mirror of
https://github.com/RGBCube/serenity
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47bfbe343b
- Use KResultOr and TRY() to propagate errors - Check for OOM errors - Move allocation out of constructors There's still a lot more to do here, as SysFS is still quite brittle in the face of memory pressure.
74 lines
2 KiB
C++
74 lines
2 KiB
C++
/*
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* Copyright (c) 2021, 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/FileSystem/SysFS.h>
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#include <Kernel/FileSystem/SysFSComponent.h>
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namespace Kernel {
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static Spinlock s_index_lock;
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static InodeIndex s_next_inode_index { 0 };
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static size_t allocate_inode_index()
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{
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SpinlockLocker lock(s_index_lock);
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s_next_inode_index = s_next_inode_index.value() + 1;
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VERIFY(s_next_inode_index > 0);
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return s_next_inode_index.value();
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}
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SysFSComponent::SysFSComponent(StringView name)
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: m_name(KString::try_create(name).release_nonnull())
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, m_component_index(allocate_inode_index())
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{
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}
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KResult SysFSDirectory::traverse_as_directory(unsigned fsid, Function<bool(FileSystem::DirectoryEntryView const&)> callback) const
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{
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MutexLocker locker(SysFSComponentRegistry::the().get_lock());
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VERIFY(m_parent_directory);
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callback({ ".", { fsid, component_index() }, 0 });
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callback({ "..", { fsid, m_parent_directory->component_index() }, 0 });
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for (auto& component : m_components) {
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InodeIdentifier identifier = { fsid, component.component_index() };
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callback({ component.name(), identifier, 0 });
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}
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return KSuccess;
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}
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RefPtr<SysFSComponent> SysFSDirectory::lookup(StringView name)
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{
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for (auto& component : m_components) {
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if (component.name() == name) {
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return component;
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}
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}
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return {};
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}
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SysFSDirectory::SysFSDirectory(StringView name)
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: SysFSComponent(name)
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{
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}
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SysFSDirectory::SysFSDirectory(StringView name, SysFSDirectory const& parent_directory)
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: SysFSComponent(name)
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, m_parent_directory(parent_directory)
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{
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}
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KResultOr<NonnullRefPtr<SysFSInode>> SysFSDirectory::to_inode(SysFS const& sysfs_instance) const
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{
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return TRY(SysFSDirectoryInode::try_create(sysfs_instance, *this));
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}
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KResultOr<NonnullRefPtr<SysFSInode>> SysFSComponent::to_inode(SysFS const& sysfs_instance) const
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{
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return SysFSInode::try_create(sysfs_instance, *this);
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}
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}
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