Add support for defragging files via btrfsctl -d. Avoid OOM on extent tree

defrag.

Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/fs/btrfs/tree-defrag.c b/fs/btrfs/tree-defrag.c
index 35fd20d2464..420597127ed 100644
--- a/fs/btrfs/tree-defrag.c
+++ b/fs/btrfs/tree-defrag.c
@@ -113,6 +113,8 @@ static int defrag_walk_down(struct btrfs_trans_handle *trans,
         }
         WARN_ON(*level < 0);
         WARN_ON(*level >= BTRFS_MAX_LEVEL);
+        clear_buffer_defrag(path->nodes[*level]);
+        clear_buffer_defrag_done(path->nodes[*level]);
         btrfs_block_release(root, path->nodes[*level]);
         path->nodes[*level] = NULL;
         *level += 1;
@@ -143,6 +145,7 @@ static int defrag_walk_up(struct btrfs_trans_handle *trans,
                         return 0;
                 } else {
                         clear_buffer_defrag(path->nodes[*level]);
+                        clear_buffer_defrag_done(path->nodes[*level]);
                         btrfs_block_release(root, path->nodes[*level]);
                         path->nodes[*level] = NULL;
                         *level = i + 1;