Man page 9 : ilookup5_nowait

ilookup5_nowait - search for an inode in the inode cache

struct inode * ilookup5_nowait(struct super_block *  sb , unsigned long  hashval , int (* test ) (struct inode *, void *), void *  data );

sb
    super block of file system to search

hashval
    hash value (usually inode number) to search for

test
    callback used for comparisons between inodes

data
    opaque data pointer to pass to test

Search for the inode specified by hashval and data in the inode cache. If the inode is in the cache, the inode is returned with an incremented reference count.

I_NEW is not waited upon so you have to be very careful what you do with the returned inode. You probably should be using ilookup5 instead.

test is called with the inode_hash_lock held, so canAqt sleep.