root / lib / block / drbd.py @ 38396ae2
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# Copyright (C) 2006, 2007, 2010, 2011, 2012, 2013 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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"""DRBD block device related functionality"""
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import errno |
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import logging |
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import pyparsing as pyp |
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import re |
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import shlex |
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import time |
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from ganeti import constants |
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from ganeti import utils |
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from ganeti import errors |
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from ganeti import compat |
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from ganeti import netutils |
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from ganeti import objects |
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from ganeti.block import base |
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# Size of reads in _CanReadDevice
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_DEVICE_READ_SIZE = 128 * 1024 |
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class BaseDRBD(base.BlockDev): # pylint: disable=W0223 |
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"""Base DRBD class.
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This class contains a few bits of common functionality between the
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0.7 and 8.x versions of DRBD.
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"""
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_VERSION_RE = re.compile(r"^version: (\d+)\.(\d+)\.(\d+)(?:\.\d+)?"
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r" \(api:(\d+)/proto:(\d+)(?:-(\d+))?\)")
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_VALID_LINE_RE = re.compile("^ *([0-9]+): cs:([^ ]+).*$")
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_UNUSED_LINE_RE = re.compile("^ *([0-9]+): cs:Unconfigured$")
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_DRBD_MAJOR = 147
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_ST_UNCONFIGURED = "Unconfigured"
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_ST_WFCONNECTION = "WFConnection"
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_ST_CONNECTED = "Connected"
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_STATUS_FILE = constants.DRBD_STATUS_FILE |
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_USERMODE_HELPER_FILE = "/sys/module/drbd/parameters/usermode_helper"
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@staticmethod
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def _GetProcData(filename=_STATUS_FILE): |
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"""Return data from /proc/drbd.
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"""
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try:
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data = utils.ReadFile(filename).splitlines() |
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except EnvironmentError, err: |
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if err.errno == errno.ENOENT:
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base.ThrowError("The file %s cannot be opened, check if the module"
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" is loaded (%s)", filename, str(err)) |
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else:
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base.ThrowError("Can't read the DRBD proc file %s: %s",
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filename, str(err))
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if not data: |
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base.ThrowError("Can't read any data from %s", filename)
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return data
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@classmethod
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def _JoinProcDataPerMinor(cls, data): |
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"""Transform the output of _GetProdData into a nicer form.
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@return: a dictionary of minor: joined lines from /proc/drbd
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for that minor
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"""
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results = {} |
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old_minor = old_line = None
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for line in data: |
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if not line: # completely empty lines, as can be returned by drbd8.0+ |
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continue
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lresult = cls._VALID_LINE_RE.match(line) |
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if lresult is not None: |
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if old_minor is not None: |
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results[old_minor] = old_line |
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old_minor = int(lresult.group(1)) |
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old_line = line |
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else:
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if old_minor is not None: |
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old_line += " " + line.strip()
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# add last line
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if old_minor is not None: |
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results[old_minor] = old_line |
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return results
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@classmethod
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def _GetVersion(cls, proc_data): |
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"""Return the DRBD version.
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This will return a dict with keys:
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- k_major
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- k_minor
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- k_point
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- api
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- proto
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- proto2 (only on drbd > 8.2.X)
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"""
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first_line = proc_data[0].strip()
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version = cls._VERSION_RE.match(first_line) |
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if not version: |
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raise errors.BlockDeviceError("Can't parse DRBD version from '%s'" % |
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first_line) |
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values = version.groups() |
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retval = { |
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"k_major": int(values[0]), |
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"k_minor": int(values[1]), |
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"k_point": int(values[2]), |
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"api": int(values[3]), |
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"proto": int(values[4]), |
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} |
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if values[5] is not None: |
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retval["proto2"] = values[5] |
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return retval
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@staticmethod
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def GetUsermodeHelper(filename=_USERMODE_HELPER_FILE): |
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"""Returns DRBD usermode_helper currently set.
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"""
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try:
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helper = utils.ReadFile(filename).splitlines()[0]
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except EnvironmentError, err: |
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if err.errno == errno.ENOENT:
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base.ThrowError("The file %s cannot be opened, check if the module"
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" is loaded (%s)", filename, str(err)) |
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else:
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base.ThrowError("Can't read DRBD helper file %s: %s",
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filename, str(err))
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if not helper: |
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base.ThrowError("Can't read any data from %s", filename)
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return helper
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@staticmethod
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def _DevPath(minor): |
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"""Return the path to a drbd device for a given minor.
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"""
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return "/dev/drbd%d" % minor |
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@classmethod
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def GetUsedDevs(cls): |
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"""Compute the list of used DRBD devices.
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"""
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data = cls._GetProcData() |
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used_devs = {} |
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for line in data: |
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match = cls._VALID_LINE_RE.match(line) |
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if not match: |
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continue
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minor = int(match.group(1)) |
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state = match.group(2)
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if state == cls._ST_UNCONFIGURED:
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continue
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used_devs[minor] = state, line |
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return used_devs
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def _SetFromMinor(self, minor): |
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"""Set our parameters based on the given minor.
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This sets our minor variable and our dev_path.
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"""
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if minor is None: |
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self.minor = self.dev_path = None |
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self.attached = False |
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else:
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self.minor = minor
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self.dev_path = self._DevPath(minor) |
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self.attached = True |
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@staticmethod
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def _CheckMetaSize(meta_device): |
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"""Check if the given meta device looks like a valid one.
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This currently only checks the size, which must be around
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128MiB.
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"""
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result = utils.RunCmd(["blockdev", "--getsize", meta_device]) |
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if result.failed:
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base.ThrowError("Failed to get device size: %s - %s",
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result.fail_reason, result.output) |
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try:
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sectors = int(result.stdout)
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except (TypeError, ValueError): |
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base.ThrowError("Invalid output from blockdev: '%s'", result.stdout)
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num_bytes = sectors * 512
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if num_bytes < 128 * 1024 * 1024: # less than 128MiB |
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base.ThrowError("Meta device too small (%.2fMib)",
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(num_bytes / 1024 / 1024)) |
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# the maximum *valid* size of the meta device when living on top
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# of LVM is hard to compute: it depends on the number of stripes
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# and the PE size; e.g. a 2-stripe, 64MB PE will result in a 128MB
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# (normal size), but an eight-stripe 128MB PE will result in a 1GB
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# size meta device; as such, we restrict it to 1GB (a little bit
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# too generous, but making assumptions about PE size is hard)
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if num_bytes > 1024 * 1024 * 1024: |
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base.ThrowError("Meta device too big (%.2fMiB)",
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(num_bytes / 1024 / 1024)) |
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def Rename(self, new_id): |
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"""Rename a device.
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This is not supported for drbd devices.
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"""
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raise errors.ProgrammerError("Can't rename a drbd device") |
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class DRBD8Status(object): |
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"""A DRBD status representation class.
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Note that this doesn't support unconfigured devices (cs:Unconfigured).
