/
ha_myisam.cc
2659 lines (2321 loc) · 83.8 KB
/
ha_myisam.cc
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/*
Copyright (c) 2000, 2012, Oracle and/or its affiliates.
Copyright (c) 2009, 2017, 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 St, Fifth Floor, Boston, MA 02110-1301 USA */
#ifdef USE_PRAGMA_IMPLEMENTATION
#pragma implementation // gcc: Class implementation
#endif
#define MYSQL_SERVER 1
#include "sql_plugin.h"
#include "sql_priv.h"
#include "key.h" // key_copy
#include <m_ctype.h>
#include <my_bit.h>
#include "ha_myisam.h"
#include "myisamdef.h"
#include "rt_index.h"
#include "sql_table.h" // tablename_to_filename
#include "sql_class.h" // THD
#include "debug_sync.h"
ulonglong myisam_recover_options;
static ulong opt_myisam_block_size;
/* bits in myisam_recover_options */
const char *myisam_recover_names[] =
{ "DEFAULT", "BACKUP", "FORCE", "QUICK", "BACKUP_ALL", "OFF", NullS};
TYPELIB myisam_recover_typelib= {array_elements(myisam_recover_names)-1,"",
myisam_recover_names, NULL};
const char *myisam_stats_method_names[] = {"NULLS_UNEQUAL", "NULLS_EQUAL",
"NULLS_IGNORED", NullS};
TYPELIB myisam_stats_method_typelib= {
array_elements(myisam_stats_method_names) - 1, "",
myisam_stats_method_names, NULL};
static MYSQL_SYSVAR_ULONG(block_size, opt_myisam_block_size,
PLUGIN_VAR_READONLY | PLUGIN_VAR_RQCMDARG,
"Block size to be used for MyISAM index pages", NULL, NULL,
MI_KEY_BLOCK_LENGTH, MI_MIN_KEY_BLOCK_LENGTH, MI_MAX_KEY_BLOCK_LENGTH,
MI_MIN_KEY_BLOCK_LENGTH);
static MYSQL_SYSVAR_ULONG(data_pointer_size, myisam_data_pointer_size,
PLUGIN_VAR_RQCMDARG, "Default pointer size to be used for MyISAM tables",
NULL, NULL, 6, 2, 7, 1);
#define MB (1024*1024)
static MYSQL_SYSVAR_ULONGLONG(max_sort_file_size, myisam_max_temp_length,
PLUGIN_VAR_RQCMDARG, "Don't use the fast sort index method to created "
"index if the temporary file would get bigger than this", NULL, NULL,
LONG_MAX/MB*MB, 0, MAX_FILE_SIZE, MB);
static MYSQL_SYSVAR_SET(recover_options, myisam_recover_options,
PLUGIN_VAR_OPCMDARG|PLUGIN_VAR_READONLY,
"Specifies how corrupted tables should be automatically repaired",
NULL, NULL, HA_RECOVER_BACKUP|HA_RECOVER_QUICK, &myisam_recover_typelib);
static MYSQL_THDVAR_ULONG(repair_threads, PLUGIN_VAR_RQCMDARG,
"If larger than 1, when repairing a MyISAM table all indexes will be "
"created in parallel, with one thread per index. The value of 1 "
"disables parallel repair", NULL, NULL,
1, 1, ULONG_MAX, 1);
static MYSQL_THDVAR_ULONGLONG(sort_buffer_size, PLUGIN_VAR_RQCMDARG,
"The buffer that is allocated when sorting the index when doing "
"a REPAIR or when creating indexes with CREATE INDEX or ALTER TABLE", NULL, NULL,
SORT_BUFFER_INIT, MIN_SORT_BUFFER, SIZE_T_MAX, 1);
static MYSQL_SYSVAR_BOOL(use_mmap, opt_myisam_use_mmap, PLUGIN_VAR_NOCMDARG,
"Use memory mapping for reading and writing MyISAM tables", NULL, NULL, FALSE);
static MYSQL_SYSVAR_ULONGLONG(mmap_size, myisam_mmap_size,
PLUGIN_VAR_RQCMDARG|PLUGIN_VAR_READONLY, "Restricts the total memory "
"used for memory mapping of MySQL tables", NULL, NULL,
SIZE_T_MAX, MEMMAP_EXTRA_MARGIN, SIZE_T_MAX, 1);
static MYSQL_THDVAR_ENUM(stats_method, PLUGIN_VAR_RQCMDARG,
"Specifies how MyISAM index statistics collection code should "
"treat NULLs. Possible values of name are NULLS_UNEQUAL (default "
"behavior for 4.1 and later), NULLS_EQUAL (emulate 4.0 behavior), "
"and NULLS_IGNORED", NULL, NULL,
MI_STATS_METHOD_NULLS_NOT_EQUAL, &myisam_stats_method_typelib);
#ifndef DBUG_OFF
/**
Causes the thread to wait in a spin lock for a query kill signal.
