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Prevent unnecessary resilver restarts

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If a device is participating in an active resilver, then it will have a
non-empty DTL. Operations like vdev_{open,reopen,probe}() can cause the
resilver to be restarted (or deferred to be restarted later), which is
unnecessary if the DTL is still covered by the current scan range. This
is similar to the logic in vdev_dtl_should_excise() where the DTL can
only be excised if it's max txg is in the resilvered range.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: John Gallagher <john.gallagher@delphix.com>
Reviewed-by: Kjeld Schouten <kjeld@schouten-lebbing.nl>
Signed-off-by: John Poduska <jpoduska@datto.com>
Issue #840 
Closes #9155
Closes #9378
Closes #9551
Closes #9588
This commit is contained in:
jwpoduska
2019-11-27 13:15:01 -05:00
committed by Brian Behlendorf
parent 894f6696b4
commit 3c819a2c7d
14 changed files with 410 additions and 88 deletions
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include/sys/dsl_scan.h
+4 -2
View File
@@ -21,7 +21,7 @@
/*
* Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2012, 2017 by Delphix. All rights reserved.
* Copyright (c) 2017 Datto Inc.
* Copyright (c) 2017, 2019, Datto Inc. All rights reserved.
*/
#ifndef _SYS_DSL_SCAN_H
@@ -164,10 +164,12 @@ void dsl_scan_fini(struct dsl_pool *dp);
void dsl_scan_sync(struct dsl_pool *, dmu_tx_t *);
int dsl_scan_cancel(struct dsl_pool *);
int dsl_scan(struct dsl_pool *, pool_scan_func_t);
void dsl_scan_assess_vdev(struct dsl_pool *dp, vdev_t *vd);
boolean_t dsl_scan_scrubbing(const struct dsl_pool *dp);
int dsl_scrub_set_pause_resume(const struct dsl_pool *dp, pool_scrub_cmd_t cmd);
void dsl_resilver_restart(struct dsl_pool *, uint64_t txg);
void dsl_scan_restart_resilver(struct dsl_pool *, uint64_t txg);
boolean_t dsl_scan_resilvering(struct dsl_pool *dp);
boolean_t dsl_scan_resilver_scheduled(struct dsl_pool *dp);
boolean_t dsl_dataset_unstable(struct dsl_dataset *ds);
void dsl_scan_ddt_entry(dsl_scan_t *scn, enum zio_checksum checksum,
ddt_entry_t *dde, dmu_tx_t *tx);