On Fri, 14 Apr 2006, Alan Cox wrote:
>
> Quality for whom ? There is a measurable cost to all that extra locking
> which will hurt everyone. Given existing kernels don't make the
> guarantee and SuS v3 does not make the guarantee the apps that need it
> will continue to do the extra work themselves anyway.
True.
> And of course I too would like to know if anyone is hitting O_APPEND
> examples of this problem and if so on what fs ....
Well, Dan already said that he doesn't see it with O_APPEND (aka ">>"),
but yes, other filesystems may not be that lucky.
I'd actually not be surprised if the O_APPEND thing is tested by some of
the FS stress tools, so I suspect all the regular filesystems get it
right. Of course, since most of them - at least the local ones - use the
same generic framework, that's an even safer bet.
NFS etc is very special, of course, especially in the presense of clients
on different machines. At that point, I wouldn't guarantee a whole lot.
Linus
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