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 int ldlm_completion_ast(struct ldlm_lock *lock, int flags, void *data)
92 /* XXX ALLOCATE - 160 bytes */
93 struct lock_wait_data lwd;
94 struct obd_device *obd;
95 struct obd_import *imp = NULL;
96 struct l_wait_info lwi;
100 if (flags == LDLM_FL_WAIT_NOREPROC) {
101 LDLM_DEBUG(lock, "client-side enqueue waiting on pending lock");
105 if (!(flags & (LDLM_FL_BLOCK_WAIT | LDLM_FL_BLOCK_GRANTED |
106 LDLM_FL_BLOCK_CONV))) {
107 cfs_waitq_signal(&lock->l_waitq);
111 LDLM_DEBUG(lock, "client-side enqueue returned a blocked lock, "
113 ldlm_lock_dump(D_OTHER, lock, 0);
114 ldlm_reprocess_all(lock->l_resource);
118 obd = class_exp2obd(lock->l_conn_export);
120 /* if this is a local lock, then there is no import */
122 imp = obd->u.cli.cl_import;
126 if (lock->l_flags & LDLM_FL_NO_TIMEOUT) {
127 LDLM_DEBUG(lock, "waiting indefinitely because of NO_TIMEOUT");
128 lwi = LWI_INTR(interrupted_completion_wait, &lwd);
130 lwi = LWI_TIMEOUT_INTR(cfs_time_seconds(obd_timeout),
131 ldlm_expired_completion_wait,
132 interrupted_completion_wait, &lwd);
136 spin_lock(&imp->imp_lock);
137 lwd.lwd_conn_cnt = imp->imp_conn_cnt;
138 spin_unlock(&imp->imp_lock);
141 /* Go to sleep until the lock is granted or cancelled. */
142 rc = l_wait_event(lock->l_waitq,
143 ((lock->l_req_mode == lock->l_granted_mode) ||
144 (lock->l_flags & LDLM_FL_FAILED)), &lwi);
146 if (lock->l_destroyed || lock->l_flags & LDLM_FL_FAILED) {
147 LDLM_DEBUG(lock, "client-side enqueue waking up: destroyed");
152 LDLM_DEBUG(lock, "client-side enqueue waking up: failed (%d)",
157 LDLM_DEBUG(lock, "client-side enqueue waking up: granted");
162 * ->l_blocking_ast() callback for LDLM locks acquired by server-side OBDs.
164 int ldlm_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
165 void *data, int flag)
170 if (flag == LDLM_CB_CANCELING) {
171 /* Don't need to do anything here. */
175 lock_res_and_lock(lock);
176 /* Get this: if ldlm_blocking_ast is racing with intent_policy, such
177 * that ldlm_blocking_ast is called just before intent_policy method
178 * takes the ns_lock, then by the time we get the lock, we might not
179 * be the correct blocking function anymore. So check, and return
181 if (lock->l_blocking_ast != ldlm_blocking_ast) {
182 unlock_res_and_lock(lock);
186 lock->l_flags |= LDLM_FL_CBPENDING;
187 do_ast = (!lock->l_readers && !lock->l_writers);
188 unlock_res_and_lock(lock);
191 struct lustre_handle lockh;
194 LDLM_DEBUG(lock, "already unused, calling ldlm_cli_cancel");
195 ldlm_lock2handle(lock, &lockh);
196 rc = ldlm_cli_cancel(&lockh);
198 CERROR("ldlm_cli_cancel: %d\n", rc);
200 LDLM_DEBUG(lock, "Lock still has references, will be "
207 * ->l_glimpse_ast() for DLM extent locks acquired on the server-side. See
208 * comment in filter_intent_policy() on why you may need this.
210 int ldlm_glimpse_ast(struct ldlm_lock *lock, void *reqp)
213 * Returning -ELDLM_NO_LOCK_DATA actually works, but the reason for
214 * that is rather subtle: with OST-side locking, it may so happen that
215 * _all_ extent locks are held by the OST. If client wants to obtain
216 * current file size it calls ll{,u}_glimpse_size(), and (as locks are
217 * on the server), dummy glimpse callback fires and does
218 * nothing. Client still receives correct file size due to the
219 * following fragment in filter_intent_policy():
221 * rc = l->l_glimpse_ast(l, NULL); // this will update the LVB
222 * if (rc != 0 && res->lr_namespace->ns_lvbo &&
223 * res->lr_namespace->ns_lvbo->lvbo_update) {
224 * res->lr_namespace->ns_lvbo->lvbo_update(res, NULL, 0, 1);
227 * that is, after glimpse_ast() fails, filter_lvbo_update() runs, and
228 * returns correct file size to the client.
230 return -ELDLM_NO_LOCK_DATA;
233 int ldlm_cli_enqueue_local(struct ldlm_namespace *ns,
234 const struct ldlm_res_id *res_id,
235 ldlm_type_t type, ldlm_policy_data_t *policy,
236 ldlm_mode_t mode, int *flags,
237 ldlm_blocking_callback blocking,
238 ldlm_completion_callback completion,
239 ldlm_glimpse_callback glimpse,
240 void *data, __u32 lvb_len, void *lvb_swabber,
241 struct lustre_handle *lockh)
243 struct ldlm_lock *lock;
247 LASSERT(!(*flags & LDLM_FL_REPLAY));
248 if (unlikely(ns_is_client(ns))) {
249 CERROR("Trying to enqueue local lock in a shadow namespace\n");
253 lock = ldlm_lock_create(ns, res_id, type, mode, blocking,
254 completion, glimpse, data, lvb_len);
256 GOTO(out_nolock, err = -ENOMEM);
257 LDLM_DEBUG(lock, "client-side local enqueue handler, new lock created");
259 ldlm_lock_addref_internal(lock, mode);
260 ldlm_lock2handle(lock, lockh);
261 lock_res_and_lock(lock);
262 lock->l_flags |= LDLM_FL_LOCAL;
263 if (*flags & LDLM_FL_ATOMIC_CB)
264 lock->l_flags |= LDLM_FL_ATOMIC_CB;
265 lock->l_lvb_swabber = lvb_swabber;
266 unlock_res_and_lock(lock);
268 lock->l_policy_data = *policy;
269 if (type == LDLM_EXTENT)
270 lock->l_req_extent = policy->l_extent;
272 err = ldlm_lock_enqueue(ns, &lock, policy, flags);
273 if (unlikely(err != ELDLM_OK))
277 *policy = lock->l_policy_data;
279 LDLM_DEBUG_NOLOCK("client-side local enqueue handler END (lock %p)",
282 if (lock->l_completion_ast)
283 lock->l_completion_ast(lock, *flags, NULL);
285 LDLM_DEBUG(lock, "client-side local enqueue END");
293 static void failed_lock_cleanup(struct ldlm_namespace *ns,
294 struct ldlm_lock *lock,
295 struct lustre_handle *lockh, int mode)
297 /* Set a flag to prevent us from sending a CANCEL (bug 407) */
298 lock_res_and_lock(lock);
299 lock->l_flags |= LDLM_FL_LOCAL_ONLY;
300 unlock_res_and_lock(lock);
301 LDLM_DEBUG(lock, "setting FL_LOCAL_ONLY");
303 ldlm_lock_decref_and_cancel(lockh, mode);
305 /* XXX - HACK because we shouldn't call ldlm_lock_destroy()
306 * from llite/file.c/ll_file_flock(). */
307 if (lock->l_resource->lr_type == LDLM_FLOCK) {
308 ldlm_lock_destroy(lock);
312 int ldlm_cli_enqueue_fini(struct obd_export *exp, struct ptlrpc_request *req,
313 ldlm_type_t type, __u8 with_policy, ldlm_mode_t mode,
