diff options
Diffstat (limited to 'myisam/mi_panic.c')
| -rw-r--r-- | myisam/mi_panic.c | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/myisam/mi_panic.c b/myisam/mi_panic.c new file mode 100644 index 00000000000..ae149df3ffe --- /dev/null +++ b/myisam/mi_panic.c @@ -0,0 +1,111 @@ +/* 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 "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; + DBUG_ENTER("mi_panic"); + + 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->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); + } + 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) + DBUG_RETURN(0); + DBUG_RETURN(my_errno=error); +} /* mi_panic */ |