Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S265437AbUAGJpY (ORCPT ); Wed, 7 Jan 2004 04:45:24 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S266164AbUAGJpY (ORCPT ); Wed, 7 Jan 2004 04:45:24 -0500 Received: from ns.suse.de ([195.135.220.2]:14028 "EHLO Cantor.suse.de") by vger.kernel.org with ESMTP id S265437AbUAGJpX (ORCPT ); Wed, 7 Jan 2004 04:45:23 -0500 Date: Wed, 7 Jan 2004 10:43:21 +0100 From: Olaf Hering To: Jens Axboe Cc: Andrey Borzenkov , Andries Brouwer , Greg KH , linux-hotplug-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org Subject: Re: removable media revalidation - udev vs. devfs or static /dev Message-ID: <20040107094321.GC21059@suse.de> References: <200401012333.04930.arvidjaar@mail.ru> <20040103133749.A3393@pclin040.win.tue.nl> <20040103124216.GA31006@suse.de> <200401031905.31806.arvidjaar@mail.ru> <20040103175414.GX5523@suse.de> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20040103175414.GX5523@suse.de> X-DOS: I got your 640K Real Mode Right Here Buddy! X-Homeland-Security: You are not supposed to read this line! You are a terrorist! User-Agent: Mutt und vi sind doch schneller als Notes Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1302 Lines: 33 On Sat, Jan 03, Jens Axboe wrote: > On Sat, Jan 03 2004, Andrey Borzenkov wrote: > > > Is there really no way to get a media change notification from ZIP or > > > JAZ drives? > > > > If anyone knows please tell me - I will put it into supermount ... > > > > AFAIK in case of SCSI this is impossible simply by virtue of protocol - SCSI > > device is not initiator. So you need something to poll device for status. > > That is usually done on device open except in this case you can't open > > because you do not yet have handle. > > You could queue a media notification request for long periods of time, > being completed by the drive when a media change happens. At least mmc > allows for this, doubt anyone has ever done it. > > So yeah, poll... Poll how? "kmediachangethread"? Or polling in userland? The latter would (probably) lead to endless IO errors. Not very good. If I understand the Darwin sources correctly, a polling is used. But I havent looked hard how they do it. -- USB is for mice, FireWire is for men! sUse lINUX ag, nÜRNBERG - 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/