Commit | Line | Data |
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2b27bdcc | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1e51764a AB |
2 | /* |
3 | * This file is part of UBIFS. | |
4 | * | |
5 | * Copyright (C) 2006-2008 Nokia Corporation. | |
6 | * | |
1e51764a AB |
7 | * Authors: Artem Bityutskiy (Битюцкий Артём) |
8 | * Adrian Hunter | |
9 | */ | |
10 | ||
11 | /* | |
12 | * This file implements UBIFS initialization and VFS superblock operations. Some | |
13 | * initialization stuff which is rather large and complex is placed at | |
14 | * corresponding subsystems, but most of it is here. | |
15 | */ | |
16 | ||
17 | #include <linux/init.h> | |
18 | #include <linux/slab.h> | |
19 | #include <linux/module.h> | |
20 | #include <linux/ctype.h> | |
1e51764a AB |
21 | #include <linux/kthread.h> |
22 | #include <linux/parser.h> | |
23 | #include <linux/seq_file.h> | |
24 | #include <linux/mount.h> | |
4d61db4f | 25 | #include <linux/math64.h> |
304d427c | 26 | #include <linux/writeback.h> |
1e51764a AB |
27 | #include "ubifs.h" |
28 | ||
a7a8f4a1 MK |
29 | static int ubifs_default_version_set(const char *val, const struct kernel_param *kp) |
30 | { | |
31 | int n = 0, ret; | |
32 | ||
33 | ret = kstrtoint(val, 10, &n); | |
34 | if (ret != 0 || n < 4 || n > UBIFS_FORMAT_VERSION) | |
35 | return -EINVAL; | |
36 | return param_set_int(val, kp); | |
37 | } | |
38 | ||
39 | static const struct kernel_param_ops ubifs_default_version_ops = { | |
40 | .set = ubifs_default_version_set, | |
41 | .get = param_get_int, | |
42 | }; | |
43 | ||
44 | int ubifs_default_version = UBIFS_FORMAT_VERSION; | |
45 | module_param_cb(default_version, &ubifs_default_version_ops, &ubifs_default_version, 0600); | |
46 | ||
39ce81ce AB |
47 | /* |
48 | * Maximum amount of memory we may 'kmalloc()' without worrying that we are | |
49 | * allocating too much. | |
50 | */ | |
51 | #define UBIFS_KMALLOC_OK (128*1024) | |
52 | ||
1e51764a | 53 | /* Slab cache for UBIFS inodes */ |
e996bfd4 | 54 | static struct kmem_cache *ubifs_inode_slab; |
1e51764a AB |
55 | |
56 | /* UBIFS TNC shrinker description */ | |
57 | static struct shrinker ubifs_shrinker_info = { | |
1ab6c499 DC |
58 | .scan_objects = ubifs_shrink_scan, |
59 | .count_objects = ubifs_shrink_count, | |
1e51764a AB |
60 | .seeks = DEFAULT_SEEKS, |
61 | }; | |
62 | ||
63 | /** | |
64 | * validate_inode - validate inode. | |
65 | * @c: UBIFS file-system description object | |
66 | * @inode: the inode to validate | |
67 | * | |
68 | * This is a helper function for 'ubifs_iget()' which validates various fields | |
69 | * of a newly built inode to make sure they contain sane values and prevent | |
70 | * possible vulnerabilities. Returns zero if the inode is all right and | |
71 | * a non-zero error code if not. | |
72 | */ | |
73 | static int validate_inode(struct ubifs_info *c, const struct inode *inode) | |
74 | { | |
75 | int err; | |
76 | const struct ubifs_inode *ui = ubifs_inode(inode); | |
77 | ||
78 | if (inode->i_size > c->max_inode_sz) { | |
235c362b | 79 | ubifs_err(c, "inode is too large (%lld)", |
1e51764a AB |
80 | (long long)inode->i_size); |
81 | return 1; | |
82 | } | |
83 | ||
b793a8c8 | 84 | if (ui->compr_type >= UBIFS_COMPR_TYPES_CNT) { |
235c362b | 85 | ubifs_err(c, "unknown compression type %d", ui->compr_type); |
1e51764a AB |
86 | return 2; |
87 | } | |
88 | ||
89 | if (ui->xattr_names + ui->xattr_cnt > XATTR_LIST_MAX) | |
90 | return 3; | |
91 | ||
92 | if (ui->data_len < 0 || ui->data_len > UBIFS_MAX_INO_DATA) | |
93 | return 4; | |
94 | ||
a29fa9df | 95 | if (ui->xattr && !S_ISREG(inode->i_mode)) |
1e51764a AB |
96 | return 5; |
97 | ||
6eb61d58 | 98 | if (!ubifs_compr_present(c, ui->compr_type)) { |
235c362b | 99 | ubifs_warn(c, "inode %lu uses '%s' compression, but it was not compiled in", |
6eb61d58 | 100 | inode->i_ino, ubifs_compr_name(c, ui->compr_type)); |
1e51764a AB |
101 | } |
102 | ||
1b51e983 | 103 | err = dbg_check_dir(c, inode); |
1e51764a AB |
104 | return err; |
105 | } | |
106 | ||
107 | struct inode *ubifs_iget(struct super_block *sb, unsigned long inum) | |
108 | { | |
109 | int err; | |
110 | union ubifs_key key; | |
111 | struct ubifs_ino_node *ino; | |
112 | struct ubifs_info *c = sb->s_fs_info; | |
113 | struct inode *inode; | |
114 | struct ubifs_inode *ui; | |
115 | ||
116 | dbg_gen("inode %lu", inum); | |
117 | ||
118 | inode = iget_locked(sb, inum); | |
119 | if (!inode) | |
120 | return ERR_PTR(-ENOMEM); | |
121 | if (!(inode->i_state & I_NEW)) | |
122 | return inode; | |
123 | ui = ubifs_inode(inode); | |
124 | ||
125 | ino = kmalloc(UBIFS_MAX_INO_NODE_SZ, GFP_NOFS); | |
126 | if (!ino) { | |
127 | err = -ENOMEM; | |
128 | goto out; | |
129 | } | |
130 | ||
131 | ino_key_init(c, &key, inode->i_ino); | |
132 | ||
133 | err = ubifs_tnc_lookup(c, &key, ino); | |
134 | if (err) | |
135 | goto out_ino; | |
136 | ||
8c1c5f26 | 137 | inode->i_flags |= S_NOCMTIME; |
e3d73dea SH |
138 | |
139 | if (!IS_ENABLED(CONFIG_UBIFS_ATIME_SUPPORT)) | |
140 | inode->i_flags |= S_NOATIME; | |
141 | ||
bfe86848 | 142 | set_nlink(inode, le32_to_cpu(ino->nlink)); |
39241beb EB |
143 | i_uid_write(inode, le32_to_cpu(ino->uid)); |
144 | i_gid_write(inode, le32_to_cpu(ino->gid)); | |
1e51764a AB |
145 | inode->i_atime.tv_sec = (int64_t)le64_to_cpu(ino->atime_sec); |
146 | inode->i_atime.tv_nsec = le32_to_cpu(ino->atime_nsec); | |
147 | inode->i_mtime.tv_sec = (int64_t)le64_to_cpu(ino->mtime_sec); | |
148 | inode->i_mtime.tv_nsec = le32_to_cpu(ino->mtime_nsec); | |
149 | inode->i_ctime.tv_sec = (int64_t)le64_to_cpu(ino->ctime_sec); | |
150 | inode->i_ctime.tv_nsec = le32_to_cpu(ino->ctime_nsec); | |
151 | inode->i_mode = le32_to_cpu(ino->mode); | |
152 | inode->i_size = le64_to_cpu(ino->size); | |
153 | ||
154 | ui->data_len = le32_to_cpu(ino->data_len); | |
155 | ui->flags = le32_to_cpu(ino->flags); | |
156 | ui->compr_type = le16_to_cpu(ino->compr_type); | |
157 | ui->creat_sqnum = le64_to_cpu(ino->creat_sqnum); | |
158 | ui->xattr_cnt = le32_to_cpu(ino->xattr_cnt); | |
159 | ui->xattr_size = le32_to_cpu(ino->xattr_size); | |
160 | ui->xattr_names = le32_to_cpu(ino->xattr_names); | |
161 | ui->synced_i_size = ui->ui_size = inode->i_size; | |
162 | ||
163 | ui->xattr = (ui->flags & UBIFS_XATTR_FL) ? 1 : 0; | |
164 | ||
165 | err = validate_inode(c, inode); | |
166 | if (err) | |
167 | goto out_invalid; | |
168 | ||
1e51764a AB |
169 | switch (inode->i_mode & S_IFMT) { |
170 | case S_IFREG: | |
171 | inode->i_mapping->a_ops = &ubifs_file_address_operations; | |
172 | inode->i_op = &ubifs_file_inode_operations; | |
173 | inode->i_fop = &ubifs_file_operations; | |
174 | if (ui->xattr) { | |
175 | ui->data = kmalloc(ui->data_len + 1, GFP_NOFS); | |
176 | if (!ui->data) { | |
177 | err = -ENOMEM; | |
178 | goto out_ino; | |
179 | } | |
180 | memcpy(ui->data, ino->data, ui->data_len); | |
181 | ((char *)ui->data)[ui->data_len] = '\0'; | |
182 | } else if (ui->data_len != 0) { | |
183 | err = 10; | |
184 | goto out_invalid; | |
185 | } | |
186 | break; | |
187 | case S_IFDIR: | |
188 | inode->i_op = &ubifs_dir_inode_operations; | |
189 | inode->i_fop = &ubifs_dir_operations; | |
190 | if (ui->data_len != 0) { | |
191 | err = 11; | |
192 | goto out_invalid; | |
193 | } | |
194 | break; | |
195 | case S_IFLNK: | |
196 | inode->i_op = &ubifs_symlink_inode_operations; | |
197 | if (ui->data_len <= 0 || ui->data_len > UBIFS_MAX_INO_DATA) { | |
198 | err = 12; | |
199 | goto out_invalid; | |
200 | } | |
201 | ui->data = kmalloc(ui->data_len + 1, GFP_NOFS); | |
202 | if (!ui->data) { | |
203 | err = -ENOMEM; | |
204 | goto out_ino; | |
205 | } | |
206 | memcpy(ui->data, ino->data, ui->data_len); | |
207 | ((char *)ui->data)[ui->data_len] = '\0'; | |
208 | break; | |
209 | case S_IFBLK: | |
210 | case S_IFCHR: | |
211 | { | |
212 | dev_t rdev; | |
213 | union ubifs_dev_desc *dev; | |
214 | ||
215 | ui->data = kmalloc(sizeof(union ubifs_dev_desc), GFP_NOFS); | |
216 | if (!ui->data) { | |
217 | err = -ENOMEM; | |
218 | goto out_ino; | |
219 | } | |
220 | ||
221 | dev = (union ubifs_dev_desc *)ino->data; | |
222 | if (ui->data_len == sizeof(dev->new)) | |
223 | rdev = new_decode_dev(le32_to_cpu(dev->new)); | |
224 | else if (ui->data_len == sizeof(dev->huge)) | |
225 | rdev = huge_decode_dev(le64_to_cpu(dev->huge)); | |
226 | else { | |
227 | err = 13; | |
228 | goto out_invalid; | |
229 | } | |
230 | memcpy(ui->data, ino->data, ui->data_len); | |
231 | inode->i_op = &ubifs_file_inode_operations; | |
232 | init_special_inode(inode, inode->i_mode, rdev); | |
233 | break; | |
234 | } | |
235 | case S_IFSOCK: | |
236 | case S_IFIFO: | |
237 | inode->i_op = &ubifs_file_inode_operations; | |
238 | init_special_inode(inode, inode->i_mode, 0); | |
239 | if (ui->data_len != 0) { | |
240 | err = 14; | |
241 | goto out_invalid; | |
242 | } | |
243 | break; | |
244 | default: | |
245 | err = 15; | |
246 | goto out_invalid; | |
247 | } | |
248 | ||
249 | kfree(ino); | |
250 | ubifs_set_inode_flags(inode); | |
251 | unlock_new_inode(inode); | |
252 | return inode; | |
253 | ||
254 | out_invalid: | |
235c362b | 255 | ubifs_err(c, "inode %lu validation failed, error %d", inode->i_ino, err); |
a33e30a0 | 256 | ubifs_dump_node(c, ino, UBIFS_MAX_INO_NODE_SZ); |
edf6be24 | 257 | ubifs_dump_inode(c, inode); |
1e51764a AB |
258 | err = -EINVAL; |
259 | out_ino: | |
260 | kfree(ino); | |
261 | out: | |
235c362b | 262 | ubifs_err(c, "failed to read inode %lu, error %d", inode->i_ino, err); |
1e51764a AB |
263 | iget_failed(inode); |
264 | return ERR_PTR(err); | |
265 | } | |
266 | ||
267 | static struct inode *ubifs_alloc_inode(struct super_block *sb) | |
268 | { | |
269 | struct ubifs_inode *ui; | |
270 | ||
fd60b288 | 271 | ui = alloc_inode_sb(sb, ubifs_inode_slab, GFP_NOFS); |
1e51764a AB |
272 | if (!ui) |
273 | return NULL; | |
274 | ||
275 | memset((void *)ui + sizeof(struct inode), 0, | |
276 | sizeof(struct ubifs_inode) - sizeof(struct inode)); | |
277 | mutex_init(&ui->ui_mutex); | |
f4e3634a | 278 | init_rwsem(&ui->xattr_sem); |
1e51764a AB |
279 | spin_lock_init(&ui->ui_lock); |
280 | return &ui->vfs_inode; | |
281 | }; | |
282 | ||
dc431759 | 283 | static void ubifs_free_inode(struct inode *inode) |
fa0d7e3d | 284 | { |
fa0d7e3d | 285 | struct ubifs_inode *ui = ubifs_inode(inode); |
2c58d548 | 286 | |
0cdc17eb | 287 | kfree(ui->data); |
2c58d548 EB |
288 | fscrypt_free_inode(inode); |
289 | ||
fa0d7e3d NP |
290 | kmem_cache_free(ubifs_inode_slab, ui); |
291 | } | |
292 | ||
1e51764a AB |
293 | /* |
294 | * Note, Linux write-back code calls this without 'i_mutex'. | |
295 | */ | |
a9185b41 | 296 | static int ubifs_write_inode(struct inode *inode, struct writeback_control *wbc) |
1e51764a | 297 | { |
fbfa6c88 | 298 | int err = 0; |
1e51764a AB |
299 | struct ubifs_info *c = inode->i_sb->s_fs_info; |
300 | struct ubifs_inode *ui = ubifs_inode(inode); | |
301 | ||
6eb61d58 | 302 | ubifs_assert(c, !ui->xattr); |
1e51764a AB |
303 | if (is_bad_inode(inode)) |
304 | return 0; | |
305 | ||
306 | mutex_lock(&ui->ui_mutex); | |
307 | /* | |
308 | * Due to races between write-back forced by budgeting | |
5c57f20b | 309 | * (see 'sync_some_inodes()') and background write-back, the inode may |
1e51764a AB |
310 | * have already been synchronized, do not do this again. This might |
311 | * also happen if it was synchronized in an VFS operation, e.g. | |
312 | * 'ubifs_link()'. | |
313 | */ | |
314 | if (!ui->dirty) { | |
315 | mutex_unlock(&ui->ui_mutex); | |
316 | return 0; | |
317 | } | |
318 | ||
fbfa6c88 AB |
319 | /* |
320 | * As an optimization, do not write orphan inodes to the media just | |
321 | * because this is not needed. | |
322 | */ | |
323 | dbg_gen("inode %lu, mode %#x, nlink %u", | |
324 | inode->i_ino, (int)inode->i_mode, inode->i_nlink); | |
325 | if (inode->i_nlink) { | |
1f28681a | 326 | err = ubifs_jnl_write_inode(c, inode); |
fbfa6c88 | 327 | if (err) |
235c362b | 328 | ubifs_err(c, "can't write inode %lu, error %d", |
fbfa6c88 | 329 | inode->i_ino, err); |
