Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/fs/fat/inode.c | |
3 | * | |
4 | * Written 1992,1993 by Werner Almesberger | |
5 | * VFAT extensions by Gordon Chaffee, merged with msdos fs by Henrik Storner | |
6 | * Rewritten for the constant inumbers support by Al Viro | |
7 | * | |
8 | * Fixes: | |
9 | * | |
10 | * Max Cohan: Fixed invalid FSINFO offset when info_sector is 0 | |
11 | */ | |
12 | ||
13 | #include <linux/module.h> | |
1da177e4 | 14 | #include <linux/pagemap.h> |
a5425d29 | 15 | #include <linux/mpage.h> |
1da177e4 | 16 | #include <linux/vfs.h> |
58932ef7 | 17 | #include <linux/seq_file.h> |
1da177e4 | 18 | #include <linux/parser.h> |
e5174baa | 19 | #include <linux/uio.h> |
f562146a | 20 | #include <linux/blkdev.h> |
66114cad | 21 | #include <linux/backing-dev.h> |
1da177e4 | 22 | #include <asm/unaligned.h> |
9e975dae | 23 | #include "fat.h" |
1da177e4 LT |
24 | |
25 | #ifndef CONFIG_FAT_DEFAULT_IOCHARSET | |
26 | /* if user don't select VFAT, this is undefined. */ | |
27 | #define CONFIG_FAT_DEFAULT_IOCHARSET "" | |
28 | #endif | |
29 | ||
190a8843 CM |
30 | #define KB_IN_SECTORS 2 |
31 | ||
32 | /* | |
33 | * A deserialized copy of the on-disk structure laid out in struct | |
34 | * fat_boot_sector. | |
35 | */ | |
36 | struct fat_bios_param_block { | |
37 | u16 fat_sector_size; | |
38 | u8 fat_sec_per_clus; | |
39 | u16 fat_reserved; | |
40 | u8 fat_fats; | |
41 | u16 fat_dir_entries; | |
42 | u16 fat_sectors; | |
43 | u16 fat_fat_length; | |
44 | u32 fat_total_sect; | |
45 | ||
46 | u8 fat16_state; | |
47 | u32 fat16_vol_id; | |
48 | ||
49 | u32 fat32_length; | |
50 | u32 fat32_root_cluster; | |
51 | u16 fat32_info_sector; | |
52 | u8 fat32_state; | |
53 | u32 fat32_vol_id; | |
54 | }; | |
55 | ||
1da177e4 LT |
56 | static int fat_default_codepage = CONFIG_FAT_DEFAULT_CODEPAGE; |
57 | static char fat_default_iocharset[] = CONFIG_FAT_DEFAULT_IOCHARSET; | |
58 | ||
190a8843 CM |
59 | static struct fat_floppy_defaults { |
60 | unsigned nr_sectors; | |
61 | unsigned sec_per_clus; | |
62 | unsigned dir_entries; | |
63 | unsigned media; | |
64 | unsigned fat_length; | |
65 | } floppy_defaults[] = { | |
66 | { | |
67 | .nr_sectors = 160 * KB_IN_SECTORS, | |
68 | .sec_per_clus = 1, | |
69 | .dir_entries = 64, | |
70 | .media = 0xFE, | |
71 | .fat_length = 1, | |
72 | }, | |
73 | { | |
74 | .nr_sectors = 180 * KB_IN_SECTORS, | |
75 | .sec_per_clus = 1, | |
76 | .dir_entries = 64, | |
77 | .media = 0xFC, | |
78 | .fat_length = 2, | |
79 | }, | |
80 | { | |
81 | .nr_sectors = 320 * KB_IN_SECTORS, | |
82 | .sec_per_clus = 2, | |
83 | .dir_entries = 112, | |
84 | .media = 0xFF, | |
85 | .fat_length = 1, | |
86 | }, | |
87 | { | |
88 | .nr_sectors = 360 * KB_IN_SECTORS, | |
89 | .sec_per_clus = 2, | |
90 | .dir_entries = 112, | |
91 | .media = 0xFD, | |
92 | .fat_length = 2, | |
93 | }, | |
94 | }; | |
1da177e4 LT |
95 | |
96 | static int fat_add_cluster(struct inode *inode) | |
97 | { | |
98 | int err, cluster; | |
99 | ||
100 | err = fat_alloc_clusters(inode, &cluster, 1); | |
101 | if (err) | |
102 | return err; | |
103 | /* FIXME: this cluster should be added after data of this | |
104 | * cluster is writed */ | |
105 | err = fat_chain_add(inode, cluster, 1); | |
106 | if (err) | |
107 | fat_free_clusters(inode, cluster); | |
108 | return err; | |
109 | } | |
110 | ||
6a1d9805 OH |
111 | static inline int __fat_get_block(struct inode *inode, sector_t iblock, |
112 | unsigned long *max_blocks, | |
113 | struct buffer_head *bh_result, int create) | |
1da177e4 LT |
114 | { |
115 | struct super_block *sb = inode->i_sb; | |
e5174baa | 116 | struct msdos_sb_info *sbi = MSDOS_SB(sb); |
e5174baa | 117 | unsigned long mapped_blocks; |
6a1d9805 | 118 | sector_t phys; |
e5174baa | 119 | int err, offset; |
1da177e4 | 120 | |
2bdf67eb | 121 | err = fat_bmap(inode, iblock, &phys, &mapped_blocks, create); |
1da177e4 LT |
122 | if (err) |
123 | return err; | |
124 | if (phys) { | |
125 | map_bh(bh_result, sb, phys); | |
e5174baa | 126 | *max_blocks = min(mapped_blocks, *max_blocks); |
1da177e4 LT |
127 | return 0; |
128 | } | |
129 | if (!create) | |
130 | return 0; | |
e5174baa | 131 | |
1da177e4 | 132 | if (iblock != MSDOS_I(inode)->mmu_private >> sb->s_blocksize_bits) { |
85c78591 | 133 | fat_fs_error(sb, "corrupted file size (i_pos %lld, %lld)", |
6a1d9805 | 134 | MSDOS_I(inode)->i_pos, MSDOS_I(inode)->mmu_private); |
1da177e4 LT |
135 | return -EIO; |
136 | } | |
e5174baa OH |
137 | |
138 | offset = (unsigned long)iblock & (sbi->sec_per_clus - 1); | |
139 | if (!offset) { | |
140 | /* TODO: multiple cluster allocation would be desirable. */ | |
1da177e4 LT |
141 | err = fat_add_cluster(inode); |
142 | if (err) | |
143 | return err; | |
144 | } | |
e5174baa OH |
145 | /* available blocks on this cluster */ |
146 | mapped_blocks = sbi->sec_per_clus - offset; | |
147 | ||
148 | *max_blocks = min(mapped_blocks, *max_blocks); | |
149 | MSDOS_I(inode)->mmu_private += *max_blocks << sb->s_blocksize_bits; | |
150 | ||
2bdf67eb | 151 | err = fat_bmap(inode, iblock, &phys, &mapped_blocks, create); |
1da177e4 LT |
152 | if (err) |
153 | return err; | |
6a1d9805 | 154 | |
e5174baa OH |
155 | BUG_ON(!phys); |
156 | BUG_ON(*max_blocks != mapped_blocks); | |
1da177e4 LT |
157 | set_buffer_new(bh_result); |
158 | map_bh(bh_result, sb, phys); | |
6a1d9805 | 159 | |
1da177e4 LT |
160 | return 0; |
161 | } | |
162 | ||
6a1d9805 OH |
163 | static int fat_get_block(struct inode *inode, sector_t iblock, |
164 | struct buffer_head *bh_result, int create) | |
e5174baa OH |
165 | { |
166 | struct super_block *sb = inode->i_sb; | |
1d8fa7a2 | 167 | unsigned long max_blocks = bh_result->b_size >> inode->i_blkbits; |
6a1d9805 | 168 | int err; |
e5174baa | 169 | |
6a1d9805 | 170 | err = __fat_get_block(inode, iblock, &max_blocks, bh_result, create); |
e5174baa OH |
171 | if (err) |
172 | return err; | |
173 | bh_result->b_size = max_blocks << sb->s_blocksize_bits; | |
174 | return 0; | |
175 | } | |
176 | ||
1da177e4 LT |
177 | static int fat_writepage(struct page *page, struct writeback_control *wbc) |
178 | { | |
179 | return block_write_full_page(page, fat_get_block, wbc); | |
180 | } | |
181 | ||
a5425d29 OH |
182 | static int fat_writepages(struct address_space *mapping, |
183 | struct writeback_control *wbc) | |
184 | { | |
185 | return mpage_writepages(mapping, wbc, fat_get_block); | |
186 | } | |
187 | ||
1da177e4 LT |
188 | static int fat_readpage(struct file *file, struct page *page) |
189 | { | |
a5425d29 OH |
190 | return mpage_readpage(page, fat_get_block); |
191 | } | |
192 | ||
193 | static int fat_readpages(struct file *file, struct address_space *mapping, | |
194 | struct list_head *pages, unsigned nr_pages) | |
195 | { | |
196 | return mpage_readpages(mapping, pages, nr_pages, fat_get_block); | |
1da177e4 LT |
197 | } |
198 | ||
459f6ed3 | 199 | static void fat_write_failed(struct address_space *mapping, loff_t to) |
200 | { | |
201 | struct inode *inode = mapping->host; | |
202 | ||
203 | if (to > inode->i_size) { | |
7caef267 | 204 | truncate_pagecache(inode, inode->i_size); |
459f6ed3 | 205 | fat_truncate_blocks(inode, inode->i_size); |
206 | } | |
207 | } | |
208 | ||
d7777a25 NP |
209 | static int fat_write_begin(struct file *file, struct address_space *mapping, |
210 | loff_t pos, unsigned len, unsigned flags, | |
211 | struct page **pagep, void **fsdata) | |
1da177e4 | 212 | { |
459f6ed3 | 213 | int err; |
214 | ||
d7777a25 | 215 | *pagep = NULL; |
282dc178 | 216 | err = cont_write_begin(file, mapping, pos, len, flags, |
459f6ed3 | 217 | pagep, fsdata, fat_get_block, |
d7777a25 | 218 | &MSDOS_I(mapping->host)->mmu_private); |
459f6ed3 | 219 | if (err < 0) |
220 | fat_write_failed(mapping, pos + len); | |
221 | return err; | |
1da177e4 LT |
222 | } |
223 | ||
d7777a25 NP |
224 | static int fat_write_end(struct file *file, struct address_space *mapping, |
225 | loff_t pos, unsigned len, unsigned copied, | |
226 | struct page *pagep, void *fsdata) | |
ef402268 | 227 | { |
d7777a25 NP |
228 | struct inode *inode = mapping->host; |
229 | int err; | |
230 | err = generic_write_end(file, mapping, pos, len, copied, pagep, fsdata); | |
459f6ed3 | 231 | if (err < len) |
232 | fat_write_failed(mapping, pos + len); | |
d7777a25 | 233 | if (!(err < 0) && !(MSDOS_I(inode)->i_attrs & ATTR_ARCH)) { |
ef402268 OH |
234 | inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC; |
235 | MSDOS_I(inode)->i_attrs |= ATTR_ARCH; | |
236 | mark_inode_dirty(inode); | |
237 | } | |
238 | return err; | |
239 | } | |
240 | ||
22c6186e | 241 | static ssize_t fat_direct_IO(struct kiocb *iocb, struct iov_iter *iter, |
d8d3d94b | 242 | loff_t offset) |
e5174baa OH |
243 | { |
244 | struct file *file = iocb->ki_filp; | |
459f6ed3 | 245 | struct address_space *mapping = file->f_mapping; |
246 | struct inode *inode = mapping->host; | |
a6cbcd4a | 247 | size_t count = iov_iter_count(iter); |
459f6ed3 | 248 | ssize_t ret; |
e5174baa | 249 | |
