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#
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# Copyright (C) 2006, 2007 Google Inc.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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# 02110-1301, USA.
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"""Block device abstraction"""
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import re |
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import time |
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import errno |
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import pyparsing as pyp |
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import os |
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import logging |
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from ganeti import utils |
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from ganeti import errors |
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from ganeti import constants |
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def _IgnoreError(fn, *args, **kwargs): |
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"""Executes the given function, ignoring BlockDeviceErrors.
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This is used in order to simplify the execution of cleanup or
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rollback functions.
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@rtype: boolean
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@return: True when fn didn't raise an exception, False otherwise
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"""
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try:
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fn(*args, **kwargs) |
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return True |
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except errors.BlockDeviceError, err:
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logging.warning("Caught BlockDeviceError but ignoring: %s" % str(err)) |
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return False |
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def _ThrowError(msg, *args): |
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"""Log an error to the node daemon and the raise an exception.
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@type msg: string
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@param msg: the text of the exception
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@raise errors.BlockDeviceError
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"""
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if args:
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msg = msg % args |
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logging.error(msg) |
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raise errors.BlockDeviceError(msg)
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class BlockDev(object): |
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"""Block device abstract class.
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A block device can be in the following states:
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- not existing on the system, and by `Create()` it goes into:
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- existing but not setup/not active, and by `Assemble()` goes into:
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- active read-write and by `Open()` it goes into
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- online (=used, or ready for use)
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A device can also be online but read-only, however we are not using
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the readonly state (LV has it, if needed in the future) and we are
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usually looking at this like at a stack, so it's easier to
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conceptualise the transition from not-existing to online and back
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like a linear one.
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The many different states of the device are due to the fact that we
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need to cover many device types:
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- logical volumes are created, lvchange -a y $lv, and used
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- drbd devices are attached to a local disk/remote peer and made primary
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A block device is identified by three items:
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- the /dev path of the device (dynamic)
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- a unique ID of the device (static)
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- it's major/minor pair (dynamic)
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Not all devices implement both the first two as distinct items. LVM
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logical volumes have their unique ID (the pair volume group, logical
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volume name) in a 1-to-1 relation to the dev path. For DRBD devices,
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the /dev path is again dynamic and the unique id is the pair (host1,
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dev1), (host2, dev2).
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You can get to a device in two ways:
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- creating the (real) device, which returns you
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an attached instance (lvcreate)
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- attaching of a python instance to an existing (real) device
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The second point, the attachement to a device, is different
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depending on whether the device is assembled or not. At init() time,
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we search for a device with the same unique_id as us. If found,
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good. It also means that the device is already assembled. If not,
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after assembly we'll have our correct major/minor.
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"""
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def __init__(self, unique_id, children): |
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self._children = children
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self.dev_path = None |
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self.unique_id = unique_id
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self.major = None |
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self.minor = None |
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self.attached = False |
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def Assemble(self): |
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"""Assemble the device from its components.
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Implementations of this method by child classes must ensure that:
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- after the device has been assembled, it knows its major/minor
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numbers; this allows other devices (usually parents) to probe
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correctly for their children
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- calling this method on an existing, in-use device is safe
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- if the device is already configured (and in an OK state),
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this method is idempotent
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"""
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pass
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def Attach(self): |
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"""Find a device which matches our config and attach to it.
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"""
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raise NotImplementedError |
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def Close(self): |
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"""Notifies that the device will no longer be used for I/O.
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"""
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raise NotImplementedError |
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@classmethod
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def Create(cls, unique_id, children, size): |
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"""Create the device.
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If the device cannot be created, it will return None
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instead. Error messages go to the logging system.
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Note that for some devices, the unique_id is used, and for other,
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the children. The idea is that these two, taken together, are
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enough for both creation and assembly (later).
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"""
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raise NotImplementedError |
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def Remove(self): |
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"""Remove this device.
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This makes sense only for some of the device types: LV and file
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storeage. Also note that if the device can't attach, the removal
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can't be completed.
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"""
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raise NotImplementedError |
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def Rename(self, new_id): |
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"""Rename this device.
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This may or may not make sense for a given device type.
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"""
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raise NotImplementedError |
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def Open(self, force=False): |
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"""Make the device ready for use.
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This makes the device ready for I/O. For now, just the DRBD
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devices need this.
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The force parameter signifies that if the device has any kind of
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--force thing, it should be used, we know what we are doing.
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"""
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raise NotImplementedError |
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def Shutdown(self): |
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"""Shut down the device, freeing its children.
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This undoes the `Assemble()` work, except for the child
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assembling; as such, the children on the device are still
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assembled after this call.
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"""
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raise NotImplementedError |
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def SetSyncSpeed(self, speed): |
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"""Adjust the sync speed of the mirror.
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In case this is not a mirroring device, this is no-op.
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"""
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result = True
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if self._children: |
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for child in self._children: |
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result = result and child.SetSyncSpeed(speed)
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return result
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def GetSyncStatus(self): |
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"""Returns the sync status of the device.
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If this device is a mirroring device, this function returns the
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status of the mirror.
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If sync_percent is None, it means the device is not syncing.
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If estimated_time is None, it means we can't estimate
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the time needed, otherwise it's the time left in seconds.
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If is_degraded is True, it means the device is missing
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redundancy. This is usually a sign that something went wrong in
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the device setup, if sync_percent is None.
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The ldisk parameter represents the degradation of the local
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data. This is only valid for some devices, the rest will always
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return False (not degraded).
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@rtype: tuple
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@return: (sync_percent, estimated_time, is_degraded, ldisk)
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"""
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return None, None, False, False |
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def CombinedSyncStatus(self): |
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"""Calculate the mirror status recursively for our children.
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The return value is the same as for `GetSyncStatus()` except the
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minimum percent and maximum time are calculated across our
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children.
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"""
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min_percent, max_time, is_degraded, ldisk = self.GetSyncStatus()
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if self._children: |
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for child in self._children: |
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c_percent, c_time, c_degraded, c_ldisk = child.GetSyncStatus() |
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if min_percent is None: |
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min_percent = c_percent |
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elif c_percent is not None: |
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min_percent = min(min_percent, c_percent)
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if max_time is None: |
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max_time = c_time |
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elif c_time is not None: |
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max_time = max(max_time, c_time)
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is_degraded = is_degraded or c_degraded
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ldisk = ldisk or c_ldisk
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return min_percent, max_time, is_degraded, ldisk
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def SetInfo(self, text): |
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"""Update metadata with info text.
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Only supported for some device types.
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"""
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for child in self._children: |
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child.SetInfo(text) |
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def Grow(self, amount): |
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"""Grow the block device.
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@param amount: the amount (in mebibytes) to grow with
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"""
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raise NotImplementedError |
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def __repr__(self): |
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return ("<%s: unique_id: %s, children: %s, %s:%s, %s>" % |
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(self.__class__, self.unique_id, self._children, |
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self.major, self.minor, self.dev_path)) |
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class LogicalVolume(BlockDev): |
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"""Logical Volume block device.
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"""
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def __init__(self, unique_id, children): |
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"""Attaches to a LV device.
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The unique_id is a tuple (vg_name, lv_name)
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"""
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super(LogicalVolume, self).__init__(unique_id, children) |
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if not isinstance(unique_id, (tuple, list)) or len(unique_id) != 2: |
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raise ValueError("Invalid configuration data %s" % str(unique_id)) |
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self._vg_name, self._lv_name = unique_id |
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self.dev_path = "/dev/%s/%s" % (self._vg_name, self._lv_name) |
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self._degraded = True |
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self.major = self.minor = None |
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self.Attach()
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@classmethod
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def Create(cls, unique_id, children, size): |
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"""Create a new logical volume.
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"""
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if not isinstance(unique_id, (tuple, list)) or len(unique_id) != 2: |
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raise errors.ProgrammerError("Invalid configuration data %s" % |
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str(unique_id))
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vg_name, lv_name = unique_id |
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pvs_info = cls.GetPVInfo(vg_name) |
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if not pvs_info: |
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_ThrowError("Can't compute PV info for vg %s", vg_name)
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pvs_info.sort() |
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pvs_info.reverse() |
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pvlist = [ pv[1] for pv in pvs_info ] |
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free_size = sum([ pv[0] for pv in pvs_info ]) |
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# The size constraint should have been checked from the master before
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# calling the create function.
