ubifs_run_commit()' does not | |
453 | * do this if it waits for an already running commit. | |
454 | */ | |
455 | for (i = 0; i < c->jhead_cnt; i++) { | |
456 | err = ubifs_wbuf_sync(&c->jheads[i].wbuf); | |
457 | if (err) | |
458 | return err; | |
459 | } | |
460 | ||
887ee171 AB |
461 | /* |
462 | * Strictly speaking, it is not necessary to commit the journal here, | |
463 | * synchronizing write-buffers would be enough. But committing makes | |
464 | * UBIFS free space predictions much more accurate, so we want to let | |
465 | * the user be able to get more accurate results of 'statfs()' after | |
466 | * they synchronize the file system. | |
467 | */ | |
f1038300 AB |
468 | err = ubifs_run_commit(c); |
469 | if (err) | |
470 | return err; | |
403e12ab | 471 | |
cb5c6a2b | 472 | return ubi_sync(c->vi.ubi_num); |
1e51764a AB |
473 | } |
474 | ||
475 | /** | |
476 | * init_constants_early - initialize UBIFS constants. | |
477 | * @c: UBIFS file-system description object | |
478 | * | |
479 | * This function initialize UBIFS constants which do not need the superblock to | |
480 | * be read. It also checks that the UBI volume satisfies basic UBIFS | |
481 | * requirements. Returns zero in case of success and a negative error code in | |
482 | * case of failure. | |
483 | */ | |
484 | static int init_constants_early(struct ubifs_info *c) | |
485 | { | |
486 | if (c->vi.corrupted) { | |
487 | ubifs_warn("UBI volume is corrupted - read-only mode"); | |
488 | c->ro_media = 1; | |
489 | } | |
490 | ||
491 | if (c->di.ro_mode) { | |
492 | ubifs_msg("read-only UBI device"); | |
493 | c->ro_media = 1; | |
494 | } | |
495 | ||
496 | if (c->vi.vol_type == UBI_STATIC_VOLUME) { | |
497 | ubifs_msg("static UBI volume - read-only mode"); | |
498 | c->ro_media = 1; | |
499 | } | |
500 | ||
501 | c->leb_cnt = c->vi.size; | |
502 | c->leb_size = c->vi.usable_leb_size; | |
503 | c->half_leb_size = c->leb_size / 2; | |
504 | c->min_io_size = c->di.min_io_size; | |
505 | c->min_io_shift = fls(c->min_io_size) - 1; | |
506 | ||
507 | if (c->leb_size < UBIFS_MIN_LEB_SZ) { | |
508 | ubifs_err("too small LEBs (%d bytes), min. is %d bytes", | |
509 | c->leb_size, UBIFS_MIN_LEB_SZ); | |
510 | return -EINVAL; | |
511 | } | |
512 | ||
513 | if (c->leb_cnt < UBIFS_MIN_LEB_CNT) { | |
514 | ubifs_err("too few LEBs (%d), min. is %d", | |
515 | c->leb_cnt, UBIFS_MIN_LEB_CNT); | |
516 | return -EINVAL; | |
517 | } | |
518 | ||
519 | if (!is_power_of_2(c->min_io_size)) { | |
520 | ubifs_err("bad min. I/O size %d", c->min_io_size); | |
521 | return -EINVAL; | |
522 | } | |
523 | ||
524 | /* | |
525 | * UBIFS aligns all node to 8-byte boundary, so to make function in | |
526 | * io.c simpler, assume minimum I/O unit size to be 8 bytes if it is | |
527 | * less than 8. | |
528 | */ | |
529 | if (c->min_io_size < 8) { | |
530 | c->min_io_size = 8; | |
531 | c->min_io_shift = 3; | |
532 | } | |
533 | ||
534 | c->ref_node_alsz = ALIGN(UBIFS_REF_NODE_SZ, c->min_io_size); | |
535 | c->mst_node_alsz = ALIGN(UBIFS_MST_NODE_SZ, c->min_io_size); | |
536 | ||
537 | /* | |
538 | * Initialize node length ranges which are mostly needed for node | |
539 | * length validation. | |
540 | */ | |
541 | c->ranges[UBIFS_PAD_NODE].len = UBIFS_PAD_NODE_SZ; | |
542 | c->ranges[UBIFS_SB_NODE].len = UBIFS_SB_NODE_SZ; | |
543 | c->ranges[UBIFS_MST_NODE].len = UBIFS_MST_NODE_SZ; | |
544 | c->ranges[UBIFS_REF_NODE].len = UBIFS_REF_NODE_SZ; | |
545 | c->ranges[UBIFS_TRUN_NODE].len = UBIFS_TRUN_NODE_SZ; | |
546 | c->ranges[UBIFS_CS_NODE].len = UBIFS_CS_NODE_SZ; | |
547 | ||
548 | c->ranges[UBIFS_INO_NODE].min_len = UBIFS_INO_NODE_SZ; | |
549 | c->ranges[UBIFS_INO_NODE].max_len = UBIFS_MAX_INO_NODE_SZ; | |
550 | c->ranges[UBIFS_ORPH_NODE].min_len = | |
551 | UBIFS_ORPH_NODE_SZ + sizeof(__le64); | |
552 | c->ranges[UBIFS_ORPH_NODE].max_len = c->leb_size; | |
553 | c->ranges[UBIFS_DENT_NODE].min_len = UBIFS_DENT_NODE_SZ; | |
554 | c->ranges[UBIFS_DENT_NODE].max_len = UBIFS_MAX_DENT_NODE_SZ; | |
555 | c->ranges[UBIFS_XENT_NODE].min_len = UBIFS_XENT_NODE_SZ; | |
556 | c->ranges[UBIFS_XENT_NODE].max_len = UBIFS_MAX_XENT_NODE_SZ; | |
557 | c->ranges[UBIFS_DATA_NODE].min_len = UBIFS_DATA_NODE_SZ; | |
558 | c->ranges[UBIFS_DATA_NODE].max_len = UBIFS_MAX_DATA_NODE_SZ; | |
559 | /* | |
560 | * Minimum indexing node size is amended later when superblock is | |
561 | * read and the key length is known. | |
562 | */ | |
563 | c->ranges[UBIFS_IDX_NODE].min_len = UBIFS_IDX_NODE_SZ + UBIFS_BRANCH_SZ; | |
564 | /* | |
565 | * Maximum indexing node size is amended later when superblock is | |
566 | * read and the fanout is known. | |
567 | */ | |
568 | c->ranges[UBIFS_IDX_NODE].max_len = INT_MAX; | |
569 | ||
570 | /* | |
7078202e AB |
571 | * Initialize dead and dark LEB space watermarks. See gc.c for comments |
572 | * about these values. | |
1e51764a AB |
573 | */ |
574 | c->dead_wm = ALIGN(MIN_WRITE_SZ, c->min_io_size); | |
575 | c->dark_wm = ALIGN(UBIFS_MAX_NODE_SZ, c->min_io_size); | |
576 | ||
9bbb5726 AB |
577 | /* |
578 | * Calculate how many bytes would be wasted at the end of LEB if it was | |
579 | * fully filled with data nodes of maximum size. This is used in | |
580 | * calculations when reporting free space. | |
581 | */ | |
582 | c->leb_overhead = c->leb_size % UBIFS_MAX_DATA_NODE_SZ; | |
39ce81ce | 583 | |
4793e7c5 | 584 | /* Buffer size for bulk-reads */ |
6c0c42cd AB |
585 | c->max_bu_buf_len = UBIFS_MAX_BULK_READ * UBIFS_MAX_DATA_NODE_SZ; |
586 | if (c->max_bu_buf_len > c->leb_size) | |
587 | c->max_bu_buf_len = c->leb_size; | |
1e51764a AB |
588 | return 0; |
589 | } | |
590 | ||
591 | /** | |
592 | * bud_wbuf_callback - bud LEB write-buffer synchronization call-back. | |
593 | * @c: UBIFS file-system description object | |
594 | * @lnum: LEB the write-buffer was synchronized to | |
595 | * @free: how many free bytes left in this LEB | |
596 | * @pad: how many bytes were padded | |
597 | * | |
598 | * This is a callback function which is called by the I/O unit when the | |
599 | * write-buffer is synchronized. We need this to correctly maintain space | |
600 | * accounting in bud logical eraseblocks. This function returns zero in case of | |
601 | * success and a negative error code in case of failure. | |
602 | * | |
603 | * This function actually belongs to the journal, but we keep it here because | |
604 | * we want to keep it static. | |
605 | */ | |
606 | static int bud_wbuf_callback(struct ubifs_info *c, int lnum, int free, int pad) | |
607 | { | |
608 | return ubifs_update_one_lp(c, lnum, free, pad, 0, 0); | |
609 | } | |
610 | ||
611 | /* | |
79807d07 | 612 | * init_constants_sb - initialize UBIFS constants. |
1e51764a AB |
613 | * @c: UBIFS file-system description object |
614 | * | |
615 | * This is a helper function which initializes various UBIFS constants after | |
616 | * the superblock has been read. It also checks various UBIFS parameters and | |
617 | * makes sure they are all right. Returns zero in case of success and a | |
618 | * negative error code in case of failure. | |
619 | */ | |
79807d07 | 620 | static int init_constants_sb(struct ubifs_info *c) |
1e51764a AB |
621 | { |
622 | int tmp, err; | |
4d61db4f | 623 | long long tmp64; |
1e51764a AB |
624 | |
625 | c->main_bytes = (long long)c->main_lebs * c->leb_size; | |
626 | c->max_znode_sz = sizeof(struct ubifs_znode) + | |
627 | c->fanout * sizeof(struct ubifs_zbranch); | |
628 | ||
629 | tmp = ubifs_idx_node_sz(c, 1); | |
630 | c->ranges[UBIFS_IDX_NODE].min_len = tmp; | |
631 | c->min_idx_node_sz = ALIGN(tmp, 8); | |
632 | ||
633 | tmp = ubifs_idx_node_sz(c, c->fanout); | |
634 | c->ranges[UBIFS_IDX_NODE].max_len = tmp; | |
635 | c->max_idx_node_sz = ALIGN(tmp, 8); | |
636 | ||
637 | /* Make sure LEB size is large enough to fit full commit */ | |
638 | tmp = UBIFS_CS_NODE_SZ + UBIFS_REF_NODE_SZ * c->jhead_cnt; | |
639 | tmp = ALIGN(tmp, c->min_io_size); | |
640 | if (tmp > c->leb_size) { | |
641 | dbg_err("too small LEB size %d, at least %d needed", | |
642 | c->leb_size, tmp); | |
643 | return -EINVAL; | |
644 | } | |
645 | ||
646 | /* | |
647 | * Make sure that the log is large enough to fit reference nodes for | |
648 | * all buds plus one reserved LEB. | |
649 | */ | |
4d61db4f AB |
650 | tmp64 = c->max_bud_bytes + c->leb_size - 1; |
651 | c->max_bud_cnt = div_u64(tmp64, c->leb_size); | |
1e51764a AB |
652 | tmp = (c->ref_node_alsz * c->max_bud_cnt + c->leb_size - 1); |
653 | tmp /= c->leb_size; | |
654 | tmp += 1; | |
655 | if (c->log_lebs < tmp) { | |
656 | dbg_err("too small log %d LEBs, required min. %d LEBs", | |
657 | c->log_lebs, tmp); | |
658 | return -EINVAL; | |
659 | } | |
660 | ||
661 | /* | |
662 | * When budgeting we assume worst-case scenarios when the pages are not | |
663 | * be compressed and direntries are of the maximum size. | |
664 | * | |
665 | * Note, data, which may be stored in inodes is budgeted separately, so | |
666 | * it is not included into 'c->inode_budget'. | |
667 | */ | |
668 | c->page_budget = UBIFS_MAX_DATA_NODE_SZ * UBIFS_BLOCKS_PER_PAGE; | |
669 | c->inode_budget = UBIFS_INO_NODE_SZ; | |
670 | c->dent_budget = UBIFS_MAX_DENT_NODE_SZ; | |
671 | ||
672 | /* | |
673 | * When the amount of flash space used by buds becomes | |
674 | * 'c->max_bud_bytes', UBIFS just blocks all writers and starts commit. | |
675 | * The writers are unblocked when the commit is finished. To avoid | |
676 | * writers to be blocked UBIFS initiates background commit in advance, | |
677 | * when number of bud bytes becomes above the limit defined below. | |
678 | */ | |
679 | c->bg_bud_bytes = (c->max_bud_bytes * 13) >> 4; | |
680 | ||
681 | /* | |
682 | * Ensure minimum journal size. All the bytes in the journal heads are | |
683 | * considered to be used, when calculating the current journal usage. | |
684 | * Consequently, if the journal is too small, UBIFS will treat it as | |
685 | * always full. | |
686 | */ | |
4d61db4f | 687 | tmp64 = (long long)(c->jhead_cnt + 1) * c->leb_size + 1; |
1e51764a AB |
688 | if (c->bg_bud_bytes < tmp64) |
689 | c->bg_bud_bytes = tmp64; | |
690 | if (c->max_bud_bytes < tmp64 + c->leb_size) | |
691 | c->max_bud_bytes = tmp64 + c->leb_size; | |
692 | ||
693 | err = ubifs_calc_lpt_geom(c); | |
694 | if (err) | |
695 | return err; | |
696 | ||
fb1cd01a AB |
697 | /* Initialize effective LEB size used in budgeting calculations */ |
698 | c->idx_leb_size = c->leb_size - c->max_idx_node_sz; | |
79807d07 AB |
699 | return 0; |
700 | } | |
701 | ||
702 | /* | |
703 | * init_constants_master - initialize UBIFS constants. | |
704 | * @c: UBIFS file-system description object | |
705 | * | |
706 | * This is a helper function which initializes various UBIFS constants after | |
707 | * the master node has been read. It also checks various UBIFS parameters and | |
708 | * makes sure they are all right. | |
709 | */ | |
710 | static void init_constants_master(struct ubifs_info *c) | |
711 | { | |
712 | long long tmp64; | |
713 | ||
1e51764a | 714 | c->min_idx_lebs = ubifs_calc_min_idx_lebs(c); |
fb1cd01a | 715 | c->report_rp_size = ubifs_reported_space(c, c->rp_size); |
1e51764a AB |
716 | |
717 | /* | |
718 | * Calculate total amount of FS blocks. This number is not used | |
719 | * internally because it does not make much sense for UBIFS, but it is | |
720 | * necessary to report something for the 'statfs()' call. | |
721 | * | |
7dad181b | 722 | * Subtract the LEB reserved for GC, the LEB which is reserved for |
af14a1ad AB |
723 | * deletions, minimum LEBs for the index, and assume only one journal |
724 | * head is available. | |
1e51764a | 725 | */ |
af14a1ad | 726 | tmp64 = c->main_lebs - 1 - 1 - MIN_INDEX_LEBS - c->jhead_cnt + 1; |
4d61db4f | 727 | tmp64 *= (long long)c->leb_size - c->leb_overhead; |
1e51764a AB |
728 | tmp64 = ubifs_reported_space(c, tmp64); |
729 | c->block_cnt = tmp64 >> UBIFS_BLOCK_SHIFT; | |
1e51764a AB |
730 | } |
731 | ||
732 | /** | |
733 | * take_gc_lnum - reserve GC LEB. | |
734 | * @c: UBIFS file-system description object | |
735 | * | |
b4978e94 AB |
736 | * This function ensures that the LEB reserved for garbage collection is marked |
737 | * as "taken" in lprops. We also have to set free space to LEB size and dirty | |
738 | * space to zero, because lprops may contain out-of-date information if the | |
739 | * file-system was un-mounted before it has been committed. This function | |
740 | * returns zero in case of success and a negative error code in case of | |
741 | * failure. | |
1e51764a AB |
742 | */ |
743 | static int take_gc_lnum(struct ubifs_info *c) | |
744 | { | |
745 | int err; | |
746 | ||
747 | if (c->gc_lnum == -1) { | |
748 | ubifs_err("no LEB for GC"); | |
749 | return -EINVAL; | |
750 | } | |
751 | ||
1e51764a AB |
752 | /* And we have to tell lprops that this LEB is taken */ |
753 | err = ubifs_change_one_lp(c, c->gc_lnum, c->leb_size, 0, | |
754 | LPROPS_TAKEN, 0, 0); | |
755 | return err; | |
756 | } | |
757 | ||
758 | /** | |
759 | * alloc_wbufs - allocate write-buffers. | |
760 | * @c: UBIFS file-system description object | |
761 | * | |
762 | * This helper function allocates and initializes UBIFS write-buffers. Returns | |
763 | * zero in case of success and %-ENOMEM in case of failure. | |
764 | */ | |
765 | static int alloc_wbufs(struct ubifs_info *c) | |
766 | { | |
767 | int i, err; | |
768 | ||
769 | c->jheads = kzalloc(c->jhead_cnt * sizeof(struct ubifs_jhead), | |
770 | GFP_KERNEL); | |
771 | if (!c->jheads) | |
772 | return -ENOMEM; | |
773 | ||
774 | /* Initialize journal heads */ | |
775 | for (i = 0; i < c->jhead_cnt; i++) { | |
776 | INIT_LIST_HEAD(&c->jheads[i].buds_list); | |
777 | err = ubifs_wbuf_init(c, &c->jheads[i].wbuf); | |
778 | if (err) | |
779 | return err; | |
780 | ||
781 | c->jheads[i].wbuf.sync_callback = &bud_wbuf_callback; | |
782 | c->jheads[i].wbuf.jhead = i; | |
783 | } | |
784 | ||
785 | c->jheads[BASEHD].wbuf.dtype = UBI_SHORTTERM; | |
786 | /* | |
787 | * Garbage Collector head likely contains long-term data and | |
788 | * does not need to be synchronized by timer. | |
789 | */ | |
790 | c->jheads[GCHD].wbuf.dtype = UBI_LONGTERM; | |
0b335b9d | 791 | c->jheads[GCHD].wbuf.no_timer = 1; |
1e51764a AB |
792 | |
793 | return 0; | |
794 | } | |
795 | ||
796 | /** | |
797 | * free_wbufs - free write-buffers. | |
798 | * @c: UBIFS file-system description object | |
799 | */ | |
800 | static void free_wbufs(struct ubifs_info *c) | |
801 | { | |
802 | int i; | |
803 | ||
804 | if (c->jheads) { | |
805 | for (i = 0; i < c->jhead_cnt; i++) { | |
806 | kfree(c->jheads[i].wbuf.buf); | |
807 | kfree(c->jheads[i].wbuf.inodes); | |
808 | } | |
809 | kfree(c->jheads); | |
810 | c->jheads = NULL; | |
811 | } | |
812 | } | |
813 | ||
814 | /** | |
815 | * free_orphans - free orphans. | |
816 | * @c: UBIFS file-system description object | |
817 | */ | |
818 | static void free_orphans(struct ubifs_info *c) | |
819 | { | |
820 | struct ubifs_orphan *orph; | |
821 | ||
822 | while (c->orph_dnext) { | |
823 | orph = c->orph_dnext; | |
824 | c->orph_dnext = orph->dnext; | |
825 | list_del(&orph->list); | |
826 | kfree(orph); | |
827 | } | |
828 | ||
829 | while (!list_empty(&c->orph_list)) { | |
830 | orph = list_entry(c->orph_list.next, struct ubifs_orphan, list); | |
831 | list_del(&orph->list); | |
832 | kfree(orph); | |
833 | dbg_err("orphan list not empty at unmount"); | |
834 | } | |
835 | ||
836 | vfree(c->orph_buf); | |
837 | c->orph_buf = NULL; | |
838 | } | |
839 | ||
840 | /** | |
841 | * free_buds - free per-bud objects. | |
842 | * @c: UBIFS file-system description object | |
843 | */ | |
844 | static void free_buds(struct ubifs_info *c) | |
845 | { | |
846 | struct rb_node *this = c->buds.rb_node; | |
847 | struct ubifs_bud *bud; | |
848 | ||
849 | while (this) { | |
850 | if (this->rb_left) | |
851 | this = this->rb_left; | |
852 | else if (this->rb_right) | |
853 | this = this->rb_right; | |
854 | else { | |
855 | bud = rb_entry(this, struct ubifs_bud, rb); | |
856 | this = rb_parent(this); | |
857 | if (this) { | |
858 | if (this->rb_left == &bud->rb) | |
859 | this->rb_left = NULL; | |
860 | else | |
861 | this->rb_right = NULL; | |
862 | } | |
863 | kfree(bud); | |
864 | } | |
865 | } | |
866 | } | |
867 | ||
868 | /** | |
869 | * check_volume_empty - check if the UBI volume is empty. | |
870 | * @c: UBIFS file-system description object | |
871 | * | |
872 | * This function checks if the UBIFS volume is empty by looking if its LEBs are | |
873 | * mapped or not. The result of checking is stored in the @c->empty variable. | |
