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 #include <linux/lustre_sec.h>
  36
  37 #include "ptlrpc_internal.h"
  38
  39 void ptlrpc_init_client(int req_portal, int rep_portal, char *name,
  40                         struct ptlrpc_client *cl)
  41 {
  42         cl->cli_request_portal = req_portal;
  43         cl->cli_reply_portal   = rep_portal;
  44         cl->cli_name           = name;
  45 }
  46
  47 struct ptlrpc_connection *ptlrpc_uuid_to_connection(struct obd_uuid *uuid)
  48 {
  49         struct ptlrpc_connection *c;
  50         struct ptlrpc_peer peer;
  51         int err;
  52
  53         err = ptlrpc_uuid_to_peer(uuid, &peer);
  54         if (err != 0) {
  55                 CERROR("cannot find peer %s!\n", uuid->uuid);
  56                 return NULL;
  57         }
  58
  59         c = ptlrpc_get_connection(&peer, uuid);
  60         if (c) {
  61                 memcpy(c->c_remote_uuid.uuid,
  62                        uuid->uuid, sizeof(c->c_remote_uuid.uuid));
  63         }
  64
  65         CDEBUG(D_INFO, "%s -> %p\n", uuid->uuid, c);
  66
  67         return c;
  68 }
  69
  70 void ptlrpc_readdress_connection(struct ptlrpc_connection *conn,
  71                                  struct obd_uuid *uuid)
  72 {
  73         struct ptlrpc_peer peer;
  74         int err;
  75
  76         err = ptlrpc_uuid_to_peer(uuid, &peer);
  77         if (err != 0) {
  78                 CERROR("cannot find peer %s!\n", uuid->uuid);
  79                 return;
  80         }
  81
  82         memcpy(&conn->c_peer, &peer, sizeof (peer));
  83         return;
  84 }
  85
  86 static inline struct ptlrpc_bulk_desc *new_bulk(int npages, int type, int portal)
  87 {
  88         struct ptlrpc_bulk_desc *desc;
  89
  90         OBD_ALLOC(desc, offsetof (struct ptlrpc_bulk_desc, bd_iov[npages]));
  91         if (!desc)
  92                 return NULL;
  93
  94         spin_lock_init(&desc->bd_lock);
  95         init_waitqueue_head(&desc->bd_waitq);
  96         desc->bd_max_iov = npages;
  97         desc->bd_iov_count = 0;
  98         desc->bd_md_h = PTL_INVALID_HANDLE;
  99         desc->bd_portal = portal;
 100         desc->bd_type = type;
 101
 102         return desc;
 103 }
 104
 105 struct ptlrpc_bulk_desc *ptlrpc_prep_bulk_imp (struct ptlrpc_request *req,
 106                                                int npages, int type, int portal)
 107 {
 108         struct obd_import *imp = req->rq_import;
 109         struct ptlrpc_bulk_desc *desc;
 110
 111         LASSERT(type == BULK_PUT_SINK || type == BULK_GET_SOURCE);
 112         desc = new_bulk(npages, type, portal);
 113         if (desc == NULL)
 114                 RETURN(NULL);
 115
 116         desc->bd_import_generation = req->rq_import_generation;
 117         desc->bd_import = class_import_get(imp);
 118         desc->bd_req = req;
 119
 120         desc->bd_cbid.cbid_fn  = client_bulk_callback;
 121         desc->bd_cbid.cbid_arg = desc;
 122
 123         /* This makes req own desc, and free it when she frees herself */
 124         req->rq_bulk = desc;
 125
 126         return desc;
 127 }
 128
 129 struct ptlrpc_bulk_desc *ptlrpc_prep_bulk_exp (struct ptlrpc_request *req,
 130                                                int npages, int type, int portal)
 131 {
 132         struct obd_export *exp = req->rq_export;
 133         struct ptlrpc_bulk_desc *desc;
 134
 135         LASSERT(type == BULK_PUT_SOURCE || type == BULK_GET_SINK);
 136
 137         desc = new_bulk(npages, type, portal);
 138         if (desc == NULL)
 139                 RETURN(NULL);
 140
 141         desc->bd_export = class_export_get(exp);
 142         desc->bd_req = req;
 143
 144         desc->bd_cbid.cbid_fn  = server_bulk_callback;
 145         desc->bd_cbid.cbid_arg = desc;
 146
 147         /* NB we don't assign rq_bulk here; server-side requests are
 148          * re-used, and the handler frees the bulk desc explicitly. */
 149
 150         return desc;
 151 }
 152
 153 void ptlrpc_prep_bulk_page(struct ptlrpc_bulk_desc *desc,
 154                            struct page *page, int pageoffset, int len)
 155 {
 156         LASSERT(desc->bd_iov_count < desc->bd_max_iov);
 157         LASSERT(page != NULL);
 158         LASSERT(pageoffset >= 0);
 159         LASSERT(len > 0);
 160         LASSERT(pageoffset + len <= PAGE_SIZE);
 161
 162         desc->bd_nob += len;
 163
 164         ptlrpc_add_bulk_page(desc, page, pageoffset, len);
 165 }
 166
 167 void ptlrpc_free_bulk(struct ptlrpc_bulk_desc *desc)
 168 {
 169         ENTRY;
 170
 171         LASSERT(desc != NULL);
 172         LASSERT(desc->bd_iov_count != LI_POISON); /* not freed already */
 173         LASSERT(!desc->bd_network_rw);         /* network hands off or */
 174         LASSERT((desc->bd_export != NULL) ^ (desc->bd_import != NULL));
 175         if (desc->bd_export)
 176                 class_export_put(desc->bd_export);
 177         else
 178                 class_import_put(desc->bd_import);
 179
 180         OBD_FREE(desc, offsetof(struct ptlrpc_bulk_desc,
 181                                 bd_iov[desc->bd_max_iov]));
 182         EXIT;
 183 }
 184
 185 /* FIXME prep_req now should return error code other than NULL. but
 186  * this is called everywhere :(
 187  */
 188 struct ptlrpc_request *ptlrpc_prep_req(struct obd_import *imp, __u32 version,
 189                                        int opcode, int count, int *lengths,
 190                                        char **bufs)
 191 {
 192         struct ptlrpc_request *request;
 193         int rc;
 194         ENTRY;
 195
 196         LASSERT((unsigned long)imp > 0x1000);
 197
 198         OBD_ALLOC(request, sizeof(*request));
 199         if (!request) {
 200                 CERROR("request allocation out of memory\n");
 201                 RETURN(NULL);
 202         }
 203
 204         request->rq_import = class_import_get(imp);
 205
 206         rc = ptlrpcs_req_get_cred(request);
 207         if (rc) {
 208                 CDEBUG(D_SEC, "failed to get credential\n");
 209                 GOTO(out_free, rc);
 210         }
 211
 212         /* just a try on refresh, but we proceed even if it failed */
 213         rc = ptlrpcs_cred_refresh(request->rq_cred);
 214         if (!ptlrpcs_cred_is_uptodate(request->rq_cred)) {
 215                 CERROR("req %p: failed to refresh cred %p, rc %d, continue\n",
 216                        request, request->rq_cred, rc);
 217         }
 218
 219         rc = lustre_pack_request(request, count, lengths, bufs);
 220         if (rc) {
 221                 CERROR("cannot pack request %d\n", rc);
 222                 GOTO(out_cred, rc);
 223         }
 224         request->rq_reqmsg->version |= version;
 225
 226         if (imp->imp_server_timeout)
 227                 request->rq_timeout = obd_timeout / 2;
 228         else
 229                 request->rq_timeout = obd_timeout;
 230
 231         request->rq_send_state = LUSTRE_IMP_FULL;
 232         request->rq_type = PTL_RPC_MSG_REQUEST;
 233
 234         request->rq_req_cbid.cbid_fn  = request_out_callback;
 235         request->rq_req_cbid.cbid_arg = request;
 236
 237         request->rq_reply_cbid.cbid_fn  = reply_in_callback;
 238         request->rq_reply_cbid.cbid_arg = request;
 239
 240         request->rq_phase = RQ_PHASE_NEW;
 241
 242         /* XXX FIXME bug 249 */
 243         request->rq_request_portal = imp->imp_client->cli_request_portal;
 244         request->rq_reply_portal = imp->imp_client->cli_reply_portal;
 245
 246         spin_lock_init(&request->rq_lock);
 247         INIT_LIST_HEAD(&request->rq_list);
 248         INIT_LIST_HEAD(&request->rq_replay_list);
 249         INIT_LIST_HEAD(&request->rq_set_chain);
 250         init_waitqueue_head(&request->rq_reply_waitq);
 251         request->rq_xid = ptlrpc_next_xid();
 252         atomic_set(&request->rq_refcount, 1);
 253
 254         request->rq_reqmsg->opc = opcode;
 255         request->rq_reqmsg->flags = 0;
 256         RETURN(request);
 257 out_cred:
 258         ptlrpcs_req_drop_cred(request);
 259 out_free:
 260         class_import_put(imp);
 261         OBD_FREE(request, sizeof(*request));
 262         RETURN(NULL);
 263 }
 264
 265 struct ptlrpc_request_set *ptlrpc_prep_set(void)
 266 {
 267         struct ptlrpc_request_set *set;
 268
 269         OBD_ALLOC(set, sizeof *set);
 270         if (!set)
 271                 RETURN(NULL);
 272         INIT_LIST_HEAD(&set->set_requests);
 273         init_waitqueue_head(&set->set_waitq);
 274         set->set_remaining = 0;
 275         spin_lock_init(&set->set_new_req_lock);
 276         INIT_LIST_HEAD(&set->set_new_requests);
 277
 278         RETURN(set);
 279 }
 280
 281 /* Finish with this set; opposite of prep_set. */
 282 void ptlrpc_set_destroy(struct ptlrpc_request_set *set)
 283 {
 284         struct list_head *tmp;
 285         struct list_head *next;
 286         int               expected_phase;
 287         int               n = 0;
 288         ENTRY;
 289
 290         /* Requests on the set should either all be completed, or all be new */
 291         expected_phase = (set->set_remaining == 0) ?
