[Bug 1689621] Re: fix empty subvolume send and receive

[Stéphane Graber]

** Also affects: btrfs (Ubuntu Zesty)
   Importance: Undecided
       Status: New

** Package changed: btrfs (Ubuntu) => btrfs-progs (Ubuntu)

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https://bugs.launchpad.net/bugs/1689621

Title:
  fix empty subvolume send and receive

Status in btrfs-progs package in Ubuntu:
  New
Status in btrfs-progs source package in Zesty:
  New

Bug description:
  The original report can be found here:
  https://bugzilla.kernel.org/show_bug.cgi?id=195597

  The reproducer for this issue is:

  truncate -s 10GB pool.btrfs
  mkfs.btrfs pool.btrfs
  mount -t btrfs pool.btrfs /mnt
  btrfs subvolume create /mnt/a
  btrfs subvolume snapshot /mnt/a /mnt/snap-a
  btrfs send /mnt/snap-a | btrfs receive /mnt/a

  should incorrectly fail with

  ERROR: empty stream is not considered valid

  whereas it should actually succeed. I've pushed a patch
  for this to btrfs upstream (https://bugzilla.kernel.org/attachment.cgi?id=256157)
  which is already merged. We should SRU it.

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