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> | |
14 | #include <linux/init.h> | |
15 | #include <linux/time.h> | |
16 | #include <linux/slab.h> | |
1da177e4 | 17 | #include <linux/seq_file.h> |
1da177e4 | 18 | #include <linux/pagemap.h> |
a5425d29 | 19 | #include <linux/mpage.h> |
1da177e4 | 20 | #include <linux/buffer_head.h> |
a5694255 | 21 | #include <linux/exportfs.h> |
1da177e4 LT |
22 | #include <linux/mount.h> |
23 | #include <linux/vfs.h> | |
24 | #include <linux/parser.h> | |
e5174baa | 25 | #include <linux/uio.h> |
ae78bf9c | 26 | #include <linux/writeback.h> |
e7d709c0 | 27 | #include <linux/log2.h> |
d3dfa822 | 28 | #include <linux/hash.h> |
f562146a | 29 | #include <linux/blkdev.h> |
1da177e4 | 30 | #include <asm/unaligned.h> |
9e975dae | 31 | #include "fat.h" |
1da177e4 LT |
32 | |
33 | #ifndef CONFIG_FAT_DEFAULT_IOCHARSET | |
34 | /* if user don't select VFAT, this is undefined. */ | |
35 | #define CONFIG_FAT_DEFAULT_IOCHARSET "" | |
36 | #endif | |
37 | ||
38 | static int fat_default_codepage = CONFIG_FAT_DEFAULT_CODEPAGE; | |
39 | static char fat_default_iocharset[] = CONFIG_FAT_DEFAULT_IOCHARSET; | |
40 | ||
41 | ||
42 | static int fat_add_cluster(struct inode *inode) | |
43 | { | |
44 | int err, cluster; | |
45 | ||
46 | err = fat_alloc_clusters(inode, &cluster, 1); | |
47 | if (err) | |
48 | return err; | |
49 | /* FIXME: this cluster should be added after data of this | |
50 | * cluster is writed */ | |
51 | err = fat_chain_add(inode, cluster, 1); | |
52 | if (err) | |
53 | fat_free_clusters(inode, cluster); | |
54 | return err; | |
55 | } | |
56 | ||
6a1d9805 OH |
57 | static inline int __fat_get_block(struct inode *inode, sector_t iblock, |
58 | unsigned long *max_blocks, | |
59 | struct buffer_head *bh_result, int create) | |
1da177e4 LT |
60 | { |
61 | struct super_block *sb = inode->i_sb; | |
e5174baa | 62 | struct msdos_sb_info *sbi = MSDOS_SB(sb); |
e5174baa | 63 | unsigned long mapped_blocks; |
6a1d9805 | 64 | sector_t phys; |
e5174baa | 65 | int err, offset; |
1da177e4 | 66 | |
2bdf67eb | 67 | err = fat_bmap(inode, iblock, &phys, &mapped_blocks, create); |
1da177e4 LT |
68 | if (err) |
69 | return err; | |
70 | if (phys) { | |
71 | map_bh(bh_result, sb, phys); | |
e5174baa | 72 | *max_blocks = min(mapped_blocks, *max_blocks); |
1da177e4 LT |
73 | return 0; |
74 | } | |
75 | if (!create) | |
76 | return 0; | |
e5174baa | 77 | |
1da177e4 | 78 | if (iblock != MSDOS_I(inode)->mmu_private >> sb->s_blocksize_bits) { |
85c78591 | 79 | fat_fs_error(sb, "corrupted file size (i_pos %lld, %lld)", |
6a1d9805 | 80 | MSDOS_I(inode)->i_pos, MSDOS_I(inode)->mmu_private); |
1da177e4 LT |
81 | return -EIO; |
82 | } | |
e5174baa OH |
83 | |
84 | offset = (unsigned long)iblock & (sbi->sec_per_clus - 1); | |
85 | if (!offset) { | |
86 | /* TODO: multiple cluster allocation would be desirable. */ | |
1da177e4 LT |
87 | err = fat_add_cluster(inode); |
88 | if (err) | |
89 | return err; | |
90 | } | |
e5174baa OH |
91 | /* available blocks on this cluster */ |
92 | mapped_blocks = sbi->sec_per_clus - offset; | |
93 | ||
94 | *max_blocks = min(mapped_blocks, *max_blocks); | |
95 | MSDOS_I(inode)->mmu_private += *max_blocks << sb->s_blocksize_bits; | |
96 | ||
2bdf67eb | 97 | err = fat_bmap(inode, iblock, &phys, &mapped_blocks, create); |
1da177e4 LT |
98 | if (err) |
99 | return err; | |
6a1d9805 | 100 | |
e5174baa OH |
101 | BUG_ON(!phys); |
102 | BUG_ON(*max_blocks != mapped_blocks); | |
1da177e4 LT |
103 | set_buffer_new(bh_result); |
104 | map_bh(bh_result, sb, phys); | |
6a1d9805 | 105 | |
1da177e4 LT |
106 | return 0; |
107 | } | |
108 | ||
6a1d9805 OH |
109 | static int fat_get_block(struct inode *inode, sector_t iblock, |
110 | struct buffer_head *bh_result, int create) | |
e5174baa OH |
111 | { |
112 | struct super_block *sb = inode->i_sb; | |
1d8fa7a2 | 113 | unsigned long max_blocks = bh_result->b_size >> inode->i_blkbits; |
6a1d9805 | 114 | int err; |
e5174baa | 115 | |
6a1d9805 | 116 | err = __fat_get_block(inode, iblock, &max_blocks, bh_result, create); |
e5174baa OH |
117 | if (err) |
118 | return err; | |
119 | bh_result->b_size = max_blocks << sb->s_blocksize_bits; | |
120 | return 0; | |
121 | } | |
122 | ||
1da177e4 LT |
123 | static int fat_writepage(struct page *page, struct writeback_control *wbc) |
124 | { | |
125 | return block_write_full_page(page, fat_get_block, wbc); | |
126 | } | |
127 | ||
a5425d29 OH |
128 | static int fat_writepages(struct address_space *mapping, |
129 | struct writeback_control *wbc) | |
130 | { | |
131 | return mpage_writepages(mapping, wbc, fat_get_block); | |
132 | } | |
133 | ||
1da177e4 LT |
134 | static int fat_readpage(struct file *file, struct page *page) |
135 | { | |
a5425d29 OH |
136 | return mpage_readpage(page, fat_get_block); |
137 | } | |
138 | ||
139 | static int fat_readpages(struct file *file, struct address_space *mapping, | |
140 | struct list_head *pages, unsigned nr_pages) | |
141 | { | |
142 | return mpage_readpages(mapping, pages, nr_pages, fat_get_block); | |
1da177e4 LT |
143 | } |
144 | ||
459f6ed3 | 145 | static void fat_write_failed(struct address_space *mapping, loff_t to) |
146 | { | |
147 | struct inode *inode = mapping->host; | |
148 | ||
149 | if (to > inode->i_size) { | |
150 | truncate_pagecache(inode, to, inode->i_size); | |
151 | fat_truncate_blocks(inode, inode->i_size); | |
152 | } | |
153 | } | |
154 | ||
d7777a25 NP |
155 | static int fat_write_begin(struct file *file, struct address_space *mapping, |
156 | loff_t pos, unsigned len, unsigned flags, | |
157 | struct page **pagep, void **fsdata) | |
1da177e4 | 158 | { |
459f6ed3 | 159 | int err; |
160 | ||
d7777a25 | 161 | *pagep = NULL; |
282dc178 | 162 | err = cont_write_begin(file, mapping, pos, len, flags, |
459f6ed3 | 163 | pagep, fsdata, fat_get_block, |
d7777a25 | 164 | &MSDOS_I(mapping->host)->mmu_private); |
459f6ed3 | 165 | if (err < 0) |
166 | fat_write_failed(mapping, pos + len); | |
167 | return err; | |
1da177e4 LT |
168 | } |
169 | ||
d7777a25 NP |
170 | static int fat_write_end(struct file *file, struct address_space *mapping, |
171 | loff_t pos, unsigned len, unsigned copied, | |
172 | struct page *pagep, void *fsdata) | |
ef402268 | 173 | { |
d7777a25 NP |
174 | struct inode *inode = mapping->host; |
175 | int err; | |
176 | err = generic_write_end(file, mapping, pos, len, copied, pagep, fsdata); | |
459f6ed3 | 177 | if (err < len) |
178 | fat_write_failed(mapping, pos + len); | |
d7777a25 | 179 | if (!(err < 0) && !(MSDOS_I(inode)->i_attrs & ATTR_ARCH)) { |
ef402268 OH |
180 | inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC; |
181 | MSDOS_I(inode)->i_attrs |= ATTR_ARCH; | |
182 | mark_inode_dirty(inode); | |
183 | } | |
184 | return err; | |
185 | } | |
186 | ||
e5174baa OH |
187 | static ssize_t fat_direct_IO(int rw, struct kiocb *iocb, |
188 | const struct iovec *iov, | |
189 | loff_t offset, unsigned long nr_segs) | |
190 | { | |
191 | struct file *file = iocb->ki_filp; | |
459f6ed3 | 192 | struct address_space *mapping = file->f_mapping; |
193 | struct inode *inode = mapping->host; | |
194 | ssize_t ret; | |
e5174baa OH |
195 | |
196 | if (rw == WRITE) { | |
197 | /* | |
4e02ed4b | 198 | * FIXME: blockdev_direct_IO() doesn't use ->write_begin(), |
e5174baa OH |
199 | * so we need to update the ->mmu_private to block boundary. |
200 | * | |
201 | * But we must fill the remaining area or hole by nul for | |
202 | * updating ->mmu_private. | |
94412a96 OH |
203 | * |
204 | * Return 0, and fallback to normal buffered write. | |
e5174baa OH |
205 | */ |
206 | loff_t size = offset + iov_length(iov, nr_segs); | |
207 | if (MSDOS_I(inode)->mmu_private < size) | |
94412a96 | 208 | return 0; |
e5174baa OH |
