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> |
1da177e4 | 29 | #include <asm/unaligned.h> |
9e975dae | 30 | #include "fat.h" |
1da177e4 LT |
31 | |
32 | #ifndef CONFIG_FAT_DEFAULT_IOCHARSET | |
33 | /* if user don't select VFAT, this is undefined. */ | |
34 | #define CONFIG_FAT_DEFAULT_IOCHARSET "" | |
35 | #endif | |
36 | ||
37 | static int fat_default_codepage = CONFIG_FAT_DEFAULT_CODEPAGE; | |
38 | static char fat_default_iocharset[] = CONFIG_FAT_DEFAULT_IOCHARSET; | |
39 | ||
40 | ||
41 | static int fat_add_cluster(struct inode *inode) | |
42 | { | |
43 | int err, cluster; | |
44 | ||
45 | err = fat_alloc_clusters(inode, &cluster, 1); | |
46 | if (err) | |
47 | return err; | |
48 | /* FIXME: this cluster should be added after data of this | |
49 | * cluster is writed */ | |
50 | err = fat_chain_add(inode, cluster, 1); | |
51 | if (err) | |
52 | fat_free_clusters(inode, cluster); | |
53 | return err; | |
54 | } | |
55 | ||
6a1d9805 OH |
56 | static inline int __fat_get_block(struct inode *inode, sector_t iblock, |
57 | unsigned long *max_blocks, | |
58 | struct buffer_head *bh_result, int create) | |
1da177e4 LT |
59 | { |
60 | struct super_block *sb = inode->i_sb; | |
e5174baa | 61 | struct msdos_sb_info *sbi = MSDOS_SB(sb); |
e5174baa | 62 | unsigned long mapped_blocks; |
6a1d9805 | 63 | sector_t phys; |
e5174baa | 64 | int err, offset; |
1da177e4 | 65 | |
2bdf67eb | 66 | err = fat_bmap(inode, iblock, &phys, &mapped_blocks, create); |
1da177e4 LT |
67 | if (err) |
68 | return err; | |
69 | if (phys) { | |
70 | map_bh(bh_result, sb, phys); | |
e5174baa | 71 | *max_blocks = min(mapped_blocks, *max_blocks); |
1da177e4 LT |
72 | return 0; |
73 | } | |
74 | if (!create) | |
75 | return 0; | |
e5174baa | 76 | |
1da177e4 | 77 | if (iblock != MSDOS_I(inode)->mmu_private >> sb->s_blocksize_bits) { |
85c78591 | 78 | fat_fs_error(sb, "corrupted file size (i_pos %lld, %lld)", |
6a1d9805 | 79 | MSDOS_I(inode)->i_pos, MSDOS_I(inode)->mmu_private); |
1da177e4 LT |
80 | return -EIO; |
81 | } | |
e5174baa OH |
82 | |
83 | offset = (unsigned long)iblock & (sbi->sec_per_clus - 1); | |
84 | if (!offset) { | |
85 | /* TODO: multiple cluster allocation would be desirable. */ | |
1da177e4 LT |
86 | err = fat_add_cluster(inode); |
87 | if (err) | |
88 | return err; | |
89 | } | |
e5174baa OH |
90 | /* available blocks on this cluster */ |
91 | mapped_blocks = sbi->sec_per_clus - offset; | |
92 | ||
93 | *max_blocks = min(mapped_blocks, *max_blocks); | |
94 | MSDOS_I(inode)->mmu_private += *max_blocks << sb->s_blocksize_bits; | |
95 | ||
2bdf67eb | 96 | err = fat_bmap(inode, iblock, &phys, &mapped_blocks, create); |
1da177e4 LT |
97 | if (err) |
98 | return err; | |
6a1d9805 | 99 | |
e5174baa OH |
100 | BUG_ON(!phys); |
101 | BUG_ON(*max_blocks != mapped_blocks); | |
1da177e4 LT |
102 | set_buffer_new(bh_result); |
103 | map_bh(bh_result, sb, phys); | |
6a1d9805 | 104 | |
1da177e4 LT |
105 | return 0; |
106 | } | |
107 | ||
6a1d9805 OH |
108 | static int fat_get_block(struct inode *inode, sector_t iblock, |
109 | struct buffer_head *bh_result, int create) | |
e5174baa OH |
110 | { |
111 | struct super_block *sb = inode->i_sb; | |
1d8fa7a2 | 112 | unsigned long max_blocks = bh_result->b_size >> inode->i_blkbits; |
6a1d9805 | 113 | int err; |
e5174baa | 114 | |
6a1d9805 | 115 | err = __fat_get_block(inode, iblock, &max_blocks, bh_result, create); |
e5174baa OH |
116 | if (err) |
117 | return err; | |
118 | bh_result->b_size = max_blocks << sb->s_blocksize_bits; | |
119 | return 0; | |
120 | } | |
121 | ||
1da177e4 LT |
122 | static int fat_writepage(struct page *page, struct writeback_control *wbc) |
123 | { | |
124 | return block_write_full_page(page, fat_get_block, wbc); | |
125 | } | |
126 | ||
a5425d29 OH |
127 | static int fat_writepages(struct address_space *mapping, |
128 | struct writeback_control *wbc) | |
129 | { | |
130 | return mpage_writepages(mapping, wbc, fat_get_block); | |
131 | } | |
132 | ||
1da177e4 LT |
133 | static int fat_readpage(struct file *file, struct page *page) |
134 | { | |
a5425d29 OH |
135 | return mpage_readpage(page, fat_get_block); |
136 | } | |
137 | ||
138 | static int fat_readpages(struct file *file, struct address_space *mapping, | |
139 | struct list_head *pages, unsigned nr_pages) | |
140 | { | |
141 | return mpage_readpages(mapping, pages, nr_pages, fat_get_block); | |
1da177e4 LT |
142 | } |
143 | ||
459f6ed3 | 144 | static void fat_write_failed(struct address_space *mapping, loff_t to) |
145 | { | |
146 | struct inode *inode = mapping->host; | |
147 | ||
148 | if (to > inode->i_size) { | |
149 | truncate_pagecache(inode, to, inode->i_size); | |
150 | fat_truncate_blocks(inode, inode->i_size); | |
151 | } | |
152 | } | |
153 | ||
d7777a25 NP |
154 | static int fat_write_begin(struct file *file, struct address_space *mapping, |
155 | loff_t pos, unsigned len, unsigned flags, | |
156 | struct page **pagep, void **fsdata) | |
1da177e4 | 157 | { |
459f6ed3 | 158 | int err; |
159 | ||
d7777a25 | 160 | *pagep = NULL; |
282dc178 | 161 | err = cont_write_begin(file, mapping, pos, len, flags, |
459f6ed3 | 162 | pagep, fsdata, fat_get_block, |
d7777a25 | 163 | &MSDOS_I(mapping->host)->mmu_private); |
459f6ed3 | 164 | if (err < 0) |
165 | fat_write_failed(mapping, pos + len); | |
166 | return err; | |
1da177e4 LT |
167 | } |
168 | ||
d7777a25 NP |
169 | static int fat_write_end(struct file *file, struct address_space *mapping, |
170 | loff_t pos, unsigned len, unsigned copied, | |
171 | struct page *pagep, void *fsdata) | |
ef402268 | 172 | { |
d7777a25 NP |
173 | struct inode *inode = mapping->host; |
174 | int err; | |
175 | err = generic_write_end(file, mapping, pos, len, copied, pagep, fsdata); | |
459f6ed3 | 176 | if (err < len) |
177 | fat_write_failed(mapping, pos + len); | |
d7777a25 | 178 | if (!(err < 0) && !(MSDOS_I(inode)->i_attrs & ATTR_ARCH)) { |
ef402268 OH |
179 | inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC; |
180 | MSDOS_I(inode)->i_attrs |= ATTR_ARCH; | |
181 | mark_inode_dirty(inode); | |
182 | } | |
183 | return err; | |
184 | } | |
185 | ||
e5174baa OH |
186 | static ssize_t fat_direct_IO(int rw, struct kiocb *iocb, |
187 | const struct iovec *iov, | |
188 | loff_t offset, unsigned long nr_segs) | |
189 | { | |
190 | struct file *file = iocb->ki_filp; | |
459f6ed3 | 191 | struct address_space *mapping = file->f_mapping; |
192 | struct inode *inode = mapping->host; | |
193 | ssize_t ret; | |
e5174baa OH |
194 | |
195 | if (rw == WRITE) { | |
196 | /* | |
4e02ed4b | 197 | * FIXME: blockdev_direct_IO() doesn't use ->write_begin(), |
