Merge branch 'master' of git+ssh://amsterdam.csail.mit.edu/home/am0/6.828/xv6

1 files changed, 2 insertions, 0 deletions

diff --git a/bio.c b/bio.c
index a6cefc8..916968d 100644
--- a/bio.c
+++ b/bio.c
@@ -80,6 +80,8 @@ bget(uint dev, uint sector)
   }
 
   // Not cached; recycle some non-busy and clean buffer.
+  // "clean" because B_DIRTY and !B_BUSY means log.c
+  // hasn't yet committed the changes to the buffer.
   for(b = bcache.head.prev; b != &bcache.head; b = b->prev){
     if((b->flags & B_BUSY) == 0 && (b->flags & B_DIRTY) == 0){
       b->dev = dev;