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) 2017, Intel Corporation.
26 * This file is part of Lustre, http://www.lustre.org/
28 * Implementation of cl_device, cl_req for MDC layer.
30 * Author: Mikhail Pershin <mike.pershin@intel.com>
33 #define DEBUG_SUBSYSTEM S_MDC
35 #include <obd_class.h>
36 #include <lustre_osc.h>
38 #include "mdc_internal.h"
40 static void mdc_lock_build_policy(const struct lu_env *env,
41 union ldlm_policy_data *policy)
43 memset(policy, 0, sizeof *policy);
44 policy->l_inodebits.bits = MDS_INODELOCK_DOM;
47 int mdc_ldlm_glimpse_ast(struct ldlm_lock *dlmlock, void *data)
49 return osc_ldlm_glimpse_ast(dlmlock, data);
52 static void mdc_lock_build_einfo(const struct lu_env *env,
53 const struct cl_lock *lock,
54 struct osc_object *osc,
55 struct ldlm_enqueue_info *einfo)
57 einfo->ei_type = LDLM_IBITS;
58 einfo->ei_mode = osc_cl_lock2ldlm(lock->cll_descr.cld_mode);
59 einfo->ei_cb_bl = mdc_ldlm_blocking_ast;
60 einfo->ei_cb_cp = ldlm_completion_ast;
61 einfo->ei_cb_gl = mdc_ldlm_glimpse_ast;
62 einfo->ei_cbdata = osc; /* value to be put into ->l_ast_data */
65 static void mdc_lock_lvb_update(const struct lu_env *env,
66 struct osc_object *osc,
67 struct ldlm_lock *dlmlock,
70 static int mdc_set_dom_lock_data(const struct lu_env *env,
71 struct ldlm_lock *lock, void *data)
73 struct osc_object *obj = data;
76 LASSERT(lock != NULL);
77 LASSERT(lock->l_glimpse_ast == mdc_ldlm_glimpse_ast);
79 lock_res_and_lock(lock);
80 if (lock->l_ast_data == NULL) {
81 lock->l_ast_data = data;
82 mdc_lock_lvb_update(env, obj, lock, NULL);
85 if (lock->l_ast_data == data)
88 unlock_res_and_lock(lock);
93 int mdc_dom_lock_match(const struct lu_env *env, struct obd_export *exp,
94 struct ldlm_res_id *res_id,
95 enum ldlm_type type, union ldlm_policy_data *policy,
96 enum ldlm_mode mode, __u64 *flags, void *data,
97 struct lustre_handle *lockh, int unref)
99 struct obd_device *obd = exp->exp_obd;
100 __u64 lflags = *flags;
105 rc = ldlm_lock_match(obd->obd_namespace, lflags,
106 res_id, type, policy, mode, lockh, unref);
107 if (rc == 0 || lflags & LDLM_FL_TEST_LOCK)
111 struct ldlm_lock *lock = ldlm_handle2lock(lockh);
113 LASSERT(lock != NULL);
114 if (!mdc_set_dom_lock_data(env, lock, data)) {
115 ldlm_lock_decref(lockh, rc);
124 * Finds an existing lock covering a page with given index.
125 * Copy of osc_obj_dlmlock_at_pgoff() but for DoM IBITS lock.
127 struct ldlm_lock *mdc_dlmlock_at_pgoff(const struct lu_env *env,
128 struct osc_object *obj, pgoff_t index,
129 enum osc_dap_flags dap_flags)
131 struct osc_thread_info *info = osc_env_info(env);
132 struct ldlm_res_id *resname = &info->oti_resname;
133 union ldlm_policy_data *policy = &info->oti_policy;
134 struct lustre_handle lockh;
135 struct ldlm_lock *lock = NULL;
141 fid_build_reg_res_name(lu_object_fid(osc2lu(obj)), resname);
142 mdc_lock_build_policy(env, policy);
144 flags = LDLM_FL_BLOCK_GRANTED | LDLM_FL_CBPENDING;
145 if (dap_flags & OSC_DAP_FL_TEST_LOCK)
146 flags |= LDLM_FL_TEST_LOCK;
149 /* Next, search for already existing extent locks that will cover us */
150 /* If we're trying to read, we also search for an existing PW lock. The
151 * VFS and page cache already protect us locally, so lots of readers/
152 * writers can share a single PW lock. */
153 mode = mdc_dom_lock_match(env, osc_export(obj), resname, LDLM_IBITS,
154 policy, LCK_PR | LCK_PW | LCK_GROUP, &flags,
156 dap_flags & OSC_DAP_FL_CANCELING);
158 lock = ldlm_handle2lock(&lockh);
159 /* RACE: the lock is cancelled so let's try again */
160 if (unlikely(lock == NULL))
168 * Check if page @page is covered by an extra lock or discard it.
170 static int mdc_check_and_discard_cb(const struct lu_env *env, struct cl_io *io,
171 struct osc_page *ops, void *cbdata)
173 struct osc_thread_info *info = osc_env_info(env);
174 struct osc_object *osc = cbdata;
177 index = osc_index(ops);
178 if (index >= info->oti_fn_index) {
179 struct ldlm_lock *tmp;
180 struct cl_page *page = ops->ops_cl.cpl_page;
182 /* refresh non-overlapped index */
183 tmp = mdc_dlmlock_at_pgoff(env, osc, index,
184 OSC_DAP_FL_TEST_LOCK);
186 info->oti_fn_index = CL_PAGE_EOF;
188 } else if (cl_page_own(env, io, page) == 0) {
189 /* discard the page */
190 cl_page_discard(env, io, page);
191 cl_page_disown(env, io, page);
193 LASSERT(page->cp_state == CPS_FREEING);
197 info->oti_next_index = index + 1;
198 return CLP_GANG_OKAY;
202 * Discard pages protected by the given lock. This function traverses radix
203 * tree to find all covering pages and discard them. If a page is being covered
204 * by other locks, it should remain in cache.
206 * If error happens on any step, the process continues anyway (the reasoning
207 * behind this being that lock cancellation cannot be delayed indefinitely).