209 | } |
210 | ||
211 | /* | |
212 | * FAT need to use the DIO_LOCKING for avoiding the race | |
213 | * condition of fat_get_block() and ->truncate(). | |
214 | */ | |
aacfc19c CH |
215 | ret = blockdev_direct_IO(rw, iocb, inode, iov, offset, nr_segs, |
216 | fat_get_block); | |
459f6ed3 | 217 | if (ret < 0 && (rw & WRITE)) |
218 | fat_write_failed(mapping, offset + iov_length(iov, nr_segs)); | |
219 | ||
220 | return ret; | |
e5174baa OH |
221 | } |
222 | ||
1da177e4 LT |
223 | static sector_t _fat_bmap(struct address_space *mapping, sector_t block) |
224 | { | |
fa93ca18 OH |
225 | sector_t blocknr; |
226 | ||
227 | /* fat_get_cluster() assumes the requested blocknr isn't truncated. */ | |
58268691 | 228 | down_read(&MSDOS_I(mapping->host)->truncate_lock); |
fa93ca18 | 229 | blocknr = generic_block_bmap(mapping, block, fat_get_block); |
58268691 | 230 | up_read(&MSDOS_I(mapping->host)->truncate_lock); |
fa93ca18 OH |
231 | |
232 | return blocknr; | |
1da177e4 LT |
233 | } |
234 | ||
f5e54d6e | 235 | static const struct address_space_operations fat_aops = { |
1da177e4 | 236 | .readpage = fat_readpage, |
a5425d29 | 237 | .readpages = fat_readpages, |
1da177e4 | 238 | .writepage = fat_writepage, |
a5425d29 | 239 | .writepages = fat_writepages, |
d7777a25 NP |
240 | .write_begin = fat_write_begin, |
241 | .write_end = fat_write_end, | |
e5174baa | 242 | .direct_IO = fat_direct_IO, |
1da177e4 LT |
243 | .bmap = _fat_bmap |
244 | }; | |
245 | ||
246 | /* | |
247 | * New FAT inode stuff. We do the following: | |
248 | * a) i_ino is constant and has nothing with on-disk location. | |
249 | * b) FAT manages its own cache of directory entries. | |
250 | * c) *This* cache is indexed by on-disk location. | |
251 | * d) inode has an associated directory entry, all right, but | |
252 | * it may be unhashed. | |
253 | * e) currently entries are stored within struct inode. That should | |
254 | * change. | |
255 | * f) we deal with races in the following way: | |
256 | * 1. readdir() and lookup() do FAT-dir-cache lookup. | |
257 | * 2. rename() unhashes the F-d-c entry and rehashes it in | |
258 | * a new place. | |
259 | * 3. unlink() and rmdir() unhash F-d-c entry. | |
260 | * 4. fat_write_inode() checks whether the thing is unhashed. | |
261 | * If it is we silently return. If it isn't we do bread(), | |
262 | * check if the location is still valid and retry if it | |
263 | * isn't. Otherwise we do changes. | |
264 | * 5. Spinlock is used to protect hash/unhash/location check/lookup | |
deee3ce4 | 265 | * 6. fat_evict_inode() unhashes the F-d-c entry. |
1da177e4 LT |
266 | * 7. lookup() and readdir() do igrab() if they find a F-d-c entry |
267 | * and consider negative result as cache miss. | |
268 | */ | |
269 | ||
270 | static void fat_hash_init(struct super_block *sb) | |
271 | { | |
272 | struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
273 | int i; | |
274 | ||
275 | spin_lock_init(&sbi->inode_hash_lock); | |
276 | for (i = 0; i < FAT_HASH_SIZE; i++) | |
277 | INIT_HLIST_HEAD(&sbi->inode_hashtable[i]); | |
278 | } | |
279 | ||
d3dfa822 | 280 | static inline unsigned long fat_hash(loff_t i_pos) |
1da177e4 | 281 | { |
d3dfa822 | 282 | return hash_32(i_pos, FAT_HASH_BITS); |
1da177e4 LT |
283 | } |
284 | ||
7669e8fb SM |
285 | static void dir_hash_init(struct super_block *sb) |
286 | { | |
287 | struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
288 | int i; | |
289 | ||
290 | spin_lock_init(&sbi->dir_hash_lock); | |
291 | for (i = 0; i < FAT_HASH_SIZE; i++) | |
292 | INIT_HLIST_HEAD(&sbi->dir_hashtable[i]); | |
293 | } | |
294 | ||
1da177e4 LT |
295 | void fat_attach(struct inode *inode, loff_t i_pos) |
296 | { | |
d3dfa822 | 297 | struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb); |
1da177e4 | 298 | |
7669e8fb SM |
299 | if (inode->i_ino != MSDOS_ROOT_INO) { |
300 | struct hlist_head *head = sbi->inode_hashtable | |
301 | + fat_hash(i_pos); | |
302 | ||
303 | spin_lock(&sbi->inode_hash_lock); | |
304 | MSDOS_I(inode)->i_pos = i_pos; | |
305 | hlist_add_head(&MSDOS_I(inode)->i_fat_hash, head); | |
306 | spin_unlock(&sbi->inode_hash_lock); | |
307 | } | |
308 | ||
309 | /* If NFS support is enabled, cache the mapping of start cluster | |
310 | * to directory inode. This is used during reconnection of | |
311 | * dentries to the filesystem root. | |
312 | */ | |
313 | if (S_ISDIR(inode->i_mode) && sbi->options.nfs) { | |
314 | struct hlist_head *d_head = sbi->dir_hashtable; | |
315 | d_head += fat_dir_hash(MSDOS_I(inode)->i_logstart); | |
316 | ||
317 | spin_lock(&sbi->dir_hash_lock); | |
318 | hlist_add_head(&MSDOS_I(inode)->i_dir_hash, d_head); | |
319 | spin_unlock(&sbi->dir_hash_lock); | |
320 | } | |
1da177e4 | 321 | } |
7c709d00 | 322 | EXPORT_SYMBOL_GPL(fat_attach); |
1da177e4 LT |
323 | |
324 | void fat_detach(struct inode *inode) | |
325 | { | |
326 | struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb); | |
327 | spin_lock(&sbi->inode_hash_lock); | |
328 | MSDOS_I(inode)->i_pos = 0; | |
329 | hlist_del_init(&MSDOS_I(inode)->i_fat_hash); | |
330 | spin_unlock(&sbi->inode_hash_lock); | |
7669e8fb SM |
331 | |
332 | if (S_ISDIR(inode->i_mode) && sbi->options.nfs) { | |
333 | spin_lock(&sbi->dir_hash_lock); | |
334 | hlist_del_init(&MSDOS_I(inode)->i_dir_hash); | |
335 | spin_unlock(&sbi->dir_hash_lock); | |
336 | } | |
1da177e4 | 337 | } |
7c709d00 | 338 | EXPORT_SYMBOL_GPL(fat_detach); |
1da177e4 LT |
339 | |
340 | struct inode *fat_iget(struct super_block *sb, loff_t i_pos) | |
341 | { | |
342 | struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
d3dfa822 | 343 | struct hlist_head *head = sbi->inode_hashtable + fat_hash(i_pos); |
1da177e4 LT |
344 | struct msdos_inode_info *i; |
345 | struct inode *inode = NULL; | |
346 | ||
347 | spin_lock(&sbi->inode_hash_lock); | |
b67bfe0d | 348 | hlist_for_each_entry(i, head, i_fat_hash) { |
1da177e4 LT |
349 | BUG_ON(i->vfs_inode.i_sb != sb); |
350 | if (i->i_pos != i_pos) | |
351 | continue; | |
352 | inode = igrab(&i->vfs_inode); | |
353 | if (inode) | |
354 | break; | |
355 | } | |
356 | spin_unlock(&sbi->inode_hash_lock); | |
357 | return inode; | |
358 | } | |
359 | ||
360 | static int is_exec(unsigned char *extension) | |
361 | { | |
362 | unsigned char *exe_extensions = "EXECOMBAT", *walk; | |
363 | ||
364 | for (walk = exe_extensions; *walk; walk += 3) | |
365 | if (!strncmp(extension, walk, 3)) | |
366 | return 1; | |
367 | return 0; | |
368 | } | |
369 | ||
370 | static int fat_calc_dir_size(struct inode *inode) | |
371 | { | |
372 | struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb); | |
373 | int ret, fclus, dclus; | |
374 | ||
375 | inode->i_size = 0; | |
376 | if (MSDOS_I(inode)->i_start == 0) | |
377 | return 0; | |
378 | ||
379 | ret = fat_get_cluster(inode, FAT_ENT_EOF, &fclus, &dclus); | |
380 | if (ret < 0) | |
381 | return ret; | |
382 | inode->i_size = (fclus + 1) << sbi->cluster_bits; | |
383 | ||
384 | return 0; | |
385 | } | |
386 | ||
387 | /* doesn't deal with root inode */ | |
388 | static int fat_fill_inode(struct inode *inode, struct msdos_dir_entry *de) | |
389 | { | |
390 | struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb); | |
391 | int error; | |
392 | ||
393 | MSDOS_I(inode)->i_pos = 0; | |
394 | inode->i_uid = sbi->options.fs_uid; | |
395 | inode->i_gid = sbi->options.fs_gid; | |
396 | inode->i_version++; | |
397 | inode->i_generation = get_seconds(); | |
398 | ||
399 | if ((de->attr & ATTR_DIR) && !IS_FREE(de->name)) { | |
400 | inode->i_generation &= ~1; | |
9c0aa1b8 | 401 | inode->i_mode = fat_make_mode(sbi, de->attr, S_IRWXUGO); |
1da177e4 LT |
402 | inode->i_op = sbi->dir_ops; |
403 | inode->i_fop = &fat_dir_operations; | |
404 | ||
a943ed71 | 405 | MSDOS_I(inode)->i_start = fat_get_start(sbi, de); |
1da177e4 LT |
406 | MSDOS_I(inode)->i_logstart = MSDOS_I(inode)->i_start; |
407 | error = fat_calc_dir_size(inode); | |
408 | if (error < 0) | |
409 | return error; | |
410 | MSDOS_I(inode)->mmu_private = inode->i_size; | |
411 | ||
bfe86848 | 412 | set_nlink(inode, fat_subdirs(inode)); |
1da177e4 LT |
413 | } else { /* not a directory */ |
414 | inode->i_generation |= 1; | |
9c0aa1b8 OH |
415 | inode->i_mode = fat_make_mode(sbi, de->attr, |
416 | ((sbi->options.showexec && !is_exec(de->name + 8)) | |
417 | ? S_IRUGO|S_IWUGO : S_IRWXUGO)); | |
a943ed71 | 418 | MSDOS_I(inode)->i_start = fat_get_start(sbi, de); |
1da177e4 LT |
419 | |
420 | MSDOS_I(inode)->i_logstart = MSDOS_I(inode)->i_start; | |
421 | inode->i_size = le32_to_cpu(de->size); | |
422 | inode->i_op = &fat_file_inode_operations; | |
423 | inode->i_fop = &fat_file_operations; | |
424 | inode->i_mapping->a_ops = &fat_aops; | |
425 | MSDOS_I(inode)->mmu_private = inode->i_size; | |
426 | } | |
427 | if (de->attr & ATTR_SYS) { | |
428 | if (sbi->options.sys_immutable) | |
429 | inode->i_flags |= S_IMMUTABLE; | |
430 | } | |
9c0aa1b8 OH |
431 | fat_save_attrs(inode, de->attr); |
432 | ||
1da177e4 LT |
433 | inode->i_blocks = ((inode->i_size + (sbi->cluster_size - 1)) |
434 | & ~((loff_t)sbi->cluster_size - 1)) >> 9; | |
7decd1cb OH |
435 | |
436 | fat_time_fat2unix(sbi, &inode->i_mtime, de->time, de->date, 0); | |
1da177e4 | 437 | if (sbi->options.isvfat) { |
7decd1cb OH |
438 | fat_time_fat2unix(sbi, &inode->i_ctime, de->ctime, |
439 | de->cdate, de->ctime_cs); | |
440 | fat_time_fat2unix(sbi, &inode->i_atime, 0, de->adate, 0); | |
1da177e4 | 441 | } else |
62a36c43 | 442 | inode->i_ctime = inode->i_atime = inode->i_mtime; |
1da177e4 LT |
443 | |
444 | return 0; | |
445 | } | |
446 | ||
447 | struct inode *fat_build_inode(struct super_block *sb, | |
448 | struct msdos_dir_entry *de, loff_t i_pos) | |
449 | { | |
450 | struct inode *inode; | |
451 | int err; | |
452 | ||
453 | inode = fat_iget(sb, i_pos); | |
454 | if (inode) | |
455 | goto out; | |
456 | inode = new_inode(sb); | |
457 | if (!inode) { | |
458 | inode = ERR_PTR(-ENOMEM); | |
459 | goto out; | |
460 | } | |
461 | inode->i_ino = iunique(sb, MSDOS_ROOT_INO); | |
462 | inode->i_version = 1; | |
463 | err = fat_fill_inode(inode, de); | |
464 | if (err) { | |
465 | iput(inode); | |
466 | inode = ERR_PTR(err); | |
467 | goto out; | |
468 | } | |
469 | fat_attach(inode, i_pos); | |
470 | insert_inode_hash(inode); | |
471 | out: | |
472 | return inode; | |
473 | } | |
474 | ||
7c709d00 | 475 | EXPORT_SYMBOL_GPL(fat_build_inode); |
1da177e4 | 476 | |
deee3ce4 | 477 | static void fat_evict_inode(struct inode *inode) |
1da177e4 | 478 | { |
fef26658 | 479 | truncate_inode_pages(&inode->i_data, 0); |
deee3ce4 AV |
480 | if (!inode->i_nlink) { |
481 | inode->i_size = 0; | |
482 | fat_truncate_blocks(inode, 0); | |
483 | } | |
484 | invalidate_inode_buffers(inode); | |
dbd5768f | 485 | clear_inode(inode); |
1da177e4 | 486 | fat_cache_inval_inode(inode); |
a993b542 | 487 | fat_detach(inode); |
1da177e4 LT |
488 | } |
489 | ||
b88a1058 OR |
490 | static void fat_set_state(struct super_block *sb, |
491 | unsigned int set, unsigned int force) | |
492 | { | |
493 | struct buffer_head *bh; | |
494 | struct fat_boot_sector *b; | |
495 | struct msdos_sb_info *sbi = sb->s_fs_info; | |
496 | ||
497 | /* do not change any thing if mounted read only */ | |
498 | if ((sb->s_flags & MS_RDONLY) && !force) | |
499 | return; | |
500 | ||
501 | /* do not change state if fs was dirty */ | |
502 | if (sbi->dirty) { | |
503 | /* warn only on set (mount). */ | |
504 | if (set) | |
505 | fat_msg(sb, KERN_WARNING, "Volume was not properly " | |
506 | "unmounted. Some data may be corrupt. " | |
507 | "Please run fsck."); | |
508 | return; | |
509 | } | |
510 | ||
511 | bh = sb_bread(sb, 0); | |
512 | if (bh == NULL) { | |
513 | fat_msg(sb, KERN_ERR, "unable to read boot sector " | |
514 | "to mark fs as dirty"); | |
515 | return; | |
516 | } | |
517 | ||
518 | b = (struct fat_boot_sector *) bh->b_data; | |
519 | ||
520 | if (sbi->fat_bits == 32) { | |
521 | if (set) | |
522 | b->fat32.state |= FAT_STATE_DIRTY; | |
523 | else | |
524 | b->fat32.state &= ~FAT_STATE_DIRTY; | |
525 | } else /* fat 16 and 12 */ { | |
526 | if (set) | |
527 | b->fat16.state |= FAT_STATE_DIRTY; | |
528 | else | |
529 | b->fat16.state &= ~FAT_STATE_DIRTY; | |
530 | } | |
531 | ||
532 | mark_buffer_dirty(bh); | |
533 | sync_dirty_buffer(bh); | |
534 | brelse(bh); | |
535 | } | |
536 | ||
a6bf6b21 OH |
537 | static void fat_put_super(struct super_block *sb) |
538 | { | |
539 | struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
1da177e4 | 540 | |
b88a1058 OR |
541 | fat_set_state(sb, 0, 0); |
542 | ||
020ac5b6 | 543 | iput(sbi->fsinfo_inode); |
b522412a AV |
544 | iput(sbi->fat_inode); |
545 | ||
6d729e44 TG |
546 | unload_nls(sbi->nls_disk); |
547 | unload_nls(sbi->nls_io); | |
548 | ||
549 | if (sbi->options.iocharset != fat_default_iocharset) | |
1da177e4 | 550 | kfree(sbi->options.iocharset); |
1da177e4 LT |
551 | |
552 | sb->s_fs_info = NULL; | |
553 | kfree(sbi); | |
554 | } | |
555 | ||
e18b890b | 556 | static struct kmem_cache *fat_inode_cachep; |
1da177e4 LT |
557 | |
558 | static struct inode *fat_alloc_inode(struct super_block *sb) | |
559 | { | |
560 | struct msdos_inode_info *ei; | |
8f593427 | 561 | ei = kmem_cache_alloc(fat_inode_cachep, GFP_NOFS); |
1da177e4 LT |
562 | if (!ei) |
563 | return NULL; | |
58268691 CH |
564 | |
565 | init_rwsem(&ei->truncate_lock); | |
1da177e4 LT |
566 | return &ei->vfs_inode; |
567 | } | |
568 | ||
fa0d7e3d | 569 | static void fat_i_callback(struct rcu_head *head) |
1da177e4 | 570 | { |
fa0d7e3d | 571 | struct inode *inode = container_of(head, struct inode, i_rcu); |
1da177e4 LT |
572 | kmem_cache_free(fat_inode_cachep, MSDOS_I(inode)); |
573 | } | |
574 | ||
fa0d7e3d NP |
575 | static void fat_destroy_inode(struct inode *inode) |
576 | { | |
577 | call_rcu(&inode->i_rcu, fat_i_callback); | |
578 | } | |
579 | ||
51cc5068 | 580 | static void init_once(void *foo) |
1da177e4 LT |
581 | { |
582 | struct msdos_inode_info *ei = (struct msdos_inode_info *)foo; | |
583 | ||
a35afb83 CL |
584 | spin_lock_init(&ei->cache_lru_lock); |
585 | ei->nr_caches = 0; | |
586 | ei->cache_valid_id = FAT_CACHE_VALID + 1; | |
587 | INIT_LIST_HEAD(&ei->cache_lru); | |
588 | INIT_HLIST_NODE(&ei->i_fat_hash); | |
7669e8fb | 589 | INIT_HLIST_NODE(&ei->i_dir_hash); |
a35afb83 | 590 | inode_init_once(&ei->vfs_inode); |
1da177e4 LT |
591 | } |
592 | ||
593 | static int __init fat_init_inodecache(void) | |
594 | { | |
595 | fat_inode_cachep = kmem_cache_create("fat_inode_cache", | |
596 | sizeof(struct msdos_inode_info), | |
fffb60f9 PJ |
597 | 0, (SLAB_RECLAIM_ACCOUNT| |
598 | SLAB_MEM_SPREAD), | |
20c2df83 | 599 | init_once); |
1da177e4 LT |
600 | if (fat_inode_cachep == NULL) |
601 | return -ENOMEM; | |
602 | return 0; | |
603 | } | |
604 | ||
605 | static void __exit fat_destroy_inodecache(void) | |
606 | { | |
8c0a8537 KS |
607 | /* |
608 | * Make sure all delayed rcu free inodes are flushed before we | |
609 | * destroy cache. | |
610 | */ | |
611 | rcu_barrier(); | |
1a1d92c1 | 612 | kmem_cache_destroy(fat_inode_cachep); |
1da177e4 LT |
613 | } |
614 | ||
615 | static int fat_remount(struct super_block *sb, int *flags, char *data) | |
616 | { | |
b88a1058 | 617 | int new_rdonly; |
1da177e4 LT |
618 | struct msdos_sb_info *sbi = MSDOS_SB(sb); |
619 | *flags |= MS_NODIRATIME | (sbi->options.isvfat ? 0 : MS_NOATIME); | |
b88a1058 OR |
620 | |
621 | /* make sure we update state on remount. */ | |
622 | new_rdonly = *flags & MS_RDONLY; | |
