lustre/ptlrpc/niobuf.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  *  Copyright (c) 2002, 2003 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 #ifndef __KERNEL__
  25 #include <liblustre.h>
  26 #endif
  27 #include <linux/obd_support.h>
  28 #include <linux/lustre_net.h>
  29 #include <linux/lustre_lib.h>
  30 #include <linux/obd.h>
  31 #include "ptlrpc_internal.h"
  32
  33 static int ptl_send_buf (ptl_handle_md_t *mdh, void *base, int len,
  34                          ptl_ack_req_t ack, struct ptlrpc_cb_id *cbid,
  35                          struct ptlrpc_connection *conn, int portal, __u64 xid)
  36 {
  37         ptl_process_id_t remote_id;
  38         int              rc;
  39         int              rc2;
  40         ptl_md_t         md;
  41         char str[PTL_NALFMT_SIZE];
  42         ENTRY;
  43
  44         LASSERT (portal != 0);
  45         LASSERT (conn != NULL);
  46         CDEBUG (D_INFO, "conn=%p ni %s nid %s on %s\n",
  47                 conn, conn->c_peer.peer_ni->pni_name,
  48                 ptlrpc_peernid2str(&conn->c_peer, str),
  49                 conn->c_peer.peer_ni->pni_name);
  50
  51         remote_id.nid = conn->c_peer.peer_nid,
  52         remote_id.pid = 0;
  53
  54         md.start     = base;
  55         md.length    = len;
  56         md.threshold = (ack == PTL_ACK_REQ) ? 2 : 1;
  57         md.options   = PTLRPC_MD_OPTIONS;
  58         md.user_ptr  = cbid;
  59         md.eventq    = conn->c_peer.peer_ni->pni_eq_h;
  60
  61         if (ack == PTL_ACK_REQ &&
  62             OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_ACK | OBD_FAIL_ONCE)) {
  63                 /* don't ask for the ack to simulate failing client */
  64                 ack = PTL_NOACK_REQ;
  65                 obd_fail_loc |= OBD_FAIL_ONCE | OBD_FAILED;
  66         }
  67
  68         rc = PtlMDBind (conn->c_peer.peer_ni->pni_ni_h, md,
  69                         PTL_UNLINK, mdh);
  70         if (rc != PTL_OK) {
  71                 CERROR ("PtlMDBind failed: %d\n", rc);
  72                 LASSERT (rc == PTL_NO_SPACE);
  73                 RETURN (-ENOMEM);
  74         }
  75
  76         CDEBUG(D_NET, "Sending %d bytes to portal %d, xid "LPD64"\n",
  77                len, portal, xid);
  78
  79         rc2 = PtlPut (*mdh, ack, remote_id, portal, 0, xid, 0, 0);
  80         if (rc != PTL_OK) {
  81                 /* We're going to get an UNLINK event when I unlink below,
  82                  * which will complete just like any other failed send, so
  83                  * I fall through and return success here! */
  84                 CERROR("PtlPut(%s, %d, "LPD64") failed: %d\n",
  85                        ptlrpc_peernid2str(&conn->c_peer, str),
  86                        portal, xid, rc);
  87                 rc2 = PtlMDUnlink(*mdh);
  88                 LASSERT (rc2 == PTL_OK);
  89         }
  90
  91         RETURN (0);
  92 }
  93
  94 int ptlrpc_start_bulk_transfer (struct ptlrpc_bulk_desc *desc)
  95 {
  96         int                 rc;
  97         int                 rc2;
  98         struct ptlrpc_peer *peer;
  99         ptl_process_id_t    remote_id;
 100         ptl_md_t            md;
 101         __u64               xid;
 102         char                str[PTL_NALFMT_SIZE];
 103         ENTRY;
 104
 105         if (OBD_FAIL_CHECK_ONCE(OBD_FAIL_PTLRPC_BULK_PUT_NET))
 106                 RETURN(0);
 107
 108         /* NB no locking required until desc is on the network */
 109         LASSERT (!desc->bd_network_rw);
 110         LASSERT (desc->bd_type == BULK_PUT_SOURCE ||
 111                  desc->bd_type == BULK_GET_SINK);
 112         desc->bd_success = 0;
 113         peer = &desc->bd_export->exp_connection->c_peer;
