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/*
 * RedirFS: Redirecting File System
 * Written by Frantisek Hrbata <frantisek.hrbata@redirfs.org>
 *
 * Copyright 2008 - 2010 Frantisek Hrbata
 * All rights reserved.
 *
 * This file is part of RedirFS.
 *
 * RedirFS 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 3 of the License, or
 * (at your option) any later version.
 *
 * RedirFS 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 RedirFS. If not, see <http://www.gnu.org/licenses/>.
 */

#include "rfs.h"

struct rfs_ops* rfs_ops_alloc(void)
{
    struct rfs_ops* rops;
    char* arr;

rops = kzalloc(sizeof(struct rfs_ops), GFP_KERNEL);
    arr  = kzalloc(sizeof(char) * REDIRFS_OP_END, GFP_KERNEL);

if (!rops || !arr)
    {
        kfree(rops);
        kfree(arr);
        return ERR_PTR(-ENOMEM);
    }

rops->arr = arr;
    atomic_set(&rops->count, 1);
    spin_lock_init(&rops->lock);

return rops;
}

struct rfs_ops* rfs_ops_get(struct rfs_ops* rops)
{
    if (!rops || IS_ERR(rops))
        return NULL;

spin_lock(&rops->lock);
    BUG_ON(!atomic_read(&rops->count));
    atomic_inc(&rops->count);
    spin_unlock(&rops->lock);
    return rops;
}

void rfs_ops_put(struct rfs_ops* rops)
{
    if (!rops || IS_ERR(rops))
        return;

spin_lock(&rops->lock);
    BUG_ON(!atomic_read(&rops->count));
    if (!atomic_dec_and_test(&rops->count)) {
        spin_unlock(&rops->lock);
        return;
    }

kfree(rops->arr);
    spin_unlock(&rops->lock);
    kfree(rops);
}

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