e3c3efc2 AB |
330 | else |
331 | err = dbg_check_inode_size(c, inode, ui->ui_size); | |
fbfa6c88 | 332 | } |
1e51764a AB |
333 | |
334 | ui->dirty = 0; | |
335 | mutex_unlock(&ui->ui_mutex); | |
336 | ubifs_release_dirty_inode_budget(c, ui); | |
337 | return err; | |
338 | } | |
339 | ||
62de2592 EB |
340 | static int ubifs_drop_inode(struct inode *inode) |
341 | { | |
342 | int drop = generic_drop_inode(inode); | |
343 | ||
344 | if (!drop) | |
345 | drop = fscrypt_drop_inode(inode); | |
346 | ||
347 | return drop; | |
348 | } | |
349 | ||
d640e1b5 | 350 | static void ubifs_evict_inode(struct inode *inode) |
1e51764a AB |
351 | { |
352 | int err; | |
353 | struct ubifs_info *c = inode->i_sb->s_fs_info; | |
1e0f358e | 354 | struct ubifs_inode *ui = ubifs_inode(inode); |
1e51764a | 355 | |
1e0f358e | 356 | if (ui->xattr) |
1e51764a AB |
357 | /* |
358 | * Extended attribute inode deletions are fully handled in | |
359 | * 'ubifs_removexattr()'. These inodes are special and have | |
360 | * limited usage, so there is nothing to do here. | |
361 | */ | |
362 | goto out; | |
363 | ||
7d32c2bb | 364 | dbg_gen("inode %lu, mode %#x", inode->i_ino, (int)inode->i_mode); |
6eb61d58 | 365 | ubifs_assert(c, !atomic_read(&inode->i_count)); |
1e51764a | 366 | |
91b0abe3 | 367 | truncate_inode_pages_final(&inode->i_data); |
d640e1b5 AV |
368 | |
369 | if (inode->i_nlink) | |
370 | goto done; | |
371 | ||
1e51764a AB |
372 | if (is_bad_inode(inode)) |
373 | goto out; | |
374 | ||
1e0f358e | 375 | ui->ui_size = inode->i_size = 0; |
de94eb55 | 376 | err = ubifs_jnl_delete_inode(c, inode); |
1e51764a AB |
377 | if (err) |
378 | /* | |
379 | * Worst case we have a lost orphan inode wasting space, so a | |
0a883a05 | 380 | * simple error message is OK here. |
1e51764a | 381 | */ |
235c362b | 382 | ubifs_err(c, "can't delete inode %lu, error %d", |
de94eb55 AB |
383 | inode->i_ino, err); |
384 | ||
1e51764a | 385 | out: |
1e0f358e AB |
386 | if (ui->dirty) |
387 | ubifs_release_dirty_inode_budget(c, ui); | |
6d6cb0d6 AH |
388 | else { |
389 | /* We've deleted something - clean the "no space" flags */ | |
b137545c | 390 | c->bi.nospace = c->bi.nospace_rp = 0; |
6d6cb0d6 AH |
391 | smp_wmb(); |
392 | } | |
d640e1b5 | 393 | done: |
dbd5768f | 394 | clear_inode(inode); |
3d204e24 | 395 | fscrypt_put_encryption_info(inode); |
1e51764a AB |
396 | } |
397 | ||
aa385729 | 398 | static void ubifs_dirty_inode(struct inode *inode, int flags) |
1e51764a | 399 | { |
6eb61d58 | 400 | struct ubifs_info *c = inode->i_sb->s_fs_info; |
1e51764a AB |
401 | struct ubifs_inode *ui = ubifs_inode(inode); |
402 | ||
6eb61d58 | 403 | ubifs_assert(c, mutex_is_locked(&ui->ui_mutex)); |
1e51764a AB |
404 | if (!ui->dirty) { |
405 | ui->dirty = 1; | |
406 | dbg_gen("inode %lu", inode->i_ino); | |
407 | } | |
408 | } | |
409 | ||
410 | static int ubifs_statfs(struct dentry *dentry, struct kstatfs *buf) | |
411 | { | |
412 | struct ubifs_info *c = dentry->d_sb->s_fs_info; | |
413 | unsigned long long free; | |
7c7cbadf | 414 | __le32 *uuid = (__le32 *)c->uuid; |
1e51764a | 415 | |
7dad181b | 416 | free = ubifs_get_free_space(c); |
1e51764a AB |
417 | dbg_gen("free space %lld bytes (%lld blocks)", |
418 | free, free >> UBIFS_BLOCK_SHIFT); | |
419 | ||
420 | buf->f_type = UBIFS_SUPER_MAGIC; | |
421 | buf->f_bsize = UBIFS_BLOCK_SIZE; | |
422 | buf->f_blocks = c->block_cnt; | |
423 | buf->f_bfree = free >> UBIFS_BLOCK_SHIFT; | |
424 | if (free > c->report_rp_size) | |
425 | buf->f_bavail = (free - c->report_rp_size) >> UBIFS_BLOCK_SHIFT; | |
426 | else | |
427 | buf->f_bavail = 0; | |
428 | buf->f_files = 0; | |
429 | buf->f_ffree = 0; | |
430 | buf->f_namelen = UBIFS_MAX_NLEN; | |
7c7cbadf AB |
431 | buf->f_fsid.val[0] = le32_to_cpu(uuid[0]) ^ le32_to_cpu(uuid[2]); |
432 | buf->f_fsid.val[1] = le32_to_cpu(uuid[1]) ^ le32_to_cpu(uuid[3]); | |
6eb61d58 | 433 | ubifs_assert(c, buf->f_bfree <= c->block_cnt); |
1e51764a AB |
434 | return 0; |
435 | } | |
436 | ||
34c80b1d | 437 | static int ubifs_show_options(struct seq_file *s, struct dentry *root) |
1e51764a | 438 | { |
34c80b1d | 439 | struct ubifs_info *c = root->d_sb->s_fs_info; |
1e51764a AB |
440 | |
441 | if (c->mount_opts.unmount_mode == 2) | |
d4eb08ff | 442 | seq_puts(s, ",fast_unmount"); |
1e51764a | 443 | else if (c->mount_opts.unmount_mode == 1) |
d4eb08ff | 444 | seq_puts(s, ",norm_unmount"); |
1e51764a | 445 | |
4793e7c5 | 446 | if (c->mount_opts.bulk_read == 2) |
d4eb08ff | 447 | seq_puts(s, ",bulk_read"); |
4793e7c5 | 448 | else if (c->mount_opts.bulk_read == 1) |
d4eb08ff | 449 | seq_puts(s, ",no_bulk_read"); |
4793e7c5 | 450 | |
2953e73f | 451 | if (c->mount_opts.chk_data_crc == 2) |
d4eb08ff | 452 | seq_puts(s, ",chk_data_crc"); |
2953e73f | 453 | else if (c->mount_opts.chk_data_crc == 1) |
d4eb08ff | 454 | seq_puts(s, ",no_chk_data_crc"); |
2953e73f | 455 | |
553dea4d | 456 | if (c->mount_opts.override_compr) { |
fcabb347 | 457 | seq_printf(s, ",compr=%s", |
6eb61d58 | 458 | ubifs_compr_name(c, c->mount_opts.compr_type)); |
553dea4d AB |
459 | } |
460 | ||
c38c5a7f | 461 | seq_printf(s, ",assert=%s", ubifs_assert_action_name(c)); |
319c1042 RV |
462 | seq_printf(s, ",ubi=%d,vol=%d", c->vi.ubi_num, c->vi.vol_id); |
463 | ||
1e51764a AB |
464 | return 0; |
465 | } | |
466 | ||
467 | static int ubifs_sync_fs(struct super_block *sb, int wait) | |
468 | { | |
f1038300 | 469 | int i, err; |
1e51764a | 470 | struct ubifs_info *c = sb->s_fs_info; |
304d427c | 471 | |
e8ea1759 | 472 | /* |
dedb0d48 AB |
473 | * Zero @wait is just an advisory thing to help the file system shove |
474 | * lots of data into the queues, and there will be the second | |
e8ea1759 AB |
475 | * '->sync_fs()' call, with non-zero @wait. |
476 | */ | |
dedb0d48 AB |
477 | if (!wait) |
478 | return 0; | |
e8ea1759 | 479 | |
3eb14297 AH |
480 | /* |
481 | * Synchronize write buffers, because 'ubifs_run_commit()' does not | |
482 | * do this if it waits for an already running commit. | |
483 | */ | |
484 | for (i = 0; i < c->jhead_cnt; i++) { | |
485 | err = ubifs_wbuf_sync(&c->jheads[i].wbuf); | |
486 | if (err) | |
487 | return err; | |
488 | } | |
489 | ||
887ee171 AB |
490 | /* |
491 | * Strictly speaking, it is not necessary to commit the journal here, | |
492 | * synchronizing write-buffers would be enough. But committing makes | |
493 | * UBIFS free space predictions much more accurate, so we want to let | |
494 | * the user be able to get more accurate results of 'statfs()' after | |
495 | * they synchronize the file system. | |
496 | */ | |
f1038300 AB |
497 | err = ubifs_run_commit(c); |
498 | if (err) | |
499 | return err; | |
403e12ab | 500 | |
cb5c6a2b | 501 | return ubi_sync(c->vi.ubi_num); |
1e51764a AB |
502 | } |
503 | ||
504 | /** | |
505 | * init_constants_early - initialize UBIFS constants. | |
506 | * @c: UBIFS file-system description object | |
507 | * | |
508 | * This function initialize UBIFS constants which do not need the superblock to | |
509 | * be read. It also checks that the UBI volume satisfies basic UBIFS | |
510 | * requirements. Returns zero in case of success and a negative error code in | |
511 | * case of failure. | |
512 | */ | |
513 | static int init_constants_early(struct ubifs_info *c) | |
514 | { | |
515 | if (c->vi.corrupted) { | |
235c362b | 516 | ubifs_warn(c, "UBI volume is corrupted - read-only mode"); |
1e51764a AB |
517 | c->ro_media = 1; |
518 | } | |
519 | ||
520 | if (c->di.ro_mode) { | |
235c362b | 521 | ubifs_msg(c, "read-only UBI device"); |
1e51764a AB |
522 | c->ro_media = 1; |
523 | } | |
524 | ||
525 | if (c->vi.vol_type == UBI_STATIC_VOLUME) { | |
235c362b | 526 | ubifs_msg(c, "static UBI volume - read-only mode"); |
1e51764a AB |
527 | c->ro_media = 1; |
528 | } | |
529 | ||
530 | c->leb_cnt = c->vi.size; | |
531 | c->leb_size = c->vi.usable_leb_size; | |
ca2ec61d | 532 | c->leb_start = c->di.leb_start; |
1e51764a AB |
533 | c->half_leb_size = c->leb_size / 2; |
534 | c->min_io_size = c->di.min_io_size; | |
535 | c->min_io_shift = fls(c->min_io_size) - 1; | |
3e8e2e0c AB |
536 | c->max_write_size = c->di.max_write_size; |
537 | c->max_write_shift = fls(c->max_write_size) - 1; | |
1e51764a AB |
538 | |
539 | if (c->leb_size < UBIFS_MIN_LEB_SZ) { | |
dccbc919 DG |
540 | ubifs_errc(c, "too small LEBs (%d bytes), min. is %d bytes", |
541 | c->leb_size, UBIFS_MIN_LEB_SZ); | |
1e51764a AB |
542 | return -EINVAL; |
543 | } | |
544 | ||
545 | if (c->leb_cnt < UBIFS_MIN_LEB_CNT) { | |
dccbc919 DG |
546 | ubifs_errc(c, "too few LEBs (%d), min. is %d", |
547 | c->leb_cnt, UBIFS_MIN_LEB_CNT); | |
1e51764a AB |
548 | return -EINVAL; |
549 | } | |
550 | ||
551 | if (!is_power_of_2(c->min_io_size)) { | |
dccbc919 | 552 | ubifs_errc(c, "bad min. I/O size %d", c->min_io_size); |
1e51764a AB |
553 | return -EINVAL; |
554 | } | |
555 | ||
3e8e2e0c AB |
556 | /* |
557 | * Maximum write size has to be greater or equivalent to min. I/O | |
558 | * size, and be multiple of min. I/O size. | |
559 | */ | |
560 | if (c->max_write_size < c->min_io_size || | |
561 | c->max_write_size % c->min_io_size || | |
562 | !is_power_of_2(c->max_write_size)) { | |
dccbc919 DG |
563 | ubifs_errc(c, "bad write buffer size %d for %d min. I/O unit", |
564 | c->max_write_size, c->min_io_size); | |
3e8e2e0c AB |
565 | return -EINVAL; |
566 | } | |
567 | ||
1e51764a AB |
568 | /* |
569 | * UBIFS aligns all node to 8-byte boundary, so to make function in | |
570 | * io.c simpler, assume minimum I/O unit size to be 8 bytes if it is | |
571 | * less than 8. | |
572 | */ | |
573 | if (c->min_io_size < 8) { | |
574 | c->min_io_size = 8; | |
575 | c->min_io_shift = 3; | |
3e8e2e0c AB |
576 | if (c->max_write_size < c->min_io_size) { |
577 | c->max_write_size = c->min_io_size; | |
578 | c->max_write_shift = c->min_io_shift; | |
579 | } | |
1e51764a AB |
580 | } |
581 | ||
582 | c->ref_node_alsz = ALIGN(UBIFS_REF_NODE_SZ, c->min_io_size); | |
583 | c->mst_node_alsz = ALIGN(UBIFS_MST_NODE_SZ, c->min_io_size); | |
584 | ||
585 | /* | |
586 | * Initialize node length ranges which are mostly needed for node | |
587 | * length validation. | |
588 | */ | |
589 | c->ranges[UBIFS_PAD_NODE].len = UBIFS_PAD_NODE_SZ; | |
590 | c->ranges[UBIFS_SB_NODE].len = UBIFS_SB_NODE_SZ; | |
591 | c->ranges[UBIFS_MST_NODE].len = UBIFS_MST_NODE_SZ; | |
592 | c->ranges[UBIFS_REF_NODE].len = UBIFS_REF_NODE_SZ; | |
593 | c->ranges[UBIFS_TRUN_NODE].len = UBIFS_TRUN_NODE_SZ; | |
594 | c->ranges[UBIFS_CS_NODE].len = UBIFS_CS_NODE_SZ; | |
d8a22773 SH |
595 | c->ranges[UBIFS_AUTH_NODE].min_len = UBIFS_AUTH_NODE_SZ; |
596 | c->ranges[UBIFS_AUTH_NODE].max_len = UBIFS_AUTH_NODE_SZ + | |
597 | UBIFS_MAX_HMAC_LEN; | |
817aa094 SH |
598 | c->ranges[UBIFS_SIG_NODE].min_len = UBIFS_SIG_NODE_SZ; |
599 | c->ranges[UBIFS_SIG_NODE].max_len = c->leb_size - UBIFS_SB_NODE_SZ; | |
1e51764a AB |
600 | |
601 | c->ranges[UBIFS_INO_NODE].min_len = UBIFS_INO_NODE_SZ; | |
602 | c->ranges[UBIFS_INO_NODE].max_len = UBIFS_MAX_INO_NODE_SZ; | |
603 | c->ranges[UBIFS_ORPH_NODE].min_len = | |
604 | UBIFS_ORPH_NODE_SZ + sizeof(__le64); | |
605 | c->ranges[UBIFS_ORPH_NODE].max_len = c->leb_size; | |
606 | c->ranges[UBIFS_DENT_NODE].min_len = UBIFS_DENT_NODE_SZ; | |
607 | c->ranges[UBIFS_DENT_NODE].max_len = UBIFS_MAX_DENT_NODE_SZ; | |
608 | c->ranges[UBIFS_XENT_NODE].min_len = UBIFS_XENT_NODE_SZ; | |
609 | c->ranges[UBIFS_XENT_NODE].max_len = UBIFS_MAX_XENT_NODE_SZ; | |
610 | c->ranges[UBIFS_DATA_NODE].min_len = UBIFS_DATA_NODE_SZ; | |
611 | c->ranges[UBIFS_DATA_NODE].max_len = UBIFS_MAX_DATA_NODE_SZ; | |
612 | /* | |
613 | * Minimum indexing node size is amended later when superblock is | |
614 | * read and the key length is known. | |
615 | */ | |
616 | c->ranges[UBIFS_IDX_NODE].min_len = UBIFS_IDX_NODE_SZ + UBIFS_BRANCH_SZ; | |
617 | /* | |
618 | * Maximum indexing node size is amended later when superblock is | |
619 | * read and the fanout is known. | |
620 | */ | |
621 | c->ranges[UBIFS_IDX_NODE].max_len = INT_MAX; | |
622 | ||
623 | /* | |
7078202e AB |
