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 if (ptlrpc_check_suspend())
60 LDLM_ERROR(lock, "lock timed out (enqueued at %lu, %lus ago); "
61 "not entering recovery in server code, just going "
62 "back to sleep", lock->l_enqueued_time.tv_sec,
63 CURRENT_SECONDS - lock->l_enqueued_time.tv_sec);
64 if (cfs_time_after(cfs_time_current(), next_dump)) {
65 last_dump = next_dump;
66 next_dump = cfs_time_shift(300);
67 ldlm_namespace_dump(D_DLMTRACE,
68 lock->l_resource->lr_namespace);
70 libcfs_debug_dumplog();
75 obd = lock->l_conn_export->exp_obd;
76 imp = obd->u.cli.cl_import;
77 ptlrpc_fail_import(imp, lwd->lwd_conn_cnt);
78 LDLM_ERROR(lock, "lock timed out (enqueued at %lu, %lus ago), entering "
79 "recovery for %s@%s", lock->l_enqueued_time.tv_sec,
80 CURRENT_SECONDS - lock->l_enqueued_time.tv_sec,
81 obd2cli_tgt(obd), imp->imp_connection->c_remote_uuid.uuid);
86 int ldlm_completion_ast(struct ldlm_lock *lock, int flags, void *data)
88 /* XXX ALLOCATE - 160 bytes */
89 struct lock_wait_data lwd;
90 struct obd_device *obd;
91 struct obd_import *imp = NULL;
92 struct l_wait_info lwi;
96 if (flags == LDLM_FL_WAIT_NOREPROC) {
97 LDLM_DEBUG(lock, "client-side enqueue waiting on pending lock");
101 if (!(flags & (LDLM_FL_BLOCK_WAIT | LDLM_FL_BLOCK_GRANTED |
102 LDLM_FL_BLOCK_CONV))) {
103 cfs_waitq_signal(&lock->l_waitq);
107 LDLM_DEBUG(lock, "client-side enqueue returned a blocked lock, "
109 ldlm_lock_dump(D_OTHER, lock, 0);
110 ldlm_reprocess_all(lock->l_resource);
114 obd = class_exp2obd(lock->l_conn_export);
116 /* if this is a local lock, then there is no import */
118 imp = obd->u.cli.cl_import;
122 if (lock->l_flags & LDLM_FL_NO_TIMEOUT) {
123 LDLM_DEBUG(lock, "waiting indefinitely because of NO_TIMEOUT");
124 lwi = LWI_INTR(interrupted_completion_wait, &lwd);
126 lwi = LWI_TIMEOUT_INTR(cfs_time_seconds(obd_timeout),
127 ldlm_expired_completion_wait,
128 interrupted_completion_wait, &lwd);
132 spin_lock(&imp->imp_lock);
133 lwd.lwd_conn_cnt = imp->imp_conn_cnt;
134 spin_unlock(&imp->imp_lock);
137 /* Go to sleep until the lock is granted or cancelled. */
138 rc = l_wait_event(lock->l_waitq,
139 ((lock->l_req_mode == lock->l_granted_mode) ||
140 (lock->l_flags & LDLM_FL_FAILED)), &lwi);
142 if (lock->l_destroyed || lock->l_flags & LDLM_FL_FAILED) {
143 LDLM_DEBUG(lock, "client-side enqueue waking up: destroyed");
148 LDLM_DEBUG(lock, "client-side enqueue waking up: failed (%d)",
153 LDLM_DEBUG(lock, "client-side enqueue waking up: granted");
158 * ->l_blocking_ast() callback for LDLM locks acquired by server-side OBDs.
160 int ldlm_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
161 void *data, int flag)
166 if (flag == LDLM_CB_CANCELING) {
167 /* Don't need to do anything here. */
171 lock_res_and_lock(lock);
172 /* Get this: if ldlm_blocking_ast is racing with intent_policy, such
173 * that ldlm_blocking_ast is called just before intent_policy method
174 * takes the ns_lock, then by the time we get the lock, we might not
175 * be the correct blocking function anymore. So check, and return
177 if (lock->l_blocking_ast != ldlm_blocking_ast) {
178 unlock_res_and_lock(lock);
182 lock->l_flags |= LDLM_FL_CBPENDING;
183 do_ast = (!lock->l_readers && !lock->l_writers);
184 unlock_res_and_lock(lock);
187 struct lustre_handle lockh;
190 LDLM_DEBUG(lock, "already unused, calling ldlm_cli_cancel");
191 ldlm_lock2handle(lock, &lockh);
192 rc = ldlm_cli_cancel(&lockh);
194 CERROR("ldlm_cli_cancel: %d\n", rc);
196 LDLM_DEBUG(lock, "Lock still has references, will be "
203 * ->l_glimpse_ast() for DLM extent locks acquired on the server-side. See
204 * comment in filter_intent_policy() on why you may need this.
206 int ldlm_glimpse_ast(struct ldlm_lock *lock, void *reqp)
209 * Returning -ELDLM_NO_LOCK_DATA actually works, but the reason for
210 * that is rather subtle: with OST-side locking, it may so happen that
211 * _all_ extent locks are held by the OST. If client wants to obtain
212 * current file size it calls ll{,u}_glimpse_size(), and (as locks are
213 * on the server), dummy glimpse callback fires and does
214 * nothing. Client still receives correct file size due to the
215 * following fragment in filter_intent_policy():
217 * rc = l->l_glimpse_ast(l, NULL); // this will update the LVB
218 * if (rc != 0 && res->lr_namespace->ns_lvbo &&
219 * res->lr_namespace->ns_lvbo->lvbo_update) {
220 * res->lr_namespace->ns_lvbo->lvbo_update(res, NULL, 0, 1);
223 * that is, after glimpse_ast() fails, filter_lvbo_update() runs, and
224 * returns correct file size to the client.
