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2021-03-27T21:09:11.858584Z
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V 922
mountd(8): generate a syslog message when the "V4:" line is missing

Daniel reported that NFSv4 mounts were not working despite having
set "nfsv4_server_enable=YES" in /etc/rc.conf.  Mountd was logging a
message that there was no /etc/exports file.
He noted that creating a /etc/exports file with a "V4:" line in it
was needed make NFSv4 mounts work.
At least one "V4:" line in one of the exports(5) file(s) is needed to
make NFSv4 mounts work. This patch fixes mountd.c so that it logs a
message indicting that there is no "V4:" line in any exports(5)
file when NFSv4 mounts are enabled.
To avoid this message being generated erroneously, /etc/rc.d/mountd
is updated to make sure vfs.nfsd.server_max_nfsvers is properly set
before mountd(8) is started.

PR:	253901

(cherry picked from commit 09673fc0f36dd1cca74940a240a9ed0f62228084)

Git Hash:   5cc4e912e031c717e6ee6c2a0fd92137cc2dcefc
Git Author: rmacklem@FreeBSD.org
END