[Pkg-xen-devel] Bug#588406: xen-utils-common: /etc/xen/scripts/block not driving helper scripts; XEN_SCRIPT_DIR not properly set
James Pfeifer
james at pfeifdom.net
Thu Jul 8 04:05:13 UTC 2010
Package: xen-utils-common
Version: 4.0.0-1
Severity: normal
After upgrading xen-utils-common from 3.4.2-4 to 4.0.0-1, I could not create
a guest domain defined with a DRBD file type. The xm create command would
fail with "Error: Device 51713 (vbd) could not be connected. Hotplug scripts
not working.". After some research I realized the /etc/xen/scripts/block-drbd
helper script was not being driven. My work around was to modify
/etc/xen/scripts/block; I replaced
[ -x ${XEN_SCRIPT_DIR}/block-"$t" ] && \
${XEN_SCRIPT_DIR}/block-"$t$" "$command" $node
with
[ -x /etc/xen/scripts/block-"$t" ] && \
/etc/xen/scripts/block-"$t" "$command" $node
It appears as though XEN_SCRIPT_DIR has not been properly set.
-- System Information:
Debian Release: squeeze/sid
APT prefers testing
APT policy: (500, 'testing')
Architecture: amd64 (x86_64)
Kernel: Linux 2.6.32-5-xen-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Versions of packages xen-utils-common depends on:
ii gawk 1:3.1.7.dfsg-5 GNU awk, a pattern scanning and pr
ii lsb-base 3.2-23.1 Linux Standard Base 3.2 init scrip
ii udev 158-1 /dev/ and hotplug management daemo
ii xenstore-utils 3.4.3-1 Xenstore utilities for Xen
xen-utils-common recommends no packages.
xen-utils-common suggests no packages.
-- Configuration Files:
/etc/xen/scripts/block changed:
dir=$(dirname "$0")
. "$dir/block-common.sh"
expand_dev() {
local dev
case $1 in
/*)
dev=$1
;;
*)
dev=/dev/$1
;;
esac
echo -n $dev
}
find_free_loopback_helper() {
local next_devnum=0
local busy_devnum
while read busy_devnum; do
if [ "$next_devnum" != "$busy_devnum" ]; then
break
fi
let next_devnum=$next_devnum+1
done
echo "/dev/loop${next_devnum}"
}
find_free_loopback_dev() {
local loopdev
loopdev=$(losetup -a | sed -e 's+^/dev/loop++' -e 's/:.*//' | find_free_loopback_helper)
if [ -n "$loopdev" ] && [ -b "$loopdev" ]; then
echo "$loopdev"
fi
}
check_sharing()
{
local dev="$1"
local mode="$2"
local devmm=$(device_major_minor "$dev")
local file
if [ "$mode" = 'w' ]
then
toskip="^$"
else
toskip="^[^ ]* [^ ]* [^ ]* ro[, ]"
fi
for file in $(cat /proc/mounts | grep -v "$toskip" | cut -f 1 -d ' ')
do
if [ -e "$file" ]
then
local d=$(device_major_minor "$file")
if [ "$d" = "$devmm" ]
then
echo 'local'
return
fi
fi
done
local base_path="$XENBUS_BASE_PATH/$XENBUS_TYPE"
for dom in $(xenstore-list "$base_path")
do
for dev in $(xenstore-list "$base_path/$dom")
do
d=$(xenstore_read_default "$base_path/$dom/$dev/physical-device" "")
if [ "$d" = "$devmm" ]
then
if [ "$mode" = 'w' ]
then
if ! same_vm $dom
then
echo 'guest'
return
fi
else
local m=$(xenstore_read_default "$base_path/$dom/$dev/mode" "")
m=$(canonicalise_mode "$m")
if [ "$m" = 'w' ]
then
if ! same_vm $dom
then
echo 'guest'
return
fi
fi
fi
fi
done
done
echo 'ok'
}
check_device_sharing()
{
local dev="$1"
local mode=$(canonicalise_mode "$2")
local result
if [ "x$mode" = 'x!' ]
then
return 0
fi
result=$(check_sharing "$dev" "$mode")
if [ "$result" != 'ok' ]
then
do_ebusy "Device $dev is mounted " "$mode" "$result"
fi
}
check_file_sharing()
{
local file="$1"
local dev="$2"
local mode="$3"
result=$(check_sharing "$dev" "$mode")
if [ "$result" != 'ok' ]
then
do_ebusy "File $file is loopback-mounted through $dev,
which is mounted " "$mode" "$result"
fi
}
do_ebusy()
{
local prefix="$1"
local mode="$2"
local result="$3"
if [ "$result" = 'guest' ]
then
dom='a guest '
when='now'
else
dom='the privileged '
when='by a guest'
fi
if [ "$mode" = 'w' ]
then
m1=''
m2=''
else
m1='read-write '
m2='read-only '
fi
release_lock "block"
ebusy \
"${prefix}${m1}in ${dom}domain,
and so cannot be mounted ${m2}${when}."
