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_write_begin(struct file
*file
, struct address_space
*mapping
,
145 loff_t pos
, unsigned len
, unsigned flags
,
146 struct page
**pagep
, void **fsdata
)
149 return cont_write_begin(file
, mapping
, pos
, len
, flags
, pagep
, fsdata
,
151 &MSDOS_I(mapping
->host
)->mmu_private
);
154 static int fat_write_end(struct file
*file
, struct address_space
*mapping
,
155 loff_t pos
, unsigned len
, unsigned copied
,
156 struct page
*pagep
, void *fsdata
)
158 struct inode
*inode
= mapping
->host
;
160 err
= generic_write_end(file
, mapping
, pos
, len
, copied
, pagep
, fsdata
);
161 if (!(err
< 0) && !(MSDOS_I(inode
)->i_attrs
& ATTR_ARCH
)) {
162 inode
->i_mtime
= inode
->i_ctime
= CURRENT_TIME_SEC
;
163 MSDOS_I(inode
)->i_attrs
|= ATTR_ARCH
;
164 mark_inode_dirty(inode
);
169 static ssize_t
fat_direct_IO(int rw
, struct kiocb
*iocb
,
170 const struct iovec
*iov
,
171 loff_t offset
, unsigned long nr_segs
)
173 struct file
*file
= iocb
->ki_filp
;
174 struct inode
*inode
= file
->f_mapping
->host
;
178 * FIXME: blockdev_direct_IO() doesn't use ->prepare_write(),
179 * so we need to update the ->mmu_private to block boundary.
181 * But we must fill the remaining area or hole by nul for
182 * updating ->mmu_private.
184 * Return 0, and fallback to normal buffered write.
186 loff_t size
= offset
+ iov_length(iov
, nr_segs
);
187 if (MSDOS_I(inode
)->mmu_private
< size
)
192 * FAT need to use the DIO_LOCKING for avoiding the race
193 * condition of fat_get_block() and ->truncate().
195 return blockdev_direct_IO(rw
, iocb
, inode
, inode
->i_sb
->s_bdev
, iov
,
196 offset
, nr_segs
, fat_get_block
, NULL
);
199 static sector_t
_fat_bmap(struct address_space
*mapping
, sector_t block
)
201 return generic_block_bmap(mapping
, block
, fat_get_block
);
204 static const struct address_space_operations fat_aops
= {
205 .readpage
= fat_readpage
,
206 .readpages
= fat_readpages
,
207 .writepage
= fat_writepage
,
208 .writepages
= fat_writepages
,
209 .sync_page
= block_sync_page
,
210 .write_begin
= fat_write_begin
,
211 .write_end
= fat_write_end
,
212 .direct_IO
= fat_direct_IO
,
217 * New FAT inode stuff. We do the following:
218 * a) i_ino is constant and has nothing with on-disk location.
219 * b) FAT manages its own cache of directory entries.
220 * c) *This* cache is indexed by on-disk location.
221 * d) inode has an associated directory entry, all right, but
222 * it may be unhashed.
223 * e) currently entries are stored within struct inode. That should
225 * f) we deal with races in the following way:
226 * 1. readdir() and lookup() do FAT-dir-cache lookup.
227 * 2. rename() unhashes the F-d-c entry and rehashes it in
229 * 3. unlink() and rmdir() unhash F-d-c entry.
230 * 4. fat_write_inode() checks whether the thing is unhashed.
231 * If it is we silently return. If it isn't we do bread(),
232 * check if the location is still valid and retry if it
233 * isn't. Otherwise we do changes.
234 * 5. Spinlock is used to protect hash/unhash/location check/lookup
235 * 6. fat_clear_inode() unhashes the F-d-c entry.
236 * 7. lookup() and readdir() do igrab() if they find a F-d-c entry
237 * and consider negative result as cache miss.
