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 the Lustre file system, http://www.lustre.org
   7  *   Lustre is a trademark of Cluster File Systems, Inc.
   8  *
   9  *   You may have signed or agreed to another license before downloading
  10  *   this software.  If so, you are bound by the terms and conditions
  11  *   of that agreement, and the following does not apply to you.  See the
  12  *   LICENSE file included with this distribution for more information.
  13  *
  14  *   If you did not agree to a different license, then this copy of Lustre
  15  *   is open source software; you can redistribute it and/or modify it
  16  *   under the terms of version 2 of the GNU General Public License as
  17  *   published by the Free Software Foundation.
  18  *
  19  *   In either case, Lustre is distributed in the hope that it will be
  20  *   useful, but WITHOUT ANY WARRANTY; without even the implied warranty
  21  *   of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  *   license text for more details.
  23  *
  24  */
  25
  26 #define DEBUG_SUBSYSTEM S_RPC
  27 #ifndef __KERNEL__
  28 #include <errno.h>
  29 #include <signal.h>
  30 #include <liblustre.h>
  31 #endif
  32
  33 #include <obd_support.h>
  34 #include <obd_class.h>
  35 #include <lustre_lib.h>
  36 #include <lustre_ha.h>
  37 #include <lustre_import.h>
  38
  39 #include "ptlrpc_internal.h"
  40
  41 void ptlrpc_init_client(int req_portal, int rep_portal, char *name,
  42                         struct ptlrpc_client *cl)
  43 {
  44         cl->cli_request_portal = req_portal;
  45         cl->cli_reply_portal   = rep_portal;
  46         cl->cli_name           = name;
  47 }
  48
  49 struct ptlrpc_connection *ptlrpc_uuid_to_connection(struct obd_uuid *uuid)
  50 {
  51         struct ptlrpc_connection *c;
  52         lnet_nid_t                self;
  53         lnet_process_id_t         peer;
  54         int                       err;
  55
  56         err = ptlrpc_uuid_to_peer(uuid, &peer, &self);
  57         if (err != 0) {
  58                 CERROR("cannot find peer %s!\n", uuid->uuid);
  59                 return NULL;
  60         }
  61
  62         c = ptlrpc_get_connection(peer, self, uuid);
  63         if (c) {
  64                 memcpy(c->c_remote_uuid.uuid,
  65                        uuid->uuid, sizeof(c->c_remote_uuid.uuid));
  66         }
  67
  68         CDEBUG(D_INFO, "%s -> %p\n", uuid->uuid, c);
  69
  70         return c;
  71 }
  72
  73 void ptlrpc_readdress_connection(struct ptlrpc_connection *conn,
  74                                  struct obd_uuid *uuid)
  75 {
  76         lnet_nid_t        self;
  77         lnet_process_id_t peer;
  78         int               err;
  79
  80         err = ptlrpc_uuid_to_peer(uuid, &peer, &self);
  81         if (err != 0) {
  82                 CERROR("cannot find peer %s!\n", uuid->uuid);
  83                 return;
  84         }
  85
  86         conn->c_peer = peer;
  87         conn->c_self = self;
  88         return;
  89 }
  90
  91 static inline struct ptlrpc_bulk_desc *new_bulk(int npages, int type, int portal)
  92 {
  93         struct ptlrpc_bulk_desc *desc;
  94
  95         OBD_ALLOC(desc, offsetof (struct ptlrpc_bulk_desc, bd_iov[npages]));
  96         if (!desc)
  97                 return NULL;
  98
  99         spin_lock_init(&desc->bd_lock);
 100         cfs_waitq_init(&desc->bd_waitq);
 101         desc->bd_max_iov = npages;
 102         desc->bd_iov_count = 0;
 103         desc->bd_md_h = LNET_INVALID_HANDLE;
 104         desc->bd_portal = portal;
 105         desc->bd_type = type;
 106
 107         return desc;
 108 }
 109
 110 struct ptlrpc_bulk_desc *ptlrpc_prep_bulk_imp (struct ptlrpc_request *req,
 111                                                int npages, int type, int portal)
 112 {
 113         struct obd_import *imp = req->rq_import;
 114         struct ptlrpc_bulk_desc *desc;
 115
 116         ENTRY;
 117         LASSERT(type == BULK_PUT_SINK || type == BULK_GET_SOURCE);
 118         desc = new_bulk(npages, type, portal);
 119         if (desc == NULL)
 120                 RETURN(NULL);
 121
 122         desc->bd_import_generation = req->rq_import_generation;
 123         desc->bd_import = class_import_get(imp);
 124         desc->bd_req = req;
 125
 126         desc->bd_cbid.cbid_fn  = client_bulk_callback;
 127         desc->bd_cbid.cbid_arg = desc;
 128
 129         /* This makes req own desc, and free it when she frees herself */
 130         req->rq_bulk = desc;
 131
 132         return desc;
 133 }
 134
 135 struct ptlrpc_bulk_desc *ptlrpc_prep_bulk_exp (struct ptlrpc_request *req,
 136                                                int npages, int type, int portal)
 137 {
 138         struct obd_export *exp = req->rq_export;
 139         struct ptlrpc_bulk_desc *desc;
 140
 141         ENTRY;
 142         LASSERT(type == BULK_PUT_SOURCE || type == BULK_GET_SINK);
 143
 144         desc = new_bulk(npages, type, portal);
 145         if (desc == NULL)
 146                 RETURN(NULL);
 147
 148         desc->bd_export = class_export_get(exp);
 149         desc->bd_req = req;
 150
 151         desc->bd_cbid.cbid_fn  = server_bulk_callback;
 152         desc->bd_cbid.cbid_arg = desc;
 153
 154         /* NB we don't assign rq_bulk here; server-side requests are
 155          * re-used, and the handler frees the bulk desc explicitly. */
 156
 157         return desc;
 158 }
 159
 160 void ptlrpc_prep_bulk_page(struct ptlrpc_bulk_desc *desc,
 161                            cfs_page_t *page, int pageoffset, int len)
 162 {
 163         LASSERT(desc->bd_iov_count < desc->bd_max_iov);
 164         LASSERT(page != NULL);
 165         LASSERT(pageoffset >= 0);
 166         LASSERT(len > 0);
 167         LASSERT(pageoffset + len <= CFS_PAGE_SIZE);
 168
 169         desc->bd_nob += len;
 170
 171         ptlrpc_add_bulk_page(desc, page, pageoffset, len);
 172 }
 173
 174 void ptlrpc_free_bulk(struct ptlrpc_bulk_desc *desc)
 175 {
 176         ENTRY;
 177
 178         LASSERT(desc != NULL);
 179         LASSERT(desc->bd_iov_count != LI_POISON); /* not freed already */
 180         LASSERT(!desc->bd_network_rw);         /* network hands off or */
 181         LASSERT((desc->bd_export != NULL) ^ (desc->bd_import != NULL));
 182         if (desc->bd_export)
 183                 class_export_put(desc->bd_export);
 184         else
 185                 class_import_put(desc->bd_import);
 186
 187         OBD_FREE(desc, offsetof(struct ptlrpc_bulk_desc,
 188                                 bd_iov[desc->bd_max_iov]));
 189         EXIT;
 190 }
 191
 192 void ptlrpc_free_rq_pool(struct ptlrpc_request_pool *pool)
 193 {
 194         struct list_head *l, *tmp;
 195         struct ptlrpc_request *req;
 196
 197         if (!pool)
 198                 return;
 199
 200         list_for_each_safe(l, tmp, &pool->prp_req_list) {
 201                 req = list_entry(l, struct ptlrpc_request, rq_list);
 202                 list_del(&req->rq_list);
 203                 LASSERT (req->rq_reqmsg);
 204                 OBD_FREE(req->rq_reqmsg, pool->prp_rq_size);
 205                 OBD_FREE(req, sizeof(*req));
 206         }
 207         OBD_FREE(pool, sizeof(*pool));
 208 }
 209
 210 void ptlrpc_add_rqs_to_pool(struct ptlrpc_request_pool *pool, int num_rq)
 211 {
 212         int i;
 213         int size = 1;
 214
 215         while (size < pool->prp_rq_size)
 216                 size <<= 1;
 217
 218         LASSERTF(list_empty(&pool->prp_req_list) || size == pool->prp_rq_size,
 219                  "Trying to change pool size with nonempty pool "
 220                  "from %d to %d bytes\n", pool->prp_rq_size, size);
 221
 222         spin_lock(&pool->prp_lock);
 223         pool->prp_rq_size = size;
 224         for (i = 0; i < num_rq; i++) {
 225                 struct ptlrpc_request *req;
 226                 struct lustre_msg *msg;
 227
 228                 spin_unlock(&pool->prp_lock);
 229                 OBD_ALLOC(req, sizeof(struct ptlrpc_request));
 230                 if (!req)
 231                         return;
 232                 OBD_ALLOC_GFP(msg, size, CFS_ALLOC_STD);
 233                 if (!msg) {
 234                         OBD_FREE(req, sizeof(struct ptlrpc_request));
 235                         return;
 236                 }
 237                 req->rq_reqmsg = msg;
 238                 req->rq_pool = pool;
 239                 spin_lock(&pool->prp_lock);
 240                 list_add_tail(&req->rq_list, &pool->prp_req_list);
 241         }
 242         spin_unlock(&pool->prp_lock);
 243         return;
 244 }
 245
 246 struct ptlrpc_request_pool *ptlrpc_init_rq_pool(int num_rq, int msgsize,
 247                                                 void (*populate_pool)(struct ptlrpc_request_pool *, int))
 248 {
 249         struct ptlrpc_request_pool *pool;
 250
 251         OBD_ALLOC(pool, sizeof (struct ptlrpc_request_pool));
 252         if (!pool)
 253                 return NULL;
 254
 255         /* Request next power of two for the allocation, because internally
 256            kernel would do exactly this */
 257
 258         spin_lock_init(&pool->prp_lock);
 259         CFS_INIT_LIST_HEAD(&pool->prp_req_list);
 260         pool->prp_rq_size = msgsize;
 261         pool->prp_populate = populate_pool;
 262
 263         populate_pool(pool, num_rq);
 264
 265         if (list_empty(&pool->prp_req_list)) {
 266                 /* have not allocated a single request for the pool */
 267                 OBD_FREE(pool, sizeof (struct ptlrpc_request_pool));
 268                 pool = NULL;
 269         }
 270         return pool;
 271 }
 272
 273 static struct ptlrpc_request *ptlrpc_prep_req_from_pool(struct ptlrpc_request_pool *pool)
 274 {
 275         struct ptlrpc_request *request;
 276         struct lustre_msg *reqmsg;
 277
 278         if (!pool)
 279                 return NULL;
 280
 281         spin_lock(&pool->prp_lock);
 282
 283         /* See if we have anything in a pool, and bail out if nothing,
 284          * in writeout path, where this matters, this is safe to do, because
 285          * nothing is lost in this case, and when some in-flight requests
 286          * complete, this code will be called again. */
 287         if (unlikely(list_empty(&pool->prp_req_list))) {
 288                 spin_unlock(&pool->prp_lock);
 289                 return NULL;
 290         }
 291
 292         request = list_entry(pool->prp_req_list.next, struct ptlrpc_request,
 293                              rq_list);
 294         list_del(&request->rq_list);
 295         spin_unlock(&pool->prp_lock);
 296
 297         LASSERT(request->rq_reqmsg);
 298         LASSERT(request->rq_pool);
 299
 300         reqmsg = request->rq_reqmsg;
 301         memset(request, 0, sizeof(*request));
 302         request->rq_reqmsg = reqmsg;
 303         request->rq_pool = pool;
 304         request->rq_reqlen = pool->prp_rq_size;
 305         return request;
 306 }
 307
 308 struct ptlrpc_request *
 309 ptlrpc_prep_req_pool(struct obd_import *imp, __u32 version, int opcode,
 310                      int count, int *lengths, char **bufs,
 311                      struct ptlrpc_request_pool *pool)
 312 {
 313         struct ptlrpc_request *request = NULL;
 314         int rc;
 315         ENTRY;
 316
 317         /* The obd disconnected */
 318         if (imp == NULL)
 319                 return NULL;
 320
 321         LASSERT(imp != LP_POISON);
 322         LASSERT((unsigned long)imp->imp_client > 0x1000);
 323         LASSERT(imp->imp_client != LP_POISON);
 324
 325         if (pool)
 326                 request = ptlrpc_prep_req_from_pool(pool);
 327
 328         if (!request)
 329                 OBD_ALLOC(request, sizeof(*request));
 330
 331         if (!request) {
 332                 CERROR("request allocation out of memory\n");
 333                 RETURN(NULL);
 334         }
 335
 336         rc = lustre_pack_request(request, imp->imp_msg_magic, count, lengths,
 337                                  bufs);
 338         if (rc) {
 339                 LASSERT(!request->rq_pool);
 340                 OBD_FREE(request, sizeof(*request));
 341                 RETURN(NULL);
 342         }
 343
 344         lustre_msg_add_version(request->rq_reqmsg, version);
 345
 346         if (imp->imp_server_timeout)
 347                 request->rq_timeout = obd_timeout / 2;
 348         else
 349                 request->rq_timeout = obd_timeout;
 350         request->rq_send_state = LUSTRE_IMP_FULL;
 351         request->rq_type = PTL_RPC_MSG_REQUEST;
 352         request->rq_import = class_import_get(imp);
 353         request->rq_export = NULL;
 354
 355         request->rq_req_cbid.cbid_fn  = request_out_callback;
 356         request->rq_req_cbid.cbid_arg = request;
 357
 358         request->rq_reply_cbid.cbid_fn  = reply_in_callback;
 359         request->rq_reply_cbid.cbid_arg = request;
 360
 361         request->rq_phase = RQ_PHASE_NEW;
 362
 363         /* XXX FIXME bug 249 */
 364         request->rq_request_portal = imp->imp_client->cli_request_portal;
 365         request->rq_reply_portal = imp->imp_client->cli_reply_portal;
 366
 367         spin_lock_init(&request->rq_lock);
 368         CFS_INIT_LIST_HEAD(&request->rq_list);
 369         CFS_INIT_LIST_HEAD(&request->rq_replay_list);
 370         CFS_INIT_LIST_HEAD(&request->rq_set_chain);
 371         cfs_waitq_init(&request->rq_reply_waitq);
 372         request->rq_xid = ptlrpc_next_xid();
 373         atomic_set(&request->rq_refcount, 1);
 374
 375         lustre_msg_set_opc(request->rq_reqmsg, opcode);
 376         lustre_msg_set_flags(request->rq_reqmsg, 0);
 377
 378         RETURN(request);
 379 }
 380
 381 struct ptlrpc_request *
 382 ptlrpc_prep_req(struct obd_import *imp, __u32 version, int opcode, int count,
 383                 int *lengths, char **bufs)
 384 {
 385         return ptlrpc_prep_req_pool(imp, version, opcode, count, lengths, bufs,
 386                                     NULL);
 387 }
 388
 389 struct ptlrpc_request_set *ptlrpc_prep_set(void)
 390 {
 391         struct ptlrpc_request_set *set;
 392
 393         ENTRY;
 394         OBD_ALLOC(set, sizeof *set);
 395         if (!set)
 396                 RETURN(NULL);
 397         CFS_INIT_LIST_HEAD(&set->set_requests);
 398         cfs_waitq_init(&set->set_waitq);
 399         set->set_remaining = 0;
 400         spin_lock_init(&set->set_new_req_lock);
 401         CFS_INIT_LIST_HEAD(&set->set_new_requests);
 402
 403         RETURN(set);
 404 }
 405
 406 /* Finish with this set; opposite of prep_set. */
 407 void ptlrpc_set_destroy(struct ptlrpc_request_set *set)
 408 {
 409         struct list_head *tmp;
 410         struct list_head *next;
 411         int               expected_phase;
 412         int               n = 0;
 413         ENTRY;
 414
 415         /* Requests on the set should either all be completed, or all be new */
 416         expected_phase = (set->set_remaining == 0) ?
 417                          RQ_PHASE_COMPLETE : RQ_PHASE_NEW;
 418         list_for_each (tmp, &set->set_requests) {
 419                 struct ptlrpc_request *req =
 420                         list_entry(tmp, struct ptlrpc_request, rq_set_chain);
 421
 422                 LASSERT(req->rq_phase == expected_phase);
 423                 n++;
 424         }
 425
 426         LASSERT(set->set_remaining == 0 || set->set_remaining == n);
 427
 428         list_for_each_safe(tmp, next, &set->set_requests) {
 429                 struct ptlrpc_request *req =
 430                         list_entry(tmp, struct ptlrpc_request, rq_set_chain);
 431                 list_del_init(&req->rq_set_chain);
 432
 433                 LASSERT(req->rq_phase == expected_phase);
 434
 435                 if (req->rq_phase == RQ_PHASE_NEW) {
 436
 437                         if (req->rq_interpret_reply != NULL) {
 438                                 int (*interpreter)(struct ptlrpc_request *,
 439                                                    void *, int) =
 440                                         req->rq_interpret_reply;
 441
 442                                 /* higher level (i.e. LOV) failed;
 443                                  * let the sub reqs clean up */
 444                                 req->rq_status = -EBADR;
 445                                 interpreter(req, &req->rq_async_args,
 446                                             req->rq_status);
 447                         }
 448                         set->set_remaining--;
 449                 }
 450
 451                 req->rq_set = NULL;
 452                 ptlrpc_req_finished (req);
 453         }
 454
 455         LASSERT(set->set_remaining == 0);
 456
 457         OBD_FREE(set, sizeof(*set));
 458         EXIT;
 459 }
 460
 461 void ptlrpc_set_add_req(struct ptlrpc_request_set *set,
 462                         struct ptlrpc_request *req)
 463 {
 464         /* The set takes over the caller's request reference */
 465         list_add_tail(&req->rq_set_chain, &set->set_requests);
 466         req->rq_set = set;
 467         set->set_remaining++;
 468
 469         atomic_inc(&req->rq_import->imp_inflight);
 470 }
 471
 472 /* lock so many callers can add things, the context that owns the set
 473  * is supposed to notice these and move them into the set proper. */
 474 void ptlrpc_set_add_new_req(struct ptlrpc_request_set *set,
 475                             struct ptlrpc_request *req)
 476 {
 477         spin_lock(&set->set_new_req_lock);
 478         /* The set takes over the caller's request reference */
 479         list_add_tail(&req->rq_set_chain, &set->set_new_requests);
 480         req->rq_set = set;
 481         spin_unlock(&set->set_new_req_lock);
 482 }
 483
 484 /*
 485  * Based on the current state of the import, determine if the request
 486  * can be sent, is an error, or should be delayed.
