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 Lustre, http://www.lustre.org.
8 * Lustre is free software; you can redistribute it and/or
9 * modify it under the terms of version 2 of the GNU General Public
10 * License as published by the Free Software Foundation.
12 * Lustre is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with Lustre; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 #define DEBUG_SUBSYSTEM S_LDLM
25 #include <liblustre.h>
28 #include <linux/lustre_dlm.h>
29 #include <linux/obd_class.h>
30 #include <linux/obd.h>
32 #include "ldlm_internal.h"
34 static void interrupted_completion_wait(void *data)
38 struct lock_wait_data {
39 struct ldlm_lock *lwd_lock;
43 int ldlm_expired_completion_wait(void *data)
45 struct lock_wait_data *lwd = data;
46 struct ldlm_lock *lock = lwd->lwd_lock;
47 struct obd_import *imp;
48 struct obd_device *obd;
50 if (lock->l_conn_export == NULL) {
51 static unsigned long next_dump = 0, last_dump = 0;
53 LDLM_ERROR(lock, "lock timed out; not entering recovery in "
54 "server code, just going back to sleep");
55 if (time_after(jiffies, next_dump)) {
56 last_dump = next_dump;
57 next_dump = jiffies + 300 * HZ;
58 ldlm_namespace_dump(D_DLMTRACE,
59 lock->l_resource->lr_namespace);
61 portals_debug_dumplog();
66 obd = lock->l_conn_export->exp_obd;
67 imp = obd->u.cli.cl_import;
68 ptlrpc_fail_import(imp, lwd->lwd_generation);
69 LDLM_ERROR(lock, "lock timed out, entering recovery for %s@%s",
70 imp->imp_target_uuid.uuid,
71 imp->imp_connection->c_remote_uuid.uuid);
76 int ldlm_completion_ast(struct ldlm_lock *lock, int flags, void *data)
78 /* XXX ALLOCATE - 160 bytes */
79 struct lock_wait_data lwd;
80 unsigned long irqflags;
81 struct obd_device *obd;
82 struct obd_import *imp = NULL;
83 struct l_wait_info lwi;
87 if (flags == LDLM_FL_WAIT_NOREPROC)
90 if (!(flags & (LDLM_FL_BLOCK_WAIT | LDLM_FL_BLOCK_GRANTED |
91 LDLM_FL_BLOCK_CONV))) {
92 wake_up(&lock->l_waitq);
96 LDLM_DEBUG(lock, "client-side enqueue returned a blocked lock, "
98 ldlm_lock_dump(D_OTHER, lock, 0);
99 ldlm_reprocess_all(lock->l_resource);
103 obd = class_exp2obd(lock->l_conn_export);
105 /* if this is a local lock, then there is no import */
107 imp = obd->u.cli.cl_import;
111 if (flags & LDLM_FL_NO_TIMEOUT) {
112 LDLM_DEBUG(lock, "waiting indefinitely for group lock\n");
113 lwi = LWI_INTR(interrupted_completion_wait, &lwd);
115 lwi = LWI_TIMEOUT_INTR(obd_timeout * HZ,
116 ldlm_expired_completion_wait,
117 interrupted_completion_wait, &lwd);
121 spin_lock_irqsave(&imp->imp_lock, irqflags);
122 lwd.lwd_generation = imp->imp_generation;
123 spin_unlock_irqrestore(&imp->imp_lock, irqflags);
126 /* Go to sleep until the lock is granted or cancelled. */
127 rc = l_wait_event(lock->l_waitq,
128 ((lock->l_req_mode == lock->l_granted_mode) ||
129 (lock->l_flags & LDLM_FL_FAILED)), &lwi);
131 if (lock->l_destroyed || lock->l_flags & LDLM_FL_FAILED) {
