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 static void dir_hash_init(struct super_block
*sb
)
286 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
289 spin_lock_init(&sbi
->dir_hash_lock
);
290 for (i
= 0; i
< FAT_HASH_SIZE
; i
++)
291 INIT_HLIST_HEAD(&sbi
->dir_hashtable
[i
]);
294 void fat_attach(struct inode
*inode
, loff_t i_pos
)
296 struct msdos_sb_info
*sbi
= MSDOS_SB(inode
->i_sb
);
298 if (inode
->i_ino
!= MSDOS_ROOT_INO
) {
299 struct hlist_head
*head
= sbi
->inode_hashtable
302 spin_lock(&sbi
->inode_hash_lock
);
303 MSDOS_I(inode
)->i_pos
= i_pos
;
304 hlist_add_head(&MSDOS_I(inode
)->i_fat_hash
, head
);
305 spin_unlock(&sbi
->inode_hash_lock
);
308 /* If NFS support is enabled, cache the mapping of start cluster
309 * to directory inode. This is used during reconnection of
310 * dentries to the filesystem root.
312 if (S_ISDIR(inode
->i_mode
) && sbi
->options
.nfs
) {
313 struct hlist_head
*d_head
= sbi
->dir_hashtable
;
314 d_head
+= fat_dir_hash(MSDOS_I(inode
)->i_logstart
);
316 spin_lock(&sbi
->dir_hash_lock
);
317 hlist_add_head(&MSDOS_I(inode
)->i_dir_hash
, d_head
);
318 spin_unlock(&sbi
->dir_hash_lock
);
321 EXPORT_SYMBOL_GPL(fat_attach
);
323 void fat_detach(struct inode
*inode
)
325 struct msdos_sb_info
*sbi
= MSDOS_SB(inode
->i_sb
);
326 spin_lock(&sbi
->inode_hash_lock
);
327 MSDOS_I(inode
)->i_pos
= 0;
328 hlist_del_init(&MSDOS_I(inode
)->i_fat_hash
);
329 spin_unlock(&sbi
->inode_hash_lock
);
331 if (S_ISDIR(inode
->i_mode
) && sbi
->options
.nfs
) {
332 spin_lock(&sbi
->dir_hash_lock
);
333 hlist_del_init(&MSDOS_I(inode
)->i_dir_hash
);
334 spin_unlock(&sbi
->dir_hash_lock
);
337 EXPORT_SYMBOL_GPL(fat_detach
);
339 struct inode
*fat_iget(struct super_block
*sb
, loff_t i_pos
)
341 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
342 struct hlist_head
*head
= sbi
->inode_hashtable
+ fat_hash(i_pos
);
343 struct hlist_node
*_p
;
344 struct msdos_inode_info
*i
;
345 struct inode
*inode
= NULL
;
347 spin_lock(&sbi
->inode_hash_lock
);
348 hlist_for_each_entry(i
, _p
, head
, i_fat_hash
) {
349 BUG_ON(i
->vfs_inode
.i_sb
!= sb
);
350 if (i
->i_pos
!= i_pos
)
352 inode
= igrab(&i
->vfs_inode
);
356 spin_unlock(&sbi
->inode_hash_lock
);
360 static int is_exec(unsigned char *extension
)
362 unsigned char *exe_extensions
= "EXECOMBAT", *walk
;
364 for (walk
= exe_extensions
; *walk
; walk
+= 3)
365 if (!strncmp(extension
, walk
, 3))
370 static int fat_calc_dir_size(struct inode
*inode
)
372 struct msdos_sb_info
*sbi
= MSDOS_SB(inode
->i_sb
);
373 int ret
, fclus
, dclus
;
376 if (MSDOS_I(inode
)->i_start
== 0)
379 ret
= fat_get_cluster(inode
, FAT_ENT_EOF
, &fclus
, &dclus
);
382 inode
->i_size
= (fclus
+ 1) << sbi
->cluster_bits
;
387 /* doesn't deal with root inode */
388 static int fat_fill_inode(struct inode
*inode
, struct msdos_dir_entry
*de
)
390 struct msdos_sb_info
*sbi
= MSDOS_SB(inode
->i_sb
);
393 MSDOS_I(inode
)->i_pos
= 0;
394 inode
->i_uid
= sbi
->options
.fs_uid
;
395 inode
->i_gid
= sbi
->options
.fs_gid
;
397 inode
->i_generation
= get_seconds();
399 if ((de
->attr
& ATTR_DIR
) && !IS_FREE(de
->name
)) {
400 inode
->i_generation
&= ~1;
401 inode
->i_mode
= fat_make_mode(sbi
, de
->attr
, S_IRWXUGO
);
402 inode
->i_op
= sbi
->dir_ops
;
403 inode
->i_fop
= &fat_dir_operations
;
405 MSDOS_I(inode
)->i_start
= fat_get_start(sbi
, de
);
406 MSDOS_I(inode
)->i_logstart
= MSDOS_I(inode
)->i_start
;
407 error
= fat_calc_dir_size(inode
);
410 MSDOS_I(inode
)->mmu_private
= inode
->i_size
;
412 set_nlink(inode
, fat_subdirs(inode
));
413 } else { /* not a directory */
414 inode
->i_generation
|= 1;
415 inode
->i_mode
= fat_make_mode(sbi
, de
->attr
,
416 ((sbi
