| 1 | /*
|
|---|
| 2 | * Copyright (c) 2011 Martin Sucha
|
|---|
| 3 | * All rights reserved.
|
|---|
| 4 | *
|
|---|
| 5 | * Redistribution and use in source and binary forms, with or without
|
|---|
| 6 | * modification, are permitted provided that the following conditions
|
|---|
| 7 | * are met:
|
|---|
| 8 | *
|
|---|
| 9 | * - Redistributions of source code must retain the above copyright
|
|---|
| 10 | * notice, this list of conditions and the following disclaimer.
|
|---|
| 11 | * - Redistributions in binary form must reproduce the above copyright
|
|---|
| 12 | * notice, this list of conditions and the following disclaimer in the
|
|---|
| 13 | * documentation and/or other materials provided with the distribution.
|
|---|
| 14 | * - The name of the author may not be used to endorse or promote products
|
|---|
| 15 | * derived from this software without specific prior written permission.
|
|---|
| 16 | *
|
|---|
| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|---|
| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|---|
| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|---|
| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|---|
| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|---|
| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|---|
| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|---|
| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|---|
| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|---|
| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|---|
| 27 | */
|
|---|
| 28 |
|
|---|
| 29 | /** @addtogroup libext2
|
|---|
| 30 | * @{
|
|---|
| 31 | */
|
|---|
| 32 | /**
|
|---|
| 33 | * @file
|
|---|
| 34 | */
|
|---|
| 35 |
|
|---|
| 36 | #ifndef LIBEXT2_LIBEXT2_SUPERBLOCK_H_
|
|---|
| 37 | #define LIBEXT2_LIBEXT2_SUPERBLOCK_H_
|
|---|
| 38 |
|
|---|
| 39 | #include <libblock.h>
|
|---|
| 40 |
|
|---|
| 41 | typedef struct ext2_superblock {
|
|---|
| 42 | uint32_t total_inode_count; // Total number of inodes
|
|---|
| 43 | uint32_t total_block_count; // Total number of blocks
|
|---|
| 44 | uint32_t reserved_block_count; // Total number of reserved blocks
|
|---|
| 45 | uint32_t free_block_count; // Total number of free blocks
|
|---|
| 46 | uint32_t free_inode_count; // Total number of free inodes
|
|---|
| 47 | uint32_t first_block; // Block containing the superblock (either 0 or 1)
|
|---|
| 48 | uint32_t block_size_log2; // log_2(block_size)
|
|---|
| 49 | int32_t fragment_size_log2; // log_2(fragment size)
|
|---|
| 50 | uint32_t blocks_per_group; // Number of blocks in one block group
|
|---|
| 51 | uint32_t fragments_per_group; // Number of fragments per block group
|
|---|
| 52 | uint32_t inodes_per_group; // Number of inodes per block group
|
|---|
| 53 | uint8_t unused2[12];
|
|---|
| 54 | uint16_t magic; // Magic value
|
|---|
| 55 | uint16_t state; // State (mounted/unmounted)
|
|---|
| 56 | uint16_t error_behavior; // What to do when errors are encountered
|
|---|
| 57 | uint16_t rev_minor; // Minor revision level
|
|---|
| 58 | uint8_t unused3[8];
|
|---|
| 59 | uint32_t os; // OS that created the filesystem
|
|---|
| 60 | uint32_t rev_major; // Major revision level
|
|---|
| 61 | uint8_t unused4[4];
|
|---|
| 62 |
|
|---|
| 63 | // Following is for ext2 revision 1 only
|
|---|
| 64 | uint32_t first_inode;
|
|---|
| 65 | uint16_t inode_size;
|
|---|
| 66 | uint16_t unused5;
|
|---|
| 67 | uint32_t features_compatible;
|
|---|
| 68 | uint32_t features_incompatible;
|
|---|
| 69 | uint32_t features_read_only;
|
|---|
| 70 | uint8_t uuid[16]; // UUID TODO: Create a library for UUIDs
|
|---|
| 71 | uint8_t volume_name[16];
|
|---|
| 72 |
|
|---|
| 73 | // TODO: add __attribute__((aligned(...)) for better performance?
