1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
6 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
8 * This program is free software; you can redistribute it and/or modify
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15 * General Public License version 2 for more details (a copy is included
16 * in the LICENSE file that accompanied this code).
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20 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
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23 * CA 95054 USA or visit www.sun.com if you need additional information or
29 * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
30 * Use is subject to license terms.
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 /** \addtogroup osc osc @{ */
43 #define DEBUG_SUBSYSTEM S_OSC
46 # include <libcfs/libcfs.h>
48 # include <liblustre.h>
50 /* fid_build_reg_res_name() */
51 #include <lustre_fid.h>
53 #include "osc_cl_internal.h"
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);
66 int osc_lock_is_lockless(const struct osc_lock *olck)
68 return (olck->ols_cl.cls_ops == &osc_lock_lockless_ops);
72 * Returns a weak pointer to the ldlm lock identified by a handle. Returned
73 * pointer cannot be dereferenced, as lock is not protected from concurrent
74 * reclaim. This function is a helper for osc_lock_invariant().
76 static struct ldlm_lock *osc_handle_ptr(struct lustre_handle *handle)
78 struct ldlm_lock *lock;
80 lock = ldlm_handle2lock(handle);
87 * Invariant that has to be true all of the time.
89 static int osc_lock_invariant(struct osc_lock *ols)
91 struct ldlm_lock *lock = osc_handle_ptr(&ols->ols_handle);
92 struct ldlm_lock *olock = ols->ols_lock;
93 int handle_used = lustre_handle_is_used(&ols->ols_handle);
96 ergo(osc_lock_is_lockless(ols),
97 ols->ols_locklessable && ols->ols_lock == NULL) ||
98 (ergo(olock != NULL, handle_used) &&
100 olock->l_handle.h_cookie == ols->ols_handle.cookie) &&
102 * Check that ->ols_handle and ->ols_lock are consistent, but
103 * take into account that they are set at the different time.
106 ergo(lock != NULL && olock != NULL, lock == olock) &&
107 ergo(lock == NULL, olock == NULL)) &&
108 ergo(ols->ols_state == OLS_CANCELLED,
109 olock == NULL && !handle_used) &&
111 * DLM lock is destroyed only after we have seen cancellation
114 ergo(olock != NULL && ols->ols_state < OLS_CANCELLED,
115 !olock->l_destroyed) &&
116 ergo(ols->ols_state == OLS_GRANTED,
118 olock->l_req_mode == olock->l_granted_mode &&
122 /*****************************************************************************
129 * Breaks a link between osc_lock and dlm_lock.
131 static void osc_lock_detach(const struct lu_env *env, struct osc_lock *olck)
133 struct ldlm_lock *dlmlock;
135 spin_lock(&osc_ast_guard);
136 dlmlock = olck->ols_lock;
137 if (dlmlock == NULL) {
138 spin_unlock(&osc_ast_guard);
142 olck->ols_lock = NULL;
143 /* wb(); --- for all who checks (ols->ols_lock != NULL) before
144 * call to osc_lock_detach() */
145 dlmlock->l_ast_data = NULL;
146 olck->ols_handle.cookie = 0ULL;
147 spin_unlock(&osc_ast_guard);
149 lock_res_and_lock(dlmlock);
150 if (dlmlock->l_granted_mode == dlmlock->l_req_mode) {
151 struct cl_object *obj = olck->ols_cl.cls_obj;
152 struct cl_attr *attr = &osc_env_info(env)->oti_attr;
153 __u64 old_kms = cl2osc(obj)->oo_oinfo->loi_kms;
155 /* Update the kms. Need to loop all granted locks.
156 * Not a problem for the client */
157 attr->cat_kms = ldlm_extent_shift_kms(dlmlock, old_kms);
158 unlock_res_and_lock(dlmlock);
160 cl_object_attr_lock(obj);
161 cl_object_attr_set(env, obj, attr, CAT_KMS);
162 cl_object_attr_unlock(obj);
164 unlock_res_and_lock(dlmlock);
166 /* release a reference taken in osc_lock_upcall0(). */
167 lu_ref_del(&dlmlock->l_reference, "osc_lock", olck);
168 LDLM_LOCK_RELEASE(dlmlock);
171 static int osc_lock_unuse(const struct lu_env *env,
172 const struct cl_lock_slice *slice)
174 struct osc_lock *ols = cl2osc_lock(slice);
177 LASSERT(ols->ols_state == OLS_GRANTED ||
178 ols->ols_state == OLS_UPCALL_RECEIVED);
179 LINVRNT(osc_lock_invariant(ols));
181 if (ols->ols_glimpse) {
182 LASSERT(ols->ols_hold == 0);
185 LASSERT(ols->ols_hold);
188 * Move lock into OLS_RELEASED state before calling osc_cancel_base()
189 * so that possible synchronous cancellation (that always happens
190 * e.g., for liblustre) sees that lock is released.
192 ols->ols_state = OLS_RELEASED;
194 result = osc_cancel_base(&ols->ols_handle, ols->ols_einfo.ei_mode);
195 ols->ols_has_ref = 0;
199 static void osc_lock_fini(const struct lu_env *env,
200 struct cl_lock_slice *slice)
202 struct osc_lock *ols = cl2osc_lock(slice);
204 LINVRNT(osc_lock_invariant(ols));
206 * ->ols_hold can still be true at this point if, for example, a
207 * thread that requested a lock was killed (and released a reference
208 * to the lock), before reply from a server was received. In this case
209 * lock is destroyed immediately after upcall.
212 osc_lock_unuse(env, slice);
213 if (ols->ols_lock != NULL)
214 osc_lock_detach(env, ols);
216 OBD_SLAB_FREE_PTR(ols, osc_lock_kmem);
219 void osc_lock_build_res(const struct lu_env *env, const struct osc_object *obj,
220 struct ldlm_res_id *resname)
222 const struct lu_fid *fid = lu_object_fid(&obj->oo_cl.co_lu);
225 * In the perfect world of the future, where ost servers talk
228 fid_build_reg_res_name(fid, resname);
231 * In reality, where ost server expects ->lsm_object_id and
232 * ->lsm_object_gr in rename.
234 osc_build_res_name(obj->oo_oinfo->loi_id, obj->oo_oinfo->loi_gr,
239 static void osc_lock_build_policy(const struct lu_env *env,
240 const struct cl_lock *lock,
241 ldlm_policy_data_t *policy)
243 const struct cl_lock_descr *d = &lock->cll_descr;
245 osc_index2policy(policy, d->cld_obj, d->cld_start, d->cld_end);
248 static int osc_enq2ldlm_flags(__u32 enqflags)
252 LASSERT((enqflags & ~CEF_MASK) == 0);
254 if (enqflags & CEF_NONBLOCK)
255 result |= LDLM_FL_BLOCK_NOWAIT;
256 if (enqflags & CEF_ASYNC)
257 result |= LDLM_FL_HAS_INTENT;
258 if (enqflags & CEF_DISCARD_DATA)
259 result |= LDLM_AST_DISCARD_DATA;
264 * Global spin-lock protecting consistency of ldlm_lock::l_ast_data
265 * pointers. Initialized in osc_init().