This function is used by the test frame work to identify race conditions.
The signal is caught and ignored and the thread is not killed.
*/
static void debug_wait_for_kill(const char *info)
{
DBUG_ENTER("debug_wait_for_kill");
const char *prev_info;
THD *thd;
thd= current_thd;
prev_info= thd_proc_info(thd, info);
while(!thd->killed)
my_sleep(1000);
DBUG_PRINT("info", ("Exit debug_wait_for_kill"));
thd_proc_info(thd, prev_info);
DBUG_VOID_RETURN;
}
#endif
/*****************************************************************************
** MyISAM tables
*****************************************************************************/
static handler *myisam_create_handler(handlerton *hton,
TABLE_SHARE *table,
MEM_ROOT *mem_root)
{
return new (mem_root) ha_myisam(hton, table);
}
// collect errors printed by mi_check routines
static void mi_check_print_msg(HA_CHECK *param, const char* msg_type,
const char *fmt, va_list args)
{
THD* thd = (THD*)param->thd;
Protocol *protocol= thd->protocol;
size_t length, msg_length;
char msgbuf[MYSQL_ERRMSG_SIZE];
char name[NAME_LEN*2+2];
if (param->testflag & T_SUPPRESS_ERR_HANDLING)
return;
msg_length= my_vsnprintf(msgbuf, sizeof(msgbuf), fmt, args);
msgbuf[sizeof(msgbuf) - 1] = 0; // healthy paranoia
DBUG_PRINT(msg_type,("message: %s",msgbuf));
if (!thd->vio_ok())
{
sql_print_error("%s.%s: %s", param->db_name, param->table_name, msgbuf);
return;
}
if (param->testflag & (T_CREATE_MISSING_KEYS | T_SAFE_REPAIR |
T_AUTO_REPAIR))
{
my_message(ER_NOT_KEYFILE, msgbuf, MYF(MY_WME));
if (thd->variables.log_warnings > 2 && ! thd->log_all_errors)
sql_print_error("%s.%s: %s", param->db_name, param->table_name, msgbuf);
return;
}
length=(uint) (strxmov(name, param->db_name,".",param->table_name,NullS) -
name);
/*
TODO: switch from protocol to push_warning here. The main reason we didn't
it yet is parallel repair, which threads have no THD object accessible via
current_thd.
Also we likely need to lock mutex here (in both cases with protocol and
push_warning).
*/
if (param->need_print_msg_lock)
mysql_mutex_lock(¶m->print_msg_mutex);
protocol->prepare_for_resend();
protocol->store(name, length, system_charset_info);
protocol->store(param->op_name, system_charset_info);
protocol->store(msg_type, system_charset_info);
protocol->store(msgbuf, msg_length, system_charset_info);
if (protocol->write())
sql_print_error("Failed on my_net_write, writing to stderr instead: %s\n",
msgbuf);
else if (thd->variables.log_warnings > 2)
sql_print_error("%s.%s: %s", param->db_name, param->table_name, msgbuf);
if (param->need_print_msg_lock)
mysql_mutex_unlock(¶m->print_msg_mutex);
return;
}
/*
Convert TABLE object to MyISAM key and column definition
SYNOPSIS
table2myisam()
table_arg in TABLE object.
keydef_out out MyISAM key definition.
recinfo_out out MyISAM column definition.
records_out out Number of fields.
DESCRIPTION
This function will allocate and initialize MyISAM key and column
definition for further use in mi_create or for a check for underlying
table conformance in merge engine.
The caller needs to free *recinfo_out after use. Since *recinfo_out
and *keydef_out are allocated with a my_multi_malloc, *keydef_out
is freed automatically when *recinfo_out is freed.
RETURN VALUE
0 OK
!0 error code
*/
int table2myisam(TABLE *table_arg, MI_KEYDEF **keydef_out,
MI_COLUMNDEF **recinfo_out, uint *records_out)
{
uint i, j, recpos, minpos, fieldpos, temp_length, length;
enum ha_base_keytype type= HA_KEYTYPE_BINARY;
uchar *record;
KEY *pos;
MI_KEYDEF *keydef;
MI_COLUMNDEF *recinfo, *recinfo_pos;
HA_KEYSEG *keyseg;
TABLE_SHARE *share= table_arg->s;
uint options= share->db_options_in_use;
DBUG_ENTER("table2myisam");
if (!(my_multi_malloc(MYF(MY_WME),
recinfo_out, (share->fields * 2 + 2) * sizeof(MI_COLUMNDEF),
keydef_out, share->keys * sizeof(MI_KEYDEF),
&keyseg,
(share->key_parts + share->keys) * sizeof(HA_KEYSEG),
NullS)))
DBUG_RETURN(HA_ERR_OUT_OF_MEM); /* purecov: inspected */
keydef= *keydef_out;
recinfo= *recinfo_out;
pos= table_arg->key_info;
for (i= 0; i < share->keys; i++, pos++)
{
keydef[i].flag= ((uint16) pos->flags & (HA_NOSAME | HA_FULLTEXT | HA_SPATIAL));
keydef[i].key_alg= pos->algorithm == HA_KEY_ALG_UNDEF ?
