4 * Written 1992,1993 by Werner Almesberger
5 * VFAT extensions by Gordon Chaffee, merged with msdos fs by Henrik Storner
6 * Rewritten for the constant inumbers support by Al Viro
10 * Max Cohan: Fixed invalid FSINFO offset when info_sector is 0
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/time.h>
16 #include <linux/slab.h>
17 #include <linux/smp_lock.h>
18 #include <linux/seq_file.h>
19 #include <linux/msdos_fs.h>
20 #include <linux/pagemap.h>
21 #include <linux/mpage.h>
22 #include <linux/buffer_head.h>
23 #include <linux/exportfs.h>
24 #include <linux/mount.h>
25 #include <linux/vfs.h>
26 #include <linux/parser.h>
27 #include <linux/uio.h>
28 #include <linux/writeback.h>
29 #include <linux/log2.h>
30 #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
);
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_panic(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
);
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 int fat_prepare_write(struct file
*file
, struct page
*page
,
145 unsigned from
, unsigned to
)
147 return cont_prepare_write(page
, from
, to
, fat_get_block
,
148 &MSDOS_I(page
->mapping
->host
)->mmu_private
);
151 static int fat_commit_write(struct file
*file
, struct page
*page
,
152 unsigned from
, unsigned to
)
154 struct inode
*inode
= page
->mapping
->host
;
155 int err
= generic_commit_write(file
, page
, from
, to
);
156 if (!err
&& !(MSDOS_I(inode
)->i_attrs
& ATTR_ARCH
)) {
157 inode
->i_mtime
= inode
->i_ctime
= CURRENT_TIME_SEC
;
158 MSDOS_I(inode
)->i_attrs
|= ATTR_ARCH
;
159 mark_inode_dirty(inode
);
164 static ssize_t
fat_direct_IO(int rw
, struct kiocb
*iocb
,
165 const struct iovec
*iov
,
166 loff_t offset
, unsigned long nr_segs
)
168 struct file
*file
= iocb
->ki_filp
;
169 struct inode
*inode
= file
->f_mapping
->host
;
173 * FIXME: blockdev_direct_IO() doesn't use ->prepare_write(),
174 * so we need to update the ->mmu_private to block boundary.
176 * But we must fill the remaining area or hole by nul for
177 * updating ->mmu_private.
179 * Return 0, and fallback to normal buffered write.
181 loff_t size
= offset
+ iov_length(iov
, nr_segs
);
182 if (MSDOS_I(inode
)->mmu_private
< size
)
187 * FAT need to use the DIO_LOCKING for avoiding the race
188 * condition of fat_get_block() and ->truncate().
190 return blockdev_direct_IO(rw
, iocb
, inode
, inode
->i_sb
->s_bdev
, iov
,
191 offset
, nr_segs
, fat_get_block
, NULL
);
194 static sector_t
_fat_bmap(struct address_space
*mapping
, sector_t block
)
196 return generic_block_bmap(mapping
, block
, fat_get_block
);
199 static const struct address_space_operations fat_aops
= {
200 .readpage
= fat_readpage
,
201 .readpages
= fat_readpages
,
202 .writepage
= fat_writepage
,
203 .writepages
= fat_writepages
,
204 .sync_page
= block_sync_page
,
205 .prepare_write
= fat_prepare_write
,
206 .commit_write
= fat_commit_write
,
207 .direct_IO
= fat_direct_IO
,
212 * New FAT inode stuff. We do the following:
213 * a) i_ino is constant and has nothing with on-disk location.
214 * b) FAT manages its own cache of directory entries.
215 * c) *This* cache is indexed by on-disk location.
216 * d) inode has an associated directory entry, all right, but
217 * it may be unhashed.
218 * e) currently entries are stored within struct inode. That should
220 * f) we deal with races in the following way:
221 * 1. readdir() and lookup() do FAT-dir-cache lookup.
222 * 2. rename() unhashes the F-d-c entry and rehashes it in
224 * 3. unlink() and rmdir() unhash F-d-c entry.
225 * 4. fat_write_inode() checks whether the thing is unhashed.
226 * If it is we silently return. If it isn't we do bread(),
227 * check if the location is still valid and retry if it
228 * isn't. Otherwise we do changes.
229 * 5. Spinlock is used to protect hash/unhash/location check/lookup
230 * 6. fat_clear_inode() unhashes the F-d-c entry.
231 * 7. lookup() and readdir() do igrab() if they find a F-d-c entry
232 * and consider negative result as cache miss.
