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 the Lustre file system, http://www.lustre.org
7 * Lustre is a trademark of Cluster File Systems, Inc.
9 * You may have signed or agreed to another license before downloading
10 * this software. If so, you are bound by the terms and conditions
11 * of that agreement, and the following does not apply to you. See the
12 * LICENSE file included with this distribution for more information.
14 * If you did not agree to a different license, then this copy of Lustre
15 * is open source software; you can redistribute it and/or modify it
16 * under the terms of version 2 of the GNU General Public License as
17 * published by the Free Software Foundation.
19 * In either case, Lustre is distributed in the hope that it will be
20 * useful, but WITHOUT ANY WARRANTY; without even the implied warranty
21 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * license text for more details.
25 #define DEBUG_SUBSYSTEM S_LDLM
28 #include <liblustre.h>
31 #include <lustre_dlm.h>
32 #include <obd_class.h>
35 #include "ldlm_internal.h"
37 static void interrupted_completion_wait(void *data)
41 struct lock_wait_data {
42 struct ldlm_lock *lwd_lock;
46 int ldlm_expired_completion_wait(void *data)
48 struct lock_wait_data *lwd = data;
49 struct ldlm_lock *lock = lwd->lwd_lock;
50 struct obd_import *imp;
51 struct obd_device *obd;
54 if (lock->l_conn_export == NULL) {
55 static cfs_time_t next_dump = 0, last_dump = 0;
57 LDLM_ERROR(lock, "lock timed out (enqueued at %lu, %lus ago); "
58 "not entering recovery in server code, just going "
59 "back to sleep", lock->l_enqueued_time.tv_sec,
60 CURRENT_SECONDS - lock->l_enqueued_time.tv_sec);
61 if (cfs_time_after(cfs_time_current(), next_dump)) {
62 last_dump = next_dump;
63 next_dump = cfs_time_shift(300);
64 ldlm_namespace_dump(D_DLMTRACE,
65 lock->l_resource->lr_namespace);
67 libcfs_debug_dumplog();
72 obd = lock->l_conn_export->exp_obd;
73 imp = obd->u.cli.cl_import;
74 ptlrpc_fail_import(imp, lwd->lwd_conn_cnt);
75 LDLM_ERROR(lock, "lock timed out (enqueued at %lu, %lus ago), entering "
76 "recovery for %s@%s", lock->l_enqueued_time.tv_sec,
77 CURRENT_SECONDS - lock->l_enqueued_time.tv_sec,
78 obd2cli_tgt(obd), imp->imp_connection->c_remote_uuid.uuid);
83 int ldlm_completion_ast(struct ldlm_lock *lock, int flags, void *data)
85 /* XXX ALLOCATE - 160 bytes */
86 struct lock_wait_data lwd;
87 struct obd_device *obd;
88 struct obd_import *imp = NULL;
89 struct l_wait_info lwi;
93 if (flags == LDLM_FL_WAIT_NOREPROC) {
94 LDLM_DEBUG(lock, "client-side enqueue waiting on pending lock");
98 if (!(flags & (LDLM_FL_BLOCK_WAIT | LDLM_FL_BLOCK_GRANTED |
99 LDLM_FL_BLOCK_CONV))) {
100 cfs_waitq_signal(&lock->l_waitq);
104 LDLM_DEBUG(lock, "client-side enqueue returned a blocked lock, "
106 ldlm_lock_dump(D_OTHER, lock, 0);
107 ldlm_reprocess_all(lock->l_resource);
111 obd = class_exp2obd(lock->l_conn_export);
113 /* if this is a local lock, then there is no import */
115 imp = obd->u.cli.cl_import;
119 if (lock->l_flags & LDLM_FL_NO_TIMEOUT) {
120 LDLM_DEBUG(lock, "waiting indefinitely because of NO_TIMEOUT");
121 lwi = LWI_INTR(interrupted_completion_wait, &lwd);
123 lwi = LWI_TIMEOUT_INTR(cfs_time_seconds(obd_timeout),
124 ldlm_expired_completion_wait,
125 interrupted_completion_wait, &lwd);
129 spin_lock(&imp->imp_lock);
130 lwd.lwd_conn_cnt = imp->imp_conn_cnt;
131 spin_unlock(&imp->imp_lock);
134 /* Go to sleep until the lock is granted or cancelled. */
135 rc = l_wait_event(lock->l_waitq,
136 ((lock->l_req_mode == lock->l_granted_mode) ||
137 (lock->l_flags & LDLM_FL_FAILED)), &lwi);
139 if (lock->l_destroyed || lock->l_flags & LDLM_FL_FAILED) {
140 LDLM_DEBUG(lock, "client-side enqueue waking up: destroyed");
145 LDLM_DEBUG(lock, "client-side enqueue waking up: failed (%d)",
150 LDLM_DEBUG(lock, "client-side enqueue waking up: granted");
155 * ->l_blocking_ast() callback for LDLM locks acquired by server-side OBDs.
