bptree.c revision 9fa718d2f477620f14e3f2948dd03e3470add804
d14abf155341d55053c76eeec58b787a456b753bRobert Mustacchi * CDDL HEADER START
d14abf155341d55053c76eeec58b787a456b753bRobert Mustacchi * The contents of this file are subject to the terms of the
d14abf155341d55053c76eeec58b787a456b753bRobert Mustacchi * Common Development and Distribution License (the "License").
d14abf155341d55053c76eeec58b787a456b753bRobert Mustacchi * You may not use this file except in compliance with the License.
d14abf155341d55053c76eeec58b787a456b753bRobert Mustacchi * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
d14abf155341d55053c76eeec58b787a456b753bRobert Mustacchi * or http://www.opensolaris.org/os/licensing.
d14abf155341d55053c76eeec58b787a456b753bRobert Mustacchi * See the License for the specific language governing permissions
d14abf155341d55053c76eeec58b787a456b753bRobert Mustacchi * and limitations under the License.
d14abf155341d55053c76eeec58b787a456b753bRobert Mustacchi * When distributing Covered Code, include this CDDL HEADER in each
d14abf155341d55053c76eeec58b787a456b753bRobert Mustacchi * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
d14abf155341d55053c76eeec58b787a456b753bRobert Mustacchi * If applicable, add the following below this CDDL HEADER, with the
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d14abf155341d55053c76eeec58b787a456b753bRobert Mustacchi * CDDL HEADER END
d14abf155341d55053c76eeec58b787a456b753bRobert Mustacchi * Copyright (c) 2012 by Delphix. All rights reserved.
d14abf155341d55053c76eeec58b787a456b753bRobert Mustacchi * A bptree is a queue of root block pointers from destroyed datasets. When a
d14abf155341d55053c76eeec58b787a456b753bRobert Mustacchi * dataset is destroyed its root block pointer is put on the end of the pool's
d14abf155341d55053c76eeec58b787a456b753bRobert Mustacchi * bptree queue so the dataset's blocks can be freed asynchronously by
d14abf155341d55053c76eeec58b787a456b753bRobert Mustacchi * dsl_scan_sync. This allows the delete operation to finish without traversing
d14abf155341d55053c76eeec58b787a456b753bRobert Mustacchi * all the dataset's blocks.
d14abf155341d55053c76eeec58b787a456b753bRobert Mustacchi * Note that while bt_begin and bt_end are only ever incremented in this code
d14abf155341d55053c76eeec58b787a456b753bRobert Mustacchi * they are effectively reset to 0 every time the entire bptree is freed because
d14abf155341d55053c76eeec58b787a456b753bRobert Mustacchi * the bptree's object is destroyed and re-created.
d14abf155341d55053c76eeec58b787a456b753bRobert Mustacchi bptree_phys_t *ba_phys; /* data in bonus buffer, dirtied if freeing */
d14abf155341d55053c76eeec58b787a456b753bRobert Mustacchi boolean_t ba_free; /* true if freeing during traversal */
d14abf155341d55053c76eeec58b787a456b753bRobert Mustacchi bptree_itor_t *ba_func; /* function to call for each blockpointer */
d14abf155341d55053c76eeec58b787a456b753bRobert Mustacchi void *ba_arg; /* caller supplied argument to ba_func */
d14abf155341d55053c76eeec58b787a456b753bRobert Mustacchi dmu_tx_t *ba_tx; /* caller supplied tx, NULL if not freeing */
d14abf155341d55053c76eeec58b787a456b753bRobert Mustacchi obj = dmu_object_alloc(os, DMU_OTN_UINT64_METADATA,
d14abf155341d55053c76eeec58b787a456b753bRobert Mustacchi * Bonus buffer contents are already initialized to 0, but for
d14abf155341d55053c76eeec58b787a456b753bRobert Mustacchi * readability we make it explicit.
