From c556723794b3487a79de1ecd6354975b1389f5ff Mon Sep 17 00:00:00 2001
From: Arne Jansen <sensille@gmx.net>
Date: Wed, 14 Sep 2011 15:44:05 +0200
Subject: [PATCH] Btrfs: hooks to reserve qgroup space

Like block reserves, reserve a small piece of space on each
transaction start and for delalloc. These are the hooks that
can actually return EDQUOT to the user.
The amount of space reserved is tracked in the transaction
handle.

Signed-off-by: Arne Jansen <sensille@gmx.net>
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