#
#
-# Copyright (C) 2006, 2007 Google Inc.
+# Copyright (C) 2006, 2007, 2010, 2011 Google Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
import re
import time
import errno
+import stat
import pyparsing as pyp
import os
import logging
from ganeti import utils
from ganeti import errors
from ganeti import constants
+from ganeti import objects
+from ganeti import compat
+from ganeti import netutils
+
+
+# Size of reads in _CanReadDevice
+_DEVICE_READ_SIZE = 128 * 1024
def _IgnoreError(fn, *args, **kwargs):
fn(*args, **kwargs)
return True
except errors.BlockDeviceError, err:
- logging.warning("Caught BlockDeviceError but ignoring: %s" % str(err))
+ logging.warning("Caught BlockDeviceError but ignoring: %s", str(err))
return False
raise errors.BlockDeviceError(msg)
+def _CanReadDevice(path):
+ """Check if we can read from the given device.
+
+ This tries to read the first 128k of the device.
+
+ """
+ try:
+ utils.ReadFile(path, size=_DEVICE_READ_SIZE)
+ return True
+ except EnvironmentError:
+ logging.warning("Can't read from device %s", path, exc_info=True)
+ return False
+
+
class BlockDev(object):
"""Block device abstract class.
"""Remove this device.
This makes sense only for some of the device types: LV and file
- storeage. Also note that if the device can't attach, the removal
+ storage. Also note that if the device can't attach, the removal
can't be completed.
"""
result = result and child.SetSyncSpeed(speed)
return result
+ def PauseResumeSync(self, pause):
+ """Pause/Resume the sync of the mirror.
+
+ In case this is not a mirroring device, this is no-op.
+
+ @param pause: Wheater to pause or resume
+
+ """
+ result = True
+ if self._children:
+ for child in self._children:
+ result = result and child.PauseResumeSync(pause)
+ return result
+
def GetSyncStatus(self):
"""Returns the sync status of the device.
data. This is only valid for some devices, the rest will always
return False (not degraded).
- @rtype: tuple
- @return: (sync_percent, estimated_time, is_degraded, ldisk)
+ @rtype: objects.BlockDevStatus
"""
- return None, None, False, False
-
+ return objects.BlockDevStatus(dev_path=self.dev_path,
+ major=self.major,
+ minor=self.minor,
+ sync_percent=None,
+ estimated_time=None,
+ is_degraded=False,
+ ldisk_status=constants.LDS_OKAY)
def CombinedSyncStatus(self):
"""Calculate the mirror status recursively for our children.
minimum percent and maximum time are calculated across our
children.
+ @rtype: objects.BlockDevStatus
+
"""
- min_percent, max_time, is_degraded, ldisk = self.GetSyncStatus()
+ status = self.GetSyncStatus()
+
+ min_percent = status.sync_percent
+ max_time = status.estimated_time
+ is_degraded = status.is_degraded
+ ldisk_status = status.ldisk_status
+
if self._children:
for child in self._children:
- c_percent, c_time, c_degraded, c_ldisk = child.GetSyncStatus()
+ child_status = child.GetSyncStatus()
+
if min_percent is None:
- min_percent = c_percent
- elif c_percent is not None:
- min_percent = min(min_percent, c_percent)
+ min_percent = child_status.sync_percent
+ elif child_status.sync_percent is not None:
+ min_percent = min(min_percent, child_status.sync_percent)
+
if max_time is None:
- max_time = c_time
- elif c_time is not None:
- max_time = max(max_time, c_time)
- is_degraded = is_degraded or c_degraded
- ldisk = ldisk or c_ldisk
- return min_percent, max_time, is_degraded, ldisk
+ max_time = child_status.estimated_time
+ elif child_status.estimated_time is not None:
+ max_time = max(max_time, child_status.estimated_time)
+
+ is_degraded = is_degraded or child_status.is_degraded
+
+ if ldisk_status is None:
+ ldisk_status = child_status.ldisk_status
+ elif child_status.ldisk_status is not None:
+ ldisk_status = max(ldisk_status, child_status.ldisk_status)
+
+ return objects.BlockDevStatus(dev_path=self.dev_path,
+ major=self.major,
+ minor=self.minor,
+ sync_percent=min_percent,
+ estimated_time=max_time,
+ is_degraded=is_degraded,
+ ldisk_status=ldisk_status)
def SetInfo(self, text):
for child in self._children:
child.SetInfo(text)
- def Grow(self, amount):
+ def Grow(self, amount, dryrun):
"""Grow the block device.
+ @type amount: integer
@param amount: the amount (in mebibytes) to grow with
+ @type dryrun: boolean
+ @param dryrun: whether to execute the operation in simulation mode
+ only, without actually increasing the size
"""
raise NotImplementedError
+ def GetActualSize(self):
+ """Return the actual disk size.
+
+ @note: the device needs to be active when this is called
+
+ """
+ assert self.attached, "BlockDevice not attached in GetActualSize()"
+ result = utils.RunCmd(["blockdev", "--getsize64", self.dev_path])
+ if result.failed:
+ _ThrowError("blockdev failed (%s): %s",
+ result.fail_reason, result.output)
+ try:
+ sz = int(result.output.strip())
+ except (ValueError, TypeError), err:
+ _ThrowError("Failed to parse blockdev output: %s", str(err))
+ return sz
+
def __repr__(self):
return ("<%s: unique_id: %s, children: %s, %s:%s, %s>" %
(self.__class__, self.unique_id, self._children,
"""Logical Volume block device.
