* CDDL HEADER END
*/
/*
- * Copyright 2009 Sun Microsystems, Inc. All rights reserved.
- * Use is subject to license terms.
+ * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2011, 2017 by Delphix. All rights reserved.
+ * Copyright (c) 2013 Steven Hartland. All rights reserved.
+ * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved.
+ * Copyright 2016 Nexenta Systems, Inc. All rights reserved.
*/
#include <sys/dsl_pool.h>
#include <sys/dsl_dataset.h>
+#include <sys/dsl_prop.h>
#include <sys/dsl_dir.h>
#include <sys/dsl_synctask.h>
+#include <sys/dsl_scan.h>
+#include <sys/dnode.h>
#include <sys/dmu_tx.h>
#include <sys/dmu_objset.h>
#include <sys/arc.h>
#include <sys/fs/zfs.h>
#include <sys/zfs_znode.h>
#include <sys/spa_impl.h>
+#include <sys/dsl_deadlist.h>
+#include <sys/vdev_impl.h>
+#include <sys/metaslab_impl.h>
+#include <sys/bptree.h>
+#include <sys/zfeature.h>
+#include <sys/zil_impl.h>
+#include <sys/dsl_userhold.h>
+#include <sys/trace_txg.h>
+#include <sys/mmp.h>
-int zfs_no_write_throttle = 0;
-int zfs_write_limit_shift = 3; /* 1/8th of physical memory */
-int zfs_txg_synctime = 5; /* target secs to sync a txg */
+/*
+ * ZFS Write Throttle
+ * ------------------
+ *
+ * ZFS must limit the rate of incoming writes to the rate at which it is able
+ * to sync data modifications to the backend storage. Throttling by too much
+ * creates an artificial limit; throttling by too little can only be sustained
+ * for short periods and would lead to highly lumpy performance. On a per-pool
+ * basis, ZFS tracks the amount of modified (dirty) data. As operations change
+ * data, the amount of dirty data increases; as ZFS syncs out data, the amount
+ * of dirty data decreases. When the amount of dirty data exceeds a
+ * predetermined threshold further modifications are blocked until the amount
+ * of dirty data decreases (as data is synced out).
+ *
+ * The limit on dirty data is tunable, and should be adjusted according to
+ * both the IO capacity and available memory of the system. The larger the
+ * window, the more ZFS is able to aggregate and amortize metadata (and data)
+ * changes. However, memory is a limited resource, and allowing for more dirty
+ * data comes at the cost of keeping other useful data in memory (for example
+ * ZFS data cached by the ARC).
+ *
+ * Implementation
+ *
+ * As buffers are modified dsl_pool_willuse_space() increments both the per-
+ * txg (dp_dirty_pertxg[]) and poolwide (dp_dirty_total) accounting of
+ * dirty space used; dsl_pool_dirty_space() decrements those values as data
+ * is synced out from dsl_pool_sync(). While only the poolwide value is
+ * relevant, the per-txg value is useful for debugging. The tunable
+ * zfs_dirty_data_max determines the dirty space limit. Once that value is
+ * exceeded, new writes are halted until space frees up.
+ *
+ * The zfs_dirty_data_sync_percent tunable dictates the threshold at which we
+ * ensure that there is a txg syncing (see the comment in txg.c for a full
+ * description of transaction group stages).
+ *
+ * The IO scheduler uses both the dirty space limit and current amount of
+ * dirty data as inputs. Those values affect the number of concurrent IOs ZFS
+ * issues. See the comment in vdev_queue.c for details of the IO scheduler.
+ *
+ * The delay is also calculated based on the amount of dirty data. See the
+ * comment above dmu_tx_delay() for details.
+ */
+
+/*
+ * zfs_dirty_data_max will be set to zfs_dirty_data_max_percent% of all memory,
+ * capped at zfs_dirty_data_max_max. It can also be overridden with a module
+ * parameter.
+ */
+unsigned long zfs_dirty_data_max = 0;
+unsigned long zfs_dirty_data_max_max = 0;
+int zfs_dirty_data_max_percent = 10;
+int zfs_dirty_data_max_max_percent = 25;
-uint64_t zfs_write_limit_min = 32 << 20; /* min write limit is 32MB */
-uint64_t zfs_write_limit_max = 0; /* max data payload per txg */
-uint64_t zfs_write_limit_inflated = 0;
-uint64_t zfs_write_limit_override = 0;
+/*
+ * If there's at least this much dirty data (as a percentage of
+ * zfs_dirty_data_max), push out a txg. This should be less than
+ * zfs_vdev_async_write_active_min_dirty_percent.
+ */
+int zfs_dirty_data_sync_percent = 20;
-kmutex_t zfs_write_limit_lock;
+/*
+ * Once there is this amount of dirty data, the dmu_tx_delay() will kick in
+ * and delay each transaction.
+ * This value should be >= zfs_vdev_async_write_active_max_dirty_percent.
+ */
+int zfs_delay_min_dirty_percent = 60;
-static pgcnt_t old_physmem = 0;
+/*
+ * This controls how quickly the delay approaches infinity.
+ * Larger values cause it to delay more for a given amount of dirty data.
+ * Therefore larger values will cause there to be less dirty data for a
+ * given throughput.
+ *
+ * For the smoothest delay, this value should be about 1 billion divided
+ * by the maximum number of operations per second. This will smoothly
+ * handle between 10x and 1/10th this number.
+ *
+ * Note: zfs_delay_scale * zfs_dirty_data_max must be < 2^64, due to the
+ * multiply in dmu_tx_delay().
+ */
+unsigned long zfs_delay_scale = 1000 * 1000 * 1000 / 2000;
-static int
+/*
+ * This determines the number of threads used by the dp_sync_taskq.
+ */
+int zfs_sync_taskq_batch_pct = 75;
+
+/*
+ * These tunables determine the behavior of how zil_itxg_clean() is
+ * called via zil_clean() in the context of spa_sync(). When an itxg
+ * list needs to be cleaned, TQ_NOSLEEP will be used when dispatching.
+ * If the dispatch fails, the call to zil_itxg_clean() will occur
+ * synchronously in the context of spa_sync(), which can negatively
+ * impact the performance of spa_sync() (e.g. in the case of the itxg
+ * list having a large number of itxs that needs to be cleaned).
+ *
+ * Thus, these tunables can be used to manipulate the behavior of the
+ * taskq used by zil_clean(); they determine the number of taskq entries
+ * that are pre-populated when the taskq is first created (via the
+ * "zfs_zil_clean_taskq_minalloc" tunable) and the maximum number of
+ * taskq entries that are cached after an on-demand allocation (via the
+ * "zfs_zil_clean_taskq_maxalloc").
+ *
+ * The idea being, we want to try reasonably hard to ensure there will
+ * already be a taskq entry pre-allocated by the time that it is needed
+ * by zil_clean(). This way, we can avoid the possibility of an
+ * on-demand allocation of a new taskq entry from failing, which would
+ * result in zil_itxg_clean() being called synchronously from zil_clean()
+ * (which can adversely affect performance of spa_sync()).
+ *
+ * Additionally, the number of threads used by the taskq can be
+ * configured via the "zfs_zil_clean_taskq_nthr_pct" tunable.
