K 10
svn:author
V 3
pfg
K 8
svn:date
V 27
2016-06-07T14:37:43.939174Z
K 7
svn:log
V 462
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

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