On Thu, 2010-12-09 at 14:51 +0100, Michael Niederle wrote: > Hi! > > I'm currently writing a btrfs-rescue tool and therefor began to study the > btrfs-on-disk structures in detail. > > The root tree contains a ROOT_ITEM entry for *every* subvolume in the whole > file system, but only DIR_ITEM entries for subvolumes that were created in the > root directory of the filesystem. > > If we have a destroyed root directory, there is no way to access subvolumes > stored deeper in the fs-tree by name. It might be nice to have the ability to > mount a subvolume by object-id. A simple tool could list all available > subvolumes with their object-ids, generation numbers, and so on. Unless I misunderstand something, this is actually already possible; just poorly documented. You can use the 'subvolid=' mount option to mount by object id; the object id can be found using the tool btrfs subvolume list <filesystem> The subvolid= mount option was missing from the wiki, so I've just added it: https://btrfs.wiki.kernel.org/index.php/Getting_started#Mount_Options -- Calvin Walton <calvin.walton@xxxxxxxxx> -- 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
