Messages in this thread | | | Date | Thu, 21 Feb 2013 14:37:32 +0100 | From | Hannes Reinecke <> | Subject | Re: New copyfile system call - discuss before LSF? |
| |
On 02/21/2013 12:37 PM, Ric Wheeler wrote: > > We have debated the need to have a system call to allow for > offloading copy operations, for example to an NFS server (part to > the new NFS 4.2 specification), SCSI target device (two different > SCSI commands do this), local file systems (reflink, etc) and I > suspect many other possible parts of the stack could implement this. > > The earliest discussion of such a system call I saw happened back in > 2001, I know we had another more recent flurry (2-3 years back?) as > well that got tangled up and died away. > Yeah, I remember. I talked to Mkp about it, who (as usual :-) had a patchset stashed away for this. Or a preliminary attempt, anyway. However, this was waiting for the DISCARD merging patches to go in, which in turn were waiting for the WRITE SAME patches IIRC.
Or something.
Martin?
> Given the new popularity of this in storage devices and the use case > for virt guests, any chance to get a proposal floated this year that > might be able to land upstream in our life times :) ? > Oh, most definitely. Now that I finally have an array capable of doing ROD token copy we should be reevaluating things.
I see to have the sg_xcopy program updated to do ROD copy, then we will have some real-world data.
Cheers,
Hannes -- Dr. Hannes Reinecke zSeries & Storage hare@suse.de +49 911 74053 688 SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg GF: J. Hawn, J. Guild, F. Imendörffer, HRB 16746 (AG Nürnberg) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |