On Mon, Jul 11, 2016 at 06:31:57PM -0700, David Chen wrote: > Hi Al, > > I'm not sure about the in-tree fs, but in zfsonlinux, it would offload > iput to a thread, so this would happen there. And it would wait for > the thread in put_super(), so that part is not a problem...
*shrug* I hadn't looked (and won't look) at zfs glue, but I'd suggest trying something along the line of stopping that thread in the beginning of your ->kill_sb() (having told the sucker to stop offloading, of course) and only then calling generic_shutdown_super()...