 292                          RQ_PHASE_COMPLETE : RQ_PHASE_NEW;
 293         list_for_each (tmp, &set->set_requests) {
 294                 struct ptlrpc_request *req =
 295                         list_entry(tmp, struct ptlrpc_request, rq_set_chain);
 296
 297                 LASSERT(req->rq_phase == expected_phase);
 298                 n++;
 299         }
 300
 301         LASSERT(set->set_remaining == 0 || set->set_remaining == n);
 302
 303         list_for_each_safe(tmp, next, &set->set_requests) {
 304                 struct ptlrpc_request *req =
 305                         list_entry(tmp, struct ptlrpc_request, rq_set_chain);
 306                 list_del_init(&req->rq_set_chain);
 307
 308                 LASSERT(req->rq_phase == expected_phase);
 309
 310                 if (req->rq_phase == RQ_PHASE_NEW) {
 311
 312                         if (req->rq_interpret_reply != NULL) {
 313                                 int (*interpreter)(struct ptlrpc_request *,
 314                                                    void *, int) =
 315                                         req->rq_interpret_reply;
 316
 317                                 /* higher level (i.e. LOV) failed;
 318                                  * let the sub reqs clean up */
 319                                 req->rq_status = -EBADR;
 320                                 interpreter(req, &req->rq_async_args,
 321                                             req->rq_status);
 322                         }
 323                         set->set_remaining--;
 324                 }
 325
 326                 req->rq_set = NULL;
 327                 ptlrpc_req_finished (req);
 328         }
 329
 330         LASSERT(set->set_remaining == 0);
 331
 332         OBD_FREE(set, sizeof(*set));
 333         EXIT;
 334 }
 335
 336 void ptlrpc_set_add_req(struct ptlrpc_request_set *set,
 337                         struct ptlrpc_request *req)
 338 {
 339         /* The set takes over the caller's request reference */
 340         list_add_tail(&req->rq_set_chain, &set->set_requests);
 341         req->rq_set = set;
 342         set->set_remaining++;
 343         atomic_inc(&req->rq_import->imp_inflight);
 344 }
 345
 346 /* lock so many callers can add things, the context that owns the set
 347  * is supposed to notice these and move them into the set proper. */
 348 void ptlrpc_set_add_new_req(struct ptlrpc_request_set *set,
 349                             struct ptlrpc_request *req)
 350 {
 351         unsigned long flags;
 352         spin_lock_irqsave(&set->set_new_req_lock, flags);
 353         /* The set takes over the caller's request reference */
 354         list_add_tail(&req->rq_set_chain, &set->set_new_requests);
 355         req->rq_set = set;
 356         spin_unlock_irqrestore(&set->set_new_req_lock, flags);
 357 }
 358
 359 /*
 360  * Based on the current state of the import, determine if the request
 361  * can be sent, is an error, or should be delayed.
 362  *
 363  * Returns true if this request should be delayed. If false, and
 364  * *status is set, then the request can not be sent and *status is the
 365  * error code.  If false and status is 0, then request can be sent.
 366  *
 367  * The imp->imp_lock must be held.
 368  */
 369 static int ptlrpc_import_delay_req(struct obd_import *imp,
 370                                    struct ptlrpc_request *req, int *status)
 371 {
 372         int delay = 0;
 373         ENTRY;
 374
 375         LASSERT (status != NULL);
 376         *status = 0;
 377
 378         if (imp->imp_state == LUSTRE_IMP_NEW) {
 379                 DEBUG_REQ(D_ERROR, req, "Uninitialized import.");
 380                 *status = -EIO;
 381                 LBUG();
 382         }
 383         else if (imp->imp_state == LUSTRE_IMP_CLOSED) {
 384                 DEBUG_REQ(D_ERROR, req, "IMP_CLOSED ");
 385                 *status = -EIO;
 386         }
 387         /* allow CONNECT even if import is invalid */
 388         else if (req->rq_send_state == LUSTRE_IMP_CONNECTING &&
 389                  imp->imp_state == LUSTRE_IMP_CONNECTING) {
 390                 ;
 391         }
 392         /*
 393          * If the import has been invalidated (such as by an OST failure), the
 394          * request must fail with -EIO.
 395          */
 396         else if (imp->imp_invalid) {
 397                 DEBUG_REQ(D_ERROR, req, "IMP_INVALID");
 398                 *status = -EIO;
 399         }
 400         else if (req->rq_import_generation != imp->imp_generation) {
 401                 DEBUG_REQ(D_ERROR, req, "req wrong generation:");
 402                 *status = -EIO;
 403         }
 404         else if (req->rq_send_state != imp->imp_state) {
 405                 if (imp->imp_obd->obd_no_recov || imp->imp_dlm_fake
 406                     || req->rq_no_delay)
 407                         *status = -EWOULDBLOCK;
 408                 else
 409                         delay = 1;
 410         }
 411
 412         RETURN(delay);
 413 }
 414
 415 static int ptlrpc_check_reply(struct ptlrpc_request *req)
 416 {
 417         unsigned long flags;
 418         int rc = 0;
 419         ENTRY;
 420
 421         /* serialise with network callback */
 422         spin_lock_irqsave (&req->rq_lock, flags);
 423
 424         if (req->rq_replied) {
 425                 DEBUG_REQ(D_NET, req, "REPLIED:");
 426                 GOTO(out, rc = 1);
 427         }
 428
 429         if (req->rq_net_err && !req->rq_timedout) {
 430                 spin_unlock_irqrestore (&req->rq_lock, flags);
 431                 rc = ptlrpc_expire_one_request(req);
 432                 spin_lock_irqsave (&req->rq_lock, flags);
 433                 GOTO(out, rc);
 434         }
 435
 436         if (req->rq_err) {
 437                 DEBUG_REQ(D_ERROR, req, "ABORTED:");
 438                 GOTO(out, rc = 1);
 439         }
 440
 441         if (req->rq_resend) {
 442                 DEBUG_REQ(D_ERROR, req, "RESEND:");
 443                 GOTO(out, rc = 1);
 444         }
 445
 446         if (req->rq_restart) {
 447                 DEBUG_REQ(D_ERROR, req, "RESTART:");
 448                 GOTO(out, rc = 1);
 449         }
 450         EXIT;
 451  out:
 452         spin_unlock_irqrestore (&req->rq_lock, flags);
 453         DEBUG_REQ(D_NET, req, "rc = %d for", rc);
 454         return rc;
 455 }
 456
 457 static int ptlrpc_check_status(struct ptlrpc_request *req)
 458 {
 459         int err;
 460         ENTRY;
 461
 462         err = req->rq_repmsg->status;
 463         if (req->rq_repmsg->type == PTL_RPC_MSG_ERR) {
 464                 DEBUG_REQ(D_ERROR, req, "type == PTL_RPC_MSG_ERR, err == %d",
 465                           err);
 466                 RETURN(err < 0 ? err : -EINVAL);
 467         }
 468
 469         if (err < 0) {
 470                 DEBUG_REQ(D_INFO, req, "status is %d", err);
 471         } else if (err > 0) {
 472                 /* XXX: translate this error from net to host */
 473                 DEBUG_REQ(D_INFO, req, "status is %d", err);
 474         }
 475
 476         RETURN(err);
 477 }
 478
 479 static int after_reply(struct ptlrpc_request *req)
 480 {
 481         unsigned long flags;
 482         struct obd_import *imp = req->rq_import;
 483         int rc;
 484         ENTRY;
 485
 486         LASSERT(!req->rq_receiving_reply);
 487
 488         /* NB Until this point, the whole of the incoming message,
 489          * including buflens, status etc is in the sender's byte order. */
 490
 491 #if SWAB_PARANOIA
 492         /* Clear reply swab mask; this is a new reply in sender's byte order */
 493         req->rq_rep_swab_mask = 0;
 494 #endif
 495         LASSERT (req->rq_nob_received <= req->rq_repbuf_len);
 496         rc = ptlrpcs_cli_unwrap_reply(req);
 497         if (rc) {
 498                 CERROR("verify reply error: %d\n", rc);
 499                 RETURN(rc);
 500         }
 501         /* unwrap_reply may request rpc be resend */
 502         if (req->rq_ptlrpcs_restart) {
 503                 req->rq_resend = 1;
 504                 RETURN(0);
 505         }
 506
 507         /* unwrap_reply will set rq_replen as the actual received
 508          * lustre_msg length
 509          */
 510         rc = lustre_unpack_msg(req->rq_repmsg, req->rq_replen);
 511         if (rc) {
 512                 CERROR("unpack_rep failed: %d\n", rc);
 513                 RETURN(-EPROTO);
 514         }
 515
 516         if (req->rq_repmsg->type != PTL_RPC_MSG_REPLY &&
 517             req->rq_repmsg->type != PTL_RPC_MSG_ERR) {
 518                 CERROR("invalid packet type received (type=%u)\n",
 519                        req->rq_repmsg->type);
 520                 RETURN(-EPROTO);
 521         }
 522
 523         rc = ptlrpc_check_status(req);
 524
 525         /* Either we've been evicted, or the server has failed for
 526          * some reason. Try to reconnect, and if that fails, punt to the
 527          * upcall. */
 528         if (rc == -ENOTCONN) {
 529                 if (req->rq_send_state != LUSTRE_IMP_FULL ||
 530                     imp->imp_obd->obd_no_recov || imp->imp_dlm_fake) {
 531                         RETURN(-ENOTCONN);
 532                 }
