/* modify.c - bdb backend modify routine */
/* $OpenLDAP$ */
/*
 * Copyright 1998-2003 The OpenLDAP Foundation, All Rights Reserved.
 * COPYING RESTRICTIONS APPLY, see COPYRIGHT file
 */

#include "portable.h"

#include <stdio.h>
#include <ac/string.h>
#include <ac/time.h>

#include "back-bdb.h"
#include "external.h"

#define INDEXED	0x2000
#define NULLIFIED	0x4000

int bdb_modify_internal(
	Operation *op,
	DB_TXN *tid,
	Modifications *modlist,
	Entry *e,
	const char **text,
	char *textbuf,
	size_t textlen )
{
	int rc, err;
	Modification	*mod;
	Modifications	*ml;
	Attribute	*save_attrs;
	Attribute 	*ap;

#ifdef NEW_LOGGING
	LDAP_LOG ( OPERATION, ENTRY, "bdb_modify_internal: 0x%08lx: %s\n", 
		e->e_id, e->e_dn, 0 );
#else
	Debug( LDAP_DEBUG_TRACE, "bdb_modify_internal: 0x%08lx: %s\n",
		e->e_id, e->e_dn, 0);
#endif

	if ( !acl_check_modlist( op, e, modlist )) {
		return LDAP_INSUFFICIENT_ACCESS;
	}

	/* save_attrs will be disposed of by bdb_cache_modify */
	save_attrs = e->e_attrs;
	e->e_attrs = attrs_dup( e->e_attrs );

	for ( ml = modlist; ml != NULL; ml = ml->sml_next ) {
		mod = &ml->sml_mod;

		switch ( mod->sm_op ) {
		case LDAP_MOD_ADD:
#ifdef NEW_LOGGING
			LDAP_LOG ( OPERATION, DETAIL1, "bdb_modify_internal: add\n", 0,0,0);
#else
			Debug(LDAP_DEBUG_ARGS, "bdb_modify_internal: add\n", 0, 0, 0);
#endif
			err = modify_add_values( e, mod, get_permissiveModify(op),
				text, textbuf, textlen );
			if( err != LDAP_SUCCESS ) {
#ifdef NEW_LOGGING
				LDAP_LOG ( OPERATION, ERR, 
					"bdb_modify_internal: %d %s\n", err, *text, 0 );
#else
				Debug(LDAP_DEBUG_ARGS, "bdb_modify_internal: %d %s\n",
					err, *text, 0);
#endif
			}
			break;

		case LDAP_MOD_DELETE:
#ifdef NEW_LOGGING
			LDAP_LOG ( OPERATION, DETAIL1, 
				"bdb_modify_internal: delete\n", 0, 0, 0 );
#else
			Debug(LDAP_DEBUG_ARGS, "bdb_modify_internal: delete\n", 0, 0, 0);
#endif
			err = modify_delete_values( e, mod, get_permissiveModify(op),
				text, textbuf, textlen );
			assert( err != LDAP_TYPE_OR_VALUE_EXISTS );
			if( err != LDAP_SUCCESS ) {
#ifdef NEW_LOGGING
				LDAP_LOG ( OPERATION, ERR, 
					"bdb_modify_internal: %d %s\n", err, *text, 0 );
#else
				Debug(LDAP_DEBUG_ARGS, "bdb_modify_internal: %d %s\n",
					err, *text, 0);
#endif
			}
			break;

		case LDAP_MOD_REPLACE:
#ifdef NEW_LOGGING
			LDAP_LOG ( OPERATION, DETAIL1, 
				"bdb_modify_internal: replace\n", 0, 0, 0 );
#else
			Debug(LDAP_DEBUG_ARGS, "bdb_modify_internal: replace\n", 0, 0, 0);
#endif
			err = modify_replace_values( e, mod, get_permissiveModify(op),
				text, textbuf, textlen );
			if( err != LDAP_SUCCESS ) {
#ifdef NEW_LOGGING
				LDAP_LOG ( OPERATION, ERR, 
					"bdb_modify_internal: %d %s\n", err, *text, 0 );
#else
				Debug(LDAP_DEBUG_ARGS, "bdb_modify_internal: %d %s\n",
					err, *text, 0);
#endif
			}
			break;

