Re: [PATCH 1/3] DEBUGFS: Automatically create parents for debugfs files

[Greg KH <greg@kroah.com>]

On Fri, Dec 02, 2011 at 10:43:25AM -0800, Andi Kleen wrote:
> From: Andi Kleen <ak@linux.intel.com>
> 
> Allow passing path names to debugfs_create* and automatically create
> the parents. This makes it much simpler for the caller to create hierarchies.
> 
> The way the reference counts are handled is admittedly a bit ugly.
> 
> There is no way to clean them up currently other than to delete the tree,
> but that doesn't seem like a big problem for debugfs to leave
> behind a few empty directories.

I like this, but some documentation will probably need to be added
somwhere saying that it's now legal to create a debugfs file with
"this/is/a/tree" and have it all be expanded out.

And yes, cleaning up the directories shouldn't be a big issue, but what
if the directory is already there and it tries to be created again?
Shouldn't you do a lookup first and use that dentry if it's there?

thanks,

greg k-h