4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21 * CA 95054 USA or visit www.sun.com if you need additional information or
27 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
30 * Copyright (c) 2011, 2013, Intel Corporation.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
36 * lustre/mdt/mdt_recovery.c
38 * Lustre Metadata Target (mdt) recovery-related methods
40 * Author: Huang Hua <huanghua@clusterfs.com>
41 * Author: Pershin Mike <tappro@clusterfs.com>
44 #define DEBUG_SUBSYSTEM S_MDS
46 #include "mdt_internal.h"
48 struct lu_buf *mdt_buf(const struct lu_env *env, void *area, ssize_t len)
51 struct mdt_thread_info *mti;
53 mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
60 const struct lu_buf *mdt_buf_const(const struct lu_env *env,
61 const void *area, ssize_t len)
64 struct mdt_thread_info *mti;
66 mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
69 buf->lb_buf = (void *)area;
74 void mdt_trans_stop(const struct lu_env *env,
75 struct mdt_device *mdt, struct thandle *th)
77 dt_trans_stop(env, mdt->mdt_bottom, th);
80 static int mdt_clients_data_init(const struct lu_env *env,
81 struct mdt_device *mdt,
82 unsigned long last_size)
84 struct lr_server_data *lsd = &mdt->mdt_lut.lut_lsd;
85 struct lsd_client_data *lcd;
86 struct obd_device *obd = mdt2obd_dev(mdt);
96 /* When we do a clean MDS shutdown, we save the last_transno into
97 * the header. If we find clients with higher last_transno values
98 * then those clients may need recovery done. */
99 LASSERT(cfs_atomic_read(&obd->obd_req_replay_clients) == 0);
100 for (cl_idx = 0, off = lsd->lsd_client_start;
101 off < last_size; cl_idx++) {
103 struct obd_export *exp;
104 struct mdt_thread_info *mti;
106 off = lsd->lsd_client_start +
107 cl_idx * lsd->lsd_client_size;
109 rc = tgt_client_data_read(env, &mdt->mdt_lut, lcd, &off, cl_idx);
111 CERROR("error reading MDS %s idx %d, off %llu: rc %d\n",
112 LAST_RCVD, cl_idx, off, rc);
114 break; /* read error shouldn't cause startup to fail */
117 if (lcd->lcd_uuid[0] == '\0') {
118 CDEBUG(D_INFO, "skipping zeroed client at offset %d\n",
123 last_transno = lcd_last_transno(lcd);
125 /* These exports are cleaned up by mdt_obd_disconnect(), so
126 * they need to be set up like real exports as
127 * mdt_obd_connect() does.
129 CDEBUG(D_HA, "RCVRNG CLIENT uuid: %s idx: %d lr: "LPU64
130 " srv lr: "LPU64" lx: "LPU64"\n", lcd->lcd_uuid, cl_idx,
131 last_transno, lsd->lsd_last_transno,
134 exp = class_new_export(obd, (struct obd_uuid *)lcd->lcd_uuid);
136 if (PTR_ERR(exp) == -EALREADY) {
137 /* export already exists, zero out this one */
138 CERROR("Duplicate export %s!\n", lcd->lcd_uuid);
141 GOTO(err_client, rc = PTR_ERR(exp));
144 mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
145 LASSERT(mti != NULL);
147 /* copy on-disk lcd to the export */
148 *exp->exp_target_data.ted_lcd = *lcd;
149 rc = tgt_client_add(env, exp, cl_idx);
150 /* can't fail existing */
151 LASSERTF(rc == 0, "rc = %d\n", rc);
