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handler.cc
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handler.cc
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/* Copyright (c) 2000, 2016, Oracle and/or its affiliates.
Copyright (c) 2009, 2023, MariaDB Corporation.
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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA */
/** @file handler.cc
@brief
Handler-calling-functions
*/
#include "mariadb.h"
#include <inttypes.h>
#include "sql_priv.h"
#include "unireg.h"
#include "rpl_rli.h"
#include "sql_cache.h" // query_cache, query_cache_*
#include "sql_connect.h" // global_table_stats
#include "key.h" // key_copy, key_unpack, key_cmp_if_same, key_cmp
#include "sql_table.h" // build_table_filename
#include "sql_parse.h" // check_stack_overrun
#include "sql_base.h" // TDC_element
#include "discover.h" // extension_based_table_discovery, etc
#include "log_event.h" // *_rows_log_event
#include "create_options.h"
#include <myisampack.h>
#include "transaction.h"
#include "myisam.h"
#include "probes_mysql.h"
#include <mysql/psi/mysql_table.h>
#include <pfs_transaction_provider.h>
#include <mysql/psi/mysql_transaction.h>
#include "debug_sync.h" // DEBUG_SYNC
#include "debug.h" // debug_decrement_counter
#include "sql_audit.h"
#include "ha_sequence.h"
#include "rowid_filter.h"
#include "mysys_err.h"
#include "optimizer_defaults.h"
#ifdef WITH_PARTITION_STORAGE_ENGINE
#include "ha_partition.h"
#endif
#ifdef WITH_ARIA_STORAGE_ENGINE
#include "../storage/maria/ha_maria.h"
#endif
#include "semisync_master.h"
#include "wsrep_mysqld.h"
#ifdef WITH_WSREP
#include "wsrep_binlog.h"
#include "wsrep_xid.h"
#include "wsrep_thd.h"
#include "wsrep_trans_observer.h" /* wsrep transaction hooks */
#include "wsrep_var.h" /* wsrep_hton_check() */
#endif /* WITH_WSREP */
/**
@def MYSQL_TABLE_LOCK_WAIT
Instrumentation helper for table io_waits.
@param OP the table operation to be performed
@param FLAGS per table operation flags.
@param PAYLOAD the code to instrument.
@sa MYSQL_END_TABLE_WAIT.
*/
#ifdef HAVE_PSI_TABLE_INTERFACE
#define MYSQL_TABLE_LOCK_WAIT(OP, FLAGS, PAYLOAD) \
{ \
if (m_psi != NULL) \
{ \
PSI_table_locker *locker; \
PSI_table_locker_state state; \
locker= PSI_TABLE_CALL(start_table_lock_wait) \
(& state, m_psi, OP, FLAGS, \
__FILE__, __LINE__); \
PAYLOAD \
if (locker != NULL) \
PSI_TABLE_CALL(end_table_lock_wait)(locker); \
} \
else \
{ \
PAYLOAD \
} \
}
#else
#define MYSQL_TABLE_LOCK_WAIT(OP, FLAGS, PAYLOAD) \
PAYLOAD
#endif
/*
While we have legacy_db_type, we have this array to
check for dups and to find handlerton from legacy_db_type.
Remove when legacy_db_type is finally gone
*/
st_plugin_int *hton2plugin[MAX_HA];
static handlerton *installed_htons[128];
#define BITMAP_STACKBUF_SIZE (128/8)
KEY_CREATE_INFO default_key_create_info=
{ HA_KEY_ALG_UNDEF, 0, 0, {NullS, 0}, {NullS, 0}, false };
/* number of entries in handlertons[] */
ulong total_ha= 0;
/* number of storage engines (from handlertons[]) that support 2pc */
ulong total_ha_2pc= 0;
#ifdef DBUG_ASSERT_EXISTS
/*
Number of non-mandatory 2pc handlertons whose initialization failed
to estimate total_ha_2pc value under supposition of the failures
have not occcured.
