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LU-13004 ptlrpc: simplify bd_vec access.
[fs/lustre-release.git] / lustre / ptlrpc / client.c
1 /*
2  * GPL HEADER START
3  *
4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2 only,
8  * as published by the Free Software Foundation.
9  *
10  * This program is distributed in the hope that it will be useful, but
11  * WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13  * General Public License version 2 for more details (a copy is included
14  * in the LICENSE file that accompanied this code).
15  *
16  * You should have received a copy of the GNU General Public License
17  * version 2 along with this program; If not, see
18  * http://www.gnu.org/licenses/gpl-2.0.html
19  *
20  * GPL HEADER END
21  */
22 /*
23  * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
24  * Use is subject to license terms.
25  *
26  * Copyright (c) 2011, 2017, Intel Corporation.
27  */
28 /*
29  * This file is part of Lustre, http://www.lustre.org/
30  * Lustre is a trademark of Sun Microsystems, Inc.
31  */
32
33 /** Implementation of client-side PortalRPC interfaces */
34
35 #define DEBUG_SUBSYSTEM S_RPC
36
37 #include <linux/delay.h>
38 #include <linux/random.h>
39
40 #include <lnet/lib-lnet.h>
41 #include <obd_support.h>
42 #include <obd_class.h>
43 #include <lustre_lib.h>
44 #include <lustre_ha.h>
45 #include <lustre_import.h>
46 #include <lustre_req_layout.h>
47
48 #include "ptlrpc_internal.h"
49
50 static void ptlrpc_prep_bulk_page_pin(struct ptlrpc_bulk_desc *desc,
51                                       struct page *page, int pageoffset,
52                                       int len)
53 {
54         __ptlrpc_prep_bulk_page(desc, page, pageoffset, len, 1);
55 }
56
57 static void ptlrpc_prep_bulk_page_nopin(struct ptlrpc_bulk_desc *desc,
58                                         struct page *page, int pageoffset,
59                                         int len)
60 {
61         __ptlrpc_prep_bulk_page(desc, page, pageoffset, len, 0);
62 }
63
64 static void ptlrpc_release_bulk_page_pin(struct ptlrpc_bulk_desc *desc)
65 {
66         int i;
67
68         for (i = 0; i < desc->bd_iov_count ; i++)
69                 put_page(desc->bd_vec[i].kiov_page);
70 }
71
72 static int ptlrpc_prep_bulk_frag_pages(struct ptlrpc_bulk_desc *desc,
73                                        void *frag, int len)
74 {
75         unsigned int offset = (unsigned long)frag & ~PAGE_MASK;
76
77         ENTRY;
78         while (len > 0) {
79                 int page_len = min_t(unsigned int, PAGE_SIZE - offset,
80                                      len);
81                 unsigned long vaddr = (unsigned long)frag;
82
83                 ptlrpc_prep_bulk_page_nopin(desc,
84                                             lnet_kvaddr_to_page(vaddr),
85                                             offset, page_len);
86                 offset = 0;
87                 len -= page_len;
88                 frag += page_len;
89         }
90
91         RETURN(desc->bd_nob);
92 }
93
94 const struct ptlrpc_bulk_frag_ops ptlrpc_bulk_kiov_pin_ops = {
95         .add_kiov_frag  = ptlrpc_prep_bulk_page_pin,
96         .release_frags  = ptlrpc_release_bulk_page_pin,
97 };
98 EXPORT_SYMBOL(ptlrpc_bulk_kiov_pin_ops);
99
100 const struct ptlrpc_bulk_frag_ops ptlrpc_bulk_kiov_nopin_ops = {
101         .add_kiov_frag  = ptlrpc_prep_bulk_page_nopin,
102         .release_frags  = ptlrpc_release_bulk_noop,
103         .add_iov_frag   = ptlrpc_prep_bulk_frag_pages,
104 };
105 EXPORT_SYMBOL(ptlrpc_bulk_kiov_nopin_ops);
106
107 static int ptlrpc_send_new_req(struct ptlrpc_request *req);
108 static int ptlrpcd_check_work(struct ptlrpc_request *req);
109 static int ptlrpc_unregister_reply(struct ptlrpc_request *request, int async);
110
111 /**
112  * Initialize passed in client structure \a cl.
113  */
114 void ptlrpc_init_client(int req_portal, int rep_portal, const char *name,
115                         struct ptlrpc_client *cl)
116 {
117         cl->cli_request_portal = req_portal;
118         cl->cli_reply_portal   = rep_portal;
119         cl->cli_name           = name;
120 }
121 EXPORT_SYMBOL(ptlrpc_init_client);
122
123 /**
124  * Return PortalRPC connection for remore uud \a uuid
125  */
126 struct ptlrpc_connection *ptlrpc_uuid_to_connection(struct obd_uuid *uuid,
127                                                     lnet_nid_t nid4refnet)
128 {
129         struct ptlrpc_connection *c;
130         lnet_nid_t self;
131         struct lnet_process_id peer;
132         int err;
133
134         /*
135          * ptlrpc_uuid_to_peer() initializes its 2nd parameter
136          * before accessing its values.
137          */
138         /* coverity[uninit_use_in_call] */
139         peer.nid = nid4refnet;
140         err = ptlrpc_uuid_to_peer(uuid, &peer, &self);
141         if (err != 0) {
142                 CNETERR("cannot find peer %s!\n", uuid->uuid);
143                 return NULL;
144         }
145
146         c = ptlrpc_connection_get(peer, self, uuid);
147         if (c) {
148                 memcpy(c->c_remote_uuid.uuid,
149                        uuid->uuid, sizeof(c->c_remote_uuid.uuid));
150         }
151
152         CDEBUG(D_INFO, "%s -> %p\n", uuid->uuid, c);
153
154         return c;
155 }
156
157 /**
158  * Allocate and initialize new bulk descriptor on the sender.
159  * Returns pointer to the descriptor or NULL on error.
160  */
161 struct ptlrpc_bulk_desc *ptlrpc_new_bulk(unsigned int nfrags,
162                                          unsigned int max_brw,
163                                          enum ptlrpc_bulk_op_type type,
164                                          unsigned int portal,
165                                          const struct ptlrpc_bulk_frag_ops *ops)
166 {
167         struct ptlrpc_bulk_desc *desc;
168         int i;
169
170         LASSERT(ops->add_kiov_frag != NULL);
171
172         OBD_ALLOC_PTR(desc);
173         if (!desc)
174                 return NULL;
175
176         OBD_ALLOC_LARGE(desc->bd_vec,
177                         nfrags * sizeof(*desc->bd_vec));
178         if (!desc->bd_vec)
179                 goto out;
180
181         spin_lock_init(&desc->bd_lock);
182         init_waitqueue_head(&desc->bd_waitq);
183         desc->bd_max_iov = nfrags;
184         desc->bd_iov_count = 0;
185         desc->bd_portal = portal;
186         desc->bd_type = type;
187         desc->bd_md_count = 0;
188         desc->bd_frag_ops = ops;
189         LASSERT(max_brw > 0);
190         desc->bd_md_max_brw = min(max_brw, PTLRPC_BULK_OPS_COUNT);
191         /*
192          * PTLRPC_BULK_OPS_COUNT is the compile-time transfer limit for this
193          * node. Negotiated ocd_brw_size will always be <= this number.
194          */
195         for (i = 0; i < PTLRPC_BULK_OPS_COUNT; i++)
196                 LNetInvalidateMDHandle(&desc->bd_mds[i]);
197
198         return desc;
199 out:
200         OBD_FREE_PTR(desc);
201         return NULL;
202 }
203
204 /**
205  * Prepare bulk descriptor for specified outgoing request \a req that
206  * can fit \a nfrags * pages. \a type is bulk type. \a portal is where
207  * the bulk to be sent. Used on client-side.
208  * Returns pointer to newly allocatrd initialized bulk descriptor or NULL on
209  * error.
210  */
211 struct ptlrpc_bulk_desc *ptlrpc_prep_bulk_imp(struct ptlrpc_request *req,
212                                               unsigned int nfrags,
213                                               unsigned int max_brw,
214                                               unsigned int type,
215                                               unsigned int portal,
216                                               const struct ptlrpc_bulk_frag_ops
217                                                 *ops)
218 {
219         struct obd_import *imp = req->rq_import;
220         struct ptlrpc_bulk_desc *desc;
221
222         ENTRY;
223         LASSERT(ptlrpc_is_bulk_op_passive(type));
224
225         desc = ptlrpc_new_bulk(nfrags, max_brw, type, portal, ops);
226         if (!desc)
227                 RETURN(NULL);
228
229         desc->bd_import = class_import_get(imp);
230         desc->bd_req = req;
231
232         desc->bd_cbid.cbid_fn  = client_bulk_callback;
233         desc->bd_cbid.cbid_arg = desc;
234
235         /* This makes req own desc, and free it when she frees herself */
236         req->rq_bulk = desc;
237
238         return desc;
239 }
240 EXPORT_SYMBOL(ptlrpc_prep_bulk_imp);
241
242 void __ptlrpc_prep_bulk_page(struct ptlrpc_bulk_desc *desc,
243                              struct page *page, int pageoffset, int len,
244                              int pin)
245 {
246         lnet_kiov_t *kiov;
247
248         LASSERT(desc->bd_iov_count < desc->bd_max_iov);
249         LASSERT(page != NULL);
250         LASSERT(pageoffset >= 0);
251         LASSERT(len > 0);
252         LASSERT(pageoffset + len <= PAGE_SIZE);
253
254         kiov = &desc->bd_vec[desc->bd_iov_count];
255
256         desc->bd_nob += len;
257
258         if (pin)
259                 get_page(page);
260
261         kiov->kiov_page = page;
262         kiov->kiov_offset = pageoffset;
263         kiov->kiov_len = len;
264
265         desc->bd_iov_count++;
266 }
267 EXPORT_SYMBOL(__ptlrpc_prep_bulk_page);
268
269 void ptlrpc_free_bulk(struct ptlrpc_bulk_desc *desc)
270 {
271         ENTRY;
272
273         LASSERT(desc != NULL);
274         LASSERT(desc->bd_iov_count != LI_POISON); /* not freed already */
275         LASSERT(desc->bd_md_count == 0);         /* network hands off */
276         LASSERT((desc->bd_export != NULL) ^ (desc->bd_import != NULL));
277         LASSERT(desc->bd_frag_ops != NULL);
278
279         sptlrpc_enc_pool_put_pages(desc);
280
281         if (desc->bd_export)
282                 class_export_put(desc->bd_export);
283         else
284                 class_import_put(desc->bd_import);
285
286         if (desc->bd_frag_ops->release_frags != NULL)
287                 desc->bd_frag_ops->release_frags(desc);
288
289         OBD_FREE_LARGE(desc->bd_vec,
290                        desc->bd_max_iov * sizeof(*desc->bd_vec));
291         OBD_FREE_PTR(desc);
292         EXIT;
293 }
294 EXPORT_SYMBOL(ptlrpc_free_bulk);
295
296 /**
297  * Set server timelimit for this req, i.e. how long are we willing to wait
298  * for reply before timing out this request.
299  */
300 void ptlrpc_at_set_req_timeout(struct ptlrpc_request *req)
301 {
302         __u32 serv_est;
303         int idx;
304         struct imp_at *at;
305
306         LASSERT(req->rq_import);
307
308         if (AT_OFF) {
309                 /* non-AT settings */
310                 /**
311                  * \a imp_server_timeout means this is reverse import and
312                  * we send (currently only) ASTs to the client and cannot afford
313                  * to wait too long for the reply, otherwise the other client
314                  * (because of which we are sending this request) would
315                  * timeout waiting for us
316                  */
317                 req->rq_timeout = req->rq_import->imp_server_timeout ?
318                                   obd_timeout / 2 : obd_timeout;
319         } else {
320                 at = &req->rq_import->imp_at;
321                 idx = import_at_get_index(req->rq_import,
322                                           req->rq_request_portal);
323                 serv_est = at_get(&at->iat_service_estimate[idx]);
324                 req->rq_timeout = at_est2timeout(serv_est);
325         }
326         /*
327          * We could get even fancier here, using history to predict increased
328          * loading...
329          */
330
331         /*
332          * Let the server know what this RPC timeout is by putting it in the
333          * reqmsg
334          */
335         lustre_msg_set_timeout(req->rq_reqmsg, req->rq_timeout);
336 }
337 EXPORT_SYMBOL(ptlrpc_at_set_req_timeout);
338
339 /* Adjust max service estimate based on server value */
340 static void ptlrpc_at_adj_service(struct ptlrpc_request *req,
341                                   unsigned int serv_est)
342 {
343         int idx;
344         unsigned int oldse;
345         struct imp_at *at;
346
347         LASSERT(req->rq_import);
348         at = &req->rq_import->imp_at;
349
350         idx = import_at_get_index(req->rq_import, req->rq_request_portal);
351         /*
352          * max service estimates are tracked on the server side,
353          * so just keep minimal history here
354          */
355         oldse = at_measured(&at->iat_service_estimate[idx], serv_est);
356         if (oldse != 0)
357                 CDEBUG(D_ADAPTTO,
358                        "The RPC service estimate for %s ptl %d has changed from %d to %d\n",
359                        req->rq_import->imp_obd->obd_name,
360                        req->rq_request_portal,
361                        oldse, at_get(&at->iat_service_estimate[idx]));
362 }
363
364 /* Expected network latency per remote node (secs) */
365 int ptlrpc_at_get_net_latency(struct ptlrpc_request *req)
366 {
367         return AT_OFF ? 0 : at_get(&req->rq_import->imp_at.iat_net_latency);
368 }
369
370 /* Adjust expected network latency */
371 void ptlrpc_at_adj_net_latency(struct ptlrpc_request *req,
372                                unsigned int service_time)
373 {
374         unsigned int nl, oldnl;
375         struct imp_at *at;
376         time64_t now = ktime_get_real_seconds();
377
378         LASSERT(req->rq_import);
379
380         if (service_time > now - req->rq_sent + 3) {
381                 /*
382                  * b=16408, however, this can also happen if early reply
383                  * is lost and client RPC is expired and resent, early reply
384                  * or reply of original RPC can still be fit in reply buffer
385                  * of resent RPC, now client is measuring time from the
386                  * resent time, but server sent back service time of original
387                  * RPC.
388                  */
389                 CDEBUG((lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT) ?
390                        D_ADAPTTO : D_WARNING,
391                        "Reported service time %u > total measured time %lld\n",
392                        service_time, now - req->rq_sent);
393                 return;
394         }
395
396         /* Network latency is total time less server processing time */
397         nl = max_t(int, now - req->rq_sent -
398                         service_time, 0) + 1; /* st rounding */
399         at = &req->rq_import->imp_at;
400
401         oldnl = at_measured(&at->iat_net_latency, nl);
402         if (oldnl != 0)
403                 CDEBUG(D_ADAPTTO,
404                        "The network latency for %s (nid %s) has changed from %d to %d\n",
405                        req->rq_import->imp_obd->obd_name,
406                        obd_uuid2str(&req->rq_import->imp_connection->c_remote_uuid),
407                        oldnl, at_get(&at->iat_net_latency));
408 }
409
410 static int unpack_reply(struct ptlrpc_request *req)
411 {
412         int rc;
413
414         if (SPTLRPC_FLVR_POLICY(req->rq_flvr.sf_rpc) != SPTLRPC_POLICY_NULL) {
415                 rc = ptlrpc_unpack_rep_msg(req, req->rq_replen);
416                 if (rc) {
417                         DEBUG_REQ(D_ERROR, req, "unpack_rep failed: rc = %d",
418                                   rc);
419                         return -EPROTO;
420                 }
421         }
422
423         rc = lustre_unpack_rep_ptlrpc_body(req, MSG_PTLRPC_BODY_OFF);
424         if (rc) {
425                 DEBUG_REQ(D_ERROR, req, "unpack ptlrpc body failed: rc = %d",
426                           rc);
427                 return -EPROTO;
428         }
429         return 0;
430 }
431
432 /**
433  * Handle an early reply message, called with the rq_lock held.
