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_req_put_ctx(request);
 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 #if SWAB_PARANOIA
 644         /* Clear reply swab mask; this is a new reply in sender's byte order */
 645         req->rq_rep_swab_mask = 0;
 646 #endif
 647         rc = sptlrpc_cli_unwrap_reply(req);
 648         if (rc) {
 649                 DEBUG_REQ(D_ERROR, req, "unwrap reply failed (%d):", rc);
 650                 RETURN(rc);
 651         }
 652
 653         /* security layer unwrap might ask resend this request */
 654         if (req->rq_resend)
 655                 RETURN(0);
 656
 657         rc = lustre_unpack_msg(req->rq_repmsg, req->rq_replen);
 658         if (rc) {
 659                 DEBUG_REQ(D_ERROR, req, "unpack_rep failed: %d", rc);
 660                 RETURN(-EPROTO);
 661         }
 662
 663         rc = lustre_unpack_rep_ptlrpc_body(req, MSG_PTLRPC_BODY_OFF);
 664         if (rc) {
 665                 DEBUG_REQ(D_ERROR, req, "unpack ptlrpc body failed: %d", rc);
 666                 RETURN(-EPROTO);
 667         }
 668
 669         if (lustre_msg_get_type(req->rq_repmsg) != PTL_RPC_MSG_REPLY &&
 670             lustre_msg_get_type(req->rq_repmsg) != PTL_RPC_MSG_ERR) {
 671                 DEBUG_REQ(D_ERROR, req, "invalid packet received (type=%u)",
 672                           lustre_msg_get_type(req->rq_repmsg));
 673                 RETURN(-EPROTO);
 674         }
 675
 676         rc = ptlrpc_check_status(req);
 677         imp->imp_connect_error = rc;
 678
 679         /* Either we've been evicted, or the server has failed for
 680          * some reason. Try to reconnect, and if that fails, punt to the
 681          * upcall. */
 682         if ((rc == -ENOTCONN) || (rc == -ENODEV)) {
 683                 if (req->rq_send_state != LUSTRE_IMP_FULL ||
 684                     imp->imp_obd->obd_no_recov || imp->imp_dlm_fake) {
 685                         RETURN(-ENOTCONN);
 686                 }
 687
 688                 ptlrpc_request_handle_notconn(req);
 689
 690                 RETURN(rc);
 691         }
 692
 693         /* Store transno in reqmsg for replay. */
 694         req->rq_transno = lustre_msg_get_transno(req->rq_repmsg);
 695         lustre_msg_set_transno(req->rq_reqmsg, req->rq_transno);
 696
 697         if (req->rq_import->imp_replayable) {
 698                 spin_lock(&imp->imp_lock);
 699                 /* no point in adding already-committed requests to the replay
 700                  * list, we will just remove them immediately. b=9829 */
 701                 if (req->rq_transno != 0 &&
 702                     (req->rq_transno >
 703                      lustre_msg_get_last_committed(req->rq_repmsg) ||
 704                      req->rq_replay))
 705                         ptlrpc_retain_replayable_request(req, imp);
 706                 else if (req->rq_commit_cb != NULL) {
 707                         spin_unlock(&imp->imp_lock);
 708                         req->rq_commit_cb(req);
 709                         spin_lock(&imp->imp_lock);
 710                 }
 711
 712                 /* Replay-enabled imports return commit-status information. */
 713                 if (lustre_msg_get_last_committed(req->rq_repmsg)) {
 714                         imp->imp_peer_committed_transno =
 715                                 lustre_msg_get_last_committed(req->rq_repmsg);
 716                 }
 717                 ptlrpc_free_committed(imp);
 718                 spin_unlock(&imp->imp_lock);
 719         }
 720
 721         RETURN(rc);
 722 }
 723
 724 static int ptlrpc_send_new_req(struct ptlrpc_request *req)
 725 {
 726         struct obd_import     *imp;
 727         int rc;
 728         ENTRY;
 729
 730         LASSERT(req->rq_phase == RQ_PHASE_NEW);
 731         req->rq_phase = RQ_PHASE_RPC;
 732
 733         imp = req->rq_import;
 734         spin_lock(&imp->imp_lock);
 735
 736         req->rq_import_generation = imp->imp_generation;
 737
 738         if (ptlrpc_import_delay_req(imp, req, &rc)) {
 739                 spin_lock (&req->rq_lock);
 740                 req->rq_waiting = 1;
 741                 spin_unlock (&req->rq_lock);
 742
 743                 DEBUG_REQ(D_HA, req, "req from PID %d waiting for recovery: "
 744                           "(%s != %s)",
 745                           lustre_msg_get_status(req->rq_reqmsg) ,
 746                           ptlrpc_import_state_name(req->rq_send_state),
 747                           ptlrpc_import_state_name(imp->imp_state));
 748                 LASSERT(list_empty (&req->rq_list));
 749
 750                 list_add_tail(&req->rq_list, &imp->imp_delayed_list);
 751                 spin_unlock(&imp->imp_lock);
 752                 RETURN(0);
 753         }
 754
 755         if (rc != 0) {
 756                 spin_unlock(&imp->imp_lock);
 757                 req->rq_status = rc;
 758                 req->rq_phase = RQ_PHASE_INTERPRET;
 759                 RETURN(rc);
 760         }
 761
 762         /* XXX this is the same as ptlrpc_queue_wait */
 763         LASSERT(list_empty(&req->rq_list));
 764         list_add_tail(&req->rq_list, &imp->imp_sending_list);
 765         spin_unlock(&imp->imp_lock);
 766
 767         lustre_msg_set_status(req->rq_reqmsg, cfs_curproc_pid());
 768
 769         rc = sptlrpc_req_refresh_ctx(req, -1);
 770         if (rc) {
 771                 if (req->rq_err) {
 772                         req->rq_status = rc;
 773                         RETURN(1);
 774                 } else {
 775                         /* here begins timeout counting */
 776                         req->rq_sent = CURRENT_SECONDS;
 777                         req->rq_wait_ctx = 1;
 778                         RETURN(0);
 779                 }
 780         }
 781
 782         CDEBUG(D_RPCTRACE, "Sending RPC pname:cluuid:pid:xid:nid:opc"
 783                " %s:%s:%d:"LPU64":%s:%d\n", cfs_curproc_comm(),
 784                imp->imp_obd->obd_uuid.uuid,
 785                lustre_msg_get_status(req->rq_reqmsg), req->rq_xid,
 786                libcfs_nid2str(imp->imp_connection->c_peer.nid),
 787                lustre_msg_get_opc(req->rq_reqmsg));
 788
 789         rc = ptl_send_rpc(req, 0);
 790         if (rc) {
 791                 DEBUG_REQ(D_HA, req, "send failed (%d); expect timeout", rc);
 792                 req->rq_net_err = 1;
 793                 RETURN(rc);
 794         }
 795         RETURN(0);
 796 }
 797
 798 /* this sends any unsent RPCs in @set and returns TRUE if all are sent */
 799 int ptlrpc_check_set(struct ptlrpc_request_set *set)
 800 {
 801         struct list_head *tmp;
 802         int force_timer_recalc = 0;
 803         ENTRY;
 804
 805         if (set->set_remaining == 0)
 806                 RETURN(1);
 807
 808         list_for_each(tmp, &set->set_requests) {
 809                 struct ptlrpc_request *req =
 810                         list_entry(tmp, struct ptlrpc_request, rq_set_chain);
 811                 struct obd_import *imp = req->rq_import;
 812                 int rc = 0;
 813
 814                 if (req->rq_phase == RQ_PHASE_NEW &&
 815                     ptlrpc_send_new_req(req)) {
 816                         force_timer_recalc = 1;
 817                 }
 818
 819                 if (!(req->rq_phase == RQ_PHASE_RPC ||
 820                       req->rq_phase == RQ_PHASE_BULK ||
 821                       req->rq_phase == RQ_PHASE_INTERPRET ||
 822                       req->rq_phase == RQ_PHASE_COMPLETE)) {
 823                         DEBUG_REQ(D_ERROR, req, "bad phase %x", req->rq_phase);
 824                         LBUG();
 825                 }
 826
 827                 if (req->rq_phase == RQ_PHASE_COMPLETE)
 828                         continue;
 829
 830                 if (req->rq_phase == RQ_PHASE_INTERPRET)
 831                         GOTO(interpret, req->rq_status);
 832
 833                 if (req->rq_net_err && !req->rq_timedout)
 834                         ptlrpc_expire_one_request(req);
