Re: [PATCH] [RFC v2] xfs: byte range buffer dirty region tracking

[Mark Tinguely <tinguely@xxxxxxx>]

On 05/28/15 21:16, Dave Chinner wrote:
> Discussion:
>
> I think that we will eventually need to track multiple regions - 3
> is probably sufficient - because the nature of directory operations
> are that just about every operation modifies a header in the buffer,
> a tail section in the buffer and then some number of bytes/regions
> in the middle of the buffer.
Nod to the idea.

What made you change from your original idea of using 4 regions to 3 
regions?
--Mark.