[CIFS] Fix oops in cifs_create when nfsd server exports cifs mount

nfsd is passing null nameidata (probably the only one doing that)
on call to create - cifs was missing one check for this.

Note that running nfsd over a cifs mount requires specifying fsid on
the nfs exports entry and requires mounting cifs with serverino mount
option.

Signed-off-by: Steve French <sfrench@us.ibm.com>

1 files changed, 7 insertions, 4 deletions

diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index 17ed7cf750af..40f35f0263ac 100644
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -114,10 +114,6 @@ cifs_read_super(struct super_block *sb, void *data,
 
         sb->s_magic = CIFS_MAGIC_NUMBER;
         sb->s_op = &cifs_super_ops;
-#ifdef CONFIG_CIFS_EXPERIMENTAL
-        if (experimEnabled != 0)
-                sb->s_export_op = &cifs_export_ops;
-#endif /* EXPERIMENTAL */
 /*      if (cifs_sb->tcon->ses->server->maxBuf > MAX_CIFS_HDR_SIZE + 512)
             sb->s_blocksize =
                 cifs_sb->tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE; */
@@ -139,6 +135,13 @@ cifs_read_super(struct super_block *sb, void *data,
                 rc = -ENOMEM;
                 goto out_no_root;
         }
+        
+#ifdef CONFIG_CIFS_EXPERIMENTAL
+        if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
+                cFYI(1, ("export ops supported"));
+                sb->s_export_op = &cifs_export_ops;
+        }
+#endif /* EXPERIMENTAL */
 
         return 0;