209 static int mdc_lock_discard_pages(const struct lu_env *env,
210 struct osc_object *osc,
211 pgoff_t start, pgoff_t end,
214 struct osc_thread_info *info = osc_env_info(env);
215 struct cl_io *io = &info->oti_io;
216 osc_page_gang_cbt cb;
222 io->ci_obj = cl_object_top(osc2cl(osc));
223 io->ci_ignore_layout = 1;
224 result = cl_io_init(env, io, CIT_MISC, io->ci_obj);
228 cb = discard ? osc_discard_cb : mdc_check_and_discard_cb;
229 info->oti_fn_index = info->oti_next_index = start;
231 res = osc_page_gang_lookup(env, io, osc, info->oti_next_index,
232 end, cb, (void *)osc);
233 if (info->oti_next_index > end)
236 if (res == CLP_GANG_RESCHED)
238 } while (res != CLP_GANG_OKAY);
244 static int mdc_lock_flush(const struct lu_env *env, struct osc_object *obj,
245 pgoff_t start, pgoff_t end, enum cl_lock_mode mode,
253 if (mode == CLM_WRITE) {
254 result = osc_cache_writeback_range(env, obj, start, end, 1,
256 CDEBUG(D_CACHE, "object %p: [%lu -> %lu] %d pages were %s.\n",
257 obj, start, end, result,
258 discard ? "discarded" : "written back");
263 rc = mdc_lock_discard_pages(env, obj, start, end, discard);
264 if (result == 0 && rc < 0)
270 void mdc_lock_lockless_cancel(const struct lu_env *env,
271 const struct cl_lock_slice *slice)
273 struct osc_lock *ols = cl2osc_lock(slice);
274 struct osc_object *osc = cl2osc(slice->cls_obj);
275 struct cl_lock_descr *descr = &slice->cls_lock->cll_descr;
278 LASSERT(ols->ols_dlmlock == NULL);
279 rc = mdc_lock_flush(env, osc, descr->cld_start, descr->cld_end,
282 CERROR("Pages for lockless lock %p were not purged(%d)\n",
285 osc_lock_wake_waiters(env, osc, ols);
289 * Helper for osc_dlm_blocking_ast() handling discrepancies between cl_lock
290 * and ldlm_lock caches.
292 static int mdc_dlm_blocking_ast0(const struct lu_env *env,
293 struct ldlm_lock *dlmlock,
294 void *data, int flag)
296 struct cl_object *obj = NULL;
299 enum cl_lock_mode mode = CLM_READ;
303 LASSERT(flag == LDLM_CB_CANCELING);
304 LASSERT(dlmlock != NULL);
306 lock_res_and_lock(dlmlock);
307 if (dlmlock->l_granted_mode != dlmlock->l_req_mode) {
308 dlmlock->l_ast_data = NULL;
309 unlock_res_and_lock(dlmlock);
313 discard = ldlm_is_discard_data(dlmlock);
314 if (dlmlock->l_granted_mode & (LCK_PW | LCK_GROUP))
317 if (dlmlock->l_ast_data != NULL) {
318 obj = osc2cl(dlmlock->l_ast_data);
319 dlmlock->l_ast_data = NULL;
322 ldlm_set_kms_ignore(dlmlock);
323 unlock_res_and_lock(dlmlock);
325 /* if l_ast_data is NULL, the dlmlock was enqueued by AGL or
326 * the object has been destroyed. */
328 struct cl_attr *attr = &osc_env_info(env)->oti_attr;
330 /* Destroy pages covered by the extent of the DLM lock */
331 result = mdc_lock_flush(env, cl2osc(obj), cl_index(obj, 0),
332 CL_PAGE_EOF, mode, discard);
333 /* Losing a lock, set KMS to 0.
334 * NB: assumed that DOM lock covers whole data on MDT.
336 /* losing a lock, update kms */
337 lock_res_and_lock(dlmlock);
338 cl_object_attr_lock(obj);
340 cl_object_attr_update(env, obj, attr, CAT_KMS);
341 cl_object_attr_unlock(obj);
342 unlock_res_and_lock(dlmlock);
343 cl_object_put(env, obj);
348 int mdc_ldlm_blocking_ast(struct ldlm_lock *dlmlock,
349 struct ldlm_lock_desc *new, void *data, int flag)
356 case LDLM_CB_BLOCKING: {
357 struct lustre_handle lockh;
359 ldlm_lock2handle(dlmlock, &lockh);
360 rc = ldlm_cli_cancel(&lockh, LCF_ASYNC);
365 case LDLM_CB_CANCELING: {
370 * This can be called in the context of outer IO, e.g.,
372 * osc_enqueue_base()->...
373 * ->ldlm_prep_elc_req()->...
374 * ->ldlm_cancel_callback()->...
375 * ->osc_ldlm_blocking_ast()
377 * new environment has to be created to not corrupt outer
380 env = cl_env_get(&refcheck);
386 rc = mdc_dlm_blocking_ast0(env, dlmlock, data, flag);
387 cl_env_put(env, &refcheck);
397 * Updates object attributes from a lock value block (lvb) received together
398 * with the DLM lock reply from the server.
399 * This can be optimized to not update attributes when lock is a result of a
402 * Called under lock and resource spin-locks.
