openldap/servers/slapd/back-bdb/ctxcsn.c

443 lines
11 KiB
C

/* ctxcsn.c -- back-bdb Context CSN Management Routines */
/* $OpenLDAP$ */
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
*
* Copyright 2003-2004 The OpenLDAP Foundation.
* Portions Copyright 2003 IBM Corporation.
* 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/time.h>
#include "lutil.h"
#include "back-bdb.h"
#include "external.h"
int
bdb_csn_commit(
Operation *op,
SlapReply *rs,
DB_TXN *tid,
EntryInfo *ei,
EntryInfo **suffix_ei,
Entry **ctxcsn_e,
int *ctxcsn_added,
u_int32_t locker
)
{
struct bdb_info *bdb = (struct bdb_info *) op->o_bd->be_private;
EntryInfo *ctxcsn_ei = NULL;
DB_LOCK ctxcsn_lock;
struct berval max_committed_csn;
DB_LOCK suffix_lock;
int rc, ret;
ID ctxcsn_id;
Entry *e;
char textbuf[SLAP_TEXT_BUFLEN];
size_t textlen = sizeof textbuf;
EntryInfo *eip = NULL;
assert( !BER_BVISNULL( &op->o_bd->be_context_csn ) );
if ( ei ) {
e = ei->bei_e;
}
rc = bdb_dn2entry( op, tid, &op->o_bd->be_context_csn, &ctxcsn_ei,
1, locker, &ctxcsn_lock );
switch( rc ) {
case 0:
case DB_NOTFOUND:
break;
case DB_LOCK_DEADLOCK:
case DB_LOCK_NOTGRANTED:
return BDB_CSN_RETRY;
default:
return BDB_CSN_ABORT;
}
*ctxcsn_e = ctxcsn_ei->bei_e;
slap_get_commit_csn( op, &max_committed_csn );
if ( max_committed_csn.bv_val == NULL ) {
return BDB_CSN_COMMIT;
}
*ctxcsn_added = 0;
switch( rc ) {
case 0:
if ( !*ctxcsn_e ) {
rs->sr_err = LDAP_OTHER;
rs->sr_text = "context csn not present";
op->o_tmpfree( max_committed_csn.bv_val, op->o_tmpmemctx );
return BDB_CSN_ABORT;
} else {
Modifications mod;
struct berval modvals[2];
Entry dummy;
modvals[0] = max_committed_csn;
modvals[1].bv_val = NULL;
modvals[1].bv_len = 0;
mod.sml_op = LDAP_MOD_REPLACE;
mod.sml_values = modvals;
mod.sml_nvalues = NULL;
mod.sml_desc = slap_schema.si_ad_contextCSN;
mod.sml_type = mod.sml_desc->ad_cname;
mod.sml_next = NULL;
dummy = **ctxcsn_e;
ret = bdb_modify_internal( op, tid, &mod, &dummy,
&rs->sr_text, textbuf, textlen );
op->o_tmpfree( max_committed_csn.bv_val, op->o_tmpmemctx );
if ( ret != LDAP_SUCCESS ) {
#ifdef NEW_LOGGING
LDAP_LOG ( OPERATION, ERR,
"bdb_csn_commit: modify failed (%d)\n", rs->sr_err, 0, 0 );
#else
Debug( LDAP_DEBUG_TRACE,
"bdb_csn_commit: modify failed (%d)\n", rs->sr_err, 0, 0 );
#endif
switch( ret ) {
case DB_LOCK_DEADLOCK:
case DB_LOCK_NOTGRANTED:
goto rewind;
default:
return BDB_CSN_ABORT;
}
}
ret = bdb_id2entry_update( op->o_bd, tid, &dummy );
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";
return BDB_CSN_ABORT;
}
bdb_cache_modify( *ctxcsn_e, dummy.e_attrs, bdb->bi_dbenv, locker, &ctxcsn_lock );
}
break;
case DB_NOTFOUND:
if ( op->o_tag == LDAP_REQ_ADD &&
be_issuffix( op->o_bd, &op->oq_add.rs_e->e_nname )) {
*suffix_ei = NULL;
eip = (EntryInfo *) ch_calloc( 1, sizeof( EntryInfo ));
eip->bei_id = op->oq_add.rs_e->e_id;
} else {
eip = *suffix_ei = ctxcsn_ei;
}
