Jeremy Allison <jra@xxxxxxxxx> wrote: > On Thu, Feb 21, 2013 at 01:51:53PM +0000, Myklebust, Trond wrote: > > On Thu, 2013-02-21 at 12:37 +0100, 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. > > > > 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. > > What would be really nice is if sendfile allowed zero-copy > from network socket to a file descriptor. That would help > a *lot* of my small system OEMs (and no splice() just doesn't > cut it :-). I've often wish the pipe requirement of splice() could be dropped, to allow copying between arbitrary FDs. Perhaps this can be done? -- 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
