4 * Written 1992,1993 by Werner Almesberger
5 * VFAT extensions by Gordon Chaffee, merged with msdos fs by Henrik Storner
6 * Rewritten for the constant inumbers support by Al Viro
10 * Max Cohan: Fixed invalid FSINFO offset when info_sector is 0
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/time.h>
16 #include <linux/slab.h>
17 #include <linux/smp_lock.h>
18 #include <linux/seq_file.h>
19 #include <linux/msdos_fs.h>
20 #include <linux/pagemap.h>
21 #include <linux/mpage.h>
22 #include <linux/buffer_head.h>
23 #include <linux/mount.h>
24 #include <linux/vfs.h>
25 #include <linux/parser.h>
26 #include <linux/uio.h>
27 #include <linux/writeback.h>
28 #include <linux/log2.h>
29 #include <asm/unaligned.h>
31 #ifndef CONFIG_FAT_DEFAULT_IOCHARSET
32 /* if user don't select VFAT, this is undefined. */
33 #define CONFIG_FAT_DEFAULT_IOCHARSET ""
36 static int fat_default_codepage
= CONFIG_FAT_DEFAULT_CODEPAGE
;
37 static char fat_default_iocharset
[] = CONFIG_FAT_DEFAULT_IOCHARSET
;
40 static int fat_add_cluster(struct inode
*inode
)
44 err
= fat_alloc_clusters(inode
, &cluster
, 1);
47 /* FIXME: this cluster should be added after data of this
48 * cluster is writed */
49 err
= fat_chain_add(inode
, cluster
, 1);
51 fat_free_clusters(inode
, cluster
);
55 static inline int __fat_get_block(struct inode
*inode
, sector_t iblock
,
56 unsigned long *max_blocks
,
57 struct buffer_head
*bh_result
, int create
)
59 struct super_block
*sb
= inode
->i_sb
;
60 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
61 unsigned long mapped_blocks
;
65 err
= fat_bmap(inode
, iblock
, &phys
, &mapped_blocks
);
69 map_bh(bh_result
, sb
, phys
);
70 *max_blocks
= min(mapped_blocks
, *max_blocks
);
76 if (iblock
!= MSDOS_I(inode
)->mmu_private
>> sb
->s_blocksize_bits
) {
77 fat_fs_panic(sb
, "corrupted file size (i_pos %lld, %lld)",
78 MSDOS_I(inode
)->i_pos
, MSDOS_I(inode
)->mmu_private
);
82 offset
= (unsigned long)iblock
& (sbi
->sec_per_clus
- 1);
84 /* TODO: multiple cluster allocation would be desirable. */
85 err
= fat_add_cluster(inode
);
89 /* available blocks on this cluster */
90 mapped_blocks
= sbi
->sec_per_clus
- offset
;
92 *max_blocks
= min(mapped_blocks
, *max_blocks
);
93 MSDOS_I(inode
)->mmu_private
+= *max_blocks
<< sb
->s_blocksize_bits
;
95 err
= fat_bmap(inode
, iblock
, &phys
, &mapped_blocks
);
100 BUG_ON(*max_blocks
!= mapped_blocks
);
101 set_buffer_new(bh_result
);
102 map_bh(bh_result
, sb
, phys
);
107 static int fat_get_block(struct inode
*inode
, sector_t iblock
,
108 struct buffer_head
*bh_result
, int create
)
110 struct super_block
*sb
= inode
->i_sb
;
111 unsigned long max_blocks
= bh_result
->b_size
>> inode
->i_blkbits
;
114 err
= __fat_get_block(inode
, iblock
, &max_blocks
, bh_result
, create
);
117 bh_result
->b_size
= max_blocks
<< sb
->s_blocksize_bits
;
121 static int fat_writepage(struct page
*page
, struct writeback_control
*wbc
)
123 return block_write_full_page(page
, fat_get_block
, wbc
);
126 static int fat_writepages(struct address_space
*mapping
,
127 struct writeback_control
*wbc
)
129 return mpage_writepages(mapping
, wbc
, fat_get_block
);
132 static int fat_readpage(struct file
*file
, struct page
*page
)
134 return mpage_readpage(page
, fat_get_block
);
137 static int fat_readpages(struct file
*file
, struct address_space
*mapping
,
138 struct list_head
*pages
, unsigned nr_pages
)
140 return mpage_readpages(mapping
, pages
, nr_pages
, fat_get_block
);
143 static int fat_prepare_write(struct file
*file
, struct page
*page
,
144 unsigned from
, unsigned to
)
146 return cont_prepare_write(page
, from
, to
, fat_get_block
,
147 &MSDOS_I(page
->mapping
->host
)->mmu_private
);
150 static int fat_commit_write(struct file
*file
, struct page
*page
,
151 unsigned from
, unsigned to
)
153 struct inode
*inode
= page
->mapping
->host
;
154 int err
= generic_commit_write(file
, page
, from
, to
);
155 if (!err
&& !(MSDOS_I(inode
)->i_attrs
& ATTR_ARCH
)) {
156 inode
->i_mtime
= inode
->i_ctime
= CURRENT_TIME_SEC
;
157 MSDOS_I(inode
)->i_attrs
|= ATTR_ARCH
;
158 mark_inode_dirty(inode
);
163 static ssize_t
fat_direct_IO(int rw
, struct kiocb
*iocb
,
164 const struct iovec
*iov
,
165 loff_t offset
, unsigned long nr_segs
)
167 struct file
*file
= iocb
->ki_filp
;
168 struct inode
*inode
= file
->f_mapping
->host
;
172 * FIXME: blockdev_direct_IO() doesn't use ->prepare_write(),
173 * so we need to update the ->mmu_private to block boundary.
