/* ldbmcache.c - maintain a cache of open ldbm files */
/* $OpenLDAP$ */
/*
- * Copyright 1998-2000 The OpenLDAP Foundation, All Rights Reserved.
+ * Copyright 1998-2002 The OpenLDAP Foundation, All Rights Reserved.
* COPYING RESTRICTIONS APPLY, see COPYRIGHT file
*/
#include <ac/socket.h>
#include <ac/string.h>
#include <ac/time.h>
+#include <ac/unistd.h>
#include <sys/stat.h>
#include "slap.h"
DBCache *
ldbm_cache_open(
Backend *be,
- char *name,
- char *suffix,
+ const char *name,
+ const char *suffix,
int flags
)
{
struct ldbminfo *li = (struct ldbminfo *) be->be_private;
- int i, lru;
- time_t oldtime, curtime;
+ int i, lru, empty;
+ time_t oldtime;
char buf[MAXPATHLEN];
#ifdef HAVE_ST_BLKSIZE
struct stat st;
#endif
- sprintf( buf, "%s" LDAP_DIRSEP "%s%s",
- li->li_directory, name, suffix );
+ if (li->li_envdirok)
+ sprintf( buf, "%s%s", name, suffix );
+ else
+ sprintf( buf, "%s" LDAP_DIRSEP "%s%s",
+ li->li_directory, name, suffix );
if( li->li_dblocking ) {
flags |= LDBM_LOCKING;
flags |= LDBM_NOSYNC;
}
+#ifdef NEW_LOGGING
+ LDAP_LOG( CACHE, ENTRY,
+ "ldbm_cache_open: \"%s\", %d, %o\n", buf, flags, li->li_mode );
+#else
Debug( LDAP_DEBUG_TRACE, "=> ldbm_cache_open( \"%s\", %d, %o )\n", buf,
flags, li->li_mode );
+#endif
+
- lru = 0;
- curtime = slap_get_time();
- oldtime = curtime;
+ empty = MAXDBCACHE;
ldap_pvt_thread_mutex_lock( &li->li_dbcache_mutex );
- for ( i = 0; i < MAXDBCACHE && li->li_dbcache[i].dbc_name != NULL;
- i++ ) {
- /* already open - return it */
- if ( strcmp( li->li_dbcache[i].dbc_name, buf ) == 0 ) {
- li->li_dbcache[i].dbc_refcnt++;
- Debug( LDAP_DEBUG_TRACE,
- "<= ldbm_cache_open (cache %d)\n", i, 0, 0 );
- ldap_pvt_thread_mutex_unlock( &li->li_dbcache_mutex );
- return( &li->li_dbcache[i] );
- }
+ do {
+ lru = 0;
+ oldtime = 1;
+ for ( i = 0; i < MAXDBCACHE; i++ ) {
+ /* see if this slot is free */
+ if ( li->li_dbcache[i].dbc_name == NULL) {
+ if (empty == MAXDBCACHE)
+ empty = i;
+ continue;
+ }
- /* keep track of lru db */
- if ( li->li_dbcache[i].dbc_lastref < oldtime &&
- li->li_dbcache[i].dbc_refcnt == 0 ) {
- lru = i;
- oldtime = li->li_dbcache[i].dbc_lastref;
+ if ( strcmp( li->li_dbcache[i].dbc_name, buf ) == 0 ) {
+ /* already open - return it */
+ if (li->li_dbcache[i].dbc_flags != flags
+ && li->li_dbcache[i].dbc_refcnt == 0)
+ {
+ /* we don't want to use an open cache with different
+ * permissions (esp. if we need write but the open
+ * cache is read-only). So close this one if
+ * possible, and re-open below.
+ *
+ * FIXME: what about the case where the refcount
+ * is > 0? right now, we're using it anyway and
+ * just praying. Can there be more than one open
+ * cache to the same db?
+ *
+ * Also, it's really only necessary to compare the
+ * read-only flag, instead of all of the flags,
+ * but for now I'm checking all of them.
