mirror of
https://github.com/SerenityOS/serenity
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24c1e93afb
After the previous commit, we are able to create a comprehensive list of all devices' major number allocations. To help userspace to distinguish between character and block devices, we expose 2 sysfs nodes so userspace can decide which list it needs to open in order to iterate on it.
55 lines
2.4 KiB
C++
55 lines
2.4 KiB
C++
/*
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* Copyright (c) 2024, 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 <AK/JsonObjectSerializer.h>
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#include <Kernel/API/MajorNumberAllocation.h>
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#include <Kernel/FileSystem/SysFS/Subsystems/Kernel/DeviceMajorNumberAllocations.h>
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namespace Kernel {
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UNMAP_AFTER_INIT SysFSDeviceMajorNumberAllocations::SysFSDeviceMajorNumberAllocations(SysFSDirectory const& parent_directory, DeviceNodeType device_node_type)
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: SysFSGlobalInformation(parent_directory)
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, m_device_node_type(device_node_type)
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{
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VERIFY(m_device_node_type == DeviceNodeType::Block || m_device_node_type == DeviceNodeType::Character);
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}
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StringView SysFSDeviceMajorNumberAllocations::name() const
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{
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return m_device_node_type == DeviceNodeType::Character ? "chardev_major_allocs"sv : "blockdev_major_allocs"sv;
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}
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UNMAP_AFTER_INIT NonnullRefPtr<SysFSDeviceMajorNumberAllocations> SysFSDeviceMajorNumberAllocations::must_create(SysFSDirectory const& parent_directory, DeviceNodeType device_node_type)
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{
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return adopt_ref_if_nonnull(new (nothrow) SysFSDeviceMajorNumberAllocations(parent_directory, device_node_type)).release_nonnull();
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}
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ErrorOr<void> SysFSDeviceMajorNumberAllocations::try_generate(KBufferBuilder& builder)
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{
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VERIFY(m_device_node_type == DeviceNodeType::Block || m_device_node_type == DeviceNodeType::Character);
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auto array = TRY(JsonArraySerializer<>::try_create(builder));
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if (m_device_node_type == DeviceNodeType::Character) {
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for (auto& allocation : MajorAllocation::s_character_device_numbers) {
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auto major_number_allocation_object = TRY(array.add_object());
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TRY(major_number_allocation_object.add("allocated_number"sv, character_device_family_to_major_number(allocation).value()));
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TRY(major_number_allocation_object.add("family_name"sv, character_device_family_to_string_view(allocation)));
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TRY(major_number_allocation_object.finish());
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}
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} else {
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for (auto& allocation : MajorAllocation::s_block_device_numbers) {
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auto major_number_allocation_object = TRY(array.add_object());
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TRY(major_number_allocation_object.add("allocated_number"sv, block_device_family_to_major_number(allocation).value()));
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TRY(major_number_allocation_object.add("family_name"sv, block_device_family_to_string_view(allocation)));
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TRY(major_number_allocation_object.finish());
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}
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}
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TRY(array.finish());
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return {};
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}
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}
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