From mboxrd@z Thu Jan 1 00:00:00 1970 From: =?ISO-8859-1?Q?Mika_Penttil=E4?= Date: Wed, 07 Jan 2004 19:23:39 +0000 Subject: Re: removable media revalidation - udev vs. devfs or static /dev Message-Id: <3FFC5CBB.5050507@kolumbus.fi> List-Id: References: <200401012333.04930.arvidjaar@mail.ru> <20040103055847.GC5306@kroah.com> <20040107185656.GB31827@kroah.com> In-Reply-To: <20040107185656.GB31827@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Greg KH Cc: Linus Torvalds , Andrey Borzenkov , linux-hotplug-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org Greg KH wrote: >On Wed, Jan 07, 2004 at 10:38:31AM -0800, Linus Torvalds wrote: > > >>On Fri, 2 Jan 2004, Greg KH wrote: >> >> >>>Doesn't the kernel always create the main block device for this device? >>>If so, udev will catch that. >>> >>> >>But udev should probably also create all the sub-nodes if it doesn't >>already. >> >> > >It doesn't, as I thought we could rely on the kernel partition support. > > > >>And it really has to create _all_ of them, exactly because there's no way >>to know ahead-of-time which of them will be available. >> >>Then, user space can just access "/dev/sda1" or whatever, and the act of >>accessing it will force the re-scan. >> >> > >Hm, that would work, but what about a user program that just polls on >the device, as the rest of this thread discusses? As removable devices >are not the "norm" it would seem a bit of overkill to create 16 >partitions for every block device, if they need them or not. > >thanks, > >greg k-h > > > Accessing the partition would not cause the rescan (accessing the whole disk causes.) I think devfs does/did this rescan on access. --Mika ------------------------------------------------------- This SF.net email is sponsored by: Perforce Software. Perforce is the Fast Software Configuration Management System offering advanced branching capabilities and atomic changes on 50+ platforms. Free Eval! http://www.perforce.com/perforce/loadprog.html _______________________________________________ Linux-hotplug-devel mailing list http://linux-hotplug.sourceforge.net Linux-hotplug-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-hotplug-devel