On Thu, Feb 18, 2021 at 08:20:18AM -0800, Darrick J. Wong wrote:
> > I think a nested call like this is necessary.  That's why I use the open
> > code way.
> 
> This might be a good place to implement an iomap_apply2() loop that
> actually /does/ walk all the extents of file1 and file2.  There's now
> two users of this idiom.

Why do we need a special helper for that?

> (Possibly structured as a "get next mappings from both" generator
> function like Matthew Wilcox keeps asking for. :))

OTOH this might be a good first use for that.

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