From b1b5e09081060128c9bbf37315bd1359e4dde3a3 Mon Sep 17 00:00:00 2001
From: Yves G <theYinYeti@yalis.fr>
Date: Sat, 29 Feb 2020 15:07:45 +0100
Subject: [PATCH] vfs: make `df` output more consistent on a rclone mount.

When 2 values are known among vfs:{free,used,total}, compute the 3rd
---
 vfs/vfs.go | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/vfs/vfs.go b/vfs/vfs.go
index 58e7630b1..ccd10265c 100644
--- a/vfs/vfs.go
+++ b/vfs/vfs.go
@@ -510,6 +510,15 @@ func (vfs *VFS) Statfs() (total, used, free int64) {
 		if u.Used != nil {
 			used = *u.Used
 		}
+		if total < 0 && free >= 0 && used >= 0 {
+			total = free + used
+		}
+		if free < 0 && total >= 0 && used >= 0 {
+			free = total - used
+		}
+		if used < 0 && total >= 0 && free >= 0 {
+			used = total - free
+		}
 	}
 	return
 }