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https://github.com/RGBCube/serenity
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Kernel/SysFS: Add /sys/devices/storage directory
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
Andreas Kling
parent
22335e53e0
commit
1dbd32488f
19 changed files with 450 additions and 1 deletions
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/*
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* Copyright (c) 2022, Liav A. <liavalb@hotmail.co.il>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <Kernel/Bus/PCI/API.h>
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#include <Kernel/Bus/PCI/Access.h>
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#include <Kernel/Debug.h>
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#include <Kernel/FileSystem/SysFS/Subsystems/Devices/Storage/DeviceAttribute.h>
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#include <Kernel/Sections.h>
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namespace Kernel {
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StringView StorageDeviceAttributeSysFSComponent::name() const
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{
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switch (m_type) {
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case Type::EndLBA:
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return "last_lba"sv;
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case Type::SectorSize:
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return "sector_size"sv;
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case Type::CommandSet:
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return "command_set"sv;
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case Type::InterfaceType:
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return "interface_type"sv;
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default:
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VERIFY_NOT_REACHED();
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}
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}
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NonnullRefPtr<StorageDeviceAttributeSysFSComponent> StorageDeviceAttributeSysFSComponent::must_create(StorageDeviceSysFSDirectory const& device_directory, Type type)
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{
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return adopt_ref(*new (nothrow) StorageDeviceAttributeSysFSComponent(device_directory, type));
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}
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StorageDeviceAttributeSysFSComponent::StorageDeviceAttributeSysFSComponent(StorageDeviceSysFSDirectory const& device_directory, Type type)
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: SysFSComponent()
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, m_device(device_directory.device({}))
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, m_type(type)
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{
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}
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ErrorOr<size_t> StorageDeviceAttributeSysFSComponent::read_bytes(off_t offset, size_t count, UserOrKernelBuffer& buffer, OpenFileDescription*) const
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{
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auto blob = TRY(try_to_generate_buffer());
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if ((size_t)offset >= blob->size())
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return 0;
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ssize_t nread = min(static_cast<off_t>(blob->size() - offset), static_cast<off_t>(count));
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TRY(buffer.write(blob->data() + offset, nread));
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return nread;
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}
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ErrorOr<NonnullOwnPtr<KBuffer>> StorageDeviceAttributeSysFSComponent::try_to_generate_buffer() const
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{
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OwnPtr<KString> value;
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switch (m_type) {
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case Type::EndLBA:
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value = TRY(KString::formatted("{}", m_device->max_addressable_block()));
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break;
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case Type::SectorSize:
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value = TRY(KString::formatted("{}", m_device->block_size()));
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break;
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case Type::CommandSet:
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value = TRY(KString::formatted("{}", m_device->command_set_to_string_view()));
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break;
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case Type::InterfaceType:
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value = TRY(KString::formatted("{}", m_device->interface_type_to_string_view()));
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break;
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default:
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VERIFY_NOT_REACHED();
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}
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return KBuffer::try_create_with_bytes("SysFS StorageDeviceAttributeComponent buffer"sv, value->view().bytes());
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}
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}
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/*
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* Copyright (c) 2022, Liav A. <liavalb@hotmail.co.il>
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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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#include <Kernel/FileSystem/SysFS/Component.h>
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#include <Kernel/FileSystem/SysFS/Subsystems/Devices/Storage/DeviceDirectory.h>
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#include <Kernel/KBuffer.h>
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namespace Kernel {
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class StorageDeviceAttributeSysFSComponent : public SysFSComponent {
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public:
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enum class Type {
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EndLBA,
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SectorSize,
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CommandSet,
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InterfaceType,
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};
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public:
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static NonnullRefPtr<StorageDeviceAttributeSysFSComponent> must_create(StorageDeviceSysFSDirectory const& device_directory, Type);
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virtual ErrorOr<size_t> read_bytes(off_t, size_t, UserOrKernelBuffer&, OpenFileDescription*) const override;
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virtual ~StorageDeviceAttributeSysFSComponent() {};
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virtual StringView name() const override;
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protected:
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ErrorOr<NonnullOwnPtr<KBuffer>> try_to_generate_buffer() const;
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StorageDeviceAttributeSysFSComponent(StorageDeviceSysFSDirectory const& device, Type);
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NonnullRefPtr<StorageDevice> m_device;
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Type const m_type { Type::EndLBA };
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};
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}
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/*
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* Copyright (c) 2022, Liav A. <liavalb@hotmail.co.il>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <Kernel/Bus/PCI/API.h>
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#include <Kernel/Bus/PCI/Access.h>
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#include <Kernel/Debug.h>
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#include <Kernel/FileSystem/SysFS/Subsystems/Devices/Storage/DeviceAttribute.h>
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#include <Kernel/FileSystem/SysFS/Subsystems/Devices/Storage/DeviceDirectory.h>
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#include <Kernel/Sections.h>
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#include <Kernel/Storage/StorageDevice.h>
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namespace Kernel {
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StorageDevice const& StorageDeviceSysFSDirectory::device(Badge<StorageDeviceAttributeSysFSComponent>) const
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{
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return *m_device;
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}
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UNMAP_AFTER_INIT NonnullRefPtr<StorageDeviceSysFSDirectory> StorageDeviceSysFSDirectory::create(SysFSDirectory const& parent_directory, StorageDevice const& device)
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{
