Section: Btrfs Manual (8)
btrfs-find-root - filter to find btrfs root
btrfs-find-root [options] <device>
btrfs-find-root is used to find the satisfied root, you can filter by root tree's objectid, generation, level.
Search through all metadata extents, even the root has been already found.
Filter root tree by it's original transaction id, tree root's generation in default.
Filter root tree by it's objectid,tree root's objectid in default.
Filter root tree by B-+ tree's level, level 0 in default.
btrfs-find-root will return 0 if no error happened. If any problems happened, 1 will be returned.