client: force sending cap revoke ack always

If just before the revoke request, which will increase the 'seq', is
sent out the clients released the corresponding caps and sent out
the cap update request with old 'seq', the mds will miss checking
the seqs and calculating the caps.

We should always send an ack for revoke requests.

Fixes: https://tracker.ceph.com/issues/61782
Signed-off-by: Xiubo Li <xiubli@redhat.com>
(cherry picked from commit 09a2e33c4aca6e72d75e2527ab5f467576d55dc8)

diff --git a/src/client/Client.cc b/src/client/Client.cc
index a51516aa13ef0f5fa0386129de0a79b517e75ec8..fd4cb00add172d38448316ef62620ffe1c504274 100644 (file)
--- a/src/client/Client.cc
+++ b/src/client/Client.cc
@@ -5715,6 +5715,13 @@ void Client::handle_cap_grant(MetaSession *session, Inode *in, Cap *cap, const M
     }
   }
 
+  // just in case the caps was released just before we get the revoke msg
+  if (!check && m->get_op() == CEPH_CAP_OP_REVOKE) {
+    cap->wanted = 0; // don't let check_caps skip sending a response to MDS
+    check = true;
+    flags = CHECK_CAPS_NODELAY;
+  }
+
   if (check)
     check_caps(in, flags);