/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*- * vim:expandtab:shiftwidth=8:tabstop=8: * * Portal-RPC reconnection and replay operations, for use in recovery. * * This code is issued under the GNU General Public License. * See the file COPYING in this distribution * * Copryright (C) 1996 Peter J. Braam * Copryright (C) 1999 Stelias Computing Inc. * Copryright (C) 1999 Seagate Technology Inc. * Copryright (C) 2001 Mountain View Data, Inc. * Copryright (C) 2002 Cluster File Systems, Inc. * */ #include #include #include #define DEBUG_SUBSYSTEM S_RPC #include #include #include int ptlrpc_reconnect_import(struct obd_import *imp, int rq_opc) { struct obd_device *obd = imp->imp_obd; struct client_obd *cli = &obd->u.cli; int size[] = { sizeof(cli->cl_target_uuid), sizeof(obd->obd_uuid) }; char *tmp[] = {cli->cl_target_uuid, obd->obd_uuid }; struct ptlrpc_connection *conn = imp->imp_connection; struct lustre_handle old_hdl; struct ptlrpc_request *request; struct obd_export *ldlmexp; int rc; request = ptlrpc_prep_req(imp, rq_opc, 2, size, tmp); request->rq_level = LUSTRE_CONN_NEW; request->rq_replen = lustre_msg_size(0, NULL); /* * This address is the export that represents our client-side LDLM * service (for ASTs). We should only have one on this list, so we * just grab the first one. * * XXX tear down export, call class_obd_connect? */ ldlmexp = list_entry(obd->obd_exports.next, struct obd_export, exp_obd_chain); request->rq_reqmsg->addr = (__u64)(unsigned long)ldlmexp; request->rq_reqmsg->cookie = ldlmexp->exp_cookie; rc = ptlrpc_queue_wait(request); rc = ptlrpc_check_status(request, rc); if (rc) { CERROR("cannot connect to %s@%s: rc = %d\n", cli->cl_target_uuid, conn->c_remote_uuid, rc); ptlrpc_free_req(request); GOTO(out_disc, rc = -ENOTCONN); } old_hdl = imp->imp_handle; imp->imp_handle.addr = request->rq_repmsg->addr; imp->imp_handle.cookie = request->rq_repmsg->cookie; CERROR("reconnected to %s@%s (%Lx/%Lx, was %Lx/%Lx)!\n", cli->cl_target_uuid, conn->c_remote_uuid, imp->imp_handle.addr, imp->imp_handle.cookie, old_hdl.addr, old_hdl.cookie); ptlrpc_req_finished(request); out_disc: return rc; } int ptlrpc_run_recovery_upcall(struct ptlrpc_connection *conn) { char *argv[3]; char *envp[3]; int rc; ENTRY; conn->c_level = LUSTRE_CONN_RECOVD; argv[0] = obd_recovery_upcall; argv[1] = conn->c_remote_uuid; argv[2] = NULL; envp[0] = "HOME=/"; envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin"; envp[2] = NULL; rc = call_usermodehelper(argv[0], argv, envp); if (rc < 0) { CERROR("Error invoking recovery upcall %s for %s: %d\n", argv[0], argv[1], rc); CERROR("Check /proc/sys/lustre/recovery_upcall?\n"); } else { CERROR("Invoked upcall %s for connection %s\n", argv[0], argv[1]); } /* * We don't want to make this a "failed" recovery, because the system * administrator -- or, perhaps, tester -- may well be able to rescue * things by running the correct upcall. */ RETURN(0); } #define REPLAY_COMMITTED 0 /* Fully processed (commit + reply). */ #define REPLAY_REPLAY 1 /* Forced-replay (e.g. open). */ #define REPLAY_RESEND 2 /* Resend required. */ #define REPLAY_RESEND_IGNORE 3 /* Resend, ignore the reply (already saw it). */ #define REPLAY_RESTART 4 /* Have to restart the call, sorry! */ #define REPLAY_NO_STATE 5 /* Request doesn't change MDS state: skip. */ static int replay_state(struct ptlrpc_request *req, __u64 last_xid) { /* This request must