[linux-block.git] / drivers / staging / lustre / lustre / ptlrpc / recover.c

/*
 * GPL HEADER START
 *
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 only,
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License version 2 for more details (a copy is included
 * in the LICENSE file that accompanied this code).
 *
 * You should have received a copy of the GNU General Public License
 * version 2 along with this program; If not, see
 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
 *
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 *
 * GPL HEADER END
 */
/*
 * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
 * Use is subject to license terms.
 *
 * Copyright (c) 2011, 2015, Intel Corporation.
 */
/*
 * This file is part of Lustre, http://www.lustre.org/
 * Lustre is a trademark of Sun Microsystems, Inc.
 *
 * lustre/ptlrpc/recover.c
 *
 * Author: Mike Shaver <shaver@clusterfs.com>
 */

#define DEBUG_SUBSYSTEM S_RPC
#include "../../include/linux/libcfs/libcfs.h"

#include "../include/obd_support.h"
#include "../include/lustre_ha.h"
#include "../include/lustre_net.h"
#include "../include/lustre_import.h"
#include "../include/lustre_export.h"
#include "../include/obd.h"
#include "../include/obd_class.h"
#include <linux/list.h>

#include "ptlrpc_internal.h"

/**
 * Start recovery on disconnected import.
 * This is done by just attempting a connect
 */
void ptlrpc_initiate_recovery(struct obd_import *imp)
{
	CDEBUG(D_HA, "%s: starting recovery\n", obd2cli_tgt(imp->imp_obd));
	ptlrpc_connect_import(imp);
}

/**
 * Identify what request from replay list needs to be replayed next
 * (based on what we have already replayed) and send it to server.
 */
int ptlrpc_replay_next(struct obd_import *imp, int *inflight)
{
	int rc = 0;
	struct list_head *tmp, *pos;
	struct ptlrpc_request *req = NULL;
	__u64 last_transno;

	*inflight = 0;

	/* It might have committed some after we last spoke, so make sure we
	 * get rid of them now.
	 */
	spin_lock(&imp->imp_lock);
	imp->imp_last_transno_checked = 0;
	ptlrpc_free_committed(imp);
	last_transno = imp->imp_last_replay_transno;
	spin_unlock(&imp->imp_lock);

	CDEBUG(D_HA, "import %p from %s committed %llu last %llu\n",
	       imp, obd2cli_tgt(imp->imp_obd),
	       imp->imp_peer_committed_transno, last_transno);

	/* Do I need to hold a lock across this iteration?  We shouldn't be
	 * racing with any additions to the list, because we're in recovery
	 * and are therefore not processing additional requests to add.  Calls
	 * to ptlrpc_free_committed might commit requests, but nothing "newer"
	 * than the one we're replaying (it can't be committed until it's
	 * replayed, and we're doing that here).  l_f_e_safe protects against
	 * problems with the current request being committed, in the unlikely
	 * event of that race.  So, in conclusion, I think that it's safe to
	 * perform this list-walk without the imp_lock held.
	 *
	 * But, the {mdc,osc}_replay_open callbacks both iterate
	 * request lists, and have comments saying they assume the
	 * imp_lock is being held by ptlrpc_replay, but it's not. it's
	 * just a little race...
	 */

	/* Replay all the committed open requests on committed_list first */
	if (!list_empty(&imp->imp_committed_list)) {
		tmp = imp->imp_committed_list.prev;
		req = list_entry(tmp, struct ptlrpc_request,
				     rq_replay_list);

		/* The last request on committed_list hasn't been replayed */
		if (req->rq_transno > last_transno) {
			/* Since the imp_committed_list is immutable before
			 * all of it's requests being replayed, it's safe to
			 * use a cursor to accelerate the search */
			imp->imp_replay_cursor = imp->imp_replay_cursor->next;

			while (imp->imp_replay_cursor !=
			       &imp->imp_committed_list) {
				req = list_entry(imp->imp_replay_cursor,
						 struct ptlrpc_request,
						 rq_replay_list);
				if (req->rq_transno > last_transno)
					break;

				req = NULL;
				imp->imp_replay_cursor =
					imp->imp_replay_cursor->next;
			}
		} else {
			/* All requests on committed_list have been replayed */
			imp->imp_replay_cursor = &imp->imp_committed_list;
			req = NULL;
		}
	}

