devstack/lib/lvm

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#!/bin/bash
#
# lib/lvm
# Configure the default LVM volume group used by Cinder and Nova
# Dependencies:
#
# - ``functions`` file
# - ``cinder`` configurations
# DATA_DIR
# clean_default_volume_group - called from clean()
# configure_default_volume_group - called from configure()
# init_default_volume_group - called from init()
# Save trace setting
_XTRACE_LVM=$(set +o | grep xtrace)
set +o xtrace
# Defaults
# --------
# Name of the lvm volume groups to use/create for iscsi volumes
VOLUME_GROUP_NAME=${VOLUME_GROUP_NAME:-stack-volumes}
DEFAULT_VOLUME_GROUP_NAME=$VOLUME_GROUP_NAME-default
# Backing file name is of the form $VOLUME_GROUP$BACKING_FILE_SUFFIX
BACKING_FILE_SUFFIX=-backing-file
# Functions
# ---------
# _clean_lvm_volume_group removes all default LVM volumes
#
# Usage: _clean_lvm_volume_group $vg
function _clean_lvm_volume_group {
local vg=$1
# Clean out existing volumes
sudo lvremove -f $vg
}
# _remove_lvm_volume_group removes the volume group
#
# Usage: _remove_lvm_volume_group $vg
function _remove_lvm_volume_group {
local vg=$1
# Remove the volume group
sudo vgremove -f $vg
}
# clean_lvm_volume_group() cleans up the volume group and removes the
# backing file
#
# Usage: clean_lvm_volume_group() $vg
function clean_lvm_volume_group {
local vg=$1
_clean_lvm_volume_group $vg
_remove_lvm_volume_group $vg
# if there is no logical volume left, it's safe to attempt a cleanup
# of the backing file
if [[ -z "$(sudo lvs --noheadings -o lv_name $vg 2>/dev/null)" ]]; then
local backing_file=$DATA_DIR/$vg$BACKING_FILE_SUFFIX
if [[ -n "$vg$BACKING_FILE_SUFFIX" ]] && \
[[ -e "/etc/systemd/system/$vg$BACKING_FILE_SUFFIX.service" ]]; then
sudo systemctl disable --now $vg$BACKING_FILE_SUFFIX.service
sudo rm -f /etc/systemd/system/$vg$BACKING_FILE_SUFFIX.service
sudo systemctl daemon-reload
fi
# If the backing physical device is a loop device, it was probably setup by DevStack
if [[ -n "$backing_file" ]] && [[ -e "$backing_file" ]]; then
rm -f $backing_file
fi
fi
}
# _create_lvm_volume_group creates default volume group
#
# Usage: _create_lvm_volume_group() $vg $size
function _create_lvm_volume_group {
local vg=$1
local size=$2
local backing_file=$DATA_DIR/$vg$BACKING_FILE_SUFFIX
if ! sudo vgs $vg; then
# Only create if the file doesn't already exists
[[ -f $backing_file ]] || truncate -s $size $backing_file
local directio=""
# Check to see if we can do direct-io
if losetup -h | grep -q direct-io; then
directio="--direct-io=on"
fi
# Only create systemd service if it doesn't already exists
if [[ ! -e "/etc/systemd/system/$vg$BACKING_FILE_SUFFIX.service" ]]; then
sed -e "
s|%DIRECTIO%|${directio}|g;
s|%BACKING_FILE%|${backing_file}|g;
" $FILES/lvm-backing-file.template | sudo tee \
/etc/systemd/system/$vg$BACKING_FILE_SUFFIX.service
sudo systemctl daemon-reload
sudo systemctl enable --now $vg$BACKING_FILE_SUFFIX.service
fi
local vg_dev
vg_dev=$(sudo losetup --associated $backing_file -O NAME -n)
# Only create volume group if it doesn't already exist
if ! sudo vgs $vg; then
sudo vgcreate $vg $vg_dev
fi
fi
}
# init_lvm_volume_group() initializes the volume group creating the backing
# file if necessary
#
# Usage: init_lvm_volume_group() $vg $size
function init_lvm_volume_group {
local vg=$1
local size=$2
# Start the tgtd service on Fedora if tgtadm is used
if is_fedora; then
start_service tgtd
fi
# Start with a clean volume group
_create_lvm_volume_group $vg $size
if is_service_enabled cinder; then
# Remove iscsi targets
if [ "$CINDER_TARGET_HELPER" = "lioadm" ]; then
sudo cinder-rtstool get-targets | sudo xargs -rn 1 cinder-rtstool delete
elif [ "$CINDER_TARGET_HELPER" = "tgtadm" ]; then
sudo tgtadm --op show --mode target | awk '/Target/ {print $3}' | sudo xargs -r -n1 tgt-admin --delete
elif [ "$CINDER_TARGET_HELPER" = "nvmet" ]; then
# If we don't disconnect everything vgremove will block
sudo nvme disconnect-all
sudo nvmetcli clear
fi
fi
_clean_lvm_volume_group $vg
}
# Sentinal value to ensure that init of default lvm volume group is
# only performed once across calls of init_default_lvm_volume_group.
_DEFAULT_LVM_INIT=${_DEFAULT_LVM_INIT:-0}
# init_default_lvm_volume_group() initializes a default volume group
# intended to be shared between cinder and nova. It is idempotent;
# the init of the default volume group is guaranteed to be performed
# only once so that either or both of the dependent services can
# safely call this function.
#
# Usage: init_default_lvm_volume_group()
function init_default_lvm_volume_group {
if [[ "$_DEFAULT_LVM_INIT" = "0" ]]; then
init_lvm_volume_group $DEFAULT_VOLUME_GROUP_NAME $VOLUME_BACKING_FILE_SIZE
_DEFAULT_LVM_INIT=1
fi
}
# clean_lvm_filter() Remove the filter rule set in set_lvm_filter()
#
# Usage: clean_lvm_filter()
function clean_lvm_filter {
sudo sed -i "s/^.*# from devstack$//" /etc/lvm/lvm.conf
}
# set_lvm_filter() Gather all devices configured for LVM and
# use them to build a global device filter
# set_lvm_filter() Create a device filter
# and add to /etc/lvm.conf. Note this uses
# all current PV's in use by LVM on the
# system to build it's filter.
#
# Usage: set_lvm_filter()
function set_lvm_filter {
local filter_suffix='"r|.*|" ] # from devstack'
local filter_string="global_filter = [ "
local pv
local vg
local line
for pv_info in $(sudo pvs --noheadings -o name); do
pv=$(echo -e "${pv_info}" | sed 's/ //g' | sed 's/\/dev\///g')
new="\"a|$pv|\", "
filter_string=$filter_string$new
done
filter_string=$filter_string$filter_suffix
clean_lvm_filter
sudo sed -i "/# global_filter = \[.*\]/a\ $filter_string" /etc/lvm/lvm.conf
echo_summary "set lvm.conf device global_filter to: $filter_string"
}
# Restore xtrace
$_XTRACE_LVM
# mode: shell-script
# End: