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# lvm.py - lvm probing control
#
# Jeremy Katz <katzj@redhat.com>
#
# Copyright 2002 Red Hat, Inc.
#
# This software may be freely redistributed under the terms of the GNU
# general public license.
#
# 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., 675 Mass Ave, Cambridge, MA 02139, USA.
import iutil
import os,sys
import string
import math
from flags import flags
MAX_LV_SLOTS=256
output = "/tmp/lvmout"
def vgscan():
"""Runs vgscan."""
if flags.test:
return
rc = iutil.execWithRedirect("/usr/sbin/vgscan",
["/usr/sbin/vgscan", "-v"],
stdout = output,
stderr = output,
searchPath = 1)
if rc:
raise SystemError, "vgscan failed"
def vgactivate(volgroup = None):
"""Activate volume groups by running vgchange -ay.
volgroup - optional single volume group to activate
"""
if flags.test:
return
args = ["/usr/sbin/vgchange", "-ay", "-An"]
if volgroup:
args.append(volgroup)
rc = iutil.execWithRedirect(args[0], args,
stdout = output,
stderr = output,
searchPath = 1)
if rc:
raise SystemError, "vgchange failed"
def vgdeactivate(volgroup = None):
"""Deactivate volume groups by running vgchange -an.
volgroup - optional single volume group to deactivate
"""
if flags.test:
return
args = ["/usr/sbin/vgchange", "-an", "-An"]
if volgroup:
args.append(volgroup)
rc = iutil.execWithRedirect(args[0], args,
stdout = output,
stderr = output,
searchPath = 1)
if rc:
raise SystemError, "vgchange failed"
def lvremove(lvname, vgname):
"""Removes a logical volume.
lvname - name of logical volume to remove.
vgname - name of volume group lv is in.
"""
if flags.test:
return
args = ["/usr/sbin/lvremove", "-f", "-An"]
dev = "/dev/%s/%s" %(vgname, lvname)
args.append(dev)
rc = iutil.execWithRedirect(args[0], args,
stdout = output,
stderr = output,
searchPath = 1)
if rc:
raise SystemError, "lvremove failed"
def vgremove(vgname):
"""Removes a volume group. Deactivates the volume group first
vgname - name of volume group.
"""
if flags.test:
return
# we'll try to deactivate... if it fails, we'll probably fail on
# the removal too... but it's worth a shot
try:
vgdeactivate(vgname)
except:
pass
args = ["/usr/sbin/vgremove", vgname]
rc = iutil.execWithRedirect(args[0], args,
stdout = output,
stderr = output,
searchPath = 1)
if rc:
raise SystemError, "vgremove failed"
def getPossiblePhysicalExtents(floor=0):
"""Returns a list of integers representing the possible values for
the physical extent of a volume group. Value is in KB.
floor - size (in KB) of smallest PE we care about.
"""
possiblePE = []
curpe = 8
while curpe <= 16384*1024:
if curpe >= floor:
possiblePE.append(curpe)
curpe = curpe * 2
return possiblePE
def clampLVSizeRequest(size, pe):
"""Given a size and a PE, returns the actual size of logical volumne.
size - size (in MB) of logical volume request
pe - PE size (in KB)
"""
if ((size*1024L) % pe) == 0:
return size
else:
return ((long((size*1024L)/pe)+1L)*pe)/1024
def clampPVSize(pvsize, pesize):
"""Given a PV size and a PE, returns the usable space of the PV.
Takes into account both overhead of the physical volume and 'clamping'
to the PE size.
pvsize - size (in MB) of PV request
pesize - PE size (in KB)
"""
# calculate the number of physical extents. this is size / pesize
# with an appropriate factor for kb/mb matchup
numpes = math.floor(pvsize * 1024 / pesize)
# now, calculate our "real" overhead. 4 bytes for each PE + 128K
overhead = (4 * numpes / 1024) + 128
# now, heuristically, the max of ceil(pesize + 2*overhead) and
# ceil(2*overhead) is greater than the real overhead, so we won't
# get people in a situation where they overcommit the vg
one = math.ceil(pesize + 2 * overhead)
two = math.ceil(2 * overhead)
# now we have to do more unit conversion since our overhead in in KB
if one > two:
usable = pvsize - math.ceil(one / 1024.0)
else:
usable = pvsize - math.ceil(two / 1024.0)
# finally, clamp to being at a pesize boundary
return (long(usable*1024/pesize)*pesize)/1024
def getMaxLVSize(pe):
"""Given a PE size in KB, returns maximum size (in MB) of a logical volume.
pe - PE size in KB
"""
return pe*64
def createSuggestedVGName(partitions):
"""Given list of partition requests, come up with a reasonable VG name
partitions - list of requests
"""
i = 0
while 1:
tmpname = "Volume%02d" % (i,)
if not partitions.isVolumeGroupNameInUse(tmpname):
break
i = i + 1
if i>99:
tmpname = ""
return tmpname
def createSuggestedLVName(logreqs):
"""Given list of LV requests, come up with a reasonable LV name
partitions - list of LV requests for this VG
"""
i = 0
lnames = []
for lv in logreqs:
lnames.append(lv.logicalVolumeName)
while 1:
tmpname = "LogVol%02d" % (i,)
if (logreqs is None) or (tmpname not in lnames):
break
i = i + 1
if i>99:
tmpname = ""
return tmpname
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