Re: [PATCH 3/7] nvme: track shared namespaces

Christoph,

Introduce a new struct nvme_ns_head that holds information about an
actual namespace, unlike struct nvme_ns, which only holds the
per-controller namespace information.  For private namespaces there is
a 1:1 relation of the two, but for shared namespaces this lets us
discover all the paths to it.  For now only the identifiers are moved
to the new structure, but most of the information in struct nvme_ns
should eventually move over.

To allow lockless path lookup the list of nvme_ns structures per
nvme_ns_head is protected by SRCU, which requires freeing the nvme_ns
structure through call_srcu.

Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>

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Martin K. Petersen	Oracle Linux Engineering