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>
37 #include <uapi/linux/lustre/lustre_param.h>
39 #include "mdc_internal.h"
41 static void mdc_lock_build_policy(const struct lu_env *env,
42 union ldlm_policy_data *policy)
44 memset(policy, 0, sizeof *policy);
45 policy->l_inodebits.bits = MDS_INODELOCK_DOM;
48 int mdc_ldlm_glimpse_ast(struct ldlm_lock *dlmlock, void *data)
50 return osc_ldlm_glimpse_ast(dlmlock, data);
53 static void mdc_lock_build_einfo(const struct lu_env *env,
54 const struct cl_lock *lock,
55 struct osc_object *osc,
56 struct ldlm_enqueue_info *einfo)
58 einfo->ei_type = LDLM_IBITS;
59 einfo->ei_mode = osc_cl_lock2ldlm(lock->cll_descr.cld_mode);
60 einfo->ei_cb_bl = mdc_ldlm_blocking_ast;
61 einfo->ei_cb_cp = ldlm_completion_ast;
62 einfo->ei_cb_gl = mdc_ldlm_glimpse_ast;
63 einfo->ei_cbdata = osc; /* value to be put into ->l_ast_data */
66 static void mdc_lock_lvb_update(const struct lu_env *env,
67 struct osc_object *osc,
68 struct ldlm_lock *dlmlock,
71 static int mdc_set_dom_lock_data(const struct lu_env *env,
72 struct ldlm_lock *lock, void *data)
74 struct osc_object *obj = data;
77 LASSERT(lock != NULL);
78 LASSERT(lock->l_glimpse_ast == mdc_ldlm_glimpse_ast);
80 lock_res_and_lock(lock);
81 if (lock->l_ast_data == NULL) {
82 lock->l_ast_data = data;
83 mdc_lock_lvb_update(env, obj, lock, NULL);
86 if (lock->l_ast_data == data)
89 unlock_res_and_lock(lock);
94 int mdc_dom_lock_match(const struct lu_env *env, struct obd_export *exp,
95 struct ldlm_res_id *res_id,
96 enum ldlm_type type, union ldlm_policy_data *policy,
97 enum ldlm_mode mode, __u64 *flags, void *data,
98 struct lustre_handle *lockh, int unref)
100 struct obd_device *obd = exp->exp_obd;
101 __u64 lflags = *flags;
106 rc = ldlm_lock_match(obd->obd_namespace, lflags,
107 res_id, type, policy, mode, lockh, unref);
108 if (rc == 0 || lflags & LDLM_FL_TEST_LOCK)
112 struct ldlm_lock *lock = ldlm_handle2lock(lockh);
114 LASSERT(lock != NULL);
115 if (!mdc_set_dom_lock_data(env, lock, data)) {
116 ldlm_lock_decref(lockh, rc);
125 * Finds an existing lock covering a page with given index.
126 * Copy of osc_obj_dlmlock_at_pgoff() but for DoM IBITS lock.
128 struct ldlm_lock *mdc_dlmlock_at_pgoff(const struct lu_env *env,
129 struct osc_object *obj, pgoff_t index,
130 enum osc_dap_flags dap_flags)
132 struct osc_thread_info *info = osc_env_info(env);
133 struct ldlm_res_id *resname = &info->oti_resname;
134 union ldlm_policy_data *policy = &info->oti_policy;
135 struct lustre_handle lockh;
136 struct ldlm_lock *lock = NULL;
142 fid_build_reg_res_name(lu_object_fid(osc2lu(obj)), resname);
143 mdc_lock_build_policy(env, policy);
145 flags = LDLM_FL_BLOCK_GRANTED | LDLM_FL_CBPENDING;
146 if (dap_flags & OSC_DAP_FL_TEST_LOCK)
147 flags |= LDLM_FL_TEST_LOCK;
150 /* Next, search for already existing extent locks that will cover us */
151 /* If we're trying to read, we also search for an existing PW lock. The
152 * VFS and page cache already protect us locally, so lots of readers/
153 * writers can share a single PW lock. */
154 mode = mdc_dom_lock_match(env, osc_export(obj), resname, LDLM_IBITS,
155 policy, LCK_PR | LCK_PW | LCK_GROUP, &flags,
157 dap_flags & OSC_DAP_FL_CANCELING);
159 lock = ldlm_handle2lock(&lockh);
160 /* RACE: the lock is cancelled so let's try again */
161 if (unlikely(lock == NULL))
169 * Check if page @page is covered by an extra lock or discard it.
171 static int mdc_check_and_discard_cb(const struct lu_env *env, struct cl_io *io,
172 struct osc_page *ops, void *cbdata)
174 struct osc_thread_info *info = osc_env_info(env);
175 struct osc_object *osc = cbdata;
178 index = osc_index(ops);
179 if (index >= info->oti_fn_index) {
180 struct ldlm_lock *tmp;
181 struct cl_page *page = ops->ops_cl.cpl_page;
183 /* refresh non-overlapped index */
184 tmp = mdc_dlmlock_at_pgoff(env, osc, index,
185 OSC_DAP_FL_TEST_LOCK);
187 info->oti_fn_index = CL_PAGE_EOF;
189 } else if (cl_page_own(env, io, page) == 0) {
190 /* discard the page */
191 cl_page_discard(env, io, page);
192 cl_page_disown(env, io, page);
194 LASSERT(page->cp_state == CPS_FREEING);
198 info->oti_next_index = index + 1;
199 return CLP_GANG_OKAY;
203 * Discard pages protected by the given lock. This function traverses radix
204 * tree to find all covering pages and discard them. If a page is being covered
205 * by other locks, it should remain in cache.
207 * If error happens on any step, the process continues anyway (the reasoning
208 * behind this being that lock cancellation cannot be delayed indefinitely).
