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.sun.com/software/products/lustre/docs/GPLv2.pdf
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21 * CA 95054 USA or visit www.sun.com if you need additional information or
27 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
30 * Copyright (c) 2011, 2012, Intel Corporation.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
36 * Implementation of cl_lock for OSC layer.
38 * Author: Nikita Danilov <nikita.danilov@sun.com>
41 #define DEBUG_SUBSYSTEM S_OSC
43 # include <linux/libcfs/libcfs.h>
44 /* fid_build_reg_res_name() */
45 #include <lustre_fid.h>
47 #include "osc_cl_internal.h"
53 #define _PAGEREF_MAGIC (-10000000)
55 /*****************************************************************************
61 static const struct cl_lock_operations osc_lock_ops;
62 static const struct cl_lock_operations osc_lock_lockless_ops;
63 static void osc_lock_to_lockless(const struct lu_env *env,
64 struct osc_lock *ols, int force);
65 static int osc_lock_has_pages(struct osc_lock *olck);
67 int osc_lock_is_lockless(const struct osc_lock *olck)
69 return (olck->ols_cl.cls_ops == &osc_lock_lockless_ops);
73 * Returns a weak pointer to the ldlm lock identified by a handle. Returned
74 * pointer cannot be dereferenced, as lock is not protected from concurrent
75 * reclaim. This function is a helper for osc_lock_invariant().
77 static struct ldlm_lock *osc_handle_ptr(struct lustre_handle *handle)
79 struct ldlm_lock *lock;
81 lock = ldlm_handle2lock(handle);
88 * Invariant that has to be true all of the time.
90 static int osc_lock_invariant(struct osc_lock *ols)
92 struct ldlm_lock *lock = osc_handle_ptr(&ols->ols_handle);
93 struct ldlm_lock *olock = ols->ols_lock;
94 int handle_used = lustre_handle_is_used(&ols->ols_handle);
96 if (ergo(osc_lock_is_lockless(ols),
97 ols->ols_locklessable && ols->ols_lock == NULL))
101 * If all the following "ergo"s are true, return 1, otherwise 0
103 if (! ergo(olock != NULL, handle_used))
106 if (! ergo(olock != NULL,
107 olock->l_handle.h_cookie == ols->ols_handle.cookie))
110 if (! ergo(handle_used,
111 ergo(lock != NULL && olock != NULL, lock == olock) &&
112 ergo(lock == NULL, olock == NULL)))
115 * Check that ->ols_handle and ->ols_lock are consistent, but
116 * take into account that they are set at the different time.
118 if (! ergo(ols->ols_state == OLS_CANCELLED,
119 olock == NULL && !handle_used))
122 * DLM lock is destroyed only after we have seen cancellation
125 if (! ergo(olock != NULL && ols->ols_state < OLS_CANCELLED,
126 ((olock->l_flags & LDLM_FL_DESTROYED) == 0)))
129 if (! ergo(ols->ols_state == OLS_GRANTED,
131 olock->l_req_mode == olock->l_granted_mode &&
137 /*****************************************************************************
144 * Breaks a link between osc_lock and dlm_lock.
146 static void osc_lock_detach(const struct lu_env *env, struct osc_lock *olck)
148 struct ldlm_lock *dlmlock;
150 spin_lock(&osc_ast_guard);
151 dlmlock = olck->ols_lock;
152 if (dlmlock == NULL) {
153 spin_unlock(&osc_ast_guard);
157 olck->ols_lock = NULL;
158 /* wb(); --- for all who checks (ols->ols_lock != NULL) before
159 * call to osc_lock_detach() */
160 dlmlock->l_ast_data = NULL;
161 olck->ols_handle.cookie = 0ULL;
162 spin_unlock(&osc_ast_guard);
164 lock_res_and_lock(dlmlock);
165 if (dlmlock->l_granted_mode == dlmlock->l_req_mode) {
166 struct cl_object *obj = olck->ols_cl.cls_obj;
167 struct cl_attr *attr = &osc_env_info(env)->oti_attr;
170 cl_object_attr_lock(obj);
171 /* Must get the value under the lock to avoid possible races. */
172 old_kms = cl2osc(obj)->oo_oinfo->loi_kms;
173 /* Update the kms. Need to loop all granted locks.
174 * Not a problem for the client */
175 attr->cat_kms = ldlm_extent_shift_kms(dlmlock, old_kms);
177 cl_object_attr_set(env, obj, attr, CAT_KMS);
178 cl_object_attr_unlock(obj);
180 unlock_res_and_lock(dlmlock);
182 /* release a reference taken in osc_lock_upcall0(). */
183 LASSERT(olck->ols_has_ref);
184 lu_ref_del(&dlmlock->l_reference, "osc_lock", olck);
185 LDLM_LOCK_RELEASE(dlmlock);
186 olck->ols_has_ref = 0;
189 static int osc_lock_unhold(struct osc_lock *ols)
195 result = osc_cancel_base(&ols->ols_handle,
196 ols->ols_einfo.ei_mode);
201 static int osc_lock_unuse(const struct lu_env *env,
202 const struct cl_lock_slice *slice)
204 struct osc_lock *ols = cl2osc_lock(slice);
206 LINVRNT(osc_lock_invariant(ols));
208 switch (ols->ols_state) {
210 LASSERT(!ols->ols_hold);
211 LASSERT(ols->ols_agl);
213 case OLS_UPCALL_RECEIVED:
214 osc_lock_unhold(ols);
216 LASSERT(!ols->ols_hold);
217 osc_lock_detach(env, ols);
218 ols->ols_state = OLS_NEW;
221 LASSERT(!ols->ols_glimpse);
222 LASSERT(ols->ols_hold);
224 * Move lock into OLS_RELEASED state before calling
225 * osc_cancel_base() so that possible synchronous cancellation
226 * (that always happens e.g., for liblustre) sees that lock is
229 ols->ols_state = OLS_RELEASED;
230 return osc_lock_unhold(ols);
232 CERROR("Impossible state: %d\n", ols->ols_state);
237 static void osc_lock_fini(const struct lu_env *env,
238 struct cl_lock_slice *slice)
240 struct osc_lock *ols = cl2osc_lock(slice);
242 LINVRNT(osc_lock_invariant(ols));
244 * ->ols_hold can still be true at this point if, for example, a
245 * thread that requested a lock was killed (and released a reference
246 * to the lock), before reply from a server was received. In this case
247 * lock is destroyed immediately after upcall.
