K 10 svn:author V 4 jeff K 8 svn:date V 27 2020-01-21T00:12:57.712793Z K 7 svn:log V 175 Move readahead and dropbehind fault functionality into a helper routine for clarity. Reviewed by: dougm, kib, markj Differential Revision: https://reviews.freebsd.org/D23282 END