Re: [PATCH] block: model freeze & enter queue as rwsem for supporting lockdep

[Christoph Hellwig]

On Tue, Oct 22, 2024 at 09:19:05AM +0200, Peter Zijlstra wrote:
> > Not sure modelling it as a trylock is the right approach here,
> > I've added the lockdep maintainers if they have an idea.
> 
> So lockdep supports recursive reader state, but you're looking at
> recursive exclusive state?

Yes.

> If you achieve this using an external nest count, then it is probably (I
> haven't yet had morning juice) sufficient to use the regular exclusive
> state on the outermost lock / unlock pair and simply ignore the inner
> locks.

There obviosuly is an external nest count here, so I guess that should
do the job.  Ming?