161 lines
3.7 KiB
C
161 lines
3.7 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or https://opensource.org/licenses/CDDL-1.0.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright 2007 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*
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* Copyright (c) 2016, Intel Corporation.
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*/
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <libudev.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <fcntl.h>
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/*
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* Linux persistent device strings for vdev labels
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*
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* based on udev_device_get_devid() at zfs/lib/libzfs/libzfs_import.c
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*/
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#define DEV_BYID_PATH "/dev/disk/by-id/"
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static int
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udev_device_get_devid(struct udev_device *dev, char *bufptr, size_t buflen)
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{
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struct udev_list_entry *entry;
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const char *bus;
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char devbyid[MAXPATHLEN];
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/* The bus based by-id path is preferred */
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bus = udev_device_get_property_value(dev, "ID_BUS");
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if (bus == NULL) {
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const char *dm_uuid;
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/*
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* For multipath nodes use the persistent uuid based identifier
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*
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* Example: 'dm-uuid-mpath-35000c5006304de3f'
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*/
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dm_uuid = udev_device_get_property_value(dev, "DM_UUID");
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if (dm_uuid != NULL) {
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(void) snprintf(bufptr, buflen, "dm-uuid-%s", dm_uuid);
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return (0);
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}
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return (ENODATA);
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}
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/*
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* locate the bus specific by-id link
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*
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* Example: 'scsi-MG03SCA300_350000494a8cb3d67-part1'
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*/
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(void) snprintf(devbyid, sizeof (devbyid), "%s%s-", DEV_BYID_PATH, bus);
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entry = udev_device_get_devlinks_list_entry(dev);
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while (entry != NULL) {
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const char *name;
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name = udev_list_entry_get_name(entry);
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if (strncmp(name, devbyid, strlen(devbyid)) == 0) {
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name += strlen(DEV_BYID_PATH);
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(void) stpncpy(bufptr, name, buflen - 1);
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bufptr[buflen - 1] = '\0';
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return (0);
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}
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entry = udev_list_entry_get_next(entry);
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}
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return (ENODATA);
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}
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/*
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* Usage: devname2devid <devicepath>
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*
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* Examples:
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* # ./devname2devid /dev/sda1
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* devid scsi-350000394a8caede4-part1
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*
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* # ./devname2devid /dev/dm-1
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* devid: 'dm-uuid-mpath-35000c5006304de3f'
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*
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* This program accepts a disk or disk slice path and prints a
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* device id.
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*
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* Exit values:
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* 0 - means success
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* 1 - means failure
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*
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*/
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int
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main(int argc, char *argv[])
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{
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struct udev *udev;
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struct udev_device *dev = NULL;
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char devid[128], nodepath[MAXPATHLEN];
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char *device, *sysname;
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int ret;
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if (argc == 1) {
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(void) printf("%s <devicepath> [search path]\n", argv[0]);
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exit(1);
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}
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device = argv[1];
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if ((udev = udev_new()) == NULL) {
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perror("udev_new");
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exit(1);
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}
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/* resolve path to a runtime device node instance */
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if (realpath(device, nodepath) == NULL) {
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perror("realpath");
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exit(1);
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}
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sysname = strrchr(nodepath, '/') + 1;
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if ((dev = udev_device_new_from_subsystem_sysname(udev, "block",
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sysname)) == NULL) {
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perror(sysname);
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exit(1);
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}
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if ((ret = udev_device_get_devid(dev, devid, sizeof (devid))) != 0) {
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udev_device_unref(dev);
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errno = ret;
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perror(sysname);
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exit(1);
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}
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(void) printf("devid %s\n", devid);
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udev_device_unref(dev);
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udev_unref(udev);
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return (0);
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}
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