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/vfs.h>
23 #include <linux/parser.h>
24 #include <linux/uio.h>
25 #include <linux/writeback.h>
26 #include <linux/log2.h>
27 #include <linux/hash.h>
28 #include <linux/blkdev.h>
29 #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, create);
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_error(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, create);
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 void fat_write_failed(struct address_space *mapping, loff_t to)
146 struct inode *inode = mapping->host;
148 if (to > inode->i_size) {
149 truncate_pagecache(inode, to, inode->i_size);
150 fat_truncate_blocks(inode, inode->i_size);
154 static int fat_write_begin(struct file *file, struct address_space *mapping,
155 loff_t pos, unsigned len, unsigned flags,
156 struct page **pagep, void **fsdata)
161 err = cont_write_begin(file, mapping, pos, len, flags,
162 pagep, fsdata, fat_get_block,
163 &MSDOS_I(mapping->host)->mmu_private);
165 fat_write_failed(mapping, pos + len);
169 static int fat_write_end(struct file *file, struct address_space *mapping,
170 loff_t pos, unsigned len, unsigned copied,
171 struct page *pagep, void *fsdata)
173 struct inode *inode = mapping->host;
175 err = generic_write_end(file, mapping, pos, len, copied, pagep, fsdata);
177 fat_write_failed(mapping, pos + len);
178 if (!(err < 0) && !(MSDOS_I(inode)->i_attrs & ATTR_ARCH)) {
179 inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC;
180 MSDOS_I(inode)->i_attrs |= ATTR_ARCH;
181 mark_inode_dirty(inode);
186 static ssize_t fat_direct_IO(int rw, struct kiocb *iocb,
187 const struct iovec *iov,
188 loff_t offset, unsigned long nr_segs)
190 struct file *file = iocb->ki_filp;
191 struct address_space *mapping = file->f_mapping;
192 struct inode *inode = mapping->host;
197 * FIXME: blockdev_direct_IO() doesn't use ->write_begin(),
198 * so we need to update the ->mmu_private to block boundary.
200 * But we must fill the remaining area or hole by nul for
201 * updating ->mmu_private.
203 * Return 0, and fallback to normal buffered write.
205 loff_t size = offset + iov_length(iov, nr_segs);
206 if (MSDOS_I(inode)->mmu_private < size)
211 * FAT need to use the DIO_LOCKING for avoiding the race
212 * condition of fat_get_block() and ->truncate().
214 ret = blockdev_direct_IO(rw, iocb, inode, iov, offset, nr_segs,
216 if (ret < 0 && (rw & WRITE))
217 fat_write_failed(mapping, offset + iov_length(iov, nr_segs));
222 static sector_t _fat_bmap(struct address_space *mapping, sector_t block)
226 /* fat_get_cluster() assumes the requested blocknr isn't truncated. */
227 down_read(&MSDOS_I(mapping->host)->truncate_lock);
228 blocknr = generic_block_bmap(mapping, block, fat_get_block);
229 up_read(&MSDOS_I(mapping->host)->truncate_lock);
234 static const struct address_space_operations fat_aops = {
235 .readpage = fat_readpage,
236 .readpages = fat_readpages,
237 .writepage = fat_writepage,
238 .writepages = fat_writepages,
239 .write_begin = fat_write_begin,
240 .write_end = fat_write_end,
241 .direct_IO = fat_direct_IO,
246 * New FAT inode stuff. We do the following:
247 * a) i_ino is constant and has nothing with on-disk location.
248 * b) FAT manages its own cache of directory entries.
249 * c) *This* cache is indexed by on-disk location.
250 * d) inode has an associated directory entry, all right, but
251 * it may be unhashed.
252 * e) currently entries are stored within struct inode. That should
254 * f) we deal with races in the following way:
255 * 1. readdir() and lookup() do FAT-dir-cache lookup.
256 * 2. rename() unhashes the F-d-c entry and rehashes it in
258 * 3. unlink() and rmdir() unhash F-d-c entry.
259 * 4. fat_write_inode() checks whether the thing is unhashed.
260 * If it is we silently return. If it isn't we do bread(),
261 * check if the location is still valid and retry if it
262 * isn't. Otherwise we do changes.
263 * 5. Spinlock is used to protect hash/unhash/location check/lookup
264 * 6. fat_evict_inode() unhashes the F-d-c entry.
265 * 7. lookup() and readdir() do igrab() if they find a F-d-c entry
266 * and consider negative result as cache miss.
269 static void fat_hash_init(struct super_block *sb)
271 struct msdos_sb_info *sbi = MSDOS_SB(sb);
274 spin_lock_init(&sbi->inode_hash_lock);
275 for (i = 0; i < FAT_HASH_SIZE; i++)
276 INIT_HLIST_HEAD(&sbi->inode_hashtable[i]);
279 static inline unsigned long fat_hash(loff_t i_pos)
281 return hash_32(i_pos, FAT_HASH_BITS);
284 static void dir_hash_init(struct super_block *sb)
286 struct msdos_sb_info *sbi = MSDOS_SB(sb);
289 spin_lock_init(&sbi->dir_hash_lock);
290 for (i = 0; i < FAT_HASH_SIZE; i++)
291 INIT_HLIST_HEAD(&sbi->dir_hashtable[i]);
294 void fat_attach(struct inode *inode, loff_t i_pos)
296 struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb);
298 if (inode->i_ino != MSDOS_ROOT_INO) {
299 struct hlist_head *head = sbi->inode_hashtable
302 spin_lock(&sbi->inode_hash_lock);
303 MSDOS_I(inode)->i_pos = i_pos;
304 hlist_add_head(&MSDOS_I(inode)->i_fat_hash, head);
305 spin_unlock(&sbi->inode_hash_lock);
308 /* If NFS support is enabled, cache the mapping of start cluster
309 * to directory inode. This is used during reconnection of
310 * dentries to the filesystem root.
