MFC r298931, r298981, r299375:Minor spelling fixes in:sys/dev, sys/sysMany of these have user-visible strings.
MFC r284887:Handle errors from background write of the cylinder group blocks.MFC r284927:Simplify code.Approved by: re (gjb)
MFC r281225:Add B_KVAALLOC and B_UNMAPPED to the buf flag name list.