Re: Move SLAPI in an overlay...

[Luke Howard <lukeh@padl.com>]

Does it make sense to provide frontend support for entry_get_rw()
too? If an overlay wants to call be_entry_get_rw() it won't work 
unless it sets up the environment itself. I was thinking of:

int
fe_entry_get_rw(
        Operation *op,
        struct berval *ndn,
        ObjectClass *oc,
        AttributeDescription *at,
        int rw,
        Entry **e )
{
        BackendDB               *be_orig = op->o_bd;
        int                     rc;

        if ( be_orig == NULL ) {
                return LDAP_NO_SUCH_OBJECT;
        }

        op->o_bd = select_backend( ndn, 0, 0 );

        if ( op->o_bd->be_fetch ) {
                rc = op->o_bd->be_fetch( op, ndn, oc, at, rw, e );
        } else {
                rc = LDAP_UNWILLING_TO_PERFORM;
        }

        op->o_bd = be_orig;

        return rc;
}

int
be_entry_get_rw(
        Operation *op,
        struct berval *ndn,
        ObjectClass *oc,
        AttributeDescription *at,
        int rw,
        Entry **e )
{
        int                     rc;
        BackendDB               *be_orig;

        if ( op->o_abandon ) {
                return SLAPD_ABANDON;
        }

        be_orig = op->o_bd;
        op->o_bd = frontendDB;
        rc = frontendDB->be_fetch( op, ndn, oc, at, rw, e );
        op->o_bd = be_orig;

        return rc;
}

But I wonder what kind of performance cost this might exact.

-- Luke
--