From 103cd358f2a448e598a31cc7013d9bf8cac2c7bb Mon Sep 17 00:00:00 2001
From: "Antonio S. Musumeci" <Antonio.Musumeci@morganstanley.com>
Date: Sat, 18 Apr 2026 00:45:23 -0400
Subject: [PATCH] state: atomic ref_count in OpenFile

ref_count is read and written from multiple FUSE worker threads
during open/release. Make it std::atomic<int> and provide a move
constructor so OpenFile remains movable when the underlying atomic
is non-movable.
---
 src/state.hpp | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/state.hpp b/src/state.hpp
index 5f36db48..b7905a51 100644
--- a/src/state.hpp
+++ b/src/state.hpp
@@ -79,6 +79,7 @@
 
 #include "fuse.h"
 
+#include <atomic>
 #include <functional>
 #include <map>
 #include <string>
@@ -102,7 +103,14 @@ public:
     {
     }
 
-    int ref_count;
+    OpenFile(OpenFile &&o_) noexcept
+      : ref_count(o_.ref_count.load()),
+        backing_id(o_.backing_id),
+        fi(o_.fi)
+    {
+    }
+
+    std::atomic<int> ref_count;
     int backing_id;
     FileInfo *fi;
   };