#define SECTOR_SIZE    512        /* sector size (bytes) */decltype
#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 */
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#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)
#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 */
html5中float用法#define MSDOS_DOT    ".          "    /* ".", padded to MSDOS_NAME chars */
#define MSDOS_DOTDOT    "..        "    /* "..", padded to MSDOS_NAME chars */
#define FAT_FIRST_ENT(s, x)    ((MSDOS_SB(s)->fat_bits == 32 ? 0x0FFFFF00 : \
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    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)
struct __fat_dirent {
    long        d_ino;
    __kernel_off_t        d_off;
    unsigned short    d_reclen;
    char        d_name[256]; /* We must not include limits.h! */
};
/* ioctl commands */
#define VFAT_IOCTL_READDIR_BOTH        _IOR('r', 1, struct __fat_dirent[2])
#define VFAT_IOCTL_READDIR_SHORT        _IOR('r', 2, struct __fat_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)
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 */linux建立文件系统的命令
    __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 */
嵌入式项目外包    __le32  reserved1[120];    /* Nothing as far as I can tell */

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