]>
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 = |
1da177e4 | 385 | date_dos2unix(le16_to_cpu(de->time), le16_to_cpu(de->date)); |
62a36c43 | 386 | inode->i_mtime.tv_nsec = 0; |
1da177e4 LT |
387 | if (sbi->options.isvfat) { |
388 | int secs = de->ctime_cs / 100; | |
389 | int csecs = de->ctime_cs % 100; | |
390 | inode->i_ctime.tv_sec = | |
391 | date_dos2unix(le16_to_cpu(de->ctime), | |
392 | le16_to_cpu(de->cdate)) + secs; | |
393 | inode->i_ctime.tv_nsec = csecs * 10000000; | |
62a36c43 | 394 | inode->i_atime.tv_sec = |
31b1f85b | 395 | date_dos2unix(0, le16_to_cpu(de->adate)); |
62a36c43 | 396 | inode->i_atime.tv_nsec = 0; |
1da177e4 | 397 | } else |
62a36c43 | 398 | inode->i_ctime = inode->i_atime = inode->i_mtime; |
1da177e4 LT |
399 | |
400 | return 0; | |
401 | } | |
402 | ||
403 | struct inode *fat_build_inode(struct super_block *sb, | |
404 | struct msdos_dir_entry *de, loff_t i_pos) | |
405 | { | |
406 | struct inode *inode; | |
407 | int err; | |
408 | ||
409 | inode = fat_iget(sb, i_pos); | |
410 | if (inode) | |
411 | goto out; | |
412 | inode = new_inode(sb); | |
413 | if (!inode) { | |
414 | inode = ERR_PTR(-ENOMEM); | |
415 | goto out; | |
416 | } | |
417 | inode->i_ino = iunique(sb, MSDOS_ROOT_INO); | |
418 | inode->i_version = 1; | |
419 | err = fat_fill_inode(inode, de); | |
420 | if (err) { | |
421 | iput(inode); | |
422 | inode = ERR_PTR(err); | |
423 | goto out; | |
424 | } | |
425 | fat_attach(inode, i_pos); | |
426 | insert_inode_hash(inode); | |
427 | out: | |
428 | return inode; | |
429 | } | |
430 | ||
7c709d00 | 431 | EXPORT_SYMBOL_GPL(fat_build_inode); |
1da177e4 LT |
432 | |
433 | static void fat_delete_inode(struct inode *inode) | |
434 | { | |
fef26658 MF |
435 | truncate_inode_pages(&inode->i_data, 0); |
436 | ||
1da177e4 LT |
437 | if (!is_bad_inode(inode)) { |
438 | inode->i_size = 0; | |
439 | fat_truncate(inode); | |
440 | } | |
441 | clear_inode(inode); | |
442 | } | |
443 | ||
444 | static void fat_clear_inode(struct inode *inode) | |
445 | { | |
446 | struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb); | |
447 | ||
448 | if (is_bad_inode(inode)) | |
449 | return; | |
450 | lock_kernel(); | |
451 | spin_lock(&sbi->inode_hash_lock); | |
452 | fat_cache_inval_inode(inode); | |
453 | hlist_del_init(&MSDOS_I(inode)->i_fat_hash); | |
454 | spin_unlock(&sbi->inode_hash_lock); | |
455 | unlock_kernel(); | |
456 | } | |
457 | ||
a6bf6b21 | 458 | static void fat_write_super(struct super_block *sb) |
1da177e4 | 459 | { |
a6bf6b21 | 460 | sb->s_dirt = 0; |
1da177e4 LT |
461 | |
462 | if (!(sb->s_flags & MS_RDONLY)) | |
463 | fat_clusters_flush(sb); | |
a6bf6b21 OH |
464 | } |
465 | ||
466 | static void fat_put_super(struct super_block *sb) | |
467 | { | |
468 | struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
1da177e4 LT |
469 | |
470 | if (sbi->nls_disk) { | |
471 | unload_nls(sbi->nls_disk); | |
472 | sbi->nls_disk = NULL; | |
473 | sbi->options.codepage = fat_default_codepage; | |
474 | } | |
475 | if (sbi->nls_io) { | |
476 | unload_nls(sbi->nls_io); | |
477 | sbi->nls_io = NULL; | |
478 | } | |
479 | if (sbi->options.iocharset != fat_default_iocharset) { | |
480 | kfree(sbi->options.iocharset); | |
481 | sbi->options.iocharset = fat_default_iocharset; | |
482 | } | |
483 | ||
484 | sb->s_fs_info = NULL; | |
485 | kfree(sbi); | |
486 | } | |
487 | ||
e18b890b | 488 | static struct kmem_cache *fat_inode_cachep; |
1da177e4 LT |
489 | |
490 | static struct inode *fat_alloc_inode(struct super_block *sb) | |
491 | { | |
492 | struct msdos_inode_info *ei; | |
e94b1766 | 493 | ei = kmem_cache_alloc(fat_inode_cachep, GFP_KERNEL); |
1da177e4 LT |
494 | if (!ei) |
495 | return NULL; | |
496 | return &ei->vfs_inode; | |
497 | } | |
498 | ||
499 | static void fat_destroy_inode(struct inode *inode) | |
500 | { | |
501 | kmem_cache_free(fat_inode_cachep, MSDOS_I(inode)); | |
502 | } | |
503 | ||
4ba9b9d0 | 504 | static void init_once(struct kmem_cache *cachep, void *foo) |
1da177e4 LT |
505 | { |
506 | struct msdos_inode_info *ei = (struct msdos_inode_info *)foo; | |
507 | ||
a35afb83 CL |
508 | spin_lock_init(&ei->cache_lru_lock); |
509 | ei->nr_caches = 0; | |
510 | ei->cache_valid_id = FAT_CACHE_VALID + 1; | |
511 | INIT_LIST_HEAD(&ei->cache_lru); | |
512 | INIT_HLIST_NODE(&ei->i_fat_hash); | |
513 | inode_init_once(&ei->vfs_inode); | |
1da177e4 LT |
514 | } |
515 | ||
516 | static int __init fat_init_inodecache(void) | |
517 | { | |
518 | fat_inode_cachep = kmem_cache_create("fat_inode_cache", | |
519 | sizeof(struct msdos_inode_info), | |
fffb60f9 PJ |
520 | 0, (SLAB_RECLAIM_ACCOUNT| |
521 | SLAB_MEM_SPREAD), | |
20c2df83 | 522 | init_once); |
1da177e4 LT |
523 | if (fat_inode_cachep == NULL) |
524 | return -ENOMEM; | |
525 | return 0; | |
