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Commit | Line | Data |
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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> | |
17 | #include <linux/smp_lock.h> | |
18 | #include <linux/seq_file.h> | |
1da177e4 | 19 | #include <linux/pagemap.h> |
a5425d29 | 20 | #include <linux/mpage.h> |
1da177e4 | 21 | #include <linux/buffer_head.h> |
a5694255 | 22 | #include <linux/exportfs.h> |
1da177e4 LT |
23 | #include <linux/mount.h> |
24 | #include <linux/vfs.h> | |
25 | #include <linux/parser.h> | |
e5174baa | 26 | #include <linux/uio.h> |
ae78bf9c | 27 | #include <linux/writeback.h> |
e7d709c0 | 28 | #include <linux/log2.h> |
d3dfa822 | 29 | #include <linux/hash.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 LT |
78 | if (iblock != MSDOS_I(inode)->mmu_private >> sb->s_blocksize_bits) { |
79 | fat_fs_panic(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 | ||
d7777a25 NP |
145 | static int fat_write_begin(struct file *file, struct address_space *mapping, |
146 | loff_t pos, unsigned len, unsigned flags, | |
147 | struct page **pagep, void **fsdata) | |
1da177e4 | 148 | { |
d7777a25 NP |
149 | *pagep = NULL; |
150 | return cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata, | |
151 | fat_get_block, | |
152 | &MSDOS_I(mapping->host)->mmu_private); | |
1da177e4 LT |
153 | } |
154 | ||
d7777a25 NP |
155 | static int fat_write_end(struct file *file, struct address_space *mapping, |
156 | loff_t pos, unsigned len, unsigned copied, | |
157 | struct page *pagep, void *fsdata) | |
ef402268 | 158 | { |
d7777a25 NP |
159 | struct inode *inode = mapping->host; |
160 | int err; | |
161 | err = generic_write_end(file, mapping, pos, len, copied, pagep, fsdata); | |
162 | if (!(err < 0) && !(MSDOS_I(inode)->i_attrs & ATTR_ARCH)) { | |
ef402268 OH |
163 | inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC; |
164 | MSDOS_I(inode)->i_attrs |= ATTR_ARCH; | |
165 | mark_inode_dirty(inode); | |
166 | } | |
167 | return err; | |
168 | } | |
169 | ||
e5174baa OH |
170 | static ssize_t fat_direct_IO(int rw, struct kiocb *iocb, |
171 | const struct iovec *iov, | |
172 | loff_t offset, unsigned long nr_segs) | |
173 | { | |
174 | struct file *file = iocb->ki_filp; | |
175 | struct inode *inode = file->f_mapping->host; | |
176 | ||
177 | if (rw == WRITE) { | |
178 | /* | |
4e02ed4b | 179 | * FIXME: blockdev_direct_IO() doesn't use ->write_begin(), |
e5174baa OH |
180 | * so we need to update the ->mmu_private to block boundary. |
181 | * | |
182 | * But we must fill the remaining area or hole by nul for | |
183 | * updating ->mmu_private. | |
94412a96 OH |
184 | * |
185 | * Return 0, and fallback to normal buffered write. | |
e5174baa OH |
186 | */ |
187 | loff_t size = offset + iov_length(iov, nr_segs); | |
188 | if (MSDOS_I(inode)->mmu_private < size) | |
94412a96 | 189 | return 0; |
e5174baa OH |
190 | } |
191 | ||
192 | /* | |
193 | * FAT need to use the DIO_LOCKING for avoiding the race | |
194 | * condition of fat_get_block() and ->truncate(). | |
195 | */ | |
196 | return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov, | |
6a1d9805 | 197 | offset, nr_segs, fat_get_block, NULL); |
e5174baa OH |
198 | } |
199 | ||
1da177e4 LT |
200 | static sector_t _fat_bmap(struct address_space *mapping, sector_t block) |
201 | { | |
fa93ca18 OH |
202 | sector_t blocknr; |
203 | ||
204 | /* fat_get_cluster() assumes the requested blocknr isn't truncated. */ | |
3a95ea11 | 205 | down_read(&mapping->host->i_alloc_sem); |
fa93ca18 | 206 | blocknr = generic_block_bmap(mapping, block, fat_get_block); |
3a95ea11 | 207 | up_read(&mapping->host->i_alloc_sem); |
fa93ca18 OH |
208 | |
209 | return blocknr; | |
1da177e4 LT |
210 | } |
211 | ||
f5e54d6e | 212 | static const struct address_space_operations fat_aops = { |
1da177e4 | 213 | .readpage = fat_readpage, |
a5425d29 | 214 | .readpages = fat_readpages, |
1da177e4 | 215 | .writepage = fat_writepage, |
a5425d29 | 216 | .writepages = fat_writepages, |
1da177e4 | 217 | .sync_page = block_sync_page, |
d7777a25 NP |
218 | .write_begin = fat_write_begin, |
219 | .write_end = fat_write_end, | |
e5174baa | 220 | .direct_IO = fat_direct_IO, |
1da177e4 LT |
221 | .bmap = _fat_bmap |
222 | }; | |
223 | ||
224 | /* | |
225 | * New FAT inode stuff. We do the following: | |
226 | * a) i_ino is constant and has nothing with on-disk location. | |
227 | * b) FAT manages its own cache of directory entries. | |
228 | * c) *This* cache is indexed by on-disk location. | |
229 | * d) inode has an associated directory entry, all right, but | |
230 | * it may be unhashed. | |
231 | * e) currently entries are stored within struct inode. That should | |
232 | * change. | |
233 | * f) we deal with races in the following way: | |
234 | * 1. readdir() and lookup() do FAT-dir-cache lookup. | |
235 | * 2. rename() unhashes the F-d-c entry and rehashes it in | |
236 | * a new place. | |
237 | * 3. unlink() and rmdir() unhash F-d-c entry. | |
238 | * 4. fat_write_inode() checks whether the thing is unhashed. | |
239 | * If it is we silently return. If it isn't we do bread(), | |
240 | * check if the location is still valid and retry if it | |
241 | * isn't. Otherwise we do changes. | |
242 | * 5. Spinlock is used to protect hash/unhash/location check/lookup | |
243 | * 6. fat_clear_inode() unhashes the F-d-c entry. | |
244 | * 7. lookup() and readdir() do igrab() if they find a F-d-c entry | |
245 | * and consider negative result as cache miss. | |
246 | */ | |
247 | ||
248 | static void fat_hash_init(struct super_block *sb) | |
249 | { | |
250 | struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
251 | int i; | |
252 | ||
253 | spin_lock_init(&sbi->inode_hash_lock); | |
254 | for (i = 0; i < FAT_HASH_SIZE; i++) | |
255 | INIT_HLIST_HEAD(&sbi->inode_hashtable[i]); | |
256 | } | |
257 | ||
d3dfa822 | 258 | static inline unsigned long fat_hash(loff_t i_pos) |
1da177e4 | 259 | { |
d3dfa822 | 260 | return hash_32(i_pos, FAT_HASH_BITS); |
1da177e4 LT |
261 | } |
262 | ||
263 | void fat_attach(struct inode *inode, loff_t i_pos) | |
264 | { | |
d3dfa822 OH |
265 | struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb); |
266 | struct hlist_head *head = sbi->inode_hashtable + fat_hash(i_pos); | |
1da177e4 LT |
267 | |
268 | spin_lock(&sbi->inode_hash_lock); | |
269 | MSDOS_I(inode)->i_pos = i_pos; | |
d3dfa822 | 270 | hlist_add_head(&MSDOS_I(inode)->i_fat_hash, head); |
1da177e4 LT |
271 | spin_unlock(&sbi->inode_hash_lock); |
272 | } | |
7c709d00 | 273 | EXPORT_SYMBOL_GPL(fat_attach); |
1da177e4 LT |
274 | |
275 | void fat_detach(struct inode *inode) | |
276 | { | |
277 | struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb); | |
278 | spin_lock(&sbi->inode_hash_lock); | |
279 | MSDOS_I(inode)->i_pos = 0; | |
280 | hlist_del_init(&MSDOS_I(inode)->i_fat_hash); | |
281 | spin_unlock(&sbi->inode_hash_lock); | |
282 | } | |
7c709d00 | 283 | EXPORT_SYMBOL_GPL(fat_detach); |
1da177e4 LT |
284 | |
285 | struct inode *fat_iget(struct super_block *sb, loff_t i_pos) | |
286 | { | |
287 | struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
d3dfa822 | 288 | struct hlist_head *head = sbi->inode_hashtable + fat_hash(i_pos); |
1da177e4 LT |
289 | struct hlist_node *_p; |
290 | struct msdos_inode_info *i; | |
291 | struct inode *inode = NULL; | |
292 | ||
293 | spin_lock(&sbi->inode_hash_lock); | |
294 | hlist_for_each_entry(i, _p, head, i_fat_hash) { | |
295 | BUG_ON(i->vfs_inode.i_sb != sb); | |
296 | if (i->i_pos != i_pos) | |
297 | continue; | |
298 | inode = igrab(&i->vfs_inode); | |
299 | if (inode) | |
300 | break; | |
301 | } | |
302 | spin_unlock(&sbi->inode_hash_lock); | |
303 | return inode; | |
304 | } | |
305 | ||
306 | static int is_exec(unsigned char *extension) | |
307 | { | |
308 | unsigned char *exe_extensions = "EXECOMBAT", *walk; | |
309 | ||
310 | for (walk = exe_extensions; *walk; walk += 3) | |
311 | if (!strncmp(extension, walk, 3)) | |
312 | return 1; | |
313 | return 0; | |
314 | } | |
315 | ||
316 | static int fat_calc_dir_size(struct inode *inode) | |
317 | { | |
318 | struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb); | |
319 | int ret, fclus, dclus; | |
320 | ||
321 | inode->i_size = 0; | |
322 | if (MSDOS_I(inode)->i_start == 0) | |
323 | return 0; | |
324 | ||
325 | ret = fat_get_cluster(inode, FAT_ENT_EOF, &fclus, &dclus); | |
326 | if (ret < 0) | |
327 | return ret; | |
328 | inode->i_size = (fclus + 1) << sbi->cluster_bits; | |
329 | ||
330 | return 0; | |
331 | } | |
332 | ||
333 | /* doesn't deal with root inode */ | |
334 | static int fat_fill_inode(struct inode *inode, struct msdos_dir_entry *de) | |
335 | { | |
336 | struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb); | |
337 | int error; | |
338 | ||
339 | MSDOS_I(inode)->i_pos = 0; | |
340 | inode->i_uid = sbi->options.fs_uid; | |
341 | inode->i_gid = sbi->options.fs_gid; | |
342 | inode->i_version++; | |
343 | inode->i_generation = get_seconds(); | |
344 | ||
345 | if ((de->attr & ATTR_DIR) && !IS_FREE(de->name)) { | |
346 | inode->i_generation &= ~1; | |
9c0aa1b8 | 347 | inode->i_mode = fat_make_mode(sbi, de->attr, S_IRWXUGO); |
1da177e4 LT |
348 | inode->i_op = sbi->dir_ops; |
349 | inode->i_fop = &fat_dir_operations; | |
350 | ||
351 | MSDOS_I(inode)->i_start = le16_to_cpu(de->start); | |
352 | if (sbi->fat_bits == 32) | |
353 | MSDOS_I(inode)->i_start |= (le16_to_cpu(de->starthi) << 16); | |
354 | ||
355 | MSDOS_I(inode)->i_logstart = MSDOS_I(inode)->i_start; | |
356 | error = fat_calc_dir_size(inode); | |
357 | if (error < 0) | |
358 | return error; | |
359 | MSDOS_I(inode)->mmu_private = inode->i_size; | |
360 | ||
361 | inode->i_nlink = fat_subdirs(inode); | |
362 | } else { /* not a directory */ | |
363 | inode->i_generation |= 1; | |
9c0aa1b8 OH |
364 | inode->i_mode = fat_make_mode(sbi, de->attr, |
365 | ((sbi->options.showexec && !is_exec(de->name + 8)) | |
366 | ? S_IRUGO|S_IWUGO : S_IRWXUGO)); | |
1da177e4 LT |
367 | MSDOS_I(inode)->i_start = le16_to_cpu(de->start); |
368 | if (sbi->fat_bits == 32) | |
369 | MSDOS_I(inode)->i_start |= (le16_to_cpu(de->starthi) << 16); | |
370 | ||
371 | MSDOS_I(inode)->i_logstart = MSDOS_I(inode)->i_start; | |
372 | inode->i_size = le32_to_cpu(de->size); | |
373 | inode->i_op = &fat_file_inode_operations; | |
374 | inode->i_fop = &fat_file_operations; | |
375 | inode->i_mapping->a_ops = &fat_aops; | |
376 | MSDOS_I(inode)->mmu_private = inode->i_size; | |
377 | } | |
378 | if (de->attr & ATTR_SYS) { | |
379 | if (sbi->options.sys_immutable) | |
380 | inode->i_flags |= S_IMMUTABLE; | |
381 | } | |
9c0aa1b8 OH |
382 | fat_save_attrs(inode, de->attr); |
383 | ||
1da177e4 LT |
384 | inode->i_blocks = ((inode->i_size + (sbi->cluster_size - 1)) |
385 | & ~((loff_t)sbi->cluster_size - 1)) >> 9; | |
7decd1cb OH |
386 | |
387 | fat_time_fat2unix(sbi, &inode->i_mtime, de->time, de->date, 0); | |
1da177e4 | 388 | if (sbi->options.isvfat) { |
7decd1cb OH |
389 | fat_time_fat2unix(sbi, &inode->i_ctime, de->ctime, |
390 | de->cdate, de->ctime_cs); | |
391 | fat_time_fat2unix(sbi, &inode->i_atime, 0, de->adate, 0); | |
1da177e4 | 392 | } else |
62a36c43 | 393 | inode->i_ctime = inode->i_atime = inode->i_mtime; |
1da177e4 LT |
394 | |
395 | return 0; | |
396 | } | |
397 | ||
398 | struct inode *fat_build_inode(struct super_block *sb, | |
399 | struct msdos_dir_entry *de, loff_t i_pos) | |
400 | { | |
401 | struct inode *inode; | |
402 | int err; | |
403 | ||
404 | inode = fat_iget(sb, i_pos); | |
405 | if (inode) | |
406 | goto out; | |
407 | inode = new_inode(sb); | |
408 | if (!inode) { | |
409 | inode = ERR_PTR(-ENOMEM); | |
410 | goto out; | |
411 | } | |
412 | inode->i_ino = iunique(sb, MSDOS_ROOT_INO); | |
413 | inode->i_version = 1; | |
414 | err = fat_fill_inode(inode, de); | |
415 | if (err) { | |
416 | iput(inode); | |
417 | inode = ERR_PTR(err); | |
418 | goto out; | |
419 | } | |
420 | fat_attach(inode, i_pos); | |
421 | insert_inode_hash(inode); | |
422 | out: | |
423 | return inode; | |
424 | } | |
425 | ||
7c709d00 | 426 | EXPORT_SYMBOL_GPL(fat_build_inode); |
1da177e4 LT |
427 | |
428 | static void fat_delete_inode(struct inode *inode) | |
429 | { | |
fef26658 | 430 | truncate_inode_pages(&inode->i_data, 0); |
3754a544 OH |
431 | inode->i_size = 0; |
432 | fat_truncate(inode); | |
1da177e4 LT |
433 | clear_inode(inode); |
434 | } | |
435 | ||
436 | static void fat_clear_inode(struct inode *inode) | |
437 | { | |
1da177e4 | 438 | fat_cache_inval_inode(inode); |
a993b542 | 439 | fat_detach(inode); |
1da177e4 LT |
440 | } |
441 | ||
a6bf6b21 | 442 | static void fat_write_super(struct super_block *sb) |
1da177e4 | 443 | { |
ebc1ac16 | 444 | lock_super(sb); |
a6bf6b21 | 445 | sb->s_dirt = 0; |
1da177e4 LT |
446 | |
447 | if (!(sb->s_flags & MS_RDONLY)) | |
448 | fat_clusters_flush(sb); | |
ebc1ac16 | 449 | unlock_super(sb); |
a6bf6b21 OH |
450 | } |
451 | ||
452 | static void fat_put_super(struct super_block *sb) | |
453 | { | |
454 | struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
1da177e4 | 455 | |
6cfd0148 CH |
456 | lock_kernel(); |
457 | ||
8c85e125 CH |
458 | if (sb->s_dirt) |
459 | fat_write_super(sb); | |
460 | ||
1da177e4 LT |
461 | if (sbi->nls_disk) { |
462 | unload_nls(sbi->nls_disk); | |
