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18724af9e8
This became safe after commit 4b4798e138. The smgrcreate() call will
now register the segment for syncing at the next checkpoint, so we
don't need to sync it here. If a checkpoint happens before the
creation is WAL-logged, the records will be replayed when starting
recovery from the checkpoint. If a checkpoint happens after the WAL
logging, the checkpoint will fsync() it.
In the passing, clarify a comment in smgrDoPendingSyncs().
Discussion: https://www.postgresql.org/message-id/6e5bbc08-cdfc-b2b3-9e23-1a914b9850a9%40iki.fi
Reviewed-by: Robert Haas