157 int ldlm_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
158 void *data, int flag)
163 if (flag == LDLM_CB_CANCELING) {
164 /* Don't need to do anything here. */
168 lock_res_and_lock(lock);
169 /* Get this: if ldlm_blocking_ast is racing with intent_policy, such
170 * that ldlm_blocking_ast is called just before intent_policy method
171 * takes the ns_lock, then by the time we get the lock, we might not
172 * be the correct blocking function anymore. So check, and return
174 if (lock->l_blocking_ast != ldlm_blocking_ast) {
175 unlock_res_and_lock(lock);
179 lock->l_flags |= LDLM_FL_CBPENDING;
180 do_ast = (!lock->l_readers && !lock->l_writers);
181 unlock_res_and_lock(lock);
184 struct lustre_handle lockh;
187 LDLM_DEBUG(lock, "already unused, calling ldlm_cli_cancel");
188 ldlm_lock2handle(lock, &lockh);
189 rc = ldlm_cli_cancel(&lockh);
191 CERROR("ldlm_cli_cancel: %d\n", rc);
193 LDLM_DEBUG(lock, "Lock still has references, will be "
200 * ->l_glimpse_ast() for DLM extent locks acquired on the server-side. See
201 * comment in filter_intent_policy() on why you may need this.
203 int ldlm_glimpse_ast(struct ldlm_lock *lock, void *reqp)
206 * Returning -ELDLM_NO_LOCK_DATA actually works, but the reason for
207 * that is rather subtle: with OST-side locking, it may so happen that
208 * _all_ extent locks are held by the OST. If client wants to obtain
209 * current file size it calls ll{,u}_glimpse_size(), and (as locks are
210 * on the server), dummy glimpse callback fires and does
211 * nothing. Client still receives correct file size due to the
212 * following fragment in filter_intent_policy():
214 * rc = l->l_glimpse_ast(l, NULL); // this will update the LVB
215 * if (rc != 0 && res->lr_namespace->ns_lvbo &&
216 * res->lr_namespace->ns_lvbo->lvbo_update) {
217 * res->lr_namespace->ns_lvbo->lvbo_update(res, NULL, 0, 1);
220 * that is, after glimpse_ast() fails, filter_lvbo_update() runs, and
221 * returns correct file size to the client.
223 return -ELDLM_NO_LOCK_DATA;
226 int ldlm_cli_enqueue_local(struct ldlm_namespace *ns, struct ldlm_res_id res_id,
227 ldlm_type_t type, ldlm_policy_data_t *policy,
228 ldlm_mode_t mode, int *flags,
229 ldlm_blocking_callback blocking,
230 ldlm_completion_callback completion,
231 ldlm_glimpse_callback glimpse,
232 void *data, __u32 lvb_len, void *lvb_swabber,
233 struct lustre_handle *lockh)
235 struct ldlm_lock *lock;
239 LASSERT(!(*flags & LDLM_FL_REPLAY));
241 CERROR("Trying to enqueue local lock in a shadow namespace\n");
245 lock = ldlm_lock_create(ns, NULL, res_id, type, mode, blocking,
246 completion, glimpse, data, lvb_len);
248 GOTO(out_nolock, err = -ENOMEM);
249 LDLM_DEBUG(lock, "client-side local enqueue handler, new lock created");
251 ldlm_lock_addref_internal(lock, mode);
252 ldlm_lock2handle(lock, lockh);
253 lock_res_and_lock(lock);
254 lock->l_flags |= LDLM_FL_LOCAL;
255 if (*flags & LDLM_FL_ATOMIC_CB)
256 lock->l_flags |= LDLM_FL_ATOMIC_CB;
257 lock->l_lvb_swabber = lvb_swabber;
258 unlock_res_and_lock(lock);
260 lock->l_policy_data = *policy;
261 if (type == LDLM_EXTENT)
262 lock->l_req_extent = policy->l_extent;
264 err = ldlm_lock_enqueue(ns, &lock, policy, flags);
269 *policy = lock->l_policy_data;
270 if ((*flags) & LDLM_FL_LOCK_CHANGED)
271 res_id = lock->l_resource->lr_name;
273 LDLM_DEBUG_NOLOCK("client-side local enqueue handler END (lock %p)",
276 if (lock->l_completion_ast)
277 lock->l_completion_ast(lock, *flags, NULL);
279 LDLM_DEBUG(lock, "client-side local enqueue END");
287 static void failed_lock_cleanup(struct ldlm_namespace *ns,
288 struct ldlm_lock *lock,
289 struct lustre_handle *lockh, int mode)
291 /* Set a flag to prevent us from sending a CANCEL (bug 407) */
292 lock_res_and_lock(lock);
293 lock->l_flags |= LDLM_FL_LOCAL_ONLY;
294 unlock_res_and_lock(lock);
295 LDLM_DEBUG(lock, "setting FL_LOCAL_ONLY");
297 ldlm_lock_decref_and_cancel(lockh, mode);
299 /* XXX - HACK because we shouldn't call ldlm_lock_destroy()
300 * from llite/file.c/ll_file_flock(). */
301 if (lock->l_resource->lr_type == LDLM_FLOCK) {
302 ldlm_lock_destroy(lock);
306 int ldlm_cli_enqueue_fini(struct obd_export *exp, struct ptlrpc_request *req,