623 | if (new_rdonly != (sb->s_flags & MS_RDONLY)) { | |
624 | if (new_rdonly) | |
625 | fat_set_state(sb, 0, 0); | |
626 | else | |
627 | fat_set_state(sb, 1, 1); | |
628 | } | |
1da177e4 LT |
629 | return 0; |
630 | } | |
631 | ||
726c3342 | 632 | static int fat_statfs(struct dentry *dentry, struct kstatfs *buf) |
1da177e4 | 633 | { |
aac49b75 CL |
634 | struct super_block *sb = dentry->d_sb; |
635 | struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
636 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); | |
1da177e4 LT |
637 | |
638 | /* If the count of free cluster is still unknown, counts it here. */ | |
606e423e | 639 | if (sbi->free_clusters == -1 || !sbi->free_clus_valid) { |
726c3342 | 640 | int err = fat_count_free_clusters(dentry->d_sb); |
1da177e4 LT |
641 | if (err) |
642 | return err; | |
643 | } | |
644 | ||
726c3342 | 645 | buf->f_type = dentry->d_sb->s_magic; |
1da177e4 LT |
646 | buf->f_bsize = sbi->cluster_size; |
647 | buf->f_blocks = sbi->max_cluster - FAT_START_ENT; | |
648 | buf->f_bfree = sbi->free_clusters; | |
649 | buf->f_bavail = sbi->free_clusters; | |
aac49b75 CL |
650 | buf->f_fsid.val[0] = (u32)id; |
651 | buf->f_fsid.val[1] = (u32)(id >> 32); | |
f68e542f OH |
652 | buf->f_namelen = |
653 | (sbi->options.isvfat ? FAT_LFN_LEN : 12) * NLS_MAX_CHARSET_SIZE; | |
1da177e4 LT |
654 | |
655 | return 0; | |
656 | } | |
657 | ||
7669e8fb SM |
658 | static inline loff_t fat_i_pos_read(struct msdos_sb_info *sbi, |
659 | struct inode *inode) | |
660 | { | |
661 | loff_t i_pos; | |
662 | #if BITS_PER_LONG == 32 | |
663 | spin_lock(&sbi->inode_hash_lock); | |
664 | #endif | |
665 | i_pos = MSDOS_I(inode)->i_pos; | |
666 | #if BITS_PER_LONG == 32 | |
667 | spin_unlock(&sbi->inode_hash_lock); | |
668 | #endif | |
669 | return i_pos; | |
670 | } | |
671 | ||
a9185b41 | 672 | static int __fat_write_inode(struct inode *inode, int wait) |
1da177e4 LT |
673 | { |
674 | struct super_block *sb = inode->i_sb; | |
675 | struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
676 | struct buffer_head *bh; | |
677 | struct msdos_dir_entry *raw_entry; | |
678 | loff_t i_pos; | |
5f22ca9b | 679 | int err; |
1da177e4 | 680 | |
9ca59f4c OH |
681 | if (inode->i_ino == MSDOS_ROOT_INO) |
682 | return 0; | |
683 | ||
1da177e4 | 684 | retry: |
9ca59f4c OH |
685 | i_pos = fat_i_pos_read(sbi, inode); |
686 | if (!i_pos) | |
1da177e4 LT |
687 | return 0; |
688 | ||
1da177e4 LT |
689 | bh = sb_bread(sb, i_pos >> sbi->dir_per_block_bits); |
690 | if (!bh) { | |
869f58c0 AF |
691 | fat_msg(sb, KERN_ERR, "unable to read inode block " |
692 | "for updating (i_pos %lld)", i_pos); | |
5f22ca9b | 693 | return -EIO; |
1da177e4 LT |
694 | } |
695 | spin_lock(&sbi->inode_hash_lock); | |
696 | if (i_pos != MSDOS_I(inode)->i_pos) { | |
697 | spin_unlock(&sbi->inode_hash_lock); | |
698 | brelse(bh); | |
1da177e4 LT |
699 | goto retry; |
700 | } | |
701 | ||
702 | raw_entry = &((struct msdos_dir_entry *) (bh->b_data)) | |
703 | [i_pos & (sbi->dir_per_block - 1)]; | |
704 | if (S_ISDIR(inode->i_mode)) | |
705 | raw_entry->size = 0; | |
706 | else | |
707 | raw_entry->size = cpu_to_le32(inode->i_size); | |
9c0aa1b8 | 708 | raw_entry->attr = fat_make_attrs(inode); |
a943ed71 | 709 | fat_set_start(raw_entry, MSDOS_I(inode)->i_logstart); |
7decd1cb OH |
710 | fat_time_unix2fat(sbi, &inode->i_mtime, &raw_entry->time, |
711 | &raw_entry->date, NULL); | |
1da177e4 | 712 | if (sbi->options.isvfat) { |
62a36c43 | 713 | __le16 atime; |
7decd1cb OH |
714 | fat_time_unix2fat(sbi, &inode->i_ctime, &raw_entry->ctime, |
715 | &raw_entry->cdate, &raw_entry->ctime_cs); | |
716 | fat_time_unix2fat(sbi, &inode->i_atime, &atime, | |
717 | &raw_entry->adate, NULL); | |
1da177e4 LT |
718 | } |
719 | spin_unlock(&sbi->inode_hash_lock); | |
720 | mark_buffer_dirty(bh); | |
5f22ca9b | 721 | err = 0; |
1da177e4 LT |
722 | if (wait) |
723 | err = sync_dirty_buffer(bh); | |
724 | brelse(bh); | |
1da177e4 LT |
725 | return err; |
726 | } | |
727 | ||
a9185b41 CH |
728 | static int fat_write_inode(struct inode *inode, struct writeback_control *wbc) |
729 | { | |
78491189 AB |
730 | int err; |
731 | ||
732 | if (inode->i_ino == MSDOS_FSINFO_INO) { | |
733 | struct super_block *sb = inode->i_sb; | |
734 | ||
e40b34c7 | 735 | mutex_lock(&MSDOS_SB(sb)->s_lock); |
78491189 | 736 | err = fat_clusters_flush(sb); |
e40b34c7 | 737 | mutex_unlock(&MSDOS_SB(sb)->s_lock); |
78491189 AB |
738 | } else |
739 | err = __fat_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL); | |
740 | ||
741 | return err; | |
a9185b41 CH |
742 | } |
743 | ||
1da177e4 LT |
744 | int fat_sync_inode(struct inode *inode) |
745 | { | |
a9185b41 | 746 | return __fat_write_inode(inode, 1); |
1da177e4 LT |
747 | } |
748 | ||
7c709d00 | 749 | EXPORT_SYMBOL_GPL(fat_sync_inode); |
1da177e4 | 750 | |
34c80b1d | 751 | static int fat_show_options(struct seq_file *m, struct dentry *root); |
ee9b6d61 | 752 | static const struct super_operations fat_sops = { |
1da177e4 LT |
753 | .alloc_inode = fat_alloc_inode, |
754 | .destroy_inode = fat_destroy_inode, | |
755 | .write_inode = fat_write_inode, | |
deee3ce4 | 756 | .evict_inode = fat_evict_inode, |
1da177e4 LT |
757 | .put_super = fat_put_super, |
758 | .statfs = fat_statfs, | |
1da177e4 LT |
759 | .remount_fs = fat_remount, |
760 | ||
1da177e4 LT |
761 | .show_options = fat_show_options, |
762 | }; | |
763 | ||
39655164 | 764 | static const struct export_operations fat_export_ops = { |
1305edad | 765 | .fh_to_dentry = fat_fh_to_dentry, |
7669e8fb | 766 | .fh_to_parent = fat_fh_to_parent, |
1da177e4 LT |
767 | .get_parent = fat_get_parent, |
768 | }; | |
769 | ||
34c80b1d | 770 | static int fat_show_options(struct seq_file *m, struct dentry *root) |
1da177e4 | 771 | { |
34c80b1d | 772 | struct msdos_sb_info *sbi = MSDOS_SB(root->d_sb); |
1da177e4 LT |
773 | struct fat_mount_options *opts = &sbi->options; |
774 | int isvfat = opts->isvfat; | |
775 | ||
170782eb EB |
776 | if (!uid_eq(opts->fs_uid, GLOBAL_ROOT_UID)) |
777 | seq_printf(m, ",uid=%u", | |
778 | from_kuid_munged(&init_user_ns, opts->fs_uid)); | |
779 | if (!gid_eq(opts->fs_gid, GLOBAL_ROOT_GID)) | |
780 | seq_printf(m, ",gid=%u", | |
781 | from_kgid_munged(&init_user_ns, opts->fs_gid)); | |
1da177e4 LT |
782 | seq_printf(m, ",fmask=%04o", opts->fs_fmask); |
783 | seq_printf(m, ",dmask=%04o", opts->fs_dmask); | |
1ae43f82 OH |
784 | if (opts->allow_utime) |
785 | seq_printf(m, ",allow_utime=%04o", opts->allow_utime); | |
1da177e4 | 786 | if (sbi->nls_disk) |
c6c20372 DR |
787 | /* strip "cp" prefix from displayed option */ |
788 | seq_printf(m, ",codepage=%s", &sbi->nls_disk->charset[2]); | |
1da177e4 LT |
789 | if (isvfat) { |
790 | if (sbi->nls_io) | |
791 | seq_printf(m, ",iocharset=%s", sbi->nls_io->charset); | |
792 | ||
793 | switch (opts->shortname) { | |
794 | case VFAT_SFN_DISPLAY_WIN95 | VFAT_SFN_CREATE_WIN95: | |
795 | seq_puts(m, ",shortname=win95"); | |
796 | break; | |
797 | case VFAT_SFN_DISPLAY_WINNT | VFAT_SFN_CREATE_WINNT: | |
798 | seq_puts(m, ",shortname=winnt"); | |
799 | break; | |
800 | case VFAT_SFN_DISPLAY_WINNT | VFAT_SFN_CREATE_WIN95: | |
801 | seq_puts(m, ",shortname=mixed"); | |
802 | break; | |
803 | case VFAT_SFN_DISPLAY_LOWER | VFAT_SFN_CREATE_WIN95: | |
95523475 | 804 | seq_puts(m, ",shortname=lower"); |
1da177e4 LT |
805 | break; |
806 | default: | |
807 | seq_puts(m, ",shortname=unknown"); | |
808 | break; | |
809 | } | |
810 | } | |
811 | if (opts->name_check != 'n') | |
812 | seq_printf(m, ",check=%c", opts->name_check); | |
28ec039c OH |
813 | if (opts->usefree) |
814 | seq_puts(m, ",usefree"); | |
1da177e4 LT |
815 | if (opts->quiet) |
816 | seq_puts(m, ",quiet"); | |
7669e8fb SM |
817 | if (opts->nfs) |
