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 TUNABLE_INT("kern.geom.part.ldm.debug", &ldm_debug); 59 SYSCTL_UINT(_kern_geom_part_ldm, OID_AUTO, debug, 60 CTLFLAG_RW | CTLFLAG_TUN, &ldm_debug, 0, "Debug level"); 61 62 /* 63 * This allows access to mirrored LDM volumes. Since we do not 64 * doing mirroring here, it is not enabled by default. 65 */ 66 static u_int show_mirrors = 0; 67 TUNABLE_INT("kern.geom.part.ldm.show_mirrors", &show_mirrors); 68 SYSCTL_UINT(_kern_geom_part_ldm, OID_AUTO, show_mirrors, 69 CTLFLAG_RW | CTLFLAG_TUN, &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 static int g_part_ldm_resize(struct g_part_table *, struct g_part_entry *, 343 struct g_part_parms *); 344 345 static kobj_method_t g_part_ldm_methods[] = { 346 KOBJMETHOD(g_part_add, g_part_ldm_add), 347 KOBJMETHOD(g_part_bootcode, g_part_ldm_bootcode), 348 KOBJMETHOD(g_part_create, g_part_ldm_create), 349 KOBJMETHOD(g_part_destroy, g_part_ldm_destroy), 350 KOBJMETHOD(g_part_dumpconf, g_part_ldm_dumpconf), 351 KOBJMETHOD(g_part_dumpto, g_part_ldm_dumpto), 352 KOBJMETHOD(g_part_modify, g_part_ldm_modify), 353 KOBJMETHOD(g_part_resize, g_part_ldm_resize), 354 KOBJMETHOD(g_part_name, g_part_ldm_name), 355 KOBJMETHOD(g_part_probe, g_part_ldm_probe), 356 KOBJMETHOD(g_part_read, g_part_ldm_read), 357 KOBJMETHOD(g_part_type, g_part_ldm_type), 358 KOBJMETHOD(g_part_write, g_part_ldm_write), 359 { 0, 0 } 360 }; 361 362 static struct g_part_scheme g_part_ldm_scheme = { 363 "LDM", 364 g_part_ldm_methods, 365 sizeof(struct g_part_ldm_table), 366 .gps_entrysz = sizeof(struct g_part_ldm_entry) 367 }; 368 G_PART_SCHEME_DECLARE(g_part_ldm); 369 370 static struct g_part_ldm_alias { 371 u_char typ; 372 int alias; 373 } ldm_alias_match[] = { 374 { DOSPTYP_NTFS, G_PART_ALIAS_MS_NTFS }, 375 { DOSPTYP_FAT32, G_PART_ALIAS_MS_FAT32 }, 376 { DOSPTYP_386BSD, G_PART_ALIAS_FREEBSD }, 377 { DOSPTYP_LDM, G_PART_ALIAS_MS_LDM_DATA }, 378 { DOSPTYP_LINSWP, G_PART_ALIAS_LINUX_SWAP }, 379 { DOSPTYP_LINUX, G_PART_ALIAS_LINUX_DATA }, 380 { DOSPTYP_LINLVM, G_PART_ALIAS_LINUX_LVM }, 381 { DOSPTYP_LINRAID, G_PART_ALIAS_LINUX_RAID }, 382 }; 383 384 static u_char* 385 ldm_privhdr_read(struct g_consumer *cp, uint64_t off, int *error) 386 { 387 struct g_provider *pp; 388 u_char *buf; 389 390 pp = cp->provider; 391 buf = g_read_data(cp, off, pp->sectorsize, error); 392 if (buf == NULL) 393 return (NULL); 394 395 if (memcmp(buf, LDM_PH_SIGN, strlen(LDM_PH_SIGN)) != 0) { 396 LDM_DEBUG(1, "%s: invalid LDM private header signature", 397 pp->name); 398 g_free(buf); 399 buf = NULL; 400 *error = EINVAL; 401 } 402 return (buf); 403 } 404 405 static int 406 ldm_privhdr_parse(struct g_consumer *cp, struct ldm_privhdr *hdr, 407 const u_char *buf) 408 { 409 uint32_t version; 410 int error; 411 412 memset(hdr, 0, sizeof(*hdr)); 413 version = be32dec(buf + LDM_PH_VERSION_OFF); 414 if (version != LDM_VERSION_2K && 415 version != LDM_VERSION_VISTA) { 416 LDM_DEBUG(0, "%s: unsupported LDM version %u.%u", 417 cp->provider->name, version >> 16, 418 version & 0xFFFF); 419 return (ENXIO); 420 } 421 error = parse_uuid(buf + LDM_PH_DISKGUID_OFF, &hdr->disk_guid); 422 if (error != 0) 423 return (error); 424 error = parse_uuid(buf + LDM_PH_DGGUID_OFF, &hdr->dg_guid); 425 if (error != 0) 426 return (error); 427 strncpy(hdr->dg_name, buf + LDM_PH_DGNAME_OFF, sizeof(hdr->dg_name)); 428 hdr->start = be64dec(buf + LDM_PH_START_OFF); 429 hdr->size = be64dec(buf + LDM_PH_SIZE_OFF); 430 hdr->db_offset = be64dec(buf + LDM_PH_DB_OFF); 431 hdr->db_size = be64dec(buf + LDM_PH_DBSIZE_OFF); 432 hdr->th_offset[0] = be64dec(buf + LDM_PH_TH1_OFF); 433 hdr->th_offset[1] = be64dec(buf + LDM_PH_TH2_OFF); 434 hdr->conf_size = be64dec(buf + LDM_PH_CONFSIZE_OFF); 435 hdr->log_size = be64dec(buf + LDM_PH_LOGSIZE_OFF); 436 return (0); 437 } 438 439 static int 440 ldm_privhdr_check(struct ldm_db *db, struct g_consumer *cp, int is_gpt) 441 { 442 struct g_consumer *cp2; 443 struct g_provider *pp; 444 struct ldm_privhdr hdr; 445 uint64_t offset, last; 446 int error, found, i; 447 u_char *buf; 448 449 pp = cp->provider; 450 if (is_gpt) { 451 /* 452 * The last LBA is used in several checks below, for the 453 * GPT case it should be calculated relative to the whole 454 * disk. 455 */ 456 cp2 = LIST_FIRST(&pp->geom->consumer); 457 last = 458 cp2->provider->mediasize / cp2->provider->sectorsize - 1; 459 } else 460 last = pp->mediasize / pp->sectorsize - 1; 461 for (found = 0, i = is_gpt; 462 i < sizeof(ldm_ph_off) / sizeof(ldm_ph_off[0]); i++) { 463 offset = ldm_ph_off[i]; 464 /* 465 * In the GPT case consumer is attached to the LDM metadata 466 * partition and we don't need add db_offset. 