From 7fde62bffb576d384ea49a3aed3403d5609ee5bc Mon Sep 17 00:00:00 2001
From: Chris Mason <chris.mason@oracle.com>
Date: Tue, 16 Mar 2010 15:40:10 -0400
Subject: [PATCH] Btrfs: buffer results in the space_info ioctl

The space_info ioctl was using copy_to_user inside rcu_read_lock.  This
commit changes things to copy into a buffer first and then dump the
result down to userland.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
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