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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 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 (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Copyright (c) 2011 by Delphix. All rights reserved.
25 */
26
27/*
28 * This file contains all the routines used when modifying on-disk SPA state.
29 * This includes opening, importing, destroying, exporting a pool, and syncing a
30 * pool.
31 */
32
33#include <sys/zfs_context.h>
34#include <sys/fm/fs/zfs.h>
35#include <sys/spa_impl.h>
36#include <sys/zio.h>
37#include <sys/zio_checksum.h>
38#include <sys/dmu.h>
39#include <sys/dmu_tx.h>
40#include <sys/zap.h>
41#include <sys/zil.h>
42#include <sys/ddt.h>
43#include <sys/vdev_impl.h>
44#include <sys/metaslab.h>
45#include <sys/metaslab_impl.h>
46#include <sys/uberblock_impl.h>
47#include <sys/txg.h>
48#include <sys/avl.h>
49#include <sys/dmu_traverse.h>
50#include <sys/dmu_objset.h>
51#include <sys/unique.h>
52#include <sys/dsl_pool.h>
53#include <sys/dsl_dataset.h>
54#include <sys/dsl_dir.h>
55#include <sys/dsl_prop.h>
56#include <sys/dsl_synctask.h>
57#include <sys/fs/zfs.h>
58#include <sys/arc.h>
59#include <sys/callb.h>
60#include <sys/spa_boot.h>
61#include <sys/zfs_ioctl.h>
62#include <sys/dsl_scan.h>
63#include <sys/zvol.h>
64
65#ifdef _KERNEL
66#include <sys/callb.h>
67#include <sys/cpupart.h>
68#include <sys/zone.h>
69#endif /* _KERNEL */
70
71#include "zfs_prop.h"
72#include "zfs_comutil.h"
73
74/* Check hostid on import? */
75static int check_hostid = 1;
76
77SYSCTL_DECL(_vfs_zfs);
78TUNABLE_INT("vfs.zfs.check_hostid", &check_hostid);
79SYSCTL_INT(_vfs_zfs, OID_AUTO, check_hostid, CTLFLAG_RW, &check_hostid, 0,
80 "Check hostid on import?");
81
82typedef enum zti_modes {
83 zti_mode_fixed, /* value is # of threads (min 1) */
84 zti_mode_online_percent, /* value is % of online CPUs */
85 zti_mode_batch, /* cpu-intensive; value is ignored */
86 zti_mode_null, /* don't create a taskq */
87 zti_nmodes
88} zti_modes_t;
89
90#define ZTI_FIX(n) { zti_mode_fixed, (n) }
91#define ZTI_PCT(n) { zti_mode_online_percent, (n) }
92#define ZTI_BATCH { zti_mode_batch, 0 }
93#define ZTI_NULL { zti_mode_null, 0 }
94
95#define ZTI_ONE ZTI_FIX(1)
96
97typedef struct zio_taskq_info {
98 enum zti_modes zti_mode;
99 uint_t zti_value;
100} zio_taskq_info_t;
101
102static const char *const zio_taskq_types[ZIO_TASKQ_TYPES] = {
103 "issue", "issue_high", "intr", "intr_high"
104};
105
106/*
107 * Define the taskq threads for the following I/O types:
108 * NULL, READ, WRITE, FREE, CLAIM, and IOCTL
109 */
110const zio_taskq_info_t zio_taskqs[ZIO_TYPES][ZIO_TASKQ_TYPES] = {
111 /* ISSUE ISSUE_HIGH INTR INTR_HIGH */
112 { ZTI_ONE, ZTI_NULL, ZTI_ONE, ZTI_NULL },
113 { ZTI_FIX(8), ZTI_NULL, ZTI_BATCH, ZTI_NULL },
114 { ZTI_BATCH, ZTI_FIX(5), ZTI_FIX(8), ZTI_FIX(5) },
115 { ZTI_FIX(100), ZTI_NULL, ZTI_ONE, ZTI_NULL },
116 { ZTI_ONE, ZTI_NULL, ZTI_ONE, ZTI_NULL },
117 { ZTI_ONE, ZTI_NULL, ZTI_ONE, ZTI_NULL },
118};
119
120static dsl_syncfunc_t spa_sync_props;
121static boolean_t spa_has_active_shared_spare(spa_t *spa);
122static int spa_load_impl(spa_t *spa, uint64_t, nvlist_t *config,
123 spa_load_state_t state, spa_import_type_t type, boolean_t mosconfig,
124 char **ereport);
125static void spa_vdev_resilver_done(spa_t *spa);
126
127uint_t zio_taskq_batch_pct = 100; /* 1 thread per cpu in pset */
128#ifdef PSRSET_BIND
129id_t zio_taskq_psrset_bind = PS_NONE;
130#endif
131#ifdef SYSDC
132boolean_t zio_taskq_sysdc = B_TRUE; /* use SDC scheduling class */
133#endif
134uint_t zio_taskq_basedc = 80; /* base duty cycle */
135
136boolean_t spa_create_process = B_TRUE; /* no process ==> no sysdc */
137
138/*
139 * This (illegal) pool name is used when temporarily importing a spa_t in order
140 * to get the vdev stats associated with the imported devices.
141 */
142#define TRYIMPORT_NAME "$import"
143
144/*
145 * ==========================================================================
146 * SPA properties routines
147 * ==========================================================================
148 */
149
150/*
151 * Add a (source=src, propname=propval) list to an nvlist.
152 */
153static void
154spa_prop_add_list(nvlist_t *nvl, zpool_prop_t prop, char *strval,
155 uint64_t intval, zprop_source_t src)
156{
157 const char *propname = zpool_prop_to_name(prop);
158 nvlist_t *propval;
159
160 VERIFY(nvlist_alloc(&propval, NV_UNIQUE_NAME, KM_SLEEP) == 0);
161 VERIFY(nvlist_add_uint64(propval, ZPROP_SOURCE, src) == 0);
162
163 if (strval != NULL)
164 VERIFY(nvlist_add_string(propval, ZPROP_VALUE, strval) == 0);
165 else
166 VERIFY(nvlist_add_uint64(propval, ZPROP_VALUE, intval) == 0);
167
168 VERIFY(nvlist_add_nvlist(nvl, propname, propval) == 0);
169 nvlist_free(propval);
170}
171
172/*
173 * Get property values from the spa configuration.
174 */
175static void
176spa_prop_get_config(spa_t *spa, nvlist_t **nvp)
177{
178 uint64_t size;
179 uint64_t alloc;
180 uint64_t cap, version;
181 zprop_source_t src = ZPROP_SRC_NONE;
182 spa_config_dirent_t *dp;
183
184 ASSERT(MUTEX_HELD(&spa->spa_props_lock));
185
186 if (spa->spa_root_vdev != NULL) {
187 alloc = metaslab_class_get_alloc(spa_normal_class(spa));
188 size = metaslab_class_get_space(spa_normal_class(spa));
189 spa_prop_add_list(*nvp, ZPOOL_PROP_NAME, spa_name(spa), 0, src);
190 spa_prop_add_list(*nvp, ZPOOL_PROP_SIZE, NULL, size, src);
191 spa_prop_add_list(*nvp, ZPOOL_PROP_ALLOCATED, NULL, alloc, src);
192 spa_prop_add_list(*nvp, ZPOOL_PROP_FREE, NULL,
193 size - alloc, src);
194 spa_prop_add_list(*nvp, ZPOOL_PROP_READONLY, NULL,
195 (spa_mode(spa) == FREAD), src);
196
197 cap = (size == 0) ? 0 : (alloc * 100 / size);
198 spa_prop_add_list(*nvp, ZPOOL_PROP_CAPACITY, NULL, cap, src);
199
200 spa_prop_add_list(*nvp, ZPOOL_PROP_DEDUPRATIO, NULL,
201 ddt_get_pool_dedup_ratio(spa), src);
202
203 spa_prop_add_list(*nvp, ZPOOL_PROP_HEALTH, NULL,
204 spa->spa_root_vdev->vdev_state, src);
205
206 version = spa_version(spa);
207 if (version == zpool_prop_default_numeric(ZPOOL_PROP_VERSION))
208 src = ZPROP_SRC_DEFAULT;
209 else
210 src = ZPROP_SRC_LOCAL;
211 spa_prop_add_list(*nvp, ZPOOL_PROP_VERSION, NULL, version, src);
212 }
213
214 spa_prop_add_list(*nvp, ZPOOL_PROP_GUID, NULL, spa_guid(spa), src);
215
216 if (spa->spa_comment != NULL) {
217 spa_prop_add_list(*nvp, ZPOOL_PROP_COMMENT, spa->spa_comment,
218 0, ZPROP_SRC_LOCAL);
219 }
220
221 if (spa->spa_root != NULL)
222 spa_prop_add_list(*nvp, ZPOOL_PROP_ALTROOT, spa->spa_root,
223 0, ZPROP_SRC_LOCAL);
224
225 if ((dp = list_head(&spa->spa_config_list)) != NULL) {
226 if (dp->scd_path == NULL) {
227 spa_prop_add_list(*nvp, ZPOOL_PROP_CACHEFILE,
228 "none", 0, ZPROP_SRC_LOCAL);
229 } else if (strcmp(dp->scd_path, spa_config_path) != 0) {
230 spa_prop_add_list(*nvp, ZPOOL_PROP_CACHEFILE,
231 dp->scd_path, 0, ZPROP_SRC_LOCAL);
232 }
233 }
234}
235
236/*
237 * Get zpool property values.
238 */
239int
240spa_prop_get(spa_t *spa, nvlist_t **nvp)
241{
242 objset_t *mos = spa->spa_meta_objset;
243 zap_cursor_t zc;
244 zap_attribute_t za;
245 int err;
246
247 VERIFY(nvlist_alloc(nvp, NV_UNIQUE_NAME, KM_SLEEP) == 0);
248
249 mutex_enter(&spa->spa_props_lock);
250
251 /*
252 * Get properties from the spa config.
253 */
254 spa_prop_get_config(spa, nvp);
255
256 /* If no pool property object, no more prop to get. */
257 if (mos == NULL || spa->spa_pool_props_object == 0) {
258 mutex_exit(&spa->spa_props_lock);
259 return (0);
260 }
261
262 /*
263 * Get properties from the MOS pool property object.
264 */
265 for (zap_cursor_init(&zc, mos, spa->spa_pool_props_object);
266 (err = zap_cursor_retrieve(&zc, &za)) == 0;
267 zap_cursor_advance(&zc)) {
268 uint64_t intval = 0;
269 char *strval = NULL;
270 zprop_source_t src = ZPROP_SRC_DEFAULT;
271 zpool_prop_t prop;
272
273 if ((prop = zpool_name_to_prop(za.za_name)) == ZPROP_INVAL)
274 continue;
275
276 switch (za.za_integer_length) {
277 case 8:
278 /* integer property */
279 if (za.za_first_integer !=
280 zpool_prop_default_numeric(prop))
281 src = ZPROP_SRC_LOCAL;
282
283 if (prop == ZPOOL_PROP_BOOTFS) {
284 dsl_pool_t *dp;
285 dsl_dataset_t *ds = NULL;
286
287 dp = spa_get_dsl(spa);
288 rw_enter(&dp->dp_config_rwlock, RW_READER);
289 if (err = dsl_dataset_hold_obj(dp,
290 za.za_first_integer, FTAG, &ds)) {
291 rw_exit(&dp->dp_config_rwlock);
292 break;
293 }
294
295 strval = kmem_alloc(
296 MAXNAMELEN + strlen(MOS_DIR_NAME) + 1,
297 KM_SLEEP);
298 dsl_dataset_name(ds, strval);
299 dsl_dataset_rele(ds, FTAG);
300 rw_exit(&dp->dp_config_rwlock);
301 } else {
302 strval = NULL;
303 intval = za.za_first_integer;
304 }
305
306 spa_prop_add_list(*nvp, prop, strval, intval, src);
307
308 if (strval != NULL)
309 kmem_free(strval,
310 MAXNAMELEN + strlen(MOS_DIR_NAME) + 1);
311
312 break;
313
314 case 1:
315 /* string property */
316 strval = kmem_alloc(za.za_num_integers, KM_SLEEP);
317 err = zap_lookup(mos, spa->spa_pool_props_object,
318 za.za_name, 1, za.za_num_integers, strval);
319 if (err) {
320 kmem_free(strval, za.za_num_integers);
321 break;
322 }
323 spa_prop_add_list(*nvp, prop, strval, 0, src);
324 kmem_free(strval, za.za_num_integers);
325 break;
326
327 default:
328 break;
329 }
330 }
331 zap_cursor_fini(&zc);
332 mutex_exit(&spa->spa_props_lock);
333out:
334 if (err && err != ENOENT) {
335 nvlist_free(*nvp);
336 *nvp = NULL;
337 return (err);
338 }
339
340 return (0);
341}
342
343/*
344 * Validate the given pool properties nvlist and modify the list
345 * for the property values to be set.
346 */
347static int
348spa_prop_validate(spa_t *spa, nvlist_t *props)
349{
350 nvpair_t *elem;
351 int error = 0, reset_bootfs = 0;
352 uint64_t objnum;
353
354 elem = NULL;
355 while ((elem = nvlist_next_nvpair(props, elem)) != NULL) {
356 zpool_prop_t prop;
357 char *propname, *strval;
358 uint64_t intval;
359 objset_t *os;
360 char *slash, *check;
361
362 propname = nvpair_name(elem);
363
364 if ((prop = zpool_name_to_prop(propname)) == ZPROP_INVAL)
365 return (EINVAL);
366
367 switch (prop) {
368 case ZPOOL_PROP_VERSION:
369 error = nvpair_value_uint64(elem, &intval);
370 if (!error &&
371 (intval < spa_version(spa) || intval > SPA_VERSION))
372 error = EINVAL;
373 break;
374
375 case ZPOOL_PROP_DELEGATION:
376 case ZPOOL_PROP_AUTOREPLACE:
377 case ZPOOL_PROP_LISTSNAPS:
378 case ZPOOL_PROP_AUTOEXPAND:
379 error = nvpair_value_uint64(elem, &intval);
380 if (!error && intval > 1)
381 error = EINVAL;
382 break;
383
384 case ZPOOL_PROP_BOOTFS:
385 /*
386 * If the pool version is less than SPA_VERSION_BOOTFS,
387 * or the pool is still being created (version == 0),
388 * the bootfs property cannot be set.
389 */
390 if (spa_version(spa) < SPA_VERSION_BOOTFS) {
391 error = ENOTSUP;
392 break;
393 }
394
395 /*
396 * Make sure the vdev config is bootable
397 */
398 if (!vdev_is_bootable(spa->spa_root_vdev)) {
399 error = ENOTSUP;
400 break;
401 }
402
403 reset_bootfs = 1;
404
405 error = nvpair_value_string(elem, &strval);
406
407 if (!error) {
408 uint64_t compress;
409
410 if (strval == NULL || strval[0] == '\0') {
411 objnum = zpool_prop_default_numeric(
412 ZPOOL_PROP_BOOTFS);
413 break;
414 }
415
416 if (error = dmu_objset_hold(strval, FTAG, &os))
417 break;
418
419 /* Must be ZPL and not gzip compressed. */
420
421 if (dmu_objset_type(os) != DMU_OST_ZFS) {
422 error = ENOTSUP;
423 } else if ((error = dsl_prop_get_integer(strval,
424 zfs_prop_to_name(ZFS_PROP_COMPRESSION),
425 &compress, NULL)) == 0 &&
426 !BOOTFS_COMPRESS_VALID(compress)) {
427 error = ENOTSUP;
428 } else {
429 objnum = dmu_objset_id(os);
430 }
431 dmu_objset_rele(os, FTAG);
432 }
433 break;
434
435 case ZPOOL_PROP_FAILUREMODE:
436 error = nvpair_value_uint64(elem, &intval);
437 if (!error && (intval < ZIO_FAILURE_MODE_WAIT ||
438 intval > ZIO_FAILURE_MODE_PANIC))
439 error = EINVAL;
440
441 /*
442 * This is a special case which only occurs when
443 * the pool has completely failed. This allows
444 * the user to change the in-core failmode property
445 * without syncing it out to disk (I/Os might
446 * currently be blocked). We do this by returning
447 * EIO to the caller (spa_prop_set) to trick it
448 * into thinking we encountered a property validation
449 * error.
450 */
451 if (!error && spa_suspended(spa)) {
452 spa->spa_failmode = intval;
453 error = EIO;
454 }
455 break;
456
457 case ZPOOL_PROP_CACHEFILE:
458 if ((error = nvpair_value_string(elem, &strval)) != 0)
459 break;
460
461 if (strval[0] == '\0')
462 break;
463
464 if (strcmp(strval, "none") == 0)
465 break;
466
467 if (strval[0] != '/') {
468 error = EINVAL;
469 break;
470 }
471
472 slash = strrchr(strval, '/');
473 ASSERT(slash != NULL);
474
475 if (slash[1] == '\0' || strcmp(slash, "/.") == 0 ||
476 strcmp(slash, "/..") == 0)
477 error = EINVAL;
478 break;
479
480 case ZPOOL_PROP_COMMENT:
481 if ((error = nvpair_value_string(elem, &strval)) != 0)
482 break;
483 for (check = strval; *check != '\0'; check++) {
484 /*
485 * The kernel doesn't have an easy isprint()
486 * check. For this kernel check, we merely
487 * check ASCII apart from DEL. Fix this if
488 * there is an easy-to-use kernel isprint().
489 */
490 if (*check >= 0x7f) {
491 error = EINVAL;
492 break;
493 }
494 check++;
495 }
496 if (strlen(strval) > ZPROP_MAX_COMMENT)
497 error = E2BIG;
498 break;
499
500 case ZPOOL_PROP_DEDUPDITTO:
501 if (spa_version(spa) < SPA_VERSION_DEDUP)
502 error = ENOTSUP;
503 else
504 error = nvpair_value_uint64(elem, &intval);
505 if (error == 0 &&
506 intval != 0 && intval < ZIO_DEDUPDITTO_MIN)
507 error = EINVAL;
508 break;
509 }
510
511 if (error)
512 break;
513 }
514
515 if (!error && reset_bootfs) {
516 error = nvlist_remove(props,
517 zpool_prop_to_name(ZPOOL_PROP_BOOTFS), DATA_TYPE_STRING);
518
519 if (!error) {
520 error = nvlist_add_uint64(props,
521 zpool_prop_to_name(ZPOOL_PROP_BOOTFS), objnum);
522 }
523 }
524
525 return (error);
526}
527
528void
529spa_configfile_set(spa_t *spa, nvlist_t *nvp, boolean_t need_sync)
530{
531 char *cachefile;
532 spa_config_dirent_t *dp;
533
534 if (nvlist_lookup_string(nvp, zpool_prop_to_name(ZPOOL_PROP_CACHEFILE),
535 &cachefile) != 0)
536 return;
537
538 dp = kmem_alloc(sizeof (spa_config_dirent_t),
539 KM_SLEEP);
540
541 if (cachefile[0] == '\0')
542 dp->scd_path = spa_strdup(spa_config_path);
543 else if (strcmp(cachefile, "none") == 0)
544 dp->scd_path = NULL;
545 else
546 dp->scd_path = spa_strdup(cachefile);
547
548 list_insert_head(&spa->spa_config_list, dp);
549 if (need_sync)
550 spa_async_request(spa, SPA_ASYNC_CONFIG_UPDATE);
551}
552
553int
554spa_prop_set(spa_t *spa, nvlist_t *nvp)
555{
556 int error;
557 nvpair_t *elem;
558 boolean_t need_sync = B_FALSE;
559 zpool_prop_t prop;
560
561 if ((error = spa_prop_validate(spa, nvp)) != 0)
562 return (error);
563
564 elem = NULL;
565 while ((elem = nvlist_next_nvpair(nvp, elem)) != NULL) {
566 if ((prop = zpool_name_to_prop(
567 nvpair_name(elem))) == ZPROP_INVAL)
568 return (EINVAL);
569
570 if (prop == ZPOOL_PROP_CACHEFILE ||
571 prop == ZPOOL_PROP_ALTROOT ||
572 prop == ZPOOL_PROP_READONLY)
573 continue;
574
575 need_sync = B_TRUE;
576 break;
577 }
578
579 if (need_sync)
580 return (dsl_sync_task_do(spa_get_dsl(spa), NULL, spa_sync_props,
581 spa, nvp, 3));
582 else
583 return (0);
584}
585
586/*
587 * If the bootfs property value is dsobj, clear it.
588 */
589void
590spa_prop_clear_bootfs(spa_t *spa, uint64_t dsobj, dmu_tx_t *tx)
591{
592 if (spa->spa_bootfs == dsobj && spa->spa_pool_props_object != 0) {
593 VERIFY(zap_remove(spa->spa_meta_objset,
594 spa->spa_pool_props_object,
595 zpool_prop_to_name(ZPOOL_PROP_BOOTFS), tx) == 0);
596 spa->spa_bootfs = 0;
597 }
598}
599
600/*
601 * Change the GUID for the pool. This is done so that we can later
602 * re-import a pool built from a clone of our own vdevs. We will modify
603 * the root vdev's guid, our own pool guid, and then mark all of our
604 * vdevs dirty. Note that we must make sure that all our vdevs are
605 * online when we do this, or else any vdevs that weren't present
606 * would be orphaned from our pool. We are also going to issue a
607 * sysevent to update any watchers.
608 */
609int
610spa_change_guid(spa_t *spa)
611{
612 uint64_t oldguid, newguid;
613 uint64_t txg;
614
615 if (!(spa_mode_global & FWRITE))
616 return (EROFS);
617
618 txg = spa_vdev_enter(spa);
619
620 if (spa->spa_root_vdev->vdev_state != VDEV_STATE_HEALTHY)
621 return (spa_vdev_exit(spa, NULL, txg, ENXIO));
622
623 oldguid = spa_guid(spa);
624 newguid = spa_generate_guid(NULL);
625 ASSERT3U(oldguid, !=, newguid);
626
627 spa->spa_root_vdev->vdev_guid = newguid;
628 spa->spa_root_vdev->vdev_guid_sum += (newguid - oldguid);
629
630 vdev_config_dirty(spa->spa_root_vdev);
631
632 spa_event_notify(spa, NULL, ESC_ZFS_POOL_REGUID);
633
634 return (spa_vdev_exit(spa, NULL, txg, 0));
635}
636
637/*
638 * ==========================================================================
639 * SPA state manipulation (open/create/destroy/import/export)
640 * ==========================================================================
641 */
642
643static int
644spa_error_entry_compare(const void *a, const void *b)
645{
646 spa_error_entry_t *sa = (spa_error_entry_t *)a;
647 spa_error_entry_t *sb = (spa_error_entry_t *)b;
648 int ret;
649
650 ret = bcmp(&sa->se_bookmark, &sb->se_bookmark,
651 sizeof (zbookmark_t));
652
653 if (ret < 0)
654 return (-1);
655 else if (ret > 0)
656 return (1);
657 else
658 return (0);
659}
660
661/*
662 * Utility function which retrieves copies of the current logs and
663 * re-initializes them in the process.
664 */
665void
666spa_get_errlists(spa_t *spa, avl_tree_t *last, avl_tree_t *scrub)
667{
668 ASSERT(MUTEX_HELD(&spa->spa_errlist_lock));
669
670 bcopy(&spa->spa_errlist_last, last, sizeof (avl_tree_t));
671 bcopy(&spa->spa_errlist_scrub, scrub, sizeof (avl_tree_t));
672
673 avl_create(&spa->spa_errlist_scrub,
674 spa_error_entry_compare, sizeof (spa_error_entry_t),
675 offsetof(spa_error_entry_t, se_avl));
676 avl_create(&spa->spa_errlist_last,
677 spa_error_entry_compare, sizeof (spa_error_entry_t),
678 offsetof(spa_error_entry_t, se_avl));
679}
680
681static taskq_t *
682spa_taskq_create(spa_t *spa, const char *name, enum zti_modes mode,
683 uint_t value)
684{
685 uint_t flags = TASKQ_PREPOPULATE;
686 boolean_t batch = B_FALSE;
687
688 switch (mode) {
689 case zti_mode_null:
690 return (NULL); /* no taskq needed */
691
692 case zti_mode_fixed:
693 ASSERT3U(value, >=, 1);
694 value = MAX(value, 1);
695 break;
696
697 case zti_mode_batch:
698 batch = B_TRUE;
699 flags |= TASKQ_THREADS_CPU_PCT;
700 value = zio_taskq_batch_pct;
701 break;
702
703 case zti_mode_online_percent:
704 flags |= TASKQ_THREADS_CPU_PCT;
705 break;
706
707 default:
708 panic("unrecognized mode for %s taskq (%u:%u) in "
709 "spa_activate()",
710 name, mode, value);
711 break;
712 }
713
714#ifdef SYSDC
715 if (zio_taskq_sysdc && spa->spa_proc != &p0) {
716 if (batch)
717 flags |= TASKQ_DC_BATCH;
718
719 return (taskq_create_sysdc(name, value, 50, INT_MAX,
720 spa->spa_proc, zio_taskq_basedc, flags));
721 }
722#endif
723 return (taskq_create_proc(name, value, maxclsyspri, 50, INT_MAX,
724 spa->spa_proc, flags));
725}
726
727static void
728spa_create_zio_taskqs(spa_t *spa)
729{
730 for (int t = 0; t < ZIO_TYPES; t++) {
731 for (int q = 0; q < ZIO_TASKQ_TYPES; q++) {
732 const zio_taskq_info_t *ztip = &zio_taskqs[t][q];
733 enum zti_modes mode = ztip->zti_mode;
734 uint_t value = ztip->zti_value;
735 char name[32];
736
737 (void) snprintf(name, sizeof (name),
738 "%s_%s", zio_type_name[t], zio_taskq_types[q]);
739
740 spa->spa_zio_taskq[t][q] =
741 spa_taskq_create(spa, name, mode, value);
742 }
743 }
744}
745
746#ifdef _KERNEL
747#ifdef SPA_PROCESS
748static void
749spa_thread(void *arg)
750{
751 callb_cpr_t cprinfo;
752
753 spa_t *spa = arg;
754 user_t *pu = PTOU(curproc);
755
756 CALLB_CPR_INIT(&cprinfo, &spa->spa_proc_lock, callb_generic_cpr,
757 spa->spa_name);
758
759 ASSERT(curproc != &p0);
760 (void) snprintf(pu->u_psargs, sizeof (pu->u_psargs),
761 "zpool-%s", spa->spa_name);
762 (void) strlcpy(pu->u_comm, pu->u_psargs, sizeof (pu->u_comm));
763
764#ifdef PSRSET_BIND
765 /* bind this thread to the requested psrset */
766 if (zio_taskq_psrset_bind != PS_NONE) {
767 pool_lock();
768 mutex_enter(&cpu_lock);
769 mutex_enter(&pidlock);
770 mutex_enter(&curproc->p_lock);
771
772 if (cpupart_bind_thread(curthread, zio_taskq_psrset_bind,
773 0, NULL, NULL) == 0) {
774 curthread->t_bind_pset = zio_taskq_psrset_bind;
775 } else {
776 cmn_err(CE_WARN,
777 "Couldn't bind process for zfs pool \"%s\" to "
778 "pset %d\n", spa->spa_name, zio_taskq_psrset_bind);
779 }
780
781 mutex_exit(&curproc->p_lock);
782 mutex_exit(&pidlock);
783 mutex_exit(&cpu_lock);
784 pool_unlock();
785 }
786#endif
787
788#ifdef SYSDC
789 if (zio_taskq_sysdc) {
790 sysdc_thread_enter(curthread, 100, 0);
791 }
792#endif
793
794 spa->spa_proc = curproc;
795 spa->spa_did = curthread->t_did;
796
797 spa_create_zio_taskqs(spa);
798
799 mutex_enter(&spa->spa_proc_lock);
800 ASSERT(spa->spa_proc_state == SPA_PROC_CREATED);
801
802 spa->spa_proc_state = SPA_PROC_ACTIVE;
803 cv_broadcast(&spa->spa_proc_cv);
804
805 CALLB_CPR_SAFE_BEGIN(&cprinfo);
806 while (spa->spa_proc_state == SPA_PROC_ACTIVE)
807 cv_wait(&spa->spa_proc_cv, &spa->spa_proc_lock);
808 CALLB_CPR_SAFE_END(&cprinfo, &spa->spa_proc_lock);
809
810 ASSERT(spa->spa_proc_state == SPA_PROC_DEACTIVATE);
811 spa->spa_proc_state = SPA_PROC_GONE;
812 spa->spa_proc = &p0;
813 cv_broadcast(&spa->spa_proc_cv);
814 CALLB_CPR_EXIT(&cprinfo); /* drops spa_proc_lock */
815
816 mutex_enter(&curproc->p_lock);
817 lwp_exit();
818}
819#endif /* SPA_PROCESS */
820#endif
821
822/*
823 * Activate an uninitialized pool.
