vdev.c revision 193163
1/* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22/* 23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27#include <sys/zfs_context.h> 28#include <sys/fm/fs/zfs.h> 29#include <sys/spa.h> 30#include <sys/spa_impl.h> 31#include <sys/dmu.h> 32#include <sys/dmu_tx.h> 33#include <sys/vdev_impl.h> 34#include <sys/uberblock_impl.h> 35#include <sys/metaslab.h> 36#include <sys/metaslab_impl.h> 37#include <sys/space_map.h> 38#include <sys/zio.h> 39#include <sys/zap.h> 40#include <sys/fs/zfs.h> 41#include <sys/arc.h> 42 43SYSCTL_DECL(_vfs_zfs); 44SYSCTL_NODE(_vfs_zfs, OID_AUTO, vdev, CTLFLAG_RW, 0, "ZFS VDEV"); 45 46/* 47 * Virtual device management. 48 */ 49 50static vdev_ops_t *vdev_ops_table[] = { 51 &vdev_root_ops, 52 &vdev_raidz_ops, 53 &vdev_mirror_ops, 54 &vdev_replacing_ops, 55 &vdev_spare_ops, 56#ifdef _KERNEL 57 &vdev_geom_ops, 58#else 59 &vdev_disk_ops, 60#endif 61 &vdev_file_ops, 62 &vdev_missing_ops, 63 NULL 64}; 65 66/* maximum scrub/resilver I/O queue per leaf vdev */ 67int zfs_scrub_limit = 10; 68 69TUNABLE_INT("vfs.zfs.scrub_limit", &zfs_scrub_limit); 70SYSCTL_INT(_vfs_zfs, OID_AUTO, scrub_limit, CTLFLAG_RDTUN, &zfs_scrub_limit, 0, 71 "Maximum scrub/resilver I/O queue"); 72 73/* 74 * Given a vdev type, return the appropriate ops vector. 75 */ 76static vdev_ops_t * 77vdev_getops(const char *type) 78{ 79 vdev_ops_t *ops, **opspp; 80 81 for (opspp = vdev_ops_table; (ops = *opspp) != NULL; opspp++) 82 if (strcmp(ops->vdev_op_type, type) == 0) 83 break; 84 85 return (ops); 86} 87 88/* 89 * Default asize function: return the MAX of psize with the asize of 90 * all children. This is what's used by anything other than RAID-Z. 91 */ 92uint64_t 93vdev_default_asize(vdev_t *vd, uint64_t psize) 94{ 95 uint64_t asize = P2ROUNDUP(psize, 1ULL << vd->vdev_top->vdev_ashift); 96 uint64_t csize; 97 uint64_t c; 98 99 for (c = 0; c < vd->vdev_children; c++) { 100 csize = vdev_psize_to_asize(vd->vdev_child[c], psize); 101 asize = MAX(asize, csize); 102 } 103 104 return (asize); 105} 106 107/* 108 * Get the replaceable or attachable device size. 109 * If the parent is a mirror or raidz, the replaceable size is the minimum 110 * psize of all its children. For the rest, just return our own psize. 111 * 112 * e.g. 113 * psize rsize 114 * root - - 115 * mirror/raidz - - 116 * disk1 20g 20g 117 * disk2 40g 20g 118 * disk3 80g 80g 119 */ 120uint64_t 121vdev_get_rsize(vdev_t *vd) 122{ 123 vdev_t *pvd, *cvd; 124 uint64_t c, rsize; 125 126 pvd = vd->vdev_parent; 127 128 /* 129 * If our parent is NULL or the root, just return our own psize. 130 */ 131 if (pvd == NULL || pvd->vdev_parent == NULL) 132 return (vd->vdev_psize); 133 134 rsize = 0; 135 136 for (c = 0; c < pvd->vdev_children; c++) { 137 cvd = pvd->vdev_child[c]; 138 rsize = MIN(rsize - 1, cvd->vdev_psize - 1) + 1; 139 } 140 141 return (rsize); 142} 143 144vdev_t * 145vdev_lookup_top(spa_t *spa, uint64_t vdev) 146{ 147 vdev_t *rvd = spa->spa_root_vdev; 148 149 ASSERT(spa_config_held(spa, SCL_ALL, RW_READER) != 0); 150 151 if (vdev < rvd->vdev_children) { 152 ASSERT(rvd->vdev_child[vdev] != NULL); 153 return (rvd->vdev_child[vdev]); 154 } 155 156 return (NULL); 157} 158 159vdev_t * 160vdev_lookup_by_guid(vdev_t *vd, uint64_t guid) 161{ 162 int c; 163 vdev_t *mvd; 164 165 if (vd->vdev_guid == guid) 166 return (vd); 167 168 for (c = 0; c < vd->vdev_children; c++) 169 if ((mvd = vdev_lookup_by_guid(vd->vdev_child[c], guid)) != 170 NULL) 171 return (mvd); 172 173 return (NULL); 174} 175 176void 177vdev_add_child(vdev_t *pvd, vdev_t *cvd) 178{ 179 size_t oldsize, newsize; 180 uint64_t id = cvd->vdev_id; 181 vdev_t **newchild; 182 183 ASSERT(spa_config_held(cvd->vdev_spa, SCL_ALL, RW_WRITER) == SCL_ALL); 184 ASSERT(cvd->vdev_parent == NULL); 185 186 cvd->vdev_parent = pvd; 187 188 if (pvd == NULL) 189 return; 190 191 ASSERT(id >= pvd->vdev_children || pvd->vdev_child[id] == NULL); 192 193 oldsize = pvd->vdev_children * sizeof (vdev_t *); 194 pvd->vdev_children = MAX(pvd->vdev_children, id + 1); 195 newsize = pvd->vdev_children * sizeof (vdev_t *); 196 197 newchild = kmem_zalloc(newsize, KM_SLEEP); 198 if (pvd->vdev_child != NULL) { 199 bcopy(pvd->vdev_child, newchild, oldsize); 200 kmem_free(pvd->vdev_child, oldsize); 201 } 202 203 pvd->vdev_child = newchild; 204 pvd->vdev_child[id] = cvd; 205 206 cvd->vdev_top = (pvd->vdev_top ? pvd->vdev_top: cvd); 207 ASSERT(cvd->vdev_top->vdev_parent->vdev_parent == NULL); 208 209 /* 210 * Walk up all ancestors to update guid sum. 211 */ 212 for (; pvd != NULL; pvd = pvd->vdev_parent) 213 pvd->vdev_guid_sum += cvd->vdev_guid_sum; 214 215 if (cvd->vdev_ops->vdev_op_leaf) 216 cvd->vdev_spa->spa_scrub_maxinflight += zfs_scrub_limit; 217} 218 219void 220vdev_remove_child(vdev_t *pvd, vdev_t *cvd) 221{ 222 int c; 223 uint_t id = cvd->vdev_id; 224 225 ASSERT(cvd->vdev_parent == pvd); 226 227 if (pvd == NULL) 228 return; 229 230 ASSERT(id < pvd->vdev_children); 231 ASSERT(pvd->vdev_child[id] == cvd); 232 233 pvd->vdev_child[id] = NULL; 234 cvd->vdev_parent = NULL; 235 236 for (c = 0; c < pvd->vdev_children; c++) 237 if (pvd->vdev_child[c]) 238 break; 239 240 if (c == pvd->vdev_children) { 241 kmem_free(pvd->vdev_child, c * sizeof (vdev_t *)); 242 pvd->vdev_child = NULL; 243 pvd->vdev_children = 0; 244 } 245 246 /* 247 * Walk up all ancestors to update guid sum. 248 */ 249 for (; pvd != NULL; pvd = pvd->vdev_parent) 250 pvd->vdev_guid_sum -= cvd->vdev_guid_sum; 251 252 if (cvd->vdev_ops->vdev_op_leaf) 253 cvd->vdev_spa->spa_scrub_maxinflight -= zfs_scrub_limit; 254} 255 256/* 257 * Remove any holes in the child array. 258 */ 259void 260vdev_compact_children(vdev_t *pvd) 261{ 262 vdev_t **newchild, *cvd; 263 int oldc = pvd->vdev_children; 264 int newc, c; 265 266 ASSERT(spa_config_held(pvd->vdev_spa, SCL_ALL, RW_WRITER) == SCL_ALL); 267 268 for (c = newc = 0; c < oldc; c++) 269 if (pvd->vdev_child[c]) 270 newc++; 271 272 newchild = kmem_alloc(newc * sizeof (vdev_t *), KM_SLEEP); 273 274 for (c = newc = 0; c < oldc; c++) { 275 if ((cvd = pvd->vdev_child[c]) != NULL) { 276 newchild[newc] = cvd; 277 cvd->vdev_id = newc++; 278 } 279 } 280 281 kmem_free(pvd->vdev_child, oldc * sizeof (vdev_t *)); 282 pvd->vdev_child = newchild; 283 pvd->vdev_children = newc; 284} 285 286/* 287 * Allocate and minimally initialize a vdev_t. 288 */ 289static vdev_t * 290vdev_alloc_common(spa_t *spa, uint_t id, uint64_t guid, vdev_ops_t *ops) 291{ 292 vdev_t *vd; 293 294 vd = kmem_zalloc(sizeof (vdev_t), KM_SLEEP); 295 296 if (spa->spa_root_vdev == NULL) { 297 ASSERT(ops == &vdev_root_ops); 298 spa->spa_root_vdev = vd; 299 } 300 301 if (guid == 0) { 302 if (spa->spa_root_vdev == vd) { 303 /* 304 * The root vdev's guid will also be the pool guid, 305 * which must be unique among all pools. 306 */ 307 while (guid == 0 || spa_guid_exists(guid, 0)) 308 guid = spa_get_random(-1ULL); 309 } else { 310 /* 311 * Any other vdev's guid must be unique within the pool. 312 */ 313 while (guid == 0 || 314 spa_guid_exists(spa_guid(spa), guid)) 315 guid = spa_get_random(-1ULL); 316 } 317 ASSERT(!spa_guid_exists(spa_guid(spa), guid)); 318 } 319 320 vd->vdev_spa = spa; 321 vd->vdev_id = id; 322 vd->vdev_guid = guid; 323 vd->vdev_guid_sum = guid; 324 vd->vdev_ops = ops; 325 vd->vdev_state = VDEV_STATE_CLOSED; 326 327 mutex_init(&vd->vdev_dtl_lock, NULL, MUTEX_DEFAULT, NULL); 328 mutex_init(&vd->vdev_stat_lock, NULL, MUTEX_DEFAULT, NULL); 329 mutex_init(&vd->vdev_probe_lock, NULL, MUTEX_DEFAULT, NULL); 330 space_map_create(&vd->vdev_dtl_map, 0, -1ULL, 0, &vd->vdev_dtl_lock); 331 space_map_create(&vd->vdev_dtl_scrub, 0, -1ULL, 0, &vd->vdev_dtl_lock); 332 txg_list_create(&vd->vdev_ms_list, 333 offsetof(struct metaslab, ms_txg_node)); 334 txg_list_create(&vd->vdev_dtl_list, 335 offsetof(struct vdev, vdev_dtl_node)); 336 vd->vdev_stat.vs_timestamp = gethrtime(); 337 vdev_queue_init(vd); 338 vdev_cache_init(vd); 339 340 return (vd); 341} 342 343/* 344 * Allocate a new vdev. The 'alloctype' is used to control whether we are 345 * creating a new vdev or loading an existing one - the behavior is slightly 346 * different for each case. 347 */ 348int 349vdev_alloc(spa_t *spa, vdev_t **vdp, nvlist_t *nv, vdev_t *parent, uint_t id, 350 int alloctype) 351{ 352 vdev_ops_t *ops; 353 char *type; 354 uint64_t guid = 0, islog, nparity; 355 vdev_t *vd; 356 357 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL); 358 359 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_TYPE, &type) != 0) 360 return (EINVAL); 361 362 if ((ops = vdev_getops(type)) == NULL) 363 return (EINVAL); 364 365 /* 366 * If this is a load, get the vdev guid from the nvlist. 