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sys/contrib/openzfs/cmd/zed/agents/zfs_diagnosis.c
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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 https://opensource.org/licenses/CDDL-1.0. 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 (c) 2010, Oracle and/or its affiliates. All rights reserved. 24 * Copyright 2015 Nexenta Systems, Inc. All rights reserved. 25 * Copyright (c) 2016, Intel Corporation. 26 */ 27 28 #include <stddef.h> 29 #include <string.h> 30 #include <libuutil.h> 31 #include <libzfs.h> 32 #include <sys/types.h> 33 #include <sys/time.h> 34 #include <sys/fs/zfs.h> 35 #include <sys/fm/protocol.h> 36 #include <sys/fm/fs/zfs.h> 37 #include <sys/zio.h> 38 39 #include "zfs_agents.h" 40 #include "fmd_api.h" 41 42 /* 43 * Default values for the serd engine when processing checksum or io errors. The 44 * semantics are N <events> in T <seconds>. 45 */ 46 #define DEFAULT_CHECKSUM_N 10 /* events */ 47 #define DEFAULT_CHECKSUM_T 600 /* seconds */ 48 #define DEFAULT_IO_N 10 /* events */ 49 #define DEFAULT_IO_T 600 /* seconds */ 50 51 /* 52 * Our serd engines are named 'zfs_<pool_guid>_<vdev_guid>_{checksum,io}'. This 53 * #define reserves enough space for two 64-bit hex values plus the length of 54 * the longest string. 55 */ 56 #define MAX_SERDLEN (16 * 2 + sizeof ("zfs___checksum")) 57 58 /* 59 * On-disk case structure. This must maintain backwards compatibility with 60 * previous versions of the DE. By default, any members appended to the end 61 * will be filled with zeros if they don't exist in a previous version. 62 */ 63 typedef struct zfs_case_data { 64 uint64_t zc_version; 65 uint64_t zc_ena; 66 uint64_t zc_pool_guid; 67 uint64_t zc_vdev_guid; 68 int zc_pool_state; 69 char zc_serd_checksum[MAX_SERDLEN]; 70 char zc_serd_io[MAX_SERDLEN]; 71 int zc_has_remove_timer; 72 } zfs_case_data_t; 73 74 /* 75 * Time-of-day 76 */ 77 typedef struct er_timeval { 78 uint64_t ertv_sec; 79 uint64_t ertv_nsec; 80 } er_timeval_t; 81 82 /* 83 * In-core case structure. 84 */ 85 typedef struct zfs_case { 86 boolean_t zc_present; 87 uint32_t zc_version; 88 zfs_case_data_t zc_data; 89 fmd_case_t *zc_case; 90 uu_list_node_t zc_node; 91 id_t zc_remove_timer; 92 char *zc_fru; 93 er_timeval_t zc_when; 94 } zfs_case_t; 95 96 #define CASE_DATA "data" 97 #define CASE_FRU "fru" 98 #define CASE_DATA_VERSION_INITIAL 1 99 #define CASE_DATA_VERSION_SERD 2 100 101 typedef struct zfs_de_stats { 102 fmd_stat_t old_drops; 103 fmd_stat_t dev_drops; 104 fmd_stat_t vdev_drops; 105 fmd_stat_t import_drops; 106 fmd_stat_t resource_drops; 107 } zfs_de_stats_t; 108 109 zfs_de_stats_t zfs_stats = { 110 { "old_drops", FMD_TYPE_UINT64, "ereports dropped (from before load)" }, 111 { "dev_drops", FMD_TYPE_UINT64, "ereports dropped (dev during open)"}, 112 { "vdev_drops", FMD_TYPE_UINT64, "ereports dropped (weird vdev types)"}, 113 { "import_drops", FMD_TYPE_UINT64, "ereports dropped (during import)" }, 114 { "resource_drops", FMD_TYPE_UINT64, "resource related ereports" } 115 }; 116 117 static hrtime_t zfs_remove_timeout; 118 119 uu_list_pool_t *zfs_case_pool; 120 uu_list_t *zfs_cases; 121 122 #define ZFS_MAKE_RSRC(type) \ 123 FM_RSRC_CLASS "." ZFS_ERROR_CLASS "." type 124 #define ZFS_MAKE_EREPORT(type) \ 125 FM_EREPORT_CLASS "." ZFS_ERROR_CLASS "." type 126 127 /* 128 * Write out the persistent representation of an active case. 129 */ 130 static void 131 zfs_case_serialize(zfs_case_t *zcp) 132 { 133 zcp->zc_data.zc_version = CASE_DATA_VERSION_SERD; 134 } 135 136 /* 137 * Read back the persistent representation of an active case. 138 */ 139 static zfs_case_t * 140 zfs_case_unserialize(fmd_hdl_t *hdl, fmd_case_t *cp) 141 { 142 zfs_case_t *zcp; 143 144 zcp = fmd_hdl_zalloc(hdl, sizeof (zfs_case_t), FMD_SLEEP); 