824 */
825static void
826spa_activate(spa_t *spa, int mode)
827{
828 ASSERT(spa->spa_state == POOL_STATE_UNINITIALIZED);
829
830 spa->spa_state = POOL_STATE_ACTIVE;
831 spa->spa_mode = mode;
832
833 spa->spa_normal_class = metaslab_class_create(spa, zfs_metaslab_ops);
834 spa->spa_log_class = metaslab_class_create(spa, zfs_metaslab_ops);
835
836 /* Try to create a covering process */
837 mutex_enter(&spa->spa_proc_lock);
838 ASSERT(spa->spa_proc_state == SPA_PROC_NONE);
839 ASSERT(spa->spa_proc == &p0);
840 spa->spa_did = 0;
841
842#ifdef SPA_PROCESS
843 /* Only create a process if we're going to be around a while. */
844 if (spa_create_process && strcmp(spa->spa_name, TRYIMPORT_NAME) != 0) {
845 if (newproc(spa_thread, (caddr_t)spa, syscid, maxclsyspri,
846 NULL, 0) == 0) {
847 spa->spa_proc_state = SPA_PROC_CREATED;
848 while (spa->spa_proc_state == SPA_PROC_CREATED) {
849 cv_wait(&spa->spa_proc_cv,
850 &spa->spa_proc_lock);
851 }
852 ASSERT(spa->spa_proc_state == SPA_PROC_ACTIVE);
853 ASSERT(spa->spa_proc != &p0);
854 ASSERT(spa->spa_did != 0);
855 } else {
856#ifdef _KERNEL
857 cmn_err(CE_WARN,
858 "Couldn't create process for zfs pool \"%s\"\n",
859 spa->spa_name);
860#endif
861 }
862 }
863#endif /* SPA_PROCESS */
864 mutex_exit(&spa->spa_proc_lock);
865
866 /* If we didn't create a process, we need to create our taskqs. */
867 ASSERT(spa->spa_proc == &p0);
868 if (spa->spa_proc == &p0) {
869 spa_create_zio_taskqs(spa);
870 }
871
872 list_create(&spa->spa_config_dirty_list, sizeof (vdev_t),
873 offsetof(vdev_t, vdev_config_dirty_node));
874 list_create(&spa->spa_state_dirty_list, sizeof (vdev_t),
875 offsetof(vdev_t, vdev_state_dirty_node));
876
877 txg_list_create(&spa->spa_vdev_txg_list,
878 offsetof(struct vdev, vdev_txg_node));
879
880 avl_create(&spa->spa_errlist_scrub,
881 spa_error_entry_compare, sizeof (spa_error_entry_t),
882 offsetof(spa_error_entry_t, se_avl));
883 avl_create(&spa->spa_errlist_last,
884 spa_error_entry_compare, sizeof (spa_error_entry_t),
885 offsetof(spa_error_entry_t, se_avl));
886}
887
888/*
889 * Opposite of spa_activate().
890 */
891static void
892spa_deactivate(spa_t *spa)
893{
894 ASSERT(spa->spa_sync_on == B_FALSE);
895 ASSERT(spa->spa_dsl_pool == NULL);
896 ASSERT(spa->spa_root_vdev == NULL);
897 ASSERT(spa->spa_async_zio_root == NULL);
898 ASSERT(spa->spa_state != POOL_STATE_UNINITIALIZED);
899
900 txg_list_destroy(&spa->spa_vdev_txg_list);
901
902 list_destroy(&spa->spa_config_dirty_list);
903 list_destroy(&spa->spa_state_dirty_list);
904
905 for (int t = 0; t < ZIO_TYPES; t++) {
906 for (int q = 0; q < ZIO_TASKQ_TYPES; q++) {
907 if (spa->spa_zio_taskq[t][q] != NULL)
908 taskq_destroy(spa->spa_zio_taskq[t][q]);
909 spa->spa_zio_taskq[t][q] = NULL;
910 }
911 }
912
913 metaslab_class_destroy(spa->spa_normal_class);
914 spa->spa_normal_class = NULL;
915
916 metaslab_class_destroy(spa->spa_log_class);
917 spa->spa_log_class = NULL;
918
919 /*
920 * If this was part of an import or the open otherwise failed, we may
921 * still have errors left in the queues. Empty them just in case.
922 */
923 spa_errlog_drain(spa);
924
925 avl_destroy(&spa->spa_errlist_scrub);
926 avl_destroy(&spa->spa_errlist_last);
927
928 spa->spa_state = POOL_STATE_UNINITIALIZED;
929
930 mutex_enter(&spa->spa_proc_lock);
931 if (spa->spa_proc_state != SPA_PROC_NONE) {
932 ASSERT(spa->spa_proc_state == SPA_PROC_ACTIVE);
933 spa->spa_proc_state = SPA_PROC_DEACTIVATE;
934 cv_broadcast(&spa->spa_proc_cv);
935 while (spa->spa_proc_state == SPA_PROC_DEACTIVATE) {
936 ASSERT(spa->spa_proc != &p0);
937 cv_wait(&spa->spa_proc_cv, &spa->spa_proc_lock);
938 }
939 ASSERT(spa->spa_proc_state == SPA_PROC_GONE);
940 spa->spa_proc_state = SPA_PROC_NONE;
941 }
942 ASSERT(spa->spa_proc == &p0);
943 mutex_exit(&spa->spa_proc_lock);
944
945#ifdef SPA_PROCESS
946 /*
947 * We want to make sure spa_thread() has actually exited the ZFS
948 * module, so that the module can't be unloaded out from underneath
949 * it.
950 */
951 if (spa->spa_did != 0) {
952 thread_join(spa->spa_did);
953 spa->spa_did = 0;
954 }
955#endif /* SPA_PROCESS */
956}
957
958/*
959 * Verify a pool configuration, and construct the vdev tree appropriately. This
960 * will create all the necessary vdevs in the appropriate layout, with each vdev
961 * in the CLOSED state. This will prep the pool before open/creation/import.
962 * All vdev validation is done by the vdev_alloc() routine.
963 */
964static int
965spa_config_parse(spa_t *spa, vdev_t **vdp, nvlist_t *nv, vdev_t *parent,
966 uint_t id, int atype)
967{
968 nvlist_t **child;
969 uint_t children;
970 int error;
971
972 if ((error = vdev_alloc(spa, vdp, nv, parent, id, atype)) != 0)
973 return (error);
974
975 if ((*vdp)->vdev_ops->vdev_op_leaf)
976 return (0);
977
978 error = nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN,
979 &child, &children);
980
981 if (error == ENOENT)
982 return (0);
983
984 if (error) {
985 vdev_free(*vdp);
986 *vdp = NULL;
987 return (EINVAL);
988 }
989
990 for (int c = 0; c < children; c++) {
991 vdev_t *vd;
992 if ((error = spa_config_parse(spa, &vd, child[c], *vdp, c,
993 atype)) != 0) {
994 vdev_free(*vdp);
995 *vdp = NULL;
996 return (error);
997 }
998 }
999
1000 ASSERT(*vdp != NULL);
1001
1002 return (0);
1003}
1004
1005/*
1006 * Opposite of spa_load().
1007 */
1008static void
1009spa_unload(spa_t *spa)
1010{
1011 int i;
1012
1013 ASSERT(MUTEX_HELD(&spa_namespace_lock));
1014
1015 /*
1016 * Stop async tasks.
1017 */
1018 spa_async_suspend(spa);
1019
1020 /*
1021 * Stop syncing.
1022 */
1023 if (spa->spa_sync_on) {
1024 txg_sync_stop(spa->spa_dsl_pool);
1025 spa->spa_sync_on = B_FALSE;
1026 }
1027
1028 /*
1029 * Wait for any outstanding async I/O to complete.
1030 */
1031 if (spa->spa_async_zio_root != NULL) {
1032 (void) zio_wait(spa->spa_async_zio_root);
1033 spa->spa_async_zio_root = NULL;
1034 }
1035
1036 bpobj_close(&spa->spa_deferred_bpobj);
1037
1038 /*
1039 * Close the dsl pool.
1040 */
1041 if (spa->spa_dsl_pool) {
1042 dsl_pool_close(spa->spa_dsl_pool);
1043 spa->spa_dsl_pool = NULL;
1044 spa->spa_meta_objset = NULL;
1045 }
1046
1047 ddt_unload(spa);
1048
1049 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
1050
1051 /*
1052 * Drop and purge level 2 cache
1053 */
1054 spa_l2cache_drop(spa);
1055
1056 /*
1057 * Close all vdevs.
1058 */
1059 if (spa->spa_root_vdev)
1060 vdev_free(spa->spa_root_vdev);
1061 ASSERT(spa->spa_root_vdev == NULL);
1062
1063 for (i = 0; i < spa->spa_spares.sav_count; i++)
1064 vdev_free(spa->spa_spares.sav_vdevs[i]);
1065 if (spa->spa_spares.sav_vdevs) {
1066 kmem_free(spa->spa_spares.sav_vdevs,
1067 spa->spa_spares.sav_count * sizeof (void *));
1068 spa->spa_spares.sav_vdevs = NULL;
1069 }
1070 if (spa->spa_spares.sav_config) {
1071 nvlist_free(spa->spa_spares.sav_config);
1072 spa->spa_spares.sav_config = NULL;
1073 }
1074 spa->spa_spares.sav_count = 0;
1075
1076 for (i = 0; i < spa->spa_l2cache.sav_count; i++)
1076 for (i = 0; i < spa->spa_l2cache.sav_count; i++) {
1077 vdev_clear_stats(spa->spa_l2cache.sav_vdevs[i]);
1078 vdev_free(spa->spa_l2cache.sav_vdevs[i]);
1079 }
1080 if (spa->spa_l2cache.sav_vdevs) {
1081 kmem_free(spa->spa_l2cache.sav_vdevs,
1082 spa->spa_l2cache.sav_count * sizeof (void *));
1083 spa->spa_l2cache.sav_vdevs = NULL;
1084 }
1085 if (spa->spa_l2cache.sav_config) {
1086 nvlist_free(spa->spa_l2cache.sav_config);
1087 spa->spa_l2cache.sav_config = NULL;
1088 }
1089 spa->spa_l2cache.sav_count = 0;
1090
1091 spa->spa_async_suspended = 0;
1092
1093 if (spa->spa_comment != NULL) {
1094 spa_strfree(spa->spa_comment);
1095 spa->spa_comment = NULL;
1096 }
1097
1098 spa_config_exit(spa, SCL_ALL, FTAG);
1099}
1100
1101/*
1102 * Load (or re-load) the current list of vdevs describing the active spares for
1103 * this pool. When this is called, we have some form of basic information in
1104 * 'spa_spares.sav_config'. We parse this into vdevs, try to open them, and
1105 * then re-generate a more complete list including status information.
1106 */
1107static void
1108spa_load_spares(spa_t *spa)
1109{
1110 nvlist_t **spares;
1111 uint_t nspares;
1112 int i;
1113 vdev_t *vd, *tvd;
1114
1115 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL);
1116
1117 /*
1118 * First, close and free any existing spare vdevs.
1119 */
1120 for (i = 0; i < spa->spa_spares.sav_count; i++) {
1121 vd = spa->spa_spares.sav_vdevs[i];
1122
1123 /* Undo the call to spa_activate() below */
1124 if ((tvd = spa_lookup_by_guid(spa, vd->vdev_guid,
1125 B_FALSE)) != NULL && tvd->vdev_isspare)
1126 spa_spare_remove(tvd);
1127 vdev_close(vd);
1128 vdev_free(vd);
1129 }
1130
1131 if (spa->spa_spares.sav_vdevs)
1132 kmem_free(spa->spa_spares.sav_vdevs,
1133 spa->spa_spares.sav_count * sizeof (void *));
1134
1135 if (spa->spa_spares.sav_config == NULL)
1136 nspares = 0;
1137 else
1138 VERIFY(nvlist_lookup_nvlist_array(spa->spa_spares.sav_config,
1139 ZPOOL_CONFIG_SPARES, &spares, &nspares) == 0);
1140
1141 spa->spa_spares.sav_count = (int)nspares;
1142 spa->spa_spares.sav_vdevs = NULL;
1143
1144 if (nspares == 0)
1145 return;
1146
1147 /*
1148 * Construct the array of vdevs, opening them to get status in the
1149 * process. For each spare, there is potentially two different vdev_t
1150 * structures associated with it: one in the list of spares (used only
1151 * for basic validation purposes) and one in the active vdev
1152 * configuration (if it's spared in). During this phase we open and
1153 * validate each vdev on the spare list. If the vdev also exists in the
1154 * active configuration, then we also mark this vdev as an active spare.
1155 */
1156 spa->spa_spares.sav_vdevs = kmem_alloc(nspares * sizeof (void *),
1157 KM_SLEEP);
1158 for (i = 0; i < spa->spa_spares.sav_count; i++) {
1159 VERIFY(spa_config_parse(spa, &vd, spares[i], NULL, 0,
1160 VDEV_ALLOC_SPARE) == 0);
1161 ASSERT(vd != NULL);
1162
1163 spa->spa_spares.sav_vdevs[i] = vd;
1164
1165 if ((tvd = spa_lookup_by_guid(spa, vd->vdev_guid,
1166 B_FALSE)) != NULL) {
1167 if (!tvd->vdev_isspare)
1168 spa_spare_add(tvd);
1169
1170 /*
1171 * We only mark the spare active if we were successfully
1172 * able to load the vdev. Otherwise, importing a pool
1173 * with a bad active spare would result in strange
1174 * behavior, because multiple pool would think the spare
1175 * is actively in use.
1176 *
1177 * There is a vulnerability here to an equally bizarre
1178 * circumstance, where a dead active spare is later
1179 * brought back to life (onlined or otherwise). Given
1180 * the rarity of this scenario, and the extra complexity
1181 * it adds, we ignore the possibility.
1182 */
1183 if (!vdev_is_dead(tvd))
1184 spa_spare_activate(tvd);
1185 }
1186
1187 vd->vdev_top = vd;
1188 vd->vdev_aux = &spa->spa_spares;
1189
1190 if (vdev_open(vd) != 0)
1191 continue;
1192
1193 if (vdev_validate_aux(vd) == 0)
1194 spa_spare_add(vd);
1195 }
1196
1197 /*
1198 * Recompute the stashed list of spares, with status information
1199 * this time.
1200 */
1201 VERIFY(nvlist_remove(spa->spa_spares.sav_config, ZPOOL_CONFIG_SPARES,
1202 DATA_TYPE_NVLIST_ARRAY) == 0);
1203
1204 spares = kmem_alloc(spa->spa_spares.sav_count * sizeof (void *),
1205 KM_SLEEP);
1206 for (i = 0; i < spa->spa_spares.sav_count; i++)
1207 spares[i] = vdev_config_generate(spa,
1208 spa->spa_spares.sav_vdevs[i], B_TRUE, VDEV_CONFIG_SPARE);
1209 VERIFY(nvlist_add_nvlist_array(spa->spa_spares.sav_config,
1210 ZPOOL_CONFIG_SPARES, spares, spa->spa_spares.sav_count) == 0);
1211 for (i = 0; i < spa->spa_spares.sav_count; i++)
1212 nvlist_free(spares[i]);
1213 kmem_free(spares, spa->spa_spares.sav_count * sizeof (void *));
1214}
1215
1216/*
1217 * Load (or re-load) the current list of vdevs describing the active l2cache for
1218 * this pool. When this is called, we have some form of basic information in
1219 * 'spa_l2cache.sav_config'. We parse this into vdevs, try to open them, and
1220 * then re-generate a more complete list including status information.
1221 * Devices which are already active have their details maintained, and are
1222 * not re-opened.
1223 */
1224static void
1225spa_load_l2cache(spa_t *spa)
1226{
1227 nvlist_t **l2cache;
1228 uint_t nl2cache;
1229 int i, j, oldnvdevs;
1230 uint64_t guid;
1231 vdev_t *vd, **oldvdevs, **newvdevs;
1232 spa_aux_vdev_t *sav = &spa->spa_l2cache;
1233
1234 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL);
1235
1236 if (sav->sav_config != NULL) {
1237 VERIFY(nvlist_lookup_nvlist_array(sav->sav_config,
1238 ZPOOL_CONFIG_L2CACHE, &l2cache, &nl2cache) == 0);
1239 newvdevs = kmem_alloc(nl2cache * sizeof (void *), KM_SLEEP);
1240 } else {
1241 nl2cache = 0;
1242 }
1243
1244 oldvdevs = sav->sav_vdevs;
1245 oldnvdevs = sav->sav_count;
1246 sav->sav_vdevs = NULL;
1247 sav->sav_count = 0;
1248
1249 /*
1250 * Process new nvlist of vdevs.
1251 */
1252 for (i = 0; i < nl2cache; i++) {
1253 VERIFY(nvlist_lookup_uint64(l2cache[i], ZPOOL_CONFIG_GUID,
1254 &guid) == 0);
1255
1256 newvdevs[i] = NULL;
1257 for (j = 0; j < oldnvdevs; j++) {
1258 vd = oldvdevs[j];
1259 if (vd != NULL && guid == vd->vdev_guid) {
1260 /*
1261 * Retain previous vdev for add/remove ops.
1262 */
1263 newvdevs[i] = vd;
1264 oldvdevs[j] = NULL;
1265 break;
1266 }
1267 }
1268
1269 if (newvdevs[i] == NULL) {
1270 /*
1271 * Create new vdev
1272 */
1273 VERIFY(spa_config_parse(spa, &vd, l2cache[i], NULL, 0,
1274 VDEV_ALLOC_L2CACHE) == 0);
1275 ASSERT(vd != NULL);
1276 newvdevs[i] = vd;
1277
1278 /*
1279 * Commit this vdev as an l2cache device,
1280 * even if it fails to open.
1281 */
1282 spa_l2cache_add(vd);
1283
1284 vd->vdev_top = vd;
1285 vd->vdev_aux = sav;
1286
1287 spa_l2cache_activate(vd);
1288
1289 if (vdev_open(vd) != 0)
1290 continue;
1291
1292 (void) vdev_validate_aux(vd);
1293
1294 if (!vdev_is_dead(vd))
1295 l2arc_add_vdev(spa, vd);
1296 }
1297 }
1298
1299 /*
1300 * Purge vdevs that were dropped
1301 */
1302 for (i = 0; i < oldnvdevs; i++) {
1303 uint64_t pool;
1304
1305 vd = oldvdevs[i];
1306 if (vd != NULL) {
1307 ASSERT(vd->vdev_isl2cache);
1308
1309 if (spa_l2cache_exists(vd->vdev_guid, &pool) &&
1310 pool != 0ULL && l2arc_vdev_present(vd))
1311 l2arc_remove_vdev(vd);
1308 (void) vdev_close(vd);
1309 spa_l2cache_remove(vd);
1312 vdev_clear_stats(vd);
1313 vdev_free(vd);
1314 }
1315 }
1316
1317 if (oldvdevs)
1318 kmem_free(oldvdevs, oldnvdevs * sizeof (void *));
1319
1320 if (sav->sav_config == NULL)
1321 goto out;
1322
1323 sav->sav_vdevs = newvdevs;
1324 sav->sav_count = (int)nl2cache;
1325
1326 /*
1327 * Recompute the stashed list of l2cache devices, with status
1328 * information this time.
1329 */
1330 VERIFY(nvlist_remove(sav->sav_config, ZPOOL_CONFIG_L2CACHE,
1331 DATA_TYPE_NVLIST_ARRAY) == 0);
1332
1333 l2cache = kmem_alloc(sav->sav_count * sizeof (void *), KM_SLEEP);
1334 for (i = 0; i < sav->sav_count; i++)
1335 l2cache[i] = vdev_config_generate(spa,
1336 sav->sav_vdevs[i], B_TRUE, VDEV_CONFIG_L2CACHE);
1337 VERIFY(nvlist_add_nvlist_array(sav->sav_config,
1338 ZPOOL_CONFIG_L2CACHE, l2cache, sav->sav_count) == 0);
1339out:
1340 for (i = 0; i < sav->sav_count; i++)
1341 nvlist_free(l2cache[i]);
1342 if (sav->sav_count)
1343 kmem_free(l2cache, sav->sav_count * sizeof (void *));
1344}
1345
1346static int
1347load_nvlist(spa_t *spa, uint64_t obj, nvlist_t **value)
1348{
1349 dmu_buf_t *db;
1350 char *packed = NULL;
1351 size_t nvsize = 0;
1352 int error;
1353 *value = NULL;
1354
1355 VERIFY(0 == dmu_bonus_hold(spa->spa_meta_objset, obj, FTAG, &db));
1356 nvsize = *(uint64_t *)db->db_data;
1357 dmu_buf_rele(db, FTAG);
1358
1359 packed = kmem_alloc(nvsize, KM_SLEEP);
1360 error = dmu_read(spa->spa_meta_objset, obj, 0, nvsize, packed,
1361 DMU_READ_PREFETCH);
1362 if (error == 0)
1363 error = nvlist_unpack(packed, nvsize, value, 0);
1364 kmem_free(packed, nvsize);
1365
1366 return (error);
1367}
1368
1369/*
1370 * Checks to see if the given vdev could not be opened, in which case we post a
1371 * sysevent to notify the autoreplace code that the device has been removed.
1372 */
1373static void
1374spa_check_removed(vdev_t *vd)
1375{
1376 for (int c = 0; c < vd->vdev_children; c++)
1377 spa_check_removed(vd->vdev_child[c]);
1378
1379 if (vd->vdev_ops->vdev_op_leaf && vdev_is_dead(vd)) {
1380 zfs_post_autoreplace(vd->vdev_spa, vd);
1381 spa_event_notify(vd->vdev_spa, vd, ESC_ZFS_VDEV_CHECK);
1382 }
1383}
1384
1385/*
1386 * Validate the current config against the MOS config
1387 */
1388static boolean_t
1389spa_config_valid(spa_t *spa, nvlist_t *config)
1390{
1391 vdev_t *mrvd, *rvd = spa->spa_root_vdev;
1392 nvlist_t *nv;
1393
1394 VERIFY(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, &nv) == 0);
1395
1396 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
1397 VERIFY(spa_config_parse(spa, &mrvd, nv, NULL, 0, VDEV_ALLOC_LOAD) == 0);
1398
1399 ASSERT3U(rvd->vdev_children, ==, mrvd->vdev_children);
1400
1401 /*
1402 * If we're doing a normal import, then build up any additional
1403 * diagnostic information about missing devices in this config.
1404 * We'll pass this up to the user for further processing.
1405 */
1406 if (!(spa->spa_import_flags & ZFS_IMPORT_MISSING_LOG)) {
1407 nvlist_t **child, *nv;
1408 uint64_t idx = 0;
1409
1410 child = kmem_alloc(rvd->vdev_children * sizeof (nvlist_t **),
1411 KM_SLEEP);
1412 VERIFY(nvlist_alloc(&nv, NV_UNIQUE_NAME, KM_SLEEP) == 0);
1413
1414 for (int c = 0; c < rvd->vdev_children; c++) {
1415 vdev_t *tvd = rvd->vdev_child[c];
1416 vdev_t *mtvd = mrvd->vdev_child[c];
1417
1418 if (tvd->vdev_ops == &vdev_missing_ops &&
1419 mtvd->vdev_ops != &vdev_missing_ops &&
1420 mtvd->vdev_islog)
1421 child[idx++] = vdev_config_generate(spa, mtvd,
1422 B_FALSE, 0);
1423 }
1424
1425 if (idx) {
1426 VERIFY(nvlist_add_nvlist_array(nv,
1427 ZPOOL_CONFIG_CHILDREN, child, idx) == 0);
1428 VERIFY(nvlist_add_nvlist(spa->spa_load_info,
1429 ZPOOL_CONFIG_MISSING_DEVICES, nv) == 0);
1430
1431 for (int i = 0; i < idx; i++)
1432 nvlist_free(child[i]);
1433 }
1434 nvlist_free(nv);
1435 kmem_free(child, rvd->vdev_children * sizeof (char **));
1436 }
1437
1438 /*
1439 * Compare the root vdev tree with the information we have
1440 * from the MOS config (mrvd). Check each top-level vdev
1441 * with the corresponding MOS config top-level (mtvd).
1442 */
1443 for (int c = 0; c < rvd->vdev_children; c++) {
1444 vdev_t *tvd = rvd->vdev_child[c];
1445 vdev_t *mtvd = mrvd->vdev_child[c];
1446
1447 /*
1448 * Resolve any "missing" vdevs in the current configuration.
1449 * If we find that the MOS config has more accurate information
1450 * about the top-level vdev then use that vdev instead.
1451 */
1452 if (tvd->vdev_ops == &vdev_missing_ops &&
1453 mtvd->vdev_ops != &vdev_missing_ops) {
1454
1455 if (!(spa->spa_import_flags & ZFS_IMPORT_MISSING_LOG))
1456 continue;
1457
1458 /*
1459 * Device specific actions.
1460 */
1461 if (mtvd->vdev_islog) {
1462 spa_set_log_state(spa, SPA_LOG_CLEAR);
1463 } else {
1464 /*
1465 * XXX - once we have 'readonly' pool
1466 * support we should be able to handle
1467 * missing data devices by transitioning
1468 * the pool to readonly.
1469 */
1470 continue;
1471 }
1472
1473 /*
1474 * Swap the missing vdev with the data we were
1475 * able to obtain from the MOS config.
1476 */
1477 vdev_remove_child(rvd, tvd);
1478 vdev_remove_child(mrvd, mtvd);
1479
1480 vdev_add_child(rvd, mtvd);
1481 vdev_add_child(mrvd, tvd);
1482
1483 spa_config_exit(spa, SCL_ALL, FTAG);
1484 vdev_load(mtvd);
1485 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
1486
1487 vdev_reopen(rvd);
1488 } else if (mtvd->vdev_islog) {
1489 /*
1490 * Load the slog device's state from the MOS config
1491 * since it's possible that the label does not
1492 * contain the most up-to-date information.
1493 */
1494 vdev_load_log_state(tvd, mtvd);
1495 vdev_reopen(tvd);
1496 }
1497 }
1498 vdev_free(mrvd);
1499 spa_config_exit(spa, SCL_ALL, FTAG);
1500
1501 /*
1502 * Ensure we were able to validate the config.
1503 */
1504 return (rvd->vdev_guid_sum == spa->spa_uberblock.ub_guid_sum);
1505}
1506
1507/*
1508 * Check for missing log devices
1509 */
1510static int
1511spa_check_logs(spa_t *spa)
1512{
1513 switch (spa->spa_log_state) {
1514 case SPA_LOG_MISSING:
1515 /* need to recheck in case slog has been restored */
1516 case SPA_LOG_UNKNOWN:
1517 if (dmu_objset_find(spa->spa_name, zil_check_log_chain, NULL,
1518 DS_FIND_CHILDREN)) {
1519 spa_set_log_state(spa, SPA_LOG_MISSING);
1520 return (1);
1521 }
1522 break;
1523 }
1524 return (0);
1525}
1526
1527static boolean_t
1528spa_passivate_log(spa_t *spa)
1529{
1530 vdev_t *rvd = spa->spa_root_vdev;
1531 boolean_t slog_found = B_FALSE;
1532
1533 ASSERT(spa_config_held(spa, SCL_ALLOC, RW_WRITER));
1534
1535 if (!spa_has_slogs(spa))
1536 return (B_FALSE);
1537
1538 for (int c = 0; c < rvd->vdev_children; c++) {
1539 vdev_t *tvd = rvd->vdev_child[c];
1540 metaslab_group_t *mg = tvd->vdev_mg;
1541
1542 if (tvd->vdev_islog) {
1543 metaslab_group_passivate(mg);
1544 slog_found = B_TRUE;
1545 }
1546 }
1547
1548 return (slog_found);
1549}
1550
1551static void
1552spa_activate_log(spa_t *spa)
1553{
1554 vdev_t *rvd = spa->spa_root_vdev;
1555
1556 ASSERT(spa_config_held(spa, SCL_ALLOC, RW_WRITER));
1557
1558 for (int c = 0; c < rvd->vdev_children; c++) {
1559 vdev_t *tvd = rvd->vdev_child[c];
1560 metaslab_group_t *mg = tvd->vdev_mg;
1561
1562 if (tvd->vdev_islog)
1563 metaslab_group_activate(mg);
1564 }
1565}
1566
1567int
1568spa_offline_log(spa_t *spa)
1569{
1570 int error = 0;
1571
1572 if ((error = dmu_objset_find(spa_name(spa), zil_vdev_offline,
1573 NULL, DS_FIND_CHILDREN)) == 0) {
1574
1575 /*
1576 * We successfully offlined the log device, sync out the
1577 * current txg so that the "stubby" block can be removed
1578 * by zil_sync().
1579 */
1580 txg_wait_synced(spa->spa_dsl_pool, 0);
1581 }
1582 return (error);
1583}
1584
1585static void
1586spa_aux_check_removed(spa_aux_vdev_t *sav)
1587{
1588 int i;
1589
1590 for (i = 0; i < sav->sav_count; i++)
1591 spa_check_removed(sav->sav_vdevs[i]);
1592}
1593
1594void
1595spa_claim_notify(zio_t *zio)
1596{
1597 spa_t *spa = zio->io_spa;
1598
1599 if (zio->io_error)
1600 return;
1601
1602 mutex_enter(&spa->spa_props_lock); /* any mutex will do */
1603 if (spa->spa_claim_max_txg < zio->io_bp->blk_birth)
1604 spa->spa_claim_max_txg = zio->io_bp->blk_birth;
1605 mutex_exit(&spa->spa_props_lock);
1606}
1607
1608typedef struct spa_load_error {
1609 uint64_t sle_meta_count;
1610 uint64_t sle_data_count;
1611} spa_load_error_t;
1612
1613static void
1614spa_load_verify_done(zio_t *zio)
1615{
1616 blkptr_t *bp = zio->io_bp;
1617 spa_load_error_t *sle = zio->io_private;
1618 dmu_object_type_t type = BP_GET_TYPE(bp);
1619 int error = zio->io_error;
1620
1621 if (error) {
1622 if ((BP_GET_LEVEL(bp) != 0 || dmu_ot[type].ot_metadata) &&
1623 type != DMU_OT_INTENT_LOG)
1624 atomic_add_64(&sle->sle_meta_count, 1);
1625 else
1626 atomic_add_64(&sle->sle_data_count, 1);
1627 }
1628 zio_data_buf_free(zio->io_data, zio->io_size);
1629}
1630
1631/*ARGSUSED*/
1632static int
1633spa_load_verify_cb(spa_t *spa, zilog_t *zilog, const blkptr_t *bp,
1634 arc_buf_t *pbuf, const zbookmark_t *zb, const dnode_phys_t *dnp, void *arg)
1635{
1636 if (bp != NULL) {
1637 zio_t *rio = arg;
1638 size_t size = BP_GET_PSIZE(bp);
1639 void *data = zio_data_buf_alloc(size);
1640
1641 zio_nowait(zio_read(rio, spa, bp, data, size,
1642 spa_load_verify_done, rio->io_private, ZIO_PRIORITY_SCRUB,
1643 ZIO_FLAG_SPECULATIVE | ZIO_FLAG_CANFAIL |
1644 ZIO_FLAG_SCRUB | ZIO_FLAG_RAW, zb));
1645 }
1646 return (0);
1647}
1648
1649static int
1650spa_load_verify(spa_t *spa)
1651{
1652 zio_t *rio;
1653 spa_load_error_t sle = { 0 };
1654 zpool_rewind_policy_t policy;
1655 boolean_t verify_ok = B_FALSE;
1656 int error;
1657
1658 zpool_get_rewind_policy(spa->spa_config, &policy);
1659
1660 if (policy.zrp_request & ZPOOL_NEVER_REWIND)
1661 return (0);
1662
1663 rio = zio_root(spa, NULL, &sle,
1664 ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE);
1665
1666 error = traverse_pool(spa, spa->spa_verify_min_txg,
1667 TRAVERSE_PRE | TRAVERSE_PREFETCH, spa_load_verify_cb, rio);
1668
1669 (void) zio_wait(rio);
1670
1671 spa->spa_load_meta_errors = sle.sle_meta_count;
1672 spa->spa_load_data_errors = sle.sle_data_count;
1673
1674 if (!error && sle.sle_meta_count <= policy.zrp_maxmeta &&
1675 sle.sle_data_count <= policy.zrp_maxdata) {
1676 int64_t loss = 0;
1677
1678 verify_ok = B_TRUE;
1679 spa->spa_load_txg = spa->spa_uberblock.ub_txg;
1680 spa->spa_load_txg_ts = spa->spa_uberblock.ub_timestamp;
1681
1682 loss = spa->spa_last_ubsync_txg_ts - spa->spa_load_txg_ts;
1683 VERIFY(nvlist_add_uint64(spa->spa_load_info,
1684 ZPOOL_CONFIG_LOAD_TIME, spa->spa_load_txg_ts) == 0);
1685 VERIFY(nvlist_add_int64(spa->spa_load_info,
1686 ZPOOL_CONFIG_REWIND_TIME, loss) == 0);
1687 VERIFY(nvlist_add_uint64(spa->spa_load_info,
1688 ZPOOL_CONFIG_LOAD_DATA_ERRORS, sle.sle_data_count) == 0);
1689 } else {
1690 spa->spa_load_max_txg = spa->spa_uberblock.ub_txg;
1691 }
1692
1693 if (error) {
1694 if (error != ENXIO && error != EIO)
1695 error = EIO;
1696 return (error);
1697 }
1698
1699 return (verify_ok ? 0 : EIO);
1700}
1701
1702/*
1703 * Find a value in the pool props object.
1704 */
1705static void
1706spa_prop_find(spa_t *spa, zpool_prop_t prop, uint64_t *val)
1707{
1708 (void) zap_lookup(spa->spa_meta_objset, spa->spa_pool_props_object,
1709 zpool_prop_to_name(prop), sizeof (uint64_t), 1, val);
1710}
1711
1712/*
1713 * Find a value in the pool directory object.
1714 */
1715static int
1716spa_dir_prop(spa_t *spa, const char *name, uint64_t *val)
1717{
1718 return (zap_lookup(spa->spa_meta_objset, DMU_POOL_DIRECTORY_OBJECT,
1719 name, sizeof (uint64_t), 1, val));
1720}
1721
1722static int
1723spa_vdev_err(vdev_t *vdev, vdev_aux_t aux, int err)
1724{
1725 vdev_set_state(vdev, B_TRUE, VDEV_STATE_CANT_OPEN, aux);
1726 return (err);
1727}
1728
1729/*
1730 * Fix up config after a partly-completed split. This is done with the
1731 * ZPOOL_CONFIG_SPLIT nvlist. Both the splitting pool and the split-off
1732 * pool have that entry in their config, but only the splitting one contains
1733 * a list of all the guids of the vdevs that are being split off.
1734 *
1735 * This function determines what to do with that list: either rejoin
1736 * all the disks to the pool, or complete the splitting process. To attempt
1737 * the rejoin, each disk that is offlined is marked online again, and
1738 * we do a reopen() call. If the vdev label for every disk that was
1739 * marked online indicates it was successfully split off (VDEV_AUX_SPLIT_POOL)
1740 * then we call vdev_split() on each disk, and complete the split.
1741 *
1742 * Otherwise we leave the config alone, with all the vdevs in place in
1743 * the original pool.
1744 */
1745static void
1746spa_try_repair(spa_t *spa, nvlist_t *config)
1747{
1748 uint_t extracted;
1749 uint64_t *glist;
1750 uint_t i, gcount;
1751 nvlist_t *nvl;
1752 vdev_t **vd;
1753 boolean_t attempt_reopen;
1754
1755 if (nvlist_lookup_nvlist(config, ZPOOL_CONFIG_SPLIT, &nvl) != 0)
1756 return;
1757
1758 /* check that the config is complete */
1759 if (nvlist_lookup_uint64_array(nvl, ZPOOL_CONFIG_SPLIT_LIST,
1760 &glist, &gcount) != 0)
1761 return;
1762
1763 vd = kmem_zalloc(gcount * sizeof (vdev_t *), KM_SLEEP);
1764
1765 /* attempt to online all the vdevs & validate */
1766 attempt_reopen = B_TRUE;
1767 for (i = 0; i < gcount; i++) {
1768 if (glist[i] == 0) /* vdev is hole */
1769 continue;
1770
1771 vd[i] = spa_lookup_by_guid(spa, glist[i], B_FALSE);
1772 if (vd[i] == NULL) {
1773 /*
1774 * Don't bother attempting to reopen the disks;
1775 * just do the split.
1776 */
1777 attempt_reopen = B_FALSE;
1778 } else {
1779 /* attempt to re-online it */
1780 vd[i]->vdev_offline = B_FALSE;
1781 }
1782 }
1783
1784 if (attempt_reopen) {
1785 vdev_reopen(spa->spa_root_vdev);
1786
1787 /* check each device to see what state it's in */
1788 for (extracted = 0, i = 0; i < gcount; i++) {
1789 if (vd[i] != NULL &&
1790 vd[i]->vdev_stat.vs_aux != VDEV_AUX_SPLIT_POOL)
1791 break;
1792 ++extracted;
1793 }
1794 }
1795
1796 /*
1797 * If every disk has been moved to the new pool, or if we never
1798 * even attempted to look at them, then we split them off for
1799 * good.
1800 */
1801 if (!attempt_reopen || gcount == extracted) {
1802 for (i = 0; i < gcount; i++)
1803 if (vd[i] != NULL)
1804 vdev_split(vd[i]);
1805 vdev_reopen(spa->spa_root_vdev);
1806 }
1807
1808 kmem_free(vd, gcount * sizeof (vdev_t *));
1809}
1810
1811static int
1812spa_load(spa_t *spa, spa_load_state_t state, spa_import_type_t type,
1813 boolean_t mosconfig)
1814{
1815 nvlist_t *config = spa->spa_config;
1816 char *ereport = FM_EREPORT_ZFS_POOL;
1817 char *comment;
1818 int error;
1819 uint64_t pool_guid;
1820 nvlist_t *nvl;
1821
1822 if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID, &pool_guid))
1823 return (EINVAL);
1824
1825 ASSERT(spa->spa_comment == NULL);
1826 if (nvlist_lookup_string(config, ZPOOL_CONFIG_COMMENT, &comment) == 0)
1827 spa->spa_comment = spa_strdup(comment);
1828
1829 /*
1830 * Versioning wasn't explicitly added to the label until later, so if
1831 * it's not present treat it as the initial version.
1832 */
1833 if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_VERSION,
1834 &spa->spa_ubsync.ub_version) != 0)
1835 spa->spa_ubsync.ub_version = SPA_VERSION_INITIAL;
1836
1837 (void) nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_TXG,
1838 &spa->spa_config_txg);
1839
1840 if ((state == SPA_LOAD_IMPORT || state == SPA_LOAD_TRYIMPORT) &&
1841 spa_guid_exists(pool_guid, 0)) {
1842 error = EEXIST;
1843 } else {
1844 spa->spa_config_guid = pool_guid;
1845
1846 if (nvlist_lookup_nvlist(config, ZPOOL_CONFIG_SPLIT,
1847 &nvl) == 0) {
1848 VERIFY(nvlist_dup(nvl, &spa->spa_config_splitting,
1849 KM_SLEEP) == 0);
1850 }
1851
1852 gethrestime(&spa->spa_loaded_ts);
1853 error = spa_load_impl(spa, pool_guid, config, state, type,
1854 mosconfig, &ereport);
1855 }
1856
1857 spa->spa_minref = refcount_count(&spa->spa_refcount);
1858 if (error) {
1859 if (error != EEXIST) {
1860 spa->spa_loaded_ts.tv_sec = 0;
1861 spa->spa_loaded_ts.tv_nsec = 0;
1862 }
1863 if (error != EBADF) {
1864 zfs_ereport_post(ereport, spa, NULL, NULL, 0, 0);
1865 }
1866 }
1867 spa->spa_load_state = error ? SPA_LOAD_ERROR : SPA_LOAD_NONE;
1868 spa->spa_ena = 0;
1869
1870 return (error);
1871}
1872
1873/*
1874 * Load an existing storage pool, using the pool's builtin spa_config as a
1875 * source of configuration information.
1876 */
1877static int
1878spa_load_impl(spa_t *spa, uint64_t pool_guid, nvlist_t *config,
1879 spa_load_state_t state, spa_import_type_t type, boolean_t mosconfig,
1880 char **ereport)
1881{
1882 int error = 0;
1883 nvlist_t *nvroot = NULL;
1884 vdev_t *rvd;
1885 uberblock_t *ub = &spa->spa_uberblock;
1886 uint64_t children, config_cache_txg = spa->spa_config_txg;
1887 int orig_mode = spa->spa_mode;
1888 int parse;
1889 uint64_t obj;
1890
1891 /*
1892 * If this is an untrusted config, access the pool in read-only mode.
1893 * This prevents things like resilvering recently removed devices.
1894 */
1895 if (!mosconfig)
1896 spa->spa_mode = FREAD;
1897
1898 ASSERT(MUTEX_HELD(&spa_namespace_lock));
1899
1900 spa->spa_load_state = state;
1901
1902 if (nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, &nvroot))
1903 return (EINVAL);
1904
1905 parse = (type == SPA_IMPORT_EXISTING ?
1906 VDEV_ALLOC_LOAD : VDEV_ALLOC_SPLIT);
1907
1908 /*
1909 * Create "The Godfather" zio to hold all async IOs
1910 */
1911 spa->spa_async_zio_root = zio_root(spa, NULL, NULL,
1912 ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE | ZIO_FLAG_GODFATHER);
1913
1914 /*
1915 * Parse the configuration into a vdev tree. We explicitly set the
1916 * value that will be returned by spa_version() since parsing the
1917 * configuration requires knowing the version number.
1918 */
1919 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
1920 error = spa_config_parse(spa, &rvd, nvroot, NULL, 0, parse);
1921 spa_config_exit(spa, SCL_ALL, FTAG);
1922
1923 if (error != 0)
1924 return (error);
1925
1926 ASSERT(spa->spa_root_vdev == rvd);
1927
1928 if (type != SPA_IMPORT_ASSEMBLE) {
1929 ASSERT(spa_guid(spa) == pool_guid);
1930 }
1931
1932 /*
1933 * Try to open all vdevs, loading each label in the process.
1934 */
1935 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
1936 error = vdev_open(rvd);
1937 spa_config_exit(spa, SCL_ALL, FTAG);
1938 if (error != 0)
1939 return (error);
1940
1941 /*
1942 * We need to validate the vdev labels against the configuration that
1943 * we have in hand, which is dependent on the setting of mosconfig. If
1944 * mosconfig is true then we're validating the vdev labels based on
1945 * that config. Otherwise, we're validating against the cached config
1946 * (zpool.cache) that was read when we loaded the zfs module, and then
1947 * later we will recursively call spa_load() and validate against
1948 * the vdev config.
1949 *
1950 * If we're assembling a new pool that's been split off from an
1951 * existing pool, the labels haven't yet been updated so we skip
1952 * validation for now.
1953 */
1954 if (type != SPA_IMPORT_ASSEMBLE) {
1955 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
1952 error = vdev_validate(rvd);
1956 error = vdev_validate(rvd, mosconfig);
1957 spa_config_exit(spa, SCL_ALL, FTAG);
1958
1959 if (error != 0)
1960 return (error);
1961
1962 if (rvd->vdev_state <= VDEV_STATE_CANT_OPEN)
1963 return (ENXIO);
1964 }
1965
1966 /*
1967 * Find the best uberblock.
1968 */
1969 vdev_uberblock_load(NULL, rvd, ub);
1970
1971 /*
1972 * If we weren't able to find a single valid uberblock, return failure.
1973 */
1974 if (ub->ub_txg == 0)
1975 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, ENXIO));
1976
1977 /*
1978 * If the pool is newer than the code, we can't open it.
1979 */
1980 if (ub->ub_version > SPA_VERSION)
1981 return (spa_vdev_err(rvd, VDEV_AUX_VERSION_NEWER, ENOTSUP));
1982
1983 /*
1984 * If the vdev guid sum doesn't match the uberblock, we have an
1985 * incomplete configuration. We first check to see if the pool
1986 * is aware of the complete config (i.e ZPOOL_CONFIG_VDEV_CHILDREN).
1987 * If it is, defer the vdev_guid_sum check till later so we
1988 * can handle missing vdevs.
1989 */
1990 if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_VDEV_CHILDREN,
1991 &children) != 0 && mosconfig && type != SPA_IMPORT_ASSEMBLE &&
1992 rvd->vdev_guid_sum != ub->ub_guid_sum)
1993 return (spa_vdev_err(rvd, VDEV_AUX_BAD_GUID_SUM, ENXIO));
1994
1995 if (type != SPA_IMPORT_ASSEMBLE && spa->spa_config_splitting) {
1996 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
1997 spa_try_repair(spa, config);
1998 spa_config_exit(spa, SCL_ALL, FTAG);
1999 nvlist_free(spa->spa_config_splitting);
2000 spa->spa_config_splitting = NULL;
2001 }
2002
2003 /*
2004 * Initialize internal SPA structures.
2005 */
2006 spa->spa_state = POOL_STATE_ACTIVE;
2007 spa->spa_ubsync = spa->spa_uberblock;
2008 spa->spa_verify_min_txg = spa->spa_extreme_rewind ?
2009 TXG_INITIAL - 1 : spa_last_synced_txg(spa) - TXG_DEFER_SIZE - 1;
2010 spa->spa_first_txg = spa->spa_last_ubsync_txg ?
2011 spa->spa_last_ubsync_txg : spa_last_synced_txg(spa) + 1;
2012 spa->spa_claim_max_txg = spa->spa_first_txg;
2013 spa->spa_prev_software_version = ub->ub_software_version;
2014
2015 error = dsl_pool_open(spa, spa->spa_first_txg, &spa->spa_dsl_pool);
2016 if (error)
2017 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO));
2018 spa->spa_meta_objset = spa->spa_dsl_pool->dp_meta_objset;
2019
2020 if (spa_dir_prop(spa, DMU_POOL_CONFIG, &spa->spa_config_object) != 0)
2021 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO));
2022
2023 if (!mosconfig) {
2024 uint64_t hostid;
2025 nvlist_t *policy = NULL, *nvconfig;
2026
2027 if (load_nvlist(spa, spa->spa_config_object, &nvconfig) != 0)
2028 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO));
2029
2030 if (!spa_is_root(spa) && nvlist_lookup_uint64(nvconfig,
2031 ZPOOL_CONFIG_HOSTID, &hostid) == 0) {
2032 char *hostname;
2033 unsigned long myhostid = 0;
2034
2035 VERIFY(nvlist_lookup_string(nvconfig,
2036 ZPOOL_CONFIG_HOSTNAME, &hostname) == 0);
2037
2038#ifdef _KERNEL
2039 myhostid = zone_get_hostid(NULL);
2040#else /* _KERNEL */
2041 /*
2042 * We're emulating the system's hostid in userland, so
2043 * we can't use zone_get_hostid().
2044 */
2045 (void) ddi_strtoul(hw_serial, NULL, 10, &myhostid);
2046#endif /* _KERNEL */
2047 if (check_hostid && hostid != 0 && myhostid != 0 &&
2048 hostid != myhostid) {
2049 nvlist_free(nvconfig);
2050 cmn_err(CE_WARN, "pool '%s' could not be "
2051 "loaded as it was last accessed by "
2052 "another system (host: %s hostid: 0x%lx). "
2053 "See: http://www.sun.com/msg/ZFS-8000-EY",
2054 spa_name(spa), hostname,
2055 (unsigned long)hostid);
2056 return (EBADF);
2057 }
2058 }
2059 if (nvlist_lookup_nvlist(spa->spa_config,
2060 ZPOOL_REWIND_POLICY, &policy) == 0)
2061 VERIFY(nvlist_add_nvlist(nvconfig,
2062 ZPOOL_REWIND_POLICY, policy) == 0);
2063
2064 spa_config_set(spa, nvconfig);
2065 spa_unload(spa);
2066 spa_deactivate(spa);
2067 spa_activate(spa, orig_mode);
2068
2069 return (spa_load(spa, state, SPA_IMPORT_EXISTING, B_TRUE));
2070 }
2071
2072 if (spa_dir_prop(spa, DMU_POOL_SYNC_BPOBJ, &obj) != 0)
2073 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO));
2074 error = bpobj_open(&spa->spa_deferred_bpobj, spa->spa_meta_objset, obj);
2075 if (error != 0)
2076 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO));
2077
2078 /*
2079 * Load the bit that tells us to use the new accounting function
2080 * (raid-z deflation). If we have an older pool, this will not
2081 * be present.
2082 */
2083 error = spa_dir_prop(spa, DMU_POOL_DEFLATE, &spa->spa_deflate);
2084 if (error != 0 && error != ENOENT)
2085 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO));
2086
2087 error = spa_dir_prop(spa, DMU_POOL_CREATION_VERSION,
2088 &spa->spa_creation_version);
2089 if (error != 0 && error != ENOENT)
2090 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO));
2091
2092 /*
2093 * Load the persistent error log. If we have an older pool, this will
2094 * not be present.
2095 */
2096 error = spa_dir_prop(spa, DMU_POOL_ERRLOG_LAST, &spa->spa_errlog_last);
2097 if (error != 0 && error != ENOENT)
2098 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO));
2099
2100 error = spa_dir_prop(spa, DMU_POOL_ERRLOG_SCRUB,
2101 &spa->spa_errlog_scrub);
2102 if (error != 0 && error != ENOENT)
2103 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO));
2104
2105 /*
2106 * Load the history object. If we have an older pool, this
2107 * will not be present.
2108 */
2109 error = spa_dir_prop(spa, DMU_POOL_HISTORY, &spa->spa_history);
2110 if (error != 0 && error != ENOENT)
2111 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO));
2112
2113 /*
2114 * If we're assembling the pool from the split-off vdevs of
2115 * an existing pool, we don't want to attach the spares & cache
2116 * devices.
2117 */
2118
2119 /*
2120 * Load any hot spares for this pool.
2121 */
2122 error = spa_dir_prop(spa, DMU_POOL_SPARES, &spa->spa_spares.sav_object);
2123 if (error != 0 && error != ENOENT)
2124 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO));
2125 if (error == 0 && type != SPA_IMPORT_ASSEMBLE) {
2126 ASSERT(spa_version(spa) >= SPA_VERSION_SPARES);
2127 if (load_nvlist(spa, spa->spa_spares.sav_object,
2128 &spa->spa_spares.sav_config) != 0)
2129 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO));
2130
2131 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
2132 spa_load_spares(spa);
2133 spa_config_exit(spa, SCL_ALL, FTAG);
2134 } else if (error == 0) {
2135 spa->spa_spares.sav_sync = B_TRUE;
2136 }
2137
2138 /*
2139 * Load any level 2 ARC devices for this pool.
2140 */
2141 error = spa_dir_prop(spa, DMU_POOL_L2CACHE,
2142 &spa->spa_l2cache.sav_object);
2143 if (error != 0 && error != ENOENT)
2144 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO));
2145 if (error == 0 && type != SPA_IMPORT_ASSEMBLE) {
2146 ASSERT(spa_version(spa) >= SPA_VERSION_L2CACHE);
2147 if (load_nvlist(spa, spa->spa_l2cache.sav_object,
2148 &spa->spa_l2cache.sav_config) != 0)
2149 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO));
2150
2151 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
2152 spa_load_l2cache(spa);
2153 spa_config_exit(spa, SCL_ALL, FTAG);
2154 } else if (error == 0) {
2155 spa->spa_l2cache.sav_sync = B_TRUE;
2156 }
2157
2158 spa->spa_delegation = zpool_prop_default_numeric(ZPOOL_PROP_DELEGATION);
2159
2160 error = spa_dir_prop(spa, DMU_POOL_PROPS, &spa->spa_pool_props_object);
2161 if (error && error != ENOENT)
2162 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO));
2163
2164 if (error == 0) {
2165 uint64_t autoreplace;
2166
2167 spa_prop_find(spa, ZPOOL_PROP_BOOTFS, &spa->spa_bootfs);
2168 spa_prop_find(spa, ZPOOL_PROP_AUTOREPLACE, &autoreplace);
2169 spa_prop_find(spa, ZPOOL_PROP_DELEGATION, &spa->spa_delegation);
2170 spa_prop_find(spa, ZPOOL_PROP_FAILUREMODE, &spa->spa_failmode);
2171 spa_prop_find(spa, ZPOOL_PROP_AUTOEXPAND, &spa->spa_autoexpand);
2172 spa_prop_find(spa, ZPOOL_PROP_DEDUPDITTO,
2173 &spa->spa_dedup_ditto);
2174
2175 spa->spa_autoreplace = (autoreplace != 0);
2176 }
2177
2178 /*
2179 * If the 'autoreplace' property is set, then post a resource notifying
2180 * the ZFS DE that it should not issue any faults for unopenable
2181 * devices. We also iterate over the vdevs, and post a sysevent for any
2182 * unopenable vdevs so that the normal autoreplace handler can take
2183 * over.
2184 */
2185 if (spa->spa_autoreplace && state != SPA_LOAD_TRYIMPORT) {
2186 spa_check_removed(spa->spa_root_vdev);
2187 /*
2188 * For the import case, this is done in spa_import(), because
2189 * at this point we're using the spare definitions from
2190 * the MOS config, not necessarily from the userland config.
2191 */
2192 if (state != SPA_LOAD_IMPORT) {
2193 spa_aux_check_removed(&spa->spa_spares);
2194 spa_aux_check_removed(&spa->spa_l2cache);
2195 }
2196 }
2197
2198 /*
2199 * Load the vdev state for all toplevel vdevs.
2200 */
2201 vdev_load(rvd);
2202
2203 /*
2204 * Propagate the leaf DTLs we just loaded all the way up the tree.
2205 */
2206 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
2207 vdev_dtl_reassess(rvd, 0, 0, B_FALSE);
2208 spa_config_exit(spa, SCL_ALL, FTAG);
2209
2210 /*
2211 * Load the DDTs (dedup tables).
2212 */
2213 error = ddt_load(spa);
2214 if (error != 0)
2215 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO));
2216
2217 spa_update_dspace(spa);
2218
2219 /*
2220 * Validate the config, using the MOS config to fill in any
2221 * information which might be missing. If we fail to validate
2222 * the config then declare the pool unfit for use. If we're
2223 * assembling a pool from a split, the log is not transferred
2224 * over.
2225 */
2226 if (type != SPA_IMPORT_ASSEMBLE) {
2227 nvlist_t *nvconfig;
2228
2229 if (load_nvlist(spa, spa->spa_config_object, &nvconfig) != 0)
2230 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO));
2231
2232 if (!spa_config_valid(spa, nvconfig)) {
2233 nvlist_free(nvconfig);
2234 return (spa_vdev_err(rvd, VDEV_AUX_BAD_GUID_SUM,
2235 ENXIO));
2236 }
2237 nvlist_free(nvconfig);
2238
2239 /*
2240 * Now that we've validate the config, check the state of the
2241 * root vdev. If it can't be opened, it indicates one or
2242 * more toplevel vdevs are faulted.
2243 */
2244 if (rvd->vdev_state <= VDEV_STATE_CANT_OPEN)
2245 return (ENXIO);
2246
2247 if (spa_check_logs(spa)) {
2248 *ereport = FM_EREPORT_ZFS_LOG_REPLAY;
2249 return (spa_vdev_err(rvd, VDEV_AUX_BAD_LOG, ENXIO));
2250 }
2251 }
2252
2253 /*
2254 * We've successfully opened the pool, verify that we're ready
2255 * to start pushing transactions.
2256 */
2257 if (state != SPA_LOAD_TRYIMPORT) {
2258 if (error = spa_load_verify(spa))
2259 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA,
2260 error));
2261 }
2262
2263 if (spa_writeable(spa) && (state == SPA_LOAD_RECOVER ||
2264 spa->spa_load_max_txg == UINT64_MAX)) {
2265 dmu_tx_t *tx;
2266 int need_update = B_FALSE;
2267
2268 ASSERT(state != SPA_LOAD_TRYIMPORT);
2269
2270 /*
2271 * Claim log blocks that haven't been committed yet.
2272 * This must all happen in a single txg.
2273 * Note: spa_claim_max_txg is updated by spa_claim_notify(),
2274 * invoked from zil_claim_log_block()'s i/o done callback.
2275 * Price of rollback is that we abandon the log.
2276 */
2277 spa->spa_claiming = B_TRUE;
2278
2279 tx = dmu_tx_create_assigned(spa_get_dsl(spa),
2280 spa_first_txg(spa));
2281 (void) dmu_objset_find(spa_name(spa),
2282 zil_claim, tx, DS_FIND_CHILDREN);
2283 dmu_tx_commit(tx);
2284
2285 spa->spa_claiming = B_FALSE;
2286
2287 spa_set_log_state(spa, SPA_LOG_GOOD);
2288 spa->spa_sync_on = B_TRUE;
2289 txg_sync_start(spa->spa_dsl_pool);
2290
2291 /*
2292 * Wait for all claims to sync. We sync up to the highest
2293 * claimed log block birth time so that claimed log blocks
2294 * don't appear to be from the future. spa_claim_max_txg
2295 * will have been set for us by either zil_check_log_chain()
2296 * (invoked from spa_check_logs()) or zil_claim() above.
2297 */
2298 txg_wait_synced(spa->spa_dsl_pool, spa->spa_claim_max_txg);
2299
2300 /*
2301 * If the config cache is stale, or we have uninitialized
2302 * metaslabs (see spa_vdev_add()), then update the config.
2303 *
2304 * If this is a verbatim import, trust the current
2305 * in-core spa_config and update the disk labels.