226 return -ELDLM_NO_LOCK_DATA;
229 int ldlm_cli_enqueue_local(struct ldlm_namespace *ns,
230 const struct ldlm_res_id *res_id,
231 ldlm_type_t type, ldlm_policy_data_t *policy,
232 ldlm_mode_t mode, int *flags,
233 ldlm_blocking_callback blocking,
234 ldlm_completion_callback completion,
235 ldlm_glimpse_callback glimpse,
236 void *data, __u32 lvb_len, void *lvb_swabber,
237 struct lustre_handle *lockh)
239 struct ldlm_lock *lock;
243 LASSERT(!(*flags & LDLM_FL_REPLAY));
244 if (unlikely(ns->ns_client)) {
245 CERROR("Trying to enqueue local lock in a shadow namespace\n");
249 lock = ldlm_lock_create(ns, NULL, res_id, type, mode, blocking,
250 completion, glimpse, data, lvb_len);
252 GOTO(out_nolock, err = -ENOMEM);
253 LDLM_DEBUG(lock, "client-side local enqueue handler, new lock created");
255 ldlm_lock_addref_internal(lock, mode);
256 ldlm_lock2handle(lock, lockh);
257 lock_res_and_lock(lock);
258 lock->l_flags |= LDLM_FL_LOCAL;
259 if (*flags & LDLM_FL_ATOMIC_CB)
260 lock->l_flags |= LDLM_FL_ATOMIC_CB;
261 lock->l_lvb_swabber = lvb_swabber;
262 unlock_res_and_lock(lock);
264 lock->l_policy_data = *policy;
265 if (type == LDLM_EXTENT)
266 lock->l_req_extent = policy->l_extent;
268 err = ldlm_lock_enqueue(ns, &lock, policy, flags);
269 if (unlikely(err != ELDLM_OK))
273 *policy = lock->l_policy_data;
275 LDLM_DEBUG_NOLOCK("client-side local enqueue handler END (lock %p)",
278 if (lock->l_completion_ast)
279 lock->l_completion_ast(lock, *flags, NULL);
281 LDLM_DEBUG(lock, "client-side local enqueue END");
289 static void failed_lock_cleanup(struct ldlm_namespace *ns,
290 struct ldlm_lock *lock,
291 struct lustre_handle *lockh, int mode)
293 /* Set a flag to prevent us from sending a CANCEL (bug 407) */
294 lock_res_and_lock(lock);
295 lock->l_flags |= LDLM_FL_LOCAL_ONLY;
296 unlock_res_and_lock(lock);
297 LDLM_DEBUG(lock, "setting FL_LOCAL_ONLY");
299 ldlm_lock_decref_and_cancel(lockh, mode);
301 /* XXX - HACK because we shouldn't call ldlm_lock_destroy()
302 * from llite/file.c/ll_file_flock(). */
303 if (lock->l_resource->lr_type == LDLM_FLOCK) {
304 ldlm_lock_destroy(lock);
308 int ldlm_cli_enqueue_fini(struct obd_export *exp, struct ptlrpc_request *req,
309 ldlm_type_t type, __u8 with_policy, ldlm_mode_t mode,
310 int *flags, void *lvb, __u32 lvb_len,
311 void *lvb_swabber, struct lustre_handle *lockh,int rc)
313 struct ldlm_namespace *ns = exp->exp_obd->obd_namespace;
314 int is_replay = *flags & LDLM_FL_REPLAY;
315 struct ldlm_lock *lock;
316 struct ldlm_reply *reply;
317 int cleanup_phase = 1;
320 lock = ldlm_handle2lock(lockh);
321 /* ldlm_cli_enqueue is holding a reference on this lock. */
322 LASSERT(lock != NULL);
323 if (rc != ELDLM_OK) {
325 LDLM_DEBUG(lock, "client-side enqueue END (%s)",
326 rc == ELDLM_LOCK_ABORTED ? "ABORTED" : "FAILED");
327 if (rc == ELDLM_LOCK_ABORTED) {
328 /* Before we return, swab the reply */
329 reply = lustre_swab_repbuf(req, DLM_LOCKREPLY_OFF,
331 lustre_swab_ldlm_reply);
333 CERROR("Can't unpack ldlm_reply\n");
338 tmplvb = lustre_swab_repbuf(req,
343 GOTO(cleanup, rc = -EPROTO);
345 memcpy(lvb, tmplvb, lvb_len);
351 reply = lustre_swab_repbuf(req, DLM_LOCKREPLY_OFF, sizeof(*reply),
352 lustre_swab_ldlm_reply);
354 CERROR("Can't unpack ldlm_reply\n");
355 GOTO(cleanup, rc = -EPROTO);
358 /* lock enqueued on the server */
361 lock_res_and_lock(lock);
362 lock->l_remote_handle = reply->lock_handle;
363 *flags = reply->lock_flags;
364 lock->l_flags |= reply->lock_flags & LDLM_INHERIT_FLAGS;
365 /* move NO_TIMEOUT flag to the lock to force ldlm_lock_match()
366 * to wait with no timeout as well */
367 lock->l_flags |= reply->lock_flags & LDLM_FL_NO_TIMEOUT;
368 unlock_res_and_lock(lock);
370 CDEBUG(D_INFO, "local: %p, remote cookie: "LPX64", flags: 0x%x\n",
371 lock, reply->lock_handle.cookie, *flags);
373 /* If enqueue returned a blocked lock but the completion handler has