(pos->flags & HA_SPATIAL ? HA_KEY_ALG_RTREE : HA_KEY_ALG_BTREE) :
pos->algorithm;
keydef[i].block_length= pos->block_size;
keydef[i].seg= keyseg;
keydef[i].keysegs= pos->user_defined_key_parts;
for (j= 0; j < pos->user_defined_key_parts; j++)
{
Field *field= pos->key_part[j].field;
type= field->key_type();
keydef[i].seg[j].flag= pos->key_part[j].key_part_flag;
if (options & HA_OPTION_PACK_KEYS ||
(pos->flags & (HA_PACK_KEY | HA_BINARY_PACK_KEY |
HA_SPACE_PACK_USED)))
{
if (pos->key_part[j].length > 8 &&
(type == HA_KEYTYPE_TEXT ||
type == HA_KEYTYPE_NUM ||
(type == HA_KEYTYPE_BINARY && !field->zero_pack())))
{
/* No blobs here */
if (j == 0)
keydef[i].flag|= HA_PACK_KEY;
if (!(field->flags & ZEROFILL_FLAG) &&
(field->type() == MYSQL_TYPE_STRING ||
field->type() == MYSQL_TYPE_VAR_STRING ||
((int) (pos->key_part[j].length - field->decimals())) >= 4))
keydef[i].seg[j].flag|= HA_SPACE_PACK;
}
else if (j == 0 && (!(pos->flags & HA_NOSAME) || pos->key_length > 16))
keydef[i].flag|= HA_BINARY_PACK_KEY;
}
keydef[i].seg[j].type= (int) type;
keydef[i].seg[j].start= pos->key_part[j].offset;
keydef[i].seg[j].length= pos->key_part[j].length;
keydef[i].seg[j].bit_start= keydef[i].seg[j].bit_length= 0;
keydef[i].seg[j].bit_pos= 0;
keydef[i].seg[j].language= field->charset_for_protocol()->number;
if (field->null_ptr)
{
keydef[i].seg[j].null_bit= field->null_bit;
keydef[i].seg[j].null_pos= (uint) (field->null_ptr-
(uchar*) table_arg->record[0]);
}
else
{
keydef[i].seg[j].null_bit= 0;
keydef[i].seg[j].null_pos= 0;
}
if (field->type() == MYSQL_TYPE_BLOB ||
field->type() == MYSQL_TYPE_GEOMETRY)
{
keydef[i].seg[j].flag|= HA_BLOB_PART;
/* save number of bytes used to pack length */
keydef[i].seg[j].bit_start= (uint) (field->pack_length() -
portable_sizeof_char_ptr);
}
else if (field->type() == MYSQL_TYPE_BIT)
{
keydef[i].seg[j].bit_length= ((Field_bit *) field)->bit_len;
keydef[i].seg[j].bit_start= ((Field_bit *) field)->bit_ofs;
keydef[i].seg[j].bit_pos= (uint) (((Field_bit *) field)->bit_ptr -
(uchar*) table_arg->record[0]);
}
}
keyseg+= pos->user_defined_key_parts;
}
if (table_arg->found_next_number_field)
keydef[share->next_number_index].flag|= HA_AUTO_KEY;
record= table_arg->record[0];
recpos= 0;
recinfo_pos= recinfo;
while (recpos < (uint) share->stored_rec_length)
{
Field **field, *found= 0;
minpos= share->reclength;
length= 0;
for (field= table_arg->field; *field; field++)
{
if ((fieldpos= (*field)->offset(record)) >= recpos &&
fieldpos <= minpos)
{
/* skip null fields */
if (!(temp_length= (*field)->pack_length_in_rec()))
continue; /* Skip null-fields */
if (! found || fieldpos < minpos ||
(fieldpos == minpos && temp_length < length))
{
minpos= fieldpos;
found= *field;
length= temp_length;
}
}
}
DBUG_PRINT("loop", ("found: 0x%lx recpos: %d minpos: %d length: %d",
(long) found, recpos, minpos, length));
if (recpos != minpos)
{
/* reserve space for null bits */
bzero((char*) recinfo_pos, sizeof(*recinfo_pos));
recinfo_pos->type= FIELD_NORMAL;
recinfo_pos++->length= (uint16) (minpos - recpos);
}
if (!found)
break;
if (found->flags & BLOB_FLAG)
recinfo_pos->type= FIELD_BLOB;
else if (found->real_type() == MYSQL_TYPE_TIMESTAMP)
{
/* pre-MySQL-5.6.4 TIMESTAMP, or MariaDB-5.3+ TIMESTAMP */
recinfo_pos->type= FIELD_NORMAL;
}
else if (found->type() == MYSQL_TYPE_VARCHAR)
recinfo_pos->type= FIELD_VARCHAR;
else if (!(options & HA_OPTION_PACK_RECORD))
recinfo_pos->type= FIELD_NORMAL;
else if (found->real_type() == MYSQL_TYPE_TIMESTAMP2)
{
/*
MySQL-5.6.4+ erroneously marks Field_timestampf as FIELD_SKIP_PRESPACE,
but only if HA_OPTION_PACK_RECORD is set.