->options
.showexec
&& !is_exec(de
->name
+ 8))
417 ? S_IRUGO
|S_IWUGO
: S_IRWXUGO
));
418 MSDOS_I(inode
)->i_start
= fat_get_start(sbi
, de
);
420 MSDOS_I(inode
)->i_logstart
= MSDOS_I(inode
)->i_start
;
421 inode
->i_size
= le32_to_cpu(de
->size
);
422 inode
->i_op
= &fat_file_inode_operations
;
423 inode
->i_fop
= &fat_file_operations
;
424 inode
->i_mapping
->a_ops
= &fat_aops
;
425 MSDOS_I(inode
)->mmu_private
= inode
->i_size
;
427 if (de
->attr
& ATTR_SYS
) {
428 if (sbi
->options
.sys_immutable
)
429 inode
->i_flags
|= S_IMMUTABLE
;
431 fat_save_attrs(inode
, de
->attr
);
433 inode
->i_blocks
= ((inode
->i_size
+ (sbi
->cluster_size
- 1))
434 & ~((loff_t
)sbi
->cluster_size
- 1)) >> 9;
436 fat_time_fat2unix(sbi
, &inode
->i_mtime
, de
->time
, de
->date
, 0);
437 if (sbi
->options
.isvfat
) {
438 fat_time_fat2unix(sbi
, &inode
->i_ctime
, de
->ctime
,
439 de
->cdate
, de
->ctime_cs
);
440 fat_time_fat2unix(sbi
, &inode
->i_atime
, 0, de
->adate
, 0);
442 inode
->i_ctime
= inode
->i_atime
= inode
->i_mtime
;
447 struct inode
*fat_build_inode(struct super_block
*sb
,
448 struct msdos_dir_entry
*de
, loff_t i_pos
)
453 inode
= fat_iget(sb
, i_pos
);
456 inode
= new_inode(sb
);
458 inode
= ERR_PTR(-ENOMEM
);
461 inode
->i_ino
= iunique(sb
, MSDOS_ROOT_INO
);
462 inode
->i_version
= 1;
463 err
= fat_fill_inode(inode
, de
);
466 inode
= ERR_PTR(err
);
469 fat_attach(inode
, i_pos
);
470 insert_inode_hash(inode
);
475 EXPORT_SYMBOL_GPL(fat_build_inode
);
477 static void fat_evict_inode(struct inode
*inode
)
479 truncate_inode_pages(&inode
->i_data
, 0);
480 if (!inode
->i_nlink
) {
482 fat_truncate_blocks(inode
, 0);
484 invalidate_inode_buffers(inode
);
486 fat_cache_inval_inode(inode
);
490 static void fat_put_super(struct super_block
*sb
)
492 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
494 iput(sbi
->fsinfo_inode
);
495 iput(sbi
->fat_inode
);
497 unload_nls(sbi
->nls_disk
);
498 unload_nls(sbi
->nls_io
);
500 if (sbi
->options
.iocharset
!= fat_default_iocharset
)
501 kfree(sbi
->options
.iocharset
);
503 sb
->s_fs_info
= NULL
;
507 static struct kmem_cache
*fat_inode_cachep
;
509 static struct inode
*fat_alloc_inode(struct super_block
*sb
)
511 struct msdos_inode_info
*ei
;
512 ei
= kmem_cache_alloc(fat_inode_cachep
, GFP_NOFS
);
516 init_rwsem(&ei
->truncate_lock
);
517 return &ei
->vfs_inode
;
520 static void fat_i_callback(struct rcu_head
*head
)
522 struct inode
*inode
= container_of(head
, struct inode
, i_rcu
);
523 kmem_cache_free(fat_inode_cachep
, MSDOS_I(inode
));
526 static void fat_destroy_inode(struct inode
*inode
)
528 call_rcu(&inode
->i_rcu
, fat_i_callback
);
531 static void init_once(void *foo
)
533 struct msdos_inode_info
*ei
= (struct msdos_inode_info
*)foo
;
535 spin_lock_init(&ei
->cache_lru_lock
);
537 ei
->cache_valid_id
= FAT_CACHE_VALID
+ 1;
538 INIT_LIST_HEAD(&ei
->cache_lru
);
539 INIT_HLIST_NODE(&ei
->i_fat_hash
);
540 INIT_HLIST_NODE(&ei
->i_dir_hash
);
541 inode_init_once(&ei
->vfs_inode
);
544 static int __init
fat_init_inodecache(void)
546 fat_inode_cachep
= kmem_cache_create("fat_inode_cache",
547 sizeof(struct msdos_inode_info
),
548 0, (SLAB_RECLAIM_ACCOUNT
|
551 if (fat_inode_cachep
== NULL
)
556 static void __exit
fat_destroy_inodecache(void)
559 * Make sure all delayed rcu free inodes are flushed before we
563 kmem_cache_destroy(fat_inode_cachep
);
566 static int fat_remount(struct super_block
*sb
, int *flags
, char *data
)
568 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
569 *flags
|= MS_NODIRATIME
| (sbi
->options
.isvfat
? 0 : MS_NOATIME
);
573 static int fat_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
575 struct super_block
