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/*
* Copyright (c) 2021, Liav A. <liavalb@hotmail.co.il>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Singleton.h>
#include <AK/StringView.h>
#include <Kernel/FileSystem/SysFS.h>
#include <Kernel/Sections.h>
namespace Kernel {
static AK::Singleton<SysFSComponentRegistry> s_the;
SysFSComponentRegistry& SysFSComponentRegistry::the()
{
return *s_the;
}
UNMAP_AFTER_INIT void SysFSComponentRegistry::initialize()
{
VERIFY(!s_the.is_initialized());
s_the.ensure_instance();
}
UNMAP_AFTER_INIT SysFSComponentRegistry::SysFSComponentRegistry()
: m_root_directory(SysFSRootDirectory::create())
{
}
UNMAP_AFTER_INIT void SysFSComponentRegistry::register_new_component(SysFSComponent& component)
{
Locker locker(m_lock);
m_root_directory->m_components.append(component);
}
NonnullRefPtr<SysFSRootDirectory> SysFSRootDirectory::create()
{
return adopt_ref(*new (nothrow) SysFSRootDirectory);
}
KResult SysFSRootDirectory::traverse_as_directory(unsigned fsid, Function<bool(FileSystem::DirectoryEntryView const&)> callback) const
{
Locker locker(SysFSComponentRegistry::the().get_lock());
callback({ ".", { fsid, component_index() }, 0 });
callback({ "..", { fsid, 0 }, 0 });
for (auto& component : m_components) {
InodeIdentifier identifier = { fsid, component.component_index() };
callback({ component.name(), identifier, 0 });
}
return KSuccess;
}
SysFSRootDirectory::SysFSRootDirectory()
: SysFSDirectory(".")
{
auto buses_directory = SysFSBusDirectory::must_create(*this);
m_components.append(buses_directory);
m_buses_directory = buses_directory;
}
NonnullRefPtr<SysFS> SysFS::create()
{
return adopt_ref(*new (nothrow) SysFS);
}
SysFS::SysFS()
: m_root_inode(SysFSComponentRegistry::the().root_directory().to_inode(*this))
{
}
SysFS::~SysFS()
{
}
bool SysFS::initialize()
{
return true;
}
NonnullRefPtr<Inode> SysFS::root_inode() const
{
return *m_root_inode;
}
NonnullRefPtr<SysFSInode> SysFSInode::create(SysFS const& fs, SysFSComponent const& component)
{
return adopt_ref(*new (nothrow) SysFSInode(fs, component));
}
SysFSInode::SysFSInode(SysFS const& fs, SysFSComponent const& component)
: Inode(const_cast<SysFS&>(fs), component.component_index())
, m_associated_component(component)
{
}
KResultOr<size_t> SysFSInode::read_bytes(off_t offset, size_t count, UserOrKernelBuffer& buffer, FileDescription* fd) const
{
return m_associated_component->read_bytes(offset, count, buffer, fd);
}
KResult SysFSInode::traverse_as_directory(Function<bool(FileSystem::DirectoryEntryView const&)>) const
{
VERIFY_NOT_REACHED();
}
RefPtr<Inode> SysFSInode::lookup(StringView)
{
VERIFY_NOT_REACHED();
}
InodeMetadata SysFSInode::metadata() const
{
Locker locker(m_inode_lock);
InodeMetadata metadata;
metadata.inode = { fsid(), m_associated_component->component_index() };
metadata.mode = S_IFREG | S_IRUSR | S_IRGRP | S_IROTH;
metadata.uid = 0;
metadata.gid = 0;
metadata.size = m_associated_component->size();
metadata.mtime = mepoch;
return metadata;
}
void SysFSInode::flush_metadata()
{
}
KResultOr<size_t> SysFSInode::write_bytes(off_t offset, size_t count, UserOrKernelBuffer const& buffer, FileDescription* fd)
{
return m_associated_component->write_bytes(offset, count, buffer, fd);
}
KResultOr<NonnullRefPtr<Inode>> SysFSInode::create_child(StringView, mode_t, dev_t, uid_t, gid_t)
{
return EROFS;
}
KResult SysFSInode::add_child(Inode&, StringView const&, mode_t)
{
return EROFS;
}
KResult SysFSInode::remove_child(StringView const&)
{
return EROFS;
}
KResult SysFSInode::chmod(mode_t)
{
return EPERM;
}
KResult SysFSInode::chown(uid_t, gid_t)
{
return EPERM;
}
KResult SysFSInode::truncate(u64)
{
return EPERM;
}
NonnullRefPtr<SysFSDirectoryInode> SysFSDirectoryInode::create(SysFS const& sysfs, SysFSComponent const& component)
{
return adopt_ref(*new (nothrow) SysFSDirectoryInode(sysfs, component));
}
SysFSDirectoryInode::SysFSDirectoryInode(SysFS const& fs, SysFSComponent const& component)
: SysFSInode(fs, component)
, m_parent_fs(const_cast<SysFS&>(fs))
{
}
SysFSDirectoryInode::~SysFSDirectoryInode()
{
}
InodeMetadata SysFSDirectoryInode::metadata() const
{
Locker locker(m_inode_lock);
InodeMetadata metadata;
metadata.inode = { fsid(), m_associated_component->component_index() };
metadata.mode = S_IFDIR | S_IRUSR | S_IRGRP | S_IROTH | S_IXOTH;
metadata.uid = 0;
metadata.gid = 0;
metadata.size = 0;
metadata.mtime = mepoch;
return metadata;
}
KResult SysFSDirectoryInode::traverse_as_directory(Function<bool(FileSystem::DirectoryEntryView const&)> callback) const
{
Locker locker(m_parent_fs.m_lock);
return m_associated_component->traverse_as_directory(m_parent_fs.fsid(), move(callback));
}
RefPtr<Inode> SysFSDirectoryInode::lookup(StringView name)
{
Locker locker(m_parent_fs.m_lock);
auto component = m_associated_component->lookup(name);
if (!component)
return {};
return component->to_inode(m_parent_fs);
}
SysFSBusDirectory& SysFSComponentRegistry::buses_directory()
{
return *m_root_directory->m_buses_directory;
}
void SysFSComponentRegistry::register_new_bus_directory(SysFSDirectory& new_bus_directory)
{
VERIFY(!m_root_directory->m_buses_directory.is_null());
m_root_directory->m_buses_directory->m_components.append(new_bus_directory);
}
UNMAP_AFTER_INIT NonnullRefPtr<SysFSBusDirectory> SysFSBusDirectory::must_create(SysFSRootDirectory const& parent_directory)
{
auto directory = adopt_ref(*new (nothrow) SysFSBusDirectory(parent_directory));
return directory;
}
UNMAP_AFTER_INIT SysFSBusDirectory::SysFSBusDirectory(SysFSRootDirectory const& parent_directory)
: SysFSDirectory("bus"sv, parent_directory)
{
}
}
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