From a3189e21e6d4249a258bf547becb28b8d9c23919 Mon Sep 17 00:00:00 2001
From: David Greenman <dg@FreeBSD.org>
Date: Sat, 22 Oct 1994 02:21:53 +0000
Subject: [PATCH] Restrict fs_maxfilesize to 2^40; this is part of a bug fix
 from Kirk McKusick to work around problems in FFS related to the blkno of a
 64bit offset not fitting into an int.

Submitted by:	Marshall Kirk McKusick
---
 sbin/newfs/mkfs.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sbin/newfs/mkfs.c b/sbin/newfs/mkfs.c
index 4ca25a23f495..062a82d66c5b 100644
--- a/sbin/newfs/mkfs.c
+++ b/sbin/newfs/mkfs.c
@@ -284,6 +284,8 @@ mkfs(pp, fsys, fi, fo)
 		sizepb *= NINDIR(&sblock);
 		sblock.fs_maxfilesize += sizepb;
 	}
+	/* XXX - hack to prevent overflow of a 32bit block number */
+	sblock.fs_maxfilesize = MIN(sblock.fs_maxfilesize, (u_quad_t) 1 << 39);
 	/*
 	 * Validate specified/determined secpercyl
 	 * and calculate minimum cylinders per group.