Internals of ext2fs

Virtual File Systems

      struct super_block {
        ...
        struct super_operations *s_op;
        ...
      }

Just by way of example:

      struct super_operations {
        void (*read_inode) (struct inode *);
        void (*dirty_inode) (struct inode *);
        void (*write_inode) (struct inode *, int);
        void (*delete_inode) (struct inode *);
        void (*write_super) (struct super_block *);
        int (*statfs) (struct super_block *, struct statfs *);
        ...
      };

(I omitted several other operations here.)
End of digression