• Miklos Szeredi's avatar
    vfs: add vfs_tmpfile_open() helper · 22873dea
    Miklos Szeredi authored
    This helper unifies tmpfile creation with opening.
    
    Existing vfs_tmpfile() callers outside of fs/namei.c will be converted to
    using this helper.  There are two such callers: cachefile and overlayfs.
    
    The cachefiles code currently uses the open_with_fake_path() helper to open
    the tmpfile, presumably to disable accounting of the open file.  Overlayfs
    uses tmpfile for copy_up, which means these struct file instances will be
    short lived, hence it doesn't really matter if they are accounted or not.
    Disable accounting in this helper too, which should be okay for both
    callers.
    
    Add MAY_OPEN permission checking for consistency.  Like for create(2)
    read/write permissions are not checked.
    Reviewed-by: default avatarChristian Brauner (Microsoft) <brauner@kernel.org>
    Signed-off-by: default avatarMiklos Szeredi <mszeredi@redhat.com>
    22873dea
namei.c 138 KB