367 * Otherwise, vdev_alloc_common() will generate one for us. 368 */ 369 if (alloctype == VDEV_ALLOC_LOAD) { 370 uint64_t label_id; 371 372 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_ID, &label_id) || 373 label_id != id) 374 return (EINVAL); 375 376 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &guid) != 0) 377 return (EINVAL); 378 } else if (alloctype == VDEV_ALLOC_SPARE) { 379 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &guid) != 0) 380 return (EINVAL); 381 } else if (alloctype == VDEV_ALLOC_L2CACHE) { 382 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &guid) != 0) 383 return (EINVAL); 384 } 385 386 /* 387 * The first allocated vdev must be of type 'root'. 388 */ 389 if (ops != &vdev_root_ops && spa->spa_root_vdev == NULL) 390 return (EINVAL); 391 392 /* 393 * Determine whether we're a log vdev. 394 */ 395 islog = 0; 396 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_IS_LOG, &islog); 397 if (islog && spa_version(spa) < SPA_VERSION_SLOGS) 398 return (ENOTSUP); 399 400 /* 401 * Set the nparity property for RAID-Z vdevs. 402 */ 403 nparity = -1ULL; 404 if (ops == &vdev_raidz_ops) { 405 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_NPARITY, 406 &nparity) == 0) { 407 /* 408 * Currently, we can only support 2 parity devices. 409 */ 410 if (nparity == 0 || nparity > 2) 411 return (EINVAL); 412 /* 413 * Older versions can only support 1 parity device. 414 */ 415 if (nparity == 2 && 416 spa_version(spa) < SPA_VERSION_RAID6) 417 return (ENOTSUP); 418 } else { 419 /* 420 * We require the parity to be specified for SPAs that 421 * support multiple parity levels. 422 */ 423 if (spa_version(spa) >= SPA_VERSION_RAID6) 424 return (EINVAL); 425 /* 426 * Otherwise, we default to 1 parity device for RAID-Z. 427 */ 428 nparity = 1; 429 } 430 } else { 431 nparity = 0; 432 } 433 ASSERT(nparity != -1ULL); 434 435 vd = vdev_alloc_common(spa, id, guid, ops); 436 437 vd->vdev_islog = islog; 438 vd->vdev_nparity = nparity; 439 440 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_PATH, &vd->vdev_path) == 0) 441 vd->vdev_path = spa_strdup(vd->vdev_path); 442 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_DEVID, &vd->vdev_devid) == 0) 443 vd->vdev_devid = spa_strdup(vd->vdev_devid); 444 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_PHYS_PATH, 445 &vd->vdev_physpath) == 0) 446 vd->vdev_physpath = spa_strdup(vd->vdev_physpath); 447 448 /* 449 * Set the whole_disk property. If it's not specified, leave the value 450 * as -1. 451 */ 452 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_WHOLE_DISK, 453 &vd->vdev_wholedisk) != 0) 454 vd->vdev_wholedisk = -1ULL; 455 456 /* 457 * Look for the 'not present' flag. This will only be set if the device 458 * was not present at the time of import. 459 */ 460 if (!spa->spa_import_faulted) 461 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_NOT_PRESENT, 462 &vd->vdev_not_present); 463 464 /* 465 * Get the alignment requirement. 466 */ 467 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_ASHIFT, &vd->vdev_ashift); 468 469 /* 470 * If we're a top-level vdev, try to load the allocation parameters. 471 */ 472 if (parent && !parent->vdev_parent && alloctype == VDEV_ALLOC_LOAD) { 473 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_METASLAB_ARRAY, 474 &vd->vdev_ms_array); 475 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_METASLAB_SHIFT, 476 &vd->vdev_ms_shift); 477 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_ASIZE, 478 &vd->vdev_asize); 479 } 480 481 /* 482 * If we're a leaf vdev, try to load the DTL object and other state. 483 */ 484 if (vd->vdev_ops->vdev_op_leaf && 485 (alloctype == VDEV_ALLOC_LOAD || alloctype == VDEV_ALLOC_L2CACHE)) { 486 if (alloctype == VDEV_ALLOC_LOAD) { 487 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_DTL, 488 &vd->vdev_dtl.smo_object); 489 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_UNSPARE, 490 &vd->vdev_unspare); 491 } 492 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_OFFLINE, 493 &vd->vdev_offline); 494 495 /* 496 * When importing a pool, we want to ignore the persistent fault 497 * state, as the diagnosis made on another system may not be 498 * valid in the current context. 499 */ 500 if (spa->spa_load_state == SPA_LOAD_OPEN) { 501 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_FAULTED, 502 &vd->vdev_faulted); 503 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_DEGRADED, 504 &vd->vdev_degraded); 505 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_REMOVED, 506 &vd->vdev_removed); 507 } 508 } 509 510 /* 511 * Add ourselves to the parent's list of children. 512 */ 513 vdev_add_child(parent, vd); 514 515 *vdp = vd; 516 517 return (0); 518} 519 520void 521vdev_free(vdev_t *vd) 522{ 523 int c; 524 spa_t *spa = vd->vdev_spa; 525 526 /* 527 * vdev_free() implies closing the vdev first. This is simpler than 528 * trying to ensure complicated semantics for all callers. 529 */ 530 vdev_close(vd); 531 532 ASSERT(!list_link_active(&vd->vdev_config_dirty_node)); 533 534 /* 535 * Free all children. 536 */ 537 for (c = 0; c < vd->vdev_children; c++) 538 vdev_free(vd->vdev_child[c]); 539 540 ASSERT(vd->vdev_child == NULL); 541 ASSERT(vd->vdev_guid_sum == vd->vdev_guid); 542 543 /* 544 * Discard allocation state. 545 */ 546 if (vd == vd->vdev_top) 547 vdev_metaslab_fini(vd); 548 549 ASSERT3U(vd->vdev_stat.vs_space, ==, 0); 550 ASSERT3U(vd->vdev_stat.vs_dspace, ==, 0); 551 ASSERT3U(vd->vdev_stat.vs_alloc, ==, 0); 552 553 /* 554 * Remove this vdev from its parent's child list. 555 */ 556 vdev_remove_child(vd->vdev_parent, vd); 557 558 ASSERT(vd->vdev_parent == NULL); 559 560 /* 561 * Clean up vdev structure. 562 */ 563 vdev_queue_fini(vd); 564 vdev_cache_fini(vd); 565 566 if (vd->vdev_path) 567 spa_strfree(vd->vdev_path); 568 if (vd->vdev_devid) 569 spa_strfree(vd->vdev_devid); 570 if (vd->vdev_physpath) 571 spa_strfree(vd->vdev_physpath); 572 573 if (vd->vdev_isspare) 574 spa_spare_remove(vd); 575 if (vd->vdev_isl2cache) 576 spa_l2cache_remove(vd); 577 578 txg_list_destroy(&vd->vdev_ms_list); 579 txg_list_destroy(&vd->vdev_dtl_list); 580 mutex_enter(&vd->vdev_dtl_lock); 581 space_map_unload(&vd->vdev_dtl_map); 582 space_map_destroy(&vd->vdev_dtl_map); 583 space_map_vacate(&vd->vdev_dtl_scrub, NULL, NULL); 584 space_map_destroy(&vd->vdev_dtl_scrub); 585 mutex_exit(&vd->vdev_dtl_lock); 586 mutex_destroy(&vd->vdev_dtl_lock); 587 mutex_destroy(&vd->vdev_stat_lock); 588 mutex_destroy(&vd->vdev_probe_lock); 589 590 if (vd == spa->spa_root_vdev) 591 spa->spa_root_vdev = NULL; 592 593 kmem_free(vd, sizeof (vdev_t)); 594} 595 596/* 597 * Transfer top-level vdev state from svd to tvd. 598 */ 599static void 600vdev_top_transfer(vdev_t *svd, vdev_t *tvd) 601{ 602 spa_t *spa = svd->vdev_spa; 603 metaslab_t *msp; 604 vdev_t *vd; 605 int t; 606 607 ASSERT(tvd == tvd->vdev_top); 608 609 tvd->vdev_ms_array = svd->vdev_ms_array; 610 tvd->vdev_ms_shift = svd->vdev_ms_shift; 611 tvd->vdev_ms_count = svd->vdev_ms_count; 612 613 svd->vdev_ms_array = 0; 614 svd->vdev_ms_shift = 0; 615 svd->vdev_ms_count = 0; 616 617 tvd->vdev_mg = svd->vdev_mg; 618 tvd->vdev_ms = svd->vdev_ms; 619 620 svd->vdev_mg = NULL; 621 svd->vdev_ms = NULL; 622 623 if (tvd->vdev_mg != NULL) 624 tvd->vdev_mg->mg_vd = tvd; 625 626 tvd->vdev_stat.vs_alloc = svd->vdev_stat.vs_alloc; 627 tvd->vdev_stat.vs_space = svd->vdev_stat.vs_space; 628 tvd->vdev_stat.vs_dspace = svd->vdev_stat.vs_dspace; 629 630 svd->vdev_stat.vs_alloc = 0; 631 svd->vdev_stat.vs_space = 0; 632 svd->vdev_stat.vs_dspace = 0; 633 634 for (t = 0; t < TXG_SIZE; t++) { 635 while ((msp = txg_list_remove(&svd->vdev_ms_list, t)) != NULL) 636 (void) txg_list_add(&tvd->vdev_ms_list, msp, t); 637 while ((vd = txg_list_remove(&svd->vdev_dtl_list, t)) != NULL) 638 (void) txg_list_add(&tvd->vdev_dtl_list, vd, t); 639 if (txg_list_remove_this(&spa->spa_vdev_txg_list, svd, t)) 640 (void) txg_list_add(&spa->spa_vdev_txg_list, tvd, t); 641 } 642 643 if (list_link_active(&svd->vdev_config_dirty_node)) { 644 vdev_config_clean(svd); 645 vdev_config_dirty(tvd); 646 } 647 648 if (list_link_active(&svd->vdev_state_dirty_node)) { 649 vdev_state_clean(svd); 650 vdev_state_dirty(tvd); 651 } 652 653 tvd->vdev_deflate_ratio = svd->vdev_deflate_ratio; 654 svd->vdev_deflate_ratio = 0; 655 656 tvd->vdev_islog = svd->vdev_islog; 657 svd->vdev_islog = 0; 658} 659 660static void 661vdev_top_update(vdev_t *tvd, vdev_t *vd) 662{ 663 int c; 664 665 if (vd == NULL) 666 return; 667 668 vd->vdev_top = tvd; 669 670 for (c = 0; c < vd->vdev_children; c++) 671 vdev_top_update(tvd, vd->vdev_child[c]); 672} 673 674/* 675 * Add