*** Bug 1789853 has been marked as a duplicate of this bug. ***

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https://bugs.launchpad.net/bugs/1847105

Title:
  very slow disk creation, snapshotting

Status in virt-manager:
  Confirmed
Status in Native ZFS for Linux:
  New
Status in libvirt package in Ubuntu:
  Triaged
Status in virt-manager package in Ubuntu:
  Triaged
Status in zfs-linux package in Ubuntu:
  New
Status in libvirt source package in Bionic:
  Invalid
Status in virt-manager source package in Bionic:
  Invalid
Status in zfs-linux source package in Bionic:
  New
Status in libvirt source package in Disco:
  Triaged
Status in virt-manager source package in Disco:
  Triaged
Status in zfs-linux source package in Disco:
  New

Bug description:
  This is a regression in eoan for me. I use virt-manager to create vms,
  and I noticed that creating one now takes more than a minute.

  Looking at the process listing while the backing disk is being created, I see 
this qemu-img command line:
  15658 ?        Ssl    0:00 /usr/sbin/libvirtd
  23726 ?        Sl     0:04  \_ /usr/bin/qemu-img create -f qcow2 -o 
preallocation=falloc,compat=1.1,lazy_refcounts 
/var/lib/libvirt/images/live-server.qcow2 41943040K

  If I run qemu-img with that preallocation parameter set, even on
  bionic, then it also takes a very long time.

  On eoan, for comparison:
  andreas@nsn7:~$ time qemu-img create -f qcow2 no-prealloc-image.qcow2 40G
  Formatting 'no-prealloc-image.qcow2', fmt=qcow2 size=42949672960 
cluster_size=65536 lazy_refcounts=off refcount_bits=16

  real  0m0,016s
  user  0m0,010s
  sys   0m0,006s
  andreas@nsn7:~$ qemu-img info no-prealloc-image.qcow2 
  image: no-prealloc-image.qcow2
  file format: qcow2
  virtual size: 40G (42949672960 bytes)
  disk size: 17K
  cluster_size: 65536
  Format specific information:
      compat: 1.1
      lazy refcounts: false
      refcount bits: 16
      corrupt: false
  andreas@nsn7:~$ du -hs no-prealloc-image.qcow2 
  17K   no-prealloc-image.qcow2
  andreas@nsn7:~$ 

  
  and now with preallocation=falloc:
  andreas@nsn7:~$ time qemu-img create -f qcow2 -o preallocation=falloc 
with-prealloc-image.qcow2 40G
  Formatting 'with-prealloc-image.qcow2', fmt=qcow2 size=42949672960 
cluster_size=65536 preallocation=falloc lazy_refcounts=off refcount_bits=16

  real  1m43,196s
  user  0m3,564s
  sys   1m26,720s
  andreas@nsn7:~$ qemu-img info with-prealloc-image.qcow2 
  image: with-prealloc-image.qcow2
  file format: qcow2
  virtual size: 40G (42949672960 bytes)
  disk size: 2.7M
  cluster_size: 65536
  Format specific information:
      compat: 1.1
      lazy refcounts: false
      refcount bits: 16
      corrupt: false
  andreas@nsn7:~$ du -hs with-prealloc-image.qcow2 
  2,8M  with-prealloc-image.qcow2
  andreas@nsn7:~$