e5174baa OH |
198 | * so we need to update the ->mmu_private to block boundary. |
199 | * | |
200 | * But we must fill the remaining area or hole by nul for | |
201 | * updating ->mmu_private. | |
94412a96 OH |
202 | * |
203 | * Return 0, and fallback to normal buffered write. | |
e5174baa OH |
204 | */ |
205 | loff_t size = offset + iov_length(iov, nr_segs); | |
206 | if (MSDOS_I(inode)->mmu_private < size) | |
94412a96 | 207 | return 0; |
e5174baa OH |
208 | } |
209 | ||
210 | /* | |
211 | * FAT need to use the DIO_LOCKING for avoiding the race | |
212 | * condition of fat_get_block() and ->truncate(). | |
213 | */ | |
aacfc19c CH |
214 | ret = blockdev_direct_IO(rw, iocb, inode, iov, offset, nr_segs, |
215 | fat_get_block); | |
459f6ed3 | 216 | if (ret < 0 && (rw & WRITE)) |
217 | fat_write_failed(mapping, offset + iov_length(iov, nr_segs)); | |
218 | ||
219 | return ret; | |
e5174baa OH |
220 | } |
221 | ||
1da177e4 LT |
222 | static sector_t _fat_bmap(struct address_space *mapping, sector_t block) |
223 | { | |
fa93ca18 OH |
224 | sector_t blocknr; |
225 | ||
226 | /* fat_get_cluster() assumes the requested blocknr isn't truncated. */ | |
58268691 | 227 | down_read(&MSDOS_I(mapping->host)->truncate_lock); |
fa93ca18 | 228 | blocknr = generic_block_bmap(mapping, block, fat_get_block); |
58268691 | 229 | up_read(&MSDOS_I(mapping->host)->truncate_lock); |
fa93ca18 OH |
230 | |
231 | return blocknr; | |
1da177e4 LT |
232 | } |
233 | ||
f5e54d6e | 234 | static const struct address_space_operations fat_aops = { |
1da177e4 | 235 | .readpage = fat_readpage, |
a5425d29 | 236 | .readpages = fat_readpages, |
1da177e4 | 237 | .writepage = fat_writepage, |
a5425d29 | 238 | .writepages = fat_writepages, |
d7777a25 NP |
239 | .write_begin = fat_write_begin, |
240 | .write_end = fat_write_end, | |
e5174baa | 241 | .direct_IO = fat_direct_IO, |
1da177e4 LT |
242 | .bmap = _fat_bmap |
243 | }; | |
244 | ||
245 | /* | |
246 | * New FAT inode stuff. We do the following: | |
247 | * a) i_ino is constant and has nothing with on-disk location. | |
248 | * b) FAT manages its own cache of directory entries. | |
249 | * c) *This* cache is indexed by on-disk location. | |
250 | * d) inode has an associated directory entry, all right, but | |
251 | * it may be unhashed. | |
252 | * e) currently entries are stored within struct inode. That should | |
253 | * change. | |
254 | * f) we deal with races in the following way: | |
255 | * 1. readdir() and lookup() do FAT-dir-cache lookup. | |
256 | * 2. rename() unhashes the F-d-c entry and rehashes it in | |
257 | * a new place. | |
258 | * 3. unlink() and rmdir() unhash F-d-c entry. | |
259 | * 4. fat_write_inode() checks whether the thing is unhashed. | |
260 | * If it is we silently return. If it isn't we do bread(), | |
261 | * check if the location is still valid and retry if it | |
262 | * isn't. Otherwise we do changes. | |
263 | * 5. Spinlock is used to protect hash/unhash/location check/lookup | |
deee3ce4 | 264 | * 6. fat_evict_inode() unhashes the F-d-c entry. |
1da177e4 LT |
265 | * 7. lookup() and readdir() do igrab() if they find a F-d-c entry |
266 | * and consider negative result as cache miss. | |
267 | */ | |
268 | ||
269 | static void fat_hash_init(struct super_block *sb) | |
270 | { | |
271 | struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
272 | int i; | |
273 | ||
274 | spin_lock_init(&sbi->inode_hash_lock); | |
275 | for (i = 0; i < FAT_HASH_SIZE; i++) | |
276 | INIT_HLIST_HEAD(&sbi->inode_hashtable[i]); | |
277 | } | |
278 | ||
d3dfa822 | 279 | static inline unsigned long fat_hash(loff_t i_pos) |
1da177e4 | 280 | { |
d3dfa822 | 281 | return hash_32(i_pos, FAT_HASH_BITS); |
1da177e4 LT |
282 | } |
283 | ||
7669e8fb SM |
284 | static void dir_hash_init(struct super_block *sb) |
285 | { | |
286 | struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
287 | int i; | |
288 | ||
289 | spin_lock_init(&sbi->dir_hash_lock); | |
290 | for (i = 0; i < FAT_HASH_SIZE; i++) | |
291 | INIT_HLIST_HEAD(&sbi->dir_hashtable[i]); | |
292 | } | |
293 | ||
1da177e4 LT |
294 | void fat_attach(struct inode *inode, loff_t i_pos) |
295 | { | |
d3dfa822 | 296 | struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb); |
1da177e4 | 297 | |
7669e8fb SM |
298 | if (inode->i_ino != MSDOS_ROOT_INO) { |
299 | struct hlist_head *head = sbi->inode_hashtable | |
300 | + fat_hash(i_pos); | |
301 | ||
302 | spin_lock(&sbi->inode_hash_lock); | |
303 | MSDOS_I(inode)->i_pos = i_pos; | |
304 | hlist_add_head(&MSDOS_I(inode)->i_fat_hash, head); | |
305 | spin_unlock(&sbi->inode_hash_lock); | |
306 | } | |
307 | ||
308 | /* If NFS support is enabled, cache the mapping of start cluster | |
309 | * to directory inode. This is used during reconnection of | |
310 | * dentries to the filesystem root. | |
311 | */ | |
312 | if (S_ISDIR(inode->i_mode) && sbi->options.nfs) { | |
313 | struct hlist_head *d_head = sbi->dir_hashtable; | |
314 | d_head += fat_dir_hash(MSDOS_I(inode)->i_logstart); | |
315 | ||
316 | spin_lock(&sbi->dir_hash_lock); | |
317 | hlist_add_head(&MSDOS_I(inode)->i_dir_hash, d_head); | |
318 | spin_unlock(&sbi->dir_hash_lock); | |
319 | } | |
1da177e4 | 320 | } |
7c709d00 | 321 | EXPORT_SYMBOL_GPL(fat_attach); |
1da177e4 LT |
322 | |
323 | void fat_detach(struct inode *inode) | |
324 | { | |
325 | struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb); | |
326 | spin_lock(&sbi->inode_hash_lock); | |
327 | MSDOS_I(inode)->i_pos = 0; | |
328 | hlist_del_init(&MSDOS_I(inode)->i_fat_hash); | |
329 | spin_unlock(&sbi->inode_hash_lock); | |
7669e8fb SM |
330 | |
331 | if (S_ISDIR(inode->i_mode) && sbi->options.nfs) { | |
332 | spin_lock(&sbi->dir_hash_lock); | |
333 | hlist_del_init(&MSDOS_I(inode)->i_dir_hash); | |
334 | spin_unlock(&sbi->dir_hash_lock); | |
335 | } | |
1da177e4 | 336 | } |
7c709d00 | 337 | EXPORT_SYMBOL_GPL(fat_detach); |
1da177e4 LT |
338 | |
339 | struct inode *fat_iget(struct super_block *sb, loff_t i_pos) | |
340 | { | |
341 | struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
d3dfa822 | 342 | struct hlist_head *head = sbi->inode_hashtable + fat_hash(i_pos); |
1da177e4 LT |
343 | struct hlist_node *_p; |
344 | struct msdos_inode_info *i; | |
345 | struct inode *inode = NULL; | |
346 | ||
347 | spin_lock(&sbi->inode_hash_lock); | |
348 | hlist_for_each_entry(i, _p, head, i_fat_hash) { | |
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 | ||
a6bf6b21 OH |
490 | static void fat_put_super(struct super_block *sb) |
491 | { | |
492 | struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