+ */
+int zfs_zil_clean_taskq_nthr_pct = 100;
+int zfs_zil_clean_taskq_minalloc = 1024;
+int zfs_zil_clean_taskq_maxalloc = 1024 * 1024;
+
+int
dsl_pool_open_special_dir(dsl_pool_t *dp, const char *name, dsl_dir_t **ddp)
{
uint64_t obj;
int err;
err = zap_lookup(dp->dp_meta_objset,
- dp->dp_root_dir->dd_phys->dd_child_dir_zapobj,
+ dsl_dir_phys(dp->dp_root_dir)->dd_child_dir_zapobj,
name, sizeof (obj), 1, &obj);
if (err)
return (err);
- return (dsl_dir_open_obj(dp, obj, name, dp, ddp));
+ return (dsl_dir_hold_obj(dp, obj, name, dp, ddp));
}
static dsl_pool_t *
dp = kmem_zalloc(sizeof (dsl_pool_t), KM_SLEEP);
dp->dp_spa = spa;
dp->dp_meta_rootbp = *bp;
- rw_init(&dp->dp_config_rwlock, NULL, RW_DEFAULT, NULL);
- dp->dp_write_limit = zfs_write_limit_min;
+ rrw_init(&dp->dp_config_rwlock, B_TRUE);
txg_init(dp, txg);
+ mmp_init(spa);
- txg_list_create(&dp->dp_dirty_datasets,
+ txg_list_create(&dp->dp_dirty_datasets, spa,
offsetof(dsl_dataset_t, ds_dirty_link));
- txg_list_create(&dp->dp_dirty_dirs,
+ txg_list_create(&dp->dp_dirty_zilogs, spa,
+ offsetof(zilog_t, zl_dirty_link));
+ txg_list_create(&dp->dp_dirty_dirs, spa,
offsetof(dsl_dir_t, dd_dirty_link));
- txg_list_create(&dp->dp_sync_tasks,
- offsetof(dsl_sync_task_group_t, dstg_node));
- list_create(&dp->dp_synced_datasets, sizeof (dsl_dataset_t),
- offsetof(dsl_dataset_t, ds_synced_link));
+ txg_list_create(&dp->dp_sync_tasks, spa,
+ offsetof(dsl_sync_task_t, dst_node));
+ txg_list_create(&dp->dp_early_sync_tasks, spa,
+ offsetof(dsl_sync_task_t, dst_node));
+
+ dp->dp_sync_taskq = taskq_create("dp_sync_taskq",
+ zfs_sync_taskq_batch_pct, minclsyspri, 1, INT_MAX,
+ TASKQ_THREADS_CPU_PCT);
+
+ dp->dp_zil_clean_taskq = taskq_create("dp_zil_clean_taskq",
+ zfs_zil_clean_taskq_nthr_pct, minclsyspri,
+ zfs_zil_clean_taskq_minalloc,
+ zfs_zil_clean_taskq_maxalloc,
+ TASKQ_PREPOPULATE | TASKQ_THREADS_CPU_PCT);
mutex_init(&dp->dp_lock, NULL, MUTEX_DEFAULT, NULL);
- mutex_init(&dp->dp_scrub_cancel_lock, NULL, MUTEX_DEFAULT, NULL);
+ cv_init(&dp->dp_spaceavail_cv, NULL, CV_DEFAULT, NULL);
- dp->dp_vnrele_taskq = taskq_create("zfs_vn_rele_taskq", 1, minclsyspri,
- 1, 4, 0);
+ dp->dp_iput_taskq = taskq_create("z_iput", max_ncpus, defclsyspri,
+ max_ncpus * 8, INT_MAX, TASKQ_PREPOPULATE | TASKQ_DYNAMIC);
return (dp);
}
int
-dsl_pool_open(spa_t *spa, uint64_t txg, dsl_pool_t **dpp)
+dsl_pool_init(spa_t *spa, uint64_t txg, dsl_pool_t **dpp)
{
int err;
dsl_pool_t *dp = dsl_pool_open_impl(spa, txg);
+
+ /*
+ * Initialize the caller's dsl_pool_t structure before we actually open
+ * the meta objset. This is done because a self-healing write zio may
+ * be issued as part of dmu_objset_open_impl() and the spa needs its
+ * dsl_pool_t initialized in order to handle the write.
+ */
+ *dpp = dp;
+
+ err = dmu_objset_open_impl(spa, NULL, &dp->dp_meta_rootbp,
+ &dp->dp_meta_objset);
+ if (err != 0) {
+ dsl_pool_close(dp);
+ *dpp = NULL;
+ }
+
+ return (err);
+}
+
+int
+dsl_pool_open(dsl_pool_t *dp)
+{
+ int err;
dsl_dir_t *dd;
dsl_dataset_t *ds;
- objset_impl_t *osi;
-
- rw_enter(&dp->dp_config_rwlock, RW_WRITER);
- err = dmu_objset_open_impl(spa, NULL, &dp->dp_meta_rootbp, &osi);
- if (err)
- goto out;
- dp->dp_meta_objset = &osi->os;
+ uint64_t obj;
+ rrw_enter(&dp->dp_config_rwlock, RW_WRITER, FTAG);
err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT,
DMU_POOL_ROOT_DATASET, sizeof (uint64_t), 1,
&dp->dp_root_dir_obj);
if (err)
goto out;
- err = dsl_dir_open_obj(dp, dp->dp_root_dir_obj,
+ err = dsl_dir_hold_obj(dp, dp->dp_root_dir_obj,
NULL, dp, &dp->dp_root_dir);
if (err)
goto out;
if (err)
goto out;
- if (spa_version(spa) >= SPA_VERSION_ORIGIN) {
+ if (spa_version(dp->dp_spa) >= SPA_VERSION_ORIGIN) {
err = dsl_pool_open_special_dir(dp, ORIGIN_DIR_NAME, &dd);
if (err)
goto out;
- err = dsl_dataset_hold_obj(dp, dd->dd_phys->dd_head_dataset_obj,
- FTAG, &ds);
+ err = dsl_dataset_hold_obj(dp,
+ dsl_dir_phys(dd)->dd_head_dataset_obj, FTAG, &ds);
if (err == 0) {
err = dsl_dataset_hold_obj(dp,
- ds->ds_phys->ds_prev_snap_obj, dp,
+ dsl_dataset_phys(ds)->ds_prev_snap_obj, dp,
&dp->dp_origin_snap);
dsl_dataset_rele(ds, FTAG);
}
- dsl_dir_close(dd, dp);
+ dsl_dir_rele(dd, dp);
if (err)
goto out;
}
- /* get scrub status */
- err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT,
- DMU_POOL_SCRUB_FUNC, sizeof (uint32_t), 1,
- &dp->dp_scrub_func);
- if (err == 0) {
- err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT,
- DMU_POOL_SCRUB_QUEUE, sizeof (uint64_t), 1,
- &dp->dp_scrub_queue_obj);
+ if (spa_version(dp->dp_spa) >= SPA_VERSION_DEADLISTS) {
+ err = dsl_pool_open_special_dir(dp, FREE_DIR_NAME,
+ &dp->dp_free_dir);
if (err)
goto out;
+
err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT,
- DMU_POOL_SCRUB_MIN_TXG, sizeof (uint64_t), 1,
- &dp->dp_scrub_min_txg);
+ DMU_POOL_FREE_BPOBJ, sizeof (uint64_t), 1, &obj);
if (err)
goto out;
+ VERIFY0(bpobj_open(&dp->dp_free_bpobj,
+ dp->dp_meta_objset, obj));
+ }
+
+ if (spa_feature_is_active(dp->dp_spa, SPA_FEATURE_OBSOLETE_COUNTS)) {
err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT,
- DMU_POOL_SCRUB_MAX_TXG, sizeof (uint64_t), 1,
- &dp->dp_scrub_max_txg);
- if (err)
+ DMU_POOL_OBSOLETE_BPOBJ, sizeof (uint64_t), 1, &obj);
+ if (err == 0) {
+ VERIFY0(bpobj_open(&dp->dp_obsolete_bpobj,
+ dp->dp_meta_objset, obj));
+ } else if (err == ENOENT) {
+ /*
+ * We might not have created the remap bpobj yet.
+ */
+ err = 0;
+ } else {
goto out;
+ }
+ }
+
+ /*
+ * Note: errors ignored, because the these special dirs, used for
+ * space accounting, are only created on demand.
+ */
+ (void) dsl_pool_open_special_dir(dp, LEAK_DIR_NAME,
+ &dp->dp_leak_dir);
+
+ if (spa_feature_is_active(dp->dp_spa, SPA_FEATURE_ASYNC_DESTROY)) {
err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT,
- DMU_POOL_SCRUB_BOOKMARK, sizeof (uint64_t), 4,
- &dp->dp_scrub_bookmark);
- if (err)
+ DMU_POOL_BPTREE_OBJ, sizeof (uint64_t), 1,
+ &dp->dp_bptree_obj);
+ if (err != 0)
goto out;
+ }
+
+ if (spa_feature_is_active(dp->dp_spa, SPA_FEATURE_EMPTY_BPOBJ)) {
err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT,
- DMU_POOL_SCRUB_ERRORS, sizeof (uint64_t), 1,
- &spa->spa_scrub_errors);
- if (err)
+ DMU_POOL_EMPTY_BPOBJ, sizeof (uint64_t), 1,
+ &dp->dp_empty_bpobj);
+ if (err != 0)
goto out;
- if (spa_version(spa) < SPA_VERSION_DSL_SCRUB) {
- /*
- * A new-type scrub was in progress on an old
- * pool. Restart from the beginning, since the
- * old software may have changed the pool in the
- * meantime.
- */
- dsl_pool_scrub_restart(dp);
- }
- } else {
- /*
- * It's OK if there is no scrub in progress (and if
- * there was an I/O error, ignore it).
- */
- err = 0;
}
-out:
- rw_exit(&dp->dp_config_rwlock);
+ err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT,
+ DMU_POOL_TMP_USERREFS, sizeof (uint64_t), 1,
+ &dp->dp_tmp_userrefs_obj);
+ if (err == ENOENT)
+ err = 0;
if (err)
- dsl_pool_close(dp);
- else
- *dpp = dp;
+ goto out;
+
+ err = dsl_scan_init(dp, dp->dp_tx.tx_open_txg);
+out:
+ rrw_exit(&dp->dp_config_rwlock, FTAG);
return (err);
}
void
dsl_pool_close(dsl_pool_t *dp)
{
- /* drop our references from dsl_pool_open() */
-
/*
+ * Drop our references from dsl_pool_open().
+ *
* Since we held the origin_snap from "syncing" context (which
* includes pool-opening context), it actually only got a "ref"
* and not a hold, so just drop that here.
*/
- if (dp->dp_origin_snap)
- dsl_dataset_drop_ref(dp->dp_origin_snap, dp);
- if (dp->dp_mos_dir)
- dsl_dir_close(dp->dp_mos_dir, dp);
- if (dp->dp_root_dir)
- dsl_dir_close(dp->dp_root_dir, dp);
+ if (dp->dp_origin_snap != NULL)
+ dsl_dataset_rele(dp->dp_origin_snap, dp);
+ if (dp->dp_mos_dir != NULL)
+ dsl_dir_rele(dp->dp_mos_dir, dp);
+ if (dp->dp_free_dir != NULL)
+ dsl_dir_rele(dp->dp_free_dir, dp);
+ if (dp->dp_leak_dir != NULL)
+ dsl_dir_rele(dp->dp_leak_dir, dp);
+ if (dp->dp_root_dir != NULL)
+ dsl_dir_rele(dp->dp_root_dir, dp);
+
+ bpobj_close(&dp->dp_free_bpobj);
+ bpobj_close(&dp->dp_obsolete_bpobj);
/* undo the dmu_objset_open_impl(mos) from dsl_pool_open() */
- if (dp->dp_meta_objset)
- dmu_objset_evict(NULL, dp->dp_meta_objset->os);
+ if (dp->dp_meta_objset != NULL)
+ dmu_objset_evict(dp->dp_meta_objset);
txg_list_destroy(&dp->dp_dirty_datasets);
+ txg_list_destroy(&dp->dp_dirty_zilogs);
+ txg_list_destroy(&dp->dp_sync_tasks);
+ txg_list_destroy(&dp->dp_early_sync_tasks);
txg_list_destroy(&dp->dp_dirty_dirs);
- list_destroy(&dp->dp_synced_datasets);
- arc_flush(dp->dp_spa);
+ taskq_destroy(dp->dp_zil_clean_taskq);
+ taskq_destroy(dp->dp_sync_taskq);
+
+ /*
+ * We can't set retry to TRUE since we're explicitly specifying
+ * a spa to flush. This is good enough; any missed buffers for
+ * this spa won't cause trouble, and they'll eventually fall
+ * out of the ARC just like any other unused buffer.
+ */
+ arc_flush(dp->dp_spa, FALSE);
+
+ mmp_fini(dp->dp_spa);
txg_fini(dp);
- rw_destroy(&dp->dp_config_rwlock);
+ dsl_scan_fini(dp);
+ dmu_buf_user_evict_wait();
+
+ rrw_destroy(&dp->dp_config_rwlock);
mutex_destroy(&dp->dp_lock);
- mutex_destroy(&dp->dp_scrub_cancel_lock);
- taskq_destroy(dp->dp_vnrele_taskq);
- if (dp->dp_blkstats)
- kmem_free(dp->dp_blkstats, sizeof (zfs_all_blkstats_t));
+ cv_destroy(&dp->dp_spaceavail_cv);
+ taskq_destroy(dp->dp_iput_taskq);
+ if (dp->dp_blkstats != NULL) {
+ mutex_destroy(&dp->dp_blkstats->zab_lock);
+ vmem_free(dp->dp_blkstats, sizeof (zfs_all_blkstats_t));
+ }
kmem_free(dp, sizeof (dsl_pool_t));
}
+void
+dsl_pool_create_obsolete_bpobj(dsl_pool_t *dp, dmu_tx_t *tx)
+{
+ uint64_t obj;
+ /*
+ * Currently, we only create the obsolete_bpobj where there are
+ * indirect vdevs with referenced mappings.
+ */
+ ASSERT(spa_feature_is_active(dp->dp_spa, SPA_FEATURE_DEVICE_REMOVAL));
+ /* create and open the obsolete_bpobj */
+ obj = bpobj_alloc(dp->dp_meta_objset, SPA_OLD_MAXBLOCKSIZE, tx);
+ VERIFY0(bpobj_open(&dp->dp_obsolete_bpobj, dp->dp_meta_objset, obj));
+ VERIFY0(zap_add(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT,
+ DMU_POOL_OBSOLETE_BPOBJ, sizeof (uint64_t), 1, &obj, tx));
+ spa_feature_incr(dp->dp_spa, SPA_FEATURE_OBSOLETE_COUNTS, tx);
+}
+
+void
+dsl_pool_destroy_obsolete_bpobj(dsl_pool_t *dp, dmu_tx_t *tx)
+{
+ spa_feature_decr(dp->dp_spa, SPA_FEATURE_OBSOLETE_COUNTS, tx);
+ VERIFY0(zap_remove(dp->dp_meta_objset,
+ DMU_POOL_DIRECTORY_OBJECT,
+ DMU_POOL_OBSOLETE_BPOBJ, tx));
+ bpobj_free(dp->dp_meta_objset,
+ dp->dp_obsolete_bpobj.bpo_object, tx);
+ bpobj_close(&dp->dp_obsolete_bpobj);
+}
+
dsl_pool_t *
-dsl_pool_create(spa_t *spa, nvlist_t *zplprops, uint64_t txg)
+dsl_pool_create(spa_t *spa, nvlist_t *zplprops, dsl_crypto_params_t *dcp,
+ uint64_t txg)
{
int err;
dsl_pool_t *dp = dsl_pool_open_impl(spa, txg);
dmu_tx_t *tx = dmu_tx_create_assigned(dp, txg);
- objset_impl_t *osip;
+#ifdef _KERNEL
+ objset_t *os;
+#else
+ objset_t *os __attribute__((unused));
+#endif
dsl_dataset_t *ds;
- uint64_t dsobj;
+ uint64_t obj;
+
+ rrw_enter(&dp->dp_config_rwlock, RW_WRITER, FTAG);
/* create and open the MOS (meta-objset) */
- dp->dp_meta_objset = &dmu_objset_create_impl(spa,
- NULL, &dp->dp_meta_rootbp, DMU_OST_META, tx)->os;
+ dp->dp_meta_objset = dmu_objset_create_impl(spa,
+ NULL, &dp->dp_meta_rootbp, DMU_OST_META, tx);
+ spa->spa_meta_objset = dp->dp_meta_objset;
/* create the pool directory */
err = zap_create_claim(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT,
DMU_OT_OBJECT_DIRECTORY, DMU_OT_NONE, 0, tx);
- ASSERT3U(err, ==, 0);
+ ASSERT0(err);
+
+ /* Initialize scan structures */
+ VERIFY0(dsl_scan_init(dp, txg));
/* create and open the root dir */
dp->dp_root_dir_obj = dsl_dir_create_sync(dp, NULL, NULL, tx);
- VERIFY(0 == dsl_dir_open_obj(dp, dp->dp_root_dir_obj,
+ VERIFY0(dsl_dir_hold_obj(dp, dp->dp_root_dir_obj,
NULL, dp, &dp->dp_root_dir));
/* create and open the meta-objset dir */
(void) dsl_dir_create_sync(dp, dp->dp_root_dir, MOS_DIR_NAME, tx);
- VERIFY(0 == dsl_pool_open_special_dir(dp,
+ VERIFY0(dsl_pool_open_special_dir(dp,
MOS_DIR_NAME, &dp->dp_mos_dir));
+ if (spa_version(spa) >= SPA_VERSION_DEADLISTS) {
+ /* create and open the free dir */
+ (void) dsl_dir_create_sync(dp, dp->dp_root_dir,
+ FREE_DIR_NAME, tx);
+ VERIFY0(dsl_pool_open_special_dir(dp,
+ FREE_DIR_NAME, &dp->dp_free_dir));
+
+ /* create and open the free_bplist */
+ obj = bpobj_alloc(dp->dp_meta_objset, SPA_OLD_MAXBLOCKSIZE, tx);
+ VERIFY(zap_add(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT,
+ DMU_POOL_FREE_BPOBJ, sizeof (uint64_t), 1, &obj, tx) == 0);
+ VERIFY0(bpobj_open(&dp->dp_free_bpobj,
+ dp->dp_meta_objset, obj));
+ }
+
if (spa_version(spa) >= SPA_VERSION_DSL_SCRUB)
dsl_pool_create_origin(dp, tx);
+ /*
+ * Some features may be needed when creating the root dataset, so we
+ * create the feature objects here.