463 | sbi->nls_disk = NULL; | |
464 | sbi->options.codepage = fat_default_codepage; | |
465 | } | |
466 | if (sbi->nls_io) { | |
467 | unload_nls(sbi->nls_io); | |
468 | sbi->nls_io = NULL; | |
469 | } | |
470 | if (sbi->options.iocharset != fat_default_iocharset) { | |
471 | kfree(sbi->options.iocharset); | |
472 | sbi->options.iocharset = fat_default_iocharset; | |
473 | } | |
474 | ||
475 | sb->s_fs_info = NULL; | |
476 | kfree(sbi); | |
6cfd0148 CH |
477 | |
478 | unlock_kernel(); | |
1da177e4 LT |
479 | } |
480 | ||
e18b890b | 481 | static struct kmem_cache *fat_inode_cachep; |
1da177e4 LT |
482 | |
483 | static struct inode *fat_alloc_inode(struct super_block *sb) | |
484 | { | |
485 | struct msdos_inode_info *ei; | |
8f593427 | 486 | ei = kmem_cache_alloc(fat_inode_cachep, GFP_NOFS); |
1da177e4 LT |
487 | if (!ei) |
488 | return NULL; | |
489 | return &ei->vfs_inode; | |
490 | } | |
491 | ||
492 | static void fat_destroy_inode(struct inode *inode) | |
493 | { | |
494 | kmem_cache_free(fat_inode_cachep, MSDOS_I(inode)); | |
495 | } | |
496 | ||
51cc5068 | 497 | static void init_once(void *foo) |
1da177e4 LT |
498 | { |
499 | struct msdos_inode_info *ei = (struct msdos_inode_info *)foo; | |
500 | ||
a35afb83 CL |
501 | spin_lock_init(&ei->cache_lru_lock); |
502 | ei->nr_caches = 0; | |
503 | ei->cache_valid_id = FAT_CACHE_VALID + 1; | |
504 | INIT_LIST_HEAD(&ei->cache_lru); | |
505 | INIT_HLIST_NODE(&ei->i_fat_hash); | |
506 | inode_init_once(&ei->vfs_inode); | |
1da177e4 LT |
507 | } |
508 | ||
509 | static int __init fat_init_inodecache(void) | |
510 | { | |
511 | fat_inode_cachep = kmem_cache_create("fat_inode_cache", | |
512 | sizeof(struct msdos_inode_info), | |
fffb60f9 PJ |
513 | 0, (SLAB_RECLAIM_ACCOUNT| |
514 | SLAB_MEM_SPREAD), | |
20c2df83 | 515 | init_once); |
1da177e4 LT |
516 | if (fat_inode_cachep == NULL) |
517 | return -ENOMEM; | |
518 | return 0; | |
519 | } | |
520 | ||
521 | static void __exit fat_destroy_inodecache(void) | |
522 | { | |
1a1d92c1 | 523 | kmem_cache_destroy(fat_inode_cachep); |
1da177e4 LT |
524 | } |
525 | ||
526 | static int fat_remount(struct super_block *sb, int *flags, char *data) | |
527 | { | |
528 | struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
529 | *flags |= MS_NODIRATIME | (sbi->options.isvfat ? 0 : MS_NOATIME); | |
530 | return 0; | |
531 | } | |
532 | ||
726c3342 | 533 | static int fat_statfs(struct dentry *dentry, struct kstatfs *buf) |
1da177e4 | 534 | { |
aac49b75 CL |
535 | struct super_block *sb = dentry->d_sb; |
536 | struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
537 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); | |
1da177e4 LT |
538 | |
539 | /* If the count of free cluster is still unknown, counts it here. */ | |
606e423e | 540 | if (sbi->free_clusters == -1 || !sbi->free_clus_valid) { |
726c3342 | 541 | int err = fat_count_free_clusters(dentry->d_sb); |
1da177e4 LT |
542 | if (err) |
543 | return err; | |
544 | } | |
545 | ||
726c3342 | 546 | buf->f_type = dentry->d_sb->s_magic; |
1da177e4 LT |
547 | buf->f_bsize = sbi->cluster_size; |
548 | buf->f_blocks = sbi->max_cluster - FAT_START_ENT; | |
549 | buf->f_bfree = sbi->free_clusters; | |
550 | buf->f_bavail = sbi->free_clusters; | |
aac49b75 CL |
551 | buf->f_fsid.val[0] = (u32)id; |
552 | buf->f_fsid.val[1] = (u32)(id >> 32); | |
1da177e4 LT |
553 | buf->f_namelen = sbi->options.isvfat ? 260 : 12; |
554 | ||
555 | return 0; | |
556 | } | |
557 | ||
9ca59f4c OH |
558 | static inline loff_t fat_i_pos_read(struct msdos_sb_info *sbi, |
559 | struct inode *inode) | |
560 | { | |
561 | loff_t i_pos; | |
562 | #if BITS_PER_LONG == 32 | |
563 | spin_lock(&sbi->inode_hash_lock); | |
564 | #endif | |
565 | i_pos = MSDOS_I(inode)->i_pos; | |
566 | #if BITS_PER_LONG == 32 | |
567 | spin_unlock(&sbi->inode_hash_lock); | |
568 | #endif | |
569 | return i_pos; | |
570 | } | |
571 | ||
1da177e4 LT |
572 | static int fat_write_inode(struct inode *inode, int wait) |
573 | { | |
574 | struct super_block *sb = inode->i_sb; | |
575 | struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
576 | struct buffer_head *bh; | |
577 | struct msdos_dir_entry *raw_entry; | |
578 | loff_t i_pos; | |
5f22ca9b | 579 | int err; |
1da177e4 | 580 | |
9ca59f4c OH |
581 | if (inode->i_ino == MSDOS_ROOT_INO) |
582 | return 0; | |
583 | ||
1da177e4 | 584 | retry: |
9ca59f4c OH |
585 | i_pos = fat_i_pos_read(sbi, inode); |
586 | if (!i_pos) | |
1da177e4 LT |
587 | return 0; |
588 | ||
1da177e4 LT |
589 | bh = sb_bread(sb, i_pos >> sbi->dir_per_block_bits); |
590 | if (!bh) { | |
591 | printk(KERN_ERR "FAT: unable to read inode block " | |
592 | "for updating (i_pos %lld)\n", i_pos); | |
5f22ca9b | 593 | return -EIO; |
1da177e4 LT |
594 | } |
595 | spin_lock(&sbi->inode_hash_lock); | |
596 | if (i_pos != MSDOS_I(inode)->i_pos) { | |
597 | spin_unlock(&sbi->inode_hash_lock); | |
598 | brelse(bh); | |
1da177e4 LT |
599 | goto retry; |
600 | } | |
601 | ||
602 | raw_entry = &((struct msdos_dir_entry *) (bh->b_data)) | |
603 | [i_pos & (sbi->dir_per_block - 1)]; | |
604 | if (S_ISDIR(inode->i_mode)) | |
605 | raw_entry->size = 0; | |
606 | else | |
607 | raw_entry->size = cpu_to_le32(inode->i_size); | |
9c0aa1b8 | 608 | raw_entry->attr = fat_make_attrs(inode); |
1da177e4 LT |
609 | raw_entry->start = cpu_to_le16(MSDOS_I(inode)->i_logstart); |
610 | raw_entry->starthi = cpu_to_le16(MSDOS_I(inode)->i_logstart >> 16); | |
7decd1cb OH |
611 | fat_time_unix2fat(sbi, &inode->i_mtime, &raw_entry->time, |
612 | &raw_entry->date, NULL); | |
1da177e4 | 613 | if (sbi->options.isvfat) { |
62a36c43 | 614 | __le16 atime; |
7decd1cb OH |
615 | fat_time_unix2fat(sbi, &inode->i_ctime, &raw_entry->ctime, |
616 | &raw_entry->cdate, &raw_entry->ctime_cs); | |
617 | fat_time_unix2fat(sbi, &inode->i_atime, &atime, | |
618 | &raw_entry->adate, NULL); | |
1da177e4 LT |
619 | } |
620 | spin_unlock(&sbi->inode_hash_lock); | |
621 | mark_buffer_dirty(bh); | |
5f22ca9b | 622 | err = 0; |
1da177e4 LT |
623 | if (wait) |
624 | err = sync_dirty_buffer(bh); | |
625 | brelse(bh); | |
1da177e4 LT |
626 | return err; |
627 | } | |
628 | ||
629 | int fat_sync_inode(struct inode *inode) | |
630 | { | |
631 | return fat_write_inode(inode, 1); | |
632 | } | |
633 | ||
7c709d00 | 634 | EXPORT_SYMBOL_GPL(fat_sync_inode); |
1da177e4 LT |
635 | |
636 | static int fat_show_options(struct seq_file *m, struct vfsmount *mnt); | |
ee9b6d61 | 637 | static const struct super_operations fat_sops = { |
1da177e4 LT |
638 | .alloc_inode = fat_alloc_inode, |
639 | .destroy_inode = fat_destroy_inode, | |
640 | .write_inode = fat_write_inode, | |
641 | .delete_inode = fat_delete_inode, | |
