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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <Kernel/Devices/BlockDevice.h>
namespace Kernel {
AsyncBlockDeviceRequest::AsyncBlockDeviceRequest(Device& block_device, RequestType request_type, u64 block_index, u32 block_count, UserOrKernelBuffer const& buffer, size_t buffer_size)
: AsyncDeviceRequest(block_device)
, m_block_device(static_cast<BlockDevice&>(block_device))
, m_request_type(request_type)
, m_block_index(block_index)
, m_block_count(block_count)
, m_buffer(buffer)
, m_buffer_size(buffer_size)
{
}
void AsyncBlockDeviceRequest::start()
{
m_block_device.start_request(*this);
}
BlockDevice::~BlockDevice() = default;
bool BlockDevice::read_block(u64 index, UserOrKernelBuffer& buffer)
{
auto read_request_or_error = try_make_request<AsyncBlockDeviceRequest>(AsyncBlockDeviceRequest::Read, index, 1, buffer, m_block_size);
if (read_request_or_error.is_error()) {
dbgln("BlockDevice::read_block({}): try_make_request failed", index);
return false;
}
auto read_request = read_request_or_error.release_value();
switch (read_request->wait().request_result()) {
case AsyncDeviceRequest::Success:
return true;
case AsyncDeviceRequest::Failure:
dbgln("BlockDevice::read_block({}) IO error", index);
break;
case AsyncDeviceRequest::MemoryFault:
dbgln("BlockDevice::read_block({}) EFAULT", index);
break;
case AsyncDeviceRequest::Cancelled:
dbgln("BlockDevice::read_block({}) cancelled", index);
break;
default:
VERIFY_NOT_REACHED();
}
return false;
}
bool BlockDevice::write_block(u64 index, UserOrKernelBuffer const& buffer)
{
auto write_request_or_error = try_make_request<AsyncBlockDeviceRequest>(AsyncBlockDeviceRequest::Write, index, 1, buffer, m_block_size);
if (write_request_or_error.is_error()) {
dbgln("BlockDevice::write_block({}): try_make_request failed", index);
return false;
}
auto write_request = write_request_or_error.release_value();
switch (write_request->wait().request_result()) {
case AsyncDeviceRequest::Success:
return true;
case AsyncDeviceRequest::Failure:
dbgln("BlockDevice::write_block({}) IO error", index);
break;
case AsyncDeviceRequest::MemoryFault:
dbgln("BlockDevice::write_block({}) EFAULT", index);
break;
case AsyncDeviceRequest::Cancelled:
dbgln("BlockDevice::write_block({}) cancelled", index);
break;
default:
VERIFY_NOT_REACHED();
}
return false;
}
}
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