1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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/cdefs.h>
30__FBSDID("$FreeBSD$");
31
32#include <sys/param.h>
33#include <sys/systm.h>
34#include <sys/kernel.h>
35#include <sys/malloc.h>
36
37#include <geom/geom.h>
38#include <geom/geom_disk.h>
39#include <geom/label/g_label.h>
40#include <geom/multipath/g_multipath.h>
41
42
43#define G_LABEL_DISK_IDENT_DIR	"diskid"
44
45static char* classes_pass[] = { G_DISK_CLASS_NAME, G_MULTIPATH_CLASS_NAME,
46    NULL };
47
48static void
49g_label_disk_ident_taste(struct g_consumer *cp, char *label, size_t size)
50{
51	struct g_class *cls;
52	char ident[DISK_IDENT_SIZE];
53	int ident_len, found, i;
54
55	g_topology_assert_not();
56	label[0] = '\0';
57
58	cls = cp->provider->geom->class;
59
60	/*
61	 * Get the GEOM::ident string, and construct a label in the format
62	 * "CLASS_NAME-ident"
63	 */
64	ident_len = sizeof(ident);
65	if (g_io_getattr("GEOM::ident", cp, &ident_len, ident) == 0) {
66		if (ident_len == 0 || ident[0] == '\0')
67			return;
68		for (i = 0, found = 0; classes_pass[i] != NULL; i++)
69			if (strcmp(classes_pass[i], cls->name) == 0) {
70				found = 1;
71				break;
72			}
73		if (!found)
74			return;
75		/*
76		 * We can safely ignore the result of snprintf(): the label
77		 * will simply be truncated, which at most is only annoying.
78		 */
79		(void)snprintf(label, size, "%s-%s", cls->name, ident);
80	}
81}
82
83struct g_label_desc g_label_disk_ident = {
84	.ld_taste = g_label_disk_ident_taste,
85	.ld_dir = G_LABEL_DISK_IDENT_DIR,
86	.ld_enabled = 1
87};
88
89G_LABEL_INIT(disk_ident, g_label_disk_ident, "Create device nodes for drives "
90    "which export a disk identification string");
91