/* tools.c - tools for slap tools */
/* $OpenLDAP$ */
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
 *
 * Copyright 2011-2022 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>.
 */

#include "portable.h"

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

#define AVL_INTERNAL
#include "back-mdb.h"
#include "idl.h"

#ifdef MDB_TOOL_IDL_CACHING
static int mdb_tool_idl_flush( BackendDB *be, MDB_txn *txn );

#define	IDBLOCK	1024

typedef struct mdb_tool_idl_cache_entry {
	struct mdb_tool_idl_cache_entry *next;
	ID ids[IDBLOCK];
} mdb_tool_idl_cache_entry;

typedef struct mdb_tool_idl_cache {
	struct berval kstr;
	mdb_tool_idl_cache_entry *head, *tail;
	ID first, last;
	int count;
	short offset;
	short flags;
} mdb_tool_idl_cache;
#define WAS_FOUND	0x01
#define WAS_RANGE	0x02

#define MDB_TOOL_IDL_FLUSH(be, txn)	mdb_tool_idl_flush(be, txn)
#else
#define MDB_TOOL_IDL_FLUSH(be, txn)
#endif /* MDB_TOOL_IDL_CACHING */

MDB_txn *mdb_tool_txn = NULL;

static MDB_txn *txi = NULL;
static MDB_cursor *cursor = NULL, *idcursor = NULL;
static MDB_cursor *mcp = NULL, *mcd = NULL;
static MDB_val key, data;
static ID previd = NOID;

typedef struct dn_id {
	ID id;
	struct berval dn;
} dn_id;

#define	HOLE_SIZE	4096
static dn_id hbuf[HOLE_SIZE], *holes = hbuf;
static unsigned nhmax = HOLE_SIZE;
static unsigned nholes;

static struct berval	*tool_base;
static int		tool_scope;
static Filter		*tool_filter;
static Entry		*tool_next_entry;

static ID mdb_tool_ix_id;
static BackendDB *mdb_tool_ix_be;
static MDB_txn *mdb_tool_ix_txn;
static int mdb_tool_index_tcount, mdb_tool_threads;
static IndexRec *mdb_tool_index_rec;
static AttrIxInfo **mdb_tool_axinfo;
static struct mdb_info *mdb_tool_info;
static ldap_pvt_thread_mutex_t mdb_tool_index_mutex;
static ldap_pvt_thread_cond_t mdb_tool_index_cond_main;
static ldap_pvt_thread_cond_t mdb_tool_index_cond_work;
static void * mdb_tool_index_task( void *ctx, void *ptr );

static int	mdb_writes, mdb_writes_per_commit;

/* Number of ops per commit in Quick mode.
 * Batching speeds writes overall, but too large a
 * batch will fail with MDB_TXN_FULL.
 */
#ifndef MDB_WRITES_PER_COMMIT
#define MDB_WRITES_PER_COMMIT	500
#endif

static int
mdb_tool_entry_get_int( BackendDB *be, ID id, Entry **ep );

int mdb_tool_entry_open(
	BackendDB *be, int mode )
{
	/* In Quick mode, commit once per 500 entries */
	mdb_writes = 0;
	if ( slapMode & SLAP_TOOL_QUICK )
		mdb_writes_per_commit = MDB_WRITES_PER_COMMIT;
	else
		mdb_writes_per_commit = 1;

#ifdef MDB_TOOL_IDL_CACHING			/* threaded indexing has no performance advantage */
	/* Set up for threaded slapindex */
	if (( slapMode & (SLAP_TOOL_QUICK|SLAP_TOOL_READONLY)) == SLAP_TOOL_QUICK ) {
		if ( !mdb_tool_info ) {
			struct mdb_info *mdb = (struct mdb_info *) be->be_private;
			ldap_pvt_thread_mutex_init( &mdb_tool_index_mutex );
			ldap_pvt_thread_cond_init( &mdb_tool_index_cond_main );
			ldap_pvt_thread_cond_init( &mdb_tool_index_cond_work );
			if ( mdb->mi_nattrs ) {
				int i;
				mdb_tool_threads = slap_tool_thread_max - 1;
				if ( mdb_tool_threads > 1 ) {
					mdb_tool_index_rec = ch_calloc( mdb->mi_nattrs, sizeof( IndexRec ));
					mdb_tool_axinfo = ch_calloc( mdb_tool_threads, sizeof( AttrIxInfo* ) +
						sizeof( AttrIxInfo ));
					mdb_tool_axinfo[0] = (AttrIxInfo *)(mdb_tool_axinfo + mdb_tool_threads);
					for (i=1; i<mdb_tool_threads; i++)
						mdb_tool_axinfo[i] = mdb_tool_axinfo[i-1]+1;
					mdb_tool_index_tcount = mdb_tool_threads - 1;
					mdb_tool_ix_be = be;
					for (i=1; i<mdb_tool_threads; i++) {
						int *ptr = ch_malloc( sizeof( int ));
						*ptr = i;
						ldap_pvt_thread_pool_submit( &connection_pool,
							mdb_tool_index_task, ptr );
					}
					mdb_tool_info = mdb;
				}
			}
		}
	}
#endif

	return 0;
}

int mdb_tool_entry_close(
	BackendDB *be )
{
#ifdef MDB_TOOL_IDL_CACHING
	if ( mdb_tool_info ) {
		int i;
		slapd_shutdown = 1;
		ldap_pvt_thread_mutex_lock( &mdb_tool_index_mutex );

		/* There might still be some threads starting */
		while ( mdb_tool_index_tcount > 0 ) {
			ldap_pvt_thread_cond_wait( &mdb_tool_index_cond_main,
					&mdb_tool_index_mutex );
		}

		mdb_tool_index_tcount = mdb_tool_threads - 1;
		ldap_pvt_thread_cond_broadcast( &mdb_tool_index_cond_work );

		/* Make sure all threads are stopped */
		while ( mdb_tool_index_tcount > 0 ) {
			ldap_pvt_thread_cond_wait( &mdb_tool_index_cond_main,
				&mdb_tool_index_mutex );
		}
		ldap_pvt_thread_mutex_unlock( &mdb_tool_index_mutex );

		mdb_tool_info = NULL;
		slapd_shutdown = 0;
		ch_free( mdb_tool_index_rec );
		mdb_tool_index_tcount = mdb_tool_threads - 1;
		if (mdb_tool_txn)
			MDB_TOOL_IDL_FLUSH( be, mdb_tool_txn );
		for (i=0; i<mdb_tool_threads; i++) {
			mdb_tool_idl_cache *ic;
			mdb_tool_idl_cache_entry *ice;
			while ((ic = mdb_tool_axinfo[i]->ai_clist)) {
				mdb_tool_axinfo[i]->ai_clist = ic->head;
				free(ic);
			}
			while ((ice = mdb_tool_axinfo[i]->ai_flist)) {
				mdb_tool_axinfo[i]->ai_flist = ice->next;
				free(ice);
			}
		}
	}
#endif