*sb
= dentry
->d_sb
;
576 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
577 u64 id
= huge_encode_dev(sb
->s_bdev
->bd_dev
);
579 /* If the count of free cluster is still unknown, counts it here. */
580 if (sbi
->free_clusters
== -1 || !sbi
->free_clus_valid
) {
581 int err
= fat_count_free_clusters(dentry
->d_sb
);
586 buf
->f_type
= dentry
->d_sb
->s_magic
;
587 buf
->f_bsize
= sbi
->cluster_size
;
588 buf
->f_blocks
= sbi
->max_cluster
- FAT_START_ENT
;
589 buf
->f_bfree
= sbi
->free_clusters
;
590 buf
->f_bavail
= sbi
->free_clusters
;
591 buf
->f_fsid
.val
[0] = (u32
)id
;
592 buf
->f_fsid
.val
[1] = (u32
)(id
>> 32);
594 (sbi
->options
.isvfat
? FAT_LFN_LEN
: 12) * NLS_MAX_CHARSET_SIZE
;
599 static inline loff_t
fat_i_pos_read(struct msdos_sb_info
*sbi
,
603 #if BITS_PER_LONG == 32
604 spin_lock(&sbi
->inode_hash_lock
);
606 i_pos
= MSDOS_I(inode
)->i_pos
;
607 #if BITS_PER_LONG == 32
608 spin_unlock(&sbi
->inode_hash_lock
);
613 static int __fat_write_inode(struct inode
*inode
, int wait
)
615 struct super_block
*sb
= inode
->i_sb
;
616 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
617 struct buffer_head
*bh
;
618 struct msdos_dir_entry
*raw_entry
;
622 if (inode
->i_ino
== MSDOS_ROOT_INO
)
626 i_pos
= fat_i_pos_read(sbi
, inode
);
630 bh
= sb_bread(sb
, i_pos
>> sbi
->dir_per_block_bits
);
632 fat_msg(sb
, KERN_ERR
, "unable to read inode block "
633 "for updating (i_pos %lld)", i_pos
);
636 spin_lock(&sbi
->inode_hash_lock
);
637 if (i_pos
!= MSDOS_I(inode
)->i_pos
) {
638 spin_unlock(&sbi
->inode_hash_lock
);
643 raw_entry
= &((struct msdos_dir_entry
*) (bh
->b_data
))
644 [i_pos
& (sbi
->dir_per_block
- 1)];
645 if (S_ISDIR(inode
->i_mode
))
648 raw_entry
->size
= cpu_to_le32(inode
->i_size
);
649 raw_entry
->attr
= fat_make_attrs(inode
);
650 fat_set_start(raw_entry
, MSDOS_I(inode
)->i_logstart
);
651 fat_time_unix2fat(sbi
, &inode
->i_mtime
, &raw_entry
->time
,
652 &raw_entry
->date
, NULL
);
653 if (sbi
->options
.isvfat
) {
655 fat_time_unix2fat(sbi
, &inode
->i_ctime
, &raw_entry
->ctime
,
656 &raw_entry
->cdate
, &raw_entry
->ctime_cs
);
657 fat_time_unix2fat(sbi
, &inode
->i_atime
, &atime
,
658 &raw_entry
->adate
, NULL
);
660 spin_unlock(&sbi
->inode_hash_lock
);
661 mark_buffer_dirty(bh
);
664 err
= sync_dirty_buffer(bh
);
669 static int fat_write_inode(struct inode
*inode
, struct writeback_control
*wbc
)
673 if (inode
->i_ino
== MSDOS_FSINFO_INO
) {
674 struct super_block
*sb
= inode
->i_sb
;
677 err
= fat_clusters_flush(sb
);
680 err
= __fat_write_inode(inode
, wbc
->sync_mode
== WB_SYNC_ALL
);
685 int fat_sync_inode(struct inode
*inode
)
687 return __fat_write_inode(inode
, 1);
690 EXPORT_SYMBOL_GPL(fat_sync_inode
);
692 static int fat_show_options(struct seq_file
*m
, struct dentry
*root
);
693 static const struct super_operations fat_sops
= {
694 .alloc_inode
= fat_alloc_inode
,
695 .destroy_inode
= fat_destroy_inode
,
696 .write_inode
= fat_write_inode
,
697 .evict_inode
= fat_evict_inode
,
698 .put_super
= fat_put_super
,
699 .statfs
= fat_statfs
,
700 .remount_fs
= fat_remount
,
702 .show_options
= fat_show_options
,
705 static const struct export_operations fat_export_ops
= {
706 .fh_to_dentry
= fat_fh_to_dentry
,
707 .fh_to_parent
= fat_fh_to_parent
,
708 .get_parent
= fat_get_parent
,
711 static int fat_show_options(struct seq_file
*m
, struct dentry
*root
)
713 struct msdos_sb_info
*sbi
= MSDOS_SB(root
->d_sb
);
714 struct fat_mount_options
*opts
= &sbi
->options
;
715 int isvfat
= opts
->isvfat
;
717 if (!uid_eq(opts
->fs_uid
, GLOBAL_ROOT_UID
))
718 seq_printf(m
, ",uid=%u",
719 from_kuid_munged(&init_user_ns
, opts
->fs_uid
));
720 if (!gid_eq(opts
->fs_gid
