1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
6 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 only,
10 * as published by the Free Software Foundation.
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License version 2 for more details (a copy is included
16 * in the LICENSE file that accompanied this code).
18 * You should have received a copy of the GNU General Public License
19 * version 2 along with this program; If not, see
20 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
22 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
23 * CA 95054 USA or visit www.sun.com if you need additional information or
29 * Copyright 2008 Sun Microsystems, Inc. All rights reserved
30 * Use is subject to license terms.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
37 #define DEBUG_SUBSYSTEM S_RPC
41 #include <liblustre.h>
44 #include <obd_support.h>
45 #include <obd_class.h>
46 #include <lustre_lib.h>
47 #include <lustre_ha.h>
48 #include <lustre_import.h>
49 #include <lustre_req_layout.h>
51 #include "ptlrpc_internal.h"
53 void ptlrpc_init_client(int req_portal, int rep_portal, char *name,
54 struct ptlrpc_client *cl)
56 cl->cli_request_portal = req_portal;
57 cl->cli_reply_portal = rep_portal;
61 struct ptlrpc_connection *ptlrpc_uuid_to_connection(struct obd_uuid *uuid)
63 struct ptlrpc_connection *c;
65 lnet_process_id_t peer;
68 err = ptlrpc_uuid_to_peer(uuid, &peer, &self);
70 CERROR("cannot find peer %s!\n", uuid->uuid);
74 c = ptlrpc_connection_get(peer, self, uuid);
76 memcpy(c->c_remote_uuid.uuid,
77 uuid->uuid, sizeof(c->c_remote_uuid.uuid));
80 CDEBUG(D_INFO, "%s -> %p\n", uuid->uuid, c);
85 static inline struct ptlrpc_bulk_desc *new_bulk(int npages, int type, int portal)
87 struct ptlrpc_bulk_desc *desc;
89 OBD_ALLOC(desc, offsetof (struct ptlrpc_bulk_desc, bd_iov[npages]));
93 spin_lock_init(&desc->bd_lock);
94 cfs_waitq_init(&desc->bd_waitq);
95 desc->bd_max_iov = npages;
96 desc->bd_iov_count = 0;
97 LNetInvalidateHandle(&desc->bd_md_h);
98 desc->bd_portal = portal;
104 struct ptlrpc_bulk_desc *ptlrpc_prep_bulk_imp (struct ptlrpc_request *req,
105 int npages, int type, int portal)
107 struct obd_import *imp = req->rq_import;
108 struct ptlrpc_bulk_desc *desc;
111 LASSERT(type == BULK_PUT_SINK || type == BULK_GET_SOURCE);
112 desc = new_bulk(npages, type, portal);
116 desc->bd_import_generation = req->rq_import_generation;
117 desc->bd_import = class_import_get(imp);
120 desc->bd_cbid.cbid_fn = client_bulk_callback;
121 desc->bd_cbid.cbid_arg = desc;
123 /* This makes req own desc, and free it when she frees herself */
129 struct ptlrpc_bulk_desc *ptlrpc_prep_bulk_exp(struct ptlrpc_request *req,
130 int npages, int type, int portal)
132 struct obd_export *exp = req->rq_export;
133 struct ptlrpc_bulk_desc *desc;
136 LASSERT(type == BULK_PUT_SOURCE || type == BULK_GET_SINK);
138 desc = new_bulk(npages, type, portal);
142 desc->bd_export = class_export_get(exp);
145 desc->bd_cbid.cbid_fn = server_bulk_callback;
146 desc->bd_cbid.cbid_arg = desc;
148 /* NB we don't assign rq_bulk here; server-side requests are
149 * re-used, and the handler frees the bulk desc explicitly. */
154 void ptlrpc_prep_bulk_page(struct ptlrpc_bulk_desc *desc,
155 cfs_page_t *page, int pageoffset, int len)
157 LASSERT(desc->bd_iov_count < desc->bd_max_iov);
158 LASSERT(page != NULL);
159 LASSERT(pageoffset >= 0);
161 LASSERT(pageoffset + len <= CFS_PAGE_SIZE);
165 ptlrpc_add_bulk_page(desc, page, pageoffset, len);
168 void ptlrpc_free_bulk(struct ptlrpc_bulk_desc *desc)
172 LASSERT(desc != NULL);
173 LASSERT(desc->bd_iov_count != LI_POISON); /* not freed already */
174 LASSERT(!desc->bd_network_rw); /* network hands off or */
175 LASSERT((desc->bd_export != NULL) ^ (desc->bd_import != NULL));
177 sptlrpc_enc_pool_put_pages(desc);
180 class_export_put(desc->bd_export);
182 class_import_put(desc->bd_import);
184 OBD_FREE(desc, offsetof(struct ptlrpc_bulk_desc,
185 bd_iov[desc->bd_max_iov]));
189 /* Set server timelimit for this req */
190 void ptlrpc_at_set_req_timeout(struct ptlrpc_request *req)
196 LASSERT(req->rq_import);
199 /* non-AT settings */
200 req->rq_timeout = req->rq_import->imp_server_timeout ?
201 obd_timeout / 2 : obd_timeout;
202 lustre_msg_set_timeout(req->rq_reqmsg, req->rq_timeout);
206 at = &req->rq_import->imp_at;
207 idx = import_at_get_index(req->rq_import,
208 req->rq_request_portal);
209 serv_est = at_get(&at->iat_service_estimate[idx]);
210 /* add an arbitrary minimum: 125% +5 sec */
211 req->rq_timeout = serv_est + (serv_est >> 2) + 5;
212 /* We could get even fancier here, using history to predict increased
215 /* Let the server know what this RPC timeout is by putting it in the
217 lustre_msg_set_timeout(req->rq_reqmsg, req->rq_timeout);
220 /* Adjust max service estimate based on server value */
221 static void ptlrpc_at_adj_service(struct ptlrpc_request *req,
222 unsigned int serv_est)
228 LASSERT(req->rq_import);
229 at = &req->rq_import->imp_at;
231 idx = import_at_get_index(req->rq_import, req->rq_request_portal);
232 /* max service estimates are tracked on the server side,
233 so just keep minimal history here */
234 oldse = at_add(&at->iat_service_estimate[idx], serv_est);
236 CDEBUG(D_ADAPTTO, "The RPC service estimate for %s ptl %d "
237 "has changed from %d to %d\n",
238 req->rq_import->imp_obd->obd_name,req->rq_request_portal,
239 oldse, at_get(&at->iat_service_estimate[idx]));
242 /* Expected network latency per remote node (secs) */
243 int ptlrpc_at_get_net_latency(struct ptlrpc_request *req)
245 return AT_OFF ? 0 : at_get(&req->rq_import->imp_at.iat_net_latency);
248 /* Adjust expected network latency */
249 static void ptlrpc_at_adj_net_latency(struct ptlrpc_request *req,
250 unsigned int service_time)
252 unsigned int nl, oldnl;
254 time_t now = cfs_time_current_sec();
256 LASSERT(req->rq_import);
257 at = &req->rq_import->imp_at;
259 /* Network latency is total time less server processing time */
260 nl = max_t(int, now - req->rq_sent - service_time, 0) +1/*st rounding*/;
261 if (service_time > now - req->rq_sent + 3 /* bz16408 */)
262 CWARN("Reported service time %u > total measured time "
263 CFS_DURATION_T"\n", service_time,
264 cfs_time_sub(now, req->rq_sent));
266 oldnl = at_add(&at->iat_net_latency, nl);
268 CDEBUG(D_ADAPTTO, "The network latency for %s (nid %s) "
269 "has changed from %d to %d\n",
270 req->rq_import->imp_obd->obd_name,
272 &req->rq_import->imp_connection->c_remote_uuid),
273 oldnl, at_get(&at->iat_net_latency));
276 static int unpack_reply(struct ptlrpc_request *req)
280 /* Clear reply swab mask; we may have already swabbed an early reply */
281 req->rq_rep_swab_mask = 0;
283 rc = lustre_unpack_msg(req->rq_repmsg, req->rq_replen);
285 DEBUG_REQ(D_ERROR, req, "unpack_rep failed: %d", rc);
289 rc = lustre_unpack_rep_ptlrpc_body(req, MSG_PTLRPC_BODY_OFF);
291 DEBUG_REQ(D_ERROR, req, "unpack ptlrpc body failed: %d", rc);
298 * Handle an early reply message, called with the rq_lock held.
