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
10 * Max Cohan: Fixed invalid FSINFO offset when info_sector is 0
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>
21 #include <linux/mpage.h>
22 #include <linux/buffer_head.h>
23 #include <linux/mount.h>
24 #include <linux/vfs.h>
25 #include <linux/parser.h>
26 #include <linux/uio.h>
27 #include <asm/unaligned.h>
29 #ifndef CONFIG_FAT_DEFAULT_IOCHARSET
30 /* if user don't select VFAT, this is undefined. */
31 #define CONFIG_FAT_DEFAULT_IOCHARSET ""
34 static int fat_default_codepage
= CONFIG_FAT_DEFAULT_CODEPAGE
;
35 static char fat_default_iocharset
[] = CONFIG_FAT_DEFAULT_IOCHARSET
;
38 static int fat_add_cluster(struct inode
*inode
)
42 err
= fat_alloc_clusters(inode
, &cluster
, 1);
45 /* FIXME: this cluster should be added after data of this
46 * cluster is writed */
47 err
= fat_chain_add(inode
, cluster
, 1);
49 fat_free_clusters(inode
, cluster
);
53 static inline int __fat_get_block(struct inode
*inode
, sector_t iblock
,
54 unsigned long *max_blocks
,
55 struct buffer_head
*bh_result
, int create
)
57 struct super_block
*sb
= inode
->i_sb
;
58 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
59 unsigned long mapped_blocks
;
63 err
= fat_bmap(inode
, iblock
, &phys
, &mapped_blocks
);
67 map_bh(bh_result
, sb
, phys
);
68 *max_blocks
= min(mapped_blocks
, *max_blocks
);
74 if (iblock
!= MSDOS_I(inode
)->mmu_private
>> sb
->s_blocksize_bits
) {
75 fat_fs_panic(sb
, "corrupted file size (i_pos %lld, %lld)",
76 MSDOS_I(inode
)->i_pos
, MSDOS_I(inode
)->mmu_private
);
80 offset
= (unsigned long)iblock
& (sbi
->sec_per_clus
- 1);
82 /* TODO: multiple cluster allocation would be desirable. */
83 err
= fat_add_cluster(inode
);
87 /* available blocks on this cluster */
88 mapped_blocks
= sbi
->sec_per_clus
- offset
;
90 *max_blocks
= min(mapped_blocks
, *max_blocks
);
91 MSDOS_I(inode
)->mmu_private
+= *max_blocks
<< sb
->s_blocksize_bits
;
93 err
= fat_bmap(inode
, iblock
, &phys
, &mapped_blocks
);
98 BUG_ON(*max_blocks
!= mapped_blocks
);
99 set_buffer_new(bh_result
);
100 map_bh(bh_result
, sb
, phys
);
105 static int fat_get_block(struct inode
*inode
, sector_t iblock
,
106 struct buffer_head
*bh_result
, int create
)
108 struct super_block
*sb
= inode
->i_sb
;
109 unsigned long max_blocks
= bh_result
->b_size
>> inode
->i_blkbits
;
112 err
= __fat_get_block(inode
, iblock
, &max_blocks
, bh_result
, create
);
115 bh_result
->b_size
= max_blocks
<< sb
->s_blocksize_bits
;
119 static int fat_writepage(struct page
*page
, struct writeback_control
*wbc
)
121 return block_write_full_page(page
, fat_get_block
, wbc
);
124 static int fat_writepages(struct address_space
*mapping
,
125 struct writeback_control
*wbc
)
127 return mpage_writepages(mapping
, wbc
, fat_get_block
);
130 static int fat_readpage(struct file
*file
, struct page
*page
)
132 return mpage_readpage(page
, fat_get_block
);
135 static int fat_readpages(struct file
*file
, struct address_space
*mapping
,
136 struct list_head
*pages
, unsigned nr_pages
)
138 return mpage_readpages(mapping
, pages
, nr_pages
, fat_get_block
);
141 static int fat_prepare_write(struct file
*file
, struct page
*page
,
142 unsigned from
, unsigned to
)
144 return cont_prepare_write(page
, from
, to
, fat_get_block
,
145 &MSDOS_I(page
->mapping
->host
)->mmu_private
);
148 static int fat_commit_write(struct file
*file
, struct page
*page
,
149 unsigned from
, unsigned to
)
151 struct inode
*inode
= page
->mapping
->host
;
152 int err
= generic_commit_write(file
, page
, from
, to
);
153 if (!err
&& !(MSDOS_I(inode
)->i_attrs
& ATTR_ARCH
)) {
154 inode
->i_mtime
= inode
->i_ctime
= CURRENT_TIME_SEC
;
155 MSDOS_I(inode
)->i_attrs
|= ATTR_ARCH
;
156 mark_inode_dirty(inode
);
161 static ssize_t
fat_direct_IO(int rw
, struct kiocb
*iocb
,
162 const struct iovec
*iov
,
163 loff_t offset
, unsigned long nr_segs
)
165 struct file
*file
= iocb
->ki_filp
;
166 struct inode
*inode
= file
->f_mapping
->host
;
170 * FIXME: blockdev_direct_IO() doesn't use ->prepare_write(),
171 * so we need to update the ->mmu_private to block boundary.
173 * But we must fill the remaining area or hole by nul for
174 * updating ->mmu_private.
176 loff_t size
= offset
+ iov_length(iov
, nr_segs
);
177 if (MSDOS_I(inode
)->mmu_private
< size
)
182 * FAT need to use the DIO_LOCKING for avoiding the race
183 * condition of fat_get_block() and ->truncate().
185 return blockdev_direct_IO(rw
, iocb
, inode
, inode
->i_sb
->s_bdev
, iov
,
186 offset
, nr_segs
, fat_get_block
, NULL
);
189 static sector_t
_fat_bmap(struct address_space
*mapping
, sector_t block
)
191 return generic_block_bmap(mapping
, block
, fat_get_block
);
194 static const struct address_space_operations fat_aops
= {
195 .readpage
= fat_readpage
,
196 .readpages
= fat_readpages
,
197 .writepage
= fat_writepage
,
198 .writepages
= fat_writepages
,
199 .sync_page
= block_sync_page
,
200 .prepare_write
= fat_prepare_write
,
201 .commit_write
= fat_commit_write
,
202 .direct_IO
= fat_direct_IO
,
207 * New FAT inode stuff. We do the following:
208 * a) i_ino is constant and has nothing with on-disk location.