175 * But we must fill the remaining area or hole by nul for
176 * updating ->mmu_private.
178 * Return 0, and fallback to normal buffered write.
180 loff_t size
= offset
+ iov_length(iov
, nr_segs
);
181 if (MSDOS_I(inode
)->mmu_private
< size
)
186 * FAT need to use the DIO_LOCKING for avoiding the race
187 * condition of fat_get_block() and ->truncate().
189 return blockdev_direct_IO(rw
, iocb
, inode
, inode
->i_sb
->s_bdev
, iov
,
190 offset
, nr_segs
, fat_get_block
, NULL
);
193 static sector_t
_fat_bmap(struct address_space
*mapping
, sector_t block
)
195 return generic_block_bmap(mapping
, block
, fat_get_block
);
198 static const struct address_space_operations fat_aops
= {
199 .readpage
= fat_readpage
,
200 .readpages
= fat_readpages
,
201 .writepage
= fat_writepage
,
202 .writepages
= fat_writepages
,
203 .sync_page
= block_sync_page
,
204 .prepare_write
= fat_prepare_write
,
205 .commit_write
= fat_commit_write
,
206 .direct_IO
= fat_direct_IO
,
211 * New FAT inode stuff. We do the following:
212 * a) i_ino is constant and has nothing with on-disk location.
213 * b) FAT manages its own cache of directory entries.
214 * c) *This* cache is indexed by on-disk location.
215 * d) inode has an associated directory entry, all right, but
216 * it may be unhashed.
217 * e) currently entries are stored within struct inode. That should
219 * f) we deal with races in the following way:
220 * 1. readdir() and lookup() do FAT-dir-cache lookup.
221 * 2. rename() unhashes the F-d-c entry and rehashes it in
223 * 3. unlink() and rmdir() unhash F-d-c entry.
224 * 4. fat_write_inode() checks whether the thing is unhashed.
225 * If it is we silently return. If it isn't we do bread(),
226 * check if the location is still valid and retry if it
227 * isn't. Otherwise we do changes.
228 * 5. Spinlock is used to protect hash/unhash/location check/lookup
229 * 6. fat_clear_inode() unhashes the F-d-c entry.
230 * 7. lookup() and readdir() do igrab() if they find a F-d-c entry
231 * and consider negative result as cache miss.
234 static void fat_hash_init(struct super_block
*sb
)
236 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
239 spin_lock_init(&sbi
->inode_hash_lock
);
240 for (i
= 0; i
< FAT_HASH_SIZE
; i
++)
241 INIT_HLIST_HEAD(&sbi
->inode_hashtable
[i
]);
244 static inline unsigned long fat_hash(struct super_block
*sb
, loff_t i_pos
)
246 unsigned long tmp
= (unsigned long)i_pos
| (unsigned long) sb
;
247 tmp
= tmp
+ (tmp
>> FAT_HASH_BITS
) + (tmp
>> FAT_HASH_BITS
* 2);
248 return tmp
& FAT_HASH_MASK
;
251 void fat_attach(struct inode
*inode
, loff_t i_pos
)
253 struct super_block
*sb
= inode
->i_sb
;
254 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
256 spin_lock(&sbi
->inode_hash_lock
);
257 MSDOS_I(inode
)->i_pos
= i_pos
;
258 hlist_add_head(&MSDOS_I(inode
)->i_fat_hash
,
259 sbi
->inode_hashtable
+ fat_hash(sb
, i_pos
));
260 spin_unlock(&sbi
->inode_hash_lock
);
263 EXPORT_SYMBOL_GPL(fat_attach
);
265 void fat_detach(struct inode
*inode
)
267 struct msdos_sb_info
*sbi
= MSDOS_SB(inode
->i_sb
);
268 spin_lock(&sbi
->inode_hash_lock
);
269 MSDOS_I(inode
)->i_pos
= 0;
270 hlist_del_init(&MSDOS_I(inode
)->i_fat_hash
);
271 spin_unlock(&sbi
->inode_hash_lock
);
274 EXPORT_SYMBOL_GPL(fat_detach
);
276 struct inode
*fat_iget(struct super_block
*sb
, loff_t i_pos
)
278 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
279 struct hlist_head
*head
= sbi
->inode_hashtable
+ fat_hash(sb
, i_pos
);
280 struct hlist_node
*_p
;
281 struct msdos_inode_info
*i
;
282 struct inode
*inode
= NULL
;
284 spin_lock(&sbi
->inode_hash_lock
);
285 hlist_for_each_entry(i
, _p
, head
, i_fat_hash
) {
286 BUG_ON(i
->vfs_inode
.i_sb
!= sb
);
287 if (i
->i_pos
!= i_pos
)
289 inode
= igrab(&i
->vfs_inode
);
293 spin_unlock(&sbi
->inode_hash_lock
);
297 static int is_exec(unsigned char *extension
)
299 unsigned char *exe_extensions
= "EXECOMBAT", *walk
;
301 for (walk
= exe_extensions
; *walk
; walk
+= 3)
302 if (!strncmp(extension
, walk
, 3))
307 static int fat_calc_dir_size(struct inode
*inode
)
309 struct msdos_sb_info
*sbi
= MSDOS_SB(inode
->i_sb
);
310 int ret
, fclus
, dclus
;
313 if (MSDOS_I(inode
)->i_start
== 0)
316 ret
= fat_get_cluster(inode
, FAT_ENT_EOF
, &fclus
, &dclus
);
319 inode
->i_size
= (fclus
+ 1) << sbi
->cluster_bits
;
324 /* doesn't deal with root inode */
325 static int fat_fill_inode(struct inode
*inode
, struct msdos_dir_entry
*de
)
327 struct msdos_sb_info
*sbi
= MSDOS_SB(inode
->i_sb
);
330 MSDOS_I(inode
)->i_pos
= 0;
331 inode
->i_uid
= sbi
->options
.fs_uid
;
332 inode
->i_gid
= sbi
->options
.fs_gid
;
334 inode
->i_generation
= get_seconds();
336 if ((de
->attr
& ATTR_DIR
) && !IS_FREE(de
->name
)) {
337 inode
->i_generation
&= ~1;
338 inode
->i_mode
= MSDOS_MKMODE(de
