From: Joseph Qi <joseph.qi@huawei.com>
To: ocfs2-devel@oss.oracle.com
Subject: [Ocfs2-devel] [PATCH] ocfs2: fix shift left overflow
Date: Wed, 29 Jul 2015 08:30:59 +0800 [thread overview]
Message-ID: <55B81EC3.9060603@huawei.com> (raw)
In-Reply-To: <20150728135137.707a604dfd5221c952e300e8@linux-foundation.org>
On 2015/7/29 4:51, Andrew Morton wrote:
> On Mon, 27 Jul 2015 11:39:16 +0800 Joseph Qi <joseph.qi@huawei.com> wrote:
>
>> cluster pos is defined as u32, when calculate corresponding sector it
>> should be converted to u64 first, otherwise it may overflow.
>
> What are the runtime effects of this change?
>
The issue is when using large volume, for example, 9T volume with 2T already
used, frequently create small files with O_DIRECT and the IO is not cluster
aligned, it may clear sectors in the wrong place.
> Please always include this info when fixing bugs so that others can
> work out which kernel version(s) should be patched.
>
Sorry, I'll bear it in mind.
>
>
next prev parent reply other threads:[~2015-07-29 0:30 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-27 3:39 [Ocfs2-devel] [PATCH] ocfs2: fix shift left overflow Joseph Qi
2015-07-28 20:51 ` Andrew Morton
2015-07-29 0:30 ` Joseph Qi [this message]
2015-07-29 0:40 ` Andrew Morton
2015-07-29 0:59 ` Joseph Qi
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