307 ldlm_type_t type, __u8 with_policy, ldlm_mode_t mode,
308 int *flags, void *lvb, __u32 lvb_len,
309 void *lvb_swabber, struct lustre_handle *lockh,int rc)
311 struct ldlm_namespace *ns = exp->exp_obd->obd_namespace;
312 int is_replay = *flags & LDLM_FL_REPLAY;
313 struct ldlm_lock *lock;
314 struct ldlm_reply *reply;
315 int cleanup_phase = 1;
318 lock = ldlm_handle2lock(lockh);
319 /* ldlm_cli_enqueue is holding a reference on this lock. */
320 LASSERT(lock != NULL);
321 if (rc != ELDLM_OK) {
323 LDLM_DEBUG(lock, "client-side enqueue END (%s)",
324 rc == ELDLM_LOCK_ABORTED ? "ABORTED" : "FAILED");
325 if (rc == ELDLM_LOCK_ABORTED) {
326 /* Before we return, swab the reply */
327 reply = lustre_swab_repbuf(req, DLM_LOCKREPLY_OFF,
329 lustre_swab_ldlm_reply);
331 CERROR("Can't unpack ldlm_reply\n");
336 tmplvb = lustre_swab_repbuf(req,
341 GOTO(cleanup, rc = -EPROTO);
343 memcpy(lvb, tmplvb, lvb_len);
349 reply = lustre_swab_repbuf(req, DLM_LOCKREPLY_OFF, sizeof(*reply),
350 lustre_swab_ldlm_reply);
352 CERROR("Can't unpack ldlm_reply\n");
353 GOTO(cleanup, rc = -EPROTO);
356 /* lock enqueued on the server */
359 lock_res_and_lock(lock);
360 lock->l_remote_handle = reply->lock_handle;
361 *flags = reply->lock_flags;
362 lock->l_flags |= reply->lock_flags & LDLM_INHERIT_FLAGS;
363 /* move NO_TIMEOUT flag to the lock to force ldlm_lock_match()
364 * to wait with no timeout as well */
365 lock->l_flags |= reply->lock_flags & LDLM_FL_NO_TIMEOUT;
366 unlock_res_and_lock(lock);
368 CDEBUG(D_INFO, "local: %p, remote cookie: "LPX64", flags: 0x%x\n",
369 lock, reply->lock_handle.cookie, *flags);
371 /* If enqueue returned a blocked lock but the completion handler has
372 * already run, then it fixed up the resource and we don't need to do it
374 if ((*flags) & LDLM_FL_LOCK_CHANGED) {
375 int newmode = reply->lock_desc.l_req_mode;
377 if (newmode && newmode != lock->l_req_mode) {
378 LDLM_DEBUG(lock, "server returned different mode %s",
379 ldlm_lockname[newmode]);
380 lock->l_req_mode = newmode;
383 if (reply->lock_desc.l_resource.lr_name.name[0] !=
384 lock->l_resource->lr_name.name[0]) {
385 CDEBUG(D_INFO, "remote intent success, locking %ld "
387 (long)reply->lock_desc.l_resource.lr_name.name[0],
388 (long)lock->l_resource->lr_name.name[0]);
390 ldlm_lock_change_resource(ns, lock,
391 reply->lock_desc.l_resource.lr_name);
392 if (lock->l_resource == NULL) {
394 GOTO(cleanup, rc = -ENOMEM);
396 LDLM_DEBUG(lock, "client-side enqueue, new resource");
399 if (!(type == LDLM_IBITS && !(exp->exp_connect_flags &
401 lock->l_policy_data =
402 reply->lock_desc.l_policy_data;
403 if (type != LDLM_PLAIN)
404 LDLM_DEBUG(lock,"client-side enqueue, new policy data");
407 if ((*flags) & LDLM_FL_AST_SENT ||
408 /* Cancel extent locks as soon as possible on a liblustre client,
409 * because it cannot handle asynchronous ASTs robustly (see
411 (LIBLUSTRE_CLIENT && type == LDLM_EXTENT)) {
412 lock_res_and_lock(lock);
413 lock->l_flags |= LDLM_FL_CBPENDING;
414 unlock_res_and_lock(lock);
415 LDLM_DEBUG(lock, "enqueue reply includes blocking AST");
418 /* If the lock has already been granted by a completion AST, don't
419 * clobber the LVB with an older one. */
420 if (lvb_len && (lock->l_req_mode != lock->l_granted_mode)) {
422 tmplvb = lustre_swab_repbuf(req, DLM_REPLY_REC_OFF, lvb_len,
425 GOTO(cleanup, rc = -EPROTO);
426 memcpy(lock->l_lvb_data, tmplvb, lvb_len);
430 rc = ldlm_lock_enqueue(ns, &lock, NULL, flags);
431 if (lock->l_completion_ast != NULL) {
432 int err = lock->l_completion_ast(lock, *flags, NULL);
435 if (rc && type != LDLM_FLOCK) /* bug 9425, bug 10250 */
440 if (lvb_len && lvb != NULL) {
441 /* Copy the LVB here, and not earlier, because the completion
442 * AST (if any) can override what we got in the reply */
443 memcpy(lvb, lock->l_lvb_data, lvb_len);
446 LDLM_DEBUG(lock, "client-side enqueue END");
449 if (cleanup_phase == 1 && rc)
450 failed_lock_cleanup(ns, lock, lockh, mode);
451 /* Put lock 2 times, the second reference is held by ldlm_cli_enqueue */
457 /* If a request has some specific initialisation it is passed in @reqp,
458 * otherwise it is created in ldlm_cli_enqueue.