+ */
+ lru = i;
+ empty = MAXDBCACHE;
+ break;
+ }
+ li->li_dbcache[i].dbc_refcnt++;
+#ifdef NEW_LOGGING
+ LDAP_LOG( CACHE, DETAIL1,
+ "ldbm_cache_open: cache %d\n", i, 0, 0 );
+#else
+ Debug( LDAP_DEBUG_TRACE,
+ "<= ldbm_cache_open (cache %d)\n", i, 0, 0 );
+#endif
+
+ ldap_pvt_thread_mutex_unlock( &li->li_dbcache_mutex );
+ return( &li->li_dbcache[i] );
+ }
+
+ /* keep track of lru db */
+ if (( li->li_dbcache[i].dbc_refcnt == 0 ) &&
+ (( oldtime == 1 ) ||
+ ( li->li_dbcache[i].dbc_lastref < oldtime )) )
+ {
+ lru = i;
+ oldtime = li->li_dbcache[i].dbc_lastref;
+ }
}
- }
- /* no empty slots, not already open - close lru and use that slot */
- if ( i == MAXDBCACHE ) {
- i = lru;
- if ( li->li_dbcache[i].dbc_refcnt != 0 ) {
- Debug( LDAP_DEBUG_ANY,
- "ldbm_cache_open no unused db to close - waiting\n",
- 0, 0, 0 );
- lru = -1;
- while ( lru == -1 ) {
+ i = empty;
+ if ( i == MAXDBCACHE ) {
+ /* no empty slots, not already open - close lru and use that slot */
+ if ( li->li_dbcache[lru].dbc_refcnt == 0 ) {
+ i = lru;
+ ldbm_close( li->li_dbcache[i].dbc_db );
+ free( li->li_dbcache[i].dbc_name );
+ li->li_dbcache[i].dbc_name = NULL;
+ } else {
+#ifdef NEW_LOGGING
+ LDAP_LOG( CACHE, INFO,
+ "ldbm_cache_open: no unused db to close - waiting\n",
+ 0, 0, 0 );
+#else
+ Debug( LDAP_DEBUG_ANY,
+ "ldbm_cache_open no unused db to close - waiting\n",
+ 0, 0, 0 );
+#endif
+
ldap_pvt_thread_cond_wait( &li->li_dbcache_cv,
- &li->li_dbcache_mutex );
- for ( i = 0; i < MAXDBCACHE; i++ ) {
- if ( li->li_dbcache[i].dbc_refcnt
- == 0 ) {
- lru = i;
- break;
- }
- }
+ &li->li_dbcache_mutex );
+ /* after waiting for a free slot, go back to square
+ * one: look for an open cache for this db, or an
+ * empty slot, or an unref'ed cache, or wait again.
+ */
}
- i = lru;
}
- ldbm_close( li->li_dbcache[i].dbc_db );
- free( li->li_dbcache[i].dbc_name );
- li->li_dbcache[i].dbc_name = NULL;
- }
+ } while (i == MAXDBCACHE);
- if ( (li->li_dbcache[i].dbc_db = ldbm_open( buf, flags, li->li_mode,
- li->li_dbcachesize )) == NULL ) {
+ if ( (li->li_dbcache[i].dbc_db = ldbm_open( li->li_dbenv, buf, flags, li->li_mode,
+ li->li_dbcachesize )) == NULL )
+ {
int err = errno;
+#ifdef NEW_LOGGING
+ LDAP_LOG( CACHE, ERR,
+ "ldbm_cache_open: \"%s\" failed, errono=%d, reason=%s\n",
+ buf, err, err > -1 && err < sys_nerr ? sys_errlist[err] :
+ "unknown" );
+#else
Debug( LDAP_DEBUG_TRACE,
"<= ldbm_cache_open NULL \"%s\" errno=%d reason=\"%s\")\n",
buf, err, err > -1 && err < sys_nerr ?
