From 3243af47d60558227263203cdc4f9b9f0ebb3f5e Mon Sep 17 00:00:00 2001
From: Patrick Donnelly <pdonnell@ibm.com>
Date: Tue, 28 Jan 2025 13:06:36 -0500
Subject: [PATCH] mds: do not path traverse a damaged dirfrag

Fixes: https://tracker.ceph.com/issues/69695
Signed-off-by: Patrick Donnelly <pdonnell@ibm.com>
---
 src/mds/MDCache.cc | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/mds/MDCache.cc b/src/mds/MDCache.cc
index 04e1fd7111952..e23412734173e 100644
--- a/src/mds/MDCache.cc
+++ b/src/mds/MDCache.cc
@@ -8452,6 +8452,13 @@ int MDCache::path_traverse(const MDRequestRef& mdr, MDSContextFactory& cf,
       }
     }
     ceph_assert(curdir);
+
+    if (mds->damage_table.is_dirfrag_damaged(curdir)) {
+      dout(4) << "traverse: stopped lookup at dirfrag "
+              << *curdir << "/" << path[depth] << " snap=" << snapid << dendl;
+      return -CEPHFS_EIO;
+    }
+
     if (pdir) {
       *pdir = curdir;
     }
-- 
2.39.5