404 void mdc_lock_lvb_update(const struct lu_env *env, struct osc_object *osc,
405 struct ldlm_lock *dlmlock, struct ost_lvb *lvb)
407 struct cl_object *obj = osc2cl(osc);
408 struct lov_oinfo *oinfo = osc->oo_oinfo;
409 struct cl_attr *attr = &osc_env_info(env)->oti_attr;
410 unsigned valid = CAT_BLOCKS | CAT_ATIME | CAT_CTIME | CAT_MTIME |
416 LASSERT(dlmlock != NULL);
417 lvb = &dlmlock->l_ost_lvb;
419 cl_lvb2attr(attr, lvb);
421 cl_object_attr_lock(obj);
422 if (dlmlock != NULL) {
425 check_res_locked(dlmlock->l_resource);
426 size = lvb->lvb_size;
428 if (size >= oinfo->loi_kms) {
429 LDLM_DEBUG(dlmlock, "lock acquired, setting rss=%llu,"
430 " kms=%llu", lvb->lvb_size, size);
432 attr->cat_kms = size;
434 LDLM_DEBUG(dlmlock, "lock acquired, setting rss=%llu,"
436 lvb->lvb_size, oinfo->loi_kms);
439 cl_object_attr_update(env, obj, attr, valid);
440 cl_object_attr_unlock(obj);
444 static void mdc_lock_granted(const struct lu_env *env, struct osc_lock *oscl,
445 struct lustre_handle *lockh, bool lvb_update)
447 struct ldlm_lock *dlmlock;
451 dlmlock = ldlm_handle2lock_long(lockh, 0);
452 LASSERT(dlmlock != NULL);
454 /* lock reference taken by ldlm_handle2lock_long() is
455 * owned by osc_lock and released in osc_lock_detach()
457 lu_ref_add(&dlmlock->l_reference, "osc_lock", oscl);
458 oscl->ols_has_ref = 1;
460 LASSERT(oscl->ols_dlmlock == NULL);
461 oscl->ols_dlmlock = dlmlock;
463 /* This may be a matched lock for glimpse request, do not hold
464 * lock reference in that case. */
465 if (!oscl->ols_glimpse) {
466 /* hold a refc for non glimpse lock which will
467 * be released in osc_lock_cancel() */
468 lustre_handle_copy(&oscl->ols_handle, lockh);
469 ldlm_lock_addref(lockh, oscl->ols_einfo.ei_mode);
473 /* Lock must have been granted. */
474 lock_res_and_lock(dlmlock);
475 if (dlmlock->l_granted_mode == dlmlock->l_req_mode) {
476 struct cl_lock_descr *descr = &oscl->ols_cl.cls_lock->cll_descr;
478 /* extend the lock extent, otherwise it will have problem when
479 * we decide whether to grant a lockless lock. */
480 descr->cld_mode = osc_ldlm2cl_lock(dlmlock->l_granted_mode);
481 descr->cld_start = cl_index(descr->cld_obj, 0);
482 descr->cld_end = CL_PAGE_EOF;
484 /* no lvb update for matched lock */
486 LASSERT(oscl->ols_flags & LDLM_FL_LVB_READY);
487 mdc_lock_lvb_update(env, cl2osc(oscl->ols_cl.cls_obj),
491 unlock_res_and_lock(dlmlock);
493 LASSERT(oscl->ols_state != OLS_GRANTED);
494 oscl->ols_state = OLS_GRANTED;
499 * Lock upcall function that is executed either when a reply to ENQUEUE rpc is
500 * received from a server, or after osc_enqueue_base() matched a local DLM
503 static int mdc_lock_upcall(void *cookie, struct lustre_handle *lockh,
506 struct osc_lock *oscl = cookie;
507 struct cl_lock_slice *slice = &oscl->ols_cl;
513 env = cl_env_percpu_get();
514 /* should never happen, similar to osc_ldlm_blocking_ast(). */
515 LASSERT(!IS_ERR(env));
517 rc = ldlm_error2errno(errcode);
518 if (oscl->ols_state == OLS_ENQUEUED) {
519 oscl->ols_state = OLS_UPCALL_RECEIVED;
520 } else if (oscl->ols_state == OLS_CANCELLED) {
523 CERROR("Impossible state: %d\n", oscl->ols_state);
527 CDEBUG(D_INODE, "rc %d, err %d\n", rc, errcode);
529 mdc_lock_granted(env, oscl, lockh, errcode == ELDLM_OK);
531 /* Error handling, some errors are tolerable. */
532 if (oscl->ols_locklessable && rc == -EUSERS) {
533 /* This is a tolerable error, turn this lock into
536 osc_object_set_contended(cl2osc(slice->cls_obj));
537 LASSERT(slice->cls_ops != oscl->ols_lockless_ops);
539 /* Change this lock to ldlmlock-less lock. */
540 osc_lock_to_lockless(env, oscl, 1);
541 oscl->ols_state = OLS_GRANTED;
543 } else if (oscl->ols_glimpse && rc == -ENAVAIL) {
544 LASSERT(oscl->ols_flags & LDLM_FL_LVB_READY);
545 mdc_lock_lvb_update(env, cl2osc(slice->cls_obj),
546 NULL, &oscl->ols_lvb);
547 /* Hide the error. */
551 if (oscl->ols_owner != NULL)
552 cl_sync_io_note(env, oscl->ols_owner, rc);
553 cl_env_percpu_put(env);
558 int mdc_fill_lvb(struct ptlrpc_request *req, struct ost_lvb *lvb)
560 struct mdt_body *body;
562 body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
566 lvb->lvb_mtime = body->mbo_mtime;
567 lvb->lvb_atime = body->mbo_atime;
568 lvb->lvb_ctime = body->mbo_ctime;
569 lvb->lvb_blocks = body->mbo_dom_blocks;
570 lvb->lvb_size = body->mbo_dom_size;
575 int mdc_enqueue_fini(struct ptlrpc_request *req, osc_enqueue_upcall_f upcall,
576 void *cookie, struct lustre_handle *lockh,
577 enum ldlm_mode mode, __u64 *flags, int errcode)
579 struct osc_lock *ols = cookie;
580 struct ldlm_lock *lock;
585 /* The request was created before ldlm_cli_enqueue call. */
586 if (errcode == ELDLM_LOCK_ABORTED) {
587 struct ldlm_reply *rep;
589 rep = req_capsule_server_get(&req->rq_pill, &RMF_DLM_REP);
590 LASSERT(rep != NULL);
592 rep->lock_policy_res2 =
593 ptlrpc_status_ntoh(rep->lock_policy_res2);
594 if (rep->lock_policy_res2)
595 errcode = rep->lock_policy_res2;
597 rc = mdc_fill_lvb(req, &ols->ols_lvb);
598 *flags |= LDLM_FL_LVB_READY;
599 } else if (errcode == ELDLM_OK) {
600 /* Callers have references, should be valid always */
601 lock = ldlm_handle2lock(lockh);
604 rc = mdc_fill_lvb(req, &lock->l_ost_lvb);
606 *flags |= LDLM_FL_LVB_READY;
