Commit b00b95dd authored by Iustin Pop's avatar Iustin Pop
Browse files

Allow drbd8 devices to work without local storage

This patch adds functionality to drbd8 for:
  - removing local storage
  - initializing without local storage
  - adding local storage

This is needed for the being able to replace disks for drbd8.

Reviewed-by: imsnah
parent f3e513ad
......@@ -1628,7 +1628,7 @@ class DRBD8(BaseDRBD):
" requested ganeti usage: kernel is"
" %s.%s, ganeti wants 8.x" % (kmaj, kmin))
if len(children) != 2:
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))
......@@ -1794,15 +1794,21 @@ class DRBD8(BaseDRBD):
device.
"""
backend = self._children[0]
if self._children:
backend, meta = self._children
else:
backend = meta = None
if backend is not None:
retval = (info["local_dev"] == backend.dev_path)
retval = ("local_dev" in info and info["local_dev"] == backend.dev_path)
else:
retval = ("local_dev" not in info)
meta = self._children[1]
if meta is not None:
retval = retval and (info["meta_dev"] == meta.dev_path)
retval = retval and (info["meta_index"] == 0)
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)
......@@ -1890,6 +1896,54 @@ class DRBD8(BaseDRBD):
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")
if self._children:
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")
if len(self._children) != 2:
raise errors.BlockDeviceError("We don't have two children: %s" %
self._children)
if len(devices) != 2:
raise errors.BlockDeviceError("We need two children in RemoveChildren")
for idx, dev in enumerate(devices):
if dev.dev_path != self._children[idx].dev_path:
raise errors.BlockDeviceError("Mismatch in local storage (%d) in"
" RemoveChildren" % idx)
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.
......@@ -2081,6 +2135,19 @@ class DRBD8(BaseDRBD):
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.
......
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