 487  *
 488  * Returns true if this request should be delayed. If false, and
 489  * *status is set, then the request can not be sent and *status is the
 490  * error code.  If false and status is 0, then request can be sent.
 491  *
 492  * The imp->imp_lock must be held.
 493  */
 494 static int ptlrpc_import_delay_req(struct obd_import *imp,
 495                                    struct ptlrpc_request *req, int *status)
 496 {
 497         int delay = 0;
 498         ENTRY;
 499
 500         LASSERT (status != NULL);
 501         *status = 0;
 502
 503         if (imp->imp_state == LUSTRE_IMP_NEW) {
 504                 DEBUG_REQ(D_ERROR, req, "Uninitialized import.");
 505                 *status = -EIO;
 506                 LBUG();
 507         } else if (imp->imp_state == LUSTRE_IMP_CLOSED) {
 508                 DEBUG_REQ(D_ERROR, req, "IMP_CLOSED ");
 509                 *status = -EIO;
 510         } else if (req->rq_send_state == LUSTRE_IMP_CONNECTING &&
 511                  imp->imp_state == LUSTRE_IMP_CONNECTING) {
 512                 /* allow CONNECT even if import is invalid */ ;
 513         } else if (imp->imp_invalid) {
 514                 /* If the import has been invalidated (such as by an OST
 515                  * failure), the request must fail with -EIO. */
 516                 if (!imp->imp_deactive)
 517                         DEBUG_REQ(D_ERROR, req, "IMP_INVALID");
 518                 *status = -EIO;
 519         } else if (req->rq_import_generation != imp->imp_generation) {
 520                 DEBUG_REQ(D_ERROR, req, "req wrong generation:");
 521                 *status = -EIO;
 522         } else if (req->rq_send_state != imp->imp_state) {
 523                 if (imp->imp_obd->obd_no_recov || imp->imp_dlm_fake ||
 524                     req->rq_no_delay)
 525                         *status = -EWOULDBLOCK;
 526                 else
 527                         delay = 1;
 528         }
 529
 530         RETURN(delay);
 531 }
 532
 533 static int ptlrpc_check_reply(struct ptlrpc_request *req)
 534 {
 535         int rc = 0;
 536         ENTRY;
 537
 538         /* serialise with network callback */
 539         spin_lock(&req->rq_lock);
 540
 541         if (req->rq_replied)
 542                 GOTO(out, rc = 1);
 543
 544         if (req->rq_net_err && !req->rq_timedout) {
 545                 spin_unlock(&req->rq_lock);
 546                 rc = ptlrpc_expire_one_request(req);
 547                 spin_lock(&req->rq_lock);
 548                 GOTO(out, rc);
 549         }
 550
 551         if (req->rq_err)
 552                 GOTO(out, rc = 1);
 553
 554         if (req->rq_resend)
 555                 GOTO(out, rc = 1);
 556
 557         if (req->rq_restart)
 558                 GOTO(out, rc = 1);
 559         EXIT;
 560  out:
 561         spin_unlock(&req->rq_lock);
 562         DEBUG_REQ(D_NET, req, "rc = %d for", rc);
 563         return rc;
 564 }
 565
 566 static int ptlrpc_check_status(struct ptlrpc_request *req)
 567 {
 568         int err;
 569         ENTRY;
 570
 571         err = lustre_msg_get_status(req->rq_repmsg);
 572         if (lustre_msg_get_type(req->rq_repmsg) == PTL_RPC_MSG_ERR) {
 573                 DEBUG_REQ(D_ERROR, req, "type == PTL_RPC_MSG_ERR, err == %d",
 574                           err);
 575                 RETURN(err < 0 ? err : -EINVAL);
 576         }
 577
 578         if (err < 0) {
 579                 DEBUG_REQ(D_INFO, req, "status is %d", err);
 580         } else if (err > 0) {
 581                 /* XXX: translate this error from net to host */
 582                 DEBUG_REQ(D_INFO, req, "status is %d", err);
 583         }
 584
 585         RETURN(err);
 586 }
 587
 588 static int after_reply(struct ptlrpc_request *req)
 589 {
 590         struct obd_import *imp = req->rq_import;
 591         int rc;
 592         ENTRY;
 593
 594         LASSERT(!req->rq_receiving_reply);
 595
 596         /* NB Until this point, the whole of the incoming message,
 597          * including buflens, status etc is in the sender's byte order. */
 598
 599 #if SWAB_PARANOIA
 600         /* Clear reply swab mask; this is a new reply in sender's byte order */
 601         req->rq_rep_swab_mask = 0;
 602 #endif
 603         LASSERT (req->rq_nob_received <= req->rq_replen);
 604         rc = lustre_unpack_msg(req->rq_repmsg, req->rq_nob_received);
 605         if (rc) {
 606                 DEBUG_REQ(D_ERROR, req, "unpack_rep failed: %d\n", rc);
 607                 RETURN(-EPROTO);
 608         }
 609
 610         rc = lustre_unpack_rep_ptlrpc_body(req, MSG_PTLRPC_BODY_OFF);
 611         if (rc) {
 612                 DEBUG_REQ(D_ERROR, req, "unpack ptlrpc body failed: %d\n", rc);
 613                 RETURN(-EPROTO);
 614         }
 615
 616         if (lustre_msg_get_type(req->rq_repmsg) != PTL_RPC_MSG_REPLY &&
 617             lustre_msg_get_type(req->rq_repmsg) != PTL_RPC_MSG_ERR) {
 618                 DEBUG_REQ(D_ERROR, req, "invalid packet received (type=%u)\n",
 619                           lustre_msg_get_type(req->rq_repmsg));
 620                 RETURN(-EPROTO);
 621         }
 622
 623         rc = ptlrpc_check_status(req);
 624
 625         /* Either we've been evicted, or the server has failed for
 626          * some reason. Try to reconnect, and if that fails, punt to the
 627          * upcall. */
 628         if ((rc == -ENOTCONN) || (rc == -ENODEV)) {
 629                 if (req->rq_send_state != LUSTRE_IMP_FULL ||
 630                     imp->imp_obd->obd_no_recov || imp->imp_dlm_fake) {
 631                         RETURN(-ENOTCONN);
 632                 }
 633
 634                 ptlrpc_request_handle_notconn(req);
 635
 636                 RETURN(rc);
 637         }
 638
 639         /* Store transno in reqmsg for replay. */
 640         req->rq_transno = lustre_msg_get_transno(req->rq_repmsg);
 641         lustre_msg_set_transno(req->rq_reqmsg, req->rq_transno);
 642
 643         if (req->rq_import->imp_replayable) {
 644                 spin_lock(&imp->imp_lock);
 645                 /* no point in adding already-committed requests to the replay
 646                  * list, we will just remove them immediately. b=9829 */
 647                 if (req->rq_transno != 0 &&
 648                     (req->rq_transno >
 649                      lustre_msg_get_last_committed(req->rq_repmsg) ||
 650                      req->rq_replay))
 651                         ptlrpc_retain_replayable_request(req, imp);
 652                 else if (req->rq_commit_cb != NULL) {
 653                         spin_unlock(&imp->imp_lock);
 654                         req->rq_commit_cb(req);
 655                         spin_lock(&imp->imp_lock);
 656                 }
 657
 658                 /* Replay-enabled imports return commit-status information. */
 659                 if (lustre_msg_get_last_committed(req->rq_repmsg))
 660                         imp->imp_peer_committed_transno =
 661                                 lustre_msg_get_last_committed(req->rq_repmsg);
 662                 ptlrpc_free_committed(imp);
 663                 spin_unlock(&imp->imp_lock);
 664         }
 665
 666         RETURN(rc);
 667 }
 668
 669 static int ptlrpc_send_new_req(struct ptlrpc_request *req)
 670 {
 671         struct obd_import     *imp;
 672         int rc;
 673         ENTRY;
 674
 675         LASSERT(req->rq_phase == RQ_PHASE_NEW);
 676         req->rq_phase = RQ_PHASE_RPC;
 677
 678         imp = req->rq_import;
 679         spin_lock(&imp->imp_lock);
 680
 681         req->rq_import_generation = imp->imp_generation;
 682
 683         if (ptlrpc_import_delay_req(imp, req, &rc)) {
 684                 spin_lock (&req->rq_lock);
 685                 req->rq_waiting = 1;
 686                 spin_unlock (&req->rq_lock);
 687
 688                 DEBUG_REQ(D_HA, req, "req from PID %d waiting for recovery: "
 689                           "(%s != %s)",
 690                           lustre_msg_get_status(req->rq_reqmsg) ,
 691                           ptlrpc_import_state_name(req->rq_send_state),
 692                           ptlrpc_import_state_name(imp->imp_state));
 693                 LASSERT(list_empty (&req->rq_list));
 694
 695                 list_add_tail(&req->rq_list, &imp->imp_delayed_list);
 696                 spin_unlock(&imp->imp_lock);
 697                 RETURN(0);
 698         }
 699
 700         if (rc != 0) {
 701                 spin_unlock(&imp->imp_lock);
 702                 req->rq_status = rc;
 703                 req->rq_phase = RQ_PHASE_INTERPRET;
 704                 RETURN(rc);
 705         }
 706
 707         /* XXX this is the same as ptlrpc_queue_wait */
 708         LASSERT(list_empty(&req->rq_list));
 709         list_add_tail(&req->rq_list, &imp->imp_sending_list);
