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# |
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# lvm.py |
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# lvm functions |
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# |
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# Copyright (C) 2009 Red Hat, Inc. All rights reserved. |
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# |
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# This program is free software; you can redistribute it and/or modify |
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# it under the terms of the GNU General Public License as published by |
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# the Free Software Foundation; either version 2 of the License, or |
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# (at your option) any later version. |
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# |
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# This program is distributed in the hope that it will be useful, |
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# but WITHOUT ANY WARRANTY; without even the implied warranty of |
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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# GNU General Public License for more details. |
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# |
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# You should have received a copy of the GNU General Public License |
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# along with this program. If not, see <http://www.gnu.org/licenses/>. |
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# |
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# Author(s): Dave Lehman <dlehman@redhat.com> |
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# |
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|
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import os |
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import math |
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import re |
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|
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import iutil |
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import logging |
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log = logging.getLogger("storage") |
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|
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from ..errors import * |
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from constants import * |
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|
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import gettext |
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_ = lambda x: gettext.ldgettext("anaconda", x) |
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|
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MAX_LV_SLOTS = 256 |
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|
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def has_lvm(): |
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has_lvm = False |
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for path in os.environ["PATH"].split(":"): |
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if os.access("%s/lvm" % path, os.X_OK): |
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has_lvm = True |
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break |
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|
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if has_lvm: |
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has_lvm = False |
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for line in open("/proc/devices").readlines(): |
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if "device-mapper" in line.split(): |
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has_lvm = True |
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break |
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|
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return has_lvm |
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|
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# Start config_args handling code |
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# |
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# Theoretically we can handle all that can be handled with the LVM --config |
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# argument. For every time we call an lvm_cc (lvm compose config) funciton |
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# we regenerate the config_args with all global info. |
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config_args = [] # Holds the final argument list |
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config_args_data = { "filterRejects": [], # regular expressions to reject. |
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"filterAccepts": [] } # regexp to accept |
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|
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def _composeConfig(): |
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"""lvm command accepts lvm.conf type arguments preceded by --config. """ |
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global config_args, config_args_data |
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config_args = [] |
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|
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filter_string = "" |
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# we don't need the accept for now. |
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# accepts = config_args_data["filterAccepts"] |
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# if len(accepts) > 0: |
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# for i in range(len(rejects)): |
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# filter_string = filter_string + ("\"a|/%s$|\", " % accepts[i]) |
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|
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rejects = config_args_data["filterRejects"] |
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for reject in rejects: |
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filter_string += ("\"r|/%s$|\"," % reject) |
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|
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filter_string = " filter=[%s] " % filter_string.strip(",") |
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|
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# As we add config strings we should check them all. |
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if filter_string == "": |
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# Nothing was really done. |
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return |
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|
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# devices_string can have (inside the brackets) "dir", "scan", |
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# "preferred_names", "filter", "cache_dir", "write_cache_state", |
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# "types", "sysfs_scan", "md_component_detection". see man lvm.conf. |
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devices_string = " devices {%s} " % (filter_string) # strings can be added |
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config_string = devices_string # more strings can be added. |
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config_args = ["--config", config_string] |
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|
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def lvm_cc_addFilterRejectRegexp(regexp): |
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""" Add a regular expression to the --config string.""" |
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global config_args_data |
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log.debug("lvm filter: adding %s to the reject list" % regexp) |
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config_args_data["filterRejects"].append(regexp) |
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|
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# compoes config once more. |
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_composeConfig() |
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|
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def lvm_cc_resetFilter(): |
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global config_args, config_args_data |
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config_args_data["filterRejects"] = [] |
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config_args_data["filterAccepts"] = [] |
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config_args = [] |
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# End config_args handling code. |
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|
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# Names that should not be used int the creation of VGs |
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lvm_vg_blacklist = [] |
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def blacklistVG(name): |
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global lvm_vg_blacklist |
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lvm_vg_blacklist.append(name) |
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|
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def getPossiblePhysicalExtents(floor=0): |
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"""Returns a list of integers representing the possible values for |
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the physical extent of a volume group. Value is in KB. |
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|
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floor - size (in KB) of smallest PE we care about. |
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""" |
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|
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possiblePE = [] |
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curpe = 8 |
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while curpe <= 16384*1024: |
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if curpe >= floor: |
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possiblePE.append(curpe) |
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curpe = curpe * 2 |
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|
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return possiblePE |
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|
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def getMaxLVSize(): |
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""" Return the maximum size (in MB) of a logical volume. """ |
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if iutil.getArch() in ("x86_64", "ppc64", "alpha", "ia64", "s390", "sparc"): #64bit architectures |
