Why does "btrfs send /mnt/btrfs-root" fail with "ERROR: /mnt/btrfs-root is not read-only." even when mounted with option "ro"?

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Question as in title.

I did remount my btrfs partition as read-only

(i.e. I did "sudo mount /dev/sda9 /mnt/btrfs-root -o ro")

And when I did
  btrfs send /mnt/btrfs-root >/dev/null
I received "ERROR: /mnt/adama-docs is not read-only."

Although, when I
  sudo touch /mnt/btrfs-root/foo
I get "touch: cannot touch `/mnt/btrfs-root/foo': Read-only file system"


My btrfs --version reads
  Btrfs v0.20-rc1-56-g6cd836d

And uname -r
  3.7.8-030708-generic

Do I miss something obvious? Or should I wait until next kernel version?

--
Adam Ryczkowski
+48505919892
Skype:sisteczko

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