lustre/ptlrpc/client.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  *  Copyright (C) 2002 Cluster File Systems, Inc.
   5  *
   6  *   This file is part of Lustre, http://www.lustre.org.
   7  *
   8  *   Lustre is free software; you can redistribute it and/or
   9  *   modify it under the terms of version 2 of the GNU General Public
  10  *   License as published by the Free Software Foundation.
  11  *
  12  *   Lustre is distributed in the hope that it will be useful,
  13  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *   GNU General Public License for more details.
  16  *
  17  *   You should have received a copy of the GNU General Public License
  18  *   along with Lustre; if not, write to the Free Software
  19  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  *
  21  */
  22
  23 #define DEBUG_SUBSYSTEM S_RPC
  24
  25 #include <linux/obd_support.h>
  26 #include <linux/obd_class.h>
  27 #include <linux/lustre_lib.h>
  28 #include <linux/lustre_ha.h>
  29
  30 void ptlrpc_init_client(struct recovd_obd *recovd,
  31                         int (*recover)(struct ptlrpc_client *recover),
  32                         int req_portal,
  33                         int rep_portal, struct ptlrpc_client *cl)
  34 {
  35         memset(cl, 0, sizeof(*cl));
  36         cl->cli_recovd = recovd;
  37         cl->cli_recover = recover;
  38         if (recovd)
  39                 recovd_cli_manage(recovd, cl);
  40         cl->cli_obd = NULL;
  41         cl->cli_request_portal = req_portal;
  42         cl->cli_reply_portal = rep_portal;
  43         INIT_LIST_HEAD(&cl->cli_delayed_head);
  44         INIT_LIST_HEAD(&cl->cli_sending_head);
  45         INIT_LIST_HEAD(&cl->cli_dying_head);
  46         spin_lock_init(&cl->cli_lock);
  47         sema_init(&cl->cli_rpc_sem, 32);
  48 }
  49
  50 __u8 *ptlrpc_req_to_uuid(struct ptlrpc_request *req)
  51 {
  52         return req->rq_connection->c_remote_uuid;
  53 }
  54
  55 struct ptlrpc_connection *ptlrpc_uuid_to_connection(char *uuid)
  56 {
  57         struct ptlrpc_connection *c;
  58         struct lustre_peer peer;
  59         int err;
  60
  61         err = kportal_uuid_to_peer(uuid, &peer);
  62         if (err != 0) {
  63                 CERROR("cannot find peer %s!\n", uuid);
  64                 return NULL;
  65         }
  66
  67         c = ptlrpc_get_connection(&peer);
  68         if (c) {
  69                 memcpy(c->c_remote_uuid, uuid, sizeof(c->c_remote_uuid));
  70                 c->c_epoch++;
  71         }
  72
  73         return c;
  74 }
  75
  76 void ptlrpc_readdress_connection(struct ptlrpc_connection *conn, char *uuid)
  77 {
  78         struct lustre_peer peer;
  79         int err;
  80
  81         err = kportal_uuid_to_peer(uuid, &peer);
  82         if (err != 0) {
  83                 CERROR("cannot find peer %s!\n", uuid);
  84                 return;
  85         }
  86
  87         memcpy(&conn->c_peer, &peer, sizeof(peer));
  88         return;
  89 }
  90
  91 struct ptlrpc_bulk_desc *ptlrpc_prep_bulk(struct ptlrpc_connection *conn)
  92 {
  93         struct ptlrpc_bulk_desc *desc;
  94
  95         OBD_ALLOC(desc, sizeof(*desc));
  96         if (desc != NULL) {
  97                 desc->b_connection = ptlrpc_connection_addref(conn);
  98                 atomic_set(&desc->b_refcount, 1);
  99                 init_waitqueue_head(&desc->b_waitq);
 100                 INIT_LIST_HEAD(&desc->b_page_list);
 101                 ptl_set_inv_handle(&desc->b_md_h);
 102                 ptl_set_inv_handle(&desc->b_me_h);
 103         }
 104
 105         return desc;
 106 }
 107
 108 struct ptlrpc_bulk_page *ptlrpc_prep_bulk_page(struct ptlrpc_bulk_desc *desc)
 109 {
 110         struct ptlrpc_bulk_page *bulk;
 111
 112         OBD_ALLOC(bulk, sizeof(*bulk));
 113         if (bulk != NULL) {
 114                 bulk->b_desc = desc;
 115                 list_add_tail(&bulk->b_link, &desc->b_page_list);
 116                 desc->b_page_count++;
 117         }
