From: Christoph Hellwig <hch@infradead.org>
To: Bart Van Assche <bvanassche@acm.org>
Cc: Keith Busch <kbusch@meta.com>,
linux-block@vger.kernel.org, linux-nvme@lists.infradead.org,
Keith Busch <kbusch@kernel.org>
Subject: Re: [PATCH 0/5] block: another block copy offload
Date: Fri, 23 May 2025 05:53:04 -0700 [thread overview]
Message-ID: <aDBvsMYTqoRnxa0f@infradead.org> (raw)
In-Reply-To: <2243538c-ca19-4576-af94-ed6e1790c82d@acm.org>
On Thu, May 22, 2025 at 08:52:19AM -0700, Bart Van Assche wrote:
> Before any copy offloading code is merged in the upstream kernel, a plan
> should be presented for how this partial implementation will evolve into
> a generic solution. As Hannes already pointed out, support for
> copying between block devices is missing. SCSI support is missing.
> Device mapper support is missing. What is the plan for evolving this
> patch series into a generic solution? Is it even possible to evolve this
> patch series into a generic solution?
While I agree with some of this, please keep cross-device copies
out of the picture here. The cross-namepace copies and cross LUN
copies in SCSI are a horrible misfeature that is almost impossible
to implement in an I/O stack. If someone ever manages to get them
to work they most certainly would have to use a very different
infrastructure outside the block layer.
next prev parent reply other threads:[~2025-05-23 12:53 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-05-21 22:31 [PATCH 0/5] block: another block copy offload Keith Busch
2025-05-21 22:31 ` [PATCH 1/5] block: new sector copy api Keith Busch
2025-05-22 10:02 ` Hannes Reinecke
2025-05-22 16:43 ` Keith Busch
2025-05-22 19:22 ` Bart Van Assche
2025-05-22 20:04 ` Keith Busch
2025-05-23 12:45 ` Christoph Hellwig
2025-05-23 17:02 ` Keith Busch
2025-05-26 5:18 ` Christoph Hellwig
2025-05-27 17:45 ` Keith Busch
2025-05-28 7:46 ` Christoph Hellwig
2025-05-28 22:41 ` Keith Busch
2025-06-02 4:58 ` Christoph Hellwig
2025-05-21 22:31 ` [PATCH 2/5] block: add support for copy offload Keith Busch
2025-05-22 10:04 ` kernel test robot
2025-05-22 13:49 ` Hannes Reinecke
2025-05-23 12:46 ` Christoph Hellwig
2025-05-23 13:26 ` Keith Busch
2025-05-23 13:37 ` Christoph Hellwig
2025-05-23 13:48 ` Keith Busch
2025-05-26 5:22 ` Christoph Hellwig
2025-05-27 21:33 ` Keith Busch
2025-05-28 7:47 ` Christoph Hellwig
2025-05-21 22:31 ` [PATCH 3/5] nvme: " Keith Busch
2025-05-22 0:47 ` Caleb Sander Mateos
2025-05-22 0:51 ` Caleb Sander Mateos
2025-05-22 3:23 ` Keith Busch
2025-05-22 3:41 ` Caleb Sander Mateos
2025-05-22 4:29 ` Keith Busch
2025-05-22 14:16 ` Caleb Sander Mateos
2025-05-23 12:49 ` Christoph Hellwig
2025-05-23 12:48 ` Christoph Hellwig
2025-05-22 13:54 ` Hannes Reinecke
2025-05-23 12:50 ` Christoph Hellwig
2025-05-23 14:22 ` Caleb Sander Mateos
2025-06-09 9:29 ` Niklas Cassel
2025-05-21 22:31 ` [PATCH 4/5] block: add support for vectored copies Keith Busch
2025-05-22 9:33 ` kernel test robot
2025-05-22 13:58 ` Hannes Reinecke
2025-05-22 16:36 ` Keith Busch
2025-05-21 22:31 ` [PATCH 5/5] nvmet: implement copy support for bdev backed target Keith Busch
2025-05-22 12:51 ` kernel test robot
2025-05-22 13:59 ` Hannes Reinecke
2025-05-23 13:18 ` Christoph Hellwig
2025-05-23 14:00 ` Keith Busch
2025-05-23 14:02 ` Christoph Hellwig
2025-05-22 15:52 ` [PATCH 0/5] block: another block copy offload Bart Van Assche
2025-05-23 12:53 ` Christoph Hellwig [this message]
2025-07-03 14:47 ` Niklas Cassel
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