 710         spin_unlock(&imp->imp_lock);
 711
 712         lustre_msg_set_status(req->rq_reqmsg, cfs_curproc_pid());
 713         CDEBUG(D_RPCTRACE, "Sending RPC pname:cluuid:pid:xid:nid:opc"
 714                " %s:%s:%d:"LPU64":%s:%d\n", cfs_curproc_comm(),
 715                imp->imp_obd->obd_uuid.uuid,
 716                lustre_msg_get_status(req->rq_reqmsg), req->rq_xid,
 717                libcfs_nid2str(imp->imp_connection->c_peer.nid),
 718                lustre_msg_get_opc(req->rq_reqmsg));
 719
 720         rc = ptl_send_rpc(req, 0);
 721         if (rc) {
 722                 DEBUG_REQ(D_HA, req, "send failed (%d); expect timeout", rc);
 723                 req->rq_net_err = 1;
 724                 RETURN(rc);
 725         }
 726         RETURN(0);
 727 }
 728
 729 /* this sends any unsent RPCs in @set and returns TRUE if all are sent */
 730 int ptlrpc_check_set(struct ptlrpc_request_set *set)
 731 {
 732         struct list_head *tmp;
 733         int force_timer_recalc = 0;
 734         ENTRY;
 735
 736         if (set->set_remaining == 0)
 737                 RETURN(1);
 738
 739         list_for_each(tmp, &set->set_requests) {
 740                 struct ptlrpc_request *req =
 741                         list_entry(tmp, struct ptlrpc_request, rq_set_chain);
 742                 struct obd_import *imp = req->rq_import;
 743                 int rc = 0;
 744
 745                 if (req->rq_phase == RQ_PHASE_NEW &&
 746                     ptlrpc_send_new_req(req)) {
 747                         force_timer_recalc = 1;
 748                 }
 749
 750                 if (!(req->rq_phase == RQ_PHASE_RPC ||
 751                       req->rq_phase == RQ_PHASE_BULK ||
 752                       req->rq_phase == RQ_PHASE_INTERPRET ||
 753                       req->rq_phase == RQ_PHASE_COMPLETE)) {
 754                         DEBUG_REQ(D_ERROR, req, "bad phase %x", req->rq_phase);
 755                         LBUG();
 756                 }
 757
 758                 if (req->rq_phase == RQ_PHASE_COMPLETE)
 759                         continue;
 760
 761                 if (req->rq_phase == RQ_PHASE_INTERPRET)
 762                         GOTO(interpret, req->rq_status);
 763
 764                 if (req->rq_net_err && !req->rq_timedout)
 765                         ptlrpc_expire_one_request(req);
 766
 767                 if (req->rq_err) {
 768                         ptlrpc_unregister_reply(req);
 769                         if (req->rq_status == 0)
 770                                 req->rq_status = -EIO;
 771                         req->rq_phase = RQ_PHASE_INTERPRET;
 772
 773                         spin_lock(&imp->imp_lock);
 774                         list_del_init(&req->rq_list);
 775                         spin_unlock(&imp->imp_lock);
 776
 777                         GOTO(interpret, req->rq_status);
 778                 }
 779
 780                 /* ptlrpc_queue_wait->l_wait_event guarantees that rq_intr
 781                  * will only be set after rq_timedout, but the oig waiting
 782                  * path sets rq_intr irrespective of whether ptlrpcd has
 783                  * seen a timeout.  our policy is to only interpret
 784                  * interrupted rpcs after they have timed out */
 785                 if (req->rq_intr && (req->rq_timedout || req->rq_waiting)) {
 786                         /* NB could be on delayed list */
 787                         ptlrpc_unregister_reply(req);
 788                         req->rq_status = -EINTR;
 789                         req->rq_phase = RQ_PHASE_INTERPRET;
 790
 791                         spin_lock(&imp->imp_lock);
 792                         list_del_init(&req->rq_list);
 793                         spin_unlock(&imp->imp_lock);
 794
 795                         GOTO(interpret, req->rq_status);
 796                 }
 797
 798                 if (req->rq_phase == RQ_PHASE_RPC) {
 799                         if (req->rq_timedout||req->rq_waiting||req->rq_resend) {
 800                                 int status;
 801
 802                                 ptlrpc_unregister_reply(req);
 803
 804                                 spin_lock(&imp->imp_lock);
 805
 806                                 if (ptlrpc_import_delay_req(imp, req, &status)){
 807                                         spin_unlock(&imp->imp_lock);
 808                                         continue;
 809                                 }
 810
 811                                 list_del_init(&req->rq_list);
 812                                 if (status != 0)  {
 813                                         req->rq_status = status;
 814                                         req->rq_phase = RQ_PHASE_INTERPRET;
 815                                         spin_unlock(&imp->imp_lock);
 816                                         GOTO(interpret, req->rq_status);
 817                                 }
 818                                 if (req->rq_no_resend) {
 819                                         req->rq_status = -ENOTCONN;
 820                                         req->rq_phase = RQ_PHASE_INTERPRET;
 821                                         spin_unlock(&imp->imp_lock);
 822                                         GOTO(interpret, req->rq_status);
 823                                 }
 824                                 list_add_tail(&req->rq_list,
 825                                               &imp->imp_sending_list);
 826
 827                                 spin_unlock(&imp->imp_lock);
 828
 829                                 req->rq_waiting = 0;
 830                                 if (req->rq_resend) {
 831                                         lustre_msg_add_flags(req->rq_reqmsg,
 832                                                              MSG_RESENT);
 833                                         if (req->rq_bulk) {
 834                                                 __u64 old_xid = req->rq_xid;
 835
 836                                                 ptlrpc_unregister_bulk (req);
 837
 838                                                 /* ensure previous bulk fails */
 839                                                 req->rq_xid = ptlrpc_next_xid();
 840                                                 CDEBUG(D_HA, "resend bulk "
 841                                                        "old x"LPU64
 842                                                        " new x"LPU64"\n",
 843                                                        old_xid, req->rq_xid);
 844                                         }
 845                                 }
 846
 847                                 rc = ptl_send_rpc(req, 0);
 848                                 if (rc) {
 849                                         DEBUG_REQ(D_HA, req, "send failed (%d)",
 850                                                   rc);
 851                                         force_timer_recalc = 1;
 852                                         req->rq_net_err = 1;
 853                                 }
 854                                 /* need to reset the timeout */
 855                                 force_timer_recalc = 1;
 856                         }
 857
 858                         /* Still waiting for a reply? */
 859                         if (ptlrpc_client_receiving_reply(req))
 860                                 continue;
 861
 862                         /* Did we actually receive a reply? */
 863                         if (!ptlrpc_client_replied(req))
 864                                 continue;
 865
 866                         spin_lock(&imp->imp_lock);
 867                         list_del_init(&req->rq_list);
 868                         spin_unlock(&imp->imp_lock);
 869
 870                         req->rq_status = after_reply(req);
 871                         if (req->rq_resend) {
 872                                 /* Add this req to the delayed list so
 873                                    it can be errored if the import is
 874                                    evicted after recovery. */
 875                                 spin_lock(&req->rq_lock);
 876                                 list_add_tail(&req->rq_list,
 877                                               &imp->imp_delayed_list);
 878                                 spin_unlock(&req->rq_lock);
 879                                 continue;
 880                         }
 881
 882                         /* If there is no bulk associated with this request,
 883                          * then we're done and should let the interpreter
 884                          * process the reply.  Similarly if the RPC returned
 885                          * an error, and therefore the bulk will never arrive.