624 | * Initialize dead and dark LEB space watermarks. See gc.c for comments |
625 | * about these values. | |
1e51764a AB |
626 | */ |
627 | c->dead_wm = ALIGN(MIN_WRITE_SZ, c->min_io_size); | |
628 | c->dark_wm = ALIGN(UBIFS_MAX_NODE_SZ, c->min_io_size); | |
629 | ||
9bbb5726 AB |
630 | /* |
631 | * Calculate how many bytes would be wasted at the end of LEB if it was | |
632 | * fully filled with data nodes of maximum size. This is used in | |
633 | * calculations when reporting free space. | |
634 | */ | |
635 | c->leb_overhead = c->leb_size % UBIFS_MAX_DATA_NODE_SZ; | |
39ce81ce | 636 | |
4793e7c5 | 637 | /* Buffer size for bulk-reads */ |
6c0c42cd AB |
638 | c->max_bu_buf_len = UBIFS_MAX_BULK_READ * UBIFS_MAX_DATA_NODE_SZ; |
639 | if (c->max_bu_buf_len > c->leb_size) | |
640 | c->max_bu_buf_len = c->leb_size; | |
377e208f RW |
641 | |
642 | /* Log is ready, preserve one LEB for commits. */ | |
643 | c->min_log_bytes = c->leb_size; | |
644 | ||
1e51764a AB |
645 | return 0; |
646 | } | |
647 | ||
648 | /** | |
649 | * bud_wbuf_callback - bud LEB write-buffer synchronization call-back. | |
650 | * @c: UBIFS file-system description object | |
651 | * @lnum: LEB the write-buffer was synchronized to | |
652 | * @free: how many free bytes left in this LEB | |
653 | * @pad: how many bytes were padded | |
654 | * | |
655 | * This is a callback function which is called by the I/O unit when the | |
656 | * write-buffer is synchronized. We need this to correctly maintain space | |
657 | * accounting in bud logical eraseblocks. This function returns zero in case of | |
658 | * success and a negative error code in case of failure. | |
659 | * | |
660 | * This function actually belongs to the journal, but we keep it here because | |
661 | * we want to keep it static. | |
662 | */ | |
663 | static int bud_wbuf_callback(struct ubifs_info *c, int lnum, int free, int pad) | |
664 | { | |
665 | return ubifs_update_one_lp(c, lnum, free, pad, 0, 0); | |
666 | } | |
667 | ||
668 | /* | |
79807d07 | 669 | * init_constants_sb - initialize UBIFS constants. |
1e51764a AB |
670 | * @c: UBIFS file-system description object |
671 | * | |
672 | * This is a helper function which initializes various UBIFS constants after | |
673 | * the superblock has been read. It also checks various UBIFS parameters and | |
674 | * makes sure they are all right. Returns zero in case of success and a | |
675 | * negative error code in case of failure. | |
676 | */ | |
79807d07 | 677 | static int init_constants_sb(struct ubifs_info *c) |
1e51764a AB |
678 | { |
679 | int tmp, err; | |
4d61db4f | 680 | long long tmp64; |
1e51764a AB |
681 | |
682 | c->main_bytes = (long long)c->main_lebs * c->leb_size; | |
683 | c->max_znode_sz = sizeof(struct ubifs_znode) + | |
684 | c->fanout * sizeof(struct ubifs_zbranch); | |
685 | ||
686 | tmp = ubifs_idx_node_sz(c, 1); | |
687 | c->ranges[UBIFS_IDX_NODE].min_len = tmp; | |
688 | c->min_idx_node_sz = ALIGN(tmp, 8); | |
689 | ||
690 | tmp = ubifs_idx_node_sz(c, c->fanout); | |
691 | c->ranges[UBIFS_IDX_NODE].max_len = tmp; | |
692 | c->max_idx_node_sz = ALIGN(tmp, 8); | |
693 | ||
694 | /* Make sure LEB size is large enough to fit full commit */ | |
695 | tmp = UBIFS_CS_NODE_SZ + UBIFS_REF_NODE_SZ * c->jhead_cnt; | |
696 | tmp = ALIGN(tmp, c->min_io_size); | |
697 | if (tmp > c->leb_size) { | |
235c362b | 698 | ubifs_err(c, "too small LEB size %d, at least %d needed", |
a6aae4dd | 699 | c->leb_size, tmp); |
1e51764a AB |
700 | return -EINVAL; |
701 | } | |
702 | ||
703 | /* | |
704 | * Make sure that the log is large enough to fit reference nodes for | |
705 | * all buds plus one reserved LEB. | |
706 | */ | |
4d61db4f AB |
707 | tmp64 = c->max_bud_bytes + c->leb_size - 1; |
708 | c->max_bud_cnt = div_u64(tmp64, c->leb_size); | |
1e51764a AB |
709 | tmp = (c->ref_node_alsz * c->max_bud_cnt + c->leb_size - 1); |
710 | tmp /= c->leb_size; | |
711 | tmp += 1; | |
712 | if (c->log_lebs < tmp) { | |
235c362b | 713 | ubifs_err(c, "too small log %d LEBs, required min. %d LEBs", |
a6aae4dd | 714 | c->log_lebs, tmp); |
1e51764a AB |
715 | return -EINVAL; |
716 | } | |
717 | ||
718 | /* | |
719 | * When budgeting we assume worst-case scenarios when the pages are not | |
720 | * be compressed and direntries are of the maximum size. | |
721 | * | |
722 | * Note, data, which may be stored in inodes is budgeted separately, so | |
b137545c | 723 | * it is not included into 'c->bi.inode_budget'. |
1e51764a | 724 | */ |
b137545c AB |
725 | c->bi.page_budget = UBIFS_MAX_DATA_NODE_SZ * UBIFS_BLOCKS_PER_PAGE; |
726 | c->bi.inode_budget = UBIFS_INO_NODE_SZ; | |
727 | c->bi.dent_budget = UBIFS_MAX_DENT_NODE_SZ; | |
1e51764a AB |
728 | |
729 | /* | |
730 | * When the amount of flash space used by buds becomes | |
731 | * 'c->max_bud_bytes', UBIFS just blocks all writers and starts commit. | |
732 | * The writers are unblocked when the commit is finished. To avoid | |
733 | * writers to be blocked UBIFS initiates background commit in advance, | |
734 | * when number of bud bytes becomes above the limit defined below. | |
735 | */ | |
736 | c->bg_bud_bytes = (c->max_bud_bytes * 13) >> 4; | |
737 | ||
738 | /* | |
739 | * Ensure minimum journal size. All the bytes in the journal heads are | |
740 | * considered to be used, when calculating the current journal usage. | |
741 | * Consequently, if the journal is too small, UBIFS will treat it as | |
742 | * always full. | |
743 | */ | |
4d61db4f | 744 | tmp64 = (long long)(c->jhead_cnt + 1) * c->leb_size + 1; |
1e51764a AB |
745 | if (c->bg_bud_bytes < tmp64) |
746 | c->bg_bud_bytes = tmp64; | |
747 | if (c->max_bud_bytes < tmp64 + c->leb_size) | |
748 | c->max_bud_bytes = tmp64 + c->leb_size; | |
749 | ||
750 | err = ubifs_calc_lpt_geom(c); | |
751 | if (err) | |
752 | return err; | |
753 | ||
fb1cd01a AB |
754 | /* Initialize effective LEB size used in budgeting calculations */ |
755 | c->idx_leb_size = c->leb_size - c->max_idx_node_sz; | |
79807d07 AB |
756 | return 0; |
757 | } | |
758 | ||
759 | /* | |
760 | * init_constants_master - initialize UBIFS constants. | |
761 | * @c: UBIFS file-system description object | |
762 | * | |
763 | * This is a helper function which initializes various UBIFS constants after | |
764 | * the master node has been read. It also checks various UBIFS parameters and | |
765 | * makes sure they are all right. | |
766 | */ | |
767 | static void init_constants_master(struct ubifs_info *c) | |
768 | { | |
769 | long long tmp64; | |
770 | ||
b137545c | 771 | c->bi.min_idx_lebs = ubifs_calc_min_idx_lebs(c); |
fb1cd01a | 772 | c->report_rp_size = ubifs_reported_space(c, c->rp_size); |
1e51764a AB |
773 | |
774 | /* | |
775 | * Calculate total amount of FS blocks. This number is not used | |
776 | * internally because it does not make much sense for UBIFS, but it is | |
777 | * necessary to report something for the 'statfs()' call. | |
778 | * | |
7dad181b | 779 | * Subtract the LEB reserved for GC, the LEB which is reserved for |
af14a1ad AB |
780 | * deletions, minimum LEBs for the index, and assume only one journal |
781 | * head is available. | |
1e51764a | 782 | */ |
af14a1ad | 783 | tmp64 = c->main_lebs - 1 - 1 - MIN_INDEX_LEBS - c->jhead_cnt + 1; |
4d61db4f | 784 | tmp64 *= (long long)c->leb_size - c->leb_overhead; |
1e51764a AB |
785 | tmp64 = ubifs_reported_space(c, tmp64); |
786 | c->block_cnt = tmp64 >> UBIFS_BLOCK_SHIFT; | |
1e51764a AB |
787 | } |
788 | ||
789 | /** | |
790 | * take_gc_lnum - reserve GC LEB. | |
791 | * @c: UBIFS file-system description object | |
792 | * | |
b4978e94 AB |
793 | * This function ensures that the LEB reserved for garbage collection is marked |
794 | * as "taken" in lprops. We also have to set free space to LEB size and dirty | |
795 | * space to zero, because lprops may contain out-of-date information if the | |
796 | * file-system was un-mounted before it has been committed. This function | |
797 | * returns zero in case of success and a negative error code in case of | |
798 | * failure. | |
1e51764a AB |
799 | */ |
800 | static int take_gc_lnum(struct ubifs_info *c) | |
801 | { | |
802 | int err; | |
803 | ||
804 | if (c->gc_lnum == -1) { | |
235c362b | 805 | ubifs_err(c, "no LEB for GC"); |
1e51764a AB |
806 | return -EINVAL; |
807 | } | |
808 | ||
1e51764a AB |
809 | /* And we have to tell lprops that this LEB is taken */ |
810 | err = ubifs_change_one_lp(c, c->gc_lnum, c->leb_size, 0, | |
811 | LPROPS_TAKEN, 0, 0); | |
812 | return err; | |
813 | } | |
814 | ||
815 | /** | |
816 | * alloc_wbufs - allocate write-buffers. | |
817 | * @c: UBIFS file-system description object | |
818 | * | |
819 | * This helper function allocates and initializes UBIFS write-buffers. Returns | |
820 | * zero in case of success and %-ENOMEM in case of failure. | |
821 | */ | |
822 | static int alloc_wbufs(struct ubifs_info *c) | |
823 | { | |
824 | int i, err; | |
825 | ||
86b4c14d FF |
826 | c->jheads = kcalloc(c->jhead_cnt, sizeof(struct ubifs_jhead), |
827 | GFP_KERNEL); | |
1e51764a AB |
828 | if (!c->jheads) |
829 | return -ENOMEM; | |
830 | ||
831 | /* Initialize journal heads */ | |
832 | for (i = 0; i < c->jhead_cnt; i++) { | |
833 | INIT_LIST_HEAD(&c->jheads[i].buds_list); | |
834 | err = ubifs_wbuf_init(c, &c->jheads[i].wbuf); | |
835 | if (err) | |
836 | return err; | |
837 | ||
838 | c->jheads[i].wbuf.sync_callback = &bud_wbuf_callback; | |
839 | c->jheads[i].wbuf.jhead = i; | |
1a0b0699 | 840 | c->jheads[i].grouped = 1; |
6a98bc46 | 841 | c->jheads[i].log_hash = ubifs_hash_get_desc(c); |
42119dbe WS |
842 | if (IS_ERR(c->jheads[i].log_hash)) { |
843 | err = PTR_ERR(c->jheads[i].log_hash); | |
6a98bc46 | 844 | goto out; |
42119dbe | 845 | } |
1e51764a AB |
846 | } |
847 | ||
1e51764a | 848 | /* |
44156267 AB |
849 | * Garbage Collector head does not need to be synchronized by timer. |
850 | * Also GC head nodes are not grouped. | |
1e51764a | 851 | */ |
0b335b9d | 852 | c->jheads[GCHD].wbuf.no_timer = 1; |
1a0b0699 | 853 | c->jheads[GCHD].grouped = 0; |
1e51764a AB |
854 | |
855 | return 0; | |
6a98bc46 SH |
856 | |
857 | out: | |
858 | while (i--) | |
859 | kfree(c->jheads[i].log_hash); | |
860 | ||
861 | return err; | |
1e51764a AB |
862 | } |
863 | ||
864 | /** | |
865 | * free_wbufs - free write-buffers. | |
866 | * @c: UBIFS file-system description object | |
867 | */ | |
868 | static void free_wbufs(struct ubifs_info *c) | |
869 | { | |
870 | int i; | |
871 | ||
872 | if (c->jheads) { | |
873 | for (i = 0; i < c->jhead_cnt; i++) { | |
874 | kfree(c->jheads[i].wbuf.buf); | |
875 | kfree(c->jheads[i].wbuf.inodes); | |
6a98bc46 | 876 | kfree(c->jheads[i].log_hash); |
1e51764a AB |
877 | } |
878 | kfree(c->jheads); | |
879 | c->jheads = NULL; | |
880 | } | |
881 | } | |
882 | ||
883 | /** | |
884 | * free_orphans - free orphans. | |
885 | * @c: UBIFS file-system description object | |
886 | */ | |
887 | static void free_orphans(struct ubifs_info *c) | |
888 | { | |
889 | struct ubifs_orphan *orph; | |
890 | ||
891 | while (c->orph_dnext) { | |
892 | orph = c->orph_dnext; | |
893 | c->orph_dnext = orph->dnext; | |
894 | list_del(&orph->list); | |
895 | kfree(orph); | |
896 | } | |
897 | ||
898 | while (!list_empty(&c->orph_list)) { | |
899 | orph = list_entry(c->orph_list.next, struct ubifs_orphan, list); | |
900 | list_del(&orph->list); | |
901 | kfree(orph); | |
235c362b | 902 | ubifs_err(c, "orphan list not empty at unmount"); |
1e51764a AB |
903 | } |
904 | ||
905 | vfree(c->orph_buf); | |
906 | c->orph_buf = NULL; | |
907 | } | |
908 | ||
909 | /** | |
910 | * free_buds - free per-bud objects. | |
911 | * @c: UBIFS file-system description object | |
912 | */ | |
913 | static void free_buds(struct ubifs_info *c) | |
914 | { | |
bb25e49f CS |
915 | struct ubifs_bud *bud, *n; |
916 | ||
917 | rbtree_postorder_for_each_entry_safe(bud, n, &c->buds, rb) | |
918 | kfree(bud); | |
1e51764a AB |
919 | } |
920 | ||
921 | /** | |
922 | * check_volume_empty - check if the UBI volume is empty. | |
923 | * @c: UBIFS file-system description object | |
924 | * | |