235 static void fat_hash_init(struct super_block
*sb
)
237 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
240 spin_lock_init(&sbi
->inode_hash_lock
);
241 for (i
= 0; i
< FAT_HASH_SIZE
; i
++)
242 INIT_HLIST_HEAD(&sbi
->inode_hashtable
[i
]);
245 static inline unsigned long fat_hash(struct super_block
*sb
, loff_t i_pos
)
247 unsigned long tmp
= (unsigned long)i_pos
| (unsigned long) sb
;
248 tmp
= tmp
+ (tmp
>> FAT_HASH_BITS
) + (tmp
>> FAT_HASH_BITS
* 2);
249 return tmp
& FAT_HASH_MASK
;
252 void fat_attach(struct inode
*inode
, loff_t i_pos
)
254 struct super_block
*sb
= inode
->i_sb
;
255 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
257 spin_lock(&sbi
->inode_hash_lock
);
258 MSDOS_I(inode
)->i_pos
= i_pos
;
259 hlist_add_head(&MSDOS_I(inode
)->i_fat_hash
,
260 sbi
->inode_hashtable
+ fat_hash(sb
, i_pos
));
261 spin_unlock(&sbi
->inode_hash_lock
);
264 EXPORT_SYMBOL_GPL(fat_attach
);
266 void fat_detach(struct inode
*inode
)
268 struct msdos_sb_info
*sbi
= MSDOS_SB(inode
->i_sb
);
269 spin_lock(&sbi
->inode_hash_lock
);
270 MSDOS_I(inode
)->i_pos
= 0;
271 hlist_del_init(&MSDOS_I(inode
)->i_fat_hash
);
272 spin_unlock(&sbi
->inode_hash_lock
);
275 EXPORT_SYMBOL_GPL(fat_detach
);
277 struct inode
*fat_iget(struct super_block
*sb
, loff_t i_pos
)
279 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
280 struct hlist_head
*head
= sbi
->inode_hashtable
+ fat_hash(sb
, i_pos
);
281 struct hlist_node
*_p
;
282 struct msdos_inode_info
*i
;
283 struct inode
*inode
= NULL
;
285 spin_lock(&sbi
->inode_hash_lock
);
286 hlist_for_each_entry(i
, _p
, head
, i_fat_hash
) {
287 BUG_ON(i
->vfs_inode
.i_sb
!= sb
);
288 if (i
->i_pos
!= i_pos
)
290 inode
= igrab(&i
->vfs_inode
);
294 spin_unlock(&sbi
->inode_hash_lock
);
298 static int is_exec(unsigned char *extension
)
300 unsigned char *exe_extensions
= "EXECOMBAT", *walk
;
302 for (walk
= exe_extensions
; *walk
; walk
+= 3)
303 if (!strncmp(extension
, walk
, 3))
308 static int fat_calc_dir_size(struct inode
*inode
)
310 struct msdos_sb_info
*sbi
= MSDOS_SB(inode
->i_sb
);
311 int ret
, fclus
, dclus
;
314 if (MSDOS_I(inode
)->i_start
== 0)
317 ret
= fat_get_cluster(inode
, FAT_ENT_EOF
, &fclus
, &dclus
);
320 inode
->i_size
= (fclus
+ 1) << sbi
->cluster_bits
;
325 /* doesn't deal with root inode */
326 static int fat_fill_inode(struct inode
*inode
, struct msdos_dir_entry
*de
)
328 struct msdos_sb_info
*sbi
= MSDOS_SB(inode
->i_sb
);
331 MSDOS_I(inode
)->i_pos
= 0;
332 inode
->i_uid
= sbi
->options
.fs_uid
;
333 inode
->i_gid
= sbi
->options
.fs_gid
;
335 inode
->i_generation
= get_seconds();
337 if ((de
->attr
& ATTR_DIR
) && !IS_FREE(de
->name
)) {
338 inode
->i_generation
&= ~1;
339 inode
->i_mode
= MSDOS_MKMODE(de
->attr
,
340 S_IRWXUGO
& ~sbi
->options
.fs_dmask
) | S_IFDIR
;
341 inode
->i_op
= sbi
->dir_ops
;
342 inode
->i_fop
= &fat_dir_operations
;
344 MSDOS_I(inode
)->i_start
= le16_to_cpu(de
->start
);
345 if (sbi
->fat_bits
== 32)
346 MSDOS_I(inode
)->i_start
|= (le16_to_cpu(de
->starthi
) << 16);
348 MSDOS_I(inode
)->i_logstart
= MSDOS_I(inode
)->i_start
;
349 error
= fat_calc_dir_size(inode
);
352 MSDOS_I(inode
)->mmu_private
= inode
->i_size
;
354 inode
->i_nlink
= fat_subdirs(inode
);
355 } else { /* not a directory */
356 inode
->i_generation
|= 1;
357 inode
->i_mode
= MSDOS_MKMODE(de
->attr
,
358 ((sbi
->options
.showexec
&& !is_exec(de
->name
+ 8))
359 ? S_IRUGO
|S_IWUGO
: S_IRWXUGO
)
360 & ~sbi
->options
.fs_fmask
) | S_IFREG
;
361 MSDOS_I(inode
)->i_start
= le16_to_cpu(de
->start
);
362 if (sbi
->fat_bits
== 32)
363 MSDOS_I(inode
)->i_start
|= (le16_to_cpu(de
->starthi
) << 16);
365 MSDOS_I(inode
)->i_logstart
= MSDOS_I(inode
)->i_start
;
366 inode
->i_size
= le32_to_cpu(de
->size
);
367 inode
->i_op
= &fat_file_inode_operations
;
368 inode
->i_fop
= &fat_file_operations
;
369 inode
->i_mapping
->a_ops
= &fat_aops
;
370 MSDOS_I(inode
)->mmu_private
= inode
->i_size
;
372 if (de
->attr
& ATTR_SYS
) {
373 if (sbi
->options
.sys_immutable
)
374 inode
->i_flags
|= S_IMMUTABLE
;
376 MSDOS_I(inode
)->i_attrs
= de
->attr
& ATTR_UNUSED
;
377 inode
->i_blocks
= ((inode
->i_size
+ (sbi
->cluster_size
- 1))
378 & ~((loff_t
)sbi
->cluster_size
- 1)) >> 9;
379 inode
->i_mtime
.tv_sec
=
380 date_dos2unix(le16_to_cpu(de
->time
), le16_to_cpu(de
->date
));
381 inode
->i_mtime
.tv_nsec
= 0;
382 if (sbi
->options
.isvfat
) {
383 int secs
= de
->ctime_cs
/ 100;
384 int csecs
= de
->ctime_cs
% 100;
385 inode
->i_ctime
.tv_sec
=
386 date_dos2unix(le16_to_cpu(de
->ctime
),
387 le16_to_cpu(de
->cdate
)) + secs
;
388 inode
->i_ctime
.tv_nsec
= csecs
* 10000000;
389 inode
->i_atime
.tv_sec
=
390 date_dos2unix(0, le16_to_cpu(de
->adate
));
391 inode
->i_atime
.tv_nsec
= 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);
432 if (!is_bad_inode(inode
)) {
439 static void fat_clear_inode(struct inode
*inode
)
441 struct msdos_sb_info
*sbi
= MSDOS_SB(inode
->i_sb
);
443 if (is_bad_inode(inode
))
446 spin_lock(&sbi
->inode_hash_lock
);
447 fat_cache_inval_inode(inode
);
448 hlist_del_init(&MSDOS_I(inode
)->i_fat_hash
);
449 spin_unlock(&sbi
->inode_hash_lock