a mirror/replacing vdev above an existing vdev. 676 */ 677vdev_t * 678vdev_add_parent(vdev_t *cvd, vdev_ops_t *ops) 679{ 680 spa_t *spa = cvd->vdev_spa; 681 vdev_t *pvd = cvd->vdev_parent; 682 vdev_t *mvd; 683 684 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL); 685 686 mvd = vdev_alloc_common(spa, cvd->vdev_id, 0, ops); 687 688 mvd->vdev_asize = cvd->vdev_asize; 689 mvd->vdev_ashift = cvd->vdev_ashift; 690 mvd->vdev_state = cvd->vdev_state; 691 692 vdev_remove_child(pvd, cvd); 693 vdev_add_child(pvd, mvd); 694 cvd->vdev_id = mvd->vdev_children; 695 vdev_add_child(mvd, cvd); 696 vdev_top_update(cvd->vdev_top, cvd->vdev_top); 697 698 if (mvd == mvd->vdev_top) 699 vdev_top_transfer(cvd, mvd); 700 701 return (mvd); 702} 703 704/* 705 * Remove a 1-way mirror/replacing vdev from the tree. 706 */ 707void 708vdev_remove_parent(vdev_t *cvd) 709{ 710 vdev_t *mvd = cvd->vdev_parent; 711 vdev_t *pvd = mvd->vdev_parent; 712 713 ASSERT(spa_config_held(cvd->vdev_spa, SCL_ALL, RW_WRITER) == SCL_ALL); 714 715 ASSERT(mvd->vdev_children == 1); 716 ASSERT(mvd->vdev_ops == &vdev_mirror_ops || 717 mvd->vdev_ops == &vdev_replacing_ops || 718 mvd->vdev_ops == &vdev_spare_ops); 719 cvd->vdev_ashift = mvd->vdev_ashift; 720 721 vdev_remove_child(mvd, cvd); 722 vdev_remove_child(pvd, mvd); 723 /* 724 * If cvd will replace mvd as a top-level vdev, preserve mvd's guid. 725 * Otherwise, we could have detached an offline device, and when we 726 * go to import the pool we'll think we have two top-level vdevs, 727 * instead of a different version of the same top-level vdev. 728 */ 729 if (mvd->vdev_top == mvd) 730 cvd->vdev_guid = cvd->vdev_guid_sum = mvd->vdev_guid; 731 cvd->vdev_id = mvd->vdev_id; 732 vdev_add_child(pvd, cvd); 733 vdev_top_update(cvd->vdev_top, cvd->vdev_top); 734 735 if (cvd == cvd->vdev_top) 736 vdev_top_transfer(mvd, cvd); 737 738 ASSERT(mvd->vdev_children == 0); 739 vdev_free(mvd); 740} 741 742int 743vdev_metaslab_init(vdev_t *vd, uint64_t txg) 744{ 745 spa_t *spa = vd->vdev_spa; 746 objset_t *mos = spa->spa_meta_objset; 747 metaslab_class_t *mc; 748 uint64_t m; 749 uint64_t oldc = vd->vdev_ms_count; 750 uint64_t newc = vd->vdev_asize >> vd->vdev_ms_shift; 751 metaslab_t **mspp; 752 int error; 753 754 if (vd->vdev_ms_shift == 0) /* not being allocated from yet */ 755 return (0); 756 757 ASSERT(oldc <= newc); 758 759 if (vd->vdev_islog) 760 mc = spa->spa_log_class; 761 else 762 mc = spa->spa_normal_class; 763 764 if (vd->vdev_mg == NULL) 765 vd->vdev_mg = metaslab_group_create(mc, vd); 766 767 mspp = kmem_zalloc(newc * sizeof (*mspp), KM_SLEEP); 768 769 if (oldc != 0) { 770 bcopy(vd->vdev_ms, mspp, oldc * sizeof (*mspp)); 771 kmem_free(vd->vdev_ms, oldc * sizeof (*mspp)); 772 } 773 774 vd->vdev_ms = mspp; 775 vd->vdev_ms_count = newc; 776 777 for (m = oldc; m < newc; m++) { 778 space_map_obj_t smo = { 0, 0, 0 }; 779 if (txg == 0) { 780 uint64_t object = 0; 781 error = dmu_read(mos, vd->vdev_ms_array, 782 m * sizeof (uint64_t), sizeof (uint64_t), &object); 783 if (error) 784 return (error); 785 if (object != 0) { 786 dmu_buf_t *db; 787 error = dmu_bonus_hold(mos, object, FTAG, &db); 788 if (error) 789 return (error); 790 ASSERT3U(db->db_size, >=, sizeof (smo)); 791 bcopy(db->db_data, &smo, sizeof (smo)); 792 ASSERT3U(smo.smo_object, ==, object); 793 dmu_buf_rele(db, FTAG); 794 } 795 } 796 vd->vdev_ms[m] = metaslab_init(vd->vdev_mg, &smo, 797 m << vd->vdev_ms_shift, 1ULL << vd->vdev_ms_shift, txg); 798 } 799 800 return (0); 801} 802 803void 804vdev_metaslab_fini(vdev_t *vd) 805{ 806 uint64_t m; 807 uint64_t count = vd->vdev_ms_count; 808 809 if (vd->vdev_ms != NULL) { 810 for (m = 0; m < count; m++) 811 if (vd->vdev_ms[m] != NULL) 812 metaslab_fini(vd->vdev_ms[m]); 813 kmem_free(vd->vdev_ms, count * sizeof (metaslab_t *)); 814 vd->vdev_ms = NULL; 815 } 816} 817 818typedef struct vdev_probe_stats { 819 boolean_t vps_readable; 820 boolean_t vps_writeable; 821 int vps_flags; 822 zio_t *vps_root; 823 vdev_t *vps_vd; 824} vdev_probe_stats_t; 825 826static void 827vdev_probe_done(zio_t *zio) 828{ 829 vdev_probe_stats_t *vps = zio->io_private; 830 vdev_t *vd = vps->vps_vd; 831 832 if (zio->io_type == ZIO_TYPE_READ) { 833 ASSERT(zio->io_vd == vd); 834 if (zio->io_error == 0) 835 vps->vps_readable = 1; 836 if (zio->io_error == 0 && (spa_mode & FWRITE)) { 837 zio_nowait(zio_write_phys(vps->vps_root, vd, 838 zio->io_offset, zio->io_size, zio->io_data, 839 ZIO_CHECKSUM_OFF, vdev_probe_done, vps, 840 ZIO_PRIORITY_SYNC_WRITE, vps->vps_flags, B_TRUE)); 841 } else { 842 zio_buf_free(zio->io_data, zio->io_size); 843 } 844 } else if (zio->io_type == ZIO_TYPE_WRITE) { 845 ASSERT(zio->io_vd == vd); 846 if (zio->io_error == 0) 847 vps->vps_writeable = 1; 848 zio_buf_free(zio->io_data, zio->io_size); 849 } else if (zio->io_type == ZIO_TYPE_NULL) { 850 ASSERT(zio->io_vd == NULL); 851 ASSERT(zio == vps->vps_root); 852 853 vd->vdev_cant_read |= !vps->vps_readable; 854 vd->vdev_cant_write |= !vps->vps_writeable; 855 856 if (vdev_readable(vd) && 857 (vdev_writeable(vd) || !(spa_mode & FWRITE))) { 858 zio->io_error = 0; 859 } else { 860 ASSERT(zio->io_error != 0); 861 zfs_ereport_post(FM_EREPORT_ZFS_PROBE_FAILURE, 862 zio->io_spa, vd, NULL, 0, 0); 863 zio->io_error = ENXIO; 864 } 865 kmem_free(vps, sizeof (*vps)); 866 } 867} 868 869/* 870 * Determine whether this device is accessible by reading and writing 871 * to several known locations: the pad regions of each vdev label 872 * but the first (which we leave alone in case it contains a VTOC). 873 */ 874zio_t * 875vdev_probe(vdev_t *vd, zio_t *pio) 876{ 877 spa_t *spa = vd->vdev_spa; 878 vdev_probe_stats_t *vps; 879 zio_t *zio; 880 881 vps = kmem_zalloc(sizeof (*vps), KM_SLEEP); 882 883 vps->vps_flags = ZIO_FLAG_CANFAIL | ZIO_FLAG_PROBE | 884 ZIO_FLAG_DONT_CACHE | ZIO_FLAG_DONT_AGGREGATE | ZIO_FLAG_DONT_RETRY; 885 886 if (spa_config_held(spa, SCL_ZIO, RW_WRITER)) { 887 /* 888 * vdev_cant_read and vdev_cant_write can only transition 889 * from TRUE to FALSE when we have the SCL_ZIO lock as writer; 890 * otherwise they can only transition from FALSE to TRUE. 891 * This ensures that any zio looking at these values can 892 * assume that failures persist for the life of the I/O. 893 * That's important because when a device has intermittent 894 * connectivity problems, we want to ensure that they're 895 * ascribed to the device (ENXIO) and not the zio (EIO). 896 * 897 * Since we hold SCL_ZIO as writer here, clear both values 898 * so the probe can reevaluate from first principles. 899 */ 900 vps->vps_flags |= ZIO_FLAG_CONFIG_WRITER; 901 vd->vdev_cant_read = B_FALSE; 902 vd->vdev_cant_write = B_FALSE; 903 } 904 905 ASSERT(vd->vdev_ops->vdev_op_leaf); 906 907 zio = zio_null(pio, spa, vdev_probe_done, vps, vps->vps_flags); 908 909 vps->vps_root = zio; 910 vps->vps_vd = vd; 911 912 for (int l = 1; l < VDEV_LABELS; l++) { 913 zio_nowait(zio_read_phys(zio, vd, 914 vdev_label_offset(vd->vdev_psize, l, 915 offsetof(vdev_label_t, vl_pad)), 916 VDEV_SKIP_SIZE, zio_buf_alloc(VDEV_SKIP_SIZE), 917 ZIO_CHECKSUM_OFF, vdev_probe_done, vps, 918 ZIO_PRIORITY_SYNC_READ, vps->vps_flags, B_TRUE)); 919 } 920 921 return (zio); 922} 923 924/* 925 * Prepare a virtual device for access. 926 */ 927int 928vdev_open(vdev_t *vd) 929{ 930 int error; 931 int c; 932 uint64_t osize = 0; 933 uint64_t asize, psize; 934 uint64_t ashift = 0; 935 936 ASSERT(vd->vdev_state == VDEV_STATE_CLOSED || 937 vd->vdev_state == VDEV_STATE_CANT_OPEN || 938 vd->vdev_state == VDEV_STATE_OFFLINE); 939 940 vd->vdev_stat.vs_aux = VDEV_AUX_NONE; 941 942 if (!vd->vdev_removed && vd->vdev_faulted) { 943 ASSERT(vd->vdev_children == 0); 944 vdev_set_state(vd, B_TRUE, VDEV_STATE_FAULTED, 945 VDEV_AUX_ERR_EXCEEDED); 946 return (ENXIO); 947 } else if (vd->vdev_offline) { 948 ASSERT(vd->vdev_children == 0); 949 vdev_set_state(vd, B_TRUE, VDEV_STATE_OFFLINE, VDEV_AUX_NONE); 950 return (ENXIO); 951 } 952 953 error = vd->vdev_ops->vdev_op_open(vd, &osize, &ashift); 954 955 if (zio_injection_enabled && error == 0) 956 error = zio_handle_device_injection(vd, ENXIO); 957 958 if (error) { 959 if (vd->vdev_removed && 960 vd->vdev_stat.vs_aux != VDEV_AUX_OPEN_FAILED) 961 vd->vdev_removed = B_FALSE; 962 963 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 964 vd->vdev_stat.vs_aux); 965 return (error); 966 } 967 968 vd->vdev_removed = B_FALSE; 969 970 if (vd->vdev_degraded) { 971 ASSERT(vd->vdev_children == 0); 972 vdev_set_state(vd, B_TRUE, VDEV_STATE_DEGRADED, 973 VDEV_AUX_ERR_EXCEEDED); 974 } else { 975 vd->vdev_state = VDEV_STATE_HEALTHY; 976 } 977 978 for (c = 0; c < vd->vdev_children; c++) 979 if (vd->vdev_child[c]->vdev_state != VDEV_STATE_HEALTHY) { 980 vdev_set_state(vd, B_TRUE, VDEV_STATE_DEGRADED, 981 VDEV_AUX_NONE); 982 break; 983 } 984 985 osize = P2ALIGN(osize, (uint64_t)sizeof (vdev_label_t)); 986 987 if (vd->vdev_children == 0) { 988 if (osize < SPA_MINDEVSIZE) { 989 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 990 VDEV_AUX_TOO_SMALL); 991 return (EOVERFLOW); 992 } 993 psize = osize; 994 asize = osize - (VDEV_LABEL_START_SIZE + VDEV_LABEL_END_SIZE); 995 } else { 996 if (vd->vdev_parent != NULL && osize < SPA_MINDEVSIZE - 997 (VDEV_LABEL_START_SIZE + VDEV_LABEL_END_SIZE)) { 998 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 999 VDEV_AUX_TOO_SMALL); 1000 return (EOVERFLOW); 1001 } 1002 psize = 0; 1003 asize = osize; 1004 } 1005 1006 vd->vdev_psize = psize; 1007 1008 if (vd->vdev_asize == 0) { 1009 /* 1010 * This is the first-ever open, so use the computed values. 