[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / fat / fat.h

#ifndef _FAT_H
#define _FAT_H

#include <linux/buffer_head.h>
#include <linux/string.h>
#include <linux/nls.h>
#include <linux/fs.h>
#include <linux/mutex.h>
#include <linux/msdos_fs.h>

/*
 * vfat shortname flags
 */
#define VFAT_SFN_DISPLAY_LOWER	0x0001 /* convert to lowercase for display */
#define VFAT_SFN_DISPLAY_WIN95	0x0002 /* emulate win95 rule for display */
#define VFAT_SFN_DISPLAY_WINNT	0x0004 /* emulate winnt rule for display */
#define VFAT_SFN_CREATE_WIN95	0x0100 /* emulate win95 rule for create */
#define VFAT_SFN_CREATE_WINNT	0x0200 /* emulate winnt rule for create */

#define FAT_ERRORS_CONT		1      /* ignore error and continue */
#define FAT_ERRORS_PANIC	2      /* panic on error */
#define FAT_ERRORS_RO		3      /* remount r/o on error */

struct fat_mount_options {
	uid_t fs_uid;
	gid_t fs_gid;
	unsigned short fs_fmask;
	unsigned short fs_dmask;
	unsigned short codepage;  /* Codepage for shortname conversions */
	char *iocharset;          /* Charset used for filename input/display */
	unsigned short shortname; /* flags for shortname display/create rule */
	unsigned char name_check; /* r = relaxed, n = normal, s = strict */
	unsigned char errors;	  /* On error: continue, panic, remount-ro */
	unsigned short allow_utime;/* permission for setting the [am]time */
	unsigned quiet:1,         /* set = fake successful chmods and chowns */
		 showexec:1,      /* set = only set x bit for com/exe/bat */
		 sys_immutable:1, /* set = system files are immutable */
		 dotsOK:1,        /* set = hidden and system files are named '.filename' */
		 isvfat:1,        /* 0=no vfat long filename support, 1=vfat support */
		 utf8:1,	  /* Use of UTF-8 character set (Default) */
		 unicode_xlate:1, /* create escape sequences for unhandled Unicode */
		 numtail:1,       /* Does first alias have a numeric '~1' type tail? */
		 flush:1,	  /* write things quickly */
		 nocase:1,	  /* Does this need case conversion? 0=need case conversion*/
		 usefree:1,	  /* Use free_clusters for FAT32 */
		 tz_utc:1,	  /* Filesystem timestamps are in UTC */
		 rodir:1,	  /* allow ATTR_RO for directory */
		 discard:1;	  /* Issue discard requests on deletions */
};

#define FAT_HASH_BITS	8
#define FAT_HASH_SIZE	(1UL << FAT_HASH_BITS)

/*
 * MS-DOS file system in-core superblock data
 */
struct msdos_sb_info {
	unsigned short sec_per_clus; /* sectors/cluster */
	unsigned short cluster_bits; /* log2(cluster_size) */
	unsigned int cluster_size;   /* cluster size */
	unsigned char fats,fat_bits; /* number of FATs, FAT bits (12 or 16) */
	unsigned short fat_start;
	unsigned long fat_length;    /* FAT start & length (sec.) */
	unsigned long dir_start;
	unsigned short dir_entries;  /* root dir start & entries */
	unsigned long data_start;    /* first data sector */
	unsigned long max_cluster;   /* maximum cluster number */
	unsigned long root_cluster;  /* first cluster of the root directory */
	unsigned long fsinfo_sector; /* sector number of FAT32 fsinfo */
	struct mutex fat_lock;
	unsigned int prev_free;      /* previously allocated cluster number */
	unsigned int free_clusters;  /* -1 if undefined */
	unsigned int free_clus_valid; /* is free_clusters valid? */
	struct fat_mount_options options;
	struct nls_table *nls_disk;  /* Codepage used on disk */
	struct nls_table *nls_io;    /* Charset used for input and display */
	const void *dir_ops;		     /* Opaque; default directory operations */
	int dir_per_block;	     /* dir entries per block */
	int dir_per_block_bits;	     /* log2(dir_per_block) */

	int fatent_shift;
	struct fatent_operations *fatent_ops;
	struct inode *fat_inode;

	spinlock_t inode_hash_lock;
	struct hlist_head inode_hashtable[FAT_HASH_SIZE];
};