->attr
,
339 S_IRWXUGO
& ~sbi
->options
.fs_dmask
) | S_IFDIR
;
340 inode
->i_op
= sbi
->dir_ops
;
341 inode
->i_fop
= &fat_dir_operations
;
343 MSDOS_I(inode
)->i_start
= le16_to_cpu(de
->start
);
344 if (sbi
->fat_bits
== 32)
345 MSDOS_I(inode
)->i_start
|= (le16_to_cpu(de
->starthi
) << 16);
347 MSDOS_I(inode
)->i_logstart
= MSDOS_I(inode
)->i_start
;
348 error
= fat_calc_dir_size(inode
);
351 MSDOS_I(inode
)->mmu_private
= inode
->i_size
;
353 inode
->i_nlink
= fat_subdirs(inode
);
354 } else { /* not a directory */
355 inode
->i_generation
|= 1;
356 inode
->i_mode
= MSDOS_MKMODE(de
->attr
,
357 ((sbi
->options
.showexec
&&
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 if (flags
& SLAB_CTOR_CONSTRUCTOR
) {
504 spin_lock_init(&ei
->cache_lru_lock
);
506 ei
->cache_valid_id
= FAT_CACHE_VALID
+ 1;
507 INIT_LIST_HEAD(&ei
->cache_lru
);
508 INIT_HLIST_NODE(&ei
->i_fat_hash
);
509 inode_init_once(&ei
->vfs_inode
);
513 static int __init
fat_init_inodecache(void)
515 fat_inode_cachep
= kmem_cache_create("fat_inode_cache",
516 sizeof(struct msdos_inode_info
),
517 0, (SLAB_RECLAIM_ACCOUNT
|
520 if (fat_inode_cachep
== NULL
)
525 static void __exit
fat_destroy_inodecache(void)
527 kmem_cache_destroy(fat_inode_cachep
);
530 static int fat_remount(struct super_block
*sb
, int *flags
, char *data
)
532 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
533 *flags
|= MS_NODIRATIME
| (sbi
->options
.isvfat
? 0 : MS_NOATIME
);
537 static int fat_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
539 struct msdos_sb_info
*sbi
= MSDOS_SB(dentry
->d_sb
);
541 /* If the count of free cluster is still unknown, counts it here. */
542 if (sbi
->free_clusters
== -1) {
543 int err
= fat_count_free_clusters(dentry
->d_sb
);
548 buf
->f_type
= dentry
->d_sb
->s_magic
;
549 buf
->f_bsize
= sbi
->cluster_size
;
550 buf
->f_blocks
= sbi
->max_cluster
- FAT_START_ENT
;
551 buf
->f_bfree
= sbi
->free_clusters
;
552 buf
->f_bavail
= sbi
->free_clusters
;
553 buf
->f_namelen
= sbi
->options
.isvfat
? 260 : 12;
558 static int fat_write_inode(struct inode
*inode
, int wait
)
560 struct super_block
*sb
= inode
->i_sb
;
561 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
562 struct buffer_head
*bh
;
563 struct msdos_dir_entry
*raw_entry
;
568 i_pos
= MSDOS_I(inode
)->i_pos
;
569 if (inode
->i_ino
== MSDOS_ROOT_INO
|| !i_pos
)
573 bh
= sb_bread(sb
, i_pos
>> sbi
->dir_per_block_bits
);
575 printk(KERN_ERR
"FAT: unable to read inode block "
576 "for updating (i_pos %lld)\n", i_pos
);
580 spin_lock(&sbi
->inode_hash_lock
);
581 if (i_pos
!= MSDOS_I(inode
)->i_pos
) {
582 spin_unlock(&sbi
->inode_hash_lock
);
588 raw_entry
= &((struct msdos_dir_entry
*) (bh
->b_data
))
589 [i_pos
& (sbi
->dir_per_block
- 1)];
590 if (S_ISDIR(inode
->i_mode
))
593 raw_entry
->size
= cpu_to_le32(inode
->i_size
);
594 raw_entry
->attr
= fat_attr(inode
);
595 raw_entry
->start
= cpu_to_le16(MSDOS_I(inode
)->i_logstart
);
596 raw_entry
->starthi
= cpu_to_le16(MSDOS_I(inode
)->i_logstart
>> 16);
597 fat_date_unix2dos(inode
->i_mtime
.tv_sec
, &raw_entry
->time
, &raw_entry
->date
);
598 if (sbi
->options
.isvfat
) {
600 fat_date_unix2dos(inode
->i_ctime
.tv_sec
,&raw_entry
->ctime
,&raw_entry
->cdate
);
601 fat_date_unix2dos(inode
->i_atime
.tv_sec
,&atime
,&raw_entry
->adate
);
602 raw_entry
->ctime_cs
= (inode
->i_ctime
.tv_sec
& 1) * 100 +
603 inode
->i_ctime
.tv_nsec
/ 10000000;
605 spin_unlock(&sbi
->inode_hash_lock
);
606 mark_buffer_dirty(bh
);
608 err
= sync_dirty_buffer(bh
);
615 int fat_sync_inode(struct inode
*inode
)
617 return fat_write_inode(inode
, 1);
620 EXPORT_SYMBOL_GPL(fat_sync_inode
);
622 static int fat_show_options(struct seq_file
*m
, struct vfsmount
*mnt
);
623 static const struct super_operations fat_sops
= {
624 .alloc_inode
= fat_alloc_inode
,
625 .destroy_inode
= fat_destroy_inode
,
626 .write_inode
= fat_write_inode
,
627 .delete_inode
= fat_delete_inode
,
628 .put_super
= fat_put_super
,
629 .write_super
= fat_write_super
,
630 .statfs
= fat_statfs
,
631 .clear_inode
= fat_clear_inode
,
632 .remount_fs
= fat_remount
,
634 .read_inode
= make_bad_inode
,
636 .show_options
= fat_show_options
,
640 * a FAT file handle with fhtype 3 is
641 * 0/ i_ino - for fast, reliable lookup if still in the cache
642 * 1/ i_generation - to see if i_ino is still valid
643 * bit 0 == 0 iff directory
644 * 2/ i_pos(8-39) - if ino has changed, but still in cache
645 * 3/ i_pos(4-7)|i_logstart - to semi-verify inode found at i_pos
646 * 4/ i_pos(0-3)|parent->i_logstart - maybe used to hunt for the file on disc
648 * Hack for NFSv2: Maximum FAT entry number is 28bits and maximum
649 * i_pos is 40bits (blocknr(32) + dir offset(8)), so two 4bits
650 * of i_logstart is used to store the directory entry offset.
