X-Git-Url: https://code.grnet.gr/git/ganeti-local/blobdiff_plain/cb7c019826d8acb1942f6845d0c65c5dfb2aa841..18e4dee6616b197a215de6c676800da328836e48:/lib/bdev.py?ds=sidebyside diff --git a/lib/bdev.py b/lib/bdev.py index deb54f9..5cf45c9 100644 --- a/lib/bdev.py +++ b/lib/bdev.py @@ -1,7 +1,7 @@ # # -# Copyright (C) 2006, 2007 Google Inc. +# Copyright (C) 2006, 2007, 2010, 2011 Google Inc. # # This program is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by @@ -24,6 +24,7 @@ import re import time import errno +import stat import pyparsing as pyp import os import logging @@ -32,6 +33,8 @@ from ganeti import utils from ganeti import errors from ganeti import constants from ganeti import objects +from ganeti import compat +from ganeti import netutils # Size of reads in _CanReadDevice @@ -228,6 +231,20 @@ class BlockDev(object): result = result and child.SetSyncSpeed(speed) return result + def PauseResumeSync(self, pause): + """Pause/Resume the sync of the mirror. + + In case this is not a mirroring device, this is no-op. + + @param pause: Wheater to pause or resume + + """ + result = True + if self._children: + for child in self._children: + result = result and child.PauseResumeSync(pause) + return result + def GetSyncStatus(self): """Returns the sync status of the device. @@ -314,10 +331,14 @@ class BlockDev(object): for child in self._children: child.SetInfo(text) - def Grow(self, amount): + def Grow(self, amount, dryrun): """Grow the block device. + @type amount: integer @param amount: the amount (in mebibytes) to grow with + @type dryrun: boolean + @param dryrun: whether to execute the operation in simulation mode + only, without actually increasing the size """ raise NotImplementedError @@ -349,6 +370,10 @@ class LogicalVolume(BlockDev): """Logical Volume block device. """ + _VALID_NAME_RE = re.compile("^[a-zA-Z0-9+_.-]*$") + _INVALID_NAMES = frozenset([".", "..", "snapshot", "pvmove"]) + _INVALID_SUBSTRINGS = frozenset(["_mlog", "_mimage"]) + def __init__(self, unique_id, children, size): """Attaches to a LV device. @@ -359,7 +384,9 @@ class LogicalVolume(BlockDev): if not isinstance(unique_id, (tuple, list)) or len(unique_id) != 2: raise ValueError("Invalid configuration data %s" % str(unique_id)) self._vg_name, self._lv_name = unique_id - self.dev_path = "/dev/%s/%s" % (self._vg_name, self._lv_name) + self._ValidateName(self._vg_name) + self._ValidateName(self._lv_name) + self.dev_path = utils.PathJoin("/dev", self._vg_name, self._lv_name) self._degraded = True self.major = self.minor = self.pe_size = self.stripe_count = None self.Attach() @@ -373,6 +400,8 @@ class LogicalVolume(BlockDev): raise errors.ProgrammerError("Invalid configuration data %s" % str(unique_id)) vg_name, lv_name = unique_id + cls._ValidateName(vg_name) + cls._ValidateName(lv_name) pvs_info = cls.GetPVInfo([vg_name]) if not pvs_info: _ThrowError("Can't compute PV info for vg %s", vg_name) @@ -380,9 +409,10 @@ class LogicalVolume(BlockDev): pvs_info.reverse() pvlist = [ pv[1] for pv in pvs_info ] - if utils.any(pvlist, lambda v: ":" in v): - _ThrowError("Some of your PVs have invalid character ':'" - " in their name") + if compat.any(":" in v for v in pvlist): + _ThrowError("Some of your PVs have the invalid character ':' in their" + " name, this is not supported - please filter them out" + " in lvm.conf using either 'filter' or 'preferred_names'") free_size = sum([ pv[0] for pv in pvs_info ]) current_pvs = len(pvlist) stripes = min(current_pvs, constants.LVM_STRIPECOUNT) @@ -407,7 +437,40 @@ class LogicalVolume(BlockDev): return LogicalVolume(unique_id, children, size) @staticmethod - def GetPVInfo(vg_names, filter_allocatable=True): + def _GetVolumeInfo(lvm_cmd, fields): + """Returns LVM Volumen infos using lvm_cmd + + @param lvm_cmd: Should be one of "pvs", "vgs" or "lvs" + @param fields: Fields to return + @return: A list of dicts each with the parsed fields + + """ + if not fields: + raise errors.ProgrammerError("No fields specified") + + sep = "|" + cmd = [lvm_cmd, "--noheadings", "--nosuffix", "--units=m", "--unbuffered", + "--separator=%s" % sep, "-o%s" % ",".join(fields)] + + result = utils.RunCmd(cmd) + if result.failed: + raise errors.CommandError("Can't get the volume information: %s - %s" % + (result.fail_reason, result.output)) + + data = [] + for line in result.stdout.splitlines(): + splitted_fields = line.strip().split(sep) + + if len(fields) != len(splitted_fields): + raise errors.CommandError("Can't parse %s output: line '%s'" % + (lvm_cmd, line)) + + data.append(splitted_fields) + + return data + + @classmethod + def GetPVInfo(cls, vg_names, filter_allocatable=True): """Get the free space info for PVs in a volume group. @param vg_names: list of volume group names, if empty all will be returned @@ -417,31 +480,70 @@ class LogicalVolume(BlockDev): @return: list of tuples (free_space, name) with free_space in mebibytes """ - sep = "|" - command = ["pvs", "--noheadings", "--nosuffix", "--units=m", - "-opv_name,vg_name,pv_free,pv_attr", "--unbuffered", - "--separator=%s" % sep ] - result = utils.RunCmd(command) - if result.failed: - logging.error("Can't get the PV information: %s - %s", - result.fail_reason, result.output) + try: + info = cls._GetVolumeInfo("pvs", ["pv_name", "vg_name", "pv_free", + "pv_attr"]) + except errors.GenericError, err: + logging.error("Can't get PV information: %s", err) return None + data = [] - for line in result.stdout.splitlines(): - fields = line.strip().split(sep) - if len(fields) != 4: - logging.error("Can't parse pvs output: line '%s'", line) - return None + for pv_name, vg_name, pv_free, pv_attr in info: # (possibly) skip over pvs which are not allocatable - if filter_allocatable and fields[3][0] != 'a': + if filter_allocatable and pv_attr[0] != "a": continue # (possibly) skip over pvs which are not in the right volume group(s) - if vg_names and fields[1] not in vg_names: + if vg_names and vg_name not in vg_names: + continue + data.append((float(pv_free), pv_name, vg_name)) + + return data + + @classmethod + def GetVGInfo(cls, vg_names, filter_readonly=True): + """Get the free space info for specific VGs. + + @param vg_names: list of volume group names, if empty all will be returned + @param filter_readonly: whether to skip over readonly VGs + + @rtype: list + @return: list of tuples (free_space, total_size, name) with free_space in + MiB + + """ + try: + info = cls._GetVolumeInfo("vgs", ["vg_name", "vg_free", "vg_attr", + "vg_size"]) + except errors.GenericError, err: + logging.error("Can't get VG information: %s", err) + return None + + data = [] + for vg_name, vg_free, vg_attr, vg_size in info: + # (possibly) skip over vgs which are not writable + if filter_readonly and vg_attr[0] == "r": + continue + # (possibly) skip over vgs which are not in the right volume group(s) + if vg_names and vg_name not in vg_names: continue - data.append((float(fields[2]), fields[0], fields[1])) + data.append((float(vg_free), float(vg_size), vg_name)) return data + @classmethod + def _ValidateName(cls, name): + """Validates that a given name is valid as VG or LV name. + + The list of valid characters and restricted names is taken out of + the lvm(8) manpage, with the simplification that we enforce both + VG