#define FAT_CACHE_VALID	0	/* special case for valid cache */

/*
 * MS-DOS file system inode data in memory
 */
struct msdos_inode_info {
	spinlock_t cache_lru_lock;
	struct list_head cache_lru;
	int nr_caches;
	/* for avoiding the race between fat_free() and fat_get_cluster() */
	unsigned int cache_valid_id;

	/* NOTE: mmu_private is 64bits, so must hold ->i_mutex to access */
	loff_t mmu_private;	/* physically allocated size */

	int i_start;		/* first cluster or 0 */
	int i_logstart;		/* logical first cluster */
	int i_attrs;		/* unused attribute bits */
	loff_t i_pos;		/* on-disk position of directory entry or 0 */
	struct hlist_node i_fat_hash;	/* hash by i_location */
	struct inode vfs_inode;
};

struct fat_slot_info {
	loff_t i_pos;		/* on-disk position of directory entry */
	loff_t slot_off;	/* offset for slot or de start */
	int nr_slots;		/* number of slots + 1(de) in filename */
	struct msdos_dir_entry *de;
	struct buffer_head *bh;
};

static inline struct msdos_sb_info *MSDOS_SB(struct super_block *sb)
{
	return sb->s_fs_info;
}

static inline struct msdos_inode_info *MSDOS_I(struct inode *inode)
{
	return container_of(inode, struct msdos_inode_info, vfs_inode);
}

/*
 * If ->i_mode can't hold S_IWUGO (i.e. ATTR_RO), we use ->i_attrs to
 * save ATTR_RO instead of ->i_mode.
 *
 * If it's directory and !sbi->options.rodir, ATTR_RO isn't read-only
 * bit, it's just used as flag for app.
 */
static inline int fat_mode_can_hold_ro(struct inode *inode)
{
	struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb);
	mode_t mask;

	if (S_ISDIR(inode->i_mode)) {
		if (!sbi->options.rodir)
			return 0;
		mask = ~sbi->options.fs_dmask;
	} else
		mask = ~sbi->options.fs_fmask;

	if (!(mask & S_IWUGO))
		return 0;
	return 1;
}

/* Convert attribute bits and a mask to the UNIX mode. */
static inline mode_t fat_make_mode(struct msdos_sb_info *sbi,
				   u8 attrs, mode_t mode)
{
	if (attrs & ATTR_RO && !((attrs & ATTR_DIR) && !sbi->options.rodir))
		mode &= ~S_IWUGO;

	if (attrs & ATTR_DIR)
		return (mode & ~sbi->options.fs_dmask) | S_IFDIR;
	else
		return (mode & ~sbi->options.fs_fmask) | S_IFREG;
}

/* Return the FAT attribute byte for this inode */
static inline u8 fat_make_attrs(struct inode *inode)
{
	u8 attrs = MSDOS_I(inode)->i_attrs;
	if (S_ISDIR(inode->i_mode))
		attrs |= ATTR_DIR;
	if (fat_mode_can_hold_ro(inode) && !(inode->i_mode & S_IWUGO))
		attrs |= ATTR_RO;
	return attrs;
}

static inline void fat_save_attrs(struct inode *inode, u8 attrs)
{
	if (fat_mode_can_hold_ro(inode))
		MSDOS_I(inode)->i_attrs = attrs & ATTR_UNUSED;
	else
		MSDOS_I(inode)->i_attrs = attrs & (ATTR_UNUSED | ATTR_RO);
}

