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Make BlockExportType.iothread an alternate between a single-thread variant 'str' and a multi-threading variant '[str]'. In contrast to the single-thread setting, the multi-threading setting will not change the BDS's context (and so is incompatible with the fixed-iothread setting), but instead just pass a list to the export driver, with which it can do whatever it wants. Currently no export driver supports multi-threading, so they all return an error when receiving such a list. Suggested-by: Kevin Wolf <kwolf@redhat.com> Acked-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Hanna Czenczek <hreitz@redhat.com> Message-ID: <20260309150856.26800-21-hreitz@redhat.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>