From b024e3696d215e6b7a0b8d17ca3eb28af20dd504 Mon Sep 17 00:00:00 2001
From: Jared Van Bortel
Date: Fri, 6 Feb 2026 15:16:40 -0500
Subject: enable falloc on btrfs if CoW is disabled

---
 internal/fusefrontend/root_node.go | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'internal/fusefrontend')

diff --git a/internal/fusefrontend/root_node.go b/internal/fusefrontend/root_node.go
index aa26b9c..38d070d 100644
--- a/internal/fusefrontend/root_node.go
+++ b/internal/fusefrontend/root_node.go
@@ -92,7 +92,9 @@ func NewRootNode(args Args, c *contentenc.ContentEnc, n *nametransform.NameTrans
 	}
 	// Suppress the message if the user has already specified -noprealloc
 	if rn.quirks&syscallcompat.QuirkBtrfsBrokenFalloc != 0 && !args.NoPrealloc {
-		syscallcompat.LogQuirk("Btrfs detected, forcing -noprealloc. See https://github.com/rfjakob/gocryptfs/issues/395 for why.")
+		syscallcompat.LogQuirk("Btrfs detected, forcing -noprealloc. " +
+			"Use \"chattr +C\" on the backing directory to enable NOCOW and allow preallocation. " +
+			"See https://github.com/rfjakob/gocryptfs/issues/395 for details.")
 	}
 	if statErr == nil {
 		rn.inoMap.TranslateStat(&st)
-- 
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