434  * If anything goes wrong just ignore it - same as if it never happened
435  */
436 static int ptlrpc_at_recv_early_reply(struct ptlrpc_request *req)
437 __must_hold(&req->rq_lock)
438 {
439         struct ptlrpc_request *early_req;
440         time64_t olddl;
441         int rc;
442
443         ENTRY;
444         req->rq_early = 0;
445         spin_unlock(&req->rq_lock);
446
447         rc = sptlrpc_cli_unwrap_early_reply(req, &early_req);
448         if (rc) {
449                 spin_lock(&req->rq_lock);
450                 RETURN(rc);
451         }
452
453         rc = unpack_reply(early_req);
454         if (rc != 0) {
455                 sptlrpc_cli_finish_early_reply(early_req);
456                 spin_lock(&req->rq_lock);
457                 RETURN(rc);
458         }
459
460         /*
461          * Use new timeout value just to adjust the local value for this
462          * request, don't include it into at_history. It is unclear yet why
463          * service time increased and should it be counted or skipped, e.g.
464          * that can be recovery case or some error or server, the real reply
465          * will add all new data if it is worth to add.
466          */
467         req->rq_timeout = lustre_msg_get_timeout(early_req->rq_repmsg);
468         lustre_msg_set_timeout(req->rq_reqmsg, req->rq_timeout);
469
470         /* Network latency can be adjusted, it is pure network delays */
471         ptlrpc_at_adj_net_latency(req,
472                                   lustre_msg_get_service_time(early_req->rq_repmsg));
473
474         sptlrpc_cli_finish_early_reply(early_req);
475
476         spin_lock(&req->rq_lock);
477         olddl = req->rq_deadline;
478         /*
479          * server assumes it now has rq_timeout from when the request
480          * arrived, so the client should give it at least that long.
481          * since we don't know the arrival time we'll use the original
482          * sent time
483          */
484         req->rq_deadline = req->rq_sent + req->rq_timeout +
485                            ptlrpc_at_get_net_latency(req);
486
487         /* The below message is checked in replay-single.sh test_65{a,b} */
488         /* The below message is checked in sanity-{gss,krb5} test_8 */
489         DEBUG_REQ(D_ADAPTTO, req,
490                   "Early reply #%d, new deadline in %llds (%llds)",
491                   req->rq_early_count,
492                   req->rq_deadline - ktime_get_real_seconds(),
493                   req->rq_deadline - olddl);
494
495         RETURN(rc);
496 }
497
498 static struct kmem_cache *request_cache;
499
500 int ptlrpc_request_cache_init(void)
501 {
502         request_cache = kmem_cache_create("ptlrpc_cache",
503                                           sizeof(struct ptlrpc_request),
504                                           0, SLAB_HWCACHE_ALIGN, NULL);
505         return request_cache ? 0 : -ENOMEM;
506 }
507
508 void ptlrpc_request_cache_fini(void)
509 {
510         kmem_cache_destroy(request_cache);
511 }
512
513 struct ptlrpc_request *ptlrpc_request_cache_alloc(gfp_t flags)
514 {
515         struct ptlrpc_request *req;
516
517         OBD_SLAB_ALLOC_PTR_GFP(req, request_cache, flags);
518         return req;
519 }
520
521 void ptlrpc_request_cache_free(struct ptlrpc_request *req)
522 {
523         OBD_SLAB_FREE_PTR(req, request_cache);
524 }
525
526 /**
527  * Wind down request pool \a pool.
528  * Frees all requests from the pool too
529  */
530 void ptlrpc_free_rq_pool(struct ptlrpc_request_pool *pool)
531 {
532         struct list_head *l, *tmp;
533         struct ptlrpc_request *req;
534
535         LASSERT(pool != NULL);
536
537         spin_lock(&pool->prp_lock);
538         list_for_each_safe(l, tmp, &pool->prp_req_list) {
539                 req = list_entry(l, struct ptlrpc_request, rq_list);
540                 list_del(&req->rq_list);
541                 LASSERT(req->rq_reqbuf);
542                 LASSERT(req->rq_reqbuf_len == pool->prp_rq_size);
543                 OBD_FREE_LARGE(req->rq_reqbuf, pool->prp_rq_size);
544                 ptlrpc_request_cache_free(req);
545         }
546         spin_unlock(&pool->prp_lock);
547         OBD_FREE(pool, sizeof(*pool));
548 }
549 EXPORT_SYMBOL(ptlrpc_free_rq_pool);
550
551 /**
552  * Allocates, initializes and adds \a num_rq requests to the pool \a pool
553  */
554 int ptlrpc_add_rqs_to_pool(struct ptlrpc_request_pool *pool, int num_rq)
555 {
556         int i;
557         int size = 1;
558
559         while (size < pool->prp_rq_size)
560                 size <<= 1;
561
562         LASSERTF(list_empty(&pool->prp_req_list) ||
563                  size == pool->prp_rq_size,
564                  "Trying to change pool size with nonempty pool from %d to %d bytes\n",
565                  pool->prp_rq_size, size);
566
567         pool->prp_rq_size = size;
568         for (i = 0; i < num_rq; i++) {
569                 struct ptlrpc_request *req;
570                 struct lustre_msg *msg;
571
572                 req = ptlrpc_request_cache_alloc(GFP_NOFS);
573                 if (!req)
574                         return i;
575                 OBD_ALLOC_LARGE(msg, size);
576                 if (!msg) {
577                         ptlrpc_request_cache_free(req);
578                         return i;
579                 }
580                 req->rq_reqbuf = msg;
581                 req->rq_reqbuf_len = size;
582                 req->rq_pool = pool;
583                 spin_lock(&pool->prp_lock);
584                 list_add_tail(&req->rq_list, &pool->prp_req_list);
585                 spin_unlock(&pool->prp_lock);
586         }
587         return num_rq;
588 }
589 EXPORT_SYMBOL(ptlrpc_add_rqs_to_pool);
590
591 /**
592  * Create and initialize new request pool with given attributes:
593  * \a num_rq - initial number of requests to create for the pool
594  * \a msgsize - maximum message size possible for requests in thid pool
595  * \a populate_pool - function to be called when more requests need to be added
596  *                    to the pool
597  * Returns pointer to newly created pool or NULL on error.
598  */
599 struct ptlrpc_request_pool *
600 ptlrpc_init_rq_pool(int num_rq, int msgsize,
601                     int (*populate_pool)(struct ptlrpc_request_pool *, int))
602 {
603         struct ptlrpc_request_pool *pool;
604
605         OBD_ALLOC_PTR(pool);
606         if (!pool)
607                 return NULL;
608
609         /*
610          * Request next power of two for the allocation, because internally
611          * kernel would do exactly this
612          */
613         spin_lock_init(&pool->prp_lock);
614         INIT_LIST_HEAD(&pool->prp_req_list);
615         pool->prp_rq_size = msgsize + SPTLRPC_MAX_PAYLOAD;
616         pool->prp_populate = populate_pool;
617
618         populate_pool(pool, num_rq);
619
620         return pool;
621 }
622 EXPORT_SYMBOL(ptlrpc_init_rq_pool);
623
624 /**
625  * Fetches one request from pool \a pool
626  */
627 static struct ptlrpc_request *
628 ptlrpc_prep_req_from_pool(struct ptlrpc_request_pool *pool)
629 {
630         struct ptlrpc_request *request;
631         struct lustre_msg *reqbuf;
632
633         if (!pool)
634                 return NULL;
635
636         spin_lock(&pool->prp_lock);
637
638         /*
639          * See if we have anything in a pool, and bail out if nothing,
640          * in writeout path, where this matters, this is safe to do, because
641          * nothing is lost in this case, and when some in-flight requests
642          * complete, this code will be called again.
643          */
644         if (unlikely(list_empty(&pool->prp_req_list))) {
645                 spin_unlock(&pool->prp_lock);
646                 return NULL;
647         }
648
649         request = list_entry(pool->prp_req_list.next, struct ptlrpc_request,
650                              rq_list);
651         list_del_init(&request->rq_list);
652         spin_unlock(&pool->prp_lock);
653
654         LASSERT(request->rq_reqbuf);
655         LASSERT(request->rq_pool);
656
657         reqbuf = request->rq_reqbuf;
658         memset(request, 0, sizeof(*request));
659         request->rq_reqbuf = reqbuf;
660         request->rq_reqbuf_len = pool->prp_rq_size;
661         request->rq_pool = pool;
662
663         return request;
664 }
665
666 /**
667  * Returns freed \a request to pool.
668  */
669 static void __ptlrpc_free_req_to_pool(struct ptlrpc_request *request)
670 {
671         struct ptlrpc_request_pool *pool = request->rq_pool;
672
673         spin_lock(&pool->prp_lock);
674         LASSERT(list_empty(&request->rq_list));
675         LASSERT(!request->rq_receiving_reply);
676         list_add_tail(&request->rq_list, &pool->prp_req_list);
677         spin_unlock(&pool->prp_lock);
678 }
679
680 void ptlrpc_add_unreplied(struct ptlrpc_request *req)
681 {
682         struct obd_import *imp = req->rq_import;
683         struct list_head *tmp;
684         struct ptlrpc_request *iter;
685
686         assert_spin_locked(&imp->imp_lock);
687         LASSERT(list_empty(&req->rq_unreplied_list));
688
689         /* unreplied list is sorted by xid in ascending order */
690         list_for_each_prev(tmp, &imp->imp_unreplied_list) {
691                 iter = list_entry(tmp, struct ptlrpc_request,
692                                   rq_unreplied_list);
693
694                 LASSERT(req->rq_xid != iter->rq_xid);
695                 if (req->rq_xid < iter->rq_xid)
696                         continue;
697                 list_add(&req->rq_unreplied_list, &iter->rq_unreplied_list);
698                 return;
699         }
700         list_add(&req->rq_unreplied_list, &imp->imp_unreplied_list);
701 }
702
703 void ptlrpc_assign_next_xid_nolock(struct ptlrpc_request *req)
704 {
705         req->rq_xid = ptlrpc_next_xid();
706         ptlrpc_add_unreplied(req);
707 }
708
709 static inline void ptlrpc_assign_next_xid(struct ptlrpc_request *req)
710 {
711         spin_lock(&req->rq_import->imp_lock);
712         ptlrpc_assign_next_xid_nolock(req);
713         spin_unlock(&req->rq_import->imp_lock);
714 }
715
716 static atomic64_t ptlrpc_last_xid;
717
718 static void ptlrpc_reassign_next_xid(struct ptlrpc_request *req)
719 {
720         spin_lock(&req->rq_import->imp_lock);
721         list_del_init(&req->rq_unreplied_list);
722         ptlrpc_assign_next_xid_nolock(req);
723         spin_unlock(&req->rq_import->imp_lock);
724         DEBUG_REQ(D_RPCTRACE, req, "reassign xid");
725 }
726
727 void ptlrpc_get_mod_rpc_slot(struct ptlrpc_request *req)
728 {
729         struct client_obd *cli = &req->rq_import->imp_obd->u.cli;
730         __u32 opc;
731         __u16 tag;
732
733         opc = lustre_msg_get_opc(req->rq_reqmsg);
734         tag = obd_get_mod_rpc_slot(cli, opc);
735         lustre_msg_set_tag(req->rq_reqmsg, tag);
736         ptlrpc_reassign_next_xid(req);
737 }
738 EXPORT_SYMBOL(ptlrpc_get_mod_rpc_slot);
739
740 void ptlrpc_put_mod_rpc_slot(struct ptlrpc_request *req)
741 {
742         __u16 tag = lustre_msg_get_tag(req->rq_reqmsg);
743
744         if (tag != 0) {
745                 struct client_obd *cli = &req->rq_import->imp_obd->u.cli;
746                 __u32 opc = lustre_msg_get_opc(req->rq_reqmsg);
747
748                 obd_put_mod_rpc_slot(cli, opc, tag);
749         }
750 }
751 EXPORT_SYMBOL(ptlrpc_put_mod_rpc_slot);
752
753 int ptlrpc_request_bufs_pack(struct ptlrpc_request *request,
754                              __u32 version, int opcode, char **bufs,
755                              struct ptlrpc_cli_ctx *ctx)
756 {
757         int count;
758         struct obd_import *imp;
759         __u32 *lengths;
760         int rc;
761
762         ENTRY;
763
764         count = req_capsule_filled_sizes(&request->rq_pill, RCL_CLIENT);
765         imp = request->rq_import;
766         lengths = request->rq_pill.rc_area[RCL_CLIENT];
767
768         if (ctx) {
769                 request->rq_cli_ctx = sptlrpc_cli_ctx_get(ctx);
770         } else {
771                 rc = sptlrpc_req_get_ctx(request);
772                 if (rc)
773                         GOTO(out_free, rc);
774         }
775         sptlrpc_req_set_flavor(request, opcode);
776
777         rc = lustre_pack_request(request, imp->imp_msg_magic, count,
778                                  lengths, bufs);
779         if (rc)
780                 GOTO(out_ctx, rc);
781
782         lustre_msg_add_version(request->rq_reqmsg, version);
783         request->rq_send_state = LUSTRE_IMP_FULL;
784         request->rq_type = PTL_RPC_MSG_REQUEST;
785
786         request->rq_req_cbid.cbid_fn  = request_out_callback;
787         request->rq_req_cbid.cbid_arg = request;
788
789         request->rq_reply_cbid.cbid_fn  = reply_in_callback;
790         request->rq_reply_cbid.cbid_arg = request;
791
792         request->rq_reply_deadline = 0;
793         request->rq_bulk_deadline = 0;
794         request->rq_req_deadline = 0;
795         request->rq_phase = RQ_PHASE_NEW;
796         request->rq_next_phase = RQ_PHASE_UNDEFINED;
797
798         request->rq_request_portal = imp->imp_client->cli_request_portal;
799         request->rq_reply_portal = imp->imp_client->cli_reply_portal;
800
801         ptlrpc_at_set_req_timeout(request);
802
803         lustre_msg_set_opc(request->rq_reqmsg, opcode);
804
805         /* Let's setup deadline for req/reply/bulk unlink for opcode. */
806         if (cfs_fail_val == opcode) {
807                 time64_t *fail_t = NULL, *fail2_t = NULL;
808
809                 if (CFS_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_BULK_UNLINK)) {
810                         fail_t = &request->rq_bulk_deadline;
811                 } else if (CFS_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_REPL_UNLINK)) {
812                         fail_t = &request->rq_reply_deadline;
813                 } else if (CFS_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_REQ_UNLINK)) {
814                         fail_t = &request->rq_req_deadline;
815                 } else if (CFS_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_BOTH_UNLINK)) {
816                         fail_t = &request->rq_reply_deadline;
817                         fail2_t = &request->rq_bulk_deadline;
818                 } else if (CFS_FAIL_CHECK(OBD_FAIL_PTLRPC_ROUND_XID)) {
819                         time64_t now = ktime_get_real_seconds();
820                         u64 xid = ((u64)now >> 4) << 24;
821
822                         atomic64_set(&ptlrpc_last_xid, xid);
823                 }
824
825                 if (fail_t) {
826                         *fail_t = ktime_get_real_seconds() + LONG_UNLINK;
827
828                         if (fail2_t)
829                                 *fail2_t = ktime_get_real_seconds() +
830                                            LONG_UNLINK;
831
832                         /*
833                          * The RPC is infected, let the test to change the
834                          * fail_loc
835                          */
836                         msleep(4 * MSEC_PER_SEC);
837                 }
838         }
839         ptlrpc_assign_next_xid(request);
840
841         RETURN(0);
842
843 out_ctx:
844         LASSERT(!request->rq_pool);
845         sptlrpc_cli_ctx_put(request->rq_cli_ctx, 1);
846 out_free:
847         class_import_put(imp);
848
849         return rc;
850 }
851 EXPORT_SYMBOL(ptlrpc_request_bufs_pack);
852
853 /**
854  * Pack request buffers for network transfer, performing necessary encryption
855  * steps if necessary.