460 * Supports sync and async requests, pass @async flag accordingly. If a
461 * request was created in ldlm_cli_enqueue and it is the async request,
462 * pass it to the caller in @reqp. */
463 int ldlm_cli_enqueue(struct obd_export *exp, struct ptlrpc_request **reqp,
464 struct ldlm_res_id res_id, ldlm_type_t type,
465 ldlm_policy_data_t *policy, ldlm_mode_t mode, int *flags,
466 ldlm_blocking_callback blocking,
467 ldlm_completion_callback completion,
468 ldlm_glimpse_callback glimpse,
469 void *data, void *lvb, __u32 lvb_len, void *lvb_swabber,
470 struct lustre_handle *lockh, int async)
472 struct ldlm_namespace *ns = exp->exp_obd->obd_namespace;
473 struct ldlm_lock *lock;
474 struct ldlm_request *body;
475 struct ldlm_reply *reply;
476 int size[3] = { [MSG_PTLRPC_BODY_OFF] = sizeof(struct ptlrpc_body),
477 [DLM_LOCKREQ_OFF] = sizeof(*body),
478 [DLM_REPLY_REC_OFF] = lvb_len };
479 int is_replay = *flags & LDLM_FL_REPLAY;
480 int req_passed_in = 1, rc;
481 struct ptlrpc_request *req;
484 LASSERT(exp != NULL);
486 /* If we're replaying this lock, just check some invariants.
487 * If we're creating a new lock, get everything all setup nice. */
489 lock = ldlm_handle2lock(lockh);
490 LASSERT(lock != NULL);
491 LDLM_DEBUG(lock, "client-side enqueue START");
492 LASSERT(exp == lock->l_conn_export);
494 lock = ldlm_lock_create(ns, NULL, res_id, type, mode, blocking,
495 completion, glimpse, data, lvb_len);
498 /* for the local lock, add the reference */
499 ldlm_lock_addref_internal(lock, mode);
500 ldlm_lock2handle(lock, lockh);
501 lock->l_lvb_swabber = lvb_swabber;
502 if (policy != NULL) {
503 /* INODEBITS_INTEROP: If the server does not support
504 * inodebits, we will request a plain lock in the
505 * descriptor (ldlm_lock2desc() below) but use an
506 * inodebits lock internally with both bits set.
508 if (type == LDLM_IBITS && !(exp->exp_connect_flags &
510 lock->l_policy_data.l_inodebits.bits =
511 MDS_INODELOCK_LOOKUP |
512 MDS_INODELOCK_UPDATE;
514 lock->l_policy_data = *policy;
517 if (type == LDLM_EXTENT)
518 lock->l_req_extent = policy->l_extent;
519 LDLM_DEBUG(lock, "client-side enqueue START");
522 /* lock not sent to server yet */
524 if (reqp == NULL || *reqp == NULL) {
525 req = ptlrpc_prep_req(class_exp2cliimp(exp), LUSTRE_DLM_VERSION,
526 LDLM_ENQUEUE, 2, size, NULL);
528 failed_lock_cleanup(ns, lock, lockh, mode);
537 LASSERTF(lustre_msg_buflen(req->rq_reqmsg, DLM_LOCKREQ_OFF) ==
538 sizeof(*body), "buflen[%d] = %d, not "LPSZ"\n",
540 lustre_msg_buflen(req->rq_reqmsg, DLM_LOCKREQ_OFF),
544 lock->l_conn_export = exp;
545 lock->l_export = NULL;
546 lock->l_blocking_ast = blocking;
548 /* Dump lock data into the request buffer */
549 body = lustre_msg_buf(req->rq_reqmsg, DLM_LOCKREQ_OFF, sizeof(*body));
550 ldlm_lock2desc(lock, &body->lock_desc);
551 body->lock_flags = *flags;
552 body->lock_handle1 = *lockh;
554 /* Continue as normal. */
555 if (!req_passed_in) {
556 size[DLM_LOCKREPLY_OFF] = sizeof(*reply);
557 ptlrpc_req_set_repsize(req, 2 + (lvb_len > 0), size);
561 * Liblustre client doesn't get extent locks, except for O_APPEND case
562 * where [0, OBD_OBJECT_EOF] lock is taken, or truncate, where
563 * [i_size, OBD_OBJECT_EOF] lock is taken.
565 LASSERT(ergo(LIBLUSTRE_CLIENT, type != LDLM_EXTENT ||
566 policy->l_extent.end == OBD_OBJECT_EOF));
569 LASSERT(reqp != NULL);
573 LDLM_DEBUG(lock, "sending request");
574 rc = ptlrpc_queue_wait(req);
575 rc = ldlm_cli_enqueue_fini(exp, req, type, policy ? 1 : 0,
576 mode, flags, lvb, lvb_len, lvb_swabber,
579 if (!req_passed_in && req != NULL) {
580 ptlrpc_req_finished(req);
588 static int ldlm_cli_convert_local(struct ldlm_lock *lock, int new_mode,
591 struct ldlm_resource *res;
594 if (lock->l_resource->lr_namespace->ns_client) {
595 CERROR("Trying to cancel local lock\n");
598 LDLM_DEBUG(lock, "client-side local convert");
600 res = ldlm_lock_convert(lock, new_mode, flags);
602 ldlm_reprocess_all(res);
607 LDLM_DEBUG(lock, "client-side local convert handler END");