299 * If anything goes wrong just ignore it - same as if it never happened
301 static int ptlrpc_at_recv_early_reply(struct ptlrpc_request *req)
303 struct ptlrpc_request *early_req;
309 spin_unlock(&req->rq_lock);
311 rc = sptlrpc_cli_unwrap_early_reply(req, &early_req);
313 spin_lock(&req->rq_lock);
317 rc = unpack_reply(early_req);
319 /* Expecting to increase the service time estimate here */
320 ptlrpc_at_adj_service(req,
321 lustre_msg_get_timeout(early_req->rq_repmsg));
322 ptlrpc_at_adj_net_latency(req,
323 lustre_msg_get_service_time(early_req->rq_repmsg));
326 sptlrpc_cli_finish_early_reply(early_req);
328 spin_lock(&req->rq_lock);
331 /* Adjust the local timeout for this req */
332 ptlrpc_at_set_req_timeout(req);
334 olddl = req->rq_deadline;
335 /* server assumes it now has rq_timeout from when it sent the
336 early reply, so client should give it at least that long. */
337 req->rq_deadline = cfs_time_current_sec() + req->rq_timeout +
338 ptlrpc_at_get_net_latency(req);
340 DEBUG_REQ(D_ADAPTTO, req,
341 "Early reply #%d, new deadline in "CFS_DURATION_T"s "
342 "("CFS_DURATION_T"s)", req->rq_early_count,
343 cfs_time_sub(req->rq_deadline,
344 cfs_time_current_sec()),
345 cfs_time_sub(req->rq_deadline, olddl));
351 void ptlrpc_free_rq_pool(struct ptlrpc_request_pool *pool)
353 struct list_head *l, *tmp;
354 struct ptlrpc_request *req;
359 list_for_each_safe(l, tmp, &pool->prp_req_list) {
360 req = list_entry(l, struct ptlrpc_request, rq_list);
361 list_del(&req->rq_list);
362 LASSERT(req->rq_reqbuf);
363 LASSERT(req->rq_reqbuf_len == pool->prp_rq_size);
364 OBD_FREE(req->rq_reqbuf, pool->prp_rq_size);
365 OBD_FREE(req, sizeof(*req));
367 OBD_FREE(pool, sizeof(*pool));
370 void ptlrpc_add_rqs_to_pool(struct ptlrpc_request_pool *pool, int num_rq)
375 while (size < pool->prp_rq_size + SPTLRPC_MAX_PAYLOAD)
378 LASSERTF(list_empty(&pool->prp_req_list) || size == pool->prp_rq_size,
379 "Trying to change pool size with nonempty pool "
380 "from %d to %d bytes\n", pool->prp_rq_size, size);
382 spin_lock(&pool->prp_lock);
383 pool->prp_rq_size = size;
384 for (i = 0; i < num_rq; i++) {
385 struct ptlrpc_request *req;
386 struct lustre_msg *msg;
388 spin_unlock(&pool->prp_lock);
389 OBD_ALLOC(req, sizeof(struct ptlrpc_request));
392 OBD_ALLOC_GFP(msg, size, CFS_ALLOC_STD);
394 OBD_FREE(req, sizeof(struct ptlrpc_request));
397 req->rq_reqbuf = msg;
398 req->rq_reqbuf_len = size;
400 spin_lock(&pool->prp_lock);
401 list_add_tail(&req->rq_list, &pool->prp_req_list);
403 spin_unlock(&pool->prp_lock);
407 struct ptlrpc_request_pool *ptlrpc_init_rq_pool(int num_rq, int msgsize,
408 void (*populate_pool)(struct ptlrpc_request_pool *, int))
410 struct ptlrpc_request_pool *pool;
412 OBD_ALLOC(pool, sizeof (struct ptlrpc_request_pool));
416 /* Request next power of two for the allocation, because internally
417 kernel would do exactly this */
419 spin_lock_init(&pool->prp_lock);
420 CFS_INIT_LIST_HEAD(&pool->prp_req_list);
421 pool->prp_rq_size = msgsize;
422 pool->prp_populate = populate_pool;
424 populate_pool(pool, num_rq);
426 if (list_empty(&pool->prp_req_list)) {
427 /* have not allocated a single request for the pool */
428 OBD_FREE(pool, sizeof (struct ptlrpc_request_pool));
434 static struct ptlrpc_request *ptlrpc_prep_req_from_pool(struct ptlrpc_request_pool *pool)
436 struct ptlrpc_request *request;
437 struct lustre_msg *reqbuf;
442 spin_lock(&pool->prp_lock);
444 /* See if we have anything in a pool, and bail out if nothing,
445 * in writeout path, where this matters, this is safe to do, because
446 * nothing is lost in this case, and when some in-flight requests
447 * complete, this code will be called again. */
448 if (unlikely(list_empty(&pool->prp_req_list))) {
449 spin_unlock(&pool->prp_lock);
453 request = list_entry(pool->prp_req_list.next, struct ptlrpc_request,
455 list_del(&request->rq_list);
456 spin_unlock(&pool->prp_lock);
458 LASSERT(request->rq_reqbuf);
459 LASSERT(request->rq_pool);
461 reqbuf = request->rq_reqbuf;
462 memset(request, 0, sizeof(*request));
463 request->rq_reqbuf = reqbuf;
464 request->rq_reqbuf_len = pool->prp_rq_size;
465 request->rq_pool = pool;
470 static void __ptlrpc_free_req_to_pool(struct ptlrpc_request *request)
472 struct ptlrpc_request_pool *pool = request->rq_pool;
474 spin_lock(&pool->prp_lock);
475 LASSERT(list_empty(&request->rq_list));
476 list_add_tail(&request->rq_list, &pool->prp_req_list);
477 spin_unlock(&pool->prp_lock);
480 static int __ptlrpc_request_bufs_pack(struct ptlrpc_request *request,
481 __u32 version, int opcode,
482 int count, __u32 *lengths, char **bufs,
483 struct ptlrpc_cli_ctx *ctx)
485 struct obd_import *imp = request->rq_import;
490 request->rq_cli_ctx = sptlrpc_cli_ctx_get(ctx);
492 rc = sptlrpc_req_get_ctx(request);
497 sptlrpc_req_set_flavor(request, opcode);
499 rc = lustre_pack_request(request, imp->imp_msg_magic, count,
502 LASSERT(!request->rq_pool);
506 lustre_msg_add_version(request->rq_reqmsg, version);
507 request->rq_send_state = LUSTRE_IMP_FULL;
508 request->rq_type = PTL_RPC_MSG_REQUEST;
509 request->rq_export = NULL;
511 request->rq_req_cbid.cbid_fn = request_out_callback;
512 request->rq_req_cbid.cbid_arg = request;
514 request->rq_reply_cbid.cbid_fn = reply_in_callback;
515 request->rq_reply_cbid.cbid_arg = request;
517 request->rq_phase = RQ_PHASE_NEW;
519 request->rq_request_portal = imp->imp_client->cli_request_portal;
520 request->rq_reply_portal = imp->imp_client->cli_reply_portal;
522 ptlrpc_at_set_req_timeout(request);
524 spin_lock_init(&request->rq_lock);
525 CFS_INIT_LIST_HEAD(&request->rq_list);
526 CFS_INIT_LIST_HEAD(&request->rq_timed_list);
527 CFS_INIT_LIST_HEAD(&request->rq_replay_list);
528 CFS_INIT_LIST_HEAD(&request->rq_mod_list);
529 CFS_INIT_LIST_HEAD(&request->rq_ctx_chain);
530 CFS_INIT_LIST_HEAD(&request->rq_set_chain);
531 CFS_INIT_LIST_HEAD(&request->rq_history_list);
532 cfs_waitq_init(&request->rq_reply_waitq);
533 request->rq_xid = ptlrpc_next_xid();
534 atomic_set(&request->rq_refcount, 1);
536 lustre_msg_set_opc(request->rq_reqmsg, opcode);
540 sptlrpc_cli_ctx_put(request->rq_cli_ctx, 1);
542 class_import_put(imp);
546 int ptlrpc_request_bufs_pack(struct ptlrpc_request *request,
547 __u32 version, int opcode, char **bufs,
548 struct ptlrpc_cli_ctx *ctx)
552 count = req_capsule_filled_sizes(&request->rq_pill, RCL_CLIENT);
553 return __ptlrpc_request_bufs_pack(request, version, opcode, count,
554 request->rq_pill.rc_area[RCL_CLIENT],
557 EXPORT_SYMBOL(ptlrpc_request_bufs_pack);
559 int ptlrpc_request_pack(struct ptlrpc_request *request,
560 __u32 version, int opcode)
562 return ptlrpc_request_bufs_pack(request, version, opcode, NULL, NULL);
566 struct ptlrpc_request *__ptlrpc_request_alloc(struct obd_import *imp,
567 struct ptlrpc_request_pool *pool)
569 struct ptlrpc_request *request = NULL;
572 request = ptlrpc_prep_req_from_pool(pool);
575 OBD_ALLOC_PTR(request);
578 LASSERTF((unsigned long)imp > 0x1000, "%p", imp);
579 LASSERT(imp != LP_POISON);
580 LASSERTF((unsigned long)imp->imp_client > 0x1000, "%p",
582 LASSERT(imp->imp_client != LP_POISON);
584 request->rq_import = class_import_get(imp);
586 CERROR("request allocation out of memory\n");
592 static struct ptlrpc_request *
593 ptlrpc_request_alloc_internal(struct obd_import *imp,
594 struct ptlrpc_request_pool * pool,
595 const struct req_format *format)
597 struct ptlrpc_request *request;
599 request = __ptlrpc_request_alloc(imp, pool);
603 req_capsule_init(&request->rq_pill, request, RCL_CLIENT);
604 req_capsule_set(&request->rq_pill, format);
608 struct ptlrpc_request *ptlrpc_request_alloc(struct obd_import *imp,
609 const struct req_format *format)
611 return ptlrpc_request_alloc_internal(imp, NULL, format);
614 struct ptlrpc_request *ptlrpc_request_alloc_pool(struct obd_import *imp,
615 struct ptlrpc_request_pool * pool,
616 const struct req_format *format)
618 return ptlrpc_request_alloc_internal(imp, pool, format);
621 void ptlrpc_request_free(struct ptlrpc_request *request)
623 if (request->rq_pool)
624 __ptlrpc_free_req_to_pool(request);
626 OBD_FREE_PTR(request);
629 struct ptlrpc_request *ptlrpc_request_alloc_pack(struct obd_import *imp,
630 const struct req_format *format,
631 __u32 version, int opcode)
633 struct ptlrpc_request *req = ptlrpc_request_alloc(imp, format);
637 rc = ptlrpc_request_pack(req, version, opcode);
639 ptlrpc_request_free(req);
646 struct ptlrpc_request *
647 ptlrpc_prep_req_pool(struct obd_import *imp,
648 __u32 version, int opcode,
649 int count, __u32 *lengths, char **bufs,
650 struct ptlrpc_request_pool *pool)
652 struct ptlrpc_request *request;
655 request = __ptlrpc_request_alloc(imp, pool);
659 rc = __ptlrpc_request_bufs_pack(request, version, opcode, count,
660 lengths, bufs, NULL);
662 ptlrpc_request_free(request);
668 struct ptlrpc_request *
669 ptlrpc_prep_req(struct obd_import *imp, __u32 version, int opcode, int count,
670 __u32 *lengths, char **bufs)
672 return ptlrpc_prep_req_pool(imp, version, opcode, count, lengths, bufs,
676 struct ptlrpc_request_set *ptlrpc_prep_set(void)
678 struct ptlrpc_request_set *set;
681 OBD_ALLOC(set, sizeof *set);
684 CFS_INIT_LIST_HEAD(&set->set_requests);
685 cfs_waitq_init(&set->set_waitq);
686 set->set_remaining = 0;
687 spin_lock_init(&set->set_new_req_lock);
688 CFS_INIT_LIST_HEAD(&set->set_new_requests);
689 CFS_INIT_LIST_HEAD(&set->set_cblist);
694 /* Finish with this set; opposite of prep_set. */
695 void ptlrpc_set_destroy(struct ptlrpc_request_set *set)
697 struct list_head *tmp;
698 struct list_head *next;
703 /* Requests on the set should either all be completed, or all be new */
704 expected_phase = (set->set_remaining == 0) ?
705 RQ_PHASE_COMPLETE : RQ_PHASE_NEW;
706 list_for_each (tmp, &set->set_requests) {
707 struct ptlrpc_request *req =
708 list_entry(tmp, struct ptlrpc_request, rq_set_chain);
710 LASSERT(req->rq_phase == expected_phase);
714 LASSERT(set->set_remaining == 0 || set->set_remaining == n);
716 list_for_each_safe(tmp, next, &set->set_requests) {
717 struct ptlrpc_request *req =
718 list_entry(tmp, struct ptlrpc_request, rq_set_chain);
719 list_del_init(&req->rq_set_chain);
721 LASSERT(req->rq_phase == expected_phase);
723 if (req->rq_phase == RQ_PHASE_NEW) {
725 if (req->rq_interpret_reply != NULL) {
726 ptlrpc_interpterer_t interpreter =
727 req->rq_interpret_reply;
729 /* higher level (i.e. LOV) failed;
730 * let the sub reqs clean up */
731 req->rq_status = -EBADR;
732 interpreter(NULL, req, &req->rq_async_args,
735 set->set_remaining--;
739 ptlrpc_req_finished (req);
742 LASSERT(set->set_remaining == 0);
744 OBD_FREE(set, sizeof(*set));
748 int ptlrpc_set_add_cb(struct ptlrpc_request_set *set,
749 set_interpreter_func fn, void *data)
751 struct ptlrpc_set_cbdata *cbdata;
753 OBD_ALLOC_PTR(cbdata);
757 cbdata->psc_interpret = fn;
758 cbdata->psc_data = data;
759 list_add_tail(&cbdata->psc_item, &set->set_cblist);
764 void ptlrpc_set_add_req(struct ptlrpc_request_set *set,
765 struct ptlrpc_request *req)
767 /* The set takes over the caller's request reference */
768 list_add_tail(&req->rq_set_chain, &set->set_requests);
770 set->set_remaining++;
772 atomic_inc(&req->rq_import->imp_inflight);
776 * Lock so many callers can add things, the context that owns the set
777 * is supposed to notice these and move them into the set proper.
779 int ptlrpc_set_add_new_req(struct ptlrpcd_ctl *pc,
780 struct ptlrpc_request *req)
782 struct ptlrpc_request_set *set = pc->pc_set;
785 * Let caller know that we stopped and will not handle this request.
786 * It needs to take care itself of request.
788 if (test_bit(LIOD_STOP, &pc->pc_flags))
791 spin_lock(&set->set_new_req_lock);
793 * The set takes over the caller's request reference.
795 list_add_tail(&req->rq_set_chain, &set->set_new_requests);
797 spin_unlock(&set->set_new_req_lock);
800 * Let thead know that we added something and better it to wake up
803 cfs_waitq_signal(&set->set_waitq);
808 * Based on the current state of the import, determine if the request
809 * can be sent, is an error, or should be delayed.
811 * Returns true if this request should be delayed. If false, and
812 * *status is set, then the request can not be sent and *status is the
813 * error code. If false and status is 0, then request can be sent.
815 * The imp->imp_lock must be held.
817 static int ptlrpc_import_delay_req(struct obd_import *imp,
818 struct ptlrpc_request *req, int *status)
823 LASSERT (status != NULL);
826 if (req->rq_ctx_init || req->rq_ctx_fini) {
827 /* always allow ctx init/fini rpc go through */
828 } else if (imp->imp_state == LUSTRE_IMP_NEW) {
829 DEBUG_REQ(D_ERROR, req, "Uninitialized import.");
832 } else if (imp->imp_state == LUSTRE_IMP_CLOSED) {
833 DEBUG_REQ(D_ERROR, req, "IMP_CLOSED ");
835 } else if (req->rq_send_state == LUSTRE_IMP_CONNECTING &&
836 imp->imp_state == LUSTRE_IMP_CONNECTING) {
837 /* allow CONNECT even if import is invalid */ ;
838 if (atomic_read(&imp->imp_inval_count) != 0) {
839 DEBUG_REQ(D_ERROR, req, "invalidate in flight");
842 } else if ((imp->imp_invalid && (!imp->imp_recon_bk)) ||
843 imp->imp_obd->obd_no_recov) {
844 /* If the import has been invalidated (such as by an OST
845 * failure), and if the import(MGC) tried all of its connection
846 * list (Bug 13464), the request must fail with -ESHUTDOWN.
847 * This indicates the requests should be discarded; an -EIO
848 * may result in a resend of the request. */
849 if (!imp->imp_deactive)
850 DEBUG_REQ(D_ERROR, req, "IMP_INVALID");
851 *status = -ESHUTDOWN; /* bz 12940 */
852 } else if (req->rq_import_generation != imp->imp_generation) {
853 DEBUG_REQ(D_ERROR, req, "req wrong generation:");
855 } else if (req->rq_send_state != imp->imp_state) {
856 /* invalidate in progress - any requests should be drop */
857 if (atomic_read(&imp->imp_inval_count) != 0) {
858 DEBUG_REQ(D_ERROR, req, "invalidate in flight");
860 } else if (imp->imp_dlm_fake || req->rq_no_delay) {
861 *status = -EWOULDBLOCK;
870 static int ptlrpc_check_reply(struct ptlrpc_request *req)
875 /* serialise with network callback */
876 spin_lock(&req->rq_lock);
881 if (req->rq_net_err && !req->rq_timedout) {
882 spin_unlock(&req->rq_lock);
883 rc = ptlrpc_expire_one_request(req);
884 spin_lock(&req->rq_lock);
898 ptlrpc_at_recv_early_reply(req);
899 GOTO(out, rc = 0); /* keep waiting */
904 spin_unlock(&req->rq_lock);
905 DEBUG_REQ(D_NET, req, "rc = %d for", rc);
909 static int ptlrpc_check_status(struct ptlrpc_request *req)
914 err = lustre_msg_get_status(req->rq_repmsg);
915 if (lustre_msg_get_type(req->rq_repmsg) == PTL_RPC_MSG_ERR) {
916 struct obd_import *imp = req->rq_import;
917 __u32 opc = lustre_msg_get_opc(req->rq_reqmsg);
918 LCONSOLE_ERROR_MSG(0x011,"an error occurred while communicating"
919 " with %s. The %s operation failed with %d\n",
920 libcfs_nid2str(imp->imp_connection->c_peer.nid),
921 ll_opcode2str(opc), err);
922 RETURN(err < 0 ? err : -EINVAL);
926 DEBUG_REQ(D_INFO, req, "status is %d", err);
927 } else if (err > 0) {
928 /* XXX: translate this error from net to host */
929 DEBUG_REQ(D_INFO, req, "status is %d", err);
936 * Callback function called when client receives RPC reply for \a req.
938 static int after_reply(struct ptlrpc_request *req)
940 struct obd_import *imp = req->rq_import;
941 struct obd_device *obd = req->rq_import->imp_obd;
943 struct timeval work_start;
947 LASSERT(!req->rq_receiving_reply);
949 LASSERT(req->rq_nob_received <= req->rq_repbuf_len);
952 * NB Until this point, the whole of the incoming message,
953 * including buflens, status etc is in the sender's byte order.
956 rc = sptlrpc_cli_unwrap_reply(req);
958 DEBUG_REQ(D_ERROR, req, "unwrap reply failed (%d):", rc);
963 * Security layer unwrap might ask resend this request.
968 rc = unpack_reply(req);
972 do_gettimeofday(&work_start);
973 timediff = cfs_timeval_sub(&work_start, &req->rq_arrival_time, NULL);
974 if (obd->obd_svc_stats != NULL)
975 lprocfs_counter_add(obd->obd_svc_stats, PTLRPC_REQWAIT_CNTR,
978 if (lustre_msg_get_type(req->rq_repmsg) != PTL_RPC_MSG_REPLY &&
979 lustre_msg_get_type(req->rq_repmsg) != PTL_RPC_MSG_ERR) {
980 DEBUG_REQ(D_ERROR, req, "invalid packet received (type=%u)",
981 lustre_msg_get_type(req->rq_repmsg));
985 OBD_FAIL_TIMEOUT(OBD_FAIL_PTLRPC_PAUSE_REP, obd_fail_val);
986 ptlrpc_at_adj_service(req, lustre_msg_get_timeout(req->rq_repmsg));
987 ptlrpc_at_adj_net_latency(req,
988 lustre_msg_get_service_time(req->rq_repmsg));
990 rc = ptlrpc_check_status(req);
991 imp->imp_connect_error = rc;
995 * Either we've been evicted, or the server has failed for
996 * some reason. Try to reconnect, and if that fails, punt to
999 if (ll_rpc_recoverable_error(rc)) {
1000 if (req->rq_send_state != LUSTRE_IMP_FULL ||
1001 imp->imp_obd->obd_no_recov || imp->imp_dlm_fake) {
1004 ptlrpc_request_handle_notconn(req);
1009 * Let's look if server sent slv. Do it only for RPC with
1012 ldlm_cli_update_pool(req);
1016 * Store transno in reqmsg for replay.