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if free_size < size:
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_ThrowError("Not enough free space: required %s,"
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" available %s", size, free_size)
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result = utils.RunCmd(["lvcreate", "-L%dm" % size, "-n%s" % lv_name, |
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vg_name] + pvlist) |
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if result.failed:
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_ThrowError("LV create failed (%s): %s",
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result.fail_reason, result.output) |
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return LogicalVolume(unique_id, children)
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@staticmethod
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def GetPVInfo(vg_name): |
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"""Get the free space info for PVs in a volume group.
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@param vg_name: the volume group name
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@rtype: list
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@return: list of tuples (free_space, name) with free_space in mebibytes
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"""
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command = ["pvs", "--noheadings", "--nosuffix", "--units=m", |
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"-opv_name,vg_name,pv_free,pv_attr", "--unbuffered", |
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"--separator=:"]
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result = utils.RunCmd(command) |
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if result.failed:
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logging.error("Can't get the PV information: %s - %s",
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result.fail_reason, result.output) |
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return None |
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data = [] |
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for line in result.stdout.splitlines(): |
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fields = line.strip().split(':')
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if len(fields) != 4: |
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logging.error("Can't parse pvs output: line '%s'", line)
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return None |
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# skip over pvs from another vg or ones which are not allocatable
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if fields[1] != vg_name or fields[3][0] != 'a': |
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continue
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data.append((float(fields[2]), fields[0])) |
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return data
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def Remove(self): |
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"""Remove this logical volume.
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"""
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if not self.minor and not self.Attach(): |
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# the LV does not exist
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return
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result = utils.RunCmd(["lvremove", "-f", "%s/%s" % |
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(self._vg_name, self._lv_name)]) |
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if result.failed:
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_ThrowError("Can't lvremove: %s - %s", result.fail_reason, result.output)
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def Rename(self, new_id): |
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"""Rename this logical volume.
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"""
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if not isinstance(new_id, (tuple, list)) or len(new_id) != 2: |
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raise errors.ProgrammerError("Invalid new logical id '%s'" % new_id) |
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new_vg, new_name = new_id |
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if new_vg != self._vg_name: |
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raise errors.ProgrammerError("Can't move a logical volume across" |
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" volume groups (from %s to to %s)" %
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(self._vg_name, new_vg))
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result = utils.RunCmd(["lvrename", new_vg, self._lv_name, new_name]) |
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if result.failed:
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_ThrowError("Failed to rename the logical volume: %s", result.output)
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self._lv_name = new_name
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self.dev_path = "/dev/%s/%s" % (self._vg_name, self._lv_name) |
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def Attach(self): |
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"""Attach to an existing LV.
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This method will try to see if an existing and active LV exists
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which matches our name. If so, its major/minor will be
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recorded.
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"""
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self.attached = False |
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result = utils.RunCmd(["lvs", "--noheadings", "--separator=,", |
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"-olv_attr,lv_kernel_major,lv_kernel_minor",
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self.dev_path])
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if result.failed:
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logging.error("Can't find LV %s: %s, %s",
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self.dev_path, result.fail_reason, result.output)
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return False |
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out = result.stdout.strip().rstrip(',')
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out = out.split(",")
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if len(out) != 3: |
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logging.error("Can't parse LVS output, len(%s) != 3", str(out)) |
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return False |
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status, major, minor = out[:3]
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if len(status) != 6: |
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logging.error("lvs lv_attr is not 6 characters (%s)", status)
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return False |
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try:
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major = int(major)
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minor = int(minor)
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except ValueError, err: |
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logging.error("lvs major/minor cannot be parsed: %s", str(err)) |
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self.major = major
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self.minor = minor
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self._degraded = status[0] == 'v' # virtual volume, i.e. doesn't backing |
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# storage
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self.attached = True |
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return True |
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def Assemble(self): |
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"""Assemble the device.
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We alway run `lvchange -ay` on the LV to ensure it's active before
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use, as there were cases when xenvg was not active after boot
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(also possibly after disk issues).
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"""
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result = utils.RunCmd(["lvchange", "-ay", self.dev_path]) |
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if result.failed:
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_ThrowError("Can't activate lv %s: %s", self.dev_path, result.output) |
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def Shutdown(self): |
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"""Shutdown the device.
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This is a no-op for the LV device type, as we don't deactivate the
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volumes on shutdown.
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"""
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pass
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def GetSyncStatus(self): |
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"""Returns the sync status of the device.
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If this device is a mirroring device, this function returns the
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status of the mirror.
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For logical volumes, sync_percent and estimated_time are always
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None (no recovery in progress, as we don't handle the mirrored LV
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case). The is_degraded parameter is the inverse of the ldisk
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parameter.
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For the ldisk parameter, we check if the logical volume has the
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'virtual' type, which means it's not backed by existing storage
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anymore (read from it return I/O error). This happens after a
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physical disk failure and subsequent 'vgreduce --removemissing' on
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the volume group.
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The status was already read in Attach, so we just return it.
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@rtype: tuple
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@return: (sync_percent, estimated_time, is_degraded, ldisk)
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"""
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return None, None, self._degraded, self._degraded |
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def Open(self, force=False): |
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"""Make the device ready for I/O.
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This is a no-op for the LV device type.
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"""
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pass
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def Close(self): |
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"""Notifies that the device will no longer be used for I/O.
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This is a no-op for the LV device type.
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"""
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pass
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def Snapshot(self, size): |
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"""Create a snapshot copy of an lvm block device.
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"""
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snap_name = self._lv_name + ".snap" |
501 |
|
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# remove existing snapshot if found
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snap = LogicalVolume((self._vg_name, snap_name), None) |
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_IgnoreError(snap.Remove) |
505 |
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pvs_info = self.GetPVInfo(self._vg_name) |
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if not pvs_info: |
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_ThrowError("Can't compute PV info for vg %s", self._vg_name) |
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pvs_info.sort() |
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pvs_info.reverse() |
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free_size, pv_name = pvs_info[0]
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if free_size < size:
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_ThrowError("Not enough free space: required %s,"
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" available %s", size, free_size)
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|
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result = utils.RunCmd(["lvcreate", "-L%dm" % size, "-s", |
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"-n%s" % snap_name, self.dev_path]) |
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if result.failed:
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_ThrowError("command: %s error: %s - %s",
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result.cmd, result.fail_reason, result.output) |
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return snap_name
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|
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def SetInfo(self, text): |
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"""Update metadata with info text.
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526 |
|
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"""
|
528 |
BlockDev.SetInfo(self, text)
|
529 |
|
530 |
# Replace invalid characters
|
531 |
text = re.sub('^[^A-Za-z0-9_+.]', '_', text) |
532 |
text = re.sub('[^-A-Za-z0-9_+.]', '_', text) |
533 |
|
534 |
# Only up to 128 characters are allowed
|
535 |
text = text[:128]
|
536 |
|
537 |
result = utils.RunCmd(["lvchange", "--addtag", text, |
538 |
self.dev_path])
|
539 |
if result.failed:
|
540 |
_ThrowError("Command: %s error: %s - %s", result.cmd, result.fail_reason,
|
541 |
result.output) |
542 |
|
543 |
def Grow(self, amount): |
544 |
"""Grow the logical volume.
|
545 |
|
546 |
"""
|
547 |
# we try multiple algorithms since the 'best' ones might not have
|
548 |
# space available in the right place, but later ones might (since
|
549 |
# they have less constraints); also note that only recent LVM
|
550 |
# supports 'cling'
|
551 |
for alloc_policy in "contiguous", "cling", "normal": |
552 |
result = utils.RunCmd(["lvextend", "--alloc", alloc_policy, |
553 |
"-L", "+%dm" % amount, self.dev_path]) |
554 |
if not result.failed: |
555 |
return
|
556 |
_ThrowError("Can't grow LV %s: %s", self.dev_path, result.output) |
557 |
|
558 |
|
559 |
class DRBD8Status(object): |
560 |
"""A DRBD status representation class.
|
561 |
|
562 |
Note that this doesn't support unconfigured devices (cs:Unconfigured).
