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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> |
33 | #include <linux/kthread.h> |
34 | #include <linux/parser.h> |
35 | #include <linux/seq_file.h> |
36 | #include <linux/mount.h> |
37 | #include <linux/math64.h> |
38 | #include <linux/writeback.h> |
39 | #include "ubifs.h" |
40 | |
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 | |
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 | |
159 | /* Disable read-ahead */ |
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 | */ |
286 | static int ubifs_write_inode(struct inode *inode, struct writeback_control *wbc) |
287 | { |
288 | int err = 0; |
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 | |
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) { |
316 | err = ubifs_jnl_write_inode(c, inode); |
317 | if (err) |
318 | ubifs_err("can't write inode %lu, error %d", |
319 | inode->i_ino, err); |
320 | else |
321 | err = dbg_check_inode_size(c, inode, ui->ui_size); |
322 | } |
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; |
334 | struct ubifs_inode *ui = ubifs_inode(inode); |
335 | |
336 | if (ui->xattr) |
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 | |
344 | dbg_gen("inode %lu, mode %#x", inode->i_ino, (int)inode->i_mode); |
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 | |
352 | ui->ui_size = inode->i_size = 0; |
353 | err = ubifs_jnl_delete_inode(c, inode); |
354 | if (err) |
355 | /* |
356 | * Worst case we have a lost orphan inode wasting space, so a |
357 | * simple error message is OK here. |
358 | */ |
359 | ubifs_err("can't delete inode %lu, error %d", |
360 | inode->i_ino, err); |
361 | |
362 | out: |
363 | if (ui->dirty) |
364 | ubifs_release_dirty_inode_budget(c, ui); |
365 | else { |
366 | /* We've deleted something - clean the "no space" flags */ |
367 | c->nospace = c->nospace_rp = 0; |
368 | smp_wmb(); |
369 | } |
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; |
388 | __le32 *uuid = (__le32 *)c->uuid; |
389 | |
390 | free = ubifs_get_free_space(c); |
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; |
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]); |
407 | ubifs_assert(buf->f_bfree <= c->block_cnt); |
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 | |
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 | |
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 | |
430 | if (c->mount_opts.override_compr) { |
431 | seq_printf(s, ",compr=%s", |
432 | ubifs_compr_name(c->mount_opts.compr_type)); |
433 | } |
434 | |
435 | return 0; |
436 | } |
437 | |
438 | static int ubifs_sync_fs(struct super_block *sb, int wait) |
439 | { |
440 | int i, err; |
441 | struct ubifs_info *c = sb->s_fs_info; |
442 | |
443 | /* |
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 |
446 | * '->sync_fs()' call, with non-zero @wait. |
447 | */ |
448 | if (!wait) |
449 | return 0; |
450 | |
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 | |
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 | */ |
468 | err = ubifs_run_commit(c); |
469 | if (err) |
470 | return err; |
471 | |
472 | return ubi_sync(c->vi.ubi_num); |
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 | /* |
571 | * Initialize dead and dark LEB space watermarks. See gc.c for comments |
572 | * about these values. |
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 | |
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; |
583 | |
584 | /* Buffer size for bulk-reads */ |
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; |
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 | /* |
612 | * init_constants_sb - initialize UBIFS constants. |
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 | */ |
620 | static int init_constants_sb(struct ubifs_info *c) |
621 | { |
622 | int tmp, err; |
623 | long long tmp64; |
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 | */ |
650 | tmp64 = c->max_bud_bytes + c->leb_size - 1; |
651 | c->max_bud_cnt = div_u64(tmp64, c->leb_size); |
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 | */ |
687 | tmp64 = (long long)(c->jhead_cnt + 1) * c->leb_size + 1; |
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 | |
697 | /* Initialize effective LEB size used in budgeting calculations */ |
698 | c->idx_leb_size = c->leb_size - c->max_idx_node_sz; |
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 | |
714 | c->min_idx_lebs = ubifs_calc_min_idx_lebs(c); |
715 | c->report_rp_size = ubifs_reported_space(c, c->rp_size); |
