[REVIEW] patch for copyout on ioctl error

[Matthew Ahrens]

On Sun, Apr 7, 2013 at 12:29 PM, Martin Matuska <mm at freebsd.org> wrote:

> zfs_ioctl_version is for future purposes to make it
> easier for the kernel to identify ioctl changes.
>

Is this so that you can support old libzfs.so binaries with a new kernel
module?  Or to detect and fail if an old libzfs is used?  FYI, in illumos
we require that libzfs and the kernel be matched (likewise with other
libraries, e.g. libc).  So you will need to update the ioctl version # when
merging changes from illumos.

--matt