Re: [RFC PATCH 1/2] mm: introduce bmap_walk()

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On Fri, Jun 16, 2017 at 10:22 PM, Christoph Hellwig <hch@xxxxxx> wrote:
> 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.

Certainly you're not saying that existing swapfiles are broken, so I
wonder what bugs you're talking about?

Unless you had plans to go remove bmap() I don't see how this gets in
your way at all. That said, I think "please don't add a new bmap()
user, use iomap instead" is a fair comment. You know me well enough to
know that would be all it takes to redirect my work, I can do without
the bluster.

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