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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <Kernel/Devices/DiskPartition.h>
#include <Kernel/FileSystem/FileDescription.h>
// #define OFFD_DEBUG
namespace Kernel {
NonnullRefPtr<DiskPartition> DiskPartition::create(BlockDevice& device, unsigned block_offset, unsigned block_limit)
{
return adopt(*new DiskPartition(device, block_offset, block_limit));
}
DiskPartition::DiskPartition(BlockDevice& device, unsigned block_offset, unsigned block_limit)
: BlockDevice(100, 0, device.block_size())
, m_device(device)
, m_block_offset(block_offset)
, m_block_limit(block_limit)
{
}
DiskPartition::~DiskPartition()
{
}
void DiskPartition::start_request(AsyncBlockDeviceRequest& request)
{
request.add_sub_request(m_device->make_request<AsyncBlockDeviceRequest>(request.request_type(),
request.block_index() + m_block_offset, request.block_count(), request.buffer(), request.buffer_size()));
}
KResultOr<size_t> DiskPartition::read(FileDescription& fd, size_t offset, UserOrKernelBuffer& outbuf, size_t len)
{
unsigned adjust = m_block_offset * block_size();
#ifdef OFFD_DEBUG
klog() << "DiskPartition::read offset=" << fd.offset() << " adjust=" << adjust << " len=" << len;
#endif
return m_device->read(fd, offset + adjust, outbuf, len);
}
bool DiskPartition::can_read(const FileDescription& fd, size_t offset) const
{
unsigned adjust = m_block_offset * block_size();
#ifdef OFFD_DEBUG
klog() << "DiskPartition::can_read offset=" << offset << " adjust=" << adjust;
#endif
return m_device->can_read(fd, offset + adjust);
}
KResultOr<size_t> DiskPartition::write(FileDescription& fd, size_t offset, const UserOrKernelBuffer& inbuf, size_t len)
{
unsigned adjust = m_block_offset * block_size();
#ifdef OFFD_DEBUG
klog() << "DiskPartition::write offset=" << offset << " adjust=" << adjust << " len=" << len;
#endif
return m_device->write(fd, offset + adjust, inbuf, len);
}
bool DiskPartition::can_write(const FileDescription& fd, size_t offset) const
{
unsigned adjust = m_block_offset * block_size();
#ifdef OFFD_DEBUG
klog() << "DiskPartition::can_write offset=" << offset << " adjust=" << adjust;
#endif
return m_device->can_write(fd, offset + adjust);
}
const char* DiskPartition::class_name() const
{
return "DiskPartition";
}
}
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