From: Mi Jinlong <mijinlong@cn.fujitsu.com>
Date: Sat, 30 Oct 2010 02:19:33 +0000 (+0800)
Subject: nfs: kernel should return EPROTONOSUPPORT when not support NFSv4
X-Git-Tag: v2.6.37-rc6~34^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0de1b7e800188782973598158e0acbb9e08e6c99;p=pandora-kernel.git

nfs: kernel should return EPROTONOSUPPORT when not support NFSv4

  When nfs client(kernel) don't support NFSv4, maybe user build
  kernel without NFSv4, there is a problem.

  Using command "mount SERVER-IP:/nfsv3 /mnt/" to mount NFSv3
  filesystem, mount should should success, but fail and get error:

    "mount.nfs: an incorrect mount option was specified"

  System call mount "nfs"(not "nfs4") with "vers=4",
  if CONFIG_NFS_V4 is not defined, the "vers=4" will be parsed
  as invalid argument and kernel return EINVAL to nfs-utils.

  About that, we really want get EPROTONOSUPPORT rather than
  EINVAL. This path make sure kernel parses argument success,
  and return EPROTONOSUPPORT at nfs_validate_mount_data().

Signed-off-by: Mi Jinlong <mijinlong@cn.fujitsu.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
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