152 /* VBR: set export last committed version */
153 exp->exp_last_committed = last_transno;
154 spin_lock(&exp->exp_lock);
155 exp->exp_connecting = 0;
156 exp->exp_in_recovery = 0;
157 spin_unlock(&exp->exp_lock);
158 obd->obd_max_recoverable_clients++;
159 class_export_put(exp);
161 CDEBUG(D_OTHER, "client at idx %d has last_transno ="LPU64"\n",
162 cl_idx, last_transno);
163 /* protect __u64 value update */
164 spin_lock(&mdt->mdt_lut.lut_translock);
165 mdt->mdt_lut.lut_last_transno = max(last_transno,
166 mdt->mdt_lut.lut_last_transno);
167 spin_unlock(&mdt->mdt_lut.lut_translock);
175 static int mdt_server_data_init(const struct lu_env *env,
176 struct mdt_device *mdt,
177 struct lustre_sb_info *lsi)
179 struct lr_server_data *lsd = &mdt->mdt_lut.lut_lsd;
180 struct lsd_client_data *lcd = NULL;
181 struct obd_device *obd = mdt2obd_dev(mdt);
182 struct mdt_thread_info *mti;
183 struct dt_object *obj;
185 unsigned long last_rcvd_size;
191 /* ensure padding in the struct is the correct size */
192 CLASSERT(offsetof(struct lr_server_data, lsd_padding) +
193 sizeof(lsd->lsd_padding) == LR_SERVER_SIZE);
194 CLASSERT(offsetof(struct lsd_client_data, lcd_padding) +
195 sizeof(lcd->lcd_padding) == LR_CLIENT_SIZE);
197 rc = server_name2index(mdt_obd_name(mdt), &index, NULL);
199 CERROR("%s: Can not get index from obd_name: rc = %d\n",
200 mdt_obd_name(mdt), rc);
204 mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
205 LASSERT(mti != NULL);
206 la = &mti->mti_attr.ma_attr;
208 obj = mdt->mdt_lut.lut_last_rcvd;
209 rc = dt_attr_get(env, obj, la, BYPASS_CAPA);
213 last_rcvd_size = (unsigned long)la->la_size;
215 if (last_rcvd_size == 0) {
216 LCONSOLE_WARN("%s: new disk, initializing\n",
219 memcpy(lsd->lsd_uuid, obd->obd_uuid.uuid,
220 sizeof(lsd->lsd_uuid));
221 lsd->lsd_last_transno = 0;
222 lsd->lsd_mount_count = 0;
223 lsd->lsd_server_size = LR_SERVER_SIZE;
224 lsd->lsd_client_start = LR_CLIENT_START;
225 lsd->lsd_client_size = LR_CLIENT_SIZE;
226 lsd->lsd_feature_compat = OBD_COMPAT_MDT;
227 lsd->lsd_feature_rocompat = OBD_ROCOMPAT_LOVOBJID;
228 lsd->lsd_feature_incompat = OBD_INCOMPAT_MDT |
229 OBD_INCOMPAT_COMMON_LR |
230 OBD_INCOMPAT_MULTI_OI;
231 lsd->lsd_osd_index = index;
233 LCONSOLE_WARN("%s: used disk, loading\n", mdt_obd_name(mdt));
234 rc = tgt_server_data_read(env, &mdt->mdt_lut);
236 CERROR("error reading MDS %s: rc %d\n", LAST_RCVD, rc);
239 if (strcmp(lsd->lsd_uuid, obd->obd_uuid.uuid) != 0) {
240 LCONSOLE_ERROR_MSG(0x157, "Trying to start OBD %s using"
241 "the wrong disk %s. Were the /dev/ "
242 "assignments rearranged?\n",
243 obd->obd_uuid.uuid, lsd->lsd_uuid);
244 GOTO(out, rc = -EINVAL);
246 lsd->lsd_feature_compat |= OBD_COMPAT_MDT;
247 lsd->lsd_feature_incompat |= OBD_INCOMPAT_MDT |
248 OBD_INCOMPAT_COMMON_LR;
249 if (lsd->lsd_osd_index != index) {
250 LCONSOLE_ERROR_MSG(0x157, "%s: index %d in last rcvd is"
251 "different with the index %d in"
252 "config log, It might be disk"
