Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753711AbZD2LqV (ORCPT ); Wed, 29 Apr 2009 07:46:21 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752242AbZD2LqI (ORCPT ); Wed, 29 Apr 2009 07:46:08 -0400 Received: from mga03.intel.com ([143.182.124.21]:49714 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751019AbZD2LqH (ORCPT ); Wed, 29 Apr 2009 07:46:07 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.40,266,1239001200"; d="scan'208";a="137209341" Date: Wed, 29 Apr 2009 19:45:26 +0800 From: Wu Fengguang To: Chris Mason 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" Subject: Re: btrfs BUG on creating huge sparse file Message-ID: <20090429114526.GA24418@localhost> References: <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> <1241005222.19174.1.camel@think.oraclecorp.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1241005222.19174.1.camel@think.oraclecorp.com> User-Agent: Mutt/1.5.18 (2008-05-17) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1396 Lines: 40 On Wed, Apr 29, 2009 at 07:40:22PM +0800, Chris Mason wrote: > 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... df says: /dev/sda3 4.3G 28K 4.3G 1% /b Oh bad, I cannot reproduce it now.. Thanks, Fengguang -- 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/