925 | * This function checks if the UBIFS volume is empty by looking if its LEBs are | |
926 | * mapped or not. The result of checking is stored in the @c->empty variable. | |
927 | * Returns zero in case of success and a negative error code in case of | |
928 | * failure. | |
929 | */ | |
930 | static int check_volume_empty(struct ubifs_info *c) | |
931 | { | |
932 | int lnum, err; | |
933 | ||
934 | c->empty = 1; | |
935 | for (lnum = 0; lnum < c->leb_cnt; lnum++) { | |
d3b2578f | 936 | err = ubifs_is_mapped(c, lnum); |
1e51764a AB |
937 | if (unlikely(err < 0)) |
938 | return err; | |
939 | if (err == 1) { | |
940 | c->empty = 0; | |
941 | break; | |
942 | } | |
943 | ||
944 | cond_resched(); | |
945 | } | |
946 | ||
947 | return 0; | |
948 | } | |
949 | ||
950 | /* | |
951 | * UBIFS mount options. | |
952 | * | |
953 | * Opt_fast_unmount: do not run a journal commit before un-mounting | |
954 | * Opt_norm_unmount: run a journal commit before un-mounting | |
4793e7c5 AH |
955 | * Opt_bulk_read: enable bulk-reads |
956 | * Opt_no_bulk_read: disable bulk-reads | |
2953e73f AH |
957 | * Opt_chk_data_crc: check CRCs when reading data nodes |
958 | * Opt_no_chk_data_crc: do not check CRCs when reading data nodes | |
553dea4d | 959 | * Opt_override_compr: override default compressor |
c38c5a7f | 960 | * Opt_assert: set ubifs_assert() action |
d8a22773 SH |
961 | * Opt_auth_key: The key name used for authentication |
962 | * Opt_auth_hash_name: The hash type used for authentication | |
1e51764a AB |
963 | * Opt_err: just end of array marker |
964 | */ | |
965 | enum { | |
966 | Opt_fast_unmount, | |
967 | Opt_norm_unmount, | |
4793e7c5 AH |
968 | Opt_bulk_read, |
969 | Opt_no_bulk_read, | |
2953e73f AH |
970 | Opt_chk_data_crc, |
971 | Opt_no_chk_data_crc, | |
553dea4d | 972 | Opt_override_compr, |
c38c5a7f | 973 | Opt_assert, |
d8a22773 SH |
974 | Opt_auth_key, |
975 | Opt_auth_hash_name, | |
319c1042 | 976 | Opt_ignore, |
1e51764a AB |
977 | Opt_err, |
978 | }; | |
979 | ||
a447c093 | 980 | static const match_table_t tokens = { |
1e51764a AB |
981 | {Opt_fast_unmount, "fast_unmount"}, |
982 | {Opt_norm_unmount, "norm_unmount"}, | |
4793e7c5 AH |
983 | {Opt_bulk_read, "bulk_read"}, |
984 | {Opt_no_bulk_read, "no_bulk_read"}, | |
2953e73f AH |
985 | {Opt_chk_data_crc, "chk_data_crc"}, |
986 | {Opt_no_chk_data_crc, "no_chk_data_crc"}, | |
553dea4d | 987 | {Opt_override_compr, "compr=%s"}, |
d8a22773 SH |
988 | {Opt_auth_key, "auth_key=%s"}, |
989 | {Opt_auth_hash_name, "auth_hash_name=%s"}, | |
319c1042 RV |
990 | {Opt_ignore, "ubi=%s"}, |
991 | {Opt_ignore, "vol=%s"}, | |
c38c5a7f | 992 | {Opt_assert, "assert=%s"}, |
1e51764a AB |
993 | {Opt_err, NULL}, |
994 | }; | |
995 | ||
8379ea31 AB |
996 | /** |
997 | * parse_standard_option - parse a standard mount option. | |
998 | * @option: the option to parse | |
999 | * | |
1000 | * Normally, standard mount options like "sync" are passed to file-systems as | |
1001 | * flags. However, when a "rootflags=" kernel boot parameter is used, they may | |
1002 | * be present in the options string. This function tries to deal with this | |
1003 | * situation and parse standard options. Returns 0 if the option was not | |
1004 | * recognized, and the corresponding integer flag if it was. | |
1005 | * | |
1006 | * UBIFS is only interested in the "sync" option, so do not check for anything | |
1007 | * else. | |
1008 | */ | |
1009 | static int parse_standard_option(const char *option) | |
1010 | { | |
235c362b SY |
1011 | |
1012 | pr_notice("UBIFS: parse %s\n", option); | |
8379ea31 | 1013 | if (!strcmp(option, "sync")) |
1751e8a6 | 1014 | return SB_SYNCHRONOUS; |
8379ea31 AB |
1015 | return 0; |
1016 | } | |
1017 | ||
1e51764a AB |
1018 | /** |
1019 | * ubifs_parse_options - parse mount parameters. | |
1020 | * @c: UBIFS file-system description object | |
1021 | * @options: parameters to parse | |
1022 | * @is_remount: non-zero if this is FS re-mount | |
1023 | * | |
1024 | * This function parses UBIFS mount options and returns zero in case success | |
1025 | * and a negative error code in case of failure. | |
1026 | */ | |
1027 | static int ubifs_parse_options(struct ubifs_info *c, char *options, | |
1028 | int is_remount) | |
1029 | { | |
1030 | char *p; | |
1031 | substring_t args[MAX_OPT_ARGS]; | |
1032 | ||
1033 | if (!options) | |
1034 | return 0; | |
1035 | ||
1036 | while ((p = strsep(&options, ","))) { | |
1037 | int token; | |
1038 | ||
1039 | if (!*p) | |
1040 | continue; | |
1041 | ||
1042 | token = match_token(p, tokens, args); | |
1043 | switch (token) { | |
27ad2799 AB |
1044 | /* |
1045 | * %Opt_fast_unmount and %Opt_norm_unmount options are ignored. | |
cb54ef8b | 1046 | * We accept them in order to be backward-compatible. But this |
27ad2799 AB |
1047 | * should be removed at some point. |
1048 | */ | |
1e51764a AB |
1049 | case Opt_fast_unmount: |
1050 | c->mount_opts.unmount_mode = 2; | |
1e51764a AB |
1051 | break; |
1052 | case Opt_norm_unmount: | |
1053 | c->mount_opts.unmount_mode = 1; | |
1e51764a | 1054 | break; |
4793e7c5 AH |
1055 | case Opt_bulk_read: |
1056 | c->mount_opts.bulk_read = 2; | |
1057 | c->bulk_read = 1; | |
1058 | break; | |
1059 | case Opt_no_bulk_read: | |
1060 | c->mount_opts.bulk_read = 1; | |
1061 | c->bulk_read = 0; | |
1062 | break; | |
2953e73f AH |
1063 | case Opt_chk_data_crc: |
1064 | c->mount_opts.chk_data_crc = 2; | |
1065 | c->no_chk_data_crc = 0; | |
1066 | break; | |
1067 | case Opt_no_chk_data_crc: | |
1068 | c->mount_opts.chk_data_crc = 1; | |
1069 | c->no_chk_data_crc = 1; | |
1070 | break; | |
553dea4d AB |
1071 | case Opt_override_compr: |
1072 | { | |
1073 | char *name = match_strdup(&args[0]); | |
1074 | ||
1075 | if (!name) | |
1076 | return -ENOMEM; | |
1077 | if (!strcmp(name, "none")) | |
1078 | c->mount_opts.compr_type = UBIFS_COMPR_NONE; | |
1079 | else if (!strcmp(name, "lzo")) | |
1080 | c->mount_opts.compr_type = UBIFS_COMPR_LZO; | |
1081 | else if (!strcmp(name, "zlib")) | |
1082 | c->mount_opts.compr_type = UBIFS_COMPR_ZLIB; | |
eeabb986 MD |
1083 | else if (!strcmp(name, "zstd")) |
1084 | c->mount_opts.compr_type = UBIFS_COMPR_ZSTD; | |
553dea4d | 1085 | else { |
235c362b | 1086 | ubifs_err(c, "unknown compressor \"%s\"", name); //FIXME: is c ready? |
553dea4d AB |
1087 | kfree(name); |
1088 | return -EINVAL; | |
1089 | } | |
1090 | kfree(name); | |
1091 | c->mount_opts.override_compr = 1; | |
1092 | c->default_compr = c->mount_opts.compr_type; | |
1093 | break; | |
1094 | } | |
c38c5a7f RW |
1095 | case Opt_assert: |
1096 | { | |
1097 | char *act = match_strdup(&args[0]); | |
1098 | ||
1099 | if (!act) | |
1100 | return -ENOMEM; | |
1101 | if (!strcmp(act, "report")) | |
1102 | c->assert_action = ASSACT_REPORT; | |
1103 | else if (!strcmp(act, "read-only")) | |
1104 | c->assert_action = ASSACT_RO; | |
1105 | else if (!strcmp(act, "panic")) | |
1106 | c->assert_action = ASSACT_PANIC; | |
1107 | else { | |
1108 | ubifs_err(c, "unknown assert action \"%s\"", act); | |
1109 | kfree(act); | |
1110 | return -EINVAL; | |
1111 | } | |
1112 | kfree(act); | |
1113 | break; | |
1114 | } | |
d8a22773 | 1115 | case Opt_auth_key: |
bb674a4d ZC |
1116 | if (!is_remount) { |
1117 | c->auth_key_name = kstrdup(args[0].from, | |
1118 | GFP_KERNEL); | |
1119 | if (!c->auth_key_name) | |
1120 | return -ENOMEM; | |
1121 | } | |
d8a22773 SH |
1122 | break; |
1123 | case Opt_auth_hash_name: | |
bb674a4d ZC |
1124 | if (!is_remount) { |
1125 | c->auth_hash_name = kstrdup(args[0].from, | |
1126 | GFP_KERNEL); | |
1127 | if (!c->auth_hash_name) | |
1128 | return -ENOMEM; | |
1129 | } | |
d8a22773 | 1130 | break; |
319c1042 RV |
1131 | case Opt_ignore: |
1132 | break; | |
1e51764a | 1133 | default: |
8379ea31 AB |
1134 | { |
1135 | unsigned long flag; | |
1136 | struct super_block *sb = c->vfs_sb; | |
1137 | ||
1138 | flag = parse_standard_option(p); | |
1139 | if (!flag) { | |
235c362b | 1140 | ubifs_err(c, "unrecognized mount option \"%s\" or missing value", |
79fda517 | 1141 | p); |
8379ea31 AB |
1142 | return -EINVAL; |
1143 | } | |
1144 | sb->s_flags |= flag; | |
1145 | break; | |
1146 | } | |
1e51764a AB |
1147 | } |
1148 | } | |
1149 | ||
1150 | return 0; | |
1151 | } | |
1152 | ||
47f6d9ce ZC |
1153 | /* |
1154 | * ubifs_release_options - release mount parameters which have been dumped. | |
1155 | * @c: UBIFS file-system description object | |
1156 | */ | |
1157 | static void ubifs_release_options(struct ubifs_info *c) | |
1158 | { | |
1159 | kfree(c->auth_key_name); | |
1160 | c->auth_key_name = NULL; | |
1161 | kfree(c->auth_hash_name); | |
1162 | c->auth_hash_name = NULL; | |
1163 | } | |
1164 | ||
1e51764a AB |
1165 | /** |
1166 | * destroy_journal - destroy journal data structures. | |
1167 | * @c: UBIFS file-system description object | |
1168 | * | |
1169 | * This function destroys journal data structures including those that may have | |
1170 | * been created by recovery functions. | |
1171 | */ | |
1172 | static void destroy_journal(struct ubifs_info *c) | |
1173 | { | |
1174 | while (!list_empty(&c->unclean_leb_list)) { | |
1175 | struct ubifs_unclean_leb *ucleb; | |
1176 | ||
1177 | ucleb = list_entry(c->unclean_leb_list.next, | |
1178 | struct ubifs_unclean_leb, list); | |
1179 | list_del(&ucleb->list); | |
1180 | kfree(ucleb); | |
1181 | } | |
1182 | while (!list_empty(&c->old_buds)) { | |
1183 | struct ubifs_bud *bud; | |
1184 | ||
1185 | bud = list_entry(c->old_buds.next, struct ubifs_bud, list); | |
1186 | list_del(&bud->list); | |
1187 | kfree(bud); | |
1188 | } | |
1189 | ubifs_destroy_idx_gc(c); | |
1190 | ubifs_destroy_size_tree(c); | |
1191 | ubifs_tnc_close(c); | |
1192 | free_buds(c); | |
1193 | } | |
1194 | ||
3477d204 AB |
1195 | /** |
1196 | * bu_init - initialize bulk-read information. | |
1197 | * @c: UBIFS file-system description object | |
1198 | */ | |
1199 | static void bu_init(struct ubifs_info *c) | |
1200 | { | |
6eb61d58 | 1201 | ubifs_assert(c, c->bulk_read == 1); |
3477d204 AB |
1202 | |
1203 | if (c->bu.buf) | |
1204 | return; /* Already initialized */ | |
1205 | ||
1206 | again: | |
1207 | c->bu.buf = kmalloc(c->max_bu_buf_len, GFP_KERNEL | __GFP_NOWARN); | |
1208 | if (!c->bu.buf) { | |
1209 | if (c->max_bu_buf_len > UBIFS_KMALLOC_OK) { | |
1210 | c->max_bu_buf_len = UBIFS_KMALLOC_OK; | |
1211 | goto again; | |
1212 | } | |
1213 | ||
1214 | /* Just disable bulk-read */ | |
235c362b | 1215 | ubifs_warn(c, "cannot allocate %d bytes of memory for bulk-read, disabling it", |
79fda517 | 1216 | c->max_bu_buf_len); |
3477d204 AB |
1217 | c->mount_opts.bulk_read = 1; |
1218 | c->bulk_read = 0; | |
1219 | return; | |
1220 | } | |
1221 | } | |
1222 | ||
57a450e9 AB |
1223 | /** |
1224 | * check_free_space - check if there is enough free space to mount. | |
1225 | * @c: UBIFS file-system description object | |
1226 | * | |
1227 | * This function makes sure UBIFS has enough free space to be mounted in | |
1228 | * read/write mode. UBIFS must always have some free space to allow deletions. | |
1229 | */ | |
1230 | static int check_free_space(struct ubifs_info *c) | |
1231 | { | |
6eb61d58 | 1232 | ubifs_assert(c, c->dark_wm > 0); |
57a450e9 | 1233 | if (c->lst.total_free + c->lst.total_dirty < c->dark_wm) { |
235c362b | 1234 | ubifs_err(c, "insufficient free space to mount in R/W mode"); |
edf6be24 AB |
1235 | ubifs_dump_budg(c, &c->bi); |
1236 | ubifs_dump_lprops(c); | |
a2b9df3f | 1237 | return -ENOSPC; |
57a450e9 AB |
1238 | } |
1239 | return 0; | |
1240 | } | |
1241 | ||
1e51764a AB |
1242 | /** |
1243 | * mount_ubifs - mount UBIFS file-system. | |
1244 | * @c: UBIFS file-system description object | |
1245 | * | |
1246 | * This function mounts UBIFS file system. Returns zero in case of success and | |
1247 | * a negative error code in case of failure. | |
1e51764a AB |
1248 | */ |
1249 | static int mount_ubifs(struct ubifs_info *c) | |
1250 | { | |
2ef13294 | 1251 | int err; |
3668b70f | 1252 | long long x, y; |
1e51764a AB |
1253 | size_t sz; |
1254 | ||
