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mariadb/myisam/mi_locking.c
ingo@mysql.com c39be2d0e7 WL#1895 - Print message to error log in case of detected MyISAM corruption 
Changed my_error() to print error messages, which come from
arbitrary registered ranges of error messages. Messages can
be unregistered (and should be at end of the program).
Added registration of handler error messages.
Added a new mi_print_error() macro and a new 
mi_report_error() function, which supply error
messages with a table name.
Added calls to mi_print_error() or mi_report_error()
at all places in MyISAM, where table corruption is detected.
2004-12-23 20:11:38 +01:00

510 lines
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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 */
/*
locking of isam-tables.
reads info from a isam-table. Must be first request before doing any furter
calls to any isamfunktion. Is used to allow many process use the same
isamdatabase.
*/
#include "myisamdef.h"
/* lock table by F_UNLCK, F_RDLCK or F_WRLCK */
int mi_lock_database(MI_INFO *info, int lock_type)
{
int error;
uint count;
MYISAM_SHARE *share=info->s;
uint flag;
DBUG_ENTER("mi_lock_database");
DBUG_PRINT("enter",("lock_type: %d old lock %d r_locks: %u w_locks: %u "
"global_changed: %d open_count: %u name: '%s'",
lock_type, info->lock_type, share->r_locks,
share->w_locks,
share->global_changed, share->state.open_count,
share->index_file_name));
if (share->options & HA_OPTION_READ_ONLY_DATA ||
info->lock_type == lock_type)
DBUG_RETURN(0);
if (lock_type == F_EXTRA_LCK) /* Used by TMP tables */
{
++share->w_locks;
++share->tot_locks;
info->lock_type= lock_type;
DBUG_RETURN(0);
}
flag=error=0;
pthread_mutex_lock(&share->intern_lock);
if (share->kfile >= 0) /* May only be false on windows */
{
switch (lock_type) {
case F_UNLCK:
if (info->lock_type == F_RDLCK)
count= --share->r_locks;
else
count= --share->w_locks;
--share->tot_locks;
if (info->lock_type == F_WRLCK && !share->w_locks &&
!share->delay_key_write && flush_key_blocks(share->key_cache,
share->kfile,FLUSH_KEEP))
{
error=my_errno;
mi_print_error(info, HA_ERR_CRASHED);
mi_mark_crashed(info); /* Mark that table must be checked */
}
if (info->opt_flag & (READ_CACHE_USED | WRITE_CACHE_USED))
{
if (end_io_cache(&info->rec_cache))
{
error=my_errno;
mi_print_error(info, HA_ERR_CRASHED);
mi_mark_crashed(info);
}
}
if (!count)
{
DBUG_PRINT("info",("changed: %u w_locks: %u",
(uint) share->changed, share->w_locks));
if (share->changed && !share->w_locks)
{
share->state.process= share->last_process=share->this_process;
share->state.unique= info->last_unique= info->this_unique;
share->state.update_count= info->last_loop= ++info->this_loop;
if (mi_state_info_write(share->kfile, &share->state, 1))
error=my_errno;
share->changed=0;
if (myisam_flush)
{
if (my_sync(share->kfile, MYF(0)))
error= my_errno;
if (my_sync(info->dfile, MYF(0)))
error= my_errno;
}
else
share->not_flushed=1;
if (error)
{
mi_print_error(info, HA_ERR_CRASHED);
mi_mark_crashed(info);
}
}
if (info->lock_type != F_EXTRA_LCK)
{
if (share->r_locks)
{ /* Only read locks left */
flag=1;
if (my_lock(share->kfile,F_RDLCK,0L,F_TO_EOF,
MYF(MY_WME | MY_SEEK_NOT_DONE)) && !error)
error=my_errno;
}
else if (!share->w_locks)
{ /* No more locks */
flag=1;
if (my_lock(share->kfile,F_UNLCK,0L,F_TO_EOF,
MYF(MY_WME | MY_SEEK_NOT_DONE)) && !error)
error=my_errno;
}
}
}
info->opt_flag&= ~(READ_CACHE_USED | WRITE_CACHE_USED);
info->lock_type= F_UNLCK;
break;
case F_RDLCK:
if (info->lock_type == F_WRLCK)
{
/*
Change RW to READONLY
mysqld does not turn write locks to read locks,
so we're never here in mysqld.
