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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 422 | giacomo | 1 | #ifndef _LINUX_MSDOS_FS_H |
| 2 | #define _LINUX_MSDOS_FS_H |
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| 3 | |||
| 4 | /* |
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| 5 | * The MS-DOS filesystem constants/structures |
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| 6 | */ |
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| 7 | #include <linux/buffer_head.h> |
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| 8 | #include <linux/string.h> |
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| 9 | #include <asm/byteorder.h> |
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| 10 | |||
| 11 | struct statfs; |
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| 12 | |||
| 13 | |||
| 14 | #define SECTOR_SIZE 512 /* sector size (bytes) */ |
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| 15 | #define SECTOR_BITS 9 /* log2(SECTOR_SIZE) */ |
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| 16 | #define MSDOS_DPB (MSDOS_DPS) /* dir entries per block */ |
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| 17 | #define MSDOS_DPB_BITS 4 /* log2(MSDOS_DPB) */ |
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| 18 | #define MSDOS_DPS (SECTOR_SIZE / sizeof(struct msdos_dir_entry)) |
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| 19 | #define MSDOS_DPS_BITS 4 /* log2(MSDOS_DPS) */ |
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| 20 | |||
| 21 | #define MSDOS_ROOT_INO 1 /* == MINIX_ROOT_INO */ |
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| 22 | #define MSDOS_DIR_BITS 5 /* log2(sizeof(struct msdos_dir_entry)) */ |
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| 23 | |||
| 24 | /* directory limit */ |
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| 25 | #define FAT_MAX_DIR_ENTRIES (65536) |
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| 26 | #define FAT_MAX_DIR_SIZE (FAT_MAX_DIR_ENTRIES << MSDOS_DIR_BITS) |
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| 27 | |||
| 28 | #define MSDOS_SUPER_MAGIC 0x4d44 /* MD */ |
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| 29 | |||
| 30 | #define ATTR_NONE 0 /* no attribute bits */ |
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| 31 | #define ATTR_RO 1 /* read-only */ |
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| 32 | #define ATTR_HIDDEN 2 /* hidden */ |
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| 33 | #define ATTR_SYS 4 /* system */ |
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| 34 | #define ATTR_VOLUME 8 /* volume label */ |
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| 35 | #define ATTR_DIR 16 /* directory */ |
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| 36 | #define ATTR_ARCH 32 /* archived */ |
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| 37 | |||
| 38 | #define ATTR_UNUSED (ATTR_VOLUME | ATTR_ARCH | ATTR_SYS | ATTR_HIDDEN) |
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| 39 | /* attribute bits that are copied "as is" */ |
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| 40 | #define ATTR_EXT (ATTR_RO | ATTR_HIDDEN | ATTR_SYS | ATTR_VOLUME) |
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| 41 | /* bits that are used by the Windows 95/Windows NT extended FAT */ |
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| 42 | |||
| 43 | #define CASE_LOWER_BASE 8 /* base is lower case */ |
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| 44 | #define CASE_LOWER_EXT 16 /* extension is lower case */ |
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| 45 | |||
| 46 | #define DELETED_FLAG 0xe5 /* marks file as deleted when in name[0] */ |
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| 47 | #define IS_FREE(n) (!*(n) || *(n) == DELETED_FLAG) |
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| 48 | |||
| 49 | #define MSDOS_VALID_MODE (S_IFREG | S_IFDIR | S_IRWXU | S_IRWXG | S_IRWXO) |
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| 50 | /* valid file mode bits */ |
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| 51 | |||
| 52 | #define MSDOS_NAME 11 /* maximum name length */ |
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| 53 | #define MSDOS_LONGNAME 256 /* maximum name length */ |
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| 54 | #define MSDOS_SLOTS 21 /* max # of slots needed for short and long names */ |
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| 55 | #define MSDOS_DOT ". " /* ".", padded to MSDOS_NAME chars */ |
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| 56 | #define MSDOS_DOTDOT ".. " /* "..", padded to MSDOS_NAME chars */ |
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| 57 | |||
| 58 | #define MSDOS_FAT12 4084 /* maximum number of clusters in a 12 bit FAT */ |
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| 59 | |||
| 60 | /* media of boot sector */ |
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| 61 | #define FAT_VALID_MEDIA(x) ((0xF8 <= (x) && (x) <= 0xFF) || (x) == 0xF0) |
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| 62 | #define FAT_FIRST_ENT(s, x) ((MSDOS_SB(s)->fat_bits == 32 ? 0x0FFFFF00 : \ |
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| 63 | MSDOS_SB(s)->fat_bits == 16 ? 0xFF00 : 0xF00) | (x)) |
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| 64 | |||
| 65 | /* bad cluster mark */ |
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| 66 | #define BAD_FAT12 0xFF7 |
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| 67 | #define BAD_FAT16 0xFFF7 |
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| 68 | #define BAD_FAT32 0xFFFFFF7 |
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| 69 | #define BAD_FAT(s) (MSDOS_SB(s)->fat_bits == 32 ? BAD_FAT32 : \ |
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| 70 | MSDOS_SB(s)->fat_bits == 16 ? BAD_FAT16 : BAD_FAT12) |
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| 71 | |||
| 72 | /* standard EOF */ |
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| 73 | #define EOF_FAT12 0xFFF |
