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37f03da8ba
Deleting a clone requires finding blocks are clone-only, not shared with the snapshot. This was done by traversing the entire block tree which results in a large performance penalty for sparsely written clones. This is new method keeps track of clone blocks when they are modified in a "Livelist" so that, when it’s time to delete, the clone-specific blocks are already at hand. We see performance improvements because now deletion work is proportional to the number of clone-modified blocks, not the size of the original dataset. Reviewed-by: Sean Eric Fagan <sef@ixsystems.com> Reviewed-by: Matt Ahrens <matt@delphix.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Serapheim Dimitropoulos <serapheim@delphix.com> Signed-off-by: Sara Hartse <sara.hartse@delphix.com> Closes #8416
92 lines
2.4 KiB
C
92 lines
2.4 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
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* Copyright (c) 2012, 2018 by Delphix. All rights reserved.
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*/
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#include <sys/bplist.h>
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#include <sys/zfs_context.h>
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void
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bplist_create(bplist_t *bpl)
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{
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mutex_init(&bpl->bpl_lock, NULL, MUTEX_DEFAULT, NULL);
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list_create(&bpl->bpl_list, sizeof (bplist_entry_t),
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offsetof(bplist_entry_t, bpe_node));
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}
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void
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bplist_destroy(bplist_t *bpl)
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{
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list_destroy(&bpl->bpl_list);
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mutex_destroy(&bpl->bpl_lock);
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}
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void
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bplist_append(bplist_t *bpl, const blkptr_t *bp)
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{
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bplist_entry_t *bpe = kmem_alloc(sizeof (*bpe), KM_SLEEP);
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mutex_enter(&bpl->bpl_lock);
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bpe->bpe_blk = *bp;
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list_insert_tail(&bpl->bpl_list, bpe);
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mutex_exit(&bpl->bpl_lock);
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}
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/*
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* To aid debugging, we keep the most recently removed entry. This way if
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* we are in the callback, we can easily locate the entry.
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*/
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static bplist_entry_t *bplist_iterate_last_removed;
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void
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bplist_iterate(bplist_t *bpl, bplist_itor_t *func, void *arg, dmu_tx_t *tx)
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{
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bplist_entry_t *bpe;
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mutex_enter(&bpl->bpl_lock);
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while ((bpe = list_head(&bpl->bpl_list))) {
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bplist_iterate_last_removed = bpe;
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list_remove(&bpl->bpl_list, bpe);
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mutex_exit(&bpl->bpl_lock);
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func(arg, &bpe->bpe_blk, tx);
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kmem_free(bpe, sizeof (*bpe));
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mutex_enter(&bpl->bpl_lock);
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}
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mutex_exit(&bpl->bpl_lock);
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}
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void
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bplist_clear(bplist_t *bpl)
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{
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bplist_entry_t *bpe;
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mutex_enter(&bpl->bpl_lock);
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while ((bpe = list_head(&bpl->bpl_list))) {
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bplist_iterate_last_removed = bpe;
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list_remove(&bpl->bpl_list, bpe);
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kmem_free(bpe, sizeof (*bpe));
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}
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mutex_exit(&bpl->bpl_lock);
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}
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