linux-kernel - Re: [RESEND] [PATCH] VFS: make file->f

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Message-Id: <200810081949.00556.nickpiggin@yahoo.com.au>
Date:	Wed, 8 Oct 2008 19:48:59 +1100
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	Eric Dumazet <dada1@...mosbay.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Hisashi Hifumi <hifumi.hisashi@....ntt.co.jp>,
	torvalds@...ux-foundation.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	"Theodore Ts'o" <tytso@....edu>
Subject: Re: [RESEND] [PATCH] VFS: make file->f_pos access atomic on 32bit arch

On Wednesday 08 October 2008 19:32, Eric Dumazet wrote:

> A far more interesting problem is the "tail -f logfile" problem that raised
> recently in lkml, when file is NFS mounted, where reader can get nul
> bytes... (Subject : blocks of zeros (NULLs) in NFS files in kernels >=
> 2.6.20 )

Not so interesting outside NFS, AFAIKS? It's just a matter of what
semantics NFS chooses to implement... I guess stronger semantics
will tend to be more costly, all else being equal, probably the
reason why they do it that way.

That behaviour does seem a bit surprising, though.
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