	/* All the requests in committed list have been replayed, let's replay
	 * the imp_replay_list */
	if (!req) {
		list_for_each_safe(tmp, pos, &imp->imp_replay_list) {
			req = list_entry(tmp, struct ptlrpc_request,
					 rq_replay_list);

			if (req->rq_transno > last_transno)
				break;
			req = NULL;
		}
	}

	/* If need to resend the last sent transno (because a reconnect
	 * has occurred), then stop on the matching req and send it again.
	 * If, however, the last sent transno has been committed then we
	 * continue replay from the next request. */
	if (req && imp->imp_resend_replay)
		lustre_msg_add_flags(req->rq_reqmsg, MSG_RESENT);

	spin_lock(&imp->imp_lock);
	imp->imp_resend_replay = 0;
	spin_unlock(&imp->imp_lock);

	if (req) {
		rc = ptlrpc_replay_req(req);
		if (rc) {
			CERROR("recovery replay error %d for req %llu\n",
			       rc, req->rq_xid);
			return rc;
		}
		*inflight = 1;
	}
	return rc;
}

/**
 * Schedule resending of request on sending_list. This is done after
 * we completed replaying of requests and locks.
 */
int ptlrpc_resend(struct obd_import *imp)
{
	struct ptlrpc_request *req, *next;

	/* As long as we're in recovery, nothing should be added to the sending
	 * list, so we don't need to hold the lock during this iteration and
	 * resend process.
	 */
	/* Well... what if lctl recover is called twice at the same time?
	 */
	spin_lock(&imp->imp_lock);
	if (imp->imp_state != LUSTRE_IMP_RECOVER) {
		spin_unlock(&imp->imp_lock);
		return -1;
	}

	list_for_each_entry_safe(req, next, &imp->imp_sending_list,
				     rq_list) {
		LASSERTF((long)req > PAGE_CACHE_SIZE && req != LP_POISON,
			 "req %p bad\n", req);
		LASSERTF(req->rq_type != LI_POISON, "req %p freed\n", req);
		if (!ptlrpc_no_resend(req))
			ptlrpc_resend_req(req);
	}
	spin_unlock(&imp->imp_lock);

	return 0;
}
EXPORT_SYMBOL(ptlrpc_resend);

/**
 * Go through all requests in delayed list and wake their threads
 * for resending
 */
void ptlrpc_wake_delayed(struct obd_import *imp)
{
	struct list_head *tmp, *pos;
	struct ptlrpc_request *req;

	spin_lock(&imp->imp_lock);
	list_for_each_safe(tmp, pos, &imp->imp_delayed_list) {
		req = list_entry(tmp, struct ptlrpc_request, rq_list);

		DEBUG_REQ(D_HA, req, "waking (set %p):", req->rq_set);
		ptlrpc_client_wake_req(req);
	}
	spin_unlock(&imp->imp_lock);
}
EXPORT_SYMBOL(ptlrpc_wake_delayed);

void ptlrpc_request_handle_notconn(struct ptlrpc_request *failed_req)
{
	struct obd_import *imp = failed_req->rq_import;

	CDEBUG(D_HA, "import %s of %s@%s abruptly disconnected: reconnecting\n",
	       imp->imp_obd->obd_name, obd2cli_tgt(imp->imp_obd),
	       imp->imp_connection->c_remote_uuid.uuid);

	if (ptlrpc_set_import_discon(imp,
			      lustre_msg_get_conn_cnt(failed_req->rq_reqmsg))) {
		if (!imp->imp_replayable) {
			CDEBUG(D_HA, "import %s@%s for %s not replayable, auto-deactivating\n",
			       obd2cli_tgt(imp->imp_obd),
			       imp->imp_connection->c_remote_uuid.uuid,
			       imp->imp_obd->obd_name);
			ptlrpc_deactivate_import(imp);
		}
		/* to control recovery via lctl {disable|enable}_recovery */
		if (imp->imp_deactive == 0)
			ptlrpc_connect_import(imp);
	}

