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Date:	Mon, 8 Jun 2015 17:48:49 +0200
From:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: bind mounts in fstab
Message-ID:	<20150608154849.GB13266@calimero.vinschen.de>
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References:	<loom DOT 20150608T122736-327 AT post DOT gmane DOT org> <20150608124548 DOT GG3005 AT calimero DOT vinschen DOT de> <loom DOT 20150608T164231-729 AT post DOT gmane DOT org>
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On Jun  8 14:53, Achim Gratz wrote:
> Corinna Vinschen <corinna-cygwin <at> cygwin.com> writes:
>=20
> > > //server/some/directory /mnt/server-share none binary 0 0
> > > #bind mounts
> > > /mnt/server-share/some/other/directory /mnt/task1 none binary,bind
> > >=20
> > > That works well until I try to add another such bind mount and activa=
te it
> > > via 'mount -a' without starting a new Cygwin session.  Cygwin tries to
> > > create a mount to the underlying local directory of /mnt/task1 instea=
d of
> > > binding, which doesn't work of course.
> >=20
> > How does your second bind mount look like?
>=20
> # new bind mount
> /mnt/server-share/some/other/directory /mnt/task2 none binary,bind
>=20
> Which tries to mount to=20
>=20
> %CYGWIN_ROOT%/mnt/server-share/some/other/directory
>=20
> when I do a 'mount -a' in the same session.  If I instead put in
>=20
> //server/some/directory/some/other/directory none binary 0 0
>=20
> then everything works OK, AFAICS.  This might be related to the fact that
> some bind mounts appear before the physical mounts in the mount table (not
> in fstab!), at least if the mounts are processed in the same order.

Easily reproducible, thank you.  I think I found the culprit.  mount(1)
always converts the mnt_fsname field to backslash notation.  That breaks
converting the bind mount from the expected POSIX notation to a valid
Win32 path.

I fixed mount(1) in git.  If you're set up to build Cygwin yourself, you
want to give the patch a try.  No new DLL, just call the new mount(1)
tool.  Otherwise I'll build a new snapshot today or tomorrow (I'm hacking
on something else right now).


Thanks,
Corinna

--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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