bc98a42c | 1255 | c->ro_mount = !!sb_rdonly(c->vfs_sb); |
1751e8a6 LT |
1256 | /* Suppress error messages while probing if SB_SILENT is set */ |
1257 | c->probing = !!(c->vfs_sb->s_flags & SB_SILENT); | |
90bea5a3 | 1258 | |
1e51764a AB |
1259 | err = init_constants_early(c); |
1260 | if (err) | |
1261 | return err; | |
1262 | ||
17c2f9f8 AB |
1263 | err = ubifs_debugging_init(c); |
1264 | if (err) | |
1265 | return err; | |
1e51764a | 1266 | |
2e3cbf42 SS |
1267 | err = ubifs_sysfs_register(c); |
1268 | if (err) | |
1269 | goto out_debugging; | |
1270 | ||
1e51764a AB |
1271 | err = check_volume_empty(c); |
1272 | if (err) | |
1273 | goto out_free; | |
1274 | ||
2ef13294 | 1275 | if (c->empty && (c->ro_mount || c->ro_media)) { |
1e51764a AB |
1276 | /* |
1277 | * This UBI volume is empty, and read-only, or the file system | |
1278 | * is mounted read-only - we cannot format it. | |
1279 | */ | |
235c362b | 1280 | ubifs_err(c, "can't format empty UBI volume: read-only %s", |
1e51764a AB |
1281 | c->ro_media ? "UBI volume" : "mount"); |
1282 | err = -EROFS; | |
1283 | goto out_free; | |
1284 | } | |
1285 | ||
2ef13294 | 1286 | if (c->ro_media && !c->ro_mount) { |
235c362b | 1287 | ubifs_err(c, "cannot mount read-write - read-only media"); |
1e51764a AB |
1288 | err = -EROFS; |
1289 | goto out_free; | |
1290 | } | |
1291 | ||
1292 | /* | |
1293 | * The requirement for the buffer is that it should fit indexing B-tree | |
1294 | * height amount of integers. We assume the height if the TNC tree will | |
1295 | * never exceed 64. | |
1296 | */ | |
1297 | err = -ENOMEM; | |
6da2ec56 KC |
1298 | c->bottom_up_buf = kmalloc_array(BOTTOM_UP_HEIGHT, sizeof(int), |
1299 | GFP_KERNEL); | |
1e51764a AB |
1300 | if (!c->bottom_up_buf) |
1301 | goto out_free; | |
1302 | ||
1303 | c->sbuf = vmalloc(c->leb_size); | |
1304 | if (!c->sbuf) | |
1305 | goto out_free; | |
1306 | ||
2ef13294 | 1307 | if (!c->ro_mount) { |
1e51764a AB |
1308 | c->ileb_buf = vmalloc(c->leb_size); |
1309 | if (!c->ileb_buf) | |
1310 | goto out_free; | |
1311 | } | |
1312 | ||
3477d204 AB |
1313 | if (c->bulk_read == 1) |
1314 | bu_init(c); | |
1315 | ||
d882962f | 1316 | if (!c->ro_mount) { |
7799953b RW |
1317 | c->write_reserve_buf = kmalloc(COMPRESSED_DATA_NODE_BUF_SZ + \ |
1318 | UBIFS_CIPHER_BLOCK_SIZE, | |
d882962f MC |
1319 | GFP_KERNEL); |
1320 | if (!c->write_reserve_buf) | |
1321 | goto out_free; | |
1322 | } | |
1323 | ||
18d1d7fb | 1324 | c->mounting = 1; |
2953e73f | 1325 | |
d8a22773 SH |
1326 | if (c->auth_key_name) { |
1327 | if (IS_ENABLED(CONFIG_UBIFS_FS_AUTHENTICATION)) { | |
1328 | err = ubifs_init_authentication(c); | |
1329 | if (err) | |
1330 | goto out_free; | |
1331 | } else { | |
1332 | ubifs_err(c, "auth_key_name, but UBIFS is built without" | |
1333 | " authentication support"); | |
1334 | err = -EINVAL; | |
1335 | goto out_free; | |
1336 | } | |
1337 | } | |
1338 | ||
1e51764a AB |
1339 | err = ubifs_read_superblock(c); |
1340 | if (err) | |
e2a05cc7 | 1341 | goto out_auth; |
1e51764a | 1342 | |
90bea5a3 DG |
1343 | c->probing = 0; |
1344 | ||
1e51764a | 1345 | /* |
553dea4d | 1346 | * Make sure the compressor which is set as default in the superblock |
57a450e9 | 1347 | * or overridden by mount options is actually compiled in. |
1e51764a | 1348 | */ |
6eb61d58 | 1349 | if (!ubifs_compr_present(c, c->default_compr)) { |
235c362b | 1350 | ubifs_err(c, "'compressor \"%s\" is not compiled in", |
6eb61d58 | 1351 | ubifs_compr_name(c, c->default_compr)); |
8eec2f36 | 1352 | err = -ENOTSUPP; |
e2a05cc7 | 1353 | goto out_auth; |
1e51764a AB |
1354 | } |
1355 | ||
79807d07 | 1356 | err = init_constants_sb(c); |
1e51764a | 1357 | if (err) |
e2a05cc7 | 1358 | goto out_auth; |
1e51764a | 1359 | |
d5cf9473 | 1360 | sz = ALIGN(c->max_idx_node_sz, c->min_io_size) * 2; |
1e51764a AB |
1361 | c->cbuf = kmalloc(sz, GFP_NOFS); |
1362 | if (!c->cbuf) { | |
1363 | err = -ENOMEM; | |
e2a05cc7 | 1364 | goto out_auth; |
1e51764a AB |
1365 | } |
1366 | ||
b50b9f40 AB |
1367 | err = alloc_wbufs(c); |
1368 | if (err) | |
1369 | goto out_cbuf; | |
1370 | ||
0855f310 | 1371 | sprintf(c->bgt_name, BGT_NAME_PATTERN, c->vi.ubi_num, c->vi.vol_id); |
2ef13294 | 1372 | if (!c->ro_mount) { |
1e51764a | 1373 | /* Create background thread */ |
d98c6c35 | 1374 | c->bgt = kthread_run(ubifs_bg_thread, c, "%s", c->bgt_name); |
1e51764a AB |
1375 | if (IS_ERR(c->bgt)) { |
1376 | err = PTR_ERR(c->bgt); | |
1377 | c->bgt = NULL; | |
235c362b | 1378 | ubifs_err(c, "cannot spawn \"%s\", error %d", |
1e51764a AB |
1379 | c->bgt_name, err); |
1380 | goto out_wbufs; | |
1381 | } | |
1e51764a AB |
1382 | } |
1383 | ||
1384 | err = ubifs_read_master(c); | |
1385 | if (err) | |
1386 | goto out_master; | |
1387 | ||
09801194 BG |
1388 | init_constants_master(c); |
1389 | ||
1e51764a | 1390 | if ((c->mst_node->flags & cpu_to_le32(UBIFS_MST_DIRTY)) != 0) { |
235c362b | 1391 | ubifs_msg(c, "recovery needed"); |
1e51764a | 1392 | c->need_recovery = 1; |
781c5717 BG |
1393 | } |
1394 | ||
781c5717 BG |
1395 | if (c->need_recovery && !c->ro_mount) { |
1396 | err = ubifs_recover_inl_heads(c, c->sbuf); | |
1397 | if (err) | |
1398 | goto out_master; | |
1399 | } | |
1400 | ||
1401 | err = ubifs_lpt_init(c, 1, !c->ro_mount); | |
1402 | if (err) | |
1403 | goto out_master; | |
1404 | ||
09801194 BG |
1405 | if (!c->ro_mount && c->space_fixup) { |
1406 | err = ubifs_fixup_free_space(c); | |
1407 | if (err) | |
56b04e3e | 1408 | goto out_lpt; |
09801194 BG |
1409 | } |
1410 | ||
2c84599c | 1411 | if (!c->ro_mount && !c->need_recovery) { |
1e51764a AB |
1412 | /* |
1413 | * Set the "dirty" flag so that if we reboot uncleanly we | |
1414 | * will notice this immediately on the next mount. | |
1415 | */ | |
1416 | c->mst_node->flags |= cpu_to_le32(UBIFS_MST_DIRTY); | |
1417 | err = ubifs_write_master(c); | |
1418 | if (err) | |
781c5717 | 1419 | goto out_lpt; |
1e51764a AB |
1420 | } |
1421 | ||
817aa094 SH |
1422 | /* |
1423 | * Handle offline signed images: Now that the master node is | |
1424 | * written and its validation no longer depends on the hash | |
1425 | * in the superblock, we can update the offline signed | |
1426 | * superblock with a HMAC version, | |
1427 | */ | |
1428 | if (ubifs_authenticated(c) && ubifs_hmac_zero(c, c->sup_node->hmac)) { | |
1429 | err = ubifs_hmac_wkm(c, c->sup_node->hmac_wkm); | |
1430 | if (err) | |
1431 | goto out_lpt; | |
1432 | c->superblock_need_write = 1; | |
1433 | } | |
1434 | ||
1435 | if (!c->ro_mount && c->superblock_need_write) { | |
1436 | err = ubifs_write_sb_node(c, c->sup_node); | |
1437 | if (err) | |
1438 | goto out_lpt; | |
1439 | c->superblock_need_write = 0; | |
1440 | } | |
1441 | ||
b137545c | 1442 | err = dbg_check_idx_size(c, c->bi.old_idx_sz); |
1e51764a AB |
1443 | if (err) |
1444 | goto out_lpt; | |
1445 | ||
1446 | err = ubifs_replay_journal(c); | |
1447 | if (err) | |
1448 | goto out_journal; | |
1449 | ||
1fb8bd01 | 1450 | /* Calculate 'min_idx_lebs' after journal replay */ |
b137545c | 1451 | c->bi.min_idx_lebs = ubifs_calc_min_idx_lebs(c); |
1fb8bd01 | 1452 | |
2ef13294 | 1453 | err = ubifs_mount_orphans(c, c->need_recovery, c->ro_mount); |
1e51764a AB |
1454 | if (err) |
1455 | goto out_orphans; | |
1456 | ||
2ef13294 | 1457 | if (!c->ro_mount) { |
1e51764a AB |
1458 | int lnum; |
1459 | ||
57a450e9 AB |
1460 | err = check_free_space(c); |
1461 | if (err) | |
1e51764a | 1462 | goto out_orphans; |
1e51764a AB |
1463 | |
1464 | /* Check for enough log space */ | |
1465 | lnum = c->lhead_lnum + 1; | |
1466 | if (lnum >= UBIFS_LOG_LNUM + c->log_lebs) | |
1467 | lnum = UBIFS_LOG_LNUM; | |
1468 | if (lnum == c->ltail_lnum) { | |
1469 | err = ubifs_consolidate_log(c); | |
1470 | if (err) | |
1471 | goto out_orphans; | |
1472 | } | |
1473 | ||
1474 | if (c->need_recovery) { | |
1e76592f SH |
1475 | if (!ubifs_authenticated(c)) { |
1476 | err = ubifs_recover_size(c, true); | |
1477 | if (err) | |
1478 | goto out_orphans; | |
1479 | } | |
1480 | ||
1e51764a | 1481 | err = ubifs_rcvry_gc_commit(c); |
276de5d2 AB |
1482 | if (err) |
1483 | goto out_orphans; | |
1e76592f SH |
1484 | |
1485 | if (ubifs_authenticated(c)) { | |
1486 | err = ubifs_recover_size(c, false); | |
1487 | if (err) | |
1488 | goto out_orphans; | |
1489 | } | |
b4978e94 | 1490 | } else { |
1e51764a | 1491 | err = take_gc_lnum(c); |
b4978e94 AB |
1492 | if (err) |
1493 | goto out_orphans; | |
1494 | ||
1495 | /* | |
1496 | * GC LEB may contain garbage if there was an unclean | |
1497 | * reboot, and it should be un-mapped. | |
1498 | */ | |
1499 | err = ubifs_leb_unmap(c, c->gc_lnum); | |
1500 | if (err) | |
c18de72f | 1501 | goto out_orphans; |
b4978e94 | 1502 | } |
1e51764a AB |
1503 | |
1504 | err = dbg_check_lprops(c); | |
1505 | if (err) | |
1506 | goto out_orphans; | |
1507 | } else if (c->need_recovery) { | |
1e76592f | 1508 | err = ubifs_recover_size(c, false); |
1e51764a AB |
1509 | if (err) |
1510 | goto out_orphans; | |
b4978e94 AB |
1511 | } else { |
1512 | /* | |
1513 | * Even if we mount read-only, we have to set space in GC LEB | |
1514 | * to proper value because this affects UBIFS free space | |
1515 | * reporting. We do not want to have a situation when | |
1516 | * re-mounting from R/O to R/W changes amount of free space. | |
1517 | */ | |
1518 | err = take_gc_lnum(c); | |
1519 | if (err) | |
1520 | goto out_orphans; | |
1e51764a AB |
1521 | } |
1522 | ||
1523 | spin_lock(&ubifs_infos_lock); | |
1524 | list_add_tail(&c->infos_list, &ubifs_infos); | |
1525 | spin_unlock(&ubifs_infos_lock); | |
1526 | ||
1527 | if (c->need_recovery) { | |
2ef13294 | 1528 | if (c->ro_mount) |
235c362b | 1529 | ubifs_msg(c, "recovery deferred"); |
1e51764a AB |
1530 | else { |
1531 | c->need_recovery = 0; | |
235c362b | 1532 | ubifs_msg(c, "recovery completed"); |
b221337a AB |
1533 | /* |
1534 | * GC LEB has to be empty and taken at this point. But | |
1535 | * the journal head LEBs may also be accounted as | |
1536 | * "empty taken" if they are empty. | |
1537 | */ | |
6eb61d58 | 1538 | ubifs_assert(c, c->lst.taken_empty_lebs > 0); |
1e51764a | 1539 | } |
6ba87c9b | 1540 | } else |
6eb61d58 | 1541 | ubifs_assert(c, c->lst.taken_empty_lebs > 0); |
1e51764a | 1542 | |
6ba87c9b | 1543 | err = dbg_check_filesystem(c); |
552ff317 AB |
1544 | if (err) |
1545 | goto out_infos; | |
1546 | ||
702d6a83 | 1547 | dbg_debugfs_init_fs(c); |
1e51764a | 1548 | |
18d1d7fb | 1549 | c->mounting = 0; |
2953e73f | 1550 | |
235c362b | 1551 | ubifs_msg(c, "UBIFS: mounted UBI device %d, volume %d, name \"%s\"%s", |
3668b70f | 1552 | c->vi.ubi_num, c->vi.vol_id, c->vi.name, |
beadadfa | 1553 | c->ro_mount ? ", R/O mode" : ""); |
1e51764a | 1554 | x = (long long)c->main_lebs * c->leb_size; |
3668b70f | 1555 | y = (long long)c->log_lebs * c->leb_size + c->max_bud_bytes; |
235c362b | 1556 | ubifs_msg(c, "LEB size: %d bytes (%d KiB), min./max. I/O unit sizes: %d bytes/%d bytes", |
3668b70f AB |
1557 | c->leb_size, c->leb_size >> 10, c->min_io_size, |
1558 | c->max_write_size); | |
829ad58a MD |
1559 | ubifs_msg(c, "FS size: %lld bytes (%lld MiB, %d LEBs), max %d LEBs, journal size %lld bytes (%lld MiB, %d LEBs)", |
1560 | x, x >> 20, c->main_lebs, c->max_leb_cnt, | |
3668b70f | 1561 | y, y >> 20, c->log_lebs + c->max_bud_cnt); |
235c362b | 1562 | ubifs_msg(c, "reserved for root: %llu bytes (%llu KiB)", |
3668b70f | 1563 | c->report_rp_size, c->report_rp_size >> 10); |
235c362b | 1564 | ubifs_msg(c, "media format: w%d/r%d (latest is w%d/r%d), UUID %pUB%s", |
963f0cf6 | 1565 | c->fmt_version, c->ro_compat_version, |
3668b70f AB |
1566 | UBIFS_FORMAT_VERSION, UBIFS_RO_COMPAT_VERSION, c->uuid, |
1567 | c->big_lpt ? ", big LPT model" : ", small LPT model"); | |
1568 | ||
6eb61d58 | 1569 | dbg_gen("default compressor: %s", ubifs_compr_name(c, c->default_compr)); |
3668b70f | 1570 | dbg_gen("data journal heads: %d", |
1e51764a | 1571 | c->jhead_cnt - NONDATA_JHEADS_CNT); |
3668b70f | 1572 | dbg_gen("log LEBs: %d (%d - %d)", |
1e51764a | 1573 | c->log_lebs, UBIFS_LOG_LNUM, c->log_last); |
3668b70f | 1574 | dbg_gen("LPT area LEBs: %d (%d - %d)", |
