134 lines
4.3 KiB
C++
134 lines
4.3 KiB
C++
/* Copyright (c) 2003, 2019, Oracle and/or its affiliates. All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License, version 2.0,
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as published by the Free Software Foundation.
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This program is also distributed with certain software (including
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but not limited to OpenSSL) that is licensed under separate terms,
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as designated in a particular file or component or in included license
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documentation. The authors of MySQL hereby grant you an additional
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permission to link the program and your derivative works with the
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separately licensed software that they have included with MySQL.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License, version 2.0, for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
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/*
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Preload indexes into key cache
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*/
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#include <errno.h>
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#include <stddef.h>
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#include <sys/types.h>
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#include "my_dbug.h"
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#include "my_inttypes.h"
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#include "my_macros.h"
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#include "storage/myisam/myisamdef.h"
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/*
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Preload pages of the index file for a table into the key cache
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SYNOPSIS
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mi_preload()
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info open table
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map map of indexes to preload into key cache
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ignore_leaves only non-leaves pages are to be preloaded
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RETURN VALUE
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0 if a success. error code - otherwise.
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NOTES.
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At present pages for all indexes are preloaded.
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In future only pages for indexes specified in the key_map parameter
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of the table will be preloaded.
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*/
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int mi_preload(MI_INFO *info, ulonglong key_map, bool ignore_leaves) {
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uint i;
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ulong length, block_length = 0;
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uchar *buff = NULL;
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MYISAM_SHARE *share = info->s;
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uint keys = share->state.header.keys;
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MI_KEYDEF *keyinfo = share->keyinfo;
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my_off_t key_file_length = share->state.state.key_file_length;
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my_off_t pos = share->base.keystart;
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DBUG_TRACE;
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if (!keys || !mi_is_any_key_active(key_map) || key_file_length == pos)
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return 0;
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/* Preload into a non initialized key cache should never happen. */
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DBUG_ASSERT(share->key_cache->key_cache_inited);
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block_length = keyinfo[0].block_length;
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if (ignore_leaves) {
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/* Check whether all indexes use the same block size */
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for (i = 1; i < keys; i++) {
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if (keyinfo[i].block_length != block_length) {
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set_my_errno(HA_ERR_NON_UNIQUE_BLOCK_SIZE);
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return HA_ERR_NON_UNIQUE_BLOCK_SIZE;
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}
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}
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} else
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block_length = share->key_cache->key_cache_block_size;
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length = info->preload_buff_size / block_length * block_length;
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set_if_bigger(length, block_length);
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if (!(buff = (uchar *)my_malloc(mi_key_memory_preload_buffer, length,
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MYF(MY_WME)))) {
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set_my_errno(HA_ERR_OUT_OF_MEM);
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return HA_ERR_OUT_OF_MEM;
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}
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if (flush_key_blocks(share->key_cache, keycache_thread_var(), share->kfile,
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FLUSH_RELEASE))
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goto err;
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do {
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/* Read the next block of index file into the preload buffer */
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if ((my_off_t)length > (key_file_length - pos))
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length = (ulong)(key_file_length - pos);
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if (mysql_file_pread(share->kfile, (uchar *)buff, length, pos,
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MYF(MY_FAE | MY_FNABP)))
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goto err;
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if (ignore_leaves) {
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uchar *end = buff + length;
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do {
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if (mi_test_if_nod(buff)) {
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if (key_cache_insert(share->key_cache, keycache_thread_var(),
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share->kfile, pos, DFLT_INIT_HITS, (uchar *)buff,
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block_length))
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goto err;
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}
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pos += block_length;
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} while ((buff += block_length) != end);
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buff = end - length;
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} else {
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if (key_cache_insert(share->key_cache, keycache_thread_var(),
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share->kfile, pos, DFLT_INIT_HITS, (uchar *)buff,
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length))
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goto err;
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pos += length;
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}
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} while (pos != key_file_length);
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my_free(buff);
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return 0;
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err:
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my_free(buff);
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set_my_errno(errno);
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return errno;
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}
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