 533
 534                 ptlrpc_request_handle_notconn(req);
 535
 536                 RETURN(rc);
 537         }
 538
 539         /* Store transno in reqmsg for replay. */
 540         req->rq_reqmsg->transno = req->rq_transno = req->rq_repmsg->transno;
 541
 542
 543         if (req->rq_import->imp_replayable) {
 544                 spin_lock_irqsave(&imp->imp_lock, flags);
 545                 if (req->rq_transno != 0)
 546                         ptlrpc_retain_replayable_request(req, imp);
 547                 else if (req->rq_commit_cb != NULL) {
 548                         spin_unlock_irqrestore(&imp->imp_lock, flags);
 549                         req->rq_commit_cb(req);
 550                         spin_lock_irqsave(&imp->imp_lock, flags);
 551                 }
 552
 553                 if (req->rq_transno > imp->imp_max_transno)
 554                         imp->imp_max_transno = req->rq_transno;
 555
 556                 /* Replay-enabled imports return commit-status information. */
 557                 if (req->rq_repmsg->last_committed)
 558                         imp->imp_peer_committed_transno =
 559                                 req->rq_repmsg->last_committed;
 560                 ptlrpc_free_committed(imp);
 561                 spin_unlock_irqrestore(&imp->imp_lock, flags);
 562         }
 563
 564         RETURN(rc);
 565 }
 566
 567 static int ptlrpc_send_new_req(struct ptlrpc_request *req)
 568 {
 569         char                   str[PTL_NALFMT_SIZE];
 570         struct obd_import     *imp;
 571         unsigned long          flags;
 572         int rc;
 573         ENTRY;
 574
 575         LASSERT(req->rq_phase == RQ_PHASE_NEW);
 576         req->rq_phase = RQ_PHASE_RPC;
 577
 578         imp = req->rq_import;
 579         spin_lock_irqsave(&imp->imp_lock, flags);
 580
 581         req->rq_import_generation = imp->imp_generation;
 582
 583         if (ptlrpc_import_delay_req(imp, req, &rc)) {
 584                 spin_lock (&req->rq_lock);
 585                 req->rq_waiting = 1;
 586                 spin_unlock (&req->rq_lock);
 587
 588                 DEBUG_REQ(D_HA, req, "req from PID %d waiting for recovery: "
 589                           "(%s != %s)",
 590                           req->rq_reqmsg->status,
 591                           ptlrpc_import_state_name(req->rq_send_state),
 592                           ptlrpc_import_state_name(imp->imp_state));
 593                 LASSERT(list_empty (&req->rq_list));
 594
 595                 list_add_tail(&req->rq_list, &imp->imp_delayed_list);
 596                 spin_unlock_irqrestore(&imp->imp_lock, flags);
 597                 RETURN(0);
 598         }
 599
 600         if (rc != 0) {
 601                 spin_unlock_irqrestore(&imp->imp_lock, flags);
 602                 req->rq_status = rc;
 603                 req->rq_phase = RQ_PHASE_INTERPRET;
 604                 RETURN(rc);
 605         }
 606
 607         /* XXX this is the same as ptlrpc_queue_wait */
 608         LASSERT(list_empty(&req->rq_list));
 609         list_add_tail(&req->rq_list, &imp->imp_sending_list);
 610         spin_unlock_irqrestore(&imp->imp_lock, flags);
 611
 612         req->rq_reqmsg->status = current->pid;
 613         CDEBUG(D_RPCTRACE, "Sending RPC pname:cluuid:pid:xid:ni:nid:opc"
 614                " %s:%s:%d:"LPU64":%s:%s:%d\n", current->comm,
 615                imp->imp_obd->obd_uuid.uuid, req->rq_reqmsg->status,
 616                req->rq_xid,
 617                imp->imp_connection->c_peer.peer_ni->pni_name,
 618                ptlrpc_peernid2str(&imp->imp_connection->c_peer, str),
 619                req->rq_reqmsg->opc);
 620
 621         rc = ptl_send_rpc(req);
 622         if (rc) {
 623                 DEBUG_REQ(D_HA, req, "send failed (%d); expect timeout", rc);
 624                 req->rq_net_err = 1;
 625                 RETURN(rc);
 626         }
 627         RETURN(0);
 628 }
 629
 630 int ptlrpc_check_set(struct ptlrpc_request_set *set)
 631 {
 632         char str[PTL_NALFMT_SIZE];
 633         unsigned long flags;
 634         struct list_head *tmp;
 635         int force_timer_recalc = 0;
 636         ENTRY;
 637
 638         if (set->set_remaining == 0)
 639                 RETURN(1);
 640
 641         list_for_each(tmp, &set->set_requests) {
 642                 struct ptlrpc_request *req =
 643                         list_entry(tmp, struct ptlrpc_request, rq_set_chain);
 644                 struct obd_import *imp = req->rq_import;
 645                 int rc = 0;
 646
 647                 if (req->rq_phase == RQ_PHASE_NEW &&
 648                     ptlrpc_send_new_req(req)) {
 649                         force_timer_recalc = 1;
 650                 }
 651
 652                 if (!(req->rq_phase == RQ_PHASE_RPC ||
 653                       req->rq_phase == RQ_PHASE_BULK ||
 654                       req->rq_phase == RQ_PHASE_INTERPRET ||
 655                       req->rq_phase == RQ_PHASE_COMPLETE)) {
 656                         DEBUG_REQ(D_ERROR, req, "bad phase %x", req->rq_phase);
 657                         LBUG();
 658                 }
 659
 660                 if (req->rq_phase == RQ_PHASE_COMPLETE)
 661                         continue;
 662
 663                 if (req->rq_phase == RQ_PHASE_INTERPRET)
 664                         GOTO(interpret, req->rq_status);
 665
 666                 if (req->rq_net_err && !req->rq_timedout)
 667                         ptlrpc_expire_one_request(req);
 668
 669                 if (req->rq_err) {
 670                         ptlrpc_unregister_reply(req);
 671                         if (req->rq_status == 0)
 672                                 req->rq_status = -EIO;
 673                         req->rq_phase = RQ_PHASE_INTERPRET;
 674
 675                         spin_lock_irqsave(&imp->imp_lock, flags);
 676                         list_del_init(&req->rq_list);
 677                         spin_unlock_irqrestore(&imp->imp_lock, flags);
 678
 679                         GOTO(interpret, req->rq_status);
 680                 }
 681
 682                 /* ptlrpc_queue_wait->l_wait_event guarantees that rq_intr
 683                  * will only be set after rq_timedout, but the oig waiting
 684                  * path sets rq_intr irrespective of whether ptlrpcd has
 685                  * seen a timeout.  our policy is to only interpret
 686                  * interrupted rpcs after they have timed out */
 687                 if (req->rq_intr && (req->rq_timedout || req->rq_waiting)) {
 688                         /* NB could be on delayed list */
 689                         ptlrpc_unregister_reply(req);
 690                         req->rq_status = -EINTR;
 691                         req->rq_phase = RQ_PHASE_INTERPRET;
 692
 693                         spin_lock_irqsave(&imp->imp_lock, flags);
 694                         list_del_init(&req->rq_list);
 695                         spin_unlock_irqrestore(&imp->imp_lock, flags);
 696
 697                         GOTO(interpret, req->rq_status);
 698                 }
 699
 700                 if (req->rq_phase == RQ_PHASE_RPC) {
 701                         if (req->rq_timedout||req->rq_waiting||req->rq_resend) {
 702                                 int status;
 703
 704                                 ptlrpc_unregister_reply(req);
 705
 706                                 spin_lock_irqsave(&imp->imp_lock, flags);
 707
 708                                 if (ptlrpc_import_delay_req(imp, req, &status)){
 709                                         spin_unlock_irqrestore(&imp->imp_lock,
 710                                                                flags);
 711                                         continue;
 712                                 }
 713
 714                                 list_del_init(&req->rq_list);
 715                                 if (status != 0)  {
 716                                         req->rq_status = status;
 717                                         req->rq_phase = RQ_PHASE_INTERPRET;
 718                                         spin_unlock_irqrestore(&imp->imp_lock,
 719                                                                flags);
 720                                         GOTO(interpret, req->rq_status);
 721                                 }
 722                                 if (req->rq_no_resend) {
 723                                         req->rq_status = -ENOTCONN;
 724                                         req->rq_phase = RQ_PHASE_INTERPRET;
 725                                         spin_unlock_irqrestore(&imp->imp_lock,
 726                                                                flags);
 727                                         GOTO(interpret, req->rq_status);
 728                                 }
 729                                 list_add_tail(&req->rq_list,
 730                                               &imp->imp_sending_list);
 731
 732                                 spin_unlock_irqrestore(&imp->imp_lock, flags);
 733
 734                                 req->rq_waiting = 0;
 735                                 if (req->rq_resend) {
 736                                         if (!req->rq_ptlrpcs_restart)