static inline unsigned char fat_checksum(const __u8 *name)
{
	unsigned char s = name[0];
	s = (s<<7) + (s>>1) + name[1];	s = (s<<7) + (s>>1) + name[2];
	s = (s<<7) + (s>>1) + name[3];	s = (s<<7) + (s>>1) + name[4];
	s = (s<<7) + (s>>1) + name[5];	s = (s<<7) + (s>>1) + name[6];
	s = (s<<7) + (s>>1) + name[7];	s = (s<<7) + (s>>1) + name[8];
	s = (s<<7) + (s>>1) + name[9];	s = (s<<7) + (s>>1) + name[10];
	return s;
}

static inline sector_t fat_clus_to_blknr(struct msdos_sb_info *sbi, int clus)
{
	return ((sector_t)clus - FAT_START_ENT) * sbi->sec_per_clus
		+ sbi->data_start;
}

static inline void fat16_towchar(wchar_t *dst, const __u8 *src, size_t len)
{
#ifdef __BIG_ENDIAN
	while (len--) {
		*dst++ = src[0] | (src[1] << 8);
		src += 2;
	}
#else
	memcpy(dst, src, len * 2);
#endif
}

static inline void fatwchar_to16(__u8 *dst, const wchar_t *src, size_t len)
{
#ifdef __BIG_ENDIAN
	while (len--) {
		dst[0] = *src & 0x00FF;
		dst[1] = (*src & 0xFF00) >> 8;
		dst += 2;
		src++;
	}
#else
	memcpy(dst, src, len * 2);
#endif
}

/* fat/cache.c */
extern void fat_cache_inval_inode(struct inode *inode);
extern int fat_get_cluster(struct inode *inode, int cluster,
			   int *fclus, int *dclus);
extern int fat_bmap(struct inode *inode, sector_t sector, sector_t *phys,
		    unsigned long *mapped_blocks, int create);

/* fat/dir.c */
extern const struct file_operations fat_dir_operations;
extern int fat_search_long(struct inode *inode, const unsigned char *name,
			   int name_len, struct fat_slot_info *sinfo);
extern int fat_dir_empty(struct inode *dir);
extern int fat_subdirs(struct inode *dir);
extern int fat_scan(struct inode *dir, const unsigned char *name,
		    struct fat_slot_info *sinfo);
extern int fat_get_dotdot_entry(struct inode *dir, struct buffer_head **bh,
				struct msdos_dir_entry **de, loff_t *i_pos);
extern int fat_alloc_new_dir(struct inode *dir, struct timespec *ts);
extern int fat_add_entries(struct inode *dir, void *slots, int nr_slots,
			   struct fat_slot_info *sinfo);
extern int fat_remove_entries(struct inode *dir, struct fat_slot_info *sinfo);

/* fat/fatent.c */
struct fat_entry {
	int entry;
	union {
		u8 *ent12_p[2];
		__le16 *ent16_p;
		__le32 *ent32_p;
	} u;
	int nr_bhs;
	struct buffer_head *bhs[2];
	struct inode *fat_inode;
};

static inline void fatent_init(struct fat_entry *fatent)
{
	fatent->nr_bhs = 0;
	fatent->entry = 0;
	fatent->u.ent32_p = NULL;
	fatent->bhs[0] = fatent->bhs[1] = NULL;
	fatent->fat_inode = NULL;
}

static inline void fatent_set_entry(struct fat_entry *fatent, int entry)
{
	fatent->entry = entry;
	fatent->u.ent32_p = NULL;
}

static inline void fatent_brelse(struct fat_entry *fatent)
{
	int i;
	fatent->u.ent32_p = NULL;
	for (i = 0; i < fatent->nr_bhs; i++)
		brelse(fatent->bhs[i]);
	fatent->nr_bhs = 0;
	fatent->bhs[0] = fatent->bhs[1] = NULL;
	fatent->fat_inode = NULL;
}

extern void fat_ent_access_init(struct super_block *sb);
extern int fat_ent_read(struct inode *inode, struct fat_entry *fatent,
			int entry);
extern int fat_ent_write(struct inode *inode, struct fat_entry *fatent,
			 int new, int wait);
extern int fat_alloc_clusters(struct inode *inode, int *cluster,
			      int nr_cluster);
extern int fat_free_clusters(struct inode *inode, int cluster);
extern int fat_count_free_clusters(struct super_block *sb);