	if( idcursor ) {
		mdb_cursor_close( idcursor );
		idcursor = NULL;
	}
	if( cursor ) {
		mdb_cursor_close( cursor );
		cursor = NULL;
	}
	{
		struct mdb_info *mdb = be->be_private;
		if ( mdb ) {
			int i;
			for (i=0; i<mdb->mi_nattrs; i++)
				mdb->mi_attrs[i]->ai_cursor = NULL;
		}
	}
	if( mdb_tool_txn ) {
		int rc;
		if (( rc = mdb_txn_commit( mdb_tool_txn ))) {
			Debug( LDAP_DEBUG_ANY,
				LDAP_XSTRING(mdb_tool_entry_close) ": database %s: "
				"txn_commit failed: %s (%d)\n",
				be->be_suffix[0].bv_val, mdb_strerror(rc), rc );
			return -1;
		}
		mdb_tool_txn = NULL;
	}
	if( txi ) {
		int rc;
		if (( rc = mdb_txn_commit( txi ))) {
			Debug( LDAP_DEBUG_ANY,
				LDAP_XSTRING(mdb_tool_entry_close) ": database %s: "
				"txn_commit failed: %s (%d)\n",
				be->be_suffix[0].bv_val, mdb_strerror(rc), rc );
			return -1;
		}
		txi = NULL;
	}

	if( nholes ) {
		unsigned i;
		fprintf( stderr, "Error, entries missing!\n");
		for (i=0; i<nholes; i++) {
			fprintf(stderr, "  entry %ld: %s\n",
				holes[i].id, holes[i].dn.bv_val);
		}
		nholes = 0;
		return -1;
	}

	return 0;
}

ID
mdb_tool_entry_first_x(
	BackendDB *be,
	struct berval *base,
	int scope,
	Filter *f )
{
	tool_base = base;
	tool_scope = scope;
	tool_filter = f;

	return mdb_tool_entry_next( be );
}

ID mdb_tool_entry_next(
	BackendDB *be )
{
	int rc;
	ID id;
	struct mdb_info *mdb;

	assert( be != NULL );
	assert( slapMode & SLAP_TOOL_MODE );

	mdb = (struct mdb_info *) be->be_private;
	assert( mdb != NULL );

	if ( !mdb_tool_txn ) {
		rc = mdb_txn_begin( mdb->mi_dbenv, NULL, MDB_RDONLY, &mdb_tool_txn );
		if ( rc )
			return NOID;
		rc = mdb_cursor_open( mdb_tool_txn, mdb->mi_id2entry, &cursor );
		if ( rc ) {
			mdb_txn_abort( mdb_tool_txn );
			return NOID;
		}
	}

next:;
	rc = mdb_cursor_get( cursor, &key, &data, MDB_NEXT );

	if( rc ) {
		return NOID;
	}

	previd = *(ID *)key.mv_data;
	id = previd;

	if ( !data.mv_size )
		goto next;

	if ( tool_filter || tool_base ) {
		static Operation op = {0};
		static Opheader ohdr = {0};

		op.o_hdr = &ohdr;
		op.o_bd = be;
		op.o_tmpmemctx = NULL;
		op.o_tmpmfuncs = &ch_mfuncs;

		if ( tool_next_entry ) {
			mdb_entry_release( &op, tool_next_entry, 0 );
			tool_next_entry = NULL;
		}

		rc = mdb_tool_entry_get_int( be, id, &tool_next_entry );
		if ( rc == LDAP_NO_SUCH_OBJECT ) {
			goto next;
		}

		assert( tool_next_entry != NULL );

		if ( tool_filter && test_filter( NULL, tool_next_entry, tool_filter ) != LDAP_COMPARE_TRUE )
		{
			mdb_entry_release( &op, tool_next_entry, 0 );
			tool_next_entry = NULL;
			goto next;
		}
	}

	return id;
}

ID mdb_tool_dn2id_get(
	Backend *be,
	struct berval *dn
)
{
	struct mdb_info *mdb;
	Operation op = {0};
	Opheader ohdr = {0};
	ID id;
	int rc;

	if ( BER_BVISEMPTY(dn) )
		return 0;

	mdb = (struct mdb_info *) be->be_private;

	if ( !mdb_tool_txn ) {
		rc = mdb_txn_begin( mdb->mi_dbenv, NULL, (slapMode & SLAP_TOOL_READONLY) != 0 ?
			MDB_RDONLY : 0, &mdb_tool_txn );
		if ( rc )
			return NOID;
	}

	op.o_hdr = &ohdr;
	op.o_bd = be;
	op.o_tmpmemctx = NULL;
	op.o_tmpmfuncs = &ch_mfuncs;

	rc = mdb_dn2id( &op, mdb_tool_txn, NULL, dn, &id, NULL, NULL, NULL );
	if ( rc == MDB_NOTFOUND )
		return NOID;

	return id;
}

static int
mdb_tool_entry_get_int( BackendDB *be, ID id, Entry **ep )
{
	Operation op = {0};
	Opheader ohdr = {0};

	Entry *e = NULL;
	struct berval dn = BER_BVNULL, ndn = BER_BVNULL;
	int rc;

	assert( be != NULL );
	assert( slapMode & SLAP_TOOL_MODE );

	if ( ( tool_filter || tool_base ) && id == previd && tool_next_entry != NULL ) {
		*ep = tool_next_entry;
		tool_next_entry = NULL;
		return LDAP_SUCCESS;
	}

	if ( id != previd ) {
		key.mv_size = sizeof(ID);
		key.mv_data = &id;
		rc = mdb_cursor_get( cursor, &key, &data, MDB_SET );
		if ( rc ) {
			rc = LDAP_OTHER;
			goto done;
		}
	}
	if ( !data.mv_size ) {
		rc = LDAP_NO_SUCH_OBJECT;
		goto done;
	}

	op.o_hdr = &ohdr;
	op.o_bd = be;
	op.o_tmpmemctx = NULL;
	op.o_tmpmfuncs = &ch_mfuncs;
	if ( slapMode & SLAP_TOOL_READONLY ) {
		rc = mdb_id2name( &op, mdb_tool_txn, &idcursor, id, &dn, &ndn );
		if ( rc  ) {
			rc = LDAP_OTHER;
			goto done;
		}
		if ( tool_base != NULL ) {
			if ( !dnIsSuffixScope( &ndn, tool_base, tool_scope ) ) {
				ch_free( dn.bv_val );
				ch_free( ndn.bv_val );
				rc = LDAP_NO_SUCH_OBJECT;
				goto done;
			}
		}
	}
	rc = mdb_entry_decode( &op, mdb_tool_txn, &data, id, &e );
	e->e_id = id;
	if ( !BER_BVISNULL( &dn )) {
		e->e_name = dn;
		e->e_nname = ndn;
	} else {
		e->e_name.bv_len = 0;
		e->e_name.bv_val = NULL;
		e->e_nname.bv_len = 0;
		e->e_nname.bv_val = NULL;
	}

done:
	if ( e != NULL ) {
		*ep = e;
	}

	return rc;
}

Entry*
mdb_tool_entry_get( BackendDB *be, ID id )
{
	Entry *e = NULL;
	int rc;

	if ( !mdb_tool_txn ) {
		struct mdb_info *mdb = (struct mdb_info *) be->be_private;
		rc = mdb_txn_begin( mdb->mi_dbenv, NULL,
			(slapMode & SLAP_TOOL_READONLY) ? MDB_RDONLY : 0, &mdb_tool_txn );
		if ( rc )
			return NULL;
	}
	if ( !cursor ) {
		struct mdb_info *mdb = (struct mdb_info *) be->be_private;
		rc = mdb_cursor_open( mdb_tool_txn, mdb->mi_id2entry, &cursor );
		if ( rc ) {
			mdb_txn_abort( mdb_tool_txn );
			mdb_tool_txn = NULL;
			return NULL;
		}
	}
	(void)mdb_tool_entry_get_int( be, id, &e );
	return e;
}

static int mdb_tool_next_id(
	Operation *op,
	MDB_txn *tid,
	Entry *e,
	struct berval *text,
	int hole )
{
	struct berval dn = e->e_name;
	struct berval ndn = e->e_nname;
	struct berval pdn, npdn, nmatched;
	ID id, pid = 0;
	int rc;

	if (ndn.bv_len == 0) {
		e->e_id = 0;
		return 0;
	}

	rc = mdb_dn2id( op, tid, mcp, &ndn, &id, NULL, NULL, &nmatched );
	if ( rc == MDB_NOTFOUND ) {
		if ( !be_issuffix( op->o_bd, &ndn ) ) {
			ID eid = e->e_id;
			dnParent( &ndn, &npdn );
			if ( nmatched.bv_len != npdn.bv_len ) {
				dnParent( &dn, &pdn );
				e->e_name = pdn;
				e->e_nname = npdn;
				rc = mdb_tool_next_id( op, tid, e, text, 1 );
				e->e_name = dn;
				e->e_nname = ndn;
				if ( rc ) {
					return rc;
				}
				/* If parent didn't exist, it was created just now
				 * and its ID is now in e->e_id. Make sure the current
				 * entry gets added under the new parent ID.
				 */
				if ( eid != e->e_id ) {
					pid = e->e_id;
				}
			} else {
				pid = id;
			}
		}
		rc = mdb_next_id( op->o_bd, idcursor, &e->e_id );
		if ( rc ) {
			snprintf( text->bv_val, text->bv_len,
				"next_id failed: %s (%d)",
				mdb_strerror(rc), rc );
		Debug( LDAP_DEBUG_ANY,
			"=> mdb_tool_next_id: %s\n", text->bv_val );
			return rc;
		}
		rc = mdb_dn2id_add( op, mcp, mcd, pid, 1, 1, e );
		if ( rc ) {
			snprintf( text->bv_val, text->bv_len,
				"dn2id_add failed: %s (%d)",
				mdb_strerror(rc), rc );
			Debug( LDAP_DEBUG_ANY,
				"=> mdb_tool_next_id: %s\n", text->bv_val );
		} else if ( hole ) {
			MDB_val key, data;
			if ( nholes == nhmax - 1 ) {
				if ( holes == hbuf ) {
					holes = ch_malloc( nhmax * sizeof(dn_id) * 2 );
					AC_MEMCPY( holes, hbuf, sizeof(hbuf) );
				} else {
					holes = ch_realloc( holes, nhmax * sizeof(dn_id) * 2 );
				}
				nhmax *= 2;
			}
			ber_dupbv( &holes[nholes].dn, &ndn );
			holes[nholes++].id = e->e_id;
			key.mv_size = sizeof(ID);
			key.mv_data = &e->e_id;
			data.mv_size = 0;
			data.mv_data = NULL;
			rc = mdb_cursor_put( idcursor, &key, &data, MDB_NOOVERWRITE );
			if ( rc == MDB_KEYEXIST )
				rc = 0;
			if ( rc ) {
				snprintf( text->bv_val, text->bv_len,
					"dummy id2entry add failed: %s (%d)",
					mdb_strerror(rc), rc );
				Debug( LDAP_DEBUG_ANY,
					"=> mdb_tool_next_id: %s\n", text->bv_val );
			}
		}
	} else if ( !hole ) {
		unsigned i, j;

		e->e_id = id;

		for ( i=0; i<nholes; i++) {
			if ( holes[i].id == e->e_id ) {
				free(holes[i].dn.bv_val);
				for (j=i;j<nholes;j++) holes[j] = holes[j+1];
				holes[j].id = 0;
				nholes--;
				break;
			} else if ( holes[i].id > e->e_id ) {
				break;
			}
		}
	}
	return rc;
}

static int
mdb_tool_index_add(
	Operation *op,
	MDB_txn *txn,
	Entry *e )
{
	struct mdb_info *mdb = (struct mdb_info *) op->o_bd->be_private;

	if ( !mdb->mi_nattrs )
		return 0;

	if ( mdb_tool_threads > 1 ) {
		IndexRec *ir;
		int i, rc;
		Attribute *a;

		ir = mdb_tool_index_rec;
		for (i=0; i<mdb->mi_nattrs; i++)
			ir[i].ir_attrs = NULL;

		for ( a = e->e_attrs; a != NULL; a = a->a_next ) {
			rc = mdb_index_recset( mdb, a, a->a_desc->ad_type,
				&a->a_desc->ad_tags, ir );
			if ( rc )
				return rc;
		}
		for (i=0; i<mdb->mi_nattrs; i++) {
			if ( !ir[i].ir_ai )
				break;
			rc = mdb_cursor_open( txn, ir[i].ir_ai->ai_dbi,
				 &ir[i].ir_ai->ai_cursor );
			if ( rc )
				return rc;
		}
		mdb_tool_ix_id = e->e_id;
		mdb_tool_ix_txn = txn;
		ldap_pvt_thread_mutex_lock( &mdb_tool_index_mutex );
		/* Wait for all threads to be ready */
		while ( mdb_tool_index_tcount ) {
			ldap_pvt_thread_cond_wait( &mdb_tool_index_cond_main,
				&mdb_tool_index_mutex );
		}

		for ( i=1; i<mdb_tool_threads; i++ )
			mdb_tool_index_rec[i].ir_i = LDAP_BUSY;
		mdb_tool_index_tcount = mdb_tool_threads - 1;
		ldap_pvt_thread_cond_broadcast( &mdb_tool_index_cond_work );
		ldap_pvt_thread_mutex_unlock( &mdb_tool_index_mutex );

		return mdb_index_recrun( op, txn, mdb, ir, e->e_id, 0 );
	} else
	{
		return mdb_index_entry_add( op, txn, e );
	}
}

static int
mdb_tool_index_finish()
{
	int i, rc = 0;
	ldap_pvt_thread_mutex_lock( &mdb_tool_index_mutex );
	for ( i=1; i<mdb_tool_threads; i++ ) {
		if ( mdb_tool_index_rec[i].ir_i == LDAP_BUSY ) {
			ldap_pvt_thread_cond_wait( &mdb_tool_index_cond_main,
				&mdb_tool_index_mutex );
			i--;
			continue;
		}
		if ( mdb_tool_index_rec[i].ir_i ) {
			rc = mdb_tool_index_rec[i].ir_i;
			break;
		}
	}
	ldap_pvt_thread_mutex_unlock( &mdb_tool_index_mutex );
	return rc;
}

ID mdb_tool_entry_put(
	BackendDB *be,
	Entry *e,
	struct berval *text )
{
	int rc;
	struct mdb_info *mdb;
	Operation op = {0};
	Opheader ohdr = {0};

	assert( be != NULL );
	assert( slapMode & SLAP_TOOL_MODE );

	assert( text != NULL );
	assert( text->bv_val != NULL );
	assert( text->bv_val[0] == '\0' );	/* overconservative? */