210 static int mdc_lock_discard_pages(const struct lu_env *env,
211 struct osc_object *osc,
212 pgoff_t start, pgoff_t end,
215 struct osc_thread_info *info = osc_env_info(env);
216 struct cl_io *io = &info->oti_io;
217 osc_page_gang_cbt cb;
223 io->ci_obj = cl_object_top(osc2cl(osc));
224 io->ci_ignore_layout = 1;
225 result = cl_io_init(env, io, CIT_MISC, io->ci_obj);
229 cb = discard ? osc_discard_cb : mdc_check_and_discard_cb;
230 info->oti_fn_index = info->oti_next_index = start;
232 res = osc_page_gang_lookup(env, io, osc, info->oti_next_index,
233 end, cb, (void *)osc);
234 if (info->oti_next_index > end)
237 if (res == CLP_GANG_RESCHED)
239 } while (res != CLP_GANG_OKAY);
245 static int mdc_lock_flush(const struct lu_env *env, struct osc_object *obj,
246 pgoff_t start, pgoff_t end, enum cl_lock_mode mode,
254 if (mode == CLM_WRITE) {
255 result = osc_cache_writeback_range(env, obj, start, end, 1,
257 CDEBUG(D_CACHE, "object %p: [%lu -> %lu] %d pages were %s.\n",
258 obj, start, end, result,
259 discard ? "discarded" : "written back");
264 rc = mdc_lock_discard_pages(env, obj, start, end, discard);
265 if (result == 0 && rc < 0)
271 void mdc_lock_lockless_cancel(const struct lu_env *env,
272 const struct cl_lock_slice *slice)
274 struct osc_lock *ols = cl2osc_lock(slice);
275 struct osc_object *osc = cl2osc(slice->cls_obj);
276 struct cl_lock_descr *descr = &slice->cls_lock->cll_descr;
279 LASSERT(ols->ols_dlmlock == NULL);
280 rc = mdc_lock_flush(env, osc, descr->cld_start, descr->cld_end,
283 CERROR("Pages for lockless lock %p were not purged(%d)\n",
286 osc_lock_wake_waiters(env, osc, ols);
290 * Helper for osc_dlm_blocking_ast() handling discrepancies between cl_lock
291 * and ldlm_lock caches.
293 static int mdc_dlm_blocking_ast0(const struct lu_env *env,
294 struct ldlm_lock *dlmlock,
295 void *data, int flag)
297 struct cl_object *obj = NULL;
300 enum cl_lock_mode mode = CLM_READ;
304 LASSERT(flag == LDLM_CB_CANCELING);
305 LASSERT(dlmlock != NULL);
307 lock_res_and_lock(dlmlock);
308 if (dlmlock->l_granted_mode != dlmlock->l_req_mode) {
309 dlmlock->l_ast_data = NULL;
310 unlock_res_and_lock(dlmlock);
314 discard = ldlm_is_discard_data(dlmlock);
315 if (dlmlock->l_granted_mode & (LCK_PW | LCK_GROUP))
318 if (dlmlock->l_ast_data != NULL) {
319 obj = osc2cl(dlmlock->l_ast_data);
320 dlmlock->l_ast_data = NULL;
323 ldlm_set_kms_ignore(dlmlock);
324 unlock_res_and_lock(dlmlock);
326 /* if l_ast_data is NULL, the dlmlock was enqueued by AGL or
327 * the object has been destroyed. */
329 struct cl_attr *attr = &osc_env_info(env)->oti_attr;
331 /* Destroy pages covered by the extent of the DLM lock */
332 result = mdc_lock_flush(env, cl2osc(obj), cl_index(obj, 0),
333 CL_PAGE_EOF, mode, discard);
334 /* Losing a lock, set KMS to 0.
335 * NB: assumed that DOM lock covers whole data on MDT.
337 /* losing a lock, update kms */
338 lock_res_and_lock(dlmlock);
339 cl_object_attr_lock(obj);
341 cl_object_attr_update(env, obj, attr, CAT_KMS);
342 cl_object_attr_unlock(obj);
343 unlock_res_and_lock(dlmlock);
344 cl_object_put(env, obj);
349 int mdc_ldlm_blocking_ast(struct ldlm_lock *dlmlock,
350 struct ldlm_lock_desc *new, void *data, int flag)
357 case LDLM_CB_BLOCKING: {
358 struct lustre_handle lockh;
360 ldlm_lock2handle(dlmlock, &lockh);
361 rc = ldlm_cli_cancel(&lockh, LCF_ASYNC);
366 case LDLM_CB_CANCELING: {
371 * This can be called in the context of outer IO, e.g.,
373 * osc_enqueue_base()->...
374 * ->ldlm_prep_elc_req()->...
375 * ->ldlm_cancel_callback()->...
376 * ->osc_ldlm_blocking_ast()
378 * new environment has to be created to not corrupt outer
381 env = cl_env_get(&refcheck);
387 rc = mdc_dlm_blocking_ast0(env, dlmlock, data, flag);
388 cl_env_put(env, &refcheck);
398 * Updates object attributes from a lock value block (lvb) received together
399 * with the DLM lock reply from the server.
400 * This can be optimized to not update attributes when lock is a result of a
403 * Called under lock and resource spin-locks.
