/***************************************************************************** Copyright (c) 1996, 2010, Innobase Oy. All Rights Reserved. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; version 2 of the License. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA *****************************************************************************/ /**************************************************//** @file dict/dict0load.c Loads to the memory cache database object definitions from dictionary tables Created 4/24/1996 Heikki Tuuri *******************************************************/ #include "dict0load.h" #include "mysql_version.h" #ifdef UNIV_NONINL #include "dict0load.ic" #endif #include "btr0pcur.h" #include "btr0btr.h" #include "page0page.h" #include "mach0data.h" #include "dict0dict.h" #include "dict0boot.h" #include "rem0cmp.h" #include "srv0start.h" #include "srv0srv.h" /** Following are six InnoDB system tables */ static const char* SYSTEM_TABLE_NAME[] = { "SYS_TABLES", "SYS_INDEXES", "SYS_COLUMNS", "SYS_FIELDS", "SYS_FOREIGN", "SYS_FOREIGN_COLS" }; /****************************************************************//** Compare the name of an index column. @return TRUE if the i'th column of index is 'name'. */ static ibool name_of_col_is( /*===========*/ const dict_table_t* table, /*!< in: table */ const dict_index_t* index, /*!< in: index */ ulint i, /*!< in: index field offset */ const char* name) /*!< in: name to compare to */ { ulint tmp = dict_col_get_no(dict_field_get_col( dict_index_get_nth_field( index, i))); return(strcmp(name, dict_table_get_col_name(table, tmp)) == 0); } /********************************************************************//** Finds the first table name in the given database. @return own: table name, NULL if does not exist; the caller must free the memory in the string! */ UNIV_INTERN char* dict_get_first_table_name_in_db( /*============================*/ const char* name) /*!< in: database name which ends in '/' */ { dict_table_t* sys_tables; btr_pcur_t pcur; dict_index_t* sys_index; dtuple_t* tuple; mem_heap_t* heap; dfield_t* dfield; const rec_t* rec; const byte* field; ulint len; mtr_t mtr; ut_ad(mutex_own(&(dict_sys->mutex))); heap = mem_heap_create(1000); mtr_start(&mtr); sys_tables = dict_table_get_low("SYS_TABLES"); sys_index = UT_LIST_GET_FIRST(sys_tables->indexes); ut_a(!dict_table_is_comp(sys_tables)); tuple = dtuple_create(heap, 1); dfield = dtuple_get_nth_field(tuple, 0); dfield_set_data(dfield, name, ut_strlen(name)); dict_index_copy_types(tuple, sys_index, 1); btr_pcur_open_on_user_rec(sys_index, tuple, PAGE_CUR_GE, BTR_SEARCH_LEAF, &pcur, &mtr); loop: rec = btr_pcur_get_rec(&pcur); if (!btr_pcur_is_on_user_rec(&pcur)) { /* Not found */ btr_pcur_close(&pcur); mtr_commit(&mtr); mem_heap_free(heap); return(NULL); } field = rec_get_nth_field_old(rec, 0, &len); if (len < strlen(name) || ut_memcmp(name, field, strlen(name)) != 0) { /* Not found */ btr_pcur_close(&pcur); mtr_commit(&mtr); mem_heap_free(heap); return(NULL); } if (!rec_get_deleted_flag(rec, 0)) { /* We found one */ char* table_name = mem_strdupl((char*) field, len); btr_pcur_close(&pcur); mtr_commit(&mtr); mem_heap_free(heap); return(table_name); } btr_pcur_move_to_next_user_rec(&pcur, &mtr); goto loop; } /********************************************************************//** Prints to the standard output information on all tables found in the data dictionary system table. */ UNIV_INTERN void dict_print(void) /*============*/ { dict_table_t* table; btr_pcur_t pcur; const rec_t* rec; mem_heap_t* heap; mtr_t mtr; /* Enlarge the fatal semaphore wait timeout during the InnoDB table monitor printout */ mutex_enter(&kernel_mutex); srv_fatal_semaphore_wait_threshold += 7200; /* 2 hours */ mutex_exit(&kernel_mutex); heap = mem_heap_create(1000); mutex_enter(&(dict_sys->mutex)); mtr_start(&mtr); rec = dict_startscan_system(&pcur, &mtr, SYS_TABLES); while (rec) { const char* err_msg; err_msg = dict_process_sys_tables_rec( heap, rec, &table, DICT_TABLE_LOAD_FROM_CACHE | DICT_TABLE_UPDATE_STATS); mtr_commit(&mtr); if (!err_msg) { dict_table_print_low(table); } else { ut_print_timestamp(stderr); fprintf(stderr, " InnoDB: %s\n", err_msg); } mem_heap_empty(heap); mtr_start(&mtr); rec = dict_getnext_system(&pcur, &mtr); } mtr_commit(&mtr); mutex_exit(&(dict_sys->mutex)); mem_heap_free(heap); /* Restore the fatal semaphore wait timeout */ mutex_enter(&kernel_mutex); srv_fatal_semaphore_wait_threshold -= 7200; /* 2 hours */ mutex_exit(&kernel_mutex); } /********************************************************************//** This function gets the next system table record as it scans the table. @return the next record if found, NULL if end of scan */ static const rec_t* dict_getnext_system_low( /*====================*/ btr_pcur_t* pcur, /*!< in/out: persistent cursor to the record*/ mtr_t* mtr) /*!< in: the mini-transaction */ { rec_t* rec = NULL; while (!rec || rec_get_deleted_flag(rec, 0)) { btr_pcur_move_to_next_user_rec(pcur, mtr); rec = btr_pcur_get_rec(pcur); if (!btr_pcur_is_on_user_rec(pcur)) { /* end of index */ btr_pcur_close(pcur); return(NULL); } } /* Get a record, let's save the position */ btr_pcur_store_position(pcur, mtr); return(rec); } /********************************************************************//** This function opens a system table, and return the first record. @return first record of the system table */ UNIV_INTERN const rec_t* dict_startscan_system( /*==================*/ btr_pcur_t* pcur, /*!< out: persistent cursor to the record */ mtr_t* mtr, /*!< in: the mini-transaction */ dict_system_id_t system_id) /*!< in: which system table to open */ { dict_table_t* system_table; dict_index_t* clust_index; const rec_t* rec; ut_a(system_id < SYS_NUM_SYSTEM_TABLES); system_table = dict_table_get_low(SYSTEM_TABLE_NAME[system_id]); clust_index = UT_LIST_GET_FIRST(system_table->indexes); btr_pcur_open_at_index_side(TRUE, clust_index, BTR_SEARCH_LEAF, pcur, TRUE, mtr); rec = dict_getnext_system_low(pcur, mtr); return(rec); } /********************************************************************//** This function gets the next system table record as it scans the table. @return the next record if found, NULL if end of scan */ UNIV_INTERN const rec_t* dict_getnext_system( /*================*/ btr_pcur_t* pcur, /*!< in/out: persistent cursor to the record */ mtr_t* mtr) /*!< in: the mini-transaction */ { const rec_t* rec; /* Restore the position */ btr_pcur_restore_position(BTR_SEARCH_LEAF, pcur, mtr); /* Get the next record */ rec = dict_getnext_system_low(pcur, mtr); return(rec); } /********************************************************************//** This function processes one SYS_TABLES record and populate the dict_table_t struct for the table. Extracted out of dict_print() to be used by both monitor table output and information schema innodb_sys_tables output. @return error message, or NULL on success */ UNIV_INTERN const char* dict_process_sys_tables_rec( /*========================*/ mem_heap_t* heap, /*!< in/out: temporary memory heap */ const rec_t* rec, /*!< in: SYS_TABLES record */ dict_table_t** table, /*!< out: dict_table_t to fill */ dict_table_info_t status) /*!