mirror of
https://github.com/MariaDB/server.git
synced 2025-01-18 04:53:01 +01:00
fff1f663c2
Updated VC++ files VC++Files/client/mysql.dsp: Update of VC++ files VC++Files/client/mysqlclient.dsp: Update of VC++ files VC++Files/libmysqld/examples/test_libmysqld.dsp: Update of VC++ files VC++Files/libmysqld/libmysqld.def: Update of VC++ files VC++Files/libmysqld/libmysqld.dsp: Update of VC++ files VC++Files/myisam/myisam.dsp: Update of VC++ files VC++Files/mysql.dsw: Update of VC++ files VC++Files/sql/mysqld.dsp: Update of VC++ files include/mysql.h: Add missing client functions to embedded server libmysql/libmysql.def: sort functions to enable comparison with libmysqld.def libmysqld/libmysqld.c: Add missing client functions to embedded server libmysqld/libmysqld.def: sort functions to enable comparison with libmysql.def Added missing functions myisam/mi_preload.c: Fixed compiler warning. Small code cleanup scripts/make_win_src_distribution.sh: Fixed typo Don't run zip in verbose mode scripts/mysql_create_system_tables.sh: Change so that localhost has full access (to make this like 4.0) scripts/mysql_fix_privilege_tables.sh: Allow on to run this from the source distribution sql-common/client.c: Fixed memory leak sql/item_sum.cc: Removed compiler warning sql/slave.cc: Cleanup sql/sql_client.cc: Portability fix sql/sql_help.cc: Fixed memory leak
114 lines
3.1 KiB
C
114 lines
3.1 KiB
C
/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
|
|
|
|
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; either version 2 of the License, or
|
|
(at your option) any later version.
|
|
|
|
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 */
|
|
|
|
/*
|
|
Preload indexes into key cache
|
|
*/
|
|
|
|
#include "myisamdef.h"
|
|
|
|
|
|
/*
|
|
Preload pages of the index file for a table into the key cache
|
|
|
|
SYNOPSIS
|
|
mi_preload()
|
|
info open table
|
|
map map of indexes to preload into key cache
|
|
ignore_leaves only non-leaves pages are to be preloaded
|
|
|
|
RETURN VALUE
|
|
0 if a success. error code - otherwise.
|
|
|
|
NOTES.
|
|
At present pages for all indexes are preloaded.
|
|
In future only pages for indexes specified in the key_map parameter
|
|
of the table will be preloaded.
|
|
*/
|
|
|
|
int mi_preload(MI_INFO *info, ulonglong key_map, my_bool ignore_leaves)
|
|
{
|
|
uint i;
|
|
ulong length, block_length= 0;
|
|
uchar *buff= NULL;
|
|
MYISAM_SHARE* share= info->s;
|
|
uint keys= share->state.header.keys;
|
|
MI_KEYDEF *keyinfo= share->keyinfo;
|
|
my_off_t key_file_length= share->state.state.key_file_length;
|
|
my_off_t pos= share->base.keystart;
|
|
DBUG_ENTER("mi_preload");
|
|
|
|
if (!keys || !key_map || key_file_length == pos)
|
|
DBUG_RETURN(0);
|
|
|
|
block_length= keyinfo[0].block_length;
|
|
|
|
/* Check whether all indexes use the same block size */
|
|
for (i= 1 ; i < keys ; i++)
|
|
{
|
|
if (keyinfo[i].block_length != block_length)
|
|
DBUG_RETURN(my_errno= HA_ERR_NON_UNIQUE_BLOCK_SIZE);
|
|
}
|
|
|
|
length= info->preload_buff_size/block_length * block_length;
|
|
set_if_bigger(length, block_length);
|
|
|
|
if (!(buff= (uchar *) my_malloc(length, MYF(MY_WME))))
|
|
DBUG_RETURN(my_errno= HA_ERR_OUT_OF_MEM);
|
|
|
|
if (flush_key_blocks(share->kfile, FLUSH_RELEASE))
|
|
goto err;
|
|
|
|
do
|
|
{
|
|
/* Read the next block of index file into the preload buffer */
|
|
if ((my_off_t) length > (key_file_length-pos))
|
|
length= (ulong) (key_file_length-pos);
|
|
if (my_pread(share->kfile, (byte*) buff, length, pos, MYF(MY_FAE)))
|
|
goto err;
|
|
|
|
if (ignore_leaves)
|
|
{
|
|
uchar *end= buff+length;
|
|
do
|
|
{
|
|
if (mi_test_if_nod(buff))
|
|
{
|
|
if (key_cache_insert(share->kfile, pos, (byte*) buff, block_length))
|
|
goto err;
|
|
}
|
|
pos+= block_length;
|
|
}
|
|
while ((buff+= block_length) != end);
|
|
buff= end-length;
|
|
}
|
|
else
|
|
{
|
|
if (key_cache_insert(share->kfile, pos, (byte*) buff, length))
|
|
goto err;
|
|
pos+= length;
|
|
}
|
|
}
|
|
while (pos != key_file_length);
|
|
|
|
my_free(buff, MYF(0));
|
|
DBUG_RETURN(0);
|
|
|
|
err:
|
|
my_free(buff, MYF(MY_ALLOW_ZERO_PTR));
|
|
DBUG_RETURN(my_errno= errno);
|
|
}
|
|
|