From ed5f8487b15f1d9cd83b4b0a4220271b6c5f189e Mon Sep 17 00:00:00 2001
From: Jakob Unterwurzacher
Date: Sun, 1 Feb 2026 20:05:13 +0100
Subject: syscallcompat: DetectQuirks: suppress Btrfs message when -noprealloc
 has been passed

Reported by @Tunoac, https://github.com/rfjakob/gocryptfs/issues/395#issuecomment-3828507487
---
 internal/fusefrontend/root_node.go | 4 ++++
 1 file changed, 4 insertions(+)

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

diff --git a/internal/fusefrontend/root_node.go b/internal/fusefrontend/root_node.go
index 8464c5f..489e3c6 100644
--- a/internal/fusefrontend/root_node.go
+++ b/internal/fusefrontend/root_node.go
@@ -91,6 +91,10 @@ func NewRootNode(args Args, c *contentenc.ContentEnc, n *nametransform.NameTrans
 		dirCache:      dirCache{ivLen: ivLen},
 		quirks:        syscallcompat.DetectQuirks(args.Cipherdir),
 	}
+	// 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.")
+	}
 	if statErr == nil {
 		rn.inoMap.TranslateStat(&st)
 		rn.rootIno = st.Ino
-- 
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