 118         return bulk;
 119 }
 120
 121 void ptlrpc_free_bulk(struct ptlrpc_bulk_desc *desc)
 122 {
 123         struct list_head *tmp, *next;
 124         ENTRY;
 125         if (desc == NULL) {
 126                 EXIT;
 127                 return;
 128         }
 129
 130         list_for_each_safe(tmp, next, &desc->b_page_list) {
 131                 struct ptlrpc_bulk_page *bulk;
 132                 bulk = list_entry(tmp, struct ptlrpc_bulk_page, b_link);
 133                 ptlrpc_free_bulk_page(bulk);
 134         }
 135
 136         ptlrpc_put_connection(desc->b_connection);
 137
 138         OBD_FREE(desc, sizeof(*desc));
 139         EXIT;
 140 }
 141
 142 void ptlrpc_free_bulk_page(struct ptlrpc_bulk_page *bulk)
 143 {
 144         ENTRY;
 145         if (bulk == NULL) {
 146                 EXIT;
 147                 return;
 148         }
 149
 150         list_del(&bulk->b_link);
 151         bulk->b_desc->b_page_count--;
 152         OBD_FREE(bulk, sizeof(*bulk));
 153         EXIT;
 154 }
 155
 156 struct ptlrpc_request *ptlrpc_prep_req(struct ptlrpc_client *cl,
 157                                        struct ptlrpc_connection *conn,
 158                                        int opcode, int count, int *lengths,
 159                                        char **bufs)
 160 {
 161         struct ptlrpc_request *request;
 162         int rc;
 163         ENTRY;
 164
 165         OBD_ALLOC(request, sizeof(*request));
 166         if (!request) {
 167                 CERROR("request allocation out of memory\n");
 168                 RETURN(NULL);
 169         }
 170
 171         rc = lustre_pack_msg(count, lengths, bufs,
 172                              &request->rq_reqlen, &request->rq_reqmsg);
 173         if (rc) {
 174                 CERROR("cannot pack request %d\n", rc);
 175                 OBD_FREE(request, sizeof(*request));
 176                 RETURN(NULL);
 177         }
 178
 179         request->rq_level = LUSTRE_CONN_FULL;
 180         request->rq_type = PTL_RPC_TYPE_REQUEST;
 181         request->rq_client = cl;
 182         request->rq_connection = ptlrpc_connection_addref(conn);
 183
 184         INIT_LIST_HEAD(&request->rq_list);
 185         INIT_LIST_HEAD(&request->rq_multi);
 186         /* this will be dec()d once in req_finished, once in free_committed */
 187         atomic_set(&request->rq_refcount, 2);
 188
 189         spin_lock(&conn->c_lock);
 190         request->rq_xid = HTON__u32(++conn->c_xid_out);
 191         spin_unlock(&conn->c_lock);
 192
 193         request->rq_reqmsg->magic = PTLRPC_MSG_MAGIC;
 194         request->rq_reqmsg->version = PTLRPC_MSG_VERSION;
 195         request->rq_reqmsg->opc = HTON__u32(opcode);
 196         request->rq_reqmsg->type = HTON__u32(PTL_RPC_MSG_REQUEST);
 197
 198         RETURN(request);
 199 }
 200 struct ptlrpc_request *ptlrpc_prep_req2(struct lustre_handle *conn,
 201                                        int opcode, int count, int *lengths,
 202                                        char **bufs)
 203 {
 204         struct client_obd *clobd;
 205         struct ptlrpc_request *req;
 206         struct obd_export *export;
 207
 208         export = class_conn2export(conn);
 209         if (!export) {
 210                 LBUG();
 211                 CERROR("NOT connected\n");
 212                 return NULL;
 213         }
 214
 215         clobd = &export->exp_obd->u.cli;
 216         req = ptlrpc_prep_req(clobd->cl_client, clobd->cl_conn,
 217                               opcode, count, lengths, bufs);
 218         ptlrpc_hdl2req(req, &clobd->cl_exporth);
 219         return req;
 220 }
 221
 222 void ptlrpc_req_finished(struct ptlrpc_request *request)
 223 {
 224         if (request == NULL)
 225                 return;
 226
 227         if (request->rq_repmsg != NULL) {
 228                 OBD_FREE(request->rq_repmsg, request->rq_replen);
 229                 request->rq_repmsg = NULL;
 230                 request->rq_reply_md.start = NULL;
 231         }
 232
