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sql_table.cc
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sql_table.cc
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/*
Copyright (c) 2000, 2023, Oracle and/or its affiliates.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License, version 2.0,
as published by the Free Software Foundation.
This program is also distributed with certain software (including
but not limited to OpenSSL) that is licensed under separate terms,
as designated in a particular file or component or in included license
documentation. The authors of MySQL hereby grant you an additional
permission to link the program and your derivative works with the
separately licensed software that they have included with MySQL.
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, version 2.0, 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 St, Fifth Floor, Boston, MA 02110-1301 USA
*/
/* drop and alter of tables */
#include "sql_table.h"
#include "auth_common.h" // check_fk_parent_table_access
#include "unireg.h"
#include "debug_sync.h"
#include "sql_rename.h" // do_rename
#include "sql_parse.h" // test_if_data_home_dir
#include "sql_cache.h" // query_cache_*
#include "sql_base.h" // open_table_uncached, lock_table_names
#include "lock.h" // mysql_unlock_tables
#include "strfunc.h" // find_type2, find_set
#include "sql_view.h" // view_checksum
#include "sql_truncate.h" // regenerate_locked_table
#include "sql_partition.h" // mem_alloc_error,
// generate_partition_syntax,
// NOT_A_PARTITION_ID
#include "partition_info.h" // partition_info
#include "sql_db.h" // load_db_opt_by_name
#include "sql_time.h" // make_truncated_value_warning
#include "records.h" // init_read_record, end_read_record
#include "filesort.h" // filesort_free_buffers
#include "sql_select.h" // setup_order,
// make_unireg_sortorder
#include "sql_handler.h" // mysql_ha_rm_tables
#include "discover.h" // readfrm
#include "log_event.h" // Query_log_event
#include <hash.h>
#include <myisam.h>
#include <my_dir.h>
#include "sp_head.h"
#include "sp.h"
#include "sql_parse.h"
#include "sql_show.h"
#include "transaction.h"
#include "datadict.h" // dd_frm_type()
#include "sql_resolver.h" // setup_order
#include "table_cache.h"
#include "sql_trigger.h" // change_trigger_table_name
#include <mysql/psi/mysql_table.h>
#include "partitioning/partition_handler.h" // Partition_handler
#include "log.h"
#include "binlog.h"
#include "sql_tablespace.h" // check_tablespace_name())
#include "item_timefunc.h" // Item_func_now_local
#include "pfs_file_provider.h"
#include "mysql/psi/mysql_file.h"
#include <algorithm>
using std::max;
using std::min;
using binary_log::checksum_crc32;
#define ER_THD_OR_DEFAULT(thd,X) ((thd) ? ER_THD(thd, X) : ER_DEFAULT(X))
const char *primary_key_name="PRIMARY";
static bool check_if_keyname_exists(const char *name,KEY *start, KEY *end);
static char *make_unique_key_name(const char *field_name,KEY *start,KEY *end);
static int copy_data_between_tables(PSI_stage_progress *psi,
TABLE *from,TABLE *to,
List<Create_field> &create,
ha_rows *copied,ha_rows *deleted,
Alter_info::enum_enable_or_disable keys_onoff,
Alter_table_ctx *alter_ctx);
static bool prepare_blob_field(THD *thd, Create_field *sql_field);
static void sp_prepare_create_field(THD *thd, Create_field *sql_field);
static bool check_engine(THD *thd, const char *db_name,
const char *table_name,
HA_CREATE_INFO *create_info);
static int
mysql_prepare_create_table(THD *thd, const char *error_schema_name,
const char *error_table_name,
HA_CREATE_INFO *create_info,
Alter_info *alter_info,
bool tmp_table,
uint *db_options,
handler *file, KEY **key_info_buffer,
uint *key_count, int select_field_count);
