mirror of
https://github.com/MariaDB/server.git
synced 2025-01-16 12:02:42 +01:00
144 lines
4.2 KiB
C
144 lines
4.2 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 */
|
|
|
|
/* Read and write key blocks */
|
|
|
|
#include "myisamdef.h"
|
|
#ifdef __WIN__
|
|
#include <errno.h>
|
|
#endif
|
|
|
|
/* Fetch a key-page in memory */
|
|
|
|
uchar *_mi_fetch_keypage(register MI_INFO *info, MI_KEYDEF *keyinfo,
|
|
my_off_t page, uchar *buff, int return_buffer)
|
|
{
|
|
uchar *tmp;
|
|
uint page_size;
|
|
tmp=(uchar*) key_cache_read(info->s->kfile,page,(byte*) buff,
|
|
(uint) keyinfo->block_length,
|
|
(uint) keyinfo->block_length,
|
|
return_buffer);
|
|
if (tmp == info->buff)
|
|
info->buff_used=1;
|
|
else if (!tmp)
|
|
{
|
|
DBUG_PRINT("error",("Got errno: %d from key_cache_read",my_errno));
|
|
info->last_keypage=HA_OFFSET_ERROR;
|
|
my_errno=HA_ERR_CRASHED;
|
|
return 0;
|
|
}
|
|
info->last_keypage=page;
|
|
page_size=mi_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));
|
|
info->last_keypage = HA_OFFSET_ERROR;
|
|
my_errno = HA_ERR_CRASHED;
|
|
tmp = 0;
|
|
}
|
|
return tmp;
|
|
} /* _mi_fetch_keypage */
|
|
|
|
|
|
/* Write a key-page on disk */
|
|
|
|
int _mi_write_keypage(register MI_INFO *info, register MI_KEYDEF *keyinfo,
|
|
my_off_t page, uchar *buff)
|
|
{
|
|
reg3 uint length;
|
|
#ifndef FAST /* Safety check */
|
|
if (page < info->s->base.keystart ||
|
|
page+keyinfo->block_length > info->state->key_file_length ||
|
|
page & (myisam_block_size-1))
|
|
{
|
|
DBUG_PRINT("error",("Trying to write outside key region: %lu",
|
|
(long) page));
|
|
my_errno=EINVAL;
|
|
return(-1);
|
|
}
|
|
DBUG_PRINT("page",("write page at: %lu",(long) page,buff));
|
|
DBUG_DUMP("buff",(byte*) buff,mi_getint(buff));
|
|
#endif
|
|
|
|
if ((length=keyinfo->block_length) > IO_SIZE*2 &&
|
|
info->state->key_file_length != page+length)
|
|
length= ((mi_getint(buff)+IO_SIZE-1) & (uint) ~(IO_SIZE-1));
|
|
#ifdef HAVE_purify
|
|
{
|
|
length=mi_getint(buff);
|
|
bzero((byte*) buff+length,keyinfo->block_length-length);
|
|
length=keyinfo->block_length;
|
|
}
|
|
#endif
|
|
return (key_cache_write(info->s->kfile,page,(byte*) buff,length,
|
|
(uint) keyinfo->block_length,
|
|
(int) ((info->lock_type != F_UNLCK) ||
|
|
info->s->delay_key_write)));
|
|
} /* mi_write_keypage */
|
|
|
|
|
|
/* Remove page from disk */
|
|
|
|
int _mi_dispose(register MI_INFO *info, MI_KEYDEF *keyinfo, my_off_t pos)
|
|
{
|
|
my_off_t old_link;
|
|
char buff[8];
|
|
DBUG_ENTER("_mi_dispose");
|
|
|
|
old_link=info->s->state.key_del[keyinfo->block_size];
|
|
info->s->state.key_del[keyinfo->block_size]=pos;
|
|
mi_sizestore(buff,old_link);
|
|
DBUG_RETURN(key_cache_write(info->s->kfile,pos,buff,
|
|
sizeof(buff),
|
|
(uint) keyinfo->block_length,
|
|
(int) (info->lock_type != F_UNLCK)));
|
|
} /* _mi_dispose */
|
|
|
|
|
|
/* Make new page on disk */
|
|
|
|
my_off_t _mi_new(register MI_INFO *info, MI_KEYDEF *keyinfo)
|
|
{
|
|
my_off_t pos;
|
|
char buff[8];
|
|
DBUG_ENTER("_mi_new");
|
|
|
|
if ((pos=info->s->state.key_del[keyinfo->block_size]) == 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
|
|
{
|
|
if (!key_cache_read(info->s->kfile,pos,
|
|
buff,
|
|
(uint) sizeof(buff),
|
|
(uint) keyinfo->block_length,0))
|
|
pos= HA_OFFSET_ERROR;
|
|
else
|
|
info->s->state.key_del[keyinfo->block_size]=mi_sizekorr(buff);
|
|
}
|
|
DBUG_PRINT("exit",("Pos: %d",pos));
|
|
DBUG_RETURN(pos);
|
|
} /* _mi_new */
|