Search for a dentry
struct dentry * d_lookup(const struct dentry * parent, const struct qstr * name);
parent
parent dentry
name
qstr of name we wish to find
dentry, or NULL
d_lookup searches the children of the parent dentry for the name in question. If the dentry is found its reference count is incremented and the dentry is returned. The caller must use dput to free the entry when it has finished using it. NULL is returned if the dentry does not exist.