314 int *flags, void *lvb, __u32 lvb_len,
315 void *lvb_swabber, struct lustre_handle *lockh,int rc)
317 struct ldlm_namespace *ns = exp->exp_obd->obd_namespace;
318 int is_replay = *flags & LDLM_FL_REPLAY;
319 struct ldlm_lock *lock;
320 struct ldlm_reply *reply;
321 int cleanup_phase = 1;
324 lock = ldlm_handle2lock(lockh);
325 /* ldlm_cli_enqueue is holding a reference on this lock. */
327 LASSERT(type == LDLM_FLOCK);
331 if (rc != ELDLM_OK) {
333 LDLM_DEBUG(lock, "client-side enqueue END (%s)",
334 rc == ELDLM_LOCK_ABORTED ? "ABORTED" : "FAILED");
335 if (rc == ELDLM_LOCK_ABORTED) {
336 /* Before we return, swab the reply */
337 reply = lustre_swab_repbuf(req, DLM_LOCKREPLY_OFF,
339 lustre_swab_ldlm_reply);
341 CERROR("Can't unpack ldlm_reply\n");
346 tmplvb = lustre_swab_repbuf(req,
351 GOTO(cleanup, rc = -EPROTO);
353 memcpy(lvb, tmplvb, lvb_len);
359 reply = lustre_swab_repbuf(req, DLM_LOCKREPLY_OFF, sizeof(*reply),
360 lustre_swab_ldlm_reply);
362 CERROR("Can't unpack ldlm_reply\n");
363 GOTO(cleanup, rc = -EPROTO);
366 /* lock enqueued on the server */
369 lock_res_and_lock(lock);
370 lock->l_remote_handle = reply->lock_handle;
371 *flags = reply->lock_flags;
372 lock->l_flags |= reply->lock_flags & LDLM_INHERIT_FLAGS;
373 /* move NO_TIMEOUT flag to the lock to force ldlm_lock_match()
374 * to wait with no timeout as well */
375 lock->l_flags |= reply->lock_flags & LDLM_FL_NO_TIMEOUT;
376 unlock_res_and_lock(lock);
378 CDEBUG(D_INFO, "local: %p, remote cookie: "LPX64", flags: 0x%x\n",
379 lock, reply->lock_handle.cookie, *flags);
381 /* If enqueue returned a blocked lock but the completion handler has
382 * already run, then it fixed up the resource and we don't need to do it
384 if ((*flags) & LDLM_FL_LOCK_CHANGED) {
385 int newmode = reply->lock_desc.l_req_mode;
387 if (newmode && newmode != lock->l_req_mode) {
388 LDLM_DEBUG(lock, "server returned different mode %s",
389 ldlm_lockname[newmode]);
390 lock->l_req_mode = newmode;
393 if (memcmp(reply->lock_desc.l_resource.lr_name.name,
394 lock->l_resource->lr_name.name,
395 sizeof(struct ldlm_res_id))) {
396 CDEBUG(D_INFO, "remote intent success, locking "
397 "(%ld,%ld,%ld) instead of "
399 (long)reply->lock_desc.l_resource.lr_name.name[0],
400 (long)reply->lock_desc.l_resource.lr_name.name[1],
401 (long)reply->lock_desc.l_resource.lr_name.name[2],
402 (long)lock->l_resource->lr_name.name[0],
403 (long)lock->l_resource->lr_name.name[1],
404 (long)lock->l_resource->lr_name.name[2]);
406 ldlm_lock_change_resource(ns, lock,
407 &reply->lock_desc.l_resource.lr_name);
408 if (lock->l_resource == NULL) {
410 GOTO(cleanup, rc = -ENOMEM);
412 LDLM_DEBUG(lock, "client-side enqueue, new resource");
415 if (!(type == LDLM_IBITS && !(exp->exp_connect_flags &
417 lock->l_policy_data =
418 reply->lock_desc.l_policy_data;
419 if (type != LDLM_PLAIN)
420 LDLM_DEBUG(lock,"client-side enqueue, new policy data");
423 if ((*flags) & LDLM_FL_AST_SENT ||
424 /* Cancel extent locks as soon as possible on a liblustre client,
425 * because it cannot handle asynchronous ASTs robustly (see
427 (LIBLUSTRE_CLIENT && type == LDLM_EXTENT)) {
428 lock_res_and_lock(lock);
429 lock->l_flags |= LDLM_FL_CBPENDING | LDLM_FL_BL_AST;
430 unlock_res_and_lock(lock);
431 LDLM_DEBUG(lock, "enqueue reply includes blocking AST");
434 /* If the lock has already been granted by a completion AST, don't
435 * clobber the LVB with an older one. */
436 if (lvb_len && (lock->l_req_mode != lock->l_granted_mode)) {
438 tmplvb = lustre_swab_repbuf(req, DLM_REPLY_REC_OFF, lvb_len,
441 GOTO(cleanup, rc = -EPROTO);
442 memcpy(lock->l_lvb_data, tmplvb, lvb_len);
446 rc = ldlm_lock_enqueue(ns, &lock, NULL, flags);
447 if (lock->l_completion_ast != NULL) {
448 int err = lock->l_completion_ast(lock, *flags, NULL);
451 if (rc && type != LDLM_FLOCK) /* bug 9425, bug 10250 */
456 if (lvb_len && lvb != NULL) {
457 /* Copy the LVB here, and not earlier, because the completion
458 * AST (if any) can override what we got in the reply */
459 memcpy(lvb, lock->l_lvb_data, lvb_len);
462 LDLM_DEBUG(lock, "client-side enqueue END");
465 if (cleanup_phase == 1 && rc)
466 failed_lock_cleanup(ns, lock, lockh, mode);
467 /* Put lock 2 times, the second reference is held by ldlm_cli_enqueue */
473 /* PAGE_SIZE-512 is to allow TCP/IP and LNET headers to fit into
474 * a single page on the send/receive side. XXX: 512 should be changed
475 * to more adequate value. */
476 static inline int ldlm_req_handles_avail(struct obd_export *exp,
477 int *size, int bufcount, int off)
479 int avail = min_t(int, LDLM_MAXREQSIZE, PAGE_SIZE - 512);
480 int old_size = size[DLM_LOCKREQ_OFF];
482 size[DLM_LOCKREQ_OFF] = sizeof(struct ldlm_request);
483 avail -= lustre_msg_size(class_exp2cliimp(exp)->imp_msg_magic,
485 avail /= sizeof(struct lustre_handle);
486 avail += LDLM_LOCKREQ_HANDLES - off;
487 size[DLM_LOCKREQ_OFF] = old_size;
492 static inline int ldlm_cancel_handles_avail(struct obd_export *exp)
494 int size[2] = { sizeof(struct ptlrpc_body),
495 sizeof(struct ldlm_request) };
496 return ldlm_req_handles_avail(exp, size, 2, 0);
499 /* Cancel lru locks and pack them into the enqueue request. Pack there the given
500 * @count locks in @cancels. */
501 struct ptlrpc_request *ldlm_prep_enqueue_req(struct obd_export *exp,
502 int bufcount, int *size,
503 struct list_head *cancels,
506 struct ldlm_namespace *ns = exp->exp_obd->obd_namespace;
507 struct ldlm_request *dlm = NULL;
508 struct ptlrpc_request *req;
514 if (exp_connect_cancelset(exp)) {
515 /* Estimate the amount of available space in the request. */
516 int avail = ldlm_req_handles_avail(exp, size, bufcount,
517 LDLM_ENQUEUE_CANCEL_OFF);
520 LASSERT(avail >= count);
522 flags = ns_connect_lru_resize(ns) ?
523 LDLM_CANCEL_LRUR : LDLM_CANCEL_AGED;
524 cancel = ns_connect_lru_resize(ns) ? 0 : 1;
526 /* Cancel lru locks here _only_ if the server supports
527 * EARLY_CANCEL. Otherwise we have to send extra CANCEL
528 * rpc right on enqueue, what will make it slower, vs.