405 void mdc_lock_lvb_update(const struct lu_env *env, struct osc_object *osc,
406 struct ldlm_lock *dlmlock, struct ost_lvb *lvb)
408 struct cl_object *obj = osc2cl(osc);
409 struct lov_oinfo *oinfo = osc->oo_oinfo;
410 struct cl_attr *attr = &osc_env_info(env)->oti_attr;
411 unsigned valid = CAT_BLOCKS | CAT_ATIME | CAT_CTIME | CAT_MTIME |
417 LASSERT(dlmlock != NULL);
418 lvb = &dlmlock->l_ost_lvb;
420 cl_lvb2attr(attr, lvb);
422 cl_object_attr_lock(obj);
423 if (dlmlock != NULL) {
426 check_res_locked(dlmlock->l_resource);
427 size = lvb->lvb_size;
429 if (size >= oinfo->loi_kms) {
430 LDLM_DEBUG(dlmlock, "lock acquired, setting rss=%llu,"
431 " kms=%llu", lvb->lvb_size, size);
433 attr->cat_kms = size;
435 LDLM_DEBUG(dlmlock, "lock acquired, setting rss=%llu,"
437 lvb->lvb_size, oinfo->loi_kms);
440 cl_object_attr_update(env, obj, attr, valid);
441 cl_object_attr_unlock(obj);
445 static void mdc_lock_granted(const struct lu_env *env, struct osc_lock *oscl,
446 struct lustre_handle *lockh, bool lvb_update)
448 struct ldlm_lock *dlmlock;
452 dlmlock = ldlm_handle2lock_long(lockh, 0);
453 LASSERT(dlmlock != NULL);
455 /* lock reference taken by ldlm_handle2lock_long() is
456 * owned by osc_lock and released in osc_lock_detach()
458 lu_ref_add(&dlmlock->l_reference, "osc_lock", oscl);
459 oscl->ols_has_ref = 1;
461 LASSERT(oscl->ols_dlmlock == NULL);
462 oscl->ols_dlmlock = dlmlock;
464 /* This may be a matched lock for glimpse request, do not hold
465 * lock reference in that case. */
466 if (!oscl->ols_glimpse) {
467 /* hold a refc for non glimpse lock which will
468 * be released in osc_lock_cancel() */
469 lustre_handle_copy(&oscl->ols_handle, lockh);
470 ldlm_lock_addref(lockh, oscl->ols_einfo.ei_mode);
474 /* Lock must have been granted. */
475 lock_res_and_lock(dlmlock);
476 if (dlmlock->l_granted_mode == dlmlock->l_req_mode) {
477 struct cl_lock_descr *descr = &oscl->ols_cl.cls_lock->cll_descr;
479 /* extend the lock extent, otherwise it will have problem when
480 * we decide whether to grant a lockless lock. */
481 descr->cld_mode = osc_ldlm2cl_lock(dlmlock->l_granted_mode);
482 descr->cld_start = cl_index(descr->cld_obj, 0);
483 descr->cld_end = CL_PAGE_EOF;
485 /* no lvb update for matched lock */
487 LASSERT(oscl->ols_flags & LDLM_FL_LVB_READY);
488 mdc_lock_lvb_update(env, cl2osc(oscl->ols_cl.cls_obj),
492 unlock_res_and_lock(dlmlock);
494 LASSERT(oscl->ols_state != OLS_GRANTED);
495 oscl->ols_state = OLS_GRANTED;
500 * Lock upcall function that is executed either when a reply to ENQUEUE rpc is
501 * received from a server, or after osc_enqueue_base() matched a local DLM
504 static int mdc_lock_upcall(void *cookie, struct lustre_handle *lockh,
507 struct osc_lock *oscl = cookie;
508 struct cl_lock_slice *slice = &oscl->ols_cl;
514 env = cl_env_percpu_get();
515 /* should never happen, similar to osc_ldlm_blocking_ast(). */
516 LASSERT(!IS_ERR(env));
518 rc = ldlm_error2errno(errcode);
519 if (oscl->ols_state == OLS_ENQUEUED) {
520 oscl->ols_state = OLS_UPCALL_RECEIVED;
521 } else if (oscl->ols_state == OLS_CANCELLED) {
524 CERROR("Impossible state: %d\n", oscl->ols_state);
528 CDEBUG(D_INODE, "rc %d, err %d\n", rc, errcode);
530 mdc_lock_granted(env, oscl, lockh, errcode == ELDLM_OK);
532 /* Error handling, some errors are tolerable. */
533 if (oscl->ols_locklessable && rc == -EUSERS) {
534 /* This is a tolerable error, turn this lock into
537 osc_object_set_contended(cl2osc(slice->cls_obj));
538 LASSERT(slice->cls_ops != oscl->ols_lockless_ops);
540 /* Change this lock to ldlmlock-less lock. */
541 osc_lock_to_lockless(env, oscl, 1);
542 oscl->ols_state = OLS_GRANTED;
544 } else if (oscl->ols_glimpse && rc == -ENAVAIL) {
545 LASSERT(oscl->ols_flags & LDLM_FL_LVB_READY);
546 mdc_lock_lvb_update(env, cl2osc(slice->cls_obj),
547 NULL, &oscl->ols_lvb);
548 /* Hide the error. */
552 if (oscl->ols_owner != NULL)
553 cl_sync_io_note(env, oscl->ols_owner, rc);
554 cl_env_percpu_put(env);
559 int mdc_fill_lvb(struct ptlrpc_request *req, struct ost_lvb *lvb)
561 struct mdt_body *body;
563 body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
567 lvb->lvb_mtime = body->mbo_mtime;
568 lvb->lvb_atime = body->mbo_atime;
569 lvb->lvb_ctime = body->mbo_ctime;
570 lvb->lvb_blocks = body->mbo_dom_blocks;
571 lvb->lvb_size = body->mbo_dom_size;
576 int mdc_enqueue_fini(struct ptlrpc_request *req, osc_enqueue_upcall_f upcall,
577 void *cookie, struct lustre_handle *lockh,
578 enum ldlm_mode mode, __u64 *flags, int errcode)
580 struct osc_lock *ols = cookie;
581 struct ldlm_lock *lock;
586 /* The request was created before ldlm_cli_enqueue call. */
587 if (errcode == ELDLM_LOCK_ABORTED) {
588 struct ldlm_reply *rep;
590 rep = req_capsule_server_get(&req->rq_pill, &RMF_DLM_REP);
591 LASSERT(rep != NULL);
593 rep->lock_policy_res2 =
594 ptlrpc_status_ntoh(rep->lock_policy_res2);
595 if (rep->lock_policy_res2)
596 errcode = rep->lock_policy_res2;
598 rc = mdc_fill_lvb(req, &ols->ols_lvb);
599 *flags |= LDLM_FL_LVB_READY;
600 } else if (errcode == ELDLM_OK) {
601 /* Callers have references, should be valid always */
602 lock = ldlm_handle2lock(lockh);
605 rc = mdc_fill_lvb(req, &lock->l_ost_lvb);
607 *flags |= LDLM_FL_LVB_READY;
610 /* Call the update callback. */
611 rc = (*upcall)(cookie, lockh, rc < 0 ? rc : errcode);
613 /* release the reference taken in ldlm_cli_enqueue() */
614 if (errcode == ELDLM_LOCK_MATCHED)
616 if (errcode == ELDLM_OK && lustre_handle_is_used(lockh))