267 spinlock_t osc_ast_guard;
269 static struct osc_lock *osc_ast_data_get(struct ldlm_lock *dlm_lock)
271 struct osc_lock *olck;
273 lock_res_and_lock(dlm_lock);
274 spin_lock(&osc_ast_guard);
275 olck = dlm_lock->l_ast_data;
277 struct cl_lock *lock = olck->ols_cl.cls_lock;
279 * If osc_lock holds a reference on ldlm lock, return it even
280 * when cl_lock is in CLS_FREEING state. This way
282 * osc_ast_data_get(dlmlock) == NULL
284 * guarantees that all osc references on dlmlock were
285 * released. osc_dlm_blocking_ast0() relies on that.
287 if (lock->cll_state < CLS_FREEING || olck->ols_has_ref) {
288 cl_lock_get_trust(lock);
289 lu_ref_add_atomic(&lock->cll_reference,
290 "ast", cfs_current());
294 spin_unlock(&osc_ast_guard);
295 unlock_res_and_lock(dlm_lock);
299 static void osc_ast_data_put(const struct lu_env *env, struct osc_lock *olck)
301 struct cl_lock *lock;
303 lock = olck->ols_cl.cls_lock;
304 lu_ref_del(&lock->cll_reference, "ast", cfs_current());
305 cl_lock_put(env, lock);
309 * Updates object attributes from a lock value block (lvb) received together
310 * with the DLM lock reply from the server. Copy of osc_update_enqueue()
313 * This can be optimized to not update attributes when lock is a result of a
316 * Called under lock and resource spin-locks.
318 static void osc_lock_lvb_update(const struct lu_env *env, struct osc_lock *olck,
322 struct cl_object *obj;
323 struct lov_oinfo *oinfo;
324 struct cl_attr *attr;
329 if (!(olck->ols_flags & LDLM_FL_LVB_READY)) {
334 lvb = &olck->ols_lvb;
335 obj = olck->ols_cl.cls_obj;
336 oinfo = cl2osc(obj)->oo_oinfo;
337 attr = &osc_env_info(env)->oti_attr;
338 valid = CAT_BLOCKS | CAT_ATIME | CAT_CTIME | CAT_MTIME | CAT_SIZE;
339 cl_lvb2attr(attr, lvb);
341 cl_object_attr_lock(obj);
343 struct ldlm_lock *dlmlock;
346 dlmlock = olck->ols_lock;
347 LASSERT(dlmlock != NULL);
349 /* re-grab LVB from a dlm lock under DLM spin-locks. */
350 *lvb = *(struct ost_lvb *)dlmlock->l_lvb_data;
351 size = lvb->lvb_size;
352 /* Extend KMS up to the end of this lock and no further
353 * A lock on [x,y] means a KMS of up to y + 1 bytes! */
354 if (size > dlmlock->l_policy_data.l_extent.end)
355 size = dlmlock->l_policy_data.l_extent.end + 1;
356 if (size >= oinfo->loi_kms) {
357 LDLM_DEBUG(dlmlock, "lock acquired, setting rss="LPU64
358 ", kms="LPU64, lvb->lvb_size, size);
360 attr->cat_kms = size;
362 LDLM_DEBUG(dlmlock, "lock acquired, setting rss="
363 LPU64"; leaving kms="LPU64", end="LPU64,
364 lvb->lvb_size, oinfo->loi_kms,
365 dlmlock->l_policy_data.l_extent.end);
367 ldlm_lock_allow_match_locked(dlmlock);
368 } else if (rc == -ENAVAIL && olck->ols_glimpse) {
369 CDEBUG(D_INODE, "glimpsed, setting rss="LPU64"; leaving"
370 " kms="LPU64"\n", lvb->lvb_size, oinfo->loi_kms);
375 cl_object_attr_set(env, obj, attr, valid);
377 cl_object_attr_unlock(obj);
383 * Called when a lock is granted, from an upcall (when server returned a
384 * granted lock), or from completion AST, when server returned a blocked lock.
386 * Called under lock and resource spin-locks, that are released temporarily
389 static void osc_lock_granted(const struct lu_env *env, struct osc_lock *olck,
390 struct ldlm_lock *dlmlock, int rc)
392 struct ldlm_extent *ext;
393 struct cl_lock *lock;
394 struct cl_lock_descr *descr;
396 LASSERT(dlmlock->l_granted_mode == dlmlock->l_req_mode);
399 if (olck->ols_state != OLS_GRANTED) {
400 lock = olck->ols_cl.cls_lock;
401 ext = &dlmlock->l_policy_data.l_extent;
402 descr = &osc_env_info(env)->oti_descr;
403 descr->cld_obj = lock->cll_descr.cld_obj;
405 /* XXX check that ->l_granted_mode is valid. */
406 descr->cld_mode = osc_ldlm2cl_lock(dlmlock->l_granted_mode);
407 descr->cld_start = cl_index(descr->cld_obj, ext->start);
408 descr->cld_end = cl_index(descr->cld_obj, ext->end);
410 * tell upper layers the extent of the lock that was actually
413 olck->ols_state = OLS_GRANTED;
414 osc_lock_lvb_update(env, olck, rc);
416 /* release DLM spin-locks to allow cl_lock_{modify,signal}()
417 * to take a semaphore on a parent lock. This is safe, because
418 * spin-locks are needed to protect consistency of
419 * dlmlock->l_*_mode and LVB, and we have finished processing
421 unlock_res_and_lock(dlmlock);
422 cl_lock_modify(env, lock, descr);
423 cl_lock_signal(env, lock);
424 LINVRNT(osc_lock_invariant(olck));
425 lock_res_and_lock(dlmlock);
430 static void osc_lock_upcall0(const struct lu_env *env, struct osc_lock *olck)
433 struct ldlm_lock *dlmlock;
437 dlmlock = ldlm_handle2lock_long(&olck->ols_handle, 0);
438 LASSERT(dlmlock != NULL);
440 lock_res_and_lock(dlmlock);
441 spin_lock(&osc_ast_guard);
442 LASSERT(dlmlock->l_ast_data == olck);
443 LASSERT(olck->ols_lock == NULL);
444 olck->ols_lock = dlmlock;
445 spin_unlock(&osc_ast_guard);
448 * Lock might be not yet granted. In this case, completion ast
449 * (osc_ldlm_completion_ast()) comes later and finishes lock
452 if (dlmlock->l_granted_mode == dlmlock->l_req_mode)
453 osc_lock_granted(env, olck, dlmlock, 0);
454 unlock_res_and_lock(dlmlock);
457 * osc_enqueue_interpret() decrefs asynchronous locks, counter
460 ldlm_lock_addref(&olck->ols_handle, olck->ols_einfo.ei_mode);
461 olck->ols_hold = olck->ols_has_ref = 1;
463 /* lock reference taken by ldlm_handle2lock_long() is owned by
464 * osc_lock and released in osc_lock_detach() */
465 lu_ref_add(&dlmlock->l_reference, "osc_lock", olck);
469 * Lock upcall function that is executed either when a reply to ENQUEUE rpc is
470 * received from a server, or after osc_enqueue_base() matched a local DLM
473 static int osc_lock_upcall(void *cookie, int errcode)
475 struct osc_lock *olck = cookie;
476 struct cl_lock_slice *slice = &olck->ols_cl;
477 struct cl_lock *lock = slice->cls_lock;
484 * XXX environment should be created in ptlrpcd.
