linux-kernel - RE: [PATCH v5 1/4] fs: introduce helper d_path

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Message-ID: <AM6PR08MB4376206454B462E45E72D3DBF7079@AM6PR08MB4376.eurprd08.prod.outlook.com>
Date:   Thu, 24 Jun 2021 02:35:02 +0000
From:   Justin He <Justin.He@....com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
CC:     Petr Mladek <pmladek@...e.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Jonathan Corbet <corbet@....net>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Eric Biggers <ebiggers@...gle.com>,
        "Ahmed S. Darwish" <a.darwish@...utronix.de>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        Matthew Wilcox <willy@...radead.org>,
        Christoph Hellwig <hch@...radead.org>, nd <nd@....com>
Subject: RE: [PATCH v5 1/4] fs: introduce helper d_path_unsafe()

Hi Andy

> -----Original Message-----
> From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> Sent: Wednesday, June 23, 2021 5:07 PM
> To: Justin He <Justin.He@....com>
> Cc: Petr Mladek <pmladek@...e.com>; Steven Rostedt <rostedt@...dmis.org>;
> Sergey Senozhatsky <senozhatsky@...omium.org>; Rasmus Villemoes
> <linux@...musvillemoes.dk>; Jonathan Corbet <corbet@....net>; Alexander
> Viro <viro@...iv.linux.org.uk>; Linus Torvalds <torvalds@...ux-
> foundation.org>; Peter Zijlstra (Intel) <peterz@...radead.org>; Eric
> Biggers <ebiggers@...gle.com>; Ahmed S. Darwish <a.darwish@...utronix.de>;
> linux-doc@...r.kernel.org; linux-kernel@...r.kernel.org; linux-
> fsdevel@...r.kernel.org; Matthew Wilcox <willy@...radead.org>; Christoph
> Hellwig <hch@...radead.org>; nd <nd@....com>
> Subject: Re: [PATCH v5 1/4] fs: introduce helper d_path_unsafe()
> 
> On Wed, Jun 23, 2021 at 02:02:45AM +0000, Justin He wrote:
> > > From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> > > Sent: Tuesday, June 22, 2021 10:37 PM
> > > On Tue, Jun 22, 2021 at 10:06:31PM +0800, Jia He wrote:
> 
> ...
> 
> > > >   * prepend_name - prepend a pathname in front of current buffer
> pointer
> > > > - * @buffer: buffer pointer
> > > > - * @buflen: allocated length of the buffer
> > > > + * @p: prepend buffer which contains buffer pointer and allocated
> length
> > >
> > > >   * @name:   name string and length qstr structure
> > >
> > > Indentation issue btw, can be fixed in the same patch.
> >
> > Okay
> > >
> > > >   *
> > > >   * With RCU path tracing, it may race with d_move(). Use READ_ONCE()
> to
> > >
> > > Shouldn't this be a separate change with corresponding Fixes tag?
> >
> > Sorry, I don't quite understand here.
> > What do you want to fix?
> 
> Kernel doc. The Fixes tag should correspond to the changes that missed the
> update of kernel doc.
Ah, I got your point. 
Actually, this is originated from an unmerged patch [1]

[1] https://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs.git/commit/?h=work.d_path&id=ad08ae586586ea9e2c0228a3d5a083500ea54202

I will ping Al Viro to fix this


--
Cheers,
Justin (Jia He)