);
453 static void fat_write_super(struct super_block
*sb
)
457 if (!(sb
->s_flags
& MS_RDONLY
))
458 fat_clusters_flush(sb
);
461 static void fat_put_super(struct super_block
*sb
)
463 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
466 unload_nls(sbi
->nls_disk
);
467 sbi
->nls_disk
= NULL
;
468 sbi
->options
.codepage
= fat_default_codepage
;
471 unload_nls(sbi
->nls_io
);
474 if (sbi
->options
.iocharset
!= fat_default_iocharset
) {
475 kfree(sbi
->options
.iocharset
);
476 sbi
->options
.iocharset
= fat_default_iocharset
;
479 sb
->s_fs_info
= NULL
;
483 static struct kmem_cache
*fat_inode_cachep
;
485 static struct inode
*fat_alloc_inode(struct super_block
*sb
)
487 struct msdos_inode_info
*ei
;
488 ei
= kmem_cache_alloc(fat_inode_cachep
, GFP_KERNEL
);
491 return &ei
->vfs_inode
;
494 static void fat_destroy_inode(struct inode
*inode
)
496 kmem_cache_free(fat_inode_cachep
, MSDOS_I(inode
));
499 static void init_once(void * foo
, struct kmem_cache
* cachep
, unsigned long flags
)
501 struct msdos_inode_info
*ei
= (struct msdos_inode_info
*)foo
;
503 spin_lock_init(&ei
->cache_lru_lock
);
505 ei
->cache_valid_id
= FAT_CACHE_VALID
+ 1;
506 INIT_LIST_HEAD(&ei
->cache_lru
);
507 INIT_HLIST_NODE(&ei
->i_fat_hash
);
508 inode_init_once(&ei
->vfs_inode
);
511 static int __init
fat_init_inodecache(void)
513 fat_inode_cachep
= kmem_cache_create("fat_inode_cache",
514 sizeof(struct msdos_inode_info
),
515 0, (SLAB_RECLAIM_ACCOUNT
|
518 if (fat_inode_cachep
== NULL
)
523 static void __exit
fat_destroy_inodecache(void)
525 kmem_cache_destroy(fat_inode_cachep
);
528 static int fat_remount(struct super_block
*sb
, int *flags
, char *data
)
530 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
531 *flags
|= MS_NODIRATIME
| (sbi
->options
.isvfat
? 0 : MS_NOATIME
);
535 static int fat_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
537 struct msdos_sb_info
*sbi
= MSDOS_SB(dentry
->d_sb
);
539 /* If the count of free cluster is still unknown, counts it here. */
540 if (sbi
->free_clusters
== -1) {
541 int err
= fat_count_free_clusters(dentry
->d_sb
);
546 buf
->f_type
= dentry
->d_sb
->s_magic
;
547 buf
->f_bsize
= sbi
->cluster_size
;
548 buf
->f_blocks
= sbi
->max_cluster
- FAT_START_ENT
;
549 buf
->f_bfree
= sbi
->free_clusters
;
550 buf
->f_bavail
= sbi
->free_clusters
;
551 buf
->f_namelen
= sbi
->options
.isvfat
? 260 : 12;
556 static int fat_write_inode(struct inode
*inode
, int wait
)
558 struct super_block
*sb
= inode
->i_sb
;
559 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
560 struct buffer_head
*bh
;
561 struct msdos_dir_entry
*raw_entry
;
566 i_pos
= MSDOS_I(inode
)->i_pos
;
567 if (inode
->i_ino
== MSDOS_ROOT_INO
|| !i_pos
)
571 bh
= sb_bread(sb
, i_pos
>> sbi
->dir_per_block_bits
);
573 printk(KERN_ERR
"FAT: unable to read inode block "
574 "for updating (i_pos %lld)\n", i_pos
);
578 spin_lock(&sbi
->inode_hash_lock
);
579 if (i_pos
!= MSDOS_I(inode
)->i_pos
) {
580 spin_unlock(&sbi
->inode_hash_lock
);
586 raw_entry
= &((struct msdos_dir_entry
*) (bh
->b_data
))
587 [i_pos
& (sbi
->dir_per_block
- 1)];
588 if (S_ISDIR(inode
->i_mode
))
591 raw_entry
->size
= cpu_to_le32(inode
->i_size
);
592 raw_entry
->attr
= fat_attr(inode
);
593 raw_entry
->start
= cpu_to_le16(MSDOS_I(inode
)->i_logstart
);
594 raw_entry
->starthi
= cpu_to_le16(MSDOS_I(inode
)->i_logstart
>> 16);
595 fat_date_unix2dos(inode
->i_mtime
.tv_sec
, &raw_entry
->time
, &raw_entry
->date
);
596 if (sbi
->options
.isvfat
) {
598 fat_date_unix2dos(inode
->i_ctime
.tv_sec
,&raw_entry
->ctime
,&raw_entry
->cdate
);
599 fat_date_unix2dos(inode
->i_atime
.tv_sec
,&atime
,&raw_entry
->adate
);
600 raw_entry
->ctime_cs
= (inode
->i_ctime
.tv_sec
& 1) * 100 +
601 inode
->i_ctime
.tv_nsec
/ 10000000;
603 spin_unlock(&sbi
->inode_hash_lock
);
604 mark_buffer_dirty(bh
);
606 err
= sync_dirty_buffer(bh
);
613 int fat_sync_inode(struct inode
*inode
)
615 return fat_write_inode(inode
, 1);
618 EXPORT_SYMBOL_GPL(fat_sync_inode
);
620 static int fat_show_options(struct seq_file
*m
, struct vfsmount
*mnt
);
621 static const struct super_operations fat_sops
= {
622 .alloc_inode
= fat_alloc_inode
,
623 .destroy_inode
= fat_destroy_inode
,
624 .write_inode
= fat_write_inode
,
625 .delete_inode
= fat_delete_inode
,
626 .put_super
= fat_put_super
,
627 .write_super
= fat_write_super
,
628 .statfs
= fat_statfs
,
629 .clear_inode
= fat_clear_inode
,
630 .remount_fs
= fat_remount
,
632 .read_inode
= make_bad_inode
,
634 .show_options
= fat_show_options
,
638 * a FAT file handle with fhtype 3 is
639 * 0/ i_ino - for fast, reliable lookup if still in the cache
640 * 1/ i_generation - to see if i_ino is still valid
641 * bit 0 == 0 iff directory
642 * 2/ i_pos(8-39) - if ino has changed, but still in cache
643 * 3/ i_pos(4-7)|i_logstart - to semi-verify inode found at i_pos
644 * 4/ i_pos(0-3)|parent->i_logstart - maybe used to hunt for the file on disc
646 * Hack for NFSv2: Maximum FAT entry number is 28bits and maximum
647 * i_pos is 40bits (blocknr(32) + dir offset(8)), so two 4bits
648 * of i_logstart is used to store the directory entry offset.
