root / lib / bdev.py @ e739bd57
History | View | Annotate | Download (69.1 kB)
1 |
#
|
---|---|
2 |
#
|
3 |
|
4 |
# Copyright (C) 2006, 2007 Google Inc.
|
5 |
#
|
6 |
# This program is free software; you can redistribute it and/or modify
|
7 |
# it under the terms of the GNU General Public License as published by
|
8 |
# the Free Software Foundation; either version 2 of the License, or
|
9 |
# (at your option) any later version.
|
10 |
#
|
11 |
# This program is distributed in the hope that it will be useful, but
|
12 |
# WITHOUT ANY WARRANTY; without even the implied warranty of
|
13 |
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
14 |
# General Public License for more details.
|
15 |
#
|
16 |
# You should have received a copy of the GNU General Public License
|
17 |
# along with this program; if not, write to the Free Software
|
18 |
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
|
19 |
# 02110-1301, USA.
|
20 |
|
21 |
|
22 |
"""Block device abstraction"""
|
23 |
|
24 |
import re |
25 |
import time |
26 |
import errno |
27 |
import pyparsing as pyp |
28 |
|
29 |
from ganeti import utils |
30 |
from ganeti import logger |
31 |
from ganeti import errors |
32 |
from ganeti import constants |
33 |
|
34 |
|
35 |
class BlockDev(object): |
36 |
"""Block device abstract class.
|
37 |
|
38 |
A block device can be in the following states:
|
39 |
- not existing on the system, and by `Create()` it goes into:
|
40 |
- existing but not setup/not active, and by `Assemble()` goes into:
|
41 |
- active read-write and by `Open()` it goes into
|
42 |
- online (=used, or ready for use)
|
43 |
|
44 |
A device can also be online but read-only, however we are not using
|
45 |
the readonly state (MD and LV have it, if needed in the future)
|
46 |
and we are usually looking at this like at a stack, so it's easier
|
47 |
to conceptualise the transition from not-existing to online and back
|
48 |
like a linear one.
|
49 |
|
50 |
The many different states of the device are due to the fact that we
|
51 |
need to cover many device types:
|
52 |
- logical volumes are created, lvchange -a y $lv, and used
|
53 |
- md arrays are created or assembled and used
|
54 |
- drbd devices are attached to a local disk/remote peer and made primary
|
55 |
|
56 |
The status of the device can be examined by `GetStatus()`, which
|
57 |
returns a numerical value, depending on the position in the
|
58 |
transition stack of the device.
|
59 |
|
60 |
A block device is identified by three items:
|
61 |
- the /dev path of the device (dynamic)
|
62 |
- a unique ID of the device (static)
|
63 |
- it's major/minor pair (dynamic)
|
64 |
|
65 |
Not all devices implement both the first two as distinct items. LVM
|
66 |
logical volumes have their unique ID (the pair volume group, logical
|
67 |
volume name) in a 1-to-1 relation to the dev path. For MD devices,
|
68 |
the /dev path is dynamic and the unique ID is the UUID generated at
|
69 |
array creation plus the slave list. For DRBD devices, the /dev path
|
70 |
is again dynamic and the unique id is the pair (host1, dev1),
|
71 |
(host2, dev2).
|
72 |
|
73 |
You can get to a device in two ways:
|
74 |
- creating the (real) device, which returns you
|
75 |
an attached instance (lvcreate, mdadm --create)
|
76 |
- attaching of a python instance to an existing (real) device
|
77 |
|
78 |
The second point, the attachement to a device, is different
|
79 |
depending on whether the device is assembled or not. At init() time,
|
80 |
we search for a device with the same unique_id as us. If found,
|
81 |
good. It also means that the device is already assembled. If not,
|
82 |
after assembly we'll have our correct major/minor.
|
83 |
|
84 |
"""
|
85 |
STATUS_UNKNOWN = 0
|
86 |
STATUS_EXISTING = 1
|
87 |
STATUS_STANDBY = 2
|
88 |
STATUS_ONLINE = 3
|
89 |
|
90 |
STATUS_MAP = { |
91 |
STATUS_UNKNOWN: "unknown",
|
92 |
STATUS_EXISTING: "existing",
|
93 |
STATUS_STANDBY: "ready for use",
|
94 |
STATUS_ONLINE: "online",
|
95 |
} |
96 |
|
97 |
def __init__(self, unique_id, children): |
98 |
self._children = children
|
99 |
self.dev_path = None |
100 |
self.unique_id = unique_id
|
101 |
self.major = None |
102 |
self.minor = None |
103 |
|
104 |
def Assemble(self): |
105 |
"""Assemble the device from its components.
|
106 |
|
107 |
If this is a plain block device (e.g. LVM) than assemble does
|
108 |
nothing, as the LVM has no children and we don't put logical
|
109 |
volumes offline.
|
110 |
|
111 |
One guarantee is that after the device has been assembled, it
|
112 |
knows its major/minor numbers. This allows other devices (usually
|
113 |
parents) to probe correctly for their children.
|
114 |
|
115 |
"""
|
116 |
status = True
|
117 |
for child in self._children: |
118 |
if not isinstance(child, BlockDev): |
119 |
raise TypeError("Invalid child passed of type '%s'" % type(child)) |
120 |
if not status: |
121 |
break
|
122 |
status = status and child.Assemble()
|
123 |
if not status: |
124 |
break
|
125 |
status = status and child.Open()
|
126 |
|
127 |
if not status: |
128 |
for child in self._children: |
129 |
child.Shutdown() |
130 |
return status
|
131 |
|
132 |
def Attach(self): |
133 |
"""Find a device which matches our config and attach to it.
|
134 |
|
135 |
"""
|
136 |
raise NotImplementedError |
137 |
|
138 |
def Close(self): |
139 |
"""Notifies that the device will no longer be used for I/O.
|
140 |
|
141 |
"""
|
142 |
raise NotImplementedError |
143 |
|
144 |
@classmethod
|
145 |
def Create(cls, unique_id, children, size): |
146 |
"""Create the device.
|
147 |
|
148 |
If the device cannot be created, it will return None
|
149 |
instead. Error messages go to the logging system.
|
150 |
|
151 |
Note that for some devices, the unique_id is used, and for other,
|
152 |
the children. The idea is that these two, taken together, are
|
153 |
enough for both creation and assembly (later).
|
154 |
|
155 |
"""
|
156 |
raise NotImplementedError |
157 |
|
158 |
def Remove(self): |
159 |
"""Remove this device.
|
160 |
|
161 |
This makes sense only for some of the device types: LV and to a
|
162 |
lesser degree, md devices. Also note that if the device can't
|
163 |
attach, the removal can't be completed.
|
164 |
|
165 |
"""
|
166 |
raise NotImplementedError |
167 |
|
168 |
def Rename(self, new_id): |
169 |
"""Rename this device.
|
170 |
|
171 |
This may or may not make sense for a given device type.
|
172 |
|
173 |
"""
|
174 |
raise NotImplementedError |
175 |
|
176 |
def GetStatus(self): |
177 |
"""Return the status of the device.
|
178 |
|
179 |
"""
|
180 |
raise NotImplementedError |
181 |
|
182 |
def Open(self, force=False): |
183 |
"""Make the device ready for use.
|
184 |
|
185 |
This makes the device ready for I/O. For now, just the DRBD
|
186 |
devices need this.
|
187 |
|
188 |
The force parameter signifies that if the device has any kind of
|
189 |
--force thing, it should be used, we know what we are doing.
|
190 |
|
191 |
"""
|
192 |
raise NotImplementedError |
193 |
|
194 |
def Shutdown(self): |
195 |
"""Shut down the device, freeing its children.
|
196 |
|
197 |
This undoes the `Assemble()` work, except for the child
|
198 |
assembling; as such, the children on the device are still
|
199 |
assembled after this call.
|
200 |
|
201 |
"""
|
202 |
raise NotImplementedError |
203 |
|
204 |
def SetSyncSpeed(self, speed): |
205 |
"""Adjust the sync speed of the mirror.
|
206 |
|
207 |
In case this is not a mirroring device, this is no-op.
|
208 |
|
209 |
"""
|
210 |
result = True
|
211 |
if self._children: |
212 |
for child in self._children: |
213 |
result = result and child.SetSyncSpeed(speed)
|
214 |
return result
|
215 |
|
216 |
def GetSyncStatus(self): |
217 |
"""Returns the sync status of the device.
|
218 |
|
219 |
If this device is a mirroring device, this function returns the
|
220 |
status of the mirror.
|
221 |
|
222 |
Returns:
|
223 |
(sync_percent, estimated_time, is_degraded)
|
224 |
|
225 |
If sync_percent is None, it means all is ok
|
226 |
If estimated_time is None, it means we can't estimate
|
227 |
the time needed, otherwise it's the time left in seconds
|
228 |
If is_degraded is True, it means the device is missing
|
229 |
redundancy. This is usually a sign that something went wrong in
|
230 |
the device setup, if sync_percent is None.
|
231 |
|
232 |
"""
|
233 |
return None, None, False |
234 |
|
235 |
|
236 |
def CombinedSyncStatus(self): |
237 |
"""Calculate the mirror status recursively for our children.
|
238 |
|
239 |
The return value is the same as for `GetSyncStatus()` except the
|
240 |
minimum percent and maximum time are calculated across our
|
241 |
children.
|
242 |
|
243 |
"""
|
244 |
min_percent, max_time, is_degraded = self.GetSyncStatus()
|
245 |
if self._children: |
246 |
for child in self._children: |
247 |
c_percent, c_time, c_degraded = child.GetSyncStatus() |
248 |
if min_percent is None: |
249 |
min_percent = c_percent |
250 |
elif c_percent is not None: |
251 |
min_percent = min(min_percent, c_percent)
|
252 |
if max_time is None: |
253 |
max_time = c_time |
254 |
elif c_time is not None: |
255 |
max_time = max(max_time, c_time)
|
256 |
is_degraded = is_degraded or c_degraded
|
257 |
return min_percent, max_time, is_degraded
|
258 |
|
259 |
|
260 |
def SetInfo(self, text): |
261 |
"""Update metadata with info text.
|
262 |
|
263 |
Only supported for some device types.
|
264 |
|
265 |
"""
|
266 |
for child in self._children: |
267 |
child.SetInfo(text) |
268 |
|
269 |
|
270 |
def __repr__(self): |
271 |
return ("<%s: unique_id: %s, children: %s, %s:%s, %s>" % |
272 |
(self.__class__, self.unique_id, self._children, |
273 |
self.major, self.minor, self.dev_path)) |
274 |
|
275 |
|
276 |
class LogicalVolume(BlockDev): |
277 |
"""Logical Volume block device.
|
278 |
|
279 |
"""
|
280 |
def __init__(self, unique_id, children): |
281 |
"""Attaches to a LV device.
|
282 |
|
283 |
The unique_id is a tuple (vg_name, lv_name)
|
284 |
|
285 |
"""
|
286 |
super(LogicalVolume, self).__init__(unique_id, children) |
287 |
if not isinstance(unique_id, (tuple, list)) or len(unique_id) != 2: |
288 |
raise ValueError("Invalid configuration data %s" % str(unique_id)) |
289 |
self._vg_name, self._lv_name = unique_id |
290 |
self.dev_path = "/dev/%s/%s" % (self._vg_name, self._lv_name) |
291 |
self.Attach()
|
292 |
|
293 |
@classmethod
|
294 |
def Create(cls, unique_id, children, size): |
295 |
"""Create a new logical volume.