529 * asynchronous rpc in blocking thread. */
530 count += ldlm_cancel_lru_local(ns, cancels, cancel,
531 avail - count, flags);
532 size[DLM_LOCKREQ_OFF] =
533 ldlm_request_bufsize(count, LDLM_ENQUEUE);
535 req = ptlrpc_prep_req(class_exp2cliimp(exp), LUSTRE_DLM_VERSION,
536 LDLM_ENQUEUE, bufcount, size, NULL);
537 if (exp_connect_cancelset(exp) && req) {
538 dlm = lustre_msg_buf(req->rq_reqmsg,
539 DLM_LOCKREQ_OFF, sizeof(*dlm));
540 /* Skip first lock handler in ldlm_request_pack(), this method
541 * will incrment @lock_count according to the lock handle amount
542 * actually written to the buffer. */
543 dlm->lock_count = LDLM_ENQUEUE_CANCEL_OFF;
544 ldlm_cli_cancel_list(cancels, count, req, DLM_LOCKREQ_OFF, 0);
546 ldlm_lock_list_put(cancels, l_bl_ast, count);
551 /* If a request has some specific initialisation it is passed in @reqp,
552 * otherwise it is created in ldlm_cli_enqueue.
554 * Supports sync and async requests, pass @async flag accordingly. If a
555 * request was created in ldlm_cli_enqueue and it is the async request,
556 * pass it to the caller in @reqp. */
557 int ldlm_cli_enqueue(struct obd_export *exp, struct ptlrpc_request **reqp,
558 struct ldlm_enqueue_info *einfo,
559 const struct ldlm_res_id *res_id,
560 ldlm_policy_data_t *policy, int *flags,
561 void *lvb, __u32 lvb_len, void *lvb_swabber,
562 struct lustre_handle *lockh, int async)
564 struct ldlm_namespace *ns = exp->exp_obd->obd_namespace;
565 struct ldlm_lock *lock;
566 struct ldlm_request *body;
567 struct ldlm_reply *reply;
568 int size[3] = { [MSG_PTLRPC_BODY_OFF] = sizeof(struct ptlrpc_body),
569 [DLM_LOCKREQ_OFF] = sizeof(*body),
570 [DLM_REPLY_REC_OFF] = lvb_len };
571 int is_replay = *flags & LDLM_FL_REPLAY;
572 int req_passed_in = 1, rc, err;
573 struct ptlrpc_request *req;
576 LASSERT(exp != NULL);
578 /* If we're replaying this lock, just check some invariants.
579 * If we're creating a new lock, get everything all setup nice. */
581 lock = ldlm_handle2lock(lockh);
582 LASSERT(lock != NULL);
583 LDLM_DEBUG(lock, "client-side enqueue START");
584 LASSERT(exp == lock->l_conn_export);
586 lock = ldlm_lock_create(ns, res_id, einfo->ei_type,
587 einfo->ei_mode, einfo->ei_cb_bl,
588 einfo->ei_cb_cp, einfo->ei_cb_gl,
589 einfo->ei_cbdata, lvb_len);
592 /* for the local lock, add the reference */
593 ldlm_lock_addref_internal(lock, einfo->ei_mode);
594 ldlm_lock2handle(lock, lockh);
595 lock->l_lvb_swabber = lvb_swabber;
596 if (policy != NULL) {
597 /* INODEBITS_INTEROP: If the server does not support
598 * inodebits, we will request a plain lock in the
599 * descriptor (ldlm_lock2desc() below) but use an
600 * inodebits lock internally with both bits set.
602 if (einfo->ei_type == LDLM_IBITS &&
603 !(exp->exp_connect_flags & OBD_CONNECT_IBITS))
604 lock->l_policy_data.l_inodebits.bits =
605 MDS_INODELOCK_LOOKUP |
606 MDS_INODELOCK_UPDATE;
608 lock->l_policy_data = *policy;
611 if (einfo->ei_type == LDLM_EXTENT)
612 lock->l_req_extent = policy->l_extent;
613 LDLM_DEBUG(lock, "client-side enqueue START");
616 /* lock not sent to server yet */
618 if (reqp == NULL || *reqp == NULL) {
619 req = ldlm_prep_enqueue_req(exp, 2, size, NULL, 0);
621 failed_lock_cleanup(ns, lock, lockh, einfo->ei_mode);
630 LASSERTF(lustre_msg_buflen(req->rq_reqmsg, DLM_LOCKREQ_OFF) >=
631 sizeof(*body), "buflen[%d] = %d, not "LPSZ"\n",
633 lustre_msg_buflen(req->rq_reqmsg, DLM_LOCKREQ_OFF),
637 lock->l_conn_export = exp;
638 lock->l_export = NULL;
639 lock->l_blocking_ast = einfo->ei_cb_bl;
641 /* Dump lock data into the request buffer */
642 body = lustre_msg_buf(req->rq_reqmsg, DLM_LOCKREQ_OFF, sizeof(*body));
643 ldlm_lock2desc(lock, &body->lock_desc);
644 body->lock_flags = *flags;
645 body->lock_handle[0] = *lockh;
647 /* Continue as normal. */
648 if (!req_passed_in) {
649 size[DLM_LOCKREPLY_OFF] = sizeof(*reply);
650 ptlrpc_req_set_repsize(req, 2 + (lvb_len > 0), size);
654 * Liblustre client doesn't get extent locks, except for O_APPEND case
655 * where [0, OBD_OBJECT_EOF] lock is taken, or truncate, where
656 * [i_size, OBD_OBJECT_EOF] lock is taken.
658 LASSERT(ergo(LIBLUSTRE_CLIENT, einfo->ei_type != LDLM_EXTENT ||
659 policy->l_extent.end == OBD_OBJECT_EOF));
662 LASSERT(reqp != NULL);
666 LDLM_DEBUG(lock, "sending request");
667 rc = ptlrpc_queue_wait(req);
668 err = ldlm_cli_enqueue_fini(exp, req, einfo->ei_type, policy ? 1 : 0,
669 einfo->ei_mode, flags, lvb, lvb_len,
670 lvb_swabber, lockh, rc);
672 /* If ldlm_cli_enqueue_fini did not find the lock, we need to free
673 * one reference that we took */
679 if (!req_passed_in && req != NULL) {
680 ptlrpc_req_finished(req);
688 static int ldlm_cli_convert_local(struct ldlm_lock *lock, int new_mode,
691 struct ldlm_resource *res;
694 if (ns_is_client(lock->l_resource->lr_namespace)) {
695 CERROR("Trying to cancel local lock\n");
698 LDLM_DEBUG(lock, "client-side local convert");
700 res = ldlm_lock_convert(lock, new_mode, flags);
702 ldlm_reprocess_all(res);
707 LDLM_DEBUG(lock, "client-side local convert handler END");
712 /* FIXME: one of ldlm_cli_convert or the server side should reject attempted
713 * conversion of locks which are on the waiting or converting queue */
714 /* Caller of this code is supposed to take care of lock readers/writers
716 int ldlm_cli_convert(struct lustre_handle *lockh, int new_mode, int *flags)
718 struct ldlm_request *body;
719 struct ldlm_reply *reply;
720 struct ldlm_lock *lock;
721 struct ldlm_resource *res;
722 struct ptlrpc_request *req;
723 int size[2] = { [MSG_PTLRPC_BODY_OFF] = sizeof(struct ptlrpc_body),
724 [DLM_LOCKREQ_OFF] = sizeof(*body) };
728 lock = ldlm_handle2lock(lockh);
735 if (lock->l_conn_export == NULL)
736 RETURN(ldlm_cli_convert_local(lock, new_mode, flags));
738 LDLM_DEBUG(lock, "client-side convert");
740 req = ptlrpc_prep_req(class_exp2cliimp(lock->l_conn_export),
741 LUSTRE_DLM_VERSION, LDLM_CONVERT, 2, size, NULL);
743 GOTO(out, rc = -ENOMEM);
745 body = lustre_msg_buf(req->rq_reqmsg, DLM_LOCKREQ_OFF, sizeof(*body));
746 body->lock_handle[0] = lock->l_remote_handle;
748 body->lock_desc.l_req_mode = new_mode;
749 body->lock_flags = *flags;
751 size[DLM_LOCKREPLY_OFF] = sizeof(*reply);
752 ptlrpc_req_set_repsize(req, 2, size);
754 rc = ptlrpc_queue_wait(req);
758 reply = lustre_swab_repbuf(req, DLM_LOCKREPLY_OFF, sizeof(*reply),
759 lustre_swab_ldlm_reply);
761 CERROR ("Can't unpack ldlm_reply\n");
762 GOTO (out, rc = -EPROTO);
766 GOTO(out, rc = req->rq_status);
768 res = ldlm_lock_convert(lock, new_mode, &reply->lock_flags);
770 ldlm_reprocess_all(res);
771 /* Go to sleep until the lock is granted. */
772 /* FIXME: or cancelled. */
773 if (lock->l_completion_ast) {
774 rc = lock->l_completion_ast(lock, LDLM_FL_WAIT_NOREPROC,
785 ptlrpc_req_finished(req);
789 /* Cancel locks locally.