612 /* FIXME: one of ldlm_cli_convert or the server side should reject attempted
613 * conversion of locks which are on the waiting or converting queue */
614 /* Caller of this code is supposed to take care of lock readers/writers
616 int ldlm_cli_convert(struct lustre_handle *lockh, int new_mode, int *flags)
618 struct ldlm_request *body;
619 struct ldlm_reply *reply;
620 struct ldlm_lock *lock;
621 struct ldlm_resource *res;
622 struct ptlrpc_request *req;
623 int size[2] = { [MSG_PTLRPC_BODY_OFF] = sizeof(struct ptlrpc_body),
624 [DLM_LOCKREQ_OFF] = sizeof(*body) };
628 lock = ldlm_handle2lock(lockh);
635 if (lock->l_conn_export == NULL)
636 RETURN(ldlm_cli_convert_local(lock, new_mode, flags));
638 LDLM_DEBUG(lock, "client-side convert");
640 req = ptlrpc_prep_req(class_exp2cliimp(lock->l_conn_export),
641 LUSTRE_DLM_VERSION, LDLM_CONVERT, 2, size, NULL);
643 GOTO(out, rc = -ENOMEM);
645 body = lustre_msg_buf(req->rq_reqmsg, DLM_LOCKREQ_OFF, sizeof(*body));
646 body->lock_handle1 = lock->l_remote_handle;
648 body->lock_desc.l_req_mode = new_mode;
649 body->lock_flags = *flags;
651 size[DLM_LOCKREPLY_OFF] = sizeof(*reply);
652 ptlrpc_req_set_repsize(req, 2, size);
654 rc = ptlrpc_queue_wait(req);
658 reply = lustre_swab_repbuf(req, DLM_LOCKREPLY_OFF, sizeof(*reply),
659 lustre_swab_ldlm_reply);
661 CERROR ("Can't unpack ldlm_reply\n");
662 GOTO (out, rc = -EPROTO);
666 GOTO(out, rc = req->rq_status);
668 res = ldlm_lock_convert(lock, new_mode, &reply->lock_flags);
670 ldlm_reprocess_all(res);
671 /* Go to sleep until the lock is granted. */
672 /* FIXME: or cancelled. */
673 if (lock->l_completion_ast) {
674 rc = lock->l_completion_ast(lock, LDLM_FL_WAIT_NOREPROC,
685 ptlrpc_req_finished(req);
689 int ldlm_cli_cancel(struct lustre_handle *lockh)
691 struct ptlrpc_request *req;
692 struct ldlm_lock *lock;
693 struct ldlm_request *body;
694 int size[2] = { [MSG_PTLRPC_BODY_OFF] = sizeof(struct ptlrpc_body),
695 [DLM_LOCKREQ_OFF] = sizeof(*body) };
699 /* concurrent cancels on the same handle can happen */
700 lock = __ldlm_handle2lock(lockh, LDLM_FL_CANCELING);
704 if (lock->l_conn_export) {
706 struct obd_import *imp;
708 LDLM_DEBUG(lock, "client-side cancel");
709 /* Set this flag to prevent others from getting new references*/
710 lock_res_and_lock(lock);
711 lock->l_flags |= LDLM_FL_CBPENDING;
712 local_only = (lock->l_flags &
713 (LDLM_FL_LOCAL_ONLY|LDLM_FL_CANCEL_ON_BLOCK));
714 ldlm_cancel_callback(lock);
715 unlock_res_and_lock(lock);
718 CDEBUG(D_INFO, "not sending request (at caller's "
724 imp = class_exp2cliimp(lock->l_conn_export);
725 if (imp == NULL || imp->imp_invalid) {
726 CDEBUG(D_HA, "skipping cancel on invalid import %p\n",
731 req = ptlrpc_prep_req(imp, LUSTRE_DLM_VERSION, LDLM_CANCEL, 2,
734 GOTO(out, rc = -ENOMEM);
735 req->rq_no_resend = 1;
737 /* XXX FIXME bug 249 */
738 req->rq_request_portal = LDLM_CANCEL_REQUEST_PORTAL;
739 req->rq_reply_portal = LDLM_CANCEL_REPLY_PORTAL;
741 body = lustre_msg_buf(req->rq_reqmsg, DLM_LOCKREQ_OFF,
743 body->lock_handle1 = lock->l_remote_handle;
745 ptlrpc_req_set_repsize(req, 1, NULL);
746 rc = ptlrpc_queue_wait(req);
749 CDEBUG(D_DLMTRACE, "client/server (nid %s) out of sync "
750 "-- not fatal, flags %x\n",
751 libcfs_nid2str(req->rq_import->
752 imp_connection->c_peer.nid),
754 } else if (rc == -ETIMEDOUT) {
755 ptlrpc_req_finished(req);
757 } else if (rc != ELDLM_OK) {
758 CERROR("Got rc %d from cancel RPC: canceling "
762 ptlrpc_req_finished(req);
764 ldlm_lock_cancel(lock);
766 if (lock->l_resource->lr_namespace->ns_client) {
767 LDLM_ERROR(lock, "Trying to cancel local lock");
770 LDLM_DEBUG(lock, "client-side local cancel");
771 ldlm_lock_cancel(lock);
772 ldlm_reprocess_all(lock->l_resource);
773 LDLM_DEBUG(lock, "client-side local cancel handler END");
782 /* when called with LDLM_ASYNC the blocking callback will be handled
783 * in a thread and this function will return after the thread has been
784 * asked to call the callback. when called with LDLM_SYNC the blocking
