1 files changed, 79 insertions, 0 deletions
diff --git a/storage/myisam/mi_delete_all.c b/storage/myisam/mi_delete_all.c
new file mode 100644
index 00000000..4bfe0e8d
--- /dev/null
+++ b/storage/myisam/mi_delete_all.c
@@ -0,0 +1,79 @@
+/*
+   Copyright (c) 2000, 2011, Oracle and/or its affiliates
+
+   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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335  USA */
+
+/* Remove all rows from a MyISAM table */
+/* This clears the status information and truncates files */
+
+#include "myisamdef.h"
+
+int mi_delete_all_rows(MI_INFO *info)
+{
+  uint i;
+  MYISAM_SHARE *share=info->s;
+  MI_STATE_INFO *state=&share->state;
+  DBUG_ENTER("mi_delete_all_rows");
+
+  if (share->options & HA_OPTION_READ_ONLY_DATA)
+  {
+    DBUG_RETURN(my_errno=EACCES);
+  }
+  if (_mi_readinfo(info,F_WRLCK,1))
+    DBUG_RETURN(my_errno);
+  if (_mi_mark_file_changed(info))
+    goto err;
+
+  info->state->records=info->state->del=state->split=0;
+  state->dellink = HA_OFFSET_ERROR;
+  state->sortkey=  (ushort) ~0;
+  info->state->key_file_length=share->base.keystart;
+  info->state->data_file_length=0;
+  info->state->empty=info->state->key_empty=0;
+  info->state->checksum=0;
+
+  for (i=share->base.max_key_block_length/MI_MIN_KEY_BLOCK_LENGTH ; i-- ; )
+    state->key_del[i]= HA_OFFSET_ERROR;
+  for (i=0 ; i < share->base.keys ; i++)
+    state->key_root[i]= HA_OFFSET_ERROR;
+
+  myisam_log_command(MI_LOG_DELETE_ALL,info,(uchar*) 0,0,0);
+  /*
+    If we are using delayed keys or if the user has done changes to the tables
+    since it was locked then there may be key blocks in the key cache
+  */
+  flush_key_blocks(share->key_cache, share->kfile, &share->dirty_part_map,
+                   FLUSH_IGNORE_CHANGED);
+#ifdef HAVE_MMAP
+  if (share->file_map)
+    mi_munmap_file(info);
+#endif
+  if (mysql_file_chsize(info->dfile, 0, 0, MYF(MY_WME)) ||
+      mysql_file_chsize(share->kfile, share->base.keystart, 0, MYF(MY_WME)))
+    goto err;
+
+  if (info->opt_flag & WRITE_CACHE_USED)
+    reinit_io_cache(&info->rec_cache, WRITE_CACHE, 0, 1, 1);
+
+  (void) _mi_writeinfo(info,WRITEINFO_UPDATE_KEYFILE);
+  DBUG_RETURN(0);
+
+err:
+  {
+    int save_errno=my_errno;
+    (void) _mi_writeinfo(info,WRITEINFO_UPDATE_KEYFILE);
+    info->update|=HA_STATE_WRITTEN;	/* Buffer changed */
+    DBUG_RETURN(my_errno=save_errno);
+  }
+} /* mi_delete */