163 lines
4.2 KiB
C
163 lines
4.2 KiB
C
/*
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File: btrfs.h
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Copyright (C) 2011 Christophe GRENIER <grenier@cgsecurity.org>
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This software is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with this program; if not, write the Free Software Foundation, Inc., 51
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Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef _BTRFS_H
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#define _BTRFS_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define BTRFS_SUPER_INFO_OFFSET (64 * 1024)
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#define BTRFS_SUPER_INFO_SIZE 4096
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#define BTRFS_SUPER_MIRROR_MAX 3
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#define BTRFS_SUPER_MIRROR_SHIFT 12
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#define BTRFS_MAGIC "_BHRfS_M"
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#define BTRFS_FSID_SIZE 16
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/* 32 bytes in various csum fields */
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#define BTRFS_CSUM_SIZE 32
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/*
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* this is a very generous portion of the super block, giving us
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* room to translate 14 chunks with 3 stripes each.
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*/
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#define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048
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#define BTRFS_LABEL_SIZE 256
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/*
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* Structure of the super block
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* Check http://git.kernel.org/?p=linux/kernel/git/mason/btrfs-progs-unstable.git;a=blob;f=ctree.h;hb=HEAD
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* for an up-to-date version
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* Fields are in low endian
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*/
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#define BTRFS_UUID_SIZE 16
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struct btrfs_dev_item {
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/* the internal btrfs device id */
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uint64_t devid;
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/* size of the device */
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uint64_t total_bytes;
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/* bytes used */
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uint64_t bytes_used;
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/* optimal io alignment for this device */
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uint32_t io_align;
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/* optimal io width for this device */
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uint32_t io_width;
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/* minimal io size for this device */
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uint32_t sector_size;
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/* type and info about this device */
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uint64_t type;
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/* expected generation for this device */
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uint64_t generation;
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/*
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* starting byte of this partition on the device,
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* to allowr for stripe alignment in the future
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*/
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uint64_t start_offset;
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/* grouping information for allocation decisions */
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uint32_t dev_group;
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/* seek speed 0-100 where 100 is fastest */
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uint8_t seek_speed;
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/* bandwidth 0-100 where 100 is fastest */
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uint8_t bandwidth;
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/* btrfs generated uuid for this device */
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uint8_t uuid[BTRFS_UUID_SIZE];
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/* uuid of FS who owns this device */
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uint8_t fsid[BTRFS_UUID_SIZE];
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} __attribute__ ((gcc_struct, __packed__));
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struct btrfs_super_block {
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uint8_t csum[BTRFS_CSUM_SIZE];
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/* the first 3 fields must match struct btrfs_header */
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uint8_t fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
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uint64_t bytenr; /* this block number */
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uint64_t flags;
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/* allowed to be different from the btrfs_header from here own down */
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uint64_t magic;
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uint64_t generation;
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uint64_t root;
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uint64_t chunk_root;
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uint64_t log_root;
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/* this will help find the new super based on the log root */
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uint64_t log_root_transid;
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uint64_t total_bytes;
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uint64_t bytes_used;
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uint64_t root_dir_objectid;
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uint64_t num_devices;
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uint32_t sectorsize;
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uint32_t nodesize;
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uint32_t leafsize;
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uint32_t stripesize;
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uint32_t sys_chunk_array_size;
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uint64_t chunk_root_generation;
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uint64_t compat_flags;
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uint64_t compat_ro_flags;
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uint64_t incompat_flags;
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uint16_t csum_type;
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uint8_t root_level;
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uint8_t chunk_root_level;
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uint8_t log_root_level;
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struct btrfs_dev_item dev_item;
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char label[BTRFS_LABEL_SIZE];
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/* future expansion */
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uint64_t reserved[32];
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uint8_t sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE];
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} __attribute__ ((gcc_struct, __packed__));
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/*@
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@ requires \valid(disk_car);
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@ requires valid_disk(disk_car);
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@ requires \valid(partition);
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@ requires \separated(disk_car, partition);
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@ decreases 0;
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@*/
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int check_btrfs(disk_t *disk_car, partition_t *partition);
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/*@
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@ requires \valid(disk_car);
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@ requires valid_disk(disk_car);
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@ requires \valid(partition);
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@ requires \separated(disk_car, sb, partition);
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@*/
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int recover_btrfs(const disk_t *disk_car, const struct btrfs_super_block *sb,partition_t *partition,const int verbose, const int dump_ind);
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#ifdef __cplusplus
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} /* closing brace for extern "C" */
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#endif
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#endif
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