< in: status bit controls options such as whether we shall look for dict_table_t from cache first */ { ulint len; const char* field; const char* err_msg = NULL; char* table_name; field = (const char*) rec_get_nth_field_old(rec, 0, &len); ut_a(!rec_get_deleted_flag(rec, 0)); /* Get the table name */ table_name = mem_heap_strdupl(heap, field, len); /* If DICT_TABLE_LOAD_FROM_CACHE is set, first check whether there is cached dict_table_t struct first */ if (status & DICT_TABLE_LOAD_FROM_CACHE) { *table = dict_table_get_low(table_name); if (!(*table)) { err_msg = "Table not found in cache"; } } else { err_msg = dict_load_table_low(table_name, rec, table); } if (err_msg) { return(err_msg); } if ((status & DICT_TABLE_UPDATE_STATS) && dict_table_get_first_index(*table)) { /* Update statistics if DICT_TABLE_UPDATE_STATS is set */ dict_update_statistics_low(*table, TRUE); } return(NULL); } /********************************************************************//** This function parses a SYS_INDEXES record and populate a dict_index_t structure with the information from the record. For detail information about SYS_INDEXES fields, please refer to dict_boot() function. @return error message, or NULL on success */ UNIV_INTERN const char* dict_process_sys_indexes_rec( /*=========================*/ mem_heap_t* heap, /*!< in/out: heap memory */ const rec_t* rec, /*!< in: current SYS_INDEXES rec */ dict_index_t* index, /*!< out: index to be filled */ table_id_t* table_id) /*!< out: index table id */ { const char* err_msg; byte* buf; buf = mem_heap_alloc(heap, 8); /* Parse the record, and get "dict_index_t" struct filled */ err_msg = dict_load_index_low(buf, NULL, heap, rec, FALSE, &index); *table_id = mach_read_from_8(buf); return(err_msg); } /********************************************************************//** This function parses a SYS_COLUMNS record and populate a dict_column_t structure with the information from the record. @return error message, or NULL on success */ UNIV_INTERN const char* dict_process_sys_columns_rec( /*=========================*/ mem_heap_t* heap, /*!< in/out: heap memory */ const rec_t* rec, /*!< in: current SYS_COLUMNS rec */ dict_col_t* column, /*!< out: dict_col_t to be filled */ table_id_t* table_id, /*!< out: table id */ const char** col_name) /*!< out: column name */ { const char* err_msg; /* Parse the record, and get "dict_col_t" struct filled */ err_msg = dict_load_column_low(NULL, heap, column, table_id, col_name, rec); return(err_msg); } /********************************************************************//** This function parses a SYS_FIELDS record and populates a dict_field_t structure with the information from the record. @return error message, or NULL on success */ UNIV_INTERN const char* dict_process_sys_fields_rec( /*========================*/ mem_heap_t* heap, /*!< in/out: heap memory */ const rec_t* rec, /*!< in: current SYS_FIELDS rec */ dict_field_t* sys_field, /*!< out: dict_field_t to be filled */ ulint* pos, /*!< out: Field position */ index_id_t* index_id, /*!< out: current index id */ index_id_t last_id) /*!< in: previous index id */ { byte* buf; byte* last_index_id; const char* err_msg; buf = mem_heap_alloc(heap, 8); last_index_id = mem_heap_alloc(heap, 8); mach_write_to_8(last_index_id, last_id); err_msg = dict_load_field_low(buf, NULL, sys_field, pos, last_index_id, heap, rec); *index_id = mach_read_from_8(buf); return(err_msg); } /********************************************************************//** This function parses a SYS_FOREIGN record and populate a dict_foreign_t structure with the information from the record. For detail information about SYS_FOREIGN fields, please refer to dict_load_foreign() function @return error message, or NULL on success */ UNIV_INTERN const char* dict_process_sys_foreign_rec( /*=========================*/ mem_heap_t* heap, /*!< in/out: heap memory */ const rec_t* rec, /*!< in: current SYS_FOREIGN rec */ dict_foreign_t* foreign) /*!< out: dict_foreign_t struct to be filled */ { ulint len; const byte* field; ulint n_fields_and_type; if (UNIV_UNLIKELY(rec_get_deleted_flag(rec, 0))) { return("delete-marked record in SYS_FOREIGN"); } if (UNIV_UNLIKELY(rec_get_n_fields_old(rec) != 6)) { return("wrong number of columns in SYS_FOREIGN record"); } field = rec_get_nth_field_old(rec, 0/*ID*/, &len); if (UNIV_UNLIKELY(len < 1 || len == UNIV_SQL_NULL)) { err_len: return("incorrect column length in SYS_FOREIGN"); } foreign->id = mem_heap_strdupl(heap, (const char*) field, len); rec_get_nth_field_offs_old(rec, 1/*DB_TRX_ID*/, &len); if (UNIV_UNLIKELY(len != DATA_TRX_ID_LEN && len != UNIV_SQL_NULL)) { goto err_len; } rec_get_nth_field_offs_old(rec, 2/*DB_ROLL_PTR*/, &len); if (UNIV_UNLIKELY(len != DATA_ROLL_PTR_LEN && len != UNIV_SQL_NULL)) { goto err_len; } field = rec_get_nth_field_old(rec, 3/*FOR_NAME*/, &len); if (UNIV_UNLIKELY(len < 1 || len == UNIV_SQL_NULL)) { goto err_len; } foreign->foreign_table_name = mem_heap_strdupl( heap, (const char*) field, len); field = rec_get_nth_field_old(rec, 4/*REF_NAME*/, &len); if (UNIV_UNLIKELY(len < 1 || len == UNIV_SQL_NULL)) { goto err_len; } foreign->referenced_table_name = mem_heap_strdupl( heap, (const char*) field, len); field = rec_get_nth_field_old(rec, 5/*N_COLS*/, &len); if (UNIV_UNLIKELY(len != 4)) { goto err_len; } n_fields_and_type = mach_read_from_4(field); foreign->type = (unsigned int) (n_fields_and_type >> 24); foreign->n_fields = (unsigned int) (n_fields_and_type & 0x3FFUL); return(NULL); } /********************************************************************//** This function parses a SYS_FOREIGN_COLS record and extract necessary information from the record and return to caller. @return error message, or NULL on success */ UNIV_INTERN const char* dict_process_sys_foreign_col_rec( /*=============================*/ mem_heap_t* heap, /*!< in/out: heap memory */ const rec_t* rec, /*!< in: current SYS_FOREIGN_COLS rec */ const char** name, /*!< out: foreign key constraint name */ const char** for_col_name, /*!< out: referencing column name */ const char** ref_col_name, /*!< out: referenced column name in referenced table */ ulint* pos) /*!< out: column position */ { ulint len; const byte* field; if (UNIV_UNLIKELY(rec_get_deleted_flag(rec, 0))) { return("delete-marked record in SYS_FOREIGN_COLS"); } if (UNIV_UNLIKELY(rec_get_n_fields_old(rec) != 6)) { return("wrong number of columns in SYS_FOREIGN_COLS record"); } field = rec_get_nth_field_old(rec, 0/*ID*/, &len); if (UNIV_UNLIKELY(len < 1 || len == UNIV_SQL_NULL)) { err_len: return("incorrect column length in SYS_FOREIGN_COLS"); } *name = mem_heap_strdupl(heap, (char*) field, len); field = rec_get_nth_field_old(rec, 1/*POS*/, &len); if (UNIV_UNLIKELY(len != 4)) { goto err_len; } *pos = mach_read_from_4(field); rec_get_nth_field_offs_old(rec, 2/*DB_TRX_ID*/, &len); if (UNIV_UNLIKELY(len != DATA_TRX_ID_LEN && len != UNIV_SQL_NULL)) { goto err_len; } rec_get_nth_field_offs_old(rec, 3/*DB_ROLL_PTR*/, &len); if (UNIV_UNLIKELY(len != DATA_ROLL_PTR_LEN && len != UNIV_SQL_NULL)) { goto err_len; } field = rec_get_nth_field_old(rec, 4/*FOR_COL_NAME*/, &len); if (UNIV_UNLIKELY(len < 1 || len == UNIV_SQL_NULL)) { goto err_len; } *for_col_name = mem_heap_strdupl(heap, (char*) field, len); field = rec_get_nth_field_old(rec, 5/*REF_COL_NAME*/, &len); if (UNIV_UNLIKELY(len < 1 || len == UNIV_SQL_NULL)) { goto err_len; } *ref_col_name = mem_heap_strdupl(heap, (char*) field, len); return(NULL); } /********************************************************************//** Determine the flags of a table described in SYS_TABLES. @return compressed page size in kilobytes; or 0 if the tablespace is uncompressed, ULINT_UNDEFINED on error */ static ulint dict_sys_tables_get_flags( /*======================*/ const rec_t* rec) /*!