[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/hash.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 {
	kuid_t fs_uid;
	kgid_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 */
		 nfs:1;		   /* Do extra work needed for NFS export */
};

#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];

	spinlock_t dir_hash_lock;
	struct hlist_head dir_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 hlist_node i_dir_hash;	/* hash by i_logstart */
	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 int fat_get_start(const struct msdos_sb_info *sbi,
				const struct msdos_dir_entry *de)
{
	int cluster = le16_to_cpu(de->start);
	if (sbi->fat_bits == 32)
		cluster |= (le16_to_cpu(de->starthi) << 16);
	return cluster;
}

static inline void fat_set_start(struct msdos_dir_entry *de, int cluster)
{
	de->start   = cpu_to_le16(cluster);
	de->starthi = cpu_to_le16(cluster >> 16);
}

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);
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);
static inline unsigned long fat_dir_hash(int logstart)
{
	return hash_32(logstart, FAT_HASH_BITS);
}

/* 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, ...);
#define fat_msg_ratelimit(sb, level, fmt, args...)	\
	do {	\
			if (__ratelimit(&MSDOS_SB(sb)->ratelimit))	\
				fat_msg(sb, level, fmt, ## args);	\
	 } while (0)
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);

/* fat/nfs.c */
struct fid;
extern struct dentry *fat_fh_to_dentry(struct super_block *sb, struct fid *fid,
				       int fh_len, int fh_type);
extern struct dentry *fat_fh_to_parent(struct super_block *sb, struct fid *fid,
				       int fh_len, int fh_type);
extern struct dentry *fat_get_parent(struct dentry *child_dir);

/* 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>
7669e8fb	8	#include <linux/hash.h>
9e975dae	9	#include <linux/mutex.h>
aaa04b48	10	#include <linux/ratelimit.h>
9e975dae OH	11	#include <linux/msdos_fs.h>
	12
	13	/*
	14	* vfat shortname flags
	15	*/
	16	#define VFAT_SFN_DISPLAY_LOWER 0x0001 /* convert to lowercase for display */
	17	#define VFAT_SFN_DISPLAY_WIN95 0x0002 /* emulate win95 rule for display */
	18	#define VFAT_SFN_DISPLAY_WINNT 0x0004 /* emulate winnt rule for display */
	19	#define VFAT_SFN_CREATE_WIN95 0x0100 /* emulate win95 rule for create */
	20	#define VFAT_SFN_CREATE_WINNT 0x0200 /* emulate winnt rule for create */
	21
85c78591 DK	22	#define FAT_ERRORS_CONT 1 /* ignore error and continue */
	23	#define FAT_ERRORS_PANIC 2 /* panic on error */
	24	#define FAT_ERRORS_RO 3 /* remount r/o on error */
	25
9e975dae	26	struct fat_mount_options {
170782eb EB	27	kuid_t fs_uid;
170782eb EB	28	kgid_t fs_gid;
9e975dae OH	29	unsigned short fs_fmask;
9e975dae OH	30	unsigned short fs_dmask;
4a3aeb13 CJB	31	unsigned short codepage; /* Codepage for shortname conversions */
	32	char iocharset; / Charset used for filename input/display */
	33	unsigned short shortname; /* flags for shortname display/create rule */
	34	unsigned char name_check; /* r = relaxed, n = normal, s = strict */
	35	unsigned char errors; /* On error: continue, panic, remount-ro */
9e975dae	36	unsigned short allow_utime;/* permission for setting the [am]time */
4a3aeb13 CJB	37	unsigned quiet:1, /* set = fake successful chmods and chowns */
	38	showexec:1, /* set = only set x bit for com/exe/bat */
	39	sys_immutable:1, /* set = system files are immutable */
	40	dotsOK:1, /* set = hidden and system files are named '.filename' */
	41	isvfat:1, /* 0=no vfat long filename support, 1=vfat support */
	42	utf8:1, /* Use of UTF-8 character set (Default) */
	43	unicode_xlate:1, /* create escape sequences for unhandled Unicode */
	44	numtail:1, /* Does first alias have a numeric '~1' type tail? */
	45	flush:1, /* write things quickly */
	46	nocase:1, /* Does this need case conversion? 0=need case conversion*/
	47	usefree:1, /* Use free_clusters for FAT32 */
	48	tz_utc:1, /* Filesystem timestamps are in UTC */
	49	rodir:1, /* allow ATTR_RO for directory */
	50	discard:1, /* Issue discard requests on deletions */
	51	nfs:1; /* Do extra work needed for NFS export */
9e975dae OH	52	};
	53
	54	#define FAT_HASH_BITS 8
	55	#define FAT_HASH_SIZE (1UL << FAT_HASH_BITS)
9e975dae OH	56
	57	/*
	58	* MS-DOS file system in-core superblock data
	59	*/
	60	struct msdos_sb_info {
4a3aeb13 CJB	61	unsigned short sec_per_clus; /* sectors/cluster */
	62	unsigned short cluster_bits; /* log2(cluster_size) */
	63	unsigned int cluster_size; /* cluster size */
d5a4a386	64	unsigned char fats, fat_bits; /* number of FATs, FAT bits (12 or 16) */
9e975dae	65	unsigned short fat_start;
4a3aeb13	66	unsigned long fat_length; /* FAT start & length (sec.) */
9e975dae	67	unsigned long dir_start;
4a3aeb13 CJB	68	unsigned short dir_entries; /* root dir start & entries */
	69	unsigned long data_start; /* first data sector */
	70	unsigned long max_cluster; /* maximum cluster number */
	71	unsigned long root_cluster; /* first cluster of the root directory */
	72	unsigned long fsinfo_sector; /* sector number of FAT32 fsinfo */
9e975dae	73	struct mutex fat_lock;
4a3aeb13 CJB	74	unsigned int prev_free; /* previously allocated cluster number */
4a3aeb13 CJB	75	unsigned int free_clusters; /* -1 if undefined */
9e975dae OH	76	unsigned int free_clus_valid; /* is free_clusters valid? */
9e975dae OH	77	struct fat_mount_options options;
4a3aeb13 CJB	78	struct nls_table nls_disk; / Codepage used on disk */
	79	struct nls_table nls_io; / Charset used for input and display */
	80	const void dir_ops; / Opaque; default directory operations */
	81	int dir_per_block; /* dir entries per block */
	82	int dir_per_block_bits; /* log2(dir_per_block) */
9e975dae OH	83
	84	int fatent_shift;
	85	struct fatent_operations *fatent_ops;
b522412a	86	struct inode *fat_inode;
020ac5b6	87	struct inode *fsinfo_inode;
9e975dae	88
aaa04b48 OH	89	struct ratelimit_state ratelimit;
aaa04b48 OH	90
9e975dae OH	91	spinlock_t inode_hash_lock;
9e975dae OH	92	struct hlist_head inode_hashtable[FAT_HASH_SIZE];
7669e8fb SM	93
	94	spinlock_t dir_hash_lock;
	95	struct hlist_head dir_hashtable[FAT_HASH_SIZE];
9e975dae OH	96	};
	97
	98	#define FAT_CACHE_VALID 0 /* special case for valid cache */
	99
	100	/*
	101	* MS-DOS file system inode data in memory
	102	*/
	103	struct msdos_inode_info {
	104	spinlock_t cache_lru_lock;
	105	struct list_head cache_lru;
	106	int nr_caches;
	107	/* for avoiding the race between fat_free() and fat_get_cluster() */
	108	unsigned int cache_valid_id;
	109
2bdf67eb OH	110	/* NOTE: mmu_private is 64bits, so must hold ->i_mutex to access */
	111	loff_t mmu_private; /* physically allocated size */
	112
9e975dae OH	113	int i_start; /* first cluster or 0 */
	114	int i_logstart; /* logical first cluster */
	115	int i_attrs; /* unused attribute bits */
	116	loff_t i_pos; /* on-disk position of directory entry or 0 */
	117	struct hlist_node i_fat_hash; /* hash by i_location */
7669e8fb	118	struct hlist_node i_dir_hash; /* hash by i_logstart */
58268691	119	struct rw_semaphore truncate_lock; /* protect bmap against truncate */
9e975dae OH	120	struct inode vfs_inode;
	121	};
	122
	123	struct fat_slot_info {
	124	loff_t i_pos; /* on-disk position of directory entry */
	125	loff_t slot_off; /* offset for slot or de start */
	126	int nr_slots; /* number of slots + 1(de) in filename */
	127	struct msdos_dir_entry *de;
	128	struct buffer_head *bh;
	129	};
	130
	131	static inline struct msdos_sb_info MSDOS_SB(struct super_block sb)
	132	{
	133	return sb->s_fs_info;
	134	}
	135
	136	static inline struct msdos_inode_info MSDOS_I(struct inode inode)
	137	{
	138	return container_of(inode, struct msdos_inode_info, vfs_inode);
	139	}
	140
9183482f OH	141	/*
	142	* If ->i_mode can't hold S_IWUGO (i.e. ATTR_RO), we use ->i_attrs to
	143	* save ATTR_RO instead of ->i_mode.
dfc209c0 OH	144	*
	145	* If it's directory and !sbi->options.rodir, ATTR_RO isn't read-only
	146	* bit, it's just used as flag for app.
