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 struct ldlm_async_args {
47 struct lustre_handle lock_handle;
50 int ldlm_expired_completion_wait(void *data)
52 struct lock_wait_data *lwd = data;
53 struct ldlm_lock *lock = lwd->lwd_lock;
54 struct obd_import *imp;
55 struct obd_device *obd;
58 if (lock->l_conn_export == NULL) {
59 static cfs_time_t next_dump = 0, last_dump = 0;
61 if (ptlrpc_check_suspend())
64 LDLM_ERROR(lock, "lock timed out (enqueued at %lu, %lus ago); "
65 "not entering recovery in server code, just going "
66 "back to sleep", lock->l_enqueued_time.tv_sec,
67 CURRENT_SECONDS - lock->l_enqueued_time.tv_sec);
68 if (cfs_time_after(cfs_time_current(), next_dump)) {
69 last_dump = next_dump;
70 next_dump = cfs_time_shift(300);
71 ldlm_namespace_dump(D_DLMTRACE,
72 lock->l_resource->lr_namespace);
74 libcfs_debug_dumplog();
79 obd = lock->l_conn_export->exp_obd;
80 imp = obd->u.cli.cl_import;
81 ptlrpc_fail_import(imp, lwd->lwd_conn_cnt);
82 LDLM_ERROR(lock, "lock timed out (enqueued at %lu, %lus ago), entering "
83 "recovery for %s@%s", lock->l_enqueued_time.tv_sec,
84 CURRENT_SECONDS - lock->l_enqueued_time.tv_sec,
85 obd2cli_tgt(obd), imp->imp_connection->c_remote_uuid.uuid);
90 static int is_granted_or_cancelled(struct ldlm_lock *lock)
94 lock_res_and_lock(lock);
95 if (((lock->l_req_mode == lock->l_granted_mode) &&
96 !(lock->l_flags & LDLM_FL_CP_REQD)) ||
97 (lock->l_flags & LDLM_FL_FAILED))
99 unlock_res_and_lock(lock);
104 int ldlm_completion_ast(struct ldlm_lock *lock, int flags, void *data)
106 /* XXX ALLOCATE - 160 bytes */
107 struct lock_wait_data lwd;
108 struct obd_device *obd;
109 struct obd_import *imp = NULL;
110 struct l_wait_info lwi;
114 if (flags == LDLM_FL_WAIT_NOREPROC) {
115 LDLM_DEBUG(lock, "client-side enqueue waiting on pending lock");
119 if (!(flags & (LDLM_FL_BLOCK_WAIT | LDLM_FL_BLOCK_GRANTED |
120 LDLM_FL_BLOCK_CONV))) {
121 cfs_waitq_signal(&lock->l_waitq);
125 LDLM_DEBUG(lock, "client-side enqueue returned a blocked lock, "
127 ldlm_lock_dump(D_OTHER, lock, 0);
128 ldlm_reprocess_all(lock->l_resource);
132 obd = class_exp2obd(lock->l_conn_export);
134 /* if this is a local lock, then there is no import */
136 imp = obd->u.cli.cl_import;
140 if (lock->l_flags & LDLM_FL_NO_TIMEOUT) {
141 LDLM_DEBUG(lock, "waiting indefinitely because of NO_TIMEOUT");
142 lwi = LWI_INTR(interrupted_completion_wait, &lwd);
144 lwi = LWI_TIMEOUT_INTR(cfs_time_seconds(obd_timeout),
145 ldlm_expired_completion_wait,
146 interrupted_completion_wait, &lwd);
150 spin_lock(&imp->imp_lock);
151 lwd.lwd_conn_cnt = imp->imp_conn_cnt;
152 spin_unlock(&imp->imp_lock);
155 /* Go to sleep until the lock is granted or cancelled. */
156 rc = l_wait_event(lock->l_waitq, is_granted_or_cancelled(lock), &lwi);
158 if (lock->l_destroyed || lock->l_flags & LDLM_FL_FAILED) {
159 LDLM_DEBUG(lock, "client-side enqueue waking up: destroyed");
164 LDLM_DEBUG(lock, "client-side enqueue waking up: failed (%d)",
169 LDLM_DEBUG(lock, "client-side enqueue waking up: granted");
174 * ->l_blocking_ast() callback for LDLM locks acquired by server-side OBDs.
176 int ldlm_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
177 void *data, int flag)
182 if (flag == LDLM_CB_CANCELING) {
183 /* Don't need to do anything here. */
187 lock_res_and_lock(lock);
188 /* Get this: if ldlm_blocking_ast is racing with intent_policy, such
189 * that ldlm_blocking_ast is called just before intent_policy method
190 * takes the ns_lock, then by the time we get the lock, we might not
191 * be the correct blocking function anymore. So check, and return
193 if (lock->l_blocking_ast != ldlm_blocking_ast) {
194 unlock_res_and_lock(lock);
198 lock->l_flags |= LDLM_FL_CBPENDING;
199 do_ast = (!lock->l_readers && !lock->l_writers);
200 unlock_res_and_lock(lock);
203 struct lustre_handle lockh;
206 LDLM_DEBUG(lock, "already unused, calling ldlm_cli_cancel");
207 ldlm_lock2handle(lock, &lockh);
208 rc = ldlm_cli_cancel(&lockh);
210 CERROR("ldlm_cli_cancel: %d\n", rc);
212 LDLM_DEBUG(lock, "Lock still has references, will be "
219 * ->l_glimpse_ast() for DLM extent locks acquired on the server-side. See
220 * comment in filter_intent_policy() on why you may need this.
222 int ldlm_glimpse_ast(struct ldlm_lock *lock, void *reqp)
225 * Returning -ELDLM_NO_LOCK_DATA actually works, but the reason for
226 * that is rather subtle: with OST-side locking, it may so happen that
227 * _all_ extent locks are held by the OST. If client wants to obtain
228 * current file size it calls ll{,u}_glimpse_size(), and (as locks are
229 * on the server), dummy glimpse callback fires and does
230 * nothing. Client still receives correct file size due to the
231 * following fragment in filter_intent_policy():
233 * rc = l->l_glimpse_ast(l, NULL); // this will update the LVB
234 * if (rc != 0 && res->lr_namespace->ns_lvbo &&
235 * res->lr_namespace->ns_lvbo->lvbo_update) {
236 * res->lr_namespace->ns_lvbo->lvbo_update(res, NULL, 0, 1);
239 * that is, after glimpse_ast() fails, filter_lvbo_update() runs, and
240 * returns correct file size to the client.