	Debug( LDAP_DEBUG_TRACE, "=> " LDAP_XSTRING(mdb_tool_entry_put)
		"( %ld, \"%s\" )\n", (long) e->e_id, e->e_dn );

	mdb = (struct mdb_info *) be->be_private;

	if ( !mdb_tool_txn ) {
		rc = mdb_txn_begin( mdb->mi_dbenv, NULL, 0, &mdb_tool_txn );
		if( rc != 0 ) {
			snprintf( text->bv_val, text->bv_len,
				"txn_begin failed: %s (%d)",
				mdb_strerror(rc), rc );
			Debug( LDAP_DEBUG_ANY,
				"=> " LDAP_XSTRING(mdb_tool_entry_put) ": %s\n",
				 text->bv_val );
			return NOID;
		}
	}
	if ( !idcursor ) {
		rc = mdb_cursor_open( mdb_tool_txn, mdb->mi_id2entry, &idcursor );
		if( rc != 0 ) {
			snprintf( text->bv_val, text->bv_len,
				"cursor_open failed: %s (%d)",
				mdb_strerror(rc), rc );
			Debug( LDAP_DEBUG_ANY,
				"=> " LDAP_XSTRING(mdb_tool_entry_put) ": %s\n",
				 text->bv_val );
			return NOID;
		}
		if ( !mdb->mi_nextid ) {
			ID dummy;
			mdb_next_id( be, idcursor, &dummy );
		}
		rc = mdb_cursor_open( mdb_tool_txn, mdb->mi_dn2id, &mcp );
		if( rc != 0 ) {
			snprintf( text->bv_val, text->bv_len,
				"cursor_open failed: %s (%d)",
				mdb_strerror(rc), rc );
			Debug( LDAP_DEBUG_ANY,
				"=> " LDAP_XSTRING(mdb_tool_entry_put) ": %s\n",
				 text->bv_val );
			return NOID;
		}
		rc = mdb_cursor_open( mdb_tool_txn, mdb->mi_dn2id, &mcd );
		if( rc != 0 ) {
			snprintf( text->bv_val, text->bv_len,
				"cursor_open failed: %s (%d)",
				mdb_strerror(rc), rc );
			Debug( LDAP_DEBUG_ANY,
				"=> " LDAP_XSTRING(mdb_tool_entry_put) ": %s\n",
				 text->bv_val );
			return NOID;
		}
	}

	op.o_hdr = &ohdr;
	op.o_bd = be;
	op.o_tmpmemctx = NULL;
	op.o_tmpmfuncs = &ch_mfuncs;

	/* add dn2id indices */
	rc = mdb_tool_next_id( &op, mdb_tool_txn, e, text, 0 );
	if( rc != 0 ) {
		goto done;
	}

	if ( mdb_tool_threads > 1 ) {
		LDAP_SLIST_INSERT_HEAD( &op.o_extra, &mdb_tool_axinfo[0]->ai_oe, oe_next );
	}
	rc = mdb_tool_index_add( &op, mdb_tool_txn, e );
	if( rc != 0 ) {
		snprintf( text->bv_val, text->bv_len,
				"index_entry_add failed: err=%d", rc );
		Debug( LDAP_DEBUG_ANY,
			"=> " LDAP_XSTRING(mdb_tool_entry_put) ": %s\n",
			text->bv_val );
		goto done;
	}


	/* id2entry index */
	rc = mdb_id2entry_add( &op, mdb_tool_txn, idcursor, e );
	if( rc != 0 ) {
		snprintf( text->bv_val, text->bv_len,
				"id2entry_add failed: err=%d", rc );
		Debug( LDAP_DEBUG_ANY,
			"=> " LDAP_XSTRING(mdb_tool_entry_put) ": %s\n",
			text->bv_val );
		goto done;
	}

	if( mdb->mi_nattrs && mdb_tool_threads > 1 )
		rc = mdb_tool_index_finish();

done:
	if( rc == 0 ) {
		mdb_writes++;
		if ( mdb_writes >= mdb_writes_per_commit ) {
			unsigned i;
			MDB_TOOL_IDL_FLUSH( be, mdb_tool_txn );
			rc = mdb_txn_commit( mdb_tool_txn );
			for ( i=0; i<mdb->mi_nattrs; i++ )
				mdb->mi_attrs[i]->ai_cursor = NULL;
			mdb_writes = 0;
			mdb_tool_txn = NULL;
			idcursor = NULL;
			if( rc != 0 ) {
				mdb->mi_numads = 0;
				snprintf( text->bv_val, text->bv_len,
						"txn_commit failed: %s (%d)",
						mdb_strerror(rc), rc );
				Debug( LDAP_DEBUG_ANY,
					"=> " LDAP_XSTRING(mdb_tool_entry_put) ": %s\n",
					text->bv_val );
				e->e_id = NOID;
			}
		}

	} else {
		unsigned i;
		mdb_txn_abort( mdb_tool_txn );
		mdb_tool_txn = NULL;
		idcursor = NULL;
		for ( i=0; i<mdb->mi_nattrs; i++ )
			mdb->mi_attrs[i]->ai_cursor = NULL;
		mdb_writes = 0;
		snprintf( text->bv_val, text->bv_len,
			"txn_aborted! %s (%d)",
			rc == LDAP_OTHER ? "Internal error" :
			mdb_strerror(rc), rc );
		Debug( LDAP_DEBUG_ANY,
			"=> " LDAP_XSTRING(mdb_tool_entry_put) ": %s\n",
			text->bv_val );
		e->e_id = NOID;
	}

	return e->e_id;
}

static int mdb_dn2id_upgrade( BackendDB *be );

int mdb_tool_entry_reindex(
	BackendDB *be,
	ID id,
	AttributeDescription **adv )
{
	struct mdb_info *mi = (struct mdb_info *) be->be_private;
	int rc;
	Entry *e;
	Operation op = {0};
	Opheader ohdr = {0};

	Debug( LDAP_DEBUG_ARGS,
		"=> " LDAP_XSTRING(mdb_tool_entry_reindex) "( %ld )\n",
		(long) id );
	assert( tool_base == NULL );
	assert( tool_filter == NULL );

	/* Special: do a dn2id upgrade */
	if ( adv && adv[0] == slap_schema.si_ad_entryDN ) {
		/* short-circuit tool_entry_next() */
		mdb_cursor_get( cursor, &key, &data, MDB_LAST );
		return mdb_dn2id_upgrade( be );
	}

	/* No indexes configured, nothing to do. Could return an
	 * error here to shortcut things.
	 */
	if (!mi->mi_attrs) {
		return 0;
	}

	/* Check for explicit list of attrs to index */
	if ( adv ) {
		int i, j, n;

		if ( mi->mi_attrs[0]->ai_desc != adv[0] ) {
			/* count */
			for ( n = 0; adv[n]; n++ ) ;

			/* insertion sort */
			for ( i = 0; i < n; i++ ) {
				AttributeDescription *ad = adv[i];
				for ( j = i-1; j>=0; j--) {
					if ( SLAP_PTRCMP( adv[j], ad ) <= 0 ) break;
					adv[j+1] = adv[j];
				}
				adv[j+1] = ad;
			}
		}

		for ( i = 0; adv[i]; i++ ) {
			if ( mi->mi_attrs[i]->ai_desc != adv[i] ) {
				for ( j = i+1; j < mi->mi_nattrs; j++ ) {
					if ( mi->mi_attrs[j]->ai_desc == adv[i] ) {
						AttrInfo *ai = mi->mi_attrs[i];
						mi->mi_attrs[i] = mi->mi_attrs[j];
						mi->mi_attrs[j] = ai;
						break;
					}
				}
				if ( j == mi->mi_nattrs ) {
					Debug( LDAP_DEBUG_ANY,
						LDAP_XSTRING(mdb_tool_entry_reindex)
						": no index configured for %s\n",
						adv[i]->ad_cname.bv_val );
					return -1;
				}
			}
		}
		mi->mi_nattrs = i;
	}

	e = mdb_tool_entry_get( be, id );

