InnoDB: Backport innodb_autoextend_increment from 4.1

innobase/include/srv0srv.h:
  Add configuration variable srv_auto_extend_increment
innobase/srv/srv0srv.c:
  Add configuration variable srv_auto_extend_increment
sql/ha_innodb.h:
  Add configuration variable srv_auto_extend_increment
sql/mysqld.cc:
  Add startup option innodb_autoextend_increment
sql/set_var.cc:
  Add settable global variable innodb_autoextend_increment

innobase/include/srv0srv.h

@@ -27,7 +27,8 @@ extern os_event_t	srv_lock_timeout_thread_event;
 
 /* If the last data file is auto-extended, we add this many pages to it
 at a time */
-#define SRV_AUTO_EXTEND_INCREMENT   (8 * ((1024 * 1024) / UNIV_PAGE_SIZE))
+#define SRV_AUTO_EXTEND_INCREMENT	\
+	(srv_auto_extend_increment * ((1024 * 1024) / UNIV_PAGE_SIZE))
 
 /* This is set to TRUE if the MySQL user has set it in MySQL */
 extern ibool	srv_lower_case_table_names;
@@ -49,6 +50,7 @@ extern ulint*   srv_data_file_is_raw_partition;
 
 extern ibool	srv_auto_extend_last_data_file;
 extern ulint	srv_last_file_size_max;
+extern ulint	srv_auto_extend_increment;
 
 extern ibool	srv_created_new_raw;
 

innobase/srv/srv0srv.c

@@ -86,6 +86,9 @@ ulint	srv_last_file_size_max	= 0;		 /* if != 0, this tells
 						 the max size auto-extending
 						 may increase the last data
 						 file size */
+ulint	srv_auto_extend_increment = 8;		 /* If the last data file is
+						 auto-extended, we add this
+						 many pages to it at a time */
 ulint*  srv_data_file_is_raw_partition = NULL;
 
 /* If the following is TRUE we do not allow inserts etc. This protects

sql/ha_innodb.h

@@ -208,6 +208,7 @@ extern my_bool innobase_log_archive,
 extern "C" {
 extern ulong srv_max_buf_pool_modified_pct;
 extern ulong srv_max_purge_lag;
+extern ulong srv_auto_extend_increment;
 }
 
 extern TYPELIB innobase_lock_typelib;

sql/mysqld.cc

@@ -3518,6 +3518,7 @@ enum options_mysqld {
   OPT_INNODB_FORCE_RECOVERY,
   OPT_INNODB_STATUS_FILE,
   OPT_INNODB_MAX_DIRTY_PAGES_PCT,
+  OPT_INNODB_AUTOEXTEND_INCREMENT,
   OPT_INNODB_TABLE_LOCKS,
   OPT_BDB_CACHE_SIZE,
   OPT_BDB_LOG_BUFFER_SIZE,
@@ -3659,6 +3660,11 @@ struct my_option my_long_options[] =
    "Path to individual files and their sizes",
    0, 0, 0, GET_STR, REQUIRED_ARG, 0, 0, 0, 0, 0, 0},
 #ifdef HAVE_INNOBASE_DB
+  {"innodb_autoextend_increment", OPT_INNODB_AUTOEXTEND_INCREMENT,
+   "Data file autoextend increment in megabytes",
+   (gptr*) &srv_auto_extend_increment,
+   (gptr*) &srv_auto_extend_increment,
+   0, GET_LONG, REQUIRED_ARG, 8L, 1L, 1000L, 0, 1L, 0},
   {"innodb_data_home_dir", OPT_INNODB_DATA_HOME_DIR,
    "The common part for Innodb table spaces", (gptr*) &innobase_data_home_dir,
    (gptr*) &innobase_data_home_dir, 0, GET_STR, REQUIRED_ARG, 0, 0, 0, 0, 0,

sql/set_var.cc

@@ -265,6 +265,8 @@ sys_var_long_ptr        sys_innodb_max_dirty_pages_pct("innodb_max_dirty_pages_p
                                                         &srv_max_buf_pool_modified_pct);
 sys_var_long_ptr	sys_innodb_max_purge_lag("innodb_max_purge_lag",
 							&srv_max_purge_lag);
+sys_var_long_ptr	sys_innodb_autoextend_increment("innodb_autoextend_increment",
+							&srv_auto_extend_increment);
 sys_var_thd_bool	sys_innodb_table_locks("innodb_table_locks",
                                                &SV::innodb_table_locks);
 #endif 					     
@@ -454,6 +456,7 @@ sys_var *sys_variables[]=
 #ifdef HAVE_INNOBASE_DB
   &sys_innodb_max_dirty_pages_pct,
   &sys_innodb_max_purge_lag,
+  &sys_innodb_autoextend_increment,
   &sys_innodb_table_locks,
 #endif    
   &sys_unique_checks
@@ -508,6 +511,7 @@ struct show_var_st init_vars[]= {
   {"init_file",               (char*) &opt_init_file,               SHOW_CHAR_PTR},
 #ifdef HAVE_INNOBASE_DB
   {"innodb_additional_mem_pool_size", (char*) &innobase_additional_mem_pool_size, SHOW_LONG },
+  {sys_innodb_autoextend_increment.name, (char*) &sys_innodb_autoextend_increment, SHOW_SYS},
   {"innodb_buffer_pool_size", (char*) &innobase_buffer_pool_size, SHOW_LONG },
   {"innodb_data_file_path", (char*) &innobase_data_file_path,	    SHOW_CHAR_PTR},
   {"innodb_data_home_dir",  (char*) &innobase_data_home_dir,	    SHOW_CHAR_PTR},