9183482f OH	147	*/
	148	static inline int fat_mode_can_hold_ro(struct inode *inode)
	149	{
	150	struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb);
dacd0e7b	151	umode_t mask;
9183482f	152
dfc209c0 OH	153	if (S_ISDIR(inode->i_mode)) {
	154	if (!sbi->options.rodir)
	155	return 0;
9183482f	156	mask = ~sbi->options.fs_dmask;
dfc209c0	157	} else
9183482f OH	158	mask = ~sbi->options.fs_fmask;
	159
	160	if (!(mask & S_IWUGO))
	161	return 0;
	162	return 1;
	163	}
	164
9c0aa1b8	165	/* Convert attribute bits and a mask to the UNIX mode. */
dacd0e7b AV	166	static inline umode_t fat_make_mode(struct msdos_sb_info *sbi,
dacd0e7b AV	167	u8 attrs, umode_t mode)
9c0aa1b8	168	{
dfc209c0	169	if (attrs & ATTR_RO && !((attrs & ATTR_DIR) && !sbi->options.rodir))
9c0aa1b8 OH	170	mode &= ~S_IWUGO;
	171
	172	if (attrs & ATTR_DIR)
	173	return (mode & ~sbi->options.fs_dmask) \| S_IFDIR;
	174	else
	175	return (mode & ~sbi->options.fs_fmask) \| S_IFREG;
	176	}
	177
9e975dae	178	/* Return the FAT attribute byte for this inode */
9c0aa1b8	179	static inline u8 fat_make_attrs(struct inode *inode)
9e975dae	180	{
9183482f OH	181	u8 attrs = MSDOS_I(inode)->i_attrs;
	182	if (S_ISDIR(inode->i_mode))
	183	attrs \|= ATTR_DIR;
	184	if (fat_mode_can_hold_ro(inode) && !(inode->i_mode & S_IWUGO))
	185	attrs \|= ATTR_RO;
	186	return attrs;
9e975dae OH	187	}
9e975dae OH	188
9c0aa1b8 OH	189	static inline void fat_save_attrs(struct inode *inode, u8 attrs)
9c0aa1b8 OH	190	{
9183482f OH	191	if (fat_mode_can_hold_ro(inode))
	192	MSDOS_I(inode)->i_attrs = attrs & ATTR_UNUSED;
	193	else
	194	MSDOS_I(inode)->i_attrs = attrs & (ATTR_UNUSED \| ATTR_RO);
9c0aa1b8 OH	195	}
9c0aa1b8 OH	196
9e975dae OH	197	static inline unsigned char fat_checksum(const __u8 *name)
	198	{
	199	unsigned char s = name[0];
	200	s = (s<<7) + (s>>1) + name[1]; s = (s<<7) + (s>>1) + name[2];
	201	s = (s<<7) + (s>>1) + name[3]; s = (s<<7) + (s>>1) + name[4];
	202	s = (s<<7) + (s>>1) + name[5]; s = (s<<7) + (s>>1) + name[6];
	203	s = (s<<7) + (s>>1) + name[7]; s = (s<<7) + (s>>1) + name[8];
	204	s = (s<<7) + (s>>1) + name[9]; s = (s<<7) + (s>>1) + name[10];
	205	return s;
	206	}
	207
	208	static inline sector_t fat_clus_to_blknr(struct msdos_sb_info *sbi, int clus)
	209	{
	210	return ((sector_t)clus - FAT_START_ENT) * sbi->sec_per_clus
	211	+ sbi->data_start;
	212	}
	213
	214	static inline void fat16_towchar(wchar_t dst, const __u8 src, size_t len)
	215	{
	216	#ifdef __BIG_ENDIAN
	217	while (len--) {
	218	*dst++ = src[0] \| (src[1] << 8);
	219	src += 2;
	220	}
	221	#else
	222	memcpy(dst, src, len * 2);
	223	#endif
	224	}
	225
a943ed71 SM	226	static inline int fat_get_start(const struct msdos_sb_info *sbi,
	227	const struct msdos_dir_entry *de)
	228	{
	229	int cluster = le16_to_cpu(de->start);
	230	if (sbi->fat_bits == 32)
	231	cluster \|= (le16_to_cpu(de->starthi) << 16);
	232	return cluster;
	233	}
	234
	235	static inline void fat_set_start(struct msdos_dir_entry *de, int cluster)
	236	{
	237	de->start = cpu_to_le16(cluster);
	238	de->starthi = cpu_to_le16(cluster >> 16);
	239	}
	240
9e975dae OH	241	static inline void fatwchar_to16(__u8 dst, const wchar_t src, size_t len)
