From ffb84bbc8c9548cc08967e7e71f3b081bc905a41 Mon Sep 17 00:00:00 2001
From: Forza <forza@noreply.localhost>
Date: Fri, 24 Nov 2023 09:08:46 +0100
Subject: [PATCH] Upload files to "/"

Tool to create a dm-cache device
---
 dmcache.sh | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)
 create mode 100644 dmcache.sh

diff --git a/dmcache.sh b/dmcache.sh
new file mode 100644
index 0000000..8ea125a
--- /dev/null
+++ b/dmcache.sh
@@ -0,0 +1,26 @@
+#!/bin/bash
+
+# dm-cache
+# A helper program to setup and manage device-mapper
+# cache devices.
+#
+# SPDX-License-Identifier: GPL-3.0-or-later
+# Copyright 2023 Forza <forza@tnonline.net>
+
+dmname="data"
+origindev="/dev/disk/by-partuuid/ac0ae9b1-8e32-4e33-b641-998bc0298d14" # use stable device ID, not FS UUID
+metadev="/dev/vg_800g/lv_cache_usb_backup_meta"
+cachedev="/dev/vg_800g/lv_cache_usb_backup_cache"
+blocksize="256" # dm-cache block size in sectors
+cachemode="writethrough" # writethrough, writeback, passthrough
+policy="default"
+
+dmsetup info "${dmname}" >/dev/null && echo "\"${dmname}\" already exists!" ; exit 1
+
+if [ -e "${origindev}" ] && [ -e "${metadev}" ] && [ -e "${cachedev}" ]; then
+	echo "Creating dm-cache device \"/dev/mapper/${dmname}\""
+	dmsetup create "${dmname}" --table "0 $(blockdev --getsz ${origindev}) cache ${metadev} ${cachedev} ${origindev} ${blocksize} 1 ${cachemode} ${policy} 0" || echo "Something went wrong. Check dmesg."
+else
+	echo "Can't find all required devices"
+fi
+