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/seq_file.h>
18 #include <linux/pagemap.h>
19 #include <linux/mpage.h>
20 #include <linux/buffer_head.h>
21 #include <linux/exportfs.h>
22 #include <linux/mount.h>
23 #include <linux/vfs.h>
24 #include <linux/parser.h>
25 #include <linux/uio.h>
26 #include <linux/writeback.h>
27 #include <linux/log2.h>
28 #include <linux/hash.h>
29 #include <asm/unaligned.h>
32 #ifndef CONFIG_FAT_DEFAULT_IOCHARSET
33 /* if user don't select VFAT, this is undefined. */
34 #define CONFIG_FAT_DEFAULT_IOCHARSET ""
37 static int fat_default_codepage
= CONFIG_FAT_DEFAULT_CODEPAGE
;
38 static char fat_default_iocharset
[] = CONFIG_FAT_DEFAULT_IOCHARSET
;
41 static int fat_add_cluster(struct inode
*inode
)
45 err
= fat_alloc_clusters(inode
, &cluster
, 1);
48 /* FIXME: this cluster should be added after data of this
49 * cluster is writed */
50 err
= fat_chain_add(inode
, cluster
, 1);
52 fat_free_clusters(inode
, cluster
);
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
)
60 struct super_block
*sb
= inode
->i_sb
;
61 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
62 unsigned long mapped_blocks
;
66 err
= fat_bmap(inode
, iblock
, &phys
, &mapped_blocks
, create
);
70 map_bh(bh_result
, sb
, phys
);
71 *max_blocks
= min(mapped_blocks
, *max_blocks
);
77 if (iblock
!= MSDOS_I(inode
)->mmu_private
>> sb
->s_blocksize_bits
) {
78 fat_fs_error(sb
, "corrupted file size (i_pos %lld, %lld)",
79 MSDOS_I(inode
)->i_pos
, MSDOS_I(inode
)->mmu_private
);
83 offset
= (unsigned long)iblock
& (sbi
->sec_per_clus
- 1);
85 /* TODO: multiple cluster allocation would be desirable. */
86 err
= fat_add_cluster(inode
);
90 /* available blocks on this cluster */
91 mapped_blocks
= sbi
->sec_per_clus
- offset
;
93 *max_blocks
= min(mapped_blocks
, *max_blocks
);
94 MSDOS_I(inode
)->mmu_private
+= *max_blocks
<< sb
->s_blocksize_bits
;
96 err
= fat_bmap(inode
, iblock
, &phys
, &mapped_blocks
, create
);
101 BUG_ON(*max_blocks
!= mapped_blocks
);
102 set_buffer_new(bh_result
);
103 map_bh(bh_result
, sb
, phys
);
108 static int fat_get_block(struct inode
*inode
, sector_t iblock
,
109 struct buffer_head
*bh_result
, int create
)
111 struct super_block
*sb
= inode
->i_sb
;
112 unsigned long max_blocks
= bh_result
->b_size
>> inode
->i_blkbits
;
115 err
= __fat_get_block(inode
, iblock
, &max_blocks
, bh_result
, create
);
118 bh_result
->b_size
= max_blocks
<< sb
->s_blocksize_bits
;
122 static int fat_writepage(struct page
*page
, struct writeback_control
*wbc
)
124 return block_write_full_page(page
, fat_get_block
, wbc
);
127 static int fat_writepages(struct address_space
*mapping
,
128 struct writeback_control
*wbc
)
130 return mpage_writepages(mapping
, wbc
, fat_get_block
);
133 static int fat_readpage(struct file
*file
, struct page
*page
)
135 return mpage_readpage(page
, fat_get_block
);
138 static int fat_readpages(struct file
*file
, struct address_space
*mapping
,
139 struct list_head
*pages
, unsigned nr_pages
)
141 return mpage_readpages(mapping
, pages
, nr_pages
, fat_get_block
);
144 static void fat_write_failed(struct address_space
*mapping
, loff_t to
)
146 struct inode
*inode
= mapping
->host
;
148 if (to
> inode
->i_size
) {
149 truncate_pagecache(inode
, to
, inode
->i_size
);
150 fat_truncate_blocks(inode
, inode
->i_size
);
154 static int fat_write_begin(struct file
*file
, struct address_space
*mapping
,
155 loff_t pos
, unsigned len
, unsigned flags
,
156 struct page
**pagep
, void **fsdata
)
161 err
= cont_write_begin(file
, mapping
, pos
, len
, flags
,
162 pagep
, fsdata
, fat_get_block
,
163 &MSDOS_I(mapping
->host
)->mmu_private
);
165 fat_write_failed(mapping
, pos
+ len
);
169 static int fat_write_end(struct file
*file
, struct address_space
*mapping
,
170 loff_t pos
, unsigned len
, unsigned copied
,
171 struct page
*pagep
, void *fsdata
)
173 struct inode
*inode
= mapping
->host
;
175 err
= generic_write_end(file
, mapping
, pos
, len
, copied
, pagep
, fsdata
);
177 fat_write_failed(mapping
, pos
+ len
);
178 if (!(err
< 0) && !(MSDOS_I(inode
)->i_attrs
& ATTR_ARCH
)) {
179 inode
->i_mtime
= inode
->i_ctime
= CURRENT_TIME_SEC
;
180 MSDOS_I(inode
)->i_attrs
|= ATTR_ARCH
;
181 mark_inode_dirty(inode
);
186 static ssize_t
fat_direct_IO(int rw
, struct kiocb
*iocb
,
187 const struct iovec
*iov
,
188 loff_t offset
, unsigned long nr_segs
)
190 struct file
*file
= iocb
->ki_filp
;
191 struct address_space
*mapping
= file
->f_mapping
;
192 struct inode
*inode
= mapping
->host
;
197 * FIXME: blockdev_direct_IO() doesn't use ->write_begin(),
198 * so we need to update the ->mmu_private to block boundary.
200 * But we must fill the remaining area or hole by nul for
201 * updating ->mmu_private.
203 * Return 0, and fallback to normal buffered write.
205 loff_t size
= offset
+ iov_length(iov
, nr_segs
);
206 if (MSDOS_I(inode
)->mmu_private
< size
)
211 * FAT need to use the DIO_LOCKING for avoiding the race
212 * condition of fat_get_block() and ->truncate().
