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/buffer_head.h>
22 #include <linux/mount.h>
23 #include <linux/vfs.h>
24 #include <linux/parser.h>
25 #include <asm/unaligned.h>
27 #ifndef CONFIG_FAT_DEFAULT_IOCHARSET
28 /* if user don't select VFAT, this is undefined. */
29 #define CONFIG_FAT_DEFAULT_IOCHARSET ""
32 static int fat_default_codepage
= CONFIG_FAT_DEFAULT_CODEPAGE
;
33 static char fat_default_iocharset
[] = CONFIG_FAT_DEFAULT_IOCHARSET
;
36 static int fat_add_cluster(struct inode
*inode
)
40 err
= fat_alloc_clusters(inode
, &cluster
, 1);
43 /* FIXME: this cluster should be added after data of this
44 * cluster is writed */
45 err
= fat_chain_add(inode
, cluster
, 1);
47 fat_free_clusters(inode
, cluster
);
51 static int fat_get_block(struct inode
*inode
, sector_t iblock
,
52 struct buffer_head
*bh_result
, int create
)
54 struct super_block
*sb
= inode
->i_sb
;
58 err
= fat_bmap(inode
, iblock
, &phys
);
62 map_bh(bh_result
, sb
, phys
);
67 if (iblock
!= MSDOS_I(inode
)->mmu_private
>> sb
->s_blocksize_bits
) {
68 fat_fs_panic(sb
, "corrupted file size (i_pos %lld, %lld)",
69 MSDOS_I(inode
)->i_pos
, MSDOS_I(inode
)->mmu_private
);
72 if (!((unsigned long)iblock
& (MSDOS_SB(sb
)->sec_per_clus
- 1))) {
73 err
= fat_add_cluster(inode
);
77 MSDOS_I(inode
)->mmu_private
+= sb
->s_blocksize
;
78 err
= fat_bmap(inode
, iblock
, &phys
);
83 set_buffer_new(bh_result
);
84 map_bh(bh_result
, sb
, phys
);
88 static int fat_writepage(struct page
*page
, struct writeback_control
*wbc
)
90 return block_write_full_page(page
, fat_get_block
, wbc
);
93 static int fat_readpage(struct file
*file
, struct page
*page
)
95 return block_read_full_page(page
, fat_get_block
);
98 static int fat_prepare_write(struct file
*file
, struct page
*page
,
99 unsigned from
, unsigned to
)
101 return cont_prepare_write(page
, from
, to
, fat_get_block
,
102 &MSDOS_I(page
->mapping
->host
)->mmu_private
);
105 static int fat_commit_write(struct file
*file
, struct page
*page
,
106 unsigned from
, unsigned to
)
108 struct inode
*inode
= page
->mapping
->host
;
109 int err
= generic_commit_write(file
, page
, from
, to
);
110 if (!err
&& !(MSDOS_I(inode
)->i_attrs
& ATTR_ARCH
)) {
111 inode
->i_mtime
= inode
->i_ctime
= CURRENT_TIME_SEC
;
112 MSDOS_I(inode
)->i_attrs
|= ATTR_ARCH
;
113 mark_inode_dirty(inode
);
118 static sector_t
_fat_bmap(struct address_space
*mapping
, sector_t block
)
120 return generic_block_bmap(mapping
, block
, fat_get_block
);
123 static struct address_space_operations fat_aops
= {
124 .readpage
= fat_readpage
,
125 .writepage
= fat_writepage
,
126 .sync_page
= block_sync_page
,
127 .prepare_write
= fat_prepare_write
,
128 .commit_write
= fat_commit_write
,
133 * New FAT inode stuff. We do the following:
134 * a) i_ino is constant and has nothing with on-disk location.
135 * b) FAT manages its own cache of directory entries.
136 * c) *This* cache is indexed by on-disk location.
137 * d) inode has an associated directory entry, all right, but
138 * it may be unhashed.
139 * e) currently entries are stored within struct inode. That should
141 * f) we deal with races in the following way:
142 * 1. readdir() and lookup() do FAT-dir-cache lookup.
143 * 2. rename() unhashes the F-d-c entry and rehashes it in
145 * 3. unlink() and rmdir() unhash F-d-c entry.
146 * 4. fat_write_inode() checks whether the thing is unhashed.
147 * If it is we silently return. If it isn't we do bread(),
148 * check if the location is still valid and retry if it
149 * isn't. Otherwise we do changes.
150 * 5. Spinlock is used to protect hash/unhash/location check/lookup
151 * 6. fat_clear_inode() unhashes the F-d-c entry.
152 * 7. lookup() and readdir() do igrab() if they find a F-d-c entry
153 * and consider negative result as cache miss.
