[libvirt] patch: allow disk cache mode to be specified in a domain's xml definition.

[Jim Meyering]

"Daniel P. Berrange" <berrange at redhat.com> wrote:
...
> Further up in this code its already adding cache=off for shared disks.

Probably introduced by me in the merge.

> There's also quite a few code style issues, not following conventions
> of the surrounding code.
>
> Here's a patch which addresses all that, and more importantly adds test
> cases covering all the cache variants QEMU has.
>
>  b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-cache-v1-none.args |    1
>  b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-cache-v1-none.xml  |   29 +++++++
>  b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-cache-v1-wb.args   |    1
>  b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-cache-v1-wb.xml    |   29 +++++++
>  b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-cache-v1-wt.args   |    1
>  b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-cache-v1-wt.xml    |   29 +++++++
>  b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-cache-v2-none.args |    1
>  b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-cache-v2-none.xml  |   29 +++++++
>  b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-cache-v2-wb.args   |    1
>  b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-cache-v2-wb.xml    |   29 +++++++
>  b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-cache-v2-wt.args   |    1
>  b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-cache-v2-wt.xml    |   29 +++++++
>  b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-shared.args        |    1
>  b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-shared.xml         |   30 +++++++

I looked through the incremental changes, and they look ok,
but see that they do introduce new test failures:

   4) qemuxml2argvdata/qemuxml2argv-disk-drive-cache-v1-wb.xml  FAILED
Relax-NG validity error : Extra element devices in interleave /c/libvirt/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-cache-v1-wb.xml:15: element devices: Relax-NG validity error : Element domain failed to validate content /c/libvirt/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-cache-v1-wb.xml fails to validate
...
   6) qemuxml2argvdata/qemuxml2argv-disk-drive-cache-v2-wt.xml  FAILED
Relax-NG validity error : Extra element devices in interleave /c/libvirt/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-cache-v2-wt.xml:15: element devices: Relax-NG validity error : Element domain failed to validate content /c/libvirt/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-cache-v2-wt.xml fails to validate
...
  14) qemuxml2argvdata/qemuxml2argv-disk-drive-cache-v2-none.xml  FAILED
Relax-NG validity error : Extra element devices in interleave /c/libvirt/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-cache-v2-none.xml:15: element devices: Relax-NG validity error : Element domain failed to validate content /c/libvirt/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-cache-v2-none.xml fails to validate
...
^R  17) qemuxml2argvdata/qemuxml2argv-disk-drive-cache-v2-wb.xml  FAILED
Relax-NG validity error : Extra element devices in interleave /c/libvirt/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-cache-v2-wb.xml:15: element devices: Relax-NG validity error : Element domain failed to validate content /c/libvirt/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-cache-v2-wb.xml fails to validate
...
  22) qemuxml2argvdata/qemuxml2argv-disk-drive-cache-v1-none.xml  FAILED
Relax-NG validity error : Extra element devices in interleave /c/libvirt/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-cache-v1-none.xml:15: element devices: Relax-NG validity error : Element domain failed to validate content /c/libvirt/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-cache-v1-none.xml fails to validate
...
  42) qemuxml2argvdata/qemuxml2argv-disk-drive-cache-v1-wt.xml  FAILED
Relax-NG validity error : Extra element devices in interleave /c/libvirt/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-cache-v1-wt.xml:15: element devices: Relax-NG validity error : Element domain failed to validate content /c/libvirt/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-cache-v1-wt.xml fails to validate