"""
+ _VALID_NAME_RE = re.compile("^[a-zA-Z0-9+_.-]*$")
+ _INVALID_NAMES = frozenset([".", "..", "snapshot", "pvmove"])
+ _INVALID_SUBSTRINGS = frozenset(["_mlog", "_mimage"])
+
def __init__(self, unique_id, children, size):
"""Attaches to a LV device.
if not isinstance(unique_id, (tuple, list)) or len(unique_id) != 2:
raise ValueError("Invalid configuration data %s" % str(unique_id))
self._vg_name, self._lv_name = unique_id
- self.dev_path = "/dev/%s/%s" % (self._vg_name, self._lv_name)
+ self._ValidateName(self._vg_name)
+ self._ValidateName(self._lv_name)
+ self.dev_path = utils.PathJoin("/dev", self._vg_name, self._lv_name)
self._degraded = True
- self.major = self.minor = None
+ self.major = self.minor = self.pe_size = self.stripe_count = None
self.Attach()
@classmethod
raise errors.ProgrammerError("Invalid configuration data %s" %
str(unique_id))
vg_name, lv_name = unique_id
- pvs_info = cls.GetPVInfo(vg_name)
+ cls._ValidateName(vg_name)
+ cls._ValidateName(lv_name)
+ pvs_info = cls.GetPVInfo([vg_name])
if not pvs_info:
_ThrowError("Can't compute PV info for vg %s", vg_name)
pvs_info.sort()
pvs_info.reverse()
pvlist = [ pv[1] for pv in pvs_info ]
+ if compat.any(":" in v for v in pvlist):
+ _ThrowError("Some of your PVs have the invalid character ':' in their"
+ " name, this is not supported - please filter them out"
+ " in lvm.conf using either 'filter' or 'preferred_names'")
free_size = sum([ pv[0] for pv in pvs_info ])
current_pvs = len(pvlist)
stripes = min(current_pvs, constants.LVM_STRIPECOUNT)
return LogicalVolume(unique_id, children, size)
@staticmethod
- def GetPVInfo(vg_name):
+ def _GetVolumeInfo(lvm_cmd, fields):
+ """Returns LVM Volumen infos using lvm_cmd
+
+ @param lvm_cmd: Should be one of "pvs", "vgs" or "lvs"
+ @param fields: Fields to return
+ @return: A list of dicts each with the parsed fields
+
+ """
+ if not fields:
+ raise errors.ProgrammerError("No fields specified")
+
+ sep = "|"
+ cmd = [lvm_cmd, "--noheadings", "--nosuffix", "--units=m", "--unbuffered",
+ "--separator=%s" % sep, "-o%s" % ",".join(fields)]
+
+ result = utils.RunCmd(cmd)
+ if result.failed:
+ raise errors.CommandError("Can't get the volume information: %s - %s" %
+ (result.fail_reason, result.output))
+
+ data = []
+ for line in result.stdout.splitlines():
+ splitted_fields = line.strip().split(sep)
+
+ if len(fields) != len(splitted_fields):
+ raise errors.CommandError("Can't parse %s output: line '%s'" %
+ (lvm_cmd, line))
+
+ data.append(splitted_fields)
+
+ return data
+
+ @classmethod
+ def GetPVInfo(cls, vg_names, filter_allocatable=True):
"""Get the free space info for PVs in a volume group.
- @param vg_name: the volume group name
+ @param vg_names: list of volume group names, if empty all will be returned
+ @param filter_allocatable: whether to skip over unallocatable PVs
@rtype: list
@return: list of tuples (free_space, name) with free_space in mebibytes
"""
- command = ["pvs", "--noheadings", "--nosuffix", "--units=m",
- "-opv_name,vg_name,pv_free,pv_attr", "--unbuffered",
- "--separator=:"]
- result = utils.RunCmd(command)
- if result.failed:
- logging.error("Can't get the PV information: %s - %s",
- result.fail_reason, result.output)
+ try:
+ info = cls._GetVolumeInfo("pvs", ["pv_name", "vg_name", "pv_free",
+ "pv_attr"])
+ except errors.GenericError, err:
+ logging.error("Can't get PV information: %s", err)
return None
+
data = []
- for line in result.stdout.splitlines():
- fields = line.strip().split(':')
- if len(fields) != 4:
- logging.error("Can't parse pvs output: line '%s'", line)
- return None
- # skip over pvs from another vg or ones which are not allocatable
- if fields[1] != vg_name or fields[3][0] != 'a':
+ for pv_name, vg_name, pv_free, pv_attr in info:
+ # (possibly) skip over pvs which are not allocatable
+ if filter_allocatable and pv_attr[0] != "a":
+ continue
+ # (possibly) skip over pvs which are not in the right volume group(s)
+ if vg_names and vg_name not in vg_names:
continue
- data.append((float(fields[2]), fields[0]))
+ data.append((float(pv_free), pv_name, vg_name))
return data
+ @classmethod
+ def GetVGInfo(cls, vg_names, filter_readonly=True):
+ """Get the free space info for specific VGs.
+
+ @param vg_names: list of volume group names, if empty all will be returned
+ @param filter_readonly: whether to skip over readonly VGs
+
+ @rtype: list
+ @return: list of tuples (free_space, total_size, name) with free_space in
+ MiB
+
+ """
+ try:
+ info = cls._GetVolumeInfo("vgs", ["vg_name", "vg_free", "vg_attr",
+ "vg_size"])
+ except errors.GenericError, err:
+ logging.error("Can't get VG information: %s", err)
+ return None
+
+ data = []
+ for vg_name, vg_free, vg_attr, vg_size in info:
+ # (possibly) skip over vgs which are not writable
+ if filter_readonly and vg_attr[0] == "r":
+ continue
+ # (possibly) skip over vgs which are not in the right volume group(s)
+ if vg_names and vg_name not in vg_names:
+ continue
+ data.append((float(vg_free), float(vg_size), vg_name))
+
+ return data
+
+ @classmethod
+ def _ValidateName(cls, name):
+ """Validates that a given name is valid as VG or LV name.