156 static void fat_hash_init(struct super_block
*sb
)
158 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
161 spin_lock_init(&sbi
->inode_hash_lock
);
162 for (i
= 0; i
< FAT_HASH_SIZE
; i
++)
163 INIT_HLIST_HEAD(&sbi
->inode_hashtable
[i
]);
166 static inline unsigned long fat_hash(struct super_block
*sb
, loff_t i_pos
)
168 unsigned long tmp
= (unsigned long)i_pos
| (unsigned long) sb
;
169 tmp
= tmp
+ (tmp
>> FAT_HASH_BITS
) + (tmp
>> FAT_HASH_BITS
* 2);
170 return tmp
& FAT_HASH_MASK
;
173 void fat_attach(struct inode
*inode
, loff_t i_pos
)
175 struct super_block
*sb
= inode
->i_sb
;
176 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
178 spin_lock(&sbi
->inode_hash_lock
);
179 MSDOS_I(inode
)->i_pos
= i_pos
;
180 hlist_add_head(&MSDOS_I(inode
)->i_fat_hash
,
181 sbi
->inode_hashtable
+ fat_hash(sb
, i_pos
));
182 spin_unlock(&sbi
->inode_hash_lock
);
185 EXPORT_SYMBOL(fat_attach
);
187 void fat_detach(struct inode
*inode
)
189 struct msdos_sb_info
*sbi
= MSDOS_SB(inode
->i_sb
);
190 spin_lock(&sbi
->inode_hash_lock
);
191 MSDOS_I(inode
)->i_pos
= 0;
192 hlist_del_init(&MSDOS_I(inode
)->i_fat_hash
);
193 spin_unlock(&sbi
->inode_hash_lock
);
196 EXPORT_SYMBOL(fat_detach
);
198 struct inode
*fat_iget(struct super_block
*sb
, loff_t i_pos
)
200 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
201 struct hlist_head
*head
= sbi
->inode_hashtable
+ fat_hash(sb
, i_pos
);
202 struct hlist_node
*_p
;
203 struct msdos_inode_info
*i
;
204 struct inode
*inode
= NULL
;
206 spin_lock(&sbi
->inode_hash_lock
);
207 hlist_for_each_entry(i
, _p
, head
, i_fat_hash
) {
208 BUG_ON(i
->vfs_inode
.i_sb
!= sb
);
209 if (i
->i_pos
!= i_pos
)
211 inode
= igrab(&i
->vfs_inode
);
215 spin_unlock(&sbi
->inode_hash_lock
);
219 static int is_exec(unsigned char *extension
)
221 unsigned char *exe_extensions
= "EXECOMBAT", *walk
;
223 for (walk
= exe_extensions
; *walk
; walk
+= 3)
224 if (!strncmp(extension
, walk
, 3))
229 static int fat_calc_dir_size(struct inode
*inode
)
231 struct msdos_sb_info
*sbi
= MSDOS_SB(inode
->i_sb
);
232 int ret
, fclus
, dclus
;
235 if (MSDOS_I(inode
)->i_start
== 0)
238 ret
= fat_get_cluster(inode
, FAT_ENT_EOF
, &fclus
, &dclus
);
241 inode
->i_size
= (fclus
+ 1) << sbi
->cluster_bits
;
246 /* doesn't deal with root inode */
247 static int fat_fill_inode(struct inode
*inode
, struct msdos_dir_entry
*de
)
249 struct msdos_sb_info
*sbi
= MSDOS_SB(inode
->i_sb
);
252 MSDOS_I(inode
)->i_pos
= 0;
253 inode
->i_uid
= sbi
->options
.fs_uid
;
254 inode
->i_gid
= sbi
->options
.fs_gid
;
256 inode
->i_generation
= get_seconds();
258 if ((de
->attr
& ATTR_DIR
) && !IS_FREE(de
->name
)) {
259 inode
->i_generation
&= ~1;
260 inode
->i_mode
= MSDOS_MKMODE(de
->attr
,
261 S_IRWXUGO
& ~sbi
->options
.fs_dmask
) | S_IFDIR
;
262 inode
->i_op
= sbi
->dir_ops
;
263 inode
->i_fop
= &fat_dir_operations
;
265 MSDOS_I(inode
)->i_start
= le16_to_cpu(de
->start
);
266 if (sbi
->fat_bits
== 32)
267 MSDOS_I(inode
)->i_start
|= (le16_to_cpu(de
->starthi
) << 16);
269 MSDOS_I(inode
)->i_logstart
= MSDOS_I(inode
)->i_start
;
270 error
= fat_calc_dir_size(inode
);
273 MSDOS_I(inode
)->mmu_private
= inode
->i_size
;
275 inode
->i_nlink
= fat_subdirs(inode
);
276 } else { /* not a directory */
277 inode
->i_generation
|= 1;
278 inode
->i_mode
= MSDOS_MKMODE(de
->attr
,
279 ((sbi
->options
.showexec
&&
281 ? S_IRUGO
|S_IWUGO
: S_IRWXUGO
)
282 & ~sbi
->options
.fs_fmask
) | S_IFREG
;
283 MSDOS_I(inode
)->i_start
= le16_to_cpu(de
->start
);
284 if (sbi
->fat_bits
== 32)
285 MSDOS_I(inode
)->i_start
|= (le16_to_cpu(de
->starthi
) << 16);
287 MSDOS_I(inode
)->i_logstart
= MSDOS_I(inode
)->i_start
;
288 inode
->i_size
= le32_to_cpu(de
->size
);
289 inode
->i_op
= &fat_file_inode_operations
;
290 inode
->i_fop
= &fat_file_operations
;
291 inode
->i_mapping
->a_ops
= &fat_aops
;
292 MSDOS_I(inode
)->mmu_private
= inode
->i_size
;
294 if (de
->attr
& ATTR_SYS
) {
295 if (sbi
->options
.sys_immutable
)
296 inode
->i_flags
|= S_IMMUTABLE
;
298 MSDOS_I(inode
)->i_attrs
= de
->attr
& ATTR_UNUSED
;
299 /* this is as close to the truth as we can get ... */
300 inode
->i_blksize
= sbi
->cluster_size
;
301 inode
->i_blocks
= ((inode
->i_size
+ (sbi
->cluster_size
- 1))
302 & ~((loff_t
)sbi
->cluster_size
- 1)) >> 9;
303 inode
->i_mtime
.tv_sec
=
304 date_dos2unix(le16_to_cpu(de
->time
), le16_to_cpu(de
->date
));
305 inode
->i_mtime
.tv_nsec
= 0;
306 if (sbi
->options
.isvfat
) {
307 int secs
= de
->ctime_cs
/ 100;
308 int csecs
= de
->ctime_cs
% 100;
309 inode
->i_ctime
.tv_sec
=
310 date_dos2unix(le16_to_cpu(de
->ctime
),
311 le16_to_cpu(de
->cdate
)) + secs
;
312 inode
->i_ctime
.tv_nsec
= csecs
* 10000000;
313 inode
->i_atime
.tv_sec
=
314 date_dos2unix(le16_to_cpu(0), le16_to_cpu(de
->adate
));
315 inode
->i_atime
.tv_nsec
= 0;
317 inode
->i_ctime
= inode
->i_atime
= inode
->i_mtime
;
322 struct inode
*fat_build_inode(struct super_block
*sb
,
323 struct msdos_dir_entry
*de
, loff_t i_pos
)
328 inode
= fat_iget(sb
, i_pos
);
331 inode
= new_inode(sb
);
333 inode
= ERR_PTR(-ENOMEM
);
336 inode
->i_ino
= iunique(sb
, MSDOS_ROOT_INO
);
337 inode
->i_version
= 1;
338 err
= fat_fill_inode(inode
, de
);
341 inode
= ERR_PTR(err
);
344 fat_attach(inode
, i_pos
);
345 insert_inode_hash(inode
);
350 EXPORT_SYMBOL(fat_build_inode
);
352 static void fat_delete_inode(struct inode
*inode
)
354 truncate_inode_pages(&inode
->i_data
, 0);
356 if (!is_bad_inode(inode
)) {
363 static void fat_clear_inode(struct inode
*inode
)
365 struct msdos_sb_info
*sbi
= MSDOS_SB(inode
->i_sb
);
367 if (is_bad_inode(inode
))
370 spin_lock(&sbi
->inode_hash_lock
);
371 fat_cache_inval_inode(inode
);
372 hlist_del_init(&MSDOS_I(inode
)->i_fat_hash
);
373 spin_unlock(&sbi
->inode_hash_lock
);
377 static void fat_put_super(struct super_block
*sb
)
379 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
381 if (!(sb
->s_flags
& MS_RDONLY
))
382 fat_clusters_flush(sb
);
385 unload_nls(sbi
->nls_disk
);
386 sbi
->nls_disk
= NULL
;
387 sbi
->options
.codepage
= fat_default_codepage
;
390 unload_nls(sbi
->nls_io
);
393 if (sbi
->options
.iocharset
!= fat_default_iocharset
) {
394 kfree(sbi
->options
.iocharset
);
395 sbi
->options
.iocharset
= fat_default_iocharset
;
398 sb
->s_fs_info
= NULL
;
402 static kmem_cache_t
*fat_inode_cachep
;
404 static struct inode
*fat_alloc_inode(struct super_block
*sb
)
406 struct msdos_inode_info
*ei
;
407 ei
= kmem_cache_alloc(fat_inode_cachep
, SLAB_KERNEL
);
410 return &ei
->vfs_inode
;
413 static void fat_destroy_inode(struct inode
*inode
)
415 kmem_cache_free(fat_inode_cachep
, MSDOS_I(inode
));
418 static void init_once(void * foo
, kmem_cache_t
* cachep
, unsigned long flags
)
420 struct msdos_inode_info
*ei
= (struct msdos_inode_info
*)foo
;
422 if ((flags
& (SLAB_CTOR_VERIFY
|SLAB_CTOR_CONSTRUCTOR
)) ==
423 SLAB_CTOR_CONSTRUCTOR
) {
424 spin_lock_init(&ei
->cache_lru_lock
);
426 ei
->cache_valid_id
= FAT_CACHE_VALID
+ 1;
427 INIT_LIST_HEAD(&ei
->cache_lru
);
428 INIT_HLIST_NODE(&ei
->i_fat_hash
);
429 inode_init_once(&ei
->vfs_inode
);
433 static int __init
fat_init_inodecache(void)
435 fat_inode_cachep
= kmem_cache_create("fat_inode_cache",
436 sizeof(struct msdos_inode_info
),
437 0, SLAB_RECLAIM_ACCOUNT
,
439 if (fat_inode_cachep
== NULL
)
444 static void __exit
fat_destroy_inodecache(void)
446 if (kmem_cache_destroy(fat_inode_cachep
))
447 printk(KERN_INFO
"fat_inode_cache: not all structures were freed\n");
450 static int fat_remount(struct super_block
*sb
, int *flags
, char *data
)
452 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
453 *flags
|= MS_NODIRATIME
| (sbi
->options
.isvfat
? 0 : MS_NOATIME
);
457 static int fat_statfs(struct super_block
*sb
, struct kstatfs
*buf
)
459 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
461 /* If the count of free cluster is still unknown, counts it here. */
462 if (sbi
->free_clusters
== -1) {
463 int err
= fat_count_free_clusters(sb
);
468 buf
->f_type
= sb
->s_magic
;
469 buf
->f_bsize
= sbi
->cluster_size
;
470 buf
->f_blocks
= sbi
->max_cluster
- FAT_START_ENT
;
471 buf
->f_bfree
= sbi
->free_clusters
;
472 buf
->f_bavail
= sbi
->free_clusters
;
473 buf
->f_namelen
= sbi
->options
.isvfat
? 260 : 12;
478 static int fat_write_inode(struct inode
