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 "CFS_TIME_T", "
65 CFS_DURATION_T"s ago); not entering recovery in "
66 "server code, just going back to sleep",
67 lock->l_enqueued_time.tv_sec,
68 cfs_time_current_sec() - lock->l_enqueued_time.tv_sec);
69 if (cfs_time_after(cfs_time_current(), next_dump)) {
70 last_dump = next_dump;
71 next_dump = cfs_time_shift(300);
72 ldlm_namespace_dump(D_DLMTRACE,
73 lock->l_resource->lr_namespace);
75 libcfs_debug_dumplog();
80 obd = lock->l_conn_export->exp_obd;
81 imp = obd->u.cli.cl_import;
82 ptlrpc_fail_import(imp, lwd->lwd_conn_cnt);
83 LDLM_ERROR(lock, "lock timed out (enqueued at "CFS_TIME_T", "
84 CFS_DURATION_T"s ago), entering recovery for %s@%s",
85 lock->l_enqueued_time.tv_sec,
86 cfs_time_current_sec() - lock->l_enqueued_time.tv_sec,
87 obd2cli_tgt(obd), imp->imp_connection->c_remote_uuid.uuid);
92 static int is_granted_or_cancelled(struct ldlm_lock *lock)
96 lock_res_and_lock(lock);
97 if (((lock->l_req_mode == lock->l_granted_mode) &&
98 !(lock->l_flags & LDLM_FL_CP_REQD)) ||
99 (lock->l_flags & LDLM_FL_FAILED))
101 unlock_res_and_lock(lock);
106 int ldlm_completion_ast(struct ldlm_lock *lock, int flags, void *data)
108 /* XXX ALLOCATE - 160 bytes */
109 struct lock_wait_data lwd;
110 struct obd_device *obd;
111 struct obd_import *imp = NULL;
112 struct l_wait_info lwi;
116 if (flags == LDLM_FL_WAIT_NOREPROC) {
117 LDLM_DEBUG(lock, "client-side enqueue waiting on pending lock");
121 if (!(flags & (LDLM_FL_BLOCK_WAIT | LDLM_FL_BLOCK_GRANTED |
122 LDLM_FL_BLOCK_CONV))) {
123 cfs_waitq_signal(&lock->l_waitq);
127 LDLM_DEBUG(lock, "client-side enqueue returned a blocked lock, "
129 ldlm_lock_dump(D_OTHER, lock, 0);
130 ldlm_reprocess_all(lock->l_resource);
134 obd = class_exp2obd(lock->l_conn_export);
136 /* if this is a local lock, then there is no import */
138 imp = obd->u.cli.cl_import;
142 if (lock->l_flags & LDLM_FL_NO_TIMEOUT) {
143 LDLM_DEBUG(lock, "waiting indefinitely because of NO_TIMEOUT");
144 lwi = LWI_INTR(interrupted_completion_wait, &lwd);
146 lwi = LWI_TIMEOUT_INTR(cfs_time_seconds(obd_timeout),
147 ldlm_expired_completion_wait,
148 interrupted_completion_wait, &lwd);
152 spin_lock(&imp->imp_lock);
153 lwd.lwd_conn_cnt = imp->imp_conn_cnt;
154 spin_unlock(&imp->imp_lock);
157 /* Go to sleep until the lock is granted or cancelled. */
158 rc = l_wait_event(lock->l_waitq, is_granted_or_cancelled(lock), &lwi);
160 if (lock->l_destroyed || lock->l_flags & LDLM_FL_FAILED) {
161 LDLM_DEBUG(lock, "client-side enqueue waking up: destroyed");
166 LDLM_DEBUG(lock, "client-side enqueue waking up: failed (%d)",
171 LDLM_DEBUG(lock, "client-side enqueue waking up: granted");
176 * ->l_blocking_ast() callback for LDLM locks acquired by server-side OBDs.
178 int ldlm_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
179 void *data, int flag)
184 if (flag == LDLM_CB_CANCELING) {
185 /* Don't need to do anything here. */
189 lock_res_and_lock(lock);
190 /* Get this: if ldlm_blocking_ast is racing with intent_policy, such
191 * that ldlm_blocking_ast is called just before intent_policy method
192 * takes the ns_lock, then by the time we get the lock, we might not
193 * be the correct blocking function anymore. So check, and return
195 if (lock->l_blocking_ast != ldlm_blocking_ast) {
196 unlock_res_and_lock(lock);
200 lock->l_flags |= LDLM_FL_CBPENDING;
201 do_ast = (!lock->l_readers && !lock->l_writers);
202 unlock_res_and_lock(lock);
205 struct lustre_handle lockh;
208 LDLM_DEBUG(lock, "already unused, calling ldlm_cli_cancel");
209 ldlm_lock2handle(lock, &lockh);
210 rc = ldlm_cli_cancel(&lockh);
212 CERROR("ldlm_cli_cancel: %d\n", rc);
214 LDLM_DEBUG(lock, "Lock still has references, will be "
221 * ->l_glimpse_ast() for DLM extent locks acquired on the server-side. See
222 * comment in filter_intent_policy() on why you may need this.
224 int ldlm_glimpse_ast(struct ldlm_lock *lock, void *reqp)
227 * Returning -ELDLM_NO_LOCK_DATA actually works, but the reason for
228 * that is rather subtle: with OST-side locking, it may so happen that
229 * _all_ extent locks are held by the OST. If client wants to obtain
230 * current file size it calls ll{,u}_glimpse_size(), and (as locks are
231 * on the server), dummy glimpse callback fires and does
232 * nothing. Client still receives correct file size due to the
233 * following fragment in filter_intent_policy():
235 * rc = l->l_glimpse_ast(l, NULL); // this will update the LVB
236 * if (rc != 0 && res->lr_namespace->ns_lvbo &&
237 * res->lr_namespace->ns_lvbo->lvbo_update) {
238 * res->lr_namespace->ns_lvbo->lvbo_update(res, NULL, 0, 1);
241 * that is, after glimpse_ast() fails, filter_lvbo_update() runs, and
242 * returns correct file size to the client.
