linux-kernel - Re: [RFC PATCH 1/2] mm: introduce bmap

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Date:   Sat, 17 Jun 2017 07:22:12 +0200
From:   Christoph Hellwig <hch@....de>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     akpm@...ux-foundation.org, Jan Kara <jack@...e.cz>,
        linux-nvdimm@...ts.01.org, linux-api@...r.kernel.org,
        Dave Chinner <david@...morbit.com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Jeff Moyer <jmoyer@...hat.com>, linux-fsdevel@...r.kernel.org,
        Ross Zwisler <ross.zwisler@...ux.intel.com>,
        Christoph Hellwig <hch@....de>
Subject: Re: [RFC PATCH 1/2] mm: introduce bmap_walk()

On Fri, Jun 16, 2017 at 06:15:29PM -0700, Dan Williams wrote:
> Refactor the core of generic_swapfile_activate() into bmap_walk() so
> that it can be used by a new daxfile_activate() helper (to be added).

No way in hell!  generic_swapfile_activate needs to day and no new users
of ->bmap over my dead body.  It's a guaranteed to fuck up your data left,
right and center.