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git://sourceware.org/git/lvm2.git
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94dde57699
If something manually copies a PV signature to a block device we will miss it. Handle this case too.
102 lines
2.4 KiB
Python
102 lines
2.4 KiB
Python
# Copyright (C) 2015-2016 Red Hat, Inc. All rights reserved.
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#
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# This copyrighted material is made available to anyone wishing to use,
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# modify, copy, or redistribute it subject to the terms and conditions
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# of the GNU General Public License v.2.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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import pyudev
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import threading
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from . import cfg
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from .request import RequestEntry
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from . import utils
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observer = None
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observer_lock = threading.RLock()
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_udev_lock = threading.RLock()
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_udev_count = 0
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def udev_add():
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global _udev_count
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with _udev_lock:
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if _udev_count == 0:
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_udev_count += 1
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# Place this on the queue so any other operations will sequence
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# behind it
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r = RequestEntry(
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-1, _udev_event, (), None, None, False)
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cfg.worker_q.put(r)
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def udev_complete():
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global _udev_count
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with _udev_lock:
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if _udev_count > 0:
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_udev_count -= 1
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def _udev_event():
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utils.log_debug("Processing udev event")
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udev_complete()
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cfg.load()
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# noinspection PyUnusedLocal
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def filter_event(action, device):
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# Filter for events of interest and add a request object to be processed
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# when appropriate.
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refresh = False
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# Ignore everything but change
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if action != 'change':
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return
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if 'ID_FS_TYPE' in device:
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fs_type_new = device['ID_FS_TYPE']
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if 'LVM' in fs_type_new:
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# If we get a lvm related udev event for a block device
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# we don't know about, it's either a pvcreate which we
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# would handle with the dbus notification or something
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# copied a pv signature onto a block device, this is
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# required to catch the latter.
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if not cfg.om.get_object_by_lvm_id(device['DEVNAME']):
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refresh = True
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elif fs_type_new == '':
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# Check to see if the device was one we knew about
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if 'DEVNAME' in device:
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if cfg.om.get_object_by_lvm_id(device['DEVNAME']):
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refresh = True
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else:
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# This handles the wipefs -a path
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if not refresh and 'DEVNAME' in device:
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if cfg.om.get_object_by_lvm_id(device['DEVNAME']):
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refresh = True
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if refresh:
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udev_add()
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def add():
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with observer_lock:
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global observer
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context = pyudev.Context()
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monitor = pyudev.Monitor.from_netlink(context)
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monitor.filter_by('block')
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observer = pyudev.MonitorObserver(monitor, filter_event)
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observer.start()
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def remove():
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with observer_lock:
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global observer
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if observer:
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observer.stop()
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observer = None
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return True
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return False
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