root@wtrpro:# mount -t btrfs -o ro,usebackuproot,rescue=all /dev/mapper/trim_0be0be30_7033_4358_a597_d11e58547d78-0 /vol2
mount: /vol2: can't read superblock on /dev/mapper/trim_0be0be30_7033_4358_a597_d11e58547d78-0.
dmesg(1) may have more information after failed mount system call.
root@wtrpro:# mount -t btrfs -o ro,usebackuproot,rescue=all /dev/mapper/trim_0be0be30_7033_4358_a597_d11e58547d78-0 /vol2