, GLOBAL_ROOT_GID
))
721 seq_printf(m
, ",gid=%u",
722 from_kgid_munged(&init_user_ns
, opts
->fs_gid
));
723 seq_printf(m
, ",fmask=%04o", opts
->fs_fmask
);
724 seq_printf(m
, ",dmask=%04o", opts
->fs_dmask
);
725 if (opts
->allow_utime
)
726 seq_printf(m
, ",allow_utime=%04o", opts
->allow_utime
);
728 seq_printf(m
, ",codepage=%s", sbi
->nls_disk
->charset
);
731 seq_printf(m
, ",iocharset=%s", sbi
->nls_io
->charset
);
733 switch (opts
->shortname
) {
734 case VFAT_SFN_DISPLAY_WIN95
| VFAT_SFN_CREATE_WIN95
:
735 seq_puts(m
, ",shortname=win95");
737 case VFAT_SFN_DISPLAY_WINNT
| VFAT_SFN_CREATE_WINNT
:
738 seq_puts(m
, ",shortname=winnt");
740 case VFAT_SFN_DISPLAY_WINNT
| VFAT_SFN_CREATE_WIN95
:
741 seq_puts(m
, ",shortname=mixed");
743 case VFAT_SFN_DISPLAY_LOWER
| VFAT_SFN_CREATE_WIN95
:
744 seq_puts(m
, ",shortname=lower");
747 seq_puts(m
, ",shortname=unknown");
751 if (opts
->name_check
!= 'n')
752 seq_printf(m
, ",check=%c", opts
->name_check
);
754 seq_puts(m
, ",usefree");
756 seq_puts(m
, ",quiet");
760 seq_puts(m
, ",showexec");
761 if (opts
->sys_immutable
)
762 seq_puts(m
, ",sys_immutable");
765 seq_puts(m
, ",dotsOK=yes");
767 seq_puts(m
, ",nocase");
770 seq_puts(m
, ",utf8");
771 if (opts
->unicode_xlate
)
772 seq_puts(m
, ",uni_xlate");
774 seq_puts(m
, ",nonumtail");
776 seq_puts(m
, ",rodir");
779 seq_puts(m
, ",flush");
781 seq_puts(m
, ",tz=UTC");
782 if (opts
->errors
== FAT_ERRORS_CONT
)
783 seq_puts(m
, ",errors=continue");
784 else if (opts
->errors
== FAT_ERRORS_PANIC
)
785 seq_puts(m
, ",errors=panic");
787 seq_puts(m
, ",errors=remount-ro");
789 seq_puts(m
, ",discard");
795 Opt_check_n
, Opt_check_r
, Opt_check_s
, Opt_uid
, Opt_gid
,
796 Opt_umask
, Opt_dmask
, Opt_fmask
, Opt_allow_utime
, Opt_codepage
,
797 Opt_usefree
, Opt_nocase
, Opt_quiet
, Opt_showexec
, Opt_debug
,
798 Opt_immutable
, Opt_dots
, Opt_nodots
,
799 Opt_charset
, Opt_shortname_lower
, Opt_shortname_win95
,
800 Opt_shortname_winnt
, Opt_shortname_mixed
, Opt_utf8_no
, Opt_utf8_yes
,
801 Opt_uni_xl_no
, Opt_uni_xl_yes
, Opt_nonumtail_no
, Opt_nonumtail_yes
,
802 Opt_obsolete
, Opt_flush
, Opt_tz_utc
, Opt_rodir
, Opt_err_cont
,
803 Opt_err_panic
, Opt_err_ro
, Opt_discard
, Opt_nfs
, Opt_err
,
806 static const match_table_t fat_tokens
= {
807 {Opt_check_r
, "check=relaxed"},
808 {Opt_check_s
, "check=strict"},
809 {Opt_check_n
, "check=normal"},
810 {Opt_check_r
, "check=r"},
811 {Opt_check_s
, "check=s"},
812 {Opt_check_n
, "check=n"},
815 {Opt_umask
, "umask=%o"},
816 {Opt_dmask
, "dmask=%o"},
817 {Opt_fmask
, "fmask=%o"},
818 {Opt_allow_utime
, "allow_utime=%o"},
819 {Opt_codepage
, "codepage=%u"},
820 {Opt_usefree
, "usefree"},
821 {Opt_nocase
, "nocase"},
822 {Opt_quiet
, "quiet"},
823 {Opt_showexec
, "showexec"},
824 {Opt_debug
, "debug"},
825 {Opt_immutable
, "sys_immutable"},
826 {Opt_flush
, "flush"},
827 {Opt_tz_utc
, "tz=UTC"},
828 {Opt_err_cont
, "errors=continue"},
829 {Opt_err_panic
, "errors=panic"},
830 {Opt_err_ro
, "errors=remount-ro"},
831 {Opt_discard
, "discard"},
833 {Opt_obsolete
, "conv=binary"},
834 {Opt_obsolete
, "conv=text"},
835 {Opt_obsolete
, "conv=auto"},
836 {Opt_obsolete
, "conv=b"},
837 {Opt_obsolete
, "conv=t"},
838 {Opt_obsolete
, "conv=a"},
839 {Opt_obsolete
, "fat=%u"},
840 {Opt_obsolete
, "blocksize=%u"},
841 {Opt_obsolete
, "cvf_format=%20s"},
842 {Opt_obsolete
, "cvf_options=%100s"},
843 {Opt_obsolete
, "posix"},
846 static const match_table_t msdos_tokens
= {
847 {Opt_nodots
, "nodots"},
848 {Opt_nodots
, "dotsOK=no"},
850 {Opt_dots
, "dotsOK=yes"},
853 static const match_table_t vfat_tokens
= {
854 {Opt_charset
, "iocharset=%s"},
855 {Opt_shortname_lower