209 * b) FAT manages its own cache of directory entries.
210 * c) *This* cache is indexed by on-disk location.
211 * d) inode has an associated directory entry, all right, but
212 * it may be unhashed.
213 * e) currently entries are stored within struct inode. That should
215 * f) we deal with races in the following way:
216 * 1. readdir() and lookup() do FAT-dir-cache lookup.
217 * 2. rename() unhashes the F-d-c entry and rehashes it in
219 * 3. unlink() and rmdir() unhash F-d-c entry.
220 * 4. fat_write_inode() checks whether the thing is unhashed.
221 * If it is we silently return. If it isn't we do bread(),
222 * check if the location is still valid and retry if it
223 * isn't. Otherwise we do changes.
224 * 5. Spinlock is used to protect hash/unhash/location check/lookup
225 * 6. fat_clear_inode() unhashes the F-d-c entry.
226 * 7. lookup() and readdir() do igrab() if they find a F-d-c entry
227 * and consider negative result as cache miss.
230 static void fat_hash_init(struct super_block
*sb
)
232 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
235 spin_lock_init(&sbi
->inode_hash_lock
);
236 for (i
= 0; i
< FAT_HASH_SIZE
; i
++)
237 INIT_HLIST_HEAD(&sbi
->inode_hashtable
[i
]);
240 static inline unsigned long fat_hash(struct super_block
*sb
, loff_t i_pos
)
242 unsigned long tmp
= (unsigned long)i_pos
| (unsigned long) sb
;
243 tmp
= tmp
+ (tmp
>> FAT_HASH_BITS
) + (tmp
>> FAT_HASH_BITS
* 2);
244 return tmp
& FAT_HASH_MASK
;
247 void fat_attach(struct inode
*inode
, loff_t i_pos
)
249 struct super_block
*sb
= inode
->i_sb
;
250 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
252 spin_lock(&sbi
->inode_hash_lock
);
253 MSDOS_I(inode
)->i_pos
= i_pos
;
254 hlist_add_head(&MSDOS_I(inode
)->i_fat_hash
,
255 sbi
->inode_hashtable
+ fat_hash(sb
, i_pos
));
256 spin_unlock(&sbi
->inode_hash_lock
);
259 EXPORT_SYMBOL_GPL(fat_attach
);
261 void fat_detach(struct inode
*inode
)
263 struct msdos_sb_info
*sbi
= MSDOS_SB(inode
->i_sb
);
264 spin_lock(&sbi
->inode_hash_lock
);
265 MSDOS_I(inode
)->i_pos
= 0;
266 hlist_del_init(&MSDOS_I(inode
)->i_fat_hash
);
267 spin_unlock(&sbi
->inode_hash_lock
);
270 EXPORT_SYMBOL_GPL(fat_detach
);
272 struct inode
*fat_iget(struct super_block
*sb
, loff_t i_pos
)
274 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
275 struct hlist_head
*head
= sbi
->inode_hashtable
+ fat_hash(sb
, i_pos
);
276 struct hlist_node
*_p
;
277 struct msdos_inode_info
*i
;
278 struct inode
*inode
= NULL
;
280 spin_lock(&sbi
->inode_hash_lock
);
281 hlist_for_each_entry(i
, _p
, head
, i_fat_hash
) {
282 BUG_ON(i
->vfs_inode
.i_sb
!= sb
);
283 if (i
->i_pos
!= i_pos
)
285 inode
= igrab(&i
->vfs_inode
);
289 spin_unlock(&sbi
->inode_hash_lock
);
293 static int is_exec(unsigned char *extension
)
295 unsigned char *exe_extensions
= "EXECOMBAT", *walk
;
297 for (walk
= exe_extensions
; *walk
; walk
+= 3)
298 if (!strncmp(extension
, walk
, 3))
303 static int fat_calc_dir_size(struct inode
*inode
)
305 struct msdos_sb_info
*sbi
= MSDOS_SB(inode
->i_sb
);
306 int ret
, fclus
, dclus
;
309 if (MSDOS_I(inode
)->i_start
== 0)
312 ret
= fat_get_cluster(inode
, FAT_ENT_EOF
, &fclus
, &dclus
);
315 inode
->i_size
= (fclus
+ 1) << sbi
->cluster_bits
;
320 /* doesn't deal with root inode */
321 static int fat_fill_inode(struct inode
*inode
, struct msdos_dir_entry
*de
)
323 struct msdos_sb_info
*sbi
= MSDOS_SB(inode
->i_sb
);
326 MSDOS_I(inode
)->i_pos
= 0;
327 inode
->i_uid
= sbi
->options
.fs_uid
;
328 inode
->i_gid
= sbi
->options
.fs_gid
;
330 inode
->i_generation
= get_seconds();
332 if ((de
->attr
& ATTR_DIR
) && !IS_FREE(de
->name
)) {
333 inode
->i_generation
&= ~1;
334 inode
->i_mode
= MSDOS_MKMODE(de
->attr
,
335 S_IRWXUGO
& ~sbi
->options
.fs_dmask
) | S_IFDIR
;
336 inode
->i_op
= sbi
->dir_ops
;
337 inode
->i_fop
= &fat_dir_operations
;
339 MSDOS_I(inode
)->i_start
= le16_to_cpu(de
->start
);
340 if (sbi
->fat_bits
== 32)
341 MSDOS_I(inode
)->i_start
|= (le16_to_cpu(de
->starthi
) << 16);
343 MSDOS_I(inode
)->i_logstart
= MSDOS_I(inode
)->i_start
;
344 error
= fat_calc_dir_size(inode
);
347 MSDOS_I(inode
)->mmu_private
= inode
->i_size
;
349 inode
->i_nlink
= fat_subdirs(inode
);
350 } else { /* not a directory */
351 inode
->i_generation
|= 1;
352 inode
->i_mode
= MSDOS_MKMODE(de
->attr
,
