[PATCH] nvmet: Use direct IO for writes

[Christoph Hellwig]

On Wed, Sep 21, 2016 at 11:10:50AM -0700, Sagi Grimberg wrote:
> We're designed to work with high-end devices where
> direct IO makes perfect sense. We noticed that we
> context switch by scheduling kblockd instead of going
> directly to the device without REQ_SYNC for writes.

This looks reasonable.  But I still wonder why we bother to inject delay
for any fast blk-mq device (background: Sagi told me he is observing
issues without this on a NVMe PCIe card backend)