791 * LDLM_FL_LOCAL_ONLY if tere is no need in a CANCEL rpc to the server;
792 * LDLM_FL_CANCELING otherwise;
793 * LDLM_FL_BL_AST if there is a need in a separate CANCEL rpc. */
794 static int ldlm_cli_cancel_local(struct ldlm_lock *lock)
796 int rc = LDLM_FL_LOCAL_ONLY;
799 if (lock->l_conn_export) {
802 LDLM_DEBUG(lock, "client-side cancel");
803 /* Set this flag to prevent others from getting new references*/
804 lock_res_and_lock(lock);
805 lock->l_flags |= LDLM_FL_CBPENDING;
806 local_only = (lock->l_flags &
807 (LDLM_FL_LOCAL_ONLY|LDLM_FL_CANCEL_ON_BLOCK));
808 ldlm_cancel_callback(lock);
809 rc = (lock->l_flags & LDLM_FL_BL_AST) ?
810 LDLM_FL_BL_AST : LDLM_FL_CANCELING;
811 unlock_res_and_lock(lock);
814 CDEBUG(D_DLMTRACE, "not sending request (at caller's "
816 rc = LDLM_FL_LOCAL_ONLY;
818 ldlm_lock_cancel(lock);
820 if (ns_is_client(lock->l_resource->lr_namespace)) {
821 LDLM_ERROR(lock, "Trying to cancel local lock");
824 LDLM_DEBUG(lock, "server-side local cancel");
825 ldlm_lock_cancel(lock);
826 ldlm_reprocess_all(lock->l_resource);
827 LDLM_DEBUG(lock, "server-side local cancel handler END");
833 /* Pack @count locks in @head into ldlm_request buffer at the offset @off,
834 of the request @req. */
835 static void ldlm_cancel_pack(struct ptlrpc_request *req, int off,
836 struct list_head *head, int count)
838 struct ldlm_request *dlm;
839 struct ldlm_lock *lock;
843 dlm = lustre_msg_buf(req->rq_reqmsg, off, sizeof(*dlm));
844 LASSERT(dlm != NULL);
846 /* Check the room in the request buffer. */
847 max = lustre_msg_buflen(req->rq_reqmsg, off) -
848 sizeof(struct ldlm_request);
849 max /= sizeof(struct lustre_handle);
850 max += LDLM_LOCKREQ_HANDLES;
851 LASSERT(max >= dlm->lock_count + count);
853 /* XXX: it would be better to pack lock handles grouped by resource.
854 * so that the server cancel would call filter_lvbo_update() less
856 list_for_each_entry(lock, head, l_bl_ast) {
859 LASSERT(lock->l_conn_export);
860 /* Pack the lock handle to the given request buffer. */
861 LDLM_DEBUG(lock, "packing");
862 dlm->lock_handle[dlm->lock_count++] = lock->l_remote_handle;
865 CDEBUG(D_DLMTRACE, "%d locks packed\n", packed);
869 /* Prepare and send a batched cancel rpc, it will include count lock handles
870 * of locks given in @head. */
871 int ldlm_cli_cancel_req(struct obd_export *exp, struct list_head *cancels,
872 int count, int flags)
874 struct ptlrpc_request *req = NULL;
875 struct ldlm_request *body;
876 int size[2] = { [MSG_PTLRPC_BODY_OFF] = sizeof(struct ptlrpc_body),
877 [DLM_LOCKREQ_OFF] = sizeof(*body) };
878 struct obd_import *imp;
883 LASSERT(exp != NULL);
886 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_CANCEL_RACE))
889 free = ldlm_req_handles_avail(exp, size, 2, 0);
893 size[DLM_LOCKREQ_OFF] = ldlm_request_bufsize(count, LDLM_CANCEL);
895 imp = class_exp2cliimp(exp);
896 if (imp == NULL || imp->imp_invalid) {
898 "skipping cancel on invalid import %p\n", imp);
902 req = ptlrpc_prep_req(imp, LUSTRE_DLM_VERSION, LDLM_CANCEL, 2,
905 GOTO(out, rc = -ENOMEM);
907 req->rq_no_resend = 1;
908 req->rq_no_delay = 1;
910 /* XXX FIXME bug 249 */
911 req->rq_request_portal = LDLM_CANCEL_REQUEST_PORTAL;
912 req->rq_reply_portal = LDLM_CANCEL_REPLY_PORTAL;
914 body = lustre_msg_buf(req->rq_reqmsg, DLM_LOCKREQ_OFF,
916 ldlm_cancel_pack(req, DLM_LOCKREQ_OFF, cancels, count);
918 ptlrpc_req_set_repsize(req, 1, NULL);
919 if (flags & LDLM_FL_ASYNC) {
920 ptlrpcd_add_req(req);
924 rc = ptlrpc_queue_wait(req);
927 CDEBUG(D_DLMTRACE, "client/server (nid %s) "
928 "out of sync -- not fatal\n",
929 libcfs_nid2str(req->rq_import->
930 imp_connection->c_peer.nid));
932 } else if (rc == -ETIMEDOUT && /* check there was no reconnect*/
933 req->rq_import_generation == imp->imp_generation) {
934 ptlrpc_req_finished(req);
936 } else if (rc != ELDLM_OK) {
937 CERROR("Got rc %d from cancel RPC: canceling "
945 ptlrpc_req_finished(req);
948 return sent ? sent : rc;
951 static inline struct ldlm_pool *ldlm_imp2pl(struct obd_import *imp)
953 LASSERT(imp != NULL);
954 return &imp->imp_obd->obd_namespace->ns_pool;
957 int ldlm_cli_update_pool(struct ptlrpc_request *req)
959 struct ldlm_pool *pl;
962 if (!imp_connect_lru_resize(req->rq_import))
965 if (lustre_msg_get_slv(req->rq_repmsg) == 0 ||
966 lustre_msg_get_limit(req->rq_repmsg) == 0)
969 pl = ldlm_imp2pl(req->rq_import);
971 spin_lock(&pl->pl_lock);
973 /* Check if we need to wakeup pools thread for fast SLV change.
974 * This is only done when threads period is noticably long like
976 #if defined(__KERNEL__) && (LDLM_POOLS_THREAD_PERIOD >= 10)
978 __u64 old_slv, new_slv, fast_change;
980 old_slv = ldlm_pool_get_slv(pl);
981 new_slv = lustre_msg_get_slv(req->rq_repmsg);
982 fast_change = old_slv * LDLM_POOLS_FAST_SLV_CHANGE;
983 do_div(fast_change, 100);
985 /* Wake up pools thread only if SLV has changed more than
986 * 50% since last update. In this case we want to react asap.
