Re: [PATCH v2] xfs: fix iclog release error check race with shutdown

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On Wed, Feb 19, 2020 at 02:00:40PM +1100, Dave Chinner wrote:
> > Now the real question, which is a bit out of scope for this patch is
> > why we even have XLOG_STATE_IOERROR?
> 
> I _think_ it was originally intended to prevent log shutdown
> recursion when shutdowns trigger log IO errors and try to shut down
> again.
> 
> > Wouldn't it make more sense
> > to just user the shutdown flag in the mount structure and avoid the
> > extra state complexity and thus clean up this whole mess?
> 
> I'd suggest that XLOG_FORCED_SHUTDOWN() is more appropriate in code
> that has no reason to know anything about the xfs_mount state e.g.
> the code in xlog_state_release_iclog() has a log and iclog context
> and introducing a xfs-mount context to check for shutdown is a
> fairly significant layering violation deep inside the internal log
> implementation...

Yes, XLOG_FORCED_SHUTDOWN makes more sense.  I did in fact hack up
a quick patch for that last night, but I'm going to hold it back until
the bug fix is merged.



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