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, 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 <errno.h>
  26 #include <signal.h>
  27 #include <liblustre.h>
  28 #endif
  29
  30 #include <linux/obd_support.h>
  31 #include <linux/obd_class.h>
  32 #include <linux/lustre_lib.h>
  33 #include <linux/lustre_ha.h>
  34 #include <linux/lustre_import.h>
  35
  36 #include "ptlrpc_internal.h"
  37
  38 void ptlrpc_init_client(int req_portal, int rep_portal, char *name,
  39                         struct ptlrpc_client *cl)
  40 {
  41         cl->cli_request_portal = req_portal;
  42         cl->cli_reply_portal   = rep_portal;
  43         cl->cli_name           = name;
  44 }
  45
  46 struct obd_uuid *ptlrpc_req_to_uuid(struct ptlrpc_request *req)
  47 {
  48         return &req->rq_connection->c_remote_uuid;
  49 }
  50
  51 struct ptlrpc_connection *ptlrpc_uuid_to_connection(struct obd_uuid *uuid)
  52 {
  53         struct ptlrpc_connection *c;
  54         struct ptlrpc_peer peer;
  55         int err;
  56
  57         err = ptlrpc_uuid_to_peer(uuid, &peer);
  58         if (err != 0) {
  59                 CERROR("cannot find peer %s!\n", uuid->uuid);
  60                 return NULL;
  61         }
  62
  63         c = ptlrpc_get_connection(&peer, uuid);
  64         if (c) {
  65                 memcpy(c->c_remote_uuid.uuid,
  66                        uuid->uuid, sizeof(c->c_remote_uuid.uuid));
  67         }
  68
  69         CDEBUG(D_INFO, "%s -> %p\n", uuid->uuid, c);
  70
  71         return c;
  72 }
  73
  74 void ptlrpc_readdress_connection(struct ptlrpc_connection *conn,
  75                                  struct obd_uuid *uuid)
  76 {
  77         struct ptlrpc_peer peer;
  78         int err;
  79
  80         err = ptlrpc_uuid_to_peer(uuid, &peer);
  81         if (err != 0) {
  82                 CERROR("cannot find peer %s!\n", uuid->uuid);
  83                 return;
  84         }
  85
  86         memcpy(&conn->c_peer, &peer, sizeof (peer));
  87         return;
  88 }
  89
  90 static inline struct ptlrpc_bulk_desc *new_bulk(void)
  91 {
  92         struct ptlrpc_bulk_desc *desc;
  93
  94         OBD_ALLOC(desc, sizeof(*desc));
  95         if (!desc)
  96                 return NULL;
  97
  98         spin_lock_init(&desc->bd_lock);
  99         init_waitqueue_head(&desc->bd_waitq);
 100         INIT_LIST_HEAD(&desc->bd_page_list);
 101         desc->bd_md_h = PTL_HANDLE_NONE;
 102         desc->bd_me_h = PTL_HANDLE_NONE;
 103
 104         return desc;
 105 }
 106
 107 struct ptlrpc_bulk_desc *ptlrpc_prep_bulk_imp (struct ptlrpc_request *req,
 108                                                int type, int portal)
 109 {
 110         struct obd_import *imp = req->rq_import;
 111         struct ptlrpc_bulk_desc *desc;
 112
 113         LASSERT(type == BULK_PUT_SINK || type == BULK_GET_SOURCE);
 114
 115         desc = new_bulk();
 116         if (desc == NULL)
 117                 RETURN(NULL);
 118
 119         desc->bd_import_generation = req->rq_import_generation;
 120         desc->bd_import = class_import_get(imp);
 121         desc->bd_req = req;
 122         desc->bd_type = type;
 123         desc->bd_portal = portal;
 124
 125         /* This makes req own desc, and free it when she frees herself */
 126         req->rq_bulk = desc;
 127
 128         return desc;
 129 }
 130
 131 struct ptlrpc_bulk_desc *ptlrpc_prep_bulk_exp (struct ptlrpc_request *req,
 132                                                int type, int portal)
 133 {
 134         struct obd_export *exp = req->rq_export;
 135         struct ptlrpc_bulk_desc *desc;
 136
 137         LASSERT(type == BULK_PUT_SOURCE || type == BULK_GET_SINK);
 138
 139         desc = new_bulk();
 140         if (desc == NULL)
 141                 RETURN(NULL);
 142
 143         desc->bd_export = class_export_get(exp);
 144         desc->bd_req = req;
 145         desc->bd_type = type;
 146         desc->bd_portal = portal;
 147
 148         /* NB we don't assign rq_bulk here; server-side requests are
 149          * re-used, and the handler frees the bulk desc explicitly. */
 150
 151         return desc;
 152 }
 153
 154 int ptlrpc_prep_bulk_page(struct ptlrpc_bulk_desc *desc,
 155                           struct page *page, int pageoffset, int len)
 156 {
 157         struct ptlrpc_bulk_page *bulk;
 158
 159         OBD_ALLOC(bulk, sizeof(*bulk));
 160         if (bulk == NULL)
 161                 return -ENOMEM;
 162
 163         LASSERT(page != NULL);
 164         LASSERT(pageoffset >= 0);
 165         LASSERT(len > 0);
 166         LASSERT(pageoffset + len <= PAGE_SIZE);
 167
 168         bulk->bp_page = page;
 169         bulk->bp_pageoffset = pageoffset;
 170         bulk->bp_buflen = len;
 171
 172         bulk->bp_desc = desc;
 173         list_add_tail(&bulk->bp_link, &desc->bd_page_list);
 174         desc->bd_page_count++;
 175         return 0;
 176 }
 177
 178 void ptlrpc_free_bulk(struct ptlrpc_bulk_desc *desc)
 179 {
 180         struct list_head *tmp, *next;
 181         ENTRY;
 182
 183         LASSERT(desc != NULL);
 184         LASSERT(desc->bd_page_count != 0x5a5a5a5a); /* not freed already */
 185         LASSERT(!desc->bd_network_rw);         /* network hands off or */
 186
 187         list_for_each_safe(tmp, next, &desc->bd_page_list) {
 188                 struct ptlrpc_bulk_page *bulk;
 189                 bulk = list_entry(tmp, struct ptlrpc_bulk_page, bp_link);
 190                 ptlrpc_free_bulk_page(bulk);
 191         }
 192
 193         LASSERT(desc->bd_page_count == 0);
 194         LASSERT((desc->bd_export != NULL) ^ (desc->bd_import != NULL));
 195
 196         if (desc->bd_export)
 197                 class_export_put(desc->bd_export);
 198         else
 199                 class_import_put(desc->bd_import);
 200
 201         OBD_FREE(desc, sizeof(*desc));
 202         EXIT;
 203 }
 204
 205 void ptlrpc_free_bulk_page(struct ptlrpc_bulk_page *bulk)
 206 {
 207         LASSERT(bulk != NULL);
 208
 209         list_del(&bulk->bp_link);
 210         bulk->bp_desc->bd_page_count--;
 211         OBD_FREE(bulk, sizeof(*bulk));
 212 }
 213
 214 struct ptlrpc_request *ptlrpc_prep_req(struct obd_import *imp, int opcode,
 215                                        int count, int *lengths, char **bufs)
 216 {
 217         struct ptlrpc_request *request;
 218         int rc;
 219         ENTRY;
 220
 221         LASSERT((unsigned long)imp > 0x1000);
 222
 223         OBD_ALLOC(request, sizeof(*request));
 224         if (!request) {
 225                 CERROR("request allocation out of memory\n");
 226                 RETURN(NULL);
 227         }
 228
 229         rc = lustre_pack_request(request, count, lengths, bufs);
 230         if (rc) {
 231                 CERROR("cannot pack request %d\n", rc);
 232                 OBD_FREE(request, sizeof(*request));
 233                 RETURN(NULL);
 234         }
 235
 236         if (imp->imp_server_timeout)
 237                 request->rq_timeout = obd_timeout / 2;
 238         else
 239                 request->rq_timeout = obd_timeout;
 240         request->rq_send_state = LUSTRE_IMP_FULL;
 241         request->rq_type = PTL_RPC_MSG_REQUEST;
 242         request->rq_import = class_import_get(imp);
 243         request->rq_phase = RQ_PHASE_NEW;
 244
 245         /* XXX FIXME bug 249 */
 246         request->rq_request_portal = imp->imp_client->cli_request_portal;
 247         request->rq_reply_portal = imp->imp_client->cli_reply_portal;
 248
 249         request->rq_connection = ptlrpc_connection_addref(imp->imp_connection);
 250
 251         spin_lock_init(&request->rq_lock);
 252         INIT_LIST_HEAD(&request->rq_list);
 253         init_waitqueue_head(&request->rq_reply_waitq);
 254         request->rq_xid = ptlrpc_next_xid();
 255         atomic_set(&request->rq_refcount, 1);
 256
 257         request->rq_reqmsg->opc = opcode;
 258         request->rq_reqmsg->flags = 0;
 259
 260         RETURN(request);
 261 }
 262
 263 struct ptlrpc_request_set *ptlrpc_prep_set(void)
 264 {
 265         struct ptlrpc_request_set *set;
 266
 267         OBD_ALLOC(set, sizeof *set);
 268         if (!set)
 269                 RETURN(NULL);
 270         INIT_LIST_HEAD(&set->set_requests);
 271         init_waitqueue_head(&set->set_waitq);
 272         set->set_remaining = 0;
 273         spin_lock_init(&set->set_new_req_lock);
 274         INIT_LIST_HEAD(&set->set_new_requests);
 275
 276         RETURN(set);
 277 }
 278
 279 /* Finish with this set; opposite of prep_set. */
 280 void ptlrpc_set_destroy(struct ptlrpc_request_set *set)
 281 {
 282         struct list_head *tmp;
 283         struct list_head *next;
 284         int               expected_phase;
 285         int               n = 0;
 286         ENTRY;
 287
 288         /* Requests on the set should either all be completed, or all be new */
 289         expected_phase = (set->set_remaining == 0) ?
