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39f0066db4
correctness of locking schemas in backends. In back-bdb2 open NEXTID during startup and close at shutdown.
390 lines
9.6 KiB
C
390 lines
9.6 KiB
C
/* txn.c - TP support functions of the bdb2 backend */
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#include "txn.h"
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int
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bdb2i_txn_head_init( BDB2_TXN_HEAD *head )
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{
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int dbFile;
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BDB2_TXN_FILES **fileNodeH;
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/* for each fixed DB file allocate a file descriptor node and
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initialize the file's name */
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fileNodeH = &head->dbFiles;
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for ( dbFile = BDB2_DB_DN_FILE; dbFile <= BDB2_DB_OC_IDX_FILE; dbFile++ ) {
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char fileName[MAXPATHLEN];
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*fileNodeH = (BDB2_TXN_FILES *) ch_calloc( 1, sizeof( BDB2_TXN_FILES ));
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if ( *fileNodeH == NULL ) {
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Debug( LDAP_DEBUG_ANY, "bdb2i_txn_head_init(): out of memory!\n",
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0, 0, 0 );
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return( 1 );
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}
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sprintf( fileName, "%s%s", bdb2i_fixed_filenames[dbFile], BDB2_SUFFIX );
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(*fileNodeH)->dbc_name = strdup( fileName );
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fileNodeH = &(*fileNodeH)->next;
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}
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return 0;
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}
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static void
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bdb2i_init_db_file_cache( struct ldbminfo *li, BDB2_TXN_FILES *fileinfo )
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{
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struct stat st;
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char buf[MAXPATHLEN];
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fileinfo->dbc_refcnt = 1;
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sprintf( buf, "%s%s%s", li->li_directory, DEFAULT_DIRSEP,
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fileinfo->dbc_name );
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if ( stat( buf, &st ) == 0 ) {
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fileinfo->dbc_blksize = st.st_blksize;
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} else {
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fileinfo->dbc_blksize = DEFAULT_BLOCKSIZE;
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}
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fileinfo->dbc_maxids = ( fileinfo->dbc_blksize / sizeof( ID )) -
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ID_BLOCK_IDS_OFFSET;
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fileinfo->dbc_maxindirect = ( SLAPD_LDBM_MIN_MAXIDS /
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fileinfo->dbc_maxids ) + 1;
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}
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/* create a DB file cache entry for a specified index attribute
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(if not already done); the function is called during config
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file read for all index'ed attributes; if "default" index with
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a non-none selection is given, this is remembered for run-time
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extension of the list of index files; the function is also
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called before add or modify operations to check for putative
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new "default" index files; at that time, files are also opened
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*/
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void
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bdb2i_txn_attr_config(
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struct ldbminfo *li,
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char *attr,
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int open )
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{
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BDB2_TXN_HEAD *head = &li->li_txn_head;
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/* the "attribute" 'default' is special */
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if ( strcasecmp( attr, "default" )) {
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/* create a new index file node, if the index is not known already */
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BDB2_TXN_FILES **fileNodeH;
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char fileName[MAXPATHLEN];
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sprintf( fileName, "%s%s", attr, BDB2_SUFFIX );
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/* search for the end of the list or a node describing
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the current attribute */
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for ( fileNodeH = &head->dbFiles;
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( *fileNodeH && strcasecmp( (*fileNodeH)->dbc_name, fileName ));
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fileNodeH = &(*fileNodeH)->next ) {
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}
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/* unless we have that attribute already... */
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if ( *fileNodeH == NULL ) {
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BDB2_TXN_FILES *p;
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Debug( LDAP_DEBUG_TRACE,
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"bdb2i_txn_attr_config(): adding node for \"%s\"\n",
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fileName, 0, 0 );
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/* if we're out of memory, we have to see, how to exit... */
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if ( ( *fileNodeH = p = (BDB2_TXN_FILES *)
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ch_calloc( 1, sizeof( BDB2_TXN_FILES )) ) == NULL ) {
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Debug( LDAP_DEBUG_ANY,
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"bdb2i_txn_attr_config(): out of memory -- FATAL.\n",
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0, 0, 0 );
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/* during configuration (no files are opened)
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we can just exit, otherwise we kill ourself and
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hope to shutdown cleanly... */
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if ( open ) {
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pthread_kill( pthread_self(), LDAP_SIGUSR1 );
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} else {
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exit( 1 );
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}
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}
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p->dbc_name = strdup( fileName );
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/* if requested for, we have to open the DB file */