526 | } | |
527 | ||
528 | static void __exit fat_destroy_inodecache(void) | |
529 | { | |
1a1d92c1 | 530 | kmem_cache_destroy(fat_inode_cachep); |
1da177e4 LT |
531 | } |
532 | ||
533 | static int fat_remount(struct super_block *sb, int *flags, char *data) | |
534 | { | |
535 | struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
536 | *flags |= MS_NODIRATIME | (sbi->options.isvfat ? 0 : MS_NOATIME); | |
537 | return 0; | |
538 | } | |
539 | ||
726c3342 | 540 | static int fat_statfs(struct dentry *dentry, struct kstatfs *buf) |
1da177e4 | 541 | { |
726c3342 | 542 | struct msdos_sb_info *sbi = MSDOS_SB(dentry->d_sb); |
1da177e4 LT |
543 | |
544 | /* If the count of free cluster is still unknown, counts it here. */ | |
545 | if (sbi->free_clusters == -1) { | |
726c3342 | 546 | int err = fat_count_free_clusters(dentry->d_sb); |
1da177e4 LT |
547 | if (err) |
548 | return err; | |
549 | } | |
550 | ||
726c3342 | 551 | buf->f_type = dentry->d_sb->s_magic; |
1da177e4 LT |
552 | buf->f_bsize = sbi->cluster_size; |
553 | buf->f_blocks = sbi->max_cluster - FAT_START_ENT; | |
554 | buf->f_bfree = sbi->free_clusters; | |
555 | buf->f_bavail = sbi->free_clusters; | |
556 | buf->f_namelen = sbi->options.isvfat ? 260 : 12; | |
557 | ||
558 | return 0; | |
559 | } | |
560 | ||
561 | static int fat_write_inode(struct inode *inode, int wait) | |
562 | { | |
563 | struct super_block *sb = inode->i_sb; | |
564 | struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
565 | struct buffer_head *bh; | |
566 | struct msdos_dir_entry *raw_entry; | |
567 | loff_t i_pos; | |
568 | int err = 0; | |
569 | ||
570 | retry: | |
571 | i_pos = MSDOS_I(inode)->i_pos; | |
572 | if (inode->i_ino == MSDOS_ROOT_INO || !i_pos) | |
573 | return 0; | |
574 | ||
575 | lock_kernel(); | |
576 | bh = sb_bread(sb, i_pos >> sbi->dir_per_block_bits); | |
577 | if (!bh) { | |
578 | printk(KERN_ERR "FAT: unable to read inode block " | |
579 | "for updating (i_pos %lld)\n", i_pos); | |
580 | err = -EIO; | |
581 | goto out; | |
582 | } | |
583 | spin_lock(&sbi->inode_hash_lock); | |
584 | if (i_pos != MSDOS_I(inode)->i_pos) { | |
585 | spin_unlock(&sbi->inode_hash_lock); | |
586 | brelse(bh); | |
587 | unlock_kernel(); | |
588 | goto retry; | |
589 | } | |
590 | ||
591 | raw_entry = &((struct msdos_dir_entry *) (bh->b_data)) | |
592 | [i_pos & (sbi->dir_per_block - 1)]; | |
593 | if (S_ISDIR(inode->i_mode)) | |
594 | raw_entry->size = 0; | |
595 | else | |
596 | raw_entry->size = cpu_to_le32(inode->i_size); | |
597 | raw_entry->attr = fat_attr(inode); | |
598 | raw_entry->start = cpu_to_le16(MSDOS_I(inode)->i_logstart); | |
599 | raw_entry->starthi = cpu_to_le16(MSDOS_I(inode)->i_logstart >> 16); | |
600 | fat_date_unix2dos(inode->i_mtime.tv_sec, &raw_entry->time, &raw_entry->date); | |
601 | if (sbi->options.isvfat) { | |
62a36c43 | 602 | __le16 atime; |
1da177e4 | 603 | fat_date_unix2dos(inode->i_ctime.tv_sec,&raw_entry->ctime,&raw_entry->cdate); |
62a36c43 | 604 | fat_date_unix2dos(inode->i_atime.tv_sec,&atime,&raw_entry->adate); |
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: | |
614 | unlock_kernel(); | |
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 | ||
637 | .read_inode = make_bad_inode, | |
638 | ||
639 | .show_options = fat_show_options, | |
640 | }; | |
641 | ||
642 | /* | |
643 | * a FAT file handle with fhtype 3 is | |
644 | * 0/ i_ino - for fast, reliable lookup if still in the cache | |
645 | * 1/ i_generation - to see if i_ino is still valid | |
646 | * bit 0 == 0 iff directory | |
647 | * 2/ i_pos(8-39) - if ino has changed, but still in cache | |
648 | * 3/ i_pos(4-7)|i_logstart - to semi-verify inode found at i_pos | |
649 | * 4/ i_pos(0-3)|parent->i_logstart - maybe used to hunt for the file on disc | |
650 | * | |
651 | * Hack for NFSv2: Maximum FAT entry number is 28bits and maximum | |
652 | * i_pos is 40bits (blocknr(32) + dir offset(8)), so two 4bits | |
653 | * of i_logstart is used to store the directory entry offset. | |
654 | */ | |
655 | ||
1305edad CH |
656 | static struct dentry *fat_fh_to_dentry(struct super_block *sb, |
657 | struct fid *fid, int fh_len, int fh_type) | |
1da177e4 LT |
658 | { |
659 | struct inode *inode = NULL; | |
660 | struct dentry *result; | |
1305edad CH |
661 | u32 *fh = fid->raw; |
662 | ||
663 | if (fh_len < 5 || fh_type != 3) | |
664 | return NULL; | |
1da177e4 LT |
665 | |
666 | inode = iget(sb, fh[0]); | |
667 | if (!inode || is_bad_inode(inode) || inode->i_generation != fh[1]) { | |
668 | if (inode) | |
669 | iput(inode); | |
670 | inode = NULL; | |
671 | } | |
672 | if (!inode) { | |
673 | loff_t i_pos; | |
674 | int i_logstart = fh[3] & 0x0fffffff; | |
675 | ||
676 | i_pos = (loff_t)fh[2] << 8; | |
677 | i_pos |= ((fh[3] >> 24) & 0xf0) | (fh[4] >> 28); | |
