From 1406e4327be3a533a2b18582f715ce2cfbcf6804 Mon Sep 17 00:00:00 2001
From: Josef Bacik <josef@redhat.com>
Date: Wed, 13 Jan 2010 18:19:06 +0000
Subject: [PATCH] Btrfs: add a "df" ioctl for btrfs

df is a very loaded question in btrfs.  This gives us a way to get the per-space
usage information so we can tell exactly what is in use where.  This will help
us figure out ENOSPC problems, and help users better understand where their disk
space is going.

Signed-off-by: Josef Bacik <josef@redhat.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
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