fs/ocfs2/dlm/dlmdebug.c - kernel/msm-4.19 - Gitiles

 /* -*- mode: c; c-basic-offset: 8; -*-
  * vim: noexpandtab sw=8 ts=8 sts=0:
  *
  * dlmdebug.c
  *
  * debug functionality for the dlm
  *
  * Copyright (C) 2004 Oracle.  All rights reserved.
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * 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 for more details.
  *
  * You should have received a copy of the GNU General Public
  * License along with this program; if not, write to the
  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  * Boston, MA 021110-1307, USA.
  *
  */

 #include <linux/types.h>
 #include <linux/slab.h>
 #include <linux/highmem.h>
 #include <linux/utsname.h>
 #include <linux/sysctl.h>
 #include <linux/spinlock.h>

 #include "cluster/heartbeat.h"
 #include "cluster/nodemanager.h"
 #include "cluster/tcp.h"

 #include "dlmapi.h"
 #include "dlmcommon.h"
 #include "dlmdebug.h"

 #include "dlmdomain.h"
 #include "dlmdebug.h"

 #define MLOG_MASK_PREFIX ML_DLM
 #include "cluster/masklog.h"

 void dlm_print_one_lock_resource(struct dlm_lock_resource *res)
 {
 	mlog(ML_NOTICE, "lockres: %.*s, owner=%u, state=%u\n",
 	       res->lockname.len, res->lockname.name,
 	       res->owner, res->state);
 	spin_lock(&res->spinlock);
 	__dlm_print_one_lock_resource(res);
 	spin_unlock(&res->spinlock);
 }

 void __dlm_print_one_lock_resource(struct dlm_lock_resource *res)
 {
 	struct list_head *iter2;
 	struct dlm_lock *lock;

 	assert_spin_locked(&res->spinlock);

 	mlog(ML_NOTICE, "lockres: %.*s, owner=%u, state=%u\n",
 	       res->lockname.len, res->lockname.name,
 	       res->owner, res->state);
 	mlog(ML_NOTICE, "  last used: %lu, on purge list: %s\n",
 	     res->last_used, list_empty(&res->purge) ? "no" : "yes");
 	mlog(ML_NOTICE, "  granted queue: \n");
 	list_for_each(iter2, &res->granted) {
 		lock = list_entry(iter2, struct dlm_lock, list);
 		spin_lock(&lock->spinlock);
 		mlog(ML_NOTICE, "    type=%d, conv=%d, node=%u, "
 		       "cookie=%u:%llu, ast=(empty=%c,pend=%c), bast=(empty=%c,pend=%c)\n",
 		       lock->ml.type, lock->ml.convert_type, lock->ml.node,
 		       dlm_get_lock_cookie_node(lock->ml.cookie),
 		       dlm_get_lock_cookie_seq(lock->ml.cookie),
 		       list_empty(&lock->ast_list) ? 'y' : 'n',
 		       lock->ast_pending ? 'y' : 'n',
 		       list_empty(&lock->bast_list) ? 'y' : 'n',
 		       lock->bast_pending ? 'y' : 'n');
 		spin_unlock(&lock->spinlock);
 	}
 	mlog(ML_NOTICE, "  converting queue: \n");
 	list_for_each(iter2, &res->converting) {
 		lock = list_entry(iter2, struct dlm_lock, list);
 		spin_lock(&lock->spinlock);
 		mlog(ML_NOTICE, "    type=%d, conv=%d, node=%u, "
 		       "cookie=%u:%llu, ast=(empty=%c,pend=%c), bast=(empty=%c,pend=%c)\n",
 		       lock->ml.type, lock->ml.convert_type, lock->ml.node,
 		       dlm_get_lock_cookie_node(lock->ml.cookie),
 		       dlm_get_lock_cookie_seq(lock->ml.cookie),
 		       list_empty(&lock->ast_list) ? 'y' : 'n',
 		       lock->ast_pending ? 'y' : 'n',
 		       list_empty(&lock->bast_list) ? 'y' : 'n',
 		       lock->bast_pending ? 'y' : 'n');
 		spin_unlock(&lock->spinlock);
 	}
 	mlog(ML_NOTICE, "  blocked queue: \n");
 	list_for_each(iter2, &res->blocked) {
 		lock = list_entry(iter2, struct dlm_lock, list);
 		spin_lock(&lock->spinlock);
 		mlog(ML_NOTICE, "    type=%d, conv=%d, node=%u, "
 		       "cookie=%u:%llu, ast=(empty=%c,pend=%c), bast=(empty=%c,pend=%c)\n",
 		       lock->ml.type, lock->ml.convert_type, lock->ml.node,
 		       dlm_get_lock_cookie_node(lock->ml.cookie),
 		       dlm_get_lock_cookie_seq(lock->ml.cookie),
 		       list_empty(&lock->ast_list) ? 'y' : 'n',
 		       lock->ast_pending ? 'y' : 'n',
 		       list_empty(&lock->bast_list) ? 'y' : 'n',
 		       lock->bast_pending ? 'y' : 'n');
 		spin_unlock(&lock->spinlock);
 	}
 }