	if( e == NULL ) {
		Debug( LDAP_DEBUG_ANY,
			LDAP_XSTRING(mdb_tool_entry_reindex)
			": could not locate id=%ld\n",
			(long) id );
		return -1;
	}

	if ( !txi ) {
		rc = mdb_txn_begin( mi->mi_dbenv, NULL, 0, &txi );
		if( rc != 0 ) {
			Debug( LDAP_DEBUG_ANY,
				"=> " LDAP_XSTRING(mdb_tool_entry_reindex) ": "
				"txn_begin failed: %s (%d)\n",
				mdb_strerror(rc), rc );
			goto done;
		}
	}

	if ( slapMode & SLAP_TRUNCATE_MODE ) {
		int i;
		for ( i=0; i < mi->mi_nattrs; i++ ) {
			rc = mdb_drop( txi, mi->mi_attrs[i]->ai_dbi, 0 );
			if ( rc ) {
				Debug( LDAP_DEBUG_ANY,
					LDAP_XSTRING(mdb_tool_entry_reindex)
					": (Truncate) mdb_drop(%s) failed: %s (%d)\n",
					mi->mi_attrs[i]->ai_desc->ad_type->sat_cname.bv_val,
					mdb_strerror(rc), rc );
				return -1;
			}
		}
		slapMode ^= SLAP_TRUNCATE_MODE;
	}

	/*
	 * just (re)add them for now
	 * Use truncate mode to empty/reset index databases
	 */

	Debug( LDAP_DEBUG_TRACE,
		"=> " LDAP_XSTRING(mdb_tool_entry_reindex) "( %ld )\n",
		(long) id );

	op.o_hdr = &ohdr;
	op.o_bd = be;
	op.o_tmpmemctx = NULL;
	op.o_tmpmfuncs = &ch_mfuncs;

	rc = mdb_tool_index_add( &op, txi, e );

done:
	if( rc == 0 ) {
		mdb_writes++;
		if ( mdb_writes >= mdb_writes_per_commit ) {
			MDB_val key;
			unsigned i;
			MDB_TOOL_IDL_FLUSH( be, txi );
			rc = mdb_txn_commit( txi );
			mdb_writes = 0;
			for ( i=0; i<mi->mi_nattrs; i++ )
				mi->mi_attrs[i]->ai_cursor = NULL;
			if( rc != 0 ) {
				Debug( LDAP_DEBUG_ANY,
					"=> " LDAP_XSTRING(mdb_tool_entry_reindex)
					": txn_commit failed: %s (%d)\n",
					mdb_strerror(rc), rc );
				e->e_id = NOID;
			}
			mdb_cursor_close( cursor );
			txi = NULL;
			/* Must close the read txn to allow old pages to be reclaimed. */
			mdb_txn_abort( mdb_tool_txn );
			/* and then reopen it so that tool_entry_next still works. */
			mdb_txn_begin( mi->mi_dbenv, NULL, MDB_RDONLY, &mdb_tool_txn );
			mdb_cursor_open( mdb_tool_txn, mi->mi_id2entry, &cursor );
			key.mv_data = &id;
			key.mv_size = sizeof(ID);
			mdb_cursor_get( cursor, &key, NULL, MDB_SET );
		}

	} else {
		unsigned i;
		mdb_writes = 0;
		mdb_cursor_close( cursor );
		cursor = NULL;
		mdb_txn_abort( txi );
		for ( i=0; i<mi->mi_nattrs; i++ )
			mi->mi_attrs[i]->ai_cursor = NULL;
		Debug( LDAP_DEBUG_ANY,
			"=> " LDAP_XSTRING(mdb_tool_entry_reindex)
			": txn_aborted! err=%d\n",
			rc );
		e->e_id = NOID;
		txi = NULL;
	}
	mdb_entry_release( &op, e, 0 );

	return rc;
}

ID mdb_tool_entry_modify(
	BackendDB *be,
	Entry *e,
	struct berval *text )
{
	int rc;
	struct mdb_info *mdb;
	Operation op = {0};
	Opheader ohdr = {0};

	assert( be != NULL );
	assert( slapMode & SLAP_TOOL_MODE );

	assert( text != NULL );
	assert( text->bv_val != NULL );
	assert( text->bv_val[0] == '\0' );	/* overconservative? */

	assert ( e->e_id != NOID );

	Debug( LDAP_DEBUG_TRACE,
		"=> " LDAP_XSTRING(mdb_tool_entry_modify) "( %ld, \"%s\" )\n",
		(long) e->e_id, e->e_dn );

	mdb = (struct mdb_info *) be->be_private;

	if( cursor ) {
		mdb_cursor_close( cursor );
		cursor = NULL;
	}
	if ( !mdb_tool_txn ) {
		rc = mdb_txn_begin( mdb->mi_dbenv, NULL, 0, &mdb_tool_txn );
		if( rc != 0 ) {
			snprintf( text->bv_val, text->bv_len,
				"txn_begin failed: %s (%d)",
				mdb_strerror(rc), rc );
			Debug( LDAP_DEBUG_ANY,
				"=> " LDAP_XSTRING(mdb_tool_entry_modify) ": %s\n",
				 text->bv_val );
			return NOID;
		}
	}

	op.o_hdr = &ohdr;
	op.o_bd = be;
	op.o_tmpmemctx = NULL;
	op.o_tmpmfuncs = &ch_mfuncs;

	/* id2entry index */
	rc = mdb_id2entry_update( &op, mdb_tool_txn, NULL, e );
	if( rc != 0 ) {
		snprintf( text->bv_val, text->bv_len,
				"id2entry_update failed: err=%d", rc );
		Debug( LDAP_DEBUG_ANY,
			"=> " LDAP_XSTRING(mdb_tool_entry_modify) ": %s\n",
			text->bv_val );
		goto done;
	}

done:
	if( rc == 0 ) {
		rc = mdb_txn_commit( mdb_tool_txn );
		if( rc != 0 ) {
			mdb->mi_numads = 0;
			snprintf( text->bv_val, text->bv_len,
					"txn_commit failed: %s (%d)",
					mdb_strerror(rc), rc );
			Debug( LDAP_DEBUG_ANY,
				"=> " LDAP_XSTRING(mdb_tool_entry_modify) ": "
				"%s\n", text->bv_val );
			e->e_id = NOID;
		}

	} else {
		mdb_txn_abort( mdb_tool_txn );
		snprintf( text->bv_val, text->bv_len,
			"txn_aborted! %s (%d)",
			mdb_strerror(rc), rc );
		Debug( LDAP_DEBUG_ANY,
			"=> " LDAP_XSTRING(mdb_tool_entry_modify) ": %s\n",
			text->bv_val );
		e->e_id = NOID;
	}
	mdb_tool_txn = NULL;

	return e->e_id;
}

int mdb_tool_entry_delete(
	BackendDB *be,
	struct berval *ndn,
	struct berval *text )
{
	int rc;
	struct mdb_info *mdb;
	Operation op = {0};
	Opheader ohdr = {0};
	Entry *e;

	assert( be != NULL );
	assert( slapMode & SLAP_TOOL_MODE );

	assert( text != NULL );
	assert( text->bv_val != NULL );
	assert( text->bv_val[0] == '\0' );	/* overconservative? */

	assert ( ndn != NULL );
	assert ( ndn->bv_val != NULL );

