| Denis Vlasenko | de7684a | 2008-02-18 21:08:49 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * volume_id - reads filesystem label and uuid |
| 3 | * |
| 4 | * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org> |
| 5 | * Copyright (C) 2005 Tobias Klauser <tklauser@access.unizh.ch> |
| 6 | * |
| 7 | * This library is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU Lesser General Public |
| 9 | * License as published by the Free Software Foundation; either |
| 10 | * version 2.1 of the License, or (at your option) any later version. |
| 11 | * |
| 12 | * This library is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 15 | * Lesser General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU Lesser General Public |
| 18 | * License along with this library; if not, write to the Free Software |
| 19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 20 | */ |
| 21 | |
| 22 | #include "volume_id_internal.h" |
| 23 | |
| 24 | struct reiserfs_super_block { |
| 25 | uint32_t blocks_count; |
| 26 | uint32_t free_blocks; |
| 27 | uint32_t root_block; |
| 28 | uint32_t journal_block; |
| 29 | uint32_t journal_dev; |
| 30 | uint32_t orig_journal_size; |
| 31 | uint32_t dummy2[5]; |
| 32 | uint16_t blocksize; |
| 33 | uint16_t dummy3[3]; |
| 34 | uint8_t magic[12]; |
| 35 | uint32_t dummy4[5]; |
| 36 | uint8_t uuid[16]; |
| 37 | uint8_t label[16]; |
| 38 | } __attribute__((__packed__)); |
| 39 | |
| 40 | struct reiser4_super_block { |
| 41 | uint8_t magic[16]; |
| 42 | uint16_t dummy[2]; |
| 43 | uint8_t uuid[16]; |
| 44 | uint8_t label[16]; |
| 45 | uint64_t dummy2; |
| 46 | } __attribute__((__packed__)); |
| 47 | |
| 48 | #define REISERFS1_SUPERBLOCK_OFFSET 0x2000 |
| 49 | #define REISERFS_SUPERBLOCK_OFFSET 0x10000 |
| 50 | |
| 51 | int volume_id_probe_reiserfs(struct volume_id *id, uint64_t off) |
| 52 | { |
| 53 | struct reiserfs_super_block *rs; |
| 54 | struct reiser4_super_block *rs4; |
| 55 | |
| 56 | dbg("probing at offset 0x%llx", (unsigned long long) off); |
| 57 | |
| 58 | rs = volume_id_get_buffer(id, off + REISERFS_SUPERBLOCK_OFFSET, 0x200); |
| 59 | if (rs == NULL) |
| 60 | return -1; |
| 61 | |
| 62 | if (memcmp(rs->magic, "ReIsErFs", 8) == 0) { |
| 63 | strcpy(id->type_version, "3.5"); |
| 64 | goto found; |
| 65 | } |
| 66 | if (memcmp(rs->magic, "ReIsEr2Fs", 9) == 0) { |
| 67 | strcpy(id->type_version, "3.6"); |
| 68 | goto found_label; |
| 69 | } |
| 70 | if (memcmp(rs->magic, "ReIsEr3Fs", 9) == 0) { |
| 71 | strcpy(id->type_version, "JR"); |
| 72 | goto found_label; |
| 73 | } |
| 74 | |
| 75 | rs4 = (struct reiser4_super_block *) rs; |
| 76 | if (memcmp(rs4->magic, "ReIsEr4", 7) == 0) { |
| 77 | strcpy(id->type_version, "4"); |
| 78 | volume_id_set_label_raw(id, rs4->label, 16); |
| 79 | volume_id_set_label_string(id, rs4->label, 16); |
| 80 | volume_id_set_uuid(id, rs4->uuid, UUID_DCE); |
| 81 | goto found; |
| 82 | } |
| 83 | |
| 84 | rs = volume_id_get_buffer(id, off + REISERFS1_SUPERBLOCK_OFFSET, 0x200); |
| 85 | if (rs == NULL) |
| 86 | return -1; |
| 87 | |
| 88 | if (memcmp(rs->magic, "ReIsErFs", 8) == 0) { |
| 89 | strcpy(id->type_version, "3.5"); |
| 90 | goto found; |
| 91 | } |
| 92 | |
| 93 | return -1; |
| 94 | |
| 95 | found_label: |
| 96 | volume_id_set_label_raw(id, rs->label, 16); |
| 97 | volume_id_set_label_string(id, rs->label, 16); |
| 98 | volume_id_set_uuid(id, rs->uuid, UUID_DCE); |
| 99 | |
| 100 | found: |
| 101 | volume_id_set_usage(id, VOLUME_ID_FILESYSTEM); |
| 102 | id->type = "reiserfs"; |
| 103 | |
| 104 | return 0; |
| 105 | } |