856  */
857 int ptlrpc_request_pack(struct ptlrpc_request *request,
858                         __u32 version, int opcode)
859 {
860         return ptlrpc_request_bufs_pack(request, version, opcode, NULL, NULL);
861 }
862 EXPORT_SYMBOL(ptlrpc_request_pack);
863
864 /**
865  * Helper function to allocate new request on import \a imp
866  * and possibly using existing request from pool \a pool if provided.
867  * Returns allocated request structure with import field filled or
868  * NULL on error.
869  */
870 static inline
871 struct ptlrpc_request *__ptlrpc_request_alloc(struct obd_import *imp,
872                                               struct ptlrpc_request_pool *pool)
873 {
874         struct ptlrpc_request *request = NULL;
875
876         request = ptlrpc_request_cache_alloc(GFP_NOFS);
877
878         if (!request && pool)
879                 request = ptlrpc_prep_req_from_pool(pool);
880
881         if (request) {
882                 ptlrpc_cli_req_init(request);
883
884                 LASSERTF((unsigned long)imp > 0x1000, "%p", imp);
885                 LASSERT(imp != LP_POISON);
886                 LASSERTF((unsigned long)imp->imp_client > 0x1000, "%p\n",
887                          imp->imp_client);
888                 LASSERT(imp->imp_client != LP_POISON);
889
890                 request->rq_import = class_import_get(imp);
891         } else {
892                 CERROR("request allocation out of memory\n");
893         }
894
895         return request;
896 }
897
898 /**
899  * Helper function for creating a request.
900  * Calls __ptlrpc_request_alloc to allocate new request sturcture and inits
901  * buffer structures according to capsule template \a format.
902  * Returns allocated request structure pointer or NULL on error.
903  */
904 static struct ptlrpc_request *
905 ptlrpc_request_alloc_internal(struct obd_import *imp,
906                               struct ptlrpc_request_pool *pool,
907                               const struct req_format *format)
908 {
909         struct ptlrpc_request *request;
910
911         request = __ptlrpc_request_alloc(imp, pool);
912         if (!request)
913                 return NULL;
914
915         /*
916          * initiate connection if needed when the import has been
917          * referenced by the new request to avoid races with disconnect
918          */
919         if (unlikely(imp->imp_state == LUSTRE_IMP_IDLE)) {
920                 int rc;
921
922                 CDEBUG_LIMIT(imp->imp_idle_debug,
923                              "%s: reconnect after %llds idle\n",
924                              imp->imp_obd->obd_name, ktime_get_real_seconds() -
925                                                      imp->imp_last_reply_time);
926                 spin_lock(&imp->imp_lock);
927                 if (imp->imp_state == LUSTRE_IMP_IDLE) {
928                         imp->imp_generation++;
929                         imp->imp_initiated_at = imp->imp_generation;
930                         imp->imp_state = LUSTRE_IMP_NEW;
931
932                         /* connect_import_locked releases imp_lock */
933                         rc = ptlrpc_connect_import_locked(imp);
934                         if (rc < 0) {
935                                 ptlrpc_request_free(request);
936                                 return NULL;
937                         }
938                         ptlrpc_pinger_add_import(imp);
939                 } else {
940                         spin_unlock(&imp->imp_lock);
941                 }
942         }
943
944         req_capsule_init(&request->rq_pill, request, RCL_CLIENT);
945         req_capsule_set(&request->rq_pill, format);
946         return request;
947 }
948
949 /**
950  * Allocate new request structure for import \a imp and initialize its
951  * buffer structure according to capsule template \a format.
952  */
953 struct ptlrpc_request *ptlrpc_request_alloc(struct obd_import *imp,
954                                             const struct req_format *format)
955 {
956         return ptlrpc_request_alloc_internal(imp, NULL, format);
957 }
958 EXPORT_SYMBOL(ptlrpc_request_alloc);
959
960 /**
961  * Allocate new request structure for import \a imp from pool \a pool and
962  * initialize its buffer structure according to capsule template \a format.
963  */
964 struct ptlrpc_request *
965 ptlrpc_request_alloc_pool(struct obd_import *imp,
966                           struct ptlrpc_request_pool *pool,
967                           const struct req_format *format)
968 {
969         return ptlrpc_request_alloc_internal(imp, pool, format);
970 }
971 EXPORT_SYMBOL(ptlrpc_request_alloc_pool);
972
973 /**
974  * For requests not from pool, free memory of the request structure.
975  * For requests obtained from a pool earlier, return request back to pool.
976  */
977 void ptlrpc_request_free(struct ptlrpc_request *request)
978 {
979         if (request->rq_pool)
980                 __ptlrpc_free_req_to_pool(request);
981         else
982                 ptlrpc_request_cache_free(request);
983 }
984 EXPORT_SYMBOL(ptlrpc_request_free);
985
986 /**
987  * Allocate new request for operatione \a opcode and immediatelly pack it for
988  * network transfer.
989  * Only used for simple requests like OBD_PING where the only important
990  * part of the request is operation itself.
991  * Returns allocated request or NULL on error.
992  */
993 struct ptlrpc_request *ptlrpc_request_alloc_pack(struct obd_import *imp,
994                                                  const struct req_format *format,
995                                                  __u32 version, int opcode)
996 {
997         struct ptlrpc_request *req = ptlrpc_request_alloc(imp, format);
998         int rc;
999
1000         if (req) {
1001                 rc = ptlrpc_request_pack(req, version, opcode);
1002                 if (rc) {
1003                         ptlrpc_request_free(req);
1004                         req = NULL;
1005                 }
1006         }
1007         return req;
1008 }
1009 EXPORT_SYMBOL(ptlrpc_request_alloc_pack);
1010
1011 /**
1012  * Allocate and initialize new request set structure on the current CPT.
1013  * Returns a pointer to the newly allocated set structure or NULL on error.
1014  */
1015 struct ptlrpc_request_set *ptlrpc_prep_set(void)
1016 {
1017         struct ptlrpc_request_set *set;
1018         int cpt;
1019
1020         ENTRY;
1021         cpt = cfs_cpt_current(cfs_cpt_tab, 0);
1022         OBD_CPT_ALLOC(set, cfs_cpt_tab, cpt, sizeof(*set));
1023         if (!set)
1024                 RETURN(NULL);
1025         atomic_set(&set->set_refcount, 1);
1026         INIT_LIST_HEAD(&set->set_requests);
1027         init_waitqueue_head(&set->set_waitq);
1028         atomic_set(&set->set_new_count, 0);
1029         atomic_set(&set->set_remaining, 0);
1030         spin_lock_init(&set->set_new_req_lock);
1031         INIT_LIST_HEAD(&set->set_new_requests);
1032         set->set_max_inflight = UINT_MAX;
1033         set->set_producer     = NULL;
1034         set->set_producer_arg = NULL;
1035         set->set_rc           = 0;
1036
1037         RETURN(set);
1038 }
1039 EXPORT_SYMBOL(ptlrpc_prep_set);
1040
1041 /**
1042  * Allocate and initialize new request set structure with flow control
1043  * extension. This extension allows to control the number of requests in-flight
1044  * for the whole set. A callback function to generate requests must be provided
1045  * and the request set will keep the number of requests sent over the wire to
1046  * @max_inflight.
1047  * Returns a pointer to the newly allocated set structure or NULL on error.
1048  */
1049 struct ptlrpc_request_set *ptlrpc_prep_fcset(int max, set_producer_func func,
1050                                              void *arg)
1051
1052 {
1053         struct ptlrpc_request_set *set;
1054
1055         set = ptlrpc_prep_set();
1056         if (!set)
1057                 RETURN(NULL);
1058
1059         set->set_max_inflight  = max;
1060         set->set_producer      = func;
1061         set->set_producer_arg  = arg;
1062
1063         RETURN(set);
1064 }
1065
1066 /**
1067  * Wind down and free request set structure previously allocated with
1068  * ptlrpc_prep_set.
1069  * Ensures that all requests on the set have completed and removes
1070  * all requests from the request list in a set.
1071  * If any unsent request happen to be on the list, pretends that they got
1072  * an error in flight and calls their completion handler.
1073  */
1074 void ptlrpc_set_destroy(struct ptlrpc_request_set *set)
1075 {
1076         struct list_head *tmp;
1077         struct list_head *next;
1078         int expected_phase;
1079         int n = 0;
1080
1081         ENTRY;
1082
1083         /* Requests on the set should either all be completed, or all be new */
1084         expected_phase = (atomic_read(&set->set_remaining) == 0) ?
1085                          RQ_PHASE_COMPLETE : RQ_PHASE_NEW;
1086         list_for_each(tmp, &set->set_requests) {
1087                 struct ptlrpc_request *req =
1088                         list_entry(tmp, struct ptlrpc_request,
1089                                    rq_set_chain);
1090
1091                 LASSERT(req->rq_phase == expected_phase);
1092                 n++;
1093         }
1094
1095         LASSERTF(atomic_read(&set->set_remaining) == 0 ||
1096                  atomic_read(&set->set_remaining) == n, "%d / %d\n",
1097                  atomic_read(&set->set_remaining), n);
1098
1099         list_for_each_safe(tmp, next, &set->set_requests) {
1100                 struct ptlrpc_request *req =
1101                         list_entry(tmp, struct ptlrpc_request,
1102                                    rq_set_chain);
1103                 list_del_init(&req->rq_set_chain);
1104
1105                 LASSERT(req->rq_phase == expected_phase);
1106
1107                 if (req->rq_phase == RQ_PHASE_NEW) {
1108                         ptlrpc_req_interpret(NULL, req, -EBADR);
1109                         atomic_dec(&set->set_remaining);
1110                 }
1111
1112                 spin_lock(&req->rq_lock);
1113                 req->rq_set = NULL;
1114                 req->rq_invalid_rqset = 0;
1115                 spin_unlock(&req->rq_lock);
1116
1117                 ptlrpc_req_finished(req);
1118         }
1119
1120         LASSERT(atomic_read(&set->set_remaining) == 0);
1121
1122         ptlrpc_reqset_put(set);
1123         EXIT;
1124 }
1125 EXPORT_SYMBOL(ptlrpc_set_destroy);
1126
1127 /**
1128  * Add a new request to the general purpose request set.
1129  * Assumes request reference from the caller.
1130  */
1131 void ptlrpc_set_add_req(struct ptlrpc_request_set *set,
1132                         struct ptlrpc_request *req)
1133 {
1134         if (set == PTLRPCD_SET) {
1135                 ptlrpcd_add_req(req);
1136                 return;
1137         }
1138
1139         LASSERT(req->rq_import->imp_state != LUSTRE_IMP_IDLE);
1140         LASSERT(list_empty(&req->rq_set_chain));
1141
1142         if (req->rq_allow_intr)
1143                 set->set_allow_intr = 1;
1144
1145         /* The set takes over the caller's request reference */
1146         list_add_tail(&req->rq_set_chain, &set->set_requests);
1147         req->rq_set = set;
1148         atomic_inc(&set->set_remaining);
1149         req->rq_queued_time = ktime_get_seconds();
1150
1151         if (req->rq_reqmsg)
1152                 lustre_msg_set_jobid(req->rq_reqmsg, NULL);
1153
1154         if (set->set_producer)
1155                 /*
1156                  * If the request set has a producer callback, the RPC must be
1157                  * sent straight away
1158                  */
1159                 ptlrpc_send_new_req(req);
1160 }
1161 EXPORT_SYMBOL(ptlrpc_set_add_req);
1162
1163 /**
1164  * Add a request to a request with dedicated server thread
1165  * and wake the thread to make any necessary processing.
1166  * Currently only used for ptlrpcd.
1167  */
1168 void ptlrpc_set_add_new_req(struct ptlrpcd_ctl *pc,
1169                             struct ptlrpc_request *req)
1170 {
1171         struct ptlrpc_request_set *set = pc->pc_set;
1172         int count, i;
1173
1174         LASSERT(req->rq_set == NULL);
1175         LASSERT(test_bit(LIOD_STOP, &pc->pc_flags) == 0);
1176
1177         spin_lock(&set->set_new_req_lock);
1178         /*
1179          * The set takes over the caller's request reference.
1180          */
1181         req->rq_set = set;
1182         req->rq_queued_time = ktime_get_seconds();
1183         list_add_tail(&req->rq_set_chain, &set->set_new_requests);
1184         count = atomic_inc_return(&set->set_new_count);
1185         spin_unlock(&set->set_new_req_lock);
1186
1187         /* Only need to call wakeup once for the first entry. */
1188         if (count == 1) {
1189                 wake_up(&set->set_waitq);
1190
1191                 /*
1192                  * XXX: It maybe unnecessary to wakeup all the partners. But to
1193                  *      guarantee the async RPC can be processed ASAP, we have
1194                  *      no other better choice. It maybe fixed in future.
1195                  */
1196                 for (i = 0; i < pc->pc_npartners; i++)
1197                         wake_up(&pc->pc_partners[i]->pc_set->set_waitq);
1198         }
1199 }
1200
1201 /**
1202  * Based on the current state of the import, determine if the request
1203  * can be sent, is an error, or should be delayed.
1204  *
1205  * Returns true if this request should be delayed. If false, and
1206  * *status is set, then the request can not be sent and *status is the
1207  * error code.  If false and status is 0, then request can be sent.
1208  *
1209  * The imp->imp_lock must be held.
1210  */
1211 static int ptlrpc_import_delay_req(struct obd_import *imp,
1212                                    struct ptlrpc_request *req, int *status)
1213 {
1214         int delay = 0;
1215
1216         ENTRY;
1217         LASSERT(status);
1218         *status = 0;
1219
1220         if (req->rq_ctx_init || req->rq_ctx_fini) {
1221                 /* always allow ctx init/fini rpc go through */
1222         } else if (imp->imp_state == LUSTRE_IMP_NEW) {
1223                 DEBUG_REQ(D_ERROR, req, "Uninitialized import");
1224                 *status = -EIO;
1225         } else if (imp->imp_state == LUSTRE_IMP_CLOSED) {
1226                 unsigned int opc = lustre_msg_get_opc(req->rq_reqmsg);
1227
1228                 /*
1229                  * pings or MDS-equivalent STATFS may safely
1230                  * race with umount
1231                  */
1232                 DEBUG_REQ((opc == OBD_PING || opc == OST_STATFS) ?
1233                           D_HA : D_ERROR, req, "IMP_CLOSED");
1234                 *status = -EIO;
1235         } else if (ptlrpc_send_limit_expired(req)) {
1236                 /* probably doesn't need to be a D_ERROR afterinitial testing */
1237                 DEBUG_REQ(D_HA, req, "send limit expired");
1238                 *status = -ETIMEDOUT;
1239         } else if (req->rq_send_state == LUSTRE_IMP_CONNECTING &&
1240                    imp->imp_state == LUSTRE_IMP_CONNECTING) {
1241                 ;/* allow CONNECT even if import is invalid */
1242                 if (atomic_read(&imp->imp_inval_count) != 0) {
1243                         DEBUG_REQ(D_ERROR, req, "invalidate in flight");
1244                         *status = -EIO;
1245                 }
1246         } else if (imp->imp_invalid || imp->imp_obd->obd_no_recov) {
1247                 if (!imp->imp_deactive)
1248                         DEBUG_REQ(D_NET, req, "IMP_INVALID");
1249                 *status = -ESHUTDOWN; /* b=12940 */
1250         } else if (req->rq_import_generation != imp->imp_generation) {
1251                 DEBUG_REQ(D_ERROR, req, "req wrong generation:");
1252                 *status = -EIO;
1253         } else if (req->rq_send_state != imp->imp_state) {
1254                 /* invalidate in progress - any requests should be drop */
1255                 if (atomic_read(&imp->imp_inval_count) != 0) {
1256                         DEBUG_REQ(D_ERROR, req, "invalidate in flight");
1257                         *status = -EIO;
1258                 } else if (req->rq_no_delay &&
1259                            imp->imp_generation != imp->imp_initiated_at) {
1260                         /* ignore nodelay for requests initiating connections */
1261                         *status = -EWOULDBLOCK;
1262                 } else if (req->rq_allow_replay &&
1263                            (imp->imp_state == LUSTRE_IMP_REPLAY ||
1264                             imp->imp_state == LUSTRE_IMP_REPLAY_LOCKS ||
1265                             imp->imp_state == LUSTRE_IMP_REPLAY_WAIT ||
1266                             imp->imp_state == LUSTRE_IMP_RECOVER)) {
1267                         DEBUG_REQ(D_HA, req, "allow during recovery");
1268                 } else {
1269                         delay = 1;
1270                 }
1271         }
1272
1273         RETURN(delay);
1274 }
1275
1276 /**
1277  * Decide if the error message should be printed to the console or not.