678 | ||
679 | /* try 2 - see if i_pos is in F-d-c | |
680 | * require i_logstart to be the same | |
681 | * Will fail if you truncate and then re-write | |
682 | */ | |
683 | ||
684 | inode = fat_iget(sb, i_pos); | |
685 | if (inode && MSDOS_I(inode)->i_logstart != i_logstart) { | |
686 | iput(inode); | |
687 | inode = NULL; | |
688 | } | |
689 | } | |
690 | if (!inode) { | |
691 | /* For now, do nothing | |
692 | * What we could do is: | |
693 | * follow the file starting at fh[4], and record | |
694 | * the ".." entry, and the name of the fh[2] entry. | |
695 | * The follow the ".." file finding the next step up. | |
696 | * This way we build a path to the root of | |
697 | * the tree. If this works, we lookup the path and so | |
698 | * get this inode into the cache. | |
699 | * Finally try the fat_iget lookup again | |
700 | * If that fails, then weare totally out of luck | |
701 | * But all that is for another day | |
702 | */ | |
703 | } | |
704 | if (!inode) | |
705 | return ERR_PTR(-ESTALE); | |
706 | ||
707 | ||
708 | /* now to find a dentry. | |
709 | * If possible, get a well-connected one | |
710 | */ | |
711 | result = d_alloc_anon(inode); | |
712 | if (result == NULL) { | |
713 | iput(inode); | |
714 | return ERR_PTR(-ENOMEM); | |
715 | } | |
716 | result->d_op = sb->s_root->d_op; | |
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 | { | |
746 | struct buffer_head *bh; | |
747 | struct msdos_dir_entry *de; | |
748 | loff_t i_pos; | |
749 | struct dentry *parent; | |
750 | struct inode *inode; | |
751 | int err; | |
752 | ||
753 | lock_kernel(); | |
754 | ||
755 | err = fat_get_dotdot_entry(child->d_inode, &bh, &de, &i_pos); | |
756 | if (err) { | |
757 | parent = ERR_PTR(err); | |
758 | goto out; | |
759 | } | |
760 | inode = fat_build_inode(child->d_sb, de, i_pos); | |
761 | brelse(bh); | |
762 | if (IS_ERR(inode)) { | |
763 | parent = ERR_PTR(PTR_ERR(inode)); | |
764 | goto out; | |
765 | } | |
766 | parent = d_alloc_anon(inode); | |
767 | if (!parent) { | |
768 | iput(inode); | |
769 | parent = ERR_PTR(-ENOMEM); | |
770 | } | |
771 | out: | |
772 | unlock_kernel(); | |
773 | ||
774 | return parent; | |
775 | } | |
776 | ||
39655164 | 777 | static const struct export_operations fat_export_ops = { |
1da177e4 | 778 | .encode_fh = fat_encode_fh, |
1305edad | 779 | .fh_to_dentry = fat_fh_to_dentry, |
1da177e4 LT |
780 | .get_parent = fat_get_parent, |
781 | }; | |
782 | ||
783 | static int fat_show_options(struct seq_file *m, struct vfsmount *mnt) | |
784 | { | |
785 | struct msdos_sb_info *sbi = MSDOS_SB(mnt->mnt_sb); | |
786 | struct fat_mount_options *opts = &sbi->options; | |
787 | int isvfat = opts->isvfat; | |
788 | ||
789 | if (opts->fs_uid != 0) | |
790 | seq_printf(m, ",uid=%u", opts->fs_uid); | |
791 | if (opts->fs_gid != 0) | |
792 | seq_printf(m, ",gid=%u", opts->fs_gid); | |
793 | seq_printf(m, ",fmask=%04o", opts->fs_fmask); | |
794 | seq_printf(m, ",dmask=%04o", opts->fs_dmask); | |
795 | if (sbi->nls_disk) | |
796 | seq_printf(m, ",codepage=%s", sbi->nls_disk->charset); | |
797 | if (isvfat) { | |
798 | if (sbi->nls_io) | |
799 | seq_printf(m, ",iocharset=%s", sbi->nls_io->charset); | |
800 | ||
801 | switch (opts->shortname) { | |
802 | case VFAT_SFN_DISPLAY_WIN95 | VFAT_SFN_CREATE_WIN95: | |
803 | seq_puts(m, ",shortname=win95"); | |
804 | break; | |
805 | case VFAT_SFN_DISPLAY_WINNT | VFAT_SFN_CREATE_WINNT: | |
806 | seq_puts(m, ",shortname=winnt"); | |
807 | break; | |
808 | case VFAT_SFN_DISPLAY_WINNT | VFAT_SFN_CREATE_WIN95: | |
809 | seq_puts(m, ",shortname=mixed"); | |
810 | break; | |
811 | case VFAT_SFN_DISPLAY_LOWER | VFAT_SFN_CREATE_WIN95: | |
812 | /* seq_puts(m, ",shortname=lower"); */ | |
813 | break; | |
814 | default: | |
815 | seq_puts(m, ",shortname=unknown"); | |
816 | break; | |
817 | } | |
818 | } | |
819 | if (opts->name_check != 'n') | |
820 | seq_printf(m, ",check=%c", opts->name_check); | |
28ec039c OH |
821 | if (opts->usefree) |
822 | seq_puts(m, ",usefree"); | |
1da177e4 LT |
823 | if (opts->quiet) |
824 | seq_puts(m, ",quiet"); | |
825 | if (opts->showexec) | |
826 | seq_puts(m, ",showexec"); | |
827 | if (opts->sys_immutable) | |
828 | seq_puts(m, ",sys_immutable"); | |
829 | if (!isvfat) { | |
830 | if (opts->dotsOK) | |
831 | seq_puts(m, ",dotsOK=yes"); | |
832 | if (opts->nocase) | |
833 | seq_puts(m, ",nocase"); | |
834 | } else { | |
835 | if (opts->utf8) | |
836 | seq_puts(m, ",utf8"); | |
837 | if (opts->unicode_xlate) | |
838 | seq_puts(m, ",uni_xlate"); | |
839 | if (!opts->numtail) | |
840 | seq_puts(m, ",nonumtail"); | |
841 | } | |
842 | ||
843 | return 0; | |
844 | } | |
845 | ||
846 | enum { | |
847 | Opt_check_n, Opt_check_r, Opt_check_s, Opt_uid, Opt_gid, | |
28ec039c | 848 | Opt_umask, Opt_dmask, Opt_fmask, Opt_codepage, Opt_usefree, Opt_nocase, |