785 * callback will be performed in this function. */
786 int ldlm_cancel_lru(struct ldlm_namespace *ns, ldlm_sync_t sync)
788 struct ldlm_lock *lock, *next;
790 CFS_LIST_HEAD(cblist);
794 sync = LDLM_SYNC; /* force to be sync in user space */
797 spin_lock(&ns->ns_unused_lock);
798 count = ns->ns_nr_unused - ns->ns_max_unused;
801 spin_unlock(&ns->ns_unused_lock);
805 while (!list_empty(&ns->ns_unused_list)) {
806 struct list_head *tmp = ns->ns_unused_list.next;
807 lock = list_entry(tmp, struct ldlm_lock, l_lru);
808 LASSERT(!lock->l_readers && !lock->l_writers);
810 LDLM_LOCK_GET(lock); /* dropped by bl thread */
811 spin_unlock(&ns->ns_unused_lock);
813 lock_res_and_lock(lock);
814 if (ldlm_lock_remove_from_lru(lock) == 0) {
815 /* other thread is removing lock from lru */
816 unlock_res_and_lock(lock);
818 spin_lock(&ns->ns_unused_lock);
823 /* If we have chosen to canecl this lock voluntarily, we better
824 send cancel notification to server, so that it frees
825 appropriate state. This might lead to a race where while
826 we are doing cancel here, server is also silently
827 cancelling this lock. */
828 lock->l_flags &= ~LDLM_FL_CANCEL_ON_BLOCK;
830 /* Setting the CBPENDING flag is a little misleading, but
831 * prevents an important race; namely, once CBPENDING is set,
832 * the lock can accumulate no more readers/writers. Since
833 * readers and writers are already zero here, ldlm_lock_decref
834 * won't see this flag and call l_blocking_ast */
835 lock->l_flags |= LDLM_FL_CBPENDING;
837 /* We can't re-add to l_lru as it confuses the refcounting in
838 * ldlm_lock_remove_from_lru() if an AST arrives after we drop
839 * ns_lock below. We use l_tmp and can't use l_pending_chain as
840 * it is used both on server and client nevertheles bug 5666
841 * says it is used only on server. --umka */
842 list_add(&lock->l_tmp, &cblist);
843 unlock_res_and_lock(lock);
845 LDLM_LOCK_GET(lock); /* to hold lock after bl thread */
846 if (sync == LDLM_ASYNC && (ldlm_bl_to_thread(ns, NULL, lock) == 0)) {
847 lock_res_and_lock(lock);
848 list_del_init(&lock->l_tmp);
849 unlock_res_and_lock(lock);
853 spin_lock(&ns->ns_unused_lock);
858 spin_unlock(&ns->ns_unused_lock);
860 list_for_each_entry_safe(lock, next, &cblist, l_tmp) {
861 list_del_init(&lock->l_tmp);
862 ldlm_handle_bl_callback(ns, NULL, lock);
868 static int ldlm_cli_cancel_unused_resource(struct ldlm_namespace *ns,
869 struct ldlm_res_id res_id, int flags,
872 struct list_head *tmp, *next, list = CFS_LIST_HEAD_INIT(list);
873 struct ldlm_resource *res;
874 struct ldlm_lock *lock;
877 res = ldlm_resource_get(ns, NULL, res_id, 0, 0);
879 /* This is not a problem. */
880 CDEBUG(D_INFO, "No resource "LPU64"\n", res_id.name[0]);
885 list_for_each(tmp, &res->lr_granted) {
886 lock = list_entry(tmp, struct ldlm_lock, l_res_link);
888 if (opaque != NULL && lock->l_ast_data != opaque) {
889 LDLM_ERROR(lock, "data %p doesn't match opaque %p",
890 lock->l_ast_data, opaque);
895 if (lock->l_readers || lock->l_writers) {
896 if (flags & LDLM_FL_WARN) {
897 LDLM_ERROR(lock, "lock in use");
903 /* See CBPENDING comment in ldlm_cancel_lru */
904 lock->l_flags |= LDLM_FL_CBPENDING;
906 LASSERT(list_empty(&lock->l_bl_ast));
907 list_add(&lock->l_bl_ast, &list);
912 list_for_each_safe(tmp, next, &list) {
913 struct lustre_handle lockh;
915 lock = list_entry(tmp, struct ldlm_lock, l_bl_ast);
917 if (flags & LDLM_FL_LOCAL_ONLY) {
918 ldlm_lock_cancel(lock);
920 ldlm_lock2handle(lock, &lockh);
921 rc = ldlm_cli_cancel(&lockh);
923 CERROR("ldlm_cli_cancel: %d\n", rc);
925 list_del_init(&lock->l_bl_ast);
929 ldlm_resource_putref(res);
934 static inline int have_no_nsresource(struct ldlm_namespace *ns)
938 spin_lock(&ns->ns_hash_lock);
939 if (ns->ns_resources == 0)
941 spin_unlock(&ns->ns_hash_lock);
946 /* Cancel all locks on a namespace (or a specific resource, if given)
947 * that have 0 readers/writers.
949 * If flags & LDLM_FL_LOCAL_ONLY, throw the locks away without trying
950 * to notify the server.
