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Date:   Thu, 25 Feb 2021 08:35:25 +0100
From:   Christoph Hellwig <>
To:     "Darrick J. Wong" <>
Cc:     Ruan Shiyang <>,
        Christoph Hellwig <>,,,,,,,,,,,,,,
        Goldwyn Rodrigues <>
Subject: Re: [PATCH 5/7] fsdax: Dedup file range to use a compare function

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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