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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.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) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
* Lustre is a trademark of Sun Microsystems, Inc.
*
* Implementation of cl_lock for VVP layer.
*
* Author: Nikita Danilov <nikita.danilov@sun.com>
*/
#define DEBUG_SUBSYSTEM S_LLITE
#include "../include/obd.h"
#include "../include/lustre_lite.h"
#include "vvp_internal.h"
/*****************************************************************************
*
* Vvp lock functions.
*
*/
/**
* Estimates lock value for the purpose of managing the lock cache during
* memory shortages.
*
* Locks for memory mapped files are almost infinitely precious, others are
* junk. "Mapped locks" are heavy, but not infinitely heavy, so that they are
* ordered within themselves by weights assigned from other layers.
*/
static unsigned long vvp_lock_weigh(const struct lu_env *env,
const struct cl_lock_slice *slice)
{
struct ccc_object *cob = cl2ccc(slice->cls_obj);
return atomic_read(&cob->cob_mmap_cnt) > 0 ? ~0UL >> 2 : 0;
}
static const struct cl_lock_operations vvp_lock_ops = {
.clo_delete = ccc_lock_delete,
.clo_fini = ccc_lock_fini,
.clo_enqueue = ccc_lock_enqueue,
.clo_wait = ccc_lock_wait,
.clo_unuse = ccc_lock_unuse,
.clo_fits_into = ccc_lock_fits_into,
.clo_state = ccc_lock_state,
.clo_weigh = vvp_lock_weigh
};
int vvp_lock_init(const struct lu_env *env, struct cl_object *obj,
struct cl_lock *lock, const struct cl_io *io)
{
return ccc_lock_init(env, obj, lock, io, &vvp_lock_ops);
}
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