141 lines
4.7 KiB
Diff
141 lines
4.7 KiB
Diff
From d5027d43ea3969426ba64423b3c0bb38491cc880 Mon Sep 17 00:00:00 2001
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From: Tao Liu <ltao@redhat.com>
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Date: Fri, 10 Jun 2022 16:39:31 +0800
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Subject: [PATCH] feat(lvm): add new module lvmthinpool-monitor
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Previously dracut didn't support the feature of lvm thinpool autoextend.
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The feature is useful to cases such as kdump, when vmcore to be saved to a
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lvm thin volume. The thinpool should be able to autoextend, otherwise an
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IO error will be caused and leaves an incomplete vmcore.
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There is lvm2-monitor.service and dmeventd avaliable, however
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considering [1], it is not suitable for kdump and memory limited cases.
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This patch achieves the same by parallel looping a shell function in the
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background, which calls lvextend periodically. If thredshold reaches,
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autoextend it, if not then nothing happens.
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[1]: https://lists.fedoraproject.org/archives/list/kexec@lists.fedoraproject.org/message/YF254ZO3PJ3U56P4OKHV3JNYP2PJUMYX/
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Signed-off-by: Tao Liu <ltao@redhat.com>
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Resolves: #2098502
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---
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dracut.spec | 1 +
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modules.d/80lvmthinpool-monitor/module-setup.sh | 24 +++++++++++++
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.../start-thinpool-monitor.service | 14 ++++++++
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.../start-thinpool-monitor.sh | 41 ++++++++++++++++++++++
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4 files changed, 80 insertions(+)
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diff --git a/dracut.spec b/dracut.spec
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index c8783699..e1c22256 100644
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--- a/dracut.spec
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+++ b/dracut.spec
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@@ -350,6 +350,7 @@ echo 'dracut_rescue_image="yes"' > $RPM_BUILD_ROOT%{dracutlibdir}/dracut.conf.d/
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%{dracutlibdir}/modules.d/50drm
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%{dracutlibdir}/modules.d/50plymouth
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%{dracutlibdir}/modules.d/80lvmmerge
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+%{dracutlibdir}/modules.d/80lvmthinpool-monitor
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%{dracutlibdir}/modules.d/90btrfs
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%{dracutlibdir}/modules.d/90crypt
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%{dracutlibdir}/modules.d/90dm
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diff --git a/modules.d/80lvmthinpool-monitor/module-setup.sh b/modules.d/80lvmthinpool-monitor/module-setup.sh
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new file mode 100755
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index 00000000..ca015bdc
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--- /dev/null
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+++ b/modules.d/80lvmthinpool-monitor/module-setup.sh
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@@ -0,0 +1,24 @@
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+#!/bin/bash
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+
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+# called by dracut
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+check() {
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+ # No point trying to support lvm if the binaries are missing
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+ require_binaries lvm sort tr awk || return 1
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+
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+ return 255
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+}
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+
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+# called by dracut
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+depends() {
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+ echo lvm
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+ return 0
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+}
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+
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+# called by dracut
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+install() {
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+ inst_multiple sort tr awk
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+ inst_script "$moddir/start-thinpool-monitor.sh" "/bin/start-thinpool-monitor"
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+
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+ inst "$moddir/start-thinpool-monitor.service" "$systemdsystemunitdir/start-thinpool-monitor.service"
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+ $SYSTEMCTL -q --root "$initdir" add-wants initrd.target start-thinpool-monitor.service
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+}
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diff --git a/modules.d/80lvmthinpool-monitor/start-thinpool-monitor.service b/modules.d/80lvmthinpool-monitor/start-thinpool-monitor.service
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new file mode 100644
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index 00000000..97f5f1f4
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--- /dev/null
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+++ b/modules.d/80lvmthinpool-monitor/start-thinpool-monitor.service
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@@ -0,0 +1,14 @@
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+[Unit]
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+Description=Lvm thinpool monitor service
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+Before=initrd.target
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+After=initrd-fs.target
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+Conflicts=shutdown.target emergency.target
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+
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+[Service]
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+Type=forking
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+ExecStart=/bin/start-thinpool-monitor
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+PIDFile=/run/thinpool-moni.pid
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+StandardInput=null
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+StandardOutput=journal+console
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+StandardError=journal+console
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+KillSignal=SIGHUP
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diff --git a/modules.d/80lvmthinpool-monitor/start-thinpool-monitor.sh b/modules.d/80lvmthinpool-monitor/start-thinpool-monitor.sh
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new file mode 100755
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index 00000000..75d8eada
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--- /dev/null
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+++ b/modules.d/80lvmthinpool-monitor/start-thinpool-monitor.sh
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@@ -0,0 +1,41 @@
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+#!/bin/sh
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+
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+type getarg > /dev/null 2>&1 || . /lib/dracut-lib.sh
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+
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+LVS=$(getargs rd.lvm.lv -d rd_LVM_LV=)
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+
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+is_lvm2_thinp_device() {
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+ _device_path=$1
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+ _lvm2_thin_device=$(lvm lvs -S 'lv_layout=sparse && lv_layout=thin' \
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+ --nosuffix --noheadings -o vg_name,lv_name "$_device_path" 2> /dev/null)
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+
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+ [ -n "$_lvm2_thin_device" ] && return $?
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+}
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+
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+for LV in $LVS; do
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+ if is_lvm2_thinp_device "/dev/$LV"; then
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+ THIN_POOLS="$(lvm lvs -S 'lv_layout=sparse && lv_layout=thin' \
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+ --nosuffix --noheadings -o vg_name,pool_lv "$LV" \
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+ | awk '{printf("%s/%s",$1,$2);}') $THIN_POOLS"
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+ fi
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+done
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+
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+THIN_POOLS=$(echo "$THIN_POOLS" | tr ' ' '\n' | sort -u | tr '\n' ' ')
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+
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+if [ -n "$THIN_POOLS" ]; then
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+ if [ -e "/etc/lvm/lvm.conf" ]; then
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+ # Use 'monitoring=0' to override the value in lvm.conf, in case
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+ # dmeventd monitoring been started after the calling.
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+ CONFIG="activation {monitoring=0}"
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+ else
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+ CONFIG="activation {monitoring=0 thin_pool_autoextend_threshold=70 thin_pool_autoextend_percent=20}"
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+ fi
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+
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+ while true; do
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+ for THIN_POOL in $THIN_POOLS; do
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+ lvm lvextend --use-policies --config "$CONFIG" "$THIN_POOL"
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+ done
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+ sleep 5
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+ done &
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+ echo $! > /run/thinpool-moni.pid
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+fi
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