1/*-
2 * Copyright (c) 2012 Ivan Voras <ivoras@FreeBSD.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD$");
29
30#include <sys/param.h>
31#include <sys/systm.h>
32#include <sys/kernel.h>
33#include <sys/malloc.h>
34
35#include <geom/geom.h>
36#include <geom/geom_disk.h>
37#include <geom/label/g_label.h>
38#include <geom/multipath/g_multipath.h>
39
40
41#define G_LABEL_DISK_IDENT_DIR	"diskid"
42
43static char* classes_pass[] = { G_DISK_CLASS_NAME, G_MULTIPATH_CLASS_NAME,
44    NULL };
45
46static void
47g_label_disk_ident_taste(struct g_consumer *cp, char *label, size_t size)
48{
49	struct g_class *cls;
50	char ident[100];
51	int ident_len, found, i;
52
53	g_topology_assert_not();
54	label[0] = '\0';
55
56	cls = cp->provider->geom->class;
57
58	/*
59	 * Get the GEOM::ident string, and construct a label in the format
60	 * "CLASS_NAME-ident"
61	 */
62	ident_len = sizeof(ident);
63	if (g_io_getattr("GEOM::ident", cp, &ident_len, ident) == 0) {
64		if (ident_len == 0 || ident[0] == '\0')
65			return;
66		for (i = 0, found = 0; classes_pass[i] != NULL; i++)
67			if (strcmp(classes_pass[i], cls->name) == 0) {
68				found = 1;
69				break;
70			}
71		if (!found)
72			return;
73		/*
74		 * We can safely ignore the result of snprintf(): the label
75		 * will simply be truncated, which at most is only annoying.
76		 */
77		(void)snprintf(label, size, "%s-%s", cls->name, ident);
78	}
79}
80
81struct g_label_desc g_label_disk_ident = {
82	.ld_taste = g_label_disk_ident_taste,
83	.ld_dir = G_LABEL_DISK_IDENT_DIR,
84	.ld_enabled = 1
85};
86
87G_LABEL_INIT(disk_ident, g_label_disk_ident, "Create device nodes for drives "
88    "which export a disk identification string");
89