partutil.c revision 1.17
1 /* $NetBSD: partutil.c,v 1.17 2019/09/28 18:03:18 bad 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 1.17 2019/09/28 18:03:18 bad 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 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 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 } 91 92 93 int 94 getdiskinfo(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 = strchr(s, '\0')[-1] - 'a'; 159 if ((unsigned)ptn >= lp->d_npartitions || 160 (devminor_t)ptn != DISKPART(sb.st_rdev)) 161 return 0; 162 163 pp = &lp->d_partitions[ptn]; 164 if (ptn != getrawpartition()) { 165 dkw->dkw_offset = pp->p_offset; 166 dkw->dkw_size = pp->p_size; 167 } else { 168 dkw->dkw_offset = 0; 169 dkw->dkw_size = geo->dg_secperunit; 170 } 171 dkw->dkw_parent[0] = '*'; 172 strlcpy(dkw->dkw_ptype, getfstypename(pp->p_fstype), 173 sizeof(dkw->dkw_ptype)); 174 175 return 0; 176 } 177 178 int 179 getdisksize(const char *name, u_int *secsize, off_t *mediasize) 180 { 181 char buf[MAXPATHLEN]; 182 struct disk_geom geo; 183 int fd, error; 184 185 if ((fd = opendisk(name, O_RDONLY, buf, sizeof(buf), 0)) == -1) 186 return -1; 187 188 error = getdiskinfo(name, fd, NULL, &geo, NULL); 189 close(fd); 190 if (error) 191 return error; 192 193 *secsize = geo.dg_secsize; 194 *mediasize = geo.dg_secsize * geo.dg_secperunit; 195 return 0; 196 } 197
Indexes created Wed Sep 24 05:09:52 GMT 2025