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/*
* 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 <Kernel/Devices/Device.h>
namespace Kernel {
class BlockDevice : public Device {
public:
virtual ~BlockDevice() override;
size_t block_size() const { return m_block_size; }
virtual bool is_seekable() const override { return true; }
bool read_block(unsigned index, UserOrKernelBuffer&) const;
bool write_block(unsigned index, const UserOrKernelBuffer&);
bool read_raw(u32 offset, unsigned length, UserOrKernelBuffer&) const;
bool write_raw(u32 offset, unsigned length, const UserOrKernelBuffer&);
virtual bool read_blocks(unsigned index, u16 count, UserOrKernelBuffer&) = 0;
virtual bool write_blocks(unsigned index, u16 count, const UserOrKernelBuffer&) = 0;
protected:
BlockDevice(unsigned major, unsigned minor, size_t block_size = PAGE_SIZE)
: Device(major, minor)
, m_block_size(block_size)
{
}
private:
virtual bool is_block_device() const final { return true; }
size_t m_block_size { 0 };
};
}
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