suse man page for d_alloc_root

D_ALLOC_ROOT(9) 						   The Linux VFS						   D_ALLOC_ROOT(9)

NAME
       d_alloc_root - allocate root dentry

SYNOPSIS
       struct dentry * d_alloc_root(struct inode * root_inode);

ARGUMENTS
       root_inode
	   inode to allocate the root for

DESCRIPTION
       Allocate a root ("/") dentry for the inode given. The inode is instantiated and returned.  NULL is returned if there is insufficient memory
       or the inode passed is NULL.

COPYRIGHT
Kernel Hackers Manual 2.6.					     July 2010							   D_ALLOC_ROOT(9)