> I have two simple questions:
>
> - is my reading of the code correct
Yeap!
> - does anyone have removing this on their ToDo for 2.3?
If I understand things correctly, the holdup on making read & write SMP
aware is the lack of locking in the page cache. Stephen has patches to
make the page cache smp/irq safe, and I'm sure those 'll be one of the
first things to be looked at when 2.3 comes along. That way, we'll be
able to get rid of the wonderful 'dd if=/dev/urandom bs=1024k' SMP DOS
attack.
Another [related] big wart that needs a plan of attack, is how to deal
with fget & fput in threads, and that might be a 2.2 item -- thread A does
a big write(), then thread B then does a close() on the fd... Uh-oh. This
is where a rwlock version of a semaphore would be *really* handy.
-ben
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