486 env = cl_env_get(&refcheck);
490 cl_lock_mutex_get(env, lock);
492 LASSERT(lock->cll_state >= CLS_QUEUING);
493 if (olck->ols_state == OLS_ENQUEUED) {
494 olck->ols_state = OLS_UPCALL_RECEIVED;
495 rc = ldlm_error2errno(errcode);
496 } else if (olck->ols_state == OLS_CANCELLED) {
499 CERROR("Impossible state: %i\n", olck->ols_state);
503 struct ldlm_lock *dlmlock;
505 dlmlock = ldlm_handle2lock(&olck->ols_handle);
506 if (dlmlock != NULL) {
507 lock_res_and_lock(dlmlock);
508 spin_lock(&osc_ast_guard);
509 LASSERT(olck->ols_lock == NULL);
510 dlmlock->l_ast_data = NULL;
511 olck->ols_handle.cookie = 0ULL;
512 spin_unlock(&osc_ast_guard);
513 unlock_res_and_lock(dlmlock);
514 LDLM_LOCK_PUT(dlmlock);
517 if (olck->ols_glimpse)
518 olck->ols_glimpse = 0;
519 osc_lock_upcall0(env, olck);
522 /* Error handling, some errors are tolerable. */
523 if (olck->ols_locklessable && rc == -EUSERS) {
524 /* This is a tolerable error, turn this lock into
527 osc_object_set_contended(cl2osc(slice->cls_obj));
528 LASSERT(slice->cls_ops == &osc_lock_ops);
530 /* Change this lock to ldlmlock-less lock. */
531 osc_lock_to_lockless(env, olck, 1);
532 olck->ols_state = OLS_GRANTED;
534 } else if (olck->ols_glimpse && rc == -ENAVAIL) {
535 osc_lock_lvb_update(env, olck, rc);
536 cl_lock_delete(env, lock);
537 /* Hide the error. */
542 /* on error, lock was signaled by cl_lock_error() */
543 cl_lock_signal(env, lock);
545 cl_lock_error(env, lock, rc);
547 cl_lock_mutex_put(env, lock);
549 /* release cookie reference, acquired by osc_lock_enqueue() */
550 lu_ref_del(&lock->cll_reference, "upcall", lock);
551 cl_lock_put(env, lock);
552 cl_env_put(env, &refcheck);
554 /* should never happen, similar to osc_ldlm_blocking_ast(). */
560 * Core of osc_dlm_blocking_ast() logic.
562 static void osc_lock_blocking(const struct lu_env *env,
563 struct ldlm_lock *dlmlock,
564 struct osc_lock *olck, int blocking)
566 struct cl_lock *lock = olck->ols_cl.cls_lock;
568 LASSERT(olck->ols_lock == dlmlock);
569 CLASSERT(OLS_BLOCKED < OLS_CANCELLED);
570 LASSERT(!osc_lock_is_lockless(olck));
574 * Lock might be still addref-ed here, if e.g., blocking ast
575 * is sent for a failed lock.
577 osc_lock_unuse(env, &olck->ols_cl);
579 if (blocking && olck->ols_state < OLS_BLOCKED)
581 * Move osc_lock into OLS_BLOCKED before canceling the lock,
582 * because it recursively re-enters osc_lock_blocking(), with
583 * the state set to OLS_CANCELLED.
585 olck->ols_state = OLS_BLOCKED;
587 * cancel and destroy lock at least once no matter how blocking ast is
588 * entered (see comment above osc_ldlm_blocking_ast() for use
589 * cases). cl_lock_cancel() and cl_lock_delete() are idempotent.
591 cl_lock_cancel(env, lock);
592 cl_lock_delete(env, lock);
596 * Helper for osc_dlm_blocking_ast() handling discrepancies between cl_lock
597 * and ldlm_lock caches.
599 static int osc_dlm_blocking_ast0(const struct lu_env *env,
600 struct ldlm_lock *dlmlock,
601 void *data, int flag)
603 struct osc_lock *olck;
604 struct cl_lock *lock;
608 LASSERT(flag == LDLM_CB_BLOCKING || flag == LDLM_CB_CANCELING);
611 olck = osc_ast_data_get(dlmlock);
613 lock = olck->ols_cl.cls_lock;
614 cl_lock_mutex_get(env, lock);
615 LINVRNT(osc_lock_invariant(olck));
616 if (olck->ols_ast_wait) {
617 /* wake up osc_lock_use() */
618 cl_lock_signal(env, lock);
619 olck->ols_ast_wait = 0;
622 * Lock might have been canceled while this thread was
623 * sleeping for lock mutex, but olck is pinned in memory.
625 if (olck == dlmlock->l_ast_data) {
627 * NOTE: DLM sends blocking AST's for failed locks
628 * (that are still in pre-OLS_GRANTED state)
629 * too, and they have to be canceled otherwise
630 * DLM lock is never destroyed and stuck in
633 * Alternatively, ldlm_cli_cancel() can be
634 * called here directly for osc_locks with
635 * ols_state < OLS_GRANTED to maintain an
636 * invariant that ->clo_cancel() is only called
637 * for locks that were granted.
639 LASSERT(data == olck);
640 osc_lock_blocking(env, dlmlock,
641 olck, flag == LDLM_CB_BLOCKING);
644 cl_lock_mutex_put(env, lock);
645 osc_ast_data_put(env, olck);
648 * DLM lock exists, but there is no cl_lock attached to it.
649 * This is a `normal' race. cl_object and its cl_lock's can be
650 * removed by memory pressure, together with all pages.
652 cancel = (flag == LDLM_CB_BLOCKING);
655 struct lustre_handle *lockh;
657 lockh = &osc_env_info(env)->oti_handle;
658 ldlm_lock2handle(dlmlock, lockh);
659 result = ldlm_cli_cancel(lockh);
666 * Blocking ast invoked by ldlm when dlm lock is either blocking progress of
667 * some other lock, or is canceled. This function is installed as a
668 * ldlm_lock::l_blocking_ast() for client extent locks.