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return (8*1024*1024*1024*1024) #Max is 8EiB (very large number..) |
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else: |
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return (16*1024*1024) #Max is 16TiB |
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|
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# apparently lvm has a limit of 126 chars for combined vg-lv names: |
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# https://bugzilla.redhat.com/show_bug.cgi?id=747278#c6 |
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# https://bugzilla.redhat.com/show_bug.cgi?id=747278#c7 |
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# since dashes get escaped they count double -- allow for six of them since |
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# a dhcp-provided hostname could easily contain five dashes ("dhcp-xx-xx-xx-xx") |
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LVM_MAX_NAME_LEN = 50 |
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|
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def safeLvmName(name, maxlen=LVM_MAX_NAME_LEN): |
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tmp = name.strip() |
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tmp = tmp.replace("/", "_") |
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tmp = re.sub("[^0-9a-zA-Z._]", "", tmp) |
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tmp = tmp.lstrip("_") |
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|
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if len(tmp) > maxlen: |
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tmp = tmp[:maxlen] |
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|
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return tmp |
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|
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def clampSize(size, pesize, roundup=None): |
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if roundup: |
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round = math.ceil |
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else: |
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round = math.floor |
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|
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return long(round(float(size)/float(pesize)) * pesize) |
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|
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def lvm(args, progress=None): |
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rc = iutil.execWithPulseProgress("lvm", args, |
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stdout = "/dev/tty5", |
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stderr = "/dev/tty5", |
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progress=progress) |
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if not rc: |
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return |
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|
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try: |
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msg = open("/tmp/program.log").readlines()[-1].strip() |
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except Exception: |
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msg = "" |
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|
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raise LVMError(msg) |
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|
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def pvcreate(device, progress=None): |
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# we force dataalignment=1024k since we cannot get lvm to tell us what |
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# the pe_start will be in advance |
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args = ["pvcreate"] + \ |
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config_args + \ |
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["--dataalignment", "1024k"] + \ |
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[device] |
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|
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try: |
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lvm(args, progress=progress) |
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except LVMError as msg: |
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raise LVMError("pvcreate failed for %s: %s" % (device, msg)) |
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|
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def pvresize(device, size): |
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args = ["pvresize"] + \ |
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["--setphysicalvolumesize", ("%dm" % size)] + \ |
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config_args + \ |
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[device] |
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|
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try: |
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lvm(args) |
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except LVMError as msg: |
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raise LVMError("pvresize failed for %s: %s" % (device, msg)) |
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|
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def pvremove(device): |
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args = ["pvremove"] + \ |
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config_args + \ |
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[device] |
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|
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try: |
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lvm(args) |
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except LVMError as msg: |
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raise LVMError("pvremove failed for %s: %s" % (device, msg)) |
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|
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def pvinfo(device): |
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""" |
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If the PV was created with '--metadacopies 0', lvm will do some |
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scanning of devices to determine from their metadata which VG |
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this PV belongs to. |
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|
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pvs -o pv_name,pv_mda_count,vg_name,vg_uuid --config \ |
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'devices { scan = "/dev" filter = ["a/loop0/", "r/.*/"] }' |
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""" |
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#cfg = "'devices { scan = \"/dev\" filter = [\"a/%s/\", \"r/.*/\"] }'" |
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args = ["pvs", "--noheadings"] + \ |
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["--units", "m"] + \ |
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["-o", "pv_name,pv_mda_count,vg_name,vg_uuid"] + \ |
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config_args + \ |
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[device] |
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|
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rc = iutil.execWithCapture("lvm", args, |
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stderr = "/dev/tty5") |
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vals = rc.split() |
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if not vals: |
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raise LVMError("pvinfo failed for %s" % device) |
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|
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# don't raise an exception if pv is not a part of any vg |
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pv_name = vals[0] |
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try: |
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vg_name, vg_uuid = vals[2], vals[3] |
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except IndexError: |
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vg_name, vg_uuid = "", "" |
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|
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info = {'pv_name': pv_name, |
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'vg_name': vg_name, |
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'vg_uuid': vg_uuid} |
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|
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return info |
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|
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def vgcreate(vg_name, pv_list, pe_size, progress=None): |
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argv = ["vgcreate"] |
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if pe_size: |
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argv.extend(["-s", "%dm" % pe_size]) |
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argv.extend(config_args) |
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argv.append(vg_name) |
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argv.extend(pv_list) |
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|
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try: |
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lvm(argv, progress=progress) |
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except LVMError as msg: |
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raise LVMError("vgcreate failed for %s: %s" % (vg_name, msg)) |
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|
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def vgremove(vg_name): |
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args = ["vgremove", "--force"] + \ |
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config_args +\ |
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[vg_name] |
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|
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try: |
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lvm(args) |
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except LVMError as msg: |
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raise LVMError("vgremove failed for %s: %s" % (vg_name, msg)) |
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|
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def vgactivate(vg_name): |
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args = ["vgchange", "-a", "y"] + \ |
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config_args + \ |
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[vg_name] |
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|
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try: |
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lvm(args) |
