| 1 | /*
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| 2 | * Copyright (c) 2011 Frantisek Princ
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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 libext4
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| 30 | * @{
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| 31 | */
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| 32 |
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| 33 | #ifndef LIBEXT4_LIBEXT4_BLOCK_GROUP_H_
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| 34 | #define LIBEXT4_LIBEXT4_BLOCK_GROUP_H_
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| 35 |
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| 36 | #include <libblock.h>
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| 37 | #include <sys/types.h>
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| 38 | #include "libext4_block_group.h"
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| 39 | /*
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| 40 | * Structure of a blocks group descriptor
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| 41 | */
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| 42 | typedef struct ext4_block_group {
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| 43 | uint32_t block_bitmap_lo; // Blocks bitmap block
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| 44 | uint32_t inode_bitmap_lo; // Inodes bitmap block
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| 45 | uint32_t inode_table_first_block_lo; // Inodes table block
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| 46 | uint16_t free_blocks_count_lo; // Free blocks count
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| 47 | uint16_t free_inodes_count_lo; // Free inodes count
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| 48 | uint16_t used_dirs_count_lo; // Directories count
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| 49 | uint16_t flags; // EXT4_BG_flags (INODE_UNINIT, etc)
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| 50 | uint32_t reserved[2]; // Likely block/inode bitmap checksum
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| 51 | uint16_t itable_unused_lo; // Unused inodes count
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| 52 | uint16_t checksum; // crc16(sb_uuid+group+desc)
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| 53 | /* -------------- */
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| 54 | uint32_t block_bitmap_hi; // Blocks bitmap block MSB
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| 55 | uint32_t inode_bitmap_hi; // Inodes bitmap block MSB
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| 56 | uint32_t inode_table_first_block_hi; // Inodes table block MSB
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| 57 | uint16_t free_blocks_count_hi; // Free blocks count MSB
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| 58 | uint16_t free_inodes_count_hi; // Free inodes count MSB
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| 59 | uint16_t used_dirs_count_hi; // Directories count MSB
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| 60 | uint16_t itable_unused_hi; // Unused inodes count MSB
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| 61 | uint32_t reserved2[3]; // Padding
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| 62 | } ext4_block_group_t;
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| 63 |
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| 64 | typedef struct ext4_block_group_ref {
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| 65 | block_t *block; // Reference to a block containing this block group descr
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| 66 | ext4_block_group_t *block_group;
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| 67 | } ext4_block_group_ref_t;
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| 68 |
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| 69 | #define EXT4_BLOCK_MIN_GROUP_DESCRIPTOR_SIZE 32
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| 70 |
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| 71 | extern uint64_t ext4_block_group_get_block_bitmap(ext4_block_group_t *);
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| 72 | extern uint64_t ext4_block_group_get_inode_bitmap(ext4_block_group_t *);
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| 73 | extern uint64_t ext4_block_group_get_inode_table_first_block(ext4_block_group_t *);
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| 74 | extern uint32_t ext4_block_group_get_free_blocks_count(ext4_block_group_t *);
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| 75 | extern void ext4_block_group_set_free_blocks_count(ext4_block_group_t *, uint32_t);
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| 76 | extern uint32_t ext4_block_group_get_free_inodes_count(ext4_block_group_t *);
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| 77 | extern uint32_t ext4_block_group_get_used_dirs_count(ext4_block_group_t *);
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| 78 | extern uint16_t ext4_block_group_get_flags(ext4_block_group_t *);
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| 79 | extern uint32_t ext4_block_group_get_itable_unused(ext4_block_group_t *);
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| 80 | extern uint16_t ext4_block_group_get_checksum(ext4_block_group_t *);
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| 81 |
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| 82 | #endif
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| 83 |
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| 84 | /**
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| 85 | * @}
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| 86 | */
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