214 ret
= blockdev_direct_IO(rw
, iocb
, inode
, iov
, offset
, nr_segs
,
216 if (ret
< 0 && (rw
& WRITE
))
217 fat_write_failed(mapping
, offset
+ iov_length(iov
, nr_segs
));
222 static sector_t
_fat_bmap(struct address_space
*mapping
, sector_t block
)
226 /* fat_get_cluster() assumes the requested blocknr isn't truncated. */
227 down_read(&MSDOS_I(mapping
->host
)->truncate_lock
);
228 blocknr
= generic_block_bmap(mapping
, block
, fat_get_block
);
229 up_read(&MSDOS_I(mapping
->host
)->truncate_lock
);
234 static const struct address_space_operations fat_aops
= {
235 .readpage
= fat_readpage
,
236 .readpages
= fat_readpages
,
237 .writepage
= fat_writepage
,
238 .writepages
= fat_writepages
,
239 .write_begin
= fat_write_begin
,
240 .write_end
= fat_write_end
,
241 .direct_IO
= fat_direct_IO
,
246 * New FAT inode stuff. We do the following:
247 * a) i_ino is constant and has nothing with on-disk location.
248 * b) FAT manages its own cache of directory entries.
249 * c) *This* cache is indexed by on-disk location.
250 * d) inode has an associated directory entry, all right, but
251 * it may be unhashed.
252 * e) currently entries are stored within struct inode. That should
254 * f) we deal with races in the following way:
255 * 1. readdir() and lookup() do FAT-dir-cache lookup.
256 * 2. rename() unhashes the F-d-c entry and rehashes it in
258 * 3. unlink() and rmdir() unhash F-d-c entry.
259 * 4. fat_write_inode() checks whether the thing is unhashed.
260 * If it is we silently return. If it isn't we do bread(),
261 * check if the location is still valid and retry if it
262 * isn't. Otherwise we do changes.
263 * 5. Spinlock is used to protect hash/unhash/location check/lookup
264 * 6. fat_evict_inode() unhashes the F-d-c entry.
265 * 7. lookup() and readdir() do igrab() if they find a F-d-c entry
266 * and consider negative result as cache miss.
269 static void fat_hash_init(struct super_block
*sb
)
271 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
274 spin_lock_init(&sbi
->inode_hash_lock
);
275 for (i
= 0; i
< FAT_HASH_SIZE
; i
++)
276 INIT_HLIST_HEAD(&sbi
->inode_hashtable
[i
]);
279 static inline unsigned long fat_hash(loff_t i_pos
)
281 return hash_32(i_pos
, FAT_HASH_BITS
);
284 void fat_attach(struct inode
*inode
, loff_t i_pos
)
286 struct msdos_sb_info
*sbi
= MSDOS_SB(inode
->i_sb
);
287 struct hlist_head
*head
= sbi
->inode_hashtable
+ fat_hash(i_pos
);
289 spin_lock(&sbi
->inode_hash_lock
);
290 MSDOS_I(inode
)->i_pos
= i_pos
;
291 hlist_add_head(&MSDOS_I(inode
)->i_fat_hash
, head
);
292 spin_unlock(&sbi
->inode_hash_lock
);
294 EXPORT_SYMBOL_GPL(fat_attach
);
296 void fat_detach(struct inode
*inode
)
298 struct msdos_sb_info
*sbi
= MSDOS_SB(inode
->i_sb
);
299 spin_lock(&sbi
->inode_hash_lock
);
300 MSDOS_I(inode
)->i_pos
= 0;
301 hlist_del_init(&MSDOS_I(inode
)->i_fat_hash
);
302 spin_unlock(&sbi
->inode_hash_lock
);
304 EXPORT_SYMBOL_GPL(fat_detach
);
306 struct inode
*fat_iget(struct super_block
*sb
, loff_t i_pos
)
308 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
309 struct hlist_head
*head
= sbi
->inode_hashtable
+ fat_hash(i_pos
);
310 struct hlist_node
*_p
;
311 struct msdos_inode_info
*i
;
312 struct inode
*inode
= NULL
;
314 spin_lock(&sbi
->inode_hash_lock
);
315 hlist_for_each_entry(i
, _p
, head
, i_fat_hash
) {
316 BUG_ON(i
->vfs_inode
.i_sb
!= sb
);
317 if (i
->i_pos
!= i_pos
)
319 inode
= igrab(&i
->vfs_inode
);
323 spin_unlock(&sbi
->inode_hash_lock
);
327 static int is_exec(unsigned char *extension
)
329 unsigned char *exe_extensions
= "EXECOMBAT", *walk
;
331 for (walk
= exe_extensions
; *walk
; walk
+= 3)
332 if (!strncmp(extension
, walk
, 3))
337 static int fat_calc_dir_size(struct inode
*inode
)
339 struct msdos_sb_info
*sbi
= MSDOS_SB(inode
->i_sb
);
340 int ret
, fclus
, dclus
;
343 if (MSDOS_I(inode
)->i_start
== 0)
346 ret
= fat_get_cluster(inode
, FAT_ENT_EOF
, &fclus
, &dclus
);
349 inode
->i_size
= (fclus
+ 1) << sbi
->cluster_bits
;
354 /* doesn't deal with root inode */
355 static int fat_fill_inode(struct inode
*inode
, struct msdos_dir_entry
*de
)
357 struct msdos_sb_info
*sbi
= MSDOS_SB(inode
->i_sb
);
360 MSDOS_I(inode
)->i_pos
= 0;
361 inode
->i_uid
= sbi
->options
.fs_uid
;
362 inode
->i_gid
= sbi
->options
.fs_gid
;
364 inode
->i_generation
= get_seconds();
366 if ((de
->attr
& ATTR_DIR
) && !IS_FREE(de
->name
)) {
367 inode
->i_generation
&= ~1;
368 inode
->i_mode
= fat_make_mode(sbi
, de
->attr
, S_IRWXUGO
);
369 inode
->i_op
= sbi
->dir_ops
;
370 inode
->i_fop
= &fat_dir_operations
;
372 MSDOS_I(inode
)->i_start
= fat_get_start(sbi
, de
);
373 MSDOS_I(inode
)->i_logstart
= MSDOS_I(inode
)->i_start
;
374 error
= fat_calc_dir_size(inode
);
377 MSDOS_I(inode
)->mmu_private
= inode
->i_size
;