sys_errlist[err] : "unknown" );
+#endif
+
ldap_pvt_thread_mutex_unlock( &li->li_dbcache_mutex );
return( NULL );
}
li->li_dbcache[i].dbc_name = ch_strdup( buf );
li->li_dbcache[i].dbc_refcnt = 1;
- li->li_dbcache[i].dbc_lastref = curtime;
+ li->li_dbcache[i].dbc_lastref = slap_get_time();
+ li->li_dbcache[i].dbc_flags = flags;
+ li->li_dbcache[i].dbc_dirty = 0;
#ifdef HAVE_ST_BLKSIZE
if ( stat( buf, &st ) == 0 ) {
li->li_dbcache[i].dbc_blksize = st.st_blksize;
}
li->li_dbcache[i].dbc_maxids = (li->li_dbcache[i].dbc_blksize /
sizeof(ID)) - ID_BLOCK_IDS_OFFSET;
- li->li_dbcache[i].dbc_maxindirect = (SLAPD_LDBM_MIN_MAXIDS /
- li->li_dbcache[i].dbc_maxids) + 1;
+ li->li_dbcache[i].dbc_maxindirect = ( SLAPD_LDBM_MIN_MAXIDS /
+ li->li_dbcache[i].dbc_maxids ) + 1;
+
+ assert( li->li_dbcache[i].dbc_maxindirect < 256 );
+#ifdef NEW_LOGGING
+ LDAP_LOG( CACHE, ARGS,
+ "ldbm_cache_open: blksize:%ld maxids:%d maxindirect:%d\n",
+ li->li_dbcache[i].dbc_blksize, li->li_dbcache[i].dbc_maxids,
+ li->li_dbcache[i].dbc_maxindirect );
+#else
Debug( LDAP_DEBUG_ARGS,
"ldbm_cache_open (blksize %ld) (maxids %d) (maxindirect %d)\n",
li->li_dbcache[i].dbc_blksize, li->li_dbcache[i].dbc_maxids,
li->li_dbcache[i].dbc_maxindirect );
+#endif
+
+#ifdef NEW_LOGGING
+ LDAP_LOG( CACHE, DETAIL1, "<= ldbm_cache_open: (opened %d)\n", i, 0, 0 );
+#else
Debug( LDAP_DEBUG_TRACE, "<= ldbm_cache_open (opened %d)\n", i, 0, 0 );
+#endif
+
+ ldap_pvt_thread_mutex_init( &li->li_dbcache[i].dbc_write_mutex );
+
ldap_pvt_thread_mutex_unlock( &li->li_dbcache_mutex );
return( &li->li_dbcache[i] );
}
{
struct ldbminfo *li = (struct ldbminfo *) be->be_private;
- if( li->li_dbwritesync ) {
+ if( li->li_dbwritesync && db->dbc_dirty ) {
ldbm_sync( db->dbc_db );
+ db->dbc_dirty = 0;
}
ldap_pvt_thread_mutex_lock( &li->li_dbcache_mutex );
- if ( --db->dbc_refcnt == 0 ) {
+ if ( --db->dbc_refcnt <= 0 ) {
+ db->dbc_refcnt = 0;
ldap_pvt_thread_cond_signal( &li->li_dbcache_cv );
}
ldap_pvt_thread_mutex_unlock( &li->li_dbcache_mutex );
struct ldbminfo *li = (struct ldbminfo *) be->be_private;
ldap_pvt_thread_mutex_lock( &li->li_dbcache_mutex );
- if ( --db->dbc_refcnt == 0 ) {
+ if ( --db->dbc_refcnt <= 0 ) {
+ db->dbc_refcnt = 0;
ldap_pvt_thread_cond_signal( &li->li_dbcache_cv );
ldbm_close( db->dbc_db );
free( db->dbc_name );
db->dbc_name = NULL;
+ ldap_pvt_thread_mutex_destroy( &db->dbc_write_mutex );
}
ldap_pvt_thread_mutex_unlock( &li->li_dbcache_mutex );
}
ldap_pvt_thread_mutex_lock( &li->li_dbcache_mutex );
for ( i = 0; i < MAXDBCACHE; i++ ) {
if ( li->li_dbcache[i].dbc_name != NULL ) {
+#ifdef NEW_LOGGING
+ LDAP_LOG( CACHE, DETAIL1,
+ "ldbm_cache_flush_all: flushing db (%s)\n",
+ li->li_dbcache[i].dbc_name, 0, 0 );
+#else
Debug( LDAP_DEBUG_TRACE, "ldbm flushing db (%s)\n",
li->li_dbcache[i].dbc_name, 0, 0 );
+#endif
+
ldbm_sync( li->li_dbcache[i].dbc_db );
+ li->li_dbcache[i].dbc_dirty = 0;
if ( li->li_dbcache[i].dbc_refcnt != 0 ) {
+#ifdef NEW_LOGGING
+ LDAP_LOG( CACHE, INFO,
+ "ldbm_cache_flush_all: couldn't close db (%s), refcnt=%d\n",
