Hi,

Here is the patch to support ext3 getblocks() for non allocation
cases. (for reads & re-writes). This is useful with DIO reads,
DIO re-writes and to go with Christoph's getblocks() for readpages()
work.

Mingming is working on adding multiblock allocation support using
reservation (which can be incrementally added later).

Comments ? 

Thanks,
Badari