22 |
22 |
"""Block device abstraction"""
|
23 |
23 |
|
24 |
24 |
import re
|
25 |
|
import time
|
26 |
25 |
import errno
|
27 |
|
import shlex
|
28 |
26 |
import stat
|
29 |
|
import pyparsing as pyp
|
30 |
27 |
import os
|
31 |
28 |
import logging
|
32 |
29 |
import math
|
... | ... | |
36 |
33 |
from ganeti import constants
|
37 |
34 |
from ganeti import objects
|
38 |
35 |
from ganeti import compat
|
39 |
|
from ganeti import netutils
|
40 |
36 |
from ganeti import pathutils
|
41 |
37 |
from ganeti import serializer
|
42 |
|
|
43 |
|
|
44 |
|
# Size of reads in _CanReadDevice
|
45 |
|
_DEVICE_READ_SIZE = 128 * 1024
|
|
38 |
from ganeti.block import drbd
|
|
39 |
from ganeti.block import base
|
46 |
40 |
|
47 |
41 |
|
48 |
42 |
class RbdShowmappedJsonError(Exception):
|
... | ... | |
52 |
46 |
pass
|
53 |
47 |
|
54 |
48 |
|
55 |
|
def _IgnoreError(fn, *args, **kwargs):
|
56 |
|
"""Executes the given function, ignoring BlockDeviceErrors.
|
57 |
|
|
58 |
|
This is used in order to simplify the execution of cleanup or
|
59 |
|
rollback functions.
|
60 |
|
|
61 |
|
@rtype: boolean
|
62 |
|
@return: True when fn didn't raise an exception, False otherwise
|
63 |
|
|
64 |
|
"""
|
65 |
|
try:
|
66 |
|
fn(*args, **kwargs)
|
67 |
|
return True
|
68 |
|
except errors.BlockDeviceError, err:
|
69 |
|
logging.warning("Caught BlockDeviceError but ignoring: %s", str(err))
|
70 |
|
return False
|
71 |
|
|
72 |
|
|
73 |
|
def _ThrowError(msg, *args):
|
74 |
|
"""Log an error to the node daemon and the raise an exception.
|
75 |
|
|
76 |
|
@type msg: string
|
77 |
|
@param msg: the text of the exception
|
78 |
|
@raise errors.BlockDeviceError
|
79 |
|
|
80 |
|
"""
|
81 |
|
if args:
|
82 |
|
msg = msg % args
|
83 |
|
logging.error(msg)
|
84 |
|
raise errors.BlockDeviceError(msg)
|
85 |
|
|
86 |
|
|
87 |
49 |
def _CheckResult(result):
|
88 |
50 |
"""Throws an error if the given result is a failed one.
|
89 |
51 |
|
... | ... | |
91 |
53 |
|
92 |
54 |
"""
|
93 |
55 |
if result.failed:
|
94 |
|
_ThrowError("Command: %s error: %s - %s", result.cmd, result.fail_reason,
|
95 |
|
result.output)
|
96 |
|
|
97 |
|
|
98 |
|
def _CanReadDevice(path):
|
99 |
|
"""Check if we can read from the given device.
|
100 |
|
|
101 |
|
This tries to read the first 128k of the device.
|
102 |
|
|
103 |
|
"""
|
104 |
|
try:
|
105 |
|
utils.ReadFile(path, size=_DEVICE_READ_SIZE)
|
106 |
|
return True
|
107 |
|
except EnvironmentError:
|
108 |
|
logging.warning("Can't read from device %s", path, exc_info=True)
|
109 |
|
return False
|
|
56 |
base.ThrowError("Command: %s error: %s - %s",
|
|
57 |
result.cmd, result.fail_reason, result.output)
|
110 |
58 |
|
111 |
59 |
|
112 |
60 |
def _GetForbiddenFileStoragePaths():
|
... | ... | |
219 |
167 |
_CheckFileStoragePath(path, allowed)
|
220 |
168 |
|
221 |
169 |
|
222 |
|
class BlockDev(object):
|
223 |
|
"""Block device abstract class.
|
224 |
|
|
225 |
|
A block device can be in the following states:
|
226 |
|
- not existing on the system, and by `Create()` it goes into:
|
227 |
|
- existing but not setup/not active, and by `Assemble()` goes into:
|
228 |
|
- active read-write and by `Open()` it goes into
|
229 |
|
- online (=used, or ready for use)
|
230 |
|
|
231 |
|
A device can also be online but read-only, however we are not using
|
232 |
|
the readonly state (LV has it, if needed in the future) and we are
|
233 |
|
usually looking at this like at a stack, so it's easier to
|
234 |
|
conceptualise the transition from not-existing to online and back
|
235 |
|
like a linear one.
|
236 |
|
|
237 |
|
The many different states of the device are due to the fact that we
|
238 |
|
need to cover many device types:
|
239 |
|
- logical volumes are created, lvchange -a y $lv, and used
|
240 |
|
- drbd devices are attached to a local disk/remote peer and made primary
|
241 |
|
|
242 |
|
A block device is identified by three items:
|
243 |
|
- the /dev path of the device (dynamic)
|
244 |
|
- a unique ID of the device (static)
|
245 |
|
- it's major/minor pair (dynamic)
|
246 |
|
|
247 |
|
Not all devices implement both the first two as distinct items. LVM
|
248 |
|
logical volumes have their unique ID (the pair volume group, logical
|
249 |
|
volume name) in a 1-to-1 relation to the dev path. For DRBD devices,
|
250 |
|
the /dev path is again dynamic and the unique id is the pair (host1,
|
251 |
|
dev1), (host2, dev2).
|
252 |
|
|
253 |
|
You can get to a device in two ways:
|
254 |
|
- creating the (real) device, which returns you
|
255 |
|
an attached instance (lvcreate)
|
256 |
|
- attaching of a python instance to an existing (real) device
|
257 |
|
|
258 |
|
The second point, the attachment to a device, is different
|
259 |
|
depending on whether the device is assembled or not. At init() time,
|
260 |
|
we search for a device with the same unique_id as us. If found,
|
261 |
|
good. It also means that the device is already assembled. If not,
|
262 |
|
after assembly we'll have our correct major/minor.
|
263 |
|
|
264 |
|
"""
|
265 |
|
def __init__(self, unique_id, children, size, params):
|
266 |
|
self._children = children
|
267 |
|
self.dev_path = None
|
268 |
|
self.unique_id = unique_id
|
269 |
|
self.major = None
|
270 |
|
self.minor = None
|
271 |
|
self.attached = False
|
272 |
|
self.size = size
|
273 |
|
self.params = params
|
274 |
|
|
275 |
|
def Assemble(self):
|
276 |
|
"""Assemble the device from its components.