874 | * Returns zero in case of success and a negative error code in case of | |
875 | * failure. | |
876 | */ | |
877 | static int check_volume_empty(struct ubifs_info *c) | |
878 | { | |
879 | int lnum, err; | |
880 | ||
881 | c->empty = 1; | |
882 | for (lnum = 0; lnum < c->leb_cnt; lnum++) { | |
883 | err = ubi_is_mapped(c->ubi, lnum); | |
884 | if (unlikely(err < 0)) | |
885 | return err; | |
886 | if (err == 1) { | |
887 | c->empty = 0; | |
888 | break; | |
889 | } | |
890 | ||
891 | cond_resched(); | |
892 | } | |
893 | ||
894 | return 0; | |
895 | } | |
896 | ||
897 | /* | |
898 | * UBIFS mount options. | |
899 | * | |
900 | * Opt_fast_unmount: do not run a journal commit before un-mounting | |
901 | * Opt_norm_unmount: run a journal commit before un-mounting | |
4793e7c5 AH |
902 | * Opt_bulk_read: enable bulk-reads |
903 | * Opt_no_bulk_read: disable bulk-reads | |
2953e73f AH |
904 | * Opt_chk_data_crc: check CRCs when reading data nodes |
905 | * Opt_no_chk_data_crc: do not check CRCs when reading data nodes | |
553dea4d | 906 | * Opt_override_compr: override default compressor |
1e51764a AB |
907 | * Opt_err: just end of array marker |
908 | */ | |
909 | enum { | |
910 | Opt_fast_unmount, | |
911 | Opt_norm_unmount, | |
4793e7c5 AH |
912 | Opt_bulk_read, |
913 | Opt_no_bulk_read, | |
2953e73f AH |
914 | Opt_chk_data_crc, |
915 | Opt_no_chk_data_crc, | |
553dea4d | 916 | Opt_override_compr, |
1e51764a AB |
917 | Opt_err, |
918 | }; | |
919 | ||
a447c093 | 920 | static const match_table_t tokens = { |
1e51764a AB |
921 | {Opt_fast_unmount, "fast_unmount"}, |
922 | {Opt_norm_unmount, "norm_unmount"}, | |
4793e7c5 AH |
923 | {Opt_bulk_read, "bulk_read"}, |
924 | {Opt_no_bulk_read, "no_bulk_read"}, | |
2953e73f AH |
925 | {Opt_chk_data_crc, "chk_data_crc"}, |
926 | {Opt_no_chk_data_crc, "no_chk_data_crc"}, | |
553dea4d | 927 | {Opt_override_compr, "compr=%s"}, |
1e51764a AB |
928 | {Opt_err, NULL}, |
929 | }; | |
930 | ||
8379ea31 AB |
931 | /** |
932 | * parse_standard_option - parse a standard mount option. | |
933 | * @option: the option to parse | |
934 | * | |
935 | * Normally, standard mount options like "sync" are passed to file-systems as | |
936 | * flags. However, when a "rootflags=" kernel boot parameter is used, they may | |
937 | * be present in the options string. This function tries to deal with this | |
938 | * situation and parse standard options. Returns 0 if the option was not | |
939 | * recognized, and the corresponding integer flag if it was. | |
940 | * | |
941 | * UBIFS is only interested in the "sync" option, so do not check for anything | |
942 | * else. | |
943 | */ | |
944 | static int parse_standard_option(const char *option) | |
945 | { | |
946 | ubifs_msg("parse %s", option); | |
947 | if (!strcmp(option, "sync")) | |
948 | return MS_SYNCHRONOUS; | |
949 | return 0; | |
950 | } | |
951 | ||
1e51764a AB |
952 | /** |
953 | * ubifs_parse_options - parse mount parameters. | |
954 | * @c: UBIFS file-system description object | |
955 | * @options: parameters to parse | |
956 | * @is_remount: non-zero if this is FS re-mount | |
957 | * | |
958 | * This function parses UBIFS mount options and returns zero in case success | |
959 | * and a negative error code in case of failure. | |
960 | */ | |
961 | static int ubifs_parse_options(struct ubifs_info *c, char *options, | |
962 | int is_remount) | |
963 | { | |
964 | char *p; | |
965 | substring_t args[MAX_OPT_ARGS]; | |
966 | ||
967 | if (!options) | |
968 | return 0; | |
969 | ||
970 | while ((p = strsep(&options, ","))) { | |
971 | int token; | |
972 | ||
973 | if (!*p) | |
974 | continue; | |
975 | ||
976 | token = match_token(p, tokens, args); | |
977 | switch (token) { | |
27ad2799 AB |
978 | /* |
979 | * %Opt_fast_unmount and %Opt_norm_unmount options are ignored. | |
cb54ef8b | 980 | * We accept them in order to be backward-compatible. But this |
27ad2799 AB |
981 | * should be removed at some point. |
982 | */ | |
1e51764a AB |
983 | case Opt_fast_unmount: |
984 | c->mount_opts.unmount_mode = 2; | |
1e51764a AB |
985 | break; |
986 | case Opt_norm_unmount: | |
987 | c->mount_opts.unmount_mode = 1; | |
1e51764a | 988 | break; |
4793e7c5 AH |
989 | case Opt_bulk_read: |
990 | c->mount_opts.bulk_read = 2; | |
991 | c->bulk_read = 1; | |
992 | break; | |
993 | case Opt_no_bulk_read: | |
994 | c->mount_opts.bulk_read = 1; | |
995 | c->bulk_read = 0; | |
996 | break; | |
2953e73f AH |
997 | case Opt_chk_data_crc: |
998 | c->mount_opts.chk_data_crc = 2; | |
999 | c->no_chk_data_crc = 0; | |
1000 | break; | |
1001 | case Opt_no_chk_data_crc: | |
1002 | c->mount_opts.chk_data_crc = 1; | |
1003 | c->no_chk_data_crc = 1; | |
1004 | break; | |
553dea4d AB |
1005 | case Opt_override_compr: |
1006 | { | |
1007 | char *name = match_strdup(&args[0]); | |
1008 | ||
1009 | if (!name) | |
1010 | return -ENOMEM; | |
1011 | if (!strcmp(name, "none")) | |
1012 | c->mount_opts.compr_type = UBIFS_COMPR_NONE; | |
1013 | else if (!strcmp(name, "lzo")) | |
1014 | c->mount_opts.compr_type = UBIFS_COMPR_LZO; | |
1015 | else if (!strcmp(name, "zlib")) | |
1016 | c->mount_opts.compr_type = UBIFS_COMPR_ZLIB; | |
1017 | else { | |
1018 | ubifs_err("unknown compressor \"%s\"", name); | |
1019 | kfree(name); | |
1020 | return -EINVAL; | |
1021 | } | |
1022 | kfree(name); | |
1023 | c->mount_opts.override_compr = 1; | |
1024 | c->default_compr = c->mount_opts.compr_type; | |
1025 | break; | |
1026 | } | |
1e51764a | 1027 | default: |
8379ea31 AB |
1028 | { |
1029 | unsigned long flag; | |
1030 | struct super_block *sb = c->vfs_sb; | |
1031 | ||
1032 | flag = parse_standard_option(p); | |
1033 | if (!flag) { | |
1034 | ubifs_err("unrecognized mount option \"%s\" " | |
1035 | "or missing value", p); | |
1036 | return -EINVAL; | |
1037 | } | |
1038 | sb->s_flags |= flag; | |
1039 | break; | |
1040 | } | |
1e51764a AB |
1041 | } |
1042 | } | |
1043 | ||
1044 | return 0; | |
1045 | } | |
1046 | ||
1047 | /** | |
1048 | * destroy_journal - destroy journal data structures. | |
1049 | * @c: UBIFS file-system description object | |
1050 | * | |
1051 | * This function destroys journal data structures including those that may have | |
1052 | * been created by recovery functions. | |
1053 | */ | |
1054 | static void destroy_journal(struct ubifs_info *c) | |
1055 | { | |
1056 | while (!list_empty(&c->unclean_leb_list)) { | |
1057 | struct ubifs_unclean_leb *ucleb; | |
1058 | ||
1059 | ucleb = list_entry(c->unclean_leb_list.next, | |
1060 | struct ubifs_unclean_leb, list); | |
1061 | list_del(&ucleb->list); | |
1062 | kfree(ucleb); | |
1063 | } | |
1064 | while (!list_empty(&c->old_buds)) { | |
1065 | struct ubifs_bud *bud; | |
1066 | ||
1067 | bud = list_entry(c->old_buds.next, struct ubifs_bud, list); | |
1068 | list_del(&bud->list); | |
1069 | kfree(bud); | |
1070 | } | |
1071 | ubifs_destroy_idx_gc(c); | |
1072 | ubifs_destroy_size_tree(c); | |
1073 | ubifs_tnc_close(c); | |
1074 | free_buds(c); | |
1075 | } | |
1076 | ||
3477d204 AB |
1077 | /** |
1078 | * bu_init - initialize bulk-read information. | |
1079 | * @c: UBIFS file-system description object | |
1080 | */ | |
1081 | static void bu_init(struct ubifs_info *c) | |
1082 | { | |
1083 | ubifs_assert(c->bulk_read == 1); | |
1084 | ||
1085 | if (c->bu.buf) | |
1086 | return; /* Already initialized */ | |
1087 | ||
1088 | again: | |
1089 | c->bu.buf = kmalloc(c->max_bu_buf_len, GFP_KERNEL | __GFP_NOWARN); | |
1090 | if (!c->bu.buf) { | |
1091 | if (c->max_bu_buf_len > UBIFS_KMALLOC_OK) { | |
1092 | c->max_bu_buf_len = UBIFS_KMALLOC_OK; | |
1093 | goto again; | |
1094 | } | |
1095 | ||
1096 | /* Just disable bulk-read */ | |
1097 | ubifs_warn("Cannot allocate %d bytes of memory for bulk-read, " | |
1098 | "disabling it", c->max_bu_buf_len); | |
1099 | c->mount_opts.bulk_read = 1; | |
1100 | c->bulk_read = 0; | |
1101 | return; | |
1102 | } | |
1103 | } | |
1104 | ||
57a450e9 AB |
1105 | /** |
1106 | * check_free_space - check if there is enough free space to mount. | |
1107 | * @c: UBIFS file-system description object | |
1108 | * | |
1109 | * This function makes sure UBIFS has enough free space to be mounted in | |
1110 | * read/write mode. UBIFS must always have some free space to allow deletions. | |
1111 | */ | |
