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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <Kernel/Debug.h>
#include <Kernel/FileSystem/FileDescription.h>
#include <Kernel/Storage/Partition/DiskPartition.h>
namespace Kernel {
NonnullRefPtr<DiskPartition> DiskPartition::create(BlockDevice& device, unsigned minor_number, DiskPartitionMetadata metadata)
{
return adopt(*new DiskPartition(device, minor_number, metadata));
}
DiskPartition::DiskPartition(BlockDevice& device, unsigned minor_number, DiskPartitionMetadata metadata)
: BlockDevice(100, minor_number, device.block_size())
, m_device(device)
, m_metadata(metadata)
{
}
DiskPartition::~DiskPartition()
{
}
const DiskPartitionMetadata& DiskPartition::metadata() const
{
return m_metadata;
}
void DiskPartition::start_request(AsyncBlockDeviceRequest& request)
{
request.add_sub_request(m_device->make_request<AsyncBlockDeviceRequest>(request.request_type(),
request.block_index() + m_metadata.start_block(), request.block_count(), request.buffer(), request.buffer_size()));
}
KResultOr<size_t> DiskPartition::read(FileDescription& fd, u64 offset, UserOrKernelBuffer& outbuf, size_t len)
{
unsigned adjust = m_metadata.start_block() * block_size();
dbgln_if(OFFD_DEBUG, "DiskPartition::read offset={}, adjust={}, len={}", fd.offset(), adjust, len);
return m_device->read(fd, offset + adjust, outbuf, len);
}
bool DiskPartition::can_read(const FileDescription& fd, size_t offset) const
{
unsigned adjust = m_metadata.start_block() * block_size();
dbgln_if(OFFD_DEBUG, "DiskPartition::can_read offset={}, adjust={}", offset, adjust);
return m_device->can_read(fd, offset + adjust);
}
KResultOr<size_t> DiskPartition::write(FileDescription& fd, u64 offset, const UserOrKernelBuffer& inbuf, size_t len)
{
unsigned adjust = m_metadata.start_block() * block_size();
dbgln_if(OFFD_DEBUG, "DiskPartition::write offset={}, adjust={}, len={}", offset, adjust, len);
return m_device->write(fd, offset + adjust, inbuf, len);
}
bool DiskPartition::can_write(const FileDescription& fd, size_t offset) const
{
unsigned adjust = m_metadata.start_block() * block_size();
dbgln_if(OFFD_DEBUG, "DiskPartition::can_write offset={}, adjust={}", offset, adjust);
return m_device->can_write(fd, offset + adjust);
}
String DiskPartition::device_name() const
{
// FIXME: Try to not hardcode a maximum of 16 partitions per drive!
size_t partition_index = minor() % 16;
return String::formatted("{}{}", m_device->device_name(), partition_index + 1);
}
const char* DiskPartition::class_name() const
{
return "DiskPartition";
}
}
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