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/seq_file.h>
18 #include <linux/pagemap.h>
19 #include <linux/mpage.h>
20 #include <linux/buffer_head.h>
21 #include <linux/mount.h>
22 #include <linux/aio.h>
23 #include <linux/vfs.h>
24 #include <linux/parser.h>
25 #include <linux/uio.h>
26 #include <linux/writeback.h>
27 #include <linux/log2.h>
28 #include <linux/hash.h>
29 #include <linux/blkdev.h>
30 #include <asm/unaligned.h>
33 #ifndef CONFIG_FAT_DEFAULT_IOCHARSET
34 /* if user don't select VFAT, this is undefined. */
35 #define CONFIG_FAT_DEFAULT_IOCHARSET ""
38 static int fat_default_codepage
= CONFIG_FAT_DEFAULT_CODEPAGE
;
39 static char fat_default_iocharset
[] = CONFIG_FAT_DEFAULT_IOCHARSET
;
42 static int fat_add_cluster(struct inode
*inode
)
46 err
= fat_alloc_clusters(inode
, &cluster
, 1);
49 /* FIXME: this cluster should be added after data of this
50 * cluster is writed */
51 err
= fat_chain_add(inode
, cluster
, 1);
53 fat_free_clusters(inode
, cluster
);
57 static inline int __fat_get_block(struct inode
*inode
, sector_t iblock
,
58 unsigned long *max_blocks
,
59 struct buffer_head
*bh_result
, int create
)
61 struct super_block
*sb
= inode
->i_sb
;
62 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
63 unsigned long mapped_blocks
;
67 err
= fat_bmap(inode
, iblock
, &phys
, &mapped_blocks
, create
);
71 map_bh(bh_result
, sb
, phys
);
72 *max_blocks
= min(mapped_blocks
, *max_blocks
);
78 if (iblock
!= MSDOS_I(inode
)->mmu_private
>> sb
->s_blocksize_bits
) {
79 fat_fs_error(sb
, "corrupted file size (i_pos %lld, %lld)",
80 MSDOS_I(inode
)->i_pos
, MSDOS_I(inode
)->mmu_private
);
84 offset
= (unsigned long)iblock
& (sbi
->sec_per_clus
- 1);
86 /* TODO: multiple cluster allocation would be desirable. */
87 err
= fat_add_cluster(inode
);
91 /* available blocks on this cluster */
92 mapped_blocks
= sbi
->sec_per_clus
- offset
;
94 *max_blocks
= min(mapped_blocks
, *max_blocks
);
95 MSDOS_I(inode
)->mmu_private
+= *max_blocks
<< sb
->s_blocksize_bits
;
97 err
= fat_bmap(inode
, iblock
, &phys
, &mapped_blocks
, create
);
102 BUG_ON(*max_blocks
!= mapped_blocks
);
103 set_buffer_new(bh_result
);
104 map_bh(bh_result
, sb
, phys
);
109 static int fat_get_block(struct inode
*inode
, sector_t iblock
,
110 struct buffer_head
*bh_result
, int create
)
112 struct super_block
*sb
= inode
->i_sb
;
113 unsigned long max_blocks
= bh_result
->b_size
>> inode
->i_blkbits
;
116 err
= __fat_get_block(inode
, iblock
, &max_blocks
, bh_result
, create
);
119 bh_result
->b_size
= max_blocks
<< sb
->s_blocksize_bits
;
123 static int fat_writepage(struct page
*page
, struct writeback_control
*wbc
)
125 return block_write_full_page(page
, fat_get_block
, wbc
);
128 static int fat_writepages(struct address_space
*mapping
,
129 struct writeback_control
*wbc
)
131 return mpage_writepages(mapping
, wbc
, fat_get_block
);
134 static int fat_readpage(struct file
*file
, struct page
*page
)
136 return mpage_readpage(page
, fat_get_block
);
139 static int fat_readpages(struct file
*file
, struct address_space
*mapping
,
140 struct list_head
*pages
, unsigned nr_pages
)
142 return mpage_readpages(mapping
, pages
, nr_pages
, fat_get_block
);
145 static void fat_write_failed(struct address_space
*mapping
, loff_t to
)
147 struct inode
*inode
= mapping
->host
;
149 if (to
> inode
->i_size
) {
150 truncate_pagecache(inode
, to
, inode
->i_size
);
151 fat_truncate_blocks(inode
, inode
->i_size
);
155 static int fat_write_begin(struct file
*file
, struct address_space
*mapping
,
156 loff_t pos
, unsigned len
, unsigned flags
,
157 struct page
**pagep
, void **fsdata
)
160 #if defined(FEATURE_STORAGE_PID_LOGGER)
161 extern unsigned char *page_logger
;
162 struct page_pid_logger
*tmp_logger
;
163 unsigned long page_index
;
164 extern spinlock_t g_locker
;
165 unsigned long g_flags
;
169 err
= cont_write_begin(file
, mapping
, pos
, len
, flags
,
170 pagep
, fsdata
, fat_get_block
,
171 &MSDOS_I(mapping
->host
)->mmu_private
);
172 #if defined(FEATURE_STORAGE_PID_LOGGER)
173 if( page_logger
&& (*pagep
)) {
174 //printk(KERN_INFO"fat write_begin hank logger count:%d init %x currentpid:%d page:%x mem_map:%x pfn:%d page->index:%d\n", num_physpages, page_logger, current->pid, *pagep, mem_map, (unsigned)((*pagep) - mem_map), (*pagep)->index);
175 //printk(KERN_INFO"page_logger_lock:%x %d", page_logger_lock, ((num_physpages+(1<<PAGE_LOCKER_SHIFT)-1)>>PAGE_LOCKER_SHIFT));
176 //#if defined(CONFIG_FLATMEM)
177 //page_index = (unsigned long)((*pagep) - mem_map) ;
179 page_index
= (unsigned long)(__page_to_pfn(*pagep
))- PHYS_PFN_OFFSET
;
181 tmp_logger
=((struct page_pid_logger
*)page_logger
) + page_index
;
182 spin_lock_irqsave(&g_locker
, g_flags
);
183 if( page_index
< num_physpages
) {
184 if( tmp_logger
->pid1
== 0XFFFF)
185 tmp_logger
->pid1
= current
->pid
;
186 else if( tmp_logger
->pid1
!= current
->pid
)
187 tmp_logger
->pid2
= current
->pid
;
189 spin_unlock_irqrestore(&g_locker
, g_flags
);
190 //printk(KERN_INFO"tmp logger pid1:%u pid2:%u pfn:%d page:%x pos:%x host:%x max_mapnr:%x\n", tmp_logger->pid1, tmp_logger->pid2, (unsigned long)((*pagep) - mem_map),(*pagep), pos, mapping->host, max_mapnr );
191 //printk(KERN_INFO"tmp logger pid1:%u pid2:%u pfn:%lu page:%p\n", tmp_logger->pid1, tmp_logger->pid2, (unsigned long)(__page_to_pfn(*pagep)),(*pagep));
195 fat_write_failed(mapping
, pos
+ len
);
199 static int fat_write_end(struct file
*file
, struct address_space
*mapping
,
200 loff_t pos
, unsigned len
, unsigned copied
,
201 struct page
*pagep
, void *fsdata
)
203 struct inode
*inode
= mapping
->host
;
205 err
= generic_write_end(file
, mapping
, pos
, len
, copied
, pagep
, fsdata
);
207 fat_write_failed(mapping
, pos
+ len
);
208 if (!(err
< 0) && !(MSDOS_I(inode
)->i_attrs
& ATTR_ARCH
)) {
209 inode
->i_mtime
= inode
->i_ctime
= CURRENT_TIME_SEC
;
210 MSDOS_I(inode
)->i_attrs
|= ATTR_ARCH
;
211 mark_inode_dirty(inode
);
216 static ssize_t
fat_direct_IO(int rw
, struct kiocb
*iocb
,
217 const struct iovec
*iov
,
218 loff_t offset
, unsigned long nr_segs
)
220 struct file
*file
= iocb
->ki_filp
;
221 struct address_space
*mapping
= file
->f_mapping
;
222 struct inode
*inode
= mapping
->host
;
227 * FIXME: blockdev_direct_IO() doesn't use ->write_begin(),
228 * so we need to update the ->mmu_private to block boundary.