653 static struct dentry
*
654 fat_decode_fh(struct super_block
*sb
, __u32
*fh
, int len
, int fhtype
,
655 int (*acceptable
)(void *context
, struct dentry
*de
),
659 return ERR_PTR(-ESTALE
);
661 return ERR_PTR(-ESTALE
);
663 return sb
->s_export_op
->find_exported_dentry(sb
, fh
, NULL
, acceptable
, context
);
666 static struct dentry
*fat_get_dentry(struct super_block
*sb
, void *inump
)
668 struct inode
*inode
= NULL
;
669 struct dentry
*result
;
672 inode
= iget(sb
, fh
[0]);
673 if (!inode
|| is_bad_inode(inode
) || inode
->i_generation
!= fh
[1]) {
680 int i_logstart
= fh
[3] & 0x0fffffff;
682 i_pos
= (loff_t
)fh
[2] << 8;
683 i_pos
|= ((fh
[3] >> 24) & 0xf0) | (fh
[4] >> 28);
685 /* try 2 - see if i_pos is in F-d-c
686 * require i_logstart to be the same
687 * Will fail if you truncate and then re-write
690 inode
= fat_iget(sb
, i_pos
);
691 if (inode
&& MSDOS_I(inode
)->i_logstart
!= i_logstart
) {
697 /* For now, do nothing
698 * What we could do is:
699 * follow the file starting at fh[4], and record
700 * the ".." entry, and the name of the fh[2] entry.
701 * The follow the ".." file finding the next step up.
702 * This way we build a path to the root of
703 * the tree. If this works, we lookup the path and so
704 * get this inode into the cache.
705 * Finally try the fat_iget lookup again
706 * If that fails, then weare totally out of luck
707 * But all that is for another day
711 return ERR_PTR(-ESTALE
);
714 /* now to find a dentry.
715 * If possible, get a well-connected one
717 result
= d_alloc_anon(inode
);
718 if (result
== NULL
) {
720 return ERR_PTR(-ENOMEM
);
722 result
->d_op
= sb
->s_root
->d_op
;
727 fat_encode_fh(struct dentry
*de
, __u32
*fh
, int *lenp
, int connectable
)
730 struct inode
*inode
= de
->d_inode
;
731 u32 ipos_h
, ipos_m
, ipos_l
;
734 return 255; /* no room */
736 ipos_h
= MSDOS_I(inode
)->i_pos
>> 8;
737 ipos_m
= (MSDOS_I(inode
)->i_pos
& 0xf0) << 24;
738 ipos_l
= (MSDOS_I(inode
)->i_pos
& 0x0f) << 28;
740 fh
[0] = inode
->i_ino
;
741 fh
[1] = inode
->i_generation
;
743 fh
[3] = ipos_m
| MSDOS_I(inode
)->i_logstart
;
744 spin_lock(&de
->d_lock
);
745 fh
[4] = ipos_l
| MSDOS_I(de
->d_parent
->d_inode
)->i_logstart
;
746 spin_unlock(&de
->d_lock
);
750 static struct dentry
*fat_get_parent(struct dentry
*child
)
752 struct buffer_head
*bh
;
753 struct msdos_dir_entry
*de
;
755 struct dentry
*parent
;
761 err
= fat_get_dotdot_entry(child
->d_inode
, &bh
, &de
, &i_pos
);
763 parent
= ERR_PTR(err
);
766 inode
= fat_build_inode(child
->d_sb
, de
, i_pos
);
769 parent
= ERR_PTR(PTR_ERR(inode
));
772 parent
= d_alloc_anon(inode
);
775 parent
= ERR_PTR(-ENOMEM
);
783 static struct export_operations fat_export_ops
= {
784 .decode_fh
= fat_decode_fh
,
785 .encode_fh
= fat_encode_fh
,
786 .get_dentry
= fat_get_dentry
,
787 .get_parent
= fat_get_parent
,
790 static int fat_show_options(struct seq_file
*m
, struct vfsmount
*mnt
)
792 struct msdos_sb_info
*sbi
= MSDOS_SB(mnt
->mnt_sb
);
793 struct fat_mount_options
*opts
= &sbi
->options
;
794 int isvfat
= opts
->isvfat
;
796 if (opts
->fs_uid
!= 0)
797 seq_printf(m
, ",uid=%u", opts
->fs_uid
);
798 if (opts
->fs_gid
!= 0)
799 seq_printf(m
, ",gid=%u", opts
->fs_gid
);
800 seq_printf(m
, ",fmask=%04o", opts
->fs_fmask
);
801 seq_printf(m
, ",dmask=%04o", opts
->fs_dmask
);
803 seq_printf(m
, ",codepage=%s", sbi
->nls_disk
->charset
);
806 seq_printf(m
, ",iocharset=%s", sbi
->nls_io
->charset
);
808 switch (opts
->shortname
) {
809 case VFAT_SFN_DISPLAY_WIN95
| VFAT_SFN_CREATE_WIN95
:
810 seq_puts(m
, ",shortname=win95");
812 case VFAT_SFN_DISPLAY_WINNT
| VFAT_SFN_CREATE_WINNT
:
813 seq_puts(m
, ",shortname=winnt");
815 case VFAT_SFN_DISPLAY_WINNT
| VFAT_SFN_CREATE_WIN95
:
816 seq_puts(m
, ",shortname=mixed");
818 case VFAT_SFN_DISPLAY_LOWER
| VFAT_SFN_CREATE_WIN95
:
819 /* seq_puts(m, ",shortname=lower"); */
