text: /* delete.cpp - ndb backend delete routine */
  /* $OpenLDAP: pkg/ldap/servers/slapd/back-ndb/delete.cpp,v 1.3.2.5 2011/01/04 23:50:39 kurt Exp $ */
  /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   *
   * Copyright 2008-2011 The OpenLDAP Foundation.
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted only as authorized by the OpenLDAP
   * Public License.
   *
   * A copy of this license is available in the file LICENSE in the
   * top-level directory of the distribution or, alternatively, at
   * <http://www.OpenLDAP.org/license.html>.
   */
  /* ACKNOWLEDGEMENTS:
   * This work was initially developed by Howard Chu for inclusion
   * in OpenLDAP Software. This work was sponsored by MySQL.
   */
  
  #include "portable.h"
  
  #include <stdio.h>
  #include <ac/string.h>
  
  #include "lutil.h"
  #include "back-ndb.h"
  
  static struct berval glue_bv = BER_BVC("glue");
  
  int
  ndb_back_delete( Operation *op, SlapReply *rs )
  {
  	struct ndb_info *ni = (struct ndb_info *) op->o_bd->be_private;
  	Entry	e = {0};
  	Entry	p = {0};
  	int		manageDSAit = get_manageDSAit( op );
  	AttributeDescription *children = slap_schema.si_ad_children;
  	AttributeDescription *entry = slap_schema.si_ad_entry;
  
  	NdbArgs NA;
  	NdbRdns rdns;
  	struct berval matched;
  
  	int	num_retries = 0;
  
  	int     rc;
  
  	LDAPControl **preread_ctrl = NULL;
  	LDAPControl *ctrls[SLAP_MAX_RESPONSE_CONTROLS];
  	int num_ctrls = 0;
  
  	Debug( LDAP_DEBUG_ARGS, "==> " LDAP_XSTRING(ndb_back_delete) ": %s\n",
  		op->o_req_dn.bv_val, 0, 0 );
  
  	ctrls[num_ctrls] = 0;
  
  	/* allocate CSN */
  	if ( BER_BVISNULL( &op->o_csn ) ) {
  		struct berval csn;
  		char csnbuf[LDAP_PVT_CSNSTR_BUFSIZE];
  
  		csn.bv_val = csnbuf;
  		csn.bv_len = sizeof(csnbuf);
  		slap_get_csn( op, &csn, 1 );
  	}
  
  	if ( !be_issuffix( op->o_bd, &op->o_req_ndn ) ) {
  		dnParent( &op->o_req_dn, &p.e_name );
  		dnParent( &op->o_req_ndn, &p.e_nname );
  	}
  
  	/* Get our NDB handle */
  	rs->sr_err = ndb_thread_handle( op, &NA.ndb );
  	rdns.nr_num = 0;
  	NA.rdns = &rdns;
  	NA.ocs = NULL;
  	NA.e = &e;
  	e.e_name = op->o_req_dn;
  	e.e_nname = op->o_req_ndn;
  
  	if( 0 ) {
  retry:	/* transaction retry */
  		NA.txn->close();
  		NA.txn = NULL;
  		Debug( LDAP_DEBUG_TRACE,
  			"==> " LDAP_XSTRING(ndb_back_delete) ": retrying...\n",
  			0, 0, 0 );
  		if ( op->o_abandon ) {
  			rs->sr_err = SLAPD_ABANDON;
  			goto return_results;
  		}
  		if ( NA.ocs ) {
  			ber_bvarray_free( NA.ocs );
  			NA.ocs = NULL;
  		}
  		ndb_trans_backoff( ++num_retries );
  	}
  
  	/* begin transaction */
  	NA.txn = NA.ndb->startTransaction();
  	rs->sr_text = NULL;
  	if( !NA.txn ) {
  		Debug( LDAP_DEBUG_TRACE,
  			LDAP_XSTRING(ndb_back_delete) ": startTransaction failed: %s (%d)\n",
  			NA.ndb->getNdbError().message, NA.ndb->getNdbError().code, 0 );
  		rs->sr_err = LDAP_OTHER;
  		rs->sr_text = "internal error";
  		goto return_results;
  	}
  