|
|---|
| 74 | // (it is necessary to ensure the superblock is correctly aligned then
|
|---|
| 75 | // though)
|
|---|
| 76 | } __attribute__ ((packed)) ext2_superblock_t;
|
|---|
| 77 |
|
|---|
| 78 | #define EXT2_SUPERBLOCK_MAGIC 0xEF53
|
|---|
| 79 | #define EXT2_SUPERBLOCK_SIZE 1024
|
|---|
| 80 | #define EXT2_SUPERBLOCK_OFFSET 1024
|
|---|
| 81 | #define EXT2_SUPERBLOCK_LAST_BYTE (EXT2_SUPERBLOCK_OFFSET + \
|
|---|
| 82 | EXT2_SUPERBLOCK_SIZE -1)
|
|---|
| 83 | #define EXT2_SUPERBLOCK_OS_LINUX 0
|
|---|
| 84 | #define EXT2_SUPERBLOCK_OS_HURD 1
|
|---|
| 85 |
|
|---|
| 86 |
|
|---|
| 87 | extern uint16_t ext2_superblock_get_magic(ext2_superblock_t *);
|
|---|
| 88 | extern uint32_t ext2_superblock_get_first_block(ext2_superblock_t *);
|
|---|
| 89 | extern uint32_t ext2_superblock_get_block_size_log2(ext2_superblock_t *);
|
|---|
| 90 | extern uint32_t ext2_superblock_get_block_size(ext2_superblock_t *);
|
|---|
| 91 | extern int32_t ext2_superblock_get_fragment_size_log2(ext2_superblock_t *);
|
|---|
| 92 | extern uint32_t ext2_superblock_get_fragment_size(ext2_superblock_t *);
|
|---|
| 93 | extern uint32_t ext2_superblock_get_blocks_per_group(ext2_superblock_t *);
|
|---|
| 94 | extern uint32_t ext2_superblock_get_fragments_per_group(ext2_superblock_t *);
|
|---|
| 95 | extern uint16_t ext2_superblock_get_state(ext2_superblock_t *);
|
|---|
| 96 | extern uint16_t ext2_superblock_get_rev_minor(ext2_superblock_t *);
|
|---|
| 97 | extern uint32_t ext2_superblock_get_rev_major(ext2_superblock_t *);
|
|---|
| 98 | extern uint32_t ext2_superblock_get_os(ext2_superblock_t *);
|
|---|
| 99 | extern uint32_t ext2_superblock_get_first_inode(ext2_superblock_t *);
|
|---|
| 100 | extern uint16_t ext2_superblock_get_inode_size(ext2_superblock_t *);
|
|---|
| 101 | extern uint32_t ext2_superblock_get_total_inode_count(ext2_superblock_t *);
|
|---|
| 102 | extern uint32_t ext2_superblock_get_total_block_count(ext2_superblock_t *);
|
|---|
| 103 | extern uint32_t ext2_superblock_get_reserved_block_count(ext2_superblock_t *);
|
|---|
| 104 | extern uint32_t ext2_superblock_get_free_block_count(ext2_superblock_t *);
|
|---|
| 105 | extern uint32_t ext2_superblock_get_free_inode_count(ext2_superblock_t *);
|
|---|
| 106 | extern uint32_t ext2_superblock_get_block_group_count(ext2_superblock_t *);
|
|---|
| 107 | extern uint32_t ext2_superblock_get_inodes_per_group(ext2_superblock_t *);
|
|---|
| 108 | extern uint32_t ext2_superblock_get_features_compatible(ext2_superblock_t *);
|
|---|
| 109 | extern uint32_t ext2_superblock_get_features_incompatible(ext2_superblock_t *);
|
|---|
| 110 | extern uint32_t ext2_superblock_get_features_read_only(ext2_superblock_t *);
|
|---|
| 111 |
|
|---|
| 112 | extern int ext2_superblock_read_direct(service_id_t, ext2_superblock_t **);
|
|---|
| 113 | extern int ext2_superblock_check_sanity(ext2_superblock_t *);
|
|---|
| 114 |
|
|---|
| 115 | #endif
|
|---|
| 116 |
|
|---|
| 117 | /** @}
|
|---|
| 118 | */
|
|---|