132 LDLM_DEBUG(lock, "client-side enqueue waking up: destroyed");
137 LDLM_DEBUG(lock, "client-side enqueue waking up: failed (%d)",
142 LDLM_DEBUG(lock, "client-side enqueue waking up: granted");
146 static int ldlm_cli_enqueue_local(struct ldlm_namespace *ns,
147 struct ldlm_res_id res_id,
149 ldlm_policy_data_t *policy,
152 ldlm_blocking_callback blocking,
153 ldlm_completion_callback completion,
154 ldlm_glimpse_callback glimpse,
155 void *data, __u32 lvb_len,
157 struct lustre_handle *lockh)
159 struct ldlm_lock *lock;
164 CERROR("Trying to enqueue local lock in a shadow namespace\n");
168 lock = ldlm_lock_create(ns, NULL, res_id, type, mode, blocking,
169 completion, glimpse, data, lvb_len);
171 GOTO(out_nolock, err = -ENOMEM);
172 LDLM_DEBUG(lock, "client-side local enqueue handler, new lock created");
174 ldlm_lock_addref_internal(lock, mode);
175 ldlm_lock2handle(lock, lockh);
176 lock->l_flags |= LDLM_FL_LOCAL;
177 lock->l_lvb_swabber = lvb_swabber;
179 memcpy(&lock->l_policy_data, policy, sizeof(*policy));
180 if (type == LDLM_EXTENT)
181 memcpy(&lock->l_req_extent, &policy->l_extent,
182 sizeof(policy->l_extent));
184 err = ldlm_lock_enqueue(ns, &lock, policy, flags);
189 memcpy(policy, &lock->l_policy_data, sizeof(*policy));
190 if ((*flags) & LDLM_FL_LOCK_CHANGED)
191 memcpy(&res_id, &lock->l_resource->lr_name, sizeof(res_id));
193 LDLM_DEBUG_NOLOCK("client-side local enqueue handler END (lock %p)",
196 if (lock->l_completion_ast)
197 lock->l_completion_ast(lock, *flags, NULL);
199 LDLM_DEBUG(lock, "client-side local enqueue END");
207 static void failed_lock_cleanup(struct ldlm_namespace *ns,
208 struct ldlm_lock *lock,
209 struct lustre_handle *lockh, int mode)
211 /* Set a flag to prevent us from sending a CANCEL (bug 407) */
212 l_lock(&ns->ns_lock);
213 lock->l_flags |= LDLM_FL_LOCAL_ONLY;
214 LDLM_DEBUG(lock, "setting FL_LOCAL_ONLY");
215 l_unlock(&ns->ns_lock);
217 ldlm_lock_decref_and_cancel(lockh, mode);
219 /* XXX - HACK because we shouldn't call ldlm_lock_destroy()
220 * from llite/file.c/ll_file_flock(). */
221 if (lock->l_resource->lr_type == LDLM_FLOCK) {
222 ldlm_lock_destroy(lock);
226 int ldlm_cli_enqueue(struct obd_export *exp,
227 struct ptlrpc_request *req,
228 struct ldlm_namespace *ns,
229 struct ldlm_res_id res_id,
231 ldlm_policy_data_t *policy,
234 ldlm_blocking_callback blocking,
235 ldlm_completion_callback completion,
236 ldlm_glimpse_callback glimpse,
241 struct lustre_handle *lockh)
243 struct ldlm_lock *lock;
244 struct ldlm_request *body;
245 struct ldlm_reply *reply;
246 int rc, size[3] = {0, sizeof(*body), lvb_len}, req_passed_in = 1;
247 int is_replay = *flags & LDLM_FL_REPLAY;
248 int cleanup_phase = 0;
253 rc = ldlm_cli_enqueue_local(ns, res_id, type, policy, mode,
254 flags, blocking, completion,
255 glimpse, data, lvb_len, lvb_swabber,
260 /* If we're replaying this lock, just check some invariants.
