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Everything the default plugin method implementation can return is allowed, so there is no breakage introduced by this patch. By far the most common drivers will be 'file' and 'host_device', which the default implementation of the plugin method currently uses. Other quite common ones will be 'iscsi' and 'nbd'. There might also be plugins with 'rbd' and it is planned to support QEMU protocol-paths in the default plugin method implementation, where the 'rbd:' protocol will also be supported. Plugin authors are encouraged to request additional drivers and options based on their needs on the pve-devel mailing list. The list just starts out more restrictive, but everything where there is no good reason to not allow could be allowed in the future upon request. Suggested-by: Thomas Lamprecht <t.lamprecht@proxmox.com> Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>