229 lines
7.6 KiB
Python
229 lines
7.6 KiB
Python
from ..udev import *
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import iutil
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def parseMultipathOutput(output):
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# this function parses output from "multipath -d", so we can use its
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# logic for our topology.
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# The input looks like:
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# create: mpathb (1ATA ST3120026AS 5M) undef ATA,ST3120026AS
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# size=112G features='0' hwhandler='0' wp=undef
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# `-+- policy='round-robin 0' prio=1 status=undef
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# `- 2:0:0:0 sda 8:0 undef ready running
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# create: mpatha (36006016092d21800703762872c60db11) undef DGC,RAID 5
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# size=10G features='1 queue_if_no_path' hwhandler='1 emc' wp=undef
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# `-+- policy='round-robin 0' prio=2 status=undef
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# |- 6:0:0:0 sdb 8:16 undef ready running
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# `- 7:0:0:0 sdc 8:32 undef ready running
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#
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# (In anaconda, the first one there won't be included because we blacklist
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# "ATA" as a vendor.)
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#
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# It returns a structure like:
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# [ {'mpatha':['sdb','sdc']}, ... ]
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mpaths = {}
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if output is None:
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return mpaths
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name = None
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devices = []
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lines = output.split('\n')
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for line in lines:
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lexemes = line.split()
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if not lexemes:
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break
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if lexemes[0] == 'create:':
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if name and devices:
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mpaths[name] = devices
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name = None
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devices = []
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name = lexemes[1]
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elif lexemes[0].startswith('size='):
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pass
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elif lexemes[0] == '`-+-':
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pass
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elif lexemes[0] in ['|-','`-']:
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devices.append(lexemes[2].replace('!', '/'))
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if name and devices:
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mpaths[name] = devices
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return mpaths
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def identifyMultipaths(devices):
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# this function does a couple of things
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# 1) identifies multipath disks
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# 2) sets their ID_FS_TYPE to multipath_member
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# 3) removes the individual members of an mpath's partitions
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# sample input with multipath pair [sdb,sdc]
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# [sr0, sda, sda1, sdb, sdb1, sdb2, sdc, sdc1, sdd, sdd1, sdd2]
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# sample output:
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# [sda, sdd], [[sdb, sdc]], [sr0, sda1, sdd1, sdd2]]
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log.info("devices to scan for multipath: %s" % [d['name'] for d in devices])
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topology = parseMultipathOutput(iutil.execWithCapture("multipath", ["-d",]))
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# find the devices that aren't in topology, and add them into it...
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topodevs = reduce(lambda x,y: x.union(y), topology.values(), set())
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for name in set([d['name'] for d in devices]).difference(topodevs):
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topology[name] = [name]
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devmap = {}
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non_disk_devices = {}
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for d in devices:
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if not udev_device_is_disk(d):
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non_disk_devices[d['name']] = d
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log.info("adding %s to non_disk_device list" % (d['name'],))
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continue
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devmap[d['name']] = d
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singlepath_disks = []
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multipaths = []
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for name, disks in topology.items():
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if len(disks) == 1:
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if not non_disk_devices.has_key(disks[0]):
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log.info("adding %s to singlepath_disks" % (disks[0],))
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singlepath_disks.append(devmap[disks[0]])
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else:
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# some usb cardreaders use multiple lun's (for different slots)
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# and report a fake disk serial which is the same for all the
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# lun's (#517603)
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all_usb = True
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# see if we've got any non-disk devices on our mpath list.
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# If so, they're probably false-positives.
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non_disks = False
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for disk in disks:
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d = devmap[disk]
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if d.get("ID_USB_DRIVER") != "usb-storage":
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all_usb = False
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if (not devmap.has_key(disk)) and non_disk_devices.has_key(disk):
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log.warning("non-disk device %s is part of an mpath" %
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(disk,))
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non_disks = True
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if all_usb:
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log.info("adding multi lun usb mass storage device to singlepath_disks: %s" %
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(disks,))
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singlepath_disks.extend([devmap[d] for d in disks])
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continue
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if non_disks:
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for disk in disks:
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if devmap.has_key(disk):
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del devmap[disk]
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if topology.has_key(disk):
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del topology[disk]
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continue
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log.info("found multipath set: %s" % (disks,))
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for disk in disks:
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d = devmap[disk]
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log.info("adding %s to multipath_disks" % (disk,))
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d["ID_FS_TYPE"] = "multipath_member"
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d["ID_MPATH_NAME"] = name
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multipaths.append([devmap[d] for d in disks])
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non_disk_serials = {}
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for name,device in non_disk_devices.items():
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serial = udev_device_get_serial(device)
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non_disk_serials.setdefault(serial, [])
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non_disk_serials[serial].append(device)
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for mpath in multipaths:
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for serial in [d.get('ID_SERIAL_SHORT') for d in mpath]:
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if non_disk_serials.has_key(serial):
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log.info("filtering out non disk devices [%s]" % [d['name'] for d in non_disk_serials[serial]])
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for name in [d['name'] for d in non_disk_serials[serial]]:
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if non_disk_devices.has_key(name):
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del non_disk_devices[name]
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partition_devices = []
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for device in non_disk_devices.values():
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partition_devices.append(device)
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# this is the list of devices we want to keep from the original
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# device list, but we want to maintain its original order.
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singlepath_disks = filter(lambda d: d in devices, singlepath_disks)
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#multipaths = filter(lambda d: d in devices, multipaths)
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partition_devices = filter(lambda d: d in devices, partition_devices)
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mpathStr = "["
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for mpath in multipaths:
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mpathStr += str([d['name'] for d in mpath])
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mpathStr += "]"
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s = "(%s, %s, %s)" % ([d['name'] for d in singlepath_disks], \
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mpathStr, \
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[d['name'] for d in partition_devices])
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log.info("devices post multipath scan: %s" % s)
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return (singlepath_disks, multipaths, partition_devices)
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class MultipathConfigWriter:
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def __init__(self):
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self.blacklist_devices = []
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self.mpaths = []
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def addBlacklistDevice(self, device):
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self.blacklist_devices.append(device)
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def addMultipathDevice(self, mpath):
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self.mpaths.append(mpath)
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def write(self):
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# if you add anything here, be sure and also add it to anaconda's
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# multipath.conf
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ret = ''
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ret += """\
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# multipath.conf written by anaconda
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defaults {
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user_friendly_names yes
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}
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blacklist {
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devnode "^(ram|raw|loop|fd|md|dm-|sr|scd|st)[0-9]*"
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devnode "^hd[a-z]"
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devnode "^dcssblk[0-9]*"
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device {
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vendor "DGC"
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product "LUNZ"
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}
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device {
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vendor "IBM"
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product "S/390.*"
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}
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# don't count normal SATA devices as multipaths
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device {
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vendor "ATA"
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}
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# don't count 3ware devices as multipaths
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device {
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vendor "3ware"
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}
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device {
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vendor "AMCC"
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}
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# nor highpoint devices
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device {
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vendor "HPT"
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}
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"""
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for device in self.blacklist_devices:
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if device.serial:
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ret += '\twwid %s\n' % device.serial
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elif device.vendor and device.model:
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ret += '\tdevice {\n'
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ret += '\t\tvendor %s\n' % device.vendor
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ret += '\t\tproduct %s\n' % device.model
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ret += '\t}\n'
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ret += '}\n'
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ret += 'multipaths {\n'
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for mpath in self.mpaths:
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ret += '\tmultipath {\n'
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for k,v in mpath.config.items():
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ret += '\t\t%s %s\n' % (k, v)
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ret += '\t}\n'
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ret += '}\n'
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return ret
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