def createDevice(self, config):
uname = config.get('uname', '')
try:
(typ, subtyp, params, file) = string.split(uname, ':', 3)
if subtyp not in ('tapdisk', 'ioemu'):
raise ValueError('invalid subtype')
except:
(typ, params, file) = string.split(uname, ':', 2)
subtyp = 'tapdisk'
if typ in ('tap'):
if subtyp in ('tapdisk', 'ioemu'):
if params not in blktap2_disk_types or \
TapdiskController.check():
# pass this device off to BlktapController
log.warn('WARNING: using deprecated blktap module')
self.deviceClass = 'tap'
devid = BlktapController.createDevice(self, config)
self.deviceClass = 'tap2'
return devid
device = TapdiskController.create(params, file)
# modify the configutration to create a blkback for the underlying
# blktap2 device. Note: we need to preserve the original tapdisk uname
# (it is used during save/restore and for managed domains).
config.update({'tapdisk_uname' : uname})
config.update({'uname' : 'phy:' + device.rstrip()})
devid = BlkifController.createDevice(self, config)
config.update({'uname' : uname})
config.pop('tapdisk_uname')
return devid
def getDeviceDetails(self, config):
(devid, back, front) = BlkifController.getDeviceDetails(self, config)
phantomDevid = 0
wrapped = False
try:
imagetype = self.vm.info['image']['type']
except:
imagetype = ""
if imagetype == 'hvm':
tdevname = back['dev']
index = ['c', 'd', 'e', 'f', 'g', 'h', 'i', \
'j', 'l', 'm', 'n', 'o', 'p']
while True:
global phantomDev
global phantomId
import os, stat
phantomId = phantomId + 1
if phantomId == 16:
if index[phantomDev] == index[-1]:
if wrapped:
raise VmError(" No loopback block \
devices are available. ")
wrapped = True
phantomDev = 0
else:
phantomDev = phantomDev + 1
phantomId = 1
devname = 'xvd%s%d' % (index[phantomDev], phantomId)
try:
info = os.stat('/dev/%s' % devname)
except:
break
vbd = { 'mode': 'w', 'device': devname }
fn = 'tap:%s' % back['params']
# recurse ... by creating the vbd, then fallthrough
# and finish creating the original device
from xen.xend import XendDomain
dom0 = XendDomain.instance().privilegedDomain()
phantomDevid = dom0.create_phantom_vbd_with_vdi(vbd, fn)
# we need to wait for this device at a higher level
# the vbd that gets created will have a link to us
# and will let them do it there
# add a hook to point to the phantom device,
# root path is always the same (dom0 tap)
if phantomDevid != 0:
front['phantom_vbd'] = '/local/domain/0/backend/tap/0/%s' \
% str(phantomDevid)
return (devid, back, front)
def createDevice(self, config):
uname = config.get('uname', '')
try:
(typ, subtyp, params, file) = string.split(uname, ':', 3)
if subtyp not in ('tapdisk', 'ioemu'):
raise ValueError('invalid subtype')
except:
(typ, params, file) = string.split(uname, ':', 2)
subtyp = 'tapdisk'
#check for blktap2 installation.
blktap2_installed=0;
(rc,stdout, stderr) = doexec("cat /proc/devices");
out = stdout.read();
stdout.close();
stderr.close();
if( out.find("blktap2") >= 0 ):
blktap2_installed=1;
if typ in ('tap'):
if subtyp in ('tapdisk', 'ioemu'):
if params not in blktap2_disk_types or not blktap2_installed:
# pass this device off to BlktapController
log.warn('WARNING: using deprecated blktap module')
self.deviceClass = 'tap'
devid = BlktapController.createDevice(self, config)
self.deviceClass = 'tap2'
return devid
if self.vm.image and self.vm.image.memory_sharing:
cmd = [ TAPDISK_BINARY, '-n', '%s:%s' % (params, file), '-s', '%d' % self.vm.getDomid() ]
else:
cmd = [ TAPDISK_BINARY, '-n', '%s:%s' % (params, file) ]
(rc,stdout,stderr) = doexec(cmd)
if rc != 0:
err = stderr.read();
out = stdout.read();
stdout.close();
stderr.close();
raise Exception, 'Failed to create device.\n stdout: %s\n stderr: %s\nCheck that target \"%s\" exists and that blktap2 driver installed in dom0.' % (out.rstrip(), err.rstrip(), file);
minor, device, control = parseDeviceString(stdout.readline())
stdout.close();
stderr.close();