6f673763 | 250 | if (iov_iter_rw(iter) == WRITE) { |
e5174baa | 251 | /* |
4e02ed4b | 252 | * FIXME: blockdev_direct_IO() doesn't use ->write_begin(), |
e5174baa OH |
253 | * so we need to update the ->mmu_private to block boundary. |
254 | * | |
255 | * But we must fill the remaining area or hole by nul for | |
256 | * updating ->mmu_private. | |
94412a96 OH |
257 | * |
258 | * Return 0, and fallback to normal buffered write. | |
e5174baa | 259 | */ |
a6cbcd4a | 260 | loff_t size = offset + count; |
e5174baa | 261 | if (MSDOS_I(inode)->mmu_private < size) |
94412a96 | 262 | return 0; |
e5174baa OH |
263 | } |
264 | ||
265 | /* | |
266 | * FAT need to use the DIO_LOCKING for avoiding the race | |
267 | * condition of fat_get_block() and ->truncate(). | |
268 | */ | |
17f8c842 | 269 | ret = blockdev_direct_IO(iocb, inode, iter, offset, fat_get_block); |
6f673763 | 270 | if (ret < 0 && iov_iter_rw(iter) == WRITE) |
a6cbcd4a | 271 | fat_write_failed(mapping, offset + count); |
459f6ed3 | 272 | |
273 | return ret; | |
e5174baa OH |
274 | } |
275 | ||
1da177e4 LT |
276 | static sector_t _fat_bmap(struct address_space *mapping, sector_t block) |
277 | { | |
fa93ca18 OH |
278 | sector_t blocknr; |
279 | ||
280 | /* fat_get_cluster() assumes the requested blocknr isn't truncated. */ | |
58268691 | 281 | down_read(&MSDOS_I(mapping->host)->truncate_lock); |
fa93ca18 | 282 | blocknr = generic_block_bmap(mapping, block, fat_get_block); |
58268691 | 283 | up_read(&MSDOS_I(mapping->host)->truncate_lock); |
fa93ca18 OH |
284 | |
285 | return blocknr; | |
1da177e4 LT |
286 | } |
287 | ||
c0ef0cc9 NJ |
288 | /* |
289 | * fat_block_truncate_page() zeroes out a mapping from file offset `from' | |
290 | * up to the end of the block which corresponds to `from'. | |
291 | * This is required during truncate to physically zeroout the tail end | |
292 | * of that block so it doesn't yield old data if the file is later grown. | |
293 | * Also, avoid causing failure from fsx for cases of "data past EOF" | |
294 | */ | |
295 | int fat_block_truncate_page(struct inode *inode, loff_t from) | |
296 | { | |
297 | return block_truncate_page(inode->i_mapping, from, fat_get_block); | |
298 | } | |
299 | ||
f5e54d6e | 300 | static const struct address_space_operations fat_aops = { |
1da177e4 | 301 | .readpage = fat_readpage, |
a5425d29 | 302 | .readpages = fat_readpages, |
1da177e4 | 303 | .writepage = fat_writepage, |
a5425d29 | 304 | .writepages = fat_writepages, |
d7777a25 NP |
305 | .write_begin = fat_write_begin, |
306 | .write_end = fat_write_end, | |
e5174baa | 307 | .direct_IO = fat_direct_IO, |
1da177e4 LT |
308 | .bmap = _fat_bmap |
309 | }; | |
310 | ||
311 | /* | |
312 | * New FAT inode stuff. We do the following: | |
313 | * a) i_ino is constant and has nothing with on-disk location. | |
314 | * b) FAT manages its own cache of directory entries. | |
315 | * c) *This* cache is indexed by on-disk location. | |
316 | * d) inode has an associated directory entry, all right, but | |
317 | * it may be unhashed. | |
318 | * e) currently entries are stored within struct inode. That should | |
319 | * change. | |
320 | * f) we deal with races in the following way: | |
321 | * 1. readdir() and lookup() do FAT-dir-cache lookup. | |
322 | * 2. rename() unhashes the F-d-c entry and rehashes it in | |
323 | * a new place. | |
324 | * 3. unlink() and rmdir() unhash F-d-c entry. | |
325 | * 4. fat_write_inode() checks whether the thing is unhashed. | |
326 | * If it is we silently return. If it isn't we do bread(), | |
327 | * check if the location is still valid and retry if it | |
328 | * isn't. Otherwise we do changes. | |
329 | * 5. Spinlock is used to protect hash/unhash/location check/lookup | |
deee3ce4 | 330 | * 6. fat_evict_inode() unhashes the F-d-c entry. |
1da177e4 LT |
331 | * 7. lookup() and readdir() do igrab() if they find a F-d-c entry |
332 | * and consider negative result as cache miss. | |
333 | */ | |
334 | ||
335 | static void fat_hash_init(struct super_block *sb) | |
336 | { | |
337 | struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
338 | int i; | |
339 | ||
340 | spin_lock_init(&sbi->inode_hash_lock); | |
341 | for (i = 0; i < FAT_HASH_SIZE; i++) | |
342 | INIT_HLIST_HEAD(&sbi->inode_hashtable[i]); | |
343 | } | |
344 | ||
d3dfa822 | 345 | static inline unsigned long fat_hash(loff_t i_pos) |
1da177e4 | 346 | { |
d3dfa822 | 347 | return hash_32(i_pos, FAT_HASH_BITS); |
1da177e4 LT |
348 | } |
349 | ||
7669e8fb SM |
350 | static void dir_hash_init(struct super_block *sb) |
351 | { | |
352 | struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
353 | int i; | |
354 | ||
355 | spin_lock_init(&sbi->dir_hash_lock); | |
356 | for (i = 0; i < FAT_HASH_SIZE; i++) | |
357 | INIT_HLIST_HEAD(&sbi->dir_hashtable[i]); | |
358 | } | |
359 | ||
1da177e4 LT |
360 | void fat_attach(struct inode *inode, loff_t i_pos) |
361 | { | |
d3dfa822 | 362 | struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb); |
1da177e4 | 363 | |
7669e8fb SM |
364 | if (inode->i_ino != MSDOS_ROOT_INO) { |
365 | struct hlist_head *head = sbi->inode_hashtable | |
366 | + fat_hash(i_pos); | |
367 | ||
368 | spin_lock(&sbi->inode_hash_lock); | |
369 | MSDOS_I(inode)->i_pos = i_pos; | |
370 | hlist_add_head(&MSDOS_I(inode)->i_fat_hash, head); | |
371 | spin_unlock(&sbi->inode_hash_lock); | |
372 | } | |
373 | ||
374 | /* If NFS support is enabled, cache the mapping of start cluster | |
375 | * to directory inode. This is used during reconnection of | |
376 | * dentries to the filesystem root. | |
377 | */ | |
378 | if (S_ISDIR(inode->i_mode) && sbi->options.nfs) { | |
379 | struct hlist_head *d_head = sbi->dir_hashtable; | |
380 | d_head += fat_dir_hash(MSDOS_I(inode)->i_logstart); | |
381 | ||
382 | spin_lock(&sbi->dir_hash_lock); | |
383 | hlist_add_head(&MSDOS_I(inode)->i_dir_hash, d_head); | |
384 | spin_unlock(&sbi->dir_hash_lock); | |
385 | } | |
1da177e4 | 386 | } |
7c709d00 | 387 | EXPORT_SYMBOL_GPL(fat_attach); |
1da177e4 LT |
388 | |
389 | void fat_detach(struct inode *inode) | |
390 | { | |
391 | struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb); | |
392 | spin_lock(&sbi->inode_hash_lock); | |
393 | MSDOS_I(inode)->i_pos = 0; | |
394 | hlist_del_init(&MSDOS_I(inode)->i_fat_hash); | |
395 | spin_unlock(&sbi->inode_hash_lock); | |
7669e8fb SM |
396 | |
397 | if (S_ISDIR(inode->i_mode) && sbi->options.nfs) { | |
398 | spin_lock(&sbi->dir_hash_lock); | |
399 | hlist_del_init(&MSDOS_I(inode)->i_dir_hash); | |
400 | spin_unlock(&sbi->dir_hash_lock); | |
401 | } | |
1da177e4 | 402 | } |
7c709d00 | 403 | EXPORT_SYMBOL_GPL(fat_detach); |
1da177e4 LT |
404 | |
405 | struct inode *fat_iget(struct super_block *sb, loff_t i_pos) | |
406 | { | |
407 | struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
d3dfa822 | 408 | struct hlist_head *head = sbi->inode_hashtable + fat_hash(i_pos); |
1da177e4 LT |
409 | struct msdos_inode_info *i; |
410 | struct inode *inode = NULL; | |
411 | ||
412 | spin_lock(&sbi->inode_hash_lock); | |
b67bfe0d | 413 | hlist_for_each_entry(i, head, i_fat_hash) { |
1da177e4 LT |
414 | BUG_ON(i->vfs_inode.i_sb != sb); |
415 | if (i->i_pos != i_pos) | |
416 | continue; | |
417 | inode = igrab(&i->vfs_inode); | |
418 | if (inode) | |
419 | break; | |
420 | } | |
421 | spin_unlock(&sbi->inode_hash_lock); | |
422 | return inode; | |
423 | } | |
424 | ||
425 | static int is_exec(unsigned char *extension) | |
426 | { | |
ef19470e | 427 | unsigned char exe_extensions[] = "EXECOMBAT", *walk; |
1da177e4 LT |
428 | |
429 | for (walk = exe_extensions; *walk; walk += 3) | |
430 | if (!strncmp(extension, walk, 3)) | |
431 | return 1; | |
432 | return 0; | |
433 | } | |
434 | ||
435 | static int fat_calc_dir_size(struct inode *inode) | |
436 | { | |
437 | struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb); | |
438 | int ret, fclus, dclus; | |
439 | ||
440 | inode->i_size = 0; | |
441 | if (MSDOS_I(inode)->i_start == 0) | |
442 | return 0; | |
443 | ||
444 | ret = fat_get_cluster(inode, FAT_ENT_EOF, &fclus, &dclus); | |
445 | if (ret < 0) | |
446 | return ret; | |
447 | inode->i_size = (fclus + 1) << sbi->cluster_bits; | |
448 | ||
449 | return 0; | |
450 | } | |
451 | ||
a3082d52 OH |
452 | static int fat_validate_dir(struct inode *dir) |
453 | { | |
454 | struct super_block *sb = dir->i_sb; | |
455 | ||
456 | if (dir->i_nlink < 2) { | |
457 | /* Directory should have "."/".." entries at least. */ | |
458 | fat_fs_error(sb, "corrupted directory (invalid entries)"); | |
459 | return -EIO; | |
460 | } | |
461 | if (MSDOS_I(dir)->i_start == 0 || | |
462 | MSDOS_I(dir)->i_start == MSDOS_SB(sb)->root_cluster) { | |
463 | /* Directory should point valid cluster. */ | |
464 | fat_fs_error(sb, "corrupted directory (invalid i_start)"); | |
465 | return -EIO; | |
466 | } | |
467 | return 0; | |
468 | } | |
469 | ||
1da177e4 | 470 | /* doesn't deal with root inode */ |
f1e6fb0a | 471 | int fat_fill_inode(struct inode *inode, struct msdos_dir_entry *de) |