951 * If flags & LDLM_FL_WARN, print a warning if some locks are still in use. */
952 int ldlm_cli_cancel_unused(struct ldlm_namespace *ns,
953 struct ldlm_res_id *res_id, int flags, void *opaque)
962 RETURN(ldlm_cli_cancel_unused_resource(ns, *res_id, flags,
965 spin_lock(&ns->ns_hash_lock);
966 for (i = 0; i < RES_HASH_SIZE; i++) {
967 struct list_head *tmp;
968 tmp = ns->ns_hash[i].next;
969 while (tmp != &(ns->ns_hash[i])) {
970 struct ldlm_resource *res;
973 res = list_entry(tmp, struct ldlm_resource, lr_hash);
974 ldlm_resource_getref(res);
975 spin_unlock(&ns->ns_hash_lock);
977 rc = ldlm_cli_cancel_unused_resource(ns, res->lr_name,
981 CERROR("cancel_unused_res ("LPU64"): %d\n",
982 res->lr_name.name[0], rc);
984 spin_lock(&ns->ns_hash_lock);
986 ldlm_resource_putref_locked(res);
989 spin_unlock(&ns->ns_hash_lock);
994 /* join/split resource locks to/from lru list */
995 int ldlm_cli_join_lru(struct ldlm_namespace *ns,
996 struct ldlm_res_id *res_id, int join)
998 struct ldlm_resource *res;
999 struct ldlm_lock *lock, *n;
1003 LASSERT(ns->ns_client == LDLM_NAMESPACE_CLIENT);
1005 res = ldlm_resource_get(ns, NULL, *res_id, LDLM_EXTENT, 0);
1008 LASSERT(res->lr_type == LDLM_EXTENT);
1014 list_for_each_entry_safe (lock, n, &res->lr_granted, l_res_link) {
1015 if (list_empty(&lock->l_lru) &&
1016 !lock->l_readers && !lock->l_writers &&
1017 !(lock->l_flags & LDLM_FL_LOCAL) &&
1018 !(lock->l_flags & LDLM_FL_CBPENDING)) {
1019 spin_lock(&ns->ns_unused_lock);
1020 LASSERT(ns->ns_nr_unused >= 0);
1021 list_add_tail(&lock->l_lru, &ns->ns_unused_list);
1023 spin_unlock(&ns->ns_unused_lock);
1024 lock->l_flags &= ~LDLM_FL_NO_LRU;
1025 LDLM_DEBUG(lock, "join lock to lru");
1031 spin_lock(&ns->ns_unused_lock);
1032 list_for_each_entry_safe (lock, n, &ns->ns_unused_list, l_lru) {
1033 if (lock->l_resource == res) {
1034 ldlm_lock_remove_from_lru_nolock(lock);
1035 lock->l_flags |= LDLM_FL_NO_LRU;
1036 LDLM_DEBUG(lock, "split lock from lru");
1040 spin_unlock(&ns->ns_unused_lock);
1043 ldlm_resource_putref(res);
1047 /* Lock iterators. */
1049 int ldlm_resource_foreach(struct ldlm_resource *res, ldlm_iterator_t iter,
1052 struct list_head *tmp, *next;
1053 struct ldlm_lock *lock;
1054 int rc = LDLM_ITER_CONTINUE;
1059 RETURN(LDLM_ITER_CONTINUE);
1062 list_for_each_safe(tmp, next, &res->lr_granted) {
1063 lock = list_entry(tmp, struct ldlm_lock, l_res_link);
1065 if (iter(lock, closure) == LDLM_ITER_STOP)
1066 GOTO(out, rc = LDLM_ITER_STOP);
1069 list_for_each_safe(tmp, next, &res->lr_converting) {
1070 lock = list_entry(tmp, struct ldlm_lock, l_res_link);
1072 if (iter(lock, closure) == LDLM_ITER_STOP)
1073 GOTO(out, rc = LDLM_ITER_STOP);
1076 list_for_each_safe(tmp, next, &res->lr_waiting) {
1077 lock = list_entry(tmp, struct ldlm_lock, l_res_link);
1079 if (iter(lock, closure) == LDLM_ITER_STOP)
1080 GOTO(out, rc = LDLM_ITER_STOP);
1087 struct iter_helper_data {
1088 ldlm_iterator_t iter;
1092 static int ldlm_iter_helper(struct ldlm_lock *lock, void *closure)
1094 struct iter_helper_data *helper = closure;
1095 return helper->iter(lock, helper->closure);
1098 static int ldlm_res_iter_helper(struct ldlm_resource *res, void *closure)
1100 return ldlm_resource_foreach(res, ldlm_iter_helper, closure);
1103 int ldlm_namespace_foreach(struct ldlm_namespace *ns, ldlm_iterator_t iter,
1106 struct iter_helper_data helper = { iter: iter, closure: closure };
1107 return ldlm_namespace_foreach_res(ns, ldlm_res_iter_helper, &helper);
1110 int ldlm_namespace_foreach_res(struct ldlm_namespace *ns,
1111 ldlm_res_iterator_t iter, void *closure)
1113 int i, rc = LDLM_ITER_CONTINUE;
1114 struct ldlm_resource *res;
1115 struct list_head *tmp;
1118 spin_lock(&ns->ns_hash_lock);
1119 for (i = 0; i < RES_HASH_SIZE; i++) {
1120 tmp = ns->ns_hash[i].next;
1121 while (tmp != &(ns->ns_hash[i])) {
1122 res = list_entry(tmp, struct ldlm_resource, lr_hash);
1123 ldlm_resource_getref(res);
1124 spin_unlock(&ns->ns_hash_lock);
1126 rc = iter(res, closure);
1128 spin_lock(&ns->ns_hash_lock);
1130 ldlm_resource_putref_locked(res);
1131 if (rc == LDLM_ITER_STOP)
1136 spin_unlock(&ns->ns_hash_lock);
1140 /* non-blocking function to manipulate a lock whose cb_data is being put away.*/
1141 void ldlm_resource_iterate(struct ldlm_namespace *ns, struct ldlm_res_id *res_id,
1142 ldlm_iterator_t iter, void *data)
