From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jim <jim@webstarts.com>
Subject: can't snapshot
Date: Mon, 10 Oct 2011 11:14:10 -0400
Message-ID: <4E930BC2.4080405@webstarts.com>
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To: linux-btrfs <linux-btrfs@vger.kernel.org>
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Good morning Btrfs list,
I am trying to create a subvolume of a directory tree (approximately 1.1 
million subvolumes under nfs1).  The following error is thrown and 
without the wiki I don't know what argument is needed.  I am running 
kernel 3.1.0-rc4.

[root@btrfs ~]# btrfs sub snapshot /btrfs/nfs1/ /btrfs/snaps/
Invalid arguments for subvolume snapshot
[root@btrfs ~]# btrfs sub list /btrfs | head
ID 256 top level 5 path nfs1
ID 257 top level 5 path nfs2
ID 258 top level 5 path nfs2/data
ID 259 top level 5 path nfs1/data
ID 260 top level 5 path nfs1/data/sites
ID 261 top level 5 path nfs2/data/sites
ID 262 top level 5 path nfs2/data/sites/0420
ID 263 top level 5 path nfs2/data/sites/0421
ID 264 top level 5 path nfs2/data/sites/0422
ID 265 top level 5 path nfs2/data/sites/0423

Any help is appreciated
Thanks
Jim