[PATCH v14 2/2] nvmet: support reservation feature

[Dmitry Bogdanov]

On Fri, Oct 11, 2024 at 10:26:12AM +0800, Guixin Liu wrote:
> 
> This patch implements the reservation feature, including:
>   1. reservation register(register, unregister and replace).
>   2. reservation acquire(acquire, preempt, preempt and abort).
>   3. reservation release(release and clear).
>   4. reservation report.
>   5. set feature and get feature of reservation notify mask.
>   6. get log page of reservation event.
> 
> Not supported:
>   1. persistent reservation through power loss.
> 
> Test cases:
>   Use nvme-cli and fio to test all implemented sub features:
>   1. use nvme resv-register to register host a registrant or
>      unregister or replace a new key.
>   2. use nvme resv-acquire to set host to the holder, and use fio
>      to send read and write io in all reservation type. And also
>      test preempt and "preempt and abort".
>   3. use nvme resv-report to show all registrants and reservation
>      status.
>   4. use nvme resv-release to release all registrants.
>   5. use nvme get-log to get events generated by the preceding
>      operations.
> 
> In addition, make reservation configurable, one can set ns to
> support reservation before enable ns. The default of resv_enable
> is false.
> 
> Signed-off-by: Guixin Liu <kanie at linux.alibaba.com>

Once got, you may(should for reviewers) add Revived-by tag for the
patches. So, please do not forget:

Reviwed-by: Dmitry Bogdanov <d.bogdanov at yadro.com>