From: Mikulas Patocka <mpatocka@redhat.com>
To: Mike Snitzer <msnitzer@redhat.com>
Cc: dm-devel@redhat.com
Subject: [dm-devel] [PATCH] dm-writecace: if we are suspended, interrupt flushing
Date: Wed, 26 May 2021 15:49:03 -0400 (EDT) [thread overview]
Message-ID: <alpine.LRH.2.02.2105261541580.28524@file01.intranet.prod.int.rdu2.redhat.com> (raw)
Hi
This is another writecache patch, intended for the next merge window.
Mikulas
From: Mikulas Patocka <mpatocka@redhat.com>
If we are suspended, we want to interrupt the flushing sequence, so that
there is no excessive suspend delay.
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Cc: stable@vger.kernel.org
Index: linux-2.6/drivers/md/dm-writecache.c
===================================================================
--- linux-2.6.orig/drivers/md/dm-writecache.c
+++ linux-2.6/drivers/md/dm-writecache.c
@@ -1844,8 +1844,9 @@ restart:
n_walked++;
if (unlikely(n_walked > WRITEBACK_LATENCY) &&
- likely(!wc->writeback_all) && likely(!dm_suspended(wc->ti))) {
- queue_work(wc->writeback_wq, &wc->writeback_work);
+ likely(!wc->writeback_all)) {
+ if (likely(!dm_suspended(wc->ti)))
+ queue_work(wc->writeback_wq, &wc->writeback_work);
break;
}
--
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