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OGAWA Hirofumi9e975da2008-11-06 12:53:46 -08001#ifndef _FAT_H
2#define _FAT_H
3
4#include <linux/buffer_head.h>
OGAWA Hirofumi9e975da2008-11-06 12:53:46 -08005#include <linux/nls.h>
Steven J. Magnani7669e8f2012-10-04 17:14:45 -07006#include <linux/hash.h>
OGAWA Hirofumiaaa04b42010-05-24 14:33:12 -07007#include <linux/ratelimit.h>
OGAWA Hirofumi9e975da2008-11-06 12:53:46 -08008#include <linux/msdos_fs.h>
9
10/*
11 * vfat shortname flags
12 */
13#define VFAT_SFN_DISPLAY_LOWER 0x0001 /* convert to lowercase for display */
14#define VFAT_SFN_DISPLAY_WIN95 0x0002 /* emulate win95 rule for display */
15#define VFAT_SFN_DISPLAY_WINNT 0x0004 /* emulate winnt rule for display */
16#define VFAT_SFN_CREATE_WIN95 0x0100 /* emulate win95 rule for create */
17#define VFAT_SFN_CREATE_WINNT 0x0200 /* emulate winnt rule for create */
18
Denis Karpov85c78592009-06-04 02:34:22 +090019#define FAT_ERRORS_CONT 1 /* ignore error and continue */
20#define FAT_ERRORS_PANIC 2 /* panic on error */
21#define FAT_ERRORS_RO 3 /* remount r/o on error */
22
Namjae Jeon2628b7a2013-04-29 16:21:08 -070023#define FAT_NFS_STALE_RW 1 /* NFS RW support, can cause ESTALE */
24#define FAT_NFS_NOSTALE_RO 2 /* NFS RO support, no ESTALE issue */
25
OGAWA Hirofumi9e975da2008-11-06 12:53:46 -080026struct fat_mount_options {
Eric W. Biederman170782e2012-02-07 16:25:39 -080027 kuid_t fs_uid;
28 kgid_t fs_gid;
OGAWA Hirofumi9e975da2008-11-06 12:53:46 -080029 unsigned short fs_fmask;
30 unsigned short fs_dmask;
Cruz Julian Bishop4a3aeb12012-10-04 17:14:52 -070031 unsigned short codepage; /* Codepage for shortname conversions */
Jan Kara58156c82012-12-17 16:02:58 -080032 int time_offset; /* Offset of timestamps from UTC (in minutes) */
Cruz Julian Bishop4a3aeb12012-10-04 17:14:52 -070033 char *iocharset; /* Charset used for filename input/display */
34 unsigned short shortname; /* flags for shortname display/create rule */
35 unsigned char name_check; /* r = relaxed, n = normal, s = strict */
36 unsigned char errors; /* On error: continue, panic, remount-ro */
Namjae Jeon2628b7a2013-04-29 16:21:08 -070037 unsigned char nfs; /* NFS support: nostale_ro, stale_rw */
OGAWA Hirofumi9e975da2008-11-06 12:53:46 -080038 unsigned short allow_utime;/* permission for setting the [am]time */
Cruz Julian Bishop4a3aeb12012-10-04 17:14:52 -070039 unsigned quiet:1, /* set = fake successful chmods and chowns */
40 showexec:1, /* set = only set x bit for com/exe/bat */
41 sys_immutable:1, /* set = system files are immutable */
42 dotsOK:1, /* set = hidden and system files are named '.filename' */
43 isvfat:1, /* 0=no vfat long filename support, 1=vfat support */
44 utf8:1, /* Use of UTF-8 character set (Default) */
45 unicode_xlate:1, /* create escape sequences for unhandled Unicode */
