From 6763084ae53fc0228d50ab94bbbced89c1b14f1c Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <eelco.dolstra@logicblox.com>
Date: Wed, 1 Aug 2012 22:43:03 -0400
Subject: [PATCH] Count bytes freed deleting unused links

---
 src/libstore/gc.cc          | 6 ++++--
 src/libstore/local-store.hh | 2 +-
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/libstore/gc.cc b/src/libstore/gc.cc
index a1bb4051cd..255dc3aa09 100644
--- a/src/libstore/gc.cc
+++ b/src/libstore/gc.cc
@@ -575,7 +575,7 @@ bool LocalStore::tryToDelete(GCState & state, const Path & path)
    safely deleted.  FIXME: race condition with optimisePath(): we
    might see a link count of 1 just before optimisePath() increases
    the link count. */
-void LocalStore::removeUnusedLinks()
+void LocalStore::removeUnusedLinks(const GCState & state)
 {
     AutoCloseDir dir = opendir(linksDir.c_str());
     if (!dir) throw SysError(format("opening directory `%1%'") % linksDir);
@@ -604,6 +604,8 @@ void LocalStore::removeUnusedLinks()
 
         if (unlink(path.c_str()) == -1)
             throw SysError(format("deleting `%1%'") % path);
+
+        state.results.bytesFreed += st.st_blocks * 512;
     }
 
     struct stat st;
@@ -732,7 +734,7 @@ void LocalStore::collectGarbage(const GCOptions & options, GCResults & results)
 
     /* Clean up the links directory. */
     printMsg(lvlError, format("deleting unused links..."));
-    removeUnusedLinks();
+    removeUnusedLinks(state);
 }
 
 
diff --git a/src/libstore/local-store.hh b/src/libstore/local-store.hh
index 721cc6afbe..6a5e3641c4 100644
--- a/src/libstore/local-store.hh
+++ b/src/libstore/local-store.hh
@@ -264,7 +264,7 @@ private:
         
     int openGCLock(LockType lockType);
     
-    void removeUnusedLinks();
+    void removeUnusedLinks(const GCState & state);
 
     void startSubstituter(const Path & substituter,
         RunningSubstituter & runningSubstituter);