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/pagemap.h>
20 #include <linux/mpage.h>
21 #include <linux/buffer_head.h>
22 #include <linux/exportfs.h>
23 #include <linux/mount.h>
24 #include <linux/vfs.h>
25 #include <linux/parser.h>
26 #include <linux/uio.h>
27 #include <linux/writeback.h>
28 #include <linux/log2.h>
29 #include <linux/hash.h>
30 #include <asm/unaligned.h>
33 #ifndef CONFIG_FAT_DEFAULT_IOCHARSET
34 /* if user don't select VFAT, this is undefined. */
35 #define CONFIG_FAT_DEFAULT_IOCHARSET ""
38 static int fat_default_codepage
= CONFIG_FAT_DEFAULT_CODEPAGE
;
39 static char fat_default_iocharset
[] = CONFIG_FAT_DEFAULT_IOCHARSET
;
42 static int fat_add_cluster(struct inode
*inode
)
46 err
= fat_alloc_clusters(inode
, &cluster
, 1);
49 /* FIXME: this cluster should be added after data of this
50 * cluster is writed */
51 err
= fat_chain_add(inode
, cluster
, 1);
53 fat_free_clusters(inode
, cluster
);
57 static inline int __fat_get_block(struct inode
*inode
, sector_t iblock
,
58 unsigned long *max_blocks
,
59 struct buffer_head
*bh_result
, int create
)
61 struct super_block
*sb
= inode
->i_sb
;
62 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
63 unsigned long mapped_blocks
;
67 err
= fat_bmap(inode
, iblock
, &phys
, &mapped_blocks
, create
);
71 map_bh(bh_result
, sb
, phys
);
72 *max_blocks
= min(mapped_blocks
, *max_blocks
);
78 if (iblock
!= MSDOS_I(inode
)->mmu_private
>> sb
->s_blocksize_bits
) {
79 fat_fs_panic(sb
, "corrupted file size (i_pos %lld, %lld)",
80 MSDOS_I(inode
)->i_pos
, MSDOS_I(inode
)->mmu_private
);
84 offset
= (unsigned long)iblock
& (sbi
->sec_per_clus
- 1);
86 /* TODO: multiple cluster allocation would be desirable. */
87 err
= fat_add_cluster(inode
);
91 /* available blocks on this cluster */
92 mapped_blocks
= sbi
->sec_per_clus
- offset
;
94 *max_blocks
= min(mapped_blocks
, *max_blocks
);
95 MSDOS_I(inode
)->mmu_private
+= *max_blocks
<< sb
->s_blocksize_bits
;
97 err
= fat_bmap(inode
, iblock
, &phys
, &mapped_blocks
, create
);
102 BUG_ON(*max_blocks
!= mapped_blocks
);
103 set_buffer_new(bh_result
);
104 map_bh(bh_result
, sb
, phys
);
109 static int fat_get_block(struct inode
*inode
, sector_t iblock
,
110 struct buffer_head
*bh_result
, int create
)
112 struct super_block
*sb
= inode
->i_sb
;
113 unsigned long max_blocks
= bh_result
->b_size
>> inode
->i_blkbits
;
116 err
= __fat_get_block(inode
, iblock
, &max_blocks
, bh_result
, create
);
119 bh_result
->b_size
= max_blocks
<< sb
->s_blocksize_bits
;
123 static int fat_writepage(struct page
*page
, struct writeback_control
*wbc
)
125 return block_write_full_page(page
, fat_get_block
, wbc
);
128 static int fat_writepages(struct address_space
*mapping
,
129 struct writeback_control
*wbc
)
131 return mpage_writepages(mapping
, wbc
, fat_get_block
);
134 static int fat_readpage(struct file
*file
, struct page
*page
)
136 return mpage_readpage(page
, fat_get_block
);
139 static int fat_readpages(struct file
*file
, struct address_space
*mapping
,
140 struct list_head
*pages
, unsigned nr_pages
)
142 return mpage_readpages(mapping
, pages
, nr_pages
, fat_get_block
);
145 static int fat_write_begin(struct file
*file
, struct address_space
*mapping
,
146 loff_t pos
, unsigned len
, unsigned flags
,
147 struct page
**pagep
, void **fsdata
)
150 return cont_write_begin(file
, mapping
, pos
, len
, flags
, pagep
, fsdata
,
152 &MSDOS_I(mapping
->host
)->mmu_private
);
155 static int fat_write_end(struct file
*file
, struct address_space
*mapping
,
156 loff_t pos
, unsigned len
, unsigned copied
,
157 struct page
*pagep
, void *fsdata
)
159 struct inode
*inode
= mapping
->host
;
161 err
= generic_write_end(file
, mapping
, pos
, len
, copied
, pagep
, fsdata
);
162 if (!(err
< 0) && !(MSDOS_I(inode
)->i_attrs
& ATTR_ARCH
)) {
163 inode
->i_mtime
= inode
->i_ctime
= CURRENT_TIME_SEC
;
164 MSDOS_I(inode
)->i_attrs
|= ATTR_ARCH
;
165 mark_inode_dirty(inode
);
170 static ssize_t
fat_direct_IO(int rw
, struct kiocb
*iocb
,
171 const struct iovec
*iov
,
172 loff_t offset
, unsigned long nr_segs
)
174 struct file
*file
= iocb
->ki_filp
;
175 struct inode
*inode
= file
->f_mapping
->host
;
179 * FIXME: blockdev_direct_IO() doesn't use ->write_begin(),
180 * so we need to update the ->mmu_private to block boundary.
182 * But we must fill the remaining area or hole by nul for
183 * updating ->mmu_private.
185 * Return 0, and fallback to normal buffered write.
187 loff_t size
= offset
+ iov_length(iov
, nr_segs
);
188 if (MSDOS_I(inode
)->mmu_private
< size
)
193 * FAT need to use the DIO_LOCKING for avoiding the race
194 * condition of fat_get_block() and ->truncate().