/* fat/file.c */
extern int fat_generic_ioctl(struct inode *inode, struct file *filp,
			     unsigned int cmd, unsigned long arg);
extern const struct file_operations fat_file_operations;
extern const struct inode_operations fat_file_inode_operations;
extern int fat_setattr(struct dentry * dentry, struct iattr * attr);
extern void fat_truncate(struct inode *inode);
extern int fat_getattr(struct vfsmount *mnt, struct dentry *dentry,
		       struct kstat *stat);
extern int fat_file_fsync(struct file *file, struct dentry *dentry,
			  int datasync);

/* fat/inode.c */
extern void fat_attach(struct inode *inode, loff_t i_pos);
extern void fat_detach(struct inode *inode);
extern struct inode *fat_iget(struct super_block *sb, loff_t i_pos);
extern struct inode *fat_build_inode(struct super_block *sb,
			struct msdos_dir_entry *de, loff_t i_pos);
extern int fat_sync_inode(struct inode *inode);
extern int fat_fill_super(struct super_block *sb, void *data, int silent,
			const struct inode_operations *fs_dir_inode_ops, int isvfat);

extern int fat_flush_inodes(struct super_block *sb, struct inode *i1,
		            struct inode *i2);
/* fat/misc.c */
extern void fat_fs_error(struct super_block *s, const char *fmt, ...)
	__attribute__ ((format (printf, 2, 3))) __cold;
extern int fat_clusters_flush(struct super_block *sb);
extern int fat_chain_add(struct inode *inode, int new_dclus, int nr_cluster);
extern void fat_time_fat2unix(struct msdos_sb_info *sbi, struct timespec *ts,
			      __le16 __time, __le16 __date, u8 time_cs);
extern void fat_time_unix2fat(struct msdos_sb_info *sbi, struct timespec *ts,
			      __le16 *time, __le16 *date, u8 *time_cs);
extern int fat_sync_bhs(struct buffer_head **bhs, int nr_bhs);

int fat_cache_init(void);
void fat_cache_destroy(void);

/* helper for printk */
typedef unsigned long long	llu;

#endif /* !_FAT_H */
Commit	Line	Data
9e975dae OH	1	#ifndef _FAT_H
	2	#define _FAT_H
	3
	4	#include <linux/buffer_head.h>
	5	#include <linux/string.h>
	6	#include <linux/nls.h>
	7	#include <linux/fs.h>
	8	#include <linux/mutex.h>
	9	#include <linux/msdos_fs.h>
	10
	11	/*
	12	* vfat shortname flags
	13	*/
	14	#define VFAT_SFN_DISPLAY_LOWER 0x0001 /* convert to lowercase for display */
	15	#define VFAT_SFN_DISPLAY_WIN95 0x0002 /* emulate win95 rule for display */
	16	#define VFAT_SFN_DISPLAY_WINNT 0x0004 /* emulate winnt rule for display */
	17	#define VFAT_SFN_CREATE_WIN95 0x0100 /* emulate win95 rule for create */
	18	#define VFAT_SFN_CREATE_WINNT 0x0200 /* emulate winnt rule for create */
	19
85c78591 DK	20	#define FAT_ERRORS_CONT 1 /* ignore error and continue */
	21	#define FAT_ERRORS_PANIC 2 /* panic on error */
	22	#define FAT_ERRORS_RO 3 /* remount r/o on error */
	23
9e975dae OH	24	struct fat_mount_options {
	25	uid_t fs_uid;
	26	gid_t fs_gid;
	27	unsigned short fs_fmask;
	28	unsigned short fs_dmask;
	29	unsigned short codepage; /* Codepage for shortname conversions */
	30	char iocharset; / Charset used for filename input/display */
	31	unsigned short shortname; /* flags for shortname display/create rule */
	32	unsigned char name_check; /* r = relaxed, n = normal, s = strict */
85c78591	33	unsigned char errors; /* On error: continue, panic, remount-ro */
9e975dae OH	34	unsigned short allow_utime;/* permission for setting the [am]time */
	35	unsigned quiet:1, /* set = fake successful chmods and chowns */
	36	showexec:1, /* set = only set x bit for com/exe/bat */
	37	sys_immutable:1, /* set = system files are immutable */
	38	dotsOK:1, /* set = hidden and system files are named '.filename' */
	39	isvfat:1, /* 0=no vfat long filename support, 1=vfat support */
	40	utf8:1, /* Use of UTF-8 character set (Default) */
	41	unicode_xlate:1, /* create escape sequences for unhandled Unicode */
	42	numtail:1, /* Does first alias have a numeric '~1' type tail? */
	43	flush:1, /* write things quickly */
	44	nocase:1, /* Does this need case conversion? 0=need case conversion*/
	45	usefree:1, /* Use free_clusters for FAT32 */
dfc209c0	46	tz_utc:1, /* Filesystem timestamps are in UTC */
681142f9 CH	47	rodir:1, /* allow ATTR_RO for directory */
681142f9 CH	48	discard:1; /* Issue discard requests on deletions */
9e975dae OH	49	};
	50
	51	#define FAT_HASH_BITS 8
	52	#define FAT_HASH_SIZE (1UL << FAT_HASH_BITS)
9e975dae OH	53
	54	/*
	55	* MS-DOS file system in-core superblock data
	56	*/
	57	struct msdos_sb_info {
	58	unsigned short sec_per_clus; /* sectors/cluster */
	59	unsigned short cluster_bits; /* log2(cluster_size) */
	60	unsigned int cluster_size; /* cluster size */
	61	unsigned char fats,fat_bits; /* number of FATs, FAT bits (12 or 16) */
	62	unsigned short fat_start;
	63	unsigned long fat_length; /* FAT start & length (sec.) */
	64	unsigned long dir_start;
	65	unsigned short dir_entries; /* root dir start & entries */
	66	unsigned long data_start; /* first data sector */
	67	unsigned long max_cluster; /* maximum cluster number */
	68	unsigned long root_cluster; /* first cluster of the root directory */
	69	unsigned long fsinfo_sector; /* sector number of FAT32 fsinfo */
	70	struct mutex fat_lock;
	71	unsigned int prev_free; /* previously allocated cluster number */