*/
recinfo_pos->type= FIELD_SKIP_PRESPACE;
}
else if (found->zero_pack())
recinfo_pos->type= FIELD_SKIP_ZERO;
else
recinfo_pos->type= ((length <= 3 ||
(found->flags & ZEROFILL_FLAG)) ?
FIELD_NORMAL :
found->type() == MYSQL_TYPE_STRING ||
found->type() == MYSQL_TYPE_VAR_STRING ?
FIELD_SKIP_ENDSPACE :
FIELD_SKIP_PRESPACE);
if (found->null_ptr)
{
recinfo_pos->null_bit= found->null_bit;
recinfo_pos->null_pos= (uint) (found->null_ptr -
(uchar*) table_arg->record[0]);
}
else
{
recinfo_pos->null_bit= 0;
recinfo_pos->null_pos= 0;
}
(recinfo_pos++)->length= (uint16) length;
recpos= minpos + length;
DBUG_PRINT("loop", ("length: %d type: %d",
recinfo_pos[-1].length,recinfo_pos[-1].type));
}
*records_out= (uint) (recinfo_pos - recinfo);
DBUG_RETURN(0);
}
/*
Check for underlying table conformance
SYNOPSIS
myisam_check_definition()
t1_keyinfo in First table key definition
t1_recinfo in First table record definition
t1_keys in Number of keys in first table
t1_recs in Number of records in first table
t2_keyinfo in Second table key definition
t2_recinfo in Second table record definition
t2_keys in Number of keys in second table
t2_recs in Number of records in second table
strict in Strict check switch
table in handle to the table object
DESCRIPTION
This function compares two MyISAM definitions. By intention it was done
to compare merge table definition against underlying table definition.
It may also be used to compare dot-frm and MYI definitions of MyISAM
table as well to compare different MyISAM table definitions.
For merge table it is not required that number of keys in merge table
must exactly match number of keys in underlying table. When calling this
function for underlying table conformance check, 'strict' flag must be
set to false, and converted merge definition must be passed as t1_*.
Otherwise 'strict' flag must be set to 1 and it is not required to pass
converted dot-frm definition as t1_*.
For compatibility reasons we relax some checks, specifically:
- 4.0 (and earlier versions) always set key_alg to 0.
- 4.0 (and earlier versions) have the same language for all keysegs.
RETURN VALUE
0 - Equal definitions.
1 - Different definitions.
TODO
- compare FULLTEXT keys;
- compare SPATIAL keys;
- compare FIELD_SKIP_ZERO which is converted to FIELD_NORMAL correctly
(should be corretly detected in table2myisam).
*/
int check_definition(MI_KEYDEF *t1_keyinfo, MI_COLUMNDEF *t1_recinfo,
uint t1_keys, uint t1_recs,
MI_KEYDEF *t2_keyinfo, MI_COLUMNDEF *t2_recinfo,
uint t2_keys, uint t2_recs, bool strict, TABLE *table_arg)
{
uint i, j;
DBUG_ENTER("check_definition");
my_bool mysql_40_compat= table_arg && table_arg->s->frm_version < FRM_VER_TRUE_VARCHAR;
if ((strict ? t1_keys != t2_keys : t1_keys > t2_keys))
{
DBUG_PRINT("error", ("Number of keys differs: t1_keys=%u, t2_keys=%u",
t1_keys, t2_keys));
DBUG_RETURN(1);
}
if (t1_recs != t2_recs)
{
DBUG_PRINT("error", ("Number of recs differs: t1_recs=%u, t2_recs=%u",
t1_recs, t2_recs));
DBUG_RETURN(1);
}
for (i= 0; i < t1_keys; i++)
{
HA_KEYSEG *t1_keysegs= t1_keyinfo[i].seg;
HA_KEYSEG *t2_keysegs= t2_keyinfo[i].seg;
if (t1_keyinfo[i].flag & HA_FULLTEXT && t2_keyinfo[i].flag & HA_FULLTEXT)
continue;
else if (t1_keyinfo[i].flag & HA_FULLTEXT ||
t2_keyinfo[i].flag & HA_FULLTEXT)
{
DBUG_PRINT("error", ("Key %d has different definition", i));
DBUG_PRINT("error", ("t1_fulltext= %d, t2_fulltext=%d",
MY_TEST(t1_keyinfo[i].flag & HA_FULLTEXT),
MY_TEST(t2_keyinfo[i].flag & HA_FULLTEXT)));
DBUG_RETURN(1);
}
if (t1_keyinfo[i].flag & HA_SPATIAL && t2_keyinfo[i].flag & HA_SPATIAL)
continue;
else if (t1_keyinfo[i].flag & HA_SPATIAL ||
t2_keyinfo[i].flag & HA_SPATIAL)
{
DBUG_PRINT("error", ("Key %d has different definition", i));
DBUG_PRINT("error", ("t1_spatial= %d, t2_spatial=%d",
MY_TEST(t1_keyinfo[i].flag & HA_SPATIAL),
MY_TEST(t2_keyinfo[i].flag & HA_SPATIAL)));
DBUG_RETURN(1);
}
if ((!mysql_40_compat &&
t1_keyinfo[i].key_alg != t2_keyinfo[i].key_alg) ||
t1_keyinfo[i].keysegs != t2_keyinfo[i].keysegs)
{
DBUG_PRINT("error", ("Key %d has different definition", i));
DBUG_PRINT("error", ("t1_keysegs=%d, t1_key_alg=%d",
t1_keyinfo[i].keysegs, t1_keyinfo[i].key_alg));
DBUG_PRINT("error", ("t2_keysegs=%d, t2_key_alg=%d",
t2_keyinfo[i].keysegs, t2_keyinfo[i].key_alg));
DBUG_RETURN(1);
}
for (j= t1_keyinfo[i].keysegs; j--;)
{
uint8 t1_keysegs_j__type= t1_keysegs[j].type;
/*
Table migration from 4.1 to 5.1. In 5.1 a *TEXT key part is
always HA_KEYTYPE_VARTEXT2. In 4.1 we had only the equivalent of
HA_KEYTYPE_VARTEXT1. Since we treat both the same on MyISAM
level, we can ignore a mismatch between these types.
*/
if ((t1_keysegs[j].flag & HA_BLOB_PART) &&
(t2_keysegs[j].flag & HA_BLOB_PART))
{
if ((t1_keysegs_j__type == HA_KEYTYPE_VARTEXT2) &&
(t2_keysegs[j].type == HA_KEYTYPE_VARTEXT1))
t1_keysegs_j__type= HA_KEYTYPE_VARTEXT1; /* purecov: tested */
else if ((t1_keysegs_j__type == HA_KEYTYPE_VARBINARY2) &&
(t2_keysegs[j].type == HA_KEYTYPE_VARBINARY1))
t1_keysegs_j__type= HA_KEYTYPE_VARBINARY1; /* purecov: inspected */
}
if ((!mysql_40_compat &&
t1_keysegs[j].language != t2_keysegs[j].language) ||
t1_keysegs_j__type != t2_keysegs[j].type ||
t1_keysegs[j].null_bit != t2_keysegs[j].null_bit ||
t1_keysegs[j].length != t2_keysegs[j].length ||
t1_keysegs[j].start != t2_keysegs[j].start)
{
DBUG_PRINT("error", ("Key segment %d (key %d) has different "
"definition", j, i));
DBUG_PRINT("error", ("t1_type=%d, t1_language=%d, t1_null_bit=%d, "
"t1_length=%d",
t1_keysegs[j].type, t1_keysegs[j].language,
t1_keysegs[j].null_bit, t1_keysegs[j].length));
DBUG_PRINT("error", ("t2_type=%d, t2_language=%d, t2_null_bit=%d, "
"t2_length=%d",
t2_keysegs[j].type, t2_keysegs[j].language,
t2_keysegs[j].null_bit, t2_keysegs[j].length));
DBUG_RETURN(1);
}
}
}
for (i= 0; i < t1_recs; i++)
{
MI_COLUMNDEF *t1_rec= &t1_recinfo[i];
MI_COLUMNDEF *t2_rec= &t2_recinfo[i];
/*
FIELD_SKIP_ZERO can be changed to FIELD_NORMAL in mi_create,
see NOTE1 in mi_create.c
*/
if ((t1_rec->type != t2_rec->type &&
!(t1_rec->type == (int) FIELD_SKIP_ZERO &&
t1_rec->length == 1 &&
t2_rec->type == (int) FIELD_NORMAL)) ||
t1_rec->length != t2_rec->length ||
t1_rec->null_bit != t2_rec->null_bit)
{
DBUG_PRINT("error", ("Field %d has different definition", i));
DBUG_PRINT("error", ("t1_type=%d, t1_length=%d, t1_null_bit=%d",
t1_rec->type, t1_rec->length, t1_rec->null_bit));
DBUG_PRINT("error", ("t2_type=%d, t2_length=%d, t2_null_bit=%d",
t2_rec->type, t2_rec->length, t2_rec->null_bit));
DBUG_RETURN(1);
}
}
DBUG_RETURN(0);
}
extern "C" {
int killed_ptr(HA_CHECK *param)
{
if (likely(thd_killed((THD*)param->thd)) == 0)
return 0;
my_errno= HA_ERR_ABORTED_BY_USER;
return 1;
}
void mi_check_print_error(HA_CHECK *param, const char *fmt,...)