374 * already run, then it fixed up the resource and we don't need to do it
376 if ((*flags) & LDLM_FL_LOCK_CHANGED) {
377 int newmode = reply->lock_desc.l_req_mode;
379 if (newmode && newmode != lock->l_req_mode) {
380 LDLM_DEBUG(lock, "server returned different mode %s",
381 ldlm_lockname[newmode]);
382 lock->l_req_mode = newmode;
385 if (memcmp(reply->lock_desc.l_resource.lr_name.name,
386 lock->l_resource->lr_name.name,
387 sizeof(struct ldlm_res_id))) {
388 CDEBUG(D_INFO, "remote intent success, locking "
389 "(%ld,%ld,%ld) instead of "
391 (long)reply->lock_desc.l_resource.lr_name.name[0],
392 (long)reply->lock_desc.l_resource.lr_name.name[1],
393 (long)reply->lock_desc.l_resource.lr_name.name[2],
394 (long)lock->l_resource->lr_name.name[0],
395 (long)lock->l_resource->lr_name.name[1],
396 (long)lock->l_resource->lr_name.name[2]);
398 ldlm_lock_change_resource(ns, lock,
399 &reply->lock_desc.l_resource.lr_name);
400 if (lock->l_resource == NULL) {
402 GOTO(cleanup, rc = -ENOMEM);
404 LDLM_DEBUG(lock, "client-side enqueue, new resource");
407 if (!(type == LDLM_IBITS && !(exp->exp_connect_flags &
409 lock->l_policy_data =
410 reply->lock_desc.l_policy_data;
411 if (type != LDLM_PLAIN)
412 LDLM_DEBUG(lock,"client-side enqueue, new policy data");
415 if ((*flags) & LDLM_FL_AST_SENT ||
416 /* Cancel extent locks as soon as possible on a liblustre client,
417 * because it cannot handle asynchronous ASTs robustly (see
419 (LIBLUSTRE_CLIENT && type == LDLM_EXTENT)) {
420 lock_res_and_lock(lock);
421 lock->l_flags |= LDLM_FL_CBPENDING;
422 unlock_res_and_lock(lock);
423 LDLM_DEBUG(lock, "enqueue reply includes blocking AST");
426 /* If the lock has already been granted by a completion AST, don't
427 * clobber the LVB with an older one. */
428 if (lvb_len && (lock->l_req_mode != lock->l_granted_mode)) {
430 tmplvb = lustre_swab_repbuf(req, DLM_REPLY_REC_OFF, lvb_len,
433 GOTO(cleanup, rc = -EPROTO);
434 memcpy(lock->l_lvb_data, tmplvb, lvb_len);
438 rc = ldlm_lock_enqueue(ns, &lock, NULL, flags);
439 if (lock->l_completion_ast != NULL) {
440 int err = lock->l_completion_ast(lock, *flags, NULL);
443 if (rc && type != LDLM_FLOCK) /* bug 9425, bug 10250 */
448 if (lvb_len && lvb != NULL) {
449 /* Copy the LVB here, and not earlier, because the completion
450 * AST (if any) can override what we got in the reply */
451 memcpy(lvb, lock->l_lvb_data, lvb_len);
454 LDLM_DEBUG(lock, "client-side enqueue END");
457 if (cleanup_phase == 1 && rc)
458 failed_lock_cleanup(ns, lock, lockh, mode);
459 /* Put lock 2 times, the second reference is held by ldlm_cli_enqueue */
465 /* If a request has some specific initialisation it is passed in @reqp,
466 * otherwise it is created in ldlm_cli_enqueue.
468 * Supports sync and async requests, pass @async flag accordingly. If a
469 * request was created in ldlm_cli_enqueue and it is the async request,
470 * pass it to the caller in @reqp. */
471 int ldlm_cli_enqueue(struct obd_export *exp, struct ptlrpc_request **reqp,
472 const struct ldlm_res_id *res_id,
473 ldlm_type_t type, ldlm_policy_data_t *policy,
474 ldlm_mode_t mode, int *flags,
475 ldlm_blocking_callback blocking,
476 ldlm_completion_callback completion,
477 ldlm_glimpse_callback glimpse,
478 void *data, void *lvb, __u32 lvb_len, void *lvb_swabber,
479 struct lustre_handle *lockh, int async)
481 struct ldlm_namespace *ns = exp->exp_obd->obd_namespace;
482 struct ldlm_lock *lock;
483 struct ldlm_request *body;
484 struct ldlm_reply *reply;
485 int size[3] = { [MSG_PTLRPC_BODY_OFF] = sizeof(struct ptlrpc_body),
486 [DLM_LOCKREQ_OFF] = sizeof(*body),
487 [DLM_REPLY_REC_OFF] = lvb_len };
488 int is_replay = *flags & LDLM_FL_REPLAY;
489 int req_passed_in = 1, rc;
490 struct ptlrpc_request *req;
493 LASSERT(exp != NULL);
495 /* If we're replaying this lock, just check some invariants.