static uint blob_length_by_type(enum_field_types type);
/**
@brief Helper function for explain_filename
@param thd Thread handle
@param to_p Explained name in system_charset_info
@param end_p End of the to_p buffer
@param name Name to be converted
@param name_len Length of the name, in bytes
*/
static char* add_identifier(THD* thd, char *to_p, const char * end_p,
const char* name, size_t name_len)
{
size_t res;
uint errors;
const char *conv_name;
char tmp_name[FN_REFLEN];
char conv_string[FN_REFLEN];
int quote;
DBUG_ENTER("add_identifier");
if (!name[name_len])
conv_name= name;
else
{
my_stpnmov(tmp_name, name, name_len);
tmp_name[name_len]= 0;
conv_name= tmp_name;
}
res= strconvert(&my_charset_filename, conv_name, system_charset_info,
conv_string, FN_REFLEN, &errors);
if (!res || errors)
{
DBUG_PRINT("error", ("strconvert of '%s' failed with %u (errors: %u)", conv_name,
static_cast<uint>(res), errors));
conv_name= name;
}
else
{
DBUG_PRINT("info", ("conv '%s' -> '%s'", conv_name, conv_string));
conv_name= conv_string;
}
quote = thd ? get_quote_char_for_identifier(thd, conv_name, res - 1) : '`';
if (quote != EOF && (end_p - to_p > 2))
{
*(to_p++)= (char) quote;
while (*conv_name && (end_p - to_p - 1) > 0)
{
uint length= my_mbcharlen(system_charset_info, *conv_name);
if (!length)
length= 1;
if (length == 1 && *conv_name == (char) quote)
{
if ((end_p - to_p) < 3)
break;
*(to_p++)= (char) quote;
*(to_p++)= *(conv_name++);
}
else if (((long) length) < (end_p - to_p))
{
to_p= my_stpnmov(to_p, conv_name, length);
conv_name+= length;
}
else
break; /* string already filled */
}
if (end_p > to_p) {
*(to_p++)= (char) quote;
if (end_p > to_p)
*to_p= 0; /* terminate by NUL, but do not include it in the count */
}
}
else
to_p= my_stpnmov(to_p, conv_name, end_p - to_p);
DBUG_RETURN(to_p);
}
/**
@brief Explain a path name by split it to database, table etc.
@details Break down the path name to its logic parts
(database, table, partition, subpartition).
filename_to_tablename cannot be used on partitions, due to the #P# part.
There can be up to 6 '#', #P# for partition, #SP# for subpartition
and #TMP# or #REN# for temporary or renamed partitions.
This should be used when something should be presented to a user in a
diagnostic, error etc. when it would be useful to know what a particular
file [and directory] means. Such as SHOW ENGINE STATUS, error messages etc.
@param thd Thread handle
@param from Path name in my_charset_filename
Null terminated in my_charset_filename, normalized
to use '/' as directory separation character.
@param to Explained name in system_charset_info
@param to_length Size of to buffer
@param explain_mode Requested output format.
EXPLAIN_ALL_VERBOSE ->
[Database `db`, ]Table `tbl`[,[ Temporary| Renamed]
Partition `p` [, Subpartition `sp`]]
EXPLAIN_PARTITIONS_VERBOSE -> `db`.`tbl`
[[ Temporary| Renamed] Partition `p`
[, Subpartition `sp`]]
EXPLAIN_PARTITIONS_AS_COMMENT -> `db`.`tbl` |*
[,[ Temporary| Renamed] Partition `p`
[, Subpartition `sp`]] *|
(| is really a /, and it is all in one line)
@retval Length of returned string
*/
size_t explain_filename(THD* thd,
const char *from,
char *to,
size_t to_length,
enum_explain_filename_mode explain_mode)
{
char *to_p= to;
char *end_p= to_p + to_length;
const char *db_name= NULL;
size_t db_name_len= 0;
const char *table_name;
size_t table_name_len= 0;
const char *part_name= NULL;
size_t part_name_len= 0;
const char *subpart_name= NULL;
size_t subpart_name_len= 0;
enum enum_part_name_type {NORMAL, TEMP, RENAMED} part_type= NORMAL;
const char *tmp_p;
DBUG_ENTER("explain_filename");
DBUG_PRINT("enter", ("from '%s'", from));
tmp_p= from;
table_name= from;
/*
If '/' then take last directory part as database.
'/' is the directory separator, not FN_LIB_CHAR
*/
while ((tmp_p= strchr(tmp_p, '/')))
{
db_name= table_name;
/* calculate the length */
db_name_len= tmp_p - db_name;
tmp_p++;
table_name= tmp_p;
}
tmp_p= table_name;
/* Look if there are partition tokens in the table name. */
while ((tmp_p= strchr(tmp_p, '#')))
{
tmp_p++;
switch (tmp_p[0]) {
case 'P':
case 'p':
if (tmp_p[1] == '#')
{
part_name= tmp_p + 2;
tmp_p+= 2;
}
break;
case 'S':
case 's':
if ((tmp_p[1] == 'P' || tmp_p[1] == 'p') && tmp_p[2] == '#')
{
part_name_len= tmp_p - part_name - 1;
subpart_name= tmp_p + 3;
tmp_p+= 3;
}
break;
case 'T':
case 't':
if ((tmp_p[1] == 'M' || tmp_p[1] == 'm') &&
(tmp_p[2] == 'P' || tmp_p[2] == 'p') &&
tmp_p[3] == '#' && !tmp_p[4])
{
part_type= TEMP;
tmp_p+= 4;
}
break;
case 'R':
case 'r':
if ((tmp_p[1] == 'E' || tmp_p[1] == 'e') &&
(tmp_p[2] == 'N' || tmp_p[2] == 'n') &&
tmp_p[3] == '#' && !tmp_p[4])
{
part_type= RENAMED;
tmp_p+= 4;
}
break;
default:
/* Not partition name part. */
;
}
}
if (part_name)
{
table_name_len= part_name - table_name - 3;
if (subpart_name)
subpart_name_len= strlen(subpart_name);
else
part_name_len= strlen(part_name);
if (part_type != NORMAL)
{
if (subpart_name)
subpart_name_len-= 5;
else
part_name_len-= 5;
}
}
else
table_name_len= strlen(table_name);
if (db_name)
{
if (explain_mode == EXPLAIN_ALL_VERBOSE)
{
to_p= my_stpncpy(to_p, ER_THD_OR_DEFAULT(thd, ER_DATABASE_NAME),
end_p - to_p);
*(to_p++)= ' ';
to_p= add_identifier(thd, to_p, end_p, db_name, db_name_len);
to_p= my_stpncpy(to_p, ", ", end_p - to_p);
}
else
{
to_p= add_identifier(thd, to_p, end_p, db_name, db_name_len);
to_p= my_stpncpy(to_p, ".", end_p - to_p);
}
}
if (explain_mode == EXPLAIN_ALL_VERBOSE)
{
to_p= my_stpncpy(to_p, ER_THD_OR_DEFAULT(thd, ER_TABLE_NAME), end_p - to_p);
*(to_p++)= ' ';
to_p= add_identifier(thd, to_p, end_p, table_name, table_name_len);
}
else
to_p= add_identifier(thd, to_p, end_p, table_name, table_name_len);
if (part_name)
{
if (explain_mode == EXPLAIN_PARTITIONS_AS_COMMENT)
to_p= my_stpncpy(to_p, " /* ", end_p - to_p);
else if (explain_mode == EXPLAIN_PARTITIONS_VERBOSE)
to_p= my_stpncpy(to_p, " ", end_p - to_p);
else
to_p= my_stpncpy(to_p, ", ", end_p - to_p);
if (part_type != NORMAL)
{
if (part_type == TEMP)
to_p= my_stpncpy(to_p, ER_THD_OR_DEFAULT(thd, ER_TEMPORARY_NAME),
end_p - to_p);
else
to_p= my_stpncpy(to_p, ER_THD_OR_DEFAULT(thd, ER_RENAMED_NAME),
end_p - to_p);
to_p= my_stpncpy(to_p, " ", end_p - to_p);
}
to_p= my_stpncpy(to_p, ER_THD_OR_DEFAULT(thd, ER_PARTITION_NAME),
end_p - to_p);
*(to_p++)= ' ';
to_p= add_identifier(thd, to_p, end_p, part_name, part_name_len);
if (subpart_name)
{
to_p= my_stpncpy(to_p, ", ", end_p - to_p);
to_p= my_stpncpy(to_p, ER_THD_OR_DEFAULT(thd, ER_SUBPARTITION_NAME),
end_p - to_p);
*(to_p++)= ' ';
to_p= add_identifier(thd, to_p, end_p, subpart_name, subpart_name_len);
}
if (explain_mode == EXPLAIN_PARTITIONS_AS_COMMENT)
to_p= my_stpncpy(to_p, " */", end_p - to_p);
}
DBUG_PRINT("exit", ("to '%s'", to));
DBUG_RETURN(static_cast<size_t>(to_p - to));
}
/*
Translate a file name to a table name (WL #1324).
