1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2012 Andrey V. Elsukov <ae@FreeBSD.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include <sys/param.h> 33 #include <sys/bio.h> 34 #include <sys/diskmbr.h> 35 #include <sys/endian.h> 36 #include <sys/gpt.h> 37 #include <sys/kernel.h> 38 #include <sys/kobj.h> 39 #include <sys/limits.h> 40 #include <sys/lock.h> 41 #include <sys/malloc.h> 42 #include <sys/mutex.h> 43 #include <sys/queue.h> 44 #include <sys/sbuf.h> 45 #include <sys/systm.h> 46 #include <sys/sysctl.h> 47 #include <sys/uuid.h> 48 #include <geom/geom.h> 49 #include <geom/part/g_part.h> 50 51 #include "g_part_if.h" 52 53 FEATURE(geom_part_ldm, "GEOM partitioning class for LDM support"); 54 55 SYSCTL_DECL(_kern_geom_part); 56 static SYSCTL_NODE(_kern_geom_part, OID_AUTO, ldm, CTLFLAG_RW, 0, 57 "GEOM_PART_LDM Logical Disk Manager"); 58 59 static u_int ldm_debug = 0; 60 SYSCTL_UINT(_kern_geom_part_ldm, OID_AUTO, debug, 61 CTLFLAG_RWTUN, &ldm_debug, 0, "Debug level"); 62 63 /* 64 * This allows access to mirrored LDM volumes. Since we do not 65 * doing mirroring here, it is not enabled by default. 66 */ 67 static u_int show_mirrors = 0; 68 SYSCTL_UINT(_kern_geom_part_ldm, OID_AUTO, show_mirrors, 69 CTLFLAG_RWTUN, &show_mirrors, 0, "Show mirrored volumes"); 70 71 #define LDM_DEBUG(lvl, fmt, ...) do { \ 72 if (ldm_debug >= (lvl)) { \ 73 printf("GEOM_PART: " fmt "\n", __VA_ARGS__); \ 74 } \ 75 } while (0) 76 #define LDM_DUMP(buf, size) do { \ 77 if (ldm_debug > 1) { \ 78 hexdump(buf, size, NULL, 0); \ 79 } \ 80 } while (0) 81 82 /* 83 * There are internal representations of LDM structures. 84 * 85 * We do not keep all fields of on-disk structures, only most useful. 86 * All numbers in an on-disk structures are in big-endian format. 87 */ 88 89 /* 90 * Private header is 512 bytes long. There are three copies on each disk. 91 * Offset and sizes are in sectors. Location of each copy: 92 * - the first offset is relative to the disk start; 93 * - the second and third offset are relative to the LDM database start. 94 * 95 * On a disk partitioned with GPT, the LDM has not first private header. 96 */ 97 #define LDM_PH_MBRINDEX 0 98 #define LDM_PH_GPTINDEX 2 99 static const uint64_t ldm_ph_off[] = {6, 1856, 2047}; 100 #define LDM_VERSION_2K 0x2000b 101 #define LDM_VERSION_VISTA 0x2000c 102 #define LDM_PH_VERSION_OFF 0x00c 103 #define LDM_PH_DISKGUID_OFF 0x030 104 #define LDM_PH_DGGUID_OFF 0x0b0 105 #define LDM_PH_DGNAME_OFF 0x0f0 106 #define LDM_PH_START_OFF 0x11b 107 #define LDM_PH_SIZE_OFF 0x123 108 #define LDM_PH_DB_OFF 0x12b 109 #define LDM_PH_DBSIZE_OFF 0x133 110 #define LDM_PH_TH1_OFF 0x13b 111 #define LDM_PH_TH2_OFF 0x143 112 #define LDM_PH_CONFSIZE_OFF 0x153 113 #define LDM_PH_LOGSIZE_OFF 0x15b 114 #define LDM_PH_SIGN "PRIVHEAD" 115 struct ldm_privhdr { 116 struct uuid disk_guid; 117 struct uuid dg_guid; 118 u_char dg_name[32]; 119 uint64_t start; /* logical disk start */ 120 uint64_t size; /* logical disk size */ 121 uint64_t db_offset; /* LDM database start */ 122 #define LDM_DB_SIZE 2048 123 uint64_t db_size; /* LDM database size */ 124 #define LDM_TH_COUNT 2 125 uint64_t th_offset[LDM_TH_COUNT]; /* TOC header offsets */ 126 uint64_t conf_size; /* configuration size */ 127 uint64_t log_size; /* size of log */ 128 }; 129 130 /* 131 * Table of contents header is 512 bytes long. 132 * There are two identical copies at offsets from the private header. 133 * Offsets are relative to the LDM database start. 134 */ 135 #define LDM_TH_SIGN "TOCBLOCK" 136 #define LDM_TH_NAME1 "config" 137 #define LDM_TH_NAME2 "log" 138 #define LDM_TH_NAME1_OFF 0x024 139 #define LDM_TH_CONF_OFF 0x02e 140 #define LDM_TH_CONFSIZE_OFF 0x036 141 #define LDM_TH_NAME2_OFF 0x046 142 #define LDM_TH_LOG_OFF 0x050 143 #define LDM_TH_LOGSIZE_OFF 0x058 144 struct ldm_tochdr { 145 uint64_t conf_offset; /* configuration offset */ 146 uint64_t log_offset; /* log offset */ 147 }; 148 149 /* 150 * LDM database header is 512 bytes long. 151 */ 152 #define LDM_VMDB_SIGN "VMDB" 153 #define LDM_DB_LASTSEQ_OFF 0x004 154 #define LDM_DB_SIZE_OFF 0x008 155 #define LDM_DB_STATUS_OFF 0x010 156 #define LDM_DB_VERSION_OFF 0x012 157 #define LDM_DB_DGNAME_OFF 0x016 158 #define LDM_DB_DGGUID_OFF 0x035 159 struct ldm_vmdbhdr { 160 uint32_t last_seq; /* sequence number of last VBLK */ 161 uint32_t size; /* size of VBLK */ 162 }; 163 164 /* 165 * The LDM database configuration section contains VMDB header and 166 * many VBLKs. Each VBLK represents a disk group, disk partition, 167 * component or volume. 168 * 169 * The most interesting for us are volumes, they are represents 170 * partitions in the GEOM_PART meaning. But volume VBLK does not 171 * contain all information needed to create GEOM provider. And we 172 * should get this information from the related VBLK. This is how 173 * VBLK releated: 174 * Volumes <- Components <- Partitions -> Disks 175 * 176 * One volume can contain several components. In this case LDM 177 * does mirroring of volume data to each component. 178 * 179 * Also each component can contain several partitions (spanned or 180 * striped volumes). 181 */ 182 183 struct ldm_component { 184 uint64_t id; /* object id */ 185 uint64_t vol_id; /* parent volume object id */ 186 187 int count; 188 LIST_HEAD(, ldm_partition) partitions; 189 LIST_ENTRY(ldm_component) entry; 190 }; 191 192 struct ldm_volume { 193 uint64_t id; /* object id */ 194 uint64_t size; /* volume size */ 195 uint8_t number; /* used for ordering */ 196 uint8_t part_type; /* partition type */ 197 198 int count; 199 LIST_HEAD(, ldm_component) components; 200 LIST_ENTRY(ldm_volume) entry; 201 }; 202 203 struct ldm_disk { 204 uint64_t id; /* object id */ 205 struct uuid guid; /* disk guid */ 206 207 LIST_ENTRY(ldm_disk) entry; 208 }; 209 210 #if 0 211 struct ldm_disk_group { 212 uint64_t id; /* object id */ 213 struct uuid guid; /* disk group guid */ 214 u_char name[32]; /* disk group name */ 215 216 LIST_ENTRY(ldm_disk_group) entry; 217 }; 218 #endif 219 220 struct ldm_partition { 221 uint64_t id; /* object id */ 222 uint64_t disk_id; /* disk object id */ 223 uint64_t comp_id; /* parent component object id */ 224 uint64_t start; /* offset relative to disk start */ 225 uint64_t offset; /* offset for spanned volumes */ 226 uint64_t size; /* partition size */ 227 228 LIST_ENTRY(ldm_partition) entry; 229 }; 230 231 /* 232 * Each VBLK is 128 bytes long and has standard 16 bytes header. 233 * Some of VBLK's fields are fixed size, but others has variable size. 234 * Fields with variable size are prefixed with one byte length marker. 235 * Some fields are strings and also can have fixed size and variable. 236 * Strings with fixed size are NULL-terminated, others are not. 237 * All VBLKs have same several first fields: 238 * Offset Size Description 239 * ---------------+---------------+-------------------------- 240 * 0x00 16 standard VBLK header 241 * 0x10 2 update status 242 * 0x13 1 VBLK type 243 * 0x18 PS object id 244 * 0x18+ PN object name 245 * 246 * o Offset 0x18+ means '0x18 + length of all variable-width fields' 247 * o 'P' in size column means 'prefixed' (variable-width), 248 * 'S' - string, 'N' - number. 249 */ 250 #define LDM_VBLK_SIGN "VBLK" 251 #define LDM_VBLK_SEQ_OFF 0x04 252 #define LDM_VBLK_GROUP_OFF 0x08 253 #define LDM_VBLK_INDEX_OFF 0x0c 254 #define LDM_VBLK_COUNT_OFF 0x0e 255 #define LDM_VBLK_TYPE_OFF 0x13 256 #define LDM_VBLK_OID_OFF 0x18 257 struct ldm_vblkhdr { 258 uint32_t seq; /* sequence number */ 259 uint32_t group; /* group number */ 260 uint16_t index; /* index in the group */ 261 uint16_t count; /* number of entries in the group */ 262 }; 263 264 #define LDM_VBLK_T_COMPONENT 0x32 265 #define LDM_VBLK_T_PARTITION 0x33 266 #define LDM_VBLK_T_DISK 0x34 267 #define LDM_VBLK_T_DISKGROUP 0x35 268 #define LDM_VBLK_T_DISK4 0x44 269 #define LDM_VBLK_T_DISKGROUP4 0x45 270 #define LDM_VBLK_T_VOLUME 0x51 271 struct ldm_vblk { 272 uint8_t type; /* VBLK type */ 273 union { 274 uint64_t id; 275 struct ldm_volume vol; 276 struct ldm_component comp; 277 struct ldm_disk disk; 278 struct ldm_partition part; 279 #if 0 280 struct ldm_disk_group disk_group; 281 #endif 282 } u; 283 LIST_ENTRY(ldm_vblk) entry; 284 }; 285 286 /* 287 * Some VBLKs contains a bit more data than can fit into 128 bytes. These 288 * VBLKs are called eXtended VBLK. Before parsing, the data from these VBLK 289 * should be placed into continuous memory buffer. We can determine xVBLK 290 * by the count field in the standard VBLK header (count > 1). 291 */ 292 struct ldm_xvblk { 293 uint32_t group; /* xVBLK group number */ 294 uint32_t size; /* the total size of xVBLK */ 295 uint8_t map; /* bitmask of currently saved VBLKs */ 296 u_char *data; /* xVBLK data */ 297 298 LIST_ENTRY(ldm_xvblk) entry; 299 }; 300 301 /* The internal representation of LDM database. */ 302 struct ldm_db { 303 struct ldm_privhdr ph; /* private header */ 304 struct ldm_tochdr th; /* TOC header */ 305 struct ldm_vmdbhdr dh; /* VMDB header */ 306 307 LIST_HEAD(, ldm_volume) volumes; 308 LIST_HEAD(, ldm_disk) disks; 309 LIST_HEAD(, ldm_vblk) vblks; 310 LIST_HEAD(, ldm_xvblk) xvblks; 311 }; 312 313 static struct uuid gpt_uuid_ms_ldm_metadata = GPT_ENT_TYPE_MS_LDM_METADATA; 314 315 struct g_part_ldm_table { 316 struct g_part_table base; 317 uint64_t db_offset; 318 int is_gpt; 319 }; 320 struct g_part_ldm_entry { 321 struct g_part_entry base; 322 uint8_t type; 323 }; 324 325 static int g_part_ldm_add(struct g_part_table *, struct g_part_entry *, 326 struct g_part_parms *); 327 static int g_part_ldm_bootcode(struct g_part_table *, struct g_part_parms *); 328 static int g_part_ldm_create(struct g_part_table *, struct g_part_parms *); 329 static int g_part_ldm_destroy(struct g_part_table *, struct g_part_parms *); 330 static void g_part_ldm_dumpconf(struct g_part_table *, struct g_part_entry *, 331 struct sbuf *, const char *); 332 static int g_part_ldm_dumpto(struct g_part_table *, struct g_part_entry *); 333 static int g_part_ldm_modify(struct g_part_table *, struct g_part_entry *, 334 struct g_part_parms *); 335 static const char *g_part_ldm_name(struct g_part_table *, struct g_part_entry *, 336 char *, size_t); 337 static int g_part_ldm_probe(struct g_part_table *, struct g_consumer *); 338 static int g_part_ldm_read(struct g_part_table *, struct g_consumer *); 339 static const char *g_part_ldm_type(struct g_part_table *, struct g_part_entry *, 340 char *, size_t); 341 static int g_part_ldm_write(struct g_part_table *, struct g_consumer *); 342 343 static kobj_method_t g_part_ldm_methods[] = { 344 KOBJMETHOD(g_part_add, g_part_ldm_add), 345 KOBJMETHOD(g_part_bootcode, g_part_ldm_bootcode), 346 KOBJMETHOD(g_part_create, g_part_ldm_create), 347 KOBJMETHOD(g_part_destroy, g_part_ldm_destroy), 348 KOBJMETHOD(g_part_dumpconf, g_part_ldm_dumpconf), 349 KOBJMETHOD(g_part_dumpto, g_part_ldm_dumpto), 350 KOBJMETHOD(g_part_modify, g_part_ldm_modify), 