230 * But we must fill the remaining area or hole by nul for
231 * updating ->mmu_private.
233 * Return 0, and fallback to normal buffered write.
235 loff_t size
= offset
+ iov_length(iov
, nr_segs
);
236 if (MSDOS_I(inode
)->mmu_private
< size
)
241 * FAT need to use the DIO_LOCKING for avoiding the race
242 * condition of fat_get_block() and ->truncate().
244 ret
= blockdev_direct_IO(rw
, iocb
, inode
, iov
, offset
, nr_segs
,
246 if (ret
< 0 && (rw
& WRITE
))
247 fat_write_failed(mapping
, offset
+ iov_length(iov
, nr_segs
));
252 static sector_t
_fat_bmap(struct address_space
*mapping
, sector_t block
)
256 /* fat_get_cluster() assumes the requested blocknr isn't truncated. */
257 down_read(&MSDOS_I(mapping
->host
)->truncate_lock
);
258 blocknr
= generic_block_bmap(mapping
, block
, fat_get_block
);
259 up_read(&MSDOS_I(mapping
->host
)->truncate_lock
);
264 static const struct address_space_operations fat_aops
= {
265 .readpage
= fat_readpage
,
266 .readpages
= fat_readpages
,
267 .writepage
= fat_writepage
,
268 .writepages
= fat_writepages
,
269 .write_begin
= fat_write_begin
,
270 .write_end
= fat_write_end
,
271 .direct_IO
= fat_direct_IO
,
276 * New FAT inode stuff. We do the following:
277 * a) i_ino is constant and has nothing with on-disk location.
278 * b) FAT manages its own cache of directory entries.
279 * c) *This* cache is indexed by on-disk location.
280 * d) inode has an associated directory entry, all right, but
281 * it may be unhashed.
282 * e) currently entries are stored within struct inode. That should
284 * f) we deal with races in the following way:
285 * 1. readdir() and lookup() do FAT-dir-cache lookup.
286 * 2. rename() unhashes the F-d-c entry and rehashes it in
288 * 3. unlink() and rmdir() unhash F-d-c entry.
289 * 4. fat_write_inode() checks whether the thing is unhashed.
290 * If it is we silently return. If it isn't we do bread(),
291 * check if the location is still valid and retry if it
292 * isn't. Otherwise we do changes.
293 * 5. Spinlock is used to protect hash/unhash/location check/lookup
294 * 6. fat_evict_inode() unhashes the F-d-c entry.
295 * 7. lookup() and readdir() do igrab() if they find a F-d-c entry
296 * and consider negative result as cache miss.
299 static void fat_hash_init(struct super_block
*sb
)
301 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
304 spin_lock_init(&sbi
->inode_hash_lock
);
305 for (i
= 0; i
< FAT_HASH_SIZE
; i
++)
306 INIT_HLIST_HEAD(&sbi
->inode_hashtable
[i
]);
309 static inline unsigned long fat_hash(loff_t i_pos
)
311 return hash_32(i_pos
, FAT_HASH_BITS
);
314 static void dir_hash_init(struct super_block
*sb
)
316 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
319 spin_lock_init(&sbi
->dir_hash_lock
);
320 for (i
= 0; i
< FAT_HASH_SIZE
; i
++)
321 INIT_HLIST_HEAD(&sbi
->dir_hashtable
[i
]);
324 void fat_attach(struct inode
*inode
, loff_t i_pos
)
326 struct msdos_sb_info
*sbi
= MSDOS_SB(inode
->i_sb
);
328 if (inode
->i_ino
!= MSDOS_ROOT_INO
) {
329 struct hlist_head
*head
= sbi
->inode_hashtable
332 spin_lock(&sbi
->inode_hash_lock
);
333 MSDOS_I(inode
)->i_pos
= i_pos
;
334 hlist_add_head(&MSDOS_I(inode
)->i_fat_hash
, head
);
335 spin_unlock(&sbi
->inode_hash_lock
);
338 /* If NFS support is enabled, cache the mapping of start cluster
339 * to directory inode. This is used during reconnection of
340 * dentries to the filesystem root.
342 if (S_ISDIR(inode
->i_mode
) && sbi
->options
.nfs
) {
343 struct hlist_head
*d_head
= sbi
->dir_hashtable
;
344 d_head
+= fat_dir_hash(MSDOS_I(inode
)->i_logstart
);
346 spin_lock(&sbi
->dir_hash_lock
);
347 hlist_add_head(&MSDOS_I(inode
)->i_dir_hash
, d_head
);
348 spin_unlock(&sbi
->dir_hash_lock
);
351 EXPORT_SYMBOL_GPL(fat_attach
);
353 void fat_detach(struct inode
*inode
)
355 struct msdos_sb_info
*sbi
= MSDOS_SB(inode
->i_sb
);
356 spin_lock(&sbi
->inode_hash_lock
);
357 MSDOS_I(inode
)->i_pos
= 0;
358 hlist_del_init(&MSDOS_I(inode
)->i_fat_hash
);
359 spin_unlock(&sbi
->inode_hash_lock
);
361 if (S_ISDIR(inode
->i_mode
) && sbi
->options
.nfs
) {
362 spin_lock(&sbi
->dir_hash_lock
);
363 hlist_del_init(&MSDOS_I(inode
)->i_dir_hash
);
364 spin_unlock(&sbi
->dir_hash_lock
);
367 EXPORT_SYMBOL_GPL(fat_detach
);
369 struct inode
*fat_iget(struct super_block
*sb
, loff_t i_pos
)
371 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
372 struct hlist_head
*head
= sbi
->inode_hashtable
+ fat_hash(i_pos
);
373 struct msdos_inode_info
*i
;
374 struct inode
*inode
= NULL
;
376 spin_lock(&sbi
->inode_hash_lock
);
377 hlist_for_each_entry(i
, head
, i_fat_hash
) {
378 BUG_ON(i
->vfs_inode
.i_sb
!= sb
);
379 if (i
->i_pos
!= i_pos
)
381 inode
= igrab(&i
->vfs_inode
);
385 spin_unlock(&sbi
->inode_hash_lock
);
389 static int is_exec(unsigned char *extension
)
391 unsigned char *exe_extensions
= "EXECOMBAT", *walk
;
393 for (walk
= exe_extensions
; *walk
; walk
+= 3)
394 if (!strncmp(extension
, walk
, 3))
399 static int fat_calc_dir_size(struct inode
*inode
)
401 struct msdos_sb_info
*sbi
= MSDOS_SB(inode
->i_sb
);
402 int ret
, fclus
, dclus
;
405 if (MSDOS_I(inode
)->i_start
== 0)
408 ret
= fat_get_cluster(inode
, FAT_ENT_EOF
, &fclus
, &dclus
);
411 inode
->i_size
= (fclus
+ 1) << sbi
->cluster_bits
;
416 /* doesn't deal with root inode */
417 int fat_fill_inode(struct inode
*inode
, struct msdos_dir_entry
*de
)
419 struct msdos_sb_info
*sbi
= MSDOS_SB(inode
->i_sb
);
422 MSDOS_I(inode
)->i_pos
= 0;
423 inode
->i_uid
= sbi
->options
.fs_uid
;
424 inode
->i_gid
= sbi
->options
.fs_gid
;
426 inode
->i_generation
= get_seconds();
428 if ((de
->attr
& ATTR_DIR
) && !IS_FREE(de
->name
)) {
429 inode
->i_generation
&= ~1;
430 inode
->i_mode
= fat_make_mode(sbi
, de
->attr
, S_IRWXUGO
);
431 inode
->i_op
= sbi
->dir_ops
;
432 inode
->i_fop
= &fat_dir_operations
;
434 MSDOS_I(inode
)->i_start
= fat_get_start(sbi
, de
);
435 MSDOS_I(inode
)->i_logstart
= MSDOS_I(inode
)->i_start
;
436 error
= fat_calc_dir_size(inode
);
439 MSDOS_I(inode
)->mmu_private
= inode
->i_size
;
441 set_nlink(inode
, fat_subdirs(inode
));
442 } else { /* not a directory */
443 inode
->i_generation
|= 1;
444 inode
->i_mode
= fat_make_mode(sbi
, de
->attr
,
445 ((sbi
->options
.showexec
&& !is_exec(de
->name
+ 8))
446 ? S_IRUGO
|S_IWUGO
: S_IRWXUGO
));
447 MSDOS_I(inode
)->i_start
= fat_get_start(sbi
, de
);
449 MSDOS_I(inode
)->i_logstart
= MSDOS_I(inode
)->i_start
;
450 inode
->i_size
= le32_to_cpu(de
->size
);
451 inode
->i_op
= &fat_file_inode_operations
;
452 inode
->i_fop
= &fat_file_operations
;
453 inode
->i_mapping
->a_ops
= &fat_aops
;
454 MSDOS_I(inode
)->mmu_private
= inode
->i_size
;
456 if (de
->attr
& ATTR_SYS
) {
457 if (sbi
->options
.sys_immutable
)
458 inode
->i_flags
|= S_IMMUTABLE
;
460 fat_save_attrs(inode
, de
->attr
);
462 inode
->i_blocks
= ((inode
->i_size
+ (sbi
->cluster_size
- 1))
463 & ~((loff_t
)sbi
->cluster_size
- 1)) >> 9;
465 fat_time_fat2unix(sbi
, &inode
->i_mtime
, de
->time
, de
->date
, 0);
466 if (sbi
->options
.isvfat
) {
467 fat_time_fat2unix(sbi
, &inode
->i_ctime
, de
->ctime
,
468 de
->cdate
, de
->ctime_cs
);
469 fat_time_fat2unix(sbi
, &inode
->i_atime
, 0, de
->adate
, 0);
471 inode
->i_ctime
= inode
->i_atime
= inode
->i_mtime
;
476 static inline void fat_lock_build_inode(struct msdos_sb_info
*sbi
)
478 if (sbi
->options
.nfs
== FAT_NFS_NOSTALE_RO
)
479 mutex_lock(&sbi
->nfs_build_inode_lock
);
482 static inline void fat_unlock_build_inode(struct msdos_sb_info
*sbi
)
484 if (sbi
->options
.nfs
== FAT_NFS_NOSTALE_RO
)
485 mutex_unlock(&sbi
->nfs_build_inode_lock
);
488 struct inode
*fat_build_inode(struct super_block
*sb
,
489 struct msdos_dir_entry
*de
, loff_t i_pos
)
494 fat_lock_build_inode(MSDOS_SB(sb
));
495 inode
= fat_iget(sb
, i_pos
);
498 inode
= new_inode(sb
);
500 inode
= ERR_PTR(-ENOMEM
);
503 inode
->i_ino
= iunique(sb
, MSDOS_ROOT_INO
);
504 inode
->i_version
= 1;
505 err
= fat_fill_inode(inode
, de
);
508 inode
= ERR_PTR(err
);
511 fat_attach(inode
, i_pos
);
512 insert_inode_hash(inode
);
514 fat_unlock_build_inode(MSDOS_SB(sb
));
518 EXPORT_SYMBOL_GPL(fat_build_inode
);
520 static void fat_evict_inode(struct inode
*inode
)
522 truncate_inode_pages(&inode
->i_data
, 0);
523 if (!inode
->i_nlink
) {
525 fat_truncate_blocks(inode
, 0);
527 invalidate_inode_buffers(inode
);
529 fat_cache_inval_inode(inode
);
533 static void fat_set_state(struct super_block
*sb
,
534 unsigned int set
, unsigned int force
)
536 struct buffer_head
*bh
;
537 struct fat_boot_sector
*b
;
538 struct msdos_sb_info
*sbi
= sb
->s_fs_info
;
540 /* do not change any thing if mounted read only */
541 if ((sb
->s_flags
& MS_RDONLY
) && !force
)
544 /* do not change state if fs was dirty */
546 /* warn only on set (mount). */
548 fat_msg(sb
, KERN_WARNING
, "Volume was not properly "
549 "unmounted. Some data may be corrupt. "
554 bh
= sb_bread(sb
, 0);
556 fat_msg(sb
, KERN_ERR
, "unable to read boot sector "
557 "to mark fs as dirty");
561 b
= (struct fat_boot_sector
*) bh
->b_data
;
563 if (sbi
->fat_bits
== 32) {
565 b
->fat32
.state
|= FAT_STATE_DIRTY
;
567 b
->fat32
.state
&= ~FAT_STATE_DIRTY
;
568 } else /* fat 16 and 12 */ {
570 b
->fat16
.state
|= FAT_STATE_DIRTY
;
572 b
->fat16
.state
&= ~FAT_STATE_DIRTY
;
575 mark_buffer_dirty(bh
);
576 sync_dirty_buffer(bh
);
580 static void fat_put_super(struct super_block
*sb
)
582 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
584 fat_set_state(sb
, 0, 0);
586 iput(sbi
->fsinfo_inode
);
587 iput(sbi
->fat_inode
);
589 unload_nls(sbi
->nls_disk
);
590 unload_nls(sbi
->nls_io
);
592 if (sbi
->options
.iocharset
!= fat_default_iocharset
)
593 kfree(sbi
->options
.iocharset
);
595 sb
->s_fs_info
= NULL
;
599 static struct kmem_cache
*fat_inode_cachep
;
601 static struct inode
*fat_alloc_inode(struct super_block
*sb
)
603 struct msdos_inode_info
*ei
;
604 ei
= kmem_cache_alloc(fat_inode_cachep
, GFP_NOFS
);
608 init_rwsem(&ei
->truncate_lock
);
609 return &ei
->vfs_inode
;
612 static void fat_i_callback(struct rcu_head
*head
)
614 struct inode
*inode
= container_of(head
, struct inode
, i_rcu
);
615 kmem_cache_free(fat_inode_cachep
, MSDOS_I(inode
));
618 static void fat_destroy_inode(struct inode
*inode
)
620 call_rcu(&inode
->i_rcu
, fat_i_callback
);
623 static void init_once(void *foo
)
625 struct msdos_inode_info
*ei
= (struct msdos_inode_info
*)foo
;
627 spin_lock_init(&ei
->cache_lru_lock
);
629 ei
->cache_valid_id
= FAT_CACHE_VALID
+ 1;
630 INIT_LIST_HEAD(&ei
->cache_lru
);
631 INIT_HLIST_NODE(&ei
->i_fat_hash
);
632 INIT_HLIST_NODE(&ei
->i_dir_hash
);
633 inode_init_once(&ei
->vfs_inode
);
636 static int __init
