smb3: fix caching of ctime on setxattr

Fixes xfstest generic/728 which had been failing due to incorrect
ctime after setxattr and removexattr

Update ctime on successful set of xattr

Cc: stable@vger.kernel.org
Signed-off-by: Steve French <stfrench@microsoft.com>

fs/smb/client/xattr.c

@@ -150,10 +150,13 @@ static int cifs_xattr_set(const struct xattr_handler *handler,
 		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
 			goto out;
 
-		if (pTcon->ses->server->ops->set_EA)
+		if (pTcon->ses->server->ops->set_EA) {
 			rc = pTcon->ses->server->ops->set_EA(xid, pTcon,
 				full_path, name, value, (__u16)size,
 				cifs_sb->local_nls, cifs_sb);
+			if (rc == 0)
+				inode_set_ctime_current(inode);
+		}
 		break;
 
 	case XATTR_CIFS_ACL: