Import all this stuff into a single repo called Serenity.

Author: https://github.com/awesomekling 🔰
Commit: 5a30055157

VirtualFileSystem/FileSystem.cpp

@@ -0,0 +1,45 @@
+#include <AK/Assertions.h>
+#include <AK/HashMap.h>
+#include "FileSystem.h"
+
+static dword s_lastFileSystemID = 0;
+
+static HashMap<dword, FileSystem*>& fileSystems()
+{
+    static auto* map = new HashMap<dword, FileSystem*>();
+    return *map;
+}
+
+FileSystem::FileSystem()
+    : m_id(++s_lastFileSystemID)
+{
+    fileSystems().set(m_id, this);
+}
+
+FileSystem::~FileSystem()
+{
+    // FIXME: Needs HashMap::remove()!
+    //fileSystems().remove(m_id);
+}
+
+FileSystem* FileSystem::fromID(dword id)
+{
+    auto it = fileSystems().find(id);
+    if (it != fileSystems().end())
+        return (*it).value;
+    return nullptr;
+}
+
+InodeIdentifier FileSystem::childOfDirectoryInodeWithName(InodeIdentifier inode, const String& name)
+{
+    InodeIdentifier foundInode;
+    enumerateDirectoryInode(inode, [&] (const DirectoryEntry& entry) {
+        if (entry.name == name) {
+            foundInode = entry.inode;
+            return false;
+        }
+        return true;
+    });
+    return foundInode;
+}
+