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freebsd-nq/module/zfs/spa.c
Matthew Ahrens e8b96c6007 Illumos #4045 write throttle & i/o scheduler performance work 
4045 zfs write throttle & i/o scheduler performance work

1. The ZFS i/o scheduler (vdev_queue.c) now divides i/os into 5 classes: sync
read, sync write, async read, async write, and scrub/resilver.  The scheduler
issues a number of concurrent i/os from each class to the device.  Once a class
has been selected, an i/o is selected from this class using either an elevator
algorithem (async, scrub classes) or FIFO (sync classes).  The number of
concurrent async write i/os is tuned dynamically based on i/o load, to achieve
good sync i/o latency when there is not a high load of writes, and good write
throughput when there is.  See the block comment in vdev_queue.c (reproduced
below) for more details.

2. The write throttle (dsl_pool_tempreserve_space() and
txg_constrain_throughput()) is rewritten to produce much more consistent delays
when under constant load.  The new write throttle is based on the amount of
dirty data, rather than guesses about future performance of the system.  When
there is a lot of dirty data, each transaction (e.g. write() syscall) will be
delayed by the same small amount.  This eliminates the "brick wall of wait"
that the old write throttle could hit, causing all transactions to wait several
seconds until the next txg opens.  One of the keys to the new write throttle is
decrementing the amount of dirty data as i/o completes, rather than at the end
of spa_sync().  Note that the write throttle is only applied once the i/o
scheduler is issuing the maximum number of outstanding async writes.  See the
block comments in dsl_pool.c and above dmu_tx_delay() (reproduced below) for
more details.

This diff has several other effects, including:

 * the commonly-tuned global variable zfs_vdev_max_pending has been removed;
use per-class zfs_vdev_*_max_active values or zfs_vdev_max_active instead.

 * the size of each txg (meaning the amount of dirty data written, and thus the
time it takes to write out) is now controlled differently.  There is no longer
an explicit time goal; the primary determinant is amount of dirty data.
Systems that are under light or medium load will now often see that a txg is
always syncing, but the impact to performance (e.g. read latency) is minimal.
Tune zfs_dirty_data_max and zfs_dirty_data_sync to control this.

 * zio_taskq_batch_pct = 75 -- Only use 75% of all CPUs for compression,
checksum, etc.  This improves latency by not allowing these CPU-intensive tasks
to consume all CPU (on machines with at least 4 CPU's; the percentage is
rounded up).

--matt

APPENDIX: problems with the current i/o scheduler

The current ZFS i/o scheduler (vdev_queue.c) is deadline based.  The problem
with this is that if there are always i/os pending, then certain classes of
i/os can see very long delays.

For example, if there are always synchronous reads outstanding, then no async
writes will be serviced until they become "past due".  One symptom of this
situation is that each pass of the txg sync takes at least several seconds
(typically 3 seconds).

If many i/os become "past due" (their deadline is in the past), then we must
service all of these overdue i/os before any new i/os.  This happens when we
enqueue a batch of async writes for the txg sync, with deadlines 2.5 seconds in
the future.  If we can't complete all the i/os in 2.5 seconds (e.g. because
there were always reads pending), then these i/os will become past due.  Now we
must service all the "async" writes (which could be hundreds of megabytes)
before we service any reads, introducing considerable latency to synchronous
i/os (reads or ZIL writes).

Notes on porting to ZFS on Linux:

- zio_t gained new members io_physdone and io_phys_children.  Because
  object caches in the Linux port call the constructor only once at
  allocation time, objects may contain residual data when retrieved
  from the cache. Therefore zio_create() was updated to zero out the two
  new fields.

- vdev_mirror_pending() relied on the depth of the per-vdev pending queue
  (vq->vq_pending_tree) to select the least-busy leaf vdev to read from.
  This tree has been replaced by vq->vq_active_tree which is now used
  for the same purpose.

- vdev_queue_init() used the value of zfs_vdev_max_pending to determine
  the number of vdev I/O buffers to pre-allocate.  That global no longer
  exists, so we instead use the sum of the *_max_active values for each of
  the five I/O classes described above.

- The Illumos implementation of dmu_tx_delay() delays a transaction by
  sleeping in condition variable embedded in the thread
  (curthread->t_delay_cv).  We do not have an equivalent CV to use in
  Linux, so this change replaced the delay logic with a wrapper called
  zfs_sleep_until(). This wrapper could be adopted upstream and in other
  downstream ports to abstract away operating system-specific delay logic.

- These tunables are added as module parameters, and descriptions added
  to the zfs-module-parameters.5 man page.

  spa_asize_inflation
  zfs_deadman_synctime_ms
  zfs_vdev_max_active
  zfs_vdev_async_write_active_min_dirty_percent
  zfs_vdev_async_write_active_max_dirty_percent
  zfs_vdev_async_read_max_active
  zfs_vdev_async_read_min_active
  zfs_vdev_async_write_max_active
  zfs_vdev_async_write_min_active
  zfs_vdev_scrub_max_active
  zfs_vdev_scrub_min_active
  zfs_vdev_sync_read_max_active
  zfs_vdev_sync_read_min_active
  zfs_vdev_sync_write_max_active
  zfs_vdev_sync_write_min_active
  zfs_dirty_data_max_percent
  zfs_delay_min_dirty_percent
  zfs_dirty_data_max_max_percent
  zfs_dirty_data_max
  zfs_dirty_data_max_max
  zfs_dirty_data_sync
  zfs_delay_scale

  The latter four have type unsigned long, whereas they are uint64_t in
  Illumos.  This accommodates Linux's module_param() supported types, but
  means they may overflow on 32-bit architectures.

  The values zfs_dirty_data_max and zfs_dirty_data_max_max are the most
  likely to overflow on 32-bit systems, since they express physical RAM
  sizes in bytes.  In fact, Illumos initializes zfs_dirty_data_max_max to
  2^32 which does overflow. To resolve that, this port instead initializes
  it in arc_init() to 25% of physical RAM, and adds the tunable
  zfs_dirty_data_max_max_percent to override that percentage.  While this
  solution doesn't completely avoid the overflow issue, it should be a
  reasonable default for most systems, and the minority of affected
  systems can work around the issue by overriding the defaults.

- Fixed reversed logic in comment above zfs_delay_scale declaration.

- Clarified comments in vdev_queue.c regarding when per-queue minimums take
  effect.

- Replaced dmu_tx_write_limit in the dmu_tx kstat file
  with dmu_tx_dirty_delay and dmu_tx_dirty_over_max.  The first counts
  how many times a transaction has been delayed because the pool dirty
  data has exceeded zfs_delay_min_dirty_percent.  The latter counts how
  many times the pool dirty data has exceeded zfs_dirty_data_max (which
  we expect to never happen).

- The original patch would have regressed the bug fixed in
  zfsonlinux/zfs@c418410, which prevented users from setting the
  zfs_vdev_aggregation_limit tuning larger than SPA_MAXBLOCKSIZE.
  A similar fix is added to vdev_queue_aggregate().

- In vdev_queue_io_to_issue(), dynamically allocate 'zio_t search' on the
  heap instead of the stack.  In Linux we can't afford such large
  structures on the stack.

Reviewed by: George Wilson <george.wilson@delphix.com>
Reviewed by: Adam Leventhal <ahl@delphix.com>
Reviewed by: Christopher Siden <christopher.siden@delphix.com>
Reviewed by: Ned Bass <bass6@llnl.gov>
Reviewed by: Brendan Gregg <brendan.gregg@joyent.com>
Approved by: Robert Mustacchi <rm@joyent.com>

References:
  http://www.illumos.org/issues/4045
  illumos/illumos-gate@69962b5647

Ported-by: Ned Bass <bass6@llnl.gov>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #1913
2013-12-06 09:32:43 -08:00