496 * If we're creating a new lock, get everything all setup nice. */
498 lock = ldlm_handle2lock(lockh);
499 LASSERT(lock != NULL);
500 LDLM_DEBUG(lock, "client-side enqueue START");
501 LASSERT(exp == lock->l_conn_export);
503 lock = ldlm_lock_create(ns, NULL, res_id, type, mode, blocking,
504 completion, glimpse, data, lvb_len);
507 /* for the local lock, add the reference */
508 ldlm_lock_addref_internal(lock, mode);
509 ldlm_lock2handle(lock, lockh);
510 lock->l_lvb_swabber = lvb_swabber;
511 if (policy != NULL) {
512 /* INODEBITS_INTEROP: If the server does not support
513 * inodebits, we will request a plain lock in the
514 * descriptor (ldlm_lock2desc() below) but use an
515 * inodebits lock internally with both bits set.
517 if (type == LDLM_IBITS && !(exp->exp_connect_flags &
519 lock->l_policy_data.l_inodebits.bits =
520 MDS_INODELOCK_LOOKUP |
521 MDS_INODELOCK_UPDATE;
523 lock->l_policy_data = *policy;
526 if (type == LDLM_EXTENT)
527 lock->l_req_extent = policy->l_extent;
528 LDLM_DEBUG(lock, "client-side enqueue START");
531 /* lock not sent to server yet */
533 if (reqp == NULL || *reqp == NULL) {
534 req = ptlrpc_prep_req(class_exp2cliimp(exp), LUSTRE_DLM_VERSION,
535 LDLM_ENQUEUE, 2, size, NULL);
537 failed_lock_cleanup(ns, lock, lockh, mode);
546 LASSERTF(lustre_msg_buflen(req->rq_reqmsg, DLM_LOCKREQ_OFF) ==
547 sizeof(*body), "buflen[%d] = %d, not "LPSZ"\n",
549 lustre_msg_buflen(req->rq_reqmsg, DLM_LOCKREQ_OFF),
553 lock->l_conn_export = exp;
554 lock->l_export = NULL;
555 lock->l_blocking_ast = blocking;
557 /* Dump lock data into the request buffer */
558 body = lustre_msg_buf(req->rq_reqmsg, DLM_LOCKREQ_OFF, sizeof(*body));
559 ldlm_lock2desc(lock, &body->lock_desc);
560 body->lock_flags = *flags;
561 body->lock_handle1 = *lockh;
563 /* Continue as normal. */
564 if (!req_passed_in) {
565 size[DLM_LOCKREPLY_OFF] = sizeof(*reply);
566 ptlrpc_req_set_repsize(req, 2 + (lvb_len > 0), size);
570 * Liblustre client doesn't get extent locks, except for O_APPEND case
571 * where [0, OBD_OBJECT_EOF] lock is taken, or truncate, where
572 * [i_size, OBD_OBJECT_EOF] lock is taken.
574 LASSERT(ergo(LIBLUSTRE_CLIENT, type != LDLM_EXTENT ||
575 policy->l_extent.end == OBD_OBJECT_EOF));
578 LASSERT(reqp != NULL);
582 LDLM_DEBUG(lock, "sending request");
583 rc = ptlrpc_queue_wait(req);
584 rc = ldlm_cli_enqueue_fini(exp, req, type, policy ? 1 : 0,
585 mode, flags, lvb, lvb_len, lvb_swabber,
588 if (!req_passed_in && req != NULL) {
589 ptlrpc_req_finished(req);
597 static int ldlm_cli_convert_local(struct ldlm_lock *lock, int new_mode,
600 struct ldlm_resource *res;
603 if (lock->l_resource->lr_namespace->ns_client) {
604 CERROR("Trying to cancel local lock\n");
607 LDLM_DEBUG(lock, "client-side local convert");
609 res = ldlm_lock_convert(lock, new_mode, flags);
611 ldlm_reprocess_all(res);
616 LDLM_DEBUG(lock, "client-side local convert handler END");
621 /* FIXME: one of ldlm_cli_convert or the server side should reject attempted
622 * conversion of locks which are on the waiting or converting queue */
623 /* Caller of this code is supposed to take care of lock readers/writers
625 int ldlm_cli_convert(struct lustre_handle *lockh, int new_mode, int *flags)
627 struct ldlm_request *body;
628 struct ldlm_reply *reply;
629 struct ldlm_lock *lock;
630 struct ldlm_resource *res;
631 struct ptlrpc_request *req;
632 int size[2] = { [MSG_PTLRPC_BODY_OFF] = sizeof(struct ptlrpc_body),
633 [DLM_LOCKREQ_OFF] = sizeof(*body) };
637 lock = ldlm_handle2lock(lockh);
644 if (lock->l_conn_export == NULL)
645 RETURN(ldlm_cli_convert_local(lock, new_mode, flags));
647 LDLM_DEBUG(lock, "client-side convert");
