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Callers of translog_deassign_id_from_share() need intern_lock.

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Assert that keys don't point to bitmap pages.

storage/maria/ma_blockrec.h:
  assertion
storage/maria/ma_locking.c:
  With concurrent INSERTs, it is possible that two threads enter _ma_mark_file_changed()
  at the same time, so they should serialize their access to the "changed" state/share
  members; another reason is that this function may call _ma_update_state_lsns_sub()
  which may call translog_deassign_id_from_share() (I saw it during testing of
  online backup) which requires the intern_lock mutex.
  As INSERTs only change from "not changed" to "changed", we can first check without mutex:
  if it says "changed", some other thread has set or is setting the variables now,
  we don't need to do it; if it says "not changed", we serialize and re-check.
This commit is contained in:
Guilhem Bichot 2009-02-09 22:52:42 +01:00
parent 554eb6c2cf
commit 9653feb160
2 changed files with 15 additions and 4 deletions
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1
storage/maria/ma_blockrec.h
View File

@ -122,6 +122,7 @@ static inline MARIA_RECORD_POS ma_recordpos(pgcache_page_no_t page,
uint dir_entry)
{
DBUG_ASSERT(dir_entry <= 255);
DBUG_ASSERT(page > 0); /* page 0 is bitmap, not data page */
return (MARIA_RECORD_POS) (((ulonglong) page << 8) | dir_entry);
}

18
storage/maria/ma_locking.c
View File

@ -391,9 +391,15 @@ int _ma_mark_file_changed(MARIA_HA *info)
{
uchar buff[3];
register MARIA_SHARE *share= info->s;
int error= 1;
DBUG_ENTER("_ma_mark_file_changed");
if (!(share->state.changed & STATE_CHANGED) || ! share->global_changed)
#define _MA_ALREADY_MARKED_FILE_CHANGED \
((share->state.changed & STATE_CHANGED) && share->global_changed)
if (_MA_ALREADY_MARKED_FILE_CHANGED)
DBUG_RETURN(0);
pthread_mutex_lock(&share->intern_lock); /* recheck under mutex */
if (! _MA_ALREADY_MARKED_FILE_CHANGED)
{
share->state.changed|=(STATE_CHANGED | STATE_NOT_ANALYZED |
STATE_NOT_OPTIMIZED_KEYS);
@ -420,7 +426,7 @@ int _ma_mark_file_changed(MARIA_HA *info)
sizeof(share->state.header) +
MARIA_FILE_OPEN_COUNT_OFFSET,
MYF(MY_NABP)))
DBUG_RETURN(1);
goto err;
}
/* Set uuid of file if not yet set (zerofilled file) */
if (share->base.born_transactional &&
@ -432,11 +438,15 @@ int _ma_mark_file_changed(MARIA_HA *info)
_ma_update_state_lsns_sub(share, LSN_IMPOSSIBLE,
trnman_get_min_trid(),
TRUE, TRUE)))
DBUG_RETURN(1);
goto err;
share->state.changed|= STATE_NOT_MOVABLE;
}
}
DBUG_RETURN(0);
error= 0;
err:
pthread_mutex_unlock(&share->intern_lock);
DBUG_RETURN(error);
#undef _MA_ALREADY_MARKED_FILE_CHANGED
}
/*