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https://git.openldap.org/openldap/openldap.git
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438 lines
11 KiB
C
438 lines
11 KiB
C
/* ctxcsn.c -- back-bdb Context CSN Management Routines */
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/* $OpenLDAP$ */
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/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
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*
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* Copyright 2003 The OpenLDAP Foundation.
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* Portions Copyright 2003 IBM Corporation.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted only as authorized by the OpenLDAP
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* Public License.
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*
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* A copy of this license is available in the file LICENSE in the
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* top-level directory of the distribution or, alternatively, at
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* <http://www.OpenLDAP.org/license.html>.
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*/
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#include "portable.h"
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#include <stdio.h>
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#include <ac/string.h>
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#include <ac/time.h>
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#include "lutil.h"
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#include "back-bdb.h"
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#include "external.h"
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int
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bdb_csn_commit(
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Operation *op,
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SlapReply *rs,
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DB_TXN *tid,
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EntryInfo *ei,
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EntryInfo **suffix_ei,
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Entry **ctxcsn_e,
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int *ctxcsn_added,
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u_int32_t locker
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)
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{
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struct bdb_info *bdb = (struct bdb_info *) op->o_bd->be_private;
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struct berval ctxcsn_ndn = { 0, NULL };
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EntryInfo *ctxcsn_ei = NULL;
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DB_LOCK ctxcsn_lock;
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struct berval max_committed_csn;
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DB_LOCK suffix_lock;
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int rc, ret;
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ID ctxcsn_id;
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Entry *e;
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char textbuf[SLAP_TEXT_BUFLEN];
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size_t textlen = sizeof textbuf;
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EntryInfo *eip = NULL;
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if ( ei ) {
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e = ei->bei_e;
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}
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build_new_dn( &ctxcsn_ndn, &op->o_bd->be_nsuffix[0],
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(struct berval *)&slap_ldapsync_cn_bv, op->o_tmpmemctx );
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rc = bdb_dn2entry( op, tid, &ctxcsn_ndn, &ctxcsn_ei,
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1, locker, &ctxcsn_lock );
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*ctxcsn_e = ctxcsn_ei->bei_e;
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op->o_tmpfree( ctxcsn_ndn.bv_val, op->o_tmpmemctx );
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slap_get_commit_csn( op, &max_committed_csn );
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if ( max_committed_csn.bv_val == NULL ) {
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return BDB_CSN_COMMIT;
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}
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*ctxcsn_added = 0;
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switch( rc ) {
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case 0:
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if ( !*ctxcsn_e ) {
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rs->sr_err = LDAP_OTHER;
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rs->sr_text = "context csn not present";
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ch_free( max_committed_csn.bv_val );
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return BDB_CSN_ABORT;
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} else {
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Modifications mod;
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struct berval modvals[2];
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Entry dummy;
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modvals[0] = max_committed_csn;
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modvals[1].bv_val = NULL;
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modvals[1].bv_len = 0;
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mod.sml_op = LDAP_MOD_REPLACE;
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mod.sml_bvalues = modvals;
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mod.sml_nvalues = NULL;
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mod.sml_desc = slap_schema.si_ad_contextCSN;
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mod.sml_type = mod.sml_desc->ad_cname;
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mod.sml_next = NULL;
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dummy = **ctxcsn_e;
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ret = bdb_modify_internal( op, tid, &mod, &dummy,
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&rs->sr_text, textbuf, textlen );
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ch_free( max_committed_csn.bv_val );
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if ( ret != LDAP_SUCCESS ) {
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#ifdef NEW_LOGGING
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LDAP_LOG ( OPERATION, ERR,
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"bdb_csn_commit: modify failed (%d)\n", rs->sr_err, 0, 0 );
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#else
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Debug( LDAP_DEBUG_TRACE,
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"bdb_csn_commit: modify failed (%d)\n", rs->sr_err, 0, 0 );
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#endif
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switch( ret ) {
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case DB_LOCK_DEADLOCK:
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case DB_LOCK_NOTGRANTED:
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goto rewind;
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default:
