[REVIEW] fix mkfs.xfs agcount between 64 and 128MB

["Barry Naujok" <bnaujok@xxxxxxx>]

With the AG count = 4 changes for a single disk, device sizes between 64MB  
and 128MB still scale from 4 to 8 AGs. This is causing some questions!

The attached patch enforces 4 AGs for devices between 64 and 128MB  
(including multi-disk setups, which should be extremely rare at this  
size). This means the AG size will vary from 16 to 32MB depending on the  
device size.

Barry.

fix_agcount_in_mkfs_for_small_sizes.patch
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