mds/scrub: write root inode backtrace at creation

Write root inode backtrace as soon as it is created;
Unwritten backtrace always caused scrub to fail for root inode.

Fixes: https://tracker.ceph.com/issues/50976
Signed-off-by: Milind Changire <mchangir@redhat.com>
(cherry picked from commit 7757f3ea3c1aebb71fd34454751634a822c021bd)

diff --git a/src/mds/MDCache.cc b/src/mds/MDCache.cc
index 189c99b0bf372c283ca38112fc7285b08e3b207b..37a36179fd62300c33ff7aa1bb09721dd4f21988 100644 (file)
--- a/src/mds/MDCache.cc
+++ b/src/mds/MDCache.cc
@@ -441,6 +441,8 @@ void MDCache::create_empty_hierarchy(MDSGather *gather)
   rootdir->commit(0, gather->new_sub());
 
   root->store(gather->new_sub());
+  root->mark_dirty_parent(mds->mdlog->get_current_segment(), true);
+  root->store_backtrace(gather->new_sub());
 }
 
 void MDCache::create_mydir_hierarchy(MDSGather *gather)