and LV restrictions on the names. + + """ + if (not cls._VALID_NAME_RE.match(name) or + name in cls._INVALID_NAMES or + compat.any(substring in name for substring in cls._INVALID_SUBSTRINGS)): + _ThrowError("Invalid LVM name '%s'", name) + def Remove(self): """Remove this logical volume. @@ -469,7 +571,7 @@ class LogicalVolume(BlockDev): if result.failed: _ThrowError("Failed to rename the logical volume: %s", result.output) self._lv_name = new_name - self.dev_path = "/dev/%s/%s" % (self._vg_name, self._lv_name) + self.dev_path = utils.PathJoin("/dev", self._vg_name, self._lv_name) def Attach(self): """Attach to an existing LV. @@ -498,7 +600,7 @@ class LogicalVolume(BlockDev): # one line for any non-empty string logging.error("Can't parse LVS output, no lines? Got '%s'", str(out)) return False - out = out[-1].strip().rstrip(',') + out = out[-1].strip().rstrip(",") out = out.split(",") if len(out) != 5: logging.error("Can't parse LVS output, len(%s) != 5", str(out)) @@ -531,7 +633,7 @@ class LogicalVolume(BlockDev): self.minor = minor self.pe_size = pe_size self.stripe_count = stripes - self._degraded = status[0] == 'v' # virtual volume, i.e. doesn't backing + self._degraded = status[0] == "v" # virtual volume, i.e. doesn't backing # storage self.attached = True return True @@ -611,6 +713,8 @@ class LogicalVolume(BlockDev): def Snapshot(self, size): """Create a snapshot copy of an lvm block device. + @returns: tuple (vg, lv) + """ snap_name = self._lv_name + ".snap" @@ -618,12 +722,10 @@ class LogicalVolume(BlockDev): snap = LogicalVolume((self._vg_name, snap_name), None, size) _IgnoreError(snap.Remove) - pvs_info = self.GetPVInfo([self._vg_name]) - if not pvs_info: - _ThrowError("Can't compute PV info for vg %s", self._vg_name) - pvs_info.sort() - pvs_info.reverse() - free_size, _, _ = pvs_info[0] + vg_info = self.GetVGInfo([self._vg_name]) + if not vg_info: + _ThrowError("Can't compute VG info for vg %s", self._vg_name) + free_size, _, _ = vg_info[0] if free_size < size: _ThrowError("Not enough free space: required %s," " available %s", size, free_size) @@ -634,7 +736,7 @@ class LogicalVolume(BlockDev): _ThrowError("command: %s error: %s - %s", result.cmd, result.fail_reason, result.output) - return snap_name + return (self._vg_name, snap_name) def SetInfo(self, text): """Update metadata with info text. @@ -643,8 +745,8 @@ class LogicalVolume(BlockDev): BlockDev.SetInfo(self, text) # Replace invalid characters - text = re.sub('^[^A-Za-z0-9_+.]', '_', text) - text = re.sub('[^-A-Za-z0-9_+.]', '_', text) + text = re.sub("^[^A-Za-z0-9_+.]", "_", text) + text = re.sub("[^-A-Za-z0-9_+.]", "_", text) # Only up to 128 characters are allowed text = text[:128] @@ -655,7 +757,7 @@ class LogicalVolume(BlockDev): _ThrowError("Command: %s error: %s - %s", result.cmd, result.fail_reason, result.output) - def Grow(self, amount): + def Grow(self, amount, dryrun): """Grow the logical volume. """ @@ -666,13 +768,15 @@ class LogicalVolume(BlockDev): rest = amount % full_stripe_size if rest != 0: amount += full_stripe_size - rest + cmd = ["lvextend", "-L", "+%dm" % amount] + if dryrun: + cmd.append("--test") # we try multiple algorithms since the 'best' ones might not have # space available in the right place, but later ones might (since # they have less constraints); also note that only recent LVM # supports 'cling' for alloc_policy in "contiguous", "cling", "normal": - result = utils.RunCmd(["lvextend", "--alloc", alloc_policy, - "-L", "+%dm" % amount, self.dev_path]) + result = utils.RunCmd(cmd + ["--alloc", alloc_policy, self.dev_path]) if not result.failed: return _ThrowError("Can't grow LV %s: %s", self.dev_path, result.output) @@ -790,7 +894,7 @@ class BaseDRBD(BlockDev): # pylint: disable-msg=W0223 0.7 and 8.x versions of DRBD. """ - _VERSION_RE = re.compile(r"^version: (\d+)\.