#include <ac/string.h>
#include <ac/unistd.h>
#include <ac/stdlib.h>
-
+#include <ac/errno.h>
+#include <sys/stat.h>
#include "back-bdb.h"
#include <lutil.h>
#include <ldap_rq.h>
return NULL;
}
+/*
+ * Unconditionally perform a database recovery. Only works on
+ * databases that were previously opened with transactions and
+ * logs enabled.
+ */
+static int
+bdb_do_recovery( BackendDB *be )
+{
+ struct bdb_info *bdb = (struct bdb_info *) be->be_private;
+ DB_ENV *re_dbenv;
+ u_int32_t flags;
+ int rc;
+ char path[MAXPATHLEN], *ptr;
+
+ /* Create and init the recovery environment */
+ rc = db_env_create( &re_dbenv, 0 );
+ if( rc != 0 ) {
+ Debug( LDAP_DEBUG_ANY,
+ "bdb_do_recovery: db_env_create failed: %s (%d)\n",
+ db_strerror(rc), rc, 0 );
+ return rc;
+ }
+ re_dbenv->set_errpfx( re_dbenv, be->be_suffix[0].bv_val );
+ re_dbenv->set_errcall( re_dbenv, bdb_errcall );
+ (void)re_dbenv->set_verbose(re_dbenv, DB_VERB_RECOVERY, 1);
+ (void)re_dbenv->set_verbose(re_dbenv, DB_VERB_CHKPOINT, 1);
+
+ flags = DB_CREATE | DB_INIT_LOCK | DB_INIT_LOG | DB_INIT_MPOOL |
+ DB_INIT_TXN | DB_USE_ENVIRON | DB_RECOVER;
+
+ /* Open the environment, which will also perform the recovery */
+#ifdef HAVE_EBCDIC
+ strcpy( path, bdb->bi_dbenv_home );
+ __atoe( path );
+ rc = re_dbenv->open( re_dbenv,
+ path,
+ flags,
+ bdb->bi_dbenv_mode );
+#else
+ rc = re_dbenv->open( re_dbenv,
+ bdb->bi_dbenv_home,
+ flags,
+ bdb->bi_dbenv_mode );
+#endif
+ if( rc != 0 ) {
+ Debug( LDAP_DEBUG_ANY,
+ "bdb_do_recovery: dbenv_open failed: %s (%d)\n",
+ db_strerror(rc), rc, 0 );
+ return rc;
+ }
+ (void) re_dbenv->close( re_dbenv, 0 );
+
+ /* By convention we reset the mtime for id2entry.bdb to the current time */
+ ptr = lutil_strcopy( path, bdb->bi_dbenv_home);
+ *ptr++ = LDAP_DIRSEP[0];
+ strcpy( ptr, bdbi_databases[0].file);
+ (void) utime( path, NULL);
+
+ return 0;
+}
+
+/*
+ * Database recovery logic:
+ * This function is called whenever the database appears to have been
+ * shut down uncleanly, as determined by the alock functions.
+ * Because of the -q function in slapadd, there is also the possibility
+ * that the shutdown happened when transactions weren't being used and
+ * the database is likely to be corrupt. The function checks for this
+ * condition by examining the environment to make sure it had previously
+ * been opened with transactions enabled. If this is the case, the
+ * database is recovered as usual. If transactions were not enabled,
+ * then this function will return a fail.
+ */
+static int
+bdb_db_recover( BackendDB *be )
+{
+ struct bdb_info *bdb = (struct bdb_info *) be->be_private;
+ DB_ENV *re_dbenv;
+ u_int32_t flags;
+ int rc;
+#ifdef HAVE_EBCDIC
+ char path[MAXPATHLEN];
+#endif
+
+ /* Create the recovery environment, then open it.
+ * We use the DB_JOIN in combination with a flags value of
+ * zero so we join an existing environment and can read the
+ * value of the flags that were used the last time the
+ * environment was opened. DB_CREATE is added because the
+ * open would fail if the only thing that had been done
+ * was an open with transactions and logs disabled.
