linux-kernel - Re: [PATCH v7 5/8] iomap: Introduce iomap

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Date:   Mon, 23 Aug 2021 14:58:24 +0200
From:   Christoph Hellwig <hch@....de>
To:     Shiyang Ruan <ruansy.fnst@...itsu.com>
Cc:     djwong@...nel.org, hch@....de, linux-xfs@...r.kernel.org,
        dan.j.williams@...el.com, david@...morbit.com,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        nvdimm@...ts.linux.dev, rgoldwyn@...e.de, viro@...iv.linux.org.uk,
        willy@...radead.org
Subject: Re: [PATCH v7 5/8] iomap: Introduce iomap_iter2 for two files

On Mon, Aug 16, 2021 at 02:03:56PM +0800, Shiyang Ruan wrote:
> Some operations, such as comparing a range of data in two files under
> fsdax mode, requires nested iomap_begin()/iomap_end() on two files.
> Thus, we introduce iomap_iter2() to accept two iteraters to operate
> action on two files.

We really should not need both.  We should be able to be in two
nested loops, just operating on the part that both cover (for which
a helper might be useful).