1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
4 * Copyright (c) 2002, 2003 Cluster File Systems, Inc.
5 * Author: Mike Shaver <shaver@clusterfs.com>
7 * This file is part of Lustre, http://www.lustre.org.
9 * Lustre is free software; you can redistribute it and/or
10 * modify it under the terms of version 2 of the GNU General Public
11 * License as published by the Free Software Foundation.
13 * Lustre is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with Lustre; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 #define DEBUG_SUBSYSTEM S_RPC
25 # include <linux/config.h>
26 # include <linux/module.h>
27 # include <linux/kmod.h>
29 # include <liblustre.h>
32 #include <linux/obd_support.h>
33 #include <linux/lustre_ha.h>
34 #include <linux/lustre_net.h>
35 #include <linux/lustre_import.h>
36 #include <linux/lustre_export.h>
37 #include <linux/obd.h>
38 #include <linux/obd_class.h>
40 #include "ptlrpc_internal.h"
42 struct ptlrpc_connect_async_args {
43 __u64 pcaa_peer_committed;
44 int pcaa_initial_connect;
47 /* A CLOSED import should remain so. */
48 #define IMPORT_SET_STATE_NOLOCK(imp, state) \
50 if (imp->imp_state != LUSTRE_IMP_CLOSED) { \
51 CDEBUG(D_HA, "%p %s: changing import state from %s to %s\n", \
52 imp, imp->imp_target_uuid.uuid, \
53 ptlrpc_import_state_name(imp->imp_state), \
54 ptlrpc_import_state_name(state)); \
55 imp->imp_state = state; \
59 #define IMPORT_SET_STATE(imp, state) \
61 unsigned long flags; \
63 spin_lock_irqsave(&imp->imp_lock, flags); \
64 IMPORT_SET_STATE_NOLOCK(imp, state); \
65 spin_unlock_irqrestore(&imp->imp_lock, flags); \
69 static int ptlrpc_connect_interpret(struct ptlrpc_request *request,
71 int ptlrpc_import_recovery_state_machine(struct obd_import *imp);
73 /* Only this function is allowed to change the import state when it is
74 * CLOSED. I would rather refcount the import and free it after
75 * disconnection like we do with exports. To do that, the client_obd
76 * will need to save the peer info somewhere other than in the import,
78 int ptlrpc_init_import(struct obd_import *imp)
82 spin_lock_irqsave(&imp->imp_lock, flags);
84 imp->imp_generation++;
85 imp->imp_state = LUSTRE_IMP_NEW;
87 spin_unlock_irqrestore(&imp->imp_lock, flags);
92 #define UUID_STR "_UUID"
93 static void deuuidify(char *uuid, const char *prefix, char **uuid_start, int *uuid_len)
95 *uuid_start = !prefix || strncmp(uuid, prefix, strlen(prefix))
96 ? uuid : uuid + strlen(prefix);
98 *uuid_len = strlen(*uuid_start);
100 if (*uuid_len < strlen(UUID_STR))
103 if (!strncmp(*uuid_start + *uuid_len - strlen(UUID_STR),
104 UUID_STR, strlen(UUID_STR)))
105 *uuid_len -= strlen(UUID_STR);
108 /* Returns true if import was FULL, false if import was already not
111 int ptlrpc_set_import_discon(struct obd_import *imp)
116 spin_lock_irqsave(&imp->imp_lock, flags);
118 if (imp->imp_state == LUSTRE_IMP_FULL) {
119 char nidbuf[PTL_NALFMT_SIZE];
123 deuuidify(imp->imp_target_uuid.uuid, NULL,
124 &target_start, &target_len);
126 LCONSOLE_ERROR("Connection to service %.*s via nid %s was "
127 "lost; in progress operations using this "
128 "service will %s.\n",
129 target_len, target_start,
130 ptlrpc_peernid2str(&imp->imp_connection->c_peer,
133 ? "wait for recovery to complete"
136 CWARN("%s: connection lost to %s@%s\n",
137 imp->imp_obd->obd_name,
138 imp->imp_target_uuid.uuid,
139 imp->imp_connection->c_remote_uuid.uuid);
140 IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_DISCON);
141 spin_unlock_irqrestore(&imp->imp_lock, flags);
142 obd_import_event(imp->imp_obd, imp, IMP_EVENT_DISCON);
145 spin_unlock_irqrestore(&imp->imp_lock, flags);
146 CDEBUG(D_HA, "%p %s: import already not connected: %s\n",
147 imp,imp->imp_client->cli_name,
148 ptlrpc_import_state_name(imp->imp_state));
155 * This acts as a barrier; all existing requests are rejected, and
156 * no new requests will be accepted until the import is valid again.
