• Miklos Szeredi's avatar
    ovl: stack file ops · d1d04ef8
    Miklos Szeredi authored
    
    
    Implement file operations on a regular overlay file.  The underlying file
    is opened separately and cached in ->private_data.
    
    It might be worth making an exception for such files when accounting in
    nr_file to confirm to userspace expectations.  We are only adding a small
    overhead (248bytes for the struct file) since the real inode and dentry are
    pinned by overlayfs anyway.
    
    This patch doesn't have any effect, since the vfs will use d_real() to find
    the real underlying file to open.  The patch at the end of the series will
    actually enable this functionality.
    
    AV: make it use open_with_fake_path(), don't mess with override_creds
    
    SzM: still need to mess with override_creds() until no fs uses
    current_cred() in their open method.
    
    Signed-off-by: default avatarMiklos Szeredi <mszeredi@redhat.com>
    Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
    d1d04ef8