642 | .put_super = fat_put_super, | |
a6bf6b21 | 643 | .write_super = fat_write_super, |
1da177e4 LT |
644 | .statfs = fat_statfs, |
645 | .clear_inode = fat_clear_inode, | |
646 | .remount_fs = fat_remount, | |
647 | ||
1da177e4 LT |
648 | .show_options = fat_show_options, |
649 | }; | |
650 | ||
651 | /* | |
652 | * a FAT file handle with fhtype 3 is | |
653 | * 0/ i_ino - for fast, reliable lookup if still in the cache | |
654 | * 1/ i_generation - to see if i_ino is still valid | |
655 | * bit 0 == 0 iff directory | |
656 | * 2/ i_pos(8-39) - if ino has changed, but still in cache | |
657 | * 3/ i_pos(4-7)|i_logstart - to semi-verify inode found at i_pos | |
658 | * 4/ i_pos(0-3)|parent->i_logstart - maybe used to hunt for the file on disc | |
659 | * | |
660 | * Hack for NFSv2: Maximum FAT entry number is 28bits and maximum | |
661 | * i_pos is 40bits (blocknr(32) + dir offset(8)), so two 4bits | |
662 | * of i_logstart is used to store the directory entry offset. | |
663 | */ | |
664 | ||
1305edad CH |
665 | static struct dentry *fat_fh_to_dentry(struct super_block *sb, |
666 | struct fid *fid, int fh_len, int fh_type) | |
1da177e4 LT |
667 | { |
668 | struct inode *inode = NULL; | |
669 | struct dentry *result; | |
1305edad CH |
670 | u32 *fh = fid->raw; |
671 | ||
672 | if (fh_len < 5 || fh_type != 3) | |
673 | return NULL; | |
1da177e4 | 674 | |
17f95a7b DH |
675 | inode = ilookup(sb, fh[0]); |
676 | if (!inode || inode->i_generation != fh[1]) { | |
1da177e4 LT |
677 | if (inode) |
678 | iput(inode); | |
679 | inode = NULL; | |
680 | } | |
681 | if (!inode) { | |
682 | loff_t i_pos; | |
683 | int i_logstart = fh[3] & 0x0fffffff; | |
684 | ||
685 | i_pos = (loff_t)fh[2] << 8; | |
686 | i_pos |= ((fh[3] >> 24) & 0xf0) | (fh[4] >> 28); | |
687 | ||
688 | /* try 2 - see if i_pos is in F-d-c | |
689 | * require i_logstart to be the same | |
690 | * Will fail if you truncate and then re-write | |
691 | */ | |
692 | ||
693 | inode = fat_iget(sb, i_pos); | |
694 | if (inode && MSDOS_I(inode)->i_logstart != i_logstart) { | |
695 | iput(inode); | |
696 | inode = NULL; | |
697 | } | |
698 | } | |
1da177e4 | 699 | |
44003728 CH |
700 | /* |
701 | * For now, do nothing if the inode is not found. | |
702 | * | |
703 | * What we could do is: | |
704 | * | |
705 | * - follow the file starting at fh[4], and record the ".." entry, | |
706 | * and the name of the fh[2] entry. | |
707 | * - then follow the ".." file finding the next step up. | |
708 | * | |
709 | * This way we build a path to the root of the tree. If this works, we | |
710 | * lookup the path and so get this inode into the cache. Finally try | |
711 | * the fat_iget lookup again. If that fails, then we are totally out | |
712 | * of luck. But all that is for another day | |
1da177e4 | 713 | */ |
44003728 CH |
714 | result = d_obtain_alias(inode); |
715 | if (!IS_ERR(result)) | |
716 | result->d_op = sb->s_root->d_op; | |
1da177e4 LT |
717 | return result; |
718 | } | |
719 | ||
720 | static int | |
721 | fat_encode_fh(struct dentry *de, __u32 *fh, int *lenp, int connectable) | |
722 | { | |
723 | int len = *lenp; | |
724 | struct inode *inode = de->d_inode; | |
725 | u32 ipos_h, ipos_m, ipos_l; | |
726 | ||
727 | if (len < 5) | |
728 | return 255; /* no room */ | |
729 | ||
730 | ipos_h = MSDOS_I(inode)->i_pos >> 8; | |
731 | ipos_m = (MSDOS_I(inode)->i_pos & 0xf0) << 24; | |
732 | ipos_l = (MSDOS_I(inode)->i_pos & 0x0f) << 28; | |
733 | *lenp = 5; | |
734 | fh[0] = inode->i_ino; | |
735 | fh[1] = inode->i_generation; | |
736 | fh[2] = ipos_h; | |
737 | fh[3] = ipos_m | MSDOS_I(inode)->i_logstart; | |
738 | spin_lock(&de->d_lock); | |
739 | fh[4] = ipos_l | MSDOS_I(de->d_parent->d_inode)->i_logstart; | |
740 | spin_unlock(&de->d_lock); | |
741 | return 3; | |
742 | } | |
743 | ||
744 | static struct dentry *fat_get_parent(struct dentry *child) | |
745 | { | |
8f593427 | 746 | struct super_block *sb = child->d_sb; |
1da177e4 LT |
747 | struct buffer_head *bh; |
748 | struct msdos_dir_entry *de; | |
749 | loff_t i_pos; | |
750 | struct dentry *parent; | |
751 | struct inode *inode; | |
752 | int err; | |
753 | ||
8f593427 | 754 | lock_super(sb); |
1da177e4 LT |
755 | |
756 | err = fat_get_dotdot_entry(child->d_inode, &bh, &de, &i_pos); | |
757 | if (err) { | |
758 | parent = ERR_PTR(err); | |
759 | goto out; | |
760 | } | |
8f593427 | 761 | inode = fat_build_inode(sb, de, i_pos); |
1da177e4 | 762 | brelse(bh); |
44003728 CH |
763 | |
764 | parent = d_obtain_alias(inode); | |
5a6bb103 CH |
765 | if (!IS_ERR(parent)) |
766 | parent->d_op = sb->s_root->d_op; | |
1da177e4 | 767 | out: |
8f593427 | 768 | unlock_super(sb); |
1da177e4 LT |
769 | |
770 | return parent; | |
771 | } | |
772 | ||
39655164 | 773 | static const struct export_operations fat_export_ops = { |
1da177e4 | 774 | .encode_fh = fat_encode_fh, |
1305edad | 775 | .fh_to_dentry = fat_fh_to_dentry, |
1da177e4 LT |
776 | .get_parent = fat_get_parent, |
777 | }; | |
778 | ||
779 | static int fat_show_options(struct seq_file *m, struct vfsmount *mnt) | |
780 | { | |
781 | struct msdos_sb_info *sbi = MSDOS_SB(mnt->mnt_sb); | |
782 | struct fat_mount_options *opts = &sbi->options; | |
783 | int isvfat = opts->isvfat; | |
784 | ||
785 | if (opts->fs_uid != 0) | |
786 | seq_printf(m, ",uid=%u", opts->fs_uid); | |
787 | if (opts->fs_gid != 0) | |
788 | seq_printf(m, ",gid=%u", opts->fs_gid); | |
789 | seq_printf(m, ",fmask=%04o", opts->fs_fmask); | |
790 | seq_printf(m, ",dmask=%04o", opts->fs_dmask); | |
1ae43f82 OH |
791 | if (opts->allow_utime) |
792 | seq_printf(m, ",allow_utime=%04o", opts->allow_utime); | |
1da177e4 LT |
793 | if (sbi->nls_disk) |
794 | seq_printf(m, ",codepage=%s", sbi->nls_disk->charset); | |
795 | if (isvfat) { | |
796 | if (sbi->nls_io) | |
797 | seq_printf(m, ",iocharset=%s", sbi->nls_io->charset); | |
798 | ||
799 | switch (opts->shortname) { | |
800 | case VFAT_SFN_DISPLAY_WIN95 | VFAT_SFN_CREATE_WIN95: | |
801 | seq_puts(m, ",shortname=win95"); | |
802 | break; | |
803 | case VFAT_SFN_DISPLAY_WINNT | VFAT_SFN_CREATE_WINNT: | |
804 | seq_puts(m, ",shortname=winnt"); | |
805 | break; | |
806 | case VFAT_SFN_DISPLAY_WINNT | VFAT_SFN_CREATE_WIN95: | |
807 | seq_puts(m, ",shortname=mixed"); | |
808 | break; | |
809 | case VFAT_SFN_DISPLAY_LOWER | VFAT_SFN_CREATE_WIN95: | |
810 | /* seq_puts(m, ",shortname=lower"); */ | |
811 | break; | |
812 | default: | |
813 | seq_puts(m, ",shortname=unknown"); | |
814 | break; | |
815 | } | |
816 | } | |
817 | if (opts->name_check != 'n') | |
818 | seq_printf(m, ",check=%c", opts->name_check); | |
28ec039c OH |
819 | if (opts->usefree) |
