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When lvmetad is going to be shutdown - there were 2 issue:
If there was endless stream of command contacting lvmetad - the process
would never finish - so now when we recieved SIGTERM - we are no longer
accepting new connections and we just wait till the existing ones are
finished.
2nd. issue is that actually when we are waiting for finish of all client
threads - we basically want an usleep() and check if all threads
are already finished - proper solution would be to singal from a thread
there is some work to do for master thread - but that would be a bigger
change and since lvmetad is no longer developed - keep the change
minimal and just use pselect() as our '1sec.' sleeping call once
we are in 'shutdown' mode.
Reported-by: wangjufeng@huawei.com
Since we are checking _shutdown_requested - we expect all threads
are finished - that is currently checked only by checking ->next ptr
being NULL - so this can be NULL only when _reap() function clears
out all already finished threads.
I'm finding this design quite problematic in its core - but as a
'trivial hotfix' - lets _reap() linked list before check for signal.
There is likely a large potentical for few races - but the windows is
very very small - since lvmetad has been already purged from upstream,
lets go with this hotfix.
To avoid tiny race on checking arrival of signal and entering select
(that can latter remain stuck as signal was already delivered) switch
to use pselect().
If it would needed, we can eventually add extra code for older systems
without pselect(), but there are probably no such ancient systems in
use.
ATM we have several instances of daemonizing code.
Each has its 'special' logic so not completely easy
to unify them all into a single routine.
Start to unify them and use one strategy for rediricting
all input/outpus to /dev/null - use 'dup2' function for this
and open /dev/null before fork to make sure it's available.
Sending %d as format argument in lvmetad_vg_remove_pending() will cause
segfaults in config_make_nodes_v() when va_arg() casts to int64_t. Also, it is
clearly advertised in the lvm source code that using plain %d is prohibited, so
let's switch to FMTd64.
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
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
Currently, a shutdown signal will cause lvmetad to quit
responding to new connections, but not actually exit until
all connections are gone. If a program is maintaining a
long running connection (e.g. lvmlockd, or even an lvm
command) when lvmetad gets a shutdown signal, then all
further commands will hang indefinately waiting for a
response that won't be sent.
With this patch, make lvmetad continue handling new
connections even after a shutdown signal. It will exit
once all connections are gone.
Helping with understanding we will not try to deref NULL pointer,
as if the sizes are initialized to NULL it also means 'mem' would
be NULL, but thats too hard to model so make it obvious.
When lvmetad_pvscan_vg() reads VG metadata from each PV,
it compares it to the last one to verify it matches.
If the VG metadata does not match on the PVs, an error
is printed and it fails to read the VG. In this error
case, use log_debug to show the differences between
the two unmatching copies of the metadata.
Put the change from commit #10d27998b3d2f6100e9e29e83d1d99948c55875f
back so we have working tree again for now. This code needs a bit of
a cleanup to return proper return value to check...
Commit e587b0677b broke the build on
systems where /bin/sh is Dash, for example.
Origin patch by Ferenc Wágner <wferi@niif.hu> changed later to
avoid using shell call, so makefile add 'server' target when
one of metad or polld daemon is requested.
works with systemd activated daemons only as of now
each daemon implementation may decide to signalize its
internal idle state (i.e. all background tasks unrelated to
client threads are finished)
