[Bug 1348430] [NEW] btrfs send does not work for snapshots in subvolumes

[Jochen Schroeder]

Public bug reported:

If I create a snapshot, of a subvolume and try to use btrfs send it
fails with "No such file or directory"

# sudo btrfs sub create /testvol
Create subvolume '//testvol'
# sudo btrfs
btrfs               btrfsck             btrfs-debug-tree    btrfs-image         btrfs-select-super  btrfstune           
btrfs-calc-size     btrfs-convert       btrfs-find-root     btrfs-map-logical   btrfs-show-super    btrfs-zero-log      
# sudo btrfs sub list /
ID 257 gen 16298 top level 5 path @
ID 276 gen 16298 top level 257 path testvol
# sudo btrfs sub snap -r /t
testvol/ tmp/     
# sudo btrfs sub snap -r /testvol/ /test-snap
Create a readonly snapshot of '/testvol/' in '//test-snap'
# sudo btrfs sub list /
ID 257 gen 16299 top level 5 path @
ID 276 gen 16299 top level 257 path testvol
ID 277 gen 16299 top level 257 path test-snap
# sudo btrfs send /test-snap/ > /dev/null
At subvol /test-snap/
ERROR: open @/test-snap failed. No such file or directory

This error has been reported upstream:
https://bugzilla.kernel.org/show_bug.cgi?id=69401

Because ubuntu creates /home and / on subvolumes this currently prevents
backup solutions based on btrfs send.

** Affects: btrfs-tools (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1348430

Title:
  btrfs send does not work for snapshots in subvolumes

Status in “btrfs-tools” package in Ubuntu:
  New

Bug description:
  If I create a snapshot, of a subvolume and try to use btrfs send it
  fails with "No such file or directory"

  # sudo btrfs sub create /testvol
  Create subvolume '//testvol'
  # sudo btrfs
  btrfs               btrfsck             btrfs-debug-tree    btrfs-image         btrfs-select-super  btrfstune           
  btrfs-calc-size     btrfs-convert       btrfs-find-root     btrfs-map-logical   btrfs-show-super    btrfs-zero-log      
  # sudo btrfs sub list /
  ID 257 gen 16298 top level 5 path @
  ID 276 gen 16298 top level 257 path testvol
  # sudo btrfs sub snap -r /t
  testvol/ tmp/     
  # sudo btrfs sub snap -r /testvol/ /test-snap
  Create a readonly snapshot of '/testvol/' in '//test-snap'
  # sudo btrfs sub list /
  ID 257 gen 16299 top level 5 path @
  ID 276 gen 16299 top level 257 path testvol
  ID 277 gen 16299 top level 257 path test-snap
  # sudo btrfs send /test-snap/ > /dev/null
  At subvol /test-snap/
  ERROR: open @/test-snap failed. No such file or directory

  This error has been reported upstream:
  https://bugzilla.kernel.org/show_bug.cgi?id=69401

  Because ubuntu creates /home and / on subvolumes this currently
  prevents backup solutions based on btrfs send.

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