diff --git a/dfanalyzer/main.py b/dfanalyzer/main.py
index d595078..909c6fb 100644
--- a/dfanalyzer/main.py
+++ b/dfanalyzer/main.py
@@ -230,10 +230,22 @@ def io_function(json_object, current_dict, time_approximate,condition_fn):
             d["hostname"] = json_object["args"]["hostname"]
 
         if "POSIX" == json_object["cat"] and "ret" in json_object["args"]:
-            if "write" in json_object["name"]:
+            if json_object["name"] == "write":
                 d["size"] = int(json_object["args"]["ret"])
-            elif "read" in json_object["name"] and "readdir" not in json_object["name"]:
+            elif json_object["name"] == "read":
                 d["size"] = int(json_object["args"]["ret"])
+            elif json_object["name"] == "fwrite":
+                d["size"] = 1
+                if "ret" in json_object["args"]:
+                    d["size"] *= int(json_object["args"]["ret"]) 
+                if "size" in json_object["args"]:
+                    d["size"] *= int(json_object["args"]["size"])
+            elif json_object["name"] == "fread":               
+                d["size"] = 1
+                if "ret" in json_object["args"]:
+                    d["size"] *= int(json_object["args"]["ret"]) 
+                if "size" in json_object["args"]:
+                    d["size"] *= int(json_object["args"]["size"])
         else:
             if "image_size" in json_object["args"]:
                 d["size"] = int(json_object["args"]["image_size"])
diff --git a/src/dftracer/brahma/stdio.cpp b/src/dftracer/brahma/stdio.cpp
index 164d472..7596664 100644
--- a/src/dftracer/brahma/stdio.cpp
+++ b/src/dftracer/brahma/stdio.cpp
@@ -47,6 +47,7 @@ size_t brahma::STDIODFTracer::fread(void *ptr, size_t size, size_t nmemb,
   DFT_LOGGER_UPDATE(size);
   DFT_LOGGER_UPDATE(nmemb);
   size_t ret = __real_fread(ptr, size, nmemb, fp);
+  DFT_LOGGER_UPDATE(ret);
   DFT_LOGGER_END();
   return ret;
 }
@@ -58,6 +59,7 @@ size_t brahma::STDIODFTracer::fwrite(const void *ptr, size_t size, size_t nmemb,
   DFT_LOGGER_UPDATE(size);
   DFT_LOGGER_UPDATE(nmemb);
   size_t ret = __real_fwrite(ptr, size, nmemb, fp);
+  DFT_LOGGER_UPDATE(ret);
   DFT_LOGGER_END();
   return ret;
 }
@@ -66,6 +68,7 @@ long brahma::STDIODFTracer::ftell(FILE *fp) {
   BRAHMA_MAP_OR_FAIL(ftell);
   DFT_LOGGER_START(fp);
   long ret = __real_ftell(fp);
+  DFT_LOGGER_UPDATE(ret);
   DFT_LOGGER_END();
   return ret;
 }
@@ -76,6 +79,7 @@ int brahma::STDIODFTracer::fseek(FILE *fp, long offset, int whence) {
   DFT_LOGGER_UPDATE(offset);
   DFT_LOGGER_UPDATE(whence);
   int ret = __real_fseek(fp, offset, whence);
+  DFT_LOGGER_UPDATE(ret);
   DFT_LOGGER_END();
   return ret;
 }
\ No newline at end of file