mirror of
https://github.com/RGBCube/serenity
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f64e287b82
Besides removing the monolithic DevFSDeviceInode::determine_name() method, being able to determine a device's name inside the /dev hierarchy outside of DevFS has its uses.
117 lines
4 KiB
C++
117 lines
4 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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#include <Kernel/FileSystem/FileDescription.h>
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#include <Kernel/Storage/Partition/DiskPartition.h>
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// #define OFFD_DEBUG
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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(*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, size_t 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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#ifdef OFFD_DEBUG
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klog() << "DiskPartition::read offset=" << fd.offset() << " adjust=" << adjust << " len=" << len;
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#endif
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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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#ifdef OFFD_DEBUG
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klog() << "DiskPartition::can_read offset=" << offset << " adjust=" << adjust;
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#endif
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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, size_t 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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#ifdef OFFD_DEBUG
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klog() << "DiskPartition::write offset=" << offset << " adjust=" << adjust << " len=" << len;
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#endif
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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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#ifdef OFFD_DEBUG
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klog() << "DiskPartition::can_write offset=" << offset << " adjust=" << adjust;
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#endif
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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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