46 numtail:1, /* Does first alias have a numeric '~1' type tail? */
47 flush:1, /* write things quickly */
48 nocase:1, /* Does this need case conversion? 0=need case conversion*/
49 usefree:1, /* Use free_clusters for FAT32 */
Jan Kara58156c82012-12-17 16:02:58 -080050 tz_set:1, /* Filesystem timestamps' offset set */
Cruz Julian Bishop4a3aeb12012-10-04 17:14:52 -070051 rodir:1, /* allow ATTR_RO for directory */
Conrad Meyer190a8842014-06-06 14:36:37 -070052 discard:1, /* Issue discard requests on deletions */
53 dos1xfloppy:1; /* Assume default BPB for DOS 1.x floppies */
OGAWA Hirofumi9e975da2008-11-06 12:53:46 -080054};
55
56#define FAT_HASH_BITS 8
57#define FAT_HASH_SIZE (1UL << FAT_HASH_BITS)
OGAWA Hirofumi9e975da2008-11-06 12:53:46 -080058
59/*
60 * MS-DOS file system in-core superblock data
61 */
62struct msdos_sb_info {
Cruz Julian Bishop4a3aeb12012-10-04 17:14:52 -070063 unsigned short sec_per_clus; /* sectors/cluster */
64 unsigned short cluster_bits; /* log2(cluster_size) */
65 unsigned int cluster_size; /* cluster size */
Alexander Kuleshov8de560d2015-04-16 12:47:26 -070066 unsigned char fats, fat_bits; /* number of FATs, FAT bits (12,16 or 32) */
OGAWA Hirofumi9e975da2008-11-06 12:53:46 -080067 unsigned short fat_start;
Cruz Julian Bishop4a3aeb12012-10-04 17:14:52 -070068 unsigned long fat_length; /* FAT start & length (sec.) */
OGAWA Hirofumi9e975da2008-11-06 12:53:46 -080069 unsigned long dir_start;
Cruz Julian Bishop4a3aeb12012-10-04 17:14:52 -070070 unsigned short dir_entries; /* root dir start & entries */
71 unsigned long data_start; /* first data sector */
72 unsigned long max_cluster; /* maximum cluster number */
73 unsigned long root_cluster; /* first cluster of the root directory */
74 unsigned long fsinfo_sector; /* sector number of FAT32 fsinfo */
OGAWA Hirofumi9e975da2008-11-06 12:53:46 -080075 struct mutex fat_lock;
Namjae Jeon8fceb4e2013-04-29 16:21:12 -070076 struct mutex nfs_build_inode_lock;
Marco Stornellie40b34c2012-10-06 12:40:03 +020077 struct mutex s_lock;
78 unsigned int prev_free; /* previously allocated cluster number */
79 unsigned int free_clusters; /* -1 if undefined */
OGAWA Hirofumi9e975da2008-11-06 12:53:46 -080080 unsigned int free_clus_valid; /* is free_clusters valid? */
81 struct fat_mount_options options;
Cruz Julian Bishop4a3aeb12012-10-04 17:14:52 -070082 struct nls_table *nls_disk; /* Codepage used on disk */
83 struct nls_table *nls_io; /* Charset used for input and display */
84 const void *dir_ops; /* Opaque; default directory operations */
85 int dir_per_block; /* dir entries per block */
86 int dir_per_block_bits; /* log2(dir_per_block) */
Mike Lockwood6e5b93e2013-07-08 16:00:46 -070087 unsigned int vol_id; /*volume ID*/
OGAWA Hirofumi9e975da2008-11-06 12:53:46 -080088
89 int fatent_shift;
