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Udev events can come in like a flood when something changes. It really
doesn't do us any good to refresh the state of the service numerous times
when 1 would suffice. We had something like this before, but it was
removed when we added the refresh thread. However, we have since learned
that we need to sequence events in the correct order and block dbus
operations if we believe the state has been affected, thus udev events are
being processed on the main work queue. This change limits spurious
work items from getting to the queue.
If we always disable the sending of notify dbus events then in the case
where all the users are lvm dbus users we will be in udev handling mode
until at least 1 external lvm command occurs. Instead we will not disable
notify dbus until after we get at least 1 external event. This makes the
service get into the correct mode of operation faster.
Previous commit 506d88a2ec introduced disabling lvmetad on repairs.
Avoid calling lvscan and use of any --config options altogether
in the mirror and raid DSOs.
Related: rhbz1380521
Repairing missing devices does not work reliably
with lvmetad, so disable lvmetad before repair.
A standard lvmetad refresh (pvscan --cache) will
enable lvmetad again.
Commit 07ded8059c assumed that the mirror is blocked which is not the case.
It is accessible, degraded and in need of repair because some of its legs
(partially) failed. Any auto-repair via dmeventd fails though because
of lvmetad not providing proper data about the failed PV(s). That's why
this workaround got introduced in commit 76f6951c3e until we get to
the lvmetad interaction core issue.
Mind any mirror auto-repair failure is caused by such lvmetad interaction
problems not yet solved so disabling lvmetad works as a resort as elaborated
on in the related bz.
Reintroducing the interim solution.
Resolves: rhbz1380521
Effectively revert whole 76f6951c3e.
We need to figure out some other solution.
At this moment usage of --config with 'repair' of blocked mirror
is 'freezing' combination.
Require that the path argument to dmfilemapd be an absolute path
and document this in tool output, libdevmapper.h and dmfilemapd.8.
The check is also enforced by dm_stats_start_filemapd() to avoid
forking a new process with an invalid path argument.
The initial check on argc incorrectly returns 1 when the wrong
number of arguments are present, causing a segfault in main()
when no arguments are given:
# dmfilemapd
Wrong number of arguments.
usage: dmfilemapd <fd> <group_id> <path> <mode> [<foreground>[<log_level>]]
Segmentation fault (core dumped)
Utilizing the --config option we will utilize global/notify_dbus=0 so
that the service itself doesn't generate change events which it then needs to
process.
We need to place query operations in the queue to prevent the case where
a client knows of something before the service does. For example if a
client creates a PV/VG/LV outside of the dbus API and then immediately
tries to lookup and use that resource in the lvm dbus service it should
be present. By placing the queries in the work queue any previous
refresh operation will complete before we process the query.
The filemap daemon takes its program_id from the regions it is
managing: use DM_STATS_ALL_PROGRAMS when retrieving an initial
listing and then obtain the correct program_id from the group
leader.
Automatic dmeventd repair of mirrors with active lvmetad configured
(mirror_image_fault_policy = "allocate") fails because the lvscan
run before the repair in the mirror DSO does not update the
lvmetad cache properly thus "lvconvert --repair ..." fails.
Need to scan the mirror LV before and after the repair
to have proper cache content after the repair finished.
The cache can't be relied on or the repair will fail.
Resolves: rhbz1380521
Add a daemon that can be launched to monitor a group of regions
corresponding to the extents of a file, and to update the regions as the
file's allocation changes.
The daemon is intended to be started from a library interface, but can
also be run from the command line:
dmfilemapd <fd> <group_id> <path> <mode> [<foreground>[<log_level>]]
Where fd is a file descriptor open on the mapped file, group_id is the
group identifier of the mapped group and mode is either "inode" or
"path". E.g.:
# dmfilemapd 3 0 vm.img inode 1 3 3<vm.img
...
If foreground is non-zero, the daemon will not fork to run in the
background. If verbose is non-zero, libdm and daemon log messages will
be printed.
It is possible for the group identifier to change when regions are
re-mapped: this occurs when the group leader is deleted (regroup=1 in
dm_stats_update_regions_from_fd()), and another region is created before
the daemon has a chance to recreate the leader region.