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 | * |
722 | * Subtract the LEB reserved for GC, the LEB which is reserved for |
723 | * deletions, minimum LEBs for the index, and assume only one journal |
724 | * head is available. |
725 | */ |
726 | tmp64 = c->main_lebs - 1 - 1 - MIN_INDEX_LEBS - c->jhead_cnt + 1; |
727 | tmp64 *= (long long)c->leb_size - c->leb_overhead; |
728 | tmp64 = ubifs_reported_space(c, tmp64); |
729 | c->block_cnt = tmp64 >> UBIFS_BLOCK_SHIFT; |
730 | } |
731 | |
732 | /** |
733 | * take_gc_lnum - reserve GC LEB. |
734 | * @c: UBIFS file-system description object |
735 | * |
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. |
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 | |
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; |
791 | c->jheads[GCHD].wbuf.no_timer = 1; |
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 |
902 | * Opt_bulk_read: enable bulk-reads |
903 | * Opt_no_bulk_read: disable bulk-reads |
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 |
906 | * Opt_override_compr: override default compressor |
907 | * Opt_err: just end of array marker |
908 | */ |
909 | enum { |
910 | Opt_fast_unmount, |
911 | Opt_norm_unmount, |
912 | Opt_bulk_read, |
913 | Opt_no_bulk_read, |
914 | Opt_chk_data_crc, |
915 | Opt_no_chk_data_crc, |
916 | Opt_override_compr, |
917 | Opt_err, |
918 | }; |
919 | |
920 | static const match_table_t tokens = { |
921 | {Opt_fast_unmount, "fast_unmount"}, |
922 | {Opt_norm_unmount, "norm_unmount"}, |
923 | {Opt_bulk_read, "bulk_read"}, |
924 | {Opt_no_bulk_read, "no_bulk_read"}, |
925 | {Opt_chk_data_crc, "chk_data_crc"}, |
926 | {Opt_no_chk_data_crc, "no_chk_data_crc"}, |
927 | {Opt_override_compr, "compr=%s"}, |
928 | {Opt_err, NULL}, |
929 | }; |
930 | |
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 | |
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) { |
978 | /* |
979 | * %Opt_fast_unmount and %Opt_norm_unmount options are ignored. |
980 | * We accept them in order to be backward-compatible. But this |
981 | * should be removed at some point. |
982 | */ |
983 | case Opt_fast_unmount: |
984 | c->mount_opts.unmount_mode = 2; |
985 | break; |
986 | case Opt_norm_unmount: |
987 | c->mount_opts.unmount_mode = 1; |
988 | break; |
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; |
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; |
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 | } |
1027 | default: |
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 | } |
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 | |
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 | |
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); |
1119 | return -ENOSPC; |
1120 | } |
1121 | return 0; |
1122 | } |
1123 | |
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 | |
1145 | err = ubifs_debugging_init(c); |
1146 | if (err) |
1147 | return err; |
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 | |
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 | */ |
1197 | c->always_chk_crc = 1; |
1198 | |
1199 | err = ubifs_read_superblock(c); |
1200 | if (err) |
1201 | goto out_free; |
1202 | |
1203 | /* |
1204 | * Make sure the compressor which is set as default in the superblock |
1205 | * or overridden by mount options is actually compiled in. |
1206 | */ |
1207 | if (!ubifs_compr_present(c->default_compr)) { |
1208 | ubifs_err("'compressor \"%s\" is not compiled in", |
1209 | ubifs_compr_name(c->default_compr)); |
1210 | err = -ENOTSUPP; |
1211 | goto out_free; |
1212 | } |
1213 | |
1214 | err = init_constants_sb(c); |
1215 | if (err) |
1216 | goto out_free; |
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; |
1223 | goto out_free; |
1224 | } |
1225 | |
1226 | sprintf(c->bgt_name, BGT_NAME_PATTERN, c->vi.ubi_num, c->vi.vol_id); |
1227 | if (!mounted_read_only) { |
1228 | err = alloc_wbufs(c); |
1229 | if (err) |
1230 | goto out_cbuf; |
1231 | |
1232 | /* Create background thread */ |
1233 | c->bgt = kthread_create(ubifs_bg_thread, c, "%s", c->bgt_name); |
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 | |
1248 | init_constants_master(c); |
1249 | |
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 | |
1281 | /* Calculate 'min_idx_lebs' after journal replay */ |
1282 | c->min_idx_lebs = ubifs_calc_min_idx_lebs(c); |
1283 | |
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 | |
1291 | err = check_free_space(c); |
1292 | if (err) |
1293 | goto out_orphans; |
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); |