1da177e4 | 493 | |
020ac5b6 | 494 | iput(sbi->fsinfo_inode); |
b522412a AV |
495 | iput(sbi->fat_inode); |
496 | ||
6d729e44 TG |
497 | unload_nls(sbi->nls_disk); |
498 | unload_nls(sbi->nls_io); | |
499 | ||
500 | if (sbi->options.iocharset != fat_default_iocharset) | |
1da177e4 | 501 | kfree(sbi->options.iocharset); |
1da177e4 LT |
502 | |
503 | sb->s_fs_info = NULL; | |
504 | kfree(sbi); | |
505 | } | |
506 | ||
e18b890b | 507 | static struct kmem_cache *fat_inode_cachep; |
1da177e4 LT |
508 | |
509 | static struct inode *fat_alloc_inode(struct super_block *sb) | |
510 | { | |
511 | struct msdos_inode_info *ei; | |
8f593427 | 512 | ei = kmem_cache_alloc(fat_inode_cachep, GFP_NOFS); |
1da177e4 LT |
513 | if (!ei) |
514 | return NULL; | |
58268691 CH |
515 | |
516 | init_rwsem(&ei->truncate_lock); | |
1da177e4 LT |
517 | return &ei->vfs_inode; |
518 | } | |
519 | ||
fa0d7e3d | 520 | static void fat_i_callback(struct rcu_head *head) |
1da177e4 | 521 | { |
fa0d7e3d | 522 | struct inode *inode = container_of(head, struct inode, i_rcu); |
1da177e4 LT |
523 | kmem_cache_free(fat_inode_cachep, MSDOS_I(inode)); |
524 | } | |
525 | ||
fa0d7e3d NP |
526 | static void fat_destroy_inode(struct inode *inode) |
527 | { | |
528 | call_rcu(&inode->i_rcu, fat_i_callback); | |
529 | } | |
530 | ||
51cc5068 | 531 | static void init_once(void *foo) |
1da177e4 LT |
532 | { |
533 | struct msdos_inode_info *ei = (struct msdos_inode_info *)foo; | |
534 | ||
a35afb83 CL |
535 | spin_lock_init(&ei->cache_lru_lock); |
536 | ei->nr_caches = 0; | |
537 | ei->cache_valid_id = FAT_CACHE_VALID + 1; | |
538 | INIT_LIST_HEAD(&ei->cache_lru); | |
539 | INIT_HLIST_NODE(&ei->i_fat_hash); | |
7669e8fb | 540 | INIT_HLIST_NODE(&ei->i_dir_hash); |
a35afb83 | 541 | inode_init_once(&ei->vfs_inode); |
1da177e4 LT |
542 | } |
543 | ||
544 | static int __init fat_init_inodecache(void) | |
545 | { | |
546 | fat_inode_cachep = kmem_cache_create("fat_inode_cache", | |
547 | sizeof(struct msdos_inode_info), | |
fffb60f9 PJ |
548 | 0, (SLAB_RECLAIM_ACCOUNT| |
549 | SLAB_MEM_SPREAD), | |
20c2df83 | 550 | init_once); |
1da177e4 LT |
551 | if (fat_inode_cachep == NULL) |
552 | return -ENOMEM; | |
553 | return 0; | |
554 | } | |
555 | ||
556 | static void __exit fat_destroy_inodecache(void) | |
557 | { | |
8c0a8537 KS |
558 | /* |
559 | * Make sure all delayed rcu free inodes are flushed before we | |
560 | * destroy cache. | |
561 | */ | |
562 | rcu_barrier(); | |
1a1d92c1 | 563 | kmem_cache_destroy(fat_inode_cachep); |
1da177e4 LT |
564 | } |
565 | ||
566 | static int fat_remount(struct super_block *sb, int *flags, char *data) | |
567 | { | |
568 | struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
569 | *flags |= MS_NODIRATIME | (sbi->options.isvfat ? 0 : MS_NOATIME); | |
570 | return 0; | |
571 | } | |
572 | ||
726c3342 | 573 | static int fat_statfs(struct dentry *dentry, struct kstatfs *buf) |
1da177e4 | 574 | { |
aac49b75 CL |
575 | struct super_block *sb = dentry->d_sb; |
576 | struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
577 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); | |
1da177e4 LT |
578 | |
579 | /* If the count of free cluster is still unknown, counts it here. */ | |
606e423e | 580 | if (sbi->free_clusters == -1 || !sbi->free_clus_valid) { |
726c3342 | 581 | int err = fat_count_free_clusters(dentry->d_sb); |
1da177e4 LT |
582 | if (err) |
583 | return err; | |
584 | } | |
585 | ||
726c3342 | 586 | buf->f_type = dentry->d_sb->s_magic; |
1da177e4 LT |
587 | buf->f_bsize = sbi->cluster_size; |
588 | buf->f_blocks = sbi->max_cluster - FAT_START_ENT; | |
589 | buf->f_bfree = sbi->free_clusters; | |
590 | buf->f_bavail = sbi->free_clusters; | |
aac49b75 CL |
591 | buf->f_fsid.val[0] = (u32)id; |
592 | buf->f_fsid.val[1] = (u32)(id >> 32); | |
f68e542f OH |
593 | buf->f_namelen = |
594 | (sbi->options.isvfat ? FAT_LFN_LEN : 12) * NLS_MAX_CHARSET_SIZE; | |
1da177e4 LT |
595 | |
596 | return 0; | |
597 | } | |
598 | ||
7669e8fb SM |
599 | static inline loff_t fat_i_pos_read(struct msdos_sb_info *sbi, |
600 | struct inode *inode) | |
601 | { | |
602 | loff_t i_pos; | |
603 | #if BITS_PER_LONG == 32 | |
604 | spin_lock(&sbi->inode_hash_lock); | |
605 | #endif | |
606 | i_pos = MSDOS_I(inode)->i_pos; | |
607 | #if BITS_PER_LONG == 32 | |
608 | spin_unlock(&sbi->inode_hash_lock); | |
609 | #endif | |
610 | return i_pos; | |
611 | } | |
612 | ||
a9185b41 | 613 | static int __fat_write_inode(struct inode *inode, int wait) |
1da177e4 LT |
614 | { |
615 | struct super_block *sb = inode->i_sb; | |
616 | struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
617 | struct buffer_head *bh; | |
618 | struct msdos_dir_entry *raw_entry; | |
619 | loff_t i_pos; | |
5f22ca9b | 620 | int err; |
1da177e4 | 621 | |
9ca59f4c OH |
622 | if (inode->i_ino == MSDOS_ROOT_INO) |
623 | return 0; | |
624 | ||
1da177e4 | 625 | retry: |
9ca59f4c OH |
626 | i_pos = fat_i_pos_read(sbi, inode); |
627 | if (!i_pos) | |
1da177e4 LT |
628 | return 0; |
629 | ||
1da177e4 LT |
630 | bh = sb_bread(sb, i_pos >> sbi->dir_per_block_bits); |
631 | if (!bh) { | |
869f58c0 AF |
632 | fat_msg(sb, KERN_ERR, "unable to read inode block " |
633 | "for updating (i_pos %lld)", i_pos); | |
5f22ca9b | 634 | return -EIO; |
1da177e4 LT |
635 | } |
636 | spin_lock(&sbi->inode_hash_lock); | |
637 | if (i_pos != MSDOS_I(inode)->i_pos) { | |
638 | spin_unlock(&sbi->inode_hash_lock); | |
639 | brelse(bh); | |
1da177e4 LT |
640 | goto retry; |
641 | } | |
642 | ||
643 | raw_entry = &((struct msdos_dir_entry *) (bh->b_data)) | |
644 | [i_pos & (sbi->dir_per_block - 1)]; | |
645 | if (S_ISDIR(inode->i_mode)) | |
646 | raw_entry->size = 0; | |
647 | else | |
648 | raw_entry->size = cpu_to_le32(inode->i_size); | |
9c0aa1b8 | 649 | raw_entry->attr = fat_make_attrs(inode); |
a943ed71 | 650 | fat_set_start(raw_entry, MSDOS_I(inode)->i_logstart); |
7decd1cb OH |
651 | fat_time_unix2fat(sbi, &inode->i_mtime, &raw_entry->time, |
652 | &raw_entry->date, NULL); | |
1da177e4 | 653 | if (sbi->options.isvfat) { |
62a36c43 | 654 | __le16 atime; |
7decd1cb OH |
655 | fat_time_unix2fat(sbi, &inode->i_ctime, &raw_entry->ctime, |
656 | &raw_entry->cdate, &raw_entry->ctime_cs); | |
657 | fat_time_unix2fat(sbi, &inode->i_atime, &atime, | |
658 | &raw_entry->adate, NULL); | |
1da177e4 LT |
659 | } |
660 | spin_unlock(&sbi->inode_hash_lock); | |
661 | mark_buffer_dirty(bh); | |
5f22ca9b | 662 | err = 0; |
1da177e4 LT |
663 | if (wait) |
664 | err = sync_dirty_buffer(bh); | |
665 | brelse(bh); | |
1da177e4 LT |
666 | return err; |
667 | } | |
668 | ||