1112 | static int check_free_space(struct ubifs_info *c) | |
1113 | { | |
1114 | ubifs_assert(c->dark_wm > 0); | |
1115 | if (c->lst.total_free + c->lst.total_dirty < c->dark_wm) { | |
1116 | ubifs_err("insufficient free space to mount in read/write mode"); | |
1117 | dbg_dump_budg(c); | |
1118 | dbg_dump_lprops(c); | |
a2b9df3f | 1119 | return -ENOSPC; |
57a450e9 AB |
1120 | } |
1121 | return 0; | |
1122 | } | |
1123 | ||
1e51764a AB |
1124 | /** |
1125 | * mount_ubifs - mount UBIFS file-system. | |
1126 | * @c: UBIFS file-system description object | |
1127 | * | |
1128 | * This function mounts UBIFS file system. Returns zero in case of success and | |
1129 | * a negative error code in case of failure. | |
1130 | * | |
1131 | * Note, the function does not de-allocate resources it it fails half way | |
1132 | * through, and the caller has to do this instead. | |
1133 | */ | |
1134 | static int mount_ubifs(struct ubifs_info *c) | |
1135 | { | |
1136 | struct super_block *sb = c->vfs_sb; | |
1137 | int err, mounted_read_only = (sb->s_flags & MS_RDONLY); | |
1138 | long long x; | |
1139 | size_t sz; | |
1140 | ||
1141 | err = init_constants_early(c); | |
1142 | if (err) | |
1143 | return err; | |
1144 | ||
17c2f9f8 AB |
1145 | err = ubifs_debugging_init(c); |
1146 | if (err) | |
1147 | return err; | |
1e51764a AB |
1148 | |
1149 | err = check_volume_empty(c); | |
1150 | if (err) | |
1151 | goto out_free; | |
1152 | ||
1153 | if (c->empty && (mounted_read_only || c->ro_media)) { | |
1154 | /* | |
1155 | * This UBI volume is empty, and read-only, or the file system | |
1156 | * is mounted read-only - we cannot format it. | |
1157 | */ | |
1158 | ubifs_err("can't format empty UBI volume: read-only %s", | |
1159 | c->ro_media ? "UBI volume" : "mount"); | |
1160 | err = -EROFS; | |
1161 | goto out_free; | |
1162 | } | |
1163 | ||
1164 | if (c->ro_media && !mounted_read_only) { | |
1165 | ubifs_err("cannot mount read-write - read-only media"); | |
1166 | err = -EROFS; | |
1167 | goto out_free; | |
1168 | } | |
1169 | ||
1170 | /* | |
1171 | * The requirement for the buffer is that it should fit indexing B-tree | |
1172 | * height amount of integers. We assume the height if the TNC tree will | |
1173 | * never exceed 64. | |
1174 | */ | |
1175 | err = -ENOMEM; | |
1176 | c->bottom_up_buf = kmalloc(BOTTOM_UP_HEIGHT * sizeof(int), GFP_KERNEL); | |
1177 | if (!c->bottom_up_buf) | |
1178 | goto out_free; | |
1179 | ||
1180 | c->sbuf = vmalloc(c->leb_size); | |
1181 | if (!c->sbuf) | |
1182 | goto out_free; | |
1183 | ||
1184 | if (!mounted_read_only) { | |
1185 | c->ileb_buf = vmalloc(c->leb_size); | |
1186 | if (!c->ileb_buf) | |
1187 | goto out_free; | |
1188 | } | |
1189 | ||
3477d204 AB |
1190 | if (c->bulk_read == 1) |
1191 | bu_init(c); | |
1192 | ||
1193 | /* | |
1194 | * We have to check all CRCs, even for data nodes, when we mount the FS | |
1195 | * (specifically, when we are replaying). | |
1196 | */ | |
2953e73f AH |
1197 | c->always_chk_crc = 1; |
1198 | ||
1e51764a AB |
1199 | err = ubifs_read_superblock(c); |
1200 | if (err) | |
1201 | goto out_free; | |
1202 | ||
1203 | /* | |
553dea4d | 1204 | * Make sure the compressor which is set as default in the superblock |
57a450e9 | 1205 | * or overridden by mount options is actually compiled in. |
1e51764a AB |
1206 | */ |
1207 | if (!ubifs_compr_present(c->default_compr)) { | |
553dea4d AB |
1208 | ubifs_err("'compressor \"%s\" is not compiled in", |
1209 | ubifs_compr_name(c->default_compr)); | |
8eec2f36 | 1210 | err = -ENOTSUPP; |
553dea4d | 1211 | goto out_free; |
1e51764a AB |
1212 | } |
1213 | ||
79807d07 | 1214 | err = init_constants_sb(c); |
1e51764a | 1215 | if (err) |
17c2f9f8 | 1216 | goto out_free; |
1e51764a AB |
1217 | |
1218 | sz = ALIGN(c->max_idx_node_sz, c->min_io_size); | |
1219 | sz = ALIGN(sz + c->max_idx_node_sz, c->min_io_size); | |
1220 | c->cbuf = kmalloc(sz, GFP_NOFS); | |
1221 | if (!c->cbuf) { | |
1222 | err = -ENOMEM; | |
17c2f9f8 | 1223 | goto out_free; |
1e51764a AB |
1224 | } |
1225 | ||
0855f310 | 1226 | sprintf(c->bgt_name, BGT_NAME_PATTERN, c->vi.ubi_num, c->vi.vol_id); |
1e51764a AB |
1227 | if (!mounted_read_only) { |
1228 | err = alloc_wbufs(c); | |
1229 | if (err) | |
1230 | goto out_cbuf; | |
1231 | ||
1232 | /* Create background thread */ | |
fcabb347 | 1233 | c->bgt = kthread_create(ubifs_bg_thread, c, "%s", c->bgt_name); |
1e51764a AB |
1234 | if (IS_ERR(c->bgt)) { |
1235 | err = PTR_ERR(c->bgt); | |
1236 | c->bgt = NULL; | |
1237 | ubifs_err("cannot spawn \"%s\", error %d", | |
1238 | c->bgt_name, err); | |
1239 | goto out_wbufs; | |
1240 | } | |
1241 | wake_up_process(c->bgt); | |
1242 | } | |
1243 | ||
1244 | err = ubifs_read_master(c); | |
1245 | if (err) | |
1246 | goto out_master; | |
1247 | ||
79807d07 AB |
1248 | init_constants_master(c); |
1249 | ||
1e51764a AB |
1250 | if ((c->mst_node->flags & cpu_to_le32(UBIFS_MST_DIRTY)) != 0) { |
1251 | ubifs_msg("recovery needed"); | |
1252 | c->need_recovery = 1; | |
1253 | if (!mounted_read_only) { | |
1254 | err = ubifs_recover_inl_heads(c, c->sbuf); | |
1255 | if (err) | |
1256 | goto out_master; | |
1257 | } | |
1258 | } else if (!mounted_read_only) { | |
1259 | /* | |
1260 | * Set the "dirty" flag so that if we reboot uncleanly we | |
1261 | * will notice this immediately on the next mount. | |
1262 | */ | |
1263 | c->mst_node->flags |= cpu_to_le32(UBIFS_MST_DIRTY); | |
1264 | err = ubifs_write_master(c); | |
1265 | if (err) | |
1266 | goto out_master; | |
1267 | } | |
1268 | ||
1269 | err = ubifs_lpt_init(c, 1, !mounted_read_only); | |
1270 | if (err) | |
1271 | goto out_lpt; | |
1272 | ||
1273 | err = dbg_check_idx_size(c, c->old_idx_sz); | |
1274 | if (err) | |
1275 | goto out_lpt; | |
1276 | ||
1277 | err = ubifs_replay_journal(c); | |
1278 | if (err) | |
1279 | goto out_journal; | |
1280 | ||
1fb8bd01 AB |
1281 | /* Calculate 'min_idx_lebs' after journal replay */ |
1282 | c->min_idx_lebs = ubifs_calc_min_idx_lebs(c); | |
1283 | ||
1e51764a AB |
1284 | err = ubifs_mount_orphans(c, c->need_recovery, mounted_read_only); |
1285 | if (err) | |
1286 | goto out_orphans; | |
1287 | ||
1288 | if (!mounted_read_only) { | |
1289 | int lnum; | |
1290 | ||
57a450e9 AB |
1291 | err = check_free_space(c); |
1292 | if (err) | |
1e51764a | 1293 | goto out_orphans; |
1e51764a AB |
1294 | |
1295 | /* Check for enough log space */ | |
1296 | lnum = c->lhead_lnum + 1; | |
1297 | if (lnum >= UBIFS_LOG_LNUM + c->log_lebs) | |
1298 | lnum = UBIFS_LOG_LNUM; | |
1299 | if (lnum == c->ltail_lnum) { | |
1300 | err = ubifs_consolidate_log(c); | |
1301 | if (err) | |
1302 | goto out_orphans; | |
1303 | } | |
1304 | ||
1305 | if (c->need_recovery) { | |
1306 | err = ubifs_recover_size(c); | |
1307 | if (err) | |
1308 | goto out_orphans; | |
1309 | err = ubifs_rcvry_gc_commit(c); | |
b4978e94 | 1310 | } else { |
1e51764a | 1311 | err = take_gc_lnum(c); |
b4978e94 AB |
1312 | if (err) |
1313 | goto out_orphans; | |
1314 | ||
1315 | /* | |
1316 | * GC LEB may contain garbage if there was an unclean | |
1317 | * reboot, and it should be un-mapped. | |
1318 | */ | |
1319 | err = ubifs_leb_unmap(c, c->gc_lnum); | |
1320 | if (err) | |
1321 | return err; | |
1322 | } | |
1e51764a AB |
1323 | |
1324 | err = dbg_check_lprops(c); | |
1325 | if (err) | |
1326 | goto out_orphans; | |
1327 | } else if (c->need_recovery) { | |
1328 | err = ubifs_recover_size(c); | |
1329 | if (err) | |
1330 | goto out_orphans; | |
b4978e94 AB |
1331 | } else { |
1332 | /* | |
1333 | * Even if we mount read-only, we have to set space in GC LEB | |
1334 | * to proper value because this affects UBIFS free space | |
1335 | * reporting. We do not want to have a situation when | |
1336 | * re-mounting from R/O to R/W changes amount of free space. | |
1337 | */ | |
1338 | err = take_gc_lnum(c); | |
1339 | if (err) | |
1340 | goto out_orphans; | |
1e51764a AB |
1341 | } |
1342 | ||
1343 | spin_lock(&ubifs_infos_lock); | |
1344 | list_add_tail(&c->infos_list, &ubifs_infos); | |
1345 | spin_unlock(&ubifs_infos_lock); | |
1346 | ||
1347 | if (c->need_recovery) { | |
1348 | if (mounted_read_only) | |
1349 | ubifs_msg("recovery deferred"); | |
1350 | else { | |
1351 | c->need_recovery = 0; | |
1352 | ubifs_msg("recovery completed"); | |
b221337a AB |
1353 | /* |