196 return blockdev_direct_IO(rw
, iocb
, inode
, inode
->i_sb
->s_bdev
, iov
,
197 offset
, nr_segs
, fat_get_block
, NULL
);
200 static sector_t
_fat_bmap(struct address_space
*mapping
, sector_t block
)
204 /* fat_get_cluster() assumes the requested blocknr isn't truncated. */
205 down_read(&mapping
->host
->i_alloc_sem
);
206 blocknr
= generic_block_bmap(mapping
, block
, fat_get_block
);
207 up_read(&mapping
->host
->i_alloc_sem
);
212 static const struct address_space_operations fat_aops
= {
213 .readpage
= fat_readpage
,
214 .readpages
= fat_readpages
,
215 .writepage
= fat_writepage
,
216 .writepages
= fat_writepages
,
217 .sync_page
= block_sync_page
,
218 .write_begin
= fat_write_begin
,
219 .write_end
= fat_write_end
,
220 .direct_IO
= fat_direct_IO
,
225 * New FAT inode stuff. We do the following:
226 * a) i_ino is constant and has nothing with on-disk location.
227 * b) FAT manages its own cache of directory entries.
228 * c) *This* cache is indexed by on-disk location.
229 * d) inode has an associated directory entry, all right, but
230 * it may be unhashed.
231 * e) currently entries are stored within struct inode. That should
233 * f) we deal with races in the following way:
234 * 1. readdir() and lookup() do FAT-dir-cache lookup.
235 * 2. rename() unhashes the F-d-c entry and rehashes it in
237 * 3. unlink() and rmdir() unhash F-d-c entry.
238 * 4. fat_write_inode() checks whether the thing is unhashed.
239 * If it is we silently return. If it isn't we do bread(),
240 * check if the location is still valid and retry if it
241 * isn't. Otherwise we do changes.
242 * 5. Spinlock is used to protect hash/unhash/location check/lookup
243 * 6. fat_clear_inode() unhashes the F-d-c entry.
244 * 7. lookup() and readdir() do igrab() if they find a F-d-c entry
245 * and consider negative result as cache miss.
248 static void fat_hash_init(struct super_block
*sb
)
250 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
253 spin_lock_init(&sbi
->inode_hash_lock
);
254 for (i
= 0; i
< FAT_HASH_SIZE
; i
++)
255 INIT_HLIST_HEAD(&sbi
->inode_hashtable
[i
]);
258 static inline unsigned long fat_hash(loff_t i_pos
)
260 return hash_32(i_pos
, FAT_HASH_BITS
);
263 void fat_attach(struct inode
*inode
, loff_t i_pos
)
265 struct msdos_sb_info
*sbi
= MSDOS_SB(inode
->i_sb
);
266 struct hlist_head
*head
= sbi
->inode_hashtable
+ fat_hash(i_pos
);
268 spin_lock(&sbi
->inode_hash_lock
);
269 MSDOS_I(inode
)->i_pos
= i_pos
;
270 hlist_add_head(&MSDOS_I(inode
)->i_fat_hash
, head
);
271 spin_unlock(&sbi
->inode_hash_lock
);
273 EXPORT_SYMBOL_GPL(fat_attach
);
275 void fat_detach(struct inode
*inode
)
277 struct msdos_sb_info
*sbi
= MSDOS_SB(inode
->i_sb
);
278 spin_lock(&sbi
->inode_hash_lock
);
279 MSDOS_I(inode
)->i_pos
= 0;
280 hlist_del_init(&MSDOS_I(inode
)->i_fat_hash
);
281 spin_unlock(&sbi
->inode_hash_lock
);
283 EXPORT_SYMBOL_GPL(fat_detach
);
285 struct inode
*fat_iget(struct super_block
*sb
, loff_t i_pos
)
287 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
288 struct hlist_head
*head
= sbi
->inode_hashtable
+ fat_hash(i_pos
);
289 struct hlist_node
*_p
;
290 struct msdos_inode_info
*i
;
291 struct inode
*inode
= NULL
;
293 spin_lock(&sbi
->inode_hash_lock
);
294 hlist_for_each_entry(i
, _p
, head
, i_fat_hash
) {
295 BUG_ON(i
->vfs_inode
.i_sb
!= sb
);
296 if (i
->i_pos
!= i_pos
)
298 inode
= igrab(&i
->vfs_inode
);
302 spin_unlock(&sbi
->inode_hash_lock
);
306 static int is_exec(unsigned char *extension
)
308 unsigned char *exe_extensions
= "EXECOMBAT", *walk
;
310 for (walk
= exe_extensions
; *walk
; walk
+= 3)
311 if (!strncmp(extension
, walk
, 3))
316 static int fat_calc_dir_size(struct inode
*inode
)
318 struct msdos_sb_info
*sbi
= MSDOS_SB(inode
->i_sb
);
319 int ret
, fclus
, dclus
;
322 if (MSDOS_I(inode
)->i_start
== 0)
325 ret
= fat_get_cluster(inode
, FAT_ENT_EOF
, &fclus
, &dclus
);
328 inode
->i_size
= (fclus
+ 1) << sbi
->cluster_bits
;
333 /* doesn't deal with root inode */
334 static int fat_fill_inode(struct inode
*inode
, struct msdos_dir_entry
*de
)
336 struct msdos_sb_info
*sbi
= MSDOS_SB(inode
->i_sb
);
339 MSDOS_I(inode
)->i_pos
= 0;
340 inode
->i_uid
= sbi
->options
.fs_uid
;
341 inode
->i_gid
= sbi
->options
.fs_gid
;
343 inode
->i_generation
= get_seconds();
345 if ((de
->attr
& ATTR_DIR
) && !IS_FREE(de
->name
)) {
346 inode
->i_generation
&= ~1;
347 inode
->i_mode
= fat_make_mode(sbi
, de
->attr
, S_IRWXUGO
);
348 inode
->i_op
= sbi
->dir_ops
;
349 inode
->i_fop
= &fat_dir_operations
;
351 MSDOS_I(inode
)->i_start
= le16_to_cpu(de
->start
);
352 if (sbi
->fat_bits
== 32)
353 MSDOS_I(inode
)->i_start
|= (le16_to_cpu(de
->starthi