	242	{
	243	#ifdef __BIG_ENDIAN
	244	while (len--) {
	245	dst[0] = *src & 0x00FF;
	246	dst[1] = (*src & 0xFF00) >> 8;
	247	dst += 2;
	248	src++;
	249	}
	250	#else
	251	memcpy(dst, src, len * 2);
	252	#endif
	253	}
	254
	255	/* fat/cache.c */
	256	extern void fat_cache_inval_inode(struct inode *inode);
	257	extern int fat_get_cluster(struct inode *inode, int cluster,
	258	int fclus, int dclus);
	259	extern int fat_bmap(struct inode inode, sector_t sector, sector_t phys,
2bdf67eb	260	unsigned long *mapped_blocks, int create);
9e975dae OH	261
	262	/* fat/dir.c */
	263	extern const struct file_operations fat_dir_operations;
	264	extern int fat_search_long(struct inode inode, const unsigned char name,
	265	int name_len, struct fat_slot_info *sinfo);
	266	extern int fat_dir_empty(struct inode *dir);
	267	extern int fat_subdirs(struct inode *dir);
	268	extern int fat_scan(struct inode dir, const unsigned char name,
	269	struct fat_slot_info *sinfo);
	270	extern int fat_get_dotdot_entry(struct inode dir, struct buffer_head *bh,
7669e8fb	271	struct msdos_dir_entry **de);
9e975dae OH	272	extern int fat_alloc_new_dir(struct inode dir, struct timespec ts);
	273	extern int fat_add_entries(struct inode dir, void slots, int nr_slots,
	274	struct fat_slot_info *sinfo);
	275	extern int fat_remove_entries(struct inode dir, struct fat_slot_info sinfo);
	276
	277	/* fat/fatent.c */
	278	struct fat_entry {
	279	int entry;
	280	union {
	281	u8 *ent12_p[2];
	282	__le16 *ent16_p;
	283	__le32 *ent32_p;
	284	} u;
	285	int nr_bhs;
	286	struct buffer_head *bhs[2];
b522412a	287	struct inode *fat_inode;
9e975dae OH	288	};
	289
	290	static inline void fatent_init(struct fat_entry *fatent)
	291	{
	292	fatent->nr_bhs = 0;
	293	fatent->entry = 0;
	294	fatent->u.ent32_p = NULL;
	295	fatent->bhs[0] = fatent->bhs[1] = NULL;
b522412a	296	fatent->fat_inode = NULL;
9e975dae OH	297	}
	298
	299	static inline void fatent_set_entry(struct fat_entry *fatent, int entry)
	300	{
	301	fatent->entry = entry;
	302	fatent->u.ent32_p = NULL;
	303	}
	304
	305	static inline void fatent_brelse(struct fat_entry *fatent)
	306	{
	307	int i;
	308	fatent->u.ent32_p = NULL;
	309	for (i = 0; i < fatent->nr_bhs; i++)
	310	brelse(fatent->bhs[i]);
	311	fatent->nr_bhs = 0;
	312	fatent->bhs[0] = fatent->bhs[1] = NULL;
b522412a	313	fatent->fat_inode = NULL;
9e975dae OH	314	}
	315
	316	extern void fat_ent_access_init(struct super_block *sb);
	317	extern int fat_ent_read(struct inode inode, struct fat_entry fatent,
	318	int entry);
	319	extern int fat_ent_write(struct inode inode, struct fat_entry fatent,
	320	int new, int wait);
	321	extern int fat_alloc_clusters(struct inode inode, int cluster,
	322	int nr_cluster);
	323	extern int fat_free_clusters(struct inode *inode, int cluster);
	324	extern int fat_count_free_clusters(struct super_block *sb);
	325
	326	/* fat/file.c */
7845bc3e AB	327	extern long fat_generic_ioctl(struct file *filp, unsigned int cmd,
7845bc3e AB	328	unsigned long arg);
9e975dae OH	329	extern const struct file_operations fat_file_operations;