240 static void fat_hash_init(struct super_block
*sb
)
242 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
245 spin_lock_init(&sbi
->inode_hash_lock
);
246 for (i
= 0; i
< FAT_HASH_SIZE
; i
++)
247 INIT_HLIST_HEAD(&sbi
->inode_hashtable
[i
]);
250 static inline unsigned long fat_hash(struct super_block
*sb
, loff_t i_pos
)
252 unsigned long tmp
= (unsigned long)i_pos
| (unsigned long) sb
;
253 tmp
= tmp
+ (tmp
>> FAT_HASH_BITS
) + (tmp
>> FAT_HASH_BITS
* 2);
254 return tmp
& FAT_HASH_MASK
;
257 void fat_attach(struct inode
*inode
, loff_t i_pos
)
259 struct super_block
*sb
= inode
->i_sb
;
260 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
262 spin_lock(&sbi
->inode_hash_lock
);
263 MSDOS_I(inode
)->i_pos
= i_pos
;
264 hlist_add_head(&MSDOS_I(inode
)->i_fat_hash
,
265 sbi
->inode_hashtable
+ fat_hash(sb
, i_pos
));
266 spin_unlock(&sbi
->inode_hash_lock
);
269 EXPORT_SYMBOL_GPL(fat_attach
);
271 void fat_detach(struct inode
*inode
)
273 struct msdos_sb_info
*sbi
= MSDOS_SB(inode
->i_sb
);
274 spin_lock(&sbi
->inode_hash_lock
);
275 MSDOS_I(inode
)->i_pos
= 0;
276 hlist_del_init(&MSDOS_I(inode
)->i_fat_hash
);
277 spin_unlock(&sbi
->inode_hash_lock
);
280 EXPORT_SYMBOL_GPL(fat_detach
);
282 struct inode
*fat_iget(struct super_block
*sb
, loff_t i_pos
)
284 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
285 struct hlist_head
*head
= sbi
->inode_hashtable
+ fat_hash(sb
, i_pos
);
286 struct hlist_node
*_p
;
287 struct msdos_inode_info
*i
;
288 struct inode
*inode
= NULL
;
290 spin_lock(&sbi
->inode_hash_lock
);
291 hlist_for_each_entry(i
, _p
, head
, i_fat_hash
) {
292 BUG_ON(i
->vfs_inode
.i_sb
!= sb
);
293 if (i
->i_pos
!= i_pos
)
295 inode
= igrab(&i
->vfs_inode
);
299 spin_unlock(&sbi
->inode_hash_lock
);
303 static int is_exec(unsigned char *extension
)
305 unsigned char *exe_extensions
= "EXECOMBAT", *walk
;
307 for (walk
= exe_extensions
; *walk
; walk
+= 3)
308 if (!strncmp(extension
, walk
, 3))
313 static int fat_calc_dir_size(struct inode
*inode
)
315 struct msdos_sb_info
*sbi
= MSDOS_SB(inode
->i_sb
);
316 int ret
, fclus
, dclus
;
319 if (MSDOS_I(inode
)->i_start
== 0)
322 ret
= fat_get_cluster(inode
, FAT_ENT_EOF
, &fclus
, &dclus
);
325 inode
->i_size
= (fclus
+ 1) << sbi
->cluster_bits
;
330 /* doesn't deal with root inode */
331 static int fat_fill_inode(struct inode
*inode
, struct msdos_dir_entry
*de
)
333 struct msdos_sb_info
*sbi
= MSDOS_SB(inode
->i_sb
);
336 MSDOS_I(inode
)->i_pos
= 0;
337 inode
->i_uid
= sbi
->options
.fs_uid
;
338 inode
->i_gid
= sbi
->options
.fs_gid
;
340 inode
->i_generation
= get_seconds();
342 if ((de
->attr
& ATTR_DIR
) && !IS_FREE(de
->name
)) {
343 inode
->i_generation
&= ~1;
344 inode
->i_mode
= MSDOS_MKMODE(de
->attr
,
345 S_IRWXUGO
& ~sbi
->options
.fs_dmask
) | S_IFDIR
;
346 inode
->i_op
= sbi
->dir_ops
;
347 inode
->i_fop
= &fat_dir_operations
;
349 MSDOS_I(inode
)->i_start
= le16_to_cpu(de
->start
);
350 if (sbi
->fat_bits
== 32)
351 MSDOS_I(inode
)->i_start
|= (le16_to_cpu(de
->starthi
) << 16);
353 MSDOS_I(inode
)->i_logstart
= MSDOS_I(inode
)->i_start
;
354 error
= fat_calc_dir_size(inode
);
357 MSDOS_I(inode
)->mmu_private
= inode
->i_size
;
359 inode
->i_nlink
= fat_subdirs(inode
);
360 } else { /* not a directory */
361 inode
->i_generation
|= 1;
362 inode
->i_mode
= MSDOS_MKMODE(de
->attr
,
363 ((sbi
->options
.showexec
&& !is_exec(de
->name
+ 8))
364 ? S_IRUGO
|S_IWUGO
: S_IRWXUGO
)
365 & ~sbi
->options
.fs_fmask
) | S_IFREG
;
366 MSDOS_I(inode
)->i_start
= le16_to_cpu(de
->start
);
367 if (sbi
->fat_bits
== 32)
368 MSDOS_I(inode
)->i_start
|= (le16_to_cpu(de
->starthi
) << 16);
370 MSDOS_I(inode
)->i_logstart
= MSDOS_I(inode
)->i_start
;
371 inode
->i_size
= le32_to_cpu(de
->size
);
372 inode
->i_op
= &fat_file_inode_operations
;
373 inode
->i_fop
= &fat_file_operations
;
374 inode
->i_mapping
->a_ops
= &fat_aops
;
375 MSDOS_I(inode
)->mmu_private
= inode
->i_size
;
377 if (de
->attr
& ATTR_SYS
) {
378 if (sbi
->options
.sys_immutable
)
379 inode
->i_flags
|= S_IMMUTABLE
;
381 MSDOS_I(inode
)->i_attrs
= de
->attr
& ATTR_UNUSED
;
382 inode
->i_blocks
= ((inode
->i_size
+ (sbi
->cluster_size
- 1))
383 & ~((loff_t
)sbi
->cluster_size
- 1)) >> 9;
384 inode
->i_mtime
.tv_sec
=
385 date_dos2unix(le16_to_cpu(de
->time
), le16_to_cpu(de
->date
),
386 sbi
->options
.tz_utc
);
387 inode
->i_mtime
.tv_nsec
= 0;
388 if (sbi
->options
.isvfat
) {