261 * If we're creating a new lock, get everything all setup nice. */
263 lock = ldlm_handle2lock(lockh);
264 LDLM_DEBUG(lock, "client-side enqueue START");
265 LASSERT(exp == lock->l_conn_export);
267 lock = ldlm_lock_create(ns, NULL, res_id, type, mode, blocking,
268 completion, glimpse, data, lvb_len);
271 /* for the local lock, add the reference */
272 ldlm_lock_addref_internal(lock, mode);
273 ldlm_lock2handle(lock, lockh);
274 lock->l_lvb_swabber = lvb_swabber;
276 memcpy(&lock->l_policy_data, policy, sizeof(*policy));
277 if (type == LDLM_EXTENT)
278 memcpy(&lock->l_req_extent, &policy->l_extent,
279 sizeof(policy->l_extent));
280 LDLM_DEBUG(lock, "client-side enqueue START");
283 /* lock not sent to server yet */
287 req = ptlrpc_prep_req(class_exp2cliimp(exp), LUSTRE_DLM_VERSION,
288 LDLM_ENQUEUE, 2, size, NULL);
290 GOTO(cleanup, rc = -ENOMEM);
294 LASSERTF(req->rq_reqmsg->buflens[MDS_REQ_INTENT_LOCKREQ_OFF] ==
295 sizeof(*body), "buflen[%d] = %d, not %d\n",
296 MDS_REQ_INTENT_LOCKREQ_OFF,
297 req->rq_reqmsg->buflens[MDS_REQ_INTENT_LOCKREQ_OFF],
300 /* Dump lock data into the request buffer */
301 body = lustre_msg_buf(req->rq_reqmsg, MDS_REQ_INTENT_LOCKREQ_OFF,
303 ldlm_lock2desc(lock, &body->lock_desc);
304 body->lock_flags = *flags;
306 memcpy(&body->lock_handle1, lockh, sizeof(*lockh));
308 /* Continue as normal. */
309 if (!req_passed_in) {
310 size[0] = sizeof(*reply);
311 req->rq_replen = lustre_msg_size(1 + (lvb_len > 0), size);
313 lock->l_conn_export = exp;
314 lock->l_export = NULL;
315 lock->l_blocking_ast = blocking;
317 LDLM_DEBUG(lock, "sending request");
318 rc = ptlrpc_queue_wait(req);
320 if (rc != ELDLM_OK) {
322 LDLM_DEBUG(lock, "client-side enqueue END (%s)",
323 rc == ELDLM_LOCK_ABORTED ? "ABORTED" : "FAILED");
324 if (rc == ELDLM_LOCK_ABORTED) {
325 /* Before we return, swab the reply */
326 reply = lustre_swab_repbuf(req, 0, sizeof(*reply),
327 lustre_swab_ldlm_reply);
329 CERROR("Can't unpack ldlm_reply\n");
334 tmplvb = lustre_swab_repbuf(req, 1, lvb_len,
337 GOTO(cleanup, rc = -EPROTO);
339 memcpy(lvb, tmplvb, lvb_len);
345 reply = lustre_swab_repbuf(req, 0, sizeof(*reply),
346 lustre_swab_ldlm_reply);
348 CERROR("Can't unpack ldlm_reply\n");
349 GOTO(cleanup, rc = -EPROTO);
352 /* lock enqueued on the server */
355 memcpy(&lock->l_remote_handle, &reply->lock_handle,
356 sizeof(lock->l_remote_handle));
357 *flags = reply->lock_flags;
359 CDEBUG(D_INFO, "local: %p, remote cookie: "LPX64", flags: 0x%x\n",
360 lock, reply->lock_handle.cookie, *flags);
362 /* If enqueue returned a blocked lock but the completion handler has
363 * already run, then it fixed up the resource and we don't need to do it
365 if ((*flags) & LDLM_FL_LOCK_CHANGED) {
366 int newmode = reply->lock_desc.l_req_mode;
368 if (newmode && newmode != lock->l_req_mode) {
369 LDLM_DEBUG(lock, "server returned different mode %s",
370 ldlm_lockname[newmode]);
371 lock->l_req_mode = newmode;
374 if (reply->lock_desc.l_resource.lr_name.name[0] !=
375 lock->l_resource->lr_name.name[0] ||
376 reply->lock_desc.l_resource.lr_name.name[1] !=
377 lock->l_resource->lr_name.name[1]) {
