From 9c5d9ae37681183d1f22161694629da8a0f3ec88 Mon Sep 17 00:00:00 2001
From: Harshavardhana <harsha@minio.io>
Date: Wed, 17 Nov 2021 15:48:47 -0800
Subject: [PATCH] fallback O_DIRECT if not supported, do regular reads()
 (#13680)

---
 internal/ioutil/read_file.go | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/internal/ioutil/read_file.go b/internal/ioutil/read_file.go
index 1a5f6d20a..e7cc7c3e3 100644
--- a/internal/ioutil/read_file.go
+++ b/internal/ioutil/read_file.go
@@ -19,6 +19,7 @@ package ioutil
 
 import (
 	"io"
+	"os"
 
 	"github.com/minio/minio/internal/disk"
 )
@@ -32,7 +33,12 @@ import (
 func ReadFile(name string) ([]byte, error) {
 	f, err := disk.OpenFileDirectIO(name, readMode, 0666)
 	if err != nil {
-		return nil, err
+		// fallback if there is an error to read
+		// 'name' with O_DIRECT
+		f, err = os.OpenFile(name, readMode, 0666)
+		if err != nil {
+			return nil, err
+		}
 	}
 	r := &ODirectReader{
 		File:      f,