pgsql: Fsync directory after creating or unlinking file.

Fsync directory after creating or unlinking file.

If file was created/deleted just before powerloss it's possible that
file system will miss that. To prevent it, call fsync() where creating/
unlinkg file is critical.

Author: Michael Paquier
Reviewed-by: Ashutosh Bapat, Takayuki Tsunakawa, me

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/1b02be21f271db6bd3cd43abb23fa596fcb6bac3

Modified Files
--------------
src/backend/access/transam/clog.c      | 14 +++++++++++++
src/backend/access/transam/commit_ts.c | 12 +++++++++++
src/backend/access/transam/twophase.c  |  8 ++++++++
src/backend/access/transam/xlog.c      | 19 ++++++-----------
src/backend/storage/file/fd.c          | 37 ++++++++++++++++++++++++++++++++++
src/include/storage/fd.h               |  1 +
6 files changed, 78 insertions(+), 13 deletions(-)