1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
|
from twisted.internet import defer
from xen.xend import sxp
from xen.xend import PrettyPrint
import channel
import controller
from messages import *
class BlkifControllerFactory(controller.ControllerFactory):
"""Factory for creating block device interface controllers.
Also handles the 'back-end' channel to the device driver domain.
"""
def __init__(self):
controller.ControllerFactory.__init__(self)
self.majorTypes = [ CMSG_BLKIF_BE ]
self.subTypes = {
CMSG_BLKIF_BE_CREATE : self.recv_be_create,
CMSG_BLKIF_BE_CONNECT : self.recv_be_connect,
CMSG_BLKIF_BE_VBD_CREATE : self.recv_be_vbd_create,
CMSG_BLKIF_BE_VBD_GROW : self.recv_be_vbd_grow,
CMSG_BLKIF_BE_DRIVER_STATUS_CHANGED: self.recv_be_driver_status_changed,
}
self.attached = 1
self.registerChannel()
def createInstance(self, dom, recreate=0):
d = self.addDeferred()
blkif = self.getInstanceByDom(dom)
if blkif:
self.callDeferred(blkif)
else:
blkif = BlkifController(self, dom)
self.addInstance(blkif)
if recreate:
self.callDeferred(blkif)
else:
blkif.send_be_create()
return d
def getDomainDevices(self, dom):
blkif = self.getInstanceByDom(dom)
return (blkif and blkif.getDevices()) or []
def getDomainDevice(self, dom, vdev):
blkif = self.getInstanceByDom(dom)
return (blkif and blkif.getDevice(vdev)) or None
def setControlDomain(self, dom, recreate=0):
if self.dom == dom: return
self.deregisterChannel()
if not recreate:
self.attached = 0
self.dom = dom
self.registerChannel()
#
#if xend.blkif.be_port:
# xend.blkif.recovery = True
#xend.blkif.be_port = xend.main.port_from_dom(dom)
def getControlDomain(self):
return self.dom
def reattachDevice(self, dom, vdev):
blkif = self.getInstanceByDom(dom)
if blkif:
blkif.reattachDevice(vdev)
self.attached = self.devicesAttached()
if self.attached:
self.reattached()
def devicesAttached(self):
"""Check if all devices are attached.
"""
attached = 1
for blkif in self.getInstances():
if not blkif.attached:
attached = 0
break
return attached
def reattached(self):
for blkif in self.getInstances():
blkif.reattached()
def recv_be_create(self, msg, req):
#print 'recv_be_create>'
val = unpackMsg('blkif_be_create_t', msg)
blkif = self.getInstanceByDom(val['domid'])
self.callDeferred(blkif)
def recv_be_connect(self, msg, req):
#print 'recv_be_create>'
val = unpackMsg('blkif_be_connect_t', msg)
blkif = self.getInstanceByDom(val['domid'])
if blkif:
blkif.send_fe_interface_status_changed()
else:
pass
def recv_be_vbd_create(self, msg, req):
#print 'recv_be_vbd_create>'
val = unpackMsg('blkif_be_vbd_create_t', msg)
blkif = self.getInstanceByDom(val['domid'])
if blkif:
blkif.send_be_vbd_grow(val['vdevice'])
else:
pass
def recv_be_vbd_grow(self, msg, req):
#print 'recv_be_vbd_grow>'
val = unpackMsg('blkif_be_vbd_grow_t', msg)
# Check status?
if self.attached:
self.callDeferred(0)
else:
self.reattachDevice(val['domid'], val['vdevice'])
def recv_be_driver_status_changed(self, msg, req):
val = unpackMsg('blkif_be_driver_status_changed_t', msg)
status = val['status']
if status == BLKIF_DRIVER_STATUS_UP and not self.attached:
for blkif in self.getInstances():
blkif.detach()
class BlkDev(controller.Dev):
"""Info record for a block device.
"""
def __init__(self, ctrl, vdev, mode, segment):
controller.Dev.__init__(self, ctrl)
self.vdev = vdev
self.mode = mode
self.device = segment['device']
self.start_sector = segment['start_sector']
self.nr_sectors = segment['nr_sectors']
self.attached = 1
def readonly(self):
return 'w' not in self.mode
def sxpr(self):
val = ['blkdev', ['vdev', self.vdev], ['mode', self.mode] ]
return val
def destroy(self):
print 'BlkDev>destroy>', self.vdev
PrettyPrint.prettyprint(self.sxpr())
self.controller.send_be_vbd_destroy(self.vdev)
class BlkifController(controller.Controller):
"""Block device interface controller. Handles all block devices
for a domain.
"""
def __init__(self, factory, dom):
#print 'BlkifController> dom=', dom
controller.Controller.__init__(self, factory, dom)
self.devices = {}
self.majorTypes = [ CMSG_BLKIF_FE ]
self.subTypes = {
CMSG_BLKIF_FE_DRIVER_STATUS_CHANGED:
self.recv_fe_driver_status_changed,
CMSG_BLKIF_FE_INTERFACE_CONNECT :
self.recv_fe_interface_connect,
}
self.attached = 1
self.evtchn = None
self.registerChannel()
#print 'BlkifController<', 'dom=', self.dom, 'idx=', self.idx
def sxpr(self):
val = ['blkif', ['dom', self.dom]]
if self.evtchn:
val.append(['evtchn',
self.evtchn['port1'],
self.evtchn['port2']])
return val
def lostChannel(self):
print 'BlkifController>lostChannel>', 'dom=', self.dom
#self.destroyDevices()
controller.Controller.lostChannel(self)
def getDevices(self):
return self.devices.values()
def getDevice(self, vdev):
return self.devices.get(vdev)
def addDevice(self, vdev, mode, segment):
if vdev in self.devices: return None
dev = BlkDev(self, vdev, mode, segment)
self.devices[vdev] = dev
return dev
def attachDevice(self, vdev, mode, segment, recreate=0):
"""Attach a device to the specified interface.