*/
ulong failed_ha_2pc= 0;
#endif
/* size of savepoint storage area (see ha_init) */
ulong savepoint_alloc_size= 0;
static const LEX_CSTRING sys_table_aliases[]=
{
{ STRING_WITH_LEN("INNOBASE") }, { STRING_WITH_LEN("INNODB") },
{ STRING_WITH_LEN("HEAP") }, { STRING_WITH_LEN("MEMORY") },
{ STRING_WITH_LEN("MERGE") }, { STRING_WITH_LEN("MRG_MYISAM") },
{ STRING_WITH_LEN("Maria") }, { STRING_WITH_LEN("Aria") },
{NullS, 0}
};
const LEX_CSTRING ha_row_type[]=
{
{ STRING_WITH_LEN("") },
{ STRING_WITH_LEN("FIXED") },
{ STRING_WITH_LEN("DYNAMIC") },
{ STRING_WITH_LEN("COMPRESSED") },
{ STRING_WITH_LEN("REDUNDANT") },
{ STRING_WITH_LEN("COMPACT") },
{ STRING_WITH_LEN("PAGE") }
};
const char *tx_isolation_names[]=
{ "READ-UNCOMMITTED", "READ-COMMITTED", "REPEATABLE-READ", "SERIALIZABLE",
NullS};
TYPELIB tx_isolation_typelib= {array_elements(tx_isolation_names)-1,"",
tx_isolation_names, NULL};
static TYPELIB known_extensions= {0,"known_exts", NULL, NULL};
uint known_extensions_id= 0;
class Table_exists_error_handler : public Internal_error_handler
{
public:
Table_exists_error_handler()
: m_handled_errors(0), m_unhandled_errors(0)
{}
bool handle_condition(THD *thd,
uint sql_errno,
const char* sqlstate,
Sql_condition::enum_warning_level *level,
const char* msg,
Sql_condition ** cond_hdl)
{
*cond_hdl= NULL;
if (non_existing_table_error(sql_errno))
{
m_handled_errors++;
return TRUE;
}
if (*level == Sql_condition::WARN_LEVEL_ERROR)
m_unhandled_errors++;
return FALSE;
}
bool safely_trapped_errors()
{
return ((m_handled_errors > 0) && (m_unhandled_errors == 0));
}
private:
int m_handled_errors;
int m_unhandled_errors;
};
static int commit_one_phase_2(THD *thd, bool all, THD_TRANS *trans,
bool is_real_trans);
static plugin_ref ha_default_plugin(THD *thd)
{
if (thd->variables.table_plugin)
return thd->variables.table_plugin;
return my_plugin_lock(thd, global_system_variables.table_plugin);
}
static plugin_ref ha_default_tmp_plugin(THD *thd)
{
if (thd->variables.tmp_table_plugin)
return thd->variables.tmp_table_plugin;
if (global_system_variables.tmp_table_plugin)
return my_plugin_lock(thd, global_system_variables.tmp_table_plugin);
return ha_default_plugin(thd);
}
/** @brief
Return the default storage engine handlerton for thread
SYNOPSIS
ha_default_handlerton(thd)
thd current thread
RETURN
pointer to handlerton
*/
handlerton *ha_default_handlerton(THD *thd)
{
plugin_ref plugin= ha_default_plugin(thd);
DBUG_ASSERT(plugin);
handlerton *hton= plugin_hton(plugin);
DBUG_ASSERT(hton);
return hton;
}
handlerton *ha_default_tmp_handlerton(THD *thd)
{
plugin_ref plugin= ha_default_tmp_plugin(thd);
DBUG_ASSERT(plugin);
handlerton *hton= plugin_hton(plugin);
DBUG_ASSERT(hton);
return hton;
}
/** @brief
Return the storage engine handlerton for the supplied name
SYNOPSIS
ha_resolve_by_name(thd, name)
thd current thread
name name of storage engine
RETURN
pointer to storage engine plugin handle
*/
plugin_ref ha_resolve_by_name(THD *thd, const LEX_CSTRING *name,
bool tmp_table)
{
const LEX_CSTRING *table_alias;
plugin_ref plugin;
redo:
if (thd && !my_charset_latin1.strnncoll(
(const uchar *)name->str, name->length,
(const uchar *)STRING_WITH_LEN("DEFAULT"), 0))
return tmp_table ? ha_default_tmp_plugin(thd) : ha_default_plugin(thd);
if ((plugin= my_plugin_lock_by_name(thd, name, MYSQL_STORAGE_ENGINE_PLUGIN)))
{
handlerton *hton= plugin_hton(plugin);
if (hton && !(hton->flags & HTON_NOT_USER_SELECTABLE))
return plugin;
/*
unlocking plugin immediately after locking is relatively low cost.
