From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S263639AbUAHEQZ (ORCPT ); Wed, 7 Jan 2004 23:16:25 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S263646AbUAHEQZ (ORCPT ); Wed, 7 Jan 2004 23:16:25 -0500 Received: from out008pub.verizon.net ([206.46.170.108]:16589 "EHLO out008.verizon.net") by vger.kernel.org with ESMTP id S263639AbUAHEQW (ORCPT ); Wed, 7 Jan 2004 23:16:22 -0500 From: Gene Heskett Reply-To: gene.heskett@verizon.net To: Linus Torvalds , Olaf Hering Subject: Re: removable media revalidation - udev vs. devfs or static /dev Date: Wed, 7 Jan 2004 23:16:18 -0500 User-Agent: KMail/1.5.1 Cc: Greg KH , Andrey Borzenkov , linux-hotplug-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org References: <200401012333.04930.arvidjaar@mail.ru> <20040107205237.GB16832@suse.de> In-Reply-To: Organization: Organization: None that appears to be detectable by casual observers MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200401072316.18169.gene.heskett@verizon.net> X-Authentication-Info: Submitted using SMTP AUTH at out008.verizon.net from [151.205.61.108] at Wed, 7 Jan 2004 22:16:21 -0600 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Wednesday 07 January 2004 21:03, Linus Torvalds wrote: >On Wed, 7 Jan 2004, Olaf Hering wrote: >> > Then, user space can just access "/dev/sda1" or whatever, and >> > the act of accessing it will force the re-scan. >> >> How would that work? I mean, what will a tool that cares about a >> block event do? It will run a fdisk/parted -l /udev/sda to figure >> out what partitions are there (just to skip an extended partition >> sda5, as example) and finds no media. That tool will never run >> again on sda, unless a new block add event comes in. So some sort >> of polling is required for that class of devices. > >What is your problem? > >I'll use a very common and simple case that I do myself: use any USB > media reader to read a camera card. It will be a FAT filesystem on > the first partition, so your fstab might look like this: > > /dev/sda1 /mnt/smartmedia vfat > noauto,user,ro 0 0 > >and then you just do "mount /mnt/smartmedia", and you're done. > >This works. I do it all the time. You just stick in your card, and > mount it, and off it foes. No "fdisk" or "parted" _anywhere_. I do too, except the card is still in my camera when I do it. But, I do have to ask, why the ro? I regularly do housekeeping in the camera once I've downloaded the images I want. The only problem I've had is related to deleting the first images all in a row. Apparently fat thinks an empty sector is the end of the directory. So one must delete on LIFO basis. > Linus >- >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/ -- Cheers, Gene AMD K6-III@500mhz 320M Athlon1600XP@1400mhz 512M 99.22% setiathome rank, not too shabby for a WV hillbilly Yahoo.com attornies please note, additions to this message by Gene Heskett are: Copyright 2003 by Maurice Eugene Heskett, all rights reserved.