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except LVMError as msg: |
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raise LVMError("vgactivate failed for %s: %s" % (vg_name, msg)) |
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|
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def vgdeactivate(vg_name): |
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args = ["vgchange", "-a", "n"] + \ |
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config_args + \ |
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[vg_name] |
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|
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try: |
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lvm(args) |
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except LVMError as msg: |
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raise LVMError("vgdeactivate failed for %s: %s" % (vg_name, msg)) |
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|
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def vgreduce(vg_name, pv_list, rm=False): |
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""" Reduce a VG. |
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|
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rm -> with RemoveMissing option. |
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Use pv_list when rm=False, otherwise ignore pv_list and call vgreduce with |
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the --removemissing option. |
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""" |
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args = ["vgreduce"] |
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args.extend(config_args) |
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if rm: |
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args.extend(["--removemissing", vg_name]) |
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else: |
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args.extend([vg_name] + pv_list) |
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|
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try: |
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lvm(args) |
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except LVMError as msg: |
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raise LVMError("vgreduce failed for %s: %s" % (vg_name, msg)) |
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|
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def vginfo(vg_name): |
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args = ["vgs", "--noheadings", "--nosuffix"] + \ |
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["--units", "m"] + \ |
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["-o", "uuid,size,free,extent_size,extent_count,free_count,pv_count"] + \ |
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config_args + \ |
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[vg_name] |
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|
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buf = iutil.execWithCapture("lvm", |
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args, |
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stderr="/dev/tty5") |
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info = buf.split() |
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if len(info) != 7: |
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raise LVMError(_("vginfo failed for %s" % vg_name)) |
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|
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d = {} |
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(d['uuid'],d['size'],d['free'],d['pe_size'], |
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d['pe_count'],d['pe_free'],d['pv_count']) = info |
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return d |
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|
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def lvs(vg_name): |
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args = ["lvs", "--noheadings", "--nosuffix"] + \ |
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["--units", "m"] + \ |
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["-o", "lv_name,lv_uuid,lv_size,lv_attr"] + \ |
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config_args + \ |
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[vg_name] |
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|
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buf = iutil.execWithCapture("lvm", |
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args, |
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stderr="/dev/tty5") |
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|
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lvs = {} |
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for line in buf.splitlines(): |
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line = line.strip() |
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if not line: |
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continue |
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(name, uuid, size, attr) = line.split() |
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lvs[name] = {"size": size, |
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"uuid": uuid, |
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"attr": attr} |
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|
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if not lvs: |
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raise LVMError(_("lvs failed for %s" % vg_name)) |
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|
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return lvs |
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|
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def lvorigin(vg_name, lv_name): |
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args = ["lvs", "--noheadings", "-o", "origin"] + \ |
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config_args + \ |
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["%s/%s" % (vg_name, lv_name)] |
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|
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buf = iutil.execWithCapture("lvm", |
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args, |
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stderr="/dev/tty5") |
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|
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try: |
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origin = buf.splitlines()[0].strip() |
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except IndexError: |
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origin = '' |
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|
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return origin |
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|
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def lvcreate(vg_name, lv_name, size, progress=None, pvs=[]): |
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args = ["lvcreate"] + \ |
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["-L", "%dm" % size] + \ |
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["-n", lv_name] + \ |
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config_args + \ |
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[vg_name] + pvs |
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|
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try: |
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lvm(args, progress=progress) |
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except LVMError as msg: |
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raise LVMError("lvcreate failed for %s/%s: %s" % (vg_name, lv_name, msg)) |
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|
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def lvremove(vg_name, lv_name): |
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args = ["lvremove"] + \ |
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config_args + \ |
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["%s/%s" % (vg_name, lv_name)] |
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|
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try: |
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lvm(args) |
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except LVMError as msg: |
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raise LVMError("lvremove failed for %s: %s" % (lv_name, msg)) |
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|
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def lvresize(vg_name, lv_name, size): |
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args = ["lvresize"] + \ |
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["--force", "-L", "%dm" % size] + \ |
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config_args + \ |
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["%s/%s" % (vg_name, lv_name)] |
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|
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try: |
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lvm(args) |
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except LVMError as msg: |
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raise LVMError("lvresize failed for %s: %s" % (lv_name, msg)) |
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|
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def lvactivate(vg_name, lv_name): |
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# see if lvchange accepts paths of the form 'mapper/$vg-$lv' |
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args = ["lvchange", "-a", "y"] + \ |
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config_args + \ |
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["%s/%s" % (vg_name, lv_name)] |
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|
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try: |
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lvm(args) |
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except LVMError as msg: |
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raise LVMError("lvactivate failed for %s: %s" % (lv_name, msg)) |
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|
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def lvdeactivate(vg_name, lv_name): |
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args = ["lvchange", "-a", "n"] + \ |
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config_args + \ |
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["%s/%s" % (vg_name, lv_name)] |
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|
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try: |
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lvm(args) |
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except LVMError as msg: |
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raise LVMError("lvdeactivate failed for %s: %s" % (lv_name, msg)) |
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