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https://github.com/RGBCube/serenity
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9dc8bea3e7
Instead of specifying the boot argument to be root=/dev/hdXY, now one can write root=PARTUUID= with the right UUID, and if the partition is found, the kernel will boot from it. This feature is mainly used with GUID partitions, and is considered to be the most reliable way for the kernel to identify partitions.
110 lines
3.7 KiB
C++
110 lines
3.7 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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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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