# modify the configutration to create a blkback for the underlying
# blktap2 device. Note: we need to preserve the original tapdisk uname
# (it is used during save/restore and for managed domains).
config.update({'tapdisk_uname' : uname})
config.update({'uname' : 'phy:' + device.rstrip()})
devid = BlkifController.createDevice(self, config)
config.update({'uname' : uname})
config.pop('tapdisk_uname')
return devid
def getDeviceDetails(self, config):
(devid, back, front) = BlkifController.getDeviceDetails(self, config)
phantomDevid = 0
wrapped = False
try:
imagetype = self.vm.info['image']['type']
except:
imagetype = ""
if imagetype == 'hvm':
tdevname = back['dev']
index = ['c', 'd', 'e', 'f', 'g', 'h', 'i', \
'j', 'l', 'm', 'n', 'o', 'p']
while True:
global phantomDev
global phantomId
import os, stat
phantomId = phantomId + 1
if phantomId == 16:
if index[phantomDev] == index[-1]:
if wrapped:
raise VmError(" No loopback block \
devices are available. ")
wrapped = True
phantomDev = 0
else:
phantomDev = phantomDev + 1
phantomId = 1
devname = 'xvd%s%d' % (index[phantomDev], phantomId)
try:
info = os.stat('/dev/%s' % devname)
except:
break
vbd = { 'mode': 'w', 'device': devname }
fn = 'tap:%s' % back['params']
# recurse ... by creating the vbd, then fallthrough
# and finish creating the original device
from xen.xend import XendDomain
dom0 = XendDomain.instance().privilegedDomain()
phantomDevid = dom0.create_phantom_vbd_with_vdi(vbd, fn)
# we need to wait for this device at a higher level
# the vbd that gets created will have a link to us
# and will let them do it there
# add a hook to point to the phantom device,
# root path is always the same (dom0 tap)
if phantomDevid != 0:
front['phantom_vbd'] = '/local/domain/0/backend/tap/0/%s' \
% str(phantomDevid)
return (devid, back, front)
def createDevice(self, config):
uname = config.get('uname', '')
try:
(typ, subtyp, params, file) = string.split(uname, ':', 3)
except:
(typ, params, file) = string.split(uname, ':', 2)
subtyp = 'tapdisk'
#check for blktap2 installation.
blktap2_installed=0;
(rc,stdout, stderr) = doexec("cat /proc/devices");
out = stdout.read();
stdout.close();
stderr.close();
if( out.find("blktap2") >= 0 ):
blktap2_installed=1;
if typ in ('tap'):
if subtyp in ('tapdisk'):
if params not in blktap2_disk_types or not blktap2_installed:
# pass this device off to BlktapController
log.warn('WARNING: using deprecated blktap module')
self.deviceClass = 'tap'
devid = BlktapController.createDevice(self, config)
self.deviceClass = 'tap2'
return devid
cmd = [ TAPDISK_BINARY, '-n', '%s:%s' % (params, file) ]
(rc,stdout,stderr) = doexec(cmd)
if rc != 0:
err = stderr.read();
out = stdout.read();
stdout.close();
stderr.close();
raise Exception, 'Failed to create device.\n stdout: %s\n stderr: %s\nCheck that target \"%s\" exists and that blktap2 driver installed in dom0.' % (out.rstrip(), err.rstrip(), file);
minor, device, control = parseDeviceString(stdout.readline())
stdout.close();
stderr.close();
# modify the configutration to create a blkback for the underlying
# blktap2 device. Note: we need to preserve the original tapdisk uname
# (it is used during save/restore and for managed domains).
config.update({'tapdisk_uname' : uname})
config.update({'uname' : 'phy:' + device.rstrip()})
devid = BlkifController.createDevice(self, config)
config.update({'uname' : uname})
config.pop('tapdisk_uname')
return devid
def __init__(self, vm):
BlkifController.__init__(self, vm)
def __init__(self, vm):
BlkifController.__init__(self, vm)
