dn2id.c

ldap服务器源码

	ID	nid;
	unsigned char dlen[2];

	DBTzero(&key);
	key.size = sizeof(ID);
	key.ulen = key.size;
	key.flags = DB_DBT_USERMEM;
	BDB_ID2DISK( eip->bei_id, &nid );

	DBTzero(&data);
	data.size = sizeof(diskNode) + BEI(e)->bei_nrdn.bv_len - sizeof(ID) - 1;
	data.ulen = data.size;
	data.dlen = data.size;
	data.flags = DB_DBT_USERMEM | DB_DBT_PARTIAL;

	key.data = &nid;
	rc = db->cursor( db, txn, &cursor, bdb->bi_db_opflags );
	if ( rc ) return rc;

	d = op->o_tmpalloc( data.size, op->o_tmpmemctx );
	d->nrdnlen[1] = BEI(e)->bei_nrdn.bv_len & 0xff;
	d->nrdnlen[0] = (BEI(e)->bei_nrdn.bv_len >> 8) | 0x80;
	dlen[0] = d->nrdnlen[0];
	dlen[1] = d->nrdnlen[1];
	strcpy( d->nrdn, BEI(e)->bei_nrdn.bv_val );
	data.data = d;

	/* Delete our ID from the parent's list */
	rc = cursor->c_get( cursor, &key, &data, DB_GET_BOTH_RANGE );
	if ( rc == 0 ) {
		if ( dlen[1] == d->nrdnlen[1] && dlen[0] == d->nrdnlen[0] &&
			!strcmp( d->nrdn, BEI(e)->bei_nrdn.bv_val ))
			rc = cursor->c_del( cursor, 0 );
		else
			rc = DB_NOTFOUND;
	}

	/* Delete our ID from the tree. With sorted duplicates, this
	 * will leave any child nodes still hanging around. This is OK
	 * for modrdn, which will add our info back in later.
	 */
	if ( rc == 0 ) {
		BDB_ID2DISK( e->e_id, &nid );
		rc = cursor->c_get( cursor, &key, &data, DB_SET );
		if ( rc == 0 )
			rc = cursor->c_del( cursor, 0 );
	}
	cursor->c_close( cursor );
	op->o_tmpfree( d, op->o_tmpmemctx );

	/* Delete IDL cache entries */
	if ( rc == 0 && bdb->bi_idl_cache_size ) {
		ID tmp[2];
		char *ptr = ((char *)&tmp[1])-1;
		key.data = ptr;
		key.size = sizeof(ID)+1;
		tmp[1] = eip->bei_id;
		*ptr = DN_ONE_PREFIX;
		bdb_idl_cache_del_id( bdb, db, &key, e->e_id );
		*ptr = DN_SUBTREE_PREFIX;
		for (; eip && eip->bei_parent->bei_id; eip = eip->bei_parent) {
			tmp[1] = eip->bei_id;
			bdb_idl_cache_del_id( bdb, db, &key, e->e_id );
		}
	}
	return rc;
}


int
hdb_dn2id(
	Operation	*op,
	DB_TXN *txn,
	struct berval	*in,
	EntryInfo	*ei )
{
	struct bdb_info *bdb = (struct bdb_info *) op->o_bd->be_private;
	DB *db = bdb->bi_dn2id->bdi_db;
	DBT		key, data;
	DBC	*cursor;
	int		rc = 0, nrlen;
	diskNode *d;
	char	*ptr;
	unsigned char dlen[2];
	ID idp, parentID;

	nrlen = dn_rdnlen( op->o_bd, in );
	if (!nrlen) nrlen = in->bv_len;

	DBTzero(&key);
	key.size = sizeof(ID);
	key.data = &idp;
	key.ulen = sizeof(ID);
	key.flags = DB_DBT_USERMEM;
	parentID = ( ei->bei_parent != NULL ) ? ei->bei_parent->bei_id : 0;
	BDB_ID2DISK( parentID, &idp );

