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Revert "Kernel/Storage: Remove the ramdisk implementation"

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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/*
* Copyright (c) 2021, the SerenityOS developers.
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/OwnPtr.h>
#include <AK/Types.h>
#include <Kernel/Library/LockRefPtr.h>
#include <Kernel/Storage/Ramdisk/Controller.h>
namespace Kernel {
NonnullLockRefPtr<RamdiskController> RamdiskController::initialize()
{
return adopt_lock_ref(*new RamdiskController());
}
bool RamdiskController::reset()
{
TODO();
}
bool RamdiskController::shutdown()
{
TODO();
}
size_t RamdiskController::devices_count() const
{
return m_devices.size();
}
void RamdiskController::complete_current_request(AsyncDeviceRequest::RequestResult)
{
VERIFY_NOT_REACHED();
}
RamdiskController::RamdiskController()
: StorageController(0)
{
// Populate ramdisk controllers from Multiboot boot modules, if any.
size_t count = 0;
MM.for_each_used_memory_range([&](auto& used_memory_range) {
if (used_memory_range.type == Memory::UsedMemoryRangeType::BootModule) {
size_t length = Memory::page_round_up(used_memory_range.end.get()).release_value_but_fixme_should_propagate_errors() - used_memory_range.start.get();
auto region_or_error = MM.allocate_kernel_region(used_memory_range.start, length, "Ramdisk"sv, Memory::Region::Access::ReadWrite);
if (region_or_error.is_error()) {
dmesgln("RamdiskController: Failed to allocate kernel region of size {}", length);
} else {
m_devices.append(RamdiskDevice::create(*this, region_or_error.release_value(), 6, count));
}
count++;
}
});
}
RamdiskController::~RamdiskController() = default;
LockRefPtr<StorageDevice> RamdiskController::device(u32 index) const
{
if (index >= m_devices.size())
return nullptr;
return m_devices[index];
}
}

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/*
* Copyright (c) 2021, the SerenityOS developers.
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/OwnPtr.h>
#include <AK/Types.h>
#include <Kernel/Library/LockRefPtr.h>
#include <Kernel/Storage/Ramdisk/Device.h>
#include <Kernel/Storage/StorageController.h>
#include <Kernel/Storage/StorageDevice.h>
namespace Kernel {
class AsyncBlockDeviceRequest;
class RamdiskController final : public StorageController {
public:
static NonnullLockRefPtr<RamdiskController> initialize();
virtual ~RamdiskController() override;
virtual LockRefPtr<StorageDevice> device(u32 index) const override;
virtual bool reset() override;
virtual bool shutdown() override;
virtual size_t devices_count() const override;
virtual void complete_current_request(AsyncDeviceRequest::RequestResult) override;
private:
RamdiskController();
NonnullLockRefPtrVector<RamdiskDevice> m_devices;
};
}

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/*
* 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);
}
}
}

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/*
* Copyright (c) 2021, the SerenityOS developers.
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <Kernel/Locking/Mutex.h>
#include <Kernel/Storage/StorageDevice.h>
namespace Kernel {
class RamdiskController;
class RamdiskDevice final : public StorageDevice {
friend class RamdiskController;
friend class DeviceManagement;
public:
static NonnullLockRefPtr<RamdiskDevice> create(RamdiskController const&, NonnullOwnPtr<Memory::Region>&& region, int major, int minor);
virtual ~RamdiskDevice() override;
// ^DiskDevice
virtual StringView class_name() const override;
private:
RamdiskDevice(RamdiskController const&, NonnullOwnPtr<Memory::Region>&&, int major, int minor);
// ^BlockDevice
virtual void start_request(AsyncBlockDeviceRequest&) override;
// ^StorageDevice
virtual CommandSet command_set() const override { return CommandSet::PlainMemory; }
Mutex m_lock { "RamdiskDevice"sv };
NonnullOwnPtr<Memory::Region> m_region;
};
}