Btrfs-progs: introduce btrfs property subgroup

"btrfs filesystem property" is a generic interface to set/get
properties on filesystem objects (inodes/subvolumes/filesystems
/devs).

This patch adds the generic framework for properties and also
implements two properties. The first is the read-only property
for subvolumes and the second is the label property for devices.

Signed-off-by: Alexander Block <ablock84@googlemail.com>
Signed-off-by: Filipe David Borba Manana <fdmanana@gmail.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <clm@fb.com>

1 files changed, 43 insertions, 0 deletions

diff --git a/props.h b/props.h
new file mode 100644
index 00000000..faa4410e
--- /dev/null
+++ b/props.h
@@ -0,0 +1,43 @@
+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License v2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ */
+
+#ifndef PROPS_H_
+#define PROPS_H_
+
+enum prop_object_type {
+	prop_object_dev		= (1 << 0),
+	prop_object_root	= (1 << 1),
+	prop_object_subvol	= (1 << 2),
+	prop_object_inode	= (1 << 3),
+	__prop_object_max,
+};
+
+typedef int (*prop_handler_t)(enum prop_object_type type,
+			      const char *object,
+			      const char *name,
+			      const char *value);
+
+struct prop_handler {
+	const char *name;
+	const char *desc;
+	int read_only;
+	int types;
+	prop_handler_t handler;
+};
+
+extern const struct prop_handler prop_handlers[];
+
+#endif /* PROPS_H_ */