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
|
/*
* base_device.c
*
* Return the "base device" given a particular device; this is used to
* assure that we only fsck one partition on a particular drive at any
* one time. Otherwise, the disk heads will be seeking all over the
* place. If the base device can not be determined, return NULL.
*
* The base_device() function returns an allocated string which must
* be freed.
*
* Written by Theodore Ts'o, <tytso@mit.edu>
*
* Copyright (C) 2000 Theodore Ts'o.
*
* %Begin-Header%
* This file may be redistributed under the terms of the GNU Public
* License.
* %End-Header%
*/
#include <stdio.h>
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#if HAVE_STDLIB_H
#include <stdlib.h>
#endif
#include <ctype.h>
#include <string.h>
#include "fsck.h"
/*
* Required for the uber-silly devfs /dev/ide/host1/bus2/target3/lun3
* pathames.
*/
static const char *devfs_hier[] = {
"host", "bus", "target", "lun", 0
};
char *base_device(const char *device)
{
char *str, *cp;
const char **hier, *disk;
int len;
str = malloc(strlen(device)+1);
if (!str)
return NULL;
strcpy(str, device);
cp = str;
/* Skip over /dev/; if it's not present, give up. */
if (strncmp(cp, "/dev/", 5) != 0)
goto errout;
cp += 5;
/* Skip over /dev/dsk/... */
if (strncmp(cp, "dsk/", 4) == 0)
cp += 4;
/*
* For md devices, we treat them all as if they were all
* on one disk, since we don't know how to parallelize them.
*/
if (cp[0] == 'm' && cp[1] == 'd') {
*(cp+2) = 0;
return str;
}
/* Handle DAC 960 devices */
if (strncmp(cp, "rd/", 3) == 0) {
cp += 3;
if (cp[0] != 'c' || cp[2] != 'd' ||
!isdigit(cp[1]) || !isdigit(cp[3]))
goto errout;
*(cp+4) = 0;
return str;
}
/* Now let's handle /dev/hd* and /dev/sd* devices.... */
if ((cp[0] == 'h' || cp[0] == 's') && (cp[1] == 'd')) {
cp += 2;
/* If there's a single number after /dev/hd, skip it */
if (isdigit(*cp))
cp++;
/* What follows must be an alpha char, or give up */
if (!isalpha(*cp))
goto errout;
*(cp + 1) = 0;
return str;
}
/* Now let's handle devfs (ugh) names */
len = 0;
if (strncmp(cp, "ide/", 4) == 0)
len = 4;
if (strncmp(cp, "scsi/", 5) == 0)
len = 5;
if (len) {
cp += len;
/*
* Now we proceed down the expected devfs hierarchy.
* i.e., .../host1/bus2/target3/lun4/...
* If we don't find the expected token, followed by
* some number of digits at each level, abort.
*/
for (hier = devfs_hier; *hier; hier++) {
len = strlen(*hier);
if (strncmp(cp, *hier, len) != 0)
goto errout;
cp += len;
while (*cp != '/' && *cp != 0) {
if (!isdigit(*cp))
goto errout;
cp++;
}
cp++;
}
*(cp - 1) = 0;
return str;
}
/* Now handle devfs /dev/disc or /dev/disk names */
disk = 0;
if (strncmp(cp, "discs/", 6) == 0)
disk = "disc";
else if (strncmp(cp, "disks/", 6) == 0)
disk = "disk";
if (disk) {
cp += 6;
if (strncmp(cp, disk, 4) != 0)
goto errout;
cp += 4;
while (*cp != '/' && *cp != 0) {
if (!isdigit(*cp))
goto errout;
cp++;
}
*cp = 0;
return str;
}
errout:
free(str);
return NULL;
}
#ifdef DEBUG
int main(int argc, char** argv)
{
const char *base;
char buf[256], *cp;
while (1) {
if (fgets(buf, sizeof(buf), stdin) == NULL)
break;
cp = strchr(buf, '\n');
if (cp)
*cp = 0;
cp = strchr(buf, '\t');
if (cp)
*cp = 0;
base = base_device(buf);
printf("%s\t%s\n", buf, base ? base : "NONE");
}
exit(0);
}
#endif
|