389 int secs
= de
->ctime_cs
/ 100;
390 int csecs
= de
->ctime_cs
% 100;
391 inode
->i_ctime
.tv_sec
=
392 date_dos2unix(le16_to_cpu(de
->ctime
),
393 le16_to_cpu(de
->cdate
),
394 sbi
->options
.tz_utc
) + secs
;
395 inode
->i_ctime
.tv_nsec
= csecs
* 10000000;
396 inode
->i_atime
.tv_sec
=
397 date_dos2unix(0, le16_to_cpu(de
->adate
),
398 sbi
->options
.tz_utc
);
399 inode
->i_atime
.tv_nsec
= 0;
401 inode
->i_ctime
= inode
->i_atime
= inode
->i_mtime
;
406 struct inode
*fat_build_inode(struct super_block
*sb
,
407 struct msdos_dir_entry
*de
, loff_t i_pos
)
412 inode
= fat_iget(sb
, i_pos
);
415 inode
= new_inode(sb
);
417 inode
= ERR_PTR(-ENOMEM
);
420 inode
->i_ino
= iunique(sb
, MSDOS_ROOT_INO
);
421 inode
->i_version
= 1;
422 err
= fat_fill_inode(inode
, de
);
425 inode
= ERR_PTR(err
);
428 fat_attach(inode
, i_pos
);
429 insert_inode_hash(inode
);
434 EXPORT_SYMBOL_GPL(fat_build_inode
);
436 static void fat_delete_inode(struct inode
*inode
)
438 truncate_inode_pages(&inode
->i_data
, 0);
444 static void fat_clear_inode(struct inode
*inode
)
446 struct super_block
*sb
= inode
->i_sb
;
447 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
449 spin_lock(&sbi
->inode_hash_lock
);
450 fat_cache_inval_inode(inode
);
451 hlist_del_init(&MSDOS_I(inode
)->i_fat_hash
);
452 spin_unlock(&sbi
->inode_hash_lock
);
455 static void fat_write_super(struct super_block
*sb
)
459 if (!(sb
->s_flags
& MS_RDONLY
))
460 fat_clusters_flush(sb
);
463 static void fat_put_super(struct super_block
*sb
)
465 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
468 unload_nls(sbi
->nls_disk
);
469 sbi
->nls_disk
= NULL
;
470 sbi
->options
.codepage
= fat_default_codepage
;
473 unload_nls(sbi
->nls_io
);
476 if (sbi
->options
.iocharset
!= fat_default_iocharset
) {
477 kfree(sbi
->options
.iocharset
);
478 sbi
->options
.iocharset
= fat_default_iocharset
;
481 sb
->s_fs_info
= NULL
;
485 static struct kmem_cache
*fat_inode_cachep
;
487 static struct inode
*fat_alloc_inode(struct super_block
*sb
)
489 struct msdos_inode_info
*ei
;
490 ei
= kmem_cache_alloc(fat_inode_cachep
, GFP_NOFS
);
493 return &ei
->vfs_inode
;
496 static void fat_destroy_inode(struct inode
*inode
)
498 kmem_cache_free(fat_inode_cachep
, MSDOS_I(inode
));
501 static void init_once(void *foo
)
503 struct msdos_inode_info
*ei
= (struct msdos_inode_info
*)foo
;
505 spin_lock_init(&ei
->cache_lru_lock
);
507 ei
->cache_valid_id
= FAT_CACHE_VALID
+ 1;
508 INIT_LIST_HEAD(&ei
->cache_lru
);
509 INIT_HLIST_NODE(&ei
->i_fat_hash
);
510 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 || !sbi
->free_clus_valid
) {
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
,
598 &raw_entry
->date
, sbi
->options
.tz_utc
);
599 if (sbi
->options
.isvfat
) {
601 fat_date_unix2dos(inode
->i_ctime
.tv_sec
, &raw_entry
->ctime
,
602 &raw_entry
->cdate
, sbi
->options
.tz_utc
);
603 fat_date_unix2dos(inode
->i_atime
.tv_sec
, &atime
,
604 &raw_entry
->adate
, sbi
->options
.tz_utc
);
605 raw_entry
->ctime_cs
= (inode
->i_ctime
.tv_sec
& 1) * 100 +
606 inode
->i_ctime
.tv_nsec
/ 10000000;
608 spin_unlock(&sbi
->inode_hash_lock
);
609 mark_buffer_dirty(bh
);
611 err
= sync_dirty_buffer(bh
);
618 int fat_sync_inode(struct inode
*inode
)
620 return fat_write_inode(inode
, 1);
623 EXPORT_SYMBOL_GPL(fat_sync_inode
);
625 static int fat_show_options(struct seq_file
*m
, struct vfsmount
*mnt
);
626 static const struct super_operations fat_sops
= {
627 .alloc_inode
= fat_alloc_inode
,
628 .destroy_inode
= fat_destroy_inode
,
629 .write_inode
= fat_write_inode
,
630 .delete_inode
= fat_delete_inode
,
631 .put_super
= fat_put_super
,
632 .write_super
= fat_write_super
,
633 .statfs
= fat_statfs
,
634 .clear_inode
= fat_clear_inode
,
635 .remount_fs
= fat_remount
,
637 .show_options
= fat_show_options
,
641 * a FAT file handle with fhtype 3 is
642 * 0/ i_ino - for fast, reliable lookup if still in the cache
643 * 1/ i_generation - to see if i_ino is still valid
644 * bit 0 == 0 iff directory
645 * 2/ i_pos(8-39) - if ino has changed, but still in cache
646 * 3/ i_pos(4-7)|i_logstart - to semi-verify inode found at i_pos
647 * 4/ i_pos(0-3)|parent->i_logstart - maybe used to hunt for the file on disc
649 * Hack for NFSv2: Maximum FAT entry number is 28bits and maximum
650 * i_pos is 40bits (blocknr(32) + dir offset(8)), so two 4bits
651 * of i_logstart is used to store the directory entry offset.
