> On Jun 17, 2017, at 6:03 AM, Christoph Hellwig <hch@xxxxxxxxxxxxx> wrote: > > On Fri, Jun 16, 2017 at 01:36:30PM -0400, J. Bruce Fields wrote: >> It makes a difference in the clone case, doesn't it? (Though I'd think >> best there would be a special "copy to end of file" value.) > > Clones uses a 0 length as "whole" file. Both for the NFS operation > and the Linux ioctl. Does that actually work? There is check vfs_copy_file_range() if (len == 0) return 0;