SYNOPSIS
filename_to_tablename()
from The file name in my_charset_filename.
to OUT The table name in system_charset_info.
to_length The size of the table name buffer.
RETURN
Table name length.
*/
size_t filename_to_tablename(const char *from, char *to, size_t to_length
#ifndef NDEBUG
, bool stay_quiet
#endif /* NDEBUG */
)
{
uint errors;
size_t res;
DBUG_ENTER("filename_to_tablename");
DBUG_PRINT("enter", ("from '%s'", from));
if (strlen(from) >= tmp_file_prefix_length &&
!memcmp(from, tmp_file_prefix, tmp_file_prefix_length))
{
/* Temporary table name. */
res= (my_stpnmov(to, from, to_length) - to);
}
else
{
res= strconvert(&my_charset_filename, from,
system_charset_info, to, to_length, &errors);
if (errors) // Old 5.0 name
{
res= (strxnmov(to, to_length, MYSQL50_TABLE_NAME_PREFIX, from, NullS) -
to);
#ifndef NDEBUG
if (!stay_quiet) {
#endif /* NDEBUG */
sql_print_error("Invalid (old?) table or database name '%s'", from);
#ifndef NDEBUG
}
#endif /* NDEBUG */
/*
TODO: add a stored procedure for fix table and database names,
and mention its name in error log.
*/
}
}
DBUG_PRINT("exit", ("to '%s'", to));
DBUG_RETURN(res);
}
/**
Check if given string begins with "#mysql50#" prefix
@param name string to check cut
@retval
FALSE no prefix found
@retval
TRUE prefix found
*/
bool check_mysql50_prefix(const char *name)
{
return (name[0] == '#' &&
!strncmp(name, MYSQL50_TABLE_NAME_PREFIX,
MYSQL50_TABLE_NAME_PREFIX_LENGTH));
}
/**
Check if given string begins with "#mysql50#" prefix, cut it if so.
@param from string to check and cut
@param to[out] buffer for result string
@param to_length its size
@retval
0 no prefix found
@retval
non-0 result string length
*/
size_t check_n_cut_mysql50_prefix(const char *from, char *to, size_t to_length)
{
if (check_mysql50_prefix(from))
return static_cast<size_t>(strmake(to, from + MYSQL50_TABLE_NAME_PREFIX_LENGTH,
to_length - 1) - to);
return 0;
}
/*
Translate a table name to a file name (WL #1324).
SYNOPSIS
tablename_to_filename()
from The table name in system_charset_info.
to OUT The file name in my_charset_filename.
to_length The size of the file name buffer.
RETURN
File name length.
*/
size_t tablename_to_filename(const char *from, char *to, size_t to_length)
{
uint errors;
size_t length;
DBUG_ENTER("tablename_to_filename");
DBUG_PRINT("enter", ("from '%s'", from));
if ((length= check_n_cut_mysql50_prefix(from, to, to_length)))
{
/*
Check if the name supplied is a valid mysql 5.0 name and
make the name a zero length string if it's not.
Note that just returning zero length is not enough :
a lot of places don't check the return value and expect
a zero terminated string.
*/
if (check_table_name(to, length, TRUE) != IDENT_NAME_OK)
{
to[0]= 0;
length= 0;
}
DBUG_RETURN(length);
}
length= strconvert(system_charset_info, from,
&my_charset_filename, to, to_length, &errors);
if (check_if_legal_tablename(to) &&
length + 4 < to_length)
{
memcpy(to + length, "@@@", 4);
length+= 3;
}
DBUG_PRINT("exit", ("to '%s'", to));
DBUG_RETURN(length);
}
/*
@brief Creates path to a file: mysql_data_dir/db/table.ext
@param buff Where to write result in my_charset_filename.
This may be the same as table_name.
@param bufflen buff size
@param db Database name in system_charset_info.
@param table_name Table name in system_charset_info.
@param ext File extension.
@param flags FN_FROM_IS_TMP or FN_TO_IS_TMP or FN_IS_TMP
table_name is temporary, do not change.
@param was_truncated points to location that will be
set to true if path was truncated,
to false otherwise.
@note
Uses database and table name, and extension to create
a file name in mysql_data_dir. Database and table
names are converted from system_charset_info into "fscs".
Unless flags indicate a temporary table name.
'db' is always converted.
'ext' is not converted.
The conversion suppression is required for ALTER TABLE. This
statement creates intermediate tables. These are regular
(non-temporary) tables with a temporary name. Their path names must
be derivable from the table name. So we cannot use
build_tmptable_filename() for them.
@return
path length
*/
size_t build_table_filename(char *buff, size_t bufflen, const char *db,
const char *table_name, const char *ext,
uint flags, bool *was_truncated)
{
char tbbuff[FN_REFLEN], dbbuff[FN_REFLEN];
size_t tab_len, db_len;
DBUG_ENTER("build_table_filename");
DBUG_PRINT("enter", ("db: '%s' table_name: '%s' ext: '%s' flags: %x",
db, table_name, ext, flags));
if (flags & FN_IS_TMP) // FN_FROM_IS_TMP | FN_TO_IS_TMP
tab_len= my_stpnmov(tbbuff, table_name, sizeof(tbbuff)) - tbbuff;
else
tab_len= tablename_to_filename(table_name, tbbuff, sizeof(tbbuff));
db_len= tablename_to_filename(db, dbbuff, sizeof(dbbuff));
char *end = buff + bufflen;
/* Don't add FN_ROOTDIR if mysql_data_home already includes it */
char *pos = my_stpnmov(buff, mysql_data_home, bufflen);
size_t rootdir_len= strlen(FN_ROOTDIR);
if (pos - rootdir_len >= buff &&
memcmp(pos - rootdir_len, FN_ROOTDIR, rootdir_len) != 0)
pos= my_stpnmov(pos, FN_ROOTDIR, end - pos);
else
rootdir_len= 0;
pos= strxnmov(pos, end - pos, dbbuff, FN_ROOTDIR, NullS);
pos= strxnmov(pos, end - pos, tbbuff, ext, NullS);
/**
Mark OUT param if path gets truncated.
Most of functions which invoke this function are sure that the
path will not be truncated. In case some functions are not sure,
we can use 'was_truncated' OUTPARAM
*/
*was_truncated= false;
if (pos == end &&
(bufflen < mysql_data_home_len + rootdir_len + db_len +
strlen(FN_ROOTDIR) + tab_len + strlen(ext)))
*was_truncated= true;
DBUG_PRINT("exit", ("buff: '%s'", buff));
DBUG_RETURN(pos - buff);
}
/**
Create path to a temporary table mysql_tmpdir/#sql1234_12_1
(i.e. to its .FRM file but without an extension).
@param thd The thread handle.
@param buff Where to write result in my_charset_filename.
@param bufflen buff size
@note
Uses current_pid, thread_id, and tmp_table counter to create
a file name in mysql_tmpdir.
@return Path length.
*/
size_t build_tmptable_filename(THD* thd, char *buff, size_t bufflen)
{
DBUG_ENTER("build_tmptable_filename");
char *p= my_stpnmov(buff, mysql_tmpdir, bufflen);
assert(sizeof(my_thread_id) == 4);
my_snprintf(p, bufflen - (p - buff), "/%s%lx_%lx_%x",
tmp_file_prefix, current_pid,
thd->thread_id(), thd->tmp_table++);
if (lower_case_table_names)
{
/* Convert all except tmpdir to lower case */
my_casedn_str(files_charset_info, p);
}
size_t length= unpack_filename(buff, buff);
DBUG_PRINT("exit", ("buff: '%s'", buff));
DBUG_RETURN(length);
}
/*
--------------------------------------------------------------------------
MODULE: DDL log
-----------------
This module is used to ensure that we can recover from crashes that occur
in the middle of a meta-data operation in MySQL. E.g. DROP TABLE t1, t2;
We need to ensure that both t1 and t2 are dropped and not only t1 and
also that each table drop is entirely done and not "half-baked".