		case LDAP_MOD_INCREMENT:
#ifdef NEW_LOGGING
			LDAP_LOG ( OPERATION, DETAIL1, 
				"bdb_modify_internal: increment\n", 0, 0, 0 );
#else
			Debug(LDAP_DEBUG_ARGS,
				"bdb_modify_internal: increment\n", 0, 0, 0);
#endif
			err = modify_increment_values( e, mod, get_permissiveModify(op),
				text, textbuf, textlen );
			if( err != LDAP_SUCCESS ) {
#ifdef NEW_LOGGING
				LDAP_LOG ( OPERATION, ERR, 
					"bdb_modify_internal: %d %s\n", err, *text, 0 );
#else
				Debug(LDAP_DEBUG_ARGS,
					"bdb_modify_internal: %d %s\n",
					err, *text, 0);
#endif
			}
			break;

		case SLAP_MOD_SOFTADD:
#ifdef NEW_LOGGING
			LDAP_LOG ( OPERATION, DETAIL1, 
				"bdb_modify_internal: softadd\n",0,0,0 );
#else
			Debug(LDAP_DEBUG_ARGS, "bdb_modify_internal: softadd\n", 0, 0, 0);
#endif
 			/* Avoid problems in index_add_mods()
 			 * We need to add index if necessary.
 			 */
 			mod->sm_op = LDAP_MOD_ADD;

			err = modify_add_values( e, mod, get_permissiveModify(op),
				text, textbuf, textlen );

 			mod->sm_op = SLAP_MOD_SOFTADD;

 			if ( err == LDAP_TYPE_OR_VALUE_EXISTS ) {
 				err = LDAP_SUCCESS;
 			}

			if( err != LDAP_SUCCESS ) {
#ifdef NEW_LOGGING
				LDAP_LOG ( OPERATION, ERR, 
					"bdb_modify_internal: %d %s\n", err, *text, 0 );
#else
				Debug(LDAP_DEBUG_ARGS, "bdb_modify_internal: %d %s\n",
					err, *text, 0);
#endif
			}
 			break;

		default:
#ifdef NEW_LOGGING
				LDAP_LOG ( OPERATION, ERR, 
					"bdb_modify_internal: invalid op %d\n", mod->sm_op, 0, 0 );
#else
			Debug(LDAP_DEBUG_ANY, "bdb_modify_internal: invalid op %d\n",
				mod->sm_op, 0, 0);
#endif
			*text = "Invalid modify operation";
			err = LDAP_OTHER;
#ifdef NEW_LOGGING
				LDAP_LOG ( OPERATION, ERR, 
					"bdb_modify_internal: %d %s\n", err, *text, 0 );
#else
			Debug(LDAP_DEBUG_ARGS, "bdb_modify_internal: %d %s\n",
				err, *text, 0);
#endif
		}

		if ( err != LDAP_SUCCESS ) {
			attrs_free( e->e_attrs );
			e->e_attrs = save_attrs;
			/* unlock entry, delete from cache */
			return err; 
		}

		/* If objectClass was modified, reset the flags */
		if ( mod->sm_desc == slap_schema.si_ad_objectClass ) {
			e->e_ocflags = 0;
		}
	}

	/* check that the entry still obeys the schema */
	rc = entry_schema_check( op->o_bd, e, save_attrs, text, textbuf, textlen );
	if ( rc != LDAP_SUCCESS || op->o_noop ) {
		attrs_free( e->e_attrs );
		e->e_attrs = save_attrs;

		if ( rc != LDAP_SUCCESS ) {
#ifdef NEW_LOGGING
			LDAP_LOG ( OPERATION, ERR, "bdb_modify_internal: "
				"entry failed schema check %s\n", 
				*text, 0, 0 );
#else
			Debug( LDAP_DEBUG_ANY,
				"entry failed schema check: %s\n",
				*text, 0, 0 );
#endif
		}