(\d+)\.(\d+)" + _VERSION_RE = re.compile(r"^version: (\d+)\.(\d+)\.(\d+)(?:\.\d+)?" r" \(api:(\d+)/proto:(\d+)(?:-(\d+))?\)") _VALID_LINE_RE = re.compile("^ *([0-9]+): cs:([^ ]+).*$") _UNUSED_LINE_RE = re.compile("^ *([0-9]+): cs:Unconfigured$") @@ -801,6 +905,7 @@ class BaseDRBD(BlockDev): # pylint: disable-msg=W0223 _ST_CONNECTED = "Connected" _STATUS_FILE = "/proc/drbd" + _USERMODE_HELPER_FILE = "/sys/module/drbd/parameters/usermode_helper" @staticmethod def _GetProcData(filename=_STATUS_FILE): @@ -847,7 +952,7 @@ class BaseDRBD(BlockDev): # pylint: disable-msg=W0223 return results @classmethod - def _GetVersion(cls): + def _GetVersion(cls, proc_data): """Return the DRBD version. This will return a dict with keys: @@ -859,7 +964,6 @@ class BaseDRBD(BlockDev): # pylint: disable-msg=W0223 - proto2 (only on drbd > 8.2.X) """ - proc_data = cls._GetProcData() first_line = proc_data[0].strip() version = cls._VERSION_RE.match(first_line) if not version: @@ -867,18 +971,35 @@ class BaseDRBD(BlockDev): # pylint: disable-msg=W0223 first_line) values = version.groups() - retval = {'k_major': int(values[0]), - 'k_minor': int(values[1]), - 'k_point': int(values[2]), - 'api': int(values[3]), - 'proto': int(values[4]), + retval = {"k_major": int(values[0]), + "k_minor": int(values[1]), + "k_point": int(values[2]), + "api": int(values[3]), + "proto": int(values[4]), } if values[5] is not None: - retval['proto2'] = values[5] + retval["proto2"] = values[5] return retval @staticmethod + def GetUsermodeHelper(filename=_USERMODE_HELPER_FILE): + """Returns DRBD usermode_helper currently set. + + """ + try: + helper = utils.ReadFile(filename).splitlines()[0] + except EnvironmentError, err: + if err.errno == errno.ENOENT: + _ThrowError("The file %s cannot be opened, check if the module" + " is loaded (%s)", filename, str(err)) + else: + _ThrowError("Can't read DRBD helper file %s: %s", filename, str(err)) + if not helper: + _ThrowError("Can't read any data from %s", filename) + return helper + + @staticmethod def _DevPath(minor): """Return the path to a drbd device for a given minor. @@ -935,17 +1056,17 @@ class BaseDRBD(BlockDev): # pylint: disable-msg=W0223 sectors = int(result.stdout) except (TypeError, ValueError): _ThrowError("Invalid output from blockdev: '%s'", result.stdout) - bytes = sectors * 512 - if bytes < 128 * 1024 * 1024: # less than 128MiB - _ThrowError("Meta device too small (%.2fMib)", (bytes / 1024 / 1024)) + num_bytes = sectors * 512 + if num_bytes < 128 * 1024 * 1024: # less than 128MiB + _ThrowError("Meta device too small (%.2fMib)", (num_bytes / 1024 / 1024)) # the maximum *valid* size of the meta device when living on top # of LVM is hard to compute: it depends on the number of stripes # and the PE size; e.g. a 2-stripe, 64MB PE will result in a 128MB # (normal size), but an eight-stripe 128MB PE will result in a 1GB # size meta device; as such, we restrict it to 1GB (a little bit # too generous, but making assumptions about PE size is hard) - if bytes > 1024 * 1024 * 1024: - _ThrowError("Meta device too big (%.2fMiB)", (bytes / 1024 / 1024)) + if num_bytes > 1024 * 1024 * 1024: + _ThrowError("Meta device too big (%.2fMiB)", (num_bytes / 1024 / 1024)) def Rename(self, new_id): """Rename a device. @@ -991,11 +1112,11 @@ class DRBD8(BaseDRBD): children = [] super(DRBD8, self).