On Fri, Nov 11, 2011 at 08:31:48PM +0000, Xin LI wrote:
> Author: delphij
> Date: Fri Nov 11 20:31:48 2011
> New Revision: 227454
> URL: http://svn.freebsd.org/changeset/base/227454
> 
> Log:
>   Use __packed to prevent alignment from taking place, which otherwise may
>   change the on-disk format in an incompatible way.  Without this change,
>   msdosfs created on FreeBSD/arm would not be mountable.
>   
>   PR:         bin/162486
>   Submitted by:       Ian Lepore <freebsd damnhippie dyndns org>
>   Reported by:        Mattia Rossi <mrossi at swin.edu.au>
>   MFC after:  3 days

I suspect there is much more places with the similar issues.
FAT structure definitions were not centralized, AFAIR.

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