+
+ The list of valid characters and restricted names is taken out of
+ the lvm(8) manpage, with the simplification that we enforce both
+ VG and LV restrictions on the names.
+
+ """
+ if (not cls._VALID_NAME_RE.match(name) or
+ name in cls._INVALID_NAMES or
+ compat.any(substring in name for substring in cls._INVALID_SUBSTRINGS)):
+ _ThrowError("Invalid LVM name '%s'", name)
+
def Remove(self):
"""Remove this logical volume.
if result.failed:
_ThrowError("Failed to rename the logical volume: %s", result.output)
self._lv_name = new_name
- self.dev_path = "/dev/%s/%s" % (self._vg_name, self._lv_name)
+ self.dev_path = utils.PathJoin("/dev", self._vg_name, self._lv_name)
def Attach(self):
"""Attach to an existing LV.
"""
self.attached = False
result = utils.RunCmd(["lvs", "--noheadings", "--separator=,",
- "-olv_attr,lv_kernel_major,lv_kernel_minor",
- self.dev_path])
+ "--units=m", "--nosuffix",
+ "-olv_attr,lv_kernel_major,lv_kernel_minor,"
+ "vg_extent_size,stripes", self.dev_path])
if result.failed:
logging.error("Can't find LV %s: %s, %s",
self.dev_path, result.fail_reason, result.output)
return False
- out = result.stdout.strip().rstrip(',')
+ # the output can (and will) have multiple lines for multi-segment
+ # LVs, as the 'stripes' parameter is a segment one, so we take
+ # only the last entry, which is the one we're interested in; note
+ # that with LVM2 anyway the 'stripes' value must be constant
+ # across segments, so this is a no-op actually
+ out = result.stdout.splitlines()
+ if not out: # totally empty result? splitlines() returns at least
+ # one line for any non-empty string
+ logging.error("Can't parse LVS output, no lines? Got '%s'", str(out))
+ return False
+ out = out[-1].strip().rstrip(",")
out = out.split(",")
- if len(out) != 3:
- logging.error("Can't parse LVS output, len(%s) != 3", str(out))
+ if len(out) != 5:
+ logging.error("Can't parse LVS output, len(%s) != 5", str(out))
return False
- status, major, minor = out[:3]
+ status, major, minor, pe_size, stripes = out
if len(status) != 6:
logging.error("lvs lv_attr is not 6 characters (%s)", status)
return False
try:
major = int(major)
minor = int(minor)
- except ValueError, err:
+ except (TypeError, ValueError), err:
logging.error("lvs major/minor cannot be parsed: %s", str(err))
+ try:
+ pe_size = int(float(pe_size))
+ except (TypeError, ValueError), err:
+ logging.error("Can't parse vg extent size: %s", err)
+ return False
+
+ try:
+ stripes = int(stripes)
+ except (TypeError, ValueError), err:
+ logging.error("Can't parse the number of stripes: %s", err)
+ return False
+
self.major = major
self.minor = minor
- self._degraded = status[0] == 'v' # virtual volume, i.e. doesn't backing
+ self.pe_size = pe_size
+ self.stripe_count = stripes
+ self._degraded = status[0] == "v" # virtual volume, i.e. doesn't backing
# storage
self.attached = True
return True
def Assemble(self):
"""Assemble the device.
- We alway run `lvchange -ay` on the LV to ensure it's active before
+ We always run `lvchange -ay` on the LV to ensure it's active before
use, as there were cases when xenvg was not active after boot
(also possibly after disk issues).
The status was already read in Attach, so we just return it.
- @rtype: tuple
- @return: (sync_percent, estimated_time, is_degraded, ldisk)
+ @rtype: objects.BlockDevStatus
"""
- return None, None, self._degraded, self._degraded
+ if self._degraded:
+ ldisk_status = constants.LDS_FAULTY
+ else:
+ ldisk_status = constants.LDS_OKAY
+
+ return objects.BlockDevStatus(dev_path=self.dev_path,
+ major=self.major,
+ minor=self.minor,
+ sync_percent=None,
+ estimated_time=None,
+ is_degraded=self._degraded,
+ ldisk_status=ldisk_status)
def Open(self, force=False):
"""Make the device ready for I/O.
def Snapshot(self, size):
"""Create a snapshot copy of an lvm block device.
+ @returns: tuple (vg, lv)
+
"""
snap_name = self._lv_name + ".snap"
snap = LogicalVolume((self._vg_name, snap_name), None, size)
_IgnoreError(snap.Remove)
- pvs_info = self.GetPVInfo(self._vg_name)
- if not pvs_info:
- _ThrowError("Can't compute PV info for vg %s", self._vg_name)
- pvs_info.sort()
- pvs_info.reverse()
- free_size, pv_name = pvs_info[0]
+ vg_info = self.GetVGInfo([self._vg_name])
+ if not vg_info:
+ _ThrowError("Can't compute VG info for vg %s", self._vg_name)
+ free_size, _, _ = vg_info[0]
if free_size < size:
_ThrowError("Not enough free space: required %s,"
" available %s", size, free_size)
_ThrowError("command: %s error: %s - %s",
result.cmd, result.fail_reason, result.output)
- return snap_name
+ return (self._vg_name, snap_name)
def SetInfo(self, text):
"""Update metadata with info text.
