From 5b487f651aad9661a6e7d206b7404ebe47c7680a Mon Sep 17 00:00:00 2001
From: Tan Guofu <87045830+tanguofu@users.noreply.github.com>
Date: Sat, 27 May 2023 18:15:47 +0800
Subject: [PATCH] Update curl.cpp:  reduce memory cache use (#2157)

flush the file and clean the page cache when filepart download done
---
 src/curl.cpp | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/curl.cpp b/src/curl.cpp
index a5117b3..2ae9fa8 100644
--- a/src/curl.cpp
+++ b/src/curl.cpp
@@ -703,7 +703,12 @@ size_t S3fsCurl::DownloadWriteCallback(void* ptr, size_t size, size_t nmemb, voi
     }
     pCurl->partdata.startpos += totalwrite;
     pCurl->partdata.size     -= totalwrite;
-
+    
+    // flush the file and clean the page cache
+    if (pCurl->partdata.size == 0){
+        fdatasync(pCurl->partdata.fd);
+    }
+	
     return totalwrite;
 }