 void dlm_print_one_lock(struct dlm_lock *lockid)
 {
 	dlm_print_one_lock_resource(lockid->lockres);
 }
 EXPORT_SYMBOL_GPL(dlm_print_one_lock);

 void dlm_dump_lock_resources(struct dlm_ctxt *dlm)
 {
 	struct dlm_lock_resource *res;
 	struct hlist_node *iter;
 	struct hlist_head *bucket;
 	int i;

 	mlog(ML_NOTICE, "struct dlm_ctxt: %s, node=%u, key=%u\n",
 		  dlm->name, dlm->node_num, dlm->key);
 	if (!dlm || !dlm->name) {
 		mlog(ML_ERROR, "dlm=%p\n", dlm);
 		return;
 	}

 	spin_lock(&dlm->spinlock);
 	for (i=0; i<DLM_HASH_BUCKETS; i++) {
 		bucket = &(dlm->lockres_hash[i]);
 		hlist_for_each_entry(res, iter, bucket, hash_node)
 			dlm_print_one_lock_resource(res);
 	}
 	spin_unlock(&dlm->spinlock);
 }

 static const char *dlm_errnames[] = {
 	[DLM_NORMAL] =			"DLM_NORMAL",
 	[DLM_GRANTED] =			"DLM_GRANTED",
 	[DLM_DENIED] =			"DLM_DENIED",
 	[DLM_DENIED_NOLOCKS] =		"DLM_DENIED_NOLOCKS",
 	[DLM_WORKING] =			"DLM_WORKING",
 	[DLM_BLOCKED] =			"DLM_BLOCKED",
 	[DLM_BLOCKED_ORPHAN] =		"DLM_BLOCKED_ORPHAN",
 	[DLM_DENIED_GRACE_PERIOD] =	"DLM_DENIED_GRACE_PERIOD",
 	[DLM_SYSERR] =			"DLM_SYSERR",
 	[DLM_NOSUPPORT] =		"DLM_NOSUPPORT",
 	[DLM_CANCELGRANT] =		"DLM_CANCELGRANT",
 	[DLM_IVLOCKID] =		"DLM_IVLOCKID",
 	[DLM_SYNC] =			"DLM_SYNC",
 	[DLM_BADTYPE] =			"DLM_BADTYPE",
 	[DLM_BADRESOURCE] =		"DLM_BADRESOURCE",
 	[DLM_MAXHANDLES] =		"DLM_MAXHANDLES",
 	[DLM_NOCLINFO] =		"DLM_NOCLINFO",
 	[DLM_NOLOCKMGR] =		"DLM_NOLOCKMGR",
 	[DLM_NOPURGED] =		"DLM_NOPURGED",
 	[DLM_BADARGS] =			"DLM_BADARGS",
 	[DLM_VOID] =			"DLM_VOID",
 	[DLM_NOTQUEUED] =		"DLM_NOTQUEUED",
 	[DLM_IVBUFLEN] =		"DLM_IVBUFLEN",
 	[DLM_CVTUNGRANT] =		"DLM_CVTUNGRANT",
 	[DLM_BADPARAM] =		"DLM_BADPARAM",
 	[DLM_VALNOTVALID] =		"DLM_VALNOTVALID",
 	[DLM_REJECTED] =		"DLM_REJECTED",
 	[DLM_ABORT] =			"DLM_ABORT",
 	[DLM_CANCEL] =			"DLM_CANCEL",
 	[DLM_IVRESHANDLE] =		"DLM_IVRESHANDLE",
 	[DLM_DEADLOCK] =		"DLM_DEADLOCK",
 	[DLM_DENIED_NOASTS] =		"DLM_DENIED_NOASTS",
 	[DLM_FORWARD] =			"DLM_FORWARD",
 	[DLM_TIMEOUT] =			"DLM_TIMEOUT",
 	[DLM_IVGROUPID] =		"DLM_IVGROUPID",
 	[DLM_VERS_CONFLICT] =		"DLM_VERS_CONFLICT",
 	[DLM_BAD_DEVICE_PATH] =		"DLM_BAD_DEVICE_PATH",
 	[DLM_NO_DEVICE_PERMISSION] =	"DLM_NO_DEVICE_PERMISSION",
 	[DLM_NO_CONTROL_DEVICE ] =	"DLM_NO_CONTROL_DEVICE ",
 	[DLM_RECOVERING] =		"DLM_RECOVERING",
 	[DLM_MIGRATING] =		"DLM_MIGRATING",
 	[DLM_MAXSTATS] =		"DLM_MAXSTATS",
 };