1018 req->rq_transno = lustre_msg_get_transno(req->rq_repmsg);
1019 lustre_msg_set_transno(req->rq_reqmsg, req->rq_transno);
1021 if (req->rq_import->imp_replayable) {
1022 spin_lock(&imp->imp_lock);
1024 * No point in adding already-committed requests to the replay
1025 * list, we will just remove them immediately. b=9829
1027 if (req->rq_transno != 0 &&
1029 lustre_msg_get_last_committed(req->rq_repmsg) ||
1031 ptlrpc_retain_replayable_request(req, imp);
1032 else if (req->rq_commit_cb != NULL) {
1033 spin_unlock(&imp->imp_lock);
1034 req->rq_commit_cb(req);
1035 spin_lock(&imp->imp_lock);
1039 * Replay-enabled imports return commit-status information.
1041 if (lustre_msg_get_last_committed(req->rq_repmsg)) {
1042 imp->imp_peer_committed_transno =
1043 lustre_msg_get_last_committed(req->rq_repmsg);
1045 ptlrpc_free_committed(imp);
1046 spin_unlock(&imp->imp_lock);
1052 static int ptlrpc_send_new_req(struct ptlrpc_request *req)
1054 struct obd_import *imp;
1058 LASSERT(req->rq_phase == RQ_PHASE_NEW);
1059 if (req->rq_sent && (req->rq_sent > cfs_time_current_sec()))
1062 req->rq_phase = RQ_PHASE_RPC;
1064 imp = req->rq_import;
1065 spin_lock(&imp->imp_lock);
1067 req->rq_import_generation = imp->imp_generation;
1069 if (ptlrpc_import_delay_req(imp, req, &rc)) {
1070 spin_lock (&req->rq_lock);
1071 req->rq_waiting = 1;
1072 spin_unlock (&req->rq_lock);
1074 DEBUG_REQ(D_HA, req, "req from PID %d waiting for recovery: "
1076 lustre_msg_get_status(req->rq_reqmsg) ,
1077 ptlrpc_import_state_name(req->rq_send_state),
1078 ptlrpc_import_state_name(imp->imp_state));
1079 LASSERT(list_empty (&req->rq_list));
1081 list_add_tail(&req->rq_list, &imp->imp_delayed_list);
1082 spin_unlock(&imp->imp_lock);
1087 spin_unlock(&imp->imp_lock);
1088 req->rq_status = rc;
1089 req->rq_phase = RQ_PHASE_INTERPRET;
1093 /* XXX this is the same as ptlrpc_queue_wait */
1094 LASSERT(list_empty(&req->rq_list));
1095 list_add_tail(&req->rq_list, &imp->imp_sending_list);
1096 spin_unlock(&imp->imp_lock);
1098 lustre_msg_set_status(req->rq_reqmsg, cfs_curproc_pid());
1100 rc = sptlrpc_req_refresh_ctx(req, -1);
1103 req->rq_status = rc;
1106 req->rq_wait_ctx = 1;
1111 CDEBUG(D_RPCTRACE, "Sending RPC pname:cluuid:pid:xid:nid:opc"
1112 " %s:%s:%d:"LPU64":%s:%d\n", cfs_curproc_comm(),
1113 imp->imp_obd->obd_uuid.uuid,
1114 lustre_msg_get_status(req->rq_reqmsg), req->rq_xid,
1115 libcfs_nid2str(imp->imp_connection->c_peer.nid),
1116 lustre_msg_get_opc(req->rq_reqmsg));
1118 rc = ptl_send_rpc(req, 0);
1120 DEBUG_REQ(D_HA, req, "send failed (%d); expect timeout", rc);
1121 req->rq_net_err = 1;
1127 /* this sends any unsent RPCs in @set and returns TRUE if all are sent */
1128 int ptlrpc_check_set(const struct lu_env *env, struct ptlrpc_request_set *set)
1130 struct list_head *tmp;
1131 int force_timer_recalc = 0;
1134 if (set->set_remaining == 0)
1137 list_for_each(tmp, &set->set_requests) {
1138 struct ptlrpc_request *req =
1139 list_entry(tmp, struct ptlrpc_request, rq_set_chain);
1140 struct obd_import *imp = req->rq_import;
1143 if (req->rq_phase == RQ_PHASE_NEW &&
1144 ptlrpc_send_new_req(req)) {
1145 force_timer_recalc = 1;
1147 /* delayed send - skip */
1148 if (req->rq_phase == RQ_PHASE_NEW && req->rq_sent)
1151 if (!(req->rq_phase == RQ_PHASE_RPC ||
1152 req->rq_phase == RQ_PHASE_BULK ||
1153 req->rq_phase == RQ_PHASE_INTERPRET ||
1154 req->rq_phase == RQ_PHASE_COMPLETE)) {
1155 DEBUG_REQ(D_ERROR, req, "bad phase %x", req->rq_phase);
1159 if (req->rq_phase == RQ_PHASE_COMPLETE)
1162 if (req->rq_phase == RQ_PHASE_INTERPRET)
1163 GOTO(interpret, req->rq_status);
1165 if (req->rq_net_err && !req->rq_timedout)
1166 ptlrpc_expire_one_request(req);
1169 ptlrpc_unregister_reply(req);
1170 req->rq_replied = 0;
1171 if (req->rq_status == 0)
1172 req->rq_status = -EIO;
1173 req->rq_phase = RQ_PHASE_INTERPRET;
1175 spin_lock(&imp->imp_lock);
1176 list_del_init(&req->rq_list);
1177 spin_unlock(&imp->imp_lock);
1179 GOTO(interpret, req->rq_status);
1182 /* ptlrpc_queue_wait->l_wait_event guarantees that rq_intr
1183 * will only be set after rq_timedout, but the oig waiting
1184 * path sets rq_intr irrespective of whether ptlrpcd has
1185 * seen a timeout. our policy is to only interpret
1186 * interrupted rpcs after they have timed out */
1187 if (req->rq_intr && (req->rq_timedout || req->rq_waiting ||
1188 req->rq_wait_ctx)) {
1189 /* NB could be on delayed list */
1190 ptlrpc_unregister_reply(req);
1191 req->rq_status = -EINTR;
1192 req->rq_phase = RQ_PHASE_INTERPRET;
1194 spin_lock(&imp->imp_lock);
1195 list_del_init(&req->rq_list);
1196 spin_unlock(&imp->imp_lock);
1198 GOTO(interpret, req->rq_status);
1201 if (req->rq_phase == RQ_PHASE_RPC) {
1202 if (req->rq_timedout || req->rq_resend ||
1203 req->rq_waiting || req->rq_wait_ctx) {
1206 ptlrpc_unregister_reply(req);
1208 spin_lock(&imp->imp_lock);
1210 if (ptlrpc_import_delay_req(imp, req, &status)){
1211 spin_unlock(&imp->imp_lock);
1215 list_del_init(&req->rq_list);
1217 req->rq_status = status;
1218 req->rq_phase = RQ_PHASE_INTERPRET;
1219 spin_unlock(&imp->imp_lock);
1220 GOTO(interpret, req->rq_status);
1222 if (req->rq_no_resend && !req->rq_wait_ctx) {
1223 req->rq_status = -ENOTCONN;
1224 req->rq_phase = RQ_PHASE_INTERPRET;
1225 spin_unlock(&imp->imp_lock);
1226 GOTO(interpret, req->rq_status);
1228 list_add_tail(&req->rq_list,
1229 &imp->imp_sending_list);
1231 spin_unlock(&imp->imp_lock);
1233 req->rq_waiting = 0;
1235 if (req->rq_timedout||req->rq_resend) {
1236 /* This is re-sending anyways,
1237 * let's mark req as resend. */
1239 lustre_msg_add_flags(req->rq_reqmsg,
1242 __u64 old_xid = req->rq_xid;
1244 ptlrpc_unregister_bulk (req);
1246 /* ensure previous bulk fails */
1247 req->rq_xid = ptlrpc_next_xid();
1248 CDEBUG(D_HA, "resend bulk "
1251 old_xid, req->rq_xid);
1255 * rq_wait_ctx is only touched by ptlrpcd,
1256 * so no lock is needed here.
1258 status = sptlrpc_req_refresh_ctx(req, -1);
1261 req->rq_status = status;
1262 force_timer_recalc = 1;
1264 req->rq_wait_ctx = 1;
1269 req->rq_wait_ctx = 0;
1272 rc = ptl_send_rpc(req, 0);
1274 DEBUG_REQ(D_HA, req, "send failed (%d)",
1276 force_timer_recalc = 1;
1277 req->rq_net_err = 1;
1279 /* need to reset the timeout */
1280 force_timer_recalc = 1;
1283 spin_lock(&req->rq_lock);
1285 if (req->rq_early) {
1286 ptlrpc_at_recv_early_reply(req);
1287 spin_unlock(&req->rq_lock);
1291 /* Still waiting for a reply? */
1292 if (req->rq_receiving_reply) {
1293 spin_unlock(&req->rq_lock);
1297 /* Did we actually receive a reply? */
1298 if (!req->rq_replied) {
1299 spin_unlock(&req->rq_lock);
1303 spin_unlock(&req->rq_lock);
1305 spin_lock(&imp->imp_lock);
1306 list_del_init(&req->rq_list);
1307 spin_unlock(&imp->imp_lock);
1309 req->rq_status = after_reply(req);
1310 if (req->rq_resend) {
1311 /* Add this req to the delayed list so
1312 it can be errored if the import is
1313 evicted after recovery. */
1314 spin_lock(&imp->imp_lock);
1315 list_add_tail(&req->rq_list,
1316 &imp->imp_delayed_list);
1317 spin_unlock(&imp->imp_lock);
1321 /* If there is no bulk associated with this request,
1322 * then we're done and should let the interpreter
1323 * process the reply. Similarly if the RPC returned
1324 * an error, and therefore the bulk will never arrive.