253 "corruption!\n", mdt_obd_name(mdt),
254 lsd->lsd_osd_index, index);
255 GOTO(out, rc = -EINVAL);
258 mount_count = lsd->lsd_mount_count;
260 if (lsd->lsd_feature_incompat & ~MDT_INCOMPAT_SUPP) {
261 CERROR("%s: unsupported incompat filesystem feature(s) %x\n",
263 lsd->lsd_feature_incompat & ~MDT_INCOMPAT_SUPP);
264 GOTO(out, rc = -EINVAL);
266 if (lsd->lsd_feature_rocompat & ~MDT_ROCOMPAT_SUPP) {
267 CERROR("%s: unsupported read-only filesystem feature(s) %x\n",
269 lsd->lsd_feature_rocompat & ~MDT_ROCOMPAT_SUPP);
270 /* XXX: Do something like remount filesystem read-only */
271 GOTO(out, rc = -EINVAL);
273 /** Interop: evict all clients at first boot with 1.8 last_rcvd */
274 if (!(lsd->lsd_feature_compat & OBD_COMPAT_20)) {
275 if (last_rcvd_size > lsd->lsd_client_start) {
276 LCONSOLE_WARN("Mounting %s at first time on 1.8 FS, "
277 "remove all clients for interop needs\n",
279 rc = tgt_truncate_last_rcvd(env, &mdt->mdt_lut,
280 lsd->lsd_client_start);
283 last_rcvd_size = lsd->lsd_client_start;
285 /** set 2.0 flag to upgrade/downgrade between 1.8 and 2.0 */
286 lsd->lsd_feature_compat |= OBD_COMPAT_20;
289 lsd->lsd_feature_incompat |= OBD_INCOMPAT_FID;
291 spin_lock(&mdt->mdt_lut.lut_translock);
292 mdt->mdt_lut.lut_last_transno = lsd->lsd_last_transno;
293 spin_unlock(&mdt->mdt_lut.lut_translock);
295 CDEBUG(D_INODE, "=======,=BEGIN DUMPING LAST_RCVD========\n");
296 CDEBUG(D_INODE, "%s: server last_transno: "LPU64"\n",
297 mdt_obd_name(mdt), mdt->mdt_lut.lut_last_transno);
298 CDEBUG(D_INODE, "%s: server mount_count: "LPU64"\n",
299 mdt_obd_name(mdt), mount_count + 1);
300 CDEBUG(D_INODE, "%s: server data size: %u\n",
301 mdt_obd_name(mdt), lsd->lsd_server_size);
302 CDEBUG(D_INODE, "%s: per-client data start: %u\n",
303 mdt_obd_name(mdt), lsd->lsd_client_start);
304 CDEBUG(D_INODE, "%s: per-client data size: %u\n",
305 mdt_obd_name(mdt), lsd->lsd_client_size);
306 CDEBUG(D_INODE, "%s: last_rcvd size: %lu\n",
307 mdt_obd_name(mdt), last_rcvd_size);
308 CDEBUG(D_INODE, "%s: last_rcvd clients: %lu\n", mdt_obd_name(mdt),
309 last_rcvd_size <= lsd->lsd_client_start ? 0 :
310 (last_rcvd_size - lsd->lsd_client_start) /
311 lsd->lsd_client_size);
312 CDEBUG(D_INODE, "========END DUMPING LAST_RCVD========\n");
314 if (!lsd->lsd_server_size || !lsd->lsd_client_start ||
315 !lsd->lsd_client_size) {
316 CERROR("Bad last_rcvd contents!\n");
317 GOTO(out, rc = -EINVAL);
320 rc = mdt_clients_data_init(env, mdt, last_rcvd_size);
322 GOTO(err_client, rc);
324 spin_lock(&mdt->mdt_lut.lut_translock);
325 /* obd_last_committed is used for compatibility
326 * with other lustre recovery code */
327 obd->obd_last_committed = mdt->mdt_lut.lut_last_transno;
328 spin_unlock(&mdt->mdt_lut.lut_translock);
330 obd->u.obt.obt_mount_count = mount_count + 1;
331 obd->u.obt.obt_instance = (__u32)obd->u.obt.obt_mount_count;
332 lsd->lsd_mount_count = obd->u.obt.obt_mount_count;
334 /* save it, so mount count and last_transno is current */
