[dm-devel] [PATCH for-4.2 04/14] block: factor out blkdev_issue_discard_async

[Christoph Hellwig]

On Mon, May 18, 2015 at 03:18:30PM -0400, Mike Snitzer wrote:
> > And besides that generic high level sentiment I think the interface
> > for blkdev_issue_discard_async is simply wrong.  Either you want to keep
> > the internals private and just expose a completion callback that gets
> > your private data and an error, or you want to build your own bios as
> > suggested above.  But not one that is mostly opaque except for allowing
> > the caller to hook into the submission process and thus taking over I/O
> > completion.
> 
> I'll see what I can come up with.

Another option would be to help with reviewing and testing this
series: http://thread.gmane.org/gmane.linux.kernel/1947453

If we can get thast one in the submitter doesn't have to care
about aligning or splitting discard (or any other) bios.