1 files changed, 13 insertions, 0 deletions

diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c
index 332ec35d2c08..d81cda2e077c 100644
--- a/fs/btrfs/tree-log.c
+++ b/fs/btrfs/tree-log.c
@@ -158,6 +158,19 @@ static int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
          */
         new_root->ref_cows = 0;
         new_root->last_trans = trans->transid;
+
+        /*
+         * we need to make sure the root block for this new tree
+         * is marked as dirty in the dirty_log_pages tree.  This
+         * is how it gets flushed down to disk at tree log commit time.
+         *
+         * the tree logging mutex keeps others from coming in and changing
+         * the new_root->node, so we can safely access it here
+         */
+        set_extent_dirty(&new_root->dirty_log_pages, new_root->node->start,
+                         new_root->node->start + new_root->node->len - 1,
+                         GFP_NOFS);
+
 fail:
         return ret;
 }