378 CDEBUG(D_INFO, "remote intent success, locking %ld "
380 (long)reply->lock_desc.l_resource.lr_name.name[0],
381 (long)lock->l_resource->lr_name.name[0]);
383 ldlm_lock_change_resource(ns, lock,
384 reply->lock_desc.l_resource.lr_name);
385 if (lock->l_resource == NULL) {
387 GOTO(cleanup, rc = -ENOMEM);
389 LDLM_DEBUG(lock, "client-side enqueue, new resource");
392 memcpy(&lock->l_policy_data,
393 &reply->lock_desc.l_policy_data,
394 sizeof(reply->lock_desc.l_policy_data));
395 if (type != LDLM_PLAIN)
396 LDLM_DEBUG(lock,"client-side enqueue, new policy data");
399 if ((*flags) & LDLM_FL_AST_SENT) {
400 l_lock(&ns->ns_lock);
401 lock->l_flags |= LDLM_FL_CBPENDING;
402 l_unlock(&ns->ns_lock);
403 LDLM_DEBUG(lock, "enqueue reply includes blocking AST");
406 /* If the lock has already been granted by a completion AST, don't
407 * clobber the LVB with an older one. */
408 if (lvb_len && (lock->l_req_mode != lock->l_granted_mode)) {
410 tmplvb = lustre_swab_repbuf(req, 1, lvb_len, lvb_swabber);
411 if (tmplvb == NULL) {
413 GOTO(cleanup, rc = -EPROTO);
415 memcpy(lock->l_lvb_data, tmplvb, lvb_len);
419 rc = ldlm_lock_enqueue(ns, &lock, NULL, flags);
420 if (lock->l_completion_ast != NULL) {
421 int err = lock->l_completion_ast(lock, *flags, NULL);
429 if (lvb_len && lvb != NULL) {
430 /* Copy the LVB here, and not earlier, because the completion
431 * AST (if any) can override what we got in the reply */
432 memcpy(lvb, lock->l_lvb_data, lvb_len);
435 LDLM_DEBUG(lock, "client-side enqueue END");
438 switch (cleanup_phase) {
441 failed_lock_cleanup(ns, lock, lockh, mode);
443 if (!req_passed_in && req != NULL)
444 ptlrpc_req_finished(req);
451 static int ldlm_cli_convert_local(struct ldlm_lock *lock, int new_mode,
454 struct ldlm_resource *res;
457 if (lock->l_resource->lr_namespace->ns_client) {
458 CERROR("Trying to cancel local lock\n");
461 LDLM_DEBUG(lock, "client-side local convert");
463 res = ldlm_lock_convert(lock, new_mode, flags);
465 ldlm_reprocess_all(res);
470 LDLM_DEBUG(lock, "client-side local convert handler END");
475 /* FIXME: one of ldlm_cli_convert or the server side should reject attempted
476 * conversion of locks which are on the waiting or converting queue */
477 /* Caller of this code is supposed to take care of lock readers/writers
479 int ldlm_cli_convert(struct lustre_handle *lockh, int new_mode, int *flags)
481 struct ldlm_request *body;
482 struct ldlm_reply *reply;
483 struct ldlm_lock *lock;
484 struct ldlm_resource *res;
485 struct ptlrpc_request *req = NULL;
486 int rc, size = sizeof(*body);
489 lock = ldlm_handle2lock(lockh);
496 if (lock->l_conn_export == NULL)
497 RETURN(ldlm_cli_convert_local(lock, new_mode, flags));
499 LDLM_DEBUG(lock, "client-side convert");
501 req = ptlrpc_prep_req(class_exp2cliimp(lock->l_conn_export),
502 LUSTRE_DLM_VERSION, LDLM_CONVERT, 1, &size, NULL);
504 GOTO(out, rc = -ENOMEM);
506 body = lustre_msg_buf(req->rq_reqmsg, 0, sizeof (*body));
507 memcpy(&body->lock_handle1, &lock->l_remote_handle,
508 sizeof(body->lock_handle1));
510 body->lock_desc.l_req_mode = new_mode;