351 KOBJMETHOD(g_part_name, g_part_ldm_name), 352 KOBJMETHOD(g_part_probe, g_part_ldm_probe), 353 KOBJMETHOD(g_part_read, g_part_ldm_read), 354 KOBJMETHOD(g_part_type, g_part_ldm_type), 355 KOBJMETHOD(g_part_write, g_part_ldm_write), 356 { 0, 0 } 357 }; 358 359 static struct g_part_scheme g_part_ldm_scheme = { 360 "LDM", 361 g_part_ldm_methods, 362 sizeof(struct g_part_ldm_table), 363 .gps_entrysz = sizeof(struct g_part_ldm_entry) 364 }; 365 G_PART_SCHEME_DECLARE(g_part_ldm); 366 367 static struct g_part_ldm_alias { 368 u_char typ; 369 int alias; 370 } ldm_alias_match[] = { 371 { DOSPTYP_NTFS, G_PART_ALIAS_MS_NTFS }, 372 { DOSPTYP_FAT32, G_PART_ALIAS_MS_FAT32 }, 373 { DOSPTYP_386BSD, G_PART_ALIAS_FREEBSD }, 374 { DOSPTYP_LDM, G_PART_ALIAS_MS_LDM_DATA }, 375 { DOSPTYP_LINSWP, G_PART_ALIAS_LINUX_SWAP }, 376 { DOSPTYP_LINUX, G_PART_ALIAS_LINUX_DATA }, 377 { DOSPTYP_LINLVM, G_PART_ALIAS_LINUX_LVM }, 378 { DOSPTYP_LINRAID, G_PART_ALIAS_LINUX_RAID }, 379 }; 380 381 static u_char* 382 ldm_privhdr_read(struct g_consumer *cp, uint64_t off, int *error) 383 { 384 struct g_provider *pp; 385 u_char *buf; 386 387 pp = cp->provider; 388 buf = g_read_data(cp, off, pp->sectorsize, error); 389 if (buf == NULL) 390 return (NULL); 391 392 if (memcmp(buf, LDM_PH_SIGN, strlen(LDM_PH_SIGN)) != 0) { 393 LDM_DEBUG(1, "%s: invalid LDM private header signature", 394 pp->name); 395 g_free(buf); 396 buf = NULL; 397 *error = EINVAL; 398 } 399 return (buf); 400 } 401 402 static int 403 ldm_privhdr_parse(struct g_consumer *cp, struct ldm_privhdr *hdr, 404 const u_char *buf) 405 { 406 uint32_t version; 407 int error; 408 409 memset(hdr, 0, sizeof(*hdr)); 410 version = be32dec(buf + LDM_PH_VERSION_OFF); 411 if (version != LDM_VERSION_2K && 412 version != LDM_VERSION_VISTA) { 413 LDM_DEBUG(0, "%s: unsupported LDM version %u.%u", 414 cp->provider->name, version >> 16, 415 version & 0xFFFF); 416 return (ENXIO); 417 } 418 error = parse_uuid(buf + LDM_PH_DISKGUID_OFF, &hdr->disk_guid); 419 if (error != 0) 420 return (error); 421 error = parse_uuid(buf + LDM_PH_DGGUID_OFF, &hdr->dg_guid); 422 if (error != 0) 423 return (error); 424 strncpy(hdr->dg_name, buf + LDM_PH_DGNAME_OFF, sizeof(hdr->dg_name)); 425 hdr->start = be64dec(buf + LDM_PH_START_OFF); 426 hdr->size = be64dec(buf + LDM_PH_SIZE_OFF); 427 hdr->db_offset = be64dec(buf + LDM_PH_DB_OFF); 428 hdr->db_size = be64dec(buf + LDM_PH_DBSIZE_OFF); 429 hdr->th_offset[0] = be64dec(buf + LDM_PH_TH1_OFF); 430 hdr->th_offset[1] = be64dec(buf + LDM_PH_TH2_OFF); 431 hdr->conf_size = be64dec(buf + LDM_PH_CONFSIZE_OFF); 432 hdr->log_size = be64dec(buf + LDM_PH_LOGSIZE_OFF); 433 return (0); 434 } 435 436 static int 437 ldm_privhdr_check(struct ldm_db *db, struct g_consumer *cp, int is_gpt) 438 { 439 struct g_consumer *cp2; 440 struct g_provider *pp; 441 struct ldm_privhdr hdr; 442 uint64_t offset, last; 443 int error, found, i; 444 u_char *buf; 445 446 pp = cp->provider; 447 if (is_gpt) { 448 /* 449 * The last LBA is used in several checks below, for the 450 * GPT case it should be calculated relative to the whole 451 * disk. 452 */ 453 cp2 = LIST_FIRST(&pp->geom->consumer); 454 last = 455 cp2->provider->mediasize / cp2->provider->sectorsize - 1; 456 } else 457 last = pp->mediasize / pp->sectorsize - 1; 458 for (found = 0, i = is_gpt; i < nitems(ldm_ph_off); i++) { 459 offset = ldm_ph_off[i]; 460 /* 461 * In the GPT case consumer is attached to the LDM metadata 462 * partition and we don't need add db_offset. 463 */ 464 if (!is_gpt) 465 offset += db->ph.db_offset; 466 if (i == LDM_PH_MBRINDEX) { 467 /* 468 * Prepare to errors and setup new base offset 469 * to read backup private headers. Assume that LDM 470 * database is in the last 1Mbyte area. 471 */ 472 db->ph.db_offset = last - LDM_DB_SIZE; 473 } 474 buf = ldm_privhdr_read(cp, offset * pp->sectorsize, &error); 475 if (buf == NULL) { 476 LDM_DEBUG(1, "%s: failed to read private header " 477 "%d at LBA %ju", pp->name, i, (uintmax_t)offset); 478 continue; 479 } 480 error = ldm_privhdr_parse(cp, &hdr, buf); 481 if (error != 0) { 482 LDM_DEBUG(1, "%s: failed to parse private " 483 "header %d", pp->name, i); 484 LDM_DUMP(buf, pp->sectorsize); 485 g_free(buf); 486 continue; 487 } 488 g_free(buf); 489 if (hdr.start > last || 490 hdr.start + hdr.size - 1 > last || 491 (hdr.start + hdr.size - 1 > hdr.db_offset && !is_gpt) || 492 hdr.db_size != LDM_DB_SIZE || 493 hdr.db_offset + LDM_DB_SIZE - 1 > last || 494 hdr.th_offset[0] >= LDM_DB_SIZE || 495 hdr.th_offset[1] >= LDM_DB_SIZE || 496 hdr.conf_size + hdr.log_size >= LDM_DB_SIZE) { 497 LDM_DEBUG(1, "%s: invalid values in the " 498 "private header %d", pp->name, i); 499 LDM_DEBUG(2, "%s: start: %jd, size: %jd, " 500 "db_offset: %jd, db_size: %jd, th_offset0: %jd, " 501 "th_offset1: %jd, conf_size: %jd, log_size: %jd, " 502 "last: %jd", pp->name, hdr.start, hdr.size, 503 hdr.db_offset, hdr.db_size, hdr.th_offset[0], 504 hdr.th_offset[1], hdr.conf_size, hdr.log_size, 505 last); 506 continue; 507 } 508 if (found != 0 && memcmp(&db->ph, &hdr, sizeof(hdr)) != 0) { 509 LDM_DEBUG(0, "%s: private headers are not equal", 510 pp->name); 511 if (i > 1) { 512 /* 513 * We have different headers in the LDM. 514 * We can not trust this metadata. 