1326 if (req->rq_bulk == NULL || req->rq_status != 0) {
1327 req->rq_phase = RQ_PHASE_INTERPRET;
1328 GOTO(interpret, req->rq_status);
1331 req->rq_phase = RQ_PHASE_BULK;
1334 LASSERT(req->rq_phase == RQ_PHASE_BULK);
1335 if (ptlrpc_bulk_active(req->rq_bulk))
1338 if (!req->rq_bulk->bd_success) {
1339 /* The RPC reply arrived OK, but the bulk screwed
1340 * up! Dead wierd since the server told us the RPC
1341 * was good after getting the REPLY for her GET or
1342 * the ACK for her PUT. */
1343 DEBUG_REQ(D_ERROR, req, "bulk transfer failed");
1347 req->rq_phase = RQ_PHASE_INTERPRET;
1350 LASSERT(req->rq_phase == RQ_PHASE_INTERPRET);
1351 LASSERT(!req->rq_receiving_reply);
1353 ptlrpc_unregister_reply(req);
1354 if (req->rq_bulk != NULL)
1355 ptlrpc_unregister_bulk (req);
1357 if (req->rq_interpret_reply != NULL) {
1358 ptlrpc_interpterer_t interpreter =
1359 req->rq_interpret_reply;
1360 req->rq_status = interpreter(NULL, req,
1361 &req->rq_async_args,
1364 req->rq_phase = RQ_PHASE_COMPLETE;
1366 CDEBUG(D_RPCTRACE, "Completed RPC pname:cluuid:pid:xid:nid:"
1367 "opc %s:%s:%d:"LPU64":%s:%d\n", cfs_curproc_comm(),
1368 imp->imp_obd->obd_uuid.uuid,
1369 lustre_msg_get_status(req->rq_reqmsg), req->rq_xid,
1370 libcfs_nid2str(imp->imp_connection->c_peer.nid),
1371 lustre_msg_get_opc(req->rq_reqmsg));
1373 atomic_dec(&imp->imp_inflight);
1374 set->set_remaining--;
1375 cfs_waitq_signal(&imp->imp_recovery_waitq);
1378 /* If we hit an error, we want to recover promptly. */
1379 RETURN(set->set_remaining == 0 || force_timer_recalc);
1382 /* Return 1 if we should give up, else 0 */
1383 int ptlrpc_expire_one_request(struct ptlrpc_request *req)
1385 struct obd_import *imp = req->rq_import;
1389 DEBUG_REQ(D_ERROR|D_NETERROR, req,
1390 "%s (sent at "CFS_TIME_T", "CFS_DURATION_T"s ago)",
1391 req->rq_net_err ? "network error" : "timeout",
1392 req->rq_sent, cfs_time_sub(cfs_time_current_sec(),
1396 LCONSOLE_WARN("Request x"LPU64" sent from %s to NID %s "
1397 CFS_DURATION_T"s ago has timed out "
1398 "(limit "CFS_DURATION_T"s).\n", req->rq_xid,
1399 req->rq_import->imp_obd->obd_name,
1400 libcfs_nid2str(imp->imp_connection->c_peer.nid),
1401 cfs_time_sub(cfs_time_current_sec(), req->rq_sent),
1402 cfs_time_sub(req->rq_deadline, req->rq_sent));
1405 if (imp != NULL && obd_debug_peer_on_timeout)
1406 LNetCtl(IOC_LIBCFS_DEBUG_PEER, &imp->imp_connection->c_peer);
1408 spin_lock(&req->rq_lock);
1409 req->rq_timedout = 1;
1410 spin_unlock(&req->rq_lock);
1412 ptlrpc_unregister_reply (req);
1414 if (obd_dump_on_timeout)
1415 libcfs_debug_dumplog();
1417 if (req->rq_bulk != NULL)
1418 ptlrpc_unregister_bulk (req);
1421 DEBUG_REQ(D_HA, req, "NULL import: already cleaned up?");
1425 /* The DLM server doesn't want recovery run on its imports. */
1426 if (imp->imp_dlm_fake)
1429 /* If this request is for recovery or other primordial tasks,
1430 * then error it out here. */
1431 if (req->rq_ctx_init || req->rq_ctx_fini ||
1432 req->rq_send_state != LUSTRE_IMP_FULL ||
1433 imp->imp_obd->obd_no_recov) {
1434 DEBUG_REQ(D_RPCTRACE, req, "err -110, sent_state=%s (now=%s)",
1435 ptlrpc_import_state_name(req->rq_send_state),
1436 ptlrpc_import_state_name(imp->imp_state));
1437 spin_lock(&req->rq_lock);
1438 req->rq_status = -ETIMEDOUT;
1440 spin_unlock(&req->rq_lock);
1444 /* if a request can't be resent we can't wait for an answer after
1446 if (req->rq_no_resend) {
1447 DEBUG_REQ(D_RPCTRACE, req, "TIMEOUT-NORESEND:");
1451 ptlrpc_fail_import(imp, lustre_msg_get_conn_cnt(req->rq_reqmsg));
1456 int ptlrpc_expired_set(void *data)
1458 struct ptlrpc_request_set *set = data;
1459 struct list_head *tmp;
1460 time_t now = cfs_time_current_sec();
1463 LASSERT(set != NULL);
1465 /* A timeout expired; see which reqs it applies to... */
1466 list_for_each (tmp, &set->set_requests) {
1467 struct ptlrpc_request *req =
1468 list_entry(tmp, struct ptlrpc_request, rq_set_chain);
1470 /* request in-flight? */
1471 if (!(((req->rq_phase == RQ_PHASE_RPC) && !req->rq_waiting &&
1473 (req->rq_phase == RQ_PHASE_BULK)))
1476 if (req->rq_timedout || /* already dealt with */
1477 req->rq_deadline > now) /* not expired */
1480 /* deal with this guy */
1481 ptlrpc_expire_one_request (req);
1484 /* When waiting for a whole set, we always to break out of the
1485 * sleep so we can recalculate the timeout, or enable interrupts
1486 * iff everyone's timed out.