651 static struct dentry
*
652 fat_decode_fh(struct super_block
*sb
, __u32
*fh
, int len
, int fhtype
,
653 int (*acceptable
)(void *context
, struct dentry
*de
),
657 return ERR_PTR(-ESTALE
);
659 return ERR_PTR(-ESTALE
);
661 return sb
->s_export_op
->find_exported_dentry(sb
, fh
, NULL
, acceptable
, context
);
664 static struct dentry
*fat_get_dentry(struct super_block
*sb
, void *inump
)
666 struct inode
*inode
= NULL
;
667 struct dentry
*result
;
670 inode
= iget(sb
, fh
[0]);
671 if (!inode
|| is_bad_inode(inode
) || inode
->i_generation
!= fh
[1]) {
678 int i_logstart
= fh
[3] & 0x0fffffff;
680 i_pos
= (loff_t
)fh
[2] << 8;
681 i_pos
|= ((fh
[3] >> 24) & 0xf0) | (fh
[4] >> 28);
683 /* try 2 - see if i_pos is in F-d-c
684 * require i_logstart to be the same
685 * Will fail if you truncate and then re-write
688 inode
= fat_iget(sb
, i_pos
);
689 if (inode
&& MSDOS_I(inode
)->i_logstart
!= i_logstart
) {
695 /* For now, do nothing
696 * What we could do is:
697 * follow the file starting at fh[4], and record
698 * the ".." entry, and the name of the fh[2] entry.
699 * The follow the ".." file finding the next step up.
700 * This way we build a path to the root of
701 * the tree. If this works, we lookup the path and so
702 * get this inode into the cache.
703 * Finally try the fat_iget lookup again
704 * If that fails, then weare totally out of luck
705 * But all that is for another day
709 return ERR_PTR(-ESTALE
);
712 /* now to find a dentry.
713 * If possible, get a well-connected one
715 result
= d_alloc_anon(inode
);
716 if (result
== NULL
) {
718 return ERR_PTR(-ENOMEM
);
720 result
->d_op
= sb
->s_root
->d_op
;
725 fat_encode_fh(struct dentry
*de
, __u32
*fh
, int *lenp
, int connectable
)
728 struct inode
*inode
= de
->d_inode
;
729 u32 ipos_h
, ipos_m
, ipos_l
;
732 return 255; /* no room */
734 ipos_h
= MSDOS_I(inode
)->i_pos
>> 8;
735 ipos_m
= (MSDOS_I(inode
)->i_pos
& 0xf0) << 24;
736 ipos_l
= (MSDOS_I(inode
)->i_pos
& 0x0f) << 28;
738 fh
[0] = inode
->i_ino
;
739 fh
[1] = inode
->i_generation
;
741 fh
[3] = ipos_m
| MSDOS_I(inode
)->i_logstart
;
742 spin_lock(&de
->d_lock
);
743 fh
[4] = ipos_l
| MSDOS_I(de
->d_parent
->d_inode
)->i_logstart
;
744 spin_unlock(&de
->d_lock
);
748 static struct dentry
*fat_get_parent(struct dentry
*child
)
750 struct buffer_head
*bh
;
751 struct msdos_dir_entry
*de
;
753 struct dentry
*parent
;
759 err
= fat_get_dotdot_entry(child
->d_inode
, &bh
, &de
, &i_pos
);
761 parent
= ERR_PTR(err
);
764 inode
= fat_build_inode(child
->d_sb
, de
, i_pos
);
767 parent
= ERR_PTR(PTR_ERR(inode
));
770 parent
= d_alloc_anon(inode
);
773 parent
= ERR_PTR(-ENOMEM
);
781 static struct export_operations fat_export_ops
= {
782 .decode_fh
= fat_decode_fh
,
783 .encode_fh
= fat_encode_fh
,
784 .get_dentry
= fat_get_dentry
,
785 .get_parent
= fat_get_parent
,
788 static int fat_show_options(struct seq_file
*m
, struct vfsmount
*mnt
)
790 struct msdos_sb_info
*sbi
= MSDOS_SB(mnt
->mnt_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
);
801 seq_printf(m
, ",codepage=%s", sbi
->nls_disk
->charset
);
804 seq_printf(m
, ",iocharset=%s", sbi
->nls_io
->charset
);
806 switch (opts
->shortname
) {
807 case VFAT_SFN_DISPLAY_WIN95
| VFAT_SFN_CREATE_WIN95
:
808 seq_puts(m
, ",shortname=win95");
810 case VFAT_SFN_DISPLAY_WINNT
| VFAT_SFN_CREATE_WINNT
:
811 seq_puts(m
, ",shortname=winnt");
813 case VFAT_SFN_DISPLAY_WINNT
| VFAT_SFN_CREATE_WIN95
:
814 seq_puts(m
, ",shortname=mixed");
816 case VFAT_SFN_DISPLAY_LOWER
| VFAT_SFN_CREATE_WIN95
:
817 /* seq_puts(m, ",shortname=lower"); */
820 seq_puts(m
, ",shortname=unknown");
824 if (opts
->name_check
!= 'n')
825 seq_printf(m
, ",check=%c", opts
