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        structure and set it appropriately in ntfs_read_locked_inode().
      - Implement a new inode type "index" to allow efficient access to the
        indices found in various system files and adapt inode handling
        accordingly (fs/ntfs/inode.[hc]).  An index inode is essentially an
        attribute inode (NInoAttr() is true) with an attribute type of
        AT_INDEX_ALLOCATION.  As such, it is no longer allowed to call
        ntfs_attr_iget() with an attribute type of AT_INDEX_ALLOCATION as
        there would be no way to distinguish between normal attribute inodes
        and index inodes.  The function to obtain an index inode is
        ntfs_index_iget() and it uses the helper function
        ntfs_read_locked_index_inode().  Note, we do not overload
        ntfs_attr_iget() as indices consist of multiple attributes so using
        ntfs_attr_iget() to obtain an index inode would be confusing.
Signed-off-by: Anton Altaparmakov <aia21@cantab.net>