145 zcp->zc_case = cp; 146 147 fmd_buf_read(hdl, cp, CASE_DATA, &zcp->zc_data, 148 sizeof (zcp->zc_data)); 149 150 if (zcp->zc_data.zc_version > CASE_DATA_VERSION_SERD) { 151 fmd_hdl_free(hdl, zcp, sizeof (zfs_case_t)); 152 return (NULL); 153 } 154 155 /* 156 * fmd_buf_read() will have already zeroed out the remainder of the 157 * buffer, so we don't have to do anything special if the version 158 * doesn't include the SERD engine name. 159 */ 160 161 if (zcp->zc_data.zc_has_remove_timer) 162 zcp->zc_remove_timer = fmd_timer_install(hdl, zcp, 163 NULL, zfs_remove_timeout); 164 165 uu_list_node_init(zcp, &zcp->zc_node, zfs_case_pool); 166 (void) uu_list_insert_before(zfs_cases, NULL, zcp); 167 168 fmd_case_setspecific(hdl, cp, zcp); 169 170 return (zcp); 171 } 172 173 /* 174 * Iterate over any active cases. If any cases are associated with a pool or 175 * vdev which is no longer present on the system, close the associated case. 176 */ 177 static void 178 zfs_mark_vdev(uint64_t pool_guid, nvlist_t *vd, er_timeval_t *loaded) 179 { 180 uint64_t vdev_guid = 0; 181 uint_t c, children; 182 nvlist_t **child; 183 zfs_case_t *zcp; 184 185 (void) nvlist_lookup_uint64(vd, ZPOOL_CONFIG_GUID, &vdev_guid); 186 187 /* 188 * Mark any cases associated with this (pool, vdev) pair. 189 */ 190 for (zcp = uu_list_first(zfs_cases); zcp != NULL; 191 zcp = uu_list_next(zfs_cases, zcp)) { 192 if (zcp->zc_data.zc_pool_guid == pool_guid && 193 zcp->zc_data.zc_vdev_guid == vdev_guid) { 194 zcp->zc_present = B_TRUE; 195 zcp->zc_when = *loaded; 196 } 197 } 198 199 /* 200 * Iterate over all children. 201 */ 202 if (nvlist_lookup_nvlist_array(vd, ZPOOL_CONFIG_CHILDREN, &child, 203 &children) == 0) { 204 for (c = 0; c < children; c++) 205 zfs_mark_vdev(pool_guid, child[c], loaded); 206 } 207 208 if (nvlist_lookup_nvlist_array(vd, ZPOOL_CONFIG_L2CACHE, &child, 209 &children) == 0) { 210 for (c = 0; c < children; c++) 211 zfs_mark_vdev(pool_guid, child[c], loaded); 212 } 213 214 if (nvlist_lookup_nvlist_array(vd, ZPOOL_CONFIG_SPARES, &child, 215 &children) == 0) { 216 for (c = 0; c < children; c++) 217 zfs_mark_vdev(pool_guid, child[c], loaded); 218 } 219 } 220 221 static int 222 zfs_mark_pool(zpool_handle_t *zhp, void *unused) 223 { 224 (void) unused; 225 zfs_case_t *zcp; 226 uint64_t pool_guid; 227 uint64_t *tod; 228 er_timeval_t loaded = { 0 }; 229 nvlist_t *config, *vd; 230 uint_t nelem = 0; 231 int ret; 232 233 pool_guid = zpool_get_prop_int(zhp, ZPOOL_PROP_GUID, NULL); 234 /* 235 * Mark any cases associated with just this pool. 236 */ 237 for (zcp = uu_list_first(zfs_cases); zcp != NULL; 238 zcp = uu_list_next(zfs_cases, zcp)) { 239 if (zcp->zc_data.zc_pool_guid == pool_guid && 240 zcp->zc_data.zc_vdev_guid == 0) 241 zcp->zc_present = B_TRUE; 242 } 243 244 if ((config = zpool_get_config(zhp, NULL)) == NULL) { 245 zpool_close(zhp); 246 return (-1); 247 } 248 249 (void) nvlist_lookup_uint64_array(config, ZPOOL_CONFIG_LOADED_TIME, 250 &tod, &nelem); 251 if (nelem == 2) { 252 loaded.ertv_sec = tod[0]; 253 loaded.ertv_nsec = tod[1]; 254 for (zcp = uu_list_first(zfs_cases); zcp != NULL; 255 zcp = uu_list_next(zfs_cases, zcp)) { 256 if (zcp->zc_data.zc_pool_guid == pool_guid && 257 zcp->zc_data.zc_vdev_guid == 0) { 258 zcp->zc_when = loaded; 259 } 260 } 261 } 262 263 ret = nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, &vd); 264 if (ret) { 265 zpool_close(zhp); 266 return (-1); 267 } 268 269 zfs_mark_vdev(pool_guid, vd, &loaded); 270 271 zpool_close(zhp); 272 273 return (0); 274 } 275 276 struct load_time_arg { 277 uint64_t lt_guid; 278 er_timeval_t *lt_time; 279 boolean_t lt_found; 280 }; 281 282 static int 283 zpool_find_load_time(zpool_handle_t *zhp, void *arg) 284 { 285 struct load_time_arg *lta = arg; 286 uint64_t pool_guid; 287 uint64_t *tod; 288 nvlist_t *config; 289 uint_t nelem; 290 291 if (lta->lt_found) { 292 zpool_close(zhp); 293 return (0); 294 } 295 296 pool_guid = zpool_get_prop_int(zhp, ZPOOL_PROP_GUID, NULL); 297 if (pool_guid != lta->lt_guid) { 298 zpool_close(zhp); 299 return (0); 300 } 301 302 if ((config = zpool_get_config(zhp, NULL)) == NULL) { 303 zpool_close(zhp); 304 return (-1); 305 } 306 307 if (nvlist_lookup_uint64_array(config, ZPOOL_CONFIG_LOADED_TIME, 308 &tod, &nelem) == 0 && nelem == 2) { 309 lta->lt_found = B_TRUE; 310 lta->lt_time->ertv_sec = tod[0]; 311 lta->lt_time->ertv_nsec = tod[1]; 312 } 313 314 zpool_close(zhp); 315 316 return (0); 317 } 318 319 static void 320 zfs_purge_cases(fmd_hdl_t *hdl) 321 { 322 zfs_case_t *zcp; 323 uu_list_walk_t *walk; 324 libzfs_handle_t *zhdl = fmd_hdl_getspecific(hdl); 325 326 /* 327 * There is no way to open a pool by GUID, or lookup a vdev by GUID. No 328 * matter what we do, we're going to have to stomach an O(vdevs * cases) 329 * algorithm. In reality, both quantities are likely so small that 330 * neither will matter. Given that iterating over pools is more 331 * expensive than iterating over the in-memory case list, we opt for a 332 * 'present' flag in each case that starts off cleared. We then iterate 333 * over all pools, marking those that are still present, and removing 334 * those that aren't found. 335 * 336 * Note that we could also construct an FMRI and rely on 337 * fmd_nvl_fmri_present(), but this would end up doing the same search. 338 */ 339 340 /* 341 * Mark the cases as not present. 342 */ 343 for (zcp = uu_list_first(zfs_cases); zcp != NULL; 344 zcp = uu_list_next(zfs_cases, zcp)) 345 zcp->zc_present = B_FALSE; 346 347 /* 348 * Iterate over all pools and mark the pools and vdevs found. If this 349 * fails (most probably because we're out of memory), then don't close 350 * any of the cases and we cannot be sure they are accurate. 351 */ 352 if (zpool_iter(zhdl, zfs_mark_pool, NULL) != 0) 353 return; 354 355 /* 356 * Remove those cases which were not found. 357 */ 358 walk = uu_list_walk_start(zfs_cases, UU_WALK_ROBUST); 359 while ((zcp = uu_list_walk_next(walk)) != NULL) { 360 if (!zcp->zc_present) 361 fmd_case_close(hdl, zcp->zc_case); 362 } 363 uu_list_walk_end(walk); 364 } 365 366 /* 367 * Construct the name of a serd engine given the pool/vdev GUID and type (io or 368 * checksum). 369 */ 370 static void 371 zfs_serd_name(char *buf, uint64_t pool_guid, uint64_t vdev_guid, 372 const char *type) 373 { 374 (void) snprintf(buf, MAX_SERDLEN, "zfs_%llx_%llx_%s", 375 (long long unsigned int)pool_guid, 376 (long long unsigned int)vdev_guid, type); 377 } 378 379 /* 380 * Solve a given ZFS case. This first checks to make sure the diagnosis is 381 * still valid, as well as cleaning up any pending timer associated with the 382 * case. 383 */ 384 static void 385 zfs_case_solve(fmd_hdl_t *hdl, zfs_case_t *zcp, const char *faultname) 386 { 387 nvlist_t *detector, *fault; 388 boolean_t serialize; 389 nvlist_t *fru = NULL; 390 fmd_hdl_debug(hdl, "solving fault '%s'", faultname); 391 392 /* 393 * Construct the detector from the case data. The detector is in the 394 * ZFS scheme, and is either the pool or the vdev, depending on whether 395 * this is a vdev or pool fault. 