[LU-12333] Add additional rpc flags to DEBUG_REQ_FLAGS

• Type: Improvement
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.13.0
• Affects Version/s: Lustre 2.13.0
• Assignee: Chris Horn
• Reporter: Chris Horn

Description

The PtlRPC state machine relies on flags in the ptlrpc_request structure to transition from one request state to another. When a request is in the RQ_PHASE_UNREG_RPC state there are three flags relevant to the request's ability to transition.

From ptlrpc_check_set():

                        if (req->rq_phase == RQ_PHASE_UNREG_RPC &&
                            ptlrpc_client_recv_or_unlink(req))
                                continue;

and from ptlrpc_client_recv_or_unlink():

        rc = !req->rq_req_unlinked || !req->rq_reply_unlinked ||
             req->rq_receiving_reply;

None of those three flags are printed by the DEBUG_REQ_FLAGS macro. Historically this has made it a little more difficult to troubleshoot bugs resulting in RPCs that are stuck in the unregistering state. Those flags should be added to the macro.