| Denys Vlasenko | 73c47f6 | 2017-07-25 14:22:08 +0200 | [diff] [blame] | 1 | /* |
| 2 | * volume_id - reads filesystem label and uuid |
| 3 | * |
| 4 | * Copyright (C) 2005 Kay Sievers <kay.sievers@vrfy.org> |
| 5 | * |
| 6 | * This library is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU Lesser General Public |
| 8 | * License as published by the Free Software Foundation; either |
| 9 | * version 2.1 of the License, or (at your option) any later version. |
| 10 | * |
| 11 | * This library is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 14 | * Lesser General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU Lesser General Public |
| 17 | * License along with this library; if not, write to the Free Software |
| 18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 19 | */ |
| 20 | //config:config FEATURE_VOLUMEID_MINIX |
| 21 | //config: bool "minix filesystem" |
| 22 | //config: default y |
| 23 | //config: depends on VOLUMEID |
| 24 | |
| 25 | //kbuild:lib-$(CONFIG_FEATURE_VOLUMEID_MINIX) += minix.o |
| 26 | |
| 27 | #include "volume_id_internal.h" |
| 28 | |
| 29 | struct minix_super_block { |
| 30 | uint16_t s_ninodes; |
| 31 | uint16_t s_nzones; |
| 32 | uint16_t s_imap_blocks; |
| 33 | uint16_t s_zmap_blocks; |
| 34 | uint16_t s_firstdatazone; |
| 35 | uint16_t s_log_zone_size; |
| 36 | uint32_t s_max_size; |
| 37 | uint16_t s_magic; |
| 38 | uint16_t s_state; |
| 39 | uint32_t s_zones; |
| 40 | } PACKED; |
| 41 | |
| 42 | /* V3 minix super-block data on disk */ |
| 43 | struct minix3_super_block { |
| 44 | uint32_t s_ninodes; |
| 45 | uint16_t s_pad0; |
| 46 | uint16_t s_imap_blocks; |
| 47 | uint16_t s_zmap_blocks; |
| 48 | uint16_t s_firstdatazone; |
| 49 | uint16_t s_log_zone_size; |
| 50 | uint16_t s_pad1; |
| 51 | uint32_t s_max_size; |
| 52 | uint32_t s_zones; |
| 53 | uint16_t s_magic; |
| 54 | uint16_t s_pad2; |
| 55 | uint16_t s_blocksize; |
| 56 | uint8_t s_disk_version; |
| 57 | } PACKED; |
| 58 | |
| 59 | #define MINIX_SUPERBLOCK_OFFSET 0x400 |
| 60 | |
| 61 | int FAST_FUNC volume_id_probe_minix(struct volume_id *id /*, uint64_t off*/) |
| 62 | { |
| 63 | #define off ((uint64_t)0) |
| 64 | struct minix_super_block *ms; |
| 65 | struct minix3_super_block *ms3; |
| 66 | |
| 67 | dbg("probing at offset 0x%llx", (unsigned long long) off); |
| 68 | |
| 69 | ms = volume_id_get_buffer(id, off + MINIX_SUPERBLOCK_OFFSET, 0x200); |
| 70 | if (ms == NULL) |
| 71 | return -1; |
| 72 | if (ms->s_magic == cpu_to_le16(0x137F)) /* minix V1 fs, 14 char names */ |
| 73 | goto found; |
| 74 | if (ms->s_magic == cpu_to_le16(0x138F)) /* minix V1 fs, 30 char names */ |
| 75 | goto found; |
| 76 | if (ms->s_magic == cpu_to_le16(0x2468)) /* minix V2 fs, 14 char names */ |
| 77 | goto found; |
| 78 | if (ms->s_magic == cpu_to_le16(0x2478)) /* minix V2 fs, 30 char names */ |
| 79 | goto found; |
| 80 | |
| 81 | ms3 = (void*)ms; |
| 82 | if (ms3->s_magic == cpu_to_le16(0x4d5a)) /* minix V3 fs, 60 char names */ |
| 83 | goto found; |
| 84 | |
| 85 | return -1; |
| 86 | |
| 87 | found: |
| 88 | // volume_id_set_usage(id, VOLUME_ID_FILESYSTEM); |
| 89 | IF_FEATURE_BLKID_TYPE(id->type = "minix";) |
| 90 | return 0; |
| 91 | } |