btrfs-tree: add support for inode flags

Signed-off-by: Zygo Blaxell <bees@furryterror.org>

include/crucible/btrfs-tree.h

@@ -49,6 +49,7 @@ namespace crucible {
 		/// @}
 
 		/// @{ Inode items
+		uint64_t inode_flags() const;
 		uint64_t inode_size() const;
 		/// @}
 

lib/btrfs-tree.cc

@@ -157,6 +157,13 @@ namespace crucible {
 		return btrfs_get_member(&btrfs_inode_item::size, m_data);
 	}
 
+	uint64_t
+	BtrfsTreeItem::inode_flags() const
+	{
+		THROW_CHECK1(invalid_argument, btrfs_search_type_ntoa(m_type), m_type == BTRFS_INODE_ITEM_KEY);
+		return btrfs_get_member(&btrfs_inode_item::flags, m_data);
+	}
+
 	uint64_t
 	BtrfsTreeItem::file_extent_logical_bytes() const
 	{