396 */ 397 detector = fmd_nvl_alloc(hdl, FMD_SLEEP); 398 399 (void) nvlist_add_uint8(detector, FM_VERSION, ZFS_SCHEME_VERSION0); 400 (void) nvlist_add_string(detector, FM_FMRI_SCHEME, FM_FMRI_SCHEME_ZFS); 401 (void) nvlist_add_uint64(detector, FM_FMRI_ZFS_POOL, 402 zcp->zc_data.zc_pool_guid); 403 if (zcp->zc_data.zc_vdev_guid != 0) { 404 (void) nvlist_add_uint64(detector, FM_FMRI_ZFS_VDEV, 405 zcp->zc_data.zc_vdev_guid); 406 } 407 408 fault = fmd_nvl_create_fault(hdl, faultname, 100, detector, 409 fru, detector); 410 fmd_case_add_suspect(hdl, zcp->zc_case, fault); 411 412 nvlist_free(fru); 413 414 fmd_case_solve(hdl, zcp->zc_case); 415 416 serialize = B_FALSE; 417 if (zcp->zc_data.zc_has_remove_timer) { 418 fmd_timer_remove(hdl, zcp->zc_remove_timer); 419 zcp->zc_data.zc_has_remove_timer = 0; 420 serialize = B_TRUE; 421 } 422 if (serialize) 423 zfs_case_serialize(zcp); 424 425 nvlist_free(detector); 426 } 427 428 static boolean_t 429 timeval_earlier(er_timeval_t *a, er_timeval_t *b) 430 { 431 return (a->ertv_sec < b->ertv_sec || 432 (a->ertv_sec == b->ertv_sec && a->ertv_nsec < b->ertv_nsec)); 433 } 434 435 static void 436 zfs_ereport_when(fmd_hdl_t *hdl, nvlist_t *nvl, er_timeval_t *when) 437 { 438 (void) hdl; 439 int64_t *tod; 440 uint_t nelem; 441 442 if (nvlist_lookup_int64_array(nvl, FM_EREPORT_TIME, &tod, 443 &nelem) == 0 && nelem == 2) { 444 when->ertv_sec = tod[0]; 445 when->ertv_nsec = tod[1]; 446 } else { 447 when->ertv_sec = when->ertv_nsec = UINT64_MAX; 448 } 449 } 450 451 /* 452 * Main fmd entry point. 453 */ 454 static void 455 zfs_fm_recv(fmd_hdl_t *hdl, fmd_event_t *ep, nvlist_t *nvl, const char *class) 456 { 457 zfs_case_t *zcp, *dcp; 458 int32_t pool_state; 459 uint64_t ena, pool_guid, vdev_guid; 460 uint64_t checksum_n, checksum_t; 461 uint64_t io_n, io_t; 462 er_timeval_t pool_load; 463 er_timeval_t er_when; 464 nvlist_t *detector; 465 boolean_t pool_found = B_FALSE; 466 boolean_t isresource; 467 char *type; 468 469 /* 470 * We subscribe to notifications for vdev or pool removal. In these 471 * cases, there may be cases that no longer apply. Purge any cases 472 * that no longer apply. 473 */ 474 if (fmd_nvl_class_match(hdl, nvl, "sysevent.fs.zfs.*")) { 475 fmd_hdl_debug(hdl, "purging orphaned cases from %s", 476 strrchr(class, '.') + 1); 477 zfs_purge_cases(hdl); 478 zfs_stats.resource_drops.fmds_value.ui64++; 479 return; 480 } 481 482 isresource = fmd_nvl_class_match(hdl, nvl, "resource.fs.zfs.*"); 483 484 if (isresource) { 485 /* 486 * For resources, we don't have a normal payload. 487 */ 488 if (nvlist_lookup_uint64(nvl, FM_EREPORT_PAYLOAD_ZFS_VDEV_GUID, 489 &vdev_guid) != 0) 490 pool_state = SPA_LOAD_OPEN; 491 else 492 pool_state = SPA_LOAD_NONE; 493 detector = NULL; 494 } else { 495 (void) nvlist_lookup_nvlist(nvl, 496 FM_EREPORT_DETECTOR, &detector); 497 (void) nvlist_lookup_int32(nvl, 498 FM_EREPORT_PAYLOAD_ZFS_POOL_CONTEXT, &pool_state); 499 } 500 501 /* 502 * We also ignore all ereports generated during an import of a pool, 503 * since the only possible fault (.pool) would result in import failure, 504 * and hence no persistent fault. Some day we may want to do something 505 * with these ereports, so we continue generating them internally. 506 */ 507 if (pool_state == SPA_LOAD_IMPORT) { 508 zfs_stats.import_drops.fmds_value.ui64++; 509 fmd_hdl_debug(hdl, "ignoring '%s' during import", class); 510 return; 511 } 512 513 /* 514 * Device I/O errors are ignored during pool open. 515 */ 516 if (pool_state == SPA_LOAD_OPEN && 517 (fmd_nvl_class_match(hdl, nvl, 518 ZFS_MAKE_EREPORT(FM_EREPORT_ZFS_CHECKSUM)) || 519 fmd_nvl_class_match(hdl, nvl, 520 ZFS_MAKE_EREPORT(FM_EREPORT_ZFS_IO)) || 521 fmd_nvl_class_match(hdl, nvl, 522 ZFS_MAKE_EREPORT(FM_EREPORT_ZFS_PROBE_FAILURE)))) { 523 fmd_hdl_debug(hdl, "ignoring '%s' during pool open", class); 524 zfs_stats.dev_drops.fmds_value.ui64++; 525 return; 526 } 527 528 /* 529 * We ignore ereports for anything except disks and files. 