Re: [libvirt] [PATCHv9 6/9] blockjob: implement block copy for qemu

Minimal patch to wire up all the pieces in the previous patches to actually enable a block copy job. By minimal, I mean that qemu creates the file (that is, no REUSE_EXT flag support yet), SELinux must be disabled, a lock manager is not informed, and the audit logs aren't updated. But those will be added as improvements in future patches. This patch is designed so that if we ever add a future API virDomainBlockCopy with more bells and whistles (such as letting the user specify a destination image format different than the source), where virDomainBlockRebase is a wrapper around the simpler portions of the new functionality, then the new API can just reuse the new qemuDomainBlockCopy function and already support _SHALLOW and _REUSE_EXT flags. Also note that libvirt.c already filtered the new flags if _COPY is not present, so that we are not impacting the case of BlockRebase being a wrapper around BlockPull. * src/qemu/qemu_driver.c (qemuDomainBlockCopy): New function. (qemuDomainBlockRebase): Call it when appropriate. --- v9: fix bug with driver locking