From 764f5db512fb41b188871b3a1b730a3cb4191b95 Mon Sep 17 00:00:00 2001
From: Matt Joiner <anacrolix@gmail.com>
Date: Tue, 16 Jun 2015 16:54:12 +1000
Subject: [PATCH] Make readahead always at least 2 blocks.

---
 client.go | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/client.go b/client.go
index 2d6bbab5..1f119900 100644
--- a/client.go
+++ b/client.go
@@ -275,8 +275,12 @@ again:
 
 // Calculates the number of pieces to set to Readahead priority, after the
 // Now, and Next pieces.
-func readaheadPieces(readahead, pieceLength int64) int {
-	return int((readahead+pieceLength-1)/pieceLength - 1)
+func readaheadPieces(readahead, pieceLength int64) (ret int) {
+	ret = int((readahead+pieceLength-1)/pieceLength - 1)
+	if ret < 2 {
+		ret = 2
+	}
+	return
 }
 
 func (cl *Client) readRaisePiecePriorities(t *torrent, off, readaheadBytes int64) {