1354 | * GC LEB has to be empty and taken at this point. But | |
1355 | * the journal head LEBs may also be accounted as | |
1356 | * "empty taken" if they are empty. | |
1357 | */ | |
1358 | ubifs_assert(c->lst.taken_empty_lebs > 0); | |
1e51764a | 1359 | } |
6ba87c9b | 1360 | } else |
b221337a | 1361 | ubifs_assert(c->lst.taken_empty_lebs > 0); |
1e51764a | 1362 | |
6ba87c9b | 1363 | err = dbg_check_filesystem(c); |
552ff317 AB |
1364 | if (err) |
1365 | goto out_infos; | |
1366 | ||
6ba87c9b | 1367 | err = dbg_debugfs_init_fs(c); |
1e51764a AB |
1368 | if (err) |
1369 | goto out_infos; | |
1370 | ||
2953e73f AH |
1371 | c->always_chk_crc = 0; |
1372 | ||
ce769caa AB |
1373 | ubifs_msg("mounted UBI device %d, volume %d, name \"%s\"", |
1374 | c->vi.ubi_num, c->vi.vol_id, c->vi.name); | |
1e51764a AB |
1375 | if (mounted_read_only) |
1376 | ubifs_msg("mounted read-only"); | |
1377 | x = (long long)c->main_lebs * c->leb_size; | |
948cfb21 AB |
1378 | ubifs_msg("file system size: %lld bytes (%lld KiB, %lld MiB, %d " |
1379 | "LEBs)", x, x >> 10, x >> 20, c->main_lebs); | |
1e51764a | 1380 | x = (long long)c->log_lebs * c->leb_size + c->max_bud_bytes; |
948cfb21 AB |
1381 | ubifs_msg("journal size: %lld bytes (%lld KiB, %lld MiB, %d " |
1382 | "LEBs)", x, x >> 10, x >> 20, c->log_lebs + c->max_bud_cnt); | |
963f0cf6 AB |
1383 | ubifs_msg("media format: w%d/r%d (latest is w%d/r%d)", |
1384 | c->fmt_version, c->ro_compat_version, | |
1385 | UBIFS_FORMAT_VERSION, UBIFS_RO_COMPAT_VERSION); | |
948cfb21 | 1386 | ubifs_msg("default compressor: %s", ubifs_compr_name(c->default_compr)); |
fae7fb29 | 1387 | ubifs_msg("reserved for root: %llu bytes (%llu KiB)", |
948cfb21 | 1388 | c->report_rp_size, c->report_rp_size >> 10); |
1e51764a AB |
1389 | |
1390 | dbg_msg("compiled on: " __DATE__ " at " __TIME__); | |
1391 | dbg_msg("min. I/O unit size: %d bytes", c->min_io_size); | |
1392 | dbg_msg("LEB size: %d bytes (%d KiB)", | |
948cfb21 | 1393 | c->leb_size, c->leb_size >> 10); |
1e51764a AB |
1394 | dbg_msg("data journal heads: %d", |
1395 | c->jhead_cnt - NONDATA_JHEADS_CNT); | |
7f2f4e72 | 1396 | dbg_msg("UUID: %pUB", c->uuid); |
1e51764a AB |
1397 | dbg_msg("big_lpt %d", c->big_lpt); |
1398 | dbg_msg("log LEBs: %d (%d - %d)", | |
1399 | c->log_lebs, UBIFS_LOG_LNUM, c->log_last); | |
1400 | dbg_msg("LPT area LEBs: %d (%d - %d)", | |
1401 | c->lpt_lebs, c->lpt_first, c->lpt_last); | |
1402 | dbg_msg("orphan area LEBs: %d (%d - %d)", | |
1403 | c->orph_lebs, c->orph_first, c->orph_last); | |
1404 | dbg_msg("main area LEBs: %d (%d - %d)", | |
1405 | c->main_lebs, c->main_first, c->leb_cnt - 1); | |
1406 | dbg_msg("index LEBs: %d", c->lst.idx_lebs); | |
1407 | dbg_msg("total index bytes: %lld (%lld KiB, %lld MiB)", | |
1408 | c->old_idx_sz, c->old_idx_sz >> 10, c->old_idx_sz >> 20); | |
1409 | dbg_msg("key hash type: %d", c->key_hash_type); | |
1410 | dbg_msg("tree fanout: %d", c->fanout); | |
1411 | dbg_msg("reserved GC LEB: %d", c->gc_lnum); | |
1412 | dbg_msg("first main LEB: %d", c->main_first); | |
8e5033ad AB |
1413 | dbg_msg("max. znode size %d", c->max_znode_sz); |
1414 | dbg_msg("max. index node size %d", c->max_idx_node_sz); | |
1415 | dbg_msg("node sizes: data %zu, inode %zu, dentry %zu", | |
1416 | UBIFS_DATA_NODE_SZ, UBIFS_INO_NODE_SZ, UBIFS_DENT_NODE_SZ); | |
1417 | dbg_msg("node sizes: trun %zu, sb %zu, master %zu", | |
1418 | UBIFS_TRUN_NODE_SZ, UBIFS_SB_NODE_SZ, UBIFS_MST_NODE_SZ); | |
1419 | dbg_msg("node sizes: ref %zu, cmt. start %zu, orph %zu", | |
1420 | UBIFS_REF_NODE_SZ, UBIFS_CS_NODE_SZ, UBIFS_ORPH_NODE_SZ); | |
1421 | dbg_msg("max. node sizes: data %zu, inode %zu dentry %zu", | |
1422 | UBIFS_MAX_DATA_NODE_SZ, UBIFS_MAX_INO_NODE_SZ, | |
1423 | UBIFS_MAX_DENT_NODE_SZ); | |
1e51764a AB |
1424 | dbg_msg("dead watermark: %d", c->dead_wm); |
1425 | dbg_msg("dark watermark: %d", c->dark_wm); | |
8e5033ad | 1426 | dbg_msg("LEB overhead: %d", c->leb_overhead); |
1e51764a AB |
1427 | x = (long long)c->main_lebs * c->dark_wm; |
1428 | dbg_msg("max. dark space: %lld (%lld KiB, %lld MiB)", | |
1429 | x, x >> 10, x >> 20); | |
1430 | dbg_msg("maximum bud bytes: %lld (%lld KiB, %lld MiB)", | |
1431 | c->max_bud_bytes, c->max_bud_bytes >> 10, | |
1432 | c->max_bud_bytes >> 20); | |
1433 | dbg_msg("BG commit bud bytes: %lld (%lld KiB, %lld MiB)", | |
1434 | c->bg_bud_bytes, c->bg_bud_bytes >> 10, | |
1435 | c->bg_bud_bytes >> 20); | |
1436 | dbg_msg("current bud bytes %lld (%lld KiB, %lld MiB)", | |
1437 | c->bud_bytes, c->bud_bytes >> 10, c->bud_bytes >> 20); | |
1438 | dbg_msg("max. seq. number: %llu", c->max_sqnum); | |
1439 | dbg_msg("commit number: %llu", c->cmt_no); | |
1440 | ||
1441 | return 0; | |
1442 | ||
1443 | out_infos: | |
1444 | spin_lock(&ubifs_infos_lock); | |
1445 | list_del(&c->infos_list); | |
1446 | spin_unlock(&ubifs_infos_lock); | |
1447 | out_orphans: | |
1448 | free_orphans(c); | |
1449 | out_journal: | |
1450 | destroy_journal(c); | |
1451 | out_lpt: | |
1452 | ubifs_lpt_free(c, 0); | |
1453 | out_master: | |
1454 | kfree(c->mst_node); | |
1455 | kfree(c->rcvrd_mst_node); | |
1456 | if (c->bgt) | |
1457 | kthread_stop(c->bgt); | |
1458 | out_wbufs: | |
1459 | free_wbufs(c); | |
1460 | out_cbuf: | |
1461 | kfree(c->cbuf); | |
1e51764a | 1462 | out_free: |
3477d204 | 1463 | kfree(c->bu.buf); |
1e51764a AB |
1464 | vfree(c->ileb_buf); |
1465 | vfree(c->sbuf); | |
1466 | kfree(c->bottom_up_buf); | |
17c2f9f8 | 1467 | ubifs_debugging_exit(c); |
1e51764a AB |
1468 | return err; |
1469 | } | |
1470 | ||
1471 | /** | |
1472 | * ubifs_umount - un-mount UBIFS file-system. | |
1473 | * @c: UBIFS file-system description object | |
1474 | * | |
1475 | * Note, this function is called to free allocated resourced when un-mounting, | |
1476 | * as well as free resources when an error occurred while we were half way | |
1477 | * through mounting (error path cleanup function). So it has to make sure the | |
1478 | * resource was actually allocated before freeing it. | |
1479 | */ | |
1480 | static void ubifs_umount(struct ubifs_info *c) | |
1481 | { | |
1482 | dbg_gen("un-mounting UBI device %d, volume %d", c->vi.ubi_num, | |
1483 | c->vi.vol_id); | |
1484 | ||
552ff317 | 1485 | dbg_debugfs_exit_fs(c); |
1e51764a AB |
1486 | spin_lock(&ubifs_infos_lock); |
1487 | list_del(&c->infos_list); | |
1488 | spin_unlock(&ubifs_infos_lock); | |
1489 | ||
1490 | if (c->bgt) | |
1491 | kthread_stop(c->bgt); | |
1492 | ||
1493 | destroy_journal(c); | |
1494 | free_wbufs(c); | |
1495 | free_orphans(c); | |
1496 | ubifs_lpt_free(c, 0); | |
1497 | ||
1498 | kfree(c->cbuf); | |
1499 | kfree(c->rcvrd_mst_node); | |
1500 | kfree(c->mst_node); | |
3477d204 AB |
1501 | kfree(c->bu.buf); |
1502 | vfree(c->ileb_buf); | |
1e51764a AB |
1503 | vfree(c->sbuf); |
1504 | kfree(c->bottom_up_buf); | |
17c2f9f8 | 1505 | ubifs_debugging_exit(c); |
1e51764a AB |
1506 | } |
1507 | ||
1508 | /** | |
1509 | * ubifs_remount_rw - re-mount in read-write mode. | |
1510 | * @c: UBIFS file-system description object | |
1511 | * | |
1512 | * UBIFS avoids allocating many unnecessary resources when mounted in read-only | |
1513 | * mode. This function allocates the needed resources and re-mounts UBIFS in | |
1514 | * read-write mode. | |
1515 | */ | |
1516 | static int ubifs_remount_rw(struct ubifs_info *c) | |
1517 | { | |
1518 | int err, lnum; | |
1519 | ||
963f0cf6 AB |
1520 | if (c->rw_incompat) { |
1521 | ubifs_err("the file-system is not R/W-compatible"); | |
1522 | ubifs_msg("on-flash format version is w%d/r%d, but software " | |
1523 | "only supports up to version w%d/r%d", c->fmt_version, | |
1524 | c->ro_compat_version, UBIFS_FORMAT_VERSION, | |
1525 | UBIFS_RO_COMPAT_VERSION); | |
1526 | return -EROFS; | |
1527 | } | |
1528 | ||
1e51764a | 1529 | mutex_lock(&c->umount_mutex); |
84abf972 | 1530 | dbg_save_space_info(c); |
1e51764a | 1531 | c->remounting_rw = 1; |
2953e73f | 1532 | c->always_chk_crc = 1; |
1e51764a | 1533 | |
57a450e9 AB |
1534 | err = check_free_space(c); |
1535 | if (err) | |
1e51764a | 1536 | goto out; |
1e51764a AB |
1537 | |
1538 | if (c->old_leb_cnt != c->leb_cnt) { | |
1539 | struct ubifs_sb_node *sup; | |
1540 | ||
1541 | sup = ubifs_read_sb_node(c); | |
1542 | if (IS_ERR(sup)) { | |
1543 | err = PTR_ERR(sup); | |
1544 | goto out; | |