a9185b41 CH |
669 | static int fat_write_inode(struct inode *inode, struct writeback_control *wbc) |
670 | { | |
78491189 AB |
671 | int err; |
672 | ||
673 | if (inode->i_ino == MSDOS_FSINFO_INO) { | |
674 | struct super_block *sb = inode->i_sb; | |
675 | ||
e40b34c7 | 676 | mutex_lock(&MSDOS_SB(sb)->s_lock); |
78491189 | 677 | err = fat_clusters_flush(sb); |
e40b34c7 | 678 | mutex_unlock(&MSDOS_SB(sb)->s_lock); |
78491189 AB |
679 | } else |
680 | err = __fat_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL); | |
681 | ||
682 | return err; | |
a9185b41 CH |
683 | } |
684 | ||
1da177e4 LT |
685 | int fat_sync_inode(struct inode *inode) |
686 | { | |
a9185b41 | 687 | return __fat_write_inode(inode, 1); |
1da177e4 LT |
688 | } |
689 | ||
7c709d00 | 690 | EXPORT_SYMBOL_GPL(fat_sync_inode); |
1da177e4 | 691 | |
34c80b1d | 692 | static int fat_show_options(struct seq_file *m, struct dentry *root); |
ee9b6d61 | 693 | static const struct super_operations fat_sops = { |
1da177e4 LT |
694 | .alloc_inode = fat_alloc_inode, |
695 | .destroy_inode = fat_destroy_inode, | |
696 | .write_inode = fat_write_inode, | |
deee3ce4 | 697 | .evict_inode = fat_evict_inode, |
1da177e4 LT |
698 | .put_super = fat_put_super, |
699 | .statfs = fat_statfs, | |
1da177e4 LT |
700 | .remount_fs = fat_remount, |
701 | ||
1da177e4 LT |
702 | .show_options = fat_show_options, |
703 | }; | |
704 | ||
39655164 | 705 | static const struct export_operations fat_export_ops = { |
1305edad | 706 | .fh_to_dentry = fat_fh_to_dentry, |
7669e8fb | 707 | .fh_to_parent = fat_fh_to_parent, |
1da177e4 LT |
708 | .get_parent = fat_get_parent, |
709 | }; | |
710 | ||
34c80b1d | 711 | static int fat_show_options(struct seq_file *m, struct dentry *root) |
1da177e4 | 712 | { |
34c80b1d | 713 | struct msdos_sb_info *sbi = MSDOS_SB(root->d_sb); |
1da177e4 LT |
714 | struct fat_mount_options *opts = &sbi->options; |
715 | int isvfat = opts->isvfat; | |
716 | ||
170782eb EB |
717 | if (!uid_eq(opts->fs_uid, GLOBAL_ROOT_UID)) |
718 | seq_printf(m, ",uid=%u", | |
719 | from_kuid_munged(&init_user_ns, opts->fs_uid)); | |
720 | if (!gid_eq(opts->fs_gid, GLOBAL_ROOT_GID)) | |
721 | seq_printf(m, ",gid=%u", | |
722 | from_kgid_munged(&init_user_ns, opts->fs_gid)); | |
1da177e4 LT |
723 | seq_printf(m, ",fmask=%04o", opts->fs_fmask); |
724 | seq_printf(m, ",dmask=%04o", opts->fs_dmask); | |
1ae43f82 OH |
725 | if (opts->allow_utime) |
726 | seq_printf(m, ",allow_utime=%04o", opts->allow_utime); | |
1da177e4 LT |
727 | if (sbi->nls_disk) |
728 | seq_printf(m, ",codepage=%s", sbi->nls_disk->charset); | |
729 | if (isvfat) { | |
730 | if (sbi->nls_io) | |
731 | seq_printf(m, ",iocharset=%s", sbi->nls_io->charset); | |
732 | ||
733 | switch (opts->shortname) { | |
734 | case VFAT_SFN_DISPLAY_WIN95 | VFAT_SFN_CREATE_WIN95: | |
735 | seq_puts(m, ",shortname=win95"); | |
736 | break; | |
737 | case VFAT_SFN_DISPLAY_WINNT | VFAT_SFN_CREATE_WINNT: | |
738 | seq_puts(m, ",shortname=winnt"); | |
739 | break; | |
740 | case VFAT_SFN_DISPLAY_WINNT | VFAT_SFN_CREATE_WIN95: | |
741 | seq_puts(m, ",shortname=mixed"); | |
742 | break; | |
743 | case VFAT_SFN_DISPLAY_LOWER | VFAT_SFN_CREATE_WIN95: | |
95523475 | 744 | seq_puts(m, ",shortname=lower"); |
1da177e4 LT |
745 | break; |
746 | default: | |
747 | seq_puts(m, ",shortname=unknown"); | |
748 | break; | |
749 | } | |
750 | } | |
751 | if (opts->name_check != 'n') | |
752 | seq_printf(m, ",check=%c", opts->name_check); | |
28ec039c OH |
753 | if (opts->usefree) |
754 | seq_puts(m, ",usefree"); | |
1da177e4 LT |
755 | if (opts->quiet) |
756 | seq_puts(m, ",quiet"); | |
7669e8fb SM |
757 | if (opts->nfs) |
758 | seq_puts(m, ",nfs"); | |
1da177e4 LT |
759 | if (opts->showexec) |
760 | seq_puts(m, ",showexec"); | |
761 | if (opts->sys_immutable) | |
762 | seq_puts(m, ",sys_immutable"); | |
763 | if (!isvfat) { | |
764 | if (opts->dotsOK) | |
765 | seq_puts(m, ",dotsOK=yes"); | |
766 | if (opts->nocase) | |
767 | seq_puts(m, ",nocase"); | |
768 | } else { | |
769 | if (opts->utf8) | |
770 | seq_puts(m, ",utf8"); | |
771 | if (opts->unicode_xlate) | |
772 | seq_puts(m, ",uni_xlate"); | |
773 | if (!opts->numtail) | |
774 | seq_puts(m, ",nonumtail"); | |
dfc209c0 OH |
775 | if (opts->rodir) |
776 | seq_puts(m, ",rodir"); | |
1da177e4 | 777 | } |
dfc209c0 | 778 | if (opts->flush) |
c1fca3b6 | 779 | seq_puts(m, ",flush"); |
b271e067 JP |
780 | if (opts->tz_utc) |
781 | seq_puts(m, ",tz=UTC"); | |
85c78591 DK |
782 | if (opts->errors == FAT_ERRORS_CONT) |
783 | seq_puts(m, ",errors=continue"); | |
784 | else if (opts->errors == FAT_ERRORS_PANIC) | |
785 | seq_puts(m, ",errors=panic"); | |
786 | else | |
787 | seq_puts(m, ",errors=remount-ro"); | |
681142f9 CH |
788 | if (opts->discard) |
789 | seq_puts(m, ",discard"); | |
1da177e4 LT |
790 | |
791 | return 0; | |
792 | } | |
793 | ||
794 | enum { | |
795 | Opt_check_n, Opt_check_r, Opt_check_s, Opt_uid, Opt_gid, | |
1ae43f82 OH |
796 | Opt_umask, Opt_dmask, Opt_fmask, Opt_allow_utime, Opt_codepage, |
797 | Opt_usefree, Opt_nocase, Opt_quiet, Opt_showexec, Opt_debug, | |
798 | Opt_immutable, Opt_dots, Opt_nodots, | |
1da177e4 LT |
799 | Opt_charset, Opt_shortname_lower, Opt_shortname_win95, |
800 | Opt_shortname_winnt, Opt_shortname_mixed, Opt_utf8_no, Opt_utf8_yes, | |
801 | Opt_uni_xl_no, Opt_uni_xl_yes, Opt_nonumtail_no, Opt_nonumtail_yes, | |
d7a83c0f | 802 | Opt_obsolete, Opt_flush, Opt_tz_utc, Opt_rodir, Opt_err_cont, |
7669e8fb | 803 | Opt_err_panic, Opt_err_ro, Opt_discard, Opt_nfs, Opt_err, |
1da177e4 LT |
804 | }; |
805 | ||
a447c093 | 806 | static const match_table_t fat_tokens = { |
1da177e4 LT |
807 | {Opt_check_r, "check=relaxed"}, |
808 | {Opt_check_s, "check=strict"}, | |
809 | {Opt_check_n, "check=normal"}, | |
810 | {Opt_check_r, "check=r"}, | |
811 | {Opt_check_s, "check=s"}, | |
812 | {Opt_check_n, "check=n"}, | |
813 | {Opt_uid, "uid=%u"}, | |
814 | {Opt_gid, "gid=%u"}, | |
815 | {Opt_umask, "umask=%o"}, | |
816 | {Opt_dmask, "dmask=%o"}, | |
817 | {Opt_fmask, "fmask=%o"}, | |
1ae43f82 | 818 | {Opt_allow_utime, "allow_utime=%o"}, |
1da177e4 | 819 | {Opt_codepage, "codepage=%u"}, |
28ec039c | 820 | {Opt_usefree, "usefree"}, |
1da177e4 LT |
821 | {Opt_nocase, "nocase"}, |
822 | {Opt_quiet, "quiet"}, | |
823 | {Opt_showexec, "showexec"}, | |
824 | {Opt_debug, "debug"}, | |
825 | {Opt_immutable, "sys_immutable"}, | |
85c78591 DK |
826 | {Opt_flush, "flush"}, |
827 | {Opt_tz_utc, "tz=UTC"}, | |
828 | {Opt_err_cont, "errors=continue"}, | |
829 | {Opt_err_panic, "errors=panic"}, | |
830 | {Opt_err_ro, "errors=remount-ro"}, | |