530 */ 531 if (nvlist_lookup_string(nvl, FM_EREPORT_PAYLOAD_ZFS_VDEV_TYPE, 532 &type) == 0) { 533 if (strcmp(type, VDEV_TYPE_DISK) != 0 && 534 strcmp(type, VDEV_TYPE_FILE) != 0) { 535 zfs_stats.vdev_drops.fmds_value.ui64++; 536 return; 537 } 538 } 539 540 /* 541 * Determine if this ereport corresponds to an open case. 542 * Each vdev or pool can have a single case. 543 */ 544 (void) nvlist_lookup_uint64(nvl, 545 FM_EREPORT_PAYLOAD_ZFS_POOL_GUID, &pool_guid); 546 if (nvlist_lookup_uint64(nvl, 547 FM_EREPORT_PAYLOAD_ZFS_VDEV_GUID, &vdev_guid) != 0) 548 vdev_guid = 0; 549 if (nvlist_lookup_uint64(nvl, FM_EREPORT_ENA, &ena) != 0) 550 ena = 0; 551 552 zfs_ereport_when(hdl, nvl, &er_when); 553 554 for (zcp = uu_list_first(zfs_cases); zcp != NULL; 555 zcp = uu_list_next(zfs_cases, zcp)) { 556 if (zcp->zc_data.zc_pool_guid == pool_guid) { 557 pool_found = B_TRUE; 558 pool_load = zcp->zc_when; 559 } 560 if (zcp->zc_data.zc_vdev_guid == vdev_guid) 561 break; 562 } 563 564 /* 565 * Avoid falsely accusing a pool of being faulty. Do so by 566 * not replaying ereports that were generated prior to the 567 * current import. If the failure that generated them was 568 * transient because the device was actually removed but we 569 * didn't receive the normal asynchronous notification, we 570 * don't want to mark it as faulted and potentially panic. If 571 * there is still a problem we'd expect not to be able to 572 * import the pool, or that new ereports will be generated 573 * once the pool is used. 574 */ 575 if (pool_found && timeval_earlier(&er_when, &pool_load)) { 576 fmd_hdl_debug(hdl, "ignoring pool %llx, " 577 "ereport time %lld.%lld, pool load time = %lld.%lld", 578 pool_guid, er_when.ertv_sec, er_when.ertv_nsec, 579 pool_load.ertv_sec, pool_load.ertv_nsec); 580 zfs_stats.old_drops.fmds_value.ui64++; 581 return; 582 } 583 584 if (!pool_found) { 585 /* 586 * Haven't yet seen this pool, but same situation 587 * may apply. 588 */ 589 libzfs_handle_t *zhdl = fmd_hdl_getspecific(hdl); 590 struct load_time_arg la; 591 592 la.lt_guid = pool_guid; 593 la.lt_time = &pool_load; 594 la.lt_found = B_FALSE; 595 596 if (zhdl != NULL && 597 zpool_iter(zhdl, zpool_find_load_time, &la) == 0 && 598 la.lt_found == B_TRUE) { 599 pool_found = B_TRUE; 600 601 if (timeval_earlier(&er_when, &pool_load)) { 602 fmd_hdl_debug(hdl, "ignoring pool %llx, " 603 "ereport time %lld.%lld, " 604 "pool load time = %lld.%lld", 605 pool_guid, er_when.ertv_sec, 606 er_when.ertv_nsec, pool_load.ertv_sec, 607 pool_load.ertv_nsec); 608 zfs_stats.old_drops.fmds_value.ui64++; 609 return; 610 } 611 } 612 } 613 614 if (zcp == NULL) { 615 fmd_case_t *cs; 616 zfs_case_data_t data = { 0 }; 617 618 /* 619 * If this is one of our 'fake' resource ereports, and there is 620 * no case open, simply discard it. 621 */ 622 if (isresource) { 623 zfs_stats.resource_drops.fmds_value.ui64++; 624 fmd_hdl_debug(hdl, "discarding '%s for vdev %llu", 625 class, vdev_guid); 626 return; 627 } 628 629 /* 630 * Skip tracking some ereports 631 */ 632 if (strcmp(class, 633 ZFS_MAKE_EREPORT(FM_EREPORT_ZFS_DATA)) == 0 || 634 strcmp(class, 635 ZFS_MAKE_EREPORT(FM_EREPORT_ZFS_CONFIG_CACHE_WRITE)) == 0 || 636 strcmp(class, 637 ZFS_MAKE_EREPORT(FM_EREPORT_ZFS_DELAY)) == 0) { 638 zfs_stats.resource_drops.fmds_value.ui64++; 639 return; 640 } 641 642 /* 643 * Open a new case. 644 */ 645 cs = fmd_case_open(hdl, NULL); 646 647 fmd_hdl_debug(hdl, "opening case for vdev %llu due to '%s'", 648 vdev_guid, class); 649 650 /* 651 * Initialize the case buffer. To commonize code, we actually 652 * create the buffer with existing data, and then call 653 * zfs_case_unserialize() to instantiate the in-core structure. 