|
296 |
|
297 |
"""
|
298 |
if not isinstance(unique_id, (tuple, list)) or len(unique_id) != 2: |
299 |
raise ValueError("Invalid configuration data %s" % str(unique_id)) |
300 |
vg_name, lv_name = unique_id |
301 |
pvs_info = cls.GetPVInfo(vg_name) |
302 |
if not pvs_info: |
303 |
raise errors.BlockDeviceError("Can't compute PV info for vg %s" % |
304 |
vg_name) |
305 |
pvs_info.sort() |
306 |
pvs_info.reverse() |
307 |
|
308 |
pvlist = [ pv[1] for pv in pvs_info ] |
309 |
free_size = sum([ pv[0] for pv in pvs_info ]) |
310 |
|
311 |
# The size constraint should have been checked from the master before
|
312 |
# calling the create function.
|
313 |
if free_size < size:
|
314 |
raise errors.BlockDeviceError("Not enough free space: required %s," |
315 |
" available %s" % (size, free_size))
|
316 |
result = utils.RunCmd(["lvcreate", "-L%dm" % size, "-n%s" % lv_name, |
317 |
vg_name] + pvlist) |
318 |
if result.failed:
|
319 |
raise errors.BlockDeviceError(result.fail_reason)
|
320 |
return LogicalVolume(unique_id, children)
|
321 |
|
322 |
@staticmethod
|
323 |
def GetPVInfo(vg_name): |
324 |
"""Get the free space info for PVs in a volume group.
|
325 |
|
326 |
Args:
|
327 |
vg_name: the volume group name
|
328 |
|
329 |
Returns:
|
330 |
list of (free_space, name) with free_space in mebibytes
|
331 |
|
332 |
"""
|
333 |
command = ["pvs", "--noheadings", "--nosuffix", "--units=m", |
334 |
"-opv_name,vg_name,pv_free,pv_attr", "--unbuffered", |
335 |
"--separator=:"]
|
336 |
result = utils.RunCmd(command) |
337 |
if result.failed:
|
338 |
logger.Error("Can't get the PV information: %s" % result.fail_reason)
|
339 |
return None |
340 |
data = [] |
341 |
for line in result.stdout.splitlines(): |
342 |
fields = line.strip().split(':')
|
343 |
if len(fields) != 4: |
344 |
logger.Error("Can't parse pvs output: line '%s'" % line)
|
345 |
return None |
346 |
# skip over pvs from another vg or ones which are not allocatable
|
347 |
if fields[1] != vg_name or fields[3][0] != 'a': |
348 |
continue
|
349 |
data.append((float(fields[2]), fields[0])) |
350 |
|
351 |
return data
|
352 |
|
353 |
def Remove(self): |
354 |
"""Remove this logical volume.
|
355 |
|
356 |
"""
|
357 |
if not self.minor and not self.Attach(): |
358 |
# the LV does not exist
|
359 |
return True |
360 |
result = utils.RunCmd(["lvremove", "-f", "%s/%s" % |
361 |
(self._vg_name, self._lv_name)]) |
362 |
if result.failed:
|
363 |
logger.Error("Can't lvremove: %s" % result.fail_reason)
|
364 |
|
365 |
return not result.failed |
366 |
|
367 |
def Rename(self, new_id): |
368 |
"""Rename this logical volume.
|
369 |
|
370 |
"""
|
371 |
if not isinstance(new_id, (tuple, list)) or len(new_id) != 2: |
372 |
raise errors.ProgrammerError("Invalid new logical id '%s'" % new_id) |
373 |
new_vg, new_name = new_id |
374 |
if new_vg != self._vg_name: |
375 |
raise errors.ProgrammerError("Can't move a logical volume across" |
376 |
" volume groups (from %s to to %s)" %
|
377 |
(self._vg_name, new_vg))
|
378 |
result = utils.RunCmd(["lvrename", new_vg, self._lv_name, new_name]) |
379 |
if result.failed:
|
380 |
raise errors.BlockDeviceError("Failed to rename the logical volume: %s" % |
381 |
result.output) |
382 |
self._lv_name = new_name
|
383 |
self.dev_path = "/dev/%s/%s" % (self._vg_name, self._lv_name) |
384 |
|
385 |
|
386 |
def Attach(self): |
387 |
"""Attach to an existing LV.
|
388 |
|
389 |
This method will try to see if an existing and active LV exists
|
390 |
which matches the our name. If so, its major/minor will be
|
391 |
recorded.
|
392 |
|
393 |
"""
|
394 |
result = utils.RunCmd(["lvdisplay", self.dev_path]) |
395 |
if result.failed:
|
396 |
logger.Error("Can't find LV %s: %s" %
|
397 |
(self.dev_path, result.fail_reason))
|
398 |
return False |
399 |
match = re.compile("^ *Block device *([0-9]+):([0-9]+).*$")
|
400 |
for line in result.stdout.splitlines(): |
401 |
match_result = match.match(line) |
402 |
if match_result:
|
403 |
self.major = int(match_result.group(1)) |
404 |
self.minor = int(match_result.group(2)) |
405 |
return True |
406 |
return False |
407 |
|
408 |
def Assemble(self): |
409 |
"""Assemble the device.
|
410 |
|
411 |
This is a no-op for the LV device type. Eventually, we could
|
412 |
lvchange -ay here if we see that the LV is not active.
|
413 |
|
414 |
"""
|
415 |
return True |
416 |
|
417 |
def Shutdown(self): |
418 |
"""Shutdown the device.
|
419 |
|
420 |
This is a no-op for the LV device type, as we don't deactivate the
|
421 |
volumes on shutdown.
|
422 |
|
423 |
"""
|
424 |
return True |
425 |
|
426 |
def GetStatus(self): |
427 |
"""Return the status of the device.
|
428 |
|
429 |
Logical volumes will can be in all four states, although we don't
|
430 |
deactivate (lvchange -an) them when shutdown, so STATUS_EXISTING
|
431 |
should not be seen for our devices.
|
432 |
|
433 |
"""
|
434 |
result = utils.RunCmd(["lvs", "--noheadings", "-olv_attr", self.dev_path]) |
435 |
if result.failed:
|
436 |
logger.Error("Can't display lv: %s" % result.fail_reason)
|
437 |
return self.STATUS_UNKNOWN |
438 |
out = result.stdout.strip() |
439 |
# format: type/permissions/alloc/fixed_minor/state/open
|
440 |
if len(out) != 6: |
441 |
return self.STATUS_UNKNOWN |
442 |
#writable = (out[1] == "w")
|
443 |
active = (out[4] == "a") |
444 |
online = (out[5] == "o") |
445 |
if online:
|
446 |
retval = self.STATUS_ONLINE
|
447 |
elif active:
|
448 |
retval = self.STATUS_STANDBY
|
449 |
else:
|
450 |
retval = self.STATUS_EXISTING
|
451 |
|
452 |
return retval
|
453 |
|
454 |
def Open(self, force=False): |
455 |
"""Make the device ready for I/O.
|
456 |
|
457 |
This is a no-op for the LV device type.
|
458 |
|
459 |
"""
|
460 |
return True |
461 |
|
462 |
def Close(self): |
463 |
"""Notifies that the device will no longer be used for I/O.
|
464 |
|
465 |
This is a no-op for the LV device type.
|
466 |
|
467 |
"""
|
468 |
return True |
469 |
|
470 |
def Snapshot(self, size): |
471 |
"""Create a snapshot copy of an lvm block device.
|
472 |
|
473 |
"""
|
474 |
snap_name = self._lv_name + ".snap" |
475 |
|
476 |
# remove existing snapshot if found
|
477 |
snap = LogicalVolume((self._vg_name, snap_name), None) |
478 |
snap.Remove() |
479 |
|
480 |
pvs_info = self.GetPVInfo(self._vg_name) |
481 |
if not pvs_info: |
482 |
raise errors.BlockDeviceError("Can't compute PV info for vg %s" % |
483 |
self._vg_name)
|
484 |
pvs_info.sort() |
485 |
pvs_info.reverse() |
486 |
free_size, pv_name = pvs_info[0]
|
487 |
if free_size < size:
|
488 |
raise errors.BlockDeviceError("Not enough free space: required %s," |
489 |
" available %s" % (size, free_size))
|
490 |
|
491 |
result = utils.RunCmd(["lvcreate", "-L%dm" % size, "-s", |
492 |
"-n%s" % snap_name, self.dev_path]) |
493 |
if result.failed:
|
494 |
raise errors.BlockDeviceError("command: %s error: %s" % |
495 |
(result.cmd, result.fail_reason)) |
496 |
|
497 |
return snap_name
|
498 |
|
499 |
def SetInfo(self, text): |
500 |
"""Update metadata with info text.
|
501 |
|
502 |
"""
|
503 |
BlockDev.SetInfo(self, text)
|
504 |
|
505 |
# Replace invalid characters
|
506 |
text = re.sub('^[^A-Za-z0-9_+.]', '_', text) |
507 |
text = re.sub('[^-A-Za-z0-9_+.]', '_', text) |
508 |
|
509 |
# Only up to 128 characters are allowed
|
510 |
text = text[:128]
|
511 |
|
512 |
result = utils.RunCmd(["lvchange", "--addtag", text, |
513 |
self.dev_path])
|
514 |
if result.failed:
|
515 |
raise errors.BlockDeviceError("Command: %s error: %s" % |
516 |
(result.cmd, result.fail_reason)) |
517 |
|
518 |
|
519 |
class MDRaid1(BlockDev): |
520 |
"""raid1 device implemented via md.
|
521 |
|
522 |
"""
|
523 |
def __init__(self, unique_id, children): |
524 |
super(MDRaid1, self).__init__(unique_id, children) |
525 |
self.major = 9 |
526 |
self.Attach()
|
527 |
|
528 |
def Attach(self): |
529 |
"""Find an array which matches our config and attach to it.
|
530 |
|
531 |
This tries to find a MD array which has the same UUID as our own.
|
532 |
|
533 |
"""
|
534 |
minor = self._FindMDByUUID(self.unique_id) |
535 |
if minor is not None: |
536 |
self._SetFromMinor(minor)
|
537 |
else:
|
538 |
self.minor = None |
539 |
self.dev_path = None |
540 |
|
541 |
return (minor is not None) |
542 |
|
543 |
@staticmethod
|
544 |
def _GetUsedDevs(): |
545 |
"""Compute the list of in-use MD devices.
|
546 |
|
547 |
It doesn't matter if the used device have other raid level, just
|
548 |
that they are in use.
|
549 |
|
550 |
"""
|
551 |
mdstat = open("/proc/mdstat", "r") |
552 |
data = mdstat.readlines() |
553 |
mdstat.close() |
554 |
|
555 |
used_md = {} |
556 |
valid_line = re.compile("^md([0-9]+) : .*$")
|
557 |
for line in data: |
558 |
match = valid_line.match(line) |
559 |
if match:
|
560 |
md_no = int(match.group(1)) |
561 |
used_md[md_no] = line |
562 |
|
563 |
return used_md
|
564 |
|
565 |
@staticmethod
|
566 |
def _GetDevInfo(minor): |
567 |
"""Get info about a MD device.
|
568 |
|
569 |
Currently only uuid is returned.
|
570 |
|
571 |
"""
|
572 |
result = utils.RunCmd(["mdadm", "-D", "/dev/md%d" % minor]) |
573 |
if result.failed:
|
574 |
logger.Error("Can't display md: %s" % result.fail_reason)
|
575 |
return None |
576 |
retval = {} |
577 |
for line in result.stdout.splitlines(): |
578 |
line = line.strip() |
579 |
kv = line.split(" : ", 1) |
580 |
if kv:
|
581 |
if kv[0] == "UUID": |
582 |
retval["uuid"] = kv[1].split()[0] |
583 |
elif kv[0] == "State": |
584 |
retval["state"] = kv[1].split(", ") |
585 |
return retval
|
586 |
|
587 |
@staticmethod
|
588 |
def _FindUnusedMinor(): |
589 |
"""Compute an unused MD minor.
|
590 |
|
591 |
This code assumes that there are 256 minors only.
|
592 |
|
593 |
"""
|
594 |
used_md = MDRaid1._GetUsedDevs() |
595 |
i = 0
|
596 |
while i < 256: |
597 |
if i not in used_md: |
598 |
break
|
599 |
i += 1
|
600 |
if i == 256: |
601 |
logger.Error("Critical: Out of md minor numbers.")
|
602 |
raise errors.BlockDeviceError("Can't find a free MD minor") |
603 |
return i
|
604 |
|
605 |
@classmethod
|
606 |
def _FindMDByUUID(cls, uuid): |
607 |
"""Find the minor of an MD array with a given UUID.
|
608 |
|
609 |
"""
|
610 |
md_list = cls._GetUsedDevs() |
611 |
for minor in md_list: |
612 |
info = cls._GetDevInfo(minor) |
613 |
if info and info["uuid"] == uuid: |
614 |
return minor
|
615 |
return None |
616 |
|
617 |
@staticmethod
|
618 |
def _ZeroSuperblock(dev_path): |
619 |
"""Zero the possible locations for an MD superblock.
|
620 |
|
621 |
The zero-ing can't be done via ``mdadm --zero-superblock`` as that
|
622 |
fails in versions 2.x with the same error code as non-writable
|
623 |
device.
|
624 |
|
625 |
The superblocks are located at (negative values are relative to
|
626 |
the end of the block device):
|
627 |
- -128k to end for version 0.90 superblock
|
628 |
- -8k to -12k for version 1.0 superblock (included in the above)
|
629 |
- 0k to 4k for version 1.1 superblock
|
630 |
- 4k to 8k for version 1.2 superblock
|
631 |
|
632 |
To cover all situations, the zero-ing will be:
|
633 |
- 0k to 128k
|
634 |
- -128k to end
|
635 |
|
636 |
As such, the minimum device size must be 128k, otherwise we'll get
|
637 |
I/O errors.
|
638 |
|
639 |
Note that this function depends on the fact that one can open,
|
640 |
read and write block devices normally.
|
641 |
|
642 |
"""
|
643 |
overwrite_size = 128 * 1024 |
644 |
empty_buf = '\0' * overwrite_size
|
645 |
fd = open(dev_path, "r+") |
646 |
try:
|
647 |
fd.seek(0, 0) |
648 |
p1 = fd.tell() |
649 |
fd.write(empty_buf) |
650 |
p2 = fd.tell() |
651 |
logger.Debug("Zeroed %s from %d to %d" % (dev_path, p1, p2))
|
652 |
fd.seek(-overwrite_size, 2)
|
653 |
p1 = fd.tell() |
654 |
fd.write(empty_buf) |
655 |
p2 = fd.tell() |
656 |
logger.Debug("Zeroed %s from %d to %d" % (dev_path, p1, p2))
|
657 |
finally:
|
658 |
fd.close() |
659 |
|
660 |
@classmethod
|
661 |
def Create(cls, unique_id, children, size): |
662 |
"""Create a new MD raid1 array.
|
663 |
|
664 |
"""
|
665 |
if not isinstance(children, (tuple, list)): |
666 |
raise ValueError("Invalid setup data for MDRaid1 dev: %s" % |
667 |
str(children))
|
668 |
for i in children: |
669 |
if not isinstance(i, BlockDev): |
670 |
raise ValueError("Invalid member in MDRaid1 dev: %s" % type(i)) |
671 |
for i in children: |
672 |
try:
|
673 |
cls._ZeroSuperblock(i.dev_path) |
674 |
except EnvironmentError, err: |
675 |
logger.Error("Can't zero superblock for %s: %s" %
|
676 |
(i.dev_path, str(err)))
|
677 |
return None |
678 |
minor = cls._FindUnusedMinor() |
679 |
result = utils.RunCmd(["mdadm", "--create", "/dev/md%d" % minor, |
680 |
"--auto=yes", "--force", "-l1", |
681 |
"-n%d" % len(children)] + |
682 |
[dev.dev_path for dev in children]) |
683 |
|
684 |
if result.failed:
|
685 |
logger.Error("Can't create md: %s: %s" % (result.fail_reason,
|
686 |
result.output)) |
687 |
return None |
688 |
info = cls._GetDevInfo(minor) |
689 |
if not info or not "uuid" in info: |
690 |
logger.Error("Wrong information returned from mdadm -D: %s" % str(info)) |
691 |
return None |
692 |
return MDRaid1(info["uuid"], children) |
693 |
|
694 |
def Remove(self): |
695 |
"""Stub remove function for MD RAID 1 arrays.
|
696 |
|
697 |
We don't remove the superblock right now. Mark a to do.
|
698 |
|
699 |
"""
|
700 |
#TODO: maybe zero superblock on child devices?
|
701 |
return self.Shutdown() |
702 |
|
703 |
def Rename(self, new_id): |
704 |
"""Rename a device.
|
705 |
|
706 |
This is not supported for md raid1 devices.
|
707 |
|
708 |
"""
|
709 |
raise errors.ProgrammerError("Can't rename a md raid1 device") |
710 |
|
711 |
def AddChildren(self, devices): |
712 |
"""Add new member(s) to the md raid1.
|
713 |
|
714 |
"""
|
715 |
if self.minor is None and not self.Attach(): |
716 |
raise errors.BlockDeviceError("Can't attach to device") |
717 |
|
718 |
args = ["mdadm", "-a", self.dev_path] |
719 |
for dev in devices: |
720 |
if dev.dev_path is None: |
721 |
raise errors.BlockDeviceError("Child '%s' is not initialised" % dev) |
722 |
dev.Open() |
723 |
args.append(dev.dev_path) |
724 |
result = utils.RunCmd(args) |
725 |
if result.failed:
|
726 |
raise errors.BlockDeviceError("Failed to add new device to array: %s" % |
727 |
result.output) |
728 |
new_len = len(self._children) + len(devices) |
729 |
result = utils.RunCmd(["mdadm", "--grow", self.dev_path, "-n", new_len]) |
730 |
if result.failed:
|
731 |
raise errors.BlockDeviceError("Can't grow md array: %s" % |
732 |
result.output) |
733 |
self._children.extend(devices)
|
734 |
|
735 |
def RemoveChildren(self, devices): |
736 |
"""Remove member(s) from the md raid1.
|
737 |
|
738 |
"""
|
739 |
if self.minor is None and not self.Attach(): |
740 |
raise errors.BlockDeviceError("Can't attach to device") |
741 |
new_len = len(self._children) - len(devices) |
742 |
if new_len < 1: |
743 |
raise errors.BlockDeviceError("Can't reduce to less than one child") |
744 |
args = ["mdadm", "-f", self.dev_path] |
745 |
orig_devs = [] |
746 |
for dev in devices: |
747 |
args.append(dev) |
748 |
for c in self._children: |
749 |
if c.dev_path == dev:
|
750 |
orig_devs.append(c) |
751 |
break
|
752 |
else:
|
753 |
raise errors.BlockDeviceError("Can't find device '%s' for removal" % |
754 |
dev) |
755 |
result = utils.RunCmd(args) |
756 |
if result.failed:
|
757 |
raise errors.BlockDeviceError("Failed to mark device(s) as failed: %s" % |
758 |
result.output) |
759 |
|
760 |
# it seems here we need a short delay for MD to update its
|
761 |
# superblocks
|
762 |
time.sleep(0.5)
|
763 |
args[1] = "-r" |
764 |
result = utils.RunCmd(args) |
765 |
if result.failed:
|
766 |
raise errors.BlockDeviceError("Failed to remove device(s) from array:" |
767 |
" %s" % result.output)
|
768 |
result = utils.RunCmd(["mdadm", "--grow", "--force", self.dev_path, |
769 |
"-n", new_len])
|
770 |
if result.failed:
|
771 |
raise errors.BlockDeviceError("Can't shrink md array: %s" % |
772 |
result.output) |
773 |
for dev in orig_devs: |
774 |
self._children.remove(dev)
|
775 |
|
776 |
def GetStatus(self): |
777 |
"""Return the status of the device.
|
778 |
|
779 |
"""
|
780 |
self.Attach()
|
781 |
if self.minor is None: |
782 |
retval = self.STATUS_UNKNOWN
|
783 |
else:
|
784 |
retval = self.STATUS_ONLINE
|
785 |
return retval
|
786 |
|
787 |
def _SetFromMinor(self, minor): |
788 |
"""Set our parameters based on the given minor.
|
789 |
|
790 |
This sets our minor variable and our dev_path.
|
791 |
|
792 |
"""
|
793 |
self.minor = minor
|
794 |
self.dev_path = "/dev/md%d" % minor |
795 |
|
796 |
def Assemble(self): |
797 |
"""Assemble the MD device.
|
798 |
|
799 |
At this point we should have:
|
800 |
- list of children devices
|
801 |
- uuid
|
802 |
|
803 |
"""
|
804 |
result = super(MDRaid1, self).Assemble() |
805 |
if not result: |
806 |
return result
|
807 |
md_list = self._GetUsedDevs()
|
808 |
for minor in md_list: |
809 |
info = self._GetDevInfo(minor)
|
810 |
if info and info["uuid"] == self.unique_id: |
811 |
self._SetFromMinor(minor)
|
812 |
logger.Info("MD array %s already started" % str(self)) |
813 |
return True |
814 |
free_minor = self._FindUnusedMinor()
|
815 |
result = utils.RunCmd(["mdadm", "-A", "--auto=yes", "--uuid", |
816 |
self.unique_id, "/dev/md%d" % free_minor] + |
817 |
[bdev.dev_path for bdev in self._children]) |
818 |
if result.failed:
|
819 |
logger.Error("Can't assemble MD array: %s: %s" %
|
820 |
(result.fail_reason, result.output)) |
821 |
self.minor = None |
822 |
else:
|
823 |
self.minor = free_minor
|
824 |
return not result.failed |
825 |
|
826 |
def Shutdown(self): |
827 |
"""Tear down the MD array.
|
828 |
|
829 |
This does a 'mdadm --stop' so after this command, the array is no
|
830 |
longer available.
|
831 |
|
832 |
"""
|
833 |
if self.minor is None and not self.Attach(): |
834 |
logger.Info("MD object not attached to a device")
|
835 |
return True |
836 |
|
837 |
result = utils.RunCmd(["mdadm", "--stop", "/dev/md%d" % self.minor]) |
838 |
if result.failed:
|
839 |
logger.Error("Can't stop MD array: %s" % result.fail_reason)
|
840 |
return False |
841 |
self.minor = None |
842 |
self.dev_path = None |
843 |
return True |
844 |
|
845 |
def SetSyncSpeed(self, kbytes): |
846 |
"""Set the maximum sync speed for the MD array.
|
847 |
|
848 |
"""
|
849 |
result = super(MDRaid1, self).SetSyncSpeed(kbytes) |
850 |
if self.minor is None: |
851 |
logger.Error("MD array not attached to a device")
|
852 |
return False |
853 |
f = open("/sys/block/md%d/md/sync_speed_max" % self.minor, "w") |
854 |
try:
|
855 |
f.write("%d" % kbytes)
|
856 |
finally:
|
857 |
f.close() |
858 |
f = open("/sys/block/md%d/md/sync_speed_min" % self.minor, "w") |
859 |
try:
|
860 |
f.write("%d" % (kbytes/2)) |
861 |
finally:
|
862 |
f.close() |
863 |
return result
|
864 |
|
865 |
def GetSyncStatus(self): |
866 |
"""Returns the sync status of the device.
|
867 |
|
868 |
Returns:
|
869 |
(sync_percent, estimated_time)
|
870 |
|
871 |
If sync_percent is None, it means all is ok
|
872 |
If estimated_time is None, it means we can't esimate
|
873 |
the time needed, otherwise it's the time left in seconds
|
874 |
|
875 |
"""
|
876 |
if self.minor is None and not self.Attach(): |
877 |
raise errors.BlockDeviceError("Can't attach to device in GetSyncStatus") |
878 |
dev_info = self._GetDevInfo(self.minor) |
879 |
is_clean = ("state" in dev_info and |
880 |
len(dev_info["state"]) == 1 and |
881 |
dev_info["state"][0] in ("clean", "active")) |
882 |
sys_path = "/sys/block/md%s/md/" % self.minor |
883 |
f = file(sys_path + "sync_action") |
884 |
sync_status = f.readline().strip() |
885 |
f.close() |
886 |
if sync_status == "idle": |
887 |
return None, None, not is_clean |
888 |
f = file(sys_path + "sync_completed") |
889 |
sync_completed = f.readline().strip().split(" / ")
|
890 |
f.close() |
891 |
if len(sync_completed) != 2: |
892 |
return 0, None, not is_clean |
893 |
sync_done, sync_total = [float(i) for i in sync_completed] |
894 |
sync_percent = 100.0*sync_done/sync_total
|
895 |
f = file(sys_path + "sync_speed") |
896 |
sync_speed_k = int(f.readline().strip())
|
897 |
if sync_speed_k == 0: |
898 |
time_est = None
|
899 |
else:
|
900 |
time_est = (sync_total - sync_done) / 2 / sync_speed_k
|
901 |
return sync_percent, time_est, not is_clean |
902 |
|
903 |
def Open(self, force=False): |
904 |
"""Make the device ready for I/O.
