# # # Copyright (C) 2006, 2007 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 # the Free Software Foundation; either version 2 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, but # WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU # General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program; if not, write to the Free Software # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA # 02110-1301, USA. """Block device abstraction""" import re import time import errno import pyparsing as pyp from ganeti import utils from ganeti import logger from ganeti import errors from ganeti import constants class BlockDev(object): """Block device abstract class. A block device can be in the following states: - not existing on the system, and by `Create()` it goes into: - existing but not setup/not active, and by `Assemble()` goes into: - active read-write and by `Open()` it goes into - online (=used, or ready for use) A device can also be online but read-only, however we are not using the readonly state (MD and LV have it, if needed in the future) and we are usually looking at this like at a stack, so it's easier to conceptualise the transition from not-existing to online and back like a linear one. The many different states of the device are due to the fact that we need to cover many device types: - logical volumes are created, lvchange -a y $lv, and used - 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) - it's major/minor pair (dynamic) Not all devices implement both the first two as distinct items. LVM logical volumes have their unique ID (the pair volume group, logical volume name) in a 1-to-1 relation to the dev path. For MD devices, the /dev path is dynamic and the unique ID is the UUID generated at array creation plus the slave list. For DRBD devices, the /dev path is again dynamic and the unique id is the pair (host1, dev1), (host2, dev2). You can get to a device in two ways: - creating the (real) device, which returns you an attached instance (lvcreate, mdadm --create) - attaching of a python instance to an existing (real) device The second point, the attachement to a device, is different depending on whether the device is assembled or not. At init() time, we search for a device with the same unique_id as us. If found, good. It also means that the device is already assembled. If not, 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.unique_id = unique_id self.major = None self.minor = None def Assemble(self): """Assemble the device from its components. If this is a plain block device (e.g. LVM) than assemble does nothing, as the LVM has no children and we don't put logical volumes offline. One guarantee is that after the device has been assembled, it knows its major/minor numbers. This allows other devices (usually parents) to probe correctly for their children. """ status = True for child in self._children: if not isinstance(child, BlockDev): raise TypeError("Invalid child passed of type '%s'" % type(child)) if not status: break status = status and child.Assemble() if not status: break status = status and child.Open() 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. If the device cannot be created, it will return None instead. Error messages go to the logging system. Note that for some devices, the unique_id is used, and for other, the children. The idea is that these two, taken together, are enough for both creation and assembly (later). """ raise NotImplementedError def Remove(self): """Remove this device. This makes sense only for some of the device types: LV and to a lesser degree, md devices. Also note that if the device can't attach, the removal can't be completed. """ raise NotImplementedError def GetStatus(self): """Return the status of the device. """ raise NotImplementedError def Open(self, force=False): """Make the device ready for use. This makes the device ready for I/O. For now, just the DRBD devices need this. The force parameter signifies that if the device has any kind of --force thing, it should be used, we know what we are doing. """ raise NotImplementedError def Shutdown(self): """Shut down the device, freeing its children. This undoes the `Assemble()` work, except for the child assembling; as such, the children on the device are still assembled after this call. """ raise NotImplementedError def SetSyncSpeed(self, speed): """Adjust the sync speed of the mirror. In case this is not a mirroring device, this is no-op. """ result = True if self._children: for child in self._children: result = result and child.SetSyncSpeed(speed) return result 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) 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 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. """ return None, None, False def CombinedSyncStatus(self): """Calculate the mirror status recursively for our children. The return value is the same as for `GetSyncStatus()` except the minimum percent and maximum time are calculated across our children. """ min_percent, max_time, is_degraded = self.GetSyncStatus() if self._children: for child in self._children: c_percent, c_time, c_degraded = child.GetSyncStatus() if min_percent is None: min_percent = c_percent elif c_percent is not None: min_percent = min(min_percent, c_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 return min_percent, max_time, is_degraded def SetInfo(self, text): """Update metadata with info text. Only supported for some device types. """ for child in self._children: child.SetInfo(text) def __repr__(self): return ("<%s: unique_id: %s, children: %s, %s:%s, %s>" % (self.