linux-ext4 - Re: Exciting :-( adventures in metadata checksumming

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Message-ID: <20120808223427.26158.qmail@science.horizon.com>
Date:	8 Aug 2012 18:34:27 -0400
From:	"George Spelvin" <linux@...izon.com>
To:	linux-ext4@...r.kernel.org, tytso@....edu
Cc:	linux@...izon.com
Subject: Re: Exciting :-( adventures in metadata checksumming

Yay!  It happened again!

[397113.459309] EXT4-fs error (device md0): ext4_iget:3821: inode #100691970: comm updatedb.mlocat: checksum invalid
[397113.459315] Aborting journal on device md0-8.
[397113.496222] EXT4-fs (md0): Remounting filesystem read-only

However, trying to preserve the evidence runs into a problem:

/root# e2image -Q /dev/md0 md0.qcow2
e2image 1.43-WIP (1-Aug-2012)
e2image: Inode checksum does not match inode while getting next inode
/root# ls -l md0.qcow2
-rw------- 1 root root 0 Aug  8 18:30 md0.qcow2

e2image aborts on the checksum error, preventing me from capturing a useful
image.

Can someone find a workaround QUICKLY?  I can't keep this FS read-only
for long.

Thanks!
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