1da177e4 LT |
849 | Opt_quiet, Opt_showexec, Opt_debug, Opt_immutable, |
850 | Opt_dots, Opt_nodots, | |
851 | Opt_charset, Opt_shortname_lower, Opt_shortname_win95, | |
852 | Opt_shortname_winnt, Opt_shortname_mixed, Opt_utf8_no, Opt_utf8_yes, | |
853 | Opt_uni_xl_no, Opt_uni_xl_yes, Opt_nonumtail_no, Opt_nonumtail_yes, | |
ae78bf9c | 854 | Opt_obsolate, Opt_flush, Opt_err, |
1da177e4 LT |
855 | }; |
856 | ||
857 | static match_table_t fat_tokens = { | |
858 | {Opt_check_r, "check=relaxed"}, | |
859 | {Opt_check_s, "check=strict"}, | |
860 | {Opt_check_n, "check=normal"}, | |
861 | {Opt_check_r, "check=r"}, | |
862 | {Opt_check_s, "check=s"}, | |
863 | {Opt_check_n, "check=n"}, | |
864 | {Opt_uid, "uid=%u"}, | |
865 | {Opt_gid, "gid=%u"}, | |
866 | {Opt_umask, "umask=%o"}, | |
867 | {Opt_dmask, "dmask=%o"}, | |
868 | {Opt_fmask, "fmask=%o"}, | |
869 | {Opt_codepage, "codepage=%u"}, | |
28ec039c | 870 | {Opt_usefree, "usefree"}, |
1da177e4 LT |
871 | {Opt_nocase, "nocase"}, |
872 | {Opt_quiet, "quiet"}, | |
873 | {Opt_showexec, "showexec"}, | |
874 | {Opt_debug, "debug"}, | |
875 | {Opt_immutable, "sys_immutable"}, | |
876 | {Opt_obsolate, "conv=binary"}, | |
877 | {Opt_obsolate, "conv=text"}, | |
878 | {Opt_obsolate, "conv=auto"}, | |
879 | {Opt_obsolate, "conv=b"}, | |
880 | {Opt_obsolate, "conv=t"}, | |
881 | {Opt_obsolate, "conv=a"}, | |
882 | {Opt_obsolate, "fat=%u"}, | |
883 | {Opt_obsolate, "blocksize=%u"}, | |
884 | {Opt_obsolate, "cvf_format=%20s"}, | |
885 | {Opt_obsolate, "cvf_options=%100s"}, | |
886 | {Opt_obsolate, "posix"}, | |
ae78bf9c CM |
887 | {Opt_flush, "flush"}, |
888 | {Opt_err, NULL}, | |
1da177e4 LT |
889 | }; |
890 | static match_table_t msdos_tokens = { | |
891 | {Opt_nodots, "nodots"}, | |
892 | {Opt_nodots, "dotsOK=no"}, | |
893 | {Opt_dots, "dots"}, | |
894 | {Opt_dots, "dotsOK=yes"}, | |
895 | {Opt_err, NULL} | |
896 | }; | |
897 | static match_table_t vfat_tokens = { | |
898 | {Opt_charset, "iocharset=%s"}, | |
899 | {Opt_shortname_lower, "shortname=lower"}, | |
900 | {Opt_shortname_win95, "shortname=win95"}, | |
901 | {Opt_shortname_winnt, "shortname=winnt"}, | |
902 | {Opt_shortname_mixed, "shortname=mixed"}, | |
903 | {Opt_utf8_no, "utf8=0"}, /* 0 or no or false */ | |
904 | {Opt_utf8_no, "utf8=no"}, | |
905 | {Opt_utf8_no, "utf8=false"}, | |
906 | {Opt_utf8_yes, "utf8=1"}, /* empty or 1 or yes or true */ | |
907 | {Opt_utf8_yes, "utf8=yes"}, | |
908 | {Opt_utf8_yes, "utf8=true"}, | |
909 | {Opt_utf8_yes, "utf8"}, | |
910 | {Opt_uni_xl_no, "uni_xlate=0"}, /* 0 or no or false */ | |
911 | {Opt_uni_xl_no, "uni_xlate=no"}, | |
912 | {Opt_uni_xl_no, "uni_xlate=false"}, | |
913 | {Opt_uni_xl_yes, "uni_xlate=1"}, /* empty or 1 or yes or true */ | |
914 | {Opt_uni_xl_yes, "uni_xlate=yes"}, | |
915 | {Opt_uni_xl_yes, "uni_xlate=true"}, | |
916 | {Opt_uni_xl_yes, "uni_xlate"}, | |
917 | {Opt_nonumtail_no, "nonumtail=0"}, /* 0 or no or false */ | |
918 | {Opt_nonumtail_no, "nonumtail=no"}, | |
919 | {Opt_nonumtail_no, "nonumtail=false"}, | |
920 | {Opt_nonumtail_yes, "nonumtail=1"}, /* empty or 1 or yes or true */ | |
921 | {Opt_nonumtail_yes, "nonumtail=yes"}, | |
922 | {Opt_nonumtail_yes, "nonumtail=true"}, | |
923 | {Opt_nonumtail_yes, "nonumtail"}, | |
924 | {Opt_err, NULL} | |
925 | }; | |
926 | ||
41a34a4f | 927 | static int parse_options(char *options, int is_vfat, int silent, int *debug, |
1da177e4 LT |
928 | struct fat_mount_options *opts) |
929 | { | |
930 | char *p; | |
931 | substring_t args[MAX_OPT_ARGS]; | |
932 | int option; | |
933 | char *iocharset; | |
934 | ||
935 | opts->isvfat = is_vfat; | |
936 | ||
937 | opts->fs_uid = current->uid; | |
938 | opts->fs_gid = current->gid; | |
939 | opts->fs_fmask = opts->fs_dmask = current->fs->umask; | |
940 | opts->codepage = fat_default_codepage; | |
941 | opts->iocharset = fat_default_iocharset; | |
942 | if (is_vfat) | |
943 | opts->shortname = VFAT_SFN_DISPLAY_LOWER|VFAT_SFN_CREATE_WIN95; | |
944 | else | |
945 | opts->shortname = 0; | |
946 | opts->name_check = 'n'; | |
947 | opts->quiet = opts->showexec = opts->sys_immutable = opts->dotsOK = 0; | |
948 | opts->utf8 = opts->unicode_xlate = 0; | |
949 | opts->numtail = 1; | |
28ec039c | 950 | opts->usefree = opts->nocase = 0; |
1da177e4 LT |
951 | *debug = 0; |
952 | ||
953 | if (!options) | |
954 | return 0; | |
955 | ||
956 | while ((p = strsep(&options, ",")) != NULL) { | |
957 | int token; | |
958 | if (!*p) | |
959 | continue; | |
960 | ||
961 | token = match_token(p, fat_tokens, args); | |
962 | if (token == Opt_err) { | |
963 | if (is_vfat) | |
964 | token = match_token(p, vfat_tokens, args); | |
965 | else | |
966 | token = match_token(p, msdos_tokens, args); | |
967 | } | |
968 | switch (token) { | |