 static const char *dlm_errmsgs[] = {
 	[DLM_NORMAL] = 			"request in progress",
 	[DLM_GRANTED] = 		"request granted",
 	[DLM_DENIED] = 			"request denied",
 	[DLM_DENIED_NOLOCKS] = 		"request denied, out of system resources",
 	[DLM_WORKING] = 		"async request in progress",
 	[DLM_BLOCKED] = 		"lock request blocked",
 	[DLM_BLOCKED_ORPHAN] = 		"lock request blocked by a orphan lock",
 	[DLM_DENIED_GRACE_PERIOD] = 	"topological change in progress",
 	[DLM_SYSERR] = 			"system error",
 	[DLM_NOSUPPORT] = 		"unsupported",
 	[DLM_CANCELGRANT] = 		"can't cancel convert: already granted",
 	[DLM_IVLOCKID] = 		"bad lockid",
 	[DLM_SYNC] = 			"synchronous request granted",
 	[DLM_BADTYPE] = 		"bad resource type",
 	[DLM_BADRESOURCE] = 		"bad resource handle",
 	[DLM_MAXHANDLES] = 		"no more resource handles",
 	[DLM_NOCLINFO] = 		"can't contact cluster manager",
 	[DLM_NOLOCKMGR] = 		"can't contact lock manager",
 	[DLM_NOPURGED] = 		"can't contact purge daemon",
 	[DLM_BADARGS] = 		"bad api args",
 	[DLM_VOID] = 			"no status",
 	[DLM_NOTQUEUED] = 		"NOQUEUE was specified and request failed",
 	[DLM_IVBUFLEN] = 		"invalid resource name length",
 	[DLM_CVTUNGRANT] = 		"attempted to convert ungranted lock",
 	[DLM_BADPARAM] = 		"invalid lock mode specified",
 	[DLM_VALNOTVALID] = 		"value block has been invalidated",
 	[DLM_REJECTED] = 		"request rejected, unrecognized client",
 	[DLM_ABORT] = 			"blocked lock request cancelled",
 	[DLM_CANCEL] = 			"conversion request cancelled",
 	[DLM_IVRESHANDLE] = 		"invalid resource handle",
 	[DLM_DEADLOCK] = 		"deadlock recovery refused this request",
 	[DLM_DENIED_NOASTS] = 		"failed to allocate AST",
 	[DLM_FORWARD] = 		"request must wait for primary's response",
 	[DLM_TIMEOUT] = 		"timeout value for lock has expired",
 	[DLM_IVGROUPID] = 		"invalid group specification",
 	[DLM_VERS_CONFLICT] = 		"version conflicts prevent request handling",
 	[DLM_BAD_DEVICE_PATH] = 	"Locks device does not exist or path wrong",
 	[DLM_NO_DEVICE_PERMISSION] = 	"Client has insufficient perms for device",
 	[DLM_NO_CONTROL_DEVICE] = 	"Cannot set options on opened device ",
 	[DLM_RECOVERING] = 		"lock resource being recovered",
 	[DLM_MIGRATING] = 		"lock resource being migrated",
 	[DLM_MAXSTATS] = 		"invalid error number",
 };

 const char *dlm_errmsg(enum dlm_status err)
 {
 	if (err >= DLM_MAXSTATS || err < 0)
 		return dlm_errmsgs[DLM_MAXSTATS];
 	return dlm_errmsgs[err];
 }
 EXPORT_SYMBOL_GPL(dlm_errmsg);

