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