90 struct fatent_operations *fatent_ops;
Al Virob5224122009-06-07 13:44:36 -040091 struct inode *fat_inode;
Artem Bityutskiy020ac5b2012-05-31 16:26:12 -070092 struct inode *fsinfo_inode;
OGAWA Hirofumi9e975da2008-11-06 12:53:46 -080093
OGAWA Hirofumiaaa04b42010-05-24 14:33:12 -070094 struct ratelimit_state ratelimit;
95
OGAWA Hirofumi9e975da2008-11-06 12:53:46 -080096 spinlock_t inode_hash_lock;
97 struct hlist_head inode_hashtable[FAT_HASH_SIZE];
Steven J. Magnani7669e8f2012-10-04 17:14:45 -070098
99 spinlock_t dir_hash_lock;
100 struct hlist_head dir_hashtable[FAT_HASH_SIZE];
Oleksij Rempelb88a10582013-02-27 17:03:09 -0800101
102 unsigned int dirty; /* fs state before mount */
Al Virocac45b02013-10-03 13:16:50 -0400103 struct rcu_head rcu;
OGAWA Hirofumi9e975da2008-11-06 12:53:46 -0800104};
105
106#define FAT_CACHE_VALID 0 /* special case for valid cache */
107
108/*
109 * MS-DOS file system inode data in memory
110 */
111struct msdos_inode_info {
112 spinlock_t cache_lru_lock;
113 struct list_head cache_lru;
114 int nr_caches;
115 /* for avoiding the race between fat_free() and fat_get_cluster() */
116 unsigned int cache_valid_id;
117
OGAWA Hirofumi2bdf67e2008-11-06 12:53:57 -0800118 /* NOTE: mmu_private is 64bits, so must hold ->i_mutex to access */
119 loff_t mmu_private; /* physically allocated size */
120
OGAWA Hirofumi9e975da2008-11-06 12:53:46 -0800121 int i_start; /* first cluster or 0 */
122 int i_logstart; /* logical first cluster */
123 int i_attrs; /* unused attribute bits */
124 loff_t i_pos; /* on-disk position of directory entry or 0 */
125 struct hlist_node i_fat_hash; /* hash by i_location */
Steven J. Magnani7669e8f2012-10-04 17:14:45 -0700126 struct hlist_node i_dir_hash; /* hash by i_logstart */
Christoph Hellwig58268692011-06-24 14:29:40 -0400127 struct rw_semaphore truncate_lock; /* protect bmap against truncate */
OGAWA Hirofumi9e975da2008-11-06 12:53:46 -0800128 struct inode vfs_inode;
129};
130
131struct fat_slot_info {
132 loff_t i_pos; /* on-disk position of directory entry */
133 loff_t slot_off; /* offset for slot or de start */
134 int nr_slots; /* number of slots + 1(de) in filename */
135 struct msdos_dir_entry *de;
136 struct buffer_head *bh;
137};
138
139static inline struct msdos_sb_info *MSDOS_SB(struct super_block *sb)
140{
141 return sb->s_fs_info;
142}
143
144static inline struct msdos_inode_info *MSDOS_I(struct inode *inode)
145{
146 return container_of(inode, struct msdos_inode_info, vfs_inode);
147}
148
OGAWA Hirofumi91834822008-11-06 12:53:54 -0800149/*
150 * If ->i_mode can't hold S_IWUGO (i.e. ATTR_RO), we use ->i_attrs to
151 * save ATTR_RO instead of ->i_mode.
OGAWA Hirofumidfc209c2008-11-06 12:53:55 -0800152 *
153 * If it's directory and !sbi->options.rodir, ATTR_RO isn't read-only
154 * bit, it's just used as flag for app.