617 ldlm_lock_decref(lockh, mode);
622 int mdc_enqueue_interpret(const struct lu_env *env, struct ptlrpc_request *req,
625 struct osc_enqueue_args *aa = args;
626 struct ldlm_lock *lock;
627 struct lustre_handle *lockh = &aa->oa_lockh;
628 enum ldlm_mode mode = aa->oa_mode;
632 LASSERT(!aa->oa_speculative);
634 /* ldlm_cli_enqueue is holding a reference on the lock, so it must
636 lock = ldlm_handle2lock(lockh);
637 LASSERTF(lock != NULL,
638 "lockh %#llx, req %p, aa %p - client evicted?\n",
639 lockh->cookie, req, aa);
641 /* Take an additional reference so that a blocking AST that
642 * ldlm_cli_enqueue_fini() might post for a failed lock, is guaranteed
643 * to arrive after an upcall has been executed by
644 * osc_enqueue_fini(). */
645 ldlm_lock_addref(lockh, mode);
647 /* Let cl_lock_state_wait fail with -ERESTARTSYS to unuse sublocks. */
648 OBD_FAIL_TIMEOUT(OBD_FAIL_LDLM_ENQUEUE_HANG, 2);
650 /* Let CP AST to grant the lock first. */
651 OBD_FAIL_TIMEOUT(OBD_FAIL_OSC_CP_ENQ_RACE, 1);
653 /* Complete obtaining the lock procedure. */
654 rc = ldlm_cli_enqueue_fini(aa->oa_exp, req, aa->oa_type, 1,
655 aa->oa_mode, aa->oa_flags, NULL, 0,
657 /* Complete mdc stuff. */
658 rc = mdc_enqueue_fini(req, aa->oa_upcall, aa->oa_cookie, lockh, mode,
661 OBD_FAIL_TIMEOUT(OBD_FAIL_OSC_CP_CANCEL_RACE, 10);
663 ldlm_lock_decref(lockh, mode);
668 /* When enqueuing asynchronously, locks are not ordered, we can obtain a lock
669 * from the 2nd OSC before a lock from the 1st one. This does not deadlock with
670 * other synchronous requests, however keeping some locks and trying to obtain
671 * others may take a considerable amount of time in a case of ost failure; and
672 * when other sync requests do not get released lock from a client, the client
673 * is excluded from the cluster -- such scenarious make the life difficult, so
674 * release locks just after they are obtained. */
675 int mdc_enqueue_send(const struct lu_env *env, struct obd_export *exp,
676 struct ldlm_res_id *res_id, __u64 *flags,
677 union ldlm_policy_data *policy,
678 struct ost_lvb *lvb, int kms_valid,
679 osc_enqueue_upcall_f upcall, void *cookie,
680 struct ldlm_enqueue_info *einfo, int async)
682 struct obd_device *obd = exp->exp_obd;
683 struct lustre_handle lockh = { 0 };
684 struct ptlrpc_request *req = NULL;
685 struct ldlm_intent *lit;
687 bool glimpse = *flags & LDLM_FL_HAS_INTENT;
688 __u64 match_flags = *flags;
689 struct list_head cancels = LIST_HEAD_INIT(cancels);
694 mode = einfo->ei_mode;
695 if (einfo->ei_mode == LCK_PR)
699 match_flags |= LDLM_FL_BLOCK_GRANTED;
700 /* DOM locking uses LDLM_FL_KMS_IGNORE to mark locks wich have no valid
701 * LVB information, e.g. canceled locks or locks of just pruned object,
702 * such locks should be skipped.
704 mode = ldlm_lock_match_with_skip(obd->obd_namespace, match_flags,
705 LDLM_FL_KMS_IGNORE, res_id,
706 einfo->ei_type, policy, mode,
709 struct ldlm_lock *matched;
711 if (*flags & LDLM_FL_TEST_LOCK)
714 matched = ldlm_handle2lock(&lockh);
715 /* this shouldn't happen but this check is kept to make
716 * related test fail if problem occurs
718 if (unlikely(ldlm_is_kms_ignore(matched))) {
719 LDLM_ERROR(matched, "matched lock has KMS ignore flag");
723 if (OBD_FAIL_CHECK(OBD_FAIL_MDC_GLIMPSE_DDOS))
724 ldlm_set_kms_ignore(matched);
726 if (mdc_set_dom_lock_data(env, matched, einfo->ei_cbdata)) {
727 *flags |= LDLM_FL_LVB_READY;
729 /* We already have a lock, and it's referenced. */
730 (*upcall)(cookie, &lockh, ELDLM_LOCK_MATCHED);
732 ldlm_lock_decref(&lockh, mode);
733 LDLM_LOCK_PUT(matched);
737 ldlm_lock_decref(&lockh, mode);
738 LDLM_LOCK_PUT(matched);
741 if (*flags & (LDLM_FL_TEST_LOCK | LDLM_FL_MATCH_LOCK))
744 req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_LDLM_INTENT);
748 /* For WRITE lock cancel other locks on resource early if any */
749 if (einfo->ei_mode & LCK_PW)
750 count = mdc_resource_get_unused_res(exp, res_id, &cancels,
756 rc = ldlm_prep_enqueue_req(exp, req, &cancels, count);
758 ptlrpc_request_free(req);
762 /* pack the intent */
763 lit = req_capsule_client_get(&req->rq_pill, &RMF_LDLM_INTENT);
764 lit->opc = glimpse ? IT_GLIMPSE : IT_BRW;
766 req_capsule_set_size(&req->rq_pill, &RMF_MDT_MD, RCL_SERVER, 0);
767 req_capsule_set_size(&req->rq_pill, &RMF_ACL, RCL_SERVER, 0);
768 ptlrpc_request_set_replen(req);
770 /* users of mdc_enqueue() can pass this flag for ldlm_lock_match() */
771 *flags &= ~LDLM_FL_BLOCK_GRANTED;
772 /* All MDC IO locks are intents */
773 *flags |= LDLM_FL_HAS_INTENT;
774 rc = ldlm_cli_enqueue(exp, &req, einfo, res_id, policy, flags, NULL,
775 0, LVB_T_NONE, &lockh, async);
778 struct osc_enqueue_args *aa;
780 CLASSERT(sizeof(*aa) <= sizeof(req->rq_async_args));
781 aa = ptlrpc_req_async_args(req);
783 aa->oa_mode = einfo->ei_mode;
784 aa->oa_type = einfo->ei_type;
785 lustre_handle_copy(&aa->oa_lockh, &lockh);
786 aa->oa_upcall = upcall;
787 aa->oa_cookie = cookie;
788 aa->oa_speculative = false;
789 aa->oa_flags = flags;
792 req->rq_interpret_reply = mdc_enqueue_interpret;
793 ptlrpcd_add_req(req);
795 ptlrpc_req_finished(req);
800 rc = mdc_enqueue_fini(req, upcall, cookie, &lockh, einfo->ei_mode,
802 ptlrpc_req_finished(req);
807 * Implementation of cl_lock_operations::clo_enqueue() method for osc
808 * layer. This initiates ldlm enqueue:
810 * - cancels conflicting locks early (osc_lock_enqueue_wait());
812 * - calls osc_enqueue_base() to do actual enqueue.