->name_check
);
827 seq_puts(m
, ",usefree");
829 seq_puts(m
, ",quiet");
831 seq_puts(m
, ",showexec");
832 if (opts
->sys_immutable
)
833 seq_puts(m
, ",sys_immutable");
836 seq_puts(m
, ",dotsOK=yes");
838 seq_puts(m
, ",nocase");
841 seq_puts(m
, ",utf8");
842 if (opts
->unicode_xlate
)
843 seq_puts(m
, ",uni_xlate");
845 seq_puts(m
, ",nonumtail");
852 Opt_check_n
, Opt_check_r
, Opt_check_s
, Opt_uid
, Opt_gid
,
853 Opt_umask
, Opt_dmask
, Opt_fmask
, Opt_codepage
, Opt_usefree
, Opt_nocase
,
854 Opt_quiet
, Opt_showexec
, Opt_debug
, Opt_immutable
,
855 Opt_dots
, Opt_nodots
,
856 Opt_charset
, Opt_shortname_lower
, Opt_shortname_win95
,
857 Opt_shortname_winnt
, Opt_shortname_mixed
, Opt_utf8_no
, Opt_utf8_yes
,
858 Opt_uni_xl_no
, Opt_uni_xl_yes
, Opt_nonumtail_no
, Opt_nonumtail_yes
,
859 Opt_obsolate
, Opt_flush
, Opt_err
,
862 static match_table_t fat_tokens
= {
863 {Opt_check_r
, "check=relaxed"},
864 {Opt_check_s
, "check=strict"},
865 {Opt_check_n
, "check=normal"},
866 {Opt_check_r
, "check=r"},
867 {Opt_check_s
, "check=s"},
868 {Opt_check_n
, "check=n"},
871 {Opt_umask
, "umask=%o"},
872 {Opt_dmask
, "dmask=%o"},
873 {Opt_fmask
, "fmask=%o"},
874 {Opt_codepage
, "codepage=%u"},
875 {Opt_usefree
, "usefree"},
876 {Opt_nocase
, "nocase"},
877 {Opt_quiet
, "quiet"},
878 {Opt_showexec
, "showexec"},
879 {Opt_debug
, "debug"},
880 {Opt_immutable
, "sys_immutable"},
881 {Opt_obsolate
, "conv=binary"},
882 {Opt_obsolate
, "conv=text"},
883 {Opt_obsolate
, "conv=auto"},
884 {Opt_obsolate
, "conv=b"},
885 {Opt_obsolate
, "conv=t"},
886 {Opt_obsolate
, "conv=a"},
887 {Opt_obsolate
, "fat=%u"},
888 {Opt_obsolate
, "blocksize=%u"},
889 {Opt_obsolate
, "cvf_format=%20s"},
890 {Opt_obsolate
, "cvf_options=%100s"},
891 {Opt_obsolate
, "posix"},
892 {Opt_flush
, "flush"},
895 static match_table_t msdos_tokens
= {
896 {Opt_nodots
, "nodots"},
897 {Opt_nodots
, "dotsOK=no"},
899 {Opt_dots
, "dotsOK=yes"},
902 static match_table_t vfat_tokens
= {
903 {Opt_charset
, "iocharset=%s"},
904 {Opt_shortname_lower
, "shortname=lower"},
905 {Opt_shortname_win95
, "shortname=win95"},
906 {Opt_shortname_winnt
, "shortname=winnt"},
907 {Opt_shortname_mixed
, "shortname=mixed"},
908 {Opt_utf8_no
, "utf8=0"}, /* 0 or no or false */
909 {Opt_utf8_no
, "utf8=no"},
910 {Opt_utf8_no
, "utf8=false"},
911 {Opt_utf8_yes
, "utf8=1"}, /* empty or 1 or yes or true */
912 {Opt_utf8_yes
, "utf8=yes"},
913 {Opt_utf8_yes
, "utf8=true"},
914 {Opt_utf8_yes
, "utf8"},
915 {Opt_uni_xl_no
, "uni_xlate=0"}, /* 0 or no or false */
916 {Opt_uni_xl_no
, "uni_xlate=no"},
917 {Opt_uni_xl_no
, "uni_xlate=false"},
918 {Opt_uni_xl_yes
, "uni_xlate=1"}, /* empty or 1 or yes or true */
919 {Opt_uni_xl_yes
, "uni_xlate=yes"},
920 {Opt_uni_xl_yes
, "uni_xlate=true"},
921 {Opt_uni_xl_yes
, "uni_xlate"},
922 {Opt_nonumtail_no
, "nonumtail=0"}, /* 0 or no or false */
923 {Opt_nonumtail_no
, "nonumtail=no"},
924 {Opt_nonumtail_no
, "nonumtail=false"},
925 {Opt_nonumtail_yes
, "nonumtail=1"}, /* empty or 1 or yes or true */
926 {Opt_nonumtail_yes
, "nonumtail=yes"},
927 {Opt_nonumtail_yes
, "nonumtail=true"},
928 {Opt_nonumtail_yes
, "nonumtail"},
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
= opts
->fs_dmask
= current
->fs
->umask
;
945 opts
->codepage
= fat_default_codepage
;
946 opts
->iocharset
= fat_default_iocharset
;
948 opts
->shortname
= VFAT_SFN_DISPLAY_LOWER
|VFAT_SFN_CREATE_WIN95
;
951 opts
->name_check
= 'n';
952 opts
->quiet
= opts
->showexec
= opts
->sys_immutable
= opts
->dotsOK
= 0;
953 opts
->utf8
= opts
->unicode_xlate
= 0;
955 opts
->usefree
= opts
->nocase
= 0;
961 while ((p
= strsep(&options
, ",")) != NULL
) {
966 token
