Messages in this thread | | | Date | Tue, 5 Aug 2014 18:45:47 -0400 (EDT) | From | Mikulas Patocka <> | Subject | Re: [PATCH 1/15] block copy: initial XCOPY offload support |
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On Mon, 4 Aug 2014, Pavel Machek wrote:
> 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
It is interesting idea, but it would be far from simple. You could make sendfile (or maybe splice) use XCOPY, but it needs to interact with page cache.
Mikulas
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