Are there any btrfs commands (or APIs) to allow a script to create a list of all the extents referred to within a particular (mounted) subvolume? And is it a reasonably efficient process (i.e. doesn't involve backrefs and, preferably, doesn't involve following directory trees)? I am not looking to relate the extents to files/inodes/paths. My particular need, at the moment, is to work out how much of two snapshots is shared data, but I can think of other uses for the information. Graham -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
