linux-kernel - Re: [PATCH 1/15] block copy: initial XCOPY offload support

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Message-ID: <20140804140925.GA24261@amd.pavel.ucw.cz>
Date:	Mon, 4 Aug 2014 16:09:25 +0200
From:	Pavel Machek <pavel@....cz>
To:	Mikulas Patocka <mpatocka@...hat.com>
Cc:	"Alasdair G. Kergon" <agk@...hat.com>,
	Mike Snitzer <msnitzer@...hat.com>,
	Jonathan Brassow <jbrassow@...hat.com>,
	Edward Thornber <thornber@...hat.com>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Jens Axboe <axboe@...nel.dk>,
	Christoph Hellwig <hch@...radead.org>, dm-devel@...hat.com,
	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org
Subject: Re: [PATCH 1/15] block copy: initial XCOPY offload support

On Tue 2014-07-15 15:34:47, Mikulas Patocka wrote:
> This is Martin Petersen's xcopy patch
> (https://git.kernel.org/cgit/linux/kernel/git/mkp/linux.git/commit/?h=xcopy&id=0bdeed274e16b3038a851552188512071974eea8)
> with some bug fixes, ported to the current kernel.
> 
> This patch makes it possible to use the SCSI XCOPY command.
> 
> We create a bio that has REQ_COPY flag in bi_rw and a bi_copy structure
> that defines the source device. The target device is defined in the
> bi_bdev and bi_iter.bi_sector.
> 
> There is a new BLKCOPY ioctl that makes it possible to use XCOPY from
> userspace. The ioctl argument is a pointer to an array of four uint64_t
> values.

But it is there only for block devices, right?

Is there plan to enable tools such as /bin/cp to use XCOPY?

									Pavel
-- 
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