From: Steve Dickson <steved@redhat.com>
Date: Wed, 6 Jun 2012 18:12:07 +0000 (-0400)
Subject: NFS: Map minor mismatch error to protocol not support error.
X-Git-Tag: firefly_0821_release~3680^2~2604^2~11
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=f25efd851cc8c0f63d74334bc784a437f4df8ee4;p=firefly-linux-kernel-4.4.55.git

NFS: Map minor mismatch error to protocol not support error.

Sservers that only have NFSv4.1 support the
NFS4ERR_MINOR_VERS_MISMATCH error is return on
v4.0 mounts. Mapping that error to EPROTONOSUPPORT
will cause the mount to back off to v3 instead of
failing.

Signed-off-by: Steve Dickson <steved@redhat.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
---

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 7c218fd1ec21..bfc919fd3f06 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -105,6 +105,8 @@ static int nfs4_map_errors(int err)
 		return -EINVAL;
 	case -NFS4ERR_SHARE_DENIED:
 		return -EACCES;
+	case -NFS4ERR_MINOR_VERS_MISMATCH:
+		return -EPROTONOSUPPORT;
 	default:
 		dprintk("%s could not handle NFSv4 error %d\n",
 				__func__, -err);