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review.blissroms.org / platform_bionic / a799b53f10e5a6fd51fef4436cfb7ec99836a516 / . / libc / kernel / common / linux / elevator.h
blob: 2e79ce989e4d82473b7e30fd2cfc7d7249dcba7c [file] [log] [blame]
The Android Open Source Projecta27d2ba2008-10-21 07:00:00 -0700[diff] [blame]1/****************************************************************************
2 ****************************************************************************
3 ***
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.
9 ***
10 ****************************************************************************
11 ****************************************************************************/
12#ifndef _LINUX_ELEVATOR_H
13#define _LINUX_ELEVATOR_H
14
15typedef int (elevator_merge_fn) (request_queue_t *, struct request **,
16 struct bio *);
17
18typedef void (elevator_merge_req_fn) (request_queue_t *, struct request *, struct request *);
19
20typedef void (elevator_merged_fn) (request_queue_t *, struct request *);
21
22typedef int (elevator_dispatch_fn) (request_queue_t *, int);
23
24typedef void (elevator_add_req_fn) (request_queue_t *, struct request *);
25typedef int (elevator_queue_empty_fn) (request_queue_t *);
26typedef struct request *(elevator_request_list_fn) (request_queue_t *, struct request *);
27typedef void (elevator_completed_req_fn) (request_queue_t *, struct request *);
28typedef int (elevator_may_queue_fn) (request_queue_t *, int, struct bio *);
29
30typedef int (elevator_set_req_fn) (request_queue_t *, struct request *, struct bio *, gfp_t);
31typedef void (elevator_put_req_fn) (request_queue_t *, struct request *);
32typedef void (elevator_activate_req_fn) (request_queue_t *, struct request *);
33typedef void (elevator_deactivate_req_fn) (request_queue_t *, struct request *);
34
35typedef void *(elevator_init_fn) (request_queue_t *, elevator_t *);
36typedef void (elevator_exit_fn) (elevator_t *);
37
38struct elevator_ops
39{
40 elevator_merge_fn *elevator_merge_fn;
41 elevator_merged_fn *elevator_merged_fn;
42 elevator_merge_req_fn *elevator_merge_req_fn;
43
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;
48
49 elevator_queue_empty_fn *elevator_queue_empty_fn;
50 elevator_completed_req_fn *elevator_completed_req_fn;
51
52 elevator_request_list_fn *elevator_former_req_fn;
53 elevator_request_list_fn *elevator_latter_req_fn;
54
55 elevator_set_req_fn *elevator_set_req_fn;
56 elevator_put_req_fn *elevator_put_req_fn;
57
58 elevator_may_queue_fn *elevator_may_queue_fn;
59
60 elevator_init_fn *elevator_init_fn;
61 elevator_exit_fn *elevator_exit_fn;
62 void (*trim)(struct io_context *);
63};
64
65#define ELV_NAME_MAX (16)
66
67struct elv_fs_entry {
68 struct attribute attr;
69 ssize_t (*show)(elevator_t *, char *);
70 ssize_t (*store)(elevator_t *, const char *, size_t);
71};
72
73struct elevator_type
74{
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;
81};
82
83struct elevator_queue
84{
85 struct elevator_ops *ops;
86 void *elevator_data;
87 struct kobject kobj;
88 struct elevator_type *elevator_type;
89 struct mutex sysfs_lock;
90};
91
92#define ELEVATOR_NO_MERGE 0
93#define ELEVATOR_FRONT_MERGE 1
94#define ELEVATOR_BACK_MERGE 2
95
96#define ELEVATOR_INSERT_FRONT 1
97#define ELEVATOR_INSERT_BACK 2
98#define ELEVATOR_INSERT_SORT 3
99#define ELEVATOR_INSERT_REQUEUE 4
100
101enum {
102 ELV_MQUEUE_MAY,
103 ELV_MQUEUE_NO,
104 ELV_MQUEUE_MUST,
105};
106
107#define rq_end_sector(rq) ((rq)->sector + (rq)->nr_sectors)
108
109#endif