~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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA */

#include "myisam_priv.h"

using namespace std;

using namespace drizzled;

	/* 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;

  MI_INFO *info;

  THR_LOCK_myisam.lock();

  list<MI_INFO *>::iterator it= myisam_open_list.begin();

  while (it != myisam_open_list.end())

  {

    info= *it;

    switch (flag) {

    case HA_PANIC_CLOSE:

      THR_LOCK_myisam.unlock();	/* Not exactly right... */

      if (mi_close(info))

	error=errno;

      THR_LOCK_myisam.lock();

      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 (info->opt_flag & WRITE_CACHE_USED)

	if (info->rec_cache.flush())

	  error=errno;

      if (info->opt_flag & READ_CACHE_USED)

      {

	if (info->rec_cache.flush())

	  error=errno;

        info->rec_cache.reinit_io_cache(internal::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=errno;

      }

#ifdef CANT_OPEN_FILES_TWICE

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

	error = errno;

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

	error = 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= internal::my_open(internal::fn_format(name_buff,info->filename,"",

					      N_NAME_IEXT,4),info->mode,

				    MYF(MY_WME))) < 0)

	    error = errno;

	if (info->dfile < 0)

	{

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

					      N_NAME_DEXT,4),info->mode,

				    MYF(MY_WME))) < 0)

	    error = errno;

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

	}

      }

#endif

      if (info->was_locked)

      {

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

	  error=errno;

	info->was_locked=0;

      }

      break;

    }

    ++it;

  }

  THR_LOCK_myisam.unlock();

  if (!error)

    return(0);

  return(errno=error);

} /* mi_panic */