2306 */
2307 if (config_cache_txg != spa->spa_config_txg ||
2308 state == SPA_LOAD_IMPORT ||
2309 state == SPA_LOAD_RECOVER ||
2310 (spa->spa_import_flags & ZFS_IMPORT_VERBATIM))
2311 need_update = B_TRUE;
2312
2313 for (int c = 0; c < rvd->vdev_children; c++)
2314 if (rvd->vdev_child[c]->vdev_ms_array == 0)
2315 need_update = B_TRUE;
2316
2317 /*
2318 * Update the config cache asychronously in case we're the
2319 * root pool, in which case the config cache isn't writable yet.
2320 */
2321 if (need_update)
2322 spa_async_request(spa, SPA_ASYNC_CONFIG_UPDATE);
2323
2324 /*
2325 * Check all DTLs to see if anything needs resilvering.
2326 */
2327 if (!dsl_scan_resilvering(spa->spa_dsl_pool) &&
2328 vdev_resilver_needed(rvd, NULL, NULL))
2329 spa_async_request(spa, SPA_ASYNC_RESILVER);
2330
2331 /*
2332 * Delete any inconsistent datasets.
2333 */
2334 (void) dmu_objset_find(spa_name(spa),
2335 dsl_destroy_inconsistent, NULL, DS_FIND_CHILDREN);
2336
2337 /*
2338 * Clean up any stale temporary dataset userrefs.
2339 */
2340 dsl_pool_clean_tmp_userrefs(spa->spa_dsl_pool);
2341 }
2342
2343 return (0);
2344}
2345
2346static int
2347spa_load_retry(spa_t *spa, spa_load_state_t state, int mosconfig)
2348{
2349 int mode = spa->spa_mode;
2350
2351 spa_unload(spa);
2352 spa_deactivate(spa);
2353
2354 spa->spa_load_max_txg--;
2355
2356 spa_activate(spa, mode);
2357 spa_async_suspend(spa);
2358
2359 return (spa_load(spa, state, SPA_IMPORT_EXISTING, mosconfig));
2360}
2361
2362static int
2363spa_load_best(spa_t *spa, spa_load_state_t state, int mosconfig,
2364 uint64_t max_request, int rewind_flags)
2365{
2366 nvlist_t *config = NULL;
2367 int load_error, rewind_error;
2368 uint64_t safe_rewind_txg;
2369 uint64_t min_txg;
2370
2371 if (spa->spa_load_txg && state == SPA_LOAD_RECOVER) {
2372 spa->spa_load_max_txg = spa->spa_load_txg;
2373 spa_set_log_state(spa, SPA_LOG_CLEAR);
2374 } else {
2375 spa->spa_load_max_txg = max_request;
2376 }
2377
2378 load_error = rewind_error = spa_load(spa, state, SPA_IMPORT_EXISTING,
2379 mosconfig);
2380 if (load_error == 0)
2381 return (0);
2382
2383 if (spa->spa_root_vdev != NULL)
2384 config = spa_config_generate(spa, NULL, -1ULL, B_TRUE);
2385
2386 spa->spa_last_ubsync_txg = spa->spa_uberblock.ub_txg;
2387 spa->spa_last_ubsync_txg_ts = spa->spa_uberblock.ub_timestamp;
2388
2389 if (rewind_flags & ZPOOL_NEVER_REWIND) {
2390 nvlist_free(config);
2391 return (load_error);
2392 }
2393
2394 /* Price of rolling back is discarding txgs, including log */
2395 if (state == SPA_LOAD_RECOVER)
2396 spa_set_log_state(spa, SPA_LOG_CLEAR);
2397
2398 spa->spa_load_max_txg = spa->spa_last_ubsync_txg;
2399 safe_rewind_txg = spa->spa_last_ubsync_txg - TXG_DEFER_SIZE;
2400 min_txg = (rewind_flags & ZPOOL_EXTREME_REWIND) ?
2401 TXG_INITIAL : safe_rewind_txg;
2402
2403 /*
2404 * Continue as long as we're finding errors, we're still within
2405 * the acceptable rewind range, and we're still finding uberblocks
2406 */
2407 while (rewind_error && spa->spa_uberblock.ub_txg >= min_txg &&
2408 spa->spa_uberblock.ub_txg <= spa->spa_load_max_txg) {
2409 if (spa->spa_load_max_txg < safe_rewind_txg)
2410 spa->spa_extreme_rewind = B_TRUE;
2411 rewind_error = spa_load_retry(spa, state, mosconfig);
2412 }
2413
2414 spa->spa_extreme_rewind = B_FALSE;
2415 spa->spa_load_max_txg = UINT64_MAX;
2416
2417 if (config && (rewind_error || state != SPA_LOAD_RECOVER))
2418 spa_config_set(spa, config);
2419
2420 return (state == SPA_LOAD_RECOVER ? rewind_error : load_error);
2421}
2422
2423/*
2424 * Pool Open/Import
2425 *
2426 * The import case is identical to an open except that the configuration is sent
2427 * down from userland, instead of grabbed from the configuration cache. For the
2428 * case of an open, the pool configuration will exist in the
2429 * POOL_STATE_UNINITIALIZED state.
2430 *
2431 * The stats information (gen/count/ustats) is used to gather vdev statistics at
2432 * the same time open the pool, without having to keep around the spa_t in some
2433 * ambiguous state.
2434 */
2435static int
2436spa_open_common(const char *pool, spa_t **spapp, void *tag, nvlist_t *nvpolicy,
2437 nvlist_t **config)
2438{
2439 spa_t *spa;
2440 spa_load_state_t state = SPA_LOAD_OPEN;
2441 int error;
2442 int locked = B_FALSE;
2443 int firstopen = B_FALSE;
2444
2445 *spapp = NULL;
2446
2447 /*
2448 * As disgusting as this is, we need to support recursive calls to this
2449 * function because dsl_dir_open() is called during spa_load(), and ends
2450 * up calling spa_open() again. The real fix is to figure out how to
2451 * avoid dsl_dir_open() calling this in the first place.
2452 */
2453 if (mutex_owner(&spa_namespace_lock) != curthread) {
2454 mutex_enter(&spa_namespace_lock);
2455 locked = B_TRUE;
2456 }
2457
2458 if ((spa = spa_lookup(pool)) == NULL) {
2459 if (locked)
2460 mutex_exit(&spa_namespace_lock);
2461 return (ENOENT);
2462 }
2463
2464 if (spa->spa_state == POOL_STATE_UNINITIALIZED) {
2465 zpool_rewind_policy_t policy;
2466
2467 firstopen = B_TRUE;
2468
2469 zpool_get_rewind_policy(nvpolicy ? nvpolicy : spa->spa_config,
2470 &policy);
2471 if (policy.zrp_request & ZPOOL_DO_REWIND)
2472 state = SPA_LOAD_RECOVER;
2473
2474 spa_activate(spa, spa_mode_global);
2475
2476 if (state != SPA_LOAD_RECOVER)
2477 spa->spa_last_ubsync_txg = spa->spa_load_txg = 0;
2478
2479 error = spa_load_best(spa, state, B_FALSE, policy.zrp_txg,
2480 policy.zrp_request);
2481
2482 if (error == EBADF) {
2483 /*
2484 * If vdev_validate() returns failure (indicated by
2485 * EBADF), it indicates that one of the vdevs indicates
2486 * that the pool has been exported or destroyed. If
2487 * this is the case, the config cache is out of sync and
2488 * we should remove the pool from the namespace.
2489 */
2490 spa_unload(spa);
2491 spa_deactivate(spa);
2492 spa_config_sync(spa, B_TRUE, B_TRUE);
2493 spa_remove(spa);
2494 if (locked)
2495 mutex_exit(&spa_namespace_lock);
2496 return (ENOENT);
2497 }
2498
2499 if (error) {
2500 /*
2501 * We can't open the pool, but we still have useful
2502 * information: the state of each vdev after the
2503 * attempted vdev_open(). Return this to the user.
2504 */
2505 if (config != NULL && spa->spa_config) {
2506 VERIFY(nvlist_dup(spa->spa_config, config,
2507 KM_SLEEP) == 0);
2508 VERIFY(nvlist_add_nvlist(*config,
2509 ZPOOL_CONFIG_LOAD_INFO,
2510 spa->spa_load_info) == 0);
2511 }
2512 spa_unload(spa);
2513 spa_deactivate(spa);
2514 spa->spa_last_open_failed = error;
2515 if (locked)
2516 mutex_exit(&spa_namespace_lock);
2517 *spapp = NULL;
2518 return (error);
2519 }
2520 }
2521
2522 spa_open_ref(spa, tag);
2523
2524 if (config != NULL)
2525 *config = spa_config_generate(spa, NULL, -1ULL, B_TRUE);
2526
2527 /*
2528 * If we've recovered the pool, pass back any information we
2529 * gathered while doing the load.
2530 */
2531 if (state == SPA_LOAD_RECOVER) {
2532 VERIFY(nvlist_add_nvlist(*config, ZPOOL_CONFIG_LOAD_INFO,
2533 spa->spa_load_info) == 0);
2534 }
2535
2536 if (locked) {
2537 spa->spa_last_open_failed = 0;
2538 spa->spa_last_ubsync_txg = 0;
2539 spa->spa_load_txg = 0;
2540 mutex_exit(&spa_namespace_lock);
2541#ifdef __FreeBSD__
2542#ifdef _KERNEL
2543 if (firstopen)
2544 zvol_create_minors(pool);
2545#endif
2546#endif
2547 }
2548
2549 *spapp = spa;
2550
2551 return (0);
2552}
2553
2554int
2555spa_open_rewind(const char *name, spa_t **spapp, void *tag, nvlist_t *policy,
2556 nvlist_t **config)
2557{
2558 return (spa_open_common(name, spapp, tag, policy, config));
2559}
2560
2561int
2562spa_open(const char *name, spa_t **spapp, void *tag)
2563{
2564 return (spa_open_common(name, spapp, tag, NULL, NULL));
2565}
2566
2567/*
2568 * Lookup the given spa_t, incrementing the inject count in the process,
2569 * preventing it from being exported or destroyed.
2570 */
2571spa_t *
2572spa_inject_addref(char *name)
2573{
2574 spa_t *spa;
2575
2576 mutex_enter(&spa_namespace_lock);
2577 if ((spa = spa_lookup(name)) == NULL) {
2578 mutex_exit(&spa_namespace_lock);
2579 return (NULL);
2580 }
2581 spa->spa_inject_ref++;
2582 mutex_exit(&spa_namespace_lock);
2583
2584 return (spa);
2585}
2586
2587void
2588spa_inject_delref(spa_t *spa)
2589{
2590 mutex_enter(&spa_namespace_lock);
2591 spa->spa_inject_ref--;
2592 mutex_exit(&spa_namespace_lock);
2593}
2594
2595/*
2596 * Add spares device information to the nvlist.
2597 */
2598static void
2599spa_add_spares(spa_t *spa, nvlist_t *config)
2600{
2601 nvlist_t **spares;
2602 uint_t i, nspares;
2603 nvlist_t *nvroot;
2604 uint64_t guid;
2605 vdev_stat_t *vs;
2606 uint_t vsc;
2607 uint64_t pool;
2608
2609 ASSERT(spa_config_held(spa, SCL_CONFIG, RW_READER));
2610
2611 if (spa->spa_spares.sav_count == 0)
2612 return;
2613
2614 VERIFY(nvlist_lookup_nvlist(config,
2615 ZPOOL_CONFIG_VDEV_TREE, &nvroot) == 0);
2616 VERIFY(nvlist_lookup_nvlist_array(spa->spa_spares.sav_config,
2617 ZPOOL_CONFIG_SPARES, &spares, &nspares) == 0);
2618 if (nspares != 0) {
2619 VERIFY(nvlist_add_nvlist_array(nvroot,
2620 ZPOOL_CONFIG_SPARES, spares, nspares) == 0);
2621 VERIFY(nvlist_lookup_nvlist_array(nvroot,
2622 ZPOOL_CONFIG_SPARES, &spares, &nspares) == 0);
2623
2624 /*
2625 * Go through and find any spares which have since been
2626 * repurposed as an active spare. If this is the case, update
2627 * their status appropriately.
2628 */
2629 for (i = 0; i < nspares; i++) {
2630 VERIFY(nvlist_lookup_uint64(spares[i],
2631 ZPOOL_CONFIG_GUID, &guid) == 0);
2632 if (spa_spare_exists(guid, &pool, NULL) &&
2633 pool != 0ULL) {
2634 VERIFY(nvlist_lookup_uint64_array(
2635 spares[i], ZPOOL_CONFIG_VDEV_STATS,
2636 (uint64_t **)&vs, &vsc) == 0);
2637 vs->vs_state = VDEV_STATE_CANT_OPEN;
2638 vs->vs_aux = VDEV_AUX_SPARED;
2639 }
2640 }
2641 }
2642}
2643
2644/*
2645 * Add l2cache device information to the nvlist, including vdev stats.
2646 */
2647static void
2648spa_add_l2cache(spa_t *spa, nvlist_t *config)
2649{
2650 nvlist_t **l2cache;
2651 uint_t i, j, nl2cache;
2652 nvlist_t *nvroot;
2653 uint64_t guid;
2654 vdev_t *vd;
2655 vdev_stat_t *vs;
2656 uint_t vsc;
2657
2658 ASSERT(spa_config_held(spa, SCL_CONFIG, RW_READER));
2659
2660 if (spa->spa_l2cache.sav_count == 0)
2661 return;
2662
2663 VERIFY(nvlist_lookup_nvlist(config,
2664 ZPOOL_CONFIG_VDEV_TREE, &nvroot) == 0);
2665 VERIFY(nvlist_lookup_nvlist_array(spa->spa_l2cache.sav_config,
2666 ZPOOL_CONFIG_L2CACHE, &l2cache, &nl2cache) == 0);
2667 if (nl2cache != 0) {
2668 VERIFY(nvlist_add_nvlist_array(nvroot,
2669 ZPOOL_CONFIG_L2CACHE, l2cache, nl2cache) == 0);
2670 VERIFY(nvlist_lookup_nvlist_array(nvroot,
2671 ZPOOL_CONFIG_L2CACHE, &l2cache, &nl2cache) == 0);
2672
2673 /*
2674 * Update level 2 cache device stats.
2675 */
2676
2677 for (i = 0; i < nl2cache; i++) {
2678 VERIFY(nvlist_lookup_uint64(l2cache[i],
2679 ZPOOL_CONFIG_GUID, &guid) == 0);
2680
2681 vd = NULL;
2682 for (j = 0; j < spa->spa_l2cache.sav_count; j++) {
2683 if (guid ==
2684 spa->spa_l2cache.sav_vdevs[j]->vdev_guid) {
2685 vd = spa->spa_l2cache.sav_vdevs[j];
2686 break;
2687 }
2688 }
2689 ASSERT(vd != NULL);
2690
2691 VERIFY(nvlist_lookup_uint64_array(l2cache[i],
2692 ZPOOL_CONFIG_VDEV_STATS, (uint64_t **)&vs, &vsc)
2693 == 0);
2694 vdev_get_stats(vd, vs);
2695 }
2696 }
2697}
2698
2699int
2700spa_get_stats(const char *name, nvlist_t **config, char *altroot, size_t buflen)
2701{
2702 int error;
2703 spa_t *spa;
2704
2705 *config = NULL;
2706 error = spa_open_common(name, &spa, FTAG, NULL, config);
2707
2708 if (spa != NULL) {
2709 /*
2710 * This still leaves a window of inconsistency where the spares
2711 * or l2cache devices could change and the config would be
2712 * self-inconsistent.
2713 */
2714 spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER);
2715
2716 if (*config != NULL) {
2717 uint64_t loadtimes[2];
2718
2719 loadtimes[0] = spa->spa_loaded_ts.tv_sec;
2720 loadtimes[1] = spa->spa_loaded_ts.tv_nsec;
2721 VERIFY(nvlist_add_uint64_array(*config,
2722 ZPOOL_CONFIG_LOADED_TIME, loadtimes, 2) == 0);
2723
2724 VERIFY(nvlist_add_uint64(*config,
2725 ZPOOL_CONFIG_ERRCOUNT,
2726 spa_get_errlog_size(spa)) == 0);
2727
2728 if (spa_suspended(spa))
2729 VERIFY(nvlist_add_uint64(*config,
2730 ZPOOL_CONFIG_SUSPENDED,
2731 spa->spa_failmode) == 0);
2732
2733 spa_add_spares(spa, *config);
2734 spa_add_l2cache(spa, *config);
2735 }
2736 }
2737
2738 /*
2739 * We want to get the alternate root even for faulted pools, so we cheat
2740 * and call spa_lookup() directly.
2741 */
2742 if (altroot) {
2743 if (spa == NULL) {
2744 mutex_enter(&spa_namespace_lock);
2745 spa = spa_lookup(name);
2746 if (spa)
2747 spa_altroot(spa, altroot, buflen);
2748 else
2749 altroot[0] = '\0';
2750 spa = NULL;
2751 mutex_exit(&spa_namespace_lock);
2752 } else {
2753 spa_altroot(spa, altroot, buflen);
2754 }
2755 }
2756
2757 if (spa != NULL) {
2758 spa_config_exit(spa, SCL_CONFIG, FTAG);
2759 spa_close(spa, FTAG);
2760 }
2761
2762 return (error);
2763}
2764
2765/*
2766 * Validate that the auxiliary device array is well formed. We must have an
2767 * array of nvlists, each which describes a valid leaf vdev. If this is an
2768 * import (mode is VDEV_ALLOC_SPARE), then we allow corrupted spares to be
2769 * specified, as long as they are well-formed.
2770 */
2771static int
2772spa_validate_aux_devs(spa_t *spa, nvlist_t *nvroot, uint64_t crtxg, int mode,
2773 spa_aux_vdev_t *sav, const char *config, uint64_t version,
2774 vdev_labeltype_t label)
2775{
2776 nvlist_t **dev;
2777 uint_t i, ndev;
2778 vdev_t *vd;
2779 int error;
2780
2781 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL);
2782
2783 /*
2784 * It's acceptable to have no devs specified.
2785 */
2786 if (nvlist_lookup_nvlist_array(nvroot, config, &dev, &ndev) != 0)
2787 return (0);
2788
2789 if (ndev == 0)
2790 return (EINVAL);
2791
2792 /*
2793 * Make sure the pool is formatted with a version that supports this
2794 * device type.
2795 */
2796 if (spa_version(spa) < version)
2797 return (ENOTSUP);
2798
2799 /*
2800 * Set the pending device list so we correctly handle device in-use
2801 * checking.
2802 */
2803 sav->sav_pending = dev;
2804 sav->sav_npending = ndev;
2805
2806 for (i = 0; i < ndev; i++) {
2807 if ((error = spa_config_parse(spa, &vd, dev[i], NULL, 0,
2808 mode)) != 0)
2809 goto out;
2810
2811 if (!vd->vdev_ops->vdev_op_leaf) {
2812 vdev_free(vd);
2813 error = EINVAL;
2814 goto out;
2815 }
2816
2817 /*
2818 * The L2ARC currently only supports disk devices in
2819 * kernel context. For user-level testing, we allow it.
2820 */
2821#ifdef _KERNEL
2822 if ((strcmp(config, ZPOOL_CONFIG_L2CACHE) == 0) &&
2823 strcmp(vd->vdev_ops->vdev_op_type, VDEV_TYPE_DISK) != 0) {
2824 error = ENOTBLK;
2825 vdev_free(vd);
2826 goto out;
2827 }
2828#endif
2829 vd->vdev_top = vd;
2830
2831 if ((error = vdev_open(vd)) == 0 &&
2832 (error = vdev_label_init(vd, crtxg, label)) == 0) {
2833 VERIFY(nvlist_add_uint64(dev[i], ZPOOL_CONFIG_GUID,
2834 vd->vdev_guid) == 0);
2835 }
2836
2837 vdev_free(vd);
2838
2839 if (error &&
2840 (mode != VDEV_ALLOC_SPARE && mode != VDEV_ALLOC_L2CACHE))
2841 goto out;
2842 else
2843 error = 0;
2844 }
2845
2846out:
2847 sav->sav_pending = NULL;
2848 sav->sav_npending = 0;
2849 return (error);
2850}
2851
2852static int
2853spa_validate_aux(spa_t *spa, nvlist_t *nvroot, uint64_t crtxg, int mode)
2854{
2855 int error;
2856
2857 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL);
2858
2859 if ((error = spa_validate_aux_devs(spa, nvroot, crtxg, mode,
2860 &spa->spa_spares, ZPOOL_CONFIG_SPARES, SPA_VERSION_SPARES,
2861 VDEV_LABEL_SPARE)) != 0) {
2862 return (error);
2863 }
2864
2865 return (spa_validate_aux_devs(spa, nvroot, crtxg, mode,
2866 &spa->spa_l2cache, ZPOOL_CONFIG_L2CACHE, SPA_VERSION_L2CACHE,
2867 VDEV_LABEL_L2CACHE));
2868}
2869
2870static void
2871spa_set_aux_vdevs(spa_aux_vdev_t *sav, nvlist_t **devs, int ndevs,
2872 const char *config)
2873{
2874 int i;
2875
2876 if (sav->sav_config != NULL) {
2877 nvlist_t **olddevs;
2878 uint_t oldndevs;
2879 nvlist_t **newdevs;
2880
2881 /*
2882 * Generate new dev list by concatentating with the
2883 * current dev list.
2884 */
2885 VERIFY(nvlist_lookup_nvlist_array(sav->sav_config, config,
2886 &olddevs, &oldndevs) == 0);
2887
2888 newdevs = kmem_alloc(sizeof (void *) *
2889 (ndevs + oldndevs), KM_SLEEP);
2890 for (i = 0; i < oldndevs; i++)
2891 VERIFY(nvlist_dup(olddevs[i], &newdevs[i],
2892 KM_SLEEP) == 0);
2893 for (i = 0; i < ndevs; i++)
2894 VERIFY(nvlist_dup(devs[i], &newdevs[i + oldndevs],
2895 KM_SLEEP) == 0);
2896
2897 VERIFY(nvlist_remove(sav->sav_config, config,
2898 DATA_TYPE_NVLIST_ARRAY) == 0);
2899
2900 VERIFY(nvlist_add_nvlist_array(sav->sav_config,
2901 config, newdevs, ndevs + oldndevs) == 0);
2902 for (i = 0; i < oldndevs + ndevs; i++)
2903 nvlist_free(newdevs[i]);
2904 kmem_free(newdevs, (oldndevs + ndevs) * sizeof (void *));
2905 } else {
2906 /*
2907 * Generate a new dev list.
2908 */
2909 VERIFY(nvlist_alloc(&sav->sav_config, NV_UNIQUE_NAME,
2910 KM_SLEEP) == 0);
2911 VERIFY(nvlist_add_nvlist_array(sav->sav_config, config,
2912 devs, ndevs) == 0);
2913 }
2914}
2915
2916/*
2917 * Stop and drop level 2 ARC devices
2918 */
2919void
2920spa_l2cache_drop(spa_t *spa)
2921{
2922 vdev_t *vd;
2923 int i;
2924 spa_aux_vdev_t *sav = &spa->spa_l2cache;
2925
2926 for (i = 0; i < sav->sav_count; i++) {
2927 uint64_t pool;
2928
2929 vd = sav->sav_vdevs[i];
2930 ASSERT(vd != NULL);
2931
2932 if (spa_l2cache_exists(vd->vdev_guid, &pool) &&
2933 pool != 0ULL && l2arc_vdev_present(vd))
2934 l2arc_remove_vdev(vd);
2930 if (vd->vdev_isl2cache)
2931 spa_l2cache_remove(vd);
2932 vdev_clear_stats(vd);
2933 (void) vdev_close(vd);
2935 }
2936}
2937
2938/*
2939 * Pool Creation
2940 */
2941int
2942spa_create(const char *pool, nvlist_t *nvroot, nvlist_t *props,
2943 const char *history_str, nvlist_t *zplprops)
2944{
2945 spa_t *spa;
2946 char *altroot = NULL;
2947 vdev_t *rvd;
2948 dsl_pool_t *dp;
2949 dmu_tx_t *tx;
2950 int error = 0;
2951 uint64_t txg = TXG_INITIAL;
2952 nvlist_t **spares, **l2cache;
2953 uint_t nspares, nl2cache;
2954 uint64_t version, obj;
2955
2956 /*
2957 * If this pool already exists, return failure.
2958 */
2959 mutex_enter(&spa_namespace_lock);
2960 if (spa_lookup(pool) != NULL) {
2961 mutex_exit(&spa_namespace_lock);
2962 return (EEXIST);
2963 }
2964
2965 /*
2966 * Allocate a new spa_t structure.
2967 */
2968 (void) nvlist_lookup_string(props,
2969 zpool_prop_to_name(ZPOOL_PROP_ALTROOT), &altroot);
2970 spa = spa_add(pool, NULL, altroot);
2971 spa_activate(spa, spa_mode_global);
2972
2973 if (props && (error = spa_prop_validate(spa, props))) {
2974 spa_deactivate(spa);
2975 spa_remove(spa);
2976 mutex_exit(&spa_namespace_lock);
2977 return (error);
2978 }
2979
2980 if (nvlist_lookup_uint64(props, zpool_prop_to_name(ZPOOL_PROP_VERSION),
2981 &version) != 0)
2982 version = SPA_VERSION;
2983 ASSERT(version <= SPA_VERSION);
2984
2985 spa->spa_first_txg = txg;
2986 spa->spa_uberblock.ub_txg = txg - 1;
2987 spa->spa_uberblock.ub_version = version;
2988 spa->spa_ubsync = spa->spa_uberblock;
2989
2990 /*
2991 * Create "The Godfather" zio to hold all async IOs
2992 */
2993 spa->spa_async_zio_root = zio_root(spa, NULL, NULL,
2994 ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE | ZIO_FLAG_GODFATHER);
2995
2996 /*
2997 * Create the root vdev.
2998 */
2999 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
3000
3001 error = spa_config_parse(spa, &rvd, nvroot, NULL, 0, VDEV_ALLOC_ADD);
3002
3003 ASSERT(error != 0 || rvd != NULL);
3004 ASSERT(error != 0 || spa->spa_root_vdev == rvd);
3005
3006 if (error == 0 && !zfs_allocatable_devs(nvroot))
3007 error = EINVAL;
3008
3009 if (error == 0 &&
3010 (error = vdev_create(rvd, txg, B_FALSE)) == 0 &&
3011 (error = spa_validate_aux(spa, nvroot, txg,
3012 VDEV_ALLOC_ADD)) == 0) {
3013 for (int c = 0; c < rvd->vdev_children; c++) {
3014 vdev_metaslab_set_size(rvd->vdev_child[c]);
3015 vdev_expand(rvd->vdev_child[c], txg);
3016 }
3017 }
3018
3019 spa_config_exit(spa, SCL_ALL, FTAG);
3020
3021 if (error != 0) {
3022 spa_unload(spa);
3023 spa_deactivate(spa);
3024 spa_remove(spa);
3025 mutex_exit(&spa_namespace_lock);
3026 return (error);
3027 }
3028
3029 /*
3030 * Get the list of spares, if specified.
3031 */
3032 if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_SPARES,
3033 &spares, &nspares) == 0) {
3034 VERIFY(nvlist_alloc(&spa->spa_spares.sav_config, NV_UNIQUE_NAME,
3035 KM_SLEEP) == 0);
3036 VERIFY(nvlist_add_nvlist_array(spa->spa_spares.sav_config,
3037 ZPOOL_CONFIG_SPARES, spares, nspares) == 0);
3038 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
3039 spa_load_spares(spa);
3040 spa_config_exit(spa, SCL_ALL, FTAG);
3041 spa->spa_spares.sav_sync = B_TRUE;
3042 }
3043
3044 /*
3045 * Get the list of level 2 cache devices, if specified.
3046 */
3047 if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_L2CACHE,
3048 &l2cache, &nl2cache) == 0) {
3049 VERIFY(nvlist_alloc(&spa->spa_l2cache.sav_config,
3050 NV_UNIQUE_NAME, KM_SLEEP) == 0);
3051 VERIFY(nvlist_add_nvlist_array(spa->spa_l2cache.sav_config,
3052 ZPOOL_CONFIG_L2CACHE, l2cache, nl2cache) == 0);
3053 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
3054 spa_load_l2cache(spa);
3055 spa_config_exit(spa, SCL_ALL, FTAG);
3056 spa->spa_l2cache.sav_sync = B_TRUE;
3057 }
3058
3059 spa->spa_dsl_pool = dp = dsl_pool_create(spa, zplprops, txg);
3060 spa->spa_meta_objset = dp->dp_meta_objset;
3061
3062 /*
3063 * Create DDTs (dedup tables).
3064 */
3065 ddt_create(spa);
3066
3067 spa_update_dspace(spa);
3068
3069 tx = dmu_tx_create_assigned(dp, txg);
3070
3071 /*
3072 * Create the pool config object.
