Kernel: Add procfs that contains only pids

kernel/include/kernel/FS/ProcFS/FileSystem.h

@@ -0,0 +1,26 @@
+#pragma once
+
+#include <kernel/FS/RamFS/FileSystem.h>
+#include <kernel/FS/RamFS/Inode.h>
+#include <kernel/Process.h>
+
+namespace Kernel
+{
+
+	class ProcFileSystem final : public RamFileSystem
+	{
+	public:
+		static void initialize();
+		static ProcFileSystem& get();
+
+		BAN::ErrorOr<void> on_process_create(Process&);
+		void on_process_delete(Process&);
+
+	private:
+		ProcFileSystem(size_t size);
+
+	private:
+		BAN::RefPtr<RamDirectoryInode> m_root_inode;
+	};
+
+}

kernel/include/kernel/FS/ProcFS/Inode.h

@@ -0,0 +1,23 @@
+#pragma once
+
+#include <kernel/FS/RamFS/FileSystem.h>
+#include <kernel/FS/RamFS/Inode.h>
+#include <kernel/Process.h>
+
+namespace Kernel
+{
+
+	class ProcPidInode final : public RamDirectoryInode
+	{
+	public:
+		static BAN::ErrorOr<BAN::RefPtr<ProcPidInode>> create(Process&, RamFileSystem&, mode_t, uid_t, gid_t);
+		~ProcPidInode() = default;
+
+	private:
+		ProcPidInode(Process&, RamFileSystem&, const FullInodeInfo&);
+
+	private:
+		Process& m_process;
+	};
+
+}