 886                          */
 887                         if (req->rq_bulk == NULL || req->rq_status != 0) {
 888                                 req->rq_phase = RQ_PHASE_INTERPRET;
 889                                 GOTO(interpret, req->rq_status);
 890                         }
 891
 892                         req->rq_phase = RQ_PHASE_BULK;
 893                 }
 894
 895                 LASSERT(req->rq_phase == RQ_PHASE_BULK);
 896                 if (ptlrpc_bulk_active(req->rq_bulk))
 897                         continue;
 898
 899                 if (!req->rq_bulk->bd_success) {
 900                         /* The RPC reply arrived OK, but the bulk screwed
 901                          * up!  Dead wierd since the server told us the RPC
 902                          * was good after getting the REPLY for her GET or
 903                          * the ACK for her PUT. */
 904                         DEBUG_REQ(D_ERROR, req, "bulk transfer failed");
 905                         LBUG();
 906                 }
 907
 908                 req->rq_phase = RQ_PHASE_INTERPRET;
 909
 910         interpret:
 911                 LASSERT(req->rq_phase == RQ_PHASE_INTERPRET);
 912                 LASSERT(!req->rq_receiving_reply);
 913
 914                 ptlrpc_unregister_reply(req);
 915                 if (req->rq_bulk != NULL)
 916                         ptlrpc_unregister_bulk (req);
 917
 918                 req->rq_phase = RQ_PHASE_COMPLETE;
 919
 920                 if (req->rq_interpret_reply != NULL) {
 921                         int (*interpreter)(struct ptlrpc_request *,void *,int) =
 922                                 req->rq_interpret_reply;
 923                         req->rq_status = interpreter(req, &req->rq_async_args,
 924                                                      req->rq_status);
 925                 }
 926
 927                 CDEBUG(D_RPCTRACE, "Completed RPC pname:cluuid:pid:xid:nid:"
 928                        "opc %s:%s:%d:"LPU64":%s:%d\n", cfs_curproc_comm(),
 929                        imp->imp_obd->obd_uuid.uuid,
 930                        lustre_msg_get_status(req->rq_reqmsg), req->rq_xid,
 931                        libcfs_nid2str(imp->imp_connection->c_peer.nid),
 932                        lustre_msg_get_opc(req->rq_reqmsg));
 933
 934                 set->set_remaining--;
 935
 936                 atomic_dec(&imp->imp_inflight);
 937                 cfs_waitq_signal(&imp->imp_recovery_waitq);
 938         }
 939
 940         /* If we hit an error, we want to recover promptly. */
 941         RETURN(set->set_remaining == 0 || force_timer_recalc);
 942 }
 943
 944 int ptlrpc_expire_one_request(struct ptlrpc_request *req)
 945 {
 946         struct obd_import *imp = req->rq_import;
 947         ENTRY;
 948
 949         DEBUG_REQ(D_ERROR|D_NETERROR, req, "timeout (sent at %lu, %lus ago)",
 950                   (long)req->rq_sent, CURRENT_SECONDS - req->rq_sent);
 951 #if 0
 952         /* Leave this out normally: it creates too much console noise and we
 953          * only need it when we're debugging networks */
 954         if (imp != NULL)
 955                 LNetCtl(IOC_LIBCFS_DEBUG_PEER, &imp->imp_connection->c_peer);
 956 #endif
 957         spin_lock(&req->rq_lock);
 958         req->rq_timedout = 1;
 959         spin_unlock(&req->rq_lock);
 960
 961         ptlrpc_unregister_reply (req);
 962
 963         if (obd_dump_on_timeout)
 964                 libcfs_debug_dumplog();
 965
 966         if (req->rq_bulk != NULL)
 967                 ptlrpc_unregister_bulk (req);
 968
 969         if (imp == NULL) {
 970                 DEBUG_REQ(D_HA, req, "NULL import: already cleaned up?");
 971                 RETURN(1);
 972         }
 973
 974         /* The DLM server doesn't want recovery run on its imports. */
 975         if (imp->imp_dlm_fake)
 976                 RETURN(1);
 977
 978         /* If this request is for recovery or other primordial tasks,
 979          * then error it out here. */
 980         if (req->rq_send_state != LUSTRE_IMP_FULL ||
 981             imp->imp_obd->obd_no_recov) {
 982                 spin_lock(&req->rq_lock);
 983                 req->rq_status = -ETIMEDOUT;
 984                 req->rq_err = 1;
 985                 spin_unlock(&req->rq_lock);
 986                 RETURN(1);
 987         }
 988
 989         ptlrpc_fail_import(imp, lustre_msg_get_conn_cnt(req->rq_reqmsg));
 990
 991         RETURN(0);
 992 }
 993
 994 int ptlrpc_expired_set(void *data)
 995 {
 996         struct ptlrpc_request_set *set = data;
 997         struct list_head          *tmp;
 998         time_t                     now = CURRENT_SECONDS;
 999         ENTRY;
1000
1001         LASSERT(set != NULL);
1002
1003         /* A timeout expired; see which reqs it applies to... */
1004         list_for_each (tmp, &set->set_requests) {
1005                 struct ptlrpc_request *req =
1006                         list_entry(tmp, struct ptlrpc_request, rq_set_chain);
1007
1008                 /* request in-flight? */
1009                 if (!((req->rq_phase == RQ_PHASE_RPC && !req->rq_waiting &&
1010                        !req->rq_resend) ||
1011                       (req->rq_phase == RQ_PHASE_BULK)))
1012                         continue;
1013
1014                 if (req->rq_timedout ||           /* already dealt with */
1015                     req->rq_sent + req->rq_timeout > now) /* not expired */
1016                         continue;
1017
1018                 /* deal with this guy */
1019                 ptlrpc_expire_one_request (req);
1020         }
1021
1022         /* When waiting for a whole set, we always to break out of the
1023          * sleep so we can recalculate the timeout, or enable interrupts
1024          * iff everyone's timed out.
1025          */
1026         RETURN(1);
1027 }
1028
1029 void ptlrpc_mark_interrupted(struct ptlrpc_request *req)
1030 {
1031         spin_lock(&req->rq_lock);
1032         req->rq_intr = 1;
1033         spin_unlock(&req->rq_lock);
1034 }
1035
1036 void ptlrpc_interrupted_set(void *data)
1037 {
1038         struct ptlrpc_request_set *set = data;
1039         struct list_head *tmp;
1040
1041         LASSERT(set != NULL);
1042         CERROR("INTERRUPTED SET %p\n", set);
1043
1044         list_for_each(tmp, &set->set_requests) {
1045                 struct ptlrpc_request *req =
1046                         list_entry(tmp, struct ptlrpc_request, rq_set_chain);
1047
1048                 if (req->rq_phase != RQ_PHASE_RPC)
1049                         continue;
1050
1051                 ptlrpc_mark_interrupted(req);
1052         }
1053 }
1054
1055 int ptlrpc_set_next_timeout(struct ptlrpc_request_set *set)
1056 {
1057         struct list_head      *tmp;
1058         time_t                 now = CURRENT_SECONDS;
1059         time_t                 deadline;
1060         int                    timeout = 0;
1061         struct ptlrpc_request *req;
1062         ENTRY;
1063
1064         SIGNAL_MASK_ASSERT(); /* XXX BUG 1511 */
1065
1066         list_for_each(tmp, &set->set_requests) {
1067                 req = list_entry(tmp, struct ptlrpc_request, rq_set_chain);
1068
1069                 /* request in-flight? */
1070                 if (!((req->rq_phase == RQ_PHASE_RPC && !req->rq_waiting) ||
1071                       (req->rq_phase == RQ_PHASE_BULK)))
1072                         continue;
1073
1074                 if (req->rq_timedout)   /* already timed out */
1075                         continue;
1076
1077                 deadline = req->rq_sent + req->rq_timeout;
1078                 if (deadline <= now)    /* actually expired already */
1079                         timeout = 1;    /* ASAP */
1080                 else if (timeout == 0 || timeout > deadline - now)
1081                         timeout = deadline - now;
1082         }
1083         RETURN(timeout);
1084 }
1085
1086 int ptlrpc_set_wait(struct ptlrpc_request_set *set)
1087 {
1088         struct list_head      *tmp;
1089         struct ptlrpc_request *req;
1090         struct l_wait_info     lwi;
1091         int                    rc, timeout;
1092         ENTRY;
1093
1094         if (list_empty(&set->set_requests))
1095                 RETURN(0);
1096
1097         list_for_each(tmp, &set->set_requests) {
1098                 req = list_entry(tmp, struct ptlrpc_request, rq_set_chain);
1099                 if (req->rq_phase == RQ_PHASE_NEW)
1100                         (void)ptlrpc_send_new_req(req);
1101         }
1102
1103         do {
1104                 timeout = ptlrpc_set_next_timeout(set);
1105
1106                 /* wait until all complete, interrupted, or an in-flight
1107                  * req times out */
1108                 CDEBUG(D_HA, "set %p going to sleep for %d seconds\n",
1109                        set, timeout);
1110                 lwi = LWI_TIMEOUT_INTR(cfs_time_seconds(timeout ? timeout : 1),
1111                                        ptlrpc_expired_set,
1112                                        ptlrpc_interrupted_set, set);
1113                 rc = l_wait_event(set->set_waitq, ptlrpc_check_set(set), &lwi);
1114
1115                 LASSERT(rc == 0 || rc == -EINTR || rc == -ETIMEDOUT);
1116
1117                 /* -EINTR => all requests have been flagged rq_intr so next
1118                  * check completes.
1119                  * -ETIMEOUTD => someone timed out.  When all reqs have
1120                  * timed out, signals are enabled allowing completion with
1121                  * EINTR.