1310 | } else { |
1311 | err = take_gc_lnum(c); |
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 | } |
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; |
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; |
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"); |
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); |
1359 | } |
1360 | } else |
1361 | ubifs_assert(c->lst.taken_empty_lebs > 0); |
1362 | |
1363 | err = dbg_check_filesystem(c); |
1364 | if (err) |
1365 | goto out_infos; |
1366 | |
1367 | err = dbg_debugfs_init_fs(c); |
1368 | if (err) |
1369 | goto out_infos; |
1370 | |
1371 | c->always_chk_crc = 0; |
1372 | |
1373 | ubifs_msg("mounted UBI device %d, volume %d, name \"%s\"", |
1374 | c->vi.ubi_num, c->vi.vol_id, c->vi.name); |
1375 | if (mounted_read_only) |
1376 | ubifs_msg("mounted read-only"); |
1377 | x = (long long)c->main_lebs * c->leb_size; |
1378 | ubifs_msg("file system size: %lld bytes (%lld KiB, %lld MiB, %d " |
1379 | "LEBs)", x, x >> 10, x >> 20, c->main_lebs); |
1380 | x = (long long)c->log_lebs * c->leb_size + c->max_bud_bytes; |
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); |
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); |
1386 | ubifs_msg("default compressor: %s", ubifs_compr_name(c->default_compr)); |
1387 | ubifs_msg("reserved for root: %llu bytes (%llu KiB)", |
1388 | c->report_rp_size, c->report_rp_size >> 10); |
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)", |
1393 | c->leb_size, c->leb_size >> 10); |
1394 | dbg_msg("data journal heads: %d", |
1395 | c->jhead_cnt - NONDATA_JHEADS_CNT); |
1396 | dbg_msg("UUID: %pUB", c->uuid); |
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); |
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); |
1424 | dbg_msg("dead watermark: %d", c->dead_wm); |
1425 | dbg_msg("dark watermark: %d", c->dark_wm); |
1426 | dbg_msg("LEB overhead: %d", c->leb_overhead); |
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); |
1462 | out_free: |
1463 | kfree(c->bu.buf); |
1464 | vfree(c->ileb_buf); |
1465 | vfree(c->sbuf); |
1466 | kfree(c->bottom_up_buf); |
1467 | ubifs_debugging_exit(c); |
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 | |
1485 | dbg_debugfs_exit_fs(c); |
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); |
1501 | kfree(c->bu.buf); |
1502 | vfree(c->ileb_buf); |
1503 | vfree(c->sbuf); |
1504 | kfree(c->bottom_up_buf); |
1505 | ubifs_debugging_exit(c); |
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 | |
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 | |
1529 | mutex_lock(&c->umount_mutex); |
1530 | dbg_save_space_info(c); |
1531 | c->remounting_rw = 1; |
1532 | c->always_chk_crc = 1; |
1533 | |
1534 | err = check_free_space(c); |
1535 | if (err) |
1536 | goto out; |
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; |
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; |
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 */ |
1598 | c->bgt = kthread_create(ubifs_bg_thread, c, "%s", c->bgt_name); |
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); |
1604 | goto out; |
1605 | } |
1606 | wake_up_process(c->bgt); |
1607 | |
1608 | c->orph_buf = vmalloc(c->leb_size); |
1609 | if (!c->orph_buf) { |
1610 | err = -ENOMEM; |
1611 | goto out; |
1612 | } |
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 |
1627 | err = ubifs_leb_unmap(c, c->gc_lnum); |
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; |
1639 | c->always_chk_crc = 0; |
1640 | err = dbg_check_space_info(c); |
1641 | mutex_unlock(&c->umount_mutex); |
1642 | return err; |
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; |
1656 | c->always_chk_crc = 0; |
1657 | mutex_unlock(&c->umount_mutex); |
1658 | return err; |
1659 | } |
1660 | |
1661 | /** |
1662 | * ubifs_remount_ro - re-mount in read-only mode. |
1663 | * @c: UBIFS file-system description object |
1664 | * |
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. |
1667 | */ |
1668 | static void ubifs_remount_ro(struct ubifs_info *c) |
1669 | { |
1670 | int i, err; |
1671 | |
1672 | ubifs_assert(!c->need_recovery); |
1673 | ubifs_assert(!(c->vfs_sb->s_flags & MS_RDONLY)); |
1674 | |
1675 | mutex_lock(&c->umount_mutex); |
1676 | if (c->bgt) { |
1677 | kthread_stop(c->bgt); |
1678 | c->bgt = NULL; |
1679 | } |
1680 | |
1681 | dbg_save_space_info(c); |
1682 | |
1683 | for (i = 0; i < c->jhead_cnt; i++) { |
1684 | ubifs_wbuf_sync(&c->jheads[i].wbuf); |
1685 | hrtimer_cancel(&c->jheads[i].wbuf.timer); |
1686 | } |
1687 | |
