~drizzle-trunk/drizzle/development

/* Copyright (C) 2000-2001, 2003 MySQL 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 */

#include "myisamdef.h"

	/* if flag == HA_PANIC_CLOSE then all misam files are closed */

	/* if flag == HA_PANIC_WRITE then all misam files are unlocked and

	   all changed data in single user misam is written to file */

	/* if flag == HA_PANIC_READ then all misam files that was locked when

	   mi_panic(HA_PANIC_WRITE) was done is locked. A mi_readinfo() is

	   done for all single user files to get changes in database */

int mi_panic(enum ha_panic_function flag)

{

  int error=0;

  LIST *list_element,*next_open;

  MI_INFO *info;

  pthread_mutex_lock(&THR_LOCK_myisam);

  for (list_element=myisam_open_list ; list_element ; list_element=next_open)

  {

    next_open=list_element->next;		/* Save if close */

    info=(MI_INFO*) list_element->data;

    switch (flag) {

    case HA_PANIC_CLOSE:

      pthread_mutex_unlock(&THR_LOCK_myisam);	/* Not exactly right... */

      if (mi_close(info))

	error=my_errno;

      pthread_mutex_lock(&THR_LOCK_myisam);

      break;

    case HA_PANIC_WRITE:		/* Do this to free databases */

#ifdef CANT_OPEN_FILES_TWICE

      if (info->s->options & HA_OPTION_READ_ONLY_DATA)

	break;

#endif

      if (flush_key_blocks(info->s->key_cache, info->s->kfile, FLUSH_RELEASE))

	error=my_errno;

      if (info->opt_flag & WRITE_CACHE_USED)

	if (flush_io_cache(&info->rec_cache))

	  error=my_errno;

      if (info->opt_flag & READ_CACHE_USED)

      {

	if (flush_io_cache(&info->rec_cache))

	  error=my_errno;

	reinit_io_cache(&info->rec_cache,READ_CACHE,0,

		       (bool) (info->lock_type != F_UNLCK),1);

      }

      if (info->lock_type != F_UNLCK && ! info->was_locked)

      {

	info->was_locked=info->lock_type;

	if (mi_lock_database(info,F_UNLCK))

	  error=my_errno;

      }

#ifdef CANT_OPEN_FILES_TWICE

      if (info->s->kfile >= 0 && my_close(info->s->kfile,MYF(0)))

	error = my_errno;

      if (info->dfile >= 0 && my_close(info->dfile,MYF(0)))

	error = my_errno;

      info->s->kfile=info->dfile= -1;	/* Files aren't open anymore */

      break;

#endif

    case HA_PANIC_READ:			/* Restore to before WRITE */

#ifdef CANT_OPEN_FILES_TWICE

      {					/* Open closed files */

	char name_buff[FN_REFLEN];

	if (info->s->kfile < 0)

	  if ((info->s->kfile= my_open(fn_format(name_buff,info->filename,"",

					      N_NAME_IEXT,4),info->mode,

				    MYF(MY_WME))) < 0)

	    error = my_errno;

	if (info->dfile < 0)

	{

	  if ((info->dfile= my_open(fn_format(name_buff,info->filename,"",

					      N_NAME_DEXT,4),info->mode,

				    MYF(MY_WME))) < 0)

	    error = my_errno;

	  info->rec_cache.file=info->dfile;

	}

      }

#endif

      if (info->was_locked)

      {

	if (mi_lock_database(info, info->was_locked))

	  error=my_errno;

	info->was_locked=0;

      }

      break;

    }

  }

  if (flag == HA_PANIC_CLOSE)

  {

    VOID(mi_log(0));				/* Close log if neaded */

  }

  pthread_mutex_unlock(&THR_LOCK_myisam);

  if (!error)

    return(0);

  return(my_errno=error);

} /* mi_panic */