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Revert "Kernel/Storage: Remove the ramdisk implementation"

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This reverts commit 4e0f85432a as the
ramdisk code is useful for the bring-up of the aarch64 port. Once the
kernel supports better ram-based filesystems, this code will be removed
again.
This commit is contained in:
Timon Kruiper 2023-01-30 13:48:44 +01:00 • committed by Linus Groh
parent 4d68dcfca0
commit 187723776a
9 changed files with 227 additions and 0 deletions
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60
Kernel/Storage/Ramdisk/Device.cpp Normal file
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@ -0,0 +1,60 @@
/*
* Copyright (c) 2021, the SerenityOS developers.
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Memory.h>
#include <AK/StringView.h>
#include <Kernel/Devices/DeviceManagement.h>
#include <Kernel/FileSystem/OpenFileDescription.h>
#include <Kernel/Storage/Ramdisk/Controller.h>
#include <Kernel/Storage/Ramdisk/Device.h>
namespace Kernel {
NonnullLockRefPtr<RamdiskDevice> RamdiskDevice::create(RamdiskController const& controller, NonnullOwnPtr<Memory::Region>&& region, int major, int minor)
{
auto device_or_error = DeviceManagement::try_create_device<RamdiskDevice>(controller, move(region), major, minor);
// FIXME: Find a way to propagate errors
VERIFY(!device_or_error.is_error());
return device_or_error.release_value();
}
RamdiskDevice::RamdiskDevice(RamdiskController const& controller, NonnullOwnPtr<Memory::Region>&& region, int major, int minor)
: StorageDevice({}, LUNAddress { controller.controller_id(), 0, 0 }, 0, major, minor, 512, region->size() / 512)
, m_region(move(region))
{
dmesgln("Ramdisk: Device #{} @ {}, Capacity={}", minor, m_region->vaddr(), max_addressable_block() * 512);
}
RamdiskDevice::~RamdiskDevice() = default;
StringView RamdiskDevice::class_name() const
{
return "RamdiskDevice"sv;
}
void RamdiskDevice::start_request(AsyncBlockDeviceRequest& request)
{
MutexLocker locker(m_lock);
u8* base = m_region->vaddr().as_ptr();
size_t size = m_region->size();
u8* offset = base + request.block_index() * request.block_size();
size_t length = request.buffer_size();
if ((offset + length > base + size) || (offset + length < base)) {
request.complete(AsyncDeviceRequest::Failure);
} else {
ErrorOr<void> result;
if (request.request_type() == AsyncBlockDeviceRequest::Read) {
result = request.buffer().write(offset, length);
} else {
result = request.buffer().read(offset, length);
}
request.complete(!result.is_error() ? AsyncDeviceRequest::Success : AsyncDeviceRequest::MemoryFault);
}
}
}