*inode
, int wait
)
480 struct super_block
*sb
= inode
->i_sb
;
481 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
482 struct buffer_head
*bh
;
483 struct msdos_dir_entry
*raw_entry
;
488 i_pos
= MSDOS_I(inode
)->i_pos
;
489 if (inode
->i_ino
== MSDOS_ROOT_INO
|| !i_pos
)
493 bh
= sb_bread(sb
, i_pos
>> sbi
->dir_per_block_bits
);
495 printk(KERN_ERR
"FAT: unable to read inode block "
496 "for updating (i_pos %lld)\n", i_pos
);
500 spin_lock(&sbi
->inode_hash_lock
);
501 if (i_pos
!= MSDOS_I(inode
)->i_pos
) {
502 spin_unlock(&sbi
->inode_hash_lock
);
508 raw_entry
= &((struct msdos_dir_entry
*) (bh
->b_data
))
509 [i_pos
& (sbi
->dir_per_block
- 1)];
510 if (S_ISDIR(inode
->i_mode
))
513 raw_entry
->size
= cpu_to_le32(inode
->i_size
);
514 raw_entry
->attr
= fat_attr(inode
);
515 raw_entry
->start
= cpu_to_le16(MSDOS_I(inode
)->i_logstart
);
516 raw_entry
->starthi
= cpu_to_le16(MSDOS_I(inode
)->i_logstart
>> 16);
517 fat_date_unix2dos(inode
->i_mtime
.tv_sec
, &raw_entry
->time
, &raw_entry
->date
);
518 if (sbi
->options
.isvfat
) {
520 fat_date_unix2dos(inode
->i_ctime
.tv_sec
,&raw_entry
->ctime
,&raw_entry
->cdate
);
521 fat_date_unix2dos(inode
->i_atime
.tv_sec
,&atime
,&raw_entry
->adate
);
522 raw_entry
->ctime_cs
= (inode
->i_ctime
.tv_sec
& 1) * 100 +
523 inode
->i_ctime
.tv_nsec
/ 10000000;
525 spin_unlock(&sbi
->inode_hash_lock
);
526 mark_buffer_dirty(bh
);
528 err
= sync_dirty_buffer(bh
);
535 int fat_sync_inode(struct inode
*inode
)
537 return fat_write_inode(inode
, 1);
540 EXPORT_SYMBOL(fat_sync_inode
);
542 static int fat_show_options(struct seq_file
*m
, struct vfsmount
*mnt
);
543 static struct super_operations fat_sops
= {
544 .alloc_inode
= fat_alloc_inode
,
545 .destroy_inode
= fat_destroy_inode
,
546 .write_inode
= fat_write_inode
,
547 .delete_inode
= fat_delete_inode
,
548 .put_super
= fat_put_super
,
549 .statfs
= fat_statfs
,
550 .clear_inode
= fat_clear_inode
,
551 .remount_fs
= fat_remount
,
553 .read_inode
= make_bad_inode
,
555 .show_options
= fat_show_options
,
559 * a FAT file handle with fhtype 3 is
560 * 0/ i_ino - for fast, reliable lookup if still in the cache
561 * 1/ i_generation - to see if i_ino is still valid
562 * bit 0 == 0 iff directory
563 * 2/ i_pos(8-39) - if ino has changed, but still in cache
564 * 3/ i_pos(4-7)|i_logstart - to semi-verify inode found at i_pos
565 * 4/ i_pos(0-3)|parent->i_logstart - maybe used to hunt for the file on disc
567 * Hack for NFSv2: Maximum FAT entry number is 28bits and maximum
568 * i_pos is 40bits (blocknr(32) + dir offset(8)), so two 4bits
569 * of i_logstart is used to store the directory entry offset.
572 static struct dentry
*
573 fat_decode_fh(struct super_block
*sb
, __u32
*fh
, int len
, int fhtype
,
574 int (*acceptable
)(void *context
, struct dentry
*de
),
578 return ERR_PTR(-ESTALE
);
580 return ERR_PTR(-ESTALE
);
582 return sb
->s_export_op
->find_exported_dentry(sb
, fh
, NULL
, acceptable
, context
);
585 static struct dentry
*fat_get_dentry(struct super_block
*sb
, void *inump
)
587 struct inode
*inode
= NULL
;
588 struct dentry
*result
;
591 inode
= iget(sb
, fh
[0]);
592 if (!inode
|| is_bad_inode(inode
) || inode
->i_generation
!= fh
[1]) {
599 int i_logstart
= fh
[3] & 0x0fffffff;
601 i_pos
= (loff_t
)fh
[2] << 8;
602 i_pos
|= ((fh
[3] >> 24) & 0xf0) | (fh
[4] >> 28);
604 /* try 2 - see if i_pos is in F-d-c
605 * require i_logstart to be the same
606 * Will fail if you truncate and then re-write
609 inode
= fat_iget(sb
, i_pos
);
610 if (inode
&& MSDOS_I(inode
)->i_logstart
!= i_logstart
) {
616 /* For now, do nothing
617 * What we could do is:
618 * follow the file starting at fh[4], and record
619 * the ".." entry, and the name of the fh[2] entry.
620 * The follow the ".." file finding the next step up.
621 * This way we build a path to the root of
622 * the tree. If this works, we lookup the path and so
623 * get this inode into the cache.
624 * Finally try the fat_iget lookup again
625 * If that fails, then weare totally out of luck
626 * But all that is for another day
630 return ERR_PTR(-ESTALE
);
633 /* now to find a dentry.
