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_RESEND) {
 273                 if (l_killable_pending(current)) {
 274                         CERROR("-- INTR --\n");
 275                         req->rq_flags |= PTL_RPC_FL_INTR;
 276                         GOTO(out, rc = 1);
 277                 }
 278                 CERROR("-- RESEND --\n");
 279                 GOTO(out, rc = 1);
 280         }
 281
 282         if (req->rq_flags & PTL_RPC_FL_RECOVERY) {
 283                 CERROR("-- RESTART --\n");
 284                 GOTO(out, rc = 1);
 285         }
 286
 287         if (req->rq_flags & PTL_RPC_FL_TIMEOUT && l_killable_pending(current)) {
 288                 req->rq_flags |= PTL_RPC_FL_INTR;
 289                 GOTO(out, rc = 1);
 290         }
 291
 292         if (req->rq_timeout &&
 293             (CURRENT_TIME - req->rq_time >= req->rq_timeout)) {
 294                 CERROR("-- REQ TIMEOUT ON CONNID %d XID %Ld --\n",
 295                        req->rq_connid, (unsigned long long)req->rq_xid);
 296                 /* clear the timeout */
 297                 req->rq_timeout = 0;
 298                 req->rq_connection->c_level = LUSTRE_CONN_RECOVD;
 299                 req->rq_flags |= PTL_RPC_FL_TIMEOUT;
 300                 if (req->rq_client && req->rq_client->cli_recovd)
 301                         recovd_cli_fail(req->rq_client);
 302                 if (req->rq_level < LUSTRE_CONN_FULL) {
 303                         rc = 1;
 304                 } else if (l_killable_pending(current)) {
 305                         req->rq_flags |= PTL_RPC_FL_INTR;
 306                         rc = 1;
 307                 } else {
 308                         rc = 0;
 309                 }
 310                 GOTO(out, rc);
 311         }
 312
 313  out:
 314         CDEBUG(D_NET, "req = %p, rc = %d\n", req, rc);
 315         return rc;
 316 }
 317
 318 int ptlrpc_check_status(struct ptlrpc_request *req, int err)
 319 {
 320         ENTRY;
 321
 322         if (err != 0) {
 323                 CERROR("err is %d\n", err);
 324                 RETURN(err);
 325         }
 326
 327         if (req == NULL) {
 328                 CERROR("req == NULL\n");
 329                 RETURN(-ENOMEM);
 330         }
 331
 332         if (req->rq_repmsg == NULL) {
 333                 CERROR("req->rq_repmsg == NULL\n");
 334                 RETURN(-ENOMEM);
 335         }
 336
 337         if (req->rq_repmsg->type == NTOH__u32(PTL_RPC_MSG_ERR)) {
 338                 CERROR("req->rq_repmsg->type == PTL_RPC_MSG_ERR\n");
 339                 RETURN(-EINVAL);
 340         }
 341
 342         if (req->rq_repmsg->status != 0) {
 343                 if (req->rq_repmsg->status < 0)
 344                         CERROR("req->rq_repmsg->status is %d\n",
 345                                req->rq_repmsg->status);
 346                 else
 347                         CDEBUG(D_INFO, "req->rq_repmsg->status is %d\n",
 348                                req->rq_repmsg->status);
 349                 /* XXX: translate this error from net to host */
 350                 RETURN(req->rq_repmsg->status);
 351         }
 352
 353         RETURN(0);
 354 }
 355
 356 static void ptlrpc_cleanup_request_buf(struct ptlrpc_request *request)
 357 {
 358         OBD_FREE(request->rq_reqmsg, request->rq_reqlen);
 359         request->rq_reqmsg = NULL;
 360         request->rq_reqlen = 0;
 361 }
 362
 363 /* Abort this request and cleanup any resources associated with it. */
 364 static int ptlrpc_abort(struct ptlrpc_request *request)
 365 {
 366         /* First remove the ME for the reply; in theory, this means
 367          * that we can tear down the buffer safely. */
 368         PtlMEUnlink(request->rq_reply_me_h);
 369         OBD_FREE(request->rq_reply_md.start, request->rq_replen);
 370         request->rq_repmsg = NULL;
 371         request->rq_replen = 0;
 372         return 0;
 373 }
 374
 375 /* caller must lock cli */
 376 void ptlrpc_free_committed(struct ptlrpc_client *cli)
 377 {
 378         struct list_head *tmp, *saved;
 379         struct ptlrpc_request *req;
 380
 381         list_for_each_safe(tmp, saved, &cli->cli_sending_head) {
 382                 req = list_entry(tmp, struct ptlrpc_request, rq_list);
 383
 384                 if ( (req->rq_flags & PTL_RPC_FL_REPLAY) ) {
 385                         CDEBUG(D_INFO, "Retaining request %Ld for replay\n",
 386                                req->rq_xid);
 387                         continue;
 388                 }
 389
 390                 /* not yet committed */
 391                 if (req->rq_transno > cli->cli_last_committed)