242 return -ELDLM_NO_LOCK_DATA;
245 int ldlm_cli_enqueue_local(struct ldlm_namespace *ns,
246 const struct ldlm_res_id *res_id,
247 ldlm_type_t type, ldlm_policy_data_t *policy,
248 ldlm_mode_t mode, int *flags,
249 ldlm_blocking_callback blocking,
250 ldlm_completion_callback completion,
251 ldlm_glimpse_callback glimpse,
252 void *data, __u32 lvb_len, void *lvb_swabber,
253 struct lustre_handle *lockh)
255 struct ldlm_lock *lock;
259 LASSERT(!(*flags & LDLM_FL_REPLAY));
260 if (unlikely(ns_is_client(ns))) {
261 CERROR("Trying to enqueue local lock in a shadow namespace\n");
265 lock = ldlm_lock_create(ns, res_id, type, mode, blocking,
266 completion, glimpse, data, lvb_len);
268 GOTO(out_nolock, err = -ENOMEM);
269 LDLM_DEBUG(lock, "client-side local enqueue handler, new lock created");
271 ldlm_lock_addref_internal(lock, mode);
272 ldlm_lock2handle(lock, lockh);
273 lock_res_and_lock(lock);
274 lock->l_flags |= LDLM_FL_LOCAL;
275 if (*flags & LDLM_FL_ATOMIC_CB)
276 lock->l_flags |= LDLM_FL_ATOMIC_CB;
277 lock->l_lvb_swabber = lvb_swabber;
278 unlock_res_and_lock(lock);
280 lock->l_policy_data = *policy;
281 if (type == LDLM_EXTENT)
282 lock->l_req_extent = policy->l_extent;
284 err = ldlm_lock_enqueue(ns, &lock, policy, flags);
285 if (unlikely(err != ELDLM_OK))
289 *policy = lock->l_policy_data;
291 LDLM_DEBUG_NOLOCK("client-side local enqueue handler END (lock %p)",
294 if (lock->l_completion_ast)
295 lock->l_completion_ast(lock, *flags, NULL);
297 LDLM_DEBUG(lock, "client-side local enqueue END");
305 static void failed_lock_cleanup(struct ldlm_namespace *ns,
306 struct ldlm_lock *lock,
307 struct lustre_handle *lockh, int mode)
309 /* Set a flag to prevent us from sending a CANCEL (bug 407) */
310 lock_res_and_lock(lock);
311 lock->l_flags |= LDLM_FL_LOCAL_ONLY;
312 unlock_res_and_lock(lock);
313 LDLM_DEBUG(lock, "setting FL_LOCAL_ONLY");
315 ldlm_lock_decref_and_cancel(lockh, mode);
317 /* XXX - HACK because we shouldn't call ldlm_lock_destroy()
318 * from llite/file.c/ll_file_flock(). */
319 if (lock->l_resource->lr_type == LDLM_FLOCK) {
320 ldlm_lock_destroy(lock);
324 int ldlm_cli_enqueue_fini(struct obd_export *exp, struct ptlrpc_request *req,
325 ldlm_type_t type, __u8 with_policy, ldlm_mode_t mode,
326 int *flags, void *lvb, __u32 lvb_len,
327 void *lvb_swabber, struct lustre_handle *lockh,int rc)
329 struct ldlm_namespace *ns = exp->exp_obd->obd_namespace;
330 int is_replay = *flags & LDLM_FL_REPLAY;
331 struct ldlm_lock *lock;
332 struct ldlm_reply *reply;
333 int cleanup_phase = 1;
336 lock = ldlm_handle2lock(lockh);
337 /* ldlm_cli_enqueue is holding a reference on this lock. */
339 LASSERT(type == LDLM_FLOCK);
343 if (rc != ELDLM_OK) {
345 LDLM_DEBUG(lock, "client-side enqueue END (%s)",
346 rc == ELDLM_LOCK_ABORTED ? "ABORTED" : "FAILED");
347 if (rc == ELDLM_LOCK_ABORTED) {
348 /* Before we return, swab the reply */
349 reply = lustre_swab_repbuf(req, DLM_LOCKREPLY_OFF,
351 lustre_swab_ldlm_reply);
353 CERROR("Can't unpack ldlm_reply\n");
358 tmplvb = lustre_swab_repbuf(req,
363 GOTO(cleanup, rc = -EPROTO);
365 memcpy(lvb, tmplvb, lvb_len);
371 reply = lustre_swab_repbuf(req, DLM_LOCKREPLY_OFF, sizeof(*reply),
372 lustre_swab_ldlm_reply);
374 CERROR("Can't unpack ldlm_reply\n");
375 GOTO(cleanup, rc = -EPROTO);
378 /* lock enqueued on the server */
381 lock_res_and_lock(lock);
382 lock->l_remote_handle = reply->lock_handle;
383 *flags = reply->lock_flags;
384 lock->l_flags |= reply->lock_flags & LDLM_INHERIT_FLAGS;
385 /* move NO_TIMEOUT flag to the lock to force ldlm_lock_match()
386 * to wait with no timeout as well */
387 lock->l_flags |= reply->lock_flags & LDLM_FL_NO_TIMEOUT;
388 unlock_res_and_lock(lock);
390 CDEBUG(D_INFO, "local: %p, remote cookie: "LPX64", flags: 0x%x\n",
391 lock, reply->lock_handle.cookie, *flags);
393 /* If enqueue returned a blocked lock but the completion handler has
394 * already run, then it fixed up the resource and we don't need to do it
396 if ((*flags) & LDLM_FL_LOCK_CHANGED) {
397 int newmode = reply->lock_desc.l_req_mode;
399 if (newmode && newmode != lock->l_req_mode) {
400 LDLM_DEBUG(lock, "server returned different mode %s",
401 ldlm_lockname[newmode]);
402 lock->l_req_mode = newmode;
405 if (memcmp(reply->lock_desc.l_resource.lr_name.name,
406 lock->l_resource->lr_name.name,
407 sizeof(struct ldlm_res_id))) {
408 CDEBUG(D_INFO, "remote intent success, locking "
409 "(%ld,%ld,%ld) instead of "
411 (long)reply->lock_desc.l_resource.lr_name.name[0],
412 (long)reply->lock_desc.l_resource.lr_name.name[1],
413 (long)reply->lock_desc.l_resource.lr_name.name[2],
414 (long)lock->l_resource->lr_name.name[0],
415 (long)lock->l_resource->lr_name.name[1],
416 (long)lock->l_resource->lr_name.name[2]);
418 ldlm_lock_change_resource(ns, lock,
419 &reply->lock_desc.l_resource.lr_name);
420 if (lock->l_resource == NULL) {
422 GOTO(cleanup, rc = -ENOMEM);
424 LDLM_DEBUG(lock, "client-side enqueue, new resource");
427 if (!(type == LDLM_IBITS && !(exp->exp_connect_flags &
429 lock->l_policy_data =
430 reply->lock_desc.l_policy_data;
431 if (type != LDLM_PLAIN)
432 LDLM_DEBUG(lock,"client-side enqueue, new policy data");
435 if ((*flags) & LDLM_FL_AST_SENT ||
436 /* Cancel extent locks as soon as possible on a liblustre client,
437 * because it cannot handle asynchronous ASTs robustly (see
439 (LIBLUSTRE_CLIENT && type == LDLM_EXTENT)) {
440 lock_res_and_lock(lock);
441 lock->l_flags |= LDLM_FL_CBPENDING | LDLM_FL_BL_AST;
442 unlock_res_and_lock(lock);
443 LDLM_DEBUG(lock, "enqueue reply includes blocking AST");
446 /* If the lock has already been granted by a completion AST, don't
447 * clobber the LVB with an older one. */
448 if (lvb_len && (lock->l_req_mode != lock->l_granted_mode)) {
450 tmplvb = lustre_swab_repbuf(req, DLM_REPLY_REC_OFF, lvb_len,
453 GOTO(cleanup, rc = -EPROTO);
454 memcpy(lock->l_lvb_data, tmplvb, lvb_len);
458 rc = ldlm_lock_enqueue(ns, &lock, NULL, flags);
459 if (lock->l_completion_ast != NULL) {
460 int err = lock->l_completion_ast(lock, *flags, NULL);
463 if (rc && type != LDLM_FLOCK) /* bug 9425, bug 10250 */
468 if (lvb_len && lvb != NULL) {
469 /* Copy the LVB here, and not earlier, because the completion
470 * AST (if any) can override what we got in the reply */
471 memcpy(lvb, lock->l_lvb_data, lvb_len);
474 LDLM_DEBUG(lock, "client-side enqueue END");
477 if (cleanup_phase == 1 && rc)
478 failed_lock_cleanup(ns, lock, lockh, mode);
479 /* Put lock 2 times, the second reference is held by ldlm_cli_enqueue */
485 /* PAGE_SIZE-512 is to allow TCP/IP and LNET headers to fit into
486 * a single page on the send/receive side. XXX: 512 should be changed
487 * to more adequate value. */
488 static inline int ldlm_req_handles_avail(struct obd_export *exp,
489 int *size, int bufcount,
492 int avail = min_t(int, LDLM_MAXREQSIZE, PAGE_SIZE - 512);
493 int old_size = size[bufoff];
495 size[bufoff] = sizeof(struct ldlm_request);
496 avail -= lustre_msg_size(class_exp2cliimp(exp)->imp_msg_magic,
498 avail /= sizeof(struct lustre_handle);
499 avail += LDLM_LOCKREQ_HANDLES - off;
500 size[bufoff] = old_size;
505 static inline int ldlm_cancel_handles_avail(struct obd_export *exp)
507 int size[2] = { sizeof(struct ptlrpc_body),
508 sizeof(struct ldlm_request) };
509 return ldlm_req_handles_avail(exp, size, 2, DLM_LOCKREQ_OFF, 0);
512 /* Cancel lru locks and pack them into the enqueue request. Pack there the given
513 * @count locks in @cancels. */
514 struct ptlrpc_request *ldlm_prep_elc_req(struct obd_export *exp, int version,
515 int opc, int bufcount, int *size,
516 int bufoff, int canceloff,
517 struct list_head *cancels, int count)
519 struct ldlm_namespace *ns = exp->exp_obd->obd_namespace;
520 int flags, avail, to_free, pack = 0;
521 struct ldlm_request *dlm = NULL;
522 struct ptlrpc_request *req;
528 if (exp_connect_cancelset(exp)) {
529 /* Estimate the amount of available space in the request. */
530 avail = ldlm_req_handles_avail(exp, size, bufcount,
532 flags = ns_connect_lru_resize(ns) ?