, "shortname=lower"},
856 {Opt_shortname_win95
, "shortname=win95"},
857 {Opt_shortname_winnt
, "shortname=winnt"},
858 {Opt_shortname_mixed
, "shortname=mixed"},
859 {Opt_utf8_no
, "utf8=0"}, /* 0 or no or false */
860 {Opt_utf8_no
, "utf8=no"},
861 {Opt_utf8_no
, "utf8=false"},
862 {Opt_utf8_yes
, "utf8=1"}, /* empty or 1 or yes or true */
863 {Opt_utf8_yes
, "utf8=yes"},
864 {Opt_utf8_yes
, "utf8=true"},
865 {Opt_utf8_yes
, "utf8"},
866 {Opt_uni_xl_no
, "uni_xlate=0"}, /* 0 or no or false */
867 {Opt_uni_xl_no
, "uni_xlate=no"},
868 {Opt_uni_xl_no
, "uni_xlate=false"},
869 {Opt_uni_xl_yes
, "uni_xlate=1"}, /* empty or 1 or yes or true */
870 {Opt_uni_xl_yes
, "uni_xlate=yes"},
871 {Opt_uni_xl_yes
, "uni_xlate=true"},
872 {Opt_uni_xl_yes
, "uni_xlate"},
873 {Opt_nonumtail_no
, "nonumtail=0"}, /* 0 or no or false */
874 {Opt_nonumtail_no
, "nonumtail=no"},
875 {Opt_nonumtail_no
, "nonumtail=false"},
876 {Opt_nonumtail_yes
, "nonumtail=1"}, /* empty or 1 or yes or true */
877 {Opt_nonumtail_yes
, "nonumtail=yes"},
878 {Opt_nonumtail_yes
, "nonumtail=true"},
879 {Opt_nonumtail_yes
, "nonumtail"},
880 {Opt_rodir
, "rodir"},
884 static int parse_options(struct super_block
*sb
, char *options
, int is_vfat
,
885 int silent
, int *debug
, struct fat_mount_options
*opts
)
888 substring_t args
[MAX_OPT_ARGS
];
892 opts
->isvfat
= is_vfat
;
894 opts
->fs_uid
= current_uid();
895 opts
->fs_gid
= current_gid();
896 opts
->fs_fmask
= opts
->fs_dmask
= current_umask();
897 opts
->allow_utime
= -1;
898 opts
->codepage
= fat_default_codepage
;
899 opts
->iocharset
= fat_default_iocharset
;
901 opts
->shortname
= VFAT_SFN_DISPLAY_WINNT
|VFAT_SFN_CREATE_WIN95
;
907 opts
->name_check
= 'n';
908 opts
->quiet
= opts
->showexec
= opts
->sys_immutable
= opts
->dotsOK
= 0;
909 opts
->utf8
= opts
->unicode_xlate
= 0;
911 opts
->usefree
= opts
->nocase
= 0;
914 opts
->errors
= FAT_ERRORS_RO
;
920 while ((p
= strsep(&options
, ",")) != NULL
) {
925 token
= match_token(p
, fat_tokens
, args
);
926 if (token
== Opt_err
) {
928 token
= match_token(p
, vfat_tokens
, args
);
930 token
= match_token(p
, msdos_tokens
, args
);
934 opts
->name_check
= 's';
937 opts
->name_check
= 'r';
940 opts
->name_check
= 'n';
949 /* for backward compatibility */
950 opts
->shortname
= VFAT_SFN_DISPLAY_WIN95
951 | VFAT_SFN_CREATE_WIN95
;
964 opts
->sys_immutable
= 1;
967 if (match_int(&args
[0], &option
))
969 opts
->fs_uid
= make_kuid(current_user_ns(), option
);
970 if (!uid_valid(opts
->fs_uid
))
974 if (match_int(&args
[0], &option
))
976 opts
->fs_gid
= make_kgid(current_user_ns(), option
);
977 if (!gid_valid(opts
->fs_gid
))
981 if (match_octal(&args
[0], &option
))
983 opts
->fs_fmask
= opts
->fs_dmask
= option
;
986 if (match_octal(&args
[0], &option
))
988 opts
->fs_dmask
= option
;
991 if (match_octal(&args
[0], &option
))
993 opts
->fs_fmask
= option
;
995 case Opt_allow_utime
:
996 if (match_octal(&args
[0], &option
))
998 opts
->allow_utime
= option
& (S_IWGRP
| S_IWOTH
);
1001 if (match_int(&args
[0], &option
))
1003 opts
->codepage
= option
;
1012 opts
->errors
= FAT_ERRORS_CONT
;
1015 opts
->errors
= FAT_ERRORS_PANIC
;
1018 opts
->errors
= FAT_ERRORS_RO
;
1021 /* msdos specific */
1031 if (opts
->iocharset
!= fat_default_iocharset
)
1032 kfree(opts
->iocharset
);
1033 iocharset
= match_strdup(&args
[0]);
1036 opts
->iocharset
= iocharset
;
1038 case Opt_shortname_lower
:
1039 opts
->shortname
= VFAT_SFN_DISPLAY_LOWER
1040 | VFAT_SFN_CREATE_WIN95
;
1042 case Opt_shortname_win95
:
1043 opts
->shortname
= VFAT_SFN_DISPLAY_WIN95
1044 | VFAT_SFN_CREATE_WIN95
;
1046 case Opt_shortname_winnt
:
1047 opts
->shortname
= VFAT_SFN_DISPLAY_WINNT