BlockDev.SetInfo(self, text)
# Replace invalid characters
- text = re.sub('^[^A-Za-z0-9_+.]', '_', text)
- text = re.sub('[^-A-Za-z0-9_+.]', '_', text)
+ text = re.sub("^[^A-Za-z0-9_+.]", "_", text)
+ text = re.sub("[^-A-Za-z0-9_+.]", "_", text)
# Only up to 128 characters are allowed
text = text[:128]
_ThrowError("Command: %s error: %s - %s", result.cmd, result.fail_reason,
result.output)
- def Grow(self, amount):
+ def Grow(self, amount, dryrun):
"""Grow the logical volume.
"""
+ if self.pe_size is None or self.stripe_count is None:
+ if not self.Attach():
+ _ThrowError("Can't attach to LV during Grow()")
+ full_stripe_size = self.pe_size * self.stripe_count
+ rest = amount % full_stripe_size
+ if rest != 0:
+ amount += full_stripe_size - rest
+ cmd = ["lvextend", "-L", "+%dm" % amount]
+ if dryrun:
+ cmd.append("--test")
# we try multiple algorithms since the 'best' ones might not have
# space available in the right place, but later ones might (since
# they have less constraints); also note that only recent LVM
# supports 'cling'
for alloc_policy in "contiguous", "cling", "normal":
- result = utils.RunCmd(["lvextend", "--alloc", alloc_policy,
- "-L", "+%dm" % amount, self.dev_path])
+ result = utils.RunCmd(cmd + ["--alloc", alloc_policy, self.dev_path])
if not result.failed:
return
_ThrowError("Can't grow LV %s: %s", self.dev_path, result.output)
self.est_time = None
-class BaseDRBD(BlockDev):
+class BaseDRBD(BlockDev): # pylint: disable-msg=W0223
"""Base DRBD class.
This class contains a few bits of common functionality between the
0.7 and 8.x versions of DRBD.
"""
- _VERSION_RE = re.compile(r"^version: (\d+)\.(\d+)\.(\d+)"
+ _VERSION_RE = re.compile(r"^version: (\d+)\.(\d+)\.(\d+)(?:\.\d+)?"
r" \(api:(\d+)/proto:(\d+)(?:-(\d+))?\)")
+ _VALID_LINE_RE = re.compile("^ *([0-9]+): cs:([^ ]+).*$")
+ _UNUSED_LINE_RE = re.compile("^ *([0-9]+): cs:Unconfigured$")
_DRBD_MAJOR = 147
_ST_UNCONFIGURED = "Unconfigured"
_ST_CONNECTED = "Connected"
_STATUS_FILE = "/proc/drbd"
+ _USERMODE_HELPER_FILE = "/sys/module/drbd/parameters/usermode_helper"
@staticmethod
def _GetProcData(filename=_STATUS_FILE):
"""
try:
- stat = open(filename, "r")
- try:
- data = stat.read().splitlines()
- finally:
- stat.close()
+ data = utils.ReadFile(filename).splitlines()
except EnvironmentError, err:
if err.errno == errno.ENOENT:
_ThrowError("The file %s cannot be opened, check if the module"
_ThrowError("Can't read any data from %s", filename)
return data
- @staticmethod
- def _MassageProcData(data):
+ @classmethod
+ def _MassageProcData(cls, data):
"""Transform the output of _GetProdData into a nicer form.
@return: a dictionary of minor: joined lines from /proc/drbd
for that minor
"""
- lmatch = re.compile("^ *([0-9]+):.*$")
results = {}
old_minor = old_line = None
for line in data:
- lresult = lmatch.match(line)
+ if not line: # completely empty lines, as can be returned by drbd8.0+
+ continue
+ lresult = cls._VALID_LINE_RE.match(line)
if lresult is not None:
if old_minor is not None:
results[old_minor] = old_line
return results
@classmethod
- def _GetVersion(cls):
+ def _GetVersion(cls, proc_data):
"""Return the DRBD version.
This will return a dict with keys:
- proto2 (only on drbd > 8.2.X)
"""
- proc_data = cls._GetProcData()
first_line = proc_data[0].strip()
version = cls._VERSION_RE.match(first_line)
if not version:
first_line)
values = version.groups()
- retval = {'k_major': int(values[0]),
- 'k_minor': int(values[1]),
- 'k_point': int(values[2]),
- 'api': int(values[3]),
- 'proto': int(values[4]),
+ retval = {"k_major": int(values[0]),
+ "k_minor": int(values[1]),
+ "k_point": int(values[2]),
+ "api": int(values[3]),
+ "proto": int(values[4]),
}
if values[5] is not None:
- retval['proto2'] = values[5]
+ retval["proto2"] = values[5]
return retval
@staticmethod
+ def GetUsermodeHelper(filename=_USERMODE_HELPER_FILE):
+ """Returns DRBD usermode_helper currently set.
+
+ """
+ try:
+ helper = utils.ReadFile(filename).splitlines()[0]
+ except EnvironmentError, err:
+ if err.errno == errno.ENOENT:
+ _ThrowError("The file %s cannot be opened, check if the module"
+ " is loaded (%s)", filename, str(err))
+ else:
+ _ThrowError("Can't read DRBD helper file %s: %s", filename, str(err))
+ if not helper:
+ _ThrowError("Can't read any data from %s", filename)
+ return helper
+
+ @staticmethod
def _DevPath(minor):
"""Return the path to a drbd device for a given minor.
data = cls._GetProcData()
used_devs = {}
- valid_line = re.compile("^ *([0-9]+): cs:([^ ]+).*$")
for line in data:
- match = valid_line.match(line)
+ match = cls._VALID_LINE_RE.match(line)
if not match:
continue
minor = int(match.group(1))
result.fail_reason, result.output)
try:
sectors = int(result.stdout)
- except ValueError:
+ except (TypeError, ValueError):
_ThrowError("Invalid output from blockdev: '%s'", result.stdout)
- bytes = sectors * 512
- if bytes < 128 * 1024 * 1024: # less than 128MiB
- _ThrowError("Meta device too small (%.2fMib)", (bytes / 1024 / 1024))
+ num_bytes = sectors * 512
+ if num_bytes < 128 * 1024 * 1024: # less than 128MiB
+ _ThrowError("Meta device too small (%.2fMib)", (num_bytes / 1024 / 1024))
# the maximum *valid* size of the meta device when living on top
# of LVM is hard to compute: it depends on the number of stripes
# and the PE size; e.g. a 2-stripe, 64MB PE will result in a 128MB
# (normal size), but an eight-stripe 128MB PE will result in a 1GB
# size meta device; as such, we restrict it to 1GB (a little bit
# too generous, but making assumptions about PE size is hard)
- if bytes > 1024 * 1024 * 1024:
- _ThrowError("Meta device too big (%.2fMiB)", (bytes / 1024 / 1024))
+ if num_bytes > 1024 * 1024 * 1024:
+ _ThrowError("Meta device too big (%.2fMiB)", (num_bytes / 1024 / 1024))
def Rename(self, new_id):
"""Rename a device.
def __init__(self, unique_id, children, size):
if children and children.count(None) > 0:
children = []
- super(DRBD8, self).__init__(unique_id, children, size)
- self.major = self._DRBD_MAJOR
- version = self._GetVersion()
- if version['k_major'] != 8 :
- _ThrowError("Mismatch in DRBD kernel version and requested ganeti"
- " usage: kernel is %s.%s, ganeti wants 8.x",
- version['k_major'], version['k_minor'])
-
if len(children) not in (0, 2):
raise ValueError("Invalid configuration data %s" % str(children))
if not isinstance(unique_id, (tuple, list)) or len(unique_id) != 6:
(self._lhost, self._lport,
self._rhost, self._rport,
self._aminor, self._secret) = unique_id
+ if children:
+ if not _CanReadDevice(children[1].dev_path):
+ logging.info("drbd%s: Ignoring unreadable meta device", self._aminor)
+ children = []
+ super(DRBD8, self).__init__(unique_id, children, size)
+ self.major = self._DRBD_MAJOR
+ version = self._GetVersion(self._GetProcData())
+ if version["k_major"] != 8 :
+ _ThrowError("Mismatch in DRBD kernel version and requested ganeti"
+ " usage: kernel is %s.%s, ganeti wants 8.x",
+ version["k_major"], version["k_minor"])
+
if (self._lhost is not None and self._lhost == self._rhost and
self._lport == self._rport):
raise ValueError("Invalid configuration data, same local/remote %s" %
This will not work if the given minor is in use.
"""
+ # Zero the metadata first, in order to make sure drbdmeta doesn't
+ # try to auto-detect existing filesystems or similar (see
+ # http://code.google.com/p/ganeti/issues/detail?id=182); we only
+ # care about the first 128MB of data in the device, even though it
+ # can be bigger
+ result = utils.RunCmd([constants.DD_CMD,
+ "if=/dev/zero", "of=%s" % dev_path,
+ "bs=1048576", "count=128", "oflag=direct"])
+ if result.failed:
+ _ThrowError("Can't wipe the meta device: %s", result.output)
+
result = utils.RunCmd(["drbdmeta", "--force", cls._DevPath(minor),
"v08", dev_path, "0", "create-md"])
if result.failed:
"""
data = cls._GetProcData()
- unused_line = re.compile("^ *([0-9]+): cs:Unconfigured$")
- used_line = re.compile("^ *([0-9]+): cs:")
highest = None
for line in data:
- match = unused_line.match(line)
+ match = cls._UNUSED_LINE_RE.match(line)
if match:
return int(match.group(1))
- match = used_line.match(line)
+ match = cls._VALID_LINE_RE.match(line)
if match:
minor = int(match.group(1))
highest = max(highest, minor)
# pyparsing setup
lbrace = pyp.Literal("{").suppress()
rbrace = pyp.Literal("}").suppress()
+ lbracket = pyp.Literal("[").suppress()
+ rbracket = pyp.Literal("]").suppress()
semi = pyp.Literal(";").suppress()
+ colon = pyp.Literal(":").suppress()
# this also converts the value to an int
number = pyp.Word(pyp.nums).setParseAction(lambda s, l, t: int(t[0]))
# value types
value = pyp.Word(pyp.alphanums + '_-/.:')