"""
#print 'BlkifController>attach_device>', self.dom, vdev, mode, segment
dev = self.addDevice(vdev, mode, segment)
if not dev: return -1
if recreate:
d = defer.Deferred()
d.callback(self)
else:
self.send_be_vbd_create(vdev)
d = self.factory.addDeferred()
return d
def destroy(self):
print 'BlkifController>destroy> dom=', self.dom
def cb_destroy(val):
self.send_be_destroy()
d = self.factory.addDeferred()
d.addCallback(cb_destroy)
self.send_be_disconnect()
#self.destroyDevices()
def destroyDevices(self):
for dev in self.getDevices():
dev.destroy()
def detach(self):
"""Detach all devices, when the back-end control domain has changed.
"""
self.attached = 0
for dev in self.devices.values():
dev.attached = 0
self.send_be_vbd_create(vdev)
def reattachDevice(self, vdev):
"""Reattach a device, when the back-end control domain has changed.
"""
dev = self.devices[vdev]
dev.attached = 1
attached = 1
for dev in self.devices.values():
if not dev.attached:
attached = 0
break
self.attached = attached
return self.attached
def reattached(self):
"""All devices have been reattached after the back-end control
domain has changed.
"""
msg = packMsg('blkif_fe_interface_status_changed_t',
{ 'handle' : 0,
'status' : BLKIF_INTERFACE_STATUS_DISCONNECTED})
self.writeRequest(msg)
def recv_fe_driver_status_changed(self, msg, req):
msg = packMsg('blkif_fe_interface_status_changed_t',
{ 'handle' : 0,
'status' : BLKIF_INTERFACE_STATUS_DISCONNECTED,
'evtchn' : 0 })
self.writeRequest(msg)
def recv_fe_interface_connect(self, msg, req):
val = unpackMsg('blkif_fe_interface_connect_t', msg)
self.evtchn = channel.eventChannel(0, self.dom)
print 'recv_fe_interface_connect>'
PrettyPrint.prettyprint(self.sxpr())
msg = packMsg('blkif_be_connect_t',
{ 'domid' : self.dom,
'blkif_handle' : val['handle'],
'evtchn' : self.evtchn['port1'],
'shmem_frame' : val['shmem_frame'] })
self.factory.writeRequest(msg)
pass
#def recv_fe_interface_status_changed(self, msg, req):
# (hnd, status, chan) = unpackMsg('blkif_fe_interface_status_changed_t', msg)
# print 'recv_fe_interface_status_changed>', hnd, status, chan
# pass
def send_fe_interface_status_changed(self):
msg = packMsg('blkif_fe_interface_status_changed_t',
{ 'handle' : 0,
'status' : BLKIF_INTERFACE_STATUS_CONNECTED,
'evtchn' : self.evtchn['port2'] })
self.writeRequest(msg)
def send_be_create(self):
msg = packMsg('blkif_be_create_t',
{ 'domid' : self.dom,
'blkif_handle' : 0 })
self.factory.writeRequest(msg)
def send_be_disconnect(self):
print '>BlkifController>send_be_disconnect>', 'dom=', self.dom
msg = packMsg('blkif_be_disconnect_t',
{ 'domid' : self.dom,
'blkif_handle' : 0 })
self.factory.writeRequest(msg)
def send_be_destroy(self):
print '>BlkifController>send_be_destroy>', 'dom=', self.dom
msg = packMsg('blkif_be_destroy_t',
{ 'domid' : self.dom,
'blkif_handle' : 0 })
self.factory.writeRequest(msg)
def send_be_vbd_create(self, vdev):
dev = self.devices[vdev]
msg = packMsg('blkif_be_vbd_create_t',
{ 'domid' : self.dom,
'blkif_handle' : 0,
'vdevice' : dev.vdev,
'readonly' : dev.readonly() })
self.factory.writeRequest(msg)
def send_be_vbd_grow(self, vdev):
dev = self.devices[vdev]
msg = packMsg('blkif_be_vbd_grow_t',
{ 'domid' : self.dom,
'blkif_handle' : 0,
'vdevice' : dev.vdev,
'extent.device' : dev.device,
'extent.sector_start' : dev.start_sector,
'extent.sector_length' : dev.nr_sectors })
self.factory.writeRequest(msg)
def send_be_vbd_destroy(self, vdev):
print '>BlkifController>send_be_vbd_destroy>', 'dom=', self.dom, 'vdev=', vdev
PrettyPrint.prettyprint(self.sxpr())
dev = self.devices[vdev]
msg = packMsg('blkif_be_vbd_destroy_t',
{ 'domid' : self.dom,
'blkif_handle' : 0,
'vdevice' : dev.vdev })
del self.devices[vdev]
self.factory.writeRequest(msg)
|
