xref: /freebsd/sys/geom/label/g_label_flashmap.c (revision 1631382cf2820245cc72965498ff174bb548dd63)
1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
3  *
4  * Copyright (c) 2019 Ian Lepore <ian@FreeBSD.org>
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
9  * 1. Redistributions of source code must retain the above copyright
10  *    notice, this list of conditions and the following disclaimer.
11  * 2. Redistributions in binary form must reproduce the above copyright
12  *    notice, this list of conditions and the following disclaimer in the
13  *    documentation and/or other materials provided with the distribution.
14  *
15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25  * SUCH DAMAGE.
26  */
27 
28 #include <sys/param.h>
29 #include <sys/systm.h>
30 #include <sys/kernel.h>
31 #include <sys/malloc.h>
32 #include <sys/slicer.h>
33 
34 #include <geom/geom.h>
35 #include <geom/geom_flashmap.h>
36 #include <geom/geom_slice.h>
37 #include <geom/label/g_label.h>
38 
39 static void
40 g_label_flashmap_taste(struct g_consumer *cp, char *label, size_t size)
41 {
42 	struct g_flashmap *gfp;
43 	struct g_slicer *gsp;
44 	struct g_provider *pp;
45 
46 	g_topology_assert_not();
47 
48 	pp = cp->provider;
49 	label[0] = '\0';
50 
51 	/* We taste only partitions handled by flashmap */
52 	if (strncmp(pp->geom->class->name, FLASHMAP_CLASS_NAME,
53 	    sizeof(FLASHMAP_CLASS_NAME)) != 0)
54 		return;
55 
56 	gsp = (struct g_slicer *)pp->geom->softc;
57 	gfp = (struct g_flashmap *)gsp->softc;
58 
59 	/* If it's handled by flashmap it should have a label, but be safe. */
60 	if (gfp->labels[pp->index] == NULL)
61 		return;
62 
63 	strlcpy(label, gfp->labels[pp->index], size);
64 }
65 
66 struct g_label_desc g_label_flashmap = {
67 	.ld_taste = g_label_flashmap_taste,
68 	.ld_dirprefix = "flash/",
69 	.ld_enabled = 1
70 };
71 
72 G_LABEL_INIT(flashmap, g_label_flashmap, "Create device nodes for Flashmap labels");
73