515 */ 516 LDM_DEBUG(0, "%s: refuse LDM metadata", 517 pp->name); 518 return (EINVAL); 519 } 520 /* 521 * We already have read primary private header 522 * and it differs from this backup one. 523 * Prefer the backup header and save it. 524 */ 525 found = 0; 526 } 527 if (found == 0) 528 memcpy(&db->ph, &hdr, sizeof(hdr)); 529 found = 1; 530 } 531 if (found == 0) { 532 LDM_DEBUG(1, "%s: valid LDM private header not found", 533 pp->name); 534 return (ENXIO); 535 } 536 return (0); 537 } 538 539 static int 540 ldm_gpt_check(struct ldm_db *db, struct g_consumer *cp) 541 { 542 struct g_part_table *gpt; 543 struct g_part_entry *e; 544 struct g_consumer *cp2; 545 int error; 546 547 cp2 = LIST_NEXT(cp, consumer); 548 g_topology_lock(); 549 gpt = cp->provider->geom->softc; 550 error = 0; 551 LIST_FOREACH(e, &gpt->gpt_entry, gpe_entry) { 552 if (cp->provider == e->gpe_pp) { 553 /* ms-ldm-metadata partition */ 554 if (e->gpe_start != db->ph.db_offset || 555 e->gpe_end != db->ph.db_offset + LDM_DB_SIZE - 1) 556 error++; 557 } else if (cp2->provider == e->gpe_pp) { 558 /* ms-ldm-data partition */ 559 if (e->gpe_start != db->ph.start || 560 e->gpe_end != db->ph.start + db->ph.size - 1) 561 error++; 562 } 563 if (error != 0) { 564 LDM_DEBUG(0, "%s: GPT partition %d boundaries " 565 "do not match with the LDM metadata", 566 e->gpe_pp->name, e->gpe_index); 567 error = ENXIO; 568 break; 569 } 570 } 571 g_topology_unlock(); 572 return (error); 573 } 574 575 static int 576 ldm_tochdr_check(struct ldm_db *db, struct g_consumer *cp) 577 { 578 struct g_provider *pp; 579 struct ldm_tochdr hdr; 580 uint64_t offset, conf_size, log_size; 581 int error, found, i; 582 u_char *buf; 583 584 pp = cp->provider; 585 for (i = 0, found = 0; i < LDM_TH_COUNT; i++) { 586 offset = db->ph.db_offset + db->ph.th_offset[i]; 587 buf = g_read_data(cp, 588 offset * pp->sectorsize, pp->sectorsize, &error); 589 if (buf == NULL) { 590 LDM_DEBUG(1, "%s: failed to read TOC header " 591 "at LBA %ju", pp->name, (uintmax_t)offset); 592 continue; 593 } 594 if (memcmp(buf, LDM_TH_SIGN, strlen(LDM_TH_SIGN)) != 0 || 595 memcmp(buf + LDM_TH_NAME1_OFF, LDM_TH_NAME1, 596 strlen(LDM_TH_NAME1)) != 0 || 597 memcmp(buf + LDM_TH_NAME2_OFF, LDM_TH_NAME2, 598 strlen(LDM_TH_NAME2)) != 0) { 599 LDM_DEBUG(1, "%s: failed to parse TOC header " 600 "at LBA %ju", pp->name, (uintmax_t)offset); 601 LDM_DUMP(buf, pp->sectorsize); 602 g_free(buf); 603 continue; 604 } 605 hdr.conf_offset = be64dec(buf + LDM_TH_CONF_OFF); 606 hdr.log_offset = be64dec(buf + LDM_TH_LOG_OFF); 607 conf_size = be64dec(buf + LDM_TH_CONFSIZE_OFF); 608 log_size = be64dec(buf + LDM_TH_LOGSIZE_OFF); 609 if (conf_size != db->ph.conf_size || 610 hdr.conf_offset + conf_size >= LDM_DB_SIZE || 611 log_size != db->ph.log_size || 612 hdr.log_offset + log_size >= LDM_DB_SIZE) { 613 LDM_DEBUG(1, "%s: invalid values in the " 614 "TOC header at LBA %ju", pp->name, 615 (uintmax_t)offset); 616 LDM_DUMP(buf, pp->sectorsize); 617 g_free(buf); 618 continue; 619 } 620 g_free(buf); 621 if (found == 0) 622 memcpy(&db->th, &hdr, sizeof(hdr)); 623 found = 1; 624 } 625 if (found == 0) { 626 LDM_DEBUG(0, "%s: valid LDM TOC header not found.", 627 pp->name); 628 return (ENXIO); 629 } 630 return (0); 631 } 632 633 static int 634 ldm_vmdbhdr_check(struct ldm_db *db, struct g_consumer *cp) 635 { 636 struct g_provider *pp; 637 struct uuid dg_guid; 638 uint64_t offset; 639 uint32_t version; 640 int error; 641 u_char *buf; 642 643 pp = cp->provider; 644 offset = db->ph.db_offset + db->th.conf_offset; 645 buf = g_read_data(cp, offset * pp->sectorsize, pp->sectorsize, 646 &error); 647 if (buf == NULL) { 648 LDM_DEBUG(0, "%s: failed to read VMDB header at " 649 "LBA %ju", pp->name, (uintmax_t)offset); 650 return (error); 651 } 652 if (memcmp(buf, LDM_VMDB_SIGN, strlen(LDM_VMDB_SIGN)) != 0) { 653 g_free(buf); 654 LDM_DEBUG(0, "%s: failed to parse VMDB header at " 655 "LBA %ju", pp->name, (uintmax_t)offset); 656 return (ENXIO); 657 } 658 /* Check version. */ 659 version = be32dec(buf + LDM_DB_VERSION_OFF); 660 if (version != 0x4000A) { 661 g_free(buf); 662 LDM_DEBUG(0, "%s: unsupported VMDB version %u.%u", 663 pp->name, version >> 16, version & 0xFFFF); 664 return (ENXIO); 665 } 666 /* 667 * Check VMDB update status: 668 * 1 - in a consistent state; 669 * 2 - in a creation phase; 670 * 3 - in a deletion phase; 671 */ 672 if (be16dec(buf + LDM_DB_STATUS_OFF) != 1) { 673 g_free(buf); 674 LDM_DEBUG(0, "%s: VMDB is not in a consistent state", 675 pp->name); 676 return (ENXIO); 677 } 678 db->dh.last_seq = be32dec(buf + LDM_DB_LASTSEQ_OFF); 679 db->dh.size = be32dec(buf + LDM_DB_SIZE_OFF); 680 error = parse_uuid(buf + LDM_DB_DGGUID_OFF, &dg_guid); 681 /* Compare disk group name and guid from VMDB and private headers */ 682 if (error != 0 || db->dh.size == 0 || 683 pp->sectorsize % db->dh.size != 0 || 684 strncmp(buf + LDM_DB_DGNAME_OFF, db->ph.dg_name, 31) != 0 || 685 memcmp(&dg_guid, &db->ph.dg_guid, sizeof(dg_guid)) != 0 || 686 db->dh.size * db->dh.last_seq > 687 db->ph.conf_size * pp->sectorsize) { 688 LDM_DEBUG(0, "%s: invalid values in the VMDB header", 689 pp->name); 690 LDM_DUMP(buf, pp->sectorsize); 691 g_free(buf); 692 return (EINVAL); 693 } 694 g_free(buf); 695 return (0); 696 } 697 698 static int 699 ldm_xvblk_handle(struct ldm_db *db, struct ldm_vblkhdr *vh, const u_char *p) 700 { 701 struct ldm_xvblk *blk; 702 size_t size; 703 704 size = db->dh.size - 16; 705 LIST_FOREACH(blk, &db->xvblks, entry) 706 if (blk->group == vh->group) 707 break; 708 if (blk == NULL) { 709 blk = g_malloc(sizeof(*blk), M_WAITOK | M_ZERO); 710 blk->group = vh->group; 711 blk->size = size * vh->count + 16; 712 blk->data = g_malloc(blk->size, M_WAITOK | M_ZERO); 713 blk->map = 0xFF << vh->count; 714 LIST_INSERT_HEAD(&db->xvblks, blk, entry); 715 } 716 if ((blk->map & (1 << vh->index)) != 0) { 717 /* Block with given index has been already saved. */ 718 return (EINVAL); 719 } 720 /* Copy the data block to the place related to index. */ 721 memcpy(blk->data + size * vh->index + 16, p + 16, size); 722 blk->map |= 1 << vh->index; 723 return (0); 724 } 725 726 /* Read the variable-width numeric field and return new offset */ 727 static int 728 ldm_vnum_get(const u_char *buf, int offset, uint64_t *result, size_t range) 729 { 730 uint64_t num; 731 uint8_t len; 732 733 len = buf[offset++]; 734 if (len > sizeof(uint64_t) || len + offset >= range) 735 return (-1); 736 for (num = 0; len > 0; len--) 737 num = (num << 8) | buf[offset++]; 738 *result = num; 739 return (offset); 740 } 741 742 /* Read the variable-width string and return new offset */ 743 static int 744 ldm_vstr_get(const u_char *buf, int offset, u_char *result, 745 size_t maxlen, size_t range) 746 { 747 uint8_t len; 748 749 len = buf[offset++]; 750 if (len >= maxlen || len + offset >= range) 751 return (-1); 752 memcpy(result, buf + offset, len); 753 result[len] = '\0'; 754 return (offset + len); 755 } 756 757 /* Just skip the variable-width variable and return new offset */ 758 static int 759 ldm_vparm_skip(const u_char *buf, int offset, size_t range) 760 { 761 uint8_t len; 762 763 len = buf[offset++]; 764 if (offset + len >= range) 765 return (-1); 766 767 return (offset + len); 768 } 769 770 static int 771 ldm_vblk_handle(struct ldm_db *db, const u_char *p, size_t size) 772 { 773 struct ldm_vblk *blk; 774 struct ldm_volume *volume, *last; 775 const char *errstr; 776 u_char vstr[64]; 777 int error, offset; 778 779 blk = g_malloc(sizeof(*blk), M_WAITOK | M_ZERO); 780 blk->type = p[LDM_VBLK_TYPE_OFF]; 781 offset = ldm_vnum_get(p, LDM_VBLK_OID_OFF, &blk->u.id, size); 782 if (offset < 0) { 783 errstr = "object id"; 784 goto fail; 785 } 786 offset = ldm_vstr_get(p, offset, vstr, sizeof(vstr), size); 787 if (offset < 0) { 788 errstr = "object name"; 789 goto fail; 790 } 791 switch (blk->type) { 792 /* 793 * Component VBLK fields: 794 * Offset Size Description 795 * ------------+-------+------------------------ 796 * 0x18+ PS volume state 797 * 0x18+5 PN component children count 798 * 0x1D+16 PN parent's volume object id 799 * 0x2D+1 PN stripe size 800 */ 801 case LDM_VBLK_T_COMPONENT: 802 offset = ldm_vparm_skip(p, offset, size); 803 if (offset < 0) { 804 errstr = "volume state"; 805 goto fail; 806 } 807 offset = ldm_vparm_skip(p, offset + 5, size); 808 if (offset < 0) { 809 errstr = "children count"; 810 goto fail; 811 } 812 offset = ldm_vnum_get(p, offset + 16, 813 &blk->u.comp.vol_id, size); 814 if (offset < 0) { 815 errstr = "volume id"; 816 goto fail; 817 } 818 break; 819 /* 820 * Partition VBLK fields: 821 * Offset Size Description 822 * ------------+-------+------------------------ 823 * 0x18+12 8 partition start offset 824 * 0x18+20 8 volume offset 825 * 0x18+28 PN partition size 826 * 0x34+ PN parent's component object id 827 * 0x34+ PN disk's object id 828 */ 829 case LDM_VBLK_T_PARTITION: 830 if (offset + 28 >= size) { 831 errstr = "too small buffer"; 832 goto fail; 833 } 834 blk->u.part.start = be64dec(p + offset + 12); 835 blk->u.part.offset = be64dec(p + offset + 20); 836 offset = ldm_vnum_get(p, offset + 28, &blk->u.part.size, size); 837 if (offset < 0) { 838 errstr = "partition size"; 839 goto fail; 840 } 841 offset = ldm_vnum_get(p, offset, &blk->u.part.comp_id, size); 842 if (offset < 0) { 843 errstr = "component id"; 844 goto fail; 845 } 846 offset = ldm_vnum_get(p, offset, &blk->u.part.disk_id, size); 847 if (offset < 0) { 848 errstr = "disk id"; 849 goto fail; 850 } 851 break; 852 /* 853 * Disk VBLK fields: 854 * Offset Size Description 855 * ------------+-------+------------------------ 856 * 0x18+ PS disk GUID 857 */ 858 case LDM_VBLK_T_DISK: 859 errstr = "disk guid"; 860 offset = ldm_vstr_get(p, offset, vstr, sizeof(vstr), size); 861 if (offset < 0) 862 goto fail; 863 error = parse_uuid(vstr, &blk->u.disk.guid); 864 if (error != 0) 865 goto fail; 866 LIST_INSERT_HEAD(&db->disks, &blk->u.disk, entry); 867 break; 868 /* 869 * Disk group VBLK fields: 870 * Offset Size Description 871 * ------------+-------+------------------------ 872 * 0x18+ PS disk group GUID 873 */ 874 case LDM_VBLK_T_DISKGROUP: 875 #if 0 876 strncpy(blk->u.disk_group.name, vstr, 877 sizeof(blk->u.disk_group.name)); 878 offset = ldm_vstr_get(p, offset, vstr, sizeof(vstr), size); 879 if (offset < 0) { 880 errstr = "disk group guid"; 881 goto fail; 882 } 883 error = parse_uuid(name, &blk->u.disk_group.guid); 884 if (error != 0) { 885 errstr = "disk group guid"; 886 goto fail; 887 } 888 LIST_INSERT_HEAD(&db->groups, &blk->u.disk_group, entry); 889 #endif 890 break; 891 /* 892 * Disk VBLK fields: 893 * Offset Size Description 894 * ------------+-------+------------------------ 895 * 0x18+ 16 disk GUID 896 */ 897 case LDM_VBLK_T_DISK4: 898 be_uuid_dec(p + offset, &blk->u.disk.guid); 899 LIST_INSERT_HEAD(&db->disks, &blk->u.disk, entry); 900 break; 901 /* 902 * Disk group VBLK fields: 903 * Offset Size Description 904 * ------------+-------+------------------------ 905 * 0x18+ 16 disk GUID 906 */ 907 case LDM_VBLK_T_DISKGROUP4: 908 #if 0 909 strncpy(blk->u.disk_group.name, vstr, 910 sizeof(blk->u.disk_group.name)); 911 be_uuid_dec(p + offset, &blk->u.disk.guid); 912 LIST_INSERT_HEAD(&db->groups, &blk->u.disk_group, entry); 913 #endif 914 break; 915 /* 916 * Volume VBLK fields: 917 * Offset Size Description 918 * ------------+-------+------------------------ 919 * 0x18+ PS volume type 920 * 0x18+ PS unknown 921 * 0x18+ 14(S) volume state 922 * 0x18+16 1 volume number 923 * 0x18+21 PN volume children count 924 * 0x2D+16 PN volume size 925 * 0x3D+4 1 partition type 926 */ 927 case LDM_VBLK_T_VOLUME: 928 offset = ldm_vparm_skip(p, offset, size); 929 if (offset < 0) { 930 errstr = "volume type"; 931 goto fail; 932 } 933 offset = ldm_vparm_skip(p, offset, size); 934 if (offset < 0) { 935 errstr = "unknown param"; 936 goto fail; 937 } 938 if (offset + 21 >= size) { 939 errstr = "too small buffer"; 940 goto fail; 941 } 942 blk->u.vol.number = p[offset + 16]; 943 offset = ldm_vparm_skip(p, offset + 21, size); 944 if (offset < 0) { 945 errstr = "children count"; 946 goto fail; 947 } 948 offset = ldm_vnum_get(p, offset + 16, &blk->u.vol.size, size); 949 if (offset < 0) { 950 errstr = "volume size"; 951 goto fail; 952 } 953 if (offset + 4 >= size) { 954 errstr = "too small buffer"; 955 goto fail; 956 } 957 blk->u.vol.part_type = p[offset + 4]; 958 /* keep volumes ordered by volume number */ 959 last = NULL; 960 LIST_FOREACH(volume, &db->volumes, entry) { 961 if (volume->number > blk->u.vol.number) 962 break; 963 last = volume; 964 } 965 if (last != NULL) 966 LIST_INSERT_AFTER(last, &blk->u.vol, entry); 967 else 968 LIST_INSERT_HEAD(&db->volumes, &blk->u.vol, entry); 969 break; 970 default: 971 LDM_DEBUG(1, "unknown VBLK type 0x%02x\n", blk->type); 972 LDM_DUMP(p, size); 973 } 974 LIST_INSERT_HEAD(&db->vblks, blk, entry); 975 return (0); 976 fail: 977 LDM_DEBUG(0, "failed to parse '%s' in VBLK of type 0x%02x\n", 978 errstr, blk->type); 979 LDM_DUMP(p, size); 980 g_free(blk); 981 return (EINVAL); 982 } 983 984 static void 985 ldm_vmdb_free(struct ldm_db *db) 986 { 987 struct ldm_vblk *vblk; 988 struct ldm_xvblk *xvblk; 989 990 while (!LIST_EMPTY(&db->xvblks)) { 991 xvblk = LIST_FIRST(&db->xvblks); 992 LIST_REMOVE(xvblk, entry); 993 g_free(xvblk->data); 994 g_free(xvblk); 995 } 996 while (!LIST_EMPTY(&db->vblks)) { 997 vblk = LIST_FIRST(&db->vblks); 998 LIST_REMOVE(vblk, entry); 999 g_free(vblk); 1000 } 1001 } 1002 1003 static int 1004 ldm_vmdb_parse(struct ldm_db *db, struct g_consumer *cp) 1005 { 1006 struct g_provider *pp; 1007 struct ldm_vblk *vblk; 1008 struct ldm_xvblk *xvblk; 1009 struct ldm_volume *volume; 1010 struct ldm_component *comp; 1011 struct ldm_vblkhdr vh; 1012 u_char *buf, *p; 1013 size_t size, n, sectors; 1014 uint64_t offset; 1015 int error; 1016 1017 pp = cp->provider; 1018 size = howmany(db->dh.last_seq * db->dh.size, pp->sectorsize); 1019 size -= 1; /* one sector takes vmdb header */ 1020 for (n = 0; n < size; n += MAXPHYS / pp->sectorsize) { 1021 offset = db->ph.db_offset + db->th.conf_offset + n + 1; 1022 sectors = (size - n) > (MAXPHYS / pp->sectorsize) ? 1023 MAXPHYS / pp->sectorsize: size - n; 1024 /* read VBLKs */ 1025 buf = g_read_data(cp, offset * pp->sectorsize, 1026 sectors * pp->sectorsize, &error); 1027 if (buf == NULL) { 1028 LDM_DEBUG(0, "%s: failed to read VBLK\n", 1029 pp->name); 1030 goto fail; 1031 } 1032 for (p = buf; p < buf + sectors * pp->sectorsize; 1033 p += db->dh.size) { 1034 if (memcmp(p, LDM_VBLK_SIGN, 1035 strlen(LDM_VBLK_SIGN)) != 0) { 1036 LDM_DEBUG(0, "%s: no VBLK signature\n", 1037 pp->name); 1038 LDM_DUMP(p, db->dh.size); 1039 goto fail; 1040 } 1041 vh.seq = be32dec(p + LDM_VBLK_SEQ_OFF); 1042 vh.group = be32dec(p + LDM_VBLK_GROUP_OFF); 1043 /* skip empty blocks */ 1044 if (vh.seq == 0 || vh.group == 0) 1045 continue; 1046 vh.index = be16dec(p + LDM_VBLK_INDEX_OFF); 1047 vh.count = be16dec(p + LDM_VBLK_COUNT_OFF); 1048 if (vh.count == 0 || vh.count > 4 || 1049 vh.seq > db->dh.last_seq) { 1050 LDM_DEBUG(0, "%s: invalid values " 1051 "in the VBLK header\n", pp->name); 1052 LDM_DUMP(p, db->dh.size); 1053 goto fail; 1054 } 1055 if (vh.count > 1) { 1056 error = ldm_xvblk_handle(db, &vh, p); 1057 if (error != 0) { 1058 LDM_DEBUG(0, "%s: xVBLK " 1059 "is corrupted\n", pp->name); 1060 LDM_DUMP(p, db->dh.size); 1061 goto fail; 1062 } 1063 continue; 1064 } 1065 if (be16dec(p + 16) != 0) 1066 LDM_DEBUG(1, "%s: VBLK update" 1067 " status is %u\n", pp->name, 1068 be16dec(p + 16)); 1069 error = ldm_vblk_handle(db, p, db->dh.size); 1070 if (error != 0) 1071 goto fail; 1072 } 1073 g_free(buf); 1074 buf = NULL; 1075 } 1076 /* Parse xVBLKs */ 1077 while (!LIST_EMPTY(&db->xvblks)) { 1078 xvblk = LIST_FIRST(&db->xvblks); 1079 if (xvblk->map == 0xFF) { 1080 error = ldm_vblk_handle(db, xvblk->data, xvblk->size); 1081 if (error != 0) 1082 goto fail; 1083 } else { 1084 LDM_DEBUG(0, "%s: incomplete or corrupt " 1085 "xVBLK found\n", pp->name); 1086 goto fail; 1087 } 1088 LIST_REMOVE(xvblk, entry); 1089 g_free(xvblk->data); 1090 g_free(xvblk); 1091 } 1092 /* construct all VBLKs relations */ 1093 LIST_FOREACH(volume, &db->volumes, entry) { 1094 LIST_FOREACH(vblk, &db->vblks, entry) 1095 if (vblk->type == LDM_VBLK_T_COMPONENT && 1096 vblk->u.comp.vol_id == volume->id) { 1097 LIST_INSERT_HEAD(&volume->components, 1098 &vblk->u.comp, entry); 1099 volume->count++; 1100 } 1101 LIST_FOREACH(comp, &volume->components, entry) 1102 LIST_FOREACH(vblk, &db->vblks, entry) 1103 if (vblk->type == LDM_VBLK_T_PARTITION && 1104 vblk->u.part.comp_id == comp->id) { 1105 