353 ((sbi
->options
.showexec
&&
355 ? S_IRUGO
|S_IWUGO
: S_IRWXUGO
)
356 & ~sbi
->options
.fs_fmask
) | S_IFREG
;
357 MSDOS_I(inode
)->i_start
= le16_to_cpu(de
->start
);
358 if (sbi
->fat_bits
== 32)
359 MSDOS_I(inode
)->i_start
|= (le16_to_cpu(de
->starthi
) << 16);
361 MSDOS_I(inode
)->i_logstart
= MSDOS_I(inode
)->i_start
;
362 inode
->i_size
= le32_to_cpu(de
->size
);
363 inode
->i_op
= &fat_file_inode_operations
;
364 inode
->i_fop
= &fat_file_operations
;
365 inode
->i_mapping
->a_ops
= &fat_aops
;
366 MSDOS_I(inode
)->mmu_private
= inode
->i_size
;
368 if (de
->attr
& ATTR_SYS
) {
369 if (sbi
->options
.sys_immutable
)
370 inode
->i_flags
|= S_IMMUTABLE
;
372 MSDOS_I(inode
)->i_attrs
= de
->attr
& ATTR_UNUSED
;
373 inode
->i_blocks
= ((inode
->i_size
+ (sbi
->cluster_size
- 1))
374 & ~((loff_t
)sbi
->cluster_size
- 1)) >> 9;
375 inode
->i_mtime
.tv_sec
=
376 date_dos2unix(le16_to_cpu(de
->time
), le16_to_cpu(de
->date
));
377 inode
->i_mtime
.tv_nsec
= 0;
378 if (sbi
->options
.isvfat
) {
379 int secs
= de
->ctime_cs
/ 100;
380 int csecs
= de
->ctime_cs
% 100;
381 inode
->i_ctime
.tv_sec
=
382 date_dos2unix(le16_to_cpu(de
->ctime
),
383 le16_to_cpu(de
->cdate
)) + secs
;
384 inode
->i_ctime
.tv_nsec
= csecs
* 10000000;
385 inode
->i_atime
.tv_sec
=
386 date_dos2unix(le16_to_cpu(0), le16_to_cpu(de
->adate
));
387 inode
->i_atime
.tv_nsec
= 0;
389 inode
->i_ctime
= inode
->i_atime
= inode
->i_mtime
;
394 struct inode
*fat_build_inode(struct super_block
*sb
,
395 struct msdos_dir_entry
*de
, loff_t i_pos
)
400 inode
= fat_iget(sb
, i_pos
);
403 inode
= new_inode(sb
);
405 inode
= ERR_PTR(-ENOMEM
);
408 inode
->i_ino
= iunique(sb
, MSDOS_ROOT_INO
);
409 inode
->i_version
= 1;
410 err
= fat_fill_inode(inode
, de
);
413 inode
= ERR_PTR(err
);
416 fat_attach(inode
, i_pos
);
417 insert_inode_hash(inode
);
422 EXPORT_SYMBOL_GPL(fat_build_inode
);
424 static void fat_delete_inode(struct inode
*inode
)
426 truncate_inode_pages(&inode
->i_data
, 0);
428 if (!is_bad_inode(inode
)) {
435 static void fat_clear_inode(struct inode
*inode
)
437 struct msdos_sb_info
*sbi
= MSDOS_SB(inode
->i_sb
);
439 if (is_bad_inode(inode
))
442 spin_lock(&sbi
->inode_hash_lock
);
443 fat_cache_inval_inode(inode
);
444 hlist_del_init(&MSDOS_I(inode
)->i_fat_hash
);
445 spin_unlock(&sbi
->inode_hash_lock
);
449 static void fat_write_super(struct super_block
*sb
)
453 if (!(sb
->s_flags
& MS_RDONLY
))
454 fat_clusters_flush(sb
);
457 static void fat_put_super(struct super_block
*sb
)
459 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
462 unload_nls(sbi
->nls_disk
);
463 sbi
->nls_disk
= NULL
;
464 sbi
->options
.codepage
= fat_default_codepage
;
467 unload_nls(sbi
->nls_io
);
470 if (sbi
->options
.iocharset
!= fat_default_iocharset
) {
471 kfree(sbi
->options
.iocharset
);
472 sbi
->options
.iocharset
= fat_default_iocharset
;
475 sb
->s_fs_info
= NULL
;
479 static kmem_cache_t
*fat_inode_cachep
;
481 static struct inode
*fat_alloc_inode(struct super_block
*sb
)
483 struct msdos_inode_info
*ei
;
484 ei
= kmem_cache_alloc(fat_inode_cachep
, SLAB_KERNEL
);
487 return &ei
->vfs_inode
;
490 static void fat_destroy_inode(struct inode
*inode
)
492 kmem_cache_free(fat_inode_cachep
, MSDOS_I(inode
));
495 static void init_once(void * foo
, kmem_cache_t
* cachep
, unsigned long flags
)
497 struct msdos_inode_info
*ei
= (struct msdos_inode_info
*)foo
;
499 if ((flags
& (SLAB_CTOR_VERIFY
|SLAB_CTOR_CONSTRUCTOR
)) ==
500 SLAB_CTOR_CONSTRUCTOR
) {
501 spin_lock_init(&ei
->cache_lru_lock
);
503 ei
->cache_valid_id
= FAT_CACHE_VALID
+ 1;
504 INIT_LIST_HEAD(&ei
->cache_lru
);
505 INIT_HLIST_NODE(&ei
->i_fat_hash
);
506 inode_init_once(&ei
->vfs_inode
);
510 static int __init
fat_init_inodecache(void)
512 fat_inode_cachep
= kmem_cache_create("fat_inode_cache",
513 sizeof(struct msdos_inode_info
),
514 0, (SLAB_RECLAIM_ACCOUNT
|
517 if (fat_inode_cachep
== NULL
)
522 static void __exit
fat_destroy_inodecache(void)
524 kmem_cache_destroy(fat_inode_cachep
);
527 static int fat_remount(struct super_block
*sb
, int *flags
, char *data
)
529 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
530 *flags
|= MS_NODIRATIME
| (sbi
->options
.isvfat
? 0 : MS_NOATIME
);
534 static int fat_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
536 struct msdos_sb_info
