Revert "Note MDB_SAFE_FDATASYNC"

This reverts commit 293d6bb47f.

Revert "Simpler fdatasync hack"

This reverts commit 9585c01233.

libraries/liblmdb/Makefile

@@ -11,7 +11,6 @@
 # - MDB_USE_POSIX_SEM
 # - MDB_DSYNC
 # - MDB_FDATASYNC
-# - MDB_SAFE_FDATASYNC
 # - MDB_USE_PWRITEV
 #
 # There may be other macros in mdb.c of interest. You should

libraries/liblmdb/mdb.c

@@ -368,12 +368,6 @@ static int mdb_mutex_failed(MDB_env *env, mdb_mutex_t *mutex, int rc);
  */
 #ifndef MDB_FDATASYNC
 # define MDB_FDATASYNC	fdatasync
-# ifndef MDB_SAFE_FDATASYNC
-/** Linux ext3fs and ext4fs don't implement fdatasync correctly
- *	on older kernels. xfs is known to be safe. https://lkml.org/lkml/2012/9/3/83
- */
-#  define	MDB_BROKEN_FDATASYNC
-# endif
 #endif
 
 #ifndef MDB_MSYNC
@@ -1160,7 +1154,7 @@ struct MDB_env {
 	MDB_txn		*me_txn;		/**< current write transaction */
 	MDB_txn		*me_txn0;		/**< prealloc'd write transaction */
 	size_t		me_mapsize;		/**< size of the data memory map */
-	size_t		me_size;		/**< current file size */
+	off_t		me_size;		/**< current file size */
 	pgno_t		me_maxpg;		/**< me_mapsize / me_psize */
 	MDB_dbx		*me_dbxs;		/**< array of static DB info */
 	uint16_t	*me_dbflags;	/**< array of flags from MDB_db.md_flags */
@@ -2347,10 +2341,6 @@ fail:
 	return rc;
 }
 
-#ifdef MDB_BROKEN_FDATASYNC
-static int ESECT mdb_fsize(HANDLE fd, size_t *size);
-#endif
-
 int
 mdb_env_sync(MDB_env *env, int force)
 {
@@ -2366,15 +2356,6 @@ mdb_env_sync(MDB_env *env, int force)
 				rc = ErrCode();
 #endif
 		} else {
-#ifdef MDB_BROKEN_FDATASYNC
-			size_t sz = 0;
-			if (mdb_fsize(env->me_fd, &sz) != MDB_SUCCESS || sz != env->me_size) {
-				if (fsync(env->me_fd))
-					rc = ErrCode();
-				else if (sz)
-					env->me_size = sz;
-			} else
-#endif
 			if (MDB_FDATASYNC(env->me_fd))
 				rc = ErrCode();
 		}