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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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76
Kernel/FileSystem/SysFS/Subsystems/Devices/Storage/DeviceAttribute.cpp Normal file
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/*
* Copyright (c) 2022, Liav A. <liavalb@hotmail.co.il>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <Kernel/Bus/PCI/API.h>
#include <Kernel/Bus/PCI/Access.h>
#include <Kernel/Debug.h>
#include <Kernel/FileSystem/SysFS/Subsystems/Devices/Storage/DeviceAttribute.h>
#include <Kernel/Sections.h>
namespace Kernel {
StringView StorageDeviceAttributeSysFSComponent::name() const
{
switch (m_type) {
case Type::EndLBA:
return "last_lba"sv;
case Type::SectorSize:
return "sector_size"sv;
case Type::CommandSet:
return "command_set"sv;
case Type::InterfaceType:
return "interface_type"sv;
default:
VERIFY_NOT_REACHED();
}
}
NonnullRefPtr<StorageDeviceAttributeSysFSComponent> StorageDeviceAttributeSysFSComponent::must_create(StorageDeviceSysFSDirectory const& device_directory, Type type)
{
return adopt_ref(*new (nothrow) StorageDeviceAttributeSysFSComponent(device_directory, type));
}
StorageDeviceAttributeSysFSComponent::StorageDeviceAttributeSysFSComponent(StorageDeviceSysFSDirectory const& device_directory, Type type)
: SysFSComponent()
, m_device(device_directory.device({}))
, m_type(type)
{
}
ErrorOr<size_t> StorageDeviceAttributeSysFSComponent::read_bytes(off_t offset, size_t count, UserOrKernelBuffer& buffer, OpenFileDescription*) const
{
auto blob = TRY(try_to_generate_buffer());
if ((size_t)offset >= blob->size())
return 0;
ssize_t nread = min(static_cast<off_t>(blob->size() - offset), static_cast<off_t>(count));
TRY(buffer.write(blob->data() + offset, nread));
return nread;
}
ErrorOr<NonnullOwnPtr<KBuffer>> StorageDeviceAttributeSysFSComponent::try_to_generate_buffer() const
{
OwnPtr<KString> value;
switch (m_type) {
case Type::EndLBA:
value = TRY(KString::formatted("{}", m_device->max_addressable_block()));
break;
case Type::SectorSize:
value = TRY(KString::formatted("{}", m_device->block_size()));
break;
case Type::CommandSet:
value = TRY(KString::formatted("{}", m_device->command_set_to_string_view()));
break;
case Type::InterfaceType:
value = TRY(KString::formatted("{}", m_device->interface_type_to_string_view()));
break;
default:
VERIFY_NOT_REACHED();
}
return KBuffer::try_create_with_bytes("SysFS StorageDeviceAttributeComponent buffer"sv, value->view().bytes());
}
}