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/* BUT NOT "objectclass", 'cause that's a default index ! */
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if ( open && strcasecmp( fileName, "objectclass" )) {
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/* re-use filename to get the complete path */
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sprintf( fileName, "%s%s%s",
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li->li_directory, DEFAULT_DIRSEP, p->dbc_name );
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/* since we have an mpool, we should not define a cache size */
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p->dbc_db = ldbm_open( fileName, LDBM_WRCREAT, li->li_mode, 0 );
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/* if the files could not be opened, something is wrong;
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complain */
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if ( p->dbc_db == NULL ) {
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Debug( LDAP_DEBUG_ANY,
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"bdb2i_txn_open_files(): couldn't open file \"%s\" -- FATAL.\n",
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p->dbc_name, 0, 0 );
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pthread_kill( pthread_self(), LDAP_SIGUSR1 );
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}
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bdb2i_init_db_file_cache( li, p );
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Debug( LDAP_DEBUG_TRACE,
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"bdb2i_txn_attr_config(): NEW INDEX FILE \"%s\"\n",
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p->dbc_name, 0, 0 );
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}
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}
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} else { /* it is "attribute" 'default' */
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head->withDefIDX = BDB2_WITH_DEF_IDX;
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}
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}
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/* open the NEXTID file for read/write; if it does not exist,
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create it (access to the file must be preceeded by a rewind)
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*/
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static int
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bdb2i_open_nextid( struct ldbminfo *li )
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{
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BDB2_TXN_HEAD *head = &li->li_txn_head;
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FILE *fp = NULL;
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char *file = li->li_nextid_file;
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/* try to open the file for read and write */
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if ((( fp = fopen( file, "r+" )) == NULL ) &&
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(( fp = fopen( file, "w+" )) == NULL )) {
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Debug( LDAP_DEBUG_ANY,
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"bdb2i_open_nextid: could not open \"%s\"\n",
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file, 0, 0 );
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return( -1 );
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}
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/* the file is open for read/write */
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head->nextidFP = fp;
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return( 0 );
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}
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/* open all DB during startup of the backend (necessary due to TP)
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additional files may be opened during slapd life-time due to
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default indexes (must be configured in slapd.conf;
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see bdb2i_txn_attr_config)
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*/
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int
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bdb2i_txn_open_files( struct ldbminfo *li )
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{
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BDB2_TXN_HEAD *head = &li->li_txn_head;
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BDB2_TXN_FILES *dbFile;
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int rc;
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for ( dbFile = head->dbFiles; dbFile; dbFile = dbFile->next ) {
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char fileName[MAXPATHLEN];
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sprintf( fileName, "%s%s%s",
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li->li_directory, DEFAULT_DIRSEP, dbFile->dbc_name );
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/* since we have an mpool, we should not define a cache size */
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dbFile->dbc_db = ldbm_open( fileName, LDBM_WRCREAT, li->li_mode, 0 );
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/* if the files could not be opened, something is wrong; complain */
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if ( dbFile->dbc_db == NULL ) {
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Debug( LDAP_DEBUG_ANY,
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"bdb2i_txn_open_files(): couldn't open file \"%s\" -- FATAL.\n",
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dbFile->dbc_name, 0, 0 );
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return( -1 );
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}
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/* initialize the file info */
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bdb2i_init_db_file_cache( li, dbFile );
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Debug( LDAP_DEBUG_TRACE, "bdb2i_txn_open_files(): OPEN INDEX \"%s\"\n",
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dbFile->dbc_name, 0, 0 );
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}
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rc = bdb2i_open_nextid( li );
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return rc;
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}
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/* close the NEXTID file */
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static void
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bdb2i_close_nextid( BDB2_TXN_HEAD *head )
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{
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fclose( head->nextidFP );
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head->nextidFP = NULL;
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}
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/* close all DB files during shutdown of the backend */
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void
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bdb2i_txn_close_files( BackendDB *be )
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{
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struct ldbminfo *li = (struct ldbminfo *) be->be_private;
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BDB2_TXN_HEAD *head = &li->li_txn_head;
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BDB2_TXN_FILES *dbFile;
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for ( dbFile = head->dbFiles; dbFile; dbFile = dbFile->next ) {
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ldbm_close( dbFile->dbc_db );
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}