1048 | VFAT_SFN_CREATE_WINNT
;
1050 case Opt_shortname_mixed
:
1051 opts
->shortname
= VFAT_SFN_DISPLAY_WINNT
1052 | VFAT_SFN_CREATE_WIN95
;
1054 case Opt_utf8_no
: /* 0 or no or false */
1057 case Opt_utf8_yes
: /* empty or 1 or yes or true */
1060 case Opt_uni_xl_no
: /* 0 or no or false */
1061 opts
->unicode_xlate
= 0;
1063 case Opt_uni_xl_yes
: /* empty or 1 or yes or true */
1064 opts
->unicode_xlate
= 1;
1066 case Opt_nonumtail_no
: /* 0 or no or false */
1067 opts
->numtail
= 1; /* negated option */
1069 case Opt_nonumtail_yes
: /* empty or 1 or yes or true */
1070 opts
->numtail
= 0; /* negated option */
1082 /* obsolete mount options */
1084 fat_msg(sb
, KERN_INFO
, "\"%s\" option is obsolete, "
1085 "not supported now", p
);
1087 /* unknown option */
1090 fat_msg(sb
, KERN_ERR
,
1091 "Unrecognized mount option \"%s\" "
1092 "or missing value", p
);
1099 /* UTF-8 doesn't provide FAT semantics */
1100 if (!strcmp(opts
->iocharset
, "utf8")) {
1101 fat_msg(sb
, KERN_WARNING
, "utf8 is not a recommended IO charset"
1102 " for FAT filesystems, filesystem will be "
1106 /* If user doesn't specify allow_utime, it's initialized from dmask. */
1107 if (opts
->allow_utime
== (unsigned short)-1)
1108 opts
->allow_utime
= ~opts
->fs_dmask
& (S_IWGRP
| S_IWOTH
);
1109 if (opts
->unicode_xlate
)
1115 static int fat_read_root(struct inode
*inode
)
1117 struct super_block
*sb
= inode
->i_sb
;
1118 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
1121 MSDOS_I(inode
)->i_pos
= 0;
1122 inode
->i_uid
= sbi
->options
.fs_uid
;
1123 inode
->i_gid
= sbi
->options
.fs_gid
;
1125 inode
->i_generation
= 0;
1126 inode
->i_mode
= fat_make_mode(sbi
, ATTR_DIR
, S_IRWXUGO
);
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
);
1135 MSDOS_I(inode
)->i_start
= 0;
1136 inode
->i_size
= sbi
->dir_entries
* sizeof(struct msdos_dir_entry
);
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
;
1143 fat_save_attrs(inode
, ATTR_DIR
);
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 set_nlink(inode
, fat_subdirs(inode
)+2);
1152 * Read the super block of an MS-DOS FS.
1154 int fat_fill_super(struct super_block
*sb
, void *data
, int silent
, int isvfat
,
1155 void (*setup
)(struct super_block
*))
1157 struct inode
*root_inode
= NULL
, *fat_inode
= NULL
;
1158 struct inode
*fsinfo_inode
= NULL
;
1159 struct buffer_head
*bh
;
1160 struct fat_boot_sector
*b
;
1161 struct msdos_sb_info
*sbi
;
1162 u16 logical_sector_size
;
1163 u32 total_sectors
, total_clusters
, fat_clusters
, rootdir_sectors
;
1170 * GFP_KERNEL is ok here, because while we do hold the
1171 * supeblock lock, memory pressure can't call back into
1172 * the filesystem, since we're only just about to mount
1173 * it and have no inodes etc active!
1175 sbi
= kzalloc(sizeof(struct msdos_sb_info
), GFP_KERNEL
);
1178 sb
->s_fs_info
= sbi
;
1180 sb
->s_flags
|= MS_NODIRATIME
;
1181 sb
->s_magic
= MSDOS_SUPER_MAGIC
;
1182 sb
->s_op
= &fat_sops
;
1183 sb
->s_export_op
= &fat_export_ops
;
1184 ratelimit_state_init(&sbi
->ratelimit
, DEFAULT_RATELIMIT_INTERVAL
,
1185 DEFAULT_RATELIMIT_BURST
);
1187 error
= parse_options(sb
, data
, isvfat
, silent
, &debug
, &sbi
->options
);
1191 setup(sb
); /* flavour-specific stuff that needs options */
1194 sb_min_blocksize(sb
, 512);
1195 bh
= sb_bread(sb
, 0);
1197 fat_msg(sb
, KERN_ERR
, "unable to read boot sector");
1201 b
= (struct fat_boot_sector
*) bh
->b_data
;
1204 fat_msg(sb
, KERN_ERR
, "bogus number of reserved sectors");
1210 fat_msg(sb
, KERN_ERR
, "bogus number of FAT structure");
1216 * Earlier we checked here that b->secs_track and b->head are nonzero,
1217 * but it turns out valid FAT filesystems can have zero there.
