[ext2fs][patch] reallocblks

[gnehzuil]

Hi there,

I have implemented reallocblks in ext2fs. I added some structures in 
m_ext2fs to record cluster summary information due to group descriptor 
has not a structure to record these data in disk. So I implemented it in 
memory. The implementation is almost the same to in ffs.

I have done some simple benchmarks with dbench. This patch can improve 
the performance a little.

Best regards,
lz
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