linux-kernel - Re: Important for fs devs: rcu-walk merged upstream

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Message-Id: <E1Pdg7I-0005Zl-Od@pomaz-ex.szeredi.hu>
Date:	Fri, 14 Jan 2011 10:38:44 +0100
From:	Miklos Szeredi <miklos@...redi.hu>
To:	Nick Piggin <npiggin@...il.com>
CC:	miklos@...redi.hu, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: Important for fs devs: rcu-walk merged upstream

On Fri, 14 Jan 2011, Nick Piggin wrote:
> On Fri, Jan 14, 2011 at 7:45 PM, Miklos Szeredi <miklos@...redi.hu> wrote:
> > On Fri, 14 Jan 2011, Nick Piggin wrote:
> >> On Fri, Jan 14, 2011 at 3:18 AM, Miklos Szeredi <miklos@...redi.hu> wrote:
> 
> >> Surely you'd need some filtering anyway? I don't think any function
> >> involving path lookup could sanely return -ECHILD.
> >
> > No, but not filtering doesn't normally hurt.  And it's not quite
> > trivial deciding what should be allowed and what shoudln't, and the
> > filter would have to be updated for each addition of a new errno.  So
> > I'm not sure I want to go there.
> 
> Well if you allow untrusted filesystems it is possible that
> -ECHILD return will do something a bit silly. So it would be
> good to filter it I guess.

What could it do (other than resulting in a silly error printout)?

If we'd want errno filtering for fuse how would you define "sane"?

> >> That said, it probably is a good idea to have a new errno.
> >
> > Yeah, that makes the fitering much easier.
> 
> How so? Would -ECHILD ever be sane to return? I'm not
> arguing against changing it but I just want to know what
> the issue is there.

All kernel private errnos are >=512 (see <linux/errno.h), filtering
out those is quite easy and clearly desirable.

Thanks,
Miklos
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