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"""
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UNCONF_RE = re.compile(r"\s*[0-9]+:\s*cs:Unconfigured$")
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LINE_RE = re.compile(r"\s*[0-9]+:\s*cs:(\S+)\s+(?:st|ro):([^/]+)/(\S+)"
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"\s+ds:([^/]+)/(\S+)\s+.*$")
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SYNC_RE = re.compile(r"^.*\ssync'ed:\s*([0-9.]+)%.*"
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# Due to a bug in drbd in the kernel, introduced in
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# commit 4b0715f096 (still unfixed as of 2011-08-22)
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"(?:\s|M)"
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"finish: ([0-9]+):([0-9]+):([0-9]+)\s.*$")
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CS_UNCONFIGURED = "Unconfigured"
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CS_STANDALONE = "StandAlone"
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CS_WFCONNECTION = "WFConnection"
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CS_WFREPORTPARAMS = "WFReportParams"
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CS_CONNECTED = "Connected"
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CS_STARTINGSYNCS = "StartingSyncS"
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CS_STARTINGSYNCT = "StartingSyncT"
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CS_WFBITMAPS = "WFBitMapS"
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CS_WFBITMAPT = "WFBitMapT"
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CS_WFSYNCUUID = "WFSyncUUID"
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CS_SYNCSOURCE = "SyncSource"
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CS_SYNCTARGET = "SyncTarget"
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CS_PAUSEDSYNCS = "PausedSyncS"
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CS_PAUSEDSYNCT = "PausedSyncT"
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CSET_SYNC = compat.UniqueFrozenset([ |
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CS_WFREPORTPARAMS, |
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CS_STARTINGSYNCS, |
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CS_STARTINGSYNCT, |
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CS_WFBITMAPS, |
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CS_WFBITMAPT, |
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CS_WFSYNCUUID, |
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CS_SYNCSOURCE, |
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CS_SYNCTARGET, |
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CS_PAUSEDSYNCS, |
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CS_PAUSEDSYNCT, |
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]) |
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DS_DISKLESS = "Diskless"
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DS_ATTACHING = "Attaching" # transient state |
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DS_FAILED = "Failed" # transient state, next: diskless |
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DS_NEGOTIATING = "Negotiating" # transient state |
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DS_INCONSISTENT = "Inconsistent" # while syncing or after creation |
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DS_OUTDATED = "Outdated"
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DS_DUNKNOWN = "DUnknown" # shown for peer disk when not connected |
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DS_CONSISTENT = "Consistent"
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DS_UPTODATE = "UpToDate" # normal state |
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RO_PRIMARY = "Primary"
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RO_SECONDARY = "Secondary"
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RO_UNKNOWN = "Unknown"
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def __init__(self, procline): |
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u = self.UNCONF_RE.match(procline)
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if u:
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self.cstatus = self.CS_UNCONFIGURED |
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self.lrole = self.rrole = self.ldisk = self.rdisk = None |
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else:
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m = self.LINE_RE.match(procline)
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if not m: |
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raise errors.BlockDeviceError("Can't parse input data '%s'" % procline) |
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self.cstatus = m.group(1) |
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self.lrole = m.group(2) |
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self.rrole = m.group(3) |
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self.ldisk = m.group(4) |
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self.rdisk = m.group(5) |
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# end reading of data from the LINE_RE or UNCONF_RE
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self.is_standalone = self.cstatus == self.CS_STANDALONE |
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self.is_wfconn = self.cstatus == self.CS_WFCONNECTION |
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self.is_connected = self.cstatus == self.CS_CONNECTED |
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self.is_primary = self.lrole == self.RO_PRIMARY |
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self.is_secondary = self.lrole == self.RO_SECONDARY |
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self.peer_primary = self.rrole == self.RO_PRIMARY |
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self.peer_secondary = self.rrole == self.RO_SECONDARY |
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self.both_primary = self.is_primary and self.peer_primary |
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self.both_secondary = self.is_secondary and self.peer_secondary |
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self.is_diskless = self.ldisk == self.DS_DISKLESS |
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self.is_disk_uptodate = self.ldisk == self.DS_UPTODATE |
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self.is_in_resync = self.cstatus in self.CSET_SYNC |
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self.is_in_use = self.cstatus != self.CS_UNCONFIGURED |
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m = self.SYNC_RE.match(procline)
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if m:
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self.sync_percent = float(m.group(1)) |
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hours = int(m.group(2)) |
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minutes = int(m.group(3)) |
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seconds = int(m.group(4)) |
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self.est_time = hours * 3600 + minutes * 60 + seconds |
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else:
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# we have (in this if branch) no percent information, but if
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# we're resyncing we need to 'fake' a sync percent information,
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# as this is how cmdlib determines if it makes sense to wait for
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# resyncing or not
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if self.is_in_resync: |
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self.sync_percent = 0 |
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else:
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self.sync_percent = None |
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self.est_time = None |
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class DRBD8(BaseDRBD): |
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"""DRBD v8.x block device.
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This implements the local host part of the DRBD device, i.e. it
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doesn't do anything to the supposed peer. If you need a fully
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connected DRBD pair, you need to use this class on both hosts.
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The unique_id for the drbd device is a (local_ip, local_port,
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remote_ip, remote_port, local_minor, secret) tuple, and it must have
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two children: the data device and the meta_device. The meta device
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is checked for valid size and is zeroed on create.
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"""
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_MAX_MINORS = 255
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_PARSE_SHOW = None
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# timeout constants
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_NET_RECONFIG_TIMEOUT = 60
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# command line options for barriers
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_DISABLE_DISK_OPTION = "--no-disk-barrier" # -a |
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_DISABLE_DRAIN_OPTION = "--no-disk-drain" # -D |
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_DISABLE_FLUSH_OPTION = "--no-disk-flushes" # -i |
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_DISABLE_META_FLUSH_OPTION = "--no-md-flushes" # -m |
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def __init__(self, unique_id, children, size, params): |
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if children and children.count(None) > 0: |
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children = [] |
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if len(children) not in (0, 2): |
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raise ValueError("Invalid configuration data %s" % str(children)) |
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if not isinstance(unique_id, (tuple, list)) or len(unique_id) != 6: |
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raise ValueError("Invalid configuration data %s" % str(unique_id)) |
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(self._lhost, self._lport, |
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self._rhost, self._rport, |
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self._aminor, self._secret) = unique_id |
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if children:
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if not _CanReadDevice(children[1].dev_path): |
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logging.info("drbd%s: Ignoring unreadable meta device", self._aminor) |
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children = [] |
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super(DRBD8, self).__init__(unique_id, children, size, params) |
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self.major = self._DRBD_MAJOR |
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version = self._GetVersion(self._GetProcData()) |
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if version["k_major"] != 8: |
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base.ThrowError("Mismatch in DRBD kernel version and requested ganeti"
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" usage: kernel is %s.%s, ganeti wants 8.x",
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version["k_major"], version["k_minor"]) |
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if (self._lhost is not None and self._lhost == self._rhost and |
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self._lport == self._rport): |
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raise ValueError("Invalid configuration data, same local/remote %s" % |
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(unique_id,)) |
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self.Attach()
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@classmethod
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def _InitMeta(cls, minor, dev_path): |
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"""Initialize a meta device.
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This will not work if the given minor is in use.
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"""
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# Zero the metadata first, in order to make sure drbdmeta doesn't
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# try to auto-detect existing filesystems or similar (see
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# http://code.google.com/p/ganeti/issues/detail?id=182); we only
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# care about the first 128MB of data in the device, even though it
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# can be bigger
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result = utils.RunCmd([constants.DD_CMD, |
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"if=/dev/zero", "of=%s" % dev_path, |
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"bs=1048576", "count=128", "oflag=direct"]) |
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if result.failed:
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base.ThrowError("Can't wipe the meta device: %s", result.output)
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result = utils.RunCmd(["drbdmeta", "--force", cls._DevPath(minor), |
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"v08", dev_path, "0", "create-md"]) |
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if result.failed:
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base.ThrowError("Can't initialize meta device: %s", result.output)
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@classmethod
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def _FindUnusedMinor(cls): |
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"""Find an unused DRBD device.
