| bigbiff bigbiff | e60683a | 2013-02-22 20:55:50 -0500 | [diff] [blame] | 1 | /* |
| 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 | |
| 15 | struct 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 | |
| 62 | static int probe_btrfs(blkid_probe pr, const struct blkid_idmag *mag) |
| 63 | { |
| 64 | struct btrfs_super_block *bfs; |
| 65 | |
| 66 | if (mag->kboff > 64 && blkid_probe_ignore_backup(pr)) { |
| 67 | DBG(DEBUG_LOWPROBE, printf("btrfs: found backup superblock, ignore\n")); |
| 68 | return 1; |
| 69 | } |
| 70 | |
| 71 | bfs = blkid_probe_get_sb(pr, mag, struct btrfs_super_block); |
| 72 | if (!bfs) |
| 73 | return -1; |
| 74 | |
| 75 | if (*bfs->label) |
| 76 | blkid_probe_set_label(pr, |
| 77 | (unsigned char *) bfs->label, |
| 78 | sizeof(bfs->label)); |
| 79 | |
| 80 | blkid_probe_set_uuid(pr, bfs->fsid); |
| 81 | blkid_probe_set_uuid_as(pr, bfs->dev_item.uuid, "UUID_SUB"); |
| 82 | |
| 83 | return 0; |
| 84 | } |
| 85 | |
| 86 | const struct blkid_idinfo btrfs_idinfo = |
| 87 | { |
| 88 | .name = "btrfs", |
| 89 | .usage = BLKID_USAGE_FILESYSTEM, |
| 90 | .probefunc = probe_btrfs, |
| 91 | .minsz = 1024 * 1024, |
| 92 | .magics = |
| 93 | { |
| 94 | { .magic = "_BHRfS_M", .len = 8, .sboff = 0x40, .kboff = 64 }, |
| 95 | { .magic = "_BHRfS_M", .len = 8, .sboff = 0x40, .kboff = 64 * 1024 }, |
| 96 | { .magic = "_BHRfS_M", .len = 8, .sboff = 0x40, .kboff = 256 * 1024 * 1024 }, |
| 97 | { NULL } |
| 98 | } |
| 99 | }; |
| 100 | |