Re: [PATCH 3/5] conf: Introduce <metadata_cache> subelement of <disk><driver>

In certain specific cases it might be beneficial to be able to control the metadata caching of storage image format drivers of a hypervisor. Introduce XML machinery to set the maximum size of the metadata cache which will be used by qemu's qcow2 driver. Signed-off-by: Peter Krempa <pkrempa(a)redhat.com&gt; --- docs/formatdomain.rst | 43 ++++++++++++++ docs/schemas/domaincommon.rng | 20 ++++++- src/conf/domain_conf.c | 51 ++++++++++++++-- src/util/virstoragefile.c | 1 + src/util/virstoragefile.h | 2 + .../qemuxml2argvdata/disk-metadata-cache.xml | 46 +++++++++++++++ .../disk-metadata-cache.x86_64-latest.xml | 58 +++++++++++++++++++ tests/qemuxml2xmltest.c | 1 + 8 files changed, 216 insertions(+), 6 deletions(-) create mode 100644 tests/qemuxml2argvdata/disk-metadata-cache.xml create mode 100644 tests/qemuxml2xmloutdata/disk-metadata-cache.x86_64-latest.xml

+ <disk type='file' device='disk'> + <driver name='qemu' type='qcow2' cache='none'/> + <source file='/tmp/QEMUGuest2.img'/> + <backingStore type='file'> + <format type='qcow2'> + <metadata_cache> + <max_size unit='kiB'>1024</max_size> + </metadata_cache>