1278  * Makes its decision based on request type, status, and failure frequency.
1279  *
1280  * \param[in] req  request that failed and may need a console message
1281  *
1282  * \retval false if no message should be printed
1283  * \retval true  if console message should be printed
1284  */
1285 static bool ptlrpc_console_allow(struct ptlrpc_request *req, __u32 opc, int err)
1286 {
1287         LASSERT(req->rq_reqmsg != NULL);
1288
1289         /* Suppress particular reconnect errors which are to be expected. */
1290         if (opc == OST_CONNECT || opc == MDS_CONNECT || opc == MGS_CONNECT) {
1291                 /* Suppress timed out reconnect requests */
1292                 if (lustre_handle_is_used(&req->rq_import->imp_remote_handle) ||
1293                     req->rq_timedout)
1294                         return false;
1295
1296                 /*
1297                  * Suppress most unavailable/again reconnect requests, but
1298                  * print occasionally so it is clear client is trying to
1299                  * connect to a server where no target is running.
1300                  */
1301                 if ((err == -ENODEV || err == -EAGAIN) &&
1302                     req->rq_import->imp_conn_cnt % 30 != 20)
1303                         return false;
1304         }
1305
1306         if (opc == LDLM_ENQUEUE && err == -EAGAIN)
1307                 /* -EAGAIN is normal when using POSIX flocks */
1308                 return false;
1309
1310         if (opc == OBD_PING && (err == -ENODEV || err == -ENOTCONN) &&
1311             (req->rq_xid & 0xf) != 10)
1312                 /* Suppress most ping requests, they may fail occasionally */
1313                 return false;
1314
1315         return true;
1316 }
1317
1318 /**
1319  * Check request processing status.
1320  * Returns the status.
1321  */
1322 static int ptlrpc_check_status(struct ptlrpc_request *req)
1323 {
1324         int rc;
1325
1326         ENTRY;
1327         rc = lustre_msg_get_status(req->rq_repmsg);
1328         if (lustre_msg_get_type(req->rq_repmsg) == PTL_RPC_MSG_ERR) {
1329                 struct obd_import *imp = req->rq_import;
1330                 lnet_nid_t nid = imp->imp_connection->c_peer.nid;
1331                 __u32 opc = lustre_msg_get_opc(req->rq_reqmsg);
1332
1333                 if (ptlrpc_console_allow(req, opc, rc))
1334                         LCONSOLE_ERROR_MSG(0x11,
1335                                            "%s: operation %s to node %s failed: rc = %d\n",
1336                                            imp->imp_obd->obd_name,
1337                                            ll_opcode2str(opc),
1338                                            libcfs_nid2str(nid), rc);
1339                 RETURN(rc < 0 ? rc : -EINVAL);
1340         }
1341
1342         if (rc)
1343                 DEBUG_REQ(D_INFO, req, "check status: rc = %d", rc);
1344
1345         RETURN(rc);
1346 }
1347
1348 /**
1349  * save pre-versions of objects into request for replay.
1350  * Versions are obtained from server reply.
1351  * used for VBR.
1352  */
1353 static void ptlrpc_save_versions(struct ptlrpc_request *req)
1354 {
1355         struct lustre_msg *repmsg = req->rq_repmsg;
1356         struct lustre_msg *reqmsg = req->rq_reqmsg;
1357         __u64 *versions = lustre_msg_get_versions(repmsg);
1358
1359         ENTRY;
1360         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY)
1361                 return;
1362
1363         LASSERT(versions);
1364         lustre_msg_set_versions(reqmsg, versions);
1365         CDEBUG(D_INFO, "Client save versions [%#llx/%#llx]\n",
1366                versions[0], versions[1]);
1367
1368         EXIT;
1369 }
1370
1371 __u64 ptlrpc_known_replied_xid(struct obd_import *imp)
1372 {
1373         struct ptlrpc_request *req;
1374
1375         assert_spin_locked(&imp->imp_lock);
1376         if (list_empty(&imp->imp_unreplied_list))
1377                 return 0;
1378
1379         req = list_entry(imp->imp_unreplied_list.next, struct ptlrpc_request,
1380                          rq_unreplied_list);
1381         LASSERTF(req->rq_xid >= 1, "XID:%llu\n", req->rq_xid);
1382
1383         if (imp->imp_known_replied_xid < req->rq_xid - 1)
1384                 imp->imp_known_replied_xid = req->rq_xid - 1;
1385
1386         return req->rq_xid - 1;
1387 }
1388
1389 /**
1390  * Callback function called when client receives RPC reply for \a req.
1391  * Returns 0 on success or error code.
1392  * The return alue would be assigned to req->rq_status by the caller
1393  * as request processing status.
1394  * This function also decides if the request needs to be saved for later replay.
1395  */
1396 static int after_reply(struct ptlrpc_request *req)
1397 {
1398         struct obd_import *imp = req->rq_import;
1399         struct obd_device *obd = req->rq_import->imp_obd;
1400         ktime_t work_start;
1401         u64 committed;
1402         s64 timediff;
1403         int rc;
1404
1405         ENTRY;
1406         LASSERT(obd != NULL);
1407         /* repbuf must be unlinked */
1408         LASSERT(!req->rq_receiving_reply && req->rq_reply_unlinked);
1409
1410         if (req->rq_reply_truncated) {
1411                 if (ptlrpc_no_resend(req)) {
1412                         DEBUG_REQ(D_ERROR, req,
1413                                   "reply buffer overflow, expected=%d, actual size=%d",
1414                                   req->rq_nob_received, req->rq_repbuf_len);
1415                         RETURN(-EOVERFLOW);
1416                 }
1417
1418                 sptlrpc_cli_free_repbuf(req);
1419                 /*
1420                  * Pass the required reply buffer size (include
1421                  * space for early reply).
1422                  * NB: no need to roundup because alloc_repbuf
1423                  * will roundup it
1424                  */
1425                 req->rq_replen = req->rq_nob_received;
1426                 req->rq_nob_received = 0;
1427                 spin_lock(&req->rq_lock);
1428                 req->rq_resend       = 1;
1429                 spin_unlock(&req->rq_lock);
1430                 RETURN(0);
1431         }
1432
1433         work_start = ktime_get_real();
1434         timediff = ktime_us_delta(work_start, req->rq_sent_ns);
1435
1436         /*
1437          * NB Until this point, the whole of the incoming message,
1438          * including buflens, status etc is in the sender's byte order.
1439          */
1440         rc = sptlrpc_cli_unwrap_reply(req);
1441         if (rc) {
1442                 DEBUG_REQ(D_ERROR, req, "unwrap reply failed: rc = %d", rc);
1443                 RETURN(rc);
1444         }
1445
1446         /*
1447          * Security layer unwrap might ask resend this request.
1448          */
1449         if (req->rq_resend)
1450                 RETURN(0);
1451
1452         rc = unpack_reply(req);
1453         if (rc)
1454                 RETURN(rc);
1455
1456         /* retry indefinitely on EINPROGRESS */
1457         if (lustre_msg_get_status(req->rq_repmsg) == -EINPROGRESS &&
1458             ptlrpc_no_resend(req) == 0 && !req->rq_no_retry_einprogress) {
1459                 time64_t now = ktime_get_real_seconds();
1460
1461                 DEBUG_REQ((req->rq_nr_resend % 8 == 1 ? D_WARNING : 0) |
1462                           D_RPCTRACE, req, "resending request on EINPROGRESS");
1463                 spin_lock(&req->rq_lock);
1464                 req->rq_resend = 1;
1465                 spin_unlock(&req->rq_lock);
1466                 req->rq_nr_resend++;
1467
1468                 /* Readjust the timeout for current conditions */
1469                 ptlrpc_at_set_req_timeout(req);
1470                 /*
1471                  * delay resend to give a chance to the server to get ready.
1472                  * The delay is increased by 1s on every resend and is capped to
1473                  * the current request timeout (i.e. obd_timeout if AT is off,
1474                  * or AT service time x 125% + 5s, see at_est2timeout)
1475                  */
1476                 if (req->rq_nr_resend > req->rq_timeout)
1477                         req->rq_sent = now + req->rq_timeout;
1478                 else
1479                         req->rq_sent = now + req->rq_nr_resend;
1480
1481                 /* Resend for EINPROGRESS will use a new XID */
1482                 spin_lock(&imp->imp_lock);
1483                 list_del_init(&req->rq_unreplied_list);
1484                 spin_unlock(&imp->imp_lock);
1485
1486                 RETURN(0);
1487         }
1488
1489         if (obd->obd_svc_stats) {
1490                 lprocfs_counter_add(obd->obd_svc_stats, PTLRPC_REQWAIT_CNTR,
1491                                     timediff);
1492                 ptlrpc_lprocfs_rpc_sent(req, timediff);
1493         }
1494
1495         if (lustre_msg_get_type(req->rq_repmsg) != PTL_RPC_MSG_REPLY &&
1496             lustre_msg_get_type(req->rq_repmsg) != PTL_RPC_MSG_ERR) {
1497                 DEBUG_REQ(D_ERROR, req, "invalid packet received (type=%u)",
1498                           lustre_msg_get_type(req->rq_repmsg));
1499                 RETURN(-EPROTO);
1500         }
1501
1502         if (lustre_msg_get_opc(req->rq_reqmsg) != OBD_PING)
1503                 CFS_FAIL_TIMEOUT(OBD_FAIL_PTLRPC_PAUSE_REP, cfs_fail_val);
1504         ptlrpc_at_adj_service(req, lustre_msg_get_timeout(req->rq_repmsg));
1505         ptlrpc_at_adj_net_latency(req,
1506                                   lustre_msg_get_service_time(req->rq_repmsg));
1507
1508         rc = ptlrpc_check_status(req);
1509
1510         if (rc) {
1511                 /*
1512                  * Either we've been evicted, or the server has failed for
1513                  * some reason. Try to reconnect, and if that fails, punt to
1514                  * the upcall.
1515                  */
1516                 if (ptlrpc_recoverable_error(rc)) {
1517                         if (req->rq_send_state != LUSTRE_IMP_FULL ||
1518                             imp->imp_obd->obd_no_recov || imp->imp_dlm_fake) {
1519                                 RETURN(rc);
1520                         }
1521                         ptlrpc_request_handle_notconn(req);
1522                         RETURN(rc);
1523                 }
1524         } else {
1525                 /*
1526                  * Let's look if server sent slv. Do it only for RPC with
1527                  * rc == 0.
1528                  */
1529                 ldlm_cli_update_pool(req);
1530         }
1531
1532         /*
1533          * Store transno in reqmsg for replay.
1534          */
1535         if (!(lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY)) {
1536                 req->rq_transno = lustre_msg_get_transno(req->rq_repmsg);
1537                 lustre_msg_set_transno(req->rq_reqmsg, req->rq_transno);
1538         }
1539
1540         if (imp->imp_replayable) {
1541                 spin_lock(&imp->imp_lock);
1542                 /*
1543                  * No point in adding already-committed requests to the replay
1544                  * list, we will just remove them immediately. b=9829
1545                  */
1546                 if (req->rq_transno != 0 &&
1547                     (req->rq_transno >
1548                      lustre_msg_get_last_committed(req->rq_repmsg) ||
1549                      req->rq_replay)) {
1550                         /** version recovery */
1551                         ptlrpc_save_versions(req);
1552                         ptlrpc_retain_replayable_request(req, imp);
1553                 } else if (req->rq_commit_cb &&
1554                            list_empty(&req->rq_replay_list)) {
1555                         /*
1556                          * NB: don't call rq_commit_cb if it's already on
1557                          * rq_replay_list, ptlrpc_free_committed() will call
1558                          * it later, see LU-3618 for details
1559                          */
1560                         spin_unlock(&imp->imp_lock);
1561                         req->rq_commit_cb(req);
1562                         spin_lock(&imp->imp_lock);
1563                 }
1564
1565                 /*
1566                  * Replay-enabled imports return commit-status information.
1567                  */
1568                 committed = lustre_msg_get_last_committed(req->rq_repmsg);
1569                 if (likely(committed > imp->imp_peer_committed_transno))
1570                         imp->imp_peer_committed_transno = committed;
1571
1572                 ptlrpc_free_committed(imp);
1573
1574                 if (!list_empty(&imp->imp_replay_list)) {
1575                         struct ptlrpc_request *last;
1576
1577                         last = list_entry(imp->imp_replay_list.prev,
1578                                           struct ptlrpc_request,
1579                                           rq_replay_list);
1580                         /*
1581                          * Requests with rq_replay stay on the list even if no
1582                          * commit is expected.
1583                          */
1584                         if (last->rq_transno > imp->imp_peer_committed_transno)
1585                                 ptlrpc_pinger_commit_expected(imp);
1586                 }
1587
1588                 spin_unlock(&imp->imp_lock);
1589         }
1590
1591         RETURN(rc);
1592 }
1593
1594 /**
1595  * Helper function to send request \a req over the network for the first time
1596  * Also adjusts request phase.
1597  * Returns 0 on success or error code.
1598  */
1599 static int ptlrpc_send_new_req(struct ptlrpc_request *req)
1600 {
1601         struct obd_import *imp = req->rq_import;
1602         __u64 min_xid = 0;
1603         int rc;
1604
1605         ENTRY;
1606         LASSERT(req->rq_phase == RQ_PHASE_NEW);
1607
1608         /* do not try to go further if there is not enough memory in enc_pool */
1609         if (req->rq_sent && req->rq_bulk)
1610                 if (req->rq_bulk->bd_iov_count > get_free_pages_in_pool() &&
1611                     pool_is_at_full_capacity())
1612                         RETURN(-ENOMEM);
1613
1614         if (req->rq_sent && (req->rq_sent > ktime_get_real_seconds()) &&
1615             (!req->rq_generation_set ||
1616              req->rq_import_generation == imp->imp_generation))
1617                 RETURN(0);
1618
1619         ptlrpc_rqphase_move(req, RQ_PHASE_RPC);
1620
1621         spin_lock(&imp->imp_lock);
1622
1623         LASSERT(req->rq_xid != 0);
1624         LASSERT(!list_empty(&req->rq_unreplied_list));
1625
1626         if (!req->rq_generation_set)
1627                 req->rq_import_generation = imp->imp_generation;
1628
1629         if (ptlrpc_import_delay_req(imp, req, &rc)) {
1630                 spin_lock(&req->rq_lock);
1631                 req->rq_waiting = 1;
1632                 spin_unlock(&req->rq_lock);
1633
1634                 DEBUG_REQ(D_HA, req, "req waiting for recovery: (%s != %s)",
1635                           ptlrpc_import_state_name(req->rq_send_state),
1636                           ptlrpc_import_state_name(imp->imp_state));
1637                 LASSERT(list_empty(&req->rq_list));
1638                 list_add_tail(&req->rq_list, &imp->imp_delayed_list);
1639                 atomic_inc(&req->rq_import->imp_inflight);
1640                 spin_unlock(&imp->imp_lock);
1641                 RETURN(0);
1642         }
1643
1644         if (rc != 0) {
1645                 spin_unlock(&imp->imp_lock);
1646                 req->rq_status = rc;
1647                 ptlrpc_rqphase_move(req, RQ_PHASE_INTERPRET);
1648                 RETURN(rc);
1649         }
1650
1651         LASSERT(list_empty(&req->rq_list));
1652         list_add_tail(&req->rq_list, &imp->imp_sending_list);
1653         atomic_inc(&req->rq_import->imp_inflight);
1654
1655         /*
1656          * find the known replied XID from the unreplied list, CONNECT
1657          * and DISCONNECT requests are skipped to make the sanity check
1658          * on server side happy. see process_req_last_xid().
