On Mon, Dec 01, 2014 at 02:03:43AM +0100, Lennart Poettering wrote: > On Mon, 01.12.14 01:41, Richard Weinberger (rich...@nod.at) wrote: > > > CC'ing systemd folks. > > > > Lennart, can you please explain why you need CONFIG_FHANDLE for systemd? > > Maybe I'm reading the source horrible wrong. > > For two usecases: > > a) Being able to detect if something is a mount point. The traditional > way to do this is by stat()ing the dir in question and its parent > and comparing st_dev. That logic is not able to detect bind mounts > however, if destination and the place the mount is at are actually > on the same file system... Thus we check the mount id too, if we > can get our hands on it.
So what you really want in the mount id in st_buf.st_dev, not the underlying device number. i.e. fstatat(dirfd, path, buf, AT_MOUNTID)? Cheers, Dave. -- Dave Chinner da...@fromorbit.com -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
