Re: Use of disowned struct filename after 3c5499fa56f5?

[Dmitry Kadashev <dkadashev@gmail.com>]

On Fri, Nov 06, 2020 at 12:49:05PM +0000, Pavel Begunkov wrote:
> On 06/11/2020 10:08, Dmitry Kadashev wrote:
> > On Thu, Nov 05, 2020 at 08:57:43PM +0000, Pavel Begunkov wrote:
> > That's pretty much what do_unlinkat() does btw. Thanks Pavel for looking
> > into this!
> > 
> > Can I pick your brain some more? do_mkdirat() case is slightly
> > different:
> > 
> > static long do_mkdirat(int dfd, const char __user *pathname, umode_t mode)
> > {
> > 	struct dentry *dentry;
> > 	struct path path;
> > 	int error;
> > 	unsigned int lookup_flags = LOOKUP_DIRECTORY;
> > 
> > retry:
> > 	dentry = user_path_create(dfd, pathname, &path, lookup_flags);
> > 
> > If we just change @pathname to struct filename, then user_path_create
> > can be swapped for filename_create(). But the same problem on retry
> > arises. Is there some more or less "idiomatic" way to solve this?
> 
> I don't think there is, fs guys may have a different opinion but
> sometimes it's hard to get through them.
> 
> I'd take a filename reference before "retry:"

How do I do that? Just `++name.refcnt` or is there a helper function /
better way?

-- 
Dmitry