The operation is inherently racey since there is currently no way to
atomically move or resize a dm_stats region while retaining its
region_id.
Detect this condition and update the group_id value stored in the
filemap monitor.
A function is also provided in the the stats API to launch the filemap
monitoring daemon:
int dm_stats_start_filemapd(int fd, uint64_t group_id, const char *path,
dm_filemapd_mode_t mode, unsigned foreground,
unsigned verbose);
This carries out the first fork and execs dmfilemapd with the arguments
specified.
A dm_filemapd_mode_t value is specified by the mode argument: either
DM_FILEMAPD_FOLLOW_INODE, or DM_FILEMAPD_FOLLOW_PATH. A helper function,
dm_filemapd_mode_from_string(), is provided to parse a string containing
a valid mode name into the appropriate dm_filemapd_mode_t value.
Some archs can use even 64K pages and then lvm2 runs into trouble if
the stack is 'too small' to fit extra page capturing stack overwrite.
So when lvm2 limits stack - add extra mem page - be it 4K or 64K.
Relates to ppc64le bug: https://bugzilla.redhat.com/1387279
For more advanced support we need to ensure better logic for calling
external much more advanced script for maintanance of thin-pool.
So this new code ensures:
When thin-pool data or metadata is bigger then 50%,
then with each 5% increment, action is called.
This is independent from autoextend_threshold.
This action always happens when thin-pool is over threshold,
(so no action when it's exactly i.e. 60%).
The only exception is 100% full thin-pool - which invokes 'last'
action.
Since thin-pool occupancy may change also downward, code needs
to also handle possibly reduction of occupancy of thin-pool.
So when usage drop from 90% to 50%, thin-pool will start to call
again action when it will pass 55% threshold.
This give external commands lot of option i.e. to call 'fstrim'
before actual resize is needed.
Default internal logic will stop trying to do any 'rescue' action
when executed command fails.
This will be now fully in hands of external script if such
behaviour is needed.
Instead of stopping monitoring after couple failing retries,
keep monitoring forever, just make larger delays between command
retries (ATM upto ~42 minutes).
So syslog is not spammed too often, yet commands have a chance to
be retried and succeed eventually...
When dmeventd configured command does not start with 'lvm ' prefix,
it's going to be an 'external' command.
In this case we split command by spaces to argv strings.
When thin-pool processes event and 'lvextend --use-policies' fails
rather capture up-to-date new info as the fullness percentage may
have jumped noticable. This way we could use 'more' correct numbers
when checking for thresholds.
The function timeout_add_seconds has quite a bit of variability. Using
timeout_add which specifies the timeout in ms instead of seconds. Testing
shows that this is much more consistent which should improve clients that
are using shorter timeouts for the API and the connection.
Added a properties changed signal on the job dbus object so that client
can wait for a signal that the job is complete instead of polling or
blocking on the wait method.
Allows the user to override the number of commands that get dumped
to the log when we encounter a lvm error. Also useful during
development when you don't want to see the blackbox output.
When reading data from stdout & stderr we were reading until the
reading until we got None back which really isn't needed as the
read will return everything that is available.
We need to acquire a lock which can block us which in turn causes
the dbus request handling to block as well. Place the request on
the work queue instead.
Our expectation was that when using the lvm shell that when the lvm prompt
was read from stdout, that all other ouput had been written and flushed.
However, this doesn't appear to be the case. Add extra read passes to
retrieve delayed report data.
In preparation to have more than one thread issuing commands to lvm
at the same time we need to serialize updates to the dbus state and
retrieving the global lvm state. To achieve this we have one thread
handling this with a thread safe queue taking and coalescing requests.
This code is no longer needed because the back ground task has been
removed. Will add back if we change the design and end up utilizing
multiple worker threads.
There is no reason to create another background task when the task that
created it is going to block waiting for it to finish. Instead we will
just execute the logic in the worker thread that is servicing the worker
queue.
