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https://github.com/RGBCube/serenity
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aee4786d8e
This singleton simplifies many aspects that we struggled with before: 1. There's no need to make derived classes of Device expose the constructor as public anymore. The singleton is a friend of them, so he can call the constructor. This solves the issue with try_create_device helper neatly, hopefully for good. 2. Getting a reference of the NullDevice is now being done from this singleton, which means that NullDevice no longer needs to use its own singleton, and we can apply the try_create_device helper on it too :) 3. We can now defer registration completely after the Device constructor which means the Device constructor is merely assigning the major and minor numbers of the Device, and the try_create_device helper ensures it calls the after_inserting method immediately after construction. This creates a great opportunity to make registration more OOM-safe.
39 lines
992 B
C++
39 lines
992 B
C++
/*
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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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AK_MAKE_ETERNAL
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public:
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static NonnullRefPtr<RamdiskDevice> create(const RamdiskController&, NonnullOwnPtr<Memory::Region>&& region, int major, int minor);
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RamdiskDevice(const RamdiskController&, NonnullOwnPtr<Memory::Region>&&, int major, int minor);
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virtual ~RamdiskDevice() override;
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// ^BlockDevice
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virtual void start_request(AsyncBlockDeviceRequest&) override;
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// ^DiskDevice
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virtual StringView class_name() const override;
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virtual String storage_name() const override;
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bool is_slave() const;
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Mutex m_lock { "RamdiskDevice" };
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NonnullOwnPtr<Memory::Region> m_region;
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};
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}
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