3073 */
3074 spa->spa_config_object = dmu_object_alloc(spa->spa_meta_objset,
3075 DMU_OT_PACKED_NVLIST, SPA_CONFIG_BLOCKSIZE,
3076 DMU_OT_PACKED_NVLIST_SIZE, sizeof (uint64_t), tx);
3077
3078 if (zap_add(spa->spa_meta_objset,
3079 DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_CONFIG,
3080 sizeof (uint64_t), 1, &spa->spa_config_object, tx) != 0) {
3081 cmn_err(CE_PANIC, "failed to add pool config");
3082 }
3083
3084 if (zap_add(spa->spa_meta_objset,
3085 DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_CREATION_VERSION,
3086 sizeof (uint64_t), 1, &version, tx) != 0) {
3087 cmn_err(CE_PANIC, "failed to add pool version");
3088 }
3089
3090 /* Newly created pools with the right version are always deflated. */
3091 if (version >= SPA_VERSION_RAIDZ_DEFLATE) {
3092 spa->spa_deflate = TRUE;
3093 if (zap_add(spa->spa_meta_objset,
3094 DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_DEFLATE,
3095 sizeof (uint64_t), 1, &spa->spa_deflate, tx) != 0) {
3096 cmn_err(CE_PANIC, "failed to add deflate");
3097 }
3098 }
3099
3100 /*
3101 * Create the deferred-free bpobj. Turn off compression
3102 * because sync-to-convergence takes longer if the blocksize
3103 * keeps changing.
3104 */
3105 obj = bpobj_alloc(spa->spa_meta_objset, 1 << 14, tx);
3106 dmu_object_set_compress(spa->spa_meta_objset, obj,
3107 ZIO_COMPRESS_OFF, tx);
3108 if (zap_add(spa->spa_meta_objset,
3109 DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_SYNC_BPOBJ,
3110 sizeof (uint64_t), 1, &obj, tx) != 0) {
3111 cmn_err(CE_PANIC, "failed to add bpobj");
3112 }
3113 VERIFY3U(0, ==, bpobj_open(&spa->spa_deferred_bpobj,
3114 spa->spa_meta_objset, obj));
3115
3116 /*
3117 * Create the pool's history object.
3118 */
3119 if (version >= SPA_VERSION_ZPOOL_HISTORY)
3120 spa_history_create_obj(spa, tx);
3121
3122 /*
3123 * Set pool properties.
3124 */
3125 spa->spa_bootfs = zpool_prop_default_numeric(ZPOOL_PROP_BOOTFS);
3126 spa->spa_delegation = zpool_prop_default_numeric(ZPOOL_PROP_DELEGATION);
3127 spa->spa_failmode = zpool_prop_default_numeric(ZPOOL_PROP_FAILUREMODE);
3128 spa->spa_autoexpand = zpool_prop_default_numeric(ZPOOL_PROP_AUTOEXPAND);
3129
3130 if (props != NULL) {
3131 spa_configfile_set(spa, props, B_FALSE);
3132 spa_sync_props(spa, props, tx);
3133 }
3134
3135 dmu_tx_commit(tx);
3136
3137 spa->spa_sync_on = B_TRUE;
3138 txg_sync_start(spa->spa_dsl_pool);
3139
3140 /*
3141 * We explicitly wait for the first transaction to complete so that our
3142 * bean counters are appropriately updated.
3143 */
3144 txg_wait_synced(spa->spa_dsl_pool, txg);
3145
3146 spa_config_sync(spa, B_FALSE, B_TRUE);
3147
3148 if (version >= SPA_VERSION_ZPOOL_HISTORY && history_str != NULL)
3149 (void) spa_history_log(spa, history_str, LOG_CMD_POOL_CREATE);
3150 spa_history_log_version(spa, LOG_POOL_CREATE);
3151
3152 spa->spa_minref = refcount_count(&spa->spa_refcount);
3153
3154 mutex_exit(&spa_namespace_lock);
3155
3156 return (0);
3157}
3158
3159#if defined(sun)
3160#ifdef _KERNEL
3161/*
3162 * Get the root pool information from the root disk, then import the root pool
3163 * during the system boot up time.
3164 */
3165extern int vdev_disk_read_rootlabel(char *, char *, nvlist_t **);
3166
3167static nvlist_t *
3168spa_generate_rootconf(char *devpath, char *devid, uint64_t *guid)
3169{
3170 nvlist_t *config;
3171 nvlist_t *nvtop, *nvroot;
3172 uint64_t pgid;
3173
3174 if (vdev_disk_read_rootlabel(devpath, devid, &config) != 0)
3175 return (NULL);
3176
3177 /*
3178 * Add this top-level vdev to the child array.
3179 */
3180 VERIFY(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE,
3181 &nvtop) == 0);
3182 VERIFY(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID,
3183 &pgid) == 0);
3184 VERIFY(nvlist_lookup_uint64(config, ZPOOL_CONFIG_GUID, guid) == 0);
3185
3186 /*
3187 * Put this pool's top-level vdevs into a root vdev.
3188 */
3189 VERIFY(nvlist_alloc(&nvroot, NV_UNIQUE_NAME, KM_SLEEP) == 0);
3190 VERIFY(nvlist_add_string(nvroot, ZPOOL_CONFIG_TYPE,
3191 VDEV_TYPE_ROOT) == 0);
3192 VERIFY(nvlist_add_uint64(nvroot, ZPOOL_CONFIG_ID, 0ULL) == 0);
3193 VERIFY(nvlist_add_uint64(nvroot, ZPOOL_CONFIG_GUID, pgid) == 0);
3194 VERIFY(nvlist_add_nvlist_array(nvroot, ZPOOL_CONFIG_CHILDREN,
3195 &nvtop, 1) == 0);
3196
3197 /*
3198 * Replace the existing vdev_tree with the new root vdev in
3199 * this pool's configuration (remove the old, add the new).
3200 */
3201 VERIFY(nvlist_add_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, nvroot) == 0);
3202 nvlist_free(nvroot);
3203 return (config);
3204}
3205
3206/*
3207 * Walk the vdev tree and see if we can find a device with "better"
3208 * configuration. A configuration is "better" if the label on that
3209 * device has a more recent txg.
3210 */
3211static void
3212spa_alt_rootvdev(vdev_t *vd, vdev_t **avd, uint64_t *txg)
3213{
3214 for (int c = 0; c < vd->vdev_children; c++)
3215 spa_alt_rootvdev(vd->vdev_child[c], avd, txg);
3216
3217 if (vd->vdev_ops->vdev_op_leaf) {
3218 nvlist_t *label;
3219 uint64_t label_txg;
3220
3221 if (vdev_disk_read_rootlabel(vd->vdev_physpath, vd->vdev_devid,
3222 &label) != 0)
3223 return;
3224
3225 VERIFY(nvlist_lookup_uint64(label, ZPOOL_CONFIG_POOL_TXG,
3226 &label_txg) == 0);
3227
3228 /*
3229 * Do we have a better boot device?
3230 */
3231 if (label_txg > *txg) {
3232 *txg = label_txg;
3233 *avd = vd;
3234 }
3235 nvlist_free(label);
3236 }
3237}
3238
3239/*
3240 * Import a root pool.
3241 *
3242 * For x86. devpath_list will consist of devid and/or physpath name of
3243 * the vdev (e.g. "id1,sd@SSEAGATE..." or "/pci@1f,0/ide@d/disk@0,0:a").
3244 * The GRUB "findroot" command will return the vdev we should boot.
3245 *
3246 * For Sparc, devpath_list consists the physpath name of the booting device
3247 * no matter the rootpool is a single device pool or a mirrored pool.
3248 * e.g.
3249 * "/pci@1f,0/ide@d/disk@0,0:a"
3250 */
3251int
3252spa_import_rootpool(char *devpath, char *devid)
3253{
3254 spa_t *spa;
3255 vdev_t *rvd, *bvd, *avd = NULL;
3256 nvlist_t *config, *nvtop;
3257 uint64_t guid, txg;
3258 char *pname;
3259 int error;
3260
3261 /*
3262 * Read the label from the boot device and generate a configuration.
3263 */
3264 config = spa_generate_rootconf(devpath, devid, &guid);
3265#if defined(_OBP) && defined(_KERNEL)
3266 if (config == NULL) {
3267 if (strstr(devpath, "/iscsi/ssd") != NULL) {
3268 /* iscsi boot */
3269 get_iscsi_bootpath_phy(devpath);
3270 config = spa_generate_rootconf(devpath, devid, &guid);
3271 }
3272 }
3273#endif
3274 if (config == NULL) {
3275 cmn_err(CE_NOTE, "Can not read the pool label from '%s'",
3276 devpath);
3277 return (EIO);
3278 }
3279
3280 VERIFY(nvlist_lookup_string(config, ZPOOL_CONFIG_POOL_NAME,
3281 &pname) == 0);
3282 VERIFY(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_TXG, &txg) == 0);
3283
3284 mutex_enter(&spa_namespace_lock);
3285 if ((spa = spa_lookup(pname)) != NULL) {
3286 /*
3287 * Remove the existing root pool from the namespace so that we
3288 * can replace it with the correct config we just read in.
3289 */
3290 spa_remove(spa);
3291 }
3292
3293 spa = spa_add(pname, config, NULL);
3294 spa->spa_is_root = B_TRUE;
3295 spa->spa_import_flags = ZFS_IMPORT_VERBATIM;
3296
3297 /*
3298 * Build up a vdev tree based on the boot device's label config.
3299 */
3300 VERIFY(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE,
3301 &nvtop) == 0);
3302 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
3303 error = spa_config_parse(spa, &rvd, nvtop, NULL, 0,
3304 VDEV_ALLOC_ROOTPOOL);
3305 spa_config_exit(spa, SCL_ALL, FTAG);
3306 if (error) {
3307 mutex_exit(&spa_namespace_lock);
3308 nvlist_free(config);
3309 cmn_err(CE_NOTE, "Can not parse the config for pool '%s'",
3310 pname);
3311 return (error);
3312 }
3313
3314 /*
3315 * Get the boot vdev.
3316 */
3317 if ((bvd = vdev_lookup_by_guid(rvd, guid)) == NULL) {
3318 cmn_err(CE_NOTE, "Can not find the boot vdev for guid %llu",
3319 (u_longlong_t)guid);
3320 error = ENOENT;
3321 goto out;
3322 }
3323
3324 /*
3325 * Determine if there is a better boot device.
3326 */
3327 avd = bvd;
3328 spa_alt_rootvdev(rvd, &avd, &txg);
3329 if (avd != bvd) {
3330 cmn_err(CE_NOTE, "The boot device is 'degraded'. Please "
3331 "try booting from '%s'", avd->vdev_path);
3332 error = EINVAL;
3333 goto out;
3334 }
3335
3336 /*
3337 * If the boot device is part of a spare vdev then ensure that
3338 * we're booting off the active spare.
3339 */
3340 if (bvd->vdev_parent->vdev_ops == &vdev_spare_ops &&
3341 !bvd->vdev_isspare) {
3342 cmn_err(CE_NOTE, "The boot device is currently spared. Please "
3343 "try booting from '%s'",
3344 bvd->vdev_parent->
3345 vdev_child[bvd->vdev_parent->vdev_children - 1]->vdev_path);
3346 error = EINVAL;
3347 goto out;
3348 }
3349
3350 error = 0;
3351 spa_history_log_version(spa, LOG_POOL_IMPORT);
3352out:
3353 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
3354 vdev_free(rvd);
3355 spa_config_exit(spa, SCL_ALL, FTAG);
3356 mutex_exit(&spa_namespace_lock);
3357
3358 nvlist_free(config);
3359 return (error);
3360}
3361
3362#endif
3363#endif /* sun */
3364
3365/*
3366 * Import a non-root pool into the system.
3367 */
3368int
3369spa_import(const char *pool, nvlist_t *config, nvlist_t *props, uint64_t flags)
3370{
3371 spa_t *spa;
3372 char *altroot = NULL;
3373 spa_load_state_t state = SPA_LOAD_IMPORT;
3374 zpool_rewind_policy_t policy;
3375 uint64_t mode = spa_mode_global;
3376 uint64_t readonly = B_FALSE;
3377 int error;
3378 nvlist_t *nvroot;
3379 nvlist_t **spares, **l2cache;
3380 uint_t nspares, nl2cache;
3381
3382 /*
3383 * If a pool with this name exists, return failure.
3384 */
3385 mutex_enter(&spa_namespace_lock);
3386 if (spa_lookup(pool) != NULL) {
3387 mutex_exit(&spa_namespace_lock);
3388 return (EEXIST);
3389 }
3390
3391 /*
3392 * Create and initialize the spa structure.
3393 */
3394 (void) nvlist_lookup_string(props,
3395 zpool_prop_to_name(ZPOOL_PROP_ALTROOT), &altroot);
3396 (void) nvlist_lookup_uint64(props,
3397 zpool_prop_to_name(ZPOOL_PROP_READONLY), &readonly);
3398 if (readonly)
3399 mode = FREAD;
3400 spa = spa_add(pool, config, altroot);
3401 spa->spa_import_flags = flags;
3402
3403 /*
3404 * Verbatim import - Take a pool and insert it into the namespace
3405 * as if it had been loaded at boot.
3406 */
3407 if (spa->spa_import_flags & ZFS_IMPORT_VERBATIM) {
3408 if (props != NULL)
3409 spa_configfile_set(spa, props, B_FALSE);
3410
3411 spa_config_sync(spa, B_FALSE, B_TRUE);
3412
3413 mutex_exit(&spa_namespace_lock);
3414 spa_history_log_version(spa, LOG_POOL_IMPORT);
3415
3416 return (0);
3417 }
3418
3419 spa_activate(spa, mode);
3420
3421 /*
3422 * Don't start async tasks until we know everything is healthy.
3423 */
3424 spa_async_suspend(spa);
3425
3426 zpool_get_rewind_policy(config, &policy);
3427 if (policy.zrp_request & ZPOOL_DO_REWIND)
3428 state = SPA_LOAD_RECOVER;
3429
3430 /*
3431 * Pass off the heavy lifting to spa_load(). Pass TRUE for mosconfig
3432 * because the user-supplied config is actually the one to trust when
3433 * doing an import.
3434 */
3435 if (state != SPA_LOAD_RECOVER)
3436 spa->spa_last_ubsync_txg = spa->spa_load_txg = 0;
3437
3438 error = spa_load_best(spa, state, B_TRUE, policy.zrp_txg,
3439 policy.zrp_request);
3440
3441 /*
3442 * Propagate anything learned while loading the pool and pass it
3443 * back to caller (i.e. rewind info, missing devices, etc).
3444 */
3445 VERIFY(nvlist_add_nvlist(config, ZPOOL_CONFIG_LOAD_INFO,
3446 spa->spa_load_info) == 0);
3447
3448 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
3449 /*
3450 * Toss any existing sparelist, as it doesn't have any validity
3451 * anymore, and conflicts with spa_has_spare().
3452 */
3453 if (spa->spa_spares.sav_config) {
3454 nvlist_free(spa->spa_spares.sav_config);
3455 spa->spa_spares.sav_config = NULL;
3456 spa_load_spares(spa);
3457 }
3458 if (spa->spa_l2cache.sav_config) {
3459 nvlist_free(spa->spa_l2cache.sav_config);
3460 spa->spa_l2cache.sav_config = NULL;
3461 spa_load_l2cache(spa);
3462 }
3463
3464 VERIFY(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE,
3465 &nvroot) == 0);
3466 if (error == 0)
3467 error = spa_validate_aux(spa, nvroot, -1ULL,
3468 VDEV_ALLOC_SPARE);
3469 if (error == 0)
3470 error = spa_validate_aux(spa, nvroot, -1ULL,
3471 VDEV_ALLOC_L2CACHE);
3472 spa_config_exit(spa, SCL_ALL, FTAG);
3473
3474 if (props != NULL)
3475 spa_configfile_set(spa, props, B_FALSE);
3476
3477 if (error != 0 || (props && spa_writeable(spa) &&
3478 (error = spa_prop_set(spa, props)))) {
3479 spa_unload(spa);
3480 spa_deactivate(spa);
3481 spa_remove(spa);
3482 mutex_exit(&spa_namespace_lock);
3483 return (error);
3484 }
3485
3486 spa_async_resume(spa);
3487
3488 /*
3489 * Override any spares and level 2 cache devices as specified by
3490 * the user, as these may have correct device names/devids, etc.
3491 */
3492 if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_SPARES,
3493 &spares, &nspares) == 0) {
3494 if (spa->spa_spares.sav_config)
3495 VERIFY(nvlist_remove(spa->spa_spares.sav_config,
3496 ZPOOL_CONFIG_SPARES, DATA_TYPE_NVLIST_ARRAY) == 0);
3497 else
3498 VERIFY(nvlist_alloc(&spa->spa_spares.sav_config,
3499 NV_UNIQUE_NAME, KM_SLEEP) == 0);
3500 VERIFY(nvlist_add_nvlist_array(spa->spa_spares.sav_config,
3501 ZPOOL_CONFIG_SPARES, spares, nspares) == 0);
3502 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
3503 spa_load_spares(spa);
3504 spa_config_exit(spa, SCL_ALL, FTAG);
3505 spa->spa_spares.sav_sync = B_TRUE;
3506 }
3507 if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_L2CACHE,
3508 &l2cache, &nl2cache) == 0) {
3509 if (spa->spa_l2cache.sav_config)
3510 VERIFY(nvlist_remove(spa->spa_l2cache.sav_config,
3511 ZPOOL_CONFIG_L2CACHE, DATA_TYPE_NVLIST_ARRAY) == 0);
3512 else
3513 VERIFY(nvlist_alloc(&spa->spa_l2cache.sav_config,
3514 NV_UNIQUE_NAME, KM_SLEEP) == 0);
3515 VERIFY(nvlist_add_nvlist_array(spa->spa_l2cache.sav_config,
3516 ZPOOL_CONFIG_L2CACHE, l2cache, nl2cache) == 0);
3517 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
3518 spa_load_l2cache(spa);
3519 spa_config_exit(spa, SCL_ALL, FTAG);
3520 spa->spa_l2cache.sav_sync = B_TRUE;
3521 }
3522
3523 /*
3524 * Check for any removed devices.
3525 */
3526 if (spa->spa_autoreplace) {
3527 spa_aux_check_removed(&spa->spa_spares);
3528 spa_aux_check_removed(&spa->spa_l2cache);
3529 }
3530
3531 if (spa_writeable(spa)) {
3532 /*
3533 * Update the config cache to include the newly-imported pool.
3534 */
3535 spa_config_update(spa, SPA_CONFIG_UPDATE_POOL);
3536 }
3537
3538 /*
3539 * It's possible that the pool was expanded while it was exported.
3540 * We kick off an async task to handle this for us.
3541 */
3542 spa_async_request(spa, SPA_ASYNC_AUTOEXPAND);
3543
3544 mutex_exit(&spa_namespace_lock);
3545 spa_history_log_version(spa, LOG_POOL_IMPORT);
3546
3547#ifdef __FreeBSD__
3548#ifdef _KERNEL
3549 zvol_create_minors(pool);
3550#endif
3551#endif
3552 return (0);
3553}
3554
3555nvlist_t *
3556spa_tryimport(nvlist_t *tryconfig)
3557{
3558 nvlist_t *config = NULL;
3559 char *poolname;
3560 spa_t *spa;
3561 uint64_t state;
3562 int error;
3563
3564 if (nvlist_lookup_string(tryconfig, ZPOOL_CONFIG_POOL_NAME, &poolname))
3565 return (NULL);
3566
3567 if (nvlist_lookup_uint64(tryconfig, ZPOOL_CONFIG_POOL_STATE, &state))
3568 return (NULL);
3569
3570 /*
3571 * Create and initialize the spa structure.
3572 */
3573 mutex_enter(&spa_namespace_lock);
3574 spa = spa_add(TRYIMPORT_NAME, tryconfig, NULL);
3575 spa_activate(spa, FREAD);
3576
3577 /*
3578 * Pass off the heavy lifting to spa_load().
3579 * Pass TRUE for mosconfig because the user-supplied config
3580 * is actually the one to trust when doing an import.
3581 */
3582 error = spa_load(spa, SPA_LOAD_TRYIMPORT, SPA_IMPORT_EXISTING, B_TRUE);
3583
3584 /*
3585 * If 'tryconfig' was at least parsable, return the current config.
3586 */
3587 if (spa->spa_root_vdev != NULL) {
3588 config = spa_config_generate(spa, NULL, -1ULL, B_TRUE);
3589 VERIFY(nvlist_add_string(config, ZPOOL_CONFIG_POOL_NAME,
3590 poolname) == 0);
3591 VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_POOL_STATE,
3592 state) == 0);
3593 VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_TIMESTAMP,
3594 spa->spa_uberblock.ub_timestamp) == 0);
3595
3596 /*
3597 * If the bootfs property exists on this pool then we
3598 * copy it out so that external consumers can tell which
3599 * pools are bootable.
3600 */
3601 if ((!error || error == EEXIST) && spa->spa_bootfs) {
3602 char *tmpname = kmem_alloc(MAXPATHLEN, KM_SLEEP);
3603
3604 /*
3605 * We have to play games with the name since the
3606 * pool was opened as TRYIMPORT_NAME.
3607 */
3608 if (dsl_dsobj_to_dsname(spa_name(spa),
3609 spa->spa_bootfs, tmpname) == 0) {
3610 char *cp;
3611 char *dsname = kmem_alloc(MAXPATHLEN, KM_SLEEP);
3612
3613 cp = strchr(tmpname, '/');
3614 if (cp == NULL) {
3615 (void) strlcpy(dsname, tmpname,
3616 MAXPATHLEN);
3617 } else {
3618 (void) snprintf(dsname, MAXPATHLEN,
3619 "%s/%s", poolname, ++cp);
3620 }
3621 VERIFY(nvlist_add_string(config,
3622 ZPOOL_CONFIG_BOOTFS, dsname) == 0);
3623 kmem_free(dsname, MAXPATHLEN);
3624 }
3625 kmem_free(tmpname, MAXPATHLEN);
3626 }
3627
3628 /*
3629 * Add the list of hot spares and level 2 cache devices.
3630 */
3631 spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER);
3632 spa_add_spares(spa, config);
3633 spa_add_l2cache(spa, config);
3634 spa_config_exit(spa, SCL_CONFIG, FTAG);
3635 }
3636
3637 spa_unload(spa);
3638 spa_deactivate(spa);
3639 spa_remove(spa);
3640 mutex_exit(&spa_namespace_lock);
3641
3642 return (config);
3643}
3644
3645/*
3646 * Pool export/destroy
3647 *
3648 * The act of destroying or exporting a pool is very simple. We make sure there
3649 * is no more pending I/O and any references to the pool are gone. Then, we
3650 * update the pool state and sync all the labels to disk, removing the
3651 * configuration from the cache afterwards. If the 'hardforce' flag is set, then
3652 * we don't sync the labels or remove the configuration cache.
3653 */
3654static int
3655spa_export_common(char *pool, int new_state, nvlist_t **oldconfig,
3656 boolean_t force, boolean_t hardforce)
3657{
3658 spa_t *spa;
3659
3660 if (oldconfig)
3661 *oldconfig = NULL;
3662
3663 if (!(spa_mode_global & FWRITE))
3664 return (EROFS);
3665
3666 mutex_enter(&spa_namespace_lock);
3667 if ((spa = spa_lookup(pool)) == NULL) {
3668 mutex_exit(&spa_namespace_lock);
3669 return (ENOENT);
3670 }
3671
3672 /*
3673 * Put a hold on the pool, drop the namespace lock, stop async tasks,
3674 * reacquire the namespace lock, and see if we can export.
3675 */
3676 spa_open_ref(spa, FTAG);
3677 mutex_exit(&spa_namespace_lock);
3678 spa_async_suspend(spa);
3679 mutex_enter(&spa_namespace_lock);
3680 spa_close(spa, FTAG);
3681
3682 /*
3683 * The pool will be in core if it's openable,
3684 * in which case we can modify its state.
3685 */
3686 if (spa->spa_state != POOL_STATE_UNINITIALIZED && spa->spa_sync_on) {
3687 /*
3688 * Objsets may be open only because they're dirty, so we
3689 * have to force it to sync before checking spa_refcnt.
3690 */
3691 txg_wait_synced(spa->spa_dsl_pool, 0);
3692
3693 /*
3694 * A pool cannot be exported or destroyed if there are active
3695 * references. If we are resetting a pool, allow references by
3696 * fault injection handlers.
3697 */
3698 if (!spa_refcount_zero(spa) ||
3699 (spa->spa_inject_ref != 0 &&
3700 new_state != POOL_STATE_UNINITIALIZED)) {
3701 spa_async_resume(spa);
3702 mutex_exit(&spa_namespace_lock);
3703 return (EBUSY);
3704 }
3705
3706 /*
3707 * A pool cannot be exported if it has an active shared spare.
3708 * This is to prevent other pools stealing the active spare
3709 * from an exported pool. At user's own will, such pool can
3710 * be forcedly exported.
3711 */
3712 if (!force && new_state == POOL_STATE_EXPORTED &&
3713 spa_has_active_shared_spare(spa)) {
3714 spa_async_resume(spa);
3715 mutex_exit(&spa_namespace_lock);
3716 return (EXDEV);
3717 }
3718
3719 /*
3720 * We want this to be reflected on every label,
3721 * so mark them all dirty. spa_unload() will do the
3722 * final sync that pushes these changes out.
3723 */
3724 if (new_state != POOL_STATE_UNINITIALIZED && !hardforce) {
3725 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
3726 spa->spa_state = new_state;
3727 spa->spa_final_txg = spa_last_synced_txg(spa) +
3728 TXG_DEFER_SIZE + 1;
3729 vdev_config_dirty(spa->spa_root_vdev);
3730 spa_config_exit(spa, SCL_ALL, FTAG);
3731 }
3732 }
3733
3734 spa_event_notify(spa, NULL, ESC_ZFS_POOL_DESTROY);
3735
3736 if (spa->spa_state != POOL_STATE_UNINITIALIZED) {
3737 spa_unload(spa);
3738 spa_deactivate(spa);
3739 }
3740
3741 if (oldconfig && spa->spa_config)
3742 VERIFY(nvlist_dup(spa->spa_config, oldconfig, 0) == 0);
3743
3744 if (new_state != POOL_STATE_UNINITIALIZED) {
3745 if (!hardforce)
3746 spa_config_sync(spa, B_TRUE, B_TRUE);
3747 spa_remove(spa);
3748 }
3749 mutex_exit(&spa_namespace_lock);
3750
3751 return (0);
3752}
3753
3754/*
3755 * Destroy a storage pool.
3756 */
3757int
3758spa_destroy(char *pool)
3759{
3760 return (spa_export_common(pool, POOL_STATE_DESTROYED, NULL,
3761 B_FALSE, B_FALSE));
3762}
3763
3764/*
3765 * Export a storage pool.
3766 */
3767int
3768spa_export(char *pool, nvlist_t **oldconfig, boolean_t force,
3769 boolean_t hardforce)
3770{
3771 return (spa_export_common(pool, POOL_STATE_EXPORTED, oldconfig,
3772 force, hardforce));
3773}
3774
3775/*
3776 * Similar to spa_export(), this unloads the spa_t without actually removing it
3777 * from the namespace in any way.
3778 */
3779int
3780spa_reset(char *pool)
3781{
3782 return (spa_export_common(pool, POOL_STATE_UNINITIALIZED, NULL,
3783 B_FALSE, B_FALSE));
3784}
3785
3786/*
3787 * ==========================================================================
3788 * Device manipulation
3789 * ==========================================================================
3790 */
3791
3792/*
3793 * Add a device to a storage pool.
3794 */
3795int
3796spa_vdev_add(spa_t *spa, nvlist_t *nvroot)
3797{
3798 uint64_t txg, id;
3799 int error;
3800 vdev_t *rvd = spa->spa_root_vdev;
3801 vdev_t *vd, *tvd;
3802 nvlist_t **spares, **l2cache;
3803 uint_t nspares, nl2cache;
3804
3805 ASSERT(spa_writeable(spa));
3806
3807 txg = spa_vdev_enter(spa);
3808
3809 if ((error = spa_config_parse(spa, &vd, nvroot, NULL, 0,
3810 VDEV_ALLOC_ADD)) != 0)
3811 return (spa_vdev_exit(spa, NULL, txg, error));
3812
3813 spa->spa_pending_vdev = vd; /* spa_vdev_exit() will clear this */
3814
3815 if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_SPARES, &spares,
3816 &nspares) != 0)
3817 nspares = 0;
3818
3819 if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_L2CACHE, &l2cache,
3820 &nl2cache) != 0)
3821 nl2cache = 0;
3822
3823 if (vd->vdev_children == 0 && nspares == 0 && nl2cache == 0)
3824 return (spa_vdev_exit(spa, vd, txg, EINVAL));
3825
3826 if (vd->vdev_children != 0 &&
3827 (error = vdev_create(vd, txg, B_FALSE)) != 0)
3828 return (spa_vdev_exit(spa, vd, txg, error));
3829
3830 /*
3831 * We must validate the spares and l2cache devices after checking the
3832 * children. Otherwise, vdev_inuse() will blindly overwrite the spare.
