kernfs: define kernfs_node_dentry
Add a new kernfs api is added to lookup the dentry for a particular kernfs path. Signed-off-by: NAditya Kali <adityakali@google.com> Signed-off-by: NSerge E. Hallyn <serge.hallyn@canonical.com> Acked-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: NTejun Heo <tj@kernel.org>
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