NFS: also send OFFLOAD_CANCEL to source server

In case of copy is cancelled, also send OFFLOAD_CANCEL to the source
server.
Signed-off-by: Olga Kornievskaia <kolga@netapp.com>

fs/nfs/nfs42proc.c

@@ -206,12 +206,14 @@ static int handle_async_copy(struct nfs42_copy_res *res,
 	memcpy(&res->write_res.verifier, &copy->verf, sizeof(copy->verf));
 	status = -copy->error;
 
+out_free:
 	kfree(copy);
 	return status;
 out_cancel:
 	nfs42_do_offload_cancel_async(dst, &copy->stateid);
-	kfree(copy);
-	return status;
+	if (!nfs42_files_from_same_server(src, dst))
+		nfs42_do_offload_cancel_async(src, src_stateid);
+	goto out_free;
 }
 
 static int process_copy_commit(struct file *dst, loff_t pos_dst,
@@ -381,7 +383,8 @@ ssize_t nfs42_proc_copy(struct file *src, loff_t pos_src,
 
 		if (err >= 0)
 			break;
-		if (err == -ENOTSUPP) {
+		if (err == -ENOTSUPP &&
+				nfs42_files_from_same_server(src, dst)) {
 			err = -EOPNOTSUPP;
 			break;
 		} else if (err == -EAGAIN) {
@@ -392,7 +395,8 @@ ssize_t nfs42_proc_copy(struct file *src, loff_t pos_src,
 			dst_exception.retry = 1;
 			continue;
 		} else if ((err == -ESTALE ||
-				err == -NFS4ERR_OFFLOAD_DENIED) &&
+				err == -NFS4ERR_OFFLOAD_DENIED ||
+				err == -ENOTSUPP) &&
 				!nfs42_files_from_same_server(src, dst)) {
 			nfs42_do_offload_cancel_async(src, &args.src_stateid);
 			err = -EOPNOTSUPP;