4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.gnu.org/licenses/gpl-2.0.html
23 * Copyright (c) 2003 Hewlett-Packard Development Company LP.
24 * Developed under the sponsorship of the US Government under
25 * Subcontract No. B514193
27 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
30 * Copyright (c) 2010, 2017, Intel Corporation.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
38 * This file implements POSIX lock type for Lustre.
39 * Its policy properties are start and end of extent and PID.
41 * These locks are only done through MDS due to POSIX semantics requiring
42 * e.g. that locks could be only partially released and as such split into
43 * two parts, and also that two adjacent locks from the same process may be
44 * merged into a single wider lock.
46 * Lock modes are mapped like this:
47 * PR and PW for READ and WRITE locks
48 * NL to request a releasing of a portion of the lock
50 * These flock locks never timeout.
53 #define DEBUG_SUBSYSTEM S_LDLM
55 #include <linux/list.h>
56 #include <lustre_dlm.h>
57 #include <obd_support.h>
58 #include <obd_class.h>
59 #include <lustre_lib.h>
61 #include "ldlm_internal.h"
63 int ldlm_flock_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
64 void *data, int flag);
67 * list_for_remaining_safe - iterate over the remaining entries in a list
68 * and safeguard against removal of a list entry.
69 * \param pos the &struct list_head to use as a loop counter. pos MUST
70 * have been initialized prior to using it in this macro.
71 * \param n another &struct list_head to use as temporary storage
72 * \param head the head for your list.
74 #define list_for_remaining_safe(pos, n, head) \
75 for (n = pos->next; pos != (head); pos = n, n = pos->next)
78 ldlm_same_flock_owner(struct ldlm_lock *lock, struct ldlm_lock *new)
80 return((new->l_policy_data.l_flock.owner ==
81 lock->l_policy_data.l_flock.owner) &&
82 (new->l_export == lock->l_export));
86 ldlm_flocks_overlap(struct ldlm_lock *lock, struct ldlm_lock *new)
88 return((new->l_policy_data.l_flock.start <=
89 lock->l_policy_data.l_flock.end) &&
90 (new->l_policy_data.l_flock.end >=
91 lock->l_policy_data.l_flock.start));
94 static inline void ldlm_flock_blocking_link(struct ldlm_lock *req,
95 struct ldlm_lock *lock)
98 if (req->l_export == NULL)
101 LASSERT(hlist_unhashed(&req->l_exp_flock_hash));
103 req->l_policy_data.l_flock.blocking_owner =
104 lock->l_policy_data.l_flock.owner;
105 req->l_policy_data.l_flock.blocking_export =
107 atomic_set(&req->l_policy_data.l_flock.blocking_refs, 0);
109 cfs_hash_add(req->l_export->exp_flock_hash,
110 &req->l_policy_data.l_flock.owner,
111 &req->l_exp_flock_hash);
114 static inline void ldlm_flock_blocking_unlink(struct ldlm_lock *req)
116 /* For server only */
117 if (req->l_export == NULL)
120 check_res_locked(req->l_resource);
121 if (req->l_export->exp_flock_hash != NULL &&
122 !hlist_unhashed(&req->l_exp_flock_hash))
123 cfs_hash_del(req->l_export->exp_flock_hash,
124 &req->l_policy_data.l_flock.owner,
125 &req->l_exp_flock_hash);
129 ldlm_flock_destroy(struct ldlm_lock *lock, enum ldlm_mode mode, __u64 flags)
133 LDLM_DEBUG(lock, "ldlm_flock_destroy(mode: %d, flags: %#llx)",
136 /* Safe to not lock here, since it should be empty anyway */
137 LASSERT(hlist_unhashed(&lock->l_exp_flock_hash));
139 list_del_init(&lock->l_res_link);
140 if (flags == LDLM_FL_WAIT_NOREPROC) {
141 /* client side - set a flag to prevent sending a CANCEL */
142 lock->l_flags |= LDLM_FL_LOCAL_ONLY | LDLM_FL_CBPENDING;
144 /* when reaching here, it is under lock_res_and_lock(). Thus,
145 need call the nolock version of ldlm_lock_decref_internal*/
146 ldlm_lock_decref_internal_nolock(lock, mode);
149 ldlm_lock_destroy_nolock(lock);
154 * POSIX locks deadlock detection code.
