zfs code - Mar 2009 - Accessing inode generation number from user mode

Is there a way to access the inode generation number from user mode?
If not, is there any other information that could be used to uniquely identify a
file, possibly in combination with the inode?
If this is also not possible, what way would be preferable to store such
information? Just as a named attribute or is there a more efficient way?
I assume my application has full control over the filesystem (no other writers),
so it could generate a unique number along with each file creation. Not exactly
the generation number, but something unique, which is sufficient.

Thanks for any hints.
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