import re
import time
import errno
+import pyparsing as pyp
+import os
from ganeti import utils
from ganeti import logger
- md arrays are created or assembled and used
- drbd devices are attached to a local disk/remote peer and made primary
- The status of the device can be examined by `GetStatus()`, which
- returns a numerical value, depending on the position in the
- transition stack of the device.
-
A block device is identified by three items:
- the /dev path of the device (dynamic)
- a unique ID of the device (static)
after assembly we'll have our correct major/minor.
"""
- STATUS_UNKNOWN = 0
- STATUS_EXISTING = 1
- STATUS_STANDBY = 2
- STATUS_ONLINE = 3
-
- STATUS_MAP = {
- STATUS_UNKNOWN: "unknown",
- STATUS_EXISTING: "existing",
- STATUS_STANDBY: "ready for use",
- STATUS_ONLINE: "online",
- }
-
-
def __init__(self, unique_id, children):
self._children = children
self.dev_path = None
self.major = None
self.minor = None
-
def Assemble(self):
"""Assemble the device from its components.
status = status and child.Assemble()
if not status:
break
- status = status and child.Open()
+
+ try:
+ child.Open()
+ except errors.BlockDeviceError:
+ for child in self._children:
+ child.Shutdown()
+ raise
if not status:
for child in self._children:
child.Shutdown()
return status
-
def Attach(self):
"""Find a device which matches our config and attach to it.
"""
raise NotImplementedError
-
def Close(self):
"""Notifies that the device will no longer be used for I/O.
"""
raise NotImplementedError
-
@classmethod
def Create(cls, unique_id, children, size):
"""Create the device.
"""
raise NotImplementedError
-
def Remove(self):
"""Remove this device.
"""
raise NotImplementedError
+ def Rename(self, new_id):
+ """Rename this device.
- def GetStatus(self):
- """Return the status of the device.
+ This may or may not make sense for a given device type.
"""
raise NotImplementedError
-
def Open(self, force=False):
"""Make the device ready for use.
"""
raise NotImplementedError
-
def Shutdown(self):
"""Shut down the device, freeing its children.
"""
raise NotImplementedError
-
def SetSyncSpeed(self, speed):
"""Adjust the sync speed of the mirror.
result = result and child.SetSyncSpeed(speed)
return result
-
def GetSyncStatus(self):
"""Returns the sync status of the device.
status of the mirror.
Returns:
- (sync_percent, estimated_time, is_degraded)
+ (sync_percent, estimated_time, is_degraded, ldisk)
+
+ If sync_percent is None, it means the device is not syncing.
- If sync_percent is None, it means all is ok
If estimated_time is None, it means we can't estimate
- the time needed, otherwise it's the time left in seconds
+ the time needed, otherwise it's the time left in seconds.
+
If is_degraded is True, it means the device is missing
redundancy. This is usually a sign that something went wrong in
the device setup, if sync_percent is None.
+ The ldisk parameter represents the degradation of the local
+ data. This is only valid for some devices, the rest will always
+ return False (not degraded).
+
"""
- return None, None, False
+ return None, None, False, False
def CombinedSyncStatus(self):
children.
"""
- min_percent, max_time, is_degraded = self.GetSyncStatus()
+ min_percent, max_time, is_degraded, ldisk = self.GetSyncStatus()
if self._children:
for child in self._children:
- c_percent, c_time, c_degraded = child.GetSyncStatus()
+ c_percent, c_time, c_degraded, c_ldisk = child.GetSyncStatus()
if min_percent is None:
min_percent = c_percent
elif c_percent is not None:
elif c_time is not None:
max_time = max(max_time, c_time)
is_degraded = is_degraded or c_degraded
- return min_percent, max_time, is_degraded
+ ldisk = ldisk or c_ldisk
+ return min_percent, max_time, is_degraded, ldisk
def SetInfo(self, text):
self.dev_path = "/dev/%s/%s" % (self._vg_name, self._lv_name)
self.Attach()
-
@classmethod
def Create(cls, unique_id, children, size):
"""Create a new logical volume.
return not result.failed
+ def Rename(self, new_id):
+ """Rename this logical volume.
+
+ """
+ if not isinstance(new_id, (tuple, list)) or len(new_id) != 2:
+ raise errors.ProgrammerError("Invalid new logical id '%s'" % new_id)
+ new_vg, new_name = new_id
+ if new_vg != self._vg_name:
+ raise errors.ProgrammerError("Can't move a logical volume across"
+ " volume groups (from %s to to %s)" %
+ (self._vg_name, new_vg))
+ result = utils.RunCmd(["lvrename", new_vg, self._lv_name, new_name])
+ if result.failed:
+ raise errors.BlockDeviceError("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)
def Attach(self):
"""Attach to an existing LV.
This method will try to see if an existing and active LV exists
- which matches the our name. If so, its major/minor will be
+ which matches our name. If so, its major/minor will be
recorded.
"""
result = utils.RunCmd(["lvdisplay", self.dev_path])
if result.failed:
- logger.Error("Can't find LV %s: %s" %
- (self.dev_path, result.fail_reason))
+ logger.Error("Can't find LV %s: %s, %s" %
+ (self.dev_path, result.fail_reason, result.output))
return False
match = re.compile("^ *Block device *([0-9]+):([0-9]+).*$")
for line in result.stdout.splitlines():
return True
return False
-
def Assemble(self):
"""Assemble the device.
- This is a no-op for the LV device type. Eventually, we could
- lvchange -ay here if we see that the LV is not active.
+ We alway 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).
"""
- return True
-
+ result = utils.RunCmd(["lvchange", "-ay", self.dev_path])
+ if result.failed:
+ logger.Error("Can't activate lv %s: %s" % (self.dev_path, result.output))
+ return not result.failed
def Shutdown(self):
"""Shutdown the device.
"""
return True
+ def GetSyncStatus(self):
+ """Returns the sync status of the device.
+
+ If this device is a mirroring device, this function returns the
+ status of the mirror.
+
+ Returns:
+ (sync_percent, estimated_time, is_degraded, ldisk)
- def GetStatus(self):
- """Return the status of the device.
+ For logical volumes, sync_percent and estimated_time are always
+ None (no recovery in progress, as we don't handle the mirrored LV
+ case). The is_degraded parameter is the inverse of the ldisk
+ parameter.
- Logical volumes will can be in all four states, although we don't
- deactivate (lvchange -an) them when shutdown, so STATUS_EXISTING
- should not be seen for our devices.
