ilookup — search for an inode in the inode cache
super block of file system to search
inode number to search for
ilookup uses ifind_fast to search for the inode ino in the inode cache. This is for file systems where the inode number is sufficient for unique identification of an inode.
If the inode is in the cache, the inode is returned with an incremented reference count.
Otherwise NULL is returned.