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.
| -a | Search through all metadata extents, even the root has been already found. |
| -g <generation> | |
| Filter root tree by it's original transaction id, tree root's generation in default. | |
| -o <objectid> | Filter root tree by it's objectid,tree root's objectid in default. |
| -l <level> | 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.