Re: async discard support

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On Mon, May 02, 2016 at 05:29:50PM -0400, Mike Snitzer wrote:
> Do you have a pointer to either the NVMe or XFS code that is making
> use of this new interface?

I've just uploaded the XFS code here:

http://git.infradead.org/users/hch/vfs.git/commitdiff/512f5ec1bc7428e75e14f3ba1f50844ead40b557

I can't push the whole NVMe target code out, as it implements the
still under NDA fabrics code, but the scheme is exactly the same
as the XFS code above.

> I've been carrying __blkdev_issue_discard_async() in
> drivers/md/dm-thin.c for a while and will clean that up now.  But that
> dm-thin.c code is similar but different from your
> __blkdev_issue_discard().  I'd just like to make sure dm-thin.c falls
> in line as it should.

I think it's basically a subset of __blkdev_issue_discard, so it
should be trivial to convert over.

> For instance I need to get rid of the
> bio_inc_remaining() duplication that is
> dm-thin.c:__bio_inc_remaining().

That seems unrelated to the actual async discard, and more about an
additional bio_end from somewhere inside the DM code.
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