|
563 |
|
564 |
"""
|
565 |
UNCONF_RE = re.compile(r"\s*[0-9]+:\s*cs:Unconfigured$")
|
566 |
LINE_RE = re.compile(r"\s*[0-9]+:\s*cs:(\S+)\s+st:([^/]+)/(\S+)"
|
567 |
"\s+ds:([^/]+)/(\S+)\s+.*$")
|
568 |
SYNC_RE = re.compile(r"^.*\ssync'ed:\s*([0-9.]+)%.*"
|
569 |
"\sfinish: ([0-9]+):([0-9]+):([0-9]+)\s.*$")
|
570 |
|
571 |
def __init__(self, procline): |
572 |
u = self.UNCONF_RE.match(procline)
|
573 |
if u:
|
574 |
self.cstatus = "Unconfigured" |
575 |
self.lrole = self.rrole = self.ldisk = self.rdisk = None |
576 |
else:
|
577 |
m = self.LINE_RE.match(procline)
|
578 |
if not m: |
579 |
raise errors.BlockDeviceError("Can't parse input data '%s'" % procline) |
580 |
self.cstatus = m.group(1) |
581 |
self.lrole = m.group(2) |
582 |
self.rrole = m.group(3) |
583 |
self.ldisk = m.group(4) |
584 |
self.rdisk = m.group(5) |
585 |
|
586 |
# end reading of data from the LINE_RE or UNCONF_RE
|
587 |
|
588 |
self.is_standalone = self.cstatus == "StandAlone" |
589 |
self.is_wfconn = self.cstatus == "WFConnection" |
590 |
self.is_connected = self.cstatus == "Connected" |
591 |
self.is_primary = self.lrole == "Primary" |
592 |
self.is_secondary = self.lrole == "Secondary" |
593 |
self.peer_primary = self.rrole == "Primary" |
594 |
self.peer_secondary = self.rrole == "Secondary" |
595 |
self.both_primary = self.is_primary and self.peer_primary |
596 |
self.both_secondary = self.is_secondary and self.peer_secondary |
597 |
|
598 |
self.is_diskless = self.ldisk == "Diskless" |
599 |
self.is_disk_uptodate = self.ldisk == "UpToDate" |
600 |
|
601 |
self.is_in_resync = self.cstatus in ("SyncSource", "SyncTarget") |
602 |
self.is_in_use = self.cstatus != "Unconfigured" |
603 |
|
604 |
m = self.SYNC_RE.match(procline)
|
605 |
if m:
|
606 |
self.sync_percent = float(m.group(1)) |
607 |
hours = int(m.group(2)) |
608 |
minutes = int(m.group(3)) |
609 |
seconds = int(m.group(4)) |
610 |
self.est_time = hours * 3600 + minutes * 60 + seconds |
611 |
else:
|
612 |
self.sync_percent = None |
613 |
self.est_time = None |
614 |
|
615 |
self.is_sync_target = self.peer_sync_source = self.cstatus == "SyncTarget" |
616 |
self.peer_sync_target = self.is_sync_source = self.cstatus == "SyncSource" |
617 |
self.is_resync = self.is_sync_target or self.is_sync_source |
618 |
|
619 |
|
620 |
class BaseDRBD(BlockDev): |
621 |
"""Base DRBD class.
|
622 |
|
623 |
This class contains a few bits of common functionality between the
|
624 |
0.7 and 8.x versions of DRBD.
|
625 |
|
626 |
"""
|
627 |
_VERSION_RE = re.compile(r"^version: (\d+)\.(\d+)\.(\d+)"
|
628 |
r" \(api:(\d+)/proto:(\d+)(?:-(\d+))?\)")
|
629 |
|
630 |
_DRBD_MAJOR = 147
|
631 |
_ST_UNCONFIGURED = "Unconfigured"
|
632 |
_ST_WFCONNECTION = "WFConnection"
|
633 |
_ST_CONNECTED = "Connected"
|
634 |
|
635 |
_STATUS_FILE = "/proc/drbd"
|
636 |
|
637 |
@staticmethod
|
638 |
def _GetProcData(filename=_STATUS_FILE): |
639 |
"""Return data from /proc/drbd.
|
640 |
|
641 |
"""
|
642 |
stat = open(filename, "r") |
643 |
try:
|
644 |
data = stat.read().splitlines() |
645 |
finally:
|
646 |
stat.close() |
647 |
if not data: |
648 |
_ThrowError("Can't read any data from %s", filename)
|
649 |
return data
|
650 |
|
651 |
@staticmethod
|
652 |
def _MassageProcData(data): |
653 |
"""Transform the output of _GetProdData into a nicer form.
|
654 |
|
655 |
@return: a dictionary of minor: joined lines from /proc/drbd
|
656 |
for that minor
|
657 |
|
658 |
"""
|
659 |
lmatch = re.compile("^ *([0-9]+):.*$")
|
660 |
results = {} |
661 |
old_minor = old_line = None
|
662 |
for line in data: |
663 |
lresult = lmatch.match(line) |
664 |
if lresult is not None: |
665 |
if old_minor is not None: |
666 |
results[old_minor] = old_line |
667 |
old_minor = int(lresult.group(1)) |
668 |
old_line = line |
669 |
else:
|
670 |
if old_minor is not None: |
671 |
old_line += " " + line.strip()
|
672 |
# add last line
|
673 |
if old_minor is not None: |
674 |
results[old_minor] = old_line |
675 |
return results
|
676 |
|
677 |
@classmethod
|
678 |
def _GetVersion(cls): |
679 |
"""Return the DRBD version.
|
680 |
|
681 |
This will return a dict with keys:
|
682 |
- k_major
|
683 |
- k_minor
|
684 |
- k_point
|
685 |
- api
|
686 |
- proto
|
687 |
- proto2 (only on drbd > 8.2.X)
|
688 |
|
689 |
"""
|
690 |
proc_data = cls._GetProcData() |
691 |
first_line = proc_data[0].strip()
|
692 |
version = cls._VERSION_RE.match(first_line) |
693 |
if not version: |
694 |
raise errors.BlockDeviceError("Can't parse DRBD version from '%s'" % |
695 |
first_line) |
696 |
|
697 |
values = version.groups() |
698 |
retval = {'k_major': int(values[0]), |
699 |
'k_minor': int(values[1]), |
700 |
'k_point': int(values[2]), |
701 |
'api': int(values[3]), |
702 |
'proto': int(values[4]), |
703 |
} |
704 |
if values[5] is not None: |
705 |
retval['proto2'] = values[5] |
706 |
|
707 |
return retval
|
708 |
|
709 |
@staticmethod
|
710 |
def _DevPath(minor): |
711 |
"""Return the path to a drbd device for a given minor.
|
712 |
|
713 |
"""
|
714 |
return "/dev/drbd%d" % minor |
715 |
|
716 |
@classmethod
|
717 |
def GetUsedDevs(cls): |
718 |
"""Compute the list of used DRBD devices.
|
719 |
|
720 |
"""
|
721 |
data = cls._GetProcData() |
722 |
|
723 |
used_devs = {} |
724 |
valid_line = re.compile("^ *([0-9]+): cs:([^ ]+).*$")
|
725 |
for line in data: |
726 |
match = valid_line.match(line) |
727 |
if not match: |
728 |
continue
|
729 |
minor = int(match.group(1)) |
730 |
state = match.group(2)
|
731 |
if state == cls._ST_UNCONFIGURED:
|
732 |
continue
|
733 |
used_devs[minor] = state, line |
734 |
|
735 |
return used_devs
|
736 |
|
737 |
def _SetFromMinor(self, minor): |
738 |
"""Set our parameters based on the given minor.
|
739 |
|
740 |
This sets our minor variable and our dev_path.
|
741 |
|
742 |
"""
|
743 |
if minor is None: |
744 |
self.minor = self.dev_path = None |
745 |
self.attached = False |
746 |
else:
|
747 |
self.minor = minor
|
748 |
self.dev_path = self._DevPath(minor) |
749 |
self.attached = True |
750 |
|
751 |
@staticmethod
|
752 |
def _CheckMetaSize(meta_device): |
753 |
"""Check if the given meta device looks like a valid one.
|
754 |
|
755 |
This currently only check the size, which must be around
|
756 |
128MiB.
|
757 |
|
758 |
"""
|
759 |
result = utils.RunCmd(["blockdev", "--getsize", meta_device]) |
760 |
if result.failed:
|
761 |
_ThrowError("Failed to get device size: %s - %s",
|
762 |
result.fail_reason, result.output) |
763 |
try:
|
764 |
sectors = int(result.stdout)
|
765 |
except ValueError: |
766 |
_ThrowError("Invalid output from blockdev: '%s'", result.stdout)
|
767 |
bytes = sectors * 512
|
768 |
if bytes < 128 * 1024 * 1024: # less than 128MiB |
769 |
_ThrowError("Meta device too small (%.2fMib)", (bytes / 1024 / 1024)) |
770 |
if bytes > (128 + 32) * 1024 * 1024: # account for an extra (big) PE on LVM |
771 |
_ThrowError("Meta device too big (%.2fMiB)", (bytes / 1024 / 1024)) |
772 |
|
773 |
def Rename(self, new_id): |
774 |
"""Rename a device.
