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Kernel: Expose device presence in /sys/dev/char and /sys/dev/block

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These files are not marked as block devices or character devices so they
are not meant to be used as device nodes. The filenames are formatted to
the pattern "major:minor", but a Userland program need to call the parse
these format and inspect the the major and minor numbers and create the
real device nodes in /dev.

Later on, it might be a good idea to ensure we don't create new
SysFSComponents on the heap for each Device, but rather generate
them only when required (and preferably to not create a SysFSComponent
at all if possible).
This commit is contained in:
Liav A 2021-08-14 11:40:37 +03:00 • committed by Andreas Kling
parent 009feefee0
commit 6a9c717a30
5 changed files with 183 additions and 2 deletions
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8
Kernel/FileSystem/SysFS.cpp
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@ -6,6 +6,7 @@
#include <AK/Singleton.h>
#include <AK/StringView.h>
#include <Kernel/Devices/Device.h>
#include <Kernel/FileSystem/SysFS.h>
#include <Kernel/Sections.h>
@ -35,6 +36,11 @@ UNMAP_AFTER_INIT void SysFSComponentRegistry::register_new_component(SysFSCompon
m_root_directory->m_components.append(component);
}
SysFSComponentRegistry::DevicesList& SysFSComponentRegistry::devices_list()
{
return m_devices_list;
}
NonnullRefPtr<SysFSRootDirectory> SysFSRootDirectory::create()
{
return adopt_ref(*new (nothrow) SysFSRootDirectory);
@ -57,7 +63,9 @@ SysFSRootDirectory::SysFSRootDirectory()
: SysFSDirectory(".")
{
auto buses_directory = SysFSBusDirectory::must_create(*this);
auto devices_directory = SysFSDevicesDirectory::must_create(*this);
m_components.append(buses_directory);
m_components.append(devices_directory);
m_buses_directory = buses_directory;
}