When creating a new FFS file system, the block size will indirectly
affect the largest file size that is allowed by the file system. On the other hand, when creating a snapshot, the snapshot file will appear as it is as big as the file system itself. Hence we will not be able to create a snapshot on large file systems with small block sizes. Add a warning about this, and gives some hints to correct the issue. Reviewed by: mckusick MFC After: 1 week
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