To support this we create log entries for each meta-data statement in the
ddl log while we are executing. These entries are dropped when the
operation is completed.
At recovery those entries that were not completed will be executed.
There is only one ddl log in the system and it is protected by a mutex
and there is a global struct that contains information about its current
state.
History:
First version written in 2006 by Mikael Ronstrom
--------------------------------------------------------------------------
*/
struct st_global_ddl_log
{
/*
We need to adjust buffer size to be able to handle downgrades/upgrades
where IO_SIZE has changed. We'll set the buffer size such that we can
handle that the buffer size was upto 4 times bigger in the version
that wrote the DDL log.
*/
char file_entry_buf[4*IO_SIZE];
char file_name_str[FN_REFLEN];
char *file_name;
DDL_LOG_MEMORY_ENTRY *first_free;
DDL_LOG_MEMORY_ENTRY *first_used;
uint num_entries;
File file_id;
uint name_len;
uint io_size;
bool inited;
bool do_release;
bool recovery_phase;
st_global_ddl_log() : inited(false), do_release(false) {}
};
st_global_ddl_log global_ddl_log;
mysql_mutex_t LOCK_gdl;
#define DDL_LOG_ENTRY_TYPE_POS 0
#define DDL_LOG_ACTION_TYPE_POS 1
#define DDL_LOG_PHASE_POS 2
#define DDL_LOG_NEXT_ENTRY_POS 4
#define DDL_LOG_NAME_POS 8
#define DDL_LOG_NUM_ENTRY_POS 0
#define DDL_LOG_NAME_LEN_POS 4
#define DDL_LOG_IO_SIZE_POS 8
/**
Read one entry from ddl log file.
@param entry_no Entry number to read
@return Operation status
@retval true Error
@retval false Success
*/
static bool read_ddl_log_file_entry(uint entry_no)
{
bool error= FALSE;
File file_id= global_ddl_log.file_id;
uchar *file_entry_buf= (uchar*)global_ddl_log.file_entry_buf;
uint io_size= global_ddl_log.io_size;
DBUG_ENTER("read_ddl_log_file_entry");
mysql_mutex_assert_owner(&LOCK_gdl);
if (mysql_file_pread(file_id, file_entry_buf, io_size, io_size * entry_no,
MYF(MY_WME)) != io_size)
error= TRUE;
DBUG_RETURN(error);
}
/**
Write one entry to ddl log file.
@param entry_no Entry number to write
@return Operation status
@retval true Error
@retval false Success
*/
static bool write_ddl_log_file_entry(uint entry_no)
{
bool error= FALSE;
File file_id= global_ddl_log.file_id;
uchar *file_entry_buf= (uchar*)global_ddl_log.file_entry_buf;
DBUG_ENTER("write_ddl_log_file_entry");
mysql_mutex_assert_owner(&LOCK_gdl);
if (mysql_file_pwrite(file_id, file_entry_buf,
IO_SIZE, IO_SIZE * entry_no, MYF(MY_WME)) != IO_SIZE)
error= TRUE;
DBUG_RETURN(error);
}
/**
Sync the ddl log file.
@return Operation status
@retval FALSE Success
@retval TRUE Error
*/
static bool sync_ddl_log_file()
{
DBUG_ENTER("sync_ddl_log_file");
DBUG_RETURN(mysql_file_sync(global_ddl_log.file_id, MYF(MY_WME)));
}
/**
Write ddl log header.
