tools/cephfs: scan the links to set the proper dnfirst

The ceph code will set the dnfirst=2 as default instead of CEPH_NOSNAP.
And this will avoid the MDS daemon assert crash:

ceph_assert(in->first <= straydn->first)

Fixes: https://tracker.ceph.com/issues/44380
Signed-off-by: Xiubo Li <xiubli@redhat.com>

diff --git a/qa/tasks/cephfs/test_data_scan.py b/qa/tasks/cephfs/test_data_scan.py
index dcc48a2a2ff6047844b78ca6a5c4c839db8a6140..d4733bf32bf4bf5c7f08815ec04fdfbdf37eed7e 100644 (file)
--- a/qa/tasks/cephfs/test_data_scan.py
+++ b/qa/tasks/cephfs/test_data_scan.py
@@ -485,6 +485,7 @@ class TestDataScan(CephFSTestCase):
         # by checking the omap now has the dentry's key again
         self.fs.data_scan(["scan_extents", self.fs.get_data_pool_name()])
         self.fs.data_scan(["scan_inodes", self.fs.get_data_pool_name()])
+        self.fs.data_scan(["scan_links"])
         self.assertIn(victim_key, self._dirfrag_keys(frag_obj_id))
 
         # Start the filesystem and check that the dentry we deleted is now once again visible