|
775 |
|
776 |
This is not supported for drbd devices.
|
777 |
|
778 |
"""
|
779 |
raise errors.ProgrammerError("Can't rename a drbd device") |
780 |
|
781 |
|
782 |
class DRBD8(BaseDRBD): |
783 |
"""DRBD v8.x block device.
|
784 |
|
785 |
This implements the local host part of the DRBD device, i.e. it
|
786 |
doesn't do anything to the supposed peer. If you need a fully
|
787 |
connected DRBD pair, you need to use this class on both hosts.
|
788 |
|
789 |
The unique_id for the drbd device is the (local_ip, local_port,
|
790 |
remote_ip, remote_port) tuple, and it must have two children: the
|
791 |
data device and the meta_device. The meta device is checked for
|
792 |
valid size and is zeroed on create.
|
793 |
|
794 |
"""
|
795 |
_MAX_MINORS = 255
|
796 |
_PARSE_SHOW = None
|
797 |
|
798 |
# timeout constants
|
799 |
_NET_RECONFIG_TIMEOUT = 60
|
800 |
|
801 |
def __init__(self, unique_id, children): |
802 |
if children and children.count(None) > 0: |
803 |
children = [] |
804 |
super(DRBD8, self).__init__(unique_id, children) |
805 |
self.major = self._DRBD_MAJOR |
806 |
version = self._GetVersion()
|
807 |
if version['k_major'] != 8 : |
808 |
_ThrowError("Mismatch in DRBD kernel version and requested ganeti"
|
809 |
" usage: kernel is %s.%s, ganeti wants 8.x",
|
810 |
version['k_major'], version['k_minor']) |
811 |
|
812 |
if len(children) not in (0, 2): |
813 |
raise ValueError("Invalid configuration data %s" % str(children)) |
814 |
if not isinstance(unique_id, (tuple, list)) or len(unique_id) != 6: |
815 |
raise ValueError("Invalid configuration data %s" % str(unique_id)) |
816 |
(self._lhost, self._lport, |
817 |
self._rhost, self._rport, |
818 |
self._aminor, self._secret) = unique_id |
819 |
if (self._lhost is not None and self._lhost == self._rhost and |
820 |
self._lport == self._rport): |
821 |
raise ValueError("Invalid configuration data, same local/remote %s" % |
822 |
(unique_id,)) |
823 |
self.Attach()
|
824 |
|
825 |
@classmethod
|
826 |
def _InitMeta(cls, minor, dev_path): |
827 |
"""Initialize a meta device.
|
828 |
|
829 |
This will not work if the given minor is in use.
|
830 |
|
831 |
"""
|
832 |
result = utils.RunCmd(["drbdmeta", "--force", cls._DevPath(minor), |
833 |
"v08", dev_path, "0", "create-md"]) |
834 |
if result.failed:
|
835 |
_ThrowError("Can't initialize meta device: %s", result.output)
|
836 |
|
837 |
@classmethod
|
838 |
def _FindUnusedMinor(cls): |
839 |
"""Find an unused DRBD device.
|
840 |
|
841 |
This is specific to 8.x as the minors are allocated dynamically,
|
842 |
so non-existing numbers up to a max minor count are actually free.
|
843 |
|
844 |
"""
|
845 |
data = cls._GetProcData() |
846 |
|
847 |
unused_line = re.compile("^ *([0-9]+): cs:Unconfigured$")
|
848 |
used_line = re.compile("^ *([0-9]+): cs:")
|
849 |
highest = None
|
850 |
for line in data: |
851 |
match = unused_line.match(line) |
852 |
if match:
|
853 |
return int(match.group(1)) |
854 |
match = used_line.match(line) |
855 |
if match:
|
856 |
minor = int(match.group(1)) |
857 |
highest = max(highest, minor)
|
858 |
if highest is None: # there are no minors in use at all |
859 |
return 0 |
860 |
if highest >= cls._MAX_MINORS:
|
861 |
logging.error("Error: no free drbd minors!")
|
862 |
raise errors.BlockDeviceError("Can't find a free DRBD minor") |
863 |
return highest + 1 |
864 |
|
865 |
@classmethod
|
866 |
def _GetShowParser(cls): |
867 |
"""Return a parser for `drbd show` output.
|
868 |
|
869 |
This will either create or return an already-create parser for the
|
870 |
output of the command `drbd show`.
|
871 |
|
872 |
"""
|
873 |
if cls._PARSE_SHOW is not None: |
874 |
return cls._PARSE_SHOW
|
875 |
|
876 |
# pyparsing setup
|
877 |
lbrace = pyp.Literal("{").suppress()
|
878 |
rbrace = pyp.Literal("}").suppress()
|
879 |
semi = pyp.Literal(";").suppress()
|
880 |
# this also converts the value to an int
|
881 |
number = pyp.Word(pyp.nums).setParseAction(lambda s, l, t: int(t[0])) |
882 |
|
883 |
comment = pyp.Literal ("#") + pyp.Optional(pyp.restOfLine)
|
884 |
defa = pyp.Literal("_is_default").suppress()
|
885 |
dbl_quote = pyp.Literal('"').suppress()
|
886 |
|
887 |
keyword = pyp.Word(pyp.alphanums + '-')
|
888 |
|
889 |
# value types
|
890 |
value = pyp.Word(pyp.alphanums + '_-/.:')
|
891 |
quoted = dbl_quote + pyp.CharsNotIn('"') + dbl_quote
|
892 |
addr_port = (pyp.Word(pyp.nums + '.') + pyp.Literal(':').suppress() + |
893 |
number) |
894 |
# meta device, extended syntax
|
895 |
meta_value = ((value ^ quoted) + pyp.Literal('[').suppress() +
|
896 |
number + pyp.Word(']').suppress())
|
897 |
|
898 |
# a statement
|
899 |
stmt = (~rbrace + keyword + ~lbrace + |
900 |
pyp.Optional(addr_port ^ value ^ quoted ^ meta_value) + |
901 |
pyp.Optional(defa) + semi + |
902 |
pyp.Optional(pyp.restOfLine).suppress()) |
903 |
|
904 |
# an entire section
|
905 |
section_name = pyp.Word(pyp.alphas + '_')
|
906 |
section = section_name + lbrace + pyp.ZeroOrMore(pyp.Group(stmt)) + rbrace |
907 |
|
908 |
bnf = pyp.ZeroOrMore(pyp.Group(section ^ stmt)) |
909 |
bnf.ignore(comment) |
910 |
|
911 |
cls._PARSE_SHOW = bnf |
912 |
|
913 |
return bnf
|
914 |
|
915 |
@classmethod
|
916 |
def _GetShowData(cls, minor): |
917 |
"""Return the `drbdsetup show` data for a minor.
|
918 |
|
919 |
"""
|
920 |
result = utils.RunCmd(["drbdsetup", cls._DevPath(minor), "show"]) |
921 |
if result.failed:
|
922 |
logging.error("Can't display the drbd config: %s - %s",
|
923 |
result.fail_reason, result.output) |
924 |
return None |
925 |
return result.stdout
|
926 |
|
927 |
@classmethod
|
928 |
def _GetDevInfo(cls, out): |
929 |
"""Parse details about a given DRBD minor.
|
930 |
|
931 |
This return, if available, the local backing device (as a path)
|
932 |
and the local and remote (ip, port) information from a string
|
933 |
containing the output of the `drbdsetup show` command as returned
|
934 |
by _GetShowData.
|
935 |
|
936 |
"""
|
937 |
data = {} |
938 |
if not out: |
939 |
return data
|
940 |
|
941 |
bnf = cls._GetShowParser() |
942 |
# run pyparse
|
943 |
|
944 |
try:
|
945 |
results = bnf.parseString(out) |
946 |
except pyp.ParseException, err:
|
947 |
_ThrowError("Can't parse drbdsetup show output: %s", str(err)) |
948 |
|
949 |
# and massage the results into our desired format
|
950 |
for section in results: |
951 |
sname = section[0]
|
952 |
if sname == "_this_host": |
953 |
for lst in section[1:]: |
954 |
if lst[0] == "disk": |
955 |
data["local_dev"] = lst[1] |
956 |
elif lst[0] == "meta-disk": |
957 |
data["meta_dev"] = lst[1] |
958 |
data["meta_index"] = lst[2] |
959 |
elif lst[0] == "address": |
960 |
data["local_addr"] = tuple(lst[1:]) |
961 |
elif sname == "_remote_host": |
962 |
for lst in section[1:]: |
963 |
if lst[0] == "address": |
964 |
data["remote_addr"] = tuple(lst[1:]) |
965 |
return data
|
966 |
|
967 |
def _MatchesLocal(self, info): |
968 |
"""Test if our local config matches with an existing device.
|
969 |
|
970 |
The parameter should be as returned from `_GetDevInfo()`. This
|
971 |
method tests if our local backing device is the same as the one in
|
972 |
the info parameter, in effect testing if we look like the given
|
973 |
device.
|
974 |
|
975 |
"""
|
976 |
if self._children: |
977 |
backend, meta = self._children
|
978 |
else:
|
979 |
backend = meta = None
|
980 |
|
981 |
if backend is not None: |
982 |
retval = ("local_dev" in info and info["local_dev"] == backend.dev_path) |
983 |
else:
|
984 |
retval = ("local_dev" not in info) |
985 |
|
986 |
if meta is not None: |
987 |
retval = retval and ("meta_dev" in info and |
988 |
info["meta_dev"] == meta.dev_path)
|
989 |
retval = retval and ("meta_index" in info and |
990 |
info["meta_index"] == 0) |
991 |
else:
|
992 |
retval = retval and ("meta_dev" not in info and |
993 |
"meta_index" not in info) |
994 |
return retval
|
995 |
|
996 |
def _MatchesNet(self, info): |
997 |
"""Test if our network config matches with an existing device.
|
998 |
|
999 |
The parameter should be as returned from `_GetDevInfo()`. This
|
1000 |
method tests if our network configuration is the same as the one
|
1001 |
in the info parameter, in effect testing if we look like the given
|
1002 |
device.
|
1003 |
|
1004 |
"""
|
1005 |
if (((self._lhost is None and not ("local_addr" in info)) and |
1006 |
(self._rhost is None and not ("remote_addr" in info)))): |
1007 |
return True |
1008 |
|
1009 |
if self._lhost is None: |
1010 |
return False |
1011 |
|
1012 |
if not ("local_addr" in info and |
1013 |
"remote_addr" in info): |
1014 |
return False |
1015 |
|
1016 |
retval = (info["local_addr"] == (self._lhost, self._lport)) |
1017 |
retval = (retval and
|
1018 |
info["remote_addr"] == (self._rhost, self._rport)) |
1019 |
return retval
|
1020 |
|
1021 |
@classmethod
|
1022 |
def _AssembleLocal(cls, minor, backend, meta): |
1023 |
"""Configure the local part of a DRBD device.
|
1024 |
|
1025 |
"""
|
1026 |
args = ["drbdsetup", cls._DevPath(minor), "disk", |
1027 |
backend, meta, "0", "-e", "detach", "--create-device"] |
1028 |
result = utils.RunCmd(args) |
1029 |
if result.failed:
|
1030 |
_ThrowError("drbd%d: can't attach local disk: %s", minor, result.output)
|
1031 |
|
1032 |
@classmethod
|
1033 |
def _AssembleNet(cls, minor, net_info, protocol, |
1034 |
dual_pri=False, hmac=None, secret=None): |
1035 |
"""Configure the network part of the device.
|
1036 |
|
1037 |
"""
|
1038 |
lhost, lport, rhost, rport = net_info |
1039 |
if None in net_info: |
1040 |
# we don't want network connection and actually want to make
|
1041 |
# sure its shutdown
|
1042 |
cls._ShutdownNet(minor) |
1043 |
return
|
1044 |
|
1045 |
# Workaround for a race condition. When DRBD is doing its dance to
|
1046 |
# establish a connection with its peer, it also sends the
|
1047 |
# synchronization speed over the wire. In some cases setting the
|
1048 |
# sync speed only after setting up both sides can race with DRBD
|
1049 |
# connecting, hence we set it here before telling DRBD anything
|
1050 |
# about its peer.
|
1051 |
cls._SetMinorSyncSpeed(minor, constants.SYNC_SPEED) |
1052 |
|
1053 |
args = ["drbdsetup", cls._DevPath(minor), "net", |
1054 |
"%s:%s" % (lhost, lport), "%s:%s" % (rhost, rport), protocol, |
1055 |
"-A", "discard-zero-changes", |
1056 |
"-B", "consensus", |
1057 |
"--create-device",
|
1058 |
] |
1059 |
if dual_pri:
|
1060 |
args.append("-m")
|
1061 |
if hmac and secret: |
1062 |
args.extend(["-a", hmac, "-x", secret]) |
1063 |
result = utils.RunCmd(args) |
1064 |
if result.failed:
|
1065 |
_ThrowError("drbd%d: can't setup network: %s - %s",
|
1066 |
minor, result.fail_reason, result.output) |
1067 |
|
1068 |
timeout = time.time() + 10
|
1069 |
ok = False
|
1070 |
while time.time() < timeout:
|
1071 |
info = cls._GetDevInfo(cls._GetShowData(minor)) |
1072 |
if not "local_addr" in info or not "remote_addr" in info: |
1073 |
time.sleep(1)
|
1074 |
continue
|
1075 |
if (info["local_addr"] != (lhost, lport) or |
1076 |
info["remote_addr"] != (rhost, rport)):
|
1077 |
time.sleep(1)
|
1078 |
continue
|
1079 |
ok = True
|
1080 |
break
|
1081 |
if not ok: |
1082 |
_ThrowError("drbd%d: timeout while configuring network", minor)
|
1083 |
|
1084 |
def AddChildren(self, devices): |
1085 |
"""Add a disk to the DRBD device.
|
1086 |
|
1087 |
"""
|
1088 |
if self.minor is None: |
1089 |
_ThrowError("drbd%d: can't attach to dbrd8 during AddChildren",
|
1090 |
self._aminor)
|
1091 |
if len(devices) != 2: |
1092 |
_ThrowError("drbd%d: need two devices for AddChildren", self.minor) |
1093 |
info = self._GetDevInfo(self._GetShowData(self.minor)) |
1094 |
if "local_dev" in info: |
1095 |
_ThrowError("drbd%d: already attached to a local disk", self.minor) |
1096 |
backend, meta = devices |
1097 |
if backend.dev_path is None or meta.dev_path is None: |
1098 |
_ThrowError("drbd%d: children not ready during AddChildren", self.minor) |
1099 |
backend.Open() |
1100 |
meta.Open() |
1101 |
self._CheckMetaSize(meta.dev_path)
|
1102 |
self._InitMeta(self._FindUnusedMinor(), meta.dev_path) |
1103 |
|
1104 |
self._AssembleLocal(self.minor, backend.dev_path, meta.dev_path) |
1105 |
self._children = devices
|
1106 |
|
1107 |
def RemoveChildren(self, devices): |
1108 |
"""Detach the drbd device from local storage.
|
1109 |
|
1110 |
"""
|
1111 |
if self.minor is None: |
1112 |
_ThrowError("drbd%d: can't attach to drbd8 during RemoveChildren",
|
1113 |
self._aminor)
|
1114 |
# early return if we don't actually have backing storage
|
1115 |
info = self._GetDevInfo(self._GetShowData(self.minor)) |
1116 |
if "local_dev" not in info: |
1117 |
return
|
1118 |
if len(self._children) != 2: |
1119 |
_ThrowError("drbd%d: we don't have two children: %s", self.minor, |
1120 |
self._children)
|
1121 |
if self._children.count(None) == 2: # we don't actually have children :) |
1122 |
logging.warning("drbd%d: requested detach while detached", self.minor) |
1123 |
return
|
1124 |
if len(devices) != 2: |
1125 |
_ThrowError("drbd%d: we need two children in RemoveChildren", self.minor) |
1126 |
for child, dev in zip(self._children, devices): |
1127 |
if dev != child.dev_path:
|
1128 |
_ThrowError("drbd%d: mismatch in local storage (%s != %s) in"
|
1129 |
" RemoveChildren", self.minor, dev, child.dev_path) |
1130 |
|
1131 |
self._ShutdownLocal(self.minor) |
1132 |
self._children = []
|
1133 |
|
1134 |
@classmethod
|
1135 |
def _SetMinorSyncSpeed(cls, minor, kbytes): |
1136 |
"""Set the speed of the DRBD syncer.
