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
 183         sptlrpc_enc_pool_put_pages(desc);
 184
 185         if (desc->bd_export)
 186                 class_export_put(desc->bd_export);
 187         else
 188                 class_import_put(desc->bd_import);
 189
 190         OBD_FREE(desc, offsetof(struct ptlrpc_bulk_desc,
 191                                 bd_iov[desc->bd_max_iov]));
 192         EXIT;
 193 }
 194
 195 void ptlrpc_free_rq_pool(struct ptlrpc_request_pool *pool)
 196 {
 197         struct list_head *l, *tmp;
 198         struct ptlrpc_request *req;
 199
 200         if (!pool)
 201                 return;
 202
 203         list_for_each_safe(l, tmp, &pool->prp_req_list) {
 204                 req = list_entry(l, struct ptlrpc_request, rq_list);
 205                 list_del(&req->rq_list);
 206                 LASSERT(req->rq_reqbuf);
 207                 LASSERT(req->rq_reqbuf_len == pool->prp_rq_size);
 208                 OBD_FREE(req->rq_reqbuf, pool->prp_rq_size);
 209                 OBD_FREE(req, sizeof(*req));
 210         }
 211         OBD_FREE(pool, sizeof(*pool));
 212 }
 213
 214 void ptlrpc_add_rqs_to_pool(struct ptlrpc_request_pool *pool, int num_rq)
 215 {
 216         int i;
 217         int size = 1;
 218
 219         while (size < pool->prp_rq_size + SPTLRPC_MAX_PAYLOAD)
 220                 size <<= 1;
 221
 222         LASSERTF(list_empty(&pool->prp_req_list) || size == pool->prp_rq_size,
 223                  "Trying to change pool size with nonempty pool "
 224                  "from %d to %d bytes\n", pool->prp_rq_size, size);
 225
 226         spin_lock(&pool->prp_lock);
 227         pool->prp_rq_size = size;
 228         for (i = 0; i < num_rq; i++) {
 229                 struct ptlrpc_request *req;
 230                 struct lustre_msg *msg;
 231
 232                 spin_unlock(&pool->prp_lock);
 233                 OBD_ALLOC(req, sizeof(struct ptlrpc_request));
 234                 if (!req)
 235                         return;
 236                 OBD_ALLOC_GFP(msg, size, CFS_ALLOC_STD);
 237                 if (!msg) {
 238                         OBD_FREE(req, sizeof(struct ptlrpc_request));
 239                         return;
 240                 }
 241                 req->rq_reqbuf = msg;
 242                 req->rq_reqbuf_len = size;
 243                 req->rq_pool = pool;
 244                 spin_lock(&pool->prp_lock);
 245                 list_add_tail(&req->rq_list, &pool->prp_req_list);
 246         }
 247         spin_unlock(&pool->prp_lock);
 248         return;
 249 }
 250
 251 struct ptlrpc_request_pool *ptlrpc_init_rq_pool(int num_rq, int msgsize,
 252                                                 void (*populate_pool)(struct ptlrpc_request_pool *, int))
 253 {
 254         struct ptlrpc_request_pool *pool;
 255
 256         OBD_ALLOC(pool, sizeof (struct ptlrpc_request_pool));
 257         if (!pool)
 258                 return NULL;
 259
 260         /* Request next power of two for the allocation, because internally
 261            kernel would do exactly this */
 262
 263         spin_lock_init(&pool->prp_lock);
 264         CFS_INIT_LIST_HEAD(&pool->prp_req_list);
 265         pool->prp_rq_size = msgsize;
 266         pool->prp_populate = populate_pool;
 267
 268         populate_pool(pool, num_rq);
 269
 270         if (list_empty(&pool->prp_req_list)) {
 271                 /* have not allocated a single request for the pool */
 272                 OBD_FREE(pool, sizeof (struct ptlrpc_request_pool));
 273                 pool = NULL;
 274         }
 275         return pool;
 276 }
 277
 278 static struct ptlrpc_request *ptlrpc_prep_req_from_pool(struct ptlrpc_request_pool *pool)
 279 {
 280         struct ptlrpc_request *request;
 281         struct lustre_msg *reqbuf;
 282
 283         if (!pool)
 284                 return NULL;
 285
 286         spin_lock(&pool->prp_lock);
 287
 288         /* See if we have anything in a pool, and bail out if nothing,
 289          * in writeout path, where this matters, this is safe to do, because
 290          * nothing is lost in this case, and when some in-flight requests
 291          * complete, this code will be called again. */
 292         if (unlikely(list_empty(&pool->prp_req_list))) {
 293                 spin_unlock(&pool->prp_lock);
 294                 return NULL;
 295         }
 296
 297         request = list_entry(pool->prp_req_list.next, struct ptlrpc_request,
 298                              rq_list);
 299         list_del(&request->rq_list);
 300         spin_unlock(&pool->prp_lock);
 301
 302         LASSERT(request->rq_reqbuf);
 303         LASSERT(request->rq_pool);
 304
 305         reqbuf = request->rq_reqbuf;
 306         memset(request, 0, sizeof(*request));
 307         request->rq_reqbuf = reqbuf;
 308         request->rq_reqbuf_len = pool->prp_rq_size;
 309         request->rq_pool = pool;
 310         return request;
 311 }
 312
 313 static void __ptlrpc_free_req_to_pool(struct ptlrpc_request *request)
 314 {
 315         struct ptlrpc_request_pool *pool = request->rq_pool;
 316
 317         spin_lock(&pool->prp_lock);
 318         LASSERT(list_empty(&request->rq_list));
 319         list_add_tail(&request->rq_list, &pool->prp_req_list);
 320         spin_unlock(&pool->prp_lock);
 321 }
 322
 323 struct ptlrpc_request *
 324 ptlrpc_prep_req_pool(struct obd_import *imp, __u32 version, int opcode,
 325                      int count, int *lengths, char **bufs,
 326                      struct ptlrpc_request_pool *pool,
 327                      struct ptlrpc_cli_ctx *ctx)
 328 {
 329         struct ptlrpc_request *request = NULL;
 330         int rc;
 331         ENTRY;
 332
 333         /* The obd disconnected */
 334         if (imp == NULL)
 335                 return NULL;
 336
 337         LASSERT(imp != LP_POISON);
 338         LASSERT((unsigned long)imp->imp_client > 0x1000);
 339         LASSERT(imp->imp_client != LP_POISON);
 340
 341         if (pool)
 342                 request = ptlrpc_prep_req_from_pool(pool);
 343
 344         if (!request)
 345                 OBD_ALLOC(request, sizeof(*request));
 346
 347         if (!request) {
 348                 CERROR("request allocation out of memory\n");
 349                 RETURN(NULL);
 350         }
 351
 352         request->rq_import = class_import_get(imp);
 353
 354         if (unlikely(ctx))
 355                 request->rq_cli_ctx = sptlrpc_cli_ctx_get(ctx);
 356         else {
 357                 rc = sptlrpc_req_get_ctx(request);
 358                 if (rc)
 359                         GOTO(out_free, rc);
 360         }
 361
 362         sptlrpc_req_set_flavor(request, opcode);
 363
 364         rc = lustre_pack_request(request, imp->imp_msg_magic, count, lengths,
 365                                  bufs);
 366         if (rc) {
 367                 LASSERT(!request->rq_pool);
 368                 GOTO(out_ctx, rc);
 369         }
 370
 371         lustre_msg_add_version(request->rq_reqmsg, version);
 372
 373         if (imp->imp_server_timeout)
 374                 request->rq_timeout = obd_timeout / 2;
 375         else
 376                 request->rq_timeout = obd_timeout;
 377         request->rq_send_state = LUSTRE_IMP_FULL;
 378         request->rq_type = PTL_RPC_MSG_REQUEST;
 379         request->rq_export = NULL;
 380
 381         request->rq_req_cbid.cbid_fn  = request_out_callback;
 382         request->rq_req_cbid.cbid_arg = request;
 383
 384         request->rq_reply_cbid.cbid_fn  = reply_in_callback;
 385         request->rq_reply_cbid.cbid_arg = request;
 386
 387         request->rq_phase = RQ_PHASE_NEW;
 388
 389         /* XXX FIXME bug 249 */
 390         request->rq_request_portal = imp->imp_client->cli_request_portal;
 391         request->rq_reply_portal = imp->imp_client->cli_reply_portal;
 392
 393         spin_lock_init(&request->rq_lock);
 394         CFS_INIT_LIST_HEAD(&request->rq_list);
 395         CFS_INIT_LIST_HEAD(&request->rq_replay_list);
 396         CFS_INIT_LIST_HEAD(&request->rq_mod_list);
 397         CFS_INIT_LIST_HEAD(&request->rq_ctx_chain);
 398         CFS_INIT_LIST_HEAD(&request->rq_set_chain);
 399         cfs_waitq_init(&request->rq_reply_waitq);
 400         request->rq_xid = ptlrpc_next_xid();
 401         atomic_set(&request->rq_refcount, 1);
 402
 403         lustre_msg_set_opc(request->rq_reqmsg, opcode);
 404         lustre_msg_set_flags(request->rq_reqmsg, 0);
 405
 406         RETURN(request);
 407 out_ctx:
 408         sptlrpc_cli_ctx_put(request->rq_cli_ctx, 1);
 409 out_free:
 410         class_import_put(imp);
 411         if (request->rq_pool)
 412                 __ptlrpc_free_req_to_pool(request);
 413         else
 414                 OBD_FREE(request, sizeof(*request));
 415         return NULL;
 416 }
 417
 418 struct ptlrpc_request *
 419 ptlrpc_prep_req(struct obd_import *imp, __u32 version, int opcode, int count,
 420                 int *lengths, char **bufs)
 421 {
 422         return ptlrpc_prep_req_pool(imp, version, opcode, count, lengths, bufs,
 423                                     NULL, NULL);
 424 }
 425
 426 struct ptlrpc_request_set *ptlrpc_prep_set(void)
 427 {
 428         struct ptlrpc_request_set *set;
 429
 430         ENTRY;
 431         OBD_ALLOC(set, sizeof *set);
 432         if (!set)
 433                 RETURN(NULL);
 434         CFS_INIT_LIST_HEAD(&set->set_requests);
 435         cfs_waitq_init(&set->set_waitq);
 436         set->set_remaining = 0;
 437         spin_lock_init(&set->set_new_req_lock);
 438         CFS_INIT_LIST_HEAD(&set->set_new_requests);
 439
 440         RETURN(set);
 441 }
 442
 443 /* Finish with this set; opposite of prep_set. */
 444 void ptlrpc_set_destroy(struct ptlrpc_request_set *set)
 445 {
 446         struct list_head *tmp;
 447         struct list_head *next;
 448         int               expected_phase;
 449         int               n = 0;
 450         ENTRY;
 451
 452         /* Requests on the set should either all be completed, or all be new */
 453         expected_phase = (set->set_remaining == 0) ?
