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 bfs = blkid_probe_get_sb(pr, mag, struct btrfs_super_block); 67 if (!bfs) 68 return errno ? -errno : 1; 69 70 if (*bfs->label) 71 blkid_probe_set_label(pr, 72 (unsigned char *) bfs->label, 73 sizeof(bfs->label) - 1); 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 81 const 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 }, 90 { NULL } 91 } 92 }; 93 94
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