654 static struct dentry
*fat_fh_to_dentry(struct super_block
*sb
,
655 struct fid
*fid
, int fh_len
, int fh_type
)
657 struct inode
*inode
= NULL
;
658 struct dentry
*result
;
661 if (fh_len
< 5 || fh_type
!= 3)
664 inode
= ilookup(sb
, fh
[0]);
665 if (!inode
|| inode
->i_generation
!= fh
[1]) {
672 int i_logstart
= fh
[3] & 0x0fffffff;
674 i_pos
= (loff_t
)fh
[2] << 8;
675 i_pos
|= ((fh
[3] >> 24) & 0xf0) | (fh
[4] >> 28);
677 /* try 2 - see if i_pos is in F-d-c
678 * require i_logstart to be the same
679 * Will fail if you truncate and then re-write
682 inode
= fat_iget(sb
, i_pos
);
683 if (inode
&& MSDOS_I(inode
)->i_logstart
!= i_logstart
) {
689 /* For now, do nothing
690 * What we could do is:
691 * follow the file starting at fh[4], and record
692 * the ".." entry, and the name of the fh[2] entry.
693 * The follow the ".." file finding the next step up.
694 * This way we build a path to the root of
695 * the tree. If this works, we lookup the path and so
696 * get this inode into the cache.
697 * Finally try the fat_iget lookup again
698 * If that fails, then weare totally out of luck
699 * But all that is for another day
703 return ERR_PTR(-ESTALE
);
706 /* now to find a dentry.
707 * If possible, get a well-connected one
709 result
= d_alloc_anon(inode
);
710 if (result
== NULL
) {
712 return ERR_PTR(-ENOMEM
);
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
= ERR_CAST(inode
);
765 parent
= d_alloc_anon(inode
);
768 parent
= ERR_PTR(-ENOMEM
);
776 static const struct export_operations fat_export_ops
= {
777 .encode_fh
= fat_encode_fh
,
778 .fh_to_dentry
= fat_fh_to_dentry
,
779 .get_parent
= fat_get_parent
,
782 static int fat_show_options(struct seq_file
*m
, struct vfsmount
*mnt
)
784 struct msdos_sb_info
*sbi
= MSDOS_SB(mnt
->mnt_sb
);
785 struct fat_mount_options
*opts
= &sbi
->options
;
786 int isvfat
= opts
->isvfat
;
788 if (opts
->fs_uid
!= 0)
789 seq_printf(m
, ",uid=%u", opts
->fs_uid
);
790 if (opts
->fs_gid
!= 0)
791 seq_printf(m
, ",gid=%u", opts
->fs_gid
);
792 seq_printf(m
, ",fmask=%04o", opts
->fs_fmask
);
793 seq_printf(m
, ",dmask=%04o", opts
->fs_dmask
);
794 if (opts
->allow_utime
)
795 seq_printf(m
, ",allow_utime=%04o", opts
->allow_utime
);
797 seq_printf(m
, ",codepage=%s", sbi
->nls_disk
->charset
);
800 seq_printf(m
, ",iocharset=%s", sbi
->nls_io
->charset
);
802 switch (opts
->shortname
) {
803 case VFAT_SFN_DISPLAY_WIN95
| VFAT_SFN_CREATE_WIN95
:
804 seq_puts(m
, ",shortname=win95");
806 case VFAT_SFN_DISPLAY_WINNT
| VFAT_SFN_CREATE_WINNT
:
807 seq_puts(m
, ",shortname=winnt");
809 case VFAT_SFN_DISPLAY_WINNT
| VFAT_SFN_CREATE_WIN95
:
810 seq_puts(m
, ",shortname=mixed");
812 case VFAT_SFN_DISPLAY_LOWER
| VFAT_SFN_CREATE_WIN95
:
813 /* seq_puts(m, ",shortname=lower"); */
816 seq_puts(m
, ",shortname=unknown");
820 if (opts
->name_check
!= 'n')
821 seq_printf(m
, ",check=%c", opts
->name_check
);
823 seq_puts(m
, ",usefree");
825 seq_puts(m
, ",quiet");
827 seq_puts(m
, ",showexec");
828 if (opts
->sys_immutable
)
829 seq_puts(m
, ",sys_immutable");
832 seq_puts(m
, ",dotsOK=yes");
834 seq_puts(m
, ",nocase");
837 seq_puts(m
, ",utf8");
838 if (opts
->unicode_xlate
)
839 seq_puts(m
, ",uni_xlate");
841 seq_puts(m
, ",nonumtail");
843 if (sbi
->options
.flush
)
844 seq_puts(m
, ",flush");
846 seq_puts(m
, ",tz=UTC");
852 Opt_check_n
, Opt_check_r
, Opt_check_s
, Opt_uid
, Opt_gid
,
853 Opt_umask
, Opt_dmask