|
1137 |
|
1138 |
This is the low-level implementation.
|
1139 |
|
1140 |
@type minor: int
|
1141 |
@param minor: the drbd minor whose settings we change
|
1142 |
@type kbytes: int
|
1143 |
@param kbytes: the speed in kbytes/second
|
1144 |
@rtype: boolean
|
1145 |
@return: the success of the operation
|
1146 |
|
1147 |
"""
|
1148 |
result = utils.RunCmd(["drbdsetup", cls._DevPath(minor), "syncer", |
1149 |
"-r", "%d" % kbytes, "--create-device"]) |
1150 |
if result.failed:
|
1151 |
logging.error("Can't change syncer rate: %s - %s",
|
1152 |
result.fail_reason, result.output) |
1153 |
return not result.failed |
1154 |
|
1155 |
def SetSyncSpeed(self, kbytes): |
1156 |
"""Set the speed of the DRBD syncer.
|
1157 |
|
1158 |
@type kbytes: int
|
1159 |
@param kbytes: the speed in kbytes/second
|
1160 |
@rtype: boolean
|
1161 |
@return: the success of the operation
|
1162 |
|
1163 |
"""
|
1164 |
if self.minor is None: |
1165 |
logging.info("Not attached during SetSyncSpeed")
|
1166 |
return False |
1167 |
children_result = super(DRBD8, self).SetSyncSpeed(kbytes) |
1168 |
return self._SetMinorSyncSpeed(self.minor, kbytes) and children_result |
1169 |
|
1170 |
def GetProcStatus(self): |
1171 |
"""Return device data from /proc.
|
1172 |
|
1173 |
"""
|
1174 |
if self.minor is None: |
1175 |
_ThrowError("drbd%d: GetStats() called while not attached", self._aminor) |
1176 |
proc_info = self._MassageProcData(self._GetProcData()) |
1177 |
if self.minor not in proc_info: |
1178 |
_ThrowError("drbd%d: can't find myself in /proc", self.minor) |
1179 |
return DRBD8Status(proc_info[self.minor]) |
1180 |
|
1181 |
def GetSyncStatus(self): |
1182 |
"""Returns the sync status of the device.
|
1183 |
|
1184 |
|
1185 |
If sync_percent is None, it means all is ok
|
1186 |
If estimated_time is None, it means we can't esimate
|
1187 |
the time needed, otherwise it's the time left in seconds.
|
1188 |
|
1189 |
|
1190 |
We set the is_degraded parameter to True on two conditions:
|
1191 |
network not connected or local disk missing.
|
1192 |
|
1193 |
We compute the ldisk parameter based on wheter we have a local
|
1194 |
disk or not.
|
1195 |
|
1196 |
@rtype: tuple
|
1197 |
@return: (sync_percent, estimated_time, is_degraded, ldisk)
|
1198 |
|
1199 |
"""
|
1200 |
if self.minor is None and not self.Attach(): |
1201 |
_ThrowError("drbd%d: can't Attach() in GetSyncStatus", self._aminor) |
1202 |
stats = self.GetProcStatus()
|
1203 |
ldisk = not stats.is_disk_uptodate
|
1204 |
is_degraded = not stats.is_connected
|
1205 |
return stats.sync_percent, stats.est_time, is_degraded or ldisk, ldisk |
1206 |
|
1207 |
def Open(self, force=False): |
1208 |
"""Make the local state primary.
|
1209 |
|
1210 |
If the 'force' parameter is given, the '-o' option is passed to
|
1211 |
drbdsetup. Since this is a potentially dangerous operation, the
|
1212 |
force flag should be only given after creation, when it actually
|
1213 |
is mandatory.
|
1214 |
|
1215 |
"""
|
1216 |
if self.minor is None and not self.Attach(): |
1217 |
logging.error("DRBD cannot attach to a device during open")
|
1218 |
return False |
1219 |
cmd = ["drbdsetup", self.dev_path, "primary"] |
1220 |
if force:
|
1221 |
cmd.append("-o")
|
1222 |
result = utils.RunCmd(cmd) |
1223 |
if result.failed:
|
1224 |
_ThrowError("drbd%d: can't make drbd device primary: %s", self.minor, |
1225 |
result.output) |
1226 |
|
1227 |
def Close(self): |
1228 |
"""Make the local state secondary.
|
1229 |
|
1230 |
This will, of course, fail if the device is in use.
|
1231 |
|
1232 |
"""
|
1233 |
if self.minor is None and not self.Attach(): |
1234 |
_ThrowError("drbd%d: can't Attach() in Close()", self._aminor) |
1235 |
result = utils.RunCmd(["drbdsetup", self.dev_path, "secondary"]) |
1236 |
if result.failed:
|
1237 |
_ThrowError("drbd%d: can't switch drbd device to secondary: %s",
|
1238 |
self.minor, result.output)
|
1239 |
|
1240 |
def DisconnectNet(self): |
1241 |
"""Removes network configuration.
|
1242 |
|
1243 |
This method shutdowns the network side of the device.
|
1244 |
|
1245 |
The method will wait up to a hardcoded timeout for the device to
|
1246 |
go into standalone after the 'disconnect' command before
|
1247 |
re-configuring it, as sometimes it takes a while for the
|
1248 |
disconnect to actually propagate and thus we might issue a 'net'
|
1249 |
command while the device is still connected. If the device will
|
1250 |
still be attached to the network and we time out, we raise an
|
1251 |
exception.
|
1252 |
|
1253 |
"""
|
1254 |
if self.minor is None: |
1255 |
_ThrowError("drbd%d: disk not attached in re-attach net", self._aminor) |
1256 |
|
1257 |
if None in (self._lhost, self._lport, self._rhost, self._rport): |
1258 |
_ThrowError("drbd%d: DRBD disk missing network info in"
|
1259 |
" DisconnectNet()", self.minor) |
1260 |
|
1261 |
ever_disconnected = _IgnoreError(self._ShutdownNet, self.minor) |
1262 |
timeout_limit = time.time() + self._NET_RECONFIG_TIMEOUT
|
1263 |
sleep_time = 0.100 # we start the retry time at 100 miliseconds |
1264 |
while time.time() < timeout_limit:
|
1265 |
status = self.GetProcStatus()
|
1266 |
if status.is_standalone:
|
1267 |
break
|
1268 |
# retry the disconnect, it seems possible that due to a
|
1269 |
# well-time disconnect on the peer, my disconnect command might
|
1270 |
# be ingored and forgotten
|
1271 |
ever_disconnected = _IgnoreError(self._ShutdownNet, self.minor) or \ |
1272 |
ever_disconnected |
1273 |
time.sleep(sleep_time) |
1274 |
sleep_time = min(2, sleep_time * 1.5) |
1275 |
|
1276 |
if not status.is_standalone: |
1277 |
if ever_disconnected:
|
1278 |
msg = ("drbd%d: device did not react to the"
|
1279 |
" 'disconnect' command in a timely manner")
|
1280 |
else:
|
1281 |
msg = "drbd%d: can't shutdown network, even after multiple retries"
|
1282 |
_ThrowError(msg, self.minor)
|
1283 |
|
1284 |
reconfig_time = time.time() - timeout_limit + self._NET_RECONFIG_TIMEOUT
|
1285 |
if reconfig_time > 15: # hardcoded alert limit |
1286 |
logging.info("drbd%d: DisconnectNet: detach took %.3f seconds",
|
1287 |
self.minor, reconfig_time)
|
1288 |
|
1289 |
def AttachNet(self, multimaster): |
1290 |
"""Reconnects the network.
|
1291 |
|
1292 |
This method connects the network side of the device with a
|
1293 |
specified multi-master flag. The device needs to be 'Standalone'
|
1294 |
but have valid network configuration data.
|
1295 |
|
1296 |
Args:
|
1297 |
- multimaster: init the network in dual-primary mode
|
1298 |
|
1299 |
"""
|
1300 |
if self.minor is None: |
1301 |
_ThrowError("drbd%d: device not attached in AttachNet", self._aminor) |
1302 |
|
1303 |
if None in (self._lhost, self._lport, self._rhost, self._rport): |
1304 |
_ThrowError("drbd%d: missing network info in AttachNet()", self.minor) |
1305 |
|
1306 |
status = self.GetProcStatus()
|
1307 |
|
1308 |
if not status.is_standalone: |
1309 |
_ThrowError("drbd%d: device is not standalone in AttachNet", self.minor) |
1310 |
|
1311 |
self._AssembleNet(self.minor, |
1312 |
(self._lhost, self._lport, self._rhost, self._rport), |
1313 |
constants.DRBD_NET_PROTOCOL, dual_pri=multimaster, |
1314 |
hmac=constants.DRBD_HMAC_ALG, secret=self._secret)
|
1315 |
|
1316 |
def Attach(self): |
1317 |
"""Check if our minor is configured.
