Kernel: Move SystemExposed.* => FileSystem/SysFSComponent.*

Kernel/FileSystem/SysFSComponent.cpp

@@ -0,0 +1,74 @@
+/*
+ * Copyright (c) 2021, Liav A. <liavalb@hotmail.co.il>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <Kernel/FileSystem/SysFS.h>
+#include <Kernel/FileSystem/SysFSComponent.h>
+
+namespace Kernel {
+
+static SpinLock<u8> s_index_lock;
+static InodeIndex s_next_inode_index { 0 };
+
+static size_t allocate_inode_index()
+{
+    ScopedSpinLock lock(s_index_lock);
+    s_next_inode_index = s_next_inode_index.value() + 1;
+    VERIFY(s_next_inode_index > 0);
+    return s_next_inode_index.value();
+}
+
+SysFSComponent::SysFSComponent(StringView name)
+    : m_name(KString::try_create(name).release_nonnull())
+    , m_component_index(allocate_inode_index())
+{
+}
+
+KResult SysFSDirectory::traverse_as_directory(unsigned fsid, Function<bool(FileSystem::DirectoryEntryView const&)> callback) const
+{
+    Locker locker(SysFSComponentRegistry::the().m_lock);
+    VERIFY(m_parent_folder);
+    callback({ ".", { fsid, component_index() }, 0 });
+    callback({ "..", { fsid, m_parent_folder->component_index() }, 0 });
+
+    for (auto& component : m_components) {
+        InodeIdentifier identifier = { fsid, component.component_index() };
+        callback({ component.name(), identifier, 0 });
+    }
+    return KSuccess;
+}
+
+RefPtr<SysFSComponent> SysFSDirectory::lookup(StringView name)
+{
+    for (auto& component : m_components) {
+        if (component.name() == name) {
+            return component;
+        }
+    }
+    return {};
+}
+
+SysFSDirectory::SysFSDirectory(StringView name)
+    : SysFSComponent(name)
+{
+}
+
+SysFSDirectory::SysFSDirectory(StringView name, SysFSDirectory const& parent_folder)
+    : SysFSComponent(name)
+    , m_parent_folder(parent_folder)
+{
+}
+
+NonnullRefPtr<Inode> SysFSDirectory::to_inode(SysFS const& sysfs_instance) const
+{
+    return SysFSDirectoryInode::create(sysfs_instance, *this);
+}
+
+NonnullRefPtr<Inode> SysFSComponent::to_inode(SysFS const& sysfs_instance) const
+{
+    return SysFSInode::create(sysfs_instance, *this);
+}
+
+}