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Tool to create a dm-cache device

dmcache.sh

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+#!/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
+