List of devices added to a btrfs file system

[Prasad Joshi <prasadjoshi124@gmail.com>]

Hi All,

I want to know the list of devices added to a mounted btrfs file
system. I could not figure out how to find the list.

I created file system on 2 devices. Now I could mount the file system
using any device.
$ mkfs.btrfs /dev/sdb /dev/sdc

$ mount -t btrfs /dev/sdb /mnt

$ umount /mnt

$ mount -t btrfs /dev/sdc /mnt

$ mount -t btrfs /dev/sdb /mnt
mount -t btrfs /dev/sdb /mnt
mount: /dev/sdb already mounted or /mnt busy
mount: according to mtab, /dev/sdc is already mounted on /mnt

This works really fine, but there should be a way to list the number
of device and device names added to the file system. Is there any way
to get that list?

Thanks and Regards,
Prasad