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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2013 by Delphix. All rights reserved.
* Copyright 2013 Nexenta Systems, Inc. All rights reserved.
*/
/*
* SPA: Storage Pool Allocator
*
* This file contains all the routines used when modifying on-disk SPA state.
* This includes opening, importing, destroying, exporting a pool, and syncing a
* pool.
*/
#include <sys/zfs_context.h>
#include <sys/fm/fs/zfs.h>
#include <sys/spa_impl.h>
#include <sys/zio.h>
#include <sys/zio_checksum.h>
#include <sys/dmu.h>
#include <sys/dmu_tx.h>
#include <sys/zap.h>
#include <sys/zil.h>
#include <sys/ddt.h>
#include <sys/vdev_impl.h>
#include <sys/vdev_disk.h>
#include <sys/metaslab.h>
#include <sys/metaslab_impl.h>
#include <sys/uberblock_impl.h>
#include <sys/txg.h>
#include <sys/avl.h>
#include <sys/dmu_traverse.h>
#include <sys/dmu_objset.h>
#include <sys/unique.h>
#include <sys/dsl_pool.h>
#include <sys/dsl_dataset.h>
#include <sys/dsl_dir.h>
#include <sys/dsl_prop.h>
#include <sys/dsl_synctask.h>
#include <sys/fs/zfs.h>
#include <sys/arc.h>
#include <sys/callb.h>
#include <sys/systeminfo.h>
#include <sys/spa_boot.h>
#include <sys/zfs_ioctl.h>
#include <sys/dsl_scan.h>
#include <sys/zfeature.h>
#include <sys/dsl_destroy.h>
#include <sys/zvol.h>
#ifdef _KERNEL
#include <sys/bootprops.h>
#include <sys/callb.h>
#include <sys/cpupart.h>
#include <sys/pool.h>
#include <sys/sysdc.h>
#include <sys/zone.h>
#endif /* _KERNEL */
#include "zfs_prop.h"
#include "zfs_comutil.h"
typedef enum zti_modes {
ZTI_MODE_FIXED, /* value is # of threads (min 1) */
ZTI_MODE_BATCH, /* cpu-intensive; value is ignored */
ZTI_MODE_NULL, /* don't create a taskq */
ZTI_NMODES
} zti_modes_t;
#define ZTI_P(n, q) { ZTI_MODE_FIXED, (n), (q) }
#define ZTI_PCT(n) { ZTI_MODE_ONLINE_PERCENT, (n), 1 }
#define ZTI_BATCH { ZTI_MODE_BATCH, 0, 1 }
#define ZTI_NULL { ZTI_MODE_NULL, 0, 0 }
#define ZTI_N(n) ZTI_P(n, 1)
#define ZTI_ONE ZTI_N(1)
typedef struct zio_taskq_info {
zti_modes_t zti_mode;
uint_t zti_value;
uint_t zti_count;
} zio_taskq_info_t;
static const char *const zio_taskq_types[ZIO_TASKQ_TYPES] = {
"iss", "iss_h", "int", "int_h"
};
/*
* This table defines the taskq settings for each ZFS I/O type. When
* initializing a pool, we use this table to create an appropriately sized
* taskq. Some operations are low volume and therefore have a small, static
* number of threads assigned to their taskqs using the ZTI_N(#) or ZTI_ONE
* macros. Other operations process a large amount of data; the ZTI_BATCH
* macro causes us to create a taskq oriented for throughput. Some operations
* are so high frequency and short-lived that the taskq itself can become a a
* point of lock contention. The ZTI_P(#, #) macro indicates that we need an
* additional degree of parallelism specified by the number of threads per-
* taskq and the number of taskqs; when dispatching an event in this case, the
* particular taskq is chosen at random.
*
* The different taskq priorities are to handle the different contexts (issue
* and interrupt) and then to reserve threads for ZIO_PRIORITY_NOW I/Os that
* need to be handled with minimum delay.
*/
const zio_taskq_info_t zio_taskqs[ZIO_TYPES][ZIO_TASKQ_TYPES] = {
/* ISSUE ISSUE_HIGH INTR INTR_HIGH */
{ ZTI_ONE, ZTI_NULL, ZTI_ONE, ZTI_NULL }, /* NULL */
{ ZTI_N(8), ZTI_NULL, ZTI_BATCH, ZTI_NULL }, /* READ */
{ ZTI_BATCH, ZTI_N(5), ZTI_N(16), ZTI_N(5) }, /* WRITE */
{ ZTI_P(4, 8), ZTI_NULL, ZTI_ONE, ZTI_NULL }, /* FREE */
{ ZTI_ONE, ZTI_NULL, ZTI_ONE, ZTI_NULL }, /* CLAIM */
{ ZTI_ONE, ZTI_NULL, ZTI_ONE, ZTI_NULL }, /* IOCTL */
};
static void spa_sync_version(void *arg, dmu_tx_t *tx);
static void spa_sync_props(void *arg, dmu_tx_t *tx);
static boolean_t spa_has_active_shared_spare(spa_t *spa);
static inline int spa_load_impl(spa_t *spa, uint64_t, nvlist_t *config,
spa_load_state_t state, spa_import_type_t type, boolean_t mosconfig,
char **ereport);
static void spa_vdev_resilver_done(spa_t *spa);
uint_t zio_taskq_batch_pct = 75; /* 1 thread per cpu in pset */
id_t zio_taskq_psrset_bind = PS_NONE;
boolean_t zio_taskq_sysdc = B_TRUE; /* use SDC scheduling class */
uint_t zio_taskq_basedc = 80; /* base duty cycle */
boolean_t spa_create_process = B_TRUE; /* no process ==> no sysdc */
/*
* This (illegal) pool name is used when temporarily importing a spa_t in order
* to get the vdev stats associated with the imported devices.
*/
#define TRYIMPORT_NAME "$import"
/*
* ==========================================================================
* SPA properties routines
* ==========================================================================
*/
/*
* Add a (source=src, propname=propval) list to an nvlist.
*/
static void
spa_prop_add_list(nvlist_t *nvl, zpool_prop_t prop, char *strval,
uint64_t intval, zprop_source_t src)
{
const char *propname = zpool_prop_to_name(prop);
nvlist_t *propval;
VERIFY(nvlist_alloc(&propval, NV_UNIQUE_NAME, KM_PUSHPAGE) == 0);
VERIFY(nvlist_add_uint64(propval, ZPROP_SOURCE, src) == 0);
if (strval != NULL)
VERIFY(nvlist_add_string(propval, ZPROP_VALUE, strval) == 0);
else
VERIFY(nvlist_add_uint64(propval, ZPROP_VALUE, intval) == 0);
VERIFY(nvlist_add_nvlist(nvl, propname, propval) == 0);
nvlist_free(propval);
}
/*
* Get property values from the spa configuration.
*/
static void
spa_prop_get_config(spa_t *spa, nvlist_t **nvp)
{
vdev_t *rvd = spa->spa_root_vdev;
dsl_pool_t *pool = spa->spa_dsl_pool;
uint64_t size;
uint64_t alloc;
uint64_t space;
uint64_t cap, version;
zprop_source_t src = ZPROP_SRC_NONE;
spa_config_dirent_t *dp;
int c;
ASSERT(MUTEX_HELD(&spa->spa_props_lock));
if (rvd != NULL) {
alloc = metaslab_class_get_alloc(spa_normal_class(spa));
size = metaslab_class_get_space(spa_normal_class(spa));
spa_prop_add_list(*nvp, ZPOOL_PROP_NAME, spa_name(spa), 0, src);
spa_prop_add_list(*nvp, ZPOOL_PROP_SIZE, NULL, size, src);
spa_prop_add_list(*nvp, ZPOOL_PROP_ALLOCATED, NULL, alloc, src);
spa_prop_add_list(*nvp, ZPOOL_PROP_FREE, NULL,
size - alloc, src);
space = 0;
for (c = 0; c < rvd->vdev_children; c++) {
vdev_t *tvd = rvd->vdev_child[c];
space += tvd->vdev_max_asize - tvd->vdev_asize;
}
spa_prop_add_list(*nvp, ZPOOL_PROP_EXPANDSZ, NULL, space,
src);
spa_prop_add_list(*nvp, ZPOOL_PROP_READONLY, NULL,
(spa_mode(spa) == FREAD), src);
cap = (size == 0) ? 0 : (alloc * 100 / size);
spa_prop_add_list(*nvp, ZPOOL_PROP_CAPACITY, NULL, cap, src);
spa_prop_add_list(*nvp, ZPOOL_PROP_DEDUPRATIO, NULL,
ddt_get_pool_dedup_ratio(spa), src);
spa_prop_add_list(*nvp, ZPOOL_PROP_HEALTH, NULL,
rvd->vdev_state, src);
version = spa_version(spa);
if (version == zpool_prop_default_numeric(ZPOOL_PROP_VERSION))
src = ZPROP_SRC_DEFAULT;
else
src = ZPROP_SRC_LOCAL;
spa_prop_add_list(*nvp, ZPOOL_PROP_VERSION, NULL, version, src);
}
if (pool != NULL) {
dsl_dir_t *freedir = pool->dp_free_dir;
/*
* The $FREE directory was introduced in SPA_VERSION_DEADLISTS,
* when opening pools before this version freedir will be NULL.
*/
if (freedir != NULL) {
spa_prop_add_list(*nvp, ZPOOL_PROP_FREEING, NULL,
freedir->dd_phys->dd_used_bytes, src);
} else {
spa_prop_add_list(*nvp, ZPOOL_PROP_FREEING,
NULL, 0, src);
}
}
spa_prop_add_list(*nvp, ZPOOL_PROP_GUID, NULL, spa_guid(spa), src);
if (spa->spa_comment != NULL) {
spa_prop_add_list(*nvp, ZPOOL_PROP_COMMENT, spa->spa_comment,
0, ZPROP_SRC_LOCAL);
}
if (spa->spa_root != NULL)
spa_prop_add_list(*nvp, ZPOOL_PROP_ALTROOT, spa->spa_root,
0, ZPROP_SRC_LOCAL);
if ((dp = list_head(&spa->spa_config_list)) != NULL) {
if (dp->scd_path == NULL) {
spa_prop_add_list(*nvp, ZPOOL_PROP_CACHEFILE,
"none", 0, ZPROP_SRC_LOCAL);
} else if (strcmp(dp->scd_path, spa_config_path) != 0) {
spa_prop_add_list(*nvp, ZPOOL_PROP_CACHEFILE,
dp->scd_path, 0, ZPROP_SRC_LOCAL);
}
}
}
/*
* Get zpool property values.
*/
int
spa_prop_get(spa_t *spa, nvlist_t **nvp)
{
objset_t *mos = spa->spa_meta_objset;
zap_cursor_t zc;
zap_attribute_t za;
int err;
err = nvlist_alloc(nvp, NV_UNIQUE_NAME, KM_PUSHPAGE);
if (err)
return err;
mutex_enter(&spa->spa_props_lock);
/*
* Get properties from the spa config.
*/
spa_prop_get_config(spa, nvp);
/* If no pool property object, no more prop to get. */
if (mos == NULL || spa->spa_pool_props_object == 0) {
mutex_exit(&spa->spa_props_lock);
goto out;
}
/*
* Get properties from the MOS pool property object.
*/
for (zap_cursor_init(&zc, mos, spa->spa_pool_props_object);
(err = zap_cursor_retrieve(&zc, &za)) == 0;
zap_cursor_advance(&zc)) {
uint64_t intval = 0;
char *strval = NULL;
zprop_source_t src = ZPROP_SRC_DEFAULT;
zpool_prop_t prop;
if ((prop = zpool_name_to_prop(za.za_name)) == ZPROP_INVAL)
continue;
switch (za.za_integer_length) {
case 8:
/* integer property */
if (za.za_first_integer !=
zpool_prop_default_numeric(prop))
src = ZPROP_SRC_LOCAL;
if (prop == ZPOOL_PROP_BOOTFS) {
dsl_pool_t *dp;
dsl_dataset_t *ds = NULL;
dp = spa_get_dsl(spa);
dsl_pool_config_enter(dp, FTAG);
if ((err = dsl_dataset_hold_obj(dp,
za.za_first_integer, FTAG, &ds))) {
dsl_pool_config_exit(dp, FTAG);
break;
}
strval = kmem_alloc(
MAXNAMELEN + strlen(MOS_DIR_NAME) + 1,
KM_PUSHPAGE);
dsl_dataset_name(ds, strval);
dsl_dataset_rele(ds, FTAG);
dsl_pool_config_exit(dp, FTAG);
} else {
strval = NULL;
intval = za.za_first_integer;
}
spa_prop_add_list(*nvp, prop, strval, intval, src);
if (strval != NULL)
kmem_free(strval,
MAXNAMELEN + strlen(MOS_DIR_NAME) + 1);
break;
case 1:
/* string property */
strval = kmem_alloc(za.za_num_integers, KM_PUSHPAGE);
err = zap_lookup(mos, spa->spa_pool_props_object,
za.za_name, 1, za.za_num_integers, strval);
if (err) {
kmem_free(strval, za.za_num_integers);
break;
}
spa_prop_add_list(*nvp, prop, strval, 0, src);
kmem_free(strval, za.za_num_integers);
break;
default:
break;
}
}
zap_cursor_fini(&zc);
mutex_exit(&spa->spa_props_lock);
out:
if (err && err != ENOENT) {
nvlist_free(*nvp);
*nvp = NULL;
return (err);
}
return (0);
}
/*
* Validate the given pool properties nvlist and modify the list
* for the property values to be set.
*/
static int
spa_prop_validate(spa_t *spa, nvlist_t *props)
{
nvpair_t *elem;
int error = 0, reset_bootfs = 0;
uint64_t objnum = 0;
boolean_t has_feature = B_FALSE;
elem = NULL;
while ((elem = nvlist_next_nvpair(props, elem)) != NULL) {
uint64_t intval;
char *strval, *slash, *check, *fname;
const char *propname = nvpair_name(elem);
zpool_prop_t prop = zpool_name_to_prop(propname);
switch ((int)prop) {
case ZPROP_INVAL:
if (!zpool_prop_feature(propname)) {
error = SET_ERROR(EINVAL);
break;
}
/*
* Sanitize the input.
*/
if (nvpair_type(elem) != DATA_TYPE_UINT64) {
error = SET_ERROR(EINVAL);
break;
}
if (nvpair_value_uint64(elem, &intval) != 0) {
error = SET_ERROR(EINVAL);
break;
}
if (intval != 0) {
error = SET_ERROR(EINVAL);
break;
}
fname = strchr(propname, '@') + 1;
if (zfeature_lookup_name(fname, NULL) != 0) {
error = SET_ERROR(EINVAL);
break;
}
has_feature = B_TRUE;
break;
case ZPOOL_PROP_VERSION:
error = nvpair_value_uint64(elem, &intval);
if (!error &&
(intval < spa_version(spa) ||
intval > SPA_VERSION_BEFORE_FEATURES ||
has_feature))
error = SET_ERROR(EINVAL);
break;
case ZPOOL_PROP_DELEGATION:
case ZPOOL_PROP_AUTOREPLACE:
case ZPOOL_PROP_LISTSNAPS:
case ZPOOL_PROP_AUTOEXPAND:
error = nvpair_value_uint64(elem, &intval);
if (!error && intval > 1)
error = SET_ERROR(EINVAL);
break;
case ZPOOL_PROP_BOOTFS:
/*
* If the pool version is less than SPA_VERSION_BOOTFS,
* or the pool is still being created (version == 0),
* the bootfs property cannot be set.
*/
if (spa_version(spa) < SPA_VERSION_BOOTFS) {
error = SET_ERROR(ENOTSUP);
break;
}
/*
* Make sure the vdev config is bootable
*/
if (!vdev_is_bootable(spa->spa_root_vdev)) {
error = SET_ERROR(ENOTSUP);
break;
}
reset_bootfs = 1;
error = nvpair_value_string(elem, &strval);
if (!error) {
objset_t *os;
uint64_t compress;
if (strval == NULL || strval[0] == '\0') {
objnum = zpool_prop_default_numeric(
ZPOOL_PROP_BOOTFS);
break;
}
if ((error = dmu_objset_hold(strval,FTAG,&os)))
break;
/* Must be ZPL and not gzip compressed. */
if (dmu_objset_type(os) != DMU_OST_ZFS) {
error = SET_ERROR(ENOTSUP);
} else if ((error =
dsl_prop_get_int_ds(dmu_objset_ds(os),
zfs_prop_to_name(ZFS_PROP_COMPRESSION),
&compress)) == 0 &&
!BOOTFS_COMPRESS_VALID(compress)) {
error = SET_ERROR(ENOTSUP);
} else {
objnum = dmu_objset_id(os);
}
dmu_objset_rele(os, FTAG);
}
break;
case ZPOOL_PROP_FAILUREMODE:
error = nvpair_value_uint64(elem, &intval);
if (!error && (intval < ZIO_FAILURE_MODE_WAIT ||
intval > ZIO_FAILURE_MODE_PANIC))
error = SET_ERROR(EINVAL);
/*
* This is a special case which only occurs when
* the pool has completely failed. This allows
* the user to change the in-core failmode property
* without syncing it out to disk (I/Os might
* currently be blocked). We do this by returning
* EIO to the caller (spa_prop_set) to trick it
* into thinking we encountered a property validation
* error.
*/
if (!error && spa_suspended(spa)) {
spa->spa_failmode = intval;
error = SET_ERROR(EIO);
}
break;
case ZPOOL_PROP_CACHEFILE:
if ((error = nvpair_value_string(elem, &strval)) != 0)
break;
if (strval[0] == '\0')
break;
if (strcmp(strval, "none") == 0)
break;
if (strval[0] != '/') {
error = SET_ERROR(EINVAL);
break;
}
slash = strrchr(strval, '/');
ASSERT(slash != NULL);
if (slash[1] == '\0' || strcmp(slash, "/.") == 0 ||
strcmp(slash, "/..") == 0)
error = SET_ERROR(EINVAL);
break;
case ZPOOL_PROP_COMMENT:
if ((error = nvpair_value_string(elem, &strval)) != 0)
break;
for (check = strval; *check != '\0'; check++) {
if (!isprint(*check)) {
error = SET_ERROR(EINVAL);
break;
}
check++;
}
if (strlen(strval) > ZPROP_MAX_COMMENT)
error = SET_ERROR(E2BIG);
break;
case ZPOOL_PROP_DEDUPDITTO:
if (spa_version(spa) < SPA_VERSION_DEDUP)
error = SET_ERROR(ENOTSUP);
else
error = nvpair_value_uint64(elem, &intval);
if (error == 0 &&
intval != 0 && intval < ZIO_DEDUPDITTO_MIN)
error = SET_ERROR(EINVAL);
break;
default:
break;
}
if (error)
break;
}
if (!error && reset_bootfs) {
error = nvlist_remove(props,
zpool_prop_to_name(ZPOOL_PROP_BOOTFS), DATA_TYPE_STRING);
if (!error) {
error = nvlist_add_uint64(props,
zpool_prop_to_name(ZPOOL_PROP_BOOTFS), objnum);
}
}
return (error);
}
void
spa_configfile_set(spa_t *spa, nvlist_t *nvp, boolean_t need_sync)
{
char *cachefile;
spa_config_dirent_t *dp;
if (nvlist_lookup_string(nvp, zpool_prop_to_name(ZPOOL_PROP_CACHEFILE),
&cachefile) != 0)
return;
dp = kmem_alloc(sizeof (spa_config_dirent_t),
KM_PUSHPAGE);
if (cachefile[0] == '\0')
dp->scd_path = spa_strdup(spa_config_path);
else if (strcmp(cachefile, "none") == 0)
dp->scd_path = NULL;
else
dp->scd_path = spa_strdup(cachefile);
list_insert_head(&spa->spa_config_list, dp);
if (need_sync)
spa_async_request(spa, SPA_ASYNC_CONFIG_UPDATE);
}
int
spa_prop_set(spa_t *spa, nvlist_t *nvp)
{
int error;
nvpair_t *elem = NULL;
boolean_t need_sync = B_FALSE;
if ((error = spa_prop_validate(spa, nvp)) != 0)
return (error);
while ((elem = nvlist_next_nvpair(nvp, elem)) != NULL) {
zpool_prop_t prop = zpool_name_to_prop(nvpair_name(elem));
if (prop == ZPOOL_PROP_CACHEFILE ||
prop == ZPOOL_PROP_ALTROOT ||
prop == ZPOOL_PROP_READONLY)
continue;
if (prop == ZPOOL_PROP_VERSION || prop == ZPROP_INVAL) {
uint64_t ver;
if (prop == ZPOOL_PROP_VERSION) {
VERIFY(nvpair_value_uint64(elem, &ver) == 0);
} else {
ASSERT(zpool_prop_feature(nvpair_name(elem)));
ver = SPA_VERSION_FEATURES;
need_sync = B_TRUE;
}
/* Save time if the version is already set. */
if (ver == spa_version(spa))
continue;
/*
* In addition to the pool directory object, we might
* create the pool properties object, the features for
* read object, the features for write object, or the
* feature descriptions object.
*/
error = dsl_sync_task(spa->spa_name, NULL,
spa_sync_version, &ver, 6);
if (error)
return (error);
continue;
}
need_sync = B_TRUE;
break;
}
if (need_sync) {
return (dsl_sync_task(spa->spa_name, NULL, spa_sync_props,
nvp, 6));
}
return (0);
}
/*
* If the bootfs property value is dsobj, clear it.
*/
void
spa_prop_clear_bootfs(spa_t *spa, uint64_t dsobj, dmu_tx_t *tx)
{
if (spa->spa_bootfs == dsobj && spa->spa_pool_props_object != 0) {
VERIFY(zap_remove(spa->spa_meta_objset,
spa->spa_pool_props_object,
zpool_prop_to_name(ZPOOL_PROP_BOOTFS), tx) == 0);
spa->spa_bootfs = 0;
}
}
/*ARGSUSED*/
static int
spa_change_guid_check(void *arg, dmu_tx_t *tx)
{
spa_t *spa = dmu_tx_pool(tx)->dp_spa;
vdev_t *rvd = spa->spa_root_vdev;
uint64_t vdev_state;
ASSERTV(uint64_t *newguid = arg);
spa_config_enter(spa, SCL_STATE, FTAG, RW_READER);
vdev_state = rvd->vdev_state;
spa_config_exit(spa, SCL_STATE, FTAG);
if (vdev_state != VDEV_STATE_HEALTHY)
return (SET_ERROR(ENXIO));
ASSERT3U(spa_guid(spa), !=, *newguid);
return (0);
}
static void
spa_change_guid_sync(void *arg, dmu_tx_t *tx)
{
uint64_t *newguid = arg;
spa_t *spa = dmu_tx_pool(tx)->dp_spa;
uint64_t oldguid;
vdev_t *rvd = spa->spa_root_vdev;
oldguid = spa_guid(spa);
spa_config_enter(spa, SCL_STATE, FTAG, RW_READER);
rvd->vdev_guid = *newguid;
rvd->vdev_guid_sum += (*newguid - oldguid);
vdev_config_dirty(rvd);
spa_config_exit(spa, SCL_STATE, FTAG);
spa_history_log_internal(spa, "guid change", tx, "old=%llu new=%llu",
oldguid, *newguid);
}
/*
* Change the GUID for the pool. This is done so that we can later
* re-import a pool built from a clone of our own vdevs. We will modify
* the root vdev's guid, our own pool guid, and then mark all of our
* vdevs dirty. Note that we must make sure that all our vdevs are
* online when we do this, or else any vdevs that weren't present
* would be orphaned from our pool. We are also going to issue a
* sysevent to update any watchers.
*/
int
spa_change_guid(spa_t *spa)
{
int error;
uint64_t guid;
mutex_enter(&spa->spa_vdev_top_lock);
mutex_enter(&spa_namespace_lock);
guid = spa_generate_guid(NULL);
error = dsl_sync_task(spa->spa_name, spa_change_guid_check,
spa_change_guid_sync, &guid, 5);
if (error == 0) {
spa_config_sync(spa, B_FALSE, B_TRUE);
spa_event_notify(spa, NULL, FM_EREPORT_ZFS_POOL_REGUID);
}
mutex_exit(&spa_namespace_lock);
mutex_exit(&spa->spa_vdev_top_lock);
return (error);
}
/*
* ==========================================================================
* SPA state manipulation (open/create/destroy/import/export)
* ==========================================================================
*/
static int
spa_error_entry_compare(const void *a, const void *b)
{
spa_error_entry_t *sa = (spa_error_entry_t *)a;
spa_error_entry_t *sb = (spa_error_entry_t *)b;
int ret;
ret = bcmp(&sa->se_bookmark, &sb->se_bookmark,
sizeof (zbookmark_t));
if (ret < 0)
return (-1);
else if (ret > 0)
return (1);
else
return (0);
}
/*
* Utility function which retrieves copies of the current logs and
* re-initializes them in the process.
*/
void
spa_get_errlists(spa_t *spa, avl_tree_t *last, avl_tree_t *scrub)
{
ASSERT(MUTEX_HELD(&spa->spa_errlist_lock));
bcopy(&spa->spa_errlist_last, last, sizeof (avl_tree_t));
bcopy(&spa->spa_errlist_scrub, scrub, sizeof (avl_tree_t));
avl_create(&spa->spa_errlist_scrub,
spa_error_entry_compare, sizeof (spa_error_entry_t),
offsetof(spa_error_entry_t, se_avl));
avl_create(&spa->spa_errlist_last,
spa_error_entry_compare, sizeof (spa_error_entry_t),
offsetof(spa_error_entry_t, se_avl));
}
static void
spa_taskqs_init(spa_t *spa, zio_type_t t, zio_taskq_type_t q)
{
const zio_taskq_info_t *ztip = &zio_taskqs[t][q];
enum zti_modes mode = ztip->zti_mode;
uint_t value = ztip->zti_value;
uint_t count = ztip->zti_count;
spa_taskqs_t *tqs = &spa->spa_zio_taskq[t][q];
char name[32];
uint_t i, flags = 0;
boolean_t batch = B_FALSE;
if (mode == ZTI_MODE_NULL) {
tqs->stqs_count = 0;
tqs->stqs_taskq = NULL;
return;
}
ASSERT3U(count, >, 0);
tqs->stqs_count = count;
tqs->stqs_taskq = kmem_alloc(count * sizeof (taskq_t *), KM_SLEEP);
switch (mode) {
case ZTI_MODE_FIXED:
ASSERT3U(value, >=, 1);
value = MAX(value, 1);
break;
case ZTI_MODE_BATCH:
batch = B_TRUE;
flags |= TASKQ_THREADS_CPU_PCT;
value = zio_taskq_batch_pct;
break;
default:
panic("unrecognized mode for %s_%s taskq (%u:%u) in "
"spa_activate()",
zio_type_name[t], zio_taskq_types[q], mode, value);
break;
}
for (i = 0; i < count; i++) {
taskq_t *tq;
if (count > 1) {
(void) snprintf(name, sizeof (name), "%s_%s_%u",
zio_type_name[t], zio_taskq_types[q], i);
} else {
(void) snprintf(name, sizeof (name), "%s_%s",
zio_type_name[t], zio_taskq_types[q]);
}
if (zio_taskq_sysdc && spa->spa_proc != &p0) {
if (batch)
flags |= TASKQ_DC_BATCH;
tq = taskq_create_sysdc(name, value, 50, INT_MAX,
spa->spa_proc, zio_taskq_basedc, flags);
} else {
pri_t pri = maxclsyspri;
/*
* The write issue taskq can be extremely CPU
* intensive. Run it at slightly lower priority
* than the other taskqs.
*/
if (t == ZIO_TYPE_WRITE && q == ZIO_TASKQ_ISSUE)
pri--;
tq = taskq_create_proc(name, value, pri, 50,
INT_MAX, spa->spa_proc, flags);
}
tqs->stqs_taskq[i] = tq;
}
}
static void
spa_taskqs_fini(spa_t *spa, zio_type_t t, zio_taskq_type_t q)
{
spa_taskqs_t *tqs = &spa->spa_zio_taskq[t][q];
uint_t i;
if (tqs->stqs_taskq == NULL) {
ASSERT3U(tqs->stqs_count, ==, 0);
return;
}
for (i = 0; i < tqs->stqs_count; i++) {
ASSERT3P(tqs->stqs_taskq[i], !=, NULL);
taskq_destroy(tqs->stqs_taskq[i]);
}
kmem_free(tqs->stqs_taskq, tqs->stqs_count * sizeof (taskq_t *));
tqs->stqs_taskq = NULL;
}
/*
* Dispatch a task to the appropriate taskq for the ZFS I/O type and priority.
* Note that a type may have multiple discrete taskqs to avoid lock contention
* on the taskq itself. In that case we choose which taskq at random by using
* the low bits of gethrtime().
*/
void
spa_taskq_dispatch_ent(spa_t *spa, zio_type_t t, zio_taskq_type_t q,
task_func_t *func, void *arg, uint_t flags, taskq_ent_t *ent)
{
spa_taskqs_t *tqs = &spa->spa_zio_taskq[t][q];
taskq_t *tq;
ASSERT3P(tqs->stqs_taskq, !=, NULL);
ASSERT3U(tqs->stqs_count, !=, 0);
if (tqs->stqs_count == 1) {
tq = tqs->stqs_taskq[0];
} else {
tq = tqs->stqs_taskq[((uint64_t)gethrtime()) % tqs->stqs_count];
}
taskq_dispatch_ent(tq, func, arg, flags, ent);
}
/*
* Same as spa_taskq_dispatch_ent() but block on the task until completion.
*/
void
spa_taskq_dispatch_sync(spa_t *spa, zio_type_t t, zio_taskq_type_t q,
task_func_t *func, void *arg, uint_t flags)
{
spa_taskqs_t *tqs = &spa->spa_zio_taskq[t][q];
taskq_t *tq;
taskqid_t id;
ASSERT3P(tqs->stqs_taskq, !=, NULL);
ASSERT3U(tqs->stqs_count, !=, 0);
if (tqs->stqs_count == 1) {
tq = tqs->stqs_taskq[0];
} else {
tq = tqs->stqs_taskq[((uint64_t)gethrtime()) % tqs->stqs_count];
}
id = taskq_dispatch(tq, func, arg, flags);
if (id)
taskq_wait_id(tq, id);
}
static void
spa_create_zio_taskqs(spa_t *spa)
{
int t, q;
for (t = 0; t < ZIO_TYPES; t++) {
for (q = 0; q < ZIO_TASKQ_TYPES; q++) {
spa_taskqs_init(spa, t, q);
}
}
}
#if defined(_KERNEL) && defined(HAVE_SPA_THREAD)
static void
spa_thread(void *arg)
{
callb_cpr_t cprinfo;
spa_t *spa = arg;
user_t *pu = PTOU(curproc);
CALLB_CPR_INIT(&cprinfo, &spa->spa_proc_lock, callb_generic_cpr,
spa->spa_name);
ASSERT(curproc != &p0);
(void) snprintf(pu->u_psargs, sizeof (pu->u_psargs),
"zpool-%s", spa->spa_name);
(void) strlcpy(pu->u_comm, pu->u_psargs, sizeof (pu->u_comm));
/* bind this thread to the requested psrset */
if (zio_taskq_psrset_bind != PS_NONE) {
pool_lock();
mutex_enter(&cpu_lock);
mutex_enter(&pidlock);
mutex_enter(&curproc->p_lock);
if (cpupart_bind_thread(curthread, zio_taskq_psrset_bind,
0, NULL, NULL) == 0) {
curthread->t_bind_pset = zio_taskq_psrset_bind;
} else {
cmn_err(CE_WARN,
"Couldn't bind process for zfs pool \"%s\" to "
"pset %d\n", spa->spa_name, zio_taskq_psrset_bind);
}
mutex_exit(&curproc->p_lock);
mutex_exit(&pidlock);
mutex_exit(&cpu_lock);
pool_unlock();
}
if (zio_taskq_sysdc) {
sysdc_thread_enter(curthread, 100, 0);
}
spa->spa_proc = curproc;
spa->spa_did = curthread->t_did;
spa_create_zio_taskqs(spa);
mutex_enter(&spa->spa_proc_lock);
ASSERT(spa->spa_proc_state == SPA_PROC_CREATED);
spa->spa_proc_state = SPA_PROC_ACTIVE;
cv_broadcast(&spa->spa_proc_cv);
CALLB_CPR_SAFE_BEGIN(&cprinfo);
while (spa->spa_proc_state == SPA_PROC_ACTIVE)
cv_wait(&spa->spa_proc_cv, &spa->spa_proc_lock);
CALLB_CPR_SAFE_END(&cprinfo, &spa->spa_proc_lock);
ASSERT(spa->spa_proc_state == SPA_PROC_DEACTIVATE);
spa->spa_proc_state = SPA_PROC_GONE;
spa->spa_proc = &p0;
cv_broadcast(&spa->spa_proc_cv);
CALLB_CPR_EXIT(&cprinfo); /* drops spa_proc_lock */
mutex_enter(&curproc->p_lock);
lwp_exit();
}
#endif
/*
* Activate an uninitialized pool.
*/
static void
spa_activate(spa_t *spa, int mode)
{
ASSERT(spa->spa_state == POOL_STATE_UNINITIALIZED);
spa->spa_state = POOL_STATE_ACTIVE;
spa->spa_mode = mode;
spa->spa_normal_class = metaslab_class_create(spa, zfs_metaslab_ops);
spa->spa_log_class = metaslab_class_create(spa, zfs_metaslab_ops);
/* Try to create a covering process */
mutex_enter(&spa->spa_proc_lock);
ASSERT(spa->spa_proc_state == SPA_PROC_NONE);
ASSERT(spa->spa_proc == &p0);
spa->spa_did = 0;
#ifdef HAVE_SPA_THREAD
/* Only create a process if we're going to be around a while. */
if (spa_create_process && strcmp(spa->spa_name, TRYIMPORT_NAME) != 0) {
if (newproc(spa_thread, (caddr_t)spa, syscid, maxclsyspri,
NULL, 0) == 0) {
spa->spa_proc_state = SPA_PROC_CREATED;
while (spa->spa_proc_state == SPA_PROC_CREATED) {
cv_wait(&spa->spa_proc_cv,
&spa->spa_proc_lock);
}
ASSERT(spa->spa_proc_state == SPA_PROC_ACTIVE);
ASSERT(spa->spa_proc != &p0);
ASSERT(spa->spa_did != 0);
} else {
#ifdef _KERNEL
cmn_err(CE_WARN,
"Couldn't create process for zfs pool \"%s\"\n",
spa->spa_name);
#endif
}
}
#endif /* HAVE_SPA_THREAD */
mutex_exit(&spa->spa_proc_lock);
/* If we didn't create a process, we need to create our taskqs. */
if (spa->spa_proc == &p0) {
spa_create_zio_taskqs(spa);
}
list_create(&spa->spa_config_dirty_list, sizeof (vdev_t),
offsetof(vdev_t, vdev_config_dirty_node));
list_create(&spa->spa_state_dirty_list, sizeof (vdev_t),
offsetof(vdev_t, vdev_state_dirty_node));
txg_list_create(&spa->spa_vdev_txg_list,
offsetof(struct vdev, vdev_txg_node));
avl_create(&spa->spa_errlist_scrub,
spa_error_entry_compare, sizeof (spa_error_entry_t),
offsetof(spa_error_entry_t, se_avl));
avl_create(&spa->spa_errlist_last,
spa_error_entry_compare, sizeof (spa_error_entry_t),
offsetof(spa_error_entry_t, se_avl));
}
/*
* Opposite of spa_activate().
*/
static void
spa_deactivate(spa_t *spa)
{
int t, q;
ASSERT(spa->spa_sync_on == B_FALSE);
ASSERT(spa->spa_dsl_pool == NULL);
ASSERT(spa->spa_root_vdev == NULL);
ASSERT(spa->spa_async_zio_root == NULL);
ASSERT(spa->spa_state != POOL_STATE_UNINITIALIZED);
txg_list_destroy(&spa->spa_vdev_txg_list);
list_destroy(&spa->spa_config_dirty_list);
list_destroy(&spa->spa_state_dirty_list);
taskq_cancel_id(system_taskq, spa->spa_deadman_tqid);
for (t = 0; t < ZIO_TYPES; t++) {
for (q = 0; q < ZIO_TASKQ_TYPES; q++) {
spa_taskqs_fini(spa, t, q);
}
}
metaslab_class_destroy(spa->spa_normal_class);
spa->spa_normal_class = NULL;
metaslab_class_destroy(spa->spa_log_class);
spa->spa_log_class = NULL;
/*
* If this was part of an import or the open otherwise failed, we may
* still have errors left in the queues. Empty them just in case.
*/
spa_errlog_drain(spa);
avl_destroy(&spa->spa_errlist_scrub);
avl_destroy(&spa->spa_errlist_last);
spa->spa_state = POOL_STATE_UNINITIALIZED;
mutex_enter(&spa->spa_proc_lock);
if (spa->spa_proc_state != SPA_PROC_NONE) {
ASSERT(spa->spa_proc_state == SPA_PROC_ACTIVE);
spa->spa_proc_state = SPA_PROC_DEACTIVATE;
cv_broadcast(&spa->spa_proc_cv);
while (spa->spa_proc_state == SPA_PROC_DEACTIVATE) {
ASSERT(spa->spa_proc != &p0);
cv_wait(&spa->spa_proc_cv, &spa->spa_proc_lock);
}
ASSERT(spa->spa_proc_state == SPA_PROC_GONE);
spa->spa_proc_state = SPA_PROC_NONE;
}
ASSERT(spa->spa_proc == &p0);
mutex_exit(&spa->spa_proc_lock);
/*
* We want to make sure spa_thread() has actually exited the ZFS
* module, so that the module can't be unloaded out from underneath
* it.
*/
if (spa->spa_did != 0) {
thread_join(spa->spa_did);
spa->spa_did = 0;
}
}
/*
* Verify a pool configuration, and construct the vdev tree appropriately. This
* will create all the necessary vdevs in the appropriate layout, with each vdev
* in the CLOSED state. This will prep the pool before open/creation/import.
* All vdev validation is done by the vdev_alloc() routine.
*/
static int
spa_config_parse(spa_t *spa, vdev_t **vdp, nvlist_t *nv, vdev_t *parent,
uint_t id, int atype)
{
nvlist_t **child;
uint_t children;
int error;
int c;
if ((error = vdev_alloc(spa, vdp, nv, parent, id, atype)) != 0)
return (error);
if ((*vdp)->vdev_ops->vdev_op_leaf)
return (0);
error = nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN,
&child, &children);
if (error == ENOENT)
return (0);
if (error) {
vdev_free(*vdp);
*vdp = NULL;
return (SET_ERROR(EINVAL));
}
for (c = 0; c < children; c++) {
vdev_t *vd;
if ((error = spa_config_parse(spa, &vd, child[c], *vdp, c,
atype)) != 0) {
vdev_free(*vdp);
*vdp = NULL;
return (error);
}
}
ASSERT(*vdp != NULL);
return (0);
}
/*
* Opposite of spa_load().
*/
static void
spa_unload(spa_t *spa)
{
int i;
ASSERT(MUTEX_HELD(&spa_namespace_lock));
/*
* Stop async tasks.
*/
spa_async_suspend(spa);
/*
* Stop syncing.
*/
if (spa->spa_sync_on) {
txg_sync_stop(spa->spa_dsl_pool);
spa->spa_sync_on = B_FALSE;
}
/*
* Wait for any outstanding async I/O to complete.
*/
if (spa->spa_async_zio_root != NULL) {
(void) zio_wait(spa->spa_async_zio_root);
spa->spa_async_zio_root = NULL;
}
bpobj_close(&spa->spa_deferred_bpobj);
/*
* Close the dsl pool.
*/
if (spa->spa_dsl_pool) {
dsl_pool_close(spa->spa_dsl_pool);
spa->spa_dsl_pool = NULL;
spa->spa_meta_objset = NULL;
}
ddt_unload(spa);
spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
/*
* Drop and purge level 2 cache
*/
spa_l2cache_drop(spa);
/*
* Close all vdevs.
*/
if (spa->spa_root_vdev)
vdev_free(spa->spa_root_vdev);
ASSERT(spa->spa_root_vdev == NULL);
for (i = 0; i < spa->spa_spares.sav_count; i++)
vdev_free(spa->spa_spares.sav_vdevs[i]);
if (spa->spa_spares.sav_vdevs) {
kmem_free(spa->spa_spares.sav_vdevs,
spa->spa_spares.sav_count * sizeof (void *));
spa->spa_spares.sav_vdevs = NULL;
}
if (spa->spa_spares.sav_config) {
nvlist_free(spa->spa_spares.sav_config);
spa->spa_spares.sav_config = NULL;
}
spa->spa_spares.sav_count = 0;
for (i = 0; i < spa->spa_l2cache.sav_count; i++) {
vdev_clear_stats(spa->spa_l2cache.sav_vdevs[i]);
vdev_free(spa->spa_l2cache.sav_vdevs[i]);
}
if (spa->spa_l2cache.sav_vdevs) {
kmem_free(spa->spa_l2cache.sav_vdevs,
spa->spa_l2cache.sav_count * sizeof (void *));
spa->spa_l2cache.sav_vdevs = NULL;
}
if (spa->spa_l2cache.sav_config) {
nvlist_free(spa->spa_l2cache.sav_config);
spa->spa_l2cache.sav_config = NULL;
}
spa->spa_l2cache.sav_count = 0;
spa->spa_async_suspended = 0;
if (spa->spa_comment != NULL) {
spa_strfree(spa->spa_comment);
spa->spa_comment = NULL;
}
spa_config_exit(spa, SCL_ALL, FTAG);
}
/*
* Load (or re-load) the current list of vdevs describing the active spares for
* this pool. When this is called, we have some form of basic information in
* 'spa_spares.sav_config'. We parse this into vdevs, try to open them, and
* then re-generate a more complete list including status information.
*/
static void
spa_load_spares(spa_t *spa)
{
nvlist_t **spares;
uint_t nspares;
int i;
vdev_t *vd, *tvd;
ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL);
/*
* First, close and free any existing spare vdevs.
*/
for (i = 0; i < spa->spa_spares.sav_count; i++) {
vd = spa->spa_spares.sav_vdevs[i];
/* Undo the call to spa_activate() below */
if ((tvd = spa_lookup_by_guid(spa, vd->vdev_guid,
B_FALSE)) != NULL && tvd->vdev_isspare)
spa_spare_remove(tvd);
vdev_close(vd);
vdev_free(vd);
}
if (spa->spa_spares.sav_vdevs)
kmem_free(spa->spa_spares.sav_vdevs,
spa->spa_spares.sav_count * sizeof (void *));
if (spa->spa_spares.sav_config == NULL)
nspares = 0;
else
VERIFY(nvlist_lookup_nvlist_array(spa->spa_spares.sav_config,
ZPOOL_CONFIG_SPARES, &spares, &nspares) == 0);
spa->spa_spares.sav_count = (int)nspares;
spa->spa_spares.sav_vdevs = NULL;
if (nspares == 0)
return;
/*
* Construct the array of vdevs, opening them to get status in the
* process. For each spare, there is potentially two different vdev_t
* structures associated with it: one in the list of spares (used only
* for basic validation purposes) and one in the active vdev
* configuration (if it's spared in). During this phase we open and
* validate each vdev on the spare list. If the vdev also exists in the
* active configuration, then we also mark this vdev as an active spare.
*/
spa->spa_spares.sav_vdevs = kmem_alloc(nspares * sizeof (void *),
KM_PUSHPAGE);
for (i = 0; i < spa->spa_spares.sav_count; i++) {
VERIFY(spa_config_parse(spa, &vd, spares[i], NULL, 0,
VDEV_ALLOC_SPARE) == 0);
ASSERT(vd != NULL);
spa->spa_spares.sav_vdevs[i] = vd;
if ((tvd = spa_lookup_by_guid(spa, vd->vdev_guid,
B_FALSE)) != NULL) {
if (!tvd->vdev_isspare)
spa_spare_add(tvd);
/*
* We only mark the spare active if we were successfully
* able to load the vdev. Otherwise, importing a pool
* with a bad active spare would result in strange
* behavior, because multiple pool would think the spare
* is actively in use.
*
* There is a vulnerability here to an equally bizarre
* circumstance, where a dead active spare is later
* brought back to life (onlined or otherwise). Given
* the rarity of this scenario, and the extra complexity
* it adds, we ignore the possibility.
*/
if (!vdev_is_dead(tvd))
spa_spare_activate(tvd);
}
vd->vdev_top = vd;
vd->vdev_aux = &spa->spa_spares;
if (vdev_open(vd) != 0)
continue;
if (vdev_validate_aux(vd) == 0)
spa_spare_add(vd);
}
/*
* Recompute the stashed list of spares, with status information
* this time.
*/
VERIFY(nvlist_remove(spa->spa_spares.sav_config, ZPOOL_CONFIG_SPARES,
DATA_TYPE_NVLIST_ARRAY) == 0);
spares = kmem_alloc(spa->spa_spares.sav_count * sizeof (void *),
KM_PUSHPAGE);
for (i = 0; i < spa->spa_spares.sav_count; i++)
spares[i] = vdev_config_generate(spa,
spa->spa_spares.sav_vdevs[i], B_TRUE, VDEV_CONFIG_SPARE);
VERIFY(nvlist_add_nvlist_array(spa->spa_spares.sav_config,
ZPOOL_CONFIG_SPARES, spares, spa->spa_spares.sav_count) == 0);
for (i = 0; i < spa->spa_spares.sav_count; i++)
nvlist_free(spares[i]);
kmem_free(spares, spa->spa_spares.sav_count * sizeof (void *));
}
/*
* Load (or re-load) the current list of vdevs describing the active l2cache for
* this pool. When this is called, we have some form of basic information in
* 'spa_l2cache.sav_config'. We parse this into vdevs, try to open them, and
* then re-generate a more complete list including status information.
* Devices which are already active have their details maintained, and are
* not re-opened.
*/
static void
spa_load_l2cache(spa_t *spa)
{
nvlist_t **l2cache;
uint_t nl2cache;
int i, j, oldnvdevs;
uint64_t guid;
vdev_t *vd, **oldvdevs, **newvdevs;
spa_aux_vdev_t *sav = &spa->spa_l2cache;
ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL);
if (sav->sav_config != NULL) {
VERIFY(nvlist_lookup_nvlist_array(sav->sav_config,
ZPOOL_CONFIG_L2CACHE, &l2cache, &nl2cache) == 0);
newvdevs = kmem_alloc(nl2cache * sizeof (void *), KM_PUSHPAGE);
} else {
nl2cache = 0;
newvdevs = NULL;
}
oldvdevs = sav->sav_vdevs;
oldnvdevs = sav->sav_count;
sav->sav_vdevs = NULL;
sav->sav_count = 0;
/*
* Process new nvlist of vdevs.
*/
for (i = 0; i < nl2cache; i++) {
VERIFY(nvlist_lookup_uint64(l2cache[i], ZPOOL_CONFIG_GUID,
&guid) == 0);
newvdevs[i] = NULL;
for (j = 0; j < oldnvdevs; j++) {
vd = oldvdevs[j];
if (vd != NULL && guid == vd->vdev_guid) {
/*
* Retain previous vdev for add/remove ops.
*/
newvdevs[i] = vd;
oldvdevs[j] = NULL;
break;
}
}
if (newvdevs[i] == NULL) {
/*
* Create new vdev
*/
VERIFY(spa_config_parse(spa, &vd, l2cache[i], NULL, 0,
VDEV_ALLOC_L2CACHE) == 0);
ASSERT(vd != NULL);
newvdevs[i] = vd;
/*
* Commit this vdev as an l2cache device,
* even if it fails to open.
*/
spa_l2cache_add(vd);
vd->vdev_top = vd;
vd->vdev_aux = sav;
spa_l2cache_activate(vd);
if (vdev_open(vd) != 0)
continue;
(void) vdev_validate_aux(vd);
if (!vdev_is_dead(vd))
l2arc_add_vdev(spa, vd);
}
}
/*
* Purge vdevs that were dropped
*/
for (i = 0; i < oldnvdevs; i++) {
uint64_t pool;
vd = oldvdevs[i];
if (vd != NULL) {
ASSERT(vd->vdev_isl2cache);
if (spa_l2cache_exists(vd->vdev_guid, &pool) &&
pool != 0ULL && l2arc_vdev_present(vd))
l2arc_remove_vdev(vd);
vdev_clear_stats(vd);
vdev_free(vd);
}
}
if (oldvdevs)
kmem_free(oldvdevs, oldnvdevs * sizeof (void *));
if (sav->sav_config == NULL)
goto out;
sav->sav_vdevs = newvdevs;
sav->sav_count = (int)nl2cache;
/*
* Recompute the stashed list of l2cache devices, with status
* information this time.
*/
VERIFY(nvlist_remove(sav->sav_config, ZPOOL_CONFIG_L2CACHE,
DATA_TYPE_NVLIST_ARRAY) == 0);
l2cache = kmem_alloc(sav->sav_count * sizeof (void *), KM_PUSHPAGE);
for (i = 0; i < sav->sav_count; i++)
l2cache[i] = vdev_config_generate(spa,
sav->sav_vdevs[i], B_TRUE, VDEV_CONFIG_L2CACHE);
VERIFY(nvlist_add_nvlist_array(sav->sav_config,
ZPOOL_CONFIG_L2CACHE, l2cache, sav->sav_count) == 0);
out:
for (i = 0; i < sav->sav_count; i++)
nvlist_free(l2cache[i]);
if (sav->sav_count)
kmem_free(l2cache, sav->sav_count * sizeof (void *));
}
static int
load_nvlist(spa_t *spa, uint64_t obj, nvlist_t **value)
{
dmu_buf_t *db;
char *packed = NULL;
size_t nvsize = 0;
int error;
*value = NULL;
error = dmu_bonus_hold(spa->spa_meta_objset, obj, FTAG, &db);
if (error)
return (error);
nvsize = *(uint64_t *)db->db_data;
dmu_buf_rele(db, FTAG);
packed = kmem_alloc(nvsize, KM_PUSHPAGE | KM_NODEBUG);
error = dmu_read(spa->spa_meta_objset, obj, 0, nvsize, packed,
DMU_READ_PREFETCH);
if (error == 0)
error = nvlist_unpack(packed, nvsize, value, 0);
kmem_free(packed, nvsize);
return (error);
}
/*
* Checks to see if the given vdev could not be opened, in which case we post a
* sysevent to notify the autoreplace code that the device has been removed.
*/
static void
spa_check_removed(vdev_t *vd)
{
int c;
for (c = 0; c < vd->vdev_children; c++)
spa_check_removed(vd->vdev_child[c]);
if (vd->vdev_ops->vdev_op_leaf && vdev_is_dead(vd) &&
!vd->vdev_ishole) {
zfs_ereport_post(FM_EREPORT_RESOURCE_AUTOREPLACE,
vd->vdev_spa, vd, NULL, 0, 0);
spa_event_notify(vd->vdev_spa, vd, FM_EREPORT_ZFS_DEVICE_CHECK);
}
}
/*
* Validate the current config against the MOS config
*/
static boolean_t
spa_config_valid(spa_t *spa, nvlist_t *config)
{
vdev_t *mrvd, *rvd = spa->spa_root_vdev;
nvlist_t *nv;
int c, i;
VERIFY(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, &nv) == 0);
spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
VERIFY(spa_config_parse(spa, &mrvd, nv, NULL, 0, VDEV_ALLOC_LOAD) == 0);
ASSERT3U(rvd->vdev_children, ==, mrvd->vdev_children);
/*
* If we're doing a normal import, then build up any additional
* diagnostic information about missing devices in this config.
* We'll pass this up to the user for further processing.
*/
if (!(spa->spa_import_flags & ZFS_IMPORT_MISSING_LOG)) {
nvlist_t **child, *nv;
uint64_t idx = 0;
child = kmem_alloc(rvd->vdev_children * sizeof (nvlist_t **),
KM_PUSHPAGE);
VERIFY(nvlist_alloc(&nv, NV_UNIQUE_NAME, KM_PUSHPAGE) == 0);
for (c = 0; c < rvd->vdev_children; c++) {
vdev_t *tvd = rvd->vdev_child[c];
vdev_t *mtvd = mrvd->vdev_child[c];
if (tvd->vdev_ops == &vdev_missing_ops &&
mtvd->vdev_ops != &vdev_missing_ops &&
mtvd->vdev_islog)
child[idx++] = vdev_config_generate(spa, mtvd,
B_FALSE, 0);
}
if (idx) {
VERIFY(nvlist_add_nvlist_array(nv,
ZPOOL_CONFIG_CHILDREN, child, idx) == 0);
VERIFY(nvlist_add_nvlist(spa->spa_load_info,
ZPOOL_CONFIG_MISSING_DEVICES, nv) == 0);
for (i = 0; i < idx; i++)
nvlist_free(child[i]);
}
nvlist_free(nv);
kmem_free(child, rvd->vdev_children * sizeof (char **));
}
/*
* Compare the root vdev tree with the information we have
* from the MOS config (mrvd). Check each top-level vdev
* with the corresponding MOS config top-level (mtvd).
*/
for (c = 0; c < rvd->vdev_children; c++) {
vdev_t *tvd = rvd->vdev_child[c];
vdev_t *mtvd = mrvd->vdev_child[c];
/*
* Resolve any "missing" vdevs in the current configuration.
* If we find that the MOS config has more accurate information
* about the top-level vdev then use that vdev instead.
*/
if (tvd->vdev_ops == &vdev_missing_ops &&
mtvd->vdev_ops != &vdev_missing_ops) {
if (!(spa->spa_import_flags & ZFS_IMPORT_MISSING_LOG))
continue;
/*
* Device specific actions.
*/
if (mtvd->vdev_islog) {
spa_set_log_state(spa, SPA_LOG_CLEAR);
} else {
/*
* XXX - once we have 'readonly' pool
* support we should be able to handle
* missing data devices by transitioning
* the pool to readonly.
*/
continue;
}
/*
* Swap the missing vdev with the data we were
* able to obtain from the MOS config.
*/
vdev_remove_child(rvd, tvd);
vdev_remove_child(mrvd, mtvd);
vdev_add_child(rvd, mtvd);
vdev_add_child(mrvd, tvd);
spa_config_exit(spa, SCL_ALL, FTAG);
vdev_load(mtvd);
spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
vdev_reopen(rvd);
} else if (mtvd->vdev_islog) {
/*
* Load the slog device's state from the MOS config
* since it's possible that the label does not
* contain the most up-to-date information.
*/
vdev_load_log_state(tvd, mtvd);
vdev_reopen(tvd);
}
}
vdev_free(mrvd);
spa_config_exit(spa, SCL_ALL, FTAG);
/*
* Ensure we were able to validate the config.
*/
return (rvd->vdev_guid_sum == spa->spa_uberblock.ub_guid_sum);
}
/*
* Check for missing log devices
*/
static boolean_t
spa_check_logs(spa_t *spa)
{
boolean_t rv = B_FALSE;
switch (spa->spa_log_state) {
default:
break;
case SPA_LOG_MISSING:
/* need to recheck in case slog has been restored */
case SPA_LOG_UNKNOWN:
rv = (dmu_objset_find(spa->spa_name, zil_check_log_chain,
NULL, DS_FIND_CHILDREN) != 0);
if (rv)
spa_set_log_state(spa, SPA_LOG_MISSING);
break;
}
return (rv);
}
static boolean_t
spa_passivate_log(spa_t *spa)
{
vdev_t *rvd = spa->spa_root_vdev;
boolean_t slog_found = B_FALSE;
int c;
ASSERT(spa_config_held(spa, SCL_ALLOC, RW_WRITER));
if (!spa_has_slogs(spa))
return (B_FALSE);
for (c = 0; c < rvd->vdev_children; c++) {
vdev_t *tvd = rvd->vdev_child[c];
metaslab_group_t *mg = tvd->vdev_mg;
if (tvd->vdev_islog) {
metaslab_group_passivate(mg);
slog_found = B_TRUE;
}
}
return (slog_found);
}
static void
spa_activate_log(spa_t *spa)
{
vdev_t *rvd = spa->spa_root_vdev;
int c;
ASSERT(spa_config_held(spa, SCL_ALLOC, RW_WRITER));
for (c = 0; c < rvd->vdev_children; c++) {
vdev_t *tvd = rvd->vdev_child[c];
metaslab_group_t *mg = tvd->vdev_mg;
if (tvd->vdev_islog)
metaslab_group_activate(mg);
}
}
int
spa_offline_log(spa_t *spa)
{
int error;
error = dmu_objset_find(spa_name(spa), zil_vdev_offline,
NULL, DS_FIND_CHILDREN);
if (error == 0) {
/*
* We successfully offlined the log device, sync out the
* current txg so that the "stubby" block can be removed
* by zil_sync().
*/
txg_wait_synced(spa->spa_dsl_pool, 0);
}
return (error);
}
static void
spa_aux_check_removed(spa_aux_vdev_t *sav)
{
int i;
for (i = 0; i < sav->sav_count; i++)
spa_check_removed(sav->sav_vdevs[i]);
}
void
spa_claim_notify(zio_t *zio)
{
spa_t *spa = zio->io_spa;
if (zio->io_error)
return;
mutex_enter(&spa->spa_props_lock); /* any mutex will do */
if (spa->spa_claim_max_txg < zio->io_bp->blk_birth)
spa->spa_claim_max_txg = zio->io_bp->blk_birth;
mutex_exit(&spa->spa_props_lock);
}
typedef struct spa_load_error {
uint64_t sle_meta_count;
uint64_t sle_data_count;
} spa_load_error_t;
static void
spa_load_verify_done(zio_t *zio)
{
blkptr_t *bp = zio->io_bp;
spa_load_error_t *sle = zio->io_private;
dmu_object_type_t type = BP_GET_TYPE(bp);
int error = zio->io_error;
if (error) {
if ((BP_GET_LEVEL(bp) != 0 || DMU_OT_IS_METADATA(type)) &&
type != DMU_OT_INTENT_LOG)
atomic_add_64(&sle->sle_meta_count, 1);
else
atomic_add_64(&sle->sle_data_count, 1);
}
zio_data_buf_free(zio->io_data, zio->io_size);
}
/*ARGSUSED*/
static int
spa_load_verify_cb(spa_t *spa, zilog_t *zilog, const blkptr_t *bp,
const zbookmark_t *zb, const dnode_phys_t *dnp, void *arg)
{
if (bp != NULL) {
zio_t *rio = arg;
size_t size = BP_GET_PSIZE(bp);
void *data = zio_data_buf_alloc(size);
zio_nowait(zio_read(rio, spa, bp, data, size,
spa_load_verify_done, rio->io_private, ZIO_PRIORITY_SCRUB,
ZIO_FLAG_SPECULATIVE | ZIO_FLAG_CANFAIL |
ZIO_FLAG_SCRUB | ZIO_FLAG_RAW, zb));
}
return (0);
}
static int
spa_load_verify(spa_t *spa)
{
zio_t *rio;
spa_load_error_t sle = { 0 };
zpool_rewind_policy_t policy;
boolean_t verify_ok = B_FALSE;
int error;
zpool_get_rewind_policy(spa->spa_config, &policy);
if (policy.zrp_request & ZPOOL_NEVER_REWIND)
return (0);
rio = zio_root(spa, NULL, &sle,
ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE);
error = traverse_pool(spa, spa->spa_verify_min_txg,
TRAVERSE_PRE | TRAVERSE_PREFETCH, spa_load_verify_cb, rio);
(void) zio_wait(rio);
spa->spa_load_meta_errors = sle.sle_meta_count;
spa->spa_load_data_errors = sle.sle_data_count;
if (!error && sle.sle_meta_count <= policy.zrp_maxmeta &&
sle.sle_data_count <= policy.zrp_maxdata) {
int64_t loss = 0;
verify_ok = B_TRUE;
spa->spa_load_txg = spa->spa_uberblock.ub_txg;
spa->spa_load_txg_ts = spa->spa_uberblock.ub_timestamp;
loss = spa->spa_last_ubsync_txg_ts - spa->spa_load_txg_ts;
VERIFY(nvlist_add_uint64(spa->spa_load_info,
ZPOOL_CONFIG_LOAD_TIME, spa->spa_load_txg_ts) == 0);
VERIFY(nvlist_add_int64(spa->spa_load_info,
ZPOOL_CONFIG_REWIND_TIME, loss) == 0);
VERIFY(nvlist_add_uint64(spa->spa_load_info,
ZPOOL_CONFIG_LOAD_DATA_ERRORS, sle.sle_data_count) == 0);
} else {
spa->spa_load_max_txg = spa->spa_uberblock.ub_txg;
}
if (error) {
if (error != ENXIO && error != EIO)
error = SET_ERROR(EIO);
return (error);
}
return (verify_ok ? 0 : EIO);
}
/*
* Find a value in the pool props object.
*/
static void
spa_prop_find(spa_t *spa, zpool_prop_t prop, uint64_t *val)
{
(void) zap_lookup(spa->spa_meta_objset, spa->spa_pool_props_object,
zpool_prop_to_name(prop), sizeof (uint64_t), 1, val);
}
/*
* Find a value in the pool directory object.
*/
static int
spa_dir_prop(spa_t *spa, const char *name, uint64_t *val)
{
return (zap_lookup(spa->spa_meta_objset, DMU_POOL_DIRECTORY_OBJECT,
name, sizeof (uint64_t), 1, val));
}
static int
spa_vdev_err(vdev_t *vdev, vdev_aux_t aux, int err)
{
vdev_set_state(vdev, B_TRUE, VDEV_STATE_CANT_OPEN, aux);
return (err);
}
/*
* Fix up config after a partly-completed split. This is done with the
* ZPOOL_CONFIG_SPLIT nvlist. Both the splitting pool and the split-off
* pool have that entry in their config, but only the splitting one contains
* a list of all the guids of the vdevs that are being split off.
*
* This function determines what to do with that list: either rejoin
* all the disks to the pool, or complete the splitting process. To attempt
* the rejoin, each disk that is offlined is marked online again, and
* we do a reopen() call. If the vdev label for every disk that was
* marked online indicates it was successfully split off (VDEV_AUX_SPLIT_POOL)
* then we call vdev_split() on each disk, and complete the split.
*
* Otherwise we leave the config alone, with all the vdevs in place in
* the original pool.
*/
static void
spa_try_repair(spa_t *spa, nvlist_t *config)
{
uint_t extracted;
uint64_t *glist;
uint_t i, gcount;
nvlist_t *nvl;
vdev_t **vd;
boolean_t attempt_reopen;
if (nvlist_lookup_nvlist(config, ZPOOL_CONFIG_SPLIT, &nvl) != 0)
return;
/* check that the config is complete */
if (nvlist_lookup_uint64_array(nvl, ZPOOL_CONFIG_SPLIT_LIST,
&glist, &gcount) != 0)
return;
vd = kmem_zalloc(gcount * sizeof (vdev_t *), KM_PUSHPAGE);
/* attempt to online all the vdevs & validate */
attempt_reopen = B_TRUE;
for (i = 0; i < gcount; i++) {
if (glist[i] == 0) /* vdev is hole */
continue;
vd[i] = spa_lookup_by_guid(spa, glist[i], B_FALSE);
if (vd[i] == NULL) {
/*
* Don't bother attempting to reopen the disks;
* just do the split.
*/
attempt_reopen = B_FALSE;
} else {
/* attempt to re-online it */
vd[i]->vdev_offline = B_FALSE;
}
}
if (attempt_reopen) {
vdev_reopen(spa->spa_root_vdev);
/* check each device to see what state it's in */
for (extracted = 0, i = 0; i < gcount; i++) {
if (vd[i] != NULL &&
vd[i]->vdev_stat.vs_aux != VDEV_AUX_SPLIT_POOL)
break;
++extracted;
}
}
/*
* If every disk has been moved to the new pool, or if we never
* even attempted to look at them, then we split them off for
* good.
*/
if (!attempt_reopen || gcount == extracted) {
for (i = 0; i < gcount; i++)
if (vd[i] != NULL)
vdev_split(vd[i]);
vdev_reopen(spa->spa_root_vdev);
}
kmem_free(vd, gcount * sizeof (vdev_t *));
}
static int
spa_load(spa_t *spa, spa_load_state_t state, spa_import_type_t type,
boolean_t mosconfig)
{
nvlist_t *config = spa->spa_config;
char *ereport = FM_EREPORT_ZFS_POOL;
char *comment;
int error;
uint64_t pool_guid;
nvlist_t *nvl;
if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID, &pool_guid))
return (SET_ERROR(EINVAL));
ASSERT(spa->spa_comment == NULL);
if (nvlist_lookup_string(config, ZPOOL_CONFIG_COMMENT, &comment) == 0)
spa->spa_comment = spa_strdup(comment);
/*
* Versioning wasn't explicitly added to the label until later, so if
* it's not present treat it as the initial version.
*/
if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_VERSION,
&spa->spa_ubsync.ub_version) != 0)
spa->spa_ubsync.ub_version = SPA_VERSION_INITIAL;
(void) nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_TXG,
&spa->spa_config_txg);
if ((state == SPA_LOAD_IMPORT || state == SPA_LOAD_TRYIMPORT) &&
spa_guid_exists(pool_guid, 0)) {
error = SET_ERROR(EEXIST);
} else {
spa->spa_config_guid = pool_guid;
if (nvlist_lookup_nvlist(config, ZPOOL_CONFIG_SPLIT,
&nvl) == 0) {
VERIFY(nvlist_dup(nvl, &spa->spa_config_splitting,
KM_PUSHPAGE) == 0);
}
nvlist_free(spa->spa_load_info);
spa->spa_load_info = fnvlist_alloc();
gethrestime(&spa->spa_loaded_ts);
error = spa_load_impl(spa, pool_guid, config, state, type,
mosconfig, &ereport);
}
spa->spa_minref = refcount_count(&spa->spa_refcount);
if (error) {
if (error != EEXIST) {
spa->spa_loaded_ts.tv_sec = 0;
spa->spa_loaded_ts.tv_nsec = 0;
}
if (error != EBADF) {
zfs_ereport_post(ereport, spa, NULL, NULL, 0, 0);
}
}
spa->spa_load_state = error ? SPA_LOAD_ERROR : SPA_LOAD_NONE;
spa->spa_ena = 0;
return (error);
}
/*
* Load an existing storage pool, using the pool's builtin spa_config as a
* source of configuration information.
*/
__attribute__((always_inline))
static inline int
spa_load_impl(spa_t *spa, uint64_t pool_guid, nvlist_t *config,
spa_load_state_t state, spa_import_type_t type, boolean_t mosconfig,
char **ereport)
{
int error = 0;
nvlist_t *nvroot = NULL;
nvlist_t *label;
vdev_t *rvd;
uberblock_t *ub = &spa->spa_uberblock;
uint64_t children, config_cache_txg = spa->spa_config_txg;
int orig_mode = spa->spa_mode;
int parse;
uint64_t obj;
boolean_t missing_feat_write = B_FALSE;
/*
* If this is an untrusted config, access the pool in read-only mode.
* This prevents things like resilvering recently removed devices.
*/
if (!mosconfig)
spa->spa_mode = FREAD;
ASSERT(MUTEX_HELD(&spa_namespace_lock));
spa->spa_load_state = state;
if (nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, &nvroot))
return (SET_ERROR(EINVAL));
parse = (type == SPA_IMPORT_EXISTING ?
VDEV_ALLOC_LOAD : VDEV_ALLOC_SPLIT);
/*
* Create "The Godfather" zio to hold all async IOs
*/
spa->spa_async_zio_root = zio_root(spa, NULL, NULL,
ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE | ZIO_FLAG_GODFATHER);
/*
* Parse the configuration into a vdev tree. We explicitly set the
* value that will be returned by spa_version() since parsing the
* configuration requires knowing the version number.
*/
spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
error = spa_config_parse(spa, &rvd, nvroot, NULL, 0, parse);
spa_config_exit(spa, SCL_ALL, FTAG);
if (error != 0)
return (error);
ASSERT(spa->spa_root_vdev == rvd);
if (type != SPA_IMPORT_ASSEMBLE) {
ASSERT(spa_guid(spa) == pool_guid);
}
/*
* Try to open all vdevs, loading each label in the process.
*/
spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
error = vdev_open(rvd);
spa_config_exit(spa, SCL_ALL, FTAG);
if (error != 0)
return (error);
/*
* We need to validate the vdev labels against the configuration that
* we have in hand, which is dependent on the setting of mosconfig. If
* mosconfig is true then we're validating the vdev labels based on
* that config. Otherwise, we're validating against the cached config
* (zpool.cache) that was read when we loaded the zfs module, and then
* later we will recursively call spa_load() and validate against
* the vdev config.
*
* If we're assembling a new pool that's been split off from an
* existing pool, the labels haven't yet been updated so we skip
* validation for now.
*/
if (type != SPA_IMPORT_ASSEMBLE) {
spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
error = vdev_validate(rvd, mosconfig);
spa_config_exit(spa, SCL_ALL, FTAG);
if (error != 0)
return (error);
if (rvd->vdev_state <= VDEV_STATE_CANT_OPEN)
return (SET_ERROR(ENXIO));
}
/*
* Find the best uberblock.
*/
vdev_uberblock_load(rvd, ub, &label);
/*
* If we weren't able to find a single valid uberblock, return failure.
*/
if (ub->ub_txg == 0) {
nvlist_free(label);
return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, ENXIO));
}
/*
* If the pool has an unsupported version we can't open it.
*/
if (!SPA_VERSION_IS_SUPPORTED(ub->ub_version)) {
nvlist_free(label);
return (spa_vdev_err(rvd, VDEV_AUX_VERSION_NEWER, ENOTSUP));
}
if (ub->ub_version >= SPA_VERSION_FEATURES) {
nvlist_t *features;
/*
* If we weren't able to find what's necessary for reading the
* MOS in the label, return failure.
*/
if (label == NULL || nvlist_lookup_nvlist(label,
ZPOOL_CONFIG_FEATURES_FOR_READ, &features) != 0) {
nvlist_free(label);
return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA,
ENXIO));
}
/*
* Update our in-core representation with the definitive values
* from the label.
*/
nvlist_free(spa->spa_label_features);
VERIFY(nvlist_dup(features, &spa->spa_label_features, 0) == 0);
}
nvlist_free(label);
/*
* Look through entries in the label nvlist's features_for_read. If
* there is a feature listed there which we don't understand then we
* cannot open a pool.
*/
if (ub->ub_version >= SPA_VERSION_FEATURES) {
nvlist_t *unsup_feat;
nvpair_t *nvp;
VERIFY(nvlist_alloc(&unsup_feat, NV_UNIQUE_NAME, KM_SLEEP) ==
0);
for (nvp = nvlist_next_nvpair(spa->spa_label_features, NULL);
nvp != NULL;
nvp = nvlist_next_nvpair(spa->spa_label_features, nvp)) {
if (!zfeature_is_supported(nvpair_name(nvp))) {
VERIFY(nvlist_add_string(unsup_feat,
nvpair_name(nvp), "") == 0);
}
}
if (!nvlist_empty(unsup_feat)) {
VERIFY(nvlist_add_nvlist(spa->spa_load_info,
ZPOOL_CONFIG_UNSUP_FEAT, unsup_feat) == 0);
nvlist_free(unsup_feat);
return (spa_vdev_err(rvd, VDEV_AUX_UNSUP_FEAT,
ENOTSUP));
}
nvlist_free(unsup_feat);
}
/*
* If the vdev guid sum doesn't match the uberblock, we have an
* incomplete configuration. We first check to see if the pool
* is aware of the complete config (i.e ZPOOL_CONFIG_VDEV_CHILDREN).
* If it is, defer the vdev_guid_sum check till later so we
* can handle missing vdevs.
*/
if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_VDEV_CHILDREN,
&children) != 0 && mosconfig && type != SPA_IMPORT_ASSEMBLE &&
rvd->vdev_guid_sum != ub->ub_guid_sum)
return (spa_vdev_err(rvd, VDEV_AUX_BAD_GUID_SUM, ENXIO));
if (type != SPA_IMPORT_ASSEMBLE && spa->spa_config_splitting) {
spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
spa_try_repair(spa, config);
spa_config_exit(spa, SCL_ALL, FTAG);
nvlist_free(spa->spa_config_splitting);
spa->spa_config_splitting = NULL;
}
/*
* Initialize internal SPA structures.
*/
spa->spa_state = POOL_STATE_ACTIVE;
spa->spa_ubsync = spa->spa_uberblock;
spa->spa_verify_min_txg = spa->spa_extreme_rewind ?
TXG_INITIAL - 1 : spa_last_synced_txg(spa) - TXG_DEFER_SIZE - 1;
spa->spa_first_txg = spa->spa_last_ubsync_txg ?
spa->spa_last_ubsync_txg : spa_last_synced_txg(spa) + 1;
spa->spa_claim_max_txg = spa->spa_first_txg;
spa->spa_prev_software_version = ub->ub_software_version;
error = dsl_pool_init(spa, spa->spa_first_txg, &spa->spa_dsl_pool);
if (error)
return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO));
spa->spa_meta_objset = spa->spa_dsl_pool->dp_meta_objset;
if (spa_dir_prop(spa, DMU_POOL_CONFIG, &spa->spa_config_object) != 0)
return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO));
if (spa_version(spa) >= SPA_VERSION_FEATURES) {
boolean_t missing_feat_read = B_FALSE;
nvlist_t *unsup_feat, *enabled_feat;
if (spa_dir_prop(spa, DMU_POOL_FEATURES_FOR_READ,
&spa->spa_feat_for_read_obj) != 0) {
return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO));
}
if (spa_dir_prop(spa, DMU_POOL_FEATURES_FOR_WRITE,
&spa->spa_feat_for_write_obj) != 0) {
return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO));
}
if (spa_dir_prop(spa, DMU_POOL_FEATURE_DESCRIPTIONS,
&spa->spa_feat_desc_obj) != 0) {
return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO));
}
enabled_feat = fnvlist_alloc();
unsup_feat = fnvlist_alloc();
if (!feature_is_supported(spa->spa_meta_objset,
spa->spa_feat_for_read_obj, spa->spa_feat_desc_obj,
unsup_feat, enabled_feat))
missing_feat_read = B_TRUE;
if (spa_writeable(spa) || state == SPA_LOAD_TRYIMPORT) {
if (!feature_is_supported(spa->spa_meta_objset,
spa->spa_feat_for_write_obj, spa->spa_feat_desc_obj,
unsup_feat, enabled_feat)) {
missing_feat_write = B_TRUE;
}
}
fnvlist_add_nvlist(spa->spa_load_info,
ZPOOL_CONFIG_ENABLED_FEAT, enabled_feat);
if (!nvlist_empty(unsup_feat)) {
fnvlist_add_nvlist(spa->spa_load_info,
ZPOOL_CONFIG_UNSUP_FEAT, unsup_feat);
}
fnvlist_free(enabled_feat);
fnvlist_free(unsup_feat);
if (!missing_feat_read) {
fnvlist_add_boolean(spa->spa_load_info,
ZPOOL_CONFIG_CAN_RDONLY);
}
/*
* If the state is SPA_LOAD_TRYIMPORT, our objective is
* twofold: to determine whether the pool is available for
* import in read-write mode and (if it is not) whether the
* pool is available for import in read-only mode. If the pool
* is available for import in read-write mode, it is displayed
* as available in userland; if it is not available for import
* in read-only mode, it is displayed as unavailable in
* userland. If the pool is available for import in read-only
* mode but not read-write mode, it is displayed as unavailable
* in userland with a special note that the pool is actually
* available for open in read-only mode.
*
* As a result, if the state is SPA_LOAD_TRYIMPORT and we are
* missing a feature for write, we must first determine whether
* the pool can be opened read-only before returning to
* userland in order to know whether to display the
* abovementioned note.
*/
if (missing_feat_read || (missing_feat_write &&
spa_writeable(spa))) {
return (spa_vdev_err(rvd, VDEV_AUX_UNSUP_FEAT,
ENOTSUP));
}
}
spa->spa_is_initializing = B_TRUE;
error = dsl_pool_open(spa->spa_dsl_pool);
spa->spa_is_initializing = B_FALSE;
if (error != 0)
return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO));
if (!mosconfig) {
uint64_t hostid;
nvlist_t *policy = NULL, *nvconfig;
if (load_nvlist(spa, spa->spa_config_object, &nvconfig) != 0)
return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO));
if (!spa_is_root(spa) && nvlist_lookup_uint64(nvconfig,
ZPOOL_CONFIG_HOSTID, &hostid) == 0) {
char *hostname;
unsigned long myhostid = 0;
VERIFY(nvlist_lookup_string(nvconfig,
ZPOOL_CONFIG_HOSTNAME, &hostname) == 0);
#ifdef _KERNEL
myhostid = zone_get_hostid(NULL);
#else /* _KERNEL */
/*
* We're emulating the system's hostid in userland, so
* we can't use zone_get_hostid().
*/
(void) ddi_strtoul(hw_serial, NULL, 10, &myhostid);
#endif /* _KERNEL */
if (hostid != 0 && myhostid != 0 &&
hostid != myhostid) {
nvlist_free(nvconfig);
cmn_err(CE_WARN, "pool '%s' could not be "
"loaded as it was last accessed by "
"another system (host: %s hostid: 0x%lx). "
"See: http://zfsonlinux.org/msg/ZFS-8000-EY",
spa_name(spa), hostname,
(unsigned long)hostid);
return (SET_ERROR(EBADF));
}
}
if (nvlist_lookup_nvlist(spa->spa_config,
ZPOOL_REWIND_POLICY, &policy) == 0)
VERIFY(nvlist_add_nvlist(nvconfig,
ZPOOL_REWIND_POLICY, policy) == 0);
spa_config_set(spa, nvconfig);
spa_unload(spa);
spa_deactivate(spa);
spa_activate(spa, orig_mode);
return (spa_load(spa, state, SPA_IMPORT_EXISTING, B_TRUE));
}
if (spa_dir_prop(spa, DMU_POOL_SYNC_BPOBJ, &obj) != 0)
return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO));
error = bpobj_open(&spa->spa_deferred_bpobj, spa->spa_meta_objset, obj);
if (error != 0)
return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO));
/*
* Load the bit that tells us to use the new accounting function
* (raid-z deflation). If we have an older pool, this will not
* be present.
*/
error = spa_dir_prop(spa, DMU_POOL_DEFLATE, &spa->spa_deflate);
if (error != 0 && error != ENOENT)
return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO));
error = spa_dir_prop(spa, DMU_POOL_CREATION_VERSION,
&spa->spa_creation_version);
if (error != 0 && error != ENOENT)
return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO));
/*
* Load the persistent error log. If we have an older pool, this will
* not be present.
*/
error = spa_dir_prop(spa, DMU_POOL_ERRLOG_LAST, &spa->spa_errlog_last);
if (error != 0 && error != ENOENT)
return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO));
error = spa_dir_prop(spa, DMU_POOL_ERRLOG_SCRUB,
&spa->spa_errlog_scrub);
if (error != 0 && error != ENOENT)
return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO));
/*
* Load the history object. If we have an older pool, this
* will not be present.
*/
error = spa_dir_prop(spa, DMU_POOL_HISTORY, &spa->spa_history);
if (error != 0 && error != ENOENT)
return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO));
/*
* If we're assembling the pool from the split-off vdevs of
* an existing pool, we don't want to attach the spares & cache
* devices.
*/
/*
* Load any hot spares for this pool.
*/
error = spa_dir_prop(spa, DMU_POOL_SPARES, &spa->spa_spares.sav_object);
if (error != 0 && error != ENOENT)
return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO));
if (error == 0 && type != SPA_IMPORT_ASSEMBLE) {
ASSERT(spa_version(spa) >= SPA_VERSION_SPARES);
if (load_nvlist(spa, spa->spa_spares.sav_object,
&spa->spa_spares.sav_config) != 0)
return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO));
spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
spa_load_spares(spa);
spa_config_exit(spa, SCL_ALL, FTAG);
} else if (error == 0) {
spa->spa_spares.sav_sync = B_TRUE;
}
/*
* Load any level 2 ARC devices for this pool.
*/
error = spa_dir_prop(spa, DMU_POOL_L2CACHE,
&spa->spa_l2cache.sav_object);
if (error != 0 && error != ENOENT)
return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO));
if (error == 0 && type != SPA_IMPORT_ASSEMBLE) {
ASSERT(spa_version(spa) >= SPA_VERSION_L2CACHE);
if (load_nvlist(spa, spa->spa_l2cache.sav_object,
&spa->spa_l2cache.sav_config) != 0)
return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO));
spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
spa_load_l2cache(spa);
spa_config_exit(spa, SCL_ALL, FTAG);
} else if (error == 0) {
spa->spa_l2cache.sav_sync = B_TRUE;
}
spa->spa_delegation = zpool_prop_default_numeric(ZPOOL_PROP_DELEGATION);
error = spa_dir_prop(spa, DMU_POOL_PROPS, &spa->spa_pool_props_object);
if (error && error != ENOENT)
return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO));
if (error == 0) {
uint64_t autoreplace;
spa_prop_find(spa, ZPOOL_PROP_BOOTFS, &spa->spa_bootfs);
spa_prop_find(spa, ZPOOL_PROP_AUTOREPLACE, &autoreplace);
spa_prop_find(spa, ZPOOL_PROP_DELEGATION, &spa->spa_delegation);
spa_prop_find(spa, ZPOOL_PROP_FAILUREMODE, &spa->spa_failmode);
spa_prop_find(spa, ZPOOL_PROP_AUTOEXPAND, &spa->spa_autoexpand);
spa_prop_find(spa, ZPOOL_PROP_DEDUPDITTO,
&spa->spa_dedup_ditto);
spa->spa_autoreplace = (autoreplace != 0);
}
/*
* If the 'autoreplace' property is set, then post a resource notifying
* the ZFS DE that it should not issue any faults for unopenable
* devices. We also iterate over the vdevs, and post a sysevent for any
* unopenable vdevs so that the normal autoreplace handler can take
* over.
*/
if (spa->spa_autoreplace && state != SPA_LOAD_TRYIMPORT) {
spa_check_removed(spa->spa_root_vdev);
/*
* For the import case, this is done in spa_import(), because
* at this point we're using the spare definitions from
* the MOS config, not necessarily from the userland config.
*/
if (state != SPA_LOAD_IMPORT) {
spa_aux_check_removed(&spa->spa_spares);
spa_aux_check_removed(&spa->spa_l2cache);
}
}
/*
* Load the vdev state for all toplevel vdevs.
*/
vdev_load(rvd);
/*
* Propagate the leaf DTLs we just loaded all the way up the tree.
*/
spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
vdev_dtl_reassess(rvd, 0, 0, B_FALSE);
spa_config_exit(spa, SCL_ALL, FTAG);
/*
* Load the DDTs (dedup tables).
*/
error = ddt_load(spa);
if (error != 0)
return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO));
spa_update_dspace(spa);
/*
* Validate the config, using the MOS config to fill in any
* information which might be missing. If we fail to validate
* the config then declare the pool unfit for use. If we're
* assembling a pool from a split, the log is not transferred
* over.
*/
if (type != SPA_IMPORT_ASSEMBLE) {
nvlist_t *nvconfig;
if (load_nvlist(spa, spa->spa_config_object, &nvconfig) != 0)
return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO));
if (!spa_config_valid(spa, nvconfig)) {
nvlist_free(nvconfig);
return (spa_vdev_err(rvd, VDEV_AUX_BAD_GUID_SUM,
ENXIO));
}
nvlist_free(nvconfig);
/*
* Now that we've validated the config, check the state of the
* root vdev. If it can't be opened, it indicates one or
* more toplevel vdevs are faulted.
*/
if (rvd->vdev_state <= VDEV_STATE_CANT_OPEN)
return (SET_ERROR(ENXIO));
if (spa_check_logs(spa)) {
*ereport = FM_EREPORT_ZFS_LOG_REPLAY;
return (spa_vdev_err(rvd, VDEV_AUX_BAD_LOG, ENXIO));
}
}
if (missing_feat_write) {
ASSERT(state == SPA_LOAD_TRYIMPORT);
/*
* At this point, we know that we can open the pool in
* read-only mode but not read-write mode. We now have enough
* information and can return to userland.
*/
return (spa_vdev_err(rvd, VDEV_AUX_UNSUP_FEAT, ENOTSUP));
}
/*
* We've successfully opened the pool, verify that we're ready
* to start pushing transactions.
*/
if (state != SPA_LOAD_TRYIMPORT) {
if ((error = spa_load_verify(spa)))
return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA,
error));
}
if (spa_writeable(spa) && (state == SPA_LOAD_RECOVER ||
spa->spa_load_max_txg == UINT64_MAX)) {
dmu_tx_t *tx;
int need_update = B_FALSE;
int c;
ASSERT(state != SPA_LOAD_TRYIMPORT);
/*
* Claim log blocks that haven't been committed yet.
* This must all happen in a single txg.
* Note: spa_claim_max_txg is updated by spa_claim_notify(),
* invoked from zil_claim_log_block()'s i/o done callback.
* Price of rollback is that we abandon the log.
*/
spa->spa_claiming = B_TRUE;
tx = dmu_tx_create_assigned(spa_get_dsl(spa),
spa_first_txg(spa));
(void) dmu_objset_find(spa_name(spa),
zil_claim, tx, DS_FIND_CHILDREN);
dmu_tx_commit(tx);
spa->spa_claiming = B_FALSE;
spa_set_log_state(spa, SPA_LOG_GOOD);
spa->spa_sync_on = B_TRUE;
txg_sync_start(spa->spa_dsl_pool);
/*
* Wait for all claims to sync. We sync up to the highest
* claimed log block birth time so that claimed log blocks
* don't appear to be from the future. spa_claim_max_txg
* will have been set for us by either zil_check_log_chain()
* (invoked from spa_check_logs()) or zil_claim() above.
*/
txg_wait_synced(spa->spa_dsl_pool, spa->spa_claim_max_txg);
/*
* If the config cache is stale, or we have uninitialized
* metaslabs (see spa_vdev_add()), then update the config.
*
* If this is a verbatim import, trust the current
* in-core spa_config and update the disk labels.
*/
if (config_cache_txg != spa->spa_config_txg ||
state == SPA_LOAD_IMPORT ||
state == SPA_LOAD_RECOVER ||
(spa->spa_import_flags & ZFS_IMPORT_VERBATIM))
need_update = B_TRUE;
for (c = 0; c < rvd->vdev_children; c++)
if (rvd->vdev_child[c]->vdev_ms_array == 0)
need_update = B_TRUE;
/*
* Update the config cache asychronously in case we're the
* root pool, in which case the config cache isn't writable yet.
*/
if (need_update)
spa_async_request(spa, SPA_ASYNC_CONFIG_UPDATE);
/*
* Check all DTLs to see if anything needs resilvering.
*/
if (!dsl_scan_resilvering(spa->spa_dsl_pool) &&
vdev_resilver_needed(rvd, NULL, NULL))
spa_async_request(spa, SPA_ASYNC_RESILVER);
/*
* Log the fact that we booted up (so that we can detect if
* we rebooted in the middle of an operation).
*/
spa_history_log_version(spa, "open");
/*
* Delete any inconsistent datasets.
*/
(void) dmu_objset_find(spa_name(spa),
dsl_destroy_inconsistent, NULL, DS_FIND_CHILDREN);
/*
* Clean up any stale temporary dataset userrefs.
*/
dsl_pool_clean_tmp_userrefs(spa->spa_dsl_pool);
}
return (0);
}
static int
spa_load_retry(spa_t *spa, spa_load_state_t state, int mosconfig)
{
int mode = spa->spa_mode;
spa_unload(spa);
spa_deactivate(spa);
spa->spa_load_max_txg--;
spa_activate(spa, mode);
spa_async_suspend(spa);
return (spa_load(spa, state, SPA_IMPORT_EXISTING, mosconfig));
}
/*
* If spa_load() fails this function will try loading prior txg's. If
* 'state' is SPA_LOAD_RECOVER and one of these loads succeeds the pool
* will be rewound to that txg. If 'state' is not SPA_LOAD_RECOVER this
* function will not rewind the pool and will return the same error as
* spa_load().
*/
static int
spa_load_best(spa_t *spa, spa_load_state_t state, int mosconfig,
uint64_t max_request, int rewind_flags)
{
nvlist_t *loadinfo = NULL;
nvlist_t *config = NULL;
int load_error, rewind_error;
uint64_t safe_rewind_txg;
uint64_t min_txg;
if (spa->spa_load_txg && state == SPA_LOAD_RECOVER) {
spa->spa_load_max_txg = spa->spa_load_txg;
spa_set_log_state(spa, SPA_LOG_CLEAR);
} else {
spa->spa_load_max_txg = max_request;
}
load_error = rewind_error = spa_load(spa, state, SPA_IMPORT_EXISTING,
mosconfig);
if (load_error == 0)
return (0);
if (spa->spa_root_vdev != NULL)
config = spa_config_generate(spa, NULL, -1ULL, B_TRUE);
spa->spa_last_ubsync_txg = spa->spa_uberblock.ub_txg;
spa->spa_last_ubsync_txg_ts = spa->spa_uberblock.ub_timestamp;
if (rewind_flags & ZPOOL_NEVER_REWIND) {
nvlist_free(config);
return (load_error);
}
if (state == SPA_LOAD_RECOVER) {
/* Price of rolling back is discarding txgs, including log */
spa_set_log_state(spa, SPA_LOG_CLEAR);
} else {
/*
* If we aren't rolling back save the load info from our first
* import attempt so that we can restore it after attempting
* to rewind.
*/
loadinfo = spa->spa_load_info;
spa->spa_load_info = fnvlist_alloc();
}
spa->spa_load_max_txg = spa->spa_last_ubsync_txg;
safe_rewind_txg = spa->spa_last_ubsync_txg - TXG_DEFER_SIZE;
min_txg = (rewind_flags & ZPOOL_EXTREME_REWIND) ?
TXG_INITIAL : safe_rewind_txg;
/*
* Continue as long as we're finding errors, we're still within
* the acceptable rewind range, and we're still finding uberblocks
*/
while (rewind_error && spa->spa_uberblock.ub_txg >= min_txg &&
spa->spa_uberblock.ub_txg <= spa->spa_load_max_txg) {