249 osc_lock_unhold(ols);
250 LASSERT(ols->ols_lock == NULL);
251 LASSERT(atomic_read(&ols->ols_pageref) == 0 ||
252 atomic_read(&ols->ols_pageref) == _PAGEREF_MAGIC);
254 OBD_SLAB_FREE_PTR(ols, osc_lock_kmem);
257 static void osc_lock_build_policy(const struct lu_env *env,
258 const struct cl_lock *lock,
259 ldlm_policy_data_t *policy)
261 const struct cl_lock_descr *d = &lock->cll_descr;
263 osc_index2policy(policy, d->cld_obj, d->cld_start, d->cld_end);
264 policy->l_extent.gid = d->cld_gid;
267 static __u64 osc_enq2ldlm_flags(__u32 enqflags)
271 LASSERT((enqflags & ~CEF_MASK) == 0);
273 if (enqflags & CEF_NONBLOCK)
274 result |= LDLM_FL_BLOCK_NOWAIT;
275 if (enqflags & CEF_ASYNC)
276 result |= LDLM_FL_HAS_INTENT;
277 if (enqflags & CEF_DISCARD_DATA)
278 result |= LDLM_FL_AST_DISCARD_DATA;
283 * Global spin-lock protecting consistency of ldlm_lock::l_ast_data
284 * pointers. Initialized in osc_init().
286 spinlock_t osc_ast_guard;
288 static struct osc_lock *osc_ast_data_get(struct ldlm_lock *dlm_lock)
290 struct osc_lock *olck;
292 lock_res_and_lock(dlm_lock);
293 spin_lock(&osc_ast_guard);
294 olck = dlm_lock->l_ast_data;
296 struct cl_lock *lock = olck->ols_cl.cls_lock;
298 * If osc_lock holds a reference on ldlm lock, return it even
299 * when cl_lock is in CLS_FREEING state. This way
301 * osc_ast_data_get(dlmlock) == NULL
303 * guarantees that all osc references on dlmlock were
304 * released. osc_dlm_blocking_ast0() relies on that.
306 if (lock->cll_state < CLS_FREEING || olck->ols_has_ref) {
307 cl_lock_get_trust(lock);
308 lu_ref_add_atomic(&lock->cll_reference,
313 spin_unlock(&osc_ast_guard);
314 unlock_res_and_lock(dlm_lock);
318 static void osc_ast_data_put(const struct lu_env *env, struct osc_lock *olck)
320 struct cl_lock *lock;
322 lock = olck->ols_cl.cls_lock;
323 lu_ref_del(&lock->cll_reference, "ast", current);
324 cl_lock_put(env, lock);
328 * Updates object attributes from a lock value block (lvb) received together
329 * with the DLM lock reply from the server. Copy of osc_update_enqueue()
332 * This can be optimized to not update attributes when lock is a result of a
335 * Called under lock and resource spin-locks.
337 static void osc_lock_lvb_update(const struct lu_env *env, struct osc_lock *olck,
341 struct cl_object *obj;
342 struct lov_oinfo *oinfo;
343 struct cl_attr *attr;
346 if (!(olck->ols_flags & LDLM_FL_LVB_READY))
349 lvb = &olck->ols_lvb;
350 obj = olck->ols_cl.cls_obj;
351 oinfo = cl2osc(obj)->oo_oinfo;
352 attr = &osc_env_info(env)->oti_attr;
353 valid = CAT_BLOCKS | CAT_ATIME | CAT_CTIME | CAT_MTIME | CAT_SIZE;
354 cl_lvb2attr(attr, lvb);
356 cl_object_attr_lock(obj);
358 struct ldlm_lock *dlmlock;
361 dlmlock = olck->ols_lock;
362 LASSERT(dlmlock != NULL);
364 /* re-grab LVB from a dlm lock under DLM spin-locks. */
365 *lvb = *(struct ost_lvb *)dlmlock->l_lvb_data;
366 size = lvb->lvb_size;
367 /* Extend KMS up to the end of this lock and no further
368 * A lock on [x,y] means a KMS of up to y + 1 bytes! */
369 if (size > dlmlock->l_policy_data.l_extent.end)
370 size = dlmlock->l_policy_data.l_extent.end + 1;
371 if (size >= oinfo->loi_kms) {
372 LDLM_DEBUG(dlmlock, "lock acquired, setting rss="LPU64
373 ", kms="LPU64, lvb->lvb_size, size);
375 attr->cat_kms = size;
377 LDLM_DEBUG(dlmlock, "lock acquired, setting rss="
378 LPU64"; leaving kms="LPU64", end="LPU64,
379 lvb->lvb_size, oinfo->loi_kms,
380 dlmlock->l_policy_data.l_extent.end);
382 ldlm_lock_allow_match_locked(dlmlock);
383 } else if (rc == -ENAVAIL && olck->ols_glimpse) {
384 CDEBUG(D_INODE, "glimpsed, setting rss="LPU64"; leaving"
385 " kms="LPU64"\n", lvb->lvb_size, oinfo->loi_kms);
390 cl_object_attr_set(env, obj, attr, valid);
392 cl_object_attr_unlock(obj);
396 * Called when a lock is granted, from an upcall (when server returned a
397 * granted lock), or from completion AST, when server returned a blocked lock.
