Btrfs: fix page cache memory leak

Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/disk-io.h b/fs/btrfs/disk-io.h
index 1ee7d2a..822ccb8 100644
--- a/fs/btrfs/disk-io.h
+++ b/fs/btrfs/disk-io.h
@@ -55,4 +55,6 @@
 			   u64 num_blocks);
 int btrfs_map_bh_to_logical(struct btrfs_root *root, struct buffer_head *bh,
 			     u64 logical);
+int btrfs_releasepage(struct page *page, gfp_t flags);
+void btrfs_btree_balance_dirty(struct btrfs_root *root);
 #endif