= match_token(p
, fat_tokens
, args
);
967 if (token
== Opt_err
) {
969 token
= match_token(p
, vfat_tokens
, args
);
971 token
= match_token(p
, msdos_tokens
, args
);
975 opts
->name_check
= 's';
978 opts
->name_check
= 'r';
981 opts
->name_check
= 'n';
990 /* for backward compatibility */
991 opts
->shortname
= VFAT_SFN_DISPLAY_WIN95
992 | VFAT_SFN_CREATE_WIN95
;
1005 opts
->sys_immutable
= 1;
1008 if (match_int(&args
[0], &option
))
1010 opts
->fs_uid
= option
;
1013 if (match_int(&args
[0], &option
))
1015 opts
->fs_gid
= option
;
1018 if (match_octal(&args
[0], &option
))
1020 opts
->fs_fmask
= opts
->fs_dmask
= option
;
1023 if (match_octal(&args
[0], &option
))
1025 opts
->fs_dmask
= option
;
1028 if (match_octal(&args
[0], &option
))
1030 opts
->fs_fmask
= option
;
1033 if (match_int(&args
[0], &option
))
1035 opts
->codepage
= option
;
1041 /* msdos specific */
1051 if (opts
->iocharset
!= fat_default_iocharset
)
1052 kfree(opts
->iocharset
);
1053 iocharset
= match_strdup(&args
[0]);
1056 opts
->iocharset
= iocharset
;
1058 case Opt_shortname_lower
:
1059 opts
->shortname
= VFAT_SFN_DISPLAY_LOWER
1060 | VFAT_SFN_CREATE_WIN95
;
1062 case Opt_shortname_win95
:
1063 opts
->shortname
= VFAT_SFN_DISPLAY_WIN95
1064 | VFAT_SFN_CREATE_WIN95
;
1066 case Opt_shortname_winnt
:
1067 opts
->shortname
= VFAT_SFN_DISPLAY_WINNT
1068 | VFAT_SFN_CREATE_WINNT
;
1070 case Opt_shortname_mixed
:
1071 opts
->shortname
= VFAT_SFN_DISPLAY_WINNT
1072 | VFAT_SFN_CREATE_WIN95
;
1074 case Opt_utf8_no
: /* 0 or no or false */
1077 case Opt_utf8_yes
: /* empty or 1 or yes or true */
1080 case Opt_uni_xl_no
: /* 0 or no or false */
1081 opts
->unicode_xlate
= 0;
1083 case Opt_uni_xl_yes
: /* empty or 1 or yes or true */
1084 opts
->unicode_xlate
= 1;
1086 case Opt_nonumtail_no
: /* 0 or no or false */
1087 opts
->numtail
= 1; /* negated option */
1089 case Opt_nonumtail_yes
: /* empty or 1 or yes or true */
1090 opts
->numtail
= 0; /* negated option */
1093 /* obsolete mount options */
1095 printk(KERN_INFO
"FAT: \"%s\" option is obsolete, "
1096 "not supported now\n", p
);
1098 /* unknown option */
1102 "FAT: Unrecognized mount option \"%s\" "
1103 "or missing value\n", p
);
1108 /* UTF-8 doesn't provide FAT semantics */
1109 if (!strcmp(opts
->iocharset
, "utf8")) {
1110 printk(KERN_ERR
"FAT: utf8 is not a recommended IO charset"
1111 " for FAT filesystems, filesystem will be case sensitive!\n");
1114 if (opts
->unicode_xlate
)
1120 static int fat_read_root(struct inode
*inode
)
1122 struct super_block
*sb
= inode
->i_sb
;
1123 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
1126 MSDOS_I(inode
)->i_pos
= 0;
1127 inode
->i_uid
= sbi
->options
.fs_uid
;
1128 inode
->i_gid
= sbi
->options
.fs_gid
;
1130 inode
->i_generation
= 0;
1131 inode
->i_mode
= (S_IRWXUGO
& ~sbi
->options
.fs_dmask
) | S_IFDIR
;
1132 inode
->i_op
= sbi
->dir_ops
;
1133 inode
->i_fop
= &fat_dir_operations
;
1134 if (sbi
->fat_bits
== 32) {
1135 MSDOS_I(inode
)->i_start
= sbi
->root_cluster
;
1136 error
= fat_calc_dir_size(inode
);
1140 MSDOS_I(inode
)->i_start
= 0;
1141 inode
->i_size
= sbi
->dir_entries
* sizeof(struct msdos_dir_entry
);
1143 inode
->i_blocks
= ((inode
->i_size
+ (sbi
->cluster_size
- 1))
1144 & ~((loff_t
)sbi
->cluster_size
- 1)) >> 9;
1145 MSDOS_I(inode
)->i_logstart
= 0;
1146 MSDOS_I(inode
)->mmu_private
= inode
->i_size
;
1148 MSDOS_I(inode
)->i_attrs
= ATTR_NONE
;
1149 inode
->i_mtime
.tv_sec
= inode
->i_atime
.tv_sec
= inode
->i_ctime
.tv_sec
= 0;
1150 inode
->i_mtime
.tv_nsec
= inode
->i_atime
.tv_nsec
= inode
->i_ctime
.tv_nsec
= 0;
1151 inode
->i_nlink
= fat_subdirs(inode
)+2;
1157 * Read the super block of an MS-DOS FS.