9e975dae OH	330	extern const struct inode_operations fat_file_inode_operations;
d5a4a386	331	extern int fat_setattr(struct dentry dentry, struct iattr attr);
459f6ed3	332	extern void fat_truncate_blocks(struct inode *inode, loff_t offset);
9e975dae OH	333	extern int fat_getattr(struct vfsmount mnt, struct dentry dentry,
9e975dae OH	334	struct kstat *stat);
02c24a82 JB	335	extern int fat_file_fsync(struct file *file, loff_t start, loff_t end,
02c24a82 JB	336	int datasync);
9e975dae OH	337
	338	/* fat/inode.c */
	339	extern void fat_attach(struct inode *inode, loff_t i_pos);
	340	extern void fat_detach(struct inode *inode);
	341	extern struct inode fat_iget(struct super_block sb, loff_t i_pos);
	342	extern struct inode fat_build_inode(struct super_block sb,
	343	struct msdos_dir_entry *de, loff_t i_pos);
	344	extern int fat_sync_inode(struct inode *inode);
	345	extern int fat_fill_super(struct super_block sb, void data, int silent,
384f5c96	346	int isvfat, void (setup)(struct super_block ));
9e975dae OH	347
9e975dae OH	348	extern int fat_flush_inodes(struct super_block sb, struct inode i1,
d5a4a386	349	struct inode *i2);
7669e8fb	350	static inline unsigned long fat_dir_hash(int logstart)
21b6633d	351	{
7669e8fb	352	return hash_32(logstart, FAT_HASH_BITS);
21b6633d SM	353	}
21b6633d SM	354
9e975dae	355	/* fat/misc.c */
b9075fa9 JP	356	extern __printf(3, 4) __cold
b9075fa9 JP	357	void __fat_fs_error(struct super_block sb, int report, const char fmt, ...);
2c8a5ffb AF	358	#define fat_fs_error(sb, fmt, args...) \
	359	__fat_fs_error(sb, 1, fmt , ## args)
	360	#define fat_fs_error_ratelimit(sb, fmt, args...) \
	361	__fat_fs_error(sb, __ratelimit(&MSDOS_SB(sb)->ratelimit), fmt , ## args)
b9075fa9 JP	362	__printf(3, 4) __cold
b9075fa9 JP	363	void fat_msg(struct super_block sb, const char level, const char *fmt, ...);
b742c341 NJ	364	#define fat_msg_ratelimit(sb, level, fmt, args...) \
	365	do { \
	366	if (__ratelimit(&MSDOS_SB(sb)->ratelimit)) \
	367	fat_msg(sb, level, fmt, ## args); \
	368	} while (0)
ed248b29	369	extern int fat_clusters_flush(struct super_block *sb);
9e975dae	370	extern int fat_chain_add(struct inode *inode, int new_dclus, int nr_cluster);
7decd1cb OH	371	extern void fat_time_fat2unix(struct msdos_sb_info sbi, struct timespec ts,
	372	__le16 __time, __le16 __date, u8 time_cs);
	373	extern void fat_time_unix2fat(struct msdos_sb_info sbi, struct timespec ts,
	374	__le16 time, __le16 date, u8 *time_cs);
9e975dae OH	375	extern int fat_sync_bhs(struct buffer_head **bhs, int nr_bhs);
	376
	377	int fat_cache_init(void);
	378	void fat_cache_destroy(void);
	379
21b6633d SM	380	/* fat/nfs.c */
21b6633d SM	381	struct fid;
21b6633d SM	382	extern struct dentry fat_fh_to_dentry(struct super_block sb, struct fid *fid,
21b6633d SM	383	int fh_len, int fh_type);
7669e8fb SM	384	extern struct dentry fat_fh_to_parent(struct super_block sb, struct fid *fid,
7669e8fb SM	385	int fh_len, int fh_type);
21b6633d SM	386	extern struct dentry fat_get_parent(struct dentry child_dir);
21b6633d SM	387
c3302931 OH	388	/* helper for printk */
	389	typedef unsigned long long llu;
	390
9e975dae	391	#endif /* !_FAT_H */