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137 lines
4 KiB
C
137 lines
4 KiB
C
/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
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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 as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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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 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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/* L{ser och skriver nyckelblock */
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#include "isamdef.h"
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#ifdef __WIN__
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#include <errno.h>
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#endif
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/* Fetch a key-page in memory */
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uchar *_nisam_fetch_keypage(register N_INFO *info, N_KEYDEF *keyinfo,
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my_off_t page, uchar *buff, int return_buffer)
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{
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uchar *tmp;
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tmp=(uchar*) key_cache_read(info->s->kfile,page,(byte*) buff,
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(uint) keyinfo->base.block_length,
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(uint) keyinfo->base.block_length,
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return_buffer);
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if (tmp == info->buff)
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{
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info->update|=HA_STATE_BUFF_SAVED;
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info->int_pos=(ulong) page;
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info->buff_used=1;
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}
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else
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{
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info->update&= ~HA_STATE_BUFF_SAVED;
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if (tmp)
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info->int_pos=(ulong) page;
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else
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{
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info->int_pos=NI_POS_ERROR;
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DBUG_PRINT("error",("Got errno: %d from key_cache_read",my_errno));
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my_errno=HA_ERR_CRASHED;
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}
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}
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return tmp;
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} /* _nisam_fetch_keypage */
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/* Write a key-page on disk */
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int _nisam_write_keypage(register N_INFO *info, register N_KEYDEF *keyinfo,
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my_off_t page, uchar *buff)
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{
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reg3 uint length;
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#ifndef QQ /* Safety check */
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if (page < info->s->base.keystart ||
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page+keyinfo->base.block_length > info->s->state.key_file_length ||
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page & (nisam_block_size-1))
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{
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DBUG_PRINT("error",("Trying to write outside key region: %lu",
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(long) page));
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my_errno=EINVAL;
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return(-1);
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}
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DBUG_PRINT("page",("write page at: %lu",(long) page,buff));
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DBUG_DUMP("buff",(byte*) buff,getint(buff));
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#endif
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if ((length=keyinfo->base.block_length) > IO_SIZE*2 &&
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info->s->state.key_file_length != page+length)
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length= ((getint(buff)+IO_SIZE-1) & (uint) ~(IO_SIZE-1));
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#ifdef HAVE_purify
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{
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length=getint(buff);
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bzero((byte*) buff+length,keyinfo->base.block_length-length);
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length=keyinfo->base.block_length;
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}
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#endif
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return (key_cache_write(info->s->kfile,page,(byte*) buff,length,
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(uint) keyinfo->base.block_length,
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(int) (info->lock_type != F_UNLCK)));
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} /* nisam_write_keypage */
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/* Remove page from disk */
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int _nisam_dispose(register N_INFO *info, N_KEYDEF *keyinfo, my_off_t pos)
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{
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uint keynr= (uint) (keyinfo - info->s->keyinfo);
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ulong old_link; /* ulong is ok here */
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DBUG_ENTER("_nisam_dispose");
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old_link=info->s->state.key_del[keynr];
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info->s->state.key_del[keynr]=(ulong) pos;
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DBUG_RETURN(key_cache_write(info->s->kfile,pos,(byte*) &old_link,
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sizeof(long),
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(uint) keyinfo->base.block_length,
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(int) (info->lock_type != F_UNLCK)));
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} /* _nisam_dispose */
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/* Make new page on disk */
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ulong _nisam_new(register N_INFO *info, N_KEYDEF *keyinfo)
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{
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uint keynr= (uint) (keyinfo - info->s->keyinfo);
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ulong pos;
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DBUG_ENTER("_nisam_new");
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if ((pos=info->s->state.key_del[keynr]) == NI_POS_ERROR)
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{
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if (info->s->state.key_file_length >= info->s->base.max_key_file_length)
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{
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my_errno=HA_ERR_INDEX_FILE_FULL;
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DBUG_RETURN(NI_POS_ERROR);
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}
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pos=info->s->state.key_file_length;
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info->s->state.key_file_length+= keyinfo->base.block_length;
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}
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else
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{
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if (!key_cache_read(info->s->kfile,pos,
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(byte*) &info->s->state.key_del[keynr],
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(uint) sizeof(long),
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(uint) keyinfo->base.block_length,0))
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pos= NI_POS_ERROR;
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}
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DBUG_PRINT("exit",("Pos: %d",pos));
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DBUG_RETURN(pos);
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} /* _nisam_new */
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