312 if (S_ISDIR(inode->i_mode) && sbi->options.nfs) {
313 struct hlist_head *d_head = sbi->dir_hashtable;
314 d_head += fat_dir_hash(MSDOS_I(inode)->i_logstart);
316 spin_lock(&sbi->dir_hash_lock);
317 hlist_add_head(&MSDOS_I(inode)->i_dir_hash, d_head);
318 spin_unlock(&sbi->dir_hash_lock);
321 EXPORT_SYMBOL_GPL(fat_attach);
323 void fat_detach(struct inode *inode)
325 struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb);
326 spin_lock(&sbi->inode_hash_lock);
327 MSDOS_I(inode)->i_pos = 0;
328 hlist_del_init(&MSDOS_I(inode)->i_fat_hash);
329 spin_unlock(&sbi->inode_hash_lock);
331 if (S_ISDIR(inode->i_mode) && sbi->options.nfs) {
332 spin_lock(&sbi->dir_hash_lock);
333 hlist_del_init(&MSDOS_I(inode)->i_dir_hash);
334 spin_unlock(&sbi->dir_hash_lock);
337 EXPORT_SYMBOL_GPL(fat_detach);
339 struct inode *fat_iget(struct super_block *sb, loff_t i_pos)
341 struct msdos_sb_info *sbi = MSDOS_SB(sb);
342 struct hlist_head *head = sbi->inode_hashtable + fat_hash(i_pos);
343 struct msdos_inode_info *i;
344 struct inode *inode = NULL;
346 spin_lock(&sbi->inode_hash_lock);
347 hlist_for_each_entry(i, head, i_fat_hash) {
348 BUG_ON(i->vfs_inode.i_sb != sb);
349 if (i->i_pos != i_pos)
351 inode = igrab(&i->vfs_inode);
355 spin_unlock(&sbi->inode_hash_lock);
359 static int is_exec(unsigned char *extension)
361 unsigned char *exe_extensions = "EXECOMBAT", *walk;
363 for (walk = exe_extensions; *walk; walk += 3)
364 if (!strncmp(extension, walk, 3))
369 static int fat_calc_dir_size(struct inode *inode)
371 struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb);
372 int ret, fclus, dclus;
375 if (MSDOS_I(inode)->i_start == 0)
378 ret = fat_get_cluster(inode, FAT_ENT_EOF, &fclus, &dclus);
381 inode->i_size = (fclus + 1) << sbi->cluster_bits;
386 /* doesn't deal with root inode */
387 int fat_fill_inode(struct inode *inode, struct msdos_dir_entry *de)
389 struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb);
392 MSDOS_I(inode)->i_pos = 0;
393 inode->i_uid = sbi->options.fs_uid;
394 inode->i_gid = sbi->options.fs_gid;
396 inode->i_generation = get_seconds();
398 if ((de->attr & ATTR_DIR) && !IS_FREE(de->name)) {
399 inode->i_generation &= ~1;
400 inode->i_mode = fat_make_mode(sbi, de->attr, S_IRWXUGO);
401 inode->i_op = sbi->dir_ops;
402 inode->i_fop = &fat_dir_operations;
404 MSDOS_I(inode)->i_start = fat_get_start(sbi, de);
405 MSDOS_I(inode)->i_logstart = MSDOS_I(inode)->i_start;
406 error = fat_calc_dir_size(inode);
409 MSDOS_I(inode)->mmu_private = inode->i_size;
411 set_nlink(inode, fat_subdirs(inode));
412 } else { /* not a directory */
413 inode->i_generation |= 1;
414 inode->i_mode = fat_make_mode(sbi, de->attr,
415 ((sbi->options.showexec && !is_exec(de->name + 8))
416 ? S_IRUGO|S_IWUGO : S_IRWXUGO));
417 MSDOS_I(inode)->i_start = fat_get_start(sbi, de);
419 MSDOS_I(inode)->i_logstart = MSDOS_I(inode)->i_start;
420 inode->i_size = le32_to_cpu(de->size);
421 inode->i_op = &fat_file_inode_operations;
422 inode->i_fop = &fat_file_operations;
423 inode->i_mapping->a_ops = &fat_aops;
424 MSDOS_I(inode)->mmu_private = inode->i_size;
426 if (de->attr & ATTR_SYS) {
427 if (sbi->options.sys_immutable)
428 inode->i_flags |= S_IMMUTABLE;
430 fat_save_attrs(inode, de->attr);
432 inode->i_blocks = ((inode->i_size + (sbi->cluster_size - 1))
433 & ~((loff_t)sbi->cluster_size - 1)) >> 9;
435 fat_time_fat2unix(sbi, &inode->i_mtime, de->time, de->date, 0);
436 if (sbi->options.isvfat) {
437 fat_time_fat2unix(sbi, &inode->i_ctime, de->ctime,
438 de->cdate, de->ctime_cs);
439 fat_time_fat2unix(sbi, &inode->i_atime, 0, de->adate, 0);
441 inode->i_ctime = inode->i_atime = inode->i_mtime;
446 static inline void fat_lock_build_inode(struct msdos_sb_info *sbi)
448 if (sbi->options.nfs == FAT_NFS_NOSTALE_RO)
449 mutex_lock(&sbi->nfs_build_inode_lock);
452 static inline void fat_unlock_build_inode(struct msdos_sb_info *sbi)
454 if (sbi->options.nfs == FAT_NFS_NOSTALE_RO)
455 mutex_unlock(&sbi->nfs_build_inode_lock);
458 struct inode *fat_build_inode(struct super_block *sb,
459 struct msdos_dir_entry *de, loff_t i_pos)
464 fat_lock_build_inode(MSDOS_SB(sb));
465 inode = fat_iget(sb, i_pos);
468 inode = new_inode(sb);
470 inode = ERR_PTR(-ENOMEM);
473 inode->i_ino = iunique(sb, MSDOS_ROOT_INO);