	Debug( LDAP_DEBUG_TRACE,
		"=> " LDAP_XSTRING(mdb_tool_entry_delete) "( %s )\n",
		ndn->bv_val );

	mdb = (struct mdb_info *) be->be_private;

	assert( cursor == NULL );
	if( cursor ) {
		mdb_cursor_close( cursor );
		cursor = NULL;
	}
	if( !mdb_tool_txn ) {
		rc = mdb_txn_begin( mdb->mi_dbenv, NULL, 0, &mdb_tool_txn );
		if( rc != 0 ) {
			snprintf( text->bv_val, text->bv_len,
				"txn_begin failed: %s (%d)",
				mdb_strerror(rc), rc );
			Debug( LDAP_DEBUG_ANY,
				"=> " LDAP_XSTRING(mdb_tool_entry_delete) ": %s\n",
				 text->bv_val );
			return LDAP_OTHER;
		}
	}

	rc = mdb_cursor_open( mdb_tool_txn, mdb->mi_dn2id, &cursor );
	if( rc != 0 ) {
		snprintf( text->bv_val, text->bv_len,
			"cursor_open failed: %s (%d)",
			mdb_strerror(rc), rc );
		Debug( LDAP_DEBUG_ANY,
			"=> " LDAP_XSTRING(mdb_tool_entry_delete) ": %s\n",
			 text->bv_val );
		return LDAP_OTHER;
	}

	op.o_hdr = &ohdr;
	op.o_bd = be;
	op.o_tmpmemctx = NULL;
	op.o_tmpmfuncs = &ch_mfuncs;

	rc = mdb_dn2entry( &op, mdb_tool_txn, cursor, ndn, &e, NULL, 0 );
	if( rc != 0 ) {
		snprintf( text->bv_val, text->bv_len,
			"dn2entry failed: %s (%d)",
			mdb_strerror(rc), rc );
		Debug( LDAP_DEBUG_ANY,
			"=> " LDAP_XSTRING(mdb_tool_entry_delete) ": %s\n",
			 text->bv_val );
		goto done;
	}

	/* check that we wouldn't orphan any children */
	rc = mdb_dn2id_children( &op, mdb_tool_txn, e );
	if( rc != MDB_NOTFOUND ) {
		switch( rc ) {
		case 0:
			snprintf( text->bv_val, text->bv_len,
				"delete failed:"
				" subordinate objects must be deleted first");
			break;
		default:
			snprintf( text->bv_val, text->bv_len,
				"has_children failed: %s (%d)",
				mdb_strerror(rc), rc );
			break;
		}
		rc = -1;
		Debug( LDAP_DEBUG_ANY,
			"=> " LDAP_XSTRING(mdb_tool_entry_delete) ": %s\n",
			 text->bv_val );
		goto done;
	}

	/* delete from dn2id */
	rc = mdb_dn2id_delete( &op, cursor, e->e_id, 1 );
	if( rc != 0 ) {
		snprintf( text->bv_val, text->bv_len,
				"dn2id_delete failed: err=%d", rc );
		Debug( LDAP_DEBUG_ANY,
			"=> " LDAP_XSTRING(mdb_tool_entry_delete) ": %s\n",
			text->bv_val );
		goto done;
	}

	/* deindex values */
	rc = mdb_index_entry_del( &op, mdb_tool_txn, e );
	if( rc != 0 ) {
		snprintf( text->bv_val, text->bv_len,
				"entry_delete failed: err=%d", rc );
		Debug( LDAP_DEBUG_ANY,
			"=> " LDAP_XSTRING(mdb_tool_entry_delete) ": %s\n",
			text->bv_val );
		goto done;
	}

	/* do the deletion */
	rc = mdb_id2entry_delete( be, mdb_tool_txn, e );
	if( rc != 0 ) {
		snprintf( text->bv_val, text->bv_len,
				"id2entry_update failed: err=%d", rc );
		Debug( LDAP_DEBUG_ANY,
			"=> " LDAP_XSTRING(mdb_tool_entry_delete) ": %s\n",
			text->bv_val );
		goto done;
	}

done:
	/* free entry */
	if( e != NULL ) {
		mdb_entry_return( &op, e );
	}

	if( rc == 0 ) {
		rc = mdb_txn_commit( mdb_tool_txn );
		if( rc != 0 ) {
			snprintf( text->bv_val, text->bv_len,
					"txn_commit failed: %s (%d)",
					mdb_strerror(rc), rc );
			Debug( LDAP_DEBUG_ANY,
				"=> " LDAP_XSTRING(mdb_tool_entry_delete) ": "
				"%s\n", text->bv_val );
		}

	} else {
		mdb_txn_abort( mdb_tool_txn );
		snprintf( text->bv_val, text->bv_len,
			"txn_aborted! %s (%d)",
			mdb_strerror(rc), rc );
		Debug( LDAP_DEBUG_ANY,
			"=> " LDAP_XSTRING(mdb_tool_entry_delete) ": %s\n",
			text->bv_val );
	}
	mdb_tool_txn = NULL;
	cursor = NULL;

	return rc;
}

static void *
mdb_tool_index_task( void *ctx, void *ptr )
{
	int base = *(int *)ptr;
	Operation op = {0};
	Opheader ohdr = {0};
	AttrIxInfo ai = {0}, *aio;

	free( ptr );
	op.o_hdr = &ohdr;
	op.o_bd = mdb_tool_ix_be;
	op.o_tmpmemctx = NULL;
	op.o_tmpmfuncs = &ch_mfuncs;
	aio = mdb_tool_axinfo[base];
	mdb_tool_axinfo[base] = &ai;
	LDAP_SLIST_INSERT_HEAD( &op.o_extra, &ai.ai_oe, oe_next );
	while ( 1 ) {
		ldap_pvt_thread_mutex_lock( &mdb_tool_index_mutex );
		mdb_tool_index_tcount--;
		if ( !mdb_tool_index_tcount )
			ldap_pvt_thread_cond_signal( &mdb_tool_index_cond_main );
		ldap_pvt_thread_cond_wait( &mdb_tool_index_cond_work,
			&mdb_tool_index_mutex );
		if ( slapd_shutdown ) {
			mdb_tool_index_tcount--;
			if ( !mdb_tool_index_tcount )
				ldap_pvt_thread_cond_signal( &mdb_tool_index_cond_main );
			*aio = ai;
			mdb_tool_axinfo[base] = aio;
			ldap_pvt_thread_mutex_unlock( &mdb_tool_index_mutex );
			break;
		}
		ldap_pvt_thread_mutex_unlock( &mdb_tool_index_mutex );
		mdb_tool_index_rec[base].ir_i = mdb_index_recrun( &op,
			mdb_tool_ix_txn,
			mdb_tool_info, mdb_tool_index_rec, mdb_tool_ix_id, base );
	}

	return NULL;
}

#ifdef MDB_TOOL_IDL_CACHING
static int
mdb_tool_idl_cmp( const void *v1, const void *v2 )
{
	const mdb_tool_idl_cache *c1 = v1, *c2 = v2;
	int rc;

	if (( rc = c1->kstr.bv_len - c2->kstr.bv_len )) return rc;
	return memcmp( c1->kstr.bv_val, c2->kstr.bv_val, c1->kstr.bv_len );
}

static int
mdb_tool_idl_flush_one( MDB_cursor *mc, AttrIxInfo *ai, mdb_tool_idl_cache *ic )
{
	mdb_tool_idl_cache_entry *ice;
	MDB_val key, data[2];
	int i, rc;
	ID id, nid;