 835
 836                 if (req->rq_err) {
 837                         ptlrpc_unregister_reply(req);
 838                         req->rq_replied = 0;
 839                         if (req->rq_status == 0)
 840                                 req->rq_status = -EIO;
 841                         req->rq_phase = RQ_PHASE_INTERPRET;
 842
 843                         spin_lock(&imp->imp_lock);
 844                         list_del_init(&req->rq_list);
 845                         spin_unlock(&imp->imp_lock);
 846
 847                         GOTO(interpret, req->rq_status);
 848                 }
 849
 850                 /* ptlrpc_queue_wait->l_wait_event guarantees that rq_intr
 851                  * will only be set after rq_timedout, but the oig waiting
 852                  * path sets rq_intr irrespective of whether ptlrpcd has
 853                  * seen a timeout.  our policy is to only interpret
 854                  * interrupted rpcs after they have timed out */
 855                 if (req->rq_intr && (req->rq_timedout || req->rq_waiting ||
 856                                      req->rq_wait_ctx)) {
 857                         /* NB could be on delayed list */
 858                         ptlrpc_unregister_reply(req);
 859                         req->rq_status = -EINTR;
 860                         req->rq_phase = RQ_PHASE_INTERPRET;
 861
 862                         spin_lock(&imp->imp_lock);
 863                         list_del_init(&req->rq_list);
 864                         spin_unlock(&imp->imp_lock);
 865
 866                         GOTO(interpret, req->rq_status);
 867                 }
 868
 869                 if (req->rq_phase == RQ_PHASE_RPC) {
 870                         if (req->rq_timedout || req->rq_resend ||
 871                             req->rq_waiting || req->rq_wait_ctx) {
 872                                 int status;
 873
 874                                 /* rq_wait_ctx is only touched in ptlrpcd,
 875                                  * no lock needed here.
 876                                  */
 877                                 if (req->rq_wait_ctx)
 878                                         goto check_ctx;
 879
 880                                 ptlrpc_unregister_reply(req);
 881
 882                                 spin_lock(&imp->imp_lock);
 883
 884                                 if (ptlrpc_import_delay_req(imp, req, &status)){
 885                                         spin_unlock(&imp->imp_lock);
 886                                         continue;
 887                                 }
 888
 889                                 list_del_init(&req->rq_list);
 890                                 if (status != 0)  {
 891                                         req->rq_status = status;
 892                                         req->rq_phase = RQ_PHASE_INTERPRET;
 893                                         spin_unlock(&imp->imp_lock);
 894                                         GOTO(interpret, req->rq_status);
 895                                 }
 896                                 if (req->rq_no_resend && !req->rq_wait_ctx) {
 897                                         req->rq_status = -ENOTCONN;
 898                                         req->rq_phase = RQ_PHASE_INTERPRET;
 899                                         spin_unlock(&imp->imp_lock);
 900                                         GOTO(interpret, req->rq_status);
 901                                 }
 902                                 list_add_tail(&req->rq_list,
 903                                               &imp->imp_sending_list);
 904
 905                                 spin_unlock(&imp->imp_lock);
 906
 907                                 req->rq_waiting = 0;
 908                                 if (req->rq_resend) {
 909                                         lustre_msg_add_flags(req->rq_reqmsg,
 910                                                              MSG_RESENT);
 911                                         if (req->rq_bulk) {
 912                                                 __u64 old_xid = req->rq_xid;
 913
 914                                                 ptlrpc_unregister_bulk (req);
 915
 916                                                 /* ensure previous bulk fails */
 917                                                 req->rq_xid = ptlrpc_next_xid();
 918                                                 CDEBUG(D_HA, "resend bulk "
 919                                                        "old x"LPU64
 920                                                        " new x"LPU64"\n",
 921                                                        old_xid, req->rq_xid);
 922                                         }
 923                                 }
 924 check_ctx:
 925                                 status = sptlrpc_req_refresh_ctx(req, -1);
 926                                 if (status) {
 927                                         if (req->rq_err) {
 928                                                 req->rq_status = status;
 929                                                 force_timer_recalc = 1;
 930                                         }
 931                                         if (!req->rq_wait_ctx) {
 932                                                 /* begins timeout counting */
 933                                                 req->rq_sent = CURRENT_SECONDS;
 934                                                 req->rq_wait_ctx = 1;
 935                                         }
 936                                         continue;
 937                                 } else {
 938                                         req->rq_sent = 0;
 939                                         req->rq_wait_ctx = 0;
 940                                 }
 941
 942                                 rc = ptl_send_rpc(req, 0);
 943                                 if (rc) {
 944                                         DEBUG_REQ(D_HA, req, "send failed (%d)",
 945                                                   rc);
 946                                         force_timer_recalc = 1;
 947                                         req->rq_net_err = 1;
 948                                 }
 949                                 /* need to reset the timeout */
 950                                 force_timer_recalc = 1;
 951                         }
 952
 953                         /* Still waiting for a reply? */
 954                         if (ptlrpc_client_receiving_reply(req))
 955                                 continue;
 956
 957                         /* Did we actually receive a reply? */
 958                         if (!ptlrpc_client_replied(req))
 959                                 continue;
 960
 961                         spin_lock(&imp->imp_lock);
 962                         list_del_init(&req->rq_list);
 963                         spin_unlock(&imp->imp_lock);
 964
 965                         req->rq_status = after_reply(req);
 966                         if (req->rq_resend) {
 967                                 /* Add this req to the delayed list so
 968                                    it can be errored if the import is
 969                                    evicted after recovery. */
 970                                 spin_lock(&imp->imp_lock);
 971                                 list_add_tail(&req->rq_list,
 972                                               &imp->imp_delayed_list);
 973                                 spin_unlock(&imp->imp_lock);
 974                                 continue;
 975                         }
 976
 977                         /* If there is no bulk associated with this request,
 978                          * then we're done and should let the interpreter
 979                          * process the reply.  Similarly if the RPC returned
 980                          * an error, and therefore the bulk will never arrive.