quoted = dbl_quote + pyp.CharsNotIn('"') + dbl_quote
- addr_type = (pyp.Optional(pyp.Literal("ipv4")).suppress() +
- pyp.Optional(pyp.Literal("ipv6")).suppress())
- addr_port = (addr_type + pyp.Word(pyp.nums + '.') +
- pyp.Literal(':').suppress() + number)
+ ipv4_addr = (pyp.Optional(pyp.Literal("ipv4")).suppress() +
+ pyp.Word(pyp.nums + ".") + colon + number)
+ ipv6_addr = (pyp.Optional(pyp.Literal("ipv6")).suppress() +
+ pyp.Optional(lbracket) + pyp.Word(pyp.hexnums + ":") +
+ pyp.Optional(rbracket) + colon + number)
# meta device, extended syntax
- meta_value = ((value ^ quoted) + pyp.Literal('[').suppress() +
- number + pyp.Word(']').suppress())
+ meta_value = ((value ^ quoted) + lbracket + number + rbracket)
# device name, extended syntax
device_value = pyp.Literal("minor").suppress() + number
# a statement
stmt = (~rbrace + keyword + ~lbrace +
- pyp.Optional(addr_port ^ value ^ quoted ^ meta_value ^
+ pyp.Optional(ipv4_addr ^ ipv6_addr ^ value ^ quoted ^ meta_value ^
device_value) +
pyp.Optional(defa) + semi +
pyp.Optional(pyp.restOfLine).suppress())
# an entire section
- section_name = pyp.Word(pyp.alphas + '_')
+ section_name = pyp.Word(pyp.alphas + "_")
section = section_name + lbrace + pyp.ZeroOrMore(pyp.Group(stmt)) + rbrace
bnf = pyp.ZeroOrMore(pyp.Group(section ^ stmt))
"""
args = ["drbdsetup", cls._DevPath(minor), "disk",
backend, meta, "0",
- "-d", "%sm" % size,
"-e", "detach",
"--create-device"]
+ if size:
+ args.extend(["-d", "%sm" % size])
+ if not constants.DRBD_BARRIERS: # disable barriers, if configured so
+ version = cls._GetVersion(cls._GetProcData())
+ # various DRBD versions support different disk barrier options;
+ # what we aim here is to revert back to the 'drain' method of
+ # disk flushes and to disable metadata barriers, in effect going
+ # back to pre-8.0.7 behaviour
+ vmaj = version["k_major"]
+ vmin = version["k_minor"]
+ vrel = version["k_point"]
+ assert vmaj == 8
+ if vmin == 0: # 8.0.x
+ if vrel >= 12:
+ args.extend(["-i", "-m"])
+ elif vmin == 2: # 8.2.x
+ if vrel >= 7:
+ args.extend(["-i", "-m"])
+ elif vmaj >= 3: # 8.3.x or newer
+ args.extend(["-i", "-a", "m"])
result = utils.RunCmd(args)
if result.failed:
_ThrowError("drbd%d: can't attach local disk: %s", minor, result.output)
# about its peer.
cls._SetMinorSyncSpeed(minor, constants.SYNC_SPEED)
+ if netutils.IP6Address.IsValid(lhost):
+ if not netutils.IP6Address.IsValid(rhost):
+ _ThrowError("drbd%d: can't connect ip %s to ip %s" %
+ (minor, lhost, rhost))
+ family = "ipv6"
+ elif netutils.IP4Address.IsValid(lhost):
+ if not netutils.IP4Address.IsValid(rhost):
+ _ThrowError("drbd%d: can't connect ip %s to ip %s" %
+ (minor, lhost, rhost))
+ family = "ipv4"
+ else:
+ _ThrowError("drbd%d: Invalid ip %s" % (minor, lhost))
+
args = ["drbdsetup", cls._DevPath(minor), "net",
- "%s:%s" % (lhost, lport), "%s:%s" % (rhost, rport), protocol,
+ "%s:%s:%s" % (family, lhost, lport),
+ "%s:%s:%s" % (family, rhost, rport), protocol,
"-A", "discard-zero-changes",
"-B", "consensus",
"--create-device",
_ThrowError("drbd%d: can't setup network: %s - %s",
minor, result.fail_reason, result.output)
- timeout = time.time() + 10
- ok = False
- while time.time() < timeout:
+ def _CheckNetworkConfig():
info = cls._GetDevInfo(cls._GetShowData(minor))
if not "local_addr" in info or not "remote_addr" in info:
- time.sleep(1)
- continue
+ raise utils.RetryAgain()
+
if (info["local_addr"] != (lhost, lport) or
info["remote_addr"] != (rhost, rport)):
- time.sleep(1)
- continue
- ok = True
- break
- if not ok:
+ raise utils.RetryAgain()
+
+ try:
+ utils.Retry(_CheckNetworkConfig, 1.0, 10.0)
+ except utils.RetryTimeout:
_ThrowError("drbd%d: timeout while configuring network", minor)
def AddChildren(self, devices):
children_result = super(DRBD8, self).SetSyncSpeed(kbytes)
return self._SetMinorSyncSpeed(self.minor, kbytes) and children_result
+ def PauseResumeSync(self, pause):
+ """Pauses or resumes the sync of a DRBD device.
+
+ @param pause: Wether to pause or resume
+ @return: the success of the operation
+
+ """
+ if self.minor is None:
+ logging.info("Not attached during PauseSync")
+ return False
+
+ children_result = super(DRBD8, self).PauseResumeSync(pause)
+
+ if pause:
+ cmd = "pause-sync"
+ else:
+ cmd = "resume-sync"
+
+ result = utils.RunCmd(["drbdsetup", self.dev_path, cmd])
+ if result.failed:
+ logging.error("Can't %s: %s - %s", cmd,
+ result.fail_reason, result.output)
+ return not result.failed and children_result
+
def GetProcStatus(self):
"""Return device data from /proc.
If sync_percent is None, it means all is ok
- If estimated_time is None, it means we can't esimate
+ If estimated_time is None, it means we can't estimate
the time needed, otherwise it's the time left in seconds.