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return BDB_CSN_ABORT;
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}
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}
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ret = bdb_id2entry_update( op->o_bd, tid, &dummy );
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switch ( ret ) {
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case 0 :
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break;
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case DB_LOCK_DEADLOCK :
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case DB_LOCK_NOTGRANTED :
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goto rewind;
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default :
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rs->sr_err = ret;
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rs->sr_text = "context csn update failed";
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return BDB_CSN_ABORT;
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}
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bdb_cache_modify( *ctxcsn_e, dummy.e_attrs, bdb->bi_dbenv, locker, &ctxcsn_lock );
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}
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break;
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case DB_NOTFOUND:
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if ( op->o_tag == LDAP_REQ_ADD &&
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be_issuffix( op->o_bd, &op->oq_add.rs_e->e_nname )) {
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*suffix_ei = NULL;
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eip = (EntryInfo *) ch_calloc( 1, sizeof( EntryInfo ));
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eip->bei_id = op->oq_add.rs_e->e_id;
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} else {
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eip = *suffix_ei = ctxcsn_ei;
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}
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/* This serializes add. But this case is very rare : only once. */
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rs->sr_err = bdb_next_id( op->o_bd, tid, &ctxcsn_id );
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if ( rs->sr_err != 0 ) {
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#ifdef NEW_LOGGING
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LDAP_LOG ( OPERATION, ERR,
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"bdb_add: next_id failed (%d)\n", rs->sr_err, 0, 0 );
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#else
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Debug( LDAP_DEBUG_TRACE,
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"bdb_add: next_id failed (%d)\n", rs->sr_err, 0, 0 );
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#endif
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rs->sr_err = LDAP_OTHER;
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rs->sr_text = "internal error";
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return BDB_CSN_ABORT;
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}
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*ctxcsn_e = slap_create_context_csn_entry( op->o_bd, &max_committed_csn );
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ch_free( max_committed_csn.bv_val );
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(*ctxcsn_e)->e_id = ctxcsn_id;
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*ctxcsn_added = 1;
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ret = bdb_dn2id_add( op, tid, eip, *ctxcsn_e );
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switch ( ret ) {
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case 0 :
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break;
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case DB_LOCK_DEADLOCK :
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case DB_LOCK_NOTGRANTED :
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goto rewind;
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case DB_KEYEXIST :
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rs->sr_err = LDAP_OTHER;
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rs->sr_text = "context csn exists before contex prefix does";
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return BDB_CSN_ABORT;
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default :
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rs->sr_err = LDAP_OTHER;
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rs->sr_text = "context csn store failed";
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return BDB_CSN_ABORT;
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}
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if ( *suffix_ei == NULL ) {
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ch_free( eip );
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}
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ret = bdb_id2entry_add( op->o_bd, tid, *ctxcsn_e );
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switch ( ret ) {
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case 0 :
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break;
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case DB_LOCK_DEADLOCK :
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case DB_LOCK_NOTGRANTED :
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goto rewind;
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default :
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rs->sr_err = LDAP_OTHER;
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rs->sr_text = "context csn store failed";
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return BDB_CSN_ABORT;
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}
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ret = bdb_index_entry_add( op, tid, *ctxcsn_e );
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switch ( ret ) {
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case 0 :
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break;
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case DB_LOCK_DEADLOCK :
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case DB_LOCK_NOTGRANTED :
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goto rewind;
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default :
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rs->sr_err = LDAP_OTHER;
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rs->sr_text = "context csn indexing failed";
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return BDB_CSN_ABORT;
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}
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break;
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case DB_LOCK_DEADLOCK:
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case DB_LOCK_NOTGRANTED:
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#ifdef NEW_LOGGING
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LDAP_LOG( OPERATION, ERR,
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"bdb_csn_commit : bdb_dn2entry retry\n", 0, 0, 0 );
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#else
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Debug( LDAP_DEBUG_TRACE,
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"bdb_csn_commit : bdb_dn2entry retry\n", 0, 0, 0 );
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#endif
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goto rewind;
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case LDAP_BUSY:
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rs->sr_err = rc;