	/* Freshly allocated, ignore it */
	if ( !ic->head && ic->count <= MDB_idl_db_size ) {
		return 0;
	}

	key.mv_data = ic->kstr.bv_val;
	key.mv_size = ic->kstr.bv_len;

	if ( ic->count > MDB_idl_db_size ) {
		while ( ic->flags & WAS_FOUND ) {
			rc = mdb_cursor_get( mc, &key, data, MDB_SET );
			if ( rc ) {
				/* FIXME: find out why this happens */
				ic->flags = 0;
				break;
			}
			if ( ic->flags & WAS_RANGE ) {
				/* Skip lo */
				rc = mdb_cursor_get( mc, &key, data, MDB_NEXT_DUP );

				/* Get hi */
				rc = mdb_cursor_get( mc, &key, data, MDB_NEXT_DUP );

				/* Store range hi */
				data[0].mv_data = &ic->last;
				rc = mdb_cursor_put( mc, &key, data, MDB_CURRENT );
			} else {
				/* Delete old data, replace with range */
				ic->first = *(ID *)data[0].mv_data;
				mdb_cursor_del( mc, MDB_NODUPDATA );
			}
			break;
		}
		if ( !(ic->flags & WAS_RANGE)) {
			/* range, didn't exist before */
			nid = 0;
			data[0].mv_size = sizeof(ID);
			data[0].mv_data = &nid;
			rc = mdb_cursor_put( mc, &key, data, 0 );
			if ( rc == 0 ) {
				data[0].mv_data = &ic->first;
				rc = mdb_cursor_put( mc, &key, data, 0 );
				if ( rc == 0 ) {
					data[0].mv_data = &ic->last;
					rc = mdb_cursor_put( mc, &key, data, 0 );
				}
			}
			if ( rc ) {
				rc = -1;
			}
		}
	} else {
		/* Normal write */
		int n;

		data[0].mv_size = sizeof(ID);
		rc = 0;
		for ( ice = ic->head, n=0; ice; ice = ice->next, n++ ) {
			int end;
			if ( ice->next ) {
				end = IDBLOCK;
			} else {
				end = (ic->count-ic->offset) & (IDBLOCK-1);
				if ( !end )
					end = IDBLOCK;
			}
			data[1].mv_size = end;
			data[0].mv_data = ice->ids;
			rc = mdb_cursor_put( mc, &key, data, MDB_APPENDDUP|MDB_MULTIPLE );
			if ( rc ) {
				rc = -1;
				break;
			}
		}
		if ( ic->head ) {
			ic->tail->next = ai->ai_flist;
			ai->ai_flist = ic->head;
		}
	}
	ic->head = ai->ai_clist;
	ai->ai_clist = ic;
	return rc;
}

static int
mdb_tool_idl_flush_db( MDB_txn *txn, AttrInfo *ai, AttrIxInfo *ax )
{
	MDB_cursor *mc;
	Avlnode *root;
	int rc;

	mdb_cursor_open( txn, ai->ai_dbi, &mc );
	root = ldap_tavl_end( ai->ai_root, TAVL_DIR_LEFT );
	do {
		rc = mdb_tool_idl_flush_one( mc, ax, root->avl_data );
		if ( rc != -1 )
			rc = 0;
	} while ((root = ldap_tavl_next(root, TAVL_DIR_RIGHT)));
	mdb_cursor_close( mc );

	return rc;
}

static int
mdb_tool_idl_flush( BackendDB *be, MDB_txn *txn )
{
	struct mdb_info *mdb = (struct mdb_info *) be->be_private;
	int rc = 0;
	unsigned int i, dbi;

	for ( i=0; i < mdb->mi_nattrs; i++ ) {
		if ( !mdb->mi_attrs[i]->ai_root ) continue;
		rc = mdb_tool_idl_flush_db( txn, mdb->mi_attrs[i], mdb_tool_axinfo[i % mdb_tool_threads] );
		ldap_tavl_free(mdb->mi_attrs[i]->ai_root, NULL);
		mdb->mi_attrs[i]->ai_root = NULL;
		if ( rc )
			break;
	}
	return rc;
}

int mdb_tool_idl_add(
	BackendDB *be,
	MDB_cursor *mc,
	struct berval *keys,
	ID id )
{
	MDB_dbi dbi;
	mdb_tool_idl_cache *ic, itmp;
	mdb_tool_idl_cache_entry *ice;
	int i, rc, lcount;
	AttrIxInfo *ax = (AttrIxInfo *)mc;
	AttrInfo *ai = (AttrInfo *)ax->ai_ai;
	mc = ai->ai_cursor;

	dbi = ai->ai_dbi;
	for (i=0; keys[i].bv_val; i++) {
	itmp.kstr = keys[i];
	ic = ldap_tavl_find( ai->ai_root, &itmp, mdb_tool_idl_cmp );

	/* No entry yet, create one */
	if ( !ic ) {
		MDB_val key, data;
		ID nid;
		int rc;

		if ( ax->ai_clist ) {
			ic = ax->ai_clist;
			ax->ai_clist = ic->head;
		} else {
			ic = ch_malloc( sizeof( mdb_tool_idl_cache ) + itmp.kstr.bv_len + 4 );
		}
		ic->kstr.bv_len = itmp.kstr.bv_len;
		ic->kstr.bv_val = (char *)(ic+1);
		memcpy( ic->kstr.bv_val, itmp.kstr.bv_val, ic->kstr.bv_len );
		ic->head = ic->tail = NULL;
		ic->last = 0;
		ic->count = 0;
		ic->offset = 0;
		ic->flags = 0;
		ldap_tavl_insert( &ai->ai_root, ic, mdb_tool_idl_cmp,
			ldap_avl_dup_error );

		/* load existing key count here */
		key.mv_size = keys[i].bv_len;
		key.mv_data = keys[i].bv_val;
		rc = mdb_cursor_get( mc, &key, &data, MDB_SET );
		if ( rc == 0 ) {
			ic->flags |= WAS_FOUND;
			nid = *(ID *)data.mv_data;
			if ( nid == 0 ) {
				ic->count = MDB_idl_db_size+1;
				ic->flags |= WAS_RANGE;
			} else {
				size_t count;

				mdb_cursor_count( mc, &count );
				ic->count = count;
				ic->first = nid;
				ic->offset = count & (IDBLOCK-1);
			}
		}
	}
	/* are we a range already? */
	if ( ic->count > MDB_idl_db_size ) {
		ic->last = id;
		continue;
	/* Are we at the limit, and converting to a range? */
	} else if ( ic->count == MDB_idl_db_size ) {
		if ( ic->head ) {
			ic->tail->next = ax->ai_flist;
			ax->ai_flist = ic->head;
		}
		ic->head = ic->tail = NULL;
		ic->last = id;
		ic->count++;
		continue;
	}
	/* No free block, create that too */
	lcount = (ic->count-ic->offset) & (IDBLOCK-1);
	if ( !ic->tail || lcount == 0) {
		if ( ax->ai_flist ) {
			ice = ax->ai_flist;
			ax->ai_flist = ice->next;
		} else {
			ice = ch_malloc( sizeof( mdb_tool_idl_cache_entry ));
		}
		ice->next = NULL;
		if ( !ic->head ) {
			ic->head = ice;
		} else {
			ic->tail->next = ice;
		}
		ic->tail = ice;
		if ( lcount )
			ice->ids[lcount-1] = 0;
		if ( !ic->count )
			ic->first = id;
	}
	ice = ic->tail;
	if (!lcount || ice->ids[lcount-1] != id) {
		ice->ids[lcount] = id;
		ic->count++;
	}
	}

	return 0;
}
#endif /* MDB_TOOL_IDL_CACHING */

/* Upgrade from pre 2.4.34 dn2id format */

#include <ac/unistd.h>
#include <lutil_meter.h>

#define STACKSIZ	2048

typedef struct rec {
	ID id;
	size_t len;
	char rdn[512];
} rec;

static int
mdb_dn2id_upgrade( BackendDB *be ) {
	struct mdb_info *mi = (struct mdb_info *) be->be_private;
	MDB_txn *mt;
	MDB_cursor *mc = NULL;
	MDB_val key, data;
	int rc, writes=0, depth=0;
	int enable_meter = 0;
	ID id = 0, *num, count = 0;
	rec *stack;
	lutil_meter_t meter;

	if (!(mi->mi_flags & MDB_NEED_UPGRADE)) {
		Debug( LDAP_DEBUG_ANY, "database %s: No upgrade needed.\n",
			be->be_suffix[0].bv_val );
		return 0;
	}

