Re: PROBLEM: pthread-safety bug in write(2) on Linux 2.6.x

[Nick Piggin]

Andrew Morton wrote:

> OK, there _might_ be a real-world case: threads appending logging
> information to a flat file.  Trivially workable-around with a userspace
> lock, or by switching to stdio (same thing).
>
> Yes, really we should fix it.  But it's not worth adding more overhead to
> do so.  So the fix would involve widespread (but simple) change, to draw
> that f_pos update inside i_mutex.

Didn't Linus explicitly made the decision not to add synchronisation for
writes with the same file?

http://groups.google.com/group/fa.linux.kernel/msg/ef66c762e737bab7?hl=en&;
Is the closest I could find, but I'm sure he said something similar,
specifically about write(2) vs write(2).

--
SUSE Labs, Novell Inc.
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