[PATCH v7 21/24] iomap: Restructure iomap_readpages_actor

[Christoph Hellwig]

On Wed, Feb 19, 2020 at 01:01:00PM -0800, Matthew Wilcox wrote:
> From: "Matthew Wilcox (Oracle)" <willy at infradead.org>
> 
> By putting the 'have we reached the end of the page' condition at the end
> of the loop instead of the beginning, we can remove the 'submit the last
> page' code from iomap_readpages().  Also check that iomap_readpage_actor()
> didn't return 0, which would lead to an endless loop.

I'm obviously biassed a I wrote the original code, but I find the new
very much harder to understand (not that the previous one was easy, this
is tricky code..).