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/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult 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; either version 2 of the License, or
(at your option) any later version.
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 "isamdef.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
nisam_panic(HA_PANIC_WRITE) was done is locked. A ni_readinfo() is
done for all single user files to get changes in database */
int nisam_panic(enum ha_panic_function flag)
{
int error=0;
LIST *list_element,*next_open;
N_INFO *info;
DBUG_ENTER("nisam_panic");
pthread_mutex_lock(&THR_LOCK_isam);
for (list_element=nisam_open_list ; list_element ; list_element=next_open)
{
next_open=list_element->next; /* Save if close */
info=(N_INFO*) list_element->data;
switch (flag) {
case HA_PANIC_CLOSE:
pthread_mutex_unlock(&THR_LOCK_isam); /* Not exactly right... */
if (nisam_close(info))
error=my_errno;
pthread_mutex_lock(&THR_LOCK_isam);
break;
case HA_PANIC_WRITE: /* Do this to free databases */
#ifdef CANT_OPEN_FILES_TWICE
if (info->s->base.options & HA_OPTION_READ_ONLY_DATA)
break;
#endif
if (flush_key_blocks(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,
(pbool) (info->lock_type != F_UNLCK),1);
}
#ifndef NO_LOCKING
if (info->lock_type != F_UNLCK && ! info->was_locked)
{
info->was_locked=info->lock_type;
if (nisam_lock_database(info,F_UNLCK))
error=my_errno;
}
#else
{
int save_status=info->s->w_locks; /* Only w_locks! */
info->s->w_locks=0;
if (_nisam_writeinfo(info, test(info->update & HA_STATE_CHANGED)))
error=my_errno;
info->s->w_locks=save_status;
info->update&= ~HA_STATE_CHANGED; /* Not changed */
}
#endif /* NO_LOCKING */
#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
#ifndef NO_LOCKING
if (info->was_locked)
{
if (nisam_lock_database(info, info->was_locked))
error=my_errno;
info->was_locked=0;
}
#else
{
int lock_type,w_locks;
lock_type=info->lock_type ; w_locks=info->s->w_locks;
info->lock_type=0; info->s->w_locks=0;
if (_nisam_readinfo(info,0,1)) /* Read changed data */
error=my_errno;
info->lock_type=lock_type; info->s->w_locks=w_locks;
}
/* Don't use buffer when doing next */
info->update|=HA_STATE_WRITTEN;
#endif /* NO_LOCKING */
break;
}
}
if (flag == HA_PANIC_CLOSE)
VOID(nisam_log(0)); /* Close log if neaded */
pthread_mutex_unlock(&THR_LOCK_isam);
if (!error) DBUG_RETURN(0);
my_errno=error;
DBUG_RETURN(-1);
} /* nisam_panic */
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