*/
if (share->w_locks == 1)
{
flag=1;
if (my_lock(share->kfile,lock_type,0L,F_TO_EOF,
MYF(MY_SEEK_NOT_DONE)))
{
error=my_errno;
break;
}
}
share->w_locks--;
share->r_locks++;
info->lock_type=lock_type;
break;
}
if (!share->r_locks && !share->w_locks)
{
flag=1;
if (my_lock(share->kfile,lock_type,0L,F_TO_EOF,
info->lock_wait | MY_SEEK_NOT_DONE))
{
error=my_errno;
break;
}
if (mi_state_info_read_dsk(share->kfile, &share->state, 1))
{
error=my_errno;
VOID(my_lock(share->kfile,F_UNLCK,0L,F_TO_EOF,MYF(MY_SEEK_NOT_DONE)));
my_errno=error;
break;
}
}
VOID(_mi_test_if_changed(info));
share->r_locks++;
share->tot_locks++;
info->lock_type=lock_type;
break;
case F_WRLCK:
if (info->lock_type == F_RDLCK)
{ /* Change READONLY to RW */
if (share->r_locks == 1)
{
flag=1;
if (my_lock(share->kfile,lock_type,0L,F_TO_EOF,
MYF(info->lock_wait | MY_SEEK_NOT_DONE)))
{
error=my_errno;
break;
}
share->r_locks--;
share->w_locks++;
info->lock_type=lock_type;
break;
}
}
if (!(share->options & HA_OPTION_READ_ONLY_DATA))
{
if (!share->w_locks)
{
flag=1;
if (my_lock(share->kfile,lock_type,0L,F_TO_EOF,
info->lock_wait | MY_SEEK_NOT_DONE))
{
error=my_errno;
break;
}
if (!share->r_locks)
{
if (mi_state_info_read_dsk(share->kfile, &share->state, 1))
{
error=my_errno;
VOID(my_lock(share->kfile,F_UNLCK,0L,F_TO_EOF,
info->lock_wait | MY_SEEK_NOT_DONE));
my_errno=error;
break;
}
}
}
}
VOID(_mi_test_if_changed(info));
info->lock_type=lock_type;
info->invalidator=info->s->invalidator;
share->w_locks++;
share->tot_locks++;
break;
default:
break; /* Impossible */
}
}
pthread_mutex_unlock(&share->intern_lock);
#if defined(FULL_LOG) || defined(_lint)
lock_type|=(int) (flag << 8); /* Set bit to set if real lock */
myisam_log_command(MI_LOG_LOCK,info,(byte*) &lock_type,sizeof(lock_type),
error);
#endif
DBUG_RETURN(error);
} /* mi_lock_database */
/****************************************************************************
The following functions are called by thr_lock() in threaded applications
****************************************************************************/
void mi_get_status(void* param)
{
MI_INFO *info=(MI_INFO*) param;
DBUG_ENTER("mi_get_status");
DBUG_PRINT("info",("key_file: %ld data_file: %ld",
(long) info->s->state.state.key_file_length,
(long) info->s->state.state.data_file_length));
#ifndef DBUG_OFF
if (info->state->key_file_length > info->s->state.state.key_file_length ||
info->state->data_file_length > info->s->state.state.data_file_length)
DBUG_PRINT("warning",("old info: key_file: %ld data_file: %ld",
(long) info->state->key_file_length,
(long) info->state->data_file_length));
#endif
info->save_state=info->s->state.state;
info->state= &info->save_state;
DBUG_VOID_RETURN;
}
void mi_update_status(void* param)
{
MI_INFO *info=(MI_INFO*) param;
/*
Because someone may have closed the table we point at, we only
update the state if its our own state. This isn't a problem as
we are always pointing at our own lock or at a read lock.