OGAWA Hirofumi91834822008-11-06 12:53:54 -0800155 */
156static inline int fat_mode_can_hold_ro(struct inode *inode)
157{
158 struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb);
Al Virodacd0e72011-07-26 03:21:30 -0400159 umode_t mask;
OGAWA Hirofumi91834822008-11-06 12:53:54 -0800160
OGAWA Hirofumidfc209c2008-11-06 12:53:55 -0800161 if (S_ISDIR(inode->i_mode)) {
162 if (!sbi->options.rodir)
163 return 0;
OGAWA Hirofumi91834822008-11-06 12:53:54 -0800164 mask = ~sbi->options.fs_dmask;
OGAWA Hirofumidfc209c2008-11-06 12:53:55 -0800165 } else
OGAWA Hirofumi91834822008-11-06 12:53:54 -0800166 mask = ~sbi->options.fs_fmask;
167
168 if (!(mask & S_IWUGO))
169 return 0;
170 return 1;
171}
172
OGAWA Hirofumi9c0aa1b2008-11-06 12:53:54 -0800173/* Convert attribute bits and a mask to the UNIX mode. */
Al Virodacd0e72011-07-26 03:21:30 -0400174static inline umode_t fat_make_mode(struct msdos_sb_info *sbi,
175 u8 attrs, umode_t mode)
OGAWA Hirofumi9c0aa1b2008-11-06 12:53:54 -0800176{
OGAWA Hirofumidfc209c2008-11-06 12:53:55 -0800177 if (attrs & ATTR_RO && !((attrs & ATTR_DIR) && !sbi->options.rodir))
OGAWA Hirofumi9c0aa1b2008-11-06 12:53:54 -0800178 mode &= ~S_IWUGO;
179
180 if (attrs & ATTR_DIR)
181 return (mode & ~sbi->options.fs_dmask) | S_IFDIR;
182 else
183 return (mode & ~sbi->options.fs_fmask) | S_IFREG;
184}
185
OGAWA Hirofumi9e975da2008-11-06 12:53:46 -0800186/* Return the FAT attribute byte for this inode */
OGAWA Hirofumi9c0aa1b2008-11-06 12:53:54 -0800187static inline u8 fat_make_attrs(struct inode *inode)
OGAWA Hirofumi9e975da2008-11-06 12:53:46 -0800188{
OGAWA Hirofumi91834822008-11-06 12:53:54 -0800189 u8 attrs = MSDOS_I(inode)->i_attrs;
190 if (S_ISDIR(inode->i_mode))
191 attrs |= ATTR_DIR;
192 if (fat_mode_can_hold_ro(inode) && !(inode->i_mode & S_IWUGO))
193 attrs |= ATTR_RO;
194 return attrs;
OGAWA Hirofumi9e975da2008-11-06 12:53:46 -0800195}
196
OGAWA Hirofumi9c0aa1b2008-11-06 12:53:54 -0800197static inline void fat_save_attrs(struct inode *inode, u8 attrs)
198{
OGAWA Hirofumi91834822008-11-06 12:53:54 -0800199 if (fat_mode_can_hold_ro(inode))
200 MSDOS_I(inode)->i_attrs = attrs & ATTR_UNUSED;
201 else
202 MSDOS_I(inode)->i_attrs = attrs & (ATTR_UNUSED | ATTR_RO);
OGAWA Hirofumi9c0aa1b2008-11-06 12:53:54 -0800203}
204
OGAWA Hirofumi9e975da2008-11-06 12:53:46 -0800205static inline unsigned char fat_checksum(const __u8 *name)
206{
207 unsigned char s = name[0];
208 s = (s<<7) + (s>>1) + name[1]; s = (s<<7) + (s>>1) + name[2];
209 s = (s<<7) + (s>>1) + name[3]; s = (s<<7) + (s>>1) + name[4];
210 s = (s<<7) + (s>>1) + name[5]; s = (s<<7) + (s>>1) + name[6];
211 s = (s<<7) + (s>>1) + name[7]; s = (s<<7) + (s>>1) + name[8];
212 s = (s<<7) + (s>>1) + name[9]; s = (s<<7) + (s>>1) + name[10];
213 return s;
214}
215
216static inline sector_t fat_clus_to_blknr(struct msdos_sb_info *sbi, int clus)
217{
218 return ((sector_t)clus - FAT_START_ENT) * sbi->sec_per_clus
219 + sbi->data_start;
220}
221
Namjae Jeone22a4442013-04-29 16:21:10 -0700222static inline void fat_get_blknr_offset(struct msdos_sb_info *sbi,
