ubuntu@ubuntu:~$ ll /dev/mapper
total 0
drwxr-xr-x  2 root root      80 Jun  1 16:11 ./
drwxr-xr-x 21 root root    4700 Jun  1 16:11 ../
crw-------  1 root root 10, 236 May 29 17:04 control
lrwxrwxrwx  1 root root       7 Jun  1 16:11 loop1p4 -> ../dm-0