coreutils 8.10 is due soon, and has some (impressive) speedups for copying sparse files on systems that support the FIEMAP ioctl. It seems like Windows already has APIs for determining where the holes are in a sparse file, so given enough time and someone to write the patch, it would be nice to see the fiemap ioctl implemented in cygwin.
http://www.mjmwired.net/kernel/Documentation/filesystems/fiemap.txt -- Eric Blake ebl...@redhat.com +1-801-349-2682 Libvirt virtualization library http://libvirt.org
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