chiark / gitweb /
Remove the udev.spec file as no one uses it anymore
[elogind.git] / extras / volume_id / volume_id / sysv.c
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
21 #ifndef _GNU_SOURCE
22 #define _GNU_SOURCE 1
23 #endif
24
25 #ifdef HAVE_CONFIG_H
26 #  include <config.h>
27 #endif
28
29 #include <stdio.h>
30 #include <stdlib.h>
31 #include <unistd.h>
32 #include <string.h>
33 #include <errno.h>
34 #include <ctype.h>
35 #include <asm/types.h>
36
37 #include "volume_id.h"
38 #include "logging.h"
39 #include "util.h"
40 #include "sysv.h"
41
42 #define SYSV_NICINOD                    100
43 #define SYSV_NICFREE                    50
44
45 struct sysv_super
46 {
47         uint16_t        s_isize;
48         uint16_t        s_pad0;
49         uint32_t        s_fsize;
50         uint16_t        s_nfree;
51         uint16_t        s_pad1;
52         uint32_t        s_free[SYSV_NICFREE];
53         uint16_t        s_ninode;
54         uint16_t        s_pad2;
55         uint16_t        s_inode[SYSV_NICINOD];
56         uint8_t         s_flock;
57         uint8_t         s_ilock;
58         uint8_t         s_fmod;
59         uint8_t         s_ronly;
60         uint32_t        s_time;
61         uint16_t        s_dinfo[4];
62         uint32_t        s_tfree;
63         uint16_t        s_tinode;
64         uint16_t        s_pad3;
65         uint8_t         s_fname[6];
66         uint8_t         s_fpack[6];
67         uint32_t        s_fill[12];
68         uint32_t        s_state;
69         uint32_t        s_magic;
70         uint32_t        s_type;
71 } __attribute__((__packed__));
72
73 #define XENIX_NICINOD                           100
74 #define XENIX_NICFREE                           100
75
76 struct xenix_super {
77         uint16_t        s_isize;
78         uint32_t        s_fsize;
79         uint16_t        s_nfree;
80         uint32_t        s_free[XENIX_NICFREE];
81         uint16_t        s_ninode;
82         uint16_t        s_inode[XENIX_NICINOD];
83         uint8_t         s_flock;
84         uint8_t         s_ilock;
85         uint8_t         s_fmod;
86         uint8_t         s_ronly;
87         uint32_t        s_time;
88         uint32_t        s_tfree;
89         uint16_t        s_tinode;
90         uint16_t        s_dinfo[4];
91         uint8_t         s_fname[6];
92         uint8_t         s_fpack[6];
93         uint8_t         s_clean;
94         uint8_t         s_fill[371];
95         uint32_t        s_magic;
96         uint32_t        s_type;
97 } __attribute__((__packed__));
98
99 #define SYSV_SUPERBLOCK_BLOCK                   0x01
100 #define SYSV_MAGIC                              0xfd187e20
101 #define XENIX_SUPERBLOCK_BLOCK                  0x18
102 #define XENIX_MAGIC                             0x2b5544
103 #define SYSV_MAX_BLOCKSIZE                      0x800
104
105 int volume_id_probe_sysv(struct volume_id *id, uint64_t off)
106 {
107         struct sysv_super *vs;
108         struct xenix_super *xs;
109         unsigned int boff;
110
111         dbg("probing at offset 0x%llx", (unsigned long long) off);
112
113         for (boff = 0x200; boff <= SYSV_MAX_BLOCKSIZE; boff <<= 1) {
114                 vs = (struct sysv_super *)
115                         volume_id_get_buffer(id, off + (boff * SYSV_SUPERBLOCK_BLOCK), 0x200);
116                 if (vs == NULL)
117                         return -1;
118
119                 if (vs->s_magic == cpu_to_le32(SYSV_MAGIC) || vs->s_magic == cpu_to_be32(SYSV_MAGIC)) {
120                         volume_id_set_label_raw(id, vs->s_fname, 6);
121                         volume_id_set_label_string(id, vs->s_fname, 6);
122                         id->type = "sysv";
123                         goto found;
124                 }
125         }
126
127         for (boff = 0x200; boff <= SYSV_MAX_BLOCKSIZE; boff <<= 1) {
128                 xs = (struct xenix_super *)
129                         volume_id_get_buffer(id, off + (boff + XENIX_SUPERBLOCK_BLOCK), 0x200);
130                 if (xs == NULL)
131                         return -1;
132
133                 if (xs->s_magic == cpu_to_le32(XENIX_MAGIC) || xs->s_magic == cpu_to_be32(XENIX_MAGIC)) {
134                         volume_id_set_label_raw(id, xs->s_fname, 6);
135                         volume_id_set_label_string(id, xs->s_fname, 6);
136                         id->type = "xenix";
137                         goto found;
138                 }
139         }
140
141         return -1;
142
143 found:
144         volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
145         return 0;
146 }