+ For the ldisk parameter, we check if the logical volume has the
+ 'virtual' type, which means it's not backed by existing storage
+ anymore (read from it return I/O error). This happens after a
+ physical disk failure and subsequent 'vgreduce --removemissing' on
+ the volume group.
"""
result = utils.RunCmd(["lvs", "--noheadings", "-olv_attr", self.dev_path])
if result.failed:
logger.Error("Can't display lv: %s" % result.fail_reason)
- return self.STATUS_UNKNOWN
+ return None, None, True, True
out = result.stdout.strip()
# format: type/permissions/alloc/fixed_minor/state/open
if len(out) != 6:
- return self.STATUS_UNKNOWN
- #writable = (out[1] == "w")
- active = (out[4] == "a")
- online = (out[5] == "o")
- if online:
- retval = self.STATUS_ONLINE
- elif active:
- retval = self.STATUS_STANDBY
- else:
- retval = self.STATUS_EXISTING
-
- return retval
-
+ logger.Debug("Error in lvs output: attrs=%s, len != 6" % out)
+ return None, None, True, True
+ ldisk = out[0] == 'v' # virtual volume, i.e. doesn't have
+ # backing storage
+ return None, None, ldisk, ldisk
def Open(self, force=False):
"""Make the device ready for I/O.
This is a no-op for the LV device type.
"""
- return True
-
+ pass
def Close(self):
"""Notifies that the device will no longer be used for I/O.
This is a no-op for the LV device type.
"""
- return True
-
+ pass
def Snapshot(self, size):
"""Create a snapshot copy of an lvm block device.
return snap_name
-
def SetInfo(self, text):
"""Update metadata with info text.
self.major = 9
self.Attach()
-
def Attach(self):
"""Find an array which matches our config and attach to it.
return (minor is not None)
-
@staticmethod
def _GetUsedDevs():
"""Compute the list of in-use MD devices.
return used_md
-
@staticmethod
def _GetDevInfo(minor):
"""Get info about a MD device.
retval["state"] = kv[1].split(", ")
return retval
-
@staticmethod
def _FindUnusedMinor():
"""Compute an unused MD minor.
raise errors.BlockDeviceError("Can't find a free MD minor")
return i
-
@classmethod
def _FindMDByUUID(cls, uuid):
"""Find the minor of an MD array with a given UUID.
return minor
return None
-
@staticmethod
def _ZeroSuperblock(dev_path):
"""Zero the possible locations for an MD superblock.
return None
return MDRaid1(info["uuid"], children)
-
def Remove(self):
"""Stub remove function for MD RAID 1 arrays.
#TODO: maybe zero superblock on child devices?
return self.Shutdown()
+ def Rename(self, new_id):
+ """Rename a device.
+
+ This is not supported for md raid1 devices.
- def AddChild(self, device):
- """Add a new member to the md raid1.
+ """
+ raise errors.ProgrammerError("Can't rename a md raid1 device")
+
+ def AddChildren(self, devices):
+ """Add new member(s) to the md raid1.
"""
if self.minor is None and not self.Attach():
raise errors.BlockDeviceError("Can't attach to device")
- if device.dev_path is None:
- raise errors.BlockDeviceError("New child is not initialised")
- result = utils.RunCmd(["mdadm", "-a", self.dev_path, device.dev_path])
+
+ args = ["mdadm", "-a", self.dev_path]
+ for dev in devices:
+ if dev.dev_path is None:
+ raise errors.BlockDeviceError("Child '%s' is not initialised" % dev)
+ dev.Open()
+ args.append(dev.dev_path)
+ result = utils.RunCmd(args)
if result.failed:
raise errors.BlockDeviceError("Failed to add new device to array: %s" %
result.output)
- new_len = len(self._children) + 1
+ new_len = len(self._children) + len(devices)
result = utils.RunCmd(["mdadm", "--grow", self.dev_path, "-n", new_len])
if result.failed:
raise errors.BlockDeviceError("Can't grow md array: %s" %
result.output)
- self._children.append(device)
-
+ self._children.extend(devices)
- def RemoveChild(self, dev_path):
- """Remove member from the md raid1.
+ def RemoveChildren(self, devices):
+ """Remove member(s) from the md raid1.
"""
if self.minor is None and not self.Attach():
raise errors.BlockDeviceError("Can't attach to device")
- if len(self._children) == 1:
- raise errors.BlockDeviceError("Can't reduce member when only one"
- " child left")
- for device in self._children:
- if device.dev_path == dev_path:
- break
- else:
- raise errors.BlockDeviceError("Can't find child with this path")
- new_len = len(self._children) - 1
- result = utils.RunCmd(["mdadm", "-f", self.dev_path, dev_path])
+ new_len = len(self._children) - len(devices)
+ if new_len < 1:
+ raise errors.BlockDeviceError("Can't reduce to less than one child")
+ args = ["mdadm", "-f", self.dev_path]
+ orig_devs = []
+ for dev in devices:
+ args.append(dev)
+ for c in self._children:
+ if c.dev_path == dev:
+ orig_devs.append(c)
+ break
+ else:
+ raise errors.BlockDeviceError("Can't find device '%s' for removal" %
+ dev)
+ result = utils.RunCmd(args)
if result.failed:
- raise errors.BlockDeviceError("Failed to mark device as failed: %s" %
+ raise errors.BlockDeviceError("Failed to mark device(s) as failed: %s" %
result.output)
# it seems here we need a short delay for MD to update its
# superblocks
time.sleep(0.5)
- result = utils.RunCmd(["mdadm", "-r", self.dev_path, dev_path])
+ args[1] = "-r"
+ result = utils.RunCmd(args)
if result.failed:
- raise errors.BlockDeviceError("Failed to remove device from array:"
- " %s" % result.output)
+ raise errors.BlockDeviceError("Failed to remove device(s) from array:"
+ " %s" % result.output)
result = utils.RunCmd(["mdadm", "--grow", "--force", self.dev_path,
"-n", new_len])
if result.failed:
raise errors.BlockDeviceError("Can't shrink md array: %s" %
result.output)
- self._children.remove(device)
-
-
- def GetStatus(self):
- """Return the status of the device.
