1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
4 * Copyright (c) 2002, 2003 Cluster File Systems, Inc.
6 * This file is part of Lustre, http://www.lustre.org.
8 * Lustre is free software; you can redistribute it and/or
9 * modify it under the terms of version 2 of the GNU General Public
10 * License as published by the Free Software Foundation.
12 * Lustre is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with Lustre; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 #define DEBUG_SUBSYSTEM S_RPC
27 #include <liblustre.h>
30 #include <linux/obd_support.h>
31 #include <linux/obd_class.h>
32 #include <linux/lustre_lib.h>
33 #include <linux/lustre_ha.h>
34 #include <linux/lustre_import.h>
36 #include "ptlrpc_internal.h"
38 void ptlrpc_init_client(int req_portal, int rep_portal, char *name,
39 struct ptlrpc_client *cl)
41 cl->cli_request_portal = req_portal;
42 cl->cli_reply_portal = rep_portal;
46 struct ptlrpc_connection *ptlrpc_uuid_to_connection(struct obd_uuid *uuid)
48 struct ptlrpc_connection *c;
49 struct ptlrpc_peer peer;
52 err = ptlrpc_uuid_to_peer(uuid, &peer);
54 CERROR("cannot find peer %s!\n", uuid->uuid);
58 c = ptlrpc_get_connection(&peer, uuid);
60 memcpy(c->c_remote_uuid.uuid,
61 uuid->uuid, sizeof(c->c_remote_uuid.uuid));
64 CDEBUG(D_INFO, "%s -> %p\n", uuid->uuid, c);
69 void ptlrpc_readdress_connection(struct ptlrpc_connection *conn,
70 struct obd_uuid *uuid)
72 struct ptlrpc_peer peer;
75 err = ptlrpc_uuid_to_peer(uuid, &peer);
77 CERROR("cannot find peer %s!\n", uuid->uuid);
81 memcpy(&conn->c_peer, &peer, sizeof (peer));
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 init_waitqueue_head(&desc->bd_waitq);
95 desc->bd_max_pages = npages;
96 desc->bd_page_count = 0;
97 desc->bd_md_h = PTL_HANDLE_NONE;
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;
110 LASSERT(type == BULK_PUT_SINK || type == BULK_GET_SOURCE);
111 desc = new_bulk(npages, type, portal);
115 desc->bd_import_generation = req->rq_import_generation;
116 desc->bd_import = class_import_get(imp);
119 desc->bd_cbid.cbid_fn = client_bulk_callback;
120 desc->bd_cbid.cbid_arg = desc;
122 /* This makes req own desc, and free it when she frees herself */
128 struct ptlrpc_bulk_desc *ptlrpc_prep_bulk_exp (struct ptlrpc_request *req,
129 int npages, int type, int portal)
131 struct obd_export *exp = req->rq_export;
132 struct ptlrpc_bulk_desc *desc;
134 LASSERT(type == BULK_PUT_SOURCE || type == BULK_GET_SINK);
136 desc = new_bulk(npages, type, portal);
140 desc->bd_export = class_export_get(exp);
143 desc->bd_cbid.cbid_fn = server_bulk_callback;
144 desc->bd_cbid.cbid_arg = desc;
146 /* NB we don't assign rq_bulk here; server-side requests are
147 * re-used, and the handler frees the bulk desc explicitly. */
152 void ptlrpc_prep_bulk_page(struct ptlrpc_bulk_desc *desc,
153 struct page *page, int pageoffset, int len)
156 ptl_kiov_t *kiov = &desc->bd_iov[desc->bd_page_count];
158 struct iovec *iov = &desc->bd_iov[desc->bd_page_count];
160 LASSERT(desc->bd_page_count < desc->bd_max_pages);
161 LASSERT(page != NULL);
162 LASSERT(pageoffset >= 0);
164 LASSERT(pageoffset + len <= PAGE_SIZE);
167 kiov->kiov_page = page;
168 kiov->kiov_offset = pageoffset;
169 kiov->kiov_len = len;
171 iov->iov_base = page->addr + pageoffset;
174 desc->bd_page_count++;
178 void ptlrpc_free_bulk(struct ptlrpc_bulk_desc *desc)
182 LASSERT(desc != NULL);
183 LASSERT(desc->bd_page_count != 0x5a5a5a5a); /* not freed already */
184 LASSERT(!desc->bd_network_rw); /* network hands off or */
185 LASSERT((desc->bd_export != NULL) ^ (desc->bd_import != NULL));
187 class_export_put(desc->bd_export);
189 class_import_put(desc->bd_import);
191 OBD_FREE(desc, offsetof(struct ptlrpc_bulk_desc,
192 bd_iov[desc->bd_max_pages]));
196 struct ptlrpc_request *ptlrpc_prep_req(struct obd_import *imp, int opcode,
197 int count, int *lengths, char **bufs)
199 struct ptlrpc_request *request;
203 LASSERT((unsigned long)imp > 0x1000);
205 OBD_ALLOC(request, sizeof(*request));
207 CERROR("request allocation out of memory\n");
211 rc = lustre_pack_request(request, count, lengths, bufs);
213 CERROR("cannot pack request %d\n", rc);
214 OBD_FREE(request, sizeof(*request));
218 if (imp->imp_server_timeout)
219 request->rq_timeout = obd_timeout / 2;
221 request->rq_timeout = obd_timeout;
222 request->rq_send_state = LUSTRE_IMP_FULL;
223 request->rq_type = PTL_RPC_MSG_REQUEST;
224 request->rq_import = class_import_get(imp);
226 request->rq_req_cbid.cbid_fn = request_out_callback;
227 request->rq_req_cbid.cbid_arg = request;
229 request->rq_reply_cbid.cbid_fn = reply_in_callback;
230 request->rq_reply_cbid.cbid_arg = request;
232 request->rq_phase = RQ_PHASE_NEW;
234 /* XXX FIXME bug 249 */
235 request->rq_request_portal = imp->imp_client->cli_request_portal;
236 request->rq_reply_portal = imp->imp_client->cli_reply_portal;
238 spin_lock_init(&request->rq_lock);
239 INIT_LIST_HEAD(&request->rq_list);
240 INIT_LIST_HEAD(&request->rq_replay_list);
241 INIT_LIST_HEAD(&request->rq_set_chain);
242 init_waitqueue_head(&request->rq_reply_waitq);
243 request->rq_xid = ptlrpc_next_xid();
244 atomic_set(&request->rq_refcount, 1);
246 request->rq_reqmsg->opc = opcode;
247 request->rq_reqmsg->flags = 0;
252 struct ptlrpc_request_set *ptlrpc_prep_set(void)
254 struct ptlrpc_request_set *set;
256 OBD_ALLOC(set, sizeof *set);
259 INIT_LIST_HEAD(&set->set_requests);
260 init_waitqueue_head(&set->set_waitq);
261 set->set_remaining = 0;
262 spin_lock_init(&set->set_new_req_lock);
263 INIT_LIST_HEAD(&set->set_new_requests);
268 /* Finish with this set; opposite of prep_set. */
269 void ptlrpc_set_destroy(struct ptlrpc_request_set *set)
271 struct list_head *tmp;
272 struct list_head *next;
277 /* Requests on the set should either all be completed, or all be new */
278 expected_phase = (set->set_remaining == 0) ?