820 | seq_puts(m, ",usefree"); | |
1da177e4 LT |
821 | if (opts->quiet) |
822 | seq_puts(m, ",quiet"); | |
823 | if (opts->showexec) | |
824 | seq_puts(m, ",showexec"); | |
825 | if (opts->sys_immutable) | |
826 | seq_puts(m, ",sys_immutable"); | |
827 | if (!isvfat) { | |
828 | if (opts->dotsOK) | |
829 | seq_puts(m, ",dotsOK=yes"); | |
830 | if (opts->nocase) | |
831 | seq_puts(m, ",nocase"); | |
832 | } else { | |
833 | if (opts->utf8) | |
834 | seq_puts(m, ",utf8"); | |
835 | if (opts->unicode_xlate) | |
836 | seq_puts(m, ",uni_xlate"); | |
837 | if (!opts->numtail) | |
838 | seq_puts(m, ",nonumtail"); | |
dfc209c0 OH |
839 | if (opts->rodir) |
840 | seq_puts(m, ",rodir"); | |
1da177e4 | 841 | } |
dfc209c0 | 842 | if (opts->flush) |
c1fca3b6 | 843 | seq_puts(m, ",flush"); |
b271e067 JP |
844 | if (opts->tz_utc) |
845 | seq_puts(m, ",tz=UTC"); | |
1da177e4 LT |
846 | |
847 | return 0; | |
848 | } | |
849 | ||
850 | enum { | |
851 | Opt_check_n, Opt_check_r, Opt_check_s, Opt_uid, Opt_gid, | |
1ae43f82 OH |
852 | Opt_umask, Opt_dmask, Opt_fmask, Opt_allow_utime, Opt_codepage, |
853 | Opt_usefree, Opt_nocase, Opt_quiet, Opt_showexec, Opt_debug, | |
854 | Opt_immutable, Opt_dots, Opt_nodots, | |
1da177e4 LT |
855 | Opt_charset, Opt_shortname_lower, Opt_shortname_win95, |
856 | Opt_shortname_winnt, Opt_shortname_mixed, Opt_utf8_no, Opt_utf8_yes, | |
857 | Opt_uni_xl_no, Opt_uni_xl_yes, Opt_nonumtail_no, Opt_nonumtail_yes, | |
dfc209c0 | 858 | Opt_obsolate, Opt_flush, Opt_tz_utc, Opt_rodir, Opt_err, |
1da177e4 LT |
859 | }; |
860 | ||
a447c093 | 861 | static const match_table_t fat_tokens = { |
1da177e4 LT |
862 | {Opt_check_r, "check=relaxed"}, |
863 | {Opt_check_s, "check=strict"}, | |
864 | {Opt_check_n, "check=normal"}, | |
865 | {Opt_check_r, "check=r"}, | |
866 | {Opt_check_s, "check=s"}, | |
867 | {Opt_check_n, "check=n"}, | |
868 | {Opt_uid, "uid=%u"}, | |
869 | {Opt_gid, "gid=%u"}, | |
870 | {Opt_umask, "umask=%o"}, | |
871 | {Opt_dmask, "dmask=%o"}, | |
872 | {Opt_fmask, "fmask=%o"}, | |
1ae43f82 | 873 | {Opt_allow_utime, "allow_utime=%o"}, |
1da177e4 | 874 | {Opt_codepage, "codepage=%u"}, |
28ec039c | 875 | {Opt_usefree, "usefree"}, |
1da177e4 LT |
876 | {Opt_nocase, "nocase"}, |
877 | {Opt_quiet, "quiet"}, | |
878 | {Opt_showexec, "showexec"}, | |
879 | {Opt_debug, "debug"}, | |
880 | {Opt_immutable, "sys_immutable"}, | |
881 | {Opt_obsolate, "conv=binary"}, | |
882 | {Opt_obsolate, "conv=text"}, | |
883 | {Opt_obsolate, "conv=auto"}, | |
884 | {Opt_obsolate, "conv=b"}, | |
885 | {Opt_obsolate, "conv=t"}, | |
886 | {Opt_obsolate, "conv=a"}, | |
887 | {Opt_obsolate, "fat=%u"}, | |
888 | {Opt_obsolate, "blocksize=%u"}, | |
889 | {Opt_obsolate, "cvf_format=%20s"}, | |
890 | {Opt_obsolate, "cvf_options=%100s"}, | |
891 | {Opt_obsolate, "posix"}, | |
ae78bf9c | 892 | {Opt_flush, "flush"}, |
b271e067 | 893 | {Opt_tz_utc, "tz=UTC"}, |
ae78bf9c | 894 | {Opt_err, NULL}, |
1da177e4 | 895 | }; |
a447c093 | 896 | static const match_table_t msdos_tokens = { |
1da177e4 LT |
897 | {Opt_nodots, "nodots"}, |
898 | {Opt_nodots, "dotsOK=no"}, | |
899 | {Opt_dots, "dots"}, | |
900 | {Opt_dots, "dotsOK=yes"}, | |
901 | {Opt_err, NULL} | |
902 | }; | |
a447c093 | 903 | static const match_table_t vfat_tokens = { |
1da177e4 LT |
904 | {Opt_charset, "iocharset=%s"}, |
905 | {Opt_shortname_lower, "shortname=lower"}, | |
906 | {Opt_shortname_win95, "shortname=win95"}, | |
907 | {Opt_shortname_winnt, "shortname=winnt"}, | |
908 | {Opt_shortname_mixed, "shortname=mixed"}, | |
909 | {Opt_utf8_no, "utf8=0"}, /* 0 or no or false */ | |
910 | {Opt_utf8_no, "utf8=no"}, | |
911 | {Opt_utf8_no, "utf8=false"}, | |
912 | {Opt_utf8_yes, "utf8=1"}, /* empty or 1 or yes or true */ | |
913 | {Opt_utf8_yes, "utf8=yes"}, | |
914 | {Opt_utf8_yes, "utf8=true"}, | |
915 | {Opt_utf8_yes, "utf8"}, | |
916 | {Opt_uni_xl_no, "uni_xlate=0"}, /* 0 or no or false */ | |
917 | {Opt_uni_xl_no, "uni_xlate=no"}, | |
918 | {Opt_uni_xl_no, "uni_xlate=false"}, | |
919 | {Opt_uni_xl_yes, "uni_xlate=1"}, /* empty or 1 or yes or true */ | |
920 | {Opt_uni_xl_yes, "uni_xlate=yes"}, | |
921 | {Opt_uni_xl_yes, "uni_xlate=true"}, | |
922 | {Opt_uni_xl_yes, "uni_xlate"}, | |
923 | {Opt_nonumtail_no, "nonumtail=0"}, /* 0 or no or false */ | |
924 | {Opt_nonumtail_no, "nonumtail=no"}, | |
925 | {Opt_nonumtail_no, "nonumtail=false"}, | |
926 | {Opt_nonumtail_yes, "nonumtail=1"}, /* empty or 1 or yes or true */ | |
927 | {Opt_nonumtail_yes, "nonumtail=yes"}, | |
928 | {Opt_nonumtail_yes, "nonumtail=true"}, | |
929 | {Opt_nonumtail_yes, "nonumtail"}, | |
dfc209c0 | 930 | {Opt_rodir, "rodir"}, |
1da177e4 LT |
931 | {Opt_err, NULL} |
932 | }; | |
933 | ||
41a34a4f | 934 | static int parse_options(char *options, int is_vfat, int silent, int *debug, |
1da177e4 LT |
935 | struct fat_mount_options *opts) |
936 | { | |
937 | char *p; | |
938 | substring_t args[MAX_OPT_ARGS]; | |
939 | int option; | |
940 | char *iocharset; | |
941 | ||
942 | opts->isvfat = is_vfat; | |
943 | ||
f0ce7ee3 DH |
944 | opts->fs_uid = current_uid(); |
945 | opts->fs_gid = current_gid(); | |
ce3b0f8d | 946 | opts->fs_fmask = current_umask(); |
1ae43f82 | 947 | opts->allow_utime = -1; |
1da177e4 LT |
948 | opts->codepage = fat_default_codepage; |
949 | opts->iocharset = fat_default_iocharset; | |
dfc209c0 | 950 | if (is_vfat) { |
1da177e4 | 951 | opts->shortname = VFAT_SFN_DISPLAY_LOWER|VFAT_SFN_CREATE_WIN95; |
dfc209c0 OH |
952 | opts->rodir = 0; |
953 | } else { | |
1da177e4 | 954 | opts->shortname = 0; |
dfc209c0 OH |
955 | opts->rodir = 1; |
956 | } | |
1da177e4 LT |
957 | opts->name_check = 'n'; |
958 | opts->quiet = opts->showexec = opts->sys_immutable = opts->dotsOK = 0; | |
959 | opts->utf8 = opts->unicode_xlate = 0; | |
960 | opts->numtail = 1; | |
28ec039c | 961 | opts->usefree = opts->nocase = 0; |
b271e067 | 962 | opts->tz_utc = 0; |
1da177e4 LT |
963 | *debug = 0; |
964 | ||
965 | if (!options) | |
8d44d974 | 966 | goto out; |
1da177e4 LT |
967 | |
968 | while ((p = strsep(&options, ",")) != NULL) { | |
969 | int token; | |
970 | if (!*p) | |
971 | continue; | |
972 | ||
973 | token = match_token(p, fat_tokens, args); | |
974 | if (token == Opt_err) { | |
975 | if (is_vfat) | |
976 | token = match_token(p, vfat_tokens, args); | |
977 | else | |
978 | token = match_token(p, msdos_tokens, args); | |
979 | } | |
980 | switch (token) { | |
981 | case Opt_check_s: | |
982 | opts->name_check = 's'; | |
983 | break; | |
984 | case Opt_check_r: | |
985 | opts->name_check = 'r'; | |
986 | break; | |
987 | case Opt_check_n: | |
988 | opts->name_check = 'n'; | |
989 | break; | |
28ec039c OH |
990 | case Opt_usefree: |