609 /* Call the update callback. */
610 rc = (*upcall)(cookie, lockh, rc < 0 ? rc : errcode);
612 /* release the reference taken in ldlm_cli_enqueue() */
613 if (errcode == ELDLM_LOCK_MATCHED)
615 if (errcode == ELDLM_OK && lustre_handle_is_used(lockh))
616 ldlm_lock_decref(lockh, mode);
621 int mdc_enqueue_interpret(const struct lu_env *env, struct ptlrpc_request *req,
622 struct osc_enqueue_args *aa, int rc)
624 struct ldlm_lock *lock;
625 struct lustre_handle *lockh = &aa->oa_lockh;
626 enum ldlm_mode mode = aa->oa_mode;
630 LASSERT(!aa->oa_speculative);
632 /* ldlm_cli_enqueue is holding a reference on the lock, so it must
634 lock = ldlm_handle2lock(lockh);
635 LASSERTF(lock != NULL,
636 "lockh %#llx, req %p, aa %p - client evicted?\n",
637 lockh->cookie, req, aa);
639 /* Take an additional reference so that a blocking AST that
640 * ldlm_cli_enqueue_fini() might post for a failed lock, is guaranteed
641 * to arrive after an upcall has been executed by
642 * osc_enqueue_fini(). */
643 ldlm_lock_addref(lockh, mode);
645 /* Let cl_lock_state_wait fail with -ERESTARTSYS to unuse sublocks. */
646 OBD_FAIL_TIMEOUT(OBD_FAIL_LDLM_ENQUEUE_HANG, 2);
648 /* Let CP AST to grant the lock first. */
649 OBD_FAIL_TIMEOUT(OBD_FAIL_OSC_CP_ENQ_RACE, 1);
651 /* Complete obtaining the lock procedure. */
652 rc = ldlm_cli_enqueue_fini(aa->oa_exp, req, aa->oa_type, 1,
653 aa->oa_mode, aa->oa_flags, NULL, 0,
655 /* Complete mdc stuff. */
656 rc = mdc_enqueue_fini(req, aa->oa_upcall, aa->oa_cookie, lockh, mode,
659 OBD_FAIL_TIMEOUT(OBD_FAIL_OSC_CP_CANCEL_RACE, 10);
661 ldlm_lock_decref(lockh, mode);
666 /* When enqueuing asynchronously, locks are not ordered, we can obtain a lock
667 * from the 2nd OSC before a lock from the 1st one. This does not deadlock with
668 * other synchronous requests, however keeping some locks and trying to obtain
669 * others may take a considerable amount of time in a case of ost failure; and
670 * when other sync requests do not get released lock from a client, the client
671 * is excluded from the cluster -- such scenarious make the life difficult, so
672 * release locks just after they are obtained. */
673 int mdc_enqueue_send(const struct lu_env *env, struct obd_export *exp,
674 struct ldlm_res_id *res_id, __u64 *flags,
675 union ldlm_policy_data *policy,
676 struct ost_lvb *lvb, int kms_valid,
677 osc_enqueue_upcall_f upcall, void *cookie,
678 struct ldlm_enqueue_info *einfo, int async)
680 struct obd_device *obd = exp->exp_obd;
681 struct lustre_handle lockh = { 0 };
682 struct ptlrpc_request *req = NULL;
683 struct ldlm_intent *lit;
685 bool glimpse = *flags & LDLM_FL_HAS_INTENT;
686 __u64 match_flags = *flags;
691 mode = einfo->ei_mode;
692 if (einfo->ei_mode == LCK_PR)
696 match_flags |= LDLM_FL_BLOCK_GRANTED;
697 mode = ldlm_lock_match(obd->obd_namespace, match_flags, res_id,
698 einfo->ei_type, policy, mode, &lockh, 0);
700 struct ldlm_lock *matched;
702 if (*flags & LDLM_FL_TEST_LOCK)
705 matched = ldlm_handle2lock(&lockh);
706 if (!matched || ldlm_is_kms_ignore(matched))
709 if (mdc_set_dom_lock_data(env, matched, einfo->ei_cbdata)) {
710 *flags |= LDLM_FL_LVB_READY;
712 /* We already have a lock, and it's referenced. */
713 (*upcall)(cookie, &lockh, ELDLM_LOCK_MATCHED);
715 ldlm_lock_decref(&lockh, mode);
716 LDLM_LOCK_PUT(matched);
720 ldlm_lock_decref(&lockh, mode);
721 LDLM_LOCK_PUT(matched);
724 if (*flags & (LDLM_FL_TEST_LOCK | LDLM_FL_MATCH_LOCK))
727 req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_LDLM_INTENT);
731 rc = ldlm_prep_enqueue_req(exp, req, NULL, 0);
733 ptlrpc_request_free(req);
737 /* pack the intent */
738 lit = req_capsule_client_get(&req->rq_pill, &RMF_LDLM_INTENT);
739 lit->opc = glimpse ? IT_GLIMPSE : IT_BRW;
741 req_capsule_set_size(&req->rq_pill, &RMF_MDT_MD, RCL_SERVER, 0);
742 req_capsule_set_size(&req->rq_pill, &RMF_ACL, RCL_SERVER, 0);
743 ptlrpc_request_set_replen(req);
745 /* users of mdc_enqueue() can pass this flag for ldlm_lock_match() */
746 *flags &= ~LDLM_FL_BLOCK_GRANTED;
747 /* All MDC IO locks are intents */
748 *flags |= LDLM_FL_HAS_INTENT;
749 rc = ldlm_cli_enqueue(exp, &req, einfo, res_id, policy, flags, NULL,
750 0, LVB_T_NONE, &lockh, async);
753 struct osc_enqueue_args *aa;
755 CLASSERT(sizeof(*aa) <= sizeof(req->rq_async_args));
756 aa = ptlrpc_req_async_args(req);
758 aa->oa_mode = einfo->ei_mode;
759 aa->oa_type = einfo->ei_type;
760 lustre_handle_copy(&aa->oa_lockh, &lockh);
761 aa->oa_upcall = upcall;
762 aa->oa_cookie = cookie;
763 aa->oa_speculative = false;
764 aa->oa_flags = flags;
767 req->rq_interpret_reply =
768 (ptlrpc_interpterer_t)mdc_enqueue_interpret;
769 ptlrpcd_add_req(req);
771 ptlrpc_req_finished(req);
776 rc = mdc_enqueue_fini(req, upcall, cookie, &lockh, einfo->ei_mode,
778 ptlrpc_req_finished(req);
783 * Implementation of cl_lock_operations::clo_enqueue() method for osc
784 * layer. This initiates ldlm enqueue:
786 * - cancels conflicting locks early (osc_lock_enqueue_wait());
788 * - calls osc_enqueue_base() to do actual enqueue.
790 * osc_enqueue_base() is supplied with an upcall function that is executed
791 * when lock is received either after a local cached ldlm lock is matched, or
792 * when a reply from the server is received.
