From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Michael Niederle" Subject: mount snapshot by object-id Date: Thu, 9 Dec 2010 14:51:14 +0100 Message-ID: <20101209145114.07f55914@simplux> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII To: "linux-btrfs@vger.kernel.org" Return-path: List-ID: 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. Greetings, Michael