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b02ee664e7
To do this we also need to get rid of LockRefPtrs in the USB code as well. Most of the SysFS nodes are statically generated during boot and are not mutated afterwards. The same goes for general device code - once we generate the appropriate SysFS nodes, we almost never mutate the node pointers afterwards, making locking unnecessary.
70 lines
2.2 KiB
C++
70 lines
2.2 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/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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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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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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