This is great work.
a) The algorithm which you are using to distribute the root-reserved
blocks across the blockgroups will end up leaving a small number of unused
blocks in every blockgroup. So large files which span multiple
blockgroups will have little gaps in them.
I think it's probably better to just lump all the root-reserved blocks
into as few blockgroups as possible.
Probably these should be the last blockgroups, because those are
nearest the spindle, and hence the slowest. This is by no means always
the case - some disks are backwards, but it seems that most are not. Plus
nearness to the superblock is good.
b) struct ext2_bg_info needs a ____cacheline_aligned_in_smp stuck on it.
c) It looks like EXT2FS_DEBUG broke. Nobody uses that much, but we should
fix and test it sometime.
Be expecting some benchmark numbers. Maybe those 32-ways will be able to run
as fast as my $300 2-way now ;)
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