bin/59669: "-o posix1eacls" mount option not mentioned in documentation

[pl%szwajn.net@localhost]

>Number:         59669
>Category:       bin
>Synopsis:       "-o posix1eacls" mount option not mentioned in documentation
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    bin-bug-people
>State:          open
>Class:          doc-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Sep 25 14:05:00 +0000 2025
>Originator:     pl / Hetzer
>Release:        10.1 amd64
>Organization:
none
>Environment:
NetBSD scoutellite.szwajn.net 10.1 NetBSD 10.1 (GENERIC) #0: Mon Dec 16 13:08:11 UTC 2024  mkrepro%mkrepro.NetBSD.org@localhost:/usr/src/sys/arch/amd64/compile/GENERIC amd64
>Description:
There's no mention of "posix1eacls" mount option in any relevant utitities' "usage" or their corresponding manpages. It's required to make ACLs on FFSv2ea actually functional (Otherwise it just throws "Operation not supported")
>How-To-Repeat:
-
>Fix:
Mention this option in appropriate documentation (I think fstab(5), mount_ffs(8), get / setfacl(1)?)