dm writecache: skip writecache_wait when using pmem mode

The array bio_in_progress is only used with ssd mode. So skip
writecache_wait_for_ios in writecache_discard when pmem mode.

Signed-off-by: Huaisheng Ye <yehs1@lenovo.com>
Acked-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>

diff --git a/drivers/md/dm-writecache.c b/drivers/md/dm-writecache.c
index ddff552..6b28990 100644 (file)
--- a/drivers/md/dm-writecache.c
+++ b/drivers/md/dm-writecache.c
@@ -849,8 +849,10 @@ static void writecache_discard(struct dm_writecache *wc, sector_t start, sector_
 
                if (likely(!e->write_in_progress)) {
                        if (!discarded_something) {
-                               writecache_wait_for_ios(wc, READ);
-                               writecache_wait_for_ios(wc, WRITE);
+                               if (!WC_MODE_PMEM(wc)) {
+                                       writecache_wait_for_ios(wc, READ);
+                                       writecache_wait_for_ios(wc, WRITE);
+                               }
                                discarded_something = true;
                        }
                        if (!writecache_entry_is_committed(wc, e))