+ */
+ if (spa_version(spa) >= SPA_VERSION_FEATURES)
+ spa_feature_create_zap_objects(spa, tx);
+
+ if (dcp != NULL && dcp->cp_crypt != ZIO_CRYPT_OFF &&
+ dcp->cp_crypt != ZIO_CRYPT_INHERIT)
+ spa_feature_enable(spa, SPA_FEATURE_ENCRYPTION, tx);
+
/* create the root dataset */
- dsobj = dsl_dataset_create_sync_dd(dp->dp_root_dir, NULL, 0, tx);
+ obj = dsl_dataset_create_sync_dd(dp->dp_root_dir, NULL, dcp, 0, tx);
/* create the root objset */
- VERIFY(0 == dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds));
- osip = dmu_objset_create_impl(dp->dp_spa, ds,
+ VERIFY0(dsl_dataset_hold_obj_flags(dp, obj,
+ DS_HOLD_FLAG_DECRYPT, FTAG, &ds));
+ rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG);
+ os = dmu_objset_create_impl(dp->dp_spa, ds,
dsl_dataset_get_blkptr(ds), DMU_OST_ZFS, tx);
+ rrw_exit(&ds->ds_bp_rwlock, FTAG);
#ifdef _KERNEL
- zfs_create_fs(&osip->os, kcred, zplprops, tx);
+ zfs_create_fs(os, kcred, zplprops, tx);
#endif
- dsl_dataset_rele(ds, FTAG);
+ dsl_dataset_rele_flags(ds, DS_HOLD_FLAG_DECRYPT, FTAG);
dmu_tx_commit(tx);
+ rrw_exit(&dp->dp_config_rwlock, FTAG);
+
return (dp);
}
+/*
+ * Account for the meta-objset space in its placeholder dsl_dir.
+ */
+void
+dsl_pool_mos_diduse_space(dsl_pool_t *dp,
+ int64_t used, int64_t comp, int64_t uncomp)
+{
+ ASSERT3U(comp, ==, uncomp); /* it's all metadata */
+ mutex_enter(&dp->dp_lock);
+ dp->dp_mos_used_delta += used;
+ dp->dp_mos_compressed_delta += comp;
+ dp->dp_mos_uncompressed_delta += uncomp;
+ mutex_exit(&dp->dp_lock);
+}
+
+static void
+dsl_pool_sync_mos(dsl_pool_t *dp, dmu_tx_t *tx)
+{
+ zio_t *zio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED);
+ dmu_objset_sync(dp->dp_meta_objset, zio, tx);
+ VERIFY0(zio_wait(zio));
+ dprintf_bp(&dp->dp_meta_rootbp, "meta objset rootbp is %s", "");
+ spa_set_rootblkptr(dp->dp_spa, &dp->dp_meta_rootbp);
+}
+
+static void
+dsl_pool_dirty_delta(dsl_pool_t *dp, int64_t delta)
+{
+ ASSERT(MUTEX_HELD(&dp->dp_lock));
+
+ if (delta < 0)
+ ASSERT3U(-delta, <=, dp->dp_dirty_total);
+
+ dp->dp_dirty_total += delta;
+
+ /*
+ * Note: we signal even when increasing dp_dirty_total.
+ * This ensures forward progress -- each thread wakes the next waiter.
+ */
+ if (dp->dp_dirty_total < zfs_dirty_data_max)
+ cv_signal(&dp->dp_spaceavail_cv);
+}
+
+#ifdef ZFS_DEBUG
+static boolean_t
+dsl_early_sync_task_verify(dsl_pool_t *dp, uint64_t txg)
+{
+ spa_t *spa = dp->dp_spa;
+ vdev_t *rvd = spa->spa_root_vdev;
+
+ for (uint64_t c = 0; c < rvd->vdev_children; c++) {
+ vdev_t *vd = rvd->vdev_child[c];
+ txg_list_t *tl = &vd->vdev_ms_list;
+ metaslab_t *ms;
+
+ for (ms = txg_list_head(tl, TXG_CLEAN(txg)); ms;
+ ms = txg_list_next(tl, ms, TXG_CLEAN(txg))) {
+ VERIFY(range_tree_is_empty(ms->ms_freeing));
+ VERIFY(range_tree_is_empty(ms->ms_checkpointing));
+ }
+ }
+
+ return (B_TRUE);
+}
+#endif
+
void
dsl_pool_sync(dsl_pool_t *dp, uint64_t txg)
{
dmu_tx_t *tx;
dsl_dir_t *dd;
dsl_dataset_t *ds;
- dsl_sync_task_group_t *dstg;
- objset_impl_t *mosi = dp->dp_meta_objset->os;
- hrtime_t start, write_time;
- uint64_t data_written;
- int err;
+ objset_t *mos = dp->dp_meta_objset;
+ list_t synced_datasets;
+
+ list_create(&synced_datasets, sizeof (dsl_dataset_t),
+ offsetof(dsl_dataset_t, ds_synced_link));
tx = dmu_tx_create_assigned(dp, txg);
- dp->dp_read_overhead = 0;
- start = gethrtime();
+ /*
+ * Run all early sync tasks before writing out any dirty blocks.
+ * For more info on early sync tasks see block comment in
+ * dsl_early_sync_task().
+ */
+ if (!txg_list_empty(&dp->dp_early_sync_tasks, txg)) {
+ dsl_sync_task_t *dst;
+
+ ASSERT3U(spa_sync_pass(dp->dp_spa), ==, 1);
+ while ((dst =
+ txg_list_remove(&dp->dp_early_sync_tasks, txg)) != NULL) {
+ ASSERT(dsl_early_sync_task_verify(dp, txg));
+ dsl_sync_task_sync(dst, tx);
+ }
+ ASSERT(dsl_early_sync_task_verify(dp, txg));
+ }
+ /*
+ * Write out all dirty blocks of dirty datasets.
+ */
zio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED);
- while (ds = txg_list_remove(&dp->dp_dirty_datasets, txg)) {
+ while ((ds = txg_list_remove(&dp->dp_dirty_datasets, txg)) != NULL) {
/*
* We must not sync any non-MOS datasets twice, because
* we may have taken a snapshot of them. However, we
* may sync newly-created datasets on pass 2.
*/
ASSERT(!list_link_active(&ds->ds_synced_link));
- list_insert_tail(&dp->dp_synced_datasets, ds);
+ list_insert_tail(&synced_datasets, ds);
dsl_dataset_sync(ds, zio, tx);
}
- DTRACE_PROBE(pool_sync__1setup);
- err = zio_wait(zio);
+ VERIFY0(zio_wait(zio));
- write_time = gethrtime() - start;
- ASSERT(err == 0);
- DTRACE_PROBE(pool_sync__2rootzio);
+ /*
+ * We have written all of the accounted dirty data, so our
+ * dp_space_towrite should now be zero. However, some seldom-used
+ * code paths do not adhere to this (e.g. dbuf_undirty(), also
+ * rounding error in dbuf_write_physdone).
+ * Shore up the accounting of any dirtied space now.
+ */
+ dsl_pool_undirty_space(dp, dp->dp_dirty_pertxg[txg & TXG_MASK], txg);
+
+ /*
+ * Update the long range free counter after
+ * we're done syncing user data
+ */
+ mutex_enter(&dp->dp_lock);
+ ASSERT(spa_sync_pass(dp->dp_spa) == 1 ||
+ dp->dp_long_free_dirty_pertxg[txg & TXG_MASK] == 0);
+ dp->dp_long_free_dirty_pertxg[txg & TXG_MASK] = 0;
+ mutex_exit(&dp->dp_lock);
- for (ds = list_head(&dp->dp_synced_datasets); ds;
- ds = list_next(&dp->dp_synced_datasets, ds))
- dmu_objset_do_userquota_callbacks(ds->ds_user_ptr, tx);
+ /*
+ * After the data blocks have been written (ensured by the zio_wait()
+ * above), update the user/group/project space accounting. This happens
+ * in tasks dispatched to dp_sync_taskq, so wait for them before
+ * continuing.
+ */
+ for (ds = list_head(&synced_datasets); ds != NULL;
+ ds = list_next(&synced_datasets, ds)) {
+ dmu_objset_do_userquota_updates(ds->ds_objset, tx);
+ }
+ taskq_wait(dp->dp_sync_taskq);
/*
* Sync the datasets again to push out the changes due to
- * userquota updates. This must be done before we process the
- * sync tasks, because that could cause a snapshot of a dataset
- * whose ds_bp will be rewritten when we do this 2nd sync.
+ * userspace updates. This must be done before we process the
+ * sync tasks, so that any snapshots will have the correct
+ * user accounting information (and we won't get confused
+ * about which blocks are part of the snapshot).
*/
zio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED);
- while (ds = txg_list_remove(&dp->dp_dirty_datasets, txg)) {
+ while ((ds = txg_list_remove(&dp->dp_dirty_datasets, txg)) != NULL) {
+ objset_t *os = ds->ds_objset;
+
ASSERT(list_link_active(&ds->ds_synced_link));
dmu_buf_rele(ds->ds_dbuf, ds);
dsl_dataset_sync(ds, zio, tx);
- }
- err = zio_wait(zio);
- while (dstg = txg_list_remove(&dp->dp_sync_tasks, txg)) {
/*
- * No more sync tasks should have been added while we
- * were syncing.
+ * Release any key mappings created by calls to
+ * dsl_dataset_dirty() from the userquota accounting
+ * code paths.
