iget_locked — obtain an inode from a mounted file system
struct inode * iget_locked (struct super_block * sb, unsigned long ino);
This is iget without the read_inode portion of get_new_inode_fast.
iget_locked uses ifind_fast to search for the inode specified by ino in
the inode cache and if present it is returned with an increased reference
count. This is for file systems where the inode number is sufficient for
unique identification of an inode.
If the inode is not in cache, get_new_inode_fast is called to allocate a
new inode and this is returned locked, hashed, and with the I_NEW flag set.
The file system gets to fill it in before unlocking it via
unlock_new_inode.