*sbi
= MSDOS_SB(dentry
->d_sb
);
538 /* If the count of free cluster is still unknown, counts it here. */
539 if (sbi
->free_clusters
== -1) {
540 int err
= fat_count_free_clusters(dentry
->d_sb
);
545 buf
->f_type
= dentry
->d_sb
->s_magic
;
546 buf
->f_bsize
= sbi
->cluster_size
;
547 buf
->f_blocks
= sbi
->max_cluster
- FAT_START_ENT
;
548 buf
->f_bfree
= sbi
->free_clusters
;
549 buf
->f_bavail
= sbi
->free_clusters
;
550 buf
->f_namelen
= sbi
->options
.isvfat
? 260 : 12;
555 static int fat_write_inode(struct inode
*inode
, int wait
)
557 struct super_block
*sb
= inode
->i_sb
;
558 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
559 struct buffer_head
*bh
;
560 struct msdos_dir_entry
*raw_entry
;
565 i_pos
= MSDOS_I(inode
)->i_pos
;
566 if (inode
->i_ino
== MSDOS_ROOT_INO
|| !i_pos
)
570 bh
= sb_bread(sb
, i_pos
>> sbi
->dir_per_block_bits
);
572 printk(KERN_ERR
"FAT: unable to read inode block "
573 "for updating (i_pos %lld)\n", i_pos
);
577 spin_lock(&sbi
->inode_hash_lock
);
578 if (i_pos
!= MSDOS_I(inode
)->i_pos
) {
579 spin_unlock(&sbi
->inode_hash_lock
);
585 raw_entry
= &((struct msdos_dir_entry
*) (bh
->b_data
))
586 [i_pos
& (sbi
->dir_per_block
- 1)];
587 if (S_ISDIR(inode
->i_mode
))
590 raw_entry
->size
= cpu_to_le32(inode
->i_size
);
591 raw_entry
->attr
= fat_attr(inode
);
592 raw_entry
->start
= cpu_to_le16(MSDOS_I(inode
)->i_logstart
);
593 raw_entry
->starthi
= cpu_to_le16(MSDOS_I(inode
)->i_logstart
>> 16);
594 fat_date_unix2dos(inode
->i_mtime
.tv_sec
, &raw_entry
->time
, &raw_entry
->date
);
595 if (sbi
->options
.isvfat
) {
597 fat_date_unix2dos(inode
->i_ctime
.tv_sec
,&raw_entry
->ctime
,&raw_entry
->cdate
);
598 fat_date_unix2dos(inode
->i_atime
.tv_sec
,&atime
,&raw_entry
->adate
);
599 raw_entry
->ctime_cs
= (inode
->i_ctime
.tv_sec
& 1) * 100 +
600 inode
->i_ctime
.tv_nsec
/ 10000000;
602 spin_unlock(&sbi
->inode_hash_lock
);
603 mark_buffer_dirty(bh
);
605 err
= sync_dirty_buffer(bh
);
612 int fat_sync_inode(struct inode
*inode
)
614 return fat_write_inode(inode
, 1);
617 EXPORT_SYMBOL_GPL(fat_sync_inode
);
619 static int fat_show_options(struct seq_file
*m
, struct vfsmount
*mnt
);
620 static struct super_operations fat_sops
= {
621 .alloc_inode
= fat_alloc_inode
,
622 .destroy_inode
= fat_destroy_inode
,
623 .write_inode
= fat_write_inode
,
624 .delete_inode
= fat_delete_inode
,
625 .put_super
= fat_put_super
,
626 .write_super
= fat_write_super
,
627 .statfs
= fat_statfs
,
628 .clear_inode
= fat_clear_inode
,
629 .remount_fs
= fat_remount
,
631 .read_inode
= make_bad_inode
,
633 .show_options
= fat_show_options
,
637 * a FAT file handle with fhtype 3 is
638 * 0/ i_ino - for fast, reliable lookup if still in the cache
639 * 1/ i_generation - to see if i_ino is still valid
640 * bit 0 == 0 iff directory
641 * 2/ i_pos(8-39) - if ino has changed, but still in cache
642 * 3/ i_pos(4-7)|i_logstart - to semi-verify inode found at i_pos
643 * 4/ i_pos(0-3)|parent->i_logstart - maybe used to hunt for the file on disc
645 * Hack for NFSv2: Maximum FAT entry number is 28bits and maximum
646 * i_pos is 40bits (blocknr(32) + dir offset(8)), so two 4bits
647 * of i_logstart is used to store the directory entry offset.
650 static struct dentry
*
651 fat_decode_fh(struct super_block
*sb
, __u32
*fh
, int len
, int fhtype
,
652 int (*acceptable
)(void *context
, struct dentry
*de
),
656 return ERR_PTR(-ESTALE
);
658 return ERR_PTR(-ESTALE
);
660 return sb
->s_export_op
->find_exported_dentry(sb
, fh
, NULL
, acceptable
, context
);
663 static struct dentry
*fat_get_dentry(struct super_block
*sb
, void *inump
)
665 struct inode
*inode
= NULL
;
666 struct dentry
*result
;
669 inode
= iget(sb
, fh
[0]);
670 if (!inode
|| is_bad_inode(inode
) || inode
->i_generation
!= fh
[1]) {
677 int i_logstart
= fh
[3] & 0x0fffffff;
679 i_pos
= (loff_t
)fh
[2] << 8;
680 i_pos
|= ((fh
[3] >> 24) & 0xf0) | (fh
[4] >> 28);
682 /* try 2 - see if i_pos is in F-d-c
683 * require i_logstart to be the same
684 * Will fail if you truncate and then re-write
687 inode
= fat_iget(sb
, i_pos
);
688 if (inode
&& MSDOS_I(inode
)->i_logstart
!= i_logstart
) {
694 /* For now, do nothing
695 * What we could do is:
696 * follow the file starting at fh[4], and record
697 * the ".." entry, and the name of the fh[2] entry.