1545 | } | |
1546 | sup->leb_cnt = cpu_to_le32(c->leb_cnt); | |
1547 | err = ubifs_write_sb_node(c, sup); | |
1548 | if (err) | |
1549 | goto out; | |
1550 | } | |
1551 | ||
1552 | if (c->need_recovery) { | |
1553 | ubifs_msg("completing deferred recovery"); | |
1554 | err = ubifs_write_rcvrd_mst_node(c); | |
1555 | if (err) | |
1556 | goto out; | |
1557 | err = ubifs_recover_size(c); | |
1558 | if (err) | |
1559 | goto out; | |
1560 | err = ubifs_clean_lebs(c, c->sbuf); | |
1561 | if (err) | |
1562 | goto out; | |
1563 | err = ubifs_recover_inl_heads(c, c->sbuf); | |
1564 | if (err) | |
1565 | goto out; | |
49d128aa AH |
1566 | } else { |
1567 | /* A readonly mount is not allowed to have orphans */ | |
1568 | ubifs_assert(c->tot_orphans == 0); | |
1569 | err = ubifs_clear_orphans(c); | |
1570 | if (err) | |
1571 | goto out; | |
1e51764a AB |
1572 | } |
1573 | ||
1574 | if (!(c->mst_node->flags & cpu_to_le32(UBIFS_MST_DIRTY))) { | |
1575 | c->mst_node->flags |= cpu_to_le32(UBIFS_MST_DIRTY); | |
1576 | err = ubifs_write_master(c); | |
1577 | if (err) | |
1578 | goto out; | |
1579 | } | |
1580 | ||
1581 | c->ileb_buf = vmalloc(c->leb_size); | |
1582 | if (!c->ileb_buf) { | |
1583 | err = -ENOMEM; | |
1584 | goto out; | |
1585 | } | |
1586 | ||
1587 | err = ubifs_lpt_init(c, 0, 1); | |
1588 | if (err) | |
1589 | goto out; | |
1590 | ||
1591 | err = alloc_wbufs(c); | |
1592 | if (err) | |
1593 | goto out; | |
1594 | ||
1595 | ubifs_create_buds_lists(c); | |
1596 | ||
1597 | /* Create background thread */ | |
fcabb347 | 1598 | c->bgt = kthread_create(ubifs_bg_thread, c, "%s", c->bgt_name); |
1e51764a AB |
1599 | if (IS_ERR(c->bgt)) { |
1600 | err = PTR_ERR(c->bgt); | |
1601 | c->bgt = NULL; | |
1602 | ubifs_err("cannot spawn \"%s\", error %d", | |
1603 | c->bgt_name, err); | |
2953e73f | 1604 | goto out; |
1e51764a AB |
1605 | } |
1606 | wake_up_process(c->bgt); | |
1607 | ||
1608 | c->orph_buf = vmalloc(c->leb_size); | |
2953e73f AH |
1609 | if (!c->orph_buf) { |
1610 | err = -ENOMEM; | |
1611 | goto out; | |
1612 | } | |
1e51764a AB |
1613 | |
1614 | /* Check for enough log space */ | |
1615 | lnum = c->lhead_lnum + 1; | |
1616 | if (lnum >= UBIFS_LOG_LNUM + c->log_lebs) | |
1617 | lnum = UBIFS_LOG_LNUM; | |
1618 | if (lnum == c->ltail_lnum) { | |
1619 | err = ubifs_consolidate_log(c); | |
1620 | if (err) | |
1621 | goto out; | |
1622 | } | |
1623 | ||
1624 | if (c->need_recovery) | |
1625 | err = ubifs_rcvry_gc_commit(c); | |
1626 | else | |
b4978e94 | 1627 | err = ubifs_leb_unmap(c, c->gc_lnum); |
1e51764a AB |
1628 | if (err) |
1629 | goto out; | |
1630 | ||
1631 | if (c->need_recovery) { | |
1632 | c->need_recovery = 0; | |
1633 | ubifs_msg("deferred recovery completed"); | |
1634 | } | |
1635 | ||
1636 | dbg_gen("re-mounted read-write"); | |
1637 | c->vfs_sb->s_flags &= ~MS_RDONLY; | |
1638 | c->remounting_rw = 0; | |
2953e73f | 1639 | c->always_chk_crc = 0; |
84abf972 | 1640 | err = dbg_check_space_info(c); |
1e51764a | 1641 | mutex_unlock(&c->umount_mutex); |
84abf972 | 1642 | return err; |
1e51764a AB |
1643 | |
1644 | out: | |
1645 | vfree(c->orph_buf); | |
1646 | c->orph_buf = NULL; | |
1647 | if (c->bgt) { | |
1648 | kthread_stop(c->bgt); | |
1649 | c->bgt = NULL; | |
1650 | } | |
1651 | free_wbufs(c); | |
1652 | vfree(c->ileb_buf); | |
1653 | c->ileb_buf = NULL; | |
1654 | ubifs_lpt_free(c, 1); | |
1655 | c->remounting_rw = 0; | |
2953e73f | 1656 | c->always_chk_crc = 0; |
1e51764a AB |
1657 | mutex_unlock(&c->umount_mutex); |
1658 | return err; | |
1659 | } | |
1660 | ||
1e51764a AB |
1661 | /** |
1662 | * ubifs_remount_ro - re-mount in read-only mode. | |
1663 | * @c: UBIFS file-system description object | |
1664 | * | |
84abf972 AB |
1665 | * We assume VFS has stopped writing. Possibly the background thread could be |
1666 | * running a commit, however kthread_stop will wait in that case. | |
1e51764a AB |
1667 | */ |
1668 | static void ubifs_remount_ro(struct ubifs_info *c) | |
1669 | { | |
1670 | int i, err; | |
1671 | ||
1672 | ubifs_assert(!c->need_recovery); | |
6ba87c9b | 1673 | ubifs_assert(!(c->vfs_sb->s_flags & MS_RDONLY)); |
e4d9b6cb | 1674 | |
1e51764a AB |
1675 | mutex_lock(&c->umount_mutex); |
1676 | if (c->bgt) { | |
1677 | kthread_stop(c->bgt); | |
1678 | c->bgt = NULL; | |
1679 | } | |
1680 | ||
84abf972 AB |
1681 | dbg_save_space_info(c); |
1682 | ||
1e51764a AB |
1683 | for (i = 0; i < c->jhead_cnt; i++) { |
1684 | ubifs_wbuf_sync(&c->jheads[i].wbuf); | |
f2c5dbd7 | 1685 | hrtimer_cancel(&c->jheads[i].wbuf.timer); |
1e51764a AB |
1686 | } |
1687 | ||
e4d9b6cb AB |
1688 | c->mst_node->flags &= ~cpu_to_le32(UBIFS_MST_DIRTY); |
1689 | c->mst_node->flags |= cpu_to_le32(UBIFS_MST_NO_ORPHS); | |
1690 | c->mst_node->gc_lnum = cpu_to_le32(c->gc_lnum); | |
1691 | err = ubifs_write_master(c); | |
1692 | if (err) | |
1693 | ubifs_ro_mode(c, err); | |
1694 | ||
1e51764a AB |
1695 | free_wbufs(c); |
1696 | vfree(c->orph_buf); | |
1697 | c->orph_buf = NULL; | |
1698 | vfree(c->ileb_buf); | |
1699 | c->ileb_buf = NULL; | |
1700 | ubifs_lpt_free(c, 1); | |
84abf972 AB |
1701 | err = dbg_check_space_info(c); |
1702 | if (err) | |
1703 | ubifs_ro_mode(c, err); | |
1e51764a AB |
1704 | mutex_unlock(&c->umount_mutex); |
1705 | } | |
1706 | ||
1707 | static void ubifs_put_super(struct super_block *sb) | |
1708 | { | |
1709 | int i; | |
1710 | struct ubifs_info *c = sb->s_fs_info; | |
1711 | ||
1712 | ubifs_msg("un-mount UBI device %d, volume %d", c->vi.ubi_num, | |
1713 | c->vi.vol_id); | |
6cfd0148 | 1714 | |
1e51764a AB |
1715 | /* |
1716 | * The following asserts are only valid if there has not been a failure | |
1717 | * of the media. For example, there will be dirty inodes if we failed | |
1718 | * to write them back because of I/O errors. | |
1719 | */ | |
1720 | ubifs_assert(atomic_long_read(&c->dirty_pg_cnt) == 0); | |
1721 | ubifs_assert(c->budg_idx_growth == 0); | |
7d32c2bb | 1722 | ubifs_assert(c->budg_dd_growth == 0); |
1e51764a AB |
1723 | ubifs_assert(c->budg_data_growth == 0); |
1724 | ||
1725 | /* | |
1726 | * The 'c->umount_lock' prevents races between UBIFS memory shrinker | |
1727 | * and file system un-mount. Namely, it prevents the shrinker from | |
1728 | * picking this superblock for shrinking - it will be just skipped if | |
1729 | * the mutex is locked. | |
1730 | */ | |
1731 | mutex_lock(&c->umount_mutex); | |
1732 | if (!(c->vfs_sb->s_flags & MS_RDONLY)) { | |
1733 | /* | |
1734 | * First of all kill the background thread to make sure it does | |
1735 | * not interfere with un-mounting and freeing resources. | |
1736 | */ | |
1737 | if (c->bgt) { | |
1738 | kthread_stop(c->bgt); | |
1739 | c->bgt = NULL; | |
1740 | } | |
1741 | ||
1742 | /* Synchronize write-buffers */ | |
1743 | if (c->jheads) | |
0b335b9d | 1744 | for (i = 0; i < c->jhead_cnt; i++) |
1e51764a | 1745 | ubifs_wbuf_sync(&c->jheads[i].wbuf); |
1e51764a AB |
1746 | |
1747 | /* | |
1748 | * On fatal errors c->ro_media is set to 1, in which case we do | |
1749 | * not write the master node. | |
1750 | */ | |
1751 | if (!c->ro_media) { | |
1752 | /* | |
1753 | * We are being cleanly unmounted which means the | |
1754 | * orphans were killed - indicate this in the master | |
1755 | * node. Also save the reserved GC LEB number. | |
1756 | */ | |
1757 | int err; | |
1758 | ||
1759 | c->mst_node->flags &= ~cpu_to_le32(UBIFS_MST_DIRTY); | |
1760 | c->mst_node->flags |= cpu_to_le32(UBIFS_MST_NO_ORPHS); | |
1761 | c->mst_node->gc_lnum = cpu_to_le32(c->gc_lnum); | |
1762 | err = ubifs_write_master(c); | |
1763 | if (err) | |
1764 | /* | |
1765 | * Recovery will attempt to fix the master area | |
1766 | * next mount, so we just print a message and | |
1767 | * continue to unmount normally. | |
1768 | */ | |
1769 | ubifs_err("failed to write master node, " | |
1770 | "error %d", err); | |
1771 | } | |
1772 | } | |
1773 | ||
1774 | ubifs_umount(c); | |
1775 | bdi_destroy(&c->bdi); | |
1776 | ubi_close_volume(c->ubi); | |
1777 | mutex_unlock(&c->umount_mutex); | |
1778 | kfree(c); | |
1779 | } | |
1780 | ||
1781 | static int ubifs_remount_fs(struct super_block *sb, int *flags, char *data) | |
1782 | { | |
1783 | int err; | |
1784 | struct ubifs_info *c = sb->s_fs_info; | |
1785 | ||
1786 | dbg_gen("old flags %#lx, new flags %#x", sb->s_flags, *flags); | |
