K 10
svn:author
V 3
mjg
K 8
svn:date
V 27
2020-12-10T17:17:22.939143Z
K 7
svn:log
V 395
fd: make serialization in fdescfree_fds conditional on hold count

p_fd nullification in fdescfree serializes against new threads transitioning
the count 1 -> 2, meaning that fdescfree_fds observing the count of 1 can
safely assume there is nobody else using the table. Losing the race and
observing > 1 is harmless.

Reviewed by:	markj
Differential Revision:	https://reviews.freebsd.org/D27522

END