From mboxrd@z Thu Jan  1 00:00:00 1970
From: haichuang xing <foxgoblin@gmail.com>
Subject: the kernel 2.4 can not mount kernel 2.6 nfs exports.
Date: Thu, 31 Mar 2005 10:14:30 +0800
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in kernel 2.6 server:
/etc/exports:
/home/webadm/htdocs *(ro,all_squash)

in kernel 2.4 server:
#mount -t nfs -o ro nfsserver:/home/webadm/htdocs /mnt/nfs

i get:
mount: wrong fs type, bad option, bad superblock on
nfsserver:/home/webadm/htdocs, or too many mounted file systems

use strace:

strace mount -t nfs -o ro nfsserver:/home/webadm/htdocs /mnt/nfs

i found:

mount("nfsserver:/home/webadm/htdocs", "/mnt/nfs", "nfs",
MS_RDONLY|0xc0ed0000, 0x80598e0) = -1 EINVAL (Invalid argument)

why?

sorry for my poor english.