/*
 * Copyright (c) 2025 Ian Marco Moffett and the Osmora Team.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of Hyra nor the names of its
 *    contributors may be used to endorse or promote products derived from
 *    this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/errno.h>
#include <os/vnode.h>
#include <vm/kalloc.h>
#include <lib/string.h>

int
vnode_init(struct vnode **vp_res, vtype_t type)
{
    struct vnode *vp;

    if (vp_res == NULL) {
        return -EINVAL;
    }

    switch (type) {
    case VREG:
    case VDIR:
    case VCHR:
    case VBLK:
        break;
    default:
        return -EINVAL;
    }

    vp = kalloc(sizeof(*vp));
    if (vp == NULL) {
        return -ENOMEM;
    }

    memset(vp, 0, sizeof(*vp));
    vp->ref = 1;
    vp->type = type;
    *vp_res = vp;
    return 0;
}

int
vnode_release(struct vnode *vp)
{
    struct vops *vops;

    if (vp == NULL) {
        return -EINVAL;
    }

    vops = &vp->vops;

    /*
     * If there are zero outstanding references to this
     * vnode, release it from memory.
     */
    if ((vp->ref--) > 0) {
        return vp->ref;
    }

    if (vops->reclaim != NULL) {
        vops->reclaim(vp);
    }

    kfree(vp);
    return 0;
}