From 9dced9a8903fb45b38f40a3ae1e2cf56ceb2024b Mon Sep 17 00:00:00 2001
From: Diptanu Choudhury <diptanuc@gmail.com>
Date: Wed, 13 Jan 2016 12:43:13 -0800
Subject: [PATCH] alex: making the readat more efficient

---
 client/allocdir/alloc_dir.go | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/client/allocdir/alloc_dir.go b/client/allocdir/alloc_dir.go
index ea5a3d441..03cd0ecb5 100644
--- a/client/allocdir/alloc_dir.go
+++ b/client/allocdir/alloc_dir.go
@@ -255,15 +255,13 @@ func (d *AllocDir) FSStat(path string) (*AllocFile, error) {
 }
 
 func (d *AllocDir) FSReadAt(allocID string, path string, offset int64, limit int64, w io.Writer) error {
-	buf := make([]byte, limit)
 	p := filepath.Join(d.AllocDir, path)
 	f, err := os.Open(p)
 	if err != nil {
 		return err
 	}
-	n, err := f.ReadAt(buf, offset)
-	w.Write(buf[:n])
-	return err
+	io.Copy(w, io.LimitReader(f, limit))
+	return nil
 }
 
 func fileCopy(src, dst string, perm os.FileMode) error {