474 inode->i_version = 1;
475 err = fat_fill_inode(inode, de);
478 inode = ERR_PTR(err);
481 fat_attach(inode, i_pos);
482 insert_inode_hash(inode);
484 fat_unlock_build_inode(MSDOS_SB(sb));
488 EXPORT_SYMBOL_GPL(fat_build_inode);
490 static void fat_evict_inode(struct inode *inode)
492 truncate_inode_pages(&inode->i_data, 0);
493 if (!inode->i_nlink) {
495 fat_truncate_blocks(inode, 0);
497 invalidate_inode_buffers(inode);
499 fat_cache_inval_inode(inode);
503 static void fat_set_state(struct super_block *sb,
504 unsigned int set, unsigned int force)
506 struct buffer_head *bh;
507 struct fat_boot_sector *b;
508 struct msdos_sb_info *sbi = sb->s_fs_info;
510 /* do not change any thing if mounted read only */
511 if ((sb->s_flags & MS_RDONLY) && !force)
514 /* do not change state if fs was dirty */
516 /* warn only on set (mount). */
518 fat_msg(sb, KERN_WARNING, "Volume was not properly "
519 "unmounted. Some data may be corrupt. "
524 bh = sb_bread(sb, 0);
526 fat_msg(sb, KERN_ERR, "unable to read boot sector "
527 "to mark fs as dirty");
531 b = (struct fat_boot_sector *) bh->b_data;
533 if (sbi->fat_bits == 32) {
535 b->fat32.state |= FAT_STATE_DIRTY;
537 b->fat32.state &= ~FAT_STATE_DIRTY;
538 } else /* fat 16 and 12 */ {
540 b->fat16.state |= FAT_STATE_DIRTY;
542 b->fat16.state &= ~FAT_STATE_DIRTY;
545 mark_buffer_dirty(bh);
546 sync_dirty_buffer(bh);
550 static void fat_put_super(struct super_block *sb)
552 struct msdos_sb_info *sbi = MSDOS_SB(sb);
554 fat_set_state(sb, 0, 0);
556 iput(sbi->fsinfo_inode);
557 iput(sbi->fat_inode);
559 unload_nls(sbi->nls_disk);
560 unload_nls(sbi->nls_io);
562 if (sbi->options.iocharset != fat_default_iocharset)
563 kfree(sbi->options.iocharset);
565 sb->s_fs_info = NULL;
569 static struct kmem_cache *fat_inode_cachep;
571 static struct inode *fat_alloc_inode(struct super_block *sb)
573 struct msdos_inode_info *ei;
574 ei = kmem_cache_alloc(fat_inode_cachep, GFP_NOFS);
578 init_rwsem(&ei->truncate_lock);
579 return &ei->vfs_inode;
582 static void fat_i_callback(struct rcu_head *head)
584 struct inode *inode = container_of(head, struct inode, i_rcu);
585 kmem_cache_free(fat_inode_cachep, MSDOS_I(inode));
588 static void fat_destroy_inode(struct inode *inode)
590 call_rcu(&inode->i_rcu, fat_i_callback);
593 static void init_once(void *foo)
595 struct msdos_inode_info *ei = (struct msdos_inode_info *)foo;
597 spin_lock_init(&ei->cache_lru_lock);
599 ei->cache_valid_id = FAT_CACHE_VALID + 1;
600 INIT_LIST_HEAD(&ei->cache_lru);
601 INIT_HLIST_NODE(&ei->i_fat_hash);
602 INIT_HLIST_NODE(&ei->i_dir_hash);
603 inode_init_once(&ei->vfs_inode);
606 static int __init fat_init_inodecache(void)
608 fat_inode_cachep = kmem_cache_create("fat_inode_cache",
609 sizeof(struct msdos_inode_info),
610 0, (SLAB_RECLAIM_ACCOUNT|
613 if (fat_inode_cachep == NULL)
618 static void __exit fat_destroy_inodecache(void)
621 * Make sure all delayed rcu free inodes are flushed before we
625 kmem_cache_destroy(fat_inode_cachep);
628 static int fat_remount(struct super_block *sb, int *flags, char *data)
631 struct msdos_sb_info *sbi = MSDOS_SB(sb);
632 *flags |= MS_NODIRATIME | (sbi->options.isvfat ? 0 : MS_NOATIME);
634 /* make sure we update state on remount. */
635 new_rdonly = *flags & MS_RDONLY;
636 if (new_rdonly != (sb->s_flags & MS_RDONLY)) {
638 fat_set_state(sb, 0, 0);
640 fat_set_state(sb, 1, 1);
645 static int fat_statfs(struct dentry *dentry, struct kstatfs *buf)
647 struct super_block *sb = dentry->d_sb;
648 struct msdos_sb_info *sbi = MSDOS_SB(sb);
649 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
651 /* If the count of free cluster is still unknown, counts it here. */
652 if (sbi->free_clusters == -1 || !sbi->free_clus_valid) {
653 int err = fat_count_free_clusters(dentry->d_sb);
658 buf->f_type = dentry->d_sb->s_magic;
659 buf->f_bsize = sbi->cluster_size;
660 buf->f_blocks = sbi->max_cluster - FAT_START_ENT;
661 buf->f_bfree = sbi->free_clusters;
662 buf->f_bavail = sbi->free_clusters;
663 buf->f_fsid.val[0] = (u32)id;
664 buf->f_fsid.val[1] = (u32)(id >> 32);
666 (sbi->options.isvfat ? FAT_LFN_LEN : 12) * NLS_MAX_CHARSET_SIZE;
671 static int __fat_write_inode(struct inode *inode, int wait)
673 struct super_block *sb = inode->i_sb;
674 struct msdos_sb_info *sbi = MSDOS_SB(sb);
