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Introduce VDO plugin for monitoring VDO devices.
This plugin can be used also by other users, as plugin checks
for UUID prefix 'LVM-' and run lvm actions only on those
devices.
Non LVM- device are only monitored and log warnings
when usage threshold reaches 80%.
The device-mapper directory now holds a copy of libdm source. At
the moment this code is identical to libdm. Over time code will
migrate out to appropriate places (see doc/refactoring.txt).
The libdm directory still exists, and contains the source for the
libdevmapper shared library, which we will continue to ship (though
not neccessarily update).
All code using libdm should now use the version in device-mapper.
As we start refactoring the code to break dependencies (see doc/refactoring.txt),
I want us to use full paths in the includes (eg, #include "base/data-struct/list.h").
This makes it more obvious when we're breaking abstraction boundaries, eg, including a file in
metadata/ from base/
Avoid using same return code for reporting 2 different things
and stricly report error code by return value and add new
parameter for reporting monitoring status.
This makes easier to recognize which error we got from dm_event
and continue only with ENOENT.
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.
Reinstate and extend checks removed by e1b111b02a.
The code has always assumed that only root has access to the directory
containing the fifos and that they are under the complete control of
dmeventd code. If anything is found not to be as expected, then open()
should certainly not be attempted!
Recent change 2c8d6f5c90
actually droped restart when the reason of failing open is missing
device completely - check for ENOENT now as another reason
to start new dmeventd server (when there is no systemd to maintain it).
- returned char not needed to be explicitly const
- warn if pipe() fails in clvmd (more fixes here needed for error paths...)
- assign (and ignore) read() output in drain buffer
Variable 'ret' assigned from _do_event() was actually not used and replaced with next
assignment without any read of the returned value.
Code is reformated - so the error path is put in the if() branch and normal
code is put after the 'if' together with FIXME comment.
FIXME lowprio: logging needs to be fixed in this code,
- multiple log_errors are printed, stacks are missing...