) << 16);
355 MSDOS_I(inode
)->i_logstart
= MSDOS_I(inode
)->i_start
;
356 error
= fat_calc_dir_size(inode
);
359 MSDOS_I(inode
)->mmu_private
= inode
->i_size
;
361 inode
->i_nlink
= fat_subdirs(inode
);
362 } else { /* not a directory */
363 inode
->i_generation
|= 1;
364 inode
->i_mode
= fat_make_mode(sbi
, de
->attr
,
365 ((sbi
->options
.showexec
&& !is_exec(de
->name
+ 8))
366 ? S_IRUGO
|S_IWUGO
: S_IRWXUGO
));
367 MSDOS_I(inode
)->i_start
= le16_to_cpu(de
->start
);
368 if (sbi
->fat_bits
== 32)
369 MSDOS_I(inode
)->i_start
|= (le16_to_cpu(de
->starthi
) << 16);
371 MSDOS_I(inode
)->i_logstart
= MSDOS_I(inode
)->i_start
;
372 inode
->i_size
= le32_to_cpu(de
->size
);
373 inode
->i_op
= &fat_file_inode_operations
;
374 inode
->i_fop
= &fat_file_operations
;
375 inode
->i_mapping
->a_ops
= &fat_aops
;
376 MSDOS_I(inode
)->mmu_private
= inode
->i_size
;
378 if (de
->attr
& ATTR_SYS
) {
379 if (sbi
->options
.sys_immutable
)
380 inode
->i_flags
|= S_IMMUTABLE
;
382 fat_save_attrs(inode
, de
->attr
);
384 inode
->i_blocks
= ((inode
->i_size
+ (sbi
->cluster_size
- 1))
385 & ~((loff_t
)sbi
->cluster_size
- 1)) >> 9;
387 fat_time_fat2unix(sbi
, &inode
->i_mtime
, de
->time
, de
->date
, 0);
388 if (sbi
->options
.isvfat
) {
389 fat_time_fat2unix(sbi
, &inode
->i_ctime
, de
->ctime
,
390 de
->cdate
, de
->ctime_cs
);
391 fat_time_fat2unix(sbi
, &inode
->i_atime
, 0, de
->adate
, 0);
393 inode
->i_ctime
= inode
->i_atime
= inode
->i_mtime
;
398 struct inode
*fat_build_inode(struct super_block
*sb
,
399 struct msdos_dir_entry
*de
, loff_t i_pos
)
404 inode
= fat_iget(sb
, i_pos
);
407 inode
= new_inode(sb
);
409 inode
= ERR_PTR(-ENOMEM
);
412 inode
->i_ino
= iunique(sb
, MSDOS_ROOT_INO
);
413 inode
->i_version
= 1;
414 err
= fat_fill_inode(inode
, de
);
417 inode
= ERR_PTR(err
);
420 fat_attach(inode
, i_pos
);
421 insert_inode_hash(inode
);
426 EXPORT_SYMBOL_GPL(fat_build_inode
);
428 static void fat_delete_inode(struct inode
*inode
)
430 truncate_inode_pages(&inode
->i_data
, 0);
436 static void fat_clear_inode(struct inode
*inode
)
438 fat_cache_inval_inode(inode
);
442 static void fat_write_super(struct super_block
*sb
)
446 if (!(sb
->s_flags
& MS_RDONLY
))
447 fat_clusters_flush(sb
);
450 static void fat_put_super(struct super_block
*sb
)
452 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
460 unload_nls(sbi
->nls_disk
);
461 sbi
->nls_disk
= NULL
;
462 sbi
->options
.codepage
= fat_default_codepage
;
465 unload_nls(sbi
->nls_io
);
468 if (sbi
->options
.iocharset
!= fat_default_iocharset
) {
469 kfree(sbi
->options
.iocharset
);
470 sbi
->options
.iocharset
= fat_default_iocharset
;
473 sb
->s_fs_info
= NULL
;
479 static struct kmem_cache
*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
, GFP_NOFS
);
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
)
497 struct msdos_inode_info
*ei
= (struct msdos_inode_info
*)foo
;
499 spin_lock_init(&ei
->cache_lru_lock
);
501 ei
->cache_valid_id
= FAT_CACHE_VALID
+ 1;
502 INIT_LIST_HEAD(&ei
->cache_lru
);
503 INIT_HLIST_NODE(&ei
->i_fat_hash
);
504 inode_init_once(&ei
->vfs_inode
);
507 static int __init
fat_init_inodecache(void)
509 fat_inode_cachep
= kmem_cache_create("fat_inode_cache",
510 sizeof(struct msdos_inode_info
),
511 0, (SLAB_RECLAIM_ACCOUNT
|
514 if (fat_inode_cachep
== NULL
)
519 static void __exit
fat_destroy_inodecache(void)
521 kmem_cache_destroy(fat_inode_cachep
);
524 static int fat_remount(struct super_block
*sb
, int *flags
, char *data
)
526 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
527 *flags
|= MS_NODIRATIME
| (sbi
->options
.isvfat
? 0 : MS_NOATIME
);
531 static int fat_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
533 struct super_block
*sb
= dentry
->d_sb
;
534 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
535 u64 id
= huge_encode_dev(sb
->s_bdev
->bd_dev
);
537 /* If the count of free cluster is still unknown, counts it here. */
538 if (sbi
->free_clusters
== -1 || !sbi
->free_clus_valid
) {
539 int err
= fat_count_free_clusters(dentry
->d_sb
);
544 buf
->f_type
= dentry
->d_sb
->s_magic
;
545 buf
->f_bsize
= sbi
->cluster_size
;
546 buf
->f_blocks
= sbi
->max_cluster
- FAT_START_ENT
;
547 buf
->f_bfree
= sbi
->free_clusters
;
548 buf
->f_bavail
= sbi
->free_clusters
;
549 buf
->f_fsid
.val
[0] = (u32
)id
;
550 buf
->f_fsid
.val
[1] = (u32
)(id
>> 32);
551 buf
->f_namelen
= sbi
->options
.isvfat
? 260 : 12;
556 static inline loff_t
fat_i_pos_read(struct msdos_sb_info
*sbi
,
560 #if BITS_PER_LONG == 32
561 spin_lock(&sbi
->inode_hash_lock
);
563 i_pos
= MSDOS_I(inode
)->i_pos
;
564 #if BITS_PER_LONG == 32
565 spin_unlock(&sbi
->inode_hash_lock
