what is inode for, in FreeBSD or Solaris

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http://unix.stackexchange.com – I know a little about linux kernel. BUt for Freebsd, the "vnode" actually is similar to the "inode" in Linux kernel. And there is a "inode" concept in FreeBSD or Solaris. So my question is: what is "inode" in FreeBSD for? Below is good to read. Thank you. http://hub.opensolaris.org/bin/view/Community+Group+advocacy/solaris-lin... All three operating systems use a data abstraction layer to hide file system implementation details from applications. In all three OSes, you use open, close, read, write, stat, etc. system calls to access files, regardless of the underlying impl (HowTos)