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This is specific to 8.x as the minors are allocated dynamically,
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so non-existing numbers up to a max minor count are actually free.
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"""
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data = cls._GetProcData() |
433 |
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highest = None
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for line in data: |
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match = cls._UNUSED_LINE_RE.match(line) |
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if match:
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return int(match.group(1)) |
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match = cls._VALID_LINE_RE.match(line) |
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if match:
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minor = int(match.group(1)) |
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highest = max(highest, minor)
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if highest is None: # there are no minors in use at all |
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return 0 |
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if highest >= cls._MAX_MINORS:
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logging.error("Error: no free drbd minors!")
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raise errors.BlockDeviceError("Can't find a free DRBD minor") |
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return highest + 1 |
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|
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@classmethod
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def _GetShowParser(cls): |
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"""Return a parser for `drbd show` output.
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This will either create or return an already-created parser for the
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output of the command `drbd show`.
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"""
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if cls._PARSE_SHOW is not None: |
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return cls._PARSE_SHOW
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|
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# pyparsing setup
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lbrace = pyp.Literal("{").suppress()
|
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rbrace = pyp.Literal("}").suppress()
|
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lbracket = pyp.Literal("[").suppress()
|
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rbracket = pyp.Literal("]").suppress()
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semi = pyp.Literal(";").suppress()
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colon = pyp.Literal(":").suppress()
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# this also converts the value to an int
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number = pyp.Word(pyp.nums).setParseAction(lambda s, l, t: int(t[0])) |
470 |
|
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comment = pyp.Literal("#") + pyp.Optional(pyp.restOfLine)
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defa = pyp.Literal("_is_default").suppress()
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dbl_quote = pyp.Literal('"').suppress()
|
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|
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keyword = pyp.Word(pyp.alphanums + "-")
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|
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# value types
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value = pyp.Word(pyp.alphanums + "_-/.:")
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quoted = dbl_quote + pyp.CharsNotIn('"') + dbl_quote
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ipv4_addr = (pyp.Optional(pyp.Literal("ipv4")).suppress() +
|
481 |
pyp.Word(pyp.nums + ".") + colon + number)
|
482 |
ipv6_addr = (pyp.Optional(pyp.Literal("ipv6")).suppress() +
|
483 |
pyp.Optional(lbracket) + pyp.Word(pyp.hexnums + ":") +
|
484 |
pyp.Optional(rbracket) + colon + number) |
485 |
# meta device, extended syntax
|
486 |
meta_value = ((value ^ quoted) + lbracket + number + rbracket) |
487 |
# device name, extended syntax
|
488 |
device_value = pyp.Literal("minor").suppress() + number
|
489 |
|
490 |
# a statement
|
491 |
stmt = (~rbrace + keyword + ~lbrace + |
492 |
pyp.Optional(ipv4_addr ^ ipv6_addr ^ value ^ quoted ^ meta_value ^ |
493 |
device_value) + |
494 |
pyp.Optional(defa) + semi + |
495 |
pyp.Optional(pyp.restOfLine).suppress()) |
496 |
|
497 |
# an entire section
|
498 |
section_name = pyp.Word(pyp.alphas + "_")
|
499 |
section = section_name + lbrace + pyp.ZeroOrMore(pyp.Group(stmt)) + rbrace |
500 |
|
501 |
bnf = pyp.ZeroOrMore(pyp.Group(section ^ stmt)) |
502 |
bnf.ignore(comment) |
503 |
|
504 |
cls._PARSE_SHOW = bnf |
505 |
|
506 |
return bnf
|
507 |
|
508 |
@classmethod
|
509 |
def _GetShowData(cls, minor): |
510 |
"""Return the `drbdsetup show` data for a minor.
|
511 |
|
512 |
"""
|
513 |
result = utils.RunCmd(["drbdsetup", cls._DevPath(minor), "show"]) |
514 |
if result.failed:
|
515 |
logging.error("Can't display the drbd config: %s - %s",
|
516 |
result.fail_reason, result.output) |
517 |
return None |
518 |
return result.stdout
|
519 |
|
520 |
@classmethod
|
521 |
def _GetDevInfo(cls, out): |
522 |
"""Parse details about a given DRBD minor.
|
523 |
|
524 |
This return, if available, the local backing device (as a path)
|
525 |
and the local and remote (ip, port) information from a string
|
526 |
containing the output of the `drbdsetup show` command as returned
|
527 |
by _GetShowData.
|
528 |
|
529 |
"""
|
530 |
data = {} |
531 |
if not out: |
532 |
return data
|
533 |
|
534 |
bnf = cls._GetShowParser() |
535 |
# run pyparse
|
536 |
|
537 |
try:
|
538 |
results = bnf.parseString(out) |
539 |
except pyp.ParseException, err:
|
540 |
base.ThrowError("Can't parse drbdsetup show output: %s", str(err)) |
541 |
|
542 |
# and massage the results into our desired format
|
543 |
for section in results: |
544 |
sname = section[0]
|
545 |
if sname == "_this_host": |
546 |
for lst in section[1:]: |
547 |
if lst[0] == "disk": |
548 |
data["local_dev"] = lst[1] |
549 |
elif lst[0] == "meta-disk": |
550 |
data["meta_dev"] = lst[1] |
551 |
data["meta_index"] = lst[2] |
552 |
elif lst[0] == "address": |
553 |
data["local_addr"] = tuple(lst[1:]) |
554 |
elif sname == "_remote_host": |
555 |
for lst in section[1:]: |
556 |
if lst[0] == "address": |
557 |
data["remote_addr"] = tuple(lst[1:]) |
558 |
return data
|
559 |
|
560 |
def _MatchesLocal(self, info): |
561 |
"""Test if our local config matches with an existing device.
|
562 |
|
563 |
The parameter should be as returned from `_GetDevInfo()`. This
|
564 |
method tests if our local backing device is the same as the one in
|
565 |
the info parameter, in effect testing if we look like the given
|
566 |
device.
|
567 |
|
568 |
"""
|
569 |
if self._children: |
570 |
backend, meta = self._children
|
571 |
else:
|
572 |
backend = meta = None
|
573 |
|
574 |
if backend is not None: |
575 |
retval = ("local_dev" in info and info["local_dev"] == backend.dev_path) |
576 |
else:
|
577 |
retval = ("local_dev" not in info) |
578 |
|
579 |
if meta is not None: |
580 |
retval = retval and ("meta_dev" in info and |
581 |
info["meta_dev"] == meta.dev_path)
|
582 |
retval = retval and ("meta_index" in info and |
583 |
info["meta_index"] == 0) |
584 |
else:
|
585 |
retval = retval and ("meta_dev" not in info and |
586 |
"meta_index" not in info) |
587 |
return retval
|
588 |
|
589 |
def _MatchesNet(self, info): |
590 |
"""Test if our network config matches with an existing device.