 454                          RQ_PHASE_COMPLETE : RQ_PHASE_NEW;
 455         list_for_each (tmp, &set->set_requests) {
 456                 struct ptlrpc_request *req =
 457                         list_entry(tmp, struct ptlrpc_request, rq_set_chain);
 458
 459                 LASSERT(req->rq_phase == expected_phase);
 460                 n++;
 461         }
 462
 463         LASSERT(set->set_remaining == 0 || set->set_remaining == n);
 464
 465         list_for_each_safe(tmp, next, &set->set_requests) {
 466                 struct ptlrpc_request *req =
 467                         list_entry(tmp, struct ptlrpc_request, rq_set_chain);
 468                 list_del_init(&req->rq_set_chain);
 469
 470                 LASSERT(req->rq_phase == expected_phase);
 471
 472                 if (req->rq_phase == RQ_PHASE_NEW) {
 473
 474                         if (req->rq_interpret_reply != NULL) {
 475                                 int (*interpreter)(struct ptlrpc_request *,
 476                                                    void *, int) =
 477                                         req->rq_interpret_reply;
 478
 479                                 /* higher level (i.e. LOV) failed;
 480                                  * let the sub reqs clean up */
 481                                 req->rq_status = -EBADR;
 482                                 interpreter(req, &req->rq_async_args,
 483                                             req->rq_status);
 484                         }
 485                         set->set_remaining--;
 486                 }
 487
 488                 req->rq_set = NULL;
 489                 ptlrpc_req_finished (req);
 490         }
 491
 492         LASSERT(set->set_remaining == 0);
 493
 494         OBD_FREE(set, sizeof(*set));
 495         EXIT;
 496 }
 497
 498 void ptlrpc_set_add_req(struct ptlrpc_request_set *set,
 499                         struct ptlrpc_request *req)
 500 {
 501         /* The set takes over the caller's request reference */
 502         list_add_tail(&req->rq_set_chain, &set->set_requests);
 503         req->rq_set = set;
 504         set->set_remaining++;
 505
 506         atomic_inc(&req->rq_import->imp_inflight);
 507 }
 508
 509 /* lock so many callers can add things, the context that owns the set
 510  * is supposed to notice these and move them into the set proper. */
 511 void ptlrpc_set_add_new_req(struct ptlrpc_request_set *set,
 512                             struct ptlrpc_request *req)
 513 {
 514         spin_lock(&set->set_new_req_lock);
 515         /* The set takes over the caller's request reference */
 516         list_add_tail(&req->rq_set_chain, &set->set_new_requests);
 517         req->rq_set = set;
 518         spin_unlock(&set->set_new_req_lock);
 519 }
 520
 521 /*
 522  * Based on the current state of the import, determine if the request
 523  * can be sent, is an error, or should be delayed.
 524  *
 525  * Returns true if this request should be delayed. If false, and
 526  * *status is set, then the request can not be sent and *status is the
 527  * error code.  If false and status is 0, then request can be sent.
 528  *
 529  * The imp->imp_lock must be held.
 530  */
 531 static int ptlrpc_import_delay_req(struct obd_import *imp,
 532                                    struct ptlrpc_request *req, int *status)
 533 {
 534         int delay = 0;
 535         ENTRY;
 536
 537         LASSERT (status != NULL);
 538         *status = 0;
 539
 540         if (req->rq_ctx_init || req->rq_ctx_fini) {
 541                 /* always allow ctx init/fini rpc go through */
 542         } else if (imp->imp_state == LUSTRE_IMP_NEW) {
 543                 DEBUG_REQ(D_ERROR, req, "Uninitialized import.");
 544                 *status = -EIO;
 545                 LBUG();
 546         } else if (imp->imp_state == LUSTRE_IMP_CLOSED) {
 547                 DEBUG_REQ(D_ERROR, req, "IMP_CLOSED ");
 548                 *status = -EIO;
 549         } else if (req->rq_send_state == LUSTRE_IMP_CONNECTING &&
 550                  imp->imp_state == LUSTRE_IMP_CONNECTING) {
 551                 /* allow CONNECT even if import is invalid */ ;
 552         } else if (imp->imp_invalid) {
 553                 /* If the import has been invalidated (such as by an OST
 554                  * failure), the request must fail with -EIO. */
 555                 if (!imp->imp_deactive)
 556                         DEBUG_REQ(D_ERROR, req, "IMP_INVALID");
 557                 *status = -EIO;
 558         } else if (req->rq_import_generation != imp->imp_generation) {
 559                 DEBUG_REQ(D_ERROR, req, "req wrong generation:");
 560                 *status = -EIO;
 561         } else if (req->rq_send_state != imp->imp_state) {
 562                 if (imp->imp_obd->obd_no_recov || imp->imp_dlm_fake ||
 563                     req->rq_no_delay)
 564                         *status = -EWOULDBLOCK;
 565                 else
 566                         delay = 1;
 567         }
 568
 569         RETURN(delay);
 570 }
 571
 572 static int ptlrpc_check_reply(struct ptlrpc_request *req)
 573 {
 574         int rc = 0;
 575         ENTRY;
 576
 577         /* serialise with network callback */
 578         spin_lock(&req->rq_lock);
 579
 580         if (req->rq_replied)
 581                 GOTO(out, rc = 1);
 582
 583         if (req->rq_net_err && !req->rq_timedout) {
 584                 spin_unlock(&req->rq_lock);
 585                 rc = ptlrpc_expire_one_request(req);
 586                 spin_lock(&req->rq_lock);
 587                 GOTO(out, rc);
 588         }
 589
 590         if (req->rq_err)
 591                 GOTO(out, rc = 1);
 592
 593         if (req->rq_resend)
 594                 GOTO(out, rc = 1);
 595
 596         if (req->rq_restart)
 597                 GOTO(out, rc = 1);
 598         EXIT;
 599  out:
 600         spin_unlock(&req->rq_lock);
 601         DEBUG_REQ(D_NET, req, "rc = %d for", rc);
 602         return rc;
 603 }
 604
 605 static int ptlrpc_check_status(struct ptlrpc_request *req)
 606 {
 607         int err;
 608         ENTRY;
 609
 610         err = lustre_msg_get_status(req->rq_repmsg);
 611         if (lustre_msg_get_type(req->rq_repmsg) == PTL_RPC_MSG_ERR) {
 612                 struct obd_import *imp = req->rq_import;
 613                 __u32 opc = lustre_msg_get_opc(req->rq_reqmsg);
 614                 LCONSOLE_ERROR_MSG(0x011,"an error occurred while communicating"
 615                                 " with %s. The %s operation failed with %d\n",
 616                                 libcfs_nid2str(imp->imp_connection->c_peer.nid),
 617                                 ll_opcode2str(opc), err);
 618                 RETURN(err < 0 ? err : -EINVAL);
 619         }
 620
 621         if (err < 0) {
 622                 DEBUG_REQ(D_INFO, req, "status is %d", err);
 623         } else if (err > 0) {
 624                 /* XXX: translate this error from net to host */
 625                 DEBUG_REQ(D_INFO, req, "status is %d", err);
 626         }
 627
 628         RETURN(err);
 629 }
 630
 631 static int after_reply(struct ptlrpc_request *req)
 632 {
 633         struct obd_import *imp = req->rq_import;
 634         int rc;
 635         ENTRY;
 636
 637         LASSERT(!req->rq_receiving_reply);
 638         LASSERT(req->rq_nob_received <= req->rq_repbuf_len);
 639
 640         /* NB Until this point, the whole of the incoming message,
 641          * including buflens, status etc is in the sender's byte order. */
 642
 643         /* Clear reply swab mask; this is a new reply in sender's byte order */
 644         req->rq_rep_swab_mask = 0;
 645
 646         rc = sptlrpc_cli_unwrap_reply(req);
 647         if (rc) {
 648                 DEBUG_REQ(D_ERROR, req, "unwrap reply failed (%d):", rc);
 649                 RETURN(rc);
 650         }
 651
 652         /* security layer unwrap might ask resend this request */
 653         if (req->rq_resend)
 654                 RETURN(0);
 655
 656         rc = lustre_unpack_msg(req->rq_repmsg, req->rq_replen);
 657         if (rc) {
 658                 DEBUG_REQ(D_ERROR, req, "unpack_rep failed: %d", rc);
 659                 RETURN(-EPROTO);
 660         }
 661
 662         rc = lustre_unpack_rep_ptlrpc_body(req, MSG_PTLRPC_BODY_OFF);
 663         if (rc) {
 664                 DEBUG_REQ(D_ERROR, req, "unpack ptlrpc body failed: %d", rc);
 665                 RETURN(-EPROTO);
 666         }
 667
 668         if (lustre_msg_get_type(req->rq_repmsg) != PTL_RPC_MSG_REPLY &&
 669             lustre_msg_get_type(req->rq_repmsg) != PTL_RPC_MSG_ERR) {
 670                 DEBUG_REQ(D_ERROR, req, "invalid packet received (type=%u)",
 671                           lustre_msg_get_type(req->rq_repmsg));
 672                 RETURN(-EPROTO);
 673         }
 674
 675         rc = ptlrpc_check_status(req);
 676         imp->imp_connect_error = rc;
 677
 678         if (rc) {
 679                 /* Either we've been evicted, or the server has failed for
 680                  * some reason. Try to reconnect, and if that fails, punt to
 681                  * the upcall. */
