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