533 LDLM_CANCEL_LRUR : LDLM_CANCEL_AGED;
534 to_free = !ns_connect_lru_resize(ns) &&
535 opc == LDLM_ENQUEUE ? 1 : 0;
537 /* Cancel lru locks here _only_ if the server supports
538 * EARLY_CANCEL. Otherwise we have to send extra CANCEL
539 * rpc, what will make us slower. */
541 count += ldlm_cancel_lru_local(ns, cancels, to_free,
542 avail - count, 0, flags);
547 size[bufoff] = ldlm_request_bufsize(pack, opc);
549 req = ptlrpc_prep_req(class_exp2cliimp(exp), version,
550 opc, bufcount, size, NULL);
551 if (exp_connect_cancelset(exp) && req) {
553 dlm = lustre_msg_buf(req->rq_reqmsg, bufoff,
555 /* Skip first lock handler in ldlm_request_pack(),
556 * this method will incrment @lock_count according
557 * to the lock handle amount actually written to
559 dlm->lock_count = canceloff;
561 /* Pack into the request @pack lock handles. */
562 ldlm_cli_cancel_list(cancels, pack, req, bufoff, 0);
563 /* Prepare and send separate cancel rpc for others. */
564 ldlm_cli_cancel_list(cancels, count - pack, NULL, 0, 0);
566 ldlm_lock_list_put(cancels, l_bl_ast, count);
571 struct ptlrpc_request *ldlm_prep_enqueue_req(struct obd_export *exp,
572 int bufcount, int *size,
573 struct list_head *cancels,
576 return ldlm_prep_elc_req(exp, LUSTRE_DLM_VERSION, LDLM_ENQUEUE,
577 bufcount, size, DLM_LOCKREQ_OFF,
578 LDLM_ENQUEUE_CANCEL_OFF, cancels, count);
581 /* If a request has some specific initialisation it is passed in @reqp,
582 * otherwise it is created in ldlm_cli_enqueue.
584 * Supports sync and async requests, pass @async flag accordingly. If a
585 * request was created in ldlm_cli_enqueue and it is the async request,
586 * pass it to the caller in @reqp. */
587 int ldlm_cli_enqueue(struct obd_export *exp, struct ptlrpc_request **reqp,
588 struct ldlm_enqueue_info *einfo,
589 const struct ldlm_res_id *res_id,
590 ldlm_policy_data_t *policy, int *flags,
591 void *lvb, __u32 lvb_len, void *lvb_swabber,
592 struct lustre_handle *lockh, int async)
594 struct ldlm_namespace *ns = exp->exp_obd->obd_namespace;
595 struct ldlm_lock *lock;
596 struct ldlm_request *body;
597 struct ldlm_reply *reply;
598 int size[3] = { [MSG_PTLRPC_BODY_OFF] = sizeof(struct ptlrpc_body),
599 [DLM_LOCKREQ_OFF] = sizeof(*body),
600 [DLM_REPLY_REC_OFF] = lvb_len };
601 int is_replay = *flags & LDLM_FL_REPLAY;
602 int req_passed_in = 1, rc, err;
603 struct ptlrpc_request *req;
606 LASSERT(exp != NULL);
608 /* If we're replaying this lock, just check some invariants.
609 * If we're creating a new lock, get everything all setup nice. */
611 lock = ldlm_handle2lock(lockh);
612 LASSERT(lock != NULL);
613 LDLM_DEBUG(lock, "client-side enqueue START");
614 LASSERT(exp == lock->l_conn_export);
616 lock = ldlm_lock_create(ns, res_id, einfo->ei_type,
617 einfo->ei_mode, einfo->ei_cb_bl,
618 einfo->ei_cb_cp, einfo->ei_cb_gl,
619 einfo->ei_cbdata, lvb_len);
622 /* for the local lock, add the reference */
623 ldlm_lock_addref_internal(lock, einfo->ei_mode);
624 ldlm_lock2handle(lock, lockh);
625 lock->l_lvb_swabber = lvb_swabber;
626 if (policy != NULL) {
627 /* INODEBITS_INTEROP: If the server does not support
628 * inodebits, we will request a plain lock in the
629 * descriptor (ldlm_lock2desc() below) but use an
630 * inodebits lock internally with both bits set.
632 if (einfo->ei_type == LDLM_IBITS &&
633 !(exp->exp_connect_flags & OBD_CONNECT_IBITS))
634 lock->l_policy_data.l_inodebits.bits =
635 MDS_INODELOCK_LOOKUP |
636 MDS_INODELOCK_UPDATE;
638 lock->l_policy_data = *policy;
641 if (einfo->ei_type == LDLM_EXTENT)
642 lock->l_req_extent = policy->l_extent;
643 LDLM_DEBUG(lock, "client-side enqueue START");
646 /* lock not sent to server yet */
648 if (reqp == NULL || *reqp == NULL) {
649 req = ldlm_prep_enqueue_req(exp, 2, size, NULL, 0);
651 failed_lock_cleanup(ns, lock, lockh, einfo->ei_mode);
660 LASSERTF(lustre_msg_buflen(req->rq_reqmsg, DLM_LOCKREQ_OFF) >=
661 sizeof(*body), "buflen[%d] = %d, not "LPSZ"\n",
663 lustre_msg_buflen(req->rq_reqmsg, DLM_LOCKREQ_OFF),
667 lock->l_conn_export = exp;
668 lock->l_export = NULL;
669 lock->l_blocking_ast = einfo->ei_cb_bl;
671 /* Dump lock data into the request buffer */
672 body = lustre_msg_buf(req->rq_reqmsg, DLM_LOCKREQ_OFF, sizeof(*body));
673 ldlm_lock2desc(lock, &body->lock_desc);
674 body->lock_flags = *flags;
675 body->lock_handle[0] = *lockh;
677 /* Continue as normal. */
678 if (!req_passed_in) {
679 size[DLM_LOCKREPLY_OFF] = sizeof(*reply);
680 ptlrpc_req_set_repsize(req, 2 + (lvb_len > 0), size);
684 * Liblustre client doesn't get extent locks, except for O_APPEND case
685 * where [0, OBD_OBJECT_EOF] lock is taken, or truncate, where
686 * [i_size, OBD_OBJECT_EOF] lock is taken.
