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 27 #include <sys/cdefs.h> 28 #ifdef __FBSDID 29 __FBSDID("$FreeBSD: src/sbin/gpt/remove.c,v 1.10 2006/10/04 18:20:25 marcel Exp $"); 30 #endif 31 #ifdef __RCSID 32 __RCSID("$NetBSD: remove.c,v 1.12 2013/11/28 01:37:14 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 44 #include "map.h" 45 #include "gpt.h" 46 47 static int all; 48 static uuid_t type; 49 static off_t block, size; 50 static unsigned int entry; 51 52 const char removemsg1[] = "remove -a device ..."; 53 const char removemsg2[] = "remove [-b blocknr] [-i index] [-s sectors] " 54 "[-t type] device ..."; 55 56 __dead static void 57 usage_remove(void) 58 { 59 60 fprintf(stderr, 61 "usage: %s %s\n" 62 " %s %s\n", 63 getprogname(), removemsg1, getprogname(), removemsg2); 64 exit(1); 65 } 66 67 static void 68 rem(int fd) 69 { 70 uuid_t uuid; 71 map_t *gpt, *tpg; 72 map_t *tbl, *lbt; 73 map_t *m; 74 struct gpt_hdr *hdr; 75 struct gpt_ent *ent; 76 unsigned int i; 77 78 gpt = map_find(MAP_TYPE_PRI_GPT_HDR); 79 if (gpt == NULL) { 80 warnx("%s: error: no primary GPT header; run create or recover", 81 device_name); 82 return; 83 } 84 85 tpg = map_find(MAP_TYPE_SEC_GPT_HDR); 86 if (tpg == NULL) { 87 warnx("%s: error: no secondary GPT header; run recover", 88 device_name); 89 return; 90 } 91 92 tbl = map_find(MAP_TYPE_PRI_GPT_TBL); 93 lbt = map_find(MAP_TYPE_SEC_GPT_TBL); 94 if (tbl == NULL || lbt == NULL) { 95 warnx("%s: error: run recover -- trust me", device_name); 96 return; 97 } 98 99 /* Remove all matching entries in the map. */ 100 for (m = map_first(); m != NULL; m = m->map_next) { 101 if (m->map_type != MAP_TYPE_GPT_PART || m->map_index < 1) 102 continue; 103 if (entry > 0 && entry != m->map_index) 104 continue; 105 if (block > 0 && block != m->map_start) 106 continue; 107 if (size > 0 && size != m->map_size) 108 continue; 109 110 i = m->map_index - 1; 111 112 hdr = gpt->map_data; 113 ent = (void*)((char*)tbl->map_data + i * 114 le32toh(hdr->hdr_entsz)); 115 le_uuid_dec(ent->ent_type, &uuid); 116 if (!uuid_is_nil(&type, NULL) && 117 !uuid_equal(&type, &uuid, NULL)) 118 continue; 119 120 /* Remove the primary entry by clearing the partition type. */ 121 uuid_create_nil(&uuid, NULL); 122 le_uuid_enc(ent->ent_type, &uuid); 123 124 hdr->hdr_crc_table = htole32(crc32(tbl->map_data, 125 le32toh(hdr->hdr_entries) * le32toh(hdr->hdr_entsz))); 126 hdr->hdr_crc_self = 0; 127 hdr->hdr_crc_self = htole32(crc32(hdr, le32toh(hdr->hdr_size))); 128 129 gpt_write(fd, gpt); 130 gpt_write(fd, tbl); 131 132 hdr = tpg->map_data; 133 ent = (void*)((char*)lbt->map_data + i * 134 le32toh(hdr->hdr_entsz)); 135 136 /* Remove the secondary entry. */ 137 le_uuid_enc(ent->ent_type, &uuid); 138 139 hdr->hdr_crc_table = htole32(crc32(lbt->map_data, 140 le32toh(hdr->hdr_entries) * le32toh(hdr->hdr_entsz))); 141 hdr->hdr_crc_self = 0; 142 hdr->hdr_crc_self = htole32(crc32(hdr, le32toh(hdr->hdr_size))); 143 144 gpt_write(fd, lbt); 145 gpt_write(fd, tpg); 146 printf("partition %d removed from %s\n", m->map_index, 147 device_name); 148 } 149 } 150 151 int 152 cmd_remove(int argc, char *argv[]) 153 { 154 char *p; 155 int ch, fd; 156 int64_t human_num; 157 158 /* Get the remove options */ 159 while ((ch = getopt(argc, argv, "ab:i:s:t:")) != -1) { 160 switch(ch) { 161 case 'a': 162 if (all > 0) 163 usage_remove(); 164 all = 1; 165 break; 166 case 'b': 167 if (block > 0) 168 usage_remove(); 169 if (dehumanize_number(optarg, &human_num) < 0) 170 usage_remove(); 171 block = human_num; 172 if (block < 1) 173 usage_remove(); 174 break; 175 case 'i': 176 if (entry > 0) 177 usage_remove(); 178 entry = strtoul(optarg, &p, 10); 179 if (*p != 0 || entry < 1) 180 usage_remove(); 181 break; 182 case 's': 183 if (size > 0) 184 usage_remove(); 185 size = strtoll(optarg, &p, 10); 186 if (*p != 0 || size < 1) 187 usage_remove(); 188 break; 189 case 't': 190 if (!uuid_is_nil(&type, NULL)) 191 usage_remove(); 192 if (parse_uuid(optarg, &type) != 0) 193 usage_remove(); 194 break; 195 default: 196 usage_remove(); 197 } 198 } 199 200 if (!all ^ 201 (block > 0 || entry > 0 || size > 0 || !uuid_is_nil(&type, NULL))) 202 usage_remove(); 203 204 if (argc == optind) 205 usage_remove(); 206 207 while (optind < argc) { 208 fd = gpt_open(argv[optind++]); 209 if (fd == -1) { 210 warn("unable to open device '%s'", device_name); 211 continue; 212 } 213 214 rem(fd); 215 216 gpt_close(fd); 217 } 218 219 return (0); 220 } 221