244 return -ELDLM_NO_LOCK_DATA;
247 int ldlm_cli_enqueue_local(struct ldlm_namespace *ns,
248 const struct ldlm_res_id *res_id,
249 ldlm_type_t type, ldlm_policy_data_t *policy,
250 ldlm_mode_t mode, int *flags,
251 ldlm_blocking_callback blocking,
252 ldlm_completion_callback completion,
253 ldlm_glimpse_callback glimpse,
254 void *data, __u32 lvb_len, void *lvb_swabber,
255 struct lustre_handle *lockh)
257 struct ldlm_lock *lock;
261 LASSERT(!(*flags & LDLM_FL_REPLAY));
262 if (unlikely(ns_is_client(ns))) {
263 CERROR("Trying to enqueue local lock in a shadow namespace\n");
267 lock = ldlm_lock_create(ns, res_id, type, mode, blocking,
268 completion, glimpse, data, lvb_len);
270 GOTO(out_nolock, err = -ENOMEM);
271 LDLM_DEBUG(lock, "client-side local enqueue handler, new lock created");
273 ldlm_lock_addref_internal(lock, mode);
274 ldlm_lock2handle(lock, lockh);
275 lock_res_and_lock(lock);
276 lock->l_flags |= LDLM_FL_LOCAL;
277 if (*flags & LDLM_FL_ATOMIC_CB)
278 lock->l_flags |= LDLM_FL_ATOMIC_CB;
279 lock->l_lvb_swabber = lvb_swabber;
280 unlock_res_and_lock(lock);
282 lock->l_policy_data = *policy;
283 if (type == LDLM_EXTENT)
284 lock->l_req_extent = policy->l_extent;
286 err = ldlm_lock_enqueue(ns, &lock, policy, flags);
287 if (unlikely(err != ELDLM_OK))
291 *policy = lock->l_policy_data;
293 LDLM_DEBUG_NOLOCK("client-side local enqueue handler END (lock %p)",
296 if (lock->l_completion_ast)
297 lock->l_completion_ast(lock, *flags, NULL);
299 LDLM_DEBUG(lock, "client-side local enqueue END");
307 static void failed_lock_cleanup(struct ldlm_namespace *ns,
308 struct ldlm_lock *lock,
309 struct lustre_handle *lockh, int mode)
311 /* Set a flag to prevent us from sending a CANCEL (bug 407) */
312 lock_res_and_lock(lock);
313 lock->l_flags |= LDLM_FL_LOCAL_ONLY;
314 unlock_res_and_lock(lock);
315 LDLM_DEBUG(lock, "setting FL_LOCAL_ONLY");
317 ldlm_lock_decref_and_cancel(lockh, mode);
319 /* XXX - HACK because we shouldn't call ldlm_lock_destroy()
320 * from llite/file.c/ll_file_flock(). */
321 if (lock->l_resource->lr_type == LDLM_FLOCK) {
322 ldlm_lock_destroy(lock);
326 int ldlm_cli_enqueue_fini(struct obd_export *exp, struct ptlrpc_request *req,
327 ldlm_type_t type, __u8 with_policy, ldlm_mode_t mode,
328 int *flags, void *lvb, __u32 lvb_len,
329 void *lvb_swabber, struct lustre_handle *lockh,int rc)
331 struct ldlm_namespace *ns = exp->exp_obd->obd_namespace;
332 int is_replay = *flags & LDLM_FL_REPLAY;
333 struct ldlm_lock *lock;
334 struct ldlm_reply *reply;
335 int cleanup_phase = 1;
338 lock = ldlm_handle2lock(lockh);
339 /* ldlm_cli_enqueue is holding a reference on this lock. */
341 LASSERT(type == LDLM_FLOCK);
345 if (rc != ELDLM_OK) {
347 LDLM_DEBUG(lock, "client-side enqueue END (%s)",
348 rc == ELDLM_LOCK_ABORTED ? "ABORTED" : "FAILED");
349 if (rc == ELDLM_LOCK_ABORTED) {
350 /* Before we return, swab the reply */
351 reply = req_capsule_server_get(&req->rq_pill,
356 struct ost_lvb *tmplvb;
358 req_capsule_set_size(&req->rq_pill,
359 &RMF_DLM_LVB, RCL_SERVER,
361 tmplvb = req_capsule_server_swab_get(&req->rq_pill,
365 GOTO(cleanup, rc = -EPROTO);
367 memcpy(lvb, tmplvb, lvb_len);
373 reply = req_capsule_server_get(&req->rq_pill, &RMF_DLM_REP);
375 GOTO(cleanup, rc = -EPROTO);
377 /* lock enqueued on the server */
380 lock_res_and_lock(lock);
381 lock->l_remote_handle = reply->lock_handle;
382 *flags = reply->lock_flags;
383 lock->l_flags |= reply->lock_flags & LDLM_INHERIT_FLAGS;
384 /* move NO_TIMEOUT flag to the lock to force ldlm_lock_match()
385 * to wait with no timeout as well */
386 lock->l_flags |= reply->lock_flags & LDLM_FL_NO_TIMEOUT;
387 unlock_res_and_lock(lock);
389 CDEBUG(D_INFO, "local: %p, remote cookie: "LPX64", flags: 0x%x\n",
390 lock, reply->lock_handle.cookie, *flags);
392 /* If enqueue returned a blocked lock but the completion handler has
393 * already run, then it fixed up the resource and we don't need to do it
395 if ((*flags) & LDLM_FL_LOCK_CHANGED) {
396 int newmode = reply->lock_desc.l_req_mode;
398 if (newmode && newmode != lock->l_req_mode) {
399 LDLM_DEBUG(lock, "server returned different mode %s",
400 ldlm_lockname[newmode]);
401 lock->l_req_mode = newmode;
404 if (memcmp(reply->lock_desc.l_resource.lr_name.name,
405 lock->l_resource->lr_name.name,
406 sizeof(struct ldlm_res_id))) {
407 CDEBUG(D_INFO, "remote intent success, locking "
408 "(%ld,%ld,%ld) instead of "
410 (long)reply->lock_desc.l_resource.lr_name.name[0],
411 (long)reply->lock_desc.l_resource.lr_name.name[1],
412 (long)reply->lock_desc.l_resource.lr_name.name[2],
413 (long)lock->l_resource->lr_name.name[0],
414 (long)lock->l_resource->lr_name.name[1],
415 (long)lock->l_resource->lr_name.name[2]);
417 rc = ldlm_lock_change_resource(ns, lock,
418 &reply->lock_desc.l_resource.lr_name);
419 if (rc || lock->l_resource == NULL)
420 GOTO(cleanup, rc = -ENOMEM);
421 LDLM_DEBUG(lock, "client-side enqueue, new resource");
424 if (!(type == LDLM_IBITS && !(exp->exp_connect_flags &
426 lock->l_policy_data =
427 reply->lock_desc.l_policy_data;
428 if (type != LDLM_PLAIN)
429 LDLM_DEBUG(lock,"client-side enqueue, new policy data");
432 if ((*flags) & LDLM_FL_AST_SENT ||
433 /* Cancel extent locks as soon as possible on a liblustre client,
434 * because it cannot handle asynchronous ASTs robustly (see
436 (LIBLUSTRE_CLIENT && type == LDLM_EXTENT)) {
437 lock_res_and_lock(lock);
438 lock->l_flags |= LDLM_FL_CBPENDING | LDLM_FL_BL_AST;
439 unlock_res_and_lock(lock);
440 LDLM_DEBUG(lock, "enqueue reply includes blocking AST");
443 /* If the lock has already been granted by a completion AST, don't
444 * clobber the LVB with an older one. */
445 if (lvb_len && (lock->l_req_mode != lock->l_granted_mode)) {
448 req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB, RCL_SERVER,
450 tmplvb = req_capsule_server_swab_get(&req->rq_pill,
454 GOTO(cleanup, rc = -EPROTO);
455 memcpy(lock->l_lvb_data, tmplvb, lvb_len);
459 rc = ldlm_lock_enqueue(ns, &lock, NULL, flags);
460 if (lock->l_completion_ast != NULL) {
461 int err = lock->l_completion_ast(lock, *flags, NULL);
464 if (rc && type != LDLM_FLOCK) /* bug 9425, bug 10250 */
469 if (lvb_len && lvb != NULL) {
470 /* Copy the LVB here, and not earlier, because the completion
471 * AST (if any) can override what we got in the reply */
472 memcpy(lvb, lock->l_lvb_data, lvb_len);
475 LDLM_DEBUG(lock, "client-side enqueue END");
478 if (cleanup_phase == 1 && rc)
479 failed_lock_cleanup(ns, lock, lockh, mode);
480 /* Put lock 2 times, the second reference is held by ldlm_cli_enqueue */
486 /* PAGE_SIZE-512 is to allow TCP/IP and LNET headers to fit into
487 * a single page on the send/receive side. XXX: 512 should be changed
488 * to more adequate value. */
489 static inline int ldlm_req_handles_avail(int req_size, int off)
493 avail = min_t(int, LDLM_MAXREQSIZE, CFS_PAGE_SIZE - 512) - req_size;
494 avail /= sizeof(struct lustre_handle);
495 avail += LDLM_LOCKREQ_HANDLES - off;
500 static inline int ldlm_capsule_handles_avail(struct req_capsule *pill,
501 enum req_location loc,
504 int size = req_capsule_msg_size(pill, loc);
505 return ldlm_req_handles_avail(size, off);
508 static inline int ldlm_format_handles_avail(struct obd_import *imp,
509 const struct req_format *fmt,
510 enum req_location loc, int off)
512 int size = req_capsule_fmt_size(imp->imp_msg_magic, fmt, loc);
513 return ldlm_req_handles_avail(size, off);
516 /* Cancel lru locks and pack them into the enqueue request. Pack there the given
517 * @count locks in @cancels. */
518 int ldlm_prep_elc_req(struct obd_export *exp, struct ptlrpc_request *req,
519 int version, int opc, int canceloff,
520 struct list_head *cancels, int count)
522 struct ldlm_namespace *ns = exp->exp_obd->obd_namespace;
523 struct req_capsule *pill = &req->rq_pill;
524 struct ldlm_request *dlm = NULL;
525 int flags, avail, to_free, bufcount, pack = 0;
532 if (exp_connect_cancelset(exp)) {
533 /* Estimate the amount of available space in the request. */
534 bufcount = req_capsule_filled_sizes(pill, RCL_CLIENT);
535 avail = ldlm_capsule_handles_avail(pill, RCL_CLIENT, canceloff);
537 flags = ns_connect_lru_resize(ns) ?