|
277 |
|
|
278 |
|
Implementations of this method by child classes must ensure that:
|
279 |
|
- after the device has been assembled, it knows its major/minor
|
280 |
|
numbers; this allows other devices (usually parents) to probe
|
281 |
|
correctly for their children
|
282 |
|
- calling this method on an existing, in-use device is safe
|
283 |
|
- if the device is already configured (and in an OK state),
|
284 |
|
this method is idempotent
|
285 |
|
|
286 |
|
"""
|
287 |
|
pass
|
288 |
|
|
289 |
|
def Attach(self):
|
290 |
|
"""Find a device which matches our config and attach to it.
|
291 |
|
|
292 |
|
"""
|
293 |
|
raise NotImplementedError
|
294 |
|
|
295 |
|
def Close(self):
|
296 |
|
"""Notifies that the device will no longer be used for I/O.
|
297 |
|
|
298 |
|
"""
|
299 |
|
raise NotImplementedError
|
300 |
|
|
301 |
|
@classmethod
|
302 |
|
def Create(cls, unique_id, children, size, params, excl_stor):
|
303 |
|
"""Create the device.
|
304 |
|
|
305 |
|
If the device cannot be created, it will return None
|
306 |
|
instead. Error messages go to the logging system.
|
307 |
|
|
308 |
|
Note that for some devices, the unique_id is used, and for other,
|
309 |
|
the children. The idea is that these two, taken together, are
|
310 |
|
enough for both creation and assembly (later).
|
311 |
|
|
312 |
|
"""
|
313 |
|
raise NotImplementedError
|
314 |
|
|
315 |
|
def Remove(self):
|
316 |
|
"""Remove this device.
|
317 |
|
|
318 |
|
This makes sense only for some of the device types: LV and file
|
319 |
|
storage. Also note that if the device can't attach, the removal
|
320 |
|
can't be completed.
|
321 |
|
|
322 |
|
"""
|
323 |
|
raise NotImplementedError
|
324 |
|
|
325 |
|
def Rename(self, new_id):
|
326 |
|
"""Rename this device.
|
327 |
|
|
328 |
|
This may or may not make sense for a given device type.
|
329 |
|
|
330 |
|
"""
|
331 |
|
raise NotImplementedError
|
332 |
|
|
333 |
|
def Open(self, force=False):
|
334 |
|
"""Make the device ready for use.
|
335 |
|
|
336 |
|
This makes the device ready for I/O. For now, just the DRBD
|
337 |
|
devices need this.
|
338 |
|
|
339 |
|
The force parameter signifies that if the device has any kind of
|
340 |
|
--force thing, it should be used, we know what we are doing.
|
341 |
|
|
342 |
|
"""
|
343 |
|
raise NotImplementedError
|
344 |
|
|
345 |
|
def Shutdown(self):
|
346 |
|
"""Shut down the device, freeing its children.
|
347 |
|
|
348 |
|
This undoes the `Assemble()` work, except for the child
|
349 |
|
assembling; as such, the children on the device are still
|
350 |
|
assembled after this call.
|
351 |
|
|
352 |
|
"""
|
353 |
|
raise NotImplementedError
|
354 |
|
|
355 |
|
def SetSyncParams(self, params):
|
356 |
|
"""Adjust the synchronization parameters of the mirror.
|
357 |
|
|
358 |
|
In case this is not a mirroring device, this is no-op.
|
359 |
|
|
360 |
|
@param params: dictionary of LD level disk parameters related to the
|
361 |
|
synchronization.
|
362 |
|
@rtype: list
|
363 |
|
@return: a list of error messages, emitted both by the current node and by
|
364 |
|
children. An empty list means no errors.
|
365 |
|
|
366 |
|
"""
|
367 |
|
result = []
|
368 |
|
if self._children:
|
369 |
|
for child in self._children:
|
370 |
|
result.extend(child.SetSyncParams(params))
|
371 |
|
return result
|
372 |
|
|
373 |
|
def PauseResumeSync(self, pause):
|
374 |
|
"""Pause/Resume the sync of the mirror.
|
375 |
|
|
376 |
|
In case this is not a mirroring device, this is no-op.
|
377 |
|
|
378 |
|
@param pause: Whether to pause or resume
|
379 |
|
|
380 |
|
"""
|
381 |
|
result = True
|
382 |
|
if self._children:
|
383 |
|
for child in self._children:
|
384 |
|
result = result and child.PauseResumeSync(pause)
|
385 |
|
return result
|
386 |
|
|
387 |
|
def GetSyncStatus(self):
|
388 |
|
"""Returns the sync status of the device.
|
389 |
|
|
390 |
|
If this device is a mirroring device, this function returns the
|
391 |
|
status of the mirror.
|
392 |
|
|
393 |
|
If sync_percent is None, it means the device is not syncing.
|
394 |
|
|
395 |
|
If estimated_time is None, it means we can't estimate
|
396 |
|
the time needed, otherwise it's the time left in seconds.
|
397 |
|
|
398 |
|
If is_degraded is True, it means the device is missing
|
399 |
|
redundancy. This is usually a sign that something went wrong in
|
400 |
|
the device setup, if sync_percent is None.
|
401 |
|
|
402 |
|
The ldisk parameter represents the degradation of the local
|
403 |
|
data. This is only valid for some devices, the rest will always
|
404 |
|
return False (not degraded).
|
405 |
|
|
406 |
|
@rtype: objects.BlockDevStatus
|
407 |
|
|
408 |
|
"""
|
409 |
|
return objects.BlockDevStatus(dev_path=self.dev_path,
|
410 |
|
major=self.major,
|
411 |
|
minor=self.minor,
|
412 |
|
sync_percent=None,
|
413 |
|
estimated_time=None,
|
414 |
|
is_degraded=False,
|
415 |
|
ldisk_status=constants.LDS_OKAY)
|
416 |
|
|
417 |
|
def CombinedSyncStatus(self):
|
418 |
|
"""Calculate the mirror status recursively for our children.
|
419 |
|
|
420 |
|
The return value is the same as for `GetSyncStatus()` except the
|
421 |
|
minimum percent and maximum time are calculated across our
|
422 |
|
children.