649 req = ptlrpc_prep_req(class_exp2cliimp(lock->l_conn_export),
650 LUSTRE_DLM_VERSION, LDLM_CONVERT, 2, size, NULL);
652 GOTO(out, rc = -ENOMEM);
654 body = lustre_msg_buf(req->rq_reqmsg, DLM_LOCKREQ_OFF, sizeof(*body));
655 body->lock_handle1 = lock->l_remote_handle;
657 body->lock_desc.l_req_mode = new_mode;
658 body->lock_flags = *flags;
660 size[DLM_LOCKREPLY_OFF] = sizeof(*reply);
661 ptlrpc_req_set_repsize(req, 2, size);
663 rc = ptlrpc_queue_wait(req);
667 reply = lustre_swab_repbuf(req, DLM_LOCKREPLY_OFF, sizeof(*reply),
668 lustre_swab_ldlm_reply);
670 CERROR ("Can't unpack ldlm_reply\n");
671 GOTO (out, rc = -EPROTO);
675 GOTO(out, rc = req->rq_status);
677 res = ldlm_lock_convert(lock, new_mode, &reply->lock_flags);
679 ldlm_reprocess_all(res);
680 /* Go to sleep until the lock is granted. */
681 /* FIXME: or cancelled. */
682 if (lock->l_completion_ast) {
683 rc = lock->l_completion_ast(lock, LDLM_FL_WAIT_NOREPROC,
694 ptlrpc_req_finished(req);
698 int ldlm_cli_cancel(struct lustre_handle *lockh)
700 struct ptlrpc_request *req;
701 struct ldlm_lock *lock;
702 struct ldlm_request *body;
703 int size[2] = { [MSG_PTLRPC_BODY_OFF] = sizeof(struct ptlrpc_body),
704 [DLM_LOCKREQ_OFF] = sizeof(*body) };
708 /* concurrent cancels on the same handle can happen */
709 lock = __ldlm_handle2lock(lockh, LDLM_FL_CANCELING);
713 if (lock->l_conn_export) {
715 struct obd_import *imp;
717 LDLM_DEBUG(lock, "client-side cancel");
718 /* Set this flag to prevent others from getting new references*/
719 lock_res_and_lock(lock);
720 lock->l_flags |= LDLM_FL_CBPENDING;
721 local_only = (lock->l_flags &
722 (LDLM_FL_LOCAL_ONLY|LDLM_FL_CANCEL_ON_BLOCK));
723 ldlm_cancel_callback(lock);
724 unlock_res_and_lock(lock);
727 CDEBUG(D_INFO, "not sending request (at caller's "
733 imp = class_exp2cliimp(lock->l_conn_export);
734 if (imp == NULL || imp->imp_invalid) {
735 CDEBUG(D_HA, "skipping cancel on invalid import %p\n",
740 req = ptlrpc_prep_req(imp, LUSTRE_DLM_VERSION, LDLM_CANCEL, 2,
743 GOTO(out, rc = -ENOMEM);
744 req->rq_no_resend = 1;
746 /* XXX FIXME bug 249 */
747 req->rq_request_portal = LDLM_CANCEL_REQUEST_PORTAL;
748 req->rq_reply_portal = LDLM_CANCEL_REPLY_PORTAL;
750 body = lustre_msg_buf(req->rq_reqmsg, DLM_LOCKREQ_OFF,
752 body->lock_handle1 = lock->l_remote_handle;
754 ptlrpc_req_set_repsize(req, 1, NULL);
755 rc = ptlrpc_queue_wait(req);
758 CDEBUG(D_DLMTRACE, "client/server (nid %s) out of sync "
759 "-- not fatal, flags %x\n",
760 libcfs_nid2str(req->rq_import->
761 imp_connection->c_peer.nid),
763 } else if (rc == -ETIMEDOUT) {
764 ptlrpc_req_finished(req);
766 } else if (rc != ELDLM_OK) {
767 CERROR("Got rc %d from cancel RPC: canceling "
771 ptlrpc_req_finished(req);
773 ldlm_lock_cancel(lock);
775 if (lock->l_resource->lr_namespace->ns_client) {
776 LDLM_ERROR(lock, "Trying to cancel local lock");
779 LDLM_DEBUG(lock, "client-side local cancel");
780 ldlm_lock_cancel(lock);
781 ldlm_reprocess_all(lock->l_resource);
782 LDLM_DEBUG(lock, "client-side local cancel handler END");
791 /* when called with LDLM_ASYNC the blocking callback will be handled
792 * in a thread and this function will return after the thread has been
793 * asked to call the callback. when called with LDLM_SYNC the blocking
794 * callback will be performed in this function. */
795 int ldlm_cancel_lru(struct ldlm_namespace *ns, ldlm_sync_t sync)
797 struct ldlm_lock *lock, *next;
799 CFS_LIST_HEAD(cblist);
803 sync = LDLM_SYNC; /* force to be sync in user space */
806 spin_lock(&ns->ns_unused_lock);
807 count = ns->ns_nr_unused - ns->ns_max_unused;
810 spin_unlock(&ns->ns_unused_lock);