1011 * For testing purposes, a higher ashift can be requested. 1012 */ 1013 vd->vdev_asize = asize; 1014 vd->vdev_ashift = MAX(ashift, vd->vdev_ashift); 1015 } else { 1016 /* 1017 * Make sure the alignment requirement hasn't increased. 1018 */ 1019 if (ashift > vd->vdev_top->vdev_ashift) { 1020 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 1021 VDEV_AUX_BAD_LABEL); 1022 return (EINVAL); 1023 } 1024 1025 /* 1026 * Make sure the device hasn't shrunk. 1027 */ 1028 if (asize < vd->vdev_asize) { 1029 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 1030 VDEV_AUX_BAD_LABEL); 1031 return (EINVAL); 1032 } 1033 1034 /* 1035 * If all children are healthy and the asize has increased, 1036 * then we've experienced dynamic LUN growth. 1037 */ 1038 if (vd->vdev_state == VDEV_STATE_HEALTHY && 1039 asize > vd->vdev_asize) { 1040 vd->vdev_asize = asize; 1041 } 1042 } 1043 1044 /* 1045 * Ensure we can issue some IO before declaring the 1046 * vdev open for business. 1047 */ 1048 if (vd->vdev_ops->vdev_op_leaf && 1049 (error = zio_wait(vdev_probe(vd, NULL))) != 0) { 1050 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 1051 VDEV_AUX_IO_FAILURE); 1052 return (error); 1053 } 1054 1055 /* 1056 * If this is a top-level vdev, compute the raidz-deflation 1057 * ratio. Note, we hard-code in 128k (1<<17) because it is the 1058 * current "typical" blocksize. Even if SPA_MAXBLOCKSIZE 1059 * changes, this algorithm must never change, or we will 1060 * inconsistently account for existing bp's. 1061 */ 1062 if (vd->vdev_top == vd) { 1063 vd->vdev_deflate_ratio = (1<<17) / 1064 (vdev_psize_to_asize(vd, 1<<17) >> SPA_MINBLOCKSHIFT); 1065 } 1066 1067 /* 1068 * If a leaf vdev has a DTL, and seems healthy, then kick off a 1069 * resilver. But don't do this if we are doing a reopen for a 1070 * scrub, since this would just restart the scrub we are already 1071 * doing. 1072 */ 1073 if (vd->vdev_children == 0 && !vd->vdev_spa->spa_scrub_reopen) { 1074 mutex_enter(&vd->vdev_dtl_lock); 1075 if (vd->vdev_dtl_map.sm_space != 0 && vdev_writeable(vd)) 1076 spa_async_request(vd->vdev_spa, SPA_ASYNC_RESILVER); 1077 mutex_exit(&vd->vdev_dtl_lock); 1078 } 1079 1080 return (0); 1081} 1082 1083/* 1084 * Called once the vdevs are all opened, this routine validates the label 1085 * contents. This needs to be done before vdev_load() so that we don't 1086 * inadvertently do repair I/Os to the wrong device. 1087 * 1088 * This function will only return failure if one of the vdevs indicates that it 1089 * has since been destroyed or exported. This is only possible if 1090 * /etc/zfs/zpool.cache was readonly at the time. Otherwise, the vdev state 1091 * will be updated but the function will return 0. 1092 */ 1093int 1094vdev_validate(vdev_t *vd) 1095{ 1096 spa_t *spa = vd->vdev_spa; 1097 int c; 1098 nvlist_t *label; 1099 uint64_t guid, top_guid; 1100 uint64_t state; 1101 1102 for (c = 0; c < vd->vdev_children; c++) 1103 if (vdev_validate(vd->vdev_child[c]) != 0) 1104 return (EBADF); 1105 1106 /* 1107 * If the device has already failed, or was marked offline, don't do 1108 * any further validation. Otherwise, label I/O will fail and we will 1109 * overwrite the previous state. 1110 */ 1111 if (vd->vdev_ops->vdev_op_leaf && vdev_readable(vd)) { 1112 1113 if ((label = vdev_label_read_config(vd)) == NULL) { 1114 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 1115 VDEV_AUX_BAD_LABEL); 1116 return (0); 1117 } 1118 1119 if (nvlist_lookup_uint64(label, ZPOOL_CONFIG_POOL_GUID, 1120 &guid) != 0 || guid != spa_guid(spa)) { 1121 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 1122 VDEV_AUX_CORRUPT_DATA); 1123 nvlist_free(label); 1124 return (0); 1125 } 1126 1127 /* 1128 * If this vdev just became a top-level vdev because its 1129 * sibling was detached, it will have adopted the parent's 1130 * vdev guid -- but the label may or may not be on disk yet. 1131 * Fortunately, either version of the label will have the 1132 * same top guid, so if we're a top-level vdev, we can 1133 * safely compare to that instead. 1134 */ 1135 if (nvlist_lookup_uint64(label, ZPOOL_CONFIG_GUID, 1136 &guid) != 0 || 1137 nvlist_lookup_uint64(label, ZPOOL_CONFIG_TOP_GUID, 1138 &top_guid) != 0 || 1139 (vd->vdev_guid != guid && 1140 (vd->vdev_guid != top_guid || vd != vd->vdev_top))) { 1141 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 1142 VDEV_AUX_CORRUPT_DATA); 1143 nvlist_free(label); 1144 return (0); 1145 } 1146 1147 if (nvlist_lookup_uint64(label, ZPOOL_CONFIG_POOL_STATE, 1148 &state) != 0) { 1149 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 1150 VDEV_AUX_CORRUPT_DATA); 1151 nvlist_free(label); 1152 return (0); 1153 } 1154 1155 nvlist_free(label); 1156 1157 if (spa->spa_load_state == SPA_LOAD_OPEN && 1158 state != POOL_STATE_ACTIVE) 1159 return (EBADF); 1160 1161 /* 1162 * If we were able to open and validate a vdev that was 1163 * previously marked permanently unavailable, clear that state 1164 * now. 1165 */ 1166 if (vd->vdev_not_present) 1167 vd->vdev_not_present = 0; 1168 } 1169 1170 return (0); 1171} 1172 1173/* 1174 * Close a virtual device. 1175 */ 1176void 1177vdev_close(vdev_t *vd) 1178{ 1179 vd->vdev_ops->vdev_op_close(vd); 1180 1181 vdev_cache_purge(vd); 1182 1183 /* 1184 * We record the previous state before we close it, so that if we are 1185 * doing a reopen(), we don't generate FMA ereports if we notice that 1186 * it's still faulted. 1187 */ 1188 vd->vdev_prevstate = vd->vdev_state; 1189 1190 if (vd->vdev_offline) 1191 vd->vdev_state = VDEV_STATE_OFFLINE; 1192 else 1193 vd->vdev_state = VDEV_STATE_CLOSED; 1194 vd->vdev_stat.vs_aux = VDEV_AUX_NONE; 1195} 1196 1197void 1198vdev_reopen(vdev_t *vd) 1199{ 1200 spa_t *spa = vd->vdev_spa; 1201 1202 ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL); 1203 1204 vdev_close(vd); 1205 (void) vdev_open(vd); 1206 1207 /* 1208 * Call vdev_validate() here to make sure we have the same device. 1209 * Otherwise, a device with an invalid label could be successfully 1210 * opened in response to vdev_reopen(). 1211 */ 1212 if (vd->vdev_aux) { 1213 (void) vdev_validate_aux(vd); 1214 if (vdev_readable(vd) && vdev_writeable(vd) && 1215 !l2arc_vdev_present(vd)) { 1216 uint64_t size = vdev_get_rsize(vd); 1217 l2arc_add_vdev(spa, vd, 1218 VDEV_LABEL_START_SIZE, 1219 size - VDEV_LABEL_START_SIZE); 1220 } 1221 } else { 1222 (void) vdev_validate(vd); 1223 } 1224 1225 /* 1226 * Reassess parent vdev's health. 1227 */ 1228 vdev_propagate_state(vd); 1229} 1230 1231int 1232vdev_create(vdev_t *vd, uint64_t txg, boolean_t isreplacing) 1233{ 1234 int error; 1235 1236 /* 1237 * Normally, partial opens (e.g. of a mirror) are allowed. 1238 * For a create, however, we want to fail the request if 1239 * there are any components we can't open. 1240 */ 1241 error = vdev_open(vd); 1242 1243 if (error || vd->vdev_state != VDEV_STATE_HEALTHY) { 1244 vdev_close(vd); 1245 return (error ? error : ENXIO); 1246 } 1247 1248 /* 1249 * Recursively initialize all labels. 1250 */ 1251 if ((error = vdev_label_init(vd, txg, isreplacing ? 1252 VDEV_LABEL_REPLACE : VDEV_LABEL_CREATE)) != 0) { 1253 vdev_close(vd); 1254 return (error); 1255 } 1256 1257 return (0); 1258} 1259 1260/* 1261 * The is the latter half of vdev_create(). It is distinct because it 1262 * involves initiating transactions in order to do metaslab creation. 1263 * For creation, we want to try to create all vdevs at once and then undo it 1264 * if anything fails; this is much harder if we have pending transactions. 1265 */ 1266void 1267vdev_init(vdev_t *vd, uint64_t txg) 1268{ 1269 /* 1270 * Aim for roughly 200 metaslabs per vdev. 1271 */ 1272 vd->vdev_ms_shift = highbit(vd->vdev_asize / 200); 1273 vd->vdev_ms_shift = MAX(vd->vdev_ms_shift, SPA_MAXBLOCKSHIFT); 1274 1275 /* 1276 * Initialize the vdev's metaslabs. This can't fail because 1277 * there's nothing to read when creating all new metaslabs. 1278 */ 1279 VERIFY(vdev_metaslab_init(vd, txg) == 0); 1280} 1281 1282void 1283vdev_dirty(vdev_t *vd, int flags, void *arg, uint64_t txg) 1284{ 1285 ASSERT(vd == vd->vdev_top); 1286 ASSERT(ISP2(flags)); 1287 1288 if (flags & VDD_METASLAB) 1289 (void) txg_list_add(&vd->vdev_ms_list, arg, txg); 1290 1291 if (flags & VDD_DTL) 1292 (void) txg_list_add(&vd->vdev_dtl_list, arg, txg); 1293 1294 (void) txg_list_add(&vd->vdev_spa->spa_vdev_txg_list, vd, txg); 1295} 1296 1297void 1298vdev_dtl_dirty(space_map_t *sm, uint64_t txg, uint64_t size) 1299{ 1300 mutex_enter(sm->sm_lock); 1301 if (!space_map_contains(sm, txg, size)) 1302 space_map_add(sm, txg, size); 1303 mutex_exit(sm->sm_lock); 1304} 1305 1306int 1307vdev_dtl_contains(space_map_t *sm, uint64_t txg, uint64_t size) 1308{ 1309 int dirty; 1310 1311 /* 1312 * Quick test without the lock -- covers the common case that 1313 * there are no dirty time segments. 1314 */ 1315 if (sm->sm_space == 0) 1316 return (0); 1317 1318 mutex_enter(sm->sm_lock); 1319 dirty = space_map_contains(sm, txg, size); 1320 mutex_exit(sm->sm_lock); 1321 1322 return (dirty); 1323} 1324 1325/* 1326 * Reassess DTLs after a config change or scrub completion. 1327 */ 1328void 1329vdev_dtl_reassess(vdev_t *vd, uint64_t txg, uint64_t scrub_txg, int scrub_done) 1330{ 1331 spa_t *spa = vd->vdev_spa; 1332 int c; 1333 1334 ASSERT(spa_config_held(spa, SCL_CONFIG, RW_READER)); 1335 1336 if (vd->vdev_children == 0) { 1337 mutex_enter(&vd->vdev_dtl_lock); 1338 if (scrub_txg != 0 && 1339 (spa->spa_scrub_started || spa->spa_scrub_errors == 0)) { 1340 /* XXX should check scrub_done? */ 1341 /* 1342 * We completed a scrub up to scrub_txg. If we 1343 * did it without rebooting, then the scrub dtl 1344 * will be valid, so excise the old region and 1345 * fold in the scrub dtl. Otherwise, leave the 1346 * dtl as-is if there was an error. 1347 */ 1348 space_map_excise(&vd->vdev_dtl_map, 0, scrub_txg); 1349 space_map_union(&vd->vdev_dtl_map, &vd->vdev_dtl_scrub); 1350 } 1351 if (scrub_done) 1352 space_map_vacate(&vd->vdev_dtl_scrub, NULL, NULL); 1353 mutex_exit(&vd->vdev_dtl_lock); 1354 1355 if (txg != 0) 1356 vdev_dirty(vd->vdev_top, VDD_DTL, vd, txg); 1357 return; 1358 } 1359 1360 /* 1361 * Make sure the DTLs are always correct under the scrub lock. 1362 */ 1363 if (vd == spa->spa_root_vdev) 1364 mutex_enter(&spa->spa_scrub_lock); 1365 1366 mutex_enter(&vd->vdev_dtl_lock); 1367 space_map_vacate(&vd->vdev_dtl_map, NULL, NULL); 1368 space_map_vacate(&vd->vdev_dtl_scrub, NULL, NULL); 1369 mutex_exit(&vd->vdev_dtl_lock); 1370 1371 for (c = 0; c < vd->vdev_children; c++) { 1372 vdev_t *cvd = vd->vdev_child[c]; 1373 vdev_dtl_reassess(cvd, txg, scrub_txg, scrub_done); 1374 mutex_enter(&vd->vdev_dtl_lock); 1375 space_map_union(&vd->vdev_dtl_map, &cvd->vdev_dtl_map); 1376 space_map_union(&vd->vdev_dtl_scrub, &cvd->vdev_dtl_scrub); 1377 mutex_exit(&vd->vdev_dtl_lock); 1378 } 1379 1380 if (vd == spa->spa_root_vdev) 1381 mutex_exit(&spa->spa_scrub_lock); 1382} 1383 1384static int 1385vdev_dtl_load(vdev_t *vd) 1386{ 1387 spa_t *spa = vd->vdev_spa; 1388 space_map_obj_t *smo = &vd->vdev_dtl; 1389 objset_t *mos = spa->spa_meta_objset; 1390 dmu_buf_t *db; 1391 int error; 1392 1393 ASSERT(vd->vdev_children == 0); 1394 1395 if (smo->smo_object == 0) 1396 return (0); 1397 1398 if ((error = dmu_bonus_hold(mos, smo->smo_object, FTAG, &db)) != 0) 1399 return (error); 1400 1401 ASSERT3U(db->db_size, >=, sizeof (*smo)); 1402 bcopy(db->db_data, smo, sizeof (*smo)); 1403 dmu_buf_rele(db, FTAG); 1404 1405 mutex_enter(&vd->vdev_dtl_lock); 1406 error = space_map_load(&vd->vdev_dtl_map, NULL, SM_ALLOC, smo, mos); 1407 mutex_exit(&vd->vdev_dtl_lock); 1408 1409 return (error); 1410} 1411 1412void 1413vdev_dtl_sync(vdev_t *vd, uint64_t txg) 1414{ 1415 spa_t *spa = vd->vdev_spa; 1416 space_map_obj_t *smo = &vd->vdev_dtl; 1417 space_map_t *sm = &vd->vdev_dtl_map; 1418 objset_t *mos = spa->spa_meta_objset; 1419 space_map_t smsync; 1420 kmutex_t smlock; 1421 dmu_buf_t *db; 1422 dmu_tx_t *tx; 1423 1424 tx = dmu_tx_create_assigned(spa->spa_dsl_pool, txg); 1425 1426 if (vd->vdev_detached) { 1427 if (smo->smo_object != 0) { 1428 int err = dmu_object_free(mos, smo->smo_object, tx); 1429 ASSERT3U(err, ==, 0); 1430 smo->smo_object = 0; 1431 } 1432 dmu_tx_commit(tx); 1433 return; 1434 } 1435 1436 if (smo->smo_object == 0) { 1437 ASSERT(smo->smo_objsize == 0); 1438 ASSERT(smo->smo_alloc == 0); 1439 smo->smo_object = dmu_object_alloc(mos, 1440 DMU_OT_SPACE_MAP, 1 << SPACE_MAP_BLOCKSHIFT, 1441 DMU_OT_SPACE_MAP_HEADER, sizeof (*smo), tx); 1442 ASSERT(smo->smo_object != 0); 1443 vdev_config_dirty(vd->vdev_top); 1444 } 1445 1446 mutex_init(&smlock, NULL, MUTEX_DEFAULT, NULL); 1447 1448 space_map_create(&smsync, sm->sm_start, sm->sm_size, sm->sm_shift, 1449 &smlock); 1450 1451 mutex_enter(&smlock); 1452 1453 mutex_enter(&vd->vdev_dtl_lock); 1454 space_map_walk(sm, space_map_add, &smsync); 1455 mutex_exit(&vd->vdev_dtl_lock); 1456 1457 space_map_truncate(smo, mos, tx); 1458 space_map_sync(&smsync, SM_ALLOC, smo, mos, tx); 1459 1460 space_map_destroy(&smsync); 1461 1462 mutex_exit(&smlock); 1463 mutex_destroy(&smlock); 1464 1465 VERIFY(0 == dmu_bonus_hold(mos, smo->smo_object, FTAG, &db)); 1466 dmu_buf_will_dirty(db, tx); 1467 ASSERT3U(db->db_size, >=, sizeof (*smo)); 1468 bcopy(smo, db->db_data, sizeof (*smo)); 1469 dmu_buf_rele(db, FTAG); 1470 1471 dmu_tx_commit(tx); 1472} 1473 1474/* 1475 * Determine if resilver is needed, and if so the txg range. 1476 */ 1477boolean_t 1478vdev_resilver_needed(vdev_t *vd, uint64_t *minp, uint64_t *maxp) 1479{ 1480 boolean_t needed = B_FALSE; 1481 uint64_t thismin = UINT64_MAX; 1482 uint64_t thismax = 0; 1483 1484 if (vd->vdev_children == 0) { 1485 mutex_enter(&vd->vdev_dtl_lock); 1486 if (vd->vdev_dtl_map.sm_space != 0 && vdev_writeable(vd)) { 1487 space_seg_t *ss; 1488 1489 ss = avl_first(&vd->vdev_dtl_map.sm_root); 1490 thismin = ss->ss_start - 1; 1491 ss = avl_last(&vd->vdev_dtl_map.sm_root); 1492 thismax = ss->ss_end; 1493 needed = B_TRUE; 1494 } 1495 mutex_exit(&vd->vdev_dtl_lock); 1496 } else { 1497 int c; 1498 for (c = 0; c < vd->vdev_children; c++) { 1499 vdev_t *cvd = vd->vdev_child[c]; 1500 uint64_t cmin, cmax; 1501 1502 if (vdev_resilver_needed(cvd, &cmin, &cmax)) { 1503 thismin = MIN(thismin, cmin); 1504 thismax = MAX(thismax, cmax); 1505 needed = B_TRUE; 1506 } 1507 } 1508 } 1509 1510 if (needed && minp) { 1511 *minp = thismin; 1512 *maxp = thismax; 1513 } 1514 return (needed); 1515} 1516 1517void 1518vdev_load(vdev_t *vd) 1519{ 1520 int c; 1521 1522 /* 1523 * Recursively load all children. 1524 */ 1525 for (c = 0; c < vd->vdev_children; c++) 1526 vdev_load(vd->vdev_child[c]); 1527 1528 /* 1529 * If this is a top-level vdev, initialize its metaslabs. 1530 */ 1531 if (vd == vd->vdev_top && 1532 (vd->vdev_ashift == 0 || vd->vdev_asize == 0 || 1533 vdev_metaslab_init(vd, 0) != 0)) 1534 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 1535 VDEV_AUX_CORRUPT_DATA); 1536 1537 /* 1538 * If this is a leaf vdev, load its DTL. 1539 */ 1540 if (vd->vdev_ops->vdev_op_leaf && vdev_dtl_load(vd) != 0) 1541 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 1542 VDEV_AUX_CORRUPT_DATA); 1543} 1544 1545/* 1546 * The special vdev case is used for hot spares and l2cache devices. Its 1547 * sole purpose it to set the vdev state for the associated vdev. To do this, 1548 * we make sure that we can open the underlying device, then try to read the 1549 * label, and make sure that the label is sane and that it hasn't been 1550 * repurposed to another pool. 1551 */ 1552int 1553vdev_validate_aux(vdev_t *vd) 1554{ 1555 nvlist_t *label; 1556 uint64_t guid, version; 1557 uint64_t state; 1558 1559 if (!vdev_readable(vd)) 1560 return (0); 1561 1562 if ((label = vdev_label_read_config(vd)) == NULL) { 1563 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 1564 VDEV_AUX_CORRUPT_DATA); 1565 return (-1); 1566 } 1567 1568 if (nvlist_lookup_uint64(label, ZPOOL_CONFIG_VERSION, &version) != 0 || 1569 version > SPA_VERSION || 1570 nvlist_lookup_uint64(label, ZPOOL_CONFIG_GUID, &guid) != 0 || 1571 guid != vd->vdev_guid || 1572 nvlist_lookup_uint64(label, ZPOOL_CONFIG_POOL_STATE, &state) != 0) { 1573 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 1574 VDEV_AUX_CORRUPT_DATA); 1575 nvlist_free(label); 1576 return (-1); 1577 } 1578 1579 /* 1580 * We don't actually check the pool state here. If it's in fact in 1581 * use by another pool, we update this fact on the fly when requested. 