1122                  * I don't really care if we go once more round the loop in
1123                  * the error cases -eeb. */
1124         } while (rc != 0 || set->set_remaining != 0);
1125
1126         LASSERT(set->set_remaining == 0);
1127
1128         rc = 0;
1129         list_for_each(tmp, &set->set_requests) {
1130                 req = list_entry(tmp, struct ptlrpc_request, rq_set_chain);
1131
1132                 LASSERT(req->rq_phase == RQ_PHASE_COMPLETE);
1133                 if (req->rq_status != 0)
1134                         rc = req->rq_status;
1135         }
1136
1137         if (set->set_interpret != NULL) {
1138                 int (*interpreter)(struct ptlrpc_request_set *set,void *,int) =
1139                         set->set_interpret;
1140                 rc = interpreter (set, set->set_arg, rc);
1141         }
1142
1143         RETURN(rc);
1144 }
1145
1146 static void __ptlrpc_free_req_to_pool(struct ptlrpc_request *request)
1147 {
1148         struct ptlrpc_request_pool *pool = request->rq_pool;
1149
1150         spin_lock(&pool->prp_lock);
1151         list_add_tail(&request->rq_list, &pool->prp_req_list);
1152         spin_unlock(&pool->prp_lock);
1153 }
1154
1155 static void __ptlrpc_free_req(struct ptlrpc_request *request, int locked)
1156 {
1157         ENTRY;
1158         if (request == NULL) {
1159                 EXIT;
1160                 return;
1161         }
1162
1163         LASSERTF(!request->rq_receiving_reply, "req %p\n", request);
1164         LASSERTF(request->rq_rqbd == NULL, "req %p\n",request);/* client-side */
1165         LASSERTF(list_empty(&request->rq_list), "req %p\n", request);
1166         LASSERTF(list_empty(&request->rq_set_chain), "req %p\n", request);
1167
1168         /* We must take it off the imp_replay_list first.  Otherwise, we'll set
1169          * request->rq_reqmsg to NULL while osc_close is dereferencing it. */
1170         if (request->rq_import != NULL) {
1171                 if (!locked)
1172                         spin_lock(&request->rq_import->imp_lock);
1173                 list_del_init(&request->rq_replay_list);
1174                 if (!locked)
1175                         spin_unlock(&request->rq_import->imp_lock);
1176         }
1177         LASSERTF(list_empty(&request->rq_replay_list), "req %p\n", request);
1178
1179         if (atomic_read(&request->rq_refcount) != 0) {
1180                 DEBUG_REQ(D_ERROR, request,
1181                           "freeing request with nonzero refcount");
1182                 LBUG();
1183         }
1184
1185         if (request->rq_repmsg != NULL) {
1186                 OBD_FREE(request->rq_repmsg, request->rq_replen);
1187                 request->rq_repmsg = NULL;
1188         }
1189         if (request->rq_export != NULL) {
1190                 class_export_put(request->rq_export);
1191                 request->rq_export = NULL;
1192         }
1193         if (request->rq_import != NULL) {
1194                 class_import_put(request->rq_import);
1195                 request->rq_import = NULL;
1196         }
1197         if (request->rq_bulk != NULL)
1198                 ptlrpc_free_bulk(request->rq_bulk);
1199
1200         if (request->rq_pool) {
1201                 __ptlrpc_free_req_to_pool(request);
1202         } else {
1203                 if (request->rq_reqmsg != NULL) {
1204                         OBD_FREE(request->rq_reqmsg, request->rq_reqlen);
1205                         request->rq_reqmsg = NULL;
1206                 }
1207                 OBD_FREE(request, sizeof(*request));
1208         }
1209         EXIT;
1210 }
1211
1212 void ptlrpc_free_req(struct ptlrpc_request *request)
1213 {
1214         __ptlrpc_free_req(request, 0);
1215 }
1216
1217 static int __ptlrpc_req_finished(struct ptlrpc_request *request, int locked);
1218 void ptlrpc_req_finished_with_imp_lock(struct ptlrpc_request *request)
1219 {
1220         LASSERT_SPIN_LOCKED(&request->rq_import->imp_lock);
1221         (void)__ptlrpc_req_finished(request, 1);
1222 }
1223
1224 static int __ptlrpc_req_finished(struct ptlrpc_request *request, int locked)
1225 {
1226         ENTRY;
1227         if (request == NULL)
1228                 RETURN(1);
1229
1230         if (request == LP_POISON ||
1231             request->rq_reqmsg == LP_POISON) {
1232                 CERROR("dereferencing freed request (bug 575)\n");
1233                 LBUG();
1234                 RETURN(1);
1235         }
1236
1237         DEBUG_REQ(D_INFO, request, "refcount now %u",
1238                   atomic_read(&request->rq_refcount) - 1);
1239
1240         if (atomic_dec_and_test(&request->rq_refcount)) {
1241                 __ptlrpc_free_req(request, locked);
1242                 RETURN(1);
1243         }
1244
1245         RETURN(0);
1246 }
1247
1248 void ptlrpc_req_finished(struct ptlrpc_request *request)
1249 {
1250         __ptlrpc_req_finished(request, 0);
1251 }
1252
1253 __u64 ptlrpc_req_xid(struct ptlrpc_request *request)
1254 {
1255         return request->rq_xid;
1256 }
1257 EXPORT_SYMBOL(ptlrpc_req_xid);
1258
1259 /* Disengage the client's reply buffer from the network
1260  * NB does _NOT_ unregister any client-side bulk.
1261  * IDEMPOTENT, but _not_ safe against concurrent callers.
1262  * The request owner (i.e. the thread doing the I/O) must call...
1263  */
1264 void ptlrpc_unregister_reply (struct ptlrpc_request *request)
1265 {
1266         int                rc;
1267         cfs_waitq_t       *wq;
1268         struct l_wait_info lwi;
1269
1270         LASSERT(!in_interrupt ());             /* might sleep */
1271
1272         if (!ptlrpc_client_receiving_reply(request))
1273                 return;
1274
1275         LNetMDUnlink (request->rq_reply_md_h);
1276
1277         /* We have to l_wait_event() whatever the result, to give liblustre
1278          * a chance to run reply_in_callback() */
1279
1280         if (request->rq_set != NULL)
1281                 wq = &request->rq_set->set_waitq;
1282         else
1283                 wq = &request->rq_reply_waitq;
1284
1285         for (;;) {
1286                 /* Network access will complete in finite time but the HUGE
1287                  * timeout lets us CWARN for visibility of sluggish NALs */
1288                 lwi = LWI_TIMEOUT(cfs_time_seconds(300), NULL, NULL);
1289                 rc = l_wait_event (*wq, !ptlrpc_client_receiving_reply(request), &lwi);
1290                 if (rc == 0)
1291                         return;
1292
1293                 LASSERT (rc == -ETIMEDOUT);
1294                 DEBUG_REQ(D_WARNING, request, "Unexpectedly long timeout");
1295         }
1296 }
1297
1298 /* caller must hold imp->imp_lock */
1299 void ptlrpc_free_committed(struct obd_import *imp)
1300 {
1301         struct list_head *tmp, *saved;
1302         struct ptlrpc_request *req;
1303         struct ptlrpc_request *last_req = NULL; /* temporary fire escape */
1304         ENTRY;
1305
1306         LASSERT(imp != NULL);
1307
1308         LASSERT_SPIN_LOCKED(&imp->imp_lock);
1309
1310
1311         if (imp->imp_peer_committed_transno == imp->imp_last_transno_checked &&
1312             imp->imp_generation == imp->imp_last_generation_checked) {
1313                 CDEBUG(D_HA, "%s: skip recheck for last_committed "LPU64"\n",
1314                        imp->imp_obd->obd_name, imp->imp_peer_committed_transno);
1315                 return;
1316         }
1317
1318         CDEBUG(D_HA, "%s: committing for last_committed "LPU64" gen %d\n",
1319                imp->imp_obd->obd_name, imp->imp_peer_committed_transno,
1320                imp->imp_generation);
1321         imp->imp_last_transno_checked = imp->imp_peer_committed_transno;
1322         imp->imp_last_generation_checked = imp->imp_generation;
1323
1324         list_for_each_safe(tmp, saved, &imp->imp_replay_list) {
1325                 req = list_entry(tmp, struct ptlrpc_request, rq_replay_list);
1326
1327                 /* XXX ok to remove when 1357 resolved - rread 05/29/03  */
1328                 LASSERT(req != last_req);
1329                 last_req = req;
1330
1331                 if (req->rq_import_generation < imp->imp_generation) {
1332                         DEBUG_REQ(D_HA, req, "freeing request with old gen");
1333                         GOTO(free_req, 0);
1334                 }
1335
1336                 if (req->rq_replay) {
1337                         DEBUG_REQ(D_HA, req, "keeping (FL_REPLAY)");
1338                         continue;
1339                 }
1340
1341                 /* not yet committed */
1342                 if (req->rq_transno > imp->imp_peer_committed_transno) {
1343                         DEBUG_REQ(D_HA, req, "stopping search");
1344                         break;
1345                 }
1346
1347                 DEBUG_REQ(D_HA, req, "committing (last_committed "LPU64")",
1348                           imp->imp_peer_committed_transno);
1349 free_req:
1350                 if (req->rq_commit_cb != NULL)
1351                         req->rq_commit_cb(req);
1352                 list_del_init(&req->rq_replay_list);
1353                 __ptlrpc_req_finished(req, 1);
1354         }
1355
1356         EXIT;
1357         return;
1358 }
1359
1360 void ptlrpc_cleanup_client(struct obd_import *imp)
1361 {
1362         ENTRY;
1363         EXIT;
1364         return;
1365 }
1366
1367 void ptlrpc_resend_req(struct ptlrpc_request *req)
1368 {
1369         DEBUG_REQ(D_HA, req, "going to resend");
1370         lustre_msg_set_handle(req->rq_reqmsg, &(struct lustre_handle){ 0 });
1371         req->rq_status = -EAGAIN;
1372
1373         spin_lock(&req->rq_lock);
1374         req->rq_resend = 1;
1375         req->rq_net_err = 0;
1376         req->rq_timedout = 0;
1377         if (req->rq_bulk) {
1378                 __u64 old_xid = req->rq_xid;
1379
1380                 /* ensure previous bulk fails */
1381                 req->rq_xid = ptlrpc_next_xid();
1382                 CDEBUG(D_HA, "resend bulk old x"LPU64" new x"LPU64"\n",
1383                        old_xid, req->rq_xid);
1384         }
1385         ptlrpc_wake_client_req(req);
1386         spin_unlock(&req->rq_lock);
1387 }
1388
1389 /* XXX: this function and rq_status are currently unused */
1390 void ptlrpc_restart_req(struct ptlrpc_request *req)
1391 {
1392         DEBUG_REQ(D_HA, req, "restarting (possibly-)completed request");
1393         req->rq_status = -ERESTARTSYS;
1394
1395         spin_lock(&req->rq_lock);
1396         req->rq_restart = 1;
1397         req->rq_timedout = 0;
1398         ptlrpc_wake_client_req(req);
1399         spin_unlock(&req->rq_lock);
1400 }
1401
1402 static int expired_request(void *data)
1403 {
1404         struct ptlrpc_request *req = data;
1405         ENTRY;
1406
1407         RETURN(ptlrpc_expire_one_request(req));
1408 }
1409
1410 static void interrupted_request(void *data)
1411 {
1412         struct ptlrpc_request *req = data;
1413         DEBUG_REQ(D_HA, req, "request interrupted");
1414         spin_lock(&req->rq_lock);
1415         req->rq_intr = 1;
1416         spin_unlock(&req->rq_lock);
1417 }
1418
1419 struct ptlrpc_request *ptlrpc_request_addref(struct ptlrpc_request *req)
1420 {
1421         ENTRY;
1422         atomic_inc(&req->rq_refcount);
1423         RETURN(req);
1424 }
1425
1426 void ptlrpc_retain_replayable_request(struct ptlrpc_request *req,
1427                                       struct obd_import *imp)
1428 {
1429         struct list_head *tmp;
1430
1431         LASSERT_SPIN_LOCKED(&imp->imp_lock);
1432
1433         /* clear this for new requests that were resent as well
1434            as resent replayed requests. */
1435         lustre_msg_clear_flags(req->rq_reqmsg, MSG_RESENT);
1436
1437         /* don't re-add requests that have been replayed */
1438         if (!list_empty(&req->rq_replay_list))
1439                 return;
1440
1441         lustre_msg_add_flags(req->rq_reqmsg, MSG_REPLAY);
1442
1443         LASSERT(imp->imp_replayable);
1444         /* Balanced in ptlrpc_free_committed, usually. */
1445         ptlrpc_request_addref(req);
1446         list_for_each_prev(tmp, &imp->imp_replay_list) {
1447                 struct ptlrpc_request *iter =
1448                         list_entry(tmp, struct ptlrpc_request, rq_replay_list);
1449
1450                 /* We may have duplicate transnos if we create and then
1451                  * open a file, or for closes retained if to match creating
1452                  * opens, so use req->rq_xid as a secondary key.