 114
 115         md.user_ptr = &desc->bd_cbid;
 116         md.eventq = peer->peer_ni->pni_eq_h;
 117         md.threshold = 2; /* SENT and ACK/REPLY */
 118         md.options = PTLRPC_MD_OPTIONS;
 119         ptlrpc_fill_bulk_md(&md, desc);
 120
 121         LASSERT (desc->bd_cbid.cbid_fn == server_bulk_callback);
 122         LASSERT (desc->bd_cbid.cbid_arg == desc);
 123
 124         /* NB total length may be 0 for a read past EOF, so we send a 0
 125          * length bulk, since the client expects a bulk event. */
 126
 127         rc = PtlMDBind(peer->peer_ni->pni_ni_h, md,
 128                        PTL_UNLINK, &desc->bd_md_h);
 129         if (rc != PTL_OK) {
 130                 CERROR("PtlMDBind failed: %d\n", rc);
 131                 LASSERT (rc == PTL_NO_SPACE);
 132                 RETURN(-ENOMEM);
 133         }
 134
 135         /* Client's bulk and reply matchbits are the same */
 136         xid = desc->bd_req->rq_xid;
 137         remote_id.nid = peer->peer_nid;
 138         remote_id.pid = 0;
 139
 140         CDEBUG(D_NET, "Transferring %u pages %u bytes via portal %d on %s "
 141                "nid %s pid %d xid "LPX64"\n", desc->bd_iov_count,
 142                desc->bd_nob, desc->bd_portal, peer->peer_ni->pni_name,
 143                ptlrpc_peernid2str(peer, str), remote_id.pid, xid);
 144
 145         /* Network is about to get at the memory */
 146         desc->bd_network_rw = 1;
 147
 148         if (desc->bd_type == BULK_PUT_SOURCE)
 149                 rc = PtlPut (desc->bd_md_h, PTL_ACK_REQ, remote_id,
 150                              desc->bd_portal, 0, xid, 0, 0);
 151         else
 152                 rc = PtlGet (desc->bd_md_h, remote_id,
 153                              desc->bd_portal, 0, xid, 0);
 154
 155         if (rc != PTL_OK) {
 156                 /* Can't send, so we unlink the MD bound above.  The UNLINK
 157                  * event this creates will signal completion with failure,
 158                  * so we return SUCCESS here! */
 159                 CERROR("Transfer(%s, %d, "LPX64") failed: %d\n",
 160                        ptlrpc_peernid2str(peer, str),
 161                        desc->bd_portal, xid, rc);
 162                 rc2 = PtlMDUnlink(desc->bd_md_h);
 163                 LASSERT (rc2 == PTL_OK);
 164         }
 165
 166         RETURN(0);
 167 }
 168
 169 void ptlrpc_abort_bulk (struct ptlrpc_bulk_desc *desc)
 170 {
 171         /* Server side bulk abort. Idempotent. Not thread-safe (i.e. only
 172          * serialises with completion callback) */
 173         struct l_wait_info lwi;
 174         int                rc;
 175
 176         LASSERT (!in_interrupt ());             /* might sleep */
 177
 178         if (!ptlrpc_bulk_active(desc))          /* completed or */
 179                 return;                         /* never started */
 180
 181         /* The unlink ensures the callback happens ASAP and is the last
 182          * one.  If it fails, it must be because completion just happened,
 183          * but we must still l_wait_event() in this case, to give liblustre
 184          * a chance to run server_bulk_callback()*/
 185
 186         PtlMDUnlink (desc->bd_md_h);
 187
 188         for (;;) {
 189                 /* Network access will complete in finite time but the HUGE
 190                  * timeout lets us CWARN for visibility of sluggish NALs */
 191                 lwi = LWI_TIMEOUT (300 * HZ, NULL, NULL);
 192                 rc = l_wait_event(desc->bd_waitq,
 193                                   !ptlrpc_bulk_active(desc), &lwi);
 194                 if (rc == 0)
 195                         return;
 196
 197                 LASSERT(rc == -ETIMEDOUT);