@return Operation status
@retval TRUE Error
@retval FALSE Success
*/
static bool write_ddl_log_header()
{
uint16 const_var;
DBUG_ENTER("write_ddl_log_header");
int4store(&global_ddl_log.file_entry_buf[DDL_LOG_NUM_ENTRY_POS],
global_ddl_log.num_entries);
const_var= FN_REFLEN;
int4store(&global_ddl_log.file_entry_buf[DDL_LOG_NAME_LEN_POS],
(ulong) const_var);
const_var= IO_SIZE;
int4store(&global_ddl_log.file_entry_buf[DDL_LOG_IO_SIZE_POS],
(ulong) const_var);
if (write_ddl_log_file_entry(0UL))
{
sql_print_error("Error writing ddl log header");
DBUG_RETURN(TRUE);
}
DBUG_RETURN(sync_ddl_log_file());
}
/**
Create ddl log file name.
@param file_name Filename setup
*/
static inline void create_ddl_log_file_name(char *file_name)
{
strxmov(file_name, mysql_data_home, "/", "ddl_log.log", NullS);
}
/**
Read header of ddl log file.
When we read the ddl log header we get information about maximum sizes
of names in the ddl log and we also get information about the number
of entries in the ddl log.
@return Last entry in ddl log (0 if no entries)
*/
static uint read_ddl_log_header()
{
uchar *file_entry_buf= (uchar*)global_ddl_log.file_entry_buf;
char file_name[FN_REFLEN];
uint entry_no;
bool successful_open= FALSE;
DBUG_ENTER("read_ddl_log_header");
mysql_mutex_init(key_LOCK_gdl, &LOCK_gdl, MY_MUTEX_INIT_SLOW);
mysql_mutex_lock(&LOCK_gdl);
create_ddl_log_file_name(file_name);
if ((global_ddl_log.file_id= mysql_file_open(key_file_global_ddl_log,
file_name,
O_RDWR | O_BINARY, MYF(0))) >= 0)
{
if (read_ddl_log_file_entry(0UL))
{
/* Write message into error log */
sql_print_error("Failed to read ddl log file in recovery");
}
else
successful_open= TRUE;
}
if (successful_open)
{
entry_no= uint4korr(&file_entry_buf[DDL_LOG_NUM_ENTRY_POS]);
global_ddl_log.name_len= uint4korr(&file_entry_buf[DDL_LOG_NAME_LEN_POS]);
global_ddl_log.io_size= uint4korr(&file_entry_buf[DDL_LOG_IO_SIZE_POS]);
assert(global_ddl_log.io_size <=
sizeof(global_ddl_log.file_entry_buf));
}
else
{
entry_no= 0;
}
global_ddl_log.first_free= NULL;
global_ddl_log.first_used= NULL;
global_ddl_log.num_entries= 0;
global_ddl_log.do_release= true;
mysql_mutex_unlock(&LOCK_gdl);
DBUG_RETURN(entry_no);
}
/**
Convert from ddl_log_entry struct to file_entry_buf binary blob.
@param ddl_log_entry filled in ddl_log_entry struct.
*/
static void set_global_from_ddl_log_entry(const DDL_LOG_ENTRY *ddl_log_entry)
{
mysql_mutex_assert_owner(&LOCK_gdl);
global_ddl_log.file_entry_buf[DDL_LOG_ENTRY_TYPE_POS]=
(char)DDL_LOG_ENTRY_CODE;
global_ddl_log.file_entry_buf[DDL_LOG_ACTION_TYPE_POS]=
(char)ddl_log_entry->action_type;
global_ddl_log.file_entry_buf[DDL_LOG_PHASE_POS]= 0;
int4store(&global_ddl_log.file_entry_buf[DDL_LOG_NEXT_ENTRY_POS],
ddl_log_entry->next_entry);
assert(strlen(ddl_log_entry->name) < FN_REFLEN);
strmake(&global_ddl_log.file_entry_buf[DDL_LOG_NAME_POS],
ddl_log_entry->name, FN_REFLEN - 1);
if (ddl_log_entry->action_type == DDL_LOG_RENAME_ACTION ||
ddl_log_entry->action_type == DDL_LOG_REPLACE_ACTION ||
ddl_log_entry->action_type == DDL_LOG_EXCHANGE_ACTION)
{
assert(strlen(ddl_log_entry->from_name) < FN_REFLEN);
strmake(&global_ddl_log.file_entry_buf[DDL_LOG_NAME_POS + FN_REFLEN],
ddl_log_entry->from_name, FN_REFLEN - 1);
}
else
global_ddl_log.file_entry_buf[DDL_LOG_NAME_POS + FN_REFLEN]= 0;
assert(strlen(ddl_log_entry->handler_name) < FN_REFLEN);
strmake(&global_ddl_log.file_entry_buf[DDL_LOG_NAME_POS + (2*FN_REFLEN)],
ddl_log_entry->handler_name, FN_REFLEN - 1);
if (ddl_log_entry->action_type == DDL_LOG_EXCHANGE_ACTION)
{
assert(strlen(ddl_log_entry->tmp_name) < FN_REFLEN);
strmake(&global_ddl_log.file_entry_buf[DDL_LOG_NAME_POS + (3*FN_REFLEN)],
ddl_log_entry->tmp_name, FN_REFLEN - 1);
}
else
global_ddl_log.file_entry_buf[DDL_LOG_NAME_POS + (3*FN_REFLEN)]= 0;
}
/**
Convert from file_entry_buf binary blob to ddl_log_entry struct.