-
- """
- self.Attach()
- if self.minor is None:
- retval = self.STATUS_UNKNOWN
- else:
- retval = self.STATUS_ONLINE
- return retval
-
+ for dev in orig_devs:
+ self._children.remove(dev)
def _SetFromMinor(self, minor):
"""Set our parameters based on the given minor.
self.minor = minor
self.dev_path = "/dev/md%d" % minor
-
def Assemble(self):
"""Assemble the MD device.
self.minor = free_minor
return not result.failed
-
def Shutdown(self):
"""Tear down the MD array.
self.dev_path = None
return True
-
def SetSyncSpeed(self, kbytes):
"""Set the maximum sync speed for the MD array.
f.close()
return result
-
def GetSyncStatus(self):
"""Returns the sync status of the device.
Returns:
- (sync_percent, estimated_time)
+ (sync_percent, estimated_time, is_degraded, ldisk)
If sync_percent is None, it means all is ok
If estimated_time is None, it means we can't esimate
- the time needed, otherwise it's the time left in seconds
+ the time needed, otherwise it's the time left in seconds.
+
+ The ldisk parameter is always true for MD devices.
"""
if self.minor is None and not self.Attach():
sync_status = f.readline().strip()
f.close()
if sync_status == "idle":
- return None, None, not is_clean
+ return None, None, not is_clean, False
f = file(sys_path + "sync_completed")
sync_completed = f.readline().strip().split(" / ")
f.close()
if len(sync_completed) != 2:
- return 0, None, not is_clean
+ return 0, None, not is_clean, False
sync_done, sync_total = [float(i) for i in sync_completed]
sync_percent = 100.0*sync_done/sync_total
f = file(sys_path + "sync_speed")
time_est = None
else:
time_est = (sync_total - sync_done) / 2 / sync_speed_k
- return sync_percent, time_est, not is_clean
-
+ return sync_percent, time_est, not is_clean, False
def Open(self, force=False):
"""Make the device ready for I/O.
the 2.6.18's new array_state thing.
"""
- return True
-
+ pass
def Close(self):
"""Notifies that the device will no longer be used for I/O.
`Open()`.
"""
- return True
+ pass
class BaseDRBD(BlockDev):
"""
_VERSION_RE = re.compile(r"^version: (\d+)\.(\d+)\.(\d+)"
- r" \(api:(\d+)/proto:(\d+)\)")
+ r" \(api:(\d+)/proto:(\d+)(?:-(\d+))?\)")
+
_DRBD_MAJOR = 147
_ST_UNCONFIGURED = "Unconfigured"
_ST_WFCONNECTION = "WFConnection"
raise errors.BlockDeviceError("Can't read any data from /proc/drbd")
return data
+ @staticmethod
+ def _MassageProcData(data):
+ """Transform the output of _GetProdData into a nicer form.
+
+ Returns:
+ 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 lresult is not None:
+ if old_minor is not None:
+ results[old_minor] = old_line
+ old_minor = int(lresult.group(1))
+ old_line = line
+ else:
+ if old_minor is not None:
+ old_line += " " + line.strip()
+ # add last line
+ if old_minor is not None:
+ results[old_minor] = old_line
+ return results
+
@classmethod
def _GetVersion(cls):
"""Return the DRBD version.
- This will return a list [k_major, k_minor, k_point, api, proto].
+ This will return a dict with keys:
+ k_major,
+ k_minor,
+ k_point,
+ api,
+ proto,
+ proto2 (only on drbd > 8.2.X)
"""
proc_data = cls._GetProcData()
if not version:
raise errors.BlockDeviceError("Can't parse DRBD version from '%s'" %
first_line)
- return [int(val) for val in version.groups()]
+
+ 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]),
+ }
+ if values[5] is not None:
+ retval['proto2'] = values[5]
+
+ return retval
@staticmethod
def _DevPath(minor):
return used_devs
+ def _SetFromMinor(self, minor):
+ """Set our parameters based on the given minor.
+
+ This sets our minor variable and our dev_path.
+
+ """
+ if minor is None:
+ self.minor = self.dev_path = None
+ else:
+ self.minor = minor
+ self.dev_path = self._DevPath(minor)
+
+ @staticmethod
+ def _CheckMetaSize(meta_device):
+ """Check if the given meta device looks like a valid one.
+
+ This currently only check the size, which must be around
+ 128MiB.
+
+ """
+ result = utils.RunCmd(["blockdev", "--getsize", meta_device])
+ if result.failed:
+ logger.Error("Failed to get device size: %s" % result.fail_reason)
+ return False
+ try:
+ sectors = int(result.stdout)
+ except ValueError:
+ logger.Error("Invalid output from blockdev: '%s'" % result.stdout)
+ return False
+ bytes = sectors * 512
+ if bytes < 128 * 1024 * 1024: # less than 128MiB
+ logger.Error("Meta device too small (%.2fMib)" % (bytes / 1024 / 1024))
+ return False
+ if bytes > (128 + 32) * 1024 * 1024: # account for an extra (big) PE on LVM
+ logger.Error("Meta device too big (%.2fMiB)" % (bytes / 1024 / 1024))
+ return False
+ return True
+
+ def Rename(self, new_id):
+ """Rename a device.
+
+ This is not supported for drbd devices.
+
+ """
+ raise errors.ProgrammerError("Can't rename a drbd device")
+
class DRBDev(BaseDRBD):
"""DRBD block device.
def __init__(self, unique_id, children):
super(DRBDev, self).__init__(unique_id, children)
self.major = self._DRBD_MAJOR
- [kmaj, kmin, kfix, api, proto] = self._GetVersion()
- if kmaj != 0 and kmin != 7:
+ version = self._GetVersion()
+ if version['k_major'] != 0 and version['k_minor'] != 7:
raise errors.BlockDeviceError("Mismatch in DRBD kernel version and"
" requested ganeti usage: kernel is"
- " %s.%s, ganeti wants 0.7" % (kmaj, kmin))
-
+ " %s.%s, ganeti wants 0.7" %
+ (version['k_major'], version['k_minor']))
if len(children) != 2:
raise ValueError("Invalid configuration data %s" % str(children))
if not isinstance(unique_id, (tuple, list)) or len(unique_id) != 4:
continue
return data
-
def _MatchesLocal(self, info):
"""Test if our local config matches with an existing device.
info["meta_index"] == -1)
return retval
-
def _MatchesNet(self, info):
"""Test if our network config matches with an existing device.
info["remote_addr"] == (self._rhost, self._rport))
return retval
-
- @staticmethod
- def _IsValidMeta(meta_device):
- """Check if the given meta device looks like a valid one.
