linux-kernel - Re: [PATCH 00/32] VFS based Union Mount (V3)

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Message-ID: <20090521125419.GM30663@sith.mimuw.edu.pl>
Date:	Thu, 21 May 2009 14:54:19 +0200
From:	Jan Rekorajski <baggins@...h.mimuw.edu.pl>
To:	Jan Blunck <jblunck@...e.de>
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	viro@...iv.linux.org.uk, bharata@...ibm.com, dwmw2@...radead.org,
	mszeredi@...e.cz, vaurora@...hat.com
Subject: Re: [PATCH 00/32] VFS based Union Mount (V3)

On Mon, 18 May 2009, Jan Blunck wrote:

> Here is another post of the VFS based union mount implementation.

Is there any chance this will support NFS? I can union-mount tmpfs over
nfs mounted fs, but if I try to mount --union two NFS filesystems I
always get -EBUSY on second mount on the same mountpoint.

Something along these lines:

doesn't matter if I use --union on first mount, the result is always the
same.

mount <--union> -t nfs server:/export/system /mnt
OK
mount --union -t nfs server:/export/profile /mnt
mount.nfs: /mnt is busy or already mounted

I patched mount.nfs so it knows about MS_UNION, and strace shows me that
it passes that flag to kernel.

Jan
-- 
Jan Rekorajski            |  ALL SUSPECTS ARE GUILTY. PERIOD!
baggins<at>mimuw.edu.pl   |  OTHERWISE THEY WOULDN'T BE SUSPECTS, WOULD THEY?
BOFH, MANIAC              |                   -- TROOPS by Kevin Rubio
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