}
t=$(xenstore_read_default "$XENBUS_PATH/type" 'MISSING')
case "$command" in
add)
phys=$(xenstore_read_default "$XENBUS_PATH/physical-device" 'MISSING')
if [ "$phys" != 'MISSING' ]
then
# Depending upon the hotplug configuration, it is possible for this
# script to be called twice, so just bail.
exit 0
fi
if [ -n "$t" ]
then
p=$(xenstore_read "$XENBUS_PATH/params")
mode=$(xenstore_read "$XENBUS_PATH/mode")
fi
FRONTEND_ID=$(xenstore_read "$XENBUS_PATH/frontend-id")
FRONTEND_UUID=$(xenstore_read_default \
"/local/domain/$FRONTEND_ID/vm" 'unknown')
case $t in
phy)
dev=$(expand_dev $p)
if [ -L "$dev" ]
then
dev=$(readlink -f "$dev") || fatal "$dev link does not exist."
fi
test -e "$dev" || fatal "$dev does not exist."
test -b "$dev" || fatal "$dev is not a block device."
claim_lock "block"
check_device_sharing "$dev" "$mode"
write_dev "$dev"
release_lock "block"
exit 0
;;
file)
# Canonicalise the file, for sharing check comparison, and the mode
# for ease of use here.
file=$(readlink -f "$p") || fatal "$p does not exist."
test -f "$file" || fatal "$file does not exist."
mode=$(canonicalise_mode "$mode")
claim_lock "block"
# Avoid a race with the remove if the path has been deleted, or
# otherwise changed from "InitWait" state e.g. due to a timeout
xenbus_state=$(xenstore_read_default "$XENBUS_PATH/state" 'unknown')
if [ "$xenbus_state" != '2' ]
then
release_lock "block"
fatal "Path closed or removed during hotplug add: $XENBUS_PATH state: $xenbus_state"
fi
if [ "$mode" = 'w' ] && ! stat "$file" -c %A | grep -q w
then
release_lock "block"
ebusy \
"File $file is read-only, and so I will not
mount it read-write in a guest domain."
fi
if [ "x$mode" != 'x!' ]
then
inode=$(stat -c '%i' $file)
dev=$(stat -c '%D' $file)
if [ -z "$inode" ] || [ -z "$dev" ]
then
fatal "Unable to lookup $file: dev: $dev inode: $inode"
fi
shared_list=$(losetup -a | grep ' \[0*'${dev}'\]:'${inode} |
cut -d : -f 1)
for dev in "$shared_list"
do
if [ -n "$dev" ]
then
check_file_sharing "$file" "$dev" "$mode"
fi
done
fi
loopdev=$(losetup -f 2>/dev/null || find_free_loopback_dev)
if [ "$loopdev" = '' ]
then
release_lock "block"
fatal 'Failed to find an unused loop device'
fi
if LANG=C losetup -h 2>&1 | grep read-only >/dev/null
then
roflag="-$mode"; roflag="${roflag#-w}"; roflag="${roflag#-!}"
else
roflag=''
fi
do_or_die losetup $roflag "$loopdev" "$file"
xenstore_write "$XENBUS_PATH/node" "$loopdev"
write_dev "$loopdev"
release_lock "block"
exit 0
;;
"")
claim_lock "block"
success
release_lock "block"
;;
esac
;;
remove)
case $t in
phy)
exit 0
;;
file)
claim_lock "block"
node=$(xenstore_read "$XENBUS_PATH/node")
losetup -d "$node"
release_lock "block"
exit 0
;;
"")
exit 0
;;
esac
;;
esac
[ -x /etc/xen/scripts/block-"$t" ] && \
/etc/xen/scripts/block-"$t" "$command" $node
/etc/xen/scripts/vif-bridge changed:
dir=$(dirname "$0")
. "$dir/vif-common.sh"
bridge=${bridge:-}
bridge=$(xenstore_read_default "$XENBUS_PATH/bridge" "$bridge")
if [ -z "$bridge" ]
then
bridge=$(brctl show | cut -d "
" -f 2 | cut -f 1)
if [ -z "$bridge" ]
then
fatal "Could not find bridge, and none was specified"
fi
else
#
# Old style bridge setup with netloop, used to have a bridge name
# of xenbrX, enslaving pethX and vif0.X, and then configuring
# eth0.
#
# New style bridge setup does not use netloop, so the bridge name
# is ethX and the physical device is enslaved pethX
#
# So if...
#
# - User asks for xenbrX
# - AND xenbrX doesn't exist
# - AND there is a ethX device which is a bridge
#
# ..then we translate xenbrX to ethX
#
# This lets old config files work without modification
#
if [ ! -e "/sys/class/net/$bridge" ] && [ -z "${bridge##xenbr*}" ]
then
if [ -e "/sys/class/net/eth${bridge#xenbr}/bridge" ]
then
bridge="eth${bridge#xenbr}"
fi
fi
fi
RET=0
ip link show $bridge 1>/dev/null 2>&1 || RET=1
if [ "$RET" -eq 1 ]
then
fatal "Could not find bridge device $bridge"
fi
case "$command" in
online)
setup_bridge_port "$vif"
add_to_bridge "$bridge" "$vif"
if [ ${bridge} = "eth1" ]; then
do_without_error ifconfig "$vif" mtu 9000
(sleep 10; ifconfig "$vif" mtu 9000) &
(sleep 30; ifconfig "$vif" mtu 9000) &
(sleep 300; ifconfig "$vif" mtu 9000) &
fi
;;
offline)
do_without_error brctl delif "$bridge" "$vif"
do_without_error ifconfig "$vif" down
;;
esac
handle_iptable
log debug "Successful vif-bridge $command for $vif, bridge $bridge."
if [ "$command" == "online" ]
then
success
fi
/etc/xen/xend-config.sxp changed:
(xend-relocation-server yes)
(network-script my-network-bridges)
(vif-script vif-bridge)
(dom0-min-mem 512)
(enable-dom0-ballooning yes)
(total_available_memory 0)
(dom0-cpus 0)
(vncpasswd '')
-- no debconf information
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