969 | case Opt_check_s: | |
970 | opts->name_check = 's'; | |
971 | break; | |
972 | case Opt_check_r: | |
973 | opts->name_check = 'r'; | |
974 | break; | |
975 | case Opt_check_n: | |
976 | opts->name_check = 'n'; | |
977 | break; | |
28ec039c OH |
978 | case Opt_usefree: |
979 | opts->usefree = 1; | |
980 | break; | |
1da177e4 LT |
981 | case Opt_nocase: |
982 | if (!is_vfat) | |
983 | opts->nocase = 1; | |
984 | else { | |
985 | /* for backward compatibility */ | |
986 | opts->shortname = VFAT_SFN_DISPLAY_WIN95 | |
987 | | VFAT_SFN_CREATE_WIN95; | |
988 | } | |
989 | break; | |
990 | case Opt_quiet: | |
991 | opts->quiet = 1; | |
992 | break; | |
993 | case Opt_showexec: | |
994 | opts->showexec = 1; | |
995 | break; | |
996 | case Opt_debug: | |
997 | *debug = 1; | |
998 | break; | |
999 | case Opt_immutable: | |
1000 | opts->sys_immutable = 1; | |
1001 | break; | |
1002 | case Opt_uid: | |
1003 | if (match_int(&args[0], &option)) | |
1004 | return 0; | |
1005 | opts->fs_uid = option; | |
1006 | break; | |
1007 | case Opt_gid: | |
1008 | if (match_int(&args[0], &option)) | |
1009 | return 0; | |
1010 | opts->fs_gid = option; | |
1011 | break; | |
1012 | case Opt_umask: | |
1013 | if (match_octal(&args[0], &option)) | |
1014 | return 0; | |
1015 | opts->fs_fmask = opts->fs_dmask = option; | |
1016 | break; | |
1017 | case Opt_dmask: | |
1018 | if (match_octal(&args[0], &option)) | |
1019 | return 0; | |
1020 | opts->fs_dmask = option; | |
1021 | break; | |
1022 | case Opt_fmask: | |
1023 | if (match_octal(&args[0], &option)) | |
1024 | return 0; | |
1025 | opts->fs_fmask = option; | |
1026 | break; | |
1027 | case Opt_codepage: | |
1028 | if (match_int(&args[0], &option)) | |
1029 | return 0; | |
1030 | opts->codepage = option; | |
1031 | break; | |
ae78bf9c CM |
1032 | case Opt_flush: |
1033 | opts->flush = 1; | |
1034 | break; | |
1da177e4 LT |
1035 | |
1036 | /* msdos specific */ | |
1037 | case Opt_dots: | |
1038 | opts->dotsOK = 1; | |
1039 | break; | |
1040 | case Opt_nodots: | |
1041 | opts->dotsOK = 0; | |
1042 | break; | |
1043 | ||
1044 | /* vfat specific */ | |
1045 | case Opt_charset: | |
1046 | if (opts->iocharset != fat_default_iocharset) | |
1047 | kfree(opts->iocharset); | |
1048 | iocharset = match_strdup(&args[0]); | |
1049 | if (!iocharset) | |
1050 | return -ENOMEM; | |
1051 | opts->iocharset = iocharset; | |
1052 | break; | |
1053 | case Opt_shortname_lower: | |
1054 | opts->shortname = VFAT_SFN_DISPLAY_LOWER | |
1055 | | VFAT_SFN_CREATE_WIN95; | |
1056 | break; | |
1057 | case Opt_shortname_win95: | |
1058 | opts->shortname = VFAT_SFN_DISPLAY_WIN95 | |
1059 | | VFAT_SFN_CREATE_WIN95; | |
1060 | break; | |
1061 | case Opt_shortname_winnt: | |
1062 | opts->shortname = VFAT_SFN_DISPLAY_WINNT | |
1063 | | VFAT_SFN_CREATE_WINNT; | |
1064 | break; | |
1065 | case Opt_shortname_mixed: | |
1066 | opts->shortname = VFAT_SFN_DISPLAY_WINNT | |
1067 | | VFAT_SFN_CREATE_WIN95; | |
1068 | break; | |
1069 | case Opt_utf8_no: /* 0 or no or false */ | |
1070 | opts->utf8 = 0; | |
1071 | break; | |
1072 | case Opt_utf8_yes: /* empty or 1 or yes or true */ | |
1073 | opts->utf8 = 1; | |
1074 | break; | |
1075 | case Opt_uni_xl_no: /* 0 or no or false */ | |
1076 | opts->unicode_xlate = 0; | |
1077 | break; | |
1078 | case Opt_uni_xl_yes: /* empty or 1 or yes or true */ | |
1079 | opts->unicode_xlate = 1; | |
1080 | break; | |
1081 | case Opt_nonumtail_no: /* 0 or no or false */ | |
1082 | opts->numtail = 1; /* negated option */ | |
1083 | break; | |
1084 | case Opt_nonumtail_yes: /* empty or 1 or yes or true */ | |
1085 | opts->numtail = 0; /* negated option */ | |
1086 | break; | |
1087 | ||
1088 | /* obsolete mount options */ | |
1089 | case Opt_obsolate: | |
1090 | printk(KERN_INFO "FAT: \"%s\" option is obsolete, " | |
1091 | "not supported now\n", p); | |
1092 | break; | |
1093 | /* unknown option */ | |
1094 | default: | |
41a34a4f CH |
1095 | if (!silent) { |
1096 | printk(KERN_ERR | |
1097 | "FAT: Unrecognized mount option \"%s\" " | |
1098 | "or missing value\n", p); | |
1099 | } | |
1da177e4 LT |
1100 | return -EINVAL; |
1101 | } | |
1102 | } | |
4de151d8 | 1103 | /* UTF-8 doesn't provide FAT semantics */ |
1da177e4 LT |
1104 | if (!strcmp(opts->iocharset, "utf8")) { |
1105 | printk(KERN_ERR "FAT: utf8 is not a recommended IO charset" | |
1106 | " for FAT filesystems, filesystem will be case sensitive!\n"); | |
1107 | } | |
1108 | ||
1109 | if (opts->unicode_xlate) | |
1110 | opts->utf8 = 0; | |
1111 | ||
1112 | return 0; | |
1113 | } | |
1114 | ||
1115 | static int fat_read_root(struct inode *inode) | |
1116 | { | |
1117 | struct super_block *sb = inode->i_sb; | |
1118 | struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
1119 | int error; | |
1120 | ||
1121 | MSDOS_I(inode)->i_pos = 0; | |