279 RQ_PHASE_COMPLETE : RQ_PHASE_NEW;
280 list_for_each (tmp, &set->set_requests) {
281 struct ptlrpc_request *req =
282 list_entry(tmp, struct ptlrpc_request, rq_set_chain);
284 LASSERT(req->rq_phase == expected_phase);
288 LASSERT(set->set_remaining == 0 || set->set_remaining == n);
290 list_for_each_safe(tmp, next, &set->set_requests) {
291 struct ptlrpc_request *req =
292 list_entry(tmp, struct ptlrpc_request, rq_set_chain);
293 list_del_init(&req->rq_set_chain);
295 LASSERT(req->rq_phase == expected_phase);
297 if (req->rq_phase == RQ_PHASE_NEW) {
299 if (req->rq_interpret_reply != NULL) {
300 int (*interpreter)(struct ptlrpc_request *,
302 req->rq_interpret_reply;
304 /* higher level (i.e. LOV) failed;
305 * let the sub reqs clean up */
306 req->rq_status = -EBADR;
307 interpreter(req, &req->rq_async_args,
310 set->set_remaining--;
314 ptlrpc_req_finished (req);
317 LASSERT(set->set_remaining == 0);
319 OBD_FREE(set, sizeof(*set));
323 void ptlrpc_set_add_req(struct ptlrpc_request_set *set,
324 struct ptlrpc_request *req)
326 /* The set takes over the caller's request reference */
327 list_add_tail(&req->rq_set_chain, &set->set_requests);
329 set->set_remaining++;
332 /* lock so many callers can add things, the context that owns the set
333 * is supposed to notice these and move them into the set proper. */
334 void ptlrpc_set_add_new_req(struct ptlrpc_request_set *set,
335 struct ptlrpc_request *req)
338 spin_lock_irqsave(&set->set_new_req_lock, flags);
339 /* The set takes over the caller's request reference */
340 list_add_tail(&req->rq_set_chain, &set->set_new_requests);
342 spin_unlock_irqrestore(&set->set_new_req_lock, flags);
346 * Based on the current state of the import, determine if the request
347 * can be sent, is an error, or should be delayed.
349 * Returns true if this request should be delayed. If false, and
350 * *status is set, then the request can not be sent and *status is the
351 * error code. If false and status is 0, then request can be sent.
353 * The imp->imp_lock must be held.
355 static int ptlrpc_import_delay_req(struct obd_import *imp,
356 struct ptlrpc_request *req, int *status)
361 LASSERT (status != NULL);
364 if (imp->imp_state == LUSTRE_IMP_NEW) {
365 DEBUG_REQ(D_ERROR, req, "Uninitialized import.");
369 else if (imp->imp_state == LUSTRE_IMP_CLOSED) {
370 DEBUG_REQ(D_ERROR, req, "IMP_CLOSED ");
374 * If the import has been invalidated (such as by an OST failure), the
375 * request must fail with -EIO.
377 else if (imp->imp_invalid) {
378 DEBUG_REQ(D_ERROR, req, "IMP_INVALID");
381 else if (req->rq_import_generation != imp->imp_generation) {
382 DEBUG_REQ(D_ERROR, req, "req wrong generation:");
385 else if (req->rq_send_state != imp->imp_state) {
386 if (imp->imp_obd->obd_no_recov || imp->imp_dlm_fake)
387 *status = -EWOULDBLOCK;
395 static int ptlrpc_check_reply(struct ptlrpc_request *req)
401 /* serialise with network callback */
402 spin_lock_irqsave (&req->rq_lock, flags);
404 if (req->rq_replied) {
405 DEBUG_REQ(D_NET, req, "REPLIED:");
410 DEBUG_REQ(D_ERROR, req, "ABORTED:");
414 if (req->rq_resend) {
415 DEBUG_REQ(D_ERROR, req, "RESEND:");
419 if (req->rq_restart) {
420 DEBUG_REQ(D_ERROR, req, "RESTART:");
425 spin_unlock_irqrestore (&req->rq_lock, flags);
426 DEBUG_REQ(D_NET, req, "rc = %d for", rc);
430 static int ptlrpc_check_status(struct ptlrpc_request *req)
435 err = req->rq_repmsg->status;
436 if (req->rq_repmsg->type == PTL_RPC_MSG_ERR) {
437 DEBUG_REQ(D_ERROR, req, "type == PTL_RPC_MSG_ERR, err == %d",
439 RETURN(err < 0 ? err : -EINVAL);
443 DEBUG_REQ(D_INFO, req, "status is %d", err);
444 } else if (err > 0) {
445 /* XXX: translate this error from net to host */
446 DEBUG_REQ(D_INFO, req, "status is %d", err);
452 static int after_reply(struct ptlrpc_request *req)
455 struct obd_import *imp = req->rq_import;
459 LASSERT(!req->rq_receiving_reply);
461 /* NB Until this point, the whole of the incoming message,
462 * including buflens, status etc is in the sender's byte order. */
465 /* Clear reply swab mask; this is a new reply in sender's byte order */
466 req->rq_rep_swab_mask = 0;
468 LASSERT (req->rq_nob_received <= req->rq_replen);
469 rc = lustre_unpack_msg(req->rq_repmsg, req->rq_nob_received);
471 CERROR("unpack_rep failed: %d\n", rc);
475 if (req->rq_repmsg->type != PTL_RPC_MSG_REPLY &&
476 req->rq_repmsg->type != PTL_RPC_MSG_ERR) {
477 CERROR("invalid packet type received (type=%u)\n",
478 req->rq_repmsg->type);
482 /* Store transno in reqmsg for replay. */
483 req->rq_reqmsg->transno = req->rq_transno = req->rq_repmsg->transno;
485 rc = ptlrpc_check_status(req);
487 /* Either we've been evicted, or the server has failed for