		/* if NOOP then silently revert to saved attrs */
		return rc;
	}

	/* update the indices of the modified attributes */
	if ( !op->o_noop ) {
		Modifications *m2;

		/* First look for any deletes that would nullify any adds
		 * in this request. I.e., deleting an entire attribute after
		 * assigning some values to it.
		 */
		for ( ml = modlist; ml != NULL; ml = ml->sml_next ) {
			if (bdb_index_is_indexed( op->o_bd, ml->sml_desc ))
				continue;
			switch ( ml->sml_op ) {
			case LDAP_MOD_DELETE:
				/* If just deleting specific values, ignore */
				if ( ml->sml_bvalues ) break;
			case LDAP_MOD_REPLACE:
				for ( m2 = modlist; m2 != ml; m2 = m2->sml_next ) {
					if ( m2->sml_desc == ml->sml_desc &&
						m2->sml_op != LDAP_MOD_DELETE )
						m2->sml_op |= NULLIFIED;
				}
				break;
			}
			ml->sml_op |= INDEXED;
		}
		/* Now index the modifications */
		for ( ml = modlist; ml != NULL; ml = ml->sml_next ) {
			if ( ! (ml->sml_op & INDEXED) ) continue;
			ml->sml_op ^= INDEXED;
			switch ( ml->sml_op ) {
			case LDAP_MOD_DELETE:
				if ( ml->sml_bvalues ) {
					ap = attr_find( e->e_attrs, ml->sml_desc );
					rc = bdb_index_values( op, tid, ml->sml_desc,
						ml->sml_nvalues ? ml->sml_nvalues : ml->sml_bvalues,
						ap ? ap->a_nvals : NULL,
						e->e_id, SLAP_INDEX_DELETE_OP );
					break;
				}
				/* FALLTHRU */
			case LDAP_MOD_REPLACE:
			/* A nullified replace still does its delete action */
			case LDAP_MOD_REPLACE | NULLIFIED:
				ap = attr_find( save_attrs, ml->sml_desc );
				if ( ap != NULL ) {
					rc = bdb_index_values( op, tid, ap->a_desc,
						ap->a_nvals, NULL,
						e->e_id, SLAP_INDEX_DELETE_OP );
				} else {
					rc = LDAP_SUCCESS;
				}
				if ( rc || ml->sml_op == LDAP_MOD_DELETE ||
					(ml->sml_op & NULLIFIED))
					break;
				/* FALLTHRU */
			case LDAP_MOD_ADD:
			case SLAP_MOD_SOFTADD:
				rc = bdb_index_values( op, tid, ml->sml_desc,
					ml->sml_nvalues ? ml->sml_nvalues : ml->sml_bvalues,
					NULL, e->e_id, SLAP_INDEX_ADD_OP );
				break;
			}
			ml->sml_op &= ~NULLIFIED;
			if ( rc != LDAP_SUCCESS ) {
				attrs_free( e->e_attrs );
				e->e_attrs = save_attrs;
#ifdef NEW_LOGGING
				LDAP_LOG ( OPERATION, ERR, 
					"bdb_modify_internal: attribute index update failure\n",
					0, 0, 0 );
#else
				Debug( LDAP_DEBUG_ANY,
				       "Attribute index update failure",
				       0, 0, 0 );
#endif
				/* reset our flags */
				for (; ml; ml=ml->sml_next ) {
					ml->sml_op &= ~(INDEXED | NULLIFIED);
				}
				break;
			}
		}
	}

	return rc;
}


int
bdb_modify( Operation *op, SlapReply *rs )
{
	struct bdb_info *bdb = (struct bdb_info *) op->o_bd->be_private;
	Entry		*e = NULL;
	EntryInfo	*ei = NULL;
	int		manageDSAit = get_manageDSAit( op );
	char textbuf[SLAP_TEXT_BUFLEN];
	size_t textlen = sizeof textbuf;
	DB_TXN	*ltid = NULL, *lt2;
	struct bdb_op_info opinfo;
	Entry		dummy;

	u_int32_t	locker = 0;
	DB_LOCK		lock;

	int		noop = 0;

	int		num_retries = 0;

#ifdef LDAP_SYNC
	Operation* ps_list;
	struct psid_entry *pm_list, *pm_prev;
	struct berval *max_committed_csn = NULL;
	EntryInfo       *suffix_ei = NULL;
	EntryInfo       *ctxcsn_ei = NULL;
	Entry           *ctxcsn_e = NULL;
	DB_LOCK         suffix_lock;
	DB_LOCK         ctxcsn_lock;
	struct berval ctxcsn_rdn = { 0, NULL };
	struct berval ctxcsn_ndn = { 0, NULL };
	int     rc, ret;
	int             ctxcsn_added = 0;
	ID              ctxcsn_id;
#endif

#ifdef NEW_LOGGING
	LDAP_LOG ( OPERATION, ENTRY, "bdb_modify: %s\n", op->o_req_dn.bv_val, 0, 0 );
#else
	Debug( LDAP_DEBUG_ARGS, "bdb_modify: %s\n", op->o_req_dn.bv_val, 0, 0 );
#endif

	if( 0 ) {
retry:	/* transaction retry */
		if( e != NULL ) {
			bdb_unlocked_cache_return_entry_w(&bdb->bi_cache, e);
			e = NULL;
		}
#ifdef NEW_LOGGING
		LDAP_LOG ( OPERATION, DETAIL1, "bdb_modify: retrying...\n", 0, 0, 0 );
#else
		Debug(LDAP_DEBUG_TRACE,
			"bdb_modify: retrying...\n", 0, 0, 0);
#endif

#ifdef LDAP_SYNC
		pm_list = LDAP_LIST_FIRST(&op->o_pm_list);
		while ( pm_list != NULL ) {
			LDAP_LIST_REMOVE ( pm_list, ps_link );
			pm_prev = pm_list;
			pm_list = LDAP_LIST_NEXT ( pm_list, ps_link );
			ch_free( pm_prev );
		}
#endif

		rs->sr_err = TXN_ABORT( ltid );
		ltid = NULL;
		op->o_private = NULL;
		op->o_do_not_cache = opinfo.boi_acl_cache;
		if( rs->sr_err != 0 ) {
			rs->sr_err = LDAP_OTHER;
			rs->sr_text = "internal error";
			goto return_results;
		}
		bdb_trans_backoff( ++num_retries );
		ldap_pvt_thread_yield();
	}

	/* begin transaction */
	rs->sr_err = TXN_BEGIN( bdb->bi_dbenv, NULL, &ltid, 
		bdb->bi_db_opflags );
	rs->sr_text = NULL;
	if( rs->sr_err != 0 ) {
#ifdef NEW_LOGGING
		LDAP_LOG ( OPERATION, DETAIL1, 
			"bdb_modify: txn_begin failed: %s (%d)\n", db_strerror(rs->sr_err), rs->sr_err, 0 );
#else
		Debug( LDAP_DEBUG_TRACE,
			"bdb_modify: txn_begin failed: %s (%d)\n",
			db_strerror(rs->sr_err), rs->sr_err, 0 );
#endif
		rs->sr_err = LDAP_OTHER;
		rs->sr_text = "internal error";
		goto return_results;
	}

	locker = TXN_ID ( ltid );

	opinfo.boi_bdb = op->o_bd;
	opinfo.boi_txn = ltid;
	opinfo.boi_locker = locker;
	opinfo.boi_err = 0;
	opinfo.boi_acl_cache = op->o_do_not_cache;
	op->o_private = &opinfo;

	/* get entry or ancestor */
	rs->sr_err = bdb_dn2entry( op, ltid, &op->o_req_ndn, &ei, 1,
		locker, &lock );

	if ( rs->sr_err != 0 ) {
#ifdef NEW_LOGGING
		LDAP_LOG ( OPERATION, DETAIL1, 
			"bdb_modify: dn2entry failed: (%d)\n", rs->sr_err, 0, 0 );
#else
		Debug( LDAP_DEBUG_TRACE,
			"bdb_modify: dn2entry failed (%d)\n",
			rs->sr_err, 0, 0 );
#endif
		switch( rs->sr_err ) {
		case DB_LOCK_DEADLOCK:
		case DB_LOCK_NOTGRANTED:
			goto retry;
		case DB_NOTFOUND:
			break;
		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;
		}
	}

	e = ei->bei_e;
	/* acquire and lock entry */
#ifdef LDAP_SYNCREPL /* FIXME: dn2entry() should return non-glue entry */
	if (( rs->sr_err == DB_NOTFOUND ) || ( !manageDSAit && e && is_entry_glue( e ))) {
#else
	if ( rs->sr_err == DB_NOTFOUND ) {
#endif
		if ( e != NULL ) {
			rs->sr_matched = ch_strdup( e->e_dn );
			rs->sr_ref = is_entry_referral( e )
				? get_entry_referrals( op, e )
				: NULL;
			bdb_unlocked_cache_return_entry_r (&bdb->bi_cache, e);
			e = NULL;

		} else {
#ifdef LDAP_SYNCREPL
			BerVarray deref = op->o_bd->syncinfo ?
							  op->o_bd->syncinfo->provideruri_bv : default_referral;
#else
			BerVarray deref = default_referral;
#endif
			rs->sr_ref = referral_rewrite( deref, NULL, &op->o_req_dn, LDAP_SCOPE_DEFAULT );
		}

		rs->sr_err = LDAP_REFERRAL;
		send_ldap_result( op, rs );

		ber_bvarray_free( rs->sr_ref );
		free( (char *)rs->sr_matched );
		rs->sr_ref = NULL;
		rs->sr_matched = NULL;

		goto done;
	}

	if ( !manageDSAit && is_entry_referral( e ) ) {
		/* entry is a referral, don't allow modify */
		rs->sr_ref = get_entry_referrals( op, e );

#ifdef NEW_LOGGING
		LDAP_LOG ( OPERATION, DETAIL1, "bdb_modify: entry is referral\n", 0, 0, 0 );
#else
		Debug( LDAP_DEBUG_TRACE,
			"bdb_modify: entry is referral\n",
			0, 0, 0 );
#endif

		rs->sr_err = LDAP_REFERRAL;
		rs->sr_matched = e->e_name.bv_val;
		send_ldap_result( op, rs );

		ber_bvarray_free( rs->sr_ref );
		rs->sr_ref = NULL;
		rs->sr_matched = NULL;
		goto done;
	}

	if ( get_assert( op ) &&
		( test_filter( op, e, get_assertion( op )) != LDAP_COMPARE_TRUE ))
	{
		rs->sr_err = LDAP_ASSERTION_FAILED;
		goto return_results;
	}

#ifdef LDAP_SYNC
	if ( rs->sr_err == LDAP_SUCCESS && !op->o_noop ) {
		LDAP_LIST_FOREACH ( ps_list, &bdb->bi_psearch_list, o_ps_link ) {
			bdb_psearch(op, rs, ps_list, e, LDAP_PSEARCH_BY_PREMODIFY );
		}
	}
#endif