*/
- ASSERT(spa_sync_pass(dp->dp_spa) == 1);
- dsl_sync_task_group_sync(dstg, tx);
+ if (os->os_encrypted && !os->os_raw_receive &&
+ !os->os_next_write_raw[txg & TXG_MASK]) {
+ ASSERT3P(ds->ds_key_mapping, !=, NULL);
+ key_mapping_rele(dp->dp_spa, ds->ds_key_mapping, ds);
+ }
}
- DTRACE_PROBE(pool_sync__3task);
+ VERIFY0(zio_wait(zio));
- start = gethrtime();
- while (dd = txg_list_remove(&dp->dp_dirty_dirs, txg))
- dsl_dir_sync(dd, tx);
- write_time += gethrtime() - start;
-
- if (spa_sync_pass(dp->dp_spa) == 1)
- dsl_pool_scrub_sync(dp, tx);
-
- start = gethrtime();
- if (list_head(&mosi->os_dirty_dnodes[txg & TXG_MASK]) != NULL ||
- list_head(&mosi->os_free_dnodes[txg & TXG_MASK]) != NULL) {
- zio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED);
- dmu_objset_sync(mosi, zio, tx);
- err = zio_wait(zio);
- ASSERT(err == 0);
- dprintf_bp(&dp->dp_meta_rootbp, "meta objset rootbp is %s", "");
- spa_set_rootblkptr(dp->dp_spa, &dp->dp_meta_rootbp);
- }
- write_time += gethrtime() - start;
- DTRACE_PROBE2(pool_sync__4io, hrtime_t, write_time,
- hrtime_t, dp->dp_read_overhead);
- write_time -= dp->dp_read_overhead;
+ /*
+ * Now that the datasets have been completely synced, we can
+ * clean up our in-memory structures accumulated while syncing:
+ *
+ * - move dead blocks from the pending deadlist to the on-disk deadlist
+ * - release hold from dsl_dataset_dirty()
+ * - release key mapping hold from dsl_dataset_dirty()
+ */
+ while ((ds = list_remove_head(&synced_datasets)) != NULL) {
+ objset_t *os = ds->ds_objset;
- dmu_tx_commit(tx);
+ if (os->os_encrypted && !os->os_raw_receive &&
+ !os->os_next_write_raw[txg & TXG_MASK]) {
+ ASSERT3P(ds->ds_key_mapping, !=, NULL);
+ key_mapping_rele(dp->dp_spa, ds->ds_key_mapping, ds);
+ }
- data_written = dp->dp_space_towrite[txg & TXG_MASK];
- dp->dp_space_towrite[txg & TXG_MASK] = 0;
- ASSERT(dp->dp_tempreserved[txg & TXG_MASK] == 0);
+ dsl_dataset_sync_done(ds, tx);
+ }
+
+ while ((dd = txg_list_remove(&dp->dp_dirty_dirs, txg)) != NULL) {
+ dsl_dir_sync(dd, tx);
+ }
/*
- * If the write limit max has not been explicitly set, set it
- * to a fraction of available physical memory (default 1/8th).
- * Note that we must inflate the limit because the spa
- * inflates write sizes to account for data replication.
- * Check this each sync phase to catch changing memory size.
+ * The MOS's space is accounted for in the pool/$MOS
+ * (dp_mos_dir). We can't modify the mos while we're syncing
+ * it, so we remember the deltas and apply them here.
*/
- if (physmem != old_physmem && zfs_write_limit_shift) {
- mutex_enter(&zfs_write_limit_lock);
- old_physmem = physmem;
- zfs_write_limit_max = ptob(physmem) >> zfs_write_limit_shift;
- zfs_write_limit_inflated = MAX(zfs_write_limit_min,
- spa_get_asize(dp->dp_spa, zfs_write_limit_max));
- mutex_exit(&zfs_write_limit_lock);
+ if (dp->dp_mos_used_delta != 0 || dp->dp_mos_compressed_delta != 0 ||
+ dp->dp_mos_uncompressed_delta != 0) {
+ dsl_dir_diduse_space(dp->dp_mos_dir, DD_USED_HEAD,
+ dp->dp_mos_used_delta,
+ dp->dp_mos_compressed_delta,
+ dp->dp_mos_uncompressed_delta, tx);
+ dp->dp_mos_used_delta = 0;
+ dp->dp_mos_compressed_delta = 0;
+ dp->dp_mos_uncompressed_delta = 0;
+ }
+
+ if (!multilist_is_empty(mos->os_dirty_dnodes[txg & TXG_MASK])) {
+ dsl_pool_sync_mos(dp, tx);
}
/*
- * Attempt to keep the sync time consistent by adjusting the
- * amount of write traffic allowed into each transaction group.
- * Weight the throughput calculation towards the current value:
- * thru = 3/4 old_thru + 1/4 new_thru
+ * If we modify a dataset in the same txg that we want to destroy it,
+ * its dsl_dir's dd_dbuf will be dirty, and thus have a hold on it.
+ * dsl_dir_destroy_check() will fail if there are unexpected holds.
+ * Therefore, we want to sync the MOS (thus syncing the dd_dbuf
+ * and clearing the hold on it) before we process the sync_tasks.
+ * The MOS data dirtied by the sync_tasks will be synced on the next
+ * pass.
*/
- ASSERT(zfs_write_limit_min > 0);
- if (data_written > zfs_write_limit_min / 8 && write_time > 0) {
- uint64_t throughput = (data_written * NANOSEC) / write_time;
- if (dp->dp_throughput)
- dp->dp_throughput = throughput / 4 +
- 3 * dp->dp_throughput / 4;
- else
- dp->dp_throughput = throughput;
- dp->dp_write_limit = MIN(zfs_write_limit_inflated,
- MAX(zfs_write_limit_min,
- dp->dp_throughput * zfs_txg_synctime));
+ if (!txg_list_empty(&dp->dp_sync_tasks, txg)) {
+ dsl_sync_task_t *dst;
+ /*
+ * No more sync tasks should have been added while we
+ * were syncing.
+ */
+ ASSERT3U(spa_sync_pass(dp->dp_spa), ==, 1);
+ while ((dst = txg_list_remove(&dp->dp_sync_tasks, txg)) != NULL)
+ dsl_sync_task_sync(dst, tx);
}
+
+ dmu_tx_commit(tx);
+
+ DTRACE_PROBE2(dsl_pool_sync__done, dsl_pool_t *dp, dp, uint64_t, txg);
}
void
-dsl_pool_zil_clean(dsl_pool_t *dp)
+dsl_pool_sync_done(dsl_pool_t *dp, uint64_t txg)
{
- dsl_dataset_t *ds;
+ zilog_t *zilog;
- while (ds = list_head(&dp->dp_synced_datasets)) {
- list_remove(&dp->dp_synced_datasets, ds);
- ASSERT(ds->ds_user_ptr != NULL);
- zil_clean(((objset_impl_t *)ds->ds_user_ptr)->os_zil);
- dmu_buf_rele(ds->ds_dbuf, ds);
+ while ((zilog = txg_list_head(&dp->dp_dirty_zilogs, txg))) {
+ dsl_dataset_t *ds = dmu_objset_ds(zilog->zl_os);
+ /*
+ * We don't remove the zilog from the dp_dirty_zilogs
+ * list until after we've cleaned it. This ensures that
+ * callers of zilog_is_dirty() receive an accurate
+ * answer when they are racing with the spa sync thread.
+ */
+ zil_clean(zilog, txg);
+ (void) txg_list_remove_this(&dp->dp_dirty_zilogs, zilog, txg);
+ ASSERT(!dmu_objset_is_dirty(zilog->zl_os, txg));
+ dmu_buf_rele(ds->ds_dbuf, zilog);
}
+ ASSERT(!dmu_objset_is_dirty(dp->dp_meta_objset, txg));
}
/*
dsl_pool_sync_context(dsl_pool_t *dp)
{
return (curthread == dp->dp_tx.tx_sync_thread ||
- spa_get_dsl(dp->dp_spa) == NULL);
+ spa_is_initializing(dp->dp_spa) ||
+ taskq_member(dp->dp_sync_taskq, curthread));
}
+/*
+ * This function returns the amount of allocatable space in the pool
+ * minus whatever space is currently reserved by ZFS for specific
+ * purposes. Specifically:
+ *
+ * 1] Any reserved SLOP space
+ * 2] Any space used by the checkpoint
+ * 3] Any space used for deferred frees
+ *
+ * The latter 2 are especially important because they are needed to
+ * rectify the SPA's and DMU's different understanding of how much space
+ * is used. Now the DMU is aware of that extra space tracked by the SPA
+ * without having to maintain a separate special dir (e.g similar to
+ * $MOS, $FREEING, and $LEAKED).
+ *
+ * Note: By deferred frees here, we mean the frees that were deferred
+ * in spa_sync() after sync pass 1 (spa_deferred_bpobj), and not the
+ * segments placed in ms_defer trees during metaslab_sync_done().
+ */
uint64_t
-dsl_pool_adjustedsize(dsl_pool_t *dp, boolean_t netfree)
+dsl_pool_adjustedsize(dsl_pool_t *dp, zfs_space_check_t slop_policy)
{
- uint64_t space, resv;
-
- /*
- * Reserve about 1.6% (1/64), or at least 32MB, for allocation
- * efficiency.
- * XXX The intent log is not accounted for, so it must fit
- * within this slop.