379 set_nlink(inode
, fat_subdirs(inode
));
380 } else { /* not a directory */
381 inode
->i_generation
|= 1;
382 inode
->i_mode
= fat_make_mode(sbi
, de
->attr
,
383 ((sbi
->options
.showexec
&& !is_exec(de
->name
+ 8))
384 ? S_IRUGO
|S_IWUGO
: S_IRWXUGO
));
385 MSDOS_I(inode
)->i_start
= fat_get_start(sbi
, de
);
387 MSDOS_I(inode
)->i_logstart
= MSDOS_I(inode
)->i_start
;
388 inode
->i_size
= le32_to_cpu(de
->size
);
389 inode
->i_op
= &fat_file_inode_operations
;
390 inode
->i_fop
= &fat_file_operations
;
391 inode
->i_mapping
->a_ops
= &fat_aops
;
392 MSDOS_I(inode
)->mmu_private
= inode
->i_size
;
394 if (de
->attr
& ATTR_SYS
) {
395 if (sbi
->options
.sys_immutable
)
396 inode
->i_flags
|= S_IMMUTABLE
;
398 fat_save_attrs(inode
, de
->attr
);
400 inode
->i_blocks
= ((inode
->i_size
+ (sbi
->cluster_size
- 1))
401 & ~((loff_t
)sbi
->cluster_size
- 1)) >> 9;
403 fat_time_fat2unix(sbi
, &inode
->i_mtime
, de
->time
, de
->date
, 0);
404 if (sbi
->options
.isvfat
) {
405 fat_time_fat2unix(sbi
, &inode
->i_ctime
, de
->ctime
,
406 de
->cdate
, de
->ctime_cs
);
407 fat_time_fat2unix(sbi
, &inode
->i_atime
, 0, de
->adate
, 0);
409 inode
->i_ctime
= inode
->i_atime
= inode
->i_mtime
;
414 struct inode
*fat_build_inode(struct super_block
*sb
,
415 struct msdos_dir_entry
*de
, loff_t i_pos
)
420 inode
= fat_iget(sb
, i_pos
);
423 inode
= new_inode(sb
);
425 inode
= ERR_PTR(-ENOMEM
);
428 inode
->i_ino
= iunique(sb
, MSDOS_ROOT_INO
);
429 inode
->i_version
= 1;
430 err
= fat_fill_inode(inode
, de
);
433 inode
= ERR_PTR(err
);
436 fat_attach(inode
, i_pos
);
437 insert_inode_hash(inode
);
442 EXPORT_SYMBOL_GPL(fat_build_inode
);
444 static void fat_evict_inode(struct inode
*inode
)
446 truncate_inode_pages(&inode
->i_data
, 0);
447 if (!inode
->i_nlink
) {
449 fat_truncate_blocks(inode
, 0);
451 invalidate_inode_buffers(inode
);
453 fat_cache_inval_inode(inode
);
457 static void fat_put_super(struct super_block
*sb
)
459 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
461 iput(sbi
->fsinfo_inode
);
462 iput(sbi
->fat_inode
);
464 unload_nls(sbi
->nls_disk
);
465 unload_nls(sbi
->nls_io
);
467 if (sbi
->options
.iocharset
!= fat_default_iocharset
)
468 kfree(sbi
->options
.iocharset
);
470 sb
->s_fs_info
= NULL
;
474 static struct kmem_cache
*fat_inode_cachep
;
476 static struct inode
*fat_alloc_inode(struct super_block
*sb
)
478 struct msdos_inode_info
*ei
;
479 ei
= kmem_cache_alloc(fat_inode_cachep
, GFP_NOFS
);
483 init_rwsem(&ei
->truncate_lock
);
484 return &ei
->vfs_inode
;
487 static void fat_i_callback(struct rcu_head
*head
)
489 struct inode
*inode
= container_of(head
, struct inode
, i_rcu
);
490 kmem_cache_free(fat_inode_cachep
, MSDOS_I(inode
));
493 static void fat_destroy_inode(struct inode
*inode
)
495 call_rcu(&inode
->i_rcu
, fat_i_callback
);
498 static void init_once(void *foo
)
500 struct msdos_inode_info
*ei
= (struct msdos_inode_info
*)foo
;
502 spin_lock_init(&ei
->cache_lru_lock
);
504 ei
->cache_valid_id
= FAT_CACHE_VALID
+ 1;
505 INIT_LIST_HEAD(&ei
->cache_lru
);
506 INIT_HLIST_NODE(&ei
->i_fat_hash
);
507 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 super_block
*sb
= dentry
->d_sb
;
537 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
538 u64 id
= huge_encode_dev(sb
->s_bdev
->bd_dev
);
540 /* If the count of free cluster is still unknown, counts it here. */
541 if (sbi
->free_clusters
== -1 || !sbi
->free_clus_valid
) {
542 int err
= fat_count_free_clusters(dentry
->d_sb
);
547 buf
->f_type
= dentry
->d_sb
->s_magic
;
548 buf
->f_bsize
= sbi
->cluster_size
;
549 buf
->f_blocks
= sbi
->max_cluster
- FAT_START_ENT
;
550 buf
->f_bfree
= sbi
->free_clusters
;
551 buf
->f_bavail
= sbi
->free_clusters
;
552 buf
->f_fsid
.val
[0] = (u32
)id
;
553 buf
->f_fsid
.val
[1] = (u32
)(id
>> 32);
555 (sbi
->options
.isvfat
? FAT_LFN_LEN
: 12) * NLS_MAX_CHARSET_SIZE
;
560 static inline loff_t
fat_i_pos_read(struct msdos_sb_info
*sbi
,
564 #if BITS_PER_LONG == 32
565 spin_lock(&sbi
->inode_hash_lock
);
567 i_pos
= MSDOS_I(inode
)->i_pos
;
568 #if BITS_PER_LONG == 32
569 spin_unlock(&sbi
->inode_hash_lock
);
574 static int __fat_write_inode(struct inode
*inode
, int wait
)
576 struct super_block
*sb
= inode
->i_sb
;
577 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
578 struct buffer_head
*bh
;
579 struct msdos_dir_entry
*raw_entry
;
583 if (inode
->i_ino
== MSDOS_ROOT_INO
)
587 i_pos
= fat_i_pos_read(sbi
, inode
);
591 bh
= sb_bread(sb
, i_pos
>> sbi
->dir_per_block_bits
);
593 fat_msg(sb
, KERN_ERR
, "unable to read inode block "
594 "for updating (i_pos %lld)", i_pos
);
597 spin_lock(&sbi
->inode_hash_lock
);
598 if (i_pos
!= MSDOS_I(inode
)->i_pos
) {
599 spin_unlock(&sbi
->inode_hash_lock
);
604 raw_entry
= &((struct msdos_dir_entry
*) (bh
