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Originally the storage volume files were opened with O_DSYNC to make sure they were flushed to disk immediately. It turned out that this was extremely slow in some cases, so the O_DSYNC was removed in favor of just calling fsync() after all the data had been written. However, this call to fsync was inside the block that is executed to zero-fill the end of the volume file. In cases where the new volume is copied from an old volume, and they are the same length, this fsync would never take place. Now the fsync is *always* done, unless there is an error (in which case it isn't important, and is most likely inappropriate.
LibVirt : simple API for virtualization
Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.
Daniel Veillard <veillard@redhat.com>