, Opt_fmask
, Opt_allow_utime
, Opt_codepage
,
854 Opt_usefree
, Opt_nocase
, Opt_quiet
, Opt_showexec
, Opt_debug
,
855 Opt_immutable
, 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_tz_utc
, 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_allow_utime
, "allow_utime=%o"},
875 {Opt_codepage
, "codepage=%u"},
876 {Opt_usefree
, "usefree"},
877 {Opt_nocase
, "nocase"},
878 {Opt_quiet
, "quiet"},
879 {Opt_showexec
, "showexec"},
880 {Opt_debug
, "debug"},
881 {Opt_immutable
, "sys_immutable"},
882 {Opt_obsolate
, "conv=binary"},
883 {Opt_obsolate
, "conv=text"},
884 {Opt_obsolate
, "conv=auto"},
885 {Opt_obsolate
, "conv=b"},
886 {Opt_obsolate
, "conv=t"},
887 {Opt_obsolate
, "conv=a"},
888 {Opt_obsolate
, "fat=%u"},
889 {Opt_obsolate
, "blocksize=%u"},
890 {Opt_obsolate
, "cvf_format=%20s"},
891 {Opt_obsolate
, "cvf_options=%100s"},
892 {Opt_obsolate
, "posix"},
893 {Opt_flush
, "flush"},
894 {Opt_tz_utc
, "tz=UTC"},
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
->allow_utime
= -1;
948 opts
->codepage
= fat_default_codepage
;
949 opts
->iocharset
= fat_default_iocharset
;
951 opts
->shortname
= VFAT_SFN_DISPLAY_LOWER
|VFAT_SFN_CREATE_WIN95
;
954 opts
->name_check
= 'n';
955 opts
->quiet
= opts
->showexec
= opts
->sys_immutable
= opts
->dotsOK
= 0;
956 opts
->utf8
= opts
->unicode_xlate
= 0;
958 opts
->usefree
= opts
->nocase
= 0;
965 while ((p
= strsep(&options
, ",")) != NULL
) {
970 token
= match_token(p
, fat_tokens
, args
);
971 if (token
== Opt_err
) {
973 token
= match_token(p
, vfat_tokens
, args
);
975 token
= match_token(p
, msdos_tokens
, args
);
979 opts
->name_check
= 's';
982 opts
->name_check
= 'r';
985 opts
->name_check
= 'n';
994 /* for backward compatibility */
995 opts
->shortname
= VFAT_SFN_DISPLAY_WIN95
996 | VFAT_SFN_CREATE_WIN95
;
1009 opts
->sys_immutable
= 1;
1012 if (match_int(&args
[0], &option
))
1014 opts
->fs_uid
= option
;
1017 if (match_int(&args
[0], &option
))
1019 opts
->fs_gid
= option
;
1022 if (match_octal(&args
[0], &option
))
1024 opts
->fs_fmask
= opts
->fs_dmask
= option
;
1027 if (match_octal(&args
[0], &option
))
1029 opts
->fs_dmask
= option
;
1032 if (match_octal(&args
[0], &option
))
1034 opts
->fs_fmask
= option
;
1036 case Opt_allow_utime
:
1037 if (match_octal(&args
[0], &option
))
1039 opts
->allow_utime
= option
& (S_IWGRP
| S_IWOTH
);
1042 if (match_int(&args
[0], &option
))
1044 opts
->codepage
= option
;
1053 /* msdos specific */
1063 if (opts
->iocharset
!= fat_default_iocharset
)
1064 kfree(opts
->iocharset
);
1065 iocharset
= match_strdup(&args
[0]);
1068 opts
->iocharset
= iocharset
;
1070 case Opt_shortname_lower
:
1071 opts
->shortname
= VFAT_SFN_DISPLAY_LOWER
1072 | VFAT_SFN_CREATE_WIN95
;
1074 case Opt_shortname_win95
:
1075 opts
->shortname
= VFAT_SFN_DISPLAY_WIN95
1076 | VFAT_SFN_CREATE_WIN95
;
1078 case Opt_shortname_winnt
:
1079 opts
->shortname
= VFAT_SFN_DISPLAY_WINNT
1080 | VFAT_SFN_CREATE_WINNT
;
1082 case Opt_shortname_mixed
:
1083 opts
->shortname
= VFAT_SFN_DISPLAY_WINNT
1084 | VFAT_SFN_CREATE_WIN95
;
1086 case Opt_utf8_no
: /* 0 or no or false */
1089 case Opt_utf8_yes
: /* empty or 1 or yes or true */
1092 case Opt_uni_xl_no
: /* 0 or no or false */
1093 opts
->unicode_xlate
= 0;
1095 case Opt_uni_xl_yes
: /* empty or 1 or yes or true */
1096 opts
->unicode_xlate
= 1;
1098 case Opt_nonumtail_no
: /* 0 or no or false */
1099 opts
->numtail
= 1; /* negated option */