 682                 if (ll_rpc_recoverable_error(rc)) {
 683                         if (req->rq_send_state != LUSTRE_IMP_FULL ||
 684                             imp->imp_obd->obd_no_recov || imp->imp_dlm_fake) {
 685                                 RETURN(rc);
 686                         }
 687                         ptlrpc_request_handle_notconn(req);
 688                         RETURN(rc);
 689                 }
 690         } else {
 691                 /* Let's look if server send slv. Do it only for RPC with
 692                  * rc == 0. */
 693                 if (imp->imp_obd->obd_namespace) {
 694                         /* Disconnect rpc is sent when namespace is already
 695                          * destroyed. Let's check this and will not try update
 696                          * pool. */
 697                         ldlm_cli_update_pool(req);
 698                 }
 699         }
 700
 701         /* Store transno in reqmsg for replay. */
 702         req->rq_transno = lustre_msg_get_transno(req->rq_repmsg);
 703         lustre_msg_set_transno(req->rq_reqmsg, req->rq_transno);
 704
 705         if (req->rq_import->imp_replayable) {
 706                 spin_lock(&imp->imp_lock);
 707                 /* no point in adding already-committed requests to the replay
 708                  * list, we will just remove them immediately. b=9829 */
 709                 if (req->rq_transno != 0 &&
 710                     (req->rq_transno >
 711                      lustre_msg_get_last_committed(req->rq_repmsg) ||
 712                      req->rq_replay))
 713                         ptlrpc_retain_replayable_request(req, imp);
 714                 else if (req->rq_commit_cb != NULL) {
 715                         spin_unlock(&imp->imp_lock);
 716                         req->rq_commit_cb(req);
 717                         spin_lock(&imp->imp_lock);
 718                 }
 719
 720                 /* Replay-enabled imports return commit-status information. */
 721                 if (lustre_msg_get_last_committed(req->rq_repmsg)) {
 722                         imp->imp_peer_committed_transno =
 723                                 lustre_msg_get_last_committed(req->rq_repmsg);
 724                 }
 725                 ptlrpc_free_committed(imp);
 726                 spin_unlock(&imp->imp_lock);
 727         }
 728
 729         RETURN(rc);
 730 }
 731
 732 static int ptlrpc_send_new_req(struct ptlrpc_request *req)
 733 {
 734         struct obd_import     *imp;
 735         int rc;
 736         ENTRY;
 737
 738         LASSERT(req->rq_phase == RQ_PHASE_NEW);
 739         if (req->rq_sent && (req->rq_sent > CURRENT_SECONDS))
 740                 RETURN (0);
 741
 742         req->rq_phase = RQ_PHASE_RPC;
 743
 744         imp = req->rq_import;
 745         spin_lock(&imp->imp_lock);
 746
 747         req->rq_import_generation = imp->imp_generation;
 748
 749         if (ptlrpc_import_delay_req(imp, req, &rc)) {
 750                 spin_lock (&req->rq_lock);
 751                 req->rq_waiting = 1;
 752                 spin_unlock (&req->rq_lock);
 753
 754                 DEBUG_REQ(D_HA, req, "req from PID %d waiting for recovery: "
 755                           "(%s != %s)",
 756                           lustre_msg_get_status(req->rq_reqmsg) ,
 757                           ptlrpc_import_state_name(req->rq_send_state),
 758                           ptlrpc_import_state_name(imp->imp_state));
 759                 LASSERT(list_empty (&req->rq_list));
 760
 761                 list_add_tail(&req->rq_list, &imp->imp_delayed_list);
 762                 spin_unlock(&imp->imp_lock);
 763                 RETURN(0);
 764         }
 765
 766         if (rc != 0) {
 767                 spin_unlock(&imp->imp_lock);
 768                 req->rq_status = rc;
 769                 req->rq_phase = RQ_PHASE_INTERPRET;
 770                 RETURN(rc);
 771         }
 772
 773         /* XXX this is the same as ptlrpc_queue_wait */
 774         LASSERT(list_empty(&req->rq_list));
 775         list_add_tail(&req->rq_list, &imp->imp_sending_list);
 776         spin_unlock(&imp->imp_lock);
 777
 778         lustre_msg_set_status(req->rq_reqmsg, cfs_curproc_pid());
 779
 780         rc = sptlrpc_req_refresh_ctx(req, -1);
 781         if (rc) {
 782                 if (req->rq_err) {
 783                         req->rq_status = rc;
 784                         RETURN(1);
 785                 } else {
 786                         /* here begins timeout counting */
 787                         req->rq_sent = CURRENT_SECONDS;
 788                         req->rq_wait_ctx = 1;
 789                         RETURN(0);
 790                 }
 791         }
 792
 793         CDEBUG(D_RPCTRACE, "Sending RPC pname:cluuid:pid:xid:nid:opc"
 794                " %s:%s:%d:"LPU64":%s:%d\n", cfs_curproc_comm(),
 795                imp->imp_obd->obd_uuid.uuid,
 796                lustre_msg_get_status(req->rq_reqmsg), req->rq_xid,
 797                libcfs_nid2str(imp->imp_connection->c_peer.nid),
 798                lustre_msg_get_opc(req->rq_reqmsg));
 799
 800         rc = ptl_send_rpc(req, 0);
 801         if (rc) {
 802                 DEBUG_REQ(D_HA, req, "send failed (%d); expect timeout", rc);
 803                 req->rq_net_err = 1;
 804                 RETURN(rc);
 805         }
 806         RETURN(0);
 807 }
 808
 809 /* this sends any unsent RPCs in @set and returns TRUE if all are sent */
 810 int ptlrpc_check_set(struct ptlrpc_request_set *set)
 811 {
 812         struct list_head *tmp;
 813         int force_timer_recalc = 0;
 814         ENTRY;
 815
 816         if (set->set_remaining == 0)
 817                 RETURN(1);
 818
 819         list_for_each(tmp, &set->set_requests) {
 820                 struct ptlrpc_request *req =
 821                         list_entry(tmp, struct ptlrpc_request, rq_set_chain);
 822                 struct obd_import *imp = req->rq_import;
 823                 int rc = 0;
 824
 825                 if (req->rq_phase == RQ_PHASE_NEW &&
 826                     ptlrpc_send_new_req(req)) {
 827                         force_timer_recalc = 1;
 828                 }
 829                 /* delayed send - skip */
 830                 if (req->rq_phase == RQ_PHASE_NEW && req->rq_sent)
 831                         continue;
 832
 833                 if (!(req->rq_phase == RQ_PHASE_RPC ||
 834                       req->rq_phase == RQ_PHASE_BULK ||
 835                       req->rq_phase == RQ_PHASE_INTERPRET ||
 836                       req->rq_phase == RQ_PHASE_COMPLETE)) {
 837                         DEBUG_REQ(D_ERROR, req, "bad phase %x", req->rq_phase);
 838                         LBUG();
 839                 }
 840
 841                 if (req->rq_phase == RQ_PHASE_COMPLETE)
 842                         continue;
 843
 844                 if (req->rq_phase == RQ_PHASE_INTERPRET)
 845                         GOTO(interpret, req->rq_status);
 846
 847                 if (req->rq_net_err && !req->rq_timedout)
 848                         ptlrpc_expire_one_request(req);
 849
 850                 if (req->rq_err) {
 851                         ptlrpc_unregister_reply(req);
 852                         req->rq_replied = 0;
 853                         if (req->rq_status == 0)
 854                                 req->rq_status = -EIO;
 855                         req->rq_phase = RQ_PHASE_INTERPRET;
 856
 857                         spin_lock(&imp->imp_lock);
 858                         list_del_init(&req->rq_list);
 859                         spin_unlock(&imp->imp_lock);
 860
 861                         GOTO(interpret, req->rq_status);
 862                 }
 863
 864                 /* ptlrpc_queue_wait->l_wait_event guarantees that rq_intr
 865                  * will only be set after rq_timedout, but the oig waiting
 866                  * path sets rq_intr irrespective of whether ptlrpcd has
 867                  * seen a timeout.  our policy is to only interpret
 868                  * interrupted rpcs after they have timed out */
 869                 if (req->rq_intr && (req->rq_timedout || req->rq_waiting ||
 870                                      req->rq_wait_ctx)) {
 871                         /* NB could be on delayed list */
 872                         ptlrpc_unregister_reply(req);
 873                         req->rq_status = -EINTR;
 874                         req->rq_phase = RQ_PHASE_INTERPRET;
 875
 876                         spin_lock(&imp->imp_lock);
 877                         list_del_init(&req->rq_list);
 878                         spin_unlock(&imp->imp_lock);
 879
 880                         GOTO(interpret, req->rq_status);
 881                 }
 882
 883                 if (req->rq_phase == RQ_PHASE_RPC) {
 884                         if (req->rq_timedout || req->rq_resend ||
 885                             req->rq_waiting || req->rq_wait_ctx) {
 886                                 int status;
 887
 888                                 /* rq_wait_ctx is only touched in ptlrpcd,
 889                                  * no lock needed here.
