From: Huaisheng Ye <yehs1@lenovo.com>
Date: Mon, 2 Sep 2019 18:04:50 +0800
Subject: [PATCH] dm writecache: skip writecache_wait for pmem mode
Git-commit: 6d1959138c8bdaf69f1116c86c77e6733db6ab34
Patch-mainline: v5.4-rc1
References: bsc#1175995,jsc#SLE-15608
The array bio_in_progress[2] only have chance to be increased and
decreased with ssd mode. For pmem mode, they are not involved at all.
So skip writecache_wait_for_ios in writecache_flush for pmem.
Suggested-by: Doris Yu <tyu1@lenovo.com>
Signed-off-by: Huaisheng Ye <yehs1@lenovo.com>
Acked-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Acked-by: Hannes Reinecke <hare@suse.com>
---
drivers/md/dm-writecache.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/md/dm-writecache.c b/drivers/md/dm-writecache.c
index c48194703dbc..d06b8aa41e26 100644
--- a/drivers/md/dm-writecache.c
+++ b/drivers/md/dm-writecache.c
@@ -726,7 +726,8 @@ static void writecache_flush(struct dm_writecache *wc)
}
writecache_commit_flushed(wc);
- writecache_wait_for_ios(wc, WRITE);
+ if (!WC_MODE_PMEM(wc))
+ writecache_wait_for_ios(wc, WRITE);
wc->seq_count++;
pmem_assign(sb(wc)->seq_count, cpu_to_le64(wc->seq_count));
--
2.16.4