Kernel: Move Inode to its own files.

Kernel/FileSystem/Inode.h

@@ -0,0 +1,92 @@
+#pragma once
+
+#include <AK/Retainable.h>
+#include <AK/AKString.h>
+#include <AK/Function.h>
+#include <AK/WeakPtr.h>
+#include <Kernel/FileSystem/InodeIdentifier.h>
+#include <Kernel/FileSystem/InodeMetadata.h>
+#include <Kernel/FileSystem/FileSystem.h>
+#include <Kernel/KResult.h>
+#include <Kernel/Lock.h>
+
+class FileDescriptor;
+class LocalSocket;
+class VMObject;
+
+class Inode : public Retainable<Inode> {
+    friend class VFS;
+    friend class FS;
+public:
+    virtual ~Inode();
+
+    virtual void one_retain_left() { }
+
+    FS& fs() { return m_fs; }
+    const FS& fs() const { return m_fs; }
+    unsigned fsid() const;
+    unsigned index() const { return m_index; }
+
+    size_t size() const { return metadata().size; }
+    bool is_symlink() const { return metadata().is_symlink(); }
+    bool is_directory() const { return metadata().is_directory(); }
+    bool is_character_device() const { return metadata().is_character_device(); }
+    mode_t mode() const { return metadata().mode; }
+
+    InodeIdentifier identifier() const { return { fsid(), index() }; }
+    virtual InodeMetadata metadata() const = 0;
+
+    ByteBuffer read_entire(FileDescriptor* = nullptr) const;
+
+    virtual ssize_t read_bytes(off_t, ssize_t, byte* buffer, FileDescriptor*) const = 0;
+    virtual bool traverse_as_directory(Function<bool(const FS::DirectoryEntry&)>) const = 0;
+    virtual InodeIdentifier lookup(const String& name) = 0;
+    virtual String reverse_lookup(InodeIdentifier) = 0;
+    virtual ssize_t write_bytes(off_t, ssize_t, const byte* data, FileDescriptor*) = 0;
+    virtual KResult add_child(InodeIdentifier child_id, const String& name, byte file_type) = 0;
+    virtual KResult remove_child(const String& name) = 0;
+    virtual RetainPtr<Inode> parent() const = 0;
+    virtual size_t directory_entry_count() const = 0;
+    virtual KResult chmod(mode_t) = 0;
+    virtual KResult chown(uid_t, gid_t) = 0;
+    virtual KResult truncate(off_t) { return KSuccess; }
+
+    LocalSocket* socket() { return m_socket.ptr(); }
+    const LocalSocket* socket() const { return m_socket.ptr(); }
+    bool bind_socket(LocalSocket&);
+    bool unbind_socket();
+
+    bool is_metadata_dirty() const { return m_metadata_dirty; }
+
+    virtual int set_atime(time_t);
+    virtual int set_ctime(time_t);
+    virtual int set_mtime(time_t);
+    virtual int increment_link_count();
+    virtual int decrement_link_count();
+
+    virtual void flush_metadata() = 0;
+
+    void will_be_destroyed();
+
+    void set_vmo(VMObject&);
+    VMObject* vmo() { return m_vmo.ptr(); }
+    const VMObject* vmo() const { return m_vmo.ptr(); }
+
+    static void sync();
+
+protected:
+    Inode(FS& fs, unsigned index);
+    void set_metadata_dirty(bool b) { m_metadata_dirty = b; }
+    void inode_contents_changed(off_t, ssize_t, const byte*);
+    void inode_size_changed(size_t old_size, size_t new_size);
+
+    mutable Lock m_lock { "Inode" };
+
+private:
+    FS& m_fs;
+    unsigned m_index { 0 };
+    WeakPtr<VMObject> m_vmo;
+    RetainPtr<LocalSocket> m_socket;
+    bool m_metadata_dirty { false };
+};
+