{
param->error_printed|=1;
param->out_flag|= O_DATA_LOST;
if (param->testflag & T_SUPPRESS_ERR_HANDLING)
return;
va_list args;
va_start(args, fmt);
mi_check_print_msg(param, "error", fmt, args);
va_end(args);
}
void mi_check_print_info(HA_CHECK *param, const char *fmt,...)
{
va_list args;
va_start(args, fmt);
mi_check_print_msg(param, "info", fmt, args);
param->note_printed= 1;
va_end(args);
}
void mi_check_print_warning(HA_CHECK *param, const char *fmt,...)
{
param->warning_printed=1;
param->out_flag|= O_DATA_LOST;
va_list args;
va_start(args, fmt);
mi_check_print_msg(param, "warning", fmt, args);
va_end(args);
}
/**
Report list of threads (and queries) accessing a table, thread_id of a
thread that detected corruption, ource file name and line number where
this corruption was detected, optional extra information (string).
This function is intended to be used when table corruption is detected.
@param[in] file MI_INFO object.
@param[in] message Optional error message.
@param[in] sfile Name of source file.
@param[in] sline Line number in source file.
@return void
*/
void _mi_report_crashed(MI_INFO *file, const char *message,
const char *sfile, uint sline)
{
THD *cur_thd;
LIST *element;
char buf[1024];
mysql_mutex_lock(&file->s->intern_lock);
if ((cur_thd= (THD*) file->in_use.data))
sql_print_error("Got an error from thread_id=%lld, %s:%d", cur_thd->thread_id,
sfile, sline);
else
sql_print_error("Got an error from unknown thread, %s:%d", sfile, sline);
if (message)
sql_print_error("%s", message);
for (element= file->s->in_use; element; element= list_rest(element))
{
THD *thd= (THD*) element->data;
sql_print_error("%s",
thd ?
thd_get_error_context_description(thd, buf, sizeof(buf), 0)
: "Unknown thread accessing table");
}
mysql_mutex_unlock(&file->s->intern_lock);
}
/* Return 1 if user have requested query to be killed */
my_bool mi_killed_in_mariadb(MI_INFO *info)
{
return (((TABLE*) (info->external_ref))->in_use->killed != 0);
}
static int compute_vcols(MI_INFO *info, uchar *record, int keynum)
{
TABLE *table= (TABLE*)(info->external_ref);
table->move_fields(table->field, record, table->field[0]->record_ptr());
if (keynum == -1) // update all vcols
{
int error= table->update_virtual_fields(table->file, VCOL_UPDATE_FOR_READ);
if (table->update_virtual_fields(table->file, VCOL_UPDATE_INDEXED))
error= 1;
return error;
}
// update only one key
KEY *key= table->key_info + keynum;
KEY_PART_INFO *kp= key->key_part, *end= kp + key->ext_key_parts;
for (; kp < end; kp++)
{
Field *f= table->field[kp->fieldnr - 1];
if (f->vcol_info)
table->update_virtual_field(f);
}
return 0;
}
}
ha_myisam::ha_myisam(handlerton *hton, TABLE_SHARE *table_arg)
:handler(hton, table_arg), file(0),
int_table_flags(HA_NULL_IN_KEY | HA_CAN_FULLTEXT | HA_CAN_SQL_HANDLER |
HA_BINLOG_ROW_CAPABLE | HA_BINLOG_STMT_CAPABLE |
HA_CAN_VIRTUAL_COLUMNS | HA_CAN_EXPORT |
HA_REQUIRES_KEY_COLUMNS_FOR_DELETE |
HA_DUPLICATE_POS | HA_CAN_INDEX_BLOBS | HA_AUTO_PART_KEY |
HA_FILE_BASED | HA_CAN_GEOMETRY | HA_NO_TRANSACTIONS |
HA_CAN_INSERT_DELAYED | HA_CAN_BIT_FIELD | HA_CAN_RTREEKEYS |
HA_HAS_RECORDS | HA_STATS_RECORDS_IS_EXACT | HA_CAN_REPAIR),
can_enable_indexes(1)
{}
handler *ha_myisam::clone(const char *name, MEM_ROOT *mem_root)
{
ha_myisam *new_handler= static_cast <ha_myisam *>(handler::clone(name,
mem_root));
if (new_handler)
new_handler->file->state= file->state;
return new_handler;
}
static const char *ha_myisam_exts[] = {
".MYI",
".MYD",
NullS
};
const char *ha_myisam::index_type(uint key_number)
{
return ((table->key_info[key_number].flags & HA_FULLTEXT) ?
"FULLTEXT" :
(table->key_info[key_number].flags & HA_SPATIAL) ?
"SPATIAL" :
(table->key_info[key_number].algorithm == HA_KEY_ALG_RTREE) ?
