From 0b4c359a638ced910650a2589067cd2fc7cb849d Mon Sep 17 00:00:00 2001
From: Joe Thornber <ejt@redhat.com>
Date: Fri, 26 Apr 2013 13:18:24 +0100
Subject: [PATCH] [block manager] The dirty flag for blocks was never being
 cleared, causes redundant writes.

---
 persistent-data/block.tcc | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/persistent-data/block.tcc b/persistent-data/block.tcc
index 7db9b3a..cc46ff6 100644
--- a/persistent-data/block.tcc
+++ b/persistent-data/block.tcc
@@ -231,6 +231,7 @@ block_manager<BlockSize>::block::flush()
 	if (dirty_) {
 		validator_->prepare(*data_, location_);
 		io_->write_buffer(location_, *data_);
+		dirty_ = false;
 	}
 }
 
@@ -341,6 +342,9 @@ block_manager<BlockSize>::read_lock(block_address location,
 
 		if (cached_block) {
 			(*cached_block)->check_read_lockable();
+
+			// FIXME: a different validator may now be set.
+
 			return read_ref(*this, *cached_block);
 		}