| 1 | /*
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| 2 | * Copyright (c) 2011 Maurizio Lombardi
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | /** @addtogroup libminix
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| 30 | * @{
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| 31 | */
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| 32 |
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| 33 | #ifndef _MINIX_FS_H_
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| 34 | #define _MINIX_FS_H_
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| 35 |
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| 36 | #include <stdint.h>
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| 37 |
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| 38 | #define MFS_BLOCKSIZE 1024
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| 39 | #define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
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| 40 | #define S_ISREG(m) (((m) & S_IFMT) == S_IFREG)
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| 41 | #define S_IFDIR 0040000 /* Directory */
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| 42 | #define S_IFREG 0100000 /* Regular file */
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| 43 | #define S_IFMT 00170000
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| 44 |
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| 45 | /* The following block sizes are valid only on V3 filesystem */
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| 46 | #define MFS_MIN_BLOCKSIZE 1024
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| 47 | #define MFS_MAX_BLOCKSIZE 4096
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| 48 |
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| 49 | #define MFS_ROOT_INO 1
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| 50 | #define MFS_SUPERBLOCK 1
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| 51 | #define MFS_SUPERBLOCK_SIZE 1024
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| 52 | #define MFS_BOOTBLOCK_SIZE 1024
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| 53 |
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| 54 | #define V2_NR_DIRECT_ZONES 7
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| 55 | #define V2_NR_INDIRECT_ZONES 3
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| 56 |
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| 57 | #define V1_NR_DIRECT_ZONES 7
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| 58 | #define V1_NR_INDIRECT_ZONES 2
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| 59 |
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| 60 | #define V1_INODES_PER_BLOCK (MFS_BLOCKSIZE / sizeof(struct mfs_inode))
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| 61 | #define V2_INODES_PER_BLOCK (MFS_BLOCKSIZE / sizeof(struct mfs2_inode))
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| 62 | #define V3_INODES_PER_BLOCK(bs) ((bs) / sizeof(struct mfs2_inode))
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| 63 |
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| 64 | #define MFS_DIRSIZE 16
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| 65 | #define MFSL_DIRSIZE 32
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| 66 | #define MFS3_DIRSIZE 64
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| 67 |
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| 68 | #define MFS_MAX_NAME_LEN 14
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| 69 | #define MFS_L_MAX_NAME_LEN 30
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| 70 | #define MFS3_MAX_NAME_LEN 60
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| 71 |
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| 72 | #define MFS_MAGIC_V1 0x137F
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| 73 | #define MFS_MAGIC_V1R 0x7F13
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| 74 |
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| 75 | #define MFS_MAGIC_V1L 0x138F
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| 76 | #define MFS_MAGIC_V1LR 0x8F13
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| 77 |
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| 78 | #define MFS_MAGIC_V2 0x2468
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| 79 | #define MFS_MAGIC_V2R 0x6824
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| 80 |
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| 81 | #define MFS_MAGIC_V2L 0x2478
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| 82 | #define MFS_MAGIC_V2LR 0x7824
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| 83 |
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| 84 | #define MFS_MAGIC_V3 0x4D5A
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| 85 | #define MFS_MAGIC_V3R 0x5A4D
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| 86 |
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| 87 | #define MFS_VALID_FS 0x0001
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| 88 | #define MFS_ERROR_FS 0x0002
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| 89 |
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| 90 | /* MFS V1/V2 superblock data on disk */
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| 91 | struct mfs_superblock {
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| 92 | /* Total number of inodes on the device */
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| 93 | uint16_t s_ninodes;
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| 94 | /* Total number of zones on the device */
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| 95 | uint16_t s_nzones;
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| 96 | /* Number of inode bitmap blocks */
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| 97 | uint16_t s_ibmap_blocks;
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| 98 | /* Number of zone bitmap blocks */
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| 99 | uint16_t s_zbmap_blocks;
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| 100 | /* First data zone on device */
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| 101 | uint16_t s_first_data_zone;
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| 102 | /* Base 2 logarithm of the zone to block ratio */
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| 103 | uint16_t s_log2_zone_size;
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| 104 | /* Maximum file size expressed in bytes */
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| 105 | uint32_t s_max_file_size;
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| 106 | /*
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| 107 | * Magic number used to recognize MinixFS
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| 108 | * and to detect on-disk endianness
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| 109 | */
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| 110 | uint16_t s_magic;
