1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
|
/*-
* Copyright (c) 2003 Jake Burkholder
* Copyright (c) 2003 Poul-Henning Kamp
* Copyright (c) 2004 Joerg Wunsch
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* Functions to encode or decode struct sun_disklabel into a bytestream
* of correct endianess and packing.
*
* NB! This file must be usable both in kernel and userland.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/types.h>
#include <sys/endian.h>
#include <sys/errno.h>
#include <sys/sun_disklabel.h>
#define SL_TEXT 0x0
#define SL_TEXT_SIZEOF 0x80
#define SL_VTOC_VERS 0x80
#define SL_VTOC_NPART 0x8c
#define SL_VTOC_MAP 0x8e
#define SL_VTOC_SANITY 0xbc
#define SL_RPM 0x1a4
#define SL_PCYLINDERS 0x1a6
#define SL_SPARESPERCYL 0x1a8
#define SL_INTERLEAVE 0x1ae
#define SL_NCYLINDERS 0x1b0
#define SL_ACYLINDERS 0x1b2
#define SL_NTRACKS 0x1b4
#define SL_NSECTORS 0x1b6
#define SL_PART 0x1bc
#define SL_MAGIC 0x1fc
#define SL_CKSUM 0x1fe
#define SDKP_CYLOFFSET 0
#define SDKP_NSECTORS 0x4
#define SDKP_SIZEOF 0x8 /* size of a partition entry */
#define SVTOC_TAG 0
#define SVTOC_FLAG 0x2
#define SVTOC_SIZEOF 0x4 /* size of a VTOC tag/flag entry */
/*
* Decode the relevant fields of a sun disk label, and return zero if the
* magic and checksum works out OK.
*/
int
sunlabel_dec(void const *pp, struct sun_disklabel *sl)
{
const uint8_t *p;
size_t i;
u_int u;
uint32_t vtocsane;
uint16_t npart;
p = pp;
for (i = 0; i < sizeof(sl->sl_text); i++)
sl->sl_text[i] = p[SL_TEXT + i];
sl->sl_rpm = be16dec(p + SL_RPM);
sl->sl_pcylinders = be16dec(p + SL_PCYLINDERS);
sl->sl_sparespercyl = be16dec(p + SL_SPARESPERCYL);
sl->sl_interleave = be16dec(p + SL_INTERLEAVE);
sl->sl_ncylinders = be16dec(p + SL_NCYLINDERS);
sl->sl_acylinders = be16dec(p + SL_ACYLINDERS);
sl->sl_ntracks = be16dec(p + SL_NTRACKS);
sl->sl_nsectors = be16dec(p + SL_NSECTORS);
for (i = 0; i < SUN_NPART; i++) {
sl->sl_part[i].sdkp_cyloffset = be32dec(p + SL_PART +
(i * SDKP_SIZEOF) + SDKP_CYLOFFSET);
sl->sl_part[i].sdkp_nsectors = be32dec(p + SL_PART +
(i * SDKP_SIZEOF) + SDKP_NSECTORS);
}
sl->sl_magic = be16dec(p + SL_MAGIC);
vtocsane = be32dec(p + SL_VTOC_SANITY);
npart = be16dec(p + SL_VTOC_NPART);
if (vtocsane == SUN_VTOC_SANE && npart == SUN_NPART) {
/*
* Seems we've got SVR4-compatible VTOC information
* as well, decode it.
*/
sl->sl_vtoc_sane = vtocsane;
sl->sl_vtoc_vers = be32dec(p + SL_VTOC_VERS);
sl->sl_vtoc_nparts = SUN_NPART;
for (i = 0; i < SUN_NPART; i++) {
sl->sl_vtoc_map[i].svtoc_tag = be16dec(p +
SL_VTOC_MAP + (i * SVTOC_SIZEOF) + SVTOC_TAG);
sl->sl_vtoc_map[i].svtoc_flag = be16dec(p +
SL_VTOC_MAP + (i * SVTOC_SIZEOF) + SVTOC_FLAG);
}
}
for (i = u = 0; i < SUN_SIZE; i += 2)
u ^= be16dec(p + i);
if (u == 0 && sl->sl_magic == SUN_DKMAGIC)
return (0);
else
return (EINVAL);
}
/*
* Encode the relevant fields into a sun disklabel, compute new checksum.
*/
void
sunlabel_enc(void *pp, struct sun_disklabel *sl)
{
uint8_t *p;
size_t i;
u_int u;
p = pp;
for (i = 0; i < SL_TEXT_SIZEOF; i++)
p[SL_TEXT + i] = sl->sl_text[i];
be16enc(p + SL_RPM, sl->sl_rpm);
be16enc(p + SL_PCYLINDERS, sl->sl_pcylinders);
be16enc(p + SL_SPARESPERCYL, sl->sl_sparespercyl);
be16enc(p + SL_INTERLEAVE, sl->sl_interleave);
be16enc(p + SL_NCYLINDERS, sl->sl_ncylinders);
be16enc(p + SL_ACYLINDERS, sl->sl_acylinders);
be16enc(p + SL_NTRACKS, sl->sl_ntracks);
be16enc(p + SL_NSECTORS, sl->sl_nsectors);
for (i = 0; i < SUN_NPART; i++) {
be32enc(p + SL_PART + (i * SDKP_SIZEOF) + SDKP_CYLOFFSET,
sl->sl_part[i].sdkp_cyloffset);
be32enc(p + SL_PART + (i * SDKP_SIZEOF) + SDKP_NSECTORS,
sl->sl_part[i].sdkp_nsectors);
}
be16enc(p + SL_MAGIC, sl->sl_magic);
if (sl->sl_vtoc_sane == SUN_VTOC_SANE
&& sl->sl_vtoc_nparts == SUN_NPART) {
/*
* Write SVR4-compatible VTOC elements.
*/
be32enc(p + SL_VTOC_VERS, sl->sl_vtoc_vers);
be32enc(p + SL_VTOC_SANITY, SUN_VTOC_SANE);
be16enc(p + SL_VTOC_NPART, SUN_NPART);
for (i = 0; i < SUN_NPART; i++) {
be16enc(p + SL_VTOC_MAP + (i * SVTOC_SIZEOF)
+ SVTOC_TAG,
sl->sl_vtoc_map[i].svtoc_tag);
be16enc(p + SL_VTOC_MAP + (i * SVTOC_SIZEOF)
+ SVTOC_FLAG,
sl->sl_vtoc_map[i].svtoc_flag);
}
}
for (i = u = 0; i < SUN_SIZE; i += 2)
u ^= be16dec(p + i);
be16enc(p + SL_CKSUM, u);
}
|