1659          *
1660          * For CONNECT: Because replay requests have lower XID, it'll
1661          * break the sanity check if CONNECT bump the exp_last_xid on
1662          * server.
1663          *
1664          * For DISCONNECT: Since client will abort inflight RPC before
1665          * sending DISCONNECT, DISCONNECT may carry an XID which higher
1666          * than the inflight RPC.
1667          */
1668         if (!ptlrpc_req_is_connect(req) && !ptlrpc_req_is_disconnect(req))
1669                 min_xid = ptlrpc_known_replied_xid(imp);
1670         spin_unlock(&imp->imp_lock);
1671
1672         lustre_msg_set_last_xid(req->rq_reqmsg, min_xid);
1673
1674         lustre_msg_set_status(req->rq_reqmsg, current_pid());
1675
1676         rc = sptlrpc_req_refresh_ctx(req, -1);
1677         if (rc) {
1678                 if (req->rq_err) {
1679                         req->rq_status = rc;
1680                         RETURN(1);
1681                 } else {
1682                         spin_lock(&req->rq_lock);
1683                         req->rq_wait_ctx = 1;
1684                         spin_unlock(&req->rq_lock);
1685                         RETURN(0);
1686                 }
1687         }
1688
1689         CDEBUG(D_RPCTRACE,
1690                "Sending RPC req@%p pname:cluuid:pid:xid:nid:opc:job %s:%s:%d:%llu:%s:%d:%s\n",
1691                req, current_comm(),
1692                imp->imp_obd->obd_uuid.uuid,
1693                lustre_msg_get_status(req->rq_reqmsg), req->rq_xid,
1694                obd_import_nid2str(imp), lustre_msg_get_opc(req->rq_reqmsg),
1695                lustre_msg_get_jobid(req->rq_reqmsg) ?: "");
1696
1697         rc = ptl_send_rpc(req, 0);
1698         if (rc == -ENOMEM) {
1699                 spin_lock(&imp->imp_lock);
1700                 if (!list_empty(&req->rq_list)) {
1701                         list_del_init(&req->rq_list);
1702                         if (atomic_dec_and_test(&req->rq_import->imp_inflight))
1703                                 wake_up(&req->rq_import->imp_recovery_waitq);
1704                 }
1705                 spin_unlock(&imp->imp_lock);
1706                 ptlrpc_rqphase_move(req, RQ_PHASE_NEW);
1707                 RETURN(rc);
1708         }
1709         if (rc) {
1710                 DEBUG_REQ(D_HA, req, "send failed, expect timeout: rc = %d",
1711                           rc);
1712                 spin_lock(&req->rq_lock);
1713                 req->rq_net_err = 1;
1714                 spin_unlock(&req->rq_lock);
1715                 RETURN(rc);
1716         }
1717         RETURN(0);
1718 }
1719
1720 static inline int ptlrpc_set_producer(struct ptlrpc_request_set *set)
1721 {
1722         int remaining, rc;
1723
1724         ENTRY;
1725         LASSERT(set->set_producer != NULL);
1726
1727         remaining = atomic_read(&set->set_remaining);
1728
1729         /*
1730          * populate the ->set_requests list with requests until we
1731          * reach the maximum number of RPCs in flight for this set
1732          */
1733         while (atomic_read(&set->set_remaining) < set->set_max_inflight) {
1734                 rc = set->set_producer(set, set->set_producer_arg);
1735                 if (rc == -ENOENT) {
1736                         /* no more RPC to produce */
1737                         set->set_producer     = NULL;
1738                         set->set_producer_arg = NULL;
1739                         RETURN(0);
1740                 }
1741         }
1742
1743         RETURN((atomic_read(&set->set_remaining) - remaining));
1744 }
1745
1746 /**
1747  * this sends any unsent RPCs in \a set and returns 1 if all are sent
1748  * and no more replies are expected.
1749  * (it is possible to get less replies than requests sent e.g. due to timed out
1750  * requests or requests that we had trouble to send out)
1751  *
1752  * NOTE: This function contains a potential schedule point (cond_resched()).
1753  */
1754 int ptlrpc_check_set(const struct lu_env *env, struct ptlrpc_request_set *set)
1755 {
1756         struct list_head *tmp, *next;
1757         LIST_HEAD(comp_reqs);
1758         int force_timer_recalc = 0;
1759
1760         ENTRY;
1761         if (atomic_read(&set->set_remaining) == 0)
1762                 RETURN(1);
1763
1764         list_for_each_safe(tmp, next, &set->set_requests) {
1765                 struct ptlrpc_request *req =
1766                         list_entry(tmp, struct ptlrpc_request,
1767                                    rq_set_chain);
1768                 struct obd_import *imp = req->rq_import;
1769                 int unregistered = 0;
1770                 int async = 1;
1771                 int rc = 0;
1772
1773                 if (req->rq_phase == RQ_PHASE_COMPLETE) {
1774                         list_move_tail(&req->rq_set_chain, &comp_reqs);
1775                         continue;
1776                 }
1777
1778                 /*
1779                  * This schedule point is mainly for the ptlrpcd caller of this
1780                  * function.  Most ptlrpc sets are not long-lived and unbounded
1781                  * in length, but at the least the set used by the ptlrpcd is.
1782                  * Since the processing time is unbounded, we need to insert an
1783                  * explicit schedule point to make the thread well-behaved.
1784                  */
1785                 cond_resched();
1786
1787                 /*
1788                  * If the caller requires to allow to be interpreted by force
1789                  * and it has really been interpreted, then move the request
1790                  * to RQ_PHASE_INTERPRET phase in spite of what the current
1791                  * phase is.
1792                  */
1793                 if (unlikely(req->rq_allow_intr && req->rq_intr)) {
1794                         req->rq_status = -EINTR;
1795                         ptlrpc_rqphase_move(req, RQ_PHASE_INTERPRET);
1796
1797                         /*
1798                          * Since it is interpreted and we have to wait for
1799                          * the reply to be unlinked, then use sync mode.
1800                          */
1801                         async = 0;
1802
1803                         GOTO(interpret, req->rq_status);
1804                 }
1805
1806                 if (req->rq_phase == RQ_PHASE_NEW && ptlrpc_send_new_req(req))
1807                         force_timer_recalc = 1;
1808
1809                 /* delayed send - skip */
1810                 if (req->rq_phase == RQ_PHASE_NEW && req->rq_sent)
1811                         continue;
1812
1813                 /* delayed resend - skip */
1814                 if (req->rq_phase == RQ_PHASE_RPC && req->rq_resend &&
1815                     req->rq_sent > ktime_get_real_seconds())
1816                         continue;
1817
1818                 if (!(req->rq_phase == RQ_PHASE_RPC ||
1819                       req->rq_phase == RQ_PHASE_BULK ||
1820                       req->rq_phase == RQ_PHASE_INTERPRET ||
1821                       req->rq_phase == RQ_PHASE_UNREG_RPC ||
1822                       req->rq_phase == RQ_PHASE_UNREG_BULK)) {
1823                         DEBUG_REQ(D_ERROR, req, "bad phase %x", req->rq_phase);
1824                         LBUG();
1825                 }
1826
1827                 if (req->rq_phase == RQ_PHASE_UNREG_RPC ||
1828                     req->rq_phase == RQ_PHASE_UNREG_BULK) {
1829                         LASSERT(req->rq_next_phase != req->rq_phase);
1830                         LASSERT(req->rq_next_phase != RQ_PHASE_UNDEFINED);
1831
1832                         if (req->rq_req_deadline &&
1833                             !OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_REQ_UNLINK))
1834                                 req->rq_req_deadline = 0;
1835                         if (req->rq_reply_deadline &&
1836                             !OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_REPL_UNLINK))
1837                                 req->rq_reply_deadline = 0;
1838                         if (req->rq_bulk_deadline &&
1839                             !OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_BULK_UNLINK))
1840                                 req->rq_bulk_deadline = 0;
1841
1842                         /*
1843                          * Skip processing until reply is unlinked. We
1844                          * can't return to pool before that and we can't
1845                          * call interpret before that. We need to make
1846                          * sure that all rdma transfers finished and will
1847                          * not corrupt any data.
1848                          */
1849                         if (req->rq_phase == RQ_PHASE_UNREG_RPC &&
1850                             ptlrpc_client_recv_or_unlink(req))
1851                                 continue;
1852                         if (req->rq_phase == RQ_PHASE_UNREG_BULK &&
1853                             ptlrpc_client_bulk_active(req))
1854                                 continue;
1855
1856                         /*
1857                          * Turn fail_loc off to prevent it from looping
1858                          * forever.
1859                          */
1860                         if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_REPL_UNLINK)) {
1861                                 OBD_FAIL_CHECK_ORSET(OBD_FAIL_PTLRPC_LONG_REPL_UNLINK,
1862                                                      OBD_FAIL_ONCE);
1863                         }
1864                         if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_BULK_UNLINK)) {
1865                                 OBD_FAIL_CHECK_ORSET(OBD_FAIL_PTLRPC_LONG_BULK_UNLINK,
1866                                                      OBD_FAIL_ONCE);
1867                         }
1868
1869                         /*
1870                          * Move to next phase if reply was successfully
1871                          * unlinked.
1872                          */
1873                         ptlrpc_rqphase_move(req, req->rq_next_phase);
1874                 }
1875
1876                 if (req->rq_phase == RQ_PHASE_INTERPRET)
1877                         GOTO(interpret, req->rq_status);
1878
1879                 /*
1880                  * Note that this also will start async reply unlink.
1881                  */
1882                 if (req->rq_net_err && !req->rq_timedout) {
1883                         ptlrpc_expire_one_request(req, 1);
1884
1885                         /*
1886                          * Check if we still need to wait for unlink.
1887                          */
1888                         if (ptlrpc_client_recv_or_unlink(req) ||
1889                             ptlrpc_client_bulk_active(req))
1890                                 continue;
1891                         /* If there is no need to resend, fail it now. */
1892                         if (req->rq_no_resend) {
1893                                 if (req->rq_status == 0)
1894                                         req->rq_status = -EIO;
1895                                 ptlrpc_rqphase_move(req, RQ_PHASE_INTERPRET);
1896                                 GOTO(interpret, req->rq_status);
1897                         } else {
1898                                 continue;
1899                         }
1900                 }
1901
1902                 if (req->rq_err) {
1903                         spin_lock(&req->rq_lock);
1904                         req->rq_replied = 0;
1905                         spin_unlock(&req->rq_lock);
1906                         if (req->rq_status == 0)
1907                                 req->rq_status = -EIO;
1908                         ptlrpc_rqphase_move(req, RQ_PHASE_INTERPRET);
1909                         GOTO(interpret, req->rq_status);
1910                 }
1911
1912                 /*
1913                  * ptlrpc_set_wait->l_wait_event sets lwi_allow_intr
1914                  * so it sets rq_intr regardless of individual rpc
1915                  * timeouts. The synchronous IO waiting path sets
1916                  * rq_intr irrespective of whether ptlrpcd
1917                  * has seen a timeout.  Our policy is to only interpret
1918                  * interrupted rpcs after they have timed out, so we
1919                  * need to enforce that here.
1920                  */
1921
1922                 if (req->rq_intr && (req->rq_timedout || req->rq_waiting ||
1923                                      req->rq_wait_ctx)) {
1924                         req->rq_status = -EINTR;
1925                         ptlrpc_rqphase_move(req, RQ_PHASE_INTERPRET);
1926                         GOTO(interpret, req->rq_status);
1927                 }
1928
1929                 if (req->rq_phase == RQ_PHASE_RPC) {
1930                         if (req->rq_timedout || req->rq_resend ||
1931                             req->rq_waiting || req->rq_wait_ctx) {
1932                                 int status;
1933
1934                                 if (!ptlrpc_unregister_reply(req, 1)) {
1935                                         ptlrpc_unregister_bulk(req, 1);
1936                                         continue;
1937                                 }
1938
1939                                 spin_lock(&imp->imp_lock);
1940                                 if (ptlrpc_import_delay_req(imp, req,
1941                                                             &status)) {
1942                                         /*
1943                                          * put on delay list - only if we wait
1944                                          * recovery finished - before send
1945                                          */
1946                                         list_move_tail(&req->rq_list,
1947                                                        &imp->imp_delayed_list);
1948                                         spin_unlock(&imp->imp_lock);
1949                                         continue;
1950                                 }
1951
1952                                 if (status != 0)  {
1953                                         req->rq_status = status;
1954                                         ptlrpc_rqphase_move(req,
1955                                                             RQ_PHASE_INTERPRET);
1956                                         spin_unlock(&imp->imp_lock);
1957                                         GOTO(interpret, req->rq_status);
1958                                 }
1959                                 /* ignore on just initiated connections */
1960                                 if (ptlrpc_no_resend(req) &&
1961                                     !req->rq_wait_ctx &&
1962                                     imp->imp_generation !=
1963                                     imp->imp_initiated_at) {
1964                                         req->rq_status = -ENOTCONN;
1965                                         ptlrpc_rqphase_move(req,
1966                                                             RQ_PHASE_INTERPRET);
1967                                         spin_unlock(&imp->imp_lock);
1968                                         GOTO(interpret, req->rq_status);
1969                                 }
1970
1971                                 list_move_tail(&req->rq_list,
1972                                                &imp->imp_sending_list);
1973
1974                                 spin_unlock(&imp->imp_lock);
1975
1976                                 spin_lock(&req->rq_lock);
1977                                 req->rq_waiting = 0;
1978                                 spin_unlock(&req->rq_lock);
1979
1980                                 if (req->rq_timedout || req->rq_resend) {
1981                                         /*
1982                                          * This is re-sending anyways,
1983                                          * let's mark req as resend.
1984                                          */
1985                                         spin_lock(&req->rq_lock);
1986                                         req->rq_resend = 1;
1987                                         spin_unlock(&req->rq_lock);
1988                                 }
1989                                 /*
1990                                  * rq_wait_ctx is only touched by ptlrpcd,
1991                                  * so no lock is needed here.