 233         if (atomic_dec_and_test(&request->rq_refcount))
 234                 ptlrpc_free_req(request);
 235 }
 236
 237 void ptlrpc_free_req(struct ptlrpc_request *request)
 238 {
 239         ENTRY;
 240         if (request == NULL) {
 241                 EXIT;
 242                 return;
 243         }
 244
 245         if (request->rq_repmsg != NULL)
 246                 OBD_FREE(request->rq_repmsg, request->rq_replen);
 247         if (request->rq_reqmsg != NULL)
 248                 OBD_FREE(request->rq_reqmsg, request->rq_reqlen);
 249
 250         if (request->rq_client) {
 251                 spin_lock(&request->rq_client->cli_lock);
 252                 list_del_init(&request->rq_list);
 253                 spin_unlock(&request->rq_client->cli_lock);
 254         }
 255
 256         ptlrpc_put_connection(request->rq_connection);
 257         list_del(&request->rq_multi);
 258         OBD_FREE(request, sizeof(*request));
 259         EXIT;
 260 }
 261
 262 static int ptlrpc_check_reply(struct ptlrpc_request *req)
 263 {
 264         int rc = 0;
 265
 266         if (req->rq_repmsg != NULL) {
 267                 req->rq_transno = NTOH__u64(req->rq_repmsg->transno);
 268                 req->rq_flags |= PTL_RPC_FL_REPLIED;
 269                 GOTO(out, rc = 1);
 270         }
 271
 272         if (req->rq_flags & PTL_RPC_FL_RECOVERY) {
 273                 CERROR("-- RESTART --\n");
 274                 GOTO(out, rc = 1);
 275         }
 276
 277  out:
 278         CDEBUG(D_NET, "req = %p, rc = %d\n", req, rc);
 279         return rc;
 280 }
 281
 282 int ptlrpc_check_status(struct ptlrpc_request *req, int err)
 283 {
 284         ENTRY;
 285
 286         if (err != 0) {
 287                 CERROR("err is %d\n", err);
 288                 RETURN(err);
 289         }
 290
 291         if (req == NULL) {
 292                 CERROR("req == NULL\n");
 293                 RETURN(-ENOMEM);
 294         }
 295
 296         if (req->rq_repmsg == NULL) {
 297                 CERROR("req->rq_repmsg == NULL\n");
 298                 RETURN(-ENOMEM);
 299         }
 300
 301         err = req->rq_repmsg->status;
 302         if (req->rq_repmsg->type == NTOH__u32(PTL_RPC_MSG_ERR)) {
 303                 CERROR("req->rq_repmsg->type == PTL_RPC_MSG_ERR\n");
 304                 RETURN(err ? err : -EINVAL);
 305         }
 306
 307         if (err != 0) {
 308                 if (err < 0)
 309                         CERROR("req->rq_repmsg->status is %d\n", err);
 310                 else
 311                         CDEBUG(D_INFO, "req->rq_repmsg->status is %d\n", err);
 312                 /* XXX: translate this error from net to host */
 313                 RETURN(err);
 314         }
 315
 316         RETURN(0);
 317 }
 318
 319 static void ptlrpc_cleanup_request_buf(struct ptlrpc_request *request)
 320 {
 321         OBD_FREE(request->rq_reqmsg, request->rq_reqlen);
 322         request->rq_reqmsg = NULL;
 323         request->rq_reqlen = 0;
 324 }
 325
 326 /* Abort this request and cleanup any resources associated with it. */
 327 static int ptlrpc_abort(struct ptlrpc_request *request)
 328 {
 329         /* First remove the ME for the reply; in theory, this means
 330          * that we can tear down the buffer safely. */
 331         PtlMEUnlink(request->rq_reply_me_h);
 332         OBD_FREE(request->rq_reply_md.start, request->rq_replen);
 333         request->rq_repmsg = NULL;
 334         request->rq_replen = 0;
 335         return 0;
 336 }
 337
 338 /* caller must lock cli */
 339 void ptlrpc_free_committed(struct ptlrpc_client *cli)
 340 {
 341         struct list_head *tmp, *saved;
 342         struct ptlrpc_request *req;
 343
 344         list_for_each_safe(tmp, saved, &cli->cli_sending_head) {
 345                 req = list_entry(tmp, struct ptlrpc_request, rq_list);
 346
 347                 if ( (req->rq_flags & PTL_RPC_FL_REPLAY) ) {
 348                         CDEBUG(D_INFO, "Retaining request %Ld for replay\n",
 349                                req->rq_xid);
