From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Martin J. Bligh" Date: Thu, 08 Jan 2004 01:07:33 +0000 Subject: Re: removable media revalidation - udev vs. devfs or static /dev Message-Id: <16970000.1073524052@[10.10.2.4]> List-Id: References: <200401012333.04930.arvidjaar@mail.ru> <20040103055847.GC5306@kroah.com> <20040107185656.GB31827@kroah.com> <20040107195032.GB823@kroah.com> <14870000.1073521945@[10.10.2.4]> <20040108004124.GA3388@kroah.com> In-Reply-To: <20040108004124.GA3388@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 Wednesday, January 07, 2004 16:41:24 -0800): > On Wed, Jan 07, 2004 at 04:32:26PM -0800, Martin J. Bligh wrote: >> >> NOTE! We do have an alternative: if we were to just make block device >> >> nodes support "readdir" and "lookup", you could just do >> >> >> >> open("/dev/sda/1" ...) >> >> >> >> and it magically works right. I've wanted to do this for a long time, but >> >> every time I suggest allowing it, people scream. >> > >> > Hm, that would be nice. I don't remember seeing it being proposed >> > before, what are the main complaints people have with this? >> >> Couldn't the partitions go under "/dev/sdaX/{1,2,3}" and solve the same >> problem without doing magic on the devices? > > No, that's not the point. As discussed on irc, I think you now > understand the issue (partitions not being present, media changed > without kernel knowing about it, etc.) I think it is the point ... you don't need to scan the device until someone does "readdir" / "lookup" as Linus says above. Just this way there's no duplexing of the block devices, just a magic directory node (which might avoid the screams Linus mentions). And it gets rid of the polling crap. M. ------------------------------------------------------- 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