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dm mpath: only flush workqueue when needed

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The workqueues are shared by many multipath devices, only flush whole
workqueue when necessary.  Otherwise, we just flush works as needed.

Signed-off-by: wuzhouhui <wuzhouhui14@mails.ucas.ac.cn>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
wuzhouhui 2018-03-22 22:22:38 +08:00 committed by Mike Snitzer
parent 2adc5c559a
commit 935fcc56ab
1 changed files with 4 additions and 2 deletions
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6
drivers/md/dm-mpath.c
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@ -1211,14 +1211,16 @@ static void flush_multipath_work(struct multipath *m)
set_bit(MPATHF_PG_INIT_DISABLED, &m->flags);
smp_mb__after_atomic();
flush_workqueue(kmpath_handlerd);
if (atomic_read(&m->pg_init_in_progress))
flush_workqueue(kmpath_handlerd);
multipath_wait_for_pg_init_completion(m);
clear_bit(MPATHF_PG_INIT_DISABLED, &m->flags);
smp_mb__after_atomic();
}
flush_workqueue(kmultipathd);
if (m->queue_mode == DM_TYPE_BIO_BASED)
flush_work(&m->process_queued_bios);
flush_work(&m->trigger_event);
}