[GENERAL] Where in the source code does postgres write to disk?

According to http://www.postgresql.org/docs/9.2/static/storage-file-layout.html "When a table or index exceeds 1 GB, it is divided into gigabyte-sized segments. The first segment's file name is the same as the filenode; subsequent segments are named filenode.1, filenode.2, etc." I was wondering w

[GENERAL] Where in the source code does postgres write to disk?

According to http://www.postgresql.org/docs/9.2/static/storage-file-layout.html "When a table or index exceeds 1 GB, it is divided into gigabyte-sized segments. The first segment's file name is the same as the filenode; subsequent segments are named filenode.1, filenode.2, etc." I was wondering w