|
905 |
|
906 |
This is a no-op for the MDRaid1 device type, although we could use
|
907 |
the 2.6.18's new array_state thing.
|
908 |
|
909 |
"""
|
910 |
return True |
911 |
|
912 |
def Close(self): |
913 |
"""Notifies that the device will no longer be used for I/O.
|
914 |
|
915 |
This is a no-op for the MDRaid1 device type, but see comment for
|
916 |
`Open()`.
|
917 |
|
918 |
"""
|
919 |
return True |
920 |
|
921 |
|
922 |
class BaseDRBD(BlockDev): |
923 |
"""Base DRBD class.
|
924 |
|
925 |
This class contains a few bits of common functionality between the
|
926 |
0.7 and 8.x versions of DRBD.
|
927 |
|
928 |
"""
|
929 |
_VERSION_RE = re.compile(r"^version: (\d+)\.(\d+)\.(\d+)"
|
930 |
r" \(api:(\d+)/proto:(\d+)\)")
|
931 |
_DRBD_MAJOR = 147
|
932 |
_ST_UNCONFIGURED = "Unconfigured"
|
933 |
_ST_WFCONNECTION = "WFConnection"
|
934 |
_ST_CONNECTED = "Connected"
|
935 |
|
936 |
@staticmethod
|
937 |
def _GetProcData(): |
938 |
"""Return data from /proc/drbd.
|
939 |
|
940 |
"""
|
941 |
stat = open("/proc/drbd", "r") |
942 |
try:
|
943 |
data = stat.read().splitlines() |
944 |
finally:
|
945 |
stat.close() |
946 |
if not data: |
947 |
raise errors.BlockDeviceError("Can't read any data from /proc/drbd") |
948 |
return data
|
949 |
|
950 |
@staticmethod
|
951 |
def _MassageProcData(data): |
952 |
"""Transform the output of _GetProdData into a nicer form.
|
953 |
|
954 |
Returns:
|
955 |
a dictionary of minor: joined lines from /proc/drbd for that minor
|
956 |
|
957 |
"""
|
958 |
lmatch = re.compile("^ *([0-9]+):.*$")
|
959 |
results = {} |
960 |
old_minor = old_line = None
|
961 |
for line in data: |
962 |
lresult = lmatch.match(line) |
963 |
if lresult is not None: |
964 |
if old_minor is not None: |
965 |
results[old_minor] = old_line |
966 |
old_minor = int(lresult.group(1)) |
967 |
old_line = line |
968 |
else:
|
969 |
if old_minor is not None: |
970 |
old_line += " " + line.strip()
|
971 |
# add last line
|
972 |
if old_minor is not None: |
973 |
results[old_minor] = old_line |
974 |
return results
|
975 |
|
976 |
@classmethod
|
977 |
def _GetVersion(cls): |
978 |
"""Return the DRBD version.
|
979 |
|
980 |
This will return a list [k_major, k_minor, k_point, api, proto].
|
981 |
|
982 |
"""
|
983 |
proc_data = cls._GetProcData() |
984 |
first_line = proc_data[0].strip()
|
985 |
version = cls._VERSION_RE.match(first_line) |
986 |
if not version: |
987 |
raise errors.BlockDeviceError("Can't parse DRBD version from '%s'" % |
988 |
first_line) |
989 |
return [int(val) for val in version.groups()] |
990 |
|
991 |
@staticmethod
|
992 |
def _DevPath(minor): |
993 |
"""Return the path to a drbd device for a given minor.
|
994 |
|
995 |
"""
|
996 |
return "/dev/drbd%d" % minor |
997 |
|
998 |
@classmethod
|
999 |
def _GetUsedDevs(cls): |
1000 |
"""Compute the list of used DRBD devices.
|
1001 |
|
1002 |
"""
|
1003 |
data = cls._GetProcData() |
1004 |
|
1005 |
used_devs = {} |
1006 |
valid_line = re.compile("^ *([0-9]+): cs:([^ ]+).*$")
|
1007 |
for line in data: |
1008 |
match = valid_line.match(line) |
1009 |
if not match: |
1010 |
continue
|
1011 |
minor = int(match.group(1)) |
1012 |
state = match.group(2)
|
1013 |
if state == cls._ST_UNCONFIGURED:
|
1014 |
continue
|
1015 |
used_devs[minor] = state, line |
1016 |
|
1017 |
return used_devs
|
1018 |
|
1019 |
def _SetFromMinor(self, minor): |
1020 |
"""Set our parameters based on the given minor.
|
1021 |
|
1022 |
This sets our minor variable and our dev_path.
|
1023 |
|
1024 |
"""
|
1025 |
if minor is None: |
1026 |
self.minor = self.dev_path = None |
1027 |
else:
|
1028 |
self.minor = minor
|
1029 |
self.dev_path = self._DevPath(minor) |
1030 |
|
1031 |
@staticmethod
|
1032 |
def _CheckMetaSize(meta_device): |
1033 |
"""Check if the given meta device looks like a valid one.
|
1034 |
|
1035 |
This currently only check the size, which must be around
|
1036 |
128MiB.
|
1037 |
|
1038 |
"""
|
1039 |
result = utils.RunCmd(["blockdev", "--getsize", meta_device]) |
1040 |
if result.failed:
|
1041 |
logger.Error("Failed to get device size: %s" % result.fail_reason)
|
1042 |
return False |
1043 |
try:
|
1044 |
sectors = int(result.stdout)
|
1045 |
except ValueError: |
1046 |
logger.Error("Invalid output from blockdev: '%s'" % result.stdout)
|
1047 |
return False |
1048 |
bytes = sectors * 512
|
1049 |
if bytes < 128 * 1024 * 1024: # less than 128MiB |
1050 |
logger.Error("Meta device too small (%.2fMib)" % (bytes / 1024 / 1024)) |
1051 |
return False |
1052 |
if bytes > (128 + 32) * 1024 * 1024: # account for an extra (big) PE on LVM |
1053 |
logger.Error("Meta device too big (%.2fMiB)" % (bytes / 1024 / 1024)) |
1054 |
return False |
1055 |
return True |
1056 |
|
1057 |
def Rename(self, new_id): |
1058 |
"""Rename a device.
|
1059 |
|
1060 |
This is not supported for drbd devices.
|
1061 |
|
1062 |
"""
|
1063 |
raise errors.ProgrammerError("Can't rename a drbd device") |
1064 |
|
1065 |
|
1066 |
class DRBDev(BaseDRBD): |
1067 |
"""DRBD block device.
|
1068 |
|
1069 |
This implements the local host part of the DRBD device, i.e. it
|
1070 |
doesn't do anything to the supposed peer. If you need a fully
|
1071 |
connected DRBD pair, you need to use this class on both hosts.
|
1072 |
|
1073 |
The unique_id for the drbd device is the (local_ip, local_port,
|
1074 |
remote_ip, remote_port) tuple, and it must have two children: the
|
1075 |
data device and the meta_device. The meta device is checked for
|
1076 |
valid size and is zeroed on create.
|
1077 |
|
1078 |
"""
|
1079 |
def __init__(self, unique_id, children): |
1080 |
super(DRBDev, self).__init__(unique_id, children) |
1081 |
self.major = self._DRBD_MAJOR |
1082 |
[kmaj, kmin, kfix, api, proto] = self._GetVersion()
|
1083 |
if kmaj != 0 and kmin != 7: |
1084 |
raise errors.BlockDeviceError("Mismatch in DRBD kernel version and" |
1085 |
" requested ganeti usage: kernel is"
|
1086 |
" %s.%s, ganeti wants 0.7" % (kmaj, kmin))
|
1087 |
|
1088 |
if len(children) != 2: |
1089 |
raise ValueError("Invalid configuration data %s" % str(children)) |
1090 |
if not isinstance(unique_id, (tuple, list)) or len(unique_id) != 4: |
1091 |
raise ValueError("Invalid configuration data %s" % str(unique_id)) |
1092 |
self._lhost, self._lport, self._rhost, self._rport = unique_id |
1093 |
self.Attach()
|
1094 |
|
1095 |
@classmethod
|
1096 |
def _FindUnusedMinor(cls): |
1097 |
"""Find an unused DRBD device.
|
1098 |
|
1099 |
"""
|
1100 |
data = cls._GetProcData() |
1101 |
|
1102 |
valid_line = re.compile("^ *([0-9]+): cs:Unconfigured$")
|
1103 |
for line in data: |
1104 |
match = valid_line.match(line) |
1105 |
if match:
|
1106 |
return int(match.group(1)) |
1107 |
logger.Error("Error: no free drbd minors!")
|
1108 |
raise errors.BlockDeviceError("Can't find a free DRBD minor") |
1109 |
|
1110 |
@classmethod
|
1111 |
def _GetDevInfo(cls, minor): |
1112 |
"""Get details about a given DRBD minor.
|
1113 |
|
1114 |
This return, if available, the local backing device in (major,
|
1115 |
minor) formant and the local and remote (ip, port) information.
|
1116 |
|
1117 |
"""
|
1118 |
data = {} |
1119 |
result = utils.RunCmd(["drbdsetup", cls._DevPath(minor), "show"]) |
1120 |
if result.failed:
|
1121 |
logger.Error("Can't display the drbd config: %s" % result.fail_reason)
|
1122 |
return data
|
1123 |
out = result.stdout |
1124 |
if out == "Not configured\n": |
1125 |
return data
|
1126 |
for line in out.splitlines(): |
1127 |
if "local_dev" not in data: |
1128 |
match = re.match("^Lower device: ([0-9]+):([0-9]+) .*$", line)
|
1129 |
if match:
|
1130 |
data["local_dev"] = (int(match.group(1)), int(match.group(2))) |
1131 |
continue
|
1132 |
if "meta_dev" not in data: |
1133 |
match = re.match("^Meta device: (([0-9]+):([0-9]+)|internal).*$", line)
|
1134 |
if match:
|
1135 |
if match.group(2) is not None and match.group(3) is not None: |
1136 |
# matched on the major/minor
|
1137 |
data["meta_dev"] = (int(match.group(2)), int(match.group(3))) |
1138 |
else:
|
1139 |
# matched on the "internal" string
|
1140 |
data["meta_dev"] = match.group(1) |
1141 |
# in this case, no meta_index is in the output
|
1142 |
data["meta_index"] = -1 |
1143 |
continue
|
1144 |
if "meta_index" not in data: |
1145 |
match = re.match("^Meta index: ([0-9]+).*$", line)
|
1146 |
if match:
|
1147 |
data["meta_index"] = int(match.group(1)) |
1148 |
continue
|
1149 |
if "local_addr" not in data: |
1150 |
match = re.match("^Local address: ([0-9.]+):([0-9]+)$", line)
|
1151 |
if match:
|
1152 |
data["local_addr"] = (match.group(1), int(match.group(2))) |
1153 |
continue
|
1154 |
if "remote_addr" not in data: |
1155 |
match = re.match("^Remote address: ([0-9.]+):([0-9]+)$", line)
|
1156 |
if match:
|
1157 |
data["remote_addr"] = (match.group(1), int(match.group(2))) |
1158 |
continue
|
1159 |
return data
|
1160 |
|
1161 |
def _MatchesLocal(self, info): |
1162 |
"""Test if our local config matches with an existing device.
|
1163 |
|
1164 |
The parameter should be as returned from `_GetDevInfo()`. This
|
1165 |
method tests if our local backing device is the same as the one in
|
1166 |
the info parameter, in effect testing if we look like the given
|
1167 |
device.
|
1168 |
|
1169 |
"""
|
1170 |
if not ("local_dev" in info and "meta_dev" in info and |
1171 |
"meta_index" in info): |
1172 |
return False |
1173 |
|
1174 |
backend = self._children[0] |
1175 |
if backend is not None: |
1176 |
retval = (info["local_dev"] == (backend.major, backend.minor))
|
1177 |
else:
|
1178 |
retval = (info["local_dev"] == (0, 0)) |
1179 |
meta = self._children[1] |
1180 |
if meta is not None: |
1181 |
retval = retval and (info["meta_dev"] == (meta.major, meta.minor)) |
1182 |
retval = retval and (info["meta_index"] == 0) |
1183 |
else:
|
1184 |
retval = retval and (info["meta_dev"] == "internal" and |
1185 |
info["meta_index"] == -1) |
1186 |
return retval
|
1187 |
|
1188 |
def _MatchesNet(self, info): |
1189 |
"""Test if our network config matches with an existing device.
|
1190 |
|
1191 |
The parameter should be as returned from `_GetDevInfo()`. This
|
1192 |
method tests if our network configuration is the same as the one
|
1193 |
in the info parameter, in effect testing if we look like the given
|
1194 |
device.
|
1195 |
|
1196 |
"""
|
1197 |
if (((self._lhost is None and not ("local_addr" in info)) and |
1198 |
(self._rhost is None and not ("remote_addr" in info)))): |
1199 |
return True |
1200 |
|
1201 |
if self._lhost is None: |
1202 |
return False |
1203 |
|
1204 |
if not ("local_addr" in info and |
1205 |
"remote_addr" in info): |
1206 |
return False |
1207 |
|
1208 |
retval = (info["local_addr"] == (self._lhost, self._lport)) |
1209 |
retval = (retval and
|
1210 |
info["remote_addr"] == (self._rhost, self._rport)) |
1211 |
return retval
|
1212 |
|
1213 |
@classmethod
|
1214 |
def _AssembleLocal(cls, minor, backend, meta): |
1215 |
"""Configure the local part of a DRBD device.
|
1216 |
|
1217 |
This is the first thing that must be done on an unconfigured DRBD
|
1218 |
device. And it must be done only once.
|
1219 |
|
1220 |
"""
|
1221 |
if not cls._CheckMetaSize(meta): |
1222 |
return False |
1223 |
result = utils.RunCmd(["drbdsetup", cls._DevPath(minor), "disk", |
1224 |
backend, meta, "0", "-e", "detach"]) |
1225 |
if result.failed:
|
1226 |
logger.Error("Can't attach local disk: %s" % result.output)
|
1227 |
return not result.failed |
1228 |
|
1229 |
@classmethod
|
1230 |
def _ShutdownLocal(cls, minor): |
1231 |
"""Detach from the local device.
|
1232 |
|
1233 |
I/Os will continue to be served from the remote device. If we
|
1234 |
don't have a remote device, this operation will fail.
|
1235 |
|
1236 |
"""
|
1237 |
result = utils.RunCmd(["drbdsetup", cls._DevPath(minor), "detach"]) |
1238 |
if result.failed:
|
1239 |
logger.Error("Can't detach local device: %s" % result.output)
|
1240 |
return not result.failed |
1241 |
|
1242 |
@staticmethod
|
1243 |
def _ShutdownAll(minor): |
1244 |
"""Deactivate the device.
|
1245 |
|
1246 |
This will, of course, fail if the device is in use.
|
1247 |
|
1248 |
"""
|
1249 |
result = utils.RunCmd(["drbdsetup", DRBDev._DevPath(minor), "down"]) |
1250 |
if result.failed:
|
1251 |
logger.Error("Can't shutdown drbd device: %s" % result.output)
|
1252 |
return not result.failed |
1253 |
|
1254 |
@classmethod
|
1255 |
def _AssembleNet(cls, minor, net_info, protocol): |
1256 |
"""Configure the network part of the device.
|
1257 |
|
1258 |
This operation can be, in theory, done multiple times, but there
|
1259 |
have been cases (in lab testing) in which the network part of the
|
1260 |
device had become stuck and couldn't be shut down because activity
|
1261 |
from the new peer (also stuck) triggered a timer re-init and
|
1262 |
needed remote peer interface shutdown in order to clear. So please
|
1263 |
don't change online the net config.
|
1264 |
|
1265 |
"""
|
1266 |
lhost, lport, rhost, rport = net_info |
1267 |
result = utils.RunCmd(["drbdsetup", cls._DevPath(minor), "net", |
1268 |
"%s:%s" % (lhost, lport), "%s:%s" % (rhost, rport), |
1269 |
protocol]) |
1270 |
if result.failed:
|
1271 |
logger.Error("Can't setup network for dbrd device: %s" %
|
1272 |
result.fail_reason) |
1273 |
return False |
1274 |
|
1275 |
timeout = time.time() + 10
|
1276 |
ok = False
|
1277 |
while time.time() < timeout:
|
1278 |
info = cls._GetDevInfo(minor) |
1279 |
if not "local_addr" in info or not "remote_addr" in info: |
1280 |
time.sleep(1)
|
1281 |
continue
|
1282 |
if (info["local_addr"] != (lhost, lport) or |
1283 |
info["remote_addr"] != (rhost, rport)):
|
1284 |
time.sleep(1)
|
1285 |
continue
|
1286 |
ok = True
|
1287 |
break
|
1288 |
if not ok: |
1289 |
logger.Error("Timeout while configuring network")
|
1290 |
return False |
1291 |
return True |
1292 |
|
1293 |
@classmethod
|
1294 |
def _ShutdownNet(cls, minor): |
1295 |
"""Disconnect from the remote peer.
|
1296 |
|
1297 |
This fails if we don't have a local device.
|
1298 |
|
1299 |
"""
|
1300 |
result = utils.RunCmd(["drbdsetup", cls._DevPath(minor), "disconnect"]) |
1301 |
logger.Error("Can't shutdown network: %s" % result.output)
|
1302 |
return not result.failed |
1303 |
|
1304 |
def Assemble(self): |
1305 |
"""Assemble the drbd.
|
1306 |
|
1307 |
Method:
|
1308 |
- if we have a local backing device, we bind to it by:
|
1309 |
- checking the list of used drbd devices
|
1310 |
- check if the local minor use of any of them is our own device
|
1311 |
- if yes, abort?
|
1312 |
- if not, bind
|
1313 |
- if we have a local/remote net info:
|
1314 |
- redo the local backing device step for the remote device
|
1315 |
- check if any drbd device is using the local port,
|
1316 |
if yes abort
|
1317 |
- check if any remote drbd device is using the remote
|
1318 |
port, if yes abort (for now)
|
1319 |
- bind our net port
|
1320 |
- bind the remote net port
|
1321 |
|
1322 |
"""
|
1323 |
self.Attach()
|
1324 |
if self.minor is not None: |
1325 |
logger.Info("Already assembled")
|
1326 |
return True |
1327 |
|
1328 |
result = super(DRBDev, self).Assemble() |
1329 |
if not result: |
1330 |
return result
|
1331 |
|
1332 |
minor = self._FindUnusedMinor()
|
1333 |
need_localdev_teardown = False
|
1334 |
if self._children[0]: |
1335 |
result = self._AssembleLocal(minor, self._children[0].dev_path, |
1336 |
self._children[1].dev_path) |
1337 |
if not result: |
1338 |
return False |
1339 |
need_localdev_teardown = True
|
1340 |
if self._lhost and self._lport and self._rhost and self._rport: |
1341 |
result = self._AssembleNet(minor,
|
1342 |
(self._lhost, self._lport, |
1343 |
self._rhost, self._rport), |
1344 |
"C")
|
1345 |
if not result: |
1346 |
if need_localdev_teardown:
|
1347 |
# we will ignore failures from this
|
1348 |
logger.Error("net setup failed, tearing down local device")
|
1349 |
self._ShutdownAll(minor)
|
1350 |
return False |
1351 |
self._SetFromMinor(minor)
|
1352 |
return True |
1353 |
|
1354 |
def Shutdown(self): |
1355 |
"""Shutdown the DRBD device.
|
1356 |
|
1357 |
"""
|
1358 |
if self.minor is None and not self.Attach(): |
1359 |
logger.Info("DRBD device not attached to a device during Shutdown")
|
1360 |
return True |
1361 |
if not self._ShutdownAll(self.minor): |
1362 |
return False |
1363 |
self.minor = None |
1364 |
self.dev_path = None |
1365 |
return True |
1366 |
|
1367 |
def Attach(self): |
1368 |
"""Find a DRBD device which matches our config and attach to it.
|
1369 |
|
1370 |
In case of partially attached (local device matches but no network
|
1371 |
setup), we perform the network attach. If successful, we re-test
|
1372 |
the attach if can return success.
|
1373 |
|
1374 |
"""
|
1375 |
for minor in self._GetUsedDevs(): |
1376 |
info = self._GetDevInfo(minor)
|
1377 |
match_l = self._MatchesLocal(info)
|
1378 |
match_r = self._MatchesNet(info)
|
1379 |
if match_l and match_r: |
1380 |
break
|
1381 |
if match_l and not match_r and "local_addr" not in info: |
1382 |
res_r = self._AssembleNet(minor,
|
1383 |
(self._lhost, self._lport, |
1384 |
self._rhost, self._rport), |
1385 |
"C")
|
1386 |
if res_r and self._MatchesNet(self._GetDevInfo(minor)): |
1387 |
break
|
1388 |
else:
|
1389 |
minor = None
|
1390 |
|
1391 |
self._SetFromMinor(minor)
|
1392 |
return minor is not None |
1393 |
|
1394 |
def Open(self, force=False): |
1395 |
"""Make the local state primary.
|
1396 |
|
1397 |
If the 'force' parameter is given, the '--do-what-I-say' parameter
|
1398 |
is given. Since this is a pottentialy dangerous operation, the
|
1399 |
force flag should be only given after creation, when it actually
|
1400 |
has to be given.
|
1401 |
|
1402 |
"""
|
1403 |
if self.minor is None and not self.Attach(): |
1404 |
logger.Error("DRBD cannot attach to a device during open")
|
1405 |
return False |
1406 |
cmd = ["drbdsetup", self.dev_path, "primary"] |
1407 |
if force:
|
1408 |
cmd.append("--do-what-I-say")
|
1409 |
result = utils.RunCmd(cmd) |
1410 |
if result.failed:
|
1411 |
logger.Error("Can't make drbd device primary: %s" % result.output)
|
1412 |
return False |
1413 |
return True |
1414 |
|
1415 |
def Close(self): |
1416 |
"""Make the local state secondary.
|
1417 |
|
1418 |
This will, of course, fail if the device is in use.
|
1419 |
|
1420 |
"""
|
1421 |
if self.minor is None and not self.Attach(): |
1422 |
logger.Info("Instance not attached to a device")
|
1423 |
raise errors.BlockDeviceError("Can't find device") |
1424 |
result = utils.RunCmd(["drbdsetup", self.dev_path, "secondary"]) |
1425 |
if result.failed:
|
1426 |
logger.Error("Can't switch drbd device to secondary: %s" % result.output)
|
1427 |
raise errors.BlockDeviceError("Can't switch drbd device to secondary") |
1428 |
|
1429 |
def SetSyncSpeed(self, kbytes): |
1430 |
"""Set the speed of the DRBD syncer.
|
1431 |
|
1432 |
"""
|
1433 |
children_result = super(DRBDev, self).SetSyncSpeed(kbytes) |
1434 |
if self.minor is None: |
1435 |
logger.Info("Instance not attached to a device")
|
1436 |
return False |
1437 |
result = utils.RunCmd(["drbdsetup", self.dev_path, "syncer", "-r", "%d" % |
1438 |
kbytes]) |
1439 |
if result.failed:
|
1440 |
logger.Error("Can't change syncer rate: %s " % result.fail_reason)
|
1441 |
return not result.failed and children_result |
1442 |
|
1443 |
def GetSyncStatus(self): |
1444 |
"""Returns the sync status of the device.