511 body->lock_flags = *flags;
513 size = sizeof(*reply);
514 req->rq_replen = lustre_msg_size(1, &size);
516 rc = ptlrpc_queue_wait(req);
520 reply = lustre_swab_repbuf(req, 0, sizeof (*reply),
521 lustre_swab_ldlm_reply);
523 CERROR ("Can't unpack ldlm_reply\n");
524 GOTO (out, rc = -EPROTO);
528 GOTO(out, rc = req->rq_status);
530 res = ldlm_lock_convert(lock, new_mode, &reply->lock_flags);
532 ldlm_reprocess_all(res);
533 /* Go to sleep until the lock is granted. */
534 /* FIXME: or cancelled. */
535 if (lock->l_completion_ast) {
536 rc = lock->l_completion_ast(lock, LDLM_FL_WAIT_NOREPROC,
547 ptlrpc_req_finished(req);
551 int ldlm_cli_cancel(struct lustre_handle *lockh)
553 struct ptlrpc_request *req;
554 struct ldlm_lock *lock;
555 struct ldlm_request *body;
556 int rc = 0, size = sizeof(*body);
559 /* concurrent cancels on the same handle can happen */
560 lock = __ldlm_handle2lock(lockh, LDLM_FL_CANCELING);
564 if (lock->l_conn_export) {
566 struct obd_import *imp;
568 LDLM_DEBUG(lock, "client-side cancel");
569 /* Set this flag to prevent others from getting new references*/
570 l_lock(&lock->l_resource->lr_namespace->ns_lock);
571 lock->l_flags |= LDLM_FL_CBPENDING;
572 local_only = lock->l_flags & LDLM_FL_LOCAL_ONLY;
573 l_unlock(&lock->l_resource->lr_namespace->ns_lock);
574 ldlm_cancel_callback(lock);
577 CDEBUG(D_INFO, "not sending request (at caller's "
583 imp = class_exp2cliimp(lock->l_conn_export);
584 if (imp == NULL || imp->imp_invalid) {
585 CDEBUG(D_HA, "skipping cancel on invalid import %p\n",
590 req = ptlrpc_prep_req(imp, LUSTRE_DLM_VERSION, LDLM_CANCEL,
593 GOTO(out, rc = -ENOMEM);
594 req->rq_no_resend = 1;
596 /* XXX FIXME bug 249 */
597 req->rq_request_portal = LDLM_CANCEL_REQUEST_PORTAL;
598 req->rq_reply_portal = LDLM_CANCEL_REPLY_PORTAL;
600 body = lustre_msg_buf(req->rq_reqmsg, 0, sizeof (*body));
601 memcpy(&body->lock_handle1, &lock->l_remote_handle,
602 sizeof(body->lock_handle1));
604 req->rq_replen = lustre_msg_size(0, NULL);
606 rc = ptlrpc_queue_wait(req);
609 char str[PTL_NALFMT_SIZE];
610 CERROR("client/server (nid %s) out of sync"
612 ptlrpc_peernid2str(&req->rq_import->
613 imp_connection->c_peer, str));
614 } else if (rc == -ETIMEDOUT) {
615 ptlrpc_req_finished(req);
617 } else if (rc != ELDLM_OK) {
618 CERROR("Got rc %d from cancel RPC: canceling "
622 ptlrpc_req_finished(req);
624 ldlm_lock_cancel(lock);
626 if (lock->l_resource->lr_namespace->ns_client) {
627 LDLM_ERROR(lock, "Trying to cancel local lock\n");
630 LDLM_DEBUG(lock, "client-side local cancel");
631 ldlm_lock_cancel(lock);
632 ldlm_reprocess_all(lock->l_resource);
633 LDLM_DEBUG(lock, "client-side local cancel handler END");
642 /* when called with LDLM_ASYNC the blocking callback will be handled
643 * in a thread and this function will return after the thread has been
644 * asked to call the callback. when called with LDLM_SYNC the blocking
645 * callback will be performed in this function. */
646 int ldlm_cancel_lru(struct ldlm_namespace *ns, ldlm_sync_t sync)
648 struct list_head *tmp, *next;
649 struct ldlm_lock *lock;
