Re: [PATCH 7/9] xfs: separate out log shutdown callback processing

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On Wed, Jun 30, 2021 at 04:38:11PM +1000, Dave Chinner wrote:
> From: Dave Chinner <dchinner@xxxxxxxxxx>
> 
> The iclog callback processing done during a forced log shutdown has
> different logic to normal runtime IO completion callback processing.
> Separate out eh shutdown callbacks into their own function and call
> that from the shutdown code instead.
> 
> We don't need this shutdown specific logic in the normal runtime
> completion code - we'll always run the shutdown version on shutdown,
> and it will do what shutdown needs regardless of whether there are
> racing IO completion callbacks scheduled or in progress. Hence we
> can also simplify the normal IO completion callpath and only abort
> if shutdown occurred while we actively were processing callbacks.

What prevents a log shutdown from coming in during the callback
processing?  Or is there a reason why we simply don't care for that
case?



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