|
591 |
|
592 |
The parameter should be as returned from `_GetDevInfo()`. This
|
593 |
method tests if our network configuration is the same as the one
|
594 |
in the info parameter, in effect testing if we look like the given
|
595 |
device.
|
596 |
|
597 |
"""
|
598 |
if (((self._lhost is None and not ("local_addr" in info)) and |
599 |
(self._rhost is None and not ("remote_addr" in info)))): |
600 |
return True |
601 |
|
602 |
if self._lhost is None: |
603 |
return False |
604 |
|
605 |
if not ("local_addr" in info and |
606 |
"remote_addr" in info): |
607 |
return False |
608 |
|
609 |
retval = (info["local_addr"] == (self._lhost, self._lport)) |
610 |
retval = (retval and
|
611 |
info["remote_addr"] == (self._rhost, self._rport)) |
612 |
return retval
|
613 |
|
614 |
def _AssembleLocal(self, minor, backend, meta, size): |
615 |
"""Configure the local part of a DRBD device.
|
616 |
|
617 |
"""
|
618 |
args = ["drbdsetup", self._DevPath(minor), "disk", |
619 |
backend, meta, "0",
|
620 |
"-e", "detach", |
621 |
"--create-device"]
|
622 |
if size:
|
623 |
args.extend(["-d", "%sm" % size]) |
624 |
|
625 |
version = self._GetVersion(self._GetProcData()) |
626 |
vmaj = version["k_major"]
|
627 |
vmin = version["k_minor"]
|
628 |
vrel = version["k_point"]
|
629 |
|
630 |
barrier_args = \ |
631 |
self._ComputeDiskBarrierArgs(vmaj, vmin, vrel,
|
632 |
self.params[constants.LDP_BARRIERS],
|
633 |
self.params[constants.LDP_NO_META_FLUSH])
|
634 |
args.extend(barrier_args) |
635 |
|
636 |
if self.params[constants.LDP_DISK_CUSTOM]: |
637 |
args.extend(shlex.split(self.params[constants.LDP_DISK_CUSTOM]))
|
638 |
|
639 |
result = utils.RunCmd(args) |
640 |
if result.failed:
|
641 |
base.ThrowError("drbd%d: can't attach local disk: %s",
|
642 |
minor, result.output) |
643 |
|
644 |
@classmethod
|
645 |
def _ComputeDiskBarrierArgs(cls, vmaj, vmin, vrel, disabled_barriers, |
646 |
disable_meta_flush): |
647 |
"""Compute the DRBD command line parameters for disk barriers
|
648 |
|
649 |
Returns a list of the disk barrier parameters as requested via the
|
650 |
disabled_barriers and disable_meta_flush arguments, and according to the
|
651 |
supported ones in the DRBD version vmaj.vmin.vrel
|
652 |
|
653 |
If the desired option is unsupported, raises errors.BlockDeviceError.
|
654 |
|
655 |
"""
|
656 |
disabled_barriers_set = frozenset(disabled_barriers)
|
657 |
if not disabled_barriers_set in constants.DRBD_VALID_BARRIER_OPT: |
658 |
raise errors.BlockDeviceError("%s is not a valid option set for DRBD" |
659 |
" barriers" % disabled_barriers)
|
660 |
|
661 |
args = [] |
662 |
|
663 |
# The following code assumes DRBD 8.x, with x < 4 and x != 1 (DRBD 8.1.x
|
664 |
# does not exist)
|
665 |
if not vmaj == 8 and vmin in (0, 2, 3): |
666 |
raise errors.BlockDeviceError("Unsupported DRBD version: %d.%d.%d" % |
667 |
(vmaj, vmin, vrel)) |
668 |
|
669 |
def _AppendOrRaise(option, min_version): |
670 |
"""Helper for DRBD options"""
|
671 |
if min_version is not None and vrel >= min_version: |
672 |
args.append(option) |
673 |
else:
|
674 |
raise errors.BlockDeviceError("Could not use the option %s as the" |
675 |
" DRBD version %d.%d.%d does not support"
|
676 |
" it." % (option, vmaj, vmin, vrel))
|
677 |
|
678 |
# the minimum version for each feature is encoded via pairs of (minor
|
679 |
# version -> x) where x is version in which support for the option was
|
680 |
# introduced.
|
681 |
meta_flush_supported = disk_flush_supported = { |
682 |
0: 12, |
683 |
2: 7, |
684 |
3: 0, |
685 |
} |
686 |
|
687 |
disk_drain_supported = { |
688 |
2: 7, |
689 |
3: 0, |
690 |
} |
691 |
|
692 |
disk_barriers_supported = { |
693 |
3: 0, |
694 |
} |
695 |
|
696 |
# meta flushes
|
697 |
if disable_meta_flush:
|
698 |
_AppendOrRaise(cls._DISABLE_META_FLUSH_OPTION, |
699 |
meta_flush_supported.get(vmin, None))
|
700 |
|
701 |
# disk flushes
|
702 |
if constants.DRBD_B_DISK_FLUSH in disabled_barriers_set: |
703 |
_AppendOrRaise(cls._DISABLE_FLUSH_OPTION, |
704 |
disk_flush_supported.get(vmin, None))
|
705 |
|
706 |
# disk drain
|
707 |
if constants.DRBD_B_DISK_DRAIN in disabled_barriers_set: |
708 |
_AppendOrRaise(cls._DISABLE_DRAIN_OPTION, |
709 |
disk_drain_supported.get(vmin, None))
|
710 |
|
711 |
# disk barriers
|
712 |
if constants.DRBD_B_DISK_BARRIERS in disabled_barriers_set: |
713 |
_AppendOrRaise(cls._DISABLE_DISK_OPTION, |
714 |
disk_barriers_supported.get(vmin, None))
|
715 |
|
716 |
return args
|
717 |
|
718 |
def _AssembleNet(self, minor, net_info, protocol, |
719 |
dual_pri=False, hmac=None, secret=None): |
720 |
"""Configure the network part of the device.
|
721 |
|
722 |
"""
|
723 |
lhost, lport, rhost, rport = net_info |
724 |
if None in net_info: |
725 |
# we don't want network connection and actually want to make
|
726 |
# sure its shutdown
|
727 |
self._ShutdownNet(minor)