  ProblemType: Bug
  DistroRelease: Ubuntu 19.10
  Package: libvirt-daemon 5.4.0-0ubuntu5
  ProcVersionSignature: Ubuntu 5.3.0-13.14-generic 5.3.0
  Uname: Linux 5.3.0-13-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.11-0ubuntu7
  Architecture: amd64
  Date: Mon Oct  7 11:36:03 2019
  InstallationDate: Installed on 2019-10-07 (0 days ago)
  InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Beta amd64 (20191006)
  SourcePackage: libvirt
  UpgradeStatus: No upgrade log present (probably fresh install)
  modified.conffile..etc.libvirt.nwfilter.allow-arp.xml: [inaccessible: [Errno 
13] Permission denied: '/etc/libvirt/nwfilter/allow-arp.xml']
  modified.conffile..etc.libvirt.nwfilter.allow-dhcp-server.xml: [inaccessible: 
[Errno 13] Permission denied: '/etc/libvirt/nwfilter/allow-dhcp-server.xml']
  modified.conffile..etc.libvirt.nwfilter.allow-dhcp.xml: [inaccessible: [Errno 
13] Permission denied: '/etc/libvirt/nwfilter/allow-dhcp.xml']
  modified.conffile..etc.libvirt.nwfilter.allow-incoming-ipv4.xml: 
[inaccessible: [Errno 13] Permission denied: 
'/etc/libvirt/nwfilter/allow-incoming-ipv4.xml']
  modified.conffile..etc.libvirt.nwfilter.allow-ipv4.xml: [inaccessible: [Errno 
13] Permission denied: '/etc/libvirt/nwfilter/allow-ipv4.xml']
  modified.conffile..etc.libvirt.nwfilter.clean-traffic-gateway.xml: 
[inaccessible: [Errno 13] Permission denied: 
'/etc/libvirt/nwfilter/clean-traffic-gateway.xml']
  modified.conffile..etc.libvirt.nwfilter.clean-traffic.xml: [inaccessible: 
[Errno 13] Permission denied: '/etc/libvirt/nwfilter/clean-traffic.xml']
  modified.conffile..etc.libvirt.nwfilter.no-arp-ip-spoofing.xml: 
[inaccessible: [Errno 13] Permission denied: 
'/etc/libvirt/nwfilter/no-arp-ip-spoofing.xml']
  modified.conffile..etc.libvirt.nwfilter.no-arp-mac-spoofing.xml: 
[inaccessible: [Errno 13] Permission denied: 
'/etc/libvirt/nwfilter/no-arp-mac-spoofing.xml']
  modified.conffile..etc.libvirt.nwfilter.no-arp-spoofing.xml: [inaccessible: 
[Errno 13] Permission denied: '/etc/libvirt/nwfilter/no-arp-spoofing.xml']
  modified.conffile..etc.libvirt.nwfilter.no-ip-multicast.xml: [inaccessible: 
[Errno 13] Permission denied: '/etc/libvirt/nwfilter/no-ip-multicast.xml']
  modified.conffile..etc.libvirt.nwfilter.no-ip-spoofing.xml: [inaccessible: 
[Errno 13] Permission denied: '/etc/libvirt/nwfilter/no-ip-spoofing.xml']
  modified.conffile..etc.libvirt.nwfilter.no-mac-broadcast.xml: [inaccessible: 
[Errno 13] Permission denied: '/etc/libvirt/nwfilter/no-mac-broadcast.xml']
  modified.conffile..etc.libvirt.nwfilter.no-mac-spoofing.xml: [inaccessible: 
[Errno 13] Permission denied: '/etc/libvirt/nwfilter/no-mac-spoofing.xml']
  modified.conffile..etc.libvirt.nwfilter.no-other-l2-traffic.xml: 
[inaccessible: [Errno 13] Permission denied: 
'/etc/libvirt/nwfilter/no-other-l2-traffic.xml']
  modified.conffile..etc.libvirt.nwfilter.no-other-rarp-traffic.xml: 
[inaccessible: [Errno 13] Permission denied: 
'/etc/libvirt/nwfilter/no-other-rarp-traffic.xml']
  modified.conffile..etc.libvirt.nwfilter.qemu-announce-self-rarp.xml: 
[inaccessible: [Errno 13] Permission denied: 
'/etc/libvirt/nwfilter/qemu-announce-self-rarp.xml']
  modified.conffile..etc.libvirt.nwfilter.qemu-announce-self.xml: 
[inaccessible: [Errno 13] Permission denied: 
'/etc/libvirt/nwfilter/qemu-announce-self.xml']
  modified.conffile..etc.libvirt.qemu.conf: [inaccessible: [Errno 13] 
Permission denied: '/etc/libvirt/qemu.conf']
  modified.conffile..etc.libvirt.qemu.networks.default.xml: [inaccessible: 
[Errno 13] Permission denied: '/etc/libvirt/qemu/networks/default.xml']

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