655 sync = LDLM_SYNC; /* force to be sync in user space */
658 l_lock(&ns->ns_lock);
659 count = ns->ns_nr_unused - ns->ns_max_unused;
662 l_unlock(&ns->ns_lock);
666 list_for_each_safe(tmp, next, &ns->ns_unused_list) {
668 lock = list_entry(tmp, struct ldlm_lock, l_lru);
670 LASSERT(!lock->l_readers && !lock->l_writers);
672 /* Setting the CBPENDING flag is a little misleading, but
673 * prevents an important race; namely, once CBPENDING is set,
674 * the lock can accumulate no more readers/writers. Since
675 * readers and writers are already zero here, ldlm_lock_decref
676 * won't see this flag and call l_blocking_ast */
677 lock->l_flags |= LDLM_FL_CBPENDING;
679 LDLM_LOCK_GET(lock); /* dropped by bl thread */
680 ldlm_lock_remove_from_lru(lock);
681 if (sync != LDLM_ASYNC || ldlm_bl_to_thread(ns, NULL, lock))
682 list_add(&lock->l_lru, &cblist);
687 l_unlock(&ns->ns_lock);
689 list_for_each_safe(tmp, next, &cblist) {
690 lock = list_entry(tmp, struct ldlm_lock, l_lru);
691 list_del_init(&lock->l_lru);
692 ldlm_handle_bl_callback(ns, NULL, lock);
697 static int ldlm_cli_cancel_unused_resource(struct ldlm_namespace *ns,
698 struct ldlm_res_id res_id, int flags,
701 struct ldlm_resource *res;
702 struct list_head *tmp, *next, list = LIST_HEAD_INIT(list);
703 struct ldlm_ast_work *w;
706 res = ldlm_resource_get(ns, NULL, res_id, 0, 0);
708 /* This is not a problem. */
709 CDEBUG(D_INFO, "No resource "LPU64"\n", res_id.name[0]);
713 l_lock(&ns->ns_lock);
714 list_for_each(tmp, &res->lr_granted) {
715 struct ldlm_lock *lock;
716 lock = list_entry(tmp, struct ldlm_lock, l_res_link);
718 if (opaque != NULL && lock->l_ast_data != opaque) {
719 LDLM_ERROR(lock, "data %p doesn't match opaque %p",
720 lock->l_ast_data, opaque);
724 if (lock->l_readers || lock->l_writers) {
725 if (flags & LDLM_FL_CONFIG_CHANGE)
726 lock->l_flags |= LDLM_FL_CBPENDING;
727 else if (flags & LDLM_FL_WARN)
728 LDLM_ERROR(lock, "lock in use");
732 /* See CBPENDING comment in ldlm_cancel_lru */
733 lock->l_flags |= LDLM_FL_CBPENDING;
735 OBD_ALLOC(w, sizeof(*w));
738 w->w_lock = LDLM_LOCK_GET(lock);
740 list_add(&w->w_list, &list);
742 l_unlock(&ns->ns_lock);
744 list_for_each_safe(tmp, next, &list) {
745 struct lustre_handle lockh;
747 w = list_entry(tmp, struct ldlm_ast_work, w_list);
749 if (flags & LDLM_FL_LOCAL_ONLY) {
750 ldlm_lock_cancel(w->w_lock);
752 ldlm_lock2handle(w->w_lock, &lockh);
753 rc = ldlm_cli_cancel(&lockh);
755 CERROR("ldlm_cli_cancel: %d\n", rc);
757 list_del(&w->w_list);
758 LDLM_LOCK_PUT(w->w_lock);
759 OBD_FREE(w, sizeof(*w));
762 ldlm_resource_putref(res);
767 static inline int have_no_nsresource(struct ldlm_namespace *ns)
771 spin_lock(&ns->ns_counter_lock);
772 if (ns->ns_resources == 0)
774 spin_unlock(&ns->ns_counter_lock);
779 /* Cancel all locks on a namespace (or a specific resource, if given)
780 * that have 0 readers/writers.
782 * If flags & LDLM_FL_LOCAL_ONLY, throw the locks away without trying
783 * to notify the server.
784 * If flags & LDLM_FL_NO_CALLBACK, don't run the cancel callback.
785 * If flags & LDLM_FL_WARN, print a warning if some locks are still in use.