	DBTzero(&data);
	data.size = sizeof(diskNode) + nrlen - sizeof(ID) - 1;
	data.ulen = data.size * 3;
	data.dlen = data.ulen;
	data.flags = DB_DBT_USERMEM | DB_DBT_PARTIAL;

	rc = db->cursor( db, txn, &cursor, bdb->bi_db_opflags );
	if ( rc ) return rc;

	d = op->o_tmpalloc( data.size * 3, op->o_tmpmemctx );
	d->nrdnlen[1] = nrlen & 0xff;
	d->nrdnlen[0] = (nrlen >> 8) | 0x80;
	dlen[0] = d->nrdnlen[0];
	dlen[1] = d->nrdnlen[1];
	ptr = lutil_strncopy( d->nrdn, in->bv_val, nrlen );
	*ptr = '\0';
	data.data = d;

	rc = cursor->c_get( cursor, &key, &data, DB_GET_BOTH_RANGE );
	if ( rc == 0 && (dlen[1] != d->nrdnlen[1] || dlen[0] != d->nrdnlen[0] ||
		strncmp( d->nrdn, in->bv_val, nrlen ))) {
		rc = DB_NOTFOUND;
	}
	if ( rc == 0 ) {
		ptr = (char *) data.data + data.size - sizeof(ID);
		BDB_DISK2ID( ptr, &ei->bei_id );
		ei->bei_rdn.bv_len = data.size - sizeof(diskNode) - nrlen;
		ptr = d->nrdn + nrlen + 1;
		ber_str2bv( ptr, ei->bei_rdn.bv_len, 1, &ei->bei_rdn );
		if ( ei->bei_parent != NULL && !ei->bei_parent->bei_dkids ) {
			db_recno_t dkids;
			/* How many children does the parent have? */
			/* FIXME: do we need to lock the parent
			 * entryinfo? Seems safe...
			 */
			cursor->c_count( cursor, &dkids, 0 );
			ei->bei_parent->bei_dkids = dkids;
		}
	}
	cursor->c_close( cursor );
	op->o_tmpfree( d, op->o_tmpmemctx );

	return rc;
}

int
hdb_dn2id_parent(
	Operation *op,
	DB_TXN *txn,
	u_int32_t	locker,
	EntryInfo *ei,
	ID *idp )
{
	struct bdb_info *bdb = (struct bdb_info *) op->o_bd->be_private;
	DB *db = bdb->bi_dn2id->bdi_db;
	DBT		key, data;
	DBC	*cursor;
	int		rc = 0;
	diskNode *d;
	char	*ptr;
	ID	nid;

	DBTzero(&key);
	key.size = sizeof(ID);
	key.data = &nid;
	key.ulen = sizeof(ID);
	key.flags = DB_DBT_USERMEM;
	BDB_ID2DISK( ei->bei_id, &nid );

	DBTzero(&data);
	data.flags = DB_DBT_USERMEM;

	rc = db->cursor( db, txn, &cursor, bdb->bi_db_opflags );
	if ( rc ) return rc;
	if ( !txn && locker ) {
		cursor->locker = locker;
	}

	data.ulen = sizeof(diskNode) + (SLAP_LDAPDN_MAXLEN * 2);
	d = op->o_tmpalloc( data.ulen, op->o_tmpmemctx );
	data.data = d;

	rc = cursor->c_get( cursor, &key, &data, DB_SET );
	if ( rc == 0 ) {
		if (d->nrdnlen[0] & 0x80) {
			rc = LDAP_OTHER;
		} else {
			db_recno_t dkids;
			ptr = (char *) data.data + data.size - sizeof(ID);
			BDB_DISK2ID( ptr, idp );
			ei->bei_nrdn.bv_len = (d->nrdnlen[0] << 8) | d->nrdnlen[1];
			ber_str2bv( d->nrdn, ei->bei_nrdn.bv_len, 1, &ei->bei_nrdn );
			ei->bei_rdn.bv_len = data.size - sizeof(diskNode) -
				ei->bei_nrdn.bv_len;
			ptr = d->nrdn + ei->bei_nrdn.bv_len + 1;
			ber_str2bv( ptr, ei->bei_rdn.bv_len, 1, &ei->bei_rdn );
			/* How many children does this node have? */
			cursor->c_count( cursor, &dkids, 0 );
			ei->bei_dkids = dkids;
		}
	}
	cursor->c_close( cursor );
	op->o_tmpfree( d, op->o_tmpmemctx );
	return rc;
}

int
hdb_dn2id_children(
	Operation *op,
	DB_TXN *txn,
	Entry *e )
{
	struct bdb_info *bdb = (struct bdb_info *) op->o_bd->be_private;
	DB *db = bdb->bi_dn2id->bdi_db;
	DBT		key, data;
	DBC		*cursor;
	int		rc;
	ID		id;
	diskNode d;

