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#ifndef _LINUX_MSDOS_FS_H

#define _LINUX_MSDOS_FS_H

#include <linux/magic.h>

/*

 * The MS-DOS filesystem constants/structures

 */

#include <asm/byteorder.h>

#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 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)

#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 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 */

/* attribute bits that are copied "as is" */

#define ATTR_UNUSED     (ATTR_VOLUME | ATTR_ARCH | ATTR_SYS | ATTR_HIDDEN)

/* bits that are used by the Windows 95/Windows NT extended FAT */

#define ATTR_EXT        (ATTR_RO | ATTR_HIDDEN | ATTR_SYS | ATTR_VOLUME)

#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)

/* valid file mode bits */

#define MSDOS_VALID_MODE (S_IFREG | S_IFDIR | S_IRWXU | S_IRWXG | S_IRWXO)

/* 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))

#define MSDOS_NAME      11      /* maximum name length */

#define MSDOS_LONGNAME  256     /* maximum name length */

#define MSDOS_SLOTS     21      /* max # of slots for short and long names */

#define MSDOS_DOT       ".          "   /* ".", padded to MSDOS_NAME chars */

#define MSDOS_DOTDOT    "..         "   /* "..", padded to MSDOS_NAME chars */

/* 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))

/* start of data cluster's entry (number of reserved clusters) */

#define FAT_START_ENT   2

/* maximum number of clusters */

#define MAX_FAT12       0xFF4

#define MAX_FAT16       0xFFF4

#define MAX_FAT32       0x0FFFFFF6

#define MAX_FAT(s)      (MSDOS_SB(s)->fat_bits == 32 ? MAX_FAT32 : \

        MSDOS_SB(s)->fat_bits == 16 ? MAX_FAT16 : MAX_FAT12)

/* bad cluster mark */

#define BAD_FAT12       0xFF7

#define BAD_FAT16       0xFFF7

#define BAD_FAT32       0x0FFFFFF7

/* standard EOF */

#define EOF_FAT12       0xFFF

#define EOF_FAT16       0xFFFF

#define EOF_FAT32       0x0FFFFFFF

#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)    (le32_to_cpu((x)->signature1) == FAT_FSINFO_SIG1 \

                         && le32_to_cpu((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])

/* <linux/videotext.h> has used 0x72 ('r') in collision, so skip a few */

#define FAT_IOCTL_GET_ATTRIBUTES        _IOR('r', 0x10, __u32)

#define FAT_IOCTL_SET_ATTRIBUTES        _IOW('r', 0x11, __u32)

/*

 * 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 */

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 */

        __le16  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 */

        __le16  fat_length;     /* sectors/FAT */

        __le16  secs_track;     /* sectors per track */

        __le16  heads;          /* number of heads */

        __le32  hidden;         /* hidden sectors (unused) */

        __le32  total_sect;     /* number of sectors (if sectors == 0) */

        /* The following fields are only used by FAT32 */

        __le32  fat32_length;   /* sectors/FAT */

        __le16  flags;          /* bit 8: fat mirroring, low 4: active fat */

        __u8    version[2];     /* major, minor filesystem version */

        __le32  root_cluster;   /* first cluster in root directory */

        __le16  info_sector;    /* filesystem info sector */

        __le16  backup_boot;    /* backup boot sector */

        __le16  reserved2[6];   /* Unused */

};

struct fat_boot_fsinfo {

        __le32   signature1;    /* 0x41615252L */

        __le32   reserved1[120];        /* Nothing as far as I can tell */

        __le32   signature2;    /* 0x61417272L */

        __le32   free_clusters; /* Free cluster count.  -1 if unknown */

        __le32   next_cluster;  /* Most recently allocated cluster */

        __le32   reserved2[4];

};

struct msdos_dir_entry {

        __u8    name[MSDOS_NAME];/* name and extension */

        __u8    attr;           /* attribute bits */

        __u8    lcase;          /* Case for base and extension */

        __u8    ctime_cs;       /* Creation time, centiseconds (0-199) */

        __le16  ctime;          /* Creation time */

        __le16  cdate;          /* Creation date */

        __le16  adate;          /* Last access date */

        __le16  starthi;        /* High 16 bits of cluster in FAT32 */

        __le16  time,date,start;/* time, date and first cluster */

        __le32  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 */

        __le16   start;         /* starting cluster number, 0 in long slots */

        __u8    name11_12[4];   /* last 2 characters in name */

};

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;

};

#ifdef __KERNEL__

#include <linux/buffer_head.h>

#include <linux/string.h>

#include <linux/nls.h>

#include <linux/fs.h>

#include <linux/mutex.h>

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 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? */

                 atari:1,         /* Use Atari GEMDOS variation of MS-DOS fs */

                 flush:1,         /* write things quickly */

                 nocase:1,        /* Does this need case conversion? 0=need case conversion*/

                 usefree:1;       /* Use free_clusters for FAT32 */

};

#define FAT_HASH_BITS   8

#define FAT_HASH_SIZE   (1UL << FAT_HASH_BITS)

#define FAT_HASH_MASK   (FAT_HASH_SIZE-1)

/*

 * 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 */

        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;

        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;

        loff_t mmu_private;

        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;

};

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);

}

/* Return the FAT attribute byte for this inode */

static inline u8 fat_attr(struct inode *inode)

{

        return ((inode->i_mode & S_IWUGO) ? ATTR_NONE : ATTR_RO) |

                (S_ISDIR(inode->i_mode) ? ATTR_DIR : ATTR_NONE) |

                MSDOS_I(inode)->i_attrs;

}

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);

/* 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];

};

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;

}

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;

}

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_notify_change(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);

/* 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_panic(struct super_block *s, const char *fmt, ...);

extern void fat_clusters_flush(struct super_block *sb);

extern int fat_chain_add(struct inode *inode, int new_dclus, int nr_cluster);

extern int date_dos2unix(unsigned short time, unsigned short date);

extern void fat_date_unix2dos(int unix_date, __le16 *time, __le16 *date);

extern int fat_sync_bhs(struct buffer_head **bhs, int nr_bhs);

int fat_cache_init(void);

void fat_cache_destroy(void);

#endif /* __KERNEL__ */

#endif