156 * Given a new lock \a req and an existing lock \a bl_lock it conflicts
157 * with, we need to iterate through all blocked POSIX locks for this
158 * export and see if there is a deadlock condition arising. (i.e. when
159 * one client holds a lock on something and want a lock on something
160 * else and at the same time another client has the opposite situation).
163 struct ldlm_flock_lookup_cb_data {
165 struct ldlm_lock *lock;
166 struct obd_export *exp;
169 static int ldlm_flock_lookup_cb(struct cfs_hash *hs, struct cfs_hash_bd *bd,
170 struct hlist_node *hnode, void *data)
172 struct ldlm_flock_lookup_cb_data *cb_data = data;
173 struct obd_export *exp = cfs_hash_object(hs, hnode);
174 struct ldlm_lock *lock;
176 lock = cfs_hash_lookup(exp->exp_flock_hash, cb_data->bl_owner);
180 /* Stop on first found lock. Same process can't sleep twice */
181 cb_data->lock = lock;
182 cb_data->exp = class_export_get(exp);
188 ldlm_flock_deadlock(struct ldlm_lock *req, struct ldlm_lock *bl_lock)
190 struct obd_export *req_exp = req->l_export;
191 struct obd_export *bl_exp = bl_lock->l_export;
192 __u64 req_owner = req->l_policy_data.l_flock.owner;
193 __u64 bl_owner = bl_lock->l_policy_data.l_flock.owner;
195 /* For server only */
199 class_export_get(bl_exp);
201 struct ldlm_flock_lookup_cb_data cb_data = {
202 .bl_owner = &bl_owner,
205 struct obd_export *bl_exp_new;
206 struct ldlm_lock *lock = NULL;
207 struct ldlm_flock *flock;
209 if (bl_exp->exp_flock_hash != NULL) {
210 cfs_hash_for_each_key(bl_exp->exp_obd->obd_nid_hash,
211 &bl_exp->exp_connection->c_peer.nid,
212 ldlm_flock_lookup_cb, &cb_data);
218 class_export_put(bl_exp);
219 bl_exp = cb_data.exp;
221 LASSERT(req != lock);
222 flock = &lock->l_policy_data.l_flock;
223 LASSERT(flock->owner == bl_owner);
224 bl_owner = flock->blocking_owner;
225 bl_exp_new = class_export_get(flock->blocking_export);
226 class_export_put(bl_exp);
228 cfs_hash_put(bl_exp->exp_flock_hash, &lock->l_exp_flock_hash);
231 if (bl_exp->exp_failed)
234 if (bl_owner == req_owner &&
235 (bl_exp->exp_connection->c_peer.nid ==
236 req_exp->exp_connection->c_peer.nid)) {
237 class_export_put(bl_exp);
241 class_export_put(bl_exp);
246 static void ldlm_flock_cancel_on_deadlock(struct ldlm_lock *lock,
247 struct list_head *work_list)
249 CDEBUG(D_INFO, "reprocess deadlock req=%p\n", lock);
251 if ((exp_connect_flags(lock->l_export) &
252 OBD_CONNECT_FLOCK_DEAD) == 0) {
253 CERROR("deadlock found, but client doesn't "
254 "support flock canceliation\n");
256 LASSERT(lock->l_completion_ast);
257 LASSERT(!ldlm_is_ast_sent(lock));
258 lock->l_flags |= LDLM_FL_AST_SENT | LDLM_FL_CANCEL_ON_BLOCK |
259 LDLM_FL_FLOCK_DEADLOCK;
260 ldlm_flock_blocking_unlink(lock);
261 ldlm_resource_unlink_lock(lock);
262 ldlm_add_ast_work_item(lock, NULL, work_list);
267 * Process a granting attempt for flock lock.
268 * Must be called under ns lock held.
270 * This function looks for any conflicts for \a lock in the granted or
271 * waiting queues. The lock is granted if no conflicts are found in
275 ldlm_process_flock_lock(struct ldlm_lock *req, __u64 *flags,
276 enum ldlm_process_intention intention,
277 enum ldlm_error *err, struct list_head *work_list)
279 struct ldlm_resource *res = req->l_resource;
280 struct ldlm_namespace *ns = ldlm_res_to_ns(res);
281 struct list_head *tmp;
282 struct list_head *ownlocks = NULL;
283 struct ldlm_lock *lock = NULL;
284 struct ldlm_lock *new = req;
285 struct ldlm_lock *new2 = NULL;
286 enum ldlm_mode mode = req->l_req_mode;
287 int local = ns_is_client(ns);
288 int added = (mode == LCK_NL);
291 const struct ldlm_callback_suite null_cbs = { NULL };
292 struct list_head *grant_work = intention == LDLM_PROCESS_ENQUEUE ?
296 CDEBUG(D_DLMTRACE, "flags %#llx owner %llu pid %u mode %u start "
297 "%llu end %llu\n", *flags,
298 new->l_policy_data.l_flock.owner,
299 new->l_policy_data.l_flock.pid, mode,
300 req->l_policy_data.l_flock.start,
301 req->l_policy_data.l_flock.end);
306 /* No blocking ASTs are sent to the clients for
307 * Posix file & record locks */
308 req->l_blocking_ast = NULL;
310 /* Called on the server for lock cancels. */
311 req->l_blocking_ast = ldlm_flock_blocking_ast;
315 if ((*flags == LDLM_FL_WAIT_NOREPROC) || (mode == LCK_NL)) {
316 /* This loop determines where this processes locks start
317 * in the resource lr_granted list. */
318 list_for_each(tmp, &res->lr_granted) {
319 lock = list_entry(tmp, struct ldlm_lock,
321 if (ldlm_same_flock_owner(lock, req)) {
327 int reprocess_failed = 0;
328 lockmode_verify(mode);
330 /* This loop determines if there are existing locks
331 * that conflict with the new lock request. */
332 list_for_each(tmp, &res->lr_granted) {
333 lock = list_entry(tmp, struct ldlm_lock,
336 if (ldlm_same_flock_owner(lock, req)) {
342 /* locks are compatible, overlap doesn't matter */
343 if (lockmode_compat(lock->l_granted_mode, mode))
346 if (!ldlm_flocks_overlap(lock, req))
349 if (intention != LDLM_PROCESS_ENQUEUE) {
350 reprocess_failed = 1;
351 if (ldlm_flock_deadlock(req, lock)) {
352 ldlm_flock_cancel_on_deadlock(req,
354 RETURN(LDLM_ITER_CONTINUE);
359 if (*flags & LDLM_FL_BLOCK_NOWAIT) {
360 ldlm_flock_destroy(req, mode, *flags);
362 RETURN(LDLM_ITER_STOP);
365 if (*flags & LDLM_FL_TEST_LOCK) {
366 ldlm_flock_destroy(req, mode, *flags);
367 req->l_req_mode = lock->l_granted_mode;
368 req->l_policy_data.l_flock.pid =
369 lock->l_policy_data.l_flock.pid;
370 req->l_policy_data.l_flock.start =
371 lock->l_policy_data.l_flock.start;
372 req->l_policy_data.l_flock.end =
373 lock->l_policy_data.l_flock.end;
374 *flags |= LDLM_FL_LOCK_CHANGED;
375 RETURN(LDLM_ITER_STOP);
378 /* add lock to blocking list before deadlock
379 * check to prevent race */
380 ldlm_flock_blocking_link(req, lock);
382 if (ldlm_flock_deadlock(req, lock)) {
383 ldlm_flock_blocking_unlink(req);
384 ldlm_flock_destroy(req, mode, *flags);
386 RETURN(LDLM_ITER_STOP);
389 ldlm_resource_add_lock(res, &res->lr_waiting, req);
390 *flags |= LDLM_FL_BLOCK_GRANTED;
391 RETURN(LDLM_ITER_STOP);
393 if (reprocess_failed)
394 RETURN(LDLM_ITER_CONTINUE);
397 if (*flags & LDLM_FL_TEST_LOCK) {
398 ldlm_flock_destroy(req, mode, *flags);
399 req->l_req_mode = LCK_NL;
400 *flags |= LDLM_FL_LOCK_CHANGED;
401 RETURN(LDLM_ITER_STOP);
404 /* In case we had slept on this lock request take it off of the
405 * deadlock detection hash list. */
406 ldlm_flock_blocking_unlink(req);
408 /* Scan the locks owned by this process that overlap this request.
409 * We may have to merge or split existing locks. */
412 ownlocks = &res->lr_granted;
414 list_for_remaining_safe(ownlocks, tmp, &res->lr_granted) {
415 lock = list_entry(ownlocks, struct ldlm_lock, l_res_link);
417 if (!ldlm_same_flock_owner(lock, new))
420 if (lock->l_granted_mode == mode) {
421 /* If the modes are the same then we need to process
422 * locks that overlap OR adjoin the new lock. The extra
423 * logic condition is necessary to deal with arithmetic
424 * overflow and underflow. */
425 if ((new->l_policy_data.l_flock.start >
426 (lock->l_policy_data.l_flock.end + 1))
427 && (lock->l_policy_data.l_flock.end !=
431 if ((new->l_policy_data.l_flock.end <
432 (lock->l_policy_data.l_flock.start - 1))
433 && (lock->l_policy_data.l_flock.start != 0))
436 if (new->l_policy_data.l_flock.start <
437 lock->l_policy_data.l_flock.start) {
438 lock->l_policy_data.l_flock.start =
439 new->l_policy_data.l_flock.start;
441 new->l_policy_data.l_flock.start =
442 lock->l_policy_data.l_flock.start;
445 if (new->l_policy_data.l_flock.end >
446 lock->l_policy_data.l_flock.end) {
447 lock->l_policy_data.l_flock.end =
448 new->l_policy_data.l_flock.end;
450 new->l_policy_data.l_flock.end =
451 lock->l_policy_data.l_flock.end;
455 ldlm_flock_destroy(lock, mode, *flags);
463 if (new->l_policy_data.l_flock.start >
464 lock->l_policy_data.l_flock.end)
467 if (new->l_policy_data.l_flock.end <
468 lock->l_policy_data.l_flock.start)
473 if (new->l_policy_data.l_flock.start <=
474 lock->l_policy_data.l_flock.start) {
475 if (new->l_policy_data.l_flock.end <
476 lock->l_policy_data.l_flock.end) {
477 lock->l_policy_data.l_flock.start =
478 new->l_policy_data.l_flock.end + 1;
481 ldlm_flock_destroy(lock, lock->l_req_mode, *flags);
484 if (new->l_policy_data.l_flock.end >=
485 lock->l_policy_data.l_flock.end) {
486 lock->l_policy_data.l_flock.end =
487 new->l_policy_data.l_flock.start - 1;
491 /* split the existing lock into two locks */
493 /* if this is an F_UNLCK operation then we could avoid
494 * allocating a new lock and use the req lock passed in
495 * with the request but this would complicate the reply
496 * processing since updates to req get reflected in the
497 * reply. The client side replays the lock request so
498 * it must see the original lock data in the reply. */
500 /* XXX - if ldlm_lock_new() can sleep we should
501 * release the lr_lock, allocate the new lock,
502 * and restart processing this lock. */
504 unlock_res_and_lock(req);
505 new2 = ldlm_lock_create(ns, &res->lr_name, LDLM_FLOCK,
506 lock->l_granted_mode, &null_cbs,
507 NULL, 0, LVB_T_NONE);
508 lock_res_and_lock(req);
510 ldlm_flock_destroy(req, lock->l_granted_mode,
512 *err = PTR_ERR(new2);
513 RETURN(LDLM_ITER_STOP);
520 new2->l_granted_mode = lock->l_granted_mode;
521 new2->l_policy_data.l_flock.pid =
522 new->l_policy_data.l_flock.pid;
523 new2->l_policy_data.l_flock.owner =
524 new->l_policy_data.l_flock.owner;
525 new2->l_policy_data.l_flock.start =
526 lock->l_policy_data.l_flock.start;
527 new2->l_policy_data.l_flock.end =
528 new->l_policy_data.l_flock.start - 1;
529 lock->l_policy_data.l_flock.start =