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| 74 | #define EOF_FAT16 0xFFFF |
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| 75 | #define EOF_FAT32 0xFFFFFFF |
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| 76 | #define EOF_FAT(s) (MSDOS_SB(s)->fat_bits == 32 ? EOF_FAT32 : \ |
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| 77 | MSDOS_SB(s)->fat_bits == 16 ? EOF_FAT16 : EOF_FAT12) |
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| 78 | |||
| 79 | #define FAT_ENT_FREE (0) |
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| 80 | #define FAT_ENT_BAD (BAD_FAT32) |
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| 81 | #define FAT_ENT_EOF (EOF_FAT32) |
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| 82 | |||
| 83 | #define FAT_FSINFO_SIG1 0x41615252 |
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| 84 | #define FAT_FSINFO_SIG2 0x61417272 |
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| 85 | #define IS_FSINFO(x) (CF_LE_L((x)->signature1) == FAT_FSINFO_SIG1 \ |
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| 86 | && CF_LE_L((x)->signature2) == FAT_FSINFO_SIG2) |
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| 87 | |||
| 88 | /* |
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| 89 | * ioctl commands |
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| 90 | */ |
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| 91 | #define VFAT_IOCTL_READDIR_BOTH _IOR('r', 1, struct dirent [2]) |
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| 92 | #define VFAT_IOCTL_READDIR_SHORT _IOR('r', 2, struct dirent [2]) |
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| 93 | |||
| 94 | /* |
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| 95 | * vfat shortname flags |
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| 96 | */ |
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| 97 | #define VFAT_SFN_DISPLAY_LOWER 0x0001 /* convert to lowercase for display */ |
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| 98 | #define VFAT_SFN_DISPLAY_WIN95 0x0002 /* emulate win95 rule for display */ |
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| 99 | #define VFAT_SFN_DISPLAY_WINNT 0x0004 /* emulate winnt rule for display */ |
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| 100 | #define VFAT_SFN_CREATE_WIN95 0x0100 /* emulate win95 rule for create */ |
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| 101 | #define VFAT_SFN_CREATE_WINNT 0x0200 /* emulate winnt rule for create */ |
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| 102 | |||
| 103 | /* |
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| 104 | * Conversion from and to little-endian byte order. (no-op on i386/i486) |
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| 105 | * |
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| 106 | * Naming: Ca_b_c, where a: F = from, T = to, b: LE = little-endian, |
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| 107 | * BE = big-endian, c: W = word (16 bits), L = longword (32 bits) |
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| 108 | */ |
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| 109 | |||
| 110 | #define CF_LE_W(v) le16_to_cpu(v) |
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| 111 | #define CF_LE_L(v) le32_to_cpu(v) |
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| 112 | #define CT_LE_W(v) cpu_to_le16(v) |
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| 113 | #define CT_LE_L(v) cpu_to_le32(v) |
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| 114 | |||
| 115 | struct fat_boot_sector { |
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| 116 | __u8 ignored[3]; /* Boot strap short or near jump */ |
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| 117 | __u8 system_id[8]; /* Name - can be used to special case |
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| 118 | partition manager volumes */ |
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| 119 | __u8 sector_size[2]; /* bytes per logical sector */ |
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| 120 | __u8 sec_per_clus; /* sectors/cluster */ |
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| 121 | __u16 reserved; /* reserved sectors */ |
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| 122 | __u8 fats; /* number of FATs */ |
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| 123 | __u8 dir_entries[2]; /* root directory entries */ |
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| 124 | __u8 sectors[2]; /* number of sectors */ |
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| 125 | __u8 media; /* media code */ |
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| 126 | __u16 fat_length; /* sectors/FAT */ |
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| 127 | __u16 secs_track; /* sectors per track */ |
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| 128 | __u16 heads; /* number of heads */ |
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| 129 | __u32 hidden; /* hidden sectors (unused) */ |
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| 130 | __u32 total_sect; /* number of sectors (if sectors == 0) */ |
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| 131 | |||
| 132 | /* The following fields are only used by FAT32 */ |
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| 133 | __u32 fat32_length; /* sectors/FAT */ |
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| 134 | __u16 flags; /* bit 8: fat mirroring, low 4: active fat */ |
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| 135 | __u8 version[2]; /* major, minor filesystem version */ |
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| 136 | __u32 root_cluster; /* first cluster in root directory */ |
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| 137 | __u16 info_sector; /* filesystem info sector */ |
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| 138 | __u16 backup_boot; /* backup boot sector */ |
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| 139 | __u16 reserved2[6]; /* Unused */ |
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| 140 | }; |