467 */ 468 if (!is_gpt) 469 offset += db->ph.db_offset; 470 if (i == LDM_PH_MBRINDEX) { 471 /* 472 * Prepare to errors and setup new base offset 473 * to read backup private headers. Assume that LDM 474 * database is in the last 1Mbyte area. 475 */ 476 db->ph.db_offset = last - LDM_DB_SIZE; 477 } 478 buf = ldm_privhdr_read(cp, offset * pp->sectorsize, &error); 479 if (buf == NULL) { 480 LDM_DEBUG(1, "%s: failed to read private header " 481 "%d at LBA %ju", pp->name, i, (uintmax_t)offset); 482 continue; 483 } 484 error = ldm_privhdr_parse(cp, &hdr, buf); 485 if (error != 0) { 486 LDM_DEBUG(1, "%s: failed to parse private " 487 "header %d", pp->name, i); 488 LDM_DUMP(buf, pp->sectorsize); 489 g_free(buf); 490 continue; 491 } 492 g_free(buf); 493 if (hdr.start > last || 494 hdr.start + hdr.size - 1 > last || 495 (hdr.start + hdr.size - 1 > hdr.db_offset && !is_gpt) || 496 hdr.db_size != LDM_DB_SIZE || 497 hdr.db_offset + LDM_DB_SIZE - 1 > last || 498 hdr.th_offset[0] >= LDM_DB_SIZE || 499 hdr.th_offset[1] >= LDM_DB_SIZE || 500 hdr.conf_size + hdr.log_size >= LDM_DB_SIZE) { 501 LDM_DEBUG(1, "%s: invalid values in the " 502 "private header %d", pp->name, i); 503 LDM_DEBUG(2, "%s: start: %jd, size: %jd, " 504 "db_offset: %jd, db_size: %jd, th_offset0: %jd, " 505 "th_offset1: %jd, conf_size: %jd, log_size: %jd, " 506 "last: %jd", pp->name, hdr.start, hdr.size, 507 hdr.db_offset, hdr.db_size, hdr.th_offset[0], 508 hdr.th_offset[1], hdr.conf_size, hdr.log_size, 509 last); 510 continue; 511 } 512 if (found != 0 && memcmp(&db->ph, &hdr, sizeof(hdr)) != 0) { 513 LDM_DEBUG(0, "%s: private headers are not equal", 514 pp->name); 515 if (i > 1) { 516 /* 517 * We have different headers in the LDM. 518 * We can not trust this metadata. 519 */ 520 LDM_DEBUG(0, "%s: refuse LDM metadata", 521 pp->name); 522 return (EINVAL); 523 } 524 /* 525 * We already have read primary private header 526 * and it differs from this backup one. 527 * Prefer the backup header and save it. 528 */ 529 found = 0; 530 } 531 if (found == 0) 532 memcpy(&db->ph, &hdr, sizeof(hdr)); 533 found = 1; 534 } 535 if (found == 0) { 536 LDM_DEBUG(1, "%s: valid LDM private header not found", 537 pp->name); 538 return (ENXIO); 539 } 540 return (0); 541 } 542 543 static int 544 ldm_gpt_check(struct ldm_db *db, struct g_consumer *cp) 545 { 546 struct g_part_table *gpt; 547 struct g_part_entry *e; 548 struct g_consumer *cp2; 549 int error; 550 551 cp2 = LIST_NEXT(cp, consumer); 552 g_topology_lock(); 553 gpt = cp->provider->geom->softc; 554 error = 0; 555 LIST_FOREACH(e, &gpt->gpt_entry, gpe_entry) { 556 if (cp->provider == e->gpe_pp) { 557 /* ms-ldm-metadata partition */ 558 if (e->gpe_start != db->ph.db_offset || 559 e->gpe_end != db->ph.db_offset + LDM_DB_SIZE - 1) 560 error++; 561 } else if (cp2->provider == e->gpe_pp) { 562 /* ms-ldm-data partition */ 563 if (e->gpe_start != db->ph.start || 564 e->gpe_end != db->ph.start + db->ph.size - 1) 565 error++; 566 } 567 if (error != 0) { 568 LDM_DEBUG(0, "%s: GPT partition %d boundaries " 569 "do not match with the LDM metadata", 570 e->gpe_pp->name, e->gpe_index); 571 error = ENXIO; 572 break; 573 } 574 } 575 g_topology_unlock(); 576 return (error); 577 } 578 579 static int 580 ldm_tochdr_check(struct ldm_db *db, struct g_consumer *cp) 581 { 582 struct g_provider *pp; 583 struct ldm_tochdr hdr; 584 uint64_t offset, conf_size, log_size; 585 int error, found, i; 586 u_char *buf; 587 588 pp = cp->provider; 589 for (i = 0, found = 0; i < LDM_TH_COUNT; i++) { 590 offset = db->ph.db_offset + db->ph.th_offset[i]; 591 buf = g_read_data(cp, 592 offset * pp->sectorsize, pp->sectorsize, &error); 593 if (buf == NULL) { 594 LDM_DEBUG(1, "%s: failed to read TOC header " 595 "at LBA %ju", pp->name, (uintmax_t)offset); 596 continue; 597 } 598 if (memcmp(buf, LDM_TH_SIGN, strlen(LDM_TH_SIGN)) != 0 || 599 memcmp(buf + LDM_TH_NAME1_OFF, LDM_TH_NAME1, 600 strlen(LDM_TH_NAME1)) != 0 || 601 memcmp(buf + LDM_TH_NAME2_OFF, LDM_TH_NAME2, 602 strlen(LDM_TH_NAME2)) != 0) { 603 LDM_DEBUG(1, "%s: failed to parse TOC header " 604 "at LBA %ju", pp->name, (uintmax_t)offset); 605 LDM_DUMP(buf, pp->sectorsize); 606 g_free(buf); 607 continue; 608 } 609 hdr.conf_offset = be64dec(buf + LDM_TH_CONF_OFF); 610 hdr.log_offset = be64dec(buf + LDM_TH_LOG_OFF); 611 conf_size = be64dec(buf + LDM_TH_CONFSIZE_OFF); 612 log_size = be64dec(buf + LDM_TH_LOGSIZE_OFF); 613 if (conf_size != db->ph.conf_size || 614 hdr.conf_offset + conf_size >= LDM_DB_SIZE || 615 log_size != db->ph.log_size || 616 hdr.log_offset + log_size >= LDM_DB_SIZE) { 617 LDM_DEBUG(1, "%s: invalid values in the " 618 "TOC header at LBA %ju", pp->name, 619 (uintmax_t)offset); 620 LDM_DUMP(buf, pp->sectorsize); 621 g_free(buf); 622 continue; 623 } 624 g_free(buf); 625 if (found == 0) 626 memcpy(&db->th, &hdr, sizeof(hdr)); 627 found = 1; 628 } 629 if (found == 0) { 630 LDM_DEBUG(0, "%s: valid LDM TOC header not found.", 631 pp->name); 632 return (ENXIO); 633 } 634 return (0); 635 } 636 637 static int 638 ldm_vmdbhdr_check(struct ldm_db *db, struct g_consumer *cp) 639 { 640 struct g_provider *pp; 641 struct uuid dg_guid; 642 uint64_t offset; 643 uint32_t version; 644 int error; 645 u_char *buf; 646 647 pp = cp->provider; 648 offset = db->ph.db_offset + db->th.conf_offset; 649 buf = g_read_data(cp, offset * pp->sectorsize, pp->sectorsize, 650 &error); 651 if (buf == NULL) { 652 LDM_DEBUG(0, "%s: failed to read VMDB header at " 653 "LBA %ju", pp->name, (uintmax_t)offset); 654 return (error); 655 } 656 if (memcmp(buf, LDM_VMDB_SIGN, strlen(LDM_VMDB_SIGN)) != 0) { 657 g_free(buf); 658 LDM_DEBUG(0, "%s: failed to parse VMDB header at " 659 "LBA %ju", pp->name, (uintmax_t)offset); 660 return (ENXIO); 661 } 662 /* Check version. */ 663 version = be32dec(buf + LDM_DB_VERSION_OFF); 664 if (version != 0x4000A) { 665 g_free(buf); 666 LDM_DEBUG(0, "%s: unsupported VMDB version %u.%u", 667 pp->name, version >> 16, version & 0xFFFF); 668 return (ENXIO); 669 } 670 /* 671 * Check VMDB update status: 672 * 1 - in a consistent state; 673 * 2 - in a creation phase; 674 * 3 - in a deletion phase; 675 */ 676 if (be16dec(buf + LDM_DB_STATUS_OFF) != 1) { 677 g_free(buf); 678 LDM_DEBUG(0, "%s: VMDB is not in a consistent state", 679 pp->name); 680 return (ENXIO); 681 } 682 db->dh.last_seq = be32dec(buf + LDM_DB_LASTSEQ_OFF); 683 db->dh.size = be32dec(buf + LDM_DB_SIZE_OFF); 684 error = parse_uuid(buf + LDM_DB_DGGUID_OFF, &dg_guid); 685 /* Compare disk group name and guid from VMDB and private headers */ 686 if (error != 0 || db->dh.size == 0 || 687 pp->sectorsize % db->dh.size != 0 || 688 strncmp(buf + LDM_DB_DGNAME_OFF, db->ph.dg_name, 31) != 0 || 689 memcmp(&dg_guid, &db->ph.dg_guid, sizeof(dg_guid)) != 0 || 690 db->dh.size * db->dh.last_seq > 691 db->ph.conf_size * pp->sectorsize) { 692 LDM_DEBUG(0, "%s: invalid values in the VMDB header", 693 pp->name); 694 LDM_DUMP(buf, pp->sectorsize); 695 g_free(buf); 696 return (EINVAL); 697 } 698 g_free(buf); 699 return (0); 700 } 701 702 static int 703 ldm_xvblk_handle(struct ldm_db *db, struct ldm_vblkhdr *vh, const u_char *p) 704 { 705 struct ldm_xvblk *blk; 706 size_t size; 707 708 size = db->dh.size - 16; 709 LIST_FOREACH(blk, &db->xvblks, entry) 710 if (blk->group == vh->group) 711 break; 712 if (blk == NULL) { 713 blk = g_malloc(sizeof(*blk), M_WAITOK | M_ZERO); 714 blk->group = vh->group; 715 blk->size = size * vh->count + 16; 716 blk->data = g_malloc(blk->size, M_WAITOK | M_ZERO); 717 blk->map = 0xFF << vh->count; 718 LIST_INSERT_HEAD(&db->xvblks, blk, entry); 719 } 720 if ((blk->map & (1 << vh->index)) != 0) { 721 /* Block with given index has been already saved. */ 722 return (EINVAL); 723 } 724 /* Copy the data block to the place related to index. */ 725 memcpy(blk->data + size * vh->index + 16, p + 16, size); 726 blk->map |= 1 << vh->index; 727 return (0); 728 } 729 730 /* Read the variable-width numeric field and return new offset */ 731 static int 732 ldm_vnum_get(const u_char *buf, int offset, uint64_t *result, size_t range) 733 { 734 uint64_t num; 735 uint8_t len; 736 737 len = buf[offset++]; 738 if (len > sizeof(uint64_t) || len + offset >= range) 739 return (-1); 740 for (num = 0; len > 0; len--) 741 num = (num << 8) | buf[offset++]; 742 *result = num; 743 return (offset); 744 } 745 746 /* Read the variable-width string and return new offset */ 747 static int 748 ldm_vstr_get(const u_char *buf, int offset, u_char *result, 749 size_t maxlen, size_t range) 750 { 751 uint8_t len; 752 753 len = buf[offset++]; 754 if (len >= maxlen || len + offset >= range) 755 return (-1); 756 memcpy(result, buf + offset, len); 757 result[len] = '\0'; 758 return (offset + len); 759 } 760 761 /* Just skip the variable-width variable and return new offset */ 762 static int 763 ldm_vparm_skip(const u_char *buf, int offset, size_t range) 764 { 765 uint8_t len; 766 767 len = buf[offset++]; 768 if (offset + len >= range) 769 return (-1); 770 771 return (offset + len); 772 } 773 774 static int 775 ldm_vblk_handle(struct ldm_db *db, const u_char *p, size_t size) 776 { 777 struct ldm_vblk *blk; 778 struct ldm_volume *volume, *last; 779 const char *errstr; 780 u_char vstr[64]; 781 int error, offset; 782 783 blk = g_malloc(sizeof(*blk), M_WAITOK | M_ZERO); 784 blk->type = p[LDM_VBLK_TYPE_OFF]; 785 offset = ldm_vnum_get(p, LDM_VBLK_OID_OFF, &blk->u.id, size); 786 if (offset < 0) { 787 errstr = "object id"; 788 goto fail; 789 } 790 offset = ldm_vstr_get(p, offset, vstr, sizeof(vstr), size); 791 if (offset < 0) { 792 errstr = "object name"; 793 goto fail; 794 } 795 switch (blk->type) { 796 /* 797 * Component VBLK fields: 798 * Offset Size Description 799 * ------------+-------+------------------------ 800 * 0x18+ PS volume state 801 * 0x18+5 PN component children count 802 * 0x1D+16 PN parent's volume object id 803 * 0x2D+1 PN stripe size 804 */ 805 case LDM_VBLK_T_COMPONENT: 806 offset = ldm_vparm_skip(p, offset, size); 807 if (offset < 0) { 808 errstr = "volume state"; 809 goto fail; 810 } 811 offset = ldm_vparm_skip(p, offset + 5, size); 812 if (offset < 0) { 813 errstr = "children count"; 814 goto fail; 815 } 816 offset = ldm_vnum_get(p, offset + 16, 817 &blk->u.comp.vol_id, size); 818 if (offset < 0) { 819 errstr = "volume id"; 820 goto fail; 821 } 822 break; 823 /* 824 * Partition VBLK fields: 825 * Offset Size Description 826 * ------------+-------+------------------------ 827 * 0x18+12 8 partition start offset 828 * 0x18+20 8 volume offset 829 * 0x18+28 PN partition size 830 * 0x34+ PN parent's component object id 831 * 0x34+ PN disk's object id 832 */ 833 case LDM_VBLK_T_PARTITION: 834 if (offset + 28 >= size) { 835 errstr = "too small buffer"; 836 goto fail; 837 } 838 blk->u.part.start = be64dec(p + offset + 12); 839 blk->u.part.offset = be64dec(p + offset + 20); 840 offset = ldm_vnum_get(p, offset + 28, &blk->u.part.size, size); 841 if (offset < 0) { 842 errstr = "partition size"; 843 goto fail; 844 } 845 offset = ldm_vnum_get(p, offset, &blk->u.part.comp_id, size); 846 if (offset < 0) { 847 errstr = "component id"; 848 goto fail; 849 } 850 offset = ldm_vnum_get(p, offset, &blk->u.part.disk_id, size); 851 if (offset < 0) { 852 errstr = "disk id"; 853 goto fail; 854 } 855 break; 856 /* 857 * Disk VBLK fields: 858 * Offset Size Description 859 * ------------+-------+------------------------ 860 * 0x18+ PS disk GUID 861 */ 862 case LDM_VBLK_T_DISK: 863 errstr = "disk guid"; 864 offset = ldm_vstr_get(p, offset, vstr, sizeof(vstr), size); 865 if (offset < 0) 866 goto fail; 867 error = parse_uuid(vstr, &blk->u.disk.guid); 868 if (error != 0) 869 goto fail; 870 LIST_INSERT_HEAD(&db->disks, &blk->u.disk, entry); 871 break; 872 /* 873 * Disk group VBLK fields: 874 * Offset Size Description 875 * ------------+-------+------------------------ 876 * 0x18+ PS disk group GUID 877 */ 878 case LDM_VBLK_T_DISKGROUP: 879 #if 0 880 strncpy(blk->u.disk_group.name, vstr, 881 sizeof(blk->u.disk_group.name)); 882 offset = ldm_vstr_get(p, offset, vstr, sizeof(vstr), size); 883 if (offset < 0) { 884 errstr = "disk group guid"; 885 goto fail; 886 } 887 error = parse_uuid(name, &blk->u.disk_group.guid); 888 if (error != 0) { 889 errstr = "disk group guid"; 890 goto fail; 891 } 892 LIST_INSERT_HEAD(&db->groups, &blk->u.disk_group, entry); 893 #endif 894 break; 895 /* 896 * Disk VBLK fields: 897 * Offset Size Description 898 * ------------+-------+------------------------ 