822 seq_puts(m
, ",shortname=unknown");
826 if (opts
->name_check
!= 'n')
827 seq_printf(m
, ",check=%c", opts
->name_check
);
829 seq_puts(m
, ",usefree");
831 seq_puts(m
, ",quiet");
833 seq_puts(m
, ",showexec");
834 if (opts
->sys_immutable
)
835 seq_puts(m
, ",sys_immutable");
838 seq_puts(m
, ",dotsOK=yes");
840 seq_puts(m
, ",nocase");
843 seq_puts(m
, ",utf8");
844 if (opts
->unicode_xlate
)
845 seq_puts(m
, ",uni_xlate");
847 seq_puts(m
, ",nonumtail");
854 Opt_check_n
, Opt_check_r
, Opt_check_s
, Opt_uid
, Opt_gid
,
855 Opt_umask
, Opt_dmask
, Opt_fmask
, Opt_codepage
, Opt_usefree
, Opt_nocase
,
856 Opt_quiet
, Opt_showexec
, Opt_debug
, Opt_immutable
,
857 Opt_dots
, Opt_nodots
,
858 Opt_charset
, Opt_shortname_lower
, Opt_shortname_win95
,
859 Opt_shortname_winnt
, Opt_shortname_mixed
, Opt_utf8_no
, Opt_utf8_yes
,
860 Opt_uni_xl_no
, Opt_uni_xl_yes
, Opt_nonumtail_no
, Opt_nonumtail_yes
,
861 Opt_obsolate
, Opt_flush
, Opt_err
,
864 static match_table_t fat_tokens
= {
865 {Opt_check_r
, "check=relaxed"},
866 {Opt_check_s
, "check=strict"},
867 {Opt_check_n
, "check=normal"},
868 {Opt_check_r
, "check=r"},
869 {Opt_check_s
, "check=s"},
870 {Opt_check_n
, "check=n"},
873 {Opt_umask
, "umask=%o"},
874 {Opt_dmask
, "dmask=%o"},
875 {Opt_fmask
, "fmask=%o"},
876 {Opt_codepage
, "codepage=%u"},
877 {Opt_usefree
, "usefree"},
878 {Opt_nocase
, "nocase"},
879 {Opt_quiet
, "quiet"},
880 {Opt_showexec
, "showexec"},
881 {Opt_debug
, "debug"},
882 {Opt_immutable
, "sys_immutable"},
883 {Opt_obsolate
, "conv=binary"},
884 {Opt_obsolate
, "conv=text"},
885 {Opt_obsolate
, "conv=auto"},
886 {Opt_obsolate
, "conv=b"},
887 {Opt_obsolate
, "conv=t"},
888 {Opt_obsolate
, "conv=a"},
889 {Opt_obsolate
, "fat=%u"},
890 {Opt_obsolate
, "blocksize=%u"},
891 {Opt_obsolate
, "cvf_format=%20s"},
892 {Opt_obsolate
, "cvf_options=%100s"},
893 {Opt_obsolate
, "posix"},
894 {Opt_flush
, "flush"},
897 static match_table_t msdos_tokens
= {
898 {Opt_nodots
, "nodots"},
899 {Opt_nodots
, "dotsOK=no"},
901 {Opt_dots
, "dotsOK=yes"},
904 static match_table_t vfat_tokens
= {
905 {Opt_charset
, "iocharset=%s"},
906 {Opt_shortname_lower
, "shortname=lower"},
907 {Opt_shortname_win95
, "shortname=win95"},
908 {Opt_shortname_winnt
, "shortname=winnt"},
909 {Opt_shortname_mixed
, "shortname=mixed"},
910 {Opt_utf8_no
, "utf8=0"}, /* 0 or no or false */
911 {Opt_utf8_no
, "utf8=no"},
912 {Opt_utf8_no
, "utf8=false"},
913 {Opt_utf8_yes
, "utf8=1"}, /* empty or 1 or yes or true */
914 {Opt_utf8_yes
, "utf8=yes"},
915 {Opt_utf8_yes
, "utf8=true"},
916 {Opt_utf8_yes
, "utf8"},
917 {Opt_uni_xl_no
, "uni_xlate=0"}, /* 0 or no or false */
918 {Opt_uni_xl_no
, "uni_xlate=no"},
919 {Opt_uni_xl_no
, "uni_xlate=false"},
920 {Opt_uni_xl_yes
, "uni_xlate=1"}, /* empty or 1 or yes or true */
921 {Opt_uni_xl_yes
, "uni_xlate=yes"},
922 {Opt_uni_xl_yes
, "uni_xlate=true"},
923 {Opt_uni_xl_yes
, "uni_xlate"},
924 {Opt_nonumtail_no
, "nonumtail=0"}, /* 0 or no or false */
925 {Opt_nonumtail_no
, "nonumtail=no"},
926 {Opt_nonumtail_no
, "nonumtail=false"},
927 {Opt_nonumtail_yes
, "nonumtail=1"}, /* empty or 1 or yes or true */
928 {Opt_nonumtail_yes
, "nonumtail=yes"},
929 {Opt_nonumtail_yes
, "nonumtail=true"},
930 {Opt_nonumtail_yes
, "nonumtail"},
934 static int parse_options(char *options
, int is_vfat
, int silent
, int *debug
,
935 struct fat_mount_options
*opts
)
938 substring_t args
[MAX_OPT_ARGS
];
942 opts
->isvfat
= is_vfat
;
944 opts
->fs_uid
= current
->uid
;
945 opts
->fs_gid
= current
->gid
;
946 opts
->fs_fmask
= opts
->fs_dmask
= current
->fs
->umask
;
947 opts
->codepage
= fat_default_codepage
;
948 opts
->iocharset
= fat_default_iocharset
;
950 opts
->shortname
= VFAT_SFN_DISPLAY_LOWER
|VFAT_SFN_CREATE_WIN95
;
953 opts
->name_check
= 'n';
954 opts
->quiet
= opts
->showexec
= opts
