Re: [PATCH V4 2/2] blktrace: allow access trace file in lockdown mode

Jens Axboe
2023-04-25T19:12:52Z

On 4/25/23 11:55?AM, Junxiao Bi wrote:
> Any IO folks can help review this patch?
>
> Paul needs a confirm from you that the information blktrace exporting
> to userspace through the relay files are safe, not leaking information
> that userspace shouldn't know in lockdown mode.

I don't know anything about what lockdown is, but in terms of blktrace,
it is a way to trace meta data associated with IO. It'll tell you things
like "task T wants to {read,write} on device D, at offset X, and of size
Y". For passthrough IO, it'll also dump the CDB. There's never any
actual data traced.

--
Jens Axboe