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devmnt: dont reset readahead window when requested offset still has pending rpc

--- a/sys/src/9/port/devmnt.c

+++ b/sys/src/9/port/devmnt.c

@@ -895,7 +895,8 @@

 		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;

-- 

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