def _wait_for_udev_events():
# FIXME: This is an ugly hack that is meant to prevent VDSM to report VFs
# that are not yet named by udev or not report all of. This is a blocking
# call that should wait for all udev events to be handled. a proper fix
# should be registering and listening to the proper netlink and udev
# events. The sleep prior to observing udev is meant to decrease the
# chances that we wait for udev before it knows from the kernel about the
# new devices.
time.sleep(0.5)
udevadm.settle(timeout=10)
def _wait_for_udev_events():
# FIXME: This is an ugly hack that is meant to prevent VDSM to report VFs
# that are not yet named by udev or not report all of. This is a blocking
# call that should wait for all udev events to be handled. a proper fix
# should be registering and listening to the proper netlink and udev
# events. The sleep prior to observing udev is meant to decrease the
# chances that we wait for udev before it knows from the kernel about the
# new devices.
time.sleep(0.5)
udevadm.settle(timeout=10)
def _wait_for_events(self):
"""
This is an ugly hack to wait until the udev events generated when
adding or removing a mount are processed.
Note that we may wait for unrelated events, or wait too little if the
system is overloaded.
TODO: find a way to wait for the specific event.
"""
with utils.stopwatch("Waiting for udev mount events", log=self.log):
timeout = config.getint('irs', 'udev_settle_timeout')
udevadm.settle(timeout)
def rescan():
"""
Forces multipath daemon to rescan the list of available devices and
refresh the mapping table. New devices can be found under /dev/mapper
Should only be called from hsm._rescanDevices()
"""
# First rescan iSCSI and FCP connections
iscsi.rescan()
hba.rescan()
# Scanning SCSI interconnects starts a storm of udev events. Wait until all
# events are processed, ensuring detection of new devices and creation or
# update of multipath devices.
timeout = config.getint('irs', 'udev_settle_timeout')
udevadm.settle(timeout)
def detach(self):
if self._path is None:
raise AssertionError("Device is detached: %s" % self)
commands.run(["losetup", "--detach", self._path])
self._path = None
# After deactivating lvs backed by loop device, we get tons of udev
# events. We must wait for the events or we may get stale lvs that
# would fail the next tests.
#
# $ udevadm monitor -u
# ...
# UDEV [314195.642497] remove /devices/virtual/block/dm-4 (block)
# UDEV [314195.643032] remove /devices/virtual/block/dm-4 (block)
# UDEV [314195.653214] remove /devices/virtual/bdi/253:4 (bdi)
# UDEV [314195.664478] remove /devices/virtual/block/dm-5 (block)
# UDEV [314195.664863] remove /devices/virtual/block/dm-5 (block)
# UDEV [314195.674426] remove /devices/virtual/bdi/253:5 (bdi)
# UDEV [314195.807277] change /devices/virtual/block/loop0 (block)
udevadm.settle(5)
def wait_until_ready():
"""
Wait until multipathd is ready after new devices were added.
SCSI rescan or connecting to new target trigger udev events when the
kernel add the new SCSI devices. We can use udevadm to wait for
these events. We see in the logs that udevadm returns quickly,
before multipathd started to process the new devices, but we can use
"multipathd show status" to wait until multipathd processed all the
new devices.
"""
timeout = config.getint('multipath', 'wait_timeout')
start = time.monotonic()
deadline = start + timeout
log.info("Waiting until multipathd is ready")
udevadm.settle(timeout)
# We treat multipath as ready it reaches steady state - reporting
# that it is ready in the last 2 intervals.
ready = 0
tries = 0
while ready < 2:
tries += 1
time.sleep(POLL_INTERVAL)
if is_ready():
ready += 1
else:
ready = 0
if time.monotonic() >= deadline:
log.warning("Timeout waiting for multipathd (tries=%s, ready=%s)",
tries, ready)
return
log.info("Waited %.2f seconds for multipathd (tries=%s, ready=%s)",
time.monotonic() - start, tries, ready)
def detach(self):
if self._path is None:
raise AssertionError("Device is detached: %s" % self)
cmd = ["losetup", "--detach", self._path]
rc, out, err = commands.execCmd(cmd, raw=True)
if rc != 0:
raise cmdutils.Error(cmd, rc, out, err)
self._path = None
# After deactivating lvs backed by loop device, we get tons of udev
# events. We must wait for the events or we may get stale lvs that
# would fail the next tests.
#
# $ udevadm monitor -u
# ...
# UDEV [314195.642497] remove /devices/virtual/block/dm-4 (block)
# UDEV [314195.643032] remove /devices/virtual/block/dm-4 (block)
# UDEV [314195.653214] remove /devices/virtual/bdi/253:4 (bdi)
# UDEV [314195.664478] remove /devices/virtual/block/dm-5 (block)
# UDEV [314195.664863] remove /devices/virtual/block/dm-5 (block)
# UDEV [314195.674426] remove /devices/virtual/bdi/253:5 (bdi)
# UDEV [314195.807277] change /devices/virtual/block/loop0 (block)
udevadm.settle(5)
def connect(self):
iscsi.addIscsiNode(self._iface, self._target, self._cred)
timeout = config.getint("irs", "udev_settle_timeout")
udevadm.settle(timeout)
def settle_devices(cls):
timeout = config.getint("irs", "udev_settle_timeout")
udevadm.settle(timeout)
def connect(self):
iscsi.addIscsiNode(self._iface, self._target, self._cred)
timeout = config.getint("irs", "udev_settle_timeout")
udevadm.settle(timeout)