/* This serializes add. But this case is very rare : only once. */
rs->sr_err = bdb_next_id( op->o_bd, tid, &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";
return BDB_CSN_ABORT;
}
*ctxcsn_e = slap_create_context_csn_entry( op->o_bd, &max_committed_csn );
op->o_tmpfree( max_committed_csn.bv_val, op->o_tmpmemctx );
(*ctxcsn_e)->e_id = ctxcsn_id;
*ctxcsn_added = 1;
ret = bdb_dn2id_add( op, tid, eip, *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 context prefix does";
return BDB_CSN_ABORT;
default :
rs->sr_err = LDAP_OTHER;
rs->sr_text = "context csn store failed";
return BDB_CSN_ABORT;
}
if ( *suffix_ei == NULL ) {
ch_free( eip );
}
ret = bdb_id2entry_add( op->o_bd, tid, *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";
return BDB_CSN_ABORT;
}
ret = bdb_index_entry_add( op, tid, *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";
return BDB_CSN_ABORT;
}
break;
case DB_LOCK_DEADLOCK:
case DB_LOCK_NOTGRANTED:
#ifdef NEW_LOGGING
LDAP_LOG( OPERATION, ERR,
"bdb_csn_commit : bdb_dn2entry retry\n", 0, 0, 0 );
#else
Debug( LDAP_DEBUG_TRACE,
"bdb_csn_commit : bdb_dn2entry retry\n", 0, 0, 0 );
#endif
goto rewind;
case LDAP_BUSY:
rs->sr_err = rc;
rs->sr_text = "ldap server busy";
return BDB_CSN_ABORT;
default:
rs->sr_err = LDAP_OTHER;
rs->sr_text = "internal error";
return BDB_CSN_ABORT;
}
return BDB_CSN_COMMIT;
rewind :
slap_rewind_commit_csn( op );
return BDB_CSN_RETRY;
}
int
bdb_get_commit_csn(
Operation *op,
SlapReply *rs,
struct berval **search_context_csn,
u_int32_t locker,
DB_LOCK *ctxcsn_lock
)
{
struct bdb_info *bdb = (struct bdb_info *) op->o_bd->be_private;
struct berval csn = BER_BVNULL;
EntryInfo *ctxcsn_ei = NULL;
EntryInfo *suffix_ei = NULL;
Entry *ctxcsn_e = NULL;
DB_TXN *ltid = NULL;
Attribute *csn_a;
char gid[DB_XIDDATASIZE];
char csnbuf[ LDAP_LUTIL_CSNSTR_BUFSIZE ];
int num_retries = 0;
int ctxcsn_added = 0;
int rc;
struct sync_cookie syncCookie = { NULL, -1, NULL};
syncinfo_t *si;
u_int32_t ctxcsn_locker = 0;
if ( op->o_sync_mode != SLAP_SYNC_NONE &&
!LDAP_STAILQ_EMPTY( &op->o_bd->be_syncinfo )) {
char substr[67];
struct berval ctxcsn_ndn = BER_BVNULL;
struct berval bv;
LDAP_STAILQ_FOREACH( si, &op->o_bd->be_syncinfo, si_next ) {
sprintf( substr, "cn=syncrepl%ld", si->si_rid );
ber_str2bv( substr, 0, 0, &bv );
build_new_dn( &ctxcsn_ndn, &op->o_bd->be_nsuffix[0], &bv, op->o_tmpmemctx );
consumer_ctxcsn_retry :
rs->sr_err = bdb_dn2entry( op, NULL, &ctxcsn_ndn, &ctxcsn_ei,
0, locker, ctxcsn_lock );
switch(rs->sr_err) {
case DB_LOCK_DEADLOCK:
case DB_LOCK_NOTGRANTED:
goto consumer_ctxcsn_retry;
case 0:
op->o_tmpfree( ctxcsn_ndn.bv_val, op->o_tmpmemctx );
ctxcsn_ndn.bv_val = NULL;
if ( ctxcsn_ei ) {
ctxcsn_e = ctxcsn_ei->bei_e;
}
break;
case DB_NOTFOUND:
default:
rs->sr_err = LDAP_OTHER;
case LDAP_BUSY:
op->o_tmpfree( ctxcsn_ndn.bv_val, op->o_tmpmemctx );
ctxcsn_ndn.bv_val = NULL;
goto done;
}
if ( ctxcsn_e ) {
csn_a = attr_find( ctxcsn_e->e_attrs,