987 * Otherwise it is no sense to wake up pools as they are
988 * re-calculated every LDLM_POOLS_THREAD_PERIOD anyways. */
989 if (old_slv > new_slv && old_slv - new_slv > fast_change)
993 /* In some cases RPC may contain slv and limit zeroed out. This is
994 * the case when server does not support lru resize feature. This is
995 * also possible in some recovery cases when server side reqs have no
996 * ref to obd export and thus access to server side namespace is no
998 if (lustre_msg_get_slv(req->rq_repmsg) != 0 &&
999 lustre_msg_get_limit(req->rq_repmsg) != 0) {
1000 ldlm_pool_set_slv(pl, lustre_msg_get_slv(req->rq_repmsg));
1001 ldlm_pool_set_limit(pl, lustre_msg_get_limit(req->rq_repmsg));
1003 DEBUG_REQ(D_HA, req, "zero SLV or Limit found "
1004 "(SLV: "LPU64", Limit: %u)",
1005 lustre_msg_get_slv(req->rq_repmsg),
1006 lustre_msg_get_limit(req->rq_repmsg));
1008 spin_unlock(&pl->pl_lock);
1012 EXPORT_SYMBOL(ldlm_cli_update_pool);
1014 int ldlm_cli_cancel(struct lustre_handle *lockh)
1016 struct ldlm_lock *lock;
1017 CFS_LIST_HEAD(cancels);
1021 /* concurrent cancels on the same handle can happen */
1022 lock = __ldlm_handle2lock(lockh, LDLM_FL_CANCELING);
1024 LDLM_DEBUG_NOLOCK("lock is already being destroyed\n");
1028 rc = ldlm_cli_cancel_local(lock);
1029 list_add(&lock->l_bl_ast, &cancels);
1031 if (rc == LDLM_FL_BL_AST) {
1032 rc = ldlm_cli_cancel_req(lock->l_conn_export, &cancels, 1, 0);
1033 } else if (rc == LDLM_FL_CANCELING) {
1034 struct ldlm_namespace *ns = lock->l_resource->lr_namespace;
1035 int avail = ldlm_cancel_handles_avail(lock->l_conn_export);
1039 flags = ns_connect_lru_resize(ns) ?
1040 LDLM_CANCEL_LRUR : LDLM_CANCEL_AGED;
1041 cancel = ns_connect_lru_resize(ns) ? 0 : 1;
1043 cancel += ldlm_cancel_lru_local(ns, &cancels, 0,
1044 avail - cancel, flags);
1045 ldlm_cli_cancel_list(&cancels, cancel, NULL, 0, 0);
1047 if (rc != LDLM_FL_CANCELING)
1048 LDLM_LOCK_PUT(lock);
1049 RETURN(rc < 0 ? rc : 0);
1052 /* XXX until we will have compound requests and can cut cancels from generic rpc
1053 * we need send cancels with LDLM_FL_BL_AST flag as separate rpc */
1054 static int ldlm_cancel_list(struct list_head *cancels, int count)
1056 CFS_LIST_HEAD(head);
1057 struct ldlm_lock *lock, *next;
1058 int left = 0, bl_ast = 0, rc;
1061 list_for_each_entry_safe(lock, next, cancels, l_bl_ast) {
1065 rc = ldlm_cli_cancel_local(lock);
1066 if (rc == LDLM_FL_BL_AST) {
1067 LDLM_DEBUG(lock, "Cancel lock separately");
1068 list_del_init(&lock->l_bl_ast);
1069 list_add(&lock->l_bl_ast, &head);
1073 if (rc == LDLM_FL_LOCAL_ONLY) {
1074 /* CANCEL RPC should not be sent to server. */
1075 list_del_init(&lock->l_bl_ast);
1076 LDLM_LOCK_PUT(lock);
1083 ldlm_cli_cancel_list(&head, bl_ast, NULL, 0, 0);
1090 /* cancel lock list without sending rpc to server*/
1091 static int ldlm_cancel_list_local(struct list_head *cancels, int count)
1093 struct ldlm_lock *lock, *next;
1097 list_for_each_entry_safe(lock, next, cancels, l_bl_ast) {
1100 ldlm_lock_cancel(lock);
1101 /* CANCEL RPC should not be sent to server. */
1102 list_del_init(&lock->l_bl_ast);
1103 LDLM_LOCK_PUT(lock);
1109 /* Return 1 if @lock should be canceled according to shrinker policy.
1110 * Return zero otherwise. */
1111 static int ldlm_cancel_shrink_policy(struct ldlm_namespace *ns,
1112 struct ldlm_lock *lock,
1113 int unused, int added,
1119 if (lock->l_resource->lr_type == LDLM_EXTENT) {
1120 struct ldlm_extent *l_extent;
1122 /* For all extent locks cost is 1 + number of pages in
1124 l_extent = &lock->l_policy_data.l_extent;
1125 page_nr = (l_extent->end - l_extent->start);
1126 do_div(page_nr, CFS_PAGE_SIZE);
1129 /* XXX: In fact this is evil hack, we can't access inode
1130 * here. For doing it right we need somehow to have number
1131 * of covered by lock. This should be fixed later when 10718
1133 if (lock->l_ast_data != NULL) {
1134 struct inode *inode = lock->l_ast_data;
1135 if (page_nr > inode->i_mapping->nrpages)
1136 page_nr = inode->i_mapping->nrpages;
1139 lock_cost = 1 + page_nr;
1141 /* For all locks which are not extent ones cost is 1 */
1145 /* Keep all expensive locks in lru for the memory pressure time
1146 * cancel policy. They anyways may be canceled by lru resize
1147 * pplicy if they have not small enough CLV. */
1148 return (lock_cost <= ns->ns_shrink_thumb);
1151 /* Return 1 if @lock should be canceled according to lru resize policy.
1152 * Return zero otherwise. */
1153 static int ldlm_cancel_lrur_policy(struct ldlm_namespace *ns,
1154 struct ldlm_lock *lock,
1155 int unused, int added,
1158 cfs_time_t cur = cfs_time_current();
1159 struct ldlm_pool *pl = &ns->ns_pool;
1163 spin_lock(&pl->pl_lock);
1164 slv = ldlm_pool_get_slv(pl);
1165 lvf = atomic_read(&pl->pl_lock_volume_factor);
1166 spin_unlock(&pl->pl_lock);
1168 la = cfs_duration_sec(cfs_time_sub(cur,
1169 lock->l_last_used));
1171 /* Stop when slv is not yet come from server or
1172 * lv is smaller than it is. */
1173 lv = lvf * la * unused;
1174 return (slv > 1 && lv >= slv);
1177 /* Return 1 if @lock should be canceled according to passed policy.
1178 * Return zero otherwise. */
1179 static int ldlm_cancel_passed_policy(struct ldlm_namespace *ns,
1180 struct ldlm_lock *lock,
1181 int unused, int added,
1184 /* Do nothing here, we allow canceling all locks which
1185 * are passed here from upper layer logic. So that locks
1186 * number to be canceled will be limited by @count and
1187 * @max in ldlm_cancel_lru_local(). */
1191 /* Return 1 if @lock should be canceled according to aged policy.
1192 * Return zero otherwise. */
1193 static int ldlm_cancel_aged_policy(struct ldlm_namespace *ns,
1194 struct ldlm_lock *lock,
1195 int unused, int added,
1198 /* Cancel old locks if reached asked limit. */
1199 return !((added >= asked) &&
1200 cfs_time_before_64(cfs_time_current(),
1201 cfs_time_add(lock->l_last_used,
1205 typedef int (*ldlm_cancel_lru_policy_t)(struct ldlm_namespace *,
1206 struct ldlm_lock *, int,
1209 static ldlm_cancel_lru_policy_t
1210 ldlm_cancel_lru_policy(struct ldlm_namespace *ns, int flags)
1212 if (ns_connect_lru_resize(ns)) {
1213 if (flags & LDLM_CANCEL_SHRINK)
1214 return ldlm_cancel_shrink_policy;
1215 else if (flags & LDLM_CANCEL_LRUR)
1216 return ldlm_cancel_lrur_policy;
1217 else if (flags & LDLM_CANCEL_PASSED)
1218 return ldlm_cancel_passed_policy;
1220 if (flags & LDLM_CANCEL_AGED)
1221 return ldlm_cancel_aged_policy;
1226 /* - Free space in lru for @count new locks,
1227 * redundant unused locks are canceled locally;
1228 * - also cancel locally unused aged locks;
1229 * - do not cancel more than @max locks;
1230 * - GET the found locks and add them into the @cancels list.
