From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx1.redhat.com ([209.132.183.28]:55391 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754310Ab3BMMQ7 (ORCPT ); Wed, 13 Feb 2013 07:16:59 -0500 Date: Wed, 13 Feb 2013 13:16:55 +0100 From: Karel Zak To: =?utf-8?B?THVrw6HFoQ==?= Czerner Cc: Dave Chinner , xfs@oss.sgi.com, sandeen@redhat.com, Zach Brown , linux-btrfs@vger.kernel.org Subject: Re: [PATCH] xfs_mkfs: wipe old signatures from the device Message-ID: <20130213121655.GA7799@x2.net.home> References: <1360667215-14701-1-git-send-email-lczerner@redhat.com> <20130212202753.GC26694@dastard> <20130213080154.GC18597@x2.net.home> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 In-Reply-To: Sender: linux-btrfs-owner@vger.kernel.org List-ID: On Wed, Feb 13, 2013 at 11:41:08AM +0100, Lukáš Czerner wrote: > However > > mkfs.btrfs /dev/sda > mkfs.ext4 -F /dev/sda > > works well, however I am not sure why that is. Is that some kind of > mount(8) magic ? This is bug in libmount. Fixed in upstream tree. The libmount in some cases ignores the ambivalent probing result from libblkid and tries stuff from /etc/filesystems (where is for example ext4). > So I think that liblkid _and_ btrfs tools has to be fixed not to treat > backup superblocks as primary! The problem with additional btrfs superblocks has been already reported to btrfs guys: http://www.mail-archive.com/linux-btrfs@vger.kernel.org/msg20957.html and I don't see a reply "yep, this is btrfs-progs bug" :-) Karel -- Karel Zak http://karelzak.blogspot.com From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from relay.sgi.com (relay2.corp.sgi.com [137.38.102.29]) by oss.sgi.com (Postfix) with ESMTP id 2CC397FCA for ; Wed, 13 Feb 2013 06:17:03 -0600 (CST) Received: from cuda.sgi.com (cuda1.sgi.com [192.48.157.11]) by relay2.corp.sgi.com (Postfix) with ESMTP id 0BD95304039 for ; Wed, 13 Feb 2013 04:16:59 -0800 (PST) Received: from mx1.redhat.com (mx1.redhat.com [209.132.183.28]) by cuda.sgi.com with ESMTP id 5moXDYE7dbAPHB3u for ; Wed, 13 Feb 2013 04:16:59 -0800 (PST) Date: Wed, 13 Feb 2013 13:16:55 +0100 From: Karel Zak Subject: Re: [PATCH] xfs_mkfs: wipe old signatures from the device Message-ID: <20130213121655.GA7799@x2.net.home> References: <1360667215-14701-1-git-send-email-lczerner@redhat.com> <20130212202753.GC26694@dastard> <20130213080154.GC18597@x2.net.home> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: List-Id: XFS Filesystem from SGI List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Errors-To: xfs-bounces@oss.sgi.com Sender: xfs-bounces@oss.sgi.com To: =?utf-8?B?THVrw6HFoQ==?= Czerner Cc: Zach Brown , sandeen@redhat.com, linux-btrfs@vger.kernel.org, xfs@oss.sgi.com T24gV2VkLCBGZWIgMTMsIDIwMTMgYXQgMTE6NDE6MDhBTSArMDEwMCwgTHVrw6HFoSBDemVybmVy IHdyb3RlOgo+IEhvd2V2ZXIKPiAKPiBta2ZzLmJ0cmZzIC9kZXYvc2RhCj4gbWtmcy5leHQ0IC1G IC9kZXYvc2RhCj4gCj4gd29ya3Mgd2VsbCwgaG93ZXZlciBJIGFtIG5vdCBzdXJlIHdoeSB0aGF0 IGlzLiBJcyB0aGF0IHNvbWUga2luZCBvZgo+IG1vdW50KDgpIG1hZ2ljID8KCiBUaGlzIGlzIGJ1 ZyBpbiBsaWJtb3VudC4gRml4ZWQgaW4gdXBzdHJlYW0gdHJlZS4gVGhlIGxpYm1vdW50IGluIHNv bWUKIGNhc2VzIGlnbm9yZXMgdGhlIGFtYml2YWxlbnQgcHJvYmluZyByZXN1bHQgZnJvbSBsaWJi bGtpZCBhbmQgdHJpZXMgCiBzdHVmZiBmcm9tIC9ldGMvZmlsZXN5c3RlbXMgKHdoZXJlIGlzIGZv ciBleGFtcGxlIGV4dDQpLgoKPiBTbyBJIHRoaW5rIHRoYXQgbGlibGtpZCBfYW5kXyBidHJmcyB0 b29scyBoYXMgdG8gYmUgZml4ZWQgbm90IHRvIHRyZWF0Cj4gYmFja3VwIHN1cGVyYmxvY2tzIGFz IHByaW1hcnkhCgogVGhlIHByb2JsZW0gd2l0aCBhZGRpdGlvbmFsIGJ0cmZzIHN1cGVyYmxvY2tz IGhhcyBiZWVuIGFscmVhZHkgcmVwb3J0ZWQKIHRvIGJ0cmZzIGd1eXM6CgogICBodHRwOi8vd3d3 Lm1haWwtYXJjaGl2ZS5jb20vbGludXgtYnRyZnNAdmdlci5rZXJuZWwub3JnL21zZzIwOTU3Lmh0 bWwKCiBhbmQgSSBkb24ndCBzZWUgYSByZXBseSAieWVwLCB0aGlzIGlzIGJ0cmZzLXByb2dzIGJ1 ZyIgOi0pCgogICAgS2FyZWwKCi0tIAogS2FyZWwgWmFrICA8a3pha0ByZWRoYXQuY29tPgogaHR0 cDovL2thcmVsemFrLmJsb2dzcG90LmNvbQoKX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX18KeGZzIG1haWxpbmcgbGlzdAp4ZnNAb3NzLnNnaS5jb20KaHR0cDov L29zcy5zZ2kuY29tL21haWxtYW4vbGlzdGluZm8veGZzCg==