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

[Nick Piggin]

On Fri, Jan 14, 2011 at 7:45 PM, Miklos Szeredi <miklos@xxxxxxxxxx> wrote:
> On Fri, 14 Jan 2011, Nick Piggin wrote:
>> On Fri, Jan 14, 2011 at 3:18 AM, Miklos Szeredi <miklos@xxxxxxxxxx> 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.


>> 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.
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