|
1445 |
|
1446 |
Returns:
|
1447 |
(sync_percent, estimated_time)
|
1448 |
|
1449 |
If sync_percent is None, it means all is ok
|
1450 |
If estimated_time is None, it means we can't esimate
|
1451 |
the time needed, otherwise it's the time left in seconds
|
1452 |
|
1453 |
"""
|
1454 |
if self.minor is None and not self.Attach(): |
1455 |
raise errors.BlockDeviceError("Can't attach to device in GetSyncStatus") |
1456 |
proc_info = self._MassageProcData(self._GetProcData()) |
1457 |
if self.minor not in proc_info: |
1458 |
raise errors.BlockDeviceError("Can't find myself in /proc (minor %d)" % |
1459 |
self.minor)
|
1460 |
line = proc_info[self.minor]
|
1461 |
match = re.match("^.*sync'ed: *([0-9.]+)%.*"
|
1462 |
" finish: ([0-9]+):([0-9]+):([0-9]+) .*$", line)
|
1463 |
if match:
|
1464 |
sync_percent = float(match.group(1)) |
1465 |
hours = int(match.group(2)) |
1466 |
minutes = int(match.group(3)) |
1467 |
seconds = int(match.group(4)) |
1468 |
est_time = hours * 3600 + minutes * 60 + seconds |
1469 |
else:
|
1470 |
sync_percent = None
|
1471 |
est_time = None
|
1472 |
match = re.match("^ *[0-9]+: cs:([^ ]+).*$", line)
|
1473 |
if not match: |
1474 |
raise errors.BlockDeviceError("Can't find my data in /proc (minor %d)" % |
1475 |
self.minor)
|
1476 |
client_state = match.group(1)
|
1477 |
is_degraded = client_state != "Connected"
|
1478 |
return sync_percent, est_time, is_degraded
|
1479 |
|
1480 |
def GetStatus(self): |
1481 |
"""Compute the status of the DRBD device
|
1482 |
|
1483 |
Note that DRBD devices don't have the STATUS_EXISTING state.
|
1484 |
|
1485 |
"""
|
1486 |
if self.minor is None and not self.Attach(): |
1487 |
return self.STATUS_UNKNOWN |
1488 |
|
1489 |
data = self._GetProcData()
|
1490 |
match = re.compile("^ *%d: cs:[^ ]+ st:(Primary|Secondary)/.*$" %
|
1491 |
self.minor)
|
1492 |
for line in data: |
1493 |
mresult = match.match(line) |
1494 |
if mresult:
|
1495 |
break
|
1496 |
else:
|
1497 |
logger.Error("Can't find myself!")
|
1498 |
return self.STATUS_UNKNOWN |
1499 |
|
1500 |
state = mresult.group(2)
|
1501 |
if state == "Primary": |
1502 |
result = self.STATUS_ONLINE
|
1503 |
else:
|
1504 |
result = self.STATUS_STANDBY
|
1505 |
|
1506 |
return result
|
1507 |
|
1508 |
@staticmethod
|
1509 |
def _ZeroDevice(device): |
1510 |
"""Zero a device.
|
1511 |
|
1512 |
This writes until we get ENOSPC.
|
1513 |
|
1514 |
"""
|
1515 |
f = open(device, "w") |
1516 |
buf = "\0" * 1048576 |
1517 |
try:
|
1518 |
while True: |
1519 |
f.write(buf) |
1520 |
except IOError, err: |
1521 |
if err.errno != errno.ENOSPC:
|
1522 |
raise
|
1523 |
|
1524 |
@classmethod
|
1525 |
def Create(cls, unique_id, children, size): |
1526 |
"""Create a new DRBD device.
|
1527 |
|
1528 |
Since DRBD devices are not created per se, just assembled, this
|
1529 |
function just zeroes the meta device.
|
1530 |
|
1531 |
"""
|
1532 |
if len(children) != 2: |
1533 |
raise errors.ProgrammerError("Invalid setup for the drbd device") |
1534 |
meta = children[1]
|
1535 |
meta.Assemble() |
1536 |
if not meta.Attach(): |
1537 |
raise errors.BlockDeviceError("Can't attach to meta device") |
1538 |
if not cls._CheckMetaSize(meta.dev_path): |
1539 |
raise errors.BlockDeviceError("Invalid meta device") |
1540 |
logger.Info("Started zeroing device %s" % meta.dev_path)
|
1541 |
cls._ZeroDevice(meta.dev_path) |
1542 |
logger.Info("Done zeroing device %s" % meta.dev_path)
|
1543 |
return cls(unique_id, children)
|
1544 |
|
1545 |
def Remove(self): |
1546 |
"""Stub remove for DRBD devices.
|
1547 |
|
1548 |
"""
|
1549 |
return self.Shutdown() |
1550 |
|
1551 |
|
1552 |
class DRBD8(BaseDRBD): |
1553 |
"""DRBD v8.x block device.
|
1554 |
|
1555 |
This implements the local host part of the DRBD device, i.e. it
|
1556 |
doesn't do anything to the supposed peer. If you need a fully
|
1557 |
connected DRBD pair, you need to use this class on both hosts.
|
1558 |
|
1559 |
The unique_id for the drbd device is the (local_ip, local_port,
|
1560 |
remote_ip, remote_port) tuple, and it must have two children: the
|
1561 |
data device and the meta_device. The meta device is checked for
|
1562 |
valid size and is zeroed on create.
|
1563 |
|
1564 |
"""
|
1565 |
_MAX_MINORS = 255
|
1566 |
_PARSE_SHOW = None
|
1567 |
|
1568 |
def __init__(self, unique_id, children): |
1569 |
super(DRBD8, self).__init__(unique_id, children) |
1570 |
self.major = self._DRBD_MAJOR |
1571 |
[kmaj, kmin, kfix, api, proto] = self._GetVersion()
|
1572 |
if kmaj != 8: |
1573 |
raise errors.BlockDeviceError("Mismatch in DRBD kernel version and" |
1574 |
" requested ganeti usage: kernel is"
|
1575 |
" %s.%s, ganeti wants 8.x" % (kmaj, kmin))
|
1576 |
|
1577 |
if len(children) not in (0, 2): |
1578 |
raise ValueError("Invalid configuration data %s" % str(children)) |
1579 |
if not isinstance(unique_id, (tuple, list)) or len(unique_id) != 4: |
1580 |
raise ValueError("Invalid configuration data %s" % str(unique_id)) |
1581 |
self._lhost, self._lport, self._rhost, self._rport = unique_id |
1582 |
self.Attach()
|
1583 |
|
1584 |
@classmethod
|
1585 |
def _InitMeta(cls, minor, dev_path): |
1586 |
"""Initialize a meta device.
|
1587 |
|
1588 |
This will not work if the given minor is in use.
|
1589 |
|
1590 |
"""
|
1591 |
result = utils.RunCmd(["drbdmeta", "--force", cls._DevPath(minor), |
1592 |
"v08", dev_path, "0", "create-md"]) |
1593 |
if result.failed:
|
1594 |
raise errors.BlockDeviceError("Can't initialize meta device: %s" % |
1595 |
result.output) |
1596 |
|
1597 |
@classmethod
|
1598 |
def _FindUnusedMinor(cls): |
1599 |
"""Find an unused DRBD device.
|
1600 |
|
1601 |
This is specific to 8.x as the minors are allocated dynamically,
|
1602 |
so non-existing numbers up to a max minor count are actually free.
|
1603 |
|
1604 |
"""
|
1605 |
data = cls._GetProcData() |
1606 |
|
1607 |
unused_line = re.compile("^ *([0-9]+): cs:Unconfigured$")
|
1608 |
used_line = re.compile("^ *([0-9]+): cs:")
|
1609 |
highest = None
|
1610 |
for line in data: |
1611 |
match = unused_line.match(line) |
1612 |
if match:
|
1613 |
return int(match.group(1)) |
1614 |
match = used_line.match(line) |
1615 |
if match:
|
1616 |
minor = int(match.group(1)) |
1617 |
highest = max(highest, minor)
|
1618 |
if highest is None: # there are no minors in use at all |
1619 |
return 0 |
1620 |
if highest >= cls._MAX_MINORS:
|
1621 |
logger.Error("Error: no free drbd minors!")
|
1622 |
raise errors.BlockDeviceError("Can't find a free DRBD minor") |
1623 |
return highest + 1 |
1624 |
|
1625 |
@classmethod
|
1626 |
def _IsValidMeta(cls, meta_device): |
1627 |
"""Check if the given meta device looks like a valid one.
|
1628 |
|
1629 |
"""
|
1630 |
minor = cls._FindUnusedMinor() |
1631 |
minor_path = cls._DevPath(minor) |
1632 |
result = utils.RunCmd(["drbdmeta", minor_path,
|
1633 |
"v08", meta_device, "0", |
1634 |
"dstate"])
|
1635 |
if result.failed:
|
1636 |
logger.Error("Invalid meta device %s: %s" % (meta_device, result.output))
|
1637 |
return False |
1638 |
return True |
1639 |
|
1640 |
@classmethod
|
1641 |
def _GetShowParser(cls): |
1642 |
"""Return a parser for `drbd show` output.
|
1643 |
|
1644 |
This will either create or return an already-create parser for the
|
1645 |
output of the command `drbd show`.
|
1646 |
|
1647 |
"""
|
1648 |
if cls._PARSE_SHOW is not None: |
1649 |
return cls._PARSE_SHOW
|
1650 |
|
1651 |
# pyparsing setup
|
1652 |
lbrace = pyp.Literal("{").suppress()
|
1653 |
rbrace = pyp.Literal("}").suppress()
|
1654 |
semi = pyp.Literal(";").suppress()
|
1655 |
# this also converts the value to an int
|
1656 |
number = pyp.Word(pyp.nums).setParseAction(lambda s, l, t:(l, [int(t[0])])) |
1657 |
|
1658 |
comment = pyp.Literal ("#") + pyp.Optional(pyp.restOfLine)
|
1659 |
defa = pyp.Literal("_is_default").suppress()
|
1660 |
dbl_quote = pyp.Literal('"').suppress()
|
1661 |
|
1662 |
keyword = pyp.Word(pyp.alphanums + '-')
|
1663 |
|
1664 |
# value types
|
1665 |
value = pyp.Word(pyp.alphanums + '_-/.:')
|
1666 |
quoted = dbl_quote + pyp.CharsNotIn('"') + dbl_quote
|
1667 |
addr_port = (pyp.Word(pyp.nums + '.') + pyp.Literal(':').suppress() + |
1668 |
number) |
1669 |
# meta device, extended syntax
|
1670 |
meta_value = ((value ^ quoted) + pyp.Literal('[').suppress() +
|
1671 |
number + pyp.Word(']').suppress())
|
1672 |
|
1673 |
# a statement
|
1674 |
stmt = (~rbrace + keyword + ~lbrace + |
1675 |
(addr_port ^ value ^ quoted ^ meta_value) + |
1676 |
pyp.Optional(defa) + semi + |
1677 |
pyp.Optional(pyp.restOfLine).suppress()) |
1678 |
|
1679 |
# an entire section
|
1680 |
section_name = pyp.Word(pyp.alphas + '_')
|
1681 |
section = section_name + lbrace + pyp.ZeroOrMore(pyp.Group(stmt)) + rbrace |
1682 |
|
1683 |
bnf = pyp.ZeroOrMore(pyp.Group(section ^ stmt)) |
1684 |
bnf.ignore(comment) |
1685 |
|
1686 |
cls._PARSE_SHOW = bnf |
1687 |
|
1688 |
return bnf
|
1689 |
|
1690 |
@classmethod
|
1691 |
def _GetDevInfo(cls, minor): |
1692 |
"""Get details about a given DRBD minor.
|
1693 |
|
1694 |
This return, if available, the local backing device (as a path)
|
1695 |
and the local and remote (ip, port) information.