1491 void ptlrpc_mark_interrupted(struct ptlrpc_request *req)
1493 spin_lock(&req->rq_lock);
1495 spin_unlock(&req->rq_lock);
1498 void ptlrpc_interrupted_set(void *data)
1500 struct ptlrpc_request_set *set = data;
1501 struct list_head *tmp;
1503 LASSERT(set != NULL);
1504 CERROR("INTERRUPTED SET %p\n", set);
1506 list_for_each(tmp, &set->set_requests) {
1507 struct ptlrpc_request *req =
1508 list_entry(tmp, struct ptlrpc_request, rq_set_chain);
1510 if (req->rq_phase != RQ_PHASE_RPC)
1513 ptlrpc_mark_interrupted(req);
1517 /* get the smallest timeout in the set; this does NOT set a timeout. */
1518 int ptlrpc_set_next_timeout(struct ptlrpc_request_set *set)
1520 struct list_head *tmp;
1521 time_t now = cfs_time_current_sec();
1523 struct ptlrpc_request *req;
1527 SIGNAL_MASK_ASSERT(); /* XXX BUG 1511 */
1529 list_for_each(tmp, &set->set_requests) {
1530 req = list_entry(tmp, struct ptlrpc_request, rq_set_chain);
1532 /* request in-flight? */
1533 if (!((req->rq_phase == RQ_PHASE_RPC && !req->rq_waiting) ||
1534 (req->rq_phase == RQ_PHASE_BULK) ||
1535 (req->rq_phase == RQ_PHASE_NEW)))
1538 if (req->rq_timedout) /* already timed out */
1541 if (req->rq_wait_ctx) /* waiting for ctx */
1544 if (req->rq_phase == RQ_PHASE_NEW)
1545 deadline = req->rq_sent;
1547 deadline = req->rq_sent + req->rq_timeout;
1549 if (deadline <= now) /* actually expired already */
1550 timeout = 1; /* ASAP */
1551 else if (timeout == 0 || timeout > deadline - now)
1552 timeout = deadline - now;
1557 int ptlrpc_set_wait(struct ptlrpc_request_set *set)
1559 struct list_head *tmp;
1560 struct ptlrpc_request *req;
1561 struct l_wait_info lwi;
1565 if (list_empty(&set->set_requests))
1568 list_for_each(tmp, &set->set_requests) {
1569 req = list_entry(tmp, struct ptlrpc_request, rq_set_chain);
1570 if (req->rq_phase == RQ_PHASE_NEW)
1571 (void)ptlrpc_send_new_req(req);
1575 timeout = ptlrpc_set_next_timeout(set);
1577 /* wait until all complete, interrupted, or an in-flight
1579 CDEBUG(D_RPCTRACE, "set %p going to sleep for %d seconds\n",
1581 lwi = LWI_TIMEOUT_INTR(cfs_time_seconds(timeout ? timeout : 1),
1583 ptlrpc_interrupted_set, set);
1584 rc = l_wait_event(set->set_waitq,
1585 ptlrpc_check_set(NULL, set), &lwi);
1587 LASSERT(rc == 0 || rc == -EINTR || rc == -ETIMEDOUT);
1589 /* -EINTR => all requests have been flagged rq_intr so next
1591 * -ETIMEOUTD => someone timed out. When all reqs have
1592 * timed out, signals are enabled allowing completion with
1594 * I don't really care if we go once more round the loop in
1595 * the error cases -eeb. */
1596 } while (rc != 0 || set->set_remaining != 0);
1598 LASSERT(set->set_remaining == 0);
1601 list_for_each(tmp, &set->set_requests) {
1602 req = list_entry(tmp, struct ptlrpc_request, rq_set_chain);
1604 LASSERT(req->rq_phase == RQ_PHASE_COMPLETE);
1605 if (req->rq_status != 0)
1606 rc = req->rq_status;
1609 if (set->set_interpret != NULL) {
1610 int (*interpreter)(struct ptlrpc_request_set *set,void *,int) =
1612 rc = interpreter (set, set->set_arg, rc);
1614 struct ptlrpc_set_cbdata *cbdata, *n;
1617 list_for_each_entry_safe(cbdata, n,
1618 &set->set_cblist, psc_item) {
1619 list_del_init(&cbdata->psc_item);
1620 err = cbdata->psc_interpret(set, cbdata->psc_data, rc);
1623 OBD_FREE_PTR(cbdata);
1630 static void __ptlrpc_free_req(struct ptlrpc_request *request, int locked)
1633 if (request == NULL) {
1638 LASSERTF(!request->rq_receiving_reply, "req %p\n", request);
1639 LASSERTF(request->rq_rqbd == NULL, "req %p\n",request);/* client-side */
1640 LASSERTF(list_empty(&request->rq_list), "req %p\n", request);
1641 LASSERTF(list_empty(&request->rq_set_chain), "req %p\n", request);
1642 LASSERTF(!request->rq_replay, "req %p\n", request);
1643 LASSERT(request->rq_cli_ctx);
1645 req_capsule_fini(&request->rq_pill);
1647 /* We must take it off the imp_replay_list first. Otherwise, we'll set
1648 * request->rq_reqmsg to NULL while osc_close is dereferencing it. */
1649 if (request->rq_import != NULL) {
1651 spin_lock(&request->rq_import->imp_lock);
1652 list_del_init(&request->rq_mod_list);
1653 list_del_init(&request->rq_replay_list);
1655 spin_unlock(&request->rq_import->imp_lock);
1657 LASSERTF(list_empty(&request->rq_replay_list), "req %p\n", request);
1659 if (atomic_read(&request->rq_refcount) != 0) {
1660 DEBUG_REQ(D_ERROR, request,
1661 "freeing request with nonzero refcount");
1665 if (request->rq_repbuf != NULL)
1666 sptlrpc_cli_free_repbuf(request);
1667 if (request->rq_export != NULL) {
1668 class_export_put(request->rq_export);
1669 request->rq_export = NULL;
1671 if (request->rq_import != NULL) {
1672 class_import_put(request->rq_import);
1673 request->rq_import = NULL;
1675 if (request->rq_bulk != NULL)
1676 ptlrpc_free_bulk(request->rq_bulk);
1678 if (request->rq_reqbuf != NULL || request->rq_clrbuf != NULL)
1679 sptlrpc_cli_free_reqbuf(request);
1681 sptlrpc_req_put_ctx(request, !locked);
1683 if (request->rq_pool)
1684 __ptlrpc_free_req_to_pool(request);
1686 OBD_FREE(request, sizeof(*request));
1690 static int __ptlrpc_req_finished(struct ptlrpc_request *request, int locked);
1691 void ptlrpc_req_finished_with_imp_lock(struct ptlrpc_request *request)
1693 LASSERT_SPIN_LOCKED(&request->rq_import->imp_lock);
1694 (void)__ptlrpc_req_finished(request, 1);
1697 static int __ptlrpc_req_finished(struct ptlrpc_request *request, int locked)
1700 if (request == NULL)
1703 if (request == LP_POISON ||
1704 request->rq_reqmsg == LP_POISON) {
1705 CERROR("dereferencing freed request (bug 575)\n");
1710 DEBUG_REQ(D_INFO, request, "refcount now %u",
1711 atomic_read(&request->rq_refcount) - 1);
1713 if (atomic_dec_and_test(&request->rq_refcount)) {
1714 __ptlrpc_free_req(request, locked);
1721 void ptlrpc_req_finished(struct ptlrpc_request *request)
1723 __ptlrpc_req_finished(request, 0);
1726 __u64 ptlrpc_req_xid(struct ptlrpc_request *request)
1728 return request->rq_xid;
1730 EXPORT_SYMBOL(ptlrpc_req_xid);
1732 /* Disengage the client's reply buffer from the network
1733 * NB does _NOT_ unregister any client-side bulk.
1734 * IDEMPOTENT, but _not_ safe against concurrent callers.
1735 * The request owner (i.e. the thread doing the I/O) must call...
1737 void ptlrpc_unregister_reply (struct ptlrpc_request *request)
1741 struct l_wait_info lwi;
1743 LASSERT(!in_interrupt ()); /* might sleep */
1744 if (!ptlrpc_client_recv_or_unlink(request))
1745 /* Nothing left to do */
1748 LNetMDUnlink (request->rq_reply_md_h);
1750 /* We have to l_wait_event() whatever the result, to give liblustre
1751 * a chance to run reply_in_callback(), and to make sure we've
1752 * unlinked before returning a req to the pool */
1754 if (request->rq_set != NULL)
1755 wq = &request->rq_set->set_waitq;
1757 wq = &request->rq_reply_waitq;
1760 /* Network access will complete in finite time but the HUGE
1761 * timeout lets us CWARN for visibility of sluggish NALs */
1762 lwi = LWI_TIMEOUT(cfs_time_seconds(LONG_UNLINK), NULL, NULL);
1763 rc = l_wait_event (*wq, !ptlrpc_client_recv_or_unlink(request),
1768 LASSERT (rc == -ETIMEDOUT);
1769 DEBUG_REQ(D_WARNING, request, "Unexpectedly long timeout "
1770 "rvcng=%d unlnk=%d", request->rq_receiving_reply,
1771 request->rq_must_unlink);
1775 /* caller must hold imp->imp_lock */
1776 void ptlrpc_free_committed(struct obd_import *imp)
1778 struct list_head *tmp, *saved;
1779 struct ptlrpc_request *req;
1780 struct ptlrpc_request *last_req = NULL; /* temporary fire escape */
1783 LASSERT(imp != NULL);
1785 LASSERT_SPIN_LOCKED(&imp->imp_lock);
1788 if (imp->imp_peer_committed_transno == imp->imp_last_transno_checked &&
1789 imp->imp_generation == imp->imp_last_generation_checked) {
1790 CDEBUG(D_RPCTRACE, "%s: skip recheck: last_committed "LPU64"\n",
1791 imp->imp_obd->obd_name, imp->imp_peer_committed_transno);
1796 CDEBUG(D_RPCTRACE, "%s: committing for last_committed "LPU64" gen %d\n",
1797 imp->imp_obd->obd_name, imp->imp_peer_committed_transno,
1798 imp->imp_generation);
1799 imp->imp_last_transno_checked = imp->imp_peer_committed_transno;
1800 imp->imp_last_generation_checked = imp->imp_generation;
1802 list_for_each_safe(tmp, saved, &imp->imp_replay_list) {
1803 req = list_entry(tmp, struct ptlrpc_request, rq_replay_list);
1805 /* XXX ok to remove when 1357 resolved - rread 05/29/03 */
1806 LASSERT(req != last_req);
1809 if (req->rq_import_generation < imp->imp_generation) {
1810 DEBUG_REQ(D_RPCTRACE, req, "free request with old gen");
1814 if (req->rq_replay) {
1815 DEBUG_REQ(D_RPCTRACE, req, "keeping (FL_REPLAY)");
1819 /* not yet committed */
1820 if (req->rq_transno > imp->imp_peer_committed_transno) {
1821 DEBUG_REQ(D_RPCTRACE, req, "stopping search");
1825 DEBUG_REQ(D_RPCTRACE, req, "commit (last_committed "LPU64")",
1826 imp->imp_peer_committed_transno);
1828 spin_lock(&req->rq_lock);
1830 spin_unlock(&req->rq_lock);
1831 if (req->rq_commit_cb != NULL)
1832 req->rq_commit_cb(req);
1833 list_del_init(&req->rq_replay_list);
1834 __ptlrpc_req_finished(req, 1);
1841 void ptlrpc_cleanup_client(struct obd_import *imp)
1848 void ptlrpc_resend_req(struct ptlrpc_request *req)
1850 DEBUG_REQ(D_HA, req, "going to resend");
1851 lustre_msg_set_handle(req->rq_reqmsg, &(struct lustre_handle){ 0 });
1852 req->rq_status = -EAGAIN;
1854 spin_lock(&req->rq_lock);
1856 req->rq_net_err = 0;
1857 req->rq_timedout = 0;
1859 __u64 old_xid = req->rq_xid;
1861 /* ensure previous bulk fails */
1862 req->rq_xid = ptlrpc_next_xid();
1863 CDEBUG(D_HA, "resend bulk old x"LPU64" new x"LPU64"\n",
1864 old_xid, req->rq_xid);
1866 ptlrpc_wake_client_req(req);
1867 spin_unlock(&req->rq_lock);
1870 /* XXX: this function and rq_status are currently unused */
1871 void ptlrpc_restart_req(struct ptlrpc_request *req)
1873 DEBUG_REQ(D_HA, req, "restarting (possibly-)completed request");
1874 req->rq_status = -ERESTARTSYS;
1876 spin_lock(&req->rq_lock);
1877 req->rq_restart = 1;
1878 req->rq_timedout = 0;
1879 ptlrpc_wake_client_req(req);
1880 spin_unlock(&req->rq_lock);
1883 static int expired_request(void *data)
1885 struct ptlrpc_request *req = data;
1888 /* some failure can suspend regular timeouts */
1889 if (ptlrpc_check_suspend())
1892 /* deadline may have changed with an early reply */
1893 if (req->rq_deadline > cfs_time_current_sec())
1896 RETURN(ptlrpc_expire_one_request(req));
1899 static void interrupted_request(void *data)
1901 struct ptlrpc_request *req = data;
1902 DEBUG_REQ(D_HA, req, "request interrupted");
1903 spin_lock(&req->rq_lock);
1905 spin_unlock(&req->rq_lock);
1908 struct ptlrpc_request *ptlrpc_request_addref(struct ptlrpc_request *req)
1911 atomic_inc(&req->rq_refcount);
1915 void ptlrpc_retain_replayable_request(struct ptlrpc_request *req,
1916 struct obd_import *imp)
1918 struct list_head *tmp;
1920 LASSERT_SPIN_LOCKED(&imp->imp_lock);
1922 /* clear this for new requests that were resent as well
1923 as resent replayed requests. */
1924 lustre_msg_clear_flags(req->rq_reqmsg, MSG_RESENT);
1926 /* don't re-add requests that have been replayed */
1927 if (!list_empty(&req->rq_replay_list))
1930 lustre_msg_add_flags(req->rq_reqmsg, MSG_REPLAY);
1932 LASSERT(imp->imp_replayable);
1933 /* Balanced in ptlrpc_free_committed, usually. */
1934 ptlrpc_request_addref(req);
1935 list_for_each_prev(tmp, &imp->imp_replay_list) {
1936 struct ptlrpc_request *iter =
1937 list_entry(tmp, struct ptlrpc_request, rq_replay_list);
1939 /* We may have duplicate transnos if we create and then
1940 * open a file, or for closes retained if to match creating
1941 * opens, so use req->rq_xid as a secondary key.