|
1318 |
|
1319 |
This doesn't do any device configurations - it only checks if the
|
1320 |
minor is in a state different from Unconfigured.
|
1321 |
|
1322 |
Note that this function will not change the state of the system in
|
1323 |
any way (except in case of side-effects caused by reading from
|
1324 |
/proc).
|
1325 |
|
1326 |
"""
|
1327 |
used_devs = self.GetUsedDevs()
|
1328 |
if self._aminor in used_devs: |
1329 |
minor = self._aminor
|
1330 |
else:
|
1331 |
minor = None
|
1332 |
|
1333 |
self._SetFromMinor(minor)
|
1334 |
return minor is not None |
1335 |
|
1336 |
def Assemble(self): |
1337 |
"""Assemble the drbd.
|
1338 |
|
1339 |
Method:
|
1340 |
- if we have a configured device, we try to ensure that it matches
|
1341 |
our config
|
1342 |
- if not, we create it from zero
|
1343 |
|
1344 |
"""
|
1345 |
super(DRBD8, self).Assemble() |
1346 |
|
1347 |
self.Attach()
|
1348 |
if self.minor is None: |
1349 |
# local device completely unconfigured
|
1350 |
self._FastAssemble()
|
1351 |
else:
|
1352 |
# we have to recheck the local and network status and try to fix
|
1353 |
# the device
|
1354 |
self._SlowAssemble()
|
1355 |
|
1356 |
def _SlowAssemble(self): |
1357 |
"""Assembles the DRBD device from a (partially) configured device.
|
1358 |
|
1359 |
In case of partially attached (local device matches but no network
|
1360 |
setup), we perform the network attach. If successful, we re-test
|
1361 |
the attach if can return success.
|
1362 |
|
1363 |
"""
|
1364 |
net_data = (self._lhost, self._lport, self._rhost, self._rport) |
1365 |
for minor in (self._aminor,): |
1366 |
info = self._GetDevInfo(self._GetShowData(minor)) |
1367 |
match_l = self._MatchesLocal(info)
|
1368 |
match_r = self._MatchesNet(info)
|
1369 |
|
1370 |
if match_l and match_r: |
1371 |
# everything matches
|
1372 |
break
|
1373 |
|
1374 |
if match_l and not match_r and "local_addr" not in info: |
1375 |
# disk matches, but not attached to network, attach and recheck
|
1376 |
self._AssembleNet(minor, net_data, constants.DRBD_NET_PROTOCOL,
|
1377 |
hmac=constants.DRBD_HMAC_ALG, secret=self._secret)
|
1378 |
if self._MatchesNet(self._GetDevInfo(self._GetShowData(minor))): |
1379 |
break
|
1380 |
else:
|
1381 |
_ThrowError("drbd%d: network attach successful, but 'drbdsetup"
|
1382 |
" show' disagrees", minor)
|
1383 |
|
1384 |
if match_r and "local_dev" not in info: |
1385 |
# no local disk, but network attached and it matches
|
1386 |
self._AssembleLocal(minor, self._children[0].dev_path, |
1387 |
self._children[1].dev_path) |
1388 |
if self._MatchesNet(self._GetDevInfo(self._GetShowData(minor))): |
1389 |
break
|
1390 |
else:
|
1391 |
_ThrowError("drbd%d: disk attach successful, but 'drbdsetup"
|
1392 |
" show' disagrees", minor)
|
1393 |
|
1394 |
# this case must be considered only if we actually have local
|
1395 |
# storage, i.e. not in diskless mode, because all diskless
|
1396 |
# devices are equal from the point of view of local
|
1397 |
# configuration
|
1398 |
if (match_l and "local_dev" in info and |
1399 |
not match_r and "local_addr" in info): |
1400 |
# strange case - the device network part points to somewhere
|
1401 |
# else, even though its local storage is ours; as we own the
|
1402 |
# drbd space, we try to disconnect from the remote peer and
|
1403 |
# reconnect to our correct one
|
1404 |
try:
|
1405 |
self._ShutdownNet(minor)
|
1406 |
except errors.BlockDeviceError, err:
|
1407 |
_ThrowError("Device has correct local storage, wrong remote peer"
|
1408 |
" and is unable to disconnect in order to attach to"
|
1409 |
" the correct peer: %s", str(err)) |
1410 |
# note: _AssembleNet also handles the case when we don't want
|
1411 |
# local storage (i.e. one or more of the _[lr](host|port) is
|
1412 |
# None)
|
1413 |
self._AssembleNet(minor, net_data, constants.DRBD_NET_PROTOCOL,
|
1414 |
hmac=constants.DRBD_HMAC_ALG, secret=self._secret)
|
1415 |
if self._MatchesNet(self._GetDevInfo(self._GetShowData(minor))): |
1416 |
break
|
1417 |
else:
|
1418 |
_ThrowError("drbd%d: network attach successful, but 'drbdsetup"
|
1419 |
" show' disagrees", minor)
|
1420 |
|
1421 |
else:
|
1422 |
minor = None
|
1423 |
|
1424 |
self._SetFromMinor(minor)
|
1425 |
if minor is None: |
1426 |
_ThrowError("drbd%d: cannot activate, unknown or unhandled reason",
|
1427 |
self._aminor)
|
1428 |
|
1429 |
def _FastAssemble(self): |
1430 |
"""Assemble the drbd device from zero.
|
1431 |
|
1432 |
This is run when in Assemble we detect our minor is unused.
|
1433 |
|
1434 |
"""
|
1435 |
minor = self._aminor
|
1436 |
if self._children and self._children[0] and self._children[1]: |
1437 |
self._AssembleLocal(minor, self._children[0].dev_path, |
1438 |
self._children[1].dev_path) |
1439 |
if self._lhost and self._lport and self._rhost and self._rport: |
1440 |
self._AssembleNet(minor,
|
1441 |
(self._lhost, self._lport, self._rhost, self._rport), |
1442 |
constants.DRBD_NET_PROTOCOL, |
1443 |
hmac=constants.DRBD_HMAC_ALG, secret=self._secret)
|
1444 |
self._SetFromMinor(minor)
|
1445 |
|
1446 |
@classmethod
|
1447 |
def _ShutdownLocal(cls, minor): |
1448 |
"""Detach from the local device.
|
1449 |
|
1450 |
I/Os will continue to be served from the remote device. If we
|
1451 |
don't have a remote device, this operation will fail.
|
1452 |
|
1453 |
"""
|
1454 |
result = utils.RunCmd(["drbdsetup", cls._DevPath(minor), "detach"]) |
1455 |
if result.failed:
|
1456 |
_ThrowError("drbd%d: can't detach local disk: %s", minor, result.output)
|
1457 |
|
1458 |
@classmethod
|
1459 |
def _ShutdownNet(cls, minor): |
1460 |
"""Disconnect from the remote peer.
|
1461 |
|
1462 |
This fails if we don't have a local device.
|
1463 |
|
1464 |
"""
|
1465 |
result = utils.RunCmd(["drbdsetup", cls._DevPath(minor), "disconnect"]) |
1466 |
if result.failed:
|
1467 |
_ThrowError("drbd%d: can't shutdown network: %s", minor, result.output)
|
1468 |
|
1469 |
@classmethod
|
1470 |
def _ShutdownAll(cls, minor): |
1471 |
"""Deactivate the device.
|
1472 |
|
1473 |
This will, of course, fail if the device is in use.
|
1474 |
|
1475 |
"""
|
1476 |
result = utils.RunCmd(["drbdsetup", cls._DevPath(minor), "down"]) |
1477 |
if result.failed:
|
1478 |
_ThrowError("Can't shutdown drbd device: %s", result.output)
|
1479 |
|
1480 |
def Shutdown(self): |
1481 |
"""Shutdown the DRBD device.