335 rc = tgt_server_data_update(env, &mdt->mdt_lut, 0);
337 GOTO(err_client, rc);
342 class_disconnect_exports(obd);
348 * last_rcvd & last_committed update callbacks
350 extern struct lu_context_key mdt_thread_key;
352 /* add credits for last_rcvd update */
353 static int mdt_txn_start_cb(const struct lu_env *env,
354 struct thandle *th, void *cookie)
356 struct lu_target *tgt = cookie;
357 struct mdt_thread_info *mti;
360 /* if there is no session, then this transaction is not result of
361 * request processing but some local operation or echo client */
362 if (env->le_ses == NULL)
365 mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
367 LASSERT(tgt->lut_last_rcvd);
368 if (mti->mti_exp == NULL)
371 rc = dt_declare_record_write(env, tgt->lut_last_rcvd,
372 sizeof(struct lsd_client_data),
373 mti->mti_exp->exp_target_data.ted_lr_off,
378 rc = dt_declare_record_write(env, tgt->lut_last_rcvd,
379 sizeof(struct lr_server_data), 0, th);
383 /* we probably should not set local transno to the remote object
384 * on another storage, What about VBR on remote object? XXX */
385 if (mti->mti_mos != NULL && !mdt_object_remote(mti->mti_mos))
386 rc = dt_declare_version_set(env, mdt_obj2dt(mti->mti_mos), th);
391 /* Update last_rcvd records with latests transaction data */
392 static int mdt_txn_stop_cb(const struct lu_env *env,
393 struct thandle *txn, void *cookie)
395 struct lu_target *tgt = cookie;
396 struct mdt_thread_info *mti;
397 struct dt_object *obj = NULL;
400 if (env->le_ses == NULL)
403 mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
406 if (mti->mti_mos != NULL &&
407 mdt_object_remote(mti->mti_mos)) {
408 obj = mdt_obj2dt(mti->mti_mos);
411 rc = tgt_last_rcvd_update(env, tgt, obj, mti->mti_opdata, txn,
416 int mdt_fs_setup(const struct lu_env *env, struct mdt_device *mdt,
417 struct obd_device *obd,
418 struct lustre_sb_info *lsi)
423 if (OBD_FAIL_CHECK(OBD_FAIL_MDS_FS_SETUP))
426 /* prepare transactions callbacks */
427 mdt->mdt_txn_cb.dtc_txn_start = mdt_txn_start_cb;
428 mdt->mdt_txn_cb.dtc_txn_stop = mdt_txn_stop_cb;
429 mdt->mdt_txn_cb.dtc_txn_commit = NULL;
430 mdt->mdt_txn_cb.dtc_cookie = &mdt->mdt_lut;
431 mdt->mdt_txn_cb.dtc_tag = LCT_MD_THREAD;
432 CFS_INIT_LIST_HEAD(&mdt->mdt_txn_cb.dtc_linkage);
434 rc = mdt_server_data_init(env, mdt, lsi);
438 dt_txn_callback_add(mdt->mdt_bottom, &mdt->mdt_txn_cb);
443 void mdt_fs_cleanup(const struct lu_env *env, struct mdt_device *mdt)
447 /* Remove transaction callback */
448 dt_txn_callback_del(mdt->mdt_bottom, &mdt->mdt_txn_cb);
450 lu_object_put(env, &mdt->mdt_ck_obj->do_lu);
451 mdt->mdt_ck_obj = NULL;
455 /* reconstruction code */
456 static void mdt_steal_ack_locks(struct ptlrpc_request *req)
458 struct ptlrpc_service_part *svcpt;
459 struct obd_export *exp = req->rq_export;
461 struct ptlrpc_reply_state *oldrep;
464 /* CAVEAT EMPTOR: spinlock order */
465 spin_lock(&exp->exp_lock);
466 cfs_list_for_each (tmp, &exp->exp_outstanding_replies) {
467 oldrep = cfs_list_entry(tmp, struct ptlrpc_reply_state,
