1 /*- 2 * Copyright (c) 2012 Andrey V. Elsukov <ae@FreeBSD.org> 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 __FBSDID("$FreeBSD$"); 29 30 #include <sys/param.h> 31 #include <sys/bio.h> 32 #include <sys/diskmbr.h> 33 #include <sys/endian.h> 34 #include <sys/gpt.h> 35 #include <sys/kernel.h> 36 #include <sys/kobj.h> 37 #include <sys/limits.h> 38 #include <sys/lock.h> 39 #include <sys/malloc.h> 40 #include <sys/mutex.h> 41 #include <sys/queue.h> 42 #include <sys/sbuf.h> 43 #include <sys/systm.h> 44 #include <sys/sysctl.h> 45 #include <sys/uuid.h> 46 #include <geom/geom.h> 47 #include <geom/part/g_part.h> 48 49 #include "g_part_if.h" 50 51 FEATURE(geom_part_ldm, "GEOM partitioning class for LDM support"); 52 53 SYSCTL_DECL(_kern_geom_part); 54 static SYSCTL_NODE(_kern_geom_part, OID_AUTO, ldm, CTLFLAG_RW, 0, 55 "GEOM_PART_LDM Logical Disk Manager"); 56 57 static u_int ldm_debug = 0; 58 SYSCTL_UINT(_kern_geom_part_ldm, OID_AUTO, debug, 59 CTLFLAG_RWTUN, &ldm_debug, 0, "Debug level"); 60 61 /* 62 * This allows access to mirrored LDM volumes. Since we do not 63 * doing mirroring here, it is not enabled by default. 64 */ 65 static u_int show_mirrors = 0; 66 SYSCTL_UINT(_kern_geom_part_ldm, OID_AUTO, show_mirrors, 67 CTLFLAG_RWTUN, &show_mirrors, 0, "Show mirrored volumes"); 68 69 #define LDM_DEBUG(lvl, fmt, ...) do { \ 70 if (ldm_debug >= (lvl)) { \ 71 printf("GEOM_PART: " fmt "\n", __VA_ARGS__); \ 72 } \ 73 } while (0) 74 #define LDM_DUMP(buf, size) do { \ 75 if (ldm_debug > 1) { \ 76 hexdump(buf, size, NULL, 0); \ 77 } \ 78 } while (0) 79 80 /* 81 * There are internal representations of LDM structures. 82 * 83 * We do not keep all fields of on-disk structures, only most useful. 84 * All numbers in an on-disk structures are in big-endian format. 85 */ 86 87 /* 88 * Private header is 512 bytes long. There are three copies on each disk. 89 * Offset and sizes are in sectors. Location of each copy: 90 * - the first offset is relative to the disk start; 91 * - the second and third offset are relative to the LDM database start. 92 * 93 * On a disk partitioned with GPT, the LDM has not first private header. 94 */ 95 #define LDM_PH_MBRINDEX 0 96 #define LDM_PH_GPTINDEX 2 97 static const uint64_t ldm_ph_off[] = {6, 1856, 2047}; 98 #define LDM_VERSION_2K 0x2000b 99 #define LDM_VERSION_VISTA 0x2000c 100 #define LDM_PH_VERSION_OFF 0x00c 101 #define LDM_PH_DISKGUID_OFF 0x030 102 #define LDM_PH_DGGUID_OFF 0x0b0 103 #define LDM_PH_DGNAME_OFF 0x0f0 104 #define LDM_PH_START_OFF 0x11b 105 #define LDM_PH_SIZE_OFF 0x123 106 #define LDM_PH_DB_OFF 0x12b 107 #define LDM_PH_DBSIZE_OFF 0x133 108 #define LDM_PH_TH1_OFF 0x13b 109 #define LDM_PH_TH2_OFF 0x143 110 #define LDM_PH_CONFSIZE_OFF 0x153 111 #define LDM_PH_LOGSIZE_OFF 0x15b 112 #define LDM_PH_SIGN "PRIVHEAD" 113 struct ldm_privhdr { 114 struct uuid disk_guid; 115 struct uuid dg_guid; 116 u_char dg_name[32]; 117 uint64_t start; /* logical disk start */ 118 uint64_t size; /* logical disk size */ 119 uint64_t db_offset; /* LDM database start */ 120 #define LDM_DB_SIZE 2048 121 uint64_t db_size; /* LDM database size */ 122 #define LDM_TH_COUNT 2 123 uint64_t th_offset[LDM_TH_COUNT]; /* TOC header offsets */ 124 uint64_t conf_size; /* configuration size */ 125 uint64_t log_size; /* size of log */ 126 }; 127 128 /* 129 * Table of contents header is 512 bytes long. 130 * There are two identical copies at offsets from the private header. 131 * Offsets are relative to the LDM database start. 