@param[out] ddl_log_entry struct to fill in.
@note Strings (names) are pointing to the global_ddl_log structure,
so LOCK_gdl needs to be hold until they are read or copied.
*/
static void set_ddl_log_entry_from_global(DDL_LOG_ENTRY *ddl_log_entry,
const uint read_entry)
{
char *file_entry_buf= (char*) global_ddl_log.file_entry_buf;
uint inx;
uchar single_char;
mysql_mutex_assert_owner(&LOCK_gdl);
ddl_log_entry->entry_pos= read_entry;
single_char= file_entry_buf[DDL_LOG_ENTRY_TYPE_POS];
ddl_log_entry->entry_type= (enum ddl_log_entry_code)single_char;
single_char= file_entry_buf[DDL_LOG_ACTION_TYPE_POS];
ddl_log_entry->action_type= (enum ddl_log_action_code)single_char;
ddl_log_entry->phase= file_entry_buf[DDL_LOG_PHASE_POS];
ddl_log_entry->next_entry= uint4korr(&file_entry_buf[DDL_LOG_NEXT_ENTRY_POS]);
ddl_log_entry->name= &file_entry_buf[DDL_LOG_NAME_POS];
inx= DDL_LOG_NAME_POS + global_ddl_log.name_len;
ddl_log_entry->from_name= &file_entry_buf[inx];
inx+= global_ddl_log.name_len;
ddl_log_entry->handler_name= &file_entry_buf[inx];
if (ddl_log_entry->action_type == DDL_LOG_EXCHANGE_ACTION)
{
inx+= global_ddl_log.name_len;
ddl_log_entry->tmp_name= &file_entry_buf[inx];
}
else
ddl_log_entry->tmp_name= NULL;
}
/**
Read a ddl log entry.
Read a specified entry in the ddl log.
@param read_entry Number of entry to read
@param[out] entry_info Information from entry
@return Operation status
@retval TRUE Error
@retval FALSE Success
*/
static bool read_ddl_log_entry(uint read_entry, DDL_LOG_ENTRY *ddl_log_entry)
{
DBUG_ENTER("read_ddl_log_entry");
if (read_ddl_log_file_entry(read_entry))
{
DBUG_RETURN(TRUE);
}
set_ddl_log_entry_from_global(ddl_log_entry, read_entry);
DBUG_RETURN(FALSE);
}
/**
Initialise ddl log.
Write the header of the ddl log file and length of names. Also set
number of entries to zero.
@return Operation status
@retval TRUE Error
@retval FALSE Success
*/
static bool init_ddl_log()
{
char file_name[FN_REFLEN];
DBUG_ENTER("init_ddl_log");
if (global_ddl_log.inited)
goto end;
global_ddl_log.io_size= IO_SIZE;
global_ddl_log.name_len= FN_REFLEN;
create_ddl_log_file_name(file_name);
if ((global_ddl_log.file_id= mysql_file_create(key_file_global_ddl_log,