linux-kernel - Re: [dm-devel] [PATCH 3/6] sd: implement the Persistent Reservation API

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Message-ID: <20151015153227.GA3536@lst.de>
Date:	Thu, 15 Oct 2015 17:32:27 +0200
From:	Christoph Hellwig <hch@....de>
To:	Bart Van Assche <bart.vanassche@...disk.com>
Cc:	device-mapper development <dm-devel@...hat.com>, axboe@...com,
	linux-scsi@...r.kernel.org, linux-api@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-nvme@...ts.infradead.org,
	keith.busch@...el.com
Subject: Re: [dm-devel] [PATCH 3/6] sd: implement the Persistent
	Reservation API

On Thu, Oct 15, 2015 at 08:30:50AM -0700, Bart Van Assche wrote:
> Can you explain why this functionality has been added to the sd driver 
> instead of the SCSI core ? Aren't persistent reservations a concept that 
> applies to all SCSI device types ?

In theory it does.  In practice it's only used by disks/arrays and tapes,
and as tapes don't have a struct block_device this isn't going to be useful
for them.
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