|
1696 |
|
1697 |
"""
|
1698 |
data = {} |
1699 |
result = utils.RunCmd(["drbdsetup", cls._DevPath(minor), "show"]) |
1700 |
if result.failed:
|
1701 |
logger.Error("Can't display the drbd config: %s" % result.fail_reason)
|
1702 |
return data
|
1703 |
out = result.stdout |
1704 |
if not out: |
1705 |
return data
|
1706 |
|
1707 |
bnf = cls._GetShowParser() |
1708 |
# run pyparse
|
1709 |
|
1710 |
try:
|
1711 |
results = bnf.parseString(out) |
1712 |
except pyp.ParseException, err:
|
1713 |
raise errors.BlockDeviceError("Can't parse drbdsetup show output: %s" % |
1714 |
str(err))
|
1715 |
|
1716 |
# and massage the results into our desired format
|
1717 |
for section in results: |
1718 |
sname = section[0]
|
1719 |
if sname == "_this_host": |
1720 |
for lst in section[1:]: |
1721 |
if lst[0] == "disk": |
1722 |
data["local_dev"] = lst[1] |
1723 |
elif lst[0] == "meta-disk": |
1724 |
data["meta_dev"] = lst[1] |
1725 |
data["meta_index"] = lst[2] |
1726 |
elif lst[0] == "address": |
1727 |
data["local_addr"] = tuple(lst[1:]) |
1728 |
elif sname == "_remote_host": |
1729 |
for lst in section[1:]: |
1730 |
if lst[0] == "address": |
1731 |
data["remote_addr"] = tuple(lst[1:]) |
1732 |
return data
|
1733 |
|
1734 |
def _MatchesLocal(self, info): |
1735 |
"""Test if our local config matches with an existing device.
|
1736 |
|
1737 |
The parameter should be as returned from `_GetDevInfo()`. This
|
1738 |
method tests if our local backing device is the same as the one in
|
1739 |
the info parameter, in effect testing if we look like the given
|
1740 |
device.
|
1741 |
|
1742 |
"""
|
1743 |
if self._children: |
1744 |
backend, meta = self._children
|
1745 |
else:
|
1746 |
backend = meta = None
|
1747 |
|
1748 |
if backend is not None: |
1749 |
retval = ("local_dev" in info and info["local_dev"] == backend.dev_path) |
1750 |
else:
|
1751 |
retval = ("local_dev" not in info) |
1752 |
|
1753 |
if meta is not None: |
1754 |
retval = retval and ("meta_dev" in info and |
1755 |
info["meta_dev"] == meta.dev_path)
|
1756 |
retval = retval and ("meta_index" in info and |
1757 |
info["meta_index"] == 0) |
1758 |
else:
|
1759 |
retval = retval and ("meta_dev" not in info and |
1760 |
"meta_index" not in info) |
1761 |
return retval
|
1762 |
|
1763 |
def _MatchesNet(self, info): |
1764 |
"""Test if our network config matches with an existing device.
|
1765 |
|
1766 |
The parameter should be as returned from `_GetDevInfo()`. This
|
1767 |
method tests if our network configuration is the same as the one
|
1768 |
in the info parameter, in effect testing if we look like the given
|
1769 |
device.
|
1770 |
|
1771 |
"""
|
1772 |
if (((self._lhost is None and not ("local_addr" in info)) and |
1773 |
(self._rhost is None and not ("remote_addr" in info)))): |
1774 |
return True |
1775 |
|
1776 |
if self._lhost is None: |
1777 |
return False |
1778 |
|
1779 |
if not ("local_addr" in info and |
1780 |
"remote_addr" in info): |
1781 |
return False |
1782 |
|
1783 |
retval = (info["local_addr"] == (self._lhost, self._lport)) |
1784 |
retval = (retval and
|
1785 |
info["remote_addr"] == (self._rhost, self._rport)) |
1786 |
return retval
|
1787 |
|
1788 |
@classmethod
|
1789 |
def _AssembleLocal(cls, minor, backend, meta): |
1790 |
"""Configure the local part of a DRBD device.
|
1791 |
|
1792 |
This is the first thing that must be done on an unconfigured DRBD
|
1793 |
device. And it must be done only once.
|
1794 |
|
1795 |
"""
|
1796 |
if not cls._IsValidMeta(meta): |
1797 |
return False |
1798 |
result = utils.RunCmd(["drbdsetup", cls._DevPath(minor), "disk", |
1799 |
backend, meta, "0", "-e", "detach", |
1800 |
"--create-device"])
|
1801 |
if result.failed:
|
1802 |
logger.Error("Can't attach local disk: %s" % result.output)
|
1803 |
return not result.failed |
1804 |
|
1805 |
@classmethod
|
1806 |
def _AssembleNet(cls, minor, net_info, protocol, |
1807 |
dual_pri=False, hmac=None, secret=None): |
1808 |
"""Configure the network part of the device.
|
1809 |
|
1810 |
"""
|
1811 |
lhost, lport, rhost, rport = net_info |
1812 |
args = ["drbdsetup", cls._DevPath(minor), "net", |
1813 |
"%s:%s" % (lhost, lport), "%s:%s" % (rhost, rport), protocol, |
1814 |
"-A", "discard-zero-changes", |
1815 |
"-B", "consensus", |
1816 |
] |
1817 |
if dual_pri:
|
1818 |
args.append("-m")
|
1819 |
if hmac and secret: |
1820 |
args.extend(["-a", hmac, "-x", secret]) |
1821 |
result = utils.RunCmd(args) |
1822 |
if result.failed:
|
1823 |
logger.Error("Can't setup network for dbrd device: %s" %
|
1824 |
result.fail_reason) |
1825 |
return False |
1826 |
|
1827 |
timeout = time.time() + 10
|
1828 |
ok = False
|
1829 |
while time.time() < timeout:
|
1830 |
info = cls._GetDevInfo(minor) |
1831 |
if not "local_addr" in info or not "remote_addr" in info: |
1832 |
time.sleep(1)
|
1833 |
continue
|
1834 |
if (info["local_addr"] != (lhost, lport) or |
1835 |
info["remote_addr"] != (rhost, rport)):
|
1836 |
time.sleep(1)
|
1837 |
continue
|
1838 |
ok = True
|
1839 |
break
|
1840 |
if not ok: |
1841 |
logger.Error("Timeout while configuring network")
|
1842 |
return False |
1843 |
return True |
1844 |
|
1845 |
def AddChildren(self, devices): |
1846 |
"""Add a disk to the DRBD device.
|
1847 |
|
1848 |
"""
|
1849 |
if self.minor is None: |
1850 |
raise errors.BlockDeviceError("Can't attach to dbrd8 during AddChildren") |
1851 |
|
1852 |
if len(devices) != 2: |
1853 |
raise errors.BlockDeviceError("Need two devices for AddChildren") |
1854 |
if self._children: |
1855 |
raise errors.BlockDeviceError("DRBD8 already attached to a local disk") |
1856 |
backend, meta = devices |
1857 |
if backend.dev_path is None or meta.dev_path is None: |
1858 |
raise errors.BlockDeviceError("Children not ready during AddChildren") |
1859 |
backend.Open() |
1860 |
meta.Open() |
1861 |
if not self._CheckMetaSize(meta.dev_path): |
1862 |
raise errors.BlockDeviceError("Invalid meta device size") |
1863 |
self._InitMeta(self._FindUnusedMinor(), meta.dev_path) |
1864 |
if not self._IsValidMeta(meta.dev_path): |
1865 |
raise errors.BlockDeviceError("Cannot initalize meta device") |
1866 |
|
1867 |
if not self._AssembleLocal(self.minor, backend.dev_path, meta.dev_path): |
1868 |
raise errors.BlockDeviceError("Can't attach to local storage") |
1869 |
self._children = devices
|
1870 |
|
1871 |
def RemoveChildren(self, devices): |
1872 |
"""Detach the drbd device from local storage.
|
1873 |
|
1874 |
"""
|
1875 |
if self.minor is None: |
1876 |
raise errors.BlockDeviceError("Can't attach to drbd8 during" |
1877 |
" RemoveChildren")
|
1878 |
if len(self._children) != 2: |
1879 |
raise errors.BlockDeviceError("We don't have two children: %s" % |
1880 |
self._children)
|
1881 |
if self._children.count(None) == 2: # we don't actually have children :) |
1882 |
logger.Error("Requested detach while detached")
|
1883 |
return
|
1884 |
if len(devices) != 2: |
1885 |
raise errors.BlockDeviceError("We need two children in RemoveChildren") |
1886 |
for child, dev in zip(self._children, devices): |
1887 |
if dev != child.dev_path:
|
1888 |
raise errors.BlockDeviceError("Mismatch in local storage" |
1889 |
" (%s != %s) in RemoveChildren" %
|
1890 |
(dev, child.dev_path)) |
1891 |
|
1892 |
if not self._ShutdownLocal(self.minor): |
1893 |
raise errors.BlockDeviceError("Can't detach from local storage") |
1894 |
self._children = []
|
1895 |
|
1896 |
def SetSyncSpeed(self, kbytes): |
1897 |
"""Set the speed of the DRBD syncer.
|
1898 |
|
1899 |
"""
|
1900 |
children_result = super(DRBD8, self).SetSyncSpeed(kbytes) |
1901 |
if self.minor is None: |
1902 |
logger.Info("Instance not attached to a device")
|
1903 |
return False |
1904 |
result = utils.RunCmd(["drbdsetup", self.dev_path, "syncer", "-r", "%d" % |
1905 |
kbytes]) |
1906 |
if result.failed:
|
1907 |
logger.Error("Can't change syncer rate: %s " % result.fail_reason)
|
1908 |
return not result.failed and children_result |
1909 |
|
1910 |
def GetSyncStatus(self): |
1911 |
"""Returns the sync status of the device.
|
1912 |
|
1913 |
Returns:
|
1914 |
(sync_percent, estimated_time)
|
1915 |
|
1916 |
If sync_percent is None, it means all is ok
|
1917 |
If estimated_time is None, it means we can't esimate
|
1918 |
the time needed, otherwise it's the time left in seconds
|
1919 |
|
1920 |
"""
|
1921 |
if self.minor is None and not self.Attach(): |
1922 |
raise errors.BlockDeviceError("Can't attach to device in GetSyncStatus") |
1923 |
proc_info = self._MassageProcData(self._GetProcData()) |
1924 |
if self.minor not in proc_info: |
1925 |
raise errors.BlockDeviceError("Can't find myself in /proc (minor %d)" % |
1926 |
self.minor)
|
1927 |
line = proc_info[self.minor]
|
1928 |
match = re.match("^.*sync'ed: *([0-9.]+)%.*"
|
1929 |
" finish: ([0-9]+):([0-9]+):([0-9]+) .*$", line)
|
1930 |
if match:
|
1931 |
sync_percent = float(match.group(1)) |
1932 |
hours = int(match.group(2)) |
1933 |
minutes = int(match.group(3)) |
1934 |
seconds = int(match.group(4)) |
1935 |
est_time = hours * 3600 + minutes * 60 + seconds |
1936 |
else:
|
1937 |
sync_percent = None
|
1938 |
est_time = None
|
1939 |
match = re.match("^ *[0-9]+: cs:([^ ]+).*$", line)
|
1940 |
if not match: |
1941 |
raise errors.BlockDeviceError("Can't find my data in /proc (minor %d)" % |
1942 |
self.minor)
|
1943 |
client_state = match.group(1)
|
1944 |
is_degraded = client_state != "Connected"
|
1945 |
return sync_percent, est_time, is_degraded
|
1946 |
|
1947 |
def GetStatus(self): |
1948 |
"""Compute the status of the DRBD device
|
1949 |
|
1950 |
Note that DRBD devices don't have the STATUS_EXISTING state.
|
1951 |
|
1952 |
"""
|
1953 |
if self.minor is None and not self.Attach(): |
1954 |
return self.STATUS_UNKNOWN |
1955 |
|
1956 |
data = self._GetProcData()
|
1957 |
match = re.compile("^ *%d: cs:[^ ]+ st:(Primary|Secondary)/.*$" %
|
1958 |
self.minor)
|
1959 |
for line in data: |
1960 |
mresult = match.match(line) |
1961 |
if mresult:
|
1962 |
break
|
1963 |
else:
|
1964 |
logger.Error("Can't find myself!")