814 * osc_enqueue_base() is supplied with an upcall function that is executed
815 * when lock is received either after a local cached ldlm lock is matched, or
816 * when a reply from the server is received.
818 * This function does not wait for the network communication to complete.
820 static int mdc_lock_enqueue(const struct lu_env *env,
821 const struct cl_lock_slice *slice,
822 struct cl_io *unused, struct cl_sync_io *anchor)
824 struct osc_thread_info *info = osc_env_info(env);
825 struct osc_io *oio = osc_env_io(env);
826 struct osc_object *osc = cl2osc(slice->cls_obj);
827 struct osc_lock *oscl = cl2osc_lock(slice);
828 struct cl_lock *lock = slice->cls_lock;
829 struct ldlm_res_id *resname = &info->oti_resname;
830 union ldlm_policy_data *policy = &info->oti_policy;
831 osc_enqueue_upcall_f upcall = mdc_lock_upcall;
832 void *cookie = (void *)oscl;
838 LASSERTF(ergo(oscl->ols_glimpse, lock->cll_descr.cld_mode <= CLM_READ),
839 "lock = %p, ols = %p\n", lock, oscl);
841 if (oscl->ols_state == OLS_GRANTED)
844 /* Lockahead is not supported on MDT yet */
845 if (oscl->ols_flags & LDLM_FL_NO_EXPANSION) {
846 result = -EOPNOTSUPP;
850 if (oscl->ols_flags & LDLM_FL_TEST_LOCK)
851 GOTO(enqueue_base, 0);
853 if (oscl->ols_glimpse) {
854 LASSERT(equi(oscl->ols_speculative, anchor == NULL));
856 GOTO(enqueue_base, 0);
859 result = osc_lock_enqueue_wait(env, osc, oscl);
863 /* we can grant lockless lock right after all conflicting locks
865 if (osc_lock_is_lockless(oscl)) {
866 oscl->ols_state = OLS_GRANTED;
867 oio->oi_lockless = 1;
872 oscl->ols_state = OLS_ENQUEUED;
873 if (anchor != NULL) {
874 atomic_inc(&anchor->csi_sync_nr);
875 oscl->ols_owner = anchor;
879 * DLM lock's ast data must be osc_object;
880 * DLM's enqueue callback set to osc_lock_upcall() with cookie as
883 fid_build_reg_res_name(lu_object_fid(osc2lu(osc)), resname);
884 mdc_lock_build_policy(env, policy);
885 LASSERT(!oscl->ols_speculative);
886 result = mdc_enqueue_send(env, osc_export(osc), resname,
887 &oscl->ols_flags, policy,
888 &oscl->ols_lvb, osc->oo_oinfo->loi_kms_valid,
889 upcall, cookie, &oscl->ols_einfo, async);
891 if (osc_lock_is_lockless(oscl)) {
892 oio->oi_lockless = 1;
894 LASSERT(oscl->ols_state == OLS_GRANTED);
895 LASSERT(oscl->ols_hold);
896 LASSERT(oscl->ols_dlmlock != NULL);
901 oscl->ols_state = OLS_CANCELLED;
902 osc_lock_wake_waiters(env, osc, oscl);
905 cl_sync_io_note(env, anchor, result);
910 static const struct cl_lock_operations mdc_lock_lockless_ops = {
911 .clo_fini = osc_lock_fini,
912 .clo_enqueue = mdc_lock_enqueue,
913 .clo_cancel = mdc_lock_lockless_cancel,
914 .clo_print = osc_lock_print
917 static const struct cl_lock_operations mdc_lock_ops = {
918 .clo_fini = osc_lock_fini,
919 .clo_enqueue = mdc_lock_enqueue,
920 .clo_cancel = osc_lock_cancel,
921 .clo_print = osc_lock_print,
924 int mdc_lock_init(const struct lu_env *env, struct cl_object *obj,
925 struct cl_lock *lock, const struct cl_io *io)
927 struct osc_lock *ols;
928 __u32 enqflags = lock->cll_descr.cld_enq_flags;
929 __u64 flags = osc_enq2ldlm_flags(enqflags);
933 /* Ignore AGL for Data-on-MDT, stat returns size data */
934 if ((enqflags & CEF_SPECULATIVE) != 0)
937 OBD_SLAB_ALLOC_PTR_GFP(ols, osc_lock_kmem, GFP_NOFS);
938 if (unlikely(ols == NULL))
941 ols->ols_state = OLS_NEW;
942 spin_lock_init(&ols->ols_lock);
943 INIT_LIST_HEAD(&ols->ols_waiting_list);
944 INIT_LIST_HEAD(&ols->ols_wait_entry);
945 INIT_LIST_HEAD(&ols->ols_nextlock_oscobj);
946 ols->ols_lockless_ops = &mdc_lock_lockless_ops;
948 ols->ols_flags = flags;
949 ols->ols_speculative = !!(enqflags & CEF_SPECULATIVE);
951 if (ols->ols_flags & LDLM_FL_HAS_INTENT) {
952 ols->ols_flags |= LDLM_FL_BLOCK_GRANTED;
953 ols->ols_glimpse = 1;
955 mdc_lock_build_einfo(env, lock, cl2osc(obj), &ols->ols_einfo);
957 cl_lock_slice_add(lock, &ols->ols_cl, obj, &mdc_lock_ops);
959 if (!(enqflags & CEF_MUST))
960 osc_lock_to_lockless(env, ols, (enqflags & CEF_NEVER));
961 if (ols->ols_locklessable && !(enqflags & CEF_DISCARD_DATA))
962 ols->ols_flags |= LDLM_FL_DENY_ON_CONTENTION;
964 if (io->ci_type == CIT_WRITE || cl_io_is_mkwrite(io))
965 osc_lock_set_writer(env, io, obj, ols);
967 LDLM_DEBUG_NOLOCK("lock %p, mdc lock %p, flags %llx\n",
968 lock, ols, ols->ols_flags);
975 * An implementation of cl_io_operations specific methods for MDC layer.