 const char *dlm_errname(enum dlm_status err)
 {
 	if (err >= DLM_MAXSTATS || err < 0)
 		return dlm_errnames[DLM_MAXSTATS];
 	return dlm_errnames[err];
 }
 EXPORT_SYMBOL_GPL(dlm_errname);
	/* -- mode: c; c-basic-offset: 8; --
	* vim: noexpandtab sw=8 ts=8 sts=0:
	*
	* dlmdebug.c
	*
	* debug functionality for the dlm
	*
	* Copyright (C) 2004 Oracle. All rights reserved.
	*
	* This program is free software; you can redistribute it and/or
	* modify it under the terms of the GNU General Public
	* License as published by the Free Software Foundation; either
	* version 2 of the License, or (at your option) any later version.
	*
	* 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 for more details.
	*
	* You should have received a copy of the GNU General Public
	* License along with this program; if not, write to the
	* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
	* Boston, MA 021110-1307, USA.
	*
	*/

	#include <linux/types.h>
	#include <linux/slab.h>
	#include <linux/highmem.h>
	#include <linux/utsname.h>
	#include <linux/sysctl.h>
	#include <linux/spinlock.h>

	#include "cluster/heartbeat.h"
	#include "cluster/nodemanager.h"
	#include "cluster/tcp.h"

	#include "dlmapi.h"
	#include "dlmcommon.h"
	#include "dlmdebug.h"

	#include "dlmdomain.h"
	#include "dlmdebug.h"

	#define MLOG_MASK_PREFIX ML_DLM
	#include "cluster/masklog.h"

	void dlm_print_one_lock_resource(struct dlm_lock_resource *res)
	{
	mlog(ML_NOTICE, "lockres: %.*s, owner=%u, state=%u\n",
	res->lockname.len, res->lockname.name,
	res->owner, res->state);
	spin_lock(&res->spinlock);
	__dlm_print_one_lock_resource(res);
	spin_unlock(&res->spinlock);
	}

	void __dlm_print_one_lock_resource(struct dlm_lock_resource *res)
	{
	struct list_head *iter2;
	struct dlm_lock *lock;

	assert_spin_locked(&res->spinlock);

	mlog(ML_NOTICE, "lockres: %.*s, owner=%u, state=%u\n",
	res->lockname.len, res->lockname.name,
	res->owner, res->state);
	mlog(ML_NOTICE, " last used: %lu, on purge list: %s\n",
	res->last_used, list_empty(&res->purge) ? "no" : "yes");
	mlog(ML_NOTICE, " granted queue: \n");
	list_for_each(iter2, &res->granted) {
	lock = list_entry(iter2, struct dlm_lock, list);
	spin_lock(&lock->spinlock);
	mlog(ML_NOTICE, " type=%d, conv=%d, node=%u, "
	"cookie=%u:%llu, ast=(empty=%c,pend=%c), bast=(empty=%c,pend=%c)\n",
	lock->ml.type, lock->ml.convert_type, lock->ml.node,
	dlm_get_lock_cookie_node(lock->ml.cookie),
	dlm_get_lock_cookie_seq(lock->ml.cookie),
	list_empty(&lock->ast_list) ? 'y' : 'n',
	lock->ast_pending ? 'y' : 'n',
	list_empty(&lock->bast_list) ? 'y' : 'n',
	lock->bast_pending ? 'y' : 'n');
	spin_unlock(&lock->spinlock);
	}
	mlog(ML_NOTICE, " converting queue: \n");
	list_for_each(iter2, &res->converting) {
	lock = list_entry(iter2, struct dlm_lock, list);
	spin_lock(&lock->spinlock);
	mlog(ML_NOTICE, " type=%d, conv=%d, node=%u, "
	"cookie=%u:%llu, ast=(empty=%c,pend=%c), bast=(empty=%c,pend=%c)\n",
	lock->ml.type, lock->ml.convert_type, lock->ml.node,
	dlm_get_lock_cookie_node(lock->ml.cookie),
	dlm_get_lock_cookie_seq(lock->ml.cookie),
	list_empty(&lock->ast_list) ? 'y' : 'n',
	lock->ast_pending ? 'y' : 'n',
	list_empty(&lock->bast_list) ? 'y' : 'n',
	lock->bast_pending ? 'y' : 'n');
	spin_unlock(&lock->spinlock);
	}
	mlog(ML_NOTICE, " blocked queue: \n");
	list_for_each(iter2, &res->blocked) {
	lock = list_entry(iter2, struct dlm_lock, list);
	spin_lock(&lock->spinlock);
	mlog(ML_NOTICE, " type=%d, conv=%d, node=%u, "
	"cookie=%u:%llu, ast=(empty=%c,pend=%c), bast=(empty=%c,pend=%c)\n",
	lock->ml.type, lock->ml.convert_type, lock->ml.node,
	dlm_get_lock_cookie_node(lock->ml.cookie),
	dlm_get_lock_cookie_seq(lock->ml.cookie),
	list_empty(&lock->ast_list) ? 'y' : 'n',
	lock->ast_pending ? 'y' : 'n',
	list_empty(&lock->bast_list) ? 'y' : 'n',
	lock->bast_pending ? 'y' : 'n');
	spin_unlock(&lock->spinlock);
	}
	}