158 void ptlrpc_deactivate_import(struct obd_import *imp)
163 spin_lock_irqsave(&imp->imp_lock, flags);
164 CDEBUG(D_HA, "setting import %s INVALID\n", imp->imp_target_uuid.uuid);
165 imp->imp_invalid = 1;
166 imp->imp_generation++;
167 spin_unlock_irqrestore(&imp->imp_lock, flags);
169 ptlrpc_abort_inflight(imp);
170 obd_import_event(imp->imp_obd, imp, IMP_EVENT_INACTIVE);
174 * This function will invalidate the import, if necessary, then block
175 * for all the RPC completions, and finally notify the obd to
176 * invalidate its state (ie cancel locks, clear pending requests,
179 void ptlrpc_invalidate_import(struct obd_import *imp)
181 struct l_wait_info lwi;
184 if (!imp->imp_invalid)
185 ptlrpc_deactivate_import(imp);
187 LASSERT(imp->imp_invalid);
189 /* wait for all requests to error out and call completion callbacks */
190 lwi = LWI_TIMEOUT_INTR(MAX(obd_timeout * HZ, 1), NULL,
192 rc = l_wait_event(imp->imp_recovery_waitq,
193 (atomic_read(&imp->imp_inflight) == 0),
197 CERROR("%s: rc = %d waiting for callback (%d != 0)\n",
198 imp->imp_target_uuid.uuid, rc,
199 atomic_read(&imp->imp_inflight));
201 obd_import_event(imp->imp_obd, imp, IMP_EVENT_INVALIDATE);
204 static void ptlrpc_activate_import(struct obd_import *imp)
206 struct obd_device *obd = imp->imp_obd;
209 spin_lock_irqsave(&imp->imp_lock, flags);
210 imp->imp_invalid = 0;
211 spin_unlock_irqrestore(&imp->imp_lock, flags);
213 obd_import_event(obd, imp, IMP_EVENT_ACTIVE);
216 void ptlrpc_fail_import(struct obd_import *imp, int generation)
220 LASSERT (!imp->imp_dlm_fake);
222 if (ptlrpc_set_import_discon(imp)) {
225 if (!imp->imp_replayable) {
226 CDEBUG(D_HA, "import %s@%s for %s not replayable, "
227 "auto-deactivating\n",
228 imp->imp_target_uuid.uuid,
229 imp->imp_connection->c_remote_uuid.uuid,
230 imp->imp_obd->obd_name);
231 ptlrpc_deactivate_import(imp);
234 CDEBUG(D_HA, "%s: waking up pinger\n",
235 imp->imp_target_uuid.uuid);
237 spin_lock_irqsave(&imp->imp_lock, flags);
238 imp->imp_force_verify = 1;
239 spin_unlock_irqrestore(&imp->imp_lock, flags);
241 ptlrpc_pinger_wake_up();
246 #define ATTEMPT_TOO_SOON(last) \
247 ((last) && ((long)(jiffies - (last)) <= (long)(obd_timeout * 2 * HZ)))
249 static int import_select_connection(struct obd_import *imp)
251 struct obd_import_conn *imp_conn, *tmp;
252 struct obd_export *dlmexp;
256 spin_lock(&imp->imp_lock);
258 if (list_empty(&imp->imp_conn_list)) {
259 CERROR("%s: no connections available\n",
260 imp->imp_obd->obd_name);
261 spin_unlock(&imp->imp_lock);
265 list_for_each_entry(imp_conn, &imp->imp_conn_list, oic_item) {
266 if (!imp_conn->oic_last_attempt ||
267 time_after(jiffies, imp_conn->oic_last_attempt +
268 obd_timeout * 2 * HZ)) {
274 /* if not found, simply choose the current one */
276 CWARN("%s: continuing with current connection\n",
277 imp->imp_obd->obd_name);
278 LASSERT(imp->imp_conn_current);
279 imp_conn = imp->imp_conn_current;
281 LASSERT(imp_conn->oic_conn);
283 imp_conn->oic_last_attempt = jiffies;