	/* Wait for recovery to complete and resend. If evicted, then
	   this request will be errored out later.*/
	spin_lock(&failed_req->rq_lock);
	if (!failed_req->rq_no_resend)
		failed_req->rq_resend = 1;
	spin_unlock(&failed_req->rq_lock);
}

/**
 * Administratively active/deactive a client.
 * This should only be called by the ioctl interface, currently
 *  - the lctl deactivate and activate commands
 *  - echo 0/1 >> /sys/fs/lustre/osc/XXX/active
 *  - client umount -f (ll_umount_begin)
 */
int ptlrpc_set_import_active(struct obd_import *imp, int active)
{
	struct obd_device *obd = imp->imp_obd;
	int rc = 0;

	LASSERT(obd);

	/* When deactivating, mark import invalid, and abort in-flight
	 * requests. */
	if (!active) {
		LCONSOLE_WARN("setting import %s INACTIVE by administrator request\n",
			      obd2cli_tgt(imp->imp_obd));

		/* set before invalidate to avoid messages about imp_inval
		 * set without imp_deactive in ptlrpc_import_delay_req */
		spin_lock(&imp->imp_lock);
		imp->imp_deactive = 1;
		spin_unlock(&imp->imp_lock);

		obd_import_event(imp->imp_obd, imp, IMP_EVENT_DEACTIVATE);

		ptlrpc_invalidate_import(imp);
	}

	/* When activating, mark import valid, and attempt recovery */
	if (active) {
		CDEBUG(D_HA, "setting import %s VALID\n",
		       obd2cli_tgt(imp->imp_obd));

		spin_lock(&imp->imp_lock);
		imp->imp_deactive = 0;
		spin_unlock(&imp->imp_lock);
		obd_import_event(imp->imp_obd, imp, IMP_EVENT_ACTIVATE);

		rc = ptlrpc_recover_import(imp, NULL, 0);
	}

	return rc;
}
EXPORT_SYMBOL(ptlrpc_set_import_active);

/* Attempt to reconnect an import */
int ptlrpc_recover_import(struct obd_import *imp, char *new_uuid, int async)
{
	int rc = 0;

	spin_lock(&imp->imp_lock);
	if (imp->imp_state == LUSTRE_IMP_NEW || imp->imp_deactive ||
	    atomic_read(&imp->imp_inval_count))
		rc = -EINVAL;
	spin_unlock(&imp->imp_lock);
	if (rc)
		goto out;

	/* force import to be disconnected. */
	ptlrpc_set_import_discon(imp, 0);

	if (new_uuid) {
		struct obd_uuid uuid;

		/* intruct import to use new uuid */
		obd_str2uuid(&uuid, new_uuid);
		rc = import_set_conn_priority(imp, &uuid);
		if (rc)
			goto out;
	}

	/* Check if reconnect is already in progress */
	spin_lock(&imp->imp_lock);
	if (imp->imp_state != LUSTRE_IMP_DISCON) {
		imp->imp_force_verify = 1;
		rc = -EALREADY;
	}
	spin_unlock(&imp->imp_lock);
	if (rc)
		goto out;

	rc = ptlrpc_connect_import(imp);
	if (rc)
		goto out;

	if (!async) {
		struct l_wait_info lwi;
		int secs = cfs_time_seconds(obd_timeout);

		CDEBUG(D_HA, "%s: recovery started, waiting %u seconds\n",
		       obd2cli_tgt(imp->imp_obd), secs);

		lwi = LWI_TIMEOUT(secs, NULL, NULL);
		rc = l_wait_event(imp->imp_recovery_waitq,
				  !ptlrpc_import_in_recovery(imp), &lwi);
		CDEBUG(D_HA, "%s: recovery finished\n",
		       obd2cli_tgt(imp->imp_obd));
	}

out:
	return rc;
}
EXPORT_SYMBOL(ptlrpc_recover_import);

int ptlrpc_import_in_recovery(struct obd_import *imp)
{
	int in_recovery = 1;