675 struct buffer_head *bh;
676 struct msdos_dir_entry *raw_entry;
681 if (inode->i_ino == MSDOS_ROOT_INO)
685 i_pos = fat_i_pos_read(sbi, inode);
689 fat_get_blknr_offset(sbi, i_pos, &blocknr, &offset);
690 bh = sb_bread(sb, blocknr);
692 fat_msg(sb, KERN_ERR, "unable to read inode block "
693 "for updating (i_pos %lld)", i_pos);
696 spin_lock(&sbi->inode_hash_lock);
697 if (i_pos != MSDOS_I(inode)->i_pos) {
698 spin_unlock(&sbi->inode_hash_lock);
703 raw_entry = &((struct msdos_dir_entry *) (bh->b_data))[offset];
704 if (S_ISDIR(inode->i_mode))
707 raw_entry->size = cpu_to_le32(inode->i_size);
708 raw_entry->attr = fat_make_attrs(inode);
709 fat_set_start(raw_entry, MSDOS_I(inode)->i_logstart);
710 fat_time_unix2fat(sbi, &inode->i_mtime, &raw_entry->time,
711 &raw_entry->date, NULL);
712 if (sbi->options.isvfat) {
714 fat_time_unix2fat(sbi, &inode->i_ctime, &raw_entry->ctime,
715 &raw_entry->cdate, &raw_entry->ctime_cs);
716 fat_time_unix2fat(sbi, &inode->i_atime, &atime,
717 &raw_entry->adate, NULL);
719 spin_unlock(&sbi->inode_hash_lock);
720 mark_buffer_dirty(bh);
723 err = sync_dirty_buffer(bh);
728 static int fat_write_inode(struct inode *inode, struct writeback_control *wbc)
732 if (inode->i_ino == MSDOS_FSINFO_INO) {
733 struct super_block *sb = inode->i_sb;
735 mutex_lock(&MSDOS_SB(sb)->s_lock);
736 err = fat_clusters_flush(sb);
737 mutex_unlock(&MSDOS_SB(sb)->s_lock);
739 err = __fat_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
744 int fat_sync_inode(struct inode *inode)
746 return __fat_write_inode(inode, 1);
749 EXPORT_SYMBOL_GPL(fat_sync_inode);
751 static int fat_show_options(struct seq_file *m, struct dentry *root);
752 static const struct super_operations fat_sops = {
753 .alloc_inode = fat_alloc_inode,
754 .destroy_inode = fat_destroy_inode,
755 .write_inode = fat_write_inode,
756 .evict_inode = fat_evict_inode,
757 .put_super = fat_put_super,
758 .statfs = fat_statfs,
759 .remount_fs = fat_remount,
761 .show_options = fat_show_options,
764 static int fat_show_options(struct seq_file *m, struct dentry *root)
766 struct msdos_sb_info *sbi = MSDOS_SB(root->d_sb);
767 struct fat_mount_options *opts = &sbi->options;
768 int isvfat = opts->isvfat;
770 if (!uid_eq(opts->fs_uid, GLOBAL_ROOT_UID))
771 seq_printf(m, ",uid=%u",
772 from_kuid_munged(&init_user_ns, opts->fs_uid));
773 if (!gid_eq(opts->fs_gid, GLOBAL_ROOT_GID))
774 seq_printf(m, ",gid=%u",
775 from_kgid_munged(&init_user_ns, opts->fs_gid));
776 seq_printf(m, ",fmask=%04o", opts->fs_fmask);
777 seq_printf(m, ",dmask=%04o", opts->fs_dmask);
778 if (opts->allow_utime)
779 seq_printf(m, ",allow_utime=%04o", opts->allow_utime);
781 /* strip "cp" prefix from displayed option */
782 seq_printf(m, ",codepage=%s", &sbi->nls_disk->charset[2]);
785 seq_printf(m, ",iocharset=%s", sbi->nls_io->charset);
787 switch (opts->shortname) {
788 case VFAT_SFN_DISPLAY_WIN95 | VFAT_SFN_CREATE_WIN95:
789 seq_puts(m, ",shortname=win95");
791 case VFAT_SFN_DISPLAY_WINNT | VFAT_SFN_CREATE_WINNT:
792 seq_puts(m, ",shortname=winnt");
794 case VFAT_SFN_DISPLAY_WINNT | VFAT_SFN_CREATE_WIN95:
795 seq_puts(m, ",shortname=mixed");
797 case VFAT_SFN_DISPLAY_LOWER | VFAT_SFN_CREATE_WIN95:
798 seq_puts(m, ",shortname=lower");
801 seq_puts(m, ",shortname=unknown");
805 if (opts->name_check != 'n')
806 seq_printf(m, ",check=%c", opts->name_check);
808 seq_puts(m, ",usefree");
810 seq_puts(m, ",quiet");
812 seq_puts(m, ",showexec");
813 if (opts->sys_immutable)
814 seq_puts(m, ",sys_immutable");
817 seq_puts(m, ",dotsOK=yes");
819 seq_puts(m, ",nocase");
822 seq_puts(m, ",utf8");
823 if (opts->unicode_xlate)
824 seq_puts(m, ",uni_xlate");
826 seq_puts(m, ",nonumtail");
828 seq_puts(m, ",rodir");
831 seq_puts(m, ",flush");
833 if (opts->time_offset)
834 seq_printf(m, ",time_offset=%d", opts->time_offset);
836 seq_puts(m, ",tz=UTC");
838 if (opts->errors == FAT_ERRORS_CONT)
839 seq_puts(m, ",errors=continue");
840 else if (opts->errors == FAT_ERRORS_PANIC)
841 seq_puts(m, ",errors=panic");
843 seq_puts(m, ",errors=remount-ro");
844 if (opts->nfs == FAT_NFS_NOSTALE_RO)
845 seq_puts(m, ",nfs=nostale_ro");
847 seq_puts(m, ",nfs=stale_rw");
849 seq_puts(m, ",discard");
855 Opt_check_n, Opt_check_r, Opt_check_s, Opt_uid, Opt_gid,
856 Opt_umask, Opt_dmask, Opt_fmask, Opt_allow_utime, Opt_codepage,
857 Opt_usefree, Opt_nocase, Opt_quiet, Opt_showexec, Opt_debug,
858 Opt_immutable, Opt_dots, Opt_nodots,
859 Opt_charset, Opt_shortname_lower, Opt_shortname_win95,
860 Opt_shortname_winnt, Opt_shortname_mixed, Opt_utf8_no, Opt_utf8_yes,
861 Opt_uni_xl_no, Opt_uni_xl_yes, Opt_nonumtail_no, Opt_nonumtail_yes,
862 Opt_obsolete, Opt_flush, Opt_tz_utc, Opt_rodir, Opt_err_cont,
863 Opt_err_panic, Opt_err_ro, Opt_discard, Opt_nfs, Opt_time_offset,
864 Opt_nfs_stale_rw, Opt_nfs_nostale_ro, Opt_err,
867 static const match_table_t fat_tokens = {
868 {Opt_check_r, "check=relaxed"},
869 {Opt_check_s, "check=strict"},
870 {Opt_check_n, "check=normal"},
871 {Opt_check_r, "check=r"},
872 {Opt_check_s, "check=s"},
873 {Opt_check_n, "check=n"},
876 {Opt_umask, "umask=%o"},
877 {Opt_dmask, "dmask=%o"},
878 {Opt_fmask, "fmask=%o"},
879 {Opt_allow_utime, "allow_utime=%o"},
880 {Opt_codepage, "codepage=%u"},
881 {Opt_usefree, "usefree"},
882 {Opt_nocase, "nocase"},
883 {Opt_quiet, "quiet"},
884 {Opt_showexec, "showexec"},
885 {Opt_debug, "debug"},
886 {Opt_immutable, "sys_immutable"},
887 {Opt_flush, "flush"},
888 {Opt_tz_utc, "tz=UTC"},
889 {Opt_time_offset, "time_offset=%d"},
890 {Opt_err_cont, "errors=continue"},
891 {Opt_err_panic, "errors=panic"},
892 {Opt_err_ro, "errors=remount-ro"},
893 {Opt_discard, "discard"},
894 {Opt_nfs_stale_rw, "nfs"},
895 {Opt_nfs_stale_rw, "nfs=stale_rw"},
896 {Opt_nfs_nostale_ro, "nfs=nostale_ro"},
897 {Opt_obsolete, "conv=binary"},
898 {Opt_obsolete, "conv=text"},
899 {Opt_obsolete, "conv=auto"},
900 {Opt_obsolete, "conv=b"},
901 {Opt_obsolete, "conv=t"},
902 {Opt_obsolete, "conv=a"},
903 {Opt_obsolete, "fat=%u"},
904 {Opt_obsolete, "blocksize=%u"},
905 {Opt_obsolete, "cvf_format=%20s"},
906 {Opt_obsolete, "cvf_options=%100s"},
907 {Opt_obsolete, "posix"},
910 static const match_table_t msdos_tokens = {
911 {Opt_nodots, "nodots"},
912 {Opt_nodots, "dotsOK=no"},
914 {Opt_dots, "dotsOK=yes"},
917 static const match_table_t vfat_tokens = {
918 {Opt_charset, "iocharset=%s"},
919 {Opt_shortname_lower, "shortname=lower"},
920 {Opt_shortname_win95, "shortname=win95"},
921 {Opt_shortname_winnt, "shortname=winnt"},
922 {Opt_shortname_mixed, "shortname=mixed"},
923 {Opt_utf8_no, "utf8=0"}, /* 0 or no or false */
924 {Opt_utf8_no, "utf8=no"},
925 {Opt_utf8_no, "utf8=false"},
926 {Opt_utf8_yes, "utf8=1"}, /* empty or 1 or yes or true */
927 {Opt_utf8_yes, "utf8=yes"},
928 {Opt_utf8_yes, "utf8=true"},
929 {Opt_utf8_yes, "utf8"},
930 {Opt_uni_xl_no, "uni_xlate=0"}, /* 0 or no or false */
931 {Opt_uni_xl_no, "uni_xlate=no"},
932 {Opt_uni_xl_no, "uni_xlate=false"},
933 {Opt_uni_xl_yes, "uni_xlate=1"}, /* empty or 1 or yes or true */
934 {Opt_uni_xl_yes, "uni_xlate=yes"},
935 {Opt_uni_xl_yes, "uni_xlate=true"},
936 {Opt_uni_xl_yes, "uni_xlate"},
937 {Opt_nonumtail_no, "nonumtail=0"}, /* 0 or no or false */
938 {Opt_nonumtail_no, "nonumtail=no"},
939 {Opt_nonumtail_no, "nonumtail=false"},
940 {Opt_nonumtail_yes, "nonumtail=1"}, /* empty or 1 or yes or true */
941 {Opt_nonumtail_yes, "nonumtail=yes"},
942 {Opt_nonumtail_yes, "nonumtail=true"},
943 {Opt_nonumtail_yes, "nonumtail"},
944 {Opt_rodir, "rodir"},
948 static int parse_options(struct super_block *sb, char *options, int is_vfat,
949 int silent, int *debug, struct fat_mount_options *opts)
952 substring_t args[MAX_OPT_ARGS];
956 opts->isvfat = is_vfat;
958 opts->fs_uid = current_uid();
959 opts->fs_gid = current_gid();
960 opts->fs_fmask = opts->fs_dmask = current_umask();
961 opts->allow_utime = -1;
962 opts->codepage = fat_default_codepage;
963 opts->iocharset = fat_default_iocharset;
965 opts->shortname = VFAT_SFN_DISPLAY_WINNT|VFAT_SFN_CREATE_WIN95;
971 opts->name_check = 'n';
972 opts->quiet = opts->showexec = opts->sys_immutable = opts->dotsOK = 0;
973 opts->utf8 = opts->unicode_xlate = 0;
975 opts->usefree = opts->nocase = 0;
978 opts->errors = FAT_ERRORS_RO;
984 while ((p = strsep(&options, ",")) != NULL) {
989 token = match_token(p, fat_tokens, args);
990 if (token == Opt_err) {
992 token = match_token(p, vfat_tokens, args);
994 token = match_token(p, msdos_tokens, args);
998 opts->name_check = 's';
1001 opts->name_check = 'r';
1004 opts->name_check = 'n';
1013 /* for backward compatibility */
1014 opts->shortname = VFAT_SFN_DISPLAY_WIN95
1015 | VFAT_SFN_CREATE_WIN95;
1028 opts->sys_immutable = 1;
1031 if (match_int(&args[0], &option))
1033 opts->fs_uid = make_kuid(current_user_ns(), option);
1034 if (!uid_valid(opts->fs_uid))
1038 if (match_int(&args[0], &option))
1040 opts->fs_gid = make_kgid(current_user_ns(), option);
1041 if (!gid_valid(opts->fs_gid))
1045 if (match_octal(&args[0], &option))
1047 opts->fs_fmask = opts->fs_dmask = option;
1050 if (match_octal(&args[0], &option))
1052 opts->fs_dmask = option;
1055 if (match_octal(&args[0], &option))
1057 opts->fs_fmask = option;
1059 case Opt_allow_utime:
1060 if (match_octal(&args[0], &option))
1062 opts->allow_utime = option & (S_IWGRP | S_IWOTH);
1065 if (match_int(&args[0], &option))
1067 opts->codepage = option;
1072 case Opt_time_offset:
1073 if (match_int(&args[0], &option))
1075 if (option < -12 * 60 || option > 12 * 60)
1078 opts->time_offset = option;
1082 opts->time_offset = 0;
1085 opts->errors = FAT_ERRORS_CONT;
1088 opts->errors = FAT_ERRORS_PANIC;
1091 opts->errors = FAT_ERRORS_RO;
1093 case Opt_nfs_stale_rw:
1094 opts->nfs = FAT_NFS_STALE_RW;
1096 case Opt_nfs_nostale_ro:
1097 opts->nfs = FAT_NFS_NOSTALE_RO;
1100 /* msdos specific */
1110 if (opts->iocharset != fat_default_iocharset)
1111 kfree(opts->iocharset);
1112 iocharset = match_strdup(&args[0]);
1115 opts->iocharset = iocharset;
1117 case Opt_shortname_lower:
1118 opts->shortname = VFAT_SFN_DISPLAY_LOWER
1119 | VFAT_SFN_CREATE_WIN95;
1121 case Opt_shortname_win95:
1122 opts->shortname = VFAT_SFN_DISPLAY_WIN95
1123 | VFAT_SFN_CREATE_WIN95;
1125 case Opt_shortname_winnt:
1126 opts->shortname = VFAT_SFN_DISPLAY_WINNT
1127 | VFAT_SFN_CREATE_WINNT;
1129 case Opt_shortname_mixed:
1130 opts->shortname = VFAT_SFN_DISPLAY_WINNT
1131 | VFAT_SFN_CREATE_WIN95;
1133 case Opt_utf8_no: /* 0 or no or false */
1136 case Opt_utf8_yes: /* empty or 1 or yes or true */
1139 case Opt_uni_xl_no: /* 0 or no or false */
1140 opts->unicode_xlate = 0;
1142 case Opt_uni_xl_yes: /* empty or 1 or yes or true */
1143 opts->unicode_xlate = 1;
1145 case Opt_nonumtail_no: /* 0 or no or false */
1146 opts->numtail = 1; /* negated option */
1148 case Opt_nonumtail_yes: /* empty or 1 or yes or true */
1149 opts->numtail = 0; /* negated option */
1158 /* obsolete mount options */
1160 fat_msg(sb, KERN_INFO, "\"%s\" option is obsolete, "
1161 "not supported now", p);
1163 /* unknown option */
1166 fat_msg(sb, KERN_ERR,
1167 "Unrecognized mount option \"%s\" "
1168 "or missing value", p);
1175 /* UTF-8 doesn't provide FAT semantics */
1176 if (!strcmp(opts->iocharset, "utf8")) {
1177 fat_msg(sb, KERN_WARNING, "utf8 is not a recommended IO charset"
1178 " for FAT filesystems, filesystem will be "
1182 /* If user doesn't specify allow_utime, it's initialized from dmask. */
1183 if (opts->allow_utime == (unsigned short)-1)
1184 opts->allow_utime = ~opts->fs_dmask & (S_IWGRP | S_IWOTH);
1185 if (opts->unicode_xlate)
1187 if (opts->nfs == FAT_NFS_NOSTALE_RO) {
1188 sb->s_flags |= MS_RDONLY;
1189 sb->s_export_op = &fat_export_ops_nostale;
1195 static int fat_read_root(struct inode *inode)
1197 struct super_block *sb = inode->i_sb;
1198 struct msdos_sb_info *sbi = MSDOS_SB(sb);
1201 MSDOS_I(inode)->i_pos = MSDOS_ROOT_INO;
1202 inode->i_uid = sbi->options.fs_uid;
1203 inode->i_gid = sbi->options.fs_gid;
1205 inode->i_generation = 0;
1206 inode->i_mode = fat_make_mode(sbi, ATTR_DIR, S_IRWXUGO);
1207 inode->i_op = sbi->dir_ops;
1208 inode->i_fop = &fat_dir_operations;
1209 if (sbi->fat_bits == 32) {
1210 MSDOS_I(inode)->i_start = sbi->root_cluster;
1211 error = fat_calc_dir_size(inode);
1215 MSDOS_I(inode)->i_start = 0;
1216 inode->i_size = sbi->dir_entries * sizeof(struct msdos_dir_entry);
1218 inode->i_blocks = ((inode->i_size + (sbi->cluster_size - 1))
1219 & ~((loff_t)sbi->cluster_size - 1)) >> 9;
1220 MSDOS_I(inode)->i_logstart = 0;
1221 MSDOS_I(inode)->mmu_private = inode->i_size;
1223 fat_save_attrs(inode, ATTR_DIR);
1224 inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = 0;
1225 inode->i_mtime.tv_nsec = inode->i_atime.tv_nsec = inode->i_ctime.tv_nsec = 0;
1226 set_nlink(inode, fat_subdirs(inode)+2);
1232 * Read the super block of an MS-DOS FS.
1234 int fat_fill_super(struct super_block *sb, void *data, int silent, int isvfat,
1235 void (*setup)(struct super_block *))
1237 struct inode *root_inode = NULL, *fat_inode = NULL;
1238 struct inode *fsinfo_inode = NULL;
1239 struct buffer_head *bh;
1240 struct fat_boot_sector *b;
1241 struct msdos_sb_info *sbi;
1242 u16 logical_sector_size;
1243 u32 total_sectors, total_clusters, fat_clusters, rootdir_sectors;
1250 * GFP_KERNEL is ok here, because while we do hold the
1251 * supeblock lock, memory pressure can't call back into
1252 * the filesystem, since we're only just about to mount
1253 * it and have no inodes etc active!
1255 sbi = kzalloc(sizeof(struct msdos_sb_info), GFP_KERNEL);
1258 sb->s_fs_info = sbi;
1260 sb->s_flags |= MS_NODIRATIME;
1261 sb->s_magic = MSDOS_SUPER_MAGIC;
1262 sb->s_op = &fat_sops;
1263 sb->s_export_op = &fat_export_ops;
1264 mutex_init(&sbi->nfs_build_inode_lock);
1265 ratelimit_state_init(&sbi->ratelimit, DEFAULT_RATELIMIT_INTERVAL,
1266 DEFAULT_RATELIMIT_BURST);
1268 error = parse_options(sb, data, isvfat, silent, &debug, &sbi->options);
1272 setup(sb); /* flavour-specific stuff that needs options */
1275 sb_min_blocksize(sb, 512);
1276 bh = sb_bread(sb, 0);
1278 fat_msg(sb, KERN_ERR, "unable to read boot sector");
1282 b = (struct fat_boot_sector *) bh->b_data;
1285 fat_msg(sb, KERN_ERR, "bogus number of reserved sectors");
1291 fat_msg(sb, KERN_ERR, "bogus number of FAT structure");
1297 * Earlier we checked here that b->secs_track and b->head are nonzero,
1298 * but it turns out valid FAT filesystems can have zero there.
1302 if (!fat_valid_media(media)) {
1304 fat_msg(sb, KERN_ERR, "invalid media value (0x%02x)",
1309 logical_sector_size = get_unaligned_le16(&b->sector_size);
1310 if (!is_power_of_2(logical_sector_size)
1311 || (logical_sector_size < 512)
1312 || (logical_sector_size > 4096)) {
1314 fat_msg(sb, KERN_ERR, "bogus logical sector size %u",
1315 logical_sector_size);
1319 sbi->sec_per_clus = b->sec_per_clus;
1320 if (!is_power_of_2(sbi->sec_per_clus)) {
1322 fat_msg(sb, KERN_ERR, "bogus sectors per cluster %u",
1328 if (logical_sector_size < sb->s_blocksize) {
1329 fat_msg(sb, KERN_ERR, "logical sector size too small for device"
1330 " (logical sector size = %u)", logical_sector_size);
1334 if (logical_sector_size > sb->s_blocksize) {
1337 if (!sb_set_blocksize(sb, logical_sector_size)) {
1338 fat_msg(sb, KERN_ERR, "unable to set blocksize %u",
1339 logical_sector_size);
1342 bh = sb_bread(sb, 0);
1344 fat_msg(sb, KERN_ERR, "unable to read boot sector"
1345 " (logical sector size = %lu)",
1349 b = (struct fat_boot_sector *) bh->b_data;
1352 mutex_init(&sbi->s_lock);
1353 sbi->cluster_size = sb->s_blocksize * sbi->sec_per_clus;
1354 sbi->cluster_bits = ffs(sbi->cluster_size) - 1;
1355 sbi->fats = b->fats;
1356 sbi->fat_bits = 0; /* Don't know yet */
1357 sbi->fat_start = le16_to_cpu(b->reserved);
1358 sbi->fat_length = le16_to_cpu(b->fat_length);
1359 sbi->root_cluster = 0;
1360 sbi->free_clusters = -1; /* Don't know yet */
1361 sbi->free_clus_valid = 0;
1362 sbi->prev_free = FAT_START_ENT;
1363 sb->s_maxbytes = 0xffffffff;
1365 if (!sbi->fat_length && b->fat32.length) {
1366 struct fat_boot_fsinfo *fsinfo;
1367 struct buffer_head *fsinfo_bh;
1371 sbi->fat_length = le32_to_cpu(b->fat32.length);
1372 sbi->root_cluster = le32_to_cpu(b->fat32.root_cluster);
1374 /* MC - if info_sector is 0, don't multiply by 0 */
1375 sbi->fsinfo_sector = le16_to_cpu(b->fat32.info_sector);
1376 if (sbi->fsinfo_sector == 0)
1377 sbi->fsinfo_sector = 1;
1379 fsinfo_bh = sb_bread(sb, sbi->fsinfo_sector);
1380 if (fsinfo_bh == NULL) {
1381 fat_msg(sb, KERN_ERR, "bread failed, FSINFO block"
1382 " (sector = %lu)", sbi->fsinfo_sector);
1387 fsinfo = (struct fat_boot_fsinfo *)fsinfo_bh->b_data;
1388 if (!IS_FSINFO(fsinfo)) {
1389 fat_msg(sb, KERN_WARNING, "Invalid FSINFO signature: "
1390 "0x%08x, 0x%08x (sector = %lu)",
1391 le32_to_cpu(fsinfo->signature1),
1392 le32_to_cpu(fsinfo->signature2),
1393 sbi->fsinfo_sector);
1395 if (sbi->options.usefree)
1396 sbi->free_clus_valid = 1;
1397 sbi->free_clusters = le32_to_cpu(fsinfo->free_clusters);
1398 sbi->prev_free = le32_to_cpu(fsinfo->next_cluster);
1404 sbi->dir_per_block = sb->s_blocksize / sizeof(struct msdos_dir_entry);
1405 sbi->dir_per_block_bits = ffs(sbi->dir_per_block) - 1;
1407 sbi->dir_start = sbi->fat_start + sbi->fats * sbi->fat_length;
1408 sbi->dir_entries = get_unaligned_le16(&b->dir_entries);
1409 if (sbi->dir_entries & (sbi->dir_per_block - 1)) {
1411 fat_msg(sb, KERN_ERR, "bogus directory-entries per block"
1412 " (%u)", sbi->dir_entries);
1417 rootdir_sectors = sbi->dir_entries
