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When a PV device is missing lvm will return '[unknown]' for the device
path. The object manager keeps a hash table lookup for uuid and for PV's
device name. When we had multiple PVs with the same device path we
we only had 1 key in the table for the lvm id (device path). This caused
a problem when the PV device transitioned from '[unknown]' to known as any
subsequent transitions would cause an exception:
Traceback (most recent call last):
File "/usr/lib/python3.5/site-packages/lvmdbusd/request.py", line 66, in run_cmd
result = self.method(*self.arguments)
File "/usr/lib/python3.5/site-packages/lvmdbusd/manager.py", line 205, in _pv_scan
cfg.load()
File "/usr/lib/python3.5/site-packages/lvmdbusd/fetch.py", line 24, in load
cache_refresh=False)[1]
File "/usr/lib/python3.5/site-packages/lvmdbusd/pv.py", line 48, in load_pvs
emit_signal, cache_refresh)
File "/usr/lib/python3.5/site-packages/lvmdbusd/loader.py", line 80, in common
cfg.om.remove_object(cfg.om.get_object_by_path(k), True)
File "/usr/lib/python3.5/site-packages/lvmdbusd/objectmanager.py", line 153, in remove_object
self._lookup_remove(path)
File "/usr/lib/python3.5/site-packages/lvmdbusd/objectmanager.py", line 97, in _lookup_remove
del self._id_to_object_path[lvm_id]
KeyError: '[unknown]'
when trying to delete a key that wasn't present. In this case we don't add a
lookup key for the device path and the PV can only be located by UUID.
Ref: https://bugzilla.redhat.com/show_bug.cgi?id=1379357
The dm-raid target now rejects device rebuild requests during ongoing
resynchronization thus causing 'lvconvert --repair ...' to fail with
a kernel error message. This regresses with respect to failing automatic
repair via the dmeventd RAID plugin in case raid_fault_policy="allocate"
is configured in lvm.conf as well.
Previously allowing such repair request required cancelling the
resynchronization of any still accessible DataLVs, hence reasoning
potential data loss.
Patch allows the resynchronization of still accessible DataLVs to
finish up by rejecting any 'lvconvert --repair ...'.
It enhances the dmeventd RAID plugin to be able to automatically repair
by postponing the repair after synchronization ended.
More tests are added to lvconvert-rebuild-raid.sh to cover single
and multiple DataLV failure cases for the different RAID levels.
- resolves: rhbz1371717
Gris debugged that when we don't have a method the introspection
data is missing the interface itself eg.
<interface name="<your_obj_iface_name>" />
When adding the properties to the dbus object introspection we will
add the interface too if it's missing. This now allows us the
ability to have a dbus object with only properties.
When we register a failure we need to use a valid value which will be
returned with the object manager. Otherwise we will raise an Exception
because we are trying to construct an object path from None.
The methods were returning an instance of the object instead of the
object path which was causing an exception when the result was returned
with the job object as we are explicity trying to return an object path.
Unit test added which re-creates the issue and verifies the fix.
- Prevent --lvmshell with --nojson, not a valid combination
- If user is preventing json, then no lvmshell usage
- Return boolean on Manager.UseLvmShell
The normal mode of operation will be to monitor for udev events until an
ExternalEvent occurs. In that case the service will disable monitoring
for udev events and use ExternalEvent exclusively.
Note: User specifies --udev the service will always monitor udev regardless
if ExternalEvent is being called too.
With the addition of JSON and the ability to get output which is known to
not contain any extraneous text we can now leverage lvm shell, so that we
don't fork and exec lvm command line repeatedly.
When we are running in a terminal it's useful to have a date & ts on log
output like you get when output goes to the journal. Check if we are
running on a tty and if we are, add it in.
When converting to a cache lv, tests were hanging with a prompt for
"Do you want wipe existing metadata of cache pool volume
To preserve cache metadata add option "--zero n".
WARNING: Reusing mismatched cache pool metadata MAY DESTROY YOUR DATA!"
This is new.
When a client is doing a wait on a job, any other clients will hang
when trying to do anything with the service. This is caused by
the wait code which was placing the thread that handles
incoming dbus requests to sleep until either the timeout expired or
the job operation completed.