 290                          RQ_PHASE_COMPLETE : RQ_PHASE_NEW;
 291         list_for_each (tmp, &set->set_requests) {
 292                 struct ptlrpc_request *req =
 293                         list_entry(tmp, struct ptlrpc_request, rq_set_chain);
 294
 295                 LASSERT(req->rq_phase == expected_phase);
 296                 n++;
 297         }
 298
 299         LASSERT(set->set_remaining == 0 || set->set_remaining == n);
 300
 301         list_for_each_safe(tmp, next, &set->set_requests) {
 302                 struct ptlrpc_request *req =
 303                         list_entry(tmp, struct ptlrpc_request, rq_set_chain);
 304                 list_del_init(&req->rq_set_chain);
 305
 306                 LASSERT(req->rq_phase == expected_phase);
 307
 308                 if (req->rq_phase == RQ_PHASE_NEW) {
 309
 310                         if (req->rq_interpret_reply != NULL) {
 311                                 int (*interpreter)(struct ptlrpc_request *,
 312                                                    void *, int) =
 313                                         req->rq_interpret_reply;
 314
 315                                 /* higher level (i.e. LOV) failed;
 316                                  * let the sub reqs clean up */
 317                                 req->rq_status = -EBADR;
 318                                 interpreter(req, &req->rq_async_args,
 319                                             req->rq_status);
 320                         }
 321                         set->set_remaining--;
 322                 }
 323
 324                 req->rq_set = NULL;
 325                 ptlrpc_req_finished (req);
 326         }
 327
 328         LASSERT(set->set_remaining == 0);
 329
 330         OBD_FREE(set, sizeof(*set));
 331         EXIT;
 332 }
 333
 334 void ptlrpc_set_add_req(struct ptlrpc_request_set *set,
 335                         struct ptlrpc_request *req)
 336 {
 337         /* The set takes over the caller's request reference */
 338         list_add_tail(&req->rq_set_chain, &set->set_requests);
 339         req->rq_set = set;
 340         set->set_remaining++;
 341 }
 342
 343 /* lock so many callers can add things, the context that owns the set
 344  * is supposed to notice these and move them into the set proper. */
 345 void ptlrpc_set_add_new_req(struct ptlrpc_request_set *set,
 346                             struct ptlrpc_request *req)
 347 {
 348         unsigned long flags;
 349         spin_lock_irqsave(&set->set_new_req_lock, flags);
 350         /* The set takes over the caller's request reference */
 351         list_add_tail(&req->rq_set_chain, &set->set_new_requests);
 352         req->rq_set = set;
 353         spin_unlock_irqrestore(&set->set_new_req_lock, flags);
 354 }
 355
 356 /*
 357  * Based on the current state of the import, determine if the request
 358  * can be sent, is an error, or should be delayed.
 359  *
 360  * Returns true if this request should be delayed. If false, and
 361  * *status is set, then the request can not be sent and *status is the
 362  * error code.  If false and status is 0, then request can be sent.
 363  *
 364  * The imp->imp_lock must be held.
 365  */
 366 static int ptlrpc_import_delay_req(struct obd_import *imp,
 367                                    struct ptlrpc_request *req, int *status)
 368 {
 369         int delay = 0;
 370         ENTRY;
 371
 372         LASSERT (status != NULL);
 373         *status = 0;
 374
 375         /* A new import, or one that has been cleaned up.
 376          */
 377         if (imp->imp_state == LUSTRE_IMP_NEW) {
 378                 DEBUG_REQ(D_ERROR, req, "Uninitialized import.");
 379                 *status = -EIO;
 380         }
 381         /*
 382          * If the import has been invalidated (such as by an OST failure), the
 383          * request must fail with -EIO.
 384          */
 385         else if (imp->imp_invalid) {
 386                 DEBUG_REQ(D_ERROR, req, "IMP_INVALID");
 387                 *status = -EIO;
 388         }
 389         else if (req->rq_import_generation != imp->imp_generation) {
 390                 DEBUG_REQ(D_ERROR, req, "req wrong generation:");
 391                 *status = -EIO;
 392         }
 393         else if (req->rq_send_state != imp->imp_state) {
 394                 if (imp->imp_obd->obd_no_recov || imp->imp_dlm_fake)
 395                         *status = -EWOULDBLOCK;
 396                 else
 397                         delay = 1;
 398         }
 399
 400         RETURN(delay);
 401 }
 402
 403 static int ptlrpc_check_reply(struct ptlrpc_request *req)
 404 {
 405         unsigned long flags;
 406         int rc = 0;
 407         ENTRY;
 408
 409         /* serialise with network callback */
 410         spin_lock_irqsave (&req->rq_lock, flags);
 411
 412         if (req->rq_replied) {
 413                 DEBUG_REQ(D_NET, req, "REPLIED:");
 414                 GOTO(out, rc = 1);
 415         }
 416
 417         if (req->rq_err) {
 418                 DEBUG_REQ(D_ERROR, req, "ABORTED:");
 419                 GOTO(out, rc = 1);
 420         }
 421
 422         if (req->rq_resend) {
 423                 DEBUG_REQ(D_ERROR, req, "RESEND:");
 424                 GOTO(out, rc = 1);
 425         }
 426
 427         if (req->rq_restart) {
 428                 DEBUG_REQ(D_ERROR, req, "RESTART:");
 429                 GOTO(out, rc = 1);
 430         }
 431         EXIT;
 432  out:
 433         spin_unlock_irqrestore (&req->rq_lock, flags);
 434         DEBUG_REQ(D_NET, req, "rc = %d for", rc);
 435         return rc;
 436 }
 437
 438 static int ptlrpc_check_status(struct ptlrpc_request *req)
 439 {
 440         int err;
 441         ENTRY;
 442
 443         err = req->rq_repmsg->status;
 444         if (req->rq_repmsg->type == PTL_RPC_MSG_ERR) {
 445                 DEBUG_REQ(D_ERROR, req, "type == PTL_RPC_MSG_ERR");
 446                 RETURN(err < 0 ? err : -EINVAL);
 447         }
 448
 449         if (err < 0) {
 450                 DEBUG_REQ(D_INFO, req, "status is %d", err);
 451         } else if (err > 0) {
 452                 /* XXX: translate this error from net to host */
 453                 DEBUG_REQ(D_INFO, req, "status is %d", err);
 454         }
 455
 456         RETURN(err);
 457 }
 458
 459 static int after_reply(struct ptlrpc_request *req, int *restartp)
 460 {
 461         unsigned long flags;
 462         struct obd_import *imp = req->rq_import;
 463         int rc;
 464         ENTRY;
 465
 466         LASSERT(!req->rq_receiving_reply);
 467         LASSERT(req->rq_replied);
 468
 469         if (restartp != NULL)
 470                 *restartp = 0;
 471
 472         /* NB Until this point, the whole of the incoming message,
 473          * including buflens, status etc is in the sender's byte order. */
 474
 475 #if SWAB_PARANOIA
 476         /* Clear reply swab mask; this is a new reply in sender's byte order */
 477         req->rq_rep_swab_mask = 0;
 478 #endif
 479         rc = lustre_unpack_msg(req->rq_repmsg, req->rq_replen);
 480         if (rc) {
 481                 CERROR("unpack_rep failed: %d\n", rc);
 482                 RETURN(-EPROTO);
 483         }
 484
 485         if (req->rq_repmsg->type != PTL_RPC_MSG_REPLY &&
 486             req->rq_repmsg->type != PTL_RPC_MSG_ERR) {
 487                 CERROR("invalid packet type received (type=%u)\n",
 488                        req->rq_repmsg->type);
 489                 RETURN(-EPROTO);
 490         }
 491
 492         /* Store transno in reqmsg for replay. */
 493         req->rq_reqmsg->transno = req->rq_transno = req->rq_repmsg->transno;
 494
 495         rc = ptlrpc_check_status(req);
 496
 497         /* Either we've been evicted, or the server has failed for
 498          * some reason. Try to reconnect, and if that fails, punt to the
 499          * upcall. */
 500         if (rc == -ENOTCONN) {
 501                 if (req->rq_send_state != LUSTRE_IMP_FULL ||
 502                     imp->imp_obd->obd_no_recov || imp->imp_dlm_fake) {
 503                         RETURN(-ENOTCONN);
 504                 }
 505
 506                 ptlrpc_request_handle_notconn(req);
 507
