panic.c
上传用户:romrleung
上传日期:2022-05-23
资源大小:18897k
文件大小:4k
- /* 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(dflt_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,
- (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 */