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rs->sr_text = "ldap server busy";
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return BDB_CSN_ABORT;
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default:
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rs->sr_err = LDAP_OTHER;
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rs->sr_text = "internal error";
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return BDB_CSN_ABORT;
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}
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return BDB_CSN_COMMIT;
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rewind :
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slap_rewind_commit_csn( op );
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return BDB_CSN_RETRY;
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}
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int
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bdb_get_commit_csn(
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Operation *op,
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SlapReply *rs,
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struct berval **search_context_csn,
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u_int32_t locker,
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DB_LOCK *ctxcsn_lock
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)
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{
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struct bdb_info *bdb = (struct bdb_info *) op->o_bd->be_private;
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struct berval ctxcsn_ndn = BER_BVNULL;
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struct berval csn = BER_BVNULL;
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EntryInfo *ctxcsn_ei = NULL;
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EntryInfo *suffix_ei = NULL;
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Entry *ctxcsn_e = NULL;
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DB_TXN *ltid = NULL;
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Attribute *csn_a;
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char gid[DB_XIDDATASIZE];
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char csnbuf[ LDAP_LUTIL_CSNSTR_BUFSIZE ];
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int num_retries = 0;
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int ctxcsn_added = 0;
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int rc;
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struct sync_cookie syncCookie = { NULL, -1, NULL};
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syncinfo_t *si;
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if ( op->o_sync_mode != SLAP_SYNC_NONE &&
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!LDAP_STAILQ_EMPTY( &op->o_bd->be_syncinfo )) {
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char substr[67];
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struct berval bv;
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LDAP_STAILQ_FOREACH( si, &op->o_bd->be_syncinfo, si_next ) {
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sprintf( substr, "cn=syncrepl%ld", si->si_rid );
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ber_str2bv( substr, 0, 0, &bv );
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build_new_dn( &ctxcsn_ndn, &op->o_bd->be_nsuffix[0], &bv, NULL );
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consumer_ctxcsn_retry :
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rs->sr_err = bdb_dn2entry( op, NULL, &ctxcsn_ndn, &ctxcsn_ei,
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0, locker, ctxcsn_lock );
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switch(rs->sr_err) {
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case 0:
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ch_free( ctxcsn_ndn.bv_val );
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ctxcsn_ndn.bv_val = NULL;
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if ( ctxcsn_ei ) {
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ctxcsn_e = ctxcsn_ei->bei_e;
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}
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break;
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case LDAP_BUSY:
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ch_free( ctxcsn_ndn.bv_val );
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LOCK_ID_FREE (bdb->bi_dbenv, locker );
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return LDAP_BUSY;
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case DB_LOCK_DEADLOCK:
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case DB_LOCK_NOTGRANTED:
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goto consumer_ctxcsn_retry;
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case DB_NOTFOUND:
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ch_free( ctxcsn_ndn.bv_val );
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LOCK_ID_FREE( bdb->bi_dbenv, locker );
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return LDAP_OTHER;
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default:
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ch_free( ctxcsn_ndn.bv_val );
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ctxcsn_ndn.bv_val = NULL;
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LOCK_ID_FREE (bdb->bi_dbenv, locker );
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return LDAP_OTHER;
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}
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if ( ctxcsn_e ) {
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csn_a = attr_find( ctxcsn_e->e_attrs,
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slap_schema.si_ad_syncreplCookie );
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if ( csn_a ) {
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struct berval cookie;
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const char *text;
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int match = -1;
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ber_dupbv( &cookie, &csn_a->a_vals[0] );
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ber_bvarray_add( &syncCookie.octet_str, &cookie );
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slap_parse_sync_cookie( &syncCookie );
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if ( *search_context_csn &&
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(*search_context_csn)->bv_val != NULL )
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{
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value_match( &match, slap_schema.si_ad_entryCSN,
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slap_schema.si_ad_entryCSN->ad_type->sat_ordering,
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SLAP_MR_VALUE_OF_ATTRIBUTE_SYNTAX,
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syncCookie.ctxcsn, *search_context_csn, &text );
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}
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if ( match < 0 ) {
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/* set search_context_csn to the
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smallest syncrepl cookie value */
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if ( *search_context_csn ) {
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ch_free( (*search_context_csn)->bv_val );
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ch_free( *search_context_csn );
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}