1942 * (See bugs 684, 685, and 428.)
1943 * XXX no longer needed, but all opens need transnos!
1945 if (iter->rq_transno > req->rq_transno)
1948 if (iter->rq_transno == req->rq_transno) {
1949 LASSERT(iter->rq_xid != req->rq_xid);
1950 if (iter->rq_xid > req->rq_xid)
1954 list_add(&req->rq_replay_list, &iter->rq_replay_list);
1958 list_add_tail(&req->rq_replay_list, &imp->imp_replay_list);
1961 int ptlrpc_queue_wait(struct ptlrpc_request *req)
1965 struct l_wait_info lwi;
1966 struct obd_import *imp = req->rq_import;
1967 cfs_duration_t timeout = CFS_TICK;
1971 LASSERT(req->rq_set == NULL);
1972 LASSERT(!req->rq_receiving_reply);
1973 atomic_inc(&imp->imp_inflight);
1975 /* for distributed debugging */
1976 lustre_msg_set_status(req->rq_reqmsg, cfs_curproc_pid());
1977 LASSERT(imp->imp_obd != NULL);
1978 CDEBUG(D_RPCTRACE, "Sending RPC pname:cluuid:pid:xid:nid:opc "
1979 "%s:%s:%d:"LPU64":%s:%d\n", cfs_curproc_comm(),
1980 imp->imp_obd->obd_uuid.uuid,
1981 lustre_msg_get_status(req->rq_reqmsg), req->rq_xid,
1982 libcfs_nid2str(imp->imp_connection->c_peer.nid),
1983 lustre_msg_get_opc(req->rq_reqmsg));
1985 /* Mark phase here for a little debug help */
1986 req->rq_phase = RQ_PHASE_RPC;
1988 spin_lock(&imp->imp_lock);
1989 req->rq_import_generation = imp->imp_generation;
1991 if (ptlrpc_import_delay_req(imp, req, &rc)) {
1992 list_del(&req->rq_list);
1994 list_add_tail(&req->rq_list, &imp->imp_delayed_list);
1995 spin_unlock(&imp->imp_lock);
1997 DEBUG_REQ(D_HA, req, "\"%s\" waiting for recovery: (%s != %s)",
1999 ptlrpc_import_state_name(req->rq_send_state),
2000 ptlrpc_import_state_name(imp->imp_state));
2001 lwi = LWI_INTR(interrupted_request, req);
2002 rc = l_wait_event(req->rq_reply_waitq,
2003 (req->rq_send_state == imp->imp_state ||
2004 req->rq_err || req->rq_intr),
2006 DEBUG_REQ(D_HA, req, "\"%s\" awake: (%s == %s or %d/%d == 1)",
2008 ptlrpc_import_state_name(imp->imp_state),
2009 ptlrpc_import_state_name(req->rq_send_state),
2010 req->rq_err, req->rq_intr);
2012 spin_lock(&imp->imp_lock);
2013 list_del_init(&req->rq_list);
2016 /* rq_status was set locally */
2019 else if (req->rq_intr) {
2022 else if (req->rq_no_resend) {
2023 spin_unlock(&imp->imp_lock);
2024 GOTO(out, rc = -ETIMEDOUT);
2032 list_del_init(&req->rq_list);
2033 spin_unlock(&imp->imp_lock);
2034 req->rq_status = rc; // XXX this ok?
2038 if (req->rq_resend) {
2039 lustre_msg_add_flags(req->rq_reqmsg, MSG_RESENT);
2041 if (req->rq_bulk != NULL) {
2042 ptlrpc_unregister_bulk (req);
2044 /* bulk requests are supposed to be
2045 * idempotent, so we are free to bump the xid
2046 * here, which we need to do before
2047 * registering the bulk again (bug 6371).
2048 * print the old xid first for sanity.
2050 DEBUG_REQ(D_HA, req, "bumping xid for bulk: ");
2051 req->rq_xid = ptlrpc_next_xid();
2054 DEBUG_REQ(D_HA, req, "resending: ");
2057 /* XXX this is the same as ptlrpc_set_wait */
2058 LASSERT(list_empty(&req->rq_list));
2059 list_add_tail(&req->rq_list, &imp->imp_sending_list);
2060 spin_unlock(&imp->imp_lock);
2062 rc = sptlrpc_req_refresh_ctx(req, 0);
2065 /* we got fatal ctx refresh error, directly jump out
2066 * thus we can pass back the actual error code.
2068 spin_lock(&imp->imp_lock);
2069 list_del_init(&req->rq_list);
2070 spin_unlock(&imp->imp_lock);
2072 CERROR("Failed to refresh ctx of req %p: %d\n", req, rc);
2075 /* simulating we got error during send rpc */
2079 rc = ptl_send_rpc(req, 0);
2081 DEBUG_REQ(D_HA, req, "send failed (%d); recovering", rc);
2084 timeoutl = req->rq_deadline - cfs_time_current_sec();
2085 timeout = (timeoutl <= 0 || rc) ? CFS_TICK :
2086 cfs_time_seconds(timeoutl);
2087 DEBUG_REQ(D_NET, req,
2088 "-- sleeping for "CFS_DURATION_T" ticks", timeout);
2089 lwi = LWI_TIMEOUT_INTR(timeout, expired_request, interrupted_request,
2091 brc = l_wait_event(req->rq_reply_waitq, ptlrpc_check_reply(req), &lwi);
2092 if (brc == -ETIMEDOUT && ((req->rq_deadline > cfs_time_current_sec()) ||
2093 ptlrpc_check_and_wait_suspend(req)))
2097 CDEBUG(D_RPCTRACE, "Completed RPC pname:cluuid:pid:xid:nid:opc "
2098 "%s:%s:%d:"LPU64":%s:%d\n", cfs_curproc_comm(),
2099 imp->imp_obd->obd_uuid.uuid,
2100 lustre_msg_get_status(req->rq_reqmsg), req->rq_xid,
2101 libcfs_nid2str(imp->imp_connection->c_peer.nid),
2102 lustre_msg_get_opc(req->rq_reqmsg));
2104 spin_lock(&imp->imp_lock);
2105 list_del_init(&req->rq_list);
2106 spin_unlock(&imp->imp_lock);
2108 /* If the reply was received normally, this just grabs the spinlock
2109 * (ensuring the reply callback has returned), sees that
2110 * req->rq_receiving_reply is clear and returns. */
2111 ptlrpc_unregister_reply (req);
2115 DEBUG_REQ(D_RPCTRACE, req, "err rc=%d status=%d",
2116 rc, req->rq_status);
2117 GOTO(out, rc = rc ? rc : -EIO);
2121 /* Should only be interrupted if we timed out. */
2122 if (!req->rq_timedout)
2123 DEBUG_REQ(D_ERROR, req,
2124 "rq_intr set but rq_timedout not");
2125 GOTO(out, rc = -EINTR);
2128 /* Resend if we need to */
2129 if (req->rq_resend) {
2130 /* ...unless we were specifically told otherwise. */
2131 if (req->rq_no_resend)
2132 GOTO(out, rc = -ETIMEDOUT);
2133 spin_lock(&imp->imp_lock);
2137 if (req->rq_timedout) { /* non-recoverable timeout */
2138 GOTO(out, rc = -ETIMEDOUT);
2141 if (!req->rq_replied) {
2142 /* How can this be? -eeb */
2143 DEBUG_REQ(D_ERROR, req, "!rq_replied: ");
2145 GOTO(out, rc = req->rq_status);
2148 rc = after_reply(req);
2149 /* NB may return +ve success rc */
2150 if (req->rq_resend) {
2151 spin_lock(&imp->imp_lock);
2156 if (req->rq_bulk != NULL) {
2158 /* success so far. Note that anything going wrong
2159 * with bulk now, is EXTREMELY strange, since the
2160 * server must have believed that the bulk
2161 * tranferred OK before she replied with success to
2163 lwi = LWI_TIMEOUT(timeout, NULL, NULL);
2164 brc = l_wait_event(req->rq_reply_waitq,
2165 !ptlrpc_bulk_active(req->rq_bulk),
2167 LASSERT(brc == 0 || brc == -ETIMEDOUT);
2169 LASSERT(brc == -ETIMEDOUT);
2170 DEBUG_REQ(D_ERROR, req, "bulk timed out");
2172 } else if (!req->rq_bulk->bd_success) {
2173 DEBUG_REQ(D_ERROR, req, "bulk transfer failed");
2178 ptlrpc_unregister_bulk (req);
2181 LASSERT(!req->rq_receiving_reply);
2182 req->rq_phase = RQ_PHASE_INTERPRET;
2184 atomic_dec(&imp->imp_inflight);
2185 cfs_waitq_signal(&imp->imp_recovery_waitq);
2189 struct ptlrpc_replay_async_args {
2191 int praa_old_status;
2194 static int ptlrpc_replay_interpret(const struct lu_env *env,
2195 struct ptlrpc_request *req,
2196 void * data, int rc)
