Re: Shutdown filesystem when a thin pool become full

[Brian Foster <bfoster@redhat.com>]

On Tue, Jun 20, 2017 at 08:43:30PM +0200, Gionatan Danti wrote:
> Il 20-06-2017 19:02 Brian Foster ha scritto:
> > 
> > ISTM you might as well write something in userspace that receives a
> > notification from device-mapper and shuts down or remounts the fs if the
> > volume has gone inactive or hit a watermark. I don't think we'd bury
> > anything in XFS that cuts off and then resumes operations based on
> > underlying device errors like that. That sounds like a very crude
> > approach with a narrow use case.
> 
> Absolutely, crude & ugly...
> 
> > 
> > That said, I don't think I'd be opposed to something in XFS that
> > (optionally) shutdown the fs in response to a similar dm notification
> > provided we know with certainty that the underlying device is inactive
> > (and that it can be accomplished relatively cleanly).
> > 
> 
> This would be a much better approach. Any chances to get it implemented?
> About your patches, I really like that they addresses the fallocate
> propagation issue. Are they a work in progress? Any chances to have them
> shipping in mainline kernel?
> 

Not likely anytime soon, at least. Those patches were an experiment for
an idea on how to improve usability in an XFS/dm-thin setup, but
otherwise didn't seem to get much traction. One major downside is that
the solution is specific to XFS.

Brian

> Thanks.
> 
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