538 LDLM_CANCEL_LRUR : LDLM_CANCEL_AGED;
539 to_free = !ns_connect_lru_resize(ns) &&
540 opc == LDLM_ENQUEUE ? 1 : 0;
542 /* Cancel lru locks here _only_ if the server supports
543 * EARLY_CANCEL. Otherwise we have to send extra CANCEL
544 * rpc, what will make us slower. */
546 count += ldlm_cancel_lru_local(ns, cancels, to_free,
547 avail - count, 0, flags);
552 req_capsule_set_size(pill, &RMF_DLM_REQ, RCL_CLIENT,
553 ldlm_request_bufsize(pack, opc));
556 rc = ptlrpc_request_pack(req, version, opc);
558 ldlm_lock_list_put(cancels, l_bl_ast, count);
562 if (exp_connect_cancelset(exp)) {
564 dlm = req_capsule_client_get(pill, &RMF_DLM_REQ);
566 /* Skip first lock handler in ldlm_request_pack(),
567 * this method will incrment @lock_count according
568 * to the lock handle amount actually written to
570 dlm->lock_count = canceloff;
572 /* Pack into the request @pack lock handles. */
573 ldlm_cli_cancel_list(cancels, pack, req, 0);
574 /* Prepare and send separate cancel rpc for others. */
575 ldlm_cli_cancel_list(cancels, count - pack, NULL, 0);
577 ldlm_lock_list_put(cancels, l_bl_ast, count);
582 int ldlm_prep_enqueue_req(struct obd_export *exp, struct ptlrpc_request *req,
583 struct list_head *cancels, int count)
585 return ldlm_prep_elc_req(exp, req, LUSTRE_DLM_VERSION, LDLM_ENQUEUE,
586 LDLM_ENQUEUE_CANCEL_OFF, cancels, count);
589 /* If a request has some specific initialisation it is passed in @reqp,
590 * otherwise it is created in ldlm_cli_enqueue.
592 * Supports sync and async requests, pass @async flag accordingly. If a
593 * request was created in ldlm_cli_enqueue and it is the async request,
594 * pass it to the caller in @reqp. */
595 int ldlm_cli_enqueue(struct obd_export *exp, struct ptlrpc_request **reqp,
596 struct ldlm_enqueue_info *einfo,
597 const struct ldlm_res_id *res_id,
598 ldlm_policy_data_t *policy, int *flags,
599 void *lvb, __u32 lvb_len, void *lvb_swabber,
600 struct lustre_handle *lockh, int async)
602 struct ldlm_namespace *ns = exp->exp_obd->obd_namespace;
603 struct ldlm_lock *lock;
604 struct ldlm_request *body;
605 int is_replay = *flags & LDLM_FL_REPLAY;
606 int req_passed_in = 1;
608 struct ptlrpc_request *req;
611 LASSERT(exp != NULL);
613 /* If we're replaying this lock, just check some invariants.
614 * If we're creating a new lock, get everything all setup nice. */
616 lock = ldlm_handle2lock(lockh);
617 LASSERT(lock != NULL);
618 LDLM_DEBUG(lock, "client-side enqueue START");
619 LASSERT(exp == lock->l_conn_export);
621 lock = ldlm_lock_create(ns, res_id, einfo->ei_type,
622 einfo->ei_mode, einfo->ei_cb_bl,
623 einfo->ei_cb_cp, einfo->ei_cb_gl,
624 einfo->ei_cbdata, lvb_len);
627 /* for the local lock, add the reference */
628 ldlm_lock_addref_internal(lock, einfo->ei_mode);
629 ldlm_lock2handle(lock, lockh);
630 lock->l_lvb_swabber = lvb_swabber;
631 if (policy != NULL) {
632 /* INODEBITS_INTEROP: If the server does not support
633 * inodebits, we will request a plain lock in the
634 * descriptor (ldlm_lock2desc() below) but use an
635 * inodebits lock internally with both bits set.
637 if (einfo->ei_type == LDLM_IBITS &&
638 !(exp->exp_connect_flags & OBD_CONNECT_IBITS))
639 lock->l_policy_data.l_inodebits.bits =
640 MDS_INODELOCK_LOOKUP |
641 MDS_INODELOCK_UPDATE;
643 lock->l_policy_data = *policy;
646 if (einfo->ei_type == LDLM_EXTENT)
647 lock->l_req_extent = policy->l_extent;
648 LDLM_DEBUG(lock, "client-side enqueue START");
651 /* lock not sent to server yet */
653 if (reqp == NULL || *reqp == NULL) {
654 req = ptlrpc_request_alloc_pack(class_exp2cliimp(exp),
659 failed_lock_cleanup(ns, lock, lockh, einfo->ei_mode);
670 len = req_capsule_get_size(&req->rq_pill, &RMF_DLM_REQ,
672 LASSERTF(len >= sizeof(*body), "buflen[%d] = %d, not %d\n",
673 DLM_LOCKREQ_OFF, len, sizeof(*body));
676 lock->l_conn_export = exp;
677 lock->l_export = NULL;
678 lock->l_blocking_ast = einfo->ei_cb_bl;
680 /* Dump lock data into the request buffer */
681 body = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
682 ldlm_lock2desc(lock, &body->lock_desc);
683 body->lock_flags = *flags;
684 body->lock_handle[0] = *lockh;
686 /* Continue as normal. */
687 if (!req_passed_in) {
689 req_capsule_extend(&req->rq_pill,
690 &RQF_LDLM_ENQUEUE_LVB);
691 req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB,
692 RCL_SERVER, lvb_len);
694 ptlrpc_request_set_replen(req);
698 * Liblustre client doesn't get extent locks, except for O_APPEND case
699 * where [0, OBD_OBJECT_EOF] lock is taken, or truncate, where
700 * [i_size, OBD_OBJECT_EOF] lock is taken.
702 LASSERT(ergo(LIBLUSTRE_CLIENT, einfo->ei_type != LDLM_EXTENT ||
703 policy->l_extent.end == OBD_OBJECT_EOF));
706 LASSERT(reqp != NULL);
710 LDLM_DEBUG(lock, "sending request");
711 rc = ptlrpc_queue_wait(req);
712 err = ldlm_cli_enqueue_fini(exp, req, einfo->ei_type, policy ? 1 : 0,
713 einfo->ei_mode, flags, lvb, lvb_len,
714 lvb_swabber, lockh, rc);
716 /* If ldlm_cli_enqueue_fini did not find the lock, we need to free
717 * one reference that we took */
723 if (!req_passed_in && req != NULL) {
724 ptlrpc_req_finished(req);
732 static int ldlm_cli_convert_local(struct ldlm_lock *lock, int new_mode,
735 struct ldlm_resource *res;
738 if (ns_is_client(lock->l_resource->lr_namespace)) {
739 CERROR("Trying to cancel local lock\n");
742 LDLM_DEBUG(lock, "client-side local convert");
744 res = ldlm_lock_convert(lock, new_mode, flags);
746 ldlm_reprocess_all(res);
751 LDLM_DEBUG(lock, "client-side local convert handler END");
756 /* FIXME: one of ldlm_cli_convert or the server side should reject attempted
757 * conversion of locks which are on the waiting or converting queue */
758 /* Caller of this code is supposed to take care of lock readers/writers
760 int ldlm_cli_convert(struct lustre_handle *lockh, int new_mode, __u32 *flags)
762 struct ldlm_request *body;
763 struct ldlm_reply *reply;
764 struct ldlm_lock *lock;
765 struct ldlm_resource *res;
766 struct ptlrpc_request *req;
770 lock = ldlm_handle2lock(lockh);
777 if (lock->l_conn_export == NULL)
778 RETURN(ldlm_cli_convert_local(lock, new_mode, flags));
780 LDLM_DEBUG(lock, "client-side convert");
782 req = ptlrpc_request_alloc_pack(class_exp2cliimp(lock->l_conn_export),
783 &RQF_LDLM_CONVERT, LUSTRE_DLM_VERSION,
790 body = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
791 body->lock_handle[0] = lock->l_remote_handle;
793 body->lock_desc.l_req_mode = new_mode;
794 body->lock_flags = *flags;
797 ptlrpc_request_set_replen(req);
798 rc = ptlrpc_queue_wait(req);
802 reply = req_capsule_server_get(&req->rq_pill, &RMF_DLM_REP);
804 GOTO(out, rc = -EPROTO);
807 GOTO(out, rc = req->rq_status);
809 res = ldlm_lock_convert(lock, new_mode, &reply->lock_flags);
811 ldlm_reprocess_all(res);
812 /* Go to sleep until the lock is granted. */
813 /* FIXME: or cancelled. */
814 if (lock->l_completion_ast) {
815 rc = lock->l_completion_ast(lock, LDLM_FL_WAIT_NOREPROC,
826 ptlrpc_req_finished(req);
830 /* Cancel locks locally.