We set the is_degraded parameter to True on two conditions:
network not connected or local disk missing.
- We compute the ldisk parameter based on wheter we have a local
+ We compute the ldisk parameter based on whether we have a local
disk or not.
- @rtype: tuple
- @return: (sync_percent, estimated_time, is_degraded, ldisk)
+ @rtype: objects.BlockDevStatus
"""
if self.minor is None and not self.Attach():
_ThrowError("drbd%d: can't Attach() in GetSyncStatus", self._aminor)
+
stats = self.GetProcStatus()
- ldisk = not stats.is_disk_uptodate
- is_degraded = not stats.is_connected
- return stats.sync_percent, stats.est_time, is_degraded or ldisk, ldisk
+ is_degraded = not stats.is_connected or not stats.is_disk_uptodate
+
+ if stats.is_disk_uptodate:
+ ldisk_status = constants.LDS_OKAY
+ elif stats.is_diskless:
+ ldisk_status = constants.LDS_FAULTY
+ else:
+ ldisk_status = constants.LDS_UNKNOWN
+
+ return objects.BlockDevStatus(dev_path=self.dev_path,
+ major=self.major,
+ minor=self.minor,
+ sync_percent=stats.sync_percent,
+ estimated_time=stats.est_time,
+ is_degraded=is_degraded,
+ ldisk_status=ldisk_status)
def Open(self, force=False):
"""Make the local state primary.
_ThrowError("drbd%d: DRBD disk missing network info in"
" DisconnectNet()", self.minor)
- ever_disconnected = _IgnoreError(self._ShutdownNet, self.minor)
- timeout_limit = time.time() + self._NET_RECONFIG_TIMEOUT
- sleep_time = 0.100 # we start the retry time at 100 miliseconds
- while time.time() < timeout_limit:
- status = self.GetProcStatus()
- if status.is_standalone:
- break
- # retry the disconnect, it seems possible that due to a
- # well-time disconnect on the peer, my disconnect command might
- # be ingored and forgotten
- ever_disconnected = _IgnoreError(self._ShutdownNet, self.minor) or \
- ever_disconnected
- time.sleep(sleep_time)
- sleep_time = min(2, sleep_time * 1.5)
+ class _DisconnectStatus:
+ def __init__(self, ever_disconnected):
+ self.ever_disconnected = ever_disconnected
- if not status.is_standalone:
- if ever_disconnected:
+ dstatus = _DisconnectStatus(_IgnoreError(self._ShutdownNet, self.minor))
+
+ def _WaitForDisconnect():
+ if self.GetProcStatus().is_standalone:
+ return
+
+ # retry the disconnect, it seems possible that due to a well-time
+ # disconnect on the peer, my disconnect command might be ignored and
+ # forgotten
+ dstatus.ever_disconnected = \
+ _IgnoreError(self._ShutdownNet, self.minor) or dstatus.ever_disconnected
+
+ raise utils.RetryAgain()
+
+ # Keep start time
+ start_time = time.time()
+
+ try:
+ # Start delay at 100 milliseconds and grow up to 2 seconds
+ utils.Retry(_WaitForDisconnect, (0.1, 1.5, 2.0),
+ self._NET_RECONFIG_TIMEOUT)
+ except utils.RetryTimeout:
+ if dstatus.ever_disconnected:
msg = ("drbd%d: device did not react to the"
" 'disconnect' command in a timely manner")
else:
msg = "drbd%d: can't shutdown network, even after multiple retries"
+
_ThrowError(msg, self.minor)
- reconfig_time = time.time() - timeout_limit + self._NET_RECONFIG_TIMEOUT
- if reconfig_time > 15: # hardcoded alert limit
+ reconfig_time = time.time() - start_time
+ if reconfig_time > (self._NET_RECONFIG_TIMEOUT * 0.25):
logging.info("drbd%d: DisconnectNet: detach took %.3f seconds",
self.minor, reconfig_time)
the attach if can return success.
"""
+ # TODO: Rewrite to not use a for loop just because there is 'break'
+ # pylint: disable-msg=W0631
net_data = (self._lhost, self._lport, self._rhost, self._rport)
for minor in (self._aminor,):
info = self._GetDevInfo(self._GetShowData(minor))
cls._InitMeta(aminor, meta.dev_path)
return cls(unique_id, children, size)
- def Grow(self, amount):
+ def Grow(self, amount, dryrun):
"""Resize the DRBD device and its backing storage.
"""
_ThrowError("drbd%d: Grow called while not attached", self._aminor)
if len(self._children) != 2 or None in self._children:
_ThrowError("drbd%d: cannot grow diskless device", self.minor)
- self._children[0].Grow(amount)
- result = utils.RunCmd(["drbdsetup", self.dev_path, "resize"])
+ self._children[0].Grow(amount, dryrun)
+ if dryrun:
+ # DRBD does not support dry-run mode, so we'll return here
+ return
+ result = utils.RunCmd(["drbdsetup", self.dev_path, "resize", "-s",
+ "%dm" % (self.size + amount)])
if result.failed:
_ThrowError("drbd%d: resize failed: %s", self.minor, result.output)
def Shutdown(self):
"""Shutdown the device.
- This is a no-op for the file type, as we don't deacivate
+ This is a no-op for the file type, as we don't deactivate
the file on shutdown.
"""
if err.errno != errno.ENOENT:
_ThrowError("Can't remove file '%s': %s", self.dev_path, err)
+ def Rename(self, new_id):
+ """Renames the file.
