[RFC v2 2/3] nvme: add error logging opt-in

[Christoph Hellwig]

On Thu, Mar 23, 2023 at 04:03:15PM -0700, Alan Adamson wrote:
> Commit d7ac8dca938c ("nvme: quiet user passthrough command errors") disabled error
> logging for user passthrough commands.  This commit adds the ability to opt-in
> to passthrough error logging.
> 
> To enable passthrough error logging:
>         echo 1 > /sys/kernel/debug/nvme0/error-logging
> 
> To disable passthrough error logging:
>         echo 0 > /sys/kernel/debug/nvme0/error-logging
> 
> By default, passthrough error logging will remain disabled.
> 
> CONFIG_NVME_ERROR_LOGGING_DEBUG_FS needs to be enabled to
> to enable passthrough error logging.

Any reason to do this in debugfs vs sysfs which is someting
that we can a handle too much more easily?

Also why do we need a config option for a trivial mount of code?