 981                          */
 982                         if (req->rq_bulk == NULL || req->rq_status != 0) {
 983                                 req->rq_phase = RQ_PHASE_INTERPRET;
 984                                 GOTO(interpret, req->rq_status);
 985                         }
 986
 987                         req->rq_phase = RQ_PHASE_BULK;
 988                 }
 989
 990                 LASSERT(req->rq_phase == RQ_PHASE_BULK);
 991                 if (ptlrpc_bulk_active(req->rq_bulk))
 992                         continue;
 993
 994                 if (!req->rq_bulk->bd_success) {
 995                         /* The RPC reply arrived OK, but the bulk screwed
 996                          * up!  Dead wierd since the server told us the RPC
 997                          * was good after getting the REPLY for her GET or
 998                          * the ACK for her PUT. */
 999                         DEBUG_REQ(D_ERROR, req, "bulk transfer failed");
1000                         LBUG();
1001                 }
1002
1003                 req->rq_phase = RQ_PHASE_INTERPRET;
1004
1005         interpret:
1006                 LASSERT(req->rq_phase == RQ_PHASE_INTERPRET);
1007                 LASSERT(!req->rq_receiving_reply);
1008
1009                 ptlrpc_unregister_reply(req);
1010                 if (req->rq_bulk != NULL)
1011                         ptlrpc_unregister_bulk (req);
1012
1013                 req->rq_phase = RQ_PHASE_COMPLETE;
1014
1015                 if (req->rq_interpret_reply != NULL) {
1016                         int (*interpreter)(struct ptlrpc_request *,void *,int) =
1017                                 req->rq_interpret_reply;
1018                         req->rq_status = interpreter(req, &req->rq_async_args,
1019                                                      req->rq_status);
1020                 }
1021
1022                 CDEBUG(D_RPCTRACE, "Completed RPC pname:cluuid:pid:xid:nid:"
1023                        "opc %s:%s:%d:"LPU64":%s:%d\n", cfs_curproc_comm(),
1024                        imp->imp_obd->obd_uuid.uuid,
1025                        lustre_msg_get_status(req->rq_reqmsg), req->rq_xid,
1026                        libcfs_nid2str(imp->imp_connection->c_peer.nid),
1027                        lustre_msg_get_opc(req->rq_reqmsg));
1028
1029                 set->set_remaining--;
1030
1031                 atomic_dec(&imp->imp_inflight);
1032                 cfs_waitq_signal(&imp->imp_recovery_waitq);
1033         }
1034
1035         /* If we hit an error, we want to recover promptly. */
1036         RETURN(set->set_remaining == 0 || force_timer_recalc);
1037 }
1038
1039 int ptlrpc_expire_one_request(struct ptlrpc_request *req)
1040 {
1041         struct obd_import *imp = req->rq_import;
1042         int rc = 0;
1043         ENTRY;
1044
1045         DEBUG_REQ(D_ERROR|D_NETERROR, req, "%s (sent at %lu, %lus ago)",
1046                   req->rq_net_err ? "network error" : "timeout",
1047                   (long)req->rq_sent, CURRENT_SECONDS - req->rq_sent);
1048
1049         if (imp != NULL && obd_debug_peer_on_timeout)
1050                 LNetCtl(IOC_LIBCFS_DEBUG_PEER, &imp->imp_connection->c_peer);
1051
1052         spin_lock(&req->rq_lock);
1053         req->rq_timedout = 1;
1054         req->rq_wait_ctx = 0;
1055         spin_unlock(&req->rq_lock);
1056
1057         ptlrpc_unregister_reply (req);
1058
1059         if (obd_dump_on_timeout)
1060                 libcfs_debug_dumplog();
1061
1062         if (req->rq_bulk != NULL)
1063                 ptlrpc_unregister_bulk (req);
1064
1065         if (imp == NULL) {
1066                 DEBUG_REQ(D_HA, req, "NULL import: already cleaned up?");
1067                 RETURN(1);
1068         }
1069
1070         /* The DLM server doesn't want recovery run on its imports. */
1071         if (imp->imp_dlm_fake)
1072                 RETURN(1);
1073
1074         /* If this request is for recovery or other primordial tasks,
1075          * then error it out here. */
1076         if (req->rq_ctx_init || req->rq_ctx_fini ||
1077             req->rq_send_state != LUSTRE_IMP_FULL ||
1078             imp->imp_obd->obd_no_recov) {
1079                 spin_lock(&req->rq_lock);
1080                 req->rq_status = -ETIMEDOUT;
1081                 req->rq_err = 1;
1082                 spin_unlock(&req->rq_lock);
1083                 RETURN(1);
1084         }
1085
1086         /* if request can't be resend we can't wait answer after timeout */
1087         if (req->rq_no_resend) {
1088                 DEBUG_REQ(D_RPCTRACE, req, "TIMEOUT-NORESEND:");
1089                 rc = 1;
1090         }
1091
1092         ptlrpc_fail_import(imp, lustre_msg_get_conn_cnt(req->rq_reqmsg));
1093
1094         RETURN(rc);
1095 }
1096
1097 int ptlrpc_expired_set(void *data)
1098 {
1099         struct ptlrpc_request_set *set = data;
1100         struct list_head          *tmp;
1101         time_t                     now = CURRENT_SECONDS;
1102         ENTRY;
1103
1104         LASSERT(set != NULL);
1105
1106         /* A timeout expired; see which reqs it applies to... */
1107         list_for_each (tmp, &set->set_requests) {
1108                 struct ptlrpc_request *req =
1109                         list_entry(tmp, struct ptlrpc_request, rq_set_chain);
1110
1111                 /* request in-flight? */
1112                 if (!((req->rq_phase == RQ_PHASE_RPC && !req->rq_waiting &&
1113                        !req->rq_resend) ||
1114                       (req->rq_phase == RQ_PHASE_BULK)))
1115                         continue;
1116
1117                 if (req->rq_timedout ||           /* already dealt with */
1118                     req->rq_sent + req->rq_timeout > now) /* not expired */
1119                         continue;
1120
1121                 /* deal with this guy */
1122                 ptlrpc_expire_one_request (req);
1123         }
1124
1125         /* When waiting for a whole set, we always to break out of the
1126          * sleep so we can recalculate the timeout, or enable interrupts
1127          * iff everyone's timed out.