688 LASSERT(ergo(LIBLUSTRE_CLIENT, einfo->ei_type != LDLM_EXTENT ||
689 policy->l_extent.end == OBD_OBJECT_EOF));
692 LASSERT(reqp != NULL);
696 LDLM_DEBUG(lock, "sending request");
697 rc = ptlrpc_queue_wait(req);
698 err = ldlm_cli_enqueue_fini(exp, req, einfo->ei_type, policy ? 1 : 0,
699 einfo->ei_mode, flags, lvb, lvb_len,
700 lvb_swabber, lockh, rc);
702 /* If ldlm_cli_enqueue_fini did not find the lock, we need to free
703 * one reference that we took */
709 if (!req_passed_in && req != NULL) {
710 ptlrpc_req_finished(req);
718 static int ldlm_cli_convert_local(struct ldlm_lock *lock, int new_mode,
721 struct ldlm_resource *res;
724 if (ns_is_client(lock->l_resource->lr_namespace)) {
725 CERROR("Trying to cancel local lock\n");
728 LDLM_DEBUG(lock, "client-side local convert");
730 res = ldlm_lock_convert(lock, new_mode, flags);
732 ldlm_reprocess_all(res);
737 LDLM_DEBUG(lock, "client-side local convert handler END");
742 /* FIXME: one of ldlm_cli_convert or the server side should reject attempted
743 * conversion of locks which are on the waiting or converting queue */
744 /* Caller of this code is supposed to take care of lock readers/writers
746 int ldlm_cli_convert(struct lustre_handle *lockh, int new_mode, __u32 *flags)
748 struct ldlm_request *body;
749 struct ldlm_reply *reply;
750 struct ldlm_lock *lock;
751 struct ldlm_resource *res;
752 struct ptlrpc_request *req;
753 int size[2] = { [MSG_PTLRPC_BODY_OFF] = sizeof(struct ptlrpc_body),
754 [DLM_LOCKREQ_OFF] = sizeof(*body) };
758 lock = ldlm_handle2lock(lockh);
765 if (lock->l_conn_export == NULL)
766 RETURN(ldlm_cli_convert_local(lock, new_mode, flags));
768 LDLM_DEBUG(lock, "client-side convert");
770 req = ptlrpc_prep_req(class_exp2cliimp(lock->l_conn_export),
771 LUSTRE_DLM_VERSION, LDLM_CONVERT, 2, size, NULL);
773 GOTO(out, rc = -ENOMEM);
775 body = lustre_msg_buf(req->rq_reqmsg, DLM_LOCKREQ_OFF, sizeof(*body));
776 body->lock_handle[0] = lock->l_remote_handle;
778 body->lock_desc.l_req_mode = new_mode;
779 body->lock_flags = *flags;
781 size[DLM_LOCKREPLY_OFF] = sizeof(*reply);
782 ptlrpc_req_set_repsize(req, 2, size);
784 rc = ptlrpc_queue_wait(req);
788 reply = lustre_swab_repbuf(req, DLM_LOCKREPLY_OFF, sizeof(*reply),
789 lustre_swab_ldlm_reply);
791 CERROR ("Can't unpack ldlm_reply\n");
792 GOTO (out, rc = -EPROTO);
796 GOTO(out, rc = req->rq_status);
798 res = ldlm_lock_convert(lock, new_mode, &reply->lock_flags);
800 ldlm_reprocess_all(res);
801 /* Go to sleep until the lock is granted. */
802 /* FIXME: or cancelled. */
803 if (lock->l_completion_ast) {
804 rc = lock->l_completion_ast(lock, LDLM_FL_WAIT_NOREPROC,
815 ptlrpc_req_finished(req);
819 /* Cancel locks locally.
821 * LDLM_FL_LOCAL_ONLY if tere is no need in a CANCEL rpc to the server;
822 * LDLM_FL_CANCELING otherwise;
823 * LDLM_FL_BL_AST if there is a need in a separate CANCEL rpc. */
824 static int ldlm_cli_cancel_local(struct ldlm_lock *lock)
826 int rc = LDLM_FL_LOCAL_ONLY;
829 if (lock->l_conn_export) {
832 LDLM_DEBUG(lock, "client-side cancel");
833 /* Set this flag to prevent others from getting new references*/
834 lock_res_and_lock(lock);
835 lock->l_flags |= LDLM_FL_CBPENDING;
836 local_only = (lock->l_flags &
837 (LDLM_FL_LOCAL_ONLY|LDLM_FL_CANCEL_ON_BLOCK));
838 ldlm_cancel_callback(lock);
839 rc = (lock->l_flags & LDLM_FL_BL_AST) ?
840 LDLM_FL_BL_AST : LDLM_FL_CANCELING;
841 unlock_res_and_lock(lock);
844 CDEBUG(D_DLMTRACE, "not sending request (at caller's "
846 rc = LDLM_FL_LOCAL_ONLY;
848 ldlm_lock_cancel(lock);
850 if (ns_is_client(lock->l_resource->lr_namespace)) {
851 LDLM_ERROR(lock, "Trying to cancel local lock");
854 LDLM_DEBUG(lock, "server-side local cancel");
855 ldlm_lock_cancel(lock);
856 ldlm_reprocess_all(lock->l_resource);
857 LDLM_DEBUG(lock, "server-side local cancel handler END");
863 /* Pack @count locks in @head into ldlm_request buffer at the offset @off,
864 of the request @req. */
865 static void ldlm_cancel_pack(struct ptlrpc_request *req, int off,
866 struct list_head *head, int count)
868 struct ldlm_request *dlm;
869 struct ldlm_lock *lock;
873 dlm = lustre_msg_buf(req->rq_reqmsg, off, sizeof(*dlm));
874 LASSERT(dlm != NULL);
876 /* Check the room in the request buffer. */
877 max = lustre_msg_buflen(req->rq_reqmsg, off) -
878 sizeof(struct ldlm_request);
879 max /= sizeof(struct lustre_handle);
880 max += LDLM_LOCKREQ_HANDLES;
881 LASSERT(max >= dlm->lock_count + count);
883 /* XXX: it would be better to pack lock handles grouped by resource.
884 * so that the server cancel would call filter_lvbo_update() less
886 list_for_each_entry(lock, head, l_bl_ast) {
889 LASSERT(lock->l_conn_export);
890 /* Pack the lock handle to the given request buffer. */
891 LDLM_DEBUG(lock, "packing");
892 dlm->lock_handle[dlm->lock_count++] = lock->l_remote_handle;
895 CDEBUG(D_DLMTRACE, "%d locks packed\n", packed);
899 /* Prepare and send a batched cancel rpc, it will include count lock handles
900 * of locks given in @head. */
901 int ldlm_cli_cancel_req(struct obd_export *exp, struct list_head *cancels,
902 int count, int flags)
904 struct ptlrpc_request *req = NULL;
905 struct ldlm_request *body;
906 int size[2] = { [MSG_PTLRPC_BODY_OFF] = sizeof(struct ptlrpc_body),
907 [DLM_LOCKREQ_OFF] = sizeof(*body) };
908 struct obd_import *imp;
913 LASSERT(exp != NULL);
916 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_CANCEL_RACE))
919 free = ldlm_req_handles_avail(exp, size, 2, DLM_LOCKREQ_OFF, 0);
923 size[DLM_LOCKREQ_OFF] = ldlm_request_bufsize(count, LDLM_CANCEL);
925 imp = class_exp2cliimp(exp);
926 if (imp == NULL || imp->imp_invalid) {
928 "skipping cancel on invalid import %p\n", imp);
932 req = ptlrpc_prep_req(imp, LUSTRE_DLM_VERSION, LDLM_CANCEL, 2,
935 GOTO(out, rc = -ENOMEM);
937 req->rq_no_resend = 1;
938 req->rq_no_delay = 1;
940 /* XXX FIXME bug 249 */
941 req->rq_request_portal = LDLM_CANCEL_REQUEST_PORTAL;
942 req->rq_reply_portal = LDLM_CANCEL_REPLY_PORTAL;
944 body = lustre_msg_buf(req->rq_reqmsg, DLM_LOCKREQ_OFF,
946 ldlm_cancel_pack(req, DLM_LOCKREQ_OFF, cancels, count);
948 ptlrpc_req_set_repsize(req, 1, NULL);
949 if (flags & LDLM_FL_ASYNC) {
950 ptlrpcd_add_req(req);
954 rc = ptlrpc_queue_wait(req);
957 CDEBUG(D_DLMTRACE, "client/server (nid %s) "
958 "out of sync -- not fatal\n",
959 libcfs_nid2str(req->rq_import->
960 imp_connection->c_peer.nid));
962 } else if (rc == -ETIMEDOUT && /* check there was no reconnect*/
963 req->rq_import_generation == imp->imp_generation) {
964 ptlrpc_req_finished(req);
966 } else if (rc != ELDLM_OK) {
967 CERROR("Got rc %d from cancel RPC: canceling "
975 ptlrpc_req_finished(req);
978 return sent ? sent : rc;
981 static inline struct ldlm_pool *ldlm_imp2pl(struct obd_import *imp)
983 LASSERT(imp != NULL);
984 return &imp->imp_obd->obd_namespace->ns_pool;
987 int ldlm_cli_update_pool(struct ptlrpc_request *req)
989 struct ldlm_pool *pl;
992 if (!imp_connect_lru_resize(req->rq_import))
995 if (lustre_msg_get_slv(req->rq_repmsg) == 0 ||
996 lustre_msg_get_limit(req->rq_repmsg) == 0)
999 pl = ldlm_imp2pl(req->rq_import);
1001 spin_lock(&pl->pl_lock);
1003 /* Check if we need to wakeup pools thread for fast SLV change.