1787 | ||
1788 | err = ubifs_parse_options(c, data, 1); | |
1789 | if (err) { | |
1790 | ubifs_err("invalid or unknown remount parameter"); | |
1791 | return err; | |
1792 | } | |
3477d204 | 1793 | |
1e51764a | 1794 | if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) { |
e4d9b6cb | 1795 | if (c->ro_media) { |
b466f17d | 1796 | ubifs_msg("cannot re-mount due to prior errors"); |
a2b9df3f | 1797 | return -EROFS; |
e4d9b6cb | 1798 | } |
1e51764a | 1799 | err = ubifs_remount_rw(c); |
e9d6bbc4 | 1800 | if (err) |
1e51764a | 1801 | return err; |
b466f17d AH |
1802 | } else if (!(sb->s_flags & MS_RDONLY) && (*flags & MS_RDONLY)) { |
1803 | if (c->ro_media) { | |
1804 | ubifs_msg("cannot re-mount due to prior errors"); | |
a2b9df3f | 1805 | return -EROFS; |
b466f17d | 1806 | } |
1e51764a | 1807 | ubifs_remount_ro(c); |
b466f17d | 1808 | } |
1e51764a | 1809 | |
3477d204 AB |
1810 | if (c->bulk_read == 1) |
1811 | bu_init(c); | |
1812 | else { | |
1813 | dbg_gen("disable bulk-read"); | |
1814 | kfree(c->bu.buf); | |
1815 | c->bu.buf = NULL; | |
1816 | } | |
1817 | ||
b221337a | 1818 | ubifs_assert(c->lst.taken_empty_lebs > 0); |
1e51764a AB |
1819 | return 0; |
1820 | } | |
1821 | ||
e8b81566 | 1822 | const struct super_operations ubifs_super_operations = { |
1e51764a AB |
1823 | .alloc_inode = ubifs_alloc_inode, |
1824 | .destroy_inode = ubifs_destroy_inode, | |
1825 | .put_super = ubifs_put_super, | |
1826 | .write_inode = ubifs_write_inode, | |
1827 | .delete_inode = ubifs_delete_inode, | |
1828 | .statfs = ubifs_statfs, | |
1829 | .dirty_inode = ubifs_dirty_inode, | |
1830 | .remount_fs = ubifs_remount_fs, | |
1831 | .show_options = ubifs_show_options, | |
1832 | .sync_fs = ubifs_sync_fs, | |
1833 | }; | |
1834 | ||
1835 | /** | |
1836 | * open_ubi - parse UBI device name string and open the UBI device. | |
1837 | * @name: UBI volume name | |
1838 | * @mode: UBI volume open mode | |
1839 | * | |
9722324e CC |
1840 | * The primary method of mounting UBIFS is by specifying the UBI volume |
1841 | * character device node path. However, UBIFS may also be mounted withoug any | |
1842 | * character device node using one of the following methods: | |
1843 | * | |
1844 | * o ubiX_Y - mount UBI device number X, volume Y; | |
1845 | * o ubiY - mount UBI device number 0, volume Y; | |
1e51764a AB |
1846 | * o ubiX:NAME - mount UBI device X, volume with name NAME; |
1847 | * o ubi:NAME - mount UBI device 0, volume with name NAME. | |
1848 | * | |
1849 | * Alternative '!' separator may be used instead of ':' (because some shells | |
1850 | * like busybox may interpret ':' as an NFS host name separator). This function | |
9722324e CC |
1851 | * returns UBI volume description object in case of success and a negative |
1852 | * error code in case of failure. | |
1e51764a AB |
1853 | */ |
1854 | static struct ubi_volume_desc *open_ubi(const char *name, int mode) | |
1855 | { | |
9722324e | 1856 | struct ubi_volume_desc *ubi; |
1e51764a AB |
1857 | int dev, vol; |
1858 | char *endptr; | |
1859 | ||
9722324e CC |
1860 | /* First, try to open using the device node path method */ |
1861 | ubi = ubi_open_volume_path(name, mode); | |
1862 | if (!IS_ERR(ubi)) | |
1863 | return ubi; | |
1864 | ||
1865 | /* Try the "nodev" method */ | |
1e51764a AB |
1866 | if (name[0] != 'u' || name[1] != 'b' || name[2] != 'i') |
1867 | return ERR_PTR(-EINVAL); | |
1868 | ||
1869 | /* ubi:NAME method */ | |
1870 | if ((name[3] == ':' || name[3] == '!') && name[4] != '\0') | |
1871 | return ubi_open_volume_nm(0, name + 4, mode); | |
1872 | ||
1873 | if (!isdigit(name[3])) | |
1874 | return ERR_PTR(-EINVAL); | |
1875 | ||
1876 | dev = simple_strtoul(name + 3, &endptr, 0); | |
1877 | ||
1878 | /* ubiY method */ | |
1879 | if (*endptr == '\0') | |
1880 | return ubi_open_volume(0, dev, mode); | |
1881 | ||
1882 | /* ubiX_Y method */ | |
1883 | if (*endptr == '_' && isdigit(endptr[1])) { | |
1884 | vol = simple_strtoul(endptr + 1, &endptr, 0); | |
1885 | if (*endptr != '\0') | |
1886 | return ERR_PTR(-EINVAL); | |
1887 | return ubi_open_volume(dev, vol, mode); | |
1888 | } | |
1889 | ||
1890 | /* ubiX:NAME method */ | |
1891 | if ((*endptr == ':' || *endptr == '!') && endptr[1] != '\0') | |
1892 | return ubi_open_volume_nm(dev, ++endptr, mode); | |
1893 | ||
1894 | return ERR_PTR(-EINVAL); | |
1895 | } | |
1896 | ||
1897 | static int ubifs_fill_super(struct super_block *sb, void *data, int silent) | |
1898 | { | |
1899 | struct ubi_volume_desc *ubi = sb->s_fs_info; | |
1900 | struct ubifs_info *c; | |
1901 | struct inode *root; | |
1902 | int err; | |
1903 | ||
1904 | c = kzalloc(sizeof(struct ubifs_info), GFP_KERNEL); | |
1905 | if (!c) | |
1906 | return -ENOMEM; | |
1907 | ||
1908 | spin_lock_init(&c->cnt_lock); | |
1909 | spin_lock_init(&c->cs_lock); | |
1910 | spin_lock_init(&c->buds_lock); | |
1911 | spin_lock_init(&c->space_lock); | |
1912 | spin_lock_init(&c->orphan_lock); | |
1913 | init_rwsem(&c->commit_sem); | |
1914 | mutex_init(&c->lp_mutex); | |
1915 | mutex_init(&c->tnc_mutex); | |
1916 | mutex_init(&c->log_mutex); | |
1917 | mutex_init(&c->mst_mutex); | |
1918 | mutex_init(&c->umount_mutex); | |
3477d204 | 1919 | mutex_init(&c->bu_mutex); |
1e51764a AB |
1920 | init_waitqueue_head(&c->cmt_wq); |
1921 | c->buds = RB_ROOT; | |
1922 | c->old_idx = RB_ROOT; | |
1923 | c->size_tree = RB_ROOT; | |
1924 | c->orph_tree = RB_ROOT; | |
1925 | INIT_LIST_HEAD(&c->infos_list); | |
1926 | INIT_LIST_HEAD(&c->idx_gc); | |
1927 | INIT_LIST_HEAD(&c->replay_list); | |
1928 | INIT_LIST_HEAD(&c->replay_buds); | |
1929 | INIT_LIST_HEAD(&c->uncat_list); | |
1930 | INIT_LIST_HEAD(&c->empty_list); | |
1931 | INIT_LIST_HEAD(&c->freeable_list); | |
1932 | INIT_LIST_HEAD(&c->frdi_idx_list); | |
1933 | INIT_LIST_HEAD(&c->unclean_leb_list); | |
1934 | INIT_LIST_HEAD(&c->old_buds); | |
1935 | INIT_LIST_HEAD(&c->orph_list); | |
1936 | INIT_LIST_HEAD(&c->orph_new); | |
1937 | ||
8379ea31 | 1938 | c->vfs_sb = sb; |
1e51764a | 1939 | c->highest_inum = UBIFS_FIRST_INO; |
1e51764a AB |
1940 | c->lhead_lnum = c->ltail_lnum = UBIFS_LOG_LNUM; |
1941 | ||
1942 | ubi_get_volume_info(ubi, &c->vi); | |
1943 | ubi_get_device_info(c->vi.ubi_num, &c->di); | |
1944 | ||
1945 | /* Re-open the UBI device in read-write mode */ | |
1946 | c->ubi = ubi_open_volume(c->vi.ubi_num, c->vi.vol_id, UBI_READWRITE); | |
1947 | if (IS_ERR(c->ubi)) { | |
1948 | err = PTR_ERR(c->ubi); | |
1949 | goto out_free; | |
1950 | } | |
1951 | ||
1952 | /* | |
0a883a05 | 1953 | * UBIFS provides 'backing_dev_info' in order to disable read-ahead. For |
1e51764a AB |
1954 | * UBIFS, I/O is not deferred, it is done immediately in readpage, |
1955 | * which means the user would have to wait not just for their own I/O | |
0a883a05 | 1956 | * but the read-ahead I/O as well i.e. completely pointless. |
1e51764a AB |
1957 | * |
1958 | * Read-ahead will be disabled because @c->bdi.ra_pages is 0. | |
1959 | */ | |
d993831f | 1960 | c->bdi.name = "ubifs", |
1e51764a AB |
1961 | c->bdi.capabilities = BDI_CAP_MAP_COPY; |
1962 | c->bdi.unplug_io_fn = default_unplug_io_fn; | |
1963 | err = bdi_init(&c->bdi); | |
1964 | if (err) | |
1965 | goto out_close; | |
7fcd9c3e DM |
1966 | err = bdi_register(&c->bdi, NULL, "ubifs_%d_%d", |
1967 | c->vi.ubi_num, c->vi.vol_id); | |
a979eff1 JA |
1968 | if (err) |
1969 | goto out_bdi; | |
1e51764a AB |
1970 | |
1971 | err = ubifs_parse_options(c, data, 0); | |
1972 | if (err) | |
1973 | goto out_bdi; | |
1974 | ||
32a88aa1 | 1975 | sb->s_bdi = &c->bdi; |
1e51764a AB |
1976 | sb->s_fs_info = c; |
1977 | sb->s_magic = UBIFS_SUPER_MAGIC; | |
1978 | sb->s_blocksize = UBIFS_BLOCK_SIZE; | |
1979 | sb->s_blocksize_bits = UBIFS_BLOCK_SHIFT; | |
1e51764a AB |
1980 | sb->s_maxbytes = c->max_inode_sz = key_max_inode_size(c); |
1981 | if (c->max_inode_sz > MAX_LFS_FILESIZE) | |
1982 | sb->s_maxbytes = c->max_inode_sz = MAX_LFS_FILESIZE; | |
1983 | sb->s_op = &ubifs_super_operations; | |
1984 | ||
1985 | mutex_lock(&c->umount_mutex); | |
1986 | err = mount_ubifs(c); | |
1987 | if (err) { | |
1988 | ubifs_assert(err < 0); | |
1989 | goto out_unlock; | |
1990 | } | |
1991 | ||
1992 | /* Read the root inode */ | |
1993 | root = ubifs_iget(sb, UBIFS_ROOT_INO); | |
1994 | if (IS_ERR(root)) { | |
1995 | err = PTR_ERR(root); | |