	72	unsigned int free_clusters; /* -1 if undefined */
	73	unsigned int free_clus_valid; /* is free_clusters valid? */
	74	struct fat_mount_options options;
	75	struct nls_table nls_disk; / Codepage used on disk */
	76	struct nls_table nls_io; / Charset used for input and display */
	77	const void dir_ops; / Opaque; default directory operations */
	78	int dir_per_block; /* dir entries per block */
	79	int dir_per_block_bits; /* log2(dir_per_block) */
	80
	81	int fatent_shift;
	82	struct fatent_operations *fatent_ops;
b522412a	83	struct inode *fat_inode;
9e975dae OH	84
	85	spinlock_t inode_hash_lock;
	86	struct hlist_head inode_hashtable[FAT_HASH_SIZE];
	87	};
	88
	89	#define FAT_CACHE_VALID 0 /* special case for valid cache */
	90
	91	/*
	92	* MS-DOS file system inode data in memory
	93	*/
	94	struct msdos_inode_info {
	95	spinlock_t cache_lru_lock;
	96	struct list_head cache_lru;
	97	int nr_caches;
	98	/* for avoiding the race between fat_free() and fat_get_cluster() */
	99	unsigned int cache_valid_id;
	100
2bdf67eb OH	101	/* NOTE: mmu_private is 64bits, so must hold ->i_mutex to access */
	102	loff_t mmu_private; /* physically allocated size */
	103
9e975dae OH	104	int i_start; /* first cluster or 0 */
	105	int i_logstart; /* logical first cluster */
	106	int i_attrs; /* unused attribute bits */
	107	loff_t i_pos; /* on-disk position of directory entry or 0 */
	108	struct hlist_node i_fat_hash; /* hash by i_location */
	109	struct inode vfs_inode;
	110	};
	111
	112	struct fat_slot_info {
	113	loff_t i_pos; /* on-disk position of directory entry */
	114	loff_t slot_off; /* offset for slot or de start */
	115	int nr_slots; /* number of slots + 1(de) in filename */
	116	struct msdos_dir_entry *de;
	117	struct buffer_head *bh;
	118	};
	119
	120	static inline struct msdos_sb_info MSDOS_SB(struct super_block sb)
	121	{
	122	return sb->s_fs_info;
	123	}
	124
	125	static inline struct msdos_inode_info MSDOS_I(struct inode inode)
	126	{
	127	return container_of(inode, struct msdos_inode_info, vfs_inode);
	128	}
	129
9183482f OH	130	/*
	131	* If ->i_mode can't hold S_IWUGO (i.e. ATTR_RO), we use ->i_attrs to
	132	* save ATTR_RO instead of ->i_mode.
dfc209c0 OH	133	*
	134	* If it's directory and !sbi->options.rodir, ATTR_RO isn't read-only
	135	* bit, it's just used as flag for app.
9183482f OH	136	*/
	137	static inline int fat_mode_can_hold_ro(struct inode *inode)
	138	{
	139	struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb);
	140	mode_t mask;
	141
dfc209c0 OH	142	if (S_ISDIR(inode->i_mode)) {
	143	if (!sbi->options.rodir)
	144	return 0;
9183482f	145	mask = ~sbi->options.fs_dmask;
dfc209c0	146	} else
9183482f OH	147	mask = ~sbi->options.fs_fmask;
	148
	149	if (!(mask & S_IWUGO))
	150	return 0;
	151	return 1;
	152	}
	153
9c0aa1b8 OH	154	/* Convert attribute bits and a mask to the UNIX mode. */
	155	static inline mode_t fat_make_mode(struct msdos_sb_info *sbi,
	156	u8 attrs, mode_t mode)
	157	{
dfc209c0	158	if (attrs & ATTR_RO && !((attrs & ATTR_DIR) && !sbi->options.rodir))
9c0aa1b8 OH	159	mode &= ~S_IWUGO;
	160
	161	if (attrs & ATTR_DIR)
	162	return (mode & ~sbi->options.fs_dmask) \| S_IFDIR;
	163	else
	164	return (mode & ~sbi->options.fs_fmask) \| S_IFREG;
	165	}
	166
9e975dae	167	/* Return the FAT attribute byte for this inode */