681142f9 | 831 | {Opt_discard, "discard"}, |
7669e8fb | 832 | {Opt_nfs, "nfs"}, |
d7a83c0f GU |
833 | {Opt_obsolete, "conv=binary"}, |
834 | {Opt_obsolete, "conv=text"}, | |
835 | {Opt_obsolete, "conv=auto"}, | |
836 | {Opt_obsolete, "conv=b"}, | |
837 | {Opt_obsolete, "conv=t"}, | |
838 | {Opt_obsolete, "conv=a"}, | |
839 | {Opt_obsolete, "fat=%u"}, | |
840 | {Opt_obsolete, "blocksize=%u"}, | |
841 | {Opt_obsolete, "cvf_format=%20s"}, | |
842 | {Opt_obsolete, "cvf_options=%100s"}, | |
843 | {Opt_obsolete, "posix"}, | |
ae78bf9c | 844 | {Opt_err, NULL}, |
1da177e4 | 845 | }; |
a447c093 | 846 | static const match_table_t msdos_tokens = { |
1da177e4 LT |
847 | {Opt_nodots, "nodots"}, |
848 | {Opt_nodots, "dotsOK=no"}, | |
849 | {Opt_dots, "dots"}, | |
850 | {Opt_dots, "dotsOK=yes"}, | |
851 | {Opt_err, NULL} | |
852 | }; | |
a447c093 | 853 | static const match_table_t vfat_tokens = { |
1da177e4 LT |
854 | {Opt_charset, "iocharset=%s"}, |
855 | {Opt_shortname_lower, "shortname=lower"}, | |
856 | {Opt_shortname_win95, "shortname=win95"}, | |
857 | {Opt_shortname_winnt, "shortname=winnt"}, | |
858 | {Opt_shortname_mixed, "shortname=mixed"}, | |
859 | {Opt_utf8_no, "utf8=0"}, /* 0 or no or false */ | |
860 | {Opt_utf8_no, "utf8=no"}, | |
861 | {Opt_utf8_no, "utf8=false"}, | |
862 | {Opt_utf8_yes, "utf8=1"}, /* empty or 1 or yes or true */ | |
863 | {Opt_utf8_yes, "utf8=yes"}, | |
864 | {Opt_utf8_yes, "utf8=true"}, | |
865 | {Opt_utf8_yes, "utf8"}, | |
866 | {Opt_uni_xl_no, "uni_xlate=0"}, /* 0 or no or false */ | |
867 | {Opt_uni_xl_no, "uni_xlate=no"}, | |
868 | {Opt_uni_xl_no, "uni_xlate=false"}, | |
869 | {Opt_uni_xl_yes, "uni_xlate=1"}, /* empty or 1 or yes or true */ | |
870 | {Opt_uni_xl_yes, "uni_xlate=yes"}, | |
871 | {Opt_uni_xl_yes, "uni_xlate=true"}, | |
872 | {Opt_uni_xl_yes, "uni_xlate"}, | |
873 | {Opt_nonumtail_no, "nonumtail=0"}, /* 0 or no or false */ | |
874 | {Opt_nonumtail_no, "nonumtail=no"}, | |
875 | {Opt_nonumtail_no, "nonumtail=false"}, | |
876 | {Opt_nonumtail_yes, "nonumtail=1"}, /* empty or 1 or yes or true */ | |
877 | {Opt_nonumtail_yes, "nonumtail=yes"}, | |
878 | {Opt_nonumtail_yes, "nonumtail=true"}, | |
879 | {Opt_nonumtail_yes, "nonumtail"}, | |
dfc209c0 | 880 | {Opt_rodir, "rodir"}, |
1da177e4 LT |
881 | {Opt_err, NULL} |
882 | }; | |
883 | ||
869f58c0 AF |
884 | static int parse_options(struct super_block *sb, char *options, int is_vfat, |
885 | int silent, int *debug, struct fat_mount_options *opts) | |
1da177e4 LT |
886 | { |
887 | char *p; | |
888 | substring_t args[MAX_OPT_ARGS]; | |
889 | int option; | |
890 | char *iocharset; | |
891 | ||
892 | opts->isvfat = is_vfat; | |
893 | ||
f0ce7ee3 DH |
894 | opts->fs_uid = current_uid(); |
895 | opts->fs_gid = current_gid(); | |
3e107603 | 896 | opts->fs_fmask = opts->fs_dmask = current_umask(); |
1ae43f82 | 897 | opts->allow_utime = -1; |
1da177e4 LT |
898 | opts->codepage = fat_default_codepage; |
899 | opts->iocharset = fat_default_iocharset; | |
dfc209c0 | 900 | if (is_vfat) { |
95523475 | 901 | opts->shortname = VFAT_SFN_DISPLAY_WINNT|VFAT_SFN_CREATE_WIN95; |
dfc209c0 OH |
902 | opts->rodir = 0; |
903 | } else { | |
1da177e4 | 904 | opts->shortname = 0; |
dfc209c0 OH |
905 | opts->rodir = 1; |
906 | } | |
1da177e4 LT |
907 | opts->name_check = 'n'; |
908 | opts->quiet = opts->showexec = opts->sys_immutable = opts->dotsOK = 0; | |
909 | opts->utf8 = opts->unicode_xlate = 0; | |
910 | opts->numtail = 1; | |
28ec039c | 911 | opts->usefree = opts->nocase = 0; |
b271e067 | 912 | opts->tz_utc = 0; |
7669e8fb | 913 | opts->nfs = 0; |
85c78591 | 914 | opts->errors = FAT_ERRORS_RO; |
1da177e4 LT |
915 | *debug = 0; |
916 | ||
917 | if (!options) | |
8d44d974 | 918 | goto out; |
1da177e4 LT |
919 | |
920 | while ((p = strsep(&options, ",")) != NULL) { | |
921 | int token; | |
922 | if (!*p) | |
923 | continue; | |
924 | ||
925 | token = match_token(p, fat_tokens, args); | |
926 | if (token == Opt_err) { | |
927 | if (is_vfat) | |
928 | token = match_token(p, vfat_tokens, args); | |
929 | else | |
930 | token = match_token(p, msdos_tokens, args); | |
931 | } | |
932 | switch (token) { | |
933 | case Opt_check_s: | |
934 | opts->name_check = 's'; | |
935 | break; | |
936 | case Opt_check_r: | |
937 | opts->name_check = 'r'; | |
938 | break; | |
939 | case Opt_check_n: | |
940 | opts->name_check = 'n'; | |
941 | break; | |
28ec039c OH |
942 | case Opt_usefree: |
943 | opts->usefree = 1; | |
944 | break; | |
1da177e4 LT |
945 | case Opt_nocase: |
946 | if (!is_vfat) | |
947 | opts->nocase = 1; | |
948 | else { | |
949 | /* for backward compatibility */ | |
950 | opts->shortname = VFAT_SFN_DISPLAY_WIN95 | |
951 | | VFAT_SFN_CREATE_WIN95; | |
952 | } | |
953 | break; | |
954 | case Opt_quiet: | |
955 | opts->quiet = 1; | |
956 | break; | |
957 | case Opt_showexec: | |
958 | opts->showexec = 1; | |
959 | break; | |
960 | case Opt_debug: | |
961 | *debug = 1; | |
962 | break; | |
963 | case Opt_immutable: | |
964 | opts->sys_immutable = 1; | |
965 | break; | |
966 | case Opt_uid: | |
967 | if (match_int(&args[0], &option)) | |
968 | return 0; | |
170782eb EB |
969 | opts->fs_uid = make_kuid(current_user_ns(), option); |
970 | if (!uid_valid(opts->fs_uid)) | |
971 | return 0; | |
1da177e4 LT |
972 | break; |
973 | case Opt_gid: | |
974 | if (match_int(&args[0], &option)) | |
975 | return 0; | |
170782eb EB |
976 | opts->fs_gid = make_kgid(current_user_ns(), option); |
977 | if (!gid_valid(opts->fs_gid)) | |
978 | return 0; | |
1da177e4 LT |
979 | break; |
980 | case Opt_umask: | |
981 | if (match_octal(&args[0], &option)) | |
982 | return 0; | |
983 | opts->fs_fmask = opts->fs_dmask = option; | |
984 | break; | |
985 | case Opt_dmask: | |
986 | if (match_octal(&args[0], &option)) | |
987 | return 0; | |
988 | opts->fs_dmask = option; | |
989 | break; | |
990 | case Opt_fmask: | |
991 | if (match_octal(&args[0], &option)) | |
992 | return 0; | |
993 | opts->fs_fmask = option; | |
994 | break; | |
1ae43f82 OH |
995 | case Opt_allow_utime: |
996 | if (match_octal(&args[0], &option)) | |
997 | return 0; | |
998 | opts->allow_utime = option & (S_IWGRP | S_IWOTH); | |
999 | break; | |
1da177e4 LT |
1000 | case Opt_codepage: |
1001 | if (match_int(&args[0], &option)) | |
1002 | return 0; | |
1003 | opts->codepage = option; | |
1004 | break; | |
ae78bf9c CM |
1005 | case Opt_flush: |
1006 | opts->flush = 1; | |
1007 | break; | |
b271e067 JP |
1008 | case Opt_tz_utc: |
1009 | opts->tz_utc = 1; | |
1010 | break; | |
85c78591 DK |
1011 | case Opt_err_cont: |
1012 | opts->errors = FAT_ERRORS_CONT; | |
1013 | break; | |