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bdb2i_close_nextid( head );
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}
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/* get the db_cache structure associated with a specified
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DB file (replaces the on-the-fly opening of files in cache_open()
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*/
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BDB2_TXN_FILES *
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bdb2i_get_db_file_cache( struct ldbminfo *li, char *name )
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{
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BDB2_TXN_HEAD *head = &li->li_txn_head;
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BDB2_TXN_FILES *dbFile;
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int dbFileNum;
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Debug( LDAP_DEBUG_TRACE, "bdb2i_get_db_file_cache(): looking for file %s\n",
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name, 0, 0 );
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for ( dbFile = head->dbFiles; dbFile; dbFile = dbFile->next ) {
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/* we've got it */
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if ( !strcasecmp( dbFile->dbc_name, name )) return( dbFile );
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}
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Debug( LDAP_DEBUG_ANY,
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"bdb2i_get_db_file_cache(): UPS, could't find \"%s\" \n", name, 0, 0 );
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/* ups, we couldn't find the file */
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return( NULL );
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}
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/* check for new attribute indexes, that might have been created
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during former runs of slapd */
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/* this is called during startup of the slapd server */
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int
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bdb2i_check_additional_attr_index( struct ldbminfo *li )
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{
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DIR *datadir;
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struct dirent *file;
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if ( ( datadir = opendir( li->li_directory ) ) == NULL ) {
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Debug( LDAP_DEBUG_ANY,
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"bdb2i_check_additional_attr_index(): ERROR while opening datadir: %s\n",
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strerror( errno ), 0, 0 );
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return( 1 );
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}
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for ( file = readdir( datadir ); file; file = readdir( datadir )) {
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char filename[MAXPATHLEN];
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int namelen;
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strcpy( filename, file->d_name );
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namelen = strlen( filename );
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if ( namelen > strlen( BDB2_SUFFIX )) {
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if ( !strcasecmp( filename + namelen - strlen( BDB2_SUFFIX ),
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BDB2_SUFFIX )) {
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*(filename + namelen - strlen( BDB2_SUFFIX )) = '\0';
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bdb2i_txn_attr_config( li, filename, 0 );
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Debug( LDAP_DEBUG_TRACE, "INDEX FILE: %s\n", filename, 0, 0 );
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}
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}
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}
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closedir( datadir );
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return 0;
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}
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/* check for the addition of new attribute indexes during add */
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/* this is called after startup of the slapd server */
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/* DON'T WORRY ABOUT ACCESS RIGHTS, THAT MIGHT PREVENT US
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FROM ADDING ATTRIBUTES LATER ON */
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void
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bdb2i_check_default_attr_index_add( struct ldbminfo *li, Entry *e )
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{
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BDB2_TXN_HEAD *head = &li->li_txn_head;
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if ( head->withDefIDX == BDB2_WITH_DEF_IDX ) {
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Attribute *ap;
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for ( ap = e->e_attrs; ap != NULL; ap = ap->a_next ) {
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if ( strcasecmp( ap->a_type, "objectclass" ))
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bdb2i_txn_attr_config( li, ap->a_type, 1 );
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}
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}
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}
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/* check for the addition of new attribute indexes during modify */
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/* this is called after startup of the slapd server */
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/* DON'T WORRY ABOUT ACCESS RIGHTS, THAT MIGHT PREVENT US
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FROM ADDING ATTRIBUTES LATER ON */
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void
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bdb2i_check_default_attr_index_mod( struct ldbminfo *li, LDAPModList *modlist )
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{
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BDB2_TXN_HEAD *head = &li->li_txn_head;
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if ( head->withDefIDX == BDB2_WITH_DEF_IDX ) {
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LDAPModList *ml;
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char *default_attrs[] = { "modifytimestamp", "modifiersname", NULL };
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int attr;
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for ( ml = modlist; ml != NULL; ml = ml->ml_next ) {
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LDAPMod *mod = &ml->ml_mod;
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if (( mod->mod_op & ~LDAP_MOD_BVALUES ) == LDAP_MOD_ADD )
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if ( strcasecmp( mod->mod_type, "objectclass" ))
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bdb2i_txn_attr_config( li, mod->mod_type, 1 );
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}
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/* these attributes are default when modifying */
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for ( attr = 0; default_attrs[attr]; attr++ ) {
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bdb2i_txn_attr_config( li, default_attrs[attr], 1 );
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}
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}
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}
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