794 * This function does not wait for the network communication to complete.
796 static int mdc_lock_enqueue(const struct lu_env *env,
797 const struct cl_lock_slice *slice,
798 struct cl_io *unused, struct cl_sync_io *anchor)
800 struct osc_thread_info *info = osc_env_info(env);
801 struct osc_io *oio = osc_env_io(env);
802 struct osc_object *osc = cl2osc(slice->cls_obj);
803 struct osc_lock *oscl = cl2osc_lock(slice);
804 struct cl_lock *lock = slice->cls_lock;
805 struct ldlm_res_id *resname = &info->oti_resname;
806 union ldlm_policy_data *policy = &info->oti_policy;
807 osc_enqueue_upcall_f upcall = mdc_lock_upcall;
808 void *cookie = (void *)oscl;
814 LASSERTF(ergo(oscl->ols_glimpse, lock->cll_descr.cld_mode <= CLM_READ),
815 "lock = %p, ols = %p\n", lock, oscl);
817 if (oscl->ols_state == OLS_GRANTED)
820 /* Lockahead is not supported on MDT yet */
821 if (oscl->ols_flags & LDLM_FL_NO_EXPANSION) {
822 result = -EOPNOTSUPP;
826 if (oscl->ols_flags & LDLM_FL_TEST_LOCK)
827 GOTO(enqueue_base, 0);
829 if (oscl->ols_glimpse) {
830 LASSERT(equi(oscl->ols_speculative, anchor == NULL));
832 GOTO(enqueue_base, 0);
835 result = osc_lock_enqueue_wait(env, osc, oscl);
839 /* we can grant lockless lock right after all conflicting locks
841 if (osc_lock_is_lockless(oscl)) {
842 oscl->ols_state = OLS_GRANTED;
843 oio->oi_lockless = 1;
848 oscl->ols_state = OLS_ENQUEUED;
849 if (anchor != NULL) {
850 atomic_inc(&anchor->csi_sync_nr);
851 oscl->ols_owner = anchor;
855 * DLM lock's ast data must be osc_object;
856 * DLM's enqueue callback set to osc_lock_upcall() with cookie as
859 fid_build_reg_res_name(lu_object_fid(osc2lu(osc)), resname);
860 mdc_lock_build_policy(env, policy);
861 LASSERT(!oscl->ols_speculative);
862 result = mdc_enqueue_send(env, osc_export(osc), resname,
863 &oscl->ols_flags, policy,
864 &oscl->ols_lvb, osc->oo_oinfo->loi_kms_valid,
865 upcall, cookie, &oscl->ols_einfo, async);
867 if (osc_lock_is_lockless(oscl)) {
868 oio->oi_lockless = 1;
870 LASSERT(oscl->ols_state == OLS_GRANTED);
871 LASSERT(oscl->ols_hold);
872 LASSERT(oscl->ols_dlmlock != NULL);
877 oscl->ols_state = OLS_CANCELLED;
878 osc_lock_wake_waiters(env, osc, oscl);
881 cl_sync_io_note(env, anchor, result);
886 static const struct cl_lock_operations mdc_lock_lockless_ops = {
887 .clo_fini = osc_lock_fini,
888 .clo_enqueue = mdc_lock_enqueue,
889 .clo_cancel = mdc_lock_lockless_cancel,
890 .clo_print = osc_lock_print
893 static const struct cl_lock_operations mdc_lock_ops = {
894 .clo_fini = osc_lock_fini,
895 .clo_enqueue = mdc_lock_enqueue,
896 .clo_cancel = osc_lock_cancel,
897 .clo_print = osc_lock_print,
900 int mdc_lock_init(const struct lu_env *env, struct cl_object *obj,
901 struct cl_lock *lock, const struct cl_io *io)
903 struct osc_lock *ols;
904 __u32 enqflags = lock->cll_descr.cld_enq_flags;
905 __u64 flags = osc_enq2ldlm_flags(enqflags);
909 /* Ignore AGL for Data-on-MDT, stat returns size data */
910 if ((enqflags & CEF_SPECULATIVE) != 0)
913 OBD_SLAB_ALLOC_PTR_GFP(ols, osc_lock_kmem, GFP_NOFS);
914 if (unlikely(ols == NULL))
917 ols->ols_state = OLS_NEW;
918 spin_lock_init(&ols->ols_lock);
919 INIT_LIST_HEAD(&ols->ols_waiting_list);
920 INIT_LIST_HEAD(&ols->ols_wait_entry);
921 INIT_LIST_HEAD(&ols->ols_nextlock_oscobj);
922 ols->ols_lockless_ops = &mdc_lock_lockless_ops;
924 ols->ols_flags = flags;
925 ols->ols_speculative = !!(enqflags & CEF_SPECULATIVE);
927 if (ols->ols_flags & LDLM_FL_HAS_INTENT) {
928 ols->ols_flags |= LDLM_FL_BLOCK_GRANTED;
929 ols->ols_glimpse = 1;
931 mdc_lock_build_einfo(env, lock, cl2osc(obj), &ols->ols_einfo);
933 cl_lock_slice_add(lock, &ols->ols_cl, obj, &mdc_lock_ops);
935 if (!(enqflags & CEF_MUST))
936 osc_lock_to_lockless(env, ols, (enqflags & CEF_NEVER));
937 if (ols->ols_locklessable && !(enqflags & CEF_DISCARD_DATA))
938 ols->ols_flags |= LDLM_FL_DENY_ON_CONTENTION;
940 if (io->ci_type == CIT_WRITE || cl_io_is_mkwrite(io))
941 osc_lock_set_writer(env, io, obj, ols);
943 LDLM_DEBUG_NOLOCK("lock %p, mdc lock %p, flags %llx\n",
944 lock, ols, ols->ols_flags);
951 * An implementation of cl_io_operations specific methods for MDC layer.