399 * Called under lock and resource spin-locks, that are released temporarily
402 static void osc_lock_granted(const struct lu_env *env, struct osc_lock *olck,
403 struct ldlm_lock *dlmlock, int rc)
405 struct ldlm_extent *ext;
406 struct cl_lock *lock;
407 struct cl_lock_descr *descr;
409 LASSERT(dlmlock->l_granted_mode == dlmlock->l_req_mode);
411 if (olck->ols_state < OLS_GRANTED) {
412 lock = olck->ols_cl.cls_lock;
413 ext = &dlmlock->l_policy_data.l_extent;
414 descr = &osc_env_info(env)->oti_descr;
415 descr->cld_obj = lock->cll_descr.cld_obj;
417 /* XXX check that ->l_granted_mode is valid. */
418 descr->cld_mode = osc_ldlm2cl_lock(dlmlock->l_granted_mode);
419 descr->cld_start = cl_index(descr->cld_obj, ext->start);
420 descr->cld_end = cl_index(descr->cld_obj, ext->end);
421 descr->cld_gid = ext->gid;
423 * tell upper layers the extent of the lock that was actually
426 olck->ols_state = OLS_GRANTED;
427 osc_lock_lvb_update(env, olck, rc);
429 /* release DLM spin-locks to allow cl_lock_{modify,signal}()
430 * to take a semaphore on a parent lock. This is safe, because
431 * spin-locks are needed to protect consistency of
432 * dlmlock->l_*_mode and LVB, and we have finished processing
434 unlock_res_and_lock(dlmlock);
435 cl_lock_modify(env, lock, descr);
436 cl_lock_signal(env, lock);
437 LINVRNT(osc_lock_invariant(olck));
438 lock_res_and_lock(dlmlock);
442 static void osc_lock_upcall0(const struct lu_env *env, struct osc_lock *olck)
445 struct ldlm_lock *dlmlock;
447 dlmlock = ldlm_handle2lock_long(&olck->ols_handle, 0);
448 LASSERT(dlmlock != NULL);
450 lock_res_and_lock(dlmlock);
451 spin_lock(&osc_ast_guard);
452 LASSERT(dlmlock->l_ast_data == olck);
453 LASSERT(olck->ols_lock == NULL);
454 olck->ols_lock = dlmlock;
455 spin_unlock(&osc_ast_guard);
458 * Lock might be not yet granted. In this case, completion ast
459 * (osc_ldlm_completion_ast()) comes later and finishes lock
462 if (dlmlock->l_granted_mode == dlmlock->l_req_mode)
463 osc_lock_granted(env, olck, dlmlock, 0);
464 unlock_res_and_lock(dlmlock);
467 * osc_enqueue_interpret() decrefs asynchronous locks, counter
470 ldlm_lock_addref(&olck->ols_handle, olck->ols_einfo.ei_mode);
473 /* lock reference taken by ldlm_handle2lock_long() is owned by
474 * osc_lock and released in osc_lock_detach() */
475 lu_ref_add(&dlmlock->l_reference, "osc_lock", olck);
476 olck->ols_has_ref = 1;
480 * Lock upcall function that is executed either when a reply to ENQUEUE rpc is
481 * received from a server, or after osc_enqueue_base() matched a local DLM
484 static int osc_lock_upcall(void *cookie, int errcode)
486 struct osc_lock *olck = cookie;
487 struct cl_lock_slice *slice = &olck->ols_cl;
488 struct cl_lock *lock = slice->cls_lock;
490 struct cl_env_nest nest;
492 env = cl_env_nested_get(&nest);
496 cl_lock_mutex_get(env, lock);
498 LASSERT(lock->cll_state >= CLS_QUEUING);
499 if (olck->ols_state == OLS_ENQUEUED) {
500 olck->ols_state = OLS_UPCALL_RECEIVED;
501 rc = ldlm_error2errno(errcode);
502 } else if (olck->ols_state == OLS_CANCELLED) {
505 CERROR("Impossible state: %d\n", olck->ols_state);
509 struct ldlm_lock *dlmlock;
511 dlmlock = ldlm_handle2lock(&olck->ols_handle);
512 if (dlmlock != NULL) {
513 lock_res_and_lock(dlmlock);
514 spin_lock(&osc_ast_guard);
515 LASSERT(olck->ols_lock == NULL);
516 dlmlock->l_ast_data = NULL;
517 olck->ols_handle.cookie = 0ULL;
518 spin_unlock(&osc_ast_guard);
519 ldlm_lock_fail_match_locked(dlmlock);
520 unlock_res_and_lock(dlmlock);
521 LDLM_LOCK_PUT(dlmlock);
524 if (olck->ols_glimpse)
525 olck->ols_glimpse = 0;
526 osc_lock_upcall0(env, olck);
529 /* Error handling, some errors are tolerable. */
530 if (olck->ols_locklessable && rc == -EUSERS) {
531 /* This is a tolerable error, turn this lock into
534 osc_object_set_contended(cl2osc(slice->cls_obj));
535 LASSERT(slice->cls_ops == &osc_lock_ops);
537 /* Change this lock to ldlmlock-less lock. */
538 osc_lock_to_lockless(env, olck, 1);
539 olck->ols_state = OLS_GRANTED;
541 } else if (olck->ols_glimpse && rc == -ENAVAIL) {
542 osc_lock_lvb_update(env, olck, rc);
543 cl_lock_delete(env, lock);
544 /* Hide the error. */
549 /* For AGL case, the RPC sponsor may exits the cl_lock
550 * processing without wait() called before related OSC
551 * lock upcall(). So update the lock status according
552 * to the enqueue result inside AGL upcall(). */
554 lock->cll_flags |= CLF_FROM_UPCALL;
555 cl_wait_try(env, lock);
556 lock->cll_flags &= ~CLF_FROM_UPCALL;
557 if (!olck->ols_glimpse)
560 cl_lock_signal(env, lock);
561 /* del user for lock upcall cookie */
562 cl_unuse_try(env, lock);
564 /* del user for lock upcall cookie */
565 cl_lock_user_del(env, lock);
566 cl_lock_error(env, lock, rc);
569 /* release cookie reference, acquired by osc_lock_enqueue() */
570 cl_lock_hold_release(env, lock, "upcall", lock);
571 cl_lock_mutex_put(env, lock);
573 lu_ref_del(&lock->cll_reference, "upcall", lock);
574 /* This maybe the last reference, so must be called after
575 * cl_lock_mutex_put(). */
576 cl_lock_put(env, lock);
578 cl_env_nested_put(&nest, env);
580 /* should never happen, similar to osc_ldlm_blocking_ast(). */
587 * Core of osc_dlm_blocking_ast() logic.
589 static void osc_lock_blocking(const struct lu_env *env,
590 struct ldlm_lock *dlmlock,
591 struct osc_lock *olck, int blocking)
593 struct cl_lock *lock = olck->ols_cl.cls_lock;
595 LASSERT(olck->ols_lock == dlmlock);
596 CLASSERT(OLS_BLOCKED < OLS_CANCELLED);
597 LASSERT(!osc_lock_is_lockless(olck));
600 * Lock might be still addref-ed here, if e.g., blocking ast
601 * is sent for a failed lock.
603 osc_lock_unhold(olck);
605 if (blocking && olck->ols_state < OLS_BLOCKED)
607 * Move osc_lock into OLS_BLOCKED before canceling the lock,
608 * because it recursively re-enters osc_lock_blocking(), with
609 * the state set to OLS_CANCELLED.
611 olck->ols_state = OLS_BLOCKED;
613 * cancel and destroy lock at least once no matter how blocking ast is
614 * entered (see comment above osc_ldlm_blocking_ast() for use
615 * cases). cl_lock_cancel() and cl_lock_delete() are idempotent.
617 cl_lock_cancel(env, lock);
618 cl_lock_delete(env, lock);
622 * Helper for osc_dlm_blocking_ast() handling discrepancies between cl_lock
623 * and ldlm_lock caches.
625 static int osc_dlm_blocking_ast0(const struct lu_env *env,
626 struct ldlm_lock *dlmlock,
627 void *data, int flag)
629 struct osc_lock *olck;
630 struct cl_lock *lock;
634 LASSERT(flag == LDLM_CB_BLOCKING || flag == LDLM_CB_CANCELING);
637 olck = osc_ast_data_get(dlmlock);
639 lock = olck->ols_cl.cls_lock;
640 cl_lock_mutex_get(env, lock);
641 LINVRNT(osc_lock_invariant(olck));
642 if (olck->ols_ast_wait) {
643 /* wake up osc_lock_use() */
644 cl_lock_signal(env, lock);
645 olck->ols_ast_wait = 0;
648 * Lock might have been canceled while this thread was
649 * sleeping for lock mutex, but olck is pinned in memory.
