Re: [PATCH v5 4/4] rust: samples: Add debugfs sample

[Timur Tabi <ttabi@nvidia.com>]

On Wed, 2025-05-14 at 15:32 -0700, Matthew Maurer wrote:
> One further possibility here, which we'd need Greg to weigh in on - we
> could add a method to the debugfs API intended for Rust usage which
> specifically releases a directory or file *without* releasing any
> nested elements. This would mean we could get rid of all the lifetimes
> on directory and file handles. 

I had a conversation with Greg about this topic just the other week.

https://lore.kernel.org/linux-doc/20250429173958.3973958-1-ttabi@nvidia.com/

There are two versions of debugfs_remove:

void debugfs_remove(struct dentry *dentry);
#define debugfs_remove_recursive debugfs_remove

Unfortunately, the direction that we've been going is to get rid of debugfs_remove_recursive() and
have drivers only call debugfs_remove().  

What would solve your problem is doing the opposite: making debugfs_remove() be non-recursive and
require drivers to call debugfs_remove_recursive() if that's what they really want.

Maybe we need debugfs_remove_single()?