9c0aa1b8	168	static inline u8 fat_make_attrs(struct inode *inode)
9e975dae	169	{
9183482f OH	170	u8 attrs = MSDOS_I(inode)->i_attrs;
	171	if (S_ISDIR(inode->i_mode))
	172	attrs \|= ATTR_DIR;
	173	if (fat_mode_can_hold_ro(inode) && !(inode->i_mode & S_IWUGO))
	174	attrs \|= ATTR_RO;
	175	return attrs;
9e975dae OH	176	}
9e975dae OH	177
9c0aa1b8 OH	178	static inline void fat_save_attrs(struct inode *inode, u8 attrs)
9c0aa1b8 OH	179	{
9183482f OH	180	if (fat_mode_can_hold_ro(inode))
	181	MSDOS_I(inode)->i_attrs = attrs & ATTR_UNUSED;
	182	else
	183	MSDOS_I(inode)->i_attrs = attrs & (ATTR_UNUSED \| ATTR_RO);
9c0aa1b8 OH	184	}
9c0aa1b8 OH	185
9e975dae OH	186	static inline unsigned char fat_checksum(const __u8 *name)
	187	{
	188	unsigned char s = name[0];
	189	s = (s<<7) + (s>>1) + name[1]; s = (s<<7) + (s>>1) + name[2];
	190	s = (s<<7) + (s>>1) + name[3]; s = (s<<7) + (s>>1) + name[4];
	191	s = (s<<7) + (s>>1) + name[5]; s = (s<<7) + (s>>1) + name[6];
	192	s = (s<<7) + (s>>1) + name[7]; s = (s<<7) + (s>>1) + name[8];
	193	s = (s<<7) + (s>>1) + name[9]; s = (s<<7) + (s>>1) + name[10];
	194	return s;
	195	}
	196
	197	static inline sector_t fat_clus_to_blknr(struct msdos_sb_info *sbi, int clus)
	198	{
	199	return ((sector_t)clus - FAT_START_ENT) * sbi->sec_per_clus
	200	+ sbi->data_start;
	201	}
	202
	203	static inline void fat16_towchar(wchar_t dst, const __u8 src, size_t len)
	204	{
	205	#ifdef __BIG_ENDIAN
	206	while (len--) {
	207	*dst++ = src[0] \| (src[1] << 8);
	208	src += 2;
	209	}
	210	#else
	211	memcpy(dst, src, len * 2);
	212	#endif
	213	}
	214
	215	static inline void fatwchar_to16(__u8 dst, const wchar_t src, size_t len)
	216	{
	217	#ifdef __BIG_ENDIAN
	218	while (len--) {
	219	dst[0] = *src & 0x00FF;
	220	dst[1] = (*src & 0xFF00) >> 8;
	221	dst += 2;
	222	src++;
	223	}
	224	#else
	225	memcpy(dst, src, len * 2);
	226	#endif
	227	}
	228
	229	/* fat/cache.c */
	230	extern void fat_cache_inval_inode(struct inode *inode);
	231	extern int fat_get_cluster(struct inode *inode, int cluster,
	232	int fclus, int dclus);
	233	extern int fat_bmap(struct inode inode, sector_t sector, sector_t phys,
2bdf67eb	234	unsigned long *mapped_blocks, int create);
9e975dae OH	235
	236	/* fat/dir.c */
	237	extern const struct file_operations fat_dir_operations;
	238	extern int fat_search_long(struct inode inode, const unsigned char name,
	239	int name_len, struct fat_slot_info *sinfo);
	240	extern int fat_dir_empty(struct inode *dir);
	241	extern int fat_subdirs(struct inode *dir);
	242	extern int fat_scan(struct inode dir, const unsigned char name,
	243	struct fat_slot_info *sinfo);
	244	extern int fat_get_dotdot_entry(struct inode dir, struct buffer_head *bh,
	245	struct msdos_dir_entry *de, loff_t i_pos);
	246	extern int fat_alloc_new_dir(struct inode dir, struct timespec ts);
	247	extern int fat_add_entries(struct inode dir, void slots, int nr_slots,
	248	struct fat_slot_info *sinfo);
	249	extern int fat_remove_entries(struct inode dir, struct fat_slot_info sinfo);
	250
	251	/* fat/fatent.c */
	252	struct fat_entry {
	253	int entry;
	254	union {
	255	u8 *ent12_p[2];
	256	__le16 *ent16_p;
	257	__le32 *ent32_p;
	258	} u;
	259	int nr_bhs;
	260	struct buffer_head *bhs[2];
b522412a	261	struct inode *fat_inode;
9e975dae OH	262	};
	263
