[dm-devel] dm-crypt: reexport sysfs of kcryptd workqueue

[Mike Snitzer]

On Wed, Feb 22 2023 at 10:18P -0500,
yangerkun <yangerkun at huaweicloud.com> wrote:

> From: yangerkun <yangerkun at huawei.com>
> 
> 'a2b8b2d97567 ("dm crypt: export sysfs of kcryptd workqueue")' give us
> idea to set specific CPU or limit max_active crypt work. However sysfs
> will report a warnning and fail 'cryptsetup refresh test' since the
> reload will alloc workqueue with same sysfs name, and we temporarily
> revert this feature to fix the problem.
> 
> What we actually should do is give a unique name once we try reload
> table, we can use ida now.

This header needs to be rewritten to deal directly with the fact:
1) Commit 48b0777cd93d (Revert "dm crypt: export sysfs of kcryptd
   workqueue") dealt with what you call "temporarily revert".
2) Great that you fixed it using IDA but you still haven't clearly
   explained the benefit of exposing this sysfs interface (please add
   details on which userspace is consuming it). I suppose you could
   explain by referring to commit a2b8b2d975673 (that was reverted)?

Thanks,
Mike