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/add.c,v 1.14 2006/06/22 22:05:28 marcel Exp $"); 30 #endif 31 #ifdef __RCSID 32 __RCSID("$NetBSD: resize.c,v 1.2 2013/11/22 03:50:05 jnemeth 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 #include <inttypes.h> 44 45 #include "map.h" 46 #include "gpt.h" 47 48 static off_t alignment, size; 49 static unsigned int entry; 50 51 const char resizemsg[] = "resize -i index [-a alignment] [-s sectors] " 52 "device ..."; 53 54 __dead static void 55 usage_resize(void) 56 { 57 58 fprintf(stderr, 59 "usage: %s %s\n", getprogname(), resizemsg); 60 exit(1); 61 } 62 63 static void 64 resize(int fd) 65 { 66 uuid_t uuid; 67 map_t *gpt, *tpg; 68 map_t *tbl, *lbt; 69 map_t *map; 70 struct gpt_hdr *hdr; 71 struct gpt_ent *ent; 72 unsigned int i; 73 off_t alignsecs, newsize; 74 75 76 gpt = map_find(MAP_TYPE_PRI_GPT_HDR); 77 ent = NULL; 78 if (gpt == NULL) { 79 warnx("%s: error: no primary GPT header; run create or recover", 80 device_name); 81 return; 82 } 83 84 tpg = map_find(MAP_TYPE_SEC_GPT_HDR); 85 if (tpg == NULL) { 86 warnx("%s: error: no secondary GPT header; run recover", 87 device_name); 88 return; 89 } 90 91 tbl = map_find(MAP_TYPE_PRI_GPT_TBL); 92 lbt = map_find(MAP_TYPE_SEC_GPT_TBL); 93 if (tbl == NULL || lbt == NULL) { 94 warnx("%s: error: run recover -- trust me", device_name); 95 return; 96 } 97 98 hdr = gpt->map_data; 99 if (entry > le32toh(hdr->hdr_entries)) { 100 warnx("%s: error: index %u out of range (%u max)", device_name, 101 entry, le32toh(hdr->hdr_entries)); 102 return; 103 } 104 105 i = entry - 1; 106 ent = (void*)((char*)tbl->map_data + i * 107 le32toh(hdr->hdr_entsz)); 108 le_uuid_dec(ent->ent_type, &uuid); 109 if (uuid_is_nil(&uuid, NULL)) { 110 warnx("%s: error: entry at index %u is unused", 111 device_name, entry); 112 return; 113 } 114 115 alignsecs = alignment / secsz; 116 117 for (map = map_first(); map != NULL; map = map->map_next) { 118 if (entry == map->map_index) 119 break; 120 } 121 if (entry != map->map_index) { 122 warnx("%s: error: could not find map entry corresponding " 123 "to index", device_name); 124 return; 125 } 126 127 if (size > 0 && size == map->map_size) 128 if (alignment == 0 || 129 (alignment > 0 && size % alignsecs == 0)) { 130 /* nothing to do */ 131 warnx("%s: partition does not need resizing", 132 device_name); 133 return; 134 } 135 136 newsize = map_resize(map, size, alignsecs); 137 if (newsize == 0 && alignment > 0 && size > 0) { 138 warnx("%s: could not resize partition with alignment " 139 "constraint", device_name); 140 newsize = map_resize(map, size, 0); 141 } 142 if (newsize == 0) { 143 warnx("%s: could not resize partition", device_name); 144 return; 145 } 146 147 ent->ent_lba_end = htole64(map->map_start + newsize - 1LL); 148 149 hdr->hdr_crc_table = htole32(crc32(tbl->map_data, 150 le32toh(hdr->hdr_entries) * le32toh(hdr->hdr_entsz))); 151 hdr->hdr_crc_self = 0; 152 hdr->hdr_crc_self = htole32(crc32(hdr, le32toh(hdr->hdr_size))); 153 154 gpt_write(fd, gpt); 155 gpt_write(fd, tbl); 156 157 hdr = tpg->map_data; 158 ent = (void*)((char*)lbt->map_data + i * le32toh(hdr->hdr_entsz)); 159 160 ent->ent_lba_end = htole64(map->map_start + newsize - 1LL); 161 162 hdr->hdr_crc_table = htole32(crc32(lbt->map_data, 163 le32toh(hdr->hdr_entries) * le32toh(hdr->hdr_entsz))); 164 hdr->hdr_crc_self = 0; 165 hdr->hdr_crc_self = htole32(crc32(hdr, le32toh(hdr->hdr_size))); 166 167 gpt_write(fd, lbt); 168 gpt_write(fd, tpg); 169 170 #ifdef __FreeBSD__ 171 printf("%sp%u resized\n", device_name, i + 1); 172 #endif 173 #ifdef __NetBSD__ 174 printf("Partition resized, use:\n"); 175 printf("\tdkctl %s addwedge <wedgename> %" PRIu64 " %" PRIu64 176 " <type>\n", device_arg, map->map_start, newsize); 177 printf("to create a wedge for it\n"); 178 #endif 179 } 180 181 int 182 cmd_resize(int argc, char *argv[]) 183 { 184 char *p; 185 int ch, fd; 186 int64_t human_num; 187 188 while ((ch = getopt(argc, argv, "a:i:s:")) != -1) { 189 switch(ch) { 190 case 'a': 191 if (alignment > 0) 192 usage_resize(); 193 if (dehumanize_number(optarg, &human_num) < 0) 194 usage_resize(); 195 alignment = human_num; 196 break; 197 case 'i': 198 if (entry > 0) 199 usage_resize(); 200 entry = strtoul(optarg, &p, 10); 201 if (*p != 0 || entry < 1) 202 usage_resize(); 203 break; 204 case 's': 205 if (size > 0) 206 usage_resize(); 207 size = strtoll(optarg, &p, 10); 208 if (*p != 0 || size < 1) 209 usage_resize(); 210 break; 211 default: 212 usage_resize(); 213 } 214 } 215 216 if (argc == optind) 217 usage_resize(); 218 219 if (entry == 0) 220 usage_resize(); 221 222 while (optind < argc) { 223 fd = gpt_open(argv[optind++]); 224 if (fd == -1) { 225 warn("unable to open device '%s'", device_name); 226 continue; 227 } 228 229 if (alignment % secsz != 0) { 230 warnx("Alignment must be a multiple of sector size; "); 231 warnx("the sector size for %s is %d bytes.", 232 device_name, secsz); 233 continue; 234 } 235 236 resize(fd); 237 238 gpt_close(fd); 239 } 240 241 return 0; 242 } 243