Re: [PATCH] xfs: don't BUG() on mixed direct and mapped I/O

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On Mon, Oct 31, 2016 at 10:14:28AM -0400, Brian Foster wrote:
> We've had reports of generic/095 causing XFS to BUG() in
> __xfs_get_blocks() due to the existence of delalloc blocks on a direct
> I/O read. generic/095 issues a mix of various types of I/O, including
> direct and memory mapped I/O to a single file.

Can you explain the scenario in which case this happens in a little
more detail?  The patch looks fine to me, but I'd really like to
understand how this happens.
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