*/
plugin_unlock(thd, plugin);
}
/*
We check for the historical aliases.
*/
for (table_alias= sys_table_aliases; table_alias->str; table_alias+= 2)
{
if (!my_charset_latin1.strnncoll(
(const uchar *)name->str, name->length,
(const uchar *)table_alias->str, table_alias->length))
{
name= table_alias + 1;
goto redo;
}
}
return NULL;
}
bool
Storage_engine_name::resolve_storage_engine_with_error(THD *thd,
handlerton **ha,
bool tmp_table)
{
if (plugin_ref plugin= ha_resolve_by_name(thd, &m_storage_engine_name,
tmp_table))
{
*ha= plugin_hton(plugin);
return false;
}
*ha= NULL;
if (thd->variables.sql_mode & MODE_NO_ENGINE_SUBSTITUTION)
{
my_error(ER_UNKNOWN_STORAGE_ENGINE, MYF(0), m_storage_engine_name.str);
return true;
}
push_warning_printf(thd, Sql_condition::WARN_LEVEL_WARN,
ER_UNKNOWN_STORAGE_ENGINE,
ER_THD(thd, ER_UNKNOWN_STORAGE_ENGINE),
m_storage_engine_name.str);
return false;
}
plugin_ref ha_lock_engine(THD *thd, const handlerton *hton)
{
if (hton)
{
st_plugin_int *plugin= hton2plugin[hton->slot];
return my_plugin_lock(thd, plugin_int_to_ref(plugin));
}
return NULL;
}
handlerton *ha_resolve_by_legacy_type(THD *thd, enum legacy_db_type db_type)
{
plugin_ref plugin;
switch (db_type) {
case DB_TYPE_DEFAULT:
return ha_default_handlerton(thd);
default:
if (db_type > DB_TYPE_UNKNOWN && db_type < DB_TYPE_DEFAULT &&
(plugin= ha_lock_engine(thd, installed_htons[db_type])))
return plugin_hton(plugin);
/* fall through */
case DB_TYPE_UNKNOWN:
return NULL;
}
}
/**
Use other database handler if databasehandler is not compiled in.
*/
handlerton *ha_checktype(THD *thd, handlerton *hton, bool no_substitute)
{
if (ha_storage_engine_is_enabled(hton))
return hton;
if (no_substitute)
return NULL;
return ha_default_handlerton(thd);
} /* ha_checktype */
handler *get_new_handler(TABLE_SHARE *share, MEM_ROOT *alloc,
handlerton *db_type)
{
handler *file;
DBUG_ENTER("get_new_handler");
DBUG_PRINT("enter", ("alloc: %p", alloc));
if (ha_storage_engine_is_enabled(db_type))
{
if ((file= db_type->create(db_type, share, alloc)))
file->init();
DBUG_RETURN(file);
}
/*
Try the default table type
Here the call to current_thd() is ok as we call this function a lot of
times but we enter this branch very seldom.
*/
file= get_new_handler(share, alloc, ha_default_handlerton(current_thd));
DBUG_RETURN(file);
}
#ifdef WITH_PARTITION_STORAGE_ENGINE
handler *get_ha_partition(partition_info *part_info)
{
ha_partition *partition;
DBUG_ENTER("get_ha_partition");
if ((partition= new ha_partition(partition_hton, part_info)))
{
if (partition->initialize_partition(current_thd->mem_root))
{
delete partition;
partition= 0;
}
else
partition->init();
}
else
{
my_error(ER_OUTOFMEMORY, MYF(ME_FATAL),
static_cast<int>(sizeof(ha_partition)));
}
DBUG_RETURN(((handler*) partition));
}
#endif
static const char **handler_errmsgs;
C_MODE_START
static const char **get_handler_errmsgs(int nr)
{
return handler_errmsgs;
}
C_MODE_END
/**
Register handler error messages for use with my_error().
@retval
0 OK
@retval
!=0 Error
*/
int ha_init_errors(void)
{
#define SETMSG(nr, msg) handler_errmsgs[(nr) - HA_ERR_FIRST]= (msg)
/* Allocate a pointer array for the error message strings. */
/* Zerofill it to avoid uninitialized gaps. */
if (! (handler_errmsgs= (const char**) my_malloc(key_memory_handler_errmsgs,
HA_ERR_ERRORS * sizeof(char*),
MYF(MY_WME | MY_ZEROFILL))))
return 1;
/* Set the dedicated error messages. */
SETMSG(HA_ERR_KEY_NOT_FOUND, ER_DEFAULT(ER_KEY_NOT_FOUND));
SETMSG(HA_ERR_FOUND_DUPP_KEY, ER_DEFAULT(ER_DUP_KEY));
SETMSG(HA_ERR_RECORD_CHANGED, "Update which is recoverable");
SETMSG(HA_ERR_WRONG_INDEX, "Wrong index given to function");
SETMSG(HA_ERR_CRASHED, ER_DEFAULT(ER_NOT_KEYFILE));
SETMSG(HA_ERR_WRONG_IN_RECORD, ER_DEFAULT(ER_CRASHED_ON_USAGE));
SETMSG(HA_ERR_OUT_OF_MEM, "Table handler out of memory");
SETMSG(HA_ERR_NOT_A_TABLE, "Incorrect file format '%.64s'");
SETMSG(HA_ERR_WRONG_COMMAND, "Command not supported");
SETMSG(HA_ERR_OLD_FILE, ER_DEFAULT(ER_OLD_KEYFILE));
SETMSG(HA_ERR_NO_ACTIVE_RECORD, "No record read in update");
SETMSG(HA_ERR_RECORD_DELETED, "Intern record deleted");
SETMSG(HA_ERR_RECORD_FILE_FULL, ER_DEFAULT(ER_RECORD_FILE_FULL));
SETMSG(HA_ERR_INDEX_FILE_FULL, "No more room in index file '%.64s'");
SETMSG(HA_ERR_END_OF_FILE, "End in next/prev/first/last");
SETMSG(HA_ERR_UNSUPPORTED, ER_DEFAULT(ER_ILLEGAL_HA));
SETMSG(HA_ERR_TO_BIG_ROW, "Too big row");
SETMSG(HA_WRONG_CREATE_OPTION, "Wrong create option");
SETMSG(HA_ERR_FOUND_DUPP_UNIQUE, ER_DEFAULT(ER_DUP_UNIQUE));
SETMSG(HA_ERR_UNKNOWN_CHARSET, "Can't open charset");
SETMSG(HA_ERR_WRONG_MRG_TABLE_DEF, ER_DEFAULT(ER_WRONG_MRG_TABLE));
SETMSG(HA_ERR_CRASHED_ON_REPAIR, ER_DEFAULT(ER_CRASHED_ON_REPAIR));
SETMSG(HA_ERR_CRASHED_ON_USAGE, ER_DEFAULT(ER_CRASHED_ON_USAGE));
SETMSG(HA_ERR_LOCK_WAIT_TIMEOUT, ER_DEFAULT(ER_LOCK_WAIT_TIMEOUT));
SETMSG(HA_ERR_LOCK_TABLE_FULL, ER_DEFAULT(ER_LOCK_TABLE_FULL));
SETMSG(HA_ERR_READ_ONLY_TRANSACTION, ER_DEFAULT(ER_READ_ONLY_TRANSACTION));
SETMSG(HA_ERR_LOCK_DEADLOCK, ER_DEFAULT(ER_LOCK_DEADLOCK));
SETMSG(HA_ERR_CANNOT_ADD_FOREIGN, ER_DEFAULT(ER_CANNOT_ADD_FOREIGN));
SETMSG(HA_ERR_NO_REFERENCED_ROW, ER_DEFAULT(ER_NO_REFERENCED_ROW_2));
SETMSG(HA_ERR_ROW_IS_REFERENCED, ER_DEFAULT(ER_ROW_IS_REFERENCED_2));
SETMSG(HA_ERR_NO_SAVEPOINT, "No savepoint with that name");
SETMSG(HA_ERR_NON_UNIQUE_BLOCK_SIZE, "Non unique key block size");
SETMSG(HA_ERR_NO_SUCH_TABLE, "No such table: '%.64s'");
SETMSG(HA_ERR_TABLE_EXIST, ER_DEFAULT(ER_TABLE_EXISTS_ERROR));
SETMSG(HA_ERR_NO_CONNECTION, "Could not connect to storage engine");
SETMSG(HA_ERR_TABLE_DEF_CHANGED, ER_DEFAULT(ER_TABLE_DEF_CHANGED));
SETMSG(HA_ERR_FOREIGN_DUPLICATE_KEY, "FK constraint would lead to duplicate key");
SETMSG(HA_ERR_TABLE_NEEDS_UPGRADE, ER_DEFAULT(ER_TABLE_NEEDS_UPGRADE));
SETMSG(HA_ERR_TABLE_READONLY, ER_DEFAULT(ER_OPEN_AS_READONLY));
SETMSG(HA_ERR_AUTOINC_READ_FAILED, ER_DEFAULT(ER_AUTOINC_READ_FAILED));
SETMSG(HA_ERR_AUTOINC_ERANGE, ER_DEFAULT(ER_WARN_DATA_OUT_OF_RANGE));
SETMSG(HA_ERR_TOO_MANY_CONCURRENT_TRXS, ER_DEFAULT(ER_TOO_MANY_CONCURRENT_TRXS));
SETMSG(HA_ERR_INDEX_COL_TOO_LONG, ER_DEFAULT(ER_INDEX_COLUMN_TOO_LONG));
