From: Jamie Lokier <jamie@shareable.org>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: "Oliver Neukum" <oliver@neukum.org>,
"Jan Blunck" <jblunck@suse.de>,
linux-fsdevel@vger.kernel.org,
"Linux-Kernel Mailinglist" <linux-kernel@vger.kernel.org>,
"Andrew Morton" <akpm@linux-foundation.org>,
jkacur@redhat.com, "Thomas Gleixner" <tglx@linutronix.de>,
"Arnd Bergmann" <arnd@arndb.de>,
"Christoph Hellwig" <hch@infradead.org>,
"Frédéric Weisbecker" <fweisbec@gmail.com>,
"Alexander Viro" <viro@zeniv.linux.org.uk>
Subject: Re: [PATCH 1/2] BKL: Remove BKL from default_llseek()
Date: Thu, 19 Nov 2009 02:40:08 +0000 [thread overview]
Message-ID: <20091119024008.GB15128@shareable.org> (raw)
In-Reply-To: <20091118181606.1c8caab1@lxorguk.ukuu.org.uk>
Alan Cox wrote:
> O> But nowadays, even that doesn't happen. sys_read() and sys_write()
> > make a copy of f_pos using file_pos_read(), so drivers cannot see the
> > value change during the call - except for their own change.
> >
> > I find myself wondering why the VFS isn't responsible for the position
> > update instead of the driver... Would it be a valid cleanup to move
> > it from the driver to VFS?
>
> And how would you adjust it. Not all devices have a bytes read == offset
> relationship. The VFS doesn't know enough.
That was implicit in my question: Are there any seekable devices where
bytes read != offset delta, and if yes, is that correct behaviour, a
bug, or a silly interface that should go away?
-- Jamie
next prev parent reply other threads:[~2009-11-19 2:40 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-11-18 16:07 [PATCH 1/2] BKL: Remove BKL from default_llseek() Jan Blunck
2009-11-18 16:07 ` [PATCH 2/2] BKL: Update documentation on llseek( \b) Jan Blunck
2009-11-18 17:15 ` [PATCH 1/2] BKL: Remove BKL from default_llseek() Alan Cox
2009-11-18 17:27 ` Jamie Lokier
2009-11-18 17:33 ` Arnd Bergmann
2009-11-18 18:00 ` Alan Cox
2009-11-18 18:06 ` Arnd Bergmann
2009-11-18 18:14 ` Alan Cox
2009-11-18 19:17 ` Arnd Bergmann
2009-11-18 17:35 ` Oliver Neukum
2009-11-18 17:50 ` Jamie Lokier
2009-11-18 18:16 ` Alan Cox
2009-11-19 2:40 ` Jamie Lokier [this message]
2009-11-19 10:13 ` Alan Cox
2009-11-18 17:55 ` Alan Cox
2009-11-18 17:55 ` Jan Blunck
2009-11-18 17:53 ` Jan Blunck
2009-11-18 18:17 ` Alan Cox
2009-11-18 20:02 ` Jan Blunck
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