651 if (olck == dlmlock->l_ast_data) {
653 * NOTE: DLM sends blocking AST's for failed locks
654 * (that are still in pre-OLS_GRANTED state)
655 * too, and they have to be canceled otherwise
656 * DLM lock is never destroyed and stuck in
659 * Alternatively, ldlm_cli_cancel() can be
660 * called here directly for osc_locks with
661 * ols_state < OLS_GRANTED to maintain an
662 * invariant that ->clo_cancel() is only called
663 * for locks that were granted.
665 LASSERT(data == olck);
666 osc_lock_blocking(env, dlmlock,
667 olck, flag == LDLM_CB_BLOCKING);
670 cl_lock_mutex_put(env, lock);
671 osc_ast_data_put(env, olck);
674 * DLM lock exists, but there is no cl_lock attached to it.
675 * This is a `normal' race. cl_object and its cl_lock's can be
676 * removed by memory pressure, together with all pages.
678 cancel = (flag == LDLM_CB_BLOCKING);
681 struct lustre_handle *lockh;
683 lockh = &osc_env_info(env)->oti_handle;
684 ldlm_lock2handle(dlmlock, lockh);
685 result = ldlm_cli_cancel(lockh, LCF_ASYNC);
692 * Blocking ast invoked by ldlm when dlm lock is either blocking progress of
693 * some other lock, or is canceled. This function is installed as a
694 * ldlm_lock::l_blocking_ast() for client extent locks.
696 * Control flow is tricky, because ldlm uses the same call-back
697 * (ldlm_lock::l_blocking_ast()) for both blocking and cancellation ast's.
699 * \param dlmlock lock for which ast occurred.
701 * \param new description of a conflicting lock in case of blocking ast.
703 * \param data value of dlmlock->l_ast_data
705 * \param flag LDLM_CB_BLOCKING or LDLM_CB_CANCELING. Used to distinguish
706 * cancellation and blocking ast's.
708 * Possible use cases:
710 * - ldlm calls dlmlock->l_blocking_ast(..., LDLM_CB_CANCELING) to cancel
711 * lock due to lock lru pressure, or explicit user request to purge
714 * - ldlm calls dlmlock->l_blocking_ast(..., LDLM_CB_BLOCKING) to notify
715 * us that dlmlock conflicts with another lock that some client is
716 * enqueing. Lock is canceled.
718 * - cl_lock_cancel() is called. osc_lock_cancel() calls
719 * ldlm_cli_cancel() that calls
721 * dlmlock->l_blocking_ast(..., LDLM_CB_CANCELING)
723 * recursively entering osc_ldlm_blocking_ast().
725 * - client cancels lock voluntary (e.g., as a part of early cancellation):
728 * osc_lock_cancel()->
729 * ldlm_cli_cancel()->
730 * dlmlock->l_blocking_ast(..., LDLM_CB_CANCELING)
733 static int osc_ldlm_blocking_ast(struct ldlm_lock *dlmlock,
734 struct ldlm_lock_desc *new, void *data,
738 struct cl_env_nest nest;
742 * This can be called in the context of outer IO, e.g.,
745 * ->osc_enqueue_base()->...
746 * ->ldlm_prep_elc_req()->...
747 * ->ldlm_cancel_callback()->...
748 * ->osc_ldlm_blocking_ast()
750 * new environment has to be created to not corrupt outer context.
752 env = cl_env_nested_get(&nest);
754 result = osc_dlm_blocking_ast0(env, dlmlock, data, flag);
755 cl_env_nested_put(&nest, env);
757 result = PTR_ERR(env);
759 * XXX This should never happen, as cl_lock is
760 * stuck. Pre-allocated environment a la vvp_inode_fini_env
766 if (result == -ENODATA)
769 CERROR("BAST failed: %d\n", result);
774 static int osc_ldlm_completion_ast(struct ldlm_lock *dlmlock,
775 __u64 flags, void *data)
777 struct cl_env_nest nest;
779 struct osc_lock *olck;
780 struct cl_lock *lock;
784 /* first, do dlm part of the work */
785 dlmrc = ldlm_completion_ast_async(dlmlock, flags, data);
786 /* then, notify cl_lock */
787 env = cl_env_nested_get(&nest);
789 olck = osc_ast_data_get(dlmlock);
791 lock = olck->ols_cl.cls_lock;
792 cl_lock_mutex_get(env, lock);
794 * ldlm_handle_cp_callback() copied LVB from request
795 * to lock->l_lvb_data, store it in osc_lock.
797 LASSERT(dlmlock->l_lvb_data != NULL);
798 lock_res_and_lock(dlmlock);
799 olck->ols_lvb = *(struct ost_lvb *)dlmlock->l_lvb_data;
800 if (olck->ols_lock == NULL) {
802 * upcall (osc_lock_upcall()) hasn't yet been
803 * called. Do nothing now, upcall will bind
804 * olck to dlmlock and signal the waiters.
806 * This maintains an invariant that osc_lock
807 * and ldlm_lock are always bound when
808 * osc_lock is in OLS_GRANTED state.
810 } else if (dlmlock->l_granted_mode ==
811 dlmlock->l_req_mode) {
812 osc_lock_granted(env, olck, dlmlock, dlmrc);
814 unlock_res_and_lock(dlmlock);
817 CL_LOCK_DEBUG(D_ERROR, env, lock,
818 "dlmlock returned %d\n", dlmrc);
819 cl_lock_error(env, lock, dlmrc);
821 cl_lock_mutex_put(env, lock);
822 osc_ast_data_put(env, olck);
825 result = -ELDLM_NO_LOCK_DATA;
826 cl_env_nested_put(&nest, env);
828 result = PTR_ERR(env);
829 return dlmrc ?: result;
832 static int osc_ldlm_glimpse_ast(struct ldlm_lock *dlmlock, void *data)
834 struct ptlrpc_request *req = data;
835 struct osc_lock *olck;
836 struct cl_lock *lock;
837 struct cl_object *obj;
838 struct cl_env_nest nest;
841 struct req_capsule *cap;
844 LASSERT(lustre_msg_get_opc(req->rq_reqmsg) == LDLM_GL_CALLBACK);
846 env = cl_env_nested_get(&nest);
848 /* osc_ast_data_get() has to go after environment is
849 * allocated, because osc_ast_data() acquires a
850 * reference to a lock, and it can only be released in
853 olck = osc_ast_data_get(dlmlock);
855 lock = olck->ols_cl.cls_lock;
856 /* Do not grab the mutex of cl_lock for glimpse.