d14abf155341d55053c76eeec58b787a456b753bRobert Mustacchi VERIFY0(dmu_bonus_hold(os, obj, FTAG, &db));
d14abf155341d55053c76eeec58b787a456b753bRobert Mustacchibptree_free(objset_t *os, uint64_t obj, dmu_tx_t *tx)
d14abf155341d55053c76eeec58b787a456b753bRobert Mustacchi VERIFY0(dmu_bonus_hold(os, obj, FTAG, &db));
d14abf155341d55053c76eeec58b787a456b753bRobert Mustacchibptree_add(objset_t *os, uint64_t obj, blkptr_t *bp, uint64_t birth_txg,
d14abf155341d55053c76eeec58b787a456b753bRobert Mustacchi uint64_t bytes, uint64_t comp, uint64_t uncomp, dmu_tx_t *tx)
d14abf155341d55053c76eeec58b787a456b753bRobert Mustacchi * bptree objects are in the pool mos, therefore they can only be
d14abf155341d55053c76eeec58b787a456b753bRobert Mustacchi * modified in syncing context. Furthermore, this is only modified
d14abf155341d55053c76eeec58b787a456b753bRobert Mustacchi * by the sync thread, so no locking is necessary.
d14abf155341d55053c76eeec58b787a456b753bRobert Mustacchi VERIFY0(dmu_bonus_hold(os, obj, FTAG, &db));
d14abf155341d55053c76eeec58b787a456b753bRobert Mustacchi dmu_write(os, obj, bt->bt_end * sizeof (bte), sizeof (bte), &bte, tx);
d14abf155341d55053c76eeec58b787a456b753bRobert Mustacchi/* ARGSUSED */
d14abf155341d55053c76eeec58b787a456b753bRobert Mustacchibptree_visit_cb(spa_t *spa, zilog_t *zilog, const blkptr_t *bp, arc_buf_t *pbuf,
d14abf155341d55053c76eeec58b787a456b753bRobert Mustacchi const zbookmark_t *zb, const dnode_phys_t *dnp, void *arg)
d14abf155341d55053c76eeec58b787a456b753bRobert Mustacchi err = ba->ba_func(ba->ba_arg, bp, ba->ba_tx);
d14abf155341d55053c76eeec58b787a456b753bRobert Mustacchi ba->ba_phys->bt_bytes -= bp_get_dsize_sync(spa, bp);
d14abf155341d55053c76eeec58b787a456b753bRobert Mustacchi ba->ba_phys->bt_uncomp -= BP_GET_UCSIZE(bp);
d14abf155341d55053c76eeec58b787a456b753bRobert Mustacchibptree_iterate(objset_t *os, uint64_t obj, boolean_t free, bptree_itor_t func,
d14abf155341d55053c76eeec58b787a456b753bRobert Mustacchi for (i = ba.ba_phys->bt_begin; i < ba.ba_phys->bt_end; i++) {
d14abf155341d55053c76eeec58b787a456b753bRobert Mustacchi ASSERT(!free || i == ba.ba_phys->bt_begin);
d14abf155341d55053c76eeec58b787a456b753bRobert Mustacchi err = dmu_read(os, obj, i * sizeof (bte), sizeof (bte),
d14abf155341d55053c76eeec58b787a456b753bRobert Mustacchi err = traverse_dataset_destroyed(os->os_spa, &bte.be_bp,
d14abf155341d55053c76eeec58b787a456b753bRobert Mustacchi bte.be_birth_txg, &bte.be_zb, TRAVERSE_POST,
d14abf155341d55053c76eeec58b787a456b753bRobert Mustacchi /* save bookmark for future resume */
d14abf155341d55053c76eeec58b787a456b753bRobert Mustacchi ASSERT(!free || err != 0 || ba.ba_phys->bt_begin == ba.ba_phys->bt_end);
d14abf155341d55053c76eeec58b787a456b753bRobert Mustacchi /* if all blocks are free there should be no used space */