linux-kernel - Re: [PATCH 01/15] Introduce noop

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Message-ID: <20091120171107.GZ21750@bolzano.suse.de>
Date:	Fri, 20 Nov 2009 18:11:07 +0100
From:	Jan Blunck <jblunck@...e.de>
To:	Jamie Lokier <jamie@...reable.org>
Cc:	linux-fsdevel@...r.kernel.org,
	Christoph Hellwig <hch@...radead.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Linux-Kernel Mailinglist <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>, jkacur@...hat.com,
	Arnd Bergmann <arnd@...db.de>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Matthew Wilcox <matthew@....cx>
Subject: Re: [PATCH 01/15] Introduce noop_llseek()

On Fri, Nov 20, Jamie Lokier wrote:

> Jan Blunck wrote:
> > The noop_llseek() is a llseek() operation that filesystems can use that
> > don't want to support seeking (leave the file->f_pos untouched) but still
> > want to let the syscall itself to succeed.
> 
> This is weird behaviour: if you want to allow llseek() to succeed but
> don't really support seeking, why does the device even care about the
> value of file->f_pos?

The device itself does not care about it but it is userspace that is expecting
the seek to succeed. There is a comment in osst that at least there seems to
be a borken version of tar that wants to seek on the device even it that does
not have any effect.

Regards,
	Jan

-- 
Jan Blunck <jblunck@...e.de>
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