->sys_immutable
= opts
->dotsOK
= 0;
955 opts
->utf8
= opts
->unicode_xlate
= 0;
957 opts
->usefree
= opts
->nocase
= 0;
963 while ((p
= strsep(&options
, ",")) != NULL
) {
968 token
= match_token(p
, fat_tokens
, args
);
969 if (token
== Opt_err
) {
971 token
= match_token(p
, vfat_tokens
, args
);
973 token
= match_token(p
, msdos_tokens
, args
);
977 opts
->name_check
= 's';
980 opts
->name_check
= 'r';
983 opts
->name_check
= 'n';
992 /* for backward compatibility */
993 opts
->shortname
= VFAT_SFN_DISPLAY_WIN95
994 | VFAT_SFN_CREATE_WIN95
;
1007 opts
->sys_immutable
= 1;
1010 if (match_int(&args
[0], &option
))
1012 opts
->fs_uid
= option
;
1015 if (match_int(&args
[0], &option
))
1017 opts
->fs_gid
= option
;
1020 if (match_octal(&args
[0], &option
))
1022 opts
->fs_fmask
= opts
->fs_dmask
= option
;
1025 if (match_octal(&args
[0], &option
))
1027 opts
->fs_dmask
= option
;
1030 if (match_octal(&args
[0], &option
))
1032 opts
->fs_fmask
= option
;
1035 if (match_int(&args
[0], &option
))
1037 opts
->codepage
= option
;
1043 /* msdos specific */
1053 if (opts
->iocharset
!= fat_default_iocharset
)
1054 kfree(opts
->iocharset
);
1055 iocharset
= match_strdup(&args
[0]);
1058 opts
->iocharset
= iocharset
;
1060 case Opt_shortname_lower
:
1061 opts
->shortname
= VFAT_SFN_DISPLAY_LOWER
1062 | VFAT_SFN_CREATE_WIN95
;
1064 case Opt_shortname_win95
:
1065 opts
->shortname
= VFAT_SFN_DISPLAY_WIN95
1066 | VFAT_SFN_CREATE_WIN95
;
1068 case Opt_shortname_winnt
:
1069 opts
->shortname
= VFAT_SFN_DISPLAY_WINNT
1070 | VFAT_SFN_CREATE_WINNT
;
1072 case Opt_shortname_mixed
:
1073 opts
->shortname
= VFAT_SFN_DISPLAY_WINNT
1074 | VFAT_SFN_CREATE_WIN95
;
1076 case Opt_utf8_no
: /* 0 or no or false */
1079 case Opt_utf8_yes
: /* empty or 1 or yes or true */
1082 case Opt_uni_xl_no
: /* 0 or no or false */
1083 opts
->unicode_xlate
= 0;
1085 case Opt_uni_xl_yes
: /* empty or 1 or yes or true */
1086 opts
->unicode_xlate
= 1;
1088 case Opt_nonumtail_no
: /* 0 or no or false */
1089 opts
->numtail
= 1; /* negated option */
1091 case Opt_nonumtail_yes
: /* empty or 1 or yes or true */
1092 opts
->numtail
= 0; /* negated option */
1095 /* obsolete mount options */
1097 printk(KERN_INFO
"FAT: \"%s\" option is obsolete, "
1098 "not supported now\n", p
);
1100 /* unknown option */
1104 "FAT: Unrecognized mount option \"%s\" "
1105 "or missing value\n", p
);
1110 /* UTF-8 doesn't provide FAT semantics */
1111 if (!strcmp(opts
->iocharset
, "utf8")) {
1112 printk(KERN_ERR
"FAT: utf8 is not a recommended IO charset"
1113 " for FAT filesystems, filesystem will be case sensitive!\n");
1116 if (opts
->unicode_xlate
)
1122 static int fat_read_root(struct inode
*inode
)
1124 struct super_block
*sb
= inode
->i_sb
;
1125 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
1128 MSDOS_I(inode
)->i_pos
= 0;
1129 inode
->i_uid
= sbi
->options
.fs_uid
;
1130 inode
->i_gid
= sbi
->options
.fs_gid
;
1132 inode
->i_generation
= 0;
1133 inode
->i_mode
= (S_IRWXUGO
& ~sbi
->options
.fs_dmask
) | S_IFDIR
;
1134 inode
->i_op
= sbi
->dir_ops
;
1135 inode
->i_fop
= &fat_dir_operations
;
1136 if (sbi
->fat_bits
== 32) {
1137 MSDOS_I(inode
)->i_start
= sbi
->root_cluster
;
1138 error
= fat_calc_dir_size(inode
);
1142 MSDOS_I(inode
)->i_start
= 0;
1143 inode
->i_size
= sbi
->dir_entries
* sizeof(struct msdos_dir_entry
);
1145 inode
->i_blocks
= ((inode
->i_size
+ (sbi
->cluster_size
- 1))
1146 & ~((loff_t
)sbi
->cluster_size
- 1)) >> 9;
1147 MSDOS_I(inode
)->i_logstart
= 0;
1148 MSDOS_I(inode
)->mmu_private
= inode
->i_size
;
1150 MSDOS_I(inode
)->i_attrs
= ATTR_NONE
;
1151 inode
->i_mtime
.tv_sec
= inode
->i_atime
.tv_sec
= inode
->i_ctime
.tv_sec
= 0;
1152 inode
->i_mtime
.tv_nsec
= inode
->i_atime
.tv_nsec
= inode
->i_ctime
.tv_nsec
= 0;
1153 inode
->i_nlink
= fat_subdirs(inode
)+2;
1159 * Read the super block of an MS-DOS FS.
