From mboxrd@z Thu Jan  1 00:00:00 1970
From: Prasad Joshi <prasadjoshi124@gmail.com>
Subject: List of devices added to a btrfs file system
Date: Sat, 7 Nov 2009 18:34:44 +0530
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To: linux-btrfs@vger.kernel.org
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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