1122 | inode->i_uid = sbi->options.fs_uid; | |
1123 | inode->i_gid = sbi->options.fs_gid; | |
1124 | inode->i_version++; | |
1125 | inode->i_generation = 0; | |
1126 | inode->i_mode = (S_IRWXUGO & ~sbi->options.fs_dmask) | S_IFDIR; | |
1127 | inode->i_op = sbi->dir_ops; | |
1128 | inode->i_fop = &fat_dir_operations; | |
1129 | if (sbi->fat_bits == 32) { | |
1130 | MSDOS_I(inode)->i_start = sbi->root_cluster; | |
1131 | error = fat_calc_dir_size(inode); | |
1132 | if (error < 0) | |
1133 | return error; | |
1134 | } else { | |
1135 | MSDOS_I(inode)->i_start = 0; | |
1136 | inode->i_size = sbi->dir_entries * sizeof(struct msdos_dir_entry); | |
1137 | } | |
1da177e4 LT |
1138 | inode->i_blocks = ((inode->i_size + (sbi->cluster_size - 1)) |
1139 | & ~((loff_t)sbi->cluster_size - 1)) >> 9; | |
1140 | MSDOS_I(inode)->i_logstart = 0; | |
1141 | MSDOS_I(inode)->mmu_private = inode->i_size; | |
1142 | ||
1143 | MSDOS_I(inode)->i_attrs = ATTR_NONE; | |
1144 | inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = 0; | |
1145 | inode->i_mtime.tv_nsec = inode->i_atime.tv_nsec = inode->i_ctime.tv_nsec = 0; | |
1146 | inode->i_nlink = fat_subdirs(inode)+2; | |
1147 | ||
1148 | return 0; | |
1149 | } | |
1150 | ||
1151 | /* | |
1152 | * Read the super block of an MS-DOS FS. | |
1153 | */ | |
1154 | int fat_fill_super(struct super_block *sb, void *data, int silent, | |
754661f1 | 1155 | const struct inode_operations *fs_dir_inode_ops, int isvfat) |
1da177e4 LT |
1156 | { |
1157 | struct inode *root_inode = NULL; | |
1158 | struct buffer_head *bh; | |
1159 | struct fat_boot_sector *b; | |
1160 | struct msdos_sb_info *sbi; | |
1161 | u16 logical_sector_size; | |
1162 | u32 total_sectors, total_clusters, fat_clusters, rootdir_sectors; | |
1163 | int debug; | |
1164 | unsigned int media; | |
1165 | long error; | |
1166 | char buf[50]; | |
1167 | ||
f8314dc6 | 1168 | sbi = kzalloc(sizeof(struct msdos_sb_info), GFP_KERNEL); |
1da177e4 LT |
1169 | if (!sbi) |
1170 | return -ENOMEM; | |
1171 | sb->s_fs_info = sbi; | |
1da177e4 LT |
1172 | |
1173 | sb->s_flags |= MS_NODIRATIME; | |
1174 | sb->s_magic = MSDOS_SUPER_MAGIC; | |
1175 | sb->s_op = &fat_sops; | |
1176 | sb->s_export_op = &fat_export_ops; | |
1177 | sbi->dir_ops = fs_dir_inode_ops; | |
1178 | ||
41a34a4f | 1179 | error = parse_options(data, isvfat, silent, &debug, &sbi->options); |
1da177e4 LT |
1180 | if (error) |
1181 | goto out_fail; | |
1182 | ||
1183 | error = -EIO; | |
1184 | sb_min_blocksize(sb, 512); | |
1185 | bh = sb_bread(sb, 0); | |
1186 | if (bh == NULL) { | |
1187 | printk(KERN_ERR "FAT: unable to read boot sector\n"); | |
1188 | goto out_fail; | |
1189 | } | |
1190 | ||
1191 | b = (struct fat_boot_sector *) bh->b_data; | |
1192 | if (!b->reserved) { | |
1193 | if (!silent) | |
1194 | printk(KERN_ERR "FAT: bogus number of reserved sectors\n"); | |
1195 | brelse(bh); | |
1196 | goto out_invalid; | |
1197 | } | |
1198 | if (!b->fats) { | |
1199 | if (!silent) | |
1200 | printk(KERN_ERR "FAT: bogus number of FAT structure\n"); | |
1201 | brelse(bh); | |
1202 | goto out_invalid; | |
1203 | } | |
1204 | ||
1205 | /* | |
1206 | * Earlier we checked here that b->secs_track and b->head are nonzero, | |
1207 | * but it turns out valid FAT filesystems can have zero there. | |
1208 | */ | |
1209 | ||
1210 | media = b->media; | |
1211 | if (!FAT_VALID_MEDIA(media)) { | |
1212 | if (!silent) | |
1213 | printk(KERN_ERR "FAT: invalid media value (0x%02x)\n", | |
1214 | media); | |
1215 | brelse(bh); | |
1216 | goto out_invalid; | |
1217 | } | |
1218 | logical_sector_size = | |
1219 | le16_to_cpu(get_unaligned((__le16 *)&b->sector_size)); | |
e7d709c0 | 1220 | if (!is_power_of_2(logical_sector_size) |
1da177e4 LT |
1221 | || (logical_sector_size < 512) |
1222 | || (PAGE_CACHE_SIZE < logical_sector_size)) { | |
1223 | if (!silent) | |
1224 | printk(KERN_ERR "FAT: bogus logical sector size %u\n", | |
1225 | logical_sector_size); | |
1226 | brelse(bh); | |
1227 | goto out_invalid; | |
1228 | } | |
1229 | sbi->sec_per_clus = b->sec_per_clus; | |
e7d709c0 | 1230 | if (!is_power_of_2(sbi->sec_per_clus)) { |
1da177e4 LT |
1231 | if (!silent) |
1232 | printk(KERN_ERR "FAT: bogus sectors per cluster %u\n", | |
1233 | sbi->sec_per_clus); | |
1234 | brelse(bh); | |
1235 | goto out_invalid; | |
1236 | } | |
1237 | ||
1238 | if (logical_sector_size < sb->s_blocksize) { | |
1239 | printk(KERN_ERR "FAT: logical sector size too small for device" | |
1240 | " (logical sector size = %u)\n", logical_sector_size); | |
1241 | brelse(bh); | |
1242 | goto out_fail; | |
1243 | } | |
1244 | if (logical_sector_size > sb->s_blocksize) { | |
1245 | brelse(bh); | |
1246 | ||
1247 | if (!sb_set_blocksize(sb, logical_sector_size)) { | |
1248 | printk(KERN_ERR "FAT: unable to set blocksize %u\n", | |