857 * See LU-1274 for details.
858 * BTW, it's okay for cl_lock to be cancelled during
859 * this period because server can handle this race.
860 * See ldlm_server_glimpse_ast() for details.
861 * cl_lock_mutex_get(env, lock); */
863 req_capsule_extend(cap, &RQF_LDLM_GL_CALLBACK);
864 req_capsule_set_size(cap, &RMF_DLM_LVB, RCL_SERVER,
866 result = req_capsule_server_pack(cap);
868 lvb = req_capsule_server_get(cap, &RMF_DLM_LVB);
869 obj = lock->cll_descr.cld_obj;
870 result = cl_object_glimpse(env, obj, lvb);
872 if (!exp_connect_lvb_type(req->rq_export))
873 req_capsule_shrink(&req->rq_pill,
875 sizeof(struct ost_lvb_v1),
877 osc_ast_data_put(env, olck);
880 * These errors are normal races, so we don't want to
881 * fill the console with messages by calling
884 lustre_pack_reply(req, 1, NULL, NULL);
885 result = -ELDLM_NO_LOCK_DATA;
887 cl_env_nested_put(&nest, env);
889 result = PTR_ERR(env);
890 req->rq_status = result;
894 static unsigned long osc_lock_weigh(const struct lu_env *env,
895 const struct cl_lock_slice *slice)
898 * don't need to grab coh_page_guard since we don't care the exact #
901 return cl_object_header(slice->cls_obj)->coh_pages;
904 static void osc_lock_build_einfo(const struct lu_env *env,
905 const struct cl_lock *clock,
906 struct osc_lock *lock,
907 struct ldlm_enqueue_info *einfo)
909 enum cl_lock_mode mode;
911 mode = clock->cll_descr.cld_mode;
912 if (mode == CLM_PHANTOM)
914 * For now, enqueue all glimpse locks in read mode. In the
915 * future, client might choose to enqueue LCK_PW lock for
916 * glimpse on a file opened for write.
920 einfo->ei_type = LDLM_EXTENT;
921 einfo->ei_mode = osc_cl_lock2ldlm(mode);
922 einfo->ei_cb_bl = osc_ldlm_blocking_ast;
923 einfo->ei_cb_cp = osc_ldlm_completion_ast;
924 einfo->ei_cb_gl = osc_ldlm_glimpse_ast;
925 einfo->ei_cbdata = lock; /* value to be put into ->l_ast_data */
929 * Determine if the lock should be converted into a lockless lock.
932 * - if the lock has an explicite requirment for a non-lockless lock;
933 * - if the io lock request type ci_lockreq;
934 * - send the enqueue rpc to ost to make the further decision;
935 * - special treat to truncate lockless lock
937 * Additional policy can be implemented here, e.g., never do lockless-io
940 static void osc_lock_to_lockless(const struct lu_env *env,
941 struct osc_lock *ols, int force)
943 struct cl_lock_slice *slice = &ols->ols_cl;
945 LASSERT(ols->ols_state == OLS_NEW ||
946 ols->ols_state == OLS_UPCALL_RECEIVED);
949 ols->ols_locklessable = 1;
950 slice->cls_ops = &osc_lock_lockless_ops;
952 struct osc_io *oio = osc_env_io(env);
953 struct cl_io *io = oio->oi_cl.cis_io;
954 struct cl_object *obj = slice->cls_obj;
955 struct osc_object *oob = cl2osc(obj);
956 const struct osc_device *osd = lu2osc_dev(obj->co_lu.lo_dev);
957 struct obd_connect_data *ocd;
959 LASSERT(io->ci_lockreq == CILR_MANDATORY ||
960 io->ci_lockreq == CILR_MAYBE ||
961 io->ci_lockreq == CILR_NEVER);
963 ocd = &class_exp2cliimp(osc_export(oob))->imp_connect_data;
964 ols->ols_locklessable = (io->ci_type != CIT_SETATTR) &&
965 (io->ci_lockreq == CILR_MAYBE) &&
966 (ocd->ocd_connect_flags & OBD_CONNECT_SRVLOCK);
967 if (io->ci_lockreq == CILR_NEVER ||
969 (ols->ols_locklessable && osc_object_is_contended(oob)) ||
970 /* lockless truncate */
971 (cl_io_is_trunc(io) &&
972 (ocd->ocd_connect_flags & OBD_CONNECT_TRUNCLOCK) &&
973 osd->od_lockless_truncate)) {
974 ols->ols_locklessable = 1;
975 slice->cls_ops = &osc_lock_lockless_ops;
978 LASSERT(ergo(ols->ols_glimpse, !osc_lock_is_lockless(ols)));
981 static int osc_lock_compatible(const struct osc_lock *qing,
982 const struct osc_lock *qed)
984 enum cl_lock_mode qing_mode;
985 enum cl_lock_mode qed_mode;
987 qing_mode = qing->ols_cl.cls_lock->cll_descr.cld_mode;
988 if (qed->ols_glimpse &&
989 (qed->ols_state >= OLS_UPCALL_RECEIVED || qing_mode == CLM_READ))
992 qed_mode = qed->ols_cl.cls_lock->cll_descr.cld_mode;
993 return ((qing_mode == CLM_READ) && (qed_mode == CLM_READ));
997 * Cancel all conflicting locks and wait for them to be destroyed.
999 * This function is used for two purposes:
1001 * - early cancel all conflicting locks before starting IO, and
1003 * - guarantee that pages added to the page cache by lockless IO are never
1004 * covered by locks other than lockless IO lock, and, hence, are not
1005 * visible to other threads.
