ladybird/Kernel/VM/SharedInodeVMObject.h

/*
 * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
 * 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.
 *
 * 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 HOLDER 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.
 */

#pragma once

#include <AK/Bitmap.h>
#include <Kernel/UnixTypes.h>
#include <Kernel/VM/InodeVMObject.h>

namespace Kernel {

class SharedInodeVMObject final : public InodeVMObject {
    AK_MAKE_NONMOVABLE(SharedInodeVMObject);

public:
    virtual ~SharedInodeVMObject() override;

    static NonnullRefPtr<SharedInodeVMObject> create_with_inode(Inode&);
    virtual NonnullRefPtr<VMObject> clone() override;

private:
    virtual bool is_shared_inode() const override { return true; }

    explicit SharedInodeVMObject(Inode&, size_t);
    explicit SharedInodeVMObject(const SharedInodeVMObject&);

    virtual const char* class_name() const override { return "SharedInodeVMObject"; }

    SharedInodeVMObject& operator=(const SharedInodeVMObject&) = delete;
};

}