 350                         continue;
 351                 }
 352
 353                 /* not yet committed */
 354                 if (req->rq_transno > cli->cli_last_committed)
 355                         break;
 356
 357                 CDEBUG(D_INFO, "Marking request xid %Ld as committed ("
 358                        "transno=%Lu, last_committed=%Lu\n",
 359                        (long long)req->rq_xid, (long long)req->rq_transno,
 360                        (long long)cli->cli_last_committed);
 361                 if (atomic_dec_and_test(&req->rq_refcount)) {
 362                         /* we do this to prevent free_req deadlock */
 363                         list_del_init(&req->rq_list);
 364                         req->rq_client = NULL;
 365                         ptlrpc_free_req(req);
 366                 } else {
 367                         list_del_init(&req->rq_list);
 368                         list_add(&req->rq_list, &cli->cli_dying_head);
 369                 }
 370         }
 371
 372         EXIT;
 373         return;
 374 }
 375
 376 void ptlrpc_cleanup_client(struct ptlrpc_client *cli)
 377 {
 378         struct list_head *tmp, *saved;
 379         struct ptlrpc_request *req;
 380         ENTRY;
 381
 382         spin_lock(&cli->cli_lock);
 383         list_for_each_safe(tmp, saved, &cli->cli_sending_head) {
 384                 req = list_entry(tmp, struct ptlrpc_request, rq_list);
 385                 CDEBUG(D_INFO, "Cleaning req %p from sending list.\n", req);
 386                 list_del_init(&req->rq_list);
 387                 req->rq_client = NULL;
 388                 ptlrpc_free_req(req);
 389         }
 390         list_for_each_safe(tmp, saved, &cli->cli_dying_head) {
 391                 req = list_entry(tmp, struct ptlrpc_request, rq_list);
 392                 CERROR("Request %p is on the dying list at cleanup!\n", req);
 393                 list_del_init(&req->rq_list);
 394                 req->rq_client = NULL;
 395                 ptlrpc_free_req(req);
 396         }
 397         spin_unlock(&cli->cli_lock);
 398
 399         EXIT;
 400         return;
 401 }
 402
 403 void ptlrpc_continue_req(struct ptlrpc_request *req)
 404 {
 405         ENTRY;
 406         CDEBUG(D_INODE, "continue delayed request %Ld opc %d\n",
 407                req->rq_xid, req->rq_reqmsg->opc);
 408         wake_up(&req->rq_wait_for_rep);
 409         EXIT;
 410 }
 411
 412 void ptlrpc_resend_req(struct ptlrpc_request *req)
 413 {
 414         ENTRY;
 415         CDEBUG(D_INODE, "resend request %Ld, opc %d\n",
 416                req->rq_xid, req->rq_reqmsg->opc);
 417         req->rq_status = -EAGAIN;
 418         req->rq_level = LUSTRE_CONN_RECOVD;
 419         req->rq_flags |= PTL_RPC_FL_RESEND;
 420         req->rq_flags &= ~PTL_RPC_FL_TIMEOUT;
 421         wake_up(&req->rq_wait_for_rep);
 422         EXIT;
 423 }
 424
 425 void ptlrpc_restart_req(struct ptlrpc_request *req)
 426 {
 427         ENTRY;
 428         CDEBUG(D_INODE, "restart completed request %Ld, opc %d\n",
 429                req->rq_xid, req->rq_reqmsg->opc);
 430         req->rq_status = -ERESTARTSYS;
 431         req->rq_flags |= PTL_RPC_FL_RECOVERY;
 432         req->rq_flags &= ~PTL_RPC_FL_TIMEOUT;
 433         wake_up(&req->rq_wait_for_rep);
 434         EXIT;
 435 }
 436
 437 static int expired_request(void *data)
 438 {
 439         struct ptlrpc_request *req = data;
 440
 441         ENTRY;
 442         CERROR("req timeout on connid %d xid %Ld\n", req->rq_connid,
 443                (unsigned long long)req->rq_xid);
 444         req->rq_timeout = 0;
 445         req->rq_connection->c_level = LUSTRE_CONN_RECOVD;
 446         req->rq_flags |= PTL_RPC_FL_TIMEOUT;
 447         /* Activate the recovd for this client, if there is one. */
 448         if (req->rq_client && req->rq_client->cli_recovd)
 449                 recovd_cli_fail(req->rq_client);
 450
 451         /* If this request is for recovery or other primordial tasks,
 452          * don't go back to sleep.
