diff --git a/storage/innodb_plugin/dict/dict0dict.c b/storage/innodb_plugin/dict/dict0dict.c index 61f70c72720..8be5b7acac5 100644 --- a/storage/innodb_plugin/dict/dict0dict.c +++ b/storage/innodb_plugin/dict/dict0dict.c @@ -850,7 +850,8 @@ dict_table_add_to_cache( /* Add table to LRU list of tables */ UT_LIST_ADD_FIRST(table_LRU, dict_sys->table_LRU, table); - dict_sys->size += mem_heap_get_size(table->heap); + dict_sys->size += mem_heap_get_size(table->heap) + + strlen(table->name) + 1; } /**********************************************************************//** @@ -904,14 +905,21 @@ dict_table_rename_in_cache( dict_foreign_t* foreign; dict_index_t* index; ulint fold; - ulint old_size; - const char* old_name; + char old_name[MAX_TABLE_NAME_LEN + 1]; ut_ad(table); ut_ad(mutex_own(&(dict_sys->mutex))); - old_size = mem_heap_get_size(table->heap); - old_name = table->name; + /* store the old/current name to an automatic variable */ + if (strlen(table->name) + 1 <= sizeof(old_name)) { + memcpy(old_name, table->name, strlen(table->name) + 1); + } else { + ut_print_timestamp(stderr); + fprintf(stderr, "InnoDB: too long table name: '%s', " + "max length is %d\n", table->name, + MAX_TABLE_NAME_LEN); + ut_error; + } fold = ut_fold_string(new_name); @@ -957,12 +965,22 @@ dict_table_rename_in_cache( /* Remove table from the hash tables of tables */ HASH_DELETE(dict_table_t, name_hash, dict_sys->table_hash, ut_fold_string(old_name), table); - table->name = mem_heap_strdup(table->heap, new_name); + + if (strlen(new_name) > strlen(table->name)) { + /* We allocate MAX_TABLE_NAME_LEN+1 bytes here to avoid + memory fragmentation, we assume a repeated calls of + ut_realloc() with the same size do not cause fragmentation */ + ut_a(strlen(new_name) <= MAX_TABLE_NAME_LEN); + table->name = ut_realloc(table->name, MAX_TABLE_NAME_LEN + 1); + } + memcpy(table->name, new_name, strlen(new_name) + 1); /* Add table to hash table of tables */ HASH_INSERT(dict_table_t, name_hash, dict_sys->table_hash, fold, table); - dict_sys->size += (mem_heap_get_size(table->heap) - old_size); + + dict_sys->size += strlen(new_name) - strlen(old_name); + ut_a(dict_sys->size > 0); /* Update the table_name field in indexes */ index = dict_table_get_first_index(table); @@ -1187,7 +1205,7 @@ dict_table_remove_from_cache( /* Remove table from LRU list of tables */ UT_LIST_REMOVE(table_LRU, dict_sys->table_LRU, table); - size = mem_heap_get_size(table->heap); + size = mem_heap_get_size(table->heap) + strlen(table->name) + 1; ut_ad(dict_sys->size >= size); diff --git a/storage/innodb_plugin/dict/dict0mem.c b/storage/innodb_plugin/dict/dict0mem.c index 66b4b43f296..3287247029f 100644 --- a/storage/innodb_plugin/dict/dict0mem.c +++ b/storage/innodb_plugin/dict/dict0mem.c @@ -68,7 +68,8 @@ dict_mem_table_create( table->heap = heap; table->flags = (unsigned int) flags; - table->name = mem_heap_strdup(heap, name); + table->name = ut_malloc(strlen(name) + 1); + memcpy(table->name, name, strlen(name) + 1); table->space = (unsigned int) space; table->n_cols = (unsigned int) (n_cols + DATA_N_SYS_COLS); @@ -106,6 +107,7 @@ dict_mem_table_free( #ifndef UNIV_HOTBACKUP mutex_free(&(table->autoinc_mutex)); #endif /* UNIV_HOTBACKUP */ + ut_free(table->name); mem_heap_free(table->heap); } diff --git a/storage/innodb_plugin/include/dict0mem.h b/storage/innodb_plugin/include/dict0mem.h index 9996fb59a75..2fce1e00927 100644 --- a/storage/innodb_plugin/include/dict0mem.h +++ b/storage/innodb_plugin/include/dict0mem.h @@ -382,7 +382,7 @@ initialized to 0, NULL or FALSE in dict_mem_table_create(). */ struct dict_table_struct{ dulint id; /*!< id of the table */ mem_heap_t* heap; /*!< memory heap */ - const char* name; /*!< table name */ + char* name; /*!< table name */ const char* dir_path_of_temp_table;/*!< NULL or the directory path where a TEMPORARY table that was explicitly created by a user should be placed if diff --git a/storage/innodb_plugin/include/univ.i b/storage/innodb_plugin/include/univ.i index 9da08c894cd..b8e595161b9 100644 --- a/storage/innodb_plugin/include/univ.i +++ b/storage/innodb_plugin/include/univ.i @@ -290,6 +290,12 @@ management to ensure correct alignment for doubles etc. */ /* Maximum number of parallel threads in a parallelized operation */ #define UNIV_MAX_PARALLELISM 32 +/* The maximum length of a table name. This is the MySQL limit and is +defined in mysql_com.h like NAME_CHAR_LEN*SYSTEM_CHARSET_MBMAXLEN, the +number does not include a terminating '\0'. InnoDB probably can handle +longer names internally */ +#define MAX_TABLE_NAME_LEN 192 + /* UNIVERSAL TYPE DEFINITIONS ========================== diff --git a/storage/innodb_plugin/page/page0zip.c b/storage/innodb_plugin/page/page0zip.c index 8d9632a3548..d3b1edefc6b 100644 --- a/storage/innodb_plugin/page/page0zip.c +++ b/storage/innodb_plugin/page/page0zip.c @@ -1464,6 +1464,7 @@ page_zip_fields_free( dict_table_t* table = index->table; mem_heap_free(index->heap); mutex_free(&(table->autoinc_mutex)); + ut_free(table->name); mem_heap_free(table->heap); } } diff --git a/storage/innodb_plugin/row/row0merge.c b/storage/innodb_plugin/row/row0merge.c index 28e7faed1f8..70cc7912fad 100644 --- a/storage/innodb_plugin/row/row0merge.c +++ b/storage/innodb_plugin/row/row0merge.c @@ -2336,7 +2336,7 @@ row_merge_rename_tables( { ulint err = DB_ERROR; pars_info_t* info; - const char* old_name= old_table->name; + char old_name[MAX_TABLE_NAME_LEN + 1]; ut_ad(trx->mysql_thread_id == os_thread_get_curr_id()); ut_ad(old_table != new_table); @@ -2344,6 +2344,17 @@ row_merge_rename_tables( ut_a(trx->dict_operation_lock_mode == RW_X_LATCH); + /* store the old/current name to an automatic variable */ + if (strlen(old_table->name) + 1 <= sizeof(old_name)) { + memcpy(old_name, old_table->name, strlen(old_table->name) + 1); + } else { + ut_print_timestamp(stderr); + fprintf(stderr, "InnoDB: too long table name: '%s', " + "max length is %d\n", old_table->name, + MAX_TABLE_NAME_LEN); + ut_error; + } + trx->op_info = "renaming tables"; /* We use the private SQL parser of Innobase to generate the query