Bug 22215

Hi, I have a Linux 2.2.18 machine [Redhat 6.2] from which I export /home to
another machine which has Redhat 7.0 with errata installed. The client
machine also has 2.2.18 installed. In both machines, NFS v3 client/server
support were enabled via make menuconfig. Both machines have the latest
nfs-utils from http://nfs.sourceforge.net/

On the RH 6.2 machine 192.168.2.3 which is configured as a NFS server, I
modify /etc/exports to the following

/home 192.168.2.2(rw)

On the RH 7.0 machine [192.168.2.2], I mount the export via the following
command

mount -t nfs -orsize=32768,wsize=32768,nfsvers=3 192.168.2.3:/home /mnt/home

This results in the following message

NFSv3 not supported!
mount: wrong fs type, bad option, bad superblock on 202.77.181.217:/home,
       or too many mounted file systems

I tried using mount-2.10o from Rawhide but it gave the same result

However, If I reverse the roles of the machines, then mount-2.10f on the RH
6.2 box seems to be able to mount a filesystem from the RH 7.0 box as a NFS
v3 mount

According to a message on nfs.net, this is what Trond


     > Confused,

It is 'mount' itself that saying so because it believes your kernel is
too old to support NFSv3. Remember official support for NFSv3 goes in
as of kernel 2.2.18 only.

Try editing the line

        else if (kernel_version < MAKE_VERSION(2,2,18))
                nfs_mount_version = 3;
to read
        else if (kernel_version < MAKE_VERSION(2,2,17))
                nfs_mount_version = 3;

(or whatever) depending on which NFSv3-patched kernel you're using.

This patch also seems to be available at this URL

http://www.fys.uio.no/~trondmy/src/nfsv3-mount/util-linux-2.10o-nfsv3.dif

Request a release of a mount RPM which is capable of mounting NFS v3 mounts
from Linux servers