654 */ 655 fmd_buf_create(hdl, cs, CASE_DATA, sizeof (zfs_case_data_t)); 656 657 data.zc_version = CASE_DATA_VERSION_SERD; 658 data.zc_ena = ena; 659 data.zc_pool_guid = pool_guid; 660 data.zc_vdev_guid = vdev_guid; 661 data.zc_pool_state = (int)pool_state; 662 663 fmd_buf_write(hdl, cs, CASE_DATA, &data, sizeof (data)); 664 665 zcp = zfs_case_unserialize(hdl, cs); 666 assert(zcp != NULL); 667 if (pool_found) 668 zcp->zc_when = pool_load; 669 } 670 671 if (isresource) { 672 fmd_hdl_debug(hdl, "resource event '%s'", class); 673 674 if (fmd_nvl_class_match(hdl, nvl, 675 ZFS_MAKE_RSRC(FM_RESOURCE_AUTOREPLACE))) { 676 /* 677 * The 'resource.fs.zfs.autoreplace' event indicates 678 * that the pool was loaded with the 'autoreplace' 679 * property set. In this case, any pending device 680 * failures should be ignored, as the asynchronous 681 * autoreplace handling will take care of them. 682 */ 683 fmd_case_close(hdl, zcp->zc_case); 684 } else if (fmd_nvl_class_match(hdl, nvl, 685 ZFS_MAKE_RSRC(FM_RESOURCE_REMOVED))) { 686 /* 687 * The 'resource.fs.zfs.removed' event indicates that 688 * device removal was detected, and the device was 689 * closed asynchronously. If this is the case, we 690 * assume that any recent I/O errors were due to the 691 * device removal, not any fault of the device itself. 692 * We reset the SERD engine, and cancel any pending 693 * timers. 694 */ 695 if (zcp->zc_data.zc_has_remove_timer) { 696 fmd_timer_remove(hdl, zcp->zc_remove_timer); 697 zcp->zc_data.zc_has_remove_timer = 0; 698 zfs_case_serialize(zcp); 699 } 700 if (zcp->zc_data.zc_serd_io[0] != '\0') 701 fmd_serd_reset(hdl, zcp->zc_data.zc_serd_io); 702 if (zcp->zc_data.zc_serd_checksum[0] != '\0') 703 fmd_serd_reset(hdl, 704 zcp->zc_data.zc_serd_checksum); 705 } else if (fmd_nvl_class_match(hdl, nvl, 706 ZFS_MAKE_RSRC(FM_RESOURCE_STATECHANGE))) { 707 uint64_t state = 0; 708 709 if (zcp != NULL && 710 nvlist_lookup_uint64(nvl, 711 FM_EREPORT_PAYLOAD_ZFS_VDEV_STATE, &state) == 0 && 712 state == VDEV_STATE_HEALTHY) { 713 fmd_hdl_debug(hdl, "closing case after a " 714 "device statechange to healthy"); 715 fmd_case_close(hdl, zcp->zc_case); 716 } 717 } 718 zfs_stats.resource_drops.fmds_value.ui64++; 719 return; 720 } 721 722 /* 723 * Associate the ereport with this case. 724 */ 725 fmd_case_add_ereport(hdl, zcp->zc_case, ep); 726 727 /* 728 * Don't do anything else if this case is already solved. 729 */ 730 if (fmd_case_solved(hdl, zcp->zc_case)) 731 return; 732 733 fmd_hdl_debug(hdl, "error event '%s'", class); 734 735 /* 736 * Determine if we should solve the case and generate a fault. We solve 737 * a case if: 738 * 739 * a. A pool failed to open (ereport.fs.zfs.pool) 740 * b. A device failed to open (ereport.fs.zfs.pool) while a pool 741 * was up and running. 742 * 743 * We may see a series of ereports associated with a pool open, all 744 * chained together by the same ENA. If the pool open succeeds, then 745 * we'll see no further ereports. To detect when a pool open has 746 * succeeded, we associate a timer with the event. When it expires, we 747 * close the case. 748 */ 749 if (fmd_nvl_class_match(hdl, nvl, 750 ZFS_MAKE_EREPORT(FM_EREPORT_ZFS_POOL))) { 751 /* 752 * Pool level fault. Before solving the case, go through and 753 * close any open device cases that may be pending. 754 */ 755 for (dcp = uu_list_first(zfs_cases); dcp != NULL; 756 dcp = uu_list_next(zfs_cases, dcp)) { 757 if (dcp->zc_data.zc_pool_guid == 758 zcp->zc_data.zc_pool_guid && 759 dcp->zc_data.zc_vdev_guid != 0) 760 fmd_case_close(hdl, dcp->zc_case); 761 } 762 763 zfs_case_solve(hdl, zcp, "fault.fs.zfs.pool"); 764 } else if (fmd_nvl_class_match(hdl, nvl, 765 ZFS_MAKE_EREPORT(FM_EREPORT_ZFS_LOG_REPLAY))) { 766 /* 767 * Pool level fault for reading the intent logs. 768 */ 769 zfs_case_solve(hdl, zcp, "fault.fs.zfs.log_replay"); 770 } else if (fmd_nvl_class_match(hdl, nvl, "ereport.fs.zfs.vdev.*")) { 771 /* 772 * Device fault. 773 */ 774 zfs_case_solve(hdl, zcp, "fault.fs.zfs.device"); 775 } else if (fmd_nvl_class_match(hdl, nvl, 776 ZFS_MAKE_EREPORT(FM_EREPORT_ZFS_IO)) || 777 fmd_nvl_class_match(hdl, nvl, 778 ZFS_MAKE_EREPORT(FM_EREPORT_ZFS_CHECKSUM)) || 779 fmd_nvl_class_match(hdl, nvl, 780 ZFS_MAKE_EREPORT(FM_EREPORT_ZFS_IO_FAILURE)) || 781 fmd_nvl_class_match(hdl, nvl, 782 ZFS_MAKE_EREPORT(FM_EREPORT_ZFS_PROBE_FAILURE))) { 783 char *failmode = NULL; 784 boolean_t checkremove = B_FALSE; 785 uint32_t pri = 0; 786 int32_t flags = 0; 787 788 /* 789 * If this is a checksum or I/O error, then toss it into the 790 * appropriate SERD engine and check to see if it has fired. 791 * Ideally, we want to do something more sophisticated, 792 * (persistent errors for a single data block, etc). For now, 793 * a single SERD engine is sufficient. 794 */ 795 if (fmd_nvl_class_match(hdl, nvl, 796 ZFS_MAKE_EREPORT(FM_EREPORT_ZFS_IO))) { 797 if (zcp->zc_data.zc_serd_io[0] == '\0') { 798 if (nvlist_lookup_uint64(nvl, 799 FM_EREPORT_PAYLOAD_ZFS_VDEV_IO_N, 800 &io_n) != 0) { 801 io_n = DEFAULT_IO_N; 802 } 803 if (nvlist_lookup_uint64(nvl, 804 FM_EREPORT_PAYLOAD_ZFS_VDEV_IO_T, 805 &io_t) != 0) { 806 io_t = DEFAULT_IO_T; 807 } 808 zfs_serd_name(zcp->zc_data.zc_serd_io, 809 pool_guid, vdev_guid, "io"); 810 fmd_serd_create(hdl, zcp->zc_data.zc_serd_io, 811 io_n, 812 SEC2NSEC(io_t)); 813 zfs_case_serialize(zcp); 814 } 815 if (fmd_serd_record(hdl, zcp->zc_data.zc_serd_io, ep)) 816 checkremove = B_TRUE; 817 } else if (fmd_nvl_class_match(hdl, nvl, 818 ZFS_MAKE_EREPORT(FM_EREPORT_ZFS_CHECKSUM))) { 819 /* 820 * We ignore ereports for checksum errors generated by 821 * scrub/resilver I/O to avoid potentially further 822 * degrading the pool while it's being repaired. 823 */ 824 if (((nvlist_lookup_uint32(nvl, 825 FM_EREPORT_PAYLOAD_ZFS_ZIO_PRIORITY, &pri) == 0) && 826 (pri == ZIO_PRIORITY_SCRUB || 827 pri == ZIO_PRIORITY_REBUILD)) || 828 ((nvlist_lookup_int32(nvl, 829 FM_EREPORT_PAYLOAD_ZFS_ZIO_FLAGS, &flags) == 0) && 830 (flags & (ZIO_FLAG_SCRUB | ZIO_FLAG_RESILVER)))) { 831 fmd_hdl_debug(hdl, "ignoring '%s' for " 832 "scrub/resilver I/O", class); 833 return; 834 } 835 836 if (zcp->zc_data.zc_serd_checksum[0] == '\0') { 837 if (nvlist_lookup_uint64(nvl, 838 FM_EREPORT_PAYLOAD_ZFS_VDEV_CKSUM_N, 839 &checksum_n) != 0) { 840 checksum_n = DEFAULT_CHECKSUM_N; 841 } 842 if (nvlist_lookup_uint64(nvl, 843 FM_EREPORT_PAYLOAD_ZFS_VDEV_CKSUM_T, 844 &checksum_t) != 0) { 845 checksum_t = DEFAULT_CHECKSUM_T; 846 } 847 848 zfs_serd_name(zcp->zc_data.zc_serd_checksum, 849 pool_guid, vdev_guid, "checksum"); 850 fmd_serd_create(hdl, 851 zcp->zc_data.zc_serd_checksum, 852 checksum_n, 853 SEC2NSEC(checksum_t)); 854 zfs_case_serialize(zcp); 855 } 856 if (fmd_serd_record(hdl, 857 zcp->zc_data.zc_serd_checksum, ep)) { 858 zfs_case_solve(hdl, zcp, 859 "fault.fs.zfs.vdev.checksum"); 860 } 861 } else if (fmd_nvl_class_match(hdl, nvl, 862 ZFS_MAKE_EREPORT(FM_EREPORT_ZFS_IO_FAILURE)) && 863 (nvlist_lookup_string(nvl, 864 FM_EREPORT_PAYLOAD_ZFS_POOL_FAILMODE, &failmode) == 0) && 865 failmode != NULL) { 866 if (strncmp(failmode, FM_EREPORT_FAILMODE_CONTINUE, 867 strlen(FM_EREPORT_FAILMODE_CONTINUE)) == 0) { 868 zfs_case_solve(hdl, zcp, 869 "fault.fs.zfs.io_failure_continue"); 870 } else if (strncmp(failmode, FM_EREPORT_FAILMODE_WAIT, 871 strlen(FM_EREPORT_FAILMODE_WAIT)) == 0) { 872 zfs_case_solve(hdl, zcp, 873 "fault.fs.zfs.io_failure_wait"); 874 } 875 } else if (fmd_nvl_class_match(hdl, nvl, 876 ZFS_MAKE_EREPORT(FM_EREPORT_ZFS_PROBE_FAILURE))) { 877 #ifndef __linux__ 878 /* This causes an unexpected fault diagnosis on linux */ 879 checkremove = B_TRUE; 880 #endif 881 } 882 883 /* 884 * Because I/O errors may be due to device removal, we postpone 885 * any diagnosis until we're sure that we aren't about to 886 * receive a 'resource.fs.zfs.removed' event. 887 */ 888 if (checkremove) { 889 if (zcp->zc_data.zc_has_remove_timer) 890 fmd_timer_remove(hdl, zcp->zc_remove_timer); 891 zcp->zc_remove_timer = fmd_timer_install(hdl, zcp, NULL, 892 zfs_remove_timeout); 893 if (!zcp->zc_data.zc_has_remove_timer) { 894 zcp->zc_data.zc_has_remove_timer = 1; 895 zfs_case_serialize(zcp); 896 } 897 } 898 } 899 } 900 901 /* 902 * The timeout is fired when we diagnosed an I/O error, and it was not due to 903 * device removal (which would cause the timeout to be cancelled). 