dm writecache: skip writecache_wait for pmem mode

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 <[email protected]> Signed-off-by: Huaisheng Ye <[email protected]> Acked-by: Mikulas Patocka <[email protected]> Signed-off-by: Mike Snitzer <[email protected]>
gibsson · Sep 5, 2019 · 6d19591 · 6d19591
1 parent fb16c79
commit 6d19591
Showing 1 changed file with 2 additions and 1 deletion.
diff --git 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));