1 files changed, 4 insertions, 3 deletions

diff --git a/fs/btrfs/tree-defrag.c b/fs/btrfs/tree-defrag.c
index 5085e9e693b..c02e2bf2f02 100644
--- a/fs/btrfs/tree-defrag.c
+++ b/fs/btrfs/tree-defrag.c
@@ -51,6 +51,7 @@ static int defrag_walk_down(struct btrfs_trans_handle *trans,
         struct extent_buffer *next;
         struct extent_buffer *cur;
         u64 bytenr;
+        u64 ptr_gen;
         int ret = 0;
         int is_extent = 0;
 
@@ -93,11 +94,12 @@ static int defrag_walk_down(struct btrfs_trans_handle *trans,
                         break;
                 }
                 bytenr = btrfs_node_blockptr(cur, path->slots[*level]);
+                ptr_gen = btrfs_node_ptr_generation(cur, path->slots[*level]);
 
                 if (cache_only) {
                         next = btrfs_find_tree_block(root, bytenr,
                                            btrfs_level_size(root, *level - 1));
-                        if (!next || !btrfs_buffer_uptodate(next) ||
+                        if (!next || !btrfs_buffer_uptodate(next, ptr_gen) ||
                             !btrfs_buffer_defrag(next)) {
                                 free_extent_buffer(next);
                                 path->slots[*level]++;
@@ -106,8 +108,7 @@ static int defrag_walk_down(struct btrfs_trans_handle *trans,
                 } else {
                         next = read_tree_block(root, bytenr,
                                        btrfs_level_size(root, *level - 1),
-                                       btrfs_node_ptr_generation(cur,
-                                                         path->slots[*level]));
+                                       ptr_gen);
                 }
                 ret = btrfs_cow_block(trans, root, next, path->nodes[*level],
                                       path->slots[*level], &next);