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99 lines
3.3 KiB
C++
99 lines
3.3 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <Kernel/Devices/Device.h>
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namespace Kernel {
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class BlockDevice;
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class AsyncBlockDeviceRequest : public AsyncDeviceRequest {
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public:
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enum RequestType {
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Read,
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Write
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};
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AsyncBlockDeviceRequest(Device& block_device, RequestType request_type,
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u64 block_index, u32 block_count, const UserOrKernelBuffer& buffer, size_t buffer_size);
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RequestType request_type() const { return m_request_type; }
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u64 block_index() const { return m_block_index; }
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u32 block_count() const { return m_block_count; }
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UserOrKernelBuffer& buffer() { return m_buffer; }
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const UserOrKernelBuffer& buffer() const { return m_buffer; }
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size_t buffer_size() const { return m_buffer_size; }
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virtual void start() override;
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virtual const char* name() const override
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{
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switch (m_request_type) {
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case Read:
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return "BlockDeviceRequest (read)";
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case Write:
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return "BlockDeviceRequest (write)";
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default:
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VERIFY_NOT_REACHED();
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}
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}
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private:
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BlockDevice& m_block_device;
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const RequestType m_request_type;
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const u64 m_block_index;
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const u32 m_block_count;
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UserOrKernelBuffer m_buffer;
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const size_t m_buffer_size;
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};
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class BlockDevice : public Device {
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public:
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virtual ~BlockDevice() override;
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size_t block_size() const { return m_block_size; }
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virtual bool is_seekable() const override { return true; }
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bool read_block(u64 index, UserOrKernelBuffer&);
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bool write_block(u64 index, const UserOrKernelBuffer&);
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virtual void start_request(AsyncBlockDeviceRequest&) = 0;
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protected:
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BlockDevice(unsigned major, unsigned minor, size_t block_size = PAGE_SIZE)
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: Device(major, minor)
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, m_block_size(block_size)
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{
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}
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private:
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virtual bool is_block_device() const final { return true; }
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size_t m_block_size { 0 };
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};
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}
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