 737                                                 lustre_msg_add_flags(
 738                                                         req->rq_reqmsg,
 739                                                         MSG_RESENT);
 740                                         if (req->rq_bulk) {
 741                                                 __u64 old_xid = req->rq_xid;
 742
 743                                                 ptlrpc_unregister_bulk (req);
 744
 745                                                 /* ensure previous bulk fails */
 746                                                 req->rq_xid = ptlrpc_next_xid();
 747                                                 CDEBUG(D_HA, "resend bulk "
 748                                                        "old x"LPU64
 749                                                        " new x"LPU64"\n",
 750                                                        old_xid, req->rq_xid);
 751                                         }
 752                                 }
 753
 754                                 rc = ptl_send_rpc(req);
 755                                 if (rc) {
 756                                         DEBUG_REQ(D_HA, req, "send failed (%d)",
 757                                                   rc);
 758                                         force_timer_recalc = 1;
 759                                         req->rq_net_err = 1;
 760                                 }
 761                                 /* need to reset the timeout */
 762                                 force_timer_recalc = 1;
 763                         }
 764
 765                         /* Still waiting for a reply? */
 766                         if (ptlrpc_client_receiving_reply(req))
 767                                 continue;
 768
 769                         /* Did we actually receive a reply? */
 770                         if (!ptlrpc_client_replied(req))
 771                                 continue;
 772
 773                         spin_lock_irqsave(&imp->imp_lock, flags);
 774                         list_del_init(&req->rq_list);
 775                         spin_unlock_irqrestore(&imp->imp_lock, flags);
 776
 777                         req->rq_status = after_reply(req);
 778                         if (req->rq_resend) {
 779                                 /* Add this req to the delayed list so
 780                                    it can be errored if the import is
 781                                    evicted after recovery. */
 782                                 spin_lock_irqsave (&req->rq_lock, flags);
 783                                 list_add_tail(&req->rq_list,
 784                                               &imp->imp_delayed_list);
 785                                 spin_unlock_irqrestore(&req->rq_lock, flags);
 786                                 continue;
 787                         }
 788
 789                         /* If there is no bulk associated with this request,
 790                          * then we're done and should let the interpreter
 791                          * process the reply.  Similarly if the RPC returned
 792                          * an error, and therefore the bulk will never arrive.
 793                          */
 794                         if (req->rq_bulk == NULL || req->rq_status != 0) {
 795                                 req->rq_phase = RQ_PHASE_INTERPRET;
 796                                 GOTO(interpret, req->rq_status);
 797                         }
 798
 799                         req->rq_phase = RQ_PHASE_BULK;
 800                 }
 801
 802                 LASSERT(req->rq_phase == RQ_PHASE_BULK);
 803                 if (ptlrpc_bulk_active(req->rq_bulk))
 804                         continue;
 805
 806                 if (!req->rq_bulk->bd_success) {
 807                         /* The RPC reply arrived OK, but the bulk screwed
 808                          * up!  Dead wierd since the server told us the RPC
 809                          * was good after getting the REPLY for her GET or
 810                          * the ACK for her PUT. */
 811                         DEBUG_REQ(D_ERROR, req, "bulk transfer failed");
 812                         LBUG();
 813                 }
 814
 815                 req->rq_phase = RQ_PHASE_INTERPRET;
 816
 817         interpret:
 818                 LASSERT(req->rq_phase == RQ_PHASE_INTERPRET);
 819                 LASSERT(!req->rq_receiving_reply);
 820
 821                 ptlrpc_unregister_reply(req);
 822                 if (req->rq_bulk != NULL)
 823                         ptlrpc_unregister_bulk (req);
 824
 825                 req->rq_phase = RQ_PHASE_COMPLETE;
 826
 827                 if (req->rq_interpret_reply != NULL) {
 828                         int (*interpreter)(struct ptlrpc_request *,void *,int) =
 829                                 req->rq_interpret_reply;
 830                         req->rq_status = interpreter(req, &req->rq_async_args,
 831                                                      req->rq_status);
 832                 }
 833
 834                 CDEBUG(D_RPCTRACE, "Completed RPC pname:cluuid:pid:xid:ni:nid:"
 835                        "opc %s:%s:%d:"LPU64":%s:%s:%d\n", current->comm,
 836                        imp->imp_obd->obd_uuid.uuid, req->rq_reqmsg->status,
 837                        req->rq_xid,
 838                        imp->imp_connection->c_peer.peer_ni->pni_name,
 839                        ptlrpc_peernid2str(&imp->imp_connection->c_peer, str),
 840                        req->rq_reqmsg->opc);
 841
 842                 set->set_remaining--;
 843
 844                 atomic_dec(&imp->imp_inflight);
 845                 wake_up(&imp->imp_recovery_waitq);
 846         }
 847
 848         /* If we hit an error, we want to recover promptly. */
 849         RETURN(set->set_remaining == 0 || force_timer_recalc);
 850 }
 851
 852 int ptlrpc_expire_one_request(struct ptlrpc_request *req)
 853 {
 854         unsigned long      flags;
 855         struct obd_import *imp = req->rq_import;
 856         int replied = 0;
 857         ENTRY;
 858
 859         DEBUG_REQ(D_ERROR, req, "timeout (sent at %lu, %lus ago)",
 860                   (long)req->rq_sent, LTIME_S(CURRENT_TIME) - req->rq_sent);
 861
 862         spin_lock_irqsave (&req->rq_lock, flags);
 863         replied = req->rq_replied;
 864         if (!replied)
 865                 req->rq_timedout = 1;
 866         spin_unlock_irqrestore (&req->rq_lock, flags);
 867
 868         if (replied)
 869                 RETURN(0);
 870
 871         DEBUG_REQ(D_ERROR, req, "timeout (sent at %lu)", (long)req->rq_sent);
 872
 873         ptlrpc_unregister_reply (req);
 874
 875         if (obd_dump_on_timeout)
 876                 portals_debug_dumplog();
 877
 878         if (req->rq_bulk != NULL)
 879                 ptlrpc_unregister_bulk (req);
 880
 881         if (imp == NULL) {
 882                 DEBUG_REQ(D_HA, req, "NULL import: already cleaned up?");
 883                 RETURN(1);
 884         }
 885
 886         /* The DLM server doesn't want recovery run on its imports. */
 887         if (imp->imp_dlm_fake)
 888                 RETURN(1);
 889
 890         /* If this request is for recovery or other primordial tasks,
 891          * then error it out here. */
 892         if (req->rq_send_state != LUSTRE_IMP_FULL ||
 893             imp->imp_obd->obd_no_recov) {
 894                 spin_lock_irqsave (&req->rq_lock, flags);
 895                 req->rq_status = -ETIMEDOUT;
 896                 req->rq_err = 1;
 897                 spin_unlock_irqrestore (&req->rq_lock, flags);
 898                 RETURN(1);
 899         }
 900
 901         ptlrpc_fail_import(imp, req->rq_import_generation);
 902
 903         RETURN(0);
 904 }
 905
 906 int ptlrpc_expired_set(void *data)
 907 {
 908         struct ptlrpc_request_set *set = data;
 909         struct list_head          *tmp;
 910         time_t                     now = LTIME_S(CURRENT_TIME);
 911         ENTRY;
 912
 913         LASSERT(set != NULL);
 914
 915         /* A timeout expired; see which reqs it applies to... */
 916         list_for_each (tmp, &set->set_requests) {
 917                 struct ptlrpc_request *req =
 918                         list_entry(tmp, struct ptlrpc_request, rq_set_chain);
 919
 920                 /* request in-flight? */
 921                 if (!((req->rq_phase == RQ_PHASE_RPC && !req->rq_waiting
 922                        && !req->rq_resend) ||
 923                       (req->rq_phase == RQ_PHASE_BULK)))
 924                         continue;
 925
 926                 if (req->rq_timedout ||           /* already dealt with */
 927                     req->rq_sent + req->rq_timeout > now) /* not expired */
 928                         continue;
 929
 930                 /* deal with this guy */
 931                 ptlrpc_expire_one_request (req);
 932         }
 933
 934         /* When waiting for a whole set, we always to break out of the
 935          * sleep so we can recalculate the timeout, or enable interrupts
 936          * iff everyone's timed out.
