nvme-5.16-2021-10-21

nvme updates for Linux 5.16

 - fix a multipath partition scanning deadlock (Hannes Reinecke)
 - generate uevent once a multipath namespace is operational again
   (Hannes Reinecke)
 - support unique discovery controller NQNs (Hannes Reinecke)
 - fix use-after-free when a port is removed (Israel Rukshin)
 - clear shadow doorbell memory on resets (Keith Busch)
 - use struct_size (Len Baker)
 - add error handling support for add_disk (Luis Chamberlain)
 - limit the maximal queue size for RDMA controllers (Max Gurtovoy)
 - use a few more symbolic names (Max Gurtovoy)
 - fix error code in nvme_rdma_setup_ctrl (Max Gurtovoy)
 - add support for ->map_queues on FC (Saurav Kashyap)
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