[PATCH 4/5] Btrfs-progs: add type root to label property

[Filipe David Borba Manana <fdmanana@gmail.com>]

So that we can get the label of a mounted filesystem.

Before this change:

        $ btrfs prop get /mnt/btrfs label
        ERROR: object is not compatible with property

        $ btrfs prop get /dev/sdb3 label
        ERROR: dev /dev/sdb3 is mounted, use mount point
        ERROR: failed to set/get property for object.

After this change:

        $ btrfs prop get /mnt/btrfs label
        label=foobar

Signed-off-by: Filipe David Borba Manana <fdmanana@gmail.com>
---
 props.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/props.c b/props.c
index 763fd57..12fdc52 100644
--- a/props.c
+++ b/props.c
@@ -105,6 +105,7 @@ static int prop_label(enum prop_object_type type,
 const struct prop_handler prop_handlers[] = {
 	{"ro", "Set/get read-only flag of subvolume.", 0, prop_object_subvol,
 	 prop_read_only},
-	{"label", "Set/get label of device.", 0, prop_object_dev, prop_label},
+	{"label", "Set/get label of device.", 0,
+	 prop_object_dev | prop_object_root, prop_label},
 	{0, 0, 0, 0, 0}
 };
-- 
1.7.9.5