From a93bcabe9c1dea14bf29b94cbddf62c1bec4d315 Mon Sep 17 00:00:00 2001
From: David Gnedt <david@gnedt.at>
Date: Thu, 12 May 2016 19:51:13 +0200
Subject: [PATCH] Encrypt path in statfs() calls
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Paths in statfs() calls were not encrypted resulting in
an Function not implemented error, when the unencrypted
path didn't exist in the underlying (encrypted)
filesystem.

$ df plain/existingdir
df: ‘plain/existingdir’: Function not implemented
---
 internal/fusefrontend/fs.go | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/internal/fusefrontend/fs.go b/internal/fusefrontend/fs.go
index d2465dd4..b7528a13 100644
--- a/internal/fusefrontend/fs.go
+++ b/internal/fusefrontend/fs.go
@@ -228,6 +228,17 @@ func (fs *FS) Utimens(path string, Atime *time.Time, Mtime *time.Time, context *
 	return fs.FileSystem.Utimens(cPath, Atime, Mtime, context)
 }
 
+func (fs *FS) StatFs(path string) *fuse.StatfsOut {
+	if fs.isFiltered(path) {
+		return nil
+	}
+	cPath, err := fs.encryptPath(path)
+	if err != nil {
+		return nil
+	}
+	return fs.FileSystem.StatFs(cPath)
+}
+
 func (fs *FS) Readlink(path string, context *fuse.Context) (out string, status fuse.Status) {
 	cPath, err := fs.encryptPath(path)
 	if err != nil {