 508                 if (req->rq_err)
 509                         RETURN(-EIO);
 510
 511                 if (req->rq_no_resend)
 512                         RETURN(rc); /* -ENOTCONN */
 513
 514                 if (req->rq_resend) {
 515                         if (restartp == NULL)
 516                                 LBUG(); /* async resend not supported yet */
 517                         spin_lock_irqsave (&req->rq_lock, flags);
 518                         req->rq_resend = 0;
 519                         spin_unlock_irqrestore (&req->rq_lock, flags);
 520                         *restartp = 1;
 521                         lustre_msg_add_flags(req->rq_reqmsg, MSG_RESENT);
 522                         DEBUG_REQ(D_HA, req, "resending: ");
 523                         RETURN(0);
 524                 }
 525
 526                 CERROR("request should be err or resend: %p\n", req);
 527                 LBUG();
 528         }
 529
 530         if (req->rq_import->imp_replayable) {
 531                 spin_lock_irqsave(&imp->imp_lock, flags);
 532                 if (req->rq_replay || req->rq_transno != 0)
 533                         ptlrpc_retain_replayable_request(req, imp);
 534                 else if (req->rq_commit_cb != NULL)
 535                         req->rq_commit_cb(req);
 536
 537                 if (req->rq_transno > imp->imp_max_transno)
 538                         imp->imp_max_transno = req->rq_transno;
 539
 540                 /* Replay-enabled imports return commit-status information. */
 541                 if (req->rq_repmsg->last_committed)
 542                         imp->imp_peer_committed_transno =
 543                                 req->rq_repmsg->last_committed;
 544                 ptlrpc_free_committed(imp);
 545                 spin_unlock_irqrestore(&imp->imp_lock, flags);
 546         }
 547
 548         RETURN(rc);
 549 }
 550
 551 static int ptlrpc_send_new_req(struct ptlrpc_request *req)
 552 {
 553         struct obd_import     *imp;
 554         unsigned long          flags;
 555         int rc;
 556         ENTRY;
 557
 558         LASSERT(req->rq_send_state == LUSTRE_IMP_FULL);
 559         LASSERT(req->rq_phase == RQ_PHASE_NEW);
 560         req->rq_phase = RQ_PHASE_RPC;
 561
 562         imp = req->rq_import;
 563         spin_lock_irqsave(&imp->imp_lock, flags);
 564
 565         if (imp->imp_invalid) {
 566                 spin_unlock_irqrestore(&imp->imp_lock, flags);
 567                 req->rq_status = -EIO;
 568                 req->rq_phase = RQ_PHASE_INTERPRET;
 569                 RETURN(-EIO);
 570         }
 571
 572         req->rq_import_generation = imp->imp_generation;
 573
 574         if (ptlrpc_import_delay_req(imp, req, &rc)) {
 575                 spin_lock (&req->rq_lock);
 576                 req->rq_waiting = 1;
 577                 spin_unlock (&req->rq_lock);
 578
 579                 LASSERT(list_empty (&req->rq_list));
 580
 581                 // list_del(&req->rq_list);
 582                 list_add_tail(&req->rq_list, &imp->imp_delayed_list);
 583                 spin_unlock_irqrestore(&imp->imp_lock, flags);
 584                 RETURN(0);
 585         }
 586
 587         if (rc != 0) {
 588                 spin_unlock_irqrestore(&imp->imp_lock, flags);
 589                 req->rq_status = rc;
 590                 req->rq_phase = RQ_PHASE_INTERPRET;
 591                 RETURN(rc);
 592         }
 593
 594         /* XXX this is the same as ptlrpc_queue_wait */
 595         LASSERT(list_empty(&req->rq_list));
 596         list_add_tail(&req->rq_list, &imp->imp_sending_list);
 597         spin_unlock_irqrestore(&imp->imp_lock, flags);
 598
 599         req->rq_reqmsg->status = current->pid;
 600         CDEBUG(D_RPCTRACE, "Sending RPC pname:cluuid:pid:xid:ni:nid:opc"
 601                " %s:%s:%d:"LPU64":%s:"LPX64":%d\n", current->comm,
 602                imp->imp_obd->obd_uuid.uuid, req->rq_reqmsg->status,
 603                req->rq_xid,
 604                imp->imp_connection->c_peer.peer_ni->pni_name,
 605                imp->imp_connection->c_peer.peer_nid,
 606                req->rq_reqmsg->opc);
 607
 608         rc = ptl_send_rpc(req);
 609         if (rc) {
 610                 DEBUG_REQ(D_HA, req, "send failed (%d); expect timeout", rc);
 611                 req->rq_timeout = 1;
 612                 RETURN(rc);
 613         }
 614         RETURN(0);
 615 }
 616
 617 int ptlrpc_check_set(struct ptlrpc_request_set *set)
 618 {
 619         unsigned long flags;
 620         struct list_head *tmp;
 621         int force_timer_recalc = 0;
 622         ENTRY;
 623
 624         if (set->set_remaining == 0)
 625                 RETURN(1);
 626
 627         list_for_each(tmp, &set->set_requests) {
 628                 struct ptlrpc_request *req =
 629                         list_entry(tmp, struct ptlrpc_request, rq_set_chain);
 630                 struct obd_import *imp = req->rq_import;
 631                 int rc = 0;
 632
 633                 if (req->rq_phase == RQ_PHASE_NEW &&
 634                     ptlrpc_send_new_req(req)) {
 635                         force_timer_recalc = 1;
 636                 }
 637
 638                 if (!(req->rq_phase == RQ_PHASE_RPC ||
 639                       req->rq_phase == RQ_PHASE_BULK ||
 640                       req->rq_phase == RQ_PHASE_INTERPRET ||
 641                       req->rq_phase == RQ_PHASE_COMPLETE)) {
 642                         DEBUG_REQ(D_ERROR, req, "bad phase %x", req->rq_phase);
 643                         LBUG();
 644                 }
 645
 646                 if (req->rq_phase == RQ_PHASE_COMPLETE)
 647                         continue;
 648
 649                 if (req->rq_phase == RQ_PHASE_INTERPRET)
 650                         GOTO(interpret, req->rq_status);
 651
 652                 if (req->rq_err) {
 653                         ptlrpc_unregister_reply(req);
 654                         if (req->rq_status == 0)
 655                                 req->rq_status = -EIO;
 656                         req->rq_phase = RQ_PHASE_INTERPRET;
 657
 658                         spin_lock_irqsave(&imp->imp_lock, flags);
 659                         list_del_init(&req->rq_list);
 660                         spin_unlock_irqrestore(&imp->imp_lock, flags);
 661
 662                         GOTO(interpret, req->rq_status);
 663                 }
 664
 665                 if (req->rq_intr) {
 666                         /* NB could be on delayed list */
 667                         ptlrpc_unregister_reply(req);
 668                         req->rq_status = -EINTR;
 669                         req->rq_phase = RQ_PHASE_INTERPRET;
 670
 671                         spin_lock_irqsave(&imp->imp_lock, flags);
 672                         list_del_init(&req->rq_list);
 673                         spin_unlock_irqrestore(&imp->imp_lock, flags);
 674
 675                         GOTO(interpret, req->rq_status);
 676                 }
 677
 678                 if (req->rq_phase == RQ_PHASE_RPC) {
 679                         int do_restart = 0;
 680                         if (req->rq_waiting || req->rq_resend) {
 681                                 int status;
 682                                 spin_lock_irqsave(&imp->imp_lock, flags);
 683
 684                                 if (ptlrpc_import_delay_req(imp, req, &status)) {
 685                                         spin_unlock_irqrestore(&imp->imp_lock,
 686                                                                flags);
 687                                         continue;
 688                                 }
 689
 690                                 list_del(&req->rq_list);
 691                                 list_add_tail(&req->rq_list,
 692                                               &imp->imp_sending_list);
 693
 694                                 if (status != 0)  {
 695                                         req->rq_status = status;
 696                                         req->rq_phase = RQ_PHASE_INTERPRET;
 697                                         spin_unlock_irqrestore(&imp->imp_lock,
 698                                                                flags);
