From 9efd5ec6c5e290a24a413dbcdbabc14e34d3177d Mon Sep 17 00:00:00 2001
From: Jakob Unterwurzacher
Date: Thu, 16 Jul 2026 21:10:14 +0200
Subject: fusefrontend: sharedstorage: truncate: error out on failed file lock

---
 internal/fusefrontend/file_allocate_truncate.go | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/internal/fusefrontend/file_allocate_truncate.go b/internal/fusefrontend/file_allocate_truncate.go
index ad02041..bfd11e1 100644
--- a/internal/fusefrontend/file_allocate_truncate.go
+++ b/internal/fusefrontend/file_allocate_truncate.go
@@ -114,7 +114,10 @@ func (f *File) truncate(newSize uint64) (errno syscall.Errno) {
 			// Prevent reads and writes concurrent with the truncate operation. It's
 			// racy on tmpfs and ext4 ( https://lore.kernel.org/all/18e9fa0f-ec31-9107-459c-ae1694503f87@gmail.com/t/ )
 			// as evident by TestOpenTruncate test failures.
-			f.LockSharedStorage(unix.F_WRLCK, 0, 0)
+			err = f.LockSharedStorage(unix.F_WRLCK, 0, 0)
+			if err != nil {
+				return fs.ToErrno(err)
+			}
 			defer f.UnlockSharedStorage(0, 0)
 
 			// With -sharedstorage, we keep the on-disk file header.
-- 
cgit v1.2.3