	spin_lock(&imp->imp_lock);
	if (imp->imp_state == LUSTRE_IMP_FULL ||
	    imp->imp_state == LUSTRE_IMP_CLOSED ||
	    imp->imp_state == LUSTRE_IMP_DISCON ||
	    imp->imp_obd->obd_no_recov)
		in_recovery = 0;
	spin_unlock(&imp->imp_lock);

	return in_recovery;
}
Commit	Line	Data
d7e09d03 PT	1	/*
	2	* GPL HEADER START
	3	*
	4	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	5	*
	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.
	9	*
	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).
	15	*
	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
	19	*
	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
	22	* have any questions.
	23	*
	24	* GPL HEADER END
	25	*/
	26	/*
	27	* Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
	28	* Use is subject to license terms.
	29	*
1dc563a6	30	* Copyright (c) 2011, 2015, Intel Corporation.
d7e09d03 PT	31	*/
	32	/*
	33	* This file is part of Lustre, http://www.lustre.org/
	34	* Lustre is a trademark of Sun Microsystems, Inc.
	35	*
	36	* lustre/ptlrpc/recover.c
	37	*
	38	* Author: Mike Shaver <shaver@clusterfs.com>
	39	*/
	40
	41	#define DEBUG_SUBSYSTEM S_RPC
9fdaf8c0	42	#include "../../include/linux/libcfs/libcfs.h"
d7e09d03	43
e27db149 GKH	44	#include "../include/obd_support.h"
	45	#include "../include/lustre_ha.h"
	46	#include "../include/lustre_net.h"
	47	#include "../include/lustre_import.h"
	48	#include "../include/lustre_export.h"
	49	#include "../include/obd.h"
e27db149	50	#include "../include/obd_class.h"
d7e09d03 PT	51	#include <linux/list.h>
	52
	53	#include "ptlrpc_internal.h"
	54
	55	/**
	56	* Start recovery on disconnected import.
	57	* This is done by just attempting a connect
	58	*/
	59	void ptlrpc_initiate_recovery(struct obd_import *imp)
	60	{
d7e09d03 PT	61	CDEBUG(D_HA, "%s: starting recovery\n", obd2cli_tgt(imp->imp_obd));
d7e09d03 PT	62	ptlrpc_connect_import(imp);
d7e09d03 PT	63	}
	64
	65	/**
	66	* Identify what request from replay list needs to be replayed next
	67	* (based on what we have already replayed) and send it to server.
	68	*/
	69	int ptlrpc_replay_next(struct obd_import imp, int inflight)
	70	{
	71	int rc = 0;
	72	struct list_head tmp, pos;
	73	struct ptlrpc_request *req = NULL;
	74	__u64 last_transno;
d7e09d03 PT	75
	76	*inflight = 0;
	77
	78	/* It might have committed some after we last spoke, so make sure we
	79	* get rid of them now.
	80	*/
	81	spin_lock(&imp->imp_lock);
	82	imp->imp_last_transno_checked = 0;
	83	ptlrpc_free_committed(imp);
	84	last_transno = imp->imp_last_replay_transno;
	85	spin_unlock(&imp->imp_lock);
	86
b0f5aad5	87	CDEBUG(D_HA, "import %p from %s committed %llu last %llu\n",
d7e09d03 PT	88	imp, obd2cli_tgt(imp->imp_obd),
	89	imp->imp_peer_committed_transno, last_transno);
	90
	91	/* Do I need to hold a lock across this iteration? We shouldn't be
	92	* racing with any additions to the list, because we're in recovery
	93	* and are therefore not processing additional requests to add. Calls
	94	* to ptlrpc_free_committed might commit requests, but nothing "newer"
	95	* than the one we're replaying (it can't be committed until it's
