linux-kernel - RE: [PATCH RFCv2 1/3] fs: introduce helper d_path

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Date:   Fri, 28 May 2021 14:23:08 +0000
From:   Justin He <Justin.He@....com>
To:     Matthew Wilcox <willy@...radead.org>
CC:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Petr Mladek <pmladek@...e.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Jonathan Corbet <corbet@....net>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Luca Coelho <luciano.coelho@...el.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Johannes Berg <johannes.berg@...el.com>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-s390@...r.kernel.org" <linux-s390@...r.kernel.org>
Subject: RE: [PATCH RFCv2 1/3] fs: introduce helper d_path_fast()



> -----Original Message-----
> From: Matthew Wilcox <willy@...radead.org>
> Sent: Friday, May 28, 2021 8:52 PM
> To: Justin He <Justin.He@....com>
> Cc: Linus Torvalds <torvalds@...ux-foundation.org>; Petr Mladek
> <pmladek@...e.com>; Steven Rostedt <rostedt@...dmis.org>; Sergey
> Senozhatsky <senozhatsky@...omium.org>; Andy Shevchenko
> <andriy.shevchenko@...ux.intel.com>; Rasmus Villemoes
> <linux@...musvillemoes.dk>; Jonathan Corbet <corbet@....net>; Alexander
> Viro <viro@...iv.linux.org.uk>; Luca Coelho <luciano.coelho@...el.com>;
> Kalle Valo <kvalo@...eaurora.org>; David S. Miller <davem@...emloft.net>;
> Jakub Kicinski <kuba@...nel.org>; Heiko Carstens <hca@...ux.ibm.com>;
> Vasily Gorbik <gor@...ux.ibm.com>; Christian Borntraeger
> <borntraeger@...ibm.com>; Johannes Berg <johannes.berg@...el.com>; linux-
> doc@...r.kernel.org; linux-kernel@...r.kernel.org; linux-
> wireless@...r.kernel.org; netdev@...r.kernel.org; linux-
> s390@...r.kernel.org
> 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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