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import resources as Res
import uuid
import re
import time
import rcStatus
import rcExceptions as ex
from rcUtilities import which
from subprocess import *
from rcGlobalEnv import rcEnv
hostId = __import__('hostid'+rcEnv.sysname)
class ScsiReserv(Res.Resource):
"""Define method to acquire and release scsi SPC-3 persistent reservations
on disks held by a service
"""
def __init__(self,
rid=None,
peer_resource=None,
no_preempt_abort=False,
prkey=None,
**kwargs):
self.no_preempt_abort = no_preempt_abort
self.disks = set([])
self.preempt_timeout = 10
self.prtype = '5'
self.hostid = None
self.peer_resource = peer_resource
self.prkey = prkey
Res.Resource.__init__(self,
rid=rid+"pr",
type="disk.scsireserv",
**kwargs)
def set_label(self):
self.get_disks()
if len(self.disks) == 0:
self.label = 'preserv 0 scsi disk'
elif len(', '.join(self.disks)) > 248:
self.label = 'preserv '+', '.join(self.disks)[0:248]
self.label += " ..."
else:
self.label = ', '.join(self.disks)
def get_hostid(self):
if self.hostid:
return
if self.prkey:
self.hostid = self.prkey
return
try:
self.hostid = self.svc.node.get_prkey()
except Exception as e:
raise ex.excError(str(e))
def info(self):
self.get_hostid()
data = [
[self.svc.svcname, self.svc.node.nodename, self.svc.clustertype, self.rid, "prkey", self.hostid],
]
return data
def scsireserv_supported(self):
return False
def ack_unit_attention(self, d):
raise ex.notImplemented
def disk_registered(self, disk):
raise ex.notImplemented
def disk_register(self, disk):
raise ex.notImplemented
def disk_unregister(self, disk):
raise ex.notImplemented
def get_reservation_key(self, disk):
raise ex.notImplemented
def disk_reserved(self, disk):
raise ex.notImplemented
def disk_release(self, disk):
raise ex.notImplemented
def disk_reserve(self, disk):
raise ex.notImplemented
def disk_preempt_reservation(self, disk, oldkey):
if not hasattr(self, '_disk_preempt_reservation'):
raise ex.notImplemented
if not self.svc.options.force and not self.svc.options.cluster:
self.log.error("%s is already reserved. use --force to override this safety net"%disk)
raise ex.excError
return self._disk_preempt_reservation(disk, oldkey)
def get_disks(self):
if len(self.disks) > 0:
return
self.disks = self.peer_resource.disklist()
def ack_all_unit_attention(self):
self.get_disks()
for d in self.disks:
try:
if self.ack_unit_attention(d) != 0:
return 1
except ex.excScsiPrNotsupported:
continue
return 0
def register(self):
self.log.debug("starting register. prkey %s"%self.hostid)
self.get_disks()
r = 0
for d in self.disks:
try:
r += self.ack_unit_attention(d)
r += self.disk_register(d)
except ex.excScsiPrNotsupported:
continue
return r
def unregister(self):
self.log.debug("starting unregister. prkey %s"%self.hostid)
self.get_disks()
r = 0
for d in self.disks:
try:
r += self.ack_unit_attention(d)
if not self.disk_registered(d):
continue
r += self.disk_unregister(d)
except ex.excScsiPrNotsupported:
continue
return r
def disk_wait_reservation(self, disk):
for i in range(3, 0, -1):
if self.disk_reserved(disk):
self.log.info("reservation acquired for disk %s" % disk)
return 0
if i > 0:
time.sleep(1)
self.log.error("timed out waiting for reservation for disk %s" % disk)
return 1
def reserve(self):
self.log.debug("starting reserve. prkey %s"%self.hostid)
self.get_disks()
r = 0
for d in self.disks:
try:
r += self.ack_unit_attention(d)
key = self.get_reservation_key(d)
if key is None:
r += self.disk_reserve(d)
elif key == self.hostid:
continue
else:
r += self.disk_preempt_reservation(d, key)
r += self.disk_wait_reservation(d)
except ex.excScsiPrNotsupported:
continue
return r
def release(self):
self.log.debug("starting release. prkey %s"%self.hostid)
self.get_disks()
r = 0
for d in self.disks:
try:
r += self.ack_unit_attention(d)
if not self.disk_reserved(d):
continue
r += self.disk_release(d)
except ex.excScsiPrNotsupported:
continue
return r
def clear(self):
self.log.debug("starting clear. prkey %s"%self.hostid)
self.get_disks()
r = 0
for d in self.disks:
try:
r += self.ack_unit_attention(d)
if not self.disk_reserved(d):
continue
r += self.disk_clear_reservation(d)
except ex.excScsiPrNotsupported:
continue
return r
def checkreserv(self):
self.log.debug("starting checkreserv. prkey %s"%self.hostid)
if self.ack_all_unit_attention() != 0:
return rcStatus.WARN
r = rcStatus.Status()
for d in self.disks:
try:
key = self.get_reservation_key(d)
if key is None:
self.log.debug("disk %s is not reserved" % d)
r += rcStatus.DOWN
elif key != self.hostid:
self.log.debug("disk %s is reserved by another host whose key is %s" % (d, key))
r += rcStatus.DOWN
else:
self.log.debug("disk %s is correctly reserved" % d)
r += rcStatus.UP
except ex.excScsiPrNotsupported:
continue
return r.status
def scsireserv(self):
self.get_hostid()
if not self.scsireserv_supported():
return
r = 0
r += self.register()
r += self.reserve()
return r
def scsirelease(self):
self.get_hostid()
if not self.scsireserv_supported():
return
r = 0
if hasattr(self, 'disk_clear_reservation'):
r += self.clear()
else:
r += self.release()
r += self.unregister()
return r
def scsicheckreserv(self):
self.get_hostid()
if not self.scsireserv_supported():
return
return self.checkreserv()
def _status(self, verbose=False):
self.set_label()
try:
self.get_hostid()
except Exception as e:
self.status_log(str(e))
return rcStatus.WARN
if not self.scsireserv_supported():
return rcStatus.NA
return self.checkreserv()
def start(self):
self.get_hostid()
if not self.scsireserv_supported():
return
if self._status() == rcStatus.UP:
self.log.info("already started")
return
self.can_rollback = True
if self.scsireserv() != 0:
raise ex.excError
def stop(self):
self.get_hostid()
if not self.scsireserv_supported():
return
if self.scsirelease() != 0:
raise ex.excError
def provision(self):
self.start()
def unprovision(self):
self.stop()
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