786 * If flags & LDLM_FL_CONFIG_CHANGE, mark all locks as having a pending callback
788 int ldlm_cli_cancel_unused(struct ldlm_namespace *ns,
789 struct ldlm_res_id *res_id, int flags, void *opaque)
792 struct l_wait_info lwi = { 0 };
799 RETURN(ldlm_cli_cancel_unused_resource(ns, *res_id, flags,
802 l_lock(&ns->ns_lock);
803 for (i = 0; i < RES_HASH_SIZE; i++) {
804 struct list_head *tmp, *next;
805 list_for_each_safe(tmp, next, &(ns->ns_hash[i])) {
807 struct ldlm_resource *res;
808 res = list_entry(tmp, struct ldlm_resource, lr_hash);
809 ldlm_resource_getref(res);
810 l_unlock(&ns->ns_lock);
812 rc = ldlm_cli_cancel_unused_resource(ns, res->lr_name,
815 CERROR("cancel_unused_res ("LPU64"): %d\n",
816 res->lr_name.name[0], rc);
818 l_lock(&ns->ns_lock);
820 ldlm_resource_putref(res);
823 l_unlock(&ns->ns_lock);
824 if (flags & LDLM_FL_CONFIG_CHANGE)
825 l_wait_event(ns->ns_waitq, have_no_nsresource(ns), &lwi);
830 /* Lock iterators. */
832 int ldlm_resource_foreach(struct ldlm_resource *res, ldlm_iterator_t iter,
835 struct list_head *tmp, *next;
836 struct ldlm_lock *lock;
837 int rc = LDLM_ITER_CONTINUE;
838 struct ldlm_namespace *ns = res->lr_namespace;
843 RETURN(LDLM_ITER_CONTINUE);
845 l_lock(&ns->ns_lock);
846 list_for_each_safe(tmp, next, &res->lr_granted) {
847 lock = list_entry(tmp, struct ldlm_lock, l_res_link);
849 if (iter(lock, closure) == LDLM_ITER_STOP)
850 GOTO(out, rc = LDLM_ITER_STOP);
853 list_for_each_safe(tmp, next, &res->lr_converting) {
854 lock = list_entry(tmp, struct ldlm_lock, l_res_link);
856 if (iter(lock, closure) == LDLM_ITER_STOP)
857 GOTO(out, rc = LDLM_ITER_STOP);
860 list_for_each_safe(tmp, next, &res->lr_waiting) {
861 lock = list_entry(tmp, struct ldlm_lock, l_res_link);
863 if (iter(lock, closure) == LDLM_ITER_STOP)
864 GOTO(out, rc = LDLM_ITER_STOP);
867 l_unlock(&ns->ns_lock);
871 struct iter_helper_data {
872 ldlm_iterator_t iter;
876 static int ldlm_iter_helper(struct ldlm_lock *lock, void *closure)
878 struct iter_helper_data *helper = closure;
879 return helper->iter(lock, helper->closure);
882 static int ldlm_res_iter_helper(struct ldlm_resource *res, void *closure)
884 return ldlm_resource_foreach(res, ldlm_iter_helper, closure);
887 int ldlm_namespace_foreach(struct ldlm_namespace *ns, ldlm_iterator_t iter,
890 struct iter_helper_data helper = { iter: iter, closure: closure };
891 return ldlm_namespace_foreach_res(ns, ldlm_res_iter_helper, &helper);
894 int ldlm_namespace_foreach_res(struct ldlm_namespace *ns,
895 ldlm_res_iterator_t iter, void *closure)
897 int i, rc = LDLM_ITER_CONTINUE;
899 l_lock(&ns->ns_lock);
900 for (i = 0; i < RES_HASH_SIZE; i++) {
901 struct list_head *tmp, *next;
902 list_for_each_safe(tmp, next, &(ns->ns_hash[i])) {
903 struct ldlm_resource *res =
904 list_entry(tmp, struct ldlm_resource, lr_hash);
906 ldlm_resource_getref(res);
907 rc = iter(res, closure);
908 ldlm_resource_putref(res);
909 if (rc == LDLM_ITER_STOP)
914 l_unlock(&ns->ns_lock);
918 /* non-blocking function to manipulate a lock whose cb_data is being put away.*/
919 void ldlm_change_cbdata(struct ldlm_namespace *ns, struct ldlm_res_id *res_id,
920 ldlm_iterator_t iter, void *data)
922 struct ldlm_resource *res;
926 CERROR("must pass in namespace\n");
930 res = ldlm_resource_get(ns, NULL, *res_id, 0, 0);
936 l_lock(&ns->ns_lock);
937 ldlm_resource_foreach(res, iter, data);
938 l_unlock(&ns->ns_lock);
939 ldlm_resource_putref(res);
945 static int ldlm_chain_lock_for_replay(struct ldlm_lock *lock, void *closure)
947 struct list_head *list = closure;
949 /* we use l_pending_chain here, because it's unused on clients. */
950 list_add(&lock->l_pending_chain, list);
951 return LDLM_ITER_CONTINUE;
954 static int replay_lock_interpret(struct ptlrpc_request *req,
957 struct ldlm_lock *lock;
958 struct ldlm_reply *reply;
960 atomic_dec(&req->rq_import->imp_replay_inflight);
964 lock = req->rq_async_args.pointer_arg[0];
965 LASSERT(lock != NULL);
967 reply = lustre_swab_repbuf(req, 0, sizeof (*reply),
968 lustre_swab_ldlm_reply);
970 CERROR("Can't unpack ldlm_reply\n");
971 GOTO (out, rc = -EPROTO);
974 memcpy(&lock->l_remote_handle, &reply->lock_handle,
975 sizeof(lock->l_remote_handle));
976 LDLM_DEBUG(lock, "replayed lock:");
977 ptlrpc_import_recovery_state_machine(req->rq_import);
980 ptlrpc_connect_import(req->rq_import, NULL);
985 static int replay_one_lock(struct obd_import *imp, struct ldlm_lock *lock)
987 struct ptlrpc_request *req;
988 struct ldlm_request *body;
989 struct ldlm_reply *reply;
991 int size[2] = {0, sizeof(*body)};
995 * If granted mode matches the requested mode, this lock is granted.