132 */ 133 #define LDM_TH_SIGN "TOCBLOCK" 134 #define LDM_TH_NAME1 "config" 135 #define LDM_TH_NAME2 "log" 136 #define LDM_TH_NAME1_OFF 0x024 137 #define LDM_TH_CONF_OFF 0x02e 138 #define LDM_TH_CONFSIZE_OFF 0x036 139 #define LDM_TH_NAME2_OFF 0x046 140 #define LDM_TH_LOG_OFF 0x050 141 #define LDM_TH_LOGSIZE_OFF 0x058 142 struct ldm_tochdr { 143 uint64_t conf_offset; /* configuration offset */ 144 uint64_t log_offset; /* log offset */ 145 }; 146 147 /* 148 * LDM database header is 512 bytes long. 149 */ 150 #define LDM_VMDB_SIGN "VMDB" 151 #define LDM_DB_LASTSEQ_OFF 0x004 152 #define LDM_DB_SIZE_OFF 0x008 153 #define LDM_DB_STATUS_OFF 0x010 154 #define LDM_DB_VERSION_OFF 0x012 155 #define LDM_DB_DGNAME_OFF 0x016 156 #define LDM_DB_DGGUID_OFF 0x035 157 struct ldm_vmdbhdr { 158 uint32_t last_seq; /* sequence number of last VBLK */ 159 uint32_t size; /* size of VBLK */ 160 }; 161 162 /* 163 * The LDM database configuration section contains VMDB header and 164 * many VBLKs. Each VBLK represents a disk group, disk partition, 165 * component or volume. 166 * 167 * The most interesting for us are volumes, they are represents 168 * partitions in the GEOM_PART meaning. But volume VBLK does not 169 * contain all information needed to create GEOM provider. And we 170 * should get this information from the related VBLK. This is how 171 * VBLK releated: 172 * Volumes <- Components <- Partitions -> Disks 173 * 174 * One volume can contain several components. In this case LDM 175 * does mirroring of volume data to each component. 176 * 177 * Also each component can contain several partitions (spanned or 178 * striped volumes). 179 */ 180 181 struct ldm_component { 182 uint64_t id; /* object id */ 183 uint64_t vol_id; /* parent volume object id */ 184 185 int count; 186 LIST_HEAD(, ldm_partition) partitions; 187 LIST_ENTRY(ldm_component) entry; 188 }; 189 190 struct ldm_volume { 191 uint64_t id; /* object id */ 192 uint64_t size; /* volume size */ 193 uint8_t number; /* used for ordering */ 194 uint8_t part_type; /* partition type */ 195 196 int count; 197 LIST_HEAD(, ldm_component) components; 198 LIST_ENTRY(ldm_volume) entry; 199 }; 200 201 struct ldm_disk { 202 uint64_t id; /* object id */ 203 struct uuid guid; /* disk guid */ 204 205 LIST_ENTRY(ldm_disk) entry; 206 }; 207 208 #if 0 209 struct ldm_disk_group { 210 uint64_t id; /* object id */ 211 struct uuid guid; /* disk group guid */ 212 u_char name[32]; /* disk group name */ 213 214 LIST_ENTRY(ldm_disk_group) entry; 215 }; 216 #endif 217 218 struct ldm_partition { 219 uint64_t id; /* object id */ 220 uint64_t disk_id; /* disk object id */ 221 uint64_t comp_id; /* parent component object id */ 222 uint64_t start; /* offset relative to disk start */ 223 uint64_t offset; /* offset for spanned volumes */ 224 uint64_t size; /* partition size */ 225 226 LIST_ENTRY(ldm_partition) entry; 227 }; 228 229 /* 230 * Each VBLK is 128 bytes long and has standard 16 bytes header. 231 * Some of VBLK's fields are fixed size, but others has variable size. 232 * Fields with variable size are prefixed with one byte length marker. 233 * Some fields are strings and also can have fixed size and variable. 234 * Strings with fixed size are NULL-terminated, others are not. 235 * All VBLKs have same several first fields: 236 * Offset Size Description 237 * ---------------+---------------+-------------------------- 238 * 0x00 16 standard VBLK header 239 * 0x10 2 update status 240 * 0x13 1 VBLK type 241 * 0x18 PS object id 242 * 0x18+ PN object name 243 * 244 * o Offset 0x18+ means '0x18 + length of all variable-width fields' 245 * o 'P' in size column means 'prefixed' (variable-width), 246 * 'S' - string, 'N' - number. 