670 * Control flow is tricky, because ldlm uses the same call-back
671 * (ldlm_lock::l_blocking_ast()) for both blocking and cancellation ast's.
673 * \param dlmlock lock for which ast occurred.
675 * \param new description of a conflicting lock in case of blocking ast.
677 * \param data value of dlmlock->l_ast_data
679 * \param flag LDLM_CB_BLOCKING or LDLM_CB_CANCELING. Used to distinguish
680 * cancellation and blocking ast's.
682 * Possible use cases:
684 * - ldlm calls dlmlock->l_blocking_ast(..., LDLM_CB_CANCELING) to cancel
685 * lock due to lock lru pressure, or explicit user request to purge
688 * - ldlm calls dlmlock->l_blocking_ast(..., LDLM_CB_BLOCKING) to notify
689 * us that dlmlock conflicts with another lock that some client is
690 * enqueing. Lock is canceled.
692 * - cl_lock_cancel() is called. osc_lock_cancel() calls
693 * ldlm_cli_cancel() that calls
695 * dlmlock->l_blocking_ast(..., LDLM_CB_CANCELING)
697 * recursively entering osc_ldlm_blocking_ast().
699 * - client cancels lock voluntary (e.g., as a part of early cancellation):
702 * osc_lock_cancel()->
703 * ldlm_cli_cancel()->
704 * dlmlock->l_blocking_ast(..., LDLM_CB_CANCELING)
707 static int osc_ldlm_blocking_ast(struct ldlm_lock *dlmlock,
708 struct ldlm_lock_desc *new, void *data,
712 struct cl_env_nest nest;
716 * This can be called in the context of outer IO, e.g.,
719 * ->osc_enqueue_base()->...
720 * ->ldlm_prep_elc_req()->...
721 * ->ldlm_cancel_callback()->...
722 * ->osc_ldlm_blocking_ast()
724 * new environment has to be created to not corrupt outer context.
726 env = cl_env_nested_get(&nest);
728 result = osc_dlm_blocking_ast0(env, dlmlock, data, flag);
730 result = PTR_ERR(env);
732 * XXX This should never happen, as cl_lock is
733 * stuck. Pre-allocated environment a la vvp_inode_fini_env
739 if (result == -ENODATA)
742 CERROR("BAST failed: %d\n", result);
744 cl_env_nested_put(&nest, env);
748 static int osc_ldlm_completion_ast(struct ldlm_lock *dlmlock,
749 int flags, void *data)
753 struct osc_lock *olck;
754 struct cl_lock *lock;
759 /* first, do dlm part of the work */
760 dlmrc = ldlm_completion_ast_async(dlmlock, flags, data);
761 /* then, notify cl_lock */
762 env_cookie = cl_env_reenter();
763 env = cl_env_get(&refcheck);
765 olck = osc_ast_data_get(dlmlock);
767 lock = olck->ols_cl.cls_lock;
768 cl_lock_mutex_get(env, lock);
770 * ldlm_handle_cp_callback() copied LVB from request
771 * to lock->l_lvb_data, store it in osc_lock.
773 LASSERT(dlmlock->l_lvb_data != NULL);
774 lock_res_and_lock(dlmlock);
775 olck->ols_lvb = *(struct ost_lvb *)dlmlock->l_lvb_data;
776 if (olck->ols_lock == NULL)
778 * upcall (osc_lock_upcall()) hasn't yet been
779 * called. Do nothing now, upcall will bind
780 * olck to dlmlock and signal the waiters.
782 * This maintains an invariant that osc_lock
783 * and ldlm_lock are always bound when
784 * osc_lock is in OLS_GRANTED state.
787 else if (dlmlock->l_granted_mode != LCK_MINMODE)
788 osc_lock_granted(env, olck, dlmlock, dlmrc);
790 cl_lock_error(env, lock, dlmrc);
791 unlock_res_and_lock(dlmlock);
792 cl_lock_mutex_put(env, lock);
793 osc_ast_data_put(env, olck);
796 result = -ELDLM_NO_LOCK_DATA;
797 cl_env_put(env, &refcheck);
799 result = PTR_ERR(env);
800 cl_env_reexit(env_cookie);
801 return dlmrc ?: result;
804 static int osc_ldlm_glimpse_ast(struct ldlm_lock *dlmlock, void *data)
806 struct ptlrpc_request *req = data;
807 struct osc_lock *olck;
808 struct cl_lock *lock;
809 struct cl_object *obj;
812 struct req_capsule *cap;
816 LASSERT(lustre_msg_get_opc(req->rq_reqmsg) == LDLM_GL_CALLBACK);
818 env = cl_env_get(&refcheck);
821 * osc_ast_data_get() has to go after environment is
822 * allocated, because osc_ast_data() acquires a
823 * reference to a lock, and it can only be released in
826 olck = osc_ast_data_get(dlmlock);
828 lock = olck->ols_cl.cls_lock;
829 cl_lock_mutex_get(env, lock);
831 req_capsule_extend(cap, &RQF_LDLM_GL_CALLBACK);
832 req_capsule_set_size(cap, &RMF_DLM_LVB, RCL_SERVER,
834 result = req_capsule_server_pack(cap);
836 lvb = req_capsule_server_get(cap, &RMF_DLM_LVB);
837 obj = lock->cll_descr.cld_obj;
838 result = cl_object_glimpse(env, obj, lvb);
840 cl_lock_mutex_put(env, lock);
841 osc_ast_data_put(env, olck);
844 * These errors are normal races, so we don't want to
845 * fill the console with messages by calling
848 lustre_pack_reply(req, 1, NULL, NULL);
849 result = -ELDLM_NO_LOCK_DATA;
851 cl_env_put(env, &refcheck);
853 result = PTR_ERR(env);
854 req->rq_status = result;
858 static unsigned long osc_lock_weigh(const struct lu_env *env,
859 const struct cl_lock_slice *slice)
862 * don't need to grab coh_page_guard since we don't care the exact #
865 return cl_object_header(slice->cls_obj)->coh_pages;
869 * Get the weight of dlm lock for early cancellation.
871 * XXX: it should return the pages covered by this \a dlmlock.
873 static unsigned long osc_ldlm_weigh_ast(struct ldlm_lock *dlmlock)
878 struct osc_lock *lock;
880 unsigned long weight;
884 cookie = cl_env_reenter();
886 * osc_ldlm_weigh_ast has a complex context since it might be called
887 * because of lock canceling, or from user's input. We have to make
888 * a new environment for it. Probably it is implementation safe to use
889 * the upper context because cl_lock_put don't modify environment
890 * variables. But in case of ..