 890                                  */
 891                                 if (req->rq_wait_ctx)
 892                                         goto check_ctx;
 893
 894                                 ptlrpc_unregister_reply(req);
 895
 896                                 spin_lock(&imp->imp_lock);
 897
 898                                 if (ptlrpc_import_delay_req(imp, req, &status)){
 899                                         spin_unlock(&imp->imp_lock);
 900                                         continue;
 901                                 }
 902
 903                                 list_del_init(&req->rq_list);
 904                                 if (status != 0)  {
 905                                         req->rq_status = status;
 906                                         req->rq_phase = RQ_PHASE_INTERPRET;
 907                                         spin_unlock(&imp->imp_lock);
 908                                         GOTO(interpret, req->rq_status);
 909                                 }
 910                                 if (req->rq_no_resend && !req->rq_wait_ctx) {
 911                                         req->rq_status = -ENOTCONN;
 912                                         req->rq_phase = RQ_PHASE_INTERPRET;
 913                                         spin_unlock(&imp->imp_lock);
 914                                         GOTO(interpret, req->rq_status);
 915                                 }
 916                                 list_add_tail(&req->rq_list,
 917                                               &imp->imp_sending_list);
 918
 919                                 spin_unlock(&imp->imp_lock);
 920
 921                                 req->rq_waiting = 0;
 922                                 if (req->rq_resend) {
 923                                         lustre_msg_add_flags(req->rq_reqmsg,
 924                                                              MSG_RESENT);
 925                                         if (req->rq_bulk) {
 926                                                 __u64 old_xid = req->rq_xid;
 927
 928                                                 ptlrpc_unregister_bulk (req);
 929
 930                                                 /* ensure previous bulk fails */
 931                                                 req->rq_xid = ptlrpc_next_xid();
 932                                                 CDEBUG(D_HA, "resend bulk "
 933                                                        "old x"LPU64
 934                                                        " new x"LPU64"\n",
 935                                                        old_xid, req->rq_xid);
 936                                         }
 937                                 }
 938 check_ctx:
 939                                 status = sptlrpc_req_refresh_ctx(req, -1);
 940                                 if (status) {
 941                                         if (req->rq_err) {
 942                                                 req->rq_status = status;
 943                                                 force_timer_recalc = 1;
 944                                         }
 945                                         if (!req->rq_wait_ctx) {
 946                                                 /* begins timeout counting */
 947                                                 req->rq_sent = CURRENT_SECONDS;
 948                                                 req->rq_wait_ctx = 1;
 949                                         }
 950                                         continue;
 951                                 } else {
 952                                         req->rq_sent = 0;
 953                                         req->rq_wait_ctx = 0;
 954                                 }
 955
 956                                 rc = ptl_send_rpc(req, 0);
 957                                 if (rc) {
 958                                         DEBUG_REQ(D_HA, req, "send failed (%d)",
 959                                                   rc);
 960                                         force_timer_recalc = 1;
 961                                         req->rq_net_err = 1;
 962                                 }
 963                                 /* need to reset the timeout */
 964                                 force_timer_recalc = 1;
 965                         }
 966
 967                         /* Still waiting for a reply? */
 968                         if (ptlrpc_client_receiving_reply(req))
 969                                 continue;
 970
 971                         /* Did we actually receive a reply? */
 972                         if (!ptlrpc_client_replied(req))
 973                                 continue;
 974
 975                         spin_lock(&imp->imp_lock);
 976                         list_del_init(&req->rq_list);
 977                         spin_unlock(&imp->imp_lock);
 978
 979                         req->rq_status = after_reply(req);
 980                         if (req->rq_resend) {
 981                                 /* Add this req to the delayed list so
 982                                    it can be errored if the import is
 983                                    evicted after recovery. */
 984                                 spin_lock(&imp->imp_lock);
 985                                 list_add_tail(&req->rq_list,
 986                                               &imp->imp_delayed_list);
 987                                 spin_unlock(&imp->imp_lock);
 988                                 continue;
 989                         }
 990
 991                         /* If there is no bulk associated with this request,
 992                          * then we're done and should let the interpreter
 993                          * process the reply.  Similarly if the RPC returned
 994                          * an error, and therefore the bulk will never arrive.
 995                          */
 996                         if (req->rq_bulk == NULL || req->rq_status != 0) {
 997                                 req->rq_phase = RQ_PHASE_INTERPRET;
 998                                 GOTO(interpret, req->rq_status);
 999                         }
1000
1001                         req->rq_phase = RQ_PHASE_BULK;
1002                 }
1003
1004                 LASSERT(req->rq_phase == RQ_PHASE_BULK);
1005                 if (ptlrpc_bulk_active(req->rq_bulk))
1006                         continue;
1007
1008                 if (!req->rq_bulk->bd_success) {
1009                         /* The RPC reply arrived OK, but the bulk screwed
1010                          * up!  Dead wierd since the server told us the RPC
1011                          * was good after getting the REPLY for her GET or
1012                          * the ACK for her PUT. */
1013                         DEBUG_REQ(D_ERROR, req, "bulk transfer failed");
1014                         LBUG();
1015                 }
1016
1017                 req->rq_phase = RQ_PHASE_INTERPRET;
1018
1019         interpret:
1020                 LASSERT(req->rq_phase == RQ_PHASE_INTERPRET);
1021                 LASSERT(!req->rq_receiving_reply);
1022
1023                 ptlrpc_unregister_reply(req);
1024                 if (req->rq_bulk != NULL)
1025                         ptlrpc_unregister_bulk (req);
1026
1027                 req->rq_phase = RQ_PHASE_COMPLETE;
1028
1029                 if (req->rq_interpret_reply != NULL) {
1030                         int (*interpreter)(struct ptlrpc_request *,void *,int) =
1031                                 req->rq_interpret_reply;
1032                         req->rq_status = interpreter(req, &req->rq_async_args,
1033                                                      req->rq_status);
1034                 }
1035
1036                 CDEBUG(D_RPCTRACE, "Completed RPC pname:cluuid:pid:xid:nid:"
1037                        "opc %s:%s:%d:"LPU64":%s:%d\n", cfs_curproc_comm(),
1038                        imp->imp_obd->obd_uuid.uuid,
1039                        lustre_msg_get_status(req->rq_reqmsg), req->rq_xid,
1040                        libcfs_nid2str(imp->imp_connection->c_peer.nid),
1041                        lustre_msg_get_opc(req->rq_reqmsg));
1042
1043                 set->set_remaining--;
1044
1045                 atomic_dec(&imp->imp_inflight);
1046                 cfs_waitq_signal(&imp->imp_recovery_waitq);
1047         }
1048
1049         /* If we hit an error, we want to recover promptly. */
1050         RETURN(set->set_remaining == 0 || force_timer_recalc);
1051 }
1052
1053 int ptlrpc_expire_one_request(struct ptlrpc_request *req)
1054 {
1055         struct obd_import *imp = req->rq_import;
1056         int rc = 0;
1057         ENTRY;
1058
1059         DEBUG_REQ(D_ERROR|D_NETERROR, req, "%s (sent at %lu, %lus ago)",
1060                   req->rq_net_err ? "network error" : "timeout",
1061                   (long)req->rq_sent, CURRENT_SECONDS - req->rq_sent);
1062
1063         if (imp != NULL && obd_debug_peer_on_timeout)
1064                 LNetCtl(IOC_LIBCFS_DEBUG_PEER, &imp->imp_connection->c_peer);
1065
1066         spin_lock(&req->rq_lock);
1067         req->rq_timedout = 1;
1068         req->rq_wait_ctx = 0;
1069         spin_unlock(&req->rq_lock);
1070
1071         ptlrpc_unregister_reply (req);
1072
1073         if (obd_dump_on_timeout)
1074                 libcfs_debug_dumplog();
1075
1076         if (req->rq_bulk != NULL)
1077                 ptlrpc_unregister_bulk (req);
1078
1079         if (imp == NULL) {
1080                 DEBUG_REQ(D_HA, req, "NULL import: already cleaned up?");
1081                 RETURN(1);
1082         }
1083
1084         /* The DLM server doesn't want recovery run on its imports. */
1085         if (imp->imp_dlm_fake)
1086                 RETURN(1);
1087
1088         /* If this request is for recovery or other primordial tasks,
1089          * then error it out here. */
1090         if (req->rq_ctx_init || req->rq_ctx_fini ||
1091             req->rq_send_state != LUSTRE_IMP_FULL ||
1092             imp->imp_obd->obd_no_recov) {
1093                 spin_lock(&req->rq_lock);
1094                 req->rq_status = -ETIMEDOUT;
1095                 req->rq_err = 1;
1096                 spin_unlock(&req->rq_lock);
1097                 RETURN(1);
1098         }
1099
1100         /* if request can't be resend we can't wait answer after timeout */
1101         if (req->rq_no_resend) {
1102                 DEBUG_REQ(D_RPCTRACE, req, "TIMEOUT-NORESEND:");
1103                 rc = 1;
1104         }
1105
1106         ptlrpc_fail_import(imp, lustre_msg_get_conn_cnt(req->rq_reqmsg));
1107
1108         RETURN(rc);
1109 }
1110
1111 int ptlrpc_expired_set(void *data)
1112 {
1113         struct ptlrpc_request_set *set = data;
1114         struct list_head          *tmp;
1115         time_t                     now = CURRENT_SECONDS;
1116         ENTRY;
1117
1118         LASSERT(set != NULL);
1119
1120         /* A timeout expired; see which reqs it applies to... */
1121         list_for_each (tmp, &set->set_requests) {
1122                 struct ptlrpc_request *req =
1123                         list_entry(tmp, struct ptlrpc_request, rq_set_chain);
1124
1125                 /* request in-flight? */
1126                 if (!((req->rq_phase == RQ_PHASE_RPC && !req->rq_waiting &&
1127                        !req->rq_resend) ||
1128                       (req->rq_phase == RQ_PHASE_BULK)))
1129                         continue;
1130
1131                 if (req->rq_timedout ||           /* already dealt with */
1132                     req->rq_sent + req->rq_timeout > now) /* not expired */
1133                         continue;
1134
1135                 /* deal with this guy */
1136                 ptlrpc_expire_one_request (req);
1137         }
1138
1139         /* When waiting for a whole set, we always to break out of the
1140          * sleep so we can recalculate the timeout, or enable interrupts
1141          * iff everyone's timed out.