954 static int mdc_async_upcall(void *a, int rc)
956 struct osc_async_cbargs *args = a;
959 complete(&args->opc_sync);
963 static int mdc_get_lock_handle(const struct lu_env *env, struct osc_object *osc,
964 pgoff_t index, struct lustre_handle *lh)
966 struct ldlm_lock *lock;
968 /* find DOM lock protecting object */
969 lock = mdc_dlmlock_at_pgoff(env, osc, index,
970 OSC_DAP_FL_TEST_LOCK |
971 OSC_DAP_FL_CANCELING);
973 struct ldlm_resource *res;
974 struct ldlm_res_id *resname;
976 resname = &osc_env_info(env)->oti_resname;
977 fid_build_reg_res_name(lu_object_fid(osc2lu(osc)), resname);
978 res = ldlm_resource_get(osc_export(osc)->exp_obd->obd_namespace,
979 NULL, resname, LDLM_IBITS, 0);
980 ldlm_resource_dump(D_ERROR, res);
981 libcfs_debug_dumpstack(NULL);
984 *lh = lock->l_remote_handle;
990 static int mdc_io_setattr_start(const struct lu_env *env,
991 const struct cl_io_slice *slice)
993 struct cl_io *io = slice->cis_io;
994 struct osc_io *oio = cl2osc_io(env, slice);
995 struct cl_object *obj = slice->cis_obj;
996 struct lov_oinfo *loi = cl2osc(obj)->oo_oinfo;
997 struct cl_attr *attr = &osc_env_info(env)->oti_attr;
998 struct obdo *oa = &oio->oi_oa;
999 struct osc_async_cbargs *cbargs = &oio->oi_cbarg;
1000 __u64 size = io->u.ci_setattr.sa_attr.lvb_size;
1001 unsigned int ia_valid = io->u.ci_setattr.sa_valid;
1004 /* silently ignore non-truncate setattr for Data-on-MDT object */
1005 if (cl_io_is_trunc(io)) {
1006 /* truncate cache dirty pages first */
1007 rc = osc_cache_truncate_start(env, cl2osc(obj), size,
1013 if (oio->oi_lockless == 0) {
1014 cl_object_attr_lock(obj);
1015 rc = cl_object_attr_get(env, obj, attr);
1017 struct ost_lvb *lvb = &io->u.ci_setattr.sa_attr;
1018 unsigned int cl_valid = 0;
1020 if (ia_valid & ATTR_SIZE) {
1021 attr->cat_size = attr->cat_kms = size;
1022 cl_valid = (CAT_SIZE | CAT_KMS);
1024 if (ia_valid & ATTR_MTIME_SET) {
1025 attr->cat_mtime = lvb->lvb_mtime;
1026 cl_valid |= CAT_MTIME;
1028 if (ia_valid & ATTR_ATIME_SET) {
1029 attr->cat_atime = lvb->lvb_atime;
1030 cl_valid |= CAT_ATIME;
1032 if (ia_valid & ATTR_CTIME_SET) {
1033 attr->cat_ctime = lvb->lvb_ctime;
1034 cl_valid |= CAT_CTIME;
1036 rc = cl_object_attr_update(env, obj, attr, cl_valid);
1038 cl_object_attr_unlock(obj);
1043 if (!(ia_valid & ATTR_SIZE))
1046 memset(oa, 0, sizeof(*oa));
1047 oa->o_oi = loi->loi_oi;
1048 oa->o_mtime = attr->cat_mtime;
1049 oa->o_atime = attr->cat_atime;
1050 oa->o_ctime = attr->cat_ctime;
1053 oa->o_blocks = OBD_OBJECT_EOF;
1054 oa->o_valid = OBD_MD_FLID | OBD_MD_FLGROUP | OBD_MD_FLATIME |
1055 OBD_MD_FLCTIME | OBD_MD_FLMTIME | OBD_MD_FLSIZE |
1057 if (oio->oi_lockless) {
1058 oa->o_flags = OBD_FL_SRVLOCK;
1059 oa->o_valid |= OBD_MD_FLFLAGS;
1061 rc = mdc_get_lock_handle(env, cl2osc(obj), CL_PAGE_EOF,
1064 oa->o_valid |= OBD_MD_FLHANDLE;
1067 init_completion(&cbargs->opc_sync);
1069 rc = osc_punch_send(osc_export(cl2osc(obj)), oa,
1070 mdc_async_upcall, cbargs);
1071 cbargs->opc_rpc_sent = rc == 0;
1075 static int mdc_io_read_ahead(const struct lu_env *env,
1076 const struct cl_io_slice *ios,
1077 pgoff_t start, struct cl_read_ahead *ra)
1079 struct osc_object *osc = cl2osc(ios->cis_obj);
1080 struct ldlm_lock *dlmlock;
1084 dlmlock = mdc_dlmlock_at_pgoff(env, osc, start, 0);
1085 if (dlmlock == NULL)
1088 if (dlmlock->l_req_mode != LCK_PR) {
1089 struct lustre_handle lockh;
1091 ldlm_lock2handle(dlmlock, &lockh);
1092 ldlm_lock_addref(&lockh, LCK_PR);
1093 ldlm_lock_decref(&lockh, dlmlock->l_req_mode);
1096 ra->cra_rpc_size = osc_cli(osc)->cl_max_pages_per_rpc;
1097 ra->cra_end = CL_PAGE_EOF;
1098 ra->cra_release = osc_read_ahead_release;
1099 ra->cra_cbdata = dlmlock;
1104 int mdc_io_fsync_start(const struct lu_env *env,
1105 const struct cl_io_slice *slice)
1107 struct cl_io *io = slice->cis_io;
1108 struct cl_fsync_io *fio = &io->u.ci_fsync;
1109 struct cl_object *obj = slice->cis_obj;
1110 struct osc_object *osc = cl2osc(obj);
1115 /* a MDC lock always covers whole object, do sync for whole
1116 * possible range despite of supplied start/end values.
1118 result = osc_cache_writeback_range(env, osc, 0, CL_PAGE_EOF, 0,
1119 fio->fi_mode == CL_FSYNC_DISCARD);
1121 fio->fi_nr_written += result;
1124 if (fio->fi_mode == CL_FSYNC_ALL) {
1127 rc = osc_cache_wait_range(env, osc, 0, CL_PAGE_EOF);
1130 /* Use OSC sync code because it is asynchronous.
1131 * It is to be added into MDC and avoid the using of
1132 * OST_SYNC at both MDC and MDT.