+ */
+ rc = db_env_create( &re_dbenv, 0 );
+ if( rc != 0 ) {
+ Debug( LDAP_DEBUG_ANY,
+ "bdb_db_recover: db_env_create failed: %s (%d)\n",
+ db_strerror(rc), rc, 0 );
+ return rc;
+ }
+ re_dbenv->set_errpfx( re_dbenv, be->be_suffix[0].bv_val );
+ re_dbenv->set_errcall( re_dbenv, bdb_errcall );
+
+ Debug( LDAP_DEBUG_TRACE,
+ "bdb_db_recover: dbenv_open(%s)\n",
+ bdb->bi_dbenv_home, 0, 0);
+
+#ifdef HAVE_EBCDIC
+ strcpy( path, bdb->bi_dbenv_home );
+ __atoe( path );
+ rc = re_dbenv->open( re_dbenv,
+ path,
+ DB_JOINENV,
+ bdb->bi_dbenv_mode );
+#else
+ rc = re_dbenv->open( re_dbenv,
+ bdb->bi_dbenv_home,
+ DB_JOINENV,
+ bdb->bi_dbenv_mode );
+#endif
+
+ if( rc == ENOENT ) {
+ goto re_exit;
+ }
+ else if( rc != 0 ) {
+ Debug( LDAP_DEBUG_ANY,
+ "bdb_db_recover: dbenv_open failed: %s (%d)\n",
+ db_strerror(rc), rc, 0 );
+ return rc;
+ }
+
+ /*
+ * Check the flags that had been used in the previous open.
+ * The environment needed to have had both
+ * DB_INIT_LOG and DB_INIT_TXN set for us to be willing to
+ * recover the database. Otherwise the an app failed while running
+ * without transactions and logs enabled and the dn2id and id2entry
+ * mapping is likely to be corrupt.
+ */
+ rc = re_dbenv->get_open_flags( re_dbenv, &flags );
+ if( rc != 0 ) {
+ Debug( LDAP_DEBUG_ANY,
+ "bdb_db_recover: get_open_flags failed: %s (%d)\n",
+ db_strerror(rc), rc, 0 );
+ return rc;
+ }
+
+ (void) re_dbenv->close( re_dbenv, 0 );
+
+ if( (flags & DB_INIT_LOG) && (flags & DB_INIT_TXN) ) {
+ return bdb_do_recovery( be );
+ }
+
+re_exit:
+ Debug( LDAP_DEBUG_ANY,
+ "bdb_db_recover: Database cannot be recovered. "\
+ "Restore from backup!\n", 0, 0, 0);
+ return -1;
+
+}
+
+
static int
bdb_db_open( BackendDB *be )
{
int rc, i;
struct bdb_info *bdb = (struct bdb_info *) be->be_private;
+ struct stat stat1, stat2;
u_int32_t flags;
-#ifdef HAVE_EBCDIC
char path[MAXPATHLEN];
-#endif
+ char *ptr;
Debug( LDAP_DEBUG_ARGS,
"bdb_db_open: %s\n",
return -1;
}
#endif
- /* we should check existance of dbenv_home and db_directory */
- rc = db_env_create( &bdb->bi_dbenv, 0 );
- if( rc != 0 ) {
+ /* Check existence of dbenv_home. Any error means trouble */
+ rc = stat( bdb->bi_dbenv_home, &stat1 );
+ if( rc !=0 ) {
Debug( LDAP_DEBUG_ANY,
- "bdb_db_open: db_env_create failed: %s (%d)\n",
- db_strerror(rc), rc, 0 );
- return rc;
+ "bdb_db_open: Cannot access database directory %s (%d)\n",
+ bdb->bi_dbenv_home, errno, 0 );
+ return -1;
}
-
- flags = DB_INIT_MPOOL | DB_THREAD | DB_CREATE;
-
- if ( !( slapMode & SLAP_TOOL_QUICK ))
- flags |= DB_INIT_LOCK | DB_INIT_LOG | DB_INIT_TXN;
- rc = alock_open( &bdb->bi_alock_info, "slapd", bdb->bi_dbenv_home,
- slapMode & SLAP_TOOL_READONLY ? ALOCK_LOCKED : ALOCK_UNIQUE );
+ /* Perform database use arbitration/recovery logic */
+ rc = alock_open( &bdb->bi_alock_info,
+ "slapd",
+ bdb->bi_dbenv_home,
+ slapMode & SLAP_TOOL_READONLY ?
