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ITS#6716: Keep sessionlog sorted by csn, compare mincsn with head.

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This commit is contained in:
Rein Tollevik 2010-12-12 18:12:05 +00:00
parent 439030a16d
commit b4aa8dc68c
1 changed files with 35 additions and 9 deletions
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44
servers/slapd/overlays/syncprov.c
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@ -113,7 +113,6 @@ typedef struct slog_entry {
} slog_entry;
typedef struct sessionlog {
struct berval sl_mincsn;
int sl_num;
int sl_size;
slog_entry *sl_head;
@ -1501,6 +1500,23 @@ syncprov_add_slog( Operation *op )
sl = si->si_logs;
{
if ( BER_BVISEMPTY( &op->o_csn ) ) {
/* During the syncrepl refresh phase we can receive operations
* without a csn. We cannot reliably determine the consumers
* state with respect to such operations, so we ignore them and
* wipe out anything in the log if we see them.
*/
ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
while ( se = sl->sl_head ) {
sl->sl_head = se->se_next;
ch_free( se );
}
sl->sl_tail = NULL;
sl->sl_num = 0;
ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
return;
}
/* Allocate a record. UUIDs are not NUL-terminated. */
se = ch_malloc( sizeof( slog_entry ) + opc->suuid.bv_len +
op->o_csn.bv_len + 1 );
@ -1519,17 +1535,29 @@ syncprov_add_slog( Operation *op )
ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
if ( sl->sl_head ) {
sl->sl_tail->se_next = se;
/* Keep the list in csn order. */
if ( ber_bvcmp( &sl->sl_tail->se_csn, &se->se_csn ) <= 0 ) {
sl->sl_tail->se_next = se;
sl->sl_tail = se;
} else {
slog_entry **sep;
for ( sep = &sl->sl_head; *sep; sep = &(*sep)->se_next ) {
if ( ber_bvcmp( &se->se_csn, &(*sep)->se_csn ) < 0 ) {
se->se_next = *sep;
*sep = se;
break;
}
}
}
} else {
sl->sl_head = se;
sl->sl_tail = se;
}
sl->sl_tail = se;
sl->sl_num++;
while ( sl->sl_num > sl->sl_size ) {
se = sl->sl_head;
sl->sl_head = se->se_next;
strcpy( sl->sl_mincsn.bv_val, se->se_csn.bv_val );
sl->sl_mincsn.bv_len = se->se_csn.bv_len;
ch_free( se );
sl->sl_num--;
}
@ -2566,7 +2594,7 @@ no_change: if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
/* Are there any log entries, and is the consumer state
* present in the session log?
*/
if ( sl->sl_num > 0 && ber_bvcmp( &mincsn, &sl->sl_mincsn ) >= 0 ) {
if ( sl->sl_num > 0 && ber_bvcmp( &mincsn, &sl->sl_head->se_csn ) >= 0 ) {
do_present = 0;
/* mutex is unlocked in playlog */
syncprov_playlog( op, rs, sl, srs, ctxcsn, numcsns, sids );
@ -2908,9 +2936,7 @@ sp_cf_gen(ConfigArgs *c)
}
sl = si->si_logs;
if ( !sl ) {
sl = ch_malloc( sizeof( sessionlog ) + LDAP_PVT_CSNSTR_BUFSIZE );
sl->sl_mincsn.bv_val = (char *)(sl+1);
sl->sl_mincsn.bv_len = 0;
sl = ch_malloc( sizeof( sessionlog ) );
sl->sl_num = 0;
sl->sl_head = sl->sl_tail = NULL;
ldap_pvt_thread_mutex_init( &sl->sl_mutex );