On Wed, Aug 26, 2015 at 09:21:54AM -0700, Darrick J. Wong wrote:
> On Wed, Aug 26, 2015 at 03:37:23PM +0200, David Sterba wrote:
> > On Wed, Aug 26, 2015 at 04:16:42PM +0800, Peng Tao wrote:
> > > +struct file_clone_range {
> > > + __s64 src_fd;
> > > + __u64 src_offset;
> > > + __u64 src_length;
> > > + __u64 dest_offset;
> > > +};
> >
> > Might be a good idea to add some spare bytes to the structure.
>
> But... structure size is encoded in the ioctl definition, so adding bytes
> to struct file_clone_range now will change the ioctl number and break
> userland.
Oh right, I somehow did not left idea of a new ioctl definition while
writing it.
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