Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755286AbZD2Loh (ORCPT ); Wed, 29 Apr 2009 07:44:37 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752129AbZD2LoX (ORCPT ); Wed, 29 Apr 2009 07:44:23 -0400 Received: from rcsinet11.oracle.com ([148.87.113.123]:28981 "EHLO rgminet11.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751779AbZD2LoW (ORCPT ); Wed, 29 Apr 2009 07:44:22 -0400 Subject: Re: btrfs BUG on creating huge sparse file From: Chris Mason To: Wu Fengguang Cc: Andi Kleen , hugh@veritas.com, npiggin@suse.de, riel@redhat.com, lee.schermerhorn@hp.com, akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, x86@kernel.org, "linux-btrfs@vger.kernel.org" In-Reply-To: <20090429082151.GA15170@localhost> References: <20090407509.382219156@firstfloor.org> <20090407151010.E72A91D0471@basil.firstfloor.org> <1239210239.28688.15.camel@think.oraclecorp.com> <20090409072949.GF14687@one.firstfloor.org> <20090409075805.GG14687@one.firstfloor.org> <1239283829.23150.34.camel@think.oraclecorp.com> <20090409140257.GI14687@one.firstfloor.org> <1239287859.23150.57.camel@think.oraclecorp.com> <20090429081616.GA8339@localhost> <20090429082151.GA15170@localhost> Content-Type: text/plain Date: Wed, 29 Apr 2009 07:40:22 -0400 Message-Id: <1241005222.19174.1.camel@think.oraclecorp.com> Mime-Version: 1.0 X-Mailer: Evolution 2.24.1 Content-Transfer-Encoding: 7bit X-Source-IP: acsmt707.oracle.com [141.146.40.85] X-Auth-Type: Internal IP X-CT-RefId: str=0001.0A090208.49F83CAB.034B:SCFMA4539814,ss=1,fgs=0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1181 Lines: 34 On Wed, 2009-04-29 at 16:21 +0800, Wu Fengguang wrote: > On Wed, Apr 29, 2009 at 04:16:16PM +0800, Wu Fengguang wrote: > > On Thu, Apr 09, 2009 at 10:37:39AM -0400, Chris Mason wrote: > [snip] > > > PagePrivate is very common. try_to_releasepage failing on a clean page > > > without the writeback bit set and without dirty/locked buffers will be > > > pretty rare. > > > > Yup. btrfs seems to tag most(if not all) dirty pages with PG_private. > > While ext4 won't. > > Chris, I run into a btrfs BUG() when doing > > dd if=/dev/zero of=/b/sparse bs=1k count=1 seek=104857512345 > > The half created sparse file is > > -rw-r--r-- 1 root root 98T 2009-04-29 14:54 /b/sparse > Or > -rw-r--r-- 1 root root 107374092641280 2009-04-29 14:54 /b/sparse > > Below is the kernel messages. I can test patches you throw at me :-) > How big was the FS you were testing this on? It works for me... -chris -- 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/