1007 static int osc_lock_enqueue_wait(const struct lu_env *env,
1008 const struct osc_lock *olck)
1010 struct cl_lock *lock = olck->ols_cl.cls_lock;
1011 struct cl_lock_descr *descr = &lock->cll_descr;
1012 struct cl_object_header *hdr = cl_object_header(descr->cld_obj);
1013 struct cl_lock *scan;
1014 struct cl_lock *conflict= NULL;
1015 int lockless = osc_lock_is_lockless(olck);
1018 LASSERT(cl_lock_is_mutexed(lock));
1020 /* make it enqueue anyway for glimpse lock, because we actually
1021 * don't need to cancel any conflicting locks. */
1022 if (olck->ols_glimpse)
1025 spin_lock(&hdr->coh_lock_guard);
1026 list_for_each_entry(scan, &hdr->coh_locks, cll_linkage) {
1027 struct cl_lock_descr *cld = &scan->cll_descr;
1028 const struct osc_lock *scan_ols;
1033 if (scan->cll_state < CLS_QUEUING ||
1034 scan->cll_state == CLS_FREEING ||
1035 cld->cld_start > descr->cld_end ||
1036 cld->cld_end < descr->cld_start)
1039 /* overlapped and living locks. */
1041 /* We're not supposed to give up group lock. */
1042 if (scan->cll_descr.cld_mode == CLM_GROUP) {
1043 LASSERT(descr->cld_mode != CLM_GROUP ||
1044 descr->cld_gid != scan->cll_descr.cld_gid);
1048 scan_ols = osc_lock_at(scan);
1050 /* We need to cancel the compatible locks if we're enqueuing
1051 * a lockless lock, for example:
1052 * imagine that client has PR lock on [0, 1000], and thread T0
1053 * is doing lockless IO in [500, 1500] region. Concurrent
1054 * thread T1 can see lockless data in [500, 1000], which is
1055 * wrong, because these data are possibly stale. */
1056 if (!lockless && osc_lock_compatible(olck, scan_ols))
1059 cl_lock_get_trust(scan);
1063 spin_unlock(&hdr->coh_lock_guard);
1066 if (lock->cll_descr.cld_mode == CLM_GROUP) {
1067 /* we want a group lock but a previous lock request
1068 * conflicts, we do not wait but return 0 so the
1069 * request is send to the server
1071 CDEBUG(D_DLMTRACE, "group lock %p is conflicted "
1072 "with %p, no wait, send to server\n",
1074 cl_lock_put(env, conflict);
1077 CDEBUG(D_DLMTRACE, "lock %p is conflicted with %p, "
1080 LASSERT(lock->cll_conflict == NULL);
1081 lu_ref_add(&conflict->cll_reference, "cancel-wait",
1083 lock->cll_conflict = conflict;
1091 * Implementation of cl_lock_operations::clo_enqueue() method for osc
1092 * layer. This initiates ldlm enqueue:
1094 * - cancels conflicting locks early (osc_lock_enqueue_wait());
1096 * - calls osc_enqueue_base() to do actual enqueue.
1098 * osc_enqueue_base() is supplied with an upcall function that is executed
1099 * when lock is received either after a local cached ldlm lock is matched, or
1100 * when a reply from the server is received.
1102 * This function does not wait for the network communication to complete.
1104 static int osc_lock_enqueue(const struct lu_env *env,
1105 const struct cl_lock_slice *slice,
1106 struct cl_io *unused, __u32 enqflags)
1108 struct osc_lock *ols = cl2osc_lock(slice);
1109 struct cl_lock *lock = ols->ols_cl.cls_lock;
1112 LASSERT(cl_lock_is_mutexed(lock));
1113 LASSERTF(ols->ols_state == OLS_NEW,
1114 "Impossible state: %d\n", ols->ols_state);
1116 LASSERTF(ergo(ols->ols_glimpse, lock->cll_descr.cld_mode <= CLM_READ),
1117 "lock = %p, ols = %p\n", lock, ols);
1119 result = osc_lock_enqueue_wait(env, ols);
1121 if (!osc_lock_is_lockless(ols)) {
1122 struct osc_object *obj = cl2osc(slice->cls_obj);
1123 struct osc_thread_info *info = osc_env_info(env);
1124 struct ldlm_res_id *resname = &info->oti_resname;
1125 ldlm_policy_data_t *policy = &info->oti_policy;
1126 struct ldlm_enqueue_info *einfo = &ols->ols_einfo;
1128 /* lock will be passed as upcall cookie,
1129 * hold ref to prevent to be released. */
1130 cl_lock_hold_add(env, lock, "upcall", lock);
1131 /* a user for lock also */
1132 cl_lock_user_add(env, lock);
1133 ols->ols_state = OLS_ENQUEUED;
1136 * XXX: this is possible blocking point as
1137 * ldlm_lock_match(LDLM_FL_LVB_READY) waits for
1140 ostid_build_res_name(&obj->oo_oinfo->loi_oi, resname);
1141 osc_lock_build_policy(env, lock, policy);
1142 result = osc_enqueue_base(osc_export(obj), resname,
1143 &ols->ols_flags, policy,
1145 obj->oo_oinfo->loi_kms_valid,
1147 ols, einfo, &ols->ols_handle,
1148 PTLRPCD_SET, 1, ols->ols_agl);
1150 cl_lock_user_del(env, lock);
1151 cl_lock_unhold(env, lock, "upcall", lock);
1152 if (unlikely(result == -ECANCELED)) {
1153 ols->ols_state = OLS_NEW;
1158 ols->ols_state = OLS_GRANTED;
1159 ols->ols_owner = osc_env_io(env);
1162 LASSERT(ergo(ols->ols_glimpse, !osc_lock_is_lockless(ols)));
1166 static int osc_lock_wait(const struct lu_env *env,
1167 const struct cl_lock_slice *slice)
1169 struct osc_lock *olck = cl2osc_lock(slice);
1170 struct cl_lock *lock = olck->ols_cl.cls_lock;
1172 LINVRNT(osc_lock_invariant(olck));
1174 if (olck->ols_glimpse && olck->ols_state >= OLS_UPCALL_RECEIVED) {
1175 if (olck->ols_flags & LDLM_FL_LVB_READY) {
1177 } else if (olck->ols_agl) {
1178 if (lock->cll_flags & CLF_FROM_UPCALL)
1179 /* It is from enqueue RPC reply upcall for
1180 * updating state. Do not re-enqueue. */
1183 olck->ols_state = OLS_NEW;
1185 LASSERT(lock->cll_error);
1186 return lock->cll_error;
1190 if (olck->ols_state == OLS_NEW) {
1193 LASSERT(olck->ols_agl);
1195 rc = osc_lock_enqueue(env, slice, NULL, CEF_ASYNC | CEF_MUST);
1199 return CLO_REENQUEUED;
1202 LASSERT(equi(olck->ols_state >= OLS_UPCALL_RECEIVED &&
1203 lock->cll_error == 0, olck->ols_lock != NULL));
1205 return lock->cll_error ?: olck->ols_state >= OLS_GRANTED ? 0 : CLO_WAIT;
1209 * An implementation of cl_lock_operations::clo_use() method that pins cached
1212 static int osc_lock_use(const struct lu_env *env,
1213 const struct cl_lock_slice *slice)
1215 struct osc_lock *olck = cl2osc_lock(slice);
1218 LASSERT(!olck->ols_hold);
1221 * Atomically check for LDLM_FL_CBPENDING and addref a lock if this
1222 * flag is not set. This protects us from a concurrent blocking ast.
