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b91c49364d
This makes it more symmetrical with adopt_own() (which is used to create a NonnullOwnPtr from the result of a naked new.)
80 lines
2.6 KiB
C++
80 lines
2.6 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/FileSystem/FileDescription.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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return adopt_ref(*new DiskPartition(device, minor_number, metadata));
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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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request.add_sub_request(m_device->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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}
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KResultOr<size_t> DiskPartition::read(FileDescription& 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->read(fd, offset + adjust, outbuf, len);
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}
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bool DiskPartition::can_read(const FileDescription& 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->can_read(fd, offset + adjust);
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}
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KResultOr<size_t> DiskPartition::write(FileDescription& 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->write(fd, offset + adjust, inbuf, len);
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}
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bool DiskPartition::can_write(const FileDescription& 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->can_write(fd, offset + adjust);
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}
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String DiskPartition::device_name() const
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{
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// FIXME: Try to not hardcode a maximum of 16 partitions per drive!
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size_t partition_index = minor() % 16;
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return String::formatted("{}{}", m_device->device_name(), partition_index + 1);
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}
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const char* 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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