suse man page for d_validate

D_VALIDATE(9)							   The Linux VFS						     D_VALIDATE(9)

NAME
       d_validate - verify dentry provided from insecure source

SYNOPSIS
       int d_validate(struct dentry * dentry, struct dentry * dparent);

ARGUMENTS
       dentry
	   The dentry alleged to be valid child of dparent

       dparent
	   The parent dentry (known to be valid)

DESCRIPTION
       An insecure source has sent us a dentry, here we verify it and dget it. This is used by ncpfs in its readdir implementation. Zero is
       returned in the dentry is invalid.

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