linux-kernel - Re: btrfs BUG on creating huge sparse file

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Date:	Wed, 29 Apr 2009 19:45:26 +0800
From:	Wu Fengguang <fengguang.wu@...el.com>
To:	Chris Mason <chris.mason@...cle.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	"hugh@...itas.com" <hugh@...itas.com>,
	"npiggin@...e.de" <npiggin@...e.de>,
	"riel@...hat.com" <riel@...hat.com>,
	"lee.schermerhorn@...com" <lee.schermerhorn@...com>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"x86@...nel.org" <x86@...nel.org>,
	"linux-btrfs@...r.kernel.org" <linux-btrfs@...r.kernel.org>
Subject: Re: btrfs BUG on creating huge sparse file

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
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