832 * LDLM_FL_LOCAL_ONLY if tere is no need in a CANCEL rpc to the server;
833 * LDLM_FL_CANCELING otherwise;
834 * LDLM_FL_BL_AST if there is a need in a separate CANCEL rpc. */
835 static int ldlm_cli_cancel_local(struct ldlm_lock *lock)
837 int rc = LDLM_FL_LOCAL_ONLY;
840 if (lock->l_conn_export) {
843 LDLM_DEBUG(lock, "client-side cancel");
844 /* Set this flag to prevent others from getting new references*/
845 lock_res_and_lock(lock);
846 lock->l_flags |= LDLM_FL_CBPENDING;
847 local_only = (lock->l_flags &
848 (LDLM_FL_LOCAL_ONLY|LDLM_FL_CANCEL_ON_BLOCK));
849 ldlm_cancel_callback(lock);
850 rc = (lock->l_flags & LDLM_FL_BL_AST) ?
851 LDLM_FL_BL_AST : LDLM_FL_CANCELING;
852 unlock_res_and_lock(lock);
855 CDEBUG(D_DLMTRACE, "not sending request (at caller's "
857 rc = LDLM_FL_LOCAL_ONLY;
859 ldlm_lock_cancel(lock);
861 if (ns_is_client(lock->l_resource->lr_namespace)) {
862 LDLM_ERROR(lock, "Trying to cancel local lock");
865 LDLM_DEBUG(lock, "server-side local cancel");
866 ldlm_lock_cancel(lock);
867 ldlm_reprocess_all(lock->l_resource);
868 LDLM_DEBUG(lock, "server-side local cancel handler END");
874 /* Pack @count locks in @head into ldlm_request buffer at the offset @off,
875 of the request @req. */
876 static void ldlm_cancel_pack(struct ptlrpc_request *req,
877 struct list_head *head, int count)
879 struct ldlm_request *dlm;
880 struct ldlm_lock *lock;
884 dlm = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
885 LASSERT(dlm != NULL);
887 /* Check the room in the request buffer. */
888 max = req_capsule_get_size(&req->rq_pill, &RMF_DLM_REQ, RCL_CLIENT) -
889 sizeof(struct ldlm_request);
890 max /= sizeof(struct lustre_handle);
891 max += LDLM_LOCKREQ_HANDLES;
892 LASSERT(max >= dlm->lock_count + count);
894 /* XXX: it would be better to pack lock handles grouped by resource.
895 * so that the server cancel would call filter_lvbo_update() less
897 list_for_each_entry(lock, head, l_bl_ast) {
900 LASSERT(lock->l_conn_export);
901 /* Pack the lock handle to the given request buffer. */
902 LDLM_DEBUG(lock, "packing");
903 dlm->lock_handle[dlm->lock_count++] = lock->l_remote_handle;
906 CDEBUG(D_DLMTRACE, "%d locks packed\n", packed);
910 /* Prepare and send a batched cancel rpc, it will include count lock handles
911 * of locks given in @head. */
912 int ldlm_cli_cancel_req(struct obd_export *exp, struct list_head *cancels,
913 int count, int flags)
915 struct ptlrpc_request *req = NULL;
916 struct obd_import *imp;
921 LASSERT(exp != NULL);
924 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_CANCEL_RACE))
927 free = ldlm_format_handles_avail(class_exp2cliimp(exp),
928 &RQF_LDLM_CANCEL, RCL_CLIENT, 0);
935 imp = class_exp2cliimp(exp);
936 if (imp == NULL || imp->imp_invalid) {
938 "skipping cancel on invalid import %p\n", imp);
942 req = ptlrpc_request_alloc(imp, &RQF_LDLM_CANCEL);
944 GOTO(out, rc = -ENOMEM);
946 bufcount = req_capsule_filled_sizes(&req->rq_pill, RCL_CLIENT);
947 req_capsule_set_size(&req->rq_pill, &RMF_DLM_REQ, RCL_CLIENT,
948 ldlm_request_bufsize(count, LDLM_CANCEL));
950 rc = ptlrpc_request_pack(req, LUSTRE_DLM_VERSION, LDLM_CANCEL);
952 ptlrpc_request_free(req);
955 req->rq_no_resend = 1;
956 req->rq_no_delay = 1;
958 /* XXX FIXME bug 249 */
959 req->rq_request_portal = LDLM_CANCEL_REQUEST_PORTAL;
960 req->rq_reply_portal = LDLM_CANCEL_REPLY_PORTAL;
962 ldlm_cancel_pack(req, cancels, count);
964 ptlrpc_request_set_replen(req);
965 if (flags & LDLM_FL_ASYNC) {
966 ptlrpcd_add_req(req);
970 rc = ptlrpc_queue_wait(req);
973 CDEBUG(D_DLMTRACE, "client/server (nid %s) "
974 "out of sync -- not fatal\n",
975 libcfs_nid2str(req->rq_import->
976 imp_connection->c_peer.nid));
978 } else if (rc == -ETIMEDOUT && /* check there was no reconnect*/
979 req->rq_import_generation == imp->imp_generation) {
980 ptlrpc_req_finished(req);
982 } else if (rc != ELDLM_OK) {
983 CERROR("Got rc %d from cancel RPC: canceling "
991 ptlrpc_req_finished(req);
994 return sent ? sent : rc;
997 static inline struct ldlm_pool *ldlm_imp2pl(struct obd_import *imp)
999 LASSERT(imp != NULL);
1000 return &imp->imp_obd->obd_namespace->ns_pool;
1004 * Update client's obd pool related fields with new SLV and Limit from \a req.
1006 int ldlm_cli_update_pool(struct ptlrpc_request *req)
1008 struct obd_device *obd;
1009 __u64 old_slv, new_slv;
1013 if (unlikely(!req->rq_import || !req->rq_import->imp_obd ||
1014 !imp_connect_lru_resize(req->rq_import)))
1017 * Do nothing for corner cases.
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
1029 if (lustre_msg_get_slv(req->rq_repmsg) == 0 ||
1030 lustre_msg_get_limit(req->rq_repmsg) == 0) {
1031 DEBUG_REQ(D_HA, req, "Zero SLV or Limit found "
1032 "(SLV: "LPU64", Limit: %u)",
1033 lustre_msg_get_slv(req->rq_repmsg),
1034 lustre_msg_get_limit(req->rq_repmsg));
1038 new_limit = lustre_msg_get_limit(req->rq_repmsg);
1039 new_slv = lustre_msg_get_slv(req->rq_repmsg);
1040 obd = req->rq_import->imp_obd;
1043 * Set new SLV and Limit to obd fields to make accessible for pool
1044 * thread. We do not access obd_namespace and pool directly here
1045 * as there is no reliable way to make sure that they are still
1046 * alive in cleanup time. Evil races are possible which may cause
1047 * oops in that time.
1049 write_lock(&obd->obd_pool_lock);
1050 old_slv = obd->obd_pool_slv;
1051 obd->obd_pool_slv = new_slv;
1052 obd->obd_pool_limit = new_limit;
1053 write_unlock(&obd->obd_pool_lock);
1056 * Check if we need to wakeup pools thread for fast SLV change.
1057 * This is only done when threads period is noticably long like
1060 #if defined(__KERNEL__) && (LDLM_POOLS_THREAD_PERIOD >= 10)
1062 __u64 fast_change = old_slv * LDLM_POOLS_FAST_SLV_CHANGE;
1063 do_div(fast_change, 100);
1066 * Wake up pools thread only if SLV has changed more than
1067 * 50% since last update. In this case we want to react asap.
