1 /*
2 * volume_id - reads filesystem label and uuid
3 *
4 * Copyright (C) 2005 Kay Sievers <kay.sievers@vrfy.org>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation version 2 of the License.
9 */
10
11 #ifndef _GNU_SOURCE
12 #define _GNU_SOURCE 1
13 #endif
14
15 #ifdef HAVE_CONFIG_H
16 # include <config.h>
17 #endif
18
19 #include <stdio.h>
20 #include <stdlib.h>
21 #include <unistd.h>
22 #include <string.h>
23 #include <errno.h>
24 #include <ctype.h>
25
26 #include "libvolume_id.h"
27 #include "util.h"
28
29 #define SYSV_NICINOD 100
30 #define SYSV_NICFREE 50
31
32 struct sysv_super
33 {
34 uint16_t s_isize;
35 uint16_t s_pad0;
36 uint32_t s_fsize;
37 uint16_t s_nfree;
38 uint16_t s_pad1;
39 uint32_t s_free[SYSV_NICFREE];
40 uint16_t s_ninode;
41 uint16_t s_pad2;
42 uint16_t s_inode[SYSV_NICINOD];
43 uint8_t s_flock;
44 uint8_t s_ilock;
45 uint8_t s_fmod;
46 uint8_t s_ronly;
47 uint32_t s_time;
48 uint16_t s_dinfo[4];
49 uint32_t s_tfree;
50 uint16_t s_tinode;
51 uint16_t s_pad3;
52 uint8_t s_fname[6];
53 uint8_t s_fpack[6];
54 uint32_t s_fill[12];
55 uint32_t s_state;
56 uint32_t s_magic;
57 uint32_t s_type;
58 } PACKED;
59
60 #define XENIX_NICINOD 100
61 #define XENIX_NICFREE 100
62
63 struct xenix_super {
64 uint16_t s_isize;
65 uint32_t s_fsize;
66 uint16_t s_nfree;
67 uint32_t s_free[XENIX_NICFREE];
68 uint16_t s_ninode;
69 uint16_t s_inode[XENIX_NICINOD];
70 uint8_t s_flock;
71 uint8_t s_ilock;
72 uint8_t s_fmod;
73 uint8_t s_ronly;
74 uint32_t s_time;
75 uint32_t s_tfree;
76 uint16_t s_tinode;
77 uint16_t s_dinfo[4];
78 uint8_t s_fname[6];
79 uint8_t s_fpack[6];
80 uint8_t s_clean;
81 uint8_t s_fill[371];
82 uint32_t s_magic;
83 uint32_t s_type;
84 } PACKED;
85
86 #define SYSV_SUPERBLOCK_BLOCK 0x01
87 #define SYSV_MAGIC 0xfd187e20
88 #define XENIX_SUPERBLOCK_BLOCK 0x18
89 #define XENIX_MAGIC 0x2b5544
90 #define SYSV_MAX_BLOCKSIZE 0x800
91
volume_id_probe_sysv(struct volume_id * id,uint64_t off,uint64_t size)92 int volume_id_probe_sysv(struct volume_id *id, uint64_t off, uint64_t size)
93 {
94 struct sysv_super *vs;
95 struct xenix_super *xs;
96 unsigned int boff;
97
98 info("probing at offset 0x%llx", (unsigned long long) off);
99
100 for (boff = 0x200; boff <= SYSV_MAX_BLOCKSIZE; boff <<= 1) {
101 vs = (struct sysv_super *)
102 volume_id_get_buffer(id, off + (boff * SYSV_SUPERBLOCK_BLOCK), 0x200);
103 if (vs == NULL)
104 return -1;
105
106 if (vs->s_magic == cpu_to_le32(SYSV_MAGIC) || vs->s_magic == cpu_to_be32(SYSV_MAGIC)) {
107 volume_id_set_label_raw(id, vs->s_fname, 6);
108 volume_id_set_label_string(id, vs->s_fname, 6);
109 id->type = "sysv";
110 goto found;
111 }
112 }
113
114 for (boff = 0x200; boff <= SYSV_MAX_BLOCKSIZE; boff <<= 1) {
115 xs = (struct xenix_super *)
116 volume_id_get_buffer(id, off + (boff + XENIX_SUPERBLOCK_BLOCK), 0x200);
117 if (xs == NULL)
118 return -1;
119
120 if (xs->s_magic == cpu_to_le32(XENIX_MAGIC) || xs->s_magic == cpu_to_be32(XENIX_MAGIC)) {
121 volume_id_set_label_raw(id, xs->s_fname, 6);
122 volume_id_set_label_string(id, xs->s_fname, 6);
123 id->type = "xenix";
124 goto found;
125 }
126 }
127
128 return -1;
129
130 found:
131 volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
132 return 0;
133 }
134