[RFC] Delayed logging

[Christoph Hellwig]

On Mon, Mar 15, 2010 at 03:30:00PM +1100, Dave Chinner wrote:
> 	- occasional recovery failure with recovery reading an inode
> 	  buffer that does not contain inodes. Cause unknown, tends
> 	  to be reproduced by xfsqa test 121 semi-reliably. Needs
> 	  further analysis and fixing. May already be fixed with a
> 	  recent fix to commit record synchronisation.

I just saw a corrupted inode buffer during log recovery in 087, even
without the delaylog mount option.  It's however not easily
reproducible.