From 3b07f9d34dfb4380d39c9c6523234b49463a516a Mon Sep 17 00:00:00 2001
From: skbeh <60107333+skbeh@users.noreply.github.com>
Date: Mon, 25 Aug 2025 10:19:47 +0000
Subject: [PATCH] combine: propagate SlowHash feature

---
 backend/combine/combine.go | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/backend/combine/combine.go b/backend/combine/combine.go
index d01071a95..80e2d6d0f 100644
--- a/backend/combine/combine.go
+++ b/backend/combine/combine.go
@@ -241,18 +241,22 @@ func NewFs(ctx context.Context, name, root string, m configmap.Mapper) (outFs fs
 		DirModTimeUpdatesOnWrite: true,
 		PartialUploads:           true,
 	}).Fill(ctx, f)
-	canMove := true
+	canMove, slowHash := true, false
 	for _, u := range f.upstreams {
 		features = features.Mask(ctx, u.f) // Mask all upstream fs
 		if !operations.CanServerSideMove(u.f) {
 			canMove = false
 		}
+		slowHash = slowHash || u.f.Features().SlowHash
 	}
 	// We can move if all remotes support Move or Copy
 	if canMove {
 		features.Move = f.Move
 	}
 
+	// If any of upstreams are SlowHash, propagate it
+	features.SlowHash = slowHash
+
 	// Enable ListR when upstreams either support ListR or is local
 	// But not when all upstreams are local
 	if features.ListR == nil {