1582 */ 1583 nvlist_free(label); 1584 return (0); 1585} 1586 1587void 1588vdev_sync_done(vdev_t *vd, uint64_t txg) 1589{ 1590 metaslab_t *msp; 1591 1592 while (msp = txg_list_remove(&vd->vdev_ms_list, TXG_CLEAN(txg))) 1593 metaslab_sync_done(msp, txg); 1594} 1595 1596void 1597vdev_sync(vdev_t *vd, uint64_t txg) 1598{ 1599 spa_t *spa = vd->vdev_spa; 1600 vdev_t *lvd; 1601 metaslab_t *msp; 1602 dmu_tx_t *tx; 1603 1604 if (vd->vdev_ms_array == 0 && vd->vdev_ms_shift != 0) { 1605 ASSERT(vd == vd->vdev_top); 1606 tx = dmu_tx_create_assigned(spa->spa_dsl_pool, txg); 1607 vd->vdev_ms_array = dmu_object_alloc(spa->spa_meta_objset, 1608 DMU_OT_OBJECT_ARRAY, 0, DMU_OT_NONE, 0, tx); 1609 ASSERT(vd->vdev_ms_array != 0); 1610 vdev_config_dirty(vd); 1611 dmu_tx_commit(tx); 1612 } 1613 1614 while ((msp = txg_list_remove(&vd->vdev_ms_list, txg)) != NULL) { 1615 metaslab_sync(msp, txg); 1616 (void) txg_list_add(&vd->vdev_ms_list, msp, TXG_CLEAN(txg)); 1617 } 1618 1619 while ((lvd = txg_list_remove(&vd->vdev_dtl_list, txg)) != NULL) 1620 vdev_dtl_sync(lvd, txg); 1621 1622 (void) txg_list_add(&spa->spa_vdev_txg_list, vd, TXG_CLEAN(txg)); 1623} 1624 1625uint64_t 1626vdev_psize_to_asize(vdev_t *vd, uint64_t psize) 1627{ 1628 return (vd->vdev_ops->vdev_op_asize(vd, psize)); 1629} 1630 1631/* 1632 * Mark the given vdev faulted. A faulted vdev behaves as if the device could 1633 * not be opened, and no I/O is attempted. 1634 */ 1635int 1636vdev_fault(spa_t *spa, uint64_t guid) 1637{ 1638 vdev_t *vd; 1639 1640 spa_vdev_state_enter(spa); 1641 1642 if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL) 1643 return (spa_vdev_state_exit(spa, NULL, ENODEV)); 1644 1645 if (!vd->vdev_ops->vdev_op_leaf) 1646 return (spa_vdev_state_exit(spa, NULL, ENOTSUP)); 1647 1648 /* 1649 * Faulted state takes precedence over degraded. 1650 */ 1651 vd->vdev_faulted = 1ULL; 1652 vd->vdev_degraded = 0ULL; 1653 vdev_set_state(vd, B_FALSE, VDEV_STATE_FAULTED, VDEV_AUX_ERR_EXCEEDED); 1654 1655 /* 1656 * If marking the vdev as faulted cause the top-level vdev to become 1657 * unavailable, then back off and simply mark the vdev as degraded 1658 * instead. 1659 */ 1660 if (vdev_is_dead(vd->vdev_top) && vd->vdev_aux == NULL) { 1661 vd->vdev_degraded = 1ULL; 1662 vd->vdev_faulted = 0ULL; 1663 1664 /* 1665 * If we reopen the device and it's not dead, only then do we 1666 * mark it degraded. 1667 */ 1668 vdev_reopen(vd); 1669 1670 if (vdev_readable(vd)) { 1671 vdev_set_state(vd, B_FALSE, VDEV_STATE_DEGRADED, 1672 VDEV_AUX_ERR_EXCEEDED); 1673 } 1674 } 1675 1676 return (spa_vdev_state_exit(spa, vd, 0)); 1677} 1678 1679/* 1680 * Mark the given vdev degraded. A degraded vdev is purely an indication to the 1681 * user that something is wrong. The vdev continues to operate as normal as far 1682 * as I/O is concerned. 1683 */ 1684int 1685vdev_degrade(spa_t *spa, uint64_t guid) 1686{ 1687 vdev_t *vd; 1688 1689 spa_vdev_state_enter(spa); 1690 1691 if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL) 1692 return (spa_vdev_state_exit(spa, NULL, ENODEV)); 1693 1694 if (!vd->vdev_ops->vdev_op_leaf) 1695 return (spa_vdev_state_exit(spa, NULL, ENOTSUP)); 1696 1697 /* 1698 * If the vdev is already faulted, then don't do anything. 1699 */ 1700 if (vd->vdev_faulted || vd->vdev_degraded) 1701 return (spa_vdev_state_exit(spa, NULL, 0)); 1702 1703 vd->vdev_degraded = 1ULL; 1704 if (!vdev_is_dead(vd)) 1705 vdev_set_state(vd, B_FALSE, VDEV_STATE_DEGRADED, 1706 VDEV_AUX_ERR_EXCEEDED); 1707 1708 return (spa_vdev_state_exit(spa, vd, 0)); 1709} 1710 1711/* 1712 * Online the given vdev. If 'unspare' is set, it implies two things. First, 1713 * any attached spare device should be detached when the device finishes 1714 * resilvering. Second, the online should be treated like a 'test' online case, 1715 * so no FMA events are generated if the device fails to open. 1716 */ 1717int 1718vdev_online(spa_t *spa, uint64_t guid, uint64_t flags, vdev_state_t *newstate) 1719{ 1720 vdev_t *vd; 1721 1722 spa_vdev_state_enter(spa); 1723 1724 if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL) 1725 return (spa_vdev_state_exit(spa, NULL, ENODEV)); 1726 1727 if (!vd->vdev_ops->vdev_op_leaf) 1728 return (spa_vdev_state_exit(spa, NULL, ENOTSUP)); 1729 1730 vd->vdev_offline = B_FALSE; 1731 vd->vdev_tmpoffline = B_FALSE; 1732 vd->vdev_checkremove = !!(flags & ZFS_ONLINE_CHECKREMOVE); 1733 vd->vdev_forcefault = !!(flags & ZFS_ONLINE_FORCEFAULT); 1734 vdev_reopen(vd->vdev_top); 1735 vd->vdev_checkremove = vd->vdev_forcefault = B_FALSE; 1736 1737 if (newstate) 1738 *newstate = vd->vdev_state; 1739 if ((flags & ZFS_ONLINE_UNSPARE) && 1740 !vdev_is_dead(vd) && vd->vdev_parent && 1741 vd->vdev_parent->vdev_ops == &vdev_spare_ops && 1742 vd->vdev_parent->vdev_child[0] == vd) 1743 vd->vdev_unspare = B_TRUE; 1744 1745 (void) spa_vdev_state_exit(spa, vd, 0); 1746 1747 VERIFY3U(spa_scrub(spa, POOL_SCRUB_RESILVER), ==, 0); 1748 1749 return (0); 1750} 1751 1752int 1753vdev_offline(spa_t *spa, uint64_t guid, uint64_t flags) 1754{ 1755 vdev_t *vd; 1756 1757 spa_vdev_state_enter(spa); 1758 1759 if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL) 1760 return (spa_vdev_state_exit(spa, NULL, ENODEV)); 1761 1762 if (!vd->vdev_ops->vdev_op_leaf) 1763 return (spa_vdev_state_exit(spa, NULL, ENOTSUP)); 1764 1765 /* 1766 * If the device isn't already offline, try to offline it. 1767 */ 1768 if (!vd->vdev_offline) { 1769 /* 1770 * If this device's top-level vdev has a non-empty DTL, 1771 * don't allow the device to be offlined. 1772 * 1773 * XXX -- make this more precise by allowing the offline 1774 * as long as the remaining devices don't have any DTL holes. 1775 */ 1776 if (vd->vdev_top->vdev_dtl_map.sm_space != 0) 1777 return (spa_vdev_state_exit(spa, NULL, EBUSY)); 1778 1779 /* 1780 * Offline this device and reopen its top-level vdev. 1781 * If this action results in the top-level vdev becoming 1782 * unusable, undo it and fail the request. 1783 */ 1784 vd->vdev_offline = B_TRUE; 1785 vdev_reopen(vd->vdev_top); 1786 if (vdev_is_dead(vd->vdev_top) && vd->vdev_aux == NULL) { 1787 vd->vdev_offline = B_FALSE; 1788 vdev_reopen(vd->vdev_top); 1789 return (spa_vdev_state_exit(spa, NULL, EBUSY)); 1790 } 1791 } 1792 1793 vd->vdev_tmpoffline = !!(flags & ZFS_OFFLINE_TEMPORARY); 1794 1795 return (spa_vdev_state_exit(spa, vd, 0)); 1796} 1797 1798/* 1799 * Clear the error counts associated with this vdev. Unlike vdev_online() and 1800 * vdev_offline(), we assume the spa config is locked. We also clear all 1801 * children. If 'vd' is NULL, then the user wants to clear all vdevs. 1802 */ 1803void 1804vdev_clear(spa_t *spa, vdev_t *vd) 1805{ 1806 vdev_t *rvd = spa->spa_root_vdev; 1807 1808 ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL); 1809 1810 if (vd == NULL) 1811 vd = rvd; 1812 1813 vd->vdev_stat.vs_read_errors = 0; 1814 vd->vdev_stat.vs_write_errors = 0; 1815 vd->vdev_stat.vs_checksum_errors = 0; 1816 1817 for (int c = 0; c < vd->vdev_children; c++) 1818 vdev_clear(spa, vd->vdev_child[c]); 1819 1820 /* 1821 * If we're in the FAULTED state or have experienced failed I/O, then 1822 * clear the persistent state and attempt to reopen the device. We 1823 * also mark the vdev config dirty, so that the new faulted state is 1824 * written out to disk. 1825 */ 1826 if (vd->vdev_faulted || vd->vdev_degraded || 1827 !vdev_readable(vd) || !vdev_writeable(vd)) { 1828 1829 vd->vdev_faulted = vd->vdev_degraded = 0; 1830 vd->vdev_cant_read = B_FALSE; 1831 vd->vdev_cant_write = B_FALSE; 1832 1833 vdev_reopen(vd); 1834 1835 if (vd != rvd) 1836 vdev_state_dirty(vd->vdev_top); 1837 1838 if (vd->vdev_aux == NULL && !vdev_is_dead(vd)) 1839 spa_async_request(spa, SPA_ASYNC_RESILVER); 1840 1841 spa_event_notify(spa, vd, ESC_ZFS_VDEV_CLEAR); 1842 } 1843} 1844 1845boolean_t 1846vdev_is_dead(vdev_t *vd) 1847{ 1848 return (vd->vdev_state < VDEV_STATE_DEGRADED); 1849} 1850 1851boolean_t 1852vdev_readable(vdev_t *vd) 1853{ 1854 return (!vdev_is_dead(vd) && !vd->vdev_cant_read); 1855} 1856 1857boolean_t 1858vdev_writeable(vdev_t *vd) 1859{ 1860 return (!vdev_is_dead(vd) && !vd->vdev_cant_write); 1861} 1862 1863boolean_t 1864vdev_accessible(vdev_t *vd, zio_t *zio) 1865{ 1866 ASSERT(zio->io_vd == vd); 1867 1868 if (vdev_is_dead(vd) || vd->vdev_remove_wanted) 1869 return (B_FALSE); 1870 1871 if (zio->io_type == ZIO_TYPE_READ) 1872 return (!vd->vdev_cant_read); 1873 1874 if (zio->io_type == ZIO_TYPE_WRITE) 1875 return (!vd->vdev_cant_write); 1876 1877 return (B_TRUE); 1878} 1879 1880/* 1881 * Get statistics for the given vdev. 1882 */ 1883void 1884vdev_get_stats(vdev_t *vd, vdev_stat_t *vs) 1885{ 1886 vdev_t *rvd = vd->vdev_spa->spa_root_vdev; 1887 1888 mutex_enter(&vd->vdev_stat_lock); 1889 bcopy(&vd->vdev_stat, vs, sizeof (*vs)); 1890 vs->vs_scrub_errors = vd->vdev_spa->spa_scrub_errors; 1891 vs->vs_timestamp = gethrtime() - vs->vs_timestamp; 1892 vs->vs_state = vd->vdev_state; 1893 vs->vs_rsize = vdev_get_rsize(vd); 1894 mutex_exit(&vd->vdev_stat_lock); 1895 1896 /* 1897 * If we're getting stats on the root vdev, aggregate the I/O counts 1898 * over all top-level vdevs (i.e. the direct children of the root). 