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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Singleton.h>
#include <Kernel/Devices/Device.h>
#include <Kernel/Devices/DeviceManagement.h>
#include <Kernel/FileSystem/InodeMetadata.h>
#include <Kernel/FileSystem/SysFS/Component.h>
#include <Kernel/FileSystem/SysFS/Subsystems/DeviceIdentifiers/BlockDevicesDirectory.h>
#include <Kernel/FileSystem/SysFS/Subsystems/DeviceIdentifiers/CharacterDevicesDirectory.h>
#include <Kernel/Sections.h>
namespace Kernel {
Device::Device(MajorNumber major, MinorNumber minor)
: m_major(major)
, m_minor(minor)
{
}
void Device::before_will_be_destroyed_remove_from_device_management()
{
DeviceManagement::the().before_device_removal({}, *this);
m_state = State::BeingRemoved;
}
void Device::after_inserting_add_to_device_management()
{
DeviceManagement::the().after_inserting_device({}, *this);
}
void Device::after_inserting()
{
after_inserting_add_to_device_management();
VERIFY(!m_sysfs_component);
auto sys_fs_component = SysFSDeviceComponent::must_create(*this);
m_sysfs_component = sys_fs_component;
after_inserting_add_to_device_identifier_directory();
}
void Device::will_be_destroyed()
{
VERIFY(m_sysfs_component);
before_will_be_destroyed_remove_from_device_identifier_directory();
before_will_be_destroyed_remove_from_device_management();
}
Device::~Device()
{
VERIFY(m_state == State::BeingRemoved);
}
ErrorOr<NonnullOwnPtr<KString>> Device::pseudo_path(OpenFileDescription const&) const
{
return KString::formatted("device:{},{}", major(), minor());
}
ErrorOr<NonnullLockRefPtr<OpenFileDescription>> Device::open(int options)
{
TRY(Process::current().jail().with([&](auto& my_jail) -> ErrorOr<void> {
if (my_jail && !is_openable_by_jailed_processes())
return Error::from_errno(EPERM);
return {};
}));
return File::open(options);
}
void Device::process_next_queued_request(Badge<AsyncDeviceRequest>, AsyncDeviceRequest const& completed_request)
{
SpinlockLocker lock(m_requests_lock);
VERIFY(!m_requests.is_empty());
VERIFY(m_requests.first().ptr() == &completed_request);
m_requests.remove(m_requests.begin());
if (!m_requests.is_empty()) {
auto* next_request = m_requests.first().ptr();
next_request->do_start(move(lock));
}
evaluate_block_conditions();
}
}
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