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 -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
