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#ifndef _LINUX_MSDOS_FS_H
#define _LINUX_MSDOS_FS_H

/*
 * The MS-DOS filesystem constants/structures
 */

#include <linux/buffer_head.h>
#include <linux/string.h>
#include <asm/byteorder.h>

struct statfs;


#define SECTOR_SIZE     512             /* sector size (bytes) */
#define SECTOR_BITS     9               /* log2(SECTOR_SIZE) */
#define MSDOS_DPB       (MSDOS_DPS)     /* dir entries per block */
#define MSDOS_DPB_BITS  4               /* log2(MSDOS_DPB) */
#define MSDOS_DPS       (SECTOR_SIZE / sizeof(struct msdos_dir_entry))
#define MSDOS_DPS_BITS  4               /* log2(MSDOS_DPS) */

#define MSDOS_ROOT_INO  1       /* == MINIX_ROOT_INO */
#define MSDOS_DIR_BITS  5       /* log2(sizeof(struct msdos_dir_entry)) */

/* directory limit */
#define FAT_MAX_DIR_ENTRIES     (65536)
#define FAT_MAX_DIR_SIZE        (FAT_MAX_DIR_ENTRIES << MSDOS_DIR_BITS)

#define MSDOS_SUPER_MAGIC 0x4d44 /* MD */

#define ATTR_NONE    0 /* no attribute bits */
#define ATTR_RO      1  /* read-only */
#define ATTR_HIDDEN  2  /* hidden */
#define ATTR_SYS     4  /* system */
#define ATTR_VOLUME  8  /* volume label */
#define ATTR_DIR     16 /* directory */
#define ATTR_ARCH    32 /* archived */

#define ATTR_UNUSED  (ATTR_VOLUME | ATTR_ARCH | ATTR_SYS | ATTR_HIDDEN)
        /* attribute bits that are copied "as is" */
#define ATTR_EXT     (ATTR_RO | ATTR_HIDDEN | ATTR_SYS | ATTR_VOLUME)
        /* bits that are used by the Windows 95/Windows NT extended FAT */

#define CASE_LOWER_BASE 8       /* base is lower case */
#define CASE_LOWER_EXT  16      /* extension is lower case */

#define DELETED_FLAG 0xe5 /* marks file as deleted when in name[0] */
#define IS_FREE(n) (!*(n) || *(n) == DELETED_FLAG)

#define MSDOS_VALID_MODE (S_IFREG | S_IFDIR | S_IRWXU | S_IRWXG | S_IRWXO)
        /* valid file mode bits */

#define MSDOS_NAME 11 /* maximum name length */
#define MSDOS_LONGNAME 256 /* maximum name length */
#define MSDOS_SLOTS 21  /* max # of slots needed for short and long names */
#define MSDOS_DOT    ".          " /* ".", padded to MSDOS_NAME chars */
#define MSDOS_DOTDOT "..         " /* "..", padded to MSDOS_NAME chars */

#define MSDOS_FAT12 4084 /* maximum number of clusters in a 12 bit FAT */

/* media of boot sector */
#define FAT_VALID_MEDIA(x)      ((0xF8 <= (x) && (x) <= 0xFF) || (x) == 0xF0)
#define FAT_FIRST_ENT(s, x)     ((MSDOS_SB(s)->fat_bits == 32 ? 0x0FFFFF00 : \
        MSDOS_SB(s)->fat_bits == 16 ? 0xFF00 : 0xF00) | (x))


/* bad cluster mark */
#define BAD_FAT12 0xFF7
#define BAD_FAT16 0xFFF7
#define BAD_FAT32 0xFFFFFF7
#define BAD_FAT(s) (MSDOS_SB(s)->fat_bits == 32 ? BAD_FAT32 : \
        MSDOS_SB(s)->fat_bits == 16 ? BAD_FAT16 : BAD_FAT12)


/* standard EOF */
#define EOF_FAT12 0xFFF
#define EOF_FAT16 0xFFFF
#define EOF_FAT32 0xFFFFFFF
#define EOF_FAT(s) (MSDOS_SB(s)->fat_bits == 32 ? EOF_FAT32 : \
        MSDOS_SB(s)->fat_bits == 16 ? EOF_FAT16 : EOF_FAT12)


#define FAT_ENT_FREE    (0)
#define FAT_ENT_BAD     (BAD_FAT32)
#define FAT_ENT_EOF     (EOF_FAT32)

#define FAT_FSINFO_SIG1         0x41615252
#define FAT_FSINFO_SIG2         0x61417272
#define IS_FSINFO(x)    (CF_LE_L((x)->signature1) == FAT_FSINFO_SIG1    \
                         && CF_LE_L((x)->signature2) == FAT_FSINFO_SIG2)


