Jan Kara wrote:
> 
>   There are two quota formats:

Ah.  user error :)

>  The first in Linus's tree - it uses file quota.user and it's
> simple flat file (and I agree that hole in it can cause deadlock :().
>   The second in Alan's tree - it uses file aquota.user and it
> has more complicated file format. The deadlock you've shown can't
> happen in Alan's tree because lock_dquot() was removed from write path
> (it's now used only during first read).

OK, that explains why the deadlock didn't happen in -ac.  Thanks.
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