]>
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> | |
17 | #include <linux/smp_lock.h> | |
18 | #include <linux/seq_file.h> | |
19 | #include <linux/msdos_fs.h> | |
20 | #include <linux/pagemap.h> | |
a5425d29 | 21 | #include <linux/mpage.h> |
1da177e4 | 22 | #include <linux/buffer_head.h> |
a5694255 | 23 | #include <linux/exportfs.h> |
1da177e4 LT |
24 | #include <linux/mount.h> |
25 | #include <linux/vfs.h> | |
26 | #include <linux/parser.h> | |
e5174baa | 27 | #include <linux/uio.h> |
ae78bf9c | 28 | #include <linux/writeback.h> |
e7d709c0 | 29 | #include <linux/log2.h> |
1da177e4 LT |
30 | #include <asm/unaligned.h> |
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 | |
e5174baa | 66 | err = fat_bmap(inode, iblock, &phys, &mapped_blocks); |
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 LT |
77 | if (iblock != MSDOS_I(inode)->mmu_private >> sb->s_blocksize_bits) { |
78 | fat_fs_panic(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 | ||
96 | err = fat_bmap(inode, iblock, &phys, &mapped_blocks); | |
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 | ||
d7777a25 NP |
144 | static int fat_write_begin(struct file *file, struct address_space *mapping, |
145 | loff_t pos, unsigned len, unsigned flags, | |
146 | struct page **pagep, void **fsdata) | |
1da177e4 | 147 | { |
d7777a25 NP |
148 | *pagep = NULL; |
149 | return cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata, | |
150 | fat_get_block, | |
151 | &MSDOS_I(mapping->host)->mmu_private); | |
1da177e4 LT |
152 | } |
153 | ||
d7777a25 NP |
154 | static int fat_write_end(struct file *file, struct address_space *mapping, |
155 | loff_t pos, unsigned len, unsigned copied, | |
156 | struct page *pagep, void *fsdata) | |
ef402268 | 157 | { |
d7777a25 NP |
158 | struct inode *inode = mapping->host; |
159 | int err; | |
160 | err = generic_write_end(file, mapping, pos, len, copied, pagep, fsdata); | |
161 | if (!(err < 0) && !(MSDOS_I(inode)->i_attrs & ATTR_ARCH)) { | |
ef402268 OH |
162 | inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC; |
163 | MSDOS_I(inode)->i_attrs |= ATTR_ARCH; | |
164 | mark_inode_dirty(inode); | |
165 | } | |
166 | return err; | |
167 | } | |
168 | ||
e5174baa OH |
169 | static ssize_t fat_direct_IO(int rw, struct kiocb *iocb, |
170 | const struct iovec *iov, | |
171 | loff_t offset, unsigned long nr_segs) | |
172 | { | |
173 | struct file *file = iocb->ki_filp; | |
174 | struct inode *inode = file->f_mapping->host; | |
175 | ||
176 | if (rw == WRITE) { | |
177 | /* | |
178 | * FIXME: blockdev_direct_IO() doesn't use ->prepare_write(), | |
179 | * so we need to update the ->mmu_private to block boundary. | |
180 | * | |
181 | * But we must fill the remaining area or hole by nul for | |
182 | * updating ->mmu_private. | |
94412a96 OH |
183 | * |
184 | * Return 0, and fallback to normal buffered write. | |
e5174baa OH |
185 | */ |
186 | loff_t size = offset + iov_length(iov, nr_segs); | |
187 | if (MSDOS_I(inode)->mmu_private < size) | |
94412a96 | 188 | return 0; |
e5174baa OH |
189 | } |
190 | ||
191 | /* | |
192 | * FAT need to use the DIO_LOCKING for avoiding the race | |
193 | * condition of fat_get_block() and ->truncate(). | |
194 | */ | |
195 | return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov, | |
6a1d9805 | 196 | offset, nr_segs, fat_get_block, NULL); |
e5174baa OH |
197 | } |
198 | ||
1da177e4 LT |
199 | static sector_t _fat_bmap(struct address_space *mapping, sector_t block) |
200 | { | |
201 | return generic_block_bmap(mapping, block, fat_get_block); | |
202 | } | |
203 | ||
f5e54d6e | 204 | static const struct address_space_operations fat_aops = { |
1da177e4 | 205 | .readpage = fat_readpage, |
a5425d29 | 206 | .readpages = fat_readpages, |
1da177e4 | 207 | .writepage = fat_writepage, |
a5425d29 | 208 | .writepages = fat_writepages, |
1da177e4 | 209 | .sync_page = block_sync_page, |
d7777a25 NP |
210 | .write_begin = fat_write_begin, |
211 | .write_end = fat_write_end, | |
e5174baa | 212 | .direct_IO = fat_direct_IO, |
1da177e4 LT |
213 | .bmap = _fat_bmap |
214 | }; | |
215 | ||
216 | /* | |
217 | * New FAT inode stuff. We do the following: | |
218 | * a) i_ino is constant and has nothing with on-disk location. | |
219 | * b) FAT manages its own cache of directory entries. | |
220 | * c) *This* cache is indexed by on-disk location. | |
221 | * d) inode has an associated directory entry, all right, but | |
222 | * it may be unhashed. | |
223 | * e) currently entries are stored within struct inode. That should | |
224 | * change. | |
225 | * f) we deal with races in the following way: | |
226 | * 1. readdir() and lookup() do FAT-dir-cache lookup. | |
227 | * 2. rename() unhashes the F-d-c entry and rehashes it in | |
228 | * a new place. | |
229 | * 3. unlink() and rmdir() unhash F-d-c entry. | |
230 | * 4. fat_write_inode() checks whether the thing is unhashed. | |
231 | * If it is we silently return. If it isn't we do bread(), | |
232 | * check if the location is still valid and retry if it | |
233 | * isn't. Otherwise we do changes. | |
234 | * 5. Spinlock is used to protect hash/unhash/location check/lookup | |
235 | * 6. fat_clear_inode() unhashes the F-d-c entry. | |
236 | * 7. lookup() and readdir() do igrab() if they find a F-d-c entry | |
237 | * and consider negative result as cache miss. | |
238 | */ | |
239 | ||
240 | static void fat_hash_init(struct super_block *sb) | |
241 | { | |
242 | struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
243 | int i; | |
244 | ||
245 | spin_lock_init(&sbi->inode_hash_lock); | |
246 | for (i = 0; i < FAT_HASH_SIZE; i++) | |
247 | INIT_HLIST_HEAD(&sbi->inode_hashtable[i]); | |
248 | } | |
249 | ||
250 | static inline unsigned long fat_hash(struct super_block *sb, loff_t i_pos) | |
251 | { | |
252 | unsigned long tmp = (unsigned long)i_pos | (unsigned long) sb; | |
253 | tmp = tmp + (tmp >> FAT_HASH_BITS) + (tmp >> FAT_HASH_BITS * 2); | |
254 | return tmp & FAT_HASH_MASK; | |
255 | } | |
256 | ||
257 | void fat_attach(struct inode *inode, loff_t i_pos) | |
258 | { | |
259 | struct super_block *sb = inode->i_sb; | |
260 | struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
261 | ||
262 | spin_lock(&sbi->inode_hash_lock); | |
263 | MSDOS_I(inode)->i_pos = i_pos; | |
264 | hlist_add_head(&MSDOS_I(inode)->i_fat_hash, | |
265 | sbi->inode_hashtable + fat_hash(sb, i_pos)); | |
266 | spin_unlock(&sbi->inode_hash_lock); | |
267 | } | |
268 | ||
7c709d00 | 269 | EXPORT_SYMBOL_GPL(fat_attach); |
1da177e4 LT |
270 | |
271 | void fat_detach(struct inode *inode) | |
