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
volume_id_probe_minix(struct volume_id * id)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 }
92