Re: [RESEND] [PATCH] VFS: make file->f_pos access atomic on 32bit arch

Nick Piggin
2008-10-08T08:49:25Z

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.