< in: a record of SYS_TABLES */ { const byte* field; ulint len; ulint n_cols; ulint flags; field = rec_get_nth_field_old(rec, 5, &len); ut_a(len == 4); flags = mach_read_from_4(field); if (UNIV_LIKELY(flags == DICT_TABLE_ORDINARY)) { return(0); } field = rec_get_nth_field_old(rec, 4/*N_COLS*/, &len); n_cols = mach_read_from_4(field); if (UNIV_UNLIKELY(!(n_cols & 0x80000000UL))) { /* New file formats require ROW_FORMAT=COMPACT. */ return(ULINT_UNDEFINED); } switch (flags & (DICT_TF_FORMAT_MASK | DICT_TF_COMPACT)) { default: case DICT_TF_FORMAT_51 << DICT_TF_FORMAT_SHIFT: case DICT_TF_FORMAT_51 << DICT_TF_FORMAT_SHIFT | DICT_TF_COMPACT: /* flags should be DICT_TABLE_ORDINARY, or DICT_TF_FORMAT_MASK should be nonzero. */ return(ULINT_UNDEFINED); case DICT_TF_FORMAT_ZIP << DICT_TF_FORMAT_SHIFT | DICT_TF_COMPACT: #if DICT_TF_FORMAT_MAX > DICT_TF_FORMAT_ZIP # error "missing case labels for DICT_TF_FORMAT_ZIP .. DICT_TF_FORMAT_MAX" #endif /* We support this format. */ break; } if (UNIV_UNLIKELY((flags & DICT_TF_ZSSIZE_MASK) > (DICT_TF_ZSSIZE_MAX << DICT_TF_ZSSIZE_SHIFT))) { /* Unsupported compressed page size. */ return(ULINT_UNDEFINED); } if (UNIV_UNLIKELY(flags & (~0 << DICT_TF_BITS))) { /* Some unused bits are set. */ return(ULINT_UNDEFINED); } return(flags); } /********************************************************************//** In a crash recovery we already have all the tablespace objects created. This function compares the space id information in the InnoDB data dictionary to what we already read with fil_load_single_table_tablespaces(). In a normal startup, we create the tablespace objects for every table in InnoDB's data dictionary, if the corresponding .ibd file exists. We also scan the biggest space id, and store it to fil_system. */ UNIV_INTERN void dict_check_tablespaces_and_store_max_id( /*====================================*/ ibool in_crash_recovery) /*!< in: are we doing a crash recovery */ { dict_table_t* sys_tables; dict_index_t* sys_index; btr_pcur_t pcur; const rec_t* rec; ulint max_space_id; mtr_t mtr; mutex_enter(&(dict_sys->mutex)); mtr_start(&mtr); sys_tables = dict_table_get_low("SYS_TABLES"); sys_index = UT_LIST_GET_FIRST(sys_tables->indexes); ut_a(!dict_table_is_comp(sys_tables)); max_space_id = mtr_read_ulint(dict_hdr_get(&mtr) + DICT_HDR_MAX_SPACE_ID, MLOG_4BYTES, &mtr); fil_set_max_space_id_if_bigger(max_space_id); btr_pcur_open_at_index_side(TRUE, sys_index, BTR_SEARCH_LEAF, &pcur, TRUE, &mtr); loop: btr_pcur_move_to_next_user_rec(&pcur, &mtr); rec = btr_pcur_get_rec(&pcur); if (!btr_pcur_is_on_user_rec(&pcur)) { /* end of index */ btr_pcur_close(&pcur); mtr_commit(&mtr); /* We must make the tablespace cache aware of the biggest known space id */ /* printf("Biggest space id in data dictionary %lu\n", max_space_id); */ fil_set_max_space_id_if_bigger(max_space_id); mutex_exit(&(dict_sys->mutex)); return; } if (!rec_get_deleted_flag(rec, 0)) { /* We found one */ const byte* field; ulint len; ulint space_id; ulint flags; char* name; field = rec_get_nth_field_old(rec, 0, &len); name = mem_strdupl((char*) field, len); flags = dict_sys_tables_get_flags(rec); if (UNIV_UNLIKELY(flags == ULINT_UNDEFINED)) { field = rec_get_nth_field_old(rec, 5, &len); flags = mach_read_from_4(field); ut_print_timestamp(stderr); fputs(" InnoDB: Error: table ", stderr); ut_print_filename(stderr, name); fprintf(stderr, "\n" "InnoDB: in InnoDB data dictionary" " has unknown type %lx.\n", (ulong) flags); goto loop; } field = rec_get_nth_field_old(rec, 9, &len); ut_a(len == 4); space_id = mach_read_from_4(field); btr_pcur_store_position(&pcur, &mtr); mtr_commit(&mtr); if (space_id == 0) { /* The system tablespace always exists. */ } else if (in_crash_recovery) { /* Check that the tablespace (the .ibd file) really exists; print a warning to the .err log if not. Do not print warnings for temporary tables. */ ibool is_temp; field = rec_get_nth_field_old(rec, 4, &len); if (0x80000000UL & mach_read_from_4(field)) { /* ROW_FORMAT=COMPACT: read the is_temp flag from SYS_TABLES.MIX_LEN. */ field = rec_get_nth_field_old(rec, 7, &len); is_temp = mach_read_from_4(field) & DICT_TF2_TEMPORARY; } else { /* For tables created with old versions of InnoDB, SYS_TABLES.MIX_LEN may contain garbage. Such tables would always be in ROW_FORMAT=REDUNDANT. Pretend that all such tables are non-temporary. That is, do not suppress error printouts about temporary tables not being found. */ is_temp = FALSE; } fil_space_for_table_exists_in_mem( space_id, name, is_temp, TRUE, !is_temp); } else { /* It is a normal database startup: create the space object and check that the .ibd file exists. */ fil_open_single_table_tablespace(FALSE, space_id, flags, name); } mem_free(name); if (space_id > max_space_id) { max_space_id = space_id; } mtr_start(&mtr); btr_pcur_restore_position(BTR_SEARCH_LEAF, &pcur, &mtr); } goto loop; } /********************************************************************//** Loads a table column definition from a SYS_COLUMNS record to dict_table_t. @return error message, or NULL on success */ UNIV_INTERN const char* dict_load_column_low( /*=================*/ dict_table_t* table, /*!< in/out: table, could be NULL if we just populate a dict_column_t struct with information from a SYS_COLUMNS record */ mem_heap_t* heap, /*!< in/out: memory heap for temporary storage */ dict_col_t* column, /*!< out: dict_column_t to fill, or NULL if table != NULL */ table_id_t* table_id, /*!< out: table id */ const char** col_name, /*!< out: column name */ const rec_t* rec) /*!< in: SYS_COLUMNS record */ { char* name; const byte* field; ulint len; ulint mtype; ulint prtype; ulint col_len; ulint pos; ut_ad(table || column); if (UNIV_UNLIKELY(rec_get_deleted_flag(rec, 0))) { return("delete-marked record in SYS_COLUMNS"); } if (UNIV_UNLIKELY(rec_get_n_fields_old(rec) != 9)) { return("wrong number of columns in SYS_COLUMNS record"); } field = rec_get_nth_field_old(rec, 0/*TABLE_ID*/, &len); if (UNIV_UNLIKELY(len != 8)) { err_len: return("incorrect column length in SYS_COLUMNS"); } if (table_id) { *table_id = mach_read_from_8(field); } else if (UNIV_UNLIKELY(table->id != mach_read_from_8(field))) { return("SYS_COLUMNS.TABLE_ID mismatch"); } field = rec_get_nth_field_old(rec, 1/*POS*/, &len); if (UNIV_UNLIKELY(len != 4)) { goto err_len; } pos = mach_read_from_4(field); if (UNIV_UNLIKELY(table && table->n_def != pos)) { return("SYS_COLUMNS.POS mismatch"); } rec_get_nth_field_offs_old(rec, 2/*DB_TRX_ID*/, &len); if (UNIV_UNLIKELY(len != DATA_TRX_ID_LEN && len != UNIV_SQL_NULL)) { goto err_len; } rec_get_nth_field_offs_old(rec, 3/*DB_ROLL_PTR*/, &len); if (UNIV_UNLIKELY(len != DATA_ROLL_PTR_LEN && len != UNIV_SQL_NULL)) { goto err_len; } field = rec_get_nth_field_old(rec, 4/*NAME*/, &len); if (UNIV_UNLIKELY(len < 1 || len == UNIV_SQL_NULL)) { goto err_len; } name = mem_heap_strdupl(heap, (const char*) field, len); if (col_name) { *col_name = name; } field = rec_get_nth_field_old(rec, 5/*MTYPE*/, &len); if (UNIV_UNLIKELY(len != 4)) { goto err_len; } mtype = mach_read_from_4(field); field = rec_get_nth_field_old(rec, 6/*PRTYPE*/, &len); if (UNIV_UNLIKELY(len != 4)) { goto err_len; } prtype = mach_read_from_4(field); if (dtype_get_charset_coll(prtype) == 0 && dtype_is_string_type(mtype)) { /* The table was created with < 4.1.2. */ if (dtype_is_binary_string_type(mtype, prtype)) { /* Use the binary collation for string columns of binary type. */ prtype = dtype_form_prtype( prtype, DATA_MYSQL_BINARY_CHARSET_COLL); } else { /* Use the default charset for other than binary columns. */ prtype = dtype_form_prtype( prtype, data_mysql_default_charset_coll); } } field = rec_get_nth_field_old(rec, 7/*LEN*/, &len); if (UNIV_UNLIKELY(len != 4)) { goto err_len; } col_len = mach_read_from_4(field); field = rec_get_nth_field_old(rec, 8/*PREC*/, &len); if (UNIV_UNLIKELY(len != 4)) { goto err_len; } if (!column) { dict_mem_table_add_col(table, heap, name, mtype, prtype, col_len); } else { dict_mem_fill_column_struct(column, pos, mtype, prtype, col_len); } return(NULL); } /********************************************************************//** Loads definitions for table columns. */ static void dict_load_columns( /*==============*/ dict_table_t* table, /*!< in/out: table */ mem_heap_t* heap) /*!< in/out: memory heap for temporary storage */ { dict_table_t* sys_columns; dict_index_t* sys_index; btr_pcur_t pcur; dtuple_t* tuple; dfield_t* dfield; const rec_t* rec; byte* buf; ulint i; mtr_t mtr; ut_ad(mutex_own(&(dict_sys->mutex))); mtr_start(&mtr); sys_columns = dict_table_get_low("SYS_COLUMNS"); sys_index = UT_LIST_GET_FIRST(sys_columns->indexes); ut_a(!dict_table_is_comp(sys_columns)); ut_a(name_of_col_is(sys_columns, sys_index, 4, "NAME")); ut_a(name_of_col_is(sys_columns, sys_index, 8, "PREC")); tuple = dtuple_create(heap, 1); dfield = dtuple_get_nth_field(tuple, 0); buf = mem_heap_alloc(heap, 8); mach_write_to_8(buf, table->id); dfield_set_data(dfield, buf, 8); dict_index_copy_types(tuple, sys_index, 1); btr_pcur_open_on_user_rec(sys_index, tuple, PAGE_CUR_GE, BTR_SEARCH_LEAF, &pcur, &mtr); for (i = 0; i + DATA_N_SYS_COLS < (ulint) table->n_cols; i++) { const char* err_msg; rec = btr_pcur_get_rec(&pcur); ut_a(btr_pcur_is_on_user_rec(&pcur)); err_msg = dict_load_column_low(table, heap, NULL, NULL, NULL, rec); if (err_msg) { fprintf(stderr, "InnoDB: %s\n", err_msg); ut_error; } btr_pcur_move_to_next_user_rec(&pcur, &mtr); } btr_pcur_close(&pcur); mtr_commit(&mtr); } /** Error message for a delete-marked record in dict_load_field_low() */ static const char* dict_load_field_del = "delete-marked record in SYS_FIELDS"; /********************************************************************//** Loads an index field definition from a SYS_FIELDS record to dict_index_t. @return error message, or NULL on success */ UNIV_INTERN const char* dict_load_field_low( /*================*/ byte* index_id, /*!< in/out: index id (8 bytes) an "in" value if index != NULL and "out" if index == NULL */ dict_index_t* index, /*!< in/out: index, could be NULL if we just populate a dict_field_t struct with information from a SYS_FIELDSS record */ dict_field_t* sys_field, /*!< out: dict_field_t to be filled */ ulint* pos, /*!< out: Field position */ byte* last_index_id, /*!< in: last index id */ mem_heap_t* heap, /*!< in/out: memory heap for temporary storage */ const rec_t* rec) /*!< in: SYS_FIELDS record */ { const byte* field; ulint len; ulint pos_and_prefix_len; ulint prefix_len; ibool first_field; ulint position; /* Either index or sys_field is supplied, not both */ ut_a((!index) || (!sys_field)); if (UNIV_UNLIKELY(rec_get_deleted_flag(rec, 0))) { return(dict_load_field_del); } if (UNIV_UNLIKELY(rec_get_n_fields_old(rec) != 5)) { return("wrong number of columns in SYS_FIELDS record"); } field = rec_get_nth_field_old(rec, 0/*INDEX_ID*/, &len); if (UNIV_UNLIKELY(len != 8)) { err_len: return("incorrect column length in SYS_FIELDS"); } if (!index) { ut_a(last_index_id); memcpy(index_id, (const char*)field, 8); first_field = memcmp(index_id, last_index_id, 8); } else { first_field = (index->n_def == 0); if (memcmp(field, index_id, 8)) { return("SYS_FIELDS.INDEX_ID mismatch"); } } field = rec_get_nth_field_old(rec, 1/*POS*/, &len); if (UNIV_UNLIKELY(len != 4)) { goto err_len; } rec_get_nth_field_offs_old(rec, 2/*DB_TRX_ID*/, &len); if (UNIV_UNLIKELY(len != DATA_TRX_ID_LEN && len != UNIV_SQL_NULL)) { goto err_len; } rec_get_nth_field_offs_old(rec, 3/*DB_ROLL_PTR*/, &len); if (UNIV_UNLIKELY(len != DATA_ROLL_PTR_LEN && len != UNIV_SQL_NULL)) { goto err_len; } /* The next field stores the field position in the index and a possible column prefix length if the index field does not contain the whole column. The storage format is like this: if there is at least one prefix field in the index, then the HIGH 2 bytes contain the field number (index->n_def) and the low 2 bytes the prefix length for the field. Otherwise the field number (index->n_def) is contained in the 2 LOW bytes. */ pos_and_prefix_len = mach_read_from_4(field); if (index && UNIV_UNLIKELY ((pos_and_prefix_len & 0xFFFFUL) != index->n_def && (pos_and_prefix_len >> 16 & 0xFFFF) != index->n_def)) { return("SYS_FIELDS.POS mismatch"); } if (first_field || pos_and_prefix_len > 0xFFFFUL) { prefix_len = pos_and_prefix_len & 0xFFFFUL; position = (pos_and_prefix_len & 0xFFFF0000UL) >> 16; } else { prefix_len = 0; position = pos_and_prefix_len & 0xFFFFUL; } field = rec_get_nth_field_old(rec, 4, &len); if (UNIV_UNLIKELY(len < 1 || len == UNIV_SQL_NULL)) { goto err_len; } if (index) { dict_mem_index_add_field( index, mem_heap_strdupl(heap, (const char*) field, len), prefix_len); } else { ut_a(sys_field); ut_a(pos); sys_field->name = mem_heap_strdupl( heap, (const char*) field, len); sys_field->prefix_len = prefix_len; *pos = position; } return(NULL); } /********************************************************************//** Loads definitions for index fields. @return DB_SUCCESS if ok, DB_CORRUPTION if corruption */ static ulint dict_load_fields( /*=============*/ dict_index_t* index, /*!< in/out: index whose fields to load */ mem_heap_t* heap) /*!