always true) and accompanying dead code.
- When constructing write clusters in lfs_writeseg, if the block we are
about to add is itself a cluster from GOP_WRITE, don't put a cluster
in a cluster, just write the GOP_WRITE cluster on its own. This seems
to represent a slight performance gain on my test machine.
- Charge someone's rusage for writes on LFSes. It's difficult to tell
who the "right" process to charge is; just charge whoever triggered
the write.
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