1 /*- 2 * Copyright (c) 2002 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 27 #include <sys/cdefs.h> 28 #ifdef __FBSDID 29 __FBSDID("$FreeBSD: src/sbin/gpt/create.c,v 1.11 2005/08/31 01:47:19 marcel Exp $"); 30 #endif 31 #ifdef __RCSID 32 __RCSID("$NetBSD: create.c,v 1.3 2007/12/18 21:46:46 riz Exp $"); 33 #endif 34 35 #include <sys/types.h> 36 37 #include <err.h> 38 #include <stddef.h> 39 #include <stdio.h> 40 #include <stdlib.h> 41 #include <string.h> 42 #include <unistd.h> 43 44 #include "map.h" 45 #include "gpt.h" 46 47 static int force; 48 static int primary_only; 49 50 const char createmsg[] = "create [-fp] device ..."; 51 52 static void 53 usage_create(void) 54 { 55 56 fprintf(stderr, 57 "usage: %s %s\n", getprogname(), createmsg); 58 exit(1); 59 } 60 61 static void 62 create(int fd) 63 { 64 uuid_t uuid; 65 off_t blocks, last; 66 map_t *gpt, *tpg; 67 map_t *tbl, *lbt; 68 map_t *map; 69 struct mbr *mbr; 70 struct gpt_hdr *hdr; 71 struct gpt_ent *ent; 72 unsigned int i; 73 74 last = mediasz / secsz - 1LL; 75 76 if (map_find(MAP_TYPE_PRI_GPT_HDR) != NULL || 77 map_find(MAP_TYPE_SEC_GPT_HDR) != NULL) { 78 warnx("%s: error: device already contains a GPT", device_name); 79 return; 80 } 81 map = map_find(MAP_TYPE_MBR); 82 if (map != NULL) { 83 if (!force) { 84 warnx("%s: error: device contains a MBR", device_name); 85 return; 86 } 87 88 /* Nuke the MBR in our internal map. */ 89 map->map_type = MAP_TYPE_UNUSED; 90 } 91 92 /* 93 * Create PMBR. 94 */ 95 if (map_find(MAP_TYPE_PMBR) == NULL) { 96 if (map_free(0LL, 1LL) == 0) { 97 warnx("%s: error: no room for the PMBR", device_name); 98 return; 99 } 100 mbr = gpt_read(fd, 0LL, 1); 101 bzero(mbr, sizeof(*mbr)); 102 mbr->mbr_sig = htole16(MBR_SIG); 103 mbr->mbr_part[0].part_shd = 0xff; 104 mbr->mbr_part[0].part_ssect = 0xff; 105 mbr->mbr_part[0].part_scyl = 0xff; 106 mbr->mbr_part[0].part_typ = 0xee; 107 mbr->mbr_part[0].part_ehd = 0xff; 108 mbr->mbr_part[0].part_esect = 0xff; 109 mbr->mbr_part[0].part_ecyl = 0xff; 110 mbr->mbr_part[0].part_start_lo = htole16(1); 111 if (last > 0xffffffff) { 112 mbr->mbr_part[0].part_size_lo = htole16(0xffff); 113 mbr->mbr_part[0].part_size_hi = htole16(0xffff); 114 } else { 115 mbr->mbr_part[0].part_size_lo = htole16(last); 116 mbr->mbr_part[0].part_size_hi = htole16(last >> 16); 117 } 118 map = map_add(0LL, 1LL, MAP_TYPE_PMBR, mbr); 119 gpt_write(fd, map); 120 } 121 122 /* Get the amount of free space after the MBR */ 123 blocks = map_free(1LL, 0LL); 124 if (blocks == 0LL) { 125 warnx("%s: error: no room for the GPT header", device_name); 126 return; 127 } 128 129 /* Don't create more than parts entries. */ 130 if ((uint64_t)(blocks - 1) * secsz > parts * sizeof(struct gpt_ent)) { 131 blocks = (parts * sizeof(struct gpt_ent)) / secsz; 132 if ((parts * sizeof(struct gpt_ent)) % secsz) 133 blocks++; 134 blocks++; /* Don't forget the header itself */ 135 } 136 137 /* Never cross the median of the device. */ 138 if ((blocks + 1LL) > ((last + 1LL) >> 1)) 139 blocks = ((last + 1LL) >> 1) - 1LL; 140 141 /* 142 * Get the amount of free space at the end of the device and 143 * calculate the size for the GPT structures. 