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
|
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2007 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*
* Copyright (c) 2016, Intel Corporation.
*/
#include <sys/types.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <libudev.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
/*
* Linux persistent device strings for vdev labels
*
* based on udev_device_get_devid() at zfs/lib/libzfs/libzfs_import.c
*/
#define DEV_BYID_PATH "/dev/disk/by-id/"
static int
udev_device_get_devid(struct udev_device *dev, char *bufptr, size_t buflen)
{
struct udev_list_entry *entry;
const char *bus;
char devbyid[MAXPATHLEN];
/* The bus based by-id path is preferred */
bus = udev_device_get_property_value(dev, "ID_BUS");
if (bus == NULL) {
const char *dm_uuid;
/*
* For multipath nodes use the persistent uuid based identifier
*
* Example: 'dm-uuid-mpath-35000c5006304de3f'
*/
dm_uuid = udev_device_get_property_value(dev, "DM_UUID");
if (dm_uuid != NULL) {
(void) snprintf(bufptr, buflen, "dm-uuid-%s", dm_uuid);
return (0);
}
return (ENODATA);
}
/*
* locate the bus specific by-id link
*
* Example: 'scsi-MG03SCA300_350000494a8cb3d67-part1'
*/
(void) snprintf(devbyid, sizeof (devbyid), "%s%s-", DEV_BYID_PATH, bus);
entry = udev_device_get_devlinks_list_entry(dev);
while (entry != NULL) {
const char *name;
name = udev_list_entry_get_name(entry);
if (strncmp(name, devbyid, strlen(devbyid)) == 0) {
name += strlen(DEV_BYID_PATH);
(void) stpncpy(bufptr, name, buflen - 1);
bufptr[buflen - 1] = '\0';
return (0);
}
entry = udev_list_entry_get_next(entry);
}
return (ENODATA);
}
/*
* Usage: devname2devid <devicepath>
*
* Examples:
* # ./devname2devid /dev/sda1
* devid scsi-350000394a8caede4-part1
*
* # ./devname2devid /dev/dm-1
* devid: 'dm-uuid-mpath-35000c5006304de3f'
*
* This program accepts a disk or disk slice path and prints a
* device id.
*
* Exit values:
* 0 - means success
* 1 - means failure
*
*/
int
main(int argc, char *argv[])
{
struct udev *udev;
struct udev_device *dev = NULL;
char devid[128], nodepath[MAXPATHLEN];
char *device, *sysname;
int ret;
if (argc == 1) {
(void) printf("%s <devicepath> [search path]\n", argv[0]);
exit(1);
}
device = argv[1];
if ((udev = udev_new()) == NULL) {
perror("udev_new");
exit(1);
}
/* resolve path to a runtime device node instance */
if (realpath(device, nodepath) == NULL) {
perror("realpath");
exit(1);
}
sysname = strrchr(nodepath, '/') + 1;
if ((dev = udev_device_new_from_subsystem_sysname(udev, "block",
sysname)) == NULL) {
perror(sysname);
exit(1);
}
if ((ret = udev_device_get_devid(dev, devid, sizeof (devid))) != 0) {
udev_device_unref(dev);
errno = ret;
perror(sysname);
exit(1);
}
(void) printf("devid %s\n", devid);
udev_device_unref(dev);
udev_unref(udev);
return (0);
}
|