+ li->li_dbcache[i].dbc_name, li->li_dbcache[i].dbc_refcnt,0);
+#else
Debug( LDAP_DEBUG_TRACE,
"refcnt = %d, couldn't close db (%s)\n",
li->li_dbcache[i].dbc_refcnt,
li->li_dbcache[i].dbc_name, 0 );
+#endif
+
} else {
+#ifdef NEW_LOGGING
+ LDAP_LOG( CACHE, DETAIL1,
+ "ldbm_cache_flush_all: ldbm closing db (%s)\n",
+ li->li_dbcache[i].dbc_name, 0, 0 );
+#else
Debug( LDAP_DEBUG_TRACE,
"ldbm closing db (%s)\n",
li->li_dbcache[i].dbc_name, 0, 0 );
+#endif
+
ldap_pvt_thread_cond_signal( &li->li_dbcache_cv );
ldbm_close( li->li_dbcache[i].dbc_db );
free( li->li_dbcache[i].dbc_name );
ldap_pvt_thread_mutex_unlock( &li->li_dbcache_mutex );
}
+void
+ldbm_cache_sync( Backend *be )
+{
+ struct ldbminfo *li = (struct ldbminfo *) be->be_private;
+ int i;
+
+ ldap_pvt_thread_mutex_lock( &li->li_dbcache_mutex );
+ for ( i = 0; i < MAXDBCACHE; i++ ) {
+ if ( li->li_dbcache[i].dbc_name != NULL && li->li_dbcache[i].dbc_dirty ) {
+#ifdef NEW_LOGGING
+ LDAP_LOG ( CACHE, DETAIL1, "ldbm_cache_sync: "
+ "ldbm syncing db (%s)\n", li->li_dbcache[i].dbc_name, 0, 0 );
+#else
+ Debug( LDAP_DEBUG_TRACE, "ldbm syncing db (%s)\n",
+ li->li_dbcache[i].dbc_name, 0, 0 );
+#endif
+ ldbm_sync( li->li_dbcache[i].dbc_db );
+ li->li_dbcache[i].dbc_dirty = 0;
+ }
+ }
+ ldap_pvt_thread_mutex_unlock( &li->li_dbcache_mutex );
+}
+
Datum
ldbm_cache_fetch(
DBCache *db,
Datum key
)
{
- Datum data;
-
return ldbm_fetch( db->dbc_db, key );
-
- return( data );
}
int
flags, 0, 0, 0, 0 );
#endif /* LDBM_DEBUG */
+ db->dbc_dirty = 1;
rc = ldbm_store( db->dbc_db, key, data, flags );
return( rc );
{
int rc;
+ db->dbc_dirty = 1;
rc = ldbm_delete( db->dbc_db, key );
return( rc );
}
+
+void *
+ldbm_cache_sync_daemon(
+ void *be_ptr
+)
+{
+ Backend *be = (Backend *)be_ptr;
+ struct ldbminfo *li = (struct ldbminfo *) be->be_private;
+
+#ifdef NEW_LOGGING
+ LDAP_LOG ( CACHE, ARGS, "ldbm_cache_sync_daemon:"
+ " synchronizer starting for %s\n", li->li_directory, 0, 0 );
+#else
+ Debug( LDAP_DEBUG_ANY, "synchronizer starting for %s\n", li->li_directory, 0, 0 );
+#endif
+
+ while (!li->li_dbshutdown) {
+ int i = li->li_dbsyncwaitn;
+
+ sleep( li->li_dbsyncfreq );
+
+ while (i && ldap_pvt_thread_pool_backload(&connection_pool) != 0) {
+#ifdef NEW_LOGGING
+ LDAP_LOG ( CACHE, DETAIL1, "ldbm_cache_sync_daemon:"
+ " delay syncing %s\n", li->li_directory, 0, 0 );
+#else
+ Debug( LDAP_DEBUG_TRACE, "delay syncing %s\n", li->li_directory, 0, 0 );
+#endif
+ sleep(li->li_dbsyncwaitinterval);
+ i--;
+ }
+
+ if (!li->li_dbshutdown) {
+#ifdef NEW_LOGGING
+ LDAP_LOG ( CACHE, DETAIL1, "ldbm_cache_sync_daemon:"
+ " syncing %s\n", li->li_directory, 0, 0 );
+#else
+ Debug( LDAP_DEBUG_TRACE, "syncing %s\n", li->li_directory, 0, 0 );
+#endif
+ ldbm_cache_sync( be );
+ }
+ }
+
+#ifdef NEW_LOGGING
+ LDAP_LOG ( CACHE, DETAIL1, "ldbm_cache_sync_daemon:"
+ " synchronizer stopping\n", 0, 0, 0);
+#else
+ Debug( LDAP_DEBUG_ANY, "synchronizer stopping\n", 0, 0, 0 );
+#endif
+
+ return NULL;
+}
projects / openldap / blobdiff