- *
- * If we're trying to assess whether it's OK to do a free,
- * cut the reservation in half to allow forward progress
- * (e.g. make it possible to rm(1) files from a full pool).
- */
- space = spa_get_dspace(dp->dp_spa);
- resv = MAX(space >> 6, SPA_MINDEVSIZE >> 1);
- if (netfree)
+ spa_t *spa = dp->dp_spa;
+ uint64_t space, resv, adjustedsize;
+ uint64_t spa_deferred_frees =
+ spa->spa_deferred_bpobj.bpo_phys->bpo_bytes;
+
+ space = spa_get_dspace(spa)
+ - spa_get_checkpoint_space(spa) - spa_deferred_frees;
+ resv = spa_get_slop_space(spa);
+
+ switch (slop_policy) {
+ case ZFS_SPACE_CHECK_NORMAL:
+ break;
+ case ZFS_SPACE_CHECK_RESERVED:
resv >>= 1;
+ break;
+ case ZFS_SPACE_CHECK_EXTRA_RESERVED:
+ resv >>= 2;
+ break;
+ case ZFS_SPACE_CHECK_NONE:
+ resv = 0;
+ break;
+ default:
+ panic("invalid slop policy value: %d", slop_policy);
+ break;
+ }
+ adjustedsize = (space >= resv) ? (space - resv) : 0;
- return (space - resv);
+ return (adjustedsize);
}
-int
-dsl_pool_tempreserve_space(dsl_pool_t *dp, uint64_t space, dmu_tx_t *tx)
+uint64_t
+dsl_pool_unreserved_space(dsl_pool_t *dp, zfs_space_check_t slop_policy)
{
- uint64_t reserved = 0;
- uint64_t write_limit = (zfs_write_limit_override ?
- zfs_write_limit_override : dp->dp_write_limit);
-
- if (zfs_no_write_throttle) {
- atomic_add_64(&dp->dp_tempreserved[tx->tx_txg & TXG_MASK],
- space);
- return (0);
- }
-
- /*
- * Check to see if we have exceeded the maximum allowed IO for
- * this transaction group. We can do this without locks since
- * a little slop here is ok. Note that we do the reserved check
- * with only half the requested reserve: this is because the
- * reserve requests are worst-case, and we really don't want to
- * throttle based off of worst-case estimates.
- */
- if (write_limit > 0) {
- reserved = dp->dp_space_towrite[tx->tx_txg & TXG_MASK]
- + dp->dp_tempreserved[tx->tx_txg & TXG_MASK] / 2;
-
- if (reserved && reserved > write_limit)
- return (ERESTART);
- }
-
- atomic_add_64(&dp->dp_tempreserved[tx->tx_txg & TXG_MASK], space);
-
- /*
- * If this transaction group is over 7/8ths capacity, delay
- * the caller 1 clock tick. This will slow down the "fill"
- * rate until the sync process can catch up with us.
- */
- if (reserved && reserved > (write_limit - (write_limit >> 3)))
- txg_delay(dp, tx->tx_txg, 1);
-
- return (0);
+ uint64_t poolsize = dsl_pool_adjustedsize(dp, slop_policy);
+ uint64_t deferred =
+ metaslab_class_get_deferred(spa_normal_class(dp->dp_spa));
+ uint64_t quota = (poolsize >= deferred) ? (poolsize - deferred) : 0;
+ return (quota);
}
-void
-dsl_pool_tempreserve_clear(dsl_pool_t *dp, int64_t space, dmu_tx_t *tx)
+boolean_t
+dsl_pool_need_dirty_delay(dsl_pool_t *dp)
{
- ASSERT(dp->dp_tempreserved[tx->tx_txg & TXG_MASK] >= space);
- atomic_add_64(&dp->dp_tempreserved[tx->tx_txg & TXG_MASK], -space);
+ uint64_t delay_min_bytes =
+ zfs_dirty_data_max * zfs_delay_min_dirty_percent / 100;
+ uint64_t dirty_min_bytes =
+ zfs_dirty_data_max * zfs_dirty_data_sync_percent / 100;
+ boolean_t rv;
+
+ mutex_enter(&dp->dp_lock);
+ if (dp->dp_dirty_total > dirty_min_bytes)
+ txg_kick(dp);
+ rv = (dp->dp_dirty_total > delay_min_bytes);
+ mutex_exit(&dp->dp_lock);
+ return (rv);
}
void
-dsl_pool_memory_pressure(dsl_pool_t *dp)
+dsl_pool_dirty_space(dsl_pool_t *dp, int64_t space, dmu_tx_t *tx)
{
- uint64_t space_inuse = 0;
- int i;
-
- if (dp->dp_write_limit == zfs_write_limit_min)
- return;
-
- for (i = 0; i < TXG_SIZE; i++) {
- space_inuse += dp->dp_space_towrite[i];
- space_inuse += dp->dp_tempreserved[i];
+ if (space > 0) {
+ mutex_enter(&dp->dp_lock);
+ dp->dp_dirty_pertxg[tx->tx_txg & TXG_MASK] += space;
+ dsl_pool_dirty_delta(dp, space);
+ mutex_exit(&dp->dp_lock);
}
- dp->dp_write_limit = MAX(zfs_write_limit_min,
- MIN(dp->dp_write_limit, space_inuse / 4));
}
void
-dsl_pool_willuse_space(dsl_pool_t *dp, int64_t space, dmu_tx_t *tx)
+dsl_pool_undirty_space(dsl_pool_t *dp, int64_t space, uint64_t txg)
{
- if (space > 0) {
- mutex_enter(&dp->dp_lock);
- dp->dp_space_towrite[tx->tx_txg & TXG_MASK] += space;
- mutex_exit(&dp->dp_lock);
+ ASSERT3S(space, >=, 0);
+ if (space == 0)
+ return;
+
+ mutex_enter(&dp->dp_lock);
+ if (dp->dp_dirty_pertxg[txg & TXG_MASK] < space) {
+ /* XXX writing something we didn't dirty? */
+ space = dp->dp_dirty_pertxg[txg & TXG_MASK];
}
+ ASSERT3U(dp->dp_dirty_pertxg[txg & TXG_MASK], >=, space);
+ dp->dp_dirty_pertxg[txg & TXG_MASK] -= space;
+ ASSERT3U(dp->dp_dirty_total, >=, space);
+ dsl_pool_dirty_delta(dp, -space);
+ mutex_exit(&dp->dp_lock);
}
/* ARGSUSED */
static int
-upgrade_clones_cb(spa_t *spa, uint64_t dsobj, const char *dsname, void *arg)
+upgrade_clones_cb(dsl_pool_t *dp, dsl_dataset_t *hds, void *arg)
{
dmu_tx_t *tx = arg;
dsl_dataset_t *ds, *prev = NULL;
int err;
- dsl_pool_t *dp = spa_get_dsl(spa);
- err = dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds);
+ err = dsl_dataset_hold_obj(dp, hds->ds_object, FTAG, &ds);
if (err)
return (err);
- while (ds->ds_phys->ds_prev_snap_obj != 0) {
- err = dsl_dataset_hold_obj(dp, ds->ds_phys->ds_prev_snap_obj,
- FTAG, &prev);
+ while (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) {
+ err = dsl_dataset_hold_obj(dp,
+ dsl_dataset_phys(ds)->ds_prev_snap_obj, FTAG, &prev);
if (err) {
dsl_dataset_rele(ds, FTAG);
return (err);
}
- if (prev->ds_phys->ds_next_snap_obj != ds->ds_object)
+ if (dsl_dataset_phys(prev)->ds_next_snap_obj != ds->ds_object)
break;
dsl_dataset_rele(ds, FTAG);
ds = prev;
* The $ORIGIN can't have any data, or the accounting
* will be wrong.
