blockdev-add fails if an invalid node name is given, so we should
document what a valid node name even is.
Reported-by: Cong Li <coli@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Cong Li <coli@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
# @driver: block driver name
# @node-name: the node name of the new node (Since 2.0).
# This option is required on the top level of blockdev-add.
+# Valid node names start with an alphabetic character and may
+# contain only alphanumeric characters, '-', '.' and '_'. Their
+# maximum length is 31 characters.
# @discard: discard-related options (default: ignore)
# @cache: cache-related options
# @read-only: whether the block device should be read-only (default: false).