 699                                         GOTO(interpret, req->rq_status);
 700                                 }
 701                                 spin_unlock_irqrestore(&imp->imp_lock, flags);
 702
 703                                 req->rq_waiting = 0;
 704                                 if (req->rq_resend) {
 705                                         lustre_msg_add_flags(req->rq_reqmsg,
 706                                                              MSG_RESENT);
 707                                         spin_lock_irqsave(&req->rq_lock, flags);
 708                                         req->rq_resend = 0;
 709                                         spin_unlock_irqrestore(&req->rq_lock,
 710                                                                flags);
 711
 712                                         ptlrpc_unregister_reply(req);
 713                                         if (req->rq_bulk) {
 714                                                 __u64 old_xid = req->rq_xid;
 715                                                 ptlrpc_unregister_bulk(req);
 716                                                 /* ensure previous bulk fails */
 717                                                 req->rq_xid = ptlrpc_next_xid();
 718                                                 CDEBUG(D_HA, "resend bulk "
 719                                                        "old x"LPU64
 720                                                        " new x"LPU64"\n",
 721                                                        old_xid, req->rq_xid);
 722                                         }
 723                                 }
 724
 725                                 rc = ptl_send_rpc(req);
 726                                 if (rc) {
 727                                         DEBUG_REQ(D_HA, req, "send failed (%d)",
 728                                                   rc);
 729                                         force_timer_recalc = 1;
 730                                         req->rq_timeout = 0;
 731                                 }
 732                                 /* need to reset the timeout */
 733                                 force_timer_recalc = 1;
 734                         }
 735
 736                         /* Ensure the network callback returned */
 737                         spin_lock_irqsave (&req->rq_lock, flags);
 738                         if (!req->rq_replied) {
 739                                 spin_unlock_irqrestore (&req->rq_lock, flags);
 740                                 continue;
 741                         }
 742                         spin_unlock_irqrestore (&req->rq_lock, flags);
 743
 744                         spin_lock_irqsave(&imp->imp_lock, flags);
 745                         list_del_init(&req->rq_list);
 746                         spin_unlock_irqrestore(&imp->imp_lock, flags);
 747
 748                         req->rq_status = after_reply(req, &do_restart);
 749                         if (do_restart) {
 750                                 spin_lock_irqsave (&req->rq_lock, flags);
 751                                 req->rq_resend = 1; /* ugh */
 752                                 spin_unlock_irqrestore (&req->rq_lock, flags);
 753                                 continue;
 754                         }
 755
 756                         /* If there is no bulk associated with this request,
 757                          * then we're done and should let the interpreter
 758                          * process the reply.  Similarly if the RPC returned
 759                          * an error, and therefore the bulk will never arrive.
 760                          */
 761                         if (req->rq_bulk == NULL || req->rq_status != 0) {
 762                                 req->rq_phase = RQ_PHASE_INTERPRET;
 763                                 GOTO(interpret, req->rq_status);
 764                         }
 765
 766                         req->rq_phase = RQ_PHASE_BULK;
 767                 }
 768
 769                 LASSERT(req->rq_phase == RQ_PHASE_BULK);
 770                 if (!ptlrpc_bulk_complete (req->rq_bulk))
 771                         continue;
 772
 773                 req->rq_phase = RQ_PHASE_INTERPRET;
 774
 775         interpret:
 776                 LASSERT(req->rq_phase == RQ_PHASE_INTERPRET);
 777                 LASSERT(!req->rq_receiving_reply);
 778
 779                 ptlrpc_unregister_reply(req);
 780                 if (req->rq_bulk != NULL)
 781                         ptlrpc_unregister_bulk (req);
 782
 783                 if (req->rq_interpret_reply != NULL) {
 784                         int (*interpreter)(struct ptlrpc_request *,void *,int) =
 785                                 req->rq_interpret_reply;
 786                         req->rq_status = interpreter(req, &req->rq_async_args,
 787                                                      req->rq_status);
 788                 }
 789
 790                 CDEBUG(D_RPCTRACE, "Completed RPC pname:cluuid:pid:xid:ni:nid:"
 791                        "opc %s:%s:%d:"LPU64":%s:"LPX64":%d\n", current->comm,
 792                        imp->imp_obd->obd_uuid.uuid, req->rq_reqmsg->status,
 793                        req->rq_xid,
 794                        imp->imp_connection->c_peer.peer_ni->pni_name,
 795                        imp->imp_connection->c_peer.peer_nid,
 796                        req->rq_reqmsg->opc);
 797
 798                 req->rq_phase = RQ_PHASE_COMPLETE;
 799                 set->set_remaining--;
 800         }
 801
 802         /* If we hit an error, we want to recover promptly. */
 803         RETURN(set->set_remaining == 0 || force_timer_recalc);
 804 }
 805
 806 int ptlrpc_expire_one_request(struct ptlrpc_request *req)
 807 {
 808         unsigned long      flags;
 809         struct obd_import *imp = req->rq_import;
 810         ENTRY;
 811
 812         DEBUG_REQ(D_ERROR, req, "timeout");
 813
 814         spin_lock_irqsave (&req->rq_lock, flags);
 815         req->rq_timedout = 1;
 816         spin_unlock_irqrestore (&req->rq_lock, flags);
 817
 818         ptlrpc_unregister_reply (req);
 819
 820         if (imp == NULL) {
 821                 DEBUG_REQ(D_HA, req, "NULL import: already cleaned up?");
 822                 RETURN(1);
 823         }
 824
 825         /* The DLM server doesn't want recovery run on its imports. */
 826         if (imp->imp_dlm_fake)
 827                 RETURN(1);
 828
 829         /* If this request is for recovery or other primordial tasks,
 830          * don't go back to sleep, and don't start recovery again.. */
 831         if (req->rq_send_state != LUSTRE_IMP_FULL || imp->imp_obd->obd_no_recov)
 832                 RETURN(1);
 833
 834         ptlrpc_fail_import(imp, req->rq_import_generation);
 835
 836         RETURN(0);
 837 }
 838
 839 int ptlrpc_expired_set(void *data)
 840 {
 841         struct ptlrpc_request_set *set = data;
 842         struct list_head          *tmp;
 843         time_t                     now = LTIME_S (CURRENT_TIME);
 844         ENTRY;
 845
 846         LASSERT(set != NULL);
 847
 848         /* A timeout expired; see which reqs it applies to... */
 849         list_for_each (tmp, &set->set_requests) {
 850                 struct ptlrpc_request *req =
 851                         list_entry(tmp, struct ptlrpc_request, rq_set_chain);
 852
 853                 /* request in-flight? */
 854                 if (!((req->rq_phase == RQ_PHASE_RPC && !req->rq_waiting) ||
 855                       (req->rq_phase == RQ_PHASE_BULK)))
 856                         continue;
 857
 858                 if (req->rq_timedout ||           /* already dealt with */
 859                     req->rq_sent + req->rq_timeout > now) /* not expired */
 860                         continue;
 861
 862                 /* deal with this guy */
 863                 ptlrpc_expire_one_request (req);
 864         }
 865
 866         /* When waiting for a whole set, we always to break out of the
 867          * sleep so we can recalculate the timeout, or enable interrupts
 868          * iff everyone's timed out.
