On Thu, Sep 15, 2016 at 02:01:59PM +0200, Wouter Verhelst wrote: > Yes. There was some discussion on that part, and we decided that setting > the flag doesn't hurt, but the spec also clarifies that using it on READ > does nothing, semantically. > > > The problem is that there are clients in the wild which do set it on > READ, so it's just a matter of "be liberal in what you accept".
Note that FUA on READ in SCSI and NVMe does have a meaning - it requires you to bypass any sort of cache on the target. I think it's an wrong defintion because it mandates implementation details that aren't observable by the initiator, but it's still the spec wording and nbd diverges from it. That's not nessecarily a bad thing, but a caveat to look out for. -- To unsubscribe from this list: send the line "unsubscribe linux-block" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
