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Date: Mon, 1 Dec 2014 14:54:26 +1100 From: Dave Chinner <david@...morbit.com> To: Lennart Poettering <mzxreary@...inter.de> Cc: Richard Weinberger <richard@....at>, gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org, "systemd-devel@...ts.freedesktop.org" <systemd-devel@...ts.freedesktop.org> Subject: Re: [PATCH] x86: defconfig: Enable CONFIG_FHANDLE On Mon, Dec 01, 2014 at 02:03:43AM +0100, Lennart Poettering wrote: > On Mon, 01.12.14 01:41, Richard Weinberger (richard@....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 david@...morbit.com -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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