1142          */
1143         RETURN(1);
1144 }
1145
1146 void ptlrpc_mark_interrupted(struct ptlrpc_request *req)
1147 {
1148         spin_lock(&req->rq_lock);
1149         req->rq_intr = 1;
1150         spin_unlock(&req->rq_lock);
1151 }
1152
1153 void ptlrpc_interrupted_set(void *data)
1154 {
1155         struct ptlrpc_request_set *set = data;
1156         struct list_head *tmp;
1157
1158         LASSERT(set != NULL);
1159         CERROR("INTERRUPTED SET %p\n", set);
1160
1161         list_for_each(tmp, &set->set_requests) {
1162                 struct ptlrpc_request *req =
1163                         list_entry(tmp, struct ptlrpc_request, rq_set_chain);
1164
1165                 if (req->rq_phase != RQ_PHASE_RPC)
1166                         continue;
1167
1168                 ptlrpc_mark_interrupted(req);
1169         }
1170 }
1171
1172 int ptlrpc_set_next_timeout(struct ptlrpc_request_set *set)
1173 {
1174         struct list_head      *tmp;
1175         time_t                 now = CURRENT_SECONDS;
1176         time_t                 deadline;
1177         int                    timeout = 0;
1178         struct ptlrpc_request *req;
1179         ENTRY;
1180
1181         SIGNAL_MASK_ASSERT(); /* XXX BUG 1511 */
1182
1183         list_for_each(tmp, &set->set_requests) {
1184                 req = list_entry(tmp, struct ptlrpc_request, rq_set_chain);
1185
1186                 /* request in-flight? */
1187                 if (!((req->rq_phase == RQ_PHASE_RPC && !req->rq_waiting) ||
1188                       (req->rq_phase == RQ_PHASE_BULK) ||
1189                       (req->rq_phase == RQ_PHASE_NEW)))
1190                         continue;
1191
1192                 if (req->rq_timedout)   /* already timed out */
1193                         continue;
1194
1195                 if (req->rq_phase == RQ_PHASE_NEW)
1196                         deadline = req->rq_sent;
1197                 else
1198                         deadline = req->rq_sent + req->rq_timeout;
1199
1200                 if (deadline <= now)    /* actually expired already */
1201                         timeout = 1;    /* ASAP */
1202                 else if (timeout == 0 || timeout > deadline - now)
1203                         timeout = deadline - now;
1204         }
1205         RETURN(timeout);
1206 }
1207
1208 int ptlrpc_set_wait(struct ptlrpc_request_set *set)
1209 {
1210         struct list_head      *tmp;
1211         struct ptlrpc_request *req;
1212         struct l_wait_info     lwi;
1213         int                    rc, timeout;
1214         ENTRY;
1215
1216         if (list_empty(&set->set_requests))
1217                 RETURN(0);
1218
1219         list_for_each(tmp, &set->set_requests) {
1220                 req = list_entry(tmp, struct ptlrpc_request, rq_set_chain);
1221                 if (req->rq_phase == RQ_PHASE_NEW)
1222                         (void)ptlrpc_send_new_req(req);
1223         }
1224
1225         do {
1226                 timeout = ptlrpc_set_next_timeout(set);
1227
1228                 /* wait until all complete, interrupted, or an in-flight
1229                  * req times out */
1230                 CDEBUG(D_RPCTRACE, "set %p going to sleep for %d seconds\n",
1231                        set, timeout);
1232                 lwi = LWI_TIMEOUT_INTR(cfs_time_seconds(timeout ? timeout : 1),
1233                                        ptlrpc_expired_set,
1234                                        ptlrpc_interrupted_set, set);
1235                 rc = l_wait_event(set->set_waitq, ptlrpc_check_set(set), &lwi);
1236
1237                 LASSERT(rc == 0 || rc == -EINTR || rc == -ETIMEDOUT);
1238
1239                 /* -EINTR => all requests have been flagged rq_intr so next
1240                  * check completes.
1241                  * -ETIMEOUTD => someone timed out.  When all reqs have
1242                  * timed out, signals are enabled allowing completion with
1243                  * EINTR.
1244                  * I don't really care if we go once more round the loop in
1245                  * the error cases -eeb. */
1246         } while (rc != 0 || set->set_remaining != 0);
1247
1248         LASSERT(set->set_remaining == 0);
1249
1250         rc = 0;
1251         list_for_each(tmp, &set->set_requests) {
1252                 req = list_entry(tmp, struct ptlrpc_request, rq_set_chain);
1253
1254                 LASSERT(req->rq_phase == RQ_PHASE_COMPLETE);
1255                 if (req->rq_status != 0)
1256                         rc = req->rq_status;
1257         }
1258
1259         if (set->set_interpret != NULL) {
1260                 int (*interpreter)(struct ptlrpc_request_set *set,void *,int) =
1261                         set->set_interpret;
1262                 rc = interpreter (set, set->set_arg, rc);
1263         }
1264
1265         RETURN(rc);
1266 }
1267
1268 static void __ptlrpc_free_req(struct ptlrpc_request *request, int locked)
1269 {
1270         ENTRY;
1271         if (request == NULL) {
1272                 EXIT;
1273                 return;
1274         }
1275
1276         LASSERTF(!request->rq_receiving_reply, "req %p\n", request);
1277         LASSERTF(request->rq_rqbd == NULL, "req %p\n",request);/* client-side */
1278         LASSERTF(list_empty(&request->rq_list), "req %p\n", request);
1279         LASSERTF(list_empty(&request->rq_set_chain), "req %p\n", request);
1280         LASSERT(request->rq_cli_ctx);
1281
1282         /* We must take it off the imp_replay_list first.  Otherwise, we'll set
1283          * request->rq_reqmsg to NULL while osc_close is dereferencing it. */
1284         if (request->rq_import != NULL) {
1285                 if (!locked)
1286                         spin_lock(&request->rq_import->imp_lock);
1287                 list_del_init(&request->rq_mod_list);
1288                 list_del_init(&request->rq_replay_list);
1289                 if (!locked)
1290                         spin_unlock(&request->rq_import->imp_lock);
1291         }
1292         LASSERTF(list_empty(&request->rq_replay_list), "req %p\n", request);
1293
1294         if (atomic_read(&request->rq_refcount) != 0) {
1295                 DEBUG_REQ(D_ERROR, request,
1296                           "freeing request with nonzero refcount");
1297                 LBUG();
1298         }
1299
1300         if (request->rq_repbuf != NULL)
1301                 sptlrpc_cli_free_repbuf(request);
1302         if (request->rq_export != NULL) {
1303                 class_export_put(request->rq_export);
1304                 request->rq_export = NULL;
1305         }
1306         if (request->rq_import != NULL) {
1307                 class_import_put(request->rq_import);
1308                 request->rq_import = NULL;
1309         }
1310         if (request->rq_bulk != NULL)
1311                 ptlrpc_free_bulk(request->rq_bulk);
1312
1313         if (request->rq_reqbuf != NULL || request->rq_clrbuf != NULL)
1314                 sptlrpc_cli_free_reqbuf(request);
1315
1316         sptlrpc_req_put_ctx(request, !locked);
1317
1318         if (request->rq_pool)
1319                 __ptlrpc_free_req_to_pool(request);
1320         else
1321                 OBD_FREE(request, sizeof(*request));
1322         EXIT;
1323 }
1324
1325 void ptlrpc_free_req(struct ptlrpc_request *request)
1326 {
1327         __ptlrpc_free_req(request, 0);
1328 }
1329
1330 static int __ptlrpc_req_finished(struct ptlrpc_request *request, int locked);
1331 void ptlrpc_req_finished_with_imp_lock(struct ptlrpc_request *request)
1332 {
1333         LASSERT_SPIN_LOCKED(&request->rq_import->imp_lock);
1334         (void)__ptlrpc_req_finished(request, 1);
1335 }
1336
1337 static int __ptlrpc_req_finished(struct ptlrpc_request *request, int locked)
1338 {
1339         ENTRY;
1340         if (request == NULL)
1341                 RETURN(1);
1342
1343         if (request == LP_POISON ||
1344             request->rq_reqmsg == LP_POISON) {
1345                 CERROR("dereferencing freed request (bug 575)\n");
1346                 LBUG();
1347                 RETURN(1);
1348         }
1349
1350         DEBUG_REQ(D_INFO, request, "refcount now %u",
1351                   atomic_read(&request->rq_refcount) - 1);
1352
1353         if (atomic_dec_and_test(&request->rq_refcount)) {
1354                 __ptlrpc_free_req(request, locked);
1355                 RETURN(1);
1356         }
1357
1358         RETURN(0);
1359 }
1360
1361 void ptlrpc_req_finished(struct ptlrpc_request *request)
1362 {
1363         __ptlrpc_req_finished(request, 0);
1364 }
1365
1366 __u64 ptlrpc_req_xid(struct ptlrpc_request *request)
1367 {
1368         return request->rq_xid;
1369 }
1370 EXPORT_SYMBOL(ptlrpc_req_xid);
1371
1372 /* Disengage the client's reply buffer from the network
1373  * NB does _NOT_ unregister any client-side bulk.