if (spa->spa_load_max_txg < safe_rewind_txg)
spa->spa_extreme_rewind = B_TRUE;
rewind_error = spa_load_retry(spa, state, mosconfig);
}
spa->spa_extreme_rewind = B_FALSE;
spa->spa_load_max_txg = UINT64_MAX;
if (config && (rewind_error || state != SPA_LOAD_RECOVER))
spa_config_set(spa, config);
if (state == SPA_LOAD_RECOVER) {
ASSERT3P(loadinfo, ==, NULL);
return (rewind_error);
} else {
/* Store the rewind info as part of the initial load info */
fnvlist_add_nvlist(loadinfo, ZPOOL_CONFIG_REWIND_INFO,
spa->spa_load_info);
/* Restore the initial load info */
fnvlist_free(spa->spa_load_info);
spa->spa_load_info = loadinfo;
return (load_error);
}
}
/*
* Pool Open/Import
*
* The import case is identical to an open except that the configuration is sent
* down from userland, instead of grabbed from the configuration cache. For the
* case of an open, the pool configuration will exist in the
* POOL_STATE_UNINITIALIZED state.
*
* The stats information (gen/count/ustats) is used to gather vdev statistics at
* the same time open the pool, without having to keep around the spa_t in some
* ambiguous state.
*/
static int
spa_open_common(const char *pool, spa_t **spapp, void *tag, nvlist_t *nvpolicy,
nvlist_t **config)
{
spa_t *spa;
spa_load_state_t state = SPA_LOAD_OPEN;
int error;
int locked = B_FALSE;
int firstopen = B_FALSE;
*spapp = NULL;
/*
* As disgusting as this is, we need to support recursive calls to this
* function because dsl_dir_open() is called during spa_load(), and ends
* up calling spa_open() again. The real fix is to figure out how to
* avoid dsl_dir_open() calling this in the first place.
*/
if (mutex_owner(&spa_namespace_lock) != curthread) {
mutex_enter(&spa_namespace_lock);
locked = B_TRUE;
}
if ((spa = spa_lookup(pool)) == NULL) {
if (locked)
mutex_exit(&spa_namespace_lock);
return (SET_ERROR(ENOENT));
}
if (spa->spa_state == POOL_STATE_UNINITIALIZED) {
zpool_rewind_policy_t policy;
firstopen = B_TRUE;
zpool_get_rewind_policy(nvpolicy ? nvpolicy : spa->spa_config,
&policy);
if (policy.zrp_request & ZPOOL_DO_REWIND)
state = SPA_LOAD_RECOVER;
spa_activate(spa, spa_mode_global);
if (state != SPA_LOAD_RECOVER)
spa->spa_last_ubsync_txg = spa->spa_load_txg = 0;
error = spa_load_best(spa, state, B_FALSE, policy.zrp_txg,
policy.zrp_request);
if (error == EBADF) {
/*
* If vdev_validate() returns failure (indicated by
* EBADF), it indicates that one of the vdevs indicates
* that the pool has been exported or destroyed. If
* this is the case, the config cache is out of sync and
* we should remove the pool from the namespace.
*/
spa_unload(spa);
spa_deactivate(spa);
spa_config_sync(spa, B_TRUE, B_TRUE);
spa_remove(spa);
if (locked)
mutex_exit(&spa_namespace_lock);
return (SET_ERROR(ENOENT));
}
if (error) {
/*
* We can't open the pool, but we still have useful
* information: the state of each vdev after the
* attempted vdev_open(). Return this to the user.
*/
if (config != NULL && spa->spa_config) {
VERIFY(nvlist_dup(spa->spa_config, config,
KM_PUSHPAGE) == 0);
VERIFY(nvlist_add_nvlist(*config,
ZPOOL_CONFIG_LOAD_INFO,
spa->spa_load_info) == 0);
}
spa_unload(spa);
spa_deactivate(spa);
spa->spa_last_open_failed = error;
if (locked)
mutex_exit(&spa_namespace_lock);
*spapp = NULL;
return (error);
}
}
spa_open_ref(spa, tag);
if (config != NULL)
*config = spa_config_generate(spa, NULL, -1ULL, B_TRUE);
/*
* If we've recovered the pool, pass back any information we
* gathered while doing the load.
*/
if (state == SPA_LOAD_RECOVER) {
VERIFY(nvlist_add_nvlist(*config, ZPOOL_CONFIG_LOAD_INFO,
spa->spa_load_info) == 0);
}
if (locked) {
spa->spa_last_open_failed = 0;
spa->spa_last_ubsync_txg = 0;
spa->spa_load_txg = 0;
mutex_exit(&spa_namespace_lock);
}
#ifdef _KERNEL
if (firstopen)
zvol_create_minors(spa->spa_name);
#endif
*spapp = spa;
return (0);
}
int
spa_open_rewind(const char *name, spa_t **spapp, void *tag, nvlist_t *policy,
nvlist_t **config)
{
return (spa_open_common(name, spapp, tag, policy, config));
}
int
spa_open(const char *name, spa_t **spapp, void *tag)
{
return (spa_open_common(name, spapp, tag, NULL, NULL));
}
/*
* Lookup the given spa_t, incrementing the inject count in the process,
* preventing it from being exported or destroyed.
*/
spa_t *
spa_inject_addref(char *name)
{
spa_t *spa;
mutex_enter(&spa_namespace_lock);
if ((spa = spa_lookup(name)) == NULL) {
mutex_exit(&spa_namespace_lock);
return (NULL);
}
spa->spa_inject_ref++;
mutex_exit(&spa_namespace_lock);
return (spa);
}
void
spa_inject_delref(spa_t *spa)
{
mutex_enter(&spa_namespace_lock);
spa->spa_inject_ref--;
mutex_exit(&spa_namespace_lock);
}
/*
* Add spares device information to the nvlist.
*/
static void
spa_add_spares(spa_t *spa, nvlist_t *config)
{
nvlist_t **spares;
uint_t i, nspares;
nvlist_t *nvroot;
uint64_t guid;
vdev_stat_t *vs;
uint_t vsc;
uint64_t pool;
ASSERT(spa_config_held(spa, SCL_CONFIG, RW_READER));
if (spa->spa_spares.sav_count == 0)
return;
VERIFY(nvlist_lookup_nvlist(config,
ZPOOL_CONFIG_VDEV_TREE, &nvroot) == 0);
VERIFY(nvlist_lookup_nvlist_array(spa->spa_spares.sav_config,
ZPOOL_CONFIG_SPARES, &spares, &nspares) == 0);
if (nspares != 0) {
VERIFY(nvlist_add_nvlist_array(nvroot,
ZPOOL_CONFIG_SPARES, spares, nspares) == 0);
VERIFY(nvlist_lookup_nvlist_array(nvroot,
ZPOOL_CONFIG_SPARES, &spares, &nspares) == 0);
/*
* Go through and find any spares which have since been
* repurposed as an active spare. If this is the case, update
* their status appropriately.
*/
for (i = 0; i < nspares; i++) {
VERIFY(nvlist_lookup_uint64(spares[i],
ZPOOL_CONFIG_GUID, &guid) == 0);
if (spa_spare_exists(guid, &pool, NULL) &&
pool != 0ULL) {
VERIFY(nvlist_lookup_uint64_array(
spares[i], ZPOOL_CONFIG_VDEV_STATS,
(uint64_t **)&vs, &vsc) == 0);
vs->vs_state = VDEV_STATE_CANT_OPEN;
vs->vs_aux = VDEV_AUX_SPARED;
}
}
}
}
/*
* Add l2cache device information to the nvlist, including vdev stats.
*/
static void
spa_add_l2cache(spa_t *spa, nvlist_t *config)
{
nvlist_t **l2cache;
uint_t i, j, nl2cache;
nvlist_t *nvroot;
uint64_t guid;
vdev_t *vd;
vdev_stat_t *vs;
uint_t vsc;
ASSERT(spa_config_held(spa, SCL_CONFIG, RW_READER));
if (spa->spa_l2cache.sav_count == 0)
return;
VERIFY(nvlist_lookup_nvlist(config,
ZPOOL_CONFIG_VDEV_TREE, &nvroot) == 0);
VERIFY(nvlist_lookup_nvlist_array(spa->spa_l2cache.sav_config,
ZPOOL_CONFIG_L2CACHE, &l2cache, &nl2cache) == 0);
if (nl2cache != 0) {
VERIFY(nvlist_add_nvlist_array(nvroot,
ZPOOL_CONFIG_L2CACHE, l2cache, nl2cache) == 0);
VERIFY(nvlist_lookup_nvlist_array(nvroot,
ZPOOL_CONFIG_L2CACHE, &l2cache, &nl2cache) == 0);
/*
* Update level 2 cache device stats.
*/
for (i = 0; i < nl2cache; i++) {
VERIFY(nvlist_lookup_uint64(l2cache[i],
ZPOOL_CONFIG_GUID, &guid) == 0);
vd = NULL;
for (j = 0; j < spa->spa_l2cache.sav_count; j++) {
if (guid ==
spa->spa_l2cache.sav_vdevs[j]->vdev_guid) {
vd = spa->spa_l2cache.sav_vdevs[j];
break;
}
}
ASSERT(vd != NULL);
VERIFY(nvlist_lookup_uint64_array(l2cache[i],
ZPOOL_CONFIG_VDEV_STATS, (uint64_t **)&vs, &vsc)
== 0);
vdev_get_stats(vd, vs);
}
}
}
static void
spa_add_feature_stats(spa_t *spa, nvlist_t *config)
{
nvlist_t *features;
zap_cursor_t zc;
zap_attribute_t za;
ASSERT(spa_config_held(spa, SCL_CONFIG, RW_READER));
VERIFY(nvlist_alloc(&features, NV_UNIQUE_NAME, KM_SLEEP) == 0);
if (spa->spa_feat_for_read_obj != 0) {
for (zap_cursor_init(&zc, spa->spa_meta_objset,
spa->spa_feat_for_read_obj);
zap_cursor_retrieve(&zc, &za) == 0;
zap_cursor_advance(&zc)) {
ASSERT(za.za_integer_length == sizeof (uint64_t) &&
za.za_num_integers == 1);
VERIFY3U(0, ==, nvlist_add_uint64(features, za.za_name,
za.za_first_integer));
}
zap_cursor_fini(&zc);
}
if (spa->spa_feat_for_write_obj != 0) {
for (zap_cursor_init(&zc, spa->spa_meta_objset,
spa->spa_feat_for_write_obj);
zap_cursor_retrieve(&zc, &za) == 0;
zap_cursor_advance(&zc)) {
ASSERT(za.za_integer_length == sizeof (uint64_t) &&
za.za_num_integers == 1);
VERIFY3U(0, ==, nvlist_add_uint64(features, za.za_name,
za.za_first_integer));
}
zap_cursor_fini(&zc);
}
VERIFY(nvlist_add_nvlist(config, ZPOOL_CONFIG_FEATURE_STATS,
features) == 0);
nvlist_free(features);
}
int
spa_get_stats(const char *name, nvlist_t **config,
char *altroot, size_t buflen)
{
int error;
spa_t *spa;
*config = NULL;
error = spa_open_common(name, &spa, FTAG, NULL, config);
if (spa != NULL) {
/*
* This still leaves a window of inconsistency where the spares
* or l2cache devices could change and the config would be
* self-inconsistent.
*/
spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER);
if (*config != NULL) {
uint64_t loadtimes[2];
loadtimes[0] = spa->spa_loaded_ts.tv_sec;
loadtimes[1] = spa->spa_loaded_ts.tv_nsec;
VERIFY(nvlist_add_uint64_array(*config,
ZPOOL_CONFIG_LOADED_TIME, loadtimes, 2) == 0);
VERIFY(nvlist_add_uint64(*config,
ZPOOL_CONFIG_ERRCOUNT,
spa_get_errlog_size(spa)) == 0);
if (spa_suspended(spa))
VERIFY(nvlist_add_uint64(*config,
ZPOOL_CONFIG_SUSPENDED,
spa->spa_failmode) == 0);
spa_add_spares(spa, *config);
spa_add_l2cache(spa, *config);
spa_add_feature_stats(spa, *config);
}
}
/*
* We want to get the alternate root even for faulted pools, so we cheat
* and call spa_lookup() directly.
*/
if (altroot) {
if (spa == NULL) {
mutex_enter(&spa_namespace_lock);
spa = spa_lookup(name);
if (spa)
spa_altroot(spa, altroot, buflen);
else
altroot[0] = '\0';
spa = NULL;
mutex_exit(&spa_namespace_lock);
} else {
spa_altroot(spa, altroot, buflen);
}
}
if (spa != NULL) {
spa_config_exit(spa, SCL_CONFIG, FTAG);
spa_close(spa, FTAG);
}
return (error);
}
/*
* Validate that the auxiliary device array is well formed. We must have an
* array of nvlists, each which describes a valid leaf vdev. If this is an
* import (mode is VDEV_ALLOC_SPARE), then we allow corrupted spares to be
* specified, as long as they are well-formed.
*/
static int
spa_validate_aux_devs(spa_t *spa, nvlist_t *nvroot, uint64_t crtxg, int mode,
spa_aux_vdev_t *sav, const char *config, uint64_t version,
vdev_labeltype_t label)
{
nvlist_t **dev;
uint_t i, ndev;
vdev_t *vd;
int error;
ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL);
/*
* It's acceptable to have no devs specified.
*/
if (nvlist_lookup_nvlist_array(nvroot, config, &dev, &ndev) != 0)
return (0);
if (ndev == 0)
return (SET_ERROR(EINVAL));
/*
* Make sure the pool is formatted with a version that supports this
* device type.
*/
if (spa_version(spa) < version)
return (SET_ERROR(ENOTSUP));
/*
* Set the pending device list so we correctly handle device in-use
* checking.
*/
sav->sav_pending = dev;
sav->sav_npending = ndev;
for (i = 0; i < ndev; i++) {
if ((error = spa_config_parse(spa, &vd, dev[i], NULL, 0,
mode)) != 0)
goto out;
if (!vd->vdev_ops->vdev_op_leaf) {
vdev_free(vd);
error = SET_ERROR(EINVAL);
goto out;
}
/*
* The L2ARC currently only supports disk devices in
* kernel context. For user-level testing, we allow it.
*/
#ifdef _KERNEL
if ((strcmp(config, ZPOOL_CONFIG_L2CACHE) == 0) &&
strcmp(vd->vdev_ops->vdev_op_type, VDEV_TYPE_DISK) != 0) {
error = SET_ERROR(ENOTBLK);
vdev_free(vd);
goto out;
}
#endif
vd->vdev_top = vd;
if ((error = vdev_open(vd)) == 0 &&
(error = vdev_label_init(vd, crtxg, label)) == 0) {
VERIFY(nvlist_add_uint64(dev[i], ZPOOL_CONFIG_GUID,
vd->vdev_guid) == 0);
}
vdev_free(vd);
if (error &&
(mode != VDEV_ALLOC_SPARE && mode != VDEV_ALLOC_L2CACHE))
goto out;
else
error = 0;
}
out:
sav->sav_pending = NULL;
sav->sav_npending = 0;
return (error);
}
static int
spa_validate_aux(spa_t *spa, nvlist_t *nvroot, uint64_t crtxg, int mode)
{
int error;
ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL);
if ((error = spa_validate_aux_devs(spa, nvroot, crtxg, mode,
&spa->spa_spares, ZPOOL_CONFIG_SPARES, SPA_VERSION_SPARES,
VDEV_LABEL_SPARE)) != 0) {
return (error);
}
return (spa_validate_aux_devs(spa, nvroot, crtxg, mode,
&spa->spa_l2cache, ZPOOL_CONFIG_L2CACHE, SPA_VERSION_L2CACHE,
VDEV_LABEL_L2CACHE));
}
static void
spa_set_aux_vdevs(spa_aux_vdev_t *sav, nvlist_t **devs, int ndevs,
const char *config)
{
int i;
if (sav->sav_config != NULL) {
nvlist_t **olddevs;
uint_t oldndevs;
nvlist_t **newdevs;
/*
* Generate new dev list by concatentating with the
* current dev list.
*/
VERIFY(nvlist_lookup_nvlist_array(sav->sav_config, config,
&olddevs, &oldndevs) == 0);
newdevs = kmem_alloc(sizeof (void *) *
(ndevs + oldndevs), KM_PUSHPAGE);
for (i = 0; i < oldndevs; i++)
VERIFY(nvlist_dup(olddevs[i], &newdevs[i],
KM_PUSHPAGE) == 0);
for (i = 0; i < ndevs; i++)
VERIFY(nvlist_dup(devs[i], &newdevs[i + oldndevs],
KM_PUSHPAGE) == 0);
VERIFY(nvlist_remove(sav->sav_config, config,
DATA_TYPE_NVLIST_ARRAY) == 0);
VERIFY(nvlist_add_nvlist_array(sav->sav_config,
config, newdevs, ndevs + oldndevs) == 0);
for (i = 0; i < oldndevs + ndevs; i++)
nvlist_free(newdevs[i]);
kmem_free(newdevs, (oldndevs + ndevs) * sizeof (void *));
} else {
/*
* Generate a new dev list.
*/
VERIFY(nvlist_alloc(&sav->sav_config, NV_UNIQUE_NAME,
KM_PUSHPAGE) == 0);
VERIFY(nvlist_add_nvlist_array(sav->sav_config, config,
devs, ndevs) == 0);
}
}
/*
* Stop and drop level 2 ARC devices
*/
void
spa_l2cache_drop(spa_t *spa)
{
vdev_t *vd;
int i;
spa_aux_vdev_t *sav = &spa->spa_l2cache;
for (i = 0; i < sav->sav_count; i++) {
uint64_t pool;
vd = sav->sav_vdevs[i];
ASSERT(vd != NULL);
if (spa_l2cache_exists(vd->vdev_guid, &pool) &&
pool != 0ULL && l2arc_vdev_present(vd))
l2arc_remove_vdev(vd);
}
}
/*
* Pool Creation
*/
int
spa_create(const char *pool, nvlist_t *nvroot, nvlist_t *props,
nvlist_t *zplprops)
{
spa_t *spa;
char *altroot = NULL;
vdev_t *rvd;
dsl_pool_t *dp;
dmu_tx_t *tx;
int error = 0;
uint64_t txg = TXG_INITIAL;
nvlist_t **spares, **l2cache;
uint_t nspares, nl2cache;
uint64_t version, obj;
boolean_t has_features;
nvpair_t *elem;
int c;
/*
* If this pool already exists, return failure.
*/
mutex_enter(&spa_namespace_lock);
if (spa_lookup(pool) != NULL) {
mutex_exit(&spa_namespace_lock);
return (SET_ERROR(EEXIST));
}
/*
* Allocate a new spa_t structure.
*/
(void) nvlist_lookup_string(props,
zpool_prop_to_name(ZPOOL_PROP_ALTROOT), &altroot);
spa = spa_add(pool, NULL, altroot);
spa_activate(spa, spa_mode_global);
if (props && (error = spa_prop_validate(spa, props))) {
spa_deactivate(spa);
spa_remove(spa);
mutex_exit(&spa_namespace_lock);
return (error);
}
has_features = B_FALSE;
for (elem = nvlist_next_nvpair(props, NULL);
elem != NULL; elem = nvlist_next_nvpair(props, elem)) {
if (zpool_prop_feature(nvpair_name(elem)))
has_features = B_TRUE;
}
if (has_features || nvlist_lookup_uint64(props,
zpool_prop_to_name(ZPOOL_PROP_VERSION), &version) != 0) {
version = SPA_VERSION;
}
ASSERT(SPA_VERSION_IS_SUPPORTED(version));
spa->spa_first_txg = txg;
spa->spa_uberblock.ub_txg = txg - 1;
spa->spa_uberblock.ub_version = version;
spa->spa_ubsync = spa->spa_uberblock;
/*
* Create "The Godfather" zio to hold all async IOs
*/
spa->spa_async_zio_root = zio_root(spa, NULL, NULL,
ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE | ZIO_FLAG_GODFATHER);
/*
* Create the root vdev.
*/
spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
error = spa_config_parse(spa, &rvd, nvroot, NULL, 0, VDEV_ALLOC_ADD);
ASSERT(error != 0 || rvd != NULL);
ASSERT(error != 0 || spa->spa_root_vdev == rvd);
if (error == 0 && !zfs_allocatable_devs(nvroot))
error = SET_ERROR(EINVAL);
if (error == 0 &&
(error = vdev_create(rvd, txg, B_FALSE)) == 0 &&
(error = spa_validate_aux(spa, nvroot, txg,
VDEV_ALLOC_ADD)) == 0) {
for (c = 0; c < rvd->vdev_children; c++) {
vdev_metaslab_set_size(rvd->vdev_child[c]);
vdev_expand(rvd->vdev_child[c], txg);
}
}
spa_config_exit(spa, SCL_ALL, FTAG);
if (error != 0) {
spa_unload(spa);
spa_deactivate(spa);
spa_remove(spa);
mutex_exit(&spa_namespace_lock);
return (error);
}
/*
* Get the list of spares, if specified.
*/
if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_SPARES,
&spares, &nspares) == 0) {
VERIFY(nvlist_alloc(&spa->spa_spares.sav_config, NV_UNIQUE_NAME,
KM_PUSHPAGE) == 0);
VERIFY(nvlist_add_nvlist_array(spa->spa_spares.sav_config,
ZPOOL_CONFIG_SPARES, spares, nspares) == 0);
spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
spa_load_spares(spa);
spa_config_exit(spa, SCL_ALL, FTAG);
spa->spa_spares.sav_sync = B_TRUE;
}
/*
* Get the list of level 2 cache devices, if specified.
*/
if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_L2CACHE,
&l2cache, &nl2cache) == 0) {
VERIFY(nvlist_alloc(&spa->spa_l2cache.sav_config,
NV_UNIQUE_NAME, KM_PUSHPAGE) == 0);
VERIFY(nvlist_add_nvlist_array(spa->spa_l2cache.sav_config,
ZPOOL_CONFIG_L2CACHE, l2cache, nl2cache) == 0);
spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
spa_load_l2cache(spa);
spa_config_exit(spa, SCL_ALL, FTAG);
spa->spa_l2cache.sav_sync = B_TRUE;
}
spa->spa_is_initializing = B_TRUE;
spa->spa_dsl_pool = dp = dsl_pool_create(spa, zplprops, txg);
spa->spa_meta_objset = dp->dp_meta_objset;
spa->spa_is_initializing = B_FALSE;
/*
* Create DDTs (dedup tables).
*/
ddt_create(spa);
spa_update_dspace(spa);
tx = dmu_tx_create_assigned(dp, txg);
/*
* Create the pool config object.
*/
spa->spa_config_object = dmu_object_alloc(spa->spa_meta_objset,
DMU_OT_PACKED_NVLIST, SPA_CONFIG_BLOCKSIZE,
DMU_OT_PACKED_NVLIST_SIZE, sizeof (uint64_t), tx);
if (zap_add(spa->spa_meta_objset,
DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_CONFIG,
sizeof (uint64_t), 1, &spa->spa_config_object, tx) != 0) {
cmn_err(CE_PANIC, "failed to add pool config");
}
if (spa_version(spa) >= SPA_VERSION_FEATURES)
spa_feature_create_zap_objects(spa, tx);
if (zap_add(spa->spa_meta_objset,
DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_CREATION_VERSION,
sizeof (uint64_t), 1, &version, tx) != 0) {
cmn_err(CE_PANIC, "failed to add pool version");
}
/* Newly created pools with the right version are always deflated. */
if (version >= SPA_VERSION_RAIDZ_DEFLATE) {
spa->spa_deflate = TRUE;
if (zap_add(spa->spa_meta_objset,
DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_DEFLATE,
sizeof (uint64_t), 1, &spa->spa_deflate, tx) != 0) {
cmn_err(CE_PANIC, "failed to add deflate");
}
}
/*
* Create the deferred-free bpobj. Turn off compression
* because sync-to-convergence takes longer if the blocksize
* keeps changing.
*/
obj = bpobj_alloc(spa->spa_meta_objset, 1 << 14, tx);
dmu_object_set_compress(spa->spa_meta_objset, obj,
ZIO_COMPRESS_OFF, tx);
if (zap_add(spa->spa_meta_objset,
DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_SYNC_BPOBJ,
sizeof (uint64_t), 1, &obj, tx) != 0) {
cmn_err(CE_PANIC, "failed to add bpobj");
}
VERIFY3U(0, ==, bpobj_open(&spa->spa_deferred_bpobj,
spa->spa_meta_objset, obj));
/*
* Create the pool's history object.
*/
if (version >= SPA_VERSION_ZPOOL_HISTORY)
spa_history_create_obj(spa, tx);
/*
* Set pool properties.
*/
spa->spa_bootfs = zpool_prop_default_numeric(ZPOOL_PROP_BOOTFS);
spa->spa_delegation = zpool_prop_default_numeric(ZPOOL_PROP_DELEGATION);
spa->spa_failmode = zpool_prop_default_numeric(ZPOOL_PROP_FAILUREMODE);
spa->spa_autoexpand = zpool_prop_default_numeric(ZPOOL_PROP_AUTOEXPAND);
if (props != NULL) {
spa_configfile_set(spa, props, B_FALSE);
spa_sync_props(props, tx);
}
dmu_tx_commit(tx);
spa->spa_sync_on = B_TRUE;
txg_sync_start(spa->spa_dsl_pool);
/*
* We explicitly wait for the first transaction to complete so that our
* bean counters are appropriately updated.
*/
txg_wait_synced(spa->spa_dsl_pool, txg);
spa_config_sync(spa, B_FALSE, B_TRUE);
spa_history_log_version(spa, "create");
spa->spa_minref = refcount_count(&spa->spa_refcount);
mutex_exit(&spa_namespace_lock);
return (0);
}
#ifdef _KERNEL
/*
* Get the root pool information from the root disk, then import the root pool
* during the system boot up time.
*/
extern int vdev_disk_read_rootlabel(char *, char *, nvlist_t **);
static nvlist_t *
spa_generate_rootconf(char *devpath, char *devid, uint64_t *guid)
{
nvlist_t *config;
nvlist_t *nvtop, *nvroot;
uint64_t pgid;
if (vdev_disk_read_rootlabel(devpath, devid, &config) != 0)
return (NULL);
/*
* Add this top-level vdev to the child array.
*/
VERIFY(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE,
&nvtop) == 0);
VERIFY(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID,
&pgid) == 0);
VERIFY(nvlist_lookup_uint64(config, ZPOOL_CONFIG_GUID, guid) == 0);
/*
* Put this pool's top-level vdevs into a root vdev.
*/
VERIFY(nvlist_alloc(&nvroot, NV_UNIQUE_NAME, KM_PUSHPAGE) == 0);
VERIFY(nvlist_add_string(nvroot, ZPOOL_CONFIG_TYPE,
VDEV_TYPE_ROOT) == 0);
VERIFY(nvlist_add_uint64(nvroot, ZPOOL_CONFIG_ID, 0ULL) == 0);
VERIFY(nvlist_add_uint64(nvroot, ZPOOL_CONFIG_GUID, pgid) == 0);
VERIFY(nvlist_add_nvlist_array(nvroot, ZPOOL_CONFIG_CHILDREN,
&nvtop, 1) == 0);
/*
* Replace the existing vdev_tree with the new root vdev in
* this pool's configuration (remove the old, add the new).
*/
VERIFY(nvlist_add_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, nvroot) == 0);
nvlist_free(nvroot);
return (config);
}
/*
* Walk the vdev tree and see if we can find a device with "better"
* configuration. A configuration is "better" if the label on that
* device has a more recent txg.
*/
static void
spa_alt_rootvdev(vdev_t *vd, vdev_t **avd, uint64_t *txg)
{
int c;
for (c = 0; c < vd->vdev_children; c++)
spa_alt_rootvdev(vd->vdev_child[c], avd, txg);
if (vd->vdev_ops->vdev_op_leaf) {
nvlist_t *label;
uint64_t label_txg;
if (vdev_disk_read_rootlabel(vd->vdev_physpath, vd->vdev_devid,
&label) != 0)
return;
VERIFY(nvlist_lookup_uint64(label, ZPOOL_CONFIG_POOL_TXG,
&label_txg) == 0);
/*
* Do we have a better boot device?
*/
if (label_txg > *txg) {
*txg = label_txg;
*avd = vd;
}
nvlist_free(label);
}
}
/*
* Import a root pool.
*
* For x86. devpath_list will consist of devid and/or physpath name of
* the vdev (e.g. "id1,sd@SSEAGATE..." or "/pci@1f,0/ide@d/disk@0,0:a").
* The GRUB "findroot" command will return the vdev we should boot.
*
* For Sparc, devpath_list consists the physpath name of the booting device
* no matter the rootpool is a single device pool or a mirrored pool.
* e.g.
* "/pci@1f,0/ide@d/disk@0,0:a"
*/
int
spa_import_rootpool(char *devpath, char *devid)
{
spa_t *spa;
vdev_t *rvd, *bvd, *avd = NULL;
nvlist_t *config, *nvtop;
uint64_t guid, txg;
char *pname;
int error;
/*
* Read the label from the boot device and generate a configuration.
*/
config = spa_generate_rootconf(devpath, devid, &guid);
#if defined(_OBP) && defined(_KERNEL)
if (config == NULL) {
if (strstr(devpath, "/iscsi/ssd") != NULL) {
/* iscsi boot */
get_iscsi_bootpath_phy(devpath);
config = spa_generate_rootconf(devpath, devid, &guid);
}
}
#endif
if (config == NULL) {
cmn_err(CE_NOTE, "Cannot read the pool label from '%s'",
devpath);
return (SET_ERROR(EIO));
}
VERIFY(nvlist_lookup_string(config, ZPOOL_CONFIG_POOL_NAME,
&pname) == 0);
VERIFY(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_TXG, &txg) == 0);
mutex_enter(&spa_namespace_lock);
if ((spa = spa_lookup(pname)) != NULL) {
/*
* Remove the existing root pool from the namespace so that we
* can replace it with the correct config we just read in.
*/
spa_remove(spa);
}
spa = spa_add(pname, config, NULL);
spa->spa_is_root = B_TRUE;
spa->spa_import_flags = ZFS_IMPORT_VERBATIM;
/*
* Build up a vdev tree based on the boot device's label config.
*/
VERIFY(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE,
&nvtop) == 0);
spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
error = spa_config_parse(spa, &rvd, nvtop, NULL, 0,
VDEV_ALLOC_ROOTPOOL);
spa_config_exit(spa, SCL_ALL, FTAG);
if (error) {
mutex_exit(&spa_namespace_lock);
nvlist_free(config);
cmn_err(CE_NOTE, "Can not parse the config for pool '%s'",
pname);
return (error);
}
/*
* Get the boot vdev.
*/
if ((bvd = vdev_lookup_by_guid(rvd, guid)) == NULL) {
cmn_err(CE_NOTE, "Can not find the boot vdev for guid %llu",
(u_longlong_t)guid);
error = SET_ERROR(ENOENT);
goto out;
}
/*
* Determine if there is a better boot device.
*/
avd = bvd;
spa_alt_rootvdev(rvd, &avd, &txg);
if (avd != bvd) {
cmn_err(CE_NOTE, "The boot device is 'degraded'. Please "
"try booting from '%s'", avd->vdev_path);
error = SET_ERROR(EINVAL);
goto out;
}
/*
* If the boot device is part of a spare vdev then ensure that
* we're booting off the active spare.
*/
if (bvd->vdev_parent->vdev_ops == &vdev_spare_ops &&
!bvd->vdev_isspare) {
cmn_err(CE_NOTE, "The boot device is currently spared. Please "
"try booting from '%s'",
bvd->vdev_parent->
vdev_child[bvd->vdev_parent->vdev_children - 1]->vdev_path);
error = SET_ERROR(EINVAL);
goto out;
}
error = 0;
out:
spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
vdev_free(rvd);
spa_config_exit(spa, SCL_ALL, FTAG);
mutex_exit(&spa_namespace_lock);
nvlist_free(config);
return (error);
}
#endif
/*
* Import a non-root pool into the system.
*/
int
spa_import(char *pool, nvlist_t *config, nvlist_t *props, uint64_t flags)
{
spa_t *spa;
char *altroot = NULL;
spa_load_state_t state = SPA_LOAD_IMPORT;
zpool_rewind_policy_t policy;
uint64_t mode = spa_mode_global;
uint64_t readonly = B_FALSE;
int error;
nvlist_t *nvroot;
nvlist_t **spares, **l2cache;
uint_t nspares, nl2cache;
/*
* If a pool with this name exists, return failure.
*/
mutex_enter(&spa_namespace_lock);
if (spa_lookup(pool) != NULL) {
mutex_exit(&spa_namespace_lock);
return (SET_ERROR(EEXIST));
}
/*
* Create and initialize the spa structure.
*/
(void) nvlist_lookup_string(props,
zpool_prop_to_name(ZPOOL_PROP_ALTROOT), &altroot);
(void) nvlist_lookup_uint64(props,
zpool_prop_to_name(ZPOOL_PROP_READONLY), &readonly);
if (readonly)
mode = FREAD;
spa = spa_add(pool, config, altroot);
spa->spa_import_flags = flags;
/*
* Verbatim import - Take a pool and insert it into the namespace
* as if it had been loaded at boot.
*/
if (spa->spa_import_flags & ZFS_IMPORT_VERBATIM) {
if (props != NULL)
spa_configfile_set(spa, props, B_FALSE);
spa_config_sync(spa, B_FALSE, B_TRUE);
mutex_exit(&spa_namespace_lock);
spa_history_log_version(spa, "import");
return (0);
}
spa_activate(spa, mode);
/*
* Don't start async tasks until we know everything is healthy.
*/
spa_async_suspend(spa);
zpool_get_rewind_policy(config, &policy);
if (policy.zrp_request & ZPOOL_DO_REWIND)
state = SPA_LOAD_RECOVER;
/*
* Pass off the heavy lifting to spa_load(). Pass TRUE for mosconfig
* because the user-supplied config is actually the one to trust when
* doing an import.
*/
if (state != SPA_LOAD_RECOVER)
spa->spa_last_ubsync_txg = spa->spa_load_txg = 0;
error = spa_load_best(spa, state, B_TRUE, policy.zrp_txg,
policy.zrp_request);
/*
* Propagate anything learned while loading the pool and pass it
* back to caller (i.e. rewind info, missing devices, etc).
*/
VERIFY(nvlist_add_nvlist(config, ZPOOL_CONFIG_LOAD_INFO,
spa->spa_load_info) == 0);
spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
/*
* Toss any existing sparelist, as it doesn't have any validity
* anymore, and conflicts with spa_has_spare().
*/
if (spa->spa_spares.sav_config) {
nvlist_free(spa->spa_spares.sav_config);
spa->spa_spares.sav_config = NULL;
spa_load_spares(spa);
}
if (spa->spa_l2cache.sav_config) {
nvlist_free(spa->spa_l2cache.sav_config);
spa->spa_l2cache.sav_config = NULL;
spa_load_l2cache(spa);
}
VERIFY(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE,
&nvroot) == 0);
if (error == 0)
error = spa_validate_aux(spa, nvroot, -1ULL,
VDEV_ALLOC_SPARE);
if (error == 0)
error = spa_validate_aux(spa, nvroot, -1ULL,
VDEV_ALLOC_L2CACHE);
spa_config_exit(spa, SCL_ALL, FTAG);
if (props != NULL)
spa_configfile_set(spa, props, B_FALSE);
if (error != 0 || (props && spa_writeable(spa) &&
(error = spa_prop_set(spa, props)))) {
spa_unload(spa);
spa_deactivate(spa);
spa_remove(spa);
mutex_exit(&spa_namespace_lock);
return (error);
}
spa_async_resume(spa);
/*
* Override any spares and level 2 cache devices as specified by
* the user, as these may have correct device names/devids, etc.
*/
if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_SPARES,
&spares, &nspares) == 0) {
if (spa->spa_spares.sav_config)
VERIFY(nvlist_remove(spa->spa_spares.sav_config,
ZPOOL_CONFIG_SPARES, DATA_TYPE_NVLIST_ARRAY) == 0);
else
VERIFY(nvlist_alloc(&spa->spa_spares.sav_config,
NV_UNIQUE_NAME, KM_PUSHPAGE) == 0);
VERIFY(nvlist_add_nvlist_array(spa->spa_spares.sav_config,
ZPOOL_CONFIG_SPARES, spares, nspares) == 0);
spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
spa_load_spares(spa);
spa_config_exit(spa, SCL_ALL, FTAG);
spa->spa_spares.sav_sync = B_TRUE;
}
if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_L2CACHE,
&l2cache, &nl2cache) == 0) {
if (spa->spa_l2cache.sav_config)
VERIFY(nvlist_remove(spa->spa_l2cache.sav_config,
ZPOOL_CONFIG_L2CACHE, DATA_TYPE_NVLIST_ARRAY) == 0);
else
VERIFY(nvlist_alloc(&spa->spa_l2cache.sav_config,
NV_UNIQUE_NAME, KM_PUSHPAGE) == 0);
VERIFY(nvlist_add_nvlist_array(spa->spa_l2cache.sav_config,
ZPOOL_CONFIG_L2CACHE, l2cache, nl2cache) == 0);
spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
spa_load_l2cache(spa);
spa_config_exit(spa, SCL_ALL, FTAG);
spa->spa_l2cache.sav_sync = B_TRUE;
}
/*
* Check for any removed devices.
*/
if (spa->spa_autoreplace) {
spa_aux_check_removed(&spa->spa_spares);
spa_aux_check_removed(&spa->spa_l2cache);
}
if (spa_writeable(spa)) {
/*
* Update the config cache to include the newly-imported pool.
*/
spa_config_update(spa, SPA_CONFIG_UPDATE_POOL);
}
/*
* It's possible that the pool was expanded while it was exported.
* We kick off an async task to handle this for us.
*/
spa_async_request(spa, SPA_ASYNC_AUTOEXPAND);
mutex_exit(&spa_namespace_lock);
spa_history_log_version(spa, "import");
#ifdef _KERNEL
zvol_create_minors(pool);
#endif
return (0);
}
nvlist_t *
spa_tryimport(nvlist_t *tryconfig)
{
nvlist_t *config = NULL;
char *poolname;
spa_t *spa;
uint64_t state;
int error;
if (nvlist_lookup_string(tryconfig, ZPOOL_CONFIG_POOL_NAME, &poolname))
return (NULL);
if (nvlist_lookup_uint64(tryconfig, ZPOOL_CONFIG_POOL_STATE, &state))
return (NULL);
/*
* Create and initialize the spa structure.
*/
mutex_enter(&spa_namespace_lock);
spa = spa_add(TRYIMPORT_NAME, tryconfig, NULL);
spa_activate(spa, FREAD);
/*
* Pass off the heavy lifting to spa_load().
* Pass TRUE for mosconfig because the user-supplied config
* is actually the one to trust when doing an import.
*/
error = spa_load(spa, SPA_LOAD_TRYIMPORT, SPA_IMPORT_EXISTING, B_TRUE);
/*
* If 'tryconfig' was at least parsable, return the current config.
*/
if (spa->spa_root_vdev != NULL) {
config = spa_config_generate(spa, NULL, -1ULL, B_TRUE);
VERIFY(nvlist_add_string(config, ZPOOL_CONFIG_POOL_NAME,
poolname) == 0);
VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_POOL_STATE,
state) == 0);
VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_TIMESTAMP,
spa->spa_uberblock.ub_timestamp) == 0);
VERIFY(nvlist_add_nvlist(config, ZPOOL_CONFIG_LOAD_INFO,
spa->spa_load_info) == 0);
/*
* If the bootfs property exists on this pool then we
* copy it out so that external consumers can tell which
* pools are bootable.
*/
if ((!error || error == EEXIST) && spa->spa_bootfs) {
char *tmpname = kmem_alloc(MAXPATHLEN, KM_PUSHPAGE);
/*
* We have to play games with the name since the
* pool was opened as TRYIMPORT_NAME.
*/
if (dsl_dsobj_to_dsname(spa_name(spa),
spa->spa_bootfs, tmpname) == 0) {
char *cp;
char *dsname = kmem_alloc(MAXPATHLEN, KM_PUSHPAGE);
cp = strchr(tmpname, '/');
if (cp == NULL) {
(void) strlcpy(dsname, tmpname,
MAXPATHLEN);
} else {
(void) snprintf(dsname, MAXPATHLEN,
"%s/%s", poolname, ++cp);
}
VERIFY(nvlist_add_string(config,
ZPOOL_CONFIG_BOOTFS, dsname) == 0);
kmem_free(dsname, MAXPATHLEN);
}
kmem_free(tmpname, MAXPATHLEN);
}
/*
* Add the list of hot spares and level 2 cache devices.
*/
spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER);
spa_add_spares(spa, config);
spa_add_l2cache(spa, config);
spa_config_exit(spa, SCL_CONFIG, FTAG);
}
spa_unload(spa);
spa_deactivate(spa);
spa_remove(spa);
mutex_exit(&spa_namespace_lock);
return (config);
}
/*
* Pool export/destroy
*
* The act of destroying or exporting a pool is very simple. We make sure there
* is no more pending I/O and any references to the pool are gone. Then, we
* update the pool state and sync all the labels to disk, removing the
* configuration from the cache afterwards. If the 'hardforce' flag is set, then
* we don't sync the labels or remove the configuration cache.
*/
static int
spa_export_common(char *pool, int new_state, nvlist_t **oldconfig,
boolean_t force, boolean_t hardforce)
{
spa_t *spa;
if (oldconfig)
*oldconfig = NULL;
if (!(spa_mode_global & FWRITE))
return (SET_ERROR(EROFS));
mutex_enter(&spa_namespace_lock);
if ((spa = spa_lookup(pool)) == NULL) {
mutex_exit(&spa_namespace_lock);
return (SET_ERROR(ENOENT));
}
/*
* Put a hold on the pool, drop the namespace lock, stop async tasks,
* reacquire the namespace lock, and see if we can export.
*/
spa_open_ref(spa, FTAG);
mutex_exit(&spa_namespace_lock);
spa_async_suspend(spa);
mutex_enter(&spa_namespace_lock);
spa_close(spa, FTAG);
/*
* The pool will be in core if it's openable,
* in which case we can modify its state.
*/
if (spa->spa_state != POOL_STATE_UNINITIALIZED && spa->spa_sync_on) {
/*
* Objsets may be open only because they're dirty, so we
* have to force it to sync before checking spa_refcnt.
*/
txg_wait_synced(spa->spa_dsl_pool, 0);
/*
* A pool cannot be exported or destroyed if there are active
* references. If we are resetting a pool, allow references by
* fault injection handlers.
*/
if (!spa_refcount_zero(spa) ||
(spa->spa_inject_ref != 0 &&
new_state != POOL_STATE_UNINITIALIZED)) {
spa_async_resume(spa);
mutex_exit(&spa_namespace_lock);
return (SET_ERROR(EBUSY));
}
/*
* A pool cannot be exported if it has an active shared spare.
* This is to prevent other pools stealing the active spare
* from an exported pool. At user's own will, such pool can
* be forcedly exported.
*/
if (!force && new_state == POOL_STATE_EXPORTED &&
spa_has_active_shared_spare(spa)) {
spa_async_resume(spa);
mutex_exit(&spa_namespace_lock);
return (SET_ERROR(EXDEV));
}
/*
* We want this to be reflected on every label,
* so mark them all dirty. spa_unload() will do the
* final sync that pushes these changes out.
*/
if (new_state != POOL_STATE_UNINITIALIZED && !hardforce) {
spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
spa->spa_state = new_state;
spa->spa_final_txg = spa_last_synced_txg(spa) +
TXG_DEFER_SIZE + 1;
vdev_config_dirty(spa->spa_root_vdev);
spa_config_exit(spa, SCL_ALL, FTAG);
}
}
spa_event_notify(spa, NULL, FM_EREPORT_ZFS_POOL_DESTROY);
if (spa->spa_state != POOL_STATE_UNINITIALIZED) {
spa_unload(spa);
spa_deactivate(spa);
}
if (oldconfig && spa->spa_config)
VERIFY(nvlist_dup(spa->spa_config, oldconfig, 0) == 0);
if (new_state != POOL_STATE_UNINITIALIZED) {
if (!hardforce)
spa_config_sync(spa, B_TRUE, B_TRUE);
spa_remove(spa);
}
mutex_exit(&spa_namespace_lock);
return (0);
}
/*
* Destroy a storage pool.
*/
int
spa_destroy(char *pool)
{
return (spa_export_common(pool, POOL_STATE_DESTROYED, NULL,
B_FALSE, B_FALSE));
}
/*
* Export a storage pool.
*/
int
spa_export(char *pool, nvlist_t **oldconfig, boolean_t force,
boolean_t hardforce)
{
return (spa_export_common(pool, POOL_STATE_EXPORTED, oldconfig,
force, hardforce));
}
/*
* Similar to spa_export(), this unloads the spa_t without actually removing it
* from the namespace in any way.
*/
int
spa_reset(char *pool)
{
return (spa_export_common(pool, POOL_STATE_UNINITIALIZED, NULL,
B_FALSE, B_FALSE));
}
/*
* ==========================================================================
* Device manipulation
* ==========================================================================
*/
/*
* Add a device to a storage pool.
*/
int
spa_vdev_add(spa_t *spa, nvlist_t *nvroot)
{
uint64_t txg, id;
int error;
vdev_t *rvd = spa->spa_root_vdev;
vdev_t *vd, *tvd;
nvlist_t **spares, **l2cache;
uint_t nspares, nl2cache;
int c;
ASSERT(spa_writeable(spa));
txg = spa_vdev_enter(spa);
if ((error = spa_config_parse(spa, &vd, nvroot, NULL, 0,
VDEV_ALLOC_ADD)) != 0)
return (spa_vdev_exit(spa, NULL, txg, error));
spa->spa_pending_vdev = vd; /* spa_vdev_exit() will clear this */
if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_SPARES, &spares,
&nspares) != 0)
nspares = 0;
if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_L2CACHE, &l2cache,
&nl2cache) != 0)
nl2cache = 0;
if (vd->vdev_children == 0 && nspares == 0 && nl2cache == 0)
return (spa_vdev_exit(spa, vd, txg, EINVAL));
if (vd->vdev_children != 0 &&
(error = vdev_create(vd, txg, B_FALSE)) != 0)
return (spa_vdev_exit(spa, vd, txg, error));
/*
* We must validate the spares and l2cache devices after checking the
* children. Otherwise, vdev_inuse() will blindly overwrite the spare.
*/
if ((error = spa_validate_aux(spa, nvroot, txg, VDEV_ALLOC_ADD)) != 0)
return (spa_vdev_exit(spa, vd, txg, error));
/*
* Transfer each new top-level vdev from vd to rvd.
*/
for (c = 0; c < vd->vdev_children; c++) {
/*
* Set the vdev id to the first hole, if one exists.
*/
for (id = 0; id < rvd->vdev_children; id++) {
if (rvd->vdev_child[id]->vdev_ishole) {
vdev_free(rvd->vdev_child[id]);
break;
}
}
tvd = vd->vdev_child[c];
vdev_remove_child(vd, tvd);
tvd->vdev_id = id;
vdev_add_child(rvd, tvd);
vdev_config_dirty(tvd);
}
if (nspares != 0) {
spa_set_aux_vdevs(&spa->spa_spares, spares, nspares,
ZPOOL_CONFIG_SPARES);
spa_load_spares(spa);
spa->spa_spares.sav_sync = B_TRUE;
}
if (nl2cache != 0) {
spa_set_aux_vdevs(&spa->spa_l2cache, l2cache, nl2cache,
ZPOOL_CONFIG_L2CACHE);
spa_load_l2cache(spa);
spa->spa_l2cache.sav_sync = B_TRUE;
}
/*
* We have to be careful when adding new vdevs to an existing pool.
* If other threads start allocating from these vdevs before we
* sync the config cache, and we lose power, then upon reboot we may
* fail to open the pool because there are DVAs that the config cache
* can't translate. Therefore, we first add the vdevs without
* initializing metaslabs; sync the config cache (via spa_vdev_exit());
* and then let spa_config_update() initialize the new metaslabs.
*
* spa_load() checks for added-but-not-initialized vdevs, so that
* if we lose power at any point in this sequence, the remaining
* steps will be completed the next time we load the pool.
*/
(void) spa_vdev_exit(spa, vd, txg, 0);
mutex_enter(&spa_namespace_lock);
spa_config_update(spa, SPA_CONFIG_UPDATE_POOL);
mutex_exit(&spa_namespace_lock);
return (0);
}
/*
* Attach a device to a mirror. The arguments are the path to any device
* in the mirror, and the nvroot for the new device. If the path specifies
* a device that is not mirrored, we automatically insert the mirror vdev.
*
* If 'replacing' is specified, the new device is intended to replace the
* existing device; in this case the two devices are made into their own
* mirror using the 'replacing' vdev, which is functionally identical to
* the mirror vdev (it actually reuses all the same ops) but has a few
* extra rules: you can't attach to it after it's been created, and upon
* completion of resilvering, the first disk (the one being replaced)
* is automatically detached.
*/
int
spa_vdev_attach(spa_t *spa, uint64_t guid, nvlist_t *nvroot, int replacing)
{
uint64_t txg, dtl_max_txg;
vdev_t *oldvd, *newvd, *newrootvd, *pvd, *tvd;
vdev_ops_t *pvops;
char *oldvdpath, *newvdpath;
int newvd_isspare;
int error;
ASSERTV(vdev_t *rvd = spa->spa_root_vdev);
ASSERT(spa_writeable(spa));
txg = spa_vdev_enter(spa);
oldvd = spa_lookup_by_guid(spa, guid, B_FALSE);
if (oldvd == NULL)
return (spa_vdev_exit(spa, NULL, txg, ENODEV));
if (!oldvd->vdev_ops->vdev_op_leaf)
return (spa_vdev_exit(spa, NULL, txg, ENOTSUP));
pvd = oldvd->vdev_parent;
if ((error = spa_config_parse(spa, &newrootvd, nvroot, NULL, 0,
VDEV_ALLOC_ATTACH)) != 0)
return (spa_vdev_exit(spa, NULL, txg, EINVAL));
if (newrootvd->vdev_children != 1)
return (spa_vdev_exit(spa, newrootvd, txg, EINVAL));
newvd = newrootvd->vdev_child[0];
if (!newvd->vdev_ops->vdev_op_leaf)
return (spa_vdev_exit(spa, newrootvd, txg, EINVAL));
if ((error = vdev_create(newrootvd, txg, replacing)) != 0)
return (spa_vdev_exit(spa, newrootvd, txg, error));
/*
* Spares can't replace logs
*/
if (oldvd->vdev_top->vdev_islog && newvd->vdev_isspare)
return (spa_vdev_exit(spa, newrootvd, txg, ENOTSUP));
if (!replacing) {
/*
* For attach, the only allowable parent is a mirror or the root
* vdev.
*/
if (pvd->vdev_ops != &vdev_mirror_ops &&
pvd->vdev_ops != &vdev_root_ops)
return (spa_vdev_exit(spa, newrootvd, txg, ENOTSUP));
pvops = &vdev_mirror_ops;
} else {
/*
* Active hot spares can only be replaced by inactive hot
* spares.
*/
if (pvd->vdev_ops == &vdev_spare_ops &&
oldvd->vdev_isspare &&
!spa_has_spare(spa, newvd->vdev_guid))
return (spa_vdev_exit(spa, newrootvd, txg, ENOTSUP));
/*
* If the source is a hot spare, and the parent isn't already a
* spare, then we want to create a new hot spare. Otherwise, we
* want to create a replacing vdev. The user is not allowed to
* attach to a spared vdev child unless the 'isspare' state is
* the same (spare replaces spare, non-spare replaces
* non-spare).
*/
if (pvd->vdev_ops == &vdev_replacing_ops &&
spa_version(spa) < SPA_VERSION_MULTI_REPLACE) {
return (spa_vdev_exit(spa, newrootvd, txg, ENOTSUP));
} else if (pvd->vdev_ops == &vdev_spare_ops &&
newvd->vdev_isspare != oldvd->vdev_isspare) {
return (spa_vdev_exit(spa, newrootvd, txg, ENOTSUP));
}
if (newvd->vdev_isspare)
pvops = &vdev_spare_ops;
else
pvops = &vdev_replacing_ops;
}
/*
* Make sure the new device is big enough.
*/
if (newvd->vdev_asize < vdev_get_min_asize(oldvd))
return (spa_vdev_exit(spa, newrootvd, txg, EOVERFLOW));
/*
* The new device cannot have a higher alignment requirement
* than the top-level vdev.
*/
if (newvd->vdev_ashift > oldvd->vdev_top->vdev_ashift)
return (spa_vdev_exit(spa, newrootvd, txg, EDOM));
/*
* If this is an in-place replacement, update oldvd's path and devid
* to make it distinguishable from newvd, and unopenable from now on.
*/
if (strcmp(oldvd->vdev_path, newvd->vdev_path) == 0) {
spa_strfree(oldvd->vdev_path);
oldvd->vdev_path = kmem_alloc(strlen(newvd->vdev_path) + 5,
KM_PUSHPAGE);
(void) sprintf(oldvd->vdev_path, "%s/%s",
newvd->vdev_path, "old");
if (oldvd->vdev_devid != NULL) {
spa_strfree(oldvd->vdev_devid);
oldvd->vdev_devid = NULL;
}
}
/* mark the device being resilvered */
newvd->vdev_resilver_txg = txg;
/*
* If the parent is not a mirror, or if we're replacing, insert the new
* mirror/replacing/spare vdev above oldvd.
*/
if (pvd->vdev_ops != pvops)
pvd = vdev_add_parent(oldvd, pvops);
ASSERT(pvd->vdev_top->vdev_parent == rvd);
ASSERT(pvd->vdev_ops == pvops);
ASSERT(oldvd->vdev_parent == pvd);
/*
* Extract the new device from its root and add it to pvd.
*/
vdev_remove_child(newrootvd, newvd);
newvd->vdev_id = pvd->vdev_children;
newvd->vdev_crtxg = oldvd->vdev_crtxg;
vdev_add_child(pvd, newvd);
tvd = newvd->vdev_top;
ASSERT(pvd->vdev_top == tvd);
ASSERT(tvd->vdev_parent == rvd);
vdev_config_dirty(tvd);
/*
* Set newvd's DTL to [TXG_INITIAL, dtl_max_txg) so that we account
* for any dmu_sync-ed blocks. It will propagate upward when
* spa_vdev_exit() calls vdev_dtl_reassess().
*/
dtl_max_txg = txg + TXG_CONCURRENT_STATES;
vdev_dtl_dirty(newvd, DTL_MISSING, TXG_INITIAL,
dtl_max_txg - TXG_INITIAL);
if (newvd->vdev_isspare) {
spa_spare_activate(newvd);
spa_event_notify(spa, newvd, FM_EREPORT_ZFS_DEVICE_SPARE);
}
oldvdpath = spa_strdup(oldvd->vdev_path);
newvdpath = spa_strdup(newvd->vdev_path);
newvd_isspare = newvd->vdev_isspare;
/*
* Mark newvd's DTL dirty in this txg.
*/
vdev_dirty(tvd, VDD_DTL, newvd, txg);
/*
* Restart the resilver
*/
dsl_resilver_restart(spa->spa_dsl_pool, dtl_max_txg);
/*
* Commit the config
*/
(void) spa_vdev_exit(spa, newrootvd, dtl_max_txg, 0);
spa_history_log_internal(spa, "vdev attach", NULL,
"%s vdev=%s %s vdev=%s",
replacing && newvd_isspare ? "spare in" :
replacing ? "replace" : "attach", newvdpath,
replacing ? "for" : "to", oldvdpath);
spa_strfree(oldvdpath);
spa_strfree(newvdpath);
if (spa->spa_bootfs)
spa_event_notify(spa, newvd, FM_EREPORT_ZFS_BOOTFS_VDEV_ATTACH);
return (0);
}
/*
* Detach a device from a mirror or replacing vdev.
*
* If 'replace_done' is specified, only detach if the parent
* is a replacing vdev.
*/
int
spa_vdev_detach(spa_t *spa, uint64_t guid, uint64_t pguid, int replace_done)
{
uint64_t txg;
int error;
vdev_t *vd, *pvd, *cvd, *tvd;
boolean_t unspare = B_FALSE;
uint64_t unspare_guid = 0;
char *vdpath;
int c, t;
ASSERTV(vdev_t *rvd = spa->spa_root_vdev);
ASSERT(spa_writeable(spa));
txg = spa_vdev_enter(spa);
vd = spa_lookup_by_guid(spa, guid, B_FALSE);
if (vd == NULL)
return (spa_vdev_exit(spa, NULL, txg, ENODEV));
if (!vd->vdev_ops->vdev_op_leaf)
return (spa_vdev_exit(spa, NULL, txg, ENOTSUP));
pvd = vd->vdev_parent;
/*
* If the parent/child relationship is not as expected, don't do it.
* Consider M(A,R(B,C)) -- that is, a mirror of A with a replacing
* vdev that's replacing B with C. The user's intent in replacing
* is to go from M(A,B) to M(A,C). If the user decides to cancel
* the replace by detaching C, the expected behavior is to end up
* M(A,B). But suppose that right after deciding to detach C,
* the replacement of B completes. We would have M(A,C), and then
* ask to detach C, which would leave us with just A -- not what
* the user wanted. To prevent this, we make sure that the
* parent/child relationship hasn't changed -- in this example,
* that C's parent is still the replacing vdev R.
*/
if (pvd->vdev_guid != pguid && pguid != 0)
return (spa_vdev_exit(spa, NULL, txg, EBUSY));
/*
* Only 'replacing' or 'spare' vdevs can be replaced.
*/
if (replace_done && pvd->vdev_ops != &vdev_replacing_ops &&
pvd->vdev_ops != &vdev_spare_ops)
return (spa_vdev_exit(spa, NULL, txg, ENOTSUP));
ASSERT(pvd->vdev_ops != &vdev_spare_ops ||
spa_version(spa) >= SPA_VERSION_SPARES);
/*
* Only mirror, replacing, and spare vdevs support detach.
*/
if (pvd->vdev_ops != &vdev_replacing_ops &&
pvd->vdev_ops != &vdev_mirror_ops &&
pvd->vdev_ops != &vdev_spare_ops)
return (spa_vdev_exit(spa, NULL, txg, ENOTSUP));
/*
* If this device has the only valid copy of some data,
* we cannot safely detach it.
*/
if (vdev_dtl_required(vd))
return (spa_vdev_exit(spa, NULL, txg, EBUSY));
ASSERT(pvd->vdev_children >= 2);
/*
* If we are detaching the second disk from a replacing vdev, then
* check to see if we changed the original vdev's path to have "/old"
* at the end in spa_vdev_attach(). If so, undo that change now.
*/
if (pvd->vdev_ops == &vdev_replacing_ops && vd->vdev_id > 0 &&
vd->vdev_path != NULL) {
size_t len = strlen(vd->vdev_path);
for (c = 0; c < pvd->vdev_children; c++) {
cvd = pvd->vdev_child[c];
if (cvd == vd || cvd->vdev_path == NULL)
continue;
if (strncmp(cvd->vdev_path, vd->vdev_path, len) == 0 &&
strcmp(cvd->vdev_path + len, "/old") == 0) {
spa_strfree(cvd->vdev_path);
cvd->vdev_path = spa_strdup(vd->vdev_path);
break;
}
}
}
/*
* If we are detaching the original disk from a spare, then it implies
* that the spare should become a real disk, and be removed from the
* active spare list for the pool.
*/
if (pvd->vdev_ops == &vdev_spare_ops &&
vd->vdev_id == 0 &&
pvd->vdev_child[pvd->vdev_children - 1]->vdev_isspare)
unspare = B_TRUE;
/*
* Erase the disk labels so the disk can be used for other things.
* This must be done after all other error cases are handled,
* but before we disembowel vd (so we can still do I/O to it).
* But if we can't do it, don't treat the error as fatal --