LIST_INSERT_HEAD(&comp->partitions, 1106 &vblk->u.part, entry); 1107 comp->count++; 1108 } 1109 } 1110 return (0); 1111 fail: 1112 ldm_vmdb_free(db); 1113 g_free(buf); 1114 return (ENXIO); 1115 } 1116 1117 static int 1118 g_part_ldm_add(struct g_part_table *basetable, struct g_part_entry *baseentry, 1119 struct g_part_parms *gpp) 1120 { 1121 1122 return (ENOSYS); 1123 } 1124 1125 static int 1126 g_part_ldm_bootcode(struct g_part_table *basetable, struct g_part_parms *gpp) 1127 { 1128 1129 return (ENOSYS); 1130 } 1131 1132 static int 1133 g_part_ldm_create(struct g_part_table *basetable, struct g_part_parms *gpp) 1134 { 1135 1136 return (ENOSYS); 1137 } 1138 1139 static int 1140 g_part_ldm_destroy(struct g_part_table *basetable, struct g_part_parms *gpp) 1141 { 1142 struct g_part_ldm_table *table; 1143 struct g_provider *pp; 1144 1145 table = (struct g_part_ldm_table *)basetable; 1146 /* 1147 * To destroy LDM on a disk partitioned with GPT we should delete 1148 * ms-ldm-metadata partition, but we can't do this via standard 1149 * GEOM_PART method. 1150 */ 1151 if (table->is_gpt) 1152 return (ENOSYS); 1153 pp = LIST_FIRST(&basetable->gpt_gp->consumer)->provider; 1154 /* 1155 * To destroy LDM we should wipe MBR, first private header and 1156 * backup private headers. 1157 */ 1158 basetable->gpt_smhead = (1 << ldm_ph_off[0]) | 1; 1159 /* 1160 * Don't touch last backup private header when LDM database is 1161 * not located in the last 1MByte area. 1162 * XXX: can't remove all blocks. 1163 */ 1164 if (table->db_offset + LDM_DB_SIZE == 1165 pp->mediasize / pp->sectorsize) 1166 basetable->gpt_smtail = 1; 1167 return (0); 1168 } 1169 1170 static void 1171 g_part_ldm_dumpconf(struct g_part_table *basetable, 1172 struct g_part_entry *baseentry, struct sbuf *sb, const char *indent) 1173 { 1174 struct g_part_ldm_entry *entry; 1175 1176 entry = (struct g_part_ldm_entry *)baseentry; 1177 if (indent == NULL) { 1178 /* conftxt: libdisk compatibility */ 1179 sbuf_printf(sb, " xs LDM xt %u", entry->type); 1180 } else if (entry != NULL) { 1181 /* confxml: partition entry information */ 1182 sbuf_printf(sb, "%s<rawtype>%u</rawtype>\n", indent, 1183 entry->type); 1184 } else { 1185 /* confxml: scheme information */ 1186 } 1187 } 1188 1189 static int 1190 g_part_ldm_dumpto(struct g_part_table *table, struct g_part_entry *baseentry) 1191 { 1192 1193 return (0); 1194 } 1195 1196 static int 1197 g_part_ldm_modify(struct g_part_table *basetable, 1198 struct g_part_entry *baseentry, struct g_part_parms *gpp) 1199 { 1200 1201 return (ENOSYS); 1202 } 1203 1204 static const char * 1205 g_part_ldm_name(struct g_part_table *table, struct g_part_entry *baseentry, 1206 char *buf, size_t bufsz) 1207 { 1208 1209 snprintf(buf, bufsz, "s%d", baseentry->gpe_index); 1210 return (buf); 1211 } 1212 1213 static int 1214 ldm_gpt_probe(struct g_part_table *basetable, struct g_consumer *cp) 1215 { 1216 struct g_part_ldm_table *table; 1217 struct g_part_table *gpt; 1218 struct g_part_entry *entry; 1219 struct g_consumer *cp2; 1220 struct gpt_ent *part; 1221 u_char *buf; 1222 int error; 1223 1224 /* 1225 * XXX: We use some knowledge about GEOM_PART_GPT internal 1226 * structures, but it is easier than parse GPT by himself. 1227 */ 1228 g_topology_lock(); 1229 gpt = cp->provider->geom->softc; 1230 LIST_FOREACH(entry, &gpt->gpt_entry, gpe_entry) { 1231 part = (struct gpt_ent *)(entry + 1); 1232 /* Search ms-ldm-metadata partition */ 1233 if (memcmp(&part->ent_type, 1234 &gpt_uuid_ms_ldm_metadata, sizeof(struct uuid)) != 0 || 1235 entry->gpe_end - entry->gpe_start < LDM_DB_SIZE - 1) 1236 continue; 1237 1238 /* Create new consumer and attach it to metadata partition */ 1239 cp2 = g_new_consumer(cp->geom); 1240 error = g_attach(cp2, entry->gpe_pp); 1241 if (error != 0) { 1242 g_destroy_consumer(cp2); 1243 g_topology_unlock(); 1244 return (ENXIO); 1245 } 1246 error = g_access(cp2, 1, 0, 0); 1247 if (error != 0) { 1248 g_detach(cp2); 1249 g_destroy_consumer(cp2); 1250 g_topology_unlock(); 1251 return (ENXIO); 1252 } 1253 g_topology_unlock(); 1254 1255 LDM_DEBUG(2, "%s: LDM metadata partition %s found in the GPT", 1256 cp->provider->name, cp2->provider->name); 1257 /* Read the LDM private header */ 1258 buf = ldm_privhdr_read(cp2, 1259 ldm_ph_off[LDM_PH_GPTINDEX] * cp2->provider->sectorsize, 1260 &error); 1261 if (buf != NULL) { 1262 table = (struct g_part_ldm_table *)basetable; 1263 table->is_gpt = 1; 1264 g_free(buf); 1265 return (G_PART_PROBE_PRI_HIGH); 1266 } 1267 1268 /* second consumer is no longer needed. */ 1269 g_topology_lock(); 1270 g_access(cp2, -1, 0, 0); 1271 g_detach(cp2); 1272 g_destroy_consumer(cp2); 1273 break; 1274 } 1275 g_topology_unlock(); 1276 return (ENXIO); 1277 } 1278 1279 static int 1280 g_part_ldm_probe(struct g_part_table *basetable, struct g_consumer *cp) 1281 { 1282 struct g_provider *pp; 1283 u_char *buf, type[64]; 1284 int error, idx; 1285 1286 1287 pp = cp->provider; 1288 if (pp->sectorsize != 512) 1289 return (ENXIO); 1290 1291 error = g_getattr("PART::scheme", cp, &type); 1292 if (error == 0 && strcmp(type, "GPT") == 0) { 1293 if (g_getattr("PART::type", cp, &type) != 0 || 1294 strcmp(type, "ms-ldm-data") != 0) 1295 return (ENXIO); 1296 error = ldm_gpt_probe(basetable, cp); 1297 return (error); 1298 } 1299 1300 if (basetable->gpt_depth != 0) 1301 return (ENXIO); 1302 1303 /* LDM has 1M metadata area */ 1304 if (pp->mediasize <= 1024 * 1024) 1305 return (ENOSPC); 1306 1307 /* Check