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
|
/* $OpenBSD: disksubr.c,v 1.61 2011/04/16 03:21:15 krw Exp $ */
/* $NetBSD: disksubr.c,v 1.21 1996/05/03 19:42:03 christos Exp $ */
/*
* Copyright (c) 1996 Theo de Raadt
* Copyright (c) 1982, 1986, 1988 Regents of the University of California.
* 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.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/buf.h>
#include <sys/disklabel.h>
#include <sys/disk.h>
#include <sys/reboot.h>
#include <sys/conf.h>
#include <machine/biosvar.h>
/*
* Attempt to read a disk label from a device
* using the indicated strategy routine.
* The label must be partly set up before this:
* secpercyl, secsize and anything required for a block i/o read
* operation in the driver's strategy/start routines
* must be filled in before calling us.
*
* If dos partition table requested, attempt to load it and
* find disklabel inside a DOS partition.
*
* We would like to check if each MBR has a valid DOSMBR_SIGNATURE, but
* we cannot because it doesn't always exist. So.. we assume the
* MBR is valid.
*/
int
readdisklabel(dev_t dev, void (*strat)(struct buf *),
struct disklabel *lp, int spoofonly)
{
bios_diskinfo_t *pdi;
struct buf *bp = NULL;
dev_t devno;
int error;
if ((error = initdisklabel(lp)))
goto done;
/* Look for any BIOS geometry information we should honour. */
devno = chrtoblk(dev);
if (devno == NODEV)
devno = dev;
pdi = bios_getdiskinfo(MAKEBOOTDEV(major(devno), 0, 0, DISKUNIT(devno),
RAW_PART));
if (pdi != NULL && pdi->bios_heads > 0 && pdi->bios_sectors > 0) {
#ifdef DEBUG
printf("Disk GEOM %u/%u/%u -> BIOS GEOM %u/%u/%u\n",
lp->d_ntracks, lp->d_nsectors, lp->d_ncylinders,
pdi->bios_heads, pdi->bios_sectors,
DL_GETDSIZE(lp) / (pdi->bios_heads * pdi->bios_sectors));
#endif
lp->d_ntracks = pdi->bios_heads;
lp->d_nsectors = pdi->bios_sectors;
lp->d_secpercyl = pdi->bios_sectors * pdi->bios_heads;
lp->d_ncylinders = DL_GETDSIZE(lp) / lp->d_secpercyl;
}
/* get a buffer and initialize it */
bp = geteblk((int)lp->d_secsize);
bp->b_dev = dev;
error = readdoslabel(bp, strat, lp, NULL, spoofonly);
if (error == 0)
goto done;
#if defined(CD9660)
error = iso_disklabelspoof(dev, strat, lp);
if (error == 0)
goto done;
#endif
#if defined(UDF)
error = udf_disklabelspoof(dev, strat, lp);
if (error == 0)
goto done;
#endif
done:
if (bp) {
bp->b_flags |= B_INVAL;
brelse(bp);
}
disk_change = 1;
return (error);
}
/*
* Write disk label back to device after modification.
*/
int
writedisklabel(dev_t dev, void (*strat)(struct buf *), struct disklabel *lp)
{
int error = EIO, partoff = -1;
struct disklabel *dlp;
struct buf *bp = NULL;
/* get a buffer and initialize it */
bp = geteblk((int)lp->d_secsize);
bp->b_dev = dev;
if (readdoslabel(bp, strat, lp, &partoff, 1) != 0)
goto done;
/* Read it in, slap the new label in, and write it back out */
bp->b_blkno = partoff + LABELSECTOR;
bp->b_bcount = lp->d_secsize;
CLR(bp->b_flags, B_READ | B_WRITE | B_DONE);
SET(bp->b_flags, B_BUSY | B_READ | B_RAW);
(*strat)(bp);
if ((error = biowait(bp)) != 0)
goto done;
dlp = (struct disklabel *)(bp->b_data + LABELOFFSET);
*dlp = *lp;
CLR(bp->b_flags, B_READ | B_WRITE | B_DONE);
SET(bp->b_flags, B_BUSY | B_WRITE | B_RAW);
(*strat)(bp);
error = biowait(bp);
done:
if (bp) {
bp->b_flags |= B_INVAL;
brelse(bp);
}
disk_change = 1;
return (error);
}
|
