1dbd32488f
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.
76 lines
2.4 KiB
C++
76 lines
2.4 KiB
C++
/*
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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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