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bigbiff bigbiffe60683a2013-02-22 20:55:50 -05001/*
2 * Copyright (C) 2009 Karel Zak <kzak@redhat.com>
3 *
4 * This file may be redistributed under the terms of the
5 * GNU Lesser General Public License.
6 */
7#include <stdio.h>
8#include <stdlib.h>
9#include <unistd.h>
10#include <string.h>
11#include <stdint.h>
12
13#include "superblocks.h"
14
15struct btrfs_super_block {
16 uint8_t csum[32];
17 uint8_t fsid[16];
18 uint64_t bytenr;
19 uint64_t flags;
20 uint8_t magic[8];
21 uint64_t generation;
22 uint64_t root;
23 uint64_t chunk_root;
24 uint64_t log_root;
25 uint64_t log_root_transid;
26 uint64_t total_bytes;
27 uint64_t bytes_used;
28 uint64_t root_dir_objectid;
29 uint64_t num_devices;
30 uint32_t sectorsize;
31 uint32_t nodesize;
32 uint32_t leafsize;
33 uint32_t stripesize;
34 uint32_t sys_chunk_array_size;
35 uint64_t chunk_root_generation;
36 uint64_t compat_flags;
37 uint64_t compat_ro_flags;
38 uint64_t incompat_flags;
39 uint16_t csum_type;
40 uint8_t root_level;
41 uint8_t chunk_root_level;
42 uint8_t log_root_level;
43 struct btrfs_dev_item {
44 uint64_t devid;
45 uint64_t total_bytes;
46 uint64_t bytes_used;
47 uint32_t io_align;
48 uint32_t io_width;
49 uint32_t sector_size;
50 uint64_t type;
51 uint64_t generation;
52 uint64_t start_offset;
53 uint32_t dev_group;
54 uint8_t seek_speed;
55 uint8_t bandwidth;
56 uint8_t uuid[16];
57 uint8_t fsid[16];
58 } __attribute__ ((__packed__)) dev_item;
59 uint8_t label[256];
60} __attribute__ ((__packed__));
61
62static int probe_btrfs(blkid_probe pr, const struct blkid_idmag *mag)
63{
64 struct btrfs_super_block *bfs;
65
bigbiff bigbiffe60683a2013-02-22 20:55:50 -050066 bfs = blkid_probe_get_sb(pr, mag, struct btrfs_super_block);
67 if (!bfs)
bigbiff7b4c7a62015-01-01 19:44:14 -050068 return errno ? -errno : 1;
bigbiff bigbiffe60683a2013-02-22 20:55:50 -050069
70 if (*bfs->label)
71 blkid_probe_set_label(pr,
72 (unsigned char *) bfs->label,
73 sizeof(bfs->label));
74
75 blkid_probe_set_uuid(pr, bfs->fsid);
76 blkid_probe_set_uuid_as(pr, bfs->dev_item.uuid, "UUID_SUB");
77
78 return 0;
79}
80
81const struct blkid_idinfo btrfs_idinfo =
82{
83 .name = "btrfs",
84 .usage = BLKID_USAGE_FILESYSTEM,
85 .probefunc = probe_btrfs,
86 .minsz = 1024 * 1024,
87 .magics =
88 {
89 { .magic = "_BHRfS_M", .len = 8, .sboff = 0x40, .kboff = 64 },
bigbiff bigbiffe60683a2013-02-22 20:55:50 -050090 { NULL }
91 }
92};
93