Re: [PATCH 4/7] cxl/mem: Support Sanitation

[Davidlohr Bueso <dave@stgolabs.net>]

On Mon, 27 Mar 2023, Dan Williams wrote:

>Per the feedback on 1 this changes to be a facility that returns
>immediately and signals completion via sysfs_notify_dirent() because if
>it takes seconds and is hardware uninterruptible then that warrants
>userspace being able to poll for completion if it wants.

Perhaps I'm missing something here, but how can we signal completion
for sanitation if we return immediately (after timing out) and loose
context of the background command? Or are you referring to use the
Background Operation Status command (0002h), which afaict would be
the only way to do this, as nvdimm's overwrite_query. But as we've
discussed in the past, this also means that another bg command could
occur in between when the command finished and the query is done.

Thanks,
Davidlohr