 392                         break;
 393
 394                 CDEBUG(D_INFO, "Marking request %Ld as committed ("
 395                        "transno=%Lu, last_committed=%Lu\n",
 396                        req->rq_xid, req->rq_transno,
 397                        cli->cli_last_committed);
 398                 if (atomic_dec_and_test(&req->rq_refcount)) {
 399                         /* we do this to prevent free_req deadlock */
 400                         list_del_init(&req->rq_list);
 401                         req->rq_client = NULL;
 402                         ptlrpc_free_req(req);
 403                 } else {
 404                         list_del_init(&req->rq_list);
 405                         list_add(&req->rq_list, &cli->cli_dying_head);
 406                 }
 407         }
 408
 409         EXIT;
 410         return;
 411 }
 412
 413 void ptlrpc_cleanup_client(struct ptlrpc_client *cli)
 414 {
 415         struct list_head *tmp, *saved;
 416         struct ptlrpc_request *req;
 417         ENTRY;
 418
 419         spin_lock(&cli->cli_lock);
 420         list_for_each_safe(tmp, saved, &cli->cli_sending_head) {
 421                 req = list_entry(tmp, struct ptlrpc_request, rq_list);
 422                 CDEBUG(D_INFO, "Cleaning req %p from sending list.\n", req);
 423                 list_del_init(&req->rq_list);
 424                 req->rq_client = NULL;
 425                 ptlrpc_free_req(req);
 426         }
 427         list_for_each_safe(tmp, saved, &cli->cli_dying_head) {
 428                 req = list_entry(tmp, struct ptlrpc_request, rq_list);
 429                 CERROR("Request %p is on the dying list at cleanup!\n", req);
 430                 list_del_init(&req->rq_list);
 431                 req->rq_client = NULL;
 432                 ptlrpc_free_req(req);
 433         }
 434         spin_unlock(&cli->cli_lock);
 435
 436         EXIT;
 437         return;
 438 }
 439
 440 void ptlrpc_continue_req(struct ptlrpc_request *req)
 441 {
 442         ENTRY;
 443         CDEBUG(D_INODE, "continue delayed request %Ld opc %d\n",
 444                req->rq_xid, req->rq_reqmsg->opc);
 445         wake_up(&req->rq_wait_for_rep);
 446         EXIT;
 447 }
 448
 449 void ptlrpc_resend_req(struct ptlrpc_request *req)
 450 {
 451         ENTRY;
 452         CDEBUG(D_INODE, "resend request %Ld, opc %d\n",
 453                req->rq_xid, req->rq_reqmsg->opc);
 454         req->rq_status = -EAGAIN;
 455         req->rq_level = LUSTRE_CONN_RECOVD;
 456         req->rq_flags |= PTL_RPC_FL_RESEND;
 457         req->rq_flags &= ~PTL_RPC_FL_TIMEOUT;
 458         wake_up(&req->rq_wait_for_rep);
 459         EXIT;
 460 }
 461
 462 void ptlrpc_restart_req(struct ptlrpc_request *req)
 463 {
 464         ENTRY;
 465         CDEBUG(D_INODE, "restart completed request %Ld, opc %d\n",
 466                req->rq_xid, req->rq_reqmsg->opc);
 467         req->rq_status = -ERESTARTSYS;
 468         req->rq_flags |= PTL_RPC_FL_RECOVERY;
 469         req->rq_flags &= ~PTL_RPC_FL_TIMEOUT;
 470         wake_up(&req->rq_wait_for_rep);
 471         EXIT;
 472 }
 473
 474 int ptlrpc_queue_wait(struct ptlrpc_request *req)
 475 {
 476         int rc = 0, timeout;
 477         struct ptlrpc_client *cli = req->rq_client;
 478         ENTRY;
 479
 480         init_waitqueue_head(&req->rq_wait_for_rep);
 481         CDEBUG(D_NET, "subsys: %s req %Ld opc %d level %d, conn level %d\n",
 482                cli->cli_name, req->rq_xid, req->rq_reqmsg->opc, req->rq_level,
 483                req->rq_connection->c_level);
 484
 485         /* XXX probably both an import and connection level are needed */
 486         if (req->rq_level > req->rq_connection->c_level) {
 487                 CERROR("process %d waiting for recovery (%d > %d)\n",
 488                        current->pid, req->rq_level, req->rq_connection->c_level);
 489                 spin_lock(&cli->cli_lock);
 490                 list_del_init(&req->rq_list);
 491                 list_add(&req->rq_list, cli->cli_delayed_head.prev);
 492                 spin_unlock(&cli->cli_lock);
 493                 l_wait_event_killable
 494                         (req->rq_wait_for_rep,
 495                          req->rq_level <= req->rq_connection->c_level);
 496                 spin_lock(&cli->cli_lock);
 497                 list_del_init(&req->rq_list);
 498                 spin_unlock(&cli->cli_lock);
 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         /*
 521          * req->rq_timeout gets reset in the timeout case, and
 522          * l_wait_event_timeout is a macro, so save the timeout value here.