1068 * Otherwise it is no sense to wake up pools as they are
1069 * re-calculated every LDLM_POOLS_THREAD_PERIOD anyways.
1071 if (old_slv > new_slv && old_slv - new_slv > fast_change)
1072 ldlm_pools_wakeup();
1077 EXPORT_SYMBOL(ldlm_cli_update_pool);
1079 int ldlm_cli_cancel(struct lustre_handle *lockh)
1081 struct obd_export *exp;
1082 int avail, flags, count = 1, rc = 0;
1083 struct ldlm_namespace *ns;
1084 struct ldlm_lock *lock;
1085 CFS_LIST_HEAD(cancels);
1088 /* concurrent cancels on the same handle can happen */
1089 lock = __ldlm_handle2lock(lockh, LDLM_FL_CANCELING);
1091 LDLM_DEBUG_NOLOCK("lock is already being destroyed\n");
1095 rc = ldlm_cli_cancel_local(lock);
1096 if (rc < 0 || rc == LDLM_FL_LOCAL_ONLY) {
1097 LDLM_LOCK_PUT(lock);
1098 RETURN(rc < 0 ? rc : 0);
1100 /* Even if the lock is marked as LDLM_FL_BL_AST, this is a LDLM_CANCEL
1101 * rpc which goes to canceld portal, so we can cancel other lru locks
1102 * here and send them all as one LDLM_CANCEL rpc. */
1103 LASSERT(list_empty(&lock->l_bl_ast));
1104 list_add(&lock->l_bl_ast, &cancels);
1106 exp = lock->l_conn_export;
1107 if (exp_connect_cancelset(exp)) {
1108 avail = ldlm_format_handles_avail(class_exp2cliimp(exp),
1113 ns = lock->l_resource->lr_namespace;
1114 flags = ns_connect_lru_resize(ns) ?
1115 LDLM_CANCEL_LRUR : LDLM_CANCEL_AGED;
1116 count += ldlm_cancel_lru_local(ns, &cancels, 0, avail - 1,
1117 LDLM_FL_BL_AST, flags);
1119 ldlm_cli_cancel_list(&cancels, count, NULL, 0);
1123 /* XXX until we will have compound requests and can cut cancels from generic rpc
1124 * we need send cancels with LDLM_FL_BL_AST flag as separate rpc */
1125 static int ldlm_cancel_list(struct list_head *cancels, int count, int flags)
1127 CFS_LIST_HEAD(head);
1128 struct ldlm_lock *lock, *next;
1129 int left = 0, bl_ast = 0, rc;
1132 list_for_each_entry_safe(lock, next, cancels, l_bl_ast) {
1136 if (flags & LDLM_FL_LOCAL_ONLY) {
1137 rc = LDLM_FL_LOCAL_ONLY;
1138 ldlm_lock_cancel(lock);
1140 rc = ldlm_cli_cancel_local(lock);
1142 if (!(flags & LDLM_FL_BL_AST) && (rc == LDLM_FL_BL_AST)) {
1143 LDLM_DEBUG(lock, "Cancel lock separately");
1144 list_del_init(&lock->l_bl_ast);
1145 list_add(&lock->l_bl_ast, &head);
1149 if (rc == LDLM_FL_LOCAL_ONLY) {
1150 /* CANCEL RPC should not be sent to server. */
1151 list_del_init(&lock->l_bl_ast);
1152 LDLM_LOCK_PUT(lock);
1159 ldlm_cli_cancel_list(&head, bl_ast, NULL, 0);
1165 /* Return 1 to stop lru processing and keep current lock cached. Return zero
1167 static ldlm_policy_res_t ldlm_cancel_shrink_policy(struct ldlm_namespace *ns,
1168 struct ldlm_lock *lock,
1169 int unused, int added,
1175 /* Stop lru processing when we reached passed @count or checked all
1177 if (count && added >= count)
1178 return LDLM_POLICY_KEEP_LOCK;
1180 if (lock->l_resource->lr_type == LDLM_EXTENT) {
1181 struct ldlm_extent *l_extent;
1183 /* For all extent locks cost is 1 + number of pages in
1185 l_extent = &lock->l_policy_data.l_extent;
1186 page_nr = (l_extent->end - l_extent->start);
1187 do_div(page_nr, CFS_PAGE_SIZE);
1190 /* XXX: In fact this is evil hack, we can't access inode
1191 * here. For doing it right we need somehow to have number
1192 * of covered by lock. This should be fixed later when 10718
1194 if (lock->l_ast_data != NULL) {
1195 struct inode *inode = lock->l_ast_data;
1196 if (page_nr > inode->i_mapping->nrpages)
1197 page_nr = inode->i_mapping->nrpages;
1200 lock_cost = 1 + page_nr;
1202 /* For all locks which are not extent ones cost is 1 */
1206 /* Keep all expensive locks in lru for the memory pressure time
1207 * cancel policy. They anyways may be canceled by lru resize
1208 * pplicy if they have not small enough CLV. */
1209 return lock_cost > ns->ns_shrink_thumb ?
1210 LDLM_POLICY_KEEP_LOCK : LDLM_POLICY_CANCEL_LOCK;
1213 /* Return 1 to stop lru processing and keep current lock cached. Return zero
1215 static ldlm_policy_res_t ldlm_cancel_lrur_policy(struct ldlm_namespace *ns,
1216 struct ldlm_lock *lock,
1217 int unused, int added,
1220 cfs_time_t cur = cfs_time_current();
1221 struct ldlm_pool *pl = &ns->ns_pool;
1225 /* Stop lru processing when we reached passed @count or checked all
1227 if (count && added >= count)
1228 return LDLM_POLICY_KEEP_LOCK;
1230 slv = ldlm_pool_get_slv(pl);
1231 lvf = ldlm_pool_get_lvf(pl);
1232 la = cfs_duration_sec(cfs_time_sub(cur,
1233 lock->l_last_used));
1235 /* Stop when slv is not yet come from server or
1236 * lv is smaller than it is. */
1237 lv = lvf * la * unused;
1239 /* Inform pool about current CLV to see it via proc. */
1240 ldlm_pool_set_clv(pl, lv);
1241 return (slv == 1 || lv < slv) ?
1242 LDLM_POLICY_KEEP_LOCK : LDLM_POLICY_CANCEL_LOCK;
1245 /* Return 1 to stop lru processing and keep current lock cached. Return zero
1247 static ldlm_policy_res_t ldlm_cancel_passed_policy(struct ldlm_namespace *ns,
1248 struct ldlm_lock *lock,
1249 int unused, int added,
1252 /* Stop lru processing when we reached passed @count or checked all
1254 return (added >= count) ?
1255 LDLM_POLICY_KEEP_LOCK : LDLM_POLICY_CANCEL_LOCK;
1258 /* Return 1 to stop lru processing and keep current lock cached. Return zero
1260 static ldlm_policy_res_t ldlm_cancel_aged_policy(struct ldlm_namespace *ns,
1261 struct ldlm_lock *lock,
1262 int unused, int added,
1265 /* Stop lru processing if young lock is found and we reached passed
1267 return ((added >= count) &&
1268 cfs_time_before(cfs_time_current(),
1269 cfs_time_add(lock->l_last_used,
1271 LDLM_POLICY_KEEP_LOCK : LDLM_POLICY_CANCEL_LOCK;
1274 /* Return 1 to stop lru processing and keep current lock cached. Return zero
1276 static ldlm_policy_res_t ldlm_cancel_default_policy(struct ldlm_namespace *ns,
1277 struct ldlm_lock *lock,
1278 int unused, int added,
1281 /* Stop lru processing when we reached passed @count or checked all
1283 return (added >= count) ?
1284 LDLM_POLICY_KEEP_LOCK : LDLM_POLICY_CANCEL_LOCK;
1287 typedef ldlm_policy_res_t (*ldlm_cancel_lru_policy_t)(struct ldlm_namespace *,
1288 struct ldlm_lock *, int,
1291 static ldlm_cancel_lru_policy_t
1292 ldlm_cancel_lru_policy(struct ldlm_namespace *ns, int flags)
1294 if (ns_connect_lru_resize(ns)) {
1295 if (flags & LDLM_CANCEL_SHRINK)
1296 return ldlm_cancel_shrink_policy;
1297 else if (flags & LDLM_CANCEL_LRUR)
1298 return ldlm_cancel_lrur_policy;
1299 else if (flags & LDLM_CANCEL_PASSED)
1300 return ldlm_cancel_passed_policy;
1302 if (flags & LDLM_CANCEL_AGED)
1303 return ldlm_cancel_aged_policy;
1306 return ldlm_cancel_default_policy;
1309 /* - Free space in lru for @count new locks,
1310 * redundant unused locks are canceled locally;
1311 * - also cancel locally unused aged locks;
1312 * - do not cancel more than @max locks;
1313 * - GET the found locks and add them into the @cancels list.