-
- This currently only check the size, which must be around
- 128MiB.
-
- """
- result = utils.RunCmd(["blockdev", "--getsize", meta_device])
- if result.failed:
- logger.Error("Failed to get device size: %s" % result.fail_reason)
- return False
- try:
- sectors = int(result.stdout)
- except ValueError:
- logger.Error("Invalid output from blockdev: '%s'" % result.stdout)
- return False
- bytes = sectors * 512
- if bytes < 128*1024*1024: # less than 128MiB
- logger.Error("Meta device too small (%.2fMib)" % (bytes/1024/1024))
- return False
- if bytes > (128+32)*1024*1024: # account for an extra (big) PE on LVM
- logger.Error("Meta device too big (%.2fMiB)" % (bytes/1024/1024))
- return False
- return True
-
-
@classmethod
def _AssembleLocal(cls, minor, backend, meta):
"""Configure the local part of a DRBD device.
device. And it must be done only once.
"""
- if not cls._IsValidMeta(meta):
+ if not cls._CheckMetaSize(meta):
return False
result = utils.RunCmd(["drbdsetup", cls._DevPath(minor), "disk",
backend, meta, "0", "-e", "detach"])
logger.Error("Can't attach local disk: %s" % result.output)
return not result.failed
-
@classmethod
def _ShutdownLocal(cls, minor):
"""Detach from the local device.
logger.Error("Can't detach local device: %s" % result.output)
return not result.failed
-
@staticmethod
def _ShutdownAll(minor):
"""Deactivate the device.
logger.Error("Can't shutdown drbd device: %s" % result.output)
return not result.failed
-
@classmethod
def _AssembleNet(cls, minor, net_info, protocol):
"""Configure the network part of the device.
return False
return True
-
@classmethod
def _ShutdownNet(cls, minor):
"""Disconnect from the remote peer.
"""
result = utils.RunCmd(["drbdsetup", cls._DevPath(minor), "disconnect"])
- logger.Error("Can't shutdown network: %s" % result.output)
+ if result.failed:
+ logger.Error("Can't shutdown network: %s" % result.output)
return not result.failed
-
- def _SetFromMinor(self, minor):
- """Set our parameters based on the given minor.
-
- This sets our minor variable and our dev_path.
-
- """
- if minor is None:
- self.minor = self.dev_path = None
- else:
- self.minor = minor
- self.dev_path = self._DevPath(minor)
-
-
def Assemble(self):
"""Assemble the drbd.
self._SetFromMinor(minor)
return True
-
def Shutdown(self):
"""Shutdown the DRBD device.
self.dev_path = None
return True
-
def Attach(self):
"""Find a DRBD device which matches our config and attach to it.
self._SetFromMinor(minor)
return minor is not None
-
def Open(self, force=False):
"""Make the local state primary.
cmd.append("--do-what-I-say")
result = utils.RunCmd(cmd)
if result.failed:
- logger.Error("Can't make drbd device primary: %s" % result.output)
- return False
- return True
-
+ msg = ("Can't make drbd device primary: %s" % result.output)
+ logger.Error(msg)
+ raise errors.BlockDeviceError(msg)
def Close(self):
"""Make the local state secondary.
raise errors.BlockDeviceError("Can't find device")
result = utils.RunCmd(["drbdsetup", self.dev_path, "secondary"])
if result.failed:
- logger.Error("Can't switch drbd device to secondary: %s" % result.output)
- raise errors.BlockDeviceError("Can't switch drbd device to secondary")
-
+ msg = ("Can't switch drbd device to"
+ " secondary: %s" % result.output)
+ logger.Error(msg)
+ raise errors.BlockDeviceError(msg)
def SetSyncSpeed(self, kbytes):
"""Set the speed of the DRBD syncer.
logger.Error("Can't change syncer rate: %s " % result.fail_reason)
return not result.failed and children_result
-
def GetSyncStatus(self):
"""Returns the sync status of the device.
Returns:
- (sync_percent, estimated_time)
+ (sync_percent, estimated_time, is_degraded, ldisk)
If sync_percent is None, it means all is ok
If estimated_time is None, it means we can't esimate
- the time needed, otherwise it's the time left in seconds
+ the time needed, otherwise it's the time left in seconds.
+
+ The ldisk parameter will be returned as True, since the DRBD7
+ devices have not been converted.
"""
if self.minor is None and not self.Attach():
self.minor)
client_state = match.group(1)
is_degraded = client_state != "Connected"
- return sync_percent, est_time, is_degraded
-
-
- @staticmethod
- def _MassageProcData(data):
- """Transform the output of _GetProdData into a nicer form.
-
- Returns:
- 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 lresult is not None:
- if old_minor is not None:
- results[old_minor] = old_line
- old_minor = int(lresult.group(1))
- old_line = line
- else:
- if old_minor is not None:
- old_line += " " + line.strip()
- # add last line
- if old_minor is not None:
- results[old_minor] = old_line
- return results
-
-
- def GetStatus(self):
- """Compute the status of the DRBD device
-
- Note that DRBD devices don't have the STATUS_EXISTING state.
-
- """
- if self.minor is None and not self.Attach():
- return self.STATUS_UNKNOWN
-
- data = self._GetProcData()
- match = re.compile("^ *%d: cs:[^ ]+ st:(Primary|Secondary)/.*$" %
- self.minor)
- for line in data:
- mresult = match.match(line)
- if mresult:
- break
- else:
- logger.Error("Can't find myself!")
- return self.STATUS_UNKNOWN
-
- state = mresult.group(2)
- if state == "Primary":
- result = self.STATUS_ONLINE
- else:
- result = self.STATUS_STANDBY
-
- return result
-
+ return sync_percent, est_time, is_degraded, False
@staticmethod
def _ZeroDevice(device):
if err.errno != errno.ENOSPC:
raise
-
@classmethod
def Create(cls, unique_id, children, size):
"""Create a new DRBD device.
meta.Assemble()
if not meta.Attach():
raise errors.BlockDeviceError("Can't attach to meta device")
- if not cls._IsValidMeta(meta.dev_path):
+ if not cls._CheckMetaSize(meta.dev_path):
raise errors.BlockDeviceError("Invalid meta device")
logger.Info("Started zeroing device %s" % meta.dev_path)
cls._ZeroDevice(meta.dev_path)
logger.Info("Done zeroing device %s" % meta.dev_path)
return cls(unique_id, children)
-
def Remove(self):
"""Stub remove for DRBD devices.
return self.Shutdown()
-DEV_MAP = {
- constants.LD_LV: LogicalVolume,
- constants.LD_MD_R1: MDRaid1,
- constants.LD_DRBD7: DRBDev,
- }
-
+class DRBD8(BaseDRBD):
+ """DRBD v8.x block device.