1224 rc = ldlm_lock_addref_try(&olck->ols_handle, olck->ols_einfo.ei_mode);
1227 olck->ols_state = OLS_GRANTED;
1229 struct cl_lock *lock;
1232 * Lock is being cancelled somewhere within
1233 * ldlm_handle_bl_callback(): LDLM_FL_CBPENDING is already
1234 * set, but osc_ldlm_blocking_ast() hasn't yet acquired
1237 lock = slice->cls_lock;
1238 LASSERT(lock->cll_state == CLS_INTRANSIT);
1239 LASSERT(lock->cll_users > 0);
1240 /* set a flag for osc_dlm_blocking_ast0() to signal the
1242 olck->ols_ast_wait = 1;
1248 static int osc_lock_flush(struct osc_lock *ols, int discard)
1250 struct cl_lock *lock = ols->ols_cl.cls_lock;
1251 struct cl_env_nest nest;
1255 env = cl_env_nested_get(&nest);
1257 struct osc_object *obj = cl2osc(ols->ols_cl.cls_obj);
1258 struct cl_lock_descr *descr = &lock->cll_descr;
1261 if (descr->cld_mode >= CLM_WRITE) {
1262 result = osc_cache_writeback_range(env, obj,
1263 descr->cld_start, descr->cld_end,
1265 LDLM_DEBUG(ols->ols_lock,
1266 "lock %p: %d pages were %s.\n", lock, result,
1267 discard ? "discarded" : "written");
1272 rc = cl_lock_discard_pages(env, lock);
1273 if (result == 0 && rc < 0)
1276 cl_env_nested_put(&nest, env);
1278 result = PTR_ERR(env);
1281 LINVRNT(!osc_lock_has_pages(ols));
1287 * Implements cl_lock_operations::clo_cancel() method for osc layer. This is
1288 * called (as part of cl_lock_cancel()) when lock is canceled either voluntary
1289 * (LRU pressure, early cancellation, umount, etc.) or due to the conflict
1290 * with some other lock some where in the cluster. This function does the
1293 * - invalidates all pages protected by this lock (after sending dirty
1294 * ones to the server, as necessary);
1296 * - decref's underlying ldlm lock;
1298 * - cancels ldlm lock (ldlm_cli_cancel()).
1300 static void osc_lock_cancel(const struct lu_env *env,
1301 const struct cl_lock_slice *slice)
1303 struct cl_lock *lock = slice->cls_lock;
1304 struct osc_lock *olck = cl2osc_lock(slice);
1305 struct ldlm_lock *dlmlock = olck->ols_lock;
1309 LASSERT(cl_lock_is_mutexed(lock));
1310 LINVRNT(osc_lock_invariant(olck));
1312 if (dlmlock != NULL) {
1315 discard = !!(dlmlock->l_flags & LDLM_FL_DISCARD_DATA);
1316 if (olck->ols_state >= OLS_GRANTED)
1317 result = osc_lock_flush(olck, discard);
1318 osc_lock_unhold(olck);
1320 lock_res_and_lock(dlmlock);
1321 /* Now that we're the only user of dlm read/write reference,
1322 * mostly the ->l_readers + ->l_writers should be zero.
1323 * However, there is a corner case.
1324 * See bug 18829 for details.*/
1325 do_cancel = (dlmlock->l_readers == 0 &&
1326 dlmlock->l_writers == 0);
1327 dlmlock->l_flags |= LDLM_FL_CBPENDING;
1328 unlock_res_and_lock(dlmlock);
1330 result = ldlm_cli_cancel(&olck->ols_handle, LCF_ASYNC);
1332 CL_LOCK_DEBUG(D_ERROR, env, lock,
1333 "lock %p cancel failure with error(%d)\n",
1336 olck->ols_state = OLS_CANCELLED;
1337 olck->ols_flags &= ~LDLM_FL_LVB_READY;
1338 osc_lock_detach(env, olck);
1341 static int osc_lock_has_pages(struct osc_lock *olck)
1346 static void osc_lock_delete(const struct lu_env *env,
1347 const struct cl_lock_slice *slice)
1349 struct osc_lock *olck;
1351 olck = cl2osc_lock(slice);
1352 if (olck->ols_glimpse) {
1353 LASSERT(!olck->ols_hold);
1354 LASSERT(!olck->ols_lock);
1358 LINVRNT(osc_lock_invariant(olck));
1359 LINVRNT(!osc_lock_has_pages(olck));
1361 osc_lock_unhold(olck);
1362 osc_lock_detach(env, olck);
1366 * Implements cl_lock_operations::clo_state() method for osc layer.
1368 * Maintains osc_lock::ols_owner field.
1370 * This assumes that lock always enters CLS_HELD (from some other state) in
1371 * the same IO context as one that requested the lock. This should not be a
1372 * problem, because context is by definition shared by all activity pertaining
1373 * to the same high-level IO.
1375 static void osc_lock_state(const struct lu_env *env,
1376 const struct cl_lock_slice *slice,
1377 enum cl_lock_state state)
1379 struct osc_lock *lock = cl2osc_lock(slice);
1382 * XXX multiple io contexts can use the lock at the same time.
1384 LINVRNT(osc_lock_invariant(lock));
1385 if (state == CLS_HELD && slice->cls_lock->cll_state != CLS_HELD) {
1386 struct osc_io *oio = osc_env_io(env);
1388 LASSERT(lock->ols_owner == NULL);
1389 lock->ols_owner = oio;
1390 } else if (state != CLS_HELD)
1391 lock->ols_owner = NULL;
1394 static int osc_lock_print(const struct lu_env *env, void *cookie,
1395 lu_printer_t p, const struct cl_lock_slice *slice)
1397 struct osc_lock *lock = cl2osc_lock(slice);
1400 * XXX print ldlm lock and einfo properly.
1402 (*p)(env, cookie, "%p %#16llx "LPX64" %d %p ",
1403 lock->ols_lock, lock->ols_flags, lock->ols_handle.cookie,
1404 lock->ols_state, lock->ols_owner);
1405 osc_lvb_print(env, cookie, p, &lock->ols_lvb);
1409 static int osc_lock_fits_into(const struct lu_env *env,
1410 const struct cl_lock_slice *slice,
1411 const struct cl_lock_descr *need,
1412 const struct cl_io *io)
1414 struct osc_lock *ols = cl2osc_lock(slice);
1416 if (need->cld_enq_flags & CEF_NEVER)
1419 if (ols->ols_state >= OLS_CANCELLED)
1422 if (need->cld_mode == CLM_PHANTOM) {
1424 return !(ols->ols_state > OLS_RELEASED);
1427 * Note: the QUEUED lock can't be matched here, otherwise
1428 * it might cause the deadlocks.
