Qubes/core-admin
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

storage/lvm: fix logic regarding snapshots, start, stop etc

Browse Source 
There are mutiple cases when snapshots are inconsistently created, for
example:
 - "-back" snapshot created from the "new" data, instead of old one
 - "-snap" created even when volume.snap_on_start=False
 - probably more

Fix this by following volume.snap_on_start and volume.save_on_stop
directly, instead of using abstraction of old volume types.

QubesOS/qubes-issues#2256
This commit is contained in:
Marek Marczykowski-Górecki 2016-11-04 12:49:07 +01:00
parent ab9d7fbb76
commit 1a7f2892d1
No known key found for this signature in database
GPG Key ID: 063938BA42CFA724
1 changed files with 26 additions and 32 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

58
qubes/storage/lvm.py
View File

@ -59,17 +59,18 @@ class ThinPool(qubes.storage.Pool):
assert volume.rw, msg
assert hasattr(volume, '_vid_snap')
cmd = ['remove', volume.vid + "-back"]
qubes_lvm(cmd, self.log)
cmd = ['clone', volume._vid_snap, volume.vid + "-back"]
try:
cmd = ['remove', volume.vid + "-back"]
qubes_lvm(cmd, self.log)
except qubes.storage.StoragePoolException:
pass
cmd = ['clone', volume.vid, volume.vid + "-back"]
qubes_lvm(cmd, self.log)
cmd = ['remove', volume.vid]
qubes_lvm(cmd, self.log)
cmd = ['clone', volume._vid_snap, volume.vid]
qubes_lvm(cmd, self.log)
cmd = ['remove', volume._vid_snap]
qubes_lvm(cmd, self.log)
@property
def config(self):
@ -83,16 +84,16 @@ class ThinPool(qubes.storage.Pool):
def create(self, volume):
assert volume.vid
assert volume.size
if volume.source:
# will clone in start()
return volume
elif not volume._is_volatile:
cmd = [
'create',
self._pool_id,
volume.vid.split('/', 1)[1],
str(volume.size)
]
if volume.save_on_stop:
if volume.source:
cmd = ['clone', str(volume.source), volume.vid]
else:
cmd = [
'create',
self._pool_id,
volume.vid.split('/', 1)[1],
str(volume.size)
]
qubes_lvm(cmd, self.log)
reset_cache()
return volume
@ -173,14 +174,12 @@ class ThinPool(qubes.storage.Pool):
if volume.save_on_stop:
cmd = ['clone', volume.vid, new_vid]
qubes_lvm(cmd, self.log)
if volume.save_on_stop or volume._is_volatile:
cmd = ['remove', volume.vid]
qubes_lvm(cmd, self.log)
volume.vid = new_vid
if not volume._is_volatile:
if volume.snap_on_start:
volume._vid_snap = volume.vid + '-snap'
reset_cache()
return volume
@ -222,29 +221,24 @@ class ThinPool(qubes.storage.Pool):
pass # TODO Should we create a non existing pool?
def start(self, volume):
if volume._is_snapshot:
self._snapshot(volume)
elif volume._is_volatile:
self._reset_volume(volume)
else:
if not self.is_dirty(volume):
if volume.snap_on_start:
if not volume.save_on_stop or not self.is_dirty(volume):
self._snapshot(volume)
elif not volume.save_on_stop:
self._reset_volume(volume)
reset_cache()
return volume
def stop(self, volume):
if volume.save_on_stop:
if volume.save_on_stop and volume.snap_on_start:
self._commit(volume)
if volume._is_snapshot:
if volume.snap_on_start:
cmd = ['remove', volume._vid_snap]
qubes_lvm(cmd, self.log)
elif volume._is_volatile:
elif not volume.save_on_stop:
cmd = ['remove', volume.vid]
qubes_lvm(cmd, self.log)
else:
cmd = ['remove', volume._vid_snap]
qubes_lvm(cmd, self.log)
reset_cache()
return volume
@ -355,7 +349,7 @@ class ThinVolume(qubes.storage.Volume):
raise qubes.storage.StoragePoolException(msg)
self.path = '/dev/' + self.vid
if not self._is_volatile:
if self.snap_on_start:
self._vid_snap = self.vid + '-snap'
self._size = size
@ -401,7 +395,7 @@ class ThinVolume(qubes.storage.Volume):
''' Return :py:class:`qubes.devices.BlockDevice` for serialization in
the libvirt XML template as <disk>.
'''
if not self._is_volatile:
if self.snap_on_start:
return qubes.devices.BlockDevice(
'/dev/' + self._vid_snap, self.name, self.script,
self.rw, self.domain, self.devtype)