linux-kernel - Re: Persistent Reservation API V2

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Message-ID: <20150821065954.GA14559@lst.de>
Date:	Fri, 21 Aug 2015 08:59:54 +0200
From:	Christoph Hellwig <hch@....de>
To:	Keith Busch <keith.busch@...el.com>
Cc:	Jens Axboe <axboe@...com>, linux-api@...r.kernel.org,
	dm-devel@...hat.com, linux-nvme@...ts.infradead.org,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: Persistent Reservation API V2

On Thu, Aug 20, 2015 at 11:56:36PM +0000, Keith Busch wrote:

> NVMe can also specify
> if whether or not a reservation should persist through power-loss.

SCSI does as well, it's the APTPL flag.  However reservations not persistent
through a power loss are basically useless, so I decided to force them on
in the API.  From the documentation:

"All implementations are expected to ensure the reservations survive
 a power loss"

So I would prefer not to add it, or if we really have to as a negative flag
to specifically opt out of the APTPL behavior.

> with it. For example, NVMe can ignore existing keys when acquiring a
> reservation in addition to registering a new key.

This sounds like a sensible addition to me, and I wouldn't be surprised
if future SPC versions will add this flag.
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