247 */ 248 #define LDM_VBLK_SIGN "VBLK" 249 #define LDM_VBLK_SEQ_OFF 0x04 250 #define LDM_VBLK_GROUP_OFF 0x08 251 #define LDM_VBLK_INDEX_OFF 0x0c 252 #define LDM_VBLK_COUNT_OFF 0x0e 253 #define LDM_VBLK_TYPE_OFF 0x13 254 #define LDM_VBLK_OID_OFF 0x18 255 struct ldm_vblkhdr { 256 uint32_t seq; /* sequence number */ 257 uint32_t group; /* group number */ 258 uint16_t index; /* index in the group */ 259 uint16_t count; /* number of entries in the group */ 260 }; 261 262 #define LDM_VBLK_T_COMPONENT 0x32 263 #define LDM_VBLK_T_PARTITION 0x33 264 #define LDM_VBLK_T_DISK 0x34 265 #define LDM_VBLK_T_DISKGROUP 0x35 266 #define LDM_VBLK_T_DISK4 0x44 267 #define LDM_VBLK_T_DISKGROUP4 0x45 268 #define LDM_VBLK_T_VOLUME 0x51 269 struct ldm_vblk { 270 uint8_t type; /* VBLK type */ 271 union { 272 uint64_t id; 273 struct ldm_volume vol; 274 struct ldm_component comp; 275 struct ldm_disk disk; 276 struct ldm_partition part; 277 #if 0 278 struct ldm_disk_group disk_group; 279 #endif 280 } u; 281 LIST_ENTRY(ldm_vblk) entry; 282 }; 283 284 /* 285 * Some VBLKs contains a bit more data than can fit into 128 bytes. These 286 * VBLKs are called eXtended VBLK. Before parsing, the data from these VBLK 287 * should be placed into continuous memory buffer. We can determine xVBLK 288 * by the count field in the standard VBLK header (count > 1). 289 */ 290 struct ldm_xvblk { 291 uint32_t group; /* xVBLK group number */ 292 uint32_t size; /* the total size of xVBLK */ 293 uint8_t map; /* bitmask of currently saved VBLKs */ 294 u_char *data; /* xVBLK data */ 295 296 LIST_ENTRY(ldm_xvblk) entry; 297 }; 298 299 /* The internal representation of LDM database. */ 300 struct ldm_db { 301 struct ldm_privhdr ph; /* private header */ 302 struct ldm_tochdr th; /* TOC header */ 303 struct ldm_vmdbhdr dh; /* VMDB header */ 304 305 LIST_HEAD(, ldm_volume) volumes; 306 LIST_HEAD(, ldm_disk) disks; 307 LIST_HEAD(, ldm_vblk) vblks; 308 LIST_HEAD(, ldm_xvblk) xvblks; 309 }; 310 311 static struct uuid gpt_uuid_ms_ldm_metadata = GPT_ENT_TYPE_MS_LDM_METADATA; 312 313 struct g_part_ldm_table { 314 struct g_part_table base; 315 uint64_t db_offset; 316 int is_gpt; 317 }; 318 struct g_part_ldm_entry { 319 struct g_part_entry base; 320 uint8_t type; 321 }; 322 323 static int g_part_ldm_add(struct g_part_table *, struct g_part_entry *, 324 struct g_part_parms *); 325 static int g_part_ldm_bootcode(struct g_part_table *, struct g_part_parms *); 326 static int g_part_ldm_create(struct g_part_table *, struct g_part_parms *); 327 static int g_part_ldm_destroy(struct g_part_table *, struct g_part_parms *); 328 static void g_part_ldm_dumpconf(struct g_part_table *, struct g_part_entry *, 329 struct sbuf *, const char *); 330 static int g_part_ldm_dumpto(struct g_part_table *, struct g_part_entry *); 331 static int g_part_ldm_modify(struct g_part_table *, struct g_part_entry *, 332 struct g_part_parms *); 333 static const char *g_part_ldm_name(struct g_part_table *, struct g_part_entry *, 334 char *, size_t); 335 static int g_part_ldm_probe(struct g_part_table *, struct g_consumer *); 336 static int g_part_ldm_read(struct g_part_table *, struct g_consumer *); 337 static const char *g_part_ldm_type(struct g_part_table *, struct g_part_entry *, 338 char *, size_t); 339 static int g_part_ldm_write(struct g_part_table *, struct g_consumer *); 340 341 static kobj_method_t g_part_ldm_methods[] = { 342 KOBJMETHOD(g_part_add, g_part_ldm_add), 343 KOBJMETHOD(g_part_bootcode, g_part_ldm_bootcode), 344 KOBJMETHOD(g_part_create, g_part_ldm_create), 345 KOBJMETHOD(g_part_destroy, g_part_ldm_destroy), 346 KOBJMETHOD(g_part_dumpconf, g_part_ldm_dumpconf), 347 KOBJMETHOD(g_part_dumpto, g_part_ldm_dumpto), 348 KOBJMETHOD(g_part_modify, g_part_ldm_modify), 349 KOBJMETHOD(g_part_name, g_part_ldm_name), 350 KOBJMETHOD(g_part_probe, g_part_ldm_probe), 351 KOBJMETHOD(g_part_read, g_part_ldm_read), 352 KOBJMETHOD(g_part_type, g_part_ldm_type), 353 KOBJMETHOD(g_part_write, g_part_ldm_write), 354 { 0, 0 } 355 }; 356 357 static struct g_part_scheme g_part_ldm_scheme = { 358 "LDM", 359 g_part_ldm_methods, 360 sizeof(struct g_part_ldm_table), 361 .gps_entrysz = sizeof(struct g_part_ldm_entry) 362 }; 363 G_PART_SCHEME_DECLARE(g_part_ldm); 364 365 static struct g_part_ldm_alias { 366 u_char typ; 367 