(This is enforced by thr_multi_lock.c)
*/
if (info->state == &info->save_state)
{
#ifndef DBUG_OFF
DBUG_PRINT("info",("updating status: key_file: %ld data_file: %ld",
(long) info->state->key_file_length,
(long) info->state->data_file_length));
if (info->state->key_file_length < info->s->state.state.key_file_length ||
info->state->data_file_length < info->s->state.state.data_file_length)
DBUG_PRINT("warning",("old info: key_file: %ld data_file: %ld",
(long) info->s->state.state.key_file_length,
(long) info->s->state.state.data_file_length));
#endif
info->s->state.state= *info->state;
info->state= &info->s->state.state;
}
/*
We have to flush the write cache here as other threads may start
reading the table before mi_lock_database() is called
*/
if (info->opt_flag & WRITE_CACHE_USED)
{
if (end_io_cache(&info->rec_cache))
{
mi_print_error(info, HA_ERR_CRASHED);
mi_mark_crashed(info);
}
info->opt_flag&= ~WRITE_CACHE_USED;
}
}
void mi_copy_status(void* to,void *from)
{
((MI_INFO*) to)->state= &((MI_INFO*) from)->save_state;
}
/*
Check if should allow concurrent inserts
IMPLEMENTATION
Don't allow concurrent inserts if we have a hole in the table.
NOTES
Rtree indexes are disabled in mi_open()
RETURN
0 ok to use concurrent inserts
1 not ok
*/
my_bool mi_check_status(void* param)
{
MI_INFO *info=(MI_INFO*) param;
return (my_bool) (info->s->state.dellink != HA_OFFSET_ERROR);
}
/****************************************************************************
** functions to read / write the state
****************************************************************************/
int _mi_readinfo(register MI_INFO *info, int lock_type, int check_keybuffer)
{
DBUG_ENTER("_mi_readinfo");
if (info->lock_type == F_UNLCK)
{
MYISAM_SHARE *share=info->s;
if (!share->tot_locks)
{
if (my_lock(share->kfile,lock_type,0L,F_TO_EOF,
info->lock_wait | MY_SEEK_NOT_DONE))
DBUG_RETURN(1);
if (mi_state_info_read_dsk(share->kfile, &share->state, 1))
{
int error=my_errno ? my_errno : -1;
VOID(my_lock(share->kfile,F_UNLCK,0L,F_TO_EOF,
MYF(MY_SEEK_NOT_DONE)));
my_errno=error;
DBUG_RETURN(1);
}
}
if (check_keybuffer)
VOID(_mi_test_if_changed(info));
info->invalidator=info->s->invalidator;
}
else if (lock_type == F_WRLCK && info->lock_type == F_RDLCK)
{
my_errno=EACCES; /* Not allowed to change */
DBUG_RETURN(-1); /* when have read_lock() */
}
DBUG_RETURN(0);
} /* _mi_readinfo */
/*
Every isam-function that uppdates the isam-database MUST end with this
request
*/
int _mi_writeinfo(register MI_INFO *info, uint operation)
{
int error,olderror;
MYISAM_SHARE *share=info->s;
DBUG_ENTER("_mi_writeinfo");
DBUG_PRINT("info",("operation: %u tot_locks: %u", operation,
share->tot_locks));
error=0;
if (share->tot_locks == 0)
{
olderror=my_errno; /* Remember last error */
if (operation)
{ /* Two threads can't be here */
share->state.process= share->last_process= share->this_process;
share->state.unique= info->last_unique= info->this_unique;
share->state.update_count= info->last_loop= ++info->this_loop;
if ((error=mi_state_info_write(share->kfile, &share->state, 1)))
olderror=my_errno;
#ifdef __WIN__
if (myisam_flush)
{
_commit(share->kfile);
_commit(info->dfile);
}
#endif
}