1134 rc = osc_fsync_ost(env, osc, fio);
1142 struct mdc_data_version_args {
1143 struct osc_io *dva_oio;
1147 mdc_data_version_interpret(const struct lu_env *env, struct ptlrpc_request *req,
1150 struct mdc_data_version_args *dva = arg;
1151 struct osc_io *oio = dva->dva_oio;
1152 const struct mdt_body *body;
1158 body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
1160 GOTO(out, rc = -EPROTO);
1162 /* Prepare OBDO from mdt_body for CLIO */
1163 oio->oi_oa.o_valid = body->mbo_valid;
1164 oio->oi_oa.o_flags = body->mbo_flags;
1165 oio->oi_oa.o_data_version = body->mbo_version;
1166 oio->oi_oa.o_layout_version = body->mbo_layout_gen;
1169 oio->oi_cbarg.opc_rc = rc;
1170 complete(&oio->oi_cbarg.opc_sync);
1174 static int mdc_io_data_version_start(const struct lu_env *env,
1175 const struct cl_io_slice *slice)
1177 struct cl_data_version_io *dv = &slice->cis_io->u.ci_data_version;
1178 struct osc_io *oio = cl2osc_io(env, slice);
1179 struct osc_async_cbargs *cbargs = &oio->oi_cbarg;
1180 struct osc_object *obj = cl2osc(slice->cis_obj);
1181 struct obd_export *exp = osc_export(obj);
1182 struct ptlrpc_request *req;
1183 struct mdt_body *body;
1184 struct mdc_data_version_args *dva;
1189 memset(&oio->oi_oa, 0, sizeof(oio->oi_oa));
1190 oio->oi_oa.o_oi.oi_fid = *lu_object_fid(osc2lu(obj));
1191 oio->oi_oa.o_valid = OBD_MD_FLID;
1193 init_completion(&cbargs->opc_sync);
1195 req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_MDS_GETATTR);
1199 rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_GETATTR);
1201 ptlrpc_request_free(req);
1205 body = req_capsule_client_get(&req->rq_pill, &RMF_MDT_BODY);
1206 body->mbo_fid1 = *lu_object_fid(osc2lu(obj));
1207 body->mbo_valid = OBD_MD_FLID;
1208 /* Indicate that data version is needed */
1209 body->mbo_valid |= OBD_MD_FLDATAVERSION;
1210 body->mbo_flags = 0;
1212 if (dv->dv_flags & (LL_DV_RD_FLUSH | LL_DV_WR_FLUSH)) {
1213 body->mbo_valid |= OBD_MD_FLFLAGS;
1214 body->mbo_flags |= OBD_FL_SRVLOCK;
1215 if (dv->dv_flags & LL_DV_WR_FLUSH)
1216 body->mbo_flags |= OBD_FL_FLUSH;
1219 req_capsule_set_size(&req->rq_pill, &RMF_ACL, RCL_SERVER, 0);
1220 req_capsule_set_size(&req->rq_pill, &RMF_MDT_MD, RCL_SERVER, 0);
1221 ptlrpc_request_set_replen(req);
1223 req->rq_interpret_reply = mdc_data_version_interpret;
1224 CLASSERT(sizeof(*dva) <= sizeof(req->rq_async_args));
1225 dva = ptlrpc_req_async_args(req);
1228 ptlrpcd_add_req(req);
1233 static void mdc_io_data_version_end(const struct lu_env *env,
1234 const struct cl_io_slice *slice)
1236 struct cl_data_version_io *dv = &slice->cis_io->u.ci_data_version;
1237 struct osc_io *oio = cl2osc_io(env, slice);
1238 struct osc_async_cbargs *cbargs = &oio->oi_cbarg;
1241 wait_for_completion(&cbargs->opc_sync);
1243 if (cbargs->opc_rc != 0) {
1244 slice->cis_io->ci_result = cbargs->opc_rc;
1246 slice->cis_io->ci_result = 0;
1247 if (!(oio->oi_oa.o_valid &
1248 (OBD_MD_LAYOUT_VERSION | OBD_MD_FLDATAVERSION)))
1249 slice->cis_io->ci_result = -ENOTSUPP;
1251 if (oio->oi_oa.o_valid & OBD_MD_LAYOUT_VERSION)
1252 dv->dv_layout_version = oio->oi_oa.o_layout_version;
1253 if (oio->oi_oa.o_valid & OBD_MD_FLDATAVERSION)
1254 dv->dv_data_version = oio->oi_oa.o_data_version;
1260 static struct cl_io_operations mdc_io_ops = {
1263 .cio_iter_init = osc_io_iter_init,
1264 .cio_iter_fini = osc_io_iter_fini,
1265 .cio_start = osc_io_read_start,
1268 .cio_iter_init = osc_io_write_iter_init,
1269 .cio_iter_fini = osc_io_write_iter_fini,
1270 .cio_start = osc_io_write_start,
1271 .cio_end = osc_io_end,
1274 .cio_iter_init = osc_io_iter_init,
1275 .cio_iter_fini = osc_io_iter_fini,
1276 .cio_start = mdc_io_setattr_start,
1277 .cio_end = osc_io_setattr_end,
1279 [CIT_DATA_VERSION] = {
1280 .cio_start = mdc_io_data_version_start,
1281 .cio_end = mdc_io_data_version_end,
1284 .cio_iter_init = osc_io_iter_init,
1285 .cio_iter_fini = osc_io_iter_fini,
1286 .cio_start = osc_io_fault_start,
1287 .cio_end = osc_io_end,
1290 .cio_start = mdc_io_fsync_start,
1291 .cio_end = osc_io_fsync_end,
1294 .cio_read_ahead = mdc_io_read_ahead,
1295 .cio_submit = osc_io_submit,
1296 .cio_commit_async = osc_io_commit_async,
1299 int mdc_io_init(const struct lu_env *env, struct cl_object *obj,
1302 struct osc_io *oio = osc_env_io(env);
1304 CL_IO_SLICE_CLEAN(oio, oi_cl);
1305 cl_io_slice_add(io, &oio->oi_cl, obj, &mdc_io_ops);
1309 static void mdc_build_res_name(struct osc_object *osc,
1310 struct ldlm_res_id *resname)
1312 fid_build_reg_res_name(lu_object_fid(osc2lu(osc)), resname);
1316 * Implementation of struct cl_req_operations::cro_attr_set() for MDC
1317 * layer. MDC is responsible for struct obdo::o_id and struct obdo::o_seq
