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https://github.com/xen-project/xen.git
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Yang Hongyang
c031533480
This patch adds the machinery required for protecting a guest's
disk state, when the guest disk uses a DRBD disk backend.
This patch comprises of two parts:
1. Hotplug scripts: The block-drbd-probe script is responsible for
performing sanity checks on the state of the DRBD disk before the
checkpointing process begins. This script should be invoked by
libxl for each of the guest's disk devices, when starting Remus.
2. Remus drbd disk device: Implements the interfaces required by the
remus abstract device layer. A note about the implementation:
a) setup() is called for each disk attached to the guest.
During setup():
i) The hotplug script is called to perform the sanity check.
ii) Libxl obtains a handle to the DRBD device (/dev/drbd*) and
and subsequently controls disk checkpoint replication using
this handle in the checkpoint callbacks.
c) The preresume() checkpoint callback is executed asynchronously
using libxl__ev_child_fork(), as it may potentially block for more
than few seconds in case of backup failure.
Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
Signed-off-by: Yang Hongyang <yanghy@cn.fujitsu.com>
Signed-off-by: Ian Jackson <Ian.Jackson@eu.citrix.com>
Signed-off-by: Shriram Rajagopalan <rshriram@cs.ubc.ca>
Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>
Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
88 lines
2.0 KiB
Bash
Executable File
88 lines
2.0 KiB
Bash
Executable File
#! /bin/bash
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#
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# Copyright (C) 2014 FUJITSU LIMITED
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#
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of version 2.1 of the GNU Lesser General Public
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# License as published by the Free Software Foundation.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with this library; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#
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# Usage:
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# block-drbd-probe devicename
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#
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# Return value:
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# 0: the device is drbd device
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# 1: the device is not drbd device
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# 2: unkown error
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# 3: the drbd device does not use protocol D
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# 4: the drbd device is not ready
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set -e
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drbd_res=
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function get_res_name()
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{
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local drbd_dev=$1
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local drbd_dev_list=($(drbdadm sh-dev all))
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local drbd_res_list=($(drbdadm sh-resource all))
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local temp_drbd_dev temp_drbd_res
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local found=0
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for temp_drbd_dev in ${drbd_dev_list[@]}; do
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if [[ "$temp_drbd_dev" == "$drbd_dev" ]]; then
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found=1
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break
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fi
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done
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if [[ $found -eq 0 ]]; then
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return 1
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fi
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for temp_drbd_res in ${drbd_res_list[@]}; do
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temp_drbd_dev=$(drbdadm sh-dev $temp_drbd_res)
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if [[ "$temp_drbd_dev" == "$drbd_dev" ]]; then
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drbd_res="$temp_drbd_res"
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return 0
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fi
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done
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# OOPS
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return 2
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}
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get_res_name $1
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rc=$?
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if [[ $rc -ne 0 ]]; then
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exit $rc
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fi
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# check protocol
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drbdsetup $1 show | grep -q "protocol D;"
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if [[ $? -ne 0 ]]; then
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exit 3
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fi
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# check connect status
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state=$(drbdadm cstate "$drbd_res")
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if [[ "$state" != "Connected" ]]; then
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exit 4
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fi
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# check role
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role=$(drbdadm role "$drbd_res")
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if [[ "$role" != "Primary/Secondary" ]]; then
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exit 4
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fi
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exit 0
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