|
423 |
|
|
424 |
|
@rtype: objects.BlockDevStatus
|
425 |
|
|
426 |
|
"""
|
427 |
|
status = self.GetSyncStatus()
|
428 |
|
|
429 |
|
min_percent = status.sync_percent
|
430 |
|
max_time = status.estimated_time
|
431 |
|
is_degraded = status.is_degraded
|
432 |
|
ldisk_status = status.ldisk_status
|
433 |
|
|
434 |
|
if self._children:
|
435 |
|
for child in self._children:
|
436 |
|
child_status = child.GetSyncStatus()
|
437 |
|
|
438 |
|
if min_percent is None:
|
439 |
|
min_percent = child_status.sync_percent
|
440 |
|
elif child_status.sync_percent is not None:
|
441 |
|
min_percent = min(min_percent, child_status.sync_percent)
|
442 |
|
|
443 |
|
if max_time is None:
|
444 |
|
max_time = child_status.estimated_time
|
445 |
|
elif child_status.estimated_time is not None:
|
446 |
|
max_time = max(max_time, child_status.estimated_time)
|
447 |
|
|
448 |
|
is_degraded = is_degraded or child_status.is_degraded
|
449 |
|
|
450 |
|
if ldisk_status is None:
|
451 |
|
ldisk_status = child_status.ldisk_status
|
452 |
|
elif child_status.ldisk_status is not None:
|
453 |
|
ldisk_status = max(ldisk_status, child_status.ldisk_status)
|
454 |
|
|
455 |
|
return objects.BlockDevStatus(dev_path=self.dev_path,
|
456 |
|
major=self.major,
|
457 |
|
minor=self.minor,
|
458 |
|
sync_percent=min_percent,
|
459 |
|
estimated_time=max_time,
|
460 |
|
is_degraded=is_degraded,
|
461 |
|
ldisk_status=ldisk_status)
|
462 |
|
|
463 |
|
def SetInfo(self, text):
|
464 |
|
"""Update metadata with info text.
|
465 |
|
|
466 |
|
Only supported for some device types.
|
467 |
|
|
468 |
|
"""
|
469 |
|
for child in self._children:
|
470 |
|
child.SetInfo(text)
|
471 |
|
|
472 |
|
def Grow(self, amount, dryrun, backingstore):
|
473 |
|
"""Grow the block device.
|
474 |
|
|
475 |
|
@type amount: integer
|
476 |
|
@param amount: the amount (in mebibytes) to grow with
|
477 |
|
@type dryrun: boolean
|
478 |
|
@param dryrun: whether to execute the operation in simulation mode
|
479 |
|
only, without actually increasing the size
|
480 |
|
@param backingstore: whether to execute the operation on backing storage
|
481 |
|
only, or on "logical" storage only; e.g. DRBD is logical storage,
|
482 |
|
whereas LVM, file, RBD are backing storage
|
483 |
|
|
484 |
|
"""
|
485 |
|
raise NotImplementedError
|
486 |
|
|
487 |
|
def GetActualSize(self):
|
488 |
|
"""Return the actual disk size.
|
489 |
|
|
490 |
|
@note: the device needs to be active when this is called
|
491 |
|
|
492 |
|
"""
|
493 |
|
assert self.attached, "BlockDevice not attached in GetActualSize()"
|
494 |
|
result = utils.RunCmd(["blockdev", "--getsize64", self.dev_path])
|
495 |
|
if result.failed:
|
496 |
|
_ThrowError("blockdev failed (%s): %s",
|
497 |
|
result.fail_reason, result.output)
|
498 |
|
try:
|
499 |
|
sz = int(result.output.strip())
|
500 |
|
except (ValueError, TypeError), err:
|
501 |
|
_ThrowError("Failed to parse blockdev output: %s", str(err))
|
502 |
|
return sz
|
503 |
|
|
504 |
|
def __repr__(self):
|
505 |
|
return ("<%s: unique_id: %s, children: %s, %s:%s, %s>" %
|
506 |
|
(self.__class__, self.unique_id, self._children,
|
507 |
|
self.major, self.minor, self.dev_path))
|
508 |
|
|
509 |
|
|
510 |
|
class LogicalVolume(BlockDev):
|
|
170 |
class LogicalVolume(base.BlockDev):
|
511 |
171 |
"""Logical Volume block device.
|
512 |
172 |
|
513 |
173 |
"""
|
... | ... | |
586 |
246 |
msg = "No (empty) PVs found"
|
587 |
247 |
else:
|
588 |
248 |
msg = "Can't compute PV info for vg %s" % vg_name
|
589 |
|
_ThrowError(msg)
|
|
249 |
base.ThrowError(msg)
|
590 |
250 |
pvs_info.sort(key=(lambda pv: pv.free), reverse=True)
|
591 |
251 |
|
592 |
252 |
pvlist = [pv.name for pv in pvs_info]
|
593 |
253 |
if compat.any(":" in v for v in pvlist):
|
594 |
|
_ThrowError("Some of your PVs have the invalid character ':' in their"
|
595 |
|
" name, this is not supported - please filter them out"
|
596 |
|
" in lvm.conf using either 'filter' or 'preferred_names'")
|
|
254 |
base.ThrowError("Some of your PVs have the invalid character ':' in their"
|
|
255 |
" name, this is not supported - please filter them out"
|
|
256 |
" in lvm.conf using either 'filter' or 'preferred_names'")
|
597 |
257 |
|
598 |
258 |
current_pvs = len(pvlist)
|
599 |
259 |
desired_stripes = params[constants.LDP_STRIPES]
|
... | ... | |
608 |
268 |
pvlist = cls._GetEmptyPvNames(pvs_info, req_pvs)
|
609 |
269 |
current_pvs = len(pvlist)
|
610 |
270 |
if current_pvs < req_pvs:
|
611 |
|
_ThrowError("Not enough empty PVs to create a disk of %d MB:"
|
612 |
|
" %d available, %d needed", size, current_pvs, req_pvs)
|
|
271 |
base.ThrowError("Not enough empty PVs to create a disk of %d MB:"
|
|
272 |
" %d available, %d needed", size, current_pvs, req_pvs)
|
613 |
273 |
assert current_pvs == len(pvlist)
|
614 |
274 |
if stripes > current_pvs:
|
615 |
275 |
# No warning issued for this, as it's no surprise
|
... | ... | |
623 |
283 |
# The size constraint should have been checked from the master before
|
624 |
284 |
# calling the create function.
|
625 |
285 |
if free_size < size:
|
626 |
|
_ThrowError("Not enough free space: required %s,"
|
627 |
|
" available %s", size, free_size)
|
|
286 |
base.ThrowError("Not enough free space: required %s,"
|
|
287 |
" available %s", size, free_size)
|
628 |
288 |
|
629 |
289 |
# If the free space is not well distributed, we won't be able to
|
630 |
290 |
# create an optimally-striped volume; in that case, we want to try
|
... | ... | |
636 |
296 |
if not result.failed:
|
637 |
297 |
break
|
638 |
298 |
if result.failed:
|
639 |
|
_ThrowError("LV create failed (%s): %s",
|
640 |
|
result.fail_reason, result.output)
|
|
299 |
base.ThrowError("LV create failed (%s): %s",
|
|
300 |
result.fail_reason, result.output)
|
641 |
301 |
return LogicalVolume(unique_id, children, size, params)
|
642 |
302 |
|
643 |
303 |
@staticmethod
|
... | ... | |
795 |
455 |
if (not cls._VALID_NAME_RE.match(name) or
|
796 |
456 |
name in cls._INVALID_NAMES or
|
797 |
457 |
compat.any(substring in name for substring in cls._INVALID_SUBSTRINGS)):
|
798 |
|
_ThrowError("Invalid LVM name '%s'", name)
|
|
458 |
base.ThrowError("Invalid LVM name '%s'", name)
|
799 |
459 |
|
800 |
460 |
def Remove(self):
|
801 |
461 |
"""Remove this logical volume.