1144 struct ldlm_resource *res;
1148 CERROR("must pass in namespace\n");
1152 res = ldlm_resource_get(ns, NULL, *res_id, 0, 0);
1158 ldlm_resource_foreach(res, iter, data);
1159 ldlm_resource_putref(res);
1165 static int ldlm_chain_lock_for_replay(struct ldlm_lock *lock, void *closure)
1167 struct list_head *list = closure;
1169 /* we use l_pending_chain here, because it's unused on clients. */
1170 LASSERTF(list_empty(&lock->l_pending_chain),"lock %p next %p prev %p\n",
1171 lock, &lock->l_pending_chain.next,&lock->l_pending_chain.prev);
1172 /* bug 9573: don't replay locks left after eviction */
1173 if (!(lock->l_flags & LDLM_FL_FAILED))
1174 list_add(&lock->l_pending_chain, list);
1175 return LDLM_ITER_CONTINUE;
1178 static int replay_lock_interpret(struct ptlrpc_request *req,
1179 void * data, int rc)
1181 struct ldlm_lock *lock;
1182 struct ldlm_reply *reply;
1185 atomic_dec(&req->rq_import->imp_replay_inflight);
1189 lock = req->rq_async_args.pointer_arg[0];
1190 LASSERT(lock != NULL);
1192 reply = lustre_swab_repbuf(req, DLM_LOCKREPLY_OFF, sizeof(*reply),
1193 lustre_swab_ldlm_reply);
1194 if (reply == NULL) {
1195 CERROR("Can't unpack ldlm_reply\n");
1196 GOTO (out, rc = -EPROTO);
1199 lock->l_remote_handle = reply->lock_handle;
1200 LDLM_DEBUG(lock, "replayed lock:");
1201 ptlrpc_import_recovery_state_machine(req->rq_import);
1204 ptlrpc_connect_import(req->rq_import, NULL);
1210 static int replay_one_lock(struct obd_import *imp, struct ldlm_lock *lock)
1212 struct ptlrpc_request *req;
1213 struct ldlm_request *body;
1214 struct ldlm_reply *reply;
1216 int size[3] = { sizeof(struct ptlrpc_body) };
1220 /* If this is reply-less callback lock, we cannot replay it, since
1221 * server might have long dropped it, but notification of that event was
1222 * lost by network. (and server granted conflicting lock already) */
1223 if (lock->l_flags & LDLM_FL_CANCEL_ON_BLOCK) {
1224 LDLM_DEBUG(lock, "Not replaying reply-less lock:");
1225 ldlm_lock_cancel(lock);
1229 * If granted mode matches the requested mode, this lock is granted.
1231 * If they differ, but we have a granted mode, then we were granted
1232 * one mode and now want another: ergo, converting.
1234 * If we haven't been granted anything and are on a resource list,
1235 * then we're blocked/waiting.
1237 * If we haven't been granted anything and we're NOT on a resource list,
1238 * then we haven't got a reply yet and don't have a known disposition.
1239 * This happens whenever a lock enqueue is the request that triggers
1242 if (lock->l_granted_mode == lock->l_req_mode)
1243 flags = LDLM_FL_REPLAY | LDLM_FL_BLOCK_GRANTED;
1244 else if (lock->l_granted_mode)
1245 flags = LDLM_FL_REPLAY | LDLM_FL_BLOCK_CONV;
1246 else if (!list_empty(&lock->l_res_link))
1247 flags = LDLM_FL_REPLAY | LDLM_FL_BLOCK_WAIT;
1249 flags = LDLM_FL_REPLAY;
1251 size[DLM_LOCKREQ_OFF] = sizeof(*body);
1252 req = ptlrpc_prep_req(imp, LUSTRE_DLM_VERSION, LDLM_ENQUEUE, 2, size,
1257 /* We're part of recovery, so don't wait for it. */
1258 req->rq_send_state = LUSTRE_IMP_REPLAY_LOCKS;
1260 body = lustre_msg_buf(req->rq_reqmsg, DLM_LOCKREQ_OFF, sizeof(*body));
1261 ldlm_lock2desc(lock, &body->lock_desc);
1262 body->lock_flags = flags;
1264 ldlm_lock2handle(lock, &body->lock_handle1);
1265 size[DLM_LOCKREPLY_OFF] = sizeof(*reply);
1266 if (lock->l_lvb_len != 0) {
1268 size[DLM_REPLY_REC_OFF] = lock->l_lvb_len;
1270 ptlrpc_req_set_repsize(req, buffers, size);
1272 LDLM_DEBUG(lock, "replaying lock:");
1274 atomic_inc(&req->rq_import->imp_replay_inflight);
1275 req->rq_async_args.pointer_arg[0] = lock;
1276 req->rq_interpret_reply = replay_lock_interpret;
1277 ptlrpcd_add_req(req);
1282 int ldlm_replay_locks(struct obd_import *imp)
1284 struct ldlm_namespace *ns = imp->imp_obd->obd_namespace;
1285 struct list_head list;
1286 struct ldlm_lock *lock, *next;
1290 CFS_INIT_LIST_HEAD(&list);
1292 LASSERT(atomic_read(&imp->imp_replay_inflight) == 0);
1294 /* ensure this doesn't fall to 0 before all have been queued */
1295 atomic_inc(&imp->imp_replay_inflight);
1297 (void)ldlm_namespace_foreach(ns, ldlm_chain_lock_for_replay, &list);
1299 list_for_each_entry_safe(lock, next, &list, l_pending_chain) {
1300 list_del_init(&lock->l_pending_chain);
1302 continue; /* or try to do the rest? */
1303 rc = replay_one_lock(imp, lock);
1306 atomic_dec(&imp->imp_replay_inflight);