linux-kernel - Re: [patch 00/13] vfs: add helpers to check r/o bind mounts

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Message-ID: <20080424144815.GI15214@ZenIV.linux.org.uk>
Date:	Thu, 24 Apr 2008 15:48:15 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	akpm@...ux-foundation.org, torvalds@...ux-foundation.org,
	dave@...ux.vnet.ibm.com, ezk@...sunysb.edu, mhalcrow@...ibm.com,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [patch 00/13] vfs: add helpers to check r/o bind mounts

On Thu, Apr 24, 2008 at 04:42:52PM +0200, Miklos Szeredi wrote:

> >  You are right - we do have races there.  Always had.
> > And nfsd_permission() is the next target for continuation of ro-bind
> > series.  Assuming that we don't simply make r/w export to hold will_write
> > all along, in which case all these checks around calls of vfs_...() in
> > there simply go away - that's also an arguable option.
> 
> Yes.  And that _still_ doesn't make the path_*() interface wrong.

It would make it bloody useless for nfsd.  With ecryptfs being a piss-poor
argument in favour of anything other than git rm, what's left?  Another
stack frame in fs/namei.c syscalls?
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