__class__, self.unique_id, self._children, self.major, self.minor, self.dev_path)) class LogicalVolume(BlockDev): """Logical Volume block device. """ def __init__(self, unique_id, children): """Attaches to a LV device. The unique_id is a tuple (vg_name, lv_name) """ super(LogicalVolume, 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._vg_name, self._lv_name = unique_id 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. """ if not isinstance(unique_id, (tuple, list)) or len(unique_id) != 2: raise ValueError("Invalid configuration data %s" % str(unique_id)) vg_name, lv_name = unique_id pvs_info = cls.GetPVInfo(vg_name) if not pvs_info: raise errors.BlockDeviceError("Can't compute PV info for vg %s" % vg_name) pvs_info.sort() pvs_info.reverse() pvlist = [ pv[1] for pv in pvs_info ] free_size = sum([ pv[0] for pv in pvs_info ]) # The size constraint should have been checked from the master before # calling the create function. if free_size < size: raise errors.BlockDeviceError("Not enough free space: required %s," " available %s" % (size, free_size)) result = utils.RunCmd(["lvcreate", "-L%dm" % size, "-n%s" % lv_name, vg_name] + pvlist) if result.failed: raise errors.BlockDeviceError(result.fail_reason) return LogicalVolume(unique_id, children) @staticmethod def GetPVInfo(vg_name): """Get the free space info for PVs in a volume group. Args: vg_name: the volume group name Returns: list of (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: logger.Error("Can't get the PV information: %s" % result.fail_reason) return None data = [] for line in result.stdout.splitlines(): fields = line.strip().split(':') if len(fields) != 4: logger.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': continue data.append((float(fields[2]), fields[0])) return data def Remove(self): """Remove this logical volume. """ if not self.minor and not self.Attach(): # the LV does not exist return True result = utils.RunCmd(["lvremove", "-f", "%s/%s" % (self._vg_name, self._lv_name)]) if result.failed: logger.Error("Can't lvremove: %s" % result.fail_reason) return not result.failed 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 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)) return False match = re.compile("^ *Block device *([0-9]+):([0-9]+).*$") for line in result.stdout.splitlines(): match_result = match.match(line) if match_result: self.major = int(match_result.group(1)) self.minor = int(match_result.group(2)) 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. """ return True def Shutdown(self): """Shutdown the device. This is a no-op for the LV device type, as we don't deactivate the volumes on shutdown. """ return True def GetStatus(self): """Return the status of the device. 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. """ 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 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 def Open(self, force=False): """Make the device ready for I/O. This is a no-op for the LV device type. """ return True 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 def Snapshot(self, size): """Create a snapshot copy of an lvm block device. """ snap_name = self._lv_name + ".snap" # remove existing snapshot if found snap = LogicalVolume((self._vg_name, snap_name), None) snap.Remove() pvs_info = self.GetPVInfo(self._vg_name) if not pvs_info: raise errors.BlockDeviceError("Can't compute PV info for vg %s" % self._vg_name) pvs_info.sort() pvs_info.reverse() free_size, pv_name = pvs_info[0] if free_size < size: raise errors.BlockDeviceError("Not enough free space: required %s," " available %s" % (size, free_size)) result = utils.RunCmd(["lvcreate", "-L%dm" % size, "-s", "-n%s" % snap_name, self.dev_path]) if result.failed: raise errors.BlockDeviceError("command: %s error: %s" % (result.cmd, result.fail_reason)) return 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) # Only up to 128 characters are allowed text = text[:128] result = utils.RunCmd(["lvchange", "--addtag", text, self.dev_path]) if result.failed: raise errors.BlockDeviceError("Command: %s error: %s" % (result.cmd, result.fail_reason)) class MDRaid1(BlockDev): """raid1 device implemented via md. """ def __init__(self, unique_id, children): super(MDRaid1, self).