1/*	$NetBSD: partutil.c,v 1.18 2023/01/02 16:08:13 hannken Exp $	*/
2
3/*-
4 * Copyright (c) 2006 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Christos Zoulas.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33__RCSID("$NetBSD: partutil.c,v 1.18 2023/01/02 16:08:13 hannken Exp $");
34
35#include <sys/types.h>
36#include <sys/param.h>
37#include <sys/disklabel.h>
38#include <sys/disk.h>
39#include <sys/ioctl.h>
40#include <sys/stat.h>
41
42
43#include <disktab.h>
44#include <err.h>
45#include <errno.h>
46#include <fcntl.h>
47#include <util.h>
48#include <unistd.h>
49#include <stdlib.h>
50#include <string.h>
51
52#include <prop/proplib.h>
53
54#include "partutil.h"
55
56/*
57 * Convert disklabel geometry info to disk_geom.
58 */
59static void
60label2geom(struct disk_geom *geo, const struct disklabel *lp)
61{
62	geo->dg_secperunit = lp->d_secperunit;
63	geo->dg_secsize = lp->d_secsize;
64	geo->dg_nsectors = lp->d_nsectors;
65	geo->dg_ntracks = lp->d_ntracks;
66	geo->dg_ncylinders = lp->d_ncylinders;
67	geo->dg_secpercyl = lp->d_secpercyl;
68	geo->dg_pcylinders = lp->d_ncylinders;
69	geo->dg_sparespertrack = lp->d_sparespertrack;
70	geo->dg_sparespercyl = lp->d_sparespercyl;
71	geo->dg_acylinders = lp->d_acylinders;
72}
73
74/*
75 * Set what we need to know about disk geometry.
76 */
77static void
78dict2geom(struct disk_geom *geo, prop_dictionary_t dict)
79{
80	(void)memset(geo, 0, sizeof(struct disk_geom));
81	prop_dictionary_get_int64(dict, "sectors-per-unit",
82	    &geo->dg_secperunit);
83	prop_dictionary_get_uint32(dict, "sector-size", &geo->dg_secsize);
84	prop_dictionary_get_uint32(dict, "sectors-per-track",
85	    &geo->dg_nsectors);
86	prop_dictionary_get_uint32(dict, "tracks-per-cylinder",
87	    &geo->dg_ntracks);
88	prop_dictionary_get_uint32(dict, "cylinders-per-unit",
89	    &geo->dg_ncylinders);
90}
91
92
93int
94getdiskinfo(const char *s, int fd, const char *dt, struct disk_geom *geo,
95    struct dkwedge_info *dkw)
96{
97	struct disklabel lab;
98	struct disklabel *lp = &lab;
99	prop_dictionary_t disk_dict, geom_dict;
100	struct stat sb;
101	const struct partition *pp;
102	int ptn, error;
103
104	if (dt) {
105		lp = getdiskbyname(dt);
106		if (lp == NULL)
107			errx(1, "unknown disk type `%s'", dt);
108	}
109
110	/* Get disk description dictionary */
111	disk_dict = NULL;
112	error = prop_dictionary_recv_ioctl(fd, DIOCGDISKINFO, &disk_dict);
113
114	/* fail quickly if the device does not exist at all */
115	if (error == ENXIO)
116		return -1;
117
118	if (error) {
119		/*
120		 * Ask for disklabel if DIOCGDISKINFO failed. This is
121		 * compatibility call and can be removed when all devices
122		 * will support DIOCGDISKINFO.
123		 * cgd, ccd pseudo disk drives doesn't support DIOCGDDISKINFO
124		 */
125		if (ioctl(fd, DIOCGDINFO, lp) == -1) {
126			if (errno != ENXIO)
127				warn("DIOCGDINFO on %s failed", s);
128			return -1;
129		}
130		label2geom(geo, lp);
131	} else {
132		geom_dict = prop_dictionary_get(disk_dict, "geometry");
133		dict2geom(geo, geom_dict);
134	}
135	if (disk_dict != NULL)
136		prop_object_release(disk_dict);
137
138	if (dkw == NULL)
139		return 0;
140
141	/* Get info about partition/wedge */
142	if (ioctl(fd, DIOCGWEDGEINFO, dkw) != -1) {
143		/* DIOCGWEDGEINFO didn't fail, we're done */
144		return 0;
145	}
146
147	if (ioctl(fd, DIOCGDINFO, lp) == -1) {
148		err(1, "Please implement DIOCGWEDGEINFO or "
149		    "DIOCGDINFO for disk device %s", s);
150	}
151
152	/* DIOCGDINFO didn't fail */
153	(void)memset(dkw, 0, sizeof(*dkw));
154
155	if (stat(s, &sb) == -1)
156		return 0;
157
158	ptn = DISKPART(sb.st_rdev);
159	if (ptn < 0 || ptn >= lp->d_npartitions)
160		return 0;
161
162	pp = &lp->d_partitions[ptn];
163	if (ptn != getrawpartition()) {
164		dkw->dkw_offset = pp->p_offset;
165		dkw->dkw_size = pp->p_size;
166	} else {
167		dkw->dkw_offset = 0;
168		dkw->dkw_size = geo->dg_secperunit;
169	}
170	dkw->dkw_parent[0] = '*';
171	strlcpy(dkw->dkw_ptype, getfstypename(pp->p_fstype),
172	    sizeof(dkw->dkw_ptype));
173
174	return 0;
175}
176
177int
178getdisksize(const char *name, u_int *secsize, off_t *mediasize)
179{
180	char buf[MAXPATHLEN];
181	struct disk_geom geo;
182	int fd, error;
183
184	if ((fd = opendisk(name, O_RDONLY, buf, sizeof(buf), 0)) == -1)
185		return -1;
186
187	error = getdiskinfo(name, fd, NULL, &geo, NULL);
188	close(fd);
189	if (error)
190		return error;
191
192	*secsize = geo.dg_secsize;
193	*mediasize = geo.dg_secsize * geo.dg_secperunit;
194	return 0;
195}
196