|
... | ... | |
807 |
467 |
result = utils.RunCmd(["lvremove", "-f", "%s/%s" %
|
808 |
468 |
(self._vg_name, self._lv_name)])
|
809 |
469 |
if result.failed:
|
810 |
|
_ThrowError("Can't lvremove: %s - %s", result.fail_reason, result.output)
|
|
470 |
base.ThrowError("Can't lvremove: %s - %s",
|
|
471 |
result.fail_reason, result.output)
|
811 |
472 |
|
812 |
473 |
def Rename(self, new_id):
|
813 |
474 |
"""Rename this logical volume.
|
... | ... | |
822 |
483 |
(self._vg_name, new_vg))
|
823 |
484 |
result = utils.RunCmd(["lvrename", new_vg, self._lv_name, new_name])
|
824 |
485 |
if result.failed:
|
825 |
|
_ThrowError("Failed to rename the logical volume: %s", result.output)
|
|
486 |
base.ThrowError("Failed to rename the logical volume: %s", result.output)
|
826 |
487 |
self._lv_name = new_name
|
827 |
488 |
self.dev_path = utils.PathJoin("/dev", self._vg_name, self._lv_name)
|
828 |
489 |
|
... | ... | |
901 |
562 |
"""
|
902 |
563 |
result = utils.RunCmd(["lvchange", "-ay", self.dev_path])
|
903 |
564 |
if result.failed:
|
904 |
|
_ThrowError("Can't activate lv %s: %s", self.dev_path, result.output)
|
|
565 |
base.ThrowError("Can't activate lv %s: %s", self.dev_path, result.output)
|
905 |
566 |
|
906 |
567 |
def Shutdown(self):
|
907 |
568 |
"""Shutdown the device.
|
... | ... | |
973 |
634 |
|
974 |
635 |
# remove existing snapshot if found
|
975 |
636 |
snap = LogicalVolume((self._vg_name, snap_name), None, size, self.params)
|
976 |
|
_IgnoreError(snap.Remove)
|
|
637 |
base.IgnoreError(snap.Remove)
|
977 |
638 |
|
978 |
639 |
vg_info = self.GetVGInfo([self._vg_name], False)
|
979 |
640 |
if not vg_info:
|
980 |
|
_ThrowError("Can't compute VG info for vg %s", self._vg_name)
|
|
641 |
base.ThrowError("Can't compute VG info for vg %s", self._vg_name)
|
981 |
642 |
free_size, _, _ = vg_info[0]
|
982 |
643 |
if free_size < size:
|
983 |
|
_ThrowError("Not enough free space: required %s,"
|
984 |
|
" available %s", size, free_size)
|
|
644 |
base.ThrowError("Not enough free space: required %s,"
|
|
645 |
" available %s", size, free_size)
|
985 |
646 |
|
986 |
647 |
_CheckResult(utils.RunCmd(["lvcreate", "-L%dm" % size, "-s",
|
987 |
648 |
"-n%s" % snap_name, self.dev_path]))
|
... | ... | |
1006 |
667 |
"""Update metadata with info text.
|
1007 |
668 |
|
1008 |
669 |
"""
|
1009 |
|
BlockDev.SetInfo(self, text)
|
|
670 |
base.BlockDev.SetInfo(self, text)
|
1010 |
671 |
|
1011 |
672 |
self._RemoveOldInfo()
|
1012 |
673 |
|
... | ... | |
1027 |
688 |
return
|
1028 |
689 |
if self.pe_size is None or self.stripe_count is None:
|
1029 |
690 |
if not self.Attach():
|
1030 |
|
_ThrowError("Can't attach to LV during Grow()")
|
|
691 |
base.ThrowError("Can't attach to LV during Grow()")
|
1031 |
692 |
full_stripe_size = self.pe_size * self.stripe_count
|
1032 |
693 |
rest = amount % full_stripe_size
|
1033 |
694 |
if rest != 0:
|
... | ... | |
1043 |
704 |
result = utils.RunCmd(cmd + ["--alloc", alloc_policy, self.dev_path])
|
1044 |
705 |
if not result.failed:
|
1045 |
706 |
return
|
1046 |
|
_ThrowError("Can't grow LV %s: %s", self.dev_path, result.output)
|
1047 |
|
|
1048 |
|
|
1049 |
|
class DRBD8Status(object):
|
1050 |
|
"""A DRBD status representation class.
|
1051 |
|
|
1052 |
|
Note that this doesn't support unconfigured devices (cs:Unconfigured).
|
1053 |
|
|
1054 |
|
"""
|
1055 |
|
UNCONF_RE = re.compile(r"\s*[0-9]+:\s*cs:Unconfigured$")
|
1056 |
|
LINE_RE = re.compile(r"\s*[0-9]+:\s*cs:(\S+)\s+(?:st|ro):([^/]+)/(\S+)"
|
1057 |
|
"\s+ds:([^/]+)/(\S+)\s+.*$")
|
1058 |
|
SYNC_RE = re.compile(r"^.*\ssync'ed:\s*([0-9.]+)%.*"
|
1059 |
|
# Due to a bug in drbd in the kernel, introduced in
|
1060 |
|
# commit 4b0715f096 (still unfixed as of 2011-08-22)
|
1061 |
|
"(?:\s|M)"
|
1062 |
|
"finish: ([0-9]+):([0-9]+):([0-9]+)\s.*$")
|
1063 |
|
|
1064 |
|
CS_UNCONFIGURED = "Unconfigured"
|
1065 |
|
CS_STANDALONE = "StandAlone"
|
1066 |
|
CS_WFCONNECTION = "WFConnection"
|
1067 |
|
CS_WFREPORTPARAMS = "WFReportParams"
|
1068 |
|
CS_CONNECTED = "Connected"
|
1069 |
|
CS_STARTINGSYNCS = "StartingSyncS"
|
1070 |
|
CS_STARTINGSYNCT = "StartingSyncT"
|
1071 |
|
CS_WFBITMAPS = "WFBitMapS"
|
1072 |
|
CS_WFBITMAPT = "WFBitMapT"
|
1073 |
|
CS_WFSYNCUUID = "WFSyncUUID"
|
1074 |
|
CS_SYNCSOURCE = "SyncSource"
|
1075 |
|
CS_SYNCTARGET = "SyncTarget"
|
1076 |
|
CS_PAUSEDSYNCS = "PausedSyncS"
|
1077 |
|
CS_PAUSEDSYNCT = "PausedSyncT"
|
1078 |
|
CSET_SYNC = compat.UniqueFrozenset([
|
1079 |
|
CS_WFREPORTPARAMS,
|
1080 |
|
CS_STARTINGSYNCS,
|
1081 |
|
CS_STARTINGSYNCT,
|
1082 |
|
CS_WFBITMAPS,
|
1083 |
|
CS_WFBITMAPT,
|
1084 |
|
CS_WFSYNCUUID,
|
1085 |
|
