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

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Date:	Wed, 29 Apr 2009 07:40:22 -0400
From:	Chris Mason <chris.mason@...cle.com>
To:	Wu Fengguang <fengguang.wu@...el.com>
Cc:	Andi Kleen <andi@...stfloor.org>, hugh@...itas.com,
	npiggin@...e.de, riel@...hat.com, lee.schermerhorn@...com,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.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, 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


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