From 9b6e47fc0a2ed65d462424152a13f995a8d7dd9a Mon Sep 17 00:00:00 2001
From: Jakob Unterwurzacher
Date: Tue, 6 May 2025 09:11:49 +0200
Subject: Switch to the new atomic Uint64.Add api

The new api guarantees that the value is aligned, preventing
stuff like this on 32 bit platforms:

	goroutine 26 [running]:
	internal/runtime/atomic.panicUnaligned()
		/usr/lib/go-1.24/src/internal/runtime/atomic/unaligned.go:8 +0x24
	internal/runtime/atomic.Xadd64(0x2496c74, 0x1)
		/usr/lib/go-1.24/src/internal/runtime/atomic/atomic_arm.s:318 +0x14
	github.com/rfjakob/gocryptfs/internal/inomap.(*InoMap).NextSpillIno(0x2496c60)

Fixes https://github.com/rfjakob/gocryptfs/issues/912
---
 internal/fusefrontend_reverse/root_node.go | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

(limited to 'internal/fusefrontend_reverse/root_node.go')

diff --git a/internal/fusefrontend_reverse/root_node.go b/internal/fusefrontend_reverse/root_node.go
index c0ef814..9c2de28 100644
--- a/internal/fusefrontend_reverse/root_node.go
+++ b/internal/fusefrontend_reverse/root_node.go
@@ -50,7 +50,7 @@ type RootNode struct {
 	// makes go-fuse hand out separate FUSE Node IDs for each, and prevents
 	// bizarre problems when inode numbers are reused behind our back,
 	// like this one: https://github.com/rfjakob/gocryptfs/issues/802
-	gen uint64
+	gen atomic.Uint64
 	// rootIno is the inode number that we report for the root node on mount
 	rootIno uint64
 }
@@ -175,7 +175,7 @@ func (rn *RootNode) uniqueStableAttr(mode uint32, ino uint64) fs.StableAttr {
 		Ino:  ino,
 		// Make each directory entry a unique node by using a unique generation
 		// value. Also see the comment at RootNode.gen for details.
-		Gen: atomic.AddUint64(&rn.gen, 1),
+		Gen: rn.gen.Add(1),
 	}
 }
 
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