SETMSG(HA_ERR_INDEX_CORRUPT, ER_DEFAULT(ER_INDEX_CORRUPT));
SETMSG(HA_FTS_INVALID_DOCID, "Invalid InnoDB FTS Doc ID");
SETMSG(HA_ERR_DISK_FULL, ER_DEFAULT(ER_DISK_FULL));
SETMSG(HA_ERR_FTS_TOO_MANY_WORDS_IN_PHRASE, "Too many words in a FTS phrase or proximity search");
SETMSG(HA_ERR_FK_DEPTH_EXCEEDED, "Foreign key cascade delete/update exceeds");
SETMSG(HA_ERR_TABLESPACE_MISSING, ER_DEFAULT(ER_TABLESPACE_MISSING));
/* Register the error messages for use with my_error(). */
return my_error_register(get_handler_errmsgs, HA_ERR_FIRST, HA_ERR_LAST);
}
/**
Unregister handler error messages.
@retval
0 OK
@retval
!=0 Error
*/
static int ha_finish_errors(void)
{
/* Allocate a pointer array for the error message strings. */
my_error_unregister(HA_ERR_FIRST, HA_ERR_LAST);
my_free(handler_errmsgs);
handler_errmsgs= 0;
return 0;
}
static Atomic_counter<int32> need_full_discover_for_existence(0);
static Atomic_counter<int32> engines_with_discover_file_names(0);
static Atomic_counter<int32> engines_with_discover(0);
static int full_discover_for_existence(handlerton *, const char *, const char *)
{ return 0; }
static int ext_based_existence(handlerton *, const char *, const char *)
{ return 0; }
static int hton_ext_based_table_discovery(handlerton *hton, LEX_CSTRING *db,
MY_DIR *dir, handlerton::discovered_list *result)
{
/*
tablefile_extensions[0] is the metadata file, see
the comment above tablefile_extensions declaration
*/
return extension_based_table_discovery(dir, hton->tablefile_extensions[0],
result);
}
static void update_discovery_counters(handlerton *hton, int val)
{
if (hton->discover_table_existence == full_discover_for_existence)
need_full_discover_for_existence+= val;
if (hton->discover_table_names && hton->tablefile_extensions[0])
engines_with_discover_file_names+= val;
if (hton->discover_table)
engines_with_discover+= val;
}
int ha_drop_table(THD *thd, handlerton *hton, const char *path)
{
if (ha_check_if_updates_are_ignored(thd, hton, "DROP"))
return 0; // Simulate dropped
return hton->drop_table(hton, path);
}
static int hton_drop_table(handlerton *hton, const char *path)
{
char tmp_path[FN_REFLEN];
handler *file= get_new_handler(nullptr, current_thd->mem_root, hton);
if (!file)
{
/*
If file is not defined it means that the engine can't create a
handler if share is not set or we got an out of memory error
*/
return my_errno == ENOMEM ? ENOMEM : ENOENT;
}
path= get_canonical_filename(file, path, tmp_path);
int error= file->delete_table(path);
delete file;
return error;
}
int ha_finalize_handlerton(st_plugin_int *plugin)
{
int deinit_status= 0;
handlerton *hton= (handlerton *)plugin->data;
DBUG_ENTER("ha_finalize_handlerton");
/* hton can be NULL here, if ha_initialize_handlerton() failed. */
if (!hton)
goto end;
if (installed_htons[hton->db_type] == hton)
installed_htons[hton->db_type]= NULL;
if (hton->panic)
hton->panic(hton, HA_PANIC_CLOSE);
if (plugin->plugin->deinit)
deinit_status= plugin->plugin->deinit(NULL);
free_sysvar_table_options(hton);
update_discovery_counters(hton, -1);
/*
In case a plugin is uninstalled and re-installed later, it should
reuse an array slot. Otherwise the number of uninstall/install
cycles would be limited.
