diff options
Diffstat (limited to 'include/linux/elevator.h')
| -rw-r--r-- | include/linux/elevator.h | 41 |
1 files changed, 19 insertions, 22 deletions
diff --git a/include/linux/elevator.h b/include/linux/elevator.h index 1d0f7a2ff73..c24f3d7fbf1 100644 --- a/include/linux/elevator.h +++ b/include/linux/elevator.h @@ -5,6 +5,8 @@ #ifdef CONFIG_BLOCK +struct io_cq; + typedef int (elevator_merge_fn) (struct request_queue *, struct request **, struct bio *); @@ -24,6 +26,8 @@ typedef struct request *(elevator_request_list_fn) (struct request_queue *, stru typedef void (elevator_completed_req_fn) (struct request_queue *, struct request *); typedef int (elevator_may_queue_fn) (struct request_queue *, int); +typedef void (elevator_init_icq_fn) (struct io_cq *); +typedef void (elevator_exit_icq_fn) (struct io_cq *); typedef int (elevator_set_req_fn) (struct request_queue *, struct request *, gfp_t); typedef void (elevator_put_req_fn) (struct request *); typedef void (elevator_activate_req_fn) (struct request_queue *, struct request *); @@ -56,6 +60,9 @@ struct elevator_ops elevator_request_list_fn *elevator_former_req_fn; elevator_request_list_fn *elevator_latter_req_fn; + elevator_init_icq_fn *elevator_init_icq_fn; /* see iocontext.h */ + elevator_exit_icq_fn *elevator_exit_icq_fn; /* ditto */ + elevator_set_req_fn *elevator_set_req_fn; elevator_put_req_fn *elevator_put_req_fn; @@ -63,7 +70,6 @@ struct elevator_ops elevator_init_fn *elevator_init_fn; elevator_exit_fn *elevator_exit_fn; - void (*trim)(struct io_context *); }; #define ELV_NAME_MAX (16) @@ -79,11 +85,20 @@ struct elv_fs_entry { */ struct elevator_type { - struct list_head list; + /* managed by elevator core */ + struct kmem_cache *icq_cache; + + /* fields provided by elevator implementation */ struct elevator_ops ops; + size_t icq_size; /* see iocontext.h */ + size_t icq_align; /* ditto */ struct elv_fs_entry *elevator_attrs; char elevator_name[ELV_NAME_MAX]; struct module *elevator_owner; + + /* managed by elevator core */ + char icq_cache_name[ELV_NAME_MAX + 5]; /* elvname + "_io_cq" */ + struct list_head list; }; /* @@ -91,10 +106,9 @@ struct elevator_type */ struct elevator_queue { - struct elevator_ops *ops; + struct elevator_type *type; void *elevator_data; struct kobject kobj; - struct elevator_type *elevator_type; struct mutex sysfs_lock; struct hlist_head *hash; unsigned int registered:1; @@ -129,7 +143,7 @@ extern void elv_drain_elevator(struct request_queue *); /* * io scheduler registration */ -extern void elv_register(struct elevator_type *); +extern int elv_register(struct elevator_type *); extern void elv_unregister(struct elevator_type *); /* @@ -197,22 +211,5 @@ enum { INIT_LIST_HEAD(&(rq)->csd.list); \ } while (0) -/* - * io context count accounting - */ -#define elv_ioc_count_mod(name, __val) this_cpu_add(name, __val) -#define elv_ioc_count_inc(name) this_cpu_inc(name) -#define elv_ioc_count_dec(name) this_cpu_dec(name) - -#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 |