	/* nested transaction */
	rs->sr_err = TXN_BEGIN( bdb->bi_dbenv, ltid, &lt2, 
		bdb->bi_db_opflags );
	rs->sr_text = NULL;
	if( rs->sr_err != 0 ) {
#ifdef NEW_LOGGING
		LDAP_LOG ( OPERATION, ERR, 
			"bdb_modify: txn_begin(2) failed: %s (%d)\n", db_strerror(rs->sr_err), rs->sr_err, 0 );
#else
		Debug( LDAP_DEBUG_TRACE,
			"bdb_modify: txn_begin(2) failed: %s (%d)\n",
			db_strerror(rs->sr_err), rs->sr_err, 0 );
#endif
		rs->sr_err = LDAP_OTHER;
		rs->sr_text = "internal error";
		goto return_results;
	}
	/* Modify the entry */
	dummy = *e;
	rs->sr_err = bdb_modify_internal( op, lt2, op->oq_modify.rs_modlist,
		&dummy, &rs->sr_text, textbuf, textlen );

	if( rs->sr_err != LDAP_SUCCESS ) {
#ifdef NEW_LOGGING
		LDAP_LOG ( OPERATION, ERR, 
			"bdb_modify: modify failed (%d)\n", rs->sr_err, 0, 0 );
#else
		Debug( LDAP_DEBUG_TRACE,
			"bdb_modify: modify failed (%d)\n",
			rs->sr_err, 0, 0 );
#endif
		if ( (rs->sr_err == LDAP_INSUFFICIENT_ACCESS) && opinfo.boi_err ) {
			rs->sr_err = opinfo.boi_err;
		}
		switch( rs->sr_err ) {
		case DB_LOCK_DEADLOCK:
		case DB_LOCK_NOTGRANTED:
			goto retry;
		}
		goto return_results;
	}

	/* change the entry itself */
	rs->sr_err = bdb_id2entry_update( op->o_bd, lt2, &dummy );
	if ( rs->sr_err != 0 ) {
#ifdef NEW_LOGGING
		LDAP_LOG ( OPERATION, ERR, 
			"bdb_modify: id2entry update failed (%d)\n", rs->sr_err, 0, 0 );
#else
		Debug( LDAP_DEBUG_TRACE,
			"bdb_modify: id2entry update failed (%d)\n",
			rs->sr_err, 0, 0 );
#endif
		switch( rs->sr_err ) {
		case DB_LOCK_DEADLOCK:
		case DB_LOCK_NOTGRANTED:
			goto retry;
		}
		rs->sr_text = "entry update failed";
		goto return_results;
	}
	if ( TXN_COMMIT( lt2, 0 ) != 0 ) {
		rs->sr_err = LDAP_OTHER;
		rs->sr_text = "txn_commit(2) failed";
		goto return_results;
	}

#ifdef LDAP_SYNC
	ber_str2bv( "cn=ldapsync", strlen("cn=ldapsync"), 0, &ctxcsn_rdn );
	build_new_dn( &ctxcsn_ndn, &op->o_bd->be_nsuffix[0], &ctxcsn_rdn );

	rc = bdb_dn2entry( op, ltid, &ctxcsn_ndn, &ctxcsn_ei,
							   0, locker, &ctxcsn_lock );

	if ( ctxcsn_ei ) {
		ctxcsn_e = ctxcsn_ei->bei_e;
		bdb_cache_entry_db_relock( bdb->bi_dbenv, locker, ctxcsn_ei, 1, 0, &ctxcsn_lock );
	}

	max_committed_csn = commit_csn( op );

	if ( max_committed_csn == NULL )
		goto txn_end;

	ctxcsn_added = 0;

