On Apr 16, 2011, at 1:11 AM, Andreas Dilger wrote: > In that case, it means cp should just always use FIEMAP_FLAG_SYNC, which is > fine.
Except that if someone is copying a large delay allocated file, it will cause the file to immediately snapped to disk, which might not be the greatest thing in the world. Christoph is write, SEEK_HOLE and SEEK_DATA are a much better API for what cp woulld lke to do. Unfortunately it hasn't been implemented yet in the VFS... - Ted
