Function SDW_add_file

src/jrd/sdw.cpp:121–266

int SDW_add_file(thread_db* tdbb, const TEXT* file_name, SLONG start, USHORT shadow_number)
{
/**************************************
 *
 *	S D W _ a d d _ f i l e
 *
 **************************************
 *
 * Functional description
 *	Add a file to a shadow set.
 *	Return the sequence number for the new file.
 *
 **************************************/
	SET_TDBB(tdbb);
	Database* dbb = tdbb->getDatabase();

	SyncLockGuard guard(&dbb->dbb_shadow_sync, SYNC_EXCLUSIVE, "SDW_add_file");

	// Find the file to be extended

	jrd_file* shadow_file = 0;
	Shadow* shadow;
	for (shadow = dbb->dbb_shadow; shadow; shadow = shadow->sdw_next)
	{
		if ((shadow->sdw_number == shadow_number) &&
			!(shadow->sdw_flags & (SDW_IGNORE | SDW_rollover)))
		{
			shadow_file = shadow->sdw_file;
			break;
		}
	}

	if (!shadow) {
		return 0;
	}

	// find the last file in the list, open the new file

	jrd_file* file = shadow_file;
	while (file->fil_next) {
		file = file->fil_next;
	}

	// Verify shadow file path against DatabaseAccess entry of firebird.conf
	if (!JRD_verify_database_access(file_name))
	{
		ERR_post(Arg::Gds(isc_conf_access_denied) << Arg::Str("database shadow") <<
													 Arg::Str(file_name));
	}

	const SLONG sequence = PIO_add_file(tdbb, shadow_file, file_name, start);
	if (!sequence)
		return 0;

	jrd_file* next = file->fil_next;

	if (dbb->dbb_flags & (DBB_force_write | DBB_no_fs_cache))
	{