+ * The information extracted from these options is recorded in
+ * the other parameters which return dynamically-allocated
+ * structures:
+ * ceph_opts
+ * The address of a pointer that will refer to a ceph options
+ * structure. Caller must release the returned pointer using
+ * ceph_destroy_options() when it is no longer needed.
+ * rbd_opts
+ * Address of an rbd options pointer. Fully initialized by
+ * this function; caller must release with kfree().
+ * spec
+ * Address of an rbd image specification pointer. Fully
+ * initialized by this function based on parsed options.
+ * Caller must release with rbd_spec_put().
+ *
+ * The options passed take this form:
+ * <mon_addrs> <options> <pool_name> <image_name> [<snap_id>]
+ * where:
+ * <mon_addrs>
+ * A comma-separated list of one or more monitor addresses.
+ * A monitor address is an ip address, optionally followed
+ * by a port number (separated by a colon).
+ * I.e.: ip1[:port1][,ip2[:port2]...]
+ * <options>
+ * A comma-separated list of ceph and/or rbd options.
+ * <pool_name>
+ * The name of the rados pool containing the rbd image.
+ * <image_name>
+ * The name of the image in that pool to map.
+ * <snap_id>
+ * An optional snapshot id. If provided, the mapping will
+ * present data from the image at the time that snapshot was
+ * created. The image head is used if no snapshot id is
+ * provided. Snapshot mappings are always read-only.