sbin/fsck/partutil.c

   1 /*      $NetBSD: partutil.c,v 1.12 2013/04/13 22:08:57 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 1.12 2013/04/13 22:08:57 jakllsch Exp $");
  34
  35 #include <sys/types.h>
  36 #include <sys/disklabel.h>
  37 #include <sys/disk.h>
  38 #include <sys/ioctl.h>
  39 #include <sys/stat.h>
  40
  41
  42 #include <disktab.h>
  43 #include <err.h>
  44 #include <errno.h>
  45 #include <fcntl.h>
  46 #include <util.h>
  47 #include <unistd.h>
  48 #include <stdlib.h>
  49 #include <string.h>
  50
  51 #include <prop/proplib.h>
  52
  53 #include "partutil.h"
  54
  55 /*
  56  * Convert disklabel geometry info to disk_geom.
  57  */
  58 static void
  59 label2geom(struct disk_geom *geo, const struct disklabel *lp)
  60 {
  61         geo->dg_secperunit = lp->d_secperunit;
  62         geo->dg_secsize = lp->d_secsize;
  63         geo->dg_nsectors = lp->d_nsectors;
  64         geo->dg_ntracks = lp->d_ntracks;
  65         geo->dg_ncylinders = lp->d_ncylinders;
  66         geo->dg_secpercyl = lp->d_secpercyl;
  67         geo->dg_pcylinders = lp->d_ncylinders;
  68         geo->dg_sparespertrack = lp->d_sparespertrack;
  69         geo->dg_sparespercyl = lp->d_sparespercyl;
  70         geo->dg_acylinders = lp->d_acylinders;
  71 }
  72
  73 /*
  74  * Set what we need to know about disk geometry.
  75  */
  76 static void
  77 dict2geom(struct disk_geom *geo, prop_dictionary_t dict)
  78 {
  79         (void)memset(geo, 0, sizeof(struct disk_geom));
  80         prop_dictionary_get_int64(dict, "sectors-per-unit",
  81             &geo->dg_secperunit);
  82         prop_dictionary_get_uint32(dict, "sector-size", &geo->dg_secsize);
  83         prop_dictionary_get_uint32(dict, "sectors-per-track",
  84             &geo->dg_nsectors);
  85         prop_dictionary_get_uint32(dict, "tracks-per-cylinder",
  86             &geo->dg_ntracks);
  87         prop_dictionary_get_uint32(dict, "cylinders-per-unit",
  88             &geo->dg_ncylinders);
  89 }
  90
  91
  92 int
  93 getdiskinfo(const char *s, int fd, const char *dt, struct disk_geom *geo,
  94     struct dkwedge_info *dkw)
  95 {
  96         struct disklabel lab;
  97         struct disklabel *lp = &lab;
  98         prop_dictionary_t disk_dict, geom_dict;
  99 #if !defined(__minix)
 100         struct stat sb;
 101         const struct partition *pp;
 102         int ptn;
 103 #endif /* defined(__minix) */
 104
 105         if (dt) {
 106 #if defined(__minix)
 107                 errx(1, "minix doesn't know about disk types (%s)", dt);
 108 #else
 109                 lp = getdiskbyname(dt);
 110                 if (lp == NULL)
 111                         errx(1, "unknown disk type `%s'", dt);
 112 #endif /* defined(__minix) */
 113         }
 114
 115         /* Get disk description dictionary */
 116 #if !defined(__minix)
 117         if (prop_dictionary_recv_ioctl(fd, DIOCGDISKINFO, &disk_dict)) {
 118 #else
 119         if (1) {
 120 #endif /* !defined(__minix) */
 121                 /*
 122                  * Ask for disklabel if DIOCGDISKINFO failed. This is
 123                  * compatibility call and can be removed when all devices
 124                  * will support DIOCGDISKINFO.
 125                  * cgd, ccd pseudo disk drives doesn't support DIOCGDDISKINFO
 126                  */
 127                 if (ioctl(fd, DIOCGDINFO, lp) == -1) {
 128                         warn("DIOCGDINFO on %s failed", s);
 129                         return -1;
 130                 }
 131                 label2geom(geo, lp);
 132         } else {
 133                 geom_dict = prop_dictionary_get(disk_dict, "geometry");
 134                 dict2geom(geo, geom_dict);
 135         }
 136
 137         /* Get info about partition/wedge */
 138         if (ioctl(fd, DIOCGWEDGEINFO, dkw) != -1) {
 139                 /* DIOCGWEDGEINFO didn't fail, we're done */
 140                 return 0;
 141         }
 142
 143         if (ioctl(fd, DIOCGDINFO, lp) == -1) {
 144                 err(1, "Please implement DIOCGWEDGEINFO or "
 145                     "DIOCGDINFO for disk device %s", s);
 146         }
 147
 148 #if !defined(__minix)
 149         /* DIOCGDINFO didn't fail */
 150
 151         (void)memset(dkw, 0, sizeof(*dkw));
 152
 153         if (stat(s, &sb) == -1)
 154                 return 0;
 155
 156         ptn = strchr(s, '\0')[-1] - 'a';
 157         if ((unsigned)ptn >= lp->d_npartitions ||
 158             (devminor_t)ptn != DISKPART(sb.st_rdev))
 159                 return 0;
 160
 161         pp = &lp->d_partitions[ptn];
 162         if (ptn != getrawpartition()) {
 163                 dkw->dkw_offset = pp->p_offset;
 164                 dkw->dkw_size = pp->p_size;
 165         } else {
 166                 dkw->dkw_offset = 0;
 167                 dkw->dkw_size = geo->dg_secperunit;
 168         }
 169         dkw->dkw_parent[0] = '*';
 170         strlcpy(dkw->dkw_ptype, getfstypename(pp->p_fstype),
 171             sizeof(dkw->dkw_ptype));
 172 #endif /* !defined(__minix) */
 173
 174         return 0;
 175 }