892 env = cl_env_get(&refcheck);
894 /* Mostly because lack of memory, tend to eliminate this lock*/
895 cl_env_reexit(cookie);
899 LASSERT(dlmlock->l_resource->lr_type == LDLM_EXTENT);
900 lock = osc_ast_data_get(dlmlock);
902 /* cl_lock was destroyed because of memory pressure.
903 * It is much reasonable to assign this type of lock
906 GOTO(out, weight = 0);
909 cll = lock->ols_cl.cls_lock;
910 cl_lock_mutex_get(env, cll);
911 weight = cl_lock_weigh(env, cll);
912 cl_lock_mutex_put(env, cll);
913 osc_ast_data_put(env, lock);
917 cl_env_put(env, &refcheck);
918 cl_env_reexit(cookie);
922 static void osc_lock_build_einfo(const struct lu_env *env,
923 const struct cl_lock *clock,
924 struct osc_lock *lock,
925 struct ldlm_enqueue_info *einfo)
927 enum cl_lock_mode mode;
929 mode = clock->cll_descr.cld_mode;
930 if (mode == CLM_PHANTOM)
932 * For now, enqueue all glimpse locks in read mode. In the
933 * future, client might choose to enqueue LCK_PW lock for
934 * glimpse on a file opened for write.
938 einfo->ei_type = LDLM_EXTENT;
939 einfo->ei_mode = osc_cl_lock2ldlm(mode);
940 einfo->ei_cb_bl = osc_ldlm_blocking_ast;
941 einfo->ei_cb_cp = osc_ldlm_completion_ast;
942 einfo->ei_cb_gl = osc_ldlm_glimpse_ast;
943 einfo->ei_cb_wg = osc_ldlm_weigh_ast;
944 einfo->ei_cbdata = lock; /* value to be put into ->l_ast_data */
948 * Cancels \a conflict lock and waits until it reached CLS_FREEING state. This
949 * is called as a part of enqueuing to cancel conflicting locks early.
951 * \retval 0: success, \a conflict was cancelled and destroyed.
953 * \retval CLO_REPEAT: \a conflict was cancelled, but \a lock mutex was
954 * released in the process. Repeat enqueing.
956 * \retval -EWOULDBLOCK: \a conflict cannot be cancelled immediately, and
957 * either \a lock is non-blocking, or current thread
958 * holds other locks, that prevent it from waiting
959 * for cancel to complete.
961 * \retval -ve: other error, including -EINTR.
964 static int osc_lock_cancel_wait(const struct lu_env *env, struct cl_lock *lock,
965 struct cl_lock *conflict, int canwait)
969 LASSERT(cl_lock_is_mutexed(lock));
970 LASSERT(cl_lock_is_mutexed(conflict));
973 if (conflict->cll_state != CLS_FREEING) {
974 cl_lock_cancel(env, conflict);
975 cl_lock_delete(env, conflict);
976 if (conflict->cll_flags & (CLF_CANCELPEND|CLF_DOOMED)) {
978 if (cl_lock_nr_mutexed(env) > 2)
980 * If mutices of locks other than @lock and
981 * @scan are held by the current thread, it
982 * cannot wait on @scan state change in a
983 * dead-lock safe matter, so simply skip early
984 * cancellation in this case.
986 * This means that early cancellation doesn't
987 * work when there is even slight mutex
988 * contention, as top-lock's mutex is usually
993 /* Waiting for @scan to be destroyed */
994 cl_lock_mutex_put(env, lock);
996 rc = cl_lock_state_wait(env, conflict);
998 conflict->cll_state < CLS_FREEING);
999 /* mutex was released, repeat enqueue. */
1000 rc = rc ?: CLO_REPEAT;
1001 cl_lock_mutex_get(env, lock);
1004 LASSERT(ergo(!rc, conflict->cll_state == CLS_FREEING));
1005 CDEBUG(D_INFO, "lock %p was %s freed now, rc (%d)\n",
1006 conflict, rc ? "not":"", rc);
1012 * Determine if the lock should be converted into a lockless lock.
1015 * - if the lock has an explicite requirment for a non-lockless lock;
1016 * - if the io lock request type ci_lockreq;
1017 * - send the enqueue rpc to ost to make the further decision;
1018 * - special treat to truncate lockless lock
1020 * Additional policy can be implemented here, e.g., never do lockless-io
1021 * for large extents.
1023 static void osc_lock_to_lockless(const struct lu_env *env,
1024 struct osc_lock *ols, int force)
1026 struct cl_lock_slice *slice = &ols->ols_cl;
1027 struct cl_lock *lock = slice->cls_lock;
1029 LASSERT(ols->ols_state == OLS_NEW ||
1030 ols->ols_state == OLS_UPCALL_RECEIVED);
1033 ols->ols_locklessable = 1;
1034 LASSERT(cl_lock_is_mutexed(lock));
1035 slice->cls_ops = &osc_lock_lockless_ops;
1037 struct osc_io *oio = osc_env_io(env);
1038 struct cl_io *io = oio->oi_cl.cis_io;
1039 struct cl_object *obj = slice->cls_obj;
1040 struct osc_object *oob = cl2osc(obj);
1041 const struct osc_device *osd = lu2osc_dev(obj->co_lu.lo_dev);
1042 struct obd_connect_data *ocd;
1044 LASSERT(io->ci_lockreq == CILR_MANDATORY ||
1045 io->ci_lockreq == CILR_MAYBE ||
1046 io->ci_lockreq == CILR_NEVER);
1048 ocd = &class_exp2cliimp(osc_export(oob))->imp_connect_data;
1049 ols->ols_locklessable = (io->ci_type != CIT_TRUNC) &&
1050 (io->ci_lockreq == CILR_MAYBE) &&
1051 (ocd->ocd_connect_flags & OBD_CONNECT_SRVLOCK);
1052 if (io->ci_lockreq == CILR_NEVER ||
1054 (ols->ols_locklessable && osc_object_is_contended(oob)) ||
1055 /* lockless truncate */
1056 (io->ci_type == CIT_TRUNC &&
1057 (ocd->ocd_connect_flags & OBD_CONNECT_TRUNCLOCK) &&
1058 osd->od_lockless_truncate)) {
1059 ols->ols_locklessable = 1;
1060 slice->cls_ops = &osc_lock_lockless_ops;
1063 LASSERT(ergo(ols->ols_glimpse, !osc_lock_is_lockless(ols)));
1067 * Cancel all conflicting locks and wait for them to be destroyed.
1069 * This function is used for two purposes:
1071 * - early cancel all conflicting locks before starting IO, and
1073 * - guarantee that pages added to the page cache by lockless IO are never
1074 * covered by locks other than lockless IO lock, and, hence, are not
1075 * visible to other threads.