899 * 0x18+ 16 disk GUID 900 */ 901 case LDM_VBLK_T_DISK4: 902 be_uuid_dec(p + offset, &blk->u.disk.guid); 903 LIST_INSERT_HEAD(&db->disks, &blk->u.disk, entry); 904 break; 905 /* 906 * Disk group VBLK fields: 907 * Offset Size Description 908 * ------------+-------+------------------------ 909 * 0x18+ 16 disk GUID 910 */ 911 case LDM_VBLK_T_DISKGROUP4: 912 #if 0 913 strncpy(blk->u.disk_group.name, vstr, 914 sizeof(blk->u.disk_group.name)); 915 be_uuid_dec(p + offset, &blk->u.disk.guid); 916 LIST_INSERT_HEAD(&db->groups, &blk->u.disk_group, entry); 917 #endif 918 break; 919 /* 920 * Volume VBLK fields: 921 * Offset Size Description 922 * ------------+-------+------------------------ 923 * 0x18+ PS volume type 924 * 0x18+ PS unknown 925 * 0x18+ 14(S) volume state 926 * 0x18+16 1 volume number 927 * 0x18+21 PN volume children count 928 * 0x2D+16 PN volume size 929 * 0x3D+4 1 partition type 930 */ 931 case LDM_VBLK_T_VOLUME: 932 offset = ldm_vparm_skip(p, offset, size); 933 if (offset < 0) { 934 errstr = "volume type"; 935 goto fail; 936 } 937 offset = ldm_vparm_skip(p, offset, size); 938 if (offset < 0) { 939 errstr = "unknown param"; 940 goto fail; 941 } 942 if (offset + 21 >= size) { 943 errstr = "too small buffer"; 944 goto fail; 945 } 946 blk->u.vol.number = p[offset + 16]; 947 offset = ldm_vparm_skip(p, offset + 21, size); 948 if (offset < 0) { 949 errstr = "children count"; 950 goto fail; 951 } 952 offset = ldm_vnum_get(p, offset + 16, &blk->u.vol.size, size); 953 if (offset < 0) { 954 errstr = "volume size"; 955 goto fail; 956 } 957 if (offset + 4 >= size) { 958 errstr = "too small buffer"; 959 goto fail; 960 } 961 blk->u.vol.part_type = p[offset + 4]; 962 /* keep volumes ordered by volume number */ 963 last = NULL; 964 LIST_FOREACH(volume, &db->volumes, entry) { 965 if (volume->number > blk->u.vol.number) 966 break; 967 last = volume; 968 } 969 if (last != NULL) 970 LIST_INSERT_AFTER(last, &blk->u.vol, entry); 971 else 972 LIST_INSERT_HEAD(&db->volumes, &blk->u.vol, entry); 973 break; 974 default: 975 LDM_DEBUG(1, "unknown VBLK type 0x%02x\n", blk->type); 976 LDM_DUMP(p, size); 977 } 978 LIST_INSERT_HEAD(&db->vblks, blk, entry); 979 return (0); 980 fail: 981 LDM_DEBUG(0, "failed to parse '%s' in VBLK of type 0x%02x\n", 982 errstr, blk->type); 983 LDM_DUMP(p, size); 984 g_free(blk); 985 return (EINVAL); 986 } 987 988 static void 989 ldm_vmdb_free(struct ldm_db *db) 990 { 991 struct ldm_vblk *vblk; 992 struct ldm_xvblk *xvblk; 993 994 while (!LIST_EMPTY(&db->xvblks)) { 995 xvblk = LIST_FIRST(&db->xvblks); 996 LIST_REMOVE(xvblk, entry); 997 g_free(xvblk->data); 998 g_free(xvblk); 999 } 1000 while (!LIST_EMPTY(&db->vblks)) { 1001 vblk = LIST_FIRST(&db->vblks); 1002 LIST_REMOVE(vblk, entry); 1003 g_free(vblk); 1004 } 1005 } 1006 1007 static int 1008 ldm_vmdb_parse(struct ldm_db *db, struct g_consumer *cp) 1009 { 1010 struct g_provider *pp; 1011 struct ldm_vblk *vblk; 1012 struct ldm_xvblk *xvblk; 1013 struct ldm_volume *volume; 1014 struct ldm_component *comp; 1015 struct ldm_vblkhdr vh; 1016 u_char *buf, *p; 1017 size_t size, n, sectors; 1018 uint64_t offset; 1019 int error; 1020 1021 pp = cp->provider; 1022 size = (db->dh.last_seq * db->dh.size + 1023 pp->sectorsize - 1) / pp->sectorsize; 1024 size -= 1; /* one sector takes vmdb header */ 1025 for (n = 0; n < size; n += MAXPHYS / pp->sectorsize) { 1026 offset = db->ph.db_offset + db->th.conf_offset + n + 1; 1027 sectors = (size - n) > (MAXPHYS / pp->sectorsize) ? 1028 MAXPHYS / pp->sectorsize: size - n; 1029 /* read VBLKs */ 1030 buf = g_read_data(cp, offset * pp->sectorsize, 1031 sectors * pp->sectorsize, &error); 1032 if (buf == NULL) { 1033 LDM_DEBUG(0, "%s: failed to read VBLK\n", 1034 pp->name); 1035 goto fail; 1036 } 1037 for (p = buf; p < buf + sectors * pp->sectorsize; 1038 p += db->dh.size) { 1039 if (memcmp(p, LDM_VBLK_SIGN, 1040 strlen(LDM_VBLK_SIGN)) != 0) { 1041 LDM_DEBUG(0, "%s: no VBLK signature\n", 1042 pp->name); 1043 LDM_DUMP(p, db->dh.size); 1044 goto fail; 1045 } 1046 vh.seq = be32dec(p + LDM_VBLK_SEQ_OFF); 1047 vh.group = be32dec(p + LDM_VBLK_GROUP_OFF); 1048 /* skip empty blocks */ 1049 if (vh.seq == 0 || vh.group == 0) 1050 continue; 1051 vh.index = be16dec(p + LDM_VBLK_INDEX_OFF); 1052 vh.count = be16dec(p + LDM_VBLK_COUNT_OFF); 1053 if (vh.count == 0 || vh.count > 4 || 1054 vh.seq > db->dh.last_seq) { 1055 LDM_DEBUG(0, "%s: invalid values " 1056 "in the VBLK header\n", pp->name); 1057 LDM_DUMP(p, db->dh.size); 1058 goto fail; 1059 } 1060 if (vh.count > 1) { 1061 error = ldm_xvblk_handle(db, &vh, p); 1062 if (error != 0) { 1063 LDM_DEBUG(0, "%s: xVBLK " 1064 "is corrupted\n", pp->name); 1065 LDM_DUMP(p, db->dh.size); 1066 goto fail; 1067 } 1068 continue; 1069 } 1070 if (be16dec(p + 16) != 0) 1071 LDM_DEBUG(1, "%s: VBLK update" 1072 " status is %u\n", pp->name, 1073 be16dec(p + 16)); 1074 error = ldm_vblk_handle(db, p, db->dh.size); 1075 if (error != 0) 1076 goto fail; 1077 } 1078 g_free(buf); 1079 buf = NULL; 1080 } 1081 /* Parse xVBLKs */ 1082 while (!LIST_EMPTY(&db->xvblks)) { 1083 xvblk = LIST_FIRST(&db->xvblks); 1084 if (xvblk->map == 0xFF) { 1085 error = ldm_vblk_handle(db, xvblk->data, xvblk->size); 1086 if (error != 0) 1087 goto fail; 1088 } else { 1089 LDM_DEBUG(0, "%s: incomplete or corrupt " 1090 "xVBLK found\n", pp->name); 1091 goto fail; 1092 } 1093 LIST_REMOVE(xvblk, entry); 1094 g_free(xvblk->data); 1095 g_free(xvblk); 1096 } 1097 /* construct all VBLKs relations */ 1098 LIST_FOREACH(volume, &db->volumes, entry) { 1099 LIST_FOREACH(vblk, &db->vblks, entry) 1100 if (vblk->type == LDM_VBLK_T_COMPONENT && 1101 vblk->u.comp.vol_id == volume->id) { 1102 LIST_INSERT_HEAD(&volume->components, 1103 &vblk->u.comp, entry); 1104 volume->count++; 1105 } 1106 LIST_FOREACH(comp, &volume->components, entry) 1107 LIST_FOREACH(vblk, &db->vblks, entry) 1108 if (vblk->type == LDM_VBLK_T_PARTITION && 1109 vblk->u.part.comp_id == comp->id) { 1110 LIST_INSERT_HEAD(&comp->partitions, 1111 &vblk->u.part, entry); 1112 comp->count++; 1113 } 1114 } 1115 return (0); 1116 fail: 1117 ldm_vmdb_free(db); 1118 g_free(buf); 1119 return (ENXIO); 1120 } 1121 1122 static int 1123 g_part_ldm_add(struct g_part_table *basetable, struct g_part_entry *baseentry, 1124 struct g_part_parms *gpp) 1125 { 1126 1127 return (ENOSYS); 1128 } 1129 1130 static int 1131 g_part_ldm_bootcode(struct g_part_table *basetable, struct g_part_parms *gpp) 1132 { 1133 1134 return (ENOSYS); 1135 } 1136 1137 static int 1138 g_part_ldm_create(struct g_part_table *basetable, struct g_part_parms *gpp) 1139 { 1140 1141 return (ENOSYS); 1142 } 1143 1144 static int 1145 g_part_ldm_destroy(struct g_part_table *basetable, struct g_part_parms *gpp) 1146 { 1147 struct g_part_ldm_table *table; 1148 struct g_provider *pp; 1149 1150 table = (struct g_part_ldm_table *)basetable; 1151 /* 1152 * To destroy LDM on a disk partitioned with GPT we should delete 1153 * ms-ldm-metadata partition, but we can't do this via standard 1154 * GEOM_PART method. 1155 */ 1156 if (table->is_gpt) 1157 return (ENOSYS); 1158 pp = LIST_FIRST(&basetable->gpt_gp->consumer)->provider; 1159 /* 1160 * To destroy LDM we should wipe MBR, first private header and 1161 * backup private headers. 1162 */ 1163 basetable->gpt_smhead = (1 << ldm_ph_off[0]) | 1; 1164 /* 1165 * Don't touch last backup private header when LDM database is 1166 * not located in the last 1MByte area. 1167 * XXX: can't remove all blocks. 1168 */ 1169 if (table->db_offset + LDM_DB_SIZE == 1170 pp->mediasize / pp->sectorsize) 1171 basetable->gpt_smtail = 1; 1172 return (0); 1173 } 1174 1175 static void 1176 g_part_ldm_dumpconf(struct g_part_table *basetable, 1177 struct g_part_entry *baseentry, struct sbuf *sb, const char *indent) 1178 { 1179 struct g_part_ldm_entry *entry; 1180 1181 entry = (struct g_part_ldm_entry *)baseentry; 1182 if (indent == NULL) { 1183 /* conftxt: libdisk compatibility */ 1184 sbuf_printf(sb, " xs LDM xt %u", entry->type); 1185 } else if (entry != NULL) { 1186 /* confxml: partition entry information */ 1187 sbuf_printf(sb, "%s<rawtype>%u</rawtype>\n", indent, 1188 entry->type); 1189 } else { 1190 /* confxml: scheme information */ 1191 } 1192 } 1193 1194 static int 1195 g_part_ldm_dumpto(struct g_part_table *table, struct g_part_entry *baseentry) 1196 { 1197 1198 return (0); 1199 } 1200 1201 static int 1202 g_part_ldm_modify(struct g_part_table *basetable, 1203 struct g_part_entry *baseentry, struct g_part_parms *gpp) 1204 { 1205 1206 return (ENOSYS); 1207 } 1208 1209 static int 1210 g_part_ldm_resize(struct g_part_table *basetable, 1211 struct g_part_entry *baseentry, struct g_part_parms *gpp) 1212 { 1213 1214 return (ENOSYS); 1215 } 1216 1217 static const char * 1218 g_part_ldm_name(struct g_part_table *table, struct g_part_entry *baseentry, 1219 char *buf, size_t bufsz) 1220 { 1221 1222 snprintf(buf, bufsz, "s%d", baseentry->gpe_index); 1223 return (buf); 1224 } 1225 1226 static int 1227 ldm_gpt_probe(struct g_part_table *basetable, struct g_consumer *cp) 1228 { 1229 struct g_part_ldm_table *table; 1230 struct g_part_table *gpt; 1231 struct g_part_entry *entry; 1232 struct g_consumer *cp2; 1233 struct gpt_ent *part; 1234 u_char *buf; 1235 int error; 1236 1237 /* 1238 * XXX: We use some knowlege about GEOM_PART_GPT internal 1239 * structures, but it is easier than parse GPT by himself. 1240 */ 1241 g_topology_lock(); 1242 gpt = cp->provider->geom->softc; 1243 LIST_FOREACH(entry, &gpt->gpt_entry, gpe_entry) { 1244 part = (struct gpt_ent *)(entry + 1); 1245 /* Search ms-ldm-metadata partition */ 1246 if (memcmp(&part->ent_type, 1247 &gpt_uuid_ms_ldm_metadata, sizeof(struct uuid)) != 0 || 1248 entry->gpe_end - entry->gpe_start < LDM_DB_SIZE - 1) 1249 continue; 1250 1251 /* Create new consumer and attach it to metadata partition */ 1252 cp2 = g_new_consumer(cp->geom); 1253 error = g_attach(cp2, entry->gpe_pp); 1254 if (error != 0) { 1255 g_destroy_consumer(cp2); 1256 g_topology_unlock(); 1257 return (ENXIO); 1258 } 1259 error = g_access(cp2, 1, 0, 0); 1260 if (error != 0) { 1261 g_detach(cp2); 1262 g_destroy_consumer(cp2); 1263 g_topology_unlock(); 1264 return (ENXIO); 1265 } 1266 g_topology_unlock(); 1267 1268 LDM_DEBUG(2, "%s: LDM metadata partition %s found in the GPT", 1269 cp->provider->name, cp2->provider->name); 1270 /* Read the LDM private header */ 1271 buf = ldm_privhdr_read(cp2, 1272 ldm_ph_off[LDM_PH_GPTINDEX] * cp2->provider->sectorsize, 1273 &error); 1274 if (buf != NULL) { 1275 table = (struct g_part_ldm_table *)basetable; 1276 table->is_gpt = 1; 1277 g_free(buf); 1278 return (G_PART_PROBE_PRI_HIGH); 1279 } 1280 1281 /* second consumer is no longer needed. */ 1282 g_topology_lock(); 1283 g_access(cp2, -1, 0, 0); 1284 g_detach(cp2); 1285 g_destroy_consumer(cp2); 1286 break; 1287 } 1288 g_topology_unlock(); 1289 return (ENXIO); 1290 } 1291 1292 static int 1293 g_part_ldm_probe(struct g_part_table *basetable, struct g_consumer *cp) 1294 { 1295 struct g_provider *pp; 1296 u_char *buf, type[64]; 1297 int error, idx; 1298 1299 1300 pp = cp->provider; 1301 if (pp->sectorsize != 512) 1302 return (ENXIO); 1303 1304 error = g_getattr("PART::scheme", cp, &type); 1305 if (error == 0 && strcmp(type, "GPT") == 0) { 1306 if (g_getattr("PART::type", cp, &type) != 0 || 1307 strcmp(type, "ms-ldm-data") != 0) 1308 return (ENXIO); 1309 error = ldm_gpt_probe(basetable, cp); 1310 return (error); 1311 } 1312 1313 if (basetable->gpt_depth != 0) 1314 return (ENXIO); 1315 1316 /* LDM has 1M metadata area */ 1317 if (pp->mediasize <= 1024 * 1024) 1318 return (ENOSPC); 1319 1320 /* Check that there's a MBR */ 1321 buf = g_read_data(cp, 0, pp->sectorsize, &error); 1322 if (buf == NULL) 1323 return (error); 1324 1325 if (le16dec(buf + DOSMAGICOFFSET) != DOSMAGIC) { 1326 g_free(buf); 1327 return (ENXIO); 1328 } 1329 error = ENXIO; 1330 /* Check that we have LDM partitions in the MBR */ 1331 for (idx = 0; idx < NDOSPART && error != 0; idx++) { 1332 if (buf[DOSPARTOFF + idx * DOSPARTSIZE + 4] == DOSPTYP_LDM) 1333 error = 0; 1334 } 1335 g_free(buf); 1336 if (error == 0) { 1337 LDM_DEBUG(2, "%s: LDM data partitions found in MBR", 1338 pp->name); 1339 /* Read the LDM private header */ 1340 buf = ldm_privhdr_read(cp, 1341 ldm_ph_off[LDM_PH_MBRINDEX] * pp->sectorsize, &error); 1342 if (buf == NULL) 1343 return (error); 1344 g_free(buf); 1345 return (G_PART_PROBE_PRI_HIGH); 1346 } 1347 return (error); 1348 } 1349 1350 static int 1351 g_part_ldm_read(struct g_part_table *basetable, struct g_consumer *cp) 1352 { 1353 struct g_part_ldm_table *table; 1354 struct g_part_ldm_entry *entry; 1355 struct g_consumer *cp2; 1356 struct ldm_component *comp; 1357 struct ldm_partition *part; 1358 struct ldm_volume *vol; 1359 struct ldm_disk *disk; 1360 struct ldm_db db; 1361 int error, index, skipped; 1362 1363 table = (struct g_part_ldm_table *)basetable; 1364 memset(&db, 0, sizeof(db)); 1365 cp2 = cp; /* ms-ldm-data */ 1366 if (table->is_gpt) 1367 cp = LIST_FIRST(&cp->geom->consumer); /* ms-ldm-metadata */ 1368 /* Read and parse LDM private headers. */ 1369 error = ldm_privhdr_check(&db, cp, table->is_gpt); 1370 if (error != 0) 1371 goto gpt_cleanup; 1372 basetable->gpt_first = table->is_gpt ? 