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Kernel/SysFS: Add /sys/devices/storage directory

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This change in fact does the following:
1. Use support for symlinks between /sys/dev/block/ storage device
identifier nodes and devices in /sys/devices/storage/{LUN}.
2. Add basic nodes in a /sys/devices/storage/{LUN} directory, to let
userspace to know about the device and its details.
This commit is contained in:
Liav A 2022-04-23 11:48:40 +03:00 • committed by Andreas Kling
parent 22335e53e0
commit 1dbd32488f
19 changed files with 450 additions and 1 deletions
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32
Kernel/Storage/StorageDevice.cpp
View file

@ -7,7 +7,12 @@
#include <AK/Memory.h>
#include <AK/StringView.h>
#include <Kernel/Debug.h>
#include <Kernel/Devices/DeviceManagement.h>
#include <Kernel/FileSystem/OpenFileDescription.h>
#include <Kernel/FileSystem/SysFS/Subsystems/DeviceIdentifiers/BlockDevicesDirectory.h>
#include <Kernel/FileSystem/SysFS/Subsystems/DeviceIdentifiers/SymbolicLinkDeviceComponent.h>
#include <Kernel/FileSystem/SysFS/Subsystems/Devices/Storage/DeviceDirectory.h>
#include <Kernel/FileSystem/SysFS/Subsystems/Devices/Storage/Directory.h>
#include <Kernel/Storage/StorageDevice.h>
#include <Kernel/Storage/StorageManagement.h>
#include <LibC/sys/ioctl_numbers.h>
@ -23,6 +28,33 @@ StorageDevice::StorageDevice(LUNAddress logical_unit_number_address, MajorNumber
{
}
void StorageDevice::after_inserting()
{
after_inserting_add_to_device_management();
auto sysfs_storage_device_directory = StorageDeviceSysFSDirectory::create(SysFSStorageDirectory::the(), *this);
m_sysfs_device_directory = sysfs_storage_device_directory;
SysFSStorageDirectory::the().plug({}, *sysfs_storage_device_directory);
VERIFY(!m_symlink_sysfs_component);
auto sys_fs_component = MUST(SysFSSymbolicLinkDeviceComponent::try_create(SysFSDeviceIdentifiersDirectory::the(), *this, *m_sysfs_device_directory));
m_symlink_sysfs_component = sys_fs_component;
VERIFY(is_block_device());
SysFSBlockDevicesDirectory::the().m_child_components.with([&](auto& list) -> void {
list.append(sys_fs_component);
});
}
void StorageDevice::will_be_destroyed()
{
VERIFY(m_symlink_sysfs_component);
VERIFY(is_block_device());
SysFSBlockDevicesDirectory::the().m_child_components.with([&](auto& list) -> void {
list.remove(*m_symlink_sysfs_component);
});
m_symlink_sysfs_component.clear();
SysFSStorageDirectory::the().unplug({}, *m_sysfs_device_directory);
before_will_be_destroyed_remove_from_device_management();
}
StringView StorageDevice::class_name() const
{
return "StorageDevice"sv;

4
Kernel/Storage/StorageDevice.h
View file

@ -17,6 +17,7 @@ namespace Kernel {
class StorageDevice : public BlockDevice {
friend class StorageManagement;
friend class DeviceManagement;
public:
// Note: this attribute describes the internal command set of a Storage device.
@ -92,6 +93,9 @@ protected:
virtual StringView class_name() const override;
private:
virtual void after_inserting() override;
virtual void will_be_destroyed() override;
virtual InterfaceType interface_type() const = 0;
mutable IntrusiveListNode<StorageDevice, RefPtr<StorageDevice>> m_list_node;
NonnullRefPtrVector<DiskPartition> m_partitions;