1 /*        $NetBSD: partutil.c,v 1.19 2025/04/13 14:00:59 jakllsch 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 1.19 2025/04/13 14:00:59 jakllsch 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  */
59 static void
label2geom(struct disk_geom * geo,const struct disklabel * lp)60 label2geom(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  */
77 static void
dict2geom(struct disk_geom * geo,prop_dictionary_t dict)78 dict2geom(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           geo->dg_physsecsize = geo->dg_secsize;
91           prop_dictionary_get_uint32(dict, "physical-sector-size",
92               &geo->dg_physsecsize);
93           prop_dictionary_get_uint32(dict, "aligned-sector",
94               &geo->dg_alignedsec);
95 }
96 
97 
98 int
getdiskinfo(const char * s,int fd,const char * dt,struct disk_geom * geo,struct dkwedge_info * dkw)99 getdiskinfo(const char *s, int fd, const char *dt, struct disk_geom *geo,
100     struct dkwedge_info *dkw)
101 {
102           struct disklabel lab;
103           struct disklabel *lp = &lab;
104           prop_dictionary_t disk_dict, geom_dict;
105           struct stat sb;
106           const struct partition *pp;
107           int ptn, error;
108 
109           if (dt) {
110                     lp = getdiskbyname(dt);
111                     if (lp == NULL)
112                               errx(1, "unknown disk type `%s'", dt);
113           }
114 
115           /* Get disk description dictionary */
116           disk_dict = NULL;
117           error = prop_dictionary_recv_ioctl(fd, DIOCGDISKINFO, &disk_dict);
118 
119           /* fail quickly if the device does not exist at all */
120           if (error == ENXIO)
121                     return -1;
122 
123           if (error) {
124                     /*
125                      * Ask for disklabel if DIOCGDISKINFO failed. This is
126                      * compatibility call and can be removed when all devices
127                      * will support DIOCGDISKINFO.
128                      * cgd, ccd pseudo disk drives doesn't support DIOCGDDISKINFO
129                      */
130                     if (ioctl(fd, DIOCGDINFO, lp) == -1) {
131                               if (errno != ENXIO)
132                                         warn("DIOCGDINFO on %s failed", s);
133                               return -1;
134                     }
135                     label2geom(geo, lp);
136           } else {
137                     geom_dict = prop_dictionary_get(disk_dict, "geometry");
138                     dict2geom(geo, geom_dict);
139           }
140           if (disk_dict != NULL)
141                     prop_object_release(disk_dict);
142 
143           if (dkw == NULL)
144                     return 0;
145 
146           /* Get info about partition/wedge */
147           if (ioctl(fd, DIOCGWEDGEINFO, dkw) != -1) {
148                     /* DIOCGWEDGEINFO didn't fail, we're done */
149                     return 0;
150           }
151 
152           if (ioctl(fd, DIOCGDINFO, lp) == -1) {
153                     err(1, "Please implement DIOCGWEDGEINFO or "
154                         "DIOCGDINFO for disk device %s", s);
155           }
156 
157           /* DIOCGDINFO didn't fail */
158           (void)memset(dkw, 0, sizeof(*dkw));
159 
160           if (stat(s, &sb) == -1)
161                     return 0;
162 
163           ptn = DISKPART(sb.st_rdev);
164           if (ptn < 0 || ptn >= lp->d_npartitions)
165                     return 0;
166 
167           pp = &lp->d_partitions[ptn];
168           if (ptn != getrawpartition()) {
169                     dkw->dkw_offset = pp->p_offset;
170                     dkw->dkw_size = pp->p_size;
171           } else {
172                     dkw->dkw_offset = 0;
173                     dkw->dkw_size = geo->dg_secperunit;
174           }
175           dkw->dkw_parent[0] = '*';
176           strlcpy(dkw->dkw_ptype, getfstypename(pp->p_fstype),
177               sizeof(dkw->dkw_ptype));
178 
179           return 0;
180 }
181 
182 int
getdisksize(const char * name,u_int * secsize,off_t * mediasize)183 getdisksize(const char *name, u_int *secsize, off_t *mediasize)
184 {
185           char buf[MAXPATHLEN];
186           struct disk_geom geo;
187           int fd, error;
188 
189           if ((fd = opendisk(name, O_RDONLY, buf, sizeof(buf), 0)) == -1)
190                     return -1;
191 
192           error = getdiskinfo(name, fd, NULL, &geo, NULL);
193           close(fd);
194           if (error)
195                     return error;
196 
197           *secsize = geo.dg_secsize;
198           *mediasize = geo.dg_secsize * geo.dg_secperunit;
199           return 0;
200 }
201