1da177e4 LT |
472 | { |
473 | struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb); | |
474 | int error; | |
475 | ||
476 | MSDOS_I(inode)->i_pos = 0; | |
477 | inode->i_uid = sbi->options.fs_uid; | |
478 | inode->i_gid = sbi->options.fs_gid; | |
479 | inode->i_version++; | |
480 | inode->i_generation = get_seconds(); | |
481 | ||
482 | if ((de->attr & ATTR_DIR) && !IS_FREE(de->name)) { | |
483 | inode->i_generation &= ~1; | |
9c0aa1b8 | 484 | inode->i_mode = fat_make_mode(sbi, de->attr, S_IRWXUGO); |
1da177e4 LT |
485 | inode->i_op = sbi->dir_ops; |
486 | inode->i_fop = &fat_dir_operations; | |
487 | ||
a943ed71 | 488 | MSDOS_I(inode)->i_start = fat_get_start(sbi, de); |
1da177e4 LT |
489 | MSDOS_I(inode)->i_logstart = MSDOS_I(inode)->i_start; |
490 | error = fat_calc_dir_size(inode); | |
491 | if (error < 0) | |
492 | return error; | |
493 | MSDOS_I(inode)->mmu_private = inode->i_size; | |
494 | ||
bfe86848 | 495 | set_nlink(inode, fat_subdirs(inode)); |
a3082d52 OH |
496 | |
497 | error = fat_validate_dir(inode); | |
498 | if (error < 0) | |
499 | return error; | |
1da177e4 LT |
500 | } else { /* not a directory */ |
501 | inode->i_generation |= 1; | |
9c0aa1b8 OH |
502 | inode->i_mode = fat_make_mode(sbi, de->attr, |
503 | ((sbi->options.showexec && !is_exec(de->name + 8)) | |
504 | ? S_IRUGO|S_IWUGO : S_IRWXUGO)); | |
a943ed71 | 505 | MSDOS_I(inode)->i_start = fat_get_start(sbi, de); |
1da177e4 LT |
506 | |
507 | MSDOS_I(inode)->i_logstart = MSDOS_I(inode)->i_start; | |
508 | inode->i_size = le32_to_cpu(de->size); | |
509 | inode->i_op = &fat_file_inode_operations; | |
510 | inode->i_fop = &fat_file_operations; | |
511 | inode->i_mapping->a_ops = &fat_aops; | |
512 | MSDOS_I(inode)->mmu_private = inode->i_size; | |
513 | } | |
514 | if (de->attr & ATTR_SYS) { | |
515 | if (sbi->options.sys_immutable) | |
516 | inode->i_flags |= S_IMMUTABLE; | |
517 | } | |
9c0aa1b8 OH |
518 | fat_save_attrs(inode, de->attr); |
519 | ||
1da177e4 LT |
520 | inode->i_blocks = ((inode->i_size + (sbi->cluster_size - 1)) |
521 | & ~((loff_t)sbi->cluster_size - 1)) >> 9; | |
7decd1cb OH |
522 | |
523 | fat_time_fat2unix(sbi, &inode->i_mtime, de->time, de->date, 0); | |
1da177e4 | 524 | if (sbi->options.isvfat) { |
7decd1cb OH |
525 | fat_time_fat2unix(sbi, &inode->i_ctime, de->ctime, |
526 | de->cdate, de->ctime_cs); | |
527 | fat_time_fat2unix(sbi, &inode->i_atime, 0, de->adate, 0); | |
1da177e4 | 528 | } else |
62a36c43 | 529 | inode->i_ctime = inode->i_atime = inode->i_mtime; |
1da177e4 LT |
530 | |
531 | return 0; | |
532 | } | |
533 | ||
8fceb4e0 NJ |
534 | static inline void fat_lock_build_inode(struct msdos_sb_info *sbi) |
535 | { | |
536 | if (sbi->options.nfs == FAT_NFS_NOSTALE_RO) | |
537 | mutex_lock(&sbi->nfs_build_inode_lock); | |
538 | } | |
539 | ||
540 | static inline void fat_unlock_build_inode(struct msdos_sb_info *sbi) | |
541 | { | |
542 | if (sbi->options.nfs == FAT_NFS_NOSTALE_RO) | |
543 | mutex_unlock(&sbi->nfs_build_inode_lock); | |
544 | } | |
545 | ||
1da177e4 LT |
546 | struct inode *fat_build_inode(struct super_block *sb, |
547 | struct msdos_dir_entry *de, loff_t i_pos) | |
548 | { | |
549 | struct inode *inode; | |
550 | int err; | |
551 | ||
8fceb4e0 | 552 | fat_lock_build_inode(MSDOS_SB(sb)); |
1da177e4 LT |
553 | inode = fat_iget(sb, i_pos); |
554 | if (inode) | |
555 | goto out; | |
556 | inode = new_inode(sb); | |
557 | if (!inode) { | |
558 | inode = ERR_PTR(-ENOMEM); | |
559 | goto out; | |
560 | } | |
561 | inode->i_ino = iunique(sb, MSDOS_ROOT_INO); | |
562 | inode->i_version = 1; | |
563 | err = fat_fill_inode(inode, de); | |
564 | if (err) { | |
565 | iput(inode); | |
566 | inode = ERR_PTR(err); | |
567 | goto out; | |
568 | } | |
569 | fat_attach(inode, i_pos); | |
570 | insert_inode_hash(inode); | |
571 | out: | |
8fceb4e0 | 572 | fat_unlock_build_inode(MSDOS_SB(sb)); |
1da177e4 LT |
573 | return inode; |
574 | } | |
575 | ||
7c709d00 | 576 | EXPORT_SYMBOL_GPL(fat_build_inode); |
1da177e4 | 577 | |
deee3ce4 | 578 | static void fat_evict_inode(struct inode *inode) |
1da177e4 | 579 | { |
91b0abe3 | 580 | truncate_inode_pages_final(&inode->i_data); |
deee3ce4 AV |
581 | if (!inode->i_nlink) { |
582 | inode->i_size = 0; | |
583 | fat_truncate_blocks(inode, 0); | |
584 | } | |
585 | invalidate_inode_buffers(inode); | |
dbd5768f | 586 | clear_inode(inode); |
1da177e4 | 587 | fat_cache_inval_inode(inode); |
a993b542 | 588 | fat_detach(inode); |
1da177e4 LT |
589 | } |
590 | ||
b88a1058 OR |
591 | static void fat_set_state(struct super_block *sb, |
592 | unsigned int set, unsigned int force) | |
593 | { | |
594 | struct buffer_head *bh; | |
595 | struct fat_boot_sector *b; | |
d6bd4282 | 596 | struct msdos_sb_info *sbi = MSDOS_SB(sb); |
b88a1058 OR |
597 | |
598 | /* do not change any thing if mounted read only */ | |
599 | if ((sb->s_flags & MS_RDONLY) && !force) | |
600 | return; | |
601 | ||
602 | /* do not change state if fs was dirty */ | |
603 | if (sbi->dirty) { | |
604 | /* warn only on set (mount). */ | |
605 | if (set) | |
606 | fat_msg(sb, KERN_WARNING, "Volume was not properly " | |
607 | "unmounted. Some data may be corrupt. " | |
608 | "Please run fsck."); | |
609 | return; | |
610 | } | |
611 | ||
612 | bh = sb_bread(sb, 0); | |
613 | if (bh == NULL) { | |
614 | fat_msg(sb, KERN_ERR, "unable to read boot sector " | |
615 | "to mark fs as dirty"); | |
616 | return; | |
617 | } | |
618 | ||
619 | b = (struct fat_boot_sector *) bh->b_data; | |
620 | ||
621 | if (sbi->fat_bits == 32) { | |
622 | if (set) | |
623 | b->fat32.state |= FAT_STATE_DIRTY; | |
624 | else | |
625 | b->fat32.state &= ~FAT_STATE_DIRTY; | |
626 | } else /* fat 16 and 12 */ { | |
627 | if (set) | |
628 | b->fat16.state |= FAT_STATE_DIRTY; | |
629 | else | |
630 | b->fat16.state &= ~FAT_STATE_DIRTY; | |
631 | } | |
632 | ||
633 | mark_buffer_dirty(bh); | |
634 | sync_dirty_buffer(bh); | |
635 | brelse(bh); | |
636 | } | |
637 | ||
cac45b06 AV |
638 | static void delayed_free(struct rcu_head *p) |
639 | { | |
640 | struct msdos_sb_info *sbi = container_of(p, struct msdos_sb_info, rcu); | |
641 | unload_nls(sbi->nls_disk); | |
642 | unload_nls(sbi->nls_io); | |
643 | if (sbi->options.iocharset != fat_default_iocharset) | |
644 | kfree(sbi->options.iocharset); | |
645 | kfree(sbi); | |
646 | } | |
647 | ||
a6bf6b21 OH |
648 | static void fat_put_super(struct super_block *sb) |
649 | { | |
650 | struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
1da177e4 | 651 | |
b88a1058 OR |
652 | fat_set_state(sb, 0, 0); |
653 | ||
020ac5b6 | 654 | iput(sbi->fsinfo_inode); |
b522412a AV |
655 | iput(sbi->fat_inode); |
656 | ||
cac45b06 | 657 | call_rcu(&sbi->rcu, delayed_free); |
1da177e4 LT |
658 | } |
659 | ||
e18b890b | 660 | static struct kmem_cache *fat_inode_cachep; |
1da177e4 LT |
661 | |
662 | static struct inode *fat_alloc_inode(struct super_block *sb) | |
663 | { | |
664 | struct msdos_inode_info *ei; | |
8f593427 | 665 | ei = kmem_cache_alloc(fat_inode_cachep, GFP_NOFS); |
1da177e4 LT |
666 | if (!ei) |
667 | return NULL; | |
58268691 CH |
668 | |
669 | init_rwsem(&ei->truncate_lock); | |
1da177e4 LT |
670 | return &ei->vfs_inode; |
671 | } | |
672 | ||
fa0d7e3d | 673 | static void fat_i_callback(struct rcu_head *head) |
1da177e4 | 674 | { |
fa0d7e3d | 675 | struct inode *inode = container_of(head, struct inode, i_rcu); |
1da177e4 LT |
676 | kmem_cache_free(fat_inode_cachep, MSDOS_I(inode)); |
677 | } | |
678 | ||
fa0d7e3d NP |
679 | static void fat_destroy_inode(struct inode *inode) |
680 | { | |
681 | call_rcu(&inode->i_rcu, fat_i_callback); | |
682 | } | |
683 | ||
51cc5068 | 684 | static void init_once(void *foo) |
1da177e4 LT |
685 | { |
686 | struct msdos_inode_info *ei = (struct msdos_inode_info *)foo; | |
687 | ||
a35afb83 CL |
688 | spin_lock_init(&ei->cache_lru_lock); |
689 | ei->nr_caches = 0; | |
690 | ei->cache_valid_id = FAT_CACHE_VALID + 1; | |
691 | INIT_LIST_HEAD(&ei->cache_lru); | |
692 | INIT_HLIST_NODE(&ei->i_fat_hash); | |
7669e8fb | 693 | INIT_HLIST_NODE(&ei->i_dir_hash); |
a35afb83 | 694 | inode_init_once(&ei->vfs_inode); |
1da177e4 LT |
695 | } |
696 | ||
697 | static int __init fat_init_inodecache(void) | |
698 | { | |
699 | fat_inode_cachep = kmem_cache_create("fat_inode_cache", | |
700 | sizeof(struct msdos_inode_info), | |
fffb60f9 | 701 | 0, (SLAB_RECLAIM_ACCOUNT| |
5d097056 | 702 | SLAB_MEM_SPREAD|SLAB_ACCOUNT), |
20c2df83 | 703 | init_once); |
1da177e4 LT |
704 | if (fat_inode_cachep == NULL) |
705 | return -ENOMEM; | |
706 | return 0; | |
707 | } | |
708 | ||
709 | static void __exit fat_destroy_inodecache(void) | |
710 | { | |
8c0a8537 KS |
711 | /* |
712 | * Make sure all delayed rcu free inodes are flushed before we | |
713 | * destroy cache. | |
714 | */ | |
715 | rcu_barrier(); | |
1a1d92c1 | 716 | kmem_cache_destroy(fat_inode_cachep); |
1da177e4 LT |
717 | } |
718 | ||
719 | static int fat_remount(struct super_block *sb, int *flags, char *data) | |
720 | { | |
