[OpenAFS-devel] Breaking callbacks on unlink

[Matt W. Benjamin]

Ie, "stick around" for some period, or pending some other metric.  Perhaps under control of the server administrator.  I recall someone objecting to that.  I think my preference would be for site preference, fwiw.

Thanks for your observation,

Matt

----- "Matt W. Benjamin" <matt@linuxbox.com> wrote:

> Hi,
> 
> Well, it certainly could do the latter.
> 
> Matt
> 
> ----- "Simon Wilkinson" <simonxwilkinson@gmail.com> wrote:
> 
> > On 25 Feb 2012, at 23:54, Matt W. Benjamin wrote:
> >
> > > well,
> > >
> > > 1. the response to unlink w/XCB is an indication of unlink
> > > 2. if rxgk is in use (there is published code of at least alpha
> > quality implementing, iirc, rxgk with callback channel protection)
> > >
> > > So...
> >
> > By the time that the callback break arrives, the file has already
> > disappeared from the view of the client. So, even with extended
> > callbacks the client doesn't have a chance to grab any chunks of the
> > file that it may be missing. You'd also require that a client
> > constantly refresh callbacks for any files which it has open, which
> > has potential fileserver performance implications.
> >
> > I think any solution to this problem is going to depend upon
> defining
> > new RPC behaviour - either for an open/close pair (which has issues
> > potential issues with malicious, or disappearing clients), or in
> > allowing deleted content to persist on the fileserver so that it can
> > be fetched by a client receiving a callback break.
> >
> > Cheers,
> >
> > Simon.
> >
> > _______________________________________________
> > OpenAFS-devel mailing list
> > OpenAFS-devel@openafs.org
> > https://lists.openafs.org/mailman/listinfo/openafs-devel
> 
> --
> Matt Benjamin
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-- 
Matt Benjamin
The Linux Box
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http://linuxbox.com

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