1004 * This is only done when threads period is noticably long like
1006 #if defined(__KERNEL__) && (LDLM_POOLS_THREAD_PERIOD >= 10)
1008 __u64 old_slv, new_slv, fast_change;
1010 old_slv = ldlm_pool_get_slv(pl);
1011 new_slv = lustre_msg_get_slv(req->rq_repmsg);
1012 fast_change = old_slv * LDLM_POOLS_FAST_SLV_CHANGE;
1013 do_div(fast_change, 100);
1015 /* Wake up pools thread only if SLV has changed more than
1016 * 50% since last update. In this case we want to react asap.
1017 * Otherwise it is no sense to wake up pools as they are
1018 * re-calculated every LDLM_POOLS_THREAD_PERIOD anyways. */
1019 if (old_slv > new_slv && old_slv - new_slv > fast_change)
1020 ldlm_pools_wakeup();
1023 /* In some cases RPC may contain slv and limit zeroed out. This is
1024 * the case when server does not support lru resize feature. This is
1025 * also possible in some recovery cases when server side reqs have no
1026 * ref to obd export and thus access to server side namespace is no
1028 if (lustre_msg_get_slv(req->rq_repmsg) != 0 &&
1029 lustre_msg_get_limit(req->rq_repmsg) != 0) {
1030 ldlm_pool_set_slv(pl, lustre_msg_get_slv(req->rq_repmsg));
1031 ldlm_pool_set_limit(pl, lustre_msg_get_limit(req->rq_repmsg));
1033 DEBUG_REQ(D_HA, req, "zero SLV or Limit found "
1034 "(SLV: "LPU64", Limit: %u)",
1035 lustre_msg_get_slv(req->rq_repmsg),
1036 lustre_msg_get_limit(req->rq_repmsg));
1038 spin_unlock(&pl->pl_lock);
1042 EXPORT_SYMBOL(ldlm_cli_update_pool);
1044 int ldlm_cli_cancel(struct lustre_handle *lockh)
1046 int avail, flags, count = 1, rc = 0;
1047 struct ldlm_namespace *ns;
1048 struct ldlm_lock *lock;
1049 CFS_LIST_HEAD(cancels);
1052 /* concurrent cancels on the same handle can happen */
1053 lock = __ldlm_handle2lock(lockh, LDLM_FL_CANCELING);
1055 LDLM_DEBUG_NOLOCK("lock is already being destroyed\n");
1059 rc = ldlm_cli_cancel_local(lock);
1060 if (rc < 0 || rc == LDLM_FL_LOCAL_ONLY) {
1061 LDLM_LOCK_PUT(lock);
1062 RETURN(rc < 0 ? rc : 0);
1064 /* Even if the lock is marked as LDLM_FL_BL_AST, this is a LDLM_CANCEL
1065 * rpc which goes to canceld portal, so we can cancel other lru locks
1066 * here and send them all as one LDLM_CANCEL rpc. */
1067 LASSERT(list_empty(&lock->l_bl_ast));
1068 list_add(&lock->l_bl_ast, &cancels);
1069 if (exp_connect_cancelset(lock->l_conn_export)) {
1070 avail = ldlm_cancel_handles_avail(lock->l_conn_export);
1073 ns = lock->l_resource->lr_namespace;
1074 flags = ns_connect_lru_resize(ns) ?
1075 LDLM_CANCEL_LRUR : LDLM_CANCEL_AGED;
1076 count += ldlm_cancel_lru_local(ns, &cancels, 0, avail - 1,
1077 LDLM_FL_BL_AST, flags);
1079 ldlm_cli_cancel_list(&cancels, count, NULL, 0, 0);
1083 /* XXX until we will have compound requests and can cut cancels from generic rpc
1084 * we need send cancels with LDLM_FL_BL_AST flag as separate rpc */
1085 static int ldlm_cancel_list(struct list_head *cancels, int count, int flags)
1087 CFS_LIST_HEAD(head);
1088 struct ldlm_lock *lock, *next;
1089 int left = 0, bl_ast = 0, rc;
1092 list_for_each_entry_safe(lock, next, cancels, l_bl_ast) {
1096 if (flags & LDLM_FL_LOCAL_ONLY) {
1097 rc = LDLM_FL_LOCAL_ONLY;
1098 ldlm_lock_cancel(lock);
1100 rc = ldlm_cli_cancel_local(lock);
1102 if (!(flags & LDLM_FL_BL_AST) && (rc == LDLM_FL_BL_AST)) {
1103 LDLM_DEBUG(lock, "Cancel lock separately");
1104 list_del_init(&lock->l_bl_ast);
1105 list_add(&lock->l_bl_ast, &head);
1109 if (rc == LDLM_FL_LOCAL_ONLY) {
1110 /* CANCEL RPC should not be sent to server. */
1111 list_del_init(&lock->l_bl_ast);
1112 LDLM_LOCK_PUT(lock);
1119 ldlm_cli_cancel_list(&head, bl_ast, NULL, 0, 0);
1125 /* Return 1 if @lock should be canceled according to shrinker policy.
1126 * Return zero otherwise. */
1127 static int ldlm_cancel_shrink_policy(struct ldlm_namespace *ns,
1128 struct ldlm_lock *lock,
1129 int unused, int added,
1135 if (lock->l_resource->lr_type == LDLM_EXTENT) {
1136 struct ldlm_extent *l_extent;
1138 /* For all extent locks cost is 1 + number of pages in
1140 l_extent = &lock->l_policy_data.l_extent;
1141 page_nr = (l_extent->end - l_extent->start);
1142 do_div(page_nr, CFS_PAGE_SIZE);
1145 /* XXX: In fact this is evil hack, we can't access inode
1146 * here. For doing it right we need somehow to have number
1147 * of covered by lock. This should be fixed later when 10718
1149 if (lock->l_ast_data != NULL) {
1150 struct inode *inode = lock->l_ast_data;
1151 if (page_nr > inode->i_mapping->nrpages)
1152 page_nr = inode->i_mapping->nrpages;
1155 lock_cost = 1 + page_nr;
1157 /* For all locks which are not extent ones cost is 1 */
1161 /* Keep all expensive locks in lru for the memory pressure time
1162 * cancel policy. They anyways may be canceled by lru resize
1163 * pplicy if they have not small enough CLV. */
1164 return (lock_cost <= ns->ns_shrink_thumb);
1167 /* Return 1 if @lock should be canceled according to lru resize policy.
1168 * Return zero otherwise. */
1169 static int ldlm_cancel_lrur_policy(struct ldlm_namespace *ns,
1170 struct ldlm_lock *lock,
1171 int unused, int added,
1174 cfs_time_t cur = cfs_time_current();
1175 struct ldlm_pool *pl = &ns->ns_pool;
1179 spin_lock(&pl->pl_lock);
1180 slv = ldlm_pool_get_slv(pl);
1181 lvf = atomic_read(&pl->pl_lock_volume_factor);
1182 spin_unlock(&pl->pl_lock);
1184 la = cfs_duration_sec(cfs_time_sub(cur,
1185 lock->l_last_used));
1187 /* Stop when slv is not yet come from server or
1188 * lv is smaller than it is. */
1189 lv = lvf * la * unused;
1190 return (slv > 1 && lv >= slv);
1193 /* Return 1 if @lock should be canceled according to passed policy.
1194 * Return zero otherwise. */
1195 static int ldlm_cancel_passed_policy(struct ldlm_namespace *ns,
1196 struct ldlm_lock *lock,
1197 int unused, int added,
1200 /* Do nothing here, we allow canceling all locks which
1201 * are passed here from upper layer logic. So that locks
1202 * number to be canceled will be limited by @count and
1203 * @max in ldlm_cancel_lru_local(). */
1207 /* Return 1 if @lock should be canceled according to aged policy.