1161 int fat_fill_super(struct super_block
*sb
, void *data
, int silent
,
1162 const struct inode_operations
*fs_dir_inode_ops
, int isvfat
)
1164 struct inode
*root_inode
= NULL
;
1165 struct buffer_head
*bh
;
1166 struct fat_boot_sector
*b
;
1167 struct msdos_sb_info
*sbi
;
1168 u16 logical_sector_size
;
1169 u32 total_sectors
, total_clusters
, fat_clusters
, rootdir_sectors
;
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 sbi
->dir_ops
= fs_dir_inode_ops
;
1186 error
= parse_options(data
, isvfat
, silent
, &debug
, &sbi
->options
);
1191 sb_min_blocksize(sb
, 512);
1192 bh
= sb_bread(sb
, 0);
1194 printk(KERN_ERR
"FAT: unable to read boot sector\n");
1198 b
= (struct fat_boot_sector
*) bh
->b_data
;
1201 printk(KERN_ERR
"FAT: bogus number of reserved sectors\n");
1207 printk(KERN_ERR
"FAT: bogus number of FAT structure\n");
1213 * Earlier we checked here that b->secs_track and b->head are nonzero,
1214 * but it turns out valid FAT filesystems can have zero there.
1218 if (!FAT_VALID_MEDIA(media
)) {
1220 printk(KERN_ERR
"FAT: invalid media value (0x%02x)\n",
1225 logical_sector_size
=
1226 le16_to_cpu(get_unaligned((__le16
*)&b
->sector_size
));
1227 if (!is_power_of_2(logical_sector_size
)
1228 || (logical_sector_size
< 512)
1229 || (PAGE_CACHE_SIZE
< logical_sector_size
)) {
1231 printk(KERN_ERR
"FAT: bogus logical sector size %u\n",
1232 logical_sector_size
);
1236 sbi
->sec_per_clus
= b
->sec_per_clus
;
1237 if (!is_power_of_2(sbi
->sec_per_clus
)) {
1239 printk(KERN_ERR
"FAT: bogus sectors per cluster %u\n",
1245 if (logical_sector_size
< sb
->s_blocksize
) {
1246 printk(KERN_ERR
"FAT: logical sector size too small for device"
1247 " (logical sector size = %u)\n", logical_sector_size
);
1251 if (logical_sector_size
> sb
->s_blocksize
) {
1254 if (!sb_set_blocksize(sb
, logical_sector_size
)) {
1255 printk(KERN_ERR
"FAT: unable to set blocksize %u\n",
1256 logical_sector_size
);
1259 bh
= sb_bread(sb
, 0);
1261 printk(KERN_ERR
"FAT: unable to read boot sector"
1262 " (logical sector size = %lu)\n",
1266 b
= (struct fat_boot_sector
*) bh
->b_data
;
1269 sbi
->cluster_size
= sb
->s_blocksize
* sbi
->sec_per_clus
;
1270 sbi
->cluster_bits
= ffs(sbi
->cluster_size
) - 1;
1271 sbi
->fats
= b
->fats
;
1272 sbi
->fat_bits
= 0; /* Don't know yet */
1273 sbi
->fat_start
= le16_to_cpu(b
->reserved
);
1274 sbi
->fat_length
= le16_to_cpu(b
->fat_length
);
1275 sbi
->root_cluster
= 0;
1276 sbi
->free_clusters
= -1; /* Don't know yet */
1277 sbi
->prev_free
= FAT_START_ENT
;
1279 if (!sbi
->fat_length
&& b
->fat32_length
) {
1280 struct fat_boot_fsinfo
*fsinfo
;
1281 struct buffer_head
*fsinfo_bh
;
1285 sbi
->fat_length
= le32_to_cpu(b
->fat32_length
);
1286 sbi
->root_cluster
= le32_to_cpu(b
->root_cluster
);
1288 sb
->s_maxbytes
= 0xffffffff;
1290 /* MC - if info_sector is 0, don't multiply by 0 */
1291 sbi
->fsinfo_sector
= le16_to_cpu(b
->info_sector
);
1292 if (sbi
->fsinfo_sector
== 0)
1293 sbi
->fsinfo_sector
= 1;
1295 fsinfo_bh
= sb_bread(sb
, sbi
->fsinfo_sector
);
1296 if (fsinfo_bh
== NULL
) {
1297 printk(KERN_ERR
"FAT: bread failed, FSINFO block"
1298 " (sector = %lu)\n", sbi
->fsinfo_sector
);
1303 fsinfo
= (struct fat_boot_fsinfo
*)fsinfo_bh
->b_data
;
1304 if (!IS_FSINFO(fsinfo
)) {
1306 "FAT: Did not find valid FSINFO signature.\n"
1307 " Found signature1 0x%08x signature2 0x%08x"
1308 " (sector = %lu)\n",
1309 le32_to_cpu(fsinfo
->signature1
),
1310 le32_to_cpu(fsinfo
->signature2
),
1311 sbi
->fsinfo_sector
);
1313 if (sbi
->options
.usefree
)
1314 sbi
->free_clusters
=
1315 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
;
1327 le16_to_cpu(get_unaligned((__le16
*)&b
->dir_entries
));
1328 if (sbi
->dir_entries
& (sbi
->dir_per_block
- 1)) {
1330 printk(KERN_ERR
