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block-device lvm: fix umount phase

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As described in blockdevice.py detachment and (most) resources
release must be done in the umount phase of a block device module.

Until now these jobs were done in the lvm cleanup() phase - which
is too late - especially when using nested LVMs.

This patch moves the functionality of the cleanup() phase to the
umount() phase for the lvm module.
It includes a test case that fails without applying the provided
source code changes.

Change-Id: I697bfbf042816c5ddf170bde9534cc4f0c7279ff
Signed-off-by: Andreas Florath <andreas@florath.net>
This commit is contained in:
Andreas Florath 2017-09-14 05:14:46 +00:00 committed by Ian Wienand
parent e796b3bc18
commit f5736f3178
2 changed files with 24 additions and 22 deletions
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26
diskimage_builder/block_device/level1/lvm.py
View File

@ -155,7 +155,7 @@ class VgsNode(NodeBase):
'devices': self.base,
}
def _cleanup(self):
def _umount(self):
exec_sudo(['vgchange', '-an', self.name])
def get_edges(self):
@ -214,7 +214,7 @@ class LvsNode(NodeBase):
'device': '/dev/mapper/%s-%s' % (self.base, self.name)
}
def _cleanup(self):
def _umount(self):
exec_sudo(['lvchange', '-an',
'/dev/%s/%s' % (self.base, self.name)])
@ -280,19 +280,19 @@ class LVMNode(NodeBase):
for lvs in self.lvs:
lvs._create()
def cleanup(self):
def umount(self):
for lvs in self.lvs:
lvs._cleanup()
lvs._umount()
for vgs in self.vgs:
vgs._cleanup()
vgs._umount()
exec_sudo(['udevadm', 'settle'])
class LVMCleanupNode(NodeBase):
class LVMUmountNode(NodeBase):
def __init__(self, name, state, pvs):
"""Cleanup Node for LVM
"""Umount Node for LVM
Information about the PV, VG and LV is typically
cached in lvmetad. Even after removing PV device and
@ -300,17 +300,17 @@ class LVMCleanupNode(NodeBase):
which leads to a couple of problems.
the 'pvscan --cache' scans the available disks
and updates the cache.
This must be called after the cleanup of the
This must be called after the umount of the
containing block device is done.
"""
super(LVMCleanupNode, self).__init__(name, state)
super(LVMUmountNode, self).__init__(name, state)
self.pvs = pvs
def create(self):
# This class is used for cleanup only
pass
def cleanup(self):
def umount(self):
try:
exec_sudo(['pvscan', '--cache'])
except subprocess.CalledProcessError as cpe:
@ -412,12 +412,12 @@ class LVMPlugin(PluginBase):
# create the "driver" node
self.lvm_node = LVMNode(config['name'], state,
self.pvs, self.lvs, self.vgs)
self.lvm_cleanup_node = LVMCleanupNode(
config['name'] + "-CLEANUP", state, self.pvs)
self.lvm_umount_node = LVMUmountNode(
config['name'] + "-UMOUNT", state, self.pvs)
def get_nodes(self):
# the nodes for insertion into the graph are all of the pvs,
# vgs and lvs nodes we have created above, the root node and
# the cleanup node.
return self.pvs + self.vgs + self.lvs \
+ [self.lvm_node, self.lvm_cleanup_node]
+ [self.lvm_node, self.lvm_umount_node]

20
diskimage_builder/block_device/tests/test_lvm.py
View File

@ -21,9 +21,9 @@ from diskimage_builder.block_device.config import config_tree_to_graph
from diskimage_builder.block_device.config import create_graph
from diskimage_builder.block_device.exception import \
BlockDeviceSetupException
from diskimage_builder.block_device.level1.lvm import LVMCleanupNode
from diskimage_builder.block_device.level1.lvm import LVMNode
from diskimage_builder.block_device.level1.lvm import LVMPlugin
from diskimage_builder.block_device.level1.lvm import LVMUmountNode
from diskimage_builder.block_device.level1.lvm import LvsNode
from diskimage_builder.block_device.level1.lvm import PvsNode
from diskimage_builder.block_device.level1.lvm import VgsNode
@ -89,7 +89,7 @@ class TestLVM(tc.TestGraphGeneration):
# XXX: This has not mocked out the "lower" layers of
# creating the devices, which we're assuming works OK, nor
# the upper layers.
if isinstance(node, (LVMNode, LVMCleanupNode, PvsNode,
if isinstance(node, (LVMNode, LVMUmountNode, PvsNode,
VgsNode, LvsNode)):
# only the LVMNode actually does anything here...
node.create()
@ -198,7 +198,7 @@ class TestLVM(tc.TestGraphGeneration):
# XXX: This has not mocked out the "lower" layers of
# creating the devices, which we're assuming works OK, nor
# the upper layers.
if isinstance(node, (LVMNode, LVMCleanupNode, PvsNode,
if isinstance(node, (LVMNode, LVMUmountNode, PvsNode,
VgsNode, LvsNode)):
# only the PvsNode actually does anything here...
node.create()
@ -282,7 +282,7 @@ class TestLVM(tc.TestGraphGeneration):
self.assertDictEqual(state['blockdev'], blockdev_state)
#
# Cleanup test
# Umount test
#
with mock.patch(exec_sudo) as mock_exec_sudo, \
mock.patch('tempfile.NamedTemporaryFile') as mock_temp, \
@ -308,9 +308,9 @@ class TestLVM(tc.TestGraphGeneration):
reverse_order = reversed(call_order)
for node in reverse_order:
if isinstance(node, (LVMNode, LVMCleanupNode, PvsNode,
if isinstance(node, (LVMNode, LVMUmountNode, PvsNode,
VgsNode, LvsNode)):
node.cleanup()
node.umount()
cmd_sequence = [
# delete the lv's
@ -365,7 +365,7 @@ class TestLVM(tc.TestGraphGeneration):
# XXX: This has not mocked out the "lower" layers of
# creating the devices, which we're assuming works OK, nor
# the upper layers.
if isinstance(node, (LVMNode, LVMCleanupNode,
if isinstance(node, (LVMNode, LVMUmountNode,
PvsNode, VgsNode, LvsNode)):
# only the LVMNode actually does anything here...
node.create()
@ -409,8 +409,9 @@ class TestLVM(tc.TestGraphGeneration):
reverse_order = reversed(call_order)
for node in reverse_order:
if isinstance(node, (LVMNode, PvsNode, VgsNode, LvsNode)):
node.cleanup()
if isinstance(node, (LVMNode, LVMUmountNode,
PvsNode, VgsNode, LvsNode)):
node.umount()
cmd_sequence = [
# deactivate lv's
@ -422,6 +423,7 @@ class TestLVM(tc.TestGraphGeneration):
mock.call(['vgchange', '-an', 'vg_data']),
mock.call(['udevadm', 'settle']),
mock.call(['pvscan', '--cache']),
]
self.assertListEqual(mock_exec_sudo.call_args_list, cmd_sequence)