1/*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2012 Ivan Voras <ivoras@FreeBSD.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#include <sys/param.h>
30#include <sys/systm.h>
31#include <sys/kernel.h>
32#include <sys/malloc.h>
33
34#include <geom/geom.h>
35#include <geom/geom_disk.h>
36#include <geom/label/g_label.h>
37#include <geom/multipath/g_multipath.h>
38
39static char* classes_pass[] = { G_DISK_CLASS_NAME, G_MULTIPATH_CLASS_NAME,
40    NULL };
41
42static void
43g_label_disk_ident_taste(struct g_consumer *cp, char *label, size_t size)
44{
45	struct g_class *cls;
46	char ident[DISK_IDENT_SIZE];
47	int ident_len, found, i;
48
49	g_topology_assert_not();
50	label[0] = '\0';
51
52	cls = cp->provider->geom->class;
53
54	/*
55	 * Get the GEOM::ident string, and construct a label in the format
56	 * "CLASS_NAME-ident"
57	 */
58	ident_len = sizeof(ident);
59	if (g_io_getattr("GEOM::ident", cp, &ident_len, ident) == 0) {
60		if (ident_len == 0 || ident[0] == '\0')
61			return;
62		for (i = 0, found = 0; classes_pass[i] != NULL; i++)
63			if (strcmp(classes_pass[i], cls->name) == 0) {
64				found = 1;
65				break;
66			}
67		if (!found)
68			return;
69		/*
70		 * We can safely ignore the result of snprintf(): the label
71		 * will simply be truncated, which at most is only annoying.
72		 */
73		(void)snprintf(label, size, "%s-%s", cls->name, ident);
74	}
75}
76
77struct g_label_desc g_label_disk_ident = {
78	.ld_taste = g_label_disk_ident_taste,
79	.ld_dirprefix = "diskid/",
80	.ld_enabled = 1
81};
82
83G_LABEL_INIT(disk_ident, g_label_disk_ident, "Create device nodes for drives "
84    "which export a disk identification string");
85