*/
- ASSERT(prev->ds_phys->ds_bp.blk_birth == 0);
+ rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG);
+ ASSERT0(dsl_dataset_phys(prev)->ds_bp.blk_birth);
+ rrw_exit(&ds->ds_bp_rwlock, FTAG);
/* The origin doesn't get attached to itself */
if (ds->ds_object == prev->ds_object) {
}
dmu_buf_will_dirty(ds->ds_dbuf, tx);
- ds->ds_phys->ds_prev_snap_obj = prev->ds_object;
- ds->ds_phys->ds_prev_snap_txg = prev->ds_phys->ds_creation_txg;
+ dsl_dataset_phys(ds)->ds_prev_snap_obj = prev->ds_object;
+ dsl_dataset_phys(ds)->ds_prev_snap_txg =
+ dsl_dataset_phys(prev)->ds_creation_txg;
dmu_buf_will_dirty(ds->ds_dir->dd_dbuf, tx);
- ds->ds_dir->dd_phys->dd_origin_obj = prev->ds_object;
+ dsl_dir_phys(ds->ds_dir)->dd_origin_obj = prev->ds_object;
dmu_buf_will_dirty(prev->ds_dbuf, tx);
- prev->ds_phys->ds_num_children++;
+ dsl_dataset_phys(prev)->ds_num_children++;
- if (ds->ds_phys->ds_next_snap_obj == 0) {
+ if (dsl_dataset_phys(ds)->ds_next_snap_obj == 0) {
ASSERT(ds->ds_prev == NULL);
- VERIFY(0 == dsl_dataset_hold_obj(dp,
- ds->ds_phys->ds_prev_snap_obj, ds, &ds->ds_prev));
+ VERIFY0(dsl_dataset_hold_obj(dp,
+ dsl_dataset_phys(ds)->ds_prev_snap_obj,
+ ds, &ds->ds_prev));
}
}
- ASSERT(ds->ds_dir->dd_phys->dd_origin_obj == prev->ds_object);
- ASSERT(ds->ds_phys->ds_prev_snap_obj == prev->ds_object);
+ ASSERT3U(dsl_dir_phys(ds->ds_dir)->dd_origin_obj, ==, prev->ds_object);
+ ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_obj, ==, prev->ds_object);
- if (prev->ds_phys->ds_next_clones_obj == 0) {
- prev->ds_phys->ds_next_clones_obj =
+ if (dsl_dataset_phys(prev)->ds_next_clones_obj == 0) {
+ dmu_buf_will_dirty(prev->ds_dbuf, tx);
+ dsl_dataset_phys(prev)->ds_next_clones_obj =
zap_create(dp->dp_meta_objset,
DMU_OT_NEXT_CLONES, DMU_OT_NONE, 0, tx);
}
- VERIFY(0 == zap_add_int(dp->dp_meta_objset,
- prev->ds_phys->ds_next_clones_obj, ds->ds_object, tx));
+ VERIFY0(zap_add_int(dp->dp_meta_objset,
+ dsl_dataset_phys(prev)->ds_next_clones_obj, ds->ds_object, tx));
dsl_dataset_rele(ds, FTAG);
if (prev != dp->dp_origin_snap)
ASSERT(dmu_tx_is_syncing(tx));
ASSERT(dp->dp_origin_snap != NULL);
- (void) dmu_objset_find_spa(dp->dp_spa, NULL, upgrade_clones_cb,
- tx, DS_FIND_CHILDREN);
+ VERIFY0(dmu_objset_find_dp(dp, dp->dp_root_dir_obj, upgrade_clones_cb,
+ tx, DS_FIND_CHILDREN | DS_FIND_SERIALIZE));
+}
+
+/* ARGSUSED */
+static int
+upgrade_dir_clones_cb(dsl_pool_t *dp, dsl_dataset_t *ds, void *arg)
+{
+ dmu_tx_t *tx = arg;
+ objset_t *mos = dp->dp_meta_objset;
+
+ if (dsl_dir_phys(ds->ds_dir)->dd_origin_obj != 0) {
+ dsl_dataset_t *origin;
+
+ VERIFY0(dsl_dataset_hold_obj(dp,
+ dsl_dir_phys(ds->ds_dir)->dd_origin_obj, FTAG, &origin));
+
+ if (dsl_dir_phys(origin->ds_dir)->dd_clones == 0) {
+ dmu_buf_will_dirty(origin->ds_dir->dd_dbuf, tx);
+ dsl_dir_phys(origin->ds_dir)->dd_clones =
+ zap_create(mos, DMU_OT_DSL_CLONES, DMU_OT_NONE,
+ 0, tx);
+ }
+
+ VERIFY0(zap_add_int(dp->dp_meta_objset,
+ dsl_dir_phys(origin->ds_dir)->dd_clones,
+ ds->ds_object, tx));
+
+ dsl_dataset_rele(origin, FTAG);
+ }
+ return (0);
+}
+
+void
+dsl_pool_upgrade_dir_clones(dsl_pool_t *dp, dmu_tx_t *tx)
+{
+ uint64_t obj;
+
+ ASSERT(dmu_tx_is_syncing(tx));
+
+ (void) dsl_dir_create_sync(dp, dp->dp_root_dir, FREE_DIR_NAME, tx);
+ VERIFY0(dsl_pool_open_special_dir(dp,
+ FREE_DIR_NAME, &dp->dp_free_dir));
+
+ /*
+ * We can't use bpobj_alloc(), because spa_version() still
+ * returns the old version, and we need a new-version bpobj with
+ * subobj support. So call dmu_object_alloc() directly.
+ */
+ obj = dmu_object_alloc(dp->dp_meta_objset, DMU_OT_BPOBJ,
+ SPA_OLD_MAXBLOCKSIZE, DMU_OT_BPOBJ_HDR, sizeof (bpobj_phys_t), tx);
+ VERIFY0(zap_add(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT,
+ DMU_POOL_FREE_BPOBJ, sizeof (uint64_t), 1, &obj, tx));
+ VERIFY0(bpobj_open(&dp->dp_free_bpobj, dp->dp_meta_objset, obj));
+
+ VERIFY0(dmu_objset_find_dp(dp, dp->dp_root_dir_obj,
+ upgrade_dir_clones_cb, tx, DS_FIND_CHILDREN | DS_FIND_SERIALIZE));
}
void
ASSERT(dmu_tx_is_syncing(tx));
ASSERT(dp->dp_origin_snap == NULL);
+ ASSERT(rrw_held(&dp->dp_config_rwlock, RW_WRITER));
/* create the origin dir, ds, & snap-ds */
- rw_enter(&dp->dp_config_rwlock, RW_WRITER);
dsobj = dsl_dataset_create_sync(dp->dp_root_dir, ORIGIN_DIR_NAME,
- NULL, 0, kcred, tx);
- VERIFY(0 == dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds));
- dsl_dataset_snapshot_sync(ds, ORIGIN_DIR_NAME, kcred, tx);
- VERIFY(0 == dsl_dataset_hold_obj(dp, ds->ds_phys->ds_prev_snap_obj,
+ NULL, 0, kcred, NULL, tx);
+ VERIFY0(dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds));
+ dsl_dataset_snapshot_sync_impl(ds, ORIGIN_DIR_NAME, tx);
+ VERIFY0(dsl_dataset_hold_obj(dp, dsl_dataset_phys(ds)->ds_prev_snap_obj,
dp, &dp->dp_origin_snap));
dsl_dataset_rele(ds, FTAG);
- rw_exit(&dp->dp_config_rwlock);
}
taskq_t *
-dsl_pool_vnrele_taskq(dsl_pool_t *dp)
+dsl_pool_iput_taskq(dsl_pool_t *dp)
+{
+ return (dp->dp_iput_taskq);
+}
+
+/*
+ * Walk through the pool-wide zap object of temporary snapshot user holds
+ * and release them.
+ */
+void
+dsl_pool_clean_tmp_userrefs(dsl_pool_t *dp)
+{
+ zap_attribute_t za;
+ zap_cursor_t zc;
+ objset_t *mos = dp->dp_meta_objset;
+ uint64_t zapobj = dp->dp_tmp_userrefs_obj;
+ nvlist_t *holds;
+
+ if (zapobj == 0)
+ return;
+ ASSERT(spa_version(dp->dp_spa) >= SPA_VERSION_USERREFS);
+
+ holds = fnvlist_alloc();
+
+ for (zap_cursor_init(&zc, mos, zapobj);
+ zap_cursor_retrieve(&zc, &za) == 0;
+ zap_cursor_advance(&zc)) {
+ char *htag;
+ nvlist_t *tags;
+
+ htag = strchr(za.za_name, '-');
+ *htag = '\0';
+ ++htag;
+ if (nvlist_lookup_nvlist(holds, za.za_name, &tags) != 0) {
+ tags = fnvlist_alloc();
+ fnvlist_add_boolean(tags, htag);
+ fnvlist_add_nvlist(holds, za.za_name, tags);
+ fnvlist_free(tags);
+ } else {
+ fnvlist_add_boolean(tags, htag);
+ }
+ }
+ dsl_dataset_user_release_tmp(dp, holds);
+ fnvlist_free(holds);
+ zap_cursor_fini(&zc);
+}
+
+/*
+ * Create the pool-wide zap object for storing temporary snapshot holds.
+ */
+void
+dsl_pool_user_hold_create_obj(dsl_pool_t *dp, dmu_tx_t *tx)
+{
+ objset_t *mos = dp->dp_meta_objset;
+
+ ASSERT(dp->dp_tmp_userrefs_obj == 0);
+ ASSERT(dmu_tx_is_syncing(tx));
+
+ dp->dp_tmp_userrefs_obj = zap_create_link(mos, DMU_OT_USERREFS,
+ DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_TMP_USERREFS, tx);
+}
+
+static int
+dsl_pool_user_hold_rele_impl(dsl_pool_t *dp, uint64_t dsobj,
+ const char *tag, uint64_t now, dmu_tx_t *tx, boolean_t holding)
+{
+ objset_t *mos = dp->dp_meta_objset;
+ uint64_t zapobj = dp->dp_tmp_userrefs_obj;
+ char *name;
+ int error;
+
+ ASSERT(spa_version(dp->dp_spa) >= SPA_VERSION_USERREFS);
+ ASSERT(dmu_tx_is_syncing(tx));
+
+ /*
+ * If the pool was created prior to SPA_VERSION_USERREFS, the
+ * zap object for temporary holds might not exist yet.