1315 * A client lock can be added to the l_bl_ast list only when it is
1316 * marked LDLM_FL_CANCELING. Otherwise, somebody is already doing CANCEL.
1317 * There are the following use cases: ldlm_cancel_resource_local(),
1318 * ldlm_cancel_lru_local() and ldlm_cli_cancel(), which check&set this
1319 * flag properly. As any attempt to cancel a lock rely on this flag,
1320 * l_bl_ast list is accessed later without any special locking.
1322 * Calling policies for enabled lru resize:
1323 * ----------------------------------------
1324 * flags & LDLM_CANCEL_LRUR - use lru resize policy (SLV from server) to
1325 * cancel not more than @count locks;
1327 * flags & LDLM_CANCEL_PASSED - cancel @count number of old locks (located at
1328 * the beginning of lru list);
1330 * flags & LDLM_CANCEL_SHRINK - cancel not more than @count locks according to
1331 * memory pressre policy function;
1333 * flags & LDLM_CANCEL_AGED - cancel alocks according to "aged policy".
1335 int ldlm_cancel_lru_local(struct ldlm_namespace *ns, struct list_head *cancels,
1336 int count, int max, int cancel_flags, int flags)
1338 ldlm_cancel_lru_policy_t pf;
1339 struct ldlm_lock *lock, *next;
1340 int added = 0, unused;
1343 spin_lock(&ns->ns_unused_lock);
1344 unused = ns->ns_nr_unused;
1346 if (!ns_connect_lru_resize(ns))
1347 count += unused - ns->ns_max_unused;
1349 pf = ldlm_cancel_lru_policy(ns, flags);
1350 LASSERT(pf != NULL);
1352 while (!list_empty(&ns->ns_unused_list)) {
1353 /* For any flags, stop scanning if @max is reached. */
1354 if (max && added >= max)
1357 list_for_each_entry_safe(lock, next, &ns->ns_unused_list, l_lru){
1358 /* No locks which got blocking requests. */
1359 LASSERT(!(lock->l_flags & LDLM_FL_BL_AST));
1361 /* Somebody is already doing CANCEL. No need in this
1362 * lock in lru, do not traverse it again. */
1363 if (!(lock->l_flags & LDLM_FL_CANCELING))
1366 ldlm_lock_remove_from_lru_nolock(lock);
1368 if (&lock->l_lru == &ns->ns_unused_list)
1371 /* Pass the lock through the policy filter and see if it
1372 * should stay in lru.
1374 * Even for shrinker policy we stop scanning if
1375 * we find a lock that should stay in the cache.
1376 * We should take into account lock age anyway
1377 * as new lock even if it is small of weight is
1378 * valuable resource.
1380 * That is, for shrinker policy we drop only
1381 * old locks, but additionally chose them by
1382 * their weight. Big extent locks will stay in
1384 if (pf(ns, lock, unused, added, count) == LDLM_POLICY_KEEP_LOCK)
1387 LDLM_LOCK_GET(lock); /* dropped by bl thread */
1388 spin_unlock(&ns->ns_unused_lock);
1390 lock_res_and_lock(lock);
1391 /* Check flags again under the lock. */
1392 if ((lock->l_flags & LDLM_FL_CANCELING) ||
1393 (ldlm_lock_remove_from_lru(lock) == 0)) {
1394 /* other thread is removing lock from lru or
1395 * somebody is already doing CANCEL or
1396 * there is a blocking request which will send
1397 * cancel by itseft or the lock is matched
1398 * is already not unused. */
1399 unlock_res_and_lock(lock);
1400 LDLM_LOCK_PUT(lock);
1401 spin_lock(&ns->ns_unused_lock);
1404 LASSERT(!lock->l_readers && !lock->l_writers);
1406 /* If we have chosen to cancel this lock voluntarily, we
1407 * better send cancel notification to server, so that it
1408 * frees appropriate state. This might lead to a race
1409 * where while we are doing cancel here, server is also
1410 * silently cancelling this lock. */
1411 lock->l_flags &= ~LDLM_FL_CANCEL_ON_BLOCK;
1413 /* Setting the CBPENDING flag is a little misleading,
1414 * but prevents an important race; namely, once
1415 * CBPENDING is set, the lock can accumulate no more
1416 * readers/writers. Since readers and writers are
1417 * already zero here, ldlm_lock_decref() won't see
1418 * this flag and call l_blocking_ast */
1419 lock->l_flags |= LDLM_FL_CBPENDING | LDLM_FL_CANCELING;
1421 /* We can't re-add to l_lru as it confuses the
1422 * refcounting in ldlm_lock_remove_from_lru() if an AST
1423 * arrives after we drop ns_lock below. We use l_bl_ast
1424 * and can't use l_pending_chain as it is used both on
1425 * server and client nevertheless bug 5666 says it is
1426 * used only on server */
1427 LASSERT(list_empty(&lock->l_bl_ast));
1428 list_add(&lock->l_bl_ast, cancels);
1429 unlock_res_and_lock(lock);
1430 spin_lock(&ns->ns_unused_lock);
1434 spin_unlock(&ns->ns_unused_lock);
1435 RETURN(ldlm_cancel_list(cancels, added, cancel_flags));
1438 /* Returns number of locks which could be canceled next time when
1439 * ldlm_cancel_lru() is called. Used from locks pool shrinker. */
1440 int ldlm_cancel_lru_estimate(struct ldlm_namespace *ns,
1441 int count, int max, int flags)
1443 ldlm_cancel_lru_policy_t pf;
1444 struct ldlm_lock *lock;
1445 int added = 0, unused;
1448 pf = ldlm_cancel_lru_policy(ns, flags);
1449 LASSERT(pf != NULL);
1450 spin_lock(&ns->ns_unused_lock);
1451 unused = ns->ns_nr_unused;
1453 list_for_each_entry(lock, &ns->ns_unused_list, l_lru) {
1454 /* For any flags, stop scanning if @max is reached. */
1455 if (max && added >= max)
1458 /* Somebody is already doing CANCEL or there is a
1459 * blocking request will send cancel. Let's not count
1461 if ((lock->l_flags & LDLM_FL_CANCELING) ||
1462 (lock->l_flags & LDLM_FL_BL_AST))
1465 /* Pass the lock through the policy filter and see if it
1466 * should stay in lru. */
1467 if (pf(ns, lock, unused, added, count) == LDLM_POLICY_KEEP_LOCK)
1473 spin_unlock(&ns->ns_unused_lock);
1477 /* when called with LDLM_ASYNC the blocking callback will be handled
1478 * in a thread and this function will return after the thread has been
1479 * asked to call the callback. when called with LDLM_SYNC the blocking
1480 * callback will be performed in this function. */
1481 int ldlm_cancel_lru(struct ldlm_namespace *ns, int nr, ldlm_sync_t sync,
1484 CFS_LIST_HEAD(cancels);
1489 sync = LDLM_SYNC; /* force to be sync in user space */
1491 count = ldlm_cancel_lru_local(ns, &cancels, nr, 0, 0, flags);
1492 if (sync == LDLM_ASYNC) {
1493 rc = ldlm_bl_to_thread_list(ns, NULL, &cancels, count);
1498 /* If an error occured in ASYNC mode, or
1499 * this is SYNC mode, cancel the list. */
1500 ldlm_cli_cancel_list(&cancels, count, NULL, 0);
1504 /* Find and cancel locally unused locks found on resource, matched to the
1505 * given policy, mode. GET the found locks and add them into the @cancels
1507 int ldlm_cancel_resource_local(struct ldlm_resource *res,
1508 struct list_head *cancels,
1509 ldlm_policy_data_t *policy,
1510 ldlm_mode_t mode, int lock_flags,
1511 int cancel_flags, void *opaque)
1513 struct ldlm_lock *lock;
1518 list_for_each_entry(lock, &res->lr_granted, l_res_link) {
1519 if (opaque != NULL && lock->l_ast_data != opaque) {
1520 LDLM_ERROR(lock, "data %p doesn't match opaque %p",
1521 lock->l_ast_data, opaque);
1526 if (lock->l_readers || lock->l_writers) {
1527 if (cancel_flags & LDLM_FL_WARN) {
1528 LDLM_ERROR(lock, "lock in use");
1534 /* If somebody is already doing CANCEL, or blocking ast came,
1535 * skip this lock. */
1536 if (lock->l_flags & LDLM_FL_BL_AST ||
1537 lock->l_flags & LDLM_FL_CANCELING)
1540 if (lockmode_compat(lock->l_granted_mode, mode))
1543 /* If policy is given and this is IBITS lock, add to list only
1544 * those locks that match by policy. */
1545 if (policy && (lock->l_resource->lr_type == LDLM_IBITS) &&
1546 !(lock->l_policy_data.l_inodebits.bits &
1547 policy->l_inodebits.bits))
1550 /* See CBPENDING comment in ldlm_cancel_lru */
1551 lock->l_flags |= LDLM_FL_CBPENDING | LDLM_FL_CANCELING |
1554 LASSERT(list_empty(&lock->l_bl_ast));
1555 list_add(&lock->l_bl_ast, cancels);
1556 LDLM_LOCK_GET(lock);
1561 RETURN(ldlm_cancel_list(cancels, count, cancel_flags));
1564 /* If @req is NULL, send CANCEL request to server with handles of locks
1565 * in the @cancels. If EARLY_CANCEL is not supported, send CANCEL requests
1566 * separately per lock.
