From 1b4f5f9b946266b5979266a608d659a07285531f Mon Sep 17 00:00:00 2001
From: Julian Harnath <julian.harnath@rwth-aachen.de>
Date: Sat, 11 Feb 2017 10:43:08 +0000
Subject: [PATCH] FUSE compat: fall back to truncate if no ftruncate

* As defined by the FUSE interface: if the FUSE module doesn't
  implement ftruncate(), fall back to using truncate() instead
---
 .../kernel/file_systems/userlandfs/server/fuse/FUSEVolume.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/add-ons/kernel/file_systems/userlandfs/server/fuse/FUSEVolume.cpp b/src/add-ons/kernel/file_systems/userlandfs/server/fuse/FUSEVolume.cpp
index b916346087..9b12a59b25 100644
--- a/src/add-ons/kernel/file_systems/userlandfs/server/fuse/FUSEVolume.cpp
+++ b/src/add-ons/kernel/file_systems/userlandfs/server/fuse/FUSEVolume.cpp
@@ -1474,6 +1474,10 @@ FUSEVolume::Open(void* _node, int openMode, void** _cookie)
 	// truncate the file, if requested
 	if (truncate) {
 		fuseError = fuse_fs_ftruncate(fFS, path, 0, cookie);
+		if (fuseError == ENOSYS) {
+			// Fallback to truncate if ftruncate is not implemented
+			fuseError = fuse_fs_truncate(fFS, path, 0);
+		}
 		if (fuseError != 0) {
 			fuse_fs_flush(fFS, path, cookie);
 			fuse_fs_release(fFS, path, cookie);