	264	static inline void fatent_init(struct fat_entry *fatent)
	265	{
	266	fatent->nr_bhs = 0;
	267	fatent->entry = 0;
	268	fatent->u.ent32_p = NULL;
	269	fatent->bhs[0] = fatent->bhs[1] = NULL;
b522412a	270	fatent->fat_inode = NULL;
9e975dae OH	271	}
	272
	273	static inline void fatent_set_entry(struct fat_entry *fatent, int entry)
	274	{
	275	fatent->entry = entry;
	276	fatent->u.ent32_p = NULL;
	277	}
	278
	279	static inline void fatent_brelse(struct fat_entry *fatent)
	280	{
	281	int i;
	282	fatent->u.ent32_p = NULL;
	283	for (i = 0; i < fatent->nr_bhs; i++)
	284	brelse(fatent->bhs[i]);
	285	fatent->nr_bhs = 0;
	286	fatent->bhs[0] = fatent->bhs[1] = NULL;
b522412a	287	fatent->fat_inode = NULL;
9e975dae OH	288	}
	289
	290	extern void fat_ent_access_init(struct super_block *sb);
	291	extern int fat_ent_read(struct inode inode, struct fat_entry fatent,
	292	int entry);
	293	extern int fat_ent_write(struct inode inode, struct fat_entry fatent,
	294	int new, int wait);
	295	extern int fat_alloc_clusters(struct inode inode, int cluster,
	296	int nr_cluster);
	297	extern int fat_free_clusters(struct inode *inode, int cluster);
	298	extern int fat_count_free_clusters(struct super_block *sb);
	299
	300	/* fat/file.c */
	301	extern int fat_generic_ioctl(struct inode inode, struct file filp,
	302	unsigned int cmd, unsigned long arg);
	303	extern const struct file_operations fat_file_operations;
	304	extern const struct inode_operations fat_file_inode_operations;
	305	extern int fat_setattr(struct dentry * dentry, struct iattr * attr);
	306	extern void fat_truncate(struct inode *inode);
	307	extern int fat_getattr(struct vfsmount mnt, struct dentry dentry,
	308	struct kstat *stat);
b522412a AV	309	extern int fat_file_fsync(struct file file, struct dentry dentry,
b522412a AV	310	int datasync);
9e975dae OH	311
	312	/* fat/inode.c */
	313	extern void fat_attach(struct inode *inode, loff_t i_pos);
	314	extern void fat_detach(struct inode *inode);
	315	extern struct inode fat_iget(struct super_block sb, loff_t i_pos);
	316	extern struct inode fat_build_inode(struct super_block sb,
	317	struct msdos_dir_entry *de, loff_t i_pos);
	318	extern int fat_sync_inode(struct inode *inode);
	319	extern int fat_fill_super(struct super_block sb, void data, int silent,
	320	const struct inode_operations *fs_dir_inode_ops, int isvfat);
	321
	322	extern int fat_flush_inodes(struct super_block sb, struct inode i1,
	323	struct inode *i2);
	324	/* fat/misc.c */
85c78591	325	extern void fat_fs_error(struct super_block s, const char fmt, ...)
0e75f5da	326	__attribute__ ((format (printf, 2, 3))) __cold;
ed248b29	327	extern int fat_clusters_flush(struct super_block *sb);
9e975dae	328	extern int fat_chain_add(struct inode *inode, int new_dclus, int nr_cluster);
7decd1cb OH	329	extern void fat_time_fat2unix(struct msdos_sb_info sbi, struct timespec ts,
	330	__le16 __time, __le16 __date, u8 time_cs);
	331	extern void fat_time_unix2fat(struct msdos_sb_info sbi, struct timespec ts,
	332	__le16 time, __le16 date, u8 *time_cs);
9e975dae OH	333	extern int fat_sync_bhs(struct buffer_head **bhs, int nr_bhs);
	334
	335	int fat_cache_init(void);
	336	void fat_cache_destroy(void);
	337
c3302931 OH	338	/* helper for printk */
	339	typedef unsigned long long llu;
	340
9e975dae	341	#endif /* !_FAT_H */