1374  * IDEMPOTENT, but _not_ safe against concurrent callers.
1375  * The request owner (i.e. the thread doing the I/O) must call...
1376  */
1377 void ptlrpc_unregister_reply (struct ptlrpc_request *request)
1378 {
1379         int                rc;
1380         cfs_waitq_t       *wq;
1381         struct l_wait_info lwi;
1382
1383         LASSERT(!in_interrupt ());             /* might sleep */
1384
1385         if (!ptlrpc_client_receiving_reply(request))
1386                 return;
1387
1388         LNetMDUnlink (request->rq_reply_md_h);
1389
1390         /* We have to l_wait_event() whatever the result, to give liblustre
1391          * a chance to run reply_in_callback() */
1392
1393         if (request->rq_set != NULL)
1394                 wq = &request->rq_set->set_waitq;
1395         else
1396                 wq = &request->rq_reply_waitq;
1397
1398         for (;;) {
1399                 /* Network access will complete in finite time but the HUGE
1400                  * timeout lets us CWARN for visibility of sluggish NALs */
1401                 lwi = LWI_TIMEOUT(cfs_time_seconds(300), NULL, NULL);
1402                 rc = l_wait_event (*wq, !ptlrpc_client_receiving_reply(request), &lwi);
1403                 if (rc == 0)
1404                         return;
1405
1406                 LASSERT (rc == -ETIMEDOUT);
1407                 DEBUG_REQ(D_WARNING, request, "Unexpectedly long timeout");
1408         }
1409 }
1410
1411 /* caller must hold imp->imp_lock */
1412 void ptlrpc_free_committed(struct obd_import *imp)
1413 {
1414         struct list_head *tmp, *saved;
1415         struct ptlrpc_request *req;
1416         struct ptlrpc_request *last_req = NULL; /* temporary fire escape */
1417         ENTRY;
1418
1419         LASSERT(imp != NULL);
1420
1421         LASSERT_SPIN_LOCKED(&imp->imp_lock);
1422
1423
1424         if (imp->imp_peer_committed_transno == imp->imp_last_transno_checked &&
1425             imp->imp_generation == imp->imp_last_generation_checked) {
1426                 CDEBUG(D_RPCTRACE, "%s: skip recheck: last_committed "LPU64"\n",
1427                        imp->imp_obd->obd_name, imp->imp_peer_committed_transno);
1428                 return;
1429         }
1430
1431         CDEBUG(D_RPCTRACE, "%s: committing for last_committed "LPU64" gen %d\n",
1432                imp->imp_obd->obd_name, imp->imp_peer_committed_transno,
1433                imp->imp_generation);
1434         imp->imp_last_transno_checked = imp->imp_peer_committed_transno;
1435         imp->imp_last_generation_checked = imp->imp_generation;
1436
1437         list_for_each_safe(tmp, saved, &imp->imp_replay_list) {
1438                 req = list_entry(tmp, struct ptlrpc_request, rq_replay_list);
1439
1440                 /* XXX ok to remove when 1357 resolved - rread 05/29/03  */
1441                 LASSERT(req != last_req);
1442                 last_req = req;
1443
1444                 if (req->rq_import_generation < imp->imp_generation) {
1445                         DEBUG_REQ(D_RPCTRACE, req, "free request with old gen");
1446                         GOTO(free_req, 0);
1447                 }
1448
1449                 if (req->rq_replay) {
1450                         DEBUG_REQ(D_RPCTRACE, req, "keeping (FL_REPLAY)");
1451                         continue;
1452                 }
1453
1454                 /* not yet committed */
1455                 if (req->rq_transno > imp->imp_peer_committed_transno) {
1456                         DEBUG_REQ(D_RPCTRACE, req, "stopping search");
1457                         break;
1458                 }
1459
1460                 DEBUG_REQ(D_RPCTRACE, req, "commit (last_committed "LPU64")",
1461                           imp->imp_peer_committed_transno);
1462 free_req:
1463                 spin_lock(&req->rq_lock);
1464                 req->rq_replay = 0;
1465                 spin_unlock(&req->rq_lock);
1466                 if (req->rq_commit_cb != NULL)
1467                         req->rq_commit_cb(req);
1468                 list_del_init(&req->rq_replay_list);
1469                 __ptlrpc_req_finished(req, 1);
1470         }
1471
1472         EXIT;
1473         return;
1474 }
1475
1476 void ptlrpc_cleanup_client(struct obd_import *imp)
1477 {
1478         ENTRY;
1479         EXIT;
1480         return;
1481 }
1482
1483 void ptlrpc_resend_req(struct ptlrpc_request *req)
1484 {
1485         DEBUG_REQ(D_HA, req, "going to resend");
1486         lustre_msg_set_handle(req->rq_reqmsg, &(struct lustre_handle){ 0 });
1487         req->rq_status = -EAGAIN;
1488
1489         spin_lock(&req->rq_lock);
1490         req->rq_resend = 1;
1491         req->rq_net_err = 0;
1492         req->rq_timedout = 0;
1493         if (req->rq_bulk) {
1494                 __u64 old_xid = req->rq_xid;
1495
1496                 /* ensure previous bulk fails */
1497                 req->rq_xid = ptlrpc_next_xid();
1498                 CDEBUG(D_HA, "resend bulk old x"LPU64" new x"LPU64"\n",
1499                        old_xid, req->rq_xid);
1500         }
1501         ptlrpc_wake_client_req(req);
1502         spin_unlock(&req->rq_lock);
1503 }
1504
1505 /* XXX: this function and rq_status are currently unused */
1506 void ptlrpc_restart_req(struct ptlrpc_request *req)
1507 {
1508         DEBUG_REQ(D_HA, req, "restarting (possibly-)completed request");
1509         req->rq_status = -ERESTARTSYS;
1510
1511         spin_lock(&req->rq_lock);
1512         req->rq_restart = 1;
1513         req->rq_timedout = 0;
1514         ptlrpc_wake_client_req(req);
1515         spin_unlock(&req->rq_lock);
1516 }
1517
1518 static int expired_request(void *data)
1519 {
1520         struct ptlrpc_request *req = data;
1521         ENTRY;
1522
1523         /* some failure can suspend regular timeouts */
1524         if (ptlrpc_check_suspend())
1525                 RETURN(1);
1526
1527         RETURN(ptlrpc_expire_one_request(req));
1528 }
1529
1530 static void interrupted_request(void *data)
1531 {
1532         struct ptlrpc_request *req = data;
1533         DEBUG_REQ(D_HA, req, "request interrupted");
1534         spin_lock(&req->rq_lock);
1535         req->rq_intr = 1;
1536         spin_unlock(&req->rq_lock);
1537 }
1538
1539 struct ptlrpc_request *ptlrpc_request_addref(struct ptlrpc_request *req)
1540 {
1541         ENTRY;
1542         atomic_inc(&req->rq_refcount);
1543         RETURN(req);
1544 }
1545
1546 void ptlrpc_retain_replayable_request(struct ptlrpc_request *req,
1547                                       struct obd_import *imp)
1548 {
1549         struct list_head *tmp;
1550
1551         LASSERT_SPIN_LOCKED(&imp->imp_lock);
1552
1553         /* clear this for new requests that were resent as well
1554            as resent replayed requests. */
1555         lustre_msg_clear_flags(req->rq_reqmsg, MSG_RESENT);
1556
1557         /* don't re-add requests that have been replayed */
1558         if (!list_empty(&req->rq_replay_list))
1559                 return;
1560
1561         lustre_msg_add_flags(req->rq_reqmsg, MSG_REPLAY);
1562
1563         LASSERT(imp->imp_replayable);
1564         /* Balanced in ptlrpc_free_committed, usually. */
1565         ptlrpc_request_addref(req);
1566         list_for_each_prev(tmp, &imp->imp_replay_list) {
1567                 struct ptlrpc_request *iter =
1568                         list_entry(tmp, struct ptlrpc_request, rq_replay_list);
1569
1570                 /* We may have duplicate transnos if we create and then
1571                  * open a file, or for closes retained if to match creating
1572                  * opens, so use req->rq_xid as a secondary key.
