# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1277188091 -3600
# Node ID 352739113ccb09e99b1ece056ad0f2f62adaf9eb
# Parent a64cb77277cbc0e13b508afcba592a4d76ad355d
Remus: move device handling into its own module
Signed-off-by: Brendan Cully <brendan@xxxxxxxxx>
xen-unstable changeset: 21240:321dddf767e2
xen-unstable date: Tue May 04 09:34:23 2010 +0100
---
tools/python/xen/remus/device.py | 140 +++++++++++++++++++++++++++++++++++++++
tools/remus/remus | 138 --------------------------------------
2 files changed, 143 insertions(+), 135 deletions(-)
diff -r a64cb77277cb -r 352739113ccb tools/python/xen/remus/device.py
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/tools/python/xen/remus/device.py Tue Jun 22 07:28:11 2010 +0100
@@ -0,0 +1,140 @@
+# Remus device interface
+#
+# Coordinates with devices at suspend, resume, and commit hooks
+
+import os
+
+import netlink, qdisc, util
+
+class CheckpointedDevice(object):
+ 'Base class for buffered devices'
+
+ def postsuspend(self):
+ 'called after guest has suspended'
+ pass
+
+ def preresume(self):
+ 'called before guest resumes'
+ pass
+
+ def commit(self):
+ 'called when backup has acknowledged checkpoint reception'
+ pass
+
+class ReplicatedDiskException(Exception): pass
+
+class ReplicatedDisk(CheckpointedDevice):
+ """
+ Send a checkpoint message to a replicated disk while the domain
+ is paused between epochs.
+ """
+ FIFODIR = '/var/run/tap'
+
+ def __init__(self, disk):
+ # look up disk, make sure it is tap:buffer, and set up socket
+ # to request commits.
+ self.ctlfd = None
+
+ if not disk.uname.startswith('tap:remus:') and not
disk.uname.startswith('tap:tapdisk:remus:'):
+ raise ReplicatedDiskException('Disk is not replicated: %s' %
+ str(disk))
+ fifo = re.match("tap:.*(remus.*)\|", disk.uname).group(1).replace(':',
'_')
+ absfifo = os.path.join(self.FIFODIR, fifo)
+ absmsgfifo = absfifo + '.msg'
+
+ self.installed = False
+ self.ctlfd = open(absfifo, 'w+b')
+ self.msgfd = open(absmsgfifo, 'r+b')
+
+ def __del__(self):
+ self.uninstall()
+
+ def uninstall(self):
+ if self.ctlfd:
+ self.ctlfd.close()
+ self.ctlfd = None
+
+ def postsuspend(self):
+ os.write(self.ctlfd.fileno(), 'flush')
+
+ def commit(self):
+ msg = os.read(self.msgfd.fileno(), 4)
+ if msg != 'done':
+ print 'Unknown message: %s' % msg
+
+class BufferedNICException(Exception): pass
+
+class BufferedNIC(CheckpointedDevice):
+ """
+ Buffer a protected domain's network output between rounds so that
+ nothing is issued that a failover might not know about.
+ """
+ # shared rtnetlink handle
+ rth = None
+
+ def __init__(self, domid):
+ self.installed = False
+
+ if not self.rth:
+ self.rth = netlink.rtnl()
+
+ self.devname = self._startimq(domid)
+ dev = self.rth.getlink(self.devname)
+ if not dev:
+ raise BufferedNICException('could not find device %s' %
self.devname)
+ self.dev = dev['index']
+ self.handle = qdisc.TC_H_ROOT
+ self.q = qdisc.QueueQdisc()
+
+ def __del__(self):
+ self.uninstall()
+
+ def postsuspend(self):
+ if not self.installed:
+ self._setup()
+
+ self._sendqmsg(qdisc.TC_QUEUE_CHECKPOINT)
+
+ def commit(self):
+ '''Called when checkpoint has been acknowledged by
+ the backup'''
+ self._sendqmsg(qdisc.TC_QUEUE_RELEASE)
+
+ def _sendqmsg(self, action):
+ self.q.action = action
+ req = qdisc.changerequest(self.dev, self.handle, self.q)
+ self.rth.talk(req.pack())
+
+ def _setup(self):
+ q = self.rth.getqdisc(self.dev)
+ if q:
+ if q['kind'] == 'queue':
+ self.installed = True
+ return
+ if q['kind'] != 'pfifo_fast':
+ raise BufferedNICException('there is already a queueing '
+ 'discipline on %s' % self.devname)
+
+ print 'installing buffer on %s' % self.devname
+ req = qdisc.addrequest(self.dev, self.handle, self.q)
+ self.rth.talk(req.pack())
+ self.installed = True
+
+ def uninstall(self):
+ if self.installed:
+ req = qdisc.delrequest(self.dev, self.handle)
+ self.rth.talk(req.pack())
+ self.installed = False
+
+ def _startimq(self, domid):
+ # stopgap hack to set up IMQ for an interface. Wrong in many ways.
