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16fa68f07d
'zfs recv' could disown a living objset without calling dmu_objset_disown(). This will cause the problem that the objset would be released while the upgrading thread is still running. This patch avoids the problem by checking if a dataset is a snapshot before calling dmu_objset_userobjspace_upgrade(). Snapshots are immutable and therefore it doesn't make sense to update them. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Jinshan Xiong <jinshan.xiong@intel.com> Closes #5295 Closes #5328