linux-kernel - Re: [PATCH v5 1/6] nvme: move ns id info to struct nvme_ns

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Date:   Wed, 13 Dec 2023 15:54:25 +0100
From:   Daniel Wagner <dwagner@...e.de>
To:     Sagi Grimberg <sagi@...mberg.me>
Cc:     linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Keith Busch <kbusch@...nel.org>,
        Christoph Hellwig <hch@....de>, Hannes Reinecke <hare@...e.de>
Subject: Re: [PATCH v5 1/6] nvme: move ns id info to struct nvme_ns_head

On Wed, Dec 13, 2023 at 03:27:12PM +0200, Sagi Grimberg wrote:
> > @@ -841,7 +841,7 @@ static void nvme_set_ref_tag(struct nvme_ns *ns, struct nvme_command *cmnd,
> >   	u64 ref48;
> >   	/* both rw and write zeroes share the same reftag format */
> > -	switch (ns->guard_type) {
> > +	switch (ns->head->guard_type) {
> 
> I think that the whole PI stuff needs to be taken with a bit more
> consideration because if not all paths agree on the pi (as we have
> hbas with fabrics) we can't just override or do a logical or on
> the capabilities/attributes.

So should the PI variables stay in nvme_ns at this point? Or should I
add some checks which avoid an override and warn in this case?