diff options
Diffstat (limited to 'uts/common/fs/zfs/dsl_pool.c')
-rw-r--r-- | uts/common/fs/zfs/dsl_pool.c | 848 |
1 files changed, 848 insertions, 0 deletions
diff --git a/uts/common/fs/zfs/dsl_pool.c b/uts/common/fs/zfs/dsl_pool.c new file mode 100644 index 000000000000..700cc962865d --- /dev/null +++ b/uts/common/fs/zfs/dsl_pool.c @@ -0,0 +1,848 @@ +/* + * 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. + */ + +#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/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> +#include <sys/dsl_deadlist.h> + +int zfs_no_write_throttle = 0; +int zfs_write_limit_shift = 3; /* 1/8th of physical memory */ +int zfs_txg_synctime_ms = 1000; /* target millisecs 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; + +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); + + dp->dp_vnrele_taskq = taskq_create("zfs_vn_rele_taskq", 1, minclsyspri, + 1, 4, 0); + + 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; + uint64_t obj; + + rw_enter(&dp->dp_config_rwlock, RW_WRITER); + err = dmu_objset_open_impl(spa, NULL, &dp->dp_meta_rootbp, + &dp->dp_meta_objset); + if (err) + goto out; + + 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 == 0) { + err = dsl_dataset_hold_obj(dp, + ds->ds_phys->ds_prev_snap_obj, dp, + &dp->dp_origin_snap); + dsl_dataset_rele(ds, FTAG); + } + dsl_dir_close(dd, dp); + if (err) + goto out; + } + + if (spa_version(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_FREE_BPOBJ, sizeof (uint64_t), 1, &obj); + if (err) + goto out; + VERIFY3U(0, ==, bpobj_open(&dp->dp_free_bpobj, + dp->dp_meta_objset, obj)); + } + + 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) + goto out; + + err = dsl_scan_init(dp, txg); + +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_free_dir) + dsl_dir_close(dp->dp_free_dir, dp); + if (dp->dp_root_dir) + dsl_dir_close(dp->dp_root_dir, dp); + + bpobj_close(&dp->dp_free_bpobj); + + /* undo the dmu_objset_open_impl(mos) from dsl_pool_open() */ + if (dp->dp_meta_objset) + dmu_objset_evict(dp->dp_meta_objset); + + txg_list_destroy(&dp->dp_dirty_datasets); + txg_list_destroy(&dp->dp_sync_tasks); + txg_list_destroy(&dp->dp_dirty_dirs); + list_destroy(&dp->dp_synced_datasets); + + arc_flush(dp->dp_spa); + txg_fini(dp); + dsl_scan_fini(dp); + rw_destroy(&dp->dp_config_rwlock); + mutex_destroy(&dp->dp_lock); + taskq_destroy(dp->dp_vnrele_taskq); + 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_t *os; + dsl_dataset_t *ds; + uint64_t obj; + + /* 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); + + /* 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); + + /* Initialize scan structures */ + VERIFY3U(0, ==, 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, + 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_DEADLISTS) { + /* create and open the free dir */ + (void) dsl_dir_create_sync(dp, dp->dp_root_dir, + FREE_DIR_NAME, tx); + VERIFY(0 == 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_MAXBLOCKSIZE, tx); + VERIFY(zap_add(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, + DMU_POOL_FREE_BPOBJ, sizeof (uint64_t), 1, &obj, tx) == 0); + VERIFY3U(0, ==, 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); + + /* create the root dataset */ + obj = dsl_dataset_create_sync_dd(dp->dp_root_dir, NULL, 0, tx); + + /* create the root objset */ + VERIFY(0 == dsl_dataset_hold_obj(dp, obj, FTAG, &ds)); + os = dmu_objset_create_impl(dp->dp_spa, ds, + dsl_dataset_get_blkptr(ds), DMU_OST_ZFS, tx); +#ifdef _KERNEL + zfs_create_fs(os, kcred, zplprops, tx); +#endif + dsl_dataset_rele(ds, FTAG); + + dmu_tx_commit(tx); + + return (dp); +} + +static int +deadlist_enqueue_cb(void *arg, const blkptr_t *bp, dmu_tx_t *tx) +{ + dsl_deadlist_t *dl = arg; + dsl_deadlist_insert(dl, bp, tx); + return (0); +} + +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_t *mos = dp->dp_meta_objset; + hrtime_t start, write_time; + uint64_t data_written; + int err; + + /* + * We need to copy dp_space_towrite() before doing + * dsl_sync_task_group_sync(), because + * dsl_dataset_snapshot_reserve_space() will increase + * dp_space_towrite but not actually write anything. + */ + data_written = dp->dp_space_towrite[txg & TXG_MASK]; + + tx = dmu_tx_create_assigned(dp, txg); + + dp->dp_read_overhead = 0; + start = gethrtime(); + + zio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED); + while (ds = txg_list_remove(&dp->dp_dirty_datasets, txg)) { + /* + * 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); + dsl_dataset_sync(ds, zio, tx); + } + DTRACE_PROBE(pool_sync__1setup); + err = zio_wait(zio); + + write_time = gethrtime() - start; + ASSERT(err == 0); + DTRACE_PROBE(pool_sync__2rootzio); + + for (ds = list_head(&dp->dp_synced_datasets); ds; + ds = list_next(&dp->dp_synced_datasets, ds)) + dmu_objset_do_userquota_updates(ds->ds_objset, tx); + + /* + * Sync the datasets again to push out the changes due to + * userspace 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. + */ + zio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED); + while (ds = txg_list_remove(&dp->dp_dirty_datasets, txg)) { + 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); + + /* + * Move dead blocks from the pending deadlist to the on-disk + * deadlist. + */ + for (ds = list_head(&dp->dp_synced_datasets); ds; + ds = list_next(&dp->dp_synced_datasets, ds)) { + bplist_iterate(&ds->ds_pending_deadlist, + deadlist_enqueue_cb, &ds->ds_deadlist, tx); + } + + while (dstg = txg_list_remove(&dp->dp_sync_tasks, txg)) { + /* + * No more sync tasks should have been added while we + * were syncing. + */ + ASSERT(spa_sync_pass(dp->dp_spa) == 1); + 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; + + start = gethrtime(); + if (list_head(&mos->os_dirty_dnodes[txg & TXG_MASK]) != NULL || + list_head(&mos->os_free_dnodes[txg & TXG_MASK]) != NULL) { + zio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED); + dmu_objset_sync(mos, 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); + + 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 + * + * Note: write_time is in nanosecs, so write_time/MICROSEC + * yields millisecs + */ + ASSERT(zfs_write_limit_min > 0); + if (data_written > zfs_write_limit_min / 8 && write_time > MICROSEC) { + uint64_t throughput = data_written / (write_time / MICROSEC); + + 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_ms)); + } +} + +void +dsl_pool_sync_done(dsl_pool_t *dp, uint64_t txg) +{ + dsl_dataset_t *ds; + objset_t *os; + + while (ds = list_head(&dp->dp_synced_datasets)) { + list_remove(&dp->dp_synced_datasets, ds); + os = ds->ds_objset; + zil_clean(os->os_zil, txg); + ASSERT(!dmu_objset_is_dirty(os, txg)); + dmu_buf_rele(ds->ds_dbuf, ds); + } + ASSERT(!dmu_objset_is_dirty(dp->dp_meta_objset, txg)); +} + +/* + * 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) { + dmu_buf_will_dirty(prev->ds_dbuf, tx); + 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); + + VERIFY3U(0, ==, dmu_objset_find_spa(dp->dp_spa, NULL, upgrade_clones_cb, + tx, DS_FIND_CHILDREN)); +} + +/* ARGSUSED */ +static int +upgrade_dir_clones_cb(spa_t *spa, uint64_t dsobj, const char *dsname, void *arg) +{ + dmu_tx_t *tx = arg; + dsl_dataset_t *ds; + dsl_pool_t *dp = spa_get_dsl(spa); + objset_t *mos = dp->dp_meta_objset; + + VERIFY3U(0, ==, dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds)); + + if (ds->ds_dir->dd_phys->dd_origin_obj) { + dsl_dataset_t *origin; + + VERIFY3U(0, ==, dsl_dataset_hold_obj(dp, + ds->ds_dir->dd_phys->dd_origin_obj, FTAG, &origin)); + + if (origin->ds_dir->dd_phys->dd_clones == 0) { + dmu_buf_will_dirty(origin->ds_dir->dd_dbuf, tx); + origin->ds_dir->dd_phys->dd_clones = zap_create(mos, + DMU_OT_DSL_CLONES, DMU_OT_NONE, 0, tx); + } + + VERIFY3U(0, ==, zap_add_int(dp->dp_meta_objset, + origin->ds_dir->dd_phys->dd_clones, dsobj, tx)); + + dsl_dataset_rele(origin, FTAG); + } + + dsl_dataset_rele(ds, FTAG); + return (0); +} + +void +dsl_pool_upgrade_dir_clones(dsl_pool_t *dp, dmu_tx_t *tx) +{ + ASSERT(dmu_tx_is_syncing(tx)); + uint64_t obj; + + (void) dsl_dir_create_sync(dp, dp->dp_root_dir, FREE_DIR_NAME, tx); + VERIFY(0 == 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_MAXBLOCKSIZE, DMU_OT_BPOBJ_HDR, sizeof (bpobj_phys_t), tx); + VERIFY3U(0, ==, zap_add(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, + DMU_POOL_FREE_BPOBJ, sizeof (uint64_t), 1, &obj, tx)); + VERIFY3U(0, ==, bpobj_open(&dp->dp_free_bpobj, + dp->dp_meta_objset, obj)); + + VERIFY3U(0, ==, dmu_objset_find_spa(dp->dp_spa, NULL, + upgrade_dir_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, 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); +} + +taskq_t * +dsl_pool_vnrele_taskq(dsl_pool_t *dp) +{ + return (dp->dp_vnrele_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; + + if (zapobj == 0) + return; + ASSERT(spa_version(dp->dp_spa) >= SPA_VERSION_USERREFS); + + for (zap_cursor_init(&zc, mos, zapobj); + zap_cursor_retrieve(&zc, &za) == 0; + zap_cursor_advance(&zc)) { + char *htag; + uint64_t dsobj; + + htag = strchr(za.za_name, '-'); + *htag = '\0'; + ++htag; + dsobj = strtonum(za.za_name, NULL); + (void) dsl_dataset_user_release_tmp(dp, dsobj, htag, B_FALSE); + } + 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(mos, DMU_OT_USERREFS, + DMU_OT_NONE, 0, tx); + + VERIFY(zap_add(mos, DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_TMP_USERREFS, + sizeof (uint64_t), 1, &dp->dp_tmp_userrefs_obj, tx) == 0); +} + +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 (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, NULL, + tx, B_FALSE)); +} |