55 	unsigned	head;	/* Written to by userland or under ring_lock  member
509 	ring->head = ring->tail = 0;  in aio_setup_ring()
929 static void refill_reqs_available(struct kioctx *ctx, unsigned head,  in refill_reqs_available()  argument
935 	head %= ctx->nr_events;  in refill_reqs_available()
936 	if (head <= tail)  in refill_reqs_available()
937 		events_in_ring = tail - head;  in refill_reqs_available()
939 		events_in_ring = ctx->nr_events - (head - tail);  in refill_reqs_available()
963 		unsigned head;  in user_refill_reqs_available()  local
975 		head = ring->head;  in user_refill_reqs_available()
978 		refill_reqs_available(ctx, head, ctx->tail);  in user_refill_reqs_available()
1056 	unsigned tail, pos, head;  in aio_complete()  local
1112 	head = ring->head;  in aio_complete()
1119 		refill_reqs_available(ctx, head, tail);  in aio_complete()
1157 	unsigned head, tail, pos;  in aio_read_events_ring()  local
1172 	head = ring->head;  in aio_read_events_ring()
1182 	pr_debug("h%u t%u m%u\n", head, tail, ctx->nr_events);  in aio_read_events_ring()
1184 	if (head == tail)  in aio_read_events_ring()
1187 	head %= ctx->nr_events;  in aio_read_events_ring()
1195 		avail = (head <= tail ?  tail : ctx->nr_events) - head;  in aio_read_events_ring()
1196 		if (head == tail)  in aio_read_events_ring()
1201 			    ((head + AIO_EVENTS_OFFSET) % AIO_EVENTS_PER_PAGE));  in aio_read_events_ring()
1203 		pos = head + AIO_EVENTS_OFFSET;  in aio_read_events_ring()
1218 		head += avail;  in aio_read_events_ring()
1219 		head %= ctx->nr_events;  in aio_read_events_ring()
1223 	ring->head = head;  in aio_read_events_ring()
1227 	pr_debug("%li  h%u t%u\n", ret, head, tail);  in aio_read_events_ring()