| 1 | /*
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| 2 | * Copyright (c) 2011 Martin Sucha
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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 libext2
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| 30 | * @{
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| 31 | */
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| 32 | /**
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| 33 | * @file
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| 34 | */
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| 35 |
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| 36 | #ifndef LIBEXT2_LIBEXT2_H_
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| 37 | #define LIBEXT2_LIBEXT2_H_
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| 38 |
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| 39 | #include <byteorder.h>
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| 40 | #include <libblock.h>
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| 41 |
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| 42 | typedef struct ext2_superblock {
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| 43 | uint8_t unused[20];
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| 44 | uint32_t first_block; // Block containing the superblock (either 0 or 1)
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| 45 | uint32_t block_size_log2; // log_2(block_size)
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| 46 | int32_t fragment_size_log2; // log_2(fragment size)
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| 47 | uint32_t blocks_per_group; // Number of blocks in one block group
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| 48 | uint32_t fragments_per_group; // Number of fragments per block group
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| 49 | uint32_t inodes_per_group; // Number of inodes per block group
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| 50 | uint8_t unused2[12];
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| 51 | uint16_t magic; // Magic value
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| 52 | uint16_t state; // State (mounted/unmounted)
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| 53 | uint16_t rev_minor; // Minor revision level
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| 54 | uint8_t unused3[12];
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| 55 | uint32_t creator_os;
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| 56 | uint32_t rev_major; // Major revision level
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| 57 | uint8_t unused4[8];
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| 58 |
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| 59 | // Following is for ext2 revision 1 only
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| 60 | uint32_t first_inode;
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| 61 | uint16_t inode_size;
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| 62 | uint8_t unused5[14];
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| 63 | uint8_t uuid[16]; // UUID TODO: Create a library for UUIDs
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| 64 | uint8_t volume_name[16];
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| 65 |
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| 66 | // TODO: add __attribute__((aligned(...)) for better performance?
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| 67 | // (it is necessary to ensure the superblock is correctly aligned then
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| 68 | // though)
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| 69 | } __attribute__ ((packed)) ext2_superblock_t;
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| 70 |
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| 71 |
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| 72 | typedef struct ext2_filesystem {
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| 73 | devmap_handle_t device;
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| 74 | ext2_superblock_t * superblock;
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| 75 | } ext2_filesystem_t;
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| 76 |
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| 77 | #define EXT2_SUPERBLOCK_MAGIC 0xEF53
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| 78 | #define EXT2_SUPERBLOCK_SIZE 1024
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| 79 | #define EXT2_SUPERBLOCK_OFFSET 1024
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| 80 | #define EXT2_SUPERBLOCK_LAST_BYTE (EXT2_SUPERBLOCK_OFFSET + \
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| 81 | EXT2_SUPERBLOCK_SIZE -1)
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| 82 | // allow maximum this block size
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| 83 | #define EXT2_MAX_BLOCK_SIZE 8096
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| 84 | #define EXT2_REV0_FIRST_INODE 11
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| 85 | #define EXT2_REV0_INODE_SIZE 128
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| 86 |
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| 87 | inline uint16_t ext2_superblock_get_magic(ext2_superblock_t *);
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| 88 | inline uint32_t ext2_superblock_get_first_block(ext2_superblock_t *);
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| 89 | inline uint32_t ext2_superblock_get_block_size_log2(ext2_superblock_t *);
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| 90 | inline uint32_t ext2_superblock_get_block_size(ext2_superblock_t *);
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| 91 | inline int32_t ext2_superblock_get_fragment_size_log2(ext2_superblock_t *);
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| 92 | inline uint32_t ext2_superblock_get_fragment_size(ext2_superblock_t *);
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| 93 | inline uint32_t ext2_superblock_get_blocks_per_group(ext2_superblock_t *);
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| 94 | inline uint32_t ext2_superblock_get_fragments_per_group(ext2_superblock_t *);
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| 95 | inline uint16_t ext2_superblock_get_state(ext2_superblock_t *);
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| 96 | inline uint16_t ext2_superblock_get_rev_minor(ext2_superblock_t *);
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| 97 | inline uint32_t ext2_superblock_get_rev_major(ext2_superblock_t *);
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| 98 | inline uint32_t ext2_superblock_get_creator_os(ext2_superblock_t *);
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| 99 | inline uint32_t ext2_superblock_get_first_inode(ext2_superblock_t *);
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| 100 | inline uint16_t ext2_superblock_get_inode_size(ext2_superblock_t *);
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| 101 |
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| 102 | extern int ext2_superblock_read_direct(devmap_handle_t, ext2_superblock_t **);
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| 103 |
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| 104 | extern int ext2_filesystem_init(ext2_filesystem_t *, devmap_handle_t);
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| 105 | extern void ext2_filesystem_fini(ext2_filesystem_t *);
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| 106 |
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| 107 | #endif
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| 108 |
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| 109 | /** @}
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| 110 | */
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