*/
if (hton->slot != HA_SLOT_UNDEF)
{
/* Make sure we are not unpluging another plugin */
DBUG_ASSERT(hton2plugin[hton->slot] == plugin);
DBUG_ASSERT(hton->slot < MAX_HA);
hton2plugin[hton->slot]= NULL;
}
my_free(hton);
end:
DBUG_RETURN(deinit_status);
}
/*
Get a pointer to the global engine optimizer costs (like
innodb.disk_read_cost) and store the pointer in the handlerton.
This is called once when a handlerton is created.
We also update the not set global costs with the default costs
to allow information_schema to print the real used values.
*/
static bool update_optimizer_costs(handlerton *hton)
{
OPTIMIZER_COSTS costs= default_optimizer_costs;
LEX_CSTRING *name= hton_name(hton);
if (hton->update_optimizer_costs)
hton->update_optimizer_costs(&costs);
mysql_mutex_lock(&LOCK_optimizer_costs);
hton->optimizer_costs= get_or_create_optimizer_costs(name->str,
name->length);
if (!hton->optimizer_costs)
{
mysql_mutex_unlock(&LOCK_optimizer_costs);
return 1; // OOM
}
/* Update not set values from current default costs */
for (uint i=0 ; i < sizeof(OPTIMIZER_COSTS)/sizeof(double) ; i++)
{
double *var= ((double*) hton->optimizer_costs)+i;
if (*var == OPTIMIZER_COST_UNDEF)
*var= ((double*) &costs)[i];
}
mysql_mutex_unlock(&LOCK_optimizer_costs);
return 0;
}
const char *hton_no_exts[]= { 0 };
static bool ddl_recovery_done= false;
int ha_initialize_handlerton(st_plugin_int *plugin)
{
handlerton *hton;
int ret= 0;
DBUG_ENTER("ha_initialize_handlerton");
DBUG_PRINT("plugin", ("initialize plugin: '%s'", plugin->name.str));
hton= (handlerton *)my_malloc(key_memory_handlerton, sizeof(handlerton),
MYF(MY_WME | MY_ZEROFILL));
if (hton == NULL)
{
sql_print_error("Unable to allocate memory for plugin '%s' handlerton.",
plugin->name.str);
ret= 1;
goto err_no_hton_memory;
}
hton->tablefile_extensions= hton_no_exts;
hton->discover_table_names= hton_ext_based_table_discovery;
hton->drop_table= hton_drop_table;
hton->slot= HA_SLOT_UNDEF;
/* Historical Requirement */
plugin->data= hton; // shortcut for the future
/* [remove after merge] notes on merge conflict (MDEV-31400):
10.6-10.11: 13ba00ff4933cfc1712676f323587504e453d1b5
11.0-11.2: 42f8be10f18163c4025710cf6a212e82bddb2f62
The 10.11->11.0 conflict is trivial, but the reference commit also
contains different non-conflict changes needs to be applied to 11.0
(and beyond).