1128          */
1129         RETURN(1);
1130 }
1131
1132 void ptlrpc_mark_interrupted(struct ptlrpc_request *req)
1133 {
1134         spin_lock(&req->rq_lock);
1135         req->rq_intr = 1;
1136         spin_unlock(&req->rq_lock);
1137 }
1138
1139 void ptlrpc_interrupted_set(void *data)
1140 {
1141         struct ptlrpc_request_set *set = data;
1142         struct list_head *tmp;
1143
1144         LASSERT(set != NULL);
1145         CERROR("INTERRUPTED SET %p\n", set);
1146
1147         list_for_each(tmp, &set->set_requests) {
1148                 struct ptlrpc_request *req =
1149                         list_entry(tmp, struct ptlrpc_request, rq_set_chain);
1150
1151                 if (req->rq_phase != RQ_PHASE_RPC)
1152                         continue;
1153
1154                 ptlrpc_mark_interrupted(req);
1155         }
1156 }
1157
1158 int ptlrpc_set_next_timeout(struct ptlrpc_request_set *set)
1159 {
1160         struct list_head      *tmp;
1161         time_t                 now = CURRENT_SECONDS;
1162         time_t                 deadline;
1163         int                    timeout = 0;
1164         struct ptlrpc_request *req;
1165         ENTRY;
1166
1167         SIGNAL_MASK_ASSERT(); /* XXX BUG 1511 */
1168
1169         list_for_each(tmp, &set->set_requests) {
1170                 req = list_entry(tmp, struct ptlrpc_request, rq_set_chain);
1171
1172                 /* request in-flight? */
1173                 if (!((req->rq_phase == RQ_PHASE_RPC && !req->rq_waiting) ||
1174                       (req->rq_phase == RQ_PHASE_BULK)))
1175                         continue;
1176
1177                 if (req->rq_timedout)   /* already timed out */
1178                         continue;
1179
1180                 deadline = req->rq_sent + req->rq_timeout;
1181                 if (deadline <= now)    /* actually expired already */
1182                         timeout = 1;    /* ASAP */
1183                 else if (timeout == 0 || timeout > deadline - now)
1184                         timeout = deadline - now;
1185         }
1186         RETURN(timeout);
1187 }
1188
1189 int ptlrpc_set_wait(struct ptlrpc_request_set *set)
1190 {
1191         struct list_head      *tmp;
1192         struct ptlrpc_request *req;
1193         struct l_wait_info     lwi;
1194         int                    rc, timeout;
1195         ENTRY;
1196
1197         if (list_empty(&set->set_requests))
1198                 RETURN(0);
1199
1200         list_for_each(tmp, &set->set_requests) {
1201                 req = list_entry(tmp, struct ptlrpc_request, rq_set_chain);
1202                 if (req->rq_phase == RQ_PHASE_NEW)
1203                         (void)ptlrpc_send_new_req(req);
1204         }
1205
1206         do {
1207                 timeout = ptlrpc_set_next_timeout(set);
1208
1209                 /* wait until all complete, interrupted, or an in-flight
1210                  * req times out */
1211                 CDEBUG(D_HA, "set %p going to sleep for %d seconds\n",
1212                        set, timeout);
1213                 lwi = LWI_TIMEOUT_INTR(cfs_time_seconds(timeout ? timeout : 1),
1214                                        ptlrpc_expired_set,
1215                                        ptlrpc_interrupted_set, set);
1216                 rc = l_wait_event(set->set_waitq, ptlrpc_check_set(set), &lwi);
1217
1218                 LASSERT(rc == 0 || rc == -EINTR || rc == -ETIMEDOUT);
1219
1220                 /* -EINTR => all requests have been flagged rq_intr so next
1221                  * check completes.
1222                  * -ETIMEOUTD => someone timed out.  When all reqs have
1223                  * timed out, signals are enabled allowing completion with
1224                  * EINTR.
1225                  * I don't really care if we go once more round the loop in
1226                  * the error cases -eeb. */
1227         } while (rc != 0 || set->set_remaining != 0);
1228
1229         LASSERT(set->set_remaining == 0);
1230
1231         rc = 0;
1232         list_for_each(tmp, &set->set_requests) {
1233                 req = list_entry(tmp, struct ptlrpc_request, rq_set_chain);
1234
1235                 LASSERT(req->rq_phase == RQ_PHASE_COMPLETE);
1236                 if (req->rq_status != 0)
1237                         rc = req->rq_status;
1238         }
1239
1240         if (set->set_interpret != NULL) {
1241                 int (*interpreter)(struct ptlrpc_request_set *set,void *,int) =
1242                         set->set_interpret;
1243                 rc = interpreter (set, set->set_arg, rc);
1244         }
1245
1246         RETURN(rc);
1247 }
1248
1249 static void __ptlrpc_free_req(struct ptlrpc_request *request, int locked)
1250 {
1251         ENTRY;
1252         if (request == NULL) {
1253                 EXIT;
1254                 return;
1255         }
1256
1257         LASSERTF(!request->rq_receiving_reply, "req %p\n", request);
1258         LASSERTF(request->rq_rqbd == NULL, "req %p\n",request);/* client-side */
1259         LASSERTF(list_empty(&request->rq_list), "req %p\n", request);
1260         LASSERTF(list_empty(&request->rq_set_chain), "req %p\n", request);
1261         LASSERT(request->rq_cli_ctx);
1262
1263         /* We must take it off the imp_replay_list first.  Otherwise, we'll set
1264          * request->rq_reqmsg to NULL while osc_close is dereferencing it. */
1265         if (request->rq_import != NULL) {
1266                 if (!locked)
1267                         spin_lock(&request->rq_import->imp_lock);
1268                 list_del_init(&request->rq_mod_list);
1269                 list_del_init(&request->rq_replay_list);
1270                 if (!locked)
1271                         spin_unlock(&request->rq_import->imp_lock);
1272         }
1273         LASSERTF(list_empty(&request->rq_replay_list), "req %p\n", request);
1274
1275         if (atomic_read(&request->rq_refcount) != 0) {
1276                 DEBUG_REQ(D_ERROR, request,
1277                           "freeing request with nonzero refcount");
1278                 LBUG();
1279         }
1280
1281         if (request->rq_repbuf != NULL)
1282                 sptlrpc_cli_free_repbuf(request);
1283         if (request->rq_export != NULL) {
1284                 class_export_put(request->rq_export);
1285                 request->rq_export = NULL;
1286         }
1287         if (request->rq_import != NULL) {
1288                 class_import_put(request->rq_import);
1289                 request->rq_import = NULL;
1290         }
1291         if (request->rq_bulk != NULL)
1292                 ptlrpc_free_bulk(request->rq_bulk);
1293
1294         if (request->rq_reqbuf != NULL || request->rq_clrbuf != NULL)
1295                 sptlrpc_cli_free_reqbuf(request);
1296
1297         sptlrpc_req_put_ctx(request);
1298
1299         if (request->rq_pool)
1300                 __ptlrpc_free_req_to_pool(request);
1301         else
1302                 OBD_FREE(request, sizeof(*request));
1303         EXIT;
1304 }
1305
1306 void ptlrpc_free_req(struct ptlrpc_request *request)
1307 {
1308         __ptlrpc_free_req(request, 0);
1309 }
1310
1311 static int __ptlrpc_req_finished(struct ptlrpc_request *request, int locked);
1312 void ptlrpc_req_finished_with_imp_lock(struct ptlrpc_request *request)
1313 {
1314         LASSERT_SPIN_LOCKED(&request->rq_import->imp_lock);
1315         (void)__ptlrpc_req_finished(request, 1);
1316 }
1317
1318 static int __ptlrpc_req_finished(struct ptlrpc_request *request, int locked)
1319 {
1320         ENTRY;
1321         if (request == NULL)
1322                 RETURN(1);
1323
1324         if (request == LP_POISON ||
1325             request->rq_reqmsg == LP_POISON) {
1326                 CERROR("dereferencing freed request (bug 575)\n");
1327                 LBUG();
1328                 RETURN(1);
1329         }
1330
1331         DEBUG_REQ(D_INFO, request, "refcount now %u",
1332                   atomic_read(&request->rq_refcount) - 1);
1333
1334         if (atomic_dec_and_test(&request->rq_refcount)) {
1335                 __ptlrpc_free_req(request, locked);
1336                 RETURN(1);
1337         }
1338
1339         RETURN(0);
1340 }
1341
1342 void ptlrpc_req_finished(struct ptlrpc_request *request)
1343 {
1344         __ptlrpc_req_finished(request, 0);
1345 }
1346
1347 __u64 ptlrpc_req_xid(struct ptlrpc_request *request)
1348 {
1349         return request->rq_xid;
1350 }
1351 EXPORT_SYMBOL(ptlrpc_req_xid);
1352
1353 /* Disengage the client's reply buffer from the network
1354  * NB does _NOT_ unregister any client-side bulk.