-def FindDevice(dev_type, unique_id, children):
+ This implements the local host part of the DRBD device, i.e. it
+ doesn't do anything to the supposed peer. If you need a fully
+ connected DRBD pair, you need to use this class on both hosts.
+
+ The unique_id for the drbd device is the (local_ip, local_port,
+ remote_ip, remote_port) tuple, and it must have two children: the
+ data device and the meta_device. The meta device is checked for
+ valid size and is zeroed on create.
+
+ """
+ _MAX_MINORS = 255
+ _PARSE_SHOW = None
+
+ def __init__(self, unique_id, children):
+ if children and children.count(None) > 0:
+ children = []
+ super(DRBD8, self).__init__(unique_id, children)
+ self.major = self._DRBD_MAJOR
+ version = self._GetVersion()
+ if version['k_major'] != 8 :
+ raise errors.BlockDeviceError("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) != 4:
+ raise ValueError("Invalid configuration data %s" % str(unique_id))
+ self._lhost, self._lport, self._rhost, self._rport = unique_id
+ self.Attach()
+
+ @classmethod
+ def _InitMeta(cls, minor, dev_path):
+ """Initialize a meta device.
+
+ This will not work if the given minor is in use.
+
+ """
+ result = utils.RunCmd(["drbdmeta", "--force", cls._DevPath(minor),
+ "v08", dev_path, "0", "create-md"])
+ if result.failed:
+ raise errors.BlockDeviceError("Can't initialize meta device: %s" %
+ result.output)
+
+ @classmethod
+ def _FindUnusedMinor(cls):
+ """Find an unused DRBD device.
+
+ This is specific to 8.x as the minors are allocated dynamically,
+ so non-existing numbers up to a max minor count are actually free.
+
+ """
+ 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)
+ if match:
+ return int(match.group(1))
+ match = used_line.match(line)
+ if match:
+ minor = int(match.group(1))
+ highest = max(highest, minor)
+ if highest is None: # there are no minors in use at all
+ return 0
+ if highest >= cls._MAX_MINORS:
+ logger.Error("Error: no free drbd minors!")
+ raise errors.BlockDeviceError("Can't find a free DRBD minor")
+ return highest + 1
+
+ @classmethod
+ def _IsValidMeta(cls, meta_device):
+ """Check if the given meta device looks like a valid one.
+
+ """
+ minor = cls._FindUnusedMinor()
+ minor_path = cls._DevPath(minor)
+ result = utils.RunCmd(["drbdmeta", minor_path,
+ "v08", meta_device, "0",
+ "dstate"])
+ if result.failed:
+ logger.Error("Invalid meta device %s: %s" % (meta_device, result.output))
+ return False
+ return True
+
+ @classmethod
+ def _GetShowParser(cls):
+ """Return a parser for `drbd show` output.
+
+ This will either create or return an already-create parser for the
+ output of the command `drbd show`.
+
+ """
+ if cls._PARSE_SHOW is not None:
+ return cls._PARSE_SHOW
+
+ # pyparsing setup
+ lbrace = pyp.Literal("{").suppress()
+ rbrace = pyp.Literal("}").suppress()
+ semi = pyp.Literal(";").suppress()
+ # this also converts the value to an int
+ number = pyp.Word(pyp.nums).setParseAction(lambda s, l, t: int(t[0]))
+
+ comment = pyp.Literal ("#") + pyp.Optional(pyp.restOfLine)
+ defa = pyp.Literal("_is_default").suppress()
+ dbl_quote = pyp.Literal('"').suppress()
+
+ keyword = pyp.Word(pyp.alphanums + '-')
+
+ # value types
+ value = pyp.Word(pyp.alphanums + '_-/.:')
+ quoted = dbl_quote + pyp.CharsNotIn('"') + dbl_quote
+ addr_port = (pyp.Word(pyp.nums + '.') + pyp.Literal(':').suppress() +
+ number)
+ # meta device, extended syntax
+ meta_value = ((value ^ quoted) + pyp.Literal('[').suppress() +
+ number + pyp.Word(']').suppress())
+
+ # a statement
+ stmt = (~rbrace + keyword + ~lbrace +
+ (addr_port ^ value ^ quoted ^ meta_value) +
+ pyp.Optional(defa) + semi +
+ pyp.Optional(pyp.restOfLine).suppress())
+
+ # an entire section
+ section_name = pyp.Word(pyp.alphas + '_')
+ section = section_name + lbrace + pyp.ZeroOrMore(pyp.Group(stmt)) + rbrace
+
+ bnf = pyp.ZeroOrMore(pyp.Group(section ^ stmt))
+ bnf.ignore(comment)
+
+ cls._PARSE_SHOW = bnf
+
+ return bnf
+
+ @classmethod
+ def _GetShowData(cls, minor):
+ """Return the `drbdsetup show` data for a minor.
+
+ """
+ result = utils.RunCmd(["drbdsetup", cls._DevPath(minor), "show"])
+ if result.failed:
+ logger.Error("Can't display the drbd config: %s" % result.fail_reason)
+ return None
+ return result.stdout
+
+ @classmethod
+ def _GetDevInfo(cls, out):
+ """Parse details about a given DRBD minor.
+
+ This return, if available, the local backing device (as a path)
+ and the local and remote (ip, port) information from a string
+ containing the output of the `drbdsetup show` command as returned
+ by _GetShowData.
+
+ """
+ data = {}
+ if not out:
+ return data
+
+ bnf = cls._GetShowParser()
+ # run pyparse
+
+ try:
+ results = bnf.parseString(out)
+ except pyp.ParseException, err:
+ raise errors.BlockDeviceError("Can't parse drbdsetup show output: %s" %
+ str(err))
+
+ # and massage the results into our desired format
+ for section in results:
+ sname = section[0]
+ if sname == "_this_host":
+ for lst in section[1:]:
+ if lst[0] == "disk":
+ data["local_dev"] = lst[1]
+ elif lst[0] == "meta-disk":
+ data["meta_dev"] = lst[1]
+ data["meta_index"] = lst[2]
+ elif lst[0] == "address":
+ data["local_addr"] = tuple(lst[1:])
+ elif sname == "_remote_host":
+ for lst in section[1:]:
+ if lst[0] == "address":
+ data["remote_addr"] = tuple(lst[1:])
+ return data
+
+ def _MatchesLocal(self, info):
+ """Test if our local config matches with an existing device.
