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
32struct 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
63struct 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
92int 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
130found:
131	volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
132	return 0;
133}
134