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Date: Mon, 27 Feb 2012 11:26:28 +0530
From: Nageswara R Sastry <rnsastry@linux.vnet.ibm.com>
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To: Liu Bo <liubo2009@cn.fujitsu.com>
CC: linux-btrfs@vger.kernel.org, linux-kernel@vger.kernel.org,
        chris.mason@oracle.com, kamalesh@linux.vnet.ibm.com
Subject: Re: [BUG] Kernel Bug at fs/btrfs/volumes.c:3638
References: <4F476959.2010400@linux.vnet.ibm.com> <4F487BB5.1060706@cn.fujitsu.com>
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On ఫిబ్రవరి 25 శనివారం 2012 ఉ. 11:42, Liu Bo wrote:
> Hi, I guess you're mounting a quite small partition. Given that this 
> oops is in such an early stage, could you please show 1) your 
> mkfs.btrfs options and 2) the log of "btrfs-debug-tree /dev/loop0"? 
> thanks, liubo
Here are the steps with options,

1. dd if=/dev/zero of=<filename.img> bs=1M count=16

2. mkfs.btrfs <filename.img>

3. Corrupt the <filename.img> using 'mangle'

4. mount -t btrfs -o loop <filename.img> <mount point>

5. # btrfs-debug-tree <filename.img>
Couldn't map the block 3221392384
Couldn't read chunk root
unable to open <filename.img>
# btrfs-debug-tree /dev/loop0
Couldn't map the block 3221392384
Couldn't read chunk root
unable to open /dev/loop0

Regards,
R.Nageswara Sastry

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