always be replayed. */ if (req->rq_flags & PTL_RPC_FL_REPLAY) return REPLAY_REPLAY; /* Uncommitted request */ if (req->rq_xid > last_xid) { if (req->rq_flags & PTL_RPC_FL_REPLIED) { if (req->rq_transno == 0) { /* If no transno was returned, no state was altered on the MDS. */ return REPLAY_NO_STATE; } /* Saw reply, so resend and ignore new reply. */ return REPLAY_RESEND_IGNORE; } /* Didn't see reply either, so resend. */ return REPLAY_RESEND; } /* This request has been committed and we saw the reply. Goodbye! */ if (req->rq_flags & PTL_RPC_FL_REPLIED) return REPLAY_COMMITTED; /* Request committed, but we didn't see the reply: have to restart. */ return REPLAY_RESTART; } static char *replay_state2str(int state) { static char *state_strings[] = { "COMMITTED", "REPLAY", "RESEND", "RESEND_IGNORE", "RESTART", "NO_STATE" }; static char *unknown_state = "UNKNOWN"; if (state < 0 || state > (sizeof(state_strings) / sizeof(state_strings[0]))) { return unknown_state; } return state_strings[state]; } int ptlrpc_replay(struct ptlrpc_connection *conn) { int rc = 0; struct list_head *tmp, *pos; struct ptlrpc_request *req; ENTRY; spin_lock(&conn->c_lock); CDEBUG(D_HA, "connection %p to %s has last_xid "LPD64"\n", conn, conn->c_remote_uuid, conn->c_last_xid); list_for_each(tmp, &conn->c_sending_head) { int state; req = list_entry(tmp, struct ptlrpc_request, rq_list); state = replay_state(req, conn->c_last_xid); DEBUG_REQ(D_HA, req, "SENDING: %s: ", replay_state2str(state)); } list_for_each(tmp, &conn->c_delayed_head) { int state; req = list_entry(tmp, struct ptlrpc_request, rq_list); state = replay_state(req, conn->c_last_xid); DEBUG_REQ(D_HA, req, "DELAYED: "); } list_for_each_safe(tmp, pos, &conn->c_sending_head) { req = list_entry(tmp, struct ptlrpc_request, rq_list); switch (replay_state(req, conn->c_last_xid)) { case REPLAY_REPLAY: DEBUG_REQ(D_HA, req, "REPLAY:"); rc = ptlrpc_replay_req(req); #if 0 #error We should not hold a spinlock over such a lengthy operation. #error If necessary, drop spinlock, do operation, re-get spinlock, restart loop. #error If we need to avoid re-processint items, then delete them from the list #error as they are replayed and re-add at the tail of this list, so the next #error item to process will always be at the head of the list. #endif if (rc) { CERROR("recovery replay error %d for req %Ld\n", rc, req->rq_xid); GOTO(out, rc); } break; case REPLAY_COMMITTED: DEBUG_REQ(D_HA, req, "COMMITTED:"); /* XXX commit now? */ break; case REPLAY_NO_STATE: DEBUG_REQ(D_HA, req, "NO_STATE:"); /* XXX commit now? */ break; case REPLAY_RESEND_IGNORE: DEBUG_REQ(D_HA, req, "RESEND_IGNORE:"); rc = ptlrpc_replay_req(req); if (rc) { CERROR("request resend error %d for req %Ld\n", rc, req->rq_xid); GOTO(out, rc); } break; case REPLAY_RESTART: DEBUG_REQ(D_HA, req, "RESTART:"); ptlrpc_restart_req(req); break; case REPLAY_RESEND: DEBUG_REQ(D_HA, req, "RESEND:"); ptlrpc_resend_req(req); break; default: LBUG(); } } conn->c_level = LUSTRE_CONN_FULL; recovd_conn_fixed(conn); CERROR("recovery complete on conn %p(%s), waking delayed reqs\n", conn, conn->c_remote_uuid); /* Finally, continue processing requests that blocked for recovery. */ list_for_each_safe(tmp, pos, &conn->c_delayed_head) { req = list_entry(tmp, struct ptlrpc_request, rq_list); DEBUG_REQ(D_HA, req, "WAKING: "); ptlrpc_continue_req(req); } EXIT; out: spin_unlock(&conn->c_lock); return rc; }