mirror of
https://github.com/SerenityOS/serenity
synced 2024-09-06 17:06:31 +00:00
ef766b0b5f
It can be possible for a request to be blocked on another request, so this patch allows us to send more requests even when a request is already pending.
54 lines
1.7 KiB
C++
54 lines
1.7 KiB
C++
/*
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* Copyright (c) 2024, 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/HashMap.h>
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#include <Kernel/Devices/CharacterDevice.h>
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#include <Kernel/Locking/Mutex.h>
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#include <Kernel/Locking/SpinlockProtected.h>
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namespace Kernel {
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struct FUSEInstance {
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OpenFileDescription const* fd = nullptr;
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NonnullOwnPtr<KBuffer> pending_request;
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NonnullOwnPtr<KBuffer> response;
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bool buffer_ready = false;
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bool response_ready = false;
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bool expecting_header = true;
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};
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class FUSEDevice final : public CharacterDevice {
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friend class DeviceManagement;
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public:
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static NonnullLockRefPtr<FUSEDevice> must_create();
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virtual ~FUSEDevice() override;
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ErrorOr<void> initialize_instance(OpenFileDescription const&);
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ErrorOr<NonnullOwnPtr<KBuffer>> send_request_and_wait_for_a_reply(OpenFileDescription const&, Bytes);
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void shutdown_for_description(OpenFileDescription const&);
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private:
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FUSEDevice();
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// ^Device
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virtual bool is_openable_by_jailed_processes() const override { return false; }
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// ^CharacterDevice
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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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virtual bool can_read(OpenFileDescription const&, u64) const override;
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virtual bool can_write(OpenFileDescription const&, u64) const override;
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virtual StringView class_name() const override { return "FUSEDevice"sv; }
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SpinlockProtected<HashMap<OpenFileDescription const*, Vector<FUSEInstance>>, LockRank::None> m_instances;
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SpinlockProtected<Vector<OpenFileDescription const*>, LockRank::None> m_closing_instances;
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};
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}
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