"FAT: bogus directroy-entries per block"
1331 " (%u)\n", sbi
->dir_entries
);
1336 rootdir_sectors
= sbi
->dir_entries
1337 * sizeof(struct msdos_dir_entry
) / sb
->s_blocksize
;
1338 sbi
->data_start
= sbi
->dir_start
+ rootdir_sectors
;
1339 total_sectors
= le16_to_cpu(get_unaligned((__le16
*)&b
->sectors
));
1340 if (total_sectors
== 0)
1341 total_sectors
= le32_to_cpu(b
->total_sect
);
1343 total_clusters
= (total_sectors
- sbi
->data_start
) / sbi
->sec_per_clus
;
1345 if (sbi
->fat_bits
!= 32)
1346 sbi
->fat_bits
= (total_clusters
> MAX_FAT12
) ? 16 : 12;
1348 /* check that FAT table does not overflow */
1349 fat_clusters
= sbi
->fat_length
* sb
->s_blocksize
* 8 / sbi
->fat_bits
;
1350 total_clusters
= min(total_clusters
, fat_clusters
- FAT_START_ENT
);
1351 if (total_clusters
> MAX_FAT(sb
)) {
1353 printk(KERN_ERR
"FAT: count of clusters too big (%u)\n",
1359 sbi
->max_cluster
= total_clusters
+ FAT_START_ENT
;
1360 /* check the free_clusters, it's not necessarily correct */
1361 if (sbi
->free_clusters
!= -1 && sbi
->free_clusters
> total_clusters
)
1362 sbi
->free_clusters
= -1;
1363 /* check the prev_free, it's not necessarily correct */
1364 sbi
->prev_free
%= sbi
->max_cluster
;
1365 if (sbi
->prev_free
< FAT_START_ENT
)
1366 sbi
->prev_free
= FAT_START_ENT
;
1370 /* 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 printk(KERN_ERR
"FAT: codepage %s not found\n", 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 printk(KERN_ERR
"FAT: IO charset %s not found\n",
1395 sbi
->options
.iocharset
);
1401 root_inode
= new_inode(sb
);
1404 root_inode
->i_ino
= MSDOS_ROOT_INO
;
1405 root_inode
->i_version
= 1;
1406 error
= fat_read_root(root_inode
);
1410 insert_inode_hash(root_inode
);
1411 sb
->s_root
= d_alloc_root(root_inode
);
1413 printk(KERN_ERR
"FAT: get root inode failed\n");
1422 printk(KERN_INFO
"VFS: Can't find a valid FAT filesystem"
1423 " on dev %s.\n", sb
->s_id
);
1429 unload_nls(sbi
->nls_io
);
1431 unload_nls(sbi
->nls_disk
);
1432 if (sbi
->options
.iocharset
!= fat_default_iocharset
)
1433 kfree(sbi
->options
.iocharset
);
1434 sb
->s_fs_info
= NULL
;
1439 EXPORT_SYMBOL_GPL(fat_fill_super
);
1442 * helper function for fat_flush_inodes. This writes both the inode
1443 * and the file data blocks, waiting for in flight data blocks before
1444 * the start of the call. It does not wait for any io started
1447 static int writeback_inode(struct inode
*inode
)
1451 struct address_space
*mapping
= inode
->i_mapping
;
1452 struct writeback_control wbc
= {
1453 .sync_mode
= WB_SYNC_NONE
,
1456 /* if we used WB_SYNC_ALL, sync_inode waits for the io for the
1457 * inode to finish. So WB_SYNC_NONE is sent down to sync_inode
1458 * and filemap_fdatawrite is used for the data blocks
1460 ret
= sync_inode(inode
, &wbc
);
1462 ret
= filemap_fdatawrite(mapping
);
1467 * write data and metadata corresponding to i1 and i2. The io is
1468 * started but we do not wait for any of it to finish.
1470 * filemap_flush is used for the block device, so if there is a dirty
1471 * page for a block already in flight, we will not wait and start the
1474 int fat_flush_inodes(struct super_block
*sb
, struct inode
*i1
, struct inode
*i2
)
1477 if (!MSDOS_SB(sb
)->options
.flush
)
1480 ret
= writeback_inode(i1
);
1482 ret
= writeback_inode(i2
);
1484 struct address_space
*mapping
= sb
->s_bdev
->bd_inode
->i_mapping
;
1485 ret
= filemap_flush(mapping
);
1489 EXPORT_SYMBOL_GPL(fat_flush_inodes
);
1491 static int __init
init_fat_fs(void)
1495 err
= fat_cache_init();
1499 err
= fat_init_inodecache();
1506 fat_cache_destroy();
1510 static void __exit
exit_fat_fs(void)
1512 fat_cache_destroy();
1513 fat_destroy_inodecache();
1516 module_init(init_fat_fs
)
1517 module_exit(exit_fat_fs
)
1519 MODULE_LICENSE("GPL");