b88a1058 | 721 | int new_rdonly; |
1da177e4 LT |
722 | struct msdos_sb_info *sbi = MSDOS_SB(sb); |
723 | *flags |= MS_NODIRATIME | (sbi->options.isvfat ? 0 : MS_NOATIME); | |
b88a1058 | 724 | |
02b9984d TT |
725 | sync_filesystem(sb); |
726 | ||
b88a1058 OR |
727 | /* make sure we update state on remount. */ |
728 | new_rdonly = *flags & MS_RDONLY; | |
729 | if (new_rdonly != (sb->s_flags & MS_RDONLY)) { | |
730 | if (new_rdonly) | |
731 | fat_set_state(sb, 0, 0); | |
732 | else | |
733 | fat_set_state(sb, 1, 1); | |
734 | } | |
1da177e4 LT |
735 | return 0; |
736 | } | |
737 | ||
726c3342 | 738 | static int fat_statfs(struct dentry *dentry, struct kstatfs *buf) |
1da177e4 | 739 | { |
aac49b75 CL |
740 | struct super_block *sb = dentry->d_sb; |
741 | struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
742 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); | |
1da177e4 LT |
743 | |
744 | /* If the count of free cluster is still unknown, counts it here. */ | |
606e423e | 745 | if (sbi->free_clusters == -1 || !sbi->free_clus_valid) { |
726c3342 | 746 | int err = fat_count_free_clusters(dentry->d_sb); |
1da177e4 LT |
747 | if (err) |
748 | return err; | |
749 | } | |
750 | ||
726c3342 | 751 | buf->f_type = dentry->d_sb->s_magic; |
1da177e4 LT |
752 | buf->f_bsize = sbi->cluster_size; |
753 | buf->f_blocks = sbi->max_cluster - FAT_START_ENT; | |
754 | buf->f_bfree = sbi->free_clusters; | |
755 | buf->f_bavail = sbi->free_clusters; | |
aac49b75 CL |
756 | buf->f_fsid.val[0] = (u32)id; |
757 | buf->f_fsid.val[1] = (u32)(id >> 32); | |
f68e542f OH |
758 | buf->f_namelen = |
759 | (sbi->options.isvfat ? FAT_LFN_LEN : 12) * NLS_MAX_CHARSET_SIZE; | |
1da177e4 LT |
760 | |
761 | return 0; | |
762 | } | |
763 | ||
a9185b41 | 764 | static int __fat_write_inode(struct inode *inode, int wait) |
1da177e4 LT |
765 | { |
766 | struct super_block *sb = inode->i_sb; | |
767 | struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
768 | struct buffer_head *bh; | |
769 | struct msdos_dir_entry *raw_entry; | |
770 | loff_t i_pos; | |
e22a4442 NJ |
771 | sector_t blocknr; |
772 | int err, offset; | |
1da177e4 | 773 | |
9ca59f4c OH |
774 | if (inode->i_ino == MSDOS_ROOT_INO) |
775 | return 0; | |
776 | ||
1da177e4 | 777 | retry: |
9ca59f4c OH |
778 | i_pos = fat_i_pos_read(sbi, inode); |
779 | if (!i_pos) | |
1da177e4 LT |
780 | return 0; |
781 | ||
e22a4442 NJ |
782 | fat_get_blknr_offset(sbi, i_pos, &blocknr, &offset); |
783 | bh = sb_bread(sb, blocknr); | |
1da177e4 | 784 | if (!bh) { |
869f58c0 AF |
785 | fat_msg(sb, KERN_ERR, "unable to read inode block " |
786 | "for updating (i_pos %lld)", i_pos); | |
5f22ca9b | 787 | return -EIO; |
1da177e4 LT |
788 | } |
789 | spin_lock(&sbi->inode_hash_lock); | |
790 | if (i_pos != MSDOS_I(inode)->i_pos) { | |
791 | spin_unlock(&sbi->inode_hash_lock); | |
792 | brelse(bh); | |
1da177e4 LT |
793 | goto retry; |
794 | } | |
795 | ||
e22a4442 | 796 | raw_entry = &((struct msdos_dir_entry *) (bh->b_data))[offset]; |
1da177e4 LT |
797 | if (S_ISDIR(inode->i_mode)) |
798 | raw_entry->size = 0; | |
799 | else | |
800 | raw_entry->size = cpu_to_le32(inode->i_size); | |
9c0aa1b8 | 801 | raw_entry->attr = fat_make_attrs(inode); |
a943ed71 | 802 | fat_set_start(raw_entry, MSDOS_I(inode)->i_logstart); |
7decd1cb OH |
803 | fat_time_unix2fat(sbi, &inode->i_mtime, &raw_entry->time, |
804 | &raw_entry->date, NULL); | |
1da177e4 | 805 | if (sbi->options.isvfat) { |
62a36c43 | 806 | __le16 atime; |
7decd1cb OH |
807 | fat_time_unix2fat(sbi, &inode->i_ctime, &raw_entry->ctime, |
808 | &raw_entry->cdate, &raw_entry->ctime_cs); | |
809 | fat_time_unix2fat(sbi, &inode->i_atime, &atime, | |
810 | &raw_entry->adate, NULL); | |
1da177e4 LT |
811 | } |
812 | spin_unlock(&sbi->inode_hash_lock); | |
813 | mark_buffer_dirty(bh); | |
5f22ca9b | 814 | err = 0; |
1da177e4 LT |
815 | if (wait) |
816 | err = sync_dirty_buffer(bh); | |
817 | brelse(bh); | |
1da177e4 LT |
818 | return err; |
819 | } | |
820 | ||
a9185b41 CH |
821 | static int fat_write_inode(struct inode *inode, struct writeback_control *wbc) |
822 | { | |
78491189 AB |
823 | int err; |
824 | ||
825 | if (inode->i_ino == MSDOS_FSINFO_INO) { | |
826 | struct super_block *sb = inode->i_sb; | |
827 | ||
e40b34c7 | 828 | mutex_lock(&MSDOS_SB(sb)->s_lock); |
78491189 | 829 | err = fat_clusters_flush(sb); |
e40b34c7 | 830 | mutex_unlock(&MSDOS_SB(sb)->s_lock); |
78491189 AB |
831 | } else |
832 | err = __fat_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL); | |
833 | ||
834 | return err; | |
a9185b41 CH |
835 | } |
836 | ||
1da177e4 LT |
837 | int fat_sync_inode(struct inode *inode) |
838 | { | |
a9185b41 | 839 | return __fat_write_inode(inode, 1); |
1da177e4 LT |
840 | } |
841 | ||
7c709d00 | 842 | EXPORT_SYMBOL_GPL(fat_sync_inode); |
1da177e4 | 843 | |
34c80b1d | 844 | static int fat_show_options(struct seq_file *m, struct dentry *root); |
ee9b6d61 | 845 | static const struct super_operations fat_sops = { |
1da177e4 LT |
846 | .alloc_inode = fat_alloc_inode, |
847 | .destroy_inode = fat_destroy_inode, | |
848 | .write_inode = fat_write_inode, | |
deee3ce4 | 849 | .evict_inode = fat_evict_inode, |
1da177e4 LT |
850 | .put_super = fat_put_super, |
851 | .statfs = fat_statfs, | |
1da177e4 LT |
852 | .remount_fs = fat_remount, |
853 | ||
1da177e4 LT |
854 | .show_options = fat_show_options, |
855 | }; | |
856 | ||
34c80b1d | 857 | static int fat_show_options(struct seq_file *m, struct dentry *root) |
1da177e4 | 858 | { |
34c80b1d | 859 | struct msdos_sb_info *sbi = MSDOS_SB(root->d_sb); |
1da177e4 LT |
860 | struct fat_mount_options *opts = &sbi->options; |
861 | int isvfat = opts->isvfat; | |
862 | ||
170782eb EB |
863 | if (!uid_eq(opts->fs_uid, GLOBAL_ROOT_UID)) |
864 | seq_printf(m, ",uid=%u", | |
865 | from_kuid_munged(&init_user_ns, opts->fs_uid)); | |
866 | if (!gid_eq(opts->fs_gid, GLOBAL_ROOT_GID)) | |
867 | seq_printf(m, ",gid=%u", | |
868 | from_kgid_munged(&init_user_ns, opts->fs_gid)); | |
1da177e4 LT |
869 | seq_printf(m, ",fmask=%04o", opts->fs_fmask); |
870 | seq_printf(m, ",dmask=%04o", opts->fs_dmask); | |
1ae43f82 OH |
871 | if (opts->allow_utime) |
872 | seq_printf(m, ",allow_utime=%04o", opts->allow_utime); | |
1da177e4 | 873 | if (sbi->nls_disk) |
c6c20372 DR |
874 | /* strip "cp" prefix from displayed option */ |
875 | seq_printf(m, ",codepage=%s", &sbi->nls_disk->charset[2]); | |
1da177e4 LT |
876 | if (isvfat) { |
877 | if (sbi->nls_io) | |
878 | seq_printf(m, ",iocharset=%s", sbi->nls_io->charset); | |
879 | ||
880 | switch (opts->shortname) { | |
881 | case VFAT_SFN_DISPLAY_WIN95 | VFAT_SFN_CREATE_WIN95: | |
882 | seq_puts(m, ",shortname=win95"); | |
883 | break; | |
884 | case VFAT_SFN_DISPLAY_WINNT | VFAT_SFN_CREATE_WINNT: | |
885 | seq_puts(m, ",shortname=winnt"); | |
886 | break; | |
887 | case VFAT_SFN_DISPLAY_WINNT | VFAT_SFN_CREATE_WIN95: | |
888 | seq_puts(m, ",shortname=mixed"); | |
889 | break; | |
890 | case VFAT_SFN_DISPLAY_LOWER | VFAT_SFN_CREATE_WIN95: | |
95523475 | 891 | seq_puts(m, ",shortname=lower"); |
1da177e4 LT |
892 | break; |
893 | default: | |
894 | seq_puts(m, ",shortname=unknown"); | |
895 | break; | |
896 | } | |
897 | } | |
898 | if (opts->name_check != 'n') | |
899 | seq_printf(m, ",check=%c", opts->name_check); | |
28ec039c OH |
900 | if (opts->usefree) |
901 | seq_puts(m, ",usefree"); | |
1da177e4 LT |
902 | if (opts->quiet) |
903 | seq_puts(m, ",quiet"); | |
904 | if (opts->showexec) | |
905 | seq_puts(m, ",showexec"); | |
906 | if (opts->sys_immutable) | |
907 | seq_puts(m, ",sys_immutable"); | |
908 | if (!isvfat) { | |
909 | if (opts->dotsOK) | |
910 | seq_puts(m, ",dotsOK=yes"); | |
911 | if (opts->nocase) | |
912 | seq_puts(m, ",nocase"); | |
913 | } else { | |
914 | if (opts->utf8) | |
915 | seq_puts(m, ",utf8"); | |
916 | if (opts->unicode_xlate) | |
917 | seq_puts(m, ",uni_xlate"); | |
918 | if (!opts->numtail) | |
919 | seq_puts(m, ",nonumtail"); | |
dfc209c0 OH |
920 | if (opts->rodir) |
921 | seq_puts(m, ",rodir"); | |
1da177e4 | 922 | } |
dfc209c0 | 923 | if (opts->flush) |
c1fca3b6 | 924 | seq_puts(m, ",flush"); |
58156c8f JK |
925 | if (opts->tz_set) { |
926 | if (opts->time_offset) | |
927 | seq_printf(m, ",time_offset=%d", opts->time_offset); | |
928 | else | |
929 | seq_puts(m, ",tz=UTC"); | |
930 | } | |
85c78591 DK |
931 | if (opts->errors == FAT_ERRORS_CONT) |
932 | seq_puts(m, ",errors=continue"); | |
933 | else if (opts->errors == FAT_ERRORS_PANIC) | |
934 | seq_puts(m, ",errors=panic"); | |
935 | else | |
936 | seq_puts(m, ",errors=remount-ro"); | |
2628b7a6 NJ |
937 | if (opts->nfs == FAT_NFS_NOSTALE_RO) |
938 | seq_puts(m, ",nfs=nostale_ro"); | |
939 | else if (opts->nfs) | |
940 | seq_puts(m, ",nfs=stale_rw"); | |
681142f9 CH |
941 | if (opts->discard) |
942 | seq_puts(m, ",discard"); | |
190a8843 CM |
943 | if (opts->dos1xfloppy) |
944 | seq_puts(m, ",dos1xfloppy"); | |
1da177e4 LT |
945 | |
946 | return 0; | |
947 | } | |
948 | ||
949 | enum { | |
