[PATCH 4/4] blk-mq: use blk_queue_enter/exit to protect debugfs file creation

[Christoph Hellwig]

On Mon, Feb 09, 2026 at 10:33:15AM -0700, Keith Busch wrote:
> > This is not clear to me. Why are concurrent queue freezes not allowed
> > while debugfs attributes are created? I don't see any code in debugfs
> > that calls back into the block layer while creating debugfs attributes?
> > Did I perhaps overlook something?
> 
> I had to look up the original commit that introduced the WARN,
> 65d466b629847. The commit message says "Creating new debugfs entries can
> trigger fs reclaim", so that must be the path that enters back into the
> blaock layer request_queue.

Another way to solves this would be to scope all the debugs action
as NOIO context.