470 if (oldrep->rs_xid != req->rq_xid)
473 if (oldrep->rs_opc != lustre_msg_get_opc(req->rq_reqmsg))
474 CERROR ("Resent req xid "LPU64" has mismatched opc: "
475 "new %d old %d\n", req->rq_xid,
476 lustre_msg_get_opc(req->rq_reqmsg),
479 svcpt = oldrep->rs_svcpt;
480 spin_lock(&svcpt->scp_rep_lock);
482 cfs_list_del_init (&oldrep->rs_exp_list);
484 CDEBUG(D_HA, "Stealing %d locks from rs %p x"LPD64".t"LPD64
486 oldrep->rs_nlocks, oldrep,
487 oldrep->rs_xid, oldrep->rs_transno, oldrep->rs_opc,
488 libcfs_nid2str(exp->exp_connection->c_peer.nid));
490 for (i = 0; i < oldrep->rs_nlocks; i++)
491 ptlrpc_save_lock(req, &oldrep->rs_locks[i],
492 oldrep->rs_modes[i], 0);
493 oldrep->rs_nlocks = 0;
495 DEBUG_REQ(D_HA, req, "stole locks for");
496 spin_lock(&oldrep->rs_lock);
497 ptlrpc_schedule_difficult_reply(oldrep);
498 spin_unlock(&oldrep->rs_lock);
500 spin_unlock(&svcpt->scp_rep_lock);
503 spin_unlock(&exp->exp_lock);
507 * VBR: restore versions
509 void mdt_vbr_reconstruct(struct ptlrpc_request *req,
510 struct lsd_client_data *lcd)
512 __u64 pre_versions[4] = {0};
513 pre_versions[0] = lcd->lcd_pre_versions[0];
514 pre_versions[1] = lcd->lcd_pre_versions[1];
515 pre_versions[2] = lcd->lcd_pre_versions[2];
516 pre_versions[3] = lcd->lcd_pre_versions[3];
517 lustre_msg_set_versions(req->rq_repmsg, pre_versions);
520 void mdt_req_from_lcd(struct ptlrpc_request *req,
521 struct lsd_client_data *lcd)
523 DEBUG_REQ(D_HA, req, "restoring transno "LPD64"/status %d",
524 lcd->lcd_last_transno, lcd->lcd_last_result);
526 if (lustre_msg_get_opc(req->rq_reqmsg) == MDS_CLOSE ||
527 lustre_msg_get_opc(req->rq_repmsg) == MDS_DONE_WRITING) {
528 req->rq_transno = lcd->lcd_last_close_transno;
529 req->rq_status = lcd->lcd_last_close_result;
531 req->rq_transno = lcd->lcd_last_transno;
532 req->rq_status = lcd->lcd_last_result;
533 mdt_vbr_reconstruct(req, lcd);
535 if (req->rq_status != 0)
537 lustre_msg_set_transno(req->rq_repmsg, req->rq_transno);
538 lustre_msg_set_status(req->rq_repmsg, req->rq_status);
539 DEBUG_REQ(D_RPCTRACE, req, "restoring transno "LPD64"/status %d",
540 req->rq_transno, req->rq_status);
542 mdt_steal_ack_locks(req);
545 void mdt_reconstruct_generic(struct mdt_thread_info *mti,
546 struct mdt_lock_handle *lhc)
548 struct ptlrpc_request *req = mdt_info_req(mti);
549 struct tg_export_data *ted = &req->rq_export->exp_target_data;
551 return mdt_req_from_lcd(req, ted->ted_lcd);
554 static void mdt_reconstruct_create(struct mdt_thread_info *mti,
555 struct mdt_lock_handle *lhc)
557 struct ptlrpc_request *req = mdt_info_req(mti);
558 struct obd_export *exp = req->rq_export;
559 struct tg_export_data *ted = &exp->exp_target_data;
560 struct mdt_device *mdt = mti->mti_mdt;
561 struct mdt_object *child;
562 struct mdt_body *body;
565 mdt_req_from_lcd(req, ted->ted_lcd);
569 /* if no error, so child was created with requested fid */
570 child = mdt_object_find(mti->mti_env, mdt, mti->mti_rr.rr_fid2);
