mirror of
https://github.com/RGBCube/serenity
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1102089f9f
In the near future, we will be able to figure out connections between storage devices and their partitions, so there's no need to hardcode 16 partitions per storage device - each storage device should be able to have "infinite" count of partitions in it, and we should be able to use and figure out about them.
62 lines
2.2 KiB
C++
62 lines
2.2 KiB
C++
/*
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* Copyright (c) 2021, the SerenityOS developers.
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*
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* SPDX-License-Identifier: BSD-2-Clause
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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/Devices/DeviceManagement.h>
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#include <Kernel/FileSystem/OpenFileDescription.h>
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#include <Kernel/Storage/Ramdisk/Controller.h>
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#include <Kernel/Storage/Ramdisk/Device.h>
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namespace Kernel {
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NonnullRefPtr<RamdiskDevice> RamdiskDevice::create(RamdiskController const& controller, NonnullOwnPtr<Memory::Region>&& region, int major, int minor)
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{
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auto device_name = MUST(KString::formatted("ramdisk{}", minor));
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auto device_or_error = DeviceManagement::try_create_device<RamdiskDevice>(controller, move(region), major, minor, move(device_name));
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// FIXME: Find a way to propagate errors
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VERIFY(!device_or_error.is_error());
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return device_or_error.release_value();
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}
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RamdiskDevice::RamdiskDevice(RamdiskController const& controller, NonnullOwnPtr<Memory::Region>&& region, int major, int minor, NonnullOwnPtr<KString> device_name)
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: StorageDevice(LUNAddress { controller.controller_id(), 0, 0 }, major, minor, 512, region->size() / 512, move(device_name))
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, m_region(move(region))
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{
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dmesgln("Ramdisk: Device #{} @ {}, Capacity={}", minor, m_region->vaddr(), max_addressable_block() * 512);
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}
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RamdiskDevice::~RamdiskDevice() = default;
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StringView RamdiskDevice::class_name() const
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{
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return "RamdiskDevice"sv;
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}
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void RamdiskDevice::start_request(AsyncBlockDeviceRequest& request)
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{
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MutexLocker 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() * request.block_size();
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size_t length = request.buffer_size();
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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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ErrorOr<void> result;
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if (request.request_type() == AsyncBlockDeviceRequest::Read) {
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result = request.buffer().write(offset, length);
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} else {
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result = request.buffer().read(offset, length);
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}
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request.complete(!result.is_error() ? AsyncDeviceRequest::Success : AsyncDeviceRequest::MemoryFault);
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}
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}
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}
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