1232 * A client lock can be added to the l_bl_ast list only when it is
1233 * marked LDLM_FL_CANCELING. Otherwise, somebody is already doing CANCEL.
1234 * There are the following use cases: ldlm_cancel_resource_local(),
1235 * ldlm_cancel_lru_local() and ldlm_cli_cancel(), which check&set this
1236 * flag properly. As any attempt to cancel a lock rely on this flag,
1237 * l_bl_ast list is accessed later without any special locking.
1239 * Calling policies for enabled lru resize:
1240 * ----------------------------------------
1241 * flags & LDLM_CANCEL_LRUR - use lru resize policy (SLV from server) to
1242 * cancel not more than @count locks;
1244 * flags & LDLM_CANCEL_PASSED - cancel @count number of old locks (located at
1245 * the beginning of lru list);
1247 * flags & LDLM_CANCEL_SHRINK - cancel not more than @count locks according to
1248 * memory pressre policy function.
1250 int ldlm_cancel_lru_local(struct ldlm_namespace *ns, struct list_head *cancels,
1251 int count, int max, int flags)
1253 ldlm_cancel_lru_policy_t cancel_lru_policy_func;
1254 int added = 0, unused, cancel;
1255 struct ldlm_lock *lock, *next;
1258 spin_lock(&ns->ns_unused_lock);
1259 unused = ns->ns_nr_unused;
1261 if (!ns_connect_lru_resize(ns))
1262 count += unused - ns->ns_max_unused;
1264 cancel_lru_policy_func = ldlm_cancel_lru_policy(ns, flags);
1266 list_for_each_entry_safe(lock, next, &ns->ns_unused_list, l_lru) {
1267 /* Make sure that we skip locks being already in cancel. */
1268 if ((lock->l_flags & LDLM_FL_CANCELING) ||
1269 (lock->l_flags & LDLM_FL_BL_AST))
1272 /* For any flags, stop scanning if @max or passed @count is
1274 if ((max && added >= max) || (count && added >= count))
1277 /* Pass the lock through the policy filter and see if it
1278 * should stay in lru. */
1279 if (cancel_lru_policy_func != NULL) {
1280 cancel = cancel_lru_policy_func(ns, lock, unused,
1283 /* Take next lock for shrink policy, we need to check
1284 * whole list. Stop scanning for other policies. */
1285 if ((flags & LDLM_CANCEL_SHRINK) && !cancel)
1291 if (cancels != NULL) {
1292 LDLM_LOCK_GET(lock); /* dropped by bl thread */
1293 spin_unlock(&ns->ns_unused_lock);
1295 lock_res_and_lock(lock);
1296 /* Check flags again under the lock. */
1297 if ((lock->l_flags & LDLM_FL_CANCELING) ||
1298 (lock->l_flags & LDLM_FL_BL_AST) ||
1299 (ldlm_lock_remove_from_lru(lock) == 0)) {
1300 /* other thread is removing lock from lru or
1301 * somebody is already doing CANCEL or
1302 * there is a blocking request which will send
1303 * cancel by itseft. */
1304 unlock_res_and_lock(lock);
1305 LDLM_LOCK_PUT(lock);
1306 spin_lock(&ns->ns_unused_lock);
1309 LASSERT(!lock->l_readers && !lock->l_writers);
1311 /* If we have chosen to cancel this lock voluntarily, we
1312 * better send cancel notification to server, so that it
1313 * frees appropriate state. This might lead to a race
1314 * where while we are doing cancel here, server is also
1315 * silently cancelling this lock. */
1316 lock->l_flags &= ~LDLM_FL_CANCEL_ON_BLOCK;
1318 /* Setting the CBPENDING flag is a little misleading, but
1319 * prevents an important race; namely, once CBPENDING is
1320 * set, the lock can accumulate no more readers/writers.
1321 * Since readers and writers are already zero here,
1322 * ldlm_lock_decref() won't see this flag and call
1324 lock->l_flags |= LDLM_FL_CBPENDING | LDLM_FL_CANCELING;
1326 /* We can't re-add to l_lru as it confuses the refcounting
1327 * in ldlm_lock_remove_from_lru() if an AST arrives after
1328 * we drop ns_lock below. We use l_bl_ast and can't use
1329 * l_pending_chain as it is used both on server and client
1330 * nevertheless bug 5666 says it is used only on server */
1331 LASSERT(list_empty(&lock->l_bl_ast));
1332 list_add(&lock->l_bl_ast, cancels);
1333 unlock_res_and_lock(lock);
1334 spin_lock(&ns->ns_unused_lock);
1339 spin_unlock(&ns->ns_unused_lock);
1341 if (cancels == NULL)
1344 RETURN(ldlm_cancel_list(cancels, added));
1347 /* when called with LDLM_ASYNC the blocking callback will be handled
1348 * in a thread and this function will return after the thread has been
1349 * asked to call the callback. when called with LDLM_SYNC the blocking
1350 * callback will be performed in this function. */
1351 int ldlm_cancel_lru(struct ldlm_namespace *ns, int nr, ldlm_sync_t sync,
1354 CFS_LIST_HEAD(cancels);
1359 sync = LDLM_SYNC; /* force to be sync in user space */
1361 count = ldlm_cancel_lru_local(ns, &cancels, nr, 0, flags);
1362 if (sync == LDLM_ASYNC) {
1363 rc = ldlm_bl_to_thread_list(ns, NULL, &cancels, count);
1368 /* If an error occured in ASYNC mode, or
1369 * this is SYNC mode, cancel the list. */
1370 ldlm_cli_cancel_list(&cancels, count, NULL, 0, 0);
1374 /* Find and cancel locally unused locks found on resource, matched to the
1375 * given policy, mode. GET the found locks and add them into the @cancels
1377 int ldlm_cancel_resource_local(struct ldlm_resource *res,
1378 struct list_head *cancels,
1379 ldlm_policy_data_t *policy,
1380 ldlm_mode_t mode, int lock_flags,
1381 int flags, void *opaque)
1383 struct ldlm_lock *lock;
1388 list_for_each_entry(lock, &res->lr_granted, l_res_link) {
1389 if (opaque != NULL && lock->l_ast_data != opaque) {
1390 LDLM_ERROR(lock, "data %p doesn't match opaque %p",
1391 lock->l_ast_data, opaque);
1396 if (lock->l_readers || lock->l_writers) {
1397 if (flags & LDLM_FL_WARN) {
1398 LDLM_ERROR(lock, "lock in use");
1404 /* If somebody is already doing CANCEL, or blocking ast came,
1405 * skip this lock. */
1406 if (lock->l_flags & LDLM_FL_BL_AST ||
1407 lock->l_flags & LDLM_FL_CANCELING)
1410 if (lockmode_compat(lock->l_granted_mode, mode))
1413 /* If policy is given and this is IBITS lock, add to list only
1414 * those locks that match by policy. */
1415 if (policy && (lock->l_resource->lr_type == LDLM_IBITS) &&
1416 !(lock->l_policy_data.l_inodebits.bits &
1417 policy->l_inodebits.bits))
1420 /* See CBPENDING comment in ldlm_cancel_lru */
1421 lock->l_flags |= LDLM_FL_CBPENDING | LDLM_FL_CANCELING |
1424 LASSERT(list_empty(&lock->l_bl_ast));
1425 list_add(&lock->l_bl_ast, cancels);
1426 LDLM_LOCK_GET(lock);
1431 if ((flags & LDLM_FL_LOCAL_ONLY))
1432 RETURN(ldlm_cancel_list_local(cancels, count));
1434 RETURN(ldlm_cancel_list(cancels, count));
1437 /* If @req is NULL, send CANCEL request to server with handles of locks
1438 * in the @cancels. If EARLY_CANCEL is not supported, send CANCEL requests
1439 * separately per lock.