978 static int mdc_async_upcall(void *a, int rc)
980 struct osc_async_cbargs *args = a;
983 complete(&args->opc_sync);
987 static int mdc_get_lock_handle(const struct lu_env *env, struct osc_object *osc,
988 pgoff_t index, struct lustre_handle *lh)
990 struct ldlm_lock *lock;
992 /* find DOM lock protecting object */
993 lock = mdc_dlmlock_at_pgoff(env, osc, index,
994 OSC_DAP_FL_TEST_LOCK |
995 OSC_DAP_FL_CANCELING);
997 struct ldlm_resource *res;
998 struct ldlm_res_id *resname;
1000 resname = &osc_env_info(env)->oti_resname;
1001 fid_build_reg_res_name(lu_object_fid(osc2lu(osc)), resname);
1002 res = ldlm_resource_get(osc_export(osc)->exp_obd->obd_namespace,
1003 NULL, resname, LDLM_IBITS, 0);
1004 ldlm_resource_dump(D_ERROR, res);
1005 libcfs_debug_dumpstack(NULL);
1008 *lh = lock->l_remote_handle;
1009 LDLM_LOCK_PUT(lock);
1014 static int mdc_io_setattr_start(const struct lu_env *env,
1015 const struct cl_io_slice *slice)
1017 struct cl_io *io = slice->cis_io;
1018 struct osc_io *oio = cl2osc_io(env, slice);
1019 struct cl_object *obj = slice->cis_obj;
1020 struct lov_oinfo *loi = cl2osc(obj)->oo_oinfo;
1021 struct cl_attr *attr = &osc_env_info(env)->oti_attr;
1022 struct obdo *oa = &oio->oi_oa;
1023 struct osc_async_cbargs *cbargs = &oio->oi_cbarg;
1024 __u64 size = io->u.ci_setattr.sa_attr.lvb_size;
1025 unsigned int ia_avalid = io->u.ci_setattr.sa_avalid;
1026 enum op_xvalid ia_xvalid = io->u.ci_setattr.sa_xvalid;
1029 /* silently ignore non-truncate setattr for Data-on-MDT object */
1030 if (cl_io_is_trunc(io)) {
1031 /* truncate cache dirty pages first */
1032 rc = osc_cache_truncate_start(env, cl2osc(obj), size,
1038 if (oio->oi_lockless == 0) {
1039 cl_object_attr_lock(obj);
1040 rc = cl_object_attr_get(env, obj, attr);
1042 struct ost_lvb *lvb = &io->u.ci_setattr.sa_attr;
1043 unsigned int cl_valid = 0;
1045 if (ia_avalid & ATTR_SIZE) {
1046 attr->cat_size = size;
1047 attr->cat_kms = size;
1048 cl_valid = (CAT_SIZE | CAT_KMS);
1050 if (ia_avalid & ATTR_MTIME_SET) {
1051 attr->cat_mtime = lvb->lvb_mtime;
1052 cl_valid |= CAT_MTIME;
1054 if (ia_avalid & ATTR_ATIME_SET) {
1055 attr->cat_atime = lvb->lvb_atime;
1056 cl_valid |= CAT_ATIME;
1058 if (ia_xvalid & OP_XVALID_CTIME_SET) {
1059 attr->cat_ctime = lvb->lvb_ctime;
1060 cl_valid |= CAT_CTIME;
1062 rc = cl_object_attr_update(env, obj, attr, cl_valid);
1064 cl_object_attr_unlock(obj);
1069 if (!(ia_avalid & ATTR_SIZE))
1072 memset(oa, 0, sizeof(*oa));
1073 oa->o_oi = loi->loi_oi;
1074 oa->o_mtime = attr->cat_mtime;
1075 oa->o_atime = attr->cat_atime;
1076 oa->o_ctime = attr->cat_ctime;
1079 oa->o_blocks = OBD_OBJECT_EOF;
1080 oa->o_valid = OBD_MD_FLID | OBD_MD_FLGROUP | OBD_MD_FLATIME |
1081 OBD_MD_FLCTIME | OBD_MD_FLMTIME | OBD_MD_FLSIZE |
1083 if (oio->oi_lockless) {
1084 oa->o_flags = OBD_FL_SRVLOCK;
1085 oa->o_valid |= OBD_MD_FLFLAGS;
1087 rc = mdc_get_lock_handle(env, cl2osc(obj), CL_PAGE_EOF,
1090 oa->o_valid |= OBD_MD_FLHANDLE;
1093 init_completion(&cbargs->opc_sync);
1095 rc = osc_punch_send(osc_export(cl2osc(obj)), oa,
1096 mdc_async_upcall, cbargs);
1097 cbargs->opc_rpc_sent = rc == 0;
1101 static int mdc_io_read_ahead(const struct lu_env *env,
1102 const struct cl_io_slice *ios,
1103 pgoff_t start, struct cl_read_ahead *ra)
1105 struct osc_object *osc = cl2osc(ios->cis_obj);
1106 struct ldlm_lock *dlmlock;
1110 dlmlock = mdc_dlmlock_at_pgoff(env, osc, start, 0);
1111 if (dlmlock == NULL)
1114 if (dlmlock->l_req_mode != LCK_PR) {
1115 struct lustre_handle lockh;
1117 ldlm_lock2handle(dlmlock, &lockh);
1118 ldlm_lock_addref(&lockh, LCK_PR);
1119 ldlm_lock_decref(&lockh, dlmlock->l_req_mode);
1122 ra->cra_rpc_size = osc_cli(osc)->cl_max_pages_per_rpc;
1123 ra->cra_end = CL_PAGE_EOF;
1124 ra->cra_release = osc_read_ahead_release;
1125 ra->cra_cbdata = dlmlock;
1130 int mdc_io_fsync_start(const struct lu_env *env,
1131 const struct cl_io_slice *slice)
1133 struct cl_io *io = slice->cis_io;
1134 struct cl_fsync_io *fio = &io->u.ci_fsync;
1135 struct cl_object *obj = slice->cis_obj;
1136 struct osc_object *osc = cl2osc(obj);
1141 /* a MDC lock always covers whole object, do sync for whole
1142 * possible range despite of supplied start/end values.
1144 result = osc_cache_writeback_range(env, osc, 0, CL_PAGE_EOF, 0,
1145 fio->fi_mode == CL_FSYNC_DISCARD);
1147 fio->fi_nr_written += result;
1150 if (fio->fi_mode == CL_FSYNC_ALL) {
1153 rc = osc_cache_wait_range(env, osc, 0, CL_PAGE_EOF);
1156 /* Use OSC sync code because it is asynchronous.
1157 * It is to be added into MDC and avoid the using of
1158 * OST_SYNC at both MDC and MDT.