that there's a MBR */ 1308 buf = g_read_data(cp, 0, pp->sectorsize, &error); 1309 if (buf == NULL) 1310 return (error); 1311 1312 if (le16dec(buf + DOSMAGICOFFSET) != DOSMAGIC) { 1313 g_free(buf); 1314 return (ENXIO); 1315 } 1316 error = ENXIO; 1317 /* Check that we have LDM partitions in the MBR */ 1318 for (idx = 0; idx < NDOSPART && error != 0; idx++) { 1319 if (buf[DOSPARTOFF + idx * DOSPARTSIZE + 4] == DOSPTYP_LDM) 1320 error = 0; 1321 } 1322 g_free(buf); 1323 if (error == 0) { 1324 LDM_DEBUG(2, "%s: LDM data partitions found in MBR", 1325 pp->name); 1326 /* Read the LDM private header */ 1327 buf = ldm_privhdr_read(cp, 1328 ldm_ph_off[LDM_PH_MBRINDEX] * pp->sectorsize, &error); 1329 if (buf == NULL) 1330 return (error); 1331 g_free(buf); 1332 return (G_PART_PROBE_PRI_HIGH); 1333 } 1334 return (error); 1335 } 1336 1337 static int 1338 g_part_ldm_read(struct g_part_table *basetable, struct g_consumer *cp) 1339 { 1340 struct g_part_ldm_table *table; 1341 struct g_part_ldm_entry *entry; 1342 struct g_consumer *cp2; 1343 struct ldm_component *comp; 1344 struct ldm_partition *part; 1345 struct ldm_volume *vol; 1346 struct ldm_disk *disk; 1347 struct ldm_db db; 1348 int error, index, skipped; 1349 1350 table = (struct g_part_ldm_table *)basetable; 1351 memset(&db, 0, sizeof(db)); 1352 cp2 = cp; /* ms-ldm-data */ 1353 if (table->is_gpt) 1354 cp = LIST_FIRST(&cp->geom->consumer); /* ms-ldm-metadata */ 1355 /* Read and parse LDM private headers. */ 1356 error = ldm_privhdr_check(&db, cp, table->is_gpt); 1357 if (error != 0) 1358 goto gpt_cleanup; 1359 basetable->gpt_first = table->is_gpt ? 0: db.ph.start; 1360 basetable->gpt_last = basetable->gpt_first + db.ph.size - 1; 1361 table->db_offset = db.ph.db_offset; 1362 /* Make additional checks for GPT */ 1363 if (table->is_gpt) { 1364 error = ldm_gpt_check(&db, cp); 1365 if (error != 0) 1366 goto gpt_cleanup; 1367 /* 1368 * Now we should reset database offset to zero, because our 1369 * consumer cp is attached to the ms-ldm-metadata partition 1370 * and we don't need add db_offset to read from it. 1371 */ 1372 db.ph.db_offset = 0; 1373 } 1374 /* Read and parse LDM TOC headers. */ 1375 error = ldm_tochdr_check(&db, cp); 1376 if (error != 0) 1377 goto gpt_cleanup; 1378 /* Read and parse LDM VMDB header. */ 1379 error = ldm_vmdbhdr_check(&db, cp); 1380 if (error != 0) 1381 goto gpt_cleanup; 1382 error = ldm_vmdb_parse(&db, cp); 1383 /* 1384 * For the GPT case we must detach and destroy 1385 * second consumer before return. 1386 */ 1387 gpt_cleanup: 1388 if (table->is_gpt) { 1389 g_topology_lock(); 1390 g_access(cp, -1, 0, 0); 1391 g_detach(cp); 1392 g_destroy_consumer(cp); 1393 g_topology_unlock(); 1394 cp = cp2; 1395 } 1396 if (error != 0) 1397 return (error); 1398 /* Search current disk in the disk list. */ 1399 LIST_FOREACH(disk, &db.disks, entry) 1400 if (memcmp(&disk->guid, &db.ph.disk_guid, 1401 sizeof(struct uuid)) == 0) 1402 break; 1403 if (disk == NULL) { 1404 LDM_DEBUG(1, "%s: no LDM volumes on this disk", 1405 cp->provider->name); 1406 ldm_vmdb_free(&db); 1407 return (ENXIO); 1408 } 1409 index = 1; 1410 LIST_FOREACH(vol, &db.volumes, entry) { 1411 LIST_FOREACH(comp, &vol->components, entry) { 1412 /* Skip volumes from different disks. */ 1413 part = LIST_FIRST(&comp->partitions); 1414 if (part->disk_id != disk->id) 1415 continue; 1416 skipped = 0; 1417 /* We don't support spanned and striped volumes. */ 1418 if (comp->count > 1 || part->offset != 0) { 1419 LDM_DEBUG(1, "%s: LDM volume component " 1420 "%ju has %u partitions. Skipped", 1421 cp->provider->name, (uintmax_t)comp->id, 1422 comp->count); 1423 skipped = 1; 1424 } 1425 /* 1426 * Allow mirrored volumes only when they are explicitly 1427 * allowed with kern.geom.part.ldm.show_mirrors=1. 1428 */ 1429 if (vol->count > 1 && show_mirrors == 0) { 1430 LDM_DEBUG(1, "%s: LDM volume %ju has %u " 1431 "components. Skipped", 1432 cp->provider->name, (uintmax_t)vol->id, 1433 vol->count); 1434 skipped = 1; 1435 } 1436 entry = (struct g_part_ldm_entry *)g_part_new_entry( 1437 basetable, index++, 1438 basetable->gpt_first + part->start, 1439 basetable->gpt_first + part->start + 1440 part->size - 1); 1441 /* 1442 * Mark skipped partition as ms-ldm-data partition. 1443 * We do not support them, but it is better to show 1444 * that we have something there, than just show 1445 * free space. 1446 */ 1447 if (skipped == 0) 1448 entry->type = vol->part_type; 1449 else 1450 entry->type = DOSPTYP_LDM; 1451 LDM_DEBUG(1, "%s: new volume id: %ju, start: %ju," 1452 " end: %ju, type: 0x%02x\n", cp->provider->name, 1453 (uintmax_t)part->id,(uintmax_t)part->start + 1454 basetable->gpt_first, (uintmax_t)part->start + 1455 part->size + basetable->gpt_first - 1, 1456 vol->part_type); 1457 } 1458 } 1459 ldm_vmdb_free(&db); 1460 return (error); 1461 } 1462 1463 static const char * 1464 g_part_ldm_type(struct g_part_table *basetable, struct g_part_entry *baseentry, 1465 char *buf, size_t bufsz) 1466 { 1467 struct g_part_ldm_entry *entry; 1468 int i; 1469 1470 entry = (struct g_part_ldm_entry *)baseentry; 1471 for (i = 0; i < nitems(ldm_alias_match); i++) { 1472 if (ldm_alias_match[i].typ == entry->type) 1473 return (g_part_alias_name(ldm_alias_match[i].alias)); 1474 } 1475 snprintf(buf, bufsz, "!%d", entry->type); 1476 return (buf); 1477 } 1478 1479 static int 1480 g_part_ldm_write(struct g_part_table *basetable, struct g_consumer *cp) 1481 { 1482 1483 return (ENOSYS); 1484 } 1485