1014 | case Opt_err_panic: | |
1015 | opts->errors = FAT_ERRORS_PANIC; | |
1016 | break; | |
1017 | case Opt_err_ro: | |
1018 | opts->errors = FAT_ERRORS_RO; | |
1019 | break; | |
1da177e4 LT |
1020 | |
1021 | /* msdos specific */ | |
1022 | case Opt_dots: | |
1023 | opts->dotsOK = 1; | |
1024 | break; | |
1025 | case Opt_nodots: | |
1026 | opts->dotsOK = 0; | |
1027 | break; | |
1028 | ||
1029 | /* vfat specific */ | |
1030 | case Opt_charset: | |
1031 | if (opts->iocharset != fat_default_iocharset) | |
1032 | kfree(opts->iocharset); | |
1033 | iocharset = match_strdup(&args[0]); | |
1034 | if (!iocharset) | |
1035 | return -ENOMEM; | |
1036 | opts->iocharset = iocharset; | |
1037 | break; | |
1038 | case Opt_shortname_lower: | |
1039 | opts->shortname = VFAT_SFN_DISPLAY_LOWER | |
1040 | | VFAT_SFN_CREATE_WIN95; | |
1041 | break; | |
1042 | case Opt_shortname_win95: | |
1043 | opts->shortname = VFAT_SFN_DISPLAY_WIN95 | |
1044 | | VFAT_SFN_CREATE_WIN95; | |
1045 | break; | |
1046 | case Opt_shortname_winnt: | |
1047 | opts->shortname = VFAT_SFN_DISPLAY_WINNT | |
1048 | | VFAT_SFN_CREATE_WINNT; | |
1049 | break; | |
1050 | case Opt_shortname_mixed: | |
1051 | opts->shortname = VFAT_SFN_DISPLAY_WINNT | |
1052 | | VFAT_SFN_CREATE_WIN95; | |
1053 | break; | |
1054 | case Opt_utf8_no: /* 0 or no or false */ | |
1055 | opts->utf8 = 0; | |
1056 | break; | |
1057 | case Opt_utf8_yes: /* empty or 1 or yes or true */ | |
1058 | opts->utf8 = 1; | |
1059 | break; | |
1060 | case Opt_uni_xl_no: /* 0 or no or false */ | |
1061 | opts->unicode_xlate = 0; | |
1062 | break; | |
1063 | case Opt_uni_xl_yes: /* empty or 1 or yes or true */ | |
1064 | opts->unicode_xlate = 1; | |
1065 | break; | |
1066 | case Opt_nonumtail_no: /* 0 or no or false */ | |
1067 | opts->numtail = 1; /* negated option */ | |
1068 | break; | |
1069 | case Opt_nonumtail_yes: /* empty or 1 or yes or true */ | |
1070 | opts->numtail = 0; /* negated option */ | |
1071 | break; | |
dfc209c0 OH |
1072 | case Opt_rodir: |
1073 | opts->rodir = 1; | |
1074 | break; | |
681142f9 CH |
1075 | case Opt_discard: |
1076 | opts->discard = 1; | |
1077 | break; | |
7669e8fb SM |
1078 | case Opt_nfs: |
1079 | opts->nfs = 1; | |
1080 | break; | |
1da177e4 LT |
1081 | |
1082 | /* obsolete mount options */ | |
d7a83c0f | 1083 | case Opt_obsolete: |
869f58c0 AF |
1084 | fat_msg(sb, KERN_INFO, "\"%s\" option is obsolete, " |
1085 | "not supported now", p); | |
1da177e4 LT |
1086 | break; |
1087 | /* unknown option */ | |
1088 | default: | |
41a34a4f | 1089 | if (!silent) { |
869f58c0 AF |
1090 | fat_msg(sb, KERN_ERR, |
1091 | "Unrecognized mount option \"%s\" " | |
1092 | "or missing value", p); | |
41a34a4f | 1093 | } |
1da177e4 LT |
1094 | return -EINVAL; |
1095 | } | |
1096 | } | |
8d44d974 OH |
1097 | |
1098 | out: | |
4de151d8 | 1099 | /* UTF-8 doesn't provide FAT semantics */ |
1da177e4 | 1100 | if (!strcmp(opts->iocharset, "utf8")) { |
186b5370 | 1101 | fat_msg(sb, KERN_WARNING, "utf8 is not a recommended IO charset" |
8d44d974 | 1102 | " for FAT filesystems, filesystem will be " |
186b5370 | 1103 | "case sensitive!"); |
1da177e4 LT |
1104 | } |
1105 | ||
1ae43f82 OH |
1106 | /* If user doesn't specify allow_utime, it's initialized from dmask. */ |
1107 | if (opts->allow_utime == (unsigned short)-1) | |
1108 | opts->allow_utime = ~opts->fs_dmask & (S_IWGRP | S_IWOTH); | |
1da177e4 LT |
1109 | if (opts->unicode_xlate) |
1110 | opts->utf8 = 0; | |
1111 | ||
1112 | return 0; | |
1113 | } | |
1114 | ||
1115 | static int fat_read_root(struct inode *inode) | |
1116 | { | |
1117 | struct super_block *sb = inode->i_sb; | |
1118 | struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
1119 | int error; | |
1120 | ||
1121 | MSDOS_I(inode)->i_pos = 0; | |
1122 | inode->i_uid = sbi->options.fs_uid; | |
1123 | inode->i_gid = sbi->options.fs_gid; | |
1124 | inode->i_version++; | |
1125 | inode->i_generation = 0; | |
9c0aa1b8 | 1126 | inode->i_mode = fat_make_mode(sbi, ATTR_DIR, S_IRWXUGO); |
1da177e4 LT |
1127 | inode->i_op = sbi->dir_ops; |
1128 | inode->i_fop = &fat_dir_operations; | |
1129 | if (sbi->fat_bits == 32) { | |
1130 | MSDOS_I(inode)->i_start = sbi->root_cluster; | |
1131 | error = fat_calc_dir_size(inode); | |
1132 | if (error < 0) | |
1133 | return error; | |
1134 | } else { | |
1135 | MSDOS_I(inode)->i_start = 0; | |
1136 | inode->i_size = sbi->dir_entries * sizeof(struct msdos_dir_entry); | |
1137 | } | |
1da177e4 LT |
1138 | inode->i_blocks = ((inode->i_size + (sbi->cluster_size - 1)) |
1139 | & ~((loff_t)sbi->cluster_size - 1)) >> 9; | |
1140 | MSDOS_I(inode)->i_logstart = 0; | |
1141 | MSDOS_I(inode)->mmu_private = inode->i_size; | |
1142 | ||
9c0aa1b8 | 1143 | fat_save_attrs(inode, ATTR_DIR); |
1da177e4 LT |
1144 | inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = 0; |
1145 | inode->i_mtime.tv_nsec = inode->i_atime.tv_nsec = inode->i_ctime.tv_nsec = 0; | |
bfe86848 | 1146 | set_nlink(inode, fat_subdirs(inode)+2); |
1da177e4 LT |
1147 | |
1148 | return 0; | |
1149 | } | |
1150 | ||
1151 | /* | |
1152 | * Read the super block of an MS-DOS FS. | |
1153 | */ | |
384f5c96 | 1154 | int fat_fill_super(struct super_block *sb, void *data, int silent, int isvfat, |
3d23985d | 1155 | void (*setup)(struct super_block *)) |
1da177e4 | 1156 | { |
b522412a | 1157 | struct inode *root_inode = NULL, *fat_inode = NULL; |
020ac5b6 | 1158 | struct inode *fsinfo_inode = NULL; |
1da177e4 LT |
1159 | struct buffer_head *bh; |
1160 | struct fat_boot_sector *b; | |
1161 | struct msdos_sb_info *sbi; | |
1162 | u16 logical_sector_size; | |
1163 | u32 total_sectors, total_clusters, fat_clusters, rootdir_sectors; | |
1164 | int debug; | |
1165 | unsigned int media; | |
1166 | long error; | |
1167 | char buf[50]; | |
1168 | ||
8f593427 LT |
1169 | /* |
1170 | * GFP_KERNEL is ok here, because while we do hold the | |
1171 | * supeblock lock, memory pressure can't call back into | |
1172 | * the filesystem, since we're only just about to mount | |
1173 | * it and have no inodes etc active! | |
1174 | */ | |
f8314dc6 | 1175 | sbi = kzalloc(sizeof(struct msdos_sb_info), GFP_KERNEL); |
1da177e4 LT |
1176 | if (!sbi) |
1177 | return -ENOMEM; | |
1178 | sb->s_fs_info = sbi; | |
1da177e4 LT |
1179 | |
1180 | sb->s_flags |= MS_NODIRATIME; | |
1181 | sb->s_magic = MSDOS_SUPER_MAGIC; | |
1182 | sb->s_op = &fat_sops; | |
1183 | sb->s_export_op = &fat_export_ops; | |
aaa04b48 OH |
1184 | ratelimit_state_init(&sbi->ratelimit, DEFAULT_RATELIMIT_INTERVAL, |
1185 | DEFAULT_RATELIMIT_BURST); | |
1da177e4 | 1186 | |
869f58c0 | 1187 | error = parse_options(sb, data, isvfat, silent, &debug, &sbi->options); |
1da177e4 LT |
1188 | if (error) |
1189 | goto out_fail; | |
1190 | ||
3d23985d AV |
1191 | setup(sb); /* flavour-specific stuff that needs options */ |
1192 | ||
1da177e4 LT |
1193 | error = -EIO; |
1194 | sb_min_blocksize(sb, 512); | |
1195 | bh = sb_bread(sb, 0); | |
1196 | if (bh == NULL) { | |
869f58c0 | 1197 | fat_msg(sb, KERN_ERR, "unable to read boot sector"); |
1da177e4 LT |
1198 | goto out_fail; |
1199 | } | |
1200 | ||
1201 | b = (struct fat_boot_sector *) bh->b_data; | |
1202 | if (!b->reserved) { | |
1203 | if (!silent) | |
869f58c0 | 1204 | fat_msg(sb, KERN_ERR, "bogus number of reserved sectors"); |
1da177e4 LT |
1205 | brelse(bh); |
1206 | goto out_invalid; | |
1207 | } | |
1208 | if (!b->fats) { | |
1209 | if (!silent) | |
869f58c0 | 1210 | fat_msg(sb, KERN_ERR, "bogus number of FAT structure"); |
1da177e4 LT |
1211 | brelse(bh); |
1212 | goto out_invalid; | |
1213 | } | |
1214 | ||
1215 | /* | |
1216 | * Earlier we checked here that b->secs_track and b->head are nonzero, | |
1217 | * but it turns out valid FAT filesystems can have zero there. | |
1218 | */ | |
1219 | ||
1220 | media = b->media; | |
73f20e58 | 1221 | if (!fat_valid_media(media)) { |
1da177e4 | 1222 | if (!silent) |
869f58c0 | 1223 | fat_msg(sb, KERN_ERR, "invalid media value (0x%02x)", |
1da177e4 LT |
1224 | media); |
1225 | brelse(bh); | |
1226 | goto out_invalid; | |
1227 | } | |
803f445f | 1228 | logical_sector_size = get_unaligned_le16(&b->sector_size); |
e7d709c0 | 1229 | if (!is_power_of_2(logical_sector_size) |
1da177e4 | 1230 | || (logical_sector_size < 512) |
9f354858 | 1231 | || (logical_sector_size > 4096)) { |
1da177e4 | 1232 | if (!silent) |
869f58c0 | 1233 | fat_msg(sb, KERN_ERR, "bogus logical sector size %u", |
1da177e4 LT |
1234 | logical_sector_size); |
1235 | brelse(bh); | |
1236 | goto out_invalid; | |
1237 | } | |
1238 | sbi->sec_per_clus = b->sec_per_clus; | |
e7d709c0 | 1239 | if (!is_power_of_2(sbi->sec_per_clus)) { |
1da177e4 | 1240 | if (!silent) |
869f58c0 | 1241 | fat_msg(sb, KERN_ERR, "bogus sectors per cluster %u", |
1da177e4 LT |
1242 | sbi->sec_per_clus); |
1243 | brelse(bh); | |
1244 | goto out_invalid; | |
1245 | } | |
1246 | ||
1247 | if (logical_sector_size < sb->s_blocksize) { | |
869f58c0 AF |
1248 | fat_msg(sb, KERN_ERR, "logical sector size too small for device" |
1249 | " (logical sector size = %u)", logical_sector_size); | |
1da177e4 LT |
1250 | brelse(bh); |
1251 | goto out_fail; | |
1252 | } | |
1253 | if (logical_sector_size > sb->s_blocksize) { | |
1254 | brelse(bh); | |
1255 | ||
1256 | if (!sb_set_blocksize(sb, logical_sector_size)) { | |
869f58c0 | 1257 | fat_msg(sb, KERN_ERR, "unable to set blocksize %u", |
1da177e4 LT |
1258 | logical_sector_size); |
1259 | goto out_fail; | |
1260 | } | |
1261 | bh = sb_bread(sb, 0); | |
1262 | if (bh == NULL) { | |
869f58c0 AF |
1263 | fat_msg(sb, KERN_ERR, "unable to read boot sector" |
1264 | " (logical sector size = %lu)", | |
1da177e4 LT |
1265 | sb->s_blocksize); |
1266 | goto out_fail; | |
1267 | } | |
1268 | b = (struct fat_boot_sector *) bh->b_data; | |
1269 | } | |
1270 | ||
e40b34c7 | 1271 | mutex_init(&sbi->s_lock); |
1da177e4 LT |
1272 | sbi->cluster_size = sb->s_blocksize * sbi->sec_per_clus; |
1273 | sbi->cluster_bits = ffs(sbi->cluster_size) - 1; | |
1274 | sbi->fats = b->fats; | |
1275 | sbi->fat_bits = 0; /* Don't know yet */ | |
1276 | sbi->fat_start = le16_to_cpu(b->reserved); | |
1277 | sbi->fat_length = le16_to_cpu(b->fat_length); | |
1278 | sbi->root_cluster = 0; | |
1279 | sbi->free_clusters = -1; /* Don't know yet */ | |
606e423e | 1280 | sbi->free_clus_valid = 0; |
1da177e4 | 1281 | sbi->prev_free = FAT_START_ENT; |
710d4403 | 1282 | sb->s_maxbytes = 0xffffffff; |
1da177e4 LT |
1283 | |
1284 | if (!sbi->fat_length && b->fat32_length) { | |
1285 | struct fat_boot_fsinfo *fsinfo; | |
1286 | struct buffer_head *fsinfo_bh; | |
1287 | ||
1288 | /* Must be FAT32 */ | |
1289 | sbi->fat_bits = 32; | |
1290 | sbi->fat_length = le32_to_cpu(b->fat32_length); | |
1291 | sbi->root_cluster = le32_to_cpu(b->root_cluster); | |
1292 | ||
1da177e4 LT |
1293 | /* MC - if info_sector is 0, don't multiply by 0 */ |
1294 | sbi->fsinfo_sector = le16_to_cpu(b->info_sector); | |
1295 | if (sbi->fsinfo_sector == 0) | |
1296 | sbi->fsinfo_sector = 1; | |
1297 | ||
1298 | fsinfo_bh = sb_bread(sb, sbi->fsinfo_sector); | |
1299 | if (fsinfo_bh == NULL) { | |
869f58c0 AF |
1300 | fat_msg(sb, KERN_ERR, "bread failed, FSINFO block" |
1301 | " (sector = %lu)", sbi->fsinfo_sector); | |
1da177e4 LT |
1302 | brelse(bh); |
1303 | goto out_fail; | |
1304 | } | |
1305 | ||
1306 | fsinfo = (struct fat_boot_fsinfo *)fsinfo_bh->b_data; | |
1307 | if (!IS_FSINFO(fsinfo)) { | |
869f58c0 AF |
1308 | fat_msg(sb, KERN_WARNING, "Invalid FSINFO signature: " |
1309 | "0x%08x, 0x%08x (sector = %lu)", | |
1da177e4 LT |
1310 | le32_to_cpu(fsinfo->signature1), |
1311 | le32_to_cpu(fsinfo->signature2), | |
1312 | sbi->fsinfo_sector); | |
1313 | } else { | |
28ec039c | 1314 | if (sbi->options.usefree) |
606e423e OH |
1315 | sbi->free_clus_valid = 1; |
1316 | sbi->free_clusters = le32_to_cpu(fsinfo->free_clusters); | |
1da177e4 LT |
1317 | sbi->prev_free = le32_to_cpu(fsinfo->next_cluster); |
1318 | } | |
1319 | ||
1320 | brelse(fsinfo_bh); | |
1321 | } | |
1322 | ||
1323 | sbi->dir_per_block = sb->s_blocksize / sizeof(struct msdos_dir_entry); | |
1324 | sbi->dir_per_block_bits = ffs(sbi->dir_per_block) - 1; | |
1325 | ||
1326 | sbi->dir_start = sbi->fat_start + sbi->fats * sbi->fat_length; | |
803f445f | 1327 | sbi->dir_entries = get_unaligned_le16(&b->dir_entries); |
1da177e4 LT |
1328 | if (sbi->dir_entries & (sbi->dir_per_block - 1)) { |
1329 | if (!silent) | |
869f58c0 AF |
1330 | fat_msg(sb, KERN_ERR, "bogus directroy-entries per block" |
1331 | " (%u)", sbi->dir_entries); | |
1da177e4 LT |
1332 | brelse(bh); |
1333 | goto out_invalid; | |
1334 | } | |
1335 | ||
1336 | rootdir_sectors = sbi->dir_entries | |
1337 | * sizeof(struct msdos_dir_entry) / sb->s_blocksize; | |
1338 | sbi->data_start = sbi->dir_start + rootdir_sectors; | |
803f445f | 1339 | total_sectors = get_unaligned_le16(&b->sectors); |
1da177e4 LT |
1340 | if (total_sectors == 0) |
1341 | total_sectors = le32_to_cpu(b->total_sect); | |
1342 | ||
1343 | total_clusters = (total_sectors - sbi->data_start) / sbi->sec_per_clus; | |
1344 | ||
1345 | if (sbi->fat_bits != 32) | |
1346 | sbi->fat_bits = (total_clusters > MAX_FAT12) ? 16 : 12; | |
1347 | ||
1348 | /* check that FAT table does not overflow */ | |
