Btrfs: Add a write ahead tree log to optimize synchronous operations

File syncs and directory syncs are optimized by copying their
items into a special (copy-on-write) log tree.  There is one log tree per
subvolume and the btrfs super block points to a tree of log tree roots.

After a crash, items are copied out of the log tree and back into the
subvolume.  See tree-log.c for all the details.

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

1 files changed, 2 insertions, 2 deletions

diff --git a/fs/btrfs/tree-defrag.c b/fs/btrfs/tree-defrag.c
index cc2650b06952..b3bb5bbad76e 100644
--- a/fs/btrfs/tree-defrag.c
+++ b/fs/btrfs/tree-defrag.c
@@ -81,12 +81,12 @@ int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
                 memcpy(&key, &root->defrag_progress, sizeof(key));
         }
 
-        path->lowest_level = 1;
         path->keep_locks = 1;
         if (cache_only)
                 min_trans = root->defrag_trans_start;
 
-        ret = btrfs_search_forward(root, &key, path, cache_only, min_trans);
+        ret = btrfs_search_forward(root, &key, NULL, path,
+                                   cache_only, min_trans);
         if (ret < 0)
                 goto out;
         if (ret > 0) {