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During regular block writes ZFS sets both logical and physical birth times equal to the current TXG. During dedup and block cloning logical birth time is still set to the current TXG, but physical may be copied from the original block that was used. This represents the fact that logically user data has changed, but the physically it is the same old block. But block rewrite introduces a new situation, when block is not changed logically, but stored in a different place of the pool. From ARC, scrub and some other perspectives this is a new block, but for example for user applications or incremental replication it is not. Somewhat similar thing happen during remap phase of device removal, but in that case space blocks are still acounted as allocated at their logical birth times. This patch introduces a new "rewrite" flag in the block pointer structure, allowing to differentiate physical rewrite (when the block is actually reallocated at the physical birth time) from the device reval case (when the logical birth time is used). The new functionality is not used at this point, and the only expected change is that error log is now kept in terms of physical physical birth times, rather than logical, since if a block with logged error was somehow rewritten, then the previous error does not matter any more. This change also introduces a new TRAVERSE_LOGICAL flag to the traverse code, allowing zfs send, redact and diff to work in context of logical birth times, ignoring physical-only rewrites. It also changes nothing at this point due to lack of those writes, but they will come in a following patch. Reviewed-by: Rob Norris <robn@despairlabs.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Alexander Motin <alexander.motin@TrueNAS.com> Closes #17565
101 lines
3.3 KiB
C
101 lines
3.3 KiB
C
// SPDX-License-Identifier: CDDL-1.0
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/*
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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 https://opensource.org/licenses/CDDL-1.0.
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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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#ifndef _SYS_DMU_TRAVERSE_H
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#define _SYS_DMU_TRAVERSE_H
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#include <sys/zfs_context.h>
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#include <sys/spa.h>
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#include <sys/zio.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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struct dnode_phys;
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struct dsl_dataset;
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struct zilog;
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struct arc_buf;
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typedef int (blkptr_cb_t)(spa_t *spa, zilog_t *zilog, const blkptr_t *bp,
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const zbookmark_phys_t *zb, const struct dnode_phys *dnp, void *arg);
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#define TRAVERSE_PRE (1<<0)
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#define TRAVERSE_POST (1<<1)
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#define TRAVERSE_PREFETCH_METADATA (1<<2)
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#define TRAVERSE_PREFETCH_DATA (1<<3)
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#define TRAVERSE_PREFETCH (TRAVERSE_PREFETCH_METADATA | TRAVERSE_PREFETCH_DATA)
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#define TRAVERSE_HARD (1<<4)
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/*
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* Encrypted dnode blocks have encrypted bonus buffers while the rest
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* of the dnode is left unencrypted. Callers can specify the
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* TRAVERSE_NO_DECRYPT flag to indicate to the traversal code that
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* they wish to receive the raw encrypted dnodes instead of attempting
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* to read the logical data.
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*/
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#define TRAVERSE_NO_DECRYPT (1<<5)
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/*
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* Always use logical birth time for birth time comparisons. This is useful
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* for operations that care about user data changes rather than physical
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* block rewrites (e.g., incremental replication).
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*/
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#define TRAVERSE_LOGICAL (1<<6)
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/* Special traverse error return value to indicate skipping of children */
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#define TRAVERSE_VISIT_NO_CHILDREN -1
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int traverse_dataset(struct dsl_dataset *ds,
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uint64_t txg_start, int flags, blkptr_cb_t func, void *arg);
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int traverse_dataset_resume(struct dsl_dataset *ds, uint64_t txg_start,
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zbookmark_phys_t *resume, int flags, blkptr_cb_t func, void *arg);
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int traverse_dataset_destroyed(spa_t *spa, blkptr_t *blkptr,
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uint64_t txg_start, zbookmark_phys_t *resume, int flags,
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blkptr_cb_t func, void *arg);
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int traverse_pool(spa_t *spa,
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uint64_t txg_start, int flags, blkptr_cb_t func, void *arg);
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/*
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* Note that this calculation cannot overflow with the current maximum indirect
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* block size (128k). If that maximum is increased to 1M, however, this
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* calculation can overflow, and handling would need to be added to ensure
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* continued correctness.
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*/
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static inline uint64_t
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bp_span_in_blocks(uint8_t indblkshift, uint64_t level)
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{
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unsigned int shift = level * (indblkshift - SPA_BLKPTRSHIFT);
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ASSERT3U(shift, <, 64);
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return (1ULL << shift);
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}
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#ifdef __cplusplus
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}
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#endif
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#endif /* _SYS_DMU_TRAVERSE_H */
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