|
728 |
return
|
729 |
|
730 |
# Workaround for a race condition. When DRBD is doing its dance to
|
731 |
# establish a connection with its peer, it also sends the
|
732 |
# synchronization speed over the wire. In some cases setting the
|
733 |
# sync speed only after setting up both sides can race with DRBD
|
734 |
# connecting, hence we set it here before telling DRBD anything
|
735 |
# about its peer.
|
736 |
sync_errors = self._SetMinorSyncParams(minor, self.params) |
737 |
if sync_errors:
|
738 |
base.ThrowError("drbd%d: can't set the synchronization parameters: %s" %
|
739 |
(minor, utils.CommaJoin(sync_errors))) |
740 |
|
741 |
if netutils.IP6Address.IsValid(lhost):
|
742 |
if not netutils.IP6Address.IsValid(rhost): |
743 |
base.ThrowError("drbd%d: can't connect ip %s to ip %s" %
|
744 |
(minor, lhost, rhost)) |
745 |
family = "ipv6"
|
746 |
elif netutils.IP4Address.IsValid(lhost):
|
747 |
if not netutils.IP4Address.IsValid(rhost): |
748 |
base.ThrowError("drbd%d: can't connect ip %s to ip %s" %
|
749 |
(minor, lhost, rhost)) |
750 |
family = "ipv4"
|
751 |
else:
|
752 |
base.ThrowError("drbd%d: Invalid ip %s" % (minor, lhost))
|
753 |
|
754 |
args = ["drbdsetup", self._DevPath(minor), "net", |
755 |
"%s:%s:%s" % (family, lhost, lport),
|
756 |
"%s:%s:%s" % (family, rhost, rport), protocol,
|
757 |
"-A", "discard-zero-changes", |
758 |
"-B", "consensus", |
759 |
"--create-device",
|
760 |
] |
761 |
if dual_pri:
|
762 |
args.append("-m")
|
763 |
if hmac and secret: |
764 |
args.extend(["-a", hmac, "-x", secret]) |
765 |
|
766 |
if self.params[constants.LDP_NET_CUSTOM]: |
767 |
args.extend(shlex.split(self.params[constants.LDP_NET_CUSTOM]))
|
768 |
|
769 |
result = utils.RunCmd(args) |
770 |
if result.failed:
|
771 |
base.ThrowError("drbd%d: can't setup network: %s - %s",
|
772 |
minor, result.fail_reason, result.output) |
773 |
|
774 |
def _CheckNetworkConfig(): |
775 |
info = self._GetDevInfo(self._GetShowData(minor)) |
776 |
if not "local_addr" in info or not "remote_addr" in info: |
777 |
raise utils.RetryAgain()
|
778 |
|
779 |
if (info["local_addr"] != (lhost, lport) or |
780 |
info["remote_addr"] != (rhost, rport)):
|
781 |
raise utils.RetryAgain()
|
782 |
|
783 |
try:
|
784 |
utils.Retry(_CheckNetworkConfig, 1.0, 10.0) |
785 |
except utils.RetryTimeout:
|
786 |
base.ThrowError("drbd%d: timeout while configuring network", minor)
|
787 |
|
788 |
def AddChildren(self, devices): |
789 |
"""Add a disk to the DRBD device.
|
790 |
|
791 |
"""
|
792 |
if self.minor is None: |
793 |
base.ThrowError("drbd%d: can't attach to dbrd8 during AddChildren",
|
794 |
self._aminor)
|
795 |
if len(devices) != 2: |
796 |
base.ThrowError("drbd%d: need two devices for AddChildren", self.minor) |
797 |
info = self._GetDevInfo(self._GetShowData(self.minor)) |
798 |
if "local_dev" in info: |
799 |
base.ThrowError("drbd%d: already attached to a local disk", self.minor) |
800 |
backend, meta = devices |
801 |
if backend.dev_path is None or meta.dev_path is None: |
802 |
base.ThrowError("drbd%d: children not ready during AddChildren",
|
803 |
self.minor)
|
804 |
backend.Open() |
805 |
meta.Open() |
806 |
self._CheckMetaSize(meta.dev_path)
|
807 |
self._InitMeta(self._FindUnusedMinor(), meta.dev_path) |
808 |
|
809 |
self._AssembleLocal(self.minor, backend.dev_path, meta.dev_path, self.size) |
810 |
self._children = devices
|
811 |
|
812 |
def RemoveChildren(self, devices): |
813 |
"""Detach the drbd device from local storage.
|
814 |
|
815 |
"""
|
816 |
if self.minor is None: |
817 |
base.ThrowError("drbd%d: can't attach to drbd8 during RemoveChildren",
|
818 |
self._aminor)
|
819 |
# early return if we don't actually have backing storage
|
820 |
info = self._GetDevInfo(self._GetShowData(self.minor)) |
821 |
if "local_dev" not in info: |
822 |
return
|
823 |
if len(self._children) != 2: |
824 |
base.ThrowError("drbd%d: we don't have two children: %s", self.minor, |
825 |
self._children)
|
826 |
if self._children.count(None) == 2: # we don't actually have children :) |
827 |
logging.warning("drbd%d: requested detach while detached", self.minor) |
828 |
return
|
829 |
if len(devices) != 2: |
830 |
base.ThrowError("drbd%d: we need two children in RemoveChildren",
|
831 |
self.minor)
|
832 |
for child, dev in zip(self._children, devices): |
833 |
if dev != child.dev_path:
|
834 |
base.ThrowError("drbd%d: mismatch in local storage (%s != %s) in"
|
835 |
" RemoveChildren", self.minor, dev, child.dev_path) |
836 |
|
837 |
self._ShutdownLocal(self.minor) |
838 |
self._children = []
|
839 |
|
840 |
@classmethod
|
841 |
def _SetMinorSyncParams(cls, minor, params): |
842 |
"""Set the parameters of the DRBD syncer.
|
843 |
|
844 |
This is the low-level implementation.
|
845 |
|
846 |
@type minor: int
|
847 |
@param minor: the drbd minor whose settings we change
|
848 |
@type params: dict
|
849 |
@param params: LD level disk parameters related to the synchronization
|
850 |
@rtype: list
|
851 |
@return: a list of error messages
|
852 |
|
853 |
"""
|
854 |
|
855 |
args = ["drbdsetup", cls._DevPath(minor), "syncer"] |
856 |
if params[constants.LDP_DYNAMIC_RESYNC]:
|
857 |
version = cls._GetVersion(cls._GetProcData()) |
858 |
vmin = version["k_minor"]
|
859 |
vrel = version["k_point"]
|
860 |
|
861 |
# By definition we are using 8.x, so just check the rest of the version
|
862 |
# number
|
863 |
if vmin != 3 or vrel < 9: |
864 |
msg = ("The current DRBD version (8.%d.%d) does not support the "
|
865 |
"dynamic resync speed controller" % (vmin, vrel))
|
866 |
logging.error(msg) |
867 |
return [msg]
|
868 |
|
869 |
if params[constants.LDP_PLAN_AHEAD] == 0: |
870 |
msg = ("A value of 0 for c-plan-ahead disables the dynamic sync speed"
|
871 |
" controller at DRBD level. If you want to disable it, please"
|
872 |
" set the dynamic-resync disk parameter to False.")
|
873 |
logging.error(msg) |
874 |
return [msg]
|
875 |
|
876 |
# add the c-* parameters to args
|
877 |
args.extend(["--c-plan-ahead", params[constants.LDP_PLAN_AHEAD],
|
878 |
"--c-fill-target", params[constants.LDP_FILL_TARGET],
|
879 |
"--c-delay-target", params[constants.LDP_DELAY_TARGET],
|
880 |
"--c-max-rate", params[constants.LDP_MAX_RATE],
|
881 |
"--c-min-rate", params[constants.LDP_MIN_RATE],
|
882 |
]) |
883 |
|
884 |
else:
|
885 |
args.extend(["-r", "%d" % params[constants.LDP_RESYNC_RATE]]) |
886 |
|
887 |
args.append("--create-device")
|
888 |
result = utils.RunCmd(args) |
889 |
if result.failed:
|
890 |
msg = ("Can't change syncer rate: %s - %s" %
|
891 |
(result.fail_reason, result.output)) |
892 |
logging.error(msg) |
893 |
return [msg]
|
894 |
|
895 |
return []
|
896 |
|
897 |
def SetSyncParams(self, params): |
898 |
"""Set the synchronization parameters of the DRBD syncer.
|
899 |
|
900 |
@type params: dict
|
901 |
@param params: LD level disk parameters related to the synchronization
|
902 |
@rtype: list
|
903 |
@return: a list of error messages, emitted both by the current node and by
|
904 |
children. An empty list means no errors
|
905 |
|
906 |
"""
|
907 |
if self.minor is None: |
908 |
err = "Not attached during SetSyncParams"
|
909 |
logging.info(err) |
910 |
return [err]
|
911 |
|
912 |
children_result = super(DRBD8, self).SetSyncParams(params) |
913 |
children_result.extend(self._SetMinorSyncParams(self.minor, params)) |
914 |
return children_result
|
915 |
|
916 |
def PauseResumeSync(self, pause): |
917 |
"""Pauses or resumes the sync of a DRBD device.
|
918 |
|
919 |
@param pause: Wether to pause or resume
|
920 |
@return: the success of the operation
|
921 |
|
922 |
"""
|
923 |
if self.minor is None: |
924 |
logging.info("Not attached during PauseSync")
|
925 |
return False |
926 |
|
927 |
children_result = super(DRBD8, self).PauseResumeSync(pause) |
928 |
|
929 |
if pause:
|
930 |
cmd = "pause-sync"
|
931 |
else:
|
932 |
cmd = "resume-sync"
|
933 |
|
934 |
result = utils.RunCmd(["drbdsetup", self.dev_path, cmd]) |
935 |
if result.failed:
|
936 |
logging.error("Can't %s: %s - %s", cmd,
|
937 |
result.fail_reason, result.output) |
938 |
return not result.failed and children_result |
939 |
|
940 |
def GetProcStatus(self): |
941 |
"""Return device data from /proc.
|
942 |
|
943 |
"""
|
944 |
if self.minor is None: |
945 |
base.ThrowError("drbd%d: GetStats() called while not attached",
|
946 |
self._aminor)
|
947 |
proc_info = self._JoinProcDataPerMinor(self._GetProcData()) |
948 |
if self.minor not in proc_info: |
949 |
base.ThrowError("drbd%d: can't find myself in /proc", self.minor) |
950 |
return DRBD8Status(proc_info[self.minor]) |
951 |
|
952 |
def GetSyncStatus(self): |
953 |
"""Returns the sync status of the device.
|
954 |
|
955 |
|
956 |
If sync_percent is None, it means all is ok
|
957 |
If estimated_time is None, it means we can't estimate
|
958 |
the time needed, otherwise it's the time left in seconds.
|
959 |
|
960 |
|
961 |
We set the is_degraded parameter to True on two conditions:
|
962 |
network not connected or local disk missing.
|
963 |
|
964 |
We compute the ldisk parameter based on whether we have a local
|
965 |
disk or not.
|
966 |
|
967 |
@rtype: objects.BlockDevStatus
|
968 |
|
969 |
"""
|
970 |
if self.minor is None and not self.Attach(): |
971 |
base.ThrowError("drbd%d: can't Attach() in GetSyncStatus", self._aminor) |
972 |
|
973 |
stats = self.GetProcStatus()
|
974 |
is_degraded = not stats.is_connected or not stats.is_disk_uptodate |
975 |
|
976 |
if stats.is_disk_uptodate:
|
977 |
ldisk_status = constants.LDS_OKAY |
978 |
elif stats.is_diskless:
|
979 |
ldisk_status = constants.LDS_FAULTY |
980 |
else:
|
981 |
ldisk_status = constants.LDS_UNKNOWN |
982 |
|
983 |
return objects.BlockDevStatus(dev_path=self.dev_path, |
984 |
major=self.major,
|
985 |
minor=self.minor,
|
986 |
sync_percent=stats.sync_percent, |
987 |
estimated_time=stats.est_time, |
988 |
is_degraded=is_degraded, |
989 |
ldisk_status=ldisk_status) |
990 |
|
991 |
def Open(self, force=False): |
992 |
"""Make the local state primary.
|
993 |
|
994 |
If the 'force' parameter is given, the '-o' option is passed to
|
995 |
drbdsetup. Since this is a potentially dangerous operation, the
|
996 |
force flag should be only given after creation, when it actually
|
997 |
is mandatory.
|
998 |
|
999 |
"""
|
1000 |
if self.minor is None and not self.Attach(): |
1001 |
logging.error("DRBD cannot attach to a device during open")
|
1002 |
return False |
1003 |
cmd = ["drbdsetup", self.dev_path, "primary"] |
1004 |
if force:
|
1005 |
cmd.append("-o")
|
1006 |
result = utils.RunCmd(cmd) |
1007 |
if result.failed:
|
1008 |
base.ThrowError("drbd%d: can't make drbd device primary: %s", self.minor, |
1009 |
result.output) |
1010 |
|
1011 |
def Close(self): |
1012 |
"""Make the local state secondary.
|
1013 |
|
1014 |
This will, of course, fail if the device is in use.
|
1015 |
|
1016 |
"""
|
1017 |
if self.minor is None and not self.Attach(): |
1018 |
base.ThrowError("drbd%d: can't Attach() in Close()", self._aminor) |
1019 |
result = utils.RunCmd(["drbdsetup", self.dev_path, "secondary"]) |
1020 |
if result.failed:
|
1021 |
base.ThrowError("drbd%d: can't switch drbd device to secondary: %s",
|
1022 |
self.minor, result.output)
|
1023 |
|
1024 |
def DisconnectNet(self): |
1025 |
"""Removes network configuration.
|
1026 |
|
1027 |
This method shutdowns the network side of the device.
|
1028 |
|
1029 |
The method will wait up to a hardcoded timeout for the device to
|
1030 |
go into standalone after the 'disconnect' command before
|
1031 |
re-configuring it, as sometimes it takes a while for the
|
1032 |
disconnect to actually propagate and thus we might issue a 'net'
|
1033 |
command while the device is still connected. If the device will
|
1034 |
still be attached to the network and we time out, we raise an
|
1035 |
exception.
|
1036 |
|
1037 |
"""
|
1038 |
if self.minor is None: |
1039 |
base.ThrowError("drbd%d: disk not attached in re-attach net",
|
1040 |
self._aminor)
|
1041 |
|
1042 |
if None in (self._lhost, self._lport, self._rhost, self._rport): |
1043 |
base.ThrowError("drbd%d: DRBD disk missing network info in"
|
1044 |
" DisconnectNet()", self.minor) |
1045 |
|
1046 |
class _DisconnectStatus: |
1047 |
def __init__(self, ever_disconnected): |
1048 |
self.ever_disconnected = ever_disconnected
|
1049 |
|
1050 |
dstatus = _DisconnectStatus(base.IgnoreError(self._ShutdownNet, self.minor)) |
1051 |
|
1052 |
def _WaitForDisconnect(): |
1053 |
if self.GetProcStatus().is_standalone: |
1054 |
return
|
1055 |
|
1056 |
# retry the disconnect, it seems possible that due to a well-time
|
1057 |
# disconnect on the peer, my disconnect command might be ignored and
|
1058 |
# forgotten
|
1059 |
dstatus.ever_disconnected = \ |
1060 |
base.IgnoreError(self._ShutdownNet, self.minor) or \ |
1061 |
dstatus.ever_disconnected |
1062 |
|
1063 |
raise utils.RetryAgain()
|
1064 |
|
1065 |
# Keep start time
|
1066 |
start_time = time.time() |
1067 |
|
1068 |
try:
|
1069 |
# Start delay at 100 milliseconds and grow up to 2 seconds
|
1070 |
utils.Retry(_WaitForDisconnect, (0.1, 1.5, 2.0), |
1071 |
self._NET_RECONFIG_TIMEOUT)
|
1072 |
except utils.RetryTimeout:
|
1073 |
if dstatus.ever_disconnected:
|
1074 |
msg = ("drbd%d: device did not react to the"
|
1075 |
" 'disconnect' command in a timely manner")
|
1076 |
else:
|
1077 |
msg = "drbd%d: can't shutdown network, even after multiple retries"
|
1078 |
|
1079 |
base.ThrowError(msg, self.minor)
|
1080 |
|
1081 |
reconfig_time = time.time() - start_time |
1082 |
if reconfig_time > (self._NET_RECONFIG_TIMEOUT * 0.25): |
1083 |
logging.info("drbd%d: DisconnectNet: detach took %.3f seconds",
|
1084 |
self.minor, reconfig_time)
|
1085 |
|
1086 |
def AttachNet(self, multimaster): |
1087 |
"""Reconnects the network.