488 * some reason. Try to reconnect, and if that fails, punt to the
490 if (rc == -ENOTCONN) {
491 if (req->rq_send_state != LUSTRE_IMP_FULL ||
492 imp->imp_obd->obd_no_recov || imp->imp_dlm_fake) {
496 ptlrpc_request_handle_notconn(req);
501 if (req->rq_import->imp_replayable) {
502 spin_lock_irqsave(&imp->imp_lock, flags);
503 if (req->rq_replay || req->rq_transno != 0)
504 ptlrpc_retain_replayable_request(req, imp);
505 else if (req->rq_commit_cb != NULL)
506 req->rq_commit_cb(req);
508 if (req->rq_transno > imp->imp_max_transno)
509 imp->imp_max_transno = req->rq_transno;
511 /* Replay-enabled imports return commit-status information. */
512 if (req->rq_repmsg->last_committed)
513 imp->imp_peer_committed_transno =
514 req->rq_repmsg->last_committed;
515 ptlrpc_free_committed(imp);
516 spin_unlock_irqrestore(&imp->imp_lock, flags);
522 static int ptlrpc_send_new_req(struct ptlrpc_request *req)
524 struct obd_import *imp;
529 LASSERT(req->rq_phase == RQ_PHASE_NEW);
530 req->rq_phase = RQ_PHASE_RPC;
532 imp = req->rq_import;
533 spin_lock_irqsave(&imp->imp_lock, flags);
535 if (imp->imp_invalid) {
536 spin_unlock_irqrestore(&imp->imp_lock, flags);
537 req->rq_status = -EIO;
538 req->rq_phase = RQ_PHASE_INTERPRET;
542 req->rq_import_generation = imp->imp_generation;
544 if (ptlrpc_import_delay_req(imp, req, &rc)) {
545 spin_lock (&req->rq_lock);
547 spin_unlock (&req->rq_lock);
549 LASSERT(list_empty (&req->rq_list));
551 // list_del(&req->rq_list);
552 list_add_tail(&req->rq_list, &imp->imp_delayed_list);
553 spin_unlock_irqrestore(&imp->imp_lock, flags);
558 spin_unlock_irqrestore(&imp->imp_lock, flags);
560 req->rq_phase = RQ_PHASE_INTERPRET;
564 /* XXX this is the same as ptlrpc_queue_wait */
565 LASSERT(list_empty(&req->rq_list));
566 list_add_tail(&req->rq_list, &imp->imp_sending_list);
567 spin_unlock_irqrestore(&imp->imp_lock, flags);
569 req->rq_reqmsg->status = current->pid;
570 CDEBUG(D_RPCTRACE, "Sending RPC pname:cluuid:pid:xid:ni:nid:opc"
571 " %s:%s:%d:"LPU64":%s:"LPX64":%d\n", current->comm,
572 imp->imp_obd->obd_uuid.uuid, req->rq_reqmsg->status,
574 imp->imp_connection->c_peer.peer_ni->pni_name,
575 imp->imp_connection->c_peer.peer_nid,
576 req->rq_reqmsg->opc);
578 rc = ptl_send_rpc(req);
580 DEBUG_REQ(D_HA, req, "send failed (%d); expect timeout", rc);
587 int ptlrpc_check_set(struct ptlrpc_request_set *set)
590 struct list_head *tmp;
591 int force_timer_recalc = 0;
594 if (set->set_remaining == 0)
597 list_for_each(tmp, &set->set_requests) {
598 struct ptlrpc_request *req =
599 list_entry(tmp, struct ptlrpc_request, rq_set_chain);
600 struct obd_import *imp = req->rq_import;
603 if (req->rq_phase == RQ_PHASE_NEW &&
604 ptlrpc_send_new_req(req)) {
605 force_timer_recalc = 1;
608 if (!(req->rq_phase == RQ_PHASE_RPC ||
609 req->rq_phase == RQ_PHASE_BULK ||
610 req->rq_phase == RQ_PHASE_INTERPRET ||
611 req->rq_phase == RQ_PHASE_COMPLETE)) {
612 DEBUG_REQ(D_ERROR, req, "bad phase %x", req->rq_phase);
616 if (req->rq_phase == RQ_PHASE_COMPLETE)
619 if (req->rq_phase == RQ_PHASE_INTERPRET)
620 GOTO(interpret, req->rq_status);
623 ptlrpc_unregister_reply(req);
624 if (req->rq_status == 0)
625 req->rq_status = -EIO;
626 req->rq_phase = RQ_PHASE_INTERPRET;
628 spin_lock_irqsave(&imp->imp_lock, flags);
629 list_del_init(&req->rq_list);
630 spin_unlock_irqrestore(&imp->imp_lock, flags);
632 GOTO(interpret, req->rq_status);
635 /* ptlrpc_queue_wait->l_wait_event guarantees that rq_intr
636 * will only be set after rq_timedout, but the oig waiting
637 * path sets rq_intr irrespective of whether ptlrpcd has
638 * seen a timeout. our policy is to only interpret
639 * interrupted rpcs after they have timed out */
640 if (req->rq_intr && (req->rq_timedout || req->rq_waiting)) {
641 /* NB could be on delayed list */
642 ptlrpc_unregister_reply(req);
643 req->rq_status = -EINTR;
644 req->rq_phase = RQ_PHASE_INTERPRET;
646 spin_lock_irqsave(&imp->imp_lock, flags);
647 list_del_init(&req->rq_list);
648 spin_unlock_irqrestore(&imp->imp_lock, flags);
650 GOTO(interpret, req->rq_status);
653 if (req->rq_phase == RQ_PHASE_RPC) {
654 if (req->rq_waiting || req->rq_resend) {
657 LASSERT (!ptlrpc_client_receiving_reply(req));
658 LASSERT (req->rq_bulk == NULL ||
659 !ptlrpc_bulk_active(req->rq_bulk));
661 spin_lock_irqsave(&imp->imp_lock, flags);
663 if (ptlrpc_import_delay_req(imp, req, &status)) {
664 spin_unlock_irqrestore(&imp->imp_lock,
669 list_del_init(&req->rq_list);
671 req->rq_status = status;
672 req->rq_phase = RQ_PHASE_INTERPRET;
673 spin_unlock_irqrestore(&imp->imp_lock,
675 GOTO(interpret, req->rq_status);
677 if (req->rq_no_resend) {
678 req->rq_status = -ENOTCONN;
679 req->rq_phase = RQ_PHASE_INTERPRET;
