1 /****************************************************************************
2 ****************************************************************************
4 *** This header was automatically generated from a Linux kernel header
5 *** of the same name, to make information necessary for userspace to
6 *** call into the kernel available to libc. It contains only constants,
7 *** structures, and macros generated from the original header, and thus,
8 *** contains no copyrightable information.
10 ****************************************************************************
11 ****************************************************************************/
12 #ifndef _LINUX_ELEVATOR_H
13 #define _LINUX_ELEVATOR_H
15 typedef int (elevator_merge_fn) (request_queue_t *, struct request **,
18 typedef void (elevator_merge_req_fn) (request_queue_t *, struct request *, struct request *);
20 typedef void (elevator_merged_fn) (request_queue_t *, struct request *);
22 typedef int (elevator_dispatch_fn) (request_queue_t *, int);
24 typedef void (elevator_add_req_fn) (request_queue_t *, struct request *);
25 typedef int (elevator_queue_empty_fn) (request_queue_t *);
26 typedef struct request *(elevator_request_list_fn) (request_queue_t *, struct request *);
27 typedef void (elevator_completed_req_fn) (request_queue_t *, struct request *);
28 typedef int (elevator_may_queue_fn) (request_queue_t *, int, struct bio *);
30 typedef int (elevator_set_req_fn) (request_queue_t *, struct request *, struct bio *, gfp_t);
31 typedef void (elevator_put_req_fn) (request_queue_t *, struct request *);
32 typedef void (elevator_activate_req_fn) (request_queue_t *, struct request *);
33 typedef void (elevator_deactivate_req_fn) (request_queue_t *, struct request *);
35 typedef void *(elevator_init_fn) (request_queue_t *, elevator_t *);
36 typedef void (elevator_exit_fn) (elevator_t *);
40 elevator_merge_fn *elevator_merge_fn;
41 elevator_merged_fn *elevator_merged_fn;
42 elevator_merge_req_fn *elevator_merge_req_fn;
44 elevator_dispatch_fn *elevator_dispatch_fn;
45 elevator_add_req_fn *elevator_add_req_fn;
46 elevator_activate_req_fn *elevator_activate_req_fn;
47 elevator_deactivate_req_fn *elevator_deactivate_req_fn;
49 elevator_queue_empty_fn *elevator_queue_empty_fn;
50 elevator_completed_req_fn *elevator_completed_req_fn;
52 elevator_request_list_fn *elevator_former_req_fn;
53 elevator_request_list_fn *elevator_latter_req_fn;
55 elevator_set_req_fn *elevator_set_req_fn;
56 elevator_put_req_fn *elevator_put_req_fn;
58 elevator_may_queue_fn *elevator_may_queue_fn;
60 elevator_init_fn *elevator_init_fn;
61 elevator_exit_fn *elevator_exit_fn;
62 void (*trim)(struct io_context *);
65 #define ELV_NAME_MAX (16)
68 struct attribute attr;
69 ssize_t (*show)(elevator_t *, char *);
70 ssize_t (*store)(elevator_t *, const char *, size_t);
75 struct list_head list;
76 struct elevator_ops ops;
77 struct elevator_type *elevator_type;
78 struct elv_fs_entry *elevator_attrs;
79 char elevator_name[ELV_NAME_MAX];
80 struct module *elevator_owner;
85 struct elevator_ops *ops;
88 struct elevator_type *elevator_type;
89 struct mutex sysfs_lock;
92 #define ELEVATOR_NO_MERGE 0
93 #define ELEVATOR_FRONT_MERGE 1
94 #define ELEVATOR_BACK_MERGE 2
96 #define ELEVATOR_INSERT_FRONT 1
97 #define ELEVATOR_INSERT_BACK 2
98 #define ELEVATOR_INSERT_SORT 3
99 #define ELEVATOR_INSERT_REQUEUE 4
107 #define rq_end_sector(rq) ((rq)->sector + (rq)->nr_sectors)