K 10
svn:author
V 5
dougm
K 8
svn:date
V 27
2019-11-17T18:38:37.326508Z
K 7
svn:log
V 192
Add a helper function for testing a swap block and freeing it if empty.

Submitted by: ota_j.email.ne.jp
Approved by: alc, kib, dougm
Differential Revision: https://reviews.freebsd.org/D22402

END