linux-kernel - Re: [PATCH v6 4/5] fs, xfs: introduce MAP_DIRECT for creating block-map-atomic file ranges

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Message-ID: <20170824161152.GB27591@lst.de>
Date:   Thu, 24 Aug 2017 18:11:52 +0200
From:   Christoph Hellwig <hch@....de>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     akpm@...ux-foundation.org, Jan Kara <jack@...e.cz>,
        "Darrick J. Wong" <darrick.wong@...cle.com>,
        linux-api@...r.kernel.org, linux-nvdimm@...ts.01.org,
        Dave Chinner <david@...morbit.com>,
        linux-kernel@...r.kernel.org, linux-xfs@...r.kernel.org,
        linux-mm@...ck.org, Jeff Moyer <jmoyer@...hat.com>,
        Alexander Viro <viro@...iv.linux.org.uk>, luto@...nel.org,
        linux-fsdevel@...r.kernel.org,
        Ross Zwisler <ross.zwisler@...ux.intel.com>,
        Christoph Hellwig <hch@....de>
Subject: Re: [PATCH v6 4/5] fs, xfs: introduce MAP_DIRECT for creating
        block-map-atomic file ranges

I still can't make any sense of this description.  What is an external
agent?  Userspace obviously can't ever see a change in the extent
map, so it can't be meant.

It would help a lot if you could come up with a concrete user for this,
including example code.