/*
 * ioctl commands
 */

#define VFAT_IOCTL_READDIR_BOTH         _IOR('r', 1, struct dirent [2])
#define VFAT_IOCTL_READDIR_SHORT        _IOR('r', 2, struct dirent [2])

/*
 * 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 */

/*
 * Conversion from and to little-endian byte order. (no-op on i386/i486)
 *
 * Naming: Ca_b_c, where a: F = from, T = to, b: LE = little-endian,
 * BE = big-endian, c: W = word (16 bits), L = longword (32 bits)
 */


#define CF_LE_W(v) le16_to_cpu(v)
#define CF_LE_L(v) le32_to_cpu(v)
#define CT_LE_W(v) cpu_to_le16(v)
#define CT_LE_L(v) cpu_to_le32(v)

struct fat_boot_sector {
        __u8    ignored[3];     /* Boot strap short or near jump */
        __u8    system_id[8];   /* Name - can be used to special case
                                   partition manager volumes */

        __u8    sector_size[2]; /* bytes per logical sector */
        __u8    sec_per_clus;   /* sectors/cluster */
        __u16   reserved;       /* reserved sectors */
        __u8    fats;           /* number of FATs */
        __u8    dir_entries[2]; /* root directory entries */
        __u8    sectors[2];     /* number of sectors */
        __u8    media;          /* media code */
        __u16   fat_length;     /* sectors/FAT */
        __u16   secs_track;     /* sectors per track */
        __u16   heads;          /* number of heads */
        __u32   hidden;         /* hidden sectors (unused) */
        __u32   total_sect;     /* number of sectors (if sectors == 0) */

        /* The following fields are only used by FAT32 */
        __u32   fat32_length;   /* sectors/FAT */
        __u16   flags;          /* bit 8: fat mirroring, low 4: active fat */
        __u8    version[2];     /* major, minor filesystem version */
        __u32   root_cluster;   /* first cluster in root directory */
        __u16   info_sector;    /* filesystem info sector */
        __u16   backup_boot;    /* backup boot sector */
        __u16   reserved2[6];   /* Unused */
};

struct fat_boot_fsinfo {
        __u32   signature1;     /* 0x41615252L */
        __u32   reserved1[120]; /* Nothing as far as I can tell */
        __u32   signature2;     /* 0x61417272L */
        __u32   free_clusters;  /* Free cluster count.  -1 if unknown */
        __u32   next_cluster;   /* Most recently allocated cluster */
        __u32   reserved2[4];
};

struct msdos_dir_entry {
        __u8    name[8],ext[3]; /* name and extension */
        __u8    attr;           /* attribute bits */
        __u8    lcase;          /* Case for base and extension */
        __u8    ctime_ms;       /* Creation time, milliseconds */
        __u16   ctime;          /* Creation time */
        __u16   cdate;          /* Creation date */
        __u16   adate;          /* Last access date */
        __u16   starthi;        /* High 16 bits of cluster in FAT32 */
        __u16   time,date,start;/* time, date and first cluster */
        __u32   size;           /* file size (in bytes) */
};

/* Up to 13 characters of the name */
struct msdos_dir_slot {
        __u8    id;             /* sequence number for slot */
        __u8    name0_4[10];    /* first 5 characters in name */
        __u8    attr;           /* attribute byte */
        __u8    reserved;       /* always 0 */
        __u8    alias_checksum; /* checksum for 8.3 alias */
        __u8    name5_10[12];   /* 6 more characters in name */
        __u16   start;          /* starting cluster number, 0 in long slots */
        __u8    name11_12[4];   /* last 2 characters in name */
};

struct vfat_slot_info {
        int long_slots;                /* number of long slots in filename */
        loff_t longname_offset;        /* dir offset for longname start */
        loff_t i_pos;                  /* on-disk position of directory entry */
};

/* Convert attribute bits and a mask to the UNIX mode. */
#define MSDOS_MKMODE(a,m) (m & (a & ATTR_RO ? S_IRUGO|S_IXUGO : S_IRWXUGO))

/* Convert the UNIX mode to MS-DOS attribute bits. */
#define MSDOS_MKATTR(m) ((m & S_IWUGO) ? ATTR_NONE : ATTR_RO)


#ifdef __KERNEL__

#include <linux/nls.h>
#include <linux/msdos_fs_i.h>
#include <linux/msdos_fs_sb.h>

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);
}

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 int fat_access(struct super_block *sb, int nr, int new_value);
extern int __fat_access(struct super_block *sb, int nr, int new_value);
extern int fat_bmap(struct inode *inode, sector_t sector, sector_t *phys);
extern void fat_cache_init(struct super_block *sb);
extern void fat_cache_lookup(struct inode *inode, int cluster, int *f_clu,
                             int *d_clu);
extern void fat_cache_add(struct inode *inode, int f_clu, int d_clu);
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_free(struct inode *inode, int skip);