1430 * P1: enqueued read lock, create sublock1
1431 * P2: enqueued write lock, create sublock2(conflicted
1433 * P1: Grant read lock.
1434 * P1: enqueued glimpse lock(with holding sublock1_read),
1435 * matched with sublock2, waiting sublock2 to be granted.
1436 * But sublock2 can not be granted, because P1
1437 * will not release sublock1. Bang!
1439 if (ols->ols_state < OLS_GRANTED ||
1440 ols->ols_state > OLS_RELEASED)
1442 } else if (need->cld_enq_flags & CEF_MUST) {
1444 * If the lock hasn't ever enqueued, it can't be matched
1445 * because enqueue process brings in many information
1446 * which can be used to determine things such as lockless,
1449 if (ols->ols_state < OLS_UPCALL_RECEIVED &&
1450 ols->ols_locklessable)
1456 static const struct cl_lock_operations osc_lock_ops = {
1457 .clo_fini = osc_lock_fini,
1458 .clo_enqueue = osc_lock_enqueue,
1459 .clo_wait = osc_lock_wait,
1460 .clo_unuse = osc_lock_unuse,
1461 .clo_use = osc_lock_use,
1462 .clo_delete = osc_lock_delete,
1463 .clo_state = osc_lock_state,
1464 .clo_cancel = osc_lock_cancel,
1465 .clo_weigh = osc_lock_weigh,
1466 .clo_print = osc_lock_print,
1467 .clo_fits_into = osc_lock_fits_into,
1470 static int osc_lock_lockless_unuse(const struct lu_env *env,
1471 const struct cl_lock_slice *slice)
1473 struct osc_lock *ols = cl2osc_lock(slice);
1474 struct cl_lock *lock = slice->cls_lock;
1476 LASSERT(ols->ols_state == OLS_GRANTED);
1477 LINVRNT(osc_lock_invariant(ols));
1479 cl_lock_cancel(env, lock);
1480 cl_lock_delete(env, lock);
1484 static void osc_lock_lockless_cancel(const struct lu_env *env,
1485 const struct cl_lock_slice *slice)
1487 struct osc_lock *ols = cl2osc_lock(slice);
1490 result = osc_lock_flush(ols, 0);
1492 CERROR("Pages for lockless lock %p were not purged(%d)\n",
1494 ols->ols_state = OLS_CANCELLED;
1497 static int osc_lock_lockless_wait(const struct lu_env *env,
1498 const struct cl_lock_slice *slice)
1500 struct osc_lock *olck = cl2osc_lock(slice);
1501 struct cl_lock *lock = olck->ols_cl.cls_lock;
1503 LINVRNT(osc_lock_invariant(olck));
1504 LASSERT(olck->ols_state >= OLS_UPCALL_RECEIVED);
1506 return lock->cll_error;
1509 static void osc_lock_lockless_state(const struct lu_env *env,
1510 const struct cl_lock_slice *slice,
1511 enum cl_lock_state state)
1513 struct osc_lock *lock = cl2osc_lock(slice);
1515 LINVRNT(osc_lock_invariant(lock));
1516 if (state == CLS_HELD) {
1517 struct osc_io *oio = osc_env_io(env);
1519 LASSERT(ergo(lock->ols_owner, lock->ols_owner == oio));
1520 lock->ols_owner = oio;
1522 /* set the io to be lockless if this lock is for io's
1524 if (cl_object_same(oio->oi_cl.cis_obj, slice->cls_obj))
1525 oio->oi_lockless = 1;
1529 static int osc_lock_lockless_fits_into(const struct lu_env *env,
1530 const struct cl_lock_slice *slice,
1531 const struct cl_lock_descr *need,
1532 const struct cl_io *io)
1534 struct osc_lock *lock = cl2osc_lock(slice);
1536 if (!(need->cld_enq_flags & CEF_NEVER))
1539 /* lockless lock should only be used by its owning io. b22147 */
1540 return (lock->ols_owner == osc_env_io(env));
1543 static const struct cl_lock_operations osc_lock_lockless_ops = {
1544 .clo_fini = osc_lock_fini,
1545 .clo_enqueue = osc_lock_enqueue,
1546 .clo_wait = osc_lock_lockless_wait,
1547 .clo_unuse = osc_lock_lockless_unuse,
1548 .clo_state = osc_lock_lockless_state,
1549 .clo_fits_into = osc_lock_lockless_fits_into,
1550 .clo_cancel = osc_lock_lockless_cancel,
1551 .clo_print = osc_lock_print
1554 int osc_lock_init(const struct lu_env *env,
1555 struct cl_object *obj, struct cl_lock *lock,
1556 const struct cl_io *unused)
1558 struct osc_lock *clk;
1561 OBD_SLAB_ALLOC_PTR_GFP(clk, osc_lock_kmem, __GFP_IO);
1563 __u32 enqflags = lock->cll_descr.cld_enq_flags;
1565 osc_lock_build_einfo(env, lock, clk, &clk->ols_einfo);
1566 atomic_set(&clk->ols_pageref, 0);
1567 clk->ols_state = OLS_NEW;
1569 clk->ols_flags = osc_enq2ldlm_flags(enqflags);
1570 clk->ols_agl = !!(enqflags & CEF_AGL);
1572 clk->ols_flags |= LDLM_FL_BLOCK_NOWAIT;
1573 if (clk->ols_flags & LDLM_FL_HAS_INTENT)
1574 clk->ols_glimpse = 1;
1576 cl_lock_slice_add(lock, &clk->ols_cl, obj, &osc_lock_ops);
1578 if (!(enqflags & CEF_MUST))
1579 /* try to convert this lock to a lockless lock */
1580 osc_lock_to_lockless(env, clk, (enqflags & CEF_NEVER));
1581 if (clk->ols_locklessable && !(enqflags & CEF_DISCARD_DATA))
1582 clk->ols_flags |= LDLM_FL_DENY_ON_CONTENTION;
1584 LDLM_DEBUG_NOLOCK("lock %p, osc lock %p, flags %llx\n",
1585 lock, clk, clk->ols_flags);
1593 int osc_dlm_lock_pageref(struct ldlm_lock *dlm)
1595 struct osc_lock *olock;
1598 spin_lock(&osc_ast_guard);
1599 olock = dlm->l_ast_data;
1601 * there's a very rare race with osc_page_addref_lock(), but that
1602 * doesn't matter because in the worst case we don't cancel a lock
1603 * which we actually can, that's no harm.
1605 if (olock != NULL &&
1606 atomic_add_return(_PAGEREF_MAGIC,
1607 &olock->ols_pageref) != _PAGEREF_MAGIC) {
1608 atomic_sub(_PAGEREF_MAGIC, &olock->ols_pageref);
1611 spin_unlock(&osc_ast_guard);