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3af70cb0fc
It is starting to get a little messy with how each device can try to add or remove itself to either /sys/dev/block or /sys/dev/char directories. To better do this, we introduce 4 virtual methods to take care of that, so until we ensure all nodes in /sys/dev/block and /sys/dev/char are actual symlinks, we allow the Device base class to call virtual methods upon insertion or before being destroying, so it add itself elegantly to either of these directories or remove itself when needed. For special cases where we need to create symlinks, we have two virtual methods to be called otherwise to do almost the same thing mentioned before, but to use symlinks instead.
75 lines
2.1 KiB
C++
75 lines
2.1 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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#include <AK/Singleton.h>
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#include <Kernel/Devices/Device.h>
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#include <Kernel/Devices/DeviceManagement.h>
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#include <Kernel/FileSystem/InodeMetadata.h>
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#include <Kernel/FileSystem/SysFS.h>
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#include <Kernel/FileSystem/SysFS/Subsystems/DeviceIdentifiers/BlockDevicesDirectory.h>
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#include <Kernel/FileSystem/SysFS/Subsystems/DeviceIdentifiers/CharacterDevicesDirectory.h>
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#include <Kernel/Sections.h>
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namespace Kernel {
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Device::Device(MajorNumber major, MinorNumber minor)
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: m_major(major)
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, m_minor(minor)
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{
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}
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void Device::before_will_be_destroyed_remove_from_device_management()
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{
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DeviceManagement::the().before_device_removal({}, *this);
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m_state = State::BeingRemoved;
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}
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void Device::after_inserting_add_to_device_management()
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{
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DeviceManagement::the().after_inserting_device({}, *this);
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}
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void Device::after_inserting()
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{
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after_inserting_add_to_device_management();
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VERIFY(!m_sysfs_component);
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auto sys_fs_component = SysFSDeviceComponent::must_create(*this);
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m_sysfs_component = sys_fs_component;
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after_inserting_add_to_device_identifier_directory();
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}
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void Device::will_be_destroyed()
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{
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VERIFY(m_sysfs_component);
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before_will_be_destroyed_remove_from_device_identifier_directory();
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before_will_be_destroyed_remove_from_device_management();
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}
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Device::~Device()
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{
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VERIFY(m_state == State::BeingRemoved);
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}
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ErrorOr<NonnullOwnPtr<KString>> Device::pseudo_path(OpenFileDescription const&) const
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{
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return KString::formatted("device:{},{}", major(), minor());
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}
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void Device::process_next_queued_request(Badge<AsyncDeviceRequest>, AsyncDeviceRequest const& completed_request)
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{
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SpinlockLocker lock(m_requests_lock);
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VERIFY(!m_requests.is_empty());
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VERIFY(m_requests.first().ptr() == &completed_request);
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m_requests.remove(m_requests.begin());
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if (!m_requests.is_empty()) {
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auto* next_request = m_requests.first().ptr();
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next_request->do_start(move(lock));
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}
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evaluate_block_conditions();
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}
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}
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