	switch( rc ) {
	case 0:
		if ( !ctxcsn_e ) {
			rs->sr_err = LDAP_OTHER;
			rs->sr_text = "context csn not present";
			goto return_results;
		} else {
			attr_delete( &ctxcsn_e->e_attrs, slap_schema.si_ad_contextCSN );
			attr_merge_normalize_one( ctxcsn_e, slap_schema.si_ad_contextCSN,
							max_committed_csn, NULL );
			ret = bdb_id2entry_update( op->o_bd, ltid, ctxcsn_e );
			switch ( ret ) {
			case 0 :
				break;
			case DB_LOCK_DEADLOCK :
			case DB_LOCK_NOTGRANTED :
				goto rewind;
			default :
				rs->sr_err = ret;
				rs->sr_text = "context csn update failed";
				goto return_results;
			}
			ret = bdb_index_entry_add( op, ltid, ctxcsn_e );
			switch ( ret ) {
			case 0 :
				break;
			case DB_LOCK_DEADLOCK :
			case DB_LOCK_NOTGRANTED :
				goto rewind;
			default :
				rs->sr_err = LDAP_OTHER;
				rs->sr_text = "context csn indexing failed";
				goto return_results;
			}
		}
		break;
	case DB_NOTFOUND:
		if ( !be_issuffix( op->o_bd, &op->ora_e->e_nname ) ) {
			rc = bdb_dn2entry( op, ltid, &op->o_bd->be_nsuffix[0], &suffix_ei,
									0, locker, &suffix_lock );
		} else {
			suffix_ei = ei;
		}

		/* This serializes add. But this case is very rare : only once. */
		rs->sr_err = bdb_next_id( op->o_bd, NULL, &ctxcsn_id );
		if ( rs->sr_err != 0 ) {
#ifdef NEW_LOGGING
			LDAP_LOG ( OPERATION, ERR,
				"bdb_add: next_id failed (%d)\n", rs->sr_err, 0, 0 );
#else
			Debug( LDAP_DEBUG_TRACE,
				"bdb_add: next_id failed (%d)\n", rs->sr_err, 0, 0 );
#endif
			rs->sr_err = LDAP_OTHER;
			rs->sr_text = "internal error";
			goto return_results;
		}

		ctxcsn_e = create_context_csn_entry( op->o_bd, max_committed_csn );
		ctxcsn_e->e_id = ctxcsn_id;
		ctxcsn_added = 1;
		ret = bdb_dn2id_add( op, ltid, suffix_ei, ctxcsn_e );
		switch ( ret ) {
		case 0 :
			break;
		case DB_LOCK_DEADLOCK :
		case DB_LOCK_NOTGRANTED :
			goto rewind;
		case DB_KEYEXIST :
			rs->sr_err = LDAP_OTHER;
			rs->sr_text = "context csn exists before contex prefix does";
			goto return_results;
		default :
			rs->sr_err = LDAP_OTHER;
			rs->sr_text = "context csn store failed";
			goto return_results;
		}
		ret = bdb_id2entry_add( op->o_bd, ltid, ctxcsn_e );
		switch ( ret ) {
		case 0 :
			break;
		case DB_LOCK_DEADLOCK :
		case DB_LOCK_NOTGRANTED :
			goto rewind;
		default :
			rs->sr_err = LDAP_OTHER;
			rs->sr_text = "context csn store failed";
			goto return_results;
		}
		ret = bdb_index_entry_add( op, ltid, ctxcsn_e );
		switch ( ret ) {
		case 0 :
			break;
		case DB_LOCK_DEADLOCK :
		case DB_LOCK_NOTGRANTED :
			goto rewind;
		default :
			rs->sr_err = LDAP_OTHER;
			rs->sr_text = "context csn indexing failed";
			goto return_results;
		}
		break;
	case DB_LOCK_DEADLOCK:
	case DB_LOCK_NOTGRANTED:
		goto rewind;
	case LDAP_BUSY:
		rs->sr_err = rc;
		rs->sr_text = "ldap server busy";
		goto return_results;
	default:
		rs->sr_err = LDAP_OTHER;
		rs->sr_text = "internal error";
		goto return_results;
	}

	goto txn_end;

rewind :
	rewind_commit_csn( op );
	goto retry;

txn_end:
#endif

	if( op->o_noop ) {
		if ( ( rs->sr_err = TXN_ABORT( ltid ) ) != 0 ) {
			rs->sr_text = "txn_abort (no-op) failed";
		} else {
			noop = 1;
			rs->sr_err = LDAP_SUCCESS;
		}
	} else {
#ifdef LDAP_SYNC
		struct berval ctx_nrdn;
		EntryInfo *ctx_ei;
#endif
		bdb_cache_modify( e, dummy.e_attrs, bdb->bi_dbenv, locker, &lock );