);
570 static int fat_write_inode(struct inode
*inode
, int wait
)
572 struct super_block
*sb
= inode
->i_sb
;
573 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
574 struct buffer_head
*bh
;
575 struct msdos_dir_entry
*raw_entry
;
579 if (inode
->i_ino
== MSDOS_ROOT_INO
)
583 i_pos
= fat_i_pos_read(sbi
, inode
);
587 bh
= sb_bread(sb
, i_pos
>> sbi
->dir_per_block_bits
);
589 printk(KERN_ERR
"FAT: unable to read inode block "
590 "for updating (i_pos %lld)\n", i_pos
);
593 spin_lock(&sbi
->inode_hash_lock
);
594 if (i_pos
!= MSDOS_I(inode
)->i_pos
) {
595 spin_unlock(&sbi
->inode_hash_lock
);
600 raw_entry
= &((struct msdos_dir_entry
*) (bh
->b_data
))
601 [i_pos
& (sbi
->dir_per_block
- 1)];
602 if (S_ISDIR(inode
->i_mode
))
605 raw_entry
->size
= cpu_to_le32(inode
->i_size
);
606 raw_entry
->attr
= fat_make_attrs(inode
);
607 raw_entry
->start
= cpu_to_le16(MSDOS_I(inode
)->i_logstart
);
608 raw_entry
->starthi
= cpu_to_le16(MSDOS_I(inode
)->i_logstart
>> 16);
609 fat_time_unix2fat(sbi
, &inode
->i_mtime
, &raw_entry
->time
,
610 &raw_entry
->date
, NULL
);
611 if (sbi
->options
.isvfat
) {
613 fat_time_unix2fat(sbi
, &inode
->i_ctime
, &raw_entry
->ctime
,
614 &raw_entry
->cdate
, &raw_entry
->ctime_cs
);
615 fat_time_unix2fat(sbi
, &inode
->i_atime
, &atime
,
616 &raw_entry
->adate
, NULL
);
618 spin_unlock(&sbi
->inode_hash_lock
);
619 mark_buffer_dirty(bh
);
622 err
= sync_dirty_buffer(bh
);
627 int fat_sync_inode(struct inode
*inode
)
629 return fat_write_inode(inode
, 1);
632 EXPORT_SYMBOL_GPL(fat_sync_inode
);
634 static int fat_show_options(struct seq_file
*m
, struct vfsmount
*mnt
);
635 static const struct super_operations fat_sops
= {
636 .alloc_inode
= fat_alloc_inode
,
637 .destroy_inode
= fat_destroy_inode
,
638 .write_inode
= fat_write_inode
,
639 .delete_inode
= fat_delete_inode
,
640 .put_super
= fat_put_super
,
641 .write_super
= fat_write_super
,
642 .statfs
= fat_statfs
,
643 .clear_inode
= fat_clear_inode
,
644 .remount_fs
= fat_remount
,
646 .show_options
= fat_show_options
,
650 * a FAT file handle with fhtype 3 is
651 * 0/ i_ino - for fast, reliable lookup if still in the cache
652 * 1/ i_generation - to see if i_ino is still valid
653 * bit 0 == 0 iff directory
654 * 2/ i_pos(8-39) - if ino has changed, but still in cache
655 * 3/ i_pos(4-7)|i_logstart - to semi-verify inode found at i_pos
656 * 4/ i_pos(0-3)|parent->i_logstart - maybe used to hunt for the file on disc
658 * Hack for NFSv2: Maximum FAT entry number is 28bits and maximum
659 * i_pos is 40bits (blocknr(32) + dir offset(8)), so two 4bits
660 * of i_logstart is used to store the directory entry offset.
663 static struct dentry
*fat_fh_to_dentry(struct super_block
*sb
,
664 struct fid
*fid
, int fh_len
, int fh_type
)
666 struct inode
*inode
= NULL
;
667 struct dentry
*result
;
670 if (fh_len
< 5 || fh_type
!= 3)
673 inode
= ilookup(sb
, fh
[0]);
674 if (!inode
|| inode
->i_generation
!= fh
[1]) {
681 int i_logstart
= fh
[3] & 0x0fffffff;
683 i_pos
= (loff_t
)fh
[2] << 8;
684 i_pos
|= ((fh
[3] >> 24) & 0xf0) | (fh
[4] >> 28);
686 /* try 2 - see if i_pos is in F-d-c
687 * require i_logstart to be the same
688 * Will fail if you truncate and then re-write
691 inode
= fat_iget(sb
, i_pos
);
692 if (inode
&& MSDOS_I(inode
)->i_logstart
!= i_logstart
) {
699 * For now, do nothing if the inode is not found.
701 * What we could do is:
703 * - follow the file starting at fh[4], and record the ".." entry,
704 * and the name of the fh[2] entry.
705 * - then follow the ".." file finding the next step up.
707 * This way we build a path to the root of the tree. If this works, we
708 * lookup the path and so get this inode into the cache. Finally try
709 * the fat_iget lookup again. If that fails, then we are totally out
710 * of luck. But all that is for another day
712 result
= d_obtain_alias(inode
);
714 result
->d_op
= sb
->s_root
->d_op
;
719 fat_encode_fh(struct dentry
*de
, __u32
*fh
, int *lenp
, int connectable
)
722 struct inode
*inode
= de
->d_inode
;
723 u32 ipos_h
, ipos_m
, ipos_l
;
726 return 255; /* no room */
728 ipos_h
= MSDOS_I(inode
)->i_pos
>> 8;
729 ipos_m
= (MSDOS_I(inode
)->i_pos
& 0xf0) << 24;
730 ipos_l
= (MSDOS_I(inode
)->i_pos
& 0x0f) << 28;
732 fh
[0] = inode
->i_ino
;
733 fh
[1] = inode
->i_generation
;
735 fh
[3] = ipos_m
| MSDOS_I(inode
)->i_logstart
;
736 spin_lock(&de
->d_lock
);
737 fh
[4] = ipos_l
| MSDOS_I(de
->d_parent
->d_inode
)->i_logstart
;
738 spin_unlock(&de
->d_lock
);
742 static struct dentry
*fat_get_parent(struct dentry
*child
)
744 struct super_block
*sb
= child
->d_sb
;
745 struct buffer_head
*bh
;
746 struct msdos_dir_entry
*de
;