* it may be that the unwritability of the disk is the reason
* it's being detached!
*/
error = vdev_label_init(vd, 0, VDEV_LABEL_REMOVE);
/*
* Remove vd from its parent and compact the parent's children.
*/
vdev_remove_child(pvd, vd);
vdev_compact_children(pvd);
/*
* Remember one of the remaining children so we can get tvd below.
*/
cvd = pvd->vdev_child[pvd->vdev_children - 1];
/*
* If we need to remove the remaining child from the list of hot spares,
* do it now, marking the vdev as no longer a spare in the process.
* We must do this before vdev_remove_parent(), because that can
* change the GUID if it creates a new toplevel GUID. For a similar
* reason, we must remove the spare now, in the same txg as the detach;
* otherwise someone could attach a new sibling, change the GUID, and
* the subsequent attempt to spa_vdev_remove(unspare_guid) would fail.
*/
if (unspare) {
ASSERT(cvd->vdev_isspare);
spa_spare_remove(cvd);
unspare_guid = cvd->vdev_guid;
(void) spa_vdev_remove(spa, unspare_guid, B_TRUE);
cvd->vdev_unspare = B_TRUE;
}
/*
* If the parent mirror/replacing vdev only has one child,
* the parent is no longer needed. Remove it from the tree.
*/
if (pvd->vdev_children == 1) {
if (pvd->vdev_ops == &vdev_spare_ops)
cvd->vdev_unspare = B_FALSE;
vdev_remove_parent(cvd);
}
/*
* We don't set tvd until now because the parent we just removed
* may have been the previous top-level vdev.
*/
tvd = cvd->vdev_top;
ASSERT(tvd->vdev_parent == rvd);
/*
* Reevaluate the parent vdev state.
*/
vdev_propagate_state(cvd);
/*
* If the 'autoexpand' property is set on the pool then automatically
* try to expand the size of the pool. For example if the device we
* just detached was smaller than the others, it may be possible to
* add metaslabs (i.e. grow the pool). We need to reopen the vdev
* first so that we can obtain the updated sizes of the leaf vdevs.
*/
if (spa->spa_autoexpand) {
vdev_reopen(tvd);
vdev_expand(tvd, txg);
}
vdev_config_dirty(tvd);
/*
* Mark vd's DTL as dirty in this txg. vdev_dtl_sync() will see that
* vd->vdev_detached is set and free vd's DTL object in syncing context.
* But first make sure we're not on any *other* txg's DTL list, to
* prevent vd from being accessed after it's freed.
*/
vdpath = spa_strdup(vd->vdev_path);
for (t = 0; t < TXG_SIZE; t++)
(void) txg_list_remove_this(&tvd->vdev_dtl_list, vd, t);
vd->vdev_detached = B_TRUE;
vdev_dirty(tvd, VDD_DTL, vd, txg);
spa_event_notify(spa, vd, FM_EREPORT_ZFS_DEVICE_REMOVE);
/* hang on to the spa before we release the lock */
spa_open_ref(spa, FTAG);
error = spa_vdev_exit(spa, vd, txg, 0);
spa_history_log_internal(spa, "detach", NULL,
"vdev=%s", vdpath);
spa_strfree(vdpath);
/*
* If this was the removal of the original device in a hot spare vdev,
* then we want to go through and remove the device from the hot spare
* list of every other pool.
*/
if (unspare) {
spa_t *altspa = NULL;
mutex_enter(&spa_namespace_lock);
while ((altspa = spa_next(altspa)) != NULL) {
if (altspa->spa_state != POOL_STATE_ACTIVE ||
altspa == spa)
continue;
spa_open_ref(altspa, FTAG);
mutex_exit(&spa_namespace_lock);
(void) spa_vdev_remove(altspa, unspare_guid, B_TRUE);
mutex_enter(&spa_namespace_lock);
spa_close(altspa, FTAG);
}
mutex_exit(&spa_namespace_lock);
/* search the rest of the vdevs for spares to remove */
spa_vdev_resilver_done(spa);
}
/* all done with the spa; OK to release */
mutex_enter(&spa_namespace_lock);
spa_close(spa, FTAG);
mutex_exit(&spa_namespace_lock);
return (error);
}
/*
* Split a set of devices from their mirrors, and create a new pool from them.
*/
int
spa_vdev_split_mirror(spa_t *spa, char *newname, nvlist_t *config,
nvlist_t *props, boolean_t exp)
{
int error = 0;
uint64_t txg, *glist;
spa_t *newspa;
uint_t c, children, lastlog;
nvlist_t **child, *nvl, *tmp;
dmu_tx_t *tx;
char *altroot = NULL;
vdev_t *rvd, **vml = NULL; /* vdev modify list */
boolean_t activate_slog;
ASSERT(spa_writeable(spa));
txg = spa_vdev_enter(spa);
/* clear the log and flush everything up to now */
activate_slog = spa_passivate_log(spa);
(void) spa_vdev_config_exit(spa, NULL, txg, 0, FTAG);
error = spa_offline_log(spa);
txg = spa_vdev_config_enter(spa);
if (activate_slog)
spa_activate_log(spa);
if (error != 0)
return (spa_vdev_exit(spa, NULL, txg, error));
/* check new spa name before going any further */
if (spa_lookup(newname) != NULL)
return (spa_vdev_exit(spa, NULL, txg, EEXIST));
/*
* scan through all the children to ensure they're all mirrors
*/
if (nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, &nvl) != 0 ||
nvlist_lookup_nvlist_array(nvl, ZPOOL_CONFIG_CHILDREN, &child,
&children) != 0)
return (spa_vdev_exit(spa, NULL, txg, EINVAL));
/* first, check to ensure we've got the right child count */
rvd = spa->spa_root_vdev;
lastlog = 0;
for (c = 0; c < rvd->vdev_children; c++) {
vdev_t *vd = rvd->vdev_child[c];
/* don't count the holes & logs as children */
if (vd->vdev_islog || vd->vdev_ishole) {
if (lastlog == 0)
lastlog = c;
continue;
}
lastlog = 0;
}
if (children != (lastlog != 0 ? lastlog : rvd->vdev_children))
return (spa_vdev_exit(spa, NULL, txg, EINVAL));
/* next, ensure no spare or cache devices are part of the split */
if (nvlist_lookup_nvlist(nvl, ZPOOL_CONFIG_SPARES, &tmp) == 0 ||
nvlist_lookup_nvlist(nvl, ZPOOL_CONFIG_L2CACHE, &tmp) == 0)
return (spa_vdev_exit(spa, NULL, txg, EINVAL));
vml = kmem_zalloc(children * sizeof (vdev_t *), KM_PUSHPAGE);
glist = kmem_zalloc(children * sizeof (uint64_t), KM_PUSHPAGE);
/* then, loop over each vdev and validate it */
for (c = 0; c < children; c++) {
uint64_t is_hole = 0;
(void) nvlist_lookup_uint64(child[c], ZPOOL_CONFIG_IS_HOLE,
&is_hole);
if (is_hole != 0) {
if (spa->spa_root_vdev->vdev_child[c]->vdev_ishole ||
spa->spa_root_vdev->vdev_child[c]->vdev_islog) {
continue;
} else {
error = SET_ERROR(EINVAL);
break;
}
}
/* which disk is going to be split? */
if (nvlist_lookup_uint64(child[c], ZPOOL_CONFIG_GUID,
&glist[c]) != 0) {
error = SET_ERROR(EINVAL);
break;
}
/* look it up in the spa */
vml[c] = spa_lookup_by_guid(spa, glist[c], B_FALSE);
if (vml[c] == NULL) {
error = SET_ERROR(ENODEV);
break;
}
/* make sure there's nothing stopping the split */
if (vml[c]->vdev_parent->vdev_ops != &vdev_mirror_ops ||
vml[c]->vdev_islog ||
vml[c]->vdev_ishole ||
vml[c]->vdev_isspare ||
vml[c]->vdev_isl2cache ||
!vdev_writeable(vml[c]) ||
vml[c]->vdev_children != 0 ||
vml[c]->vdev_state != VDEV_STATE_HEALTHY ||
c != spa->spa_root_vdev->vdev_child[c]->vdev_id) {
error = SET_ERROR(EINVAL);
break;
}
if (vdev_dtl_required(vml[c])) {
error = SET_ERROR(EBUSY);
break;
}
/* we need certain info from the top level */
VERIFY(nvlist_add_uint64(child[c], ZPOOL_CONFIG_METASLAB_ARRAY,
vml[c]->vdev_top->vdev_ms_array) == 0);
VERIFY(nvlist_add_uint64(child[c], ZPOOL_CONFIG_METASLAB_SHIFT,
vml[c]->vdev_top->vdev_ms_shift) == 0);
VERIFY(nvlist_add_uint64(child[c], ZPOOL_CONFIG_ASIZE,
vml[c]->vdev_top->vdev_asize) == 0);
VERIFY(nvlist_add_uint64(child[c], ZPOOL_CONFIG_ASHIFT,
vml[c]->vdev_top->vdev_ashift) == 0);
}
if (error != 0) {
kmem_free(vml, children * sizeof (vdev_t *));
kmem_free(glist, children * sizeof (uint64_t));
return (spa_vdev_exit(spa, NULL, txg, error));
}
/* stop writers from using the disks */
for (c = 0; c < children; c++) {
if (vml[c] != NULL)
vml[c]->vdev_offline = B_TRUE;
}
vdev_reopen(spa->spa_root_vdev);
/*
* Temporarily record the splitting vdevs in the spa config. This
* will disappear once the config is regenerated.
*/
VERIFY(nvlist_alloc(&nvl, NV_UNIQUE_NAME, KM_PUSHPAGE) == 0);
VERIFY(nvlist_add_uint64_array(nvl, ZPOOL_CONFIG_SPLIT_LIST,
glist, children) == 0);
kmem_free(glist, children * sizeof (uint64_t));
mutex_enter(&spa->spa_props_lock);
VERIFY(nvlist_add_nvlist(spa->spa_config, ZPOOL_CONFIG_SPLIT,
nvl) == 0);
mutex_exit(&spa->spa_props_lock);
spa->spa_config_splitting = nvl;
vdev_config_dirty(spa->spa_root_vdev);
/* configure and create the new pool */
VERIFY(nvlist_add_string(config, ZPOOL_CONFIG_POOL_NAME, newname) == 0);
VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_POOL_STATE,
exp ? POOL_STATE_EXPORTED : POOL_STATE_ACTIVE) == 0);
VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_VERSION,
spa_version(spa)) == 0);
VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_POOL_TXG,
spa->spa_config_txg) == 0);
VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_POOL_GUID,
spa_generate_guid(NULL)) == 0);
(void) nvlist_lookup_string(props,
zpool_prop_to_name(ZPOOL_PROP_ALTROOT), &altroot);
/* add the new pool to the namespace */
newspa = spa_add(newname, config, altroot);
newspa->spa_config_txg = spa->spa_config_txg;
spa_set_log_state(newspa, SPA_LOG_CLEAR);
/* release the spa config lock, retaining the namespace lock */
spa_vdev_config_exit(spa, NULL, txg, 0, FTAG);
if (zio_injection_enabled)
zio_handle_panic_injection(spa, FTAG, 1);
spa_activate(newspa, spa_mode_global);
spa_async_suspend(newspa);
/* create the new pool from the disks of the original pool */
error = spa_load(newspa, SPA_LOAD_IMPORT, SPA_IMPORT_ASSEMBLE, B_TRUE);
if (error)
goto out;
/* if that worked, generate a real config for the new pool */
if (newspa->spa_root_vdev != NULL) {
VERIFY(nvlist_alloc(&newspa->spa_config_splitting,
NV_UNIQUE_NAME, KM_PUSHPAGE) == 0);
VERIFY(nvlist_add_uint64(newspa->spa_config_splitting,
ZPOOL_CONFIG_SPLIT_GUID, spa_guid(spa)) == 0);
spa_config_set(newspa, spa_config_generate(newspa, NULL, -1ULL,
B_TRUE));
}
/* set the props */
if (props != NULL) {
spa_configfile_set(newspa, props, B_FALSE);
error = spa_prop_set(newspa, props);
if (error)
goto out;
}
/* flush everything */
txg = spa_vdev_config_enter(newspa);
vdev_config_dirty(newspa->spa_root_vdev);
(void) spa_vdev_config_exit(newspa, NULL, txg, 0, FTAG);
if (zio_injection_enabled)
zio_handle_panic_injection(spa, FTAG, 2);
spa_async_resume(newspa);
/* finally, update the original pool's config */
txg = spa_vdev_config_enter(spa);
tx = dmu_tx_create_dd(spa_get_dsl(spa)->dp_mos_dir);
error = dmu_tx_assign(tx, TXG_WAIT);
if (error != 0)
dmu_tx_abort(tx);
for (c = 0; c < children; c++) {
if (vml[c] != NULL) {
vdev_split(vml[c]);
if (error == 0)
spa_history_log_internal(spa, "detach", tx,
"vdev=%s", vml[c]->vdev_path);
vdev_free(vml[c]);
}
}
vdev_config_dirty(spa->spa_root_vdev);
spa->spa_config_splitting = NULL;
nvlist_free(nvl);
if (error == 0)
dmu_tx_commit(tx);
(void) spa_vdev_exit(spa, NULL, txg, 0);
if (zio_injection_enabled)
zio_handle_panic_injection(spa, FTAG, 3);
/* split is complete; log a history record */
spa_history_log_internal(newspa, "split", NULL,
"from pool %s", spa_name(spa));
kmem_free(vml, children * sizeof (vdev_t *));
/* if we're not going to mount the filesystems in userland, export */
if (exp)
error = spa_export_common(newname, POOL_STATE_EXPORTED, NULL,
B_FALSE, B_FALSE);
return (error);
out:
spa_unload(newspa);
spa_deactivate(newspa);
spa_remove(newspa);
txg = spa_vdev_config_enter(spa);
/* re-online all offlined disks */
for (c = 0; c < children; c++) {
if (vml[c] != NULL)
vml[c]->vdev_offline = B_FALSE;
}
vdev_reopen(spa->spa_root_vdev);
nvlist_free(spa->spa_config_splitting);
spa->spa_config_splitting = NULL;
(void) spa_vdev_exit(spa, NULL, txg, error);
kmem_free(vml, children * sizeof (vdev_t *));
return (error);
}
static nvlist_t *
spa_nvlist_lookup_by_guid(nvlist_t **nvpp, int count, uint64_t target_guid)
{
int i;
for (i = 0; i < count; i++) {
uint64_t guid;
VERIFY(nvlist_lookup_uint64(nvpp[i], ZPOOL_CONFIG_GUID,
&guid) == 0);
if (guid == target_guid)
return (nvpp[i]);
}
return (NULL);
}
static void
spa_vdev_remove_aux(nvlist_t *config, char *name, nvlist_t **dev, int count,
nvlist_t *dev_to_remove)
{
nvlist_t **newdev = NULL;
int i, j;
if (count > 1)
newdev = kmem_alloc((count - 1) * sizeof (void *), KM_PUSHPAGE);
for (i = 0, j = 0; i < count; i++) {
if (dev[i] == dev_to_remove)
continue;
VERIFY(nvlist_dup(dev[i], &newdev[j++], KM_PUSHPAGE) == 0);
}
VERIFY(nvlist_remove(config, name, DATA_TYPE_NVLIST_ARRAY) == 0);
VERIFY(nvlist_add_nvlist_array(config, name, newdev, count - 1) == 0);
for (i = 0; i < count - 1; i++)
nvlist_free(newdev[i]);
if (count > 1)
kmem_free(newdev, (count - 1) * sizeof (void *));
}
/*
* Evacuate the device.
*/
static int
spa_vdev_remove_evacuate(spa_t *spa, vdev_t *vd)
{
uint64_t txg;
int error = 0;
ASSERT(MUTEX_HELD(&spa_namespace_lock));
ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == 0);
ASSERT(vd == vd->vdev_top);
/*
* Evacuate the device. We don't hold the config lock as writer
* since we need to do I/O but we do keep the
* spa_namespace_lock held. Once this completes the device
* should no longer have any blocks allocated on it.
*/
if (vd->vdev_islog) {
if (vd->vdev_stat.vs_alloc != 0)
error = spa_offline_log(spa);
} else {
error = SET_ERROR(ENOTSUP);
}
if (error)
return (error);
/*
* The evacuation succeeded. Remove any remaining MOS metadata
* associated with this vdev, and wait for these changes to sync.
*/
ASSERT0(vd->vdev_stat.vs_alloc);
txg = spa_vdev_config_enter(spa);
vd->vdev_removing = B_TRUE;
vdev_dirty(vd, 0, NULL, txg);
vdev_config_dirty(vd);
spa_vdev_config_exit(spa, NULL, txg, 0, FTAG);
return (0);
}
/*
* Complete the removal by cleaning up the namespace.
*/
static void
spa_vdev_remove_from_namespace(spa_t *spa, vdev_t *vd)
{
vdev_t *rvd = spa->spa_root_vdev;
uint64_t id = vd->vdev_id;
boolean_t last_vdev = (id == (rvd->vdev_children - 1));
ASSERT(MUTEX_HELD(&spa_namespace_lock));
ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL);
ASSERT(vd == vd->vdev_top);
/*
* Only remove any devices which are empty.
*/
if (vd->vdev_stat.vs_alloc != 0)
return;
(void) vdev_label_init(vd, 0, VDEV_LABEL_REMOVE);
if (list_link_active(&vd->vdev_state_dirty_node))
vdev_state_clean(vd);
if (list_link_active(&vd->vdev_config_dirty_node))
vdev_config_clean(vd);
vdev_free(vd);
if (last_vdev) {
vdev_compact_children(rvd);
} else {
vd = vdev_alloc_common(spa, id, 0, &vdev_hole_ops);
vdev_add_child(rvd, vd);
}
vdev_config_dirty(rvd);
/*
* Reassess the health of our root vdev.
*/
vdev_reopen(rvd);
}
/*
* Remove a device from the pool -
*
* Removing a device from the vdev namespace requires several steps
* and can take a significant amount of time. As a result we use
* the spa_vdev_config_[enter/exit] functions which allow us to
* grab and release the spa_config_lock while still holding the namespace
* lock. During each step the configuration is synced out.
*
* Currently, this supports removing only hot spares, slogs, and level 2 ARC
* devices.
*/
int
spa_vdev_remove(spa_t *spa, uint64_t guid, boolean_t unspare)
{
vdev_t *vd;
metaslab_group_t *mg;
nvlist_t **spares, **l2cache, *nv;
uint64_t txg = 0;
uint_t nspares, nl2cache;
int error = 0;
boolean_t locked = MUTEX_HELD(&spa_namespace_lock);
ASSERT(spa_writeable(spa));
if (!locked)
txg = spa_vdev_enter(spa);
vd = spa_lookup_by_guid(spa, guid, B_FALSE);
if (spa->spa_spares.sav_vdevs != NULL &&
nvlist_lookup_nvlist_array(spa->spa_spares.sav_config,
ZPOOL_CONFIG_SPARES, &spares, &nspares) == 0 &&
(nv = spa_nvlist_lookup_by_guid(spares, nspares, guid)) != NULL) {
/*
* Only remove the hot spare if it's not currently in use
* in this pool.
*/
if (vd == NULL || unspare) {
spa_vdev_remove_aux(spa->spa_spares.sav_config,
ZPOOL_CONFIG_SPARES, spares, nspares, nv);
spa_load_spares(spa);
spa->spa_spares.sav_sync = B_TRUE;
} else {
error = SET_ERROR(EBUSY);
}
} else if (spa->spa_l2cache.sav_vdevs != NULL &&
nvlist_lookup_nvlist_array(spa->spa_l2cache.sav_config,
ZPOOL_CONFIG_L2CACHE, &l2cache, &nl2cache) == 0 &&
(nv = spa_nvlist_lookup_by_guid(l2cache, nl2cache, guid)) != NULL) {
/*
* Cache devices can always be removed.
*/
spa_vdev_remove_aux(spa->spa_l2cache.sav_config,
ZPOOL_CONFIG_L2CACHE, l2cache, nl2cache, nv);
spa_load_l2cache(spa);
spa->spa_l2cache.sav_sync = B_TRUE;
} else if (vd != NULL && vd->vdev_islog) {
ASSERT(!locked);
ASSERT(vd == vd->vdev_top);
/*
* XXX - Once we have bp-rewrite this should
* become the common case.
*/
mg = vd->vdev_mg;
/*
* Stop allocating from this vdev.
*/
metaslab_group_passivate(mg);
/*
* Wait for the youngest allocations and frees to sync,
* and then wait for the deferral of those frees to finish.
*/
spa_vdev_config_exit(spa, NULL,
txg + TXG_CONCURRENT_STATES + TXG_DEFER_SIZE, 0, FTAG);
/*
* Attempt to evacuate the vdev.
*/
error = spa_vdev_remove_evacuate(spa, vd);
txg = spa_vdev_config_enter(spa);
/*
* If we couldn't evacuate the vdev, unwind.
*/
if (error) {
metaslab_group_activate(mg);
return (spa_vdev_exit(spa, NULL, txg, error));
}
/*
* Clean up the vdev namespace.
*/
spa_vdev_remove_from_namespace(spa, vd);
} else if (vd != NULL) {
/*
* Normal vdevs cannot be removed (yet).
*/
error = SET_ERROR(ENOTSUP);
} else {
/*
* There is no vdev of any kind with the specified guid.
*/
error = SET_ERROR(ENOENT);
}
if (!locked)
return (spa_vdev_exit(spa, NULL, txg, error));
return (error);
}
/*
* Find any device that's done replacing, or a vdev marked 'unspare' that's
* currently spared, so we can detach it.
*/
static vdev_t *
spa_vdev_resilver_done_hunt(vdev_t *vd)
{
vdev_t *newvd, *oldvd;
int c;
for (c = 0; c < vd->vdev_children; c++) {
oldvd = spa_vdev_resilver_done_hunt(vd->vdev_child[c]);
if (oldvd != NULL)
return (oldvd);
}
/*
* Check for a completed replacement. We always consider the first
* vdev in the list to be the oldest vdev, and the last one to be
* the newest (see spa_vdev_attach() for how that works). In
* the case where the newest vdev is faulted, we will not automatically
* remove it after a resilver completes. This is OK as it will require
* user intervention to determine which disk the admin wishes to keep.
*/
if (vd->vdev_ops == &vdev_replacing_ops) {
ASSERT(vd->vdev_children > 1);
newvd = vd->vdev_child[vd->vdev_children - 1];
oldvd = vd->vdev_child[0];
if (vdev_dtl_empty(newvd, DTL_MISSING) &&
vdev_dtl_empty(newvd, DTL_OUTAGE) &&
!vdev_dtl_required(oldvd))
return (oldvd);
}
/*
* Check for a completed resilver with the 'unspare' flag set.
*/
if (vd->vdev_ops == &vdev_spare_ops) {
vdev_t *first = vd->vdev_child[0];
vdev_t *last = vd->vdev_child[vd->vdev_children - 1];
if (last->vdev_unspare) {
oldvd = first;
newvd = last;
} else if (first->vdev_unspare) {
oldvd = last;
newvd = first;
} else {
oldvd = NULL;
}
if (oldvd != NULL &&
vdev_dtl_empty(newvd, DTL_MISSING) &&
vdev_dtl_empty(newvd, DTL_OUTAGE) &&
!vdev_dtl_required(oldvd))
return (oldvd);
/*
* If there are more than two spares attached to a disk,
* and those spares are not required, then we want to
* attempt to free them up now so that they can be used
* by other pools. Once we're back down to a single
* disk+spare, we stop removing them.
*/
if (vd->vdev_children > 2) {
newvd = vd->vdev_child[1];
if (newvd->vdev_isspare && last->vdev_isspare &&
vdev_dtl_empty(last, DTL_MISSING) &&
vdev_dtl_empty(last, DTL_OUTAGE) &&
!vdev_dtl_required(newvd))
return (newvd);
}
}
return (NULL);
}
static void
spa_vdev_resilver_done(spa_t *spa)
{
vdev_t *vd, *pvd, *ppvd;
uint64_t guid, sguid, pguid, ppguid;
spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
while ((vd = spa_vdev_resilver_done_hunt(spa->spa_root_vdev)) != NULL) {
pvd = vd->vdev_parent;
ppvd = pvd->vdev_parent;
guid = vd->vdev_guid;
pguid = pvd->vdev_guid;
ppguid = ppvd->vdev_guid;
sguid = 0;
/*
* If we have just finished replacing a hot spared device, then
* we need to detach the parent's first child (the original hot
* spare) as well.
*/
if (ppvd->vdev_ops == &vdev_spare_ops && pvd->vdev_id == 0 &&
ppvd->vdev_children == 2) {
ASSERT(pvd->vdev_ops == &vdev_replacing_ops);
sguid = ppvd->vdev_child[1]->vdev_guid;
}
ASSERT(vd->vdev_resilver_txg == 0 || !vdev_dtl_required(vd));
spa_config_exit(spa, SCL_ALL, FTAG);
if (spa_vdev_detach(spa, guid, pguid, B_TRUE) != 0)
return;
if (sguid && spa_vdev_detach(spa, sguid, ppguid, B_TRUE) != 0)
return;
spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
}
spa_config_exit(spa, SCL_ALL, FTAG);
}
/*
* Update the stored path or FRU for this vdev.
*/
int
spa_vdev_set_common(spa_t *spa, uint64_t guid, const char *value,
boolean_t ispath)
{
vdev_t *vd;
boolean_t sync = B_FALSE;
ASSERT(spa_writeable(spa));
spa_vdev_state_enter(spa, SCL_ALL);
if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL)
return (spa_vdev_state_exit(spa, NULL, ENOENT));
if (!vd->vdev_ops->vdev_op_leaf)
return (spa_vdev_state_exit(spa, NULL, ENOTSUP));
if (ispath) {
if (strcmp(value, vd->vdev_path) != 0) {
spa_strfree(vd->vdev_path);
vd->vdev_path = spa_strdup(value);
sync = B_TRUE;
}
} else {
if (vd->vdev_fru == NULL) {
vd->vdev_fru = spa_strdup(value);
sync = B_TRUE;
} else if (strcmp(value, vd->vdev_fru) != 0) {
spa_strfree(vd->vdev_fru);
vd->vdev_fru = spa_strdup(value);
sync = B_TRUE;
}
}
return (spa_vdev_state_exit(spa, sync ? vd : NULL, 0));
}
int
spa_vdev_setpath(spa_t *spa, uint64_t guid, const char *newpath)
{
return (spa_vdev_set_common(spa, guid, newpath, B_TRUE));
}
int
spa_vdev_setfru(spa_t *spa, uint64_t guid, const char *newfru)
{
return (spa_vdev_set_common(spa, guid, newfru, B_FALSE));
}
/*
* ==========================================================================
* SPA Scanning
* ==========================================================================
*/
int
spa_scan_stop(spa_t *spa)
{
ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == 0);
if (dsl_scan_resilvering(spa->spa_dsl_pool))
return (SET_ERROR(EBUSY));
return (dsl_scan_cancel(spa->spa_dsl_pool));
}
int
spa_scan(spa_t *spa, pool_scan_func_t func)
{
ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == 0);
if (func >= POOL_SCAN_FUNCS || func == POOL_SCAN_NONE)
return (SET_ERROR(ENOTSUP));
/*
* If a resilver was requested, but there is no DTL on a
* writeable leaf device, we have nothing to do.
*/
if (func == POOL_SCAN_RESILVER &&
!vdev_resilver_needed(spa->spa_root_vdev, NULL, NULL)) {
spa_async_request(spa, SPA_ASYNC_RESILVER_DONE);
return (0);
}
return (dsl_scan(spa->spa_dsl_pool, func));
}
/*
* ==========================================================================
* SPA async task processing
* ==========================================================================
*/
static void
spa_async_remove(spa_t *spa, vdev_t *vd)
{
int c;
if (vd->vdev_remove_wanted) {
vd->vdev_remove_wanted = B_FALSE;
vd->vdev_delayed_close = B_FALSE;
vdev_set_state(vd, B_FALSE, VDEV_STATE_REMOVED, VDEV_AUX_NONE);
/*
* We want to clear the stats, but we don't want to do a full
* vdev_clear() as that will cause us to throw away
* degraded/faulted state as well as attempt to reopen the
* device, all of which is a waste.
*/
vd->vdev_stat.vs_read_errors = 0;
vd->vdev_stat.vs_write_errors = 0;
vd->vdev_stat.vs_checksum_errors = 0;
vdev_state_dirty(vd->vdev_top);
}
for (c = 0; c < vd->vdev_children; c++)
spa_async_remove(spa, vd->vdev_child[c]);
}
static void
spa_async_probe(spa_t *spa, vdev_t *vd)
{
int c;
if (vd->vdev_probe_wanted) {
vd->vdev_probe_wanted = B_FALSE;
vdev_reopen(vd); /* vdev_open() does the actual probe */
}
for (c = 0; c < vd->vdev_children; c++)
spa_async_probe(spa, vd->vdev_child[c]);
}
static void
spa_async_autoexpand(spa_t *spa, vdev_t *vd)
{
int c;
if (!spa->spa_autoexpand)
return;
for (c = 0; c < vd->vdev_children; c++) {
vdev_t *cvd = vd->vdev_child[c];
spa_async_autoexpand(spa, cvd);
}
if (!vd->vdev_ops->vdev_op_leaf || vd->vdev_physpath == NULL)
return;
spa_event_notify(vd->vdev_spa, vd, FM_EREPORT_ZFS_DEVICE_AUTOEXPAND);
}
static void
spa_async_thread(spa_t *spa)
{
int tasks, i;
ASSERT(spa->spa_sync_on);
mutex_enter(&spa->spa_async_lock);
tasks = spa->spa_async_tasks;
spa->spa_async_tasks = 0;
mutex_exit(&spa->spa_async_lock);
/*