 869          */
 870         RETURN(1);
 871 }
 872
 873 void ptlrpc_interrupted_set(void *data)
 874 {
 875         struct ptlrpc_request_set *set = data;
 876         struct list_head *tmp;
 877         unsigned long flags;
 878
 879         LASSERT(set != NULL);
 880         CERROR("INTERRUPTED SET %p\n", set);
 881
 882         list_for_each(tmp, &set->set_requests) {
 883                 struct ptlrpc_request *req =
 884                         list_entry(tmp, struct ptlrpc_request, rq_set_chain);
 885
 886                 if (req->rq_phase != RQ_PHASE_RPC)
 887                         continue;
 888
 889                 spin_lock_irqsave (&req->rq_lock, flags);
 890                 req->rq_intr = 1;
 891                 spin_unlock_irqrestore (&req->rq_lock, flags);
 892         }
 893 }
 894
 895 int ptlrpc_set_next_timeout(struct ptlrpc_request_set *set)
 896 {
 897         struct list_head      *tmp;
 898         time_t                 now = LTIME_S(CURRENT_TIME);
 899         time_t                 deadline;
 900         int                    timeout = 0;
 901         struct ptlrpc_request *req;
 902         ENTRY;
 903
 904         SIGNAL_MASK_ASSERT(); /* XXX BUG 1511 */
 905
 906         list_for_each(tmp, &set->set_requests) {
 907                 req = list_entry(tmp, struct ptlrpc_request, rq_set_chain);
 908
 909                 /* request in-flight? */
 910                 if (!((req->rq_phase == RQ_PHASE_RPC && !req->rq_waiting) ||
 911                       (req->rq_phase == RQ_PHASE_BULK)))
 912                         continue;
 913
 914                 if (req->rq_timedout)   /* already timed out */
 915                         continue;
 916
 917                 deadline = req->rq_sent + req->rq_timeout;
 918                 if (deadline <= now)    /* actually expired already */
 919                         timeout = 1;    /* ASAP */
 920                 else if (timeout == 0 || timeout > deadline - now)
 921                         timeout = deadline - now;
 922         }
 923         RETURN(timeout);
 924 }
 925
 926
 927 int ptlrpc_set_wait(struct ptlrpc_request_set *set)
 928 {
 929         struct list_head      *tmp;
 930         struct ptlrpc_request *req;
 931         struct l_wait_info     lwi;
 932         int                    rc, timeout;
 933         ENTRY;
 934
 935         LASSERT(!list_empty(&set->set_requests));
 936         list_for_each(tmp, &set->set_requests) {
 937                 req = list_entry(tmp, struct ptlrpc_request, rq_set_chain);
 938                 (void)ptlrpc_send_new_req(req);
 939         }
 940
 941         do {
 942                 timeout = ptlrpc_set_next_timeout(set);
 943
 944                 /* wait until all complete, interrupted, or an in-flight
 945                  * req times out */
 946                 CDEBUG(D_HA, "set %p going to sleep for %d seconds\n",
 947                        set, timeout);
 948                 lwi = LWI_TIMEOUT_INTR((timeout ? timeout : 1) * HZ,
 949                                        ptlrpc_expired_set,
 950                                        ptlrpc_interrupted_set, set);
 951                 rc = l_wait_event(set->set_waitq, ptlrpc_check_set(set), &lwi);
 952
 953                 LASSERT(rc == 0 || rc == -EINTR || rc == -ETIMEDOUT);
 954
 955                 /* -EINTR => all requests have been flagged rq_intr so next
 956                  * check completes.
 957                  * -ETIMEOUTD => someone timed out.  When all reqs have
 958                  * timed out, signals are enabled allowing completion with
 959                  * EINTR.
 960                  * I don't really care if we go once more round the loop in
 961                  * the error cases -eeb. */
 962         } while (rc != 0);
 963
 964         LASSERT(set->set_remaining == 0);
 965
 966         rc = 0;
 967         list_for_each(tmp, &set->set_requests) {
 968                 req = list_entry(tmp, struct ptlrpc_request, rq_set_chain);
 969
 970                 LASSERT(req->rq_phase == RQ_PHASE_COMPLETE);
 971                 if (req->rq_status != 0)
 972                         rc = req->rq_status;
 973         }
 974
 975         if (set->set_interpret != NULL) {
 976                 int (*interpreter)(struct ptlrpc_request_set *set,void *,int) =
 977                         set->set_interpret;
 978                 rc = interpreter (set, &set->set_args, rc);
 979         }
 980
 981         RETURN(rc);
 982 }
 983
 984 static void __ptlrpc_free_req(struct ptlrpc_request *request, int locked)
 985 {
 986         ENTRY;
 987         if (request == NULL) {
 988                 EXIT;
 989                 return;
 990         }
 991
 992         LASSERT(!request->rq_receiving_reply);
 993
 994         /* We must take it off the imp_replay_list first.  Otherwise, we'll set
 995          * request->rq_reqmsg to NULL while osc_close is dereferencing it. */
 996         if (request->rq_import != NULL) {
 997                 unsigned long flags = 0;
 998                 if (!locked)
 999                         spin_lock_irqsave(&request->rq_import->imp_lock, flags);
1000                 list_del_init(&request->rq_list);
1001                 if (!locked)
1002                         spin_unlock_irqrestore(&request->rq_import->imp_lock,
1003                                                flags);
1004         }
1005
1006         if (atomic_read(&request->rq_refcount) != 0) {
1007                 DEBUG_REQ(D_ERROR, request,
1008                           "freeing request with nonzero refcount");
1009                 LBUG();
1010         }
1011
1012         if (request->rq_repmsg != NULL) {
1013                 OBD_FREE(request->rq_repmsg, request->rq_replen);
1014                 request->rq_repmsg = NULL;
1015         }
1016         if (request->rq_reqmsg != NULL) {
1017                 OBD_FREE(request->rq_reqmsg, request->rq_reqlen);
1018                 request->rq_reqmsg = NULL;
1019         }
1020         if (request->rq_export != NULL) {
1021                 class_export_put(request->rq_export);
1022                 request->rq_export = NULL;
1023         }
1024         if (request->rq_import != NULL) {
1025                 class_import_put(request->rq_import);
1026                 request->rq_import = NULL;
1027         }
1028         if (request->rq_bulk != NULL)
1029                 ptlrpc_free_bulk(request->rq_bulk);
1030
1031         ptlrpc_put_connection(request->rq_connection);
1032         OBD_FREE(request, sizeof(*request));
1033         EXIT;
1034 }
1035
1036 void ptlrpc_free_req(struct ptlrpc_request *request)
1037 {
1038         __ptlrpc_free_req(request, 0);
1039 }
1040
1041 static int __ptlrpc_req_finished(struct ptlrpc_request *request, int locked);
1042 void ptlrpc_req_finished_with_imp_lock(struct ptlrpc_request *request)
1043 {
1044 #ifdef CONFIG_SMP
1045         LASSERT(spin_is_locked(&request->rq_import->imp_lock));
1046 #endif
1047         (void)__ptlrpc_req_finished(request, 1);
1048 }
1049
1050 static int __ptlrpc_req_finished(struct ptlrpc_request *request, int locked)
1051 {
1052         ENTRY;
1053         if (request == NULL)
1054                 RETURN(1);
1055
1056         if (request == (void *)(unsigned long)(0x5a5a5a5a5a5a5a5a) ||
1057             request->rq_reqmsg == (void *)(unsigned long)(0x5a5a5a5a5a5a5a5a)) {
1058                 CERROR("dereferencing freed request (bug 575)\n");
1059                 LBUG();
1060                 RETURN(1);
1061         }
1062
1063         DEBUG_REQ(D_INFO, request, "refcount now %u",
1064                   atomic_read(&request->rq_refcount) - 1);
1065
1066         if (atomic_dec_and_test(&request->rq_refcount)) {
1067                 __ptlrpc_free_req(request, locked);
1068                 RETURN(1);
1069         }
1070
1071         RETURN(0);
1072 }
1073
1074 void ptlrpc_req_finished(struct ptlrpc_request *request)
1075 {
1076         __ptlrpc_req_finished(request, 0);
1077 }
1078
1079 static void ptlrpc_cleanup_request_buf(struct ptlrpc_request *request)
1080 {
1081         OBD_FREE(request->rq_reqmsg, request->rq_reqlen);
1082         request->rq_reqmsg = NULL;
1083         request->rq_reqlen = 0;
1084 }
1085
1086 /* Disengage the client's reply buffer from the network
1087  * NB does _NOT_ unregister any client-side bulk.