__init__(unique_id, children) self.major = 9 self.Attach() def Attach(self): """Find an array which matches our config and attach to it. This tries to find a MD array which has the same UUID as our own. """ minor = self._FindMDByUUID(self.unique_id) if minor is not None: self._SetFromMinor(minor) else: self.minor = None self.dev_path = None return (minor is not None) @staticmethod def _GetUsedDevs(): """Compute the list of in-use MD devices. It doesn't matter if the used device have other raid level, just that they are in use. """ mdstat = open("/proc/mdstat", "r") data = mdstat.readlines() mdstat.close() used_md = {} valid_line = re.compile("^md([0-9]+) : .*$") for line in data: match = valid_line.match(line) if match: md_no = int(match.group(1)) used_md[md_no] = line return used_md @staticmethod def _GetDevInfo(minor): """Get info about a MD device. Currently only uuid is returned. """ result = utils.RunCmd(["mdadm", "-D", "/dev/md%d" % minor]) if result.failed: logger.Error("Can't display md: %s" % result.fail_reason) return None retval = {} for line in result.stdout.splitlines(): line = line.strip() kv = line.split(" : ", 1) if kv: if kv[0] == "UUID": retval["uuid"] = kv[1].split()[0] elif kv[0] == "State": retval["state"] = kv[1].split(", ") return retval @staticmethod def _FindUnusedMinor(): """Compute an unused MD minor. This code assumes that there are 256 minors only. """ used_md = MDRaid1._GetUsedDevs() i = 0 while i < 256: if i not in used_md: break i += 1 if i == 256: logger.Error("Critical: Out of md minor numbers.") 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. """ md_list = cls._GetUsedDevs() for minor in md_list: info = cls._GetDevInfo(minor) if info and info["uuid"] == uuid: return minor return None @staticmethod def _ZeroSuperblock(dev_path): """Zero the possible locations for an MD superblock. The zero-ing can't be done via ``mdadm --zero-superblock`` as that fails in versions 2.x with the same error code as non-writable device. The superblocks are located at (negative values are relative to the end of the block device): - -128k to end for version 0.90 superblock - -8k to -12k for version 1.0 superblock (included in the above) - 0k to 4k for version 1.1 superblock - 4k to 8k for version 1.2 superblock To cover all situations, the zero-ing will be: - 0k to 128k - -128k to end As such, the minimum device size must be 128k, otherwise we'll get I/O errors. Note that this function depends on the fact that one can open, read and write block devices normally. """ overwrite_size = 128 * 1024 empty_buf = '\0' * overwrite_size fd = open(dev_path, "r+") try: fd.seek(0, 0) p1 = fd.tell() fd.write(empty_buf) p2 = fd.tell() logger.Debug("Zeroed %s from %d to %d" % (dev_path, p1, p2)) fd.seek(-overwrite_size, 2) p1 = fd.tell() fd.write(empty_buf) p2 = fd.tell() logger.Debug("Zeroed %s from %d to %d" % (dev_path, p1, p2)) finally: fd.close() @classmethod def Create(cls, unique_id, children, size): """Create a new MD raid1 array. """ if not isinstance(children, (tuple, list)): raise ValueError("Invalid setup data for MDRaid1 dev: %s" % str(children)) for i in children: if not isinstance(i, BlockDev): raise ValueError("Invalid member in MDRaid1 dev: %s" % type(i)) for i in children: try: cls._ZeroSuperblock(i.dev_path) except EnvironmentError, err: logger.Error("Can't zero superblock for %s: %s" % (i.dev_path, str(err))) return None minor = cls._FindUnusedMinor() result = utils.RunCmd(["mdadm", "--create", "/dev/md%d" % minor, "--auto=yes", "--force", "-l1", "-n%d" % len(children)] + [dev.dev_path for dev in children]) if result.failed: logger.Error("Can't create md: %s: %s" % (result.fail_reason, result.output)) return None info = cls._GetDevInfo(minor) if not info or not "uuid" in info: logger.Error("Wrong information returned from mdadm -D: %s" % str(info)) return None return MDRaid1(info["uuid"], children) def Remove(self): """Stub remove function for MD RAID 1 arrays. We don't remove the superblock right now. Mark a to do. """ #TODO: maybe zero superblock on child devices? return self.Shutdown() def AddChild(self, device): """Add a new member 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]) if result.failed: raise errors.BlockDeviceError("Failed to add new device to array: %s" % result.output) new_len = len(self._children) + 1 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) def RemoveChild(self, dev_path): """Remove member 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]) if result.failed: raise errors.BlockDeviceError("Failed to mark device 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]) if result.failed: raise errors.BlockDeviceError("Failed to remove device 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 def _SetFromMinor(self, minor): """Set our parameters based on the given minor. This sets our minor variable and our dev_path. """ self.minor = minor self.dev_path = "/dev/md%d" % minor def Assemble(self): """Assemble the MD device. At this point we should have: - list of children devices - uuid """ result = super(MDRaid1, self).Assemble() if not result: return result md_list = self._GetUsedDevs() for minor in md_list: info = self._GetDevInfo(minor) if info and info["uuid"] == self.unique_id: self._SetFromMinor(minor) logger.Info("MD array %s already started" % str(self)) return True free_minor = self._FindUnusedMinor() result = utils.RunCmd(["mdadm", "-A", "--auto=yes", "--uuid", self.unique_id, "/dev/md%d" % free_minor] + [bdev.dev_path for bdev in self._children]) if result.failed: logger.Error("Can't assemble MD array: %s: %s" % (result.fail_reason, result.output)) self.minor = None else: self.minor = free_minor return not result.failed def Shutdown(self): """Tear down the MD array. This does a 'mdadm --stop' so after this command, the array is no longer available. """ if self.minor is None and not self.Attach(): logger.Info("MD object not attached to a device") return True result = utils.RunCmd(["mdadm", "--stop", "/dev/md%d" % self.minor]) if result.failed: logger.Error("Can't stop MD array: %s" % result.fail_reason) return False self.minor = None self.dev_path = None return True def SetSyncSpeed(self, kbytes): """Set the maximum sync speed for the MD array. """ result = super(MDRaid1, self).SetSyncSpeed(kbytes) if self.minor is None: logger.Error("MD array not attached to a device") return False f = open("/sys/block/md%d/md/sync_speed_max" % self.minor, "w") try: f.write("%d" % kbytes) finally: f.close() f = open("/sys/block/md%d/md/sync_speed_min" % self.minor, "w") try: f.write("%d" % (kbytes/2)) finally: f.close() return result def GetSyncStatus(self): """Returns the sync status of the device. Returns: (sync_percent, estimated_time) 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 """ if self.minor is None and not self.Attach(): raise errors.BlockDeviceError("Can't attach to device in GetSyncStatus") dev_info = self._GetDevInfo(self.minor) is_clean = ("state" in dev_info and len(dev_info["state"]) == 1 and dev_info["state"][0] in ("clean", "active")) sys_path = "/sys/block/md%s/md/" % self.minor f = file(sys_path + "sync_action") sync_status = f.readline().strip() f.close() if sync_status == "idle": return None, None, not is_clean 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 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") sync_speed_k = int(f.readline().strip()) if sync_speed_k == 0: time_est = None else: time_est = (sync_total - sync_done) / 2 / sync_speed_k return sync_percent, time_est, not is_clean def Open(self, force=False): """Make the device ready for I/O. This is a no-op for the MDRaid1 device type, although we could use the 2.6.18's new array_state thing. """ return True def Close(self): """Notifies that the device will no longer be used for I/O. This is a no-op for the MDRaid1 device type, but see comment for `Open()`. """ return True class BaseDRBD(BlockDev): """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+)" r" \(api:(\d+)/proto:(\d+)\)") _DRBD_MAJOR = 147 _ST_UNCONFIGURED = "Unconfigured" _ST_WFCONNECTION = "WFConnection" _ST_CONNECTED = "Connected" @staticmethod def _GetProcData(): """Return data from /proc/drbd. """ stat = open("/proc/drbd", "r") try: data = stat.read().splitlines() finally: stat.close() if not data: 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]+):.*$") results = {} old_minor = old_line = None for line in data: lresult = lmatch.match(line) if lresult is not None: if old_minor is not None: results[old_minor] = old_line old_minor = int(lresult.group(1)) old_line = line else: if old_minor is not None: old_line += " " + line.strip() # add last line if old_minor is not None: results[old_minor] = old_line return results @classmethod def _GetVersion(cls): """Return the DRBD version. This will return a list [k_major, k_minor, k_point, api, proto]. """ proc_data = cls._GetProcData() first_line = proc_data[0].strip() version = cls._VERSION_RE.match(first_line) if not version: raise errors.BlockDeviceError("Can't parse DRBD version from '%s'" % first_line) return [int(val) for val in version.groups()] @staticmethod def _DevPath(minor): """Return the path to a drbd device for a given minor. """ return "/dev/drbd%d" % minor @classmethod def _GetUsedDevs(cls): """Compute the list of used DRBD devices. """ data = cls._GetProcData() used_devs = {} valid_line = re.compile("^ *([0-9]+): cs:([^ ]+).*$") for line in data: match = valid_line.match(line) if not match: continue minor = int(match.group(1)) state = match.group(2) if state == cls._ST_UNCONFIGURED: continue used_devs[minor] = state, line 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 class DRBDev(BaseDRBD): """DRBD block device. 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. """ 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: raise errors.BlockDeviceError("Mismatch in DRBD kernel version and" " requested ganeti usage: kernel is" " %s.