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In some occasional case dmevent restart was experiencing problems
with obtaining pid lockfile. So this patch tries to send several more kill
message until daemon kills itself so there is would reponse.
With this small loop the restart seems to work reliable,
although the loopsize and usleep are just randomly picked for now.
various dmeventd plug-ins into a new function called 'dmeventd_lvm2_command',
but the new function did not strip off the "_mlog" extentions that the
mirror plug-in had been doing. This created bug 794904 - failure to replace
devices in a redundant log.
The test suite did catch this scenario because it performs repair tests (mainly)
through the CLI and not dmeventd. It's also not easy to test because the test
itself will hang if the bug is encountered.
LISTEN_PID and LISTEN_FDS environment variables are defined only during systemd
"start" action. But we still need to know whether we're activated during
"reload" action as well - we use the reload action to call "dmeventd -R"/"lvmetad -R"
for statefull daemon restart. We can't use normal "restart" as that is simply
composed of "stop" and "start" and we would lose any state the daemon has.
As atoi may return negative value - test for both limits.
Test log_args for limits before calling alloca().
Code from dmeventd mirror plugin should probably share same code as
we have in mirrored.c.
For snapshot, prepare whole command in front into private buffer.
Add also some missing '\n' for syslog messages.
For raid and mirror only convert creation of command line string.
This should avoid any unbound growth of mempool for dm_split_names.
Fix some minor outstading issue from thin plugin introduction -
Call dmeventd_lvm2_exit() in failpath for registration.
Add some missing '\n' in syslog messages.
The RAID plug-in for dmeventd now calls 'lvconvert --repair' to address failures
of devices in a RAID logical volume. The action taken can be either to "warn"
or "allocate" a new device from any spares that may be available in the
volume group. The action is designated by setting 'raid_fault_policy' in
lvm.conf - the default being "warn".
udev may also need to be disabled if you didn't build it statically too.
dmeventd.static could be fixed with some more work but I don't really see the
point: without dlopen() it's useless, and if you have dlopen(), why not support
normal shared libraries too?
monitoring state of the logical volumes they are currently acting on.
Until now, every time a logical volume has been changed by a dmeventd plugin,
this plugin would have called back to dmeventd through the external FIFO
mechanism. I am fairly sure this was superfluous, inefficient and possibly even
dangerous.
