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/* Copyright (C) 2006 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; 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
/* Read and write key blocks */
#include "maria_def.h"
/* Fetch a key-page in memory */
byte *_ma_fetch_keypage(register MARIA_HA *info, MARIA_KEYDEF *keyinfo,
my_off_t page, int level,
byte *buff, int return_buffer)
{
byte *tmp;
uint page_size;
DBUG_ENTER("_ma_fetch_keypage");
DBUG_PRINT("enter",("page: %ld", (long) page));
DBUG_ASSERT(info->s->pagecache->block_size == keyinfo->block_length &&
info->s->pagecache->block_size == info->s->block_size);
/*
TODO: replace PAGECACHE_PLAIN_PAGE with PAGECACHE_LSN_PAGE when
LSN on the pages will be implemented
*/
tmp= pagecache_read(info->s->pagecache, &info->s->kfile,
page / keyinfo->block_length, level, buff,
PAGECACHE_PLAIN_PAGE, PAGECACHE_LOCK_LEFT_UNLOCKED, 0);
if (tmp == info->buff)
info->keyread_buff_used=1;
else if (!tmp)
{
DBUG_PRINT("error",("Got errno: %d from pagecache_read",my_errno));
info->last_keypage=HA_OFFSET_ERROR;
maria_print_error(info->s, HA_ERR_CRASHED);
my_errno=HA_ERR_CRASHED;
DBUG_RETURN(0);
}
info->last_keypage=page;
page_size=maria_getint(tmp);
if (page_size < 4 || page_size > keyinfo->block_length)
{
DBUG_PRINT("error",("page %lu had wrong page length: %u",
(ulong) page, page_size));
DBUG_DUMP("page", (char*) tmp, keyinfo->block_length);
info->last_keypage = HA_OFFSET_ERROR;
maria_print_error(info->s, HA_ERR_CRASHED);
my_errno= HA_ERR_CRASHED;
tmp= 0;
}
DBUG_RETURN(tmp);
} /* _ma_fetch_keypage */
/* Write a key-page on disk */
int _ma_write_keypage(register MARIA_HA *info, register MARIA_KEYDEF *keyinfo,
my_off_t page, int level, byte *buff)
{
DBUG_ENTER("_ma_write_keypage");
#ifndef FAST /* Safety check */
if (page < info->s->base.keystart ||
page+keyinfo->block_length > info->state->key_file_length ||
(page & (MARIA_MIN_KEY_BLOCK_LENGTH-1)))
{
DBUG_PRINT("error",("Trying to write inside key status region: "
"key_start: %lu length: %lu page: %lu",
(long) info->s->base.keystart,
(long) info->state->key_file_length,
(long) page));
my_errno=EINVAL;
DBUG_RETURN((-1));
}
DBUG_PRINT("page",("write page at: %lu",(long) page));
DBUG_DUMP("buff",(byte*) buff,maria_getint(buff));
#endif
DBUG_ASSERT(info->s->pagecache->block_size == keyinfo->block_length);
DBUG_ASSERT(info->s->pagecache->block_size == info->s->block_size);
/*
TODO: replace PAGECACHE_PLAIN_PAGE with PAGECACHE_LSN_PAGE when
LSN on the pages will be implemented
*/
DBUG_RETURN(pagecache_write(info->s->pagecache,
&info->s->kfile, page / keyinfo->block_length,
level, buff, PAGECACHE_PLAIN_PAGE,
PAGECACHE_LOCK_LEFT_UNLOCKED,
PAGECACHE_PIN_LEFT_UNPINNED,
PAGECACHE_WRITE_DELAY, 0));
} /* maria_write_keypage */
/* Remove page from disk */
int _ma_dispose(register MARIA_HA *info, MARIA_KEYDEF *keyinfo, my_off_t pos,
int level)
{
my_off_t old_link;
char buff[8];
uint offset;
pgcache_page_no_t page_no;
DBUG_ENTER("_ma_dispose");
DBUG_PRINT("enter",("pos: %ld", (long) pos));
old_link= info->s->state.key_del;
info->s->state.key_del= pos;
page_no= pos / keyinfo->block_length;
offset= pos % keyinfo->block_length;
mi_sizestore(buff,old_link);
info->s->state.changed|= STATE_NOT_SORTED_PAGES;
DBUG_ASSERT(info->s->pagecache->block_size == keyinfo->block_length &&
info->s->pagecache->block_size == info->s->block_size);
/*
TODO: replace PAGECACHE_PLAIN_PAGE with PAGECACHE_LSN_PAGE when
LSN on the pages will be implemented
*/
DBUG_RETURN(pagecache_write_part(info->s->pagecache,
&info->s->kfile, page_no, level, buff,
PAGECACHE_PLAIN_PAGE,
PAGECACHE_LOCK_LEFT_UNLOCKED,
PAGECACHE_PIN_LEFT_UNPINNED,
PAGECACHE_WRITE_DELAY, 0,
offset, sizeof(buff)));
} /* _ma_dispose */
/* Make new page on disk */
my_off_t _ma_new(register MARIA_HA *info, MARIA_KEYDEF *keyinfo, int level)
{
my_off_t pos;
byte *buff;
DBUG_ENTER("_ma_new");
if ((pos= info->s->state.key_del) == HA_OFFSET_ERROR)
{
if (info->state->key_file_length >=
info->s->base.max_key_file_length - keyinfo->block_length)
{
my_errno=HA_ERR_INDEX_FILE_FULL;
DBUG_RETURN(HA_OFFSET_ERROR);
}
pos=info->state->key_file_length;
info->state->key_file_length+= keyinfo->block_length;
}
else
{
buff= alloca(info->s->block_size);
DBUG_ASSERT(info->s->pagecache->block_size == keyinfo->block_length &&
info->s->pagecache->block_size == info->s->block_size);
/*
TODO: replace PAGECACHE_PLAIN_PAGE with PAGECACHE_LSN_PAGE when
LSN on the pages will be implemented
*/
DBUG_ASSERT(info->s->pagecache->block_size == keyinfo->block_length);
if (!pagecache_read(info->s->pagecache,
&info->s->kfile, pos / keyinfo->block_length, level,
buff, PAGECACHE_PLAIN_PAGE,
PAGECACHE_LOCK_LEFT_UNLOCKED, 0))
pos= HA_OFFSET_ERROR;
else
info->s->state.key_del= mi_sizekorr(buff);
}
info->s->state.changed|= STATE_NOT_SORTED_PAGES;
DBUG_PRINT("exit",("Pos: %ld",(long) pos));
DBUG_RETURN(pos);
} /* _ma_new */
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