1567 * If @req is not NULL, put handles of locks in @cancels into the request
1568 * buffer at the offset @off.
1569 * Destroy @cancels at the end. */
1570 int ldlm_cli_cancel_list(struct list_head *cancels, int count,
1571 struct ptlrpc_request *req, int flags)
1573 struct ldlm_lock *lock;
1577 if (list_empty(cancels) || count == 0)
1580 /* XXX: requests (both batched and not) could be sent in parallel.
1581 * Usually it is enough to have just 1 RPC, but it is possible that
1582 * there are to many locks to be cancelled in LRU or on a resource.
1583 * It would also speed up the case when the server does not support
1586 LASSERT(!list_empty(cancels));
1587 lock = list_entry(cancels->next, struct ldlm_lock, l_bl_ast);
1588 LASSERT(lock->l_conn_export);
1590 if (exp_connect_cancelset(lock->l_conn_export)) {
1593 ldlm_cancel_pack(req, cancels, count);
1595 res = ldlm_cli_cancel_req(lock->l_conn_export,
1599 res = ldlm_cli_cancel_req(lock->l_conn_export,
1604 CERROR("ldlm_cli_cancel_list: %d\n", res);
1609 ldlm_lock_list_put(cancels, l_bl_ast, res);
1611 LASSERT(count == 0);
1615 int ldlm_cli_cancel_unused_resource(struct ldlm_namespace *ns,
1616 const struct ldlm_res_id *res_id,
1617 ldlm_policy_data_t *policy,
1618 ldlm_mode_t mode, int flags, void *opaque)
1620 struct ldlm_resource *res;
1621 CFS_LIST_HEAD(cancels);
1626 res = ldlm_resource_get(ns, NULL, res_id, 0, 0);
1628 /* This is not a problem. */
1629 CDEBUG(D_INFO, "No resource "LPU64"\n", res_id->name[0]);
1633 count = ldlm_cancel_resource_local(res, &cancels, policy, mode,
1635 rc = ldlm_cli_cancel_list(&cancels, count, NULL, flags);
1637 CERROR("ldlm_cli_cancel_unused_resource: %d\n", rc);
1639 ldlm_resource_putref(res);
1643 static inline int have_no_nsresource(struct ldlm_namespace *ns)
1645 int no_resource = 0;
1647 spin_lock(&ns->ns_hash_lock);
1648 if (ns->ns_resources == 0)
1650 spin_unlock(&ns->ns_hash_lock);
1652 RETURN(no_resource);
1655 /* Cancel all locks on a namespace (or a specific resource, if given)
1656 * that have 0 readers/writers.
1658 * If flags & LDLM_FL_LOCAL_ONLY, throw the locks away without trying
1659 * to notify the server. */
1660 int ldlm_cli_cancel_unused(struct ldlm_namespace *ns,
1661 const struct ldlm_res_id *res_id,
1662 int flags, void *opaque)
1671 RETURN(ldlm_cli_cancel_unused_resource(ns, res_id, NULL,
1675 spin_lock(&ns->ns_hash_lock);
1676 for (i = 0; i < RES_HASH_SIZE; i++) {
1677 struct list_head *tmp;
1678 tmp = ns->ns_hash[i].next;
1679 while (tmp != &(ns->ns_hash[i])) {
1680 struct ldlm_resource *res;
1683 res = list_entry(tmp, struct ldlm_resource, lr_hash);
1684 ldlm_resource_getref(res);
1685 spin_unlock(&ns->ns_hash_lock);
1687 rc = ldlm_cli_cancel_unused_resource(ns, &res->lr_name,
1692 CERROR("ldlm_cli_cancel_unused ("LPU64"): %d\n",
1693 res->lr_name.name[0], rc);
1695 spin_lock(&ns->ns_hash_lock);
1697 ldlm_resource_putref_locked(res);
1700 spin_unlock(&ns->ns_hash_lock);
1705 /* join/split resource locks to/from lru list */
1706 int ldlm_cli_join_lru(struct ldlm_namespace *ns,
1707 const struct ldlm_res_id *res_id, int join)
1709 struct ldlm_resource *res;
1710 struct ldlm_lock *lock, *n;
1714 LASSERT(ns_is_client(ns));
1716 res = ldlm_resource_get(ns, NULL, res_id, LDLM_EXTENT, 0);
1719 LASSERT(res->lr_type == LDLM_EXTENT);
1725 list_for_each_entry_safe (lock, n, &res->lr_granted, l_res_link) {
1726 if (list_empty(&lock->l_lru) &&
1727 !lock->l_readers && !lock->l_writers &&
1728 !(lock->l_flags & LDLM_FL_LOCAL) &&
1729 !(lock->l_flags & LDLM_FL_CBPENDING) &&
1730 !(lock->l_flags & LDLM_FL_BL_AST)) {
1731 ldlm_lock_add_to_lru(lock);
1732 lock->l_flags &= ~LDLM_FL_NO_LRU;
1733 LDLM_DEBUG(lock, "join lock to lru");
1739 spin_lock(&ns->ns_unused_lock);
1740 list_for_each_entry_safe (lock, n, &ns->ns_unused_list, l_lru) {
1741 if (lock->l_resource == res) {
1742 ldlm_lock_remove_from_lru_nolock(lock);
1743 lock->l_flags |= LDLM_FL_NO_LRU;
1744 LDLM_DEBUG(lock, "split lock from lru");
1748 spin_unlock(&ns->ns_unused_lock);
1751 ldlm_resource_putref(res);
1755 /* Lock iterators. */
1757 int ldlm_resource_foreach(struct ldlm_resource *res, ldlm_iterator_t iter,
1760 struct list_head *tmp, *next;
1761 struct ldlm_lock *lock;
1762 int rc = LDLM_ITER_CONTINUE;
1767 RETURN(LDLM_ITER_CONTINUE);
1770 list_for_each_safe(tmp, next, &res->lr_granted) {
1771 lock = list_entry(tmp, struct ldlm_lock, l_res_link);
1773 if (iter(lock, closure) == LDLM_ITER_STOP)
1774 GOTO(out, rc = LDLM_ITER_STOP);
1777 list_for_each_safe(tmp, next, &res->lr_converting) {
1778 lock = list_entry(tmp, struct ldlm_lock, l_res_link);
1780 if (iter(lock, closure) == LDLM_ITER_STOP)
1781 GOTO(out, rc = LDLM_ITER_STOP);
1784 list_for_each_safe(tmp, next, &res->lr_waiting) {
1785 lock = list_entry(tmp, struct ldlm_lock, l_res_link);
1787 if (iter(lock, closure) == LDLM_ITER_STOP)
1788 GOTO(out, rc = LDLM_ITER_STOP);
1795 struct iter_helper_data {
1796 ldlm_iterator_t iter;
1800 static int ldlm_iter_helper(struct ldlm_lock *lock, void *closure)
1802 struct iter_helper_data *helper = closure;
1803 return helper->iter(lock, helper->closure);
1806 static int ldlm_res_iter_helper(struct ldlm_resource *res, void *closure)
1808 return ldlm_resource_foreach(res, ldlm_iter_helper, closure);
1811 int ldlm_namespace_foreach(struct ldlm_namespace *ns, ldlm_iterator_t iter,
1814 struct iter_helper_data helper = { iter: iter, closure: closure };
1815 return ldlm_namespace_foreach_res(ns, ldlm_res_iter_helper, &helper);
1818 int ldlm_namespace_foreach_res(struct ldlm_namespace *ns,
1819 ldlm_res_iterator_t iter, void *closure)
1821 int i, rc = LDLM_ITER_CONTINUE;
1822 struct ldlm_resource *res;
1823 struct list_head *tmp;