1992                                  */
1993                                 status = sptlrpc_req_refresh_ctx(req, -1);
1994                                 if (status) {
1995                                         if (req->rq_err) {
1996                                                 req->rq_status = status;
1997                                                 spin_lock(&req->rq_lock);
1998                                                 req->rq_wait_ctx = 0;
1999                                                 spin_unlock(&req->rq_lock);
2000                                                 force_timer_recalc = 1;
2001                                         } else {
2002                                                 spin_lock(&req->rq_lock);
2003                                                 req->rq_wait_ctx = 1;
2004                                                 spin_unlock(&req->rq_lock);
2005                                         }
2006
2007                                         continue;
2008                                 } else {
2009                                         spin_lock(&req->rq_lock);
2010                                         req->rq_wait_ctx = 0;
2011                                         spin_unlock(&req->rq_lock);
2012                                 }
2013
2014                                 /*
2015                                  * In any case, the previous bulk should be
2016                                  * cleaned up to prepare for the new sending
2017                                  */
2018                                 if (req->rq_bulk &&
2019                                     !ptlrpc_unregister_bulk(req, 1))
2020                                         continue;
2021
2022                                 rc = ptl_send_rpc(req, 0);
2023                                 if (rc == -ENOMEM) {
2024                                         spin_lock(&imp->imp_lock);
2025                                         if (!list_empty(&req->rq_list))
2026                                                 list_del_init(&req->rq_list);
2027                                         spin_unlock(&imp->imp_lock);
2028                                         ptlrpc_rqphase_move(req, RQ_PHASE_NEW);
2029                                         continue;
2030                                 }
2031                                 if (rc) {
2032                                         DEBUG_REQ(D_HA, req,
2033                                                   "send failed: rc = %d", rc);
2034                                         force_timer_recalc = 1;
2035                                         spin_lock(&req->rq_lock);
2036                                         req->rq_net_err = 1;
2037                                         spin_unlock(&req->rq_lock);
2038                                         continue;
2039                                 }
2040                                 /* need to reset the timeout */
2041                                 force_timer_recalc = 1;
2042                         }
2043
2044                         spin_lock(&req->rq_lock);
2045
2046                         if (ptlrpc_client_early(req)) {
2047                                 ptlrpc_at_recv_early_reply(req);
2048                                 spin_unlock(&req->rq_lock);
2049                                 continue;
2050                         }
2051
2052                         /* Still waiting for a reply? */
2053                         if (ptlrpc_client_recv(req)) {
2054                                 spin_unlock(&req->rq_lock);
2055                                 continue;
2056                         }
2057
2058                         /* Did we actually receive a reply? */
2059                         if (!ptlrpc_client_replied(req)) {
2060                                 spin_unlock(&req->rq_lock);
2061                                 continue;
2062                         }
2063
2064                         spin_unlock(&req->rq_lock);
2065
2066                         /*
2067                          * unlink from net because we are going to
2068                          * swab in-place of reply buffer
2069                          */
2070                         unregistered = ptlrpc_unregister_reply(req, 1);
2071                         if (!unregistered)
2072                                 continue;
2073
2074                         req->rq_status = after_reply(req);
2075                         if (req->rq_resend)
2076                                 continue;
2077
2078                         /*
2079                          * If there is no bulk associated with this request,
2080                          * then we're done and should let the interpreter
2081                          * process the reply. Similarly if the RPC returned
2082                          * an error, and therefore the bulk will never arrive.
2083                          */
2084                         if (!req->rq_bulk || req->rq_status < 0) {
2085                                 ptlrpc_rqphase_move(req, RQ_PHASE_INTERPRET);
2086                                 GOTO(interpret, req->rq_status);
2087                         }
2088
2089                         ptlrpc_rqphase_move(req, RQ_PHASE_BULK);
2090                 }
2091
2092                 LASSERT(req->rq_phase == RQ_PHASE_BULK);
2093                 if (ptlrpc_client_bulk_active(req))
2094                         continue;
2095
2096                 if (req->rq_bulk->bd_failure) {
2097                         /*
2098                          * The RPC reply arrived OK, but the bulk screwed
2099                          * up!  Dead weird since the server told us the RPC
2100                          * was good after getting the REPLY for her GET or
2101                          * the ACK for her PUT.
2102                          */
2103                         DEBUG_REQ(D_ERROR, req, "bulk transfer failed");
2104                         req->rq_status = -EIO;
2105                 }
2106
2107                 ptlrpc_rqphase_move(req, RQ_PHASE_INTERPRET);
2108
2109 interpret:
2110                 LASSERT(req->rq_phase == RQ_PHASE_INTERPRET);
2111
2112                 /*
2113                  * This moves to "unregistering" phase we need to wait for
2114                  * reply unlink.
2115                  */
2116                 if (!unregistered && !ptlrpc_unregister_reply(req, async)) {
2117                         /* start async bulk unlink too */
2118                         ptlrpc_unregister_bulk(req, 1);
2119                         continue;
2120                 }
2121
2122                 if (!ptlrpc_unregister_bulk(req, async))
2123                         continue;
2124
2125                 /*
2126                  * When calling interpret receiving already should be
2127                  * finished.
2128                  */
2129                 LASSERT(!req->rq_receiving_reply);
2130
2131                 ptlrpc_req_interpret(env, req, req->rq_status);
2132
2133                 if (ptlrpcd_check_work(req)) {
2134                         atomic_dec(&set->set_remaining);
2135                         continue;
2136                 }
2137                 ptlrpc_rqphase_move(req, RQ_PHASE_COMPLETE);
2138
2139                 if (req->rq_reqmsg)
2140                         CDEBUG(D_RPCTRACE,
2141                                "Completed RPC req@%p pname:cluuid:pid:xid:nid:opc:job %s:%s:%d:%llu:%s:%d:%s\n",
2142                                req, current_comm(),
2143                                imp->imp_obd->obd_uuid.uuid,
2144                                lustre_msg_get_status(req->rq_reqmsg),
2145                                req->rq_xid,
2146                                obd_import_nid2str(imp),
2147                                lustre_msg_get_opc(req->rq_reqmsg),
2148                                lustre_msg_get_jobid(req->rq_reqmsg) ?: "");
2149
2150                 spin_lock(&imp->imp_lock);
2151                 /*
2152                  * Request already may be not on sending or delaying list. This
2153                  * may happen in the case of marking it erroneous for the case
2154                  * ptlrpc_import_delay_req(req, status) find it impossible to
2155                  * allow sending this rpc and returns *status != 0.
2156                  */
2157                 if (!list_empty(&req->rq_list)) {
2158                         list_del_init(&req->rq_list);
2159                         if (atomic_dec_and_test(&imp->imp_inflight))
2160                                 wake_up(&imp->imp_recovery_waitq);
2161                 }
2162                 list_del_init(&req->rq_unreplied_list);
2163                 spin_unlock(&imp->imp_lock);
2164
2165                 atomic_dec(&set->set_remaining);
2166                 wake_up(&imp->imp_recovery_waitq);
2167
2168                 if (set->set_producer) {
2169                         /* produce a new request if possible */
2170                         if (ptlrpc_set_producer(set) > 0)
2171                                 force_timer_recalc = 1;
2172
2173                         /*
2174                          * free the request that has just been completed
2175                          * in order not to pollute set->set_requests
2176                          */
2177                         list_del_init(&req->rq_set_chain);
2178                         spin_lock(&req->rq_lock);
2179                         req->rq_set = NULL;
2180                         req->rq_invalid_rqset = 0;
2181                         spin_unlock(&req->rq_lock);
2182
2183                         /* record rq_status to compute the final status later */
2184                         if (req->rq_status != 0)
2185                                 set->set_rc = req->rq_status;
2186                         ptlrpc_req_finished(req);
2187                 } else {
2188                         list_move_tail(&req->rq_set_chain, &comp_reqs);
2189                 }
2190         }
2191
2192         /*
2193          * move completed request at the head of list so it's easier for
2194          * caller to find them
2195          */
2196         list_splice(&comp_reqs, &set->set_requests);
2197
2198         /* If we hit an error, we want to recover promptly. */
2199         RETURN(atomic_read(&set->set_remaining) == 0 || force_timer_recalc);
2200 }
2201 EXPORT_SYMBOL(ptlrpc_check_set);
2202
2203 /**
2204  * Time out request \a req. is \a async_unlink is set, that means do not wait
2205  * until LNet actually confirms network buffer unlinking.
2206  * Return 1 if we should give up further retrying attempts or 0 otherwise.
2207  */
2208 int ptlrpc_expire_one_request(struct ptlrpc_request *req, int async_unlink)
2209 {
2210         struct obd_import *imp = req->rq_import;
2211         unsigned int debug_mask = D_RPCTRACE;
2212         int rc = 0;
2213
2214         ENTRY;
2215         spin_lock(&req->rq_lock);
2216         req->rq_timedout = 1;
2217         spin_unlock(&req->rq_lock);
2218
2219         if (ptlrpc_console_allow(req, lustre_msg_get_opc(req->rq_reqmsg),
2220                                  lustre_msg_get_status(req->rq_reqmsg)))
2221                 debug_mask = D_WARNING;
2222         DEBUG_REQ(debug_mask, req, "Request sent has %s: [sent %lld/real %lld]",
2223                   req->rq_net_err ? "failed due to network error" :
2224                      ((req->rq_real_sent == 0 ||
2225                        req->rq_real_sent < req->rq_sent ||
2226                        req->rq_real_sent >= req->rq_deadline) ?
2227                       "timed out for sent delay" : "timed out for slow reply"),
2228                   (s64)req->rq_sent, (s64)req->rq_real_sent);
2229
2230         if (imp && obd_debug_peer_on_timeout)
2231                 LNetDebugPeer(imp->imp_connection->c_peer);
2232
2233         ptlrpc_unregister_reply(req, async_unlink);
2234         ptlrpc_unregister_bulk(req, async_unlink);
2235
2236         if (obd_dump_on_timeout)
2237                 libcfs_debug_dumplog();
2238
2239         if (!imp) {
2240                 DEBUG_REQ(D_HA, req, "NULL import: already cleaned up?");
2241                 RETURN(1);
2242         }
2243
2244         atomic_inc(&imp->imp_timeouts);
2245
2246         /* The DLM server doesn't want recovery run on its imports. */
2247         if (imp->imp_dlm_fake)
2248                 RETURN(1);
2249
2250         /*
2251          * If this request is for recovery or other primordial tasks,
2252          * then error it out here.
2253          */
2254         if (req->rq_ctx_init || req->rq_ctx_fini ||
2255             req->rq_send_state != LUSTRE_IMP_FULL ||
2256             imp->imp_obd->obd_no_recov) {
2257                 DEBUG_REQ(D_RPCTRACE, req, "err -110, sent_state=%s (now=%s)",
2258                           ptlrpc_import_state_name(req->rq_send_state),
2259                           ptlrpc_import_state_name(imp->imp_state));
2260                 spin_lock(&req->rq_lock);
2261                 req->rq_status = -ETIMEDOUT;
2262                 req->rq_err = 1;
2263                 spin_unlock(&req->rq_lock);
2264                 RETURN(1);
2265         }
2266
2267         /*
2268          * if a request can't be resent we can't wait for an answer after
2269          * the timeout
2270          */
2271         if (ptlrpc_no_resend(req)) {
2272                 DEBUG_REQ(D_RPCTRACE, req, "TIMEOUT-NORESEND:");
2273                 rc = 1;
2274         }
2275
2276         ptlrpc_fail_import(imp, lustre_msg_get_conn_cnt(req->rq_reqmsg));
2277
2278         RETURN(rc);
2279 }
2280
2281 /**
2282  * Time out all uncompleted requests in request set pointed by \a data
2283  * Callback used when waiting on sets with l_wait_event.
2284  * Always returns 1.
2285  */
2286 void ptlrpc_expired_set(struct ptlrpc_request_set *set)
2287 {
2288         struct list_head *tmp;
2289         time64_t now = ktime_get_real_seconds();
2290
2291         ENTRY;
2292         LASSERT(set != NULL);
2293
2294         /*
2295          * A timeout expired. See which reqs it applies to...
2296          */
2297         list_for_each(tmp, &set->set_requests) {
2298                 struct ptlrpc_request *req =
2299                         list_entry(tmp, struct ptlrpc_request,
2300                                    rq_set_chain);
2301
2302                 /* don't expire request waiting for context */
2303                 if (req->rq_wait_ctx)
2304                         continue;
2305
2306                 /* Request in-flight? */
2307                 if (!((req->rq_phase == RQ_PHASE_RPC &&
2308                        !req->rq_waiting && !req->rq_resend) ||
2309                       (req->rq_phase == RQ_PHASE_BULK)))
2310                         continue;
2311
2312                 if (req->rq_timedout ||     /* already dealt with */
2313                     req->rq_deadline > now) /* not expired */
2314                         continue;
2315
2316                 /*
2317                  * Deal with this guy. Do it asynchronously to not block
2318                  * ptlrpcd thread.
2319                  */
2320                 ptlrpc_expire_one_request(req, 1);
2321         }
2322 }
2323
2324 /**
2325  * Interrupts (sets interrupted flag) all uncompleted requests in
2326  * a set \a data. Callback for l_wait_event for interruptible waits.
2327  */
2328 static void ptlrpc_interrupted_set(struct ptlrpc_request_set *set)
2329 {
2330         struct list_head *tmp;
2331
2332         LASSERT(set != NULL);
2333         CDEBUG(D_RPCTRACE, "INTERRUPTED SET %p\n", set);
2334
2335         list_for_each(tmp, &set->set_requests) {
2336                 struct ptlrpc_request *req =
2337                         list_entry(tmp, struct ptlrpc_request, rq_set_chain);
2338
2339                 if (req->rq_intr)
2340                         continue;
2341
2342                 if (req->rq_phase != RQ_PHASE_RPC &&
2343                     req->rq_phase != RQ_PHASE_UNREG_RPC &&
2344                     !req->rq_allow_intr)
2345                         continue;
2346
2347                 spin_lock(&req->rq_lock);
2348                 req->rq_intr = 1;
2349                 spin_unlock(&req->rq_lock);
2350         }
2351 }
2352
2353 /**
2354  * Get the smallest timeout in the set; this does NOT set a timeout.
2355  */
2356 time64_t ptlrpc_set_next_timeout(struct ptlrpc_request_set *set)
2357 {
2358         struct list_head *tmp;
2359         time64_t now = ktime_get_real_seconds();
2360         int timeout = 0;
2361         struct ptlrpc_request *req;
2362         time64_t deadline;
2363
2364         ENTRY;
2365         list_for_each(tmp, &set->set_requests) {
2366                 req = list_entry(tmp, struct ptlrpc_request, rq_set_chain);
2367
2368                 /* Request in-flight? */
2369                 if (!(((req->rq_phase == RQ_PHASE_RPC) && !req->rq_waiting) ||
2370                       (req->rq_phase == RQ_PHASE_BULK) ||
2371                       (req->rq_phase == RQ_PHASE_NEW)))
2372                         continue;
2373
2374                 /* Already timed out. */
2375                 if (req->rq_timedout)
2376                         continue;
2377
2378                 /* Waiting for ctx. */
2379                 if (req->rq_wait_ctx)
2380                         continue;
2381
2382                 if (req->rq_phase == RQ_PHASE_NEW)
2383                         deadline = req->rq_sent;
2384                 else if (req->rq_phase == RQ_PHASE_RPC && req->rq_resend)
2385                         deadline = req->rq_sent;
2386                 else
2387                         deadline = req->rq_sent + req->rq_timeout;
2388
2389                 if (deadline <= now)    /* actually expired already */
2390                         timeout = 1;    /* ASAP */
2391                 else if (timeout == 0 || timeout > deadline - now)
2392                         timeout = deadline - now;
2393         }
2394         RETURN(timeout);
2395 }
2396
2397 /**
2398  * Send all unset request from the set and then wait untill all
2399  * requests in the set complete (either get a reply, timeout, get an
2400  * error or otherwise be interrupted).
2401  * Returns 0 on success or error code otherwise.