CS_SYNCSOURCE,
|
1086 |
|
CS_SYNCTARGET,
|
1087 |
|
CS_PAUSEDSYNCS,
|
1088 |
|
CS_PAUSEDSYNCT,
|
1089 |
|
])
|
1090 |
|
|
1091 |
|
DS_DISKLESS = "Diskless"
|
1092 |
|
DS_ATTACHING = "Attaching" # transient state
|
1093 |
|
DS_FAILED = "Failed" # transient state, next: diskless
|
1094 |
|
DS_NEGOTIATING = "Negotiating" # transient state
|
1095 |
|
DS_INCONSISTENT = "Inconsistent" # while syncing or after creation
|
1096 |
|
DS_OUTDATED = "Outdated"
|
1097 |
|
DS_DUNKNOWN = "DUnknown" # shown for peer disk when not connected
|
1098 |
|
DS_CONSISTENT = "Consistent"
|
1099 |
|
DS_UPTODATE = "UpToDate" # normal state
|
1100 |
|
|
1101 |
|
RO_PRIMARY = "Primary"
|
1102 |
|
RO_SECONDARY = "Secondary"
|
1103 |
|
RO_UNKNOWN = "Unknown"
|
1104 |
|
|
1105 |
|
def __init__(self, procline):
|
1106 |
|
u = self.UNCONF_RE.match(procline)
|
1107 |
|
if u:
|
1108 |
|
self.cstatus = self.CS_UNCONFIGURED
|
1109 |
|
self.lrole = self.rrole = self.ldisk = self.rdisk = None
|
1110 |
|
else:
|
1111 |
|
m = self.LINE_RE.match(procline)
|
1112 |
|
if not m:
|
1113 |
|
raise errors.BlockDeviceError("Can't parse input data '%s'" % procline)
|
1114 |
|
self.cstatus = m.group(1)
|
1115 |
|
self.lrole = m.group(2)
|
1116 |
|
self.rrole = m.group(3)
|
1117 |
|
self.ldisk = m.group(4)
|
1118 |
|
self.rdisk = m.group(5)
|
1119 |
|
|
1120 |
|
# end reading of data from the LINE_RE or UNCONF_RE
|
1121 |
|
|
1122 |
|
self.is_standalone = self.cstatus == self.CS_STANDALONE
|
1123 |
|
self.is_wfconn = self.cstatus == self.CS_WFCONNECTION
|
1124 |
|
self.is_connected = self.cstatus == self.CS_CONNECTED
|
1125 |
|
self.is_primary = self.lrole == self.RO_PRIMARY
|
1126 |
|
self.is_secondary = self.lrole == self.RO_SECONDARY
|
1127 |
|
self.peer_primary = self.rrole == self.RO_PRIMARY
|
1128 |
|
self.peer_secondary = self.rrole == self.RO_SECONDARY
|
1129 |
|
self.both_primary = self.is_primary and self.peer_primary
|
1130 |
|
self.both_secondary = self.is_secondary and self.peer_secondary
|
1131 |
|
|
1132 |
|
self.is_diskless = self.ldisk == self.DS_DISKLESS
|
1133 |
|
self.is_disk_uptodate = self.ldisk == self.DS_UPTODATE
|
1134 |
|
|
1135 |
|
self.is_in_resync = self.cstatus in self.CSET_SYNC
|
1136 |
|
self.is_in_use = self.cstatus != self.CS_UNCONFIGURED
|
1137 |
|
|
1138 |
|
m = self.SYNC_RE.match(procline)
|
1139 |
|
if m:
|
1140 |
|
self.sync_percent = float(m.group(1))
|
1141 |
|
hours = int(m.group(2))
|
1142 |
|
minutes = int(m.group(3))
|
1143 |
|
seconds = int(m.group(4))
|
1144 |
|
self.est_time = hours * 3600 + minutes * 60 + seconds
|
1145 |
|
else:
|
1146 |
|
# we have (in this if branch) no percent information, but if
|
1147 |
|
# we're resyncing we need to 'fake' a sync percent information,
|
1148 |
|
# as this is how cmdlib determines if it makes sense to wait for
|
1149 |
|
# resyncing or not
|
1150 |
|
if self.is_in_resync:
|
1151 |
|
self.sync_percent = 0
|
1152 |
|
else:
|
1153 |
|
self.sync_percent = None
|
1154 |
|
self.est_time = None
|
1155 |
|
|
1156 |
|
|
1157 |
|
class BaseDRBD(BlockDev): # pylint: disable=W0223
|
1158 |
|
"""Base DRBD class.
|
1159 |
|
|
1160 |
|
This class contains a few bits of common functionality between the
|
1161 |
|
0.7 and 8.x versions of DRBD.
|
1162 |
|
|
1163 |
|
"""
|
1164 |
|
_VERSION_RE = re.compile(r"^version: (\d+)\.(\d+)\.(\d+)(?:\.\d+)?"
|
1165 |
|
r" \(api:(\d+)/proto:(\d+)(?:-(\d+))?\)")
|
1166 |
|
_VALID_LINE_RE = re.compile("^ *([0-9]+): cs:([^ ]+).*$")
|
1167 |
|
_UNUSED_LINE_RE = re.compile("^ *([0-9]+): cs:Unconfigured$")
|
1168 |
|
|
1169 |
|
_DRBD_MAJOR = 147
|
1170 |
|
_ST_UNCONFIGURED = "Unconfigured"
|
1171 |
|
_ST_WFCONNECTION = "WFConnection"
|
1172 |
|
_ST_CONNECTED = "Connected"
|
1173 |
|
|
1174 |
|
_STATUS_FILE = constants.DRBD_STATUS_FILE
|
1175 |
|
_USERMODE_HELPER_FILE = "/sys/module/drbd/parameters/usermode_helper"
|
1176 |
|
|
1177 |
|
@staticmethod
|
1178 |
|
def _GetProcData(filename=_STATUS_FILE):
|
1179 |
|
"""Return data from /proc/drbd.
|
1180 |
|
|
1181 |
|
"""
|
1182 |
|
try:
|
1183 |
|
data = utils.ReadFile(filename).splitlines()
|
1184 |
|
except EnvironmentError, err:
|
1185 |
|
if err.errno == errno.ENOENT:
|
1186 |
|
_ThrowError("The file %s cannot be opened, check if the module"
|
1187 |
|
" is loaded (%s)", filename, str(err))
|
1188 |
|
else:
|
1189 |
|
_ThrowError("Can't read the DRBD proc file %s: %s", filename, str(err))
|
1190 |
|
if not data:
|
1191 |
|
_ThrowError("Can't read any data from %s", filename)
|
1192 |
|
return data
|
1193 |
|
|
1194 |
|
@classmethod
|
1195 |
|
def _MassageProcData(cls, data):
|
1196 |
|
"""Transform the output of _GetProdData into a nicer form.