1077 static int osc_lock_enqueue_wait(const struct lu_env *env,
1078 const struct osc_lock *olck)
1080 struct cl_lock *lock = olck->ols_cl.cls_lock;
1081 struct cl_lock_descr *descr = &lock->cll_descr;
1082 struct cl_object_header *hdr = cl_object_header(descr->cld_obj);
1083 struct cl_lock_closure *closure = &osc_env_info(env)->oti_closure;
1084 struct cl_lock *scan;
1085 struct cl_lock *temp;
1086 int lockless = osc_lock_is_lockless(olck);
1092 LASSERT(cl_lock_is_mutexed(lock));
1093 LASSERT(lock->cll_state == CLS_QUEUING);
1096 * XXX This function could be sped up if we had asynchronous
1101 !(olck->ols_flags & LDLM_FL_BLOCK_NOWAIT) &&
1102 cl_lock_nr_mutexed(env) == 1;
1103 cl_lock_closure_init(env, closure, lock, canwait);
1104 spin_lock(&hdr->coh_lock_guard);
1105 list_for_each_entry_safe(scan, temp, &hdr->coh_locks, cll_linkage) {
1109 if (scan->cll_state < CLS_QUEUING ||
1110 scan->cll_state == CLS_FREEING ||
1111 scan->cll_descr.cld_start > descr->cld_end ||
1112 scan->cll_descr.cld_end < descr->cld_start)
1115 /* overlapped and living locks. */
1116 /* A tricky case for lockless pages:
1117 * We need to cancel the compatible locks if we're enqueuing
1118 * a lockless lock, for example:
1119 * imagine that client has PR lock on [0, 1000], and thread T0
1120 * is doing lockless IO in [500, 1500] region. Concurrent
1121 * thread T1 can see lockless data in [500, 1000], which is
1122 * wrong, because these data are possibly stale.
1124 if (!lockless && cl_lock_compatible(scan, lock))
1127 /* Now @scan is conflicting with @lock, this means current
1128 * thread have to sleep for @scan being destroyed. */
1129 cl_lock_get_trust(scan);
1130 if (&temp->cll_linkage != &hdr->coh_locks)
1131 cl_lock_get_trust(temp);
1132 spin_unlock(&hdr->coh_lock_guard);
1133 lu_ref_add(&scan->cll_reference, "cancel-wait", lock);
1135 LASSERT(list_empty(&closure->clc_list));
1136 rc = cl_lock_closure_build(env, scan, closure);
1138 rc = osc_lock_cancel_wait(env, lock, scan, canwait);
1139 cl_lock_disclosure(env, closure);
1140 if (rc == -EWOULDBLOCK)
1143 if (rc == CLO_REPEAT && !canwait)
1144 /* cannot wait... no early cancellation. */
1147 lu_ref_del(&scan->cll_reference, "cancel-wait", lock);
1148 cl_lock_put(env, scan);
1149 spin_lock(&hdr->coh_lock_guard);
1151 * Lock list could have been modified, while spin-lock was
1152 * released. Check that it is safe to continue.
1154 stop = list_empty(&temp->cll_linkage);
1155 if (&temp->cll_linkage != &hdr->coh_locks)
1156 cl_lock_put(env, temp);
1157 if (stop || rc != 0)
1160 spin_unlock(&hdr->coh_lock_guard);
1161 cl_lock_closure_fini(closure);
1166 * Deadlock avoidance for osc_lock_enqueue(). Consider following scenario:
1168 * - Thread0: obtains PR:[0, 10]. Lock is busy.
1170 * - Thread1: enqueues PW:[5, 50]. Blocking ast is sent to
1171 * PR:[0, 10], but cancellation of busy lock is postponed.
1173 * - Thread0: enqueue PR:[30, 40]. Lock is locally matched to
1174 * PW:[5, 50], and thread0 waits for the lock completion never
1175 * releasing PR:[0, 10]---deadlock.
1177 * The second PR lock can be glimpse (it is to deal with that situation that
1178 * ll_glimpse_size() has second argument, preventing local match of
1179 * not-yet-granted locks, see bug 10295). Similar situation is possible in the
1180 * case of memory mapped user level buffer.
1182 * To prevent this we can detect a situation when current "thread" or "io"
1183 * already holds a lock on this object and either add LDLM_FL_BLOCK_GRANTED to
1184 * the ols->ols_flags, or prevent local match with PW locks.
1186 static int osc_deadlock_is_possible(const struct lu_env *env,
1187 struct cl_lock *lock)
1189 struct cl_object *obj;
1190 struct cl_object_header *head;
1191 struct cl_lock *scan;
1198 LASSERT(cl_lock_is_mutexed(lock));
1200 oio = osc_env_io(env);
1201 obj = lock->cll_descr.cld_obj;
1202 head = cl_object_header(obj);
1205 spin_lock(&head->coh_lock_guard);
1206 list_for_each_entry(scan, &head->coh_locks, cll_linkage) {
1208 struct osc_lock *oscan;
1210 oscan = osc_lock_at(scan);
1211 LASSERT(oscan != NULL);
1212 if (oscan->ols_owner == oio) {
1218 spin_unlock(&head->coh_lock_guard);
1223 * Implementation of cl_lock_operations::clo_enqueue() method for osc
1224 * layer. This initiates ldlm enqueue:
1226 * - checks for possible dead-lock conditions (osc_deadlock_is_possible());
1228 * - cancels conflicting locks early (osc_lock_enqueue_wait());
1230 * - calls osc_enqueue_base() to do actual enqueue.
1232 * osc_enqueue_base() is supplied with an upcall function that is executed
1233 * when lock is received either after a local cached ldlm lock is matched, or
1234 * when a reply from the server is received.
1236 * This function does not wait for the network communication to complete.
