From 88695877f085af475a6ca8a01c2fbb08eb5b15da Mon Sep 17 00:00:00 2001
From: Simon Rettberg
Date: Thu, 29 Aug 2019 14:49:18 +0200
Subject: [SERVER] Use weakref for cache maps

Gets rid of a bunch of locking, especially the hot path in net.c where
clients are requesting data. Many clients unsing the same incomplete
image previously created a bottleneck here.
---
 src/server/reference.h | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'src/server/reference.h')

diff --git a/src/server/reference.h b/src/server/reference.h
index 8883eb1..2a80955 100644
--- a/src/server/reference.h
+++ b/src/server/reference.h
@@ -51,4 +51,9 @@ static inline void ref_put( ref *ref )
 	ref == NULL ? NULL : container_of(ref, dnbd3_uplink_t, reference); \
 })
 
+#define ref_get_cachemap(image) ({ \
+	ref* ref = ref_get( &(image)->ref_cacheMap ); \
+	ref == NULL ? NULL : container_of(ref, dnbd3_cache_map_t, reference); \
+})
+
 #endif
-- 
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