From 4843affd0eab28e14e89de3f4c9a040d3b2659ca Mon Sep 17 00:00:00 2001
From: Krishna Srinivas <634494+krishnasrinivas@users.noreply.github.com>
Date: Sat, 25 Apr 2020 01:18:54 -0700
Subject: [PATCH] Write files in O_SYNC for fs backend to protect against
 machine crashes (#9434)

---
 cmd/fs-v1-helpers.go          | 2 +-
 pkg/ioutil/append-file_nix.go | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/cmd/fs-v1-helpers.go b/cmd/fs-v1-helpers.go
index a275c08b6..79e27418e 100644
--- a/cmd/fs-v1-helpers.go
+++ b/cmd/fs-v1-helpers.go
@@ -321,7 +321,7 @@ func fsCreateFile(ctx context.Context, filePath string, reader io.Reader, buf []
 		return 0, err
 	}
 
-	writer, err := lock.Open(filePath, os.O_CREATE|os.O_WRONLY, 0666)
+	writer, err := lock.Open(filePath, os.O_CREATE|os.O_WRONLY|os.O_SYNC, 0666)
 	if err != nil {
 		return 0, osErrToFSFileErr(err)
 	}
diff --git a/pkg/ioutil/append-file_nix.go b/pkg/ioutil/append-file_nix.go
index f82367a9f..a5b937fc6 100644
--- a/pkg/ioutil/append-file_nix.go
+++ b/pkg/ioutil/append-file_nix.go
@@ -25,7 +25,7 @@ import (
 
 // AppendFile - appends the file "src" to the file "dst"
 func AppendFile(dst string, src string) error {
-	appendFile, err := os.OpenFile(dst, os.O_WRONLY|os.O_APPEND|os.O_CREATE, 0666)
+	appendFile, err := os.OpenFile(dst, os.O_WRONLY|os.O_APPEND|os.O_CREATE|os.O_SYNC, 0666)
 	if err != nil {
 		return err
 	}