From 70705966adb7a055582f76f2ecdb5ce9cd3c8a85 Mon Sep 17 00:00:00 2001
From: Robert Morris
Date: Wed, 9 Aug 2017 06:54:45 -0400
Subject: comment fixes

---
 bio.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

(limited to 'bio.c')

diff --git a/bio.c b/bio.c
index fd3a47c..a61ff72 100644
--- a/bio.c
+++ b/bio.c
@@ -75,9 +75,9 @@ bget(uint dev, uint blockno)
     }
   }
 
-  // Not cached; recycle some unused buffer and clean buffer
-  // "clean" because B_DIRTY and not locked means log.c
-  // hasn't yet committed the changes to the buffer.
+  // Not cached; recycle an unused buffer.
+  // Even if refcnt==0, B_DIRTY indicates a buffer is in use
+  // because log.c has modified it but not yet committed it.
   for(b = bcache.head.prev; b != &bcache.head; b = b->prev){
     if(b->refcnt == 0 && (b->flags & B_DIRTY) == 0) {
       b->dev = dev;
-- 
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