[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/ratelimit.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;
	struct inode *fsinfo_inode;

	struct ratelimit_state ratelimit;

	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 rw_semaphore truncate_lock; /* protect bmap against truncate */
	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);
	umode_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 umode_t fat_make_mode(struct msdos_sb_info *sbi,
				   u8 attrs, umode_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 long fat_generic_ioctl(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_blocks(struct inode *inode, loff_t offset);
extern int fat_getattr(struct vfsmount *mnt, struct dentry *dentry,
		       struct kstat *stat);
extern int fat_file_fsync(struct file *file, loff_t start, loff_t end,
			  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,
			  int isvfat, void (*setup)(struct super_block *));

extern int fat_flush_inodes(struct super_block *sb, struct inode *i1,
		            struct inode *i2);
/* fat/misc.c */
extern __printf(3, 4) __cold
void __fat_fs_error(struct super_block *sb, int report, const char *fmt, ...);
#define fat_fs_error(sb, fmt, args...)		\
	__fat_fs_error(sb, 1, fmt , ## args)
#define fat_fs_error_ratelimit(sb, fmt, args...) \
	__fat_fs_error(sb, __ratelimit(&MSDOS_SB(sb)->ratelimit), fmt , ## args)
__printf(3, 4) __cold
void fat_msg(struct super_block *sb, const char *level, const char *fmt, ...);
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>
aaa04b48	9	#include <linux/ratelimit.h>
9e975dae OH	10	#include <linux/msdos_fs.h>
	11
	12	/*
	13	* vfat shortname flags
	14	*/
	15	#define VFAT_SFN_DISPLAY_LOWER 0x0001 /* convert to lowercase for display */
	16	#define VFAT_SFN_DISPLAY_WIN95 0x0002 /* emulate win95 rule for display */
	17	#define VFAT_SFN_DISPLAY_WINNT 0x0004 /* emulate winnt rule for display */
	18	#define VFAT_SFN_CREATE_WIN95 0x0100 /* emulate win95 rule for create */
	19	#define VFAT_SFN_CREATE_WINNT 0x0200 /* emulate winnt rule for create */
	20
85c78591 DK	21	#define FAT_ERRORS_CONT 1 /* ignore error and continue */
	22	#define FAT_ERRORS_PANIC 2 /* panic on error */
	23	#define FAT_ERRORS_RO 3 /* remount r/o on error */
	24
9e975dae OH	25	struct fat_mount_options {
	26	uid_t fs_uid;
	27	gid_t fs_gid;
	28	unsigned short fs_fmask;
	29	unsigned short fs_dmask;
	30	unsigned short codepage; /* Codepage for shortname conversions */
	31	char iocharset; / Charset used for filename input/display */
	32	unsigned short shortname; /* flags for shortname display/create rule */
	33	unsigned char name_check; /* r = relaxed, n = normal, s = strict */
85c78591	34	unsigned char errors; /* On error: continue, panic, remount-ro */
9e975dae OH	35	unsigned short allow_utime;/* permission for setting the [am]time */
	36	unsigned quiet:1, /* set = fake successful chmods and chowns */
	37	showexec:1, /* set = only set x bit for com/exe/bat */
	38	sys_immutable:1, /* set = system files are immutable */
	39	dotsOK:1, /* set = hidden and system files are named '.filename' */
	40	isvfat:1, /* 0=no vfat long filename support, 1=vfat support */
	41	utf8:1, /* Use of UTF-8 character set (Default) */
	42	unicode_xlate:1, /* create escape sequences for unhandled Unicode */
	43	numtail:1, /* Does first alias have a numeric '~1' type tail? */
	44	flush:1, /* write things quickly */
	45	nocase:1, /* Does this need case conversion? 0=need case conversion*/
	46	usefree:1, /* Use free_clusters for FAT32 */
dfc209c0	47	tz_utc:1, /* Filesystem timestamps are in UTC */
681142f9 CH	48	rodir:1, /* allow ATTR_RO for directory */
681142f9 CH	49	discard:1; /* Issue discard requests on deletions */
9e975dae OH	50	};
	51
	52	#define FAT_HASH_BITS 8
	53	#define FAT_HASH_SIZE (1UL << FAT_HASH_BITS)
9e975dae OH	54
	55	/*
	56	* MS-DOS file system in-core superblock data
	57	*/
	58	struct msdos_sb_info {
	59	unsigned short sec_per_clus; /* sectors/cluster */
	60	unsigned short cluster_bits; /* log2(cluster_size) */
	61	unsigned int cluster_size; /* cluster size */
	62	unsigned char fats,fat_bits; /* number of FATs, FAT bits (12 or 16) */
	63	unsigned short fat_start;
	64	unsigned long fat_length; /* FAT start & length (sec.) */
	65	unsigned long dir_start;
	66	unsigned short dir_entries; /* root dir start & entries */
	67	unsigned long data_start; /* first data sector */
	68	unsigned long max_cluster; /* maximum cluster number */
	69	unsigned long root_cluster; /* first cluster of the root directory */
	70	unsigned long fsinfo_sector; /* sector number of FAT32 fsinfo */
	71	struct mutex fat_lock;
	72	unsigned int prev_free; /* previously allocated cluster number */
	73	unsigned int free_clusters; /* -1 if undefined */
	74	unsigned int free_clus_valid; /* is free_clusters valid? */
	75	struct fat_mount_options options;
	76	struct nls_table nls_disk; / Codepage used on disk */
	77	struct nls_table nls_io; / Charset used for input and display */
	78	const void dir_ops; / Opaque; default directory operations */
	79	int dir_per_block; /* dir entries per block */
	80	int dir_per_block_bits; /* log2(dir_per_block) */
	81
	82	int fatent_shift;
	83	struct fatent_operations *fatent_ops;
b522412a	84	struct inode *fat_inode;
020ac5b6	85	struct inode *fsinfo_inode;
9e975dae	86
aaa04b48 OH	87	struct ratelimit_state ratelimit;
aaa04b48 OH	88
9e975dae OH	89	spinlock_t inode_hash_lock;
	90	struct hlist_head inode_hashtable[FAT_HASH_SIZE];
	91	};
	92
	93	#define FAT_CACHE_VALID 0 /* special case for valid cache */
	94
	95	/*
	96	* MS-DOS file system inode data in memory
	97	*/
	98	struct msdos_inode_info {
	99	spinlock_t cache_lru_lock;
	100	struct list_head cache_lru;
	101	int nr_caches;
	102	/* for avoiding the race between fat_free() and fat_get_cluster() */
	103	unsigned int cache_valid_id;
	104
2bdf67eb OH	105	/* NOTE: mmu_private is 64bits, so must hold ->i_mutex to access */
	106	loff_t mmu_private; /* physically allocated size */
	107
9e975dae OH	108	int i_start; /* first cluster or 0 */
	109	int i_logstart; /* logical first cluster */
	110	int i_attrs; /* unused attribute bits */
	111	loff_t i_pos; /* on-disk position of directory entry or 0 */
	112	struct hlist_node i_fat_hash; /* hash by i_location */
58268691	113	struct rw_semaphore truncate_lock; /* protect bmap against truncate */
9e975dae OH	114	struct inode vfs_inode;
	115	};
	116
	117	struct fat_slot_info {
	118	loff_t i_pos; /* on-disk position of directory entry */
	119	loff_t slot_off; /* offset for slot or de start */
	120	int nr_slots; /* number of slots + 1(de) in filename */
	121	struct msdos_dir_entry *de;
	122	struct buffer_head *bh;
	123	};
	124
	125	static inline struct msdos_sb_info MSDOS_SB(struct super_block sb)
	126	{
	127	return sb->s_fs_info;
	128	}
	129
	130	static inline struct msdos_inode_info MSDOS_I(struct inode inode)
	131	{
	132	return container_of(inode, struct msdos_inode_info, vfs_inode);
	133	}
	134
9183482f OH	135	/*
	136	* If ->i_mode can't hold S_IWUGO (i.e. ATTR_RO), we use ->i_attrs to
	137	* save ATTR_RO instead of ->i_mode.
dfc209c0 OH	138	*
	139	* If it's directory and !sbi->options.rodir, ATTR_RO isn't read-only
	140	* bit, it's just used as flag for app.