->b_data
))
605 [i_pos
& (sbi
->dir_per_block
- 1)];
606 if (S_ISDIR(inode
->i_mode
))
609 raw_entry
->size
= cpu_to_le32(inode
->i_size
);
610 raw_entry
->attr
= fat_make_attrs(inode
);
611 fat_set_start(raw_entry
, MSDOS_I(inode
)->i_logstart
);
612 fat_time_unix2fat(sbi
, &inode
->i_mtime
, &raw_entry
->time
,
613 &raw_entry
->date
, NULL
);
614 if (sbi
->options
.isvfat
) {
616 fat_time_unix2fat(sbi
, &inode
->i_ctime
, &raw_entry
->ctime
,
617 &raw_entry
->cdate
, &raw_entry
->ctime_cs
);
618 fat_time_unix2fat(sbi
, &inode
->i_atime
, &atime
,
619 &raw_entry
->adate
, NULL
);
621 spin_unlock(&sbi
->inode_hash_lock
);
622 mark_buffer_dirty(bh
);
625 err
= sync_dirty_buffer(bh
);
630 static int fat_write_inode(struct inode
*inode
, struct writeback_control
*wbc
)
634 if (inode
->i_ino
== MSDOS_FSINFO_INO
) {
635 struct super_block
*sb
= inode
->i_sb
;
638 err
= fat_clusters_flush(sb
);
641 err
= __fat_write_inode(inode
, wbc
->sync_mode
== WB_SYNC_ALL
);
646 int fat_sync_inode(struct inode
*inode
)
648 return __fat_write_inode(inode
, 1);
651 EXPORT_SYMBOL_GPL(fat_sync_inode
);
653 static int fat_show_options(struct seq_file
*m
, struct dentry
*root
);
654 static const struct super_operations fat_sops
= {
655 .alloc_inode
= fat_alloc_inode
,
656 .destroy_inode
= fat_destroy_inode
,
657 .write_inode
= fat_write_inode
,
658 .evict_inode
= fat_evict_inode
,
659 .put_super
= fat_put_super
,
660 .statfs
= fat_statfs
,
661 .remount_fs
= fat_remount
,
663 .show_options
= fat_show_options
,
667 * a FAT file handle with fhtype 3 is
668 * 0/ i_ino - for fast, reliable lookup if still in the cache
669 * 1/ i_generation - to see if i_ino is still valid
670 * bit 0 == 0 iff directory
671 * 2/ i_pos(8-39) - if ino has changed, but still in cache
672 * 3/ i_pos(4-7)|i_logstart - to semi-verify inode found at i_pos
673 * 4/ i_pos(0-3)|parent->i_logstart - maybe used to hunt for the file on disc
675 * Hack for NFSv2: Maximum FAT entry number is 28bits and maximum
676 * i_pos is 40bits (blocknr(32) + dir offset(8)), so two 4bits
677 * of i_logstart is used to store the directory entry offset.
680 static struct dentry
*fat_fh_to_dentry(struct super_block
*sb
,
681 struct fid
*fid
, int fh_len
, int fh_type
)
683 struct inode
*inode
= NULL
;
686 if (fh_len
< 5 || fh_type
!= 3)
689 inode
= ilookup(sb
, fh
[0]);
690 if (!inode
|| inode
->i_generation
!= fh
[1]) {
697 int i_logstart
= fh
[3] & 0x0fffffff;
699 i_pos
= (loff_t
)fh
[2] << 8;
700 i_pos
|= ((fh
[3] >> 24) & 0xf0) | (fh
[4] >> 28);
702 /* try 2 - see if i_pos is in F-d-c
703 * require i_logstart to be the same
704 * Will fail if you truncate and then re-write
707 inode
= fat_iget(sb
, i_pos
);
708 if (inode
&& MSDOS_I(inode
)->i_logstart
!= i_logstart
) {
715 * For now, do nothing if the inode is not found.
717 * What we could do is:
719 * - follow the file starting at fh[4], and record the ".." entry,
720 * and the name of the fh[2] entry.
721 * - then follow the ".." file finding the next step up.
723 * This way we build a path to the root of the tree. If this works, we
724 * lookup the path and so get this inode into the cache. Finally try
725 * the fat_iget lookup again. If that fails, then we are totally out
726 * of luck. But all that is for another day
728 return d_obtain_alias(inode
);
732 fat_encode_fh(struct inode
*inode
, __u32
*fh
, int *lenp
, struct inode
*parent
)
735 struct msdos_sb_info
*sbi
= MSDOS_SB(inode
->i_sb
);
740 return 255; /* no room */
743 i_pos
= fat_i_pos_read(sbi
, inode
);
745 fh
[0] = inode
->i_ino
;
746 fh
[1] = inode
->i_generation
;
748 fh
[3] = ((i_pos
& 0xf0) << 24) | MSDOS_I(inode
)->i_logstart
;
749 fh
[4] = (i_pos
& 0x0f) << 28;
751 fh
[4] |= MSDOS_I(parent
)->i_logstart
;
755 static struct dentry
*fat_get_parent(struct dentry
*child
)
757 struct super_block
*sb
= child
->d_sb
;
758 struct buffer_head
*bh
;
759 struct msdos_dir_entry
*de
;
761 struct dentry
*parent
;
767 err
= fat_get_dotdot_entry(child
->d_inode
, &bh
, &de
, &i_pos
);
769 parent
= ERR_PTR(err
);
772 inode
= fat_build_inode(sb
, de
, i_pos
);
775 parent
= d_obtain_alias(inode
);
782 static const struct export_operations fat_export_ops
= {
783 .encode_fh
= fat_encode_fh
,
784 .fh_to_dentry
= fat_fh_to_dentry
,
785 .get_parent
= fat_get_parent
,
788 static int fat_show_options(struct seq_file
*m
, struct dentry
*root
)
790 struct msdos_sb_info
*sbi
= MSDOS_SB(root
->d_sb
);
791 struct fat_mount_options
*opts
= &sbi
->options
;
792 int isvfat
= opts
->isvfat
;
794 if (opts
->fs_uid
!= 0)
795 seq_printf(m
, ",uid=%u", opts
->fs_uid
);
796 if (opts
->fs_gid
!= 0)
797 seq_printf(m
, ",gid=%u", opts
->fs_gid
);
798 seq_printf(m
, ",fmask=%04o", opts
->fs_fmask
);
799 seq_printf(m
, ",dmask=%04o", opts
->fs_dmask
);
800 if (opts