1208 * Return zero otherwise. */
1209 static int ldlm_cancel_aged_policy(struct ldlm_namespace *ns,
1210 struct ldlm_lock *lock,
1211 int unused, int added,
1214 /* Cancel old locks if reached asked limit. */
1215 return !((added >= asked) &&
1216 cfs_time_before_64(cfs_time_current(),
1217 cfs_time_add(lock->l_last_used,
1221 typedef int (*ldlm_cancel_lru_policy_t)(struct ldlm_namespace *,
1222 struct ldlm_lock *, int,
1225 static ldlm_cancel_lru_policy_t
1226 ldlm_cancel_lru_policy(struct ldlm_namespace *ns, int flags)
1228 if (ns_connect_lru_resize(ns)) {
1229 if (flags & LDLM_CANCEL_SHRINK)
1230 return ldlm_cancel_shrink_policy;
1231 else if (flags & LDLM_CANCEL_LRUR)
1232 return ldlm_cancel_lrur_policy;
1233 else if (flags & LDLM_CANCEL_PASSED)
1234 return ldlm_cancel_passed_policy;
1236 if (flags & LDLM_CANCEL_AGED)
1237 return ldlm_cancel_aged_policy;
1242 /* - Free space in lru for @count new locks,
1243 * redundant unused locks are canceled locally;
1244 * - also cancel locally unused aged locks;
1245 * - do not cancel more than @max locks;
1246 * - GET the found locks and add them into the @cancels list.
1248 * A client lock can be added to the l_bl_ast list only when it is
1249 * marked LDLM_FL_CANCELING. Otherwise, somebody is already doing CANCEL.
1250 * There are the following use cases: ldlm_cancel_resource_local(),
1251 * ldlm_cancel_lru_local() and ldlm_cli_cancel(), which check&set this
1252 * flag properly. As any attempt to cancel a lock rely on this flag,
1253 * l_bl_ast list is accessed later without any special locking.
1255 * Calling policies for enabled lru resize:
1256 * ----------------------------------------
1257 * flags & LDLM_CANCEL_LRUR - use lru resize policy (SLV from server) to
1258 * cancel not more than @count locks;
1260 * flags & LDLM_CANCEL_PASSED - cancel @count number of old locks (located at
1261 * the beginning of lru list);
1263 * flags & LDLM_CANCEL_SHRINK - cancel not more than @count locks according to
1264 * memory pressre policy function.
1266 int ldlm_cancel_lru_local(struct ldlm_namespace *ns, struct list_head *cancels,
1267 int count, int max, int cancel_flags, int flags)
1269 ldlm_cancel_lru_policy_t cancel_lru_policy_func;
1270 int added = 0, unused, cancel;
1271 struct ldlm_lock *lock, *next;
1274 spin_lock(&ns->ns_unused_lock);
1275 unused = ns->ns_nr_unused;
1277 if (!ns_connect_lru_resize(ns))
1278 count += unused - ns->ns_max_unused;
1280 cancel_lru_policy_func = ldlm_cancel_lru_policy(ns, flags);
1282 list_for_each_entry_safe(lock, next, &ns->ns_unused_list, l_lru) {
1283 /* Make sure that we skip locks being already in cancel. */
1284 if ((lock->l_flags & LDLM_FL_CANCELING) ||
1285 (lock->l_flags & LDLM_FL_BL_AST))
1288 /* For any flags, stop scanning if @max or passed @count is
1290 if ((max && added >= max) || (count && added >= count))
1293 /* Pass the lock through the policy filter and see if it
1294 * should stay in lru. */
1295 if (cancel_lru_policy_func != NULL) {
1296 cancel = cancel_lru_policy_func(ns, lock, unused,
1299 /* Take next lock for shrink policy, we need to check
1300 * whole list. Stop scanning for other policies. */
1301 if ((flags & LDLM_CANCEL_SHRINK) && !cancel)
1307 if (cancels != NULL) {
1308 LDLM_LOCK_GET(lock); /* dropped by bl thread */
1309 spin_unlock(&ns->ns_unused_lock);
1311 lock_res_and_lock(lock);
1312 /* Check flags again under the lock. */
1313 if ((lock->l_flags & LDLM_FL_CANCELING) ||
1314 (lock->l_flags & LDLM_FL_BL_AST) ||
1315 (ldlm_lock_remove_from_lru(lock) == 0)) {
1316 /* other thread is removing lock from lru or
1317 * somebody is already doing CANCEL or
1318 * there is a blocking request which will send
1319 * cancel by itseft. */
1320 unlock_res_and_lock(lock);
1321 LDLM_LOCK_PUT(lock);
1322 spin_lock(&ns->ns_unused_lock);
1325 LASSERT(!lock->l_readers && !lock->l_writers);
1327 /* If we have chosen to cancel this lock voluntarily, we
1328 * better send cancel notification to server, so that it
1329 * frees appropriate state. This might lead to a race
1330 * where while we are doing cancel here, server is also
1331 * silently cancelling this lock. */
1332 lock->l_flags &= ~LDLM_FL_CANCEL_ON_BLOCK;
1334 /* Setting the CBPENDING flag is a little misleading,
1335 * but prevents an important race; namely, once
1336 * CBPENDING is set, the lock can accumulate no more
1337 * readers/writers. Since readers and writers are
1338 * already zero here, ldlm_lock_decref() won't see
1339 * this flag and call l_blocking_ast */
1340 lock->l_flags |= LDLM_FL_CBPENDING | LDLM_FL_CANCELING;
1342 /* We can't re-add to l_lru as it confuses the
1343 * refcounting in ldlm_lock_remove_from_lru() if an AST
1344 * arrives after we drop ns_lock below. We use l_bl_ast
1345 * and can't use l_pending_chain as it is used both on
1346 * server and client nevertheless bug 5666 says it is
1347 * used only on server */
1348 LASSERT(list_empty(&lock->l_bl_ast));
1349 list_add(&lock->l_bl_ast, cancels);
1350 unlock_res_and_lock(lock);
1351 spin_lock(&ns->ns_unused_lock);
1356 spin_unlock(&ns->ns_unused_lock);
1358 if (cancels == NULL)
1361 RETURN(ldlm_cancel_list(cancels, added, cancel_flags));
1364 /* when called with LDLM_ASYNC the blocking callback will be handled
1365 * in a thread and this function will return after the thread has been
1366 * asked to call the callback. when called with LDLM_SYNC the blocking
1367 * callback will be performed in this function. */
1368 int ldlm_cancel_lru(struct ldlm_namespace *ns, int nr, ldlm_sync_t sync,
1371 CFS_LIST_HEAD(cancels);
1376 sync = LDLM_SYNC; /* force to be sync in user space */
1378 count = ldlm_cancel_lru_local(ns, &cancels, nr, 0, 0, flags);
1379 if (sync == LDLM_ASYNC) {
1380 rc = ldlm_bl_to_thread_list(ns, NULL, &cancels, count);
1385 /* If an error occured in ASYNC mode, or
1386 * this is SYNC mode, cancel the list. */
1387 ldlm_cli_cancel_list(&cancels, count, NULL, 0, 0);
1391 /* Find and cancel locally unused locks found on resource, matched to the
1392 * given policy, mode. GET the found locks and add them into the @cancels
1394 int ldlm_cancel_resource_local(struct ldlm_resource *res,
1395 struct list_head *cancels,
1396 ldlm_policy_data_t *policy,
1397 ldlm_mode_t mode, int lock_flags,
1398 int cancel_flags, void *opaque)
1400 struct ldlm_lock *lock;
1405 list_for_each_entry(lock, &res->lr_granted, l_res_link) {
1406 if (opaque != NULL && lock->l_ast_data != opaque) {
1407 LDLM_ERROR(lock, "data %p doesn't match opaque %p",
1408 lock->l_ast_data, opaque);
1413 if (lock->l_readers || lock->l_writers) {
1414 if (cancel_flags & LDLM_FL_WARN) {
1415 LDLM_ERROR(lock, "lock in use");
1421 /* If somebody is already doing CANCEL, or blocking ast came,
1422 * skip this lock. */
1423 if (lock->l_flags & LDLM_FL_BL_AST ||
1424 lock->l_flags & LDLM_FL_CANCELING)
1427 if (lockmode_compat(lock->l_granted_mode, mode))
1430 /* If policy is given and this is IBITS lock, add to list only
1431 * those locks that match by policy. */
1432 if (policy && (lock->l_resource->lr_type == LDLM_IBITS) &&
1433 !(lock->l_policy_data.l_inodebits.bits &
1434 policy->l_inodebits.bits))
1437 /* See CBPENDING comment in ldlm_cancel_lru */
1438 lock->l_flags |= LDLM_FL_CBPENDING | LDLM_FL_CANCELING |
1441 LASSERT(list_empty(&lock->l_bl_ast));
1442 list_add(&lock->l_bl_ast, cancels);
1443 LDLM_LOCK_GET(lock);
1448 RETURN(ldlm_cancel_list(cancels, count, cancel_flags));
1451 /* If @req is NULL, send CANCEL request to server with handles of locks
1452 * in the @cancels. If EARLY_CANCEL is not supported, send CANCEL requests
1453 * separately per lock.