814 while (!list_empty(&ns->ns_unused_list)) {
815 struct list_head *tmp = ns->ns_unused_list.next;
816 lock = list_entry(tmp, struct ldlm_lock, l_lru);
817 LASSERT(!lock->l_readers && !lock->l_writers);
819 LDLM_LOCK_GET(lock); /* dropped by bl thread */
820 spin_unlock(&ns->ns_unused_lock);
822 lock_res_and_lock(lock);
823 if (ldlm_lock_remove_from_lru(lock) == 0) {
824 /* other thread is removing lock from lru */
825 unlock_res_and_lock(lock);
827 spin_lock(&ns->ns_unused_lock);
832 /* If we have chosen to canecl this lock voluntarily, we better
833 send cancel notification to server, so that it frees
834 appropriate state. This might lead to a race where while
835 we are doing cancel here, server is also silently
836 cancelling this lock. */
837 lock->l_flags &= ~LDLM_FL_CANCEL_ON_BLOCK;
839 /* Setting the CBPENDING flag is a little misleading, but
840 * prevents an important race; namely, once CBPENDING is set,
841 * the lock can accumulate no more readers/writers. Since
842 * readers and writers are already zero here, ldlm_lock_decref
843 * won't see this flag and call l_blocking_ast */
844 lock->l_flags |= LDLM_FL_CBPENDING;
846 /* We can't re-add to l_lru as it confuses the refcounting in
847 * ldlm_lock_remove_from_lru() if an AST arrives after we drop
848 * ns_lock below. We use l_tmp and can't use l_pending_chain as
849 * it is used both on server and client nevertheles bug 5666
850 * says it is used only on server. --umka */
851 list_add(&lock->l_tmp, &cblist);
852 unlock_res_and_lock(lock);
854 LDLM_LOCK_GET(lock); /* to hold lock after bl thread */
855 if (sync == LDLM_ASYNC && (ldlm_bl_to_thread(ns, NULL, lock) == 0)) {
856 lock_res_and_lock(lock);
857 list_del_init(&lock->l_tmp);
858 unlock_res_and_lock(lock);
862 spin_lock(&ns->ns_unused_lock);
867 spin_unlock(&ns->ns_unused_lock);
869 list_for_each_entry_safe(lock, next, &cblist, l_tmp) {
870 list_del_init(&lock->l_tmp);
871 ldlm_handle_bl_callback(ns, NULL, lock);
877 static int ldlm_cli_cancel_unused_resource(struct ldlm_namespace *ns,
878 const struct ldlm_res_id *res_id,
879 int flags, void *opaque)
881 struct list_head *tmp, *next, list = CFS_LIST_HEAD_INIT(list);
882 struct ldlm_resource *res;
883 struct ldlm_lock *lock;
886 res = ldlm_resource_get(ns, NULL, res_id, 0, 0);
888 /* This is not a problem. */
889 CDEBUG(D_INFO, "No resource "LPU64"\n", res_id->name[0]);
894 list_for_each(tmp, &res->lr_granted) {
895 lock = list_entry(tmp, struct ldlm_lock, l_res_link);
897 if (opaque != NULL && lock->l_ast_data != opaque) {
898 LDLM_ERROR(lock, "data %p doesn't match opaque %p",
899 lock->l_ast_data, opaque);
904 if (lock->l_readers || lock->l_writers) {
905 if (flags & LDLM_FL_WARN) {
906 LDLM_ERROR(lock, "lock in use");
912 /* See CBPENDING comment in ldlm_cancel_lru */
913 lock->l_flags |= LDLM_FL_CBPENDING;
915 LASSERT(list_empty(&lock->l_bl_ast));
916 list_add(&lock->l_bl_ast, &list);
921 list_for_each_safe(tmp, next, &list) {
922 struct lustre_handle lockh;
924 lock = list_entry(tmp, struct ldlm_lock, l_bl_ast);
926 if (flags & LDLM_FL_LOCAL_ONLY) {
927 ldlm_lock_cancel(lock);
929 ldlm_lock2handle(lock, &lockh);
930 rc = ldlm_cli_cancel(&lockh);
932 CERROR("ldlm_cli_cancel: %d\n", rc);
934 list_del_init(&lock->l_bl_ast);
938 ldlm_resource_putref(res);
943 static inline int have_no_nsresource(struct ldlm_namespace *ns)
947 spin_lock(&ns->ns_hash_lock);
948 if (ns->ns_resources == 0)
950 spin_unlock(&ns->ns_hash_lock);
955 /* Cancel all locks on a namespace (or a specific resource, if given)
956 * that have 0 readers/writers.
958 * If flags & LDLM_FL_LOCAL_ONLY, throw the locks away without trying
959 * to notify the server.