1101 case Opt_nonumtail_yes
: /* empty or 1 or yes or true */
1102 opts
->numtail
= 0; /* negated option */
1105 /* obsolete mount options */
1107 printk(KERN_INFO
"FAT: \"%s\" option is obsolete, "
1108 "not supported now\n", p
);
1110 /* unknown option */
1114 "FAT: Unrecognized mount option \"%s\" "
1115 "or missing value\n", p
);
1122 /* UTF-8 doesn't provide FAT semantics */
1123 if (!strcmp(opts
->iocharset
, "utf8")) {
1124 printk(KERN_ERR
"FAT: utf8 is not a recommended IO charset"
1125 " for FAT filesystems, filesystem will be "
1126 "case sensitive!\n");
1129 /* If user doesn't specify allow_utime, it's initialized from dmask. */
1130 if (opts
->allow_utime
== (unsigned short)-1)
1131 opts
->allow_utime
= ~opts
->fs_dmask
& (S_IWGRP
| S_IWOTH
);
1132 if (opts
->unicode_xlate
)
1138 static int fat_read_root(struct inode
*inode
)
1140 struct super_block
*sb
= inode
->i_sb
;
1141 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
1144 MSDOS_I(inode
)->i_pos
= 0;
1145 inode
->i_uid
= sbi
->options
.fs_uid
;
1146 inode
->i_gid
= sbi
->options
.fs_gid
;
1148 inode
->i_generation
= 0;
1149 inode
->i_mode
= (S_IRWXUGO
& ~sbi
->options
.fs_dmask
) | S_IFDIR
;
1150 inode
->i_op
= sbi
->dir_ops
;
1151 inode
->i_fop
= &fat_dir_operations
;
1152 if (sbi
->fat_bits
== 32) {
1153 MSDOS_I(inode
)->i_start
= sbi
->root_cluster
;
1154 error
= fat_calc_dir_size(inode
);
1158 MSDOS_I(inode
)->i_start
= 0;
1159 inode
->i_size
= sbi
->dir_entries
* sizeof(struct msdos_dir_entry
);
1161 inode
->i_blocks
= ((inode
->i_size
+ (sbi
->cluster_size
- 1))
1162 & ~((loff_t
)sbi
->cluster_size
- 1)) >> 9;
1163 MSDOS_I(inode
)->i_logstart
= 0;
1164 MSDOS_I(inode
)->mmu_private
= inode
->i_size
;
1166 MSDOS_I(inode
)->i_attrs
= ATTR_NONE
;
1167 inode
->i_mtime
.tv_sec
= inode
->i_atime
.tv_sec
= inode
->i_ctime
.tv_sec
= 0;
1168 inode
->i_mtime
.tv_nsec
= inode
->i_atime
.tv_nsec
= inode
->i_ctime
.tv_nsec
= 0;
1169 inode
->i_nlink
= fat_subdirs(inode
)+2;
1175 * Read the super block of an MS-DOS FS.
1177 int fat_fill_super(struct super_block
*sb
, void *data
, int silent
,
1178 const struct inode_operations
*fs_dir_inode_ops
, int isvfat
)
1180 struct inode
*root_inode
= NULL
;
1181 struct buffer_head
*bh
;
1182 struct fat_boot_sector
*b
;
1183 struct msdos_sb_info
*sbi
;
1184 u16 logical_sector_size
;
1185 u32 total_sectors
, total_clusters
, fat_clusters
, rootdir_sectors
;
1192 * GFP_KERNEL is ok here, because while we do hold the
1193 * supeblock lock, memory pressure can't call back into
1194 * the filesystem, since we're only just about to mount
1195 * it and have no inodes etc active!
1197 sbi
= kzalloc(sizeof(struct msdos_sb_info
), GFP_KERNEL
);
1200 sb
->s_fs_info
= sbi
;
1202 sb
->s_flags
|= MS_NODIRATIME
;
1203 sb
->s_magic
= MSDOS_SUPER_MAGIC
;
1204 sb
->s_op
= &fat_sops
;
1205 sb
->s_export_op
= &fat_export_ops
;
1206 sbi
->dir_ops
= fs_dir_inode_ops
;
1208 error
= parse_options(data
, isvfat
, silent
, &debug
, &sbi
->options
);
1213 sb_min_blocksize(sb
, 512);
1214 bh
= sb_bread(sb
, 0);
1216 printk(KERN_ERR
"FAT: unable to read boot sector\n");
1220 b
= (struct fat_boot_sector
*) bh
->b_data
;
1223 printk(KERN_ERR
"FAT: bogus number of reserved sectors\n");
1229 printk(KERN_ERR
"FAT: bogus number of FAT structure\n");
1235 * Earlier we checked here that b->secs_track and b->head are nonzero,
1236 * but it turns out valid FAT filesystems can have zero there.
