[PATCH 1/1] NVMe: Do not take nsid while a passthrough IO command is being issued via a block device file descriptor

[Keith Busch]

On Sun, 25 Jan 2015, Christoph Hellwig wrote:
> On Fri, Jan 23, 2015 at 03:57:06PM -0800, Yan Liu wrote:
>> When a passthrough IO command is issued with a specific block device file descriptor. It should be applied at
>> the namespace which is associated with that block device file descriptor. This patch makes such passthrough
>> command ignore nsid in nvme_passthru_cmd structure. Instead it takes the namespace ID asscoiated with the
>> block device descriptor.
>
> This looks good to me.  If Keith can point to a use case for magic or
> hidden nsids we'll have to find a bypass for them, but this certainly
> is the right short term fix:

'Flush' is the only command from the spec where specifying all namespaces
might be desirable. Otherwise, I can't disclose vendor specific behavior
to gain concensus on operating within spec, silly as this desire may
seem. Why empower the driver to make a feature unreachable?