diff options
Diffstat (limited to 'module/zfs/dsl_pool.c')
| -rw-r--r-- | module/zfs/dsl_pool.c | 614 |
1 files changed, 614 insertions, 0 deletions
diff --git a/module/zfs/dsl_pool.c b/module/zfs/dsl_pool.c new file mode 100644 index 000000000..f4275ea06 --- /dev/null +++ b/module/zfs/dsl_pool.c @@ -0,0 +1,614 @@ +/* + * 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 2008 Sun Microsystems, Inc. All rights reserved. + * Use is subject to license terms. + */ + +#include <sys/dsl_pool.h> +#include <sys/dsl_dataset.h> +#include <sys/dsl_dir.h> +#include <sys/dsl_synctask.h> +#include <sys/dmu_tx.h> +#include <sys/dmu_objset.h> +#include <sys/arc.h> +#include <sys/zap.h> +#include <sys/zio.h> +#include <sys/zfs_context.h> +#include <sys/fs/zfs.h> +#include <sys/zfs_znode.h> +#include <sys/spa_impl.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 */ + +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; + +kmutex_t zfs_write_limit_lock; + +static pgcnt_t old_physmem = 0; + +static 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, + name, sizeof (obj), 1, &obj); + if (err) + return (err); + + return (dsl_dir_open_obj(dp, obj, name, dp, ddp)); +} + +static dsl_pool_t * +dsl_pool_open_impl(spa_t *spa, uint64_t txg) +{ + dsl_pool_t *dp; + blkptr_t *bp = spa_get_rootblkptr(spa); + + 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; + txg_init(dp, txg); + + txg_list_create(&dp->dp_dirty_datasets, + offsetof(dsl_dataset_t, ds_dirty_link)); + txg_list_create(&dp->dp_dirty_dirs, + 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)); + + mutex_init(&dp->dp_lock, NULL, MUTEX_DEFAULT, NULL); + mutex_init(&dp->dp_scrub_cancel_lock, NULL, MUTEX_DEFAULT, NULL); + + return (dp); +} + +int +dsl_pool_open(spa_t *spa, uint64_t txg, dsl_pool_t **dpp) +{ + int err; + dsl_pool_t *dp = dsl_pool_open_impl(spa, txg); + 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; + + 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, + NULL, dp, &dp->dp_root_dir); + if (err) + goto out; + + err = dsl_pool_open_special_dir(dp, MOS_DIR_NAME, &dp->dp_mos_dir); + if (err) + goto out; + + if (spa_version(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); + if (err) + goto out; + err = dsl_dataset_hold_obj(dp, ds->ds_phys->ds_prev_snap_obj, + dp, &dp->dp_origin_snap); + if (err) + goto out; + dsl_dataset_rele(ds, FTAG); + dsl_dir_close(dd, dp); + } + + /* 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 (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); + if (err) + goto out; + 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) + goto out; + 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) + goto out; + 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) + 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); + if (err) + dsl_pool_close(dp); + else + *dpp = dp; + + return (err); +} + +void +dsl_pool_close(dsl_pool_t *dp) +{ + /* 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); + + /* 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); + + txg_list_destroy(&dp->dp_dirty_datasets); + txg_list_destroy(&dp->dp_dirty_dirs); + txg_list_destroy(&dp->dp_sync_tasks); + list_destroy(&dp->dp_synced_datasets); + + arc_flush(dp->dp_spa); + txg_fini(dp); + rw_destroy(&dp->dp_config_rwlock); + mutex_destroy(&dp->dp_lock); + mutex_destroy(&dp->dp_scrub_cancel_lock); + if (dp->dp_blkstats) + kmem_free(dp->dp_blkstats, sizeof (zfs_all_blkstats_t)); + kmem_free(dp, sizeof (dsl_pool_t)); +} + +dsl_pool_t * +dsl_pool_create(spa_t *spa, nvlist_t *zplprops, 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; + dsl_dataset_t *ds; + uint64_t dsobj; + + /* 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; + + /* 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); + + /* 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, + 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, + MOS_DIR_NAME, &dp->dp_mos_dir)); + + if (spa_version(spa) >= SPA_VERSION_DSL_SCRUB) + dsl_pool_create_origin(dp, tx); + + /* create the root dataset */ + dsobj = dsl_dataset_create_sync_dd(dp->dp_root_dir, NULL, 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, + dsl_dataset_get_blkptr(ds), DMU_OST_ZFS, tx); +#ifdef _KERNEL + zfs_create_fs(&osip->os, kcred, zplprops, tx); +#endif + dsl_dataset_rele(ds, FTAG); + + dmu_tx_commit(tx); + + return (dp); +} + +void +dsl_pool_sync(dsl_pool_t *dp, uint64_t txg) +{ + zio_t *zio; + 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; + + tx = dmu_tx_create_assigned(dp, txg); + + dp->dp_read_overhead = 0; + zio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED); + while ((ds = txg_list_remove(&dp->dp_dirty_datasets, txg))) { + if (!list_link_active(&ds->ds_synced_link)) + list_insert_tail(&dp->dp_synced_datasets, ds); + else + dmu_buf_rele(ds->ds_dbuf, ds); + dsl_dataset_sync(ds, zio, tx); + } + DTRACE_PROBE(pool_sync__1setup); + + start = gethrtime(); + err = zio_wait(zio); + write_time = gethrtime() - start; + ASSERT(err == 0); + DTRACE_PROBE(pool_sync__2rootzio); + + while (dstg = txg_list_remove(&dp->dp_sync_tasks, txg)) + dsl_sync_task_group_sync(dstg, tx); + DTRACE_PROBE(pool_sync__3task); + + 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; + + dmu_tx_commit(tx); + + 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); + + /* + * 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. + */ + 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); + } + + /* + * 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 + */ + 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)); + } +} + +void +dsl_pool_zil_clean(dsl_pool_t *dp) +{ + dsl_dataset_t *ds; + + 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); + } +} + +/* + * TRUE if the current thread is the tx_sync_thread or if we + * are being called from SPA context during pool initialization. + */ +int +dsl_pool_sync_context(dsl_pool_t *dp) +{ + return (curthread == dp->dp_tx.tx_sync_thread || + spa_get_dsl(dp->dp_spa) == NULL); +} + +uint64_t +dsl_pool_adjustedsize(dsl_pool_t *dp, boolean_t netfree) +{ + 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) + resv >>= 1; + + return (space - resv); +} + +int +dsl_pool_tempreserve_space(dsl_pool_t *dp, uint64_t space, dmu_tx_t *tx) +{ + 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); +} + +void +dsl_pool_tempreserve_clear(dsl_pool_t *dp, int64_t space, dmu_tx_t *tx) +{ + ASSERT(dp->dp_tempreserved[tx->tx_txg & TXG_MASK] >= space); + atomic_add_64(&dp->dp_tempreserved[tx->tx_txg & TXG_MASK], -space); +} + +void +dsl_pool_memory_pressure(dsl_pool_t *dp) +{ + 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]; + } + 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) +{ + if (space > 0) { + mutex_enter(&dp->dp_lock); + dp->dp_space_towrite[tx->tx_txg & TXG_MASK] += space; + mutex_exit(&dp->dp_lock); + } +} + +/* ARGSUSED */ +static int +upgrade_clones_cb(spa_t *spa, uint64_t dsobj, const char *dsname, 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); + 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); + if (err) { + dsl_dataset_rele(ds, FTAG); + return (err); + } + + if (prev->ds_phys->ds_next_snap_obj != ds->ds_object) + break; + dsl_dataset_rele(ds, FTAG); + ds = prev; + prev = NULL; + } + + if (prev == NULL) { + prev = dp->dp_origin_snap; + + /* + * The $ORIGIN can't have any data, or the accounting + * will be wrong. + */ + ASSERT(prev->ds_phys->ds_bp.blk_birth == 0); + + /* The origin doesn't get attached to itself */ + if (ds->ds_object == prev->ds_object) { + dsl_dataset_rele(ds, FTAG); + return (0); + } + + 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; + + dmu_buf_will_dirty(ds->ds_dir->dd_dbuf, tx); + ds->ds_dir->dd_phys->dd_origin_obj = prev->ds_object; + + dmu_buf_will_dirty(prev->ds_dbuf, tx); + prev->ds_phys->ds_num_children++; + + if (ds->ds_phys->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)); + } + } + + ASSERT(ds->ds_dir->dd_phys->dd_origin_obj == prev->ds_object); + ASSERT(ds->ds_phys->ds_prev_snap_obj == prev->ds_object); + + if (prev->ds_phys->ds_next_clones_obj == 0) { + prev->ds_phys->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)); + + dsl_dataset_rele(ds, FTAG); + if (prev != dp->dp_origin_snap) + dsl_dataset_rele(prev, FTAG); + return (0); +} + +void +dsl_pool_upgrade_clones(dsl_pool_t *dp, dmu_tx_t *tx) +{ + 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); +} + +void +dsl_pool_create_origin(dsl_pool_t *dp, dmu_tx_t *tx) +{ + uint64_t dsobj; + dsl_dataset_t *ds; + + ASSERT(dmu_tx_is_syncing(tx)); + ASSERT(dp->dp_origin_snap == NULL); + + /* 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, + dp, &dp->dp_origin_snap)); + dsl_dataset_rele(ds, FTAG); + rw_exit(&dp->dp_config_rwlock); +} |