fat_init_inodecache(void)
638 fat_inode_cachep
= kmem_cache_create("fat_inode_cache",
639 sizeof(struct msdos_inode_info
),
640 0, (SLAB_RECLAIM_ACCOUNT
|
643 if (fat_inode_cachep
== NULL
)
648 static void __exit
fat_destroy_inodecache(void)
651 * Make sure all delayed rcu free inodes are flushed before we
655 kmem_cache_destroy(fat_inode_cachep
);
658 static int fat_remount(struct super_block
*sb
, int *flags
, char *data
)
661 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
662 *flags
|= MS_NODIRATIME
| (sbi
->options
.isvfat
? 0 : MS_NOATIME
);
664 /* make sure we update state on remount. */
665 new_rdonly
= *flags
& MS_RDONLY
;
666 if (new_rdonly
!= (sb
->s_flags
& MS_RDONLY
)) {
668 fat_set_state(sb
, 0, 0);
670 fat_set_state(sb
, 1, 1);
675 static int fat_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
677 struct super_block
*sb
= dentry
->d_sb
;
678 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
679 u64 id
= huge_encode_dev(sb
->s_bdev
->bd_dev
);
681 /* If the count of free cluster is still unknown, counts it here. */
682 if (sbi
->free_clusters
== -1 || !sbi
->free_clus_valid
) {
683 int err
= fat_count_free_clusters(dentry
->d_sb
);
688 buf
->f_type
= dentry
->d_sb
->s_magic
;
689 buf
->f_bsize
= sbi
->cluster_size
;
690 buf
->f_blocks
= sbi
->max_cluster
- FAT_START_ENT
;
691 buf
->f_bfree
= sbi
->free_clusters
;
692 buf
->f_bavail
= sbi
->free_clusters
;
693 buf
->f_fsid
.val
[0] = (u32
)id
;
694 buf
->f_fsid
.val
[1] = (u32
)(id
>> 32);
696 (sbi
->options
.isvfat
? FAT_LFN_LEN
: 12) * NLS_MAX_CHARSET_SIZE
;
701 static int __fat_write_inode(struct inode
*inode
, int wait
)
703 struct super_block
*sb
= inode
->i_sb
;
704 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
705 struct buffer_head
*bh
;
706 struct msdos_dir_entry
*raw_entry
;
711 if (inode
->i_ino
== MSDOS_ROOT_INO
)
715 i_pos
= fat_i_pos_read(sbi
, inode
);
719 fat_get_blknr_offset(sbi
, i_pos
, &blocknr
, &offset
);
720 bh
= sb_bread(sb
, blocknr
);
722 fat_msg(sb
, KERN_ERR
, "unable to read inode block "
723 "for updating (i_pos %lld)", i_pos
);
726 spin_lock(&sbi
->inode_hash_lock
);
727 if (i_pos
!= MSDOS_I(inode
)->i_pos
) {
728 spin_unlock(&sbi
->inode_hash_lock
);
733 raw_entry
= &((struct msdos_dir_entry
*) (bh
->b_data
))[offset
];
734 if (S_ISDIR(inode
->i_mode
))
737 raw_entry
->size
= cpu_to_le32(inode
->i_size
);
738 raw_entry
->attr
= fat_make_attrs(inode
);
739 fat_set_start(raw_entry
, MSDOS_I(inode
)->i_logstart
);
740 fat_time_unix2fat(sbi
, &inode
->i_mtime
, &raw_entry
->time
,
741 &raw_entry
->date
, NULL
);
742 if (sbi
->options
.isvfat
) {
744 fat_time_unix2fat(sbi
, &inode
->i_ctime
, &raw_entry
->ctime
,
745 &raw_entry
->cdate
, &raw_entry
->ctime_cs
);
746 fat_time_unix2fat(sbi
, &inode
->i_atime
, &atime
,
747 &raw_entry
->adate
, NULL
);
749 spin_unlock(&sbi
->inode_hash_lock
);
750 mark_buffer_dirty(bh
);
754 err
= sync_dirty_buffer(bh
);
757 #ifdef FEATURE_STORAGE_META_LOG
758 if( bh
&& bh
->b_bdev
&& bh
->b_bdev
->bd_disk
)
759 set_metadata_rw_status(bh
->b_bdev
->bd_disk
->first_minor
, NOWAIT_WRITE_CNT
);
766 static int fat_write_inode(struct inode
*inode
, struct writeback_control
*wbc
)
770 if (inode
->i_ino
== MSDOS_FSINFO_INO
) {
771 struct super_block
*sb
= inode
->i_sb
;
773 mutex_lock(&MSDOS_SB(sb
)->s_lock
);
774 err
= fat_clusters_flush(sb
);
775 mutex_unlock(&MSDOS_SB(sb
)->s_lock
);
777 err
= __fat_write_inode(inode
, wbc
->sync_mode
== WB_SYNC_ALL
);
782 int fat_sync_inode(struct inode
*inode
)
784 return __fat_write_inode(inode
, 1);
787 EXPORT_SYMBOL_GPL(fat_sync_inode
);
789 static int fat_show_options(struct seq_file
*m
, struct dentry
*root
);
790 static const struct super_operations fat_sops
= {
791 .alloc_inode
= fat_alloc_inode
,
792 .destroy_inode
= fat_destroy_inode
,
793 .write_inode
= fat_write_inode
,
794 .evict_inode
= fat_evict_inode
,
795 .put_super
= fat_put_super
,
796 .statfs
= fat_statfs
,
797 .remount_fs
= fat_remount
,
799 .show_options
= fat_show_options
,
802 static int fat_show_options(struct seq_file
*m
, struct dentry
*root
)
804 struct msdos_sb_info
*sbi
= MSDOS_SB(root
->d_sb
);
805 struct fat_mount_options
*opts
= &sbi
->options
;
806 int isvfat
= opts
->isvfat
;
808 if (!uid_eq(opts
->fs_uid
, GLOBAL_ROOT_UID
))
809 seq_printf(m
, ",uid=%u",
810 from_kuid_munged(&init_user_ns
, opts
->fs_uid
));
811 if (!gid_eq(opts
->fs_gid
, GLOBAL_ROOT_GID
))
812 seq_printf(m
, ",gid=%u",
813 from_kgid_munged(&init_user_ns
, opts
->fs_gid
));
814 seq_printf(m
, ",fmask=%04o", opts
->fs_fmask
);
815 seq_printf(m
, ",dmask=%04o", opts
->fs_dmask
);
816 if (opts
->allow_utime
)
817 seq_printf(m
, ",allow_utime=%04o", opts
->allow_utime
);
819 /* strip "cp" prefix from displayed option */
820 seq_printf(m
, ",codepage=%s", &sbi
->nls_disk
->charset
[2]);
823 seq_printf(m
, ",iocharset=%s", sbi
->nls_io
->charset
);
825 switch (opts
->shortname
) {
826 case VFAT_SFN_DISPLAY_WIN95
| VFAT_SFN_CREATE_WIN95
:
827 seq_puts(m
, ",shortname=win95");
829 case VFAT_SFN_DISPLAY_WINNT
| VFAT_SFN_CREATE_WINNT
:
830 seq_puts(m
, ",shortname=winnt");
832 case VFAT_SFN_DISPLAY_WINNT
| VFAT_SFN_CREATE_WIN95
:
833 seq_puts(m
, ",shortname=mixed");
835 case VFAT_SFN_DISPLAY_LOWER
| VFAT_SFN_CREATE_WIN95
:
836 seq_puts(m
, ",shortname=lower");
839 seq_puts(m
, ",shortname=unknown");