Translate log_info() into log_very_verbose() which is macro
supposed to be used by our code.
log_info() is internal macro with eventually some 'symbolic' meaning
in syslogging daemons.
Ensure different logging function for dmeventd.c logging
and dm and lvm library.
We can recognize we want to show every log_info() and
log_notice() message from dmeventd.c code while not
exposing those from libdm/libdevmapper-event
Also switch to use log with errno - it's not changing
anything and doesn't bring any more features yet to dmeventd
logging but we just properly pass dm_errno_or_class properly
through the whole code stack for possible future use
(i.e. support of class logging for dmeventd).
Reword the logging logic and try to restore previous logging
behavior for 'standalone' running daemon while preserving
debuggable feautures it has gained.
So actual rules:
dmeventd without any '-d' option will syslog all messages
from dmeventd.c it dmeventd plugins.
log_notice()==log_verbose()
log_info()==log_very_verbose()
But to show also log_debug() used has to give '-ddd'.
When user specified '-d, -dd, -ddd, -dddd' it
will also enable tracing of messages from libdm & lib
executed code - which is mainly useful for testing
i.e.: 'dmeventd -fldddd'
Introduce macros:
log_level(), log_stderr(), log_once(), log_bypass_report()
For easier and more consisten way how to 'decoder' bits
of info from passed 'level'.
This patch fixes potential problem when 'level' of message
might not have always masked right bits.
Instead of creating a thread to handle the case where a client
is calling job.Wait, we will utilize a timer. This significantly
reduces the number of threads that get created and destroyed while
the service is running.
We will fetch the lvm state in non-main thread and only process the new
data with the main thread to prevent hanging the main thread event loop.
ref. https://bugs.freedesktop.org/show_bug.cgi?id=98521
The following LvCommon properties were added so that the API
would have the same functionality as lvm2app has.
LvCommon.MetaDataSizeBytes
LvCommon.Attr
LvCommon.MetaDataPercent
LvCommon.CopyPercent
LvCommon.SnapPercent
LvCommon.SyncPercent
Integrate back _unblock_sigalrm() and check for error code of
pthread_sigmask() function so we do not use uninitialized
sigmask_t on error path (Coverity).
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.
The object manager method get_object_by_lvm_id was used in many cases for
the sole reason of getting the object path for the object. Instead of
retrieving the object and then calling 'dbus_object_path' on the object, we
are adding a method which returns the object path.
When we are processing the LVs we need to build up dbus objects from least
dependent to most dependent, so that we have information available when
constructing.
If a command gets stuck during an lvmetad update, lvmetad
will cancel that update after the timeout. The next command
to check the lvmetad will see that lvmetad needs to be
populated because lvmetad will return token of "none" after
a timed out update (same as when lvmetad is not populated
at all after starting.)
If a command gets an error during an lvmetad update, it
will now just quit and leave its updating token in place.
That update will be cancelled after the timeout.
All the variables for sscanf in lvmlockctl.c and lvmlockd-sanlock.c are
zeroed before sscanf call so the failure is detected by seeing the zero
value instead of proper one in subsequent code - so use (void) for
sscanf calls to ignore return value here.
If a command begins repopulating the lvmetad cache,
and fails part way through, it should set the disabled
state in lvmetad so other commands don't use bad data.
If a subsequent scan succeeds, the disabled state is
cleared.
When duplicate PVs are detected, set the disabled
flag so that commands will disable use of lvmetad.
This duplicate detection is done by lvmetad itself
when it's told about a single new PV with a PVID
that matches an existing PV on another device.
(This is different from the case where the command
is scanning all devices and detects the duplicate.)
Remove the "altdev" logic that attempted to keep
track of multiple devices for a single PV. It
is no longer used since lvmetad is disabled in
this case.
A global flag in lvmetad indicates it has been disabled.
Other flags indicate the reason it was disabled.
These flags can be queried using get_global_info.
The lvmetactl debugging utility can set and clear the
disabled flag in lvmetad. Nothing else sets the
disabled flag yet.
Commands will check these flags after connecting to
lvmetad. If the disabled flag is set, the command
will not use the lvmetad cache, but revert to disk
scanning.