1418 * sizeof(struct msdos_dir_entry) / sb->s_blocksize;
1419 sbi->data_start = sbi->dir_start + rootdir_sectors;
1420 total_sectors = get_unaligned_le16(&b->sectors);
1421 if (total_sectors == 0)
1422 total_sectors = le32_to_cpu(b->total_sect);
1424 total_clusters = (total_sectors - sbi->data_start) / sbi->sec_per_clus;
1426 if (sbi->fat_bits != 32)
1427 sbi->fat_bits = (total_clusters > MAX_FAT12) ? 16 : 12;
1429 /* some OSes set FAT_STATE_DIRTY and clean it on unmount. */
1430 if (sbi->fat_bits == 32)
1431 sbi->dirty = b->fat32.state & FAT_STATE_DIRTY;
1432 else /* fat 16 or 12 */
1433 sbi->dirty = b->fat16.state & FAT_STATE_DIRTY;
1435 /* check that FAT table does not overflow */
1436 fat_clusters = sbi->fat_length * sb->s_blocksize * 8 / sbi->fat_bits;
1437 total_clusters = min(total_clusters, fat_clusters - FAT_START_ENT);
1438 if (total_clusters > MAX_FAT(sb)) {
1440 fat_msg(sb, KERN_ERR, "count of clusters too big (%u)",
1446 sbi->max_cluster = total_clusters + FAT_START_ENT;
1447 /* check the free_clusters, it's not necessarily correct */
1448 if (sbi->free_clusters != -1 && sbi->free_clusters > total_clusters)
1449 sbi->free_clusters = -1;
1450 /* check the prev_free, it's not necessarily correct */
1451 sbi->prev_free %= sbi->max_cluster;
1452 if (sbi->prev_free < FAT_START_ENT)
1453 sbi->prev_free = FAT_START_ENT;
1457 /* set up enough so that it can read an inode */
1460 fat_ent_access_init(sb);
1463 * The low byte of FAT's first entry must have same value with
1464 * media-field. But in real world, too many devices is
1465 * writing wrong value. So, removed that validity check.
1467 * if (FAT_FIRST_ENT(sb, media) != first)
1471 sprintf(buf, "cp%d", sbi->options.codepage);
1472 sbi->nls_disk = load_nls(buf);
1473 if (!sbi->nls_disk) {
1474 fat_msg(sb, KERN_ERR, "codepage %s not found", buf);
1478 /* FIXME: utf8 is using iocharset for upper/lower conversion */
1479 if (sbi->options.isvfat) {
1480 sbi->nls_io = load_nls(sbi->options.iocharset);
1482 fat_msg(sb, KERN_ERR, "IO charset %s not found",
1483 sbi->options.iocharset);
1489 fat_inode = new_inode(sb);
1492 MSDOS_I(fat_inode)->i_pos = 0;
1493 sbi->fat_inode = fat_inode;
1495 fsinfo_inode = new_inode(sb);
1498 fsinfo_inode->i_ino = MSDOS_FSINFO_INO;
1499 sbi->fsinfo_inode = fsinfo_inode;
1500 insert_inode_hash(fsinfo_inode);
1502 root_inode = new_inode(sb);
1505 root_inode->i_ino = MSDOS_ROOT_INO;
1506 root_inode->i_version = 1;
1507 error = fat_read_root(root_inode);
1513 insert_inode_hash(root_inode);
1514 fat_attach(root_inode, 0);
1515 sb->s_root = d_make_root(root_inode);
1517 fat_msg(sb, KERN_ERR, "get root inode failed");
1521 if (sbi->options.discard) {
1522 struct request_queue *q = bdev_get_queue(sb->s_bdev);
1523 if (!blk_queue_discard(q))
1524 fat_msg(sb, KERN_WARNING,
1525 "mounting with \"discard\" option, but "
1526 "the device does not support discard");
1529 fat_set_state(sb, 1, 0);
1535 fat_msg(sb, KERN_INFO, "Can't find a valid FAT filesystem");
1542 unload_nls(sbi->nls_io);
1543 unload_nls(sbi->nls_disk);
1544 if (sbi->options.iocharset != fat_default_iocharset)
1545 kfree(sbi->options.iocharset);
1546 sb->s_fs_info = NULL;
1551 EXPORT_SYMBOL_GPL(fat_fill_super);
1554 * helper function for fat_flush_inodes. This writes both the inode
1555 * and the file data blocks, waiting for in flight data blocks before
1556 * the start of the call. It does not wait for any io started
1559 static int writeback_inode(struct inode *inode)
1564 /* if we used wait=1, sync_inode_metadata waits for the io for the
1565 * inode to finish. So wait=0 is sent down to sync_inode_metadata
1566 * and filemap_fdatawrite is used for the data blocks
1568 ret = sync_inode_metadata(inode, 0);
1570 ret = filemap_fdatawrite(inode->i_mapping);
1575 * write data and metadata corresponding to i1 and i2. The io is
1576 * started but we do not wait for any of it to finish.
1578 * filemap_flush is used for the block device, so if there is a dirty
1579 * page for a block already in flight, we will not wait and start the
1582 int fat_flush_inodes(struct super_block *sb, struct inode *i1, struct inode *i2)
1585 if (!MSDOS_SB(sb)->options.flush)
1588 ret = writeback_inode(i1);
1590 ret = writeback_inode(i2);
1592 struct address_space *mapping = sb->s_bdev->bd_inode->i_mapping;
1593 ret = filemap_flush(mapping);
1597 EXPORT_SYMBOL_GPL(fat_flush_inodes);
1599 static int __init init_fat_fs(void)
1603 err = fat_cache_init();
1607 err = fat_init_inodecache();
1614 fat_cache_destroy();
1618 static void __exit exit_fat_fs(void)
1620 fat_cache_destroy();
1621 fat_destroy_inodecache();
1624 module_init(init_fat_fs)
1625 module_exit(exit_fat_fs)
1627 MODULE_LICENSE("GPL");