	DBTzero(&key);
	key.size = sizeof(ID);
	key.data = &e->e_id;
	key.flags = DB_DBT_USERMEM;
	BDB_ID2DISK( e->e_id, &id );

	/* IDL cache is in host byte order */
	if ( bdb->bi_idl_cache_size ) {
		rc = bdb_idl_cache_get( bdb, db, &key, NULL );
		if ( rc != LDAP_NO_SUCH_OBJECT ) {
			return rc;
		}
	}

	key.data = &id;
	DBTzero(&data);
	data.data = &d;
	data.ulen = sizeof(d);
	data.flags = DB_DBT_USERMEM | DB_DBT_PARTIAL;
	data.dlen = sizeof(d);

	rc = db->cursor( db, txn, &cursor, bdb->bi_db_opflags );
	if ( rc ) return rc;

	rc = cursor->c_get( cursor, &key, &data, DB_SET );
	if ( rc == 0 ) {
		db_recno_t dkids;
		rc = cursor->c_count( cursor, &dkids, 0 );
		if ( rc == 0 ) {
			BEI(e)->bei_dkids = dkids;
			if ( dkids < 2 ) rc = DB_NOTFOUND;
		}
	}
	cursor->c_close( cursor );
	return rc;
}

/* bdb_dn2idl:
 * We can't just use bdb_idl_fetch_key because
 * 1 - our data items are longer than just an entry ID
 * 2 - our data items are sorted alphabetically by nrdn, not by ID.
 *
 * We descend the tree recursively, so we define this cookie
 * to hold our necessary state information. The bdb_dn2idl_internal
 * function uses this cookie when calling itself.
 */

struct dn2id_cookie {
	struct bdb_info *bdb;
	Operation *op;
	EntryInfo *ei;
	ID *ids;
	ID *tmp;
	ID *buf;
	DB *db;
	DBC *dbc;
	DBT key;
	DBT data;
	ID dbuf;
	ID id;
	ID nid;
	int rc;
	int depth;
	char need_sort;
	char prefix;
};

static int
apply_func(
	void *data,
	void *arg )
{
	EntryInfo *ei = data;
	ID *idl = arg;

	bdb_idl_append_one( idl, ei->bei_id );
	return 0;
}

static int
hdb_dn2idl_internal(
	struct dn2id_cookie *cx
)
{
	BDB_IDL_ZERO( cx->tmp );

	if ( cx->bdb->bi_idl_cache_size ) {
		char *ptr = ((char *)&cx->id)-1;

		cx->key.data = ptr;
		cx->key.size = sizeof(ID)+1;
		if ( cx->prefix == DN_SUBTREE_PREFIX ) {
			ID *ids = cx->depth ? cx->tmp : cx->ids;
			*ptr = cx->prefix;
			cx->rc = bdb_idl_cache_get(cx->bdb, cx->db, &cx->key, ids);
			if ( cx->rc == LDAP_SUCCESS ) {
				if ( cx->depth ) {
					bdb_idl_append( cx->ids, cx->tmp );
					cx->need_sort = 1;
				}
				return cx->rc;
			}
		}
		*ptr = DN_ONE_PREFIX;
		cx->rc = bdb_idl_cache_get(cx->bdb, cx->db, &cx->key, cx->tmp);
		if ( cx->rc == LDAP_SUCCESS ) {
			goto gotit;
		}
		if ( cx->rc == DB_NOTFOUND ) {
			return cx->rc;
		}
	}

	bdb_cache_entryinfo_lock( cx->ei );

	/* If number of kids in the cache differs from on-disk, load
	 * up all the kids from the database
	 */
	if ( cx->ei->bei_ckids+1 != cx->ei->bei_dkids ) {
		EntryInfo ei;
		db_recno_t dkids = cx->ei->bei_dkids;
		ei.bei_parent = cx->ei;