 453          */
 454         if (req->rq_level < LUSTRE_CONN_FULL)
 455                 RETURN(1);
 456         RETURN(0);
 457 }
 458
 459 static int interrupted_request(void *data)
 460 {
 461         struct ptlrpc_request *req = data;
 462         ENTRY;
 463         req->rq_flags |= PTL_RPC_FL_INTR;
 464         RETURN(1); /* ignored, as of this writing */
 465 }
 466
 467 int ptlrpc_queue_wait(struct ptlrpc_request *req)
 468 {
 469         int rc = 0;
 470         struct l_wait_info lwi;
 471         struct ptlrpc_client *cli = req->rq_client;
 472         ENTRY;
 473
 474         init_waitqueue_head(&req->rq_wait_for_rep);
 475         CDEBUG(D_NET, "subsys: %s req %Ld opc %d level %d, conn level %d\n",
 476                cli->cli_name, req->rq_xid, req->rq_reqmsg->opc, req->rq_level,
 477                req->rq_connection->c_level);
 478
 479         /* XXX probably both an import and connection level are needed */
 480         if (req->rq_level > req->rq_connection->c_level) {
 481                 CERROR("process %d waiting for recovery (%d > %d)\n",
 482                        current->pid, req->rq_level, req->rq_connection->c_level);
 483
 484                 spin_lock(&cli->cli_lock);
 485                 list_del_init(&req->rq_list);
 486                 list_add_tail(&req->rq_list, &cli->cli_delayed_head);
 487                 spin_unlock(&cli->cli_lock);
 488
 489 #warning shaver: what happens when we get interrupted during this wait?
 490                 lwi = LWI_INTR(SIGTERM | SIGKILL | SIGINT, NULL, NULL);
 491                 l_wait_event(req->rq_wait_for_rep,
 492                              req->rq_level <= req->rq_connection->c_level,
 493                              &lwi);
 494
 495                 spin_lock(&cli->cli_lock);
 496                 list_del_init(&req->rq_list);
 497                 spin_unlock(&cli->cli_lock);
 498
 499                 CERROR("process %d resumed\n", current->pid);
 500         }
 501  resend:
 502         req->rq_time = CURRENT_TIME;
 503         req->rq_timeout = 100;
 504         rc = ptl_send_rpc(req);
 505         if (rc) {
 506                 CERROR("error %d, opcode %d\n", rc, req->rq_reqmsg->opc);
 507                 if ( rc > 0 )
 508                         rc = -rc;
 509                 ptlrpc_cleanup_request_buf(req);
 510                 up(&cli->cli_rpc_sem);
 511                 RETURN(-rc);
 512         }
 513
 514         spin_lock(&cli->cli_lock);
 515         list_del_init(&req->rq_list);
 516         list_add_tail(&req->rq_list, &cli->cli_sending_head);
 517         spin_unlock(&cli->cli_lock);
 518
 519         CDEBUG(D_OTHER, "-- sleeping\n");
 520         lwi = LWI_TIMEOUT_INTR(req->rq_timeout * HZ, expired_request,
 521                                SIGKILL | SIGTERM | SIGINT, interrupted_request,
 522                                req);
 523         l_wait_event(req->rq_wait_for_rep, ptlrpc_check_reply(req), &lwi);
 524         CDEBUG(D_OTHER, "-- done\n");
 525
 526         /* Don't resend if we were interrupted. */
 527         if ((req->rq_flags & (PTL_RPC_FL_RESEND | PTL_RPC_FL_INTR)) ==
 528             PTL_RPC_FL_RESEND) {
 529                 req->rq_flags &= ~PTL_RPC_FL_RESEND;
 530                 goto resend;
 531         }
 532
 533         up(&cli->cli_rpc_sem);
 534         if (req->rq_flags & PTL_RPC_FL_INTR) {
 535                 if (!(req->rq_flags & PTL_RPC_FL_TIMEOUT))