1221 if (!fat_valid_media(media
)) {
1223 fat_msg(sb
, KERN_ERR
, "invalid media value (0x%02x)",
1228 logical_sector_size
= get_unaligned_le16(&b
->sector_size
);
1229 if (!is_power_of_2(logical_sector_size
)
1230 || (logical_sector_size
< 512)
1231 || (logical_sector_size
> 4096)) {
1233 fat_msg(sb
, KERN_ERR
, "bogus logical sector size %u",
1234 logical_sector_size
);
1238 sbi
->sec_per_clus
= b
->sec_per_clus
;
1239 if (!is_power_of_2(sbi
->sec_per_clus
)) {
1241 fat_msg(sb
, KERN_ERR
, "bogus sectors per cluster %u",
1247 if (logical_sector_size
< sb
->s_blocksize
) {
1248 fat_msg(sb
, KERN_ERR
, "logical sector size too small for device"
1249 " (logical sector size = %u)", logical_sector_size
);
1253 if (logical_sector_size
> sb
->s_blocksize
) {
1256 if (!sb_set_blocksize(sb
, logical_sector_size
)) {
1257 fat_msg(sb
, KERN_ERR
, "unable to set blocksize %u",
1258 logical_sector_size
);
1261 bh
= sb_bread(sb
, 0);
1263 fat_msg(sb
, KERN_ERR
, "unable to read boot sector"
1264 " (logical sector size = %lu)",
1268 b
= (struct fat_boot_sector
*) bh
->b_data
;
1271 sbi
->cluster_size
= sb
->s_blocksize
* sbi
->sec_per_clus
;
1272 sbi
->cluster_bits
= ffs(sbi
->cluster_size
) - 1;
1273 sbi
->fats
= b
->fats
;
1274 sbi
->fat_bits
= 0; /* Don't know yet */
1275 sbi
->fat_start
= le16_to_cpu(b
->reserved
);
1276 sbi
->fat_length
= le16_to_cpu(b
->fat_length
);
1277 sbi
->root_cluster
= 0;
1278 sbi
->free_clusters
= -1; /* Don't know yet */
1279 sbi
->free_clus_valid
= 0;
1280 sbi
->prev_free
= FAT_START_ENT
;
1281 sb
->s_maxbytes
= 0xffffffff;
1283 if (!sbi
->fat_length
&& b
->fat32_length
) {
1284 struct fat_boot_fsinfo
*fsinfo
;
1285 struct buffer_head
*fsinfo_bh
;
1289 sbi
->fat_length
= le32_to_cpu(b
->fat32_length
);
1290 sbi
->root_cluster
= le32_to_cpu(b
->root_cluster
);
1292 /* MC - if info_sector is 0, don't multiply by 0 */
1293 sbi
->fsinfo_sector
= le16_to_cpu(b
->info_sector
);
1294 if (sbi
->fsinfo_sector
== 0)
1295 sbi
->fsinfo_sector
= 1;
1297 fsinfo_bh
= sb_bread(sb
, sbi
->fsinfo_sector
);
1298 if (fsinfo_bh
== NULL
) {
1299 fat_msg(sb
, KERN_ERR
, "bread failed, FSINFO block"
1300 " (sector = %lu)", sbi
->fsinfo_sector
);
1305 fsinfo
= (struct fat_boot_fsinfo
*)fsinfo_bh
->b_data
;
1306 if (!IS_FSINFO(fsinfo
)) {
1307 fat_msg(sb
, KERN_WARNING
, "Invalid FSINFO signature: "
1308 "0x%08x, 0x%08x (sector = %lu)",
1309 le32_to_cpu(fsinfo
->signature1
),
1310 le32_to_cpu(fsinfo
->signature2
),
1311 sbi
->fsinfo_sector
);
1313 if (sbi
->options
.usefree
)
1314 sbi
->free_clus_valid
= 1;
1315 sbi
->free_clusters
= le32_to_cpu(fsinfo
->free_clusters
);
1316 sbi
->prev_free
= le32_to_cpu(fsinfo
->next_cluster
);
1322 sbi
->dir_per_block
= sb
->s_blocksize
/ sizeof(struct msdos_dir_entry
);
1323 sbi
->dir_per_block_bits
= ffs(sbi
->dir_per_block
) - 1;
1325 sbi
->dir_start
= sbi
->fat_start
+ sbi
->fats
* sbi
->fat_length
;
1326 sbi
->dir_entries
= get_unaligned_le16(&b
->dir_entries
);
1327 if (sbi
->dir_entries
& (sbi
->dir_per_block
- 1)) {
1329 fat_msg(sb
, KERN_ERR
, "bogus directroy-entries per block"
1330 " (%u)", sbi
->dir_entries
);
1335 rootdir_sectors
= sbi
->dir_entries
1336 * sizeof(struct msdos_dir_entry
) / sb
->s_blocksize
;
1337 sbi
->data_start
= sbi
->dir_start
+ rootdir_sectors
;
1338 total_sectors
= get_unaligned_le16(&b
->sectors
);
1339 if (total_sectors
== 0)
1340 total_sectors
= le32_to_cpu(b
->total_sect
);
1342 total_clusters
= (total_sectors
- sbi
->data_start
) / sbi
->sec_per_clus
;
1344 if (sbi
->fat_bits
!= 32)
1345 sbi
->fat_bits
= (total_clusters
> MAX_FAT12
) ? 16 : 12;
1347 /* check that FAT table does not overflow */
1348 fat_clusters
= sbi
->fat_length
* sb
->s_blocksize
* 8 / sbi
->fat_bits
;
1349 total_clusters
= min(total_clusters
, fat_clusters
- FAT_START_ENT
);
1350 if (total_clusters
> MAX_FAT(sb
)) {
1352 fat_msg(sb
, KERN_ERR
, "count of clusters too big (%u)",
1358 sbi
->max_cluster
= total_clusters
+ FAT_START_ENT
;
1359 /* check the free_clusters, it's not necessarily correct */
1360 if (sbi
->free_clusters
!= -1 && sbi
->free_clusters
> total_clusters
)
1361 sbi
->free_clusters
= -1;
1362 /* check the prev_free, it's not necessarily correct */
1363 sbi
->prev_free
%= sbi
->max_cluster
;
1364 if (sbi
->prev_free
< FAT_START_ENT
)
1365 sbi
->prev_free
= FAT_START_ENT
;
1369 /* set up enough so that it can read an inode */
1372 fat_ent_access_init(sb
);
1375 * The low byte of FAT's first entry must have same value with
1376 * media-field. But in real world, too many devices is
1377 * writing wrong value. So, removed that validity check.