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| 111 | /* Flag used to detect FS errors*/
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| 112 | uint16_t s_state;
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| 113 | /* Total number of zones on the device (V2 only) */
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| 114 | uint32_t s_nzones2;
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| 115 | } __attribute__((packed));
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| 116 |
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| 117 | /* MFS V3 superblock data on disk */
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| 118 | struct mfs3_superblock {
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| 119 | /* Total number of inodes on the device */
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| 120 | uint32_t s_ninodes;
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| 121 | uint16_t s_pad0;
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| 122 | /* Number of inode bitmap blocks */
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| 123 | int16_t s_ibmap_blocks;
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| 124 | /* Number of zone bitmap blocks */
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| 125 | int16_t s_zbmap_blocks;
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| 126 | /* First data zone on device */
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| 127 | uint16_t s_first_data_zone;
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| 128 | /* Base 2 logarithm of the zone to block ratio */
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| 129 | int16_t s_log2_zone_size;
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| 130 | int16_t s_pad1;
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| 131 | /* Maximum file size expressed in bytes */
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| 132 | uint32_t s_max_file_size;
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| 133 | /* Total number of zones on the device */
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| 134 | uint32_t s_nzones;
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| 135 | /*
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| 136 | * Magic number used to recognize MinixFS
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| 137 | * and to detect on-disk endianness
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| 138 | */
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| 139 | int16_t s_magic;
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| 140 | int16_t s_pad2;
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| 141 | /* Filesystem block size expressed in bytes */
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| 142 | uint16_t s_block_size;
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| 143 | /* Filesystem disk format version */
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| 144 | int8_t s_disk_version;
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| 145 | } __attribute__((packed));
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| 146 |
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| 147 | /* MinixFS V1 inode structure as it is on disk */
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| 148 | struct mfs_inode {
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| 149 | uint16_t i_mode;
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| 150 | int16_t i_uid;
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| 151 | int32_t i_size;
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| 152 | int32_t i_mtime;
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| 153 | uint8_t i_gid;
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| 154 | uint8_t i_nlinks;
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| 155 | /* Block numbers for direct zones */
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| 156 | uint16_t i_dzone[V1_NR_DIRECT_ZONES];
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| 157 | /* Block numbers for indirect zones */
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| 158 | uint16_t i_izone[V1_NR_INDIRECT_ZONES];
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| 159 | } __attribute__((packed));
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| 160 |
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| 161 | /* MinixFS V2 inode structure as it is on disk (also valid for V3). */
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| 162 | struct mfs2_inode {
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| 163 | uint16_t i_mode;
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| 164 | uint16_t i_nlinks;
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| 165 | int16_t i_uid;
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| 166 | uint16_t i_gid;
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| 167 | int32_t i_size;
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| 168 | int32_t i_atime;
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| 169 | int32_t i_mtime;
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| 170 | int32_t i_ctime;
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| 171 | /* Block numbers for direct zones */
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| 172 | uint32_t i_dzone[V2_NR_DIRECT_ZONES];
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| 173 | /* Block numbers for indirect zones */
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| 174 | uint32_t i_izone[V2_NR_INDIRECT_ZONES];
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| 175 | } __attribute__((packed));
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| 176 |
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| 177 | /* MinixFS V1/V2 directory entry on-disk structure */
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| 178 | struct mfs_dentry {
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| 179 | uint16_t d_inum;
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| 180 | char d_name[0];
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| 181 | };
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| 182 |
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| 183 | /* MinixFS V3 directory entry on-disk structure */
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| 184 | struct mfs3_dentry {
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| 185 | uint32_t d_inum;
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| 186 | char d_name[0];
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| 187 | };
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| 188 |
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| 189 | #endif
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| 190 |
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| 191 | /**
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| 192 | * @}
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| 193 | */
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