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| 141 | |||
| 142 | struct fat_boot_fsinfo { |
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| 143 | __u32 signature1; /* 0x41615252L */ |
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| 144 | __u32 reserved1[120]; /* Nothing as far as I can tell */ |
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| 145 | __u32 signature2; /* 0x61417272L */ |
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| 146 | __u32 free_clusters; /* Free cluster count. -1 if unknown */ |
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| 147 | __u32 next_cluster; /* Most recently allocated cluster */ |
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| 148 | __u32 reserved2[4]; |
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| 149 | }; |
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| 150 | |||
| 151 | struct msdos_dir_entry { |
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| 152 | __u8 name[8],ext[3]; /* name and extension */ |
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| 153 | __u8 attr; /* attribute bits */ |
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| 154 | __u8 lcase; /* Case for base and extension */ |
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| 155 | __u8 ctime_ms; /* Creation time, milliseconds */ |
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| 156 | __u16 ctime; /* Creation time */ |
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| 157 | __u16 cdate; /* Creation date */ |
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| 158 | __u16 adate; /* Last access date */ |
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| 159 | __u16 starthi; /* High 16 bits of cluster in FAT32 */ |
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| 160 | __u16 time,date,start;/* time, date and first cluster */ |
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| 161 | __u32 size; /* file size (in bytes) */ |
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| 162 | }; |
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| 163 | |||
| 164 | /* Up to 13 characters of the name */ |
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| 165 | struct msdos_dir_slot { |
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| 166 | __u8 id; /* sequence number for slot */ |
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| 167 | __u8 name0_4[10]; /* first 5 characters in name */ |
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| 168 | __u8 attr; /* attribute byte */ |
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| 169 | __u8 reserved; /* always 0 */ |
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| 170 | __u8 alias_checksum; /* checksum for 8.3 alias */ |
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| 171 | __u8 name5_10[12]; /* 6 more characters in name */ |
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| 172 | __u16 start; /* starting cluster number, 0 in long slots */ |
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| 173 | __u8 name11_12[4]; /* last 2 characters in name */ |
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| 174 | }; |
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| 175 | |||
| 176 | struct vfat_slot_info { |
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| 177 | int long_slots; /* number of long slots in filename */ |
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| 178 | loff_t longname_offset; /* dir offset for longname start */ |
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| 179 | loff_t i_pos; /* on-disk position of directory entry */ |
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| 180 | }; |
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| 181 | |||
| 182 | /* Convert attribute bits and a mask to the UNIX mode. */ |
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| 183 | #define MSDOS_MKMODE(a,m) (m & (a & ATTR_RO ? S_IRUGO|S_IXUGO : S_IRWXUGO)) |
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| 184 | |||
| 185 | /* Convert the UNIX mode to MS-DOS attribute bits. */ |
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| 186 | #define MSDOS_MKATTR(m) ((m & S_IWUGO) ? ATTR_NONE : ATTR_RO) |
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| 187 | |||
| 188 | |||
| 189 | #ifdef __KERNEL__ |
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| 190 | |||
| 191 | #include <linux/nls.h> |
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| 192 | #include <linux/msdos_fs_i.h> |
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| 193 | #include <linux/msdos_fs_sb.h> |
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| 194 | |||
| 195 | static inline struct msdos_sb_info *MSDOS_SB(struct super_block *sb) |
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| 196 | { |
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| 197 | return sb->s_fs_info; |
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| 198 | } |
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| 199 | |||
| 200 | static inline struct msdos_inode_info *MSDOS_I(struct inode *inode) |
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| 201 | { |
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| 202 | return container_of(inode, struct msdos_inode_info, vfs_inode); |
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| 203 | } |
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| 204 | |||
| 205 | static inline void fat16_towchar(wchar_t *dst, const __u8 *src, size_t len) |
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| 206 | { |
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| 207 | #ifdef __BIG_ENDIAN |
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| 208 | while (len--) { |
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| 209 | *dst++ = src[0] | (src[1] << 8); |
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| 210 | src += 2; |
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| 211 | } |
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| 212 | #else |
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| 213 | memcpy(dst, src, len * 2); |
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| 214 | #endif |
