From 1b4dc795bd0060bd64992f1355cbf197e0a20172 Mon Sep 17 00:00:00 2001
From: Jakob Unterwurzacher
Date: Fri, 9 Jun 2023 07:50:11 +0200
Subject: tests/cluster: note that ext4 provides no atomicity

---
 tests/cluster/cluster_test.go | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/tests/cluster/cluster_test.go b/tests/cluster/cluster_test.go
index 55a2b99..df35fb2 100644
--- a/tests/cluster/cluster_test.go
+++ b/tests/cluster/cluster_test.go
@@ -30,6 +30,13 @@ import (
 // > Other Linux filesystems only guaranty page level atomicity for
 // > buffered read/write.
 //
+// Note that ext4 actually provides NO ATOMICITY AT ALL.
+// Quoting https://stackoverflow.com/a/35256626 :
+//
+// > Linux 4.2.6 with ext4: update atomicity = 1 byte
+//
+// TestPoCTornWrite in this package confirms this.
+//
 // See also:
 // * https://lore.kernel.org/linux-xfs/20190325001044.GA23020@dastard/
 //   Dave Chinner: XFS is the only linux filesystem that provides this behaviour.
-- 
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