int alias; 368 } ldm_alias_match[] = { 369 { DOSPTYP_NTFS, G_PART_ALIAS_MS_NTFS }, 370 { DOSPTYP_FAT32, G_PART_ALIAS_MS_FAT32 }, 371 { DOSPTYP_386BSD, G_PART_ALIAS_FREEBSD }, 372 { DOSPTYP_LDM, G_PART_ALIAS_MS_LDM_DATA }, 373 { DOSPTYP_LINSWP, G_PART_ALIAS_LINUX_SWAP }, 374 { DOSPTYP_LINUX, G_PART_ALIAS_LINUX_DATA }, 375 { DOSPTYP_LINLVM, G_PART_ALIAS_LINUX_LVM }, 376 { DOSPTYP_LINRAID, G_PART_ALIAS_LINUX_RAID }, 377 }; 378 379 static u_char* 380 ldm_privhdr_read(struct g_consumer *cp, uint64_t off, int *error) 381 { 382 struct g_provider *pp; 383 u_char *buf; 384 385 pp = cp->provider; 386 buf = g_read_data(cp, off, pp->sectorsize, error); 387 if (buf == NULL) 388 return (NULL); 389 390 if (memcmp(buf, LDM_PH_SIGN, strlen(LDM_PH_SIGN)) != 0) { 391 LDM_DEBUG(1, "%s: invalid LDM private header signature", 392 pp->name); 393 g_free(buf); 394 buf = NULL; 395 *error = EINVAL; 396 } 397 return (buf); 398 } 399 400 static int 401 ldm_privhdr_parse(struct g_consumer *cp, struct ldm_privhdr *hdr, 402 const u_char *buf) 403 { 404 uint32_t version; 405 int error; 406 407 memset(hdr, 0, sizeof(*hdr)); 408 version = be32dec(buf + LDM_PH_VERSION_OFF); 409 if (version != LDM_VERSION_2K && 410 version != LDM_VERSION_VISTA) { 411 LDM_DEBUG(0, "%s: unsupported LDM version %u.%u", 412 cp->provider->name, version >> 16, 413 version & 0xFFFF); 414 return (ENXIO); 415 } 416 error = parse_uuid(buf + LDM_PH_DISKGUID_OFF, &hdr->disk_guid); 417 if (error != 0) 418 return (error); 419 error = parse_uuid(buf + LDM_PH_DGGUID_OFF, &hdr->dg_guid); 420 if (error != 0) 421 return (error); 422 strncpy(hdr->dg_name, buf + LDM_PH_DGNAME_OFF, sizeof(hdr->dg_name)); 423 hdr->start = be64dec(buf + LDM_PH_START_OFF); 424 hdr->size = be64dec(buf + LDM_PH_SIZE_OFF); 425 hdr->db_offset = be64dec(buf + LDM_PH_DB_OFF); 426 hdr->db_size = be64dec(buf + LDM_PH_DBSIZE_OFF); 427 hdr->th_offset[0] = be64dec(buf + LDM_PH_TH1_OFF); 428 hdr->th_offset[1] = be64dec(buf + LDM_PH_TH2_OFF); 429 hdr->conf_size = be64dec(buf + LDM_PH_CONFSIZE_OFF); 430 hdr->log_size = be64dec(buf + LDM_PH_LOGSIZE_OFF); 431 return (0); 432 } 433 434 static int 435 ldm_privhdr_check(struct ldm_db *db, struct g_consumer *cp, int is_gpt) 436 { 437 struct g_consumer *cp2; 438 struct g_provider *pp; 439 struct ldm_privhdr hdr; 440 uint64_t offset, last; 441 int error, found, i; 442 u_char *buf; 443 444 pp = cp->provider; 445 if (is_gpt) { 446 /* 447 * The last LBA is used in several checks below, for the 448 * GPT case it should be calculated relative to the whole 449 * disk. 450 */ 451 cp2 = LIST_FIRST(&pp->geom->consumer); 452 last = 453 cp2->provider->mediasize / cp2->provider->sectorsize - 1; 454 } else 455 last = pp->mediasize / pp->sectorsize - 1; 456 for (found = 0, i = is_gpt; 457 i < sizeof(ldm_ph_off) / sizeof(ldm_ph_off[0]); i++) { 458 offset = ldm_ph_off[i]; 459 /* 460 * In the GPT case consumer is attached to the LDM metadata 461 * partition and we don't need add db_offset. 462 */ 463 if (!is_gpt) 464 offset += db->ph.db_offset; 465 if (i == LDM_PH_MBRINDEX) { 466 /* 467 * Prepare to errors and setup new base offset 468 * to read backup private headers. Assume that LDM 469 * database is in the last 1Mbyte area. 470 */ 471 db->ph.db_offset = last - LDM_DB_SIZE; 472 } 473 buf = ldm_privhdr_read(cp, offset * pp->sectorsize, &error); 474 if (buf == NULL) { 475 LDM_DEBUG(1, "%s: failed to read private header " 476 "%d at LBA %ju", pp->name, i, (uintmax_t)offset); 477 continue; 478 } 479 error = ldm_privhdr_parse(cp, &hdr, buf); 480 if (error != 0) { 481 LDM_DEBUG(1, "%s: failed to parse private " 482 "header %d", pp->name, i); 483 LDM_DUMP(buf, pp->sectorsize); 484 g_free(buf); 485 continue; 486 } 487 g_free(buf); 488 if (hdr.start > last || 489 hdr.start + hdr.size - 1 > last || 490 (hdr.start + hdr.size - 1 > hdr.db_offset && !is_gpt) || 491 hdr.db_size != LDM_DB_SIZE || 492 hdr.db_offset + LDM_DB_SIZE - 1 > last || 493 hdr.th_offset[0] >= LDM_DB_SIZE || 494 hdr.th_offset[1] >= LDM_DB_SIZE || 495 hdr.conf_size + hdr.log_size >= LDM_DB_SIZE) { 496 LDM_DEBUG(1, "%s: invalid values in the " 497 "private header %d", pp->name, i); 498 LDM_DEBUG(2, "%s: start: %jd, size: %jd, " 499 "db_offset: %jd, db_size: %jd, th_offset0: %jd, " 500 "th_offset1: %jd, conf_size: %jd, log_size: %jd, " 501 "last: %jd", pp->name, hdr.start, hdr.size, 502 hdr.db_offset, hdr.db_size, hdr.th_offset[0], 503 hdr.th_offset[1], hdr.conf_size, hdr.log_size, 504 last); 505 continue; 506 } 507 if (found != 0 && memcmp(&db->ph, &hdr, sizeof(hdr)) != 0) { 508 LDM_DEBUG(0, "%s: private headers are not equal", 509 pp->name); 510 if (i > 1) { 511 /* 512 * We have different headers in the LDM. 513 * We can not trust this metadata. 514 */ 515 LDM_DEBUG(0, "%s: refuse LDM metadata", 516 pp->name); 517 return (EINVAL); 518 } 519 /* 520 * We already have read primary private header 521 * and it differs from this backup one. 522 * Prefer the backup header and save it. 523 */ 524 found = 0; 525 } 526 if (found == 0) 527 memcpy(&db->ph, &hdr, sizeof(hdr)); 528 found = 1; 529 } 530 if (found == 0) { 531 LDM_DEBUG(1, "%s: valid LDM private header not found", 532 pp->name); 533 return (ENXIO); 534 } 535 return (0); 536 } 537 538 static int 539 ldm_gpt_check(struct ldm_db *db, struct g_consumer *cp) 540 { 541 struct g_part_table *gpt; 542 struct g_part_entry *e; 543 struct g_consumer *cp2; 544 int error; 545 546 cp2 = LIST_NEXT(cp, consumer); 547 g_topology_lock(); 548 gpt = cp->provider->geom->softc; 549 error = 0; 550 LIST_FOREACH(e, &gpt->gpt_entry, gpe_entry) { 551 if (cp->provider == e->gpe_pp) { 552 /* ms-ldm-metadata partition */ 553 if (e->gpe_start != db->ph.db_offset || 554 e->gpe_end != db->ph.db_offset + LDM_DB_SIZE - 1) 555 error++; 556 } else if (cp2->provider == e->gpe_pp) { 557 /* ms-ldm-data partition */ 558 if (e->gpe_start != db->ph.start || 559 e->gpe_end != db->ph.start + db->ph.size - 1) 560 error++; 561 } 562 if (error != 0) { 563 LDM_DEBUG(0, "%s: GPT partition %d boundaries " 564 "do not match with the LDM metadata", 565 e->gpe_pp->name, e->gpe_index); 566 error = ENXIO; 567 break; 568 } 569 } 570 g_topology_unlock(); 571 return (error); 572 } 573 574 static int 575 ldm_tochdr_check(struct ldm_db *db, struct g_consumer *cp) 576 { 577 struct g_provider *pp; 578 struct ldm_tochdr hdr; 579 uint64_t offset, conf_size, log_size; 580 int error, found, i; 581 u_char *buf; 582 583 pp = cp->provider; 584 for (i = 0, found = 0; i < LDM_TH_COUNT; i++) { 585 offset = db->ph.db_offset + db->ph.th_offset[i]; 586 buf = g_read_data(cp, 587 offset * pp->sectorsize, pp->sectorsize, &error); 588 if (buf == NULL) { 589 LDM_DEBUG(1, "%s: failed to read TOC header " 590 "at LBA %ju", pp->name, (uintmax_t)offset); 591 continue; 592 } 593 if (memcmp(buf, LDM_TH_SIGN, strlen(LDM_TH_SIGN)) != 0 || 594 memcmp(buf + LDM_TH_NAME1_OFF, LDM_TH_NAME1, 595 strlen(LDM_TH_NAME1)) != 0 || 596 memcmp(buf + LDM_TH_NAME2_OFF, LDM_TH_NAME2, 597 strlen(LDM_TH_NAME2)) != 0) { 598 LDM_DEBUG(1, "%s: failed to parse TOC header " 599 "at LBA %ju", pp->name, (uintmax_t)offset); 600 LDM_DUMP(buf, pp->sectorsize); 601 g_free(buf); 602 continue; 603 } 604 hdr.conf_offset = be64dec(buf + LDM_TH_CONF_OFF); 605 hdr.log_offset = be64dec(buf + LDM_TH_LOG_OFF); 606 conf_size = be64dec(buf + LDM_TH_CONFSIZE_OFF); 607 log_size = be64dec(buf + LDM_TH_LOGSIZE_OFF); 608 if (conf_size != db->ph.conf_size || 609 hdr.conf_offset + conf_size >= LDM_DB_SIZE || 610 log_size != db->ph.log_size || 611 hdr.log_offset + log_size >= LDM_DB_SIZE) { 612 LDM_DEBUG(1, "%s: invalid values in the " 613 "TOC header at LBA %ju", pp->name, 614 (uintmax_t)offset); 615 