__init__(unique_id, children, size) self.major = self._DRBD_MAJOR - version = self._GetVersion() - if version['k_major'] != 8 : + version = self._GetVersion(self._GetProcData()) + if version["k_major"] != 8 : _ThrowError("Mismatch in DRBD kernel version and requested ganeti" " usage: kernel is %s.%s, ganeti wants 8.x", - version['k_major'], version['k_minor']) + version["k_major"], version["k_minor"]) if (self._lhost is not None and self._lhost == self._rhost and self._lport == self._rport): @@ -1010,6 +1131,17 @@ class DRBD8(BaseDRBD): This will not work if the given minor is in use. """ + # Zero the metadata first, in order to make sure drbdmeta doesn't + # try to auto-detect existing filesystems or similar (see + # http://code.google.com/p/ganeti/issues/detail?id=182); we only + # care about the first 128MB of data in the device, even though it + # can be bigger + result = utils.RunCmd([constants.DD_CMD, + "if=/dev/zero", "of=%s" % dev_path, + "bs=1048576", "count=128", "oflag=direct"]) + if result.failed: + _ThrowError("Can't wipe the meta device: %s", result.output) + result = utils.RunCmd(["drbdmeta", "--force", cls._DevPath(minor), "v08", dev_path, "0", "create-md"]) if result.failed: @@ -1055,7 +1187,10 @@ class DRBD8(BaseDRBD): # pyparsing setup lbrace = pyp.Literal("{").suppress() rbrace = pyp.Literal("}").suppress() + lbracket = pyp.Literal("[").suppress() + rbracket = pyp.Literal("]").suppress() semi = pyp.Literal(";").suppress() + colon = pyp.Literal(":").suppress() # this also converts the value to an int number = pyp.Word(pyp.nums).setParseAction(lambda s, l, t: int(t[0])) @@ -1068,25 +1203,25 @@ class DRBD8(BaseDRBD): # value types value = pyp.Word(pyp.alphanums + '_-/.:') quoted = dbl_quote + pyp.CharsNotIn('"') + dbl_quote - addr_type = (pyp.Optional(pyp.Literal("ipv4")).suppress() + - pyp.Optional(pyp.Literal("ipv6")).suppress()) - addr_port = (addr_type + pyp.Word(pyp.nums + '.') + - pyp.Literal(':').suppress() + number) + ipv4_addr = (pyp.Optional(pyp.Literal("ipv4")).suppress() + + pyp.Word(pyp.nums + ".") + colon + number) + ipv6_addr = (pyp.Optional(pyp.Literal("ipv6")).suppress() + + pyp.Optional(lbracket) + pyp.Word(pyp.hexnums + ":") + + pyp.Optional(rbracket) + colon + number) # meta device, extended syntax - meta_value = ((value ^ quoted) + pyp.Literal('[').suppress() + - number + pyp.Word(']').suppress()) + meta_value = ((value ^ quoted) + lbracket + number + rbracket) # device name, extended syntax device_value = pyp.Literal("minor").suppress() + number # a statement stmt = (~rbrace + keyword + ~lbrace + - pyp.Optional(addr_port ^ value ^ quoted ^ meta_value ^ + pyp.Optional(ipv4_addr ^ ipv6_addr ^ value ^ quoted ^ meta_value ^ device_value) + pyp.Optional(defa) + semi + pyp.Optional(pyp.restOfLine).suppress()) # an entire section - section_name = pyp.Word(pyp.alphas + '_') + section_name = pyp.Word(pyp.alphas + "_") section = section_name + lbrace + pyp.ZeroOrMore(pyp.Group(stmt)) + rbrace bnf = pyp.ZeroOrMore(pyp.Group(section ^ stmt)) @@ -1214,23 +1349,23 @@ class DRBD8(BaseDRBD): if size: args.extend(["-d", "%sm" % size]) if not constants.DRBD_BARRIERS: # disable barriers, if configured so - version = cls._GetVersion() + version = cls._GetVersion(cls._GetProcData()) # various DRBD versions support different disk barrier options; # what we aim here is to revert back to the 'drain' method of # disk flushes and to disable metadata barriers, in effect going # back to pre-8.0.7 behaviour - vmaj = version['k_major'] - vmin = version['k_minor'] - vrel = version['k_point'] + vmaj = version["k_major"] + vmin = version["k_minor"] + vrel = version["k_point"] assert vmaj == 8 if vmin == 0: # 8.0.x if vrel >= 12: - args.extend(['-i', '-m']) + args.extend(["-i", "-m"]) elif vmin == 2: # 8.2.x if vrel >= 7: - args.extend(['-i', '-m']) + args.extend(["-i", "-m"]) elif vmaj >= 3: # 8.3.x or newer - args.extend(['-i', '-a', 'm']) + args.extend(["-i", "-a", "m"]) result = utils.RunCmd(args) if result.failed: _ThrowError("drbd%d: can't attach local disk: %s", minor, result.output) @@ -1256,8 +1391,22 @@ class DRBD8(BaseDRBD): # about its peer. cls._SetMinorSyncSpeed(minor, constants.SYNC_SPEED) + if netutils.IP6Address.IsValid(lhost): + if not netutils.IP6Address.IsValid(rhost): + _ThrowError("drbd%d: can't connect ip %s to ip %s" % + (minor, lhost, rhost)) + family = "ipv6" + elif netutils.IP4Address.IsValid(lhost): + if not netutils.IP4Address.IsValid(rhost): + _ThrowError("drbd%d: can't connect ip %s to ip %s" % + (minor, lhost, rhost)) + family = "ipv4" + else: + _ThrowError("drbd%d: Invalid ip %s" % (minor, lhost)) + args = ["drbdsetup", cls._DevPath(minor), "net", - "%s:%s" % (lhost, lport), "%s:%s" % (rhost, rport), protocol, + "%s:%s:%s" % (family, lhost, lport), + "%s:%s:%s" % (family, rhost, rport), protocol, "-A", "discard-zero-changes", "-B", "consensus", "--create-device", @@ -1371,6 +1520,30 @@ class DRBD8(BaseDRBD): children_result = super(DRBD8, self).SetSyncSpeed(kbytes) return self._SetMinorSyncSpeed(self.minor, kbytes) and children_result + def PauseResumeSync(self, pause): + """Pauses or resumes the sync of a DRBD device. + + @param pause: Wether to pause or resume + @return: the success of the operation + + """ + if self.minor is None: + logging.info("Not attached during PauseSync") + return False + + children_result = super(DRBD8, self).PauseResumeSync(pause) + + if pause: + cmd = "pause-sync" + else: + cmd = "resume-sync" + + result = utils.RunCmd(["drbdsetup", self.dev_path, cmd]) + if result.failed: + logging.error("Can't %s: %s - %s", cmd, + result.fail_reason, result.output) + return not result.failed and children_result + def GetProcStatus(self): """Return device data from /proc. @@ -1755,7 +1928,7 @@ class DRBD8(BaseDRBD): cls._InitMeta(aminor, meta.dev_path) return cls(unique_id, children, size) - def Grow(self, amount): + def Grow(self, amount, dryrun): """Resize the DRBD device and its backing storage. """ @@ -1763,7 +1936,10 @@ class DRBD8(BaseDRBD): _ThrowError("drbd%d: Grow called while not attached", self._aminor) if len(self._children) != 2 or None in self._children: _ThrowError("drbd%d: cannot grow diskless device", self.minor) - self._children[0].Grow(amount) + self._children[0].Grow(amount, dryrun) + if dryrun: + # DRBD does not support dry-run mode, so we'll return here + return result = utils.RunCmd(["drbdsetup", self.dev_path, "resize", "-s", "%dm" % (self.size + amount)]) if result.failed: @@ -1845,14 +2021,26 @@ class FileStorage(BlockDev): # TODO: implement rename for file-based storage _ThrowError("Rename is not supported for file-based storage") - def Grow(self, amount): + def Grow(self, amount, dryrun): """Grow the file @param amount: the amount (in mebibytes) to grow with """ - # TODO: implement grow for file-based storage - _ThrowError("Grow not supported for file-based storage") + # Check that the file exists + self.Assemble() + current_size = self.GetActualSize() + new_size = current_size + amount * 1024 * 1024 + assert new_size > current_size, "Cannot Grow with a negative amount" + # We can't really simulate the growth + if dryrun: + return + try: + f = open(self.dev_path, "a+") + f.truncate(new_size) + f.close() + except EnvironmentError, err: + _ThrowError("Error in file growth: %", str(err)) def Attach(self): """Attach to an existing