1238 static int osc_lock_enqueue(const struct lu_env *env,
1239 const struct cl_lock_slice *slice,
1240 struct cl_io *_, __u32 enqflags)
1242 struct osc_lock *ols = cl2osc_lock(slice);
1243 struct cl_lock *lock = ols->ols_cl.cls_lock;
1244 struct osc_object *obj = cl2osc(slice->cls_obj);
1245 struct osc_thread_info *info = osc_env_info(env);
1246 struct ldlm_res_id *resname = &info->oti_resname;
1247 ldlm_policy_data_t *policy = &info->oti_policy;
1248 struct ldlm_enqueue_info *einfo = &ols->ols_einfo;
1252 LASSERT(cl_lock_is_mutexed(lock));
1253 LASSERT(lock->cll_state == CLS_QUEUING);
1254 LASSERT(ols->ols_state == OLS_NEW);
1256 osc_lock_build_res(env, obj, resname);
1257 osc_lock_build_policy(env, lock, policy);
1258 ols->ols_flags = osc_enq2ldlm_flags(enqflags);
1259 if (osc_deadlock_is_possible(env, lock))
1260 ols->ols_flags |= LDLM_FL_BLOCK_GRANTED;
1261 if (ols->ols_flags & LDLM_FL_HAS_INTENT)
1262 ols->ols_glimpse = 1;
1264 result = osc_lock_enqueue_wait(env, ols);
1266 if (!(enqflags & CEF_MUST))
1267 /* try to convert this lock to a lockless lock */
1268 osc_lock_to_lockless(env, ols, (enqflags & CEF_NEVER));
1269 if (!osc_lock_is_lockless(ols)) {
1270 if (ols->ols_locklessable)
1271 ols->ols_flags |= LDLM_FL_DENY_ON_CONTENTION;
1273 /* a reference for lock, passed as an upcall cookie */
1275 lu_ref_add(&lock->cll_reference, "upcall", lock);
1276 ols->ols_state = OLS_ENQUEUED;
1279 * XXX: this is possible blocking point as
1280 * ldlm_lock_match(LDLM_FL_LVB_READY) waits for
1283 result = osc_enqueue_base(osc_export(obj), resname,
1284 &ols->ols_flags, policy,
1286 obj->oo_oinfo->loi_kms_valid,
1288 ols, einfo, &ols->ols_handle,
1291 lu_ref_del(&lock->cll_reference,
1293 cl_lock_put(env, lock);
1296 ols->ols_state = OLS_GRANTED;
1299 LASSERT(ergo(ols->ols_glimpse, !osc_lock_is_lockless(ols)));
1303 static int osc_lock_wait(const struct lu_env *env,
1304 const struct cl_lock_slice *slice)
1306 struct osc_lock *olck = cl2osc_lock(slice);
1307 struct cl_lock *lock = olck->ols_cl.cls_lock;
1309 LINVRNT(osc_lock_invariant(olck));
1310 if (olck->ols_glimpse && olck->ols_state >= OLS_UPCALL_RECEIVED)
1313 LASSERT(equi(olck->ols_state >= OLS_UPCALL_RECEIVED &&
1314 lock->cll_error == 0, olck->ols_lock != NULL));
1316 return lock->cll_error ?: olck->ols_state >= OLS_GRANTED ? 0 : CLO_WAIT;
1320 * An implementation of cl_lock_operations::clo_use() method that pins cached
1323 static int osc_lock_use(const struct lu_env *env,
1324 const struct cl_lock_slice *slice)
1326 struct osc_lock *olck = cl2osc_lock(slice);
1329 LASSERT(!olck->ols_hold);
1331 * Atomically check for LDLM_FL_CBPENDING and addref a lock if this
1332 * flag is not set. This protects us from a concurrent blocking ast.
1334 rc = ldlm_lock_addref_try(&olck->ols_handle, olck->ols_einfo.ei_mode);
1336 olck->ols_hold = olck->ols_has_ref = 1;
1337 olck->ols_state = OLS_GRANTED;
1339 struct cl_lock *lock;
1342 * Lock is being cancelled somewhere within
1343 * ldlm_handle_bl_callback(): LDLM_FL_CBPENDING is already
1344 * set, but osc_ldlm_blocking_ast() hasn't yet acquired
1347 lock = slice->cls_lock;
1348 LASSERT(lock->cll_state == CLS_CACHED);
1349 LASSERT(lock->cll_users > 0);
1350 LASSERT(olck->ols_lock->l_flags & LDLM_FL_CBPENDING);
1351 /* set a flag for osc_dlm_blocking_ast0() to signal the
1353 olck->ols_ast_wait = 1;
1359 static int osc_lock_flush(struct osc_lock *ols, int discard)
1361 struct cl_lock *lock = ols->ols_cl.cls_lock;
1362 struct cl_env_nest nest;
1366 env = cl_env_nested_get(&nest);
1368 result = cl_lock_page_out(env, lock, discard);
1369 cl_env_nested_put(&nest, env);
1371 result = PTR_ERR(env);
1378 * Implements cl_lock_operations::clo_cancel() method for osc layer. This is
1379 * called (as part of cl_lock_cancel()) when lock is canceled either voluntary
1380 * (LRU pressure, early cancellation, umount, etc.) or due to the conflict
1381 * with some other lock some where in the cluster. This function does the
1384 * - invalidates all pages protected by this lock (after sending dirty
1385 * ones to the server, as necessary);
1387 * - decref's underlying ldlm lock;
1389 * - cancels ldlm lock (ldlm_cli_cancel()).
1391 static void osc_lock_cancel(const struct lu_env *env,
1392 const struct cl_lock_slice *slice)
1394 struct cl_lock *lock = slice->cls_lock;
1395 struct osc_lock *olck = cl2osc_lock(slice);
1396 struct ldlm_lock *dlmlock = olck->ols_lock;
1400 LASSERT(cl_lock_is_mutexed(lock));
1401 LINVRNT(osc_lock_invariant(olck));
1403 if (dlmlock != NULL) {
1404 discard = dlmlock->l_flags & LDLM_FL_DISCARD_DATA;
1405 result = osc_lock_flush(olck, discard);
1407 osc_lock_unuse(env, slice);
1408 LASSERT(dlmlock->l_readers == 0 && dlmlock->l_writers == 0);
1409 result = ldlm_cli_cancel(&olck->ols_handle);
1411 CL_LOCK_DEBUG(D_ERROR, env, lock,
1412 "lock %p cancel failure with error(%d)\n",
1415 olck->ols_state = OLS_CANCELLED;
1416 osc_lock_detach(env, olck);
1419 void cl_lock_page_list_fixup(const struct lu_env *env,
1420 struct cl_io *io, struct cl_lock *lock,
1421 struct cl_page_list *queue);
1423 #ifdef INVARIANT_CHECK
1425 * Returns true iff there are pages under \a olck not protected by other
1428 static int osc_lock_has_pages(struct osc_lock *olck)
1430 struct cl_lock *lock;
1431 struct cl_lock_descr *descr;
1432 struct cl_object *obj;
1433 struct osc_object *oob;
1434 struct cl_page_list *plist;
1435 struct cl_page *page;
1436 struct cl_env_nest nest;
1441 env = cl_env_nested_get(&nest);
1443 obj = olck->ols_cl.cls_obj;
1445 io = &oob->oo_debug_io;
1446 lock = olck->ols_cl.cls_lock;
1447 descr = &lock->cll_descr;
1448 plist = &osc_env_info(env)->oti_plist;
1449 cl_page_list_init(plist);
1451 mutex_lock(&oob->oo_debug_mutex);
1453 io->ci_obj = cl_object_top(obj);
1454 cl_io_init(env, io, CIT_MISC, io->ci_obj);
1455 cl_page_gang_lookup(env, obj, io,
1456 descr->cld_start, descr->cld_end, plist);
1457 cl_lock_page_list_fixup(env, io, lock, plist);
1458 if (plist->pl_nr > 0) {
1459 CL_LOCK_DEBUG(D_ERROR, env, lock, "still has pages\n");
1460 cl_page_list_for_each(page, plist)
1461 CL_PAGE_DEBUG(D_ERROR, env, page, "\n");
1463 result = plist->pl_nr > 0;
1464 cl_page_list_disown(env, io, plist);
1465 cl_page_list_fini(env, plist);
1466 cl_io_fini(env, io);
1467 mutex_unlock(&oob->oo_debug_mutex);
1468 cl_env_nested_put(&nest, env);
1474 # define osc_lock_has_pages(olck) (0)
1475 #endif /* INVARIANT_CHECK */
1477 static void osc_lock_delete(const struct lu_env *env,
1478 const struct cl_lock_slice *slice)
1480 struct osc_lock *olck;
1482 olck = cl2osc_lock(slice);
1483 LINVRNT(osc_lock_invariant(olck));
1484 LINVRNT(!osc_lock_has_pages(olck));
1487 osc_lock_unuse(env, slice);
1488 osc_lock_detach(env, olck);
1492 * Implements cl_lock_operations::clo_state() method for osc layer.
