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4039 zfs_rename()/zfs_link() needs stronger test for XDEV Reviewed by: Gordon Ross <gordon.ross@nexenta.com> Reviewed by: Kevin Crowe <kevin.crowe@nexenta.com> Reviewed by: Saso Kiselkov <skiselkov.ml@gmail.com> Reviewed by: Matthew Ahrens <mahrens@delphix.com> Approved by: Dan McDonald <danmcd@nexenta.com> References: https://www.illumos.org/issues/4039 https://github.com/illumos/illumos-gate/commit/18e6497 Porting notes: - This check was updated in Linux in a similar fashion early on in the port. Therefore, this patch just reorders the function and updates the comment so it flows the same way as the upstream code. Ported-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #4218