[InterNetNews/inn] 2583de: ovsqlite: honor mmapsize in the direct reader path

[Kevin Bowling]

  Branch: refs/heads/main
  Home:   https://github.com/InterNetNews/inn
  Commit: 2583def3ad5a778288f93a097e75b1c582d3005f
      https://github.com/InterNetNews/inn/commit/2583def3ad5a778288f93a097e75b1c582d3005f
  Author: Kevin Bowling <kevin.bowling at kev009.com>
  Date:   2026-05-30 (Sat, 30 May 2026)

  Changed paths:
    M doc/pod/ovsqlite.pod
    M samples/ovsqlite.conf
    M storage/ovsqlite/ovsqlite.c

  Log Message:
  -----------
  ovsqlite: honor mmapsize in the direct reader path

The mmapsize parameter was only applied by ovsqlite-server.  When WAL
mode is enabled, nnrpd readers open the database directly via
direct_open(), bypassing the server, so they never set pragma mmap_size.

Read mmapsize in direct_open() and apply it to the read connection,
mirroring the server.  Besides the read-performance benefit, memory-
mapping lets multiple nnrpd readers share the same physical pages through
the OS page cache.  Document the caveat that this helps little on ZFS or
other filesystems without a unified buffer cache, where the mapped pages
would be cached twice.

close #342



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