CIFS: Move echo code to osp struct

Signed-off-by: NPavel Shilovsky <pshilovsky@samba.org>
Signed-off-by: NSteve French <smfrench@gmail.com>

fs/cifs/cifsglob.h

@@ -234,6 +234,10 @@ struct smb_version_operations {
 	/* build a full path to the root of the mount */
 	char * (*build_path_to_root)(struct smb_vol *, struct cifs_sb_info *,
 				     struct cifs_tcon *);
+	/* check if we can send an echo or nor */
+	bool (*can_echo)(struct TCP_Server_Info *);
+	/* send echo request */
+	int (*echo)(struct TCP_Server_Info *);
 };
 
 struct smb_version_values {

fs/cifs/connect.c

@@ -406,15 +406,17 @@ cifs_echo_request(struct work_struct *work)
 					struct TCP_Server_Info, echo.work);
 
 	/*
-	 * We cannot send an echo until the NEGOTIATE_PROTOCOL request is
-	 * done, which is indicated by maxBuf != 0. Also, no need to ping if
-	 * we got a response recently
+	 * We cannot send an echo if it is disabled or until the
+	 * NEGOTIATE_PROTOCOL request is done, which is indicated by
+	 * server->ops->need_neg() == true. Also, no need to ping if
+	 * we got a response recently.
 	 */
 	if (!server->ops->need_neg || server->ops->need_neg(server) ||
+	    (server->ops->can_echo && !server->ops->can_echo(server)) ||
 	    time_before(jiffies, server->lstrp + SMB_ECHO_INTERVAL - HZ))
 		goto requeue_echo;
 
-	rc = CIFSSMBEcho(server);
+	rc = server->ops->echo ? server->ops->echo(server) : -ENOSYS;
 	if (rc)
 		cFYI(1, "Unable to send echo request to server: %s",
 			server->hostname);

fs/cifs/smb1ops.c

@@ -551,6 +551,7 @@ struct smb_version_operations smb1_operations = {
 	.query_path_info = cifs_query_path_info,
 	.get_srv_inum = cifs_get_srv_inum,
 	.build_path_to_root = cifs_build_path_to_root,
+	.echo = CIFSSMBEcho,
 };
 
 struct smb_version_values smb1_values = {