1899 */ 1900 if (vd == rvd) { 1901 for (int c = 0; c < rvd->vdev_children; c++) { 1902 vdev_t *cvd = rvd->vdev_child[c]; 1903 vdev_stat_t *cvs = &cvd->vdev_stat; 1904 1905 mutex_enter(&vd->vdev_stat_lock); 1906 for (int t = 0; t < ZIO_TYPES; t++) { 1907 vs->vs_ops[t] += cvs->vs_ops[t]; 1908 vs->vs_bytes[t] += cvs->vs_bytes[t]; 1909 } 1910 vs->vs_scrub_examined += cvs->vs_scrub_examined; 1911 mutex_exit(&vd->vdev_stat_lock); 1912 } 1913 } 1914} 1915 1916void 1917vdev_clear_stats(vdev_t *vd) 1918{ 1919 mutex_enter(&vd->vdev_stat_lock); 1920 vd->vdev_stat.vs_space = 0; 1921 vd->vdev_stat.vs_dspace = 0; 1922 vd->vdev_stat.vs_alloc = 0; 1923 mutex_exit(&vd->vdev_stat_lock); 1924} 1925 1926void 1927vdev_stat_update(zio_t *zio, uint64_t psize) 1928{ 1929 vdev_t *rvd = zio->io_spa->spa_root_vdev; 1930 vdev_t *vd = zio->io_vd ? zio->io_vd : rvd; 1931 vdev_t *pvd; 1932 uint64_t txg = zio->io_txg; 1933 vdev_stat_t *vs = &vd->vdev_stat; 1934 zio_type_t type = zio->io_type; 1935 int flags = zio->io_flags; 1936 1937 /* 1938 * If this i/o is a gang leader, it didn't do any actual work. 1939 */ 1940 if (zio->io_gang_tree) 1941 return; 1942 1943 if (zio->io_error == 0) { 1944 /* 1945 * If this is a root i/o, don't count it -- we've already 1946 * counted the top-level vdevs, and vdev_get_stats() will 1947 * aggregate them when asked. This reduces contention on 1948 * the root vdev_stat_lock and implicitly handles blocks 1949 * that compress away to holes, for which there is no i/o. 1950 * (Holes never create vdev children, so all the counters 1951 * remain zero, which is what we want.) 1952 * 1953 * Note: this only applies to successful i/o (io_error == 0) 1954 * because unlike i/o counts, errors are not additive. 1955 * When reading a ditto block, for example, failure of 1956 * one top-level vdev does not imply a root-level error. 1957 */ 1958 if (vd == rvd) 1959 return; 1960 1961 ASSERT(vd == zio->io_vd); 1962 if (!(flags & ZIO_FLAG_IO_BYPASS)) { 1963 mutex_enter(&vd->vdev_stat_lock); 1964 vs->vs_ops[type]++; 1965 vs->vs_bytes[type] += psize; 1966 mutex_exit(&vd->vdev_stat_lock); 1967 } 1968 if (flags & ZIO_FLAG_IO_REPAIR) { 1969 ASSERT(zio->io_delegate_list == NULL); 1970 mutex_enter(&vd->vdev_stat_lock); 1971 if (flags & ZIO_FLAG_SCRUB_THREAD) 1972 vs->vs_scrub_repaired += psize; 1973 else 1974 vs->vs_self_healed += psize; 1975 mutex_exit(&vd->vdev_stat_lock); 1976 } 1977 return; 1978 } 1979 1980 if (flags & ZIO_FLAG_SPECULATIVE) 1981 return; 1982 1983 mutex_enter(&vd->vdev_stat_lock); 1984 if (type == ZIO_TYPE_READ) { 1985 if (zio->io_error == ECKSUM) 1986 vs->vs_checksum_errors++; 1987 else 1988 vs->vs_read_errors++; 1989 } 1990 if (type == ZIO_TYPE_WRITE) 1991 vs->vs_write_errors++; 1992 mutex_exit(&vd->vdev_stat_lock); 1993 1994 if (type == ZIO_TYPE_WRITE && txg != 0 && vd->vdev_children == 0) { 1995 if (flags & ZIO_FLAG_SCRUB_THREAD) { 1996 ASSERT(flags & ZIO_FLAG_IO_REPAIR); 1997 for (pvd = vd; pvd != NULL; pvd = pvd->vdev_parent) 1998 vdev_dtl_dirty(&pvd->vdev_dtl_scrub, txg, 1); 1999 } 2000 if (!(flags & ZIO_FLAG_IO_REPAIR)) { 2001 if (vdev_dtl_contains(&vd->vdev_dtl_map, txg, 1)) 2002 return; 2003 vdev_dirty(vd->vdev_top, VDD_DTL, vd, txg); 2004 for (pvd = vd; pvd != NULL; pvd = pvd->vdev_parent) 2005 vdev_dtl_dirty(&pvd->vdev_dtl_map, txg, 1); 2006 } 2007 } 2008} 2009 2010void 2011vdev_scrub_stat_update(vdev_t *vd, pool_scrub_type_t type, boolean_t complete) 2012{ 2013 int c; 2014 vdev_stat_t *vs = &vd->vdev_stat; 2015 2016 for (c = 0; c < vd->vdev_children; c++) 2017 vdev_scrub_stat_update(vd->vdev_child[c], type, complete); 2018 2019 mutex_enter(&vd->vdev_stat_lock); 2020 2021 if (type == POOL_SCRUB_NONE) { 2022 /* 2023 * Update completion and end time. Leave everything else alone 2024 * so we can report what happened during the previous scrub. 2025 */ 2026 vs->vs_scrub_complete = complete; 2027 vs->vs_scrub_end = gethrestime_sec(); 2028 } else { 2029 vs->vs_scrub_type = type; 2030 vs->vs_scrub_complete = 0; 2031 vs->vs_scrub_examined = 0; 2032 vs->vs_scrub_repaired = 0; 2033 vs->vs_scrub_start = gethrestime_sec(); 2034 vs->vs_scrub_end = 0; 2035 } 2036 2037 mutex_exit(&vd->vdev_stat_lock); 2038} 2039 2040/* 2041 * Update the in-core space usage stats for this vdev and the root vdev. 2042 */ 2043void 2044vdev_space_update(vdev_t *vd, int64_t space_delta, int64_t alloc_delta, 2045 boolean_t update_root) 2046{ 2047 int64_t dspace_delta = space_delta; 2048 spa_t *spa = vd->vdev_spa; 2049 vdev_t *rvd = spa->spa_root_vdev; 2050 2051 ASSERT(vd == vd->vdev_top); 2052 2053 /* 2054 * Apply the inverse of the psize-to-asize (ie. RAID-Z) space-expansion 2055 * factor. We must calculate this here and not at the root vdev 2056 * because the root vdev's psize-to-asize is simply the max of its 2057 * childrens', thus not accurate enough for us. 2058 */ 2059 ASSERT((dspace_delta & (SPA_MINBLOCKSIZE-1)) == 0); 2060 dspace_delta = (dspace_delta >> SPA_MINBLOCKSHIFT) * 2061 vd->vdev_deflate_ratio; 2062 2063 mutex_enter(&vd->vdev_stat_lock); 2064 vd->vdev_stat.vs_space += space_delta; 2065 vd->vdev_stat.vs_alloc += alloc_delta; 2066 vd->vdev_stat.vs_dspace += dspace_delta; 2067 mutex_exit(&vd->vdev_stat_lock); 2068 2069 if (update_root) { 2070 ASSERT(rvd == vd->vdev_parent); 2071 ASSERT(vd->vdev_ms_count != 0); 2072 2073 /* 2074 * Don't count non-normal (e.g. intent log) space as part of 2075 * the pool's capacity. 2076 */ 2077 if (vd->vdev_mg->mg_class != spa->spa_normal_class) 2078 return; 2079 2080 mutex_enter(&rvd->vdev_stat_lock); 2081 rvd->vdev_stat.vs_space += space_delta; 2082 rvd->vdev_stat.vs_alloc += alloc_delta; 2083 rvd->vdev_stat.vs_dspace += dspace_delta; 2084 mutex_exit(&rvd->vdev_stat_lock); 2085 } 2086} 2087 2088/* 2089 * Mark a top-level vdev's config as dirty, placing it on the dirty list 2090 * so that it will be written out next time the vdev configuration is synced. 2091 * If the root vdev is specified (vdev_top == NULL), dirty all top-level vdevs. 2092 */ 2093void 2094vdev_config_dirty(vdev_t *vd) 2095{ 2096 spa_t *spa = vd->vdev_spa; 2097 vdev_t *rvd = spa->spa_root_vdev; 2098 int c; 2099 2100 /* 2101 * If this is an aux vdev (as with l2cache devices), then we update the 2102 * vdev config manually and set the sync flag. 2103 */ 2104 if (vd->vdev_aux != NULL) { 2105 spa_aux_vdev_t *sav = vd->vdev_aux; 2106 nvlist_t **aux; 2107 uint_t naux; 2108 2109 for (c = 0; c < sav->sav_count; c++) { 2110 if (sav->sav_vdevs[c] == vd) 2111 break; 2112 } 2113 2114 if (c == sav->sav_count) { 2115 /* 2116 * We're being removed. There's nothing more to do. 2117 */ 2118 ASSERT(sav->sav_sync == B_TRUE); 2119 return; 2120 } 2121 2122 sav->sav_sync = B_TRUE; 2123 2124 VERIFY(nvlist_lookup_nvlist_array(sav->sav_config, 2125 ZPOOL_CONFIG_L2CACHE, &aux, &naux) == 0); 2126 2127 ASSERT(c < naux); 2128 2129 /* 2130 * Setting the nvlist in the middle if the array is a little 2131 * sketchy, but it will work. 2132 */ 2133 nvlist_free(aux[c]); 2134 aux[c] = vdev_config_generate(spa, vd, B_TRUE, B_FALSE, B_TRUE); 2135 2136 return; 2137 } 2138 2139 /* 2140 * The dirty list is protected by the SCL_CONFIG lock. The caller 2141 * must either hold SCL_CONFIG as writer, or must be the sync thread 2142 * (which holds SCL_CONFIG as reader). There's only one sync thread, 2143 * so this is sufficient to ensure mutual exclusion. 2144 */ 2145 ASSERT(spa_config_held(spa, SCL_CONFIG, RW_WRITER) || 2146 (dsl_pool_sync_context(spa_get_dsl(spa)) && 2147 spa_config_held(spa, SCL_CONFIG, RW_READER))); 2148 2149 if (vd == rvd) { 2150 for (c = 0; c < rvd->vdev_children; c++) 2151 vdev_config_dirty(rvd->vdev_child[c]); 2152 } else { 2153 ASSERT(vd == vd->vdev_top); 2154 2155 if (!list_link_active(&vd->vdev_config_dirty_node)) 2156 list_insert_head(&spa->spa_config_dirty_list, vd); 2157 } 2158} 2159 2160void 2161vdev_config_clean(vdev_t *vd) 2162{ 2163 spa_t *spa = vd->vdev_spa; 2164 2165 ASSERT(spa_config_held(spa, SCL_CONFIG, RW_WRITER) || 2166 (dsl_pool_sync_context(spa_get_dsl(spa)) && 2167 spa_config_held(spa, SCL_CONFIG, RW_READER))); 2168 2169 ASSERT(list_link_active(&vd->vdev_config_dirty_node)); 2170 list_remove(&spa->spa_config_dirty_list, vd); 2171} 2172 2173/* 2174 * Mark a top-level vdev's state as dirty, so that the next pass of 2175 * spa_sync() can convert this into vdev_config_dirty(). We distinguish 2176 * the state changes from larger config changes because they require 2177 * much less locking, and are often needed for administrative actions. 2178 */ 2179void 2180vdev_state_dirty(vdev_t *vd) 2181{ 2182 spa_t *spa = vd->vdev_spa; 2183 2184 ASSERT(vd == vd->vdev_top); 2185 2186 /* 2187 * The state list is protected by the SCL_STATE lock. The caller 2188 * must either hold SCL_STATE as writer, or must be the sync thread 2189 * (which holds SCL_STATE as reader). There's only one sync thread, 2190 * so this is sufficient to ensure mutual exclusion. 2191 */ 2192 ASSERT(spa_config_held(spa, SCL_STATE, RW_WRITER) || 2193 (dsl_pool_sync_context(spa_get_dsl(spa)) && 2194 spa_config_held(spa, SCL_STATE, RW_READER))); 2195 2196 if (!list_link_active(&vd->vdev_state_dirty_node)) 2197 list_insert_head(&spa->spa_state_dirty_list, vd); 2198} 2199 2200void 2201vdev_state_clean(vdev_t *vd) 2202{ 2203 spa_t *spa = vd->vdev_spa; 2204 2205 ASSERT(spa_config_held(spa, SCL_STATE, RW_WRITER) || 2206 (dsl_pool_sync_context(spa_get_dsl(spa)) && 2207 spa_config_held(spa, SCL_STATE, RW_READER))); 2208 2209 ASSERT(list_link_active(&vd->vdev_state_dirty_node)); 2210 list_remove(&spa->spa_state_dirty_list, vd); 2211} 2212 2213/* 2214 * Propagate vdev state up from children to parent. 2215 */ 2216void 2217vdev_propagate_state(vdev_t *vd) 2218{ 2219 vdev_t *rvd = vd->vdev_spa->spa_root_vdev; 2220 int degraded = 0, faulted = 0; 2221 int corrupted = 0; 2222 int c; 2223 vdev_t *child; 2224 2225 if (vd->vdev_children > 0) { 2226 for (c = 0; c < vd->vdev_children; c++) { 2227 child = vd->vdev_child[c]; 2228 2229 if (!vdev_readable(child) || 2230 (!vdev_writeable(child) && (spa_mode & FWRITE))) { 2231 /* 2232 * Root special: if there is a top-level log 2233 * device, treat the root vdev as if it were 2234 * degraded. 2235 */ 2236 if (child->vdev_islog && vd == rvd) 2237 degraded++; 2238 else 2239 faulted++; 2240 } else if (child->vdev_state <= VDEV_STATE_DEGRADED) { 2241 degraded++; 2242 } 2243 2244 if (child->vdev_stat.vs_aux == VDEV_AUX_CORRUPT_DATA) 2245 corrupted++; 2246 } 2247 2248 vd->vdev_ops->vdev_op_state_change(vd, faulted, degraded); 2249 2250 /* 2251 * Root special: if there is a top-level vdev that cannot be 2252 * opened due to corrupted metadata, then propagate the root 2253 * vdev's aux state as 'corrupt' rather than 'insufficient 2254 * replicas'. 2255 */ 2256 if (corrupted && vd == rvd && 2257 rvd->vdev_state == VDEV_STATE_CANT_OPEN) 2258 vdev_set_state(rvd, B_FALSE, VDEV_STATE_CANT_OPEN, 2259 VDEV_AUX_CORRUPT_DATA); 2260 } 2261 2262 if (vd->vdev_parent) 2263 vdev_propagate_state(vd->vdev_parent); 2264} 2265 2266/* 2267 * Set a vdev's state. If this is during an open, we don't update the parent 2268 * state, because we're in the process of opening children depth-first. 2269 * Otherwise, we propagate the change to the parent. 2270 * 2271 * If this routine places a device in a faulted state, an appropriate ereport is 2272 * generated. 2273 */ 2274void 2275vdev_set_state(vdev_t *vd, boolean_t isopen, vdev_state_t state, vdev_aux_t aux) 2276{ 2277 uint64_t save_state; 2278 spa_t *spa = vd->vdev_spa; 2279 2280 if (state == vd->vdev_state) { 2281 vd->vdev_stat.vs_aux = aux; 2282 return; 2283 } 2284 2285 save_state = vd->vdev_state; 2286 2287 vd->vdev_state = state; 2288 vd->vdev_stat.vs_aux = aux; 2289 2290 /* 2291 * If we are setting the vdev state to anything but an open state, then 2292 * always close the underlying device. Otherwise, we keep accessible 2293 * but invalid devices open forever. We don't call vdev_close() itself, 2294 * because that implies some extra checks (offline, etc) that we don't 2295 * want here. This is limited to leaf devices, because otherwise 2296 * closing the device will affect other children. 2297 */ 2298 if (vdev_is_dead(vd) && vd->vdev_ops->vdev_op_leaf) 2299 vd->vdev_ops->vdev_op_close(vd); 2300 2301 if (vd->vdev_removed && 2302 state == VDEV_STATE_CANT_OPEN && 2303 (aux == VDEV_AUX_OPEN_FAILED || vd->vdev_checkremove)) { 2304 /* 2305 * If the previous state is set to VDEV_STATE_REMOVED, then this 2306 * device was previously marked removed and someone attempted to 2307 * reopen it. If this failed due to a nonexistent device, then 2308 * keep the device in the REMOVED state. We also let this be if 2309 * it is one of our special test online cases, which is only 2310 * attempting to online the device and shouldn't generate an FMA 2311 * fault. 2312 */ 2313 vd->vdev_state = VDEV_STATE_REMOVED; 2314 vd->vdev_stat.vs_aux = VDEV_AUX_NONE; 2315 } else if (state == VDEV_STATE_REMOVED) { 2316 /* 2317 * Indicate to the ZFS DE that this device has been removed, and 2318 * any recent errors should be ignored. 2319 */ 2320 zfs_post_remove(spa, vd); 2321 vd->vdev_removed = B_TRUE; 2322 } else if (state == VDEV_STATE_CANT_OPEN) { 2323 /* 2324 * If we fail to open a vdev during an import, we mark it as 2325 * "not available", which signifies that it was never there to 2326 * begin with. Failure to open such a device is not considered 2327 * an error. 2328 */ 2329 if (spa->spa_load_state == SPA_LOAD_IMPORT && 2330 !spa->spa_import_faulted && 2331 vd->vdev_ops->vdev_op_leaf) 2332 vd->vdev_not_present = 1; 2333 2334 /* 2335 * Post the appropriate ereport. If the 'prevstate' field is 2336 * set to something other than VDEV_STATE_UNKNOWN, it indicates 2337 * that this is part of a vdev_reopen(). In this case, we don't 2338 * want to post the ereport if the device was already in the 2339 * CANT_OPEN state beforehand. 2340 * 2341 * If the 'checkremove' flag is set, then this is an attempt to 2342 * online the device in response to an insertion event. If we 2343 * hit this case, then we have detected an insertion event for a 2344 * faulted or offline device that wasn't in the removed state. 2345 * In this scenario, we don't post an ereport because we are 2346 * about to replace the device, or attempt an online with 2347 * vdev_forcefault, which will generate the fault for us. 2348 */ 2349 if ((vd->vdev_prevstate != state || vd->vdev_forcefault) && 2350 !vd->vdev_not_present && !vd->vdev_checkremove && 2351 vd != spa->spa_root_vdev) { 2352 const char *class; 2353 2354 switch (aux) { 2355 case VDEV_AUX_OPEN_FAILED: 2356 class = FM_EREPORT_ZFS_DEVICE_OPEN_FAILED; 2357 break; 2358 case VDEV_AUX_CORRUPT_DATA: 2359 class = FM_EREPORT_ZFS_DEVICE_CORRUPT_DATA; 2360 break; 2361 case VDEV_AUX_NO_REPLICAS: 2362 class = FM_EREPORT_ZFS_DEVICE_NO_REPLICAS; 2363 break; 2364 case VDEV_AUX_BAD_GUID_SUM: 2365 class = FM_EREPORT_ZFS_DEVICE_BAD_GUID_SUM; 2366 break; 2367 case VDEV_AUX_TOO_SMALL: 2368 class = FM_EREPORT_ZFS_DEVICE_TOO_SMALL; 2369 break; 2370 case VDEV_AUX_BAD_LABEL: 2371 class = FM_EREPORT_ZFS_DEVICE_BAD_LABEL; 2372 break; 2373 case VDEV_AUX_IO_FAILURE: 2374 class = FM_EREPORT_ZFS_IO_FAILURE; 2375 break; 2376 default: 2377 class = FM_EREPORT_ZFS_DEVICE_UNKNOWN; 2378 } 2379 2380 zfs_ereport_post(class, spa, vd, NULL, save_state, 0); 2381 } 2382 2383 /* Erase any notion of persistent removed state */ 2384 vd->vdev_removed = B_FALSE; 2385 } else { 2386 vd->vdev_removed = B_FALSE; 2387 } 2388 2389 if (!isopen) 2390 vdev_propagate_state(vd); 2391} 2392 2393/* 2394 * Check the vdev configuration to ensure that it's capable of supporting 2395 * a root pool. 2396 * 2397 * On Solaris, we do not support RAID-Z or partial configuration. In 2398 * addition, only a single top-level vdev is allowed and none of the 2399 * leaves can be wholedisks. 2400 * 2401 * For FreeBSD, we can boot from any configuration. There is a 2402 * limitation that the boot filesystem must be either uncompressed or 2403 * compresses with lzjb compression but I'm not sure how to enforce 2404 * that here. 2405 */ 2406boolean_t 2407vdev_is_bootable(vdev_t *vd) 2408{ 2409#ifdef __FreeBSD_version 2410 return (B_TRUE); 2411#else 2412 int c; 2413 2414 if (!vd->vdev_ops->vdev_op_leaf) { 2415 char *vdev_type = vd->vdev_ops->vdev_op_type; 2416 2417 if (strcmp(vdev_type, VDEV_TYPE_ROOT) == 0 && 2418 vd->vdev_children > 1) { 2419 return (B_FALSE); 2420 } else if (strcmp(vdev_type, VDEV_TYPE_RAIDZ) == 0 || 2421 strcmp(vdev_type, VDEV_TYPE_MISSING) == 0) { 2422 return (B_FALSE); 2423 } 2424 } else if (vd->vdev_wholedisk == 1) { 2425 return (B_FALSE); 2426 } 2427 2428 for (c = 0; c < vd->vdev_children; c++) { 2429 if (!vdev_is_bootable(vd->vdev_child[c])) 2430 return (B_FALSE); 2431 } 2432 return (B_TRUE); 2433#endif 2434} 2435