Hi,

On Sat, Feb 04, 2012 at 08:40:51PM +0200, Nikos Voutsinas wrote:

There was a patch to include the subvolume mount option into /proc/mounts.
Did that make it into the kernel;

I havent' seen such patch, do you have a link?

If not, what is the formal way to find out which subvolume is mounted;

Not right now, see detailed answer to a similar question:
http://permalink.gmane.org/gmane.comp.file-systems.btrfs/15385

In short, possible but not implemented.


david