1249 | logical_sector_size); | |
1250 | goto out_fail; | |
1251 | } | |
1252 | bh = sb_bread(sb, 0); | |
1253 | if (bh == NULL) { | |
1254 | printk(KERN_ERR "FAT: unable to read boot sector" | |
1255 | " (logical sector size = %lu)\n", | |
1256 | sb->s_blocksize); | |
1257 | goto out_fail; | |
1258 | } | |
1259 | b = (struct fat_boot_sector *) bh->b_data; | |
1260 | } | |
1261 | ||
1262 | sbi->cluster_size = sb->s_blocksize * sbi->sec_per_clus; | |
1263 | sbi->cluster_bits = ffs(sbi->cluster_size) - 1; | |
1264 | sbi->fats = b->fats; | |
1265 | sbi->fat_bits = 0; /* Don't know yet */ | |
1266 | sbi->fat_start = le16_to_cpu(b->reserved); | |
1267 | sbi->fat_length = le16_to_cpu(b->fat_length); | |
1268 | sbi->root_cluster = 0; | |
1269 | sbi->free_clusters = -1; /* Don't know yet */ | |
1270 | sbi->prev_free = FAT_START_ENT; | |
1271 | ||
1272 | if (!sbi->fat_length && b->fat32_length) { | |
1273 | struct fat_boot_fsinfo *fsinfo; | |
1274 | struct buffer_head *fsinfo_bh; | |
1275 | ||
1276 | /* Must be FAT32 */ | |
1277 | sbi->fat_bits = 32; | |
1278 | sbi->fat_length = le32_to_cpu(b->fat32_length); | |
1279 | sbi->root_cluster = le32_to_cpu(b->root_cluster); | |
1280 | ||
1281 | sb->s_maxbytes = 0xffffffff; | |
1282 | ||
1283 | /* MC - if info_sector is 0, don't multiply by 0 */ | |
1284 | sbi->fsinfo_sector = le16_to_cpu(b->info_sector); | |
1285 | if (sbi->fsinfo_sector == 0) | |
1286 | sbi->fsinfo_sector = 1; | |
1287 | ||
1288 | fsinfo_bh = sb_bread(sb, sbi->fsinfo_sector); | |
1289 | if (fsinfo_bh == NULL) { | |
1290 | printk(KERN_ERR "FAT: bread failed, FSINFO block" | |
1291 | " (sector = %lu)\n", sbi->fsinfo_sector); | |
1292 | brelse(bh); | |
1293 | goto out_fail; | |
1294 | } | |
1295 | ||
1296 | fsinfo = (struct fat_boot_fsinfo *)fsinfo_bh->b_data; | |
1297 | if (!IS_FSINFO(fsinfo)) { | |
1298 | printk(KERN_WARNING | |
1299 | "FAT: Did not find valid FSINFO signature.\n" | |
1300 | " Found signature1 0x%08x signature2 0x%08x" | |
1301 | " (sector = %lu)\n", | |
1302 | le32_to_cpu(fsinfo->signature1), | |
1303 | le32_to_cpu(fsinfo->signature2), | |
1304 | sbi->fsinfo_sector); | |
1305 | } else { | |
28ec039c OH |
1306 | if (sbi->options.usefree) |
1307 | sbi->free_clusters = | |
1308 | le32_to_cpu(fsinfo->free_clusters); | |
1da177e4 LT |
1309 | sbi->prev_free = le32_to_cpu(fsinfo->next_cluster); |
1310 | } | |
1311 | ||
1312 | brelse(fsinfo_bh); | |
1313 | } | |
1314 | ||
1315 | sbi->dir_per_block = sb->s_blocksize / sizeof(struct msdos_dir_entry); | |
1316 | sbi->dir_per_block_bits = ffs(sbi->dir_per_block) - 1; | |
1317 | ||
1318 | sbi->dir_start = sbi->fat_start + sbi->fats * sbi->fat_length; | |
1319 | sbi->dir_entries = | |
1320 | le16_to_cpu(get_unaligned((__le16 *)&b->dir_entries)); | |
1321 | if (sbi->dir_entries & (sbi->dir_per_block - 1)) { | |
1322 | if (!silent) | |
1323 | printk(KERN_ERR "FAT: bogus directroy-entries per block" | |
1324 | " (%u)\n", sbi->dir_entries); | |
1325 | brelse(bh); | |
1326 | goto out_invalid; | |
1327 | } | |
1328 | ||
1329 | rootdir_sectors = sbi->dir_entries | |
1330 | * sizeof(struct msdos_dir_entry) / sb->s_blocksize; | |
1331 | sbi->data_start = sbi->dir_start + rootdir_sectors; | |
1332 | total_sectors = le16_to_cpu(get_unaligned((__le16 *)&b->sectors)); | |
1333 | if (total_sectors == 0) | |
1334 | total_sectors = le32_to_cpu(b->total_sect); | |
1335 | ||
1336 | total_clusters = (total_sectors - sbi->data_start) / sbi->sec_per_clus; | |
1337 | ||
1338 | if (sbi->fat_bits != 32) | |
1339 | sbi->fat_bits = (total_clusters > MAX_FAT12) ? 16 : 12; | |
1340 | ||
1341 | /* check that FAT table does not overflow */ | |
1342 | fat_clusters = sbi->fat_length * sb->s_blocksize * 8 / sbi->fat_bits; | |
1343 | total_clusters = min(total_clusters, fat_clusters - FAT_START_ENT); | |
1344 | if (total_clusters > MAX_FAT(sb)) { | |
1345 | if (!silent) | |
1346 | printk(KERN_ERR "FAT: count of clusters too big (%u)\n", | |
1347 | total_clusters); | |
1348 | brelse(bh); | |
1349 | goto out_invalid; | |
1350 | } | |
1351 | ||
1352 | sbi->max_cluster = total_clusters + FAT_START_ENT; | |
1353 | /* check the free_clusters, it's not necessarily correct */ | |
1354 | if (sbi->free_clusters != -1 && sbi->free_clusters > total_clusters) | |
1355 | sbi->free_clusters = -1; | |
1356 | /* check the prev_free, it's not necessarily correct */ | |
1357 | sbi->prev_free %= sbi->max_cluster; | |
1358 | if (sbi->prev_free < FAT_START_ENT) | |
1359 | sbi->prev_free = FAT_START_ENT; | |
1360 | ||
1361 | brelse(bh); | |
1362 | ||
1363 | /* set up enough so that it can read an inode */ | |
1364 | fat_hash_init(sb); | |
1365 | fat_ent_access_init(sb); | |
1366 | ||
1367 | /* | |
1368 | * The low byte of FAT's first entry must have same value with | |
1369 | * media-field. But in real world, too many devices is | |
1370 | * writing wrong value. So, removed that validity check. | |
1371 | * | |
1372 | * if (FAT_FIRST_ENT(sb, media) != first) | |
1373 | */ | |
1374 | ||
1375 | error = -EINVAL; | |
1376 | sprintf(buf, "cp%d", sbi->options.codepage); | |
1377 | sbi->nls_disk = load_nls(buf); | |
1378 | if (!sbi->nls_disk) { | |
1379 | printk(KERN_ERR "FAT: codepage %s not found\n", buf); | |
1380 | goto out_fail; | |
1381 | } | |
1382 | ||
1383 | /* FIXME: utf8 is using iocharset for upper/lower conversion */ | |
1384 | if (sbi->options.isvfat) { | |
1385 | sbi->nls_io = load_nls(sbi->options.iocharset); | |
1386 | if (!sbi->nls_io) { | |
1387 | printk(KERN_ERR "FAT: IO charset %s not found\n", | |
1388 | sbi->options.iocharset); | |
1389 | goto out_fail; | |
1390 | } | |
1391 | } | |
1392 | ||
1393 | error = -ENOMEM; | |
1394 | root_inode = new_inode(sb); | |
1395 | if (!root_inode) | |
1396 | goto out_fail; | |
1397 | root_inode->i_ino = MSDOS_ROOT_INO; | |
1398 | root_inode->i_version = 1; | |
1399 | error = fat_read_root(root_inode); | |
1400 | if (error < 0) | |
1401 | goto out_fail; | |
1402 | error = -ENOMEM; | |
1403 | insert_inode_hash(root_inode); | |
1404 | sb->s_root = d_alloc_root(root_inode); | |
1405 | if (!sb->s_root) { | |
1406 | printk(KERN_ERR "FAT: get root inode failed\n"); | |
1407 | goto out_fail; | |
1408 | } | |
1409 | ||
1410 | return 0; | |
1411 | ||
1412 | out_invalid: | |
1413 | error = -EINVAL; | |
1414 | if (!silent) | |
1415 | printk(KERN_INFO "VFS: Can't find a valid FAT filesystem" | |
1416 | " on dev %s.\n", sb->s_id); | |
1417 | ||
1418 | out_fail: | |
1419 | if (root_inode) | |
1420 | iput(root_inode); | |
1421 | if (sbi->nls_io) | |
1422 | unload_nls(sbi->nls_io); | |
1423 | if (sbi->nls_disk) | |
1424 | unload_nls(sbi->nls_disk); | |
1425 | if (sbi->options.iocharset != fat_default_iocharset) | |
1426 | kfree(sbi->options.iocharset); | |
1427 | sb->s_fs_info = NULL; | |
1428 | kfree(sbi); | |
1429 | return error; | |
1430 | } | |
1431 | ||
7c709d00 | 1432 | EXPORT_SYMBOL_GPL(fat_fill_super); |
1da177e4 | 1433 | |
ae78bf9c CM |
1434 | /* |
1435 | * helper function for fat_flush_inodes. This writes both the inode | |
1436 | * and the file data blocks, waiting for in flight data blocks before | |
1437 | * the start of the call. It does not wait for any io started | |
1438 | * during the call | |
1439 | */ | |
1440 | static int writeback_inode(struct inode *inode) | |
1441 | { | |
1442 | ||
1443 | int ret; | |
1444 | struct address_space *mapping = inode->i_mapping; | |
1445 | struct writeback_control wbc = { | |
1446 | .sync_mode = WB_SYNC_NONE, | |
1447 | .nr_to_write = 0, | |
1448 | }; | |
1449 | /* if we used WB_SYNC_ALL, sync_inode waits for the io for the | |
1450 | * inode to finish. So WB_SYNC_NONE is sent down to sync_inode | |
1451 | * and filemap_fdatawrite is used for the data blocks | |
1452 | */ | |
1453 | ret = sync_inode(inode, &wbc); | |
1454 | if (!ret) | |
1455 | ret = filemap_fdatawrite(mapping); | |
1456 | return ret; | |
1457 | } | |
1458 | ||
1459 | /* | |
1460 | * write data and metadata corresponding to i1 and i2. The io is | |
1461 | * started but we do not wait for any of it to finish. | |
1462 | * | |
1463 | * filemap_flush is used for the block device, so if there is a dirty | |
1464 | * page for a block already in flight, we will not wait and start the | |
1465 | * io over again | |
1466 | */ | |
1467 | int fat_flush_inodes(struct super_block *sb, struct inode *i1, struct inode *i2) | |
1468 | { | |
1469 | int ret = 0; | |
1470 | if (!MSDOS_SB(sb)->options.flush) | |
1471 | return 0; | |
1472 | if (i1) | |
1473 | ret = writeback_inode(i1); | |
1474 | if (!ret && i2) | |
1475 | ret = writeback_inode(i2); | |
97e860d3 | 1476 | if (!ret) { |
ae78bf9c CM |
1477 | struct address_space *mapping = sb->s_bdev->bd_inode->i_mapping; |
1478 | ret = filemap_flush(mapping); | |
1479 | } | |
1480 | return ret; | |
1481 | } | |
1482 | EXPORT_SYMBOL_GPL(fat_flush_inodes); | |
1483 | ||
1da177e4 LT |
1484 | static int __init init_fat_fs(void) |
1485 | { | |
532a39a3 | 1486 | int err; |
1da177e4 | 1487 | |
532a39a3 PE |
1488 | err = fat_cache_init(); |
1489 | if (err) | |
1490 | return err; | |
1491 | ||
1492 | err = fat_init_inodecache(); | |
1493 | if (err) | |
1494 | goto failed; | |
1495 | ||
1496 | return 0; | |
1497 | ||
1498 | failed: | |
1499 | fat_cache_destroy(); | |
1500 | return err; | |
1da177e4 LT |
1501 | } |
1502 | ||
1503 | static void __exit exit_fat_fs(void) | |
1504 | { | |
1505 | fat_cache_destroy(); | |
1506 | fat_destroy_inodecache(); | |
1507 | } | |
1508 | ||
1509 | module_init(init_fat_fs) | |
1510 | module_exit(exit_fat_fs) | |
1511 | ||
1512 | MODULE_LICENSE("GPL"); |