+ ALOCK_LOCKED : ALOCK_UNIQUE );
+
if( rc == ALOCK_RECOVER ) {
Debug( LDAP_DEBUG_ANY,
- "bdb_db_open: alock_open: recovery required\n", 0, 0, 0 );
- flags |= DB_RECOVER;
+ "bdb_db_open: unclean shutdown detected;"
+ " attempting recovery.\n",
+ 0, 0, 0 );
+ if( bdb_db_recover( be ) != 0 ) {
+ Debug( LDAP_DEBUG_ANY,
+ "bdb_db_open: DB recovery failed.\n",
+ 0, 0, 0 );
+ return -1;
+ }
+ if( alock_recover (&bdb->bi_alock_info) != 0 ) {
+ Debug( LDAP_DEBUG_ANY,
+ "bdb_db_open: alock_recover failed\n",
+ 0, 0, 0 );
+ return -1;
+ }
+
} else if( rc == ALOCK_BUSY ) {
Debug( LDAP_DEBUG_ANY,
- "bdb_db_open: alock_open: database in use\n", 0, 0, 0 );
+ "bdb_db_open: database already in use\n",
+ 0, 0, 0 );
return -1;
} else if( rc != ALOCK_CLEAN ) {
Debug( LDAP_DEBUG_ANY,
- "bdb_db_open: alock_open: database unstable\n", 0, 0, 0 );
+ "bdb_db_open: alock package is unstable\n",
+ 0, 0, 0 );
return -1;
}
+
+ /*
+ * The DB_CONFIG file may have changed. If so, recover the
+ * database so that new settings are put into effect. Also
+ * note the possible absence of DB_CONFIG in the log.
+ */
+ if( stat( bdb->bi_db_config_path, &stat1 ) == 0 ) {
+ ptr = lutil_strcopy(path, bdb->bi_dbenv_home);
+ *ptr++ = LDAP_DIRSEP[0];
+ strcpy( ptr, bdbi_databases[0].file);
+ if( stat( path, &stat2 ) == 0 ) {
+ if( stat2.st_mtime <= stat1.st_mtime ) {
+ Debug( LDAP_DEBUG_ANY,
+ "bdb_db_open: DB_CONFIG for suffix %s has changed.\n"
+ "Performing database recovery to activate new settings.\n",
+ be->be_suffix[0].bv_val, 0, 0 );
+ if( bdb_do_recovery( be ) != 0) {
+ Debug( LDAP_DEBUG_ANY,
+ "bdb_db_open: db recovery failed.\n",
+ 0, 0, 0 );
+ return -1;
+ }
+ }
+
+ }
+ }
+ else {
+ Debug( LDAP_DEBUG_ANY,
+ "bdb_db_open: Warning - No DB_CONFIG file found "
+ "in directory %s: (%d)\n"
+ "Expect poor performance for suffix %s.\n",
+ bdb->bi_dbenv_home, errno, be->be_suffix[0].bv_val );
+ }
+
+ flags = DB_INIT_MPOOL | DB_THREAD | DB_CREATE;
+ if ( !( slapMode & SLAP_TOOL_QUICK ))
+ flags |= DB_INIT_LOCK | DB_INIT_LOG | DB_INIT_TXN;
+
+ rc = db_env_create( &bdb->bi_dbenv, 0 );
+ if( rc != 0 ) {
+ Debug( LDAP_DEBUG_ANY,
+ "bdb_db_open: db_env_create failed: %s (%d)\n",
+ db_strerror(rc), rc, 0 );
+ return rc;
+ }
/* If a key was set, use shared memory for the BDB environment */
if ( bdb->bi_shm_key ) {
db_strerror(rc), rc, 0 );
return rc;
}
- if( flags & DB_RECOVER ) {
- rc = alock_recover (&bdb->bi_alock_info);
- if( rc != 0 ) {
- Debug( LDAP_DEBUG_ANY,
- "bdb_db_open: unable to alock_recover\n", 0, 0, 0 );
- return -1;
- }
- }
flags = DB_THREAD | bdb->bi_db_opflags;
ldap_pvt_thread_rdwr_wunlock ( &bdb->bi_idl_tree_rwlock );
}
- if ( !( slapMode & SLAP_TOOL_QUICK )) {
+ if ( !( slapMode & SLAP_TOOL_QUICK ) && bdb->bi_dbenv ) {
XLOCK_ID_FREE(bdb->bi_dbenv, bdb->bi_cache.c_locker);
}
projects / openldap / commitdiff