 937          */
 938         RETURN(1);
 939 }
 940
 941 void ptlrpc_mark_interrupted(struct ptlrpc_request *req)
 942 {
 943         unsigned long flags;
 944         spin_lock_irqsave(&req->rq_lock, flags);
 945         req->rq_intr = 1;
 946         spin_unlock_irqrestore(&req->rq_lock, flags);
 947 }
 948
 949 void ptlrpc_interrupted_set(void *data)
 950 {
 951         struct ptlrpc_request_set *set = data;
 952         struct list_head *tmp;
 953
 954         LASSERT(set != NULL);
 955         CERROR("INTERRUPTED SET %p\n", set);
 956
 957         list_for_each(tmp, &set->set_requests) {
 958                 struct ptlrpc_request *req =
 959                         list_entry(tmp, struct ptlrpc_request, rq_set_chain);
 960
 961                 if (req->rq_phase != RQ_PHASE_RPC)
 962                         continue;
 963
 964                 ptlrpc_mark_interrupted(req);
 965         }
 966 }
 967
 968 int ptlrpc_set_next_timeout(struct ptlrpc_request_set *set)
 969 {
 970         struct list_head      *tmp;
 971         time_t                 now = LTIME_S(CURRENT_TIME);
 972         time_t                 deadline;
 973         int                    timeout = 0;
 974         struct ptlrpc_request *req;
 975         ENTRY;
 976
 977         SIGNAL_MASK_ASSERT(); /* XXX BUG 1511 */
 978
 979         list_for_each(tmp, &set->set_requests) {
 980                 req = list_entry(tmp, struct ptlrpc_request, rq_set_chain);
 981
 982                 /* request in-flight? */
 983                 if (!((req->rq_phase == RQ_PHASE_RPC && !req->rq_waiting) ||
 984                       (req->rq_phase == RQ_PHASE_BULK)))
 985                         continue;
 986
 987                 if (req->rq_timedout)   /* already timed out */
 988                         continue;
 989
 990                 deadline = req->rq_sent + req->rq_timeout;
 991                 if (deadline <= now)    /* actually expired already */
 992                         timeout = 1;    /* ASAP */
 993                 else if (timeout == 0 || timeout > deadline - now)
 994                         timeout = deadline - now;
 995         }
 996         RETURN(timeout);
 997 }
 998
 999
1000 int ptlrpc_set_wait(struct ptlrpc_request_set *set)
1001 {
1002         struct list_head      *tmp;
1003         struct ptlrpc_request *req;
1004         struct l_wait_info     lwi;
1005         int                    rc, timeout;
1006         ENTRY;
1007
1008         LASSERT(!list_empty(&set->set_requests));
1009         list_for_each(tmp, &set->set_requests) {
1010                 req = list_entry(tmp, struct ptlrpc_request, rq_set_chain);
1011                 if (req->rq_phase == RQ_PHASE_NEW)
1012                         (void)ptlrpc_send_new_req(req);
1013         }
1014
1015         do {
1016                 timeout = ptlrpc_set_next_timeout(set);
1017
1018                 /* wait until all complete, interrupted, or an in-flight
1019                  * req times out */
1020                 CDEBUG(D_HA, "set %p going to sleep for %d seconds\n",
1021                        set, timeout);
1022                 lwi = LWI_TIMEOUT_INTR((timeout ? timeout : 1) * HZ,
1023                                        ptlrpc_expired_set,
1024                                        ptlrpc_interrupted_set, set);
1025                 rc = l_wait_event(set->set_waitq, ptlrpc_check_set(set), &lwi);
1026
1027                 LASSERT(rc == 0 || rc == -EINTR || rc == -ETIMEDOUT);
1028
1029                 /* -EINTR => all requests have been flagged rq_intr so next
1030                  * check completes.
1031                  * -ETIMEOUTD => someone timed out.  When all reqs have
1032                  * timed out, signals are enabled allowing completion with
1033                  * EINTR.
1034                  * I don't really care if we go once more round the loop in
1035                  * the error cases -eeb. */
1036         } while (rc != 0 || set->set_remaining != 0);
1037
1038         LASSERT(set->set_remaining == 0);
1039
1040         rc = 0;
1041         list_for_each(tmp, &set->set_requests) {
1042                 req = list_entry(tmp, struct ptlrpc_request, rq_set_chain);
1043
1044                 LASSERT(req->rq_phase == RQ_PHASE_COMPLETE);
1045                 if (req->rq_status != 0)
1046                         rc = req->rq_status;
1047         }
1048
1049         if (set->set_interpret != NULL) {
1050                 int (*interpreter)(struct ptlrpc_request_set *set,void *,int) =
1051                         set->set_interpret;
1052                 rc = interpreter (set, set->set_arg, rc);
1053         }
1054
1055         RETURN(rc);
1056 }
1057
1058 static void __ptlrpc_free_req(struct ptlrpc_request *request, int locked)
1059 {
1060         ENTRY;
1061         if (request == NULL) {
1062                 EXIT;
1063                 return;
1064         }
1065
1066         LASSERTF(!request->rq_receiving_reply, "req %p\n", request);
1067         LASSERTF(request->rq_rqbd == NULL, "req %p\n",request);/* client-side */
1068         LASSERTF(list_empty(&request->rq_list), "req %p\n", request);
1069         LASSERTF(list_empty(&request->rq_set_chain), "req %p\n", request);
1070         LASSERT(request->rq_cred);
1071
1072         /* We must take it off the imp_replay_list first.  Otherwise, we'll set
1073          * request->rq_reqmsg to NULL while osc_close is dereferencing it. */
1074         if (request->rq_import != NULL) {
1075                 unsigned long flags = 0;
1076                 if (!locked)
1077                         spin_lock_irqsave(&request->rq_import->imp_lock, flags);
1078                 list_del_init(&request->rq_replay_list);
1079                 if (!locked)
1080                         spin_unlock_irqrestore(&request->rq_import->imp_lock,
1081                                                flags);
1082         }
1083         LASSERTF(list_empty(&request->rq_replay_list), "req %p\n", request);
1084
1085         if (atomic_read(&request->rq_refcount) != 0) {
1086                 DEBUG_REQ(D_ERROR, request,
1087                           "freeing request with nonzero refcount");
1088                 LBUG();
1089         }
1090
1091         if (request->rq_repbuf != NULL)
1092                 ptlrpcs_cli_free_repbuf(request);
1093         if (request->rq_reqbuf != NULL)
1094                 ptlrpcs_cli_free_reqbuf(request);
1095
1096         if (request->rq_export != NULL) {
1097                 class_export_put(request->rq_export);
1098                 request->rq_export = NULL;
1099         }
1100         if (request->rq_import != NULL) {
1101                 class_import_put(request->rq_import);
1102                 request->rq_import = NULL;
1103         }
1104         if (request->rq_bulk != NULL)
1105                 ptlrpc_free_bulk(request->rq_bulk);
1106
1107         ptlrpcs_req_drop_cred(request);
1108         OBD_FREE(request, sizeof(*request));
1109         EXIT;
1110 }
1111
1112 void ptlrpc_free_req(struct ptlrpc_request *request)
1113 {
1114         __ptlrpc_free_req(request, 0);
1115 }
1116
1117 static int __ptlrpc_req_finished(struct ptlrpc_request *request, int locked);
1118 void ptlrpc_req_finished_with_imp_lock(struct ptlrpc_request *request)
1119 {
1120         LASSERT_SPIN_LOCKED(&request->rq_import->imp_lock);
1121         (void)__ptlrpc_req_finished(request, 1);
1122 }
1123
1124 static int __ptlrpc_req_finished(struct ptlrpc_request *request, int locked)
1125 {
1126         ENTRY;
1127         if (request == NULL)
1128                 RETURN(1);
1129
1130         if (request == LP_POISON ||
1131             request->rq_reqmsg == LP_POISON) {
1132                 CERROR("dereferencing freed request (bug 575)\n");
1133                 LBUG();
1134                 RETURN(1);
1135         }
1136
1137         DEBUG_REQ(D_INFO, request, "refcount now %u",
1138                   atomic_read(&request->rq_refcount) - 1);
1139
1140         if (atomic_dec_and_test(&request->rq_refcount)) {
1141                 __ptlrpc_free_req(request, locked);
1142                 RETURN(1);
1143         }
1144
1145         RETURN(0);
1146 }
1147
1148 void ptlrpc_req_finished(struct ptlrpc_request *request)
1149 {
1150         __ptlrpc_req_finished(request, 0);
1151 }
1152
1153 /* Disengage the client's reply buffer from the network
1154  * NB does _NOT_ unregister any client-side bulk.