748 struct dentry
*parent
;
754 err
= fat_get_dotdot_entry(child
->d_inode
, &bh
, &de
, &i_pos
);
756 parent
= ERR_PTR(err
);
759 inode
= fat_build_inode(sb
, de
, i_pos
);
762 parent
= d_obtain_alias(inode
);
764 parent
->d_op
= sb
->s_root
->d_op
;
771 static const struct export_operations fat_export_ops
= {
772 .encode_fh
= fat_encode_fh
,
773 .fh_to_dentry
= fat_fh_to_dentry
,
774 .get_parent
= fat_get_parent
,
777 static int fat_show_options(struct seq_file
*m
, struct vfsmount
*mnt
)
779 struct msdos_sb_info
*sbi
= MSDOS_SB(mnt
->mnt_sb
);
780 struct fat_mount_options
*opts
= &sbi
->options
;
781 int isvfat
= opts
->isvfat
;
783 if (opts
->fs_uid
!= 0)
784 seq_printf(m
, ",uid=%u", opts
->fs_uid
);
785 if (opts
->fs_gid
!= 0)
786 seq_printf(m
, ",gid=%u", opts
->fs_gid
);
787 seq_printf(m
, ",fmask=%04o", opts
->fs_fmask
);
788 seq_printf(m
, ",dmask=%04o", opts
->fs_dmask
);
789 if (opts
->allow_utime
)
790 seq_printf(m
, ",allow_utime=%04o", opts
->allow_utime
);
792 seq_printf(m
, ",codepage=%s", sbi
->nls_disk
->charset
);
795 seq_printf(m
, ",iocharset=%s", sbi
->nls_io
->charset
);
797 switch (opts
->shortname
) {
798 case VFAT_SFN_DISPLAY_WIN95
| VFAT_SFN_CREATE_WIN95
:
799 seq_puts(m
, ",shortname=win95");
801 case VFAT_SFN_DISPLAY_WINNT
| VFAT_SFN_CREATE_WINNT
:
802 seq_puts(m
, ",shortname=winnt");
804 case VFAT_SFN_DISPLAY_WINNT
| VFAT_SFN_CREATE_WIN95
:
805 seq_puts(m
, ",shortname=mixed");
807 case VFAT_SFN_DISPLAY_LOWER
| VFAT_SFN_CREATE_WIN95
:
808 /* seq_puts(m, ",shortname=lower"); */
811 seq_puts(m
, ",shortname=unknown");
815 if (opts
->name_check
!= 'n')
816 seq_printf(m
, ",check=%c", opts
->name_check
);
818 seq_puts(m
, ",usefree");
820 seq_puts(m
, ",quiet");
822 seq_puts(m
, ",showexec");
823 if (opts
->sys_immutable
)
824 seq_puts(m
, ",sys_immutable");
827 seq_puts(m
, ",dotsOK=yes");
829 seq_puts(m
, ",nocase");
832 seq_puts(m
, ",utf8");
833 if (opts
->unicode_xlate
)
834 seq_puts(m
, ",uni_xlate");
836 seq_puts(m
, ",nonumtail");
838 seq_puts(m
, ",rodir");
841 seq_puts(m
, ",flush");
843 seq_puts(m
, ",tz=UTC");
849 Opt_check_n
, Opt_check_r
, Opt_check_s
, Opt_uid
, Opt_gid
,
850 Opt_umask
, Opt_dmask
, Opt_fmask
, Opt_allow_utime
, Opt_codepage
,
851 Opt_usefree
, Opt_nocase
, Opt_quiet
, Opt_showexec
, Opt_debug
,
852 Opt_immutable
, 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_flush
, Opt_tz_utc
, Opt_rodir
, Opt_err
,
859 static const 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_allow_utime
, "allow_utime=%o"},
872 {Opt_codepage
, "codepage=%u"},
873 {Opt_usefree
, "usefree"},
874 {Opt_nocase
, "nocase"},
875 {Opt_quiet
, "quiet"},
876 {Opt_showexec
, "showexec"},
877 {Opt_debug
, "debug"},
878 {Opt_immutable
, "sys_immutable"},
879 {Opt_obsolate
, "conv=binary"},
880 {Opt_obsolate
, "conv=text"},
881 {Opt_obsolate
, "conv=auto"},
882 {Opt_obsolate
, "conv=b"},
883 {Opt_obsolate
, "conv=t"},
884 {Opt_obsolate
, "conv=a"},
885 {Opt_obsolate
, "fat=%u"},
886 {Opt_obsolate
, "blocksize=%u"},
887 {Opt_obsolate
, "cvf_format=%20s"},
888 {Opt_obsolate
, "cvf_options=%100s"},
889 {Opt_obsolate
, "posix"},
890 {Opt_flush
, "flush"},
891 {Opt_tz_utc
, "tz=UTC"},
894 static const match_table_t msdos_tokens
= {
895 {Opt_nodots
, "nodots"},
896 {Opt_nodots
, "dotsOK=no"},
898 {Opt_dots
, "dotsOK=yes"},
901 static const match_table_t vfat_tokens
= {
902 {Opt_charset
, "iocharset=%s"},
903 {Opt_shortname_lower
, "shortname=lower"},
904 {Opt_shortname_win95
, "shortname=win95"},
905 {Opt_shortname_winnt
, "shortname=winnt"},
906 {Opt_shortname_mixed
, "shortname=mixed"},
907 {Opt_utf8_no
, "utf8=0"}, /* 0 or no or false */
908 {Opt_utf8_no
, "utf8=no"},
909 {Opt_utf8_no
, "utf8=false"},
910 {Opt_utf8_yes
, "utf8=1"}, /* empty or 1 or yes or true */
911 {Opt_utf8_yes
, "utf8=yes"},
912 {Opt_utf8_yes
, "utf8=true"},
913 {Opt_utf8_yes
, "utf8"},
914 {Opt_uni_xl_no
, "uni_xlate=0"}, /* 0 or no or false */
915 {Opt_uni_xl_no
, "uni_xlate=no"},
916 {Opt_uni_xl_no
, "uni_xlate=false"},
917 {Opt_uni_xl_yes
, "uni_xlate=1"}, /* empty or 1 or yes or true */
918 {Opt_uni_xl_yes
, "uni_xlate=yes"},
919 {Opt_uni_xl_yes
, "uni_xlate=true"},
920 {Opt_uni_xl_yes
, "uni_xlate"},
921 {Opt_nonumtail_no
, "nonumtail=0"}, /* 0 or no or false */
922 {Opt_nonumtail_no
, "nonumtail=no"},
923 {Opt_nonumtail_no
, "nonumtail=false"},
924 {Opt_nonumtail_yes
, "nonumtail=1"}, /* empty or 1 or yes or true */
925 {Opt_nonumtail_yes
, "nonumtail=yes"},
926 {Opt_nonumtail_yes
, "nonumtail=true"},
927 {Opt_nonumtail_yes
, "nonumtail"},
928 {Opt_rodir
, "rodir"},
932 static int parse_options(char *options
, int is_vfat
, int silent
, int *debug
,
