nvme: expose hostid via sysfs for fabrics controllers
We allow userspace to connect with a custom hostid which is useful for certain use-cases. However there is is no way to tell what is the hostid used to connect to a given controller. Expose this so userspace can correlate controllers based on hostid. Signed-off-by: Sagi Grimberg <sagi@grimberg.me> Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com> Signed-off-by: Keith Busch <kbusch@kernel.org>
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