Re: [PATCH 6/7] btrfs: quota: Automatically update related qgroups or mark INCONSISTENT flags when assigning/deleting a qgroup relations.

[Josef Bacik <jbacik@fb.com>]

On 02/27/2015 03:24 AM, Qu Wenruo wrote:
> Operation like qgroups assigning/deleting qgroup relations will mostly
> cause qgroup data inconsistent, since it needs to do the full rescan to
> determine whether shared extents are exclusive or still shared in
> parent qgroups.
>
> But there are some exceptions, like qgroup with only exclusive extents
> (qgroup->excl == qgroup->rfer), in that case, we only needs to
> modify all its parents' excl and rfer.
>
> So this patch adds a quick path for such qgroup in qgroup
> assign/remove routine, and if quick path failed, the qgroup status will
> be marked INCONSISTENT, and return 1 to info user-land.
>
> BTW since the quick path is much the same of qgroup_excl_accounting(),
> so move the core of it to __qgroup_excl_accounting() and reuse it.
>

Reviewed-by: Josef Bacik <jbacik@fb.com>

Thanks,

Josef