K 10
svn:author
V 3
mav
K 8
svn:date
V 27
2018-12-27T18:28:19.175733Z
K 7
svn:log
V 466
Reimplement nvd(4) detach handling.

Previous code typically crashed in case of NVMe device unplug or even clean
detach while some I/Os are still in flight.  To fix this the new code calls
disk_gone() and waits for confirmation of all references gone before calling
disk_destroy(), freeing other resources and allowing controller detach.

While there, fix disk lists locking and reimplement unit numbers assignment.

MFC after:	1 month
Sponsored by:	iXsystems, Inc.

END