3833 */
3834 if ((error = spa_validate_aux(spa, nvroot, txg, VDEV_ALLOC_ADD)) != 0)
3835 return (spa_vdev_exit(spa, vd, txg, error));
3836
3837 /*
3838 * Transfer each new top-level vdev from vd to rvd.
3839 */
3840 for (int c = 0; c < vd->vdev_children; c++) {
3841
3842 /*
3843 * Set the vdev id to the first hole, if one exists.
3844 */
3845 for (id = 0; id < rvd->vdev_children; id++) {
3846 if (rvd->vdev_child[id]->vdev_ishole) {
3847 vdev_free(rvd->vdev_child[id]);
3848 break;
3849 }
3850 }
3851 tvd = vd->vdev_child[c];
3852 vdev_remove_child(vd, tvd);
3853 tvd->vdev_id = id;
3854 vdev_add_child(rvd, tvd);
3855 vdev_config_dirty(tvd);
3856 }
3857
3858 if (nspares != 0) {
3859 spa_set_aux_vdevs(&spa->spa_spares, spares, nspares,
3860 ZPOOL_CONFIG_SPARES);
3861 spa_load_spares(spa);
3862 spa->spa_spares.sav_sync = B_TRUE;
3863 }
3864
3865 if (nl2cache != 0) {
3866 spa_set_aux_vdevs(&spa->spa_l2cache, l2cache, nl2cache,
3867 ZPOOL_CONFIG_L2CACHE);
3868 spa_load_l2cache(spa);
3869 spa->spa_l2cache.sav_sync = B_TRUE;
3870 }
3871
3872 /*
3873 * We have to be careful when adding new vdevs to an existing pool.
3874 * If other threads start allocating from these vdevs before we
3875 * sync the config cache, and we lose power, then upon reboot we may
3876 * fail to open the pool because there are DVAs that the config cache
3877 * can't translate. Therefore, we first add the vdevs without
3878 * initializing metaslabs; sync the config cache (via spa_vdev_exit());
3879 * and then let spa_config_update() initialize the new metaslabs.
3880 *
3881 * spa_load() checks for added-but-not-initialized vdevs, so that
3882 * if we lose power at any point in this sequence, the remaining
3883 * steps will be completed the next time we load the pool.
3884 */
3885 (void) spa_vdev_exit(spa, vd, txg, 0);
3886
3887 mutex_enter(&spa_namespace_lock);
3888 spa_config_update(spa, SPA_CONFIG_UPDATE_POOL);
3889 mutex_exit(&spa_namespace_lock);
3890
3891 return (0);
3892}
3893
3894/*
3895 * Attach a device to a mirror. The arguments are the path to any device
3896 * in the mirror, and the nvroot for the new device. If the path specifies
3897 * a device that is not mirrored, we automatically insert the mirror vdev.
3898 *
3899 * If 'replacing' is specified, the new device is intended to replace the
3900 * existing device; in this case the two devices are made into their own
3901 * mirror using the 'replacing' vdev, which is functionally identical to
3902 * the mirror vdev (it actually reuses all the same ops) but has a few
3903 * extra rules: you can't attach to it after it's been created, and upon
3904 * completion of resilvering, the first disk (the one being replaced)
3905 * is automatically detached.
3906 */
3907int
3908spa_vdev_attach(spa_t *spa, uint64_t guid, nvlist_t *nvroot, int replacing)
3909{
3910 uint64_t txg, dtl_max_txg;
3911 vdev_t *rvd = spa->spa_root_vdev;
3912 vdev_t *oldvd, *newvd, *newrootvd, *pvd, *tvd;
3913 vdev_ops_t *pvops;
3914 char *oldvdpath, *newvdpath;
3915 int newvd_isspare;
3916 int error;
3917
3918 ASSERT(spa_writeable(spa));
3919
3920 txg = spa_vdev_enter(spa);
3921
3922 oldvd = spa_lookup_by_guid(spa, guid, B_FALSE);
3923
3924 if (oldvd == NULL)
3925 return (spa_vdev_exit(spa, NULL, txg, ENODEV));
3926
3927 if (!oldvd->vdev_ops->vdev_op_leaf)
3928 return (spa_vdev_exit(spa, NULL, txg, ENOTSUP));
3929
3930 pvd = oldvd->vdev_parent;
3931
3932 if ((error = spa_config_parse(spa, &newrootvd, nvroot, NULL, 0,
3932 VDEV_ALLOC_ADD)) != 0)
3933 VDEV_ALLOC_ATTACH)) != 0)
3934 return (spa_vdev_exit(spa, NULL, txg, EINVAL));
3935
3936 if (newrootvd->vdev_children != 1)
3937 return (spa_vdev_exit(spa, newrootvd, txg, EINVAL));
3938
3939 newvd = newrootvd->vdev_child[0];
3940
3941 if (!newvd->vdev_ops->vdev_op_leaf)
3942 return (spa_vdev_exit(spa, newrootvd, txg, EINVAL));
3943
3944 if ((error = vdev_create(newrootvd, txg, replacing)) != 0)
3945 return (spa_vdev_exit(spa, newrootvd, txg, error));
3946
3947 /*
3948 * Spares can't replace logs
3949 */
3950 if (oldvd->vdev_top->vdev_islog && newvd->vdev_isspare)
3951 return (spa_vdev_exit(spa, newrootvd, txg, ENOTSUP));
3952
3953 if (!replacing) {
3954 /*
3955 * For attach, the only allowable parent is a mirror or the root
3956 * vdev.
3957 */
3958 if (pvd->vdev_ops != &vdev_mirror_ops &&
3959 pvd->vdev_ops != &vdev_root_ops)
3960 return (spa_vdev_exit(spa, newrootvd, txg, ENOTSUP));
3961
3962 pvops = &vdev_mirror_ops;
3963 } else {
3964 /*
3965 * Active hot spares can only be replaced by inactive hot
3966 * spares.
3967 */
3968 if (pvd->vdev_ops == &vdev_spare_ops &&
3969 oldvd->vdev_isspare &&
3970 !spa_has_spare(spa, newvd->vdev_guid))
3971 return (spa_vdev_exit(spa, newrootvd, txg, ENOTSUP));
3972
3973 /*
3974 * If the source is a hot spare, and the parent isn't already a
3975 * spare, then we want to create a new hot spare. Otherwise, we
3976 * want to create a replacing vdev. The user is not allowed to
3977 * attach to a spared vdev child unless the 'isspare' state is
3978 * the same (spare replaces spare, non-spare replaces
3979 * non-spare).
3980 */
3981 if (pvd->vdev_ops == &vdev_replacing_ops &&
3982 spa_version(spa) < SPA_VERSION_MULTI_REPLACE) {
3983 return (spa_vdev_exit(spa, newrootvd, txg, ENOTSUP));
3984 } else if (pvd->vdev_ops == &vdev_spare_ops &&
3985 newvd->vdev_isspare != oldvd->vdev_isspare) {
3986 return (spa_vdev_exit(spa, newrootvd, txg, ENOTSUP));
3987 }
3988
3989 if (newvd->vdev_isspare)
3990 pvops = &vdev_spare_ops;
3991 else
3992 pvops = &vdev_replacing_ops;
3993 }
3994
3995 /*
3996 * Make sure the new device is big enough.
3997 */
3998 if (newvd->vdev_asize < vdev_get_min_asize(oldvd))
3999 return (spa_vdev_exit(spa, newrootvd, txg, EOVERFLOW));
4000
4001 /*
4002 * The new device cannot have a higher alignment requirement
4003 * than the top-level vdev.
4004 */
4005 if (newvd->vdev_ashift > oldvd->vdev_top->vdev_ashift)
4006 return (spa_vdev_exit(spa, newrootvd, txg, EDOM));
4007
4008 /*
4009 * If this is an in-place replacement, update oldvd's path and devid
4010 * to make it distinguishable from newvd, and unopenable from now on.
4011 */
4012 if (strcmp(oldvd->vdev_path, newvd->vdev_path) == 0) {
4013 spa_strfree(oldvd->vdev_path);
4014 oldvd->vdev_path = kmem_alloc(strlen(newvd->vdev_path) + 5,
4015 KM_SLEEP);
4016 (void) sprintf(oldvd->vdev_path, "%s/%s",
4017 newvd->vdev_path, "old");
4018 if (oldvd->vdev_devid != NULL) {
4019 spa_strfree(oldvd->vdev_devid);
4020 oldvd->vdev_devid = NULL;
4021 }
4022 }
4023
4024 /* mark the device being resilvered */
4025 newvd->vdev_resilvering = B_TRUE;
4026
4027 /*
4028 * If the parent is not a mirror, or if we're replacing, insert the new
4029 * mirror/replacing/spare vdev above oldvd.
4030 */
4031 if (pvd->vdev_ops != pvops)
4032 pvd = vdev_add_parent(oldvd, pvops);
4033
4034 ASSERT(pvd->vdev_top->vdev_parent == rvd);
4035 ASSERT(pvd->vdev_ops == pvops);
4036 ASSERT(oldvd->vdev_parent == pvd);
4037
4038 /*
4039 * Extract the new device from its root and add it to pvd.
4040 */
4041 vdev_remove_child(newrootvd, newvd);
4042 newvd->vdev_id = pvd->vdev_children;
4043 newvd->vdev_crtxg = oldvd->vdev_crtxg;
4044 vdev_add_child(pvd, newvd);
4045
4046 tvd = newvd->vdev_top;
4047 ASSERT(pvd->vdev_top == tvd);
4048 ASSERT(tvd->vdev_parent == rvd);
4049
4050 vdev_config_dirty(tvd);
4051
4052 /*
4053 * Set newvd's DTL to [TXG_INITIAL, dtl_max_txg) so that we account
4054 * for any dmu_sync-ed blocks. It will propagate upward when
4055 * spa_vdev_exit() calls vdev_dtl_reassess().
4056 */
4057 dtl_max_txg = txg + TXG_CONCURRENT_STATES;
4058
4059 vdev_dtl_dirty(newvd, DTL_MISSING, TXG_INITIAL,
4060 dtl_max_txg - TXG_INITIAL);
4061
4062 if (newvd->vdev_isspare) {
4063 spa_spare_activate(newvd);
4064 spa_event_notify(spa, newvd, ESC_ZFS_VDEV_SPARE);
4065 }
4066
4067 oldvdpath = spa_strdup(oldvd->vdev_path);
4068 newvdpath = spa_strdup(newvd->vdev_path);
4069 newvd_isspare = newvd->vdev_isspare;
4070
4071 /*
4072 * Mark newvd's DTL dirty in this txg.
4073 */
4074 vdev_dirty(tvd, VDD_DTL, newvd, txg);
4075
4076 /*
4077 * Restart the resilver
4078 */
4079 dsl_resilver_restart(spa->spa_dsl_pool, dtl_max_txg);
4080
4081 /*
4082 * Commit the config
4083 */
4084 (void) spa_vdev_exit(spa, newrootvd, dtl_max_txg, 0);
4085
4086 spa_history_log_internal(LOG_POOL_VDEV_ATTACH, spa, NULL,
4087 "%s vdev=%s %s vdev=%s",
4088 replacing && newvd_isspare ? "spare in" :
4089 replacing ? "replace" : "attach", newvdpath,
4090 replacing ? "for" : "to", oldvdpath);
4091
4092 spa_strfree(oldvdpath);
4093 spa_strfree(newvdpath);
4094
4095 if (spa->spa_bootfs)
4096 spa_event_notify(spa, newvd, ESC_ZFS_BOOTFS_VDEV_ATTACH);
4097
4098 return (0);
4099}
4100
4101/*
4102 * Detach a device from a mirror or replacing vdev.
4103 * If 'replace_done' is specified, only detach if the parent
4104 * is a replacing vdev.
4105 */
4106int
4107spa_vdev_detach(spa_t *spa, uint64_t guid, uint64_t pguid, int replace_done)
4108{
4109 uint64_t txg;
4110 int error;
4111 vdev_t *rvd = spa->spa_root_vdev;
4112 vdev_t *vd, *pvd, *cvd, *tvd;
4113 boolean_t unspare = B_FALSE;
4114 uint64_t unspare_guid;
4115 char *vdpath;
4116
4117 ASSERT(spa_writeable(spa));
4118
4119 txg = spa_vdev_enter(spa);
4120
4121 vd = spa_lookup_by_guid(spa, guid, B_FALSE);
4122
4123 if (vd == NULL)
4124 return (spa_vdev_exit(spa, NULL, txg, ENODEV));
4125
4126 if (!vd->vdev_ops->vdev_op_leaf)
4127 return (spa_vdev_exit(spa, NULL, txg, ENOTSUP));
4128
4129 pvd = vd->vdev_parent;
4130
4131 /*
4132 * If the parent/child relationship is not as expected, don't do it.
4133 * Consider M(A,R(B,C)) -- that is, a mirror of A with a replacing
4134 * vdev that's replacing B with C. The user's intent in replacing
4135 * is to go from M(A,B) to M(A,C). If the user decides to cancel
4136 * the replace by detaching C, the expected behavior is to end up
4137 * M(A,B). But suppose that right after deciding to detach C,
4138 * the replacement of B completes. We would have M(A,C), and then
4139 * ask to detach C, which would leave us with just A -- not what
4140 * the user wanted. To prevent this, we make sure that the
4141 * parent/child relationship hasn't changed -- in this example,
4142 * that C's parent is still the replacing vdev R.
4143 */
4144 if (pvd->vdev_guid != pguid && pguid != 0)
4145 return (spa_vdev_exit(spa, NULL, txg, EBUSY));
4146
4147 /*
4148 * Only 'replacing' or 'spare' vdevs can be replaced.
4149 */
4150 if (replace_done && pvd->vdev_ops != &vdev_replacing_ops &&
4151 pvd->vdev_ops != &vdev_spare_ops)
4152 return (spa_vdev_exit(spa, NULL, txg, ENOTSUP));
4153
4154 ASSERT(pvd->vdev_ops != &vdev_spare_ops ||
4155 spa_version(spa) >= SPA_VERSION_SPARES);
4156
4157 /*
4158 * Only mirror, replacing, and spare vdevs support detach.
4159 */
4160 if (pvd->vdev_ops != &vdev_replacing_ops &&
4161 pvd->vdev_ops != &vdev_mirror_ops &&
4162 pvd->vdev_ops != &vdev_spare_ops)
4163 return (spa_vdev_exit(spa, NULL, txg, ENOTSUP));
4164
4165 /*
4166 * If this device has the only valid copy of some data,
4167 * we cannot safely detach it.
4168 */
4169 if (vdev_dtl_required(vd))
4170 return (spa_vdev_exit(spa, NULL, txg, EBUSY));
4171
4172 ASSERT(pvd->vdev_children >= 2);
4173
4174 /*
4175 * If we are detaching the second disk from a replacing vdev, then
4176 * check to see if we changed the original vdev's path to have "/old"
4177 * at the end in spa_vdev_attach(). If so, undo that change now.
4178 */
4179 if (pvd->vdev_ops == &vdev_replacing_ops && vd->vdev_id > 0 &&
4180 vd->vdev_path != NULL) {
4181 size_t len = strlen(vd->vdev_path);
4182
4183 for (int c = 0; c < pvd->vdev_children; c++) {
4184 cvd = pvd->vdev_child[c];
4185
4186 if (cvd == vd || cvd->vdev_path == NULL)
4187 continue;
4188
4189 if (strncmp(cvd->vdev_path, vd->vdev_path, len) == 0 &&
4190 strcmp(cvd->vdev_path + len, "/old") == 0) {
4191 spa_strfree(cvd->vdev_path);
4192 cvd->vdev_path = spa_strdup(vd->vdev_path);
4193 break;
4194 }
4195 }
4196 }
4197
4198 /*
4199 * If we are detaching the original disk from a spare, then it implies
4200 * that the spare should become a real disk, and be removed from the
4201 * active spare list for the pool.
4202 */
4203 if (pvd->vdev_ops == &vdev_spare_ops &&
4204 vd->vdev_id == 0 &&
4205 pvd->vdev_child[pvd->vdev_children - 1]->vdev_isspare)
4206 unspare = B_TRUE;
4207
4208 /*
4209 * Erase the disk labels so the disk can be used for other things.
4210 * This must be done after all other error cases are handled,
4211 * but before we disembowel vd (so we can still do I/O to it).
4212 * But if we can't do it, don't treat the error as fatal --
4213 * it may be that the unwritability of the disk is the reason
4214 * it's being detached!
4215 */
4216 error = vdev_label_init(vd, 0, VDEV_LABEL_REMOVE);
4217
4218 /*
4219 * Remove vd from its parent and compact the parent's children.
4220 */
4221 vdev_remove_child(pvd, vd);
4222 vdev_compact_children(pvd);
4223
4224 /*
4225 * Remember one of the remaining children so we can get tvd below.
4226 */
4227 cvd = pvd->vdev_child[pvd->vdev_children - 1];
4228
4229 /*
4230 * If we need to remove the remaining child from the list of hot spares,
4231 * do it now, marking the vdev as no longer a spare in the process.
4232 * We must do this before vdev_remove_parent(), because that can
4233 * change the GUID if it creates a new toplevel GUID. For a similar
4234 * reason, we must remove the spare now, in the same txg as the detach;
4235 * otherwise someone could attach a new sibling, change the GUID, and
4236 * the subsequent attempt to spa_vdev_remove(unspare_guid) would fail.
4237 */
4238 if (unspare) {
4239 ASSERT(cvd->vdev_isspare);
4240 spa_spare_remove(cvd);
4241 unspare_guid = cvd->vdev_guid;
4242 (void) spa_vdev_remove(spa, unspare_guid, B_TRUE);
4243 cvd->vdev_unspare = B_TRUE;
4244 }
4245
4246 /*
4247 * If the parent mirror/replacing vdev only has one child,
4248 * the parent is no longer needed. Remove it from the tree.
4249 */
4250 if (pvd->vdev_children == 1) {
4251 if (pvd->vdev_ops == &vdev_spare_ops)
4252 cvd->vdev_unspare = B_FALSE;
4253 vdev_remove_parent(cvd);
4254 cvd->vdev_resilvering = B_FALSE;
4255 }
4256
4257
4258 /*
4259 * We don't set tvd until now because the parent we just removed
4260 * may have been the previous top-level vdev.
4261 */
4262 tvd = cvd->vdev_top;
4263 ASSERT(tvd->vdev_parent == rvd);
4264
4265 /*
4266 * Reevaluate the parent vdev state.
4267 */
4268 vdev_propagate_state(cvd);
4269
4270 /*
4271 * If the 'autoexpand' property is set on the pool then automatically
4272 * try to expand the size of the pool. For example if the device we
4273 * just detached was smaller than the others, it may be possible to
4274 * add metaslabs (i.e. grow the pool). We need to reopen the vdev
4275 * first so that we can obtain the updated sizes of the leaf vdevs.
4276 */
4277 if (spa->spa_autoexpand) {
4278 vdev_reopen(tvd);
4279 vdev_expand(tvd, txg);
4280 }
4281
4282 vdev_config_dirty(tvd);
4283
4284 /*
4285 * Mark vd's DTL as dirty in this txg. vdev_dtl_sync() will see that
4286 * vd->vdev_detached is set and free vd's DTL object in syncing context.
4287 * But first make sure we're not on any *other* txg's DTL list, to
4288 * prevent vd from being accessed after it's freed.
4289 */
4290 vdpath = spa_strdup(vd->vdev_path);
4291 for (int t = 0; t < TXG_SIZE; t++)
4292 (void) txg_list_remove_this(&tvd->vdev_dtl_list, vd, t);
4293 vd->vdev_detached = B_TRUE;
4294 vdev_dirty(tvd, VDD_DTL, vd, txg);
4295
4296 spa_event_notify(spa, vd, ESC_ZFS_VDEV_REMOVE);
4297
4298 /* hang on to the spa before we release the lock */
4299 spa_open_ref(spa, FTAG);
4300
4301 error = spa_vdev_exit(spa, vd, txg, 0);
4302
4303 spa_history_log_internal(LOG_POOL_VDEV_DETACH, spa, NULL,
4304 "vdev=%s", vdpath);
4305 spa_strfree(vdpath);
4306
4307 /*
4308 * If this was the removal of the original device in a hot spare vdev,
4309 * then we want to go through and remove the device from the hot spare
4310 * list of every other pool.
4311 */
4312 if (unspare) {
4313 spa_t *altspa = NULL;
4314
4315 mutex_enter(&spa_namespace_lock);
4316 while ((altspa = spa_next(altspa)) != NULL) {
4317 if (altspa->spa_state != POOL_STATE_ACTIVE ||
4318 altspa == spa)
4319 continue;
4320
4321 spa_open_ref(altspa, FTAG);
4322 mutex_exit(&spa_namespace_lock);
4323 (void) spa_vdev_remove(altspa, unspare_guid, B_TRUE);
4324 mutex_enter(&spa_namespace_lock);
4325 spa_close(altspa, FTAG);
4326 }
4327 mutex_exit(&spa_namespace_lock);
4328
4329 /* search the rest of the vdevs for spares to remove */
4330 spa_vdev_resilver_done(spa);
4331 }
4332
4333 /* all done with the spa; OK to release */
4334 mutex_enter(&spa_namespace_lock);
4335 spa_close(spa, FTAG);
4336 mutex_exit(&spa_namespace_lock);
4337
4338 return (error);
4339}
4340
4341/*
4342 * Split a set of devices from their mirrors, and create a new pool from them.
4343 */
4344int
4345spa_vdev_split_mirror(spa_t *spa, char *newname, nvlist_t *config,
4346 nvlist_t *props, boolean_t exp)
4347{
4348 int error = 0;
4349 uint64_t txg, *glist;
4350 spa_t *newspa;
4351 uint_t c, children, lastlog;
4352 nvlist_t **child, *nvl, *tmp;
4353 dmu_tx_t *tx;
4354 char *altroot = NULL;
4355 vdev_t *rvd, **vml = NULL; /* vdev modify list */
4356 boolean_t activate_slog;
4357
4358 ASSERT(spa_writeable(spa));
4359
4360 txg = spa_vdev_enter(spa);
4361
4362 /* clear the log and flush everything up to now */
4363 activate_slog = spa_passivate_log(spa);
4364 (void) spa_vdev_config_exit(spa, NULL, txg, 0, FTAG);
4365 error = spa_offline_log(spa);
4366 txg = spa_vdev_config_enter(spa);
4367
4368 if (activate_slog)
4369 spa_activate_log(spa);
4370
4371 if (error != 0)
4372 return (spa_vdev_exit(spa, NULL, txg, error));
4373
4374 /* check new spa name before going any further */
4375 if (spa_lookup(newname) != NULL)
4376 return (spa_vdev_exit(spa, NULL, txg, EEXIST));
4377
4378 /*
4379 * scan through all the children to ensure they're all mirrors
4380 */
4381 if (nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, &nvl) != 0 ||
4382 nvlist_lookup_nvlist_array(nvl, ZPOOL_CONFIG_CHILDREN, &child,
4383 &children) != 0)
4384 return (spa_vdev_exit(spa, NULL, txg, EINVAL));
4385
4386 /* first, check to ensure we've got the right child count */
4387 rvd = spa->spa_root_vdev;
4388 lastlog = 0;
4389 for (c = 0; c < rvd->vdev_children; c++) {
4390 vdev_t *vd = rvd->vdev_child[c];
4391
4392 /* don't count the holes & logs as children */
4393 if (vd->vdev_islog || vd->vdev_ishole) {
4394 if (lastlog == 0)
4395 lastlog = c;
4396 continue;
4397 }
4398
4399 lastlog = 0;
4400 }
4401 if (children != (lastlog != 0 ? lastlog : rvd->vdev_children))
4402 return (spa_vdev_exit(spa, NULL, txg, EINVAL));
4403
4404 /* next, ensure no spare or cache devices are part of the split */
4405 if (nvlist_lookup_nvlist(nvl, ZPOOL_CONFIG_SPARES, &tmp) == 0 ||
4406 nvlist_lookup_nvlist(nvl, ZPOOL_CONFIG_L2CACHE, &tmp) == 0)
4407 return (spa_vdev_exit(spa, NULL, txg, EINVAL));
4408
4409 vml = kmem_zalloc(children * sizeof (vdev_t *), KM_SLEEP);
4410 glist = kmem_zalloc(children * sizeof (uint64_t), KM_SLEEP);
4411
4412 /* then, loop over each vdev and validate it */
4413 for (c = 0; c < children; c++) {
4414 uint64_t is_hole = 0;
4415
4416 (void) nvlist_lookup_uint64(child[c], ZPOOL_CONFIG_IS_HOLE,
4417 &is_hole);
4418
4419 if (is_hole != 0) {
4420 if (spa->spa_root_vdev->vdev_child[c]->vdev_ishole ||
4421 spa->spa_root_vdev->vdev_child[c]->vdev_islog) {
4422 continue;
4423 } else {
4424 error = EINVAL;
4425 break;
4426 }
4427 }
4428
4429 /* which disk is going to be split? */
4430 if (nvlist_lookup_uint64(child[c], ZPOOL_CONFIG_GUID,
4431 &glist[c]) != 0) {
4432 error = EINVAL;
4433 break;
4434 }
4435
4436 /* look it up in the spa */
4437 vml[c] = spa_lookup_by_guid(spa, glist[c], B_FALSE);
4438 if (vml[c] == NULL) {
4439 error = ENODEV;
4440 break;
4441 }
4442
4443 /* make sure there's nothing stopping the split */
4444 if (vml[c]->vdev_parent->vdev_ops != &vdev_mirror_ops ||
4445 vml[c]->vdev_islog ||
4446 vml[c]->vdev_ishole ||
4447 vml[c]->vdev_isspare ||
4448 vml[c]->vdev_isl2cache ||
4449 !vdev_writeable(vml[c]) ||
4450 vml[c]->vdev_children != 0 ||
4451 vml[c]->vdev_state != VDEV_STATE_HEALTHY ||
4452 c != spa->spa_root_vdev->vdev_child[c]->vdev_id) {
4453 error = EINVAL;
4454 break;
4455 }
4456
4457 if (vdev_dtl_required(vml[c])) {
4458 error = EBUSY;
4459 break;
4460 }
4461
4462 /* we need certain info from the top level */
4463 VERIFY(nvlist_add_uint64(child[c], ZPOOL_CONFIG_METASLAB_ARRAY,
4464 vml[c]->vdev_top->vdev_ms_array) == 0);
4465 VERIFY(nvlist_add_uint64(child[c], ZPOOL_CONFIG_METASLAB_SHIFT,
4466 vml[c]->vdev_top->vdev_ms_shift) == 0);
4467 VERIFY(nvlist_add_uint64(child[c], ZPOOL_CONFIG_ASIZE,
4468 vml[c]->vdev_top->vdev_asize) == 0);
4469 VERIFY(nvlist_add_uint64(child[c], ZPOOL_CONFIG_ASHIFT,
4470 vml[c]->vdev_top->vdev_ashift) == 0);
4471 }
4472
4473 if (error != 0) {
4474 kmem_free(vml, children * sizeof (vdev_t *));
4475 kmem_free(glist, children * sizeof (uint64_t));
4476 return (spa_vdev_exit(spa, NULL, txg, error));
4477 }
4478
4479 /* stop writers from using the disks */
4480 for (c = 0; c < children; c++) {
4481 if (vml[c] != NULL)
4482 vml[c]->vdev_offline = B_TRUE;
4483 }
4484 vdev_reopen(spa->spa_root_vdev);
4485
4486 /*
4487 * Temporarily record the splitting vdevs in the spa config. This
4488 * will disappear once the config is regenerated.