%s, ganeti wants 0.7" % (kmaj, kmin)) if len(children) != 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 _FindUnusedMinor(cls): """Find an unused DRBD device. """ data = cls._GetProcData() valid_line = re.compile("^ *([0-9]+): cs:Unconfigured$") for line in data: match = valid_line.match(line) if match: return int(match.group(1)) logger.Error("Error: no free drbd minors!") raise errors.BlockDeviceError("Can't find a free DRBD minor") @classmethod def _GetDevInfo(cls, minor): """Get details about a given DRBD minor. This return, if available, the local backing device in (major, minor) formant and the local and remote (ip, port) information. """ data = {} result = utils.RunCmd(["drbdsetup", cls._DevPath(minor), "show"]) if result.failed: logger.Error("Can't display the drbd config: %s" % result.fail_reason) return data out = result.stdout if out == "Not configured\n": return data for line in out.splitlines(): if "local_dev" not in data: match = re.match("^Lower device: ([0-9]+):([0-9]+) .*$", line) if match: data["local_dev"] = (int(match.group(1)), int(match.group(2))) continue if "meta_dev" not in data: match = re.match("^Meta device: (([0-9]+):([0-9]+)|internal).*$", line) if match: if match.group(2) is not None and match.group(3) is not None: # matched on the major/minor data["meta_dev"] = (int(match.group(2)), int(match.group(3))) else: # matched on the "internal" string data["meta_dev"] = match.group(1) # in this case, no meta_index is in the output data["meta_index"] = -1 continue if "meta_index" not in data: match = re.match("^Meta index: ([0-9]+).*$", line) if match: data["meta_index"] = int(match.group(1)) continue if "local_addr" not in data: match = re.match("^Local address: ([0-9.]+):([0-9]+)$", line) if match: data["local_addr"] = (match.group(1), int(match.group(2))) continue if "remote_addr" not in data: match = re.match("^Remote address: ([0-9.]+):([0-9]+)$", line) if match: data["remote_addr"] = (match.group(1), int(match.group(2))) continue 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 not ("local_dev" in info and "meta_dev" in info and "meta_index" in info): return False backend = self._children[0] if backend is not None: retval = (info["local_dev"] == (backend.major, backend.minor)) else: retval = (info["local_dev"] == (0, 0)) meta = self._children[1] if meta is not None: retval = retval and (info["meta_dev"] == (meta.major, meta.minor)) retval = retval and (info["meta_index"] == 0) else: retval = retval and (info["meta_dev"] == "internal" and info["meta_index"] == -1) 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._CheckMetaSize(meta): return False result = utils.RunCmd(["drbdsetup", cls._DevPath(minor), "disk", backend, meta, "0", "-e", "detach"]) if result.failed: logger.Error("Can't attach local disk: %s" % result.output) return not result.failed @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 @staticmethod def _ShutdownAll(minor): """Deactivate the device. This will, of course, fail if the device is in use. """ result = utils.RunCmd(["drbdsetup", DRBDev._DevPath(minor), "down"]) if result.failed: 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. This operation can be, in theory, done multiple times, but there have been cases (in lab testing) in which the network part of the device had become stuck and couldn't be shut down because activity from the new peer (also stuck) triggered a timer re-init and needed remote peer interface shutdown in order to clear. So please don't change online the net config. """ lhost, lport, rhost, rport = net_info result = utils.RunCmd(["drbdsetup", cls._DevPath(minor), "net", "%s:%s" % (lhost, lport), "%s:%s" % (rhost, rport), protocol]) 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(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 @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"]) logger.Error("Can't shutdown network: %s" % result.output) return not result.failed 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(DRBDev, self).Assemble() if not result: return result minor = self._FindUnusedMinor() need_localdev_teardown = False if self._children[0]: 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 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 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(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 and self._MatchesNet(self._GetDevInfo(minor)): break else: minor = None self._SetFromMinor(minor) return minor is not None 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("--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 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: logger.Error("Can't switch drbd device to secondary: %s" % result.output) raise errors.BlockDeviceError("Can't switch drbd device to secondary") def SetSyncSpeed(self, kbytes): """Set the speed of the DRBD syncer. """ children_result = super(DRBDev, 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) 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 """ 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]+) .