/etc/xen/scripts/block-drbd is in drbd-utils 8.9.10-2.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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#
# Copyright (c) 2007 LINBIT Information Technologies GmbH
# Based on the original "block" VBD script by XenSource Inc.
#
# This script implements the "drbd" VBD type. To use a DRBD resource
# as a virtual block device, include a line similar to this in your
# domU configuration:
#
# disk = [ 'drbd:myresource,xvda1,w' ]
#
# This will direct Xen to put the DRBD resource named 'myresource'
# into the Primary role, and configure it as device xvda1 in your
# domU. You may use as many DRBD resources as you like. If you are
# using DRBD in dual-Primary mode (available in DRBD versions 8.0 and
# up), your DRBD-backed domU will be live migration capable.
#
# IMPORTANT: If you run DRBD in dual-Primary mode with Xen, you MUST
# ensure that the only time the resource is accessed by
# both nodes is during domain migration. If you fire up a
# DRBD-backed domU simultaneously on two nodes, you WILL
# wreck your VBD data. DO NOT attempt to set up a live
# migration capable, DRBD-backed domU unless you
# understand these implications.
#
# This script will not load the DRBD kernel module for you, nor will
# it attach, detach, connect, or disconnect your resource. The init
# script distributed with DRBD will do that for you. Make sure it is
# started before attempting to start a DRBD-backed domU.
#
# Known limitations:
#
# - With 'file' and 'phy' VBD's, Xen will allow one block device to be
# made available read-only to multiple domU's, or be mounted
# read-only in the dom0 and be made available read-only to
# domU's. This is not supported by the 'drbd' VBD type.
# - Tested, thus far, only on Debian etch with Xen 3.0.3.
#
# For more information about DRBD, visit http://www.drbd.org/.
#
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of version 2.1 of the GNU Lesser General Public
# License as published by the Free Software Foundation.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
dir=$(dirname "$0")
. "$dir/block-common.sh"
PATH=/usr/sbin:/sbin:$PATH
##
# canonicalise_mode mode
#
# Takes the given mode, which may be r, w, ro, rw, w!, or rw!, or variations
# thereof, and canonicalises them to one of
#
# 'r': perform checks for a new read-only mount;
# 'w': perform checks for a read-write mount; or
# '!': perform no checks at all.
#
canonicalise_mode()
{
local mode="$1"
if ! expr index "$mode" 'w' >/dev/null
then
echo 'r'
elif ! expr index "$mode" '!' >/dev/null
then
echo 'w'
else
echo '!'
fi
}
##
# check_sharing device mode
#
# Check whether the device requested is already in use. To use the device in
# read-only mode, it may be in use in read-only mode, but may not be in use in
# read-write anywhere at all. To use the device in read-write mode, it must
# not be in use anywhere at all.
#
# Prints one of
#
# 'local': the device may not be used because it is mounted in the current
# (i.e. the privileged domain) in a way incompatible with the
# requested mode;
# 'guest': the device may not be used because it already mounted by a guest
# in a way incompatible with the requested mode; or
# 'ok': the device may be used.
#
check_sharing()
{
local dev="$1"
local mode="$2"
local devmm=$(device_major_minor "$dev")
local file
# Here, different from the original 'block' script, we don't check
# explicitly for read/write mounts. See "known limitations" above.
toskip="^$"
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
# Here, different from the original 'block' script, we don't
# check explicitly for read/write mounts. See "known
# limitations" above.
if ! same_vm $dom
then
echo 'guest'
return
fi
fi
done
done
echo 'ok'
}
same_vm()
{
local otherdom="$1"
# Note that othervm can be MISSING here, because Xend will be racing with
# the hotplug scripts -- the entries in /local/domain can be removed by
# Xend before the hotplug scripts have removed the entry in
# /local/domain/0/backend/. In this case, we want to pretend that the
# VM is the same as FRONTEND_UUID, because that way the 'sharing' will be
# allowed.
local othervm=$(xenstore_read_default "/local/domain/$otherdom/vm" \
"$FRONTEND_UUID")
[ "$FRONTEND_UUID" = "$othervm" ]
}
##
# check_device_sharing dev mode
#
# Perform the sharing check for the given physical device and mode.
#
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
}
##
# do_ebusy prefix mode result
#
# Helper function for check_device_sharing check_file_sharing, calling ebusy
# with an error message constructed from the given prefix, mode, and result
# from a call to check_sharing.
#
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
case $t in
drbd|phy)
drbd_resource=$p
drbd_role="$(drbdadm role $drbd_resource)"
drbd_lrole="${drbd_role%%/*}"
drbd_dev="$(drbdadm sh-dev $drbd_resource)"
if [ "$drbd_lrole" != 'Primary' ]; then
drbdadm primary $drbd_resource
fi
dev=$drbd_dev
FRONTEND_ID=$(xenstore_read "$XENBUS_PATH/frontend-id")
FRONTEND_UUID=$(xenstore_read_default \
"/local/domain/$FRONTEND_ID/vm" 'unknown')
claim_lock "block"
check_device_sharing "$dev" "$mode"
write_dev "$dev"
release_lock "block"
exit 0
;;
"")
claim_lock "block"
success
release_lock "block"
;;
esac
;;
remove)
case $t in
drbd|phy)
p=$(xenstore_read "$XENBUS_PATH/params")
drbd_resource=$p
drbd_role="$(drbdadm role $drbd_resource)"
drbd_lrole="${drbd_role%%/*}"
drbd_dev="$(drbdadm sh-dev $drbd_resource)"
if [ "$drbd_lrole" != 'Secondary' ]; then
drbdadm secondary $drbd_resource
fi
exit 0
;;
"")
exit 0
;;
esac
;;
esac
|