Tom Lane 44dfc9cd71 Force default wal_sync_method to be fdatasync on Linux. ... Recent versions of the Linux system header files cause xlogdefs.h to believe that open_datasync should be the default sync method, whereas formerly fdatasync was the default on Linux. open_datasync is a bad choice, first because it doesn't actually outperform fdatasync (in fact the reverse), and second because we try to use O_DIRECT with it, causing failures on certain filesystems (e.g., ext4 with data=journal option). This part of the patch is largely per a proposal from Marti Raudsepp. More extensive changes are likely to follow in HEAD, but this is as much change as we want to back-patch. Also clean up confusing code and incorrect documentation surrounding the fsync_writethrough option. Those changes shouldn't result in any actual behavioral change, but I chose to back-patch them anyway to keep the branches looking similar in this area. In 9.0 and HEAD, also do some copy-editing on the WAL Reliability documentation section. Back-patch to all supported branches, since any of them might get used on modern Linux versions.		2010-12-08 20:01:24 -05:00
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win32	pgindent run for 8.2.	2006-10-04 00:30:14 +00:00
win32_msvc	pgindent run for 8.2.	2006-10-04 00:30:14 +00:00
aix.h	Now that core functionality is depending on autoconf's AC_C_BIGENDIAN to be	2007-04-06 05:36:51 +00:00
bsdi.h	Pgindent run for 8.0.	2004-08-29 05:07:03 +00:00
cygwin.h	Rename DLLIMPORT macro to PGDLLIMPORT to avoid conflict with	2007-07-25 12:22:54 +00:00
darwin.h	pgindent run for 8.2.	2006-10-04 00:30:14 +00:00
dgux.h	Now that core functionality is depending on autoconf's AC_C_BIGENDIAN to be	2007-04-06 05:36:51 +00:00
freebsd.h	Add CVS tag lines to files that were lacking them.	2006-03-11 04:38:42 +00:00
hpux.h	Now that core functionality is depending on autoconf's AC_C_BIGENDIAN to be	2007-04-06 05:36:51 +00:00
irix.h	Work around buggy strtod on (some versions of?) IRIX. Combination of	2006-10-05 01:40:45 +00:00
linux.h	Force default wal_sync_method to be fdatasync on Linux.	2010-12-08 20:01:24 -05:00
netbsd.h	pgindent run for 8.2.	2006-10-04 00:30:14 +00:00
nextstep.h	Add CVS tag lines to files that were lacking them.	2006-03-11 04:38:42 +00:00
openbsd.h	Add CVS tag lines to files that were lacking them.	2006-03-11 04:38:42 +00:00
osf.h	Add CVS tag lines to files that were lacking them.	2006-03-11 04:38:42 +00:00
sco.h	Now that core functionality is depending on autoconf's AC_C_BIGENDIAN to be	2007-04-06 05:36:51 +00:00
solaris.h	pgindent run for 8.3.	2007-11-15 21:14:46 +00:00
sunos4.h	Now that core functionality is depending on autoconf's AC_C_BIGENDIAN to be	2007-04-06 05:36:51 +00:00
svr4.h	Now that core functionality is depending on autoconf's AC_C_BIGENDIAN to be	2007-04-06 05:36:51 +00:00
ultrix4.h	Now that core functionality is depending on autoconf's AC_C_BIGENDIAN to be	2007-04-06 05:36:51 +00:00
univel.h	Now that core functionality is depending on autoconf's AC_C_BIGENDIAN to be	2007-04-06 05:36:51 +00:00
unixware.h	Now that core functionality is depending on autoconf's AC_C_BIGENDIAN to be	2007-04-06 05:36:51 +00:00
win32.h	Force default wal_sync_method to be fdatasync on Linux.	2010-12-08 20:01:24 -05:00