"RTREE" :
"BTREE");
}
ulong ha_myisam::index_flags(uint inx, uint part, bool all_parts) const
{
ulong flags;
if (table_share->key_info[inx].algorithm == HA_KEY_ALG_FULLTEXT)
flags= 0;
else
if ((table_share->key_info[inx].flags & HA_SPATIAL ||
table_share->key_info[inx].algorithm == HA_KEY_ALG_RTREE))
{
/* All GIS scans are non-ROR scans. We also disable IndexConditionPushdown */
flags= HA_READ_NEXT | HA_READ_PREV | HA_READ_RANGE |
HA_READ_ORDER | HA_KEYREAD_ONLY | HA_KEY_SCAN_NOT_ROR;
}
else
{
flags= HA_READ_NEXT | HA_READ_PREV | HA_READ_RANGE |
HA_READ_ORDER | HA_KEYREAD_ONLY | HA_DO_INDEX_COND_PUSHDOWN;
}
return flags;
}
/* Name is here without an extension */
int ha_myisam::open(const char *name, int mode, uint test_if_locked)
{
MI_KEYDEF *keyinfo;
MI_COLUMNDEF *recinfo= 0;
uint recs;
uint i;
/*
If the user wants to have memory mapped data files, add an
open_flag. Do not memory map temporary tables because they are
expected to be inserted and thus extended a lot. Memory mapping is
efficient for files that keep their size, but very inefficient for
growing files. Using an open_flag instead of calling mi_extra(...
HA_EXTRA_MMAP ...) after mi_open() has the advantage that the
mapping is not repeated for every open, but just done on the initial
open, when the MyISAM share is created. Everytime the server
requires to open a new instance of a table it calls this method. We
will always supply HA_OPEN_MMAP for a permanent table. However, the
MyISAM storage engine will ignore this flag if this is a secondary
open of a table that is in use by other threads already (if the
MyISAM share exists already).
*/
if (!(test_if_locked & HA_OPEN_TMP_TABLE) && opt_myisam_use_mmap)
test_if_locked|= HA_OPEN_MMAP;
if (!(file=mi_open(name, mode, test_if_locked | HA_OPEN_FROM_SQL_LAYER)))
return (my_errno ? my_errno : -1);
file->s->chst_invalidator= query_cache_invalidate_by_MyISAM_filename_ref;
/* Set external_ref, mainly for temporary tables */
file->external_ref= (void*) table; // For mi_killed()
/* No need to perform a check for tmp table or if it's already checked */
if (!table->s->tmp_table && file->s->reopen == 1)
{
if ((my_errno= table2myisam(table, &keyinfo, &recinfo, &recs)))
{
/* purecov: begin inspected */
DBUG_PRINT("error", ("Failed to convert TABLE object to MyISAM "
"key and column definition"));
goto err;
/* purecov: end */
}
if (check_definition(keyinfo, recinfo, table->s->keys, recs,
file->s->keyinfo, file->s->rec,
file->s->base.keys, file->s->base.fields,
true, table))
{
/* purecov: begin inspected */
my_errno= HA_ERR_INCOMPATIBLE_DEFINITION;
goto err;
/* purecov: end */
}
}
if (test_if_locked & (HA_OPEN_IGNORE_IF_LOCKED | HA_OPEN_TMP_TABLE))
(void) mi_extra(file, HA_EXTRA_NO_WAIT_LOCK, 0);
info(HA_STATUS_NO_LOCK | HA_STATUS_VARIABLE | HA_STATUS_CONST);
if (!(test_if_locked & HA_OPEN_WAIT_IF_LOCKED))
(void) mi_extra(file, HA_EXTRA_WAIT_LOCK, 0);
if (!table->s->db_record_offset)
int_table_flags|=HA_REC_NOT_IN_SEQ;
if (file->s->options & (HA_OPTION_CHECKSUM | HA_OPTION_COMPRESS_RECORD))
{
/*
Set which type of automatic checksum we have
The old checksum and new checksum are identical if there is no
null fields.
Files with new checksum has the HA_OPTION_NULL_FIELDS bit set.
*/
if ((file->s->options & HA_OPTION_NULL_FIELDS) ||
!file->s->has_null_fields)
int_table_flags|= HA_HAS_NEW_CHECKSUM;
if (!(file->s->options & HA_OPTION_NULL_FIELDS))
int_table_flags|= HA_HAS_OLD_CHECKSUM;
}
/*
For static size rows, tell MariaDB that we will access all bytes
in the record when writing it. This signals MariaDB to initalize
the full row to ensure we don't get any errors from valgrind and
that all bytes in the row is properly reset.