1160 rc = osc_fsync_ost(env, osc, fio);
1168 struct mdc_data_version_args {
1169 struct osc_io *dva_oio;
1173 mdc_data_version_interpret(const struct lu_env *env, struct ptlrpc_request *req,
1176 struct mdc_data_version_args *dva = args;
1177 struct osc_io *oio = dva->dva_oio;
1178 const struct mdt_body *body;
1184 body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
1186 GOTO(out, rc = -EPROTO);
1188 /* Prepare OBDO from mdt_body for CLIO */
1189 oio->oi_oa.o_valid = body->mbo_valid;
1190 oio->oi_oa.o_flags = body->mbo_flags;
1191 oio->oi_oa.o_data_version = body->mbo_version;
1192 oio->oi_oa.o_layout_version = body->mbo_layout_gen;
1195 oio->oi_cbarg.opc_rc = rc;
1196 complete(&oio->oi_cbarg.opc_sync);
1200 static int mdc_io_data_version_start(const struct lu_env *env,
1201 const struct cl_io_slice *slice)
1203 struct cl_data_version_io *dv = &slice->cis_io->u.ci_data_version;
1204 struct osc_io *oio = cl2osc_io(env, slice);
1205 struct osc_async_cbargs *cbargs = &oio->oi_cbarg;
1206 struct osc_object *obj = cl2osc(slice->cis_obj);
1207 struct obd_export *exp = osc_export(obj);
1208 struct ptlrpc_request *req;
1209 struct mdt_body *body;
1210 struct mdc_data_version_args *dva;
1215 memset(&oio->oi_oa, 0, sizeof(oio->oi_oa));
1216 oio->oi_oa.o_oi.oi_fid = *lu_object_fid(osc2lu(obj));
1217 oio->oi_oa.o_valid = OBD_MD_FLID;
1219 init_completion(&cbargs->opc_sync);
1221 req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_MDS_GETATTR);
1225 rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_GETATTR);
1227 ptlrpc_request_free(req);
1231 body = req_capsule_client_get(&req->rq_pill, &RMF_MDT_BODY);
1232 body->mbo_fid1 = *lu_object_fid(osc2lu(obj));
1233 body->mbo_valid = OBD_MD_FLID;
1234 /* Indicate that data version is needed */
1235 body->mbo_valid |= OBD_MD_FLDATAVERSION;
1236 body->mbo_flags = 0;
1238 if (dv->dv_flags & (LL_DV_RD_FLUSH | LL_DV_WR_FLUSH)) {
1239 body->mbo_valid |= OBD_MD_FLFLAGS;
1240 body->mbo_flags |= OBD_FL_SRVLOCK;
1241 if (dv->dv_flags & LL_DV_WR_FLUSH)
1242 body->mbo_flags |= OBD_FL_FLUSH;
1245 req_capsule_set_size(&req->rq_pill, &RMF_ACL, RCL_SERVER, 0);
1246 req_capsule_set_size(&req->rq_pill, &RMF_MDT_MD, RCL_SERVER, 0);
1247 ptlrpc_request_set_replen(req);
1249 req->rq_interpret_reply = mdc_data_version_interpret;
1250 CLASSERT(sizeof(*dva) <= sizeof(req->rq_async_args));
1251 dva = ptlrpc_req_async_args(req);
1254 ptlrpcd_add_req(req);
1259 static void mdc_io_data_version_end(const struct lu_env *env,
1260 const struct cl_io_slice *slice)
1262 struct cl_data_version_io *dv = &slice->cis_io->u.ci_data_version;
1263 struct osc_io *oio = cl2osc_io(env, slice);
1264 struct osc_async_cbargs *cbargs = &oio->oi_cbarg;
1267 wait_for_completion(&cbargs->opc_sync);
1269 if (cbargs->opc_rc != 0) {
1270 slice->cis_io->ci_result = cbargs->opc_rc;
1272 slice->cis_io->ci_result = 0;
1273 if (!(oio->oi_oa.o_valid &
1274 (OBD_MD_LAYOUT_VERSION | OBD_MD_FLDATAVERSION)))
1275 slice->cis_io->ci_result = -ENOTSUPP;
1277 if (oio->oi_oa.o_valid & OBD_MD_LAYOUT_VERSION)
1278 dv->dv_layout_version = oio->oi_oa.o_layout_version;
1279 if (oio->oi_oa.o_valid & OBD_MD_FLDATAVERSION)
1280 dv->dv_data_version = oio->oi_oa.o_data_version;
1286 static struct cl_io_operations mdc_io_ops = {
1289 .cio_iter_init = osc_io_iter_init,
1290 .cio_iter_fini = osc_io_iter_fini,
1291 .cio_start = osc_io_read_start,
1294 .cio_iter_init = osc_io_write_iter_init,
1295 .cio_iter_fini = osc_io_write_iter_fini,
1296 .cio_start = osc_io_write_start,
1297 .cio_end = osc_io_end,
1300 .cio_iter_init = osc_io_iter_init,
1301 .cio_iter_fini = osc_io_iter_fini,
1302 .cio_start = mdc_io_setattr_start,
1303 .cio_end = osc_io_setattr_end,
1305 [CIT_DATA_VERSION] = {
1306 .cio_start = mdc_io_data_version_start,
1307 .cio_end = mdc_io_data_version_end,
1310 .cio_iter_init = osc_io_iter_init,
1311 .cio_iter_fini = osc_io_iter_fini,
1312 .cio_start = osc_io_fault_start,
1313 .cio_end = osc_io_end,
1316 .cio_start = mdc_io_fsync_start,
1317 .cio_end = osc_io_fsync_end,
1320 .cio_read_ahead = mdc_io_read_ahead,
1321 .cio_submit = osc_io_submit,
1322 .cio_commit_async = osc_io_commit_async,
1325 int mdc_io_init(const struct lu_env *env, struct cl_object *obj,
1328 struct osc_io *oio = osc_env_io(env);
1330 CL_IO_SLICE_CLEAN(oio, oi_cl);
1331 cl_io_slice_add(io, &oio->oi_cl, obj, &mdc_io_ops);
1335 static void mdc_build_res_name(struct osc_object *osc,
1336 struct ldlm_res_id *resname)
1338 fid_build_reg_res_name(lu_object_fid(osc2lu(osc)), resname);
1342 * Implementation of struct cl_req_operations::cro_attr_set() for MDC
1343 * layer. MDC is responsible for struct obdo::o_id and struct obdo::o_seq