680 spin_unlock_irqrestore(&imp->imp_lock,
682 GOTO(interpret, req->rq_status);
684 list_add_tail(&req->rq_list,
685 &imp->imp_sending_list);
687 spin_unlock_irqrestore(&imp->imp_lock, flags);
690 if (req->rq_resend) {
691 lustre_msg_add_flags(req->rq_reqmsg,
693 ptlrpc_unregister_reply(req);
695 __u64 old_xid = req->rq_xid;
697 /* ensure previous bulk fails */
698 req->rq_xid = ptlrpc_next_xid();
699 CDEBUG(D_HA, "resend bulk "
702 old_xid, req->rq_xid);
706 rc = ptl_send_rpc(req);
708 DEBUG_REQ(D_HA, req, "send failed (%d)",
710 force_timer_recalc = 1;
713 /* need to reset the timeout */
714 force_timer_recalc = 1;
717 /* Still waiting for a reply? */
718 if (ptlrpc_client_receiving_reply(req))
721 /* Did we actually receive a reply? */
722 if (!ptlrpc_client_replied(req))
725 spin_lock_irqsave(&imp->imp_lock, flags);
726 list_del_init(&req->rq_list);
727 spin_unlock_irqrestore(&imp->imp_lock, flags);
729 req->rq_status = after_reply(req);
730 if (req->rq_resend) {
731 /* Add this req to the delayed list so
732 it can be errored if the import is
733 evicted after recovery. */
734 spin_lock_irqsave (&req->rq_lock, flags);
735 list_add_tail(&req->rq_list,
736 &imp->imp_delayed_list);
737 spin_unlock_irqrestore(&req->rq_lock, flags);
741 /* If there is no bulk associated with this request,
742 * then we're done and should let the interpreter
743 * process the reply. Similarly if the RPC returned
744 * an error, and therefore the bulk will never arrive.
746 if (req->rq_bulk == NULL || req->rq_status != 0) {
747 req->rq_phase = RQ_PHASE_INTERPRET;
748 GOTO(interpret, req->rq_status);
751 req->rq_phase = RQ_PHASE_BULK;
754 LASSERT(req->rq_phase == RQ_PHASE_BULK);
755 if (ptlrpc_bulk_active(req->rq_bulk))
758 if (!req->rq_bulk->bd_success) {
759 /* The RPC reply arrived OK, but the bulk screwed
760 * up! Dead wierd since the server told us the RPC
761 * was good after getting the REPLY for her GET or
762 * the ACK for her PUT. */
763 DEBUG_REQ(D_ERROR, req, "bulk transfer failed");
767 req->rq_phase = RQ_PHASE_INTERPRET;
770 LASSERT(req->rq_phase == RQ_PHASE_INTERPRET);
771 LASSERT(!req->rq_receiving_reply);
773 ptlrpc_unregister_reply(req);
774 if (req->rq_bulk != NULL)
775 ptlrpc_unregister_bulk (req);
777 req->rq_phase = RQ_PHASE_COMPLETE;
779 if (req->rq_interpret_reply != NULL) {
780 int (*interpreter)(struct ptlrpc_request *,void *,int) =
781 req->rq_interpret_reply;
782 req->rq_status = interpreter(req, &req->rq_async_args,
786 CDEBUG(D_RPCTRACE, "Completed RPC pname:cluuid:pid:xid:ni:nid:"
787 "opc %s:%s:%d:"LPU64":%s:"LPX64":%d\n", current->comm,
788 imp->imp_obd->obd_uuid.uuid, req->rq_reqmsg->status,
790 imp->imp_connection->c_peer.peer_ni->pni_name,
791 imp->imp_connection->c_peer.peer_nid,
792 req->rq_reqmsg->opc);
794 set->set_remaining--;
797 /* If we hit an error, we want to recover promptly. */
798 RETURN(set->set_remaining == 0 || force_timer_recalc);
801 int ptlrpc_expire_one_request(struct ptlrpc_request *req)
804 struct obd_import *imp = req->rq_import;
807 DEBUG_REQ(D_ERROR, req, "timeout");
809 spin_lock_irqsave (&req->rq_lock, flags);
810 req->rq_timedout = 1;
811 spin_unlock_irqrestore (&req->rq_lock, flags);
813 ptlrpc_unregister_reply (req);
815 if (req->rq_bulk != NULL)
816 ptlrpc_unregister_bulk (req);
819 DEBUG_REQ(D_HA, req, "NULL import: already cleaned up?");
823 /* The DLM server doesn't want recovery run on its imports. */
824 if (imp->imp_dlm_fake)
827 /* If this request is for recovery or other primordial tasks,
828 * then error it out here. */
829 if (req->rq_send_state != LUSTRE_IMP_FULL ||
830 imp->imp_obd->obd_no_recov) {
831 spin_lock_irqsave (&req->rq_lock, flags);
832 req->rq_status = -ETIMEDOUT;
834 spin_unlock_irqrestore (&req->rq_lock, flags);
838 ptlrpc_fail_import(imp, req->rq_import_generation);
843 int ptlrpc_expired_set(void *data)
845 struct ptlrpc_request_set *set = data;
846 struct list_head *tmp;
847 time_t now = LTIME_S (CURRENT_TIME);
850 LASSERT(set != NULL);
852 /* A timeout expired; see which reqs it applies to... */
853 list_for_each (tmp, &set->set_requests) {
854 struct ptlrpc_request *req =
855 list_entry(tmp, struct ptlrpc_request, rq_set_chain);
857 /* request in-flight? */
858 if (!((req->rq_phase == RQ_PHASE_RPC && !req->rq_waiting
859 && !req->rq_resend) ||
860 (req->rq_phase == RQ_PHASE_BULK)))
863 if (req->rq_timedout || /* already dealt with */
864 req->rq_sent + req->rq_timeout > now) /* not expired */
867 /* deal with this guy */
868 ptlrpc_expire_one_request (req);
871 /* When waiting for a whole set, we always to break out of the
872 * sleep so we can recalculate the timeout, or enable interrupts
873 * iff everyone's timed out.