LDM_DUMP(buf, pp->sectorsize); 616 g_free(buf); 617 continue; 618 } 619 g_free(buf); 620 if (found == 0) 621 memcpy(&db->th, &hdr, sizeof(hdr)); 622 found = 1; 623 } 624 if (found == 0) { 625 LDM_DEBUG(0, "%s: valid LDM TOC header not found.", 626 pp->name); 627 return (ENXIO); 628 } 629 return (0); 630 } 631 632 static int 633 ldm_vmdbhdr_check(struct ldm_db *db, struct g_consumer *cp) 634 { 635 struct g_provider *pp; 636 struct uuid dg_guid; 637 uint64_t offset; 638 uint32_t version; 639 int error; 640 u_char *buf; 641 642 pp = cp->provider; 643 offset = db->ph.db_offset + db->th.conf_offset; 644 buf = g_read_data(cp, offset * pp->sectorsize, pp->sectorsize, 645 &error); 646 if (buf == NULL) { 647 LDM_DEBUG(0, "%s: failed to read VMDB header at " 648 "LBA %ju", pp->name, (uintmax_t)offset); 649 return (error); 650 } 651 if (memcmp(buf, LDM_VMDB_SIGN, strlen(LDM_VMDB_SIGN)) != 0) { 652 g_free(buf); 653 LDM_DEBUG(0, "%s: failed to parse VMDB header at " 654 "LBA %ju", pp->name, (uintmax_t)offset); 655 return (ENXIO); 656 } 657 /* Check version. */ 658 version = be32dec(buf + LDM_DB_VERSION_OFF); 659 if (version != 0x4000A) { 660 g_free(buf); 661 LDM_DEBUG(0, "%s: unsupported VMDB version %u.%u", 662 pp->name, version >> 16, version & 0xFFFF); 663 return (ENXIO); 664 } 665 /* 666 * Check VMDB update status: 667 * 1 - in a consistent state; 668 * 2 - in a creation phase; 669 * 3 - in a deletion phase; 670 */ 671 if (be16dec(buf + LDM_DB_STATUS_OFF) != 1) { 672 g_free(buf); 673 LDM_DEBUG(0, "%s: VMDB is not in a consistent state", 674 pp->name); 675 return (ENXIO); 676 } 677 db->dh.last_seq = be32dec(buf + LDM_DB_LASTSEQ_OFF); 678 db->dh.size = be32dec(buf + LDM_DB_SIZE_OFF); 679 error = parse_uuid(buf + LDM_DB_DGGUID_OFF, &dg_guid); 680 /* Compare disk group name and guid from VMDB and private headers */ 681 if (error != 0 || db->dh.size == 0 || 682 pp->sectorsize % db->dh.size != 0 || 683 strncmp(buf + LDM_DB_DGNAME_OFF, db->ph.dg_name, 31) != 0 || 684 memcmp(&dg_guid, &db->ph.dg_guid, sizeof(dg_guid)) != 0 || 685 db->dh.size * db->dh.last_seq > 686 db->ph.conf_size * pp->sectorsize) { 687 LDM_DEBUG(0, "%s: invalid values in the VMDB header", 688 pp->name); 689 LDM_DUMP(buf, pp->sectorsize); 690 g_free(buf); 691 return (EINVAL); 692 } 693 g_free(buf); 694 return (0); 695 } 696 697 static int 698 ldm_xvblk_handle(struct ldm_db *db, struct ldm_vblkhdr *vh, const u_char *p) 699 { 700 struct ldm_xvblk *blk; 701 size_t size; 702 703 size = db->dh.size - 16; 704 LIST_FOREACH(blk, &db->xvblks, entry) 705 if (blk->group == vh->group) 706 break; 707 if (blk == NULL) { 708 blk = g_malloc(sizeof(*blk), M_WAITOK | M_ZERO); 709 blk->group = vh->group; 710 blk->size = size * vh->count + 16; 711 blk->data = g_malloc(blk->size, M_WAITOK | M_ZERO); 712 blk->map = 0xFF << vh->count; 713 LIST_INSERT_HEAD(&db->xvblks, blk, entry); 714 } 715 if ((blk->map & (1 << vh->index)) != 0) { 716 /* Block with given index has been already saved. */ 717 return (EINVAL); 718 } 719 /* Copy the data block to the place related to index. */ 720 memcpy(blk->data + size * vh->index + 16, p + 16, size); 721 blk->map |= 1 << vh->index; 722 return (0); 723 } 724 725 /* Read the variable-width numeric field and return new offset */ 726 static int 727 ldm_vnum_get(const u_char *buf, int offset, uint64_t *result, size_t range) 728 { 729 uint64_t num; 730 uint8_t len; 731 732 len = buf[offset++]; 733 if (len > sizeof(uint64_t) || len + offset >= range) 734 return (-1); 735 for (num = 0; len > 0; len--) 736 num = (num << 8) | buf[offset++]; 737 *result = num; 738 return (offset); 739 } 740 741 /* Read the variable-width string and return new offset */ 742 static int 743 ldm_vstr_get(const u_char *buf, int offset, u_char *result, 744 size_t maxlen, size_t range) 745 { 746 uint8_t len; 747 748 len = buf[offset++]; 