272 | { | |
273 | struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb); | |
274 | spin_lock(&sbi->inode_hash_lock); | |
275 | MSDOS_I(inode)->i_pos = 0; | |
276 | hlist_del_init(&MSDOS_I(inode)->i_fat_hash); | |
277 | spin_unlock(&sbi->inode_hash_lock); | |
278 | } | |
279 | ||
7c709d00 | 280 | EXPORT_SYMBOL_GPL(fat_detach); |
1da177e4 LT |
281 | |
282 | struct inode *fat_iget(struct super_block *sb, loff_t i_pos) | |
283 | { | |
284 | struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
285 | struct hlist_head *head = sbi->inode_hashtable + fat_hash(sb, i_pos); | |
286 | struct hlist_node *_p; | |
287 | struct msdos_inode_info *i; | |
288 | struct inode *inode = NULL; | |
289 | ||
290 | spin_lock(&sbi->inode_hash_lock); | |
291 | hlist_for_each_entry(i, _p, head, i_fat_hash) { | |
292 | BUG_ON(i->vfs_inode.i_sb != sb); | |
293 | if (i->i_pos != i_pos) | |
294 | continue; | |
295 | inode = igrab(&i->vfs_inode); | |
296 | if (inode) | |
297 | break; | |
298 | } | |
299 | spin_unlock(&sbi->inode_hash_lock); | |
300 | return inode; | |
301 | } | |
302 | ||
303 | static int is_exec(unsigned char *extension) | |
304 | { | |
305 | unsigned char *exe_extensions = "EXECOMBAT", *walk; | |
306 | ||
307 | for (walk = exe_extensions; *walk; walk += 3) | |
308 | if (!strncmp(extension, walk, 3)) | |
309 | return 1; | |
310 | return 0; | |
311 | } | |
312 | ||
313 | static int fat_calc_dir_size(struct inode *inode) | |
314 | { | |
315 | struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb); | |
316 | int ret, fclus, dclus; | |
317 | ||
318 | inode->i_size = 0; | |
319 | if (MSDOS_I(inode)->i_start == 0) | |
320 | return 0; | |
321 | ||
322 | ret = fat_get_cluster(inode, FAT_ENT_EOF, &fclus, &dclus); | |
323 | if (ret < 0) | |
324 | return ret; | |
325 | inode->i_size = (fclus + 1) << sbi->cluster_bits; | |
326 | ||
327 | return 0; | |
328 | } | |
329 | ||
330 | /* doesn't deal with root inode */ | |
331 | static int fat_fill_inode(struct inode *inode, struct msdos_dir_entry *de) | |
332 | { | |
333 | struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb); | |
334 | int error; | |
335 | ||
336 | MSDOS_I(inode)->i_pos = 0; | |
337 | inode->i_uid = sbi->options.fs_uid; | |
338 | inode->i_gid = sbi->options.fs_gid; | |
339 | inode->i_version++; | |
340 | inode->i_generation = get_seconds(); | |
341 | ||
342 | if ((de->attr & ATTR_DIR) && !IS_FREE(de->name)) { | |
343 | inode->i_generation &= ~1; | |
344 | inode->i_mode = MSDOS_MKMODE(de->attr, | |
345 | S_IRWXUGO & ~sbi->options.fs_dmask) | S_IFDIR; | |
346 | inode->i_op = sbi->dir_ops; | |
347 | inode->i_fop = &fat_dir_operations; | |
348 | ||
349 | MSDOS_I(inode)->i_start = le16_to_cpu(de->start); | |
350 | if (sbi->fat_bits == 32) | |
351 | MSDOS_I(inode)->i_start |= (le16_to_cpu(de->starthi) << 16); | |
352 | ||
353 | MSDOS_I(inode)->i_logstart = MSDOS_I(inode)->i_start; | |
354 | error = fat_calc_dir_size(inode); | |
355 | if (error < 0) | |
356 | return error; | |
357 | MSDOS_I(inode)->mmu_private = inode->i_size; | |
358 | ||
359 | inode->i_nlink = fat_subdirs(inode); | |
360 | } else { /* not a directory */ | |
361 | inode->i_generation |= 1; | |
362 | inode->i_mode = MSDOS_MKMODE(de->attr, | |
9aacd599 | 363 | ((sbi->options.showexec && !is_exec(de->name + 8)) |
1da177e4 LT |
364 | ? S_IRUGO|S_IWUGO : S_IRWXUGO) |
365 | & ~sbi->options.fs_fmask) | S_IFREG; | |
366 | MSDOS_I(inode)->i_start = le16_to_cpu(de->start); | |
367 | if (sbi->fat_bits == 32) | |
368 | MSDOS_I(inode)->i_start |= (le16_to_cpu(de->starthi) << 16); | |
369 | ||
370 | MSDOS_I(inode)->i_logstart = MSDOS_I(inode)->i_start; | |
371 | inode->i_size = le32_to_cpu(de->size); | |
372 | inode->i_op = &fat_file_inode_operations; | |
373 | inode->i_fop = &fat_file_operations; | |
374 | inode->i_mapping->a_ops = &fat_aops; | |
375 | MSDOS_I(inode)->mmu_private = inode->i_size; | |
376 | } | |
377 | if (de->attr & ATTR_SYS) { | |
378 | if (sbi->options.sys_immutable) | |
379 | inode->i_flags |= S_IMMUTABLE; | |
380 | } | |
381 | MSDOS_I(inode)->i_attrs = de->attr & ATTR_UNUSED; | |
1da177e4 LT |
382 | inode->i_blocks = ((inode->i_size + (sbi->cluster_size - 1)) |
383 | & ~((loff_t)sbi->cluster_size - 1)) >> 9; | |
62a36c43 | 384 | inode->i_mtime.tv_sec = |
b271e067 JP |
385 | date_dos2unix(le16_to_cpu(de->time), le16_to_cpu(de->date), |
386 | sbi->options.tz_utc); | |
62a36c43 | 387 | inode->i_mtime.tv_nsec = 0; |
1da177e4 LT |
388 | if (sbi->options.isvfat) { |
389 | int secs = de->ctime_cs / 100; | |
390 | int csecs = de->ctime_cs % 100; | |
391 | inode->i_ctime.tv_sec = | |
392 | date_dos2unix(le16_to_cpu(de->ctime), | |
b271e067 JP |
393 | le16_to_cpu(de->cdate), |
394 | sbi->options.tz_utc) + secs; | |
1da177e4 | 395 | inode->i_ctime.tv_nsec = csecs * 10000000; |
62a36c43 | 396 | inode->i_atime.tv_sec = |
b271e067 JP |
397 | date_dos2unix(0, le16_to_cpu(de->adate), |
398 | sbi->options.tz_utc); | |
62a36c43 | 399 | inode->i_atime.tv_nsec = 0; |
1da177e4 | 400 | } else |
62a36c43 | 401 | inode->i_ctime = inode->i_atime = inode->i_mtime; |
1da177e4 LT |
402 | |
403 | return 0; | |
404 | } | |
405 | ||
406 | struct inode *fat_build_inode(struct super_block *sb, | |
407 | struct msdos_dir_entry *de, loff_t i_pos) | |
408 | { | |
409 | struct inode *inode; | |
410 | int err; | |
411 | ||
412 | inode = fat_iget(sb, i_pos); | |
413 | if (inode) | |
414 | goto out; | |
415 | inode = new_inode(sb); | |
416 | if (!inode) { | |
417 | inode = ERR_PTR(-ENOMEM); | |
418 | goto out; | |
419 | } | |
420 | inode->i_ino = iunique(sb, MSDOS_ROOT_INO); | |
421 | inode->i_version = 1; | |
422 | err = fat_fill_inode(inode, de); | |
423 | if (err) { | |
424 | iput(inode); | |
425 | inode = ERR_PTR(err); | |
426 | goto out; | |
427 | } | |
428 | fat_attach(inode, i_pos); | |
429 | insert_inode_hash(inode); | |
430 | out: | |
431 | return inode; | |
432 | } | |
433 | ||
7c709d00 | 434 | EXPORT_SYMBOL_GPL(fat_build_inode); |
1da177e4 LT |
435 | |
436 | static void fat_delete_inode(struct inode *inode) | |
437 | { | |
fef26658 | 438 | truncate_inode_pages(&inode->i_data, 0); |
3754a544 OH |
439 | inode->i_size = 0; |
440 | fat_truncate(inode); | |
1da177e4 LT |
441 | clear_inode(inode); |
442 | } | |
443 | ||
444 | static void fat_clear_inode(struct inode *inode) | |
445 | { | |
8f593427 LT |
446 | struct super_block *sb = inode->i_sb; |
447 | struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
1da177e4 | 448 | |
1da177e4 LT |
449 | spin_lock(&sbi->inode_hash_lock); |
450 | fat_cache_inval_inode(inode); | |
451 | hlist_del_init(&MSDOS_I(inode)->i_fat_hash); | |
452 | spin_unlock(&sbi->inode_hash_lock); | |
1da177e4 LT |
453 | } |
454 | ||
a6bf6b21 | 455 | static void fat_write_super(struct super_block *sb) |
1da177e4 | 456 | { |
a6bf6b21 | 457 | sb->s_dirt = 0; |
1da177e4 LT |
458 | |
459 | if (!(sb->s_flags & MS_RDONLY)) | |
460 | fat_clusters_flush(sb); | |
a6bf6b21 OH |
461 | } |
462 | ||
463 | static void fat_put_super(struct super_block *sb) | |
464 | { | |
465 | struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
1da177e4 LT |
466 | |
467 | if (sbi->nls_disk) { | |
468 | unload_nls(sbi->nls_disk); | |
469 | sbi->nls_disk = NULL; | |
470 | sbi->options.codepage = fat_default_codepage; | |
471 | } | |
472 | if (sbi->nls_io) { | |
473 | unload_nls(sbi->nls_io); | |
474 | sbi->nls_io = NULL; | |
475 | } | |
476 | if (sbi->options.iocharset != fat_default_iocharset) { | |
477 | kfree(sbi->options.iocharset); | |
478 | sbi->options.iocharset = fat_default_iocharset; | |
479 | } | |
480 | ||
481 | sb->s_fs_info = NULL; | |
482 | kfree(sbi); | |
483 | } | |
484 | ||
e18b890b | 485 | static struct kmem_cache *fat_inode_cachep; |
1da177e4 LT |
486 | |
487 | static struct inode *fat_alloc_inode(struct super_block *sb) | |
488 | { | |
489 | struct msdos_inode_info *ei; | |
8f593427 | 490 | ei = kmem_cache_alloc(fat_inode_cachep, GFP_NOFS); |
1da177e4 LT |
491 | if (!ei) |
492 | return NULL; | |
493 | return &ei->vfs_inode; | |
494 | } | |
495 | ||
496 | static void fat_destroy_inode(struct inode *inode) | |
497 | { | |
498 | kmem_cache_free(fat_inode_cachep, MSDOS_I(inode)); | |
499 | } | |
500 | ||
51cc5068 | 501 | static void init_once(void *foo) |
1da177e4 LT |
502 | { |
503 | struct msdos_inode_info *ei = (struct msdos_inode_info *)foo; | |
504 | ||
a35afb83 CL |
505 | spin_lock_init(&ei->cache_lru_lock); |
506 | ei->nr_caches = 0; | |
507 | ei->cache_valid_id = FAT_CACHE_VALID + 1; | |
508 | INIT_LIST_HEAD(&ei->cache_lru); | |
509 | INIT_HLIST_NODE(&ei->i_fat_hash); | |
510 | inode_init_once(&ei->vfs_inode); | |
1da177e4 LT |
511 | } |
512 | ||
513 | static int __init fat_init_inodecache(void) | |
514 | { | |
515 | fat_inode_cachep = kmem_cache_create("fat_inode_cache", | |
516 | sizeof(struct msdos_inode_info), | |
fffb60f9 PJ |
517 | 0, (SLAB_RECLAIM_ACCOUNT| |
518 | SLAB_MEM_SPREAD), | |
20c2df83 | 519 | init_once); |
1da177e4 LT |
520 | if (fat_inode_cachep == NULL) |
521 | return -ENOMEM; | |
522 | return 0; | |
523 | } | |
524 | ||
525 | static void __exit fat_destroy_inodecache(void) | |
526 | { | |
1a1d92c1 | 527 | kmem_cache_destroy(fat_inode_cachep); |
1da177e4 LT |
528 | } |
529 | ||
530 | static int fat_remount(struct super_block *sb, int *flags, char *data) | |
531 | { | |
532 | struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
533 | *flags |= MS_NODIRATIME | (sbi->options.isvfat ? 0 : MS_NOATIME); | |
534 | return 0; | |
535 | } | |
536 | ||
726c3342 | 537 | static int fat_statfs(struct dentry *dentry, struct kstatfs *buf) |
1da177e4 | 538 | { |
726c3342 | 539 | struct msdos_sb_info *sbi = MSDOS_SB(dentry->d_sb); |
1da177e4 LT |
540 | |
541 | /* If the count of free cluster is still unknown, counts it here. */ | |
606e423e | 542 | if (sbi->free_clusters == -1 || !sbi->free_clus_valid) { |
726c3342 | 543 | int err = fat_count_free_clusters(dentry->d_sb); |
1da177e4 LT |
544 | if (err) |
545 | return err; | |
546 | } | |
547 | ||
726c3342 | 548 | buf->f_type = dentry->d_sb->s_magic; |
1da177e4 LT |
549 | buf->f_bsize = sbi->cluster_size; |
550 | buf->f_blocks = sbi->max_cluster - FAT_START_ENT; | |
551 | buf->f_bfree = sbi->free_clusters; | |
552 | buf->f_bavail = sbi->free_clusters; | |
553 | buf->f_namelen = sbi->options.isvfat ? 260 : 12; | |
554 | ||
555 | return 0; | |
556 | } | |
557 | ||
558 | static int fat_write_inode(struct inode *inode, int wait) | |
559 | { | |
560 | struct super_block *sb = inode->i_sb; | |
561 | struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
562 | struct buffer_head *bh; | |
563 | struct msdos_dir_entry *raw_entry; | |
564 | loff_t i_pos; | |
565 | int err = 0; | |
566 | ||
567 | retry: | |
568 | i_pos = MSDOS_I(inode)->i_pos; | |
569 | if (inode->i_ino == MSDOS_ROOT_INO || !i_pos) | |
570 | return 0; | |
571 | ||
8f593427 | 572 | lock_super(sb); |
1da177e4 LT |
573 | bh = sb_bread(sb, i_pos >> sbi->dir_per_block_bits); |
574 | if (!bh) { | |
575 | printk(KERN_ERR "FAT: unable to read inode block " | |
576 | "for updating (i_pos %lld)\n", i_pos); | |
577 | err = -EIO; | |
578 | goto out; | |
579 | } | |
580 | spin_lock(&sbi->inode_hash_lock); | |
581 | if (i_pos != MSDOS_I(inode)->i_pos) { | |
582 | spin_unlock(&sbi->inode_hash_lock); | |
583 | brelse(bh); | |
8f593427 | 584 | unlock_super(sb); |
1da177e4 LT |
585 | goto retry; |
586 | } | |
587 | ||
588 | raw_entry = &((struct msdos_dir_entry *) (bh->b_data)) | |
589 | [i_pos & (sbi->dir_per_block - 1)]; | |
590 | if (S_ISDIR(inode->i_mode)) | |
591 | raw_entry->size = 0; | |
592 | else | |
593 | raw_entry->size = cpu_to_le32(inode->i_size); | |
594 | raw_entry->attr = fat_attr(inode); | |
595 | raw_entry->start = cpu_to_le16(MSDOS_I(inode)->i_logstart); | |
596 | raw_entry->starthi = cpu_to_le16(MSDOS_I(inode)->i_logstart >> 16); | |
b271e067 JP |
597 | fat_date_unix2dos(inode->i_mtime.tv_sec, &raw_entry->time, |
598 | &raw_entry->date, sbi->options.tz_utc); | |
1da177e4 | 599 | if (sbi->options.isvfat) { |
62a36c43 | 600 | __le16 atime; |
b271e067 JP |
601 | fat_date_unix2dos(inode->i_ctime.tv_sec, &raw_entry->ctime, |
602 | &raw_entry->cdate, sbi->options.tz_utc); | |
603 | fat_date_unix2dos(inode->i_atime.tv_sec, &atime, | |
604 | &raw_entry->adate, sbi->options.tz_utc); | |
1da177e4 LT |
605 | raw_entry->ctime_cs = (inode->i_ctime.tv_sec & 1) * 100 + |
606 | inode->i_ctime.tv_nsec / 10000000; | |
607 | } | |
608 | spin_unlock(&sbi->inode_hash_lock); | |
609 | mark_buffer_dirty(bh); | |
610 | if (wait) | |
611 | err = sync_dirty_buffer(bh); | |
612 | brelse(bh); | |
613 | out: | |
8f593427 | 614 | unlock_super(sb); |
1da177e4 LT |
615 | return err; |
616 | } | |
617 | ||
618 | int fat_sync_inode(struct inode *inode) | |
619 | { | |
620 | return fat_write_inode(inode, 1); | |
621 | } | |
622 | ||
7c709d00 | 623 | EXPORT_SYMBOL_GPL(fat_sync_inode); |
1da177e4 LT |
624 | |
625 | static int fat_show_options(struct seq_file *m, struct vfsmount *mnt); | |
ee9b6d61 | 626 | static const struct super_operations fat_sops = { |
1da177e4 LT |
627 | .alloc_inode = fat_alloc_inode, |
628 | .destroy_inode = fat_destroy_inode, | |
629 | .write_inode = fat_write_inode, | |
630 | .delete_inode = fat_delete_inode, | |
631 | .put_super = fat_put_super, | |
a6bf6b21 | 632 | .write_super = fat_write_super, |
1da177e4 LT |
633 | .statfs = fat_statfs, |
634 | .clear_inode = fat_clear_inode, | |
635 | .remount_fs = fat_remount, | |
636 | ||
1da177e4 LT |
637 | .show_options = fat_show_options, |
638 | }; | |
639 | ||
640 | /* | |
641 | * a FAT file handle with fhtype 3 is | |
642 | * 0/ i_ino - for fast, reliable lookup if still in the cache | |
643 | * 1/ i_generation - to see if i_ino is still valid | |
644 | * bit 0 == 0 iff directory | |
645 | * 2/ i_pos(8-39) - if ino has changed, but still in cache | |
646 | * 3/ i_pos(4-7)|i_logstart - to semi-verify inode found at i_pos | |
647 | * 4/ i_pos(0-3)|parent->i_logstart - maybe used to hunt for the file on disc | |
648 | * | |
649 | * Hack for NFSv2: Maximum FAT entry number is 28bits and maximum | |
650 | * i_pos is 40bits (blocknr(32) + dir offset(8)), so two 4bits | |
651 | * of i_logstart is used to store the directory entry offset. | |
652 | */ | |
653 | ||
1305edad CH |
654 | static struct dentry *fat_fh_to_dentry(struct super_block *sb, |
655 | struct fid *fid, int fh_len, int fh_type) | |
1da177e4 LT |
656 | { |
657 | struct inode *inode = NULL; | |
658 | struct dentry *result; | |
1305edad CH |
659 | u32 *fh = fid->raw; |
660 | ||
661 | if (fh_len < 5 || fh_type != 3) | |
662 | return NULL; | |
1da177e4 | 663 | |
17f95a7b DH |
664 | inode = ilookup(sb, fh[0]); |
665 | if (!inode || inode->i_generation != fh[1]) { | |
1da177e4 LT |
666 | if (inode) |
667 | iput(inode); | |
668 | inode = NULL; | |
669 | } | |
670 | if (!inode) { | |
671 | loff_t i_pos; | |
672 | int i_logstart = fh[3] & 0x0fffffff; | |
673 | ||
674 | i_pos = (loff_t)fh[2] << 8; | |
675 | i_pos |= ((fh[3] >> 24) & 0xf0) | (fh[4] >> 28); | |
676 | ||
677 | /* try 2 - see if i_pos is in F-d-c | |
678 | * require i_logstart to be the same | |
679 | * Will fail if you truncate and then re-write | |
680 | */ | |
681 | ||
682 | inode = fat_iget(sb, i_pos); | |
683 | if (inode && MSDOS_I(inode)->i_logstart != i_logstart) { | |
684 | iput(inode); | |
685 | inode = NULL; | |
686 | } | |
687 | } | |
688 | if (!inode) { | |
689 | /* For now, do nothing | |
690 | * What we could do is: | |
691 | * follow the file starting at fh[4], and record | |
692 | * the ".." entry, and the name of the fh[2] entry. | |
693 | * The follow the ".." file finding the next step up. | |
694 | * This way we build a path to the root of | |
695 | * the tree. If this works, we lookup the path and so | |
696 | * get this inode into the cache. | |
697 | * Finally try the fat_iget lookup again | |
698 | * If that fails, then weare totally out of luck | |
699 | * But all that is for another day | |
700 | */ | |
701 | } | |
702 | if (!inode) | |
703 | return ERR_PTR(-ESTALE); | |
704 | ||
705 | ||
706 | /* now to find a dentry. | |
707 | * If possible, get a well-connected one | |
708 | */ | |
709 | result = d_alloc_anon(inode); | |
710 | if (result == NULL) { | |
711 | iput(inode); | |
712 | return ERR_PTR(-ENOMEM); | |
713 | } | |
714 | result->d_op = sb->s_root->d_op; | |
715 | return result; | |
716 | } | |
717 | ||
718 | static int | |
719 | fat_encode_fh(struct dentry *de, __u32 *fh, int *lenp, int connectable) | |
720 | { | |
721 | int len = *lenp; | |
722 | struct inode *inode = de->d_inode; | |
723 | u32 ipos_h, ipos_m, ipos_l; | |
724 | ||
725 | if (len < 5) | |
726 | return 255; /* no room */ | |
727 | ||
728 | ipos_h = MSDOS_I(inode)->i_pos >> 8; | |
729 | ipos_m = (MSDOS_I(inode)->i_pos & 0xf0) << 24; | |
730 | ipos_l = (MSDOS_I(inode)->i_pos & 0x0f) << 28; | |
731 | *lenp = 5; | |
732 | fh[0] = inode->i_ino; | |
733 | fh[1] = inode->i_generation; | |
734 | fh[2] = ipos_h; | |
735 | fh[3] = ipos_m | MSDOS_I(inode)->i_logstart; | |
736 | spin_lock(&de->d_lock); | |
737 | fh[4] = ipos_l | MSDOS_I(de->d_parent->d_inode)->i_logstart; | |
738 | spin_unlock(&de->d_lock); | |
739 | return 3; | |
740 | } | |
741 | ||
742 | static struct dentry *fat_get_parent(struct dentry *child) | |
743 | { | |
8f593427 | 744 | struct super_block *sb = child->d_sb; |
1da177e4 LT |
745 | struct buffer_head *bh; |
746 | struct msdos_dir_entry *de; | |
747 | loff_t i_pos; | |
748 | struct dentry *parent; | |
749 | struct inode *inode; | |
750 | int err; | |
751 | ||
8f593427 | 752 | lock_super(sb); |
1da177e4 LT |
753 | |
754 | err = fat_get_dotdot_entry(child->d_inode, &bh, &de, &i_pos); | |
755 | if (err) { | |
756 | parent = ERR_PTR(err); | |
757 | goto out; | |
758 | } | |
8f593427 | 759 | inode = fat_build_inode(sb, de, i_pos); |
1da177e4 LT |
760 | brelse(bh); |
761 | if (IS_ERR(inode)) { | |
e231c2ee | 762 | parent = ERR_CAST(inode); |
1da177e4 LT |
763 | goto out; |
764 | } | |
765 | parent = d_alloc_anon(inode); | |
766 | if (!parent) { | |
767 | iput(inode); | |
768 | parent = ERR_PTR(-ENOMEM); | |
769 | } | |
770 | out: | |
8f593427 | 771 | unlock_super(sb); |
1da177e4 LT |
772 | |
773 | return parent; | |
774 | } | |
775 | ||
39655164 | 776 | static const struct export_operations fat_export_ops = { |
1da177e4 | 777 | .encode_fh = fat_encode_fh, |
1305edad | 778 | .fh_to_dentry = fat_fh_to_dentry, |
1da177e4 LT |
779 | .get_parent = fat_get_parent, |
780 | }; | |
781 | ||
782 | static int fat_show_options(struct seq_file *m, struct vfsmount *mnt) | |
783 | { | |
784 | struct msdos_sb_info *sbi = MSDOS_SB(mnt->mnt_sb); | |
785 | struct fat_mount_options *opts = &sbi->options; | |
786 | int isvfat = opts->isvfat; | |
787 | ||
788 | if (opts->fs_uid != 0) | |
789 | seq_printf(m, ",uid=%u", opts->fs_uid); | |
790 | if (opts->fs_gid != 0) | |
791 | seq_printf(m, ",gid=%u", opts->fs_gid); | |
792 | seq_printf(m, ",fmask=%04o", opts->fs_fmask); | |
793 | seq_printf(m, ",dmask=%04o", opts->fs_dmask); | |
1ae43f82 OH |
794 | if (opts->allow_utime) |
795 | seq_printf(m, ",allow_utime=%04o", opts->allow_utime); | |
1da177e4 LT |
796 | if (sbi->nls_disk) |
797 | seq_printf(m, ",codepage=%s", sbi->nls_disk->charset); | |
798 | if (isvfat) { | |
799 | if (sbi->nls_io) | |
800 | seq_printf(m, ",iocharset=%s", sbi->nls_io->charset); | |
801 | ||
802 | switch (opts->shortname) { | |
803 | case VFAT_SFN_DISPLAY_WIN95 | VFAT_SFN_CREATE_WIN95: | |
804 | seq_puts(m, ",shortname=win95"); | |
805 | break; | |
806 | case VFAT_SFN_DISPLAY_WINNT | VFAT_SFN_CREATE_WINNT: | |
807 | seq_puts(m, ",shortname=winnt"); | |
808 | break; | |
809 | case VFAT_SFN_DISPLAY_WINNT | VFAT_SFN_CREATE_WIN95: | |
810 | seq_puts(m, ",shortname=mixed"); | |
811 | break; | |
812 | case VFAT_SFN_DISPLAY_LOWER | VFAT_SFN_CREATE_WIN95: | |
813 | /* seq_puts(m, ",shortname=lower"); */ | |
814 | break; | |
815 | default: | |
816 | seq_puts(m, ",shortname=unknown"); | |
817 | break; | |
818 | } | |
819 | } | |
820 | if (opts->name_check != 'n') | |
821 | seq_printf(m, ",check=%c", opts->name_check); | |
28ec039c OH |
822 | if (opts->usefree) |
823 | seq_puts(m, ",usefree"); | |
1da177e4 LT |
824 | if (opts->quiet) |
825 | seq_puts(m, ",quiet"); | |
826 | if (opts->showexec) | |
827 | seq_puts(m, ",showexec"); | |
828 | if (opts->sys_immutable) | |
829 | seq_puts(m, ",sys_immutable"); | |
830 | if (!isvfat) { | |
831 | if (opts->dotsOK) | |
832 | seq_puts(m, ",dotsOK=yes"); | |
833 | if (opts->nocase) | |
834 | seq_puts(m, ",nocase"); | |
835 | } else { | |
836 | if (opts->utf8) | |
837 | seq_puts(m, ",utf8"); | |
838 | if (opts->unicode_xlate) | |
839 | seq_puts(m, ",uni_xlate"); | |
840 | if (!opts->numtail) | |
841 | seq_puts(m, ",nonumtail"); | |
842 | } | |
c1fca3b6 MS |
843 | if (sbi->options.flush) |
844 | seq_puts(m, ",flush"); | |
b271e067 JP |
845 | if (opts->tz_utc) |
846 | seq_puts(m, ",tz=UTC"); | |
1da177e4 LT |
847 | |
848 | return 0; | |
849 | } | |
850 | ||
851 | enum { | |
852 | Opt_check_n, Opt_check_r, Opt_check_s, Opt_uid, Opt_gid, | |
1ae43f82 OH |
853 | Opt_umask, Opt_dmask, Opt_fmask, Opt_allow_utime, Opt_codepage, |
854 | Opt_usefree, Opt_nocase, Opt_quiet, Opt_showexec, Opt_debug, | |
855 | Opt_immutable, Opt_dots, Opt_nodots, | |
1da177e4 LT |
856 | Opt_charset, Opt_shortname_lower, Opt_shortname_win95, |
857 | Opt_shortname_winnt, Opt_shortname_mixed, Opt_utf8_no, Opt_utf8_yes, | |
858 | Opt_uni_xl_no, Opt_uni_xl_yes, Opt_nonumtail_no, Opt_nonumtail_yes, | |
b271e067 | 859 | Opt_obsolate, Opt_flush, Opt_tz_utc, Opt_err, |
1da177e4 LT |
860 | }; |
861 | ||
862 | static match_table_t fat_tokens = { | |
863 | {Opt_check_r, "check=relaxed"}, | |
864 | {Opt_check_s, "check=strict"}, | |
865 | {Opt_check_n, "check=normal"}, | |
866 | {Opt_check_r, "check=r"}, | |
867 | {Opt_check_s, "check=s"}, | |
868 | {Opt_check_n, "check=n"}, | |
869 | {Opt_uid, "uid=%u"}, | |
870 | {Opt_gid, "gid=%u"}, | |
871 | {Opt_umask, "umask=%o"}, | |
872 | {Opt_dmask, "dmask=%o"}, | |
873 | {Opt_fmask, "fmask=%o"}, | |
1ae43f82 | 874 | {Opt_allow_utime, "allow_utime=%o"}, |
1da177e4 | 875 | {Opt_codepage, "codepage=%u"}, |
28ec039c | 876 | {Opt_usefree, "usefree"}, |
1da177e4 LT |
877 | {Opt_nocase, "nocase"}, |
878 | {Opt_quiet, "quiet"}, | |
879 | {Opt_showexec, "showexec"}, | |
880 | {Opt_debug, "debug"}, | |
881 | {Opt_immutable, "sys_immutable"}, | |
882 | {Opt_obsolate, "conv=binary"}, | |
883 | {Opt_obsolate, "conv=text"}, | |
884 | {Opt_obsolate, "conv=auto"}, | |
885 | {Opt_obsolate, "conv=b"}, | |
886 | {Opt_obsolate, "conv=t"}, | |
887 | {Opt_obsolate, "conv=a"}, | |
888 | {Opt_obsolate, "fat=%u"}, | |
889 | {Opt_obsolate, "blocksize=%u"}, | |
890 | {Opt_obsolate, "cvf_format=%20s"}, | |
891 | {Opt_obsolate, "cvf_options=%100s"}, | |
892 | {Opt_obsolate, "posix"}, | |
ae78bf9c | 893 | {Opt_flush, "flush"}, |
b271e067 | 894 | {Opt_tz_utc, "tz=UTC"}, |
ae78bf9c | 895 | {Opt_err, NULL}, |
1da177e4 LT |
896 | }; |
897 | static match_table_t msdos_tokens = { | |
898 | {Opt_nodots, "nodots"}, | |
899 | {Opt_nodots, "dotsOK=no"}, | |
900 | {Opt_dots, "dots"}, | |
901 | {Opt_dots, "dotsOK=yes"}, | |
902 | {Opt_err, NULL} | |
903 | }; | |
904 | static match_table_t vfat_tokens = { | |
905 | {Opt_charset, "iocharset=%s"}, | |
906 | {Opt_shortname_lower, "shortname=lower"}, | |
907 | {Opt_shortname_win95, "shortname=win95"}, | |
908 | {Opt_shortname_winnt, "shortname=winnt"}, | |
909 | {Opt_shortname_mixed, "shortname=mixed"}, | |
910 | {Opt_utf8_no, "utf8=0"}, /* 0 or no or false */ | |
911 | {Opt_utf8_no, "utf8=no"}, | |
912 | {Opt_utf8_no, "utf8=false"}, | |
913 | {Opt_utf8_yes, "utf8=1"}, /* empty or 1 or yes or true */ | |
914 | {Opt_utf8_yes, "utf8=yes"}, | |
915 | {Opt_utf8_yes, "utf8=true"}, | |
916 | {Opt_utf8_yes, "utf8"}, | |
917 | {Opt_uni_xl_no, "uni_xlate=0"}, /* 0 or no or false */ | |
918 | {Opt_uni_xl_no, "uni_xlate=no"}, | |
919 | {Opt_uni_xl_no, "uni_xlate=false"}, | |
920 | {Opt_uni_xl_yes, "uni_xlate=1"}, /* empty or 1 or yes or true */ | |
921 | {Opt_uni_xl_yes, "uni_xlate=yes"}, | |
922 | {Opt_uni_xl_yes, "uni_xlate=true"}, | |
923 | {Opt_uni_xl_yes, "uni_xlate"}, | |
924 | {Opt_nonumtail_no, "nonumtail=0"}, /* 0 or no or false */ | |
925 | {Opt_nonumtail_no, "nonumtail=no"}, | |
926 | {Opt_nonumtail_no, "nonumtail=false"}, | |
927 | {Opt_nonumtail_yes, "nonumtail=1"}, /* empty or 1 or yes or true */ | |
928 | {Opt_nonumtail_yes, "nonumtail=yes"}, | |
929 | {Opt_nonumtail_yes, "nonumtail=true"}, | |
930 | {Opt_nonumtail_yes, "nonumtail"}, | |
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 | ||
944 | opts->fs_uid = current->uid; | |
945 | opts->fs_gid = current->gid; | |
946 | opts->fs_fmask = opts->fs_dmask = current->fs->umask; | |
1ae43f82 | 947 | opts->allow_utime = -1; |
1da177e4 LT |
948 | opts->codepage = fat_default_codepage; |
949 | opts->iocharset = fat_default_iocharset; | |
950 | if (is_vfat) | |
951 | opts->shortname = VFAT_SFN_DISPLAY_LOWER|VFAT_SFN_CREATE_WIN95; | |
952 | else | |
953 | opts->shortname = 0; | |
954 | opts->name_check = 'n'; | |
955 | opts->quiet = opts->showexec = opts->sys_immutable = opts->dotsOK = 0; | |
956 | opts->utf8 = opts->unicode_xlate = 0; | |
957 | opts->numtail = 1; | |
28ec039c | 958 | opts->usefree = opts->nocase = 0; |
b271e067 | 959 | opts->tz_utc = 0; |
1da177e4 LT |
960 | *debug = 0; |
961 | ||
962 | if (!options) | |
8d44d974 | 963 | goto out; |
1da177e4 LT |
964 | |
965 | while ((p = strsep(&options, ",")) != NULL) { | |
966 | int token; | |
967 | if (!*p) | |
968 | continue; | |
969 | ||
970 | token = match_token(p, fat_tokens, args); | |
971 | if (token == Opt_err) { | |
972 | if (is_vfat) | |
973 | token = match_token(p, vfat_tokens, args); | |
974 | else | |
975 | token = match_token(p, msdos_tokens, args); | |
976 | } | |
977 | switch (token) { | |
978 | case Opt_check_s: | |
979 | opts->name_check = 's'; | |
980 | break; | |
981 | case Opt_check_r: | |
982 | opts->name_check = 'r'; | |
983 | break; | |
984 | case Opt_check_n: | |
985 | opts->name_check = 'n'; | |
986 | break; | |
28ec039c OH |
987 | case Opt_usefree: |
988 | opts->usefree = 1; | |
989 | break; | |
1da177e4 LT |
990 | case Opt_nocase: |
991 | if (!is_vfat) | |
992 | opts->nocase = 1; | |
993 | else { | |
994 | /* for backward compatibility */ | |
995 | opts->shortname = VFAT_SFN_DISPLAY_WIN95 | |
996 | | VFAT_SFN_CREATE_WIN95; | |
997 | } | |
998 | break; | |
999 | case Opt_quiet: | |
1000 | opts->quiet = 1; | |
1001 | break; | |
1002 | case Opt_showexec: | |
1003 | opts->showexec = 1; | |
1004 | break; | |
1005 | case Opt_debug: | |
1006 | *debug = 1; | |
1007 | break; | |
1008 | case Opt_immutable: | |
1009 | opts->sys_immutable = 1; | |
1010 | break; | |
1011 | case Opt_uid: | |
1012 | if (match_int(&args[0], &option)) | |
1013 | return 0; | |
1014 | opts->fs_uid = option; | |
1015 | break; | |
1016 | case Opt_gid: | |
1017 | if (match_int(&args[0], &option)) | |
1018 | return 0; | |
1019 | opts->fs_gid = option; | |
1020 | break; | |
1021 | case Opt_umask: | |
1022 | if (match_octal(&args[0], &option)) | |
1023 | return 0; | |
1024 | opts->fs_fmask = opts->fs_dmask = option; | |
1025 | break; | |
1026 | case Opt_dmask: | |
1027 | if (match_octal(&args[0], &option)) | |
1028 | return 0; | |
1029 | opts->fs_dmask = option; | |
1030 | break; | |
1031 | case Opt_fmask: | |
1032 | if (match_octal(&args[0], &option)) | |
1033 | return 0; | |
1034 | opts->fs_fmask = option; | |
1035 | break; | |
1ae43f82 OH |
1036 | case Opt_allow_utime: |
1037 | if (match_octal(&args[0], &option)) | |
1038 | return 0; | |
1039 | opts->allow_utime = option & (S_IWGRP | S_IWOTH); | |
1040 | break; | |
1da177e4 LT |
1041 | case Opt_codepage: |
1042 | if (match_int(&args[0], &option)) | |
1043 | return 0; | |
1044 | opts->codepage = option; | |
1045 | break; | |
ae78bf9c CM |
1046 | case Opt_flush: |
1047 | opts->flush = 1; | |
1048 | break; | |
b271e067 JP |
1049 | case Opt_tz_utc: |
1050 | opts->tz_utc = 1; | |
1051 | break; | |
1da177e4 LT |
1052 | |
1053 | /* msdos specific */ | |
1054 | case Opt_dots: | |
1055 | opts->dotsOK = 1; | |
1056 | break; | |
1057 | case Opt_nodots: | |
1058 | opts->dotsOK = 0; | |
1059 | break; | |
1060 | ||
1061 | /* vfat specific */ | |
1062 | case Opt_charset: | |
1063 | if (opts->iocharset != fat_default_iocharset) | |
1064 | kfree(opts->iocharset); | |
1065 | iocharset = match_strdup(&args[0]); | |
1066 | if (!iocharset) | |
1067 | return -ENOMEM; | |
1068 | opts->iocharset = iocharset; | |
1069 | break; | |
1070 | case Opt_shortname_lower: | |
1071 | opts->shortname = VFAT_SFN_DISPLAY_LOWER | |
1072 | | VFAT_SFN_CREATE_WIN95; | |
1073 | break; | |
1074 | case Opt_shortname_win95: | |
1075 | opts->shortname = VFAT_SFN_DISPLAY_WIN95 | |
1076 | | VFAT_SFN_CREATE_WIN95; | |
1077 | break; | |
1078 | case Opt_shortname_winnt: | |
1079 | opts->shortname = VFAT_SFN_DISPLAY_WINNT | |
1080 | | VFAT_SFN_CREATE_WINNT; | |
1081 | break; | |
1082 | case Opt_shortname_mixed: | |
1083 | opts->shortname = VFAT_SFN_DISPLAY_WINNT | |
1084 | | VFAT_SFN_CREATE_WIN95; | |
1085 | break; | |
1086 | case Opt_utf8_no: /* 0 or no or false */ | |
1087 | opts->utf8 = 0; | |
1088 | break; | |
1089 | case Opt_utf8_yes: /* empty or 1 or yes or true */ | |
1090 | opts->utf8 = 1; | |
1091 | break; | |
1092 | case Opt_uni_xl_no: /* 0 or no or false */ | |
1093 | opts->unicode_xlate = 0; | |
1094 | break; | |
1095 | case Opt_uni_xl_yes: /* empty or 1 or yes or true */ | |
1096 | opts->unicode_xlate = 1; | |
1097 | break; | |
1098 | case Opt_nonumtail_no: /* 0 or no or false */ | |
1099 | opts->numtail = 1; /* negated option */ | |
1100 | break; | |
1101 | case Opt_nonumtail_yes: /* empty or 1 or yes or true */ | |
1102 | opts->numtail = 0; /* negated option */ | |
1103 | break; | |
1104 | ||
1105 | /* obsolete mount options */ | |
1106 | case Opt_obsolate: | |
1107 | printk(KERN_INFO "FAT: \"%s\" option is obsolete, " | |
1108 | "not supported now\n", p); | |
1109 | break; | |
1110 | /* unknown option */ | |
1111 | default: | |
41a34a4f CH |
1112 | if (!silent) { |
1113 | printk(KERN_ERR | |
1114 | "FAT: Unrecognized mount option \"%s\" " | |
1115 | "or missing value\n", p); | |
1116 | } | |
1da177e4 LT |
1117 | return -EINVAL; |
1118 | } | |
1119 | } | |
8d44d974 OH |
1120 | |
1121 | out: | |
4de151d8 | 1122 | /* UTF-8 doesn't provide FAT semantics */ |
1da177e4 LT |
1123 | if (!strcmp(opts->iocharset, "utf8")) { |
1124 | printk(KERN_ERR "FAT: utf8 is not a recommended IO charset" | |
8d44d974 OH |
1125 | " for FAT filesystems, filesystem will be " |
1126 | "case sensitive!\n"); | |
1da177e4 LT |
1127 | } |
1128 | ||
1ae43f82 OH |
1129 | /* If user doesn't specify allow_utime, it's initialized from dmask. */ |
1130 | if (opts->allow_utime == (unsigned short)-1) | |
1131 | opts->allow_utime = ~opts->fs_dmask & (S_IWGRP | S_IWOTH); | |
1da177e4 LT |
1132 | if (opts->unicode_xlate) |
1133 | opts->utf8 = 0; | |
1134 | ||
1135 | return 0; | |
1136 | } | |
1137 | ||
1138 | static int fat_read_root(struct inode *inode) | |
1139 | { | |
1140 | struct super_block *sb = inode->i_sb; | |
1141 | struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
1142 | int error; | |
1143 | ||
1144 | MSDOS_I(inode)->i_pos = 0; | |
1145 | inode->i_uid = sbi->options.fs_uid; | |
1146 | inode->i_gid = sbi->options.fs_gid; | |
1147 | inode->i_version++; | |
1148 | inode->i_generation = 0; | |
1149 | inode->i_mode = (S_IRWXUGO & ~sbi->options.fs_dmask) | S_IFDIR; | |
1150 | inode->i_op = sbi->dir_ops; | |
1151 | inode->i_fop = &fat_dir_operations; | |
1152 | if (sbi->fat_bits == 32) { | |
1153 | MSDOS_I(inode)->i_start = sbi->root_cluster; | |
1154 | error = fat_calc_dir_size(inode); | |
1155 | if (error < 0) | |
1156 | return error; | |
1157 | } else { | |
1158 | MSDOS_I(inode)->i_start = 0; | |
1159 | inode->i_size = sbi->dir_entries * sizeof(struct msdos_dir_entry); | |
1160 | } | |
1da177e4 LT |
1161 | inode->i_blocks = ((inode->i_size + (sbi->cluster_size - 1)) |
1162 | & ~((loff_t)sbi->cluster_size - 1)) >> 9; | |
1163 | MSDOS_I(inode)->i_logstart = 0; | |
1164 | MSDOS_I(inode)->mmu_private = inode->i_size; | |
1165 | ||
1166 | MSDOS_I(inode)->i_attrs = ATTR_NONE; | |
1167 | inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = 0; | |
1168 | inode->i_mtime.tv_nsec = inode->i_atime.tv_nsec = inode->i_ctime.tv_nsec = 0; | |
1169 | inode->i_nlink = fat_subdirs(inode)+2; | |
1170 | ||
1171 | return 0; | |
1172 | } | |
1173 | ||
1174 | /* | |
1175 | * Read the super block of an MS-DOS FS. | |
1176 | */ | |
1177 | int fat_fill_super(struct super_block *sb, void *data, int silent, | |
754661f1 | 1178 | const struct inode_operations *fs_dir_inode_ops, int isvfat) |
1da177e4 LT |
1179 | { |
1180 | struct inode *root_inode = NULL; | |
1181 | struct buffer_head *bh; | |
1182 | struct fat_boot_sector *b; | |
1183 | struct msdos_sb_info *sbi; | |
1184 | u16 logical_sector_size; | |
1185 | u32 total_sectors, total_clusters, fat_clusters, rootdir_sectors; | |
1186 | int debug; | |
1187 | unsigned int media; | |
1188 | long error; | |
1189 | char buf[50]; | |
1190 | ||
8f593427 LT |
1191 | /* |
1192 | * GFP_KERNEL is ok here, because while we do hold the | |
1193 | * supeblock lock, memory pressure can't call back into | |
1194 | * the filesystem, since we're only just about to mount | |
1195 | * it and have no inodes etc active! | |
1196 | */ | |
f8314dc6 | 1197 | sbi = kzalloc(sizeof(struct msdos_sb_info), GFP_KERNEL); |
1da177e4 LT |
1198 | if (!sbi) |
1199 | return -ENOMEM; | |
1200 | sb->s_fs_info = sbi; | |
1da177e4 LT |
1201 | |
1202 | sb->s_flags |= MS_NODIRATIME; | |
1203 | sb->s_magic = MSDOS_SUPER_MAGIC; | |
1204 | sb->s_op = &fat_sops; | |
1205 | sb->s_export_op = &fat_export_ops; | |
1206 | sbi->dir_ops = fs_dir_inode_ops; | |
1207 | ||
41a34a4f | 1208 | error = parse_options(data, isvfat, silent, &debug, &sbi->options); |
1da177e4 LT |
1209 | if (error) |
1210 | goto out_fail; | |
1211 | ||
1212 | error = -EIO; | |
1213 | sb_min_blocksize(sb, 512); | |
1214 | bh = sb_bread(sb, 0); | |
1215 | if (bh == NULL) { | |
1216 | printk(KERN_ERR "FAT: unable to read boot sector\n"); | |
1217 | goto out_fail; | |
1218 | } | |
1219 | ||
1220 | b = (struct fat_boot_sector *) bh->b_data; | |
1221 | if (!b->reserved) { | |
1222 | if (!silent) | |
1223 | printk(KERN_ERR "FAT: bogus number of reserved sectors\n"); | |
1224 | brelse(bh); | |
1225 | goto out_invalid; | |
1226 | } | |
1227 | if (!b->fats) { | |
1228 | if (!silent) | |
1229 | printk(KERN_ERR "FAT: bogus number of FAT structure\n"); | |
1230 | brelse(bh); | |
1231 | goto out_invalid; | |
1232 | } | |
1233 | ||
1234 | /* | |
1235 | * Earlier we checked here that b->secs_track and b->head are nonzero, | |
1236 | * but it turns out valid FAT filesystems can have zero there. | |
1237 | */ | |
1238 | ||
1239 | media = b->media; | |
73f20e58 | 1240 | if (!fat_valid_media(media)) { |
1da177e4 LT |
1241 | if (!silent) |
1242 | printk(KERN_ERR "FAT: invalid media value (0x%02x)\n", | |
1243 | media); | |
1244 | brelse(bh); | |
1245 | goto out_invalid; | |
1246 | } | |
803f445f | 1247 | logical_sector_size = get_unaligned_le16(&b->sector_size); |
e7d709c0 | 1248 | if (!is_power_of_2(logical_sector_size) |
1da177e4 | 1249 | || (logical_sector_size < 512) |
9f354858 | 1250 | || (logical_sector_size > 4096)) { |
1da177e4 LT |
1251 | if (!silent) |
1252 | printk(KERN_ERR "FAT: bogus logical sector size %u\n", | |
1253 | logical_sector_size); | |
1254 | brelse(bh); | |
1255 | goto out_invalid; | |
1256 | } | |
1257 | sbi->sec_per_clus = b->sec_per_clus; | |
e7d709c0 | 1258 | if (!is_power_of_2(sbi->sec_per_clus)) { |
1da177e4 LT |
1259 | if (!silent) |
1260 | printk(KERN_ERR "FAT: bogus sectors per cluster %u\n", | |
1261 | sbi->sec_per_clus); | |
1262 | brelse(bh); | |
1263 | goto out_invalid; | |
1264 | } | |
1265 | ||
1266 | if (logical_sector_size < sb->s_blocksize) { | |
1267 | printk(KERN_ERR "FAT: logical sector size too small for device" | |
1268 | " (logical sector size = %u)\n", logical_sector_size); | |
1269 | brelse(bh); | |
1270 | goto out_fail; | |
1271 | } | |
1272 | if (logical_sector_size > sb->s_blocksize) { | |
1273 | brelse(bh); | |
1274 | ||
1275 | if (!sb_set_blocksize(sb, logical_sector_size)) { | |
1276 | printk(KERN_ERR "FAT: unable to set blocksize %u\n", | |
1277 | logical_sector_size); | |
1278 | goto out_fail; | |
1279 | } | |
1280 | bh = sb_bread(sb, 0); | |
1281 | if (bh == NULL) { | |
1282 | printk(KERN_ERR "FAT: unable to read boot sector" | |
1283 | " (logical sector size = %lu)\n", | |
1284 | sb->s_blocksize); | |
1285 | goto out_fail; | |
1286 | } | |
1287 | b = (struct fat_boot_sector *) bh->b_data; | |
1288 | } | |
1289 | ||
1290 | sbi->cluster_size = sb->s_blocksize * sbi->sec_per_clus; | |
1291 | sbi->cluster_bits = ffs(sbi->cluster_size) - 1; | |
1292 | sbi->fats = b->fats; | |
1293 | sbi->fat_bits = 0; /* Don't know yet */ | |
1294 | sbi->fat_start = le16_to_cpu(b->reserved); | |
1295 | sbi->fat_length = le16_to_cpu(b->fat_length); | |
1296 | sbi->root_cluster = 0; | |
1297 | sbi->free_clusters = -1; /* Don't know yet */ | |
606e423e | 1298 | sbi->free_clus_valid = 0; |
1da177e4 LT |
1299 | sbi->prev_free = FAT_START_ENT; |
1300 | ||
1301 | if (!sbi->fat_length && b->fat32_length) { | |
1302 | struct fat_boot_fsinfo *fsinfo; | |
1303 | struct buffer_head *fsinfo_bh; | |
1304 | ||
1305 | /* Must be FAT32 */ | |
1306 | sbi->fat_bits = 32; | |
1307 | sbi->fat_length = le32_to_cpu(b->fat32_length); | |
1308 | sbi->root_cluster = le32_to_cpu(b->root_cluster); | |
1309 | ||
1310 | sb->s_maxbytes = 0xffffffff; | |
1311 | ||
1312 | /* MC - if info_sector is 0, don't multiply by 0 */ | |
1313 | sbi->fsinfo_sector = le16_to_cpu(b->info_sector); | |
1314 | if (sbi->fsinfo_sector == 0) | |
1315 | sbi->fsinfo_sector = 1; | |
1316 | ||
1317 | fsinfo_bh = sb_bread(sb, sbi->fsinfo_sector); | |
1318 | if (fsinfo_bh == NULL) { | |
1319 | printk(KERN_ERR "FAT: bread failed, FSINFO block" | |
1320 | " (sector = %lu)\n", sbi->fsinfo_sector); | |
1321 | brelse(bh); | |
1322 | goto out_fail; | |
1323 | } | |
1324 | ||
1325 | fsinfo = (struct fat_boot_fsinfo *)fsinfo_bh->b_data; | |
1326 | if (!IS_FSINFO(fsinfo)) { | |
b4cf9c34 VN |
1327 | printk(KERN_WARNING "FAT: Invalid FSINFO signature: " |
1328 | "0x%08x, 0x%08x (sector = %lu)\n", | |
1da177e4 LT |
1329 | le32_to_cpu(fsinfo->signature1), |
1330 | le32_to_cpu(fsinfo->signature2), | |
1331 | sbi->fsinfo_sector); | |
1332 | } else { | |
28ec039c | 1333 | if (sbi->options.usefree) |
606e423e OH |
1334 | sbi->free_clus_valid = 1; |
1335 | sbi->free_clusters = le32_to_cpu(fsinfo->free_clusters); | |
1da177e4 LT |
1336 | sbi->prev_free = le32_to_cpu(fsinfo->next_cluster); |
1337 | } | |
1338 | ||
1339 | brelse(fsinfo_bh); | |
1340 | } | |
1341 | ||
1342 | sbi->dir_per_block = sb->s_blocksize / sizeof(struct msdos_dir_entry); | |
1343 | sbi->dir_per_block_bits = ffs(sbi->dir_per_block) - 1; | |
1344 | ||
1345 | sbi->dir_start = sbi->fat_start + sbi->fats * sbi->fat_length; | |
803f445f | 1346 | sbi->dir_entries = get_unaligned_le16(&b->dir_entries); |
1da177e4 LT |
1347 | if (sbi->dir_entries & (sbi->dir_per_block - 1)) { |
1348 | if (!silent) | |
1349 | printk(KERN_ERR "FAT: bogus directroy-entries per block" | |
1350 | " (%u)\n", sbi->dir_entries); | |
1351 | brelse(bh); | |
1352 | goto out_invalid; | |
1353 | } | |
1354 | ||
1355 | rootdir_sectors = sbi->dir_entries | |
1356 | * sizeof(struct msdos_dir_entry) / sb->s_blocksize; | |
1357 | sbi->data_start = sbi->dir_start + rootdir_sectors; | |
803f445f | 1358 | total_sectors = get_unaligned_le16(&b->sectors); |
1da177e4 LT |
1359 | if (total_sectors == 0) |
1360 | total_sectors = le32_to_cpu(b->total_sect); | |
1361 | ||
1362 | total_clusters = (total_sectors - sbi->data_start) / sbi->sec_per_clus; | |
1363 | ||
1364 | if (sbi->fat_bits != 32) | |
1365 | sbi->fat_bits = (total_clusters > MAX_FAT12) ? 16 : 12; | |
1366 | ||
1367 | /* check that FAT table does not overflow */ | |
1368 | fat_clusters = sbi->fat_length * sb->s_blocksize * 8 / sbi->fat_bits; | |
1369 | total_clusters = min(total_clusters, fat_clusters - FAT_START_ENT); | |
1370 | if (total_clusters > MAX_FAT(sb)) { | |
1371 | if (!silent) | |
1372 | printk(KERN_ERR "FAT: count of clusters too big (%u)\n", | |
1373 | total_clusters); | |
1374 | brelse(bh); | |
1375 | goto out_invalid; | |
1376 | } | |
1377 | ||
1378 | sbi->max_cluster = total_clusters + FAT_START_ENT; | |
1379 | /* check the free_clusters, it's not necessarily correct */ | |
1380 | if (sbi->free_clusters != -1 && sbi->free_clusters > total_clusters) | |
1381 | sbi->free_clusters = -1; | |
1382 | /* check the prev_free, it's not necessarily correct */ | |
1383 | sbi->prev_free %= sbi->max_cluster; | |
1384 | if (sbi->prev_free < FAT_START_ENT) | |
1385 | sbi->prev_free = FAT_START_ENT; | |
1386 | ||
1387 | brelse(bh); | |
1388 | ||
1389 | /* set up enough so that it can read an inode */ | |
1390 | fat_hash_init(sb); | |
1391 | fat_ent_access_init(sb); | |
1392 | ||
1393 | /* | |
1394 | * The low byte of FAT's first entry must have same value with | |
1395 | * media-field. But in real world, too many devices is | |
1396 | * writing wrong value. So, removed that validity check. | |
1397 | * | |
1398 | * if (FAT_FIRST_ENT(sb, media) != first) | |
1399 | */ | |
1400 | ||
1401 | error = -EINVAL; | |
1402 | sprintf(buf, "cp%d", sbi->options.codepage); | |
1403 | sbi->nls_disk = load_nls(buf); | |
1404 | if (!sbi->nls_disk) { | |
1405 | printk(KERN_ERR "FAT: codepage %s not found\n", buf); | |
1406 | goto out_fail; | |
1407 | } | |
1408 | ||
1409 | /* FIXME: utf8 is using iocharset for upper/lower conversion */ | |
1410 | if (sbi->options.isvfat) { | |
1411 | sbi->nls_io = load_nls(sbi->options.iocharset); | |
1412 | if (!sbi->nls_io) { | |
1413 | printk(KERN_ERR "FAT: IO charset %s not found\n", | |
1414 | sbi->options.iocharset); | |
1415 | goto out_fail; | |
1416 | } | |
1417 | } | |
1418 | ||
1419 | error = -ENOMEM; | |
1420 | root_inode = new_inode(sb); | |
1421 | if (!root_inode) | |
1422 | goto out_fail; | |
1423 | root_inode->i_ino = MSDOS_ROOT_INO; | |
1424 | root_inode->i_version = 1; | |
1425 | error = fat_read_root(root_inode); | |
1426 | if (error < 0) | |
1427 | goto out_fail; | |
1428 | error = -ENOMEM; | |
1429 | insert_inode_hash(root_inode); | |
1430 | sb->s_root = d_alloc_root(root_inode); | |
1431 | if (!sb->s_root) { | |
1432 | printk(KERN_ERR "FAT: get root inode failed\n"); | |
1433 | goto out_fail; | |
1434 | } | |
1435 | ||
1436 | return 0; | |
1437 | ||
1438 | out_invalid: | |
1439 | error = -EINVAL; | |
1440 | if (!silent) | |
1441 | printk(KERN_INFO "VFS: Can't find a valid FAT filesystem" | |
1442 | " on dev %s.\n", sb->s_id); | |
1443 | ||
1444 | out_fail: | |
1445 | if (root_inode) | |
1446 | iput(root_inode); | |
1447 | if (sbi->nls_io) | |
1448 | unload_nls(sbi->nls_io); | |
1449 | if (sbi->nls_disk) | |
1450 | unload_nls(sbi->nls_disk); | |
1451 | if (sbi->options.iocharset != fat_default_iocharset) | |
1452 | kfree(sbi->options.iocharset); | |
1453 | sb->s_fs_info = NULL; | |
1454 | kfree(sbi); | |
1455 | return error; | |
1456 | } | |
1457 | ||
7c709d00 | 1458 | EXPORT_SYMBOL_GPL(fat_fill_super); |
1da177e4 | 1459 | |
ae78bf9c CM |
1460 | /* |
1461 | * helper function for fat_flush_inodes. This writes both the inode | |
1462 | * and the file data blocks, waiting for in flight data blocks before | |
1463 | * the start of the call. It does not wait for any io started | |
1464 | * during the call | |
1465 | */ | |
1466 | static int writeback_inode(struct inode *inode) | |
1467 | { | |
1468 | ||
1469 | int ret; | |
1470 | struct address_space *mapping = inode->i_mapping; | |
1471 | struct writeback_control wbc = { | |
1472 | .sync_mode = WB_SYNC_NONE, | |
1473 | .nr_to_write = 0, | |
1474 | }; | |
1475 | /* if we used WB_SYNC_ALL, sync_inode waits for the io for the | |
1476 | * inode to finish. So WB_SYNC_NONE is sent down to sync_inode | |
1477 | * and filemap_fdatawrite is used for the data blocks | |
1478 | */ | |
1479 | ret = sync_inode(inode, &wbc); | |
1480 | if (!ret) | |
1481 | ret = filemap_fdatawrite(mapping); | |
1482 | return ret; | |
1483 | } | |
1484 | ||
1485 | /* | |
1486 | * write data and metadata corresponding to i1 and i2. The io is | |
1487 | * started but we do not wait for any of it to finish. | |
1488 | * | |
1489 | * filemap_flush is used for the block device, so if there is a dirty | |
1490 | * page for a block already in flight, we will not wait and start the | |
1491 | * io over again | |
1492 | */ | |
1493 | int fat_flush_inodes(struct super_block *sb, struct inode *i1, struct inode *i2) | |
1494 | { | |
1495 | int ret = 0; | |
1496 | if (!MSDOS_SB(sb)->options.flush) | |
1497 | return 0; | |
1498 | if (i1) | |
1499 | ret = writeback_inode(i1); | |
1500 | if (!ret && i2) | |
1501 | ret = writeback_inode(i2); | |
97e860d3 | 1502 | if (!ret) { |
ae78bf9c CM |
1503 | struct address_space *mapping = sb->s_bdev->bd_inode->i_mapping; |
1504 | ret = filemap_flush(mapping); | |
1505 | } | |
1506 | return ret; | |
1507 | } | |
1508 | EXPORT_SYMBOL_GPL(fat_flush_inodes); | |
1509 | ||
1da177e4 LT |
1510 | static int __init init_fat_fs(void) |
1511 | { | |
532a39a3 | 1512 | int err; |
1da177e4 | 1513 | |
532a39a3 PE |
1514 | err = fat_cache_init(); |
1515 | if (err) | |
1516 | return err; | |
1517 | ||
1518 | err = fat_init_inodecache(); | |
1519 | if (err) | |
1520 | goto failed; | |
1521 | ||
1522 | return 0; | |
1523 | ||
1524 | failed: | |
1525 | fat_cache_destroy(); | |
1526 | return err; | |
1da177e4 LT |
1527 | } |
1528 | ||
1529 | static void __exit exit_fat_fs(void) | |
1530 | { | |
1531 | fat_cache_destroy(); | |
1532 | fat_destroy_inodecache(); | |
1533 | } | |
1534 | ||
1535 | module_init(init_fat_fs) | |
1536 | module_exit(exit_fat_fs) | |
1537 | ||
1538 | MODULE_LICENSE("GPL"); |