1573                  * (See bugs 684, 685, and 428.)
1574                  * XXX no longer needed, but all opens need transnos!
1575                  */
1576                 if (iter->rq_transno > req->rq_transno)
1577                         continue;
1578
1579                 if (iter->rq_transno == req->rq_transno) {
1580                         LASSERT(iter->rq_xid != req->rq_xid);
1581                         if (iter->rq_xid > req->rq_xid)
1582                                 continue;
1583                 }
1584
1585                 list_add(&req->rq_replay_list, &iter->rq_replay_list);
1586                 return;
1587         }
1588
1589         list_add_tail(&req->rq_replay_list, &imp->imp_replay_list);
1590 }
1591
1592 int ptlrpc_queue_wait(struct ptlrpc_request *req)
1593 {
1594         int rc = 0;
1595         int brc;
1596         struct l_wait_info lwi;
1597         struct obd_import *imp = req->rq_import;
1598         cfs_duration_t timeout = 0;
1599         ENTRY;
1600
1601         LASSERT(req->rq_set == NULL);
1602         LASSERT(!req->rq_receiving_reply);
1603         atomic_inc(&imp->imp_inflight);
1604
1605         /* for distributed debugging */
1606         lustre_msg_set_status(req->rq_reqmsg, cfs_curproc_pid());
1607         LASSERT(imp->imp_obd != NULL);
1608         CDEBUG(D_RPCTRACE, "Sending RPC pname:cluuid:pid:xid:nid:opc "
1609                "%s:%s:%d:"LPU64":%s:%d\n", cfs_curproc_comm(),
1610                imp->imp_obd->obd_uuid.uuid,
1611                lustre_msg_get_status(req->rq_reqmsg), req->rq_xid,
1612                libcfs_nid2str(imp->imp_connection->c_peer.nid),
1613                lustre_msg_get_opc(req->rq_reqmsg));
1614
1615         /* Mark phase here for a little debug help */
1616         req->rq_phase = RQ_PHASE_RPC;
1617
1618         spin_lock(&imp->imp_lock);
1619         req->rq_import_generation = imp->imp_generation;
1620 restart:
1621         if (ptlrpc_import_delay_req(imp, req, &rc)) {
1622                 list_del(&req->rq_list);
1623
1624                 list_add_tail(&req->rq_list, &imp->imp_delayed_list);
1625                 spin_unlock(&imp->imp_lock);
1626
1627                 DEBUG_REQ(D_HA, req, "\"%s\" waiting for recovery: (%s != %s)",
1628                           cfs_curproc_comm(),
1629                           ptlrpc_import_state_name(req->rq_send_state),
1630                           ptlrpc_import_state_name(imp->imp_state));
1631                 lwi = LWI_INTR(interrupted_request, req);
1632                 rc = l_wait_event(req->rq_reply_waitq,
1633                                   (req->rq_send_state == imp->imp_state ||
1634                                    req->rq_err || req->rq_intr),
1635                                   &lwi);
1636                 DEBUG_REQ(D_HA, req, "\"%s\" awake: (%s == %s or %d/%d == 1)",
1637                           cfs_curproc_comm(),
1638                           ptlrpc_import_state_name(imp->imp_state),
1639                           ptlrpc_import_state_name(req->rq_send_state),
1640                           req->rq_err, req->rq_intr);
1641
1642                 spin_lock(&imp->imp_lock);
1643                 list_del_init(&req->rq_list);
1644
1645                 if (req->rq_err) {
1646                         rc = -EIO;
1647                 }
1648                 else if (req->rq_intr) {
1649                         rc = -EINTR;
1650                 }
1651                 else if (req->rq_no_resend) {
1652                         spin_unlock(&imp->imp_lock);
1653                         GOTO(out, rc = -ETIMEDOUT);
1654                 }
1655                 else {
1656                         GOTO(restart, rc);
1657                 }
1658         }
1659
1660         if (rc != 0) {
1661                 list_del_init(&req->rq_list);
1662                 spin_unlock(&imp->imp_lock);
1663                 req->rq_status = rc; // XXX this ok?
1664                 GOTO(out, rc);
1665         }
1666
1667         if (req->rq_resend) {
1668                 lustre_msg_add_flags(req->rq_reqmsg, MSG_RESENT);
1669
1670                 if (req->rq_bulk != NULL) {
1671                         ptlrpc_unregister_bulk (req);
1672
1673                         /* bulk requests are supposed to be
1674                          * idempotent, so we are free to bump the xid
1675                          * here, which we need to do before
1676                          * registering the bulk again (bug 6371).
1677                          * print the old xid first for sanity.
1678                          */
1679                         DEBUG_REQ(D_HA, req, "bumping xid for bulk: ");
1680                         req->rq_xid = ptlrpc_next_xid();
1681                 }
1682
1683                 DEBUG_REQ(D_HA, req, "resending: ");
1684         }
1685
1686         /* XXX this is the same as ptlrpc_set_wait */
1687         LASSERT(list_empty(&req->rq_list));
1688         list_add_tail(&req->rq_list, &imp->imp_sending_list);
1689         spin_unlock(&imp->imp_lock);
1690
1691         rc = sptlrpc_req_refresh_ctx(req, 0);
1692         if (rc) {
1693                 if (req->rq_err) {
1694                         /* we got fatal ctx refresh error, directly jump out
1695                          * thus we can pass back the actual error code.
1696                          */
1697                         spin_lock(&imp->imp_lock);
1698                         list_del_init(&req->rq_list);
1699                         spin_unlock(&imp->imp_lock);
1700
1701                         CERROR("Failed to refresh ctx of req %p: %d\n", req, rc);
1702                         GOTO(out, rc);
1703                 }
1704                 /* simulating we got error during send rpc */
1705                 goto after_send;
1706         }
1707
1708         rc = ptl_send_rpc(req, 0);
1709         if (rc) {
1710                 DEBUG_REQ(D_HA, req, "send failed (%d); recovering", rc);
1711                 timeout = CFS_TICK;
1712         } else {
1713                 timeout = cfs_timeout_cap(cfs_time_seconds(req->rq_timeout));
1714                 DEBUG_REQ(D_NET, req,
1715                           "-- sleeping for "CFS_DURATION_T" jiffies", timeout);
1716         }
1717 repeat:
1718         lwi = LWI_TIMEOUT_INTR(timeout, expired_request, interrupted_request,
1719                                req);
1720         rc = l_wait_event(req->rq_reply_waitq, ptlrpc_check_reply(req), &lwi);
1721         if (rc == -ETIMEDOUT && ptlrpc_check_and_wait_suspend(req))
1722                 goto repeat;
1723
1724 after_send:
1725         CDEBUG(D_RPCTRACE, "Completed RPC pname:cluuid:pid:xid:nid:opc "
1726                "%s:%s:%d:"LPU64":%s:%d\n", cfs_curproc_comm(),
1727                imp->imp_obd->obd_uuid.uuid,
1728                lustre_msg_get_status(req->rq_reqmsg), req->rq_xid,
1729                libcfs_nid2str(imp->imp_connection->c_peer.nid),
1730                lustre_msg_get_opc(req->rq_reqmsg));
1731
1732         spin_lock(&imp->imp_lock);
1733         list_del_init(&req->rq_list);
1734         spin_unlock(&imp->imp_lock);
1735
1736         /* If the reply was received normally, this just grabs the spinlock
1737          * (ensuring the reply callback has returned), sees that
1738          * req->rq_receiving_reply is clear and returns. */
1739         ptlrpc_unregister_reply (req);
1740
1741         if (req->rq_err)
1742                 GOTO(out, rc = -EIO);
1743
1744         /* Resend if we need to, unless we were interrupted. */
1745         if (req->rq_resend && !req->rq_intr) {
1746                 /* ...unless we were specifically told otherwise. */
1747                 if (req->rq_no_resend)
1748                         GOTO(out, rc = -ETIMEDOUT);
1749                 spin_lock(&imp->imp_lock);
1750                 goto restart;
1751         }
1752
1753         if (req->rq_intr) {
1754                 /* Should only be interrupted if we timed out. */
1755                 if (!req->rq_timedout)
1756                         DEBUG_REQ(D_ERROR, req,
1757                                   "rq_intr set but rq_timedout not");
1758                 GOTO(out, rc = -EINTR);
1759         }
1760
1761         if (req->rq_timedout) {                 /* non-recoverable timeout */
1762                 GOTO(out, rc = -ETIMEDOUT);
1763         }
1764
1765         if (!req->rq_replied) {
1766                 /* How can this be? -eeb */
1767                 DEBUG_REQ(D_ERROR, req, "!rq_replied: ");
