fdstream: introduce virFDStreamOpenBlockDevice
virStorageBackendVolDownloadLocal and virStorageBackendVolUploadLocal use virFDStreamOpenFile function to work with the volume fd. virFDStreamOpenFile calls virFDStreamOpenFileInternal that implements handling of the non-blocking I/O. If a file is not a character device and not a fifo, it uses libvirt_iohelper. On FreeBSD, it doesn't work as expected because disk devices (including ZFS volumes) are exposed as character devices, and ZFS volumes do not support open(2) with O_NONBLOCK. To overcome this, introduce a forceIOHelper flag to virFDStreamOpenFileInternal that forces using libvirt_iohelper. And introduce virFDStreamOpenBlockDevice that calls virFDStreamOpenFileInternal with the forceIOHelper set to true.
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