1826 spin_lock(&ns->ns_hash_lock);
1827 for (i = 0; i < RES_HASH_SIZE; i++) {
1828 tmp = ns->ns_hash[i].next;
1829 while (tmp != &(ns->ns_hash[i])) {
1830 res = list_entry(tmp, struct ldlm_resource, lr_hash);
1831 ldlm_resource_getref(res);
1832 spin_unlock(&ns->ns_hash_lock);
1834 rc = iter(res, closure);
1836 spin_lock(&ns->ns_hash_lock);
1838 ldlm_resource_putref_locked(res);
1839 if (rc == LDLM_ITER_STOP)
1844 spin_unlock(&ns->ns_hash_lock);
1848 /* non-blocking function to manipulate a lock whose cb_data is being put away.*/
1849 void ldlm_resource_iterate(struct ldlm_namespace *ns,
1850 const struct ldlm_res_id *res_id,
1851 ldlm_iterator_t iter, void *data)
1853 struct ldlm_resource *res;
1857 CERROR("must pass in namespace\n");
1861 res = ldlm_resource_get(ns, NULL, res_id, 0, 0);
1867 ldlm_resource_foreach(res, iter, data);
1868 ldlm_resource_putref(res);
1874 static int ldlm_chain_lock_for_replay(struct ldlm_lock *lock, void *closure)
1876 struct list_head *list = closure;
1878 /* we use l_pending_chain here, because it's unused on clients. */
1879 LASSERTF(list_empty(&lock->l_pending_chain),"lock %p next %p prev %p\n",
1880 lock, &lock->l_pending_chain.next,&lock->l_pending_chain.prev);
1881 /* bug 9573: don't replay locks left after eviction */
1882 if (!(lock->l_flags & LDLM_FL_FAILED))
1883 list_add(&lock->l_pending_chain, list);
1884 return LDLM_ITER_CONTINUE;
1887 static int replay_lock_interpret(struct ptlrpc_request *req,
1888 struct ldlm_async_args *aa, int rc)
1890 struct ldlm_lock *lock;
1891 struct ldlm_reply *reply;
1894 atomic_dec(&req->rq_import->imp_replay_inflight);
1899 reply = req_capsule_server_get(&req->rq_pill, &RMF_DLM_REP);
1901 GOTO(out, rc = -EPROTO);
1903 lock = ldlm_handle2lock(&aa->lock_handle);
1905 CERROR("received replay ack for unknown local cookie "LPX64
1906 " remote cookie "LPX64 " from server %s id %s\n",
1907 aa->lock_handle.cookie, reply->lock_handle.cookie,
1908 req->rq_export->exp_client_uuid.uuid,
1909 libcfs_id2str(req->rq_peer));
1910 GOTO(out, rc = -ESTALE);
1913 lock->l_remote_handle = reply->lock_handle;
1914 LDLM_DEBUG(lock, "replayed lock:");
1915 ptlrpc_import_recovery_state_machine(req->rq_import);
1916 LDLM_LOCK_PUT(lock);
1919 ptlrpc_connect_import(req->rq_import, NULL);
1925 static int replay_one_lock(struct obd_import *imp, struct ldlm_lock *lock)
1927 struct ptlrpc_request *req;
1928 struct ldlm_async_args *aa;
1929 struct ldlm_request *body;
1934 /* Bug 11974: Do not replay a lock which is actively being canceled */
1935 if (lock->l_flags & LDLM_FL_CANCELING) {
1936 LDLM_DEBUG(lock, "Not replaying canceled lock:");
1940 /* If this is reply-less callback lock, we cannot replay it, since
1941 * server might have long dropped it, but notification of that event was
1942 * lost by network. (and server granted conflicting lock already) */
1943 if (lock->l_flags & LDLM_FL_CANCEL_ON_BLOCK) {
1944 LDLM_DEBUG(lock, "Not replaying reply-less lock:");
1945 ldlm_lock_cancel(lock);
1949 * If granted mode matches the requested mode, this lock is granted.
1951 * If they differ, but we have a granted mode, then we were granted
1952 * one mode and now want another: ergo, converting.
1954 * If we haven't been granted anything and are on a resource list,
1955 * then we're blocked/waiting.
1957 * If we haven't been granted anything and we're NOT on a resource list,
1958 * then we haven't got a reply yet and don't have a known disposition.
1959 * This happens whenever a lock enqueue is the request that triggers
1962 if (lock->l_granted_mode == lock->l_req_mode)
1963 flags = LDLM_FL_REPLAY | LDLM_FL_BLOCK_GRANTED;
1964 else if (lock->l_granted_mode)
1965 flags = LDLM_FL_REPLAY | LDLM_FL_BLOCK_CONV;
1966 else if (!list_empty(&lock->l_res_link))
1967 flags = LDLM_FL_REPLAY | LDLM_FL_BLOCK_WAIT;
1969 flags = LDLM_FL_REPLAY;
1971 req = ptlrpc_request_alloc_pack(imp, &RQF_LDLM_ENQUEUE,
1972 LUSTRE_DLM_VERSION, LDLM_ENQUEUE);
1976 /* We're part of recovery, so don't wait for it. */
1977 req->rq_send_state = LUSTRE_IMP_REPLAY_LOCKS;
1979 body = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
1980 ldlm_lock2desc(lock, &body->lock_desc);
1981 body->lock_flags = flags;
1983 ldlm_lock2handle(lock, &body->lock_handle[0]);
1984 if (lock->l_lvb_len != 0) {
1985 req_capsule_extend(&req->rq_pill, &RQF_LDLM_ENQUEUE_LVB);
1986 req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB, RCL_SERVER,
1989 ptlrpc_request_set_replen(req);
1990 /* notify the server we've replayed all requests.
1991 * also, we mark the request to be put on a dedicated
1992 * queue to be processed after all request replayes.
1994 lustre_msg_set_flags(req->rq_reqmsg, MSG_REQ_REPLAY_DONE);
1996 LDLM_DEBUG(lock, "replaying lock:");
1998 atomic_inc(&req->rq_import->imp_replay_inflight);
1999 CLASSERT(sizeof(*aa) <= sizeof(req->rq_async_args));
2000 aa = (struct ldlm_async_args *)&req->rq_async_args;
2001 aa->lock_handle = body->lock_handle[0];
2002 req->rq_interpret_reply = replay_lock_interpret;
2003 ptlrpcd_add_req(req);
2008 int ldlm_replay_locks(struct obd_import *imp)
2010 struct ldlm_namespace *ns = imp->imp_obd->obd_namespace;
2011 CFS_LIST_HEAD(list);
2012 struct ldlm_lock *lock, *next;
2017 LASSERT(atomic_read(&imp->imp_replay_inflight) == 0);
2019 /* ensure this doesn't fall to 0 before all have been queued */
2020 atomic_inc(&imp->imp_replay_inflight);
2022 (void)ldlm_namespace_foreach(ns, ldlm_chain_lock_for_replay, &list);
2024 list_for_each_entry_safe(lock, next, &list, l_pending_chain) {
2025 list_del_init(&lock->l_pending_chain);
2027 continue; /* or try to do the rest? */
2028 rc = replay_one_lock(imp, lock);
2031 atomic_dec(&imp->imp_replay_inflight);