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Chunwei Chen
040dab9939
When doing recv and rollback, dsl_dataset_clone_swap_sync_impl will be called to swap out the ds_objset and do dmu_objset_evict on the old one. However, currently zv->zv_objset will not be swapped out accordingly, so if anyone currently holds a fd on the zvol, we risk hitting a use-after-free. We fix this by introducing the suspend and resume mechanism of zsb to zv. Before recv or rollback, we use zvol_suspend to block all access to zv_objset and shut it down. After the recv or rollback, we use zvol_resume to swap in zv_objset with the new ds_objset and unblock the access. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Chunwei Chen <david.chen@osnexus.com> Closes #4866 Closes #5609
ZFS on Linux, which is also known as ZoL, is currently feature complete. It includes fully functional and stable SPA, DMU, ZVOL, and ZPL layers. And it's native!
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