| /* |
| * 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; |
| |
| 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, .kboff = 64, .sboff = 0x40 }, |
| { NULL } |
| } |
| }; |
| |