	void dlm_print_one_lock(struct dlm_lock *lockid)
	{
	dlm_print_one_lock_resource(lockid->lockres);
	}
	EXPORT_SYMBOL_GPL(dlm_print_one_lock);

	void dlm_dump_lock_resources(struct dlm_ctxt *dlm)
	{
	struct dlm_lock_resource *res;
	struct hlist_node *iter;
	struct hlist_head *bucket;
	int i;

	mlog(ML_NOTICE, "struct dlm_ctxt: %s, node=%u, key=%u\n",
	dlm->name, dlm->node_num, dlm->key);
	if (!dlm \|\| !dlm->name) {
	mlog(ML_ERROR, "dlm=%p\n", dlm);
	return;
	}

	spin_lock(&dlm->spinlock);
	for (i=0; i<DLM_HASH_BUCKETS; i++) {
	bucket = &(dlm->lockres_hash[i]);
	hlist_for_each_entry(res, iter, bucket, hash_node)
	dlm_print_one_lock_resource(res);
	}
	spin_unlock(&dlm->spinlock);
	}

	static const char *dlm_errnames[] = {
	[DLM_NORMAL] = "DLM_NORMAL",
	[DLM_GRANTED] = "DLM_GRANTED",
	[DLM_DENIED] = "DLM_DENIED",
	[DLM_DENIED_NOLOCKS] = "DLM_DENIED_NOLOCKS",
	[DLM_WORKING] = "DLM_WORKING",
	[DLM_BLOCKED] = "DLM_BLOCKED",
	[DLM_BLOCKED_ORPHAN] = "DLM_BLOCKED_ORPHAN",
	[DLM_DENIED_GRACE_PERIOD] = "DLM_DENIED_GRACE_PERIOD",
	[DLM_SYSERR] = "DLM_SYSERR",
	[DLM_NOSUPPORT] = "DLM_NOSUPPORT",
	[DLM_CANCELGRANT] = "DLM_CANCELGRANT",
	[DLM_IVLOCKID] = "DLM_IVLOCKID",
	[DLM_SYNC] = "DLM_SYNC",
	[DLM_BADTYPE] = "DLM_BADTYPE",
	[DLM_BADRESOURCE] = "DLM_BADRESOURCE",
	[DLM_MAXHANDLES] = "DLM_MAXHANDLES",
	[DLM_NOCLINFO] = "DLM_NOCLINFO",
	[DLM_NOLOCKMGR] = "DLM_NOLOCKMGR",
	[DLM_NOPURGED] = "DLM_NOPURGED",
	[DLM_BADARGS] = "DLM_BADARGS",
	[DLM_VOID] = "DLM_VOID",
	[DLM_NOTQUEUED] = "DLM_NOTQUEUED",
	[DLM_IVBUFLEN] = "DLM_IVBUFLEN",
	[DLM_CVTUNGRANT] = "DLM_CVTUNGRANT",
	[DLM_BADPARAM] = "DLM_BADPARAM",
	[DLM_VALNOTVALID] = "DLM_VALNOTVALID",
	[DLM_REJECTED] = "DLM_REJECTED",
	[DLM_ABORT] = "DLM_ABORT",
	[DLM_CANCEL] = "DLM_CANCEL",
	[DLM_IVRESHANDLE] = "DLM_IVRESHANDLE",
	[DLM_DEADLOCK] = "DLM_DEADLOCK",
	[DLM_DENIED_NOASTS] = "DLM_DENIED_NOASTS",
	[DLM_FORWARD] = "DLM_FORWARD",
	[DLM_TIMEOUT] = "DLM_TIMEOUT",
	[DLM_IVGROUPID] = "DLM_IVGROUPID",
	[DLM_VERS_CONFLICT] = "DLM_VERS_CONFLICT",
	[DLM_BAD_DEVICE_PATH] = "DLM_BAD_DEVICE_PATH",
	[DLM_NO_DEVICE_PERMISSION] = "DLM_NO_DEVICE_PERMISSION",
	[DLM_NO_CONTROL_DEVICE ] = "DLM_NO_CONTROL_DEVICE ",
	[DLM_RECOVERING] = "DLM_RECOVERING",
	[DLM_MIGRATING] = "DLM_MIGRATING",
	[DLM_MAXSTATS] = "DLM_MAXSTATS",
	};