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// FIXME: Handle allocation failure gracefully
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auto lun_address = device.logical_unit_number_address();
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auto device_name = MUST(KString::formatted("{:02x}:{:02x}.{}", lun_address.controller_id, lun_address.target_id, lun_address.disk_id));
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auto directory = adopt_ref(*new (nothrow) StorageDeviceSysFSDirectory(move(device_name), parent_directory, device));
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MUST(directory->m_child_components.with([&](auto& list) -> ErrorOr<void> {
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list.append(StorageDeviceAttributeSysFSComponent::must_create(*directory, StorageDeviceAttributeSysFSComponent::Type::EndLBA));
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list.append(StorageDeviceAttributeSysFSComponent::must_create(*directory, StorageDeviceAttributeSysFSComponent::Type::SectorSize));
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list.append(StorageDeviceAttributeSysFSComponent::must_create(*directory, StorageDeviceAttributeSysFSComponent::Type::CommandSet));
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list.append(StorageDeviceAttributeSysFSComponent::must_create(*directory, StorageDeviceAttributeSysFSComponent::Type::InterfaceType));
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return {};
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}));
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return directory;
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}
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UNMAP_AFTER_INIT StorageDeviceSysFSDirectory::StorageDeviceSysFSDirectory(NonnullOwnPtr<KString> device_directory_name, SysFSDirectory const& parent_directory, StorageDevice const& device)
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: SysFSDirectory(parent_directory)
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, m_device(device)
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, m_device_directory_name(move(device_directory_name))
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{
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}
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}
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/*
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* Copyright (c) 2022, Liav A. <liavalb@hotmail.co.il>
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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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#include <Kernel/FileSystem/SysFS/Component.h>
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#include <Kernel/KString.h>
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#include <Kernel/Storage/StorageDevice.h>
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namespace Kernel {
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class StorageDeviceAttributeSysFSComponent;
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class StorageDeviceSysFSDirectory final : public SysFSDirectory {
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public:
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static NonnullRefPtr<StorageDeviceSysFSDirectory> create(SysFSDirectory const&, StorageDevice const&);
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virtual StringView name() const override { return m_device_directory_name->view(); }
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StorageDevice const& device(Badge<StorageDeviceAttributeSysFSComponent>) const;
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private:
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StorageDeviceSysFSDirectory(NonnullOwnPtr<KString> device_directory_name, SysFSDirectory const&, StorageDevice const&);
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RefPtr<StorageDevice> m_device;
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NonnullOwnPtr<KString> m_device_directory_name;
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};
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}
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/*
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* Copyright (c) 2022, Liav A. <liavalb@hotmail.co.il>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <Kernel/FileSystem/SysFS/RootDirectory.h>
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#include <Kernel/FileSystem/SysFS/Subsystems/Devices/Directory.h>
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#include <Kernel/FileSystem/SysFS/Subsystems/Devices/Storage/DeviceDirectory.h>
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#include <Kernel/FileSystem/SysFS/Subsystems/Devices/Storage/Directory.h>
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#include <Kernel/Sections.h>
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#include <Kernel/Storage/StorageDevice.h>
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namespace Kernel {
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static SysFSStorageDirectory* s_the { nullptr };
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UNMAP_AFTER_INIT NonnullRefPtr<SysFSStorageDirectory> SysFSStorageDirectory::must_create(SysFSDevicesDirectory const& parent_directory)
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{
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auto directory = adopt_ref(*new (nothrow) SysFSStorageDirectory(parent_directory));
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s_the = directory;
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return directory;
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}
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SysFSStorageDirectory& SysFSStorageDirectory::the()
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{
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VERIFY(s_the);
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return *s_the;
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}
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void SysFSStorageDirectory::plug(Badge<StorageDevice>, StorageDeviceSysFSDirectory& new_device_directory)
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{
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MUST(m_child_components.with([&](auto& list) -> ErrorOr<void> {
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list.append(new_device_directory);
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auto pointed_component_base_name = MUST(KString::try_create(new_device_directory.name()));
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auto pointed_component_relative_path = MUST(new_device_directory.relative_path(move(pointed_component_base_name), 0));
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return {};
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}));
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}
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void SysFSStorageDirectory::unplug(Badge<StorageDevice>, SysFSDirectory& removed_device_directory)
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{
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MUST(m_child_components.with([&](auto& list) -> ErrorOr<void> {
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list.remove(removed_device_directory);
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return {};
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}));
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}
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UNMAP_AFTER_INIT SysFSStorageDirectory::SysFSStorageDirectory(SysFSDevicesDirectory const& parent_directory)
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: SysFSDirectory(parent_directory)
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{
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}
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}
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/*
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* Copyright (c) 2022, Liav A. <liavalb@hotmail.co.il>
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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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#include <Kernel/FileSystem/SysFS/Component.h>
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#include <Kernel/Forward.h>
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namespace Kernel {
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class StorageDeviceSysFSDirectory;
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class StorageDevice;
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class SysFSStorageDirectory : public SysFSDirectory {
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friend class SysFSComponentRegistry;
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public:
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virtual StringView name() const override { return "storage"sv; }
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static SysFSStorageDirectory& the();
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static NonnullRefPtr<SysFSStorageDirectory> must_create(SysFSDevicesDirectory const&);
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void plug(Badge<StorageDevice>, StorageDeviceSysFSDirectory&);
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void unplug(Badge<StorageDevice>, SysFSDirectory&);
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private:
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explicit SysFSStorageDirectory(SysFSDevicesDirectory const&);
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};
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}
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