if (!(operation & WRITEINFO_NO_UNLOCK) &&
my_lock(share->kfile,F_UNLCK,0L,F_TO_EOF,
MYF(MY_WME | MY_SEEK_NOT_DONE)) && !error)
DBUG_RETURN(1);
my_errno=olderror;
}
else if (operation)
share->changed= 1; /* Mark keyfile changed */
DBUG_RETURN(error);
} /* _mi_writeinfo */
/* Test if someone has changed the database */
/* (Should be called after readinfo) */
int _mi_test_if_changed(register MI_INFO *info)
{
MYISAM_SHARE *share=info->s;
if (share->state.process != share->last_process ||
share->state.unique != info->last_unique ||
share->state.update_count != info->last_loop)
{ /* Keyfile has changed */
DBUG_PRINT("info",("index file changed"));
if (share->state.process != share->this_process)
VOID(flush_key_blocks(share->key_cache, share->kfile, FLUSH_RELEASE));
share->last_process=share->state.process;
info->last_unique= share->state.unique;
info->last_loop= share->state.update_count;
info->update|= HA_STATE_WRITTEN; /* Must use file on next */
info->data_changed= 1; /* For mi_is_changed */
return 1;
}
return (!(info->update & HA_STATE_AKTIV) ||
(info->update & (HA_STATE_WRITTEN | HA_STATE_DELETED |
HA_STATE_KEY_CHANGED)));
} /* _mi_test_if_changed */
/*
Put a mark in the .MYI file that someone is updating the table
DOCUMENTATION
state.open_count in the .MYI file is used the following way:
- For the first change of the .MYI file in this process open_count is
incremented by mi_mark_file_change(). (We have a write lock on the file
when this happens)
- In mi_close() it's decremented by _mi_decrement_open_count() if it
was incremented in the same process.
This mean that if we are the only process using the file, the open_count
tells us if the MYISAM file wasn't properly closed. (This is true if
my_disable_locking is set).
*/
int _mi_mark_file_changed(MI_INFO *info)
{
char buff[3];
register MYISAM_SHARE *share=info->s;
DBUG_ENTER("_mi_mark_file_changed");
if (!(share->state.changed & STATE_CHANGED) || ! share->global_changed)
{
share->state.changed|=(STATE_CHANGED | STATE_NOT_ANALYZED |
STATE_NOT_OPTIMIZED_KEYS);
if (!share->global_changed)
{
share->global_changed=1;
share->state.open_count++;
}
if (!share->temporary)
{
mi_int2store(buff,share->state.open_count);
buff[2]=1; /* Mark that it's changed */
DBUG_RETURN(my_pwrite(share->kfile,buff,sizeof(buff),
sizeof(share->state.header),
MYF(MY_NABP)));
}
}
DBUG_RETURN(0);
}
/*
This is only called by close or by extra(HA_FLUSH) if the OS has the pwrite()
call. In these context the following code should be safe!
*/
int _mi_decrement_open_count(MI_INFO *info)
{
char buff[2];
register MYISAM_SHARE *share=info->s;
int lock_error=0,write_error=0;
if (share->global_changed)
{
uint old_lock=info->lock_type;
share->global_changed=0;
lock_error=mi_lock_database(info,F_WRLCK);
/* Its not fatal even if we couldn't get the lock ! */
if (share->state.open_count > 0)
{
share->state.open_count--;
mi_int2store(buff,share->state.open_count);
write_error=my_pwrite(share->kfile,buff,sizeof(buff),
sizeof(share->state.header),
MYF(MY_NABP));
}
if (!lock_error)
lock_error=mi_lock_database(info,old_lock);
}
return test(lock_error || write_error);
}
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