86 lines
2.6 KiB
C
86 lines
2.6 KiB
C
/*
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* GPL HEADER START
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*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 only,
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License version 2 for more details (a copy is included
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* in the LICENSE file that accompanied this code).
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*
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* You should have received a copy of the GNU General Public License
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* version 2 along with this program; If not, see
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* http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*
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* GPL HEADER END
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*/
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/*
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* Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
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* Use is subject to license terms.
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*/
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/*
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* This file is part of Lustre, http://www.lustre.org/
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* Lustre is a trademark of Sun Microsystems, Inc.
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*
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* Implementation of cl_lock for VVP layer.
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*
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* Author: Nikita Danilov <nikita.danilov@sun.com>
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*/
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#define DEBUG_SUBSYSTEM S_LLITE
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#include "../include/obd.h"
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#include "../include/lustre_lite.h"
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#include "vvp_internal.h"
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/*****************************************************************************
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*
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* Vvp lock functions.
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*
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*/
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/**
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* Estimates lock value for the purpose of managing the lock cache during
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* memory shortages.
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*
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* Locks for memory mapped files are almost infinitely precious, others are
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* junk. "Mapped locks" are heavy, but not infinitely heavy, so that they are
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* ordered within themselves by weights assigned from other layers.
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*/
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static unsigned long vvp_lock_weigh(const struct lu_env *env,
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const struct cl_lock_slice *slice)
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{
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struct ccc_object *cob = cl2ccc(slice->cls_obj);
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return atomic_read(&cob->cob_mmap_cnt) > 0 ? ~0UL >> 2 : 0;
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}
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static const struct cl_lock_operations vvp_lock_ops = {
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.clo_delete = ccc_lock_delete,
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.clo_fini = ccc_lock_fini,
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.clo_enqueue = ccc_lock_enqueue,
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.clo_wait = ccc_lock_wait,
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.clo_use = ccc_lock_use,
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.clo_unuse = ccc_lock_unuse,
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.clo_fits_into = ccc_lock_fits_into,
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.clo_state = ccc_lock_state,
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.clo_weigh = vvp_lock_weigh
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};
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int vvp_lock_init(const struct lu_env *env, struct cl_object *obj,
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struct cl_lock *lock, const struct cl_io *io)
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{
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return ccc_lock_init(env, obj, lock, io, &vvp_lock_ops);
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}
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