530 new->l_policy_data.l_flock.end + 1;
531 new2->l_conn_export = lock->l_conn_export;
532 if (lock->l_export != NULL) {
533 new2->l_export = class_export_lock_get(lock->l_export, new2);
534 if (new2->l_export->exp_lock_hash &&
535 hlist_unhashed(&new2->l_exp_hash))
536 cfs_hash_add(new2->l_export->exp_lock_hash,
537 &new2->l_remote_handle,
540 if (*flags == LDLM_FL_WAIT_NOREPROC)
541 ldlm_lock_addref_internal_nolock(new2,
542 lock->l_granted_mode);
544 /* insert new2 at lock */
545 ldlm_resource_add_lock(res, ownlocks, new2);
546 LDLM_LOCK_RELEASE(new2);
550 /* if new2 is created but never used, destroy it*/
551 if (splitted == 0 && new2 != NULL)
552 ldlm_lock_destroy_nolock(new2);
554 /* At this point we're granting the lock request. */
555 req->l_granted_mode = req->l_req_mode;
557 /* Add req to the granted queue before calling ldlm_reprocess_all(). */
559 list_del_init(&req->l_res_link);
560 /* insert new lock before ownlocks in list. */
561 ldlm_resource_add_lock(res, ownlocks, req);
564 if (*flags != LDLM_FL_WAIT_NOREPROC) {
565 #ifdef HAVE_SERVER_SUPPORT
566 if (intention == LDLM_PROCESS_ENQUEUE) {
567 /* If this is an unlock, reprocess the waitq and
568 * send completions ASTs for locks that can now be
569 * granted. The only problem with doing this
570 * reprocessing here is that the completion ASTs for
571 * newly granted locks will be sent before the unlock
572 * completion is sent. It shouldn't be an issue. Also
573 * note that ldlm_process_flock_lock() will recurse,
574 * but only once because 'intention' won't be
575 * LDLM_PROCESS_ENQUEUE from ldlm_reprocess_queue. */
576 if ((mode == LCK_NL) && overlaps) {
577 struct list_head rpc_list;
580 INIT_LIST_HEAD(&rpc_list);
582 ldlm_reprocess_queue(res, &res->lr_waiting,
584 LDLM_PROCESS_RESCAN);
586 unlock_res_and_lock(req);
587 rc = ldlm_run_ast_work(ns, &rpc_list,
589 lock_res_and_lock(req);
594 LASSERT(req->l_completion_ast);
595 ldlm_add_ast_work_item(req, NULL, grant_work);
597 #else /* !HAVE_SERVER_SUPPORT */
598 /* The only one possible case for client-side calls flock
599 * policy function is ldlm_flock_completion_ast inside which
600 * carries LDLM_FL_WAIT_NOREPROC flag. */
601 CERROR("Illegal parameter for client-side-only module.\n");
603 #endif /* HAVE_SERVER_SUPPORT */
606 /* In case we're reprocessing the requested lock we can't destroy
607 * it until after calling ldlm_add_ast_work_item() above so that laawi()
608 * can bump the reference count on \a req. Otherwise \a req
609 * could be freed before the completion AST can be sent. */
611 ldlm_flock_destroy(req, mode, *flags);
613 ldlm_resource_dump(D_INFO, res);
614 RETURN(LDLM_ITER_CONTINUE);
617 struct ldlm_flock_wait_data {
618 struct ldlm_lock *fwd_lock;
623 ldlm_flock_interrupted_wait(void *data)
625 struct ldlm_lock *lock;
628 lock = ((struct ldlm_flock_wait_data *)data)->fwd_lock;
630 /* take lock off the deadlock detection hash list. */
631 lock_res_and_lock(lock);
632 ldlm_flock_blocking_unlink(lock);
634 /* client side - set flag to prevent lock from being put on LRU list */
635 ldlm_set_cbpending(lock);
636 unlock_res_and_lock(lock);
642 * Flock completion callback function.