1440 * If @req is not NULL, put handles of locks in @cancels into the request
1441 * buffer at the offset @off.
1442 * Destroy @cancels at the end. */
1443 int ldlm_cli_cancel_list(struct list_head *cancels, int count,
1444 struct ptlrpc_request *req, int off, int flags)
1446 struct ldlm_lock *lock;
1450 if (list_empty(cancels) || count == 0)
1453 /* XXX: requests (both batched and not) could be sent in parallel.
1454 * Usually it is enough to have just 1 RPC, but it is possible that
1455 * there are to many locks to be cancelled in LRU or on a resource.
1456 * It would also speed up the case when the server does not support
1459 LASSERT(!list_empty(cancels));
1460 lock = list_entry(cancels->next, struct ldlm_lock, l_bl_ast);
1461 LASSERT(lock->l_conn_export);
1463 if (exp_connect_cancelset(lock->l_conn_export)) {
1466 ldlm_cancel_pack(req, off, cancels, count);
1468 res = ldlm_cli_cancel_req(lock->l_conn_export,
1472 res = ldlm_cli_cancel_req(lock->l_conn_export,
1477 CERROR("ldlm_cli_cancel_list: %d\n", res);
1482 ldlm_lock_list_put(cancels, l_bl_ast, res);
1484 LASSERT(list_empty(cancels));
1485 LASSERT(count == 0);
1489 int ldlm_cli_cancel_unused_resource(struct ldlm_namespace *ns,
1490 const struct ldlm_res_id *res_id,
1491 ldlm_policy_data_t *policy,
1492 ldlm_mode_t mode, int flags, void *opaque)
1494 struct ldlm_resource *res;
1495 CFS_LIST_HEAD(cancels);
1500 res = ldlm_resource_get(ns, NULL, res_id, 0, 0);
1502 /* This is not a problem. */
1503 CDEBUG(D_INFO, "No resource "LPU64"\n", res_id->name[0]);
1507 count = ldlm_cancel_resource_local(res, &cancels, policy, mode,
1509 rc = ldlm_cli_cancel_list(&cancels, count, NULL, 0, flags);
1511 CERROR("ldlm_cli_cancel_unused_resource: %d\n", rc);
1513 ldlm_resource_putref(res);
1517 static inline int have_no_nsresource(struct ldlm_namespace *ns)
1519 int no_resource = 0;
1521 spin_lock(&ns->ns_hash_lock);
1522 if (ns->ns_resources == 0)
1524 spin_unlock(&ns->ns_hash_lock);
1526 RETURN(no_resource);
1529 /* Cancel all locks on a namespace (or a specific resource, if given)
1530 * that have 0 readers/writers.
1532 * If flags & LDLM_FL_LOCAL_ONLY, throw the locks away without trying
1533 * to notify the server. */
1534 int ldlm_cli_cancel_unused(struct ldlm_namespace *ns,
1535 const struct ldlm_res_id *res_id,
1536 int flags, void *opaque)
1545 RETURN(ldlm_cli_cancel_unused_resource(ns, res_id, NULL,
1549 spin_lock(&ns->ns_hash_lock);
1550 for (i = 0; i < RES_HASH_SIZE; i++) {
1551 struct list_head *tmp;
1552 tmp = ns->ns_hash[i].next;
1553 while (tmp != &(ns->ns_hash[i])) {
1554 struct ldlm_resource *res;
1557 res = list_entry(tmp, struct ldlm_resource, lr_hash);
1558 ldlm_resource_getref(res);
1559 spin_unlock(&ns->ns_hash_lock);
1561 rc = ldlm_cli_cancel_unused_resource(ns, &res->lr_name,
1566 CERROR("ldlm_cli_cancel_unused ("LPU64"): %d\n",
1567 res->lr_name.name[0], rc);
1569 spin_lock(&ns->ns_hash_lock);
1571 ldlm_resource_putref_locked(res);
1574 spin_unlock(&ns->ns_hash_lock);
1579 /* join/split resource locks to/from lru list */
1580 int ldlm_cli_join_lru(struct ldlm_namespace *ns,
1581 const struct ldlm_res_id *res_id, int join)
1583 struct ldlm_resource *res;
1584 struct ldlm_lock *lock, *n;
1588 LASSERT(ns_is_client(ns));
1590 res = ldlm_resource_get(ns, NULL, res_id, LDLM_EXTENT, 0);
1593 LASSERT(res->lr_type == LDLM_EXTENT);
1599 list_for_each_entry_safe (lock, n, &res->lr_granted, l_res_link) {
1600 if (list_empty(&lock->l_lru) &&
1601 !lock->l_readers && !lock->l_writers &&
1602 !(lock->l_flags & LDLM_FL_LOCAL) &&
1603 !(lock->l_flags & LDLM_FL_CBPENDING)) {
1604 ldlm_lock_add_to_lru(lock);
1605 lock->l_flags &= ~LDLM_FL_NO_LRU;
1606 LDLM_DEBUG(lock, "join lock to lru");
1612 spin_lock(&ns->ns_unused_lock);
1613 list_for_each_entry_safe (lock, n, &ns->ns_unused_list, l_lru) {
1614 if (lock->l_resource == res) {
1615 ldlm_lock_remove_from_lru_nolock(lock);
1616 lock->l_flags |= LDLM_FL_NO_LRU;
1617 LDLM_DEBUG(lock, "split lock from lru");
1621 spin_unlock(&ns->ns_unused_lock);
1624 ldlm_resource_putref(res);
1628 /* Lock iterators. */
1630 int ldlm_resource_foreach(struct ldlm_resource *res, ldlm_iterator_t iter,
1633 struct list_head *tmp, *next;
1634 struct ldlm_lock *lock;
1635 int rc = LDLM_ITER_CONTINUE;
1640 RETURN(LDLM_ITER_CONTINUE);
1643 list_for_each_safe(tmp, next, &res->lr_granted) {
1644 lock = list_entry(tmp, struct ldlm_lock, l_res_link);
1646 if (iter(lock, closure) == LDLM_ITER_STOP)
1647 GOTO(out, rc = LDLM_ITER_STOP);
1650 list_for_each_safe(tmp, next, &res->lr_converting) {
1651 lock = list_entry(tmp, struct ldlm_lock, l_res_link);
1653 if (iter(lock, closure) == LDLM_ITER_STOP)
1654 GOTO(out, rc = LDLM_ITER_STOP);
1657 list_for_each_safe(tmp, next, &res->lr_waiting) {
1658 lock = list_entry(tmp, struct ldlm_lock, l_res_link);
1660 if (iter(lock, closure) == LDLM_ITER_STOP)
1661 GOTO(out, rc = LDLM_ITER_STOP);
1668 struct iter_helper_data {
1669 ldlm_iterator_t iter;
1673 static int ldlm_iter_helper(struct ldlm_lock *lock, void *closure)
1675 struct iter_helper_data *helper = closure;
1676 return helper->iter(lock, helper->closure);
1679 static int ldlm_res_iter_helper(struct ldlm_resource *res, void *closure)
1681 return ldlm_resource_foreach(res, ldlm_iter_helper, closure);
1684 int ldlm_namespace_foreach(struct ldlm_namespace *ns, ldlm_iterator_t iter,
1687 struct iter_helper_data helper = { iter: iter, closure: closure };
1688 return ldlm_namespace_foreach_res(ns, ldlm_res_iter_helper, &helper);
1691 int ldlm_namespace_foreach_res(struct ldlm_namespace *ns,
1692 ldlm_res_iterator_t iter, void *closure)
1694 int i, rc = LDLM_ITER_CONTINUE;
1695 struct ldlm_resource *res;
1696 struct list_head *tmp;
1699 spin_lock(&ns->ns_hash_lock);
1700 for (i = 0; i < RES_HASH_SIZE; i++) {
1701 tmp = ns->ns_hash[i].next;