1088  * IDEMPOTENT, but _not_ safe against concurrent callers.
1089  * The request owner (i.e. the thread doing the I/O) must call...
1090  */
1091 void ptlrpc_unregister_reply (struct ptlrpc_request *request)
1092 {
1093         unsigned long flags;
1094         int           rc;
1095         ENTRY;
1096
1097         LASSERT(!in_interrupt ());             /* might sleep */
1098
1099         spin_lock_irqsave (&request->rq_lock, flags);
1100         if (!request->rq_receiving_reply) {     /* not waiting for a reply */
1101                 spin_unlock_irqrestore (&request->rq_lock, flags);
1102                 EXIT;
1103                 /* NB reply buffer not freed here */
1104                 return;
1105         }
1106
1107         LASSERT(!request->rq_replied);         /* callback hasn't completed */
1108         spin_unlock_irqrestore (&request->rq_lock, flags);
1109
1110         rc = PtlMDUnlink (request->rq_reply_md_h);
1111         switch (rc) {
1112         default:
1113                 LBUG ();
1114
1115         case PTL_OK:                            /* unlinked before completion */
1116                 LASSERT(request->rq_receiving_reply);
1117                 LASSERT(!request->rq_replied);
1118                 spin_lock_irqsave (&request->rq_lock, flags);
1119                 request->rq_receiving_reply = 0;
1120                 spin_unlock_irqrestore (&request->rq_lock, flags);
1121                 OBD_FREE(request->rq_repmsg, request->rq_replen);
1122                 request->rq_repmsg = NULL;
1123                 EXIT;
1124                 return;
1125
1126         case PTL_MD_INUSE:                      /* callback in progress */
1127                 for (;;) {
1128                         /* Network access will complete in finite time but
1129                          * the timeout lets us CERROR for visibility */
1130                         struct l_wait_info lwi = LWI_TIMEOUT(10*HZ, NULL, NULL);
1131
1132                         rc = l_wait_event (request->rq_reply_waitq,
1133                                            request->rq_replied, &lwi);
1134                         LASSERT(rc == 0 || rc == -ETIMEDOUT);
1135                         if (rc == 0) {
1136                                 spin_lock_irqsave (&request->rq_lock, flags);
1137                                 /* Ensure the callback has completed scheduling
1138                                  * me and taken its hands off the request */
1139                                 spin_unlock_irqrestore(&request->rq_lock,flags);
1140                                 break;
1141                         }
1142
1143                         CERROR ("Unexpectedly long timeout: req %p\n", request);
1144                 }
1145                 /* fall through */
1146
1147         case PTL_INV_MD:                        /* callback completed */
1148                 LASSERT(!request->rq_receiving_reply);
1149                 LASSERT(request->rq_replied);
1150                 EXIT;
1151                 return;
1152         }
1153         /* Not Reached */
1154 }
1155
1156 /* caller must hold imp->imp_lock */
1157 void ptlrpc_free_committed(struct obd_import *imp)
1158 {
1159         struct list_head *tmp, *saved;
1160         struct ptlrpc_request *req;
1161         struct ptlrpc_request *last_req = NULL; /* temporary fire escape */
1162         ENTRY;
1163
1164         LASSERT(imp != NULL);
1165
1166 #ifdef CONFIG_SMP
1167         LASSERT(spin_is_locked(&imp->imp_lock));
1168 #endif
1169
1170         CDEBUG(D_HA, "%s: committing for last_committed "LPU64"\n",
1171                imp->imp_obd->obd_name, imp->imp_peer_committed_transno);
1172
1173         list_for_each_safe(tmp, saved, &imp->imp_replay_list) {
1174                 req = list_entry(tmp, struct ptlrpc_request, rq_list);
1175
1176                 /* XXX ok to remove when 1357 resolved - rread 05/29/03  */
1177                 LASSERT(req != last_req);
1178                 last_req = req;
1179
1180                 if (req->rq_import_generation < imp->imp_generation) {
1181                         DEBUG_REQ(D_HA, req, "freeing request with old gen");
1182                         GOTO(free_req, 0);
1183                 }
1184
1185                 if (req->rq_replay) {
1186                         DEBUG_REQ(D_HA, req, "keeping (FL_REPLAY)");
1187                         continue;
1188                 }
1189
1190                 /* not yet committed */
1191                 if (req->rq_transno > imp->imp_peer_committed_transno) {
1192                         DEBUG_REQ(D_HA, req, "stopping search");
1193                         break;
1194                 }
1195
1196                 DEBUG_REQ(D_HA, req, "committing (last_committed "LPU64")",
1197                           imp->imp_peer_committed_transno);
1198 free_req:
1199                 if (req->rq_commit_cb != NULL)
1200                         req->rq_commit_cb(req);
1201                 list_del_init(&req->rq_list);
1202                 __ptlrpc_req_finished(req, 1);
1203         }
1204
1205         EXIT;
1206         return;
1207 }
1208
1209 void ptlrpc_cleanup_client(struct obd_import *imp)
1210 {
1211         ENTRY;
1212         EXIT;
1213         return;
1214 }
1215
1216 void ptlrpc_resend_req(struct ptlrpc_request *req)
1217 {
1218         unsigned long flags;
1219
1220         DEBUG_REQ(D_HA, req, "resending");
1221         req->rq_reqmsg->handle.cookie = 0;
1222         ptlrpc_put_connection(req->rq_connection);
1223         req->rq_connection =
1224                 ptlrpc_connection_addref(req->rq_import->imp_connection);
1225         req->rq_status = -EAGAIN;
1226
1227         spin_lock_irqsave (&req->rq_lock, flags);
1228         req->rq_resend = 1;
1229         req->rq_timedout = 0;
1230         if (req->rq_set != NULL)
1231                 wake_up (&req->rq_set->set_waitq);
1232         else
1233                 wake_up(&req->rq_reply_waitq);
1234         spin_unlock_irqrestore (&req->rq_lock, flags);
1235 }
1236
1237 /* XXX: this function and rq_status are currently unused */
1238 void ptlrpc_restart_req(struct ptlrpc_request *req)
1239 {
1240         unsigned long flags;
1241
1242         DEBUG_REQ(D_HA, req, "restarting (possibly-)completed request");
1243         req->rq_status = -ERESTARTSYS;
1244
1245         spin_lock_irqsave (&req->rq_lock, flags);
1246         req->rq_restart = 1;
1247         req->rq_timedout = 0;
1248         if (req->rq_set != NULL)
1249                 wake_up (&req->rq_set->set_waitq);
1250         else
1251                 wake_up(&req->rq_reply_waitq);
1252         spin_unlock_irqrestore (&req->rq_lock, flags);
1253 }
1254
1255 static int expired_request(void *data)
1256 {
1257         struct ptlrpc_request *req = data;
1258         ENTRY;
1259
1260         RETURN(ptlrpc_expire_one_request(req));
1261 }
1262
1263 static void interrupted_request(void *data)
1264 {
1265         unsigned long flags;
1266
1267         struct ptlrpc_request *req = data;
1268         DEBUG_REQ(D_HA, req, "request interrupted");
1269         spin_lock_irqsave (&req->rq_lock, flags);
1270         req->rq_intr = 1;
1271         spin_unlock_irqrestore (&req->rq_lock, flags);
1272 }
1273
1274 struct ptlrpc_request *ptlrpc_request_addref(struct ptlrpc_request *req)
1275 {
1276         ENTRY;
1277         atomic_inc(&req->rq_refcount);
1278         RETURN(req);
1279 }
1280
1281 void ptlrpc_retain_replayable_request(struct ptlrpc_request *req,
1282                                       struct obd_import *imp)
1283 {
1284         struct list_head *tmp;
1285
1286 #ifdef CONFIG_SMP
1287         LASSERT(spin_is_locked(&imp->imp_lock));
1288 #endif
1289
1290         LASSERT(imp->imp_replayable);
1291         /* Balanced in ptlrpc_free_committed, usually. */
1292         ptlrpc_request_addref(req);
1293         list_for_each_prev(tmp, &imp->imp_replay_list) {
1294                 struct ptlrpc_request *iter =
1295                         list_entry(tmp, struct ptlrpc_request, rq_list);
1296
1297                 /* We may have duplicate transnos if we create and then
1298                  * open a file, or for closes retained if to match creating
1299                  * opens, so use req->rq_xid as a secondary key.