 523          */
 524         timeout = req->rq_timeout * HZ;
 525         l_wait_event_timeout(req->rq_wait_for_rep, ptlrpc_check_reply(req),
 526                              timeout);
 527         CDEBUG(D_OTHER, "-- done\n");
 528
 529         if (req->rq_flags & PTL_RPC_FL_RESEND) {
 530                 req->rq_flags &= ~PTL_RPC_FL_RESEND;
 531                 goto resend;
 532         }
 533
 534         up(&cli->cli_rpc_sem);
 535         if (req->rq_flags & PTL_RPC_FL_INTR) {
 536                 /* Clean up the dangling reply buffers */
 537                 ptlrpc_abort(req);
 538                 GOTO(out, rc = -EINTR);
 539         }
 540
 541         if (req->rq_flags & PTL_RPC_FL_TIMEOUT)
 542                 GOTO(out, rc = -ETIMEDOUT);
 543
 544         if (!(req->rq_flags & PTL_RPC_FL_REPLIED))
 545                 GOTO(out, rc = req->rq_status);
 546
 547         rc = lustre_unpack_msg(req->rq_repmsg, req->rq_replen);
 548         if (rc) {
 549                 CERROR("unpack_rep failed: %d\n", rc);
 550                 GOTO(out, rc);
 551         }
 552         CDEBUG(D_NET, "got rep %Ld\n", req->rq_xid);
 553         if (req->rq_repmsg->status == 0)
 554                 CDEBUG(D_NET, "--> buf %p len %d status %d\n", req->rq_repmsg,
 555                        req->rq_replen, req->rq_repmsg->status);
 556
 557         spin_lock(&cli->cli_lock);
 558         cli->cli_last_rcvd = req->rq_repmsg->last_rcvd;
 559         cli->cli_last_committed = req->rq_repmsg->last_committed;
 560         ptlrpc_free_committed(cli);
 561         spin_unlock(&cli->cli_lock);
 562
 563         EXIT;
 564  out:
 565         return rc;
 566 }
 567
 568 int ptlrpc_replay_req(struct ptlrpc_request *req)
 569 {
 570         int rc = 0;
 571         struct ptlrpc_client *cli = req->rq_client;
 572         ENTRY;
 573
 574         init_waitqueue_head(&req->rq_wait_for_rep);
 575         CDEBUG(D_NET, "req %Ld opc %d level %d, conn level %d\n",
 576                req->rq_xid, req->rq_reqmsg->opc, req->rq_level,
 577                req->rq_connection->c_level);
 578
 579         req->rq_time = CURRENT_TIME;
 580         req->rq_timeout = 100;
 581         rc = ptl_send_rpc(req);
 582         if (rc) {
 583                 CERROR("error %d, opcode %d\n", rc, req->rq_reqmsg->opc);
 584                 ptlrpc_cleanup_request_buf(req);
 585                 up(&cli->cli_rpc_sem);
 586                 RETURN(-rc);
 587         }
 588
 589         CDEBUG(D_OTHER, "-- sleeping\n");
 590         l_wait_event_killable(req->rq_wait_for_rep, ptlrpc_check_reply(req));
 591         CDEBUG(D_OTHER, "-- done\n");
 592
 593         up(&cli->cli_rpc_sem);
 594
 595         if (!(req->rq_flags & PTL_RPC_FL_REPLIED)) {
 596                 CERROR("Unknown reason for wakeup\n");
 597                 /* XXX Phil - I end up here when I kill obdctl */
 598                 ptlrpc_abort(req);
 599                 GOTO(out, rc = -EINTR);
 600         }
 601
 602         rc = lustre_unpack_msg(req->rq_repmsg, req->rq_replen);
 603         if (rc) {
 604                 CERROR("unpack_rep failed: %d\n", rc);
 605                 GOTO(out, rc);
 606         }
 607
 608         CDEBUG(D_NET, "got rep %Ld\n", req->rq_xid);
 609         if (req->rq_repmsg->status == 0)
 610                 CDEBUG(D_NET, "--> buf %p len %d status %d\n", req->rq_repmsg,
 611                        req->rq_replen, req->rq_repmsg->status);
 612         else {
 613                 CERROR("recovery failed: ");
 614                 CERROR("req %Ld opc %d level %d, conn level %d\n",
 615                        req->rq_xid, req->rq_reqmsg->opc, req->rq_level,
 616                        req->rq_connection->c_level);
 617                 LBUG();
 618         }
 619
 620  out:
 621         RETURN(rc);
 622 }