843 if (opts
->name_check
!= 'n')
844 seq_printf(m
, ",check=%c", opts
->name_check
);
846 seq_puts(m
, ",usefree");
848 seq_puts(m
, ",quiet");
850 seq_puts(m
, ",showexec");
851 if (opts
->sys_immutable
)
852 seq_puts(m
, ",sys_immutable");
855 seq_puts(m
, ",dotsOK=yes");
857 seq_puts(m
, ",nocase");
860 seq_puts(m
, ",utf8");
861 if (opts
->unicode_xlate
)
862 seq_puts(m
, ",uni_xlate");
864 seq_puts(m
, ",nonumtail");
866 seq_puts(m
, ",rodir");
869 seq_puts(m
, ",flush");
871 if (opts
->time_offset
)
872 seq_printf(m
, ",time_offset=%d", opts
->time_offset
);
874 seq_puts(m
, ",tz=UTC");
876 if (opts
->errors
== FAT_ERRORS_CONT
)
877 seq_puts(m
, ",errors=continue");
878 else if (opts
->errors
== FAT_ERRORS_PANIC
)
879 seq_puts(m
, ",errors=panic");
881 seq_puts(m
, ",errors=remount-ro");
882 if (opts
->nfs
== FAT_NFS_NOSTALE_RO
)
883 seq_puts(m
, ",nfs=nostale_ro");
885 seq_puts(m
, ",nfs=stale_rw");
887 seq_puts(m
, ",discard");
893 Opt_check_n
, Opt_check_r
, Opt_check_s
, Opt_uid
, Opt_gid
,
894 Opt_umask
, Opt_dmask
, Opt_fmask
, Opt_allow_utime
, Opt_codepage
,
895 Opt_usefree
, Opt_nocase
, Opt_quiet
, Opt_showexec
, Opt_debug
,
896 Opt_immutable
, Opt_dots
, Opt_nodots
,
897 Opt_charset
, Opt_shortname_lower
, Opt_shortname_win95
,
898 Opt_shortname_winnt
, Opt_shortname_mixed
, Opt_utf8_no
, Opt_utf8_yes
,
899 Opt_uni_xl_no
, Opt_uni_xl_yes
, Opt_nonumtail_no
, Opt_nonumtail_yes
,
900 Opt_obsolete
, Opt_flush
, Opt_tz_utc
, Opt_rodir
, Opt_err_cont
,
901 Opt_err_panic
, Opt_err_ro
, Opt_discard
, Opt_nfs
, Opt_time_offset
,
902 Opt_nfs_stale_rw
, Opt_nfs_nostale_ro
, Opt_err
,
905 static const match_table_t fat_tokens
= {
906 {Opt_check_r
, "check=relaxed"},
907 {Opt_check_s
, "check=strict"},
908 {Opt_check_n
, "check=normal"},
909 {Opt_check_r
, "check=r"},
910 {Opt_check_s
, "check=s"},
911 {Opt_check_n
, "check=n"},
914 {Opt_umask
, "umask=%o"},
915 {Opt_dmask
, "dmask=%o"},
916 {Opt_fmask
, "fmask=%o"},
917 {Opt_allow_utime
, "allow_utime=%o"},
918 {Opt_codepage
, "codepage=%u"},
919 {Opt_usefree
, "usefree"},
920 {Opt_nocase
, "nocase"},
921 {Opt_quiet
, "quiet"},
922 {Opt_showexec
, "showexec"},
923 {Opt_debug
, "debug"},
924 {Opt_immutable
, "sys_immutable"},
925 {Opt_flush
, "flush"},
926 {Opt_tz_utc
, "tz=UTC"},
927 {Opt_time_offset
, "time_offset=%d"},
928 {Opt_err_cont
, "errors=continue"},
929 {Opt_err_panic
, "errors=panic"},
930 {Opt_err_ro
, "errors=remount-ro"},
931 {Opt_discard
, "discard"},
932 {Opt_nfs_stale_rw
, "nfs"},
933 {Opt_nfs_stale_rw
, "nfs=stale_rw"},
934 {Opt_nfs_nostale_ro
, "nfs=nostale_ro"},
935 {Opt_obsolete
, "conv=binary"},
936 {Opt_obsolete
, "conv=text"},
937 {Opt_obsolete
, "conv=auto"},
938 {Opt_obsolete
, "conv=b"},
939 {Opt_obsolete
, "conv=t"},
940 {Opt_obsolete
, "conv=a"},
941 {Opt_obsolete
, "fat=%u"},
942 {Opt_obsolete
, "blocksize=%u"},
943 {Opt_obsolete
, "cvf_format=%20s"},
944 {Opt_obsolete
, "cvf_options=%100s"},
945 {Opt_obsolete
, "posix"},
948 static const match_table_t msdos_tokens
= {
949 {Opt_nodots
, "nodots"},
950 {Opt_nodots
, "dotsOK=no"},
952 {Opt_dots
, "dotsOK=yes"},
955 static const match_table_t vfat_tokens
= {
956 {Opt_charset
, "iocharset=%s"},
957 {Opt_shortname_lower
, "shortname=lower"},
958 {Opt_shortname_win95
, "shortname=win95"},
959 {Opt_shortname_winnt
, "shortname=winnt"},
960 {Opt_shortname_mixed
, "shortname=mixed"},
961 {Opt_utf8_no
, "utf8=0"}, /* 0 or no or false */
962 {Opt_utf8_no
, "utf8=no"},
963 {Opt_utf8_no
, "utf8=false"},
964 {Opt_utf8_yes
, "utf8=1"}, /* empty or 1 or yes or true */
965 {Opt_utf8_yes
, "utf8=yes"},
966 {Opt_utf8_yes
, "utf8=true"},
967 {Opt_utf8_yes
, "utf8"},
968 {Opt_uni_xl_no
, "uni_xlate=0"}, /* 0 or no or false */
969 {Opt_uni_xl_no
, "uni_xlate=no"},
970 {Opt_uni_xl_no
, "uni_xlate=false"},
971 {Opt_uni_xl_yes
, "uni_xlate=1"}, /* empty or 1 or yes or true */
972 {Opt_uni_xl_yes
, "uni_xlate=yes"},
973 {Opt_uni_xl_yes
, "uni_xlate=true"},
974 {Opt_uni_xl_yes
, "uni_xlate"},
975 {Opt_nonumtail_no
, "nonumtail=0"}, /* 0 or no or false */
976 {Opt_nonumtail_no
, "nonumtail=no"},
977 {Opt_nonumtail_no
, "nonumtail=false"},
978 {Opt_nonumtail_yes
, "nonumtail=1"}, /* empty or 1 or yes or true */
979 {Opt_nonumtail_yes
, "nonumtail=yes"},
980 {Opt_nonumtail_yes
, "nonumtail=true"},
981 {Opt_nonumtail_yes
, "nonumtail"},
982 {Opt_rodir
, "rodir"},
986 static int parse_options(struct super_block
*sb
, char *options
, int is_vfat
,
987 int silent
, int *debug
, struct fat_mount_options
*opts
)
990 substring_t args
[MAX_OPT_ARGS
];
994 opts
->isvfat
= is_vfat
;
996 opts
->fs_uid
= current_uid();
997 opts
->fs_gid
= current_gid();
998 opts
->fs_fmask
= opts
->fs_dmask
= current_umask();
999 opts
->allow_utime
= -1;
1000 opts
->codepage
= fat_default_codepage
;
1001 opts
->iocharset
= fat_default_iocharset
;
1003 opts
->shortname
= VFAT_SFN_DISPLAY_WINNT
|VFAT_SFN_CREATE_WIN95
;
1006 opts
->shortname
= 0;
1009 opts
->name_check
= 'n';
1010 opts
->quiet
= opts
->showexec
= opts
->sys_immutable
= opts
->dotsOK
= 0;
1011 opts
->utf8
= opts
->unicode_xlate
= 0;
1013 opts
->usefree
= opts
->nocase
= 0;
1016 opts
->errors
= FAT_ERRORS_RO
;
1022 while ((p
= strsep(&options
, ",")) != NULL
) {
1027 token
= match_token(p
, fat_tokens
, args
);
1028 if (token
== Opt_err
) {
1030 token
= match_token(p