< in: memory heap for temporary storage */ { dict_table_t* sys_fields; dict_index_t* sys_index; btr_pcur_t pcur; dtuple_t* tuple; dfield_t* dfield; const rec_t* rec; byte* buf; ulint i; mtr_t mtr; ulint error; ut_ad(mutex_own(&(dict_sys->mutex))); mtr_start(&mtr); sys_fields = dict_table_get_low("SYS_FIELDS"); sys_index = UT_LIST_GET_FIRST(sys_fields->indexes); ut_a(!dict_table_is_comp(sys_fields)); ut_a(name_of_col_is(sys_fields, sys_index, 4, "COL_NAME")); tuple = dtuple_create(heap, 1); dfield = dtuple_get_nth_field(tuple, 0); buf = mem_heap_alloc(heap, 8); mach_write_to_8(buf, index->id); dfield_set_data(dfield, buf, 8); dict_index_copy_types(tuple, sys_index, 1); btr_pcur_open_on_user_rec(sys_index, tuple, PAGE_CUR_GE, BTR_SEARCH_LEAF, &pcur, &mtr); for (i = 0; i < index->n_fields; i++) { const char* err_msg; rec = btr_pcur_get_rec(&pcur); ut_a(btr_pcur_is_on_user_rec(&pcur)); err_msg = dict_load_field_low(buf, index, NULL, NULL, NULL, heap, rec); if (err_msg == dict_load_field_del) { /* There could be delete marked records in SYS_FIELDS because SYS_FIELDS.INDEX_ID can be updated by ALTER TABLE ADD INDEX. */ goto next_rec; } else if (err_msg) { fprintf(stderr, "InnoDB: %s\n", err_msg); error = DB_CORRUPTION; goto func_exit; } next_rec: btr_pcur_move_to_next_user_rec(&pcur, &mtr); } error = DB_SUCCESS; func_exit: btr_pcur_close(&pcur); mtr_commit(&mtr); return(error); } /** Error message for a delete-marked record in dict_load_index_low() */ static const char* dict_load_index_del = "delete-marked record in SYS_INDEXES"; /** Error message for table->id mismatch in dict_load_index_low() */ static const char* dict_load_index_id_err = "SYS_INDEXES.TABLE_ID mismatch"; /********************************************************************//** Loads an index definition from a SYS_INDEXES record to dict_index_t. If allocate=TRUE, we will create a dict_index_t structure and fill it accordingly. If allocated=FALSE, the dict_index_t will be supplied by the caller and filled with information read from the record. @return error message, or NULL on success */ UNIV_INTERN const char* dict_load_index_low( /*================*/ byte* table_id, /*!< in/out: table id (8 bytes), an "in" value if allocate=TRUE and "out" when allocate=FALSE */ const char* table_name, /*!< in: table name */ mem_heap_t* heap, /*!< in/out: temporary memory heap */ const rec_t* rec, /*!< in: SYS_INDEXES record */ ibool allocate, /*!< in: TRUE=allocate *index, FALSE=fill in a pre-allocated *index */ dict_index_t** index) /*!< out,own: index, or NULL */ { const byte* field; ulint len; ulint name_len; char* name_buf; index_id_t id; ulint n_fields; ulint type; ulint space; if (allocate) { /* If allocate=TRUE, no dict_index_t will be supplied. Initialize "*index" to NULL */ *index = NULL; } if (UNIV_UNLIKELY(rec_get_deleted_flag(rec, 0))) { return(dict_load_index_del); } if (UNIV_UNLIKELY(rec_get_n_fields_old(rec) != 9)) { return("wrong number of columns in SYS_INDEXES record"); } field = rec_get_nth_field_old(rec, 0/*TABLE_ID*/, &len); if (UNIV_UNLIKELY(len != 8)) { err_len: return("incorrect column length in SYS_INDEXES"); } if (!allocate) { /* We are reading a SYS_INDEXES record. Copy the table_id */ memcpy(table_id, (const char*)field, 8); } else if (memcmp(field, table_id, 8)) { /* Caller supplied table_id, verify it is the same id as on the index record */ return(dict_load_index_id_err); } field = rec_get_nth_field_old(rec, 1/*ID*/, &len); if (UNIV_UNLIKELY(len != 8)) { goto err_len; } id = mach_read_from_8(field); rec_get_nth_field_offs_old(rec, 2/*DB_TRX_ID*/, &len); if (UNIV_UNLIKELY(len != DATA_TRX_ID_LEN && len != UNIV_SQL_NULL)) { goto err_len; } rec_get_nth_field_offs_old(rec, 3/*DB_ROLL_PTR*/, &len); if (UNIV_UNLIKELY(len != DATA_ROLL_PTR_LEN && len != UNIV_SQL_NULL)) { goto err_len; } field = rec_get_nth_field_old(rec, 4/*NAME*/, &name_len); if (UNIV_UNLIKELY(name_len == UNIV_SQL_NULL)) { goto err_len; } name_buf = mem_heap_strdupl(heap, (const char*) field, name_len); field = rec_get_nth_field_old(rec, 5/*N_FIELDS*/, &len); if (UNIV_UNLIKELY(len != 4)) { goto err_len; } n_fields = mach_read_from_4(field); field = rec_get_nth_field_old(rec, 6/*TYPE*/, &len); if (UNIV_UNLIKELY(len != 4)) { goto err_len; } type = mach_read_from_4(field); field = rec_get_nth_field_old(rec, 7/*SPACE*/, &len); if (UNIV_UNLIKELY(len != 4)) { goto err_len; } space = mach_read_from_4(field); field = rec_get_nth_field_old(rec, 8/*PAGE_NO*/, &len); if (UNIV_UNLIKELY(len != 4)) { goto err_len; } if (allocate) { *index = dict_mem_index_create(table_name, name_buf, space, type, n_fields); } else { ut_a(*index); dict_mem_fill_index_struct(*index, NULL, NULL, name_buf, space, type, n_fields); } (*index)->id = id; (*index)->page = mach_read_from_4(field); ut_ad((*index)->page); return(NULL); } /********************************************************************//** Loads definitions for table indexes. Adds them to the data dictionary cache. @return DB_SUCCESS if ok, DB_CORRUPTION if corruption of dictionary table or DB_UNSUPPORTED if table has unknown index type */ static ulint dict_load_indexes( /*==============*/ dict_table_t* table, /*!< in/out: table */ mem_heap_t* heap) /*!< in: memory heap for temporary storage */ { dict_table_t* sys_indexes; dict_index_t* sys_index; btr_pcur_t pcur; dtuple_t* tuple; dfield_t* dfield; const rec_t* rec; byte* buf; mtr_t mtr; ulint error = DB_SUCCESS; ut_ad(mutex_own(&(dict_sys->mutex))); mtr_start(&mtr); sys_indexes = dict_table_get_low("SYS_INDEXES"); sys_index = UT_LIST_GET_FIRST(sys_indexes->indexes); ut_a(!dict_table_is_comp(sys_indexes)); ut_a(name_of_col_is(sys_indexes, sys_index, 4, "NAME")); ut_a(name_of_col_is(sys_indexes, sys_index, 8, "PAGE_NO")); tuple = dtuple_create(heap, 1); dfield = dtuple_get_nth_field(tuple, 0); buf = mem_heap_alloc(heap, 8); mach_write_to_8(buf, table->id); dfield_set_data(dfield, buf, 8); dict_index_copy_types(tuple, sys_index, 1); btr_pcur_open_on_user_rec(sys_index, tuple, PAGE_CUR_GE, BTR_SEARCH_LEAF, &pcur, &mtr); for (;;) { dict_index_t* index = NULL; const char* err_msg; if (!btr_pcur_is_on_user_rec(&pcur)) { break; } rec = btr_pcur_get_rec(&pcur); err_msg = dict_load_index_low(buf, table->name, heap, rec, TRUE, &index); ut_ad((index == NULL) == (err_msg != NULL)); if (err_msg == dict_load_index_id_err) { /* TABLE_ID mismatch means that we have run out of index definitions for the table. */ break; } else if (err_msg == dict_load_index_del) { /* Skip delete-marked records. */ goto next_rec; } else if (err_msg) { fprintf(stderr, "InnoDB: %s\n", err_msg); error = DB_CORRUPTION; goto func_exit; } ut_ad(index); /* We check for unsupported types first, so that the subsequent checks are relevant for the supported types. */ if (index->type & ~(DICT_CLUSTERED | DICT_UNIQUE)) { fprintf(stderr, "InnoDB: Error: unknown type %lu" " of index %s of table %s\n", (ulong) index->type, index->name, table->name); error = DB_UNSUPPORTED; dict_mem_index_free(index); goto func_exit; } else if (index->page == FIL_NULL) { fprintf(stderr, "InnoDB: Error: trying to load index %s" " for table %s\n" "InnoDB: but the index tree has been freed!\n", index->name, table->name); corrupted: dict_mem_index_free(index); error = DB_CORRUPTION; goto func_exit; } else if (!dict_index_is_clust(index) && NULL == dict_table_get_first_index(table)) { fputs("InnoDB: Error: trying to load index ", stderr); ut_print_name(stderr, NULL, FALSE, index->name); fputs(" for table ", stderr); ut_print_name(stderr, NULL, TRUE, table->name); fputs("\nInnoDB: but the first index" " is not clustered!\n", stderr); goto corrupted; } else if (table->id < DICT_HDR_FIRST_ID && (dict_index_is_clust(index) || ((table == dict_sys->sys_tables) && !strcmp("ID_IND", index->name)))) { /* The index was created in memory already at booting of the database server */ dict_mem_index_free(index); } else { dict_load_fields(index, heap); error = dict_index_add_to_cache(table, index, index->page, FALSE); /* The data dictionary tables should never contain invalid index definitions. If we ignored this error and simply did not load this index definition, the .frm file would disagree with the index definitions inside InnoDB. */ if (UNIV_UNLIKELY(error != DB_SUCCESS)) { goto func_exit; } } next_rec: btr_pcur_move_to_next_user_rec(&pcur, &mtr); } func_exit: btr_pcur_close(&pcur); mtr_commit(&mtr); return(error); } /********************************************************************//** Loads a table definition from a SYS_TABLES record to dict_table_t. Does not load any columns or indexes. @return error message, or NULL on success */ UNIV_INTERN const char* dict_load_table_low( /*================*/ const char* name, /*!