9183482f OH	141	*/
	142	static inline int fat_mode_can_hold_ro(struct inode *inode)
	143	{
	144	struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb);
dacd0e7b	145	umode_t mask;
9183482f	146
dfc209c0 OH	147	if (S_ISDIR(inode->i_mode)) {
	148	if (!sbi->options.rodir)
	149	return 0;
9183482f	150	mask = ~sbi->options.fs_dmask;
dfc209c0	151	} else
9183482f OH	152	mask = ~sbi->options.fs_fmask;
	153
	154	if (!(mask & S_IWUGO))
	155	return 0;
	156	return 1;
	157	}
	158
9c0aa1b8	159	/* Convert attribute bits and a mask to the UNIX mode. */
dacd0e7b AV	160	static inline umode_t fat_make_mode(struct msdos_sb_info *sbi,
dacd0e7b AV	161	u8 attrs, umode_t mode)
9c0aa1b8	162	{
dfc209c0	163	if (attrs & ATTR_RO && !((attrs & ATTR_DIR) && !sbi->options.rodir))
9c0aa1b8 OH	164	mode &= ~S_IWUGO;
	165
	166	if (attrs & ATTR_DIR)
	167	return (mode & ~sbi->options.fs_dmask) \| S_IFDIR;
	168	else
	169	return (mode & ~sbi->options.fs_fmask) \| S_IFREG;
	170	}
	171
9e975dae	172	/* Return the FAT attribute byte for this inode */
9c0aa1b8	173	static inline u8 fat_make_attrs(struct inode *inode)
9e975dae	174	{
9183482f OH	175	u8 attrs = MSDOS_I(inode)->i_attrs;
	176	if (S_ISDIR(inode->i_mode))
	177	attrs \|= ATTR_DIR;
	178	if (fat_mode_can_hold_ro(inode) && !(inode->i_mode & S_IWUGO))
	179	attrs \|= ATTR_RO;
	180	return attrs;
9e975dae OH	181	}
9e975dae OH	182
9c0aa1b8 OH	183	static inline void fat_save_attrs(struct inode *inode, u8 attrs)
9c0aa1b8 OH	184	{
9183482f OH	185	if (fat_mode_can_hold_ro(inode))
	186	MSDOS_I(inode)->i_attrs = attrs & ATTR_UNUSED;
	187	else
	188	MSDOS_I(inode)->i_attrs = attrs & (ATTR_UNUSED \| ATTR_RO);
9c0aa1b8 OH	189	}
9c0aa1b8 OH	190
9e975dae OH	191	static inline unsigned char fat_checksum(const __u8 *name)
	192	{
	193	unsigned char s = name[0];
	194	s = (s<<7) + (s>>1) + name[1]; s = (s<<7) + (s>>1) + name[2];
	195	s = (s<<7) + (s>>1) + name[3]; s = (s<<7) + (s>>1) + name[4];
	196	s = (s<<7) + (s>>1) + name[5]; s = (s<<7) + (s>>1) + name[6];
	197	s = (s<<7) + (s>>1) + name[7]; s = (s<<7) + (s>>1) + name[8];
	198	s = (s<<7) + (s>>1) + name[9]; s = (s<<7) + (s>>1) + name[10];
	199	return s;
	200	}
	201
	202	static inline sector_t fat_clus_to_blknr(struct msdos_sb_info *sbi, int clus)
	203	{
	204	return ((sector_t)clus - FAT_START_ENT) * sbi->sec_per_clus
	205	+ sbi->data_start;
	206	}
	207
	208	static inline void fat16_towchar(wchar_t dst, const __u8 src, size_t len)
	209	{
	210	#ifdef __BIG_ENDIAN
	211	while (len--) {
	212	*dst++ = src[0] \| (src[1] << 8);
	213	src += 2;
	214	}
	215	#else
	216	memcpy(dst, src, len * 2);
	217	#endif
	218	}
	219
	220	static inline void fatwchar_to16(__u8 dst, const wchar_t src, size_t len)
	221	{
	222	#ifdef __BIG_ENDIAN
	223	while (len--) {
	224	dst[0] = *src & 0x00FF;
	225	dst[1] = (*src & 0xFF00) >> 8;
	226	dst += 2;
	227	src++;
	228	}
	229	#else
	230	memcpy(dst, src, len * 2);
	231	#endif
	232	}
	233
	234	/* fat/cache.c */
	235	extern void fat_cache_inval_inode(struct inode *inode);
	236	extern int fat_get_cluster(struct inode *inode, int cluster,
	237	int fclus, int dclus);
	238	extern int fat_bmap(struct inode inode, sector_t sector, sector_t phys,
2bdf67eb	239	unsigned long *mapped_blocks, int create);
9e975dae OH	240
	241	/* fat/dir.c */
	242	extern const struct file_operations fat_dir_operations;
	243	extern int fat_search_long(struct inode inode, const unsigned char name,
	244	int name_len, struct fat_slot_info *sinfo);
	245	extern int fat_dir_empty(struct inode *dir);
	246	extern int fat_subdirs(struct inode *dir);
	247	extern int fat_scan(struct inode dir, const unsigned char name,
	248	struct fat_slot_info *sinfo);
	249	extern int fat_get_dotdot_entry(struct inode dir, struct buffer_head *bh,
	250	struct msdos_dir_entry *de, loff_t i_pos);
	251	extern int fat_alloc_new_dir(struct inode dir, struct timespec ts);
	252	extern int fat_add_entries(struct inode dir, void slots, int nr_slots,
	253	struct fat_slot_info *sinfo);
	254	extern int fat_remove_entries(struct inode dir, struct fat_slot_info sinfo);
