K 10
svn:author
V 3
mjg
K 8
svn:date
V 27
2020-03-08T00:23:36.750832Z
K 7
svn:log
V 279
fd: use smr for managing struct pwd

This has a side effect of eliminating filedesc slock/sunlock during path
lookup, which in turn removes contention vs concurrent modifications to the fd
table.

Reviewed by:	markj, kib
Differential Revision:	https://reviews.freebsd.org/D23889

END