991 | opts->usefree = 1; | |
992 | break; | |
1da177e4 LT |
993 | case Opt_nocase: |
994 | if (!is_vfat) | |
995 | opts->nocase = 1; | |
996 | else { | |
997 | /* for backward compatibility */ | |
998 | opts->shortname = VFAT_SFN_DISPLAY_WIN95 | |
999 | | VFAT_SFN_CREATE_WIN95; | |
1000 | } | |
1001 | break; | |
1002 | case Opt_quiet: | |
1003 | opts->quiet = 1; | |
1004 | break; | |
1005 | case Opt_showexec: | |
1006 | opts->showexec = 1; | |
1007 | break; | |
1008 | case Opt_debug: | |
1009 | *debug = 1; | |
1010 | break; | |
1011 | case Opt_immutable: | |
1012 | opts->sys_immutable = 1; | |
1013 | break; | |
1014 | case Opt_uid: | |
1015 | if (match_int(&args[0], &option)) | |
1016 | return 0; | |
1017 | opts->fs_uid = option; | |
1018 | break; | |
1019 | case Opt_gid: | |
1020 | if (match_int(&args[0], &option)) | |
1021 | return 0; | |
1022 | opts->fs_gid = option; | |
1023 | break; | |
1024 | case Opt_umask: | |
1025 | if (match_octal(&args[0], &option)) | |
1026 | return 0; | |
1027 | opts->fs_fmask = opts->fs_dmask = option; | |
1028 | break; | |
1029 | case Opt_dmask: | |
1030 | if (match_octal(&args[0], &option)) | |
1031 | return 0; | |
1032 | opts->fs_dmask = option; | |
1033 | break; | |
1034 | case Opt_fmask: | |
1035 | if (match_octal(&args[0], &option)) | |
1036 | return 0; | |
1037 | opts->fs_fmask = option; | |
1038 | break; | |
1ae43f82 OH |
1039 | case Opt_allow_utime: |
1040 | if (match_octal(&args[0], &option)) | |
1041 | return 0; | |
1042 | opts->allow_utime = option & (S_IWGRP | S_IWOTH); | |
1043 | break; | |
1da177e4 LT |
1044 | case Opt_codepage: |
1045 | if (match_int(&args[0], &option)) | |
1046 | return 0; | |
1047 | opts->codepage = option; | |
1048 | break; | |
ae78bf9c CM |
1049 | case Opt_flush: |
1050 | opts->flush = 1; | |
1051 | break; | |
b271e067 JP |
1052 | case Opt_tz_utc: |
1053 | opts->tz_utc = 1; | |
1054 | break; | |
1da177e4 LT |
1055 | |
1056 | /* msdos specific */ | |
1057 | case Opt_dots: | |
1058 | opts->dotsOK = 1; | |
1059 | break; | |
1060 | case Opt_nodots: | |
1061 | opts->dotsOK = 0; | |
1062 | break; | |
1063 | ||
1064 | /* vfat specific */ | |
1065 | case Opt_charset: | |
1066 | if (opts->iocharset != fat_default_iocharset) | |
1067 | kfree(opts->iocharset); | |
1068 | iocharset = match_strdup(&args[0]); | |
1069 | if (!iocharset) | |
1070 | return -ENOMEM; | |
1071 | opts->iocharset = iocharset; | |
1072 | break; | |
1073 | case Opt_shortname_lower: | |
1074 | opts->shortname = VFAT_SFN_DISPLAY_LOWER | |
1075 | | VFAT_SFN_CREATE_WIN95; | |
1076 | break; | |
1077 | case Opt_shortname_win95: | |
1078 | opts->shortname = VFAT_SFN_DISPLAY_WIN95 | |
1079 | | VFAT_SFN_CREATE_WIN95; | |
1080 | break; | |
1081 | case Opt_shortname_winnt: | |
1082 | opts->shortname = VFAT_SFN_DISPLAY_WINNT | |
1083 | | VFAT_SFN_CREATE_WINNT; | |
1084 | break; | |
1085 | case Opt_shortname_mixed: | |
1086 | opts->shortname = VFAT_SFN_DISPLAY_WINNT | |
1087 | | VFAT_SFN_CREATE_WIN95; | |
1088 | break; | |
1089 | case Opt_utf8_no: /* 0 or no or false */ | |
1090 | opts->utf8 = 0; | |
1091 | break; | |
1092 | case Opt_utf8_yes: /* empty or 1 or yes or true */ | |
1093 | opts->utf8 = 1; | |
1094 | break; | |
1095 | case Opt_uni_xl_no: /* 0 or no or false */ | |
1096 | opts->unicode_xlate = 0; | |
1097 | break; | |
1098 | case Opt_uni_xl_yes: /* empty or 1 or yes or true */ | |
1099 | opts->unicode_xlate = 1; | |
1100 | break; | |
1101 | case Opt_nonumtail_no: /* 0 or no or false */ | |
1102 | opts->numtail = 1; /* negated option */ | |
1103 | break; | |
1104 | case Opt_nonumtail_yes: /* empty or 1 or yes or true */ | |
1105 | opts->numtail = 0; /* negated option */ | |
1106 | break; | |
dfc209c0 OH |
1107 | case Opt_rodir: |
1108 | opts->rodir = 1; | |
1109 | break; | |
1da177e4 LT |
1110 | |
1111 | /* obsolete mount options */ | |
1112 | case Opt_obsolate: | |
1113 | printk(KERN_INFO "FAT: \"%s\" option is obsolete, " | |
1114 | "not supported now\n", p); | |
1115 | break; | |
1116 | /* unknown option */ | |
1117 | default: | |
41a34a4f CH |
1118 | if (!silent) { |
1119 | printk(KERN_ERR | |
1120 | "FAT: Unrecognized mount option \"%s\" " | |
1121 | "or missing value\n", p); | |
1122 | } | |
1da177e4 LT |
1123 | return -EINVAL; |
1124 | } | |
1125 | } | |
8d44d974 OH |
1126 | |
1127 | out: | |
4de151d8 | 1128 | /* UTF-8 doesn't provide FAT semantics */ |
1da177e4 LT |
1129 | if (!strcmp(opts->iocharset, "utf8")) { |
1130 | printk(KERN_ERR "FAT: utf8 is not a recommended IO charset" | |
8d44d974 OH |
1131 | " for FAT filesystems, filesystem will be " |
1132 | "case sensitive!\n"); | |
1da177e4 LT |
1133 | } |
1134 | ||
1ae43f82 OH |
1135 | /* If user doesn't specify allow_utime, it's initialized from dmask. */ |
1136 | if (opts->allow_utime == (unsigned short)-1) | |
1137 | opts->allow_utime = ~opts->fs_dmask & (S_IWGRP | S_IWOTH); | |
1da177e4 LT |
1138 | if (opts->unicode_xlate) |
1139 | opts->utf8 = 0; | |
1140 | ||
1141 | return 0; | |
1142 | } | |
1143 | ||
1144 | static int fat_read_root(struct inode *inode) | |
1145 | { | |
1146 | struct super_block *sb = inode->i_sb; | |
1147 | struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
1148 | int error; | |
1149 | ||
1150 | MSDOS_I(inode)->i_pos = 0; | |
1151 | inode->i_uid = sbi->options.fs_uid; | |
1152 | inode->i_gid = sbi->options.fs_gid; | |
1153 | inode->i_version++; | |
1154 | inode->i_generation = 0; | |
9c0aa1b8 | 1155 | inode->i_mode = fat_make_mode(sbi, ATTR_DIR, S_IRWXUGO); |
1da177e4 LT |
1156 | inode->i_op = sbi->dir_ops; |
1157 | inode->i_fop = &fat_dir_operations; | |
1158 | if (sbi->fat_bits == 32) { | |
1159 | MSDOS_I(inode)->i_start = sbi->root_cluster; | |
1160 | error = fat_calc_dir_size(inode); | |
1161 | if (error < 0) | |
1162 | return error; | |
1163 | } else { | |
1164 | MSDOS_I(inode)->i_start = 0; | |
1165 | inode->i_size = sbi->dir_entries * sizeof(struct msdos_dir_entry); | |
1166 | } | |
1da177e4 LT |
1167 | inode->i_blocks = ((inode->i_size + (sbi->cluster_size - 1)) |
1168 | & ~((loff_t)sbi->cluster_size - 1)) >> 9; | |
1169 | MSDOS_I(inode)->i_logstart = 0; | |
1170 | MSDOS_I(inode)->mmu_private = inode->i_size; | |
1171 | ||
9c0aa1b8 | 1172 | fat_save_attrs(inode, ATTR_DIR); |
1da177e4 LT |
1173 | inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = 0; |
1174 | inode->i_mtime.tv_nsec = inode->i_atime.tv_nsec = inode->i_ctime.tv_nsec = 0; | |
1175 | inode->i_nlink = fat_subdirs(inode)+2; | |
1176 | ||
1177 | return 0; | |
1178 | } | |
1179 | ||
1180 | /* | |
1181 | * Read the super block of an MS-DOS FS. | |
1182 | */ | |
1183 | int fat_fill_super(struct super_block *sb, void *data, int silent, | |
