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This function call is able to setup config parser so it stops
parsing 'subsection' nodes after parsing named section node.
Only nodes at 'level' 0 will be still processed. And this nodes
are found by searching for last \n}\n sequence from the end of
buffer (instead of trying to analyze all the text in buffer).
Use bigger memory pool chunk size and reduces amount of
memory pool extensions when handling larger metadata, but do not
make it noticable bigger when handling small ones...
Use same large value also when allocating VG memory pool.
Instead of allocating string from a pool, for shorted strings
use buffer on stack since the string after the use in _find_or_make_node()
as no longer needed.
Eventually we may enhance code also for TOK_STRING_ESCAPED and TOK_STRING,
but they appear to be unused for _section().
For the most common part check for '#' when it's known it's not a space.
And also when we checked for '\n' we dont need to check again isspace().
Also help a bit more 'gcc' optimizer to grab buffer char just once and
simplify jump to next characted in the buffer when checking for token.
Avoid double dm_pool allocation call by copying string
for node name and config value directly after the end
of node/value structure.
It would be likely better to not copy these strings at all
and derefence it from the original string however that
needs futher changes in the code base.
lvm2 till version 2.02.169 (commit 78d004efa8)
was printing invalid creation_time argument into metadata on 32bit arch.
However with commit ba9820b142 we started
to properly validate all input numbers and thus we refused to accept
invalid metadata with 'garbage' string - but this results in the
situation where metadata produced on older lvm2 on 32 bit architecture
will become unreadable after upgrade.
To fix this case - extend libdm parser in a way, that whenever we
find error integer value, we also check if the parsed value is not for
creation_time node and in this case we let the metadata pass through
with made-up date 2018-05-24 (release date of 2.02.169).
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.