1155  * IDEMPOTENT, but _not_ safe against concurrent callers.
1156  * The request owner (i.e. the thread doing the I/O) must call...
1157  */
1158 void ptlrpc_unregister_reply (struct ptlrpc_request *request)
1159 {
1160         int                rc;
1161         wait_queue_head_t *wq;
1162         struct l_wait_info lwi;
1163
1164         LASSERT(!in_interrupt ());             /* might sleep */
1165
1166         if (!ptlrpc_client_receiving_reply(request))
1167                 return;
1168
1169         PtlMDUnlink (request->rq_reply_md_h);
1170
1171         /* We have to l_wait_event() whatever the result, to give liblustre
1172          * a chance to run reply_in_callback() */
1173
1174         if (request->rq_set != NULL)
1175                 wq = &request->rq_set->set_waitq;
1176         else
1177                 wq = &request->rq_reply_waitq;
1178
1179         for (;;) {
1180                 /* Network access will complete in finite time but the HUGE
1181                  * timeout lets us CWARN for visibility of sluggish NALs */
1182                 lwi = LWI_TIMEOUT(300 * HZ, NULL, NULL);
1183                 rc = l_wait_event (*wq, !ptlrpc_client_receiving_reply(request), &lwi);
1184                 if (rc == 0)
1185                         return;
1186
1187                 LASSERT (rc == -ETIMEDOUT);
1188                 DEBUG_REQ(D_WARNING, request, "Unexpectedly long timeout");
1189         }
1190 }
1191
1192 /* caller must hold imp->imp_lock */
1193 void ptlrpc_free_committed(struct obd_import *imp)
1194 {
1195         struct list_head *tmp, *saved;
1196         struct ptlrpc_request *req;
1197         struct ptlrpc_request *last_req = NULL; /* temporary fire escape */
1198         ENTRY;
1199
1200         LASSERT(imp != NULL);
1201
1202         LASSERT_SPIN_LOCKED(&imp->imp_lock);
1203
1204         CDEBUG(D_HA, "%s: committing for last_committed "LPU64"\n",
1205                imp->imp_obd->obd_name, imp->imp_peer_committed_transno);
1206
1207         list_for_each_safe(tmp, saved, &imp->imp_replay_list) {
1208                 req = list_entry(tmp, struct ptlrpc_request, rq_replay_list);
1209
1210                 /* XXX ok to remove when 1357 resolved - rread 05/29/03  */
1211                 LASSERT(req != last_req);
1212                 last_req = req;
1213
1214                 if (req->rq_import_generation < imp->imp_generation) {
1215                         DEBUG_REQ(D_HA, req, "freeing request with old gen");
1216                         GOTO(free_req, 0);
1217                 }
1218
1219                 if (req->rq_replay) {
1220                         DEBUG_REQ(D_HA, req, "keeping (FL_REPLAY)");
1221                         continue;
1222                 }
1223
1224                 /* not yet committed */
1225                 if (req->rq_transno > imp->imp_peer_committed_transno) {
1226                         DEBUG_REQ(D_HA, req, "stopping search");
1227                         break;
1228                 }
1229
1230                 DEBUG_REQ(D_HA, req, "committing (last_committed "LPU64")",
1231                           imp->imp_peer_committed_transno);
1232 free_req:
1233                 if (req->rq_commit_cb != NULL)
1234                         req->rq_commit_cb(req);
1235                 list_del_init(&req->rq_replay_list);
1236                 __ptlrpc_req_finished(req, 1);
1237         }
1238
1239         EXIT;
1240         return;
1241 }
1242
1243 void ptlrpc_cleanup_client(struct obd_import *imp)
1244 {
1245         ENTRY;
1246         EXIT;
1247         return;
1248 }
1249
1250 void ptlrpc_resend_req(struct ptlrpc_request *req)
1251 {
1252         unsigned long flags;
1253
1254         DEBUG_REQ(D_HA, req, "going to resend");
1255         req->rq_reqmsg->handle.cookie = 0;
1256         req->rq_status = -EAGAIN;
1257
1258         spin_lock_irqsave (&req->rq_lock, flags);
1259         req->rq_resend = 1;
1260         req->rq_net_err = 0;
1261         req->rq_timedout = 0;
1262         if (req->rq_bulk) {
1263                 __u64 old_xid = req->rq_xid;
1264
1265                 /* ensure previous bulk fails */
1266                 req->rq_xid = ptlrpc_next_xid();
1267                 CDEBUG(D_HA, "resend bulk old x"LPU64" new x"LPU64"\n",
1268                        old_xid, req->rq_xid);
1269         }
1270         ptlrpc_wake_client_req(req);
1271         spin_unlock_irqrestore (&req->rq_lock, flags);
1272 }
1273
1274 /* XXX: this function and rq_status are currently unused */
1275 void ptlrpc_restart_req(struct ptlrpc_request *req)
1276 {
1277         unsigned long flags;
1278
1279         DEBUG_REQ(D_HA, req, "restarting (possibly-)completed request");
1280         req->rq_status = -ERESTARTSYS;
1281
1282         spin_lock_irqsave (&req->rq_lock, flags);
1283         req->rq_restart = 1;
1284         req->rq_timedout = 0;
1285         ptlrpc_wake_client_req(req);
1286         spin_unlock_irqrestore (&req->rq_lock, flags);
1287 }
1288
1289 static int expired_request(void *data)
1290 {
1291         struct ptlrpc_request *req = data;
1292         ENTRY;
1293
1294         RETURN(ptlrpc_expire_one_request(req));
1295 }
1296
1297 static void interrupted_request(void *data)
1298 {
1299         unsigned long flags;
1300
1301         struct ptlrpc_request *req = data;
1302         DEBUG_REQ(D_HA, req, "request interrupted");
1303         spin_lock_irqsave (&req->rq_lock, flags);
1304         req->rq_intr = 1;
1305         spin_unlock_irqrestore (&req->rq_lock, flags);
1306 }
1307
1308 struct ptlrpc_request *ptlrpc_request_addref(struct ptlrpc_request *req)
1309 {
1310         ENTRY;
1311         atomic_inc(&req->rq_refcount);
1312         RETURN(req);
1313 }
1314
1315 void ptlrpc_retain_replayable_request(struct ptlrpc_request *req,
1316                                       struct obd_import *imp)
1317 {
1318         struct list_head *tmp;
1319
1320         LASSERT_SPIN_LOCKED(&imp->imp_lock);
1321
1322         /* clear this  for new requests that were resent as well
1323            as resent replayed requests. */
1324         lustre_msg_clear_flags(req->rq_reqmsg, MSG_RESENT);
1325
1326         /* don't re-add requests that have been replayed */
1327         if (!list_empty(&req->rq_replay_list))
1328                 return;
1329
1330         lustre_msg_add_flags(req->rq_reqmsg, MSG_REPLAY);
1331
1332         LASSERT(imp->imp_replayable);
1333         /* Balanced in ptlrpc_free_committed, usually. */
1334         ptlrpc_request_addref(req);
1335         list_for_each_prev(tmp, &imp->imp_replay_list) {
1336                 struct ptlrpc_request *iter =
1337                         list_entry(tmp, struct ptlrpc_request, rq_replay_list);
1338
1339                 /* We may have duplicate transnos if we create and then
1340                  * open a file, or for closes retained if to match creating
1341                  * opens, so use req->rq_xid as a secondary key.