698 * The follow the ".." file finding the next step up.
699 * This way we build a path to the root of
700 * the tree. If this works, we lookup the path and so
701 * get this inode into the cache.
702 * Finally try the fat_iget lookup again
703 * If that fails, then weare totally out of luck
704 * But all that is for another day
708 return ERR_PTR(-ESTALE
);
711 /* now to find a dentry.
712 * If possible, get a well-connected one
714 result
= d_alloc_anon(inode
);
715 if (result
== NULL
) {
717 return ERR_PTR(-ENOMEM
);
719 result
->d_op
= sb
->s_root
->d_op
;
724 fat_encode_fh(struct dentry
*de
, __u32
*fh
, int *lenp
, int connectable
)
727 struct inode
*inode
= de
->d_inode
;
728 u32 ipos_h
, ipos_m
, ipos_l
;
731 return 255; /* no room */
733 ipos_h
= MSDOS_I(inode
)->i_pos
>> 8;
734 ipos_m
= (MSDOS_I(inode
)->i_pos
& 0xf0) << 24;
735 ipos_l
= (MSDOS_I(inode
)->i_pos
& 0x0f) << 28;
737 fh
[0] = inode
->i_ino
;
738 fh
[1] = inode
->i_generation
;
740 fh
[3] = ipos_m
| MSDOS_I(inode
)->i_logstart
;
741 spin_lock(&de
->d_lock
);
742 fh
[4] = ipos_l
| MSDOS_I(de
->d_parent
->d_inode
)->i_logstart
;
743 spin_unlock(&de
->d_lock
);
747 static struct dentry
*fat_get_parent(struct dentry
*child
)
749 struct buffer_head
*bh
;
750 struct msdos_dir_entry
*de
;
752 struct dentry
*parent
;
758 err
= fat_get_dotdot_entry(child
->d_inode
, &bh
, &de
, &i_pos
);
760 parent
= ERR_PTR(err
);
763 inode
= fat_build_inode(child
->d_sb
, de
, i_pos
);
766 parent
= ERR_PTR(PTR_ERR(inode
));
769 parent
= d_alloc_anon(inode
);
772 parent
= ERR_PTR(-ENOMEM
);
780 static struct export_operations fat_export_ops
= {
781 .decode_fh
= fat_decode_fh
,
782 .encode_fh
= fat_encode_fh
,
783 .get_dentry
= fat_get_dentry
,
784 .get_parent
= fat_get_parent
,
787 static int fat_show_options(struct seq_file
*m
, struct vfsmount
*mnt
)
789 struct msdos_sb_info
*sbi
= MSDOS_SB(mnt
->mnt_sb
);
790 struct fat_mount_options
*opts
= &sbi
->options
;
791 int isvfat
= opts
->isvfat
;
793 if (opts
->fs_uid
!= 0)
794 seq_printf(m
, ",uid=%u", opts
->fs_uid
);
795 if (opts
->fs_gid
!= 0)
796 seq_printf(m
, ",gid=%u", opts
->fs_gid
);
797 seq_printf(m
, ",fmask=%04o", opts
->fs_fmask
);
798 seq_printf(m
, ",dmask=%04o", opts
->fs_dmask
);
800 seq_printf(m
, ",codepage=%s", sbi
->nls_disk
->charset
);
803 seq_printf(m
, ",iocharset=%s", sbi
->nls_io
->charset
);
805 switch (opts
->shortname
) {
806 case VFAT_SFN_DISPLAY_WIN95
| VFAT_SFN_CREATE_WIN95
:
807 seq_puts(m
, ",shortname=win95");
809 case VFAT_SFN_DISPLAY_WINNT
| VFAT_SFN_CREATE_WINNT
:
810 seq_puts(m
, ",shortname=winnt");
812 case VFAT_SFN_DISPLAY_WINNT
| VFAT_SFN_CREATE_WIN95
:
813 seq_puts(m
, ",shortname=mixed");
815 case VFAT_SFN_DISPLAY_LOWER
| VFAT_SFN_CREATE_WIN95
:
816 /* seq_puts(m, ",shortname=lower"); */
819 seq_puts(m
, ",shortname=unknown");
823 if (opts
->name_check
!= 'n')
824 seq_printf(m
, ",check=%c", opts
->name_check
);
826 seq_puts(m
, ",quiet");
828 seq_puts(m
, ",showexec");
829 if (opts
->sys_immutable
)
830 seq_puts(m
, ",sys_immutable");
833 seq_puts(m
, ",dotsOK=yes");
835 seq_puts(m
, ",nocase");
838 seq_puts(m
, ",utf8");
839 if (opts
->unicode_xlate
)
840 seq_puts(m
, ",uni_xlate");
842 seq_puts(m
, ",nonumtail");
849 Opt_check_n
, Opt_check_r
, Opt_check_s
, Opt_uid
, Opt_gid
,
850 Opt_umask
, Opt_dmask
, Opt_fmask
, Opt_codepage
, Opt_nocase
,
851 Opt_quiet
, Opt_showexec
, Opt_debug
, Opt_immutable
,
852 Opt_dots
, Opt_nodots
,
853 Opt_charset
, Opt_shortname_lower
, Opt_shortname_win95
,
854 Opt_shortname_winnt
, Opt_shortname_mixed
, Opt_utf8_no
, Opt_utf8_yes
,
855 Opt_uni_xl_no
, Opt_uni_xl_yes
, Opt_nonumtail_no
, Opt_nonumtail_yes
,
856 Opt_obsolate
, Opt_err
,
859 static match_table_t fat_tokens
= {
860 {Opt_check_r
, "check=relaxed"},
861 {Opt_check_s
, "check=strict"},
862 {Opt_check_n
, "check=normal"},
863 {Opt_check_r
, "check=r"},
864 {Opt_check_s
, "check=s"},
865 {Opt_check_n
, "check=n"},
868 {Opt_umask
, "umask=%o"},
869 {Opt_dmask
, "dmask=%o"},
870 {Opt_fmask
, "fmask=%o"},
871 {Opt_codepage
, "codepage=%u"},
872 {Opt_nocase
, "nocase"},
873 {Opt_quiet
, "quiet"},
874 {Opt_showexec
, "showexec"},
875 {Opt_debug
, "debug"},
876 {Opt_immutable
, "sys_immutable"},
877 {Opt_obsolate
, "conv=binary"},
878 {Opt_obsolate
, "conv=text"},
879 {Opt_obsolate
, "conv=auto"},
880 {Opt_obsolate
, "conv=b"},
881 {Opt_obsolate
, "conv=t"},
882 {Opt_obsolate
, "conv=a"},
883 {Opt_obsolate
, "fat=%u"},
884 {Opt_obsolate
, "blocksize=%u"},
885 {Opt_obsolate