->allow_utime
)
801 seq_printf(m
, ",allow_utime=%04o", opts
->allow_utime
);
803 seq_printf(m
, ",codepage=%s", sbi
->nls_disk
->charset
);
806 seq_printf(m
, ",iocharset=%s", sbi
->nls_io
->charset
);
808 switch (opts
->shortname
) {
809 case VFAT_SFN_DISPLAY_WIN95
| VFAT_SFN_CREATE_WIN95
:
810 seq_puts(m
, ",shortname=win95");
812 case VFAT_SFN_DISPLAY_WINNT
| VFAT_SFN_CREATE_WINNT
:
813 seq_puts(m
, ",shortname=winnt");
815 case VFAT_SFN_DISPLAY_WINNT
| VFAT_SFN_CREATE_WIN95
:
816 seq_puts(m
, ",shortname=mixed");
818 case VFAT_SFN_DISPLAY_LOWER
| VFAT_SFN_CREATE_WIN95
:
819 seq_puts(m
, ",shortname=lower");
822 seq_puts(m
, ",shortname=unknown");
826 if (opts
->name_check
!= 'n')
827 seq_printf(m
, ",check=%c", opts
->name_check
);
829 seq_puts(m
, ",usefree");
831 seq_puts(m
, ",quiet");
833 seq_puts(m
, ",showexec");
834 if (opts
->sys_immutable
)
835 seq_puts(m
, ",sys_immutable");
838 seq_puts(m
, ",dotsOK=yes");
840 seq_puts(m
, ",nocase");
843 seq_puts(m
, ",utf8");
844 if (opts
->unicode_xlate
)
845 seq_puts(m
, ",uni_xlate");
847 seq_puts(m
, ",nonumtail");
849 seq_puts(m
, ",rodir");
852 seq_puts(m
, ",flush");
854 seq_puts(m
, ",tz=UTC");
855 if (opts
->errors
== FAT_ERRORS_CONT
)
856 seq_puts(m
, ",errors=continue");
857 else if (opts
->errors
== FAT_ERRORS_PANIC
)
858 seq_puts(m
, ",errors=panic");
860 seq_puts(m
, ",errors=remount-ro");
862 seq_puts(m
, ",discard");
868 Opt_check_n
, Opt_check_r
, Opt_check_s
, Opt_uid
, Opt_gid
,
869 Opt_umask
, Opt_dmask
, Opt_fmask
, Opt_allow_utime
, Opt_codepage
,
870 Opt_usefree
, Opt_nocase
, Opt_quiet
, Opt_showexec
, Opt_debug
,
871 Opt_immutable
, Opt_dots
, Opt_nodots
,
872 Opt_charset
, Opt_shortname_lower
, Opt_shortname_win95
,
873 Opt_shortname_winnt
, Opt_shortname_mixed
, Opt_utf8_no
, Opt_utf8_yes
,
874 Opt_uni_xl_no
, Opt_uni_xl_yes
, Opt_nonumtail_no
, Opt_nonumtail_yes
,
875 Opt_obsolete
, Opt_flush
, Opt_tz_utc
, Opt_rodir
, Opt_err_cont
,
876 Opt_err_panic
, Opt_err_ro
, Opt_discard
, Opt_err
,
879 static const match_table_t fat_tokens
= {
880 {Opt_check_r
, "check=relaxed"},
881 {Opt_check_s
, "check=strict"},
882 {Opt_check_n
, "check=normal"},
883 {Opt_check_r
, "check=r"},
884 {Opt_check_s
, "check=s"},
885 {Opt_check_n
, "check=n"},
888 {Opt_umask
, "umask=%o"},
889 {Opt_dmask
, "dmask=%o"},
890 {Opt_fmask
, "fmask=%o"},
891 {Opt_allow_utime
, "allow_utime=%o"},
892 {Opt_codepage
, "codepage=%u"},
893 {Opt_usefree
, "usefree"},
894 {Opt_nocase
, "nocase"},
895 {Opt_quiet
, "quiet"},
896 {Opt_showexec
, "showexec"},
897 {Opt_debug
, "debug"},
898 {Opt_immutable
, "sys_immutable"},
899 {Opt_flush
, "flush"},
900 {Opt_tz_utc
, "tz=UTC"},
901 {Opt_err_cont
, "errors=continue"},
902 {Opt_err_panic
, "errors=panic"},
903 {Opt_err_ro
, "errors=remount-ro"},
904 {Opt_discard
, "discard"},
905 {Opt_obsolete
, "conv=binary"},
906 {Opt_obsolete
, "conv=text"},
907 {Opt_obsolete
, "conv=auto"},
908 {Opt_obsolete
, "conv=b"},
909 {Opt_obsolete
, "conv=t"},
910 {Opt_obsolete
, "conv=a"},
911 {Opt_obsolete
, "fat=%u"},
912 {Opt_obsolete
, "blocksize=%u"},
913 {Opt_obsolete
, "cvf_format=%20s"},
914 {Opt_obsolete
, "cvf_options=%100s"},
915 {Opt_obsolete
, "posix"},
918 static const match_table_t msdos_tokens
= {
919 {Opt_nodots
, "nodots"},
920 {Opt_nodots
, "dotsOK=no"},
922 {Opt_dots
, "dotsOK=yes"},
925 static const match_table_t vfat_tokens
= {
926 {Opt_charset
, "iocharset=%s"},
927 {Opt_shortname_lower
, "shortname=lower"},
928 {Opt_shortname_win95
, "shortname=win95"},
929 {Opt_shortname_winnt
, "shortname=winnt"},
930 {Opt_shortname_mixed
, "shortname=mixed"},
931 {Opt_utf8_no
, "utf8=0"}, /* 0 or no or false */
932 {Opt_utf8_no
, "utf8=no"},
933 {Opt_utf8_no
, "utf8=false"},
934 {Opt_utf8_yes
, "utf8=1"}, /* empty or 1 or yes or true */
935 {Opt_utf8_yes
, "utf8=yes"},
936 {Opt_utf8_yes
, "utf8=true"},
937 {Opt_utf8_yes
, "utf8"},
938 {Opt_uni_xl_no
, "uni_xlate=0"}, /* 0 or no or false */
939 {Opt_uni_xl_no
, "uni_xlate=no"},
940 {Opt_uni_xl_no
, "uni_xlate=false"},
941 {Opt_uni_xl_yes
, "uni_xlate=1"}, /* empty or 1 or yes or true */
942 {Opt_uni_xl_yes
, "uni_xlate=yes"},
943 {Opt_uni_xl_yes
, "uni_xlate=true"},
944 {Opt_uni_xl_yes
, "uni_xlate"},
945 {Opt_nonumtail_no
, "nonumtail=0"}, /* 0 or no or false */
946 {Opt_nonumtail_no
, "nonumtail=no"},
947 {Opt_nonumtail_no
, "nonumtail=false"},
948 {Opt_nonumtail_yes
, "nonumtail=1"}, /* empty or 1 or yes or true */
949 {Opt_nonumtail_yes
, "nonumtail=yes"},
950 {Opt_nonumtail_yes
, "nonumtail=true"},
951 {Opt_nonumtail_yes
, "nonumtail"},
952 {Opt_rodir
, "rodir"},
956 static int parse_options(struct super_block
*sb
, char *options
, int is_vfat
,
957 int silent
, int *debug
, struct fat_mount_options
*opts
)
960 substring_t args
[MAX_OPT_ARGS