1e51764a | 1575 | c->lpt_lebs, c->lpt_first, c->lpt_last); |
3668b70f | 1576 | dbg_gen("orphan area LEBs: %d (%d - %d)", |
1e51764a | 1577 | c->orph_lebs, c->orph_first, c->orph_last); |
3668b70f | 1578 | dbg_gen("main area LEBs: %d (%d - %d)", |
1e51764a | 1579 | c->main_lebs, c->main_first, c->leb_cnt - 1); |
3668b70f | 1580 | dbg_gen("index LEBs: %d", c->lst.idx_lebs); |
89f40d0a | 1581 | dbg_gen("total index bytes: %llu (%llu KiB, %llu MiB)", |
b137545c AB |
1582 | c->bi.old_idx_sz, c->bi.old_idx_sz >> 10, |
1583 | c->bi.old_idx_sz >> 20); | |
3668b70f AB |
1584 | dbg_gen("key hash type: %d", c->key_hash_type); |
1585 | dbg_gen("tree fanout: %d", c->fanout); | |
1586 | dbg_gen("reserved GC LEB: %d", c->gc_lnum); | |
1587 | dbg_gen("max. znode size %d", c->max_znode_sz); | |
1588 | dbg_gen("max. index node size %d", c->max_idx_node_sz); | |
1589 | dbg_gen("node sizes: data %zu, inode %zu, dentry %zu", | |
8e5033ad | 1590 | UBIFS_DATA_NODE_SZ, UBIFS_INO_NODE_SZ, UBIFS_DENT_NODE_SZ); |
3668b70f | 1591 | dbg_gen("node sizes: trun %zu, sb %zu, master %zu", |
8e5033ad | 1592 | UBIFS_TRUN_NODE_SZ, UBIFS_SB_NODE_SZ, UBIFS_MST_NODE_SZ); |
3668b70f | 1593 | dbg_gen("node sizes: ref %zu, cmt. start %zu, orph %zu", |
8e5033ad | 1594 | UBIFS_REF_NODE_SZ, UBIFS_CS_NODE_SZ, UBIFS_ORPH_NODE_SZ); |
3668b70f | 1595 | dbg_gen("max. node sizes: data %zu, inode %zu dentry %zu, idx %d", |
c4361570 | 1596 | UBIFS_MAX_DATA_NODE_SZ, UBIFS_MAX_INO_NODE_SZ, |
6342aaeb | 1597 | UBIFS_MAX_DENT_NODE_SZ, ubifs_idx_node_sz(c, c->fanout)); |
3668b70f AB |
1598 | dbg_gen("dead watermark: %d", c->dead_wm); |
1599 | dbg_gen("dark watermark: %d", c->dark_wm); | |
1600 | dbg_gen("LEB overhead: %d", c->leb_overhead); | |
1e51764a | 1601 | x = (long long)c->main_lebs * c->dark_wm; |
3668b70f | 1602 | dbg_gen("max. dark space: %lld (%lld KiB, %lld MiB)", |
1e51764a | 1603 | x, x >> 10, x >> 20); |
3668b70f | 1604 | dbg_gen("maximum bud bytes: %lld (%lld KiB, %lld MiB)", |
1e51764a AB |
1605 | c->max_bud_bytes, c->max_bud_bytes >> 10, |
1606 | c->max_bud_bytes >> 20); | |
3668b70f | 1607 | dbg_gen("BG commit bud bytes: %lld (%lld KiB, %lld MiB)", |
1e51764a AB |
1608 | c->bg_bud_bytes, c->bg_bud_bytes >> 10, |
1609 | c->bg_bud_bytes >> 20); | |
3668b70f | 1610 | dbg_gen("current bud bytes %lld (%lld KiB, %lld MiB)", |
1e51764a | 1611 | c->bud_bytes, c->bud_bytes >> 10, c->bud_bytes >> 20); |
3668b70f AB |
1612 | dbg_gen("max. seq. number: %llu", c->max_sqnum); |
1613 | dbg_gen("commit number: %llu", c->cmt_no); | |
9ca2d732 RW |
1614 | dbg_gen("max. xattrs per inode: %d", ubifs_xattr_max_cnt(c)); |
1615 | dbg_gen("max orphans: %d", c->max_orphans); | |
1e51764a AB |
1616 | |
1617 | return 0; | |
1618 | ||
1619 | out_infos: | |
1620 | spin_lock(&ubifs_infos_lock); | |
1621 | list_del(&c->infos_list); | |
1622 | spin_unlock(&ubifs_infos_lock); | |
1623 | out_orphans: | |
1624 | free_orphans(c); | |
1625 | out_journal: | |
1626 | destroy_journal(c); | |
1627 | out_lpt: | |
1628 | ubifs_lpt_free(c, 0); | |
1629 | out_master: | |
1630 | kfree(c->mst_node); | |
1631 | kfree(c->rcvrd_mst_node); | |
1632 | if (c->bgt) | |
1633 | kthread_stop(c->bgt); | |
1634 | out_wbufs: | |
1635 | free_wbufs(c); | |
1636 | out_cbuf: | |
1637 | kfree(c->cbuf); | |
e2a05cc7 ZC |
1638 | out_auth: |
1639 | ubifs_exit_authentication(c); | |
1e51764a | 1640 | out_free: |
d882962f | 1641 | kfree(c->write_reserve_buf); |
3477d204 | 1642 | kfree(c->bu.buf); |
1e51764a AB |
1643 | vfree(c->ileb_buf); |
1644 | vfree(c->sbuf); | |
1645 | kfree(c->bottom_up_buf); | |
ff90bdfb | 1646 | kfree(c->sup_node); |
2e3cbf42 SS |
1647 | ubifs_sysfs_unregister(c); |
1648 | out_debugging: | |
17c2f9f8 | 1649 | ubifs_debugging_exit(c); |
1e51764a AB |
1650 | return err; |
1651 | } | |
1652 | ||
1653 | /** | |
1654 | * ubifs_umount - un-mount UBIFS file-system. | |
1655 | * @c: UBIFS file-system description object | |
1656 | * | |
1657 | * Note, this function is called to free allocated resourced when un-mounting, | |
1658 | * as well as free resources when an error occurred while we were half way | |
1659 | * through mounting (error path cleanup function). So it has to make sure the | |
1660 | * resource was actually allocated before freeing it. | |
1661 | */ | |
1662 | static void ubifs_umount(struct ubifs_info *c) | |
1663 | { | |
1664 | dbg_gen("un-mounting UBI device %d, volume %d", c->vi.ubi_num, | |
1665 | c->vi.vol_id); | |
1666 | ||
552ff317 | 1667 | dbg_debugfs_exit_fs(c); |
1e51764a AB |
1668 | spin_lock(&ubifs_infos_lock); |
1669 | list_del(&c->infos_list); | |
1670 | spin_unlock(&ubifs_infos_lock); | |
1671 | ||
1672 | if (c->bgt) | |
1673 | kthread_stop(c->bgt); | |
1674 | ||
1675 | destroy_journal(c); | |
1676 | free_wbufs(c); | |
1677 | free_orphans(c); | |
1678 | ubifs_lpt_free(c, 0); | |
d8a22773 | 1679 | ubifs_exit_authentication(c); |
1e51764a | 1680 | |
47f6d9ce | 1681 | ubifs_release_options(c); |
1e51764a AB |
1682 | kfree(c->cbuf); |
1683 | kfree(c->rcvrd_mst_node); | |
1684 | kfree(c->mst_node); | |
d882962f | 1685 | kfree(c->write_reserve_buf); |
3477d204 AB |
1686 | kfree(c->bu.buf); |
1687 | vfree(c->ileb_buf); | |
1e51764a AB |
1688 | vfree(c->sbuf); |
1689 | kfree(c->bottom_up_buf); | |
ff90bdfb | 1690 | kfree(c->sup_node); |
17c2f9f8 | 1691 | ubifs_debugging_exit(c); |
2e3cbf42 | 1692 | ubifs_sysfs_unregister(c); |
1e51764a AB |
1693 | } |
1694 | ||
1695 | /** | |
1696 | * ubifs_remount_rw - re-mount in read-write mode. | |
1697 | * @c: UBIFS file-system description object | |
1698 | * | |
1699 | * UBIFS avoids allocating many unnecessary resources when mounted in read-only | |
1700 | * mode. This function allocates the needed resources and re-mounts UBIFS in | |
1701 | * read-write mode. | |
1702 | */ | |
1703 | static int ubifs_remount_rw(struct ubifs_info *c) | |
1704 | { | |
1705 | int err, lnum; | |
1706 | ||
963f0cf6 | 1707 | if (c->rw_incompat) { |
235c362b SY |
1708 | ubifs_err(c, "the file-system is not R/W-compatible"); |
1709 | ubifs_msg(c, "on-flash format version is w%d/r%d, but software only supports up to version w%d/r%d", | |
79fda517 AB |
1710 | c->fmt_version, c->ro_compat_version, |
1711 | UBIFS_FORMAT_VERSION, UBIFS_RO_COMPAT_VERSION); | |
963f0cf6 AB |
1712 | return -EROFS; |
1713 | } | |
1714 | ||
1e51764a | 1715 | mutex_lock(&c->umount_mutex); |
84abf972 | 1716 | dbg_save_space_info(c); |
1e51764a | 1717 | c->remounting_rw = 1; |
c88ac00c | 1718 | c->ro_mount = 0; |
1e51764a | 1719 | |
67e753ca AB |
1720 | if (c->space_fixup) { |
1721 | err = ubifs_fixup_free_space(c); | |
1722 | if (err) | |
fcdd57c8 | 1723 | goto out; |
67e753ca AB |
1724 | } |
1725 | ||
57a450e9 AB |
1726 | err = check_free_space(c); |
1727 | if (err) | |
1e51764a | 1728 | goto out; |
1e51764a | 1729 | |
1e51764a | 1730 | if (c->need_recovery) { |
235c362b | 1731 | ubifs_msg(c, "completing deferred recovery"); |
1e51764a AB |
1732 | err = ubifs_write_rcvrd_mst_node(c); |
1733 | if (err) | |
1734 | goto out; | |
1e76592f SH |
1735 | if (!ubifs_authenticated(c)) { |
1736 | err = ubifs_recover_size(c, true); | |
1737 | if (err) | |
1738 | goto out; | |
1739 | } | |
1e51764a AB |
1740 | err = ubifs_clean_lebs(c, c->sbuf); |
1741 | if (err) | |
1742 | goto out; | |
1743 | err = ubifs_recover_inl_heads(c, c->sbuf); | |
1744 | if (err) | |
1745 | goto out; | |
49d128aa AH |
1746 | } else { |
1747 | /* A readonly mount is not allowed to have orphans */ | |
6eb61d58 | 1748 | ubifs_assert(c, c->tot_orphans == 0); |
49d128aa AH |
1749 | err = ubifs_clear_orphans(c); |
1750 | if (err) | |
1751 | goto out; | |
1e51764a AB |
1752 | } |
1753 | ||
1754 | if (!(c->mst_node->flags & cpu_to_le32(UBIFS_MST_DIRTY))) { | |
1755 | c->mst_node->flags |= cpu_to_le32(UBIFS_MST_DIRTY); | |
1756 | err = ubifs_write_master(c); | |
1757 | if (err) | |
1758 | goto out; | |
1759 | } | |
1760 | ||
817aa094 SH |
1761 | if (c->superblock_need_write) { |
1762 | struct ubifs_sb_node *sup = c->sup_node; | |
1763 | ||
1764 | err = ubifs_write_sb_node(c, sup); | |
1765 | if (err) | |
1766 | goto out; | |
1767 | ||
1768 | c->superblock_need_write = 0; | |
1769 | } | |
1770 | ||
1e51764a AB |
1771 | c->ileb_buf = vmalloc(c->leb_size); |
1772 | if (!c->ileb_buf) { | |
1773 | err = -ENOMEM; | |
1774 | goto out; | |
1775 | } | |
1776 | ||
7799953b RW |
1777 | c->write_reserve_buf = kmalloc(COMPRESSED_DATA_NODE_BUF_SZ + \ |
1778 | UBIFS_CIPHER_BLOCK_SIZE, GFP_KERNEL); | |
7203db97 WY |
1779 | if (!c->write_reserve_buf) { |
1780 | err = -ENOMEM; | |
d882962f | 1781 | goto out; |
7203db97 | 1782 | } |
d882962f | 1783 | |
1e51764a AB |
1784 | err = ubifs_lpt_init(c, 0, 1); |
1785 | if (err) | |
1786 | goto out; | |
1787 | ||
1e51764a | 1788 | /* Create background thread */ |
d98c6c35 | 1789 | c->bgt = kthread_run(ubifs_bg_thread, c, "%s", c->bgt_name); |
1e51764a AB |
1790 | if (IS_ERR(c->bgt)) { |
1791 | err = PTR_ERR(c->bgt); | |
1792 | c->bgt = NULL; | |
235c362b | 1793 | ubifs_err(c, "cannot spawn \"%s\", error %d", |
1e51764a | 1794 | c->bgt_name, err); |
2953e73f | 1795 | goto out; |
1e51764a | 1796 | } |
1e51764a AB |
1797 | |
1798 | c->orph_buf = vmalloc(c->leb_size); | |
2953e73f AH |
1799 | if (!c->orph_buf) { |
1800 | err = -ENOMEM; | |
1801 | goto out; | |
1802 | } | |
1e51764a AB |
1803 | |
1804 | /* Check for enough log space */ | |
1805 | lnum = c->lhead_lnum + 1; | |
1806 | if (lnum >= UBIFS_LOG_LNUM + c->log_lebs) | |
1807 | lnum = UBIFS_LOG_LNUM; | |
1808 | if (lnum == c->ltail_lnum) { | |
1809 | err = ubifs_consolidate_log(c); | |
1810 | if (err) | |
1811 | goto out; | |
1812 | } | |
1813 | ||
1e76592f | 1814 | if (c->need_recovery) { |
1e51764a | 1815 | err = ubifs_rcvry_gc_commit(c); |
1e76592f SH |
1816 | if (err) |
1817 | goto out; | |
1818 | ||
1819 | if (ubifs_authenticated(c)) { | |
1820 | err = ubifs_recover_size(c, false); | |
1821 | if (err) | |
1822 | goto out; | |
1823 | } | |
1824 | } else { | |
b4978e94 | 1825 | err = ubifs_leb_unmap(c, c->gc_lnum); |
1e76592f | 1826 | } |
1e51764a AB |
1827 | if (err) |
1828 | goto out; | |
1829 | ||
8c230d9a AB |
1830 | dbg_gen("re-mounted read-write"); |
1831 | c->remounting_rw = 0; | |
1832 | ||
1e51764a AB |
1833 | if (c->need_recovery) { |
1834 | c->need_recovery = 0; | |
235c362b | 1835 | ubifs_msg(c, "deferred recovery completed"); |
8c230d9a AB |
1836 | } else { |
1837 | /* | |
1838 | * Do not run the debugging space check if the were doing | |
1839 | * recovery, because when we saved the information we had the | |
1840 | * file-system in a state where the TNC and lprops has been | |
1841 | * modified in memory, but all the I/O operations (including a | |
1842 | * commit) were deferred. So the file-system was in | |
1843 | * "non-committed" state. Now the file-system is in committed | |
1844 | * state, and of course the amount of free space will change | |
1845 | * because, for example, the old index size was imprecise. | |
1846 | */ | |
1847 | err = dbg_check_space_info(c); | |
1e51764a | 1848 | } |
9d510db4 | 1849 | |
1e51764a | 1850 | mutex_unlock(&c->umount_mutex); |
84abf972 | 1851 | return err; |
1e51764a AB |
1852 | |
1853 | out: | |
c88ac00c | 1854 | c->ro_mount = 1; |
1e51764a AB |
1855 | vfree(c->orph_buf); |
1856 | c->orph_buf = NULL; | |
1857 | if (c->bgt) { | |
1858 | kthread_stop(c->bgt); | |
1859 | c->bgt = NULL; | |
1860 | } | |
d882962f MC |
1861 | kfree(c->write_reserve_buf); |
1862 | c->write_reserve_buf = NULL; | |
1e51764a AB |
1863 | vfree(c->ileb_buf); |
1864 | c->ileb_buf = NULL; | |
1865 | ubifs_lpt_free(c, 1); | |
1866 | c->remounting_rw = 0; | |
1867 | mutex_unlock(&c->umount_mutex); | |
1868 | return err; | |
1869 | } | |
1870 | ||
1e51764a AB |
1871 | /** |
1872 | * ubifs_remount_ro - re-mount in read-only mode. | |
1873 | * @c: UBIFS file-system description object | |
1874 | * | |
84abf972 AB |
1875 | * We assume VFS has stopped writing. Possibly the background thread could be |
1876 | * running a commit, however kthread_stop will wait in that case. | |
1e51764a AB |
1877 | */ |
