uint64_t seq;
struct ldb_message *baseinfo;
+ /* a very fast check to avoid extra database reads */
+ if (ltdb->cache != NULL &&
+ tdb_get_seqnum(ltdb->tdb) == ltdb->tdb_seqnum) {
+ return 0;
+ }
+
if (ltdb->cache == NULL) {
ltdb->cache = talloc_zero(ltdb, struct ltdb_cache);
if (ltdb->cache == NULL) goto failed;
}
}
+ ltdb->tdb_seqnum = tdb_get_seqnum(ltdb->tdb);
+
/* if the current internal sequence number is the same as the one
in the database then assume the rest of the cache is OK */
seq = ldb_msg_find_attr_as_uint64(baseinfo, LTDB_SEQUENCE_NUMBER, 0);
return 1;
}
-/* the lock key for search locking. Note that this is not a DN, its
- just an arbitrary key to give to tdb. Also note that as we and
- using transactions for all write operations and transactions take
- care of their own locks, we don't need to do any locking anywhere
- other than in ldb_search() */
-#define LDBLOCK "INT_LDBLOCK"
-
/*
lock the database for read - use by ltdb_search
*/
static int ltdb_lock_read(struct ldb_module *module)
{
struct ltdb_private *ltdb = module->private_data;
- TDB_DATA key;
-
- key.dptr = discard_const(LDBLOCK);
- key.dsize = strlen(LDBLOCK);
-
- return tdb_chainlock_read(ltdb->tdb, key);
+ return tdb_lockall_read(ltdb->tdb);
}
/*
static int ltdb_unlock_read(struct ldb_module *module)
{
struct ltdb_private *ltdb = module->private_data;
- TDB_DATA key;
-
- key.dptr = discard_const(LDBLOCK);
- key.dsize = strlen(LDBLOCK);
-
- return tdb_chainunlock_read(ltdb->tdb, key);
+ return tdb_unlockall_read(ltdb->tdb);
}
/*
handling. It has plenty of digits of precision */
unsigned long long sequence_number;
+ /* the low level tdb seqnum - used to avoid loading BASEINFO when
+ possible */
+ int tdb_seqnum;
+
struct ltdb_cache {
struct ldb_message *indexlist;
struct ldb_message *attributes;