818 | seq_puts(m, ",nfs"); | |
1da177e4 LT |
819 | if (opts->showexec) |
820 | seq_puts(m, ",showexec"); | |
821 | if (opts->sys_immutable) | |
822 | seq_puts(m, ",sys_immutable"); | |
823 | if (!isvfat) { | |
824 | if (opts->dotsOK) | |
825 | seq_puts(m, ",dotsOK=yes"); | |
826 | if (opts->nocase) | |
827 | seq_puts(m, ",nocase"); | |
828 | } else { | |
829 | if (opts->utf8) | |
830 | seq_puts(m, ",utf8"); | |
831 | if (opts->unicode_xlate) | |
832 | seq_puts(m, ",uni_xlate"); | |
833 | if (!opts->numtail) | |
834 | seq_puts(m, ",nonumtail"); | |
dfc209c0 OH |
835 | if (opts->rodir) |
836 | seq_puts(m, ",rodir"); | |
1da177e4 | 837 | } |
dfc209c0 | 838 | if (opts->flush) |
c1fca3b6 | 839 | seq_puts(m, ",flush"); |
58156c8f JK |
840 | if (opts->tz_set) { |
841 | if (opts->time_offset) | |
842 | seq_printf(m, ",time_offset=%d", opts->time_offset); | |
843 | else | |
844 | seq_puts(m, ",tz=UTC"); | |
845 | } | |
85c78591 DK |
846 | if (opts->errors == FAT_ERRORS_CONT) |
847 | seq_puts(m, ",errors=continue"); | |
848 | else if (opts->errors == FAT_ERRORS_PANIC) | |
849 | seq_puts(m, ",errors=panic"); | |
850 | else | |
851 | seq_puts(m, ",errors=remount-ro"); | |
681142f9 CH |
852 | if (opts->discard) |
853 | seq_puts(m, ",discard"); | |
1da177e4 LT |
854 | |
855 | return 0; | |
856 | } | |
857 | ||
858 | enum { | |
859 | Opt_check_n, Opt_check_r, Opt_check_s, Opt_uid, Opt_gid, | |
1ae43f82 OH |
860 | Opt_umask, Opt_dmask, Opt_fmask, Opt_allow_utime, Opt_codepage, |
861 | Opt_usefree, Opt_nocase, Opt_quiet, Opt_showexec, Opt_debug, | |
862 | Opt_immutable, Opt_dots, Opt_nodots, | |
1da177e4 LT |
863 | Opt_charset, Opt_shortname_lower, Opt_shortname_win95, |
864 | Opt_shortname_winnt, Opt_shortname_mixed, Opt_utf8_no, Opt_utf8_yes, | |
865 | Opt_uni_xl_no, Opt_uni_xl_yes, Opt_nonumtail_no, Opt_nonumtail_yes, | |
d7a83c0f | 866 | Opt_obsolete, Opt_flush, Opt_tz_utc, Opt_rodir, Opt_err_cont, |
58156c8f JK |
867 | Opt_err_panic, Opt_err_ro, Opt_discard, Opt_nfs, Opt_time_offset, |
868 | Opt_err, | |
1da177e4 LT |
869 | }; |
870 | ||
a447c093 | 871 | static const match_table_t fat_tokens = { |
1da177e4 LT |
872 | {Opt_check_r, "check=relaxed"}, |
873 | {Opt_check_s, "check=strict"}, | |
874 | {Opt_check_n, "check=normal"}, | |
875 | {Opt_check_r, "check=r"}, | |
876 | {Opt_check_s, "check=s"}, | |
877 | {Opt_check_n, "check=n"}, | |
878 | {Opt_uid, "uid=%u"}, | |
879 | {Opt_gid, "gid=%u"}, | |
880 | {Opt_umask, "umask=%o"}, | |
881 | {Opt_dmask, "dmask=%o"}, | |
882 | {Opt_fmask, "fmask=%o"}, | |
1ae43f82 | 883 | {Opt_allow_utime, "allow_utime=%o"}, |
1da177e4 | 884 | {Opt_codepage, "codepage=%u"}, |
28ec039c | 885 | {Opt_usefree, "usefree"}, |
1da177e4 LT |
886 | {Opt_nocase, "nocase"}, |
887 | {Opt_quiet, "quiet"}, | |
888 | {Opt_showexec, "showexec"}, | |
889 | {Opt_debug, "debug"}, | |
890 | {Opt_immutable, "sys_immutable"}, | |
85c78591 DK |
891 | {Opt_flush, "flush"}, |
892 | {Opt_tz_utc, "tz=UTC"}, | |
58156c8f | 893 | {Opt_time_offset, "time_offset=%d"}, |
85c78591 DK |
894 | {Opt_err_cont, "errors=continue"}, |
895 | {Opt_err_panic, "errors=panic"}, | |
896 | {Opt_err_ro, "errors=remount-ro"}, | |
681142f9 | 897 | {Opt_discard, "discard"}, |
7669e8fb | 898 | {Opt_nfs, "nfs"}, |
d7a83c0f GU |
899 | {Opt_obsolete, "conv=binary"}, |
900 | {Opt_obsolete, "conv=text"}, | |
901 | {Opt_obsolete, "conv=auto"}, | |
902 | {Opt_obsolete, "conv=b"}, | |
903 | {Opt_obsolete, "conv=t"}, | |
904 | {Opt_obsolete, "conv=a"}, | |
905 | {Opt_obsolete, "fat=%u"}, | |
906 | {Opt_obsolete, "blocksize=%u"}, | |
907 | {Opt_obsolete, "cvf_format=%20s"}, | |
908 | {Opt_obsolete, "cvf_options=%100s"}, | |
909 | {Opt_obsolete, "posix"}, | |
ae78bf9c | 910 | {Opt_err, NULL}, |
1da177e4 | 911 | }; |
a447c093 | 912 | static const match_table_t msdos_tokens = { |
1da177e4 LT |
913 | {Opt_nodots, "nodots"}, |
914 | {Opt_nodots, "dotsOK=no"}, | |
915 | {Opt_dots, "dots"}, | |
916 | {Opt_dots, "dotsOK=yes"}, | |
917 | {Opt_err, NULL} | |
918 | }; | |
a447c093 | 919 | static const match_table_t vfat_tokens = { |
1da177e4 LT |
920 | {Opt_charset, "iocharset=%s"}, |
921 | {Opt_shortname_lower, "shortname=lower"}, | |
922 | {Opt_shortname_win95, "shortname=win95"}, | |
923 | {Opt_shortname_winnt, "shortname=winnt"}, | |
924 | {Opt_shortname_mixed, "shortname=mixed"}, | |
925 | {Opt_utf8_no, "utf8=0"}, /* 0 or no or false */ | |
926 | {Opt_utf8_no, "utf8=no"}, | |
927 | {Opt_utf8_no, "utf8=false"}, | |
928 | {Opt_utf8_yes, "utf8=1"}, /* empty or 1 or yes or true */ | |
929 | {Opt_utf8_yes, "utf8=yes"}, | |
930 | {Opt_utf8_yes, "utf8=true"}, | |
931 | {Opt_utf8_yes, "utf8"}, | |
932 | {Opt_uni_xl_no, "uni_xlate=0"}, /* 0 or no or false */ | |
933 | {Opt_uni_xl_no, "uni_xlate=no"}, | |
934 | {Opt_uni_xl_no, "uni_xlate=false"}, | |
935 | {Opt_uni_xl_yes, "uni_xlate=1"}, /* empty or 1 or yes or true */ | |
936 | {Opt_uni_xl_yes, "uni_xlate=yes"}, | |
937 | {Opt_uni_xl_yes, "uni_xlate=true"}, | |
938 | {Opt_uni_xl_yes, "uni_xlate"}, | |
939 | {Opt_nonumtail_no, "nonumtail=0"}, /* 0 or no or false */ | |
940 | {Opt_nonumtail_no, "nonumtail=no"}, | |
941 | {Opt_nonumtail_no, "nonumtail=false"}, | |
942 | {Opt_nonumtail_yes, "nonumtail=1"}, /* empty or 1 or yes or true */ | |
943 | {Opt_nonumtail_yes, "nonumtail=yes"}, | |
944 | {Opt_nonumtail_yes, "nonumtail=true"}, | |
945 | {Opt_nonumtail_yes, "nonumtail"}, | |
dfc209c0 | 946 | {Opt_rodir, "rodir"}, |
1da177e4 LT |
947 | {Opt_err, NULL} |
948 | }; | |
949 | ||
869f58c0 AF |
950 | static int parse_options(struct super_block *sb, char *options, int is_vfat, |
951 | int silent, int *debug, struct fat_mount_options *opts) | |
1da177e4 LT |
952 | { |
953 | char *p; | |
954 | substring_t args[MAX_OPT_ARGS]; | |
955 | int option; | |
956 | char *iocharset; | |
957 | ||
958 | opts->isvfat = is_vfat; | |
959 | ||
f0ce7ee3 DH |
960 | opts->fs_uid = current_uid(); |
961 | opts->fs_gid = current_gid(); | |
3e107603 | 962 | opts->fs_fmask = opts->fs_dmask = current_umask(); |
1ae43f82 | 963 | opts->allow_utime = -1; |
1da177e4 LT |
964 | opts->codepage = fat_default_codepage; |
965 | opts->iocharset = fat_default_iocharset; | |
dfc209c0 | 966 | if (is_vfat) { |
95523475 | 967 | opts->shortname = VFAT_SFN_DISPLAY_WINNT|VFAT_SFN_CREATE_WIN95; |
dfc209c0 OH |
968 | opts->rodir = 0; |
969 | } else { | |
1da177e4 | 970 | opts->shortname = 0; |
dfc209c0 OH |
971 | opts->rodir = 1; |
972 | } | |
1da177e4 LT |
973 | opts->name_check = 'n'; |
974 | opts->quiet = opts->showexec = opts->sys_immutable = opts->dotsOK = 0; | |
975 | opts->utf8 = opts->unicode_xlate = 0; | |
976 | opts->numtail = 1; | |
28ec039c | 977 | opts->usefree = opts->nocase = 0; |
58156c8f | 978 | opts->tz_set = 0; |
7669e8fb | 979 | opts->nfs = 0; |
85c78591 | 980 | opts->errors = FAT_ERRORS_RO; |
1da177e4 LT |
981 | *debug = 0; |
982 | ||
983 | if (!options) | |
8d44d974 | 984 | goto out; |
1da177e4 LT |
985 | |
986 | while ((p = strsep(&options, ",")) != NULL) { | |
987 | int token; | |
988 | if (!*p) | |
989 | continue; | |
990 | ||
991 | token = match_token(p, fat_tokens, args); | |
992 | if (token == Opt_err) { | |
993 | if (is_vfat) | |
994 | token = match_token(p, vfat_tokens, args); | |
995 | else | |
996 | token = match_token(p, msdos_tokens, args); | |
997 | } | |
998 | switch (token) { | |
999 | case Opt_check_s: | |
1000 | opts->name_check = 's'; | |
1001 | break; | |
1002 | case Opt_check_r: | |
1003 | opts->name_check = 'r'; | |
1004 | break; | |
1005 | case Opt_check_n: | |
1006 | opts->name_check = 'n'; | |
1007 | break; | |
28ec039c OH |
1008 | case Opt_usefree: |
1009 | opts->usefree = 1; | |
1010 | break; | |
1da177e4 LT |
1011 | case Opt_nocase: |
1012 | if (!is_vfat) | |
1013 | opts->nocase = 1; | |
