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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