1379 * if (FAT_FIRST_ENT(sb, media) != first)
1383 sprintf(buf
, "cp%d", sbi
->options
.codepage
);
1384 sbi
->nls_disk
= load_nls(buf
);
1385 if (!sbi
->nls_disk
) {
1386 fat_msg(sb
, KERN_ERR
, "codepage %s not found", buf
);
1390 /* FIXME: utf8 is using iocharset for upper/lower conversion */
1391 if (sbi
->options
.isvfat
) {
1392 sbi
->nls_io
= load_nls(sbi
->options
.iocharset
);
1394 fat_msg(sb
, KERN_ERR
, "IO charset %s not found",
1395 sbi
->options
.iocharset
);
1401 fat_inode
= new_inode(sb
);
1404 MSDOS_I(fat_inode
)->i_pos
= 0;
1405 sbi
->fat_inode
= fat_inode
;
1407 fsinfo_inode
= new_inode(sb
);
1410 fsinfo_inode
->i_ino
= MSDOS_FSINFO_INO
;
1411 sbi
->fsinfo_inode
= fsinfo_inode
;
1412 insert_inode_hash(fsinfo_inode
);
1414 root_inode
= new_inode(sb
);
1417 root_inode
->i_ino
= MSDOS_ROOT_INO
;
1418 root_inode
->i_version
= 1;
1419 error
= fat_read_root(root_inode
);
1425 insert_inode_hash(root_inode
);
1426 fat_attach(root_inode
, 0);
1427 sb
->s_root
= d_make_root(root_inode
);
1429 fat_msg(sb
, KERN_ERR
, "get root inode failed");
1438 fat_msg(sb
, KERN_INFO
, "Can't find a valid FAT filesystem");
1445 unload_nls(sbi
->nls_io
);
1446 unload_nls(sbi
->nls_disk
);
1447 if (sbi
->options
.iocharset
!= fat_default_iocharset
)
1448 kfree(sbi
->options
.iocharset
);
1449 sb
->s_fs_info
= NULL
;
1454 EXPORT_SYMBOL_GPL(fat_fill_super
);
1457 * helper function for fat_flush_inodes. This writes both the inode
1458 * and the file data blocks, waiting for in flight data blocks before
1459 * the start of the call. It does not wait for any io started
1462 static int writeback_inode(struct inode
*inode
)
1467 /* if we used wait=1, sync_inode_metadata waits for the io for the
1468 * inode to finish. So wait=0 is sent down to sync_inode_metadata
1469 * and filemap_fdatawrite is used for the data blocks
1471 ret
= sync_inode_metadata(inode
, 0);
1473 ret
= filemap_fdatawrite(inode
->i_mapping
);
1478 * write data and metadata corresponding to i1 and i2. The io is
1479 * started but we do not wait for any of it to finish.
1481 * filemap_flush is used for the block device, so if there is a dirty
1482 * page for a block already in flight, we will not wait and start the
1485 int fat_flush_inodes(struct super_block
*sb
, struct inode
*i1
, struct inode
*i2
)
1488 if (!MSDOS_SB(sb
)->options
.flush
)
1491 ret
= writeback_inode(i1
);
1493 ret
= writeback_inode(i2
);
1495 struct address_space
*mapping
= sb
->s_bdev
->bd_inode
->i_mapping
;
1496 ret
= filemap_flush(mapping
);
1500 EXPORT_SYMBOL_GPL(fat_flush_inodes
);
1502 static int __init
init_fat_fs(void)
1506 err
= fat_cache_init();
1510 err
= fat_init_inodecache();
1517 fat_cache_destroy();
1521 static void __exit
exit_fat_fs(void)
1523 fat_cache_destroy();
1524 fat_destroy_inodecache();
1527 module_init(init_fat_fs
)
1528 module_exit(exit_fat_fs
)
1530 MODULE_LICENSE("GPL");