];
964 opts
->isvfat
= is_vfat
;
966 opts
->fs_uid
= current_uid();
967 opts
->fs_gid
= current_gid();
968 opts
->fs_fmask
= opts
->fs_dmask
= current_umask();
969 opts
->allow_utime
= -1;
970 opts
->codepage
= fat_default_codepage
;
971 opts
->iocharset
= fat_default_iocharset
;
973 opts
->shortname
= VFAT_SFN_DISPLAY_WINNT
|VFAT_SFN_CREATE_WIN95
;
979 opts
->name_check
= 'n';
980 opts
->quiet
= opts
->showexec
= opts
->sys_immutable
= opts
->dotsOK
= 0;
981 opts
->utf8
= opts
->unicode_xlate
= 0;
983 opts
->usefree
= opts
->nocase
= 0;
985 opts
->errors
= FAT_ERRORS_RO
;
991 while ((p
= strsep(&options
, ",")) != NULL
) {
996 token
= match_token(p
, fat_tokens
, args
);
997 if (token
== Opt_err
) {
999 token
= match_token(p
, vfat_tokens
, args
);
1001 token
= match_token(p
, msdos_tokens
, args
);
1005 opts
->name_check
= 's';
1008 opts
->name_check
= 'r';
1011 opts
->name_check
= 'n';
1020 /* for backward compatibility */
1021 opts
->shortname
= VFAT_SFN_DISPLAY_WIN95
1022 | VFAT_SFN_CREATE_WIN95
;
1035 opts
->sys_immutable
= 1;
1038 if (match_int(&args
[0], &option
))
1040 opts
->fs_uid
= option
;
1043 if (match_int(&args
[0], &option
))
1045 opts
->fs_gid
= option
;
1048 if (match_octal(&args
[0], &option
))
1050 opts
->fs_fmask
= opts
->fs_dmask
= option
;
1053 if (match_octal(&args
[0], &option
))
1055 opts
->fs_dmask
= option
;
1058 if (match_octal(&args
[0], &option
))
1060 opts
->fs_fmask
= option
;
1062 case Opt_allow_utime
:
1063 if (match_octal(&args
[0], &option
))
1065 opts
->allow_utime
= option
& (S_IWGRP
| S_IWOTH
);
1068 if (match_int(&args
[0], &option
))
1070 opts
->codepage
= option
;
1079 opts
->errors
= FAT_ERRORS_CONT
;
1082 opts
->errors
= FAT_ERRORS_PANIC
;
1085 opts
->errors
= FAT_ERRORS_RO
;
1088 /* msdos specific */
1098 if (opts
->iocharset
!= fat_default_iocharset
)
1099 kfree(opts
->iocharset
);
1100 iocharset
= match_strdup(&args
[0]);
1103 opts
->iocharset
= iocharset
;
1105 case Opt_shortname_lower
:
1106 opts
->shortname
= VFAT_SFN_DISPLAY_LOWER
1107 | VFAT_SFN_CREATE_WIN95
;
1109 case Opt_shortname_win95
:
1110 opts
->shortname
= VFAT_SFN_DISPLAY_WIN95
1111 | VFAT_SFN_CREATE_WIN95
;
1113 case Opt_shortname_winnt
:
1114 opts
->shortname
= VFAT_SFN_DISPLAY_WINNT
1115 | VFAT_SFN_CREATE_WINNT
;
1117 case Opt_shortname_mixed
:
1118 opts
->shortname
= VFAT_SFN_DISPLAY_WINNT
1119 | VFAT_SFN_CREATE_WIN95
;
1121 case Opt_utf8_no
: /* 0 or no or false */
1124 case Opt_utf8_yes
: /* empty or 1 or yes or true */
1127 case Opt_uni_xl_no
: /* 0 or no or false */
1128 opts
->unicode_xlate
= 0;
1130 case Opt_uni_xl_yes
: /* empty or 1 or yes or true */
1131 opts
->unicode_xlate
= 1;
1133 case Opt_nonumtail_no
: /* 0 or no or false */
1134 opts
->numtail
= 1; /* negated option */
1136 case Opt_nonumtail_yes
: /* empty or 1 or yes or true */
1137 opts
->numtail
= 0; /* negated option */
1146 /* obsolete mount options */
1148 fat_msg(sb
, KERN_INFO
, "\"%s\" option is obsolete, "
1149 "not supported now", p
);
1151 /* unknown option */
1154 fat_msg(sb
, KERN_ERR
,
1155 "Unrecognized mount option \"%s\" "
1156 "or missing value", p
);
1163 /* UTF-8 doesn't provide FAT semantics */
1164 if (!strcmp(opts
->iocharset
, "utf8")) {
1165 fat_msg(sb
, KERN_WARNING
, "utf8 is not a recommended IO charset"
1166 " for FAT filesystems, filesystem will be "
1170 /* If user doesn't specify allow_utime, it's initialized from dmask. */
1171 if (opts
->allow_utime
== (unsigned short)-1)
1172 opts
->allow_utime
= ~opts
->fs_dmask
& (S_IWGRP
| S_IWOTH
);
1173 if (opts
->unicode_xlate
)
1179 static int fat_read_root(struct inode
*inode
)
1181 struct super_block
*sb
= inode
->i_sb
;
1182 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
1185 MSDOS_I(inode
)->i_pos
= 0;
1186 inode
->i_uid
= sbi
->options
.fs_uid
;
1187 inode
->i_gid
= sbi
->options
.fs_gid
;
1189 inode
->i_generation
= 0;
1190 inode
->i_mode
= fat_make_mode(sbi
, ATTR_DIR
, S_IRWXUGO
);
1191 inode
->i_op
= sbi
->dir_ops
;
1192 inode
->i_fop
= &fat_dir_operations
;
1193 if (sbi
->fat_bits
== 32) {
1194 MSDOS_I(inode
)->i_start
= sbi
->root_cluster
;
1195 error
= fat_calc_dir_size(inode
);
1199 MSDOS_I(inode
)->i_start
= 0;
1200 inode
->i_size
= sbi
->dir_entries
* sizeof(struct msdos_dir_entry
);
1202 inode
->i_blocks
= ((inode
->i_size
+ (sbi
->cluster_size
- 1))
1203 & ~((loff_t
)sbi
->cluster_size
- 1)) >> 9;
1204 MSDOS_I(inode
)->i_logstart
= 0;
1205 MSDOS_I(inode
)->mmu_private
= inode
->i_size
;
1207 fat_save_attrs(inode
, ATTR_DIR
);
1208 inode
->i_mtime
.tv_sec
= inode
->i_atime
.tv_sec
= inode
->i_ctime
.tv_sec
= 0;
1209 inode
->i_mtime
.tv_nsec
= inode
->i_atime
.tv_nsec
= inode
->i_ctime
.tv_nsec
= 0;
1210 set_nlink(inode
, fat_subdirs(inode
)+2);
1216 * Read the super block of an MS-DOS FS.