1355  * IDEMPOTENT, but _not_ safe against concurrent callers.
1356  * The request owner (i.e. the thread doing the I/O) must call...
1357  */
1358 void ptlrpc_unregister_reply (struct ptlrpc_request *request)
1359 {
1360         int                rc;
1361         cfs_waitq_t       *wq;
1362         struct l_wait_info lwi;
1363
1364         LASSERT(!in_interrupt ());             /* might sleep */
1365
1366         if (!ptlrpc_client_receiving_reply(request))
1367                 return;
1368
1369         LNetMDUnlink (request->rq_reply_md_h);
1370
1371         /* We have to l_wait_event() whatever the result, to give liblustre
1372          * a chance to run reply_in_callback() */
1373
1374         if (request->rq_set != NULL)
1375                 wq = &request->rq_set->set_waitq;
1376         else
1377                 wq = &request->rq_reply_waitq;
1378
1379         for (;;) {
1380                 /* Network access will complete in finite time but the HUGE
1381                  * timeout lets us CWARN for visibility of sluggish NALs */
1382                 lwi = LWI_TIMEOUT(cfs_time_seconds(300), NULL, NULL);
1383                 rc = l_wait_event (*wq, !ptlrpc_client_receiving_reply(request), &lwi);
1384                 if (rc == 0)
1385                         return;
1386
1387                 LASSERT (rc == -ETIMEDOUT);
1388                 DEBUG_REQ(D_WARNING, request, "Unexpectedly long timeout");
1389         }
1390 }
1391
1392 /* caller must hold imp->imp_lock */
1393 void ptlrpc_free_committed(struct obd_import *imp)
1394 {
1395         struct list_head *tmp, *saved;
1396         struct ptlrpc_request *req;
1397         struct ptlrpc_request *last_req = NULL; /* temporary fire escape */
1398         ENTRY;
1399
1400         LASSERT(imp != NULL);
1401
1402         LASSERT_SPIN_LOCKED(&imp->imp_lock);
1403
1404
1405         if (imp->imp_peer_committed_transno == imp->imp_last_transno_checked &&
1406             imp->imp_generation == imp->imp_last_generation_checked) {
1407                 CDEBUG(D_HA, "%s: skip recheck for last_committed "LPU64"\n",
1408                        imp->imp_obd->obd_name, imp->imp_peer_committed_transno);
1409                 return;
1410         }
1411
1412         CDEBUG(D_HA, "%s: committing for last_committed "LPU64" gen %d\n",
1413                imp->imp_obd->obd_name, imp->imp_peer_committed_transno,
1414                imp->imp_generation);
1415         imp->imp_last_transno_checked = imp->imp_peer_committed_transno;
1416         imp->imp_last_generation_checked = imp->imp_generation;
1417
1418         list_for_each_safe(tmp, saved, &imp->imp_replay_list) {
1419                 req = list_entry(tmp, struct ptlrpc_request, rq_replay_list);
1420
1421                 /* XXX ok to remove when 1357 resolved - rread 05/29/03  */
1422                 LASSERT(req != last_req);
1423                 last_req = req;
1424
1425                 if (req->rq_import_generation < imp->imp_generation) {
1426                         DEBUG_REQ(D_HA, req, "freeing request with old gen");
1427                         GOTO(free_req, 0);
1428                 }
1429
1430                 if (req->rq_replay) {
1431                         DEBUG_REQ(D_HA, req, "keeping (FL_REPLAY)");
1432                         continue;
1433                 }
1434
1435                 /* not yet committed */
1436                 if (req->rq_transno > imp->imp_peer_committed_transno) {
1437                         DEBUG_REQ(D_HA, req, "stopping search");
1438                         break;
1439                 }
1440
1441                 DEBUG_REQ(D_HA, req, "committing (last_committed "LPU64")",
1442                           imp->imp_peer_committed_transno);
1443 free_req:
1444                 spin_lock(&req->rq_lock);
1445                 req->rq_replay = 0;
1446                 spin_unlock(&req->rq_lock);
1447                 if (req->rq_commit_cb != NULL)
1448                         req->rq_commit_cb(req);
1449                 list_del_init(&req->rq_replay_list);
1450                 __ptlrpc_req_finished(req, 1);
1451         }
1452
1453         EXIT;
1454         return;
1455 }
1456
1457 void ptlrpc_cleanup_client(struct obd_import *imp)
1458 {
1459         ENTRY;
1460         EXIT;
1461         return;
1462 }
1463
1464 void ptlrpc_resend_req(struct ptlrpc_request *req)
1465 {
1466         DEBUG_REQ(D_HA, req, "going to resend");
1467         lustre_msg_set_handle(req->rq_reqmsg, &(struct lustre_handle){ 0 });
1468         req->rq_status = -EAGAIN;
1469
1470         spin_lock(&req->rq_lock);
1471         req->rq_resend = 1;
1472         req->rq_net_err = 0;
1473         req->rq_timedout = 0;
1474         if (req->rq_bulk) {
1475                 __u64 old_xid = req->rq_xid;
1476
1477                 /* ensure previous bulk fails */
1478                 req->rq_xid = ptlrpc_next_xid();
1479                 CDEBUG(D_HA, "resend bulk old x"LPU64" new x"LPU64"\n",
1480                        old_xid, req->rq_xid);
1481         }
1482         ptlrpc_wake_client_req(req);
1483         spin_unlock(&req->rq_lock);
1484 }
1485
1486 /* XXX: this function and rq_status are currently unused */
1487 void ptlrpc_restart_req(struct ptlrpc_request *req)
1488 {
1489         DEBUG_REQ(D_HA, req, "restarting (possibly-)completed request");
1490         req->rq_status = -ERESTARTSYS;
1491
1492         spin_lock(&req->rq_lock);
1493         req->rq_restart = 1;
1494         req->rq_timedout = 0;
1495         ptlrpc_wake_client_req(req);
1496         spin_unlock(&req->rq_lock);
1497 }
1498
1499 static int expired_request(void *data)
1500 {
1501         struct ptlrpc_request *req = data;
1502         ENTRY;
1503
1504         /* some failure can suspend regular timeouts */