1014 | else { | |
1015 | /* for backward compatibility */ | |
1016 | opts->shortname = VFAT_SFN_DISPLAY_WIN95 | |
1017 | | VFAT_SFN_CREATE_WIN95; | |
1018 | } | |
1019 | break; | |
1020 | case Opt_quiet: | |
1021 | opts->quiet = 1; | |
1022 | break; | |
1023 | case Opt_showexec: | |
1024 | opts->showexec = 1; | |
1025 | break; | |
1026 | case Opt_debug: | |
1027 | *debug = 1; | |
1028 | break; | |
1029 | case Opt_immutable: | |
1030 | opts->sys_immutable = 1; | |
1031 | break; | |
1032 | case Opt_uid: | |
1033 | if (match_int(&args[0], &option)) | |
5b3d5aea | 1034 | return -EINVAL; |
170782eb EB |
1035 | opts->fs_uid = make_kuid(current_user_ns(), option); |
1036 | if (!uid_valid(opts->fs_uid)) | |
5b3d5aea | 1037 | return -EINVAL; |
1da177e4 LT |
1038 | break; |
1039 | case Opt_gid: | |
1040 | if (match_int(&args[0], &option)) | |
5b3d5aea | 1041 | return -EINVAL; |
170782eb EB |
1042 | opts->fs_gid = make_kgid(current_user_ns(), option); |
1043 | if (!gid_valid(opts->fs_gid)) | |
5b3d5aea | 1044 | return -EINVAL; |
1da177e4 LT |
1045 | break; |
1046 | case Opt_umask: | |
1047 | if (match_octal(&args[0], &option)) | |
5b3d5aea | 1048 | return -EINVAL; |
1da177e4 LT |
1049 | opts->fs_fmask = opts->fs_dmask = option; |
1050 | break; | |
1051 | case Opt_dmask: | |
1052 | if (match_octal(&args[0], &option)) | |
5b3d5aea | 1053 | return -EINVAL; |
1da177e4 LT |
1054 | opts->fs_dmask = option; |
1055 | break; | |
1056 | case Opt_fmask: | |
1057 | if (match_octal(&args[0], &option)) | |
5b3d5aea | 1058 | return -EINVAL; |
1da177e4 LT |
1059 | opts->fs_fmask = option; |
1060 | break; | |
1ae43f82 OH |
1061 | case Opt_allow_utime: |
1062 | if (match_octal(&args[0], &option)) | |
5b3d5aea | 1063 | return -EINVAL; |
1ae43f82 OH |
1064 | opts->allow_utime = option & (S_IWGRP | S_IWOTH); |
1065 | break; | |
1da177e4 LT |
1066 | case Opt_codepage: |
1067 | if (match_int(&args[0], &option)) | |
5b3d5aea | 1068 | return -EINVAL; |
1da177e4 LT |
1069 | opts->codepage = option; |
1070 | break; | |
ae78bf9c CM |
1071 | case Opt_flush: |
1072 | opts->flush = 1; | |
1073 | break; | |
58156c8f JK |
1074 | case Opt_time_offset: |
1075 | if (match_int(&args[0], &option)) | |
5b3d5aea | 1076 | return -EINVAL; |
58156c8f | 1077 | if (option < -12 * 60 || option > 12 * 60) |
5b3d5aea | 1078 | return -EINVAL; |
58156c8f JK |
1079 | opts->tz_set = 1; |
1080 | opts->time_offset = option; | |
1081 | break; | |
b271e067 | 1082 | case Opt_tz_utc: |
58156c8f JK |
1083 | opts->tz_set = 1; |
1084 | opts->time_offset = 0; | |
b271e067 | 1085 | break; |
85c78591 DK |
1086 | case Opt_err_cont: |
1087 | opts->errors = FAT_ERRORS_CONT; | |
1088 | break; | |
1089 | case Opt_err_panic: | |
1090 | opts->errors = FAT_ERRORS_PANIC; | |
1091 | break; | |
1092 | case Opt_err_ro: | |
1093 | opts->errors = FAT_ERRORS_RO; | |
1094 | break; | |
1da177e4 LT |
1095 | |
1096 | /* msdos specific */ | |
1097 | case Opt_dots: | |
1098 | opts->dotsOK = 1; | |
1099 | break; | |
1100 | case Opt_nodots: | |
1101 | opts->dotsOK = 0; | |
1102 | break; | |
1103 | ||
1104 | /* vfat specific */ | |
1105 | case Opt_charset: | |
1106 | if (opts->iocharset != fat_default_iocharset) | |
1107 | kfree(opts->iocharset); | |
1108 | iocharset = match_strdup(&args[0]); | |
1109 | if (!iocharset) | |
1110 | return -ENOMEM; | |
1111 | opts->iocharset = iocharset; | |
1112 | break; | |
1113 | case Opt_shortname_lower: | |
1114 | opts->shortname = VFAT_SFN_DISPLAY_LOWER | |
1115 | | VFAT_SFN_CREATE_WIN95; | |
1116 | break; | |
1117 | case Opt_shortname_win95: | |
1118 | opts->shortname = VFAT_SFN_DISPLAY_WIN95 | |
1119 | | VFAT_SFN_CREATE_WIN95; | |
1120 | break; | |
1121 | case Opt_shortname_winnt: | |
1122 | opts->shortname = VFAT_SFN_DISPLAY_WINNT | |
1123 | | VFAT_SFN_CREATE_WINNT; | |
1124 | break; | |
1125 | case Opt_shortname_mixed: | |
1126 | opts->shortname = VFAT_SFN_DISPLAY_WINNT | |
1127 | | VFAT_SFN_CREATE_WIN95; | |
1128 | break; | |
1129 | case Opt_utf8_no: /* 0 or no or false */ | |
1130 | opts->utf8 = 0; | |
1131 | break; | |
1132 | case Opt_utf8_yes: /* empty or 1 or yes or true */ | |
1133 | opts->utf8 = 1; | |
1134 | break; | |
1135 | case Opt_uni_xl_no: /* 0 or no or false */ | |
1136 | opts->unicode_xlate = 0; | |
1137 | break; | |
1138 | case Opt_uni_xl_yes: /* empty or 1 or yes or true */ | |
1139 | opts->unicode_xlate = 1; | |
1140 | break; | |
1141 | case Opt_nonumtail_no: /* 0 or no or false */ | |
1142 | opts->numtail = 1; /* negated option */ | |
1143 | break; | |
1144 | case Opt_nonumtail_yes: /* empty or 1 or yes or true */ | |
1145 | opts->numtail = 0; /* negated option */ | |
1146 | break; | |
dfc209c0 OH |
1147 | case Opt_rodir: |
1148 | opts->rodir = 1; | |
1149 | break; | |
681142f9 CH |
1150 | case Opt_discard: |
1151 | opts->discard = 1; | |
1152 | break; | |
7669e8fb SM |
1153 | case Opt_nfs: |
1154 | opts->nfs = 1; | |
1155 | break; | |
1da177e4 LT |
1156 | |
1157 | /* obsolete mount options */ | |
d7a83c0f | 1158 | case Opt_obsolete: |
869f58c0 AF |
1159 | fat_msg(sb, KERN_INFO, "\"%s\" option is obsolete, " |
1160 | "not supported now", p); | |
1da177e4 LT |
1161 | break; |
1162 | /* unknown option */ | |
1163 | default: | |
41a34a4f | 1164 | if (!silent) { |
869f58c0 AF |
1165 | fat_msg(sb, KERN_ERR, |
1166 | "Unrecognized mount option \"%s\" " | |
1167 | "or missing value", p); | |
41a34a4f | 1168 | } |
1da177e4 LT |
1169 | return -EINVAL; |
1170 | } | |
1171 | } | |
8d44d974 OH |
1172 | |
1173 | out: | |
4de151d8 | 1174 | /* UTF-8 doesn't provide FAT semantics */ |
1da177e4 | 1175 | if (!strcmp(opts->iocharset, "utf8")) { |
186b5370 | 1176 | fat_msg(sb, KERN_WARNING, "utf8 is not a recommended IO charset" |
8d44d974 | 1177 | " for FAT filesystems, filesystem will be " |
186b5370 | 1178 | "case sensitive!"); |
1da177e4 LT |
1179 | } |
1180 | ||
1ae43f82 OH |
1181 | /* If user doesn't specify allow_utime, it's initialized from dmask. */ |
1182 | if (opts->allow_utime == (unsigned short)-1) | |
1183 | opts->allow_utime = ~opts->fs_dmask & (S_IWGRP | S_IWOTH); | |
1da177e4 LT |
1184 | if (opts->unicode_xlate) |
1185 | opts->utf8 = 0; | |
1186 | ||
1187 | return 0; | |
1188 | } | |
1189 | ||
1190 | static int fat_read_root(struct inode *inode) | |
1191 | { | |
1192 | struct super_block *sb = inode->i_sb; | |
1193 | struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
1194 | int error; | |
1195 | ||
1196 | MSDOS_I(inode)->i_pos = 0; | |
1197 | inode->i_uid = sbi->options.fs_uid; | |
1198 | inode->i_gid = sbi->options.fs_gid; | |
1199 | inode->i_version++; | |
1200 | inode->i_generation = 0; | |
9c0aa1b8 | 1201 | inode->i_mode = fat_make_mode(sbi, ATTR_DIR, S_IRWXUGO); |
1da177e4 LT |
1202 | inode->i_op = sbi->dir_ops; |
1203 | inode->i_fop = &fat_dir_operations; | |
1204 | if (sbi->fat_bits == 32) { | |
1205 | MSDOS_I(inode)->i_start = sbi->root_cluster; | |
1206 | error = fat_calc_dir_size(inode); | |
1207 | if (error < 0) | |
1208 | return error; | |
1209 | } else { | |
1210 | MSDOS_I(inode)->i_start = 0; | |
1211 | inode->i_size = sbi->dir_entries * sizeof(struct msdos_dir_entry); | |
1212 | } | |
1da177e4 LT |
1213 | inode->i_blocks = ((inode->i_size + (sbi->cluster_size - 1)) |
1214 | & ~((loff_t)sbi->cluster_size - 1)) >> 9; | |
1215 | MSDOS_I(inode)->i_logstart = 0; | |
1216 | MSDOS_I(inode)->mmu_private = inode->i_size; | |
1217 | ||
9c0aa1b8 | 1218 | fat_save_attrs(inode, ATTR_DIR); |
1da177e4 LT |
1219 | inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = 0; |
1220 | inode->i_mtime.tv_nsec = inode->i_atime.tv_nsec = inode->i_ctime.tv_nsec = 0; | |
bfe86848 | 1221 | set_nlink(inode, fat_subdirs(inode)+2); |
1da177e4 LT |
1222 | |
1223 | return 0; | |
1224 | } | |
1225 | ||
1226 | /* | |
