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93 lines
2.4 KiB
C
93 lines
2.4 KiB
C
/*
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* volume_id - reads filesystem label and uuid
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*
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* Copyright (C) 2008 Kay Sievers <kay.sievers@vrfy.org>
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*
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* This program 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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*
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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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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef _GNU_SOURCE
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#define _GNU_SOURCE 1
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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#include <ctype.h>
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#include <byteswap.h>
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#include "libvolume_id.h"
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#include "libvolume_id-private.h"
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struct btrfs_super_block {
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uint8_t csum[32];
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uint8_t fsid[16];
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uint64_t bytenr;
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uint64_t flags;
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uint8_t magic[8];
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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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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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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 {
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uint64_t devid;
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uint64_t total_bytes;
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uint64_t bytes_used;
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uint32_t io_align;
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uint32_t io_width;
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uint32_t sector_size;
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uint64_t type;
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uint32_t dev_group;
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uint8_t seek_speed;
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uint8_t bandwidth;
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uint8_t uuid[16];
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} PACKED dev_item;
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uint8_t label[256];
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} PACKED;
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int volume_id_probe_btrfs(struct volume_id *id, uint64_t off, uint64_t size)
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{
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const uint8_t *buf;
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struct btrfs_super_block *bfs;
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info("probing at offset 0x%" PRIx64 ", size 0x%" PRIx64 "\n", off, size);
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buf = volume_id_get_buffer(id, off + 0x4000, 0x200);
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if (buf == NULL)
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return -1;
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bfs = (struct btrfs_super_block *)buf;
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if (memcmp(bfs->magic, "_BBRfS_M", 8) != 0)
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return -1;
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volume_id_set_uuid(id, bfs->fsid, 0, UUID_DCE);
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volume_id_set_label_raw(id, bfs->label, 256);
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volume_id_set_label_string(id, bfs->label, 256);
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volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
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id->type = "btrfs";
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return 0;
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}
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