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* Copyright (c) 2011 Martin Sucha
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* - The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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/** @addtogroup libext2
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#ifndef LIBEXT2_LIBEXT2_SUPERBLOCK_H_
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#define LIBEXT2_LIBEXT2_SUPERBLOCK_H_
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typedef struct ext2_superblock {
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uint32_t total_inode_count; // Total number of inodes
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uint32_t total_block_count; // Total number of blocks
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uint32_t reserved_block_count; // Total number of reserved blocks
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uint32_t free_block_count; // Total number of free blocks
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uint32_t free_inode_count; // Total number of free inodes
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uint32_t first_block; // Block containing the superblock (either 0 or 1)
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uint32_t block_size_log2; // log_2(block_size)
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int32_t fragment_size_log2; // log_2(fragment size)
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uint32_t blocks_per_group; // Number of blocks in one block group
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uint32_t fragments_per_group; // Number of fragments per block group
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uint32_t inodes_per_group; // Number of inodes per block group
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uint16_t magic; // Magic value
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uint16_t state; // State (mounted/unmounted)
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uint16_t error_behavior; // What to do when errors are encountered
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uint16_t rev_minor; // Minor revision level
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uint32_t os; // OS that created the filesystem
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uint32_t rev_major; // Major revision level
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// Following is for ext2 revision 1 only
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uint32_t features_compatible;
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uint32_t features_incompatible;
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uint32_t features_read_only;
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uint8_t uuid[16]; // UUID TODO: Create a library for UUIDs
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uint8_t volume_name[16];
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// TODO: add __attribute__((aligned(...)) for better performance?
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// (it is necessary to ensure the superblock is correctly aligned then
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} __attribute__ ((packed)) ext2_superblock_t;
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#define EXT2_SUPERBLOCK_MAGIC 0xEF53
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#define EXT2_SUPERBLOCK_SIZE 1024
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#define EXT2_SUPERBLOCK_OFFSET 1024
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#define EXT2_SUPERBLOCK_LAST_BYTE (EXT2_SUPERBLOCK_OFFSET + \
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EXT2_SUPERBLOCK_SIZE -1)
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#define EXT2_SUPERBLOCK_OS_LINUX 0
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#define EXT2_SUPERBLOCK_OS_HURD 1
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extern uint16_t ext2_superblock_get_magic(ext2_superblock_t *);
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extern uint32_t ext2_superblock_get_first_block(ext2_superblock_t *);
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extern uint32_t ext2_superblock_get_block_size_log2(ext2_superblock_t *);
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extern uint32_t ext2_superblock_get_block_size(ext2_superblock_t *);
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extern int32_t ext2_superblock_get_fragment_size_log2(ext2_superblock_t *);
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extern uint32_t ext2_superblock_get_fragment_size(ext2_superblock_t *);
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extern uint32_t ext2_superblock_get_blocks_per_group(ext2_superblock_t *);
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extern uint32_t ext2_superblock_get_fragments_per_group(ext2_superblock_t *);
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extern uint16_t ext2_superblock_get_state(ext2_superblock_t *);
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extern uint16_t ext2_superblock_get_rev_minor(ext2_superblock_t *);
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extern uint32_t ext2_superblock_get_rev_major(ext2_superblock_t *);
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extern uint32_t ext2_superblock_get_os(ext2_superblock_t *);
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extern uint32_t ext2_superblock_get_first_inode(ext2_superblock_t *);
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extern uint16_t ext2_superblock_get_inode_size(ext2_superblock_t *);
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extern uint32_t ext2_superblock_get_total_inode_count(ext2_superblock_t *);
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extern uint32_t ext2_superblock_get_total_block_count(ext2_superblock_t *);
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extern uint32_t ext2_superblock_get_reserved_block_count(ext2_superblock_t *);
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extern uint32_t ext2_superblock_get_free_block_count(ext2_superblock_t *);
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extern uint32_t ext2_superblock_get_free_inode_count(ext2_superblock_t *);
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extern uint32_t ext2_superblock_get_block_group_count(ext2_superblock_t *);
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extern uint32_t ext2_superblock_get_inodes_per_group(ext2_superblock_t *);
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extern uint32_t ext2_superblock_get_features_compatible(ext2_superblock_t *);
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extern uint32_t ext2_superblock_get_features_incompatible(ext2_superblock_t *);
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extern uint32_t ext2_superblock_get_features_read_only(ext2_superblock_t *);
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extern int ext2_superblock_read_direct(devmap_handle_t, ext2_superblock_t **);
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extern int ext2_superblock_check_sanity(ext2_superblock_t *);
added
removed
uspace/lib/ext2/libext2_superblock.h