878 void ptlrpc_mark_interrupted(struct ptlrpc_request *req)
881 spin_lock_irqsave(&req->rq_lock, flags);
883 spin_unlock_irqrestore(&req->rq_lock, flags);
886 void ptlrpc_interrupted_set(void *data)
888 struct ptlrpc_request_set *set = data;
889 struct list_head *tmp;
891 LASSERT(set != NULL);
892 CERROR("INTERRUPTED SET %p\n", set);
894 list_for_each(tmp, &set->set_requests) {
895 struct ptlrpc_request *req =
896 list_entry(tmp, struct ptlrpc_request, rq_set_chain);
898 if (req->rq_phase != RQ_PHASE_RPC)
901 ptlrpc_mark_interrupted(req);
905 int ptlrpc_set_next_timeout(struct ptlrpc_request_set *set)
907 struct list_head *tmp;
908 time_t now = LTIME_S(CURRENT_TIME);
911 struct ptlrpc_request *req;
914 SIGNAL_MASK_ASSERT(); /* XXX BUG 1511 */
916 list_for_each(tmp, &set->set_requests) {
917 req = list_entry(tmp, struct ptlrpc_request, rq_set_chain);
919 /* request in-flight? */
920 if (!((req->rq_phase == RQ_PHASE_RPC && !req->rq_waiting) ||
921 (req->rq_phase == RQ_PHASE_BULK)))
924 if (req->rq_timedout) /* already timed out */
927 deadline = req->rq_sent + req->rq_timeout;
928 if (deadline <= now) /* actually expired already */
929 timeout = 1; /* ASAP */
930 else if (timeout == 0 || timeout > deadline - now)
931 timeout = deadline - now;
937 int ptlrpc_set_wait(struct ptlrpc_request_set *set)
939 struct list_head *tmp;
940 struct ptlrpc_request *req;
941 struct l_wait_info lwi;
945 LASSERT(!list_empty(&set->set_requests));
946 list_for_each(tmp, &set->set_requests) {
947 req = list_entry(tmp, struct ptlrpc_request, rq_set_chain);
948 if (req->rq_phase == RQ_PHASE_NEW)
949 (void)ptlrpc_send_new_req(req);
953 timeout = ptlrpc_set_next_timeout(set);
955 /* wait until all complete, interrupted, or an in-flight
957 CDEBUG(D_HA, "set %p going to sleep for %d seconds\n",
959 lwi = LWI_TIMEOUT_INTR((timeout ? timeout : 1) * HZ,
961 ptlrpc_interrupted_set, set);
962 rc = l_wait_event(set->set_waitq, ptlrpc_check_set(set), &lwi);
964 LASSERT(rc == 0 || rc == -EINTR || rc == -ETIMEDOUT);
966 /* -EINTR => all requests have been flagged rq_intr so next
968 * -ETIMEOUTD => someone timed out. When all reqs have
969 * timed out, signals are enabled allowing completion with
971 * I don't really care if we go once more round the loop in
972 * the error cases -eeb. */
975 LASSERT(set->set_remaining == 0);
978 list_for_each(tmp, &set->set_requests) {
979 req = list_entry(tmp, struct ptlrpc_request, rq_set_chain);
981 LASSERT(req->rq_phase == RQ_PHASE_COMPLETE);
982 if (req->rq_status != 0)
986 if (set->set_interpret != NULL) {
987 int (*interpreter)(struct ptlrpc_request_set *set,void *,int) =
989 rc = interpreter (set, &set->set_args, rc);
995 static void __ptlrpc_free_req(struct ptlrpc_request *request, int locked)
998 if (request == NULL) {
1003 LASSERTF(!request->rq_receiving_reply, "req %p\n", request);
1004 LASSERTF(request->rq_rqbd == NULL, "req %p\n",request);/* client-side */
1005 LASSERTF(list_empty(&request->rq_list), "req %p\n", request);
1006 LASSERTF(list_empty(&request->rq_set_chain), "req %p\n", request);
1008 /* We must take it off the imp_replay_list first. Otherwise, we'll set
1009 * request->rq_reqmsg to NULL while osc_close is dereferencing it. */
1010 if (request->rq_import != NULL) {
1011 unsigned long flags = 0;
1013 spin_lock_irqsave(&request->rq_import->imp_lock, flags);
1014 list_del_init(&request->rq_replay_list);
1016 spin_unlock_irqrestore(&request->rq_import->imp_lock,
1019 LASSERTF(list_empty(&request->rq_replay_list), "req %p\n", request);
1021 if (atomic_read(&request->rq_refcount) != 0) {
1022 DEBUG_REQ(D_ERROR, request,
1023 "freeing request with nonzero refcount");
1027 if (request->rq_repmsg != NULL) {
1028 OBD_FREE(request->rq_repmsg, request->rq_replen);
1029 request->rq_repmsg = NULL;
1031 if (request->rq_reqmsg != NULL) {
1032 OBD_FREE(request->rq_reqmsg, request->rq_reqlen);
1033 request->rq_reqmsg = NULL;
1035 if (request->rq_export != NULL) {
1036 class_export_put(request->rq_export);
1037 request->rq_export = NULL;
1039 if (request->rq_import != NULL) {
1040 class_import_put(request->rq_import);
1041 request->rq_import = NULL;
1043 if (request->rq_bulk != NULL)
1044 ptlrpc_free_bulk(request->rq_bulk);
1046 OBD_FREE(request, sizeof(*request));
1050 void ptlrpc_free_req(struct ptlrpc_request *request)
1052 __ptlrpc_free_req(request, 0);
1055 static int __ptlrpc_req_finished(struct ptlrpc_request *request, int locked);
1056 void ptlrpc_req_finished_with_imp_lock(struct ptlrpc_request *request)
1059 LASSERT(spin_is_locked(&request->rq_import->imp_lock));
1061 (void)__ptlrpc_req_finished(request, 1);
1064 static int __ptlrpc_req_finished(struct ptlrpc_request *request, int locked)
1067 if (request == NULL)
1070 if (request == (void *)(unsigned long)(0x5a5a5a5a5a5a5a5a) ||
1071 request->rq_reqmsg == (void *)(unsigned long)(0x5a5a5a5a5a5a5a5a)) {
1072 CERROR("dereferencing freed request (bug 575)\n");
1077 DEBUG_REQ(D_INFO, request, "refcount now %u",
1078 atomic_read(&request->rq_refcount) - 1);
1080 if (atomic_dec_and_test(&request->rq_refcount)) {
1081 __ptlrpc_free_req(request, locked);
1088 void ptlrpc_req_finished(struct ptlrpc_request *request)
1090 __ptlrpc_req_finished(request, 0);
1093 /* Disengage the client's reply buffer from the network
1094 * NB does _NOT_ unregister any client-side bulk.
