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 15 typedef int (elevator_merge_fn) (request_queue_t *, struct request **, 16 struct bio *); 17 18 typedef void (elevator_merge_req_fn) (request_queue_t *, struct request *, struct request *); 19 20 typedef void (elevator_merged_fn) (request_queue_t *, struct request *); 21 22 typedef int (elevator_dispatch_fn) (request_queue_t *, int); 23 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 *); 29 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 *); 34 35 typedef void *(elevator_init_fn) (request_queue_t *, elevator_t *); 36 typedef void (elevator_exit_fn) (elevator_t *); 37 38 struct 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 67 struct 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 73 struct 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 83 struct 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 4 100 101 enum { 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 110