1240 if (!fat_valid_media(media
)) {
1242 printk(KERN_ERR
"FAT: invalid media value (0x%02x)\n",
1247 logical_sector_size
= get_unaligned_le16(&b
->sector_size
);
1248 if (!is_power_of_2(logical_sector_size
)
1249 || (logical_sector_size
< 512)
1250 || (logical_sector_size
> 4096)) {
1252 printk(KERN_ERR
"FAT: bogus logical sector size %u\n",
1253 logical_sector_size
);
1257 sbi
->sec_per_clus
= b
->sec_per_clus
;
1258 if (!is_power_of_2(sbi
->sec_per_clus
)) {
1260 printk(KERN_ERR
"FAT: bogus sectors per cluster %u\n",
1266 if (logical_sector_size
< sb
->s_blocksize
) {
1267 printk(KERN_ERR
"FAT: logical sector size too small for device"
1268 " (logical sector size = %u)\n", logical_sector_size
);
1272 if (logical_sector_size
> sb
->s_blocksize
) {
1275 if (!sb_set_blocksize(sb
, logical_sector_size
)) {
1276 printk(KERN_ERR
"FAT: unable to set blocksize %u\n",
1277 logical_sector_size
);
1280 bh
= sb_bread(sb
, 0);
1282 printk(KERN_ERR
"FAT: unable to read boot sector"
1283 " (logical sector size = %lu)\n",
1287 b
= (struct fat_boot_sector
*) bh
->b_data
;
1290 sbi
->cluster_size
= sb
->s_blocksize
* sbi
->sec_per_clus
;
1291 sbi
->cluster_bits
= ffs(sbi
->cluster_size
) - 1;
1292 sbi
->fats
= b
->fats
;
1293 sbi
->fat_bits
= 0; /* Don't know yet */
1294 sbi
->fat_start
= le16_to_cpu(b
->reserved
);
1295 sbi
->fat_length
= le16_to_cpu(b
->fat_length
);
1296 sbi
->root_cluster
= 0;
1297 sbi
->free_clusters
= -1; /* Don't know yet */
1298 sbi
->free_clus_valid
= 0;
1299 sbi
->prev_free
= FAT_START_ENT
;
1301 if (!sbi
->fat_length
&& b
->fat32_length
) {
1302 struct fat_boot_fsinfo
*fsinfo
;
1303 struct buffer_head
*fsinfo_bh
;
1307 sbi
->fat_length
= le32_to_cpu(b
->fat32_length
);
1308 sbi
->root_cluster
= le32_to_cpu(b
->root_cluster
);
1310 sb
->s_maxbytes
= 0xffffffff;
1312 /* MC - if info_sector is 0, don't multiply by 0 */
1313 sbi
->fsinfo_sector
= le16_to_cpu(b
->info_sector
);
1314 if (sbi
->fsinfo_sector
== 0)
1315 sbi
->fsinfo_sector
= 1;
1317 fsinfo_bh
= sb_bread(sb
, sbi
->fsinfo_sector
);
1318 if (fsinfo_bh
== NULL
) {
1319 printk(KERN_ERR
"FAT: bread failed, FSINFO block"
1320 " (sector = %lu)\n", sbi
->fsinfo_sector
);
1325 fsinfo
= (struct fat_boot_fsinfo
*)fsinfo_bh
->b_data
;
1326 if (!IS_FSINFO(fsinfo
)) {
1327 printk(KERN_WARNING
"FAT: Invalid FSINFO signature: "
1328 "0x%08x, 0x%08x (sector = %lu)\n",
1329 le32_to_cpu(fsinfo
->signature1
),
1330 le32_to_cpu(fsinfo
->signature2
),
1331 sbi
->fsinfo_sector
);
1333 if (sbi
->options
.usefree
)
1334 sbi
->free_clus_valid
= 1;
1335 sbi
->free_clusters
= le32_to_cpu(fsinfo
->free_clusters
);
1336 sbi
->prev_free
= le32_to_cpu(fsinfo
->next_cluster
);
1342 sbi
->dir_per_block
= sb
->s_blocksize
/ sizeof(struct msdos_dir_entry
);
1343 sbi
->dir_per_block_bits
= ffs(sbi
->dir_per_block
) - 1;
1345 sbi
->dir_start
= sbi
->fat_start
+ sbi
->fats
* sbi
->fat_length
;
1346 sbi
->dir_entries
= get_unaligned_le16(&b
->dir_entries
);
1347 if (sbi
->dir_entries
& (sbi
->dir_per_block
- 1)) {
1349 printk(KERN_ERR
"FAT: bogus directroy-entries per block"
1350 " (%u)\n", sbi
->dir_entries
);
1355 rootdir_sectors
= sbi
->dir_entries
1356 * sizeof(struct msdos_dir_entry
) / sb
->s_blocksize
;
1357 sbi
->data_start
= sbi
->dir_start
+ rootdir_sectors
;
1358 total_sectors
= get_unaligned_le16(&b
->sectors
);
1359 if (total_sectors
== 0)
1360 total_sectors
= le32_to_cpu(b
->total_sect
);
1362 total_clusters
= (total_sectors
- sbi
->data_start
) / sbi
->sec_per_clus
;
1364 if (sbi
->fat_bits
!= 32)
1365 sbi
->fat_bits
= (total_clusters
> MAX_FAT12
) ? 16 : 12;
1367 /* check that FAT table does not overflow */
1368 fat_clusters
