cache_inode_weakref.c

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/*
 * vim:expandtab:shiftwidth=8:tabstop=8:
 *
 * Copyright (C) 2010, The Linux Box Corporation
 * Contributor : Matt Benjamin <matt@linuxbox.com>
 *
 * Some portions Copyright CEA/DAM/DIF  (2008)
 * contributeur : Philippe DENIEL   philippe.deniel@cea.fr
 *                Thomas LEIBOVICI  thomas.leibovici@cea.fr
 *
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation; either version 3 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301 USA
 *
 * -------------
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#ifdef _SOLARIS
#include "solaris_port.h"
#endif                          /* _SOLARIS */

#include <unistd.h>
#include <sys/types.h>
#include <sys/param.h>
#include <time.h>
#include <pthread.h>
#include <assert.h>
#include "nlm_list.h"
#include "fsal.h"
#include "nfs_core.h"
#include "log.h"
#include "cache_inode.h"
#include "cache_inode_lru.h"
#include "cache_inode_weakref.h"
#include "generic_weakref.h"

#define WEAKREF_PARTITIONS 17

static gweakref_table_t *cache_inode_wt = NULL;

void cache_inode_weakref_init()
{
    cache_inode_wt = gweakref_init(17, 32767 /* unlike in ht, desire prime */);
}

gweakref_t cache_inode_weakref_insert(cache_entry_t *entry)
{
    return (gweakref_insert(cache_inode_wt, entry));
}

cache_entry_t *cache_inode_weakref_get(gweakref_t *ref,
                                       uint32_t flags)
{
    pthread_rwlock_t *lock = NULL;
    cache_entry_t *entry =
        (cache_entry_t *) gweakref_lookupex(cache_inode_wt, ref, &lock);

    if (entry) {
        if (cache_inode_lru_ref(entry, flags)
            != CACHE_INODE_SUCCESS) {
            pthread_rwlock_unlock(lock);
            return NULL;
        }
        pthread_rwlock_unlock(lock);
    }

    return (entry);
}

void cache_inode_weakref_delete(gweakref_t *ref)
{
    gweakref_delete(cache_inode_wt, ref);
}

void cache_inode_weakref_shutdown()
{
    gweakref_destroy(cache_inode_wt);
}