To test this feature:
$ lvmetactl get_global_info
response = "OK"
global_invalid = 0
global_disable = 0
disable_reason = "none"
token = "filter:3041577944"
$ vgs
(should report VGs from lvmetad)
$ lvmetactl set_global_disable 1
$ lvmetactl get_global_info
response = "OK"
global_invalid = 0
global_disable = 1
disable_reason = "DIRECT"
token = "filter:3041577944"
$ vgs
WARNING: Not using lvmetad because the disable flag was set directly.
(should report VGs without contacting lvmetad)
$ lvmetactl set_global_disable 0
$ vgs
(should report VGs from lvmetad)
Move checking the lvmetad state, and the possible rescan,
out of lvmetad_send() to the start of the command.
Previously, the token mismatch and rescan would occur
within lvmetad_send() for some other request. Now,
the token mismatch is detected earlier, so the
rescan can be done before the main command is in
progress. Rescanning deep within the processing of
another command will disturb the lvmcache state of
that other command.
A rescan already exists at the start of the command
for the case where foreign VGs are going to be read.
This same rescan is now also performed when there is
an lvmetad token mismatch (from a changed global_filter).
The commands pvscan/vgscan/lvscan/vgimport are excluded
from this preemptive checking/rescanning for lvmetad
because they want to do rescanning themselves explicitly.
If rescanning devices fails, then lvmetad has not been
correctly repopulated and should not be used, so make
the command revert to not using lvmetad.
To help out with debug, when an exception is thrown in the dbus service we
will dump all the information we have on the last 16 commands that were
executed along with the stack strace.
Signed-off-by: Tony Asleson <tasleson@redhat.com>
While running on F24 a number of warnings were being emitted from using the
deprecated GObject instead of GLib. Tested on python 3.4 and 3.5.
Signed-off-by: Tony Asleson <tasleson@redhat.com>
Python 3.5 in F24 was throwing the following exception:
Traceback (most recent call last):
File "/usr/lib/python3.5/site-packages/lvmdbusd/main.py", line 73, in process_request
req.run_cmd()
File "/usr/lib/python3.5/site-packages/lvmdbusd/request.py", line 73, in run_cmd
self.register_error(-1, st)
File "/usr/lib/python3.5/site-packages/lvmdbusd/request.py", line 123, in register_error
self._reg_ending(None, error_rc, error)
File "/usr/lib/python3.5/site-packages/lvmdbusd/request.py", line 115, in _reg_ending
self.cb_error(self._rc_error)
File "/usr/lib64/python3.5/site-packages/dbus/service.py", line 669, in <lambda>
keywords[error_callback] = lambda exception: _method_reply_error(connection, message, exception)
File "/usr/lib64/python3.5/site-packages/dbus/service.py", line 293, in _method_reply_error
exception))
File "/usr/lib64/python3.5/traceback.py", line 136, in format_exception_only
return list(TracebackException(etype, value, None).format_exception_only())
File "/usr/lib64/python3.5/traceback.py", line 442, in __init__
if (exc_value and exc_value.__cause__ is not None
AttributeError: 'str' object has no attribute '__cause__'
This was caused because we were calling the dbus error callback with a
string instead of an actual exception. On python 3.4 this was apparently
OK, but not with 3.5. Corrected to pass the exception to error callback.
Change tested on both python 3.4 and 3.5.
Reported-by: Vratislav Podzimek <vpodzime@redhat.com>
Signed-off-by: Tony Asleson <tasleson@redhat.com>
When we use udev or have lvm call back into the dbus service when a
change occurs, even if that change originated from the dbus service
we end up refreshing the state of the system twice which is not
needed or wanted. This change handles this case by removing any
pending refreshes in the worker queue if the state of the system
was just updated.
Signed-off-by: Tony Asleson <tasleson@redhat.com>
Use #define instead, since we do not require actually buffer needs
to exists to eliminated new gcc6 warning:
clvm.h:53:19: warning: ‘CLVMD_SOCKNAME’ defined but not used
[-Wunused-const-variable]