= sbi
->fat_length
* sb
->s_blocksize
* 8 / sbi
->fat_bits
;
1369 total_clusters
= min(total_clusters
, fat_clusters
- FAT_START_ENT
);
1370 if (total_clusters
> MAX_FAT(sb
)) {
1372 printk(KERN_ERR
"FAT: count of clusters too big (%u)\n",
1378 sbi
->max_cluster
= total_clusters
+ FAT_START_ENT
;
1379 /* check the free_clusters, it's not necessarily correct */
1380 if (sbi
->free_clusters
!= -1 && sbi
->free_clusters
> total_clusters
)
1381 sbi
->free_clusters
= -1;
1382 /* check the prev_free, it's not necessarily correct */
1383 sbi
->prev_free
%= sbi
->max_cluster
;
1384 if (sbi
->prev_free
< FAT_START_ENT
)
1385 sbi
->prev_free
= FAT_START_ENT
;
1389 /* set up enough so that it can read an inode */
1391 fat_ent_access_init(sb
);
1394 * The low byte of FAT's first entry must have same value with
1395 * media-field. But in real world, too many devices is
1396 * writing wrong value. So, removed that validity check.
1398 * if (FAT_FIRST_ENT(sb, media) != first)
1402 sprintf(buf
, "cp%d", sbi
->options
.codepage
);
1403 sbi
->nls_disk
= load_nls(buf
);
1404 if (!sbi
->nls_disk
) {
1405 printk(KERN_ERR
"FAT: codepage %s not found\n", buf
);
1409 /* FIXME: utf8 is using iocharset for upper/lower conversion */
1410 if (sbi
->options
.isvfat
) {
1411 sbi
->nls_io
= load_nls(sbi
->options
.iocharset
);
1413 printk(KERN_ERR
"FAT: IO charset %s not found\n",
1414 sbi
->options
.iocharset
);
1420 root_inode
= new_inode(sb
);
1423 root_inode
->i_ino
= MSDOS_ROOT_INO
;
1424 root_inode
->i_version
= 1;
1425 error
= fat_read_root(root_inode
);
1429 insert_inode_hash(root_inode
);
1430 sb
->s_root
= d_alloc_root(root_inode
);
1432 printk(KERN_ERR
"FAT: get root inode failed\n");
1441 printk(KERN_INFO
"VFS: Can't find a valid FAT filesystem"
1442 " on dev %s.\n", sb
->s_id
);
1448 unload_nls(sbi
->nls_io
);
1450 unload_nls(sbi
->nls_disk
);
1451 if (sbi
->options
.iocharset
!= fat_default_iocharset
)
1452 kfree(sbi
->options
.iocharset
);
1453 sb
->s_fs_info
= NULL
;
1458 EXPORT_SYMBOL_GPL(fat_fill_super
);
1461 * helper function for fat_flush_inodes. This writes both the inode
1462 * and the file data blocks, waiting for in flight data blocks before
1463 * the start of the call. It does not wait for any io started
1466 static int writeback_inode(struct inode
*inode
)
1470 struct address_space
*mapping
= inode
->i_mapping
;
1471 struct writeback_control wbc
= {
1472 .sync_mode
= WB_SYNC_NONE
,
1475 /* if we used WB_SYNC_ALL, sync_inode waits for the io for the
1476 * inode to finish. So WB_SYNC_NONE is sent down to sync_inode
1477 * and filemap_fdatawrite is used for the data blocks
1479 ret
= sync_inode(inode
, &wbc
);
1481 ret
= filemap_fdatawrite(mapping
);
1486 * write data and metadata corresponding to i1 and i2. The io is
1487 * started but we do not wait for any of it to finish.
1489 * filemap_flush is used for the block device, so if there is a dirty
1490 * page for a block already in flight, we will not wait and start the
1493 int fat_flush_inodes(struct super_block
*sb
, struct inode
*i1
, struct inode
*i2
)
1496 if (!MSDOS_SB(sb
)->options
.flush
)
1499 ret
= writeback_inode(i1
);
1501 ret
= writeback_inode(i2
);
1503 struct address_space
*mapping
= sb
->s_bdev
->bd_inode
->i_mapping
;
1504 ret
= filemap_flush(mapping
);
1508 EXPORT_SYMBOL_GPL(fat_flush_inodes
);
1510 static int __init
init_fat_fs(void)
1514 err
= fat_cache_init();
1518 err
= fat_init_inodecache();
1525 fat_cache_destroy();
1529 static void __exit
exit_fat_fs(void)
1531 fat_cache_destroy();
1532 fat_destroy_inodecache();
1535 module_init(init_fat_fs
)
1536 module_exit(exit_fat_fs
)
1538 MODULE_LICENSE("GPL");