285 /* move the items ahead of the selected one to list tail */
287 tmp= list_entry(imp->imp_conn_list.next,
288 struct obd_import_conn, oic_item);
291 list_del(&tmp->oic_item);
292 list_add_tail(&tmp->oic_item, &imp->imp_conn_list);
295 /* switch connection, don't mind if it's same as the current one */
296 if (imp->imp_connection)
297 ptlrpc_put_connection(imp->imp_connection);
298 imp->imp_connection = ptlrpc_connection_addref(imp_conn->oic_conn);
300 dlmexp = class_conn2export(&imp->imp_dlm_handle);
301 LASSERT(dlmexp != NULL);
302 if (dlmexp->exp_connection)
303 ptlrpc_put_connection(imp->imp_connection);
304 dlmexp->exp_connection = ptlrpc_connection_addref(imp_conn->oic_conn);
305 class_export_put(dlmexp);
307 imp->imp_conn_current = imp_conn;
308 CWARN("%s: Using connection %s\n",
309 imp->imp_obd->obd_name,
310 imp_conn->oic_uuid.uuid);
311 spin_unlock(&imp->imp_lock);
316 int ptlrpc_connect_import(struct obd_import *imp, char * new_uuid)
318 struct obd_device *obd = imp->imp_obd;
319 int initial_connect = 0;
321 __u64 committed_before_reconnect = 0;
322 struct ptlrpc_request *request;
323 int size[] = {sizeof(imp->imp_target_uuid),
324 sizeof(obd->obd_uuid),
325 sizeof(imp->imp_dlm_handle),
326 sizeof(imp->imp_connect_data)};
327 char *tmp[] = {imp->imp_target_uuid.uuid,
329 (char *)&imp->imp_dlm_handle,
330 (char *)&imp->imp_connect_data};
331 struct ptlrpc_connect_async_args *aa;
334 spin_lock_irqsave(&imp->imp_lock, flags);
335 if (imp->imp_state == LUSTRE_IMP_CLOSED) {
336 spin_unlock_irqrestore(&imp->imp_lock, flags);
337 CERROR("can't connect to a closed import\n");
339 } else if (imp->imp_state == LUSTRE_IMP_FULL) {
340 spin_unlock_irqrestore(&imp->imp_lock, flags);
341 CERROR("already connected\n");
343 } else if (imp->imp_state == LUSTRE_IMP_CONNECTING) {
344 spin_unlock_irqrestore(&imp->imp_lock, flags);
345 CERROR("already connecting\n");
349 IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_CONNECTING);
352 imp->imp_resend_replay = 0;
354 if (imp->imp_remote_handle.cookie == 0) {
357 committed_before_reconnect = imp->imp_peer_committed_transno;
360 spin_unlock_irqrestore(&imp->imp_lock, flags);
363 struct obd_uuid uuid;
365 obd_str2uuid(&uuid, new_uuid);
366 rc = import_set_conn_priority(imp, &uuid);
371 rc = import_select_connection(imp);
375 request = ptlrpc_prep_req(imp, imp->imp_connect_op, 4, size, tmp);
377 GOTO(out, rc = -ENOMEM);
380 lustre_msg_add_op_flags(request->rq_reqmsg, MSG_CONNECT_LIBCLIENT);
383 request->rq_send_state = LUSTRE_IMP_CONNECTING;
384 size[0] = sizeof(struct obd_connect_data);
385 request->rq_replen = lustre_msg_size(1, size);
386 request->rq_interpret_reply = ptlrpc_connect_interpret;
388 LASSERT (sizeof (*aa) <= sizeof (request->rq_async_args));
389 aa = (struct ptlrpc_connect_async_args *)&request->rq_async_args;
390 memset(aa, 0, sizeof *aa);
392 aa->pcaa_peer_committed = committed_before_reconnect;
393 aa->pcaa_initial_connect = initial_connect;
395 if (aa->pcaa_initial_connect)
396 imp->imp_replayable = 1;
398 ptlrpcd_add_req(request);
402 IMPORT_SET_STATE(imp, LUSTRE_IMP_DISCON);
408 static int ptlrpc_connect_interpret(struct ptlrpc_request *request,
411 struct ptlrpc_connect_async_args *aa = data;
412 struct obd_import *imp = request->rq_import;
413 struct lustre_handle old_hdl;
418 spin_lock_irqsave(&imp->imp_lock, flags);
419 if (imp->imp_state == LUSTRE_IMP_CLOSED) {
420 spin_unlock_irqrestore(&imp->imp_lock, flags);
423 spin_unlock_irqrestore(&imp->imp_lock, flags);
428 LASSERT(imp->imp_conn_current);
429 imp->imp_conn_current->oic_last_attempt = 0;
431 msg_flags = lustre_msg_get_op_flags(request->rq_repmsg);
433 if (aa->pcaa_initial_connect) {
434 if (msg_flags & MSG_CONNECT_REPLAYABLE) {
435 CDEBUG(D_HA, "connected to replayable target: %s\n",
436 imp->imp_target_uuid.uuid);
437 imp->imp_pingable = imp->imp_replayable = 1;
439 imp->imp_replayable = 0;
441 imp->imp_remote_handle = request->rq_repmsg->handle;
442 IMPORT_SET_STATE(imp, LUSTRE_IMP_FULL);
443 GOTO(finish, rc = 0);
446 /* Determine what recovery state to move the import to. */
447 if (MSG_CONNECT_RECONNECT & msg_flags) {
448 memset(&old_hdl, 0, sizeof(old_hdl));
449 if (!memcmp(&old_hdl, &request->rq_repmsg->handle,
451 CERROR("%s@%s didn't like our handle "LPX64
452 ", failed\n", imp->imp_target_uuid.uuid,
453 imp->imp_connection->c_remote_uuid.uuid,
454 imp->imp_dlm_handle.cookie);
455 GOTO(out, rc = -ENOTCONN);
458 if (memcmp(&imp->imp_remote_handle, &request->rq_repmsg->handle,
459 sizeof(imp->imp_remote_handle))) {
460 CERROR("%s@%s changed handle from "LPX64" to "LPX64
461 "; copying, but this may foreshadow disaster\n",
462 imp->imp_target_uuid.uuid,
463 imp->imp_connection->c_remote_uuid.uuid,
464 imp->imp_remote_handle.cookie,
465 request->rq_repmsg->handle.cookie);
466 imp->imp_remote_handle = request->rq_repmsg->handle;
468 CDEBUG(D_HA, "reconnected to %s@%s after partition\n",
469 imp->imp_target_uuid.uuid,
470 imp->imp_connection->c_remote_uuid.uuid);
473 if (imp->imp_invalid) {
474 IMPORT_SET_STATE(imp, LUSTRE_IMP_EVICTED);
475 } else if (MSG_CONNECT_RECOVERING & msg_flags) {
476 CDEBUG(D_HA, "%s: reconnected to %s during replay\n",
477 imp->imp_obd->obd_name,
478 imp->imp_target_uuid.uuid);
479 imp->imp_resend_replay = 1;
480 IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY);
482 IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
484 } else if ((MSG_CONNECT_RECOVERING & msg_flags) && !imp->imp_invalid) {
485 LASSERT(imp->imp_replayable);
486 imp->imp_remote_handle = request->rq_repmsg->handle;
487 imp->imp_last_replay_transno = 0;
488 IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY);
490 imp->imp_remote_handle = request->rq_repmsg->handle;
491 IMPORT_SET_STATE(imp, LUSTRE_IMP_EVICTED);
494 /* Sanity checks for a reconnected import. */
495 if (!(imp->imp_replayable) != !(msg_flags & MSG_CONNECT_REPLAYABLE)) {
496 CERROR("imp_replayable flag does not match server "
497 "after reconnect. We should LBUG right here.\n");
500 if (request->rq_repmsg->last_committed < aa->pcaa_peer_committed) {
