linux-kernel - Re: [Ocfs2-devel] [PATCH 2/2] ocfs2: Fix d_splice

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Message-ID: <544814B7.5000300@nod.at>
Date:	Wed, 22 Oct 2014 22:33:59 +0200
From:	Richard Weinberger <richard@....at>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	linux-fsdevel@...r.kernel.org, ocfs2-devel@....oracle.com,
	linux-kernel@...r.kernel.org, Mark Fasheh <mfasheh@...e.com>
Subject: Re: [Ocfs2-devel] [PATCH 2/2] ocfs2: Fix d_splice_alias() return
 code checking

Am 21.10.2014 um 01:12 schrieb Andrew Morton:
> On Sun, 19 Oct 2014 12:39:44 +0200 Richard Weinberger <richard@....at> wrote:
> 
>> d_splice_alias() can return a valid dentry, NULL or an ERR_PTR.
>> Currently the code checks not for ERR_PTR and my oops in
>> ocfs2_dentry_attach_lock().
> 
> It's unclear what the second sentence is trying to tell us.  The patch
> fixes an oops?  If so, a copy of the trace would be useful, as would an
> explanation of why it occurred.  If not, I'm all confused.

ocfs2_dentry_attach_lock() derefs the dentry pointer.
If d_splice_alias() returns ERR_PTR(-EIO) it will oops.

Thanks,
//richard
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