bfs recover needs too much memory

[pulkomandy]

So, I have a corrupt BFS again...

Recovering needs about 48GB of memory, for a partition about that size. I have a lot of small files there (lots of sourcecode), but still, this is not really acceptable. I have to use a very large swap file in another partition so the recovery process can work (and of course use a 64bit system).

We should investigate how to make bfs_recover use less memory so it is more practical to use it, without having to set up such a large swapfile.