+ imqebt = '/usr/lib/xen/bin/imqebt'
+ imqdev = 'imq0'
+ vid = 'vif%d.0' % domid
+ for mod in ['sch_queue', 'imq', 'ebt_imq']:
+ util.runcmd(['modprobe', mod])
+ util.runcmd("ip link set %s up" % (imqdev))
+ util.runcmd("%s -F FORWARD" % (imqebt))
+ util.runcmd("%s -A FORWARD -i %s -j imq --todev %s" % (imqebt, vid,
imqdev))
+
+ return imqdev
diff -r a64cb77277cb -r 352739113ccb tools/remus/remus
--- a/tools/remus/remus Tue Jun 22 07:25:45 2010 +0100
+++ b/tools/remus/remus Tue Jun 22 07:28:11 2010 +0100
@@ -7,9 +7,10 @@
# TODO: fencing.
import optparse, os, re, select, signal, sys, time
-from xen.remus import save, vm
+
+from xen.remus import save, util, vm
+from xen.remus.device import ReplicatedDisk, BufferedNIC
from xen.xend import XendOptions
-from xen.remus import netlink, qdisc, util
class CfgException(Exception): pass
@@ -57,139 +58,6 @@ class Cfg(object):
self.domid = args[0]
if (len(args) > 1):
self.host = args[1]
-
-class ReplicatedDiskException(Exception): pass
-
-class BufferedDevice(object):
- 'Base class for buffered devices'
-
- def postsuspend(self):
- 'called after guest has suspended'
- pass
-
- def preresume(self):
- 'called before guest resumes'
- pass
-
- def commit(self):
- 'called when backup has acknowledged checkpoint reception'
- pass
-
-class ReplicatedDisk(BufferedDevice):
- """
- Send a checkpoint message to a replicated disk while the domain
- is paused between epochs.
- """
- FIFODIR = '/var/run/tap'
-
- def __init__(self, disk):
- # look up disk, make sure it is tap:buffer, and set up socket
- # to request commits.
- self.ctlfd = None
-
- if not disk.uname.startswith('tap:remus:') and not
disk.uname.startswith('tap:tapdisk:remus:'):
- raise ReplicatedDiskException('Disk is not replicated: %s' %
- str(disk))
- fifo = re.match("tap:.*(remus.*)\|", disk.uname).group(1).replace(':',
'_')
- absfifo = os.path.join(self.FIFODIR, fifo)
- absmsgfifo = absfifo + '.msg'
-
- self.installed = False
- self.ctlfd = open(absfifo, 'w+b')
- self.msgfd = open(absmsgfifo, 'r+b')
-
- def __del__(self):
- self.uninstall()
-
- def uninstall(self):
- if self.ctlfd:
- self.ctlfd.close()
- self.ctlfd = None
-
- def postsuspend(self):
- os.write(self.ctlfd.fileno(), 'flush')
-
- def commit(self):
- msg = os.read(self.msgfd.fileno(), 4)
- if msg != 'done':
- print 'Unknown message: %s' % msg
-
-class NetbufferException(Exception): pass
-
-class Netbuffer(BufferedDevice):
- """
- Buffer a protected domain's network output between rounds so that
- nothing is issued that a failover might not know about.
- """
- # shared rtnetlink handle
- rth = None
-
- def __init__(self, domid):
- self.installed = False
-
- if not self.rth:
- self.rth = netlink.rtnl()
-
- self.devname = self._startimq(domid)
- dev = self.rth.getlink(self.devname)
- if not dev:
- raise NetbufferException('could not find device %s' % self.devname)
- self.dev = dev['index']
- self.handle = qdisc.TC_H_ROOT
- self.q = qdisc.QueueQdisc()
-
- def __del__(self):
- self.uninstall()
-
- def postsuspend(self):
- if not self.installed:
- self._setup()
-
- self._sendqmsg(qdisc.TC_QUEUE_CHECKPOINT)
-
- def commit(self):
- '''Called when checkpoint has been acknowledged by
- the backup'''
- self._sendqmsg(qdisc.TC_QUEUE_RELEASE)
-
- def _sendqmsg(self, action):
- self.q.action = action
- req = qdisc.changerequest(self.dev, self.handle, self.q)
- self.rth.talk(req.pack())
-
- def _setup(self):
- q = self.rth.getqdisc(self.dev)
- if q:
- if q['kind'] == 'queue':
- self.installed = True
- return
- if q['kind'] != 'pfifo_fast':
- raise NetbufferException('there is already a queueing '
- 'discipline on %s' % self.devname)
-
- print 'installing buffer on %s' % self.devname
- req = qdisc.addrequest(self.dev, self.handle, self.q)
- self.rth.talk(req.pack())
- self.installed = True
-
- def uninstall(self):
- if self.installed:
- req = qdisc.delrequest(self.dev, self.handle)
- self.rth.talk(req.pack())
- self.installed = False
-
- def _startimq(self, domid):
- # stopgap hack to set up IMQ for an interface. Wrong in many ways.
- imqebt = '/usr/lib/xen/bin/imqebt'
- imqdev = 'imq0'
- vid = 'vif%d.0' % domid
- for mod in ['sch_queue', 'imq', 'ebt_imq']:
- util.runcmd(['modprobe', mod])
- util.runcmd("ip link set %s up" % (imqdev))
- util.runcmd("%s -F FORWARD" % (imqebt))
- util.runcmd("%s -A FORWARD -i %s -j imq --todev %s" % (imqebt, vid,
imqdev))
-
- return imqdev
class SignalException(Exception): pass
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