	96	* replayed, and we're doing that here). l_f_e_safe protects against
	97	* problems with the current request being committed, in the unlikely
	98	* event of that race. So, in conclusion, I think that it's safe to
	99	* perform this list-walk without the imp_lock held.
	100	*
	101	* But, the {mdc,osc}_replay_open callbacks both iterate
	102	* request lists, and have comments saying they assume the
	103	* imp_lock is being held by ptlrpc_replay, but it's not. it's
	104	* just a little race...
	105	*/
63d42578 HZ	106
	107	/* Replay all the committed open requests on committed_list first */
	108	if (!list_empty(&imp->imp_committed_list)) {
	109	tmp = imp->imp_committed_list.prev;
d7e09d03 PT	110	req = list_entry(tmp, struct ptlrpc_request,
	111	rq_replay_list);
	112
63d42578	113	/* The last request on committed_list hasn't been replayed */
d7e09d03	114	if (req->rq_transno > last_transno) {
63d42578 HZ	115	/* Since the imp_committed_list is immutable before
	116	* all of it's requests being replayed, it's safe to
	117	* use a cursor to accelerate the search */
	118	imp->imp_replay_cursor = imp->imp_replay_cursor->next;
	119
	120	while (imp->imp_replay_cursor !=
	121	&imp->imp_committed_list) {
	122	req = list_entry(imp->imp_replay_cursor,
	123	struct ptlrpc_request,
	124	rq_replay_list);
	125	if (req->rq_transno > last_transno)
	126	break;
	127
	128	req = NULL;
	129	imp->imp_replay_cursor =
	130	imp->imp_replay_cursor->next;
	131	}
	132	} else {
	133	/* All requests on committed_list have been replayed */
	134	imp->imp_replay_cursor = &imp->imp_committed_list;
	135	req = NULL;
	136	}
	137	}
	138
	139	/* All the requests in committed list have been replayed, let's replay
	140	* the imp_replay_list */
8b382089	141	if (!req) {
63d42578 HZ	142	list_for_each_safe(tmp, pos, &imp->imp_replay_list) {
	143	req = list_entry(tmp, struct ptlrpc_request,
	144	rq_replay_list);
	145
	146	if (req->rq_transno > last_transno)
	147	break;
	148	req = NULL;
d7e09d03	149	}
d7e09d03 PT	150	}
d7e09d03 PT	151
63d42578 HZ	152	/* If need to resend the last sent transno (because a reconnect
	153	* has occurred), then stop on the matching req and send it again.
	154	* If, however, the last sent transno has been committed then we
	155	* continue replay from the next request. */
8b382089	156	if (req && imp->imp_resend_replay)
63d42578 HZ	157	lustre_msg_add_flags(req->rq_reqmsg, MSG_RESENT);
63d42578 HZ	158
d7e09d03 PT	159	spin_lock(&imp->imp_lock);
	160	imp->imp_resend_replay = 0;
	161	spin_unlock(&imp->imp_lock);
	162
8b382089	163	if (req) {
d7e09d03 PT	164	rc = ptlrpc_replay_req(req);
d7e09d03 PT	165	if (rc) {
b0f5aad5 GKH	166	CERROR("recovery replay error %d for req %llu\n",
b0f5aad5 GKH	167	rc, req->rq_xid);
0a3bdb00	168	return rc;
d7e09d03 PT	169	}
	170	*inflight = 1;
	171	}
0a3bdb00	172	return rc;
d7e09d03 PT	173	}
	174
	175	/**
	176	* Schedule resending of request on sending_list. This is done after
	177	* we completed replaying of requests and locks.
	178	*/
	179	int ptlrpc_resend(struct obd_import *imp)
	180	{
	181	struct ptlrpc_request req, next;
	182
