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lvmdbusd: Correct object manager lookups

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When we have two logical volumes which switch their names at the
same time we are left with incorrect lookups.  Anytime we find
an entry by doing a lookup by UUID or by name we will ensure
that the lookups are indeed correct.

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1642176
This commit is contained in:
Tony Asleson 2019-01-16 15:27:55 -06:00
parent 1ed4b3f23b
commit b4c3382990
1 changed files with 15 additions and 35 deletions
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50
daemons/lvmdbusd/objectmanager.py
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@ -189,8 +189,8 @@ class ObjectManager(AutomatedProperties):
path = dbus_object.dbus_object_path()
interfaces = dbus_object.interface()
# print 'UN-Registering object path %s for %s' % \
# (path, dbus_object.lvm_id)
# print('UN-Registering object path %s for %s' %
# (path, dbus_object.lvm_id))
self._lookup_remove(path)
@ -240,39 +240,19 @@ class ObjectManager(AutomatedProperties):
return lookup_rc
return '/'
def _uuid_verify(self, path, uuid, lvm_id):
def _id_verify(self, path, uuid, lvm_id):
"""
Ensure uuid is present for a successful lvm_id lookup
Ensure our lookups are correct
NOTE: Internal call, assumes under object manager lock
:param path: Path to object we looked up
:param uuid: lvm uuid to verify
:param lvm_id: lvm_id used to find object
:param uuid: uuid lookup
:param lvm_id: lvm_id lookup
:return: None
"""
# This gets called when we found an object based on lvm_id, ensure
# uuid is correct too, as they can change. There is no durable
# non-changeable name in lvm
# There is no durable non-changeable name in lvm
if lvm_id != uuid:
if uuid and uuid not in self._id_to_object_path:
obj = self.get_object_by_path(path)
self._lookup_add(obj, path, lvm_id, uuid)
def _lvm_id_verify(self, path, uuid, lvm_id):
"""
Ensure lvm_id is present for a successful uuid lookup
NOTE: Internal call, assumes under object manager lock
:param path: Path to object we looked up
:param uuid: uuid used to find object
:param lvm_id: lvm_id to verify
:return: None
"""
# This gets called when we found an object based on uuid, ensure
# lvm_id is correct too, as they can change. There is no durable
# non-changeable name in lvm
if lvm_id != uuid:
if lvm_id and lvm_id not in self._id_to_object_path:
obj = self.get_object_by_path(path)
self._lookup_add(obj, path, lvm_id, uuid)
obj = self.get_object_by_path(path)
self._lookup_add(obj, path, lvm_id, uuid)
def _id_lookup(self, the_id):
path = None
@ -339,22 +319,22 @@ class ObjectManager(AutomatedProperties):
# Lets check for the uuid first
path = self._id_lookup(uuid)
if path:
# Verify the lvm_id is sane
self._lvm_id_verify(path, uuid, lvm_id)
# Ensure table lookups are correct
self._id_verify(path, uuid, lvm_id)
else:
# Unable to find by UUID, lets lookup by lvm_id
path = self._id_lookup(lvm_id)
if path:
# Verify the uuid is sane
self._uuid_verify(path, uuid, lvm_id)
# Ensure table lookups are correct
self._id_verify(path, uuid, lvm_id)
else:
# We have exhausted all lookups, let's create if we can
if path_create:
path = path_create()
self._lookup_add(None, path, lvm_id, uuid)
# print('get_object_path_by_lvm_id(%s, %s, %s, %s: return %s' %
# (uuid, lvm_id, str(path_create), str(gen_new), path))
# print('get_object_path_by_lvm_id(%s, %s, %s): return %s' %
# (uuid, lvm_id, str(path_create), path))
return path