linux-kernel - Re: 2.6.36: Sound stop working

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Message-ID: <AANLkTikudWaowKOJ0Qxd1hGKcZiQ8PCeJm+pgXBm7Vc2@mail.gmail.com>
Date:	Thu, 12 Aug 2010 14:50:16 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Takashi Iwai <tiwai@...e.de>, Eric Paris <eparis@...hat.com>,
	Al Viro <viro@...iv.linux.org.uk>
Cc:	Jiri Slaby <jirislaby@...il.com>,
	Pekka Enberg <penberg@...nel.org>,
	Thomas Meyer <thomas@...3r.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.36: Sound stop working

On Thu, Aug 12, 2010 at 2:41 PM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> Al, what was the problem that caused you to think that we want to have
> a 'struct file' here? Is it just the fact that some of those fsnotify
> things use that 'path' structure that is embedded in the parent? But
> isn't the simplest fix for that to just _copy_ the "struct path"
> rather than pass the "struct file" around?

Btw, that's exactly what the fsnotify code does seem to do, in
fsnotify_create_event(). So as far as I can tell, it's all ok - we
only use that file->f_path pointer while we hold the file open, and
then we copy it to event->path and increment the counts properly.

Of course, maybe I'm missing some other case where we _don't_ copy the
data, and pass a pointer to a file->f_path around that could get
stale. Or maybe I'm missing some other worry entirely.

But those games with f_count are just disgusting. The path-based thing
seems to be much more straightforward.

                              Linus
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