NFSv4: Dont list system.nfs4_acl for filesystems that don't support it.

Thanks to Frank Filz for pointing out that we list system.nfs4_acl extended
attribute even on filesystems where we don't actually support nfs4_acl.
This is inconsistent with the e.g. ext3 POSIX ACL behaviour, and seems to
annoy cp.

Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 4aba15ad1d27..47ece1dd3c67 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -3559,6 +3559,8 @@ ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
 {
         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
 
+        if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
+                return 0;
         if (buf && buflen < len)
                 return -ERANGE;
         if (buf)