Revert "Fix prev commit for env_sync0"

This reverts commit e95c9231fc.

Revert "Hack for potential ext3/ext4 corruption issue"

This reverts commit 91155b9d67.

libraries/liblmdb/mdb.c

@@ -333,7 +333,6 @@ mdb_sem_wait(sem_t *sem)
  */
 #ifndef MDB_FDATASYNC
 # define MDB_FDATASYNC	fdatasync
-# define HAVE_FDATASYNC	1
 #endif
 
 #ifndef MDB_MSYNC
@@ -1113,7 +1112,7 @@ 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 */
@@ -2299,19 +2298,10 @@ fail:
 	return rc;
 }
 
-/* internal env_sync flags: */
-#define FORCE	1		/* as before, force a flush */
-#define FGREW	0x8000	/* file has grown, do a full fsync instead of just
-	   fdatasync. We shouldn't have to do this, according to the POSIX spec.
-	   But common Linux FSs violate the spec and won't sync required metadata
-	   correctly when the file grows. This only makes a difference if the
-	   platform actually distinguishes fdatasync from fsync.
-	   http://www.openldap.org/lists/openldap-devel/201411/msg00000.html */
-
-static int
-mdb_env_sync0(MDB_env *env, int flag)
+int
+mdb_env_sync(MDB_env *env, int force)
 {
-	int rc = 0, force = flag & FORCE;
+	int rc = 0;
 	if (force || !F_ISSET(env->me_flags, MDB_NOSYNC)) {
 		if (env->me_flags & MDB_WRITEMAP) {
 			int flags = ((env->me_flags & MDB_MAPASYNC) && !force)
@@ -2323,12 +2313,6 @@ mdb_env_sync0(MDB_env *env, int flag)
 				rc = ErrCode();
 #endif
 		} else {
-#ifdef HAVE_FDATASYNC
-			if (flag & FGREW) {
-				if (fsync(env->me_fd))	/* Avoid ext-fs bugs, do full sync */
-					rc = ErrCode();
-			} else
-#endif
 			if (MDB_FDATASYNC(env->me_fd))
 				rc = ErrCode();
 		}
@@ -2336,12 +2320,6 @@ mdb_env_sync0(MDB_env *env, int flag)
 	return rc;
 }
 
-int
-mdb_env_sync(MDB_env *env, int force)
-{
-	return mdb_env_sync0(env, force != 0);
-}
-
 /** Back up parent txn's cursors, then grab the originals for tracking */
 static int
 mdb_cursor_shadow(MDB_txn *src, MDB_txn *dst)
@@ -3394,15 +3372,8 @@ mdb_txn_commit(MDB_txn *txn)
 	mdb_audit(txn);
 #endif
 
-	i = 0;
-#ifdef HAVE_FDATASYNC
-	if (txn->mt_next_pgno * env->me_psize > env->me_size) {
-		i |= FGREW;
-		env->me_size = txn->mt_next_pgno * env->me_psize;
-	}
-#endif
 	if ((rc = mdb_page_flush(txn, 0)) ||
-		(rc = mdb_env_sync0(env, i)) ||
+		(rc = mdb_env_sync(env, 0)) ||
 		(rc = mdb_env_write_meta(txn)))
 		goto fail;
 
@@ -3926,10 +3897,6 @@ mdb_env_open2(MDB_env *env)
 			env->me_mapsize = minsize;
 	}
 
-	rc = mdb_fsize(env->me_fd, &env->me_size);
-	if (rc)
-		return rc;
-
 	rc = mdb_env_map(env, (flags & MDB_FIXEDMAP) ? meta.mm_address : NULL);
 	if (rc)
 		return rc;