Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932072AbVKTVWq (ORCPT ); Sun, 20 Nov 2005 16:22:46 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932070AbVKTVWq (ORCPT ); Sun, 20 Nov 2005 16:22:46 -0500 Received: from atrey.karlin.mff.cuni.cz ([195.113.31.123]:59877 "EHLO atrey.karlin.mff.cuni.cz") by vger.kernel.org with ESMTP id S1750795AbVKTVWq (ORCPT ); Sun, 20 Nov 2005 16:22:46 -0500 Date: Sat, 19 Nov 2005 23:44:50 +0000 From: Pavel Machek To: Hui Cheng Cc: Alejandro Bonilla , Pavel Machek , kernelnewbies@nl.linux.org, linux-kernel@vger.kernel.org Subject: Re: How to quickly detect the mode change of a hard disk? Message-ID: <20051119234450.GB1952@spitz.ucw.cz> References: <20051116185628.M35560@linuxwireless.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.3.27i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1535 Lines: 35 Hi! > > > > I am currently doing a kernel module involves detecting/changing > > > > disk mode among STANDBY and ACTIVE/IDLE. I used ide_cmd_wait() to issue > > > > commands like WIN_IDLEIMMEDIATELY and WIN_STANDBYNOW1. The problem is, a > > > > drive in standby mode will automatically awake whenever a disk operation > > > > is requested and I need to know the mode change as soon as possible. (So I > > > > > > AFAIK there's no nice way to get that info, but it is useful, so > > > patch would be welcome. > > > > I would check the hdparm man page again. Still, it sounds interesting. > > > > Additionally, it could be cool if someone could finish up or make the option > > for the HD freeze to use it with the HDAPS driver. ;-) > > > > .Alejandro > > > > Thanks for reply :) What I did to handle this problem is a little stupid > : Suppose the disk is now in a standby mode. In case that there is a > request sent to the disk drive, a kernel thread is awake to detect/update > the current disk power mode. The disk power mode is stored in the > ide_drive_t structure and be protected by lock. It seems to work fine in > my simple tests. But again, there should be better solutions. Can we get the patch? -- 64 bytes from 195.113.31.123: icmp_seq=28 ttl=51 time=448769.1 ms - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/