pg_test_fsync: add C comment about direct I/O and write size failure

Bruce Momjian <bruce@momjian.us>

Commit: f9bb944cd879949cf454b941f2b8fa7b00fcc1e4
Author: Bruce Momjian <bruce@momjian.us>
Date: 2014-02-12T20:38:29Z
Releases: 9.4.0
pg_test_fsync: add C comment about direct I/O and write size failure

Report from Marti Raudsepp

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contrib/pg_test_fsync/pg_test_fsync.c modified +6 −0