< in: table name */ const rec_t* rec, /*!< in: SYS_TABLES record */ dict_table_t** table) /*!< out,own: table, or NULL */ { const byte* field; ulint len; ulint space; ulint n_cols; ulint flags; if (UNIV_UNLIKELY(rec_get_deleted_flag(rec, 0))) { return("delete-marked record in SYS_TABLES"); } if (UNIV_UNLIKELY(rec_get_n_fields_old(rec) != 10)) { return("wrong number of columns in SYS_TABLES record"); } rec_get_nth_field_offs_old(rec, 0/*NAME*/, &len); if (UNIV_UNLIKELY(len < 1 || len == UNIV_SQL_NULL)) { err_len: return("incorrect column length in SYS_TABLES"); } rec_get_nth_field_offs_old(rec, 1/*DB_TRX_ID*/, &len); if (UNIV_UNLIKELY(len != DATA_TRX_ID_LEN && len != UNIV_SQL_NULL)) { goto err_len; } rec_get_nth_field_offs_old(rec, 2/*DB_ROLL_PTR*/, &len); if (UNIV_UNLIKELY(len != DATA_ROLL_PTR_LEN && len != UNIV_SQL_NULL)) { goto err_len; } rec_get_nth_field_offs_old(rec, 3/*ID*/, &len); if (UNIV_UNLIKELY(len != 8)) { goto err_len; } field = rec_get_nth_field_old(rec, 4/*N_COLS*/, &len); if (UNIV_UNLIKELY(len != 4)) { goto err_len; } n_cols = mach_read_from_4(field); rec_get_nth_field_offs_old(rec, 5/*TYPE*/, &len); if (UNIV_UNLIKELY(len != 4)) { goto err_len; } rec_get_nth_field_offs_old(rec, 6/*MIX_ID*/, &len); if (UNIV_UNLIKELY(len != 8)) { goto err_len; } rec_get_nth_field_offs_old(rec, 7/*MIX_LEN*/, &len); if (UNIV_UNLIKELY(len != 4)) { goto err_len; } rec_get_nth_field_offs_old(rec, 8/*CLUSTER_ID*/, &len); if (UNIV_UNLIKELY(len != UNIV_SQL_NULL)) { goto err_len; } field = rec_get_nth_field_old(rec, 9/*SPACE*/, &len); if (UNIV_UNLIKELY(len != 4)) { goto err_len; } space = mach_read_from_4(field); /* Check if the tablespace exists and has the right name */ if (space != 0) { flags = dict_sys_tables_get_flags(rec); if (UNIV_UNLIKELY(flags == ULINT_UNDEFINED)) { field = rec_get_nth_field_old(rec, 5/*TYPE*/, &len); ut_ad(len == 4); /* this was checked earlier */ flags = mach_read_from_4(field); ut_print_timestamp(stderr); fputs(" InnoDB: Error: table ", stderr); ut_print_filename(stderr, name); fprintf(stderr, "\n" "InnoDB: in InnoDB data dictionary" " has unknown type %lx.\n", (ulong) flags); return(NULL); } } else { flags = 0; } /* The high-order bit of N_COLS is the "compact format" flag. For tables in that format, MIX_LEN may hold additional flags. */ if (n_cols & 0x80000000UL) { ulint flags2; flags |= DICT_TF_COMPACT; field = rec_get_nth_field_old(rec, 7, &len); if (UNIV_UNLIKELY(len != 4)) { goto err_len; } flags2 = mach_read_from_4(field); if (flags2 & (~0 << (DICT_TF2_BITS - DICT_TF2_SHIFT))) { ut_print_timestamp(stderr); fputs(" InnoDB: Warning: table ", stderr); ut_print_filename(stderr, name); fprintf(stderr, "\n" "InnoDB: in InnoDB data dictionary" " has unknown flags %lx.\n", (ulong) flags2); flags2 &= ~(~0 << (DICT_TF2_BITS - DICT_TF2_SHIFT)); } flags |= flags2 << DICT_TF2_SHIFT; } /* See if the tablespace is available. */ *table = dict_mem_table_create(name, space, n_cols & ~0x80000000UL, flags); field = rec_get_nth_field_old(rec, 3/*ID*/, &len); ut_ad(len == 8); /* this was checked earlier */ (*table)->id = mach_read_from_8(field); (*table)->ibd_file_missing = FALSE; return(NULL); } /********************************************************************//** Loads a table definition and also all its index definitions, and also the cluster definition if the table is a member in a cluster. Also loads all foreign key constraints where the foreign key is in the table or where a foreign key references columns in this table. Adds all these to the data dictionary cache. @return table, NULL if does not exist; if the table is stored in an .ibd file, but the file does not exist, then we set the ibd_file_missing flag TRUE in the table object we return */ UNIV_INTERN dict_table_t* dict_load_table( /*============*/ const char* name, /*!< in: table name in the databasename/tablename format */ ibool cached) /*!< in: TRUE=add to cache, FALSE=do not */ { dict_table_t* table; dict_table_t* sys_tables; btr_pcur_t pcur; dict_index_t* sys_index; dtuple_t* tuple; mem_heap_t* heap; dfield_t* dfield; const rec_t* rec; const byte* field; ulint len; ulint err; const char* err_msg; mtr_t mtr; ut_ad(mutex_own(&(dict_sys->mutex))); heap = mem_heap_create(32000); mtr_start(&mtr); sys_tables = dict_table_get_low("SYS_TABLES"); sys_index = UT_LIST_GET_FIRST(sys_tables->indexes); ut_a(!dict_table_is_comp(sys_tables)); ut_a(name_of_col_is(sys_tables, sys_index, 3, "ID")); ut_a(name_of_col_is(sys_tables, sys_index, 4, "N_COLS")); ut_a(name_of_col_is(sys_tables, sys_index, 5, "TYPE")); ut_a(name_of_col_is(sys_tables, sys_index, 7, "MIX_LEN")); ut_a(name_of_col_is(sys_tables, sys_index, 9, "SPACE")); tuple = dtuple_create(heap, 1); dfield = dtuple_get_nth_field(tuple, 0); dfield_set_data(dfield, name, ut_strlen(name)); dict_index_copy_types(tuple, sys_index, 1); btr_pcur_open_on_user_rec(sys_index, tuple, PAGE_CUR_GE, BTR_SEARCH_LEAF, &pcur, &mtr); rec = btr_pcur_get_rec(&pcur); if (!btr_pcur_is_on_user_rec(&pcur) || rec_get_deleted_flag(rec, 0)) { /* Not found */ err_exit: btr_pcur_close(&pcur); mtr_commit(&mtr); mem_heap_free(heap); return(NULL); } field = rec_get_nth_field_old(rec, 0, &len); /* Check if the table name in record is the searched one */ if (len != ut_strlen(name) || ut_memcmp(name, field, len) != 0) { goto err_exit; } err_msg = dict_load_table_low(name, rec, &table); if (err_msg) { ut_print_timestamp(stderr); fprintf(stderr, " InnoDB: %s\n", err_msg); goto err_exit; } if (table->space == 0) { /* The system tablespace is always available. */ } else if (!fil_space_for_table_exists_in_mem( table->space, name, (table->flags >> DICT_TF2_SHIFT) & DICT_TF2_TEMPORARY, FALSE, FALSE)) { if (table->flags & (DICT_TF2_TEMPORARY << DICT_TF2_SHIFT)) { /* Do not bother to retry opening temporary tables. */ table->ibd_file_missing = TRUE; } else { ut_print_timestamp(stderr); fprintf(stderr, " InnoDB: error: space object of table "); ut_print_filename(stderr, name); fprintf(stderr, ",\n" "InnoDB: space id %lu did not exist in memory." " Retrying an open.\n", (ulong) table->space); /* Try to open the tablespace */ if (!fil_open_single_table_tablespace( TRUE, table->space, table->flags == DICT_TF_COMPACT ? 