[PATCH 4/4] fs, afs: convert afs_volume.usage from atomic_t to refcount_t

[David Howells]

Elena Reshetova <elena.reshetova at intel.com> wrote:

> refcount_t type and corresponding API should be
> used instead of atomic_t when the variable is used as
> a reference counter. This allows to avoid accidental
> refcounter overflows that might lead to use-after-free
> situations.
> 
> Signed-off-by: Elena Reshetova <elena.reshetova at intel.com>
> Signed-off-by: Hans Liljestrand <ishkamiel at gmail.com>
> Signed-off-by: Kees Cook <keescook at chromium.org>
> Signed-off-by: David Windsor <dwindsor at gmail.com>

This one is fine.

Acked-by: David Howells <dhowells at redhat.com>