issuing flush to all namespaces

[Klaus Jensen]

On Jul 14 10:11, Christoph Hellwig wrote:
> On Thu, Jul 14, 2022 at 10:08:41AM +0200, Klaus Jensen wrote:
> > Hi,
> > 
> > Since the (very reasonable) changes that cause the driver to check that
> > the nsid of the command corresponds to the nsid of the namespace being
> > targeted it is no longer possible to issue a flush to all namespaces:
> > 
> >    # nvme flush /dev/nvme0n1 -n 0xffffffff
> >    flush: Invalid argument
> > 
> > Now, I think we can all agree that Flush is the odd one out here, but
> > can we do anything about it? The char devices also check the nsid, so
> > they can't be used either.
> 
> Don't do it.  Sending flush to all namespaces wasn't even clearly
> defined until I think NVMe 1.4 with the supported bits.  It doesn't
> really make much sense and there is no point in supporting it in Linux.

Alright, I hear you :) Thanks!
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