$OpenBSD: patch-src_lib-index_mail-index-data_c,v 1.1 2003/07/23 06:03:01 jolan Exp $
--- src/lib-index/mail-index-data.c.orig	Thu May 29 16:55:58 2003
+++ src/lib-index/mail-index-data.c	Tue Jul 15 15:17:26 2003
@@ -133,6 +133,12 @@ static int mmap_update(struct mail_index
 {
 	struct mail_index_data_header *hdr;
 
+	if (data->index->mmap_invalidate && data->mmap_base != NULL) {
+		if (msync(data->mmap_base, data->mmap_used_length,
+			  MS_SYNC | MS_INVALIDATE) < 0)
+			return index_data_set_syscall_error(data, "msync()");
+	}
+
 	if (data->header != NULL &&
 	    data->header->indexid != data->index->indexid) {
 		if (data->header->indexid != 0) {