1702 while (tmp != &(ns->ns_hash[i])) {
1703 res = list_entry(tmp, struct ldlm_resource, lr_hash);
1704 ldlm_resource_getref(res);
1705 spin_unlock(&ns->ns_hash_lock);
1707 rc = iter(res, closure);
1709 spin_lock(&ns->ns_hash_lock);
1711 ldlm_resource_putref_locked(res);
1712 if (rc == LDLM_ITER_STOP)
1717 spin_unlock(&ns->ns_hash_lock);
1721 /* non-blocking function to manipulate a lock whose cb_data is being put away.*/
1722 void ldlm_resource_iterate(struct ldlm_namespace *ns,
1723 const struct ldlm_res_id *res_id,
1724 ldlm_iterator_t iter, void *data)
1726 struct ldlm_resource *res;
1730 CERROR("must pass in namespace\n");
1734 res = ldlm_resource_get(ns, NULL, res_id, 0, 0);
1740 ldlm_resource_foreach(res, iter, data);
1741 ldlm_resource_putref(res);
1747 static int ldlm_chain_lock_for_replay(struct ldlm_lock *lock, void *closure)
1749 struct list_head *list = closure;
1751 /* we use l_pending_chain here, because it's unused on clients. */
1752 LASSERTF(list_empty(&lock->l_pending_chain),"lock %p next %p prev %p\n",
1753 lock, &lock->l_pending_chain.next,&lock->l_pending_chain.prev);
1754 /* bug 9573: don't replay locks left after eviction */
1755 if (!(lock->l_flags & LDLM_FL_FAILED))
1756 list_add(&lock->l_pending_chain, list);
1757 return LDLM_ITER_CONTINUE;
1760 static int replay_lock_interpret(struct ptlrpc_request *req,
1761 struct ldlm_async_args *aa, int rc)
1763 struct ldlm_lock *lock;
1764 struct ldlm_reply *reply;
1767 atomic_dec(&req->rq_import->imp_replay_inflight);
1772 reply = lustre_swab_repbuf(req, DLM_LOCKREPLY_OFF, sizeof(*reply),
1773 lustre_swab_ldlm_reply);
1774 if (reply == NULL) {
1775 CERROR("Can't unpack ldlm_reply\n");
1776 GOTO (out, rc = -EPROTO);
1779 lock = ldlm_handle2lock(&aa->lock_handle);
1781 CERROR("received replay ack for unknown local cookie "LPX64
1782 " remote cookie "LPX64 " from server %s id %s\n",
1783 aa->lock_handle.cookie, reply->lock_handle.cookie,
1784 req->rq_export->exp_client_uuid.uuid,
1785 libcfs_id2str(req->rq_peer));
1786 GOTO(out, rc = -ESTALE);
1789 lock->l_remote_handle = reply->lock_handle;
1790 LDLM_DEBUG(lock, "replayed lock:");
1791 ptlrpc_import_recovery_state_machine(req->rq_import);
1792 LDLM_LOCK_PUT(lock);
1795 ptlrpc_connect_import(req->rq_import, NULL);
1801 static int replay_one_lock(struct obd_import *imp, struct ldlm_lock *lock)
1803 struct ptlrpc_request *req;
1804 struct ldlm_request *body;
1805 struct ldlm_reply *reply;
1806 struct ldlm_async_args *aa;
1808 int size[3] = { sizeof(struct ptlrpc_body) };
1813 /* Bug 11974: Do not replay a lock which is actively being canceled */
1814 if (lock->l_flags & LDLM_FL_CANCELING) {
1815 LDLM_DEBUG(lock, "Not replaying canceled lock:");
1819 /* If this is reply-less callback lock, we cannot replay it, since
1820 * server might have long dropped it, but notification of that event was
1821 * lost by network. (and server granted conflicting lock already) */
1822 if (lock->l_flags & LDLM_FL_CANCEL_ON_BLOCK) {
1823 LDLM_DEBUG(lock, "Not replaying reply-less lock:");
1824 ldlm_lock_cancel(lock);
1828 * If granted mode matches the requested mode, this lock is granted.
1830 * If they differ, but we have a granted mode, then we were granted
1831 * one mode and now want another: ergo, converting.
1833 * If we haven't been granted anything and are on a resource list,
1834 * then we're blocked/waiting.
1836 * If we haven't been granted anything and we're NOT on a resource list,
1837 * then we haven't got a reply yet and don't have a known disposition.
1838 * This happens whenever a lock enqueue is the request that triggers
1841 if (lock->l_granted_mode == lock->l_req_mode)
1842 flags = LDLM_FL_REPLAY | LDLM_FL_BLOCK_GRANTED;
1843 else if (lock->l_granted_mode)
1844 flags = LDLM_FL_REPLAY | LDLM_FL_BLOCK_CONV;
1845 else if (!list_empty(&lock->l_res_link))
1846 flags = LDLM_FL_REPLAY | LDLM_FL_BLOCK_WAIT;
1848 flags = LDLM_FL_REPLAY;
1850 size[DLM_LOCKREQ_OFF] = sizeof(*body);
1851 req = ptlrpc_prep_req(imp, LUSTRE_DLM_VERSION, LDLM_ENQUEUE, 2, size,
1856 /* We're part of recovery, so don't wait for it. */
1857 req->rq_send_state = LUSTRE_IMP_REPLAY_LOCKS;
1859 body = lustre_msg_buf(req->rq_reqmsg, DLM_LOCKREQ_OFF, sizeof(*body));
1860 ldlm_lock2desc(lock, &body->lock_desc);
1861 body->lock_flags = flags;
1863 ldlm_lock2handle(lock, &body->lock_handle[0]);
1864 size[DLM_LOCKREPLY_OFF] = sizeof(*reply);
1865 if (lock->l_lvb_len != 0) {
1867 size[DLM_REPLY_REC_OFF] = lock->l_lvb_len;
1869 ptlrpc_req_set_repsize(req, buffers, size);
1870 /* notify the server we've replayed all requests.
1871 * also, we mark the request to be put on a dedicated
1872 * queue to be processed after all request replayes.
1874 lustre_msg_set_flags(req->rq_reqmsg, MSG_REQ_REPLAY_DONE);
1876 LDLM_DEBUG(lock, "replaying lock:");
1878 atomic_inc(&req->rq_import->imp_replay_inflight);
1879 CLASSERT(sizeof(*aa) <= sizeof(req->rq_async_args));
1880 aa = (struct ldlm_async_args *)&req->rq_async_args;
1881 aa->lock_handle = body->lock_handle[0];
1882 req->rq_interpret_reply = replay_lock_interpret;
1883 ptlrpcd_add_req(req);
1888 int ldlm_replay_locks(struct obd_import *imp)
1890 struct ldlm_namespace *ns = imp->imp_obd->obd_namespace;
1891 struct list_head list;
1892 struct ldlm_lock *lock, *next;
1896 CFS_INIT_LIST_HEAD(&list);
1898 LASSERT(atomic_read(&imp->imp_replay_inflight) == 0);
1900 /* ensure this doesn't fall to 0 before all have been queued */
1901 atomic_inc(&imp->imp_replay_inflight);
1903 (void)ldlm_namespace_foreach(ns, ldlm_chain_lock_for_replay, &list);
1905 list_for_each_entry_safe(lock, next, &list, l_pending_chain) {
1906 list_del_init(&lock->l_pending_chain);
1908 continue; /* or try to do the rest? */
1909 rc = replay_one_lock(imp, lock);
1912 atomic_dec(&imp->imp_replay_inflight);