GFS2: Use slab for block reservation memory

This patch changes block reservations so it uses slab storage.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
diff --git a/fs/gfs2/util.c b/fs/gfs2/util.c
index 9e7765e..3afc6ac 100644
--- a/fs/gfs2/util.c
+++ b/fs/gfs2/util.c
@@ -25,6 +25,7 @@
 struct kmem_cache *gfs2_bufdata_cachep __read_mostly;
 struct kmem_cache *gfs2_rgrpd_cachep __read_mostly;
 struct kmem_cache *gfs2_quotad_cachep __read_mostly;
+struct kmem_cache *gfs2_rsrv_cachep __read_mostly;
 mempool_t *gfs2_bh_pool __read_mostly;
 
 void gfs2_assert_i(struct gfs2_sbd *sdp)