 536                         LBUG(); /* should only be interrupted if we timed out. */
 537                 /* Clean up the dangling reply buffers */
 538                 ptlrpc_abort(req);
 539                 GOTO(out, rc = -EINTR);
 540         }
 541
 542         if (req->rq_flags & PTL_RPC_FL_TIMEOUT)
 543                 GOTO(out, rc = -ETIMEDOUT);
 544
 545         if (!(req->rq_flags & PTL_RPC_FL_REPLIED))
 546                 GOTO(out, rc = req->rq_status);
 547
 548         rc = lustre_unpack_msg(req->rq_repmsg, req->rq_replen);
 549         if (rc) {
 550                 CERROR("unpack_rep failed: %d\n", rc);
 551                 GOTO(out, rc);
 552         }
 553         CDEBUG(D_NET, "got rep %Ld\n", req->rq_xid);
 554         if (req->rq_repmsg->status == 0)
 555                 CDEBUG(D_NET, "--> buf %p len %d status %d\n", req->rq_repmsg,
 556                        req->rq_replen, req->rq_repmsg->status);
 557
 558         spin_lock(&cli->cli_lock);
 559         cli->cli_last_xid = req->rq_repmsg->last_xid;
 560         cli->cli_last_committed = req->rq_repmsg->last_committed;
 561         ptlrpc_free_committed(cli);
 562         spin_unlock(&cli->cli_lock);
 563
 564         EXIT;
 565  out:
 566         return rc;
 567 }
 568
 569 int ptlrpc_replay_req(struct ptlrpc_request *req)
 570 {
 571         int rc = 0;
 572         struct ptlrpc_client *cli = req->rq_client;
 573         struct l_wait_info lwi = LWI_INTR(SIGKILL|SIGTERM|SIGINT, NULL, NULL);
 574         ENTRY;
 575
 576         init_waitqueue_head(&req->rq_wait_for_rep);
 577         CDEBUG(D_NET, "req %Ld opc %d level %d, conn level %d\n",
 578                req->rq_xid, req->rq_reqmsg->opc, req->rq_level,
 579                req->rq_connection->c_level);
 580
 581         req->rq_time = CURRENT_TIME;
 582         req->rq_timeout = 100;
 583         rc = ptl_send_rpc(req);
 584         if (rc) {
 585                 CERROR("error %d, opcode %d\n", rc, req->rq_reqmsg->opc);
 586                 ptlrpc_cleanup_request_buf(req);
 587                 up(&cli->cli_rpc_sem);
 588                 RETURN(-rc);
 589         }
 590
 591         CDEBUG(D_OTHER, "-- sleeping\n");
 592         l_wait_event(req->rq_wait_for_rep, ptlrpc_check_reply(req), &lwi);
 593         CDEBUG(D_OTHER, "-- done\n");
 594
 595         up(&cli->cli_rpc_sem);
 596
 597         if (!(req->rq_flags & PTL_RPC_FL_REPLIED)) {
 598                 CERROR("Unknown reason for wakeup\n");
 599                 /* XXX Phil - I end up here when I kill obdctl */
 600                 ptlrpc_abort(req);
 601                 GOTO(out, rc = -EINTR);
 602         }
 603
 604         rc = lustre_unpack_msg(req->rq_repmsg, req->rq_replen);
 605         if (rc) {
 606                 CERROR("unpack_rep failed: %d\n", rc);
 607                 GOTO(out, rc);
 608         }
 609
 610         CDEBUG(D_NET, "got rep %Ld\n", req->rq_xid);
 611         if (req->rq_repmsg->status == 0)
 612                 CDEBUG(D_NET, "--> buf %p len %d status %d\n", req->rq_repmsg,
 613                        req->rq_replen, req->rq_repmsg->status);
 614         else {
 615                 CERROR("recovery failed: ");
 616                 CERROR("req %Ld opc %d level %d, conn level %d\n",
 617                        req->rq_xid, req->rq_reqmsg->opc, req->rq_level,
 618                        req->rq_connection->c_level);
 619                 LBUG();
 620         }
 621
 622  out:
 623         RETURN(rc);
 624 }