From 556cc3a4ca6702346688a82e9b2fb72266c2c307 Mon Sep 17 00:00:00 2001
From: Chris Lu <chris.lu@gmail.com>
Date: Mon, 31 May 2021 16:42:55 -0700
Subject: [PATCH] mount: avoid exception if disk cache is not initialized

related to https://github.com/chrislusf/seaweedfs/issues/2102
---
 weed/util/chunk_cache/on_disk_cache_layer.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/weed/util/chunk_cache/on_disk_cache_layer.go b/weed/util/chunk_cache/on_disk_cache_layer.go
index a4b3b6994..b004913ef 100644
--- a/weed/util/chunk_cache/on_disk_cache_layer.go
+++ b/weed/util/chunk_cache/on_disk_cache_layer.go
@@ -42,6 +42,10 @@ func NewOnDiskCacheLayer(dir, namePrefix string, diskSize int64, segmentCount in
 
 func (c *OnDiskCacheLayer) setChunk(needleId types.NeedleId, data []byte) {
 
+	if len(c.diskCaches) == 0 {
+		return
+	}
+
 	if c.diskCaches[0].fileSize+int64(len(data)) > c.diskCaches[0].sizeLimit {
 		t, resetErr := c.diskCaches[len(c.diskCaches)-1].Reset()
 		if resetErr != nil {