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https://github.com/RGBCube/serenity
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aee4786d8e
This singleton simplifies many aspects that we struggled with before: 1. There's no need to make derived classes of Device expose the constructor as public anymore. The singleton is a friend of them, so he can call the constructor. This solves the issue with try_create_device helper neatly, hopefully for good. 2. Getting a reference of the NullDevice is now being done from this singleton, which means that NullDevice no longer needs to use its own singleton, and we can apply the try_create_device helper on it too :) 3. We can now defer registration completely after the Device constructor which means the Device constructor is merely assigning the major and minor numbers of the Device, and the try_create_device helper ensures it calls the after_inserting method immediately after construction. This creates a great opportunity to make registration more OOM-safe.
83 lines
2.9 KiB
C++
83 lines
2.9 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <Kernel/Debug.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/Partition/DiskPartition.h>
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namespace Kernel {
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NonnullRefPtr<DiskPartition> DiskPartition::create(BlockDevice& device, unsigned minor_number, DiskPartitionMetadata metadata)
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{
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auto partition_or_error = DeviceManagement::try_create_device<DiskPartition>(device, minor_number, metadata);
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// FIXME: Find a way to propagate errors
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VERIFY(!partition_or_error.is_error());
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return partition_or_error.release_value();
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}
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DiskPartition::DiskPartition(BlockDevice& device, unsigned minor_number, DiskPartitionMetadata metadata)
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: BlockDevice(100, minor_number, device.block_size())
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, m_device(device)
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, m_metadata(metadata)
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{
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}
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DiskPartition::~DiskPartition()
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{
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}
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const DiskPartitionMetadata& DiskPartition::metadata() const
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{
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return m_metadata;
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}
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void DiskPartition::start_request(AsyncBlockDeviceRequest& request)
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{
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auto device = m_device.strong_ref();
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if (!device)
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request.complete(AsyncBlockDeviceRequest::RequestResult::Failure);
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auto sub_request_or_error = device->try_make_request<AsyncBlockDeviceRequest>(request.request_type(),
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request.block_index() + m_metadata.start_block(), request.block_count(), request.buffer(), request.buffer_size());
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if (sub_request_or_error.is_error())
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TODO();
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request.add_sub_request(sub_request_or_error.release_value());
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}
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KResultOr<size_t> DiskPartition::read(OpenFileDescription& fd, u64 offset, UserOrKernelBuffer& outbuf, size_t len)
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{
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unsigned adjust = m_metadata.start_block() * block_size();
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dbgln_if(OFFD_DEBUG, "DiskPartition::read offset={}, adjust={}, len={}", fd.offset(), adjust, len);
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return m_device.strong_ref()->read(fd, offset + adjust, outbuf, len);
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}
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bool DiskPartition::can_read(const OpenFileDescription& fd, size_t offset) const
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{
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unsigned adjust = m_metadata.start_block() * block_size();
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dbgln_if(OFFD_DEBUG, "DiskPartition::can_read offset={}, adjust={}", offset, adjust);
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return m_device.strong_ref()->can_read(fd, offset + adjust);
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}
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KResultOr<size_t> DiskPartition::write(OpenFileDescription& fd, u64 offset, const UserOrKernelBuffer& inbuf, size_t len)
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{
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unsigned adjust = m_metadata.start_block() * block_size();
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dbgln_if(OFFD_DEBUG, "DiskPartition::write offset={}, adjust={}, len={}", offset, adjust, len);
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return m_device.strong_ref()->write(fd, offset + adjust, inbuf, len);
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}
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bool DiskPartition::can_write(const OpenFileDescription& fd, size_t offset) const
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{
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unsigned adjust = m_metadata.start_block() * block_size();
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dbgln_if(OFFD_DEBUG, "DiskPartition::can_write offset={}, adjust={}", offset, adjust);
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return m_device.strong_ref()->can_write(fd, offset + adjust);
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}
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StringView DiskPartition::class_name() const
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{
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return "DiskPartition";
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}
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}
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