> -----Original Message-----
> From: Matthew Wilcox <willy@xxxxxxxxxxxxx>
> Sent: Friday, May 28, 2021 8:52 PM
> To: Justin He <Justin.He@xxxxxxx>
> Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>; Petr Mladek
> <pmladek@xxxxxxxx>; Steven Rostedt <rostedt@xxxxxxxxxxx>; Sergey
> Senozhatsky <senozhatsky@xxxxxxxxxxxx>; Andy Shevchenko
> <andriy.shevchenko@xxxxxxxxxxxxxxx>; Rasmus Villemoes
> <linux@xxxxxxxxxxxxxxxxxx>; Jonathan Corbet <corbet@xxxxxxx>; Alexander
> Viro <viro@xxxxxxxxxxxxxxxxxx>; Luca Coelho <luciano.coelho@xxxxxxxxx>;
> Kalle Valo <kvalo@xxxxxxxxxxxxxx>; David S. Miller <davem@xxxxxxxxxxxxx>;
> Jakub Kicinski <kuba@xxxxxxxxxx>; Heiko Carstens <hca@xxxxxxxxxxxxx>;
> Vasily Gorbik <gor@xxxxxxxxxxxxx>; Christian Borntraeger
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> Subject: Re: [PATCH RFCv2 1/3] fs: introduce helper d_path_fast()
>
> On Fri, May 28, 2021 at 07:39:49PM +0800, Jia He wrote:
> > +/**
> > + * d_path_fast - fast return the full path of a dentry without taking
> > + * any seqlock/spinlock. This helper is typical for debugging purpose
> > + */
> > +char *d_path_fast(const struct path *path, char *buf, int buflen)
>
> I'd suggest calling it d_path_unsafe(). Otherwise people will call it
> instead of d_path because who doesn't like fast?
>
Okay, thanks
> > +{
> > + struct path root;
> > + struct mount *mnt = real_mount(path->mnt);
> > + DECLARE_BUFFER(b, buf, buflen);
> > +
> > + rcu_read_lock();
> > + get_fs_root_rcu(current->fs, &root);
> > +
> > + prepend(&b, "", 1);
> > + __prepend_path(path->dentry, mnt, &root, &b);
> > + rcu_read_unlock();
> > +
> > + return extract_string(&b);
> > +}
> > +EXPORT_SYMBOL(d_path_fast);
>
> Why export it? What module needs this?
Okay, indeed
--
Cheers,
Justin (Jia He)
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