Konstantin Belousov 29d03af1e4 Do not busy the UFS mount point inside VOP_RENAME(). The
kern_renameat() already starts write on the mp, which prevents
parallel unmount from proceed.  Busying mp after vn_start_write()
deadlocks the unmount.

Reported and tested by:	pho
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
2014-08-20 08:15:23 +00:00
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