linux-kernel - Re: [RESEND PATCH v2.1 07/10] iomap: Introduce iomap

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Date:   Thu, 11 Mar 2021 13:30:02 +0100
From:   Christoph Hellwig <hch@....de>
To:     Shiyang Ruan <ruansy.fnst@...itsu.com>
Cc:     linux-kernel@...r.kernel.org, linux-xfs@...r.kernel.org,
        linux-nvdimm@...ts.01.org, linux-fsdevel@...r.kernel.org,
        darrick.wong@...cle.com, dan.j.williams@...el.com,
        willy@...radead.org, jack@...e.cz, viro@...iv.linux.org.uk,
        linux-btrfs@...r.kernel.org, ocfs2-devel@....oracle.com,
        david@...morbit.com, hch@....de, rgoldwyn@...e.de
Subject: Re: [RESEND PATCH v2.1 07/10] iomap: Introduce iomap_apply2() for
 operations on two files

On Thu, Mar 04, 2021 at 01:41:42PM +0800, Shiyang Ruan wrote:
> Some operations, such as comparing a range of data in two files under
> fsdax mode, requires nested iomap_open()/iomap_end() on two file.  Thus,
> we introduce iomap_apply2() to accept arguments from two files and
> iomap_actor2_t for actions on two files.

I still wonder if adding the iter based iomap API that willy proposed
would be a better fit here.  In that case we might not even need
a special API for the double iteration.