1505         if (ptlrpc_check_suspend())
1506                 RETURN(1);
1507
1508         RETURN(ptlrpc_expire_one_request(req));
1509 }
1510
1511 static void interrupted_request(void *data)
1512 {
1513         struct ptlrpc_request *req = data;
1514         DEBUG_REQ(D_HA, req, "request interrupted");
1515         spin_lock(&req->rq_lock);
1516         req->rq_intr = 1;
1517         spin_unlock(&req->rq_lock);
1518 }
1519
1520 struct ptlrpc_request *ptlrpc_request_addref(struct ptlrpc_request *req)
1521 {
1522         ENTRY;
1523         atomic_inc(&req->rq_refcount);
1524         RETURN(req);
1525 }
1526
1527 void ptlrpc_retain_replayable_request(struct ptlrpc_request *req,
1528                                       struct obd_import *imp)
1529 {
1530         struct list_head *tmp;
1531
1532         LASSERT_SPIN_LOCKED(&imp->imp_lock);
1533
1534         /* clear this for new requests that were resent as well
1535            as resent replayed requests. */
1536         lustre_msg_clear_flags(req->rq_reqmsg, MSG_RESENT);
1537
1538         /* don't re-add requests that have been replayed */
1539         if (!list_empty(&req->rq_replay_list))
1540                 return;
1541
1542         lustre_msg_add_flags(req->rq_reqmsg, MSG_REPLAY);
1543
1544         LASSERT(imp->imp_replayable);
1545         /* Balanced in ptlrpc_free_committed, usually. */
1546         ptlrpc_request_addref(req);
1547         list_for_each_prev(tmp, &imp->imp_replay_list) {
1548                 struct ptlrpc_request *iter =
1549                         list_entry(tmp, struct ptlrpc_request, rq_replay_list);
1550
1551                 /* We may have duplicate transnos if we create and then
1552                  * open a file, or for closes retained if to match creating
1553                  * opens, so use req->rq_xid as a secondary key.
1554                  * (See bugs 684, 685, and 428.)
1555                  * XXX no longer needed, but all opens need transnos!
1556                  */
1557                 if (iter->rq_transno > req->rq_transno)
1558                         continue;
1559
1560                 if (iter->rq_transno == req->rq_transno) {
1561                         LASSERT(iter->rq_xid != req->rq_xid);
1562                         if (iter->rq_xid > req->rq_xid)
1563                                 continue;
1564                 }
1565
1566                 list_add(&req->rq_replay_list, &iter->rq_replay_list);
1567                 return;
1568         }
1569
1570         list_add_tail(&req->rq_replay_list, &imp->imp_replay_list);
1571 }
1572
1573 int ptlrpc_queue_wait(struct ptlrpc_request *req)
1574 {
1575         int rc = 0;
1576         int brc;
1577         struct l_wait_info lwi;
1578         struct obd_import *imp = req->rq_import;
1579         cfs_duration_t timeout = 0;
1580         ENTRY;
1581
1582         LASSERT(req->rq_set == NULL);
1583         LASSERT(!req->rq_receiving_reply);
1584         atomic_inc(&imp->imp_inflight);
1585
1586         /* for distributed debugging */
1587         lustre_msg_set_status(req->rq_reqmsg, cfs_curproc_pid());
1588         LASSERT(imp->imp_obd != NULL);
1589         CDEBUG(D_RPCTRACE, "Sending RPC pname:cluuid:pid:xid:nid:opc "
1590                "%s:%s:%d:"LPU64":%s:%d\n", cfs_curproc_comm(),
1591                imp->imp_obd->obd_uuid.uuid,
1592                lustre_msg_get_status(req->rq_reqmsg), req->rq_xid,
1593                libcfs_nid2str(imp->imp_connection->c_peer.nid),
1594                lustre_msg_get_opc(req->rq_reqmsg));
1595
1596         /* Mark phase here for a little debug help */
1597         req->rq_phase = RQ_PHASE_RPC;
1598
1599         spin_lock(&imp->imp_lock);
1600         req->rq_import_generation = imp->imp_generation;
1601 restart:
1602         if (ptlrpc_import_delay_req(imp, req, &rc)) {
1603                 list_del(&req->rq_list);
1604
1605                 list_add_tail(&req->rq_list, &imp->imp_delayed_list);
1606                 spin_unlock(&imp->imp_lock);
1607
1608                 DEBUG_REQ(D_HA, req, "\"%s\" waiting for recovery: (%s != %s)",
1609                           cfs_curproc_comm(),
1610                           ptlrpc_import_state_name(req->rq_send_state),
1611                           ptlrpc_import_state_name(imp->imp_state));
1612                 lwi = LWI_INTR(interrupted_request, req);
1613                 rc = l_wait_event(req->rq_reply_waitq,
1614                                   (req->rq_send_state == imp->imp_state ||
1615                                    req->rq_err || req->rq_intr),
1616                                   &lwi);
1617                 DEBUG_REQ(D_HA, req, "\"%s\" awake: (%s == %s or %d/%d == 1)",
1618                           cfs_curproc_comm(),
1619                           ptlrpc_import_state_name(imp->imp_state),
1620                           ptlrpc_import_state_name(req->rq_send_state),
1621                           req->rq_err, req->rq_intr);
1622
1623                 spin_lock(&imp->imp_lock);
1624                 list_del_init(&req->rq_list);
1625
1626                 if (req->rq_err) {
1627                         rc = -EIO;
1628                 }
1629                 else if (req->rq_intr) {
1630                         rc = -EINTR;
1631                 }
1632                 else if (req->rq_no_resend) {
1633                         spin_unlock(&imp->imp_lock);
1634                         GOTO(out, rc = -ETIMEDOUT);
1635                 }
1636                 else {
1637                         GOTO(restart, rc);
1638                 }
1639         }
1640
1641         if (rc != 0) {
1642                 list_del_init(&req->rq_list);
1643                 spin_unlock(&imp->imp_lock);
1644                 req->rq_status = rc; // XXX this ok?
