• Miklos Szeredi's avatar
    ovl: constant d_ino for non-merge dirs · 4edb83bb
    Miklos Szeredi authored
    Impure directories are ones which contain objects with origins (i.e. those
    that have been copied up).  These are relevant to readdir operation only
    because of the d_ino field, no other transformation is necessary.  Also a
    directory can become impure between two getdents(2) calls.
    
    This patch creates a cache for impure directories.  Unlike the cache for
    merged directories, this one only contains entries with origin and is not
    refcounted but has a its lifetime tied to that of the dentry.
    
    Similarly to the merged cache, the impure cache is invalidated based on a
    version number.  This version number is incremented when an entry with
    origin is added or removed from the directory.
    
    If the cache is empty, then the impure xattr is removed from the directory.
    
    This patch also fixes up handling of d_ino for the ".." entry if the parent
    directory is merged.
    Signed-off-by: default avatarMiklos Szeredi <mszeredi@redhat.com>
    4edb83bb
overlayfs.h 11 KB