0 : table->flags & ~(~0 << DICT_TF_BITS), name)) { /* We failed to find a sensible tablespace file */ table->ibd_file_missing = TRUE; } } } btr_pcur_close(&pcur); mtr_commit(&mtr); dict_load_columns(table, heap); if (cached) { dict_table_add_to_cache(table, heap); } else { dict_table_add_system_columns(table, heap); } mem_heap_empty(heap); err = dict_load_indexes(table, heap); /* Initialize table foreign_child value. Its value could be changed when dict_load_foreigns() is called below */ table->fk_max_recusive_level = 0; /* If the force recovery flag is set, we open the table irrespective of the error condition, since the user may want to dump data from the clustered index. However we load the foreign key information only if all indexes were loaded. */ if (!cached) { } else if (err == DB_SUCCESS) { err = dict_load_foreigns(table->name, TRUE, TRUE); if (err != DB_SUCCESS) { dict_table_remove_from_cache(table); table = NULL; } else { table->fk_max_recusive_level = 0; } } else if (!srv_force_recovery) { dict_table_remove_from_cache(table); table = NULL; } #if 0 if (err != DB_SUCCESS && table != NULL) { mutex_enter(&dict_foreign_err_mutex); ut_print_timestamp(stderr); fprintf(stderr, " InnoDB: Error: could not make a foreign key" " definition to match\n" "InnoDB: the foreign key table" " or the referenced table!\n" "InnoDB: The data dictionary of InnoDB is corrupt." " You may need to drop\n" "InnoDB: and recreate the foreign key table" " or the referenced table.\n" "InnoDB: Submit a detailed bug report" " to http://bugs.mysql.com\n" "InnoDB: Latest foreign key error printout:\n%s\n", dict_foreign_err_buf); mutex_exit(&dict_foreign_err_mutex); } #endif /* 0 */ mem_heap_free(heap); return(table); } /***********************************************************************//** Loads a table object based on the table id. @return table; NULL if table does not exist */ UNIV_INTERN dict_table_t* dict_load_table_on_id( /*==================*/ table_id_t table_id) /*!< in: table id */ { byte id_buf[8]; btr_pcur_t pcur; mem_heap_t* heap; dtuple_t* tuple; dfield_t* dfield; dict_index_t* sys_table_ids; dict_table_t* sys_tables; const rec_t* rec; const byte* field; ulint len; dict_table_t* table; mtr_t mtr; ut_ad(mutex_own(&(dict_sys->mutex))); /* NOTE that the operation of this function is protected by the dictionary mutex, and therefore no deadlocks can occur with other dictionary operations. */ mtr_start(&mtr); /*---------------------------------------------------*/ /* Get the secondary index based on ID for table SYS_TABLES */ sys_tables = dict_sys->sys_tables; sys_table_ids = dict_table_get_next_index( dict_table_get_first_index(sys_tables)); ut_a(!dict_table_is_comp(sys_tables)); heap = mem_heap_create(256); tuple = dtuple_create(heap, 1); dfield = dtuple_get_nth_field(tuple, 0); /* Write the table id in byte format to id_buf */ mach_write_to_8(id_buf, table_id); dfield_set_data(dfield, id_buf, 8); dict_index_copy_types(tuple, sys_table_ids, 1); btr_pcur_open_on_user_rec(sys_table_ids, tuple, PAGE_CUR_GE, BTR_SEARCH_LEAF, &pcur, &mtr); rec = btr_pcur_get_rec(&pcur); if (!btr_pcur_is_on_user_rec(&pcur) || rec_get_deleted_flag(rec, 0)) { /* Not found */ btr_pcur_close(&pcur); mtr_commit(&mtr); mem_heap_free(heap); return(NULL); } /*---------------------------------------------------*/ /* Now we have the record in the secondary index containing the table ID and NAME */ rec = btr_pcur_get_rec(&pcur); field = rec_get_nth_field_old(rec, 0, &len); ut_ad(len == 8); /* Check if the table id in record is the one searched for */ if (table_id != mach_read_from_8(field)) { btr_pcur_close(&pcur); mtr_commit(&mtr); mem_heap_free(heap); return(NULL); } /* Now we get the table name from the record */ field = rec_get_nth_field_old(rec, 1, &len); /* Load the table definition to memory */ table = dict_load_table(mem_heap_strdupl(heap, (char*) field, len), TRUE); btr_pcur_close(&pcur); mtr_commit(&mtr); mem_heap_free(heap); return(table); } /********************************************************************//** This function is called when the database is booted. Loads system table index definitions except for the clustered index which is added to the dictionary cache at booting before calling this function. */ UNIV_INTERN void dict_load_sys_table( /*================*/ dict_table_t* table) /*!< in: system table */ { mem_heap_t* heap; ut_ad(mutex_own(&(dict_sys->mutex))); heap = mem_heap_create(1000); dict_load_indexes(table, heap); mem_heap_free(heap); } /********************************************************************//** Loads foreign key constraint col names (also for the referenced table). */ static void dict_load_foreign_cols( /*===================*/ const char* id, /*!< in: foreign constraint id as a null-terminated string */ dict_foreign_t* foreign)/*!< in: foreign constraint object */ { dict_table_t* sys_foreign_cols; dict_index_t* sys_index; btr_pcur_t pcur; dtuple_t* tuple; dfield_t* dfield; const rec_t* rec; const byte* field; ulint len; ulint i; mtr_t mtr; ut_ad(mutex_own(&(dict_sys->mutex))); foreign->foreign_col_names = mem_heap_alloc( foreign->heap, foreign->n_fields * sizeof(void*)); foreign->referenced_col_names = mem_heap_alloc( foreign->heap, foreign->n_fields * sizeof(void*)); mtr_start(&mtr); sys_foreign_cols = dict_table_get_low("SYS_FOREIGN_COLS"); sys_index = UT_LIST_GET_FIRST(sys_foreign_cols->indexes); ut_a(!dict_table_is_comp(sys_foreign_cols)); tuple = dtuple_create(foreign->heap, 1); dfield = dtuple_get_nth_field(tuple, 0); dfield_set_data(dfield, id, ut_strlen(id)); dict_index_copy_types(tuple, sys_index, 1); btr_pcur_open_on_user_rec(sys_index, tuple, PAGE_CUR_GE, BTR_SEARCH_LEAF, &pcur, &mtr); for (i = 0; i < foreign->n_fields; i++) { rec = btr_pcur_get_rec(&pcur); ut_a(btr_pcur_is_on_user_rec(&pcur)); ut_a(!rec_get_deleted_flag(rec, 0)); field = rec_get_nth_field_old(rec, 0, &len); ut_a(len == ut_strlen(id)); ut_a(ut_memcmp(id, field, len) == 0); field = rec_get_nth_field_old(rec, 1, &len); ut_a(len == 4); ut_a(i == mach_read_from_4(field)); field = rec_get_nth_field_old(rec, 4, &len); foreign->foreign_col_names[i] = mem_heap_strdupl( foreign->heap, (char*) field, len); field = rec_get_nth_field_old(rec, 5, &len); foreign->referenced_col_names[i] = mem_heap_strdupl( foreign->heap, (char*) field, len); btr_pcur_move_to_next_user_rec(&pcur, &mtr); } btr_pcur_close(&pcur); mtr_commit(&mtr); } /***********************************************************************//** Loads a foreign key constraint to the dictionary cache. @return DB_SUCCESS or error code */ static ulint dict_load_foreign( /*==============*/ const char* id, /*!< in: foreign constraint id as a null-terminated string */ ibool check_charsets, /*!< in: TRUE=check charset compatibility */ ibool check_recursive) /*!