+
+ The parameter should be as returned from `_GetDevInfo()`. This
+ method tests if our local backing device is the same as the one in
+ the info parameter, in effect testing if we look like the given
+ device.
+
+ """
+ if self._children:
+ backend, meta = self._children
+ else:
+ backend = meta = None
+
+ if backend is not None:
+ retval = ("local_dev" in info and info["local_dev"] == backend.dev_path)
+ else:
+ retval = ("local_dev" not in info)
+
+ if meta is not None:
+ retval = retval and ("meta_dev" in info and
+ info["meta_dev"] == meta.dev_path)
+ retval = retval and ("meta_index" in info and
+ info["meta_index"] == 0)
+ else:
+ retval = retval and ("meta_dev" not in info and
+ "meta_index" not in info)
+ return retval
+
+ def _MatchesNet(self, info):
+ """Test if our network config matches with an existing device.
+
+ The parameter should be as returned from `_GetDevInfo()`. This
+ method tests if our network configuration is the same as the one
+ in the info parameter, in effect testing if we look like the given
+ device.
+
+ """
+ if (((self._lhost is None and not ("local_addr" in info)) and
+ (self._rhost is None and not ("remote_addr" in info)))):
+ return True
+
+ if self._lhost is None:
+ return False
+
+ if not ("local_addr" in info and
+ "remote_addr" in info):
+ return False
+
+ retval = (info["local_addr"] == (self._lhost, self._lport))
+ retval = (retval and
+ info["remote_addr"] == (self._rhost, self._rport))
+ return retval
+
+ @classmethod
+ def _AssembleLocal(cls, minor, backend, meta):
+ """Configure the local part of a DRBD device.
+
+ This is the first thing that must be done on an unconfigured DRBD
+ device. And it must be done only once.
+
+ """
+ if not cls._IsValidMeta(meta):
+ return False
+ result = utils.RunCmd(["drbdsetup", cls._DevPath(minor), "disk",
+ backend, meta, "0", "-e", "detach",
+ "--create-device"])
+ if result.failed:
+ logger.Error("Can't attach local disk: %s" % result.output)
+ return not result.failed
+
+ @classmethod
+ def _AssembleNet(cls, minor, net_info, protocol,
+ dual_pri=False, hmac=None, secret=None):
+ """Configure the network part of the device.
+
+ """
+ lhost, lport, rhost, rport = net_info
+ if None in net_info:
+ # we don't want network connection and actually want to make
+ # sure its shutdown
+ return cls._ShutdownNet(minor)
+
+ args = ["drbdsetup", cls._DevPath(minor), "net",
+ "%s:%s" % (lhost, lport), "%s:%s" % (rhost, rport), protocol,
+ "-A", "discard-zero-changes",
+ "-B", "consensus",
+ ]
+ if dual_pri:
+ args.append("-m")
+ if hmac and secret:
+ args.extend(["-a", hmac, "-x", secret])
+ result = utils.RunCmd(args)
+ if result.failed:
+ logger.Error("Can't setup network for dbrd device: %s" %
+ result.fail_reason)
+ return False
+
+ timeout = time.time() + 10
+ ok = False
+ while time.time() < timeout:
+ info = cls._GetDevInfo(cls._GetShowData(minor))
+ if not "local_addr" in info or not "remote_addr" in info:
+ time.sleep(1)
+ continue
+ if (info["local_addr"] != (lhost, lport) or
+ info["remote_addr"] != (rhost, rport)):
+ time.sleep(1)
+ continue
+ ok = True
+ break
+ if not ok:
+ logger.Error("Timeout while configuring network")
+ return False
+ return True
+
+ def AddChildren(self, devices):
+ """Add a disk to the DRBD device.
+
+ """
+ if self.minor is None:
+ raise errors.BlockDeviceError("Can't attach to dbrd8 during AddChildren")
+ if len(devices) != 2:
+ raise errors.BlockDeviceError("Need two devices for AddChildren")
+ info = self._GetDevInfo(self._GetShowData(self.minor))
+ if "local_dev" in info:
+ raise errors.BlockDeviceError("DRBD8 already attached to a local disk")
+ backend, meta = devices
+ if backend.dev_path is None or meta.dev_path is None:
+ raise errors.BlockDeviceError("Children not ready during AddChildren")
+ backend.Open()
+ meta.Open()
+ if not self._CheckMetaSize(meta.dev_path):
+ raise errors.BlockDeviceError("Invalid meta device size")
+ self._InitMeta(self._FindUnusedMinor(), meta.dev_path)
+ if not self._IsValidMeta(meta.dev_path):
+ raise errors.BlockDeviceError("Cannot initalize meta device")
+
+ if not self._AssembleLocal(self.minor, backend.dev_path, meta.dev_path):
+ raise errors.BlockDeviceError("Can't attach to local storage")
+ self._children = devices
+
+ def RemoveChildren(self, devices):
+ """Detach the drbd device from local storage.
+
+ """
+ if self.minor is None:
+ raise errors.BlockDeviceError("Can't attach to drbd8 during"
+ " RemoveChildren")
+ # early return if we don't actually have backing storage
+ info = self._GetDevInfo(self._GetShowData(self.minor))
+ if "local_dev" not in info:
+ return
+ if len(self._children) != 2:
+ raise errors.BlockDeviceError("We don't have two children: %s" %
+ self._children)
+ if self._children.count(None) == 2: # we don't actually have children :)
+ logger.Error("Requested detach while detached")
+ return
+ if len(devices) != 2:
+ raise errors.BlockDeviceError("We need two children in RemoveChildren")
+ for child, dev in zip(self._children, devices):
+ if dev != child.dev_path:
+ raise errors.BlockDeviceError("Mismatch in local storage"
+ " (%s != %s) in RemoveChildren" %
+ (dev, child.dev_path))
+
+ if not self._ShutdownLocal(self.minor):
+ raise errors.BlockDeviceError("Can't detach from local storage")
+ self._children = []
+
+ def SetSyncSpeed(self, kbytes):
+ """Set the speed of the DRBD syncer.
