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#!/usr/bin/python
#
# dmraid.py - dmraid probing control
#
# Peter Jones <pjones@redhat.com>
#
# Copyright 2005 Red Hat, Inc.
#
# This software may be freely redistributed under the terms of the GNU
# library public license.
#
# You should have received a copy of the GNU Library Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
#
"""DMRaid probing control."""
# XXX dmraid and md raid should be abstracted from the same thing. -pj
# XXX dmraid and lvm should use a common control mechanism (such as block.dm)
# for device-mapper. -pj
import sys
import block
import parted
import raid
from flags import flags
import logging
log = logging.getLogger("anaconda.dmraid")
import isys
# these arches can have their /boot on DMRAID and not have their
# boot loader blow up
# XXX This needs to be functional so it can test if drives sit on particular
# controlers. -pj
dmraidBootArches = [ "i386", "x86_64" ]
cachedDrives = {}
class DegradedRaidWarning(Warning):
def __init__(self, *args):
self.args = args
def __str__(self):
return self.args and ('%s' % self.args[0]) or repr(self)
def getRaidSetInfo(rs):
"""Builds information about a dmraid set
rs is a block.dmraid.raidset instance
Returns a list of tuples for this raidset and its
dependencies, in sorted order, of the form
(raidSet, parentRaidSet, devices, level, nrDisks, totalDisks)
"""
if not isinstance(rs, block.RaidSet):
raise TypeError, "getRaidSetInfo needs raidset, got %s" % (rs.__class__,)
for m in rs.members:
if isinstance(m, block.RaidSet):
infos = getRaidSetInfo(m)
for info in infos:
if info[1] is None:
info[1] = rs
yield info
try:
parent = None
devs = list(rs.members)
sparedevs = list(rs.spares)
totalDisks = len(devs) + len(sparedevs)
nrDisks = len(devs)
devices = devs + sparedevs
level = rs.level
yield (rs, parent, devices, level, nrDisks, totalDisks)
except:
# something went haywire
log.error("Exception occurred reading info for %s: %s" % \
(repr(rs), (sys.exc_type, ))) # XXX PJFIX sys.exc_info)))
raise
def scanForRaid(drives, degradedOk=False):
"""Scans for dmraid devices on drives.
drives is a list of device names.
Returns a list of (raidSet, parentRaidSet, devices, level, totalDisks)
tuples.
"""
log.debug("scanning for dmraid on drives %s" % (drives,))
Sets = {}
Devices = {}
probeDrives = []
for d in drives:
dp = "/tmp/" + d
isys.makeDevInode(d, dp)
probeDrives.append(dp)
dmsets = block.getRaidSets(probeDrives)
for dmset in dmsets:
infos = getRaidSetInfo(dmset)
for info in infos:
rs = info[0]
log.debug("got raidset %s" % (rs,))
# XXX not the way to do this; also, need to inform the user
if rs.rs.total_devs > rs.rs.found_devs \
and not degradedOk:
#raise DegradedRaidWarning, rs
continue
#(rs, parent, devices, level, nrDisks, totalDisks) = info
# XXX ewwwww, what a hack.
isys.cachedDrives["mapper/" + rs.name] = rs
drives = []
for m in rs.members:
if isinstance(m, block.RaidDev):
disk = m.rd.device.path.split('/')[-1]
if isys.cachedDrives.has_key(disk):
drives.append({disk:isys.cachedDrives[disk]})
del isys.cachedDrives[disk]
cachedDrives[rs] = drives
yield info
def startRaidDev(rs):
if flags.dmraid == 0:
return
rs.prefix = '/tmp/mapper/'
log.debug("starting raid %s with mknod=True" % (rs,))
rs.activate(mknod=True)
def startAllRaid(driveList):
"""Do a raid start on raid devices and return a list like scanForRaid."""
if flags.dmraid == 0:
return
log.debug("starting all dmraids on drives %s" % (driveList,))
dmList = scanForRaid(driveList)
for dmset in dmList:
rs = dmset[0]
startRaidDev(rs)
yield dmset
def stopRaidSet(rs):
if flags.dmraid == 0:
return
log.debug("stopping raid %s" % (rs,))
if isys.cachedDrives.has_key("mapper/" + rs.name):
del isys.cachedDrives["mapper/" + rs.name]
if cachedDrives.has_key(rs):
for item in cachedDrives[rs]:
isys.cachedDrives[item.keys()[0]] = item.values()[0]
rs.deactivate()
#block.removeDeviceMap(map)
def stopAllRaid(dmList):
"""Do a raid stop on each of the raid device tuples given."""
if flags.dmraid == 0:
return
import traceback as _traceback
stack = _traceback.format_stack()
for frame in stack:
log.debug(frame)
log.debug("stopping all dmraids")
for rs in dmList:
stopRaidSet(rs[0])
def isRaid6(raidlevel):
"""Return whether raidlevel is a valid descriptor of RAID6."""
return False
def isRaid5(raidlevel):
"""Return whether raidlevel is a valid descriptor of RAID5."""
return False
def isRaid1(raidlevel):
"""Return whether raidlevel is a valid descriptor of RAID1."""
return raid.isRaid1(raidlevel)
def isRaid0(raidlevel):
"""Return whether raidlevel is a valid descriptor of RAID1."""
return raid.isRaid0(raidlevel)
def get_raid_min_members(raidlevel):
"""Return the minimum number of raid members required for raid level"""
return raid.get_raid_min_members(raidlevel)
def get_raid_max_spares(raidlevel, nummembers):
"""Return the maximum number of raid spares for raidlevel."""
return raid.get_raid_max_spares(raidlevel, nummembers)
def register_raid_device(dmname, newdevices, newlevel, newnumActive):
"""Register a new RAID device in the dmlist."""
raise NotImplementedError
def lookup_raid_device(dmname):
"""Return the requested RAID device information."""
for rs, parent, devices, level, nrDisks, totalDisks in \
partedUtils.DiskSet.dmList:
if dmname == rs.name:
return (rs.name, devices, level, totalDisks)
raise KeyError, "dm device not found"
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