950 | Opt_check_n, Opt_check_r, Opt_check_s, Opt_uid, Opt_gid, | |
1ae43f82 OH |
951 | Opt_umask, Opt_dmask, Opt_fmask, Opt_allow_utime, Opt_codepage, |
952 | Opt_usefree, Opt_nocase, Opt_quiet, Opt_showexec, Opt_debug, | |
953 | Opt_immutable, Opt_dots, Opt_nodots, | |
1da177e4 LT |
954 | Opt_charset, Opt_shortname_lower, Opt_shortname_win95, |
955 | Opt_shortname_winnt, Opt_shortname_mixed, Opt_utf8_no, Opt_utf8_yes, | |
956 | Opt_uni_xl_no, Opt_uni_xl_yes, Opt_nonumtail_no, Opt_nonumtail_yes, | |
d7a83c0f | 957 | Opt_obsolete, Opt_flush, Opt_tz_utc, Opt_rodir, Opt_err_cont, |
58156c8f | 958 | Opt_err_panic, Opt_err_ro, Opt_discard, Opt_nfs, Opt_time_offset, |
190a8843 | 959 | Opt_nfs_stale_rw, Opt_nfs_nostale_ro, Opt_err, Opt_dos1xfloppy, |
1da177e4 LT |
960 | }; |
961 | ||
a447c093 | 962 | static const match_table_t fat_tokens = { |
1da177e4 LT |
963 | {Opt_check_r, "check=relaxed"}, |
964 | {Opt_check_s, "check=strict"}, | |
965 | {Opt_check_n, "check=normal"}, | |
966 | {Opt_check_r, "check=r"}, | |
967 | {Opt_check_s, "check=s"}, | |
968 | {Opt_check_n, "check=n"}, | |
969 | {Opt_uid, "uid=%u"}, | |
970 | {Opt_gid, "gid=%u"}, | |
971 | {Opt_umask, "umask=%o"}, | |
972 | {Opt_dmask, "dmask=%o"}, | |
973 | {Opt_fmask, "fmask=%o"}, | |
1ae43f82 | 974 | {Opt_allow_utime, "allow_utime=%o"}, |
1da177e4 | 975 | {Opt_codepage, "codepage=%u"}, |
28ec039c | 976 | {Opt_usefree, "usefree"}, |
1da177e4 LT |
977 | {Opt_nocase, "nocase"}, |
978 | {Opt_quiet, "quiet"}, | |
979 | {Opt_showexec, "showexec"}, | |
980 | {Opt_debug, "debug"}, | |
981 | {Opt_immutable, "sys_immutable"}, | |
85c78591 DK |
982 | {Opt_flush, "flush"}, |
983 | {Opt_tz_utc, "tz=UTC"}, | |
58156c8f | 984 | {Opt_time_offset, "time_offset=%d"}, |
85c78591 DK |
985 | {Opt_err_cont, "errors=continue"}, |
986 | {Opt_err_panic, "errors=panic"}, | |
987 | {Opt_err_ro, "errors=remount-ro"}, | |
681142f9 | 988 | {Opt_discard, "discard"}, |
2628b7a6 NJ |
989 | {Opt_nfs_stale_rw, "nfs"}, |
990 | {Opt_nfs_stale_rw, "nfs=stale_rw"}, | |
991 | {Opt_nfs_nostale_ro, "nfs=nostale_ro"}, | |
190a8843 | 992 | {Opt_dos1xfloppy, "dos1xfloppy"}, |
d7a83c0f GU |
993 | {Opt_obsolete, "conv=binary"}, |
994 | {Opt_obsolete, "conv=text"}, | |
995 | {Opt_obsolete, "conv=auto"}, | |
996 | {Opt_obsolete, "conv=b"}, | |
997 | {Opt_obsolete, "conv=t"}, | |
998 | {Opt_obsolete, "conv=a"}, | |
999 | {Opt_obsolete, "fat=%u"}, | |
1000 | {Opt_obsolete, "blocksize=%u"}, | |
1001 | {Opt_obsolete, "cvf_format=%20s"}, | |
1002 | {Opt_obsolete, "cvf_options=%100s"}, | |
1003 | {Opt_obsolete, "posix"}, | |
ae78bf9c | 1004 | {Opt_err, NULL}, |
1da177e4 | 1005 | }; |
a447c093 | 1006 | static const match_table_t msdos_tokens = { |
1da177e4 LT |
1007 | {Opt_nodots, "nodots"}, |
1008 | {Opt_nodots, "dotsOK=no"}, | |
1009 | {Opt_dots, "dots"}, | |
1010 | {Opt_dots, "dotsOK=yes"}, | |
1011 | {Opt_err, NULL} | |
1012 | }; | |
a447c093 | 1013 | static const match_table_t vfat_tokens = { |
1da177e4 LT |
1014 | {Opt_charset, "iocharset=%s"}, |
1015 | {Opt_shortname_lower, "shortname=lower"}, | |
1016 | {Opt_shortname_win95, "shortname=win95"}, | |
1017 | {Opt_shortname_winnt, "shortname=winnt"}, | |
1018 | {Opt_shortname_mixed, "shortname=mixed"}, | |
1019 | {Opt_utf8_no, "utf8=0"}, /* 0 or no or false */ | |
1020 | {Opt_utf8_no, "utf8=no"}, | |
1021 | {Opt_utf8_no, "utf8=false"}, | |
1022 | {Opt_utf8_yes, "utf8=1"}, /* empty or 1 or yes or true */ | |
1023 | {Opt_utf8_yes, "utf8=yes"}, | |
1024 | {Opt_utf8_yes, "utf8=true"}, | |
1025 | {Opt_utf8_yes, "utf8"}, | |
1026 | {Opt_uni_xl_no, "uni_xlate=0"}, /* 0 or no or false */ | |
1027 | {Opt_uni_xl_no, "uni_xlate=no"}, | |
1028 | {Opt_uni_xl_no, "uni_xlate=false"}, | |
1029 | {Opt_uni_xl_yes, "uni_xlate=1"}, /* empty or 1 or yes or true */ | |
1030 | {Opt_uni_xl_yes, "uni_xlate=yes"}, | |
1031 | {Opt_uni_xl_yes, "uni_xlate=true"}, | |
1032 | {Opt_uni_xl_yes, "uni_xlate"}, | |
1033 | {Opt_nonumtail_no, "nonumtail=0"}, /* 0 or no or false */ | |
1034 | {Opt_nonumtail_no, "nonumtail=no"}, | |
1035 | {Opt_nonumtail_no, "nonumtail=false"}, | |
1036 | {Opt_nonumtail_yes, "nonumtail=1"}, /* empty or 1 or yes or true */ | |
1037 | {Opt_nonumtail_yes, "nonumtail=yes"}, | |
1038 | {Opt_nonumtail_yes, "nonumtail=true"}, | |
1039 | {Opt_nonumtail_yes, "nonumtail"}, | |
dfc209c0 | 1040 | {Opt_rodir, "rodir"}, |
1da177e4 LT |
1041 | {Opt_err, NULL} |
1042 | }; | |
1043 | ||
869f58c0 AF |
1044 | static int parse_options(struct super_block *sb, char *options, int is_vfat, |
1045 | int silent, int *debug, struct fat_mount_options *opts) | |
1da177e4 LT |
1046 | { |
1047 | char *p; | |
1048 | substring_t args[MAX_OPT_ARGS]; | |
1049 | int option; | |
1050 | char *iocharset; | |
1051 | ||
1052 | opts->isvfat = is_vfat; | |
1053 | ||
f0ce7ee3 DH |
1054 | opts->fs_uid = current_uid(); |
1055 | opts->fs_gid = current_gid(); | |
3e107603 | 1056 | opts->fs_fmask = opts->fs_dmask = current_umask(); |
1ae43f82 | 1057 | opts->allow_utime = -1; |
1da177e4 LT |
1058 | opts->codepage = fat_default_codepage; |
1059 | opts->iocharset = fat_default_iocharset; | |
dfc209c0 | 1060 | if (is_vfat) { |
95523475 | 1061 | opts->shortname = VFAT_SFN_DISPLAY_WINNT|VFAT_SFN_CREATE_WIN95; |
dfc209c0 OH |
1062 | opts->rodir = 0; |
1063 | } else { | |
1da177e4 | 1064 | opts->shortname = 0; |
dfc209c0 OH |
1065 | opts->rodir = 1; |
1066 | } | |
1da177e4 LT |
1067 | opts->name_check = 'n'; |
1068 | opts->quiet = opts->showexec = opts->sys_immutable = opts->dotsOK = 0; | |
1069 | opts->utf8 = opts->unicode_xlate = 0; | |
1070 | opts->numtail = 1; | |
28ec039c | 1071 | opts->usefree = opts->nocase = 0; |
58156c8f | 1072 | opts->tz_set = 0; |
7669e8fb | 1073 | opts->nfs = 0; |
85c78591 | 1074 | opts->errors = FAT_ERRORS_RO; |
1da177e4 LT |
1075 | *debug = 0; |
1076 | ||
1077 | if (!options) | |
8d44d974 | 1078 | goto out; |
1da177e4 LT |
1079 | |
1080 | while ((p = strsep(&options, ",")) != NULL) { | |
1081 | int token; | |
1082 | if (!*p) | |
1083 | continue; | |
1084 | ||
1085 | token = match_token(p, fat_tokens, args); | |
1086 | if (token == Opt_err) { | |
1087 | if (is_vfat) | |
1088 | token = match_token(p, vfat_tokens, args); | |
1089 | else | |
1090 | token = match_token(p, msdos_tokens, args); | |
1091 | } | |
1092 | switch (token) { | |
1093 | case Opt_check_s: | |
1094 | opts->name_check = 's'; | |
1095 | break; | |
1096 | case Opt_check_r: | |
1097 | opts->name_check = 'r'; | |
1098 | break; | |
1099 | case Opt_check_n: | |
1100 | opts->name_check = 'n'; | |
1101 | break; | |
28ec039c OH |
1102 | case Opt_usefree: |
1103 | opts->usefree = 1; | |
1104 | break; | |
1da177e4 LT |
1105 | case Opt_nocase: |
1106 | if (!is_vfat) | |
1107 | opts->nocase = 1; | |
1108 | else { | |
1109 | /* for backward compatibility */ | |
1110 | opts->shortname = VFAT_SFN_DISPLAY_WIN95 | |
1111 | | VFAT_SFN_CREATE_WIN95; | |
1112 | } | |
1113 | break; | |
1114 | case Opt_quiet: | |
1115 | opts->quiet = 1; | |
1116 | break; | |
1117 | case Opt_showexec: | |
1118 | opts->showexec = 1; | |
1119 | break; | |
1120 | case Opt_debug: | |
1121 | *debug = 1; | |
1122 | break; | |
1123 | case Opt_immutable: | |
1124 | opts->sys_immutable = 1; | |
1125 | break; | |
1126 | case Opt_uid: | |
1127 | if (match_int(&args[0], &option)) | |
5b3d5aea | 1128 | return -EINVAL; |
170782eb EB |
1129 | opts->fs_uid = make_kuid(current_user_ns(), option); |
1130 | if (!uid_valid(opts->fs_uid)) | |
5b3d5aea | 1131 | return -EINVAL; |
1da177e4 LT |
1132 | break; |
1133 | case Opt_gid: | |
1134 | if (match_int(&args[0], &option)) | |
5b3d5aea | 1135 | return -EINVAL; |
170782eb EB |
1136 | opts->fs_gid = make_kgid(current_user_ns(), option); |
1137 | if (!gid_valid(opts->fs_gid)) | |
5b3d5aea | 1138 | return -EINVAL; |
1da177e4 LT |
1139 | break; |
1140 | case Opt_umask: | |
1141 | if (match_octal(&args[0], &option)) | |
5b3d5aea | 1142 | return -EINVAL; |
1da177e4 LT |
1143 | opts->fs_fmask = opts->fs_dmask = option; |
1144 | break; | |
1145 | case Opt_dmask: | |
1146 | if (match_octal(&args[0], &option)) | |
5b3d5aea | 1147 | return -EINVAL; |
1da177e4 LT |
1148 | opts->fs_dmask = option; |
1149 | break; | |
1150 | case Opt_fmask: | |
1151 | if (match_octal(&args[0], &option)) | |
5b3d5aea | 1152 | return -EINVAL; |
1da177e4 LT |
1153 | opts->fs_fmask = option; |
1154 | break; | |
1ae43f82 OH |
1155 | case Opt_allow_utime: |
1156 | if (match_octal(&args[0], &option)) | |
5b3d5aea | 1157 | return -EINVAL; |
1ae43f82 OH |
1158 | opts->allow_utime = option & (S_IWGRP | S_IWOTH); |
1159 | break; | |
1da177e4 LT |
1160 | case Opt_codepage: |
1161 | if (match_int(&args[0], &option)) | |
5b3d5aea | 1162 | return -EINVAL; |
1da177e4 LT |
1163 | opts->codepage = option; |
1164 | break; | |
ae78bf9c CM |
1165 | case Opt_flush: |
1166 | opts->flush = 1; | |
1167 | break; | |
58156c8f JK |
1168 | case Opt_time_offset: |
1169 | if (match_int(&args[0], &option)) | |
5b3d5aea | 1170 | return -EINVAL; |
a513d869 JK |
1171 | /* |
1172 | * GMT+-12 zones may have DST corrections so at least | |