+
+ """
+ children_result = super(DRBD8, self).SetSyncSpeed(kbytes)
+ if self.minor is None:
+ logger.Info("Instance not attached to a device")
+ return False
+ result = utils.RunCmd(["drbdsetup", self.dev_path, "syncer", "-r", "%d" %
+ kbytes])
+ if result.failed:
+ logger.Error("Can't change syncer rate: %s " % result.fail_reason)
+ return not result.failed and children_result
+
+ def GetSyncStatus(self):
+ """Returns the sync status of the device.
+
+ Returns:
+ (sync_percent, estimated_time, is_degraded)
+
+ If sync_percent is None, it means all is ok
+ If estimated_time is None, it means we can't esimate
+ 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
+ disk or not.
+
+ """
+ if self.minor is None and not self.Attach():
+ raise errors.BlockDeviceError("Can't attach to device in GetSyncStatus")
+ proc_info = self._MassageProcData(self._GetProcData())
+ if self.minor not in proc_info:
+ raise errors.BlockDeviceError("Can't find myself in /proc (minor %d)" %
+ self.minor)
+ line = proc_info[self.minor]
+ match = re.match("^.*sync'ed: *([0-9.]+)%.*"
+ " finish: ([0-9]+):([0-9]+):([0-9]+) .*$", line)
+ if match:
+ sync_percent = float(match.group(1))
+ hours = int(match.group(2))
+ minutes = int(match.group(3))
+ seconds = int(match.group(4))
+ est_time = hours * 3600 + minutes * 60 + seconds
+ else:
+ sync_percent = None
+ est_time = None
+ match = re.match("^ *\d+: cs:(\w+).*ds:(\w+)/(\w+).*$", line)
+ if not match:
+ raise errors.BlockDeviceError("Can't find my data in /proc (minor %d)" %
+ self.minor)
+ client_state = match.group(1)
+ local_disk_state = match.group(2)
+ ldisk = local_disk_state != "UpToDate"
+ is_degraded = client_state != "Connected"
+ return sync_percent, est_time, is_degraded or ldisk, ldisk
+
+ def Open(self, force=False):
+ """Make the local state primary.
+
+ If the 'force' parameter is given, the '--do-what-I-say' parameter
+ is given. Since this is a pottentialy dangerous operation, the
+ force flag should be only given after creation, when it actually
+ has to be given.
+
+ """
+ if self.minor is None and not self.Attach():
+ logger.Error("DRBD cannot attach to a device during open")
+ return False
+ cmd = ["drbdsetup", self.dev_path, "primary"]
+ if force:
+ cmd.append("-o")
+ result = utils.RunCmd(cmd)
+ if result.failed:
+ msg = ("Can't make drbd device primary: %s" % result.output)
+ logger.Error(msg)
+ raise errors.BlockDeviceError(msg)
+
+ def Close(self):
+ """Make the local state secondary.
+
+ This will, of course, fail if the device is in use.
+
+ """
+ if self.minor is None and not self.Attach():
+ logger.Info("Instance not attached to a device")
+ raise errors.BlockDeviceError("Can't find device")
+ result = utils.RunCmd(["drbdsetup", self.dev_path, "secondary"])
+ if result.failed:
+ msg = ("Can't switch drbd device to"
+ " secondary: %s" % result.output)
+ logger.Error(msg)
+ raise errors.BlockDeviceError(msg)
+
+ def Attach(self):
+ """Find a DRBD device which matches our config and attach to it.
+
+ In case of partially attached (local device matches but no network
+ setup), we perform the network attach. If successful, we re-test
+ the attach if can return success.
+
+ """
+ for minor in self._GetUsedDevs():
+ info = self._GetDevInfo(self._GetShowData(minor))
+ match_l = self._MatchesLocal(info)
+ match_r = self._MatchesNet(info)
+ if match_l and match_r:
+ break
+ if match_l and not match_r and "local_addr" not in info:
+ res_r = self._AssembleNet(minor,
+ (self._lhost, self._lport,
+ self._rhost, self._rport),
+ "C")
+ if res_r:
+ if self._MatchesNet(self._GetDevInfo(self._GetShowData(minor))):
+ break
+ # the weakest case: we find something that is only net attached
+ # even though we were passed some children at init time
+ if match_r and "local_dev" not in info:
+ break
+ if match_l and not match_r and "local_addr" in info:
+ # strange case - the device network part points to somewhere
+ # else, even though its local storage is ours; as we own the
+ # drbd space, we try to disconnect from the remote peer and
+ # reconnect to our correct one
+ if not self._ShutdownNet(minor):
+ raise errors.BlockDeviceError("Device has correct local storage,"
+ " wrong remote peer and is unable to"
+ " disconnect in order to attach to"
+ " the correct peer")
+ # note: _AssembleNet also handles the case when we don't want
+ # local storage (i.e. one or more of the _[lr](host|port) is
+ # None)
+ if (self._AssembleNet(minor, (self._lhost, self._lport,
+ self._rhost, self._rport), "C") and
+ self._MatchesNet(self._GetDevInfo(self._GetShowData(minor)))):
+ break
+
+ else:
+ minor = None
+
+ self._SetFromMinor(minor)
+ return minor is not None
+
+ def Assemble(self):
+ """Assemble the drbd.
+
+ Method:
+ - if we have a local backing device, we bind to it by:
+ - checking the list of used drbd devices
+ - check if the local minor use of any of them is our own device
+ - if yes, abort?
+ - if not, bind
+ - if we have a local/remote net info:
+ - redo the local backing device step for the remote device
+ - check if any drbd device is using the local port,
+ if yes abort
+ - check if any remote drbd device is using the remote
+ port, if yes abort (for now)
+ - bind our net port
+ - bind the remote net port
+
+ """
+ self.Attach()
+ if self.minor is not None:
+ logger.Info("Already assembled")
+ return True
+
+ result = super(DRBD8, self).Assemble()
+ if not result:
+ return result
+
+ minor = self._FindUnusedMinor()
+ need_localdev_teardown = False
+ if self._children and self._children[0] and self._children[1]:
+ result = self._AssembleLocal(minor, self._children[0].dev_path,
+ self._children[1].dev_path)
+ if not result:
+ return False
+ need_localdev_teardown = True
+ if self._lhost and self._lport and self._rhost and self._rport:
+ result = self._AssembleNet(minor,
+ (self._lhost, self._lport,
+ self._rhost, self._rport),
+ "C")
+ if not result:
+ if need_localdev_teardown:
+ # we will ignore failures from this
+ logger.Error("net setup failed, tearing down local device")
+ self._ShutdownAll(minor)
+ return False
+ self._SetFromMinor(minor)
+ return True
+
+ @classmethod
+ def _ShutdownLocal(cls, minor):
+ """Detach from the local device.
