On Wed, Feb 07, 2007 at 12:25:50AM -0800, Mingming Cao wrote:

On Wed, 2007-02-07 at 13:18 +0530, Amit K. Arora wrote:

quoted

c) Do I need to put some hack in the filesystem code for above (to
allocate >32 bit physical block numbers) ?

I had a ext3 hack patch before to allow application specify which block
group is the targeted block allocation group,using ioctl command, so to
allocate >32 bit physical block numbers it just set the target block
group beyond 2**(32-15) = 2**17. patch is below..

Thanks for the patch! 

BTW, have you considered
- move the preallocation code in ioctl to a seperate function, and call
that function from ioctl? That way we could easily switch to
posix_falloc later.

OK.

- Test preallocation with mapped IO?

I haven't done that yet. Will test it out too. Thanks!

--
Regards,
Amit Arora