, vfat_tokens
, args
);
1032 token
= match_token(p
, msdos_tokens
, args
);
1036 opts
->name_check
= 's';
1039 opts
->name_check
= 'r';
1042 opts
->name_check
= 'n';
1051 /* for backward compatibility */
1052 opts
->shortname
= VFAT_SFN_DISPLAY_WIN95
1053 | VFAT_SFN_CREATE_WIN95
;
1066 opts
->sys_immutable
= 1;
1069 if (match_int(&args
[0], &option
))
1071 opts
->fs_uid
= make_kuid(current_user_ns(), option
);
1072 if (!uid_valid(opts
->fs_uid
))
1076 if (match_int(&args
[0], &option
))
1078 opts
->fs_gid
= make_kgid(current_user_ns(), option
);
1079 if (!gid_valid(opts
->fs_gid
))
1083 if (match_octal(&args
[0], &option
))
1085 opts
->fs_fmask
= opts
->fs_dmask
= option
;
1088 if (match_octal(&args
[0], &option
))
1090 opts
->fs_dmask
= option
;
1093 if (match_octal(&args
[0], &option
))
1095 opts
->fs_fmask
= option
;
1097 case Opt_allow_utime
:
1098 if (match_octal(&args
[0], &option
))
1100 opts
->allow_utime
= option
& (S_IWGRP
| S_IWOTH
);
1103 if (match_int(&args
[0], &option
))
1105 opts
->codepage
= option
;
1110 case Opt_time_offset
:
1111 if (match_int(&args
[0], &option
))
1113 if (option
< -12 * 60 || option
> 12 * 60)
1116 opts
->time_offset
= option
;
1120 opts
->time_offset
= 0;
1123 opts
->errors
= FAT_ERRORS_CONT
;
1126 opts
->errors
= FAT_ERRORS_PANIC
;
1129 opts
->errors
= FAT_ERRORS_RO
;
1131 case Opt_nfs_stale_rw
:
1132 opts
->nfs
= FAT_NFS_STALE_RW
;
1134 case Opt_nfs_nostale_ro
:
1135 opts
->nfs
= FAT_NFS_NOSTALE_RO
;
1138 /* msdos specific */
1148 if (opts
->iocharset
!= fat_default_iocharset
)
1149 kfree(opts
->iocharset
);
1150 iocharset
= match_strdup(&args
[0]);
1153 opts
->iocharset
= iocharset
;
1155 case Opt_shortname_lower
:
1156 opts
->shortname
= VFAT_SFN_DISPLAY_LOWER
1157 | VFAT_SFN_CREATE_WIN95
;
1159 case Opt_shortname_win95
:
1160 opts
->shortname
= VFAT_SFN_DISPLAY_WIN95
1161 | VFAT_SFN_CREATE_WIN95
;
1163 case Opt_shortname_winnt
:
1164 opts
->shortname
= VFAT_SFN_DISPLAY_WINNT
1165 | VFAT_SFN_CREATE_WINNT
;
1167 case Opt_shortname_mixed
:
1168 opts
->shortname
= VFAT_SFN_DISPLAY_WINNT
1169 | VFAT_SFN_CREATE_WIN95
;
1171 case Opt_utf8_no
: /* 0 or no or false */
1174 case Opt_utf8_yes
: /* empty or 1 or yes or true */
1177 case Opt_uni_xl_no
: /* 0 or no or false */
1178 opts
->unicode_xlate
= 0;
1180 case Opt_uni_xl_yes
: /* empty or 1 or yes or true */
1181 opts
->unicode_xlate
= 1;
1183 case Opt_nonumtail_no
: /* 0 or no or false */
1184 opts
->numtail
= 1; /* negated option */
1186 case Opt_nonumtail_yes
: /* empty or 1 or yes or true */
1187 opts
->numtail
= 0; /* negated option */
1196 /* obsolete mount options */
1198 fat_msg(sb
, KERN_INFO
, "\"%s\" option is obsolete, "
1199 "not supported now", p
);
1201 /* unknown option */
1204 fat_msg(sb
, KERN_ERR
,
1205 "Unrecognized mount option \"%s\" "
1206 "or missing value", p
);
1213 /* UTF-8 doesn't provide FAT semantics */
1214 if (!strcmp(opts
->iocharset
, "utf8")) {
1215 fat_msg(sb
, KERN_WARNING
, "utf8 is not a recommended IO charset"
1216 " for FAT filesystems, filesystem will be "
1220 /* If user doesn't specify allow_utime, it's initialized from dmask. */
1221 if (opts
->allow_utime
== (unsigned short)-1)
1222 opts
->allow_utime
= ~opts
->fs_dmask
& (S_IWGRP
| S_IWOTH
);
1223 if (opts
->unicode_xlate
)
1225 if (opts
->nfs
== FAT_NFS_NOSTALE_RO
) {
1226 sb
->s_flags
|= MS_RDONLY
;
1227 sb
->s_export_op
= &fat_export_ops_nostale
;
1233 static void fat_dummy_inode_init(struct inode
*inode
)
1235 /* Initialize this dummy inode to work as no-op. */
1236 MSDOS_I(inode
)->mmu_private
= 0;
1237 MSDOS_I(inode
)->i_start
= 0;
1238 MSDOS_I(inode
)->i_logstart
= 0;
1239 MSDOS_I(inode
)->i_attrs
= 0;
1240 MSDOS_I(inode
)->i_pos
= 0;
1243 static int fat_read_root(struct inode
*inode
)
1245 struct super_block
*sb
= inode
->i_sb
;
1246 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
1249 MSDOS_I(inode
)->i_pos
= MSDOS_ROOT_INO
;
1250 inode
->i_uid
= sbi
->options
.fs_uid
;
1251 inode
->i_gid
= sbi
->options
.fs_gid
;
1253 inode
->i_generation
= 0;
1254 inode
->i_mode
= fat_make_mode(sbi
, ATTR_DIR
, S_IRWXUGO
);
1255 inode
->i_op
= sbi
->dir_ops
;
1256 inode
->i_fop
= &fat_dir_operations
;
1257 if (sbi
->fat_bits
== 32) {
1258 MSDOS_I(inode
)->i_start
= sbi
->root_cluster
;
1259 error
= fat_calc_dir_size(inode
);
1263 MSDOS_I(inode
)->i_start
= 0;
1264 inode
->i_size
= sbi
->dir_entries
* sizeof(struct msdos_dir_entry
);
1266 inode
->i_blocks
= ((inode
->i_size
+ (sbi
->cluster_size
- 1))
1267 & ~((loff_t
)sbi
->cluster_size
- 1)) >> 9;
1268 MSDOS_I(inode
)->i_logstart
= 0;
1269 MSDOS_I(inode
)->mmu_private
= inode
->i_size
;
1271 fat_save_attrs(inode
, ATTR_DIR
);
1272 inode
->i_mtime
.tv_sec
= inode
->i_atime
.tv_sec
= inode
->i_ctime
.tv_sec
= 0;
1273 inode
->i_mtime
.tv_nsec
= inode
->i_atime
.tv_nsec
= inode
->i_ctime
.tv_nsec
= 0;
1274 set_nlink(inode
, fat_subdirs(inode
)+2);
1279 static unsigned long calc_fat_clusters(struct super_block
*sb
)
1281 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
1283 /* Divide first to avoid overflow */
1284 if (sbi
->fat_bits
!= 12) {
1285 unsigned long ent_per_sec
= sb
->s_blocksize
* 8 / sbi
->fat_bits
;
1286 return ent_per_sec
* sbi
->fat_length
;
1289 return sbi
->fat_length
* sb
->s_blocksize
* 8 / sbi
->fat_bits
;
1293 * Read the super block of an MS-DOS FS.