754661f1 | 1184 | const struct inode_operations *fs_dir_inode_ops, int isvfat) |
1da177e4 LT |
1185 | { |
1186 | struct inode *root_inode = NULL; | |
1187 | struct buffer_head *bh; | |
1188 | struct fat_boot_sector *b; | |
1189 | struct msdos_sb_info *sbi; | |
1190 | u16 logical_sector_size; | |
1191 | u32 total_sectors, total_clusters, fat_clusters, rootdir_sectors; | |
1192 | int debug; | |
1193 | unsigned int media; | |
1194 | long error; | |
1195 | char buf[50]; | |
1196 | ||
8f593427 LT |
1197 | /* |
1198 | * GFP_KERNEL is ok here, because while we do hold the | |
1199 | * supeblock lock, memory pressure can't call back into | |
1200 | * the filesystem, since we're only just about to mount | |
1201 | * it and have no inodes etc active! | |
1202 | */ | |
f8314dc6 | 1203 | sbi = kzalloc(sizeof(struct msdos_sb_info), GFP_KERNEL); |
1da177e4 LT |
1204 | if (!sbi) |
1205 | return -ENOMEM; | |
1206 | sb->s_fs_info = sbi; | |
1da177e4 LT |
1207 | |
1208 | sb->s_flags |= MS_NODIRATIME; | |
1209 | sb->s_magic = MSDOS_SUPER_MAGIC; | |
1210 | sb->s_op = &fat_sops; | |
1211 | sb->s_export_op = &fat_export_ops; | |
1212 | sbi->dir_ops = fs_dir_inode_ops; | |
1213 | ||
41a34a4f | 1214 | error = parse_options(data, isvfat, silent, &debug, &sbi->options); |
1da177e4 LT |
1215 | if (error) |
1216 | goto out_fail; | |
1217 | ||
1218 | error = -EIO; | |
1219 | sb_min_blocksize(sb, 512); | |
1220 | bh = sb_bread(sb, 0); | |
1221 | if (bh == NULL) { | |
1222 | printk(KERN_ERR "FAT: unable to read boot sector\n"); | |
1223 | goto out_fail; | |
1224 | } | |
1225 | ||
1226 | b = (struct fat_boot_sector *) bh->b_data; | |
1227 | if (!b->reserved) { | |
1228 | if (!silent) | |
1229 | printk(KERN_ERR "FAT: bogus number of reserved sectors\n"); | |
1230 | brelse(bh); | |
1231 | goto out_invalid; | |
1232 | } | |
1233 | if (!b->fats) { | |
1234 | if (!silent) | |
1235 | printk(KERN_ERR "FAT: bogus number of FAT structure\n"); | |
1236 | brelse(bh); | |
1237 | goto out_invalid; | |
1238 | } | |
1239 | ||
1240 | /* | |
1241 | * Earlier we checked here that b->secs_track and b->head are nonzero, | |
1242 | * but it turns out valid FAT filesystems can have zero there. | |
1243 | */ | |
1244 | ||
1245 | media = b->media; | |
73f20e58 | 1246 | if (!fat_valid_media(media)) { |
1da177e4 LT |
1247 | if (!silent) |
1248 | printk(KERN_ERR "FAT: invalid media value (0x%02x)\n", | |
1249 | media); | |
1250 | brelse(bh); | |
1251 | goto out_invalid; | |
1252 | } | |
803f445f | 1253 | logical_sector_size = get_unaligned_le16(&b->sector_size); |
e7d709c0 | 1254 | if (!is_power_of_2(logical_sector_size) |
1da177e4 | 1255 | || (logical_sector_size < 512) |
9f354858 | 1256 | || (logical_sector_size > 4096)) { |
1da177e4 LT |
1257 | if (!silent) |
1258 | printk(KERN_ERR "FAT: bogus logical sector size %u\n", | |
1259 | logical_sector_size); | |
1260 | brelse(bh); | |
1261 | goto out_invalid; | |
1262 | } | |
1263 | sbi->sec_per_clus = b->sec_per_clus; | |
e7d709c0 | 1264 | if (!is_power_of_2(sbi->sec_per_clus)) { |
1da177e4 LT |
1265 | if (!silent) |
1266 | printk(KERN_ERR "FAT: bogus sectors per cluster %u\n", | |
1267 | sbi->sec_per_clus); | |
1268 | brelse(bh); | |
1269 | goto out_invalid; | |
1270 | } | |
1271 | ||
1272 | if (logical_sector_size < sb->s_blocksize) { | |
1273 | printk(KERN_ERR "FAT: logical sector size too small for device" | |
1274 | " (logical sector size = %u)\n", logical_sector_size); | |
1275 | brelse(bh); | |
1276 | goto out_fail; | |
1277 | } | |
1278 | if (logical_sector_size > sb->s_blocksize) { | |
1279 | brelse(bh); | |
1280 | ||
1281 | if (!sb_set_blocksize(sb, logical_sector_size)) { | |
1282 | printk(KERN_ERR "FAT: unable to set blocksize %u\n", | |
1283 | logical_sector_size); | |
1284 | goto out_fail; | |
1285 | } | |
1286 | bh = sb_bread(sb, 0); | |
1287 | if (bh == NULL) { | |
1288 | printk(KERN_ERR "FAT: unable to read boot sector" | |
1289 | " (logical sector size = %lu)\n", | |
1290 | sb->s_blocksize); | |
1291 | goto out_fail; | |
1292 | } | |
1293 | b = (struct fat_boot_sector *) bh->b_data; | |
1294 | } | |
1295 | ||
1296 | sbi->cluster_size = sb->s_blocksize * sbi->sec_per_clus; | |
1297 | sbi->cluster_bits = ffs(sbi->cluster_size) - 1; | |
1298 | sbi->fats = b->fats; | |
1299 | sbi->fat_bits = 0; /* Don't know yet */ | |
1300 | sbi->fat_start = le16_to_cpu(b->reserved); | |
1301 | sbi->fat_length = le16_to_cpu(b->fat_length); | |
1302 | sbi->root_cluster = 0; | |
1303 | sbi->free_clusters = -1; /* Don't know yet */ | |
606e423e | 1304 | sbi->free_clus_valid = 0; |
1da177e4 LT |
1305 | sbi->prev_free = FAT_START_ENT; |
1306 | ||
1307 | if (!sbi->fat_length && b->fat32_length) { | |
1308 | struct fat_boot_fsinfo *fsinfo; | |
1309 | struct buffer_head *fsinfo_bh; | |
1310 | ||
1311 | /* Must be FAT32 */ | |
1312 | sbi->fat_bits = 32; | |
1313 | sbi->fat_length = le32_to_cpu(b->fat32_length); | |
1314 | sbi->root_cluster = le32_to_cpu(b->root_cluster); | |
1315 | ||
1316 | sb->s_maxbytes = 0xffffffff; | |
1317 | ||
1318 | /* MC - if info_sector is 0, don't multiply by 0 */ | |
1319 | sbi->fsinfo_sector = le16_to_cpu(b->info_sector); | |
1320 | if (sbi->fsinfo_sector == 0) | |
1321 | sbi->fsinfo_sector = 1; | |
1322 | ||
1323 | fsinfo_bh = sb_bread(sb, sbi->fsinfo_sector); | |
1324 | if (fsinfo_bh == NULL) { | |
1325 | printk(KERN_ERR "FAT: bread failed, FSINFO block" | |
1326 | " (sector = %lu)\n", sbi->fsinfo_sector); | |
1327 | brelse(bh); | |
1328 | goto out_fail; | |
1329 | } | |
1330 | ||
1331 | fsinfo = (struct fat_boot_fsinfo *)fsinfo_bh->b_data; | |
1332 | if (!IS_FSINFO(fsinfo)) { | |
b4cf9c34 VN |
1333 | printk(KERN_WARNING "FAT: Invalid FSINFO signature: " |
1334 | "0x%08x, 0x%08x (sector = %lu)\n", | |
1da177e4 LT |
1335 | le32_to_cpu(fsinfo->signature1), |
1336 | le32_to_cpu(fsinfo->signature2), | |
1337 | sbi->fsinfo_sector); | |
1338 | } else { | |
28ec039c | 1339 | if (sbi->options.usefree) |
606e423e OH |
1340 | sbi->free_clus_valid = 1; |
1341 | sbi->free_clusters = le32_to_cpu(fsinfo->free_clusters); | |
1da177e4 LT |
1342 | sbi->prev_free = le32_to_cpu(fsinfo->next_cluster); |
1343 | } | |
1344 | ||
1345 | brelse(fsinfo_bh); | |
1346 | } | |
1347 | ||
1348 | sbi->dir_per_block = sb->s_blocksize / sizeof(struct msdos_dir_entry); | |
1349 | sbi->dir_per_block_bits = ffs(sbi->dir_per_block) - 1; | |
1350 | ||
1351 | sbi->dir_start = sbi->fat_start + sbi->fats * sbi->fat_length; | |
803f445f | 1352 | sbi->dir_entries = get_unaligned_le16(&b->dir_entries); |
1da177e4 LT |
1353 | if (sbi->dir_entries & (sbi->dir_per_block - 1)) { |
1354 | if (!silent) | |
1355 | printk(KERN_ERR "FAT: bogus directroy-entries per block" | |
