ext2 fix

[<Andries.Brouwer@cwi.nl>]

Mounting an ext2 filesystem with zero s_inodes_per_group
will cause a divide error. Below a patch against 2.6.17.8.

Andries

diff -uprN -X /linux/dontdiff a/fs/ext2/super.c b/fs/ext2/super.c
--- a/fs/ext2/super.c	2006-08-07 16:01:12.000000000 +0200
+++ b/fs/ext2/super.c	2006-08-22 12:36:45.682620352 +0200
@@ -776,7 +776,7 @@ static int ext2_fill_super(struct super_
 	if (EXT2_INODE_SIZE(sb) == 0)
 		goto cantfind_ext2;
 	sbi->s_inodes_per_block = sb->s_blocksize / EXT2_INODE_SIZE(sb);
-	if (sbi->s_inodes_per_block == 0)
+	if (sbi->s_inodes_per_block == 0 || sbi->s_inodes_per_group == 0)
 		goto cantfind_ext2;
 	sbi->s_itb_per_group = sbi->s_inodes_per_group /
 					sbi->s_inodes_per_block;
-
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