, "cvf_format=%20s"},
886 {Opt_obsolate
, "cvf_options=%100s"},
887 {Opt_obsolate
, "posix"},
890 static match_table_t msdos_tokens
= {
891 {Opt_nodots
, "nodots"},
892 {Opt_nodots
, "dotsOK=no"},
894 {Opt_dots
, "dotsOK=yes"},
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"},
927 static int parse_options(char *options
, int is_vfat
, int silent
, int *debug
,
928 struct fat_mount_options
*opts
)
931 substring_t args
[MAX_OPT_ARGS
];
935 opts
->isvfat
= is_vfat
;
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
;
943 opts
->shortname
= VFAT_SFN_DISPLAY_LOWER
|VFAT_SFN_CREATE_WIN95
;
946 opts
->name_check
= 'n';
947 opts
->quiet
= opts
->showexec
= opts
->sys_immutable
= opts
->dotsOK
= 0;
948 opts
->utf8
= opts
->unicode_xlate
= 0;
956 while ((p
= strsep(&options
, ",")) != NULL
) {
961 token
= match_token(p
, fat_tokens
, args
);
962 if (token
== Opt_err
) {
964 token
= match_token(p
, vfat_tokens
, args
);
966 token
= match_token(p
, msdos_tokens
, args
);
970 opts
->name_check
= 's';
973 opts
->name_check
= 'r';
976 opts
->name_check
= 'n';
982 /* for backward compatibility */
983 opts
->shortname
= VFAT_SFN_DISPLAY_WIN95
984 | VFAT_SFN_CREATE_WIN95
;
997 opts
->sys_immutable
= 1;
1000 if (match_int(&args
[0], &option
))
1002 opts
->fs_uid
= option
;
1005 if (match_int(&args
[0], &option
))
1007 opts
->fs_gid
= option
;
1010 if (match_octal(&args
[0], &option
))
1012 opts
->fs_fmask
= opts
->fs_dmask
= option
;
1015 if (match_octal(&args
[0], &option
))
1017 opts
->fs_dmask
= option
;
1020 if (match_octal(&args
[0], &option
))
1022 opts
->fs_fmask
= option
;
1025 if (match_int(&args
[0], &option
))
1027 opts
->codepage
= option
;
1030 /* msdos specific */
1040 if (opts
->iocharset
!= fat_default_iocharset
)
1041 kfree(opts
->iocharset
);
1042 iocharset
= match_strdup(&args
[0]);
1045 opts
->iocharset
= iocharset
;
1047 case Opt_shortname_lower
:
1048 opts
->shortname
= VFAT_SFN_DISPLAY_LOWER
1049 | VFAT_SFN_CREATE_WIN95
;
1051 case Opt_shortname_win95
:
1052 opts
->shortname
= VFAT_SFN_DISPLAY_WIN95
1053 | VFAT_SFN_CREATE_WIN95
;
1055 case Opt_shortname_winnt
:
1056 opts
->shortname
= VFAT_SFN_DISPLAY_WINNT
1057 | VFAT_SFN_CREATE_WINNT
;
1059 case Opt_shortname_mixed
:
1060 opts
->shortname
= VFAT_SFN_DISPLAY_WINNT
1061 | VFAT_SFN_CREATE_WIN95
;
1063 case Opt_utf8_no
: /* 0 or no or false */
1066 case Opt_utf8_yes
: /* empty or 1 or yes or true */
1069 case Opt_uni_xl_no
: /* 0 or no or false */
1070 opts
->unicode_xlate
= 0;
1072 case Opt_uni_xl_yes
: /* empty or 1 or yes or true */
1073 opts
->unicode_xlate
= 1;
1075 case Opt_nonumtail_no
: /* 0 or no or false */
1076 opts
->numtail
= 1; /* negated option */
1078 case Opt_nonumtail_yes
: /* empty or 1 or yes or true */
1079 opts
->numtail
= 0; /* negated option */
1082 /* obsolete mount options */
1084 printk(KERN_INFO
"FAT: \"%s\" option is obsolete, "
1085 "not supported now\n", p
);
1087 /* unknown option */
1091 "FAT: Unrecognized mount option \"%s\" "
1092 "or missing value\n", p
);
1097 /* UTF-8 doesn't provide FAT semantics */
1098 if (!strcmp(opts
->iocharset
, "utf8")) {
1099 printk(KERN_ERR
"FAT: utf8 is not a recommended IO charset"
1100 " for FAT filesystems, filesystem will be case sensitive!\n");
1103 if (opts
->unicode_xlate
)
1109 static int fat_read_root(struct inode
*inode
)
1111 struct super_block
*sb
= inode
->i_sb
;
1112 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
1115 MSDOS_I(inode
)->i_pos
= 0;
1116 inode
->i_uid
= sbi
->options
.fs_uid
;
1117 inode
->i_gid
= sbi
->options
.fs_gid
;
1119 inode
->i_generation
= 0;
1120 inode
->i_mode
= (S_IRWXUGO
& ~sbi
->options
.fs_dmask
) | S_IFDIR
;
1121 inode
->i_op
= sbi
->dir_ops
;
1122 inode
->i_fop
= &fat_dir_operations
;
1123 if (sbi
->fat_bits
== 32) {
1124 MSDOS_I(inode
)->i_start
= sbi
->root_cluster
;
1125 error
= fat_calc_dir_size(inode
);
1129 MSDOS_I(inode
)->i_start
= 0;
1130 inode
->i_size
= sbi
->dir_entries
* sizeof(struct msdos_dir_entry
);
1132 inode
->i_blocks
= ((inode
->i_size
+ (sbi
->cluster_size
- 1))
1133 & ~((loff_t
)sbi
->cluster_size
- 1)) >> 9;
1134 MSDOS_I(inode
)->i_logstart
= 0;
1135 MSDOS_I(inode
)->mmu_private
= inode
->i_size
;
1137 MSDOS_I(inode
)->i_attrs
= ATTR_NONE
;
1138 inode
->i_mtime
.tv_sec
= inode
->i_atime
.tv_sec
= inode
->i_ctime
.tv_sec
= 0;
1139 inode
->i_mtime
.tv_nsec
= inode
->i_atime
.tv_nsec
= inode
->i_ctime
.tv_nsec
= 0;
1140 inode
->i_nlink
= fat_subdirs(inode
)+2;
1146 * Read the super block of an MS-DOS FS.