1878 | static void ubifs_remount_ro(struct ubifs_info *c) | |
1879 | { | |
1880 | int i, err; | |
1881 | ||
6eb61d58 RW |
1882 | ubifs_assert(c, !c->need_recovery); |
1883 | ubifs_assert(c, !c->ro_mount); | |
e4d9b6cb | 1884 | |
1e51764a AB |
1885 | mutex_lock(&c->umount_mutex); |
1886 | if (c->bgt) { | |
1887 | kthread_stop(c->bgt); | |
1888 | c->bgt = NULL; | |
1889 | } | |
1890 | ||
84abf972 AB |
1891 | dbg_save_space_info(c); |
1892 | ||
aac17948 RW |
1893 | for (i = 0; i < c->jhead_cnt; i++) { |
1894 | err = ubifs_wbuf_sync(&c->jheads[i].wbuf); | |
1895 | if (err) | |
1896 | ubifs_ro_mode(c, err); | |
1897 | } | |
1e51764a | 1898 | |
e4d9b6cb AB |
1899 | c->mst_node->flags &= ~cpu_to_le32(UBIFS_MST_DIRTY); |
1900 | c->mst_node->flags |= cpu_to_le32(UBIFS_MST_NO_ORPHS); | |
1901 | c->mst_node->gc_lnum = cpu_to_le32(c->gc_lnum); | |
1902 | err = ubifs_write_master(c); | |
1903 | if (err) | |
1904 | ubifs_ro_mode(c, err); | |
1905 | ||
1e51764a AB |
1906 | vfree(c->orph_buf); |
1907 | c->orph_buf = NULL; | |
d882962f MC |
1908 | kfree(c->write_reserve_buf); |
1909 | c->write_reserve_buf = NULL; | |
1e51764a AB |
1910 | vfree(c->ileb_buf); |
1911 | c->ileb_buf = NULL; | |
1912 | ubifs_lpt_free(c, 1); | |
2ef13294 | 1913 | c->ro_mount = 1; |
84abf972 AB |
1914 | err = dbg_check_space_info(c); |
1915 | if (err) | |
1916 | ubifs_ro_mode(c, err); | |
1e51764a AB |
1917 | mutex_unlock(&c->umount_mutex); |
1918 | } | |
1919 | ||
1920 | static void ubifs_put_super(struct super_block *sb) | |
1921 | { | |
1922 | int i; | |
1923 | struct ubifs_info *c = sb->s_fs_info; | |
1924 | ||
235c362b | 1925 | ubifs_msg(c, "un-mount UBI device %d", c->vi.ubi_num); |
6cfd0148 | 1926 | |
1e51764a AB |
1927 | /* |
1928 | * The following asserts are only valid if there has not been a failure | |
1929 | * of the media. For example, there will be dirty inodes if we failed | |
1930 | * to write them back because of I/O errors. | |
1931 | */ | |
1a067a22 | 1932 | if (!c->ro_error) { |
6eb61d58 RW |
1933 | ubifs_assert(c, c->bi.idx_growth == 0); |
1934 | ubifs_assert(c, c->bi.dd_growth == 0); | |
1935 | ubifs_assert(c, c->bi.data_growth == 0); | |
1a067a22 | 1936 | } |
1e51764a AB |
1937 | |
1938 | /* | |
1939 | * The 'c->umount_lock' prevents races between UBIFS memory shrinker | |
1940 | * and file system un-mount. Namely, it prevents the shrinker from | |
1941 | * picking this superblock for shrinking - it will be just skipped if | |
1942 | * the mutex is locked. | |
1943 | */ | |
1944 | mutex_lock(&c->umount_mutex); | |
2ef13294 | 1945 | if (!c->ro_mount) { |
1e51764a AB |
1946 | /* |
1947 | * First of all kill the background thread to make sure it does | |
1948 | * not interfere with un-mounting and freeing resources. | |
1949 | */ | |
1950 | if (c->bgt) { | |
1951 | kthread_stop(c->bgt); | |
1952 | c->bgt = NULL; | |
1953 | } | |
1954 | ||
1e51764a | 1955 | /* |
2680d722 | 1956 | * On fatal errors c->ro_error is set to 1, in which case we do |
1e51764a AB |
1957 | * not write the master node. |
1958 | */ | |
2680d722 | 1959 | if (!c->ro_error) { |
2ef13294 AB |
1960 | int err; |
1961 | ||
1962 | /* Synchronize write-buffers */ | |
aac17948 RW |
1963 | for (i = 0; i < c->jhead_cnt; i++) { |
1964 | err = ubifs_wbuf_sync(&c->jheads[i].wbuf); | |
1965 | if (err) | |
1966 | ubifs_ro_mode(c, err); | |
1967 | } | |
2ef13294 | 1968 | |
1e51764a AB |
1969 | /* |
1970 | * We are being cleanly unmounted which means the | |
1971 | * orphans were killed - indicate this in the master | |
1972 | * node. Also save the reserved GC LEB number. | |
1973 | */ | |
1e51764a AB |
1974 | c->mst_node->flags &= ~cpu_to_le32(UBIFS_MST_DIRTY); |
1975 | c->mst_node->flags |= cpu_to_le32(UBIFS_MST_NO_ORPHS); | |
1976 | c->mst_node->gc_lnum = cpu_to_le32(c->gc_lnum); | |
1977 | err = ubifs_write_master(c); | |
1978 | if (err) | |
1979 | /* | |
1980 | * Recovery will attempt to fix the master area | |
1981 | * next mount, so we just print a message and | |
1982 | * continue to unmount normally. | |
1983 | */ | |
235c362b | 1984 | ubifs_err(c, "failed to write master node, error %d", |
79fda517 | 1985 | err); |
3601ba27 AB |
1986 | } else { |
1987 | for (i = 0; i < c->jhead_cnt; i++) | |
1988 | /* Make sure write-buffer timers are canceled */ | |
1989 | hrtimer_cancel(&c->jheads[i].wbuf.timer); | |
1e51764a AB |
1990 | } |
1991 | } | |
1992 | ||
1993 | ubifs_umount(c); | |
1e51764a AB |
1994 | ubi_close_volume(c->ubi); |
1995 | mutex_unlock(&c->umount_mutex); | |
1e51764a AB |
1996 | } |
1997 | ||
1998 | static int ubifs_remount_fs(struct super_block *sb, int *flags, char *data) | |
1999 | { | |
2000 | int err; | |
2001 | struct ubifs_info *c = sb->s_fs_info; | |
2002 | ||
02b9984d | 2003 | sync_filesystem(sb); |
1e51764a AB |
2004 | dbg_gen("old flags %#lx, new flags %#x", sb->s_flags, *flags); |
2005 | ||
2006 | err = ubifs_parse_options(c, data, 1); | |
2007 | if (err) { | |
235c362b | 2008 | ubifs_err(c, "invalid or unknown remount parameter"); |
1e51764a AB |
2009 | return err; |
2010 | } | |
3477d204 | 2011 | |
1751e8a6 | 2012 | if (c->ro_mount && !(*flags & SB_RDONLY)) { |
2680d722 | 2013 | if (c->ro_error) { |
235c362b | 2014 | ubifs_msg(c, "cannot re-mount R/W due to prior errors"); |
2680d722 AB |
2015 | return -EROFS; |
2016 | } | |
e4d9b6cb | 2017 | if (c->ro_media) { |
235c362b | 2018 | ubifs_msg(c, "cannot re-mount R/W - UBI volume is R/O"); |
a2b9df3f | 2019 | return -EROFS; |
e4d9b6cb | 2020 | } |
1e51764a | 2021 | err = ubifs_remount_rw(c); |
e9d6bbc4 | 2022 | if (err) |
1e51764a | 2023 | return err; |
1751e8a6 | 2024 | } else if (!c->ro_mount && (*flags & SB_RDONLY)) { |
2680d722 | 2025 | if (c->ro_error) { |
235c362b | 2026 | ubifs_msg(c, "cannot re-mount R/O due to prior errors"); |
a2b9df3f | 2027 | return -EROFS; |
b466f17d | 2028 | } |
1e51764a | 2029 | ubifs_remount_ro(c); |
b466f17d | 2030 | } |
1e51764a | 2031 | |
3477d204 AB |
2032 | if (c->bulk_read == 1) |
2033 | bu_init(c); | |
2034 | else { | |
2035 | dbg_gen("disable bulk-read"); | |
07d41c3c | 2036 | mutex_lock(&c->bu_mutex); |
3477d204 AB |
2037 | kfree(c->bu.buf); |
2038 | c->bu.buf = NULL; | |
07d41c3c | 2039 | mutex_unlock(&c->bu_mutex); |
3477d204 AB |
2040 | } |
2041 | ||
d3bdc016 SH |
2042 | if (!c->need_recovery) |
2043 | ubifs_assert(c, c->lst.taken_empty_lebs > 0); | |
2044 | ||
1e51764a AB |
2045 | return 0; |
2046 | } | |
2047 | ||
e8b81566 | 2048 | const struct super_operations ubifs_super_operations = { |
1e51764a | 2049 | .alloc_inode = ubifs_alloc_inode, |
dc431759 | 2050 | .free_inode = ubifs_free_inode, |
1e51764a AB |
2051 | .put_super = ubifs_put_super, |
2052 | .write_inode = ubifs_write_inode, | |
62de2592 | 2053 | .drop_inode = ubifs_drop_inode, |
d640e1b5 | 2054 | .evict_inode = ubifs_evict_inode, |
1e51764a AB |
2055 | .statfs = ubifs_statfs, |
2056 | .dirty_inode = ubifs_dirty_inode, | |
2057 | .remount_fs = ubifs_remount_fs, | |
2058 | .show_options = ubifs_show_options, | |
2059 | .sync_fs = ubifs_sync_fs, | |
2060 | }; | |
2061 | ||
2062 | /** | |
2063 | * open_ubi - parse UBI device name string and open the UBI device. | |
2064 | * @name: UBI volume name | |
2065 | * @mode: UBI volume open mode | |
2066 | * | |
9722324e | 2067 | * The primary method of mounting UBIFS is by specifying the UBI volume |
07c32de4 | 2068 | * character device node path. However, UBIFS may also be mounted without any |
9722324e CC |
2069 | * character device node using one of the following methods: |
2070 | * | |
2071 | * o ubiX_Y - mount UBI device number X, volume Y; | |
2072 | * o ubiY - mount UBI device number 0, volume Y; | |
1e51764a AB |
2073 | * o ubiX:NAME - mount UBI device X, volume with name NAME; |
2074 | * o ubi:NAME - mount UBI device 0, volume with name NAME. | |
2075 | * | |
2076 | * Alternative '!' separator may be used instead of ':' (because some shells | |
2077 | * like busybox may interpret ':' as an NFS host name separator). This function | |
9722324e CC |
2078 | * returns UBI volume description object in case of success and a negative |
2079 | * error code in case of failure. | |
1e51764a AB |
2080 | */ |
2081 | static struct ubi_volume_desc *open_ubi(const char *name, int mode) | |
2082 | { | |
9722324e | 2083 | struct ubi_volume_desc *ubi; |
1e51764a AB |
2084 | int dev, vol; |
2085 | char *endptr; | |
2086 | ||
37f31b6c RW |
2087 | if (!name || !*name) |
2088 | return ERR_PTR(-EINVAL); | |
2089 | ||
9722324e CC |
2090 | /* First, try to open using the device node path method */ |
2091 | ubi = ubi_open_volume_path(name, mode); | |
2092 | if (!IS_ERR(ubi)) | |
2093 | return ubi; | |
2094 | ||
2095 | /* Try the "nodev" method */ | |
1e51764a AB |
2096 | if (name[0] != 'u' || name[1] != 'b' || name[2] != 'i') |
2097 | return ERR_PTR(-EINVAL); | |
2098 | ||
2099 | /* ubi:NAME method */ | |
2100 | if ((name[3] == ':' || name[3] == '!') && name[4] != '\0') | |
2101 | return ubi_open_volume_nm(0, name + 4, mode); | |
2102 | ||
2103 | if (!isdigit(name[3])) | |
2104 | return ERR_PTR(-EINVAL); | |
2105 | ||
2106 | dev = simple_strtoul(name + 3, &endptr, 0); | |
2107 | ||
2108 | /* ubiY method */ | |
2109 | if (*endptr == '\0') | |
2110 | return ubi_open_volume(0, dev, mode); | |
2111 | ||
2112 | /* ubiX_Y method */ | |
2113 | if (*endptr == '_' && isdigit(endptr[1])) { | |
2114 | vol = simple_strtoul(endptr + 1, &endptr, 0); | |
2115 | if (*endptr != '\0') | |
2116 | return ERR_PTR(-EINVAL); | |
2117 | return ubi_open_volume(dev, vol, mode); | |
2118 | } | |
2119 | ||
2120 | /* ubiX:NAME method */ | |
2121 | if ((*endptr == ':' || *endptr == '!') && endptr[1] != '\0') | |
2122 | return ubi_open_volume_nm(dev, ++endptr, mode); | |
2123 | ||
2124 | return ERR_PTR(-EINVAL); | |
2125 | } | |
2126 | ||
b1c27ab3 AV |
2127 | static struct ubifs_info *alloc_ubifs_info(struct ubi_volume_desc *ubi) |
2128 | { | |
2129 | struct ubifs_info *c; | |
2130 | ||
2131 | c = kzalloc(sizeof(struct ubifs_info), GFP_KERNEL); | |
2132 | if (c) { | |
2133 | spin_lock_init(&c->cnt_lock); | |
2134 | spin_lock_init(&c->cs_lock); | |
2135 | spin_lock_init(&c->buds_lock); | |
2136 | spin_lock_init(&c->space_lock); | |
2137 | spin_lock_init(&c->orphan_lock); | |
2138 | init_rwsem(&c->commit_sem); | |
2139 | mutex_init(&c->lp_mutex); | |
2140 | mutex_init(&c->tnc_mutex); | |
2141 | mutex_init(&c->log_mutex); | |
b1c27ab3 AV |
2142 | mutex_init(&c->umount_mutex); |
2143 | mutex_init(&c->bu_mutex); | |
2144 | mutex_init(&c->write_reserve_mutex); | |
2145 | init_waitqueue_head(&c->cmt_wq); | |
2146 | c->buds = RB_ROOT; | |
2147 | c->old_idx = RB_ROOT; | |
2148 | c->size_tree = RB_ROOT; | |
2149 | c->orph_tree = RB_ROOT; | |
2150 | INIT_LIST_HEAD(&c->infos_list); | |
2151 | INIT_LIST_HEAD(&c->idx_gc); | |
2152 | INIT_LIST_HEAD(&c->replay_list); | |
2153 | INIT_LIST_HEAD(&c->replay_buds); | |
2154 | INIT_LIST_HEAD(&c->uncat_list); | |
2155 | INIT_LIST_HEAD(&c->empty_list); | |
2156 | INIT_LIST_HEAD(&c->freeable_list); | |
2157 | INIT_LIST_HEAD(&c->frdi_idx_list); | |
2158 | INIT_LIST_HEAD(&c->unclean_leb_list); | |
2159 | INIT_LIST_HEAD(&c->old_buds); | |
2160 | INIT_LIST_HEAD(&c->orph_list); | |
2161 | INIT_LIST_HEAD(&c->orph_new); | |
2162 | c->no_chk_data_crc = 1; | |
99a24e02 | 2163 | c->assert_action = ASSACT_RO; |
b1c27ab3 AV |
2164 | |
2165 | c->highest_inum = UBIFS_FIRST_INO; | |
2166 | c->lhead_lnum = c->ltail_lnum = UBIFS_LOG_LNUM; | |
2167 | ||
2168 | ubi_get_volume_info(ubi, &c->vi); | |
2169 | ubi_get_device_info(c->vi.ubi_num, &c->di); | |
2170 | } | |
2171 | return c; | |
2172 | } | |
2173 | ||
1e51764a AB |
2174 | static int ubifs_fill_super(struct super_block *sb, void *data, int silent) |
2175 | { | |
d251ed27 | 2176 | struct ubifs_info *c = sb->s_fs_info; |
1e51764a AB |
2177 | struct inode *root; |
2178 | int err; | |
2179 | ||
8379ea31 | 2180 | c->vfs_sb = sb; |
1e51764a AB |
2181 | /* Re-open the UBI device in read-write mode */ |
2182 | c->ubi = ubi_open_volume(c->vi.ubi_num, c->vi.vol_id, UBI_READWRITE); | |
2183 | if (IS_ERR(c->ubi)) { | |
2184 | err = PTR_ERR(c->ubi); | |
