From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754124AbaKDPiB (ORCPT ); Tue, 4 Nov 2014 10:38:01 -0500 Received: from cantor2.suse.de ([195.135.220.15]:53839 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751841AbaKDPh4 (ORCPT ); Tue, 4 Nov 2014 10:37:56 -0500 Date: Tue, 4 Nov 2014 16:37:52 +0100 From: Jan Kara To: Al Viro Cc: Jan Kara , hch@lst.de, linux-fsdevel@vger.kernel.org, LKML Subject: Re: [PATCH 2/4] chardev: Increment cdev reference count when i_cdev references it Message-ID: <20141104153752.GB21902@quack.suse.cz> References: <1414008853-13200-1-git-send-email-jack@suse.cz> <1414008853-13200-3-git-send-email-jack@suse.cz> <20141104144611.GE7996@ZenIV.linux.org.uk> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20141104144611.GE7996@ZenIV.linux.org.uk> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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. Honza -- Jan Kara SUSE Labs, CR