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Kernel: Implement RamdiskDevice
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Kernel/Storage/RamdiskDevice.cpp
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85
Kernel/Storage/RamdiskDevice.cpp
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/*
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* Copyright (c) 2021, the SerenityOS developers
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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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#include <AK/Memory.h>
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#include <AK/StringView.h>
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#include <Kernel/FileSystem/FileDescription.h>
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#include <Kernel/Storage/RamdiskController.h>
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#include <Kernel/Storage/RamdiskDevice.h>
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namespace Kernel {
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NonnullRefPtr<RamdiskDevice> RamdiskDevice::create(const RamdiskController& controller, OwnPtr<Region>&& region, int major, int minor)
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{
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return adopt(*new RamdiskDevice(controller, move(region), major, minor));
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}
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RamdiskDevice::RamdiskDevice(const RamdiskController& controller, OwnPtr<Region>&& region, int major, int minor)
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: StorageDevice(controller, major, minor, 512, 0)
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, m_region(move(region))
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{
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klog() << "Ramdisk: Device #" << minor << " @ " << m_region->vaddr() << " length " << m_region->size();
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}
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RamdiskDevice::~RamdiskDevice()
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{
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}
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const char* RamdiskDevice::class_name() const
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{
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return "RamdiskDevice";
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}
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size_t RamdiskDevice::max_addressable_block() const
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{
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return m_region->size() / 512;
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}
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void RamdiskDevice::start_request(AsyncBlockDeviceRequest& request)
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{
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LOCKER(m_lock);
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u8* base = m_region->vaddr().as_ptr();
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size_t size = m_region->size();
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u8* offset = base + request.block_index() * 512;
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size_t length = request.block_count() * 512;
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if ((offset + length > base + size) || (offset + length < base)) {
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request.complete(AsyncDeviceRequest::Failure);
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} else {
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bool success;
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if (request.request_type() == AsyncBlockDeviceRequest::Read) {
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success = request.buffer().write(offset, length);
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} else {
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success = request.buffer().read(offset, length);
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}
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request.complete(success ? AsyncDeviceRequest::Success : AsyncDeviceRequest::MemoryFault);
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}
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}
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}
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