linux-kernel - Re: [PATCH] fix UFS superblock alignment issues

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Message-ID: <45476A36.2020405@redhat.com>
Date:	Tue, 31 Oct 2006 09:22:30 -0600
From:	Eric Sandeen <sandeen@...hat.com>
To:	"'linux-kernel@...r.kernel.org'" <linux-kernel@...r.kernel.org>
CC:	Evgeniy Dushistov <dushistov@...l.ru>
Subject: Re: [PATCH] fix UFS superblock alignment issues

Eric Sandeen wrote:
> ufs2 fails to mount on x86_64, claiming bad magic.  This is because 
> ufs_super_block_third's fs_un1 member is padded out by 4 bytes for
> 8-byte alignment, pushing down the rest of the struct.
> 
> Forcing this to be packed solves it.  I took a quick look over
> other on-disk structures and didn't immediately find other problems.
> I was able to mount & ls a populated ufs2 filesystem w/ this change.

I should also mention that this seems to be a regression from
2.6.17->2.6.18, so perhaps it's a candidate for 2.6.18.x updates.

Thanks,

-Eric
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