|
1088 |
|
1089 |
This method connects the network side of the device with a
|
1090 |
specified multi-master flag. The device needs to be 'Standalone'
|
1091 |
but have valid network configuration data.
|
1092 |
|
1093 |
Args:
|
1094 |
- multimaster: init the network in dual-primary mode
|
1095 |
|
1096 |
"""
|
1097 |
if self.minor is None: |
1098 |
base.ThrowError("drbd%d: device not attached in AttachNet", self._aminor) |
1099 |
|
1100 |
if None in (self._lhost, self._lport, self._rhost, self._rport): |
1101 |
base.ThrowError("drbd%d: missing network info in AttachNet()", self.minor) |
1102 |
|
1103 |
status = self.GetProcStatus()
|
1104 |
|
1105 |
if not status.is_standalone: |
1106 |
base.ThrowError("drbd%d: device is not standalone in AttachNet",
|
1107 |
self.minor)
|
1108 |
|
1109 |
self._AssembleNet(self.minor, |
1110 |
(self._lhost, self._lport, self._rhost, self._rport), |
1111 |
constants.DRBD_NET_PROTOCOL, dual_pri=multimaster, |
1112 |
hmac=constants.DRBD_HMAC_ALG, secret=self._secret)
|
1113 |
|
1114 |
def Attach(self): |
1115 |
"""Check if our minor is configured.
|
1116 |
|
1117 |
This doesn't do any device configurations - it only checks if the
|
1118 |
minor is in a state different from Unconfigured.
|
1119 |
|
1120 |
Note that this function will not change the state of the system in
|
1121 |
any way (except in case of side-effects caused by reading from
|
1122 |
/proc).
|
1123 |
|
1124 |
"""
|
1125 |
used_devs = self.GetUsedDevs()
|
1126 |
if self._aminor in used_devs: |
1127 |
minor = self._aminor
|
1128 |
else:
|
1129 |
minor = None
|
1130 |
|
1131 |
self._SetFromMinor(minor)
|
1132 |
return minor is not None |
1133 |
|
1134 |
def Assemble(self): |
1135 |
"""Assemble the drbd.
|
1136 |
|
1137 |
Method:
|
1138 |
- if we have a configured device, we try to ensure that it matches
|
1139 |
our config
|
1140 |
- if not, we create it from zero
|
1141 |
- anyway, set the device parameters
|
1142 |
|
1143 |
"""
|
1144 |
super(DRBD8, self).Assemble() |
1145 |
|
1146 |
self.Attach()
|
1147 |
if self.minor is None: |
1148 |
# local device completely unconfigured
|
1149 |
self._FastAssemble()
|
1150 |
else:
|
1151 |
# we have to recheck the local and network status and try to fix
|
1152 |
# the device
|
1153 |
self._SlowAssemble()
|
1154 |
|
1155 |
sync_errors = self.SetSyncParams(self.params) |
1156 |
if sync_errors:
|
1157 |
base.ThrowError("drbd%d: can't set the synchronization parameters: %s" %
|
1158 |
(self.minor, utils.CommaJoin(sync_errors)))
|
1159 |
|
1160 |
def _SlowAssemble(self): |
1161 |
"""Assembles the DRBD device from a (partially) configured device.
|
1162 |
|
1163 |
In case of partially attached (local device matches but no network
|
1164 |
setup), we perform the network attach. If successful, we re-test
|
1165 |
the attach if can return success.
|
1166 |
|
1167 |
"""
|
1168 |
# TODO: Rewrite to not use a for loop just because there is 'break'
|
1169 |
# pylint: disable=W0631
|
1170 |
net_data = (self._lhost, self._lport, self._rhost, self._rport) |
1171 |
for minor in (self._aminor,): |
1172 |
info = self._GetDevInfo(self._GetShowData(minor)) |
1173 |
match_l = self._MatchesLocal(info)
|
1174 |
match_r = self._MatchesNet(info)
|
1175 |
|
1176 |
if match_l and match_r: |
1177 |
# everything matches
|
1178 |
break
|
1179 |
|
1180 |
if match_l and not match_r and "local_addr" not in info: |
1181 |
# disk matches, but not attached to network, attach and recheck
|
1182 |
self._AssembleNet(minor, net_data, constants.DRBD_NET_PROTOCOL,
|
1183 |
hmac=constants.DRBD_HMAC_ALG, secret=self._secret)
|
1184 |
if self._MatchesNet(self._GetDevInfo(self._GetShowData(minor))): |
1185 |
break
|
1186 |
else:
|
1187 |
base.ThrowError("drbd%d: network attach successful, but 'drbdsetup"
|
1188 |
" show' disagrees", minor)
|
1189 |
|
1190 |
if match_r and "local_dev" not in info: |
1191 |
# no local disk, but network attached and it matches
|
1192 |
self._AssembleLocal(minor, self._children[0].dev_path, |
1193 |
self._children[1].dev_path, self.size) |
1194 |
if self._MatchesNet(self._GetDevInfo(self._GetShowData(minor))): |
1195 |
break
|
1196 |
else:
|
1197 |
base.ThrowError("drbd%d: disk attach successful, but 'drbdsetup"
|
1198 |
" show' disagrees", minor)
|
1199 |
|
1200 |
# this case must be considered only if we actually have local
|
1201 |
# storage, i.e. not in diskless mode, because all diskless
|
1202 |
# devices are equal from the point of view of local
|
1203 |
# configuration
|
1204 |
if (match_l and "local_dev" in info and |
1205 |
not match_r and "local_addr" in info): |
1206 |
# strange case - the device network part points to somewhere
|
1207 |
# else, even though its local storage is ours; as we own the
|
1208 |
# drbd space, we try to disconnect from the remote peer and
|
1209 |
# reconnect to our correct one
|
1210 |
try:
|
1211 |
self._ShutdownNet(minor)
|
1212 |
except errors.BlockDeviceError, err:
|
1213 |
base.ThrowError("drbd%d: device has correct local storage, wrong"
|
1214 |
" remote peer and is unable to disconnect in order"
|
1215 |
" to attach to the correct peer: %s", minor, str(err)) |
1216 |
# note: _AssembleNet also handles the case when we don't want
|
1217 |
# local storage (i.e. one or more of the _[lr](host|port) is
|
1218 |
# None)
|
1219 |
self._AssembleNet(minor, net_data, constants.DRBD_NET_PROTOCOL,
|
1220 |
hmac=constants.DRBD_HMAC_ALG, secret=self._secret)
|
1221 |
if self._MatchesNet(self._GetDevInfo(self._GetShowData(minor))): |
1222 |
break
|
1223 |
else:
|
1224 |
base.ThrowError("drbd%d: network attach successful, but 'drbdsetup"
|
1225 |
" show' disagrees", minor)
|
1226 |
|
1227 |
else:
|
1228 |
minor = None
|
1229 |
|
1230 |
self._SetFromMinor(minor)
|
1231 |
if minor is None: |
1232 |
base.ThrowError("drbd%d: cannot activate, unknown or unhandled reason",
|
1233 |
self._aminor)
|
1234 |
|
1235 |
def _FastAssemble(self): |
1236 |
"""Assemble the drbd device from zero.
|
1237 |
|
1238 |
This is run when in Assemble we detect our minor is unused.
|
1239 |
|
1240 |
"""
|
1241 |
minor = self._aminor
|
1242 |
if self._children and self._children[0] and self._children[1]: |
1243 |
self._AssembleLocal(minor, self._children[0].dev_path, |
1244 |
self._children[1].dev_path, self.size) |
1245 |
if self._lhost and self._lport and self._rhost and self._rport: |
1246 |
self._AssembleNet(minor,
|
1247 |
(self._lhost, self._lport, self._rhost, self._rport), |
1248 |
constants.DRBD_NET_PROTOCOL, |
1249 |
hmac=constants.DRBD_HMAC_ALG, secret=self._secret)
|
1250 |
self._SetFromMinor(minor)
|
1251 |
|
1252 |
@classmethod
|
1253 |
def _ShutdownLocal(cls, minor): |
1254 |
"""Detach from the local device.
|
1255 |
|
1256 |
I/Os will continue to be served from the remote device. If we
|
1257 |
don't have a remote device, this operation will fail.
|
1258 |
|
1259 |
"""
|
1260 |
result = utils.RunCmd(["drbdsetup", cls._DevPath(minor), "detach"]) |
1261 |
if result.failed:
|
1262 |
base.ThrowError("drbd%d: can't detach local disk: %s",
|
1263 |
minor, result.output) |
1264 |
|
1265 |
@classmethod
|
1266 |
def _ShutdownNet(cls, minor): |
1267 |
"""Disconnect from the remote peer.
|
1268 |
|
1269 |
This fails if we don't have a local device.
|
1270 |
|
1271 |
"""
|
1272 |
result = utils.RunCmd(["drbdsetup", cls._DevPath(minor), "disconnect"]) |
1273 |
if result.failed:
|
1274 |
base.ThrowError("drbd%d: can't shutdown network: %s",
|
1275 |
minor, result.output) |
1276 |
|
1277 |
@classmethod
|
1278 |
def _ShutdownAll(cls, minor): |
1279 |
"""Deactivate the device.
|
1280 |
|
1281 |
This will, of course, fail if the device is in use.
|
1282 |
|
1283 |
"""
|
1284 |
result = utils.RunCmd(["drbdsetup", cls._DevPath(minor), "down"]) |
1285 |
if result.failed:
|
1286 |
base.ThrowError("drbd%d: can't shutdown drbd device: %s",
|
1287 |
minor, result.output) |
1288 |
|
1289 |
def Shutdown(self): |
1290 |
"""Shutdown the DRBD device.
|
1291 |
|
1292 |
"""
|
1293 |
if self.minor is None and not self.Attach(): |
1294 |
logging.info("drbd%d: not attached during Shutdown()", self._aminor) |
1295 |
return
|
1296 |
minor = self.minor
|
1297 |
self.minor = None |
1298 |
self.dev_path = None |
1299 |
self._ShutdownAll(minor)
|
1300 |
|
1301 |
def Remove(self): |
1302 |
"""Stub remove for DRBD devices.
|
1303 |
|
1304 |
"""
|
1305 |
self.Shutdown()
|
1306 |
|
1307 |
@classmethod
|
1308 |
def Create(cls, unique_id, children, size, params, excl_stor): |
1309 |
"""Create a new DRBD8 device.
|
1310 |
|
1311 |
Since DRBD devices are not created per se, just assembled, this
|
1312 |
function only initializes the metadata.
|
1313 |
|
1314 |
"""
|
1315 |
if len(children) != 2: |
1316 |
raise errors.ProgrammerError("Invalid setup for the drbd device") |
1317 |
if excl_stor:
|
1318 |
raise errors.ProgrammerError("DRBD device requested with" |
1319 |
" exclusive_storage")
|
1320 |
# check that the minor is unused
|
1321 |
aminor = unique_id[4]
|
1322 |
proc_info = cls._JoinProcDataPerMinor(cls._GetProcData()) |
1323 |
if aminor in proc_info: |
1324 |
status = DRBD8Status(proc_info[aminor]) |
1325 |
in_use = status.is_in_use |
1326 |
else:
|
1327 |
in_use = False
|
1328 |
if in_use:
|
1329 |
base.ThrowError("drbd%d: minor is already in use at Create() time",
|
1330 |
aminor) |
1331 |
meta = children[1]
|
1332 |
meta.Assemble() |
1333 |
if not meta.Attach(): |
1334 |
base.ThrowError("drbd%d: can't attach to meta device '%s'",
|
1335 |
aminor, meta) |
1336 |
cls._CheckMetaSize(meta.dev_path) |
1337 |
cls._InitMeta(aminor, meta.dev_path) |
1338 |
return cls(unique_id, children, size, params)
|
1339 |
|
1340 |
def Grow(self, amount, dryrun, backingstore): |
1341 |
"""Resize the DRBD device and its backing storage.
|
1342 |
|
1343 |
"""
|
1344 |
if self.minor is None: |
1345 |
base.ThrowError("drbd%d: Grow called while not attached", self._aminor) |
1346 |
if len(self._children) != 2 or None in self._children: |
1347 |
base.ThrowError("drbd%d: cannot grow diskless device", self.minor) |
1348 |
self._children[0].Grow(amount, dryrun, backingstore) |
1349 |
if dryrun or backingstore: |
1350 |
# DRBD does not support dry-run mode and is not backing storage,
|
1351 |
# so we'll return here
|
1352 |
return
|
1353 |
result = utils.RunCmd(["drbdsetup", self.dev_path, "resize", "-s", |
1354 |
"%dm" % (self.size + amount)]) |
1355 |
if result.failed:
|
1356 |
base.ThrowError("drbd%d: resize failed: %s", self.minor, result.output) |
1357 |
|
1358 |
|
1359 |
def _CanReadDevice(path): |
1360 |
"""Check if we can read from the given device.
|
1361 |
|
1362 |
This tries to read the first 128k of the device.
|
1363 |
|
1364 |
"""
|
1365 |
try:
|
1366 |
utils.ReadFile(path, size=_DEVICE_READ_SIZE) |
1367 |
return True |
1368 |
except EnvironmentError: |
1369 |
logging.warning("Can't read from device %s", path, exc_info=True) |
1370 |
return False |