d7e09d03 PT	183	/* As long as we're in recovery, nothing should be added to the sending
	184	* list, so we don't need to hold the lock during this iteration and
	185	* resend process.
	186	*/
	187	/* Well... what if lctl recover is called twice at the same time?
	188	*/
	189	spin_lock(&imp->imp_lock);
	190	if (imp->imp_state != LUSTRE_IMP_RECOVER) {
	191	spin_unlock(&imp->imp_lock);
0a3bdb00	192	return -1;
d7e09d03 PT	193	}
	194
	195	list_for_each_entry_safe(req, next, &imp->imp_sending_list,
	196	rq_list) {
	197	LASSERTF((long)req > PAGE_CACHE_SIZE && req != LP_POISON,
	198	"req %p bad\n", req);
	199	LASSERTF(req->rq_type != LI_POISON, "req %p freed\n", req);
	200	if (!ptlrpc_no_resend(req))
	201	ptlrpc_resend_req(req);
	202	}
	203	spin_unlock(&imp->imp_lock);
	204
0a3bdb00	205	return 0;
d7e09d03 PT	206	}
	207	EXPORT_SYMBOL(ptlrpc_resend);
	208
	209	/**
	210	* Go through all requests in delayed list and wake their threads
	211	* for resending
	212	*/
	213	void ptlrpc_wake_delayed(struct obd_import *imp)
	214	{
	215	struct list_head tmp, pos;
	216	struct ptlrpc_request *req;
	217
	218	spin_lock(&imp->imp_lock);
	219	list_for_each_safe(tmp, pos, &imp->imp_delayed_list) {
	220	req = list_entry(tmp, struct ptlrpc_request, rq_list);
	221
	222	DEBUG_REQ(D_HA, req, "waking (set %p):", req->rq_set);
	223	ptlrpc_client_wake_req(req);
	224	}
	225	spin_unlock(&imp->imp_lock);
	226	}
	227	EXPORT_SYMBOL(ptlrpc_wake_delayed);
	228
	229	void ptlrpc_request_handle_notconn(struct ptlrpc_request *failed_req)
	230	{
	231	struct obd_import *imp = failed_req->rq_import;
d7e09d03 PT	232
	233	CDEBUG(D_HA, "import %s of %s@%s abruptly disconnected: reconnecting\n",
	234	imp->imp_obd->obd_name, obd2cli_tgt(imp->imp_obd),
	235	imp->imp_connection->c_remote_uuid.uuid);
	236
	237	if (ptlrpc_set_import_discon(imp,
	238	lustre_msg_get_conn_cnt(failed_req->rq_reqmsg))) {
	239	if (!imp->imp_replayable) {
2d00bd17	240	CDEBUG(D_HA, "import %s@%s for %s not replayable, auto-deactivating\n",
d7e09d03 PT	241	obd2cli_tgt(imp->imp_obd),
	242	imp->imp_connection->c_remote_uuid.uuid,
	243	imp->imp_obd->obd_name);
	244	ptlrpc_deactivate_import(imp);
	245	}
	246	/* to control recovery via lctl {disable\|enable}_recovery */
	247	if (imp->imp_deactive == 0)
	248	ptlrpc_connect_import(imp);
	249	}
	250
	251	/* Wait for recovery to complete and resend. If evicted, then
	252	this request will be errored out later.*/
	253	spin_lock(&failed_req->rq_lock);
	254	if (!failed_req->rq_no_resend)
	255	failed_req->rq_resend = 1;
	256	spin_unlock(&failed_req->rq_lock);
d7e09d03 PT	257	}
	258
	259	/**
	260	* Administratively active/deactive a client.
	261	* This should only be called by the ioctl interface, currently
	262	* - the lctl deactivate and activate commands
f6e42a40	263	* - echo 0/1 >> /sys/fs/lustre/osc/XXX/active
d7e09d03 PT	264	* - client umount -f (ll_umount_begin)
	265	*/
	266	int ptlrpc_set_import_active(struct obd_import *imp, int active)
	267	{
	268	struct obd_device *obd = imp->imp_obd;
	269	int rc = 0;
	270
d7e09d03 PT	271	LASSERT(obd);
	272
	273	/* When deactivating, mark import invalid, and abort in-flight
	274	* requests. */
