diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 28e9ef8a3253db0e8443d26cb0c752577b380625..8a74f9027d6504459c827fec113fc51211df671c 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -210,7 +210,7 @@ static int btree_writepages(struct address_space *mapping,
 {
 	struct extent_map_tree *tree;
 	tree = &BTRFS_I(mapping->host)->extent_tree;
-	if (wbc->sync_mode == WB_SYNC_NONE) {
+	if (wbc->sync_mode == WB_SYNC_NONE && current_is_pdflush()) {
 		u64 num_dirty;
 		u64 start = 0;
 		unsigned long thresh = 96 * 1024 * 1024;