997 * If they differ, but we have a granted mode, then we were granted
998 * one mode and now want another: ergo, converting.
1000 * If we haven't been granted anything and are on a resource list,
1001 * then we're blocked/waiting.
1003 * If we haven't been granted anything and we're NOT on a resource list,
1004 * then we haven't got a reply yet and don't have a known disposition.
1005 * This happens whenever a lock enqueue is the request that triggers
1008 if (lock->l_granted_mode == lock->l_req_mode)
1009 flags = LDLM_FL_REPLAY | LDLM_FL_BLOCK_GRANTED;
1010 else if (lock->l_granted_mode)
1011 flags = LDLM_FL_REPLAY | LDLM_FL_BLOCK_CONV;
1012 else if (!list_empty(&lock->l_res_link))
1013 flags = LDLM_FL_REPLAY | LDLM_FL_BLOCK_WAIT;
1015 flags = LDLM_FL_REPLAY;
1017 req = ptlrpc_prep_req(imp, LUSTRE_DLM_VERSION, LDLM_ENQUEUE,
1022 /* We're part of recovery, so don't wait for it. */
1023 req->rq_send_state = LUSTRE_IMP_REPLAY_LOCKS;
1025 body = lustre_msg_buf(req->rq_reqmsg, 1, sizeof (*body));
1026 ldlm_lock2desc(lock, &body->lock_desc);
1027 body->lock_flags = flags;
1029 ldlm_lock2handle(lock, &body->lock_handle1);
1030 size[0] = sizeof(*reply);
1031 if (lock->l_lvb_len != 0) {
1033 size[1] = lock->l_lvb_len;
1035 req->rq_replen = lustre_msg_size(buffers, size);
1037 LDLM_DEBUG(lock, "replaying lock:");
1039 atomic_inc(&req->rq_import->imp_replay_inflight);
1040 req->rq_async_args.pointer_arg[0] = lock;
1041 req->rq_interpret_reply = replay_lock_interpret;
1042 ptlrpcd_add_req(req);
1047 int ldlm_replay_locks(struct obd_import *imp)
1049 struct ldlm_namespace *ns = imp->imp_obd->obd_namespace;
1050 struct list_head list, *pos, *next;
1051 struct ldlm_lock *lock;
1055 INIT_LIST_HEAD(&list);
1057 LASSERT(atomic_read(&imp->imp_replay_inflight) == 0);
1058 LASSERT(ns != NULL);
1060 /* ensure this doesn't fall to 0 before all have been queued */
1061 atomic_inc(&imp->imp_replay_inflight);
1063 l_lock(&ns->ns_lock);
1064 (void)ldlm_namespace_foreach(ns, ldlm_chain_lock_for_replay, &list);
1066 list_for_each_safe(pos, next, &list) {
1067 lock = list_entry(pos, struct ldlm_lock, l_pending_chain);
1068 rc = replay_one_lock(imp, lock);
1070 break; /* or try to do the rest? */
1072 l_unlock(&ns->ns_lock);
1074 atomic_dec(&imp->imp_replay_inflight);