From: Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org>
To: Bart Van Assche <bart.vanassche-XdAiOPVOjttBDgjK7y7TUQ@public.gmane.org>
Cc: device-mapper development
<dm-devel-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
axboe-b10kYP2dOMg@public.gmane.org,
linux-scsi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-nvme-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
keith.busch-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org
Subject: Re: [dm-devel] [PATCH 3/6] sd: implement the Persistent Reservation API
Date: Thu, 15 Oct 2015 17:32:27 +0200 [thread overview]
Message-ID: <20151015153227.GA3536@lst.de> (raw)
In-Reply-To: <561FC6AA.3080508-XdAiOPVOjttBDgjK7y7TUQ@public.gmane.org>
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.
WARNING: multiple messages have this Message-ID (diff)
From: hch@lst.de (Christoph Hellwig)
Subject: [dm-devel] [PATCH 3/6] sd: implement the Persistent Reservation API
Date: Thu, 15 Oct 2015 17:32:27 +0200 [thread overview]
Message-ID: <20151015153227.GA3536@lst.de> (raw)
In-Reply-To: <561FC6AA.3080508@sandisk.com>
On Thu, Oct 15, 2015@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.
WARNING: multiple messages have this Message-ID (diff)
From: Christoph Hellwig <hch@lst.de>
To: Bart Van Assche <bart.vanassche@sandisk.com>
Cc: device-mapper development <dm-devel@redhat.com>,
axboe@fb.com, linux-scsi@vger.kernel.org,
linux-api@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-nvme@lists.infradead.org, keith.busch@intel.com
Subject: Re: [dm-devel] [PATCH 3/6] sd: implement the Persistent Reservation API
Date: Thu, 15 Oct 2015 17:32:27 +0200 [thread overview]
Message-ID: <20151015153227.GA3536@lst.de> (raw)
In-Reply-To: <561FC6AA.3080508@sandisk.com>
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.
next prev parent reply other threads:[~2015-10-15 15:32 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-15 12:10 Persistent Reservation API V4 Christoph Hellwig
2015-10-15 12:10 ` Christoph Hellwig
2015-10-15 12:10 ` [PATCH 1/6] block: cleanup blkdev_ioctl Christoph Hellwig
2015-10-15 12:10 ` Christoph Hellwig
2015-10-15 12:10 ` Christoph Hellwig
2015-10-15 12:10 ` [PATCH 2/6] block: add an API for Persistent Reservations Christoph Hellwig
2015-10-15 12:10 ` Christoph Hellwig
2015-10-15 12:10 ` Christoph Hellwig
2015-10-15 12:10 ` [PATCH 3/6] sd: implement the Persistent Reservation API Christoph Hellwig
2015-10-15 12:10 ` Christoph Hellwig
2015-10-15 12:10 ` Christoph Hellwig
2015-10-15 15:30 ` [dm-devel] " Bart Van Assche
2015-10-15 15:30 ` Bart Van Assche
2015-10-15 15:30 ` Bart Van Assche
[not found] ` <561FC6AA.3080508-XdAiOPVOjttBDgjK7y7TUQ@public.gmane.org>
2015-10-15 15:32 ` Christoph Hellwig [this message]
2015-10-15 15:32 ` Christoph Hellwig
2015-10-15 15:32 ` Christoph Hellwig
2015-10-15 12:10 ` [PATCH 4/6] dm: refactor ioctl handling Christoph Hellwig
2015-10-15 12:10 ` Christoph Hellwig
2015-10-15 12:10 ` [PATCH 5/6] dm: add support for passing through persistent reservations Christoph Hellwig
2015-10-15 12:10 ` Christoph Hellwig
2015-10-15 12:10 ` [PATCH 6/6] NVMe: Add persistent reservation ops Christoph Hellwig
2015-10-15 12:10 ` Christoph Hellwig
[not found] ` <1444911052-9423-1-git-send-email-hch-jcswGhMUV9g@public.gmane.org>
2015-10-28 18:43 ` Persistent Reservation API V4 Mike Snitzer
2015-10-28 18:43 ` Mike Snitzer
2015-10-28 18:43 ` Mike Snitzer
2015-10-28 18:48 ` Mike Snitzer
2015-10-28 18:48 ` Mike Snitzer
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