|
1197 |
|
|
1198 |
|
@return: a dictionary of minor: joined lines from /proc/drbd
|
1199 |
|
for that minor
|
1200 |
|
|
1201 |
|
"""
|
1202 |
|
results = {}
|
1203 |
|
old_minor = old_line = None
|
1204 |
|
for line in data:
|
1205 |
|
if not line: # completely empty lines, as can be returned by drbd8.0+
|
1206 |
|
continue
|
1207 |
|
lresult = cls._VALID_LINE_RE.match(line)
|
1208 |
|
if lresult is not None:
|
1209 |
|
if old_minor is not None:
|
1210 |
|
results[old_minor] = old_line
|
1211 |
|
old_minor = int(lresult.group(1))
|
1212 |
|
old_line = line
|
1213 |
|
else:
|
1214 |
|
if old_minor is not None:
|
1215 |
|
old_line += " " + line.strip()
|
1216 |
|
# add last line
|
1217 |
|
if old_minor is not None:
|
1218 |
|
results[old_minor] = old_line
|
1219 |
|
return results
|
|
707 |
base.ThrowError("Can't grow LV %s: %s", self.dev_path, result.output)
|
1220 |
708 |
|
1221 |
|
@classmethod
|
1222 |
|
def _GetVersion(cls, proc_data):
|
1223 |
|
"""Return the DRBD version.
|
1224 |
|
|
1225 |
|
This will return a dict with keys:
|
1226 |
|
- k_major
|
1227 |
|
- k_minor
|
1228 |
|
- k_point
|
1229 |
|
- api
|
1230 |
|
- proto
|
1231 |
|
- proto2 (only on drbd > 8.2.X)
|
1232 |
|
|
1233 |
|
"""
|
1234 |
|
first_line = proc_data[0].strip()
|
1235 |
|
version = cls._VERSION_RE.match(first_line)
|
1236 |
|
if not version:
|
1237 |
|
raise errors.BlockDeviceError("Can't parse DRBD version from '%s'" %
|
1238 |
|
first_line)
|
1239 |
|
|
1240 |
|
values = version.groups()
|
1241 |
|
retval = {
|
1242 |
|
"k_major": int(values[0]),
|
1243 |
|
"k_minor": int(values[1]),
|
1244 |
|
"k_point": int(values[2]),
|
1245 |
|
"api": int(values[3]),
|
1246 |
|
"proto": int(values[4]),
|
1247 |
|
}
|
1248 |
|
if values[5] is not None:
|
1249 |
|
retval["proto2"] = values[5]
|
1250 |
|
|
1251 |
|
return retval
|
1252 |
|
|
1253 |
|
@staticmethod
|
1254 |
|
def GetUsermodeHelper(filename=_USERMODE_HELPER_FILE):
|
1255 |
|
"""Returns DRBD usermode_helper currently set.
|
1256 |
|
|
1257 |
|
"""
|
1258 |
|
try:
|
1259 |
|
helper = utils.ReadFile(filename).splitlines()[0]
|
1260 |
|
except EnvironmentError, err:
|
1261 |
|
if err.errno == errno.ENOENT:
|
1262 |
|
_ThrowError("The file %s cannot be opened, check if the module"
|
1263 |
|
" is loaded (%s)", filename, str(err))
|
1264 |
|
else:
|
1265 |
|
_ThrowError("Can't read DRBD helper file %s: %s", filename, str(err))
|
1266 |
|
if not helper:
|
1267 |
|
_ThrowError("Can't read any data from %s", filename)
|
1268 |
|
return helper
|
1269 |
|
|
1270 |
|
@staticmethod
|
1271 |
|
def _DevPath(minor):
|
1272 |
|
"""Return the path to a drbd device for a given minor.
|
1273 |
|
|
1274 |
|
"""
|
1275 |
|
return "/dev/drbd%d" % minor
|
1276 |
|
|
1277 |
|
@classmethod
|
1278 |
|
def GetUsedDevs(cls):
|
1279 |
|
"""Compute the list of used DRBD devices.
|
1280 |
|
|
1281 |
|
"""
|
1282 |
|
data = cls._GetProcData()
|
1283 |
|
|
1284 |
|
used_devs = {}
|
1285 |
|
for line in data:
|
1286 |
|
match = cls._VALID_LINE_RE.match(line)
|
1287 |
|
if not match:
|
1288 |
|
continue
|
1289 |
|
minor = int(match.group(1))
|
1290 |
|
state = match.group(2)
|
1291 |
|
if state == cls._ST_UNCONFIGURED:
|
1292 |
|
continue
|
1293 |
|
used_devs[minor] = state, line
|
1294 |
|
|
1295 |
|
return used_devs
|
1296 |
|
|
1297 |
|
def _SetFromMinor(self, minor):
|
1298 |
|
"""Set our parameters based on the given minor.
|
1299 |
|
|
1300 |
|
This sets our minor variable and our dev_path.
|
1301 |
|
|
1302 |
|
"""
|
1303 |
|
if minor is None:
|
1304 |
|
self.minor = self.dev_path = None
|
1305 |
|
self.attached = False
|
1306 |
|
else:
|
1307 |
|
self.minor = minor
|
1308 |
|
self.dev_path = self._DevPath(minor)
|
1309 |
|
self.attached = True
|
1310 |
|
|
1311 |
|
@staticmethod
|
1312 |
|
def _CheckMetaSize(meta_device):
|
1313 |
|
"""Check if the given meta device looks like a valid one.
|
1314 |
|
|
1315 |
|
This currently only checks the size, which must be around
|
1316 |
|
128MiB.
|
1317 |
|
|
1318 |
|
"""
|
1319 |
|
result = utils.RunCmd(["blockdev", "--getsize", meta_device])
|
1320 |
|
if result.failed:
|
1321 |
|
_ThrowError("Failed to get device size: %s - %s",
|
1322 |
|
result.fail_reason, result.output)
|
1323 |
|
try:
|
1324 |
|
sectors = int(result.stdout)
|
1325 |
|
except (TypeError, ValueError):
|
1326 |
|
_ThrowError("Invalid output from blockdev: '%s'", result.stdout)
|
1327 |
|
num_bytes = sectors * 512
|
1328 |
|
if num_bytes < 128 * 1024 * 1024: # less than 128MiB
|
1329 |
|
_ThrowError("Meta device too small (%.2fMib)", (num_bytes / 1024 / 1024))
|
1330 |
|
# the maximum *valid* size of the meta device when living on top
|
1331 |
|
# of LVM is hard to compute: it depends on the number of stripes
|
1332 |
|
# and the PE size; e.g. a 2-stripe, 64MB PE will result in a 128MB
|
1333 |
|
# (normal size), but an eight-stripe 128MB PE will result in a 1GB
|
1334 |
|
# size meta device; as such, we restrict it to 1GB (a little bit
|
1335 |
|
# too generous, but making assumptions about PE size is hard)
|
1336 |
|
if num_bytes > 1024 * 1024 * 1024:
|
1337 |
|
_ThrowError("Meta device too big (%.2fMiB)", (num_bytes / 1024 / 1024))
|
1338 |
|
|
1339 |
|
def Rename(self, new_id):
|
1340 |
|
"""Rename a device.
