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/*
* Copyright (C) 2009 Karel Zak <kzak@redhat.com>
*
* This file may be redistributed under the terms of the
* GNU Lesser General Public License.
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <stdint.h>
#include "superblocks.h"
struct btrfs_super_block {
uint8_t csum[32];
uint8_t fsid[16];
uint64_t bytenr;
uint64_t flags;
uint8_t magic[8];
uint64_t generation;
uint64_t root;
uint64_t chunk_root;
uint64_t 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 {
uint64_t devid;
uint64_t total_bytes;
uint64_t bytes_used;
uint32_t io_align;
uint32_t io_width;
uint32_t sector_size;
uint64_t type;
uint64_t generation;
uint64_t start_offset;
uint32_t dev_group;
uint8_t seek_speed;
uint8_t bandwidth;
uint8_t uuid[16];
uint8_t fsid[16];
} __attribute__ ((__packed__)) dev_item;
uint8_t label[256];
} __attribute__ ((__packed__));
static int probe_btrfs(blkid_probe pr, const struct blkid_idmag *mag)
{
struct btrfs_super_block *bfs;
if (mag->kboff > 64 && blkid_probe_ignore_backup(pr)) {
DBG(DEBUG_LOWPROBE, printf("btrfs: found backup superblock, ignore\n"));
return 1;
}
bfs = blkid_probe_get_sb(pr, mag, struct btrfs_super_block);
if (!bfs)
return -1;
if (*bfs->label)
blkid_probe_set_label(pr,
(unsigned char *) bfs->label,
sizeof(bfs->label));
blkid_probe_set_uuid(pr, bfs->fsid);
blkid_probe_set_uuid_as(pr, bfs->dev_item.uuid, "UUID_SUB");
return 0;
}
const struct blkid_idinfo btrfs_idinfo =
{
.name = "btrfs",
.usage = BLKID_USAGE_FILESYSTEM,
.probefunc = probe_btrfs,
.minsz = 1024 * 1024,
.magics =
{
{ .magic = "_BHRfS_M", .len = 8, .sboff = 0x40, .kboff = 64 },
{ .magic = "_BHRfS_M", .len = 8, .sboff = 0x40, .kboff = 64 * 1024 },
{ .magic = "_BHRfS_M", .len = 8, .sboff = 0x40, .kboff = 256 * 1024 * 1024 },
{ NULL }
}
};
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