1453                  * (See bugs 684, 685, and 428.)
1454                  * XXX no longer needed, but all opens need transnos!
1455                  */
1456                 if (iter->rq_transno > req->rq_transno)
1457                         continue;
1458
1459                 if (iter->rq_transno == req->rq_transno) {
1460                         LASSERT(iter->rq_xid != req->rq_xid);
1461                         if (iter->rq_xid > req->rq_xid)
1462                                 continue;
1463                 }
1464
1465                 list_add(&req->rq_replay_list, &iter->rq_replay_list);
1466                 return;
1467         }
1468
1469         list_add_tail(&req->rq_replay_list, &imp->imp_replay_list);
1470 }
1471
1472 int ptlrpc_queue_wait(struct ptlrpc_request *req)
1473 {
1474         int rc = 0;
1475         int brc;
1476         struct l_wait_info lwi;
1477         struct obd_import *imp = req->rq_import;
1478         cfs_duration_t timeout = 0;
1479         ENTRY;
1480
1481         LASSERT(req->rq_set == NULL);
1482         LASSERT(!req->rq_receiving_reply);
1483         atomic_inc(&imp->imp_inflight);
1484
1485         /* for distributed debugging */
1486         lustre_msg_set_status(req->rq_reqmsg, cfs_curproc_pid());
1487         LASSERT(imp->imp_obd != NULL);
1488         CDEBUG(D_RPCTRACE, "Sending RPC pname:cluuid:pid:xid:nid:opc "
1489                "%s:%s:%d:"LPU64":%s:%d\n", cfs_curproc_comm(),
1490                imp->imp_obd->obd_uuid.uuid,
1491                lustre_msg_get_status(req->rq_reqmsg), req->rq_xid,
1492                libcfs_nid2str(imp->imp_connection->c_peer.nid),
1493                lustre_msg_get_opc(req->rq_reqmsg));
1494
1495         /* Mark phase here for a little debug help */
1496         req->rq_phase = RQ_PHASE_RPC;
1497
1498         spin_lock(&imp->imp_lock);
1499         req->rq_import_generation = imp->imp_generation;
1500 restart:
1501         if (ptlrpc_import_delay_req(imp, req, &rc)) {
1502                 list_del(&req->rq_list);
1503
1504                 list_add_tail(&req->rq_list, &imp->imp_delayed_list);
1505                 spin_unlock(&imp->imp_lock);
1506
1507                 DEBUG_REQ(D_HA, req, "\"%s\" waiting for recovery: (%s != %s)",
1508                           cfs_curproc_comm(),
1509                           ptlrpc_import_state_name(req->rq_send_state),
1510                           ptlrpc_import_state_name(imp->imp_state));
1511                 lwi = LWI_INTR(interrupted_request, req);
1512                 rc = l_wait_event(req->rq_reply_waitq,
1513                                   (req->rq_send_state == imp->imp_state ||
1514                                    req->rq_err || req->rq_intr),
1515                                   &lwi);
1516                 DEBUG_REQ(D_HA, req, "\"%s\" awake: (%s == %s or %d/%d == 1)",
1517                           cfs_curproc_comm(),
1518                           ptlrpc_import_state_name(imp->imp_state),
1519                           ptlrpc_import_state_name(req->rq_send_state),
1520                           req->rq_err, req->rq_intr);
1521
1522                 spin_lock(&imp->imp_lock);
1523                 list_del_init(&req->rq_list);
1524
1525                 if (req->rq_err) {
1526                         rc = -EIO;
1527                 }
1528                 else if (req->rq_intr) {
1529                         rc = -EINTR;
1530                 }
1531                 else if (req->rq_no_resend) {
1532                         spin_unlock(&imp->imp_lock);
1533                         GOTO(out, rc = -ETIMEDOUT);
1534                 }
1535                 else {
1536                         GOTO(restart, rc);
1537                 }
1538         }
1539
1540         if (rc != 0) {
1541                 list_del_init(&req->rq_list);
1542                 spin_unlock(&imp->imp_lock);
1543                 req->rq_status = rc; // XXX this ok?
1544                 GOTO(out, rc);
1545         }
1546
1547         if (req->rq_resend) {
1548                 lustre_msg_add_flags(req->rq_reqmsg, MSG_RESENT);
1549
1550                 if (req->rq_bulk != NULL) {
1551                         ptlrpc_unregister_bulk (req);
1552
1553                         /* bulk requests are supposed to be
1554                          * idempotent, so we are free to bump the xid
1555                          * here, which we need to do before
1556                          * registering the bulk again (bug 6371).
1557                          * print the old xid first for sanity.