 198                 CWARN("Unexpectedly long timeout: desc %p\n", desc);
 199         }
 200 }
 201
 202 int ptlrpc_register_bulk (struct ptlrpc_request *req)
 203 {
 204         struct ptlrpc_bulk_desc *desc = req->rq_bulk;
 205         struct ptlrpc_peer *peer;
 206         int rc;
 207         int rc2;
 208         ptl_process_id_t source_id;
 209         ptl_handle_me_t  me_h;
 210         ptl_md_t         md;
 211         ENTRY;
 212
 213         if (OBD_FAIL_CHECK_ONCE(OBD_FAIL_PTLRPC_BULK_GET_NET))
 214                 RETURN(0);
 215
 216         /* NB no locking required until desc is on the network */
 217         LASSERT (desc->bd_nob > 0);
 218         LASSERT (!desc->bd_network_rw);
 219         LASSERT (desc->bd_iov_count <= PTLRPC_MAX_BRW_PAGES);
 220         LASSERT (desc->bd_req != NULL);
 221         LASSERT (desc->bd_type == BULK_PUT_SINK ||
 222                  desc->bd_type == BULK_GET_SOURCE);
 223
 224         desc->bd_success = 0;
 225
 226         peer = &desc->bd_import->imp_connection->c_peer;
 227
 228         md.user_ptr = &desc->bd_cbid;
 229         md.eventq = peer->peer_ni->pni_eq_h;
 230         md.threshold = 1;                       /* PUT or GET */
 231         md.options = PTLRPC_MD_OPTIONS |
 232                      ((desc->bd_type == BULK_GET_SOURCE) ?
 233                       PTL_MD_OP_GET : PTL_MD_OP_PUT);
 234         ptlrpc_fill_bulk_md(&md, desc);
 235
 236         LASSERT (desc->bd_cbid.cbid_fn == client_bulk_callback);
 237         LASSERT (desc->bd_cbid.cbid_arg == desc);
 238
 239         /* XXX Registering the same xid on retried bulk makes my head
 240          * explode trying to understand how the original request's bulk
 241          * might interfere with the retried request -eeb */
 242         LASSERT (!desc->bd_registered || req->rq_xid != desc->bd_last_xid);
 243         desc->bd_registered = 1;
 244         desc->bd_last_xid = req->rq_xid;
 245
 246         source_id.nid = desc->bd_import->imp_connection->c_peer.peer_nid;
 247         source_id.pid = PTL_PID_ANY;
 248
 249         rc = PtlMEAttach(peer->peer_ni->pni_ni_h,
 250                          desc->bd_portal, source_id, req->rq_xid, 0,
 251                          PTL_UNLINK, PTL_INS_AFTER, &me_h);
 252         if (rc != PTL_OK) {
 253                 CERROR("PtlMEAttach failed: %d\n", rc);
 254                 LASSERT (rc == PTL_NO_SPACE);
 255                 RETURN (-ENOMEM);
 256         }
 257
 258         /* About to let the network at it... */
 259         desc->bd_network_rw = 1;
 260         rc = PtlMDAttach(me_h, md, PTL_UNLINK, &desc->bd_md_h);
 261         if (rc != PTL_OK) {
 262                 CERROR("PtlMDAttach failed: %d\n", rc);
 263                 LASSERT (rc == PTL_NO_SPACE);
 264                 desc->bd_network_rw = 0;
 265                 rc2 = PtlMEUnlink (me_h);
 266                 LASSERT (rc2 == PTL_OK);
 267                 RETURN (-ENOMEM);
 268         }
 269
 270         CDEBUG(D_NET, "Setup bulk %s buffers: %u pages %u bytes, xid "LPX64", "
 271                "portal %u on %s\n",
 272                desc->bd_type == BULK_GET_SOURCE ? "get-source" : "put-sink",
 273                desc->bd_iov_count, desc->bd_nob,
 274                req->rq_xid, desc->bd_portal, peer->peer_ni->pni_name);
 275         RETURN(0);
 276 }
 277
 278 void ptlrpc_unregister_bulk (struct ptlrpc_request *req)
 279 {
 280         /* Disconnect a bulk desc from the network. Idempotent. Not
 281          * thread-safe (i.e. only interlocks with completion callback). */
 282         struct ptlrpc_bulk_desc *desc = req->rq_bulk;
 283         wait_queue_head_t       *wq;
 284         struct l_wait_info       lwi;
 285         int                      rc;