634 * If possible, get a well-connected one
636 result
= d_alloc_anon(inode
);
637 if (result
== NULL
) {
639 return ERR_PTR(-ENOMEM
);
641 result
->d_op
= sb
->s_root
->d_op
;
646 fat_encode_fh(struct dentry
*de
, __u32
*fh
, int *lenp
, int connectable
)
649 struct inode
*inode
= de
->d_inode
;
650 u32 ipos_h
, ipos_m
, ipos_l
;
653 return 255; /* no room */
655 ipos_h
= MSDOS_I(inode
)->i_pos
>> 8;
656 ipos_m
= (MSDOS_I(inode
)->i_pos
& 0xf0) << 24;
657 ipos_l
= (MSDOS_I(inode
)->i_pos
& 0x0f) << 28;
659 fh
[0] = inode
->i_ino
;
660 fh
[1] = inode
->i_generation
;
662 fh
[3] = ipos_m
| MSDOS_I(inode
)->i_logstart
;
663 spin_lock(&de
->d_lock
);
664 fh
[4] = ipos_l
| MSDOS_I(de
->d_parent
->d_inode
)->i_logstart
;
665 spin_unlock(&de
->d_lock
);
669 static struct dentry
*fat_get_parent(struct dentry
*child
)
671 struct buffer_head
*bh
;
672 struct msdos_dir_entry
*de
;
674 struct dentry
*parent
;
680 err
= fat_get_dotdot_entry(child
->d_inode
, &bh
, &de
, &i_pos
);
682 parent
= ERR_PTR(err
);
685 inode
= fat_build_inode(child
->d_sb
, de
, i_pos
);
688 parent
= ERR_PTR(PTR_ERR(inode
));
691 parent
= d_alloc_anon(inode
);
694 parent
= ERR_PTR(-ENOMEM
);
702 static struct export_operations fat_export_ops
= {
703 .decode_fh
= fat_decode_fh
,
704 .encode_fh
= fat_encode_fh
,
705 .get_dentry
= fat_get_dentry
,
706 .get_parent
= fat_get_parent
,
709 static int fat_show_options(struct seq_file
*m
, struct vfsmount
*mnt
)
711 struct msdos_sb_info
*sbi
= MSDOS_SB(mnt
->mnt_sb
);
712 struct fat_mount_options
*opts
= &sbi
->options
;
713 int isvfat
= opts
->isvfat
;
715 if (opts
->fs_uid
!= 0)
716 seq_printf(m
, ",uid=%u", opts
->fs_uid
);
717 if (opts
->fs_gid
!= 0)
718 seq_printf(m
, ",gid=%u", opts
->fs_gid
);
719 seq_printf(m
, ",fmask=%04o", opts
->fs_fmask
);
720 seq_printf(m
, ",dmask=%04o", opts
->fs_dmask
);
722 seq_printf(m
, ",codepage=%s", sbi
->nls_disk
->charset
);
725 seq_printf(m
, ",iocharset=%s", sbi
->nls_io
->charset
);
727 switch (opts
->shortname
) {
728 case VFAT_SFN_DISPLAY_WIN95
| VFAT_SFN_CREATE_WIN95
:
729 seq_puts(m
, ",shortname=win95");
731 case VFAT_SFN_DISPLAY_WINNT
| VFAT_SFN_CREATE_WINNT
:
732 seq_puts(m
, ",shortname=winnt");
734 case VFAT_SFN_DISPLAY_WINNT
| VFAT_SFN_CREATE_WIN95
:
735 seq_puts(m
, ",shortname=mixed");
737 case VFAT_SFN_DISPLAY_LOWER
| VFAT_SFN_CREATE_WIN95
:
738 /* seq_puts(m, ",shortname=lower"); */
741 seq_puts(m
, ",shortname=unknown");
745 if (opts
->name_check
!= 'n')
746 seq_printf(m
, ",check=%c", opts
->name_check
);
748 seq_puts(m
, ",quiet");
750 seq_puts(m
, ",showexec");
751 if (opts
->sys_immutable
)
752 seq_puts(m
, ",sys_immutable");
755 seq_puts(m
, ",dotsOK=yes");
757 seq_puts(m
, ",nocase");
760 seq_puts(m
, ",utf8");
761 if (opts
->unicode_xlate
)
762 seq_puts(m
, ",uni_xlate");
764 seq_puts(m
, ",nonumtail");
771 Opt_check_n
, Opt_check_r
, Opt_check_s
, Opt_uid
, Opt_gid
,
772 Opt_umask
, Opt_dmask
, Opt_fmask
, Opt_codepage
, Opt_nocase
,
773 Opt_quiet
, Opt_showexec
, Opt_debug
, Opt_immutable
,
774 Opt_dots
, Opt_nodots
,
775 Opt_charset
, Opt_shortname_lower
, Opt_shortname_win95
,
776 Opt_shortname_winnt
, Opt_shortname_mixed
, Opt_utf8_no
, Opt_utf8_yes
,
777 Opt_uni_xl_no
, Opt_uni_xl_yes
, Opt_nonumtail_no
, Opt_nonumtail_yes
,
778 Opt_obsolate
, Opt_err
,
781 static match_table_t fat_tokens
= {
782 {Opt_check_r
, "check=relaxed"},
783 {Opt_check_s
, "check=strict"},
784 {Opt_check_n
, "check=normal"},
785 {Opt_check_r
, "check=r"},
786 {Opt_check_s
, "check=s"},
787 {Opt_check_n
, "check=n"},
790 {Opt_umask
, "umask=%o"},
791 {Opt_dmask
, "dmask=%o"},
792 {Opt_fmask
, "fmask=%o"},
793 {Opt_codepage
, "codepage=%u"},
794 {Opt_nocase
, "nocase"},
795 {Opt_quiet
, "quiet"},
796 {Opt_showexec
, "showexec"},
797 {Opt_debug
, "debug"},
798 {Opt_immutable
, "sys_immutable"},
799 {Opt_obsolate
, "conv=binary"},
800 {Opt_obsolate
, "conv=text"},
801 {Opt_obsolate
, "conv=auto"},
802 {Opt_obsolate
, "conv=b"},
803 {Opt_obsolate
, "conv=t"},
804 {Opt_obsolate
, "conv=a"},
805 {Opt_obsolate
, "fat=%u"},
806 {Opt_obsolate
, "blocksize=%u"},
807 {Opt_obsolate
, "cvf_format=%20s"},
808 {Opt_obsolate
, "cvf_options=%100s"},
809 {Opt_obsolate
, "posix"},
812 static match_table_t msdos_tokens
= {
813 {Opt_nodots
, "nodots"},
814 {Opt_nodots
, "dotsOK=no"},
816 {Opt_dots
, "dotsOK=yes"},
819 static match_table_t vfat_tokens
= {
820 {Opt_charset
, "iocharset=%s"},
821 {Opt_shortname_lower
, "shortname=lower"},
822 {Opt_shortname_win95
, "shortname=win95"},
823 {Opt_shortname_winnt
, "shortname=winnt"},
824 {Opt_shortname_mixed
, "shortname=mixed"},
825 {Opt_utf8_no
, "utf8=0"}, /* 0 or no or false */
826 {Opt_utf8_no
, "utf8=no"},
827 {Opt_utf8_no
, "utf8=false"},
828 {Opt_utf8_yes
, "utf8=1"}, /* empty or 1 or yes or true */
829 {Opt_utf8_yes
, "utf8=yes"},
830 {Opt_utf8_yes
, "utf8=true"},
831 {Opt_utf8_yes
, "utf8"},
832 {Opt_uni_xl_no
, "uni_xlate=0"}, /* 0 or no or false */
833 {Opt_uni_xl_no
