K 10
svn:author
V 3
mjg
K 8
svn:date
V 27
2020-08-07T19:36:08.445438Z
K 7
svn:log
V 178
vfs: release the interlock after failing to set VHOLD_NO_SMR

While here add more comments.

Diagnosed by:	markj
Reported by:	pho
Fixes:	r362827 ("vfs: protect vnodes with smr")

END