223 loff_t i_pos, sector_t *blknr, int *offset)
224{
225 *blknr = i_pos >> sbi->dir_per_block_bits;
226 *offset = i_pos & (sbi->dir_per_block - 1);
227}
228
Namjae Jeonf21735d2013-04-29 16:21:09 -0700229static inline loff_t fat_i_pos_read(struct msdos_sb_info *sbi,
230 struct inode *inode)
231{
232 loff_t i_pos;
233#if BITS_PER_LONG == 32
234 spin_lock(&sbi->inode_hash_lock);
235#endif
236 i_pos = MSDOS_I(inode)->i_pos;
237#if BITS_PER_LONG == 32
238 spin_unlock(&sbi->inode_hash_lock);
239#endif
240 return i_pos;
241}
242
OGAWA Hirofumi9e975da2008-11-06 12:53:46 -0800243static inline void fat16_towchar(wchar_t *dst, const __u8 *src, size_t len)
244{
245#ifdef __BIG_ENDIAN
246 while (len--) {
247 *dst++ = src[0] | (src[1] << 8);
248 src += 2;
249 }
250#else
251 memcpy(dst, src, len * 2);
252#endif
253}
254
Steven J. Magnania943ed72012-07-30 14:42:13 -0700255static inline int fat_get_start(const struct msdos_sb_info *sbi,
256 const struct msdos_dir_entry *de)
257{
258 int cluster = le16_to_cpu(de->start);
259 if (sbi->fat_bits == 32)
260 cluster |= (le16_to_cpu(de->starthi) << 16);
261 return cluster;
262}
263
264static inline void fat_set_start(struct msdos_dir_entry *de, int cluster)
265{
266 de->start = cpu_to_le16(cluster);
267 de->starthi = cpu_to_le16(cluster >> 16);
268}
269
OGAWA Hirofumi9e975da2008-11-06 12:53:46 -0800270static inline void fatwchar_to16(__u8 *dst, const wchar_t *src, size_t len)
271{
272#ifdef __BIG_ENDIAN
273 while (len--) {
274 dst[0] = *src & 0x00FF;
275 dst[1] = (*src & 0xFF00) >> 8;
276 dst += 2;
277 src++;
278 }
279#else
280 memcpy(dst, src, len * 2);
281#endif
282}
283
284/* fat/cache.c */
285extern void fat_cache_inval_inode(struct inode *inode);
286extern int fat_get_cluster(struct inode *inode, int cluster,
287 int *fclus, int *dclus);
288extern int fat_bmap(struct inode *inode, sector_t sector, sector_t *phys,
OGAWA Hirofumi2bdf67e2008-11-06 12:53:57 -0800289 unsigned long *mapped_blocks, int create);
OGAWA Hirofumi9e975da2008-11-06 12:53:46 -0800290
291/* fat/dir.c */
292extern const struct file_operations fat_dir_operations;
293extern int fat_search_long(struct inode *inode, const unsigned char *name,
294 int name_len, struct fat_slot_info *sinfo);
295extern int fat_dir_empty(struct inode *dir);
296extern int fat_subdirs(struct inode *dir);
297extern int fat_scan(struct inode *dir, const unsigned char *name,
298 struct fat_slot_info *sinfo);
Namjae Jeonf1e6fb02013-04-29 16:21:14 -0700299extern int fat_scan_logstart(struct inode *dir, int i_logstart,
300 struct fat_slot_info *sinfo);
OGAWA Hirofumi9e975da2008-11-06 12:53:46 -0800301extern int fat_get_dotdot_entry(struct inode *dir, struct buffer_head **bh,
Steven J. Magnani7669e8f2012-10-04 17:14:45 -0700302 struct msdos_dir_entry **de);
OGAWA Hirofumi9e975da2008-11-06 12:53:46 -0800303extern int fat_alloc_new_dir(struct inode *dir, struct timespec *ts);
304extern int fat_add_entries(struct inode *dir, void *slots, int nr_slots,