|
1341 |
|
|
1342 |
|
This is not supported for drbd devices.
|
1343 |
|
|
1344 |
|
"""
|
1345 |
|
raise errors.ProgrammerError("Can't rename a drbd device")
|
1346 |
|
|
1347 |
|
|
1348 |
|
class DRBD8(BaseDRBD):
|
1349 |
|
"""DRBD v8.x block device.
|
1350 |
|
|
1351 |
|
This implements the local host part of the DRBD device, i.e. it
|
1352 |
|
doesn't do anything to the supposed peer. If you need a fully
|
1353 |
|
connected DRBD pair, you need to use this class on both hosts.
|
1354 |
|
|
1355 |
|
The unique_id for the drbd device is a (local_ip, local_port,
|
1356 |
|
remote_ip, remote_port, local_minor, secret) tuple, and it must have
|
1357 |
|
two children: the data device and the meta_device. The meta device
|
1358 |
|
is checked for valid size and is zeroed on create.
|
1359 |
|
|
1360 |
|
"""
|
1361 |
|
_MAX_MINORS = 255
|
1362 |
|
_PARSE_SHOW = None
|
1363 |
|
|
1364 |
|
# timeout constants
|
1365 |
|
_NET_RECONFIG_TIMEOUT = 60
|
1366 |
|
|
1367 |
|
# command line options for barriers
|
1368 |
|
_DISABLE_DISK_OPTION = "--no-disk-barrier" # -a
|
1369 |
|
_DISABLE_DRAIN_OPTION = "--no-disk-drain" # -D
|
1370 |
|
_DISABLE_FLUSH_OPTION = "--no-disk-flushes" # -i
|
1371 |
|
_DISABLE_META_FLUSH_OPTION = "--no-md-flushes" # -m
|
1372 |
|
|
1373 |
|
def __init__(self, unique_id, children, size, params):
|
1374 |
|
if children and children.count(None) > 0:
|
1375 |
|
children = []
|
1376 |
|
if len(children) not in (0, 2):
|
1377 |
|
raise ValueError("Invalid configuration data %s" % str(children))
|
1378 |
|
if not isinstance(unique_id, (tuple, list)) or len(unique_id) != 6:
|
1379 |
|
raise ValueError("Invalid configuration data %s" % str(unique_id))
|
1380 |
|
(self._lhost, self._lport,
|
1381 |
|
self._rhost, self._rport,
|
1382 |
|
self._aminor, self._secret) = unique_id
|
1383 |
|
if children:
|
1384 |
|
if not _CanReadDevice(children[1].dev_path):
|
1385 |
|
logging.info("drbd%s: Ignoring unreadable meta device", self._aminor)
|
1386 |
|
children = []
|
1387 |
|
super(DRBD8, self).__init__(unique_id, children, size, params)
|
1388 |
|
self.major = self._DRBD_MAJOR
|
1389 |
|
version = self._GetVersion(self._GetProcData())
|
1390 |
|
if version["k_major"] != 8:
|
1391 |
|
_ThrowError("Mismatch in DRBD kernel version and requested ganeti"
|
1392 |
|
" usage: kernel is %s.%s, ganeti wants 8.x",
|
1393 |
|
version["k_major"], version["k_minor"])
|
1394 |
|
|
1395 |
|
if (self._lhost is not None and self._lhost == self._rhost and
|
1396 |
|
self._lport == self._rport):
|
1397 |
|
raise ValueError("Invalid configuration data, same local/remote %s" %
|
1398 |
|
(unique_id,))
|
1399 |
|
self.Attach()
|
1400 |
|
|
1401 |
|
@classmethod
|
1402 |
|
def _InitMeta(cls, minor, dev_path):
|
1403 |
|
"""Initialize a meta device.
|
1404 |
|
|
1405 |
|
This will not work if the given minor is in use.
|
1406 |
|
|
1407 |
|
"""
|
1408 |
|
# Zero the metadata first, in order to make sure drbdmeta doesn't
|
1409 |
|
# try to auto-detect existing filesystems or similar (see
|
1410 |
|
# http://code.google.com/p/ganeti/issues/detail?id=182); we only
|
1411 |
|
# care about the first 128MB of data in the device, even though it
|
1412 |
|
# can be bigger
|
1413 |
|
result = utils.RunCmd([constants.DD_CMD,
|
1414 |
|
"if=/dev/zero", "of=%s" % dev_path,
|
1415 |
|
"bs=1048576", "count=128", "oflag=direct"])
|
1416 |
|
if result.failed:
|
1417 |
|
_ThrowError("Can't wipe the meta device: %s", result.output)
|
1418 |
|
|
1419 |
|
result = utils.RunCmd(["drbdmeta", "--force", cls._DevPath(minor),
|
1420 |
|
"v08", dev_path, "0", "create-md"])
|
1421 |
|
if result.failed:
|
1422 |
|
_ThrowError("Can't initialize meta device: %s", result.output)
|
1423 |
|
|
1424 |
|
@classmethod
|
1425 |
|
def _FindUnusedMinor(cls):
|
1426 |
|
"""Find an unused DRBD device.
|
1427 |
|
|
1428 |
|
This is specific to 8.x as the minors are allocated dynamically,
|
1429 |
|
so non-existing numbers up to a max minor count are actually free.
|
1430 |
|
|
1431 |
|
"""
|
1432 |
|
data = cls._GetProcData()
|
1433 |
|
|
1434 |
|
highest = None
|
1435 |
|
for line in data:
|
1436 |
|
match = cls._UNUSED_LINE_RE.match(line)
|
1437 |
|
if match:
|
1438 |
|
return int(match.group(1))
|
1439 |
|
match = cls._VALID_LINE_RE.match(line)
|
1440 |
|
if match:
|
1441 |
|
minor = int(match.group(1))
|
1442 |
|
highest = max(highest, minor)
|
1443 |
|
if highest is None: # there are no minors in use at all
|
1444 |
|
return 0
|
1445 |
|
if highest >= cls._MAX_MINORS:
|
1446 |
|
logging.error("Error: no free drbd minors!")
|
1447 |
|
raise errors.BlockDeviceError("Can't find a free DRBD minor")
|
1448 |
|
return highest + 1
|
1449 |
709 |
|
1450 |
|
@classmethod
|
1451 |
|
def _GetShowParser(cls):
|
1452 |
|
"""Return a parser for `drbd show` output.