1159 int fat_fill_super(struct super_block
*sb
, void *data
, int silent
,
1160 const struct inode_operations
*fs_dir_inode_ops
, int isvfat
)
1162 struct inode
*root_inode
= NULL
;
1163 struct buffer_head
*bh
;
1164 struct fat_boot_sector
*b
;
1165 struct msdos_sb_info
*sbi
;
1166 u16 logical_sector_size
;
1167 u32 total_sectors
, total_clusters
, fat_clusters
, rootdir_sectors
;
1173 sbi
= kzalloc(sizeof(struct msdos_sb_info
), GFP_KERNEL
);
1176 sb
->s_fs_info
= sbi
;
1178 sb
->s_flags
|= MS_NODIRATIME
;
1179 sb
->s_magic
= MSDOS_SUPER_MAGIC
;
1180 sb
->s_op
= &fat_sops
;
1181 sb
->s_export_op
= &fat_export_ops
;
1182 sbi
->dir_ops
= fs_dir_inode_ops
;
1184 error
= parse_options(data
, isvfat
, silent
, &debug
, &sbi
->options
);
1189 sb_min_blocksize(sb
, 512);
1190 bh
= sb_bread(sb
, 0);
1192 printk(KERN_ERR
"FAT: unable to read boot sector\n");
1196 b
= (struct fat_boot_sector
*) bh
->b_data
;
1199 printk(KERN_ERR
"FAT: bogus number of reserved sectors\n");
1205 printk(KERN_ERR
"FAT: bogus number of FAT structure\n");
1211 * Earlier we checked here that b->secs_track and b->head are nonzero,
1212 * but it turns out valid FAT filesystems can have zero there.
1216 if (!FAT_VALID_MEDIA(media
)) {
1218 printk(KERN_ERR
"FAT: invalid media value (0x%02x)\n",
1223 logical_sector_size
=
1224 le16_to_cpu(get_unaligned((__le16
*)&b
->sector_size
));
1225 if (!is_power_of_2(logical_sector_size
)
1226 || (logical_sector_size
< 512)
1227 || (PAGE_CACHE_SIZE
< logical_sector_size
)) {
1229 printk(KERN_ERR
"FAT: bogus logical sector size %u\n",
1230 logical_sector_size
);
1234 sbi
->sec_per_clus
= b
->sec_per_clus
;
1235 if (!is_power_of_2(sbi
->sec_per_clus
)) {
1237 printk(KERN_ERR
"FAT: bogus sectors per cluster %u\n",
1243 if (logical_sector_size
< sb
->s_blocksize
) {
1244 printk(KERN_ERR
"FAT: logical sector size too small for device"
1245 " (logical sector size = %u)\n", logical_sector_size
);
1249 if (logical_sector_size
> sb
->s_blocksize
) {
1252 if (!sb_set_blocksize(sb
, logical_sector_size
)) {
1253 printk(KERN_ERR
"FAT: unable to set blocksize %u\n",
1254 logical_sector_size
);
1257 bh
= sb_bread(sb
, 0);
1259 printk(KERN_ERR
"FAT: unable to read boot sector"
1260 " (logical sector size = %lu)\n",
1264 b
= (struct fat_boot_sector
*) bh
->b_data
;
1267 sbi
->cluster_size
= sb
->s_blocksize
* sbi
->sec_per_clus
;
1268 sbi
->cluster_bits
= ffs(sbi
->cluster_size
) - 1;
1269 sbi
->fats
= b
->fats
;
1270 sbi
->fat_bits
= 0; /* Don't know yet */
1271 sbi
->fat_start
= le16_to_cpu(b
->reserved
);
1272 sbi
->fat_length
= le16_to_cpu(b
->fat_length
);
1273 sbi
->root_cluster
= 0;
1274 sbi
->free_clusters
= -1; /* Don't know yet */
1275 sbi
->prev_free
= FAT_START_ENT
;
1277 if (!sbi
->fat_length
&& b
->fat32_length
) {
1278 struct fat_boot_fsinfo
*fsinfo
;
1279 struct buffer_head
*fsinfo_bh
;
1283 sbi
->fat_length
= le32_to_cpu(b
->fat32_length
);
1284 sbi
->root_cluster
= le32_to_cpu(b
->root_cluster
);
1286 sb
->s_maxbytes
= 0xffffffff;
1288 /* MC - if info_sector is 0, don't multiply by 0 */
1289 sbi
->fsinfo_sector
= le16_to_cpu(b
->info_sector
);
1290 if (sbi
->fsinfo_sector
== 0)
1291 sbi
->fsinfo_sector
= 1;
1293 fsinfo_bh
= sb_bread(sb
, sbi
->fsinfo_sector
);
1294 if (fsinfo_bh
== NULL
) {
1295 printk(KERN_ERR
"FAT: bread failed, FSINFO block"
1296 " (sector = %lu)\n", sbi
->fsinfo_sector
);
1301 fsinfo
= (struct fat_boot_fsinfo
*)fsinfo_bh
->b_data
;
1302 if (!IS_FSINFO(fsinfo
)) {
1304 "FAT: Did not find valid FSINFO signature.\n"
1305 " Found signature1 0x%08x signature2 0x%08x"
1306 " (sector = %lu)\n",
1307 le32_to_cpu(fsinfo
->signature1
),
1308 le32_to_cpu(fsinfo
->signature2
),
1309 sbi
->fsinfo_sector
);
1311 if (sbi
->options
.usefree
)
1312 sbi
->free_clusters
=
1313 le32_to_cpu(fsinfo
->free_clusters
);
1314 sbi
->prev_free
= le32_to_cpu(fsinfo
->next_cluster
);
1320 sbi
->dir_per_block
= sb
->s_blocksize
/ sizeof(struct msdos_dir_entry
);
1321 sbi
->dir_per_block_bits
= ffs(sbi
->dir_per_block
) - 1;
1323 sbi
->dir_start
= sbi
->fat_start
+ sbi
->fats
* sbi
->fat_length
;
1325 le16_to_cpu(get_unaligned((__le16
*)&b
->dir_entries
));
1326 if (sbi
->dir_entries
& (sbi
->dir_per_block
- 1)) {
1328 printk(KERN_ERR
"FAT: bogus directroy-entries per block"
