[Bug 1317491] Re: virsh blockcommit hangs at 100%

[Rafael David Tinoco]

# Testing to merge <intermediate> into <base> (both are offline):

inaddy@(kvm02):~$ virsh blockcommit --domain guest --path=/var/lib/libvirt/images/guest.1487875788 --top=/var/lib/librt/images/guest.1487745012 --base=/var/lib/libvirt/images/guest.qcow2 --wait --verbose
Block Commit: [100 %]
Commit complete

It works:

inaddy@(kvm02):~$ : virsh domblklist --domain guest
Target     Source
------------------------------------------------
vda        /var/lib/libvirt/images/guest.1487875788

inaddy@(kvm02):~$ sudo qemu-img info --backing-chain /var/lib/libvirt/images/guest.1487875788
image: /var/lib/libvirt/images/guest.1487875788
file format: qcow2
virtual size: 30G (32212254720 bytes)
disk size: 2.4M
cluster_size: 65536
backing file: /var/lib/libvirt/images/guest.qcow2
backing file format: qcow2
Format specific information:
    compat: 1.1
    lazy refcounts: false

image: /var/lib/libvirt/images/guest.qcow2
file format: qcow2
virtual size: 30G (32212254720 bytes)
disk size: 5.0G
cluster_size: 65536
Format specific information:
    compat: 1.1
    lazy refcounts: false

You can see that intermediate snapshot is gone. This means that
blockcommit can do offline merge but not when using online disk (like we
wanted to).

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https://bugs.launchpad.net/bugs/1317491

Title:
  virsh blockcommit hangs at 100%

Status in libvirt package in Ubuntu:
  Fix Released
Status in libvirt source package in Trusty:
  Fix Committed
Status in libvirt source package in Xenial:
  Fix Released
Status in libvirt source package in Yakkety:
  Fix Released
Status in libvirt source package in Zesty:
  Fix Released

Bug description:
  [Impact]

   * Virsh can't merge snapshots using the Block Commit technique
   * It is only possible to merge base to top image (not the opposite)
   * Combination of libvirt v1.2.2 and QEMU 2 is no good for Block Commit
   * After this fix, virsh won't hang on the opration, will cause an error

  [Test Case]

   * Workaround in Commit #10
   * QEMU is fine in Commit #11
   * Test Case in Commit #12

  [Regression Potential]

   * Block commit (Already broken) would continue not working
   * Its a small fix based on upstream fix (to block this function)

  [Other Info]

  ## Original Case Description

  virsh blockcommit hangs at 100% and nothing happens.

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