|
1453 |
|
|
1454 |
|
This will either create or return an already-created parser for the
|
1455 |
|
output of the command `drbd show`.
|
1456 |
|
|
1457 |
|
"""
|
1458 |
|
if cls._PARSE_SHOW is not None:
|
1459 |
|
return cls._PARSE_SHOW
|
1460 |
|
|
1461 |
|
# pyparsing setup
|
1462 |
|
lbrace = pyp.Literal("{").suppress()
|
1463 |
|
rbrace = pyp.Literal("}").suppress()
|
1464 |
|
lbracket = pyp.Literal("[").suppress()
|
1465 |
|
rbracket = pyp.Literal("]").suppress()
|
1466 |
|
semi = pyp.Literal(";").suppress()
|
1467 |
|
colon = pyp.Literal(":").suppress()
|
1468 |
|
# this also converts the value to an int
|
1469 |
|
number = pyp.Word(pyp.nums).setParseAction(lambda s, l, t: int(t[0]))
|
1470 |
|
|
1471 |
|
comment = pyp.Literal("#") + pyp.Optional(pyp.restOfLine)
|
1472 |
|
defa = pyp.Literal("_is_default").suppress()
|
1473 |
|
dbl_quote = pyp.Literal('"').suppress()
|
1474 |
|
|
1475 |
|
keyword = pyp.Word(pyp.alphanums + "-")
|
1476 |
|
|
1477 |
|
# value types
|
1478 |
|
value = pyp.Word(pyp.alphanums + "_-/.:")
|
1479 |
|
quoted = dbl_quote + pyp.CharsNotIn('"') + dbl_quote
|
1480 |
|
ipv4_addr = (pyp.Optional(pyp.Literal("ipv4")).suppress() +
|
1481 |
|
pyp.Word(pyp.nums + ".") + colon + number)
|
1482 |
|
ipv6_addr = (pyp.Optional(pyp.Literal("ipv6")).suppress() +
|
1483 |
|
pyp.Optional(lbracket) + pyp.Word(pyp.hexnums + ":") +
|
1484 |
|
pyp.Optional(rbracket) + colon + number)
|
1485 |
|
# meta device, extended syntax
|
1486 |
|
meta_value = ((value ^ quoted) + lbracket + number + rbracket)
|
1487 |
|
# device name, extended syntax
|
1488 |
|
device_value = pyp.Literal("minor").suppress() + number
|
1489 |
|
|
1490 |
|
# a statement
|
1491 |
|
stmt = (~rbrace + keyword + ~lbrace +
|
1492 |
|
pyp.Optional(ipv4_addr ^ ipv6_addr ^ value ^ quoted ^ meta_value ^
|
1493 |
|
device_value) +
|
1494 |
|
pyp.Optional(defa) + semi +
|
1495 |
|
pyp.Optional(pyp.restOfLine).suppress())
|
1496 |
|
|
1497 |
|
# an entire section
|
1498 |
|
section_name = pyp.Word(pyp.alphas + "_")
|
1499 |
|
section = section_name + lbrace + pyp.ZeroOrMore(pyp.Group(stmt)) + rbrace
|
1500 |
|
|
1501 |
|
bnf = pyp.ZeroOrMore(pyp.Group(section ^ stmt))
|
1502 |
|
bnf.ignore(comment)
|
1503 |
|
|
1504 |
|
cls._PARSE_SHOW = bnf
|
1505 |
|
|
1506 |
|
return bnf
|
1507 |
|
|
1508 |
|
@classmethod
|
1509 |
|
def _GetShowData(cls, minor):
|
1510 |
|
"""Return the `drbdsetup show` data for a minor.
|
1511 |
|
|
1512 |
|
"""
|
1513 |
|
result = utils.RunCmd(["drbdsetup", cls._DevPath(minor), "show"])
|
1514 |
|
if result.failed:
|
1515 |
|
logging.error("Can't display the drbd config: %s - %s",
|
1516 |
|
result.fail_reason, result.output)
|
1517 |
|
return None
|
1518 |
|
return result.stdout
|
1519 |
|
|
1520 |
|
@classmethod
|
1521 |
|
def _GetDevInfo(cls, out):
|
1522 |
|
"""Parse details about a given DRBD minor.
|
1523 |
|
|
1524 |
|
This return, if available, the local backing device (as a path)
|
1525 |
|
and the local and remote (ip, port) information from a string
|
1526 |
|
containing the output of the `drbdsetup show` command as returned
|
1527 |
|
by _GetShowData.
|
1528 |
|
|
1529 |
|
"""
|
1530 |
|
data = {}
|
1531 |
|
if not out:
|
1532 |
|
return data
|
1533 |
|
|
1534 |
|
bnf = cls._GetShowParser()
|
1535 |
|
# run pyparse
|
1536 |
|
|
1537 |
|
try:
|
1538 |
|
results = bnf.parseString(out)
|
1539 |
|
except pyp.ParseException, err:
|
1540 |
|
_ThrowError("Can't parse drbdsetup show output: %s", str(err))
|
1541 |
|
|
1542 |
|
# and massage the results into our desired format
|
1543 |
|
for section in results:
|
1544 |
|
sname = section[0]
|
1545 |
|
if sname == "_this_host":
|
1546 |
|
for lst in section[1:]:
|
1547 |
|
if lst[0] == "disk":
|
1548 |
|
data["local_dev"] = lst[1]
|
1549 |
|
elif lst[0] == "meta-disk":
|
1550 |
|
data["meta_dev"] = lst[1]
|
1551 |
|
data["meta_index"] = lst[2]
|
1552 |
|
elif lst[0] == "address":
|
1553 |
|
data["local_addr"] = tuple(lst[1:])
|
1554 |
|
elif sname == "_remote_host":
|
1555 |
|
for lst in section[1:]:
|
1556 |
|
if lst[0] == "address":
|
1557 |
|
data["remote_addr"] = tuple(lst[1:])
|
1558 |
|
return data
|
1559 |
|
|
1560 |
|
def _MatchesLocal(self, info):
|
1561 |
|
"""Test if our local config matches with an existing device.
|
1562 |
|
|
1563 |
|
The parameter should be as returned from `_GetDevInfo()`. This
|
1564 |
|
method tests if our local backing device is the same as the one in
|
1565 |
|
the info parameter, in effect testing if we look like the given
|
1566 |
|
device.
|
1567 |
|
|
1568 |
|
"""
|
1569 |
|
if self._children:
|
1570 |
|
backend, meta = self._children
|
1571 |
|
else:
|
1572 |
|
backend = meta = None
|
1573 |
|
|
1574 |
|
if backend is not None:
|
1575 |
|
retval = ("local_dev" in info and info["local_dev"] == backend.dev_path)
|
1576 |
|
else:
|
1577 |
|
retval = ("local_dev" not in info)
|
1578 |
|
|
1579 |
|
if meta is not None:
|
1580 |
|
retval = retval and ("meta_dev" in info and
|