From 23f78400561e0172a55e1fad8172a848d9cafab6 Mon Sep 17 00:00:00 2001
From: cinap_lenrek <cinap_lenrek@felloff.net>
Date: Sun, 26 Jul 2015 13:55:51 +0200
Subject: [PATCH] devmnt: dont reset readahead window when requested offset
 still has pending rpc

---
 sys/src/9/port/devmnt.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/sys/src/9/port/devmnt.c b/sys/src/9/port/devmnt.c
index 18bea77bd..1fec71ec0 100644
--- a/sys/src/9/port/devmnt.c
+++ b/sys/src/9/port/devmnt.c
@@ -895,7 +895,8 @@ mntrahread(Mntrah *rah, Chan *c, uchar *buf, long len, vlong off)
 		return 0;
 	if(off != rah->off){
 		rah->off = off;
-		rah->seq = 0;
+		if(rahfindrpc(rah, off) == nil)
+			rah->seq = 0;
 	}
 	rah->off += len;
 	rah->seq += len;