305 struct fat_slot_info *sinfo);
306extern int fat_remove_entries(struct inode *dir, struct fat_slot_info *sinfo);
307
308/* fat/fatent.c */
309struct fat_entry {
310 int entry;
311 union {
312 u8 *ent12_p[2];
313 __le16 *ent16_p;
314 __le32 *ent32_p;
315 } u;
316 int nr_bhs;
317 struct buffer_head *bhs[2];
Al Virob5224122009-06-07 13:44:36 -0400318 struct inode *fat_inode;
OGAWA Hirofumi9e975da2008-11-06 12:53:46 -0800319};
320
321static inline void fatent_init(struct fat_entry *fatent)
322{
323 fatent->nr_bhs = 0;
324 fatent->entry = 0;
325 fatent->u.ent32_p = NULL;
326 fatent->bhs[0] = fatent->bhs[1] = NULL;
Al Virob5224122009-06-07 13:44:36 -0400327 fatent->fat_inode = NULL;
OGAWA Hirofumi9e975da2008-11-06 12:53:46 -0800328}
329
330static inline void fatent_set_entry(struct fat_entry *fatent, int entry)
331{
332 fatent->entry = entry;
333 fatent->u.ent32_p = NULL;
334}
335
336static inline void fatent_brelse(struct fat_entry *fatent)
337{
338 int i;
339 fatent->u.ent32_p = NULL;
340 for (i = 0; i < fatent->nr_bhs; i++)
341 brelse(fatent->bhs[i]);
342 fatent->nr_bhs = 0;
343 fatent->bhs[0] = fatent->bhs[1] = NULL;
Al Virob5224122009-06-07 13:44:36 -0400344 fatent->fat_inode = NULL;
OGAWA Hirofumi9e975da2008-11-06 12:53:46 -0800345}
346
347extern void fat_ent_access_init(struct super_block *sb);
348extern int fat_ent_read(struct inode *inode, struct fat_entry *fatent,
349 int entry);
350extern int fat_ent_write(struct inode *inode, struct fat_entry *fatent,
351 int new, int wait);
352extern int fat_alloc_clusters(struct inode *inode, int *cluster,
353 int nr_cluster);
354extern int fat_free_clusters(struct inode *inode, int cluster);
355extern int fat_count_free_clusters(struct super_block *sb);
356
357/* fat/file.c */
Arnd Bergmann7845bc3e2010-05-17 08:13:47 +0900358extern long fat_generic_ioctl(struct file *filp, unsigned int cmd,
359 unsigned long arg);
OGAWA Hirofumi9e975da2008-11-06 12:53:46 -0800360extern const struct file_operations fat_file_operations;
361extern const struct inode_operations fat_file_inode_operations;
Cruz Julian Bishopd5a4a382012-10-04 17:14:49 -0700362extern int fat_setattr(struct dentry *dentry, struct iattr *attr);
npiggin@suse.de459f6ed2010-05-27 01:05:38 +1000363extern void fat_truncate_blocks(struct inode *inode, loff_t offset);
OGAWA Hirofumi9e975da2008-11-06 12:53:46 -0800364extern int fat_getattr(struct vfsmount *mnt, struct dentry *dentry,
365 struct kstat *stat);
Josef Bacik02c24a82011-07-16 20:44:56 -0400366extern int fat_file_fsync(struct file *file, loff_t start, loff_t end,
367 int datasync);
OGAWA Hirofumi9e975da2008-11-06 12:53:46 -0800368
369/* fat/inode.c */
Namjae Jeonc0ef0cc2014-12-12 16:57:26 -0800370extern int fat_block_truncate_page(struct inode *inode, loff_t from);
OGAWA Hirofumi9e975da2008-11-06 12:53:46 -0800371extern void fat_attach(struct inode *inode, loff_t i_pos);
372extern void fat_detach(struct inode *inode);
373extern struct inode *fat_iget(struct super_block *sb, loff_t i_pos);