file. @@ -1892,24 +2080,136 @@ class FileStorage(BlockDev): if not isinstance(unique_id, (tuple, list)) or len(unique_id) != 2: raise ValueError("Invalid configuration data %s" % str(unique_id)) dev_path = unique_id[1] - if os.path.exists(dev_path): - _ThrowError("File already existing: %s", dev_path) try: - f = open(dev_path, 'w') + fd = os.open(dev_path, os.O_RDWR | os.O_CREAT | os.O_EXCL) + f = os.fdopen(fd, "w") f.truncate(size * 1024 * 1024) f.close() - except IOError, err: + except EnvironmentError, err: + if err.errno == errno.EEXIST: + _ThrowError("File already existing: %s", dev_path) _ThrowError("Error in file creation: %", str(err)) return FileStorage(unique_id, children, size) +class PersistentBlockDevice(BlockDev): + """A block device with persistent node + + May be either directly attached, or exposed through DM (e.g. dm-multipath). + udev helpers are probably required to give persistent, human-friendly + names. + + For the time being, pathnames are required to lie under /dev. + + """ + def __init__(self, unique_id, children, size): + """Attaches to a static block device. + + The unique_id is a path under /dev. + + """ + super(PersistentBlockDevice, self).__init__(unique_id, children, size) + if not isinstance(unique_id, (tuple, list)) or len(unique_id) != 2: + raise ValueError("Invalid configuration data %s" % str(unique_id)) + self.dev_path = unique_id[1] + if not os.path.realpath(self.dev_path).startswith("/dev/"): + raise ValueError("Full path '%s' lies outside /dev" % + os.path.realpath(self.dev_path)) + # TODO: this is just a safety guard checking that we only deal with devices + # we know how to handle. In the future this will be integrated with + # external storage backends and possible values will probably be collected + # from the cluster configuration. + if unique_id[0] != constants.BLOCKDEV_DRIVER_MANUAL: + raise ValueError("Got persistent block device of invalid type: %s" % + unique_id[0]) + + self.major = self.minor = None + self.Attach() + + @classmethod + def Create(cls, unique_id, children, size): + """Create a new device + + This is a noop, we only return a PersistentBlockDevice instance + + """ + return PersistentBlockDevice(unique_id, children, 0) + + def Remove(self): + """Remove a device + + This is a noop + + """ + pass + + def Rename(self, new_id): + """Rename this device. + + """ + _ThrowError("Rename is not supported for PersistentBlockDev storage") + + def Attach(self): + """Attach to an existing block device. + + + """ + self.attached = False + try: + st = os.stat(self.dev_path) + except OSError, err: + logging.error("Error stat()'ing %s: %s", self.dev_path, str(err)) + return False + + if not stat.S_ISBLK(st.st_mode): + logging.error("%s is not a block device", self.dev_path) + return False + + self.major = os.major(st.st_rdev) + self.minor = os.minor(st.st_rdev) + self.attached = True + + return True + + def Assemble(self): + """Assemble the device. + + """ + pass + + def Shutdown(self): + """Shutdown the device. + + """ + pass + + def Open(self, force=False): + """Make the device ready for I/O. + + """ + pass + + def Close(self): + """Notifies that the device will no longer be used for I/O. + + """ + pass + + def Grow(self, amount, dryrun): + """Grow the logical volume. + + """ + _ThrowError("Grow is not supported for PersistentBlockDev storage") + + DEV_MAP = { constants.LD_LV: LogicalVolume, constants.LD_DRBD8: DRBD8, + constants.LD_BLOCKDEV: PersistentBlockDevice, } -if constants.ENABLE_FILE_STORAGE: +if constants.ENABLE_FILE_STORAGE or constants.ENABLE_SHARED_FILE_STORAGE: DEV_MAP[constants.LD_FILE] = FileStorage