1768                 LBUG();
1769                 GOTO(out, rc = req->rq_status);
1770         }
1771
1772         rc = after_reply(req);
1773         /* NB may return +ve success rc */
1774         if (req->rq_resend) {
1775                 spin_lock(&imp->imp_lock);
1776                 goto restart;
1777         }
1778
1779  out:
1780         if (req->rq_bulk != NULL) {
1781                 if (rc >= 0) {
1782                         /* success so far.  Note that anything going wrong
1783                          * with bulk now, is EXTREMELY strange, since the
1784                          * server must have believed that the bulk
1785                          * tranferred OK before she replied with success to
1786                          * me. */
1787                         lwi = LWI_TIMEOUT(timeout, NULL, NULL);
1788                         brc = l_wait_event(req->rq_reply_waitq,
1789                                            !ptlrpc_bulk_active(req->rq_bulk),
1790                                            &lwi);
1791                         LASSERT(brc == 0 || brc == -ETIMEDOUT);
1792                         if (brc != 0) {
1793                                 LASSERT(brc == -ETIMEDOUT);
1794                                 DEBUG_REQ(D_ERROR, req, "bulk timed out");
1795                                 rc = brc;
1796                         } else if (!req->rq_bulk->bd_success) {
1797                                 DEBUG_REQ(D_ERROR, req, "bulk transfer failed");
1798                                 rc = -EIO;
1799                         }
1800                 }
1801                 if (rc < 0)
1802                         ptlrpc_unregister_bulk (req);
1803         }
1804
1805         LASSERT(!req->rq_receiving_reply);
1806         req->rq_phase = RQ_PHASE_INTERPRET;
1807
1808         atomic_dec(&imp->imp_inflight);
1809         cfs_waitq_signal(&imp->imp_recovery_waitq);
1810         RETURN(rc);
1811 }
1812
1813 struct ptlrpc_replay_async_args {
1814         int praa_old_state;
1815         int praa_old_status;
1816 };
1817
1818 static int ptlrpc_replay_interpret(struct ptlrpc_request *req,
1819                                     void * data, int rc)
1820 {
1821         struct ptlrpc_replay_async_args *aa = data;
1822         struct obd_import *imp = req->rq_import;
1823
1824         ENTRY;
1825         atomic_dec(&imp->imp_replay_inflight);
1826
1827         if (!req->rq_replied) {
1828                 CERROR("request replay timed out, restarting recovery\n");
1829                 GOTO(out, rc = -ETIMEDOUT);
1830         }
1831
1832         if (lustre_msg_get_type(req->rq_repmsg) == PTL_RPC_MSG_ERR &&
1833             lustre_msg_get_status(req->rq_repmsg) == -ENOTCONN)
1834                 GOTO(out, rc = lustre_msg_get_status(req->rq_repmsg));
1835
1836         /* The transno had better not change over replay. */
1837         LASSERT(lustre_msg_get_transno(req->rq_reqmsg) ==
1838                 lustre_msg_get_transno(req->rq_repmsg));
1839
1840         DEBUG_REQ(D_HA, req, "got rep");
1841
1842         /* let the callback do fixups, possibly including in the request */
1843         if (req->rq_replay_cb)
1844                 req->rq_replay_cb(req);
1845
1846         if (req->rq_replied &&
1847             lustre_msg_get_status(req->rq_repmsg) != aa->praa_old_status) {
1848                 DEBUG_REQ(D_ERROR, req, "status %d, old was %d",
1849                           lustre_msg_get_status(req->rq_repmsg),
1850                           aa->praa_old_status);
1851         } else {
1852                 /* Put it back for re-replay. */
1853                 lustre_msg_set_status(req->rq_repmsg, aa->praa_old_status);
1854         }
1855
1856         /*
1857          * Errors while replay can set transno to 0, but
1858          * imp_last_replay_transno shouldn't be set to 0 anyway
1859          */
1860         if (req->rq_transno > 0) {
1861                 spin_lock(&imp->imp_lock);
1862                 LASSERT(req->rq_transno <= imp->imp_last_replay_transno);
1863                 imp->imp_last_replay_transno = req->rq_transno;
1864                 spin_unlock(&imp->imp_lock);
1865         } else
1866                 CERROR("Transno is 0 during replay!\n");
1867         /* continue with recovery */
1868         rc = ptlrpc_import_recovery_state_machine(imp);
1869  out:
1870         req->rq_send_state = aa->praa_old_state;
1871
1872         if (rc != 0)
1873                 /* this replay failed, so restart recovery */
1874                 ptlrpc_connect_import(imp, NULL);
1875
1876         RETURN(rc);
1877 }
1878
1879 int ptlrpc_replay_req(struct ptlrpc_request *req)
1880 {
1881         struct ptlrpc_replay_async_args *aa;
1882         ENTRY;
1883
1884         LASSERT(req->rq_import->imp_state == LUSTRE_IMP_REPLAY);
1885
1886         /* Not handling automatic bulk replay yet (or ever?) */
1887         LASSERT(req->rq_bulk == NULL);
1888
1889         DEBUG_REQ(D_HA, req, "REPLAY");
1890
1891         LASSERT (sizeof (*aa) <= sizeof (req->rq_async_args));
1892         aa = (struct ptlrpc_replay_async_args *)&req->rq_async_args;
1893         memset(aa, 0, sizeof *aa);
1894
1895         /* Prepare request to be resent with ptlrpcd */
1896         aa->praa_old_state = req->rq_send_state;
1897         req->rq_send_state = LUSTRE_IMP_REPLAY;
1898         req->rq_phase = RQ_PHASE_NEW;
1899         aa->praa_old_status = lustre_msg_get_status(req->rq_repmsg);
1900         req->rq_status = 0;
1901
1902         req->rq_interpret_reply = ptlrpc_replay_interpret;
1903         atomic_inc(&req->rq_import->imp_replay_inflight);
1904         ptlrpc_request_addref(req); /* ptlrpcd needs a ref */
1905
1906         ptlrpcd_add_req(req);
1907         RETURN(0);
1908 }
1909
1910 void ptlrpc_abort_inflight(struct obd_import *imp)
1911 {
1912         struct list_head *tmp, *n;
1913         ENTRY;
1914
1915         /* Make sure that no new requests get processed for this import.
1916          * ptlrpc_{queue,set}_wait must (and does) hold imp_lock while testing
1917          * this flag and then putting requests on sending_list or delayed_list.
1918          */
1919         spin_lock(&imp->imp_lock);
1920
1921         /* XXX locking?  Maybe we should remove each request with the list
1922          * locked?  Also, how do we know if the requests on the list are
1923          * being freed at this time?
1924          */
1925         list_for_each_safe(tmp, n, &imp->imp_sending_list) {
1926                 struct ptlrpc_request *req =
1927                         list_entry(tmp, struct ptlrpc_request, rq_list);
1928
1929                 DEBUG_REQ(D_RPCTRACE, req, "inflight");
1930
1931                 spin_lock (&req->rq_lock);
1932                 if (req->rq_import_generation < imp->imp_generation) {
1933                         req->rq_err = 1;
1934                         ptlrpc_wake_client_req(req);
1935                 }
1936                 spin_unlock (&req->rq_lock);
1937         }
1938
1939         list_for_each_safe(tmp, n, &imp->imp_delayed_list) {
1940                 struct ptlrpc_request *req =
1941                         list_entry(tmp, struct ptlrpc_request, rq_list);
1942
1943                 DEBUG_REQ(D_RPCTRACE, req, "aborting waiting req");
1944
1945                 spin_lock (&req->rq_lock);
1946                 if (req->rq_import_generation < imp->imp_generation) {
1947                         req->rq_err = 1;
1948                         ptlrpc_wake_client_req(req);
1949                 }
1950                 spin_unlock (&req->rq_lock);
1951         }
1952
1953         /* Last chance to free reqs left on the replay list, but we
1954          * will still leak reqs that haven't committed.  */
1955         if (imp->imp_replayable)
1956                 ptlrpc_free_committed(imp);
1957
1958         spin_unlock(&imp->imp_lock);
1959
1960         EXIT;
1961 }
1962
1963 static __u64 ptlrpc_last_xid = 0;
1964 spinlock_t ptlrpc_last_xid_lock;
1965
1966 __u64 ptlrpc_next_xid(void)
1967 {
1968         __u64 tmp;
1969         spin_lock(&ptlrpc_last_xid_lock);
1970         tmp = ++ptlrpc_last_xid;
1971         spin_unlock(&ptlrpc_last_xid_lock);
1972         return tmp;
1973 }
1974
1975 __u64 ptlrpc_sample_next_xid(void)
1976 {
1977         __u64 tmp;
1978         spin_lock(&ptlrpc_last_xid_lock);
1979         tmp = ptlrpc_last_xid + 1;
1980         spin_unlock(&ptlrpc_last_xid_lock);
1981         return tmp;
1982 }
1983 EXPORT_SYMBOL(ptlrpc_sample_next_xid);