create.c revision 1.2
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 1.2 2006/10/15 22:36:29 christos 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 static void 51 usage_create(void) 52 { 53 54 fprintf(stderr, 55 "usage: %s [-fp] device ...\n", getprogname()); 56 exit(1); 57 } 58 59 static void 60 create(int fd) 61 { 62 uuid_t uuid; 63 off_t blocks, last; 64 map_t *gpt, *tpg; 65 map_t *tbl, *lbt; 66 map_t *map; 67 struct mbr *mbr; 68 struct gpt_hdr *hdr; 69 struct gpt_ent *ent; 70 unsigned int i; 71 72 last = mediasz / secsz - 1LL; 73 74 if (map_find(MAP_TYPE_PRI_GPT_HDR) != NULL || 75 map_find(MAP_TYPE_SEC_GPT_HDR) != NULL) { 76 warnx("%s: error: device already contains a GPT", device_name); 77 return; 78 } 79 map = map_find(MAP_TYPE_MBR); 80 if (map != NULL) { 81 if (!force) { 82 warnx("%s: error: device contains a MBR", device_name); 83 return; 84 } 85 86 /* Nuke the MBR in our internal map. */ 87 map->map_type = MAP_TYPE_UNUSED; 88 } 89 90 /* 91 * Create PMBR. 92 */ 93 if (map_find(MAP_TYPE_PMBR) == NULL) { 94 if (map_free(0LL, 1LL) == 0) { 95 warnx("%s: error: no room for the PMBR", device_name); 96 return; 97 } 98 mbr = gpt_read(fd, 0LL, 1); 99 bzero(mbr, sizeof(*mbr)); 100 mbr->mbr_sig = htole16(MBR_SIG); 101 mbr->mbr_part[0].part_shd = 0xff; 102 mbr->mbr_part[0].part_ssect = 0xff; 103 mbr->mbr_part[0].part_scyl = 0xff; 104 mbr->mbr_part[0].part_typ = 0xee; 105 mbr->mbr_part[0].part_ehd = 0xff; 106 mbr->mbr_part[0].part_esect = 0xff; 107 mbr->mbr_part[0].part_ecyl = 0xff; 108 mbr->mbr_part[0].part_start_lo = htole16(1); 109 if (last > 0xffffffff) { 110 mbr->mbr_part[0].part_size_lo = htole16(0xffff); 111 mbr->mbr_part[0].part_size_hi = htole16(0xffff); 112 } else { 113 mbr->mbr_part[0].part_size_lo = htole16(last); 114 mbr->mbr_part[0].part_size_hi = htole16(last >> 16); 115 } 116 map = map_add(0LL, 1LL, MAP_TYPE_PMBR, mbr); 117 gpt_write(fd, map); 118 } 119 120 /* Get the amount of free space after the MBR */ 121 blocks = map_free(1LL, 0LL); 122 if (blocks == 0LL) { 123 warnx("%s: error: no room for the GPT header", device_name); 124 return; 125 } 126 127 /* Don't create more than parts entries. */ 128 if ((uint64_t)(blocks - 1) * secsz > parts * sizeof(struct gpt_ent)) { 129 blocks = (parts * sizeof(struct gpt_ent)) / secsz; 130 if ((parts * sizeof(struct gpt_ent)) % secsz) 131 blocks++; 132 blocks++; /* Don't forget the header itself */ 133 } 134 135 /* Never cross the median of the device. */ 136 if ((blocks + 1LL) > ((last + 1LL) >> 1)) 137 blocks = ((last + 1LL) >> 1) - 1LL; 138 139 /* 140 * Get the amount of free space at the end of the device and 141 * calculate the size for the GPT structures. 