Re: [PATCH 1/1] [RFC] 64bit copy_file_range system call

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On Sat, Jun 17, 2017 at 08:42:54AM -0400, Olga Kornievskaia wrote:
> 
> > 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()

Please re-read the above sentence.  I'm talking about NFS clone and
IOC_CLONE_RANGE, not copy_file_range.  copy_file_range had to follow
the NFS semantics that don't have the special 0 case.
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