933 struct fat_mount_options
*opts
)
936 substring_t args
[MAX_OPT_ARGS
];
940 opts
->isvfat
= is_vfat
;
942 opts
->fs_uid
= current_uid();
943 opts
->fs_gid
= current_gid();
944 opts
->fs_fmask
= current_umask();
945 opts
->allow_utime
= -1;
946 opts
->codepage
= fat_default_codepage
;
947 opts
->iocharset
= fat_default_iocharset
;
949 opts
->shortname
= VFAT_SFN_DISPLAY_LOWER
|VFAT_SFN_CREATE_WIN95
;
955 opts
->name_check
= 'n';
956 opts
->quiet
= opts
->showexec
= opts
->sys_immutable
= opts
->dotsOK
= 0;
957 opts
->utf8
= opts
->unicode_xlate
= 0;
959 opts
->usefree
= opts
->nocase
= 0;
966 while ((p
= strsep(&options
, ",")) != NULL
) {
971 token
= match_token(p
, fat_tokens
, args
);
972 if (token
== Opt_err
) {
974 token
= match_token(p
, vfat_tokens
, args
);
976 token
= match_token(p
, msdos_tokens
, args
);
980 opts
->name_check
= 's';
983 opts
->name_check
= 'r';
986 opts
->name_check
= 'n';
995 /* for backward compatibility */
996 opts
->shortname
= VFAT_SFN_DISPLAY_WIN95
997 | VFAT_SFN_CREATE_WIN95
;
1010 opts
->sys_immutable
= 1;
1013 if (match_int(&args
[0], &option
))
1015 opts
->fs_uid
= option
;
1018 if (match_int(&args
[0], &option
))
1020 opts
->fs_gid
= option
;
1023 if (match_octal(&args
[0], &option
))
1025 opts
->fs_fmask
= opts
->fs_dmask
= option
;
1028 if (match_octal(&args
[0], &option
))
1030 opts
->fs_dmask
= option
;
1033 if (match_octal(&args
[0], &option
))
1035 opts
->fs_fmask
= option
;
1037 case Opt_allow_utime
:
1038 if (match_octal(&args
[0], &option
))
1040 opts
->allow_utime
= option
& (S_IWGRP
| S_IWOTH
);
1043 if (match_int(&args
[0], &option
))
1045 opts
->codepage
= option
;
1054 /* msdos specific */
1064 if (opts
->iocharset
!= fat_default_iocharset
)
1065 kfree(opts
->iocharset
);
1066 iocharset
= match_strdup(&args
[0]);
1069 opts
->iocharset
= iocharset
;
1071 case Opt_shortname_lower
:
1072 opts
->shortname
= VFAT_SFN_DISPLAY_LOWER
1073 | VFAT_SFN_CREATE_WIN95
;
1075 case Opt_shortname_win95
:
1076 opts
->shortname
= VFAT_SFN_DISPLAY_WIN95
1077 | VFAT_SFN_CREATE_WIN95
;
1079 case Opt_shortname_winnt
:
1080 opts
->shortname
= VFAT_SFN_DISPLAY_WINNT
1081 | VFAT_SFN_CREATE_WINNT
;
1083 case Opt_shortname_mixed
:
1084 opts
->shortname
= VFAT_SFN_DISPLAY_WINNT
1085 | VFAT_SFN_CREATE_WIN95
;
1087 case Opt_utf8_no
: /* 0 or no or false */
1090 case Opt_utf8_yes
: /* empty or 1 or yes or true */
1093 case Opt_uni_xl_no
: /* 0 or no or false */
1094 opts
->unicode_xlate
= 0;
1096 case Opt_uni_xl_yes
: /* empty or 1 or yes or true */
1097 opts
->unicode_xlate
= 1;
1099 case Opt_nonumtail_no
: /* 0 or no or false */
1100 opts
->numtail
= 1; /* negated option */
1102 case Opt_nonumtail_yes
: /* empty or 1 or yes or true */
1103 opts
->numtail
= 0; /* negated option */
1109 /* obsolete mount options */
1111 printk(KERN_INFO
"FAT: \"%s\" option is obsolete, "
1112 "not supported now\n", p
);
1114 /* unknown option */
1118 "FAT: Unrecognized mount option \"%s\" "
1119 "or missing value\n", p
);
1126 /* UTF-8 doesn't provide FAT semantics */
1127 if (!strcmp(opts
->iocharset
, "utf8")) {
1128 printk(KERN_ERR
"FAT: utf8 is not a recommended IO charset"
1129 " for FAT filesystems, filesystem will be "
1130 "case sensitive!\n");
1133 /* If user doesn't specify allow_utime, it's initialized from dmask. */
1134 if (opts
->allow_utime
== (unsigned short)-1)
1135 opts
->allow_utime
= ~opts
->fs_dmask
& (S_IWGRP
| S_IWOTH
);
1136 if (opts
->unicode_xlate
)
1142 static int fat_read_root(struct inode
*inode
)
1144 struct super_block
*sb
= inode
->i_sb
;
1145 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
1148 MSDOS_I(inode
)->i_pos
= 0;
1149 inode
->i_uid
= sbi
->options
.fs_uid
;
1150 inode
->i_gid
= sbi
->options
.fs_gid
;
1152 inode
->i_generation
= 0;
1153 inode
->i_mode
= fat_make_mode(sbi
, ATTR_DIR
, S_IRWXUGO
);
1154 inode
->i_op
= sbi
->dir_ops
;
1155 inode
->i_fop
= &fat_dir_operations
;
1156 if (sbi
->fat_bits
== 32) {
1157 MSDOS_I(inode
)->i_start
= sbi
->root_cluster
;
1158 error
= fat_calc_dir_size(inode
);
1162 MSDOS_I(inode
)->i_start
= 0;
1163 inode
->i_size
= sbi
->dir_entries
* sizeof(struct msdos_dir_entry
);
1165 inode
->i_blocks
= ((inode
->i_size
+ (sbi
->cluster_size
- 1))
1166 & ~((loff_t
)sbi
->cluster_size
- 1)) >> 9;
1167 MSDOS_I(inode
)->i_logstart
= 0;
1168 MSDOS_I(inode
)->mmu_private
= inode
->i_size
;
1170 fat_save_attrs(inode
, ATTR_DIR
);
1171 inode
->i_mtime
.tv_sec
= inode
->i_atime
.tv_sec
= inode
->i_ctime
.tv_sec
= 0;
1172 inode
->i_mtime
.tv_nsec
= inode
->i_atime
.tv_nsec
= inode
->i_ctime
.tv_nsec
= 0;
1173 inode
->i_nlink
= fat_subdirs(inode
)+2;
1179 * Read the super block of an MS-DOS FS.
1181 int fat_fill_super(struct super_block
*sb
, void *data
, int silent
,
1182 const struct inode_operations
*fs_dir_inode_ops
, int isvfat
)
1184 struct inode
*root_inode
= NULL
;
1185 struct buffer_head
*bh
;
1186 struct fat_boot_sector
*b
;
1187 struct msdos_sb_info
*sbi
;
1188 u16 logical_sector_size
;
1189 u32 total_sectors
, total_clusters
, fat_clusters
, rootdir_sectors
;
1196 * GFP_KERNEL is ok here, because while we do hold the
1197 * supeblock lock, memory pressure can't call back into
1198 * the filesystem, since we're only just about to mount
1199 * it and have no inodes etc active!
1201 sbi
= kzalloc(sizeof(struct msdos_sb_info
), GFP_KERNEL
);
1204 sb
->s_fs_info
= sbi
;
1206 sb
->s_flags
|= MS_NODIRATIME
;
1207 sb
->s_magic
= MSDOS_SUPER_MAGIC
;
1208 sb
->s_op
= &fat_sops
;
1209 sb
->s_export_op
= &fat_export_ops
;
1210 sbi
->dir_ops
= fs_dir_inode_ops
;
1212 error
= parse_options(data
, isvfat
, silent
, &debug
, &sbi
->options
);
1217 sb_min_blocksize(sb
, 512);
1218 bh
= sb_bread(sb
, 0);
1220 printk(KERN_ERR
"FAT: unable to read boot sector\n");
1224 b
= (struct fat_boot_sector
*) bh
->b_data
;
1227 printk(KERN_ERR
"FAT: bogus number of reserved sectors\n");
1233 printk(KERN_ERR
"FAT: bogus number of FAT structure\n");
1239 * Earlier we checked here that b->secs_track and b->head are nonzero,
1240 * but it turns out valid FAT filesystems can have zero there.
1244 if (!fat_valid_media(media
)) {
1246 printk(KERN_ERR
"FAT: invalid media value (0x%02x)\n",
1251 logical_sector_size
= get_unaligned_le16(&b
->sector_size
);
1252 if (!is_power_of_2(logical_sector_size
)
1253 || (logical_sector_size
< 512)
1254 || (logical_sector_size
> 4096)) {
1256 printk(KERN_ERR
"FAT: bogus logical sector size %u\n",
1257 logical_sector_size
);
1261 sbi
->sec_per_clus
= b
->sec_per_clus
;
1262 if (!is_power_of_2(sbi
->sec_per_clus
)) {
1264 printk(KERN_ERR
"FAT: bogus sectors per cluster %u\n",
1270 if (logical_sector_size
< sb
->s_blocksize
) {
1271 printk(KERN_ERR
"FAT: logical sector size too small for device"
1272 " (logical sector size = %u)\n", logical_sector_size
);
1276 if (logical_sector_size
> sb
->s_blocksize
) {
1279 if (!sb_set_blocksize(sb
, logical_sector_size
)) {
1280 printk(KERN_ERR
"FAT: unable to set blocksize %u\n",
1281 logical_sector_size
);
1284 bh
= sb_bread(sb
, 0);
1286 printk(KERN_ERR
"FAT: unable to read boot sector"
1287 " (logical sector size = %lu)\n",
1291 b
= (struct fat_boot_sector
*) bh
->b_data
;
1294 sbi
->cluster_size
= sb
->s_blocksize
* sbi
->sec_per_clus
;
1295 sbi
->cluster_bits
= ffs(sbi
->cluster_size
) - 1;
1296 sbi
->fats
= b
->fats
;
1297 sbi
->fat_bits
= 0; /* Don't know yet */
1298 sbi
->fat_start
= le16_to_cpu(b
->reserved
);
1299 sbi
->fat_length
= le16_to_cpu(b
->fat_length
);
1300 sbi
->root_cluster
= 0;
1301 sbi
->free_clusters
= -1; /* Don't know yet */
1302 sbi
->free_clus_valid
= 0;
1303 sbi
->prev_free
= FAT_START_ENT
;
1305 if (!sbi
->fat_length
&& b
->fat32_length
) {
1306 struct fat_boot_fsinfo
*fsinfo
;
1307 struct buffer_head
*fsinfo_bh
;
1311 sbi
->fat_length
= le32_to_cpu(b
->fat32_length
);
1312 sbi
->root_cluster
= le32_to_cpu(b
->root_cluster
);
1314 sb
->s_maxbytes
= 0xffffffff;
1316 /* MC - if info_sector is 0, don't multiply by 0 */
1317 sbi
->fsinfo_sector
= le16_to_cpu(b
->info_sector
);
1318 if (sbi
->fsinfo_sector
== 0)
1319 sbi
->fsinfo_sector
= 1;
1321 fsinfo_bh
= sb_bread(sb
, sbi
->fsinfo_sector
);
1322 if (fsinfo_bh
== NULL
) {
1323 printk(KERN_ERR
"FAT: bread failed, FSINFO block"
1324 " (sector = %lu)\n", sbi
->fsinfo_sector
);
1329 fsinfo
= (struct fat_boot_fsinfo
*)fsinfo_bh
->b_data
;
1330 if (!IS_FSINFO(fsinfo
)) {
1331 printk(KERN_WARNING
"FAT: Invalid FSINFO signature: "
1332 "0x%08x, 0x%08x (sector = %lu)\n",
1333 le32_to_cpu(fsinfo
->signature1
),
1334 le32_to_cpu(fsinfo
->signature2
),
1335 sbi
->fsinfo_sector
);
1337 if (sbi
->options
.usefree
)
1338 sbi
->free_clus_valid
= 1;
1339 sbi
->free_clusters
= le32_to_cpu(fsinfo
->free_clusters
);
1340 sbi
->prev_free
= le32_to_cpu(fsinfo
->next_cluster
);
1346 sbi
->dir_per_block
= sb
->s_blocksize
/ sizeof(struct msdos_dir_entry
);
1347 sbi
->dir_per_block_bits
= ffs(sbi
->dir_per_block
) - 1;
1349 sbi
->dir_start
= sbi
->fat_start
+ sbi
->fats
* sbi
->fat_length
;
1350 sbi
->dir_entries
= get_unaligned_le16(&b
->dir_entries
);
1351 if (sbi
->dir_entries
& (sbi
->dir_per_block
- 1)) {
1353 printk(KERN_ERR
"FAT: bogus directroy-entries per block"
1354 " (%u)\n", sbi
->dir_entries
);
1359 rootdir_sectors
= sbi
->dir_entries
1360 * sizeof(struct msdos_dir_entry
) / sb
->s_blocksize
;
1361 sbi
->data_start
= sbi
->dir_start
+ rootdir_sectors
;
1362 total_sectors
= get_unaligned_le16(&b
->sectors
);
1363 if (total_sectors
== 0)
1364 total_sectors
= le32_to_cpu(b
->total_sect
);
1366 total_clusters
= (total_sectors
- sbi
->data_start
) / sbi
->sec_per_clus
;
1368 if (sbi
->fat_bits
!= 32)
1369 sbi
->fat_bits
= (total_clusters
> MAX_FAT12
) ? 16 : 12;
1371 /* check that FAT table does not overflow */
1372 fat_clusters
= sbi
->fat_length
* sb
->s_blocksize
* 8 / sbi
->fat_bits
;
1373 total_clusters
= min(total_clusters
, fat_clusters
- FAT_START_ENT
);
1374 if (total_clusters
> MAX_FAT(sb
)) {
1376 printk(KERN_ERR
"FAT: count of clusters too big (%u)\n",
1382 sbi
->max_cluster
= total_clusters
+ FAT_START_ENT
;
1383 /* check the free_clusters, it's not necessarily correct */
1384 if (sbi
->free_clusters
!= -1 && sbi
->free_clusters
> total_clusters
)
1385 sbi
->free_clusters
= -1;
1386 /* check the prev_free, it's not necessarily correct */
1387 sbi
->prev_free
%= sbi
->max_cluster
;
1388 if (sbi
->prev_free
< FAT_START_ENT
)
1389 sbi
->prev_free
= FAT_START_ENT
;
1393 /* set up enough so that it can read an inode */
1395 fat_ent_access_init(sb
);
1398 * The low byte of FAT's first entry must have same value with
1399 * media-field. But in real world, too many devices is
1400 * writing wrong value. So, removed that validity check.
1402 * if (FAT_FIRST_ENT(sb, media) != first)
1406 sprintf(buf
, "cp%d", sbi
->options
.codepage
);
1407 sbi
->nls_disk
= load_nls(buf
);
1408 if (!sbi
->nls_disk
) {
1409 printk(KERN_ERR
"FAT: codepage %s not found\n", buf
);
1413 /* FIXME: utf8 is using iocharset for upper/lower conversion */
1414 if (sbi
->options
.isvfat
) {
1415 sbi
->nls_io
= load_nls(sbi
->options
.iocharset
);
1417 printk(KERN_ERR
"FAT: IO charset %s not found\n",
1418 sbi
->options
.iocharset
);
1424 root_inode
= new_inode(sb
);
1427 root_inode
->i_ino
= MSDOS_ROOT_INO
;
1428 root_inode
->i_version
= 1;
1429 error
= fat_read_root(root_inode
);
1433 insert_inode_hash(root_inode
);
1434 sb
->s_root
= d_alloc_root(root_inode
);
1436 printk(KERN_ERR
"FAT: get root inode failed\n");
1445 printk(KERN_INFO
"VFS: Can't find a valid FAT filesystem"
1446 " on dev %s.\n", sb
->s_id
);
1452 unload_nls(sbi
->nls_io
);
1454 unload_nls(sbi
->nls_disk
);
1455 if (sbi
->options
.iocharset
!= fat_default_iocharset
)
1456 kfree(sbi
->options
.iocharset
);
1457 sb
->s_fs_info
= NULL
;
1462 EXPORT_SYMBOL_GPL(fat_fill_super
);
1465 * helper function for fat_flush_inodes. This writes both the inode
1466 * and the file data blocks, waiting for in flight data blocks before
1467 * the start of the call. It does not wait for any io started
1470 static int writeback_inode(struct inode
*inode
)
1474 struct address_space
*mapping
= inode
->i_mapping
;
1475 struct writeback_control wbc
= {
1476 .sync_mode
= WB_SYNC_NONE
,
1479 /* if we used WB_SYNC_ALL, sync_inode waits for the io for the
1480 * inode to finish. So WB_SYNC_NONE is sent down to sync_inode
1481 * and filemap_fdatawrite is used for the data blocks
1483 ret
= sync_inode(inode
, &wbc
);
1485 ret
= filemap_fdatawrite(mapping
);
1490 * write data and metadata corresponding to i1 and i2. The io is
1491 * started but we do not wait for any of it to finish.
1493 * filemap_flush is used for the block device, so if there is a dirty
1494 * page for a block already in flight, we will not wait and start the
1497 int fat_flush_inodes(struct super_block
*sb
, struct inode
*i1
, struct inode
*i2
)
1500 if (!MSDOS_SB(sb
)->options
.flush
)
1503 ret
= writeback_inode(i1
);
1505 ret
= writeback_inode(i2
);
1507 struct address_space
*mapping
= sb
->s_bdev
->bd_inode
->i_mapping
;
1508 ret
= filemap_flush(mapping
);
1512 EXPORT_SYMBOL_GPL(fat_flush_inodes
);
1514 static int __init
init_fat_fs(void)
1518 err
= fat_cache_init();
1522 err
= fat_init_inodecache();
1529 fat_cache_destroy();
1533 static void __exit
exit_fat_fs(void)
1535 fat_cache_destroy();
1536 fat_destroy_inodecache();
1539 module_init(init_fat_fs
)
1540 module_exit(exit_fat_fs
)
1542 MODULE_LICENSE("GPL");