904 */ 905 static void 906 zfs_fm_timeout(fmd_hdl_t *hdl, id_t id, void *data) 907 { 908 zfs_case_t *zcp = data; 909 910 if (id == zcp->zc_remove_timer) 911 zfs_case_solve(hdl, zcp, "fault.fs.zfs.vdev.io"); 912 } 913 914 /* 915 * The specified case has been closed and any case-specific 916 * data structures should be deallocated. 917 */ 918 static void 919 zfs_fm_close(fmd_hdl_t *hdl, fmd_case_t *cs) 920 { 921 zfs_case_t *zcp = fmd_case_getspecific(hdl, cs); 922 923 if (zcp->zc_data.zc_serd_checksum[0] != '\0') 924 fmd_serd_destroy(hdl, zcp->zc_data.zc_serd_checksum); 925 if (zcp->zc_data.zc_serd_io[0] != '\0') 926 fmd_serd_destroy(hdl, zcp->zc_data.zc_serd_io); 927 if (zcp->zc_data.zc_has_remove_timer) 928 fmd_timer_remove(hdl, zcp->zc_remove_timer); 929 930 uu_list_remove(zfs_cases, zcp); 931 uu_list_node_fini(zcp, &zcp->zc_node, zfs_case_pool); 932 fmd_hdl_free(hdl, zcp, sizeof (zfs_case_t)); 933 } 934 935 /* 936 * We use the fmd gc entry point to look for old cases that no longer apply. 937 * This allows us to keep our set of case data small in a long running system. 938 */ 939 static void 940 zfs_fm_gc(fmd_hdl_t *hdl) 941 { 942 zfs_purge_cases(hdl); 943 } 944 945 static const fmd_hdl_ops_t fmd_ops = { 946 zfs_fm_recv, /* fmdo_recv */ 947 zfs_fm_timeout, /* fmdo_timeout */ 948 zfs_fm_close, /* fmdo_close */ 949 NULL, /* fmdo_stats */ 950 zfs_fm_gc, /* fmdo_gc */ 951 }; 952 953 static const fmd_prop_t fmd_props[] = { 954 { "checksum_N", FMD_TYPE_UINT32, "10" }, 955 { "checksum_T", FMD_TYPE_TIME, "10min" }, 956 { "io_N", FMD_TYPE_UINT32, "10" }, 957 { "io_T", FMD_TYPE_TIME, "10min" }, 958 { "remove_timeout", FMD_TYPE_TIME, "15sec" }, 959 { NULL, 0, NULL } 960 }; 961 962 static const fmd_hdl_info_t fmd_info = { 963 "ZFS Diagnosis Engine", "1.0", &fmd_ops, fmd_props 964 }; 965 966 void 967 _zfs_diagnosis_init(fmd_hdl_t *hdl) 968 { 969 libzfs_handle_t *zhdl; 970 971 if ((zhdl = libzfs_init()) == NULL) 972 return; 973 974 if ((zfs_case_pool = uu_list_pool_create("zfs_case_pool", 975 sizeof (zfs_case_t), offsetof(zfs_case_t, zc_node), 976 NULL, UU_LIST_POOL_DEBUG)) == NULL) { 977 libzfs_fini(zhdl); 978 return; 979 } 980 981 if ((zfs_cases = uu_list_create(zfs_case_pool, NULL, 982 UU_LIST_DEBUG)) == NULL) { 983 uu_list_pool_destroy(zfs_case_pool); 984 libzfs_fini(zhdl); 985 return; 986 } 987 988 if (fmd_hdl_register(hdl, FMD_API_VERSION, &fmd_info) != 0) { 989 uu_list_destroy(zfs_cases); 990 uu_list_pool_destroy(zfs_case_pool); 991 libzfs_fini(zhdl); 992 return; 993 } 994 995 fmd_hdl_setspecific(hdl, zhdl); 996 997 (void) fmd_stat_create(hdl, FMD_STAT_NOALLOC, sizeof (zfs_stats) / 998 sizeof (fmd_stat_t), (fmd_stat_t *)&zfs_stats); 999 1000 zfs_remove_timeout = fmd_prop_get_int64(hdl, "remove_timeout"); 1001 } 1002 1003 void 1004 _zfs_diagnosis_fini(fmd_hdl_t *hdl) 1005 { 1006 zfs_case_t *zcp; 1007 uu_list_walk_t *walk; 1008 libzfs_handle_t *zhdl; 1009 1010 /* 1011 * Remove all active cases. 1012 */ 1013 walk = uu_list_walk_start(zfs_cases, UU_WALK_ROBUST); 1014 while ((zcp = uu_list_walk_next(walk)) != NULL) { 1015 fmd_hdl_debug(hdl, "removing case ena %llu", 1016 (long long unsigned)zcp->zc_data.zc_ena); 1017 uu_list_remove(zfs_cases, zcp); 1018 uu_list_node_fini(zcp, &zcp->zc_node, zfs_case_pool); 1019 fmd_hdl_free(hdl, zcp, sizeof (zfs_case_t)); 1020 } 1021 uu_list_walk_end(walk); 1022 1023 uu_list_destroy(zfs_cases); 1024 uu_list_pool_destroy(zfs_case_pool); 1025 1026 zhdl = fmd_hdl_getspecific(hdl); 1027 libzfs_fini(zhdl); 1028 }
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