From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mout.gmx.net ([212.227.15.18]:54542 "EHLO mout.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752233AbaJBWLx (ORCPT ); Thu, 2 Oct 2014 18:11:53 -0400 From: Marc Dietrich To: dsterba@suse.cz Cc: linux-btrfs@vger.kernel.org Subject: Re: FIBMAP unsupported Date: Fri, 03 Oct 2014 00:11:25 +0200 Message-ID: <6603452.o3OqIjYaDr@ax5200p> In-Reply-To: <2356843.HqzAreCEMf@ax5200p> References: <6602102.lhBckFYBLs@fb07-iapwap2> <20141002172549.GV11436@twin.jikos.cz> <2356843.HqzAreCEMf@ax5200p> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Sender: linux-btrfs-owner@vger.kernel.org List-ID: Am Donnerstag 02 Oktober 2014, 21:55:55 schrieb Marc Dietrich: > Will try to restore the file using btrfs restore.... ok, restore worked. I did some more tests. This is unrelated to CoW. It seems that the "fallocate -n" in combination with "dd conv=notrunc" using large files (>10G) triggers it. Maybe this rings some bells. Marc