1558                          */
1559                         DEBUG_REQ(D_HA, req, "bumping xid for bulk: ");
1560                         req->rq_xid = ptlrpc_next_xid();
1561                 }
1562
1563                 DEBUG_REQ(D_HA, req, "resending: ");
1564         }
1565
1566         /* XXX this is the same as ptlrpc_set_wait */
1567         LASSERT(list_empty(&req->rq_list));
1568         list_add_tail(&req->rq_list, &imp->imp_sending_list);
1569         spin_unlock(&imp->imp_lock);
1570
1571         rc = ptl_send_rpc(req, 0);
1572         if (rc) {
1573                 DEBUG_REQ(D_HA, req, "send failed (%d); recovering", rc);
1574                 timeout = CFS_TICK;
1575         } else {
1576                 timeout = cfs_timeout_cap(cfs_time_seconds(req->rq_timeout));
1577                 DEBUG_REQ(D_NET, req,
1578                           "-- sleeping for "CFS_DURATION_T" jiffies", timeout);
1579         }
1580         lwi = LWI_TIMEOUT_INTR(timeout, expired_request, interrupted_request,
1581                                req);
1582         l_wait_event(req->rq_reply_waitq, ptlrpc_check_reply(req), &lwi);
1583
1584         CDEBUG(D_RPCTRACE, "Completed RPC pname:cluuid:pid:xid:nid:opc "
1585                "%s:%s:%d:"LPU64":%s:%d\n", cfs_curproc_comm(),
1586                imp->imp_obd->obd_uuid.uuid,
1587                lustre_msg_get_status(req->rq_reqmsg), req->rq_xid,
1588                libcfs_nid2str(imp->imp_connection->c_peer.nid),
1589                lustre_msg_get_opc(req->rq_reqmsg));
1590
1591         spin_lock(&imp->imp_lock);
1592         list_del_init(&req->rq_list);
1593         spin_unlock(&imp->imp_lock);
1594
1595         /* If the reply was received normally, this just grabs the spinlock
1596          * (ensuring the reply callback has returned), sees that
1597          * req->rq_receiving_reply is clear and returns. */
1598         ptlrpc_unregister_reply (req);
1599
1600         if (req->rq_err)
1601                 GOTO(out, rc = -EIO);
1602
1603         /* Resend if we need to, unless we were interrupted. */
1604         if (req->rq_resend && !req->rq_intr) {
1605                 /* ...unless we were specifically told otherwise. */
1606                 if (req->rq_no_resend)
1607                         GOTO(out, rc = -ETIMEDOUT);
1608                 spin_lock(&imp->imp_lock);
1609                 goto restart;
1610         }
1611
1612         if (req->rq_intr) {
1613                 /* Should only be interrupted if we timed out. */
1614                 if (!req->rq_timedout)
1615                         DEBUG_REQ(D_ERROR, req,
1616                                   "rq_intr set but rq_timedout not");
1617                 GOTO(out, rc = -EINTR);
1618         }
1619
1620         if (req->rq_timedout) {                 /* non-recoverable timeout */
1621                 GOTO(out, rc = -ETIMEDOUT);
1622         }
1623
1624         if (!req->rq_replied) {
1625                 /* How can this be? -eeb */
1626                 DEBUG_REQ(D_ERROR, req, "!rq_replied: ");
1627                 LBUG();
1628                 GOTO(out, rc = req->rq_status);
1629         }
1630
1631         rc = after_reply(req);
1632         /* NB may return +ve success rc */
1633         if (req->rq_resend) {
1634                 spin_lock(&imp->imp_lock);
1635                 goto restart;
1636         }
1637
1638  out:
1639         if (req->rq_bulk != NULL) {
1640                 if (rc >= 0) {
1641                         /* success so far.  Note that anything going wrong
1642                          * with bulk now, is EXTREMELY strange, since the
1643                          * server must have believed that the bulk
1644                          * tranferred OK before she replied with success to
1645                          * me. */
1646                         lwi = LWI_TIMEOUT(timeout, NULL, NULL);
1647                         brc = l_wait_event(req->rq_reply_waitq,
1648                                            !ptlrpc_bulk_active(req->rq_bulk),
1649                                            &lwi);
1650                         LASSERT(brc == 0 || brc == -ETIMEDOUT);
1651                         if (brc != 0) {
1652                                 LASSERT(brc == -ETIMEDOUT);
1653                                 DEBUG_REQ(D_ERROR, req, "bulk timed out");
1654                                 rc = brc;
1655                         } else if (!req->rq_bulk->bd_success) {
1656                                 DEBUG_REQ(D_ERROR, req, "bulk transfer failed");
1657                                 rc = -EIO;
1658                         }
1659                 }
1660                 if (rc < 0)
1661                         ptlrpc_unregister_bulk (req);
1662         }
1663
1664         LASSERT(!req->rq_receiving_reply);
1665         req->rq_phase = RQ_PHASE_INTERPRET;
1666
1667         atomic_dec(&imp->imp_inflight);
1668         cfs_waitq_signal(&imp->imp_recovery_waitq);
1669         RETURN(rc);
1670 }
1671
1672 struct ptlrpc_replay_async_args {
1673         int praa_old_state;
1674         int praa_old_status;
1675 };
1676
1677 static int ptlrpc_replay_interpret(struct ptlrpc_request *req,
1678                                     void * data, int rc)
1679 {
1680         struct ptlrpc_replay_async_args *aa = data;
1681         struct obd_import *imp = req->rq_import;
1682
1683         ENTRY;
1684         atomic_dec(&imp->imp_replay_inflight);
1685
1686         if (!req->rq_replied) {
1687                 CERROR("request replay timed out, restarting recovery\n");
1688                 GOTO(out, rc = -ETIMEDOUT);
1689         }
1690
1691         if (lustre_msg_get_type(req->rq_repmsg) == PTL_RPC_MSG_ERR &&
1692             lustre_msg_get_status(req->rq_repmsg) == -ENOTCONN)
1693                 GOTO(out, rc = lustre_msg_get_status(req->rq_repmsg));
1694
1695         /* The transno had better not change over replay. */
1696         LASSERT(lustre_msg_get_transno(req->rq_reqmsg) ==
1697                 lustre_msg_get_transno(req->rq_repmsg));
1698
1699         DEBUG_REQ(D_HA, req, "got rep");
1700
1701         /* let the callback do fixups, possibly including in the request */
1702         if (req->rq_replay_cb)
1703                 req->rq_replay_cb(req);
1704
1705         if (req->rq_replied &&
1706             lustre_msg_get_status(req->rq_repmsg) != aa->praa_old_status) {
1707                 DEBUG_REQ(D_ERROR, req, "status %d, old was %d",
1708                           lustre_msg_get_status(req->rq_repmsg),
1709                           aa->praa_old_status);
1710         } else {
1711                 /* Put it back for re-replay. */
1712                 lustre_msg_set_status(req->rq_repmsg, aa->praa_old_status);
1713         }
1714
1715         spin_lock(&imp->imp_lock);
1716         imp->imp_last_replay_transno = req->rq_transno;
1717         spin_unlock(&imp->imp_lock);
1718
1719         /* continue with recovery */
1720         rc = ptlrpc_import_recovery_state_machine(imp);
1721  out:
1722         req->rq_send_state = aa->praa_old_state;
1723
1724         if (rc != 0)
1725                 /* this replay failed, so restart recovery */
1726                 ptlrpc_connect_import(imp, NULL);
1727
1728         RETURN(rc);
1729 }
1730
1731
1732 int ptlrpc_replay_req(struct ptlrpc_request *req)
1733 {
1734         struct ptlrpc_replay_async_args *aa;
1735         ENTRY;
1736
1737         LASSERT(req->rq_import->imp_state == LUSTRE_IMP_REPLAY);
1738
1739         /* Not handling automatic bulk replay yet (or ever?) */
1740         LASSERT(req->rq_bulk == NULL);
1741
1742         DEBUG_REQ(D_HA, req, "REPLAY");
1743
1744         LASSERT (sizeof (*aa) <= sizeof (req->rq_async_args));
1745         aa = (struct ptlrpc_replay_async_args *)&req->rq_async_args;
1746         memset(aa, 0, sizeof *aa);
1747
1748         /* Prepare request to be resent with ptlrpcd */
1749         aa->praa_old_state = req->rq_send_state;
1750         req->rq_send_state = LUSTRE_IMP_REPLAY;
1751         req->rq_phase = RQ_PHASE_NEW;
1752         aa->praa_old_status = lustre_msg_get_status(req->rq_repmsg);
1753         req->rq_status = 0;
1754
1755         req->rq_interpret_reply = ptlrpc_replay_interpret;
1756         atomic_inc(&req->rq_import->imp_replay_inflight);
1757         ptlrpc_request_addref(req); /* ptlrpcd needs a ref */
1758
1759         ptlrpcd_add_req(req);
1760         RETURN(0);
1761 }
1762
1763 void ptlrpc_abort_inflight(struct obd_import *imp)
1764 {
1765         struct list_head *tmp, *n;
1766         ENTRY;
1767
1768         /* Make sure that no new requests get processed for this import.
1769          * ptlrpc_{queue,set}_wait must (and does) hold imp_lock while testing
1770          * this flag and then putting requests on sending_list or delayed_list.
1771          */
1772         spin_lock(&imp->imp_lock);
1773
1774         /* XXX locking?  Maybe we should remove each request with the list
1775          * locked?  Also, how do we know if the requests on the list are
1776          * being freed at this time?
1777          */
1778         list_for_each_safe(tmp, n, &imp->imp_sending_list) {
1779                 struct ptlrpc_request *req =
1780                         list_entry(tmp, struct ptlrpc_request, rq_list);
1781
1782                 DEBUG_REQ(D_HA, req, "inflight");
1783
1784                 spin_lock (&req->rq_lock);
1785                 if (req->rq_import_generation < imp->imp_generation) {
1786                         req->rq_err = 1;
1787                         ptlrpc_wake_client_req(req);
1788                 }
1789                 spin_unlock (&req->rq_lock);
1790         }
1791
1792         list_for_each_safe(tmp, n, &imp->imp_delayed_list) {
1793                 struct ptlrpc_request *req =
1794                         list_entry(tmp, struct ptlrpc_request, rq_list);
1795
1796                 DEBUG_REQ(D_HA, req, "aborting waiting req");
1797
1798                 spin_lock (&req->rq_lock);
1799                 if (req->rq_import_generation < imp->imp_generation) {
1800                         req->rq_err = 1;
1801                         ptlrpc_wake_client_req(req);
1802                 }
1803                 spin_unlock (&req->rq_lock);
1804         }
1805
1806         /* Last chance to free reqs left on the replay list, but we
1807          * will still leak reqs that haven't committed.  */
1808         if (imp->imp_replayable)
1809                 ptlrpc_free_committed(imp);
1810
1811         spin_unlock(&imp->imp_lock);
1812
1813         EXIT;
1814 }
1815
1816 static __u64 ptlrpc_last_xid = 0;
1817 spinlock_t ptlrpc_last_xid_lock;
1818
1819 __u64 ptlrpc_next_xid(void)
1820 {
1821         __u64 tmp;
1822         spin_lock(&ptlrpc_last_xid_lock);
1823         tmp = ++ptlrpc_last_xid;
1824         spin_unlock(&ptlrpc_last_xid_lock);
1825         return tmp;
1826 }
1827
1828 __u64 ptlrpc_sample_next_xid(void)
1829 {
1830         __u64 tmp;
1831         spin_lock(&ptlrpc_last_xid_lock);
1832         tmp = ptlrpc_last_xid + 1;
1833         spin_unlock(&ptlrpc_last_xid_lock);
1834         return tmp;
1835 }
1836 EXPORT_SYMBOL(ptlrpc_sample_next_xid);