/* fat/dir.c */
extern struct file_operations fat_dir_operations;
extern int fat_search_long(struct inode *inode, const unsigned char *name,
                           int name_len, int anycase,
                           loff_t *spos, loff_t *lpos);
extern int fat_readdir(struct file *filp, void *dirent, filldir_t filldir);
extern int fat_dir_ioctl(struct inode * inode, struct file * filp,
                         unsigned int cmd, unsigned long arg);
extern int fat_add_entries(struct inode *dir, int slots, struct buffer_head **bh,
                        struct msdos_dir_entry **de, loff_t *i_pos);
extern int fat_new_dir(struct inode *dir, struct inode *parent, int is_vfat);
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 buffer_head **res_bh,
                    struct msdos_dir_entry **res_de, loff_t *i_pos);

/* fat/file.c */
extern struct file_operations fat_file_operations;
extern struct inode_operations fat_file_inode_operations;
extern int fat_get_block(struct inode *inode, sector_t iblock,
                         struct buffer_head *bh_result, int create);
extern void fat_truncate(struct inode *inode);

/* fat/inode.c */
extern void fat_hash_init(void);
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, int *res);
extern void fat_delete_inode(struct inode *inode);
extern void fat_clear_inode(struct inode *inode);
extern void fat_put_super(struct super_block *sb);
int fat_fill_super(struct super_block *sb, void *data, int silent,
                   struct inode_operations *fs_dir_inode_ops, int isvfat);
extern int fat_statfs(struct super_block *sb, struct kstatfs *buf);
extern void fat_write_inode(struct inode *inode, int wait);
extern int fat_notify_change(struct dentry * dentry, struct iattr * attr);

/* fat/misc.c */
extern void fat_fs_panic(struct super_block *s, const char *fmt, ...);
extern void lock_fat(struct super_block *sb);
extern void unlock_fat(struct super_block *sb);
extern void fat_clusters_flush(struct super_block *sb);
extern int fat_add_cluster(struct inode *inode);
extern struct buffer_head *fat_extend_dir(struct inode *inode);
extern int date_dos2unix(unsigned short time, unsigned short date);
extern void fat_date_unix2dos(int unix_date, unsigned short *time,
                              unsigned short *date);
extern int fat__get_entry(struct inode *dir, loff_t *pos,
                          struct buffer_head **bh,
                          struct msdos_dir_entry **de, loff_t *i_pos);
static __inline__ int fat_get_entry(struct inode *dir, loff_t *pos,
                                    struct buffer_head **bh,
                                    struct msdos_dir_entry **de, loff_t *i_pos)
{
        /* Fast stuff first */
        if (*bh && *de &&
            (*de - (struct msdos_dir_entry *)(*bh)->b_data) < MSDOS_SB(dir->i_sb)->dir_per_block - 1) {
                *pos += sizeof(struct msdos_dir_entry);
                (*de)++;
                (*i_pos)++;
                return 0;
        }
        return fat__get_entry(dir, pos, bh, de, i_pos);
}

/* msdos/namei.c  - these are for Umsdos */
extern struct dentry *msdos_lookup(struct inode *dir, struct dentry *, struct nameidata *);
extern int msdos_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *);
extern int msdos_rmdir(struct inode *dir, struct dentry *dentry);
extern int msdos_mkdir(struct inode *dir, struct dentry *dentry, int mode);
extern int msdos_unlink(struct inode *dir, struct dentry *dentry);
extern int msdos_rename(struct inode *old_dir, struct dentry *old_dentry,
                        struct inode *new_dir, struct dentry *new_dentry);
extern int msdos_fill_super(struct super_block *sb, void *data, int silent);

/* vfat/namei.c - these are for dmsdos */
extern struct dentry *vfat_lookup(struct inode *dir, struct dentry *, struct nameidata *);
extern int vfat_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *);
extern int vfat_rmdir(struct inode *dir, struct dentry *dentry);
extern int vfat_unlink(struct inode *dir, struct dentry *dentry);
extern int vfat_mkdir(struct inode *dir, struct dentry *dentry, int mode);
extern int vfat_rename(struct inode *old_dir, struct dentry *old_dentry,
                       struct inode *new_dir, struct dentry *new_dentry);
extern int vfat_fill_super(struct super_block *sb, void *data, int silent);

/* vfat/vfatfs_syms.c */
extern struct file_system_type vfat_fs_type;

#endif /* __KERNEL__ */

#endif