[RFC] ext2_new_block() behaviour

[Alexander Viro]

        Folks, there is a pretty strange detail of the allocation policy -
if cylinder group has no free blocks past the goal ext2 tries very hard to
avoid allocation in the beginning of the group. I.e. order looks so:

        * goal
        * goal .. (goal+63) & ~63
        * goal .. end of cylinder group
        * cylinder groups past one that contains goal
        * cylinder groups before one that contains goal
        * beginning of cylinder group..goal-1

It looks somewhat fishy. What's the reason for such policy?
                                                        Cheers,
                                                                Al

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