4489 */
4490 VERIFY(nvlist_alloc(&nvl, NV_UNIQUE_NAME, KM_SLEEP) == 0);
4491 VERIFY(nvlist_add_uint64_array(nvl, ZPOOL_CONFIG_SPLIT_LIST,
4492 glist, children) == 0);
4493 kmem_free(glist, children * sizeof (uint64_t));
4494
4495 mutex_enter(&spa->spa_props_lock);
4496 VERIFY(nvlist_add_nvlist(spa->spa_config, ZPOOL_CONFIG_SPLIT,
4497 nvl) == 0);
4498 mutex_exit(&spa->spa_props_lock);
4499 spa->spa_config_splitting = nvl;
4500 vdev_config_dirty(spa->spa_root_vdev);
4501
4502 /* configure and create the new pool */
4503 VERIFY(nvlist_add_string(config, ZPOOL_CONFIG_POOL_NAME, newname) == 0);
4504 VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_POOL_STATE,
4505 exp ? POOL_STATE_EXPORTED : POOL_STATE_ACTIVE) == 0);
4506 VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_VERSION,
4507 spa_version(spa)) == 0);
4508 VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_POOL_TXG,
4509 spa->spa_config_txg) == 0);
4510 VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_POOL_GUID,
4511 spa_generate_guid(NULL)) == 0);
4512 (void) nvlist_lookup_string(props,
4513 zpool_prop_to_name(ZPOOL_PROP_ALTROOT), &altroot);
4514
4515 /* add the new pool to the namespace */
4516 newspa = spa_add(newname, config, altroot);
4517 newspa->spa_config_txg = spa->spa_config_txg;
4518 spa_set_log_state(newspa, SPA_LOG_CLEAR);
4519
4520 /* release the spa config lock, retaining the namespace lock */
4521 spa_vdev_config_exit(spa, NULL, txg, 0, FTAG);
4522
4523 if (zio_injection_enabled)
4524 zio_handle_panic_injection(spa, FTAG, 1);
4525
4526 spa_activate(newspa, spa_mode_global);
4527 spa_async_suspend(newspa);
4528
4529#ifndef sun
4530 /* mark that we are creating new spa by splitting */
4531 newspa->spa_splitting_newspa = B_TRUE;
4532#endif
4533 /* create the new pool from the disks of the original pool */
4534 error = spa_load(newspa, SPA_LOAD_IMPORT, SPA_IMPORT_ASSEMBLE, B_TRUE);
4535#ifndef sun
4536 newspa->spa_splitting_newspa = B_FALSE;
4537#endif
4538 if (error)
4539 goto out;
4540
4541 /* if that worked, generate a real config for the new pool */
4542 if (newspa->spa_root_vdev != NULL) {
4543 VERIFY(nvlist_alloc(&newspa->spa_config_splitting,
4544 NV_UNIQUE_NAME, KM_SLEEP) == 0);
4545 VERIFY(nvlist_add_uint64(newspa->spa_config_splitting,
4546 ZPOOL_CONFIG_SPLIT_GUID, spa_guid(spa)) == 0);
4547 spa_config_set(newspa, spa_config_generate(newspa, NULL, -1ULL,
4548 B_TRUE));
4549 }
4550
4551 /* set the props */
4552 if (props != NULL) {
4553 spa_configfile_set(newspa, props, B_FALSE);
4554 error = spa_prop_set(newspa, props);
4555 if (error)
4556 goto out;
4557 }
4558
4559 /* flush everything */
4560 txg = spa_vdev_config_enter(newspa);
4561 vdev_config_dirty(newspa->spa_root_vdev);
4562 (void) spa_vdev_config_exit(newspa, NULL, txg, 0, FTAG);
4563
4564 if (zio_injection_enabled)
4565 zio_handle_panic_injection(spa, FTAG, 2);
4566
4567 spa_async_resume(newspa);
4568
4569 /* finally, update the original pool's config */
4570 txg = spa_vdev_config_enter(spa);
4571 tx = dmu_tx_create_dd(spa_get_dsl(spa)->dp_mos_dir);
4572 error = dmu_tx_assign(tx, TXG_WAIT);
4573 if (error != 0)
4574 dmu_tx_abort(tx);
4575 for (c = 0; c < children; c++) {
4576 if (vml[c] != NULL) {
4577 vdev_split(vml[c]);
4578 if (error == 0)
4579 spa_history_log_internal(LOG_POOL_VDEV_DETACH,
4580 spa, tx, "vdev=%s",
4581 vml[c]->vdev_path);
4582 vdev_free(vml[c]);
4583 }
4584 }
4585 vdev_config_dirty(spa->spa_root_vdev);
4586 spa->spa_config_splitting = NULL;
4587 nvlist_free(nvl);
4588 if (error == 0)
4589 dmu_tx_commit(tx);
4590 (void) spa_vdev_exit(spa, NULL, txg, 0);
4591
4592 if (zio_injection_enabled)
4593 zio_handle_panic_injection(spa, FTAG, 3);
4594
4595 /* split is complete; log a history record */
4596 spa_history_log_internal(LOG_POOL_SPLIT, newspa, NULL,
4597 "split new pool %s from pool %s", newname, spa_name(spa));
4598
4599 kmem_free(vml, children * sizeof (vdev_t *));
4600
4601 /* if we're not going to mount the filesystems in userland, export */
4602 if (exp)
4603 error = spa_export_common(newname, POOL_STATE_EXPORTED, NULL,
4604 B_FALSE, B_FALSE);
4605
4606 return (error);
4607
4608out:
4609 spa_unload(newspa);
4610 spa_deactivate(newspa);
4611 spa_remove(newspa);
4612
4613 txg = spa_vdev_config_enter(spa);
4614
4615 /* re-online all offlined disks */
4616 for (c = 0; c < children; c++) {
4617 if (vml[c] != NULL)
4618 vml[c]->vdev_offline = B_FALSE;
4619 }
4620 vdev_reopen(spa->spa_root_vdev);
4621
4622 nvlist_free(spa->spa_config_splitting);
4623 spa->spa_config_splitting = NULL;
4624 (void) spa_vdev_exit(spa, NULL, txg, error);
4625
4626 kmem_free(vml, children * sizeof (vdev_t *));
4627 return (error);
4628}
4629
4630static nvlist_t *
4631spa_nvlist_lookup_by_guid(nvlist_t **nvpp, int count, uint64_t target_guid)
4632{
4633 for (int i = 0; i < count; i++) {
4634 uint64_t guid;
4635
4636 VERIFY(nvlist_lookup_uint64(nvpp[i], ZPOOL_CONFIG_GUID,
4637 &guid) == 0);
4638
4639 if (guid == target_guid)
4640 return (nvpp[i]);
4641 }
4642
4643 return (NULL);
4644}
4645
4646static void
4647spa_vdev_remove_aux(nvlist_t *config, char *name, nvlist_t **dev, int count,
4648 nvlist_t *dev_to_remove)
4649{
4650 nvlist_t **newdev = NULL;
4651
4652 if (count > 1)
4653 newdev = kmem_alloc((count - 1) * sizeof (void *), KM_SLEEP);
4654
4655 for (int i = 0, j = 0; i < count; i++) {
4656 if (dev[i] == dev_to_remove)
4657 continue;
4658 VERIFY(nvlist_dup(dev[i], &newdev[j++], KM_SLEEP) == 0);
4659 }
4660
4661 VERIFY(nvlist_remove(config, name, DATA_TYPE_NVLIST_ARRAY) == 0);
4662 VERIFY(nvlist_add_nvlist_array(config, name, newdev, count - 1) == 0);
4663
4664 for (int i = 0; i < count - 1; i++)
4665 nvlist_free(newdev[i]);
4666
4667 if (count > 1)
4668 kmem_free(newdev, (count - 1) * sizeof (void *));
4669}
4670
4671/*
4672 * Evacuate the device.
4673 */
4674static int
4675spa_vdev_remove_evacuate(spa_t *spa, vdev_t *vd)
4676{
4677 uint64_t txg;
4678 int error = 0;
4679
4680 ASSERT(MUTEX_HELD(&spa_namespace_lock));
4681 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == 0);
4682 ASSERT(vd == vd->vdev_top);
4683
4684 /*
4685 * Evacuate the device. We don't hold the config lock as writer
4686 * since we need to do I/O but we do keep the
4687 * spa_namespace_lock held. Once this completes the device
4688 * should no longer have any blocks allocated on it.
4689 */
4690 if (vd->vdev_islog) {
4691 if (vd->vdev_stat.vs_alloc != 0)
4692 error = spa_offline_log(spa);
4693 } else {
4694 error = ENOTSUP;
4695 }
4696
4697 if (error)
4698 return (error);
4699
4700 /*
4701 * The evacuation succeeded. Remove any remaining MOS metadata
4702 * associated with this vdev, and wait for these changes to sync.
4703 */
4704 ASSERT3U(vd->vdev_stat.vs_alloc, ==, 0);
4705 txg = spa_vdev_config_enter(spa);
4706 vd->vdev_removing = B_TRUE;
4707 vdev_dirty(vd, 0, NULL, txg);
4708 vdev_config_dirty(vd);
4709 spa_vdev_config_exit(spa, NULL, txg, 0, FTAG);
4710
4711 return (0);
4712}
4713
4714/*
4715 * Complete the removal by cleaning up the namespace.
4716 */
4717static void
4718spa_vdev_remove_from_namespace(spa_t *spa, vdev_t *vd)
4719{
4720 vdev_t *rvd = spa->spa_root_vdev;
4721 uint64_t id = vd->vdev_id;
4722 boolean_t last_vdev = (id == (rvd->vdev_children - 1));
4723
4724 ASSERT(MUTEX_HELD(&spa_namespace_lock));
4725 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL);
4726 ASSERT(vd == vd->vdev_top);
4727
4728 /*
4729 * Only remove any devices which are empty.
4730 */
4731 if (vd->vdev_stat.vs_alloc != 0)
4732 return;
4733
4734 (void) vdev_label_init(vd, 0, VDEV_LABEL_REMOVE);
4735
4736 if (list_link_active(&vd->vdev_state_dirty_node))
4737 vdev_state_clean(vd);
4738 if (list_link_active(&vd->vdev_config_dirty_node))
4739 vdev_config_clean(vd);
4740
4741 vdev_free(vd);
4742
4743 if (last_vdev) {
4744 vdev_compact_children(rvd);
4745 } else {
4746 vd = vdev_alloc_common(spa, id, 0, &vdev_hole_ops);
4747 vdev_add_child(rvd, vd);
4748 }
4749 vdev_config_dirty(rvd);
4750
4751 /*
4752 * Reassess the health of our root vdev.
4753 */
4754 vdev_reopen(rvd);
4755}
4756
4757/*
4758 * Remove a device from the pool -
4759 *
4760 * Removing a device from the vdev namespace requires several steps
4761 * and can take a significant amount of time. As a result we use
4762 * the spa_vdev_config_[enter/exit] functions which allow us to
4763 * grab and release the spa_config_lock while still holding the namespace
4764 * lock. During each step the configuration is synced out.
4765 */
4766
4767/*
4768 * Remove a device from the pool. Currently, this supports removing only hot
4769 * spares, slogs, and level 2 ARC devices.
4770 */
4771int
4772spa_vdev_remove(spa_t *spa, uint64_t guid, boolean_t unspare)
4773{
4774 vdev_t *vd;
4775 metaslab_group_t *mg;
4776 nvlist_t **spares, **l2cache, *nv;
4777 uint64_t txg = 0;
4778 uint_t nspares, nl2cache;
4779 int error = 0;
4780 boolean_t locked = MUTEX_HELD(&spa_namespace_lock);
4781
4782 ASSERT(spa_writeable(spa));
4783
4784 if (!locked)
4785 txg = spa_vdev_enter(spa);
4786
4787 vd = spa_lookup_by_guid(spa, guid, B_FALSE);
4788
4789 if (spa->spa_spares.sav_vdevs != NULL &&
4790 nvlist_lookup_nvlist_array(spa->spa_spares.sav_config,
4791 ZPOOL_CONFIG_SPARES, &spares, &nspares) == 0 &&
4792 (nv = spa_nvlist_lookup_by_guid(spares, nspares, guid)) != NULL) {
4793 /*
4794 * Only remove the hot spare if it's not currently in use
4795 * in this pool.
4796 */
4797 if (vd == NULL || unspare) {
4798 spa_vdev_remove_aux(spa->spa_spares.sav_config,
4799 ZPOOL_CONFIG_SPARES, spares, nspares, nv);
4800 spa_load_spares(spa);
4801 spa->spa_spares.sav_sync = B_TRUE;
4802 } else {
4803 error = EBUSY;
4804 }
4805 } else if (spa->spa_l2cache.sav_vdevs != NULL &&
4806 nvlist_lookup_nvlist_array(spa->spa_l2cache.sav_config,
4807 ZPOOL_CONFIG_L2CACHE, &l2cache, &nl2cache) == 0 &&
4808 (nv = spa_nvlist_lookup_by_guid(l2cache, nl2cache, guid)) != NULL) {
4809 /*
4810 * Cache devices can always be removed.
4811 */
4812 spa_vdev_remove_aux(spa->spa_l2cache.sav_config,
4813 ZPOOL_CONFIG_L2CACHE, l2cache, nl2cache, nv);
4814 spa_load_l2cache(spa);
4815 spa->spa_l2cache.sav_sync = B_TRUE;
4816 } else if (vd != NULL && vd->vdev_islog) {
4817 ASSERT(!locked);
4818 ASSERT(vd == vd->vdev_top);
4819
4820 /*
4821 * XXX - Once we have bp-rewrite this should
4822 * become the common case.
4823 */
4824
4825 mg = vd->vdev_mg;
4826
4827 /*
4828 * Stop allocating from this vdev.
4829 */
4830 metaslab_group_passivate(mg);
4831
4832 /*
4833 * Wait for the youngest allocations and frees to sync,
4834 * and then wait for the deferral of those frees to finish.
4835 */
4836 spa_vdev_config_exit(spa, NULL,
4837 txg + TXG_CONCURRENT_STATES + TXG_DEFER_SIZE, 0, FTAG);
4838
4839 /*
4840 * Attempt to evacuate the vdev.
4841 */
4842 error = spa_vdev_remove_evacuate(spa, vd);
4843
4844 txg = spa_vdev_config_enter(spa);
4845
4846 /*
4847 * If we couldn't evacuate the vdev, unwind.
4848 */
4849 if (error) {
4850 metaslab_group_activate(mg);
4851 return (spa_vdev_exit(spa, NULL, txg, error));
4852 }
4853
4854 /*
4855 * Clean up the vdev namespace.
4856 */
4857 spa_vdev_remove_from_namespace(spa, vd);
4858
4859 } else if (vd != NULL) {
4860 /*
4861 * Normal vdevs cannot be removed (yet).
4862 */
4863 error = ENOTSUP;
4864 } else {
4865 /*
4866 * There is no vdev of any kind with the specified guid.
4867 */
4868 error = ENOENT;
4869 }
4870
4871 if (!locked)
4872 return (spa_vdev_exit(spa, NULL, txg, error));
4873
4874 return (error);
4875}
4876
4877/*
4878 * Find any device that's done replacing, or a vdev marked 'unspare' that's
4879 * current spared, so we can detach it.
4880 */
4881static vdev_t *
4882spa_vdev_resilver_done_hunt(vdev_t *vd)
4883{
4884 vdev_t *newvd, *oldvd;
4885
4886 for (int c = 0; c < vd->vdev_children; c++) {
4887 oldvd = spa_vdev_resilver_done_hunt(vd->vdev_child[c]);
4888 if (oldvd != NULL)
4889 return (oldvd);
4890 }
4891
4892 /*
4893 * Check for a completed replacement. We always consider the first
4894 * vdev in the list to be the oldest vdev, and the last one to be
4895 * the newest (see spa_vdev_attach() for how that works). In
4896 * the case where the newest vdev is faulted, we will not automatically
4897 * remove it after a resilver completes. This is OK as it will require
4898 * user intervention to determine which disk the admin wishes to keep.
4899 */
4900 if (vd->vdev_ops == &vdev_replacing_ops) {
4901 ASSERT(vd->vdev_children > 1);
4902
4903 newvd = vd->vdev_child[vd->vdev_children - 1];
4904 oldvd = vd->vdev_child[0];
4905
4906 if (vdev_dtl_empty(newvd, DTL_MISSING) &&
4907 vdev_dtl_empty(newvd, DTL_OUTAGE) &&
4908 !vdev_dtl_required(oldvd))
4909 return (oldvd);
4910 }
4911
4912 /*
4913 * Check for a completed resilver with the 'unspare' flag set.
4914 */
4915 if (vd->vdev_ops == &vdev_spare_ops) {
4916 vdev_t *first = vd->vdev_child[0];
4917 vdev_t *last = vd->vdev_child[vd->vdev_children - 1];
4918
4919 if (last->vdev_unspare) {
4920 oldvd = first;
4921 newvd = last;
4922 } else if (first->vdev_unspare) {
4923 oldvd = last;
4924 newvd = first;
4925 } else {
4926 oldvd = NULL;
4927 }
4928
4929 if (oldvd != NULL &&
4930 vdev_dtl_empty(newvd, DTL_MISSING) &&
4931 vdev_dtl_empty(newvd, DTL_OUTAGE) &&
4932 !vdev_dtl_required(oldvd))
4933 return (oldvd);
4934
4935 /*
4936 * If there are more than two spares attached to a disk,
4937 * and those spares are not required, then we want to
4938 * attempt to free them up now so that they can be used
4939 * by other pools. Once we're back down to a single
4940 * disk+spare, we stop removing them.
4941 */
4942 if (vd->vdev_children > 2) {
4943 newvd = vd->vdev_child[1];
4944
4945 if (newvd->vdev_isspare && last->vdev_isspare &&
4946 vdev_dtl_empty(last, DTL_MISSING) &&
4947 vdev_dtl_empty(last, DTL_OUTAGE) &&
4948 !vdev_dtl_required(newvd))
4949 return (newvd);
4950 }
4951 }
4952
4953 return (NULL);
4954}
4955
4956static void
4957spa_vdev_resilver_done(spa_t *spa)
4958{
4959 vdev_t *vd, *pvd, *ppvd;
4960 uint64_t guid, sguid, pguid, ppguid;
4961
4962 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
4963
4964 while ((vd = spa_vdev_resilver_done_hunt(spa->spa_root_vdev)) != NULL) {
4965 pvd = vd->vdev_parent;
4966 ppvd = pvd->vdev_parent;
4967 guid = vd->vdev_guid;
4968 pguid = pvd->vdev_guid;
4969 ppguid = ppvd->vdev_guid;
4970 sguid = 0;
4971 /*
4972 * If we have just finished replacing a hot spared device, then
4973 * we need to detach the parent's first child (the original hot
4974 * spare) as well.
4975 */
4976 if (ppvd->vdev_ops == &vdev_spare_ops && pvd->vdev_id == 0 &&
4977 ppvd->vdev_children == 2) {
4978 ASSERT(pvd->vdev_ops == &vdev_replacing_ops);
4979 sguid = ppvd->vdev_child[1]->vdev_guid;
4980 }
4981 spa_config_exit(spa, SCL_ALL, FTAG);
4982 if (spa_vdev_detach(spa, guid, pguid, B_TRUE) != 0)
4983 return;
4984 if (sguid && spa_vdev_detach(spa, sguid, ppguid, B_TRUE) != 0)
4985 return;
4986 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
4987 }
4988
4989 spa_config_exit(spa, SCL_ALL, FTAG);
4990}
4991
4992/*
4993 * Update the stored path or FRU for this vdev.
4994 */
4995int
4996spa_vdev_set_common(spa_t *spa, uint64_t guid, const char *value,
4997 boolean_t ispath)
4998{
4999 vdev_t *vd;
5000 boolean_t sync = B_FALSE;
5001
5002 ASSERT(spa_writeable(spa));
5003
5004 spa_vdev_state_enter(spa, SCL_ALL);
5005
5006 if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL)
5007 return (spa_vdev_state_exit(spa, NULL, ENOENT));
5008
5009 if (!vd->vdev_ops->vdev_op_leaf)
5010 return (spa_vdev_state_exit(spa, NULL, ENOTSUP));
5011
5012 if (ispath) {
5013 if (strcmp(value, vd->vdev_path) != 0) {
5014 spa_strfree(vd->vdev_path);
5015 vd->vdev_path = spa_strdup(value);
5016 sync = B_TRUE;
5017 }
5018 } else {
5019 if (vd->vdev_fru == NULL) {
5020 vd->vdev_fru = spa_strdup(value);
5021 sync = B_TRUE;
5022 } else if (strcmp(value, vd->vdev_fru) != 0) {
5023 spa_strfree(vd->vdev_fru);
5024 vd->vdev_fru = spa_strdup(value);
5025 sync = B_TRUE;
5026 }
5027 }
5028
5029 return (spa_vdev_state_exit(spa, sync ? vd : NULL, 0));
5030}
5031
5032int
5033spa_vdev_setpath(spa_t *spa, uint64_t guid, const char *newpath)
5034{
5035 return (spa_vdev_set_common(spa, guid, newpath, B_TRUE));
5036}
5037
5038int
5039spa_vdev_setfru(spa_t *spa, uint64_t guid, const char *newfru)
5040{
5041 return (spa_vdev_set_common(spa, guid, newfru, B_FALSE));
5042}
5043
5044/*
5045 * ==========================================================================
5046 * SPA Scanning
5047 * ==========================================================================
5048 */
5049
5050int
5051spa_scan_stop(spa_t *spa)
5052{
5053 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == 0);
5054 if (dsl_scan_resilvering(spa->spa_dsl_pool))
5055 return (EBUSY);
5056 return (dsl_scan_cancel(spa->spa_dsl_pool));
5057}
5058
5059int
5060spa_scan(spa_t *spa, pool_scan_func_t func)
5061{
5062 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == 0);
5063
5064 if (func >= POOL_SCAN_FUNCS || func == POOL_SCAN_NONE)
5065 return (ENOTSUP);
5066
5067 /*
5068 * If a resilver was requested, but there is no DTL on a
5069 * writeable leaf device, we have nothing to do.
5070 */
5071 if (func == POOL_SCAN_RESILVER &&
5072 !vdev_resilver_needed(spa->spa_root_vdev, NULL, NULL)) {
5073 spa_async_request(spa, SPA_ASYNC_RESILVER_DONE);
5074 return (0);
5075 }
5076
5077 return (dsl_scan(spa->spa_dsl_pool, func));
5078}
5079
5080/*
5081 * ==========================================================================
5082 * SPA async task processing
5083 * ==========================================================================
5084 */
5085
5086static void
5087spa_async_remove(spa_t *spa, vdev_t *vd)
5088{
5089 if (vd->vdev_remove_wanted) {
5090 vd->vdev_remove_wanted = B_FALSE;
5091 vd->vdev_delayed_close = B_FALSE;
5092 vdev_set_state(vd, B_FALSE, VDEV_STATE_REMOVED, VDEV_AUX_NONE);
5093
5094 /*
5095 * We want to clear the stats, but we don't want to do a full
5096 * vdev_clear() as that will cause us to throw away
5097 * degraded/faulted state as well as attempt to reopen the
5098 * device, all of which is a waste.
5099 */
5100 vd->vdev_stat.vs_read_errors = 0;
5101 vd->vdev_stat.vs_write_errors = 0;
5102 vd->vdev_stat.vs_checksum_errors = 0;
5103
5104 vdev_state_dirty(vd->vdev_top);
5105 }
5106
5107 for (int c = 0; c < vd->vdev_children; c++)
5108 spa_async_remove(spa, vd->vdev_child[c]);
5109}
5110
5111static void
5112spa_async_probe(spa_t *spa, vdev_t *vd)
5113{
5114 if (vd->vdev_probe_wanted) {
5115 vd->vdev_probe_wanted = B_FALSE;
5116 vdev_reopen(vd); /* vdev_open() does the actual probe */
5117 }
5118
5119 for (int c = 0; c < vd->vdev_children; c++)
5120 spa_async_probe(spa, vd->vdev_child[c]);
5121}
5122
5123static void
5124spa_async_autoexpand(spa_t *spa, vdev_t *vd)
5125{
5126 sysevent_id_t eid;
5127 nvlist_t *attr;
5128 char *physpath;
5129
5130 if (!spa->spa_autoexpand)
5131 return;
5132
5133 for (int c = 0; c < vd->vdev_children; c++) {
5134 vdev_t *cvd = vd->vdev_child[c];
5135 spa_async_autoexpand(spa, cvd);
5136 }
5137
5138 if (!vd->vdev_ops->vdev_op_leaf || vd->vdev_physpath == NULL)
5139 return;
5140
5141 physpath = kmem_zalloc(MAXPATHLEN, KM_SLEEP);
5142 (void) snprintf(physpath, MAXPATHLEN, "/devices%s", vd->vdev_physpath);
5143
5144 VERIFY(nvlist_alloc(&attr, NV_UNIQUE_NAME, KM_SLEEP) == 0);
5145 VERIFY(nvlist_add_string(attr, DEV_PHYS_PATH, physpath) == 0);
5146
5147 (void) ddi_log_sysevent(zfs_dip, SUNW_VENDOR, EC_DEV_STATUS,
5148 ESC_ZFS_VDEV_AUTOEXPAND, attr, &eid, DDI_SLEEP);
5149
5150 nvlist_free(attr);
5151 kmem_free(physpath, MAXPATHLEN);
5152}
5153
5154static void
5155spa_async_thread(void *arg)
5156{
5157 spa_t *spa = arg;
5158 int tasks;
5159
5160 ASSERT(spa->spa_sync_on);
5161
5162 mutex_enter(&spa->spa_async_lock);
5163 tasks = spa->spa_async_tasks;
5164 spa->spa_async_tasks = 0;
5165 mutex_exit(&spa->spa_async_lock);
5166
5167 /*
5168 * See if the config needs to be updated.
5169 */
5170 if (tasks & SPA_ASYNC_CONFIG_UPDATE) {
5171 uint64_t old_space, new_space;
5172
5173 mutex_enter(&spa_namespace_lock);
5174 old_space = metaslab_class_get_space(spa_normal_class(spa));
5175 spa_config_update(spa, SPA_CONFIG_UPDATE_POOL);
5176 new_space = metaslab_class_get_space(spa_normal_class(spa));
5177 mutex_exit(&spa_namespace_lock);
5178
5179 /*
5180 * If the pool grew as a result of the config update,
5181 * then log an internal history event.
5182 */
5183 if (new_space != old_space) {
5184 spa_history_log_internal(LOG_POOL_VDEV_ONLINE,
5185 spa, NULL,
5186 "pool '%s' size: %llu(+%llu)",
5187 spa_name(spa), new_space, new_space - old_space);
5188 }
5189 }
5190
5191 /*
5192 * See if any devices need to be marked REMOVED.
5193 */
5194 if (tasks & SPA_ASYNC_REMOVE) {
5195 spa_vdev_state_enter(spa, SCL_NONE);
5196 spa_async_remove(spa, spa->spa_root_vdev);
5197 for (int i = 0; i < spa->spa_l2cache.sav_count; i++)
5198 spa_async_remove(spa, spa->spa_l2cache.sav_vdevs[i]);
5199 for (int i = 0; i < spa->spa_spares.sav_count; i++)
5200 spa_async_remove(spa, spa->spa_spares.sav_vdevs[i]);
5201 (void) spa_vdev_state_exit(spa, NULL, 0);
5202 }
5203
5204 if ((tasks & SPA_ASYNC_AUTOEXPAND) && !spa_suspended(spa)) {
5205 spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER);
5206 spa_async_autoexpand(spa, spa->spa_root_vdev);
5207 spa_config_exit(spa, SCL_CONFIG, FTAG);
5208 }
5209
5210 /*
5211 * See if any devices need to be probed.
5212 */
5213 if (tasks & SPA_ASYNC_PROBE) {
5214 spa_vdev_state_enter(spa, SCL_NONE);
5215 spa_async_probe(spa, spa->spa_root_vdev);
5216 (void) spa_vdev_state_exit(spa, NULL, 0);
5217 }
5218
5219 /*
5220 * If any devices are done replacing, detach them.
5221 */
5222 if (tasks & SPA_ASYNC_RESILVER_DONE)
5223 spa_vdev_resilver_done(spa);
5224
5225 /*
5226 * Kick off a resilver.
5227 */
5228 if (tasks & SPA_ASYNC_RESILVER)
5229 dsl_resilver_restart(spa->spa_dsl_pool, 0);
5230
5231 /*
5232 * Let the world know that we're done.
5233 */
5234 mutex_enter(&spa->spa_async_lock);
5235 spa->spa_async_thread = NULL;
5236 cv_broadcast(&spa->spa_async_cv);
5237 mutex_exit(&spa->spa_async_lock);
5238 thread_exit();
5239}
5240
5241void
5242spa_async_suspend(spa_t *spa)
5243{
5244 mutex_enter(&spa->spa_async_lock);
5245 spa->spa_async_suspended++;
5246 while (spa->spa_async_thread != NULL)
5247 cv_wait(&spa->spa_async_cv, &spa->spa_async_lock);
5248 mutex_exit(&spa->spa_async_lock);
5249}
5250
5251void
5252spa_async_resume(spa_t *spa)
5253{
5254 mutex_enter(&spa->spa_async_lock);
5255 ASSERT(spa->spa_async_suspended != 0);
5256 spa->spa_async_suspended--;
5257 mutex_exit(&spa->spa_async_lock);
5258}
5259
5260static void
5261spa_async_dispatch(spa_t *spa)
5262{
5263 mutex_enter(&spa->spa_async_lock);
5264 if (spa->spa_async_tasks && !spa->spa_async_suspended &&
5265 spa->spa_async_thread == NULL &&
5266 rootdir != NULL && !vn_is_readonly(rootdir))
5267 spa->spa_async_thread = thread_create(NULL, 0,
5268 spa_async_thread, spa, 0, &p0, TS_RUN, maxclsyspri);
5269 mutex_exit(&spa->spa_async_lock);
5270}
5271
5272void
5273spa_async_request(spa_t *spa, int task)
5274{
5275 zfs_dbgmsg("spa=%s async request task=%u", spa->spa_name, task);
5276 mutex_enter(&spa->spa_async_lock);
5277 spa->spa_async_tasks |= task;
5278 mutex_exit(&spa->spa_async_lock);
5279}
5280
5281/*
5282 * ==========================================================================
5283 * SPA syncing routines
5284 * ==========================================================================
5285 */
5286
5287static int
5288bpobj_enqueue_cb(void *arg, const blkptr_t *bp, dmu_tx_t *tx)
5289{
5290 bpobj_t *bpo = arg;
5291 bpobj_enqueue(bpo, bp, tx);
5292 return (0);
5293}
5294
5295static int
5296spa_free_sync_cb(void *arg, const blkptr_t *bp, dmu_tx_t *tx)
5297{
5298 zio_t *zio = arg;
5299
5300 zio_nowait(zio_free_sync(zio, zio->io_spa, dmu_tx_get_txg(tx), bp,
5301 zio->io_flags));
5302 return (0);
5303}
5304
5305static void
5306spa_sync_nvlist(spa_t *spa, uint64_t obj, nvlist_t *nv, dmu_tx_t *tx)
5307{
5308 char *packed = NULL;
5309 size_t bufsize;
5310 size_t nvsize = 0;
5311 dmu_buf_t *db;
5312
5313 VERIFY(nvlist_size(nv, &nvsize, NV_ENCODE_XDR) == 0);
5314
5315 /*
5316 * Write full (SPA_CONFIG_BLOCKSIZE) blocks of configuration
5317 * information. This avoids the dbuf_will_dirty() path and
5318 * saves us a pre-read to get data we don't actually care about.
5319 */
5320 bufsize = P2ROUNDUP(nvsize, SPA_CONFIG_BLOCKSIZE);
5321 packed = kmem_alloc(bufsize, KM_SLEEP);
5322
5323 VERIFY(nvlist_pack(nv, &packed, &nvsize, NV_ENCODE_XDR,
5324 KM_SLEEP) == 0);
5325 bzero(packed + nvsize, bufsize - nvsize);
5326
5327 dmu_write(spa->spa_meta_objset, obj, 0, bufsize, packed, tx);
5328
5329 kmem_free(packed, bufsize);
5330
5331 VERIFY(0 == dmu_bonus_hold(spa->spa_meta_objset, obj, FTAG, &db));
5332 dmu_buf_will_dirty(db, tx);
5333 *(uint64_t *)db->db_data = nvsize;
5334 dmu_buf_rele(db, FTAG);
5335}
5336
5337static void
5338spa_sync_aux_dev(spa_t *spa, spa_aux_vdev_t *sav, dmu_tx_t *tx,
5339 const char *config, const char *entry)
5340{
5341 nvlist_t *nvroot;
5342 nvlist_t **list;
5343 int i;
5344
5345 if (!sav->sav_sync)
5346 return;
5347
5348 /*
5349 * Update the MOS nvlist describing the list of available devices.
5350 * spa_validate_aux() will have already made sure this nvlist is
5351 * valid and the vdevs are labeled appropriately.
5352 */
5353 if (sav->sav_object == 0) {
5354 sav->sav_object = dmu_object_alloc(spa->spa_meta_objset,
5355 DMU_OT_PACKED_NVLIST, 1 << 14, DMU_OT_PACKED_NVLIST_SIZE,
5356 sizeof (uint64_t), tx);
5357 VERIFY(zap_update(spa->spa_meta_objset,
5358 DMU_POOL_DIRECTORY_OBJECT, entry, sizeof (uint64_t), 1,
5359 &sav->sav_object, tx) == 0);
5360 }
5361
5362 VERIFY(nvlist_alloc(&nvroot, NV_UNIQUE_NAME, KM_SLEEP) == 0);
5363 if (sav->sav_count == 0) {
5364 VERIFY(nvlist_add_nvlist_array(nvroot, config, NULL, 0) == 0);
5365 } else {
5366 list = kmem_alloc(sav->sav_count * sizeof (void *), KM_SLEEP);
5367 for (i = 0; i < sav->sav_count; i++)
5368 list[i] = vdev_config_generate(spa, sav->sav_vdevs[i],
5369 B_FALSE, VDEV_CONFIG_L2CACHE);
5370 VERIFY(nvlist_add_nvlist_array(nvroot, config, list,
5371 sav->sav_count) == 0);
5372 for (i = 0; i < sav->sav_count; i++)
5373 nvlist_free(list[i]);
5374 kmem_free(list, sav->sav_count * sizeof (void *));
5375 }
5376
5377 spa_sync_nvlist(spa, sav->sav_object, nvroot, tx);
5378 nvlist_free(nvroot);
5379
5380 sav->sav_sync = B_FALSE;
5381}
5382
5383static void
5384spa_sync_config_object(spa_t *spa, dmu_tx_t *tx)
5385{
5386 nvlist_t *config;
5387
5388 if (list_is_empty(&spa->spa_config_dirty_list))
5389 return;
5390
5391 spa_config_enter(spa, SCL_STATE, FTAG, RW_READER);
5392
5393 config = spa_config_generate(spa, spa->spa_root_vdev,
5394 dmu_tx_get_txg(tx), B_FALSE);
5395
5396 spa_config_exit(spa, SCL_STATE, FTAG);
5397
5398 if (spa->spa_config_syncing)
5399 nvlist_free(spa->spa_config_syncing);
5400 spa->spa_config_syncing = config;
5401
5402 spa_sync_nvlist(spa, spa->spa_config_object, config, tx);
5403}
5404
5405/*
5406 * Set zpool properties.
5407 */
5408static void
5409spa_sync_props(void *arg1, void *arg2, dmu_tx_t *tx)
5410{
5411 spa_t *spa = arg1;
5412 objset_t *mos = spa->spa_meta_objset;
5413 nvlist_t *nvp = arg2;
5414 nvpair_t *elem;
5415 uint64_t intval;
5416 char *strval;
5417 zpool_prop_t prop;
5418 const char *propname;
5419 zprop_type_t proptype;
5420
5421 mutex_enter(&spa->spa_props_lock);
5422
5423 elem = NULL;
5424 while ((elem = nvlist_next_nvpair(nvp, elem))) {
5425 switch (prop = zpool_name_to_prop(nvpair_name(elem))) {
5426 case ZPOOL_PROP_VERSION:
5427 /*
5428 * Only set version for non-zpool-creation cases
5429 * (set/import). spa_create() needs special care
5430 * for version setting.
5431 */
5432 if (tx->tx_txg != TXG_INITIAL) {
5433 VERIFY(nvpair_value_uint64(elem,
5434 &intval) == 0);
5435 ASSERT(intval <= SPA_VERSION);
5436 ASSERT(intval >= spa_version(spa));
5437 spa->spa_uberblock.ub_version = intval;
5438 vdev_config_dirty(spa->spa_root_vdev);
5439 }
5440 break;
5441
5442 case ZPOOL_PROP_ALTROOT:
5443 /*
5444 * 'altroot' is a non-persistent property. It should
5445 * have been set temporarily at creation or import time.
5446 */
5447 ASSERT(spa->spa_root != NULL);
5448 break;
5449
5450 case ZPOOL_PROP_READONLY:
5451 case ZPOOL_PROP_CACHEFILE:
5452 /*
5453 * 'readonly' and 'cachefile' are also non-persisitent
5454 * properties.
5455 */
5456 break;
5457 case ZPOOL_PROP_COMMENT:
5458 VERIFY(nvpair_value_string(elem, &strval) == 0);
5459 if (spa->spa_comment != NULL)
5460 spa_strfree(spa->spa_comment);
5461 spa->spa_comment = spa_strdup(strval);
5462 /*
5463 * We need to dirty the configuration on all the vdevs
5464 * so that their labels get updated. It's unnecessary
5465 * to do this for pool creation since the vdev's
5466 * configuratoin has already been dirtied.
5467 */
5468 if (tx->tx_txg != TXG_INITIAL)
5469 vdev_config_dirty(spa->spa_root_vdev);
5470 break;
5471 default:
5472 /*
5473 * Set pool property values in the poolprops mos object.
5474 */
5475 if (spa->spa_pool_props_object == 0) {
5476 VERIFY((spa->spa_pool_props_object =
5477 zap_create(mos, DMU_OT_POOL_PROPS,
5478 DMU_OT_NONE, 0, tx)) > 0);
5479
5480 VERIFY(zap_update(mos,
5481 DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_PROPS,
5482 8, 1, &spa->spa_pool_props_object, tx)
5483 == 0);
5484 }
5485
5486 /* normalize the property name */
5487 propname = zpool_prop_to_name(prop);
5488 proptype = zpool_prop_get_type(prop);
5489
5490 if (nvpair_type(elem) == DATA_TYPE_STRING) {
5491 ASSERT(proptype == PROP_TYPE_STRING);
5492 VERIFY(nvpair_value_string(elem, &strval) == 0);
5493 VERIFY(zap_update(mos,
5494 spa->spa_pool_props_object, propname,
5495 1, strlen(strval) + 1, strval, tx) == 0);
5496
5497 } else if (nvpair_type(elem) == DATA_TYPE_UINT64) {
5498 VERIFY(nvpair_value_uint64(elem, &intval) == 0);
5499
5500 if (proptype == PROP_TYPE_INDEX) {
5501 const char *unused;
5502 VERIFY(zpool_prop_index_to_string(
5503 prop, intval, &unused) == 0);
5504 }
5505 VERIFY(zap_update(mos,
5506 spa->spa_pool_props_object, propname,
5507 8, 1, &intval, tx) == 0);
5508 } else {
5509 ASSERT(0); /* not allowed */
5510 }
5511
5512 switch (prop) {
5513 case ZPOOL_PROP_DELEGATION:
5514 spa->spa_delegation = intval;
5515 break;
5516 case ZPOOL_PROP_BOOTFS:
5517 spa->spa_bootfs = intval;
5518 break;
5519 case ZPOOL_PROP_FAILUREMODE:
5520 spa->spa_failmode = intval;
5521 break;
5522 case ZPOOL_PROP_AUTOEXPAND:
5523 spa->spa_autoexpand = intval;
5524 if (tx->tx_txg != TXG_INITIAL)
5525 spa_async_request(spa,
5526 SPA_ASYNC_AUTOEXPAND);
5527 break;
5528 case ZPOOL_PROP_DEDUPDITTO:
5529 spa->spa_dedup_ditto = intval;
5530 break;
5531 default:
5532 break;
5533 }
5534 }
5535
5536 /* log internal history if this is not a zpool create */
5537 if (spa_version(spa) >= SPA_VERSION_ZPOOL_HISTORY &&
5538 tx->tx_txg != TXG_INITIAL) {
5539 spa_history_log_internal(LOG_POOL_PROPSET,
5540 spa, tx, "%s %lld %s",
5541 nvpair_name(elem), intval, spa_name(spa));
5542 }
5543 }
5544
5545 mutex_exit(&spa->spa_props_lock);
5546}
5547
5548/*
5549 * Perform one-time upgrade on-disk changes. spa_version() does not
5550 * reflect the new version this txg, so there must be no changes this
5551 * txg to anything that the upgrade code depends on after it executes.
5552 * Therefore this must be called after dsl_pool_sync() does the sync
5553 * tasks.
5554 */
5555static void
5556spa_sync_upgrades(spa_t *spa, dmu_tx_t *tx)
5557{
5558 dsl_pool_t *dp = spa->spa_dsl_pool;
5559
5560 ASSERT(spa->spa_sync_pass == 1);
5561
5562 if (spa->spa_ubsync.ub_version < SPA_VERSION_ORIGIN &&
5563 spa->spa_uberblock.ub_version >= SPA_VERSION_ORIGIN) {
5564 dsl_pool_create_origin(dp, tx);
5565
5566 /* Keeping the origin open increases spa_minref */
5567 spa->spa_minref += 3;
5568 }
5569
5570 if (spa->spa_ubsync.ub_version < SPA_VERSION_NEXT_CLONES &&
5571 spa->spa_uberblock.ub_version >= SPA_VERSION_NEXT_CLONES) {
5572 dsl_pool_upgrade_clones(dp, tx);
5573 }
5574
5575 if (spa->spa_ubsync.ub_version < SPA_VERSION_DIR_CLONES &&
5576 spa->spa_uberblock.ub_version >= SPA_VERSION_DIR_CLONES) {
5577 dsl_pool_upgrade_dir_clones(dp, tx);
5578
5579 /* Keeping the freedir open increases spa_minref */
5580 spa->spa_minref += 3;
5581 }
5582}
5583
5584/*
5585 * Sync the specified transaction group. New blocks may be dirtied as
5586 * part of the process, so we iterate until it converges.
5587 */
5588void
5589spa_sync(spa_t *spa, uint64_t txg)
5590{
5591 dsl_pool_t *dp = spa->spa_dsl_pool;
5592 objset_t *mos = spa->spa_meta_objset;
5593 bpobj_t *defer_bpo = &spa->spa_deferred_bpobj;
5594 bplist_t *free_bpl = &spa->spa_free_bplist[txg & TXG_MASK];
5595 vdev_t *rvd = spa->spa_root_vdev;
5596 vdev_t *vd;
5597 dmu_tx_t *tx;
5598 int error;
5599
5600 VERIFY(spa_writeable(spa));
5601
5602 /*
5603 * Lock out configuration changes.
5604 */
5605 spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER);
5606
5607 spa->spa_syncing_txg = txg;
5608 spa->spa_sync_pass = 0;
5609
5610 /*
5611 * If there are any pending vdev state changes, convert them
5612 * into config changes that go out with this transaction group.
5613 */
5614 spa_config_enter(spa, SCL_STATE, FTAG, RW_READER);
5615 while (list_head(&spa->spa_state_dirty_list) != NULL) {
5616 /*
5617 * We need the write lock here because, for aux vdevs,
5618 * calling vdev_config_dirty() modifies sav_config.
5619 * This is ugly and will become unnecessary when we
5620 * eliminate the aux vdev wart by integrating all vdevs
5621 * into the root vdev tree.
5622 */
5623 spa_config_exit(spa, SCL_CONFIG | SCL_STATE, FTAG);
5624 spa_config_enter(spa, SCL_CONFIG | SCL_STATE, FTAG, RW_WRITER);
5625 while ((vd = list_head(&spa->spa_state_dirty_list)) != NULL) {
5626 vdev_state_clean(vd);
5627 vdev_config_dirty(vd);
5628 }
5629 spa_config_exit(spa, SCL_CONFIG | SCL_STATE, FTAG);
5630 spa_config_enter(spa, SCL_CONFIG | SCL_STATE, FTAG, RW_READER);
5631 }
5632 spa_config_exit(spa, SCL_STATE, FTAG);
5633
5634 tx = dmu_tx_create_assigned(dp, txg);
5635
5636 /*
5637 * If we are upgrading to SPA_VERSION_RAIDZ_DEFLATE this txg,
5638 * set spa_deflate if we have no raid-z vdevs.
5639 */
5640 if (spa->spa_ubsync.ub_version < SPA_VERSION_RAIDZ_DEFLATE &&
5641 spa->spa_uberblock.ub_version >= SPA_VERSION_RAIDZ_DEFLATE) {
5642 int i;
5643
5644 for (i = 0; i < rvd->vdev_children; i++) {
5645 vd = rvd->vdev_child[i];
5646 if (vd->vdev_deflate_ratio != SPA_MINBLOCKSIZE)
5647 break;
5648 }
5649 if (i == rvd->vdev_children) {
5650 spa->spa_deflate = TRUE;
5651 VERIFY(0 == zap_add(spa->spa_meta_objset,
5652 DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_DEFLATE,
5653 sizeof (uint64_t), 1, &spa->spa_deflate, tx));
5654 }
5655 }
5656
5657 /*
5658 * If anything has changed in this txg, or if someone is waiting
5659 * for this txg to sync (eg, spa_vdev_remove()), push the
5660 * deferred frees from the previous txg. If not, leave them
5661 * alone so that we don't generate work on an otherwise idle
5662 * system.
5663 */
5664 if (!txg_list_empty(&dp->dp_dirty_datasets, txg) ||
5665 !txg_list_empty(&dp->dp_dirty_dirs, txg) ||
5666 !txg_list_empty(&dp->dp_sync_tasks, txg) ||
5667 ((dsl_scan_active(dp->dp_scan) ||
5668 txg_sync_waiting(dp)) && !spa_shutting_down(spa))) {
5669 zio_t *zio = zio_root(spa, NULL, NULL, 0);
5670 VERIFY3U(bpobj_iterate(defer_bpo,
5671 spa_free_sync_cb, zio, tx), ==, 0);
5672 VERIFY3U(zio_wait(zio), ==, 0);
5673 }
5674
5675 /*
5676 * Iterate to convergence.
5677 */
5678 do {
5679 int pass = ++spa->spa_sync_pass;
5680
5681 spa_sync_config_object(spa, tx);
5682 spa_sync_aux_dev(spa, &spa->spa_spares, tx,
5683 ZPOOL_CONFIG_SPARES, DMU_POOL_SPARES);
5684 spa_sync_aux_dev(spa, &spa->spa_l2cache, tx,
5685 ZPOOL_CONFIG_L2CACHE, DMU_POOL_L2CACHE);
5686 spa_errlog_sync(spa, txg);
5687 dsl_pool_sync(dp, txg);
5688
5689 if (pass <= SYNC_PASS_DEFERRED_FREE) {
5690 zio_t *zio = zio_root(spa, NULL, NULL, 0);
5691 bplist_iterate(free_bpl, spa_free_sync_cb,
5692 zio, tx);
5693 VERIFY(zio_wait(zio) == 0);
5694 } else {
5695 bplist_iterate(free_bpl, bpobj_enqueue_cb,
5696 defer_bpo, tx);
5697 }
5698
5699 ddt_sync(spa, txg);
5700 dsl_scan_sync(dp, tx);
5701
5702 while (vd = txg_list_remove(&spa->spa_vdev_txg_list, txg))
5703 vdev_sync(vd, txg);
5704
5705 if (pass == 1)
5706 spa_sync_upgrades(spa, tx);
5707
5708 } while (dmu_objset_is_dirty(mos, txg));
5709
5710 /*
5711 * Rewrite the vdev configuration (which includes the uberblock)
5712 * to commit the transaction group.
5713 *
5714 * If there are no dirty vdevs, we sync the uberblock to a few
5715 * random top-level vdevs that are known to be visible in the
5716 * config cache (see spa_vdev_add() for a complete description).
5717 * If there *are* dirty vdevs, sync the uberblock to all vdevs.
5718 */
5719 for (;;) {
5720 /*
5721 * We hold SCL_STATE to prevent vdev open/close/etc.
5722 * while we're attempting to write the vdev labels.
5723 */
5724 spa_config_enter(spa, SCL_STATE, FTAG, RW_READER);
5725
5726 if (list_is_empty(&spa->spa_config_dirty_list)) {
5727 vdev_t *svd[SPA_DVAS_PER_BP];
5728 int svdcount = 0;
5729 int children = rvd->vdev_children;
5730 int c0 = spa_get_random(children);
5731
5732 for (int c = 0; c < children; c++) {
5733 vd = rvd->vdev_child[(c0 + c) % children];
5734 if (vd->vdev_ms_array == 0 || vd->vdev_islog)
5735 continue;
5736 svd[svdcount++] = vd;
5737 if (svdcount == SPA_DVAS_PER_BP)
5738 break;
5739 }
5740 error = vdev_config_sync(svd, svdcount, txg, B_FALSE);
5741 if (error != 0)
5742 error = vdev_config_sync(svd, svdcount, txg,
5743 B_TRUE);
5744 } else {
5745 error = vdev_config_sync(rvd->vdev_child,
5746 rvd->vdev_children, txg, B_FALSE);
5747 if (error != 0)
5748 error = vdev_config_sync(rvd->vdev_child,
5749 rvd->vdev_children, txg, B_TRUE);
5750 }
5751
5752 spa_config_exit(spa, SCL_STATE, FTAG);
5753
5754 if (error == 0)
5755 break;
5756 zio_suspend(spa, NULL);
5757 zio_resume_wait(spa);
5758 }
5759 dmu_tx_commit(tx);
5760
5761 /*
5762 * Clear the dirty config list.
5763 */
5764 while ((vd = list_head(&spa->spa_config_dirty_list)) != NULL)
5765 vdev_config_clean(vd);
5766
5767 /*
5768 * Now that the new config has synced transactionally,
5769 * let it become visible to the config cache.
5770 */
5771 if (spa->spa_config_syncing != NULL) {
5772 spa_config_set(spa, spa->spa_config_syncing);
5773 spa->spa_config_txg = txg;
5774 spa->spa_config_syncing = NULL;
5775 }
5776
5777 spa->spa_ubsync = spa->spa_uberblock;
5778
5779 dsl_pool_sync_done(dp, txg);
5780
5781 /*
5782 * Update usable space statistics.
5783 */
5784 while (vd = txg_list_remove(&spa->spa_vdev_txg_list, TXG_CLEAN(txg)))
5785 vdev_sync_done(vd, txg);
5786
5787 spa_update_dspace(spa);
5788
5789 /*
5790 * It had better be the case that we didn't dirty anything
5791 * since vdev_config_sync().
5792 */
5793 ASSERT(txg_list_empty(&dp->dp_dirty_datasets, txg));
5794 ASSERT(txg_list_empty(&dp->dp_dirty_dirs, txg));
5795 ASSERT(txg_list_empty(&spa->spa_vdev_txg_list, txg));
5796
5797 spa->spa_sync_pass = 0;
5798
5799 spa_config_exit(spa, SCL_CONFIG, FTAG);
5800
5801 spa_handle_ignored_writes(spa);
5802
5803 /*
5804 * If any async tasks have been requested, kick them off.
5805 */
5806 spa_async_dispatch(spa);
5807}
5808
5809/*
5810 * Sync all pools. We don't want to hold the namespace lock across these
5811 * operations, so we take a reference on the spa_t and drop the lock during the
5812 * sync.
5813 */
5814void
5815spa_sync_allpools(void)
5816{
5817 spa_t *spa = NULL;
5818 mutex_enter(&spa_namespace_lock);
5819 while ((spa = spa_next(spa)) != NULL) {
5820 if (spa_state(spa) != POOL_STATE_ACTIVE ||
5821 !spa_writeable(spa) || spa_suspended(spa))
5822 continue;
5823 spa_open_ref(spa, FTAG);
5824 mutex_exit(&spa_namespace_lock);
5825 txg_wait_synced(spa_get_dsl(spa), 0);
5826 mutex_enter(&spa_namespace_lock);
5827 spa_close(spa, FTAG);
5828 }
5829 mutex_exit(&spa_namespace_lock);
5830}
5831
5832/*
5833 * ==========================================================================
5834 * Miscellaneous routines
5835 * ==========================================================================
5836 */
5837
5838/*
5839 * Remove all pools in the system.
5840 */
5841void
5842spa_evict_all(void)
5843{
5844 spa_t *spa;
5845
5846 /*
5847 * Remove all cached state. All pools should be closed now,
5848 * so every spa in the AVL tree should be unreferenced.
5849 */
5850 mutex_enter(&spa_namespace_lock);
5851 while ((spa = spa_next(NULL)) != NULL) {
5852 /*
5853 * Stop async tasks. The async thread may need to detach
5854 * a device that's been replaced, which requires grabbing
5855 * spa_namespace_lock, so we must drop it here.
5856 */
5857 spa_open_ref(spa, FTAG);
5858 mutex_exit(&spa_namespace_lock);
5859 spa_async_suspend(spa);
5860 mutex_enter(&spa_namespace_lock);
5861 spa_close(spa, FTAG);
5862
5863 if (spa->spa_state != POOL_STATE_UNINITIALIZED) {
5864 spa_unload(spa);
5865 spa_deactivate(spa);
5866 }
5867 spa_remove(spa);
5868 }
5869 mutex_exit(&spa_namespace_lock);
5870}
5871
5872vdev_t *
5873spa_lookup_by_guid(spa_t *spa, uint64_t guid, boolean_t aux)
5874{
5875 vdev_t *vd;
5876 int i;
5877
5878 if ((vd = vdev_lookup_by_guid(spa->spa_root_vdev, guid)) != NULL)
5879 return (vd);
5880
5881 if (aux) {
5882 for (i = 0; i < spa->spa_l2cache.sav_count; i++) {
5883 vd = spa->spa_l2cache.sav_vdevs[i];
5884 if (vd->vdev_guid == guid)
5885 return (vd);
5886 }
5887
5888 for (i = 0; i < spa->spa_spares.sav_count; i++) {
5889 vd = spa->spa_spares.sav_vdevs[i];
5890 if (vd->vdev_guid == guid)
5891 return (vd);
5892 }
5893 }
5894
5895 return (NULL);
5896}
5897
5898void
5899spa_upgrade(spa_t *spa, uint64_t version)
5900{
5901 ASSERT(spa_writeable(spa));
5902
5903 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
5904
5905 /*
5906 * This should only be called for a non-faulted pool, and since a
5907 * future version would result in an unopenable pool, this shouldn't be
5908 * possible.
5909 */
5910 ASSERT(spa->spa_uberblock.ub_version <= SPA_VERSION);
5911 ASSERT(version >= spa->spa_uberblock.ub_version);
5912
5913 spa->spa_uberblock.ub_version = version;
5914 vdev_config_dirty(spa->spa_root_vdev);
5915
5916 spa_config_exit(spa, SCL_ALL, FTAG);
5917
5918 txg_wait_synced(spa_get_dsl(spa), 0);
5919}
5920
5921boolean_t
5922spa_has_spare(spa_t *spa, uint64_t guid)
5923{
5924 int i;
5925 uint64_t spareguid;
5926 spa_aux_vdev_t *sav = &spa->spa_spares;
5927
5928 for (i = 0; i < sav->sav_count; i++)
5929 if (sav->sav_vdevs[i]->vdev_guid == guid)
5930 return (B_TRUE);
5931
5932 for (i = 0; i < sav->sav_npending; i++) {
5933 if (nvlist_lookup_uint64(sav->sav_pending[i], ZPOOL_CONFIG_GUID,
5934 &spareguid) == 0 && spareguid == guid)
5935 return (B_TRUE);
5936 }
5937
5938 return (B_FALSE);
5939}
5940
5941/*
5942 * Check if a pool has an active shared spare device.
5943 * Note: reference count of an active spare is 2, as a spare and as a replace
5944 */
5945static boolean_t
5946spa_has_active_shared_spare(spa_t *spa)
5947{
5948 int i, refcnt;
5949 uint64_t pool;
5950 spa_aux_vdev_t *sav = &spa->spa_spares;
5951
5952 for (i = 0; i < sav->sav_count; i++) {
5953 if (spa_spare_exists(sav->sav_vdevs[i]->vdev_guid, &pool,
5954 &refcnt) && pool != 0ULL && pool == spa_guid(spa) &&
5955 refcnt > 2)
5956 return (B_TRUE);
5957 }
5958
5959 return (B_FALSE);
5960}
5961
5962/*
5963 * Post a sysevent corresponding to the given event. The 'name' must be one of
5964 * the event definitions in sys/sysevent/eventdefs.h. The payload will be
5965 * filled in from the spa and (optionally) the vdev. This doesn't do anything
5966 * in the userland libzpool, as we don't want consumers to misinterpret ztest
5967 * or zdb as real changes.
5968 */
5969void
5970spa_event_notify(spa_t *spa, vdev_t *vd, const char *name)
5971{
5972#ifdef _KERNEL
5973 sysevent_t *ev;
5974 sysevent_attr_list_t *attr = NULL;
5975 sysevent_value_t value;
5976 sysevent_id_t eid;
5977
5978 ev = sysevent_alloc(EC_ZFS, (char *)name, SUNW_KERN_PUB "zfs",
5979 SE_SLEEP);
5980
5981 value.value_type = SE_DATA_TYPE_STRING;
5982 value.value.sv_string = spa_name(spa);
5983 if (sysevent_add_attr(&attr, ZFS_EV_POOL_NAME, &value, SE_SLEEP) != 0)
5984 goto done;
5985
5986 value.value_type = SE_DATA_TYPE_UINT64;
5987 value.value.sv_uint64 = spa_guid(spa);
5988 if (sysevent_add_attr(&attr, ZFS_EV_POOL_GUID, &value, SE_SLEEP) != 0)
5989 goto done;
5990
5991 if (vd) {
5992 value.value_type = SE_DATA_TYPE_UINT64;
5993 value.value.sv_uint64 = vd->vdev_guid;
5994 if (sysevent_add_attr(&attr, ZFS_EV_VDEV_GUID, &value,
5995 SE_SLEEP) != 0)
5996 goto done;
5997
5998 if (vd->vdev_path) {
5999 value.value_type = SE_DATA_TYPE_STRING;
6000 value.value.sv_string = vd->vdev_path;
6001 if (sysevent_add_attr(&attr, ZFS_EV_VDEV_PATH,
6002 &value, SE_SLEEP) != 0)
6003 goto done;
6004 }
6005 }
6006
6007 if (sysevent_attach_attributes(ev, attr) != 0)
6008 goto done;
6009 attr = NULL;
6010
6011 (void) log_sysevent(ev, SE_SLEEP, &eid);
6012
6013done:
6014 if (attr)
6015 sysevent_free_attr(attr);
6016 sysevent_free(ev);
6017#endif
6018}