144 */ 145 map = map_last(); 146 if (map->map_type != MAP_TYPE_UNUSED) { 147 warnx("%s: error: no room for the backup header", device_name); 148 return; 149 } 150 151 if (map->map_size < blocks) 152 blocks = map->map_size; 153 if (blocks == 1LL) { 154 warnx("%s: error: no room for the GPT table", device_name); 155 return; 156 } 157 158 blocks--; /* Number of blocks in the GPT table. */ 159 gpt = map_add(1LL, 1LL, MAP_TYPE_PRI_GPT_HDR, calloc(1, secsz)); 160 tbl = map_add(2LL, blocks, MAP_TYPE_PRI_GPT_TBL, 161 calloc(blocks, secsz)); 162 if (gpt == NULL || tbl == NULL) 163 return; 164 165 hdr = gpt->map_data; 166 memcpy(hdr->hdr_sig, GPT_HDR_SIG, sizeof(hdr->hdr_sig)); 167 hdr->hdr_revision = htole32(GPT_HDR_REVISION); 168 hdr->hdr_size = htole32(GPT_SIZE); 169 hdr->hdr_lba_self = htole64(gpt->map_start); 170 hdr->hdr_lba_alt = htole64(last); 171 hdr->hdr_lba_start = htole64(tbl->map_start + blocks); 172 hdr->hdr_lba_end = htole64(last - blocks - 1LL); 173 uuid_create(&uuid, NULL); 174 le_uuid_enc((uuid_t *)&hdr->hdr_uuid, &uuid); 175 hdr->hdr_lba_table = htole64(tbl->map_start); 176 hdr->hdr_entries = htole32((blocks * secsz) / sizeof(struct gpt_ent)); 177 if (le32toh(hdr->hdr_entries) > parts) 178 hdr->hdr_entries = htole32(parts); 179 hdr->hdr_entsz = htole32(sizeof(struct gpt_ent)); 180 181 ent = tbl->map_data; 182 for (i = 0; i < le32toh(hdr->hdr_entries); i++) { 183 uuid_create(&uuid, NULL); 184 le_uuid_enc((uuid_t *)&ent[i].ent_uuid, &uuid); 185 } 186 187 hdr->hdr_crc_table = htole32(crc32(ent, le32toh(hdr->hdr_entries) * 188 le32toh(hdr->hdr_entsz))); 189 hdr->hdr_crc_self = htole32(crc32(hdr, le32toh(hdr->hdr_size))); 190 191 gpt_write(fd, gpt); 192 gpt_write(fd, tbl); 193 194 /* 195 * Create backup GPT if the user didn't suppress it. 196 */ 197 if (!primary_only) { 198 tpg = map_add(last, 1LL, MAP_TYPE_SEC_GPT_HDR, 199 calloc(1, secsz)); 200 lbt = map_add(last - blocks, blocks, MAP_TYPE_SEC_GPT_TBL, 201 tbl->map_data); 202 memcpy(tpg->map_data, gpt->map_data, secsz); 203 hdr = tpg->map_data; 204 hdr->hdr_lba_self = htole64(tpg->map_start); 205 hdr->hdr_lba_alt = htole64(gpt->map_start); 206 hdr->hdr_lba_table = htole64(lbt->map_start); 207 hdr->hdr_crc_self = 0; /* Don't ever forget this! */ 208 hdr->hdr_crc_self = htole32(crc32(hdr, le32toh(hdr->hdr_size))); 209 gpt_write(fd, lbt); 210 gpt_write(fd, tpg); 211 } 212 } 213 214 int 215 cmd_create(int argc, char *argv[]) 216 { 217 int ch, fd; 218 219 while ((ch = getopt(argc, argv, "fp")) != -1) { 220 switch(ch) { 221 case 'f': 222 force = 1; 223 break; 224 case 'p': 225 primary_only = 1; 226 break; 227 default: 228 usage_create(); 229 } 230 } 231 232 if (argc == optind) 233 usage_create(); 234 235 while (optind < argc) { 236 fd = gpt_open(argv[optind++]); 237 if (fd == -1) { 238 warn("unable to open device '%s'", device_name); 239 continue; 240 } 241 242 create(fd); 243 244 gpt_close(fd); 245 } 246 247 return (0); 248 } 249