1227 | * Read the super block of an MS-DOS FS. | |
1228 | */ | |
384f5c96 | 1229 | int fat_fill_super(struct super_block *sb, void *data, int silent, int isvfat, |
3d23985d | 1230 | void (*setup)(struct super_block *)) |
1da177e4 | 1231 | { |
b522412a | 1232 | struct inode *root_inode = NULL, *fat_inode = NULL; |
020ac5b6 | 1233 | struct inode *fsinfo_inode = NULL; |
1da177e4 LT |
1234 | struct buffer_head *bh; |
1235 | struct fat_boot_sector *b; | |
1236 | struct msdos_sb_info *sbi; | |
1237 | u16 logical_sector_size; | |
1238 | u32 total_sectors, total_clusters, fat_clusters, rootdir_sectors; | |
1239 | int debug; | |
1240 | unsigned int media; | |
1241 | long error; | |
1242 | char buf[50]; | |
1243 | ||
8f593427 LT |
1244 | /* |
1245 | * GFP_KERNEL is ok here, because while we do hold the | |
1246 | * supeblock lock, memory pressure can't call back into | |
1247 | * the filesystem, since we're only just about to mount | |
1248 | * it and have no inodes etc active! | |
1249 | */ | |
f8314dc6 | 1250 | sbi = kzalloc(sizeof(struct msdos_sb_info), GFP_KERNEL); |
1da177e4 LT |
1251 | if (!sbi) |
1252 | return -ENOMEM; | |
1253 | sb->s_fs_info = sbi; | |
1da177e4 LT |
1254 | |
1255 | sb->s_flags |= MS_NODIRATIME; | |
1256 | sb->s_magic = MSDOS_SUPER_MAGIC; | |
1257 | sb->s_op = &fat_sops; | |
1258 | sb->s_export_op = &fat_export_ops; | |
aaa04b48 OH |
1259 | ratelimit_state_init(&sbi->ratelimit, DEFAULT_RATELIMIT_INTERVAL, |
1260 | DEFAULT_RATELIMIT_BURST); | |
1da177e4 | 1261 | |
869f58c0 | 1262 | error = parse_options(sb, data, isvfat, silent, &debug, &sbi->options); |
1da177e4 LT |
1263 | if (error) |
1264 | goto out_fail; | |
1265 | ||
3d23985d AV |
1266 | setup(sb); /* flavour-specific stuff that needs options */ |
1267 | ||
1da177e4 LT |
1268 | error = -EIO; |
1269 | sb_min_blocksize(sb, 512); | |
1270 | bh = sb_bread(sb, 0); | |
1271 | if (bh == NULL) { | |
869f58c0 | 1272 | fat_msg(sb, KERN_ERR, "unable to read boot sector"); |
1da177e4 LT |
1273 | goto out_fail; |
1274 | } | |
1275 | ||
1276 | b = (struct fat_boot_sector *) bh->b_data; | |
1277 | if (!b->reserved) { | |
1278 | if (!silent) | |
869f58c0 | 1279 | fat_msg(sb, KERN_ERR, "bogus number of reserved sectors"); |
1da177e4 LT |
1280 | brelse(bh); |
1281 | goto out_invalid; | |
1282 | } | |
1283 | if (!b->fats) { | |
1284 | if (!silent) | |
869f58c0 | 1285 | fat_msg(sb, KERN_ERR, "bogus number of FAT structure"); |
1da177e4 LT |
1286 | brelse(bh); |
1287 | goto out_invalid; | |
1288 | } | |
1289 | ||
1290 | /* | |
1291 | * Earlier we checked here that b->secs_track and b->head are nonzero, | |
1292 | * but it turns out valid FAT filesystems can have zero there. | |
1293 | */ | |
1294 | ||
1295 | media = b->media; | |
73f20e58 | 1296 | if (!fat_valid_media(media)) { |
1da177e4 | 1297 | if (!silent) |
869f58c0 | 1298 | fat_msg(sb, KERN_ERR, "invalid media value (0x%02x)", |
1da177e4 LT |
1299 | media); |
1300 | brelse(bh); | |
1301 | goto out_invalid; | |
1302 | } | |
803f445f | 1303 | logical_sector_size = get_unaligned_le16(&b->sector_size); |
e7d709c0 | 1304 | if (!is_power_of_2(logical_sector_size) |
1da177e4 | 1305 | || (logical_sector_size < 512) |
9f354858 | 1306 | || (logical_sector_size > 4096)) { |
1da177e4 | 1307 | if (!silent) |
869f58c0 | 1308 | fat_msg(sb, KERN_ERR, "bogus logical sector size %u", |
1da177e4 LT |
1309 | logical_sector_size); |
1310 | brelse(bh); | |
1311 | goto out_invalid; | |
1312 | } | |
1313 | sbi->sec_per_clus = b->sec_per_clus; | |
e7d709c0 | 1314 | if (!is_power_of_2(sbi->sec_per_clus)) { |
1da177e4 | 1315 | if (!silent) |
869f58c0 | 1316 | fat_msg(sb, KERN_ERR, "bogus sectors per cluster %u", |
1da177e4 LT |
1317 | sbi->sec_per_clus); |
1318 | brelse(bh); | |
1319 | goto out_invalid; | |
1320 | } | |
1321 | ||
1322 | if (logical_sector_size < sb->s_blocksize) { | |
869f58c0 AF |
1323 | fat_msg(sb, KERN_ERR, "logical sector size too small for device" |
1324 | " (logical sector size = %u)", logical_sector_size); | |
1da177e4 LT |
1325 | brelse(bh); |
1326 | goto out_fail; | |
1327 | } | |
1328 | if (logical_sector_size > sb->s_blocksize) { | |
1329 | brelse(bh); | |
1330 | ||
1331 | if (!sb_set_blocksize(sb, logical_sector_size)) { | |
869f58c0 | 1332 | fat_msg(sb, KERN_ERR, "unable to set blocksize %u", |
1da177e4 LT |
1333 | logical_sector_size); |
1334 | goto out_fail; | |
1335 | } | |
1336 | bh = sb_bread(sb, 0); | |
1337 | if (bh == NULL) { | |
869f58c0 AF |
1338 | fat_msg(sb, KERN_ERR, "unable to read boot sector" |
1339 | " (logical sector size = %lu)", | |
1da177e4 LT |
1340 | sb->s_blocksize); |
1341 | goto out_fail; | |
1342 | } | |
1343 | b = (struct fat_boot_sector *) bh->b_data; | |
1344 | } | |
1345 | ||
e40b34c7 | 1346 | mutex_init(&sbi->s_lock); |
1da177e4 LT |
1347 | sbi->cluster_size = sb->s_blocksize * sbi->sec_per_clus; |
1348 | sbi->cluster_bits = ffs(sbi->cluster_size) - 1; | |
1349 | sbi->fats = b->fats; | |
1350 | sbi->fat_bits = 0; /* Don't know yet */ | |
1351 | sbi->fat_start = le16_to_cpu(b->reserved); | |
1352 | sbi->fat_length = le16_to_cpu(b->fat_length); | |
1353 | sbi->root_cluster = 0; | |
1354 | sbi->free_clusters = -1; /* Don't know yet */ | |
606e423e | 1355 | sbi->free_clus_valid = 0; |
1da177e4 | 1356 | sbi->prev_free = FAT_START_ENT; |
710d4403 | 1357 | sb->s_maxbytes = 0xffffffff; |
1da177e4 | 1358 | |
6b46419b | 1359 | if (!sbi->fat_length && b->fat32.length) { |
1da177e4 LT |
1360 | struct fat_boot_fsinfo *fsinfo; |
1361 | struct buffer_head *fsinfo_bh; | |
1362 | ||
1363 | /* Must be FAT32 */ | |
1364 | sbi->fat_bits = 32; | |
6b46419b OR |
1365 | sbi->fat_length = le32_to_cpu(b->fat32.length); |
1366 | sbi->root_cluster = le32_to_cpu(b->fat32.root_cluster); | |
1da177e4 | 1367 | |
1da177e4 | 1368 | /* MC - if info_sector is 0, don't multiply by 0 */ |
6b46419b | 1369 | sbi->fsinfo_sector = le16_to_cpu(b->fat32.info_sector); |
1da177e4 LT |
1370 | if (sbi->fsinfo_sector == 0) |
1371 | sbi->fsinfo_sector = 1; | |
1372 | ||
1373 | fsinfo_bh = sb_bread(sb, sbi->fsinfo_sector); | |
1374 | if (fsinfo_bh == NULL) { | |
869f58c0 AF |
1375 | fat_msg(sb, KERN_ERR, "bread failed, FSINFO block" |
1376 | " (sector = %lu)", sbi->fsinfo_sector); | |
1da177e4 LT |
1377 | brelse(bh); |
1378 | goto out_fail; | |
1379 | } | |
1380 | ||
1381 | fsinfo = (struct fat_boot_fsinfo *)fsinfo_bh->b_data; | |
1382 | if (!IS_FSINFO(fsinfo)) { | |
869f58c0 AF |
1383 | fat_msg(sb, KERN_WARNING, "Invalid FSINFO signature: " |
1384 | "0x%08x, 0x%08x (sector = %lu)", | |
1da177e4 LT |
1385 | le32_to_cpu(fsinfo->signature1), |
1386 | le32_to_cpu(fsinfo->signature2), | |
1387 | sbi->fsinfo_sector); | |
1388 | } else { | |
28ec039c | 1389 | if (sbi->options.usefree) |
606e423e OH |
1390 | sbi->free_clus_valid = 1; |
1391 | sbi->free_clusters = le32_to_cpu(fsinfo->free_clusters); | |
1da177e4 LT |
1392 | sbi->prev_free = le32_to_cpu(fsinfo->next_cluster); |
1393 | } | |
1394 | ||
1395 | brelse(fsinfo_bh); | |
1396 | } | |
1397 | ||
1398 | sbi->dir_per_block = sb->s_blocksize / sizeof(struct msdos_dir_entry); | |
1399 | sbi->dir_per_block_bits = ffs(sbi->dir_per_block) - 1; | |
1400 | ||
1401 | sbi->dir_start = sbi->fat_start + sbi->fats * sbi->fat_length; | |
803f445f | 1402 | sbi->dir_entries = get_unaligned_le16(&b->dir_entries); |
1da177e4 LT |
1403 | if (sbi->dir_entries & (sbi->dir_per_block - 1)) { |
1404 | if (!silent) | |
c39540c6 | 1405 | fat_msg(sb, KERN_ERR, "bogus directory-entries per block" |
869f58c0 | 1406 | " (%u)", sbi->dir_entries); |
1da177e4 LT |
1407 | brelse(bh); |
1408 | goto out_invalid; | |
1409 | } | |
1410 | ||
1411 | rootdir_sectors = sbi->dir_entries | |
1412 | * sizeof(struct msdos_dir_entry) / sb->s_blocksize; | |
1413 | sbi->data_start = sbi->dir_start + rootdir_sectors; | |