, "uni_xlate=no"},
834 {Opt_uni_xl_no
, "uni_xlate=false"},
835 {Opt_uni_xl_yes
, "uni_xlate=1"}, /* empty or 1 or yes or true */
836 {Opt_uni_xl_yes
, "uni_xlate=yes"},
837 {Opt_uni_xl_yes
, "uni_xlate=true"},
838 {Opt_uni_xl_yes
, "uni_xlate"},
839 {Opt_nonumtail_no
, "nonumtail=0"}, /* 0 or no or false */
840 {Opt_nonumtail_no
, "nonumtail=no"},
841 {Opt_nonumtail_no
, "nonumtail=false"},
842 {Opt_nonumtail_yes
, "nonumtail=1"}, /* empty or 1 or yes or true */
843 {Opt_nonumtail_yes
, "nonumtail=yes"},
844 {Opt_nonumtail_yes
, "nonumtail=true"},
845 {Opt_nonumtail_yes
, "nonumtail"},
849 static int parse_options(char *options
, int is_vfat
, int silent
, int *debug
,
850 struct fat_mount_options
*opts
)
853 substring_t args
[MAX_OPT_ARGS
];
857 opts
->isvfat
= is_vfat
;
859 opts
->fs_uid
= current
->uid
;
860 opts
->fs_gid
= current
->gid
;
861 opts
->fs_fmask
= opts
->fs_dmask
= current
->fs
->umask
;
862 opts
->codepage
= fat_default_codepage
;
863 opts
->iocharset
= fat_default_iocharset
;
865 opts
->shortname
= VFAT_SFN_DISPLAY_LOWER
|VFAT_SFN_CREATE_WIN95
;
868 opts
->name_check
= 'n';
869 opts
->quiet
= opts
->showexec
= opts
->sys_immutable
= opts
->dotsOK
= 0;
870 opts
->utf8
= opts
->unicode_xlate
= 0;
878 while ((p
= strsep(&options
, ",")) != NULL
) {
883 token
= match_token(p
, fat_tokens
, args
);
884 if (token
== Opt_err
) {
886 token
= match_token(p
, vfat_tokens
, args
);
888 token
= match_token(p
, msdos_tokens
, args
);
892 opts
->name_check
= 's';
895 opts
->name_check
= 'r';
898 opts
->name_check
= 'n';
904 /* for backward compatibility */
905 opts
->shortname
= VFAT_SFN_DISPLAY_WIN95
906 | VFAT_SFN_CREATE_WIN95
;
919 opts
->sys_immutable
= 1;
922 if (match_int(&args
[0], &option
))
924 opts
->fs_uid
= option
;
927 if (match_int(&args
[0], &option
))
929 opts
->fs_gid
= option
;
932 if (match_octal(&args
[0], &option
))
934 opts
->fs_fmask
= opts
->fs_dmask
= option
;
937 if (match_octal(&args
[0], &option
))
939 opts
->fs_dmask
= option
;
942 if (match_octal(&args
[0], &option
))
944 opts
->fs_fmask
= option
;
947 if (match_int(&args
[0], &option
))
949 opts
->codepage
= option
;
962 if (opts
->iocharset
!= fat_default_iocharset
)
963 kfree(opts
->iocharset
);
964 iocharset
= match_strdup(&args
[0]);
967 opts
->iocharset
= iocharset
;
969 case Opt_shortname_lower
:
970 opts
->shortname
= VFAT_SFN_DISPLAY_LOWER
971 | VFAT_SFN_CREATE_WIN95
;
973 case Opt_shortname_win95
:
974 opts
->shortname
= VFAT_SFN_DISPLAY_WIN95
975 | VFAT_SFN_CREATE_WIN95
;
977 case Opt_shortname_winnt
:
978 opts
->shortname
= VFAT_SFN_DISPLAY_WINNT
979 | VFAT_SFN_CREATE_WINNT
;
981 case Opt_shortname_mixed
:
982 opts
->shortname
= VFAT_SFN_DISPLAY_WINNT
983 | VFAT_SFN_CREATE_WIN95
;
985 case Opt_utf8_no
: /* 0 or no or false */
988 case Opt_utf8_yes
: /* empty or 1 or yes or true */
991 case Opt_uni_xl_no
: /* 0 or no or false */
992 opts
->unicode_xlate
= 0;
994 case Opt_uni_xl_yes
: /* empty or 1 or yes or true */
995 opts
->unicode_xlate
= 1;
997 case Opt_nonumtail_no
: /* 0 or no or false */
998 opts
->numtail
= 1; /* negated option */
1000 case Opt_nonumtail_yes
: /* empty or 1 or yes or true */
1001 opts
->numtail
= 0; /* negated option */
1004 /* obsolete mount options */
1006 printk(KERN_INFO
"FAT: \"%s\" option is obsolete, "
1007 "not supported now\n", p
);
1009 /* unknown option */
1013 "FAT: Unrecognized mount option \"%s\" "
1014 "or missing value\n", p
);
1019 /* UTF8 doesn't provide FAT semantics */
1020 if (!strcmp(opts
->iocharset
, "utf8")) {
1021 printk(KERN_ERR
"FAT: utf8 is not a recommended IO charset"
1022 " for FAT filesystems, filesystem will be case sensitive!\n");
1025 if (opts
->unicode_xlate
)
1031 static int fat_read_root(struct inode
*inode
)
1033 struct super_block
*sb
= inode
->i_sb
;
1034 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
1037 MSDOS_I(inode
)->i_pos
= 0;
1038 inode
->i_uid
= sbi
->options
.fs_uid
;
1039 inode
->i_gid
= sbi
->options
.fs_gid
;
1041 inode
->i_generation
= 0;
1042 inode
->i_mode
= (S_IRWXUGO
& ~sbi
->options
.fs_dmask
) | S_IFDIR
;
1043 inode
->i_op
= sbi
->dir_ops
;
1044 inode
->i_fop
= &fat_dir_operations
;
1045 if (sbi
->fat_bits
== 32) {
1046 MSDOS_I(inode
)->i_start
= sbi
->root_cluster
;
1047 error
= fat_calc_dir_size(inode
);
1051 MSDOS_I(inode
)->i_start
= 0;
1052 inode
->i_size
= sbi
->dir_entries
* sizeof(struct msdos_dir_entry
);
1054 inode
->i_blksize
= sbi
->cluster_size
;
1055 inode
->i_blocks
= ((inode
->i_size
+ (sbi
->cluster_size
- 1))
1056 & ~((loff_t
)sbi
->cluster_size
- 1)) >> 9;
1057 MSDOS_I(inode
)->i_logstart
= 0;
1058 MSDOS_I(inode
)->mmu_private
= inode
->i_size
;
1060 MSDOS_I(inode
)->i_attrs
= ATTR_NONE
;
1061 inode
->i_mtime
.tv_sec
= inode
->i_atime
.tv_sec
= inode
->i_ctime
.tv_sec
= 0;
1062 inode
->i_mtime
.tv_nsec
= inode
->i_atime
.tv_nsec
= inode
->i_ctime
.tv_nsec
= 0;
1063 inode
->i_nlink
= fat_subdirs(inode
)+2;
1069 * Read the super block of an MS-DOS FS.
