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