[PATCH] nvme-core: update NS Attr Changed AEN handling for ANA group

[Keith Busch]

On Thu, Jan 14, 2021 at 10:59:09PM +0000, Knight, Frederick wrote:
> Attached is the proposed clarification.  This has had ZERO review time in the NVMe committee.  So just FYI at this point.
> 
> Feel free to share thoughts.

The ECN retains the text that no new ANA event shall be sent if "the
change is due to the creation of a namespace", which seems odd to
continue pointing out given that namespace creation doesn't alter the
ANA log.

Also, if you're going to use this ECN to ensure namespace attachment to
a new ANA group suppresses the ANA event, could you also update section
8.20.3.6 to change: 

  c) upon entry to the following ANA states:

to something like

  c) upon entry to the following ANA states except if the state entry
     occurs as a result of a namespace attachment:

Just so everyone is consistent with the "exceptions".