Re: [PATCH] autofs4 - use lookup access intent to supportrecursive bind mounts

From: Ian Kent
Date: Mon Apr 28 2008 - 02:39:29 EST



On Mon, 2008-04-28 at 07:22 +0100, Al Viro wrote:
> On Mon, Apr 28, 2008 at 02:14:54PM +0800, Ian Kent wrote:
> >
> > Hi Andrew,
> >
> > For autofs maps that recursively reference other map entries in their
> > mount point path we need to ensure that these mounts are performed
> > prior to the current mount request being done. We've used the access
> > system call, made just prior to performing the mount, to make this
> > happen. In the case of bind mounts, however, the lookup flags in
> > the path walk don't trigger a mount. To do this we need to also
> > trigger a mount when we see the LOOKUP_ACCESS flag.
>
> That's too fscking bad, since ->lookup() is about to lose access to
> nameidata *and* flags for anything but the last step. IOW, we'll need
> cleaner solution...

Spell it out for me please!
Ian

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/