	255
	256	/* fat/fatent.c */
	257	struct fat_entry {
	258	int entry;
	259	union {
	260	u8 *ent12_p[2];
	261	__le16 *ent16_p;
	262	__le32 *ent32_p;
	263	} u;
	264	int nr_bhs;
	265	struct buffer_head *bhs[2];
b522412a	266	struct inode *fat_inode;
9e975dae OH	267	};
	268
	269	static inline void fatent_init(struct fat_entry *fatent)
	270	{
	271	fatent->nr_bhs = 0;
	272	fatent->entry = 0;
	273	fatent->u.ent32_p = NULL;
	274	fatent->bhs[0] = fatent->bhs[1] = NULL;
b522412a	275	fatent->fat_inode = NULL;
9e975dae OH	276	}
	277
	278	static inline void fatent_set_entry(struct fat_entry *fatent, int entry)
	279	{
	280	fatent->entry = entry;
	281	fatent->u.ent32_p = NULL;
	282	}
	283
	284	static inline void fatent_brelse(struct fat_entry *fatent)
	285	{
	286	int i;
	287	fatent->u.ent32_p = NULL;
	288	for (i = 0; i < fatent->nr_bhs; i++)
	289	brelse(fatent->bhs[i]);
	290	fatent->nr_bhs = 0;
	291	fatent->bhs[0] = fatent->bhs[1] = NULL;
b522412a	292	fatent->fat_inode = NULL;
9e975dae OH	293	}
	294
	295	extern void fat_ent_access_init(struct super_block *sb);
	296	extern int fat_ent_read(struct inode inode, struct fat_entry fatent,
	297	int entry);
	298	extern int fat_ent_write(struct inode inode, struct fat_entry fatent,
	299	int new, int wait);
	300	extern int fat_alloc_clusters(struct inode inode, int cluster,
	301	int nr_cluster);
	302	extern int fat_free_clusters(struct inode *inode, int cluster);
	303	extern int fat_count_free_clusters(struct super_block *sb);
	304
	305	/* fat/file.c */
7845bc3e AB	306	extern long fat_generic_ioctl(struct file *filp, unsigned int cmd,
7845bc3e AB	307	unsigned long arg);
9e975dae OH	308	extern const struct file_operations fat_file_operations;
	309	extern const struct inode_operations fat_file_inode_operations;
	310	extern int fat_setattr(struct dentry * dentry, struct iattr * attr);
459f6ed3	311	extern void fat_truncate_blocks(struct inode *inode, loff_t offset);
9e975dae OH	312	extern int fat_getattr(struct vfsmount mnt, struct dentry dentry,
9e975dae OH	313	struct kstat *stat);
02c24a82 JB	314	extern int fat_file_fsync(struct file *file, loff_t start, loff_t end,
02c24a82 JB	315	int datasync);
9e975dae OH	316
	317	/* fat/inode.c */
	318	extern void fat_attach(struct inode *inode, loff_t i_pos);
	319	extern void fat_detach(struct inode *inode);
	320	extern struct inode fat_iget(struct super_block sb, loff_t i_pos);
	321	extern struct inode fat_build_inode(struct super_block sb,
	322	struct msdos_dir_entry *de, loff_t i_pos);
	323	extern int fat_sync_inode(struct inode *inode);
	324	extern int fat_fill_super(struct super_block sb, void data, int silent,
384f5c96	325	int isvfat, void (setup)(struct super_block ));
9e975dae OH	326
	327	extern int fat_flush_inodes(struct super_block sb, struct inode i1,
	328	struct inode *i2);
	329	/* fat/misc.c */
b9075fa9 JP	330	extern __printf(3, 4) __cold
b9075fa9 JP	331	void __fat_fs_error(struct super_block sb, int report, const char fmt, ...);
2c8a5ffb AF	332	#define fat_fs_error(sb, fmt, args...) \
	333	__fat_fs_error(sb, 1, fmt , ## args)
	334	#define fat_fs_error_ratelimit(sb, fmt, args...) \
	335	__fat_fs_error(sb, __ratelimit(&MSDOS_SB(sb)->ratelimit), fmt , ## args)
b9075fa9 JP	336	__printf(3, 4) __cold
b9075fa9 JP	337	void fat_msg(struct super_block sb, const char level, const char *fmt, ...);
ed248b29	338	extern int fat_clusters_flush(struct super_block *sb);
9e975dae	339	extern int fat_chain_add(struct inode *inode, int new_dclus, int nr_cluster);
7decd1cb OH	340	extern void fat_time_fat2unix(struct msdos_sb_info sbi, struct timespec ts,
	341	__le16 __time, __le16 __date, u8 time_cs);
	342	extern void fat_time_unix2fat(struct msdos_sb_info sbi, struct timespec ts,
	343	__le16 time, __le16 date, u8 *time_cs);
9e975dae OH	344	extern int fat_sync_bhs(struct buffer_head **bhs, int nr_bhs);
	345
	346	int fat_cache_init(void);
	347	void fat_cache_destroy(void);
	348
c3302931 OH	349	/* helper for printk */
	350	typedef unsigned long long llu;
	351
9e975dae	352	#endif /* !_FAT_H */