749 if (len >= maxlen || len + offset >= range) 750 return (-1); 751 memcpy(result, buf + offset, len); 752 result[len] = '\0'; 753 return (offset + len); 754 } 755 756 /* Just skip the variable-width variable and return new offset */ 757 static int 758 ldm_vparm_skip(const u_char *buf, int offset, size_t range) 759 { 760 uint8_t len; 761 762 len = buf[offset++]; 763 if (offset + len >= range) 764 return (-1); 765 766 return (offset + len); 767 } 768 769 static int 770 ldm_vblk_handle(struct ldm_db *db, const u_char *p, size_t size) 771 { 772 struct ldm_vblk *blk; 773 struct ldm_volume *volume, *last; 774 const char *errstr; 775 u_char vstr[64]; 776 int error, offset; 777 778 blk = g_malloc(sizeof(*blk), M_WAITOK | M_ZERO); 779 blk->type = p[LDM_VBLK_TYPE_OFF]; 780 offset = ldm_vnum_get(p, LDM_VBLK_OID_OFF, &blk->u.id, size); 781 if (offset < 0) { 782 errstr = "object id"; 783 goto fail; 784 } 785 offset = ldm_vstr_get(p, offset, vstr, sizeof(vstr), size); 786 if (offset < 0) { 787 errstr = "object name"; 788 goto fail; 789 } 790 switch (blk->type) { 791 /* 792 * Component VBLK fields: 793 * Offset Size Description 794 * ------------+-------+------------------------ 795 * 0x18+ PS volume state 796 * 0x18+5 PN component children count 797 * 0x1D+16 PN parent's volume object id 798 * 0x2D+1 PN stripe size 799 */ 800 case LDM_VBLK_T_COMPONENT: 801 offset = ldm_vparm_skip(p, offset, size); 802 if (offset < 0) { 803 errstr = "volume state"; 804 goto fail; 805 } 806 offset = ldm_vparm_skip(p, offset + 5, size); 807 if (offset < 0) { 808 errstr = "children count"; 809 goto fail; 810 } 811 offset = ldm_vnum_get(p, offset + 16, 812 &blk->u.comp.vol_id, size); 813 if (offset < 0) { 814 errstr = "volume id"; 815 goto fail; 816 } 817 break; 818 /* 819 * Partition VBLK fields: 820 * Offset Size Description 821 * ------------+-------+------------------------ 822 * 0x18+12 8 partition start offset 823 * 0x18+20 8 volume offset 824 * 0x18+28 PN partition size 825 * 0x34+ PN parent's component object id 826 * 0x34+ PN disk's object id 827 */ 828 case LDM_VBLK_T_PARTITION: 829 if (offset + 28 >= size) { 830 errstr = "too small buffer"; 831 goto fail; 832 } 833 blk->u.part.start = be64dec(p + offset + 12); 834 blk->u.part.offset = be64dec(p + offset + 20); 835 offset = ldm_vnum_get(p, offset + 28, &blk->u.part.size, size); 836 if (offset < 0) { 837 errstr = "partition size"; 838 goto fail; 839 } 840 offset = ldm_vnum_get(p, offset, &blk->u.part.comp_id, size); 841 if (offset < 0) { 842 errstr = "component id"; 843 goto fail; 844 } 845 offset = ldm_vnum_get(p, offset, &blk->u.part.disk_id, size); 846 if (offset < 0) { 847 errstr = "disk id"; 848 goto fail; 849 } 850 break; 851 /* 852 * Disk VBLK fields: 853 * Offset Size Description 854 * ------------+-------+------------------------ 855 * 0x18+ PS disk GUID 856 */ 857 case LDM_VBLK_T_DISK: 858 errstr = "disk guid"; 859 offset = ldm_vstr_get(p, offset, vstr, sizeof(vstr), size); 860 if (offset < 0) 861 goto fail; 862 error = parse_uuid(vstr, &blk->u.disk.guid); 863 if (error != 0) 864 goto fail; 865 LIST_INSERT_HEAD(&db->disks, &blk->u.disk, entry); 866 break; 867 /* 868 * Disk group VBLK fields: 869 * Offset Size Description 870 * ------------+-------+------------------------ 871 * 0x18+ PS disk group GUID 872 */ 873 case LDM_VBLK_T_DISKGROUP: 874 #if 0 875 strncpy(blk->u.disk_group.name, vstr, 876 sizeof(blk->u.disk_group.name)); 877 offset = ldm_vstr_get(p, offset, vstr, sizeof(vstr), size); 878 if (offset < 0) { 879 errstr = "disk group guid"; 880 goto fail; 881 } 882 error = parse_uuid(name, &blk->u.disk_group.guid); 883 if (error != 0) { 884 errstr = "disk group guid"; 885 goto fail; 886 } 887 LIST_INSERT_HEAD(&db->groups, &blk->u.disk_group, entry); 888 #endif 889 break; 890 /* 891 * Disk VBLK fields: 892 * Offset Size Description 893 * ------------+-------+------------------------ 894 * 0x18+ 16 disk GUID 895 */ 896 case LDM_VBLK_T_DISK4: 897 be_uuid_dec(p + offset, &blk->u.disk.guid); 898 LIST_INSERT_HEAD(&db->disks, &blk->u.disk, entry); 899 break; 900 /* 901 * Disk group VBLK fields: 902 * Offset Size Description 903 * ------------+-------+------------------------ 904 * 0x18+ 16 disk GUID 905 */ 906 case LDM_VBLK_T_DISKGROUP4: 907 #if 0 908 strncpy(blk->u.disk_group.name, vstr, 909 sizeof(blk->u.disk_group.name)); 910 be_uuid_dec(p + offset, &blk->u.disk.guid); 911 LIST_INSERT_HEAD(&db->groups, &blk->u.disk_group, entry); 912 #endif 913 break; 914 /* 915 * Volume VBLK fields: 916 * Offset Size Description 917 * ------------+-------+------------------------ 918 * 0x18+ PS volume type 919 * 0x18+ PS unknown 920 * 0x18+ 14(S) volume state 921 * 0x18+16 1 volume number 922 * 0x18+21 PN volume children count 923 * 0x2D+16 PN volume size 924 * 0x3D+4 1 partition type 925 */ 926 case LDM_VBLK_T_VOLUME: 927 offset = ldm_vparm_skip(p, offset, size); 928 if (offset < 0) { 929 errstr = "volume type"; 930 goto fail; 931 } 932 offset = ldm_vparm_skip(p, offset, size); 933 if (offset < 0) { 934 errstr = "unknown param"; 935 goto fail; 936 } 937 if (offset + 21 >= size) { 938 errstr = "too small buffer"; 939 goto fail; 940 } 941 blk->u.vol.number = p[offset + 16]; 942 offset = ldm_vparm_skip(p, offset + 21, size); 943 if (offset < 0) { 944 errstr = "children count"; 945 goto fail; 946 } 947 offset = ldm_vnum_get(p, offset + 16, &blk->u.vol.size, size); 948 if (offset < 0) { 949 errstr = "volume size"; 950 goto fail; 951 } 952 if (offset + 4 >= size) { 953 errstr = "too small buffer"; 954 goto fail; 955 } 956 blk->u.vol.part_type = p[offset + 4]; 957 /* keep volumes ordered by volume number */ 958 last = NULL; 959 LIST_FOREACH(volume, &db->volumes, entry) { 960 if (volume->number > blk->u.vol.number) 961 break; 962 last = volume; 963 } 964 if (last != NULL) 965 LIST_INSERT_AFTER(last, &blk->u.vol, entry); 966 else 967 LIST_INSERT_HEAD(&db->volumes, &blk->u.vol, entry); 968 break; 969 default: 970 LDM_DEBUG(1, "unknown VBLK type 0x%02x\n", blk->type); 971 LDM_DUMP(p, size); 972 } 973 LIST_INSERT_HEAD(&db->vblks, blk, entry); 974 return (0); 975 fail: 976 LDM_DEBUG(0, "failed to parse '%s' in VBLK of type 0x%02x\n", 977 errstr, blk->type); 978 LDM_DUMP(p, size); 979 g_free(blk); 980 return (EINVAL); 981 } 982 983 static void 984 ldm_vmdb_free(struct ldm_db *db) 985 { 986 struct ldm_vblk *vblk; 987 struct ldm_xvblk *xvblk; 988 989 while (!LIST_EMPTY(&db->xvblks)) { 990 xvblk = LIST_FIRST(&db->xvblks); 991 LIST_REMOVE(xvblk, entry); 992 g_free(xvblk->data); 993 g_free(xvblk); 994 } 995 while (!LIST_EMPTY(&db->vblks)) { 996 vblk = LIST_FIRST(&db->vblks); 997 LIST_REMOVE(vblk, entry); 998 g_free(vblk); 999 } 1000 } 1001 1002 static int 1003 ldm_vmdb_parse(struct ldm_db *db, struct g_consumer *cp) 1004 { 1005 struct g_provider *pp; 1006 struct ldm_vblk *vblk; 1007 struct ldm_xvblk *xvblk; 1008 struct ldm_volume *volume; 1009 struct ldm_component *comp; 1010 struct ldm_vblkhdr vh; 1011 u_char *buf, *p; 1012 size_t size, n, sectors; 1013 uint64_t offset; 1014 int error; 1015 1016 pp = cp->provider; 1017 size = (db->dh.last_seq * db->dh.size + 1018 pp->sectorsize - 1) / 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 knowlege 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; 1472 i < sizeof(ldm_alias_match) / sizeof(ldm_alias_match[0]); i++) { 1473 if (ldm_alias_match[i].typ == entry->type) 1474 return (g_part_alias_name(ldm_alias_match[i].alias)); 1475 } 1476 snprintf(buf, bufsz, "!%d", entry->type); 1477 return (buf); 1478 } 1479 1480 static int 1481 g_part_ldm_write(struct g_part_table *basetable, struct g_consumer *cp) 1482 { 1483 1484 return (ENOSYS); 1485 } 1486