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b02ee664e7
To do this we also need to get rid of LockRefPtrs in the USB code as well. Most of the SysFS nodes are statically generated during boot and are not mutated afterwards. The same goes for general device code - once we generate the appropriate SysFS nodes, we almost never mutate the node pointers afterwards, making locking unnecessary.
105 lines
3.6 KiB
C++
105 lines
3.6 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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// Device is the base class of everything that lives in the /dev directory.
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//
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// To expose a Device to the filesystem, simply pass two unique numbers to the constructor,
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// and then mknod a file in /dev with those numbers.
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//
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// There are two main subclasses:
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// - BlockDevice (random access)
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// - CharacterDevice (sequential)
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#include <AK/DoublyLinkedList.h>
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#include <AK/Error.h>
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#include <AK/Function.h>
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#include <AK/HashMap.h>
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#include <Kernel/Devices/AsyncDeviceRequest.h>
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#include <Kernel/FileSystem/DeviceFileTypes.h>
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#include <Kernel/FileSystem/File.h>
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#include <Kernel/FileSystem/SysFS/Registry.h>
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#include <Kernel/FileSystem/SysFS/Subsystems/DeviceIdentifiers/DeviceComponent.h>
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#include <Kernel/FileSystem/SysFS/Subsystems/DeviceIdentifiers/SymbolicLinkDeviceComponent.h>
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#include <Kernel/Library/LockRefPtr.h>
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#include <Kernel/UnixTypes.h>
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namespace Kernel {
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class Device : public File {
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protected:
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enum class State {
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Normal,
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BeingRemoved,
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};
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public:
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virtual ~Device() override;
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MajorNumber major() const { return m_major; }
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MinorNumber minor() const { return m_minor; }
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virtual ErrorOr<NonnullOwnPtr<KString>> pseudo_path(OpenFileDescription const&) const override;
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virtual ErrorOr<NonnullRefPtr<OpenFileDescription>> open(int options) override;
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UserID uid() const { return m_uid; }
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GroupID gid() const { return m_gid; }
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virtual bool is_device() const override { return true; }
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virtual void will_be_destroyed() override;
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virtual ErrorOr<void> after_inserting();
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virtual bool is_openable_by_jailed_processes() const { return false; }
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void process_next_queued_request(Badge<AsyncDeviceRequest>, AsyncDeviceRequest const&);
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template<typename AsyncRequestType, typename... Args>
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ErrorOr<NonnullLockRefPtr<AsyncRequestType>> try_make_request(Args&&... args)
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{
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auto request = TRY(adopt_nonnull_lock_ref_or_enomem(new (nothrow) AsyncRequestType(*this, forward<Args>(args)...)));
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SpinlockLocker lock(m_requests_lock);
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bool was_empty = m_requests.is_empty();
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TRY(m_requests.try_append(request));
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if (was_empty)
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request->do_start(move(lock));
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return request;
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}
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protected:
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Device(MajorNumber major, MinorNumber minor);
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void set_uid(UserID uid) { m_uid = uid; }
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void set_gid(GroupID gid) { m_gid = gid; }
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void after_inserting_add_to_device_management();
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void before_will_be_destroyed_remove_from_device_management();
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virtual void after_inserting_add_symlink_to_device_identifier_directory() = 0;
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virtual void before_will_be_destroyed_remove_symlink_from_device_identifier_directory() = 0;
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// FIXME: These methods will be eventually removed after all nodes in /sys/dev/block/ and
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// /sys/dev/char/ are symlinks.
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virtual void after_inserting_add_to_device_identifier_directory() = 0;
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virtual void before_will_be_destroyed_remove_from_device_identifier_directory() = 0;
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private:
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MajorNumber const m_major { 0 };
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MinorNumber const m_minor { 0 };
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UserID m_uid { 0 };
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GroupID m_gid { 0 };
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State m_state { State::Normal };
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Spinlock<LockRank::None> m_requests_lock {};
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DoublyLinkedList<LockRefPtr<AsyncDeviceRequest>> m_requests;
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protected:
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// FIXME: This pointer will be eventually removed after all nodes in /sys/dev/block/ and
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// /sys/dev/char/ are symlinks.
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RefPtr<SysFSDeviceComponent> m_sysfs_component;
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RefPtr<SysFSSymbolicLinkDeviceComponent> m_symlink_sysfs_component;
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RefPtr<SysFSDirectory> m_sysfs_device_directory;
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};
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}
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