Forza/dm-cache
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Update openrc/dmcache.initd

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Move blockdev --getsz to checkconfig()
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Forza 2023-11-24 09:34:14 +01:00
parent ffb84bbc8c
commit 16fe60eb45
1 changed files with 115 additions and 115 deletions
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openrc/dmcache.initd
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@ -1,115 +1,115 @@
#!/sbin/openrc-run #!/sbin/openrc-run
# shellcheck shell=sh # shellcheck shell=sh
# dm-cache # dm-cache
# A helper program to setup and manage device-mapper # A helper program to setup and manage device-mapper
# cache devices. # cache devices.
# #
# SPDX-License-Identifier: GPL-3.0-or-later # SPDX-License-Identifier: GPL-3.0-or-later
# Copyright 2023 Forza <forza@tnonline.net> # Copyright 2023 Forza <forza@tnonline.net>
name="dm-cache ${dmname}" name="dm-cache ${dmname}"
description="Activates dm-cache devices" description="Activates dm-cache devices"
extra_started_commands="suspend resume cleaner" extra_started_commands="suspend resume cleaner"
: "${cacheblock:=256}" : "${cacheblock:=256}"
: "${cachemode:="1 writethrough"}" : "${cachemode:="1 writethrough"}"
: "${cachepolicy:="default"}" : "${cachepolicy:="default"}"
: "${cachepolicyargs:=0}" : "${cachepolicyargs:=0}"
: "${readahead:="auto"}" : "${readahead:="auto"}"
# dm-cache requires the origindev size in sectors.
: "${originsize:="$(/sbin/blockdev --getsz "${origindev}")"}" depend() {
need dev modules
depend() { use lvm
need dev modules before localmount
use lvm }
before localmount
} checkconfig() {
if [ -z "${origindev}" ]; then
checkconfig() { eerror "origindev not set!"
if [ -z "${origindev}" ]; then return 1
eerror "origindev not set!" fi
return 1 if [ -z "${metadev}" ]; then
fi eerror "metadev not set!"
if [ -z "${metadev}" ]; then return 1
eerror "metadev not set!" fi
return 1 if [ -z "${cachedev}" ]; then
fi eerror "cachedev not set!"
if [ -z "${cachedev}" ]; then return 1
eerror "cachedev not set!" fi
return 1 if [ -z "${dmname}" ]; then
fi eerror "dmname not set!"
if [ -z "${dmname}" ]; then return 1
eerror "dmname not set!" fi
return 1 # dm-cache requires the origindev size in sectors.
fi : "${originsize:="$(/sbin/blockdev --getsz "${origindev}")"}"
} }
start() { start() {
checkconfig || return 1 checkconfig || return 1
ebegin "Creating dm-cache ${dmname}" ebegin "Creating dm-cache ${dmname}"
if findmnt "${origindev}" > /dev/null; then if findmnt "${origindev}" > /dev/null; then
eerror "Origin device is already mounted. Aborting." eerror "Origin device is already mounted. Aborting."
exit 1 exit 1
fi fi
dmsetup create "${dmname}" --table "0 ${originsize} cache ${metadev} ${cachedev} ${origindev} ${cacheblock} ${cachemode} ${cachepolicy} ${cachepolicyargs}" --readahead "${readahead}" dmsetup create "${dmname}" --table "0 ${originsize} cache ${metadev} ${cachedev} ${origindev} ${cacheblock} ${cachemode} ${cachepolicy} ${cachepolicyargs}" --readahead "${readahead}"
eend $? eend $?
} }
stop() { stop() {
if [ "$RC_RUNLEVEL" = "shutdown" ]; then if [ "$RC_RUNLEVEL" = "shutdown" ]; then
if findmnt "/dev/mapper/${dmname}" > /dev/null; then if findmnt "/dev/mapper/${dmname}" > /dev/null; then
ewarn "System is shutting down and \"${dmname}\" is still mounted!" ewarn "System is shutting down and \"${dmname}\" is still mounted!"
ewarn "Attempting to unmount holders..." ewarn "Attempting to unmount holders..."
umount --all-targets "/dev/mapper/${dmname}" || eerror "Could not unmount!" umount --all-targets "/dev/mapper/${dmname}" || eerror "Could not unmount!"
fi fi
else else
if findmnt "/dev/mapper/${dmname}" > /dev/null; then if findmnt "/dev/mapper/${dmname}" > /dev/null; then
eerror "Cannot stop dm-cache. \"${dmname}\" is mounted!" eerror "Cannot stop dm-cache. \"${dmname}\" is mounted!"
exit 1 exit 1
fi fi
fi fi
ebegin "Stopping dm-cache ${dmname}" ebegin "Stopping dm-cache ${dmname}"
# Cannot flush or stop a suapended device. # Cannot flush or stop a suapended device.
dmsetup resume "${dmname}" dmsetup resume "${dmname}"
blockdev --flushbufs "/dev/mapper/${dmname}" blockdev --flushbufs "/dev/mapper/${dmname}"
einfo "Waiting for flush. This can take a while with large caches..." einfo "Waiting for flush. This can take a while with large caches..."
dmsetup remove "${dmname}" dmsetup remove "${dmname}"
exit $? exit $?
} }
cleaner() { cleaner() {
# The Cleaner policy attempts to write out cached data # The Cleaner policy attempts to write out cached data
# to the origin device at a higher rate. This is useful # to the origin device at a higher rate. This is useful
# if you want to remove or decomission the dm-cache. # if you want to remove or decomission the dm-cache.
# Cleaner only makes sense for the 'writeback' mode. # Cleaner only makes sense for the 'writeback' mode.
checkconfig || return 1 checkconfig || return 1
ebegin "Enabling the Cleaner write cache policy." ebegin "Enabling the Cleaner write cache policy."
dmsetup suspend "${dmname}" dmsetup suspend "${dmname}"
dmsetup reload -r --table "0 ${originsize} cache ${metadev} ${cachedev} ${origindev} ${cacheblock} ${cachemode} cleaner 0" "${dmname}" dmsetup reload -r --table "0 ${originsize} cache ${metadev} ${cachedev} ${origindev} ${cacheblock} ${cachemode} cleaner 0" "${dmname}"
errorlevel=$? errorlevel=$?
if [ ! $errorlevel = 0 ]; then if [ ! $errorlevel = 0 ]; then
ewarn "Could not change to Cleaner policy" ewarn "Could not change to Cleaner policy"
fi fi
dmsetup resume "${dmname}" dmsetup resume "${dmname}"
eend $? eend $?
} }
suspend() { suspend() {
checkconfig || return 1 checkconfig || return 1
if findmnt "/dev/mapper/${dmname}" > /dev/null; then if findmnt "/dev/mapper/${dmname}" > /dev/null; then
ewarn "Warning, \"${dmname}\" is mounted!" ewarn "Warning, \"${dmname}\" is mounted!"
fi fi
ebegin "Suspending \"${dmname}\"" ebegin "Suspending \"${dmname}\""
dmsetup suspend "${dmname}" dmsetup suspend "${dmname}"
eend $? eend $?
} }
resume() { resume() {
checkconfig || return 1 checkconfig || return 1
ebegin "Resuming \"${dmname}\"" ebegin "Resuming \"${dmname}\""
dmsetup resume "${dmname}" dmsetup resume "${dmname}"
eend $? eend $?
} }