1329 " (%u)\n", sbi
->dir_entries
);
1334 rootdir_sectors
= sbi
->dir_entries
1335 * sizeof(struct msdos_dir_entry
) / sb
->s_blocksize
;
1336 sbi
->data_start
= sbi
->dir_start
+ rootdir_sectors
;
1337 total_sectors
= le16_to_cpu(get_unaligned((__le16
*)&b
->sectors
));
1338 if (total_sectors
== 0)
1339 total_sectors
= le32_to_cpu(b
->total_sect
);
1341 total_clusters
= (total_sectors
- sbi
->data_start
) / sbi
->sec_per_clus
;
1343 if (sbi
->fat_bits
!= 32)
1344 sbi
->fat_bits
= (total_clusters
> MAX_FAT12
) ? 16 : 12;
1346 /* check that FAT table does not overflow */
1347 fat_clusters
= sbi
->fat_length
* sb
->s_blocksize
* 8 / sbi
->fat_bits
;
1348 total_clusters
= min(total_clusters
, fat_clusters
- FAT_START_ENT
);
1349 if (total_clusters
> MAX_FAT(sb
)) {
1351 printk(KERN_ERR
"FAT: count of clusters too big (%u)\n",
1357 sbi
->max_cluster
= total_clusters
+ FAT_START_ENT
;
1358 /* check the free_clusters, it's not necessarily correct */
1359 if (sbi
->free_clusters
!= -1 && sbi
->free_clusters
> total_clusters
)
1360 sbi
->free_clusters
= -1;
1361 /* check the prev_free, it's not necessarily correct */
1362 sbi
->prev_free
%= sbi
->max_cluster
;
1363 if (sbi
->prev_free
< FAT_START_ENT
)
1364 sbi
->prev_free
= FAT_START_ENT
;
1368 /* set up enough so that it can read an inode */
1370 fat_ent_access_init(sb
);
1373 * The low byte of FAT's first entry must have same value with
1374 * media-field. But in real world, too many devices is
1375 * writing wrong value. So, removed that validity check.
1377 * if (FAT_FIRST_ENT(sb, media) != first)
1381 sprintf(buf
, "cp%d", sbi
->options
.codepage
);
1382 sbi
->nls_disk
= load_nls(buf
);
1383 if (!sbi
->nls_disk
) {
1384 printk(KERN_ERR
"FAT: codepage %s not found\n", buf
);
1388 /* FIXME: utf8 is using iocharset for upper/lower conversion */
1389 if (sbi
->options
.isvfat
) {
1390 sbi
->nls_io
= load_nls(sbi
->options
.iocharset
);
1392 printk(KERN_ERR
"FAT: IO charset %s not found\n",
1393 sbi
->options
.iocharset
);
1399 root_inode
= new_inode(sb
);
1402 root_inode
->i_ino
= MSDOS_ROOT_INO
;
1403 root_inode
->i_version
= 1;
1404 error
= fat_read_root(root_inode
);
1408 insert_inode_hash(root_inode
);
1409 sb
->s_root
= d_alloc_root(root_inode
);
1411 printk(KERN_ERR
"FAT: get root inode failed\n");
1420 printk(KERN_INFO
"VFS: Can't find a valid FAT filesystem"
1421 " on dev %s.\n", sb
->s_id
);
1427 unload_nls(sbi
->nls_io
);
1429 unload_nls(sbi
->nls_disk
);
1430 if (sbi
->options
.iocharset
!= fat_default_iocharset
)
1431 kfree(sbi
->options
.iocharset
);
1432 sb
->s_fs_info
= NULL
;
1437 EXPORT_SYMBOL_GPL(fat_fill_super
);
1440 * helper function for fat_flush_inodes. This writes both the inode
1441 * and the file data blocks, waiting for in flight data blocks before
1442 * the start of the call. It does not wait for any io started
1445 static int writeback_inode(struct inode
*inode
)
1449 struct address_space
*mapping
= inode
->i_mapping
;
1450 struct writeback_control wbc
= {
1451 .sync_mode
= WB_SYNC_NONE
,
1454 /* if we used WB_SYNC_ALL, sync_inode waits for the io for the
1455 * inode to finish. So WB_SYNC_NONE is sent down to sync_inode
1456 * and filemap_fdatawrite is used for the data blocks
1458 ret
= sync_inode(inode
, &wbc
);
1460 ret
= filemap_fdatawrite(mapping
);
1465 * write data and metadata corresponding to i1 and i2. The io is
1466 * started but we do not wait for any of it to finish.
1468 * filemap_flush is used for the block device, so if there is a dirty
1469 * page for a block already in flight, we will not wait and start the
1472 int fat_flush_inodes(struct super_block
*sb
, struct inode
*i1
, struct inode
*i2
)
1475 if (!MSDOS_SB(sb
)->options
.flush
)
1478 ret
= writeback_inode(i1
);
1480 ret
= writeback_inode(i2
);
1482 struct address_space
*mapping
= sb
->s_bdev
->bd_inode
->i_mapping
;
1483 ret
= filemap_flush(mapping
);
1487 EXPORT_SYMBOL_GPL(fat_flush_inodes
);
1489 static int __init
init_fat_fs(void)
1493 err
= fat_cache_init();
1497 err
= fat_init_inodecache();
1504 fat_cache_destroy();
1508 static void __exit
exit_fat_fs(void)
1510 fat_cache_destroy();
1511 fat_destroy_inodecache();
1514 module_init(init_fat_fs
)
1515 module_exit(exit_fat_fs
)
1517 MODULE_LICENSE("GPL");