From 398d53e0d66f0cafa143346bf40c6246d904b7e0 Mon Sep 17 00:00:00 2001
From: Joe Thornber <ejt@redhat.com>
Date: Mon, 14 Aug 2017 10:17:56 +0100
Subject: [PATCH] [block-cache] add comment to stop me removing the list sizes
 again.

---
 block-cache/block_cache.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/block-cache/block_cache.h b/block-cache/block_cache.h
index d6cd1c9..33f3fe5 100644
--- a/block-cache/block_cache.h
+++ b/block-cache/block_cache.h
@@ -266,6 +266,9 @@ namespace bcache {
 		block_list dirty_;
 		block_list clean_;
 
+		// Because the block_list type doesn't have a constant time
+		// size() method, we have to manually keep track of the list
+		// sizes (tedious and error prone).
 		unsigned nr_locked_;
 		unsigned nr_dirty_;