1342                  * (See bugs 684, 685, and 428.)
1343                  * XXX no longer needed, but all opens need transnos!
1344                  */
1345                 if (iter->rq_transno > req->rq_transno)
1346                         continue;
1347
1348                 if (iter->rq_transno == req->rq_transno) {
1349                         LASSERT(iter->rq_xid != req->rq_xid);
1350                         if (iter->rq_xid > req->rq_xid)
1351                                 continue;
1352                 }
1353
1354                 list_add(&req->rq_replay_list, &iter->rq_replay_list);
1355                 return;
1356         }
1357
1358         list_add_tail(&req->rq_replay_list, &imp->imp_replay_list);
1359 }
1360
1361 int ptlrpc_queue_wait(struct ptlrpc_request *req)
1362 {
1363         char str[PTL_NALFMT_SIZE];
1364         int rc = 0;
1365         int brc;
1366         struct l_wait_info lwi;
1367         struct obd_import *imp = req->rq_import;
1368         unsigned long flags;
1369         int timeout = 0;
1370         ENTRY;
1371
1372         LASSERT(req->rq_set == NULL);
1373         LASSERT(!req->rq_receiving_reply);
1374         atomic_inc(&imp->imp_inflight);
1375
1376         if (imp->imp_connection == NULL) {
1377                 CERROR("request on not connected import %s\n",
1378                         imp->imp_obd->obd_name);
1379                 RETURN(-EINVAL);
1380         }
1381
1382         /* for distributed debugging */
1383         req->rq_reqmsg->status = current->pid;
1384         LASSERT(imp->imp_obd != NULL);
1385         CDEBUG(D_RPCTRACE, "Sending RPC pname:cluuid:pid:xid:ni:nid:opc "
1386                "%s:%s:%d:"LPU64":%s:%s:%d\n", current->comm,
1387                imp->imp_obd->obd_uuid.uuid,
1388                req->rq_reqmsg->status, req->rq_xid,
1389                imp->imp_connection->c_peer.peer_ni->pni_name,
1390                ptlrpc_peernid2str(&imp->imp_connection->c_peer, str),
1391                req->rq_reqmsg->opc);
1392
1393         /* Mark phase here for a little debug help */
1394         req->rq_phase = RQ_PHASE_RPC;
1395
1396         spin_lock_irqsave(&imp->imp_lock, flags);
1397         req->rq_import_generation = imp->imp_generation;
1398 restart:
1399         if (ptlrpc_import_delay_req(imp, req, &rc)) {
1400                 list_del(&req->rq_list);
1401
1402                 list_add_tail(&req->rq_list, &imp->imp_delayed_list);
1403                 spin_unlock_irqrestore(&imp->imp_lock, flags);
1404
1405                 DEBUG_REQ(D_HA, req, "\"%s\" waiting for recovery: (%s != %s)",
1406                           current->comm,
1407                           ptlrpc_import_state_name(req->rq_send_state),
1408                           ptlrpc_import_state_name(imp->imp_state));
1409                 lwi = LWI_INTR(interrupted_request, req);
1410                 rc = l_wait_event(req->rq_reply_waitq,
1411                                   (req->rq_send_state == imp->imp_state ||
1412                                    req->rq_err),
1413                                   &lwi);
1414                 DEBUG_REQ(D_HA, req, "\"%s\" awake: (%s == %s or %d == 1)",
1415                           current->comm,
1416                           ptlrpc_import_state_name(imp->imp_state),
1417                           ptlrpc_import_state_name(req->rq_send_state),
1418                           req->rq_err);
1419
1420                 spin_lock_irqsave(&imp->imp_lock, flags);
1421                 list_del_init(&req->rq_list);
1422
1423                 if (req->rq_err) {
1424                         rc = -EIO;
1425                 }
1426                 else if (req->rq_intr) {
1427                         rc = -EINTR;
1428                 }
1429                 else if (req->rq_no_resend) {
1430                         spin_unlock_irqrestore(&imp->imp_lock, flags);
1431                         GOTO(out, rc = -ETIMEDOUT);
1432                 }
1433                 else {
1434                         GOTO(restart, rc);
1435                 }
1436         }
1437
1438         if (rc != 0) {
1439                 list_del_init(&req->rq_list);
1440                 spin_unlock_irqrestore(&imp->imp_lock, flags);
1441                 req->rq_status = rc; // XXX this ok?
1442                 GOTO(out, rc);
1443         }
1444
1445         if (req->rq_resend) {
1446                 if (!req->rq_ptlrpcs_restart)
1447                         lustre_msg_add_flags(req->rq_reqmsg, MSG_RESENT);
1448
1449                 if (req->rq_bulk != NULL)
1450                         ptlrpc_unregister_bulk (req);
1451
1452                 DEBUG_REQ(D_HA, req, "resending: ");
1453         }
1454
1455         /* XXX this is the same as ptlrpc_set_wait */
1456         LASSERT(list_empty(&req->rq_list));
1457         list_add_tail(&req->rq_list, &imp->imp_sending_list);
1458         spin_unlock_irqrestore(&imp->imp_lock, flags);
1459
1460         rc = ptl_send_rpc(req);
1461         if (rc) {
1462                 DEBUG_REQ(D_HA, req, "send failed (%d); recovering", rc);
1463                 timeout = 1;
1464         } else {
1465                 timeout = MAX(req->rq_timeout * HZ, 1);
1466                 DEBUG_REQ(D_NET, req, "-- sleeping for %d jiffies", timeout);
1467         }
1468         lwi = LWI_TIMEOUT_INTR(timeout, expired_request, interrupted_request,
1469                                req);
1470         l_wait_event(req->rq_reply_waitq, ptlrpc_check_reply(req), &lwi);
1471         DEBUG_REQ(D_NET, req, "-- done sleeping");
1472
1473         CDEBUG(D_RPCTRACE, "Completed RPC pname:cluuid:pid:xid:ni:nid:opc "
1474                "%s:%s:%d:"LPU64":%s:%s:%d\n", current->comm,
1475                imp->imp_obd->obd_uuid.uuid,
1476                req->rq_reqmsg->status, req->rq_xid,
1477                imp->imp_connection->c_peer.peer_ni->pni_name,
1478                ptlrpc_peernid2str(&imp->imp_connection->c_peer, str),
1479                req->rq_reqmsg->opc);
1480
1481         spin_lock_irqsave(&imp->imp_lock, flags);
1482         list_del_init(&req->rq_list);
1483         spin_unlock_irqrestore(&imp->imp_lock, flags);
1484
1485         /* If the reply was received normally, this just grabs the spinlock
1486          * (ensuring the reply callback has returned), sees that
1487          * req->rq_receiving_reply is clear and returns. */
1488         ptlrpc_unregister_reply (req);
1489
1490         if (req->rq_err)
1491                 GOTO(out, rc = -EIO);
1492
1493         /* Resend if we need to, unless we were interrupted. */
1494         if (req->rq_resend && !req->rq_intr) {
1495                 /* ...unless we were specifically told otherwise. */
1496                 if (req->rq_no_resend)
1497                         GOTO(out, rc = -ETIMEDOUT);
1498                 spin_lock_irqsave(&imp->imp_lock, flags);
1499                 goto restart;
1500         }
1501
1502         if (req->rq_intr) {
1503                 /* Should only be interrupted if we timed out. */
1504                 if (!req->rq_timedout)
1505                         DEBUG_REQ(D_ERROR, req,
1506                                   "rq_intr set but rq_timedout not");
1507                 GOTO(out, rc = -EINTR);
1508         }
1509
1510         if (req->rq_timedout) {                 /* non-recoverable timeout */
1511                 GOTO(out, rc = -ETIMEDOUT);
1512         }
1513
1514         if (!req->rq_replied) {
1515                 /* How can this be? -eeb */
1516                 DEBUG_REQ(D_ERROR, req, "!rq_replied: ");
1517                 LBUG();
1518                 GOTO(out, rc = req->rq_status);
1519         }
1520
1521         rc = after_reply (req);
1522         /* NB may return +ve success rc */
1523         if (req->rq_resend) {
1524                 spin_lock_irqsave(&imp->imp_lock, flags);
1525                 goto restart;
1526         }
1527
1528  out:
1529         if (req->rq_bulk != NULL) {
1530                 if (rc >= 0) {
1531                         /* success so far.  Note that anything going wrong
1532                          * with bulk now, is EXTREMELY strange, since the