1454 * If @req is not NULL, put handles of locks in @cancels into the request
1455 * buffer at the offset @off.
1456 * Destroy @cancels at the end. */
1457 int ldlm_cli_cancel_list(struct list_head *cancels, int count,
1458 struct ptlrpc_request *req, int off, int flags)
1460 struct ldlm_lock *lock;
1464 if (list_empty(cancels) || count == 0)
1467 /* XXX: requests (both batched and not) could be sent in parallel.
1468 * Usually it is enough to have just 1 RPC, but it is possible that
1469 * there are to many locks to be cancelled in LRU or on a resource.
1470 * It would also speed up the case when the server does not support
1473 LASSERT(!list_empty(cancels));
1474 lock = list_entry(cancels->next, struct ldlm_lock, l_bl_ast);
1475 LASSERT(lock->l_conn_export);
1477 if (exp_connect_cancelset(lock->l_conn_export)) {
1480 ldlm_cancel_pack(req, off, cancels, count);
1482 res = ldlm_cli_cancel_req(lock->l_conn_export,
1486 res = ldlm_cli_cancel_req(lock->l_conn_export,
1491 CERROR("ldlm_cli_cancel_list: %d\n", res);
1496 ldlm_lock_list_put(cancels, l_bl_ast, res);
1498 LASSERT(count == 0);
1502 int ldlm_cli_cancel_unused_resource(struct ldlm_namespace *ns,
1503 const struct ldlm_res_id *res_id,
1504 ldlm_policy_data_t *policy,
1505 ldlm_mode_t mode, int flags, void *opaque)
1507 struct ldlm_resource *res;
1508 CFS_LIST_HEAD(cancels);
1513 res = ldlm_resource_get(ns, NULL, res_id, 0, 0);
1515 /* This is not a problem. */
1516 CDEBUG(D_INFO, "No resource "LPU64"\n", res_id->name[0]);
1520 count = ldlm_cancel_resource_local(res, &cancels, policy, mode,
1522 rc = ldlm_cli_cancel_list(&cancels, count, NULL, 0, flags);
1524 CERROR("ldlm_cli_cancel_unused_resource: %d\n", rc);
1526 ldlm_resource_putref(res);
1530 static inline int have_no_nsresource(struct ldlm_namespace *ns)
1532 int no_resource = 0;
1534 spin_lock(&ns->ns_hash_lock);
1535 if (ns->ns_resources == 0)
1537 spin_unlock(&ns->ns_hash_lock);
1539 RETURN(no_resource);
1542 /* Cancel all locks on a namespace (or a specific resource, if given)
1543 * that have 0 readers/writers.
1545 * If flags & LDLM_FL_LOCAL_ONLY, throw the locks away without trying
1546 * to notify the server. */
1547 int ldlm_cli_cancel_unused(struct ldlm_namespace *ns,
1548 const struct ldlm_res_id *res_id,
1549 int flags, void *opaque)
1558 RETURN(ldlm_cli_cancel_unused_resource(ns, res_id, NULL,
1562 spin_lock(&ns->ns_hash_lock);
1563 for (i = 0; i < RES_HASH_SIZE; i++) {
1564 struct list_head *tmp;
1565 tmp = ns->ns_hash[i].next;
1566 while (tmp != &(ns->ns_hash[i])) {
1567 struct ldlm_resource *res;
1570 res = list_entry(tmp, struct ldlm_resource, lr_hash);
1571 ldlm_resource_getref(res);
1572 spin_unlock(&ns->ns_hash_lock);
1574 rc = ldlm_cli_cancel_unused_resource(ns, &res->lr_name,
1579 CERROR("ldlm_cli_cancel_unused ("LPU64"): %d\n",
1580 res->lr_name.name[0], rc);
1582 spin_lock(&ns->ns_hash_lock);
1584 ldlm_resource_putref_locked(res);
1587 spin_unlock(&ns->ns_hash_lock);
1592 /* join/split resource locks to/from lru list */
1593 int ldlm_cli_join_lru(struct ldlm_namespace *ns,
1594 const struct ldlm_res_id *res_id, int join)
1596 struct ldlm_resource *res;
1597 struct ldlm_lock *lock, *n;
1601 LASSERT(ns_is_client(ns));
1603 res = ldlm_resource_get(ns, NULL, res_id, LDLM_EXTENT, 0);
1606 LASSERT(res->lr_type == LDLM_EXTENT);
1612 list_for_each_entry_safe (lock, n, &res->lr_granted, l_res_link) {
1613 if (list_empty(&lock->l_lru) &&
1614 !lock->l_readers && !lock->l_writers &&
1615 !(lock->l_flags & LDLM_FL_LOCAL) &&
1616 !(lock->l_flags & LDLM_FL_CBPENDING)) {
1617 ldlm_lock_add_to_lru(lock);
1618 lock->l_flags &= ~LDLM_FL_NO_LRU;
1619 LDLM_DEBUG(lock, "join lock to lru");
1625 spin_lock(&ns->ns_unused_lock);
1626 list_for_each_entry_safe (lock, n, &ns->ns_unused_list, l_lru) {
1627 if (lock->l_resource == res) {
1628 ldlm_lock_remove_from_lru_nolock(lock);
1629 lock->l_flags |= LDLM_FL_NO_LRU;
1630 LDLM_DEBUG(lock, "split lock from lru");
1634 spin_unlock(&ns->ns_unused_lock);
1637 ldlm_resource_putref(res);
1641 /* Lock iterators. */
1643 int ldlm_resource_foreach(struct ldlm_resource *res, ldlm_iterator_t iter,
1646 struct list_head *tmp, *next;
1647 struct ldlm_lock *lock;
1648 int rc = LDLM_ITER_CONTINUE;
1653 RETURN(LDLM_ITER_CONTINUE);
1656 list_for_each_safe(tmp, next, &res->lr_granted) {
1657 lock = list_entry(tmp, struct ldlm_lock, l_res_link);
1659 if (iter(lock, closure) == LDLM_ITER_STOP)
1660 GOTO(out, rc = LDLM_ITER_STOP);
1663 list_for_each_safe(tmp, next, &res->lr_converting) {
1664 lock = list_entry(tmp, struct ldlm_lock, l_res_link);
1666 if (iter(lock, closure) == LDLM_ITER_STOP)
1667 GOTO(out, rc = LDLM_ITER_STOP);
1670 list_for_each_safe(tmp, next, &res->lr_waiting) {
1671 lock = list_entry(tmp, struct ldlm_lock, l_res_link);
1673 if (iter(lock, closure) == LDLM_ITER_STOP)
1674 GOTO(out, rc = LDLM_ITER_STOP);
1681 struct iter_helper_data {
1682 ldlm_iterator_t iter;
1686 static int ldlm_iter_helper(struct ldlm_lock *lock, void *closure)
1688 struct iter_helper_data *helper = closure;
1689 return helper->iter(lock, helper->closure);
1692 static int ldlm_res_iter_helper(struct ldlm_resource *res, void *closure)
1694 return ldlm_resource_foreach(res, ldlm_iter_helper, closure);
1697 int ldlm_namespace_foreach(struct ldlm_namespace *ns, ldlm_iterator_t iter,
1700 struct iter_helper_data helper = { iter: iter, closure: closure };
1701 return ldlm_namespace_foreach_res(ns, ldlm_res_iter_helper, &helper);
1704 int ldlm_namespace_foreach_res(struct ldlm_namespace *ns,
1705 ldlm_res_iterator_t iter, void *closure)
1707 int i, rc = LDLM_ITER_CONTINUE;
1708 struct ldlm_resource *res;
1709 struct list_head *tmp;
1712 spin_lock(&ns->ns_hash_lock);
1713 for (i = 0; i < RES_HASH_SIZE; i++) {
1714 tmp = ns->ns_hash[i].next;