1300                  * (See bugs 684, 685, and 428.)
1301                  * XXX no longer needed, but all opens need transnos!
1302                  */
1303                 if (iter->rq_transno > req->rq_transno)
1304                         continue;
1305
1306                 if (iter->rq_transno == req->rq_transno) {
1307                         LASSERT(iter->rq_xid != req->rq_xid);
1308                         if (iter->rq_xid > req->rq_xid)
1309                                 continue;
1310                 }
1311
1312                 list_add(&req->rq_list, &iter->rq_list);
1313                 return;
1314         }
1315
1316         list_add_tail(&req->rq_list, &imp->imp_replay_list);
1317 }
1318
1319 int ptlrpc_queue_wait(struct ptlrpc_request *req)
1320 {
1321         int rc = 0;
1322         int brc;
1323         struct l_wait_info lwi;
1324         struct obd_import *imp = req->rq_import;
1325         unsigned long flags;
1326         int do_restart = 0;
1327         int timeout = 0;
1328         ENTRY;
1329
1330         LASSERT(req->rq_set == NULL);
1331         LASSERT(!req->rq_receiving_reply);
1332
1333         /* for distributed debugging */
1334         req->rq_reqmsg->status = current->pid;
1335         LASSERT(imp->imp_obd != NULL);
1336         CDEBUG(D_RPCTRACE, "Sending RPC pname:cluuid:pid:xid:ni:nid:opc "
1337                "%s:%s:%d:"LPU64":%s:"LPX64":%d\n", current->comm,
1338                imp->imp_obd->obd_uuid.uuid,
1339                req->rq_reqmsg->status, req->rq_xid,
1340                imp->imp_connection->c_peer.peer_ni->pni_name,
1341                imp->imp_connection->c_peer.peer_nid,
1342                req->rq_reqmsg->opc);
1343
1344         /* Mark phase here for a little debug help */
1345         req->rq_phase = RQ_PHASE_RPC;
1346
1347         spin_lock_irqsave(&imp->imp_lock, flags);
1348         req->rq_import_generation = imp->imp_generation;
1349 restart:
1350         if (ptlrpc_import_delay_req(imp, req, &rc)) {
1351                 list_del(&req->rq_list);
1352
1353                 list_add_tail(&req->rq_list, &imp->imp_delayed_list);
1354                 spin_unlock_irqrestore(&imp->imp_lock, flags);
1355
1356                 DEBUG_REQ(D_HA, req, "\"%s\" waiting for recovery: (%d > %d)",
1357                           current->comm, req->rq_send_state, imp->imp_state);
1358                 lwi = LWI_INTR(interrupted_request, req);
1359                 rc = l_wait_event(req->rq_reply_waitq,
1360                                   (req->rq_send_state == imp->imp_state ||
1361                                    req->rq_err),
1362                                   &lwi);
1363                 DEBUG_REQ(D_HA, req, "\"%s\" awake: (%d > %d or %d == 1)",
1364                           current->comm, imp->imp_state, req->rq_send_state,
1365                           req->rq_err);
1366
1367                 spin_lock_irqsave(&imp->imp_lock, flags);
1368                 list_del_init(&req->rq_list);
1369
1370                 if (req->rq_err) {
1371                         rc = -EIO;
1372                 }
1373                 else if (req->rq_intr) {
1374                         rc = -EINTR;
1375                 }
1376                 else {
1377                         GOTO(restart, rc);
1378                 }
1379         }
1380
1381         if (rc != 0) {
1382                 list_del_init(&req->rq_list);
1383                 spin_unlock_irqrestore(&imp->imp_lock, flags);
1384                 req->rq_status = rc; // XXX this ok?
1385                 GOTO(out, rc);
1386         }
1387
1388         /* XXX this is the same as ptlrpc_set_wait */
1389         LASSERT(list_empty(&req->rq_list));
1390         list_add_tail(&req->rq_list, &imp->imp_sending_list);
1391         spin_unlock_irqrestore(&imp->imp_lock, flags);
1392
1393         rc = ptl_send_rpc(req);
1394         if (rc) {
1395                 DEBUG_REQ(D_HA, req, "send failed (%d); recovering", rc);
1396                 timeout = 1;
1397         } else {
1398                 timeout = MAX(req->rq_timeout * HZ, 1);
1399                 DEBUG_REQ(D_NET, req, "-- sleeping");
1400         }
1401         lwi = LWI_TIMEOUT_INTR(timeout, expired_request, interrupted_request,
1402                                req);
1403         l_wait_event(req->rq_reply_waitq, ptlrpc_check_reply(req), &lwi);
1404         DEBUG_REQ(D_NET, req, "-- done sleeping");
1405
1406         CDEBUG(D_RPCTRACE, "Completed RPC pname:cluuid:pid:xid:ni:nid:opc "
1407                "%s:%s:%d:"LPU64":%s:"LPX64":%d\n", current->comm,
1408                imp->imp_obd->obd_uuid.uuid,
1409                req->rq_reqmsg->status, req->rq_xid,
1410                imp->imp_connection->c_peer.peer_ni->pni_name,
1411                imp->imp_connection->c_peer.peer_nid,
1412                req->rq_reqmsg->opc);
1413
1414         spin_lock_irqsave(&imp->imp_lock, flags);
1415         list_del_init(&req->rq_list);
1416         spin_unlock_irqrestore(&imp->imp_lock, flags);
1417
1418         /* If the reply was received normally, this just grabs the spinlock
1419          * (ensuring the reply callback has returned), sees that
1420          * req->rq_receiving_reply is clear and returns. */
1421         ptlrpc_unregister_reply (req);
1422
1423         if (req->rq_err)
1424                 GOTO(out, rc = -EIO);
1425
1426         /* Resend if we need to, unless we were interrupted. */
1427         if (req->rq_resend && !req->rq_intr) {
1428                 /* ...unless we were specifically told otherwise. */
1429                 if (req->rq_no_resend)
1430                         GOTO(out, rc = -ETIMEDOUT);
1431                 spin_lock_irqsave (&req->rq_lock, flags);
1432                 req->rq_resend = 0;
1433                 spin_unlock_irqrestore (&req->rq_lock, flags);
1434                 lustre_msg_add_flags(req->rq_reqmsg, MSG_RESENT);
1435
1436                 if (req->rq_bulk != NULL)
1437                         ptlrpc_unregister_bulk (req);
1438
1439                 DEBUG_REQ(D_HA, req, "resending: ");
1440                 spin_lock_irqsave(&imp->imp_lock, flags);
1441                 goto restart;
1442         }
1443
1444         if (req->rq_intr) {
1445                 /* Should only be interrupted if we timed out. */
1446                 if (!req->rq_timedout)
1447                         DEBUG_REQ(D_ERROR, req,
1448                                   "rq_intr set but rq_timedout not");
1449                 GOTO(out, rc = -EINTR);
1450         }
1451
1452         if (req->rq_timedout) {                 /* non-recoverable timeout */
1453                 GOTO(out, rc = -ETIMEDOUT);
1454         }
1455
1456         if (!req->rq_replied) {
1457                 /* How can this be? -eeb */
1458                 DEBUG_REQ(D_ERROR, req, "!rq_replied: ");
1459                 LBUG();
1460                 GOTO(out, rc = req->rq_status);
1461         }
1462
1463         rc = after_reply (req, &do_restart);
1464         /* NB may return +ve success rc */
1465         if (do_restart) {
1466                 if (req->rq_bulk != NULL)
1467                         ptlrpc_unregister_bulk (req);
1468                 DEBUG_REQ(D_HA, req, "resending: ");
1469                 spin_lock_irqsave(&imp->imp_lock, flags);
1470                 goto restart;
1471         }
1472
1473  out:
1474         if (req->rq_bulk != NULL) {
1475                 if (rc >= 0) {                  /* success so far */
1476                         lwi = LWI_TIMEOUT(timeout, NULL, NULL);
1477                         brc = l_wait_event(req->rq_reply_waitq,
1478                                            ptlrpc_bulk_complete(req->rq_bulk),
1479                                            &lwi);
1480                         if (brc != 0) {
1481                                 LASSERT(brc == -ETIMEDOUT);
1482                                 CERROR ("Timed out waiting for bulk\n");
1483                                 rc = brc;
1484                         }
1485                 }
1486                 if (rc < 0)
1487                         ptlrpc_unregister_bulk (req);
1488         }
1489
1490         LASSERT(!req->rq_receiving_reply);
1491         req->rq_phase = RQ_PHASE_INTERPRET;
1492         RETURN(rc);
1493 }
1494
1495 int ptlrpc_replay_req(struct ptlrpc_request *req)
1496 {
1497         int rc = 0, old_state, old_status = 0;
1498         // struct ptlrpc_client *cli = req->rq_import->imp_client;
1499         struct l_wait_info lwi;
1500         ENTRY;
1501
1502         LASSERT(req->rq_import->imp_state == LUSTRE_IMP_REPLAY);
1503
1504         /* I don't touch rq_phase here, so the debug log can show what
1505          * state it was left in */
1506
1507         /* Not handling automatic bulk replay yet (or ever?) */
1508         LASSERT(req->rq_bulk == NULL);
1509
1510         DEBUG_REQ(D_NET, req, "about to replay");
1511
1512         /* Update request's state, since we might have a new connection. */
1513         ptlrpc_put_connection(req->rq_connection);
1514         req->rq_connection =
1515                 ptlrpc_connection_addref(req->rq_import->imp_connection);
1516
1517         /* temporarily set request to REPLAY level---not strictly
1518          * necessary since ptl_send_rpc doesn't check state, but let's
1519          * be consistent.*/
1520         old_state = req->rq_send_state;
1521
1522         /*
1523          * Q: "How can a req get on the replay list if it wasn't replied?"