1148 int fat_fill_super(struct super_block
*sb
, void *data
, int silent
,
1149 struct inode_operations
*fs_dir_inode_ops
, int isvfat
)
1151 struct inode
*root_inode
= NULL
;
1152 struct buffer_head
*bh
;
1153 struct fat_boot_sector
*b
;
1154 struct msdos_sb_info
*sbi
;
1155 u16 logical_sector_size
;
1156 u32 total_sectors
, total_clusters
, fat_clusters
, rootdir_sectors
;
1162 sbi
= kzalloc(sizeof(struct msdos_sb_info
), GFP_KERNEL
);
1165 sb
->s_fs_info
= sbi
;
1167 sb
->s_flags
|= MS_NODIRATIME
;
1168 sb
->s_magic
= MSDOS_SUPER_MAGIC
;
1169 sb
->s_op
= &fat_sops
;
1170 sb
->s_export_op
= &fat_export_ops
;
1171 sbi
->dir_ops
= fs_dir_inode_ops
;
1173 error
= parse_options(data
, isvfat
, silent
, &debug
, &sbi
->options
);
1178 sb_min_blocksize(sb
, 512);
1179 bh
= sb_bread(sb
, 0);
1181 printk(KERN_ERR
"FAT: unable to read boot sector\n");
1185 b
= (struct fat_boot_sector
*) bh
->b_data
;
1188 printk(KERN_ERR
"FAT: bogus number of reserved sectors\n");
1194 printk(KERN_ERR
"FAT: bogus number of FAT structure\n");
1200 * Earlier we checked here that b->secs_track and b->head are nonzero,
1201 * but it turns out valid FAT filesystems can have zero there.
1205 if (!FAT_VALID_MEDIA(media
)) {
1207 printk(KERN_ERR
"FAT: invalid media value (0x%02x)\n",
1212 logical_sector_size
=
1213 le16_to_cpu(get_unaligned((__le16
*)&b
->sector_size
));
1214 if (!logical_sector_size
1215 || (logical_sector_size
& (logical_sector_size
- 1))
1216 || (logical_sector_size
< 512)
1217 || (PAGE_CACHE_SIZE
< logical_sector_size
)) {
1219 printk(KERN_ERR
"FAT: bogus logical sector size %u\n",
1220 logical_sector_size
);
1224 sbi
->sec_per_clus
= b
->sec_per_clus
;
1225 if (!sbi
->sec_per_clus
1226 || (sbi
->sec_per_clus
& (sbi
->sec_per_clus
- 1))) {
1228 printk(KERN_ERR
"FAT: bogus sectors per cluster %u\n",
1234 if (logical_sector_size
< sb
->s_blocksize
) {
1235 printk(KERN_ERR
"FAT: logical sector size too small for device"
1236 " (logical sector size = %u)\n", logical_sector_size
);
1240 if (logical_sector_size
> sb
->s_blocksize
) {
1243 if (!sb_set_blocksize(sb
, logical_sector_size
)) {
1244 printk(KERN_ERR
"FAT: unable to set blocksize %u\n",
1245 logical_sector_size
);
1248 bh
= sb_bread(sb
, 0);
1250 printk(KERN_ERR
"FAT: unable to read boot sector"
1251 " (logical sector size = %lu)\n",
1255 b
= (struct fat_boot_sector
*) bh
->b_data
;
1258 sbi
->cluster_size
= sb
->s_blocksize
* sbi
->sec_per_clus
;
1259 sbi
->cluster_bits
= ffs(sbi
->cluster_size
) - 1;
1260 sbi
->fats
= b
->fats
;
1261 sbi
->fat_bits
= 0; /* Don't know yet */
1262 sbi
->fat_start
= le16_to_cpu(b
->reserved
);
1263 sbi
->fat_length
= le16_to_cpu(b
->fat_length
);
1264 sbi
->root_cluster
= 0;
1265 sbi
->free_clusters
= -1; /* Don't know yet */
1266 sbi
->prev_free
= FAT_START_ENT
;
1268 if (!sbi
->fat_length
&& b
->fat32_length
) {
1269 struct fat_boot_fsinfo
*fsinfo
;
1270 struct buffer_head
*fsinfo_bh
;
1274 sbi
->fat_length
= le32_to_cpu(b
->fat32_length
);
1275 sbi
->root_cluster
= le32_to_cpu(b
->root_cluster
);
1277 sb
->s_maxbytes
= 0xffffffff;
1279 /* MC - if info_sector is 0, don't multiply by 0 */
1280 sbi
->fsinfo_sector
= le16_to_cpu(b
->info_sector
);
1281 if (sbi
->fsinfo_sector
== 0)
1282 sbi
->fsinfo_sector
= 1;
1284 fsinfo_bh
= sb_bread(sb
, sbi
->fsinfo_sector
);
1285 if (fsinfo_bh
== NULL
) {
1286 printk(KERN_ERR
"FAT: bread failed, FSINFO block"
1287 " (sector = %lu)\n", sbi
->fsinfo_sector
);
1292 fsinfo
= (struct fat_boot_fsinfo
*)fsinfo_bh
->b_data
;
1293 if (!IS_FSINFO(fsinfo
)) {
1295 "FAT: Did not find valid FSINFO signature.\n"
1296 " Found signature1 0x%08x signature2 0x%08x"
