linux-kernel - Re: [PATCH 2/4] chardev: Increment cdev reference count when i

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Message-ID: <20141104154030.GI7996@ZenIV.linux.org.uk>
Date:	Tue, 4 Nov 2014 15:40:30 +0000
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Jan Kara <jack@...e.cz>
Cc:	hch@....de, linux-fsdevel@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/4] chardev: Increment cdev reference count when i_cdev
 references it

On Tue, Nov 04, 2014 at 04:37:52PM +0100, Jan Kara wrote:
> On Tue 04-11-14 14:46:11, Al Viro wrote:
> > On Wed, Oct 22, 2014 at 10:14:11PM +0200, Jan Kara wrote:
> > > Currently i_cdev reference to a character device isn't accounted in the
> > > reference count of the character device. This then requires us to track
> > > all references through a list of all inodes referencing a character
> > > device which is somewhat clumsy and requires list_head in each inode in
> > > the system.
> > > 
> > > So make i_cdev a reference like any other.
> > 
> > So no rmmod for you until an inode of character device node you had
> > closed a while ago finally gets evicted from icache?  Or am I misreading
> > you?
>   Yes, this is a consequence of the change. I should have noted in the
> changelog I guess.

That consequence looks broken, IMO.
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