2402  */
2403 int ptlrpc_set_wait(const struct lu_env *env, struct ptlrpc_request_set *set)
2404 {
2405         struct list_head *tmp;
2406         struct ptlrpc_request *req;
2407         time64_t timeout;
2408         int rc;
2409
2410         ENTRY;
2411         if (set->set_producer)
2412                 (void)ptlrpc_set_producer(set);
2413         else
2414                 list_for_each(tmp, &set->set_requests) {
2415                         req = list_entry(tmp, struct ptlrpc_request,
2416                                          rq_set_chain);
2417                         if (req->rq_phase == RQ_PHASE_NEW)
2418                                 (void)ptlrpc_send_new_req(req);
2419                 }
2420
2421         if (list_empty(&set->set_requests))
2422                 RETURN(0);
2423
2424         do {
2425                 timeout = ptlrpc_set_next_timeout(set);
2426
2427                 /*
2428                  * wait until all complete, interrupted, or an in-flight
2429                  * req times out
2430                  */
2431                 CDEBUG(D_RPCTRACE, "set %p going to sleep for %lld seconds\n",
2432                        set, timeout);
2433
2434                 if ((timeout == 0 && !signal_pending(current)) ||
2435                     set->set_allow_intr) {
2436                         /*
2437                          * No requests are in-flight (ether timed out
2438                          * or delayed), so we can allow interrupts.
2439                          * We still want to block for a limited time,
2440                          * so we allow interrupts during the timeout.
2441                          */
2442                         rc = l_wait_event_abortable_timeout(
2443                                 set->set_waitq,
2444                                 ptlrpc_check_set(NULL, set),
2445                                 cfs_time_seconds(timeout ? timeout : 1));
2446                         if (rc == 0) {
2447                                 rc = -ETIMEDOUT;
2448                                 ptlrpc_expired_set(set);
2449                         } else if (rc < 0) {
2450                                 rc = -EINTR;
2451                                 ptlrpc_interrupted_set(set);
2452                         } else {
2453                                 rc = 0;
2454                         }
2455                 } else {
2456                         /*
2457                          * At least one request is in flight, so no
2458                          * interrupts are allowed. Wait until all
2459                          * complete, or an in-flight req times out.
2460                          */
2461                         rc = wait_event_idle_timeout(
2462                                 set->set_waitq,
2463                                 ptlrpc_check_set(NULL, set),
2464                                 cfs_time_seconds(timeout ? timeout : 1));
2465                         if (rc == 0) {
2466                                 ptlrpc_expired_set(set);
2467                                 rc = -ETIMEDOUT;
2468                         } else {
2469                                 rc = 0;
2470                         }
2471
2472                         /*
2473                          * LU-769 - if we ignored the signal because
2474                          * it was already pending when we started, we
2475                          * need to handle it now or we risk it being
2476                          * ignored forever
2477                          */
2478                         if (rc == -ETIMEDOUT &&
2479                             signal_pending(current)) {
2480                                 sigset_t blocked_sigs =
2481                                         cfs_block_sigsinv(LUSTRE_FATAL_SIGS);
2482
2483                                 /*
2484                                  * In fact we only interrupt for the
2485                                  * "fatal" signals like SIGINT or
2486                                  * SIGKILL. We still ignore less
2487                                  * important signals since ptlrpc set
2488                                  * is not easily reentrant from
2489                                  * userspace again
2490                                  */
2491                                 if (signal_pending(current))
2492                                         ptlrpc_interrupted_set(set);
2493                                 cfs_restore_sigs(blocked_sigs);
2494                         }
2495                 }
2496
2497                 LASSERT(rc == 0 || rc == -EINTR || rc == -ETIMEDOUT);
2498
2499                 /*
2500                  * -EINTR => all requests have been flagged rq_intr so next
2501                  * check completes.
2502                  * -ETIMEDOUT => someone timed out.  When all reqs have
2503                  * timed out, signals are enabled allowing completion with
2504                  * EINTR.
2505                  * I don't really care if we go once more round the loop in
2506                  * the error cases -eeb.
2507                  */
2508                 if (rc == 0 && atomic_read(&set->set_remaining) == 0) {
2509                         list_for_each(tmp, &set->set_requests) {
2510                                 req = list_entry(tmp, struct ptlrpc_request,
2511                                                  rq_set_chain);
2512                                 spin_lock(&req->rq_lock);
2513                                 req->rq_invalid_rqset = 1;
2514                                 spin_unlock(&req->rq_lock);
2515                         }
2516                 }
2517         } while (rc != 0 || atomic_read(&set->set_remaining) != 0);
2518
2519         LASSERT(atomic_read(&set->set_remaining) == 0);
2520
2521         rc = set->set_rc; /* rq_status of already freed requests if any */
2522         list_for_each(tmp, &set->set_requests) {
2523                 req = list_entry(tmp, struct ptlrpc_request, rq_set_chain);
2524
2525                 LASSERT(req->rq_phase == RQ_PHASE_COMPLETE);
2526                 if (req->rq_status != 0)
2527                         rc = req->rq_status;
2528         }
2529
2530         RETURN(rc);
2531 }
2532 EXPORT_SYMBOL(ptlrpc_set_wait);
2533
2534 /**
2535  * Helper fuction for request freeing.
2536  * Called when request count reached zero and request needs to be freed.
2537  * Removes request from all sorts of sending/replay lists it might be on,
2538  * frees network buffers if any are present.
2539  * If \a locked is set, that means caller is already holding import imp_lock
2540  * and so we no longer need to reobtain it (for certain lists manipulations)
2541  */
2542 static void __ptlrpc_free_req(struct ptlrpc_request *request, int locked)
2543 {
2544         ENTRY;
2545
2546         if (!request)
2547                 RETURN_EXIT;
2548
2549         LASSERT(!request->rq_srv_req);
2550         LASSERT(request->rq_export == NULL);
2551         LASSERTF(!request->rq_receiving_reply, "req %p\n", request);
2552         LASSERTF(list_empty(&request->rq_list), "req %p\n", request);
2553         LASSERTF(list_empty(&request->rq_set_chain), "req %p\n", request);
2554         LASSERTF(!request->rq_replay, "req %p\n", request);
2555
2556         req_capsule_fini(&request->rq_pill);
2557
2558         /*
2559          * We must take it off the imp_replay_list first.  Otherwise, we'll set
2560          * request->rq_reqmsg to NULL while osc_close is dereferencing it.
2561          */
2562         if (request->rq_import) {
2563                 if (!locked)
2564                         spin_lock(&request->rq_import->imp_lock);
2565                 list_del_init(&request->rq_replay_list);
2566                 list_del_init(&request->rq_unreplied_list);
2567                 if (!locked)
2568                         spin_unlock(&request->rq_import->imp_lock);
2569         }
2570         LASSERTF(list_empty(&request->rq_replay_list), "req %p\n", request);
2571
2572         if (atomic_read(&request->rq_refcount) != 0) {
2573                 DEBUG_REQ(D_ERROR, request,
2574                           "freeing request with nonzero refcount");
2575                 LBUG();
2576         }
2577
2578         if (request->rq_repbuf)
2579                 sptlrpc_cli_free_repbuf(request);
2580
2581         if (request->rq_import) {
2582                 class_import_put(request->rq_import);
2583                 request->rq_import = NULL;
2584         }
2585         if (request->rq_bulk)
2586                 ptlrpc_free_bulk(request->rq_bulk);
2587
2588         if (request->rq_reqbuf || request->rq_clrbuf)
2589                 sptlrpc_cli_free_reqbuf(request);
2590
2591         if (request->rq_cli_ctx)
2592                 sptlrpc_req_put_ctx(request, !locked);
2593
2594         if (request->rq_pool)
2595                 __ptlrpc_free_req_to_pool(request);
2596         else
2597                 ptlrpc_request_cache_free(request);
2598         EXIT;
2599 }
2600
2601 static int __ptlrpc_req_finished(struct ptlrpc_request *request, int locked);
2602 /**
2603  * Drop one request reference. Must be called with import imp_lock held.
2604  * When reference count drops to zero, request is freed.
2605  */
2606 void ptlrpc_req_finished_with_imp_lock(struct ptlrpc_request *request)
2607 {
2608         assert_spin_locked(&request->rq_import->imp_lock);
2609         (void)__ptlrpc_req_finished(request, 1);
2610 }
2611
2612 /**
2613  * Helper function
2614  * Drops one reference count for request \a request.
2615  * \a locked set indicates that caller holds import imp_lock.
2616  * Frees the request whe reference count reaches zero.
2617  *
2618  * \retval 1    the request is freed
2619  * \retval 0    some others still hold references on the request
2620  */
2621 static int __ptlrpc_req_finished(struct ptlrpc_request *request, int locked)
2622 {
2623         int count;
2624
2625         ENTRY;
2626         if (!request)
2627                 RETURN(1);
2628
2629         LASSERT(request != LP_POISON);
2630         LASSERT(request->rq_reqmsg != LP_POISON);
2631
2632         DEBUG_REQ(D_INFO, request, "refcount now %u",
2633                   atomic_read(&request->rq_refcount) - 1);
2634
2635         spin_lock(&request->rq_lock);
2636         count = atomic_dec_return(&request->rq_refcount);
2637         LASSERTF(count >= 0, "Invalid ref count %d\n", count);
2638
2639         /*
2640          * For open RPC, the client does not know the EA size (LOV, ACL, and
2641          * so on) before replied, then the client has to reserve very large
2642          * reply buffer. Such buffer will not be released until the RPC freed.
2643          * Since The open RPC is replayable, we need to keep it in the replay
2644          * list until close. If there are a lot of files opened concurrently,
2645          * then the client may be OOM.
2646          *
2647          * If fact, it is unnecessary to keep reply buffer for open replay,
2648          * related EAs have already been saved via mdc_save_lovea() before
2649          * coming here. So it is safe to free the reply buffer some earlier
2650          * before releasing the RPC to avoid client OOM. LU-9514
2651          */
2652         if (count == 1 && request->rq_early_free_repbuf && request->rq_repbuf) {
2653                 spin_lock(&request->rq_early_free_lock);
2654                 sptlrpc_cli_free_repbuf(request);
2655                 request->rq_repbuf = NULL;
2656                 request->rq_repbuf_len = 0;
2657                 request->rq_repdata = NULL;
2658                 request->rq_reqdata_len = 0;
2659                 spin_unlock(&request->rq_early_free_lock);
2660         }
2661         spin_unlock(&request->rq_lock);
2662
2663         if (!count)
2664                 __ptlrpc_free_req(request, locked);
2665
2666         RETURN(!count);
2667 }
2668
2669 /**
2670  * Drops one reference count for a request.
2671  */
2672 void ptlrpc_req_finished(struct ptlrpc_request *request)
2673 {
2674         __ptlrpc_req_finished(request, 0);
2675 }
2676 EXPORT_SYMBOL(ptlrpc_req_finished);
2677
2678 /**
2679  * Returns xid of a \a request
2680  */
2681 __u64 ptlrpc_req_xid(struct ptlrpc_request *request)
2682 {
2683         return request->rq_xid;
2684 }
2685 EXPORT_SYMBOL(ptlrpc_req_xid);
2686
2687 /**
2688  * Disengage the client's reply buffer from the network
2689  * NB does _NOT_ unregister any client-side bulk.
2690  * IDEMPOTENT, but _not_ safe against concurrent callers.
2691  * The request owner (i.e. the thread doing the I/O) must call...
2692  * Returns 0 on success or 1 if unregistering cannot be made.
2693  */
2694 static int ptlrpc_unregister_reply(struct ptlrpc_request *request, int async)
2695 {
2696         /*
2697          * Might sleep.
2698          */
2699         LASSERT(!in_interrupt());
2700
2701         /* Let's setup deadline for reply unlink. */
2702         if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_REPL_UNLINK) &&
2703             async && request->rq_reply_deadline == 0 && cfs_fail_val == 0)
2704                 request->rq_reply_deadline = ktime_get_real_seconds() +
2705                                              LONG_UNLINK;
2706
2707         /*
2708          * Nothing left to do.
2709          */
2710         if (!ptlrpc_client_recv_or_unlink(request))
2711                 RETURN(1);
2712
2713         LNetMDUnlink(request->rq_reply_md_h);
2714
2715         /*
2716          * Let's check it once again.
2717          */
2718         if (!ptlrpc_client_recv_or_unlink(request))
2719                 RETURN(1);
2720
2721         /* Move to "Unregistering" phase as reply was not unlinked yet. */
2722         ptlrpc_rqphase_move(request, RQ_PHASE_UNREG_RPC);
2723
2724         /*
2725          * Do not wait for unlink to finish.
2726          */
2727         if (async)
2728                 RETURN(0);
2729
2730         /*
2731          * We have to wait_event_idle_timeout() whatever the result, to get
2732          * a chance to run reply_in_callback(), and to make sure we've
2733          * unlinked before returning a req to the pool.
2734          */
2735         for (;;) {
2736                 wait_queue_head_t *wq = (request->rq_set) ?
2737                                         &request->rq_set->set_waitq :
2738                                         &request->rq_reply_waitq;
2739                 int seconds = LONG_UNLINK;
2740                 /*
2741                  * Network access will complete in finite time but the HUGE
2742                  * timeout lets us CWARN for visibility of sluggish NALs
2743                  */
2744                 while (seconds > 0 &&
2745                        wait_event_idle_timeout(
2746                                *wq,
2747                                !ptlrpc_client_recv_or_unlink(request),
2748                                cfs_time_seconds(1)) == 0)
2749                         seconds -= 1;
2750                 if (seconds > 0) {
2751                         ptlrpc_rqphase_move(request, request->rq_next_phase);
2752                         RETURN(1);
2753                 }
2754
2755                 DEBUG_REQ(D_WARNING, request,
2756                           "Unexpectedly long timeout receiving_reply=%d req_ulinked=%d reply_unlinked=%d",
2757                           request->rq_receiving_reply,
2758                           request->rq_req_unlinked,
2759                           request->rq_reply_unlinked);
2760         }
2761         RETURN(0);
2762 }
2763
2764 static void ptlrpc_free_request(struct ptlrpc_request *req)
2765 {
2766         spin_lock(&req->rq_lock);
2767         req->rq_replay = 0;
2768         spin_unlock(&req->rq_lock);
2769
2770         if (req->rq_commit_cb)
2771                 req->rq_commit_cb(req);
2772         list_del_init(&req->rq_replay_list);
2773
2774         __ptlrpc_req_finished(req, 1);
2775 }
2776
2777 /**
2778  * the request is committed and dropped from the replay list of its import
2779  */
2780 void ptlrpc_request_committed(struct ptlrpc_request *req, int force)
2781 {
2782         struct obd_import *imp = req->rq_import;
2783
2784         spin_lock(&imp->imp_lock);
2785         if (list_empty(&req->rq_replay_list)) {
2786                 spin_unlock(&imp->imp_lock);
2787                 return;
2788         }
2789
2790         if (force || req->rq_transno <= imp->imp_peer_committed_transno) {
2791                 if (imp->imp_replay_cursor == &req->rq_replay_list)
2792                         imp->imp_replay_cursor = req->rq_replay_list.next;
2793                 ptlrpc_free_request(req);
2794         }
2795
2796         spin_unlock(&imp->imp_lock);
2797 }
2798 EXPORT_SYMBOL(ptlrpc_request_committed);
2799
2800 /**
2801  * Iterates through replay_list on import and prunes
2802  * all requests have transno smaller than last_committed for the
2803  * import and don't have rq_replay set.
2804  * Since requests are sorted in transno order, stops when meetign first
2805  * transno bigger than last_committed.
