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c216e7439f
Allowing creation of StorageDevicePartition objects for any arbitrary BlockDevice objects means that we could technically create a StorageDevicePartition for another StorageDevicePartition which is obviously not the intention for this code. Instead, require to pass a StorageDevice reference to ensure this cannot happen.
46 lines
1.5 KiB
C++
46 lines
1.5 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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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/Devices/BlockDevice.h>
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#include <Kernel/Library/LockRefPtr.h>
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#include <Kernel/Library/LockWeakPtr.h>
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#include <LibPartition/DiskPartitionMetadata.h>
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namespace Kernel {
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class StorageDevice;
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class StorageDevicePartition final : public BlockDevice {
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friend class DeviceManagement;
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public:
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static NonnullLockRefPtr<StorageDevicePartition> create(StorageDevice&, MinorNumber, Partition::DiskPartitionMetadata);
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virtual ~StorageDevicePartition();
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virtual void start_request(AsyncBlockDeviceRequest&) override;
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// ^BlockDevice
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virtual ErrorOr<size_t> read(OpenFileDescription&, u64, UserOrKernelBuffer&, size_t) override;
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virtual ErrorOr<size_t> write(OpenFileDescription&, u64, UserOrKernelBuffer const&, size_t) override;
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// NOTE: Technically we need to query the underlying StorageDevice,
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// but since it will always return true in both of these methods,
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// we can return true here too.
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virtual bool can_read(OpenFileDescription const&, u64) const override { return true; }
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virtual bool can_write(OpenFileDescription const&, u64) const override { return true; }
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Partition::DiskPartitionMetadata const& metadata() const;
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private:
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StorageDevicePartition(StorageDevice&, MinorNumber, Partition::DiskPartitionMetadata);
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virtual StringView class_name() const override;
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LockWeakPtr<StorageDevice> m_device;
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Partition::DiskPartitionMetadata m_metadata;
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};
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}
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