*/
if (plugin->plugin->init && (ret= plugin->plugin->init(hton)))
goto err;
// hton_ext_based_table_discovery() works only when discovery
// is supported and the engine if file-based.
if (hton->discover_table_names == hton_ext_based_table_discovery &&
(!hton->discover_table || !hton->tablefile_extensions[0]))
hton->discover_table_names= NULL;
// default discover_table_existence implementation
if (!hton->discover_table_existence && hton->discover_table)
{
if (hton->tablefile_extensions[0])
hton->discover_table_existence= ext_based_existence;
else
hton->discover_table_existence= full_discover_for_existence;
}
uint tmp;
ulong fslot;
DBUG_EXECUTE_IF("unstable_db_type", {
static int i= (int) DB_TYPE_FIRST_DYNAMIC;
hton->db_type= (enum legacy_db_type)++i;
});
/* now check the db_type for conflict */
if (hton->db_type <= DB_TYPE_UNKNOWN ||
hton->db_type >= DB_TYPE_DEFAULT ||
installed_htons[hton->db_type])
{
int idx= (int) DB_TYPE_FIRST_DYNAMIC;
while (idx < (int) DB_TYPE_DEFAULT && installed_htons[idx])
idx++;
if (idx == (int) DB_TYPE_DEFAULT)
{
sql_print_warning("Too many storage engines!");
ret= 1;
goto err_deinit;
}
if (hton->db_type != DB_TYPE_UNKNOWN)
sql_print_warning("Storage engine '%s' has conflicting typecode. "
"Assigning value %d.", plugin->plugin->name, idx);
hton->db_type= (enum legacy_db_type) idx;
}
/*
In case a plugin is uninstalled and re-installed later, it should
reuse an array slot. Otherwise the number of uninstall/install
cycles would be limited. So look for a free slot.
*/
DBUG_PRINT("plugin", ("total_ha: %lu", total_ha));
for (fslot= 0; fslot < total_ha; fslot++)
{
if (!hton2plugin[fslot])
break;
}
if (fslot < total_ha)
hton->slot= fslot;
else
{
if (total_ha >= MAX_HA)
{
sql_print_error("Too many plugins loaded. Limit is %lu. "
"Failed on '%s'", (ulong) MAX_HA, plugin->name.str);
ret= 1;
goto err_deinit;
}
hton->slot= total_ha++;
}
installed_htons[hton->db_type]= hton;
tmp= hton->savepoint_offset;
hton->savepoint_offset= savepoint_alloc_size;
savepoint_alloc_size+= tmp;
hton2plugin[hton->slot]=plugin;
if (!(hton->flags & HTON_HIDDEN) && update_optimizer_costs(hton))
goto err_deinit;
if (hton->prepare)
{
total_ha_2pc++;
if (tc_log && tc_log != get_tc_log_implementation())
{
total_ha_2pc--;
hton->prepare= 0;
push_warning_printf(current_thd, Sql_condition::WARN_LEVEL_WARN,
ER_UNKNOWN_ERROR,
"Cannot enable tc-log at run-time. "
"XA features of %s are disabled",
plugin->name.str);
}
}
/*
This is entirely for legacy. We will create a new "disk based" hton and a
"memory" hton which will be configurable longterm. We should be able to
remove partition.
*/
switch (hton->db_type) {
case DB_TYPE_HEAP:
heap_hton= hton;
break;
case DB_TYPE_MYISAM:
myisam_hton= hton;
break;
case DB_TYPE_PARTITION_DB:
partition_hton= hton;
break;
case DB_TYPE_SEQUENCE:
sql_sequence_hton= hton;
break;
default:
break;
};
resolve_sysvar_table_options(hton);
update_discovery_counters(hton, 1);
if (ddl_recovery_done && hton->signal_ddl_recovery_done)
hton->signal_ddl_recovery_done(hton);
DBUG_RETURN(ret);
err_deinit:
/*
Let plugin do its inner deinitialization as plugin->init()
was successfully called before.
*/
if (plugin->plugin->deinit)
(void) plugin->plugin->deinit(NULL);
err:
#ifdef DBUG_ASSERT_EXISTS
if (hton->prepare)
failed_ha_2pc++;
#endif
my_free(hton);
err_no_hton_memory:
plugin->data= NULL;
DBUG_RETURN(ret);
}
int ha_init()
{
int error= 0;
DBUG_ENTER("ha_init");
DBUG_ASSERT(total_ha < MAX_HA);
/*
Check if there is a transaction-capable storage engine besides the
binary log (which is considered a transaction-capable storage engine in
counting total_ha)
*/
opt_using_transactions= total_ha > (ulong) opt_bin_log;
savepoint_alloc_size+= sizeof(SAVEPOINT);
DBUG_RETURN(error);
}
int ha_end()
{
int error= 0;
DBUG_ENTER("ha_end");
/*
This should be eventually based on the graceful shutdown flag.
