sbin/gpt/remove.c

   1 /*-
   2  * Copyright (c) 2004 Marcel Moolenaar
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   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 ``AS IS'' AND ANY EXPRESS OR
  16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  *
  26  * $FreeBSD: src/sbin/gpt/remove.c,v 1.10 2006/10/04 18:20:25 marcel Exp $
  27  * $DragonFly: src/sbin/gpt/remove.c,v 1.2 2007/06/17 08:34:59 dillon Exp $
  28  */
  29
  30 #include <sys/types.h>
  31
  32 #include <err.h>
  33 #include <stddef.h>
  34 #include <stdio.h>
  35 #include <stdlib.h>
  36 #include <string.h>
  37 #include <unistd.h>
  38
  39 #include "map.h"
  40 #include "gpt.h"
  41
  42 static int all;
  43 static uuid_t type;
  44 static off_t block, size;
  45 static unsigned int entry = NOENTRY;
  46
  47 static void
  48 usage_remove(void)
  49 {
  50
  51         fprintf(stderr,
  52             "usage: %s -a device ...\n"
  53             "       %s [-b lba] [-i index] [-s lba] [-t uuid] device ...\n",
  54             getprogname(), getprogname());
  55         exit(1);
  56 }
  57
  58 static void
  59 rem(int fd)
  60 {
  61         uuid_t uuid;
  62         map_t *gpt, *tpg;
  63         map_t *tbl, *lbt;
  64         map_t *m;
  65         struct gpt_hdr *hdr;
  66         struct gpt_ent *ent;
  67         unsigned int i;
  68
  69         gpt = map_find(MAP_TYPE_PRI_GPT_HDR);
  70         if (gpt == NULL) {
  71                 warnx("%s: error: no primary GPT header; run create or recover",
  72                     device_name);
  73                 return;
  74         }
  75
  76         tpg = map_find(MAP_TYPE_SEC_GPT_HDR);
  77         if (tpg == NULL) {
  78                 warnx("%s: error: no secondary GPT header; run recover",
  79                     device_name);
  80                 return;
  81         }
  82
  83         tbl = map_find(MAP_TYPE_PRI_GPT_TBL);
  84         lbt = map_find(MAP_TYPE_SEC_GPT_TBL);
  85         if (tbl == NULL || lbt == NULL) {
  86                 warnx("%s: error: run recover -- trust me", device_name);
  87                 return;
  88         }
  89
  90         /* Remove all matching entries in the map. */
  91         for (m = map_first(); m != NULL; m = m->map_next) {
  92                 if (m->map_type != MAP_TYPE_GPT_PART || m->map_index == NOENTRY)
  93                         continue;
  94                 if (entry != NOENTRY && entry != m->map_index)
  95                         continue;
  96                 if (block > 0 && block != m->map_start)
  97                         continue;
  98                 if (size > 0 && size != m->map_size)
  99                         continue;
 100
 101                 i = m->map_index;
 102
 103                 hdr = gpt->map_data;
 104                 ent = (void*)((char*)tbl->map_data + i *
 105                     le32toh(hdr->hdr_entsz));
 106                 le_uuid_dec(&ent->ent_type, &uuid);
 107                 if (!uuid_is_nil(&type, NULL) &&
 108                     !uuid_equal(&type, &uuid, NULL))
 109                         continue;
 110
 111                 /* Remove the primary entry by clearing the partition type. */
 112                 uuid_create_nil(&ent->ent_type, NULL);
 113
 114                 hdr->hdr_crc_table = htole32(crc32(tbl->map_data,
 115                     le32toh(hdr->hdr_entries) * le32toh(hdr->hdr_entsz)));
 116                 hdr->hdr_crc_self = 0;
 117                 hdr->hdr_crc_self = htole32(crc32(hdr, le32toh(hdr->hdr_size)));
 118
 119                 gpt_write(fd, gpt);
 120                 gpt_write(fd, tbl);
 121
 122                 hdr = tpg->map_data;
 123                 ent = (void*)((char*)lbt->map_data + i *
 124                     le32toh(hdr->hdr_entsz));
 125
 126                 /* Remove the secundary entry. */
 127                 uuid_create_nil(&ent->ent_type, NULL);
 128
 129                 hdr->hdr_crc_table = htole32(crc32(lbt->map_data,
 130                     le32toh(hdr->hdr_entries) * le32toh(hdr->hdr_entsz)));
 131                 hdr->hdr_crc_self = 0;
 132                 hdr->hdr_crc_self = htole32(crc32(hdr, le32toh(hdr->hdr_size)));
 133
 134                 gpt_write(fd, lbt);
 135                 gpt_write(fd, tpg);
 136
 137                 printf("%ss%u removed\n", device_name, m->map_index);
 138         }
 139 }
 140
 141 int
 142 cmd_remove(int argc, char *argv[])
 143 {
 144         char *p;
 145         int ch, fd;
 146
 147         /* Get the remove options */
 148         while ((ch = getopt(argc, argv, "ab:i:s:t:")) != -1) {
 149                 switch(ch) {
 150                 case 'a':
 151                         if (all > 0)
 152                                 usage_remove();
 153                         all = 1;
 154                         break;
 155                 case 'b':
 156                         if (block > 0)
 157                                 usage_remove();
 158                         block = strtoll(optarg, &p, 10);
 159                         if (*p != 0 || block < 1)
 160                                 usage_remove();
 161                         break;
 162                 case 'i':
 163                         if (entry != NOENTRY)
 164                                 usage_remove();
 165                         entry = strtoul(optarg, &p, 10);
 166                         if (*p != 0 || entry == NOENTRY)
 167                                 usage_remove();
 168                         break;
 169                 case 's':
 170                         if (size > 0)
 171                                 usage_remove();
 172                         size = strtoll(optarg, &p, 10);
 173                         if (*p != 0 || size < 1)
 174                                 usage_remove();
 175                         break;
 176                 case 't':
 177                         if (!uuid_is_nil(&type, NULL))
 178                                 usage_remove();
 179                         if (parse_uuid(optarg, &type) != 0)
 180                                 usage_remove();
 181                         break;
 182                 default:
 183                         usage_remove();
 184                 }
 185         }
 186
 187         if (!all ^
 188             (block > 0 || entry != NOENTRY || size > 0 ||
 189              !uuid_is_nil(&type, NULL)))
 190                 usage_remove();
 191
 192         if (argc == optind)
 193                 usage_remove();
 194
 195         while (optind < argc) {
 196                 fd = gpt_open(argv[optind++]);
 197                 if (fd == -1) {
 198                         warn("unable to open device '%s'", device_name);
 199                         continue;
 200                 }
 201
 202                 rem(fd);
 203
 204                 gpt_close(fd);
 205         }
 206
 207         return (0);
 208 }