ls -l /sys/devices/virtual/block/rbd0/
total 0
-r--r--r-- 1 root root 4096 Jul 28 19:41 alignment_offset
lrwxrwxrwx 1 root root    0 Jul 28 19:41 bdi -> ../../bdi/251:0
-r--r--r-- 1 root root 4096 Jul 28 19:41 capability
-r--r--r-- 1 root root 4096 Jul 28 18:46 dev
-r--r--r-- 1 root root 4096 Jul 28 19:41 discard_alignment
-r--r--r-- 1 root root 4096 Jul 28 19:41 ext_range
drwxr-xr-x 2 root root    0 Jul 28 19:39 holders
-r--r--r-- 1 root root 4096 Jul 28 19:41 inflight
drwxr-xr-x 2 root root    0 Jul 28 19:41 power
drwxr-xr-x 3 root root    0 Jul 28 19:39 queue
-r--r--r-- 1 root root 4096 Jul 28 19:41 range
-r--r--r-- 1 root root 4096 Jul 17 23:19 removable
-r--r--r-- 1 root root 4096 Jul 28 19:39 ro
-r--r--r-- 1 root root 4096 Jul 18 12:45 size
drwxr-xr-x 2 root root    0 Jul 28 19:39 slaves
-r--r--r-- 1 root root 4096 Jul 28 19:41 stat
lrwxrwxrwx 1 root root    0 Jul 17 23:19 subsystem -> ../../../../class/block
drwxr-xr-x 2 root root    0 Jul 28 19:41 trace
-rw-r--r-- 1 root root 4096 Jul 17 23:19 uevent