1295 int fat_fill_super(struct super_block
*sb
, void *data
, int silent
, int isvfat
,
1296 void (*setup
)(struct super_block
*))
1298 struct inode
*root_inode
= NULL
, *fat_inode
= NULL
;
1299 struct inode
*fsinfo_inode
= NULL
;
1300 struct buffer_head
*bh
;
1301 struct fat_boot_sector
*b
;
1302 struct fat_boot_bsx
*bsx
;
1303 struct msdos_sb_info
*sbi
;
1304 u16 logical_sector_size
;
1305 u32 total_sectors
, total_clusters
, fat_clusters
, rootdir_sectors
;
1312 * GFP_KERNEL is ok here, because while we do hold the
1313 * supeblock lock, memory pressure can't call back into
1314 * the filesystem, since we're only just about to mount
1315 * it and have no inodes etc active!
1317 sbi
= kzalloc(sizeof(struct msdos_sb_info
), GFP_KERNEL
);
1320 sb
->s_fs_info
= sbi
;
1322 sb
->s_flags
|= MS_NODIRATIME
;
1323 sb
->s_magic
= MSDOS_SUPER_MAGIC
;
1324 sb
->s_op
= &fat_sops
;
1325 sb
->s_export_op
= &fat_export_ops
;
1326 mutex_init(&sbi
->nfs_build_inode_lock
);
1327 ratelimit_state_init(&sbi
->ratelimit
, DEFAULT_RATELIMIT_INTERVAL
,
1328 DEFAULT_RATELIMIT_BURST
);
1330 error
= parse_options(sb
, data
, isvfat
, silent
, &debug
, &sbi
->options
);
1334 setup(sb
); /* flavour-specific stuff that needs options */
1337 sb_min_blocksize(sb
, 512);
1338 bh
= sb_bread(sb
, 0);
1340 fat_msg(sb
, KERN_ERR
, "unable to read boot sector");
1344 b
= (struct fat_boot_sector
*) bh
->b_data
;
1347 fat_msg(sb
, KERN_ERR
, "bogus number of reserved sectors");
1353 fat_msg(sb
, KERN_ERR
, "bogus number of FAT structure");
1359 * Earlier we checked here that b->secs_track and b->head are nonzero,
1360 * but it turns out valid FAT filesystems can have zero there.
1364 if (!fat_valid_media(media
)) {
1366 fat_msg(sb
, KERN_ERR
, "invalid media value (0x%02x)",
1371 logical_sector_size
= get_unaligned_le16(&b
->sector_size
);
1372 if (!is_power_of_2(logical_sector_size
)
1373 || (logical_sector_size
< 512)
1374 || (logical_sector_size
> 4096)) {
1376 fat_msg(sb
, KERN_ERR
, "bogus logical sector size %u",
1377 logical_sector_size
);
1381 sbi
->sec_per_clus
= b
->sec_per_clus
;
1382 if (!is_power_of_2(sbi
->sec_per_clus
)) {
1384 fat_msg(sb
, KERN_ERR
, "bogus sectors per cluster %u",
1390 if (logical_sector_size
< sb
->s_blocksize
) {
1391 fat_msg(sb
, KERN_ERR
, "logical sector size too small for device"
1392 " (logical sector size = %u)", logical_sector_size
);
1396 if (logical_sector_size
> sb
->s_blocksize
) {
1399 if (!sb_set_blocksize(sb
, logical_sector_size
)) {
1400 fat_msg(sb
, KERN_ERR
, "unable to set blocksize %u",
1401 logical_sector_size
);
1404 bh
= sb_bread(sb
, 0);
1406 fat_msg(sb
, KERN_ERR
, "unable to read boot sector"
1407 " (logical sector size = %lu)",
1411 b
= (struct fat_boot_sector
*) bh
->b_data
;
1414 mutex_init(&sbi
->s_lock
);
1415 sbi
->cluster_size
= sb
->s_blocksize
* sbi
->sec_per_clus
;
1416 sbi
->cluster_bits
= ffs(sbi
->cluster_size
) - 1;
1417 sbi
->fats
= b
->fats
;
1418 sbi
->fat_bits
= 0; /* Don't know yet */
1419 sbi
->fat_start
= le16_to_cpu(b
->reserved
);
1420 sbi
->fat_length
= le16_to_cpu(b
->fat_length
);
1421 sbi
->root_cluster
= 0;
1422 sbi
->free_clusters
= -1; /* Don't know yet */
1423 sbi
->free_clus_valid
= 0;
1424 sbi
->prev_free
= FAT_START_ENT
;
1425 sb
->s_maxbytes
= 0xffffffff;
1427 if (!sbi
->fat_length
&& b
->fat32
.length
) {
1428 struct fat_boot_fsinfo
*fsinfo
;
1429 struct buffer_head
*fsinfo_bh
;
1433 sbi
->fat_length
= le32_to_cpu(b
->fat32
.length
);
1434 sbi
->root_cluster
= le32_to_cpu(b
->fat32
.root_cluster
);
1436 /* MC - if info_sector is 0, don't multiply by 0 */
1437 sbi
->fsinfo_sector
= le16_to_cpu(b
->fat32
.info_sector
);
1438 if (sbi
->fsinfo_sector
== 0)
1439 sbi
->fsinfo_sector
= 1;
1441 fsinfo_bh
= sb_bread(sb
, sbi
->fsinfo_sector
);
1442 if (fsinfo_bh
== NULL
) {
1443 fat_msg(sb
, KERN_ERR
, "bread failed, FSINFO block"
1444 " (sector = %lu)", sbi
->fsinfo_sector
);
1449 bsx
= (struct fat_boot_bsx
*)(bh
->b_data
+ FAT32_BSX_OFFSET
);
1451 fsinfo
= (struct fat_boot_fsinfo
*)fsinfo_bh
->b_data
;
1452 if (!IS_FSINFO(fsinfo
)) {
1453 fat_msg(sb
, KERN_WARNING
, "Invalid FSINFO signature: "
1454 "0x%08x, 0x%08x (sector = %lu)",
1455 le32_to_cpu(fsinfo
->signature1
),
1456 le32_to_cpu(fsinfo
->signature2
),
1457 sbi
->fsinfo_sector
);
1459 if (sbi
->options
.usefree
)
1460 sbi
->free_clus_valid
= 1;
1461 sbi
->free_clusters
= le32_to_cpu(fsinfo
->free_clusters
);
1462 sbi
->prev_free
= le32_to_cpu(fsinfo
->next_cluster
);
1467 bsx
= (struct fat_boot_bsx
*)(bh
->b_data
+ FAT16_BSX_OFFSET
);
1470 /* interpret volume ID as a little endian 32 bit integer */
1471 sbi
->vol_id
= (((u32
)bsx
->vol_id
[0]) | ((u32
)bsx
->vol_id
[1] << 8) |
1472 ((u32
)bsx
->vol_id
[2] << 16) | ((u32
)bsx
->vol_id
[3] << 24));
1474 sbi
->dir_per_block
= sb
->s_blocksize
/ sizeof(struct msdos_dir_entry
);
1475 sbi
->dir_per_block_bits
= ffs(sbi
->dir_per_block
) - 1;
1477 sbi
->dir_start
= sbi
->fat_start
+ sbi
->fats
* sbi
->fat_length
;
1478 sbi
->dir_entries
= get_unaligned_le16(&b
->dir_entries
);