+ */
+ if (zapobj == 0) {
+ if (holding) {
+ dsl_pool_user_hold_create_obj(dp, tx);
+ zapobj = dp->dp_tmp_userrefs_obj;
+ } else {
+ return (SET_ERROR(ENOENT));
+ }
+ }
+
+ name = kmem_asprintf("%llx-%s", (u_longlong_t)dsobj, tag);
+ if (holding)
+ error = zap_add(mos, zapobj, name, 8, 1, &now, tx);
+ else
+ error = zap_remove(mos, zapobj, name, tx);
+ strfree(name);
+
+ return (error);
+}
+
+/*
+ * Add a temporary hold for the given dataset object and tag.
+ */
+int
+dsl_pool_user_hold(dsl_pool_t *dp, uint64_t dsobj, const char *tag,
+ uint64_t now, dmu_tx_t *tx)
+{
+ return (dsl_pool_user_hold_rele_impl(dp, dsobj, tag, now, tx, B_TRUE));
+}
+
+/*
+ * Release a temporary hold for the given dataset object and tag.
+ */
+int
+dsl_pool_user_release(dsl_pool_t *dp, uint64_t dsobj, const char *tag,
+ dmu_tx_t *tx)
+{
+ return (dsl_pool_user_hold_rele_impl(dp, dsobj, tag, 0,
+ tx, B_FALSE));
+}
+
+/*
+ * DSL Pool Configuration Lock
+ *
+ * The dp_config_rwlock protects against changes to DSL state (e.g. dataset
+ * creation / destruction / rename / property setting). It must be held for
+ * read to hold a dataset or dsl_dir. I.e. you must call
+ * dsl_pool_config_enter() or dsl_pool_hold() before calling
+ * dsl_{dataset,dir}_hold{_obj}. In most circumstances, the dp_config_rwlock
+ * must be held continuously until all datasets and dsl_dirs are released.
+ *
+ * The only exception to this rule is that if a "long hold" is placed on
+ * a dataset, then the dp_config_rwlock may be dropped while the dataset
+ * is still held. The long hold will prevent the dataset from being
+ * destroyed -- the destroy will fail with EBUSY. A long hold can be
+ * obtained by calling dsl_dataset_long_hold(), or by "owning" a dataset
+ * (by calling dsl_{dataset,objset}_{try}own{_obj}).
+ *
+ * Legitimate long-holders (including owners) should be long-running, cancelable
+ * tasks that should cause "zfs destroy" to fail. This includes DMU
+ * consumers (i.e. a ZPL filesystem being mounted or ZVOL being open),
+ * "zfs send", and "zfs diff". There are several other long-holders whose
+ * uses are suboptimal (e.g. "zfs promote", and zil_suspend()).
+ *
+ * The usual formula for long-holding would be:
+ * dsl_pool_hold()
+ * dsl_dataset_hold()
+ * ... perform checks ...
+ * dsl_dataset_long_hold()
+ * dsl_pool_rele()
+ * ... perform long-running task ...
+ * dsl_dataset_long_rele()
+ * dsl_dataset_rele()
+ *
+ * Note that when the long hold is released, the dataset is still held but
+ * the pool is not held. The dataset may change arbitrarily during this time
+ * (e.g. it could be destroyed). Therefore you shouldn't do anything to the
+ * dataset except release it.
+ *
+ * User-initiated operations (e.g. ioctls, zfs_ioc_*()) are either read-only
+ * or modifying operations.
+ *
+ * Modifying operations should generally use dsl_sync_task(). The synctask
+ * infrastructure enforces proper locking strategy with respect to the
+ * dp_config_rwlock. See the comment above dsl_sync_task() for details.
+ *
+ * Read-only operations will manually hold the pool, then the dataset, obtain
+ * information from the dataset, then release the pool and dataset.
+ * dmu_objset_{hold,rele}() are convenience routines that also do the pool
+ * hold/rele.
+ */
+
+int
+dsl_pool_hold(const char *name, void *tag, dsl_pool_t **dp)
+{
+ spa_t *spa;
+ int error;
+
+ error = spa_open(name, &spa, tag);
+ if (error == 0) {
+ *dp = spa_get_dsl(spa);
+ dsl_pool_config_enter(*dp, tag);
+ }
+ return (error);
+}
+
+void
+dsl_pool_rele(dsl_pool_t *dp, void *tag)
+{
+ dsl_pool_config_exit(dp, tag);
+ spa_close(dp->dp_spa, tag);
+}
+
+void
+dsl_pool_config_enter(dsl_pool_t *dp, void *tag)
+{
+ /*
+ * We use a "reentrant" reader-writer lock, but not reentrantly.
+ *
+ * The rrwlock can (with the track_all flag) track all reading threads,
+ * which is very useful for debugging which code path failed to release
+ * the lock, and for verifying that the *current* thread does hold
+ * the lock.
+ *
+ * (Unlike a rwlock, which knows that N threads hold it for
+ * read, but not *which* threads, so rw_held(RW_READER) returns TRUE
+ * if any thread holds it for read, even if this thread doesn't).
+ */
+ ASSERT(!rrw_held(&dp->dp_config_rwlock, RW_READER));
+ rrw_enter(&dp->dp_config_rwlock, RW_READER, tag);
+}
+
+void
+dsl_pool_config_enter_prio(dsl_pool_t *dp, void *tag)
+{
+ ASSERT(!rrw_held(&dp->dp_config_rwlock, RW_READER));
+ rrw_enter_read_prio(&dp->dp_config_rwlock, tag);
+}
+
+void
+dsl_pool_config_exit(dsl_pool_t *dp, void *tag)
+{
+ rrw_exit(&dp->dp_config_rwlock, tag);
+}
+
+boolean_t
+dsl_pool_config_held(dsl_pool_t *dp)
{
- return (dp->dp_vnrele_taskq);
+ return (RRW_LOCK_HELD(&dp->dp_config_rwlock));
}
+
+boolean_t
+dsl_pool_config_held_writer(dsl_pool_t *dp)
+{
+ return (RRW_WRITE_HELD(&dp->dp_config_rwlock));
+}
+
+#if defined(_KERNEL)
+EXPORT_SYMBOL(dsl_pool_config_enter);
+EXPORT_SYMBOL(dsl_pool_config_exit);
+
+/* BEGIN CSTYLED */
+/* zfs_dirty_data_max_percent only applied at module load in arc_init(). */
+module_param(zfs_dirty_data_max_percent, int, 0444);
+MODULE_PARM_DESC(zfs_dirty_data_max_percent, "percent of ram can be dirty");
+
+/* zfs_dirty_data_max_max_percent only applied at module load in arc_init(). */
+module_param(zfs_dirty_data_max_max_percent, int, 0444);
+MODULE_PARM_DESC(zfs_dirty_data_max_max_percent,
+ "zfs_dirty_data_max upper bound as % of RAM");
+
+module_param(zfs_delay_min_dirty_percent, int, 0644);
+MODULE_PARM_DESC(zfs_delay_min_dirty_percent, "transaction delay threshold");
+
+module_param(zfs_dirty_data_max, ulong, 0644);
+MODULE_PARM_DESC(zfs_dirty_data_max, "determines the dirty space limit");
+
+/* zfs_dirty_data_max_max only applied at module load in arc_init(). */
+module_param(zfs_dirty_data_max_max, ulong, 0444);
+MODULE_PARM_DESC(zfs_dirty_data_max_max,
+ "zfs_dirty_data_max upper bound in bytes");
+
+module_param(zfs_dirty_data_sync_percent, int, 0644);
+MODULE_PARM_DESC(zfs_dirty_data_sync_percent,
+ "dirty data txg sync threshold as a percentage of zfs_dirty_data_max");
+
+module_param(zfs_delay_scale, ulong, 0644);
+MODULE_PARM_DESC(zfs_delay_scale, "how quickly delay approaches infinity");
+
+module_param(zfs_sync_taskq_batch_pct, int, 0644);
+MODULE_PARM_DESC(zfs_sync_taskq_batch_pct,
+ "max percent of CPUs that are used to sync dirty data");
+
+module_param(zfs_zil_clean_taskq_nthr_pct, int, 0644);
+MODULE_PARM_DESC(zfs_zil_clean_taskq_nthr_pct,
+ "max percent of CPUs that are used per dp_sync_taskq");
+
+module_param(zfs_zil_clean_taskq_minalloc, int, 0644);
+MODULE_PARM_DESC(zfs_zil_clean_taskq_minalloc,
+ "number of taskq entries that are pre-populated");
+
+module_param(zfs_zil_clean_taskq_maxalloc, int, 0644);
+MODULE_PARM_DESC(zfs_zil_clean_taskq_maxalloc,
+ "max number of taskq entries that are cached");
+
+/* END CSTYLED */
+#endif
projects / zfs / blobdiff