linux-kernel - Re: missing mnt_drop

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Date:	Tue, 25 Sep 2007 16:24:35 -0700
From:	Dave Hansen <haveblue@...ibm.com>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: missing mnt_drop_write() on open error

On Wed, 2007-09-26 at 01:14 +0200, Miklos Szeredi wrote:
> I get this at umount, if there was a failed open():
> 
> WARNING: at fs/namespace.c:586 __mntput()
> 
> I think the problem is that may_open() calls mnt_want_write(), but if
> open doesn't succeed, mnt_drop_write() will not be called.

I see what you're talking about, and it does look like a bug to me.  I'm
working on establishing where the 'struct file' gets created in relation
to all of this, and where best we should back out the write count.

I should have a patch in a few.

-- Dave

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