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/*
* 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.gnu.org/licenses/gpl-2.0.html
*
* GPL HEADER END
*/
/*
* Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
*
* Copyright (c) 2012, Intel Corporation.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
* Lustre is a trademark of Sun Microsystems, Inc.
*/
#define DEBUG_SUBSYSTEM S_LDLM
#include "../../include/linux/libcfs/libcfs.h"
#include "../include/lustre_dlm.h"
#include "../include/lustre_lib.h"
/**
* Lock a lock and its resource.
*
* LDLM locking uses resource to serialize access to locks
* but there is a case when we change resource of lock upon
* enqueue reply. We rely on lock->l_resource = new_res
* being an atomic operation.
*/
struct ldlm_resource *lock_res_and_lock(struct ldlm_lock *lock)
__acquires(&lock->l_lock)
__acquires(&lock->l_resource->lr_lock)
{
spin_lock(&lock->l_lock);
lock_res(lock->l_resource);
ldlm_set_res_locked(lock);
return lock->l_resource;
}
EXPORT_SYMBOL(lock_res_and_lock);
/**
* Unlock a lock and its resource previously locked with lock_res_and_lock
*/
void unlock_res_and_lock(struct ldlm_lock *lock)
__releases(&lock->l_resource->lr_lock)
__releases(&lock->l_lock)
{
/* on server-side resource of lock doesn't change */
ldlm_clear_res_locked(lock);
unlock_res(lock->l_resource);
spin_unlock(&lock->l_lock);
}
EXPORT_SYMBOL(unlock_res_and_lock);
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