On Thu, 2013-02-21 at 21:00 +0100, Paolo Bonzini wrote: > Il 21/02/2013 15:57, Ric Wheeler ha scritto: > >>> > >> sendfile64() pretty much already has the right arguments for a > >> "copyfile", however it would be nice to add a 'flags' parameter: the > >> NFSv4.2 version would use that to specify whether or not to copy file > >> metadata. > > > > That would seem to be enough to me and has the advantage that it is an > > relatively obvious extension to something that is at least not totally > > unknown to developers. > > > > Do we need more than that for non-NFS paths I wonder? What does reflink > > need or the SCSI mechanism? > > For virt we would like to be able to specify arbitrary block ranges. > Copying an entire file helps some copy operations like storage > migration. However, it is not enough to convert the guest's offloaded > copies to host-side offloaded copies. So how would a system call based on sendfile64() plus my flag parameter prevent an underlying implementation from meeting your criterion? -- Trond Myklebust Linux NFS client maintainer NetApp Trond.Myklebust@xxxxxxxxxx www.netapp.com -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
