116 lines
2.9 KiB
Plaintext
116 lines
2.9 KiB
Plaintext
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#!/sbin/openrc-run
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# shellcheck shell=sh
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# dm-cache
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# A helper program to setup and manage device-mapper
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# cache devices.
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#
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# SPDX-License-Identifier: GPL-3.0-or-later
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# Copyright 2023 Forza <forza@tnonline.net>
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name="dm-cache ${dmname}"
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description="Activates dm-cache devices"
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extra_started_commands="suspend resume cleaner"
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: "${cacheblock:=256}"
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: "${cachemode:="1 writethrough"}"
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: "${cachepolicy:="default"}"
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: "${cachepolicyargs:=0}"
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: "${readahead:="auto"}"
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# dm-cache requires the origindev size in sectors.
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: "${originsize:="$(/sbin/blockdev --getsz "${origindev}")"}"
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depend() {
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need dev modules
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use lvm
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before localmount
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}
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checkconfig() {
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if [ -z "${origindev}" ]; then
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eerror "origindev not set!"
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return 1
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fi
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if [ -z "${metadev}" ]; then
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eerror "metadev not set!"
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return 1
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fi
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if [ -z "${cachedev}" ]; then
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eerror "cachedev not set!"
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return 1
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fi
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if [ -z "${dmname}" ]; then
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eerror "dmname not set!"
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return 1
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fi
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}
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start() {
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checkconfig || return 1
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ebegin "Creating dm-cache ${dmname}"
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if findmnt "${origindev}" > /dev/null; then
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eerror "Origin device is already mounted. Aborting."
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exit 1
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fi
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dmsetup create "${dmname}" --table "0 ${originsize} cache ${metadev} ${cachedev} ${origindev} ${cacheblock} ${cachemode} ${cachepolicy} ${cachepolicyargs}" --readahead "${readahead}"
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eend $?
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}
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stop() {
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if [ "$RC_RUNLEVEL" = "shutdown" ]; then
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if findmnt "/dev/mapper/${dmname}" > /dev/null; then
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ewarn "System is shutting down and \"${dmname}\" is still mounted!"
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ewarn "Attempting to unmount holders..."
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umount --all-targets "/dev/mapper/${dmname}" || eerror "Could not unmount!"
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fi
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else
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if findmnt "/dev/mapper/${dmname}" > /dev/null; then
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eerror "Cannot stop dm-cache. \"${dmname}\" is mounted!"
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exit 1
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fi
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fi
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ebegin "Stopping dm-cache ${dmname}"
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# Cannot flush or stop a suapended device.
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dmsetup resume "${dmname}"
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blockdev --flushbufs "/dev/mapper/${dmname}"
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einfo "Waiting for flush. This can take a while with large caches..."
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dmsetup remove "${dmname}"
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exit $?
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}
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cleaner() {
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# The Cleaner policy attempts to write out cached data
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# to the origin device at a higher rate. This is useful
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# if you want to remove or decomission the dm-cache.
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# Cleaner only makes sense for the 'writeback' mode.
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checkconfig || return 1
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ebegin "Enabling the Cleaner write cache policy."
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dmsetup suspend "${dmname}"
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dmsetup reload -r --table "0 ${originsize} cache ${metadev} ${cachedev} ${origindev} ${cacheblock} ${cachemode} cleaner 0" "${dmname}"
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errorlevel=$?
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if [ ! $errorlevel = 0 ]; then
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ewarn "Could not change to Cleaner policy"
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fi
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dmsetup resume "${dmname}"
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eend $?
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}
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suspend() {
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checkconfig || return 1
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if findmnt "/dev/mapper/${dmname}" > /dev/null; then
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ewarn "Warning, \"${dmname}\" is mounted!"
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fi
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ebegin "Suspending \"${dmname}\""
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dmsetup suspend "${dmname}"
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eend $?
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}
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resume() {
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checkconfig || return 1
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ebegin "Resuming \"${dmname}\""
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dmsetup resume "${dmname}"
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eend $?
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}
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