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Serialize ZTHR operations to eliminate races

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Adds a new lock for serializing operations on zthrs.
The commit also includes some code cleanup and
refactoring.

Reviewed by: Matt Ahrens <mahrens@delphix.com>
Reviewed by: Tom Caputi <tcaputi@datto.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Serapheim Dimitropoulos <serapheim@delphix.com>
Closes #8229
This commit is contained in:
Serapheim Dimitropoulos
2019-01-13 10:09:46 -08:00
committed by Brian Behlendorf
parent 83c796c5e9
commit 61c3391acc
7 changed files with 192 additions and 130 deletions
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module/zfs/spa.c
+6 -8
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@@ -1486,13 +1486,11 @@ spa_unload(spa_t *spa)
}
if (spa->spa_condense_zthr != NULL) {
ASSERT(!zthr_isrunning(spa->spa_condense_zthr));
zthr_destroy(spa->spa_condense_zthr);
spa->spa_condense_zthr = NULL;
}
if (spa->spa_checkpoint_discard_zthr != NULL) {
ASSERT(!zthr_isrunning(spa->spa_checkpoint_discard_zthr));
zthr_destroy(spa->spa_checkpoint_discard_zthr);
spa->spa_checkpoint_discard_zthr = NULL;
}
@@ -7214,12 +7212,12 @@ spa_async_suspend(spa_t *spa)
spa_vdev_remove_suspend(spa);
zthr_t *condense_thread = spa->spa_condense_zthr;
if (condense_thread != NULL && zthr_isrunning(condense_thread))
VERIFY0(zthr_cancel(condense_thread));
if (condense_thread != NULL)
zthr_cancel(condense_thread);
zthr_t *discard_thread = spa->spa_checkpoint_discard_zthr;
if (discard_thread != NULL && zthr_isrunning(discard_thread))
VERIFY0(zthr_cancel(discard_thread));
if (discard_thread != NULL)
zthr_cancel(discard_thread);
}
void
@@ -7232,11 +7230,11 @@ spa_async_resume(spa_t *spa)
spa_restart_removal(spa);
zthr_t *condense_thread = spa->spa_condense_zthr;
if (condense_thread != NULL && !zthr_isrunning(condense_thread))
if (condense_thread != NULL)
zthr_resume(condense_thread);
zthr_t *discard_thread = spa->spa_checkpoint_discard_zthr;
if (discard_thread != NULL && !zthr_isrunning(discard_thread))
if (discard_thread != NULL)
zthr_resume(discard_thread);
}