		/* Only one thread should load the cache */
		while ( cx->ei->bei_state & CACHE_ENTRY_ONELEVEL ) {
			bdb_cache_entryinfo_unlock( cx->ei );
			ldap_pvt_thread_yield();
			bdb_cache_entryinfo_lock( cx->ei );
			if ( cx->ei->bei_ckids+1 == cx->ei->bei_dkids ) {
				goto synced;
			}
		}

		cx->ei->bei_state |= CACHE_ENTRY_ONELEVEL;

		bdb_cache_entryinfo_unlock( cx->ei );

		cx->rc = cx->db->cursor( cx->db, NULL, &cx->dbc,
			cx->bdb->bi_db_opflags );
		if ( cx->rc )
			goto done_one;

		cx->data.data = &cx->dbuf;
		cx->data.ulen = sizeof(ID);
		cx->data.dlen = sizeof(ID);
		cx->data.flags = DB_DBT_USERMEM | DB_DBT_PARTIAL;

		/* The first item holds the parent ID. Ignore it. */
		cx->key.data = &cx->nid;
		cx->key.size = sizeof(ID);
		cx->rc = cx->dbc->c_get( cx->dbc, &cx->key, &cx->data, DB_SET );
		if ( cx->rc ) {
			cx->dbc->c_close( cx->dbc );
			goto done_one;
		}

		/* If the on-disk count is zero we've never checked it.
		 * Count it now.
		 */
		if ( !dkids ) {
			cx->dbc->c_count( cx->dbc, &dkids, 0 );
			cx->ei->bei_dkids = dkids;
		}

		cx->data.data = cx->buf;
		cx->data.ulen = BDB_IDL_UM_SIZE * sizeof(ID);
		cx->data.flags = DB_DBT_USERMEM;

		if ( dkids > 1 ) {
			/* Fetch the rest of the IDs in a loop... */
			while ( (cx->rc = cx->dbc->c_get( cx->dbc, &cx->key, &cx->data,
				DB_MULTIPLE | DB_NEXT_DUP )) == 0 ) {
				u_int8_t *j;
				size_t len;
				void *ptr;
				DB_MULTIPLE_INIT( ptr, &cx->data );
				while (ptr) {
					DB_MULTIPLE_NEXT( ptr, &cx->data, j, len );
					if (j) {
						EntryInfo *ei2;
						diskNode *d = (diskNode *)j;
						short nrlen;

						BDB_DISK2ID( j + len - sizeof(ID), &ei.bei_id );
						nrlen = ((d->nrdnlen[0] ^ 0x80) << 8) | d->nrdnlen[1];
						ei.bei_nrdn.bv_len = nrlen;
						/* nrdn/rdn are set in-place.
						 * hdb_cache_load will copy them as needed
						 */
						ei.bei_nrdn.bv_val = d->nrdn;
						ei.bei_rdn.bv_len = len - sizeof(diskNode)
							- ei.bei_nrdn.bv_len;
						ei.bei_rdn.bv_val = d->nrdn + ei.bei_nrdn.bv_len + 1;
						bdb_idl_append_one( cx->tmp, ei.bei_id );
						hdb_cache_load( cx->bdb, &ei, &ei2 );
					}
				}
			}
		}

		cx->rc = cx->dbc->c_close( cx->dbc );
done_one:
		bdb_cache_entryinfo_lock( cx->ei );
		cx->ei->bei_state ^= CACHE_ENTRY_ONELEVEL;
		bdb_cache_entryinfo_unlock( cx->ei );
		if ( cx->rc )
			return cx->rc;

	} else {
		/* The in-memory cache is in sync with the on-disk data.
		 * do we have any kids?
		 */
synced:
		cx->rc = 0;
		if ( cx->ei->bei_ckids > 0 ) {
			/* Walk the kids tree; order is irrelevant since bdb_idl_sort
			 * will sort it later.
			 */
			avl_apply( cx->ei->bei_kids, apply_func,
				cx->tmp, -1, AVL_POSTORDER );
		}
		bdb_cache_entryinfo_unlock( cx->ei );
	}

	if ( !BDB_IDL_IS_RANGE( cx->tmp ) && cx->tmp[0] > 3 )
		bdb_idl_sort( cx->tmp, cx->buf );
	if ( cx->bdb->bi_idl_cache_max_size && !BDB_IDL_IS_ZERO( cx->tmp )) {
		char *ptr = ((char *)&cx->id)-1;
		cx->key.data = ptr;
		cx->key.size = sizeof(ID)+1;
		*ptr = DN_ONE_PREFIX;
		bdb_idl_cache_put( cx->bdb, cx->db, &cx->key, cx->tmp, cx->rc );
	}

