On Mon, Jun 28, 2021 at 06:47:58PM +0100, Christoph Hellwig wrote: > On Mon, Jun 28, 2021 at 06:39:09PM +0100, Matthew Wilcox wrote: > > Not hugely happy with either of these options, tbh. I'd rather we apply > > a patch akin to this one (plucked from the folio tree), so won't apply: > > > so permit pages without an iop to enter writeback and create an iop > > *then*. Would that solve your problem? > > It is the right thing to do, especially when combined with a feature > patch to not bother to create the iomap_page structure on small > block size file systems when the extent covers the whole page. We don't know the extent layout at the point where *this* patch creates iomap_pages during writeback. I imagine we can delay creating one until we find out what our destination layout will be?