  	/* get entry */
  	rs->sr_err = ndb_entry_get_info( op, &NA, 1, &matched );
  	switch( rs->sr_err ) {
  	case 0:
  	case LDAP_NO_SUCH_OBJECT:
  		break;
  #if 0
  	case DB_LOCK_DEADLOCK:
  	case DB_LOCK_NOTGRANTED:
  		goto retry;
  #endif
  	case LDAP_BUSY:
  		rs->sr_text = "ldap server busy";
  		goto return_results;
  	default:
  		rs->sr_err = LDAP_OTHER;
  		rs->sr_text = "internal error";
  		goto return_results;
  	}
  
  	if ( rs->sr_err == LDAP_NO_SUCH_OBJECT ||
  		( !manageDSAit && bvmatch( NA.ocs, &glue_bv ))) {
  		Debug( LDAP_DEBUG_ARGS,
  			"<=- " LDAP_XSTRING(ndb_back_delete) ": no such object %s\n",
  			op->o_req_dn.bv_val, 0, 0);
  
  		if ( rs->sr_err == LDAP_NO_SUCH_OBJECT ) {
  			rs->sr_matched = matched.bv_val;
  			if ( NA.ocs )
  				ndb_check_referral( op, rs, &NA );
  		} else {
  			rs->sr_matched = p.e_name.bv_val;
  			rs->sr_err = LDAP_NO_SUCH_OBJECT;
  		}
  		goto return_results;
  	}
  
  	/* check parent for "children" acl */
  	rs->sr_err = access_allowed( op, &p,
  		children, NULL, ACL_WDEL, NULL );
  
  	if ( !rs->sr_err  ) {
  		Debug( LDAP_DEBUG_TRACE,
  			"<=- " LDAP_XSTRING(ndb_back_delete) ": no write "
  			"access to parent\n", 0, 0, 0 );
  		rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
  		rs->sr_text = "no write access to parent";
  		goto return_results;
  	}
  
  	rs->sr_err = ndb_entry_get_data( op, &NA, 1 );
  
  	rs->sr_err = access_allowed( op, &e,
  		entry, NULL, ACL_WDEL, NULL );
  
  	if ( !rs->sr_err  ) {
  		Debug( LDAP_DEBUG_TRACE,
  			"<=- " LDAP_XSTRING(ndb_back_delete) ": no write access "
  			"to entry\n", 0, 0, 0 );
  		rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
  		rs->sr_text = "no write access to entry";
  		goto return_results;
  	}
  
  	if ( !manageDSAit && is_entry_referral( &e ) ) {
  		/* entry is a referral, don't allow delete */
  		rs->sr_ref = get_entry_referrals( op, &e );
  
  		Debug( LDAP_DEBUG_TRACE,
  			LDAP_XSTRING(ndb_back_delete) ": entry is referral\n",
  			0, 0, 0 );
  
  		rs->sr_err = LDAP_REFERRAL;
  		rs->sr_matched = e.e_name.bv_val;
  		rs->sr_flags = REP_REF_MUSTBEFREED;
  		goto return_results;
  	}
  
  	if ( get_assert( op ) &&
  		( test_filter( op, &e, (Filter *)get_assertion( op )) != LDAP_COMPARE_TRUE ))
  	{
  		rs->sr_err = LDAP_ASSERTION_FAILED;
  		goto return_results;
  	}
  
  	/* pre-read */
  	if( op->o_preread ) {
  		if( preread_ctrl == NULL ) {
  			preread_ctrl = &ctrls[num_ctrls++];
  			ctrls[num_ctrls] = NULL;
  		}
  		if( slap_read_controls( op, rs, &e,
  			&slap_pre_read_bv, preread_ctrl ) )
  		{
  			Debug( LDAP_DEBUG_TRACE,
  				"<=- " LDAP_XSTRING(ndb_back_delete) ": pre-read "
  				"failed!\n", 0, 0, 0 );
  			if ( op->o_preread & SLAP_CONTROL_CRITICAL ) {
  				/* FIXME: is it correct to abort
  				 * operation if control fails? */
  				goto return_results;
  			}
  		}
  	}
  
