#ifndef _LINUX_ELEVATOR_H
#define _LINUX_ELEVATOR_H
+#include <linux/percpu.h>
+
+#ifdef CONFIG_BLOCK
+
typedef int (elevator_merge_fn) (request_queue_t *, struct request **,
struct bio *);
typedef int (elevator_may_queue_fn) (request_queue_t *, int);
typedef int (elevator_set_req_fn) (request_queue_t *, struct request *, gfp_t);
-typedef void (elevator_put_req_fn) (request_queue_t *, struct request *);
+typedef void (elevator_put_req_fn) (struct request *);
typedef void (elevator_activate_req_fn) (request_queue_t *, struct request *);
typedef void (elevator_deactivate_req_fn) (request_queue_t *, struct request *);
-typedef void *(elevator_init_fn) (request_queue_t *, elevator_t *);
+typedef void *(elevator_init_fn) (request_queue_t *);
typedef void (elevator_exit_fn) (elevator_t *);
struct elevator_ops
{
struct list_head list;
struct elevator_ops ops;
- struct elevator_type *elevator_type;
struct elv_fs_entry *elevator_attrs;
char elevator_name[ELV_NAME_MAX];
struct module *elevator_owner;
INIT_LIST_HEAD(&(rq)->donelist); \
} while (0)
+/*
+ * io context count accounting
+ */
+#define elv_ioc_count_mod(name, __val) \
+ do { \
+ preempt_disable(); \
+ __get_cpu_var(name) += (__val); \
+ preempt_enable(); \
+ } while (0)
+
+#define elv_ioc_count_inc(name) elv_ioc_count_mod(name, 1)
+#define elv_ioc_count_dec(name) elv_ioc_count_mod(name, -1)
+
+#define elv_ioc_count_read(name) \
+({ \
+ unsigned long __val = 0; \
+ int __cpu; \
+ smp_wmb(); \
+ for_each_possible_cpu(__cpu) \
+ __val += per_cpu(name, __cpu); \
+ __val; \
+})
+
+#endif /* CONFIG_BLOCK */
#endif