 286
 287         LASSERT (!in_interrupt ());             /* might sleep */
 288
 289         if (!ptlrpc_bulk_active(desc))          /* completed or */
 290                 return;                         /* never registered */
 291
 292         LASSERT (desc->bd_req == req);          /* bd_req NULL until registered */
 293
 294         /* the unlink ensures the callback happens ASAP and is the last
 295          * one.  If it fails, it must be because completion just happened,
 296          * but we must still l_wait_event() in this case to give liblustre
 297          * a chance to run client_bulk_callback() */
 298
 299         PtlMDUnlink (desc->bd_md_h);
 300
 301         if (desc->bd_req->rq_set != NULL)
 302                 wq = &req->rq_set->set_waitq;
 303         else
 304                 wq = &req->rq_reply_waitq;
 305
 306         for (;;) {
 307                 /* Network access will complete in finite time but the HUGE
 308                  * timeout lets us CWARN for visibility of sluggish NALs */
 309                 lwi = LWI_TIMEOUT (300 * HZ, NULL, NULL);
 310                 rc = l_wait_event(*wq, !ptlrpc_bulk_active(desc), &lwi);
 311                 if (rc == 0)
 312                         return;
 313
 314                 LASSERT (rc == -ETIMEDOUT);
 315                 CWARN("Unexpectedly long timeout: desc %p\n", desc);
 316         }
 317 }
 318
 319 int ptlrpc_send_reply (struct ptlrpc_request *req, int may_be_difficult)
 320 {
 321         struct ptlrpc_service     *svc = req->rq_rqbd->rqbd_srv_ni->sni_service;
 322         struct ptlrpc_reply_state *rs = req->rq_reply_state;
 323         struct ptlrpc_connection  *conn;
 324         int                        rc;
 325
 326         /* We must already have a reply buffer (only ptlrpc_error() may be
 327          * called without one).  We must also have a request buffer which
 328          * is either the actual (swabbed) incoming request, or a saved copy
 329          * if this is a req saved in target_queue_final_reply(). */
 330         LASSERT (req->rq_reqmsg != NULL);
 331         LASSERT (rs != NULL);
 332         LASSERT (req->rq_repmsg != NULL);
 333         LASSERT (may_be_difficult || !rs->rs_difficult);
 334         LASSERT (req->rq_repmsg == &rs->rs_msg);
 335         LASSERT (rs->rs_cb_id.cbid_fn == reply_out_callback);
 336         LASSERT (rs->rs_cb_id.cbid_arg == rs);
 337
 338         LASSERT (req->rq_repmsg != NULL);
 339         if (req->rq_type != PTL_RPC_MSG_ERR)
 340                 req->rq_type = PTL_RPC_MSG_REPLY;
 341
 342         req->rq_repmsg->type   = req->rq_type;
 343         req->rq_repmsg->status = req->rq_status;
 344         req->rq_repmsg->opc    = req->rq_reqmsg->opc;
 345
 346         if (req->rq_export == NULL)
 347                 conn = ptlrpc_get_connection(&req->rq_peer, NULL);
 348         else
 349                 conn = ptlrpc_connection_addref(req->rq_export->exp_connection);
 350
 351         atomic_inc (&svc->srv_outstanding_replies);
 352
 353         rc = ptl_send_buf (&rs->rs_md_h, req->rq_repmsg, req->rq_replen,
 354                            rs->rs_difficult ? PTL_ACK_REQ : PTL_NOACK_REQ,
 355                            &rs->rs_cb_id, conn,
 356                            svc->srv_rep_portal, req->rq_xid);
 357         if (rc != 0) {
 358                 atomic_dec (&svc->srv_outstanding_replies);
 359
 360                 if (!rs->rs_difficult) {
 361                         /* Callers other than target_send_reply() expect me
 362                          * to clean up on a comms error */
 363                         lustre_free_reply_state (rs);
 364                         req->rq_reply_state = NULL;
 365                         req->rq_repmsg = NULL;