2198 struct ptlrpc_replay_async_args *aa = data;
2199 struct obd_import *imp = req->rq_import;
2202 atomic_dec(&imp->imp_replay_inflight);
2204 if (!req->rq_replied) {
2205 CERROR("request replay timed out, restarting recovery\n");
2206 GOTO(out, rc = -ETIMEDOUT);
2209 if (lustre_msg_get_type(req->rq_repmsg) == PTL_RPC_MSG_ERR &&
2210 (lustre_msg_get_status(req->rq_repmsg) == -ENOTCONN ||
2211 lustre_msg_get_status(req->rq_repmsg) == -ENODEV))
2212 GOTO(out, rc = lustre_msg_get_status(req->rq_repmsg));
2214 /* The transno had better not change over replay. */
2215 LASSERT(lustre_msg_get_transno(req->rq_reqmsg) ==
2216 lustre_msg_get_transno(req->rq_repmsg));
2218 DEBUG_REQ(D_HA, req, "got rep");
2220 /* let the callback do fixups, possibly including in the request */
2221 if (req->rq_replay_cb)
2222 req->rq_replay_cb(req);
2224 if (req->rq_replied &&
2225 lustre_msg_get_status(req->rq_repmsg) != aa->praa_old_status) {
2226 DEBUG_REQ(D_ERROR, req, "status %d, old was %d",
2227 lustre_msg_get_status(req->rq_repmsg),
2228 aa->praa_old_status);
2230 /* Put it back for re-replay. */
2231 lustre_msg_set_status(req->rq_repmsg, aa->praa_old_status);
2235 * Errors while replay can set transno to 0, but
2236 * imp_last_replay_transno shouldn't be set to 0 anyway
2238 if (req->rq_transno > 0) {
2239 spin_lock(&imp->imp_lock);
2240 LASSERT(req->rq_transno <= imp->imp_last_replay_transno);
2241 imp->imp_last_replay_transno = req->rq_transno;
2242 spin_unlock(&imp->imp_lock);
2244 CERROR("Transno is 0 during replay!\n");
2245 /* continue with recovery */
2246 rc = ptlrpc_import_recovery_state_machine(imp);
2248 req->rq_send_state = aa->praa_old_state;
2251 /* this replay failed, so restart recovery */
2252 ptlrpc_connect_import(imp, NULL);
2257 int ptlrpc_replay_req(struct ptlrpc_request *req)
2259 struct ptlrpc_replay_async_args *aa;
2262 LASSERT(req->rq_import->imp_state == LUSTRE_IMP_REPLAY);
2263 /* Not handling automatic bulk replay yet (or ever?) */
2264 LASSERT(req->rq_bulk == NULL);
2266 LASSERT (sizeof (*aa) <= sizeof (req->rq_async_args));
2267 aa = ptlrpc_req_async_args(req);
2268 memset(aa, 0, sizeof *aa);
2270 /* Prepare request to be resent with ptlrpcd */
2271 aa->praa_old_state = req->rq_send_state;
2272 req->rq_send_state = LUSTRE_IMP_REPLAY;
2273 req->rq_phase = RQ_PHASE_NEW;
2275 aa->praa_old_status = lustre_msg_get_status(req->rq_repmsg);
2277 req->rq_interpret_reply = ptlrpc_replay_interpret;
2278 /* Readjust the timeout for current conditions */
2279 ptlrpc_at_set_req_timeout(req);
2281 DEBUG_REQ(D_HA, req, "REPLAY");
2283 atomic_inc(&req->rq_import->imp_replay_inflight);
2284 ptlrpc_request_addref(req); /* ptlrpcd needs a ref */
2286 ptlrpcd_add_req(req);
2290 void ptlrpc_abort_inflight(struct obd_import *imp)
2292 struct list_head *tmp, *n;
2295 /* Make sure that no new requests get processed for this import.
2296 * ptlrpc_{queue,set}_wait must (and does) hold imp_lock while testing
2297 * this flag and then putting requests on sending_list or delayed_list.
2299 spin_lock(&imp->imp_lock);
2301 /* XXX locking? Maybe we should remove each request with the list
2302 * locked? Also, how do we know if the requests on the list are
2303 * being freed at this time?
2305 list_for_each_safe(tmp, n, &imp->imp_sending_list) {
2306 struct ptlrpc_request *req =
2307 list_entry(tmp, struct ptlrpc_request, rq_list);
2309 DEBUG_REQ(D_RPCTRACE, req, "inflight");
2311 spin_lock (&req->rq_lock);
2312 if (req->rq_import_generation < imp->imp_generation) {
2314 req->rq_status = -EINTR;
2315 ptlrpc_wake_client_req(req);
2317 spin_unlock (&req->rq_lock);
2320 list_for_each_safe(tmp, n, &imp->imp_delayed_list) {
2321 struct ptlrpc_request *req =
2322 list_entry(tmp, struct ptlrpc_request, rq_list);
2324 DEBUG_REQ(D_RPCTRACE, req, "aborting waiting req");
2326 spin_lock (&req->rq_lock);
2327 if (req->rq_import_generation < imp->imp_generation) {
2329 req->rq_status = -EINTR;
2330 ptlrpc_wake_client_req(req);
2332 spin_unlock (&req->rq_lock);
2335 /* Last chance to free reqs left on the replay list, but we
2336 * will still leak reqs that haven't committed. */
2337 if (imp->imp_replayable)
2338 ptlrpc_free_committed(imp);
2340 spin_unlock(&imp->imp_lock);
2345 void ptlrpc_abort_set(struct ptlrpc_request_set *set)
2347 struct list_head *tmp, *n;
2349 LASSERT(set != NULL);
2351 list_for_each_safe(tmp, n, &set->set_requests) {
2352 struct ptlrpc_request *req =
2353 list_entry(tmp, struct ptlrpc_request, rq_set_chain);
2355 spin_lock (&req->rq_lock);
2356 if (req->rq_phase != RQ_PHASE_RPC) {
2357 spin_unlock (&req->rq_lock);
2362 req->rq_status = -EINTR;
2363 ptlrpc_wake_client_req(req);
2364 spin_unlock (&req->rq_lock);
2368 static __u64 ptlrpc_last_xid;
2369 static spinlock_t ptlrpc_last_xid_lock;
2371 /* Initialize the XID for the node. This is common among all requests on
2372 * this node, and only requires the property that it is monotonically
2373 * increasing. It does not need to be sequential. Since this is also used
2374 * as the RDMA match bits, it is important that a single client NOT have
2375 * the same match bits for two different in-flight requests, hence we do
2376 * NOT want to have an XID per target or similar.
2378 * To avoid an unlikely collision between match bits after a client reboot
2379 * (which would cause old to be delivered into the wrong buffer) we initialize
2380 * the XID based on the current time, assuming a maximum RPC rate of 1M RPC/s.
2381 * If the time is clearly incorrect, we instead use a 62-bit random number.
2382 * In the worst case the random number will overflow 1M RPCs per second in
2383 * 9133 years, or permutations thereof.
2385 #define YEAR_2004 (1ULL << 30)
2386 void ptlrpc_init_xid(void)
2388 time_t now = cfs_time_current_sec();
2390 spin_lock_init(&ptlrpc_last_xid_lock);
2391 if (now < YEAR_2004) {
2392 ll_get_random_bytes(&ptlrpc_last_xid, sizeof(ptlrpc_last_xid));
2393 ptlrpc_last_xid >>= 2;
2394 ptlrpc_last_xid |= (1ULL << 61);
2396 ptlrpc_last_xid = (now << 20);
2400 __u64 ptlrpc_next_xid(void)
2403 spin_lock(&ptlrpc_last_xid_lock);
2404 tmp = ++ptlrpc_last_xid;
2405 spin_unlock(&ptlrpc_last_xid_lock);
2409 __u64 ptlrpc_sample_next_xid(void)
2411 #if BITS_PER_LONG == 32
2412 /* need to avoid possible word tearing on 32-bit systems */
2414 spin_lock(&ptlrpc_last_xid_lock);
2415 tmp = ptlrpc_last_xid + 1;
2416 spin_unlock(&ptlrpc_last_xid_lock);
2419 /* No need to lock, since returned value is racy anyways */
2420 return ptlrpc_last_xid + 1;
2423 EXPORT_SYMBOL(ptlrpc_sample_next_xid);