From: Chuck Lever <chuck.lever@oracle.com>
Date: Wed, 13 Feb 2008 19:55:17 +0000 (-0500)
Subject: NFS: Allow text-based mounts via compat_sys_mount
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=4267c9561d9c3bb2abf45abed9c75a1c892d7d15;p=linux-beck.git

NFS: Allow text-based mounts via compat_sys_mount

The compat_sys_mount() system call throws EINVAL for text-based NFSv4
mounts.

The text-based mount interface assumes that any mount option blob that
doesn't set the version field to "1" is a C string (ie not a legacy
mount request).  The compat_sys_mount() call treats blobs that don't
set the version field to "1" as an error.  We just relax the check in
compat_sys_mount() a bit to allow C strings to be passed down to the NFSv4
client.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
---

diff --git a/fs/compat.c b/fs/compat.c
index ee80ff341d37..439292aa1ec6 100644
--- a/fs/compat.c
+++ b/fs/compat.c
@@ -702,9 +702,6 @@ static int do_nfs4_super_data_conv(void *raw_data)
 		real->flags = raw->flags;
 		real->version = raw->version;
 	}
-	else {
-		return -EINVAL;
-	}
 
 	return 0;
 }