1173 | * 13 hours difference is needed. Make the limit 24 | |
1174 | * just in case someone invents something unusual. | |
1175 | */ | |
1176 | if (option < -24 * 60 || option > 24 * 60) | |
5b3d5aea | 1177 | return -EINVAL; |
58156c8f JK |
1178 | opts->tz_set = 1; |
1179 | opts->time_offset = option; | |
1180 | break; | |
b271e067 | 1181 | case Opt_tz_utc: |
58156c8f JK |
1182 | opts->tz_set = 1; |
1183 | opts->time_offset = 0; | |
b271e067 | 1184 | break; |
85c78591 DK |
1185 | case Opt_err_cont: |
1186 | opts->errors = FAT_ERRORS_CONT; | |
1187 | break; | |
1188 | case Opt_err_panic: | |
1189 | opts->errors = FAT_ERRORS_PANIC; | |
1190 | break; | |
1191 | case Opt_err_ro: | |
1192 | opts->errors = FAT_ERRORS_RO; | |
1193 | break; | |
2628b7a6 NJ |
1194 | case Opt_nfs_stale_rw: |
1195 | opts->nfs = FAT_NFS_STALE_RW; | |
1196 | break; | |
1197 | case Opt_nfs_nostale_ro: | |
1198 | opts->nfs = FAT_NFS_NOSTALE_RO; | |
1199 | break; | |
190a8843 CM |
1200 | case Opt_dos1xfloppy: |
1201 | opts->dos1xfloppy = 1; | |
1202 | break; | |
1da177e4 LT |
1203 | |
1204 | /* msdos specific */ | |
1205 | case Opt_dots: | |
1206 | opts->dotsOK = 1; | |
1207 | break; | |
1208 | case Opt_nodots: | |
1209 | opts->dotsOK = 0; | |
1210 | break; | |
1211 | ||
1212 | /* vfat specific */ | |
1213 | case Opt_charset: | |
1214 | if (opts->iocharset != fat_default_iocharset) | |
1215 | kfree(opts->iocharset); | |
1216 | iocharset = match_strdup(&args[0]); | |
1217 | if (!iocharset) | |
1218 | return -ENOMEM; | |
1219 | opts->iocharset = iocharset; | |
1220 | break; | |
1221 | case Opt_shortname_lower: | |
1222 | opts->shortname = VFAT_SFN_DISPLAY_LOWER | |
1223 | | VFAT_SFN_CREATE_WIN95; | |
1224 | break; | |
1225 | case Opt_shortname_win95: | |
1226 | opts->shortname = VFAT_SFN_DISPLAY_WIN95 | |
1227 | | VFAT_SFN_CREATE_WIN95; | |
1228 | break; | |
1229 | case Opt_shortname_winnt: | |
1230 | opts->shortname = VFAT_SFN_DISPLAY_WINNT | |
1231 | | VFAT_SFN_CREATE_WINNT; | |
1232 | break; | |
1233 | case Opt_shortname_mixed: | |
1234 | opts->shortname = VFAT_SFN_DISPLAY_WINNT | |
1235 | | VFAT_SFN_CREATE_WIN95; | |
1236 | break; | |
1237 | case Opt_utf8_no: /* 0 or no or false */ | |
1238 | opts->utf8 = 0; | |
1239 | break; | |
1240 | case Opt_utf8_yes: /* empty or 1 or yes or true */ | |
1241 | opts->utf8 = 1; | |
1242 | break; | |
1243 | case Opt_uni_xl_no: /* 0 or no or false */ | |
1244 | opts->unicode_xlate = 0; | |
1245 | break; | |
1246 | case Opt_uni_xl_yes: /* empty or 1 or yes or true */ | |
1247 | opts->unicode_xlate = 1; | |
1248 | break; | |
1249 | case Opt_nonumtail_no: /* 0 or no or false */ | |
1250 | opts->numtail = 1; /* negated option */ | |
1251 | break; | |
1252 | case Opt_nonumtail_yes: /* empty or 1 or yes or true */ | |
1253 | opts->numtail = 0; /* negated option */ | |
1254 | break; | |
dfc209c0 OH |
1255 | case Opt_rodir: |
1256 | opts->rodir = 1; | |
1257 | break; | |
681142f9 CH |
1258 | case Opt_discard: |
1259 | opts->discard = 1; | |
1260 | break; | |
1da177e4 LT |
1261 | |
1262 | /* obsolete mount options */ | |
d7a83c0f | 1263 | case Opt_obsolete: |
869f58c0 AF |
1264 | fat_msg(sb, KERN_INFO, "\"%s\" option is obsolete, " |
1265 | "not supported now", p); | |
1da177e4 LT |
1266 | break; |
1267 | /* unknown option */ | |
1268 | default: | |
41a34a4f | 1269 | if (!silent) { |
869f58c0 AF |
1270 | fat_msg(sb, KERN_ERR, |
1271 | "Unrecognized mount option \"%s\" " | |
1272 | "or missing value", p); | |
41a34a4f | 1273 | } |
1da177e4 LT |
1274 | return -EINVAL; |
1275 | } | |
1276 | } | |
8d44d974 OH |
1277 | |
1278 | out: | |
4de151d8 | 1279 | /* UTF-8 doesn't provide FAT semantics */ |
1da177e4 | 1280 | if (!strcmp(opts->iocharset, "utf8")) { |
186b5370 | 1281 | fat_msg(sb, KERN_WARNING, "utf8 is not a recommended IO charset" |
8d44d974 | 1282 | " for FAT filesystems, filesystem will be " |
186b5370 | 1283 | "case sensitive!"); |
1da177e4 LT |
1284 | } |
1285 | ||
1ae43f82 OH |
1286 | /* If user doesn't specify allow_utime, it's initialized from dmask. */ |
1287 | if (opts->allow_utime == (unsigned short)-1) | |
1288 | opts->allow_utime = ~opts->fs_dmask & (S_IWGRP | S_IWOTH); | |
1da177e4 LT |
1289 | if (opts->unicode_xlate) |
1290 | opts->utf8 = 0; | |
ea3983ac | 1291 | if (opts->nfs == FAT_NFS_NOSTALE_RO) { |
2628b7a6 | 1292 | sb->s_flags |= MS_RDONLY; |
ea3983ac NJ |
1293 | sb->s_export_op = &fat_export_ops_nostale; |
1294 | } | |
1da177e4 LT |
1295 | |
1296 | return 0; | |
1297 | } | |
1298 | ||
1299 | static int fat_read_root(struct inode *inode) | |
1300 | { | |
a40a7d9d | 1301 | struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb); |
1da177e4 LT |
1302 | int error; |
1303 | ||
ea3983ac | 1304 | MSDOS_I(inode)->i_pos = MSDOS_ROOT_INO; |
1da177e4 LT |
1305 | inode->i_uid = sbi->options.fs_uid; |
1306 | inode->i_gid = sbi->options.fs_gid; | |
1307 | inode->i_version++; | |
1308 | inode->i_generation = 0; | |
9c0aa1b8 | 1309 | inode->i_mode = fat_make_mode(sbi, ATTR_DIR, S_IRWXUGO); |
1da177e4 LT |
1310 | inode->i_op = sbi->dir_ops; |
1311 | inode->i_fop = &fat_dir_operations; | |
1312 | if (sbi->fat_bits == 32) { | |
1313 | MSDOS_I(inode)->i_start = sbi->root_cluster; | |
1314 | error = fat_calc_dir_size(inode); | |
1315 | if (error < 0) | |
1316 | return error; | |
1317 | } else { | |
1318 | MSDOS_I(inode)->i_start = 0; | |
1319 | inode->i_size = sbi->dir_entries * sizeof(struct msdos_dir_entry); | |
1320 | } | |
1da177e4 LT |
1321 | inode->i_blocks = ((inode->i_size + (sbi->cluster_size - 1)) |
1322 | & ~((loff_t)sbi->cluster_size - 1)) >> 9; | |
1323 | MSDOS_I(inode)->i_logstart = 0; | |
1324 | MSDOS_I(inode)->mmu_private = inode->i_size; | |
1325 | ||
9c0aa1b8 | 1326 | fat_save_attrs(inode, ATTR_DIR); |
1da177e4 LT |
1327 | inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = 0; |
1328 | inode->i_mtime.tv_nsec = inode->i_atime.tv_nsec = inode->i_ctime.tv_nsec = 0; | |
bfe86848 | 1329 | set_nlink(inode, fat_subdirs(inode)+2); |
1da177e4 LT |
1330 | |
1331 | return 0; | |
1332 | } | |
1333 | ||
7b92d03c OH |
1334 | static unsigned long calc_fat_clusters(struct super_block *sb) |
1335 | { | |
1336 | struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
1337 | ||
1338 | /* Divide first to avoid overflow */ | |
1339 | if (sbi->fat_bits != 12) { | |
1340 | unsigned long ent_per_sec = sb->s_blocksize * 8 / sbi->fat_bits; | |
1341 | return ent_per_sec * sbi->fat_length; | |
1342 | } | |
1343 | ||
1344 | return sbi->fat_length * sb->s_blocksize * 8 / sbi->fat_bits; | |
1345 | } | |
1346 | ||
190a8843 CM |
1347 | static bool fat_bpb_is_zero(struct fat_boot_sector *b) |
1348 | { | |
1349 | if (get_unaligned_le16(&b->sector_size)) | |
1350 | return false; | |
1351 | if (b->sec_per_clus) | |
1352 | return false; | |
1353 | if (b->reserved) | |
1354 | return false; | |
1355 | if (b->fats) | |
1356 | return false; | |
1357 | if (get_unaligned_le16(&b->dir_entries)) | |
1358 | return false; | |
1359 | if (get_unaligned_le16(&b->sectors)) | |
1360 | return false; | |
1361 | if (b->media) | |
1362 | return false; | |
1363 | if (b->fat_length) | |
1364 | return false; | |
1365 | if (b->secs_track) | |
1366 | return false; | |
1367 | if (b->heads) | |
1368 | return false; | |
1369 | return true; | |
1370 | } | |
1371 | ||
1372 | static int fat_read_bpb(struct super_block *sb, struct fat_boot_sector *b, | |
1373 | int silent, struct fat_bios_param_block *bpb) | |
1374 | { | |
1375 | int error = -EINVAL; | |
1376 | ||
1377 | /* Read in BPB ... */ | |
1378 | memset(bpb, 0, sizeof(*bpb)); | |
1379 | bpb->fat_sector_size = get_unaligned_le16(&b->sector_size); | |
1380 | bpb->fat_sec_per_clus = b->sec_per_clus; | |
1381 | bpb->fat_reserved = le16_to_cpu(b->reserved); | |
1382 | bpb->fat_fats = b->fats; | |
1383 | bpb->fat_dir_entries = get_unaligned_le16(&b->dir_entries); | |
1384 | bpb->fat_sectors = get_unaligned_le16(&b->sectors); | |
1385 | bpb->fat_fat_length = le16_to_cpu(b->fat_length); | |
1386 | bpb->fat_total_sect = le32_to_cpu(b->total_sect); | |
1387 | ||
1388 | bpb->fat16_state = b->fat16.state; | |
1389 | bpb->fat16_vol_id = get_unaligned_le32(b->fat16.vol_id); | |
1390 | ||
1391 | bpb->fat32_length = le32_to_cpu(b->fat32.length); | |
1392 | bpb->fat32_root_cluster = le32_to_cpu(b->fat32.root_cluster); | |
1393 | bpb->fat32_info_sector = le16_to_cpu(b->fat32.info_sector); | |
1394 | bpb->fat32_state = b->fat32.state; | |
1395 | bpb->fat32_vol_id = get_unaligned_le32(b->fat32.vol_id); | |
1396 | ||
1397 | /* Validate this looks like a FAT filesystem BPB */ | |
1398 | if (!bpb->fat_reserved) { | |
1399 | if (!silent) | |
1400 | fat_msg(sb, KERN_ERR, | |
1401 | "bogus number of reserved sectors"); | |
1402 | goto out; | |
1403 | } | |
1404 | if (!bpb->fat_fats) { | |
1405 | if (!silent) | |
1406 | fat_msg(sb, KERN_ERR, "bogus number of FAT structure"); | |
1407 | goto out; | |
1408 | } | |
1409 | ||
1410 | /* | |
1411 | * Earlier we checked here that b->secs_track and b->head are nonzero, | |
