changing d_parent

[Jerome de Vivie <jerome.devivie@free.fr>]

I would like to change the "d_parent" field of a dentry. This is for
shrinking entry equivalent to a "./" in my filesystem namespace.

The dentry has just been allocated and has no child. I'm new to the 
dcache and i would like to know if thoses lines are is safe:

    spin_lock(&dcache_lock);
    list_del(&dentry->d_child);
    dput(dentry->d_parent);
    dentry->d_parent = dget(newparent);
    list_add(&dentry->d_child, &newparent->d_subdirs);
    spin_unlock(&dcache_lock);

kind regards,

j.

-- 
Jérôme de Vivie
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