1715 while (tmp != &(ns->ns_hash[i])) {
1716 res = list_entry(tmp, struct ldlm_resource, lr_hash);
1717 ldlm_resource_getref(res);
1718 spin_unlock(&ns->ns_hash_lock);
1720 rc = iter(res, closure);
1722 spin_lock(&ns->ns_hash_lock);
1724 ldlm_resource_putref_locked(res);
1725 if (rc == LDLM_ITER_STOP)
1730 spin_unlock(&ns->ns_hash_lock);
1734 /* non-blocking function to manipulate a lock whose cb_data is being put away.*/
1735 void ldlm_resource_iterate(struct ldlm_namespace *ns,
1736 const struct ldlm_res_id *res_id,
1737 ldlm_iterator_t iter, void *data)
1739 struct ldlm_resource *res;
1743 CERROR("must pass in namespace\n");
1747 res = ldlm_resource_get(ns, NULL, res_id, 0, 0);
1753 ldlm_resource_foreach(res, iter, data);
1754 ldlm_resource_putref(res);
1760 static int ldlm_chain_lock_for_replay(struct ldlm_lock *lock, void *closure)
1762 struct list_head *list = closure;
1764 /* we use l_pending_chain here, because it's unused on clients. */
1765 LASSERTF(list_empty(&lock->l_pending_chain),"lock %p next %p prev %p\n",
1766 lock, &lock->l_pending_chain.next,&lock->l_pending_chain.prev);
1767 /* bug 9573: don't replay locks left after eviction */
1768 if (!(lock->l_flags & LDLM_FL_FAILED))
1769 list_add(&lock->l_pending_chain, list);
1770 return LDLM_ITER_CONTINUE;
1773 static int replay_lock_interpret(struct ptlrpc_request *req,
1774 struct ldlm_async_args *aa, int rc)
1776 struct ldlm_lock *lock;
1777 struct ldlm_reply *reply;
1780 atomic_dec(&req->rq_import->imp_replay_inflight);
1785 reply = lustre_swab_repbuf(req, DLM_LOCKREPLY_OFF, sizeof(*reply),
1786 lustre_swab_ldlm_reply);
1787 if (reply == NULL) {
1788 CERROR("Can't unpack ldlm_reply\n");
1789 GOTO (out, rc = -EPROTO);
1792 lock = ldlm_handle2lock(&aa->lock_handle);
1794 CERROR("received replay ack for unknown local cookie "LPX64
1795 " remote cookie "LPX64 " from server %s id %s\n",
1796 aa->lock_handle.cookie, reply->lock_handle.cookie,
1797 req->rq_export->exp_client_uuid.uuid,
1798 libcfs_id2str(req->rq_peer));
1799 GOTO(out, rc = -ESTALE);
1802 lock->l_remote_handle = reply->lock_handle;
1803 LDLM_DEBUG(lock, "replayed lock:");
1804 ptlrpc_import_recovery_state_machine(req->rq_import);
1805 LDLM_LOCK_PUT(lock);
1808 ptlrpc_connect_import(req->rq_import, NULL);
1814 static int replay_one_lock(struct obd_import *imp, struct ldlm_lock *lock)
1816 struct ptlrpc_request *req;
1817 struct ldlm_request *body;
1818 struct ldlm_reply *reply;
1819 struct ldlm_async_args *aa;
1821 int size[3] = { sizeof(struct ptlrpc_body) };
1826 /* Bug 11974: Do not replay a lock which is actively being canceled */
1827 if (lock->l_flags & LDLM_FL_CANCELING) {
1828 LDLM_DEBUG(lock, "Not replaying canceled lock:");
1832 /* If this is reply-less callback lock, we cannot replay it, since
1833 * server might have long dropped it, but notification of that event was
1834 * lost by network. (and server granted conflicting lock already) */
1835 if (lock->l_flags & LDLM_FL_CANCEL_ON_BLOCK) {
1836 LDLM_DEBUG(lock, "Not replaying reply-less lock:");
1837 ldlm_lock_cancel(lock);
1841 * If granted mode matches the requested mode, this lock is granted.
1843 * If they differ, but we have a granted mode, then we were granted
1844 * one mode and now want another: ergo, converting.
1846 * If we haven't been granted anything and are on a resource list,
1847 * then we're blocked/waiting.
1849 * If we haven't been granted anything and we're NOT on a resource list,
1850 * then we haven't got a reply yet and don't have a known disposition.
1851 * This happens whenever a lock enqueue is the request that triggers
1854 if (lock->l_granted_mode == lock->l_req_mode)
1855 flags = LDLM_FL_REPLAY | LDLM_FL_BLOCK_GRANTED;
1856 else if (lock->l_granted_mode)
1857 flags = LDLM_FL_REPLAY | LDLM_FL_BLOCK_CONV;
1858 else if (!list_empty(&lock->l_res_link))
1859 flags = LDLM_FL_REPLAY | LDLM_FL_BLOCK_WAIT;
1861 flags = LDLM_FL_REPLAY;
1863 size[DLM_LOCKREQ_OFF] = sizeof(*body);
1864 req = ptlrpc_prep_req(imp, LUSTRE_DLM_VERSION, LDLM_ENQUEUE, 2, size,
1869 /* We're part of recovery, so don't wait for it. */
1870 req->rq_send_state = LUSTRE_IMP_REPLAY_LOCKS;
1872 body = lustre_msg_buf(req->rq_reqmsg, DLM_LOCKREQ_OFF, sizeof(*body));
1873 ldlm_lock2desc(lock, &body->lock_desc);
1874 body->lock_flags = flags;
1876 ldlm_lock2handle(lock, &body->lock_handle[0]);
1877 size[DLM_LOCKREPLY_OFF] = sizeof(*reply);
1878 if (lock->l_lvb_len != 0) {
1880 size[DLM_REPLY_REC_OFF] = lock->l_lvb_len;
1882 ptlrpc_req_set_repsize(req, buffers, size);
1883 /* notify the server we've replayed all requests.
1884 * also, we mark the request to be put on a dedicated
1885 * queue to be processed after all request replayes.
1887 lustre_msg_set_flags(req->rq_reqmsg, MSG_REQ_REPLAY_DONE);
1889 LDLM_DEBUG(lock, "replaying lock:");
1891 atomic_inc(&req->rq_import->imp_replay_inflight);
1892 CLASSERT(sizeof(*aa) <= sizeof(req->rq_async_args));
1893 aa = (struct ldlm_async_args *)&req->rq_async_args;
1894 aa->lock_handle = body->lock_handle[0];
1895 req->rq_interpret_reply = replay_lock_interpret;
1896 ptlrpcd_add_req(req);
1901 int ldlm_replay_locks(struct obd_import *imp)
1903 struct ldlm_namespace *ns = imp->imp_obd->obd_namespace;
1904 struct list_head list;
1905 struct ldlm_lock *lock, *next;
1909 CFS_INIT_LIST_HEAD(&list);
1911 LASSERT(atomic_read(&imp->imp_replay_inflight) == 0);
1913 /* ensure this doesn't fall to 0 before all have been queued */
1914 atomic_inc(&imp->imp_replay_inflight);
1916 (void)ldlm_namespace_foreach(ns, ldlm_chain_lock_for_replay, &list);
1918 list_for_each_entry_safe(lock, next, &list, l_pending_chain) {
1919 list_del_init(&lock->l_pending_chain);
1921 continue; /* or try to do the rest? */
1922 rc = replay_one_lock(imp, lock);
1925 atomic_dec(&imp->imp_replay_inflight);