1320 static void mdc_req_attr_set(const struct lu_env *env, struct cl_object *obj,
1321 struct cl_req_attr *attr)
1323 u64 flags = attr->cra_flags;
1325 /* Copy object FID to cl_attr */
1326 attr->cra_oa->o_oi.oi_fid = *lu_object_fid(&obj->co_lu);
1328 if (flags & OBD_MD_FLGROUP)
1329 attr->cra_oa->o_valid |= OBD_MD_FLGROUP;
1331 if (flags & OBD_MD_FLID)
1332 attr->cra_oa->o_valid |= OBD_MD_FLID;
1334 if (flags & OBD_MD_FLHANDLE) {
1335 struct osc_page *opg;
1337 opg = osc_cl_page_osc(attr->cra_page, cl2osc(obj));
1338 if (!opg->ops_srvlock) {
1341 rc = mdc_get_lock_handle(env, cl2osc(obj),
1343 &attr->cra_oa->o_handle);
1345 CL_PAGE_DEBUG(D_ERROR, env, attr->cra_page,
1346 "uncovered page!\n");
1349 attr->cra_oa->o_valid |= OBD_MD_FLHANDLE;
1355 static int mdc_attr_get(const struct lu_env *env, struct cl_object *obj,
1356 struct cl_attr *attr)
1358 struct lov_oinfo *oinfo = cl2osc(obj)->oo_oinfo;
1360 if (OST_LVB_IS_ERR(oinfo->loi_lvb.lvb_blocks))
1361 return OST_LVB_GET_ERR(oinfo->loi_lvb.lvb_blocks);
1363 return osc_attr_get(env, obj, attr);
1366 static int mdc_object_ast_clear(struct ldlm_lock *lock, void *data)
1370 if ((lock->l_ast_data == NULL && !ldlm_is_kms_ignore(lock)) ||
1371 (lock->l_ast_data == data)) {
1372 lock->l_ast_data = NULL;
1373 ldlm_set_kms_ignore(lock);
1375 RETURN(LDLM_ITER_CONTINUE);
1378 int mdc_object_prune(const struct lu_env *env, struct cl_object *obj)
1380 struct osc_object *osc = cl2osc(obj);
1381 struct ldlm_res_id *resname = &osc_env_info(env)->oti_resname;
1383 /* DLM locks don't hold a reference of osc_object so we have to
1384 * clear it before the object is being destroyed. */
1385 osc_build_res_name(osc, resname);
1386 ldlm_resource_iterate(osc_export(osc)->exp_obd->obd_namespace, resname,
1387 mdc_object_ast_clear, osc);
1391 static const struct cl_object_operations mdc_ops = {
1392 .coo_page_init = osc_page_init,
1393 .coo_lock_init = mdc_lock_init,
1394 .coo_io_init = mdc_io_init,
1395 .coo_attr_get = mdc_attr_get,
1396 .coo_attr_update = osc_attr_update,
1397 .coo_glimpse = osc_object_glimpse,
1398 .coo_req_attr_set = mdc_req_attr_set,
1399 .coo_prune = mdc_object_prune,
1402 static const struct osc_object_operations mdc_object_ops = {
1403 .oto_build_res_name = mdc_build_res_name,
1404 .oto_dlmlock_at_pgoff = mdc_dlmlock_at_pgoff,
1407 static int mdc_object_init(const struct lu_env *env, struct lu_object *obj,
1408 const struct lu_object_conf *conf)
1410 struct osc_object *osc = lu2osc(obj);
1412 if (osc->oo_initialized)
1415 osc->oo_initialized = true;
1417 return osc_object_init(env, obj, conf);
1420 static void mdc_object_free(const struct lu_env *env, struct lu_object *obj)
1422 osc_object_free(env, obj);
1425 static const struct lu_object_operations mdc_lu_obj_ops = {
1426 .loo_object_init = mdc_object_init,
1427 .loo_object_delete = NULL,
1428 .loo_object_release = NULL,
1429 .loo_object_free = mdc_object_free,
1430 .loo_object_print = osc_object_print,
1431 .loo_object_invariant = NULL
1434 struct lu_object *mdc_object_alloc(const struct lu_env *env,
1435 const struct lu_object_header *unused,
1436 struct lu_device *dev)
1438 struct osc_object *osc;
1439 struct lu_object *obj;
1441 OBD_SLAB_ALLOC_PTR_GFP(osc, osc_object_kmem, GFP_NOFS);
1444 lu_object_init(obj, NULL, dev);
1445 osc->oo_cl.co_ops = &mdc_ops;
1446 obj->lo_ops = &mdc_lu_obj_ops;
1447 osc->oo_obj_ops = &mdc_object_ops;
1448 osc->oo_initialized = false;
1455 static int mdc_cl_process_config(const struct lu_env *env,
1456 struct lu_device *d, struct lustre_cfg *cfg)
1458 return mdc_process_config(d->ld_obd, 0, cfg);
1461 const struct lu_device_operations mdc_lu_ops = {
1462 .ldo_object_alloc = mdc_object_alloc,
1463 .ldo_process_config = mdc_cl_process_config,
1464 .ldo_recovery_complete = NULL,
1467 static struct lu_device *mdc_device_alloc(const struct lu_env *env,
1468 struct lu_device_type *t,
1469 struct lustre_cfg *cfg)
1471 struct lu_device *d;
1472 struct osc_device *od;
1473 struct obd_device *obd;
1478 RETURN(ERR_PTR(-ENOMEM));
1480 cl_device_init(&od->od_cl, t);
1482 d->ld_ops = &mdc_lu_ops;
1485 obd = class_name2obd(lustre_cfg_string(cfg, 0));
1487 RETURN(ERR_PTR(-ENODEV));
1489 rc = mdc_setup(obd, cfg);
1491 osc_device_free(env, d);
1492 RETURN(ERR_PTR(rc));
1494 od->od_exp = obd->obd_self_export;
1498 static const struct lu_device_type_operations mdc_device_type_ops = {
1499 .ldto_device_alloc = mdc_device_alloc,
1500 .ldto_device_free = osc_device_free,
1501 .ldto_device_init = osc_device_init,
1502 .ldto_device_fini = osc_device_fini
1505 struct lu_device_type mdc_device_type = {
1506 .ldt_tags = LU_DEVICE_CL,
1507 .ldt_name = LUSTRE_MDC_NAME,
1508 .ldt_ops = &mdc_device_type_ops,
1509 .ldt_ctx_tags = LCT_CL_THREAD