linux-kernel - [PATCH] fix minixfs block limit check

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Message-ID: <4FAACF55.5070809@gmail.com>
Date:	Wed, 09 May 2012 22:11:01 +0200
From:	Vladimir 'φ-coder/phcoder' Serbinenko 
	<phcoder@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: [PATCH] fix minixfs block limit check

Hello, all. On minix2 and minix3 usually max_size is 7fffffff and the
check in question prohibits creation of last block spanning right before
7fffffff. Here is a fix:

--- fs/minix/itree_v2.c    2011-04-23 01:34:36.363725380 +0200
+++ /home/phcoder/projects/fs/minix/itree_v2.c    2012-05-09
21:47:52.335621065 +0200
@@ -32,7 +32,8 @@
     if (block < 0) {
         printk("MINIX-fs: block_to_path: block %ld < 0 on dev %s\n",
             block, bdevname(sb->s_bdev, b));
-    } else if (block >=
(minix_sb(inode->i_sb)->s_max_size/sb->s_blocksize)) {
+    } else if ((u64) block * (u64) sb->s_blocksize
+           >= minix_sb(inode->i_sb)->s_max_size) {
         if (printk_ratelimit())
             printk("MINIX-fs: block_to_path: "

-- 
Regards
Vladimir 'φ-coder/phcoder' Serbinenko



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