[PATCHv3 09/10] blk-integrity: consider entire bio list for merging

[Keith Busch]

On Tue, Sep 10, 2024 at 05:48:43PM +0200, Christoph Hellwig wrote:
> On Wed, Sep 04, 2024 at 08:26:04AM -0700, Keith Busch wrote:
> > From: Keith Busch <kbusch at kernel.org>
> > 
> > If a bio is merged to a req, the entire bio list is merged, so don't
> > temporarily unchain it when counting segments for consideration.
> 
> As far as I can tell we never do merge decisions on bio lists.  If
> bi_next is non-NULL here it probably is due to scheduler lists or
> something like it.

I think bi_next is always NULL, so the unlinking should be a no-op. But
just in case it isn't, the current unlinking will get the wrong segment
count from the resulting merge.