960 * If flags & LDLM_FL_WARN, print a warning if some locks are still in use. */
961 int ldlm_cli_cancel_unused(struct ldlm_namespace *ns,
962 const struct ldlm_res_id *res_id,
963 int flags, void *opaque)
972 RETURN(ldlm_cli_cancel_unused_resource(ns, res_id, flags,
975 spin_lock(&ns->ns_hash_lock);
976 for (i = 0; i < RES_HASH_SIZE; i++) {
977 struct list_head *tmp;
978 tmp = ns->ns_hash[i].next;
979 while (tmp != &(ns->ns_hash[i])) {
980 struct ldlm_resource *res;
983 res = list_entry(tmp, struct ldlm_resource, lr_hash);
984 ldlm_resource_getref(res);
985 spin_unlock(&ns->ns_hash_lock);
987 rc = ldlm_cli_cancel_unused_resource(ns, &res->lr_name,
991 CERROR("cancel_unused_res ("LPU64"): %d\n",
992 res->lr_name.name[0], rc);
994 spin_lock(&ns->ns_hash_lock);
996 ldlm_resource_putref_locked(res);
999 spin_unlock(&ns->ns_hash_lock);
1004 /* join/split resource locks to/from lru list */
1005 int ldlm_cli_join_lru(struct ldlm_namespace *ns,
1006 const struct ldlm_res_id *res_id, int join)
1008 struct ldlm_resource *res;
1009 struct ldlm_lock *lock, *n;
1013 LASSERT(ns->ns_client == LDLM_NAMESPACE_CLIENT);
1015 res = ldlm_resource_get(ns, NULL, res_id, LDLM_EXTENT, 0);
1018 LASSERT(res->lr_type == LDLM_EXTENT);
1024 list_for_each_entry_safe (lock, n, &res->lr_granted, l_res_link) {
1025 if (list_empty(&lock->l_lru) &&
1026 !lock->l_readers && !lock->l_writers &&
1027 !(lock->l_flags & LDLM_FL_LOCAL) &&
1028 !(lock->l_flags & LDLM_FL_CBPENDING)) {
1029 spin_lock(&ns->ns_unused_lock);
1030 LASSERT(ns->ns_nr_unused >= 0);
1031 list_add_tail(&lock->l_lru, &ns->ns_unused_list);
1033 spin_unlock(&ns->ns_unused_lock);
1034 lock->l_flags &= ~LDLM_FL_NO_LRU;
1035 LDLM_DEBUG(lock, "join lock to lru");
1041 spin_lock(&ns->ns_unused_lock);
1042 list_for_each_entry_safe (lock, n, &ns->ns_unused_list, l_lru) {
1043 if (lock->l_resource == res) {
1044 ldlm_lock_remove_from_lru_nolock(lock);
1045 lock->l_flags |= LDLM_FL_NO_LRU;
1046 LDLM_DEBUG(lock, "split lock from lru");
1050 spin_unlock(&ns->ns_unused_lock);
1053 ldlm_resource_putref(res);
1057 /* Lock iterators. */
1059 int ldlm_resource_foreach(struct ldlm_resource *res, ldlm_iterator_t iter,
1062 struct list_head *tmp, *next;
1063 struct ldlm_lock *lock;
1064 int rc = LDLM_ITER_CONTINUE;
1069 RETURN(LDLM_ITER_CONTINUE);
1072 list_for_each_safe(tmp, next, &res->lr_granted) {
1073 lock = list_entry(tmp, struct ldlm_lock, l_res_link);
1075 if (iter(lock, closure) == LDLM_ITER_STOP)
1076 GOTO(out, rc = LDLM_ITER_STOP);
1079 list_for_each_safe(tmp, next, &res->lr_converting) {
1080 lock = list_entry(tmp, struct ldlm_lock, l_res_link);
1082 if (iter(lock, closure) == LDLM_ITER_STOP)
1083 GOTO(out, rc = LDLM_ITER_STOP);
1086 list_for_each_safe(tmp, next, &res->lr_waiting) {
1087 lock = list_entry(tmp, struct ldlm_lock, l_res_link);
1089 if (iter(lock, closure) == LDLM_ITER_STOP)
1090 GOTO(out, rc = LDLM_ITER_STOP);
1097 struct iter_helper_data {
1098 ldlm_iterator_t iter;
1102 static int ldlm_iter_helper(struct ldlm_lock *lock, void *closure)
1104 struct iter_helper_data *helper = closure;
1105 return helper->iter(lock, helper->closure);
1108 static int ldlm_res_iter_helper(struct ldlm_resource *res, void *closure)
1110 return ldlm_resource_foreach(res, ldlm_iter_helper, closure);
1113 int ldlm_namespace_foreach(struct ldlm_namespace *ns, ldlm_iterator_t iter,
1116 struct iter_helper_data helper = { iter: iter, closure: closure };
1117 return ldlm_namespace_foreach_res(ns, ldlm_res_iter_helper, &helper);
1120 int ldlm_namespace_foreach_res(struct ldlm_namespace *ns,
1121 ldlm_res_iterator_t iter, void *closure)
1123 int i, rc = LDLM_ITER_CONTINUE;
1124 struct ldlm_resource *res;
1125 struct list_head *tmp;
1128 spin_lock(&ns->ns_hash_lock);
1129 for (i = 0; i < RES_HASH_SIZE; i++) {
1130 tmp = ns->ns_hash[i].next;
1131 while (tmp != &(ns->ns_hash[i])) {
1132 res = list_entry(tmp, struct ldlm_resource, lr_hash);
1133 ldlm_resource_getref(res);
1134 spin_unlock(&ns->ns_hash_lock);
1136 rc = iter(res, closure);
1138 spin_lock(&ns->ns_hash_lock);
1140 ldlm_resource_putref_locked(res);
1141 if (rc == LDLM_ITER_STOP)
1146 spin_unlock(&ns->ns_hash_lock);
1150 /* non-blocking function to manipulate a lock whose cb_data is being put away.*/
1151 void ldlm_resource_iterate(struct ldlm_namespace *ns,
1152 const struct ldlm_res_id *res_id,
1153 ldlm_iterator_t iter, void *data)
1155 struct ldlm_resource *res;
1159 CERROR("must pass in namespace\n");
1163 res = ldlm_resource_get(ns, NULL, res_id, 0, 0);
