From: Kees Jongenburger <keesj@minix3.org>
Date: Thu, 18 Apr 2013 15:38:46 +0000 (+0200)
Subject: mkfs.mfs:add comment about the overflow check.
X-Git-Tag: v3.3.0~1019
X-Git-Url: http://zhaoyanbai.com/repos/man.rndc.html?a=commitdiff_plain;h=04ad4fa1a29508db6f581eadd8c4eead51421609;p=minix.git

mkfs.mfs:add comment about the overflow check.

Change-Id: I1f09c3a62377164296037f6dc9b7874023123311
---

diff --git a/usr.sbin/mkfs.mfs/mkfs.c b/usr.sbin/mkfs.mfs/mkfs.c
index a513e8170..88c35eb6a 100644
--- a/usr.sbin/mkfs.mfs/mkfs.c
+++ b/usr.sbin/mkfs.mfs/mkfs.c
@@ -562,11 +562,14 @@ ino_t inodes;
   
 #define BIGGERBLOCKS "Please try a larger block size for an FS of this size.\n"
   sup->s_imap_blocks = nb = bitmapsize((uint32_t) (1 + inodes), block_size);
+  /* Checks for an overflow nb is uint32_t while s_imap_blocks is of type 
+   * int16_t */
   if(sup->s_imap_blocks != nb) {
 	fprintf(stderr, "mkfs: too many inode bitmap blocks.\n" BIGGERBLOCKS);
 	exit(1);
   }
   sup->s_zmap_blocks = nb = bitmapsize((uint32_t) zones, block_size);
+  /* Idem here check for overflow */
   if(nb != sup->s_zmap_blocks) {
 	fprintf(stderr, "mkfs: too many block bitmap blocks.\n" BIGGERBLOCKS);
 	exit(1);