slap_schema.si_ad_syncreplCookie );
if ( csn_a ) {
struct berval cookie;
const char *text;
int match = -1;
ber_dupbv( &cookie, &csn_a->a_vals[0] );
ber_bvarray_add( &syncCookie.octet_str, &cookie );
slap_parse_sync_cookie( &syncCookie );
if ( *search_context_csn &&
(*search_context_csn)->bv_val != NULL )
{
value_match( &match, slap_schema.si_ad_entryCSN,
slap_schema.si_ad_entryCSN->ad_type->sat_ordering,
SLAP_MR_VALUE_OF_ATTRIBUTE_SYNTAX,
syncCookie.ctxcsn, *search_context_csn, &text );
}
if ( match < 0 ) {
/* set search_context_csn to the
smallest syncrepl cookie value */
if ( *search_context_csn ) {
ch_free( (*search_context_csn)->bv_val );
ch_free( *search_context_csn );
}
*search_context_csn = ber_dupbv( NULL,
syncCookie.ctxcsn );
}
slap_sync_cookie_free( &syncCookie, 0 );
} else {
*search_context_csn = NULL;
}
} else {
*search_context_csn = NULL;
}
}
} else if ( op->o_sync_mode != SLAP_SYNC_NONE &&
LDAP_STAILQ_EMPTY( &op->o_bd->be_syncinfo )) {
provider_ctxcsn_retry :
rs->sr_err = bdb_dn2entry( op, NULL, &op->o_bd->be_context_csn, &ctxcsn_ei,
0, locker, ctxcsn_lock );
switch(rs->sr_err) {
case 0:
if ( ctxcsn_ei ) {
ctxcsn_e = ctxcsn_ei->bei_e;
}
break;
case LDAP_BUSY:
goto done;
case DB_LOCK_DEADLOCK:
case DB_LOCK_NOTGRANTED:
goto provider_ctxcsn_retry;
case DB_NOTFOUND:
snprintf( gid, sizeof( gid ), "%s-%08lx-%08lx",
bdb_uuid.bv_val, (long) op->o_connid, (long) op->o_opid );
slap_get_csn( op, csnbuf, sizeof(csnbuf), &csn, 1 );
if ( 0 ) {
txn_retry:
rs->sr_err = TXN_ABORT( ltid );
ltid = NULL;
if ( rs->sr_err != 0 ) {
rs->sr_err = LDAP_OTHER;
goto done;
}
ldap_pvt_thread_yield();
bdb_trans_backoff( ++num_retries );
}
rs->sr_err = TXN_BEGIN( bdb->bi_dbenv, NULL,
&ltid, bdb->bi_db_opflags );
if ( rs->sr_err != 0 ) {
rs->sr_err = LDAP_OTHER;
goto done;
}
ctxcsn_locker = TXN_ID ( ltid );
rs->sr_err = bdb_csn_commit( op, rs, ltid, NULL, &suffix_ei,
&ctxcsn_e, &ctxcsn_added, ctxcsn_locker );
switch( rs->sr_err ) {
case BDB_CSN_ABORT:
rs->sr_err = LDAP_OTHER;
goto done;
case BDB_CSN_RETRY:
goto txn_retry;
}
rs->sr_err = TXN_PREPARE( ltid, gid );
if ( rs->sr_err != 0 ) {
rs->sr_err = LDAP_OTHER;
goto done;
}
bdb_cache_add( bdb, suffix_ei, ctxcsn_e,
(struct berval *)&slap_ldapsync_cn_bv, ctxcsn_locker );
rs->sr_err = TXN_COMMIT( ltid, 0 );
if ( rs->sr_err != 0 ) {
rs->sr_err = LDAP_OTHER;
goto done;
}
rs->sr_err = bdb_dn2entry( op, NULL, &op->o_bd->be_context_csn, &ctxcsn_ei,
0, ctxcsn_locker, ctxcsn_lock );
if ( ctxcsn_ei ) {
ctxcsn_e = ctxcsn_ei->bei_e;
}
break;
default:
rs->sr_err = LDAP_OTHER;
goto done;
}
if ( ctxcsn_e ) {
csn_a = attr_find( ctxcsn_e->e_attrs,
slap_schema.si_ad_contextCSN );
if ( csn_a ) {
*search_context_csn = ber_dupbv( NULL, &csn_a->a_vals[0] );
} else {
*search_context_csn = NULL;
}
} else {
*search_context_csn = NULL;
}
}
ltid = NULL;
rs->sr_err = LDAP_SUCCESS;
done:
if( ltid != NULL ) {
TXN_ABORT( ltid );
}
return rs->sr_err;
}