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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.h>
#include <Kernel/Sections.h>
namespace Kernel {
NonnullRefPtr<SysFSDeviceComponent> SysFSDeviceComponent::must_create(Device const& device)
{
return adopt_ref_if_nonnull(new SysFSDeviceComponent(device)).release_nonnull();
}
SysFSDeviceComponent::SysFSDeviceComponent(Device const& device)
: SysFSComponent(String::formatted("{}:{}", device.major(), device.minor()))
, m_block_device(device.is_block_device())
{
VERIFY(device.is_block_device() || device.is_character_device());
}
UNMAP_AFTER_INIT NonnullRefPtr<SysFSDevicesDirectory> SysFSDevicesDirectory::must_create(SysFSRootDirectory const& root_directory)
{
auto devices_directory = adopt_ref_if_nonnull(new SysFSDevicesDirectory(root_directory)).release_nonnull();
devices_directory->m_components.append(SysFSBlockDevicesDirectory::must_create(*devices_directory));
devices_directory->m_components.append(SysFSCharacterDevicesDirectory::must_create(*devices_directory));
return devices_directory;
}
SysFSDevicesDirectory::SysFSDevicesDirectory(SysFSRootDirectory const& root_directory)
: SysFSDirectory("dev"sv, root_directory)
{
}
NonnullRefPtr<SysFSBlockDevicesDirectory> SysFSBlockDevicesDirectory::must_create(SysFSDevicesDirectory const& devices_directory)
{
return adopt_ref_if_nonnull(new SysFSBlockDevicesDirectory(devices_directory)).release_nonnull();
}
SysFSBlockDevicesDirectory::SysFSBlockDevicesDirectory(SysFSDevicesDirectory const& devices_directory)
: SysFSDirectory("block"sv, devices_directory)
{
}
KResult SysFSBlockDevicesDirectory::traverse_as_directory(unsigned fsid, Function<bool(FileSystem::DirectoryEntryView const&)> callback) const
{
VERIFY(m_parent_directory);
callback({ ".", { fsid, component_index() }, 0 });
callback({ "..", { fsid, m_parent_directory->component_index() }, 0 });
SysFSComponentRegistry::the().devices_list().with_exclusive([&](auto& list) -> void {
for (auto& exposed_device : list) {
if (!exposed_device.is_block_device())
continue;
callback({ exposed_device.name(), { fsid, exposed_device.component_index() }, 0 });
}
});
return KSuccess;
}
RefPtr<SysFSComponent> SysFSBlockDevicesDirectory::lookup(StringView name)
{
return SysFSComponentRegistry::the().devices_list().with_exclusive([&](auto& list) -> RefPtr<SysFSComponent> {
for (auto& exposed_device : list) {
if (!exposed_device.is_block_device())
continue;
if (exposed_device.name() == name)
return exposed_device;
}
return nullptr;
});
}
NonnullRefPtr<SysFSCharacterDevicesDirectory> SysFSCharacterDevicesDirectory::must_create(SysFSDevicesDirectory const& devices_directory)
{
return adopt_ref_if_nonnull(new SysFSCharacterDevicesDirectory(devices_directory)).release_nonnull();
}
SysFSCharacterDevicesDirectory::SysFSCharacterDevicesDirectory(SysFSDevicesDirectory const& devices_directory)
: SysFSDirectory("char"sv, devices_directory)
{
}
KResult SysFSCharacterDevicesDirectory::traverse_as_directory(unsigned fsid, Function<bool(FileSystem::DirectoryEntryView const&)> callback) const
{
VERIFY(m_parent_directory);
callback({ ".", { fsid, component_index() }, 0 });
callback({ "..", { fsid, m_parent_directory->component_index() }, 0 });
SysFSComponentRegistry::the().devices_list().with_exclusive([&](auto& list) -> void {
for (auto& exposed_device : list) {
if (exposed_device.is_block_device())
continue;
callback({ exposed_device.name(), { fsid, exposed_device.component_index() }, 0 });
}
});
return KSuccess;
}
RefPtr<SysFSComponent> SysFSCharacterDevicesDirectory::lookup(StringView name)
{
return SysFSComponentRegistry::the().devices_list().with_exclusive([&](auto& list) -> RefPtr<SysFSComponent> {
for (auto& exposed_device : list) {
if (exposed_device.is_block_device())
continue;
if (exposed_device.name() == name)
return exposed_device;
}
return nullptr;
});
}
Device::Device(unsigned major, unsigned minor)
: m_major(major)
, m_minor(minor)
{
}
void Device::after_inserting()
{
DeviceManagement::the().after_inserting_device({}, *this);
VERIFY(!m_sysfs_component);
auto sys_fs_component = SysFSDeviceComponent::must_create(*this);
m_sysfs_component = sys_fs_component;
SysFSComponentRegistry::the().devices_list().with_exclusive([&](auto& list) -> void {
list.append(sys_fs_component);
});
}
void Device::before_removing()
{
VERIFY(m_sysfs_component);
SysFSComponentRegistry::the().devices_list().with_exclusive([&](auto& list) -> void {
list.remove(*m_sysfs_component);
});
DeviceManagement::the().before_device_removal({}, *this);
m_state = State::BeingRemoved;
}
Device::~Device()
{
VERIFY(m_state == State::BeingRemoved);
}
KResultOr<NonnullOwnPtr<KString>> Device::pseudo_path(const OpenFileDescription&) const
{
return KString::try_create(String::formatted("device:{},{}", major(), minor()));
}
void Device::process_next_queued_request(Badge<AsyncDeviceRequest>, const AsyncDeviceRequest& 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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