nvme reservation commands during controller reset

[Keith Busch]

On Fri, Aug 14, 2020 at 11:09:11AM +0100, Christoph Hellwig wrote:
> Amit,
> 
> can you try the branch below?  Pretty much hot off the press, but I
> think this should address your problem:
> 
> http://git.infradead.org/users/hch/misc.git/shortlog/refs/heads/nvme-pr-fix

Couldn't you just clear the REQ_DRIVER_FAILFAST flag to get the existing
retry mechanisms working in this path?

And while it looks fine for fabrics, PCIe doesn't have the implied HOST
ID connection that makes reservations do the right thing across
different paths. Automatic path failover retries for PCIe may have the
wrong result.