803f445f | 1414 | total_sectors = get_unaligned_le16(&b->sectors); |
1da177e4 LT |
1415 | if (total_sectors == 0) |
1416 | total_sectors = le32_to_cpu(b->total_sect); | |
1417 | ||
1418 | total_clusters = (total_sectors - sbi->data_start) / sbi->sec_per_clus; | |
1419 | ||
1420 | if (sbi->fat_bits != 32) | |
1421 | sbi->fat_bits = (total_clusters > MAX_FAT12) ? 16 : 12; | |
1422 | ||
b88a1058 OR |
1423 | /* some OSes set FAT_STATE_DIRTY and clean it on unmount. */ |
1424 | if (sbi->fat_bits == 32) | |
1425 | sbi->dirty = b->fat32.state & FAT_STATE_DIRTY; | |
1426 | else /* fat 16 or 12 */ | |
1427 | sbi->dirty = b->fat16.state & FAT_STATE_DIRTY; | |
1428 | ||
1da177e4 LT |
1429 | /* check that FAT table does not overflow */ |
1430 | fat_clusters = sbi->fat_length * sb->s_blocksize * 8 / sbi->fat_bits; | |
1431 | total_clusters = min(total_clusters, fat_clusters - FAT_START_ENT); | |
1432 | if (total_clusters > MAX_FAT(sb)) { | |
1433 | if (!silent) | |
869f58c0 | 1434 | fat_msg(sb, KERN_ERR, "count of clusters too big (%u)", |
1da177e4 LT |
1435 | total_clusters); |
1436 | brelse(bh); | |
1437 | goto out_invalid; | |
1438 | } | |
1439 | ||
1440 | sbi->max_cluster = total_clusters + FAT_START_ENT; | |
1441 | /* check the free_clusters, it's not necessarily correct */ | |
1442 | if (sbi->free_clusters != -1 && sbi->free_clusters > total_clusters) | |
1443 | sbi->free_clusters = -1; | |
1444 | /* check the prev_free, it's not necessarily correct */ | |
1445 | sbi->prev_free %= sbi->max_cluster; | |
1446 | if (sbi->prev_free < FAT_START_ENT) | |
1447 | sbi->prev_free = FAT_START_ENT; | |
1448 | ||
1449 | brelse(bh); | |
1450 | ||
1451 | /* set up enough so that it can read an inode */ | |
1452 | fat_hash_init(sb); | |
7669e8fb | 1453 | dir_hash_init(sb); |
1da177e4 LT |
1454 | fat_ent_access_init(sb); |
1455 | ||
1456 | /* | |
1457 | * The low byte of FAT's first entry must have same value with | |
1458 | * media-field. But in real world, too many devices is | |
1459 | * writing wrong value. So, removed that validity check. | |
1460 | * | |
1461 | * if (FAT_FIRST_ENT(sb, media) != first) | |
1462 | */ | |
1463 | ||
1464 | error = -EINVAL; | |
1465 | sprintf(buf, "cp%d", sbi->options.codepage); | |
1466 | sbi->nls_disk = load_nls(buf); | |
1467 | if (!sbi->nls_disk) { | |
869f58c0 | 1468 | fat_msg(sb, KERN_ERR, "codepage %s not found", buf); |
1da177e4 LT |
1469 | goto out_fail; |
1470 | } | |
1471 | ||
1472 | /* FIXME: utf8 is using iocharset for upper/lower conversion */ | |
1473 | if (sbi->options.isvfat) { | |
1474 | sbi->nls_io = load_nls(sbi->options.iocharset); | |
1475 | if (!sbi->nls_io) { | |
869f58c0 | 1476 | fat_msg(sb, KERN_ERR, "IO charset %s not found", |
1da177e4 LT |
1477 | sbi->options.iocharset); |
1478 | goto out_fail; | |
1479 | } | |
1480 | } | |
1481 | ||
1482 | error = -ENOMEM; | |
b522412a AV |
1483 | fat_inode = new_inode(sb); |
1484 | if (!fat_inode) | |
1485 | goto out_fail; | |
1486 | MSDOS_I(fat_inode)->i_pos = 0; | |
1487 | sbi->fat_inode = fat_inode; | |
020ac5b6 AB |
1488 | |
1489 | fsinfo_inode = new_inode(sb); | |
1490 | if (!fsinfo_inode) | |
1491 | goto out_fail; | |
1492 | fsinfo_inode->i_ino = MSDOS_FSINFO_INO; | |
1493 | sbi->fsinfo_inode = fsinfo_inode; | |
1494 | insert_inode_hash(fsinfo_inode); | |
1495 | ||
1da177e4 LT |
1496 | root_inode = new_inode(sb); |
1497 | if (!root_inode) | |
1498 | goto out_fail; | |
1499 | root_inode->i_ino = MSDOS_ROOT_INO; | |
1500 | root_inode->i_version = 1; | |
1501 | error = fat_read_root(root_inode); | |
1688f860 AV |
1502 | if (error < 0) { |
1503 | iput(root_inode); | |
1da177e4 | 1504 | goto out_fail; |
1688f860 | 1505 | } |
1da177e4 LT |
1506 | error = -ENOMEM; |
1507 | insert_inode_hash(root_inode); | |
7669e8fb | 1508 | fat_attach(root_inode, 0); |
1688f860 | 1509 | sb->s_root = d_make_root(root_inode); |
1da177e4 | 1510 | if (!sb->s_root) { |
869f58c0 | 1511 | fat_msg(sb, KERN_ERR, "get root inode failed"); |
1da177e4 LT |
1512 | goto out_fail; |
1513 | } | |
1514 | ||
f562146a NJ |
1515 | if (sbi->options.discard) { |
1516 | struct request_queue *q = bdev_get_queue(sb->s_bdev); | |
1517 | if (!blk_queue_discard(q)) | |
1518 | fat_msg(sb, KERN_WARNING, | |
1519 | "mounting with \"discard\" option, but " | |
1520 | "the device does not support discard"); | |
1521 | } | |
1522 | ||
b88a1058 | 1523 | fat_set_state(sb, 1, 0); |
1da177e4 LT |
1524 | return 0; |
1525 | ||
1526 | out_invalid: | |
1527 | error = -EINVAL; | |
1528 | if (!silent) | |
869f58c0 | 1529 | fat_msg(sb, KERN_INFO, "Can't find a valid FAT filesystem"); |
1da177e4 LT |
1530 | |
1531 | out_fail: | |
020ac5b6 AB |
1532 | if (fsinfo_inode) |
1533 | iput(fsinfo_inode); | |
b522412a AV |
1534 | if (fat_inode) |
1535 | iput(fat_inode); | |
1bdb6f91 OH |
1536 | unload_nls(sbi->nls_io); |
1537 | unload_nls(sbi->nls_disk); | |
1da177e4 LT |
1538 | if (sbi->options.iocharset != fat_default_iocharset) |
1539 | kfree(sbi->options.iocharset); | |
1540 | sb->s_fs_info = NULL; | |
1541 | kfree(sbi); | |
1542 | return error; | |
1543 | } | |
1544 | ||
7c709d00 | 1545 | EXPORT_SYMBOL_GPL(fat_fill_super); |
1da177e4 | 1546 | |
ae78bf9c CM |
1547 | /* |
1548 | * helper function for fat_flush_inodes. This writes both the inode | |
1549 | * and the file data blocks, waiting for in flight data blocks before | |
1550 | * the start of the call. It does not wait for any io started | |
1551 | * during the call | |
1552 | */ | |
1553 | static int writeback_inode(struct inode *inode) | |
1554 | { | |
1555 | ||
1556 | int ret; | |
14864655 NJ |
1557 | |
1558 | /* if we used wait=1, sync_inode_metadata waits for the io for the | |
1559 | * inode to finish. So wait=0 is sent down to sync_inode_metadata | |
ae78bf9c CM |
1560 | * and filemap_fdatawrite is used for the data blocks |
1561 | */ | |
14864655 | 1562 | ret = sync_inode_metadata(inode, 0); |
ae78bf9c | 1563 | if (!ret) |
14864655 | 1564 | ret = filemap_fdatawrite(inode->i_mapping); |
ae78bf9c CM |
1565 | return ret; |
1566 | } | |
1567 | ||
1568 | /* | |
1569 | * write data and metadata corresponding to i1 and i2. The io is | |
1570 | * started but we do not wait for any of it to finish. | |
1571 | * | |
1572 | * filemap_flush is used for the block device, so if there is a dirty | |
1573 | * page for a block already in flight, we will not wait and start the | |
1574 | * io over again | |
1575 | */ | |
1576 | int fat_flush_inodes(struct super_block *sb, struct inode *i1, struct inode *i2) | |
1577 | { | |
1578 | int ret = 0; | |
1579 | if (!MSDOS_SB(sb)->options.flush) | |
1580 | return 0; | |
1581 | if (i1) | |
1582 | ret = writeback_inode(i1); | |
1583 | if (!ret && i2) | |
1584 | ret = writeback_inode(i2); | |
97e860d3 | 1585 | if (!ret) { |
ae78bf9c CM |
1586 | struct address_space *mapping = sb->s_bdev->bd_inode->i_mapping; |
1587 | ret = filemap_flush(mapping); | |
1588 | } | |
1589 | return ret; | |
1590 | } | |
1591 | EXPORT_SYMBOL_GPL(fat_flush_inodes); | |
1592 | ||
1da177e4 LT |
1593 | static int __init init_fat_fs(void) |
1594 | { | |
532a39a3 | 1595 | int err; |
1da177e4 | 1596 | |
532a39a3 PE |
1597 | err = fat_cache_init(); |
1598 | if (err) | |
1599 | return err; | |
1600 | ||
1601 | err = fat_init_inodecache(); | |
1602 | if (err) | |
1603 | goto failed; | |
1604 | ||
1605 | return 0; | |
1606 | ||
1607 | failed: | |
1608 | fat_cache_destroy(); | |
1609 | return err; | |
1da177e4 LT |
1610 | } |
1611 | ||
1612 | static void __exit exit_fat_fs(void) | |
1613 | { | |
1614 | fat_cache_destroy(); | |
1615 | fat_destroy_inodecache(); | |
1616 | } | |
1617 | ||
1618 | module_init(init_fat_fs) | |
1619 | module_exit(exit_fat_fs) | |
1620 | ||
1621 | MODULE_LICENSE("GPL"); |