1645                 GOTO(out, rc);
1646         }
1647
1648         if (req->rq_resend) {
1649                 lustre_msg_add_flags(req->rq_reqmsg, MSG_RESENT);
1650
1651                 if (req->rq_bulk != NULL) {
1652                         ptlrpc_unregister_bulk (req);
1653
1654                         /* bulk requests are supposed to be
1655                          * idempotent, so we are free to bump the xid
1656                          * here, which we need to do before
1657                          * registering the bulk again (bug 6371).
1658                          * print the old xid first for sanity.
1659                          */
1660                         DEBUG_REQ(D_HA, req, "bumping xid for bulk: ");
1661                         req->rq_xid = ptlrpc_next_xid();
1662                 }
1663
1664                 DEBUG_REQ(D_HA, req, "resending: ");
1665         }
1666
1667         /* XXX this is the same as ptlrpc_set_wait */
1668         LASSERT(list_empty(&req->rq_list));
1669         list_add_tail(&req->rq_list, &imp->imp_sending_list);
1670         spin_unlock(&imp->imp_lock);
1671
1672         rc = sptlrpc_req_refresh_ctx(req, 0);
1673         if (rc) {
1674                 if (req->rq_err) {
1675                         /* we got fatal ctx refresh error, directly jump out
1676                          * thus we can pass back the actual error code.
1677                          */
1678                         spin_lock(&imp->imp_lock);
1679                         list_del_init(&req->rq_list);
1680                         spin_unlock(&imp->imp_lock);
1681
1682                         CERROR("Failed to refresh ctx of req %p: %d\n", req, rc);
1683                         GOTO(out, rc);
1684                 }
1685                 /* simulating we got error during send rpc */
1686                 goto after_send;
1687         }
1688
1689         rc = ptl_send_rpc(req, 0);
1690         if (rc) {
1691                 DEBUG_REQ(D_HA, req, "send failed (%d); recovering", rc);
1692                 timeout = CFS_TICK;
1693         } else {
1694                 timeout = cfs_timeout_cap(cfs_time_seconds(req->rq_timeout));
1695                 DEBUG_REQ(D_NET, req,
1696                           "-- sleeping for "CFS_DURATION_T" jiffies", timeout);
1697         }
1698 repeat:
1699         lwi = LWI_TIMEOUT_INTR(timeout, expired_request, interrupted_request,
1700                                req);
1701         rc = l_wait_event(req->rq_reply_waitq, ptlrpc_check_reply(req), &lwi);
1702         if (rc == -ETIMEDOUT && ptlrpc_check_and_wait_suspend(req))
1703                 goto repeat;
1704
1705 after_send:
1706         CDEBUG(D_RPCTRACE, "Completed RPC pname:cluuid:pid:xid:nid:opc "
1707                "%s:%s:%d:"LPU64":%s:%d\n", cfs_curproc_comm(),
1708                imp->imp_obd->obd_uuid.uuid,
1709                lustre_msg_get_status(req->rq_reqmsg), req->rq_xid,
1710                libcfs_nid2str(imp->imp_connection->c_peer.nid),
1711                lustre_msg_get_opc(req->rq_reqmsg));
1712
1713         spin_lock(&imp->imp_lock);
1714         list_del_init(&req->rq_list);
1715         spin_unlock(&imp->imp_lock);
1716
1717         /* If the reply was received normally, this just grabs the spinlock
1718          * (ensuring the reply callback has returned), sees that
1719          * req->rq_receiving_reply is clear and returns. */
1720         ptlrpc_unregister_reply (req);
1721
1722         if (req->rq_err)
1723                 GOTO(out, rc = -EIO);
1724
1725         /* Resend if we need to, unless we were interrupted. */
1726         if (req->rq_resend && !req->rq_intr) {
1727                 /* ...unless we were specifically told otherwise. */
1728                 if (req->rq_no_resend)
1729                         GOTO(out, rc = -ETIMEDOUT);
1730                 spin_lock(&imp->imp_lock);
1731                 goto restart;
1732         }
1733
1734         if (req->rq_intr) {
1735                 /* Should only be interrupted if we timed out. */
1736                 if (!req->rq_timedout)
1737                         DEBUG_REQ(D_ERROR, req,
1738                                   "rq_intr set but rq_timedout not");
1739                 GOTO(out, rc = -EINTR);
1740         }
1741
1742         if (req->rq_timedout) {                 /* non-recoverable timeout */
1743                 GOTO(out, rc = -ETIMEDOUT);
1744         }
1745
1746         if (!req->rq_replied) {
1747                 /* How can this be? -eeb */
1748                 DEBUG_REQ(D_ERROR, req, "!rq_replied: ");
1749                 LBUG();
1750                 GOTO(out, rc = req->rq_status);
1751         }
1752
1753         rc = after_reply(req);
1754         /* NB may return +ve success rc */
1755         if (req->rq_resend) {
1756                 spin_lock(&imp->imp_lock);
1757                 goto restart;
1758         }
1759
1760  out:
1761         if (req->rq_bulk != NULL) {
1762                 if (rc >= 0) {
1763                         /* success so far.  Note that anything going wrong
1764                          * with bulk now, is EXTREMELY strange, since the
1765                          * server must have believed that the bulk
1766                          * tranferred OK before she replied with success to
1767                          * me. */
1768                         lwi = LWI_TIMEOUT(timeout, NULL, NULL);
1769                         brc = l_wait_event(req->rq_reply_waitq,
1770                                            !ptlrpc_bulk_active(req->rq_bulk),
1771                                            &lwi);
1772                         LASSERT(brc == 0 || brc == -ETIMEDOUT);
1773                         if (brc != 0) {
1774                                 LASSERT(brc == -ETIMEDOUT);
1775                                 DEBUG_REQ(D_ERROR, req, "bulk timed out");
1776                                 rc = brc;
1777                         } else if (!req->rq_bulk->bd_success) {
1778                                 DEBUG_REQ(D_ERROR, req, "bulk transfer failed");
1779                                 rc = -EIO;
1780                         }
1781                 }
1782                 if (rc < 0)
1783                         ptlrpc_unregister_bulk (req);
1784         }
1785
1786         LASSERT(!req->rq_receiving_reply);
1787         req->rq_phase = RQ_PHASE_INTERPRET;
1788
1789         atomic_dec(&imp->imp_inflight);
1790         cfs_waitq_signal(&imp->imp_recovery_waitq);
1791         RETURN(rc);
1792 }
1793