 366                 }
 367         }
 368         ptlrpc_put_connection(conn);
 369         return rc;
 370 }
 371
 372 int ptlrpc_reply (struct ptlrpc_request *req)
 373 {
 374         return (ptlrpc_send_reply (req, 0));
 375 }
 376
 377 int ptlrpc_error(struct ptlrpc_request *req)
 378 {
 379         int rc;
 380         ENTRY;
 381
 382         if (!req->rq_repmsg) {
 383                 rc = lustre_pack_reply(req, 0, NULL, NULL);
 384                 if (rc)
 385                         RETURN(rc);
 386         }
 387
 388         req->rq_type = PTL_RPC_MSG_ERR;
 389
 390         rc = ptlrpc_send_reply (req, 0);
 391         RETURN(rc);
 392 }
 393
 394 int ptl_send_rpc(struct ptlrpc_request *request)
 395 {
 396         int rc;
 397         int rc2;
 398         struct ptlrpc_connection *connection;
 399         unsigned long flags;
 400         ptl_process_id_t source_id;
 401         ptl_handle_me_t  reply_me_h;
 402         ptl_md_t         reply_md;
 403         ENTRY;
 404
 405         LASSERT (request->rq_type == PTL_RPC_MSG_REQUEST);
 406
 407         /* If this is a re-transmit, we're required to have disengaged
 408          * cleanly from the previous attempt */
 409         LASSERT (!request->rq_receiving_reply);
 410
 411         connection = request->rq_import->imp_connection;
 412
 413         if (request->rq_bulk != NULL) {
 414                 rc = ptlrpc_register_bulk (request);
 415                 if (rc != 0)
 416                         RETURN(rc);
 417         }
 418
 419         request->rq_reqmsg->handle = request->rq_import->imp_remote_handle;
 420         request->rq_reqmsg->type = PTL_RPC_MSG_REQUEST;
 421         request->rq_reqmsg->conn_cnt = request->rq_import->imp_conn_cnt;
 422
 423         source_id.nid = connection->c_peer.peer_nid;
 424         source_id.pid = PTL_PID_ANY;
 425
 426         LASSERT (request->rq_replen != 0);
 427         if (request->rq_repmsg == NULL)
 428                 OBD_ALLOC(request->rq_repmsg, request->rq_replen);
 429         if (request->rq_repmsg == NULL)
 430                 GOTO(cleanup_bulk, rc = -ENOMEM);
 431
 432         rc = PtlMEAttach(connection->c_peer.peer_ni->pni_ni_h,
 433                          request->rq_reply_portal, /* XXX FIXME bug 249 */
 434                          source_id, request->rq_xid, 0, PTL_UNLINK,
 435                          PTL_INS_AFTER, &reply_me_h);
 436         if (rc != PTL_OK) {
 437                 CERROR("PtlMEAttach failed: %d\n", rc);
 438                 LASSERT (rc == PTL_NO_SPACE);
 439                 GOTO(cleanup_repmsg, rc = -ENOMEM);
 440         }
 441
 442         spin_lock_irqsave (&request->rq_lock, flags);
 443         /* If the MD attach succeeds, there _will_ be a reply_in callback */
 444         request->rq_receiving_reply = 1;
 445         /* Clear any flags that may be present from previous sends. */
 446         request->rq_replied = 0;
 447         request->rq_err = 0;
 448         request->rq_timedout = 0;
 449         request->rq_net_err = 0;
 450         request->rq_resend = 0;
 451         request->rq_restart = 0;
 452         spin_unlock_irqrestore (&request->rq_lock, flags);
 453
 454         reply_md.start     = request->rq_repmsg;
 455         reply_md.length    = request->rq_replen;
 456         reply_md.threshold = 1;
 457         reply_md.options   = PTLRPC_MD_OPTIONS | PTL_MD_OP_PUT;
 458         reply_md.user_ptr  = &request->rq_reply_cbid;
 459         reply_md.eventq    = connection->c_peer.peer_ni->pni_eq_h;
 460
 461         rc = PtlMDAttach(reply_me_h, reply_md, PTL_UNLINK,
 462                          &request->rq_reply_md_h);
 463         if (rc != PTL_OK) {
 464                 CERROR("PtlMDAttach failed: %d\n", rc);