1996 | goto out_umount; | |
1997 | } | |
1998 | ||
1999 | sb->s_root = d_alloc_root(root); | |
2000 | if (!sb->s_root) | |
2001 | goto out_iput; | |
2002 | ||
2003 | mutex_unlock(&c->umount_mutex); | |
1e51764a AB |
2004 | return 0; |
2005 | ||
2006 | out_iput: | |
2007 | iput(root); | |
2008 | out_umount: | |
2009 | ubifs_umount(c); | |
2010 | out_unlock: | |
2011 | mutex_unlock(&c->umount_mutex); | |
2012 | out_bdi: | |
2013 | bdi_destroy(&c->bdi); | |
2014 | out_close: | |
2015 | ubi_close_volume(c->ubi); | |
2016 | out_free: | |
2017 | kfree(c); | |
2018 | return err; | |
2019 | } | |
2020 | ||
2021 | static int sb_test(struct super_block *sb, void *data) | |
2022 | { | |
2023 | dev_t *dev = data; | |
7c83f5cb | 2024 | struct ubifs_info *c = sb->s_fs_info; |
1e51764a | 2025 | |
7c83f5cb | 2026 | return c->vi.cdev == *dev; |
1e51764a AB |
2027 | } |
2028 | ||
2029 | static int ubifs_get_sb(struct file_system_type *fs_type, int flags, | |
2030 | const char *name, void *data, struct vfsmount *mnt) | |
2031 | { | |
2032 | struct ubi_volume_desc *ubi; | |
2033 | struct ubi_volume_info vi; | |
2034 | struct super_block *sb; | |
2035 | int err; | |
2036 | ||
2037 | dbg_gen("name %s, flags %#x", name, flags); | |
2038 | ||
2039 | /* | |
2040 | * Get UBI device number and volume ID. Mount it read-only so far | |
2041 | * because this might be a new mount point, and UBI allows only one | |
2042 | * read-write user at a time. | |
2043 | */ | |
2044 | ubi = open_ubi(name, UBI_READONLY); | |
2045 | if (IS_ERR(ubi)) { | |
2046 | ubifs_err("cannot open \"%s\", error %d", | |
2047 | name, (int)PTR_ERR(ubi)); | |
2048 | return PTR_ERR(ubi); | |
2049 | } | |
2050 | ubi_get_volume_info(ubi, &vi); | |
2051 | ||
2052 | dbg_gen("opened ubi%d_%d", vi.ubi_num, vi.vol_id); | |
2053 | ||
7c83f5cb | 2054 | sb = sget(fs_type, &sb_test, &set_anon_super, &vi.cdev); |
1e51764a AB |
2055 | if (IS_ERR(sb)) { |
2056 | err = PTR_ERR(sb); | |
2057 | goto out_close; | |
2058 | } | |
2059 | ||
2060 | if (sb->s_root) { | |
2061 | /* A new mount point for already mounted UBIFS */ | |
2062 | dbg_gen("this ubi volume is already mounted"); | |
2063 | if ((flags ^ sb->s_flags) & MS_RDONLY) { | |
2064 | err = -EBUSY; | |
2065 | goto out_deact; | |
2066 | } | |
2067 | } else { | |
2068 | sb->s_flags = flags; | |
2069 | /* | |
2070 | * Pass 'ubi' to 'fill_super()' in sb->s_fs_info where it is | |
2071 | * replaced by 'c'. | |
2072 | */ | |
2073 | sb->s_fs_info = ubi; | |
2074 | err = ubifs_fill_super(sb, data, flags & MS_SILENT ? 1 : 0); | |
2075 | if (err) | |
2076 | goto out_deact; | |
2077 | /* We do not support atime */ | |
2078 | sb->s_flags |= MS_ACTIVE | MS_NOATIME; | |
2079 | } | |
2080 | ||
2081 | /* 'fill_super()' opens ubi again so we must close it here */ | |
2082 | ubi_close_volume(ubi); | |
2083 | ||
a3ec947c SB |
2084 | simple_set_mnt(mnt, sb); |
2085 | return 0; | |
1e51764a AB |
2086 | |
2087 | out_deact: | |
6f5bbff9 | 2088 | deactivate_locked_super(sb); |
1e51764a AB |
2089 | out_close: |
2090 | ubi_close_volume(ubi); | |
2091 | return err; | |
2092 | } | |
2093 | ||
1e51764a AB |
2094 | static struct file_system_type ubifs_fs_type = { |
2095 | .name = "ubifs", | |
2096 | .owner = THIS_MODULE, | |
2097 | .get_sb = ubifs_get_sb, | |
7c83f5cb | 2098 | .kill_sb = kill_anon_super, |
1e51764a AB |
2099 | }; |
2100 | ||
2101 | /* | |
2102 | * Inode slab cache constructor. | |
2103 | */ | |
51cc5068 | 2104 | static void inode_slab_ctor(void *obj) |
1e51764a AB |
2105 | { |
2106 | struct ubifs_inode *ui = obj; | |
2107 | inode_init_once(&ui->vfs_inode); | |
2108 | } | |
2109 | ||
2110 | static int __init ubifs_init(void) | |
2111 | { | |
2112 | int err; | |
2113 | ||
2114 | BUILD_BUG_ON(sizeof(struct ubifs_ch) != 24); | |
2115 | ||
2116 | /* Make sure node sizes are 8-byte aligned */ | |
2117 | BUILD_BUG_ON(UBIFS_CH_SZ & 7); | |
2118 | BUILD_BUG_ON(UBIFS_INO_NODE_SZ & 7); | |
2119 | BUILD_BUG_ON(UBIFS_DENT_NODE_SZ & 7); | |
2120 | BUILD_BUG_ON(UBIFS_XENT_NODE_SZ & 7); | |
2121 | BUILD_BUG_ON(UBIFS_DATA_NODE_SZ & 7); | |
2122 | BUILD_BUG_ON(UBIFS_TRUN_NODE_SZ & 7); | |
2123 | BUILD_BUG_ON(UBIFS_SB_NODE_SZ & 7); | |
2124 | BUILD_BUG_ON(UBIFS_MST_NODE_SZ & 7); | |
2125 | BUILD_BUG_ON(UBIFS_REF_NODE_SZ & 7); | |
2126 | BUILD_BUG_ON(UBIFS_CS_NODE_SZ & 7); | |
2127 | BUILD_BUG_ON(UBIFS_ORPH_NODE_SZ & 7); | |
2128 | ||
2129 | BUILD_BUG_ON(UBIFS_MAX_DENT_NODE_SZ & 7); | |
2130 | BUILD_BUG_ON(UBIFS_MAX_XENT_NODE_SZ & 7); | |
2131 | BUILD_BUG_ON(UBIFS_MAX_DATA_NODE_SZ & 7); | |
2132 | BUILD_BUG_ON(UBIFS_MAX_INO_NODE_SZ & 7); | |
2133 | BUILD_BUG_ON(UBIFS_MAX_NODE_SZ & 7); | |
2134 | BUILD_BUG_ON(MIN_WRITE_SZ & 7); | |
2135 | ||
2136 | /* Check min. node size */ | |
2137 | BUILD_BUG_ON(UBIFS_INO_NODE_SZ < MIN_WRITE_SZ); | |
2138 | BUILD_BUG_ON(UBIFS_DENT_NODE_SZ < MIN_WRITE_SZ); | |
2139 | BUILD_BUG_ON(UBIFS_XENT_NODE_SZ < MIN_WRITE_SZ); | |
2140 | BUILD_BUG_ON(UBIFS_TRUN_NODE_SZ < MIN_WRITE_SZ); | |
2141 | ||
2142 | BUILD_BUG_ON(UBIFS_MAX_DENT_NODE_SZ > UBIFS_MAX_NODE_SZ); | |
2143 | BUILD_BUG_ON(UBIFS_MAX_XENT_NODE_SZ > UBIFS_MAX_NODE_SZ); | |
2144 | BUILD_BUG_ON(UBIFS_MAX_DATA_NODE_SZ > UBIFS_MAX_NODE_SZ); | |
2145 | BUILD_BUG_ON(UBIFS_MAX_INO_NODE_SZ > UBIFS_MAX_NODE_SZ); | |
2146 | ||
2147 | /* Defined node sizes */ | |
2148 | BUILD_BUG_ON(UBIFS_SB_NODE_SZ != 4096); | |
2149 | BUILD_BUG_ON(UBIFS_MST_NODE_SZ != 512); | |
2150 | BUILD_BUG_ON(UBIFS_INO_NODE_SZ != 160); | |
2151 | BUILD_BUG_ON(UBIFS_REF_NODE_SZ != 64); | |
2152 | ||
a1dc080c AB |
2153 | /* |
2154 | * We use 2 bit wide bit-fields to store compression type, which should | |
2155 | * be amended if more compressors are added. The bit-fields are: | |
553dea4d AB |
2156 | * @compr_type in 'struct ubifs_inode', @default_compr in |
2157 | * 'struct ubifs_info' and @compr_type in 'struct ubifs_mount_opts'. | |
a1dc080c AB |
2158 | */ |
2159 | BUILD_BUG_ON(UBIFS_COMPR_TYPES_CNT > 4); | |
2160 | ||
1e51764a AB |
2161 | /* |
2162 | * We require that PAGE_CACHE_SIZE is greater-than-or-equal-to | |
2163 | * UBIFS_BLOCK_SIZE. It is assumed that both are powers of 2. | |
2164 | */ | |
2165 | if (PAGE_CACHE_SIZE < UBIFS_BLOCK_SIZE) { | |
2166 | ubifs_err("VFS page cache size is %u bytes, but UBIFS requires" | |
2167 | " at least 4096 bytes", | |
2168 | (unsigned int)PAGE_CACHE_SIZE); | |
2169 | return -EINVAL; | |
2170 | } | |
2171 | ||
2172 | err = register_filesystem(&ubifs_fs_type); | |
2173 | if (err) { | |
2174 | ubifs_err("cannot register file system, error %d", err); | |
2175 | return err; | |
2176 | } | |
2177 | ||
2178 | err = -ENOMEM; | |
2179 | ubifs_inode_slab = kmem_cache_create("ubifs_inode_slab", | |
2180 | sizeof(struct ubifs_inode), 0, | |
2181 | SLAB_MEM_SPREAD | SLAB_RECLAIM_ACCOUNT, | |
2182 | &inode_slab_ctor); | |
2183 | if (!ubifs_inode_slab) | |
2184 | goto out_reg; | |
2185 | ||
2186 | register_shrinker(&ubifs_shrinker_info); | |
2187 | ||
2188 | err = ubifs_compressors_init(); | |
552ff317 AB |
2189 | if (err) |
2190 | goto out_shrinker; | |
2191 | ||
2192 | err = dbg_debugfs_init(); | |
1e51764a AB |
2193 | if (err) |
2194 | goto out_compr; | |
2195 | ||
2196 | return 0; | |
2197 | ||
2198 | out_compr: | |
552ff317 AB |
2199 | ubifs_compressors_exit(); |
2200 | out_shrinker: | |
1e51764a AB |
2201 | unregister_shrinker(&ubifs_shrinker_info); |
2202 | kmem_cache_destroy(ubifs_inode_slab); | |
2203 | out_reg: | |
2204 | unregister_filesystem(&ubifs_fs_type); | |
2205 | return err; | |
2206 | } | |
2207 | /* late_initcall to let compressors initialize first */ | |
2208 | late_initcall(ubifs_init); | |
2209 | ||
2210 | static void __exit ubifs_exit(void) | |
2211 | { | |
2212 | ubifs_assert(list_empty(&ubifs_infos)); | |
2213 | ubifs_assert(atomic_long_read(&ubifs_clean_zn_cnt) == 0); | |
2214 | ||
552ff317 | 2215 | dbg_debugfs_exit(); |
1e51764a AB |
2216 | ubifs_compressors_exit(); |
2217 | unregister_shrinker(&ubifs_shrinker_info); | |
2218 | kmem_cache_destroy(ubifs_inode_slab); | |
2219 | unregister_filesystem(&ubifs_fs_type); | |
2220 | } | |
2221 | module_exit(ubifs_exit); | |
2222 | ||
2223 | MODULE_LICENSE("GPL"); | |
2224 | MODULE_VERSION(__stringify(UBIFS_VERSION)); | |
2225 | MODULE_AUTHOR("Artem Bityutskiy, Adrian Hunter"); | |
2226 | MODULE_DESCRIPTION("UBIFS - UBI File System"); |