1479 if (sbi
->dir_entries
& (sbi
->dir_per_block
- 1)) {
1481 fat_msg(sb
, KERN_ERR
, "bogus directory-entries per block"
1482 " (%u)", sbi
->dir_entries
);
1487 rootdir_sectors
= sbi
->dir_entries
1488 * sizeof(struct msdos_dir_entry
) / sb
->s_blocksize
;
1489 sbi
->data_start
= sbi
->dir_start
+ rootdir_sectors
;
1490 total_sectors
= get_unaligned_le16(&b
->sectors
);
1491 if (total_sectors
== 0)
1492 total_sectors
= le32_to_cpu(b
->total_sect
);
1494 total_clusters
= (total_sectors
- sbi
->data_start
) / sbi
->sec_per_clus
;
1496 if (sbi
->fat_bits
!= 32)
1497 sbi
->fat_bits
= (total_clusters
> MAX_FAT12
) ? 16 : 12;
1499 /* some OSes set FAT_STATE_DIRTY and clean it on unmount. */
1500 if (sbi
->fat_bits
== 32)
1501 sbi
->dirty
= b
->fat32
.state
& FAT_STATE_DIRTY
;
1502 else /* fat 16 or 12 */
1503 sbi
->dirty
= b
->fat16
.state
& FAT_STATE_DIRTY
;
1505 /* check that FAT table does not overflow */
1506 fat_clusters
= calc_fat_clusters(sb
);
1507 total_clusters
= min(total_clusters
, fat_clusters
- FAT_START_ENT
);
1508 if (total_clusters
> MAX_FAT(sb
)) {
1510 fat_msg(sb
, KERN_ERR
, "count of clusters too big (%u)",
1516 sbi
->max_cluster
= total_clusters
+ FAT_START_ENT
;
1517 /* check the free_clusters, it's not necessarily correct */
1518 if (sbi
->free_clusters
!= -1 && sbi
->free_clusters
> total_clusters
)
1519 sbi
->free_clusters
= -1;
1520 /* check the prev_free, it's not necessarily correct */
1521 sbi
->prev_free
%= sbi
->max_cluster
;
1522 if (sbi
->prev_free
< FAT_START_ENT
)
1523 sbi
->prev_free
= FAT_START_ENT
;
1527 /* set up enough so that it can read an inode */
1530 fat_ent_access_init(sb
);
1533 * The low byte of FAT's first entry must have same value with
1534 * media-field. But in real world, too many devices is
1535 * writing wrong value. So, removed that validity check.
1537 * if (FAT_FIRST_ENT(sb, media) != first)
1541 sprintf(buf
, "cp%d", sbi
->options
.codepage
);
1542 sbi
->nls_disk
= load_nls(buf
);
1543 if (!sbi
->nls_disk
) {
1544 fat_msg(sb
, KERN_ERR
, "codepage %s not found", buf
);
1548 /* FIXME: utf8 is using iocharset for upper/lower conversion */
1549 if (sbi
->options
.isvfat
) {
1550 sbi
->nls_io
= load_nls(sbi
->options
.iocharset
);
1552 fat_msg(sb
, KERN_ERR
, "IO charset %s not found",
1553 sbi
->options
.iocharset
);
1559 fat_inode
= new_inode(sb
);
1562 fat_dummy_inode_init(fat_inode
);
1563 sbi
->fat_inode
= fat_inode
;
1565 fsinfo_inode
= new_inode(sb
);
1568 fat_dummy_inode_init(fsinfo_inode
);
1569 fsinfo_inode
->i_ino
= MSDOS_FSINFO_INO
;
1570 sbi
->fsinfo_inode
= fsinfo_inode
;
1571 insert_inode_hash(fsinfo_inode
);
1573 root_inode
= new_inode(sb
);
1576 root_inode
->i_ino
= MSDOS_ROOT_INO
;
1577 root_inode
->i_version
= 1;
1578 error
= fat_read_root(root_inode
);
1584 insert_inode_hash(root_inode
);
1585 fat_attach(root_inode
, 0);
1586 sb
->s_root
= d_make_root(root_inode
);
1588 fat_msg(sb
, KERN_ERR
, "get root inode failed");
1592 if (sbi
->options
.discard
) {
1593 struct request_queue
*q
= bdev_get_queue(sb
->s_bdev
);
1594 if (!blk_queue_discard(q
))
1595 fat_msg(sb
, KERN_WARNING
,
1596 "mounting with \"discard\" option, but "
1597 "the device does not support discard");
1600 fat_set_state(sb
, 1, 0);
1606 fat_msg(sb
, KERN_INFO
, "Can't find a valid FAT filesystem");
1613 unload_nls(sbi
->nls_io
);
1614 unload_nls(sbi
->nls_disk
);
1615 if (sbi
->options
.iocharset
!= fat_default_iocharset
)
1616 kfree(sbi
->options
.iocharset
);
1617 sb
->s_fs_info
= NULL
;
1622 EXPORT_SYMBOL_GPL(fat_fill_super
);
1625 * helper function for fat_flush_inodes. This writes both the inode
1626 * and the file data blocks, waiting for in flight data blocks before
1627 * the start of the call. It does not wait for any io started
1630 static int writeback_inode(struct inode
*inode
)
1635 /* if we used wait=1, sync_inode_metadata waits for the io for the
1636 * inode to finish. So wait=0 is sent down to sync_inode_metadata
1637 * and filemap_fdatawrite is used for the data blocks
1639 ret
= sync_inode_metadata(inode
, 0);
1641 ret
= filemap_fdatawrite(inode
->i_mapping
);
1646 * write data and metadata corresponding to i1 and i2. The io is
1647 * started but we do not wait for any of it to finish.
1649 * filemap_flush is used for the block device, so if there is a dirty
1650 * page for a block already in flight, we will not wait and start the
1653 int fat_flush_inodes(struct super_block
*sb
, struct inode
*i1
, struct inode
*i2
)
1656 if (!MSDOS_SB(sb
)->options
.flush
)
1659 ret
= writeback_inode(i1
);
1661 ret
= writeback_inode(i2
);
1663 struct address_space
*mapping
= sb
->s_bdev
->bd_inode
->i_mapping
;
1664 ret
= filemap_flush(mapping
);
1668 EXPORT_SYMBOL_GPL(fat_flush_inodes
);
1670 static int __init
init_fat_fs(void)
1674 err
= fat_cache_init();
1678 err
= fat_init_inodecache();
1685 fat_cache_destroy();
1689 static void __exit
exit_fat_fs(void)
1691 fat_cache_destroy();
1692 fat_destroy_inodecache();
1695 module_init(init_fat_fs
)
1696 module_exit(exit_fat_fs
)
1698 MODULE_LICENSE("GPL");