[libvirt] [PATCH v1 0/2] Fix qcow2 fully allocated filesystem objects.

Wim Ten Have wim.ten.have at oracle.com
Tue Apr 3 14:14:05 UTC 2018

From: Wim ten Have <wim.ten.have at oracle.com>

When tools like virt-install request to create a fully allocated
filesystem object storage by setting the parameter sparse=no, libvirt
doesn't allow that to happen for qcow2 formatted files.

Regardless of its XML instuction request libvirt always targets its
filesystem object storage with preallocation=metadata if format=qcow2
is in effect.  This results in sparse files which could cause problems
since total image storage potentially can overrun actual filesystem
available space.

(NOTE: This is a RESEND holding corrected cover letter and commit
  messages / Subject headers.)

Wim ten Have (2):
  storage: extend preallocation flags support for qemu-img
  tests: add qemu-img test for preallocation=falloc

 include/libvirt/libvirt-storage.h                   |  5 ++++-
 src/storage/storage_util.c                          | 21 +++++++++++++++++----
 .../qcow2-nocapacity-convert-prealloc.argv          |  2 +-
 3 files changed, 22 insertions(+), 6 deletions(-)


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