linux-ext4 - metadata_csum + unclean shutdown = failure to boot

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Message-ID: <20121007050427.6711.qmail@science.horizon.com>
Date:	7 Oct 2012 01:04:27 -0400
From:	"George Spelvin" <linux@...izon.com>
To:	linux-ext4@...r.kernel.org
Cc:	linux@...izon.com
Subject: metadata_csum + unclean shutdown = failure to boot

Feeling a bit adventurous, I enabled metadata_csum on many of
my daily-use file systems.

I have now noticed a problem in the event of an unclean shutdown.

On reboot, the kernel complains about a bad superblock checksum, suggests
e2fsck, and then fails to mount the root filesystem.

This makes running e2fsck a bit problematic.

I can fix it manually, but it makes automatic reboots *extremely*
problematic.

Is it possible to fix the kernel code to be a bit more forgiving?
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