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This is a follow-up for 1d8d483f59 and
makes the strict ordering by realtime clock within each journal file
optional, not mandatory. It then enables it for all journal files
written by journald, but leaves it off on others (for example those
written by journald-remote).
This relaxes the logic behind writing journal files to the status quo
ante for all cases where the journal files are not generated, but are
merged/processed/propagated. Typically when processing journal records
from many files ordering by realtime clock and monotonic clock are
contradictory, and cannot be universally guaranteed as the records are
interleaved. By enforcing strict rules we would thus end up generating
myriads of separate journal files, each with just a few records in them.
Hence, let's losen restrictions again, but continue to enforce them in
journald, i.e. when we original create the journal files locally.
Note that generally there's nothing really wring with having journal
files with non-monotonically ordered entries by realtime clock. Looking
for records will not be deterministic anymore, but that's inherent to a
realtime clock that jumps up and down. So you won't get the "only"
answer, but still *a* answer that is correct if you seek for a realtime
clock.
This also adds similar logic on the monotonic clock, which is also only
enabled when generating journal files locally. This should be harder to
trigger (as journald will generate the messages, and should run with a
stable boot id and monotonic clock), but let's better be safe than
sorry, and refuse on the lower layer what makes no sense, even if it's
unlikely the higher layer will ever generate records that aren't ordered
by their monotonic clock.
ce92dc27a1
