Provide -o vers= support for mount_nfs.

Our mount_nfs does use -o nfsv<2|3|4> or -2 or -3 to specify the version.
OSX (these days), Solaris, and Linux use -o vers=<2,3,4>.

With the upcoming autofs support we can make a lot of (entrerprisy) setups
getting mount options from LDAP just work by providing -o vers= compatibility.

PR:		192379
Reviewed by:	wblock, bjk (man page), rmacklem, emaste
MFC after:	3 days
Sponsored by:	DARPA,AFRL

1 files changed, 29 insertions, 1 deletions

diff --git a/sbin/mount_nfs/mount_nfs.8 b/sbin/mount_nfs/mount_nfs.8
index da11c29..124ba7d 100644
--- a/sbin/mount_nfs/mount_nfs.8
+++ b/sbin/mount_nfs/mount_nfs.8
@@ -28,7 +28,7 @@
 .\"	@(#)mount_nfs.8	8.3 (Berkeley) 3/29/95
 .\" $FreeBSD$
 .\"
-.Dd December 7, 2013
+.Dd August 5, 2014
 .Dt MOUNT_NFS 8
 .Os
 .Sh NAME
@@ -371,6 +371,14 @@ tune the timeout
 interval.)
 .It Cm udp
 Use UDP transport.
+.It Cm vers Ns = Ns Aq Ar vers_number
+Use the specified version number for NFS requests.
+See the
+.Cm nfsv2 ,
+.Cm nfsv3 ,
+and 
+.Cm nfsv4
+options for details.
 .It Cm wcommitsize Ns = Ns Aq Ar value
 Set the maximum pending write commit size to the specified value.
 This determines the maximum amount of pending write data that the NFS
@@ -466,6 +474,26 @@ Same as
 Same as
 .Fl o Cm retrans Ns = Ns Aq Ar value
 .El
+.Pp
+The following
+.Fl o
+named options are equivalent to other
+.Fl o
+named options and are supported for compatibility with other
+operating systems (e.g., Linux, Solaris, and OSX) to ease usage of
+.Xr autofs 5
+support.
+.Bl -tag -width indent
+.It Fl o Cm vers Ns = Ns 2
+Same as
+.Fl o Cm nfsv2
+.It Fl o Cm vers Ns = Ns 3
+Same as
+.Fl o Cm nfsv3
+.It Fl o Cm vers Ns = Ns 4
+Same as
+.Fl o Cm nfsv4
+.El
 .Sh SEE ALSO
 .Xr nmount 2 ,
 .Xr unmount 2 ,