1524          * A: "If we failed during the replay of this request, it will still
1525          *     be on the list, but rq_replied will have been reset to 0."
1526          */
1527         if (req->rq_replied)
1528                 old_status = req->rq_repmsg->status;
1529         req->rq_send_state = LUSTRE_IMP_REPLAY;
1530         rc = ptl_send_rpc(req);
1531         if (rc) {
1532                 CERROR("error %d, opcode %d\n", rc, req->rq_reqmsg->opc);
1533                 ptlrpc_cleanup_request_buf(req);
1534                 // up(&cli->cli_rpc_sem);
1535                 GOTO(out, rc = -rc);
1536         }
1537
1538         CDEBUG(D_OTHER, "-- sleeping\n");
1539         lwi = LWI_INTR(NULL, NULL); /* XXX needs timeout, nested recovery */
1540         l_wait_event(req->rq_reply_waitq, ptlrpc_check_reply(req), &lwi);
1541         CDEBUG(D_OTHER, "-- done\n");
1542
1543         // up(&cli->cli_rpc_sem);
1544
1545         /* If the reply was received normally, this just grabs the spinlock
1546          * (ensuring the reply callback has returned), sees that
1547          * req->rq_receiving_reply is clear and returns. */
1548         ptlrpc_unregister_reply (req);
1549
1550         if (!req->rq_replied) {
1551                 CERROR("Unknown reason for wakeup\n");
1552                 /* XXX Phil - I end up here when I kill obdctl */
1553                 /* ...that's because signals aren't all masked in
1554                  * l_wait_event() -eeb */
1555                 GOTO(out, rc = -EINTR);
1556         }
1557
1558 #if SWAB_PARANOIA
1559         /* Clear reply swab mask; this is a new reply in sender's byte order */
1560         req->rq_rep_swab_mask = 0;
1561 #endif
1562         rc = lustre_unpack_msg(req->rq_repmsg, req->rq_replen);
1563         if (rc) {
1564                 CERROR("unpack_rep failed: %d\n", rc);
1565                 GOTO(out, rc = -EPROTO);
1566         }
1567 #if 0
1568         /* FIXME: Enable when BlueArc makes new release */
1569         if (req->rq_repmsg->type != PTL_RPC_MSG_REPLY &&
1570             req->rq_repmsg->type != PTL_RPC_MSG_ERR) {
1571                 CERROR("invalid packet type received (type=%u)\n",
1572                        req->rq_repmsg->type);
1573                 GOTO(out, rc = -EPROTO);
1574         }
1575 #endif
1576
1577         if (req->rq_repmsg->type == PTL_RPC_MSG_ERR &&
1578             req->rq_repmsg->status == -ENOTCONN)
1579                 GOTO(out, rc = req->rq_repmsg->status);
1580
1581         /* The transno had better not change over replay. */
1582         LASSERT(req->rq_reqmsg->transno == req->rq_repmsg->transno);
1583
1584         CDEBUG(D_NET, "got rep "LPD64"\n", req->rq_xid);
1585
1586         /* let the callback do fixups, possibly including in the request */
1587         if (req->rq_replay_cb)
1588                 req->rq_replay_cb(req);
1589
1590         if (req->rq_replied && req->rq_repmsg->status != old_status) {
1591                 DEBUG_REQ(D_ERROR, req, "status %d, old was %d",
1592                           req->rq_repmsg->status, old_status);
1593         } else {
1594                 /* Put it back for re-replay. */
1595                 req->rq_status = old_status;
1596         }
1597
1598  out:
1599         req->rq_send_state = old_state;
1600         RETURN(rc);
1601 }
1602
1603 void ptlrpc_abort_inflight(struct obd_import *imp)
1604 {
1605         unsigned long flags;
1606         struct list_head *tmp, *n;
1607         ENTRY;
1608
1609         /* Make sure that no new requests get processed for this import.
1610          * ptlrpc_{queue,set}_wait must (and does) hold imp_lock while testing
1611          * this flag and then putting requests on sending_list or delayed_list.
1612          */
1613         spin_lock_irqsave(&imp->imp_lock, flags);
1614
1615         /* XXX locking?  Maybe we should remove each request with the list
1616          * locked?  Also, how do we know if the requests on the list are
1617          * being freed at this time?
1618          */
1619         list_for_each_safe(tmp, n, &imp->imp_sending_list) {
1620                 struct ptlrpc_request *req =
1621                         list_entry(tmp, struct ptlrpc_request, rq_list);
1622
1623                 DEBUG_REQ(D_HA, req, "inflight");
1624
1625                 spin_lock (&req->rq_lock);
1626                 if (req->rq_import_generation < imp->imp_generation) {
1627                         req->rq_err = 1;
1628                         if (req->rq_set != NULL)
1629                                 wake_up(&req->rq_set->set_waitq);
1630                         else
1631                                 wake_up(&req->rq_reply_waitq);
1632                 }
1633                 spin_unlock (&req->rq_lock);
1634         }
1635
1636         list_for_each_safe(tmp, n, &imp->imp_delayed_list) {
1637                 struct ptlrpc_request *req =
1638                         list_entry(tmp, struct ptlrpc_request, rq_list);
1639
1640                 DEBUG_REQ(D_HA, req, "aborting waiting req");
1641
1642                 spin_lock (&req->rq_lock);
1643                 if (req->rq_import_generation < imp->imp_generation) {
1644                         req->rq_err = 1;
1645                         if (req->rq_set != NULL)
1646                                 wake_up(&req->rq_set->set_waitq);
1647                         else
1648                                 wake_up(&req->rq_reply_waitq);
1649                 }
1650                 spin_unlock (&req->rq_lock);
1651         }
1652
1653         /* Last chance to free reqs left on the replay list, but we
1654          * will still leak reqs that haven't comitted.  */
1655         if (imp->imp_replayable)
1656                 ptlrpc_free_committed(imp);
1657
1658         spin_unlock_irqrestore(&imp->imp_lock, flags);
1659
1660         EXIT;
1661 }
1662
1663 static __u64 ptlrpc_last_xid = 0;
1664 static spinlock_t ptlrpc_last_xid_lock = SPIN_LOCK_UNLOCKED;
1665
1666 __u64 ptlrpc_next_xid(void)
1667 {
1668         __u64 tmp;
1669         spin_lock(&ptlrpc_last_xid_lock);
1670         tmp = ++ptlrpc_last_xid;
1671         spin_unlock(&ptlrpc_last_xid_lock);
1672         return tmp;
1673 }
1674
1675