 465                 LASSERT (rc == PTL_NO_SPACE);
 466                 GOTO(cleanup_me, rc -ENOMEM);
 467         }
 468
 469         CDEBUG(D_NET, "Setup reply buffer: %u bytes, xid "LPU64
 470                ", portal %u on %s\n",
 471                request->rq_replen, request->rq_xid,
 472                request->rq_reply_portal,
 473                connection->c_peer.peer_ni->pni_name);
 474
 475         ptlrpc_request_addref(request);        /* +1 ref for the SENT callback */
 476
 477         request->rq_sent = LTIME_S(CURRENT_TIME);
 478         ptlrpc_pinger_sending_on_import(request->rq_import);
 479         rc = ptl_send_buf(&request->rq_req_md_h,
 480                           request->rq_reqmsg, request->rq_reqlen,
 481                           PTL_NOACK_REQ, &request->rq_req_cbid,
 482                           connection,
 483                           request->rq_request_portal,
 484                           request->rq_xid);
 485         if (rc == 0) {
 486                 ptlrpc_lprocfs_rpc_sent(request);
 487                 RETURN(rc);
 488         }
 489
 490         ptlrpc_req_finished (request);          /* drop callback ref */
 491
 492  cleanup_me:
 493         /* MEUnlink is safe; the PUT didn't even get off the ground, and
 494          * nobody apart from the PUT's target has the right nid+XID to
 495          * access the reply buffer. */
 496         rc2 = PtlMEUnlink(reply_me_h);
 497         LASSERT (rc2 == PTL_OK);
 498         /* UNLINKED callback called synchronously */
 499         LASSERT (!request->rq_receiving_reply);
 500
 501  cleanup_repmsg:
 502         OBD_FREE(request->rq_repmsg, request->rq_replen);
 503         request->rq_repmsg = NULL;
 504
 505  cleanup_bulk:
 506         if (request->rq_bulk != NULL)
 507                 ptlrpc_unregister_bulk(request);
 508
 509         return rc;
 510 }
 511
 512 int ptlrpc_register_rqbd (struct ptlrpc_request_buffer_desc *rqbd)
 513 {
 514         struct ptlrpc_srv_ni    *srv_ni = rqbd->rqbd_srv_ni;
 515         struct ptlrpc_service   *service = srv_ni->sni_service;
 516         static ptl_process_id_t  match_id = {PTL_NID_ANY, PTL_PID_ANY};
 517         int                      rc;
 518         ptl_md_t                 md;
 519         ptl_handle_me_t          me_h;
 520
 521         CDEBUG(D_NET, "PtlMEAttach: portal %d on %s\n",
 522                service->srv_req_portal, srv_ni->sni_ni->pni_name);
 523
 524         if (OBD_FAIL_CHECK_ONCE(OBD_FAIL_PTLRPC_RQBD))
 525                 return (-ENOMEM);
 526
 527         rc = PtlMEAttach(srv_ni->sni_ni->pni_ni_h, service->srv_req_portal,
 528                          match_id, 0, ~0, PTL_UNLINK, PTL_INS_AFTER, &me_h);
 529         if (rc != PTL_OK) {
 530                 CERROR("PtlMEAttach failed: %d\n", rc);
 531                 return (-ENOMEM);
 532         }
 533
 534         LASSERT(rqbd->rqbd_refcount == 0);
 535         rqbd->rqbd_refcount = 1;
 536
 537         md.start     = rqbd->rqbd_buffer;
 538         md.length    = service->srv_buf_size;
 539         md.max_size  = service->srv_max_req_size;
 540         md.threshold = PTL_MD_THRESH_INF;
 541         md.options   = PTLRPC_MD_OPTIONS | PTL_MD_OP_PUT | PTL_MD_MAX_SIZE;
 542         md.user_ptr  = &rqbd->rqbd_cbid;
 543         md.eventq    = srv_ni->sni_ni->pni_eq_h;
 544
 545         rc = PtlMDAttach(me_h, md, PTL_UNLINK, &rqbd->rqbd_md_h);
 546         if (rc == PTL_OK)
 547                 return (0);
 548
 549         CERROR("PtlMDAttach failed: %d; \n", rc);
 550         LASSERT (rc == PTL_NO_SPACE);
 551         rc = PtlMEUnlink (me_h);
 552         LASSERT (rc == PTL_OK);
 553         rqbd->rqbd_refcount = 0;
 554
 555         return (-ENOMEM);
 556 }