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79 lines
2.6 KiB
C
79 lines
2.6 KiB
C
/*
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Copyright (c) 2000, 2011, Oracle and/or its affiliates
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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; version 2 of the License.
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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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */
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/* Remove all rows from a MyISAM table */
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/* This clears the status information and truncates files */
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#include "myisamdef.h"
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int mi_delete_all_rows(MI_INFO *info)
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{
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uint i;
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MYISAM_SHARE *share=info->s;
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MI_STATE_INFO *state=&share->state;
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DBUG_ENTER("mi_delete_all_rows");
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if (share->options & HA_OPTION_READ_ONLY_DATA)
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{
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DBUG_RETURN(my_errno=EACCES);
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}
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if (_mi_readinfo(info,F_WRLCK,1))
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DBUG_RETURN(my_errno);
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if (_mi_mark_file_changed(info))
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goto err;
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info->state->records=info->state->del=state->split=0;
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state->dellink = HA_OFFSET_ERROR;
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state->sortkey= (ushort) ~0;
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info->state->key_file_length=share->base.keystart;
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info->state->data_file_length=0;
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info->state->empty=info->state->key_empty=0;
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info->state->checksum=0;
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for (i=share->base.max_key_block_length/MI_MIN_KEY_BLOCK_LENGTH ; i-- ; )
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state->key_del[i]= HA_OFFSET_ERROR;
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for (i=0 ; i < share->base.keys ; i++)
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state->key_root[i]= HA_OFFSET_ERROR;
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myisam_log_command(MI_LOG_DELETE_ALL,info,(uchar*) 0,0,0);
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/*
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If we are using delayed keys or if the user has done changes to the tables
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since it was locked then there may be key blocks in the key cache
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*/
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flush_key_blocks(share->key_cache, share->kfile, &share->dirty_part_map,
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FLUSH_IGNORE_CHANGED);
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#ifdef HAVE_MMAP
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if (share->file_map)
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mi_munmap_file(info);
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#endif
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if (mysql_file_chsize(info->dfile, 0, 0, MYF(MY_WME)) ||
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mysql_file_chsize(share->kfile, share->base.keystart, 0, MYF(MY_WME)))
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goto err;
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if (info->opt_flag & WRITE_CACHE_USED)
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reinit_io_cache(&info->rec_cache, WRITE_CACHE, 0, 1, 1);
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(void) _mi_writeinfo(info,WRITEINFO_UPDATE_KEYFILE);
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DBUG_RETURN(0);
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err:
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{
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int save_errno=my_errno;
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(void) _mi_writeinfo(info,WRITEINFO_UPDATE_KEYFILE);
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info->update|=HA_STATE_WRITTEN; /* Buffer changed */
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DBUG_RETURN(my_errno=save_errno);
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}
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} /* mi_delete */
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