On Fri, 27 Mar 2009, Jan Kara wrote:
quoted text
>
>   Doable but not fairly simple ;) Firstly you have to restart a transaction
> when you've used up all the credits you originally started with (easy),
> secondly ext3 uses lock order PageLock -> "transaction start" which is
> unusable for the scheme you suggest. So we'd have to revert that - which
> needs larger audit of our locking scheme and that's probably the reason
> why noone has done it yet.

It's also not clear that ext3 can really do much better than the regular 
generic_writepages() logic. I mean, seriously, what's there to improve on? 
The transaction code is all normally totally pointless, and I merged the 
patch that avoids it when not necessary. 

It might be different if more people used "data=journal", but I don't 
doubt that is very common. For data=writeback and data=ordered, I bet 
generic_writepages() is as good as anything ext3-specific could be.

			Linus
--
unsubscribe notice
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/