160 lines
3.7 KiB
C
160 lines
3.7 KiB
C
/*
|
|
* 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);
|
|
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);
|
|
}
|