1794 struct ptlrpc_replay_async_args {
1795         int praa_old_state;
1796         int praa_old_status;
1797 };
1798
1799 static int ptlrpc_replay_interpret(struct ptlrpc_request *req,
1800                                     void * data, int rc)
1801 {
1802         struct ptlrpc_replay_async_args *aa = data;
1803         struct obd_import *imp = req->rq_import;
1804
1805         ENTRY;
1806         atomic_dec(&imp->imp_replay_inflight);
1807
1808         if (!req->rq_replied) {
1809                 CERROR("request replay timed out, restarting recovery\n");
1810                 GOTO(out, rc = -ETIMEDOUT);
1811         }
1812
1813         if (lustre_msg_get_type(req->rq_repmsg) == PTL_RPC_MSG_ERR &&
1814             lustre_msg_get_status(req->rq_repmsg) == -ENOTCONN)
1815                 GOTO(out, rc = lustre_msg_get_status(req->rq_repmsg));
1816
1817         /* The transno had better not change over replay. */
1818         LASSERT(lustre_msg_get_transno(req->rq_reqmsg) ==
1819                 lustre_msg_get_transno(req->rq_repmsg));
1820
1821         DEBUG_REQ(D_HA, req, "got rep");
1822
1823         /* let the callback do fixups, possibly including in the request */
1824         if (req->rq_replay_cb)
1825                 req->rq_replay_cb(req);
1826
1827         if (req->rq_replied &&
1828             lustre_msg_get_status(req->rq_repmsg) != aa->praa_old_status) {
1829                 DEBUG_REQ(D_ERROR, req, "status %d, old was %d",
1830                           lustre_msg_get_status(req->rq_repmsg),
1831                           aa->praa_old_status);
1832         } else {
1833                 /* Put it back for re-replay. */
1834                 lustre_msg_set_status(req->rq_repmsg, aa->praa_old_status);
1835         }
1836
1837         /*
1838          * Errors while replay can set transno to 0, but
1839          * imp_last_replay_transno shouldn't be set to 0 anyway
1840          */
1841         if (req->rq_transno > 0) {
1842                 spin_lock(&imp->imp_lock);
1843                 LASSERT(req->rq_transno <= imp->imp_last_replay_transno);
1844                 imp->imp_last_replay_transno = req->rq_transno;
1845                 spin_unlock(&imp->imp_lock);
1846         } else
1847                 CERROR("Transno is 0 during replay!\n");
1848         /* continue with recovery */
1849         rc = ptlrpc_import_recovery_state_machine(imp);
1850  out:
1851         req->rq_send_state = aa->praa_old_state;
1852
1853         if (rc != 0)
1854                 /* this replay failed, so restart recovery */
1855                 ptlrpc_connect_import(imp, NULL);
1856
1857         RETURN(rc);
1858 }
1859
1860 int ptlrpc_replay_req(struct ptlrpc_request *req)
1861 {
1862         struct ptlrpc_replay_async_args *aa;
1863         ENTRY;
1864
1865         LASSERT(req->rq_import->imp_state == LUSTRE_IMP_REPLAY);
1866
1867         /* Not handling automatic bulk replay yet (or ever?) */
1868         LASSERT(req->rq_bulk == NULL);
1869
1870         DEBUG_REQ(D_HA, req, "REPLAY");
1871
1872         LASSERT (sizeof (*aa) <= sizeof (req->rq_async_args));
1873         aa = (struct ptlrpc_replay_async_args *)&req->rq_async_args;
1874         memset(aa, 0, sizeof *aa);
1875
1876         /* Prepare request to be resent with ptlrpcd */
1877         aa->praa_old_state = req->rq_send_state;
1878         req->rq_send_state = LUSTRE_IMP_REPLAY;
1879         req->rq_phase = RQ_PHASE_NEW;
1880         aa->praa_old_status = lustre_msg_get_status(req->rq_repmsg);
1881         req->rq_status = 0;
1882
1883         req->rq_interpret_reply = ptlrpc_replay_interpret;
1884         atomic_inc(&req->rq_import->imp_replay_inflight);
1885         ptlrpc_request_addref(req); /* ptlrpcd needs a ref */
1886
1887         ptlrpcd_add_req(req);
1888         RETURN(0);
1889 }
1890
1891 void ptlrpc_abort_inflight(struct obd_import *imp)
1892 {
1893         struct list_head *tmp, *n;
1894         ENTRY;
1895
1896         /* Make sure that no new requests get processed for this import.
1897          * ptlrpc_{queue,set}_wait must (and does) hold imp_lock while testing
1898          * this flag and then putting requests on sending_list or delayed_list.
1899          */
1900         spin_lock(&imp->imp_lock);
1901
1902         /* XXX locking?  Maybe we should remove each request with the list
1903          * locked?  Also, how do we know if the requests on the list are
1904          * being freed at this time?
1905          */
1906         list_for_each_safe(tmp, n, &imp->imp_sending_list) {
1907                 struct ptlrpc_request *req =
1908                         list_entry(tmp, struct ptlrpc_request, rq_list);
1909
1910                 DEBUG_REQ(D_HA, req, "inflight");
1911
1912                 spin_lock (&req->rq_lock);
1913                 if (req->rq_import_generation < imp->imp_generation) {
1914                         req->rq_err = 1;
1915                         ptlrpc_wake_client_req(req);
1916                 }
1917                 spin_unlock (&req->rq_lock);
1918         }
1919
1920         list_for_each_safe(tmp, n, &imp->imp_delayed_list) {
1921                 struct ptlrpc_request *req =
1922                         list_entry(tmp, struct ptlrpc_request, rq_list);
1923
1924                 DEBUG_REQ(D_HA, req, "aborting waiting req");
1925
1926                 spin_lock (&req->rq_lock);
1927                 if (req->rq_import_generation < imp->imp_generation) {
1928                         req->rq_err = 1;
1929                         ptlrpc_wake_client_req(req);
1930                 }
1931                 spin_unlock (&req->rq_lock);
1932         }
1933
1934         /* Last chance to free reqs left on the replay list, but we
1935          * will still leak reqs that haven't committed.  */
1936         if (imp->imp_replayable)
1937                 ptlrpc_free_committed(imp);
1938
1939         spin_unlock(&imp->imp_lock);
1940
1941         EXIT;
1942 }
1943
1944 static __u64 ptlrpc_last_xid = 0;
1945 spinlock_t ptlrpc_last_xid_lock;
1946
1947 __u64 ptlrpc_next_xid(void)
1948 {
1949         __u64 tmp;
1950         spin_lock(&ptlrpc_last_xid_lock);
1951         tmp = ++ptlrpc_last_xid;
1952         spin_unlock(&ptlrpc_last_xid_lock);
1953         return tmp;
1954 }
1955
1956 __u64 ptlrpc_sample_next_xid(void)
1957 {
1958         __u64 tmp;
1959         spin_lock(&ptlrpc_last_xid_lock);
1960         tmp = ptlrpc_last_xid + 1;
1961         spin_unlock(&ptlrpc_last_xid_lock);
1962         return tmp;
1963 }
1964 EXPORT_SYMBOL(ptlrpc_sample_next_xid);