cannot mount btrfs subvolume by name - No Such File or Directory

[Ryan S Kingsbury]

It is not possible to mount a btrfs subvolume by supplying the name to the subvol= argument. The mount only works by using subvolid="ID" where "ID" is the subvolume ID. If you try to mount using the name, "No such file or directory" is returned.

# sudo btrfs subvolume list /home
ID 3000 gen 109677 top level 5 path ryan/test

# sudo mount -t btrfs -o subvol=test /dev/sda1 testdir
mount: No such file or directory

# sudo mount -t btrfs -o subvolid=3000 /dev/sda1 testdir
< successful mount>

Ubuntu version:
Description: Linux Mint 17.1 Rebecca
Release: 17.1

Package version:
btrfs-tools:
  Installed: 3.12-1
  Candidate: 3.12-1
  Version table:
 *** 3.12-1 0
        500 http://archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
        100 /var/lib/dpkg/status

Expected behavior:
Subvolume can be mounted by name

Actual behavior:
Mounting only works when using the ID

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Thiago Martins (martinx)]

Same problem related here:

https://askubuntu.com/questions/585603/how-to-mount-btrfs-subvolume-it-isnt-working-mounting

[Rolf Leggewie (r0lf)]

the name of the subvolume is ryan/test, not just test, isn't it? Try that.

[Rolf Leggewie (r0lf)]

Ubuntu has not shipped a btrfs package for a long time, moving to generic Ubuntu for triage.

[Launchpad Janitor (janitor)]

[Expired for Ubuntu because there has been no activity for 60 days.]