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| 215 | } |
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| 216 | |||
| 217 | static inline void fatwchar_to16(__u8 *dst, const wchar_t *src, size_t len) |
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| 218 | { |
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| 219 | #ifdef __BIG_ENDIAN |
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| 220 | while (len--) { |
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| 221 | dst[0] = *src & 0x00FF; |
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| 222 | dst[1] = (*src & 0xFF00) >> 8; |
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| 223 | dst += 2; |
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| 224 | src++; |
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| 225 | } |
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| 226 | #else |
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| 227 | memcpy(dst, src, len * 2); |
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| 228 | #endif |
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| 229 | } |
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| 230 | |||
| 231 | /* fat/cache.c */ |
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| 232 | extern int fat_access(struct super_block *sb, int nr, int new_value); |
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| 233 | extern int __fat_access(struct super_block *sb, int nr, int new_value); |
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| 234 | extern int fat_bmap(struct inode *inode, sector_t sector, sector_t *phys); |
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| 235 | extern void fat_cache_init(struct super_block *sb); |
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| 236 | extern void fat_cache_lookup(struct inode *inode, int cluster, int *f_clu, |
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| 237 | int *d_clu); |
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| 238 | extern void fat_cache_add(struct inode *inode, int f_clu, int d_clu); |
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| 239 | extern void fat_cache_inval_inode(struct inode *inode); |
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| 240 | extern int fat_get_cluster(struct inode *inode, int cluster, |
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| 241 | int *fclus, int *dclus); |
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| 242 | extern int fat_free(struct inode *inode, int skip); |
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| 243 | |||
| 244 | /* fat/dir.c */ |
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| 245 | extern struct file_operations fat_dir_operations; |
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| 246 | extern int fat_search_long(struct inode *inode, const unsigned char *name, |
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| 247 | int name_len, int anycase, |
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| 248 | loff_t *spos, loff_t *lpos); |
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| 249 | extern int fat_readdir(struct file *filp, void *dirent, filldir_t filldir); |
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| 250 | extern int fat_dir_ioctl(struct inode * inode, struct file * filp, |
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| 251 | unsigned int cmd, unsigned long arg); |
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| 252 | extern int fat_add_entries(struct inode *dir, int slots, struct buffer_head **bh, |
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| 253 | struct msdos_dir_entry **de, loff_t *i_pos); |
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| 254 | extern int fat_new_dir(struct inode *dir, struct inode *parent, int is_vfat); |
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| 255 | extern int fat_dir_empty(struct inode *dir); |
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| 256 | extern int fat_subdirs(struct inode *dir); |
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| 257 | extern int fat_scan(struct inode *dir, const unsigned char *name, |
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| 258 | struct buffer_head **res_bh, |
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| 259 | struct msdos_dir_entry **res_de, loff_t *i_pos); |
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| 260 | |||
| 261 | /* fat/file.c */ |
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| 262 | extern struct file_operations fat_file_operations; |
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| 263 | extern struct inode_operations fat_file_inode_operations; |
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| 264 | extern int fat_get_block(struct inode *inode, sector_t iblock, |
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| 265 | struct buffer_head *bh_result, int create); |
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| 266 | extern void fat_truncate(struct inode *inode); |
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| 267 | |||
| 268 | /* fat/inode.c */ |
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| 269 | extern void fat_hash_init(void); |
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| 270 | extern void fat_attach(struct inode *inode, loff_t i_pos); |
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| 271 | extern void fat_detach(struct inode *inode); |
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| 272 | extern struct inode *fat_iget(struct super_block *sb, loff_t i_pos); |
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| 273 | extern struct inode *fat_build_inode(struct super_block *sb, |
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| 274 | struct msdos_dir_entry *de, loff_t i_pos, int *res); |
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| 275 | extern void fat_delete_inode(struct inode *inode); |
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| 276 | extern void fat_clear_inode(struct inode *inode); |
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| 277 | extern void fat_put_super(struct super_block *sb); |
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| 278 | int fat_fill_super(struct super_block *sb, void *data, int silent, |
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| 279 | struct inode_operations *fs_dir_inode_ops, int isvfat); |
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| 280 | extern int fat_statfs(struct super_block *sb, struct kstatfs *buf); |
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| 281 | extern void fat_write_inode(struct inode *inode, int wait); |
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| 282 | extern int fat_notify_change(struct dentry * dentry, struct iattr * attr); |
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| 283 | |||
| 284 | /* fat/misc.c */ |
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| 285 | extern void fat_fs_panic(struct super_block *s, const char *fmt, ...); |
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| 286 | extern void lock_fat(struct super_block *sb); |
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| 287 | extern void unlock_fat(struct super_block *sb); |
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| 288 | extern void fat_clusters_flush(struct super_block *sb); |
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| 289 | extern int fat_add_cluster(struct inode *inode); |
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| 290 | extern struct buffer_head *fat_extend_dir(struct inode *inode); |
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| 291 | extern int date_dos2unix(unsigned short time, unsigned short date); |
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| 292 | extern void fat_date_unix2dos(int unix_date, unsigned short *time, |
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| 293 | unsigned short *date); |
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| 294 | extern int fat__get_entry(struct inode *dir, loff_t *pos, |
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| 295 | struct buffer_head **bh, |
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| 296 | struct msdos_dir_entry **de, loff_t *i_pos); |
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| 297 | static __inline__ int fat_get_entry(struct inode *dir, loff_t *pos, |
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| 298 | struct buffer_head **bh, |
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| 299 | struct msdos_dir_entry **de, loff_t *i_pos) |
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| 300 | { |
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| 301 | /* Fast stuff first */ |
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| 302 | if (*bh && *de && |
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| 303 | (*de - (struct msdos_dir_entry *)(*bh)->b_data) < MSDOS_SB(dir->i_sb)->dir_per_block - 1) { |
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| 304 | *pos += sizeof(struct msdos_dir_entry); |
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| 305 | (*de)++; |
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| 306 | (*i_pos)++; |
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| 307 | return 0; |
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| 308 | } |
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| 309 | return fat__get_entry(dir, pos, bh, de, i_pos); |
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| 310 | } |
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| 311 | |||
| 312 | /* msdos/namei.c - these are for Umsdos */ |
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| 313 | extern struct dentry *msdos_lookup(struct inode *dir, struct dentry *, struct nameidata *); |
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| 314 | extern int msdos_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *); |
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| 315 | extern int msdos_rmdir(struct inode *dir, struct dentry *dentry); |
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| 316 | extern int msdos_mkdir(struct inode *dir, struct dentry *dentry, int mode); |
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| 317 | extern int msdos_unlink(struct inode *dir, struct dentry *dentry); |
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| 318 | extern int msdos_rename(struct inode *old_dir, struct dentry *old_dentry, |
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| 319 | struct inode *new_dir, struct dentry *new_dentry); |
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| 320 | extern int msdos_fill_super(struct super_block *sb, void *data, int silent); |
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| 321 | |||
| 322 | /* vfat/namei.c - these are for dmsdos */ |
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| 323 | extern struct dentry *vfat_lookup(struct inode *dir, struct dentry *, struct nameidata *); |
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| 324 | extern int vfat_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *); |
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| 325 | extern int vfat_rmdir(struct inode *dir, struct dentry *dentry); |
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| 326 | extern int vfat_unlink(struct inode *dir, struct dentry *dentry); |
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| 327 | extern int vfat_mkdir(struct inode *dir, struct dentry *dentry, int mode); |
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| 328 | extern int vfat_rename(struct inode *old_dir, struct dentry *old_dentry, |
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| 329 | struct inode *new_dir, struct dentry *new_dentry); |
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| 330 | extern int vfat_fill_super(struct super_block *sb, void *data, int silent); |
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| 331 | |||
| 332 | /* vfat/vfatfs_syms.c */ |
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| 333 | extern struct file_system_type vfat_fs_type; |
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| 334 | |||
| 335 | #endif /* __KERNEL__ */ |
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| 336 | |||
| 337 | #endif |