+
+ """
+ # TODO: implement rename for file-based storage
+ _ThrowError("Rename is not supported for file-based storage")
+
+ def Grow(self, amount, dryrun):
+ """Grow the file
+
+ @param amount: the amount (in mebibytes) to grow with
+
+ """
+ # Check that the file exists
+ self.Assemble()
+ current_size = self.GetActualSize()
+ new_size = current_size + amount * 1024 * 1024
+ assert new_size > current_size, "Cannot Grow with a negative amount"
+ # We can't really simulate the growth
+ if dryrun:
+ return
+ try:
+ f = open(self.dev_path, "a+")
+ f.truncate(new_size)
+ f.close()
+ except EnvironmentError, err:
+ _ThrowError("Error in file growth: %", str(err))
+
def Attach(self):
"""Attach to an existing file.
self.attached = os.path.exists(self.dev_path)
return self.attached
+ def GetActualSize(self):
+ """Return the actual disk size.
+
+ @note: the device needs to be active when this is called
+
+ """
+ assert self.attached, "BlockDevice not attached in GetActualSize()"
+ try:
+ st = os.stat(self.dev_path)
+ return st.st_size
+ except OSError, err:
+ _ThrowError("Can't stat %s: %s", self.dev_path, err)
+
@classmethod
def Create(cls, unique_id, children, size):
"""Create a new file.
if not isinstance(unique_id, (tuple, list)) or len(unique_id) != 2:
raise ValueError("Invalid configuration data %s" % str(unique_id))
dev_path = unique_id[1]
- if os.path.exists(dev_path):
- _ThrowError("File already existing: %s", dev_path)
try:
- f = open(dev_path, 'w')
+ fd = os.open(dev_path, os.O_RDWR | os.O_CREAT | os.O_EXCL)
+ f = os.fdopen(fd, "w")
f.truncate(size * 1024 * 1024)
f.close()
- except IOError, err:
+ except EnvironmentError, err:
+ if err.errno == errno.EEXIST:
+ _ThrowError("File already existing: %s", dev_path)
_ThrowError("Error in file creation: %", str(err))
return FileStorage(unique_id, children, size)
+class PersistentBlockDevice(BlockDev):
+ """A block device with persistent node
+
+ May be either directly attached, or exposed through DM (e.g. dm-multipath).
+ udev helpers are probably required to give persistent, human-friendly
+ names.
+
+ For the time being, pathnames are required to lie under /dev.
+
+ """
+ def __init__(self, unique_id, children, size):
+ """Attaches to a static block device.
+
+ The unique_id is a path under /dev.
+
+ """
+ super(PersistentBlockDevice, self).__init__(unique_id, children, size)
+ if not isinstance(unique_id, (tuple, list)) or len(unique_id) != 2:
+ raise ValueError("Invalid configuration data %s" % str(unique_id))
+ self.dev_path = unique_id[1]
+ if not os.path.realpath(self.dev_path).startswith("/dev/"):
+ raise ValueError("Full path '%s' lies outside /dev" %
+ os.path.realpath(self.dev_path))
+ # TODO: this is just a safety guard checking that we only deal with devices
+ # we know how to handle. In the future this will be integrated with
+ # external storage backends and possible values will probably be collected
+ # from the cluster configuration.
+ if unique_id[0] != constants.BLOCKDEV_DRIVER_MANUAL:
+ raise ValueError("Got persistent block device of invalid type: %s" %
+ unique_id[0])
+
+ self.major = self.minor = None
+ self.Attach()
+
+ @classmethod
+ def Create(cls, unique_id, children, size):
+ """Create a new device
+
+ This is a noop, we only return a PersistentBlockDevice instance
+
+ """
+ return PersistentBlockDevice(unique_id, children, 0)
+
+ def Remove(self):
+ """Remove a device
+
+ This is a noop
+
+ """
+ pass
+
+ def Rename(self, new_id):
+ """Rename this device.
+
+ """
+ _ThrowError("Rename is not supported for PersistentBlockDev storage")
+
+ def Attach(self):
+ """Attach to an existing block device.
+
+
+ """
+ self.attached = False
+ try:
+ st = os.stat(self.dev_path)
+ except OSError, err:
+ logging.error("Error stat()'ing %s: %s", self.dev_path, str(err))
+ return False
+
+ if not stat.S_ISBLK(st.st_mode):
+ logging.error("%s is not a block device", self.dev_path)
+ return False
+
+ self.major = os.major(st.st_rdev)
+ self.minor = os.minor(st.st_rdev)
+ self.attached = True
+
+ return True
+
+ def Assemble(self):
+ """Assemble the device.
+
+ """
+ pass
+
+ def Shutdown(self):
+ """Shutdown the device.
+
+ """
+ pass
+
+ def Open(self, force=False):
+ """Make the device ready for I/O.
+
+ """
+ pass
+
+ def Close(self):
+ """Notifies that the device will no longer be used for I/O.
+
+ """
+ pass
+
+ def Grow(self, amount, dryrun):
+ """Grow the logical volume.
+
+ """
+ _ThrowError("Grow is not supported for PersistentBlockDev storage")
+
+
DEV_MAP = {
constants.LD_LV: LogicalVolume,
constants.LD_DRBD8: DRBD8,
- constants.LD_FILE: FileStorage,
+ constants.LD_BLOCKDEV: PersistentBlockDevice,
}
+if constants.ENABLE_FILE_STORAGE or constants.ENABLE_SHARED_FILE_STORAGE:
+ DEV_MAP[constants.LD_FILE] = FileStorage
+
def FindDevice(dev_type, unique_id, children, size):
"""Search for an existing, assembled device.