501 CERROR("%s went back in time (transno "LPD64
502 " was previously committed, server now claims "LPD64
503 ")! is shared storage not coherent?\n",
504 imp->imp_target_uuid.uuid,
505 aa->pcaa_peer_committed,
506 request->rq_repmsg->last_committed);
510 rc = ptlrpc_import_recovery_state_machine(imp);
512 if (rc == -ENOTCONN) {
513 CDEBUG(D_HA, "evicted/aborted by %s@%s during recovery;"
514 "invalidating and reconnecting\n",
515 imp->imp_target_uuid.uuid,
516 imp->imp_connection->c_remote_uuid.uuid);
517 ptlrpc_connect_import(imp, NULL);
523 IMPORT_SET_STATE(imp, LUSTRE_IMP_DISCON);
524 if (aa->pcaa_initial_connect && !imp->imp_initial_recov) {
525 ptlrpc_deactivate_import(imp);
527 CDEBUG(D_HA, "recovery of %s on %s failed (%d)\n",
528 imp->imp_target_uuid.uuid,
529 (char *)imp->imp_connection->c_remote_uuid.uuid, rc);
532 wake_up(&imp->imp_recovery_waitq);
536 static int completed_replay_interpret(struct ptlrpc_request *req,
539 atomic_dec(&req->rq_import->imp_replay_inflight);
540 if (req->rq_status == 0) {
541 ptlrpc_import_recovery_state_machine(req->rq_import);
543 CDEBUG(D_HA, "%s: LAST_REPLAY message error: %d, "
545 req->rq_import->imp_obd->obd_name, req->rq_status);
546 ptlrpc_connect_import(req->rq_import, NULL);
552 static int signal_completed_replay(struct obd_import *imp)
554 struct ptlrpc_request *req;
557 LASSERT(atomic_read(&imp->imp_replay_inflight) == 0);
558 atomic_inc(&imp->imp_replay_inflight);
560 req = ptlrpc_prep_req(imp, OBD_PING, 0, NULL, NULL);
562 atomic_dec(&imp->imp_replay_inflight);
566 req->rq_replen = lustre_msg_size(0, NULL);
567 req->rq_send_state = LUSTRE_IMP_REPLAY_WAIT;
568 req->rq_reqmsg->flags |= MSG_LAST_REPLAY;
569 req->rq_timeout *= 3;
570 req->rq_interpret_reply = completed_replay_interpret;
572 ptlrpcd_add_req(req);
576 static int ptlrpc_invalidate_import_thread(void *data)
578 struct obd_import *imp = data;
586 SIGNAL_MASK_LOCK(current, flags);
587 sigfillset(¤t->blocked);
589 SIGNAL_MASK_UNLOCK(current, flags);
590 THREAD_NAME(current->comm, sizeof(current->comm), "ll_imp_inval");
593 CDEBUG(D_HA, "thread invalidate import %s to %s@%s\n",
594 imp->imp_obd->obd_name, imp->imp_target_uuid.uuid,
595 imp->imp_connection->c_remote_uuid.uuid);
597 ptlrpc_invalidate_import(imp);
599 IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
600 ptlrpc_import_recovery_state_machine(imp);
605 int ptlrpc_import_recovery_state_machine(struct obd_import *imp)
612 if (imp->imp_state == LUSTRE_IMP_EVICTED) {
613 deuuidify(imp->imp_target_uuid.uuid, NULL,
614 &target_start, &target_len);
615 LCONSOLE_ERROR("This client was evicted by %.*s; in progress "
616 "operations using this service will %s.\n",
617 target_len, target_start,
621 CDEBUG(D_HA, "evicted from %s@%s; invalidating\n",
622 imp->imp_target_uuid.uuid,
623 imp->imp_connection->c_remote_uuid.uuid);
625 rc = kernel_thread(ptlrpc_invalidate_import_thread, imp,
626 CLONE_VM | CLONE_FILES);
628 CERROR("error starting invalidate thread: %d\n", rc);