1218 int fat_fill_super(struct super_block
*sb
, void *data
, int silent
, int isvfat
,
1219 void (*setup
)(struct super_block
*))
1221 struct inode
*root_inode
= NULL
, *fat_inode
= NULL
;
1222 struct inode
*fsinfo_inode
= NULL
;
1223 struct buffer_head
*bh
;
1224 struct fat_boot_sector
*b
;
1225 struct msdos_sb_info
*sbi
;
1226 u16 logical_sector_size
;
1227 u32 total_sectors
, total_clusters
, fat_clusters
, rootdir_sectors
;
1234 * GFP_KERNEL is ok here, because while we do hold the
1235 * supeblock lock, memory pressure can't call back into
1236 * the filesystem, since we're only just about to mount
1237 * it and have no inodes etc active!
1239 sbi
= kzalloc(sizeof(struct msdos_sb_info
), GFP_KERNEL
);
1242 sb
->s_fs_info
= sbi
;
1244 sb
->s_flags
|= MS_NODIRATIME
;
1245 sb
->s_magic
= MSDOS_SUPER_MAGIC
;
1246 sb
->s_op
= &fat_sops
;
1247 sb
->s_export_op
= &fat_export_ops
;
1248 ratelimit_state_init(&sbi
->ratelimit
, DEFAULT_RATELIMIT_INTERVAL
,
1249 DEFAULT_RATELIMIT_BURST
);
1251 error
= parse_options(sb
, data
, isvfat
, silent
, &debug
, &sbi
->options
);
1255 setup(sb
); /* flavour-specific stuff that needs options */
1258 sb_min_blocksize(sb
, 512);
1259 bh
= sb_bread(sb
, 0);
1261 fat_msg(sb
, KERN_ERR
, "unable to read boot sector");
1265 b
= (struct fat_boot_sector
*) bh
->b_data
;
1268 fat_msg(sb
, KERN_ERR
, "bogus number of reserved sectors");
1274 fat_msg(sb
, KERN_ERR
, "bogus number of FAT structure");
1280 * Earlier we checked here that b->secs_track and b->head are nonzero,
1281 * but it turns out valid FAT filesystems can have zero there.
1285 if (!fat_valid_media(media
)) {
1287 fat_msg(sb
, KERN_ERR
, "invalid media value (0x%02x)",
1292 logical_sector_size
= get_unaligned_le16(&b
->sector_size
);
1293 if (!is_power_of_2(logical_sector_size
)
1294 || (logical_sector_size
< 512)
1295 || (logical_sector_size
> 4096)) {
1297 fat_msg(sb
, KERN_ERR
, "bogus logical sector size %u",
1298 logical_sector_size
);
1302 sbi
->sec_per_clus
= b
->sec_per_clus
;
1303 if (!is_power_of_2(sbi
->sec_per_clus
)) {
1305 fat_msg(sb
, KERN_ERR
, "bogus sectors per cluster %u",
1311 if (logical_sector_size
< sb
->s_blocksize
) {
1312 fat_msg(sb
, KERN_ERR
, "logical sector size too small for device"
1313 " (logical sector size = %u)", logical_sector_size
);
1317 if (logical_sector_size
> sb
->s_blocksize
) {
1320 if (!sb_set_blocksize(sb
, logical_sector_size
)) {
1321 fat_msg(sb
, KERN_ERR
, "unable to set blocksize %u",
1322 logical_sector_size
);
1325 bh
= sb_bread(sb
, 0);
1327 fat_msg(sb
, KERN_ERR
, "unable to read boot sector"
1328 " (logical sector size = %lu)",
1332 b
= (struct fat_boot_sector
*) bh
->b_data
;
1335 sbi
->cluster_size
= sb
->s_blocksize
* sbi
->sec_per_clus
;
1336 sbi
->cluster_bits
= ffs(sbi
->cluster_size
) - 1;
1337 sbi
->fats
= b
->fats
;
1338 sbi
->fat_bits
= 0; /* Don't know yet */
1339 sbi
->fat_start
= le16_to_cpu(b
->reserved
);
1340 sbi
->fat_length
= le16_to_cpu(b
->fat_length
);
1341 sbi
->root_cluster
= 0;
1342 sbi
->free_clusters
= -1; /* Don't know yet */
1343 sbi
->free_clus_valid
= 0;
1344 sbi
->prev_free
= FAT_START_ENT
;
1345 sb
->s_maxbytes
= 0xffffffff;
1347 if (!sbi
->fat_length
&& b
->fat32_length
) {
1348 struct fat_boot_fsinfo
*fsinfo
;
1349 struct buffer_head
*fsinfo_bh
;
1353 sbi
->fat_length
= le32_to_cpu(b
->fat32_length
);
1354 sbi
->root_cluster
= le32_to_cpu(b
->root_cluster
);
1356 /* MC - if info_sector is 0, don't multiply by 0 */
1357 sbi
->fsinfo_sector
= le16_to_cpu(b
->info_sector
);
1358 if (sbi
->fsinfo_sector
== 0)
1359 sbi
->fsinfo_sector
= 1;
1361 fsinfo_bh
= sb_bread(sb
, sbi
->fsinfo_sector
);
1362 if (fsinfo_bh
== NULL
) {
1363 fat_msg(sb
, KERN_ERR
, "bread failed, FSINFO block"
1364 " (sector = %lu)", sbi
->fsinfo_sector
);
1369 fsinfo
= (struct fat_boot_fsinfo
*)fsinfo_bh
->b_data
;
1370 if (!IS_FSINFO(fsinfo
)) {
1371 fat_msg(sb
, KERN_WARNING
, "Invalid FSINFO signature: "
1372 "0x%08x, 0x%08x (sector = %lu)",
1373 le32_to_cpu(fsinfo
->signature1
),
1374 le32_to_cpu(fsinfo
->signature2
),
1375 sbi
->fsinfo_sector
);
1377 if (sbi
->options
.usefree
)
1378 sbi
->free_clus_valid
= 1;
1379 sbi
->free_clusters
= le32_to_cpu(fsinfo
->free_clusters
);
1380 sbi
->prev_free
= le32_to_cpu(fsinfo
->next_cluster
);
1386 sbi
->dir_per_block
= sb
->s_blocksize
/ sizeof(struct msdos_dir_entry
);
1387 sbi
->dir_per_block_bits
= ffs(sbi
->dir_per_block
) - 1;
1389 sbi
->dir_start
= sbi
->fat_start
+ sbi
->fats
* sbi
->fat_length
;
1390 sbi
->dir_entries
= get_unaligned_le16(&b
->dir_entries
);
1391 if (sbi