0: db.ph.start; 1373 basetable->gpt_last = basetable->gpt_first + db.ph.size - 1; 1374 table->db_offset = db.ph.db_offset; 1375 /* Make additional checks for GPT */ 1376 if (table->is_gpt) { 1377 error = ldm_gpt_check(&db, cp); 1378 if (error != 0) 1379 goto gpt_cleanup; 1380 /* 1381 * Now we should reset database offset to zero, because our 1382 * consumer cp is attached to the ms-ldm-metadata partition 1383 * and we don't need add db_offset to read from it. 1384 */ 1385 db.ph.db_offset = 0; 1386 } 1387 /* Read and parse LDM TOC headers. */ 1388 error = ldm_tochdr_check(&db, cp); 1389 if (error != 0) 1390 goto gpt_cleanup; 1391 /* Read and parse LDM VMDB header. */ 1392 error = ldm_vmdbhdr_check(&db, cp); 1393 if (error != 0) 1394 goto gpt_cleanup; 1395 error = ldm_vmdb_parse(&db, cp); 1396 /* 1397 * For the GPT case we must detach and destroy 1398 * second consumer before return. 1399 */ 1400 gpt_cleanup: 1401 if (table->is_gpt) { 1402 g_topology_lock(); 1403 g_access(cp, -1, 0, 0); 1404 g_detach(cp); 1405 g_destroy_consumer(cp); 1406 g_topology_unlock(); 1407 cp = cp2; 1408 } 1409 if (error != 0) 1410 return (error); 1411 /* Search current disk in the disk list. */ 1412 LIST_FOREACH(disk, &db.disks, entry) 1413 if (memcmp(&disk->guid, &db.ph.disk_guid, 1414 sizeof(struct uuid)) == 0) 1415 break; 1416 if (disk == NULL) { 1417 LDM_DEBUG(1, "%s: no LDM volumes on this disk", 1418 cp->provider->name); 1419 ldm_vmdb_free(&db); 1420 return (ENXIO); 1421 } 1422 index = 1; 1423 LIST_FOREACH(vol, &db.volumes, entry) { 1424 LIST_FOREACH(comp, &vol->components, entry) { 1425 /* Skip volumes from different disks. */ 1426 part = LIST_FIRST(&comp->partitions); 1427 if (part->disk_id != disk->id) 1428 continue; 1429 skipped = 0; 1430 /* We don't support spanned and striped volumes. */ 1431 if (comp->count > 1 || part->offset != 0) { 1432 LDM_DEBUG(1, "%s: LDM volume component " 1433 "%ju has %u partitions. Skipped", 1434 cp->provider->name, (uintmax_t)comp->id, 1435 comp->count); 1436 skipped = 1; 1437 } 1438 /* 1439 * Allow mirrored volumes only when they are explicitly 1440 * allowed with kern.geom.part.ldm.show_mirrors=1. 1441 */ 1442 if (vol->count > 1 && show_mirrors == 0) { 1443 LDM_DEBUG(1, "%s: LDM volume %ju has %u " 1444 "components. Skipped", 1445 cp->provider->name, (uintmax_t)vol->id, 1446 vol->count); 1447 skipped = 1; 1448 } 1449 entry = (struct g_part_ldm_entry *)g_part_new_entry( 1450 basetable, index++, 1451 basetable->gpt_first + part->start, 1452 basetable->gpt_first + part->start + 1453 part->size - 1); 1454 /* 1455 * Mark skipped partition as ms-ldm-data partition. 1456 * We do not support them, but it is better to show 1457 * that we have something there, than just show 1458 * free space. 1459 */ 1460 if (skipped == 0) 1461 entry->type = vol->part_type; 1462 else 1463 entry->type = DOSPTYP_LDM; 1464 LDM_DEBUG(1, "%s: new volume id: %ju, start: %ju," 1465 " end: %ju, type: 0x%02x\n", cp->provider->name, 1466 (uintmax_t)part->id,(uintmax_t)part->start + 1467 basetable->gpt_first, (uintmax_t)part->start + 1468 part->size + basetable->gpt_first - 1, 1469 vol->part_type); 1470 } 1471 } 1472 ldm_vmdb_free(&db); 1473 return (error); 1474 } 1475 1476 static const char * 1477 g_part_ldm_type(struct g_part_table *basetable, struct g_part_entry *baseentry, 1478 char *buf, size_t bufsz) 1479 { 1480 struct g_part_ldm_entry *entry; 1481 int i; 1482 1483 entry = (struct g_part_ldm_entry *)baseentry; 1484 for (i = 0; 1485 i < sizeof(ldm_alias_match) / sizeof(ldm_alias_match[0]); i++) { 1486 if (ldm_alias_match[i].typ == entry->type) 1487 return (g_part_alias_name(ldm_alias_match[i].alias)); 1488 } 1489 snprintf(buf, bufsz, "!%d", entry->type); 1490 return (buf); 1491 } 1492 1493 static int 1494 g_part_ldm_write(struct g_part_table *basetable, struct g_consumer *cp) 1495 { 1496 1497 return (ENOSYS); 1498 } 1499