	275	if (!active) {
2d00bd17 JP	276	LCONSOLE_WARN("setting import %s INACTIVE by administrator request\n",
2d00bd17 JP	277	obd2cli_tgt(imp->imp_obd));
d7e09d03 PT	278
	279	/* set before invalidate to avoid messages about imp_inval
	280	* set without imp_deactive in ptlrpc_import_delay_req */
	281	spin_lock(&imp->imp_lock);
	282	imp->imp_deactive = 1;
	283	spin_unlock(&imp->imp_lock);
	284
	285	obd_import_event(imp->imp_obd, imp, IMP_EVENT_DEACTIVATE);
	286
	287	ptlrpc_invalidate_import(imp);
	288	}
	289
	290	/* When activating, mark import valid, and attempt recovery */
	291	if (active) {
	292	CDEBUG(D_HA, "setting import %s VALID\n",
	293	obd2cli_tgt(imp->imp_obd));
	294
	295	spin_lock(&imp->imp_lock);
	296	imp->imp_deactive = 0;
	297	spin_unlock(&imp->imp_lock);
	298	obd_import_event(imp->imp_obd, imp, IMP_EVENT_ACTIVATE);
	299
	300	rc = ptlrpc_recover_import(imp, NULL, 0);
	301	}
	302
0a3bdb00	303	return rc;
d7e09d03 PT	304	}
	305	EXPORT_SYMBOL(ptlrpc_set_import_active);
	306
	307	/* Attempt to reconnect an import */
	308	int ptlrpc_recover_import(struct obd_import imp, char new_uuid, int async)
	309	{
	310	int rc = 0;
d7e09d03 PT	311
	312	spin_lock(&imp->imp_lock);
	313	if (imp->imp_state == LUSTRE_IMP_NEW \|\| imp->imp_deactive \|\|
	314	atomic_read(&imp->imp_inval_count))
	315	rc = -EINVAL;
	316	spin_unlock(&imp->imp_lock);
	317	if (rc)
a9b3e8f3	318	goto out;
d7e09d03 PT	319
	320	/* force import to be disconnected. */
	321	ptlrpc_set_import_discon(imp, 0);
	322
	323	if (new_uuid) {
	324	struct obd_uuid uuid;
	325
	326	/* intruct import to use new uuid */
	327	obd_str2uuid(&uuid, new_uuid);
	328	rc = import_set_conn_priority(imp, &uuid);
	329	if (rc)
a9b3e8f3	330	goto out;
d7e09d03 PT	331	}
	332
	333	/* Check if reconnect is already in progress */
	334	spin_lock(&imp->imp_lock);
	335	if (imp->imp_state != LUSTRE_IMP_DISCON) {
	336	imp->imp_force_verify = 1;
	337	rc = -EALREADY;
	338	}
	339	spin_unlock(&imp->imp_lock);
	340	if (rc)
a9b3e8f3	341	goto out;
d7e09d03 PT	342
	343	rc = ptlrpc_connect_import(imp);
	344	if (rc)
a9b3e8f3	345	goto out;
d7e09d03 PT	346
	347	if (!async) {
	348	struct l_wait_info lwi;
	349	int secs = cfs_time_seconds(obd_timeout);
	350
	351	CDEBUG(D_HA, "%s: recovery started, waiting %u seconds\n",
	352	obd2cli_tgt(imp->imp_obd), secs);
	353
	354	lwi = LWI_TIMEOUT(secs, NULL, NULL);
	355	rc = l_wait_event(imp->imp_recovery_waitq,
	356	!ptlrpc_import_in_recovery(imp), &lwi);
	357	CDEBUG(D_HA, "%s: recovery finished\n",
	358	obd2cli_tgt(imp->imp_obd));
	359	}
d7e09d03 PT	360
	361	out:
	362	return rc;
	363	}
	364	EXPORT_SYMBOL(ptlrpc_recover_import);
	365
	366	int ptlrpc_import_in_recovery(struct obd_import *imp)
	367	{
	368	int in_recovery = 1;
88291a7a	369
d7e09d03 PT	370	spin_lock(&imp->imp_lock);
	371	if (imp->imp_state == LUSTRE_IMP_FULL \|\|
	372	imp->imp_state == LUSTRE_IMP_CLOSED \|\|
88291a7a AD	373	imp->imp_state == LUSTRE_IMP_DISCON \|\|
88291a7a AD	374	imp->imp_obd->obd_no_recov)
d7e09d03 PT	375	in_recovery = 0;
d7e09d03 PT	376	spin_unlock(&imp->imp_lock);
88291a7a	377
d7e09d03 PT	378	return in_recovery;
d7e09d03 PT	379	}