1071 int fat_fill_super(struct super_block
*sb
, void *data
, int silent
,
1072 struct inode_operations
*fs_dir_inode_ops
, int isvfat
)
1074 struct inode
*root_inode
= NULL
;
1075 struct buffer_head
*bh
;
1076 struct fat_boot_sector
*b
;
1077 struct msdos_sb_info
*sbi
;
1078 u16 logical_sector_size
;
1079 u32 total_sectors
, total_clusters
, fat_clusters
, rootdir_sectors
;
1085 sbi
= kmalloc(sizeof(struct msdos_sb_info
), GFP_KERNEL
);
1088 sb
->s_fs_info
= sbi
;
1089 memset(sbi
, 0, sizeof(struct msdos_sb_info
));
1091 sb
->s_flags
|= MS_NODIRATIME
;
1092 sb
->s_magic
= MSDOS_SUPER_MAGIC
;
1093 sb
->s_op
= &fat_sops
;
1094 sb
->s_export_op
= &fat_export_ops
;
1095 sbi
->dir_ops
= fs_dir_inode_ops
;
1097 error
= parse_options(data
, isvfat
, silent
, &debug
, &sbi
->options
);
1102 sb_min_blocksize(sb
, 512);
1103 bh
= sb_bread(sb
, 0);
1105 printk(KERN_ERR
"FAT: unable to read boot sector\n");
1109 b
= (struct fat_boot_sector
*) bh
->b_data
;
1112 printk(KERN_ERR
"FAT: bogus number of reserved sectors\n");
1118 printk(KERN_ERR
"FAT: bogus number of FAT structure\n");
1124 * Earlier we checked here that b->secs_track and b->head are nonzero,
1125 * but it turns out valid FAT filesystems can have zero there.
1129 if (!FAT_VALID_MEDIA(media
)) {
1131 printk(KERN_ERR
"FAT: invalid media value (0x%02x)\n",
1136 logical_sector_size
=
1137 le16_to_cpu(get_unaligned((__le16
*)&b
->sector_size
));
1138 if (!logical_sector_size
1139 || (logical_sector_size
& (logical_sector_size
- 1))
1140 || (logical_sector_size
< 512)
1141 || (PAGE_CACHE_SIZE
< logical_sector_size
)) {
1143 printk(KERN_ERR
"FAT: bogus logical sector size %u\n",
1144 logical_sector_size
);
1148 sbi
->sec_per_clus
= b
->sec_per_clus
;
1149 if (!sbi
->sec_per_clus
1150 || (sbi
->sec_per_clus
& (sbi
->sec_per_clus
- 1))) {
1152 printk(KERN_ERR
"FAT: bogus sectors per cluster %u\n",
1158 if (logical_sector_size
< sb
->s_blocksize
) {
1159 printk(KERN_ERR
"FAT: logical sector size too small for device"
1160 " (logical sector size = %u)\n", logical_sector_size
);
1164 if (logical_sector_size
> sb
->s_blocksize
) {
1167 if (!sb_set_blocksize(sb
, logical_sector_size
)) {
1168 printk(KERN_ERR
"FAT: unable to set blocksize %u\n",
1169 logical_sector_size
);
1172 bh
= sb_bread(sb
, 0);
1174 printk(KERN_ERR
"FAT: unable to read boot sector"
1175 " (logical sector size = %lu)\n",
1179 b
= (struct fat_boot_sector
*) bh
->b_data
;
1182 sbi
->cluster_size
= sb
->s_blocksize
* sbi
->sec_per_clus
;
1183 sbi
->cluster_bits
= ffs(sbi
->cluster_size
) - 1;
1184 sbi
->fats
= b
->fats
;
1185 sbi
->fat_bits
= 0; /* Don't know yet */
1186 sbi
->fat_start
= le16_to_cpu(b
->reserved
);
1187 sbi
->fat_length
= le16_to_cpu(b
->fat_length
);
1188 sbi
->root_cluster
= 0;
1189 sbi
->free_clusters
= -1; /* Don't know yet */
1190 sbi
->prev_free
= FAT_START_ENT
;
1192 if (!sbi
->fat_length
&& b
->fat32_length
) {
1193 struct fat_boot_fsinfo
*fsinfo
;
1194 struct buffer_head
*fsinfo_bh
;
1198 sbi
->fat_length
= le32_to_cpu(b
->fat32_length
);
1199 sbi
->root_cluster
= le32_to_cpu(b
->root_cluster
);
1201 sb
->s_maxbytes
= 0xffffffff;
1203 /* MC - if info_sector is 0, don't multiply by 0 */
1204 sbi
->fsinfo_sector
= le16_to_cpu(b
->info_sector
);
1205 if (sbi
->fsinfo_sector
== 0)
1206 sbi
->fsinfo_sector
= 1;
1208 fsinfo_bh
= sb_bread(sb
, sbi
->fsinfo_sector
);
1209 if (fsinfo_bh
== NULL
) {
1210 printk(KERN_ERR
"FAT: bread failed, FSINFO block"
1211 " (sector = %lu)\n", sbi
->fsinfo_sector
);
1216 fsinfo
= (struct fat_boot_fsinfo
*)fsinfo_bh
->b_data
;
1217 if (!IS_FSINFO(fsinfo
)) {
1219 "FAT: Did not find valid FSINFO signature.\n"
1220 " Found signature1 0x%08x signature2 0x%08x"