1346 static void mdc_req_attr_set(const struct lu_env *env, struct cl_object *obj,
1347 struct cl_req_attr *attr)
1349 u64 flags = attr->cra_flags;
1351 /* Copy object FID to cl_attr */
1352 attr->cra_oa->o_oi.oi_fid = *lu_object_fid(&obj->co_lu);
1354 if (flags & OBD_MD_FLGROUP)
1355 attr->cra_oa->o_valid |= OBD_MD_FLGROUP;
1357 if (flags & OBD_MD_FLID)
1358 attr->cra_oa->o_valid |= OBD_MD_FLID;
1360 if (flags & OBD_MD_FLHANDLE) {
1361 struct osc_page *opg;
1363 opg = osc_cl_page_osc(attr->cra_page, cl2osc(obj));
1364 if (!opg->ops_srvlock) {
1367 rc = mdc_get_lock_handle(env, cl2osc(obj),
1369 &attr->cra_oa->o_handle);
1371 CL_PAGE_DEBUG(D_ERROR, env, attr->cra_page,
1372 "uncovered page!\n");
1375 attr->cra_oa->o_valid |= OBD_MD_FLHANDLE;
1381 static int mdc_attr_get(const struct lu_env *env, struct cl_object *obj,
1382 struct cl_attr *attr)
1384 struct lov_oinfo *oinfo = cl2osc(obj)->oo_oinfo;
1386 if (OST_LVB_IS_ERR(oinfo->loi_lvb.lvb_blocks))
1387 return OST_LVB_GET_ERR(oinfo->loi_lvb.lvb_blocks);
1389 return osc_attr_get(env, obj, attr);
1392 static int mdc_object_ast_clear(struct ldlm_lock *lock, void *data)
1396 if (lock->l_ast_data == data)
1397 lock->l_ast_data = NULL;
1398 ldlm_set_kms_ignore(lock);
1399 RETURN(LDLM_ITER_CONTINUE);
1402 int mdc_object_prune(const struct lu_env *env, struct cl_object *obj)
1404 struct osc_object *osc = cl2osc(obj);
1405 struct ldlm_res_id *resname = &osc_env_info(env)->oti_resname;
1407 /* DLM locks don't hold a reference of osc_object so we have to
1408 * clear it before the object is being destroyed. */
1409 osc_build_res_name(osc, resname);
1410 ldlm_resource_iterate(osc_export(osc)->exp_obd->obd_namespace, resname,
1411 mdc_object_ast_clear, osc);
1415 static const struct cl_object_operations mdc_ops = {
1416 .coo_page_init = osc_page_init,
1417 .coo_lock_init = mdc_lock_init,
1418 .coo_io_init = mdc_io_init,
1419 .coo_attr_get = mdc_attr_get,
1420 .coo_attr_update = osc_attr_update,
1421 .coo_glimpse = osc_object_glimpse,
1422 .coo_req_attr_set = mdc_req_attr_set,
1423 .coo_prune = mdc_object_prune,
1426 static const struct osc_object_operations mdc_object_ops = {
1427 .oto_build_res_name = mdc_build_res_name,
1428 .oto_dlmlock_at_pgoff = mdc_dlmlock_at_pgoff,
1431 static int mdc_object_init(const struct lu_env *env, struct lu_object *obj,
1432 const struct lu_object_conf *conf)
1434 struct osc_object *osc = lu2osc(obj);
1436 if (osc->oo_initialized)
1439 osc->oo_initialized = true;
1441 return osc_object_init(env, obj, conf);
1444 static void mdc_object_free(const struct lu_env *env, struct lu_object *obj)
1446 osc_object_free(env, obj);
1449 static const struct lu_object_operations mdc_lu_obj_ops = {
1450 .loo_object_init = mdc_object_init,
1451 .loo_object_delete = NULL,
1452 .loo_object_release = NULL,
1453 .loo_object_free = mdc_object_free,
1454 .loo_object_print = osc_object_print,
1455 .loo_object_invariant = NULL
1458 struct lu_object *mdc_object_alloc(const struct lu_env *env,
1459 const struct lu_object_header *unused,
1460 struct lu_device *dev)
1462 struct osc_object *osc;
1463 struct lu_object *obj;
1465 OBD_SLAB_ALLOC_PTR_GFP(osc, osc_object_kmem, GFP_NOFS);
1468 lu_object_init(obj, NULL, dev);
1469 osc->oo_cl.co_ops = &mdc_ops;
1470 obj->lo_ops = &mdc_lu_obj_ops;
1471 osc->oo_obj_ops = &mdc_object_ops;
1472 osc->oo_initialized = false;
1479 static int mdc_process_config(const struct lu_env *env, struct lu_device *d,
1480 struct lustre_cfg *cfg)
1482 size_t count = class_modify_config(cfg, PARAM_MDC,
1483 &d->ld_obd->obd_kset.kobj);
1484 return count > 0 ? 0 : count;
1487 const struct lu_device_operations mdc_lu_ops = {
1488 .ldo_object_alloc = mdc_object_alloc,
1489 .ldo_process_config = mdc_process_config,
1490 .ldo_recovery_complete = NULL,
1493 static struct lu_device *mdc_device_alloc(const struct lu_env *env,
1494 struct lu_device_type *t,
1495 struct lustre_cfg *cfg)
1497 struct lu_device *d;
1498 struct osc_device *od;
1499 struct obd_device *obd;
1504 RETURN(ERR_PTR(-ENOMEM));
1506 cl_device_init(&od->od_cl, t);
1508 d->ld_ops = &mdc_lu_ops;
1511 obd = class_name2obd(lustre_cfg_string(cfg, 0));
1513 RETURN(ERR_PTR(-ENODEV));
1515 rc = mdc_setup(obd, cfg);
1517 osc_device_free(env, d);
1518 RETURN(ERR_PTR(rc));
1520 od->od_exp = obd->obd_self_export;
1524 static const struct lu_device_type_operations mdc_device_type_ops = {
1525 .ldto_device_alloc = mdc_device_alloc,
1526 .ldto_device_free = osc_device_free,
1527 .ldto_device_init = osc_device_init,
1528 .ldto_device_fini = osc_device_fini
1531 struct lu_device_type mdc_device_type = {
1532 .ldt_tags = LU_DEVICE_CL,
1533 .ldt_name = LUSTRE_MDC_NAME,
1534 .ldt_ops = &mdc_device_type_ops,
1535 .ldt_ctx_tags = LCT_CL_THREAD