Re: [PATCH v2 3/3] xfs: Let the max iomap length be consistent with the writeback code

[Christoph Hellwig]

On Tue, Oct 08, 2024 at 08:36:02AM +1100, Dave Chinner wrote:
> I think this map size limiting is completely unnecessary for
> buffered writeback - buffered writes are throttled against writeback
> by balance_dirty_pages(), not by extent allocation size. The size of
> the delayed allocation or the overwrite map is largely irrelevant -
> we're going to map the entire range during a write, do it just
> doesn't matter what size the mapping is...

Yes.  This goes back all the way to your original iomap prototype,
but even back then balance_dirty_pages should have done all the
work.