644 * \param lock [in,out]: A lock to be handled
645 * \param flags [in]: flags
646 * \param *data [in]: ldlm_work_cp_ast_lock() will use ldlm_cb_set_arg
648 * \retval 0 : success
649 * \retval <0 : failure
652 ldlm_flock_completion_ast(struct ldlm_lock *lock, __u64 flags, void *data)
654 struct file_lock *getlk = lock->l_ast_data;
655 struct obd_device *obd;
656 struct obd_import *imp = NULL;
657 struct ldlm_flock_wait_data fwd;
658 struct l_wait_info lwi;
663 OBD_FAIL_TIMEOUT(OBD_FAIL_LDLM_CP_CB_WAIT2, 4);
664 if (OBD_FAIL_PRECHECK(OBD_FAIL_LDLM_CP_CB_WAIT3)) {
665 lock_res_and_lock(lock);
666 lock->l_flags |= LDLM_FL_FAIL_LOC;
667 unlock_res_and_lock(lock);
668 OBD_FAIL_TIMEOUT(OBD_FAIL_LDLM_CP_CB_WAIT3, 4);
670 CDEBUG(D_DLMTRACE, "flags: %#llx data: %p getlk: %p\n",
673 LASSERT(flags != LDLM_FL_WAIT_NOREPROC);
675 if (flags & LDLM_FL_FAILED)
678 if (!(flags & LDLM_FL_BLOCKED_MASK)) {
680 /* mds granted the lock in the reply */
682 /* CP AST RPC: lock get granted, wake it up */
683 wake_up(&lock->l_waitq);
687 LDLM_DEBUG(lock, "client-side enqueue returned a blocked lock, "
690 obd = class_exp2obd(lock->l_conn_export);
692 /* if this is a local lock, there is no import */
694 imp = obd->u.cli.cl_import;
697 spin_lock(&imp->imp_lock);
698 fwd.fwd_generation = imp->imp_generation;
699 spin_unlock(&imp->imp_lock);
702 lwi = LWI_TIMEOUT_INTR(0, NULL, ldlm_flock_interrupted_wait, &fwd);
704 /* Go to sleep until the lock is granted. */
705 rc = l_wait_event(lock->l_waitq, is_granted_or_cancelled(lock), &lwi);
708 LDLM_DEBUG(lock, "client-side enqueue waking up: failed (%d)",
714 OBD_FAIL_TIMEOUT(OBD_FAIL_LDLM_CP_CB_WAIT, 10);
716 if (OBD_FAIL_PRECHECK(OBD_FAIL_LDLM_CP_CB_WAIT4)) {
717 lock_res_and_lock(lock);
718 /* DEADLOCK is always set with CBPENDING */
719 lock->l_flags |= LDLM_FL_FLOCK_DEADLOCK | LDLM_FL_CBPENDING;
720 unlock_res_and_lock(lock);
721 OBD_FAIL_TIMEOUT(OBD_FAIL_LDLM_CP_CB_WAIT4, 4);
723 if (OBD_FAIL_PRECHECK(OBD_FAIL_LDLM_CP_CB_WAIT5)) {
724 lock_res_and_lock(lock);
725 /* DEADLOCK is always set with CBPENDING */
726 lock->l_flags |= LDLM_FL_FAIL_LOC |
727 LDLM_FL_FLOCK_DEADLOCK | LDLM_FL_CBPENDING;
728 unlock_res_and_lock(lock);
729 OBD_FAIL_TIMEOUT(OBD_FAIL_LDLM_CP_CB_WAIT5, 4);
732 lock_res_and_lock(lock);
735 /* Protect against race where lock could have been just destroyed
736 * due to overlap in ldlm_process_flock_lock().
738 if (ldlm_is_destroyed(lock)) {
739 unlock_res_and_lock(lock);
740 LDLM_DEBUG(lock, "client-side enqueue waking up: destroyed");
742 /* An error is still to be returned, to propagate it up to
743 * ldlm_cli_enqueue_fini() caller. */
747 /* ldlm_lock_enqueue() has already placed lock on the granted list. */
748 ldlm_resource_unlink_lock(lock);
750 /* Import invalidation. We need to actually release the lock
751 * references being held, so that it can go away. No point in
752 * holding the lock even if app still believes it has it, since
753 * server already dropped it anyway. Only for granted locks too. */
754 /* Do the same for DEADLOCK'ed locks. */
755 if (ldlm_is_failed(lock) || ldlm_is_flock_deadlock(lock)) {
758 if (flags & LDLM_FL_TEST_LOCK)
759 LASSERT(ldlm_is_test_lock(lock));
761 if (ldlm_is_test_lock(lock) || ldlm_is_flock_deadlock(lock))
762 mode = getlk->fl_type;
764 mode = lock->l_granted_mode;
766 if (ldlm_is_flock_deadlock(lock)) {
767 LDLM_DEBUG(lock, "client-side enqueue deadlock "
771 ldlm_flock_destroy(lock, mode, LDLM_FL_WAIT_NOREPROC);
772 unlock_res_and_lock(lock);
774 /* Need to wake up the waiter if we were evicted */
775 wake_up(&lock->l_waitq);
777 /* An error is still to be returned, to propagate it up to
778 * ldlm_cli_enqueue_fini() caller. */
782 LDLM_DEBUG(lock, "client-side enqueue granted");
784 if (flags & LDLM_FL_TEST_LOCK) {
786 * fcntl(F_GETLK) request
787 * The old mode was saved in getlk->fl_type so that if the mode
788 * in the lock changes we can decref the appropriate refcount.
790 LASSERT(ldlm_is_test_lock(lock));
791 ldlm_flock_destroy(lock, getlk->fl_type, LDLM_FL_WAIT_NOREPROC);
792 switch (lock->l_granted_mode) {
794 getlk->fl_type = F_RDLCK;
797 getlk->fl_type = F_WRLCK;
800 getlk->fl_type = F_UNLCK;
802 getlk->fl_pid = (pid_t)lock->l_policy_data.l_flock.pid;
803 getlk->fl_start = (loff_t)lock->l_policy_data.l_flock.start;
804 getlk->fl_end = (loff_t)lock->l_policy_data.l_flock.end;
806 __u64 noreproc = LDLM_FL_WAIT_NOREPROC;
808 /* We need to reprocess the lock to do merges or splits
809 * with existing locks owned by this process. */
810 ldlm_process_flock_lock(lock, &noreproc, 1, &err, NULL);
812 unlock_res_and_lock(lock);
815 EXPORT_SYMBOL(ldlm_flock_completion_ast);
817 int ldlm_flock_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
818 void *data, int flag)
823 LASSERT(flag == LDLM_CB_CANCELING);
825 /* take lock off the deadlock detection hash list. */
826 lock_res_and_lock(lock);
827 ldlm_flock_blocking_unlink(lock);
828 unlock_res_and_lock(lock);
832 void ldlm_flock_policy_wire_to_local(const union ldlm_wire_policy_data *wpolicy,
833 union ldlm_policy_data *lpolicy)
835 lpolicy->l_flock.start = wpolicy->l_flock.lfw_start;
836 lpolicy->l_flock.end = wpolicy->l_flock.lfw_end;
837 lpolicy->l_flock.pid = wpolicy->l_flock.lfw_pid;
838 lpolicy->l_flock.owner = wpolicy->l_flock.lfw_owner;
841 void ldlm_flock_policy_local_to_wire(const union ldlm_policy_data *lpolicy,
842 union ldlm_wire_policy_data *wpolicy)
844 memset(wpolicy, 0, sizeof(*wpolicy));
845 wpolicy->l_flock.lfw_start = lpolicy->l_flock.start;
846 wpolicy->l_flock.lfw_end = lpolicy->l_flock.end;
847 wpolicy->l_flock.lfw_pid = lpolicy->l_flock.pid;
848 wpolicy->l_flock.lfw_owner = lpolicy->l_flock.owner;
852 * Export handle<->flock hash operations.