d251ed27 | 2185 | goto out; |
1e51764a AB |
2186 | } |
2187 | ||
99edd458 JK |
2188 | err = ubifs_parse_options(c, data, 0); |
2189 | if (err) | |
2190 | goto out_close; | |
2191 | ||
1e51764a | 2192 | /* |
0a883a05 | 2193 | * UBIFS provides 'backing_dev_info' in order to disable read-ahead. For |
1e51764a AB |
2194 | * UBIFS, I/O is not deferred, it is done immediately in readpage, |
2195 | * which means the user would have to wait not just for their own I/O | |
0a883a05 | 2196 | * but the read-ahead I/O as well i.e. completely pointless. |
1e51764a | 2197 | * |
99edd458 JK |
2198 | * Read-ahead will be disabled because @sb->s_bdi->ra_pages is 0. Also |
2199 | * @sb->s_bdi->capabilities are initialized to 0 so there won't be any | |
2200 | * writeback happening. | |
1e51764a | 2201 | */ |
99edd458 JK |
2202 | err = super_setup_bdi_name(sb, "ubifs_%d_%d", c->vi.ubi_num, |
2203 | c->vi.vol_id); | |
1e51764a AB |
2204 | if (err) |
2205 | goto out_close; | |
55b2598e CH |
2206 | sb->s_bdi->ra_pages = 0; |
2207 | sb->s_bdi->io_pages = 0; | |
1e51764a | 2208 | |
1e51764a AB |
2209 | sb->s_fs_info = c; |
2210 | sb->s_magic = UBIFS_SUPER_MAGIC; | |
2211 | sb->s_blocksize = UBIFS_BLOCK_SIZE; | |
2212 | sb->s_blocksize_bits = UBIFS_BLOCK_SHIFT; | |
1e51764a AB |
2213 | sb->s_maxbytes = c->max_inode_sz = key_max_inode_size(c); |
2214 | if (c->max_inode_sz > MAX_LFS_FILESIZE) | |
2215 | sb->s_maxbytes = c->max_inode_sz = MAX_LFS_FILESIZE; | |
2216 | sb->s_op = &ubifs_super_operations; | |
2b88fc21 | 2217 | sb->s_xattr = ubifs_xattr_handlers; |
eea2c05d | 2218 | fscrypt_set_ops(sb, &ubifs_crypt_operations); |
1e51764a AB |
2219 | |
2220 | mutex_lock(&c->umount_mutex); | |
2221 | err = mount_ubifs(c); | |
2222 | if (err) { | |
6eb61d58 | 2223 | ubifs_assert(c, err < 0); |
1e51764a AB |
2224 | goto out_unlock; |
2225 | } | |
2226 | ||
2227 | /* Read the root inode */ | |
2228 | root = ubifs_iget(sb, UBIFS_ROOT_INO); | |
2229 | if (IS_ERR(root)) { | |
2230 | err = PTR_ERR(root); | |
2231 | goto out_umount; | |
2232 | } | |
2233 | ||
48fde701 | 2234 | sb->s_root = d_make_root(root); |
7203db97 WY |
2235 | if (!sb->s_root) { |
2236 | err = -ENOMEM; | |
48fde701 | 2237 | goto out_umount; |
7203db97 | 2238 | } |
1e51764a | 2239 | |
af61e7bf ST |
2240 | import_uuid(&sb->s_uuid, c->uuid); |
2241 | ||
1e51764a | 2242 | mutex_unlock(&c->umount_mutex); |
1e51764a AB |
2243 | return 0; |
2244 | ||
1e51764a AB |
2245 | out_umount: |
2246 | ubifs_umount(c); | |
2247 | out_unlock: | |
2248 | mutex_unlock(&c->umount_mutex); | |
1e51764a | 2249 | out_close: |
47f6d9ce | 2250 | ubifs_release_options(c); |
1e51764a | 2251 | ubi_close_volume(c->ubi); |
d251ed27 | 2252 | out: |
1e51764a AB |
2253 | return err; |
2254 | } | |
2255 | ||
2256 | static int sb_test(struct super_block *sb, void *data) | |
2257 | { | |
d251ed27 | 2258 | struct ubifs_info *c1 = data; |
7c83f5cb | 2259 | struct ubifs_info *c = sb->s_fs_info; |
1e51764a | 2260 | |
d251ed27 AV |
2261 | return c->vi.cdev == c1->vi.cdev; |
2262 | } | |
2263 | ||
2264 | static int sb_set(struct super_block *sb, void *data) | |
2265 | { | |
2266 | sb->s_fs_info = data; | |
2267 | return set_anon_super(sb, NULL); | |
1e51764a AB |
2268 | } |
2269 | ||
157d81e7 AV |
2270 | static struct dentry *ubifs_mount(struct file_system_type *fs_type, int flags, |
2271 | const char *name, void *data) | |
1e51764a AB |
2272 | { |
2273 | struct ubi_volume_desc *ubi; | |
d251ed27 | 2274 | struct ubifs_info *c; |
1e51764a AB |
2275 | struct super_block *sb; |
2276 | int err; | |
2277 | ||
2278 | dbg_gen("name %s, flags %#x", name, flags); | |
2279 | ||
2280 | /* | |
2281 | * Get UBI device number and volume ID. Mount it read-only so far | |
2282 | * because this might be a new mount point, and UBI allows only one | |
2283 | * read-write user at a time. | |
2284 | */ | |
2285 | ubi = open_ubi(name, UBI_READONLY); | |
2286 | if (IS_ERR(ubi)) { | |
1751e8a6 | 2287 | if (!(flags & SB_SILENT)) |
1ae92642 DG |
2288 | pr_err("UBIFS error (pid: %d): cannot open \"%s\", error %d", |
2289 | current->pid, name, (int)PTR_ERR(ubi)); | |
157d81e7 | 2290 | return ERR_CAST(ubi); |
1e51764a | 2291 | } |
1e51764a | 2292 | |
d251ed27 AV |
2293 | c = alloc_ubifs_info(ubi); |
2294 | if (!c) { | |
2295 | err = -ENOMEM; | |
2296 | goto out_close; | |
2297 | } | |
2298 | ||
2299 | dbg_gen("opened ubi%d_%d", c->vi.ubi_num, c->vi.vol_id); | |
1e51764a | 2300 | |
9249e17f | 2301 | sb = sget(fs_type, sb_test, sb_set, flags, c); |
1e51764a AB |
2302 | if (IS_ERR(sb)) { |
2303 | err = PTR_ERR(sb); | |
d251ed27 | 2304 | kfree(c); |
185bf873 | 2305 | goto out_close; |
1e51764a AB |
2306 | } |
2307 | ||
2308 | if (sb->s_root) { | |
2ef13294 | 2309 | struct ubifs_info *c1 = sb->s_fs_info; |
d251ed27 | 2310 | kfree(c); |
1e51764a AB |
2311 | /* A new mount point for already mounted UBIFS */ |
2312 | dbg_gen("this ubi volume is already mounted"); | |
1751e8a6 | 2313 | if (!!(flags & SB_RDONLY) != c1->ro_mount) { |
1e51764a AB |
2314 | err = -EBUSY; |
2315 | goto out_deact; | |
2316 | } | |
2317 | } else { | |
1751e8a6 | 2318 | err = ubifs_fill_super(sb, data, flags & SB_SILENT ? 1 : 0); |
91cbf011 | 2319 | if (err) |
1e51764a AB |
2320 | goto out_deact; |
2321 | /* We do not support atime */ | |
1751e8a6 | 2322 | sb->s_flags |= SB_ACTIVE; |
e3d73dea SH |
2323 | if (IS_ENABLED(CONFIG_UBIFS_ATIME_SUPPORT)) |
2324 | ubifs_msg(c, "full atime support is enabled."); | |
2325 | else | |
2326 | sb->s_flags |= SB_NOATIME; | |
1e51764a AB |
2327 | } |
2328 | ||
2329 | /* 'fill_super()' opens ubi again so we must close it here */ | |
2330 | ubi_close_volume(ubi); | |
2331 | ||
157d81e7 | 2332 | return dget(sb->s_root); |
1e51764a AB |
2333 | |
2334 | out_deact: | |
6f5bbff9 | 2335 | deactivate_locked_super(sb); |
1e51764a AB |
2336 | out_close: |
2337 | ubi_close_volume(ubi); | |
157d81e7 | 2338 | return ERR_PTR(err); |
1e51764a AB |
2339 | } |
2340 | ||
d251ed27 AV |
2341 | static void kill_ubifs_super(struct super_block *s) |
2342 | { | |
2343 | struct ubifs_info *c = s->s_fs_info; | |
2344 | kill_anon_super(s); | |
2345 | kfree(c); | |
2346 | } | |
2347 | ||
1e51764a AB |
2348 | static struct file_system_type ubifs_fs_type = { |
2349 | .name = "ubifs", | |
2350 | .owner = THIS_MODULE, | |
157d81e7 | 2351 | .mount = ubifs_mount, |
d251ed27 | 2352 | .kill_sb = kill_ubifs_super, |
1e51764a | 2353 | }; |
7f78e035 | 2354 | MODULE_ALIAS_FS("ubifs"); |
1e51764a AB |
2355 | |
2356 | /* | |
2357 | * Inode slab cache constructor. | |
2358 | */ | |
51cc5068 | 2359 | static void inode_slab_ctor(void *obj) |
1e51764a AB |
2360 | { |
2361 | struct ubifs_inode *ui = obj; | |
2362 | inode_init_once(&ui->vfs_inode); | |
2363 | } | |
2364 | ||
2365 | static int __init ubifs_init(void) | |
2366 | { | |
2367 | int err; | |
2368 | ||
2369 | BUILD_BUG_ON(sizeof(struct ubifs_ch) != 24); | |
2370 | ||
2371 | /* Make sure node sizes are 8-byte aligned */ | |
2372 | BUILD_BUG_ON(UBIFS_CH_SZ & 7); | |
2373 | BUILD_BUG_ON(UBIFS_INO_NODE_SZ & 7); | |
2374 | BUILD_BUG_ON(UBIFS_DENT_NODE_SZ & 7); | |
2375 | BUILD_BUG_ON(UBIFS_XENT_NODE_SZ & 7); | |
2376 | BUILD_BUG_ON(UBIFS_DATA_NODE_SZ & 7); | |
2377 | BUILD_BUG_ON(UBIFS_TRUN_NODE_SZ & 7); | |
2378 | BUILD_BUG_ON(UBIFS_SB_NODE_SZ & 7); | |
2379 | BUILD_BUG_ON(UBIFS_MST_NODE_SZ & 7); | |
2380 | BUILD_BUG_ON(UBIFS_REF_NODE_SZ & 7); | |
2381 | BUILD_BUG_ON(UBIFS_CS_NODE_SZ & 7); | |
2382 | BUILD_BUG_ON(UBIFS_ORPH_NODE_SZ & 7); | |
2383 | ||
2384 | BUILD_BUG_ON(UBIFS_MAX_DENT_NODE_SZ & 7); | |
2385 | BUILD_BUG_ON(UBIFS_MAX_XENT_NODE_SZ & 7); | |
2386 | BUILD_BUG_ON(UBIFS_MAX_DATA_NODE_SZ & 7); | |
2387 | BUILD_BUG_ON(UBIFS_MAX_INO_NODE_SZ & 7); | |
2388 | BUILD_BUG_ON(UBIFS_MAX_NODE_SZ & 7); | |
2389 | BUILD_BUG_ON(MIN_WRITE_SZ & 7); | |
2390 | ||
2391 | /* Check min. node size */ | |
2392 | BUILD_BUG_ON(UBIFS_INO_NODE_SZ < MIN_WRITE_SZ); | |
2393 | BUILD_BUG_ON(UBIFS_DENT_NODE_SZ < MIN_WRITE_SZ); | |
2394 | BUILD_BUG_ON(UBIFS_XENT_NODE_SZ < MIN_WRITE_SZ); | |
2395 | BUILD_BUG_ON(UBIFS_TRUN_NODE_SZ < MIN_WRITE_SZ); | |
2396 | ||
2397 | BUILD_BUG_ON(UBIFS_MAX_DENT_NODE_SZ > UBIFS_MAX_NODE_SZ); | |
2398 | BUILD_BUG_ON(UBIFS_MAX_XENT_NODE_SZ > UBIFS_MAX_NODE_SZ); | |
2399 | BUILD_BUG_ON(UBIFS_MAX_DATA_NODE_SZ > UBIFS_MAX_NODE_SZ); | |
2400 | BUILD_BUG_ON(UBIFS_MAX_INO_NODE_SZ > UBIFS_MAX_NODE_SZ); | |
2401 | ||
2402 | /* Defined node sizes */ | |
2403 | BUILD_BUG_ON(UBIFS_SB_NODE_SZ != 4096); | |
2404 | BUILD_BUG_ON(UBIFS_MST_NODE_SZ != 512); | |
2405 | BUILD_BUG_ON(UBIFS_INO_NODE_SZ != 160); | |
2406 | BUILD_BUG_ON(UBIFS_REF_NODE_SZ != 64); | |
2407 | ||
a1dc080c AB |
2408 | /* |
2409 | * We use 2 bit wide bit-fields to store compression type, which should | |
2410 | * be amended if more compressors are added. The bit-fields are: | |
553dea4d AB |
2411 | * @compr_type in 'struct ubifs_inode', @default_compr in |
2412 | * 'struct ubifs_info' and @compr_type in 'struct ubifs_mount_opts'. | |
a1dc080c AB |
2413 | */ |
2414 | BUILD_BUG_ON(UBIFS_COMPR_TYPES_CNT > 4); | |
2415 | ||
1e51764a | 2416 | /* |
ea1754a0 | 2417 | * We require that PAGE_SIZE is greater-than-or-equal-to |
1e51764a AB |
2418 | * UBIFS_BLOCK_SIZE. It is assumed that both are powers of 2. |
2419 | */ | |
09cbfeaf | 2420 | if (PAGE_SIZE < UBIFS_BLOCK_SIZE) { |
235c362b | 2421 | pr_err("UBIFS error (pid %d): VFS page cache size is %u bytes, but UBIFS requires at least 4096 bytes", |
09cbfeaf | 2422 | current->pid, (unsigned int)PAGE_SIZE); |
1e51764a AB |
2423 | return -EINVAL; |
2424 | } | |
2425 | ||
1e51764a AB |
2426 | ubifs_inode_slab = kmem_cache_create("ubifs_inode_slab", |
2427 | sizeof(struct ubifs_inode), 0, | |
5d097056 VD |
2428 | SLAB_MEM_SPREAD | SLAB_RECLAIM_ACCOUNT | |
2429 | SLAB_ACCOUNT, &inode_slab_ctor); | |
1e51764a | 2430 | if (!ubifs_inode_slab) |
5cc361e3 | 2431 | return -ENOMEM; |
1e51764a | 2432 | |
a1fe33af CY |
2433 | err = register_shrinker(&ubifs_shrinker_info); |
2434 | if (err) | |
2435 | goto out_slab; | |
1e51764a AB |
2436 | |
2437 | err = ubifs_compressors_init(); | |
552ff317 AB |
2438 | if (err) |
2439 | goto out_shrinker; | |
2440 | ||
702d6a83 | 2441 | dbg_debugfs_init(); |
1e51764a | 2442 | |
2e3cbf42 SS |
2443 | err = ubifs_sysfs_init(); |
2444 | if (err) | |
2445 | goto out_dbg; | |
2446 | ||
5cc361e3 AV |
2447 | err = register_filesystem(&ubifs_fs_type); |
2448 | if (err) { | |
235c362b SY |
2449 | pr_err("UBIFS error (pid %d): cannot register file system, error %d", |
2450 | current->pid, err); | |
2e3cbf42 | 2451 | goto out_sysfs; |
5cc361e3 | 2452 | } |
1e51764a AB |
2453 | return 0; |
2454 | ||
2e3cbf42 SS |
2455 | out_sysfs: |
2456 | ubifs_sysfs_exit(); | |
5cc361e3 AV |
2457 | out_dbg: |
2458 | dbg_debugfs_exit(); | |
552ff317 AB |
2459 | ubifs_compressors_exit(); |
2460 | out_shrinker: | |
1e51764a | 2461 | unregister_shrinker(&ubifs_shrinker_info); |
a1fe33af | 2462 | out_slab: |
1e51764a | 2463 | kmem_cache_destroy(ubifs_inode_slab); |
1e51764a AB |
2464 | return err; |
2465 | } | |
2466 | /* late_initcall to let compressors initialize first */ | |
2467 | late_initcall(ubifs_init); | |
2468 | ||
2469 | static void __exit ubifs_exit(void) | |
2470 | { | |
f8ccb14f RW |
2471 | WARN_ON(!list_empty(&ubifs_infos)); |
2472 | WARN_ON(atomic_long_read(&ubifs_clean_zn_cnt) != 0); | |
1e51764a | 2473 | |
552ff317 | 2474 | dbg_debugfs_exit(); |
2e3cbf42 | 2475 | ubifs_sysfs_exit(); |
1e51764a AB |
2476 | ubifs_compressors_exit(); |
2477 | unregister_shrinker(&ubifs_shrinker_info); | |
8c0a8537 KS |
2478 | |
2479 | /* | |
2480 | * Make sure all delayed rcu free inodes are flushed before we | |
2481 | * destroy cache. | |
2482 | */ | |
2483 | rcu_barrier(); | |
1e51764a AB |
2484 | kmem_cache_destroy(ubifs_inode_slab); |
2485 | unregister_filesystem(&ubifs_fs_type); | |
2486 | } | |
2487 | module_exit(ubifs_exit); | |
2488 | ||
2489 | MODULE_LICENSE("GPL"); | |
2490 | MODULE_VERSION(__stringify(UBIFS_VERSION)); | |
2491 | MODULE_AUTHOR("Artem Bityutskiy, Adrian Hunter"); | |
2492 | MODULE_DESCRIPTION("UBIFS - UBI File System"); |