linux-kernel - Re: SMP read() stopping at memory page boundaries

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Message-ID: <Pine.LNX.4.64.0706210121310.3068@twin.jikos.cz>
Date:	Thu, 21 Jun 2007 01:22:34 +0200 (CEST)
From:	Jiri Kosina <jikos@...os.cz>
To:	Timo Sirainen <tss@....fi>
cc:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Ray Lee <ray-lk@...rabbit.org>, linux-kernel@...r.kernel.org
Subject: Re: SMP read() stopping at memory page boundaries

On Wed, 20 Jun 2007, Timo Sirainen wrote:

> > It will occur if you are reading as someone else changes the file size.
> > Use file locking, it exists for a reason ;)
> Annoying extra overhead. Especially with NFS, when nowadays you can't
> even use flock() to create local locks..

It's not only "nowadays", it has been like that for quite a some time.

On the other hand you can use fcntl(F_SETLK) though, which works even 
through NFS (v3).

-- 
Jiri Kosina
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