374extern struct inode *fat_build_inode(struct super_block *sb,
375 struct msdos_dir_entry *de, loff_t i_pos);
376extern int fat_sync_inode(struct inode *inode);
377extern int fat_fill_super(struct super_block *sb, void *data, int silent,
OGAWA Hirofumi384f5c92011-04-12 21:08:37 +0900378 int isvfat, void (*setup)(struct super_block *));
Namjae Jeonf1e6fb02013-04-29 16:21:14 -0700379extern int fat_fill_inode(struct inode *inode, struct msdos_dir_entry *de);
OGAWA Hirofumi9e975da2008-11-06 12:53:46 -0800380
381extern int fat_flush_inodes(struct super_block *sb, struct inode *i1,
Cruz Julian Bishopd5a4a382012-10-04 17:14:49 -0700382 struct inode *i2);
Steven J. Magnani7669e8f2012-10-04 17:14:45 -0700383static inline unsigned long fat_dir_hash(int logstart)
Steven J. Magnani21b6633d52012-10-04 17:14:44 -0700384{
Steven J. Magnani7669e8f2012-10-04 17:14:45 -0700385 return hash_32(logstart, FAT_HASH_BITS);
Steven J. Magnani21b6633d52012-10-04 17:14:44 -0700386}
387
OGAWA Hirofumi9e975da2008-11-06 12:53:46 -0800388/* fat/misc.c */
Joe Perchesb9075fa2011-10-31 17:11:33 -0700389extern __printf(3, 4) __cold
390void __fat_fs_error(struct super_block *sb, int report, const char *fmt, ...);
Alexey Fisher2c8a5ff2011-04-12 21:08:38 +0900391#define fat_fs_error(sb, fmt, args...) \
392 __fat_fs_error(sb, 1, fmt , ## args)
393#define fat_fs_error_ratelimit(sb, fmt, args...) \
394 __fat_fs_error(sb, __ratelimit(&MSDOS_SB(sb)->ratelimit), fmt , ## args)
Joe Perchesb9075fa2011-10-31 17:11:33 -0700395__printf(3, 4) __cold
396void fat_msg(struct super_block *sb, const char *level, const char *fmt, ...);
Namjae Jeonb742c342012-05-31 16:26:13 -0700397#define fat_msg_ratelimit(sb, level, fmt, args...) \
398 do { \
399 if (__ratelimit(&MSDOS_SB(sb)->ratelimit)) \
400 fat_msg(sb, level, fmt, ## args); \
401 } while (0)
OGAWA Hirofumied248b22009-09-20 01:31:58 +0900402extern int fat_clusters_flush(struct super_block *sb);
OGAWA Hirofumi9e975da2008-11-06 12:53:46 -0800403extern int fat_chain_add(struct inode *inode, int new_dclus, int nr_cluster);
OGAWA Hirofumi7decd1c2008-11-06 12:53:47 -0800404extern void fat_time_fat2unix(struct msdos_sb_info *sbi, struct timespec *ts,
405 __le16 __time, __le16 __date, u8 time_cs);
406extern void fat_time_unix2fat(struct msdos_sb_info *sbi, struct timespec *ts,
407 __le16 *time, __le16 *date, u8 *time_cs);
OGAWA Hirofumi9e975da2008-11-06 12:53:46 -0800408extern int fat_sync_bhs(struct buffer_head **bhs, int nr_bhs);
409
410int fat_cache_init(void);
411void fat_cache_destroy(void);
412
Steven J. Magnani21b6633d52012-10-04 17:14:44 -0700413/* fat/nfs.c */
Namjae Jeonea3983a2013-04-29 16:21:11 -0700414extern const struct export_operations fat_export_ops;
415extern const struct export_operations fat_export_ops_nostale;
Steven J. Magnani21b6633d52012-10-04 17:14:44 -0700416
OGAWA Hirofumic3302932008-11-06 12:53:58 -0800417/* helper for printk */
418typedef unsigned long long llu;
419
OGAWA Hirofumi9e975da2008-11-06 12:53:46 -0800420#endif /* !_FAT_H */