  	/* Can't do it if we have kids */
  	rs->sr_err = ndb_has_children( &NA, &rc );
  	if ( rs->sr_err ) {
  		Debug(LDAP_DEBUG_ARGS,
  			"<=- " LDAP_XSTRING(ndb_back_delete)
  			": has_children failed: %s (%d)\n",
  			NA.txn->getNdbError().message, NA.txn->getNdbError().code, 0 );
  		rs->sr_err = LDAP_OTHER;
  		rs->sr_text = "internal error";
  		goto return_results;
  	}
  	if ( rc == LDAP_COMPARE_TRUE ) {
  		Debug(LDAP_DEBUG_ARGS,
  			"<=- " LDAP_XSTRING(ndb_back_delete)
  			": non-leaf %s\n",
  			op->o_req_dn.bv_val, 0, 0);
  		rs->sr_err = LDAP_NOT_ALLOWED_ON_NONLEAF;
  		rs->sr_text = "subordinate objects must be deleted first";
  		goto return_results;
  	}
  
  	/* delete info */
  	rs->sr_err = ndb_entry_del_info( op->o_bd, &NA );
  	if ( rs->sr_err != 0 ) {
  		Debug(LDAP_DEBUG_TRACE,
  			"<=- " LDAP_XSTRING(ndb_back_delete) ": del_info failed: %s (%d)\n",
  			NA.txn->getNdbError().message, NA.txn->getNdbError().code, 0 );
  		rs->sr_text = "DN index delete failed";
  		rs->sr_err = LDAP_OTHER;
  		goto return_results;
  	}
  
  	/* delete data */
  	rs->sr_err = ndb_entry_del_data( op->o_bd, &NA );
  	if ( rs->sr_err != 0 ) {
  		Debug( LDAP_DEBUG_TRACE,
  			"<=- " LDAP_XSTRING(ndb_back_delete) ": del_data failed: %s (%d)\n",
  			NA.txn->getNdbError().message, NA.txn->getNdbError().code, 0 );
  		rs->sr_text = "entry delete failed";
  		rs->sr_err = LDAP_OTHER;
  		goto return_results;
  	}
  
  	if( op->o_noop ) {
  		if (( rs->sr_err=NA.txn->execute( NdbTransaction::Rollback,
  			NdbOperation::AbortOnError, 1 )) != 0 ) {
  			rs->sr_text = "txn (no-op) failed";
  		} else {
  			rs->sr_err = LDAP_X_NO_OPERATION;
  		}
  	} else {
  		if (( rs->sr_err=NA.txn->execute( NdbTransaction::Commit,
  			NdbOperation::AbortOnError, 1 )) != 0 ) {
  			rs->sr_text = "txn_commit failed";
  		} else {
  			rs->sr_err = LDAP_SUCCESS;
  		}
  	}
  
  	if( rs->sr_err != LDAP_SUCCESS && rs->sr_err != LDAP_X_NO_OPERATION ) {
  		Debug( LDAP_DEBUG_TRACE,
  			LDAP_XSTRING(ndb_back_delete) ": txn_%s failed: %s (%d)\n",
  			op->o_noop ? "abort (no-op)" : "commit",
  			NA.txn->getNdbError().message, NA.txn->getNdbError().code );
  		rs->sr_err = LDAP_OTHER;
  		rs->sr_text = "commit failed";
  
  		goto return_results;
  	}
  	NA.txn->close();
  	NA.txn = NULL;
  
  	Debug( LDAP_DEBUG_TRACE,
  		LDAP_XSTRING(ndb_back_delete) ": deleted%s id=%08lx dn=\"%s\"\n",
  		op->o_noop ? " (no-op)" : "",
  		e.e_id, op->o_req_dn.bv_val );
  	rs->sr_err = LDAP_SUCCESS;
  	rs->sr_text = NULL;
  	if( num_ctrls ) rs->sr_ctrls = ctrls;
  
  return_results:
  	if ( NA.ocs ) {
  		ber_bvarray_free_x( NA.ocs, op->o_tmpmemctx );
  		NA.ocs = NULL;
  	}
  
  	/* free entry */
  	if( e.e_attrs != NULL ) {
  		attrs_free( e.e_attrs );
  		e.e_attrs = NULL;
  	}
  
  	if( NA.txn != NULL ) {
  		NA.txn->execute( Rollback );
  		NA.txn->close();
  	}
  
  	send_ldap_result( op, rs );
  	slap_graduate_commit_csn( op );
  
  	if( preread_ctrl != NULL && (*preread_ctrl) != NULL ) {
  		slap_sl_free( (*preread_ctrl)->ldctl_value.bv_val, op->o_tmpmemctx );
  		slap_sl_free( *preread_ctrl, op->o_tmpmemctx );
  	}
  	return rs->sr_err;
  }
  