From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1766618AbXEDUjU (ORCPT ); Fri, 4 May 2007 16:39:20 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1766611AbXEDUjT (ORCPT ); Fri, 4 May 2007 16:39:19 -0400 Received: from mga01.intel.com ([192.55.52.88]:40542 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1766579AbXEDUjS (ORCPT ); Fri, 4 May 2007 16:39:18 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.14,494,1170662400"; d="scan'208";a="242093562" Date: Fri, 4 May 2007 13:36:45 -0700 From: Kristen Carlson Accardi To: James Bottomley Cc: jeff@garzik.org, linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org, linux-ide@vger.kernel.org, htejun@gmail.com, akpm@linux-foundation.org Subject: Re: [patch 0/7] Asynchronous Notification for ATAPI devices (v2) - resend Message-Id: <20070504133645.7d053549.kristen.c.accardi@intel.com> In-Reply-To: <1178310603.3711.54.camel@mulgrave.il.steeleye.com> References: <20070504111222.c2e373cf.kristen.c.accardi@intel.com> <1178310603.3711.54.camel@mulgrave.il.steeleye.com> X-Mailer: Sylpheed version 2.2.10 (GTK+ 2.10.8; i386-redhat-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 04 May 2007 15:30:03 -0500 James Bottomley wrote: > On Fri, 2007-05-04 at 11:12 -0700, Kristen Carlson Accardi wrote: > > This patch series implements Asynchronous Notification (AN) for SATA > > ATAPI devices as defined in SATA 2.5 and AHCI 1.1 and higher. Drives > > which support this feature will send a notification when new media is > > inserted and removed, preventing the need for user space to poll for > > new media. This support is exposed to user space via a flag that will > > be set in /sys/block/sr*/capability_flags. If the flag is set, user > > space can disable polling for the new media, and the genhd driver will > > send a KOBJ_CHANGE event with the envp set to MEDIA_CHANGE_EVENT=1. > > > > Note that this patch only implements support for directly attached > > drives - AN with drives attached to a port multiplier requires > > additional changes. > > I seem to remember when this came up before, the observation was made > that AENs occur for many more things than simple media change notices, > so we should probably have a more generic AEN handling mechanism. Is > there any plan to move in this direction > > James > In this implementation, we use kobject_uevent_env (vs. just kobject_uevent in the original implementation) to send a KOBJ_CHANGE with the enviroment value of MEDIA_CHANGE=1. For other asynchronous events, you could still use KOBJ_CHANGE with a different env value.