	{
		MDB_stat st;

		mdb_stat(mdb_cursor_txn(cursor), mi->mi_dbis[MDB_ID2ENTRY], &st);
		if (!st.ms_entries) {
			/* Empty DB, nothing to upgrade? */
			return 0;
		}
		if (isatty(2))
			enable_meter = !lutil_meter_open(&meter,
				&lutil_meter_text_display,
				&lutil_meter_linear_estimator,
				st.ms_entries);
	}

	num = ch_malloc(STACKSIZ * (sizeof(ID) + sizeof(rec)));
	stack = (rec *)(num + STACKSIZ);

	rc = mdb_txn_begin(mi->mi_dbenv, NULL, 0, &mt);
	if (rc) {
		Debug(LDAP_DEBUG_ANY, "mdb_dn2id_upgrade: mdb_txn_begin failed, %s (%d)\n",
			mdb_strerror(rc), rc );
		goto leave;
	}
	rc = mdb_cursor_open(mt, mi->mi_dbis[MDB_DN2ID], &mc);
	if (rc) {
		Debug(LDAP_DEBUG_ANY, "mdb_dn2id_upgrade: mdb_cursor_open failed, %s (%d)\n",
			mdb_strerror(rc), rc );
		goto leave;
	}

	key.mv_size = sizeof(ID);
	/* post-order depth-first update */
	for(;;) {
		size_t dkids;
		unsigned char *ptr;

		/* visit */
		key.mv_data = &id;
		stack[depth].id = id;
		rc = mdb_cursor_get(mc, &key, &data, MDB_SET);
		if (rc) {
			Debug(LDAP_DEBUG_ANY, "mdb_dn2id_upgrade: mdb_cursor_get failed, %s (%d)\n",
				mdb_strerror(rc), rc );
			goto leave;
		}
		num[depth] = 1;

		rc = mdb_cursor_count(mc, &dkids);
		if (rc) {
			Debug(LDAP_DEBUG_ANY, "mdb_dn2id_upgrade: mdb_cursor_count failed, %s (%d)\n",
				mdb_strerror(rc), rc );
			goto leave;
		}
		if (dkids > 1) {
			rc = mdb_cursor_get(mc, &key, &data, MDB_NEXT_DUP);
down:
			ptr = (unsigned char *)data.mv_data + data.mv_size - sizeof(ID);
			memcpy(&id, ptr, sizeof(ID));
			depth++;
			memcpy(stack[depth].rdn, data.mv_data, data.mv_size);
			stack[depth].len = data.mv_size;
			continue;
		}


		/* pop: write updated count, advance to next node */
pop:
		/* update superior counts */
		if (depth)
			num[depth-1] += num[depth];

		key.mv_data = &id;
		id = stack[depth-1].id;
		data.mv_data = stack[depth].rdn;
		data.mv_size = stack[depth].len;
		rc = mdb_cursor_get(mc, &key, &data, MDB_GET_BOTH);
		if (rc) {
			Debug(LDAP_DEBUG_ANY, "mdb_dn2id_upgrade: mdb_cursor_get(BOTH) failed, %s (%d)\n",
				mdb_strerror(rc), rc );
			goto leave;
		}
		data.mv_data = stack[depth].rdn;
		ptr = (unsigned char *)data.mv_data + data.mv_size;
		memcpy(ptr, &num[depth], sizeof(ID));
		data.mv_size += sizeof(ID);
		rc = mdb_cursor_del(mc, 0);
		if (rc) {
			Debug(LDAP_DEBUG_ANY, "mdb_dn2id_upgrade: mdb_cursor_del failed, %s (%d)\n",
				mdb_strerror(rc), rc );
			goto leave;
		}
		rc = mdb_cursor_put(mc, &key, &data, 0);
		if (rc) {
			Debug(LDAP_DEBUG_ANY, "mdb_dn2id_upgrade: mdb_cursor_put failed, %s (%d)\n",
				mdb_strerror(rc), rc );
			goto leave;
		}
		count++;
#if 1
		if (enable_meter)
			lutil_meter_update(&meter, count, 0);
#else
		{
			int len;
			ptr = data.mv_data;
			len = (ptr[0] & 0x7f) << 8 | ptr[1];
			printf("ID: %zu, %zu, %.*s\n", stack[depth].id, num[depth], len, ptr+2);
		}
#endif
		writes++;
		if (writes == 1000) {
			mdb_cursor_close(mc);
			rc = mdb_txn_commit(mt);
			if (rc) {
				Debug(LDAP_DEBUG_ANY, "mdb_dn2id_upgrade: mdb_txn_commit failed, %s (%d)\n",
					mdb_strerror(rc), rc );
				goto leave;
			}
			rc = mdb_txn_begin(mi->mi_dbenv, NULL, 0, &mt);
			if (rc) {
				Debug(LDAP_DEBUG_ANY, "mdb_dn2id_upgrade: mdb_txn_begin(2) failed, %s (%d)\n",
					mdb_strerror(rc), rc );
				goto leave;
			}
			rc = mdb_cursor_open(mt, mi->mi_dbis[MDB_DN2ID], &mc);
			if (rc) {
				Debug(LDAP_DEBUG_ANY, "mdb_dn2id_upgrade: mdb_cursor_open(2) failed, %s (%d)\n",
					mdb_strerror(rc), rc );
				goto leave;
			}
			rc = mdb_cursor_get(mc, &key, &data, MDB_GET_BOTH);
			if (rc) {
				Debug(LDAP_DEBUG_ANY, "mdb_dn2id_upgrade: mdb_cursor_get(2) failed, %s (%d)\n",
					mdb_strerror(rc), rc );
				goto leave;
			}
			writes = 0;
		}
		depth--;

		rc = mdb_cursor_get(mc, &key, &data, MDB_NEXT_DUP);
		if (rc == 0)
			goto down;
		rc = 0;
		if (depth)
			goto pop;
		else
			break;
	}
leave:
	mdb_cursor_close(mc);
	if (mt) {
		int r2;
		r2 = mdb_txn_commit(mt);
		if (r2) {
			Debug(LDAP_DEBUG_ANY, "mdb_dn2id_upgrade: mdb_txn_commit(2) failed, %s (%d)\n",
				mdb_strerror(r2), r2 );
			if (!rc)
				rc = r2;
		}
	}
	ch_free(num);
	if (enable_meter) {
		lutil_meter_update(&meter, count, 1);
		lutil_meter_close(&meter);
	}
	return rc;
}
