Re: Newbie questions about DIR_ITEM and DIR_INDEX design

[Sun YangKai <sunk67188@gmail.com>]

> No worries.
> 
> It looks like another factor was the fact that the original version of
> getdents() returned a 32-bit d_off on 32-bit systems - which is okay for
> a monotonic counter within a directory, but no good if you want to avoid
> the birthday paradox.
> 
> So if you were designing Btrfs from scratch today, you might choose just
> to have DIR_ITEM, change its hash length to 64 bits, and disallow hash
> collisions completely.
This is exactly what I'm thinking. I came up to this because I have a quite 
large dir whose size is about 66M on my machine. It works well, but with both 
DIR_ITEM and DIR_INDEX, the size is doubled.
> 
> Mark

Thanks,
Sun Yangkai