[PATCH 15/17] nvme: track shared namespaces

[Hannes Reinecke]

On 10/23/2017 04:51 PM, Christoph Hellwig wrote:
> 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.
> 
> Signed-off-by: Christoph Hellwig <hch at lst.de>
> Reviewed-by: Keith Busch <keith.busch at intel.com>
> Reviewed-by: Javier González <javier at cnexlabs.com>
> Reviewed-by: Johannes Thumshirn <jthumshirn at suse.de>
> ---
>  drivers/nvme/host/core.c     | 190 +++++++++++++++++++++++++++++++++++++------
>  drivers/nvme/host/lightnvm.c |  14 ++--
>  drivers/nvme/host/nvme.h     |  21 ++++-
>  3 files changed, 190 insertions(+), 35 deletions(-)
> 
Reviewed-by: Hannes Reinecke <hare at suse.com>

Cheers,

Hannes
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