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*search_context_csn = ber_dupbv( NULL,
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syncCookie.ctxcsn );
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}
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slap_sync_cookie_free( &syncCookie, 0 );
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} else {
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*search_context_csn = NULL;
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}
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} else {
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*search_context_csn = NULL;
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}
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}
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} else if ( op->o_sync_mode != SLAP_SYNC_NONE &&
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LDAP_STAILQ_EMPTY( &op->o_bd->be_syncinfo )) {
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build_new_dn( &ctxcsn_ndn, &op->o_bd->be_nsuffix[0],
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(struct berval *)&slap_ldapsync_cn_bv, NULL );
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provider_ctxcsn_retry :
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rs->sr_err = bdb_dn2entry( op, NULL, &ctxcsn_ndn, &ctxcsn_ei,
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0, locker, ctxcsn_lock );
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switch(rs->sr_err) {
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case 0:
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ch_free( ctxcsn_ndn.bv_val );
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if ( ctxcsn_ei ) {
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ctxcsn_e = ctxcsn_ei->bei_e;
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}
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break;
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case LDAP_BUSY:
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ch_free( ctxcsn_ndn.bv_val );
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LOCK_ID_FREE (bdb->bi_dbenv, locker );
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return LDAP_BUSY;
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case DB_LOCK_DEADLOCK:
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case DB_LOCK_NOTGRANTED:
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goto provider_ctxcsn_retry;
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case DB_NOTFOUND:
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snprintf( gid, sizeof( gid ), "%s-%08lx-%08lx",
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bdb_uuid.bv_val, (long) op->o_connid, (long) op->o_opid );
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slap_get_csn( op, csnbuf, sizeof(csnbuf), &csn, 1 );
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if ( 0 ) {
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txn_retry:
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rs->sr_err = TXN_ABORT( ltid );
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if ( rs->sr_err != 0 ) {
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rs->sr_err = LDAP_OTHER;
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return rs->sr_err;
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}
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ldap_pvt_thread_yield();
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bdb_trans_backoff( ++num_retries );
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}
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rs->sr_err = TXN_BEGIN( bdb->bi_dbenv, NULL,
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<id, bdb->bi_db_opflags );
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if ( rs->sr_err != 0 ) {
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rs->sr_err = LDAP_OTHER;
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return rs->sr_err;
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}
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rs->sr_err = bdb_csn_commit( op, rs, ltid, NULL, &suffix_ei,
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&ctxcsn_e, &ctxcsn_added, locker );
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switch( rs->sr_err ) {
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case BDB_CSN_ABORT:
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LOCK_ID_FREE( bdb->bi_dbenv, locker );
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return LDAP_OTHER;
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case BDB_CSN_RETRY:
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goto txn_retry;
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}
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rs->sr_err = TXN_PREPARE( ltid, gid );
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if ( rs->sr_err != 0 ) {
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rs->sr_err = LDAP_OTHER;
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return rs->sr_err;
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}
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bdb_cache_add( bdb, suffix_ei, ctxcsn_e,
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(struct berval *)&slap_ldapsync_cn_bv, locker );
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rs->sr_err = TXN_COMMIT( ltid, 0 );
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if ( rs->sr_err != 0 ) {
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rs->sr_err = LDAP_OTHER;
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return rs->sr_err;
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}
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rs->sr_err = bdb_dn2entry( op, NULL, &ctxcsn_ndn, &ctxcsn_ei,
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0, locker, ctxcsn_lock );
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ch_free( ctxcsn_ndn.bv_val );
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if ( ctxcsn_ei ) {
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ctxcsn_e = ctxcsn_ei->bei_e;
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}
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break;
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default:
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ch_free( ctxcsn_ndn.bv_val );
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LOCK_ID_FREE (bdb->bi_dbenv, locker );
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return LDAP_OTHER;
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}
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if ( ctxcsn_e ) {
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csn_a = attr_find( ctxcsn_e->e_attrs,
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slap_schema.si_ad_contextCSN );
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if ( csn_a ) {
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*search_context_csn = ber_dupbv( NULL, &csn_a->a_vals[0] );
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} else {
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*search_context_csn = NULL;
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}
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} else {
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*search_context_csn = NULL;
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}
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}
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return LDAP_SUCCESS;
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}
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