*$", line) if match: sync_percent = float(match.group(1)) hours = int(match.group(2)) minutes = int(match.group(3)) seconds = int(match.group(4)) est_time = hours * 3600 + minutes * 60 + seconds else: sync_percent = None est_time = None match = re.match("^ *[0-9]+: cs:([^ ]+).*$", line) if not match: raise errors.BlockDeviceError("Can't find my data in /proc (minor %d)" % self.minor) client_state = match.group(1) is_degraded = client_state != "Connected" return sync_percent, est_time, is_degraded 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 @staticmethod def _ZeroDevice(device): """Zero a device. This writes until we get ENOSPC. """ f = open(device, "w") buf = "\0" * 1048576 try: while True: f.write(buf) except IOError, err: if err.errno != errno.ENOSPC: raise @classmethod def Create(cls, unique_id, children, size): """Create a new DRBD device. Since DRBD devices are not created per se, just assembled, this function just zeroes the meta device. """ 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") 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() class DRBD8(BaseDRBD): """DRBD v8.x block device. 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. """ _DRBD_MAJOR = 147 _MAX_MINORS = 255 _PARSE_SHOW = None def __init__(self, unique_id, children): super(DRBD8, self).__init__(unique_id, children) self.major = self._DRBD_MAJOR [kmaj, kmin, kfix, api, proto] = self._GetVersion() if kmaj != 8: raise errors.BlockDeviceError("Mismatch in DRBD kernel version and" " requested ganeti usage: kernel is" " %s.%s, ganeti wants 8.x" % (kmaj, kmin)) if len(children) != 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:(l, [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 _GetDevInfo(cls, minor): """Get 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. """ data = {} result = utils.RunCmd(["drbdsetup", cls._DevPath(minor), "show"]) if result.failed: logger.Error("Can't display the drbd config: %s" % result.fail_reason) return data out = result.stdout 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. """ backend = self._children[0] if backend is not None: retval = (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) 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 args = ["drbdsetup", cls._DevPath(minor), "net", "%s:%s" % (lhost, lport), "%s:%s" % (rhost, rport), protocol] 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(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 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) 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 """ 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]+) .*$", line) if match: sync_percent = float(match.group(1)) hours = int(match.group(2)) minutes = int(match.group(3)) seconds = int(match.group(4)) est_time = hours * 3600 + minutes * 60 + seconds else: sync_percent = None est_time = None match = re.match("^ *[0-9]+: cs:([^ ]+).*$", line) if not match: raise errors.BlockDeviceError("Can't find my data in /proc (minor %d)" % self.minor) client_state = match.group(1) is_degraded = client_state != "Connected" return sync_percent, est_time, is_degraded 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 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: logger.Error("Can't make drbd device primary: %s" % result.output) return False return True 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: logger.Error("Can't switch drbd device to secondary: %s" % result.output) raise errors.BlockDeviceError("Can't switch drbd device to secondary") 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(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 and self._MatchesNet(self._GetDevInfo(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[0]: 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 _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) DEV_MAP = { constants.LD_LV: LogicalVolume, constants.LD_MD_R1: MDRaid1, constants.LD_DRBD7: DRBDev, } 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 does not do any actions in order to activate the device. """ if dev_type not in DEV_MAP: raise errors.ProgrammerError("Invalid block device type '%s'" % dev_type) device = DEV_MAP[dev_type](unique_id, children) if not device.Attach(): return None return device def AttachOrAssemble(dev_type, unique_id, children): """Try to attach or assemble an existing device. This will attach to an existing assembled device or will assemble the device, as needed, to bring it fully up. """ if dev_type not in DEV_MAP: raise errors.ProgrammerError("Invalid block device type '%s'" % dev_type) 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)) return device def Create(dev_type, unique_id, children, size): """Create a device. """ if dev_type not in DEV_MAP: raise errors.ProgrammerError("Invalid block device type '%s'" % dev_type) device = DEV_MAP[dev_type].Create(unique_id, children, size) return device