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dom0: Use /var/run/xen-hotplug to store information needed for block devices cleanup.

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Libxl removes xenstore entries before udev (+scripts) have chance to read it.
This commit is contained in:
Marek Marczykowski 2011-06-09 14:06:24 +02:00
parent 60b86de2ca
commit 68b5a71add
1 changed files with 11 additions and 4 deletions
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15
common/block-snapshot
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@ -7,6 +7,8 @@
dir=$(dirname "$0")
. "$dir/block-common.sh"
HOTPLUG_STORE="/var/run/xen-hotplug/${XENBUS_PATH//\//-}"
get_dev() {
dev=$1
@ -89,7 +91,6 @@ create_dm_snapshot_origin() {
t=$(xenstore_read_default "$XENBUS_PATH/type" 'MISSING')
case "$command" in
add)
case $t in
@ -117,14 +118,20 @@ case "$command" in
if [ "$t" == "snapshot" ]; then
#that's all for snapshot, store name of prepared device
xenstore_write "$XENBUS_PATH/node" "/dev/mapper/$dm_devname"
echo "/dev/mapper/$dm_devname" > "$HOTPLUG_STORE-node"
write_dev /dev/mapper/$dm_devname
elif [ "$t" == "origin" ]; then
# for origin - prepare snapshot-origin device and store its name
dm_devname=origin-$(stat -c '%D:%i' "$base")
create_dm_snapshot_origin $dm_devname "$base"
xenstore_write "$XENBUS_PATH/node" "/dev/mapper/$dm_devname"
echo "/dev/mapper/$dm_devname" > "$HOTPLUG_STORE-node"
write_dev /dev/mapper/$dm_devname
fi
# Save domain name for template commit on device remove
domid=$(xenstore_read "$XENBUS_PATH/frontend-id")
domain=$(xl domname $domid)
echo $domain > "$HOTPLUG_STORE-domain"
release_lock "block"
exit 0
@ -134,7 +141,7 @@ case "$command" in
remove)
case $t in
snapshot|origin)
node=$(xenstore_read "$XENBUS_PATH/node")
node=$(cat "$HOTPLUG_STORE-node")
if [ -z "$node" ]; then
fatal "No device node to remove"
@ -175,13 +182,13 @@ case "$command" in
fi
done
# Commit template changes
domain=$(xenstore_read "$XENBUS_PATH/domain")
domain=$(cat "$HOTPLUG_STORE-domain")
if [ "$domain" ]; then
# Dont stop on errors
/usr/bin/qvm-template-commit "$domain" || true
fi
fi
if [ -e $node ]; then
log debug "Removing $node"
dmsetup remove $node