linux-kernel - Re: [PATCH] ocfs2: fix the oops problem when write cloned file

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Message-ID: <de23176f-5b84-a785-80a2-0bdc8e3a0fab@linux.alibaba.com>
Date:   Mon, 3 Feb 2020 13:15:30 +0800
From:   Joseph Qi <joseph.qi@...ux.alibaba.com>
To:     Gang He <GHe@...e.com>, "mark@...heh.com" <mark@...heh.com>,
        "jlbec@...lplan.org" <jlbec@...lplan.org>,
        "gechangwei@...e.cn" <gechangwei@...e.cn>,
        Shuning Zhang <sunny.s.zhang@...cle.com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "ocfs2-devel@....oracle.com" <ocfs2-devel@....oracle.com>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>
Subject: Re: [PATCH] ocfs2: fix the oops problem when write cloned file



On 20/2/3 10:17, Gang He wrote:
> Hello Joseph, Changwei, Sunny and all,
> 
> Could you help to review this patch? 
> This patch will fix the oops problem caused by write ocfs2 clone files.
> The root cause is inode buffer head is NULL when calling ocfs2_refcount_cow.
> Secondly, we should use EX meta lock when calling ocfs2_refcount_cow.
> 
Before commit e74540b28556, we may also use NULL buffer head in case of
overwrite, so why there is no such issue before?

Thanks,
Joseph