	static const char *dlm_errmsgs[] = {
	[DLM_NORMAL] = "request in progress",
	[DLM_GRANTED] = "request granted",
	[DLM_DENIED] = "request denied",
	[DLM_DENIED_NOLOCKS] = "request denied, out of system resources",
	[DLM_WORKING] = "async request in progress",
	[DLM_BLOCKED] = "lock request blocked",
	[DLM_BLOCKED_ORPHAN] = "lock request blocked by a orphan lock",
	[DLM_DENIED_GRACE_PERIOD] = "topological change in progress",
	[DLM_SYSERR] = "system error",
	[DLM_NOSUPPORT] = "unsupported",
	[DLM_CANCELGRANT] = "can't cancel convert: already granted",
	[DLM_IVLOCKID] = "bad lockid",
	[DLM_SYNC] = "synchronous request granted",
	[DLM_BADTYPE] = "bad resource type",
	[DLM_BADRESOURCE] = "bad resource handle",
	[DLM_MAXHANDLES] = "no more resource handles",
	[DLM_NOCLINFO] = "can't contact cluster manager",
	[DLM_NOLOCKMGR] = "can't contact lock manager",
	[DLM_NOPURGED] = "can't contact purge daemon",
	[DLM_BADARGS] = "bad api args",
	[DLM_VOID] = "no status",
	[DLM_NOTQUEUED] = "NOQUEUE was specified and request failed",
	[DLM_IVBUFLEN] = "invalid resource name length",
	[DLM_CVTUNGRANT] = "attempted to convert ungranted lock",
	[DLM_BADPARAM] = "invalid lock mode specified",
	[DLM_VALNOTVALID] = "value block has been invalidated",
	[DLM_REJECTED] = "request rejected, unrecognized client",
	[DLM_ABORT] = "blocked lock request cancelled",
	[DLM_CANCEL] = "conversion request cancelled",
	[DLM_IVRESHANDLE] = "invalid resource handle",
	[DLM_DEADLOCK] = "deadlock recovery refused this request",
	[DLM_DENIED_NOASTS] = "failed to allocate AST",
	[DLM_FORWARD] = "request must wait for primary's response",
	[DLM_TIMEOUT] = "timeout value for lock has expired",
	[DLM_IVGROUPID] = "invalid group specification",
	[DLM_VERS_CONFLICT] = "version conflicts prevent request handling",
	[DLM_BAD_DEVICE_PATH] = "Locks device does not exist or path wrong",
	[DLM_NO_DEVICE_PERMISSION] = "Client has insufficient perms for device",
	[DLM_NO_CONTROL_DEVICE] = "Cannot set options on opened device ",
	[DLM_RECOVERING] = "lock resource being recovered",
	[DLM_MIGRATING] = "lock resource being migrated",
	[DLM_MAXSTATS] = "invalid error number",
	};

	const char *dlm_errmsg(enum dlm_status err)
	{
	if (err >= DLM_MAXSTATS \|\| err < 0)
	return dlm_errmsgs[DLM_MAXSTATS];
	return dlm_errmsgs[err];
	}
	EXPORT_SYMBOL_GPL(dlm_errmsg);

	const char *dlm_errname(enum dlm_status err)
	{
	if (err >= DLM_MAXSTATS \|\| err < 0)
	return dlm_errnames[DLM_MAXSTATS];
	return dlm_errnames[err];
	}
	EXPORT_SYMBOL_GPL(dlm_errname);