Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757382AbYLPBkT (ORCPT ); Mon, 15 Dec 2008 20:40:19 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752298AbYLPBkD (ORCPT ); Mon, 15 Dec 2008 20:40:03 -0500 Received: from mail-ew0-f31.google.com ([209.85.219.31]:48108 "EHLO mail-ew0-f31.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752156AbYLPBkA (ORCPT ); Mon, 15 Dec 2008 20:40:00 -0500 Message-ID: Date: Tue, 16 Dec 2008 02:39:57 +0100 From: "Kay Sievers" To: "Chris Mason" Subject: Re: Btrfs trees for linux-next Cc: "Andreas Dilger" , "Andrew Morton" , "Stephen Rothwell" , linux-kernel@vger.kernel.org, linux-btrfs@vger.kernel.org, linux-fsdevel In-Reply-To: <1229391447.27573.6.camel@think.oraclecorp.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <1227183484.6161.17.camel@think.oraclecorp.com> <1228962896.21376.11.camel@think.oraclecorp.com> <20081211141436.030c2d65.sfr@canb.auug.org.au> <20081210200604.8e190b0d.akpm@linux-foundation.org> <1229006596.22236.46.camel@think.oraclecorp.com> <20081215210323.GB5000@webber.adilger.int> <1229391447.27573.6.camel@think.oraclecorp.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1536 Lines: 31 On Tue, Dec 16, 2008 at 02:37, Chris Mason wrote: > On Mon, 2008-12-15 at 23:55 +0100, Kay Sievers wrote: >> On Mon, Dec 15, 2008 at 22:03, Andreas Dilger wrote: >> > On Dec 11, 2008 09:43 -0500, Chris Mason wrote: >> >> The multi-device code uses a very simple brute force scan from userland >> >> to populate the list of devices that belong to a given FS. Kay Sievers >> >> has some ideas on hotplug magic to make this less dumb. (The scan isn't >> >> required for single device filesystems). >> > >> > This should use libblkid to do the scanning of the devices, and it can >> > cache the results for efficiency. Best would be to have the same LABEL+UUID >> > for all devices in the same filesystem, and then once any of these devices >> > are found the mount.btrfs code can query the rest of the devices to find >> > the remaining parts of the filesystem. >> >> Which is another way to do something you should not do that way in the >> first place, just with a library instead of your own code. >> > > Well, its the same library everyone else is using to do things they > shouldn't be doing ;) Util-linux-ng can be configured to use libvolume_id and udev data, and it's not used in SUSE and Ubuntu for exactly the reason mentioned. :) Kay -- 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/