|
1965 |
return self.STATUS_UNKNOWN |
1966 |
|
1967 |
state = mresult.group(2)
|
1968 |
if state == "Primary": |
1969 |
result = self.STATUS_ONLINE
|
1970 |
else:
|
1971 |
result = self.STATUS_STANDBY
|
1972 |
|
1973 |
return result
|
1974 |
|
1975 |
def Open(self, force=False): |
1976 |
"""Make the local state primary.
|
1977 |
|
1978 |
If the 'force' parameter is given, the '--do-what-I-say' parameter
|
1979 |
is given. Since this is a pottentialy dangerous operation, the
|
1980 |
force flag should be only given after creation, when it actually
|
1981 |
has to be given.
|
1982 |
|
1983 |
"""
|
1984 |
if self.minor is None and not self.Attach(): |
1985 |
logger.Error("DRBD cannot attach to a device during open")
|
1986 |
return False |
1987 |
cmd = ["drbdsetup", self.dev_path, "primary"] |
1988 |
if force:
|
1989 |
cmd.append("-o")
|
1990 |
result = utils.RunCmd(cmd) |
1991 |
if result.failed:
|
1992 |
logger.Error("Can't make drbd device primary: %s" % result.output)
|
1993 |
return False |
1994 |
return True |
1995 |
|
1996 |
def Close(self): |
1997 |
"""Make the local state secondary.
|
1998 |
|
1999 |
This will, of course, fail if the device is in use.
|
2000 |
|
2001 |
"""
|
2002 |
if self.minor is None and not self.Attach(): |
2003 |
logger.Info("Instance not attached to a device")
|
2004 |
raise errors.BlockDeviceError("Can't find device") |
2005 |
result = utils.RunCmd(["drbdsetup", self.dev_path, "secondary"]) |
2006 |
if result.failed:
|
2007 |
logger.Error("Can't switch drbd device to secondary: %s" % result.output)
|
2008 |
raise errors.BlockDeviceError("Can't switch drbd device to secondary") |
2009 |
|
2010 |
def Attach(self): |
2011 |
"""Find a DRBD device which matches our config and attach to it.
|
2012 |
|
2013 |
In case of partially attached (local device matches but no network
|
2014 |
setup), we perform the network attach. If successful, we re-test
|
2015 |
the attach if can return success.
|
2016 |
|
2017 |
"""
|
2018 |
for minor in self._GetUsedDevs(): |
2019 |
info = self._GetDevInfo(minor)
|
2020 |
match_l = self._MatchesLocal(info)
|
2021 |
match_r = self._MatchesNet(info)
|
2022 |
if match_l and match_r: |
2023 |
break
|
2024 |
if match_l and not match_r and "local_addr" not in info: |
2025 |
res_r = self._AssembleNet(minor,
|
2026 |
(self._lhost, self._lport, |
2027 |
self._rhost, self._rport), |
2028 |
"C")
|
2029 |
if res_r and self._MatchesNet(self._GetDevInfo(minor)): |
2030 |
break
|
2031 |
else:
|
2032 |
minor = None
|
2033 |
|
2034 |
self._SetFromMinor(minor)
|
2035 |
return minor is not None |
2036 |
|
2037 |
def Assemble(self): |
2038 |
"""Assemble the drbd.
|
2039 |
|
2040 |
Method:
|
2041 |
- if we have a local backing device, we bind to it by:
|
2042 |
- checking the list of used drbd devices
|
2043 |
- check if the local minor use of any of them is our own device
|
2044 |
- if yes, abort?
|
2045 |
- if not, bind
|
2046 |
- if we have a local/remote net info:
|
2047 |
- redo the local backing device step for the remote device
|
2048 |
- check if any drbd device is using the local port,
|
2049 |
if yes abort
|
2050 |
- check if any remote drbd device is using the remote
|
2051 |
port, if yes abort (for now)
|
2052 |
- bind our net port
|
2053 |
- bind the remote net port
|
2054 |
|
2055 |
"""
|
2056 |
self.Attach()
|
2057 |
if self.minor is not None: |
2058 |
logger.Info("Already assembled")
|
2059 |
return True |
2060 |
|
2061 |
result = super(DRBD8, self).Assemble() |
2062 |
if not result: |
2063 |
return result
|
2064 |
|
2065 |
minor = self._FindUnusedMinor()
|
2066 |
need_localdev_teardown = False
|
2067 |
if self._children[0]: |
2068 |
result = self._AssembleLocal(minor, self._children[0].dev_path, |
2069 |
self._children[1].dev_path) |
2070 |
if not result: |
2071 |
return False |
2072 |
need_localdev_teardown = True
|
2073 |
if self._lhost and self._lport and self._rhost and self._rport: |
2074 |
result = self._AssembleNet(minor,
|
2075 |
(self._lhost, self._lport, |
2076 |
self._rhost, self._rport), |
2077 |
"C")
|
2078 |
if not result: |
2079 |
if need_localdev_teardown:
|
2080 |
# we will ignore failures from this
|
2081 |
logger.Error("net setup failed, tearing down local device")
|
2082 |
self._ShutdownAll(minor)
|
2083 |
return False |
2084 |
self._SetFromMinor(minor)
|
2085 |
return True |
2086 |
|
2087 |
@classmethod
|
2088 |
def _ShutdownLocal(cls, minor): |
2089 |
"""Detach from the local device.
|
2090 |
|
2091 |
I/Os will continue to be served from the remote device. If we
|
2092 |
don't have a remote device, this operation will fail.
|
2093 |
|
2094 |
"""
|
2095 |
result = utils.RunCmd(["drbdsetup", cls._DevPath(minor), "detach"]) |
2096 |
if result.failed:
|
2097 |
logger.Error("Can't detach local device: %s" % result.output)
|
2098 |
return not result.failed |
2099 |
|
2100 |
@classmethod
|
2101 |
def _ShutdownNet(cls, minor): |
2102 |
"""Disconnect from the remote peer.
|
2103 |
|
2104 |
This fails if we don't have a local device.
|
2105 |
|
2106 |
"""
|
2107 |
result = utils.RunCmd(["drbdsetup", cls._DevPath(minor), "disconnect"]) |
2108 |
logger.Error("Can't shutdown network: %s" % result.output)
|
2109 |
return not result.failed |
2110 |
|
2111 |
@classmethod
|
2112 |
def _ShutdownAll(cls, minor): |
2113 |
"""Deactivate the device.
|
2114 |
|
2115 |
This will, of course, fail if the device is in use.
|
2116 |
|
2117 |
"""
|
2118 |
result = utils.RunCmd(["drbdsetup", cls._DevPath(minor), "down"]) |
2119 |
if result.failed:
|
2120 |
logger.Error("Can't shutdown drbd device: %s" % result.output)
|
2121 |
return not result.failed |
2122 |
|
2123 |
def Shutdown(self): |
2124 |
"""Shutdown the DRBD device.
|
2125 |
|
2126 |
"""
|
2127 |
if self.minor is None and not self.Attach(): |
2128 |
logger.Info("DRBD device not attached to a device during Shutdown")
|
2129 |
return True |
2130 |
if not self._ShutdownAll(self.minor): |
2131 |
return False |
2132 |
self.minor = None |
2133 |
self.dev_path = None |
2134 |
return True |
2135 |
|
2136 |
def Rename(self, new_uid): |
2137 |
"""Re-connect this device to another peer.
|
2138 |
|
2139 |
"""
|
2140 |
if self.minor is None: |
2141 |
raise errors.BlockDeviceError("Device not attached during rename") |
2142 |
if self._rhost is not None: |
2143 |
# this means we did have a host when we attached, so we are connected
|
2144 |
if not self._ShutdownNet(self.minor): |
2145 |
raise errors.BlockDeviceError("Can't disconnect from remote peer") |
2146 |
old_id = self.unique_id
|
2147 |
else:
|
2148 |
old_id = None
|
2149 |
self.unique_id = new_uid
|
2150 |
if not self._AssembleNet(self.minor, self.unique_id, "C"): |
2151 |
logger.Error("Can't attach to new peer!")
|
2152 |
if old_id is not None: |
2153 |
self._AssembleNet(self.minor, old_id, "C") |
2154 |
self.unique_id = old_id
|
2155 |
raise errors.BlockDeviceError("Can't attach to new peer") |
2156 |
|
2157 |
def Remove(self): |
2158 |
"""Stub remove for DRBD devices.
|
2159 |
|
2160 |
"""
|
2161 |
return self.Shutdown() |
2162 |
|
2163 |
@classmethod
|
2164 |
def Create(cls, unique_id, children, size): |
2165 |
"""Create a new DRBD8 device.
|
2166 |
|
2167 |
Since DRBD devices are not created per se, just assembled, this
|
2168 |
function only initializes the metadata.
|
2169 |
|
2170 |
"""
|
2171 |
if len(children) != 2: |
2172 |
raise errors.ProgrammerError("Invalid setup for the drbd device") |
2173 |
meta = children[1]
|
2174 |
meta.Assemble() |
2175 |
if not meta.Attach(): |
2176 |
raise errors.BlockDeviceError("Can't attach to meta device") |
2177 |
if not cls._CheckMetaSize(meta.dev_path): |
2178 |
raise errors.BlockDeviceError("Invalid meta device size") |
2179 |
cls._InitMeta(cls._FindUnusedMinor(), meta.dev_path) |
2180 |
if not cls._IsValidMeta(meta.dev_path): |
2181 |
raise errors.BlockDeviceError("Cannot initalize meta device") |
2182 |
return cls(unique_id, children)
|
2183 |
|
2184 |
|
2185 |
DEV_MAP = { |
2186 |
constants.LD_LV: LogicalVolume, |
2187 |
constants.LD_MD_R1: MDRaid1, |
2188 |
constants.LD_DRBD7: DRBDev, |
2189 |
constants.LD_DRBD8: DRBD8, |
2190 |
} |
2191 |
|
2192 |
|
2193 |
def FindDevice(dev_type, unique_id, children): |
2194 |
"""Search for an existing, assembled device.
|
2195 |
|
2196 |
This will succeed only if the device exists and is assembled, but it
|
2197 |
does not do any actions in order to activate the device.
|
2198 |
|
2199 |
"""
|
2200 |
if dev_type not in DEV_MAP: |
2201 |
raise errors.ProgrammerError("Invalid block device type '%s'" % dev_type) |
2202 |
device = DEV_MAP[dev_type](unique_id, children) |
2203 |
if not device.Attach(): |
2204 |
return None |
2205 |
return device
|
2206 |
|
2207 |
|
2208 |
def AttachOrAssemble(dev_type, unique_id, children): |
2209 |
"""Try to attach or assemble an existing device.
|
2210 |
|
2211 |
This will attach to an existing assembled device or will assemble
|
2212 |
the device, as needed, to bring it fully up.
|
2213 |
|
2214 |
"""
|
2215 |
if dev_type not in DEV_MAP: |
2216 |
raise errors.ProgrammerError("Invalid block device type '%s'" % dev_type) |
2217 |
device = DEV_MAP[dev_type](unique_id, children) |
2218 |
if not device.Attach(): |
2219 |
device.Assemble() |
2220 |
if not device.Attach(): |
2221 |
raise errors.BlockDeviceError("Can't find a valid block device for" |
2222 |
" %s/%s/%s" %
|
2223 |
(dev_type, unique_id, children)) |
2224 |
return device
|
2225 |
|
2226 |
|
2227 |
def Create(dev_type, unique_id, children, size): |
2228 |
"""Create a device.
|
2229 |
|
2230 |
"""
|
2231 |
if dev_type not in DEV_MAP: |
2232 |
raise errors.ProgrammerError("Invalid block device type '%s'" % dev_type) |
2233 |
device = DEV_MAP[dev_type].Create(unique_id, children, size) |
2234 |
return device
|