+
+ I/Os will continue to be served from the remote device. If we
+ don't have a remote device, this operation will fail.
+
+ """
+ result = utils.RunCmd(["drbdsetup", cls._DevPath(minor), "detach"])
+ if result.failed:
+ logger.Error("Can't detach local device: %s" % result.output)
+ return not result.failed
+
+ @classmethod
+ def _ShutdownNet(cls, minor):
+ """Disconnect from the remote peer.
+
+ This fails if we don't have a local device.
+
+ """
+ result = utils.RunCmd(["drbdsetup", cls._DevPath(minor), "disconnect"])
+ if result.failed:
+ logger.Error("Can't shutdown network: %s" % result.output)
+ return not result.failed
+
+ @classmethod
+ def _ShutdownAll(cls, minor):
+ """Deactivate the device.
+
+ This will, of course, fail if the device is in use.
+
+ """
+ result = utils.RunCmd(["drbdsetup", cls._DevPath(minor), "down"])
+ if result.failed:
+ logger.Error("Can't shutdown drbd device: %s" % result.output)
+ return not result.failed
+
+ def Shutdown(self):
+ """Shutdown the DRBD device.
+
+ """
+ if self.minor is None and not self.Attach():
+ logger.Info("DRBD device not attached to a device during Shutdown")
+ return True
+ if not self._ShutdownAll(self.minor):
+ return False
+ self.minor = None
+ self.dev_path = None
+ return True
+
+ def Remove(self):
+ """Stub remove for DRBD devices.
+
+ """
+ return self.Shutdown()
+
+ @classmethod
+ def Create(cls, unique_id, children, size):
+ """Create a new DRBD8 device.
+
+ Since DRBD devices are not created per se, just assembled, this
+ function only initializes the metadata.
+
+ """
+ if len(children) != 2:
+ raise errors.ProgrammerError("Invalid setup for the drbd device")
+ meta = children[1]
+ meta.Assemble()
+ if not meta.Attach():
+ raise errors.BlockDeviceError("Can't attach to meta device")
+ if not cls._CheckMetaSize(meta.dev_path):
+ raise errors.BlockDeviceError("Invalid meta device size")
+ cls._InitMeta(cls._FindUnusedMinor(), meta.dev_path)
+ if not cls._IsValidMeta(meta.dev_path):
+ raise errors.BlockDeviceError("Cannot initalize meta device")
+ return cls(unique_id, children)
+
+
+class FileStorage(BlockDev):
+ """File device.
+
+ This class represents the a file storage backend device.
+
+ The unique_id for the file device is a (file_driver, file_path) tuple.
+
+ """
+ def __init__(self, unique_id, children):
+ """Initalizes a file device backend.
+
+ """
+ if children:
+ raise errors.BlockDeviceError("Invalid setup for file device")
+ super(FileStorage, self).__init__(unique_id, children)
+ if not isinstance(unique_id, (tuple, list)) or len(unique_id) != 2:
+ raise ValueError("Invalid configuration data %s" % str(unique_id))
+ self.driver = unique_id[0]
+ self.dev_path = unique_id[1]
+
+ def Assemble(self):
+ """Assemble the device.
+
+ Checks whether the file device exists, raises BlockDeviceError otherwise.
+
+ """
+ if not os.path.exists(self.dev_path):
+ raise errors.BlockDeviceError("File device '%s' does not exist." %
+ self.dev_path)
+ return True
+
+ def Shutdown(self):
+ """Shutdown the device.
+
+ This is a no-op for the file type, as we don't deacivate
+ the file on shutdown.
+
+ """
+ return True
+
+ def Open(self, force=False):
+ """Make the device ready for I/O.
+
+ This is a no-op for the file type.
+
+ """
+ pass
+
+ def Close(self):
+ """Notifies that the device will no longer be used for I/O.
+
+ This is a no-op for the file type.
+
+ """
+ pass
+
+ def Remove(self):
+ """Remove the file backing the block device.
+
+ Returns:
+ boolean indicating wheter removal of file was successful or not.
+
+ """
+ if not os.path.exists(self.dev_path):
+ return True
+ try:
+ os.remove(self.dev_path)
+ return True
+ except OSError, err:
+ logger.Error("Can't remove file '%s': %s"
+ % (self.dev_path, err))
+ return False
+
+ def Attach(self):
+ """Attach to an existing file.
+
+ Check if this file already exists.
+
+ Returns:
+ boolean indicating if file exists or not.
+
+ """
+ if os.path.exists(self.dev_path):
+ return True
+ return False
+
+ @classmethod
+ def Create(cls, unique_id, children, size):
+ """Create a new file.
+
+ Args:
+ children:
+ size: integer size of file in MiB
+
+ Returns:
+ A ganeti.bdev.FileStorage object.
+
+ """
+ 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]
+ try:
+ f = open(dev_path, 'w')
+ except IOError, err:
+ raise BlockDeviceError("Could not create '%'" % err)
+ else:
+ f.truncate(size * 1024 * 1024)
+ f.close()
+
+ return FileStorage(unique_id, children)
+
+
+DEV_MAP = {
+ constants.LD_LV: LogicalVolume,
+ constants.LD_MD_R1: MDRaid1,
+ constants.LD_DRBD7: DRBDev,
+ constants.LD_DRBD8: DRBD8,
+ constants.LD_FILE: FileStorage,
+ }
+
+
+def FindDevice(dev_type, unique_id, children):
"""Search for an existing, assembled device.
This will succeed only if the device exists and is assembled, but it
device = DEV_MAP[dev_type](unique_id, children)
if not device.Attach():
device.Assemble()
- if not device.Attach():
- raise errors.BlockDeviceError("Can't find a valid block device for"
- " %s/%s/%s" %
- (dev_type, unique_id, children))
+ if not device.Attach():
+ raise errors.BlockDeviceError("Can't find a valid block device for"
+ " %s/%s/%s" %
+ (dev_type, unique_id, children))
return device
projects / ganeti-local / blobdiff