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 | |
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); |
1701 | err = dbg_check_space_info(c); |
1702 | if (err) |
1703 | ubifs_ro_mode(c, err); |
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); |
1714 | |
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); |
1722 | ubifs_assert(c->budg_dd_growth == 0); |
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) |
1744 | for (i = 0; i < c->jhead_cnt; i++) |
1745 | ubifs_wbuf_sync(&c->jheads[i].wbuf); |
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 | } |
1793 | |
1794 | if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) { |
1795 | if (c->ro_media) { |
1796 | ubifs_msg("cannot re-mount due to prior errors"); |
1797 | return -EROFS; |
1798 | } |
1799 | err = ubifs_remount_rw(c); |
1800 | if (err) |
1801 | return err; |
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"); |
1805 | return -EROFS; |
1806 | } |
1807 | ubifs_remount_ro(c); |
1808 | } |
1809 | |
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 | |
1818 | ubifs_assert(c->lst.taken_empty_lebs > 0); |
1819 | return 0; |
1820 | } |
1821 | |
1822 | const struct super_operations ubifs_super_operations = { |
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 | * |
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; |
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 |
1851 | * returns UBI volume description object in case of success and a negative |
1852 | * error code in case of failure. |
1853 | */ |
1854 | static struct ubi_volume_desc *open_ubi(const char *name, int mode) |
1855 | { |
1856 | struct ubi_volume_desc *ubi; |
1857 | int dev, vol; |
1858 | char *endptr; |
1859 | |
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 */ |
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); |
1919 | mutex_init(&c->bu_mutex); |
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 | |
1938 | c->vfs_sb = sb; |
1939 | c->highest_inum = UBIFS_FIRST_INO; |
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 | /* |
1953 | * UBIFS provides 'backing_dev_info' in order to disable read-ahead. For |
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 |
1956 | * but the read-ahead I/O as well i.e. completely pointless. |
1957 | * |
1958 | * Read-ahead will be disabled because @c->bdi.ra_pages is 0. |
1959 | */ |
1960 | c->bdi.name = "ubifs", |
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; |
1966 | err = bdi_register(&c->bdi, NULL, "ubifs_%d_%d", |
1967 | c->vi.ubi_num, c->vi.vol_id); |
1968 | if (err) |
1969 | goto out_bdi; |
1970 | |
1971 | err = ubifs_parse_options(c, data, 0); |
1972 | if (err) |
1973 | goto out_bdi; |
1974 | |
1975 | sb->s_bdi = &c->bdi; |
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; |
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); |
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; |
2024 | struct ubifs_info *c = sb->s_fs_info; |
2025 | |
2026 | return c->vi.cdev == *dev; |
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 | |
2054 | sb = sget(fs_type, &sb_test, &set_anon_super, &vi.cdev); |
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 | |
2084 | simple_set_mnt(mnt, sb); |
2085 | return 0; |
2086 | |
2087 | out_deact: |
2088 | deactivate_locked_super(sb); |
2089 | out_close: |
2090 | ubi_close_volume(ubi); |
2091 | return err; |
2092 | } |
2093 | |
2094 | static struct file_system_type ubifs_fs_type = { |
2095 | .name = "ubifs", |
2096 | .owner = THIS_MODULE, |
2097 | .get_sb = ubifs_get_sb, |
2098 | .kill_sb = kill_anon_super, |
2099 | }; |
2100 | |
2101 | /* |
2102 | * Inode slab cache constructor. |
2103 | */ |
2104 | static void inode_slab_ctor(void *obj) |
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 | |
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: |
2156 | * @compr_type in 'struct ubifs_inode', @default_compr in |
2157 | * 'struct ubifs_info' and @compr_type in 'struct ubifs_mount_opts'. |
2158 | */ |
2159 | BUILD_BUG_ON(UBIFS_COMPR_TYPES_CNT > 4); |
2160 | |
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(); |
2189 | if (err) |
2190 | goto out_shrinker; |
2191 | |
2192 | err = dbg_debugfs_init(); |
2193 | if (err) |
2194 | goto out_compr; |
2195 | |
2196 | return 0; |
2197 | |
2198 | out_compr: |
2199 | ubifs_compressors_exit(); |
2200 | out_shrinker: |
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 | |
2215 | dbg_debugfs_exit(); |
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"); |
2227 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9