1356 | " (%u)\n", sbi->dir_entries); | |
1357 | brelse(bh); | |
1358 | goto out_invalid; | |
1359 | } | |
1360 | ||
1361 | rootdir_sectors = sbi->dir_entries | |
1362 | * sizeof(struct msdos_dir_entry) / sb->s_blocksize; | |
1363 | sbi->data_start = sbi->dir_start + rootdir_sectors; | |
803f445f | 1364 | total_sectors = get_unaligned_le16(&b->sectors); |
1da177e4 LT |
1365 | if (total_sectors == 0) |
1366 | total_sectors = le32_to_cpu(b->total_sect); | |
1367 | ||
1368 | total_clusters = (total_sectors - sbi->data_start) / sbi->sec_per_clus; | |
1369 | ||
1370 | if (sbi->fat_bits != 32) | |
1371 | sbi->fat_bits = (total_clusters > MAX_FAT12) ? 16 : 12; | |
1372 | ||
1373 | /* check that FAT table does not overflow */ | |
1374 | fat_clusters = sbi->fat_length * sb->s_blocksize * 8 / sbi->fat_bits; | |
1375 | total_clusters = min(total_clusters, fat_clusters - FAT_START_ENT); | |
1376 | if (total_clusters > MAX_FAT(sb)) { | |
1377 | if (!silent) | |
1378 | printk(KERN_ERR "FAT: count of clusters too big (%u)\n", | |
1379 | total_clusters); | |
1380 | brelse(bh); | |
1381 | goto out_invalid; | |
1382 | } | |
1383 | ||
1384 | sbi->max_cluster = total_clusters + FAT_START_ENT; | |
1385 | /* check the free_clusters, it's not necessarily correct */ | |
1386 | if (sbi->free_clusters != -1 && sbi->free_clusters > total_clusters) | |
1387 | sbi->free_clusters = -1; | |
1388 | /* check the prev_free, it's not necessarily correct */ | |
1389 | sbi->prev_free %= sbi->max_cluster; | |
1390 | if (sbi->prev_free < FAT_START_ENT) | |
1391 | sbi->prev_free = FAT_START_ENT; | |
1392 | ||
1393 | brelse(bh); | |
1394 | ||
1395 | /* set up enough so that it can read an inode */ | |
1396 | fat_hash_init(sb); | |
1397 | fat_ent_access_init(sb); | |
1398 | ||
1399 | /* | |
1400 | * The low byte of FAT's first entry must have same value with | |
1401 | * media-field. But in real world, too many devices is | |
1402 | * writing wrong value. So, removed that validity check. | |
1403 | * | |
1404 | * if (FAT_FIRST_ENT(sb, media) != first) | |
1405 | */ | |
1406 | ||
1407 | error = -EINVAL; | |
1408 | sprintf(buf, "cp%d", sbi->options.codepage); | |
1409 | sbi->nls_disk = load_nls(buf); | |
1410 | if (!sbi->nls_disk) { | |
1411 | printk(KERN_ERR "FAT: codepage %s not found\n", buf); | |
1412 | goto out_fail; | |
1413 | } | |
1414 | ||
1415 | /* FIXME: utf8 is using iocharset for upper/lower conversion */ | |
1416 | if (sbi->options.isvfat) { | |
1417 | sbi->nls_io = load_nls(sbi->options.iocharset); | |
1418 | if (!sbi->nls_io) { | |
1419 | printk(KERN_ERR "FAT: IO charset %s not found\n", | |
1420 | sbi->options.iocharset); | |
1421 | goto out_fail; | |
1422 | } | |
1423 | } | |
1424 | ||
1425 | error = -ENOMEM; | |
1426 | root_inode = new_inode(sb); | |
1427 | if (!root_inode) | |
1428 | goto out_fail; | |
1429 | root_inode->i_ino = MSDOS_ROOT_INO; | |
1430 | root_inode->i_version = 1; | |
1431 | error = fat_read_root(root_inode); | |
1432 | if (error < 0) | |
1433 | goto out_fail; | |
1434 | error = -ENOMEM; | |
1435 | insert_inode_hash(root_inode); | |
1436 | sb->s_root = d_alloc_root(root_inode); | |
1437 | if (!sb->s_root) { | |
1438 | printk(KERN_ERR "FAT: get root inode failed\n"); | |
1439 | goto out_fail; | |
1440 | } | |
1441 | ||
1442 | return 0; | |
1443 | ||
1444 | out_invalid: | |
1445 | error = -EINVAL; | |
1446 | if (!silent) | |
1447 | printk(KERN_INFO "VFS: Can't find a valid FAT filesystem" | |
1448 | " on dev %s.\n", sb->s_id); | |
1449 | ||
1450 | out_fail: | |
1451 | if (root_inode) | |
1452 | iput(root_inode); | |
1453 | if (sbi->nls_io) | |
1454 | unload_nls(sbi->nls_io); | |
1455 | if (sbi->nls_disk) | |
1456 | unload_nls(sbi->nls_disk); | |
1457 | if (sbi->options.iocharset != fat_default_iocharset) | |
1458 | kfree(sbi->options.iocharset); | |
1459 | sb->s_fs_info = NULL; | |
1460 | kfree(sbi); | |
1461 | return error; | |
1462 | } | |
1463 | ||
7c709d00 | 1464 | EXPORT_SYMBOL_GPL(fat_fill_super); |
1da177e4 | 1465 | |
ae78bf9c CM |
1466 | /* |
1467 | * helper function for fat_flush_inodes. This writes both the inode | |
1468 | * and the file data blocks, waiting for in flight data blocks before | |
1469 | * the start of the call. It does not wait for any io started | |
1470 | * during the call | |
1471 | */ | |
1472 | static int writeback_inode(struct inode *inode) | |
1473 | { | |
1474 | ||
1475 | int ret; | |
1476 | struct address_space *mapping = inode->i_mapping; | |
1477 | struct writeback_control wbc = { | |
1478 | .sync_mode = WB_SYNC_NONE, | |
1479 | .nr_to_write = 0, | |
1480 | }; | |
1481 | /* if we used WB_SYNC_ALL, sync_inode waits for the io for the | |
1482 | * inode to finish. So WB_SYNC_NONE is sent down to sync_inode | |
1483 | * and filemap_fdatawrite is used for the data blocks | |
1484 | */ | |
1485 | ret = sync_inode(inode, &wbc); | |
1486 | if (!ret) | |
1487 | ret = filemap_fdatawrite(mapping); | |
1488 | return ret; | |
1489 | } | |
1490 | ||
1491 | /* | |
1492 | * write data and metadata corresponding to i1 and i2. The io is | |
1493 | * started but we do not wait for any of it to finish. | |
1494 | * | |
1495 | * filemap_flush is used for the block device, so if there is a dirty | |
1496 | * page for a block already in flight, we will not wait and start the | |
1497 | * io over again | |
1498 | */ | |
1499 | int fat_flush_inodes(struct super_block *sb, struct inode *i1, struct inode *i2) | |
1500 | { | |
1501 | int ret = 0; | |
1502 | if (!MSDOS_SB(sb)->options.flush) | |
1503 | return 0; | |
1504 | if (i1) | |
1505 | ret = writeback_inode(i1); | |
1506 | if (!ret && i2) | |
1507 | ret = writeback_inode(i2); | |
97e860d3 | 1508 | if (!ret) { |
ae78bf9c CM |
1509 | struct address_space *mapping = sb->s_bdev->bd_inode->i_mapping; |
1510 | ret = filemap_flush(mapping); | |
1511 | } | |
1512 | return ret; | |
1513 | } | |
1514 | EXPORT_SYMBOL_GPL(fat_flush_inodes); | |
1515 | ||
1da177e4 LT |
1516 | static int __init init_fat_fs(void) |
1517 | { | |
532a39a3 | 1518 | int err; |
1da177e4 | 1519 | |
532a39a3 PE |
1520 | err = fat_cache_init(); |
1521 | if (err) | |
1522 | return err; | |
1523 | ||
1524 | err = fat_init_inodecache(); | |
1525 | if (err) | |
1526 | goto failed; | |
1527 | ||
1528 | return 0; | |
1529 | ||
1530 | failed: | |
1531 | fat_cache_destroy(); | |
1532 | return err; | |
1da177e4 LT |
1533 | } |
1534 | ||
1535 | static void __exit exit_fat_fs(void) | |
1536 | { | |
1537 | fat_cache_destroy(); | |
1538 | fat_destroy_inodecache(); | |
1539 | } | |
1540 | ||
1541 | module_init(init_fat_fs) | |
1542 | module_exit(exit_fat_fs) | |
1543 | ||
1544 | MODULE_LICENSE("GPL"); |