1494 * Maintains osc_lock::ols_owner field.
1496 * This assumes that lock always enters CLS_HELD (from some other state) in
1497 * the same IO context as one that requested the lock. This should not be a
1498 * problem, because context is by definition shared by all activity pertaining
1499 * to the same high-level IO.
1501 static void osc_lock_state(const struct lu_env *env,
1502 const struct cl_lock_slice *slice,
1503 enum cl_lock_state state)
1505 struct osc_lock *lock = cl2osc_lock(slice);
1506 struct osc_io *oio = osc_env_io(env);
1509 * XXX multiple io contexts can use the lock at the same time.
1511 LINVRNT(osc_lock_invariant(lock));
1512 if (state == CLS_HELD && slice->cls_lock->cll_state != CLS_HELD) {
1513 LASSERT(lock->ols_owner == NULL);
1514 lock->ols_owner = oio;
1515 } else if (state != CLS_HELD)
1516 lock->ols_owner = NULL;
1519 static int osc_lock_print(const struct lu_env *env, void *cookie,
1520 lu_printer_t p, const struct cl_lock_slice *slice)
1522 struct osc_lock *lock = cl2osc_lock(slice);
1525 * XXX print ldlm lock and einfo properly.
1527 (*p)(env, cookie, "%p %08x "LPU64" %d %p ",
1528 lock->ols_lock, lock->ols_flags, lock->ols_handle.cookie,
1529 lock->ols_state, lock->ols_owner);
1530 osc_lvb_print(env, cookie, p, &lock->ols_lvb);
1534 static const struct cl_lock_operations osc_lock_ops = {
1535 .clo_fini = osc_lock_fini,
1536 .clo_enqueue = osc_lock_enqueue,
1537 .clo_wait = osc_lock_wait,
1538 .clo_unuse = osc_lock_unuse,
1539 .clo_use = osc_lock_use,
1540 .clo_delete = osc_lock_delete,
1541 .clo_state = osc_lock_state,
1542 .clo_cancel = osc_lock_cancel,
1543 .clo_weigh = osc_lock_weigh,
1544 .clo_print = osc_lock_print
1547 static int osc_lock_lockless_enqueue(const struct lu_env *env,
1548 const struct cl_lock_slice *slice,
1549 struct cl_io *_, __u32 enqflags)
1555 static int osc_lock_lockless_unuse(const struct lu_env *env,
1556 const struct cl_lock_slice *slice)
1558 struct osc_lock *ols = cl2osc_lock(slice);
1559 struct cl_lock *lock = slice->cls_lock;
1561 LASSERT(ols->ols_state == OLS_GRANTED);
1562 LINVRNT(osc_lock_invariant(ols));
1564 cl_lock_cancel(env, lock);
1565 cl_lock_delete(env, lock);
1569 static void osc_lock_lockless_cancel(const struct lu_env *env,
1570 const struct cl_lock_slice *slice)
1572 struct osc_lock *ols = cl2osc_lock(slice);
1575 result = osc_lock_flush(ols, 0);
1577 CERROR("Pages for lockless lock %p were not purged(%d)\n",
1579 ols->ols_state = OLS_CANCELLED;
1582 static int osc_lock_lockless_wait(const struct lu_env *env,
1583 const struct cl_lock_slice *slice)
1585 struct osc_lock *olck = cl2osc_lock(slice);
1586 struct cl_lock *lock = olck->ols_cl.cls_lock;
1588 LINVRNT(osc_lock_invariant(olck));
1589 LASSERT(olck->ols_state >= OLS_UPCALL_RECEIVED);
1591 return lock->cll_error;
1594 static void osc_lock_lockless_state(const struct lu_env *env,
1595 const struct cl_lock_slice *slice,
1596 enum cl_lock_state state)
1598 struct osc_lock *lock = cl2osc_lock(slice);
1599 struct osc_io *oio = osc_env_io(env);
1601 LINVRNT(osc_lock_invariant(lock));
1602 if (state == CLS_HELD) {
1603 LASSERT(lock->ols_owner == NULL);
1604 lock->ols_owner = oio;
1606 /* set the io to be lockless if this lock is for io's
1608 if (cl_object_same(oio->oi_cl.cis_obj, slice->cls_obj))
1609 oio->oi_lockless = 1;
1611 lock->ols_owner = NULL;
1614 static int osc_lock_lockless_fits_into(const struct lu_env *env,
1615 const struct cl_lock_slice *slice,
1616 const struct cl_lock_descr *need,
1617 const struct cl_io *io)
1622 static const struct cl_lock_operations osc_lock_lockless_ops = {
1623 .clo_fini = osc_lock_fini,
1624 .clo_enqueue = osc_lock_lockless_enqueue,
1625 .clo_wait = osc_lock_lockless_wait,
1626 .clo_unuse = osc_lock_lockless_unuse,
1627 .clo_state = osc_lock_lockless_state,
1628 .clo_fits_into = osc_lock_lockless_fits_into,
1629 .clo_cancel = osc_lock_lockless_cancel,
1630 .clo_print = osc_lock_print
1633 int osc_lock_init(const struct lu_env *env,
1634 struct cl_object *obj, struct cl_lock *lock,
1635 const struct cl_io *_)
1637 struct osc_lock *clk;
1640 OBD_SLAB_ALLOC_PTR_GFP(clk, osc_lock_kmem, CFS_ALLOC_IO);
1642 osc_lock_build_einfo(env, lock, clk, &clk->ols_einfo);
1643 clk->ols_state = OLS_NEW;
1644 cl_lock_slice_add(lock, &clk->ols_cl, obj, &osc_lock_ops);