573 LCONSOLE_WARN("Child "DFID" lookup error %d."
574 " Evicting client %s with export %s.\n",
575 PFID(mdt_object_fid(child)), rc,
576 obd_uuid2str(&exp->exp_client_uuid),
577 obd_export_nid2str(exp));
578 mdt_export_evict(exp);
583 body = req_capsule_server_get(mti->mti_pill, &RMF_MDT_BODY);
584 mti->mti_attr.ma_need = MA_INODE;
585 mti->mti_attr.ma_valid = 0;
586 rc = mdt_attr_get_complex(mti, child, &mti->mti_attr);
587 if (rc == -EREMOTE) {
588 /* object was created on remote server */
589 if (!mdt_is_dne_client(exp))
590 /* Return -EIO for old client */
594 body->valid |= OBD_MD_MDS;
596 mdt_pack_attr2body(mti, body, &mti->mti_attr.ma_attr,
597 mdt_object_fid(child));
598 mdt_object_put(mti->mti_env, child);
601 static void mdt_reconstruct_setattr(struct mdt_thread_info *mti,
602 struct mdt_lock_handle *lhc)
604 struct ptlrpc_request *req = mdt_info_req(mti);
605 struct obd_export *exp = req->rq_export;
606 struct mdt_export_data *med = &exp->exp_mdt_data;
607 struct mdt_device *mdt = mti->mti_mdt;
608 struct mdt_object *obj;
609 struct mdt_body *body;
611 mdt_req_from_lcd(req, med->med_ted.ted_lcd);
615 body = req_capsule_server_get(mti->mti_pill, &RMF_MDT_BODY);
616 obj = mdt_object_find(mti->mti_env, mdt, mti->mti_rr.rr_fid1);
618 int rc = PTR_ERR(obj);
619 LCONSOLE_WARN(""DFID" lookup error %d."
620 " Evicting client %s with export %s.\n",
621 PFID(mdt_object_fid(obj)), rc,
622 obd_uuid2str(&exp->exp_client_uuid),
623 obd_export_nid2str(exp));
624 mdt_export_evict(exp);
628 mti->mti_attr.ma_need = MA_INODE;
629 mti->mti_attr.ma_valid = 0;
630 mdt_attr_get_complex(mti, obj, &mti->mti_attr);
631 mdt_pack_attr2body(mti, body, &mti->mti_attr.ma_attr,
632 mdt_object_fid(obj));
633 if (mti->mti_ioepoch && (mti->mti_ioepoch->flags & MF_EPOCH_OPEN)) {
634 struct mdt_file_data *mfd;
635 struct mdt_body *repbody;
637 repbody = req_capsule_server_get(mti->mti_pill, &RMF_MDT_BODY);
638 repbody->ioepoch = obj->mot_ioepoch;
639 spin_lock(&med->med_open_lock);
640 cfs_list_for_each_entry(mfd, &med->med_open_head, mfd_list) {
641 if (mfd->mfd_xid == req->rq_xid)
644 LASSERT(&mfd->mfd_list != &med->med_open_head);
645 spin_unlock(&med->med_open_lock);
646 repbody->handle.cookie = mfd->mfd_handle.h_cookie;
649 mdt_object_put(mti->mti_env, obj);
652 typedef void (*mdt_reconstructor)(struct mdt_thread_info *mti,
653 struct mdt_lock_handle *lhc);
655 static mdt_reconstructor reconstructors[REINT_MAX] = {
656 [REINT_SETATTR] = mdt_reconstruct_setattr,
657 [REINT_CREATE] = mdt_reconstruct_create,
658 [REINT_LINK] = mdt_reconstruct_generic,
659 [REINT_UNLINK] = mdt_reconstruct_generic,
660 [REINT_RENAME] = mdt_reconstruct_generic,
661 [REINT_OPEN] = mdt_reconstruct_open,
662 [REINT_SETXATTR] = mdt_reconstruct_generic
665 void mdt_reconstruct(struct mdt_thread_info *mti,
666 struct mdt_lock_handle *lhc)
669 reconstructors[mti->mti_rr.rr_opcode](mti, lhc);