gotit:
	if ( !BDB_IDL_IS_ZERO( cx->tmp )) {
		if ( cx->prefix == DN_SUBTREE_PREFIX ) {
			bdb_idl_append( cx->ids, cx->tmp );
			cx->need_sort = 1;
			if ( !(cx->ei->bei_state & CACHE_ENTRY_NO_GRANDKIDS)) {
				ID *save, idcurs;
				EntryInfo *ei = cx->ei;
				int nokids = 1;
				save = cx->op->o_tmpalloc( BDB_IDL_SIZEOF( cx->tmp ),
					cx->op->o_tmpmemctx );
				BDB_IDL_CPY( save, cx->tmp );

				idcurs = 0;
				cx->depth++;
				for ( cx->id = bdb_idl_first( save, &idcurs );
					cx->id != NOID;
					cx->id = bdb_idl_next( save, &idcurs )) {
					cx->ei = bdb_cache_find_info( cx->bdb, cx->id );
					if ( !cx->ei ||
						( cx->ei->bei_state & CACHE_ENTRY_NO_KIDS ))
						continue;

					BDB_ID2DISK( cx->id, &cx->nid );
					hdb_dn2idl_internal( cx );
					if ( !BDB_IDL_IS_ZERO( cx->tmp ))
						nokids = 0;
				}
				cx->depth--;
				cx->op->o_tmpfree( save, cx->op->o_tmpmemctx );
				if ( nokids ) ei->bei_state |= CACHE_ENTRY_NO_GRANDKIDS;
			}
			/* Make sure caller knows it had kids! */
			cx->tmp[0]=1;

			cx->rc = 0;
		} else {
			BDB_IDL_CPY( cx->ids, cx->tmp );
		}
	}
	return cx->rc;
}

int
hdb_dn2idl(
	Operation	*op,
	Entry		*e,
	ID *ids,
	ID *stack )
{
	struct bdb_info *bdb = (struct bdb_info *)op->o_bd->be_private;
	struct dn2id_cookie cx;

	Debug( LDAP_DEBUG_TRACE, "=> hdb_dn2idl(\"%s\")\n",
		e->e_nname.bv_val, 0, 0 );

#ifndef BDB_MULTIPLE_SUFFIXES
	if ( op->ors_scope != LDAP_SCOPE_ONELEVEL && 
		BEI(e)->bei_parent->bei_id == 0 )
	{
		BDB_IDL_ALL( bdb, ids );
		return 0;
	}
#endif

	cx.id = e->e_id;
	BDB_ID2DISK( cx.id, &cx.nid );
	cx.ei = e->e_id ? BEI(e) : &bdb->bi_cache.c_dntree;
	cx.bdb = bdb;
	cx.db = cx.bdb->bi_dn2id->bdi_db;
	cx.prefix = (op->ors_scope == LDAP_SCOPE_ONELEVEL) ?
		DN_ONE_PREFIX : DN_SUBTREE_PREFIX;
	cx.ids = ids;
	cx.tmp = stack;
	cx.buf = stack + BDB_IDL_UM_SIZE;
	cx.op = op;
	cx.need_sort = 0;
	cx.depth = 0;

	if ( cx.prefix == DN_SUBTREE_PREFIX ) {
		ids[0] = 1;
		ids[1] = cx.id;
	} else {
		BDB_IDL_ZERO( ids );
	}
	if ( cx.ei->bei_state & CACHE_ENTRY_NO_KIDS )
		return LDAP_SUCCESS;

	DBTzero(&cx.key);
	cx.key.ulen = sizeof(ID);
	cx.key.size = sizeof(ID);
	cx.key.flags = DB_DBT_USERMEM;

	DBTzero(&cx.data);

	hdb_dn2idl_internal(&cx);
	if ( cx.need_sort ) {
		char *ptr = ((char *)&cx.id)-1;
		if ( !BDB_IDL_IS_RANGE( cx.ids ) && cx.ids[0] > 3 ) 
			bdb_idl_sort( cx.ids, cx.tmp );
		cx.key.data = ptr;
		cx.key.size = sizeof(ID)+1;
		*ptr = cx.prefix;
		cx.id = e->e_id;
		bdb_idl_cache_put( cx.bdb, cx.db, &cx.key, cx.ids, cx.rc );
	}

	if ( cx.rc == DB_NOTFOUND )
		cx.rc = LDAP_SUCCESS;

	return cx.rc;
}
#endif	/* BDB_HIER */