< in: Whether to record the foreign table parent count to avoid unlimited recursive load of chained foreign tables */ { dict_foreign_t* foreign; dict_table_t* sys_foreign; btr_pcur_t pcur; dict_index_t* sys_index; dtuple_t* tuple; mem_heap_t* heap2; dfield_t* dfield; const rec_t* rec; const byte* field; ulint len; ulint n_fields_and_type; mtr_t mtr; dict_table_t* for_table; dict_table_t* ref_table; ut_ad(mutex_own(&(dict_sys->mutex))); heap2 = mem_heap_create(1000); mtr_start(&mtr); sys_foreign = dict_table_get_low("SYS_FOREIGN"); sys_index = UT_LIST_GET_FIRST(sys_foreign->indexes); ut_a(!dict_table_is_comp(sys_foreign)); tuple = dtuple_create(heap2, 1); dfield = dtuple_get_nth_field(tuple, 0); dfield_set_data(dfield, id, ut_strlen(id)); dict_index_copy_types(tuple, sys_index, 1); btr_pcur_open_on_user_rec(sys_index, tuple, PAGE_CUR_GE, BTR_SEARCH_LEAF, &pcur, &mtr); rec = btr_pcur_get_rec(&pcur); if (!btr_pcur_is_on_user_rec(&pcur) || rec_get_deleted_flag(rec, 0)) { /* Not found */ fprintf(stderr, "InnoDB: Error A: cannot load foreign constraint %s\n", id); btr_pcur_close(&pcur); mtr_commit(&mtr); mem_heap_free(heap2); return(DB_ERROR); } field = rec_get_nth_field_old(rec, 0, &len); /* Check if the id in record is the searched one */ if (len != ut_strlen(id) || ut_memcmp(id, field, len) != 0) { fprintf(stderr, "InnoDB: Error B: cannot load foreign constraint %s\n", id); btr_pcur_close(&pcur); mtr_commit(&mtr); mem_heap_free(heap2); return(DB_ERROR); } /* Read the table names and the number of columns associated with the constraint */ mem_heap_free(heap2); foreign = dict_mem_foreign_create(); n_fields_and_type = mach_read_from_4( rec_get_nth_field_old(rec, 5, &len)); ut_a(len == 4); /* We store the type in the bits 24..29 of n_fields_and_type. */ foreign->type = (unsigned int) (n_fields_and_type >> 24); foreign->n_fields = (unsigned int) (n_fields_and_type & 0x3FFUL); foreign->id = mem_heap_strdup(foreign->heap, id); field = rec_get_nth_field_old(rec, 3, &len); foreign->foreign_table_name = mem_heap_strdupl( foreign->heap, (char*) field, len); field = rec_get_nth_field_old(rec, 4, &len); foreign->referenced_table_name = mem_heap_strdupl( foreign->heap, (char*) field, len); btr_pcur_close(&pcur); mtr_commit(&mtr); dict_load_foreign_cols(id, foreign); ref_table = dict_table_check_if_in_cache_low( foreign->referenced_table_name); /* We could possibly wind up in a deep recursive calls if we call dict_table_get_low() again here if there is a chain of tables concatenated together with foreign constraints. In such case, each table is both a parent and child of the other tables, and act as a "link" in such table chains. To avoid such scenario, we would need to check the number of ancesters the current table has. If that exceeds DICT_FK_MAX_CHAIN_LEN, we will stop loading the child table. Foreign constraints are loaded in a Breath First fashion, that is, the index on FOR_NAME is scanned first, and then index on REF_NAME. So foreign constrains in which current table is a child (foreign table) are loaded first, and then those constraints where current table is a parent (referenced) table. Thus we could check the parent (ref_table) table's reference count (fk_max_recusive_level) to know how deep the recursive call is. If the parent table (ref_table) is already loaded, and its fk_max_recusive_level is larger than DICT_FK_MAX_CHAIN_LEN, we will stop the recursive loading by skipping loading the child table. It will not affect foreign constraint check for DMLs since child table will be loaded at that time for the constraint check. */ if (!ref_table || ref_table->fk_max_recusive_level < DICT_FK_MAX_RECURSIVE_LOAD) { /* If the foreign table is not yet in the dictionary cache, we have to load it so that we are able to make type comparisons in the next function call. */ for_table = dict_table_get_low(foreign->foreign_table_name); if (for_table && ref_table && check_recursive) { /* This is to record the longest chain of ancesters this table has, if the parent has more ancesters than this table has, record it after add 1 (for this parent */ if (ref_table->fk_max_recusive_level >= for_table->fk_max_recusive_level) { for_table->fk_max_recusive_level = ref_table->fk_max_recusive_level + 1; } } } /* Note that there may already be a foreign constraint object in the dictionary cache for this constraint: then the following call only sets the pointers in it to point to the appropriate table and index objects and frees the newly created object foreign. Adding to the cache should always succeed since we are not creating a new foreign key constraint but loading one from the data dictionary. */ return(dict_foreign_add_to_cache(foreign, check_charsets)); } /***********************************************************************//** Loads foreign key constraints where the table is either the foreign key holder or where the table is referenced by a foreign key. Adds these constraints to the data dictionary. Note that we know that the dictionary cache already contains all constraints where the other relevant table is already in the dictionary cache. @return DB_SUCCESS or error code */ UNIV_INTERN ulint dict_load_foreigns( /*===============*/ const char* table_name, /*!< in: table name */ ibool check_recursive,/*!< in: Whether to check recursive load of tables chained by FK */ ibool check_charsets) /*!< in: TRUE=check charset compatibility */ { btr_pcur_t pcur; mem_heap_t* heap; dtuple_t* tuple; dfield_t* dfield; dict_index_t* sec_index; dict_table_t* sys_foreign; const rec_t* rec; const byte* field; ulint len; char* id ; ulint err; mtr_t mtr; ut_ad(mutex_own(&(dict_sys->mutex))); sys_foreign = dict_table_get_low("SYS_FOREIGN"); if (sys_foreign == NULL) { /* No foreign keys defined yet in this database */ fprintf(stderr, "InnoDB: Error: no foreign key system tables" " in the database\n"); return(DB_ERROR); } ut_a(!dict_table_is_comp(sys_foreign)); mtr_start(&mtr); /* Get the secondary index based on FOR_NAME from table SYS_FOREIGN */ sec_index = dict_table_get_next_index( dict_table_get_first_index(sys_foreign)); start_load: heap = mem_heap_create(256); tuple = dtuple_create(heap, 1); dfield = dtuple_get_nth_field(tuple, 0); dfield_set_data(dfield, table_name, ut_strlen(table_name)); dict_index_copy_types(tuple, sec_index, 1); btr_pcur_open_on_user_rec(sec_index, tuple, PAGE_CUR_GE, BTR_SEARCH_LEAF, &pcur, &mtr); loop: rec = btr_pcur_get_rec(&pcur); if (!btr_pcur_is_on_user_rec(&pcur)) { /* End of index */ goto load_next_index; } /* Now we have the record in the secondary index containing a table name and a foreign constraint ID */ rec = btr_pcur_get_rec(&pcur); field = rec_get_nth_field_old(rec, 0, &len); /* Check if the table name in the record is the one searched for; the following call does the comparison in the latin1_swedish_ci charset-collation, in a case-insensitive way. */ if (0 != cmp_data_data(dfield_get_type(dfield)->mtype, dfield_get_type(dfield)->prtype, dfield_get_data(dfield), dfield_get_len(dfield), field, len)) { goto load_next_index; } /* Since table names in SYS_FOREIGN are stored in a case-insensitive order, we have to check that the table name matches also in a binary string comparison. On Unix, MySQL allows table names that only differ in character case. */ if (0 != ut_memcmp(field, table_name, len)) { goto next_rec; } if (rec_get_deleted_flag(rec, 0)) { goto next_rec; } /* Now we get a foreign key constraint id */ field = rec_get_nth_field_old(rec, 1, &len); id = mem_heap_strdupl(heap, (char*) field, len); btr_pcur_store_position(&pcur, &mtr); mtr_commit(&mtr); /* Load the foreign constraint definition to the dictionary cache */ err = dict_load_foreign(id, check_charsets, check_recursive); if (err != DB_SUCCESS) { btr_pcur_close(&pcur); mem_heap_free(heap); return(err); } mtr_start(&mtr); btr_pcur_restore_position(BTR_SEARCH_LEAF, &pcur, &mtr); next_rec: btr_pcur_move_to_next_user_rec(&pcur, &mtr); goto loop; load_next_index: btr_pcur_close(&pcur); mtr_commit(&mtr); mem_heap_free(heap); sec_index = dict_table_get_next_index(sec_index); if (sec_index != NULL) { mtr_start(&mtr); /* Switch to scan index on REF_NAME, fk_max_recusive_level already been updated when scanning FOR_NAME index, no need to update again */ check_recursive = FALSE; goto start_load; } return(DB_SUCCESS); }