|
1482 |
|
1483 |
"""
|
1484 |
if self.minor is None and not self.Attach(): |
1485 |
logging.info("drbd%d: not attached during Shutdown()", self._aminor) |
1486 |
return
|
1487 |
minor = self.minor
|
1488 |
self.minor = None |
1489 |
self.dev_path = None |
1490 |
self._ShutdownAll(minor)
|
1491 |
|
1492 |
def Remove(self): |
1493 |
"""Stub remove for DRBD devices.
|
1494 |
|
1495 |
"""
|
1496 |
self.Shutdown()
|
1497 |
|
1498 |
@classmethod
|
1499 |
def Create(cls, unique_id, children, size): |
1500 |
"""Create a new DRBD8 device.
|
1501 |
|
1502 |
Since DRBD devices are not created per se, just assembled, this
|
1503 |
function only initializes the metadata.
|
1504 |
|
1505 |
"""
|
1506 |
if len(children) != 2: |
1507 |
raise errors.ProgrammerError("Invalid setup for the drbd device") |
1508 |
# check that the minor is unused
|
1509 |
aminor = unique_id[4]
|
1510 |
proc_info = cls._MassageProcData(cls._GetProcData()) |
1511 |
if aminor in proc_info: |
1512 |
status = DRBD8Status(proc_info[aminor]) |
1513 |
in_use = status.is_in_use |
1514 |
else:
|
1515 |
in_use = False
|
1516 |
if in_use:
|
1517 |
_ThrowError("DRBD minor %d already in use at Create() time", aminor)
|
1518 |
meta = children[1]
|
1519 |
meta.Assemble() |
1520 |
if not meta.Attach(): |
1521 |
raise errors.BlockDeviceError("Can't attach to meta device") |
1522 |
cls._CheckMetaSize(meta.dev_path) |
1523 |
cls._InitMeta(aminor, meta.dev_path) |
1524 |
return cls(unique_id, children)
|
1525 |
|
1526 |
def Grow(self, amount): |
1527 |
"""Resize the DRBD device and its backing storage.
|
1528 |
|
1529 |
"""
|
1530 |
if self.minor is None: |
1531 |
_ThrowError("drbd%d: Grow called while not attached", self._aminor) |
1532 |
if len(self._children) != 2 or None in self._children: |
1533 |
_ThrowError("drbd%d: cannot grow diskless device", self.minor) |
1534 |
self._children[0].Grow(amount) |
1535 |
result = utils.RunCmd(["drbdsetup", self.dev_path, "resize"]) |
1536 |
if result.failed:
|
1537 |
_ThrowError("drbd%d: resize failed: %s", self.minor, result.output) |
1538 |
|
1539 |
|
1540 |
class FileStorage(BlockDev): |
1541 |
"""File device.
|
1542 |
|
1543 |
This class represents the a file storage backend device.
|
1544 |
|
1545 |
The unique_id for the file device is a (file_driver, file_path) tuple.
|
1546 |
|
1547 |
"""
|
1548 |
def __init__(self, unique_id, children): |
1549 |
"""Initalizes a file device backend.
|
1550 |
|
1551 |
"""
|
1552 |
if children:
|
1553 |
raise errors.BlockDeviceError("Invalid setup for file device") |
1554 |
super(FileStorage, self).__init__(unique_id, children) |
1555 |
if not isinstance(unique_id, (tuple, list)) or len(unique_id) != 2: |
1556 |
raise ValueError("Invalid configuration data %s" % str(unique_id)) |
1557 |
self.driver = unique_id[0] |
1558 |
self.dev_path = unique_id[1] |
1559 |
self.Attach()
|
1560 |
|
1561 |
def Assemble(self): |
1562 |
"""Assemble the device.
|
1563 |
|
1564 |
Checks whether the file device exists, raises BlockDeviceError otherwise.
|
1565 |
|
1566 |
"""
|
1567 |
if not os.path.exists(self.dev_path): |
1568 |
_ThrowError("File device '%s' does not exist" % self.dev_path) |
1569 |
|
1570 |
def Shutdown(self): |
1571 |
"""Shutdown the device.
|
1572 |
|
1573 |
This is a no-op for the file type, as we don't deacivate
|
1574 |
the file on shutdown.
|
1575 |
|
1576 |
"""
|
1577 |
pass
|
1578 |
|
1579 |
def Open(self, force=False): |
1580 |
"""Make the device ready for I/O.
|
1581 |
|
1582 |
This is a no-op for the file type.
|
1583 |
|
1584 |
"""
|
1585 |
pass
|
1586 |
|
1587 |
def Close(self): |
1588 |
"""Notifies that the device will no longer be used for I/O.
|
1589 |
|
1590 |
This is a no-op for the file type.
|
1591 |
|
1592 |
"""
|
1593 |
pass
|
1594 |
|
1595 |
def Remove(self): |
1596 |
"""Remove the file backing the block device.
|
1597 |
|
1598 |
@rtype: boolean
|
1599 |
@return: True if the removal was successful
|
1600 |
|
1601 |
"""
|
1602 |
try:
|
1603 |
os.remove(self.dev_path)
|
1604 |
except OSError, err: |
1605 |
if err.errno != errno.ENOENT:
|
1606 |
_ThrowError("Can't remove file '%s': %s", self.dev_path, err) |
1607 |
|
1608 |
def Attach(self): |
1609 |
"""Attach to an existing file.
|
1610 |
|
1611 |
Check if this file already exists.
|
1612 |
|
1613 |
@rtype: boolean
|
1614 |
@return: True if file exists
|
1615 |
|
1616 |
"""
|
1617 |
self.attached = os.path.exists(self.dev_path) |
1618 |
return self.attached |
1619 |
|
1620 |
@classmethod
|
1621 |
def Create(cls, unique_id, children, size): |
1622 |
"""Create a new file.
|
1623 |
|
1624 |
@param size: the size of file in MiB
|
1625 |
|
1626 |
@rtype: L{bdev.FileStorage}
|
1627 |
@return: an instance of FileStorage
|
1628 |
|
1629 |
"""
|
1630 |
# TODO: decide whether we should check for existing files and
|
1631 |
# abort or not
|
1632 |
if not isinstance(unique_id, (tuple, list)) or len(unique_id) != 2: |
1633 |
raise ValueError("Invalid configuration data %s" % str(unique_id)) |
1634 |
dev_path = unique_id[1]
|
1635 |
try:
|
1636 |
f = open(dev_path, 'w') |
1637 |
f.truncate(size * 1024 * 1024) |
1638 |
f.close() |
1639 |
except IOError, err: |
1640 |
_ThrowError("Error in file creation: %", str(err)) |
1641 |
|
1642 |
return FileStorage(unique_id, children)
|
1643 |
|
1644 |
|
1645 |
DEV_MAP = { |
1646 |
constants.LD_LV: LogicalVolume, |
1647 |
constants.LD_DRBD8: DRBD8, |
1648 |
constants.LD_FILE: FileStorage, |
1649 |
} |
1650 |
|
1651 |
|
1652 |
def FindDevice(dev_type, unique_id, children): |
1653 |
"""Search for an existing, assembled device.
|
1654 |
|
1655 |
This will succeed only if the device exists and is assembled, but it
|
1656 |
does not do any actions in order to activate the device.
|
1657 |
|
1658 |
"""
|
1659 |
if dev_type not in DEV_MAP: |
1660 |
raise errors.ProgrammerError("Invalid block device type '%s'" % dev_type) |
1661 |
device = DEV_MAP[dev_type](unique_id, children) |
1662 |
if not device.attached: |
1663 |
return None |
1664 |
return device
|
1665 |
|
1666 |
|
1667 |
def Assemble(dev_type, unique_id, children): |
1668 |
"""Try to attach or assemble an existing device.
|
1669 |
|
1670 |
This will attach to assemble the device, as needed, to bring it
|
1671 |
fully up. It must be safe to run on already-assembled devices.
|
1672 |
|
1673 |
"""
|
1674 |
if dev_type not in DEV_MAP: |
1675 |
raise errors.ProgrammerError("Invalid block device type '%s'" % dev_type) |
1676 |
device = DEV_MAP[dev_type](unique_id, children) |
1677 |
device.Assemble() |
1678 |
return device
|
1679 |
|
1680 |
|
1681 |
def Create(dev_type, unique_id, children, size): |
1682 |
"""Create a device.
|
1683 |
|
1684 |
"""
|
1685 |
if dev_type not in DEV_MAP: |
1686 |
raise errors.ProgrammerError("Invalid block device type '%s'" % dev_type) |
1687 |
device = DEV_MAP[dev_type].Create(unique_id, children, size) |
1688 |
return device
|