#ifdef LDAP_SYNC
		if ( ctxcsn_added ) {
			ctx_nrdn.bv_val = "cn=ldapsync";
			ctx_nrdn.bv_len = strlen( ctx_nrdn.bv_val );
			bdb_cache_add( bdb, suffix_ei, ctxcsn_e, &ctx_nrdn, locker );
		}
#endif

		rs->sr_err = TXN_COMMIT( ltid, 0 );
	}
	ltid = NULL;
	op->o_private = NULL;


	if( rs->sr_err != 0 ) {
#ifdef NEW_LOGGING
		LDAP_LOG ( OPERATION, ERR, 
			"bdb_modify: txn_%s failed %s (%d)\n", 
			op->o_noop ? "abort (no_op)" : "commit", db_strerror(rs->sr_err), rs->sr_err );
#else
		Debug( LDAP_DEBUG_TRACE,
			"bdb_modify: txn_%s failed: %s (%d)\n",
			op->o_noop ? "abort (no-op)" : "commit",
			db_strerror(rs->sr_err), rs->sr_err );
#endif
		rs->sr_err = LDAP_OTHER;
		rs->sr_text = "commit failed";

	} else {
#ifdef NEW_LOGGING
		LDAP_LOG ( OPERATION, DETAIL1, 
			"bdb_modify: updated%s id=%08lx dn=\"%s\"\n", 
			op->o_noop ? " (no_op)" : "", e->e_id, e->e_dn );
#else
		Debug( LDAP_DEBUG_TRACE,
			"bdb_modify: updated%s id=%08lx dn=\"%s\"\n",
			op->o_noop ? " (no-op)" : "",
			e->e_id, e->e_dn );
#endif
		rs->sr_err = LDAP_SUCCESS;
		rs->sr_text = NULL;
	}

return_results:
	send_ldap_result( op, rs );

#ifdef LDAP_SYNC
	if ( rs->sr_err == LDAP_SUCCESS && !op->o_noop ) {
		/* Loop through in-scope entries for each psearch spec */
		LDAP_LIST_FOREACH ( ps_list, &bdb->bi_psearch_list, o_ps_link ) {
			bdb_psearch( op, rs, ps_list, e, LDAP_PSEARCH_BY_MODIFY );
		}
		pm_list = LDAP_LIST_FIRST(&op->o_pm_list);
		while ( pm_list != NULL ) {
			bdb_psearch(op, rs, pm_list->ps_op,
						e, LDAP_PSEARCH_BY_SCOPEOUT);
			LDAP_LIST_REMOVE ( pm_list, ps_link );
			pm_prev = pm_list;
			pm_list = LDAP_LIST_NEXT ( pm_list, ps_link );
			ch_free( pm_prev );
		}
	}
#endif

	if( rs->sr_err == LDAP_SUCCESS && bdb->bi_txn_cp ) {
		ldap_pvt_thread_yield();
		TXN_CHECKPOINT( bdb->bi_dbenv,
			bdb->bi_txn_cp_kbyte, bdb->bi_txn_cp_min, 0 );
	}

done:
	if( ltid != NULL ) {
#ifdef LDAP_SYNC
		pm_list = LDAP_LIST_FIRST(&op->o_pm_list);
		while ( pm_list != NULL ) {
			LDAP_LIST_REMOVE ( pm_list, ps_link );
			pm_prev = pm_list;
			pm_list = LDAP_LIST_NEXT ( pm_list, ps_link );
			ch_free( pm_prev );
		}
#endif
		TXN_ABORT( ltid );
		op->o_private = NULL;
	}

	if( e != NULL ) {
		bdb_unlocked_cache_return_entry_w (&bdb->bi_cache, e);
	}
	return ( ( rs->sr_err == LDAP_SUCCESS ) ? noop : rs->sr_err );
}