ilookup — search for an inode in the inode cache
struct inode * ilookup (struct super_block * sb, unsigned long ino);
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.