From 9430fb407bb64cc842e56fb5844265a9343dafba Mon Sep 17 00:00:00 2001
From: Thomas Munro <tmunro@postgresql.org>
Date: Wed, 20 Jul 2022 13:50:57 +1200
Subject: Add wal_sync_method=fdatasync for Windows.

Windows 10 gained support for flushing NTFS files with fdatasync()
semantics.  The main advantage over open_datasync (in Windows API terms
FILE_FLAG_WRITE_THROUGH) is that the latter does not flush SATA drive
caches.  The default setting is not changed, so users have to opt in to
this.

Discussion: https://postgr.es/m/CA%2BhUKGJZJVO%3DiX%2Beb-PXi2_XS9ZRqnn_4URh0NUQOwt6-_51xQ%40mail.gmail.com
---
 doc/src/sgml/wal.sgml | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'doc/src')

diff --git a/doc/src/sgml/wal.sgml b/doc/src/sgml/wal.sgml
index 4b6ef283c1c..01f7379ebb3 100644
--- a/doc/src/sgml/wal.sgml
+++ b/doc/src/sgml/wal.sgml
@@ -108,7 +108,8 @@
         <literal>open_datasync</literal> (the default), write caching can be disabled
         by unchecking <literal>My Computer\Open\<replaceable>disk drive</replaceable>\Properties\Hardware\Properties\Policies\Enable write caching on the disk</literal>.
         Alternatively, set <varname>wal_sync_method</varname> to
-        <literal>fsync</literal> or <literal>fsync_writethrough</literal>, which prevent
+        <literal>fdatasync</literal> (NTFS only), <literal>fsync</literal> or
+        <literal>fsync_writethrough</literal>, which prevent
         write caching.
       </para>
     </listitem>
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