Btrfs: move checks in set_page_dirty under DEBUG

This is a high traffic function, let's try and do as little as possible
during normal operations shall we?

Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index faf182691b40..b8f7f04a6407 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -1001,6 +1001,7 @@ static void btree_invalidatepage(struct page *page, unsigned long offset)
 
 static int btree_set_page_dirty(struct page *page)
 {
+#ifdef DEBUG
         struct extent_buffer *eb;
 
         BUG_ON(!PagePrivate(page));
@@ -1009,6 +1010,7 @@ static int btree_set_page_dirty(struct page *page)
         BUG_ON(!test_bit(EXTENT_BUFFER_DIRTY, &eb->bflags));
         BUG_ON(!atomic_read(&eb->refs));
         btrfs_assert_tree_locked(eb);
+#endif
         return __set_page_dirty_nobuffers(page);
 }