2806  * caller must hold imp->imp_lock
2807  */
2808 void ptlrpc_free_committed(struct obd_import *imp)
2809 {
2810         struct ptlrpc_request *req, *saved;
2811         struct ptlrpc_request *last_req = NULL; /* temporary fire escape */
2812         bool skip_committed_list = true;
2813
2814         ENTRY;
2815         LASSERT(imp != NULL);
2816         assert_spin_locked(&imp->imp_lock);
2817
2818         if (imp->imp_peer_committed_transno == imp->imp_last_transno_checked &&
2819             imp->imp_generation == imp->imp_last_generation_checked) {
2820                 CDEBUG(D_INFO, "%s: skip recheck: last_committed %llu\n",
2821                        imp->imp_obd->obd_name, imp->imp_peer_committed_transno);
2822                 RETURN_EXIT;
2823         }
2824         CDEBUG(D_RPCTRACE, "%s: committing for last_committed %llu gen %d\n",
2825                imp->imp_obd->obd_name, imp->imp_peer_committed_transno,
2826                imp->imp_generation);
2827
2828         if (imp->imp_generation != imp->imp_last_generation_checked ||
2829             imp->imp_last_transno_checked == 0)
2830                 skip_committed_list = false;
2831
2832         imp->imp_last_transno_checked = imp->imp_peer_committed_transno;
2833         imp->imp_last_generation_checked = imp->imp_generation;
2834
2835         list_for_each_entry_safe(req, saved, &imp->imp_replay_list,
2836                                  rq_replay_list) {
2837                 /* XXX ok to remove when 1357 resolved - rread 05/29/03  */
2838                 LASSERT(req != last_req);
2839                 last_req = req;
2840
2841                 if (req->rq_transno == 0) {
2842                         DEBUG_REQ(D_EMERG, req, "zero transno during replay");
2843                         LBUG();
2844                 }
2845                 if (req->rq_import_generation < imp->imp_generation) {
2846                         DEBUG_REQ(D_RPCTRACE, req, "free request with old gen");
2847                         GOTO(free_req, 0);
2848                 }
2849
2850                 /* not yet committed */
2851                 if (req->rq_transno > imp->imp_peer_committed_transno) {
2852                         DEBUG_REQ(D_RPCTRACE, req, "stopping search");
2853                         break;
2854                 }
2855
2856                 if (req->rq_replay) {
2857                         DEBUG_REQ(D_RPCTRACE, req, "keeping (FL_REPLAY)");
2858                         list_move_tail(&req->rq_replay_list,
2859                                        &imp->imp_committed_list);
2860                         continue;
2861                 }
2862
2863                 DEBUG_REQ(D_INFO, req, "commit (last_committed %llu)",
2864                           imp->imp_peer_committed_transno);
2865 free_req:
2866                 ptlrpc_free_request(req);
2867         }
2868
2869         if (skip_committed_list)
2870                 GOTO(out, 0);
2871
2872         list_for_each_entry_safe(req, saved, &imp->imp_committed_list,
2873                                  rq_replay_list) {
2874                 LASSERT(req->rq_transno != 0);
2875                 if (req->rq_import_generation < imp->imp_generation ||
2876                     !req->rq_replay) {
2877                         DEBUG_REQ(D_RPCTRACE, req, "free %s open request",
2878                                   req->rq_import_generation <
2879                                   imp->imp_generation ? "stale" : "closed");
2880
2881                         if (imp->imp_replay_cursor == &req->rq_replay_list)
2882                                 imp->imp_replay_cursor =
2883                                         req->rq_replay_list.next;
2884
2885                         ptlrpc_free_request(req);
2886                 }
2887         }
2888 out:
2889         EXIT;
2890 }
2891
2892 void ptlrpc_cleanup_client(struct obd_import *imp)
2893 {
2894         ENTRY;
2895         EXIT;
2896 }
2897
2898 /**
2899  * Schedule previously sent request for resend.
2900  * For bulk requests we assign new xid (to avoid problems with
2901  * lost replies and therefore several transfers landing into same buffer
2902  * from different sending attempts).
2903  */
2904 void ptlrpc_resend_req(struct ptlrpc_request *req)
2905 {
2906         DEBUG_REQ(D_HA, req, "going to resend");
2907         spin_lock(&req->rq_lock);
2908
2909         /*
2910          * Request got reply but linked to the import list still.
2911          * Let ptlrpc_check_set() process it.
2912          */
2913         if (ptlrpc_client_replied(req)) {
2914                 spin_unlock(&req->rq_lock);
2915                 DEBUG_REQ(D_HA, req, "it has reply, so skip it");
2916                 return;
2917         }
2918
2919         req->rq_status = -EAGAIN;
2920
2921         req->rq_resend = 1;
2922         req->rq_net_err = 0;
2923         req->rq_timedout = 0;
2924
2925         ptlrpc_client_wake_req(req);
2926         spin_unlock(&req->rq_lock);
2927 }
2928
2929 /* XXX: this function and rq_status are currently unused */
2930 void ptlrpc_restart_req(struct ptlrpc_request *req)
2931 {
2932         DEBUG_REQ(D_HA, req, "restarting (possibly-)completed request");
2933         req->rq_status = -ERESTARTSYS;
2934
2935         spin_lock(&req->rq_lock);
2936         req->rq_restart = 1;
2937         req->rq_timedout = 0;
2938         ptlrpc_client_wake_req(req);
2939         spin_unlock(&req->rq_lock);
2940 }
2941
2942 /**
2943  * Grab additional reference on a request \a req
2944  */
2945 struct ptlrpc_request *ptlrpc_request_addref(struct ptlrpc_request *req)
2946 {
2947         ENTRY;
2948         atomic_inc(&req->rq_refcount);
2949         RETURN(req);
2950 }
2951 EXPORT_SYMBOL(ptlrpc_request_addref);
2952
2953 /**
2954  * Add a request to import replay_list.
2955  * Must be called under imp_lock
2956  */
2957 void ptlrpc_retain_replayable_request(struct ptlrpc_request *req,
2958                                       struct obd_import *imp)
2959 {
2960         struct list_head *tmp;
2961
2962         assert_spin_locked(&imp->imp_lock);
2963
2964         if (req->rq_transno == 0) {
2965                 DEBUG_REQ(D_EMERG, req, "saving request with zero transno");
2966                 LBUG();
2967         }
2968
2969         /*
2970          * clear this for new requests that were resent as well
2971          * as resent replayed requests.
2972          */
2973         lustre_msg_clear_flags(req->rq_reqmsg, MSG_RESENT);
2974
2975         /* don't re-add requests that have been replayed */
2976         if (!list_empty(&req->rq_replay_list))
2977                 return;
2978
2979         lustre_msg_add_flags(req->rq_reqmsg, MSG_REPLAY);
2980
2981         spin_lock(&req->rq_lock);
2982         req->rq_resend = 0;
2983         spin_unlock(&req->rq_lock);
2984
2985         LASSERT(imp->imp_replayable);
2986         /* Balanced in ptlrpc_free_committed, usually. */
2987         ptlrpc_request_addref(req);
2988         list_for_each_prev(tmp, &imp->imp_replay_list) {
2989                 struct ptlrpc_request *iter = list_entry(tmp,
2990                                                          struct ptlrpc_request,
2991                                                          rq_replay_list);
2992
2993                 /*
2994                  * We may have duplicate transnos if we create and then
2995                  * open a file, or for closes retained if to match creating
2996                  * opens, so use req->rq_xid as a secondary key.
2997                  * (See bugs 684, 685, and 428.)
2998                  * XXX no longer needed, but all opens need transnos!
2999                  */
3000                 if (iter->rq_transno > req->rq_transno)
3001                         continue;
3002
3003                 if (iter->rq_transno == req->rq_transno) {
3004                         LASSERT(iter->rq_xid != req->rq_xid);
3005                         if (iter->rq_xid > req->rq_xid)
3006                                 continue;
3007                 }
3008
3009                 list_add(&req->rq_replay_list, &iter->rq_replay_list);
3010                 return;
3011         }
3012
3013         list_add(&req->rq_replay_list, &imp->imp_replay_list);
3014 }
3015
3016 /**
3017  * Send request and wait until it completes.
3018  * Returns request processing status.
3019  */
3020 int ptlrpc_queue_wait(struct ptlrpc_request *req)
3021 {
3022         struct ptlrpc_request_set *set;
3023         int rc;
3024
3025         ENTRY;
3026         LASSERT(req->rq_set == NULL);
3027         LASSERT(!req->rq_receiving_reply);
3028
3029         set = ptlrpc_prep_set();
3030         if (!set) {
3031                 CERROR("cannot allocate ptlrpc set: rc = %d\n", -ENOMEM);
3032                 RETURN(-ENOMEM);
3033         }
3034
3035         /* for distributed debugging */
3036         lustre_msg_set_status(req->rq_reqmsg, current_pid());
3037
3038         /* add a ref for the set (see comment in ptlrpc_set_add_req) */
3039         ptlrpc_request_addref(req);
3040         ptlrpc_set_add_req(set, req);
3041         rc = ptlrpc_set_wait(NULL, set);
3042         ptlrpc_set_destroy(set);
3043
3044         RETURN(rc);
3045 }
3046 EXPORT_SYMBOL(ptlrpc_queue_wait);
3047
3048 /**
3049  * Callback used for replayed requests reply processing.
3050  * In case of successful reply calls registered request replay callback.
3051  * In case of error restart replay process.
3052  */
3053 static int ptlrpc_replay_interpret(const struct lu_env *env,
3054                                    struct ptlrpc_request *req,
3055                                    void *args, int rc)
3056 {
3057         struct ptlrpc_replay_async_args *aa = args;
3058         struct obd_import *imp = req->rq_import;
3059
3060         ENTRY;
3061         atomic_dec(&imp->imp_replay_inflight);
3062
3063         /*
3064          * Note: if it is bulk replay (MDS-MDS replay), then even if
3065          * server got the request, but bulk transfer timeout, let's
3066          * replay the bulk req again
3067          */
3068         if (!ptlrpc_client_replied(req) ||
3069             (req->rq_bulk &&
3070              lustre_msg_get_status(req->rq_repmsg) == -ETIMEDOUT)) {
3071                 DEBUG_REQ(D_ERROR, req, "request replay timed out");
3072                 GOTO(out, rc = -ETIMEDOUT);
3073         }
3074
3075         if (lustre_msg_get_type(req->rq_repmsg) == PTL_RPC_MSG_ERR &&
3076             (lustre_msg_get_status(req->rq_repmsg) == -ENOTCONN ||
3077             lustre_msg_get_status(req->rq_repmsg) == -ENODEV))
3078                 GOTO(out, rc = lustre_msg_get_status(req->rq_repmsg));
3079
3080         /** VBR: check version failure */
3081         if (lustre_msg_get_status(req->rq_repmsg) == -EOVERFLOW) {
3082                 /** replay was failed due to version mismatch */
3083                 DEBUG_REQ(D_WARNING, req, "Version mismatch during replay");
3084                 spin_lock(&imp->imp_lock);
3085                 imp->imp_vbr_failed = 1;
3086                 spin_unlock(&imp->imp_lock);
3087                 lustre_msg_set_status(req->rq_repmsg, aa->praa_old_status);
3088         } else {
3089                 /** The transno had better not change over replay. */
3090                 LASSERTF(lustre_msg_get_transno(req->rq_reqmsg) ==
3091                          lustre_msg_get_transno(req->rq_repmsg) ||
3092                          lustre_msg_get_transno(req->rq_repmsg) == 0,
3093                          "%#llx/%#llx\n",
3094                          lustre_msg_get_transno(req->rq_reqmsg),
3095                          lustre_msg_get_transno(req->rq_repmsg));
3096         }
3097
3098         spin_lock(&imp->imp_lock);
3099         imp->imp_last_replay_transno = lustre_msg_get_transno(req->rq_reqmsg);
3100         spin_unlock(&imp->imp_lock);
3101         LASSERT(imp->imp_last_replay_transno);
3102
3103         /* transaction number shouldn't be bigger than the latest replayed */
3104         if (req->rq_transno > lustre_msg_get_transno(req->rq_reqmsg)) {
3105                 DEBUG_REQ(D_ERROR, req,
3106                           "Reported transno=%llu is bigger than replayed=%llu",
3107                           req->rq_transno,
3108                           lustre_msg_get_transno(req->rq_reqmsg));
3109                 GOTO(out, rc = -EINVAL);
3110         }
3111
3112         DEBUG_REQ(D_HA, req, "got reply");
3113
3114         /* let the callback do fixups, possibly including in the request */
3115         if (req->rq_replay_cb)
3116                 req->rq_replay_cb(req);
3117
3118         if (ptlrpc_client_replied(req) &&
3119             lustre_msg_get_status(req->rq_repmsg) != aa->praa_old_status) {
3120                 DEBUG_REQ(D_ERROR, req, "status %d, old was %d",
3121                           lustre_msg_get_status(req->rq_repmsg),
3122                           aa->praa_old_status);
3123
3124                 /*
3125                  * Note: If the replay fails for MDT-MDT recovery, let's
3126                  * abort all of the following requests in the replay
3127                  * and sending list, because MDT-MDT update requests
3128                  * are dependent on each other, see LU-7039
3129                  */
3130                 if (imp->imp_connect_flags_orig & OBD_CONNECT_MDS_MDS) {
3131                         struct ptlrpc_request *free_req;
3132                         struct ptlrpc_request *tmp;
3133
3134                         spin_lock(&imp->imp_lock);
3135                         list_for_each_entry_safe(free_req, tmp,
3136                                                  &imp->imp_replay_list,
3137                                                  rq_replay_list) {
3138                                 ptlrpc_free_request(free_req);
3139                         }
3140
3141                         list_for_each_entry_safe(free_req, tmp,
3142                                                  &imp->imp_committed_list,
3143                                                  rq_replay_list) {
3144                                 ptlrpc_free_request(free_req);
3145                         }
3146
3147                         list_for_each_entry_safe(free_req, tmp,
3148                                                  &imp->imp_delayed_list,
3149                                                  rq_list) {
3150                                 spin_lock(&free_req->rq_lock);
3151                                 free_req->rq_err = 1;
3152                                 free_req->rq_status = -EIO;
3153                                 ptlrpc_client_wake_req(free_req);
3154                                 spin_unlock(&free_req->rq_lock);
3155                         }
3156
3157                         list_for_each_entry_safe(free_req, tmp,
3158                                                  &imp->imp_sending_list,
3159                                                  rq_list) {
3160                                 spin_lock(&free_req->rq_lock);
3161                                 free_req->rq_err = 1;
3162                                 free_req->rq_status = -EIO;
3163                                 ptlrpc_client_wake_req(free_req);
3164                                 spin_unlock(&free_req->rq_lock);
3165                         }
3166                         spin_unlock(&imp->imp_lock);
3167                 }
3168         } else {
3169                 /* Put it back for re-replay. */
3170                 lustre_msg_set_status(req->rq_repmsg, aa->praa_old_status);
3171         }
3172
3173         /*
3174          * Errors while replay can set transno to 0, but
3175          * imp_last_replay_transno shouldn't be set to 0 anyway
3176          */
3177         if (req->rq_transno == 0)
3178                 CERROR("Transno is 0 during replay!\n");
3179
3180         /* continue with recovery */
3181         rc = ptlrpc_import_recovery_state_machine(imp);
3182  out:
3183         req->rq_send_state = aa->praa_old_state;
3184
3185         if (rc != 0)
3186                 /* this replay failed, so restart recovery */
3187                 ptlrpc_connect_import(imp);
3188
3189         RETURN(rc);
3190 }
3191
3192 /**
3193  * Prepares and queues request for replay.
3194  * Adds it to ptlrpcd queue for actual sending.
3195  * Returns 0 on success.
3196  */
3197 int ptlrpc_replay_req(struct ptlrpc_request *req)
3198 {
3199         struct ptlrpc_replay_async_args *aa;
3200
3201         ENTRY;
3202
3203         LASSERT(req->rq_import->imp_state == LUSTRE_IMP_REPLAY);