MDEV-4398 -

Change default for innodb_use_fallocate to FALSE, due to bugs in older Linux kernels (posix_fallocate() does not always guarantee that file size is like one specified)

mysql-test/suite/sys_vars/r/innodb_use_fallocate_basic.result

 select @@global.innodb_use_fallocate;
 @@global.innodb_use_fallocate
-1
+0
 select @@session.innodb_use_fallocate;
 ERROR HY000: Variable 'innodb_use_fallocate' is a GLOBAL variable
 show global variables like 'innodb_use_fallocate';
 Variable_name	Value
-innodb_use_fallocate	ON
+innodb_use_fallocate	OFF
 show session variables like 'innodb_use_fallocate';
 Variable_name	Value
-innodb_use_fallocate	ON
+innodb_use_fallocate	OFF
 select * from information_schema.global_variables where variable_name='innodb_use_fallocate';
 VARIABLE_NAME	VARIABLE_VALUE
-INNODB_USE_FALLOCATE	ON
+INNODB_USE_FALLOCATE	OFF
 select * from information_schema.session_variables where variable_name='innodb_use_fallocate';
 VARIABLE_NAME	VARIABLE_VALUE
-INNODB_USE_FALLOCATE	ON
+INNODB_USE_FALLOCATE	OFF
 set global innodb_use_fallocate=1;
 ERROR HY000: Variable 'innodb_use_fallocate' is a read only variable
 set session innodb_use_fallocate=1;

storage/innobase/handler/ha_innodb.cc

@@ -11420,7 +11420,7 @@ static MYSQL_SYSVAR_BOOL(use_atomic_writes, innobase_use_atomic_writes,
 static MYSQL_SYSVAR_BOOL(use_fallocate, innobase_use_fallocate,
   PLUGIN_VAR_NOCMDARG | PLUGIN_VAR_READONLY,
   "Preallocate files fast, using operating system functionality. On POSIX systems, posix_fallocate system call is used.",
-  NULL, NULL, TRUE);
+  NULL, NULL, FALSE);
 
 static MYSQL_SYSVAR_ULONG(io_capacity, srv_io_capacity,
   PLUGIN_VAR_RQCMDARG,

storage/xtradb/handler/ha_innodb.cc

@@ -12661,7 +12661,7 @@ static MYSQL_SYSVAR_BOOL(use_atomic_writes, innobase_use_atomic_writes,
 static MYSQL_SYSVAR_BOOL(use_fallocate, innobase_use_fallocate,
   PLUGIN_VAR_NOCMDARG | PLUGIN_VAR_READONLY,
   "Preallocate files fast, using operating system functionality. On POSIX systems, posix_fallocate system call is used.",
-  NULL, NULL, TRUE);
+  NULL, NULL, FALSE);
 
 static MYSQL_SYSVAR_ULONG(io_capacity, srv_io_capacity,
   PLUGIN_VAR_RQCMDARG,