So if flag is equal to HA_PANIC_CLOSE, the deallocate
the errors.
*/
if (unlikely(ha_finish_errors()))
error= 1;
DBUG_RETURN(error);
}
static my_bool dropdb_handlerton(THD *unused1, plugin_ref plugin,
void *path)
{
handlerton *hton= plugin_hton(plugin);
if (hton->drop_database)
hton->drop_database(hton, (char *)path);
return FALSE;
}
void ha_drop_database(const char* path)
{
plugin_foreach(NULL, dropdb_handlerton, MYSQL_STORAGE_ENGINE_PLUGIN,
(char*) path);
}
static my_bool checkpoint_state_handlerton(THD *unused1, plugin_ref plugin,
void *disable)
{
handlerton *hton= plugin_hton(plugin);
if (hton->checkpoint_state)
hton->checkpoint_state(hton, (int) *(bool*) disable);
return FALSE;
}
void ha_checkpoint_state(bool disable)
{
plugin_foreach(NULL, checkpoint_state_handlerton, MYSQL_STORAGE_ENGINE_PLUGIN, &disable);
}
struct st_commit_checkpoint_request {
void *cookie;
void (*pre_hook)(void *);
};
static my_bool commit_checkpoint_request_handlerton(THD *unused1, plugin_ref plugin,
void *data)
{
st_commit_checkpoint_request *st= (st_commit_checkpoint_request *)data;
handlerton *hton= plugin_hton(plugin);
if (hton->commit_checkpoint_request)
{
void *cookie= st->cookie;
if (st->pre_hook)
(*st->pre_hook)(cookie);
(*hton->commit_checkpoint_request)(cookie);
}
return FALSE;
}
/*
Invoke commit_checkpoint_request() in all storage engines that implement it.
If pre_hook is non-NULL, the hook will be called prior to each invocation.
*/
void
ha_commit_checkpoint_request(void *cookie, void (*pre_hook)(void *))
{
st_commit_checkpoint_request st;
st.cookie= cookie;
st.pre_hook= pre_hook;
plugin_foreach(NULL, commit_checkpoint_request_handlerton,
MYSQL_STORAGE_ENGINE_PLUGIN, &st);
}
/**
@note
don't bother to rollback here, it's done already
there's no need to rollback here as all transactions must
be rolled back already
*/
void ha_close_connection(THD* thd)
{
for (auto i= 0; i < MAX_HA; i++)
{
if (plugin_ref plugin= thd->ha_data[i].lock)
{
thd->ha_data[i].lock= NULL;
handlerton *hton= plugin_hton(plugin);
if (hton->close_connection)
hton->close_connection(hton, thd);
thd_set_ha_data(thd, hton, 0);
plugin_unlock(NULL, plugin);
}
DBUG_ASSERT(!thd->ha_data[i].ha_ptr);
}
}
static my_bool kill_handlerton(THD *thd, plugin_ref plugin,
void *level)
{
handlerton *hton= plugin_hton(plugin);
mysql_mutex_assert_owner(&thd->LOCK_thd_data);
if (hton->kill_query && thd_get_ha_data(thd, hton))
hton->kill_query(hton, thd, *(enum thd_kill_levels *) level);
return FALSE;
}
void ha_kill_query(THD* thd, enum thd_kill_levels level)
{
DBUG_ENTER("ha_kill_query");
plugin_foreach(thd, kill_handlerton, MYSQL_STORAGE_ENGINE_PLUGIN, &level);
DBUG_VOID_RETURN;
}
static my_bool plugin_disable_internal_writes(THD *, plugin_ref plugin,
void *disable)
{
if (void(*diw)(bool)= plugin_hton(plugin)->disable_internal_writes)
diw(*static_cast<bool*>(disable));
return FALSE;
}
void ha_disable_internal_writes(bool disable)
{
plugin_foreach(NULL, plugin_disable_internal_writes,
MYSQL_STORAGE_ENGINE_PLUGIN, &disable);
}
static my_bool signal_ddl_recovery_done(THD *, plugin_ref plugin, void *)