632 if (imp->imp_state == LUSTRE_IMP_REPLAY) {
633 CDEBUG(D_HA, "replay requested by %s\n",
634 imp->imp_target_uuid.uuid);
635 rc = ptlrpc_replay_next(imp, &inflight);
637 atomic_read(&imp->imp_replay_inflight) == 0) {
638 IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY_LOCKS);
639 rc = ldlm_replay_locks(imp);
646 if (imp->imp_state == LUSTRE_IMP_REPLAY_LOCKS) {
647 if (atomic_read(&imp->imp_replay_inflight) == 0) {
648 IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY_WAIT);
649 rc = signal_completed_replay(imp);
656 if (imp->imp_state == LUSTRE_IMP_REPLAY_WAIT) {
657 if (atomic_read(&imp->imp_replay_inflight) == 0) {
658 IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
662 if (imp->imp_state == LUSTRE_IMP_RECOVER) {
663 char nidbuf[PTL_NALFMT_SIZE];
665 CDEBUG(D_HA, "reconnected to %s@%s\n",
666 imp->imp_target_uuid.uuid,
667 imp->imp_connection->c_remote_uuid.uuid);
669 rc = ptlrpc_resend(imp);
672 IMPORT_SET_STATE(imp, LUSTRE_IMP_FULL);
673 ptlrpc_activate_import(imp);
675 deuuidify(imp->imp_target_uuid.uuid, NULL,
676 &target_start, &target_len);
677 ptlrpc_peernid2str(&imp->imp_connection->c_peer,
680 LCONSOLE_INFO("Connection restored to service %.*s using nid "
682 target_len, target_start, nidbuf);
684 CWARN("%s: connection restored to %s@%s\n",
685 imp->imp_obd->obd_name,
686 imp->imp_target_uuid.uuid,
687 imp->imp_connection->c_remote_uuid.uuid);
690 if (imp->imp_state == LUSTRE_IMP_FULL) {
691 wake_up(&imp->imp_recovery_waitq);
692 ptlrpc_wake_delayed(imp);
699 static int back_to_sleep(void *unused)
704 int ptlrpc_disconnect_import(struct obd_import *imp)
706 struct ptlrpc_request *request;
712 switch (imp->imp_connect_op) {
713 case OST_CONNECT: rq_opc = OST_DISCONNECT; break;
714 case MDS_CONNECT: rq_opc = MDS_DISCONNECT; break;
715 case MGMT_CONNECT:rq_opc = MGMT_DISCONNECT;break;
717 CERROR("don't know how to disconnect from %s (connect_op %d)\n",
718 imp->imp_target_uuid.uuid, imp->imp_connect_op);
723 if (ptlrpc_import_in_recovery(imp)) {
724 struct l_wait_info lwi;
725 lwi = LWI_TIMEOUT_INTR(MAX(obd_timeout * HZ, 1), back_to_sleep,
727 rc = l_wait_event(imp->imp_recovery_waitq,
728 !ptlrpc_import_in_recovery(imp), &lwi);
732 spin_lock_irqsave(&imp->imp_lock, flags);
733 if (imp->imp_state != LUSTRE_IMP_FULL) {
736 spin_unlock_irqrestore(&imp->imp_lock, flags);
738 request = ptlrpc_prep_req(imp, rq_opc, 0, NULL, NULL);
740 /* For non-replayable connections, don't attempt
741 reconnect if this fails */
742 if (!imp->imp_replayable) {
743 request->rq_no_resend = 1;
744 IMPORT_SET_STATE(imp, LUSTRE_IMP_CONNECTING);
745 request->rq_send_state = LUSTRE_IMP_CONNECTING;
747 request->rq_replen = lustre_msg_size(0, NULL);
748 rc = ptlrpc_queue_wait(request);
749 ptlrpc_req_finished(request);
752 spin_lock_irqsave(&imp->imp_lock, flags);
754 IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_CLOSED);
755 memset(&imp->imp_remote_handle, 0, sizeof(imp->imp_remote_handle));
756 spin_unlock_irqrestore(&imp->imp_lock, flags);