855 ldlm_export_flock_hash(struct cfs_hash *hs, const void *key, unsigned mask)
857 return cfs_hash_u64_hash(*(__u64 *)key, mask);
861 ldlm_export_flock_key(struct hlist_node *hnode)
863 struct ldlm_lock *lock;
865 lock = hlist_entry(hnode, struct ldlm_lock, l_exp_flock_hash);
866 return &lock->l_policy_data.l_flock.owner;
870 ldlm_export_flock_keycmp(const void *key, struct hlist_node *hnode)
872 return !memcmp(ldlm_export_flock_key(hnode), key, sizeof(__u64));
876 ldlm_export_flock_object(struct hlist_node *hnode)
878 return hlist_entry(hnode, struct ldlm_lock, l_exp_flock_hash);
882 ldlm_export_flock_get(struct cfs_hash *hs, struct hlist_node *hnode)
884 struct ldlm_lock *lock;
885 struct ldlm_flock *flock;
887 lock = hlist_entry(hnode, struct ldlm_lock, l_exp_flock_hash);
890 flock = &lock->l_policy_data.l_flock;
891 LASSERT(flock->blocking_export != NULL);
892 class_export_get(flock->blocking_export);
893 atomic_inc(&flock->blocking_refs);
897 ldlm_export_flock_put(struct cfs_hash *hs, struct hlist_node *hnode)
899 struct ldlm_lock *lock;
900 struct ldlm_flock *flock;
902 lock = hlist_entry(hnode, struct ldlm_lock, l_exp_flock_hash);
904 flock = &lock->l_policy_data.l_flock;
905 LASSERT(flock->blocking_export != NULL);
906 class_export_put(flock->blocking_export);
907 if (atomic_dec_and_test(&flock->blocking_refs)) {
908 flock->blocking_owner = 0;
909 flock->blocking_export = NULL;
911 LDLM_LOCK_RELEASE(lock);
914 static struct cfs_hash_ops ldlm_export_flock_ops = {
915 .hs_hash = ldlm_export_flock_hash,
916 .hs_key = ldlm_export_flock_key,
917 .hs_keycmp = ldlm_export_flock_keycmp,
918 .hs_object = ldlm_export_flock_object,
919 .hs_get = ldlm_export_flock_get,
920 .hs_put = ldlm_export_flock_put,
921 .hs_put_locked = ldlm_export_flock_put,
924 int ldlm_init_flock_export(struct obd_export *exp)
926 if( strcmp(exp->exp_obd->obd_type->typ_name, LUSTRE_MDT_NAME) != 0)
929 exp->exp_flock_hash =
930 cfs_hash_create(obd_uuid2str(&exp->exp_client_uuid),
931 HASH_EXP_LOCK_CUR_BITS,
932 HASH_EXP_LOCK_MAX_BITS,
933 HASH_EXP_LOCK_BKT_BITS, 0,
934 CFS_HASH_MIN_THETA, CFS_HASH_MAX_THETA,
935 &ldlm_export_flock_ops,
936 CFS_HASH_DEFAULT | CFS_HASH_NBLK_CHANGE);
937 if (!exp->exp_flock_hash)
943 void ldlm_destroy_flock_export(struct obd_export *exp)
946 if (exp->exp_flock_hash) {
947 cfs_hash_putref(exp->exp_flock_hash);
948 exp->exp_flock_hash = NULL;