1412 | * but it turns out valid FAT filesystems can have zero there. | |
1413 | */ | |
1414 | ||
1415 | if (!fat_valid_media(b->media)) { | |
1416 | if (!silent) | |
1417 | fat_msg(sb, KERN_ERR, "invalid media value (0x%02x)", | |
1418 | (unsigned)b->media); | |
1419 | goto out; | |
1420 | } | |
1421 | ||
1422 | if (!is_power_of_2(bpb->fat_sector_size) | |
1423 | || (bpb->fat_sector_size < 512) | |
1424 | || (bpb->fat_sector_size > 4096)) { | |
1425 | if (!silent) | |
1426 | fat_msg(sb, KERN_ERR, "bogus logical sector size %u", | |
1427 | (unsigned)bpb->fat_sector_size); | |
1428 | goto out; | |
1429 | } | |
1430 | ||
1431 | if (!is_power_of_2(bpb->fat_sec_per_clus)) { | |
1432 | if (!silent) | |
1433 | fat_msg(sb, KERN_ERR, "bogus sectors per cluster %u", | |
1434 | (unsigned)bpb->fat_sec_per_clus); | |
1435 | goto out; | |
1436 | } | |
1437 | ||
1438 | error = 0; | |
1439 | ||
1440 | out: | |
1441 | return error; | |
1442 | } | |
1443 | ||
1444 | static int fat_read_static_bpb(struct super_block *sb, | |
1445 | struct fat_boot_sector *b, int silent, | |
1446 | struct fat_bios_param_block *bpb) | |
1447 | { | |
1448 | static const char *notdos1x = "This doesn't look like a DOS 1.x volume"; | |
1449 | ||
1450 | struct fat_floppy_defaults *fdefaults = NULL; | |
1451 | int error = -EINVAL; | |
1452 | sector_t bd_sects; | |
1453 | unsigned i; | |
1454 | ||
1455 | bd_sects = i_size_read(sb->s_bdev->bd_inode) / SECTOR_SIZE; | |
1456 | ||
1457 | /* 16-bit DOS 1.x reliably wrote bootstrap short-jmp code */ | |
1458 | if (b->ignored[0] != 0xeb || b->ignored[2] != 0x90) { | |
1459 | if (!silent) | |
1460 | fat_msg(sb, KERN_ERR, | |
1461 | "%s; no bootstrapping code", notdos1x); | |
1462 | goto out; | |
1463 | } | |
1464 | ||
1465 | /* | |
1466 | * If any value in this region is non-zero, it isn't archaic | |
1467 | * DOS. | |
1468 | */ | |
1469 | if (!fat_bpb_is_zero(b)) { | |
1470 | if (!silent) | |
1471 | fat_msg(sb, KERN_ERR, | |
1472 | "%s; DOS 2.x BPB is non-zero", notdos1x); | |
1473 | goto out; | |
1474 | } | |
1475 | ||
1476 | for (i = 0; i < ARRAY_SIZE(floppy_defaults); i++) { | |
1477 | if (floppy_defaults[i].nr_sectors == bd_sects) { | |
1478 | fdefaults = &floppy_defaults[i]; | |
1479 | break; | |
1480 | } | |
1481 | } | |
1482 | ||
1483 | if (fdefaults == NULL) { | |
1484 | if (!silent) | |
1485 | fat_msg(sb, KERN_WARNING, | |
1486 | "This looks like a DOS 1.x volume, but isn't a recognized floppy size (%llu sectors)", | |
1487 | (u64)bd_sects); | |
1488 | goto out; | |
1489 | } | |
1490 | ||
1491 | if (!silent) | |
1492 | fat_msg(sb, KERN_INFO, | |
1493 | "This looks like a DOS 1.x volume; assuming default BPB values"); | |
1494 | ||
1495 | memset(bpb, 0, sizeof(*bpb)); | |
1496 | bpb->fat_sector_size = SECTOR_SIZE; | |
1497 | bpb->fat_sec_per_clus = fdefaults->sec_per_clus; | |
1498 | bpb->fat_reserved = 1; | |
1499 | bpb->fat_fats = 2; | |
1500 | bpb->fat_dir_entries = fdefaults->dir_entries; | |
1501 | bpb->fat_sectors = fdefaults->nr_sectors; | |
1502 | bpb->fat_fat_length = fdefaults->fat_length; | |
1503 | ||
1504 | error = 0; | |
1505 | ||
1506 | out: | |
1507 | return error; | |
1508 | } | |
1509 | ||
1da177e4 LT |
1510 | /* |
1511 | * Read the super block of an MS-DOS FS. | |
1512 | */ | |
384f5c96 | 1513 | int fat_fill_super(struct super_block *sb, void *data, int silent, int isvfat, |
3d23985d | 1514 | void (*setup)(struct super_block *)) |
1da177e4 | 1515 | { |
b522412a | 1516 | struct inode *root_inode = NULL, *fat_inode = NULL; |
020ac5b6 | 1517 | struct inode *fsinfo_inode = NULL; |
1da177e4 | 1518 | struct buffer_head *bh; |
190a8843 | 1519 | struct fat_bios_param_block bpb; |
1da177e4 LT |
1520 | struct msdos_sb_info *sbi; |
1521 | u16 logical_sector_size; | |
1522 | u32 total_sectors, total_clusters, fat_clusters, rootdir_sectors; | |
1523 | int debug; | |
1da177e4 LT |
1524 | long error; |
1525 | char buf[50]; | |
1526 | ||
8f593427 LT |
1527 | /* |
1528 | * GFP_KERNEL is ok here, because while we do hold the | |
1529 | * supeblock lock, memory pressure can't call back into | |
1530 | * the filesystem, since we're only just about to mount | |
1531 | * it and have no inodes etc active! | |
1532 | */ | |
f8314dc6 | 1533 | sbi = kzalloc(sizeof(struct msdos_sb_info), GFP_KERNEL); |
1da177e4 LT |
1534 | if (!sbi) |
1535 | return -ENOMEM; | |
1536 | sb->s_fs_info = sbi; | |
1da177e4 LT |
1537 | |
1538 | sb->s_flags |= MS_NODIRATIME; | |
1539 | sb->s_magic = MSDOS_SUPER_MAGIC; | |
1540 | sb->s_op = &fat_sops; | |
1541 | sb->s_export_op = &fat_export_ops; | |
8fceb4e0 | 1542 | mutex_init(&sbi->nfs_build_inode_lock); |
aaa04b48 OH |
1543 | ratelimit_state_init(&sbi->ratelimit, DEFAULT_RATELIMIT_INTERVAL, |
1544 | DEFAULT_RATELIMIT_BURST); | |
1da177e4 | 1545 | |
869f58c0 | 1546 | error = parse_options(sb, data, isvfat, silent, &debug, &sbi->options); |
1da177e4 LT |
1547 | if (error) |
1548 | goto out_fail; | |
1549 | ||
3d23985d AV |
1550 | setup(sb); /* flavour-specific stuff that needs options */ |
1551 | ||
1da177e4 LT |
1552 | error = -EIO; |
1553 | sb_min_blocksize(sb, 512); | |
1554 | bh = sb_bread(sb, 0); | |
1555 | if (bh == NULL) { | |
869f58c0 | 1556 | fat_msg(sb, KERN_ERR, "unable to read boot sector"); |
1da177e4 LT |
1557 | goto out_fail; |
1558 | } | |
1559 | ||
190a8843 CM |
1560 | error = fat_read_bpb(sb, (struct fat_boot_sector *)bh->b_data, silent, |
1561 | &bpb); | |
1562 | if (error == -EINVAL && sbi->options.dos1xfloppy) | |
1563 | error = fat_read_static_bpb(sb, | |
1564 | (struct fat_boot_sector *)bh->b_data, silent, &bpb); | |
1565 | brelse(bh); | |
1da177e4 | 1566 | |
190a8843 | 1567 | if (error == -EINVAL) |
1da177e4 | 1568 | goto out_invalid; |
190a8843 CM |
1569 | else if (error) |
1570 | goto out_fail; | |
1da177e4 | 1571 | |
190a8843 CM |
1572 | logical_sector_size = bpb.fat_sector_size; |
1573 | sbi->sec_per_clus = bpb.fat_sec_per_clus; | |
1574 | ||
1575 | error = -EIO; | |
1da177e4 | 1576 | if (logical_sector_size < sb->s_blocksize) { |
869f58c0 AF |
1577 | fat_msg(sb, KERN_ERR, "logical sector size too small for device" |
1578 | " (logical sector size = %u)", logical_sector_size); | |
1da177e4 LT |
1579 | goto out_fail; |
1580 | } | |
190a8843 | 1581 | |
1da177e4 | 1582 | if (logical_sector_size > sb->s_blocksize) { |
190a8843 | 1583 | struct buffer_head *bh_resize; |
1da177e4 LT |
1584 | |
1585 | if (!sb_set_blocksize(sb, logical_sector_size)) { | |
869f58c0 | 1586 | fat_msg(sb, KERN_ERR, "unable to set blocksize %u", |
1da177e4 LT |
1587 | logical_sector_size); |
1588 | goto out_fail; | |
1589 | } | |
190a8843 CM |
1590 | |
1591 | /* Verify that the larger boot sector is fully readable */ | |
1592 | bh_resize = sb_bread(sb, 0); | |
1593 | if (bh_resize == NULL) { | |
869f58c0 AF |
1594 | fat_msg(sb, KERN_ERR, "unable to read boot sector" |
1595 | " (logical sector size = %lu)", | |
1da177e4 LT |
1596 | sb->s_blocksize); |
1597 | goto out_fail; | |
1598 | } | |
190a8843 | 1599 | brelse(bh_resize); |
1da177e4 LT |
1600 | } |
1601 | ||
e40b34c7 | 1602 | mutex_init(&sbi->s_lock); |
1da177e4 LT |
1603 | sbi->cluster_size = sb->s_blocksize * sbi->sec_per_clus; |
1604 | sbi->cluster_bits = ffs(sbi->cluster_size) - 1; | |
190a8843 | 1605 | sbi->fats = bpb.fat_fats; |
1da177e4 | 1606 | sbi->fat_bits = 0; /* Don't know yet */ |
190a8843 CM |
1607 | sbi->fat_start = bpb.fat_reserved; |
1608 | sbi->fat_length = bpb.fat_fat_length; | |
1da177e4 LT |
1609 | sbi->root_cluster = 0; |
1610 | sbi->free_clusters = -1; /* Don't know yet */ | |
606e423e | 1611 | sbi->free_clus_valid = 0; |
1da177e4 | 1612 | sbi->prev_free = FAT_START_ENT; |
710d4403 | 1613 | sb->s_maxbytes = 0xffffffff; |
1da177e4 | 1614 | |
190a8843 | 1615 | if (!sbi->fat_length && bpb.fat32_length) { |
1da177e4 LT |
1616 | struct fat_boot_fsinfo *fsinfo; |
1617 | struct buffer_head *fsinfo_bh; | |
1618 | ||
1619 | /* Must be FAT32 */ | |
1620 | sbi->fat_bits = 32; | |
190a8843 CM |
1621 | sbi->fat_length = bpb.fat32_length; |
1622 | sbi->root_cluster = bpb.fat32_root_cluster; | |
1da177e4 | 1623 | |
1da177e4 | 1624 | /* MC - if info_sector is 0, don't multiply by 0 */ |
190a8843 | 1625 | sbi->fsinfo_sector = bpb.fat32_info_sector; |
1da177e4 LT |
1626 | if (sbi->fsinfo_sector == 0) |
1627 | sbi->fsinfo_sector = 1; | |
1628 | ||
1629 | fsinfo_bh = sb_bread(sb, sbi->fsinfo_sector); | |
1630 | if (fsinfo_bh == NULL) { | |
869f58c0 AF |
1631 | fat_msg(sb, KERN_ERR, "bread failed, FSINFO block" |
1632 | " (sector = %lu)", sbi->fsinfo_sector); | |
1da177e4 LT |
1633 | goto out_fail; |
1634 | } | |
1635 | ||
1636 | fsinfo = (struct fat_boot_fsinfo *)fsinfo_bh->b_data; | |
1637 | if (!IS_FSINFO(fsinfo)) { | |
869f58c0 AF |
1638 | fat_msg(sb, KERN_WARNING, "Invalid FSINFO signature: " |
1639 | "0x%08x, 0x%08x (sector = %lu)", | |
1da177e4 LT |
1640 | le32_to_cpu(fsinfo->signature1), |
1641 | le32_to_cpu(fsinfo->signature2), | |
1642 | sbi->fsinfo_sector); | |
1643 | } else { | |
28ec039c | 1644 | if (sbi->options.usefree) |
606e423e OH |