1221 " (sector = %lu)\n",
1222 le32_to_cpu(fsinfo
->signature1
),
1223 le32_to_cpu(fsinfo
->signature2
),
1224 sbi
->fsinfo_sector
);
1226 sbi
->free_clusters
= le32_to_cpu(fsinfo
->free_clusters
);
1227 sbi
->prev_free
= le32_to_cpu(fsinfo
->next_cluster
);
1233 sbi
->dir_per_block
= sb
->s_blocksize
/ sizeof(struct msdos_dir_entry
);
1234 sbi
->dir_per_block_bits
= ffs(sbi
->dir_per_block
) - 1;
1236 sbi
->dir_start
= sbi
->fat_start
+ sbi
->fats
* sbi
->fat_length
;
1238 le16_to_cpu(get_unaligned((__le16
*)&b
->dir_entries
));
1239 if (sbi
->dir_entries
& (sbi
->dir_per_block
- 1)) {
1241 printk(KERN_ERR
"FAT: bogus directroy-entries per block"
1242 " (%u)\n", sbi
->dir_entries
);
1247 rootdir_sectors
= sbi
->dir_entries
1248 * sizeof(struct msdos_dir_entry
) / sb
->s_blocksize
;
1249 sbi
->data_start
= sbi
->dir_start
+ rootdir_sectors
;
1250 total_sectors
= le16_to_cpu(get_unaligned((__le16
*)&b
->sectors
));
1251 if (total_sectors
== 0)
1252 total_sectors
= le32_to_cpu(b
->total_sect
);
1254 total_clusters
= (total_sectors
- sbi
->data_start
) / sbi
->sec_per_clus
;
1256 if (sbi
->fat_bits
!= 32)
1257 sbi
->fat_bits
= (total_clusters
> MAX_FAT12
) ? 16 : 12;
1259 /* check that FAT table does not overflow */
1260 fat_clusters
= sbi
->fat_length
* sb
->s_blocksize
* 8 / sbi
->fat_bits
;
1261 total_clusters
= min(total_clusters
, fat_clusters
- FAT_START_ENT
);
1262 if (total_clusters
> MAX_FAT(sb
)) {
1264 printk(KERN_ERR
"FAT: count of clusters too big (%u)\n",
1270 sbi
->max_cluster
= total_clusters
+ FAT_START_ENT
;
1271 /* check the free_clusters, it's not necessarily correct */
1272 if (sbi
->free_clusters
!= -1 && sbi
->free_clusters
> total_clusters
)
1273 sbi
->free_clusters
= -1;
1274 /* check the prev_free, it's not necessarily correct */
1275 sbi
->prev_free
%= sbi
->max_cluster
;
1276 if (sbi
->prev_free
< FAT_START_ENT
)
1277 sbi
->prev_free
= FAT_START_ENT
;
1281 /* set up enough so that it can read an inode */
1283 fat_ent_access_init(sb
);
1286 * The low byte of FAT's first entry must have same value with
1287 * media-field. But in real world, too many devices is
1288 * writing wrong value. So, removed that validity check.
1290 * if (FAT_FIRST_ENT(sb, media) != first)
1294 sprintf(buf
, "cp%d", sbi
->options
.codepage
);
1295 sbi
->nls_disk
= load_nls(buf
);
1296 if (!sbi
->nls_disk
) {
1297 printk(KERN_ERR
"FAT: codepage %s not found\n", buf
);
1301 /* FIXME: utf8 is using iocharset for upper/lower conversion */
1302 if (sbi
->options
.isvfat
) {
1303 sbi
->nls_io
= load_nls(sbi
->options
.iocharset
);
1305 printk(KERN_ERR
"FAT: IO charset %s not found\n",
1306 sbi
->options
.iocharset
);
1312 root_inode
= new_inode(sb
);
1315 root_inode
->i_ino
= MSDOS_ROOT_INO
;
1316 root_inode
->i_version
= 1;
1317 error
= fat_read_root(root_inode
);
1321 insert_inode_hash(root_inode
);
1322 sb
->s_root
= d_alloc_root(root_inode
);
1324 printk(KERN_ERR
"FAT: get root inode failed\n");
1333 printk(KERN_INFO
"VFS: Can't find a valid FAT filesystem"
1334 " on dev %s.\n", sb
->s_id
);
1340 unload_nls(sbi
->nls_io
);
1342 unload_nls(sbi
->nls_disk
);
1343 if (sbi
->options
.iocharset
!= fat_default_iocharset
)
1344 kfree(sbi
->options
.iocharset
);
1345 sb
->s_fs_info
= NULL
;
1350 EXPORT_SYMBOL(fat_fill_super
);
1352 int __init
fat_cache_init(void);
1353 void fat_cache_destroy(void);
1355 static int __init
init_fat_fs(void)
1359 err
= fat_cache_init();
1363 err
= fat_init_inodecache();
1370 fat_cache_destroy();
1374 static void __exit
exit_fat_fs(void)
1376 fat_cache_destroy();
1377 fat_destroy_inodecache();
1380 module_init(init_fat_fs
)
1381 module_exit(exit_fat_fs
)
1383 MODULE_LICENSE("GPL");