1349 | fat_clusters = sbi->fat_length * sb->s_blocksize * 8 / sbi->fat_bits; | |
1350 | total_clusters = min(total_clusters, fat_clusters - FAT_START_ENT); | |
1351 | if (total_clusters > MAX_FAT(sb)) { | |
1352 | if (!silent) | |
869f58c0 | 1353 | fat_msg(sb, KERN_ERR, "count of clusters too big (%u)", |
1da177e4 LT |
1354 | total_clusters); |
1355 | brelse(bh); | |
1356 | goto out_invalid; | |
1357 | } | |
1358 | ||
1359 | sbi->max_cluster = total_clusters + FAT_START_ENT; | |
1360 | /* check the free_clusters, it's not necessarily correct */ | |
1361 | if (sbi->free_clusters != -1 && sbi->free_clusters > total_clusters) | |
1362 | sbi->free_clusters = -1; | |
1363 | /* check the prev_free, it's not necessarily correct */ | |
1364 | sbi->prev_free %= sbi->max_cluster; | |
1365 | if (sbi->prev_free < FAT_START_ENT) | |
1366 | sbi->prev_free = FAT_START_ENT; | |
1367 | ||
1368 | brelse(bh); | |
1369 | ||
1370 | /* set up enough so that it can read an inode */ | |
1371 | fat_hash_init(sb); | |
7669e8fb | 1372 | dir_hash_init(sb); |
1da177e4 LT |
1373 | fat_ent_access_init(sb); |
1374 | ||
1375 | /* | |
1376 | * The low byte of FAT's first entry must have same value with | |
1377 | * media-field. But in real world, too many devices is | |
1378 | * writing wrong value. So, removed that validity check. | |
1379 | * | |
1380 | * if (FAT_FIRST_ENT(sb, media) != first) | |
1381 | */ | |
1382 | ||
1383 | error = -EINVAL; | |
1384 | sprintf(buf, "cp%d", sbi->options.codepage); | |
1385 | sbi->nls_disk = load_nls(buf); | |
1386 | if (!sbi->nls_disk) { | |
869f58c0 | 1387 | fat_msg(sb, KERN_ERR, "codepage %s not found", buf); |
1da177e4 LT |
1388 | goto out_fail; |
1389 | } | |
1390 | ||
1391 | /* FIXME: utf8 is using iocharset for upper/lower conversion */ | |
1392 | if (sbi->options.isvfat) { | |
1393 | sbi->nls_io = load_nls(sbi->options.iocharset); | |
1394 | if (!sbi->nls_io) { | |
869f58c0 | 1395 | fat_msg(sb, KERN_ERR, "IO charset %s not found", |
1da177e4 LT |
1396 | sbi->options.iocharset); |
1397 | goto out_fail; | |
1398 | } | |
1399 | } | |
1400 | ||
1401 | error = -ENOMEM; | |
b522412a AV |
1402 | fat_inode = new_inode(sb); |
1403 | if (!fat_inode) | |
1404 | goto out_fail; | |
1405 | MSDOS_I(fat_inode)->i_pos = 0; | |
1406 | sbi->fat_inode = fat_inode; | |
020ac5b6 AB |
1407 | |
1408 | fsinfo_inode = new_inode(sb); | |
1409 | if (!fsinfo_inode) | |
1410 | goto out_fail; | |
1411 | fsinfo_inode->i_ino = MSDOS_FSINFO_INO; | |
1412 | sbi->fsinfo_inode = fsinfo_inode; | |
1413 | insert_inode_hash(fsinfo_inode); | |
1414 | ||
1da177e4 LT |
1415 | root_inode = new_inode(sb); |
1416 | if (!root_inode) | |
1417 | goto out_fail; | |
1418 | root_inode->i_ino = MSDOS_ROOT_INO; | |
1419 | root_inode->i_version = 1; | |
1420 | error = fat_read_root(root_inode); | |
1688f860 AV |
1421 | if (error < 0) { |
1422 | iput(root_inode); | |
1da177e4 | 1423 | goto out_fail; |
1688f860 | 1424 | } |
1da177e4 LT |
1425 | error = -ENOMEM; |
1426 | insert_inode_hash(root_inode); | |
7669e8fb | 1427 | fat_attach(root_inode, 0); |
1688f860 | 1428 | sb->s_root = d_make_root(root_inode); |
1da177e4 | 1429 | if (!sb->s_root) { |
869f58c0 | 1430 | fat_msg(sb, KERN_ERR, "get root inode failed"); |
1da177e4 LT |
1431 | goto out_fail; |
1432 | } | |
1433 | ||
1434 | return 0; | |
1435 | ||
1436 | out_invalid: | |
1437 | error = -EINVAL; | |
1438 | if (!silent) | |
869f58c0 | 1439 | fat_msg(sb, KERN_INFO, "Can't find a valid FAT filesystem"); |
1da177e4 LT |
1440 | |
1441 | out_fail: | |
020ac5b6 AB |
1442 | if (fsinfo_inode) |
1443 | iput(fsinfo_inode); | |
b522412a AV |
1444 | if (fat_inode) |
1445 | iput(fat_inode); | |
1bdb6f91 OH |
1446 | unload_nls(sbi->nls_io); |
1447 | unload_nls(sbi->nls_disk); | |
1da177e4 LT |
1448 | if (sbi->options.iocharset != fat_default_iocharset) |
1449 | kfree(sbi->options.iocharset); | |
1450 | sb->s_fs_info = NULL; | |
1451 | kfree(sbi); | |
1452 | return error; | |
1453 | } | |
1454 | ||
7c709d00 | 1455 | EXPORT_SYMBOL_GPL(fat_fill_super); |
1da177e4 | 1456 | |
ae78bf9c CM |
1457 | /* |
1458 | * helper function for fat_flush_inodes. This writes both the inode | |
1459 | * and the file data blocks, waiting for in flight data blocks before | |
1460 | * the start of the call. It does not wait for any io started | |
1461 | * during the call | |
1462 | */ | |
1463 | static int writeback_inode(struct inode *inode) | |
1464 | { | |
1465 | ||
1466 | int ret; | |
14864655 NJ |
1467 | |
1468 | /* if we used wait=1, sync_inode_metadata waits for the io for the | |
1469 | * inode to finish. So wait=0 is sent down to sync_inode_metadata | |
ae78bf9c CM |
1470 | * and filemap_fdatawrite is used for the data blocks |
1471 | */ | |
14864655 | 1472 | ret = sync_inode_metadata(inode, 0); |
ae78bf9c | 1473 | if (!ret) |
14864655 | 1474 | ret = filemap_fdatawrite(inode->i_mapping); |
ae78bf9c CM |
1475 | return ret; |
1476 | } | |
1477 | ||
1478 | /* | |
1479 | * write data and metadata corresponding to i1 and i2. The io is | |
1480 | * started but we do not wait for any of it to finish. | |
1481 | * | |
1482 | * filemap_flush is used for the block device, so if there is a dirty | |
1483 | * page for a block already in flight, we will not wait and start the | |
1484 | * io over again | |
1485 | */ | |
1486 | int fat_flush_inodes(struct super_block *sb, struct inode *i1, struct inode *i2) | |
1487 | { | |
1488 | int ret = 0; | |
1489 | if (!MSDOS_SB(sb)->options.flush) | |
1490 | return 0; | |
1491 | if (i1) | |
1492 | ret = writeback_inode(i1); | |
1493 | if (!ret && i2) | |
1494 | ret = writeback_inode(i2); | |
97e860d3 | 1495 | if (!ret) { |
ae78bf9c CM |
1496 | struct address_space *mapping = sb->s_bdev->bd_inode->i_mapping; |
1497 | ret = filemap_flush(mapping); | |
1498 | } | |
1499 | return ret; | |
1500 | } | |
1501 | EXPORT_SYMBOL_GPL(fat_flush_inodes); | |
1502 | ||
1da177e4 LT |
1503 | static int __init init_fat_fs(void) |
1504 | { | |
532a39a3 | 1505 | int err; |
1da177e4 | 1506 | |
532a39a3 PE |
1507 | err = fat_cache_init(); |
1508 | if (err) | |
1509 | return err; | |
1510 | ||
1511 | err = fat_init_inodecache(); | |
1512 | if (err) | |
1513 | goto failed; | |
1514 | ||
1515 | return 0; | |
1516 | ||
1517 | failed: | |
1518 | fat_cache_destroy(); | |
1519 | return err; | |
1da177e4 LT |
1520 | } |
1521 | ||
1522 | static void __exit exit_fat_fs(void) | |
1523 | { | |
1524 | fat_cache_destroy(); | |
1525 | fat_destroy_inodecache(); | |
1526 | } | |
1527 | ||
1528 | module_init(init_fat_fs) | |
1529 | module_exit(exit_fat_fs) | |
1530 | ||
1531 | MODULE_LICENSE("GPL"); |