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Unlike Solaris the Linux implementation embeds the inode in the znode, and has no use for a vnode. So while it's true that fragmention of the znode cache may occur it should not be worse than any of the other Linux FS inode caches. Until proven that this is a problem it's just added complexity we don't need.
Native ZFS for Linux! ZFS is an advanced file system and volume manager which was originally developed for Solaris. It has been successfully ported to FreeBSD and now there is a functional Linux ZFS kernel port too. The port currently includes a fully functional and stable SPA, DMU, and ZVOL with a ZFS Posix Layer (ZPL) on the way!
$ ./configure
$ make pkg
Full documentation for building, configuring, and using ZFS can be found at: http://zfsonlinux.org