1169 ldlm_resource_foreach(res, iter, data);
1170 ldlm_resource_putref(res);
1176 static int ldlm_chain_lock_for_replay(struct ldlm_lock *lock, void *closure)
1178 struct list_head *list = closure;
1180 /* we use l_pending_chain here, because it's unused on clients. */
1181 LASSERTF(list_empty(&lock->l_pending_chain),"lock %p next %p prev %p\n",
1182 lock, &lock->l_pending_chain.next,&lock->l_pending_chain.prev);
1183 /* bug 9573: don't replay locks left after eviction */
1184 if (!(lock->l_flags & LDLM_FL_FAILED))
1185 list_add(&lock->l_pending_chain, list);
1186 return LDLM_ITER_CONTINUE;
1189 static int replay_lock_interpret(struct ptlrpc_request *req,
1190 void * data, int rc)
1192 struct ldlm_lock *lock;
1193 struct ldlm_reply *reply;
1196 atomic_dec(&req->rq_import->imp_replay_inflight);
1200 lock = req->rq_async_args.pointer_arg[0];
1201 LASSERT(lock != NULL);
1203 reply = lustre_swab_repbuf(req, DLM_LOCKREPLY_OFF, sizeof(*reply),
1204 lustre_swab_ldlm_reply);
1205 if (reply == NULL) {
1206 CERROR("Can't unpack ldlm_reply\n");
1207 GOTO (out, rc = -EPROTO);
1210 lock->l_remote_handle = reply->lock_handle;
1211 LDLM_DEBUG(lock, "replayed lock:");
1212 ptlrpc_import_recovery_state_machine(req->rq_import);
1215 ptlrpc_connect_import(req->rq_import, NULL);
1221 static int replay_one_lock(struct obd_import *imp, struct ldlm_lock *lock)
1223 struct ptlrpc_request *req;
1224 struct ldlm_request *body;
1225 struct ldlm_reply *reply;
1227 int size[3] = { sizeof(struct ptlrpc_body) };
1231 /* If this is reply-less callback lock, we cannot replay it, since
1232 * server might have long dropped it, but notification of that event was
1233 * lost by network. (and server granted conflicting lock already) */
1234 if (lock->l_flags & LDLM_FL_CANCEL_ON_BLOCK) {
1235 LDLM_DEBUG(lock, "Not replaying reply-less lock:");
1236 ldlm_lock_cancel(lock);
1240 * If granted mode matches the requested mode, this lock is granted.
1242 * If they differ, but we have a granted mode, then we were granted
1243 * one mode and now want another: ergo, converting.
1245 * If we haven't been granted anything and are on a resource list,
1246 * then we're blocked/waiting.
1248 * If we haven't been granted anything and we're NOT on a resource list,
1249 * then we haven't got a reply yet and don't have a known disposition.
1250 * This happens whenever a lock enqueue is the request that triggers
1253 if (lock->l_granted_mode == lock->l_req_mode)
1254 flags = LDLM_FL_REPLAY | LDLM_FL_BLOCK_GRANTED;
1255 else if (lock->l_granted_mode)
1256 flags = LDLM_FL_REPLAY | LDLM_FL_BLOCK_CONV;
1257 else if (!list_empty(&lock->l_res_link))
1258 flags = LDLM_FL_REPLAY | LDLM_FL_BLOCK_WAIT;
1260 flags = LDLM_FL_REPLAY;
1262 size[DLM_LOCKREQ_OFF] = sizeof(*body);
1263 req = ptlrpc_prep_req(imp, LUSTRE_DLM_VERSION, LDLM_ENQUEUE, 2, size,
1268 /* We're part of recovery, so don't wait for it. */
1269 req->rq_send_state = LUSTRE_IMP_REPLAY_LOCKS;
1271 body = lustre_msg_buf(req->rq_reqmsg, DLM_LOCKREQ_OFF, sizeof(*body));
1272 ldlm_lock2desc(lock, &body->lock_desc);
1273 body->lock_flags = flags;
1275 ldlm_lock2handle(lock, &body->lock_handle1);
1276 size[DLM_LOCKREPLY_OFF] = sizeof(*reply);
1277 if (lock->l_lvb_len != 0) {
1279 size[DLM_REPLY_REC_OFF] = lock->l_lvb_len;
1281 ptlrpc_req_set_repsize(req, buffers, size);
1282 /* notify the server we've replayed all requests.
1283 * also, we mark the request to be put on a dedicated
1284 * queue to be processed after all request replayes.
1286 lustre_msg_set_flags(req->rq_reqmsg, MSG_REQ_REPLAY_DONE);
1288 LDLM_DEBUG(lock, "replaying lock:");
1290 atomic_inc(&req->rq_import->imp_replay_inflight);
1291 req->rq_async_args.pointer_arg[0] = lock;
1292 req->rq_interpret_reply = replay_lock_interpret;
1293 ptlrpcd_add_req(req);
1298 int ldlm_replay_locks(struct obd_import *imp)
1300 struct ldlm_namespace *ns = imp->imp_obd->obd_namespace;
1301 struct list_head list;
1302 struct ldlm_lock *lock, *next;
1306 CFS_INIT_LIST_HEAD(&list);
1308 LASSERT(atomic_read(&imp->imp_replay_inflight) == 0);
1310 /* ensure this doesn't fall to 0 before all have been queued */
1311 atomic_inc(&imp->imp_replay_inflight);
1313 (void)ldlm_namespace_foreach(ns, ldlm_chain_lock_for_replay, &list);
1315 list_for_each_entry_safe(lock, next, &list, l_pending_chain) {
1316 list_del_init(&lock->l_pending_chain);
1318 continue; /* or try to do the rest? */
1319 rc = replay_one_lock(imp, lock);
1322 atomic_dec(&imp->imp_replay_inflight);