mirror of
https://github.com/SerenityOS/serenity
synced 2024-10-15 20:33:10 +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++
/*
|
|
* Copyright (c) 2024, the SerenityOS developers.
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <AK/HashMap.h>
|
|
#include <Kernel/Devices/CharacterDevice.h>
|
|
#include <Kernel/Locking/Mutex.h>
|
|
#include <Kernel/Locking/SpinlockProtected.h>
|
|
|
|
namespace Kernel {
|
|
|
|
struct FUSEInstance {
|
|
OpenFileDescription const* fd = nullptr;
|
|
NonnullOwnPtr<KBuffer> pending_request;
|
|
NonnullOwnPtr<KBuffer> response;
|
|
bool buffer_ready = false;
|
|
bool response_ready = false;
|
|
bool expecting_header = true;
|
|
};
|
|
|
|
class FUSEDevice final : public CharacterDevice {
|
|
friend class DeviceManagement;
|
|
|
|
public:
|
|
static NonnullLockRefPtr<FUSEDevice> must_create();
|
|
virtual ~FUSEDevice() override;
|
|
|
|
ErrorOr<void> initialize_instance(OpenFileDescription const&);
|
|
ErrorOr<NonnullOwnPtr<KBuffer>> send_request_and_wait_for_a_reply(OpenFileDescription const&, Bytes);
|
|
void shutdown_for_description(OpenFileDescription const&);
|
|
|
|
private:
|
|
FUSEDevice();
|
|
|
|
// ^Device
|
|
virtual bool is_openable_by_jailed_processes() const override { return false; }
|
|
|
|
// ^CharacterDevice
|
|
virtual ErrorOr<size_t> read(OpenFileDescription&, u64, UserOrKernelBuffer&, size_t) override;
|
|
virtual ErrorOr<size_t> write(OpenFileDescription&, u64, UserOrKernelBuffer const&, size_t) override;
|
|
virtual bool can_read(OpenFileDescription const&, u64) const override;
|
|
virtual bool can_write(OpenFileDescription const&, u64) const override;
|
|
virtual StringView class_name() const override { return "FUSEDevice"sv; }
|
|
|
|
SpinlockProtected<HashMap<OpenFileDescription const*, Vector<FUSEInstance>>, LockRank::None> m_instances;
|
|
SpinlockProtected<Vector<OpenFileDescription const*>, LockRank::None> m_closing_instances;
|
|
};
|
|
|
|
}
|