23 skc_extent_ring_init(struct skc_extent_ring * const ring,  in skc_extent_ring_init()  argument
28   ring->head      = NULL;  in skc_extent_ring_init()
29   ring->last      = NULL;  in skc_extent_ring_init()
31   ring->outer.rw  = (skc_uint2){ 0 };  in skc_extent_ring_init()
32   ring->inner.rw  = (skc_uint2){ 0 };  in skc_extent_ring_init()
36   ring->size.pow2 = size_pow2;  in skc_extent_ring_init()
37   ring->size.mask = size_pow2 - 1;  in skc_extent_ring_init()
38   ring->size.snap = size_snap;  in skc_extent_ring_init()
39   ring->size.elem = size_elem;  in skc_extent_ring_init()
47 skc_extent_ring_rem(struct skc_extent_ring const * const ring)  in skc_extent_ring_rem()  argument
49   return ring->size.pow2 - (ring->outer.writes - ring->outer.reads);  in skc_extent_ring_rem()
53 skc_extent_ring_is_full(struct skc_extent_ring const * const ring)  in skc_extent_ring_is_full()  argument
55   return (ring->outer.writes - ring->outer.reads) == ring->size.pow2;  in skc_extent_ring_is_full()
59 skc_extent_ring_wip_count(struct skc_extent_ring const * const ring)  in skc_extent_ring_wip_count()  argument
61   return ring->outer.writes - ring->inner.reads;  in skc_extent_ring_wip_count()
65 skc_extent_ring_wip_rem(struct skc_extent_ring const * const ring)  in skc_extent_ring_wip_rem()  argument
67   return SKC_MIN_MACRO(skc_extent_ring_rem(ring),ring->size.snap) - skc_extent_ring_wip_count(ring);  in skc_extent_ring_wip_rem()
71 skc_extent_ring_wip_is_full(struct skc_extent_ring const * const ring)  in skc_extent_ring_wip_is_full()  argument
73 …return skc_extent_ring_wip_count(ring) == SKC_MIN_MACRO(skc_extent_ring_rem(ring),ring->size.snap);  in skc_extent_ring_wip_is_full()
77 skc_extent_ring_wip_index_inc(struct skc_extent_ring * const ring)  in skc_extent_ring_wip_index_inc()  argument
79   return ring->outer.writes++ & ring->size.mask;  in skc_extent_ring_wip_index_inc()
87 skc_extent_ring_checkpoint(struct skc_extent_ring * const ring)  in skc_extent_ring_checkpoint()  argument
89   ring->inner.writes = ring->outer.writes;  in skc_extent_ring_checkpoint()
98                            struct skc_extent_ring * const ring)  in skc_extent_ring_snap_alloc()  argument
110   snap->ring    = ring;  in skc_extent_ring_snap_alloc()
114   snap->reads   = ring->inner.reads;  in skc_extent_ring_snap_alloc()
115   snap->writes  = ring->inner.reads = ring->inner.writes;  in skc_extent_ring_snap_alloc()
121   if (ring->head == NULL)  in skc_extent_ring_snap_alloc()
123       ring->head = snap;  in skc_extent_ring_snap_alloc()
124       ring->last = snap;  in skc_extent_ring_snap_alloc()
128       ring->last->next = snap;  in skc_extent_ring_snap_alloc()
129       ring->last       = snap;  in skc_extent_ring_snap_alloc()
150   struct skc_extent_ring      * const ring = snap->ring;  in skc_extent_ring_snap_free()  local
151   struct skc_extent_ring_snap *       curr = ring->head;  in skc_extent_ring_snap_free()
158     ring->outer.reads = curr->writes;  in skc_extent_ring_snap_free()
169         ring->last = NULL;  in skc_extent_ring_snap_free()
177   ring->head = curr;  in skc_extent_ring_snap_free()
193   return snap->reads & snap->ring->size.mask;  in skc_extent_ring_snap_from()
199   return snap->writes & snap->ring->size.mask;  in skc_extent_ring_snap_to()