1533                          * server must have believed that the bulk
1534                          * tranferred OK before she replied with success to
1535                          * me. */
1536                         lwi = LWI_TIMEOUT(timeout, NULL, NULL);
1537                         brc = l_wait_event(req->rq_reply_waitq,
1538                                            !ptlrpc_bulk_active(req->rq_bulk),
1539                                            &lwi);
1540                         LASSERT(brc == 0 || brc == -ETIMEDOUT);
1541                         if (brc != 0) {
1542                                 LASSERT(brc == -ETIMEDOUT);
1543                                 DEBUG_REQ(D_ERROR, req, "bulk timed out");
1544                                 rc = brc;
1545                         } else if (!req->rq_bulk->bd_success) {
1546                                 DEBUG_REQ(D_ERROR, req, "bulk transfer failed");
1547                                 rc = -EIO;
1548                         }
1549                 }
1550                 if (rc < 0)
1551                         ptlrpc_unregister_bulk (req);
1552         }
1553
1554         LASSERT(!req->rq_receiving_reply);
1555         req->rq_phase = RQ_PHASE_INTERPRET;
1556
1557         atomic_dec(&imp->imp_inflight);
1558         wake_up(&imp->imp_recovery_waitq);
1559         RETURN(rc);
1560 }
1561
1562 struct ptlrpc_replay_async_args {
1563         int praa_old_state;
1564         int praa_old_status;
1565 };
1566
1567 static int ptlrpc_replay_interpret(struct ptlrpc_request *req,
1568                                     void * data, int rc)
1569 {
1570         struct ptlrpc_replay_async_args *aa = data;
1571         struct obd_import *imp = req->rq_import;
1572         unsigned long flags;
1573
1574         atomic_dec(&imp->imp_replay_inflight);
1575
1576         if (!req->rq_replied) {
1577                 CERROR("request replay timed out, restarting recovery\n");
1578                 GOTO(out, rc = -ETIMEDOUT);
1579         }
1580
1581 #if SWAB_PARANOIA
1582         /* Clear reply swab mask; this is a new reply in sender's byte order */
1583         req->rq_rep_swab_mask = 0;
1584 #endif
1585         LASSERT (req->rq_nob_received <= req->rq_repbuf_len);
1586         rc = lustre_unpack_msg(req->rq_repmsg, req->rq_replen);
1587         if (rc) {
1588                 CERROR("unpack_rep failed: %d\n", rc);
1589                 GOTO(out, rc = -EPROTO);
1590         }
1591
1592         if (req->rq_repmsg->type == PTL_RPC_MSG_ERR &&
1593             req->rq_repmsg->status == -ENOTCONN)
1594                 GOTO(out, rc = req->rq_repmsg->status);
1595
1596         /* The transno had better not change over replay. */
1597         LASSERT(req->rq_reqmsg->transno == req->rq_repmsg->transno);
1598
1599         DEBUG_REQ(D_HA, req, "got rep");
1600
1601         /* let the callback do fixups, possibly including in the request */
1602         if (req->rq_replay_cb)
1603                 req->rq_replay_cb(req);
1604
1605         if (req->rq_replied && req->rq_repmsg->status != aa->praa_old_status) {
1606                 DEBUG_REQ(D_ERROR, req, "status %d, old was %d",
1607                           req->rq_repmsg->status, aa->praa_old_status);
1608         } else {
1609                 /* Put it back for re-replay. */
1610                 req->rq_repmsg->status = aa->praa_old_status;
1611         }
1612
1613         spin_lock_irqsave(&imp->imp_lock, flags);
1614         imp->imp_last_replay_transno = req->rq_transno;
1615         spin_unlock_irqrestore(&imp->imp_lock, flags);
1616
1617         /* continue with recovery */
1618         rc = ptlrpc_import_recovery_state_machine(imp);
1619  out:
1620         req->rq_send_state = aa->praa_old_state;
1621
1622         if (rc != 0)
1623                 /* this replay failed, so restart recovery */
1624                 ptlrpc_connect_import(imp, NULL);
1625
1626         RETURN(rc);
1627 }
1628
1629
1630 int ptlrpc_replay_req(struct ptlrpc_request *req)
1631 {
1632         struct ptlrpc_replay_async_args *aa;
1633         ENTRY;
1634
1635         LASSERT(req->rq_import->imp_state == LUSTRE_IMP_REPLAY);
1636
1637         /* Not handling automatic bulk replay yet (or ever?) */
1638         LASSERT(req->rq_bulk == NULL);
1639
1640         DEBUG_REQ(D_HA, req, "REPLAY");
1641
1642         LASSERT (sizeof (*aa) <= sizeof (req->rq_async_args));
1643         aa = (struct ptlrpc_replay_async_args *)&req->rq_async_args;
1644         memset(aa, 0, sizeof *aa);
1645
1646         /* Prepare request to be resent with ptlrpcd */
1647         aa->praa_old_state = req->rq_send_state;
1648         req->rq_send_state = LUSTRE_IMP_REPLAY;
1649         req->rq_phase = RQ_PHASE_NEW;
1650         aa->praa_old_status = req->rq_repmsg->status;
1651         req->rq_status = 0;
1652
1653         req->rq_interpret_reply = ptlrpc_replay_interpret;
1654         atomic_inc(&req->rq_import->imp_replay_inflight);
1655         ptlrpc_request_addref(req); /* ptlrpcd needs a ref */
1656
1657         ptlrpcd_add_req(req);
1658         RETURN(0);
1659 }
1660
1661 void ptlrpc_abort_inflight(struct obd_import *imp)
1662 {
1663         unsigned long flags;
1664         struct list_head *tmp, *n;
1665         ENTRY;
1666
1667         /* Make sure that no new requests get processed for this import.
1668          * ptlrpc_{queue,set}_wait must (and does) hold imp_lock while testing
1669          * this flag and then putting requests on sending_list or delayed_list.
1670          */
1671         spin_lock_irqsave(&imp->imp_lock, flags);
1672
1673         /* XXX locking?  Maybe we should remove each request with the list
1674          * locked?  Also, how do we know if the requests on the list are
1675          * being freed at this time?
1676          */
1677         list_for_each_safe(tmp, n, &imp->imp_sending_list) {
1678                 struct ptlrpc_request *req =
1679                         list_entry(tmp, struct ptlrpc_request, rq_list);
1680
1681                 DEBUG_REQ(D_HA, req, "inflight");
1682
1683                 spin_lock (&req->rq_lock);
1684                 if (req->rq_import_generation < imp->imp_generation) {
1685                         req->rq_err = 1;
1686                         ptlrpc_wake_client_req(req);
1687                 }
1688                 spin_unlock (&req->rq_lock);
1689         }
1690
1691         list_for_each_safe(tmp, n, &imp->imp_delayed_list) {
1692                 struct ptlrpc_request *req =
1693                         list_entry(tmp, struct ptlrpc_request, rq_list);
1694
1695                 DEBUG_REQ(D_HA, req, "aborting waiting req");
1696
1697                 spin_lock (&req->rq_lock);
1698                 if (req->rq_import_generation < imp->imp_generation) {
1699                         req->rq_err = 1;
1700                         ptlrpc_wake_client_req(req);
1701                 }
1702                 spin_unlock (&req->rq_lock);
1703         }
1704
1705         list_for_each_safe(tmp, n, &imp->imp_rawrpc_list) {
1706                 struct ptlrpc_request *req =
1707                         list_entry(tmp, struct ptlrpc_request, rq_list);
1708
1709                 DEBUG_REQ(D_HA, req, "aborting raw rpc");
1710
1711                 spin_lock(&req->rq_lock);
1712                 req->rq_err = 1;
1713                 ptlrpc_wake_client_req(req);
1714                 spin_unlock(&req->rq_lock);
1715         }
1716
1717         /* Last chance to free reqs left on the replay list, but we
1718          * will still leak reqs that haven't comitted.  */
1719         if (imp->imp_replayable)
1720                 ptlrpc_free_committed(imp);
1721
1722         spin_unlock_irqrestore(&imp->imp_lock, flags);
1723
1724         EXIT;
1725 }
1726
1727 static __u64 ptlrpc_last_xid = 0;
1728 static spinlock_t ptlrpc_last_xid_lock = SPIN_LOCK_UNLOCKED;
1729
1730 __u64 ptlrpc_next_xid(void)
1731 {
1732         __u64 tmp;
1733         spin_lock(&ptlrpc_last_xid_lock);
1734         tmp = ++ptlrpc_last_xid;
1735         spin_unlock(&ptlrpc_last_xid_lock);
1736         return tmp;
1737 }
1738
1739