1095 * IDEMPOTENT, but _not_ safe against concurrent callers.
1096 * The request owner (i.e. the thread doing the I/O) must call...
1098 void ptlrpc_unregister_reply (struct ptlrpc_request *request)
1101 wait_queue_head_t *wq;
1102 struct l_wait_info lwi;
1104 LASSERT(!in_interrupt ()); /* might sleep */
1106 if (!ptlrpc_client_receiving_reply(request))
1109 rc = PtlMDUnlink (request->rq_reply_md_h);
1110 if (rc == PTL_INV_MD) {
1111 LASSERT (!ptlrpc_client_receiving_reply(request));
1115 LASSERT (rc == PTL_OK);
1117 if (request->rq_set == NULL)
1118 wq = &request->rq_set->set_waitq;
1120 wq = &request->rq_reply_waitq;
1123 /* Network access will complete in finite time but the HUGE
1124 * timeout lets us CWARN for visibility of sluggish NALs */
1125 lwi = LWI_TIMEOUT(300 * HZ, NULL, NULL);
1126 rc = l_wait_event (*wq, !ptlrpc_client_receiving_reply(request), &lwi);
1130 LASSERT (rc == -ETIMEDOUT);
1131 DEBUG_REQ(D_WARNING, request, "Unexpectedly long timeout");
1135 /* caller must hold imp->imp_lock */
1136 void ptlrpc_free_committed(struct obd_import *imp)
1138 struct list_head *tmp, *saved;
1139 struct ptlrpc_request *req;
1140 struct ptlrpc_request *last_req = NULL; /* temporary fire escape */
1143 LASSERT(imp != NULL);
1146 LASSERT(spin_is_locked(&imp->imp_lock));
1149 CDEBUG(D_HA, "%s: committing for last_committed "LPU64"\n",
1150 imp->imp_obd->obd_name, imp->imp_peer_committed_transno);
1152 list_for_each_safe(tmp, saved, &imp->imp_replay_list) {
1153 req = list_entry(tmp, struct ptlrpc_request, rq_replay_list);
1155 /* XXX ok to remove when 1357 resolved - rread 05/29/03 */
1156 LASSERT(req != last_req);
1159 if (req->rq_import_generation < imp->imp_generation) {
1160 DEBUG_REQ(D_HA, req, "freeing request with old gen");
1164 if (req->rq_replay) {
1165 DEBUG_REQ(D_HA, req, "keeping (FL_REPLAY)");
1169 /* not yet committed */
1170 if (req->rq_transno > imp->imp_peer_committed_transno) {
1171 DEBUG_REQ(D_HA, req, "stopping search");
1175 DEBUG_REQ(D_HA, req, "committing (last_committed "LPU64")",
1176 imp->imp_peer_committed_transno);
1178 if (req->rq_commit_cb != NULL)
1179 req->rq_commit_cb(req);
1180 list_del_init(&req->rq_replay_list);
1181 __ptlrpc_req_finished(req, 1);
1188 void ptlrpc_cleanup_client(struct obd_import *imp)
1195 void ptlrpc_resend_req(struct ptlrpc_request *req)
1197 unsigned long flags;
1199 DEBUG_REQ(D_HA, req, "going to resend");
1200 req->rq_reqmsg->handle.cookie = 0;
1201 req->rq_status = -EAGAIN;
1203 spin_lock_irqsave (&req->rq_lock, flags);
1205 req->rq_timedout = 0;
1207 __u64 old_xid = req->rq_xid;
1209 /* ensure previous bulk fails */
1210 req->rq_xid = ptlrpc_next_xid();
1211 CDEBUG(D_HA, "resend bulk old x"LPU64" new x"LPU64"\n",
1212 old_xid, req->rq_xid);
1214 ptlrpc_wake_client_req(req);
1215 spin_unlock_irqrestore (&req->rq_lock, flags);
1219 /* XXX: this function and rq_status are currently unused */
1220 void ptlrpc_restart_req(struct ptlrpc_request *req)
1222 unsigned long flags;
1224 DEBUG_REQ(D_HA, req, "restarting (possibly-)completed request");
1225 req->rq_status = -ERESTARTSYS;
1227 spin_lock_irqsave (&req->rq_lock, flags);
1228 req->rq_restart = 1;
1229 req->rq_timedout = 0;
1230 ptlrpc_wake_client_req(req);
1231 spin_unlock_irqrestore (&req->rq_lock, flags);
1234 static int expired_request(void *data)
1236 struct ptlrpc_request *req = data;
1239 RETURN(ptlrpc_expire_one_request(req));
1242 static void interrupted_request(void *data)
1244 unsigned long flags;
1246 struct ptlrpc_request *req = data;
1247 DEBUG_REQ(D_HA, req, "request interrupted");
1248 spin_lock_irqsave (&req->rq_lock, flags);
1250 spin_unlock_irqrestore (&req->rq_lock, flags);
1253 struct ptlrpc_request *ptlrpc_request_addref(struct ptlrpc_request *req)
1256 atomic_inc(&req->rq_refcount);
1260 void ptlrpc_retain_replayable_request(struct ptlrpc_request *req,
1261 struct obd_import *imp)
1263 struct list_head *tmp;
1266 LASSERT(spin_is_locked(&imp->imp_lock));
1269 /* don't re-add requests that have been replayed */
1270 if (!list_empty(&req->rq_replay_list))
1273 lustre_msg_add_flags(req->rq_reqmsg,
1276 LASSERT(imp->imp_replayable);
1277 /* Balanced in ptlrpc_free_committed, usually. */
1278 ptlrpc_request_addref(req);
1279 list_for_each_prev(tmp, &imp->imp_replay_list) {
1280 struct ptlrpc_request *iter =
1281 list_entry(tmp, struct ptlrpc_request, rq_replay_list);
1283 /* We may have duplicate transnos if we create and then
1284 * open a file, or for closes retained if to match creating
1285 * opens, so use req->rq_xid as a secondary key.
1286 * (See bugs 684, 685, and 428.)
1287 * XXX no longer needed, but all opens need transnos!