This change creates a thread for the wait request, so that the thread
processing incoming requests can continue to run.
If the VG holding the global lock is removed, we can indicate
that as the reason for not being able to acquire the global
lock in subsequent error messages, and can suggest enabling
the global lock in another VG. (This helpful error message
will go away if the global lock is enabled in another VG,
or if lvmlockd is restarted.)
Run umount code only when either thin data or metadata are
above 95% - so if there are resize failures with 60%.
system fill keep running.
Also umount will only be tried with lvm2 LVs.
Foreign users are ATM unsuppored.
We call 'lvm help' to find out if fullreport is supported. Lvm
dumps help to stderr. Common code prints a warning if we exit
with 0, but have something in stderr so we are skipping the warning
message.
The following operations would hang if lvm was compiled with
'enable-notify-dbus' and the client specified -1 for the timeout:
* LV snapshot merge
* VG move
* LV move
This was caused because the implementation of these three dbus methods is
different. Most of the dbus method calls are executed by gathering information
needed to fulfill it, placing that information on a thread safe queue and
returning. The results later to be returned to the client with callbacks.
With this approach we can process an arbitrary number of commands without any
of them blocking other dbus commands. However, the 3 dbus methods listed
above did not utilize this functionality because they were implemented with a
separate thread that handles the fork & exec of lvm. This is done because these
operations can be very slow to complete. However, because of this the lvm
command that we were waiting on is trying to call back into the dbus service to
notify it that something changed. Because the code was blocking the process
that handles the incoming dbus activity the lvm command blocked. We were stuck
until the client timed-out the connection, which then causes the service to
unblock and continue. If the client did not have a timeout, we would have been
hung indefinitely.
The fix is to always utilize the worker queue on all dbus methods. We need to
ensure that lvm is tested with 'enable-notify-dbus' enabled and disabled.
Previously, a command sent lvmetad new VG metadata in vg_commit().
In vg_commit(), devices are suspended, so any memory allocation
done by the command while sending to lvmetad, or by lvmetad while
updating its cache could deadlock if memory reclaim was triggered.
Now lvmetad is updated in unlock_vg(), after devices are resumed.
The new method for updating VG metadata in lvmetad is in two phases:
1. In vg_write(), before devices are suspended, the command sends
lvmetad a short message ("set_vg_info") telling it what the new
VG seqno will be. lvmetad sees that the seqno is newer than
the seqno of its cached VG, so it sets the INVALID flag for the
cached VG. If sending the message to lvmetad fails, the command
fails before the metadata is committed and the change is not made.
If sending the message succeeds, vg_commit() is called.
2. In unlock_vg(), after devices are resumed, the command sends
lvmetad the standard vg_update message with the new metadata.
lvmetad sees that the seqno in the new metadata matches the
seqno it saved from set_vg_info, and knows it has the latest
copy, so it clears the INVALID flag for the cached VG.
If a command fails between 1 and 2 (after committing the VG on disk,
but before sending lvmetad the new metadata), the cached VG retains
the INVALID flag in lvmetad. A subsequent command will read the
cached VG from lvmetad, see the INVALID flag, ignore the cached
copy, read the VG from disk instead, update the lvmetad copy
with the latest copy from disk, (this clears the INVALID flag
in lvmetad), and use the correct VG metadata for the command.
(This INVALID mechanism already existed for use by lvmlockd.)
Reconnect to lvmetad if either the send fails (e.g. lvmetad
was restarted since lvmlockd last connected), or if no
lvmetad connection exists (e.g. lvmetad was started after
lvmlockd so no previous connection existed.)
Previously, vgcfgrestore would attempt to vg_remove the
existing VG from lvmetad and then vg_update to add the
restored VG. But, if there was a failure in the command
or with vg_update, the lvmetad cache would be left incorrect.
Now, disable lvmetad before the restore begins, and then
rescan to populate lvmetad from disk after restore has
written the new VG to disk.
We were initially looking to see if an LV was hidden and if it was we were
creating an instance of a LvCommon object to represent it. Thus if we
had a hidden cache pool for example we were missing the methods and
properties for the cache pool. However, when we create the object path,
any hidden LVs, regardless of type/functionality will be placed in the
hidden path.
