Reduce big message RPC allocations (#19390)

Use `ODirectPoolSmall` buffers for inline data in PutObject.

Add a separate call for inline data that will fetch a buffer for the inline data before unmarshal.

cmd/storage-rest-client.go

@@ -468,7 +468,7 @@ func (client *storageRESTClient) CheckParts(ctx context.Context, volume string,
 
 // RenameData - rename source path to destination path atomically, metadata and data file.
 func (client *storageRESTClient) RenameData(ctx context.Context, srcVolume, srcPath string, fi FileInfo, dstVolume, dstPath string, opts RenameOptions) (sign uint64, err error) {
-	resp, err := storageRenameDataRPC.Call(ctx, client.gridConn, &RenameDataHandlerParams{
+	params := RenameDataHandlerParams{
 		DiskID:    client.diskID,
 		SrcVolume: srcVolume,
 		SrcPath:   srcPath,
@@ -476,10 +476,17 @@ func (client *storageRESTClient) RenameData(ctx context.Context, srcVolume, srcP
 		DstVolume: dstVolume,
 		FI:        fi,
 		Opts:      opts,
-	})
+	}
+	var resp *RenameDataResp
+	if fi.Data == nil {
+		resp, err = storageRenameDataRPC.Call(ctx, client.gridConn, &params)
+	} else {
+		resp, err = storageRenameDataInlineRPC.Call(ctx, client.gridConn, &RenameDataInlineHandlerParams{params})
+	}
 	if err != nil {
 		return 0, toStorageErr(err)
 	}
+
 	defer storageRenameDataRPC.PutResponse(resp)
 	return resp.Signature, nil
 }