1289 if (iter->rq_transno > req->rq_transno)
1292 if (iter->rq_transno == req->rq_transno) {
1293 LASSERT(iter->rq_xid != req->rq_xid);
1294 if (iter->rq_xid > req->rq_xid)
1298 list_add(&req->rq_replay_list, &iter->rq_replay_list);
1302 list_add_tail(&req->rq_replay_list, &imp->imp_replay_list);
1305 int ptlrpc_queue_wait(struct ptlrpc_request *req)
1309 struct l_wait_info lwi;
1310 struct obd_import *imp = req->rq_import;
1311 unsigned long flags;
1315 LASSERT(req->rq_set == NULL);
1316 LASSERT(!req->rq_receiving_reply);
1318 /* for distributed debugging */
1319 req->rq_reqmsg->status = current->pid;
1320 LASSERT(imp->imp_obd != NULL);
1321 CDEBUG(D_RPCTRACE, "Sending RPC pname:cluuid:pid:xid:ni:nid:opc "
1322 "%s:%s:%d:"LPU64":%s:"LPX64":%d\n", current->comm,
1323 imp->imp_obd->obd_uuid.uuid,
1324 req->rq_reqmsg->status, req->rq_xid,
1325 imp->imp_connection->c_peer.peer_ni->pni_name,
1326 imp->imp_connection->c_peer.peer_nid,
1327 req->rq_reqmsg->opc);
1329 /* Mark phase here for a little debug help */
1330 req->rq_phase = RQ_PHASE_RPC;
1332 spin_lock_irqsave(&imp->imp_lock, flags);
1333 req->rq_import_generation = imp->imp_generation;
1335 if (ptlrpc_import_delay_req(imp, req, &rc)) {
1336 list_del(&req->rq_list);
1338 list_add_tail(&req->rq_list, &imp->imp_delayed_list);
1339 spin_unlock_irqrestore(&imp->imp_lock, flags);
1341 DEBUG_REQ(D_HA, req, "\"%s\" waiting for recovery: (%s != %s)",
1343 ptlrpc_import_state_name(req->rq_send_state),
1344 ptlrpc_import_state_name(imp->imp_state));
1345 lwi = LWI_INTR(interrupted_request, req);
1346 rc = l_wait_event(req->rq_reply_waitq,
1347 (req->rq_send_state == imp->imp_state ||
1350 DEBUG_REQ(D_HA, req, "\"%s\" awake: (%s == %s or %d == 1)",
1352 ptlrpc_import_state_name(imp->imp_state),
1353 ptlrpc_import_state_name(req->rq_send_state),
1356 spin_lock_irqsave(&imp->imp_lock, flags);
1357 list_del_init(&req->rq_list);
1362 else if (req->rq_intr) {
1365 else if (req->rq_no_resend) {
1366 spin_unlock_irqrestore(&imp->imp_lock, flags);
1367 GOTO(out, rc = -ETIMEDOUT);
1375 list_del_init(&req->rq_list);
1376 spin_unlock_irqrestore(&imp->imp_lock, flags);
1377 req->rq_status = rc; // XXX this ok?
1381 if (req->rq_resend) {
1382 lustre_msg_add_flags(req->rq_reqmsg, MSG_RESENT);
1384 if (req->rq_bulk != NULL)
1385 ptlrpc_unregister_bulk (req);
1387 DEBUG_REQ(D_HA, req, "resending: ");
1390 /* XXX this is the same as ptlrpc_set_wait */
1391 LASSERT(list_empty(&req->rq_list));
1392 list_add_tail(&req->rq_list, &imp->imp_sending_list);
1393 spin_unlock_irqrestore(&imp->imp_lock, flags);
1395 rc = ptl_send_rpc(req);
1397 DEBUG_REQ(D_HA, req, "send failed (%d); recovering", rc);
1400 timeout = MAX(req->rq_timeout * HZ, 1);
1401 DEBUG_REQ(D_NET, req, "-- sleeping");
1403 lwi = LWI_TIMEOUT_INTR(timeout, expired_request, interrupted_request,
1405 l_wait_event(req->rq_reply_waitq, ptlrpc_check_reply(req), &lwi);
1406 DEBUG_REQ(D_NET, req, "-- done sleeping");
1408 CDEBUG(D_RPCTRACE, "Completed RPC pname:cluuid:pid:xid:ni:nid:opc "
1409 "%s:%s:%d:"LPU64":%s:"LPX64":%d\n", current->comm,
1410 imp->imp_obd->obd_uuid.uuid,
1411 req->rq_reqmsg->status, req->rq_xid,
1412 imp->imp_connection->c_peer.peer_ni->pni_name,
1413 imp->imp_connection->c_peer.peer_nid,
1414 req->rq_reqmsg->opc);
1416 spin_lock_irqsave(&imp->imp_lock, flags);
1417 list_del_init(&req->rq_list);
1418 spin_unlock_irqrestore(&imp->imp_lock, flags);
1420 /* If the reply was received normally, this just grabs the spinlock
1421 * (ensuring the reply callback has returned), sees that
1422 * req->rq_receiving_reply is clear and returns. */
1423 ptlrpc_unregister_reply (req);
1426 GOTO(out, rc = -EIO);
1428 /* Resend if we need to, unless we were interrupted. */
1429 if (req->rq_resend && !req->rq_intr) {
1430 /* ...unless we were specifically told otherwise. */
1431 if (req->rq_no_resend)
1432 GOTO(out, rc = -ETIMEDOUT);
1433 spin_lock_irqsave(&imp->imp_lock, flags);
1438 /* Should only be interrupted if we timed out. */
1439 if (!req->rq_timedout)
1440 DEBUG_REQ(D_ERROR, req,
1441 "rq_intr set but rq_timedout not");
1442 GOTO(out, rc = -EINTR);
1445 if (req->rq_timedout) { /* non-recoverable timeout */
1446 GOTO(out, rc = -ETIMEDOUT);
1449 if (!req->rq_replied) {
1450 /* How can this be? -eeb */
1451 DEBUG_REQ(D_ERROR, req, "!rq_replied: ");
1453 GOTO(out, rc = req->rq_status);
1456 rc = after_reply (req);
1457 /* NB may return +ve success rc */
1458 if (req->rq_resend) {
1459 spin_lock_irqsave(&imp->imp_lock, flags);
1464 if (req->rq_bulk != NULL) {
1466 /* success so far. Note that anything going wrong
1467 * with bulk now, is EXTREMELY strange, since the
1468 * server must have believed that the bulk
1469 * tranferred OK before she replied with success to
1471 lwi = LWI_TIMEOUT(timeout, NULL, NULL);
1472 brc = l_wait_event(req->rq_reply_waitq,
1473 !ptlrpc_bulk_active(req->rq_bulk),
1475 LASSERT(brc == 0 || brc == -ETIMEDOUT);
1477 LASSERT(brc == -ETIMEDOUT);
1478 DEBUG_REQ(D_ERROR, req, "bulk timed out");
1480 } else if (!req->rq_bulk->bd_success) {
1481 DEBUG_REQ(D_ERROR, req, "bulk transfer failed");
1486 ptlrpc_unregister_bulk (req);
1489 LASSERT(!req->rq_receiving_reply);
1490 req->rq_phase = RQ_PHASE_INTERPRET;
1494 struct ptlrpc_replay_async_args {
1496 int praa_old_status;
1499 static int ptlrpc_replay_interpret(struct ptlrpc_request *req,
1500 void * data, int rc)
1502 struct ptlrpc_replay_async_args *aa = data;
1503 struct obd_import *imp = req->rq_import;
1504 unsigned long flags;
1506 atomic_dec(&imp->imp_replay_inflight);
1508 if (!req->rq_replied) {
1509 CERROR("request replay timed out, restarting recovery\n");
1510 GOTO(out, rc = -ETIMEDOUT);
1514 /* Clear reply swab mask; this is a new reply in sender's byte order */
1515 req->rq_rep_swab_mask = 0;
1517 LASSERT (req->rq_nob_received <= req->rq_replen);
1518 rc = lustre_unpack_msg(req->rq_repmsg, req->rq_nob_received);
1520 CERROR("unpack_rep failed: %d\n", rc);
1521 GOTO(out, rc = -EPROTO);
1524 if (req->rq_repmsg->type == PTL_RPC_MSG_ERR &&
1525 req->rq_repmsg->status == -ENOTCONN)
1526 GOTO(out, rc = req->rq_repmsg->status);
1528 /* The transno had better not change over replay. */
1529 LASSERT(req->rq_reqmsg->transno == req->rq_repmsg->transno);
1531 DEBUG_REQ(D_HA, req, "got rep");
1533 /* let the callback do fixups, possibly including in the request */
1534 if (req->rq_replay_cb)
1535 req->rq_replay_cb(req);
1537 if (req->rq_replied && req->rq_repmsg->status != aa->praa_old_status) {
1538 DEBUG_REQ(D_ERROR, req, "status %d, old was %d",
1539 req->rq_repmsg->status, aa->praa_old_status);
1541 /* Put it back for re-replay. */
1542 req->rq_repmsg->status = aa->praa_old_status;
1545 spin_lock_irqsave(&imp->imp_lock, flags);
1546 imp->imp_last_replay_transno = req->rq_transno;
1547 spin_unlock_irqrestore(&imp->imp_lock, flags);
1549 /* continue with recovery */
1550 rc = ptlrpc_import_recovery_state_machine(imp);
1552 req->rq_send_state = aa->praa_old_state;
1555 /* this replay failed, so restart recovery */
1556 ptlrpc_connect_import(imp, NULL);
1562 int ptlrpc_replay_req(struct ptlrpc_request *req)
1564 struct ptlrpc_replay_async_args *aa;
1567 LASSERT(req->rq_import->imp_state == LUSTRE_IMP_REPLAY);
1569 /* Not handling automatic bulk replay yet (or ever?) */
1570 LASSERT(req->rq_bulk == NULL);
1572 DEBUG_REQ(D_HA, req, "REPLAY");
1574 LASSERT (sizeof (*aa) <= sizeof (req->rq_async_args));
1575 aa = (struct ptlrpc_replay_async_args *)&req->rq_async_args;
1576 memset(aa, 0, sizeof *aa);
1578 /* Prepare request to be resent with ptlrpcd */
1579 aa->praa_old_state = req->rq_send_state;
1580 req->rq_send_state = LUSTRE_IMP_REPLAY;
1581 req->rq_phase = RQ_PHASE_NEW;
1583 * Q: "How can a req get on the replay list if it wasn't replied?"
1584 * A: "If we failed during the replay of this request, it will still
1585 * be on the list, but rq_replied will have been reset to 0."
1587 if (req->rq_replied) {
1588 aa->praa_old_status = req->rq_repmsg->status;
1590 req->rq_replied = 0;
1593 req->rq_interpret_reply = ptlrpc_replay_interpret;
1594 atomic_inc(&req->rq_import->imp_replay_inflight);
1595 ptlrpc_request_addref(req); /* ptlrpcd needs a ref */
1597 ptlrpcd_add_req(req);
1601 void ptlrpc_abort_inflight(struct obd_import *imp)
1603 unsigned long flags;
1604 struct list_head *tmp, *n;
1607 /* Make sure that no new requests get processed for this import.
1608 * ptlrpc_{queue,set}_wait must (and does) hold imp_lock while testing
1609 * this flag and then putting requests on sending_list or delayed_list.
1611 spin_lock_irqsave(&imp->imp_lock, flags);
1613 /* XXX locking? Maybe we should remove each request with the list
1614 * locked? Also, how do we know if the requests on the list are
1615 * being freed at this time?
1617 list_for_each_safe(tmp, n, &imp->imp_sending_list) {
1618 struct ptlrpc_request *req =
1619 list_entry(tmp, struct ptlrpc_request, rq_list);
1621 DEBUG_REQ(D_HA, req, "inflight");
1623 spin_lock (&req->rq_lock);
1624 if (req->rq_import_generation < imp->imp_generation) {
1626 ptlrpc_wake_client_req(req);
1628 spin_unlock (&req->rq_lock);
1631 list_for_each_safe(tmp, n, &imp->imp_delayed_list) {
1632 struct ptlrpc_request *req =
1633 list_entry(tmp, struct ptlrpc_request, rq_list);
1635 DEBUG_REQ(D_HA, req, "aborting waiting req");
1637 spin_lock (&req->rq_lock);
1638 if (req->rq_import_generation < imp->imp_generation) {
1640 ptlrpc_wake_client_req(req);
1642 spin_unlock (&req->rq_lock);
1645 /* Last chance to free reqs left on the replay list, but we
1646 * will still leak reqs that haven't comitted. */
1647 if (imp->imp_replayable)
1648 ptlrpc_free_committed(imp);
1650 spin_unlock_irqrestore(&imp->imp_lock, flags);
1655 static __u64 ptlrpc_last_xid = 0;
1656 static spinlock_t ptlrpc_last_xid_lock = SPIN_LOCK_UNLOCKED;
1658 __u64 ptlrpc_next_xid(void)
1661 spin_lock(&ptlrpc_last_xid_lock);
1662 tmp = ++ptlrpc_last_xid;
1663 spin_unlock(&ptlrpc_last_xid_lock);