142 */ 143 map = map_last(); 144 if (map->map_type != MAP_TYPE_UNUSED) { 145 warnx("%s: error: no room for the backup header", device_name); 146 return; 147 } 148 149 if (map->map_size < blocks) 150 blocks = map->map_size; 151 if (blocks == 1LL) { 152 warnx("%s: error: no room for the GPT table", device_name); 153 return; 154 } 155 156 blocks--; /* Number of blocks in the GPT table. */ 157 gpt = map_add(1LL, 1LL, MAP_TYPE_PRI_GPT_HDR, calloc(1, secsz)); 158 tbl = map_add(2LL, blocks, MAP_TYPE_PRI_GPT_TBL, 159 calloc(blocks, secsz)); 160 if (gpt == NULL || tbl == NULL) 161 return; 162 163 hdr = gpt->map_data; 164 memcpy(hdr->hdr_sig, GPT_HDR_SIG, sizeof(hdr->hdr_sig)); 165 hdr->hdr_revision = htole32(GPT_HDR_REVISION); 166 hdr->hdr_size = htole32(GPT_SIZE); 167 hdr->hdr_lba_self = htole64(gpt->map_start); 168 hdr->hdr_lba_alt = htole64(last); 169 hdr->hdr_lba_start = htole64(tbl->map_start + blocks); 170 hdr->hdr_lba_end = htole64(last - blocks - 1LL); 171 uuid_create(&uuid, NULL); 172 le_uuid_enc((uuid_t *)&hdr->hdr_uuid, &uuid); 173 hdr->hdr_lba_table = htole64(tbl->map_start); 174 hdr->hdr_entries = htole32((blocks * secsz) / sizeof(struct gpt_ent)); 175 if (le32toh(hdr->hdr_entries) > parts) 176 hdr->hdr_entries = htole32(parts); 177 hdr->hdr_entsz = htole32(sizeof(struct gpt_ent)); 178 179 ent = tbl->map_data; 180 for (i = 0; i < le32toh(hdr->hdr_entries); i++) { 181 uuid_create(&uuid, NULL); 182 le_uuid_enc((uuid_t *)&ent[i].ent_uuid, &uuid); 183 } 184 185 hdr->hdr_crc_table = htole32(crc32(ent, le32toh(hdr->hdr_entries) * 186 le32toh(hdr->hdr_entsz))); 187 hdr->hdr_crc_self = htole32(crc32(hdr, le32toh(hdr->hdr_size))); 188 189 gpt_write(fd, gpt); 190 gpt_write(fd, tbl); 191 192 /* 193 * Create backup GPT if the user didn't suppress it. 194 */ 195 if (!primary_only) { 196 tpg = map_add(last, 1LL, MAP_TYPE_SEC_GPT_HDR, 197 calloc(1, secsz)); 198 lbt = map_add(last - blocks, blocks, MAP_TYPE_SEC_GPT_TBL, 199 tbl->map_data); 200 memcpy(tpg->map_data, gpt->map_data, secsz); 201 hdr = tpg->map_data; 202 hdr->hdr_lba_self = htole64(tpg->map_start); 203 hdr->hdr_lba_alt = htole64(gpt->map_start); 204 hdr->hdr_lba_table = htole64(lbt->map_start); 205 hdr->hdr_crc_self = 0; /* Don't ever forget this! */ 206 hdr->hdr_crc_self = htole32(crc32(hdr, le32toh(hdr->hdr_size))); 207 gpt_write(fd, lbt); 208 gpt_write(fd, tpg); 209 } 210 } 211 212 int 213 cmd_create(int argc, char *argv[]) 214 { 215 int ch, fd; 216 217 while ((ch = getopt(argc, argv, "fp")) != -1) { 218 switch(ch) { 219 case 'f': 220 force = 1; 221 break; 222 case 'p': 223 primary_only = 1; 224 break; 225 default: 226 usage_create(); 227 } 228 } 229 230 if (argc == optind) 231 usage_create(); 232 233 while (optind < argc) { 234 fd = gpt_open(argv[optind++]); 235 if (fd == -1) { 236 warn("unable to open device '%s'", device_name); 237 continue; 238 } 239 240 create(fd); 241 242 gpt_close(fd); 243 } 244 245 return (0); 246 } 247
Indexes created Tue Sep 23 07:09:52 GMT 2025