->dir_entries
& (sbi
->dir_per_block
- 1)) {
1393 fat_msg(sb
, KERN_ERR
, "bogus directroy-entries per block"
1394 " (%u)", sbi
->dir_entries
);
1399 rootdir_sectors
= sbi
->dir_entries
1400 * sizeof(struct msdos_dir_entry
) / sb
->s_blocksize
;
1401 sbi
->data_start
= sbi
->dir_start
+ rootdir_sectors
;
1402 total_sectors
= get_unaligned_le16(&b
->sectors
);
1403 if (total_sectors
== 0)
1404 total_sectors
= le32_to_cpu(b
->total_sect
);
1406 total_clusters
= (total_sectors
- sbi
->data_start
) / sbi
->sec_per_clus
;
1408 if (sbi
->fat_bits
!= 32)
1409 sbi
->fat_bits
= (total_clusters
> MAX_FAT12
) ? 16 : 12;
1411 /* check that FAT table does not overflow */
1412 fat_clusters
= sbi
->fat_length
* sb
->s_blocksize
* 8 / sbi
->fat_bits
;
1413 total_clusters
= min(total_clusters
, fat_clusters
- FAT_START_ENT
);
1414 if (total_clusters
> MAX_FAT(sb
)) {
1416 fat_msg(sb
, KERN_ERR
, "count of clusters too big (%u)",
1422 sbi
->max_cluster
= total_clusters
+ FAT_START_ENT
;
1423 /* check the free_clusters, it's not necessarily correct */
1424 if (sbi
->free_clusters
!= -1 && sbi
->free_clusters
> total_clusters
)
1425 sbi
->free_clusters
= -1;
1426 /* check the prev_free, it's not necessarily correct */
1427 sbi
->prev_free
%= sbi
->max_cluster
;
1428 if (sbi
->prev_free
< FAT_START_ENT
)
1429 sbi
->prev_free
= FAT_START_ENT
;
1433 /* set up enough so that it can read an inode */
1435 fat_ent_access_init(sb
);
1438 * The low byte of FAT's first entry must have same value with
1439 * media-field. But in real world, too many devices is
1440 * writing wrong value. So, removed that validity check.
1442 * if (FAT_FIRST_ENT(sb, media) != first)
1446 sprintf(buf
, "cp%d", sbi
->options
.codepage
);
1447 sbi
->nls_disk
= load_nls(buf
);
1448 if (!sbi
->nls_disk
) {
1449 fat_msg(sb
, KERN_ERR
, "codepage %s not found", buf
);
1453 /* FIXME: utf8 is using iocharset for upper/lower conversion */
1454 if (sbi
->options
.isvfat
) {
1455 sbi
->nls_io
= load_nls(sbi
->options
.iocharset
);
1457 fat_msg(sb
, KERN_ERR
, "IO charset %s not found",
1458 sbi
->options
.iocharset
);
1464 fat_inode
= new_inode(sb
);
1467 MSDOS_I(fat_inode
)->i_pos
= 0;
1468 sbi
->fat_inode
= fat_inode
;
1470 fsinfo_inode
= new_inode(sb
);
1473 fsinfo_inode
->i_ino
= MSDOS_FSINFO_INO
;
1474 sbi
->fsinfo_inode
= fsinfo_inode
;
1475 insert_inode_hash(fsinfo_inode
);
1477 root_inode
= new_inode(sb
);
1480 root_inode
->i_ino
= MSDOS_ROOT_INO
;
1481 root_inode
->i_version
= 1;
1482 error
= fat_read_root(root_inode
);
1488 insert_inode_hash(root_inode
);
1489 sb
->s_root
= d_make_root(root_inode
);
1491 fat_msg(sb
, KERN_ERR
, "get root inode failed");
1500 fat_msg(sb
, KERN_INFO
, "Can't find a valid FAT filesystem");
1507 unload_nls(sbi
->nls_io
);
1508 unload_nls(sbi
->nls_disk
);
1509 if (sbi
->options
.iocharset
!= fat_default_iocharset
)
1510 kfree(sbi
->options
.iocharset
);
1511 sb
->s_fs_info
= NULL
;
1516 EXPORT_SYMBOL_GPL(fat_fill_super
);
1519 * helper function for fat_flush_inodes. This writes both the inode
1520 * and the file data blocks, waiting for in flight data blocks before
1521 * the start of the call. It does not wait for any io started
1524 static int writeback_inode(struct inode
*inode
)
1528 struct address_space
*mapping
= inode
->i_mapping
;
1529 struct writeback_control wbc
= {
1530 .sync_mode
= WB_SYNC_NONE
,
1533 /* if we used WB_SYNC_ALL, sync_inode waits for the io for the
1534 * inode to finish. So WB_SYNC_NONE is sent down to sync_inode
1535 * and filemap_fdatawrite is used for the data blocks
1537 ret
= sync_inode(inode
, &wbc
);
1539 ret
= filemap_fdatawrite(mapping
);
1544 * write data and metadata corresponding to i1 and i2. The io is
1545 * started but we do not wait for any of it to finish.
1547 * filemap_flush is used for the block device, so if there is a dirty
1548 * page for a block already in flight, we will not wait and start the
1551 int fat_flush_inodes(struct super_block
*sb
, struct inode
*i1
, struct inode
*i2
)
1554 if (!MSDOS_SB(sb
)->options
.flush
)
1557 ret
= writeback_inode(i1
);
1559 ret
= writeback_inode(i2
);
1561 struct address_space
*mapping
= sb
->s_bdev
->bd_inode
->i_mapping
;
1562 ret
= filemap_flush(mapping
);
1566 EXPORT_SYMBOL_GPL(fat_flush_inodes
);
1568 static int __init
init_fat_fs(void)
1572 err
= fat_cache_init();
1576 err
= fat_init_inodecache();
1583 fat_cache_destroy();
1587 static void __exit
exit_fat_fs(void)
1589 fat_cache_destroy();
1590 fat_destroy_inodecache();
1593 module_init(init_fat_fs
)
1594 module_exit(exit_fat_fs
)
1596 MODULE_LICENSE("GPL");