*/
if ((file->s->options & HA_OPTION_PACK_RECORD) &&
(file->s->has_varchar_fields | file->s->has_null_fields))
int_table_flags|= HA_RECORD_MUST_BE_CLEAN_ON_WRITE;
for (i= 0; i < table->s->keys; i++)
{
plugin_ref parser= table->key_info[i].parser;
if (table->key_info[i].flags & HA_USES_PARSER)
file->s->keyinfo[i].parser=
(struct st_mysql_ftparser *)plugin_decl(parser)->info;
table->key_info[i].block_size= file->s->keyinfo[i].block_length;
}
my_errno= 0;
/* Count statistics of usage for newly open normal files */
if (file->s->reopen == 1 && ! (test_if_locked & HA_OPEN_TMP_TABLE))
{
if (file->s->delay_key_write)
feature_files_opened_with_delayed_keys++;
}
goto end;
err:
this->close();
end:
/*
Both recinfo and keydef are allocated by my_multi_malloc(), thus only
recinfo must be freed.
*/
if (recinfo)
my_free(recinfo);
return my_errno;
}
int ha_myisam::close(void)
{
MI_INFO *tmp=file;
if (!tmp)
return 0;
file=0;
return mi_close(tmp);
}
int ha_myisam::write_row(uchar *buf)
{
/*
If we have an auto_increment column and we are writing a changed row
or a new row, then update the auto_increment value in the record.
*/
if (table->next_number_field && buf == table->record[0])
{
int error;
if ((error= update_auto_increment()))
return error;
}
return mi_write(file,buf);
}
void ha_myisam::setup_vcols_for_repair(HA_CHECK *param)
{
DBUG_ASSERT(file->s->base.reclength <= file->s->vreclength);
if (!table->vfield)
return;
if (file->s->base.reclength == file->s->vreclength)
{
bool indexed_vcols= false;
ulong new_vreclength= file->s->vreclength;
for (Field **vf= table->vfield; *vf; vf++)
{
uint vf_end= (*vf)->offset(table->record[0]) + (*vf)->pack_length_in_rec();
set_if_bigger(new_vreclength, vf_end);
indexed_vcols|= (*vf)->flags & PART_KEY_FLAG;
}
if (!indexed_vcols)
return;
file->s->vreclength= new_vreclength;
}
param->fix_record= compute_vcols;
table->use_all_columns();
table->vcol_set= &table->s->all_set;
}
void ha_myisam::restore_vcos_after_repair()
{
if (file->s->base.reclength < file->s->vreclength)
{
table->move_fields(table->field, table->record[0], table->field[0]->record_ptr());
table->default_column_bitmaps();
}
}
int ha_myisam::check(THD* thd, HA_CHECK_OPT* check_opt)
{
if (!file) return HA_ADMIN_INTERNAL_ERROR;
int error;
HA_CHECK *param= (HA_CHECK*) thd->alloc(sizeof *param);
MYISAM_SHARE* share = file->s;
const char *old_proc_info=thd->proc_info;
if (!param)
return HA_ADMIN_INTERNAL_ERROR;
thd_proc_info(thd, "Checking table");
myisamchk_init(param);
param->thd = thd;
param->op_name = "check";
param->db_name= table->s->db.str;
param->table_name= table->alias.c_ptr();
param->testflag = check_opt->flags | T_CHECK | T_SILENT;
param->stats_method= (enum_handler_stats_method)THDVAR(thd, stats_method);
if (!(table->db_stat & HA_READ_ONLY))
param->testflag|= T_STATISTICS;
param->using_global_keycache = 1;
if (!mi_is_crashed(file) &&
(((param->testflag & T_CHECK_ONLY_CHANGED) &&
!(share->state.changed & (STATE_CHANGED | STATE_CRASHED |
STATE_CRASHED_ON_REPAIR)) &&
share->state.open_count == 0) ||
((param->testflag & T_FAST) && (share->state.open_count ==
(uint) (share->global_changed ? 1 : 0)))))
return HA_ADMIN_ALREADY_DONE;
setup_vcols_for_repair(param);
error = chk_status(param, file); // Not fatal
error = chk_size(param, file);
if (!error)
error |= chk_del(param, file, param->testflag);
if (!error)
error = chk_key(param, file);
if (!error)
{
if ((!(param->testflag & T_QUICK) &&
((share->options &
(HA_OPTION_PACK_RECORD | HA_OPTION_COMPRESS_RECORD)) ||
(param->testflag & (T_EXTEND | T_MEDIUM)))) ||
mi_is_crashed(file))
{
ulonglong old_testflag= param->testflag;
param->testflag|=T_MEDIUM;
if (!(error= init_io_cache(¶m->read_cache, file->dfile,
my_default_record_cache_size, READ_CACHE,
share->pack.header_length, 1, MYF(MY_WME))))
{
error= chk_data_link(param, file, MY_TEST(param->testflag & T_EXTEND));
end_io_cache(¶m->read_cache);
}
param->testflag= old_testflag;
}
}
if (!error)
{
if ((share->state.changed & (STATE_CHANGED |
STATE_CRASHED_ON_REPAIR |
STATE_CRASHED | STATE_NOT_ANALYZED)) ||
(param->testflag & T_STATISTICS) ||
mi_is_crashed(file))
{
file->update|=HA_STATE_CHANGED | HA_STATE_ROW_CHANGED;
mysql_mutex_lock(&share->intern_lock);