1645 | sbi->free_clus_valid = 1; |
1646 | sbi->free_clusters = le32_to_cpu(fsinfo->free_clusters); | |
1da177e4 LT |
1647 | sbi->prev_free = le32_to_cpu(fsinfo->next_cluster); |
1648 | } | |
1649 | ||
1650 | brelse(fsinfo_bh); | |
1651 | } | |
1652 | ||
6e5b93ee ML |
1653 | /* interpret volume ID as a little endian 32 bit integer */ |
1654 | if (sbi->fat_bits == 32) | |
190a8843 | 1655 | sbi->vol_id = bpb.fat32_vol_id; |
6e5b93ee | 1656 | else /* fat 16 or 12 */ |
190a8843 | 1657 | sbi->vol_id = bpb.fat16_vol_id; |
6e5b93ee | 1658 | |
1da177e4 LT |
1659 | sbi->dir_per_block = sb->s_blocksize / sizeof(struct msdos_dir_entry); |
1660 | sbi->dir_per_block_bits = ffs(sbi->dir_per_block) - 1; | |
1661 | ||
1662 | sbi->dir_start = sbi->fat_start + sbi->fats * sbi->fat_length; | |
190a8843 | 1663 | sbi->dir_entries = bpb.fat_dir_entries; |
1da177e4 LT |
1664 | if (sbi->dir_entries & (sbi->dir_per_block - 1)) { |
1665 | if (!silent) | |
c39540c6 | 1666 | fat_msg(sb, KERN_ERR, "bogus directory-entries per block" |
869f58c0 | 1667 | " (%u)", sbi->dir_entries); |
1da177e4 LT |
1668 | goto out_invalid; |
1669 | } | |
1670 | ||
1671 | rootdir_sectors = sbi->dir_entries | |
1672 | * sizeof(struct msdos_dir_entry) / sb->s_blocksize; | |
1673 | sbi->data_start = sbi->dir_start + rootdir_sectors; | |
190a8843 | 1674 | total_sectors = bpb.fat_sectors; |
1da177e4 | 1675 | if (total_sectors == 0) |
190a8843 | 1676 | total_sectors = bpb.fat_total_sect; |
1da177e4 LT |
1677 | |
1678 | total_clusters = (total_sectors - sbi->data_start) / sbi->sec_per_clus; | |
1679 | ||
1680 | if (sbi->fat_bits != 32) | |
1681 | sbi->fat_bits = (total_clusters > MAX_FAT12) ? 16 : 12; | |
1682 | ||
b88a1058 OR |
1683 | /* some OSes set FAT_STATE_DIRTY and clean it on unmount. */ |
1684 | if (sbi->fat_bits == 32) | |
190a8843 | 1685 | sbi->dirty = bpb.fat32_state & FAT_STATE_DIRTY; |
b88a1058 | 1686 | else /* fat 16 or 12 */ |
190a8843 | 1687 | sbi->dirty = bpb.fat16_state & FAT_STATE_DIRTY; |
b88a1058 | 1688 | |
1da177e4 | 1689 | /* check that FAT table does not overflow */ |
7b92d03c | 1690 | fat_clusters = calc_fat_clusters(sb); |
1da177e4 LT |
1691 | total_clusters = min(total_clusters, fat_clusters - FAT_START_ENT); |
1692 | if (total_clusters > MAX_FAT(sb)) { | |
1693 | if (!silent) | |
869f58c0 | 1694 | fat_msg(sb, KERN_ERR, "count of clusters too big (%u)", |
1da177e4 | 1695 | total_clusters); |
1da177e4 LT |
1696 | goto out_invalid; |
1697 | } | |
1698 | ||
1699 | sbi->max_cluster = total_clusters + FAT_START_ENT; | |
1700 | /* check the free_clusters, it's not necessarily correct */ | |
1701 | if (sbi->free_clusters != -1 && sbi->free_clusters > total_clusters) | |
1702 | sbi->free_clusters = -1; | |
1703 | /* check the prev_free, it's not necessarily correct */ | |
1704 | sbi->prev_free %= sbi->max_cluster; | |
1705 | if (sbi->prev_free < FAT_START_ENT) | |
1706 | sbi->prev_free = FAT_START_ENT; | |
1707 | ||
1da177e4 LT |
1708 | /* set up enough so that it can read an inode */ |
1709 | fat_hash_init(sb); | |
7669e8fb | 1710 | dir_hash_init(sb); |
1da177e4 LT |
1711 | fat_ent_access_init(sb); |
1712 | ||
1713 | /* | |
1714 | * The low byte of FAT's first entry must have same value with | |
1715 | * media-field. But in real world, too many devices is | |
1716 | * writing wrong value. So, removed that validity check. | |
1717 | * | |
1718 | * if (FAT_FIRST_ENT(sb, media) != first) | |
1719 | */ | |
1720 | ||
1721 | error = -EINVAL; | |
1722 | sprintf(buf, "cp%d", sbi->options.codepage); | |
1723 | sbi->nls_disk = load_nls(buf); | |
1724 | if (!sbi->nls_disk) { | |
869f58c0 | 1725 | fat_msg(sb, KERN_ERR, "codepage %s not found", buf); |
1da177e4 LT |
1726 | goto out_fail; |
1727 | } | |
1728 | ||
1729 | /* FIXME: utf8 is using iocharset for upper/lower conversion */ | |
1730 | if (sbi->options.isvfat) { | |
1731 | sbi->nls_io = load_nls(sbi->options.iocharset); | |
1732 | if (!sbi->nls_io) { | |
869f58c0 | 1733 | fat_msg(sb, KERN_ERR, "IO charset %s not found", |
1da177e4 LT |
1734 | sbi->options.iocharset); |
1735 | goto out_fail; | |
1736 | } | |
1737 | } | |
1738 | ||
1739 | error = -ENOMEM; | |
b522412a AV |
1740 | fat_inode = new_inode(sb); |
1741 | if (!fat_inode) | |
1742 | goto out_fail; | |
1743 | MSDOS_I(fat_inode)->i_pos = 0; | |
1744 | sbi->fat_inode = fat_inode; | |
020ac5b6 AB |
1745 | |
1746 | fsinfo_inode = new_inode(sb); | |
1747 | if (!fsinfo_inode) | |
1748 | goto out_fail; | |
1749 | fsinfo_inode->i_ino = MSDOS_FSINFO_INO; | |
1750 | sbi->fsinfo_inode = fsinfo_inode; | |
1751 | insert_inode_hash(fsinfo_inode); | |
1752 | ||
1da177e4 LT |
1753 | root_inode = new_inode(sb); |
1754 | if (!root_inode) | |
1755 | goto out_fail; | |
1756 | root_inode->i_ino = MSDOS_ROOT_INO; | |
1757 | root_inode->i_version = 1; | |
1758 | error = fat_read_root(root_inode); | |
1688f860 AV |
1759 | if (error < 0) { |
1760 | iput(root_inode); | |
1da177e4 | 1761 | goto out_fail; |
1688f860 | 1762 | } |
1da177e4 LT |
1763 | error = -ENOMEM; |
1764 | insert_inode_hash(root_inode); | |
7669e8fb | 1765 | fat_attach(root_inode, 0); |
1688f860 | 1766 | sb->s_root = d_make_root(root_inode); |
1da177e4 | 1767 | if (!sb->s_root) { |
869f58c0 | 1768 | fat_msg(sb, KERN_ERR, "get root inode failed"); |
1da177e4 LT |
1769 | goto out_fail; |
1770 | } | |
1771 | ||
f562146a NJ |
1772 | if (sbi->options.discard) { |
1773 | struct request_queue *q = bdev_get_queue(sb->s_bdev); | |
1774 | if (!blk_queue_discard(q)) | |
1775 | fat_msg(sb, KERN_WARNING, | |
1776 | "mounting with \"discard\" option, but " | |
1777 | "the device does not support discard"); | |
1778 | } | |
1779 | ||
b88a1058 | 1780 | fat_set_state(sb, 1, 0); |
1da177e4 LT |
1781 | return 0; |
1782 | ||
1783 | out_invalid: | |
1784 | error = -EINVAL; | |
1785 | if (!silent) | |
869f58c0 | 1786 | fat_msg(sb, KERN_INFO, "Can't find a valid FAT filesystem"); |
1da177e4 LT |
1787 | |
1788 | out_fail: | |
020ac5b6 AB |
1789 | if (fsinfo_inode) |
1790 | iput(fsinfo_inode); | |
b522412a AV |
1791 | if (fat_inode) |
1792 | iput(fat_inode); | |
1bdb6f91 OH |
1793 | unload_nls(sbi->nls_io); |
1794 | unload_nls(sbi->nls_disk); | |
1da177e4 LT |
1795 | if (sbi->options.iocharset != fat_default_iocharset) |
1796 | kfree(sbi->options.iocharset); | |
1797 | sb->s_fs_info = NULL; | |
1798 | kfree(sbi); | |
1799 | return error; | |
1800 | } | |
1801 | ||
7c709d00 | 1802 | EXPORT_SYMBOL_GPL(fat_fill_super); |
1da177e4 | 1803 | |
ae78bf9c CM |
1804 | /* |
1805 | * helper function for fat_flush_inodes. This writes both the inode | |
1806 | * and the file data blocks, waiting for in flight data blocks before | |
1807 | * the start of the call. It does not wait for any io started | |
1808 | * during the call | |
1809 | */ | |
1810 | static int writeback_inode(struct inode *inode) | |
1811 | { | |
1812 | ||
1813 | int ret; | |
14864655 NJ |
1814 | |
1815 | /* if we used wait=1, sync_inode_metadata waits for the io for the | |
1816 | * inode to finish. So wait=0 is sent down to sync_inode_metadata | |
ae78bf9c CM |
1817 | * and filemap_fdatawrite is used for the data blocks |
1818 | */ | |
14864655 | 1819 | ret = sync_inode_metadata(inode, 0); |
ae78bf9c | 1820 | if (!ret) |
14864655 | 1821 | ret = filemap_fdatawrite(inode->i_mapping); |
ae78bf9c CM |
1822 | return ret; |
1823 | } | |
1824 | ||
1825 | /* | |
1826 | * write data and metadata corresponding to i1 and i2. The io is | |
1827 | * started but we do not wait for any of it to finish. | |
1828 | * | |
1829 | * filemap_flush is used for the block device, so if there is a dirty | |
1830 | * page for a block already in flight, we will not wait and start the | |
1831 | * io over again | |
1832 | */ | |
1833 | int fat_flush_inodes(struct super_block *sb, struct inode *i1, struct inode *i2) | |
1834 | { | |
1835 | int ret = 0; | |
1836 | if (!MSDOS_SB(sb)->options.flush) | |
1837 | return 0; | |
1838 | if (i1) | |
1839 | ret = writeback_inode(i1); | |
1840 | if (!ret && i2) | |
1841 | ret = writeback_inode(i2); | |
97e860d3 | 1842 | if (!ret) { |
ae78bf9c CM |
1843 | struct address_space *mapping = sb->s_bdev->bd_inode->i_mapping; |
1844 | ret = filemap_flush(mapping); | |
1845 | } | |
1846 | return ret; | |
1847 | } | |
1848 | EXPORT_SYMBOL_GPL(fat_flush_inodes); | |
1849 | ||
1da177e4 LT |
1850 | static int __init init_fat_fs(void) |
1851 | { | |
532a39a3 | 1852 | int err; |
1da177e4 | 1853 | |
532a39a3 PE |
1854 | err = fat_cache_init(); |
1855 | if (err) | |
1856 | return err; | |
1857 | ||
1858 | err = fat_init_inodecache(); | |
1859 | if (err) | |
1860 | goto failed; | |
1861 | ||
1862 | return 0; | |
1863 | ||
1864 | failed: | |
1865 | fat_cache_destroy(); | |
1866 | return err; | |
1da177e4 LT |
1867 | } |
1868 | ||
1869 | static void __exit exit_fat_fs(void) | |
1870 | { | |
1871 | fat_cache_destroy(); | |
1872 | fat_destroy_inodecache(); | |
1873 | } | |
1874 | ||
1875 | module_init(init_fat_fs) | |
1876 | module_exit(exit_fat_fs) | |
1877 | ||
1878 | MODULE_LICENSE("GPL"); |