Pedro F. Giffuni 43ce40e891 ext2fs: cleanup generation number management.
Ext2/3/4 manages generation numbers differently than UFS so adopt
some rules that should work well. When allocating a new inode,
make sure we generate a "good" random value specifically avoiding
zero.

Don't interfere with the numbers that are already generated in
the filesystem: ext2fs doesn't have the backwards compatibility
issues  where there were no generation numbers.

Reviewed by:	kevlo
MFC after:	1 week
2016-06-07 14:37:43 +00:00
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