* See if the config needs to be updated.
*/
if (tasks & SPA_ASYNC_CONFIG_UPDATE) {
uint64_t old_space, new_space;
mutex_enter(&spa_namespace_lock);
old_space = metaslab_class_get_space(spa_normal_class(spa));
spa_config_update(spa, SPA_CONFIG_UPDATE_POOL);
new_space = metaslab_class_get_space(spa_normal_class(spa));
mutex_exit(&spa_namespace_lock);
/*
* If the pool grew as a result of the config update,
* then log an internal history event.
*/
if (new_space != old_space) {
spa_history_log_internal(spa, "vdev online", NULL,
"pool '%s' size: %llu(+%llu)",
spa_name(spa), new_space, new_space - old_space);
}
}
/*
* See if any devices need to be marked REMOVED.
*/
if (tasks & SPA_ASYNC_REMOVE) {
spa_vdev_state_enter(spa, SCL_NONE);
spa_async_remove(spa, spa->spa_root_vdev);
for (i = 0; i < spa->spa_l2cache.sav_count; i++)
spa_async_remove(spa, spa->spa_l2cache.sav_vdevs[i]);
for (i = 0; i < spa->spa_spares.sav_count; i++)
spa_async_remove(spa, spa->spa_spares.sav_vdevs[i]);
(void) spa_vdev_state_exit(spa, NULL, 0);
}
if ((tasks & SPA_ASYNC_AUTOEXPAND) && !spa_suspended(spa)) {
spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER);
spa_async_autoexpand(spa, spa->spa_root_vdev);
spa_config_exit(spa, SCL_CONFIG, FTAG);
}
/*
* See if any devices need to be probed.
*/
if (tasks & SPA_ASYNC_PROBE) {
spa_vdev_state_enter(spa, SCL_NONE);
spa_async_probe(spa, spa->spa_root_vdev);
(void) spa_vdev_state_exit(spa, NULL, 0);
}
/*
* If any devices are done replacing, detach them.
*/
if (tasks & SPA_ASYNC_RESILVER_DONE)
spa_vdev_resilver_done(spa);
/*
* Kick off a resilver.
*/
if (tasks & SPA_ASYNC_RESILVER)
dsl_resilver_restart(spa->spa_dsl_pool, 0);
/*
* Let the world know that we're done.
*/
mutex_enter(&spa->spa_async_lock);
spa->spa_async_thread = NULL;
cv_broadcast(&spa->spa_async_cv);
mutex_exit(&spa->spa_async_lock);
thread_exit();
}
void
spa_async_suspend(spa_t *spa)
{
mutex_enter(&spa->spa_async_lock);
spa->spa_async_suspended++;
while (spa->spa_async_thread != NULL)
cv_wait(&spa->spa_async_cv, &spa->spa_async_lock);
mutex_exit(&spa->spa_async_lock);
}
void
spa_async_resume(spa_t *spa)
{
mutex_enter(&spa->spa_async_lock);
ASSERT(spa->spa_async_suspended != 0);
spa->spa_async_suspended--;
mutex_exit(&spa->spa_async_lock);
}
static void
spa_async_dispatch(spa_t *spa)
{
mutex_enter(&spa->spa_async_lock);
if (spa->spa_async_tasks && !spa->spa_async_suspended &&
spa->spa_async_thread == NULL &&
rootdir != NULL && !vn_is_readonly(rootdir))
spa->spa_async_thread = thread_create(NULL, 0,
spa_async_thread, spa, 0, &p0, TS_RUN, maxclsyspri);
mutex_exit(&spa->spa_async_lock);
}
void
spa_async_request(spa_t *spa, int task)
{
zfs_dbgmsg("spa=%s async request task=%u", spa->spa_name, task);
mutex_enter(&spa->spa_async_lock);
spa->spa_async_tasks |= task;
mutex_exit(&spa->spa_async_lock);
}
/*
* ==========================================================================
* SPA syncing routines
* ==========================================================================
*/
static int
bpobj_enqueue_cb(void *arg, const blkptr_t *bp, dmu_tx_t *tx)
{
bpobj_t *bpo = arg;
bpobj_enqueue(bpo, bp, tx);
return (0);
}
static int
spa_free_sync_cb(void *arg, const blkptr_t *bp, dmu_tx_t *tx)
{
zio_t *zio = arg;
zio_nowait(zio_free_sync(zio, zio->io_spa, dmu_tx_get_txg(tx), bp,
zio->io_flags));
return (0);
}
/*
* Note: this simple function is not inlined to make it easier to dtrace the
* amount of time spent syncing frees.
*/
static void
spa_sync_frees(spa_t *spa, bplist_t *bpl, dmu_tx_t *tx)
{
zio_t *zio = zio_root(spa, NULL, NULL, 0);
bplist_iterate(bpl, spa_free_sync_cb, zio, tx);
VERIFY(zio_wait(zio) == 0);
}
/*
* Note: this simple function is not inlined to make it easier to dtrace the
* amount of time spent syncing deferred frees.
*/
static void
spa_sync_deferred_frees(spa_t *spa, dmu_tx_t *tx)
{
zio_t *zio = zio_root(spa, NULL, NULL, 0);
VERIFY3U(bpobj_iterate(&spa->spa_deferred_bpobj,
spa_free_sync_cb, zio, tx), ==, 0);
VERIFY0(zio_wait(zio));
}
static void
spa_sync_nvlist(spa_t *spa, uint64_t obj, nvlist_t *nv, dmu_tx_t *tx)
{
char *packed = NULL;
size_t bufsize;
size_t nvsize = 0;
dmu_buf_t *db;
VERIFY(nvlist_size(nv, &nvsize, NV_ENCODE_XDR) == 0);
/*
* Write full (SPA_CONFIG_BLOCKSIZE) blocks of configuration
* information. This avoids the dbuf_will_dirty() path and
* saves us a pre-read to get data we don't actually care about.
*/
bufsize = P2ROUNDUP((uint64_t)nvsize, SPA_CONFIG_BLOCKSIZE);
packed = vmem_alloc(bufsize, KM_PUSHPAGE);
VERIFY(nvlist_pack(nv, &packed, &nvsize, NV_ENCODE_XDR,
KM_PUSHPAGE) == 0);
bzero(packed + nvsize, bufsize - nvsize);
dmu_write(spa->spa_meta_objset, obj, 0, bufsize, packed, tx);
vmem_free(packed, bufsize);
VERIFY(0 == dmu_bonus_hold(spa->spa_meta_objset, obj, FTAG, &db));
dmu_buf_will_dirty(db, tx);
*(uint64_t *)db->db_data = nvsize;
dmu_buf_rele(db, FTAG);
}
static void
spa_sync_aux_dev(spa_t *spa, spa_aux_vdev_t *sav, dmu_tx_t *tx,
const char *config, const char *entry)
{
nvlist_t *nvroot;
nvlist_t **list;
int i;
if (!sav->sav_sync)
return;
/*
* Update the MOS nvlist describing the list of available devices.
* spa_validate_aux() will have already made sure this nvlist is
* valid and the vdevs are labeled appropriately.
*/
if (sav->sav_object == 0) {
sav->sav_object = dmu_object_alloc(spa->spa_meta_objset,
DMU_OT_PACKED_NVLIST, 1 << 14, DMU_OT_PACKED_NVLIST_SIZE,
sizeof (uint64_t), tx);
VERIFY(zap_update(spa->spa_meta_objset,
DMU_POOL_DIRECTORY_OBJECT, entry, sizeof (uint64_t), 1,
&sav->sav_object, tx) == 0);
}
VERIFY(nvlist_alloc(&nvroot, NV_UNIQUE_NAME, KM_PUSHPAGE) == 0);
if (sav->sav_count == 0) {
VERIFY(nvlist_add_nvlist_array(nvroot, config, NULL, 0) == 0);
} else {
list = kmem_alloc(sav->sav_count * sizeof (void *), KM_PUSHPAGE);
for (i = 0; i < sav->sav_count; i++)
list[i] = vdev_config_generate(spa, sav->sav_vdevs[i],
B_FALSE, VDEV_CONFIG_L2CACHE);
VERIFY(nvlist_add_nvlist_array(nvroot, config, list,
sav->sav_count) == 0);
for (i = 0; i < sav->sav_count; i++)
nvlist_free(list[i]);
kmem_free(list, sav->sav_count * sizeof (void *));
}
spa_sync_nvlist(spa, sav->sav_object, nvroot, tx);
nvlist_free(nvroot);
sav->sav_sync = B_FALSE;
}
static void
spa_sync_config_object(spa_t *spa, dmu_tx_t *tx)
{
nvlist_t *config;
if (list_is_empty(&spa->spa_config_dirty_list))
return;
spa_config_enter(spa, SCL_STATE, FTAG, RW_READER);
config = spa_config_generate(spa, spa->spa_root_vdev,
dmu_tx_get_txg(tx), B_FALSE);
/*
* If we're upgrading the spa version then make sure that
* the config object gets updated with the correct version.
*/
if (spa->spa_ubsync.ub_version < spa->spa_uberblock.ub_version)
fnvlist_add_uint64(config, ZPOOL_CONFIG_VERSION,
spa->spa_uberblock.ub_version);
spa_config_exit(spa, SCL_STATE, FTAG);
if (spa->spa_config_syncing)
nvlist_free(spa->spa_config_syncing);
spa->spa_config_syncing = config;
spa_sync_nvlist(spa, spa->spa_config_object, config, tx);
}
static void
spa_sync_version(void *arg, dmu_tx_t *tx)
{
uint64_t *versionp = arg;
uint64_t version = *versionp;
spa_t *spa = dmu_tx_pool(tx)->dp_spa;
/*
* Setting the version is special cased when first creating the pool.
*/
ASSERT(tx->tx_txg != TXG_INITIAL);
ASSERT(SPA_VERSION_IS_SUPPORTED(version));
ASSERT(version >= spa_version(spa));
spa->spa_uberblock.ub_version = version;
vdev_config_dirty(spa->spa_root_vdev);
spa_history_log_internal(spa, "set", tx, "version=%lld", version);
}
/*
* Set zpool properties.
*/
static void
spa_sync_props(void *arg, dmu_tx_t *tx)
{
nvlist_t *nvp = arg;
spa_t *spa = dmu_tx_pool(tx)->dp_spa;
objset_t *mos = spa->spa_meta_objset;
nvpair_t *elem = NULL;
mutex_enter(&spa->spa_props_lock);
while ((elem = nvlist_next_nvpair(nvp, elem))) {
uint64_t intval;
char *strval, *fname;
zpool_prop_t prop;
const char *propname;
zprop_type_t proptype;
zfeature_info_t *feature;
prop = zpool_name_to_prop(nvpair_name(elem));
switch ((int)prop) {
case ZPROP_INVAL:
/*
* We checked this earlier in spa_prop_validate().
*/
ASSERT(zpool_prop_feature(nvpair_name(elem)));
fname = strchr(nvpair_name(elem), '@') + 1;
VERIFY3U(0, ==, zfeature_lookup_name(fname, &feature));
spa_feature_enable(spa, feature, tx);
spa_history_log_internal(spa, "set", tx,
"%s=enabled", nvpair_name(elem));
break;
case ZPOOL_PROP_VERSION:
VERIFY(nvpair_value_uint64(elem, &intval) == 0);
/*
* The version is synced seperatly before other
* properties and should be correct by now.
*/
ASSERT3U(spa_version(spa), >=, intval);
break;
case ZPOOL_PROP_ALTROOT:
/*
* 'altroot' is a non-persistent property. It should
* have been set temporarily at creation or import time.
*/
ASSERT(spa->spa_root != NULL);
break;
case ZPOOL_PROP_READONLY:
case ZPOOL_PROP_CACHEFILE:
/*
* 'readonly' and 'cachefile' are also non-persisitent
* properties.
*/
break;
case ZPOOL_PROP_COMMENT:
VERIFY(nvpair_value_string(elem, &strval) == 0);
if (spa->spa_comment != NULL)
spa_strfree(spa->spa_comment);
spa->spa_comment = spa_strdup(strval);
/*
* We need to dirty the configuration on all the vdevs
* so that their labels get updated. It's unnecessary
* to do this for pool creation since the vdev's
* configuratoin has already been dirtied.
*/
if (tx->tx_txg != TXG_INITIAL)
vdev_config_dirty(spa->spa_root_vdev);
spa_history_log_internal(spa, "set", tx,
"%s=%s", nvpair_name(elem), strval);
break;
default:
/*
* Set pool property values in the poolprops mos object.
*/
if (spa->spa_pool_props_object == 0) {
spa->spa_pool_props_object =
zap_create_link(mos, DMU_OT_POOL_PROPS,
DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_PROPS,
tx);
}
/* normalize the property name */
propname = zpool_prop_to_name(prop);
proptype = zpool_prop_get_type(prop);
if (nvpair_type(elem) == DATA_TYPE_STRING) {
ASSERT(proptype == PROP_TYPE_STRING);
VERIFY(nvpair_value_string(elem, &strval) == 0);
VERIFY(zap_update(mos,
spa->spa_pool_props_object, propname,
1, strlen(strval) + 1, strval, tx) == 0);
spa_history_log_internal(spa, "set", tx,
"%s=%s", nvpair_name(elem), strval);
} else if (nvpair_type(elem) == DATA_TYPE_UINT64) {
VERIFY(nvpair_value_uint64(elem, &intval) == 0);
if (proptype == PROP_TYPE_INDEX) {
const char *unused;
VERIFY(zpool_prop_index_to_string(
prop, intval, &unused) == 0);
}
VERIFY(zap_update(mos,
spa->spa_pool_props_object, propname,
8, 1, &intval, tx) == 0);
spa_history_log_internal(spa, "set", tx,
"%s=%lld", nvpair_name(elem), intval);
} else {
ASSERT(0); /* not allowed */
}
switch (prop) {
case ZPOOL_PROP_DELEGATION:
spa->spa_delegation = intval;
break;
case ZPOOL_PROP_BOOTFS:
spa->spa_bootfs = intval;
break;
case ZPOOL_PROP_FAILUREMODE:
spa->spa_failmode = intval;
break;
case ZPOOL_PROP_AUTOEXPAND:
spa->spa_autoexpand = intval;
if (tx->tx_txg != TXG_INITIAL)
spa_async_request(spa,
SPA_ASYNC_AUTOEXPAND);
break;
case ZPOOL_PROP_DEDUPDITTO:
spa->spa_dedup_ditto = intval;
break;
default:
break;
}
}
}
mutex_exit(&spa->spa_props_lock);
}
/*
* Perform one-time upgrade on-disk changes. spa_version() does not
* reflect the new version this txg, so there must be no changes this
* txg to anything that the upgrade code depends on after it executes.
* Therefore this must be called after dsl_pool_sync() does the sync
* tasks.
*/
static void
spa_sync_upgrades(spa_t *spa, dmu_tx_t *tx)
{
dsl_pool_t *dp = spa->spa_dsl_pool;
ASSERT(spa->spa_sync_pass == 1);
rrw_enter(&dp->dp_config_rwlock, RW_WRITER, FTAG);
if (spa->spa_ubsync.ub_version < SPA_VERSION_ORIGIN &&
spa->spa_uberblock.ub_version >= SPA_VERSION_ORIGIN) {
dsl_pool_create_origin(dp, tx);
/* Keeping the origin open increases spa_minref */
spa->spa_minref += 3;
}
if (spa->spa_ubsync.ub_version < SPA_VERSION_NEXT_CLONES &&
spa->spa_uberblock.ub_version >= SPA_VERSION_NEXT_CLONES) {
dsl_pool_upgrade_clones(dp, tx);
}
if (spa->spa_ubsync.ub_version < SPA_VERSION_DIR_CLONES &&
spa->spa_uberblock.ub_version >= SPA_VERSION_DIR_CLONES) {
dsl_pool_upgrade_dir_clones(dp, tx);
/* Keeping the freedir open increases spa_minref */
spa->spa_minref += 3;
}
if (spa->spa_ubsync.ub_version < SPA_VERSION_FEATURES &&
spa->spa_uberblock.ub_version >= SPA_VERSION_FEATURES) {
spa_feature_create_zap_objects(spa, tx);
}
rrw_exit(&dp->dp_config_rwlock, FTAG);
}
/*
* Sync the specified transaction group. New blocks may be dirtied as
* part of the process, so we iterate until it converges.
*/
void
spa_sync(spa_t *spa, uint64_t txg)
{
dsl_pool_t *dp = spa->spa_dsl_pool;
objset_t *mos = spa->spa_meta_objset;
bplist_t *free_bpl = &spa->spa_free_bplist[txg & TXG_MASK];
vdev_t *rvd = spa->spa_root_vdev;
vdev_t *vd;
dmu_tx_t *tx;
int error;
int c;
VERIFY(spa_writeable(spa));
/*
* Lock out configuration changes.
*/
spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER);
spa->spa_syncing_txg = txg;
spa->spa_sync_pass = 0;
/*
* If there are any pending vdev state changes, convert them
* into config changes that go out with this transaction group.
*/
spa_config_enter(spa, SCL_STATE, FTAG, RW_READER);
while (list_head(&spa->spa_state_dirty_list) != NULL) {
/*
* We need the write lock here because, for aux vdevs,
* calling vdev_config_dirty() modifies sav_config.
* This is ugly and will become unnecessary when we
* eliminate the aux vdev wart by integrating all vdevs
* into the root vdev tree.
*/
spa_config_exit(spa, SCL_CONFIG | SCL_STATE, FTAG);
spa_config_enter(spa, SCL_CONFIG | SCL_STATE, FTAG, RW_WRITER);
while ((vd = list_head(&spa->spa_state_dirty_list)) != NULL) {
vdev_state_clean(vd);
vdev_config_dirty(vd);
}
spa_config_exit(spa, SCL_CONFIG | SCL_STATE, FTAG);
spa_config_enter(spa, SCL_CONFIG | SCL_STATE, FTAG, RW_READER);
}
spa_config_exit(spa, SCL_STATE, FTAG);
tx = dmu_tx_create_assigned(dp, txg);
spa->spa_sync_starttime = gethrtime();
taskq_cancel_id(system_taskq, spa->spa_deadman_tqid);
spa->spa_deadman_tqid = taskq_dispatch_delay(system_taskq,
spa_deadman, spa, TQ_PUSHPAGE, ddi_get_lbolt() +
NSEC_TO_TICK(spa->spa_deadman_synctime));
/*
* If we are upgrading to SPA_VERSION_RAIDZ_DEFLATE this txg,
* set spa_deflate if we have no raid-z vdevs.
*/
if (spa->spa_ubsync.ub_version < SPA_VERSION_RAIDZ_DEFLATE &&
spa->spa_uberblock.ub_version >= SPA_VERSION_RAIDZ_DEFLATE) {
int i;
for (i = 0; i < rvd->vdev_children; i++) {
vd = rvd->vdev_child[i];
if (vd->vdev_deflate_ratio != SPA_MINBLOCKSIZE)
break;
}
if (i == rvd->vdev_children) {
spa->spa_deflate = TRUE;
VERIFY(0 == zap_add(spa->spa_meta_objset,
DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_DEFLATE,
sizeof (uint64_t), 1, &spa->spa_deflate, tx));
}
}
/*
* If anything has changed in this txg, or if someone is waiting
* for this txg to sync (eg, spa_vdev_remove()), push the
* deferred frees from the previous txg. If not, leave them
* alone so that we don't generate work on an otherwise idle
* system.
*/
if (!txg_list_empty(&dp->dp_dirty_datasets, txg) ||
!txg_list_empty(&dp->dp_dirty_dirs, txg) ||
!txg_list_empty(&dp->dp_sync_tasks, txg) ||
((dsl_scan_active(dp->dp_scan) ||
txg_sync_waiting(dp)) && !spa_shutting_down(spa))) {
spa_sync_deferred_frees(spa, tx);
}
/*
* Iterate to convergence.
*/
do {
int pass = ++spa->spa_sync_pass;
spa_sync_config_object(spa, tx);
spa_sync_aux_dev(spa, &spa->spa_spares, tx,
ZPOOL_CONFIG_SPARES, DMU_POOL_SPARES);
spa_sync_aux_dev(spa, &spa->spa_l2cache, tx,
ZPOOL_CONFIG_L2CACHE, DMU_POOL_L2CACHE);
spa_errlog_sync(spa, txg);
dsl_pool_sync(dp, txg);
if (pass < zfs_sync_pass_deferred_free) {
spa_sync_frees(spa, free_bpl, tx);
} else {
bplist_iterate(free_bpl, bpobj_enqueue_cb,
&spa->spa_deferred_bpobj, tx);
}
ddt_sync(spa, txg);
dsl_scan_sync(dp, tx);
while ((vd = txg_list_remove(&spa->spa_vdev_txg_list, txg)))
vdev_sync(vd, txg);
if (pass == 1)
spa_sync_upgrades(spa, tx);
} while (dmu_objset_is_dirty(mos, txg));
/*
* Rewrite the vdev configuration (which includes the uberblock)
* to commit the transaction group.
*
* If there are no dirty vdevs, we sync the uberblock to a few
* random top-level vdevs that are known to be visible in the
* config cache (see spa_vdev_add() for a complete description).
* If there *are* dirty vdevs, sync the uberblock to all vdevs.
*/
for (;;) {
/*
* We hold SCL_STATE to prevent vdev open/close/etc.
* while we're attempting to write the vdev labels.
*/
spa_config_enter(spa, SCL_STATE, FTAG, RW_READER);
if (list_is_empty(&spa->spa_config_dirty_list)) {
vdev_t *svd[SPA_DVAS_PER_BP];
int svdcount = 0;
int children = rvd->vdev_children;
int c0 = spa_get_random(children);
for (c = 0; c < children; c++) {
vd = rvd->vdev_child[(c0 + c) % children];
if (vd->vdev_ms_array == 0 || vd->vdev_islog)
continue;
svd[svdcount++] = vd;
if (svdcount == SPA_DVAS_PER_BP)
break;
}
error = vdev_config_sync(svd, svdcount, txg, B_FALSE);
if (error != 0)
error = vdev_config_sync(svd, svdcount, txg,
B_TRUE);
} else {
error = vdev_config_sync(rvd->vdev_child,
rvd->vdev_children, txg, B_FALSE);
if (error != 0)
error = vdev_config_sync(rvd->vdev_child,
rvd->vdev_children, txg, B_TRUE);
}
if (error == 0)
spa->spa_last_synced_guid = rvd->vdev_guid;
spa_config_exit(spa, SCL_STATE, FTAG);
if (error == 0)
break;
zio_suspend(spa, NULL);
zio_resume_wait(spa);
}
dmu_tx_commit(tx);
taskq_cancel_id(system_taskq, spa->spa_deadman_tqid);
spa->spa_deadman_tqid = 0;
/*
* Clear the dirty config list.
*/
while ((vd = list_head(&spa->spa_config_dirty_list)) != NULL)
vdev_config_clean(vd);
/*
* Now that the new config has synced transactionally,
* let it become visible to the config cache.
*/
if (spa->spa_config_syncing != NULL) {
spa_config_set(spa, spa->spa_config_syncing);
spa->spa_config_txg = txg;
spa->spa_config_syncing = NULL;
}
spa->spa_ubsync = spa->spa_uberblock;
dsl_pool_sync_done(dp, txg);
/*
* Update usable space statistics.
*/
while ((vd = txg_list_remove(&spa->spa_vdev_txg_list, TXG_CLEAN(txg))))
vdev_sync_done(vd, txg);
spa_update_dspace(spa);
/*
* It had better be the case that we didn't dirty anything
* since vdev_config_sync().
*/
ASSERT(txg_list_empty(&dp->dp_dirty_datasets, txg));
ASSERT(txg_list_empty(&dp->dp_dirty_dirs, txg));
ASSERT(txg_list_empty(&spa->spa_vdev_txg_list, txg));
spa->spa_sync_pass = 0;
spa_config_exit(spa, SCL_CONFIG, FTAG);
spa_handle_ignored_writes(spa);
/*
* If any async tasks have been requested, kick them off.
*/
spa_async_dispatch(spa);
}
/*
* Sync all pools. We don't want to hold the namespace lock across these
* operations, so we take a reference on the spa_t and drop the lock during the
* sync.
*/
void
spa_sync_allpools(void)
{
spa_t *spa = NULL;
mutex_enter(&spa_namespace_lock);
while ((spa = spa_next(spa)) != NULL) {
if (spa_state(spa) != POOL_STATE_ACTIVE ||
!spa_writeable(spa) || spa_suspended(spa))
continue;
spa_open_ref(spa, FTAG);
mutex_exit(&spa_namespace_lock);
txg_wait_synced(spa_get_dsl(spa), 0);
mutex_enter(&spa_namespace_lock);
spa_close(spa, FTAG);
}
mutex_exit(&spa_namespace_lock);
}
/*
* ==========================================================================
* Miscellaneous routines
* ==========================================================================
*/
/*
* Remove all pools in the system.
*/
void
spa_evict_all(void)
{
spa_t *spa;
/*
* Remove all cached state. All pools should be closed now,
* so every spa in the AVL tree should be unreferenced.
*/
mutex_enter(&spa_namespace_lock);
while ((spa = spa_next(NULL)) != NULL) {
/*
* Stop async tasks. The async thread may need to detach
* a device that's been replaced, which requires grabbing
* spa_namespace_lock, so we must drop it here.
*/
spa_open_ref(spa, FTAG);
mutex_exit(&spa_namespace_lock);
spa_async_suspend(spa);
mutex_enter(&spa_namespace_lock);
spa_close(spa, FTAG);
if (spa->spa_state != POOL_STATE_UNINITIALIZED) {
spa_unload(spa);
spa_deactivate(spa);
}
spa_remove(spa);
}
mutex_exit(&spa_namespace_lock);
}
vdev_t *
spa_lookup_by_guid(spa_t *spa, uint64_t guid, boolean_t aux)
{
vdev_t *vd;
int i;
if ((vd = vdev_lookup_by_guid(spa->spa_root_vdev, guid)) != NULL)
return (vd);
if (aux) {
for (i = 0; i < spa->spa_l2cache.sav_count; i++) {
vd = spa->spa_l2cache.sav_vdevs[i];
if (vd->vdev_guid == guid)
return (vd);
}
for (i = 0; i < spa->spa_spares.sav_count; i++) {
vd = spa->spa_spares.sav_vdevs[i];
if (vd->vdev_guid == guid)
return (vd);
}
}
return (NULL);
}
void
spa_upgrade(spa_t *spa, uint64_t version)
{
ASSERT(spa_writeable(spa));
spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
/*
* This should only be called for a non-faulted pool, and since a
* future version would result in an unopenable pool, this shouldn't be
* possible.
*/
ASSERT(SPA_VERSION_IS_SUPPORTED(spa->spa_uberblock.ub_version));
ASSERT(version >= spa->spa_uberblock.ub_version);
spa->spa_uberblock.ub_version = version;
vdev_config_dirty(spa->spa_root_vdev);
spa_config_exit(spa, SCL_ALL, FTAG);
txg_wait_synced(spa_get_dsl(spa), 0);
}
boolean_t
spa_has_spare(spa_t *spa, uint64_t guid)
{
int i;
uint64_t spareguid;
spa_aux_vdev_t *sav = &spa->spa_spares;
for (i = 0; i < sav->sav_count; i++)
if (sav->sav_vdevs[i]->vdev_guid == guid)
return (B_TRUE);
for (i = 0; i < sav->sav_npending; i++) {
if (nvlist_lookup_uint64(sav->sav_pending[i], ZPOOL_CONFIG_GUID,
&spareguid) == 0 && spareguid == guid)
return (B_TRUE);
}
return (B_FALSE);
}
/*
* Check if a pool has an active shared spare device.
* Note: reference count of an active spare is 2, as a spare and as a replace
*/
static boolean_t
spa_has_active_shared_spare(spa_t *spa)
{
int i, refcnt;
uint64_t pool;
spa_aux_vdev_t *sav = &spa->spa_spares;
for (i = 0; i < sav->sav_count; i++) {
if (spa_spare_exists(sav->sav_vdevs[i]->vdev_guid, &pool,
&refcnt) && pool != 0ULL && pool == spa_guid(spa) &&
refcnt > 2)
return (B_TRUE);
}
return (B_FALSE);
}
/*
* Post a FM_EREPORT_ZFS_* event from sys/fm/fs/zfs.h. The payload will be
* filled in from the spa and (optionally) the vdev. This doesn't do anything
* in the userland libzpool, as we don't want consumers to misinterpret ztest
* or zdb as real changes.
*/
void
spa_event_notify(spa_t *spa, vdev_t *vd, const char *name)
{
#ifdef _KERNEL
zfs_ereport_post(name, spa, vd, NULL, 0, 0);
#endif
}
#if defined(_KERNEL) && defined(HAVE_SPL)
/* state manipulation functions */
EXPORT_SYMBOL(spa_open);
EXPORT_SYMBOL(spa_open_rewind);
EXPORT_SYMBOL(spa_get_stats);
EXPORT_SYMBOL(spa_create);
EXPORT_SYMBOL(spa_import_rootpool);
EXPORT_SYMBOL(spa_import);
EXPORT_SYMBOL(spa_tryimport);
EXPORT_SYMBOL(spa_destroy);
EXPORT_SYMBOL(spa_export);
EXPORT_SYMBOL(spa_reset);
EXPORT_SYMBOL(spa_async_request);
EXPORT_SYMBOL(spa_async_suspend);
EXPORT_SYMBOL(spa_async_resume);
EXPORT_SYMBOL(spa_inject_addref);
EXPORT_SYMBOL(spa_inject_delref);
EXPORT_SYMBOL(spa_scan_stat_init);
EXPORT_SYMBOL(spa_scan_get_stats);
/* device maniion */
EXPORT_SYMBOL(spa_vdev_add);
EXPORT_SYMBOL(spa_vdev_attach);
EXPORT_SYMBOL(spa_vdev_detach);
EXPORT_SYMBOL(spa_vdev_remove);
EXPORT_SYMBOL(spa_vdev_setpath);
EXPORT_SYMBOL(spa_vdev_setfru);
EXPORT_SYMBOL(spa_vdev_split_mirror);
/* spare statech is global across all pools) */
EXPORT_SYMBOL(spa_spare_add);
EXPORT_SYMBOL(spa_spare_remove);
EXPORT_SYMBOL(spa_spare_exists);
EXPORT_SYMBOL(spa_spare_activate);
/* L2ARC statech is global across all pools) */
EXPORT_SYMBOL(spa_l2cache_add);
EXPORT_SYMBOL(spa_l2cache_remove);
EXPORT_SYMBOL(spa_l2cache_exists);
EXPORT_SYMBOL(spa_l2cache_activate);
EXPORT_SYMBOL(spa_l2cache_drop);
/* scanning */
EXPORT_SYMBOL(spa_scan);
EXPORT_SYMBOL(spa_scan_stop);
/* spa syncing */
EXPORT_SYMBOL(spa_sync); /* only for DMU use */
EXPORT_SYMBOL(spa_sync_allpools);
/* properties */
EXPORT_SYMBOL(spa_prop_set);
EXPORT_SYMBOL(spa_prop_get);
EXPORT_SYMBOL(spa_prop_clear_bootfs);
/* asynchronous event notification */
EXPORT_SYMBOL(spa_event_notify);
#endif
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