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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:
parent
4d68dcfca0
commit
187723776a
9 changed files with 227 additions and 0 deletions
67
Kernel/Storage/Ramdisk/Controller.cpp
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67
Kernel/Storage/Ramdisk/Controller.cpp
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/*
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* Copyright (c) 2021, the SerenityOS developers.
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/OwnPtr.h>
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#include <AK/Types.h>
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#include <Kernel/Library/LockRefPtr.h>
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#include <Kernel/Storage/Ramdisk/Controller.h>
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namespace Kernel {
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NonnullLockRefPtr<RamdiskController> RamdiskController::initialize()
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{
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return adopt_lock_ref(*new RamdiskController());
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}
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bool RamdiskController::reset()
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{
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TODO();
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}
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bool RamdiskController::shutdown()
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{
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TODO();
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}
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size_t RamdiskController::devices_count() const
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{
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return m_devices.size();
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}
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void RamdiskController::complete_current_request(AsyncDeviceRequest::RequestResult)
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{
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VERIFY_NOT_REACHED();
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}
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RamdiskController::RamdiskController()
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: StorageController(0)
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{
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// Populate ramdisk controllers from Multiboot boot modules, if any.
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size_t count = 0;
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MM.for_each_used_memory_range([&](auto& used_memory_range) {
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if (used_memory_range.type == Memory::UsedMemoryRangeType::BootModule) {
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size_t length = Memory::page_round_up(used_memory_range.end.get()).release_value_but_fixme_should_propagate_errors() - used_memory_range.start.get();
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auto region_or_error = MM.allocate_kernel_region(used_memory_range.start, length, "Ramdisk"sv, Memory::Region::Access::ReadWrite);
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if (region_or_error.is_error()) {
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dmesgln("RamdiskController: Failed to allocate kernel region of size {}", length);
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} else {
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m_devices.append(RamdiskDevice::create(*this, region_or_error.release_value(), 6, count));
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}
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count++;
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}
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});
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}
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RamdiskController::~RamdiskController() = default;
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LockRefPtr<StorageDevice> RamdiskController::device(u32 index) const
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{
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if (index >= m_devices.size())
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return nullptr;
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return m_devices[index];
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}
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}
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36
Kernel/Storage/Ramdisk/Controller.h
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36
Kernel/Storage/Ramdisk/Controller.h
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/*
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* Copyright (c) 2021, the SerenityOS developers.
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/OwnPtr.h>
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#include <AK/Types.h>
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#include <Kernel/Library/LockRefPtr.h>
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#include <Kernel/Storage/Ramdisk/Device.h>
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#include <Kernel/Storage/StorageController.h>
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#include <Kernel/Storage/StorageDevice.h>
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namespace Kernel {
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class AsyncBlockDeviceRequest;
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class RamdiskController final : public StorageController {
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public:
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static NonnullLockRefPtr<RamdiskController> initialize();
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virtual ~RamdiskController() override;
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virtual LockRefPtr<StorageDevice> device(u32 index) const override;
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virtual bool reset() override;
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virtual bool shutdown() override;
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virtual size_t devices_count() const override;
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virtual void complete_current_request(AsyncDeviceRequest::RequestResult) override;
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private:
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RamdiskController();
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NonnullLockRefPtrVector<RamdiskDevice> m_devices;
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};
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}
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60
Kernel/Storage/Ramdisk/Device.cpp
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60
Kernel/Storage/Ramdisk/Device.cpp
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/*
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* Copyright (c) 2021, the SerenityOS developers.
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/Memory.h>
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#include <AK/StringView.h>
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#include <Kernel/Devices/DeviceManagement.h>
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#include <Kernel/FileSystem/OpenFileDescription.h>
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#include <Kernel/Storage/Ramdisk/Controller.h>
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#include <Kernel/Storage/Ramdisk/Device.h>
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namespace Kernel {
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NonnullLockRefPtr<RamdiskDevice> RamdiskDevice::create(RamdiskController const& controller, NonnullOwnPtr<Memory::Region>&& region, int major, int minor)
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{
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auto device_or_error = DeviceManagement::try_create_device<RamdiskDevice>(controller, move(region), major, minor);
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// FIXME: Find a way to propagate errors
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VERIFY(!device_or_error.is_error());
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return device_or_error.release_value();
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}
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RamdiskDevice::RamdiskDevice(RamdiskController const& controller, NonnullOwnPtr<Memory::Region>&& region, int major, int minor)
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: StorageDevice({}, LUNAddress { controller.controller_id(), 0, 0 }, 0, major, minor, 512, region->size() / 512)
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, m_region(move(region))
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{
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dmesgln("Ramdisk: Device #{} @ {}, Capacity={}", minor, m_region->vaddr(), max_addressable_block() * 512);
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}
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RamdiskDevice::~RamdiskDevice() = default;
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StringView RamdiskDevice::class_name() const
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{
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return "RamdiskDevice"sv;
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}
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void RamdiskDevice::start_request(AsyncBlockDeviceRequest& request)
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{
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MutexLocker locker(m_lock);
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u8* base = m_region->vaddr().as_ptr();
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size_t size = m_region->size();
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u8* offset = base + request.block_index() * request.block_size();
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size_t length = request.buffer_size();
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if ((offset + length > base + size) || (offset + length < base)) {
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request.complete(AsyncDeviceRequest::Failure);
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} else {
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ErrorOr<void> result;
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if (request.request_type() == AsyncBlockDeviceRequest::Read) {
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result = request.buffer().write(offset, length);
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} else {
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result = request.buffer().read(offset, length);
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}
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request.complete(!result.is_error() ? AsyncDeviceRequest::Success : AsyncDeviceRequest::MemoryFault);
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}
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}
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}
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41
Kernel/Storage/Ramdisk/Device.h
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41
Kernel/Storage/Ramdisk/Device.h
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/*
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* Copyright (c) 2021, the SerenityOS developers.
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <Kernel/Locking/Mutex.h>
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#include <Kernel/Storage/StorageDevice.h>
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namespace Kernel {
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class RamdiskController;
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class RamdiskDevice final : public StorageDevice {
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friend class RamdiskController;
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friend class DeviceManagement;
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public:
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static NonnullLockRefPtr<RamdiskDevice> create(RamdiskController const&, NonnullOwnPtr<Memory::Region>&& region, int major, int minor);
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virtual ~RamdiskDevice() override;
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// ^DiskDevice
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virtual StringView class_name() const override;
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private:
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RamdiskDevice(RamdiskController const&, NonnullOwnPtr<Memory::Region>&&, int major, int minor);
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// ^BlockDevice
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virtual void start_request(AsyncBlockDeviceRequest&) override;
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// ^StorageDevice
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virtual CommandSet command_set() const override { return CommandSet::PlainMemory; }
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Mutex m_lock { "RamdiskDevice"sv };
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NonnullOwnPtr<Memory::Region> m_region;
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};
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}
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