linux-kernel - Re: [GIT PULL] fuse fix for 2.6.39

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Date:	Thu, 12 May 2011 11:01:12 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Trond Myklebust <Trond.Myklebust@...app.com>
Cc:	Miklos Szeredi <miklos@...redi.hu>,
	Al Viro <viro@...iv.linux.org.uk>,
	Christoph Hellwig <hch@....de>, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org
Subject: Re: [GIT PULL] fuse fix for 2.6.39

On Thu, May 12, 2011 at 10:46 AM, Trond Myklebust
<Trond.Myklebust@...app.com> wrote:
>
> I was thinking rather of just returning an EIO if people try. We know
> that there are breakages w.r.t. certain operations as I pointed out in
> my previous email.

Umm. Returning an error is ok, but only if you _need_ to return an error.

Returning an error because you don't like it - that's just wrong.

So I would seriously suggest you return an error only when you really
need something from the nd. So I'd suggest
 - for the automount case, return an error, since you can't change the filp
 - for the LOOKUP_RCU case, just do the "nd && (nd->flags & LOOKUP_RCU)"

The really doesn't seem to be many cases that really need the nd, so
why make it a hard error? *Most* users of nd already check for NULL,
either directly or indirectly (ie "if (!is_atomic_open(nd)) goto
no_open")

                   Linus
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