On 15-12-14 08:22 PM, Mikulas Patocka wrote:
On Thu, 10 Dec 2015, Martin K. Petersen wrote:
"Mikulas" == Mikulas Patocka <mpato...@redhat.com> writes:
Mikulas,
Mikulas> This patch series adds copy offload (the XCOPY command) to the
Mikulas> block layer, SCSI subsystems and device mapper.
Now that the VFS stuff appears to stabilize I agree it's a good time to
revisit all this. I just merged the required VPD patches from Hannes so
those will be in 4.5.
I have a bunch of changes to the SCSI code that I worked on over the
spring/summer based on a feedback from the array vendors after
discussions we started at LSF/MM. Generally speaking, their comments
didn't make things easier, nor prettier :( But your two bio approach is
a requirement to accommodate those needs (token-based copy) so I'll work
on consolidating your changes with mine.
Let me know when you make some progress with that.
Is there some software iSCSI implementation that supports token-based
copy? So that I could try to make support for it.
FreeNAS. See:
http://www.freenas.org/
It has the best ODX implementation (thanks to Alexander Motin) that
I have come across for testing my ddpt based ODX client. It also
supports large parts of the more general xcopy LID1 and LID4.
BTW In SPC-5 xcopy LID1 has been dropped and "xcopy" now means
xcopy LID4 (as found in SPC-4).
Doug Gilbert
That said, we still need Mike Christie's patches to go in first.
Mike: What's your status? I'm afraid I didn't get a chance to dig very
deep in your series since it coincided with me scrambling to sort out
SCSI for 4.4. Do you think there's a chance we could get your patches in
shape for 4.5? Is there an up-to-date tree I can look at?
--
Martin K. Petersen Oracle Linux Engineering
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