1297 " (sector = %lu)\n",
1298 le32_to_cpu(fsinfo
->signature1
),
1299 le32_to_cpu(fsinfo
->signature2
),
1300 sbi
->fsinfo_sector
);
1302 sbi
->free_clusters
= le32_to_cpu(fsinfo
->free_clusters
);
1303 sbi
->prev_free
= le32_to_cpu(fsinfo
->next_cluster
);
1309 sbi
->dir_per_block
= sb
->s_blocksize
/ sizeof(struct msdos_dir_entry
);
1310 sbi
->dir_per_block_bits
= ffs(sbi
->dir_per_block
) - 1;
1312 sbi
->dir_start
= sbi
->fat_start
+ sbi
->fats
* sbi
->fat_length
;
1314 le16_to_cpu(get_unaligned((__le16
*)&b
->dir_entries
));
1315 if (sbi
->dir_entries
& (sbi
->dir_per_block
- 1)) {
1317 printk(KERN_ERR
"FAT: bogus directroy-entries per block"
1318 " (%u)\n", sbi
->dir_entries
);
1323 rootdir_sectors
= sbi
->dir_entries
1324 * sizeof(struct msdos_dir_entry
) / sb
->s_blocksize
;
1325 sbi
->data_start
= sbi
->dir_start
+ rootdir_sectors
;
1326 total_sectors
= le16_to_cpu(get_unaligned((__le16
*)&b
->sectors
));
1327 if (total_sectors
== 0)
1328 total_sectors
= le32_to_cpu(b
->total_sect
);
1330 total_clusters
= (total_sectors
- sbi
->data_start
) / sbi
->sec_per_clus
;
1332 if (sbi
->fat_bits
!= 32)
1333 sbi
->fat_bits
= (total_clusters
> MAX_FAT12
) ? 16 : 12;
1335 /* check that FAT table does not overflow */
1336 fat_clusters
= sbi
->fat_length
* sb
->s_blocksize
* 8 / sbi
->fat_bits
;
1337 total_clusters
= min(total_clusters
, fat_clusters
- FAT_START_ENT
);
1338 if (total_clusters
> MAX_FAT(sb
)) {
1340 printk(KERN_ERR
"FAT: count of clusters too big (%u)\n",
1346 sbi
->max_cluster
= total_clusters
+ FAT_START_ENT
;
1347 /* check the free_clusters, it's not necessarily correct */
1348 if (sbi
->free_clusters
!= -1 && sbi
->free_clusters
> total_clusters
)
1349 sbi
->free_clusters
= -1;
1350 /* check the prev_free, it's not necessarily correct */
1351 sbi
->prev_free
%= sbi
->max_cluster
;
1352 if (sbi
->prev_free
< FAT_START_ENT
)
1353 sbi
->prev_free
= FAT_START_ENT
;
1357 /* set up enough so that it can read an inode */
1359 fat_ent_access_init(sb
);
1362 * The low byte of FAT's first entry must have same value with
1363 * media-field. But in real world, too many devices is
1364 * writing wrong value. So, removed that validity check.
1366 * if (FAT_FIRST_ENT(sb, media) != first)
1370 sprintf(buf
, "cp%d", sbi
->options
.codepage
);
1371 sbi
->nls_disk
= load_nls(buf
);
1372 if (!sbi
->nls_disk
) {
1373 printk(KERN_ERR
"FAT: codepage %s not found\n", buf
);
1377 /* FIXME: utf8 is using iocharset for upper/lower conversion */
1378 if (sbi
->options
.isvfat
) {
1379 sbi
->nls_io
= load_nls(sbi
->options
.iocharset
);
1381 printk(KERN_ERR
"FAT: IO charset %s not found\n",
1382 sbi
->options
.iocharset
);
1388 root_inode
= new_inode(sb
);
1391 root_inode
->i_ino
= MSDOS_ROOT_INO
;
1392 root_inode
->i_version
= 1;
1393 error
= fat_read_root(root_inode
);
1397 insert_inode_hash(root_inode
);
1398 sb
->s_root
= d_alloc_root(root_inode
);
1400 printk(KERN_ERR
"FAT: get root inode failed\n");
1409 printk(KERN_INFO
"VFS: Can't find a valid FAT filesystem"
1410 " on dev %s.\n", sb
->s_id
);
1416 unload_nls(sbi
->nls_io
);
1418 unload_nls(sbi
->nls_disk
);
1419 if (sbi
->options
.iocharset
!= fat_default_iocharset
)
1420 